Torque limiter and assembling method

Abstract

The invention belongs to the technical field of torque overload protection, and particularly relates to a torque limiter and an assembling method. The torque limiter comprises a pressing flange and a connecting flange which are coaxially connected, a plurality of axially-arranged connecting assemblies are evenly arranged between the pressing flange and the connecting flange in the circumferential direction, each connecting assembly comprises a bolt and a connecting pin, one end of each bolt abuts against the pressing flange or the connecting flange in the axial direction, and the other end of each bolt abuts against the connecting flange. One end of the connecting pin is axially connected with the connecting flange or the pressing flange in an abutting mode, and the other end of the connecting pin is connected with the bolt.

Description

Technical Field

[0001] The invention belongs to the technical field of torque overload protection, and in particular, relates to a torque limiter and a torque limiter assembly method. Background Art

[0002] The torque limiter is mainly composed of a clamping flange, a connecting flange, a friction disc, bolts, etc. Among them, the friction disc is located between the clamping flange and the connecting flange, and the bolts axially pass through the clamping flange and the connecting flange, and the axial force of the bolts causes the clamping flange and the connecting flange to clamp the friction disc.

[0003] The torque limiter plays the role of transmitting torque and overload protection in the transmission chain. In order to avoid and reduce the shear force on the bolt, a pin structure, such as an elastic pin, is often provided in the torque limiter structure. Specifically, in the prior art, the clamping flange and the connecting flange are provided with a pin hole for accommodating the pin structure. If the pin structure and the pin hole are interference fit, the interference between the pin structure and the pin hole will cause the pin structure to scratch the pin hole of the flange, and also cause the axial force provided by the bolt that should act on the friction disk to be mostly shared by the pin structure, so that the torque limiter bolt tightening torque is highly dispersed and there is a risk of bolt loosening.

[0004] The discreteness of the bolt tightening torque between different torque limiters is large, which is not conducive to the unification of the assembly process.

[0005] In the prior art, due to the inherent structure of the torque limiter, when the bolt is loaded with axial force, the flange will cause different degrees of elastic deformation, thereby reducing the contact rate between the flange and the friction disk, increasing the local pressure of the friction disk, and increasing the risk of failure of the torque limiter.

[0006] Therefore, in view of the above technical problems, it is urgent to develop a new torque limiter. Summary of the invention

[0007] In view of the above-mentioned technical problems, the present invention aims to provide a torque limiter, which can solve at least one of the above-mentioned technical problems.

[0008] The present invention also provides a method for assembling a torque limiter, which is suitable for assembling the torque limiter provided by the present invention.

[0009] According to the present invention, a torque limiter is provided, comprising a coaxially connected clamping flange and a connecting flange, characterized in that a plurality of axially arranged connecting components are evenly arranged along the circumferential direction between the clamping flange and the connecting flange, the connecting components comprising bolts and connecting pins, one end of the bolts axially abuts against the clamping flange or the connecting flange, and the other end is connected to the connecting pin, one end of the connecting pin axially abuts against the connecting flange or the clamping flange, and the other end is connected to the bolt.

[0010] In a specific embodiment, the connecting pin includes a pin shaft and a connecting head coaxially arranged at the end of the pin shaft, the pin shaft is located in the clamping flange and the connecting flange, and the connecting head axially abuts against the clamping flange or the connecting flange.

[0011] In a specific embodiment, the flange axially abutting the connector adopts a clearance fit with the pin shaft, and the other flange adopts an interference fit with the pin shaft.

[0012] In a specific embodiment, the bolt and its corresponding flange are axially abutted against each other via a spring washer, and the outer diameter of the connecting head is equal to the outer diameter of the spring washer.

[0013] In a specific embodiment, a boss for abutting against a corresponding flange is provided on the end surface of the connecting head, and the outer diameter of the boss is equal to the outer diameter of the spring washer.

[0014] In a specific embodiment, a chamfer is provided at one end of the pin shaft away from the connecting head.

[0015] In a specific embodiment, a threaded hole is coaxially arranged in the connecting pin, and the bolt is matched with the threaded hole.

[0016] In a specific embodiment, the threaded hole penetrates the connecting pin.

[0017] In a specific embodiment, adjacent connecting components are arranged alternately in positive and negative directions.

[0018] According to the present invention, there is also provided an assembly method for the torque limiter provided by the present invention. After the clamping flange and the connecting flange are aligned with each other, the connecting pin is hydraulically assembled into the clamping flange and the connecting flange from one end, and the bolt is assembled into the clamping flange and the connecting flange from the other end, and the bolt is threadedly connected to the connecting pin.

[0019] Compared with the prior art, the advantages of the present application are as follows.

[0020] The connecting pin of the present invention is coaxially connected with the bolt. On the one hand, the connecting pin plays a role in bearing the shear force; on the other hand, the connecting pin is connected with the bolt to play a role in providing an axial force for the flange.

