Tag Archives: dc worm gear

China Hot selling 24V 25W DC Worm Gear Motor High Torque Reduction Gearbox synchromesh gearbox

Product Description

24v 25w DC Worm Gear Motor High Torque Reduction Gearbox

Model:D49D1-24V25W-500RPM

Type dc worm gear motor 
Motor  Diameter  49mm
Voltage 12v 24v 36v 42v 48v 110v 220v
Power ≤25W
Torque ≤8N.M
Speed ≤250RPM
Gear of ratio 56:1 28:1 70:1 
Gear Modulus 70:1 M=0.8
56:1 28:1  M=1
Material of gear Plastic /brass
OEM/ODM Service Accept
Usage Electric clothes rack ,electric height adjustable table ,smart home appliance,vending machine ,coffee machine ,  industrial machine ,auto garage door opener,other electric tools .

HangZhou CHINAMFG Science & Technology Co.,Ltd is a subsidiary of HangZhou CHINAMFG Motor Co.,Ltd.The factory is located in Xihu (West Lake) Dis.,HangZhou,we can design and  manufacture of motors according to all our customers’ demands so far,we can manufacture about 60,000 motors per month.

Our main market:

Europe,America and Asia, including  UnitedKingdom, Germany, Italy, France, Sweden, United State,Brazil,India,Korea and so on.

Company Advantages:

  1. Big production capacity, fast delivery.

  2. Strict QC inspecting rules: all products must be 100% inspected before delivery.

  3. OEM/ODM services are available

 4. 24 hours online service.

 5. Prompt quotation for your inquiry

  6. Quality,reliability and long product life.

  7. Professional manufacturer offers competitive price.

  8. Diversified rich experienced skilled workers.

More Applications:

Car simulator ,garage door opener ,gate operator, wheelchair ,electric vehicle ,water pump ,oil pump,smart electric-drive curtain,lift gate,glass lifter,floor polisher, office intelligent equipment,sewing machine,vending machine,blender machine,truck lift,stair lift,hospital bed ,hydraulic pump electric forklift.

RFQ:

Q: Are you trading company or manufacturer ?

A: We are Integration of industry and trade, with over 20 years experience in DC worm gear motor. Our company have accumulated skilled production line, complete management and powerful research support, which could match all of the customers’ requirements and make them satisfaction.
 

Q: What is your main product?

DC Motor: Gear motor, Square motor, Stepped motor, and Micro motor
-Welding equipment: Wire feeder, Welding rod, Welding Torch, Earth clamp, Electrode holder, and Rectifier
 

Q: What if I don’t know which DC motor I need?

A: Don’t worry, Send as much information as you can, our team will help you find the right 1 you are looking for.
 

Q: What is your terms of payment ?

A: Payment=1000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact us as below:
 

Q: How to delivery:

A: By sea – Buyer appoint forwarder, or our sales team find suitable forwarder for buyers. 

By air – Buyer offer collect express account, or our sales team find suitable express for buyers. (Mostly for sample)

Others – Actually,samples send by DHL,UPS, TNT and Fedex etc. We arrange to delivery goods to some place from China appointed by buyers.

Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

 

Application: Universal, Industrial, Household Appliances, Power Tools, Automatic Lifting Machine
Operating Speed: Low Speed
Excitation Mode: Permanent Magnet Motor
Samples:
US$ 150/Piece
1 Piece(Min.Order)

|

Order Sample

Sample fee will be returned when order reaches 200
Customization:
Available

|

Customized Request

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Shipping Cost:

Estimated freight per unit.







about shipping cost and estimated delivery time.
Payment Method:







 

Initial Payment



Full Payment
Currency: US$
Return&refunds: You can apply for a refund up to 30 days after receipt of the products.

gearbox

How to Choose the Right Gearbox for Your Machinery

Selecting the appropriate gearbox for your machinery involves careful consideration of several key factors. Here’s a step-by-step guide to help you make the right choice:

