Friction torsion limiting device

Abstract

The utility model belongs to the technical field of machining equipment accessories, and particularly relates to a friction torsion limiting device which comprises a limiting device structural body, a first belleville spring, a first load disc, a first torque friction plate, a chain wheel mechanism, a second torque friction plate, a second load disc, a second belleville spring, a tooth-shaped retaining clamping pad and a locking nut. Pre-pressure is applied to the friction plates through the springs, and it is guaranteed that enough friction force exists between the friction plates in the normal working state. Through the unique design of the spring assembly and the adjusting mechanism, accurate setting and stable maintaining of a torque limiting value are ensured, and the reliability of the device is effectively improved. And meanwhile, equipment damage caused by torque overload is reduced, and the maintenance cost of the equipment is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of processing equipment accessories, and specifically relates to a friction torque limiting device. BACKGROUND

[0002] With the in-depth development of intelligent manufacturing of the mechanical industry, the power transmission system of automatic equipment has increasingly strict requirements for high speed and high precision operation. As a key component for ensuring the stable operation of mechanical processing equipment, the friction torque limiting device is facing new development opportunities. However, the existing friction torque limiting device has the problems of relatively slow response speed and poor reliability, and cannot timely and effectively limit the torque. When the equipment is overloaded in torque, the existing device is difficult to respond in time, causing the equipment to be damaged due to overload torque, increasing the equipment maintenance cost, and seriously affecting the production efficiency and restricting the further development of the mechanical processing industry. CONTENT OF THE UTILITY MODEL

[0003] The utility model provides a kind of friction torque limiting device, to solve the problem of existing device difficult to respond in time when equipment is overloaded in torque in prior art.

[0004] To achieve the above purpose, the utility model provides the technical scheme as follows:

[0005] A kind of friction torque limiting device, including limiting device structure, first disc spring, first load disc, first torque friction piece, sprocket mechanism, second torque friction piece, second load disc, second disc spring, toothed stop card washer and locking nut;

[0006] One end of the limiting device structure is a cap-shaped structure, and the other end is a threaded screw structure, the threaded screw structure passes through, in sequence, the first disc spring, the first load disc, the first torque friction piece, the sprocket mechanism, the second torque friction piece, the second load disc, the second disc spring, the toothed stop card washer and the locking nut;

[0007] The first disc spring and the second disc spring are completely the same in shape and structure;The first load disc and the second load disc are completely the same in shape and structure;The first torque friction piece and the second torque friction piece are completely the same in shape and structure.

[0008] Preferably, the cap-shaped structure of the limiting device structure is designed with three reinforcing rib plates at 120 degrees to each other;The threaded screw structure surface of the limiting device structure is symmetrically distributed with two milling planes.

[0009] Preferably, the toothed stop card washer is concentric with the limiting device structure, and the toothed stop card washer is provided with a central square hole sleeve, and the toothed stop card washer is arranged on the milling plane of the limiting device structure through the central square hole sleeve.

[0010] Preferably, the first torque friction plate is uniformly distributed with a plurality of friction blocks on both sides.

[0011] Preferably, the first torque friction plate is made of asbestos composite material.

[0012] Preferably, the safety heat dissipation push piece is arranged between the second load disc and the second disc spring.

[0013] Preferably, the safety heat dissipation push piece is arranged between the second load disc and the second disc spring.

[0014] Preferably, the safety heat dissipation push piece is made of aluminum; and the surface of the safety heat dissipation push piece is subjected to hard anodic oxidation treatment.

[0015] The utility model discloses the beneficial effect lies in:

[0016] The utility model provides a friction torque limiting device, through the spring to the friction plate exert pre -pressure, ensure under normal working condition, there is enough friction between friction plate. Through the compression of spring, can set up the torque limit value of device flexibly. Friction plate group is clamped between load disc and sprocket mechanism, relies on the friction between friction plate realizes torque transmission. Unique spring assembly and adjusting mechanism design, ensure the accurate setting and stable keeping of torque limit value, effectively promote the reliability of device. Simultaneously, the equipment damage of torque overload has been reduced, and the maintenance cost of equipment has been further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] The description and drawings of the utility model constitute a part of the utility model, and are used to provide further understanding on the utility model, and the illustrative embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0018] Figure 1 It is a kind of friction torque limiting device schematic diagram;

[0019] Figure 2 It is a kind of friction torque limiting device section schematic diagram;

[0020] Figure 3 It is a kind of friction torque limiting device parts explosion map;

[0021] Figure 4 It is a kind of friction plate schematic diagram. DETAILED DESCRIPTION

[0022] The utility model will be described in detail below with reference to the drawings and in combination with embodiment. It should be noted that the embodiment in the utility model and the features in the embodiment can be combined with each other without conflict.

