Yantai Bonway Manufacturer

Plum coupling

The plum blossom coupling is a widely used coupling, also called a claw coupling, which is composed of two metal claw discs and an elastic body. The two metal claws are generally made of No. 45 steel, but aluminum alloys are also useful when load sensitivity is required.

Craftsmanship:
The plum coupling is processed by machining methods such as turning, milling, and broaching, and then undergoes overall heat treatment. In order to ensure sufficient mechanical strength, there is another type of claw plate on the market that is a casting, which can be mass-produced without processing loss. So the price is much lower than machining. But the performance of castings is not very good. It is best not to use it in some important occasions. And the claws of the casting are prone to tooth punching (claws falling off) at high speed or high load.
(1)Compact, no backlash, providing three different hardness elastomers;
(2) It can absorb vibration and compensate radial and angular deviation;
(3) Simple structure, convenient maintenance and easy inspection;
(4) Maintenance-free, oil-resistant and electrical insulation, working temperature 20℃-60℃;
(5) Plum blossom elastomer has four petals, six petals, eight petals and ten petals;
(6) The fixing methods include top wire, clamping and keyway fixing.

characteristic:
Elastomers are generally composed of engineering plastics or rubber. The life of the coupling is the life of the elastomer. Because the elastic body is compressed and not easy to be pulled. Generally, the life of the elastic body is 10 years. Because the elastic body has the function of buffering and damping, plum coupling is used more in the occasion of strong vibration. The performance limit temperature of the elastomer determines the operating temperature of the coupling, generally -35 to +80 degrees.

Fixed type:
The positioning screw fixed plum coupling is also called a claw coupling, which is composed of two metal claw discs and an elastic body. The two metal claws are generally made of No. 45 steel, but aluminum alloy or stainless steel can also be used when load sensitivity is required. The quincunx-shaped elastic coupling utilizes quincunx-shaped elastic elements to be placed between the two halves of the coupling claws to realize the coupling of the two halves of the coupling. Plum coupling has the characteristics of compensating the relative displacement of the two shafts, damping, buffering, small radial size, simple structure, no lubrication, high carrying capacity, convenient maintenance, etc. However, the two halves of the coupling must move in the axial direction when replacing the elastic element.

Method of choosing:
There are two main types of plum blossom couplings, one is the traditional straight claw type, and the other is the curved (concave) claw type zero-backlash coupling. The traditional straight-jaw type plum blossom coupling is not suitable for high-precision servo transmission applications. The zero-backlash claw type plum blossom coupling evolved on the basis of the straight claw type, but the difference is that its design can be adapted to the application of the servo system, and is often used to connect servo motors, stepping motors and ball screws. The curved surface is to reduce the deformation of the elastic plum spacer and limit the influence of centripetal force on it during high-speed operation. The zero-clearance claw coupling is composed of two metal sleeves (usually made of aluminum alloy, stainless steel can also be provided) and a plum blossom elastic spacer. The plum blossom elastic spacer has multiple leaf branches. Like a slider coupling, it also squeezes the plum blossom elastic spacer and the sleeves on both sides to ensure its zero clearance performance. Different from the slider coupling, the plum blossom coupling is driven by squeezing while the slider coupling is driven by shear.

When using a zero-clearance claw coupling, the user must be careful not to exceed the maximum bearing capacity of the elastic element given by the manufacturer (under the premise of ensuring zero clearance), otherwise the plum elastic spacer will be squashed and lost The elasticity and the loss of the preload will result in the loss of zero-gap performance, which may also be discovered by the user after a serious problem occurs.
The plum blossom coupling has good balance performance and is suitable for high-speed applications (the maximum speed can reach 30,000 rpm), but it cannot handle large deviations, especially axial deviations. Larger eccentricity and deflection angle will produce larger bearing load than other servo couplings. Another value of concern is the failure of the plum blossom coupling. Once the quincunx elastic spacer is damaged or fails, the torque transmission will not be interrupted, and the metal claws of the two shaft sleeves mesh together to continue to transmit the torque, which is likely to cause problems in the system. Choosing the appropriate plum blossom elastic spacer material according to the actual application is a major advantage of this coupling. Some automation equipment companies can provide plum blossom spacers of various elastic materials with different hardness and temperature resistance, allowing customers to choose the right material Meet the performance standards of practical applications.

Features:
The plum blossom coupling is simple in structure, does not require lubrication, is convenient for maintenance, easy for inspection, maintenance-free, and can run continuously for a long time. High-strength polyurethane elastic elements are wear-resistant and oil-resistant, have large carrying capacity, long service life, and are safe and reliable. The work is stable and reliable, with good vibration damping, buffering and electrical insulation properties. It has large axial, radial and angular compensation capabilities. The structure is simple, the radial size is small, the weight is light, and the moment of inertia is small. It is suitable for medium and high speed occasions.
Structural features:
1. Intermediate elastomer connection
2. It can absorb vibration, compensate radial, angular and axial deviation
3. Oil resistance and electrical insulation
4. Clockwise and counterclockwise rotation characteristics are exactly the same
5. Fixed with positioning screws