  1. Identify Application Requirements: Understand the specific requirements of your machinery, including torque, speed, load, direction of rotation, and duty cycle.
  2. Choose Gear Type: Determine the type of gears that best suit your needs, such as spur, helical, bevel, planetary, or others, based on factors like efficiency, noise level, and space constraints.
  3. Calculate Gear Ratio: Calculate the required gear ratio to achieve the desired output speed and torque. Consider factors like input and output shaft speeds.
  4. Select Gear Material: Choose appropriate gear materials based on factors like durability, wear resistance, and corrosion resistance. Common materials include steel, cast iron, and various alloys.
  5. Consider Efficiency: Evaluate the gearbox’s efficiency and select one that meets your energy efficiency requirements.
  6. Account for Load Conditions: Analyze the load conditions, such as constant or intermittent loads, shock loads, and starting and stopping frequencies.
  7. Check Lubrication Requirements: Consider the lubrication needs of the gearbox and ensure proper lubrication for smooth operation and longevity.
  8. Factor in Space Constraints: Consider the available space for installing the gearbox and choose a size that fits within your machinery.
  9. Assess Environmental Conditions: Evaluate the operating environment, including temperature, humidity, and exposure to dust or corrosive substances.
  10. Review Mounting Options: Determine the mounting options that work best for your machinery, such as foot-mounted, flange-mounted, or shaft-mounted gearboxes.
  11. Consult with Experts: Seek advice from gearbox manufacturers or engineers to ensure you make an informed decision.

Choosing the right gearbox is crucial for achieving optimal machinery performance, longevity, and reliability.

China Hot selling 24V 25W DC Worm Gear Motor High Torque Reduction Gearbox   synchromesh gearbox	China Hot selling 24V 25W DC Worm Gear Motor High Torque Reduction Gearbox   synchromesh gearbox
editor by CX 2023-10-27

China Best Sales Glider Cabinet Drive System 24V DC Micro Worm Gear Motor 120rpm 1nm Worm Gear Motor Actuator for Cabinets, Display Cabinets with Best Sales

Product Description

Glider Cabinet Drive System

above specifications just for reference and customizable according to requirements.
 

product details show:

To solve this problem, we try to add an intelligent self-locking function to the circuit breaker controller of the electronic meter. Taking into account that the internal space of the smart controller of the electric meter is relatively small, the gear motor should drive the stable operation of the loop control system in a limited space, and it is only allowed to rotate in the specified direction and cannot go backwards. We use 10mm planetary gearheads and turbine inserts to be injected into the loop controller gearbox, so that the transmission structure has the characteristics of small size, large torque and can meet the needs of self-locking function. The loop controller gearbox in this scheme can realize the reverse self-locking of the electric meter, which can only transmit the power of the active end of the motor without responding to the external load, thereby isolating the external load from the smart meter’s own mechanism. In case of possible damage, the smart meter can be stopped at the gear motor (also called the gear motor of the loop controller) to increase the service life of the smart meter, solve the problem of data loss when the power is suddenly cut off, and protect the safety of the data.

Application

Smart wearable devices   watch,VR,AR,XR and etc.
Household application kitchen appliances, sewing machines, corn popper, vacuum cleaner, garden tool, sanitary ware, window curtain, intelligent closestool, sweeping robot, power seat, standing desk, electric sofa, TV, computer, treadmill, spyhole, cooker hood, electric drawer, electric mosquito net, intelligent cupboard, intelligent wardrobe, automatic soap dispenser, UV baby bottle sterilizer, lifting hot pot cookware, dishwasher, washing machine, food breaking machine, dryer, air conditioning, dustbin, coffee machine, whisk,smart lock,bread maker,Window cleaning robot and etc.
communication equipment 5G base station,video conference,mobile phone and etc.
Office automation equipments   scanners, printers, multifunction machines copy machines, fax (FAX paper cutter), computer peripheral, bank machine,  screen, lifting socket,  display,notebook PC and etc.
Automotive products  conditioning damper actuator, car DVD,door lock actuator, retractable rearview mirror, meters, optic axis control device, head light beam level adjuster, car water pump, car antenna, lumbar support, EPB, car tail gate electric putter, HUD, head-up display, vehicle sunroof, EPS, AGS, car window, head restraint, E-booster, car seat, vehicle charging station and etc.
Toys and models  radio control model, automatic cruise control, ride-on toy, educational robot, programming robot, medical robot, automatic feeder, intelligent building blocks, escort robot and etc.
Medical equipments  blood pressure meter, breath machine, medical cleaning pump, medical bed, blood pressure monitors, medical ventilator, surgical staplers, infusion pump, dental instrument, self-clotting cutter, wound cleaning pump for orthopedic surgery,electronic cigarette, eyebrow pencil,fascia gun, , surgical robot,laboratory automation and etc.
Industrials   flow control valves, seismic testing,automatic reclosing,Agricultural unmanned aerial vehicle,automatic feeder ,intelligent express cabinet and etc.
Electric power tools  electric drill, screwdriver,garden tool and etc.
Precision instruments  optics instruments,automatic vending machine, wire-stripping machine and etc.
Personal care tooth brush, hair clipper, electric shaver, massager, vibrator, hair dryer, rubdown machine, scissor hair machine, foot grinder,anti-myopia pen, facial beauty equipment, hair curler,Electric threading knife,POWER PERFECT PORE, Puff machine,eyebrow tweezers and etc.
Consumer electronics camera, mobile phone,digital camera, automatic retracting device,camcorder,  kinescope DVD,headphone stereo, cassette tape recorder, bluetooth earbud charging case, turntable, tablet,UAV(unmanned aerial vehicle),surveillance camera,PTZ camera, rotating smart speaker and etc.
robots educational robot, programming robot, medical robot, escort robot and etc.

