Product Description

50kw 68hp hydrostatic tractor 920 with telescopic boom front loader 

General introduction:

STEEL CZPT M912 telescopic wheel loader is a new design to the market which besides the normal function of loaders, also have rear output and 3 point hitch for attachments to be used at the rear end, thus it can be used as both a loader and a tractor.
 
Compared with other Chinese wheel loaders, STEEL CAMEL loader is more compact size, better mobility in very tight space and narrow indoors.

With Perkins/Yanmar/Kohler engine, 4 independent hydraulic wheel motors, flexible articulation, STEEL CAMEL loader is powerful and better through capacity on all rough tarrain.

Multifunction working device:

1.Telescopic boom with 3900mm reach

2.Big hydraulic auluary for attachments, 50l/min, or 100L/min, 2 gears meet different work requirement.

3. Electrical output for some special attachments

4.  Hydraulic quick coupling for easy changing attachments

5. Boom floating and self levering

Loader technical data:

There's 3 different models of STEEL CZPT M900 series mini telescopic loader, all have same features and design, just differs in sizes, details as below: 

Model	M910		M915		M920
Dimension with cabin (LxWxH)	2690x1300x2285mm		3400x1500x2300mm		3650x1500x2350mm
Max.lifting height (boom retract)	2512mm		3000mm		3200mm
Max.lifting height (boom extend)	3030mm		3562mm		3900mm
Pulling force	12kN		18kN		19kN
Bucket capacity	0.5cbm		0.8cbm		1 cbm
Max. loading capacity	1000kg		1500kg		2000kg
Min. turning radius	2120mm		2800mm		3100mm
Turning angle	450		450		450
Min. ground clearance	268mm		330mm		330mm
Speed	0-10 km/h		0~12~24km/h, 2 speed		0~12~24km/h, 2 speed
Operating weight	1850 kg		2300kg		2600kg
Standard tire	26X12-12		31X15.5-15		31X15.5-15
Tire pressure	2.8 bar		2.8 bar		2.8 bar
Oil tank capacity	45L		80L		80L
Pressure	190bar		190 bar		190bar
Working oil flow	33.5L/minx2		41L/min x 2		50L/min x 2
Tracking oil flow	78L/min		120L/min		120L/min
Oil model(mineral oil)	L-HL46		L-HL46		L-HL46
Fuel tank capacity	30L		42L		52L
Battery	60Ah, 12V		60Ah, 12V		60Ah, 12V
Engine	Perkins/Yanmar		Perkins/Yanmar/Kohler		Yanmar/Kohler/Chinese
Rated power	33hp		50hp		68hp-74hp

Detailed images:

Inside cabin

Telescopic boom

Tipping cabin 

Rear hydraulic output and 3 point hitch 

Bobcat type skid steer loader adapter plate (optional). Customers who had some bobcat attachments can choose this option to save money buy new ones

Applications:

Loader+Tractor, 1 Multi-purpose helper for all your works
Front part is loader, with telescopic boom, hydraulic output, quick hitch and coupling system for various attachments, like bucket, fork, grapple, auger, hammer, lawn mower, etc.

Rear part is tractor, with hydraulic output, 3-point hitch, hydraulic PTO, for rotary tiller, flail mower, plough, harrow, trailer, etc.
STEEL CZPT series machines are widely used in farming, agriculture, landscaping, gardening, construction, municiple, etc.

Packing and loading:

Till now STEEL CZPT products, telehandlers, wheel loaders, excavators, attachments etc. have been servicing customers in many countries, like Germany, Russia, Poland, UK, Argentina, Australia, USA, Canada, Indonisia, Spain......

  

Our Service:

Pre-Sales Service:	After Sales Service:
* Inquiry and consulting support.  * Oversea sample testing support.  * Visiting our Factory. * Transporting from factory to door	* Training how to instal the machine, * Training how to use the machine.  * Engineers available to service machinery overseas. * Warranty and whole workling life service

Inquiry Now:
With more than 10 years' experience of production and exporting, I'm ready to be your reliable consultant about products and importing procedure anytime. 

 

An Overview of Worm Shafts and Gears

This article provides an overview of worm shafts and gears, including the type of toothing and deflection they experience. Other topics covered include the use of aluminum versus bronze worm shafts, calculating worm shaft deflection and lubrication. A thorough understanding of these issues will help you to design better gearboxes and other worm gear mechanisms. For further information, please visit the related websites. We also hope that you will find this article informative.

Double throat worm gears

The pitch diameter of a worm and the pitch of its worm wheel must be equal. The 2 types of worm gears have the same pitch diameter, but the difference lies in their axial and circular pitches. The pitch diameter is the distance between the worm's teeth along its axis and the pitch diameter of the larger gear. Worms are made with left-handed or right-handed threads. The lead of the worm is the distance a point on the thread travels during 1 revolution of the worm gear. The backlash measurement should be made in a few different places on the gear wheel, as a large amount of backlash implies tooth spacing.
A double-throat worm gear is designed for high-load applications. It provides the tightest connection between worm and gear. It is crucial to mount a worm gear assembly correctly. The keyway design requires several points of contact, which block shaft rotation and help transfer torque to the gear. After determining the location of the keyway, a hole is drilled into the hub, which is then screwed into the gear.
The dual-threaded design of worm gears allows them to withstand heavy loads without slipping or tearing out of the worm. A double-throat worm gear provides the tightest connection between worm and gear, and is therefore ideal for hoisting applications. The self-locking nature of the worm gear is another advantage. If the worm gears are designed well, they are excellent for reducing speeds, as they are self-locking.
When choosing a worm, the number of threads that a worm has is critical. Thread starts determine the reduction ratio of a pair, so the higher the threads, the greater the ratio. The same is true for the worm helix angles, which can be one, two, or 3 threads long. This varies between a single thread and a double-throat worm gear, and it is crucial to consider the helix angle when selecting a worm.
Double-throat worm gears differ in their profile from the actual gear. Double-throat worm gears are especially useful in applications where noise is an issue. In addition to their low noise, worm gears can absorb shock loads. A double-throat worm gear is also a popular choice for many different types of applications. These gears are also commonly used for hoisting equipment. Its tooth profile is different from that of the actual gear.