Application range:
Plum blossom couplings are widely used in CNC machine tools, CNC lathes, machining centers, engraving machines, CNC milling machines, computer gongs, metallurgical machinery, mining machinery, petroleum machinery, chemical machinery, lifting machinery, transportation machinery, light industrial machinery, textile machinery , Water pumps, fans, etc.

nstallation and removal:
1. Wipe clean the dust and dirt on the surface of the installation shaft, and apply a thin layer of engine oil or lubricant to the side.
2. Clean the inner hole of the coupling, and apply oil or lubricant.
3.Insert the coupling into the installation shaft; if the aperture is too tight, be careful not to hit the installation with a hammer or hard metal.
4. After the positioning is completed, first use a torque wrench (the specified tightening torque 1/4) to gently tighten the screws in the diagonal direction.
5. Increase the strength (1/2 of the specified tightening torque) and repeat the fourth step.
6.Tighten the tightening torque according to the specified tightening torque.
7.Finally, tighten the fixing screws in the circumferential direction.
8.When disassembling, please proceed with the device completely stopped; loosen the locking screws in turn.

Installation skills:
Professional coupling manufacturers teach you the correct installation skills of plum couplings, plum couplings are used more and more widely, but many users are not very clear about some details of the installation of plum couplings, here is for you Briefly introduce:
1. Before installation, first check whether the prime mover and the working machine are concentric, whether there are wrapping paper and scratches on the surfaces of the two shafts, whether there are debris in the inner holes of the two half couplings of the plum coupling, and whether the edges of the inner holes are If there are bruises, the shaft and half coupling should be cleaned up, and the bruises should be treated with a fine file. Then check whether the inner hole diameter and length of the two half couplings are consistent with the diameter and shaft elongation of the prime mover and working machine. In general selection, it is better to make the length of the prime mover and the working machine end half coupling be less than the shaft elongation of 10-30mm.
2. In order to facilitate the installation, it is best to put the two half couplings in the 120-150 incubator or oil tank for preheating, so that the inner hole size increases and plum coupling is easy to install. After installation, ensure that the shaft head cannot protrude from the end face of the half coupling, and it is better to be flush. Detect the distance between the two halves of the coupling: take the average of the readings of 3-4 points measured along the two inner sides of the flange of the half coupling, and the sum of the measured dimensions of the extension and the two diaphragm sets. The error is controlled within the range of 0-0.4mm.

3. Alignment: use a dial indicator to detect the runout of the flange end face and outer circle of the two halves of the coupling flange. When the flange outer circle is less than 250mm, the runout value should not exceed 0.05mm; when the flange outer circle is greater than 250mm , The jitter value should not be greater than 0.08.
4. Install the bolts: insert the bolts from the outside of the small hole of the flange, pass through the outside of the large hole of the other flange, put on the buffer sleeve, elastic washer, twist the nut, and tighten the nut with a wrench. If the installation is unsuitable or if plum coupling is removed and replaced without damaging the shaft and the half coupling, it is better to rotate freely after installation.
5. Instructions for operators: Before starting the equipment, check whether the nut of the torx coupling is loose or falling off. If so, tighten the nut with a wrench in time.

MLS (LMS) plum blossom flexible coupling features and applications: plum coupling has compensation for the relative deviation of the two shafts, damping, cushioning performance, small radial size, simple structure, no lubrication, high bearing capacity, maintenance only, flexible replacement Components need to move axially (except MLS type), suitable for connecting coaxial lines, frequent starting, positive and negative changes, medium speed, medium torque transmission shaft system and working parts requiring high working reliability-high. It is not suitable for heavy load, low speed and difficult parts of the axial size, and the two shafts are difficult to align after replacing the elastic element.

The characteristics and application of ML (LM) plum blossom elastic coupling: It has compensation for the relative deviation of the two shafts, damping, cushioning performance, small radial size, simple structure, no lubrication, high bearing capacity, maintenance only, The replacement of elastic components requires axial movement (except for MLS type), which is suitable for connecting coaxial lines, frequent starting, positive and negative changes, medium speed, medium torque transmission shaft system and working parts requiring high working reliability. It is not suitable for heavy load, low speed, and difficult parts of the axial size, and the two shafts are difficult to align after replacing the elastic element.

MLL-I (LMZ-I) plum blossom coupling features and applications: plum coupling has compensation for the relative offset of the two shafts, damping, cushioning performance, small radial size, simple structure, no lubrication, high load capacity, and maintenance , The replacement of elastic elements requires axial movement (except for MLS type), suitable for connecting coaxial lines, frequent starting, positive and negative changes, medium speed, medium torque transmission shaft system and working parts requiring high working reliability-high. It is not suitable for heavy load, low speed and difficult parts of the axial size, and the two shafts are difficult to align after replacing the elastic element.

MLS (LMS) plum blossom flexible coupling features and applications: it has compensation for the relative deviation of the two shafts, damping, cushioning performance, small radial size, simple structure, no lubrication, high bearing capacity, maintenance only, flexible replacement Components need to move axially (except MLS type), suitable for connecting coaxial lines, frequent starting, positive and negative changes, medium speed, medium torque transmission shaft system and working parts requiring high working reliability-high. It is not suitable for heavy load, low speed and difficult parts of the axial size, and the two shafts are difficult to align after replacing the elastic element.