Our Services:

  • ODM & OEM
  • Gearbox design and development
  • Related technology support

Packaging & Shipping

1) Packing Details

packed in nylon firstly, then carton, and then reinforced with wooden case for outer packing.
Or according to client’s requirement.

2) Shipping Details

samples will be shipped within 10 days;
batch order leading time according to the actual situation.

Company Information:

HangZhou CHINAMFG Machinery & Electronics Co., Ltd was established in 2001,We provide the total drive solution for customers from design, tooling fabrication, components manufacturing and assembly. 

 

1) Competitive Advantages

  • 1) Competitive Advantages
    17+year experience in manufacturing motor gearbox
    We provide technical support from r&d, prototype, testing, assembly and serial production , ODM &OEM
    Competitive Price
    Product Performance: Low noise, High efficiency, Long lifespan
    Prompt Delivery: 15 working days after payment
    Small Orders Accepted

 2) Main Products

  • Precision reduction gearbox and its diameter:3.4mm-38mm,voltage:1.5-24V,power: 0.01-40W,output speed:5-2000rpm and output torque:1.0 gf.cm -50kgf.cm,

  • Customized worm and gear transmission machinery;
  • Precise electromechanical motion module;
  • Precise component and assembly of plastic and metal powder injection.

Certifications

We Have passed to hold ISO9001:2015(CN11/3571),ISO14001:2004(U006616E0153R3M), ISO13485:2016(CN18/42018) and IATF16949:2016(CN11/3571.01).

and more…
 

FAQ

1. Can you make the gearbox with custom specifications?
YES. We have design and development team, also a great term of engineers, each of them have
many work years experience.

2.Do you provide the samples?
YES. Our company can provide the samples to you, and the delivery time is about 5-15days according to the specification of gearbox you need.

3.What is your MOQ?
Our MOQ is 2000pcs. But at the beginning of our business, we accept small order.

4. Do you have the item in stock?
I am sorry we donot have the item in stock, All products are made with orders.

5. Do you provide technology support?
YES. Our company have design and development team, we can provide technology support if you
need.

6.How to ship to us?
We will ship the goods to you according to the DHL or UPS or FEDEX etc account you provide. 

7.How to pay the money?
We accept T/T in advance. Also we have different bank account for receiving money, like US dollors or RMB etc.

8. How can I know the product is suitable for me?
Frist, you need to provide us the more details information about the product. We will recommend the item to you according to your requirement of specification. After you confirm, we will prepare the samples to you. also we will offer some good advances according to your product use.

9. Can I come to your company to visit?
YES, you can come to our company to visit at anytime, and welcome to visit our company.