[0023] The following detailed description is exemplary in nature and is intended to provide further detail on the present application. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the present application is for describing the particular embodiments only and is not intended to be limiting according to the example embodiments of the present application.

[0024] Referring to Figs. Figure 1 , 2 and 3, the present application provides a friction torque limiting device, comprising a limiting device structure 1, a first disc spring 2, a first load disc 3, a first torque friction plate 4, a sprocket mechanism 5, a second torque friction plate 6, a second load disc 7, and a safety heat dissipation push piece 8, a second disc spring 9, a tooth-shaped anti-back-off washer 10, and a locking nut 11.

[0025] One end of the limiting device structure 1 is a cap-shaped structure, and three reinforcing rib plates that are 120 degrees apart from each other are designed on the top of the cap-shaped structure to increase the strength, and all are rounded and smoothed. The other end of the limiting device structure 1 is a threaded screw structure, and two planes are symmetrically milled on the surface of the threaded screw structure. By milling the planes, the contact area of the threaded connection part with other parts can be increased, and the strength and reliability of the connection can be improved to some extent, especially in the case of bearing a larger tension or torque, the stress can be better dispersed, and the threaded screw is prevented from being damaged due to uneven stress. A through hole is also provided on the limiting device structure 1, and a key groove is provided on the side of the cap-shaped structure close to the through hole. The through hole facilitates the connection of the limiting device structure 1 and the transmission shaft of the mechanical equipment.

[0026] The first disc spring 2 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the first disc spring 2, and the inner edge of the center of the first disc spring 2 is attached to the cap-shaped structure.

[0027] The first load disc 3 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the first load disc 3, and the first load disc 3 is attached to the outer conical disc surface of the first disc spring 2.

[0028] The first torque friction plate 4 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the first torque friction plate 4, and the first torque friction plate 4 is attached to the first load disc 3.

[0029] The sprocket mechanism 5 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the sprocket mechanism 5, and the sprocket mechanism 5 is attached to the first torque friction plate 4.

[0030] The second torque friction plate 6 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the second torque friction plate 6, and the second torque friction plate 6 is attached to the sprocket mechanism 5.

[0031] The second load disc 7 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the second load disc 7, and the second load disc 7 is attached to the second torque friction plate 6.

[0032] The safety heat dissipation push piece 8 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the safety heat dissipation push piece 8, the center square hole of the safety heat dissipation push piece 8 is sleeved on the milled plane of the limiting device structure 1, and the safety heat dissipation push piece 8 is attached to the second load disc 7.

[0033] The second disc spring 9 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the second disc spring 9, and the outer conical disc surface of the second disc spring 9 is attached to the safety heat dissipation push piece 8.

[0034] The tooth-shaped stopper pad 10 is concentric with the limiting device structure 1, the threaded screw structure of the limiting device structure 1 passes through the tooth-shaped stopper pad 10, the center square hole of the tooth-shaped stopper pad 10 is sleeved on the milled plane of the limiting device structure 1, and the center inner edge of the tooth-shaped stopper pad 10 is attached to the second disc spring 9.

[0035] The locking nut 11 is concentric with the limiting device structure 1, the internal thread structure of the locking nut 11 is matched with the threaded screw structure of the limiting device structure 1, the locking nut 11 is attached to the tooth-shaped stopper pad 10 by rotating the locking nut 11 clockwise.

[0036] The utility model adopts mechanical structure symmetry mirror image mode, first disc spring 2 and second disc spring 9 are completely same in shape, structure, layout and function etc. First load disc 3 and second load disc 7 are completely same in shape, structure, layout and function etc. First torque friction plate 4 and second torque friction plate 6 are completely same in shape, structure, layout and function etc. It is guaranteed that the external force of the device mechanical in the operation process is evenly distributed, and local wear or deformation caused by uneven stress is avoided. The symmetrical structure helps to improve the stability of the mechanical system. At the same time, the same process and tooling can be used for processing, which reduces the manufacturing difficulty and cost. It is conducive to large-area production and promotion. Further improve the operation efficiency of the whole production system, improve production efficiency.