Bronze or aluminum worm shafts

When selecting a worm, a few things should be kept in mind. The material of the shaft should be either bronze or aluminum. The worm itself is the primary component, but there are also addendum gears that are available. The total number of teeth on both the worm and the addendum gear should be greater than 40. The axial pitch of the worm needs to match the circular pitch of the larger gear.
The most common material used for worm gears is bronze because of its desirable mechanical properties. Bronze is a broad term referring to various copper alloys, including copper-nickel and copper-aluminum. Bronze is most commonly created by alloying copper with tin and aluminum. In some cases, this combination creates brass, which is a similar metal to bronze. The latter is less expensive and suitable for light loads.
There are many benefits to bronze worm gears. They are strong and durable, and they offer excellent wear-resistance. In contrast to steel worms, bronze worm gears are quieter than their counterparts. They also require no lubrication and are corrosion-resistant. Bronze worms are popular with small, light-weight machines, as they are easy to maintain. You can read more about worm gears in CZPT's CZPT.
Although bronze or aluminum worm shafts are the most common, both materials are equally suitable for a variety of applications. A bronze shaft is often called bronze but may actually be brass. Historically, worm gears were made of SAE 65 gear bronze. However, newer materials have been introduced. SAE 65 gear bronze (UNS C90700) remains the preferred material. For high-volume applications, the material savings can be considerable.
Both types of worms are essentially the same in size and shape, but the lead on the left and right tooth surfaces can vary. This allows for precise adjustment of the backlash on a worm without changing the center distance between the worm gear. The different sizes of worms also make them easier to manufacture and maintain. But if you want an especially small worm for an industrial application, you should consider bronze or aluminum.

Calculation of worm shaft deflection

The centre-line distance of a worm gear and the number of worm teeth play a crucial role in the deflection of the rotor. These parameters should be entered into the tool in the same units as the main calculation. The selected variant is then transferred to the main calculation. The deflection of the worm gear can be calculated from the angle at which the worm teeth shrink. The following calculation is helpful for designing a worm gear.
Worm gears are widely used in industrial applications due to their high transmittable torques and large gear ratios. Their hard/soft material combination makes them ideally suited for a wide range of applications. The worm shaft is typically made of case-hardened steel, and the worm wheel is fabricated from a copper-tin-bronze alloy. In most cases, the wheel is the area of contact with the gear. Worm gears also have a low deflection, as high shaft deflection can affect the transmission accuracy and increase wear.
Another method for determining worm shaft deflection is to use the tooth-dependent bending stiffness of a worm gear's toothing. By calculating the stiffness of the individual sections of a worm shaft, the stiffness of the entire worm can be determined. The approximate tooth area is shown in figure 5.
Another way to calculate worm shaft deflection is by using the FEM method. The simulation tool uses an analytical model of the worm gear shaft to determine the deflection of the worm. It is based on a two-dimensional model, which is more suitable for simulation. Then, you need to input the worm gear's pitch angle and the toothing to calculate the maximum deflection.

Lubrication of worm shafts

In order to protect the gears, worm drives require lubricants that offer excellent anti-wear protection, high oxidation resistance, and low friction. While mineral oil lubricants are widely used, synthetic base oils have better performance characteristics and lower operating temperatures. The Arrhenius Rate Rule states that chemical reactions double every 10 degrees C. Synthetic lubricants are the best choice for these applications.
Synthetics and compounded mineral oils are the most popular lubricants for worm gears. These oils are formulated with mineral basestock and 4 to 6 percent synthetic fatty acid. Surface-active additives give compounded gear oils outstanding lubricity and prevent sliding wear. These oils are suited for high-speed applications, including worm gears. However, synthetic oil has the disadvantage of being incompatible with polycarbonate and some paints.
Synthetic lubricants are expensive, but they can increase worm gear efficiency and operating life. Synthetic lubricants typically fall into 2 categories: PAO synthetic oils and EP synthetic oils. The latter has a higher viscosity index and can be used at a range of temperatures. Synthetic lubricants often contain anti-wear additives and EP (anti-wear).
Worm gears are frequently mounted over or under the gearbox. The proper lubrication is essential to ensure the correct mounting and operation. Oftentimes, inadequate lubrication can cause the unit to fail sooner than expected. Because of this, a technician may not make a connection between the lack of lube and the failure of the unit. It is important to follow the manufacturer's recommendations and use high-quality lubricant for your gearbox.
Worm drives reduce backlash by minimizing the play between gear teeth. Backlash can cause damage if unbalanced forces are introduced. Worm drives are lightweight and durable because they have minimal moving parts. In addition, worm drives are low-noise and vibration. In addition, their sliding motion scrapes away excess lubricant. The constant sliding action generates a high amount of heat, which is why superior lubrication is critical.
Oils with a high film strength and excellent adhesion are ideal for lubrication of worm gears. Some of these oils contain sulfur, which can etch a bronze gear. In order to avoid this, it is imperative to use a lubricant that has high film strength and prevents asperities from welding. The ideal lubricant for worm gears is 1 that provides excellent film strength and does not contain sulfur.