10. How do contact us ?
 Please send an inquiry 

Application: Universal, Industrial, Household Appliances, Car, Power Tools
Operating Speed: Constant Speed
Excitation Mode: Compound
Function: Control, Driving
Casing Protection: Open Type
Number of Poles: 12
Customization:
Available

|

Customized Request

gearbox

Benefits of Regular Gearbox Maintenance

Regular maintenance of gearboxes offers numerous advantages:

  • Extended Lifespan: Proper maintenance helps prevent premature wear and breakdown, increasing the gearbox’s overall lifespan.
  • Reduced Downtime: Regular inspections and maintenance can identify issues early, minimizing unplanned downtime for repairs.
  • Improved Efficiency: Well-maintained gearboxes operate more efficiently, leading to energy savings and optimized performance.
  • Cost Savings: Routine maintenance reduces the need for costly major repairs or replacements.
  • Enhanced Safety: Regular maintenance ensures safe operation by addressing potential hazards and malfunctions.
  • Optimal Performance: Properly maintained gearboxes deliver consistent and reliable performance for machinery and equipment.
  • Preserved Functionality: Maintenance prevents issues that could lead to reduced functionality or complete failure.
  • Reduced Environmental Impact: Well-maintained gearboxes consume less energy and minimize waste, contributing to sustainability efforts.
  • Compliance: Regular maintenance helps meet industry regulations and standards for equipment safety and performance.

Implementing a proactive maintenance plan can provide these benefits and contribute to the overall success of your machinery and operations.

China Best Sales Glider Cabinet Drive System 24V DC Micro Worm Gear Motor 120rpm 1nm Worm Gear Motor Actuator for Cabinets, Display Cabinets   with Best Sales China Best Sales Glider Cabinet Drive System 24V DC Micro Worm Gear Motor 120rpm 1nm Worm Gear Motor Actuator for Cabinets, Display Cabinets   with Best Sales
editor by CX 2023-09-28

China Good quality Gearbox with Permanent Magnet Micro DC Worm Gear Motor with Good quality

Product Description

Quiet stable and reliable for long life operation

Motor type 63ZYT-125-24
Protection grade IP50
Duty cycle S1 (100%)
Rated voltage 24 V
Rated current 4.9  A
Input power 117.6 W
No-load current 0.4 A
Rated torque 0.27 Nm
Rated speed 3300 ±10% rpm
Rated output power 93.3 W
Friction torque 2 Ncm
efficiency 80%
Maximum torque 1.3 ±10% Nm
Maximum current 23 A
No-load speed 3650 ±10% rpm
Maximum power 245 W
Maximum shell temperature 85 ºC
Weight 1.7 Kg
     
Planetary gear box F1130
Protection grade IP65
Reduction ratio 710.5:1
Rated torque 120 Nm
Maximum torque 180 Nm
Ambient temperature -20 to 85 ºC
Grease Smart Smart top 28
Grease temperature range -20 to 160 ºC

Function: Control, Driving
Casing Protection: Protection Type
Number of Poles: 8
Certification: ISO9001, CCC, CE
Brand: Jintian
Maximum Current: 23
Samples:
US$ 162/Piece
1 Piece(Min.Order)

|
Request Sample

Customization:
Available

|

Customized Request

gearbox

Benefits of Regular Gearbox Maintenance

Regular maintenance of gearboxes offers numerous advantages:

  • Extended Lifespan: Proper maintenance helps prevent premature wear and breakdown, increasing the gearbox’s overall lifespan.
  • Reduced Downtime: Regular inspections and maintenance can identify issues early, minimizing unplanned downtime for repairs.
  • Improved Efficiency: Well-maintained gearboxes operate more efficiently, leading to energy savings and optimized performance.
  • Cost Savings: Routine maintenance reduces the need for costly major repairs or replacements.
  • Enhanced Safety: Regular maintenance ensures safe operation by addressing potential hazards and malfunctions.
  • Optimal Performance: Properly maintained gearboxes deliver consistent and reliable performance for machinery and equipment.
  • Preserved Functionality: Maintenance prevents issues that could lead to reduced functionality or complete failure.
  • Reduced Environmental Impact: Well-maintained gearboxes consume less energy and minimize waste, contributing to sustainability efforts.
  • Compliance: Regular maintenance helps meet industry regulations and standards for equipment safety and performance.

Implementing a proactive maintenance plan can provide these benefits and contribute to the overall success of your machinery and operations.