[0037] The first torque friction plate 4 and the second torque friction plate 6 are core components of the device, usually made of an asbestos composite material with good friction performance, providing sufficient strength and rigidity to enable the friction plate to withstand pressure and torque under working conditions. At the same time, the contact area and material thermal deformation characteristics between the first torque friction plate 4 and the first load disc 3, and between the second torque friction plate 6 and the second load disc 7, also affect the torque transmission capacity and limiting effect. Since the first torque friction plate 4 and the second torque friction plate 6 are completely identical in shape, structure, layout, and function, the first torque friction plate 4 is taken as an example for illustration.

[0038] As shown in Figure 4 The first torque friction plate 4 is uniformly distributed with a plurality of first friction blocks 401 on one side, and a plurality of second friction blocks 402 on the other side.

[0039] In the case of the first disc spring 2 applying positive pressure to the first torque friction plate 4, the first friction blocks 401 are tightly attached to the first load disc 3, and the second friction blocks 402 are tightly attached to the sprocket mechanism 5, transmitting the input shaft torque of the limiting device structure 1 to the output torque of the sprocket mechanism 5, while the first load disc 3, the sprocket mechanism 5, and the first torque friction plate 4 cooperate to realize the torque limiting function. During torque transmission, the first friction blocks 401 are tightly attached to the first load disc 3, and the second friction blocks 402 are tightly attached to the sprocket mechanism 5, realizing smooth start and stop of the sprocket mechanism 5, reducing impact and vibration, and improving the running stability of the equipment.

[0040] In a specific embodiment, the first torque friction plate 4 is uniformly distributed with 12 first friction blocks 401 on one side, and 12 second friction blocks 402 on the other side.

[0041] The safety heat dissipation push piece 8 is made of aluminum and made of a metal material with high thermal conductivity. The surface of the safety heat dissipation push piece 8 is specially treated. When the temperature rises, the push piece deforms elastically, which is based on the thermal expansion and contraction characteristics of the material. The deformed safety heat dissipation push piece 8 is attached to the second load disc 7 with a reduced contact area, reducing the additional friction generated by contact and reducing the heat source.

[0042] In a specific embodiment, the safety heat dissipation push piece 8 is made of aluminum, which is easy to obtain and has low cost. The surface of the safety heat dissipation push piece 8 is treated by hard anodizing, which improves the hardness and thickens the film layer, suitable for wear-resistant occasions.

[0043] In a specific embodiment, a temperature sensor is installed on the device, and the temperature data is transmitted to the control system of the device using Internet of Things technology. When the control system detects a sudden temperature rise of the friction torque limiting device, it is predicted that the temperature rise is caused by the overloading of the torque, which intensifies the friction of the friction plate. The system will issue a warning and automatically reduce the input shaft speed to prevent further damage to the device caused by the increase in torque.

[0044] In a specific embodiment, an artificial intelligence algorithm is introduced to analyze multiple parameters such as temperature and torque in real time, predict potential failures in advance, and achieve more accurate early warning and control. At the same time, based on the obtained data, the layout of the sensor is optimized to ensure the comprehensiveness and accuracy of the collected data and improve the overall reliability of the system.

[0045] The utility model provides a kind of friction torque limiting device, first, each component is sequentially installed according to order, the pressure of first disc spring 2 and second disc spring 9 is set by rotating and being attached with locking nut 11 of tooth shape stopper pad 10.Tooth shape stopper pad 10 has certain elasticity, when locking nut 11 is tightened, tooth shape stopper pad 10 will be compressed, and elastic deformation is generated.Each component can be prevented from moving along axial direction, tooth shape stopper pad 10 has special tooth shape structure, and tooth shape structure can be tightly engaged with the surface of lock nut.This engagement can increase friction, prevent locking nut 11 from rotating or displacing when vibrating.