China Good quality Gearbox with Permanent Magnet Micro DC Worm Gear Motor   with Good quality China Good quality Gearbox with Permanent Magnet Micro DC Worm Gear Motor   with Good quality
editor by CX 2023-09-27

in San Francisco United States sales price shop near me near me shop factory supplier DC Worm Gear Motor manufacturer best Cost Custom Cheap wholesaler

  in San Francisco United States  sales   price   shop   near me   near me shop   factory   supplier DC Worm Gear Motor  manufacturer   best   Cost   Custom   Cheap   wholesaler

Keeping in thoughts that great provider is the important to cooperating with clients, we attempt to satisfy substantial high quality standards, offer competitive prices and make sure prompt shipping. Thanks to our sincerity in providing best service to our clientele, comprehending of your needs and overriding feeling of responsibility toward filling purchasing needs, Our products are used in numerous fields. EPTT information

EPTT diecasting EPTT
Rolled steel housing design
Developed-in EMC components
Corridor sensor feedback offered
A variety of output shaft extension

Specs

EPT

Other EPT ratio is avaiable at EPTT generation.

  in San Francisco United States  sales   price   shop   near me   near me shop   factory   supplier DC Worm Gear Motor  manufacturer   best   Cost   Custom   Cheap   wholesaler

  in San Francisco United States  sales   price   shop   near me   near me shop   factory   supplier DC Worm Gear Motor  manufacturer   best   Cost   Custom   Cheap   wholesaler

in Taizhong China, Taiwan Province of China sales price shop near me near me shop factory supplier 12V Micro DC Worm Gear Motor for Machine manufacturer best Cost Custom Cheap wholesaler

  in Taizhong China, Taiwan Province of China  sales   price   shop   near me   near me shop   factory   supplier 12V Micro DC Worm Gear Motor for Machine  manufacturer   best   Cost   Custom   Cheap   wholesaler

PersonnelOur revenue folks are effectively trained to accommodate your requests and speak English for your ease. “We are always serving our consumers with our very best merchandise.” High quality and credit history are the bases that make a corporation alive. 12V Micro DC Worm Equipment EPTT for EPTT (63ZYT125)

one.Merchandise Description
We can provide numerous designs worm EPTT motor. From 20w-1000w. And the motors can be used in automobile door, elevate technique and other EPTT. We can layout in accordance to your speical necessity.

one. Fit for EPTTs that shaft from EPTT spot ninety deg To the motor.
2. EPTT velocity can be altered in accordance to customer’s need.
three. Our motors can have encoder, brake, thermal protector, electromagnetic brake.
EPTT EPTT Information

Design

Rated
Voltage
(V)
Rated
Present
(A)
Single motor Deceleration motor
Torque
(Nm)
Velocity
(rpm)
EPTT
(W)
Torque
(Nm)
Pace
(rpm)
EPTT
(W)
63ZYT12-40-1 12 5 one hundred thirty 3000 plusmn10% forty two.3 83 plusmn10% twenty
63ZYT12-eighty five-one 12 11 240 3400 plusmn10% 85 four.three ninety four plusmn10% 43
63ZYT24-forty-one 24 two.five one hundred thirty 3000 plusmn10% forty 2.3 83 plusmn10% twenty
63ZYT24-eighty five-one 24 5.5 240 3400 plusmn10% eighty five four.three ninety four plusmn10% 43
63ZYT30-one hundred-one thirty five 280 3000 plusmn10% a hundred two.1 200 plusmn10% 50
63ZYT60-100-1 sixty 2.five 280 3000 plusmn10% one hundred 1 430 plusmn10% 50

The technical specs can be made in accordance to the customer’s prerequisite !
2.Creation Circulation

3.Company Info

In latest 10 many years, EPTTry has been devoted to the manufacture of the motor products and the principal items can be categorized into the subsequent series, specifically DC motor, DC EPTT motor, AC motor, AC EPTT motor, Stepper motor, Stepper EPTT motor, Servo motor and EPTT actuator collection.

Our motor products are commonly applied in the fields of aerospace market, automotive business, finXiHu (West Lake) Dis.Hu (West Lake) Dis.al equipment, EPTT EPTT, EPTT EPTT and robotics, healthcare gear, business office tools, EPTT EPTTry and EPTT business, offering clients reputable tailor-made solutions for driving and controlling.

four.Our Solutions

one). EPTT Service:

Swift Reply

All enquiry or e-mail be replied in 12 hrs, no delay for your enterprise.

Professional Staff

Concerns about goods will be replied professionally, precisely, greatest advice to you.

Limited EPTT time

Sample or little orEPTTsent in seven-15 times, bulk or EPT orEPTTabout 30 times.

Payment Decision

T/T, Western EPT,, L/C, and many others, simple for your enterprise.

Prior to shipment

EPTTke images, send to clients for confirmation. Only confirmed, can be delivered out.

Language Option

In addition to EPTT, you can use your very own language by email, then we can translate it.

two). Customization Provider:

EPTT specification(no-load velocity , voltage, torque , diameter, noise, existence, screening) and shaft duration can be tailor-manufactured according to customer’s needs.

five.Bundle amp EPTT

  in Taizhong China, Taiwan Province of China  sales   price   shop   near me   near me shop   factory   supplier 12V Micro DC Worm Gear Motor for Machine  manufacturer   best   Cost   Custom   Cheap   wholesaler

  in Taizhong China, Taiwan Province of China  sales   price   shop   near me   near me shop   factory   supplier 12V Micro DC Worm Gear Motor for Machine  manufacturer   best   Cost   Custom   Cheap   wholesaler

in Vadodara India sales price shop near me near me shop factory supplier 12V 180W Low Speed DC Worm Gear Motor for Food Machinery manufacturer best Cost Custom Cheap wholesaler

  in Vadodara India  sales   price   shop   near me   near me shop   factory   supplier 12V 180W Low Speed DC Worm Gear Motor for Food Machinery manufacturer   best   Cost   Custom   Cheap   wholesaler

we offer you a single-end answer for the obtain of mechanical electrical power transmission items in China. EPG has been effectively accredited by ISO9002 Good quality Administration System, ISO9001 High quality Administration System, API certificate, ISO/TS16949:2002 and ISO10012 measurement administration method. “We are always serving our customers with our greatest merchandise.” 12V 180W dc worm EPTT motor

1.EPTT technical specs:

We can give several models of worm EPTT motor. Worm EPTT EPTT from 20w-1000w. And the motors can be employed in auto doorway, raise method and other EPTT. We can design and style according to your speical need.

Model Votage Velocity Ratio EPTT
90ZYT101-RV030 12V 2000RPM 50:one 180W

two.Production Flow

3.Firm Information

In recent ten years, EPTTRY has been focused to the manufacture of the motor products and the major items can be labeled into the following series, namely DC motor, DC EPTT motor, AC motor, AC EPTT motor, Stepper motor, Stepper EPTT motor, Servo motor and EPTT actuator series.

Our motor products are widely utilized in the fields of aerospace sector, automotive business, finXiHu (West Lake) Dis.Hu (West Lake) Dis.al products, EPTT EPTT, EPTT EPTT and robotics, health-related gear, place of work products, EPTT EPTTry and EPTT industry, providing clients reputable tailor-made options for driving and managing.

4.Our Providers

1). EPTT Service:

Fast Reply

All enquiry or e-mail be replied in twelve hrs, no hold off for your organization.

Skilled Group

Queries about merchandise will be replied professionally, precisely, very best tips to you.

Quick EPTT time

Sample or little orEPTTsent in 7-15 days, bulk or EPT orEPTTabout 30 days.

Payment Decision

T/T, Western EPT,, L/C, etc, effortless for your organization.

Before cargo

EPTTke pictures, send to clients for confirmation. Only confirmed, can be delivered out.

Language Choice

Aside from EPTT, you can use your own language by email, then we can translate it.

two). Customization Support:

EPTT specification(no-load velocity , voltage, torque , diameter, sounds, life, testing) and shaft size can be tailor-created in accordance to customer’s demands.

5.Package amp EPTT

6.Make contact with Info
Rachel Ye
————————————-

HangEPTT EPTTry E ampM Tech. Co., Ltd.

Site: https://derrymotor.en.created-in-china.com/

  in Vadodara India  sales   price   shop   near me   near me shop   factory   supplier 12V 180W Low Speed DC Worm Gear Motor for Food Machinery manufacturer   best   Cost   Custom   Cheap   wholesaler

  in Vadodara India  sales   price   shop   near me   near me shop   factory   supplier 12V 180W Low Speed DC Worm Gear Motor for Food Machinery manufacturer   best   Cost   Custom   Cheap   wholesaler