[0046] Under the continuous pressure of first disc spring 2 and second disc spring 9, first load disc 3, first torque friction plate 4, sprocket mechanism 5, second torque friction plate 6 and second load disc 7 are always closely attached, and this design can ensure the tightness of the connection between each component, effectively transmit torque and load.In the operation process of sprocket mechanism 5, first torque friction plate 4 and second torque friction plate 6 can better realize torque transmission, reduce energy loss and slipping phenomenon.At the same time, first load disc 3 and second load disc 7 can also stably bear and transmit load under the pressure of disc spring, improve the working efficiency and reliability of the whole mechanism.In addition, disc spring has good elasticity and large axial stiffness, and will generate continuous pressure when it is compressed.The use of disc spring can also buffer the vibration and impact generated during the operation of sprocket mechanism 5 to some extent, protect each component from damage and prolong the service life of the device.

[0047] In normal operation, the sprocket mechanism 5 is in close contact with the first torque friction plate 4 and the second torque friction plate 6, realizing stable torque transmission. Once the torque of the sprocket mechanism 5 exceeds the set threshold, the first torque friction plate 4 and the second torque friction plate 6 start to slide with the friction surface of the sprocket mechanism 5 due to insufficient friction to maintain relative static state. This sliding consumes the excess torque, protecting the critical components of the equipment from excessive stress.

[0048] When the torque of the sprocket mechanism 5 exceeds the set value, relative sliding occurs between the first friction block 401 and the friction surface of the first load disc 3, and between the second friction block 402 and the friction surface of the sprocket mechanism 5, thereby limiting the further transmission of torque. Relative sliding between the first torque friction plate 4, the second torque friction plate 6 and the friction surface of the sprocket mechanism 5 may cause the temperature of the first load disc 3, the second load disc 7 and the safety heat dissipation push piece 8 to rise due to heat generated by friction under high load working conditions.

[0049] The improved friction torque limiting device adopts the principle that friction is proportional to normal pressure, and the torque limiting value is set by adjusting the size of the normal pressure. By tightening or loosening the locking nut 11 matched with the threaded screw structure of the limiting device structure 1, the pressure applied by the first disc spring 2 and the second disc spring 9 can be adjusted, and different torque limiting values can be conveniently set to adapt to different working conditions and equipment requirements.

[0050] The safety heat dissipation push piece 8 can dissipate heat to the surrounding air, effectively improving the heat dissipation efficiency and preventing the first torque friction plate 4, the second torque friction plate 6, the first load disc 3 and the second load disc 7 from performance degradation or failure due to overheating. After the safety heat dissipation push piece 8 is heated and elastically deformed, the contact area with the second load disc 7 is reduced, thereby reducing part of the friction pressure.

[0051] It is known from common technical knowledge that the present application can be implemented by other embodiments without departing from the spirit or essential characteristics thereof. Therefore, the above disclosed embodiments are merely illustrative in all aspects, and are not the only ones. All changes within the scope of the present application or within the scope equivalent to the present application are included in the present application.

[0052] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application. Any modification or equivalent replacement without departing from the spirit and scope of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A frictional torque limiting device, characterized by, The restriction device structure body, the first disc spring, the first load disc, the first torque friction plate, the chain wheel mechanism, the second torque friction plate, the second load disc, the second disc spring, the tooth-shaped anti-back-off washer and the locking nut are sequentially arranged. One end of the restriction device structure body is in a cap shape, and the other end is in a threaded screw structure. The first disc spring and the second disc spring are completely identical in shape and structure.

2. A frictional torque limiting device as claimed in claim 1, characterized in that The top of the cap-shaped structure of the restriction device structure body is provided with three reinforcing rib plates which are 120 degrees apart from each other.

3. A frictional torque limiting device as claimed in claim 2, characterized in that The surface of the threaded screw structure of the restriction device structure body is symmetrically provided with two milled planes.

4. A frictional torque limiting device as claimed in claim 1, characterized in that The tooth-shaped anti-back-off washer is coaxial with the restriction device structure body.

5. A frictional torque limiting device as claimed in claim 1, characterized in that The first torque friction plate is made of asbestos composite material.

6. A frictional torque limiting device as claimed in claim 1, characterized in that A safety heat dissipation push piece is further arranged between the second load disc and the second disc spring.

7. A frictional torque limiting device as claimed in claim 6, characterized in that A temperature sensor is arranged on the safety heat dissipation push piece.

8. A frictional torque limiting device as claimed in claim 6, characterized in that The safety heat dissipation push piece is made of aluminum. The surface of the safety heat dissipation push piece is subjected to hard anodic oxidation treatment.

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