[0021] The connecting pin and the bolt of the present invention jointly provide axial force for the flange, which can avoid the connecting pin from sharing the axial force, thereby improving the utilization rate of the bolt, reducing the bolt tightening torque, and reducing the risk of bolt failure. Correspondingly, the axial force acting on the friction disk is also increased. In addition, the axial force shared by the pin structure in the prior art is an uncertain value. Since the connecting pin of the present invention does not share the axial force, the tightening torque of the bolt is equivalent to the axial force acting on the friction disk, thereby improving the consistency of the bolt tightening torque between different torque limiters and solving the problem of large discreteness of the bolt tightening torque between different torque limiters.

[0022] The connecting assembly of the present invention is installed alternately in forward and reverse directions, which can reduce the local deformation of the flange, increase the contact rate between the torque limiter flange and the friction disc assembly, and improve product quality.

[0023] The connecting pin of the present invention is coaxially connected with the bolt, which can avoid the situation where the connecting pin is subjected to uneven force in the circumferential direction, thereby improving the reliability of the torque limiter.

[0024] The connecting pin and the bolt of the present invention provide axial force to the flanges on both sides by abutting, which can make the axial force acting on the flanges on both sides more uniform and improve the reliability of the torque limiter. The present invention can avoid the situation in the prior art where one end of the bolt axially abuts against the clamping flange and the other end acts on the connecting flange through the threaded hole on the connecting flange, and finally the stress on the clamping flange side and the connecting flange side on the friction disk are inconsistent, resulting in wear on one side of the friction disk first. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described below with reference to the accompanying drawings.

[0026] Figure 1 A schematic cross-sectional view of an embodiment of a torque limiter according to the present invention is shown;

[0027] Figure 2 Shows Figure 1 The enlarged schematic diagram on the right;

[0028] Figure 3 Shows Figure 2 A magnified schematic diagram of part A;

[0029] Figure 4 Shows Figure 2 A magnified schematic diagram of part B;

[0030] Figure 5 A schematic structural diagram of a connecting pin according to the present invention is shown;

[0031] Figure 6 Shows Figure 5 A magnified schematic diagram of part C;

[0032] Figure 7 A perspective structural diagram of a torque limiter according to the present invention is shown.

[0033] In the figure: 1. clamping flange; 11. first through hole; 12. second through hole; 13. third through hole; 2. connecting flange; 3. connecting pin; 31. pin shaft; 32. connecting head; 321. boss; 33. threaded hole; 4. friction disc; 5. bolt; 6. connecting assembly; 7. spring washer; 8. sealing element; 81. first sealing part; 82. second sealing part; 100. torque limiter.

[0034] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0035] The present invention will be described below with reference to the accompanying drawings.

[0036] It should be noted that, in the present application, the direction of the drill cuttings and flue gas according to the present invention is described as "upstream", "front end" or similar terms, and the destination of the drill cuttings and flue gas is described as "downstream", "rear end" or similar terms.

[0037] It should be noted that the directional terms or qualifiers "upper", "lower", "left", "right", etc. used in this application are all relative to the referenced Figure 1 They are not intended to define the absolute positions of the components involved, but may vary depending on the specific circumstances.

[0038] Figure 1 1 shows the structure of a torque limiter 100 according to the present invention. Figure 1 As shown, the torque limiter 100 includes a clamping flange 1, a connecting flange 2 and a friction disc 4, wherein the central axes of the clamping flange 1, the connecting flange 2 and the friction disc 4 are all coincident, and the friction disc 4 is located between the clamping flange 1 and the connecting flange 2. Among them, the outer diameter of the friction disc 4 is smaller than the outer diameters of the clamping flange 1 and the connecting flange 2, and a plurality of connecting components 6 are evenly arranged at intervals along the circumferential direction on the clamping flange 1 and the connecting flange 2. The diameter of the circle where the connecting components 6 are located is larger than the outer diameter of the friction disc 4, and smaller than the outer diameters of the clamping flange 1 and the connecting flange 2, thereby providing an axial force for the clamping flange 1 and the connecting flange 2, so that the clamping flange 1 and the connecting flange 2 clamp the friction disc 4.

[0039] According to the present invention, in a specific embodiment, the connecting assembly 6 includes a bolt 5 and a connecting pin 3. Figure 2As shown, the bolt 5 and the connecting pin 3 are coaxially inserted into the clamping flange 1 and the connecting flange 2, and the bolt 5 and the connecting pin 3 are coaxially fixed by threaded connection, and the ends of the bolt 5 and the connecting pin 3 are axially abutted against the end faces of the clamping flange 1 and the connecting flange 2 respectively. In other words, the bolt 5 and the connecting pin 3 jointly provide axial force for the clamping flange 1 and the connecting flange 2, and the connecting pin 3 bears the shear force of the clamping flange 1 and the connecting flange 2. Through this arrangement, the tightening torque of the bolt 5 of the torque limiter 100 can be reduced, the risk of the bolt 5 being loosened can be reduced, the axial force of the bolt 5 acting on the friction disc 4 under the same tightening torque can be increased, and the utilization rate of the bolt 5 can be improved.

[0040] According to the present invention, the connection assembly 6 can be arranged in the clamping flange 1 and the connecting flange 2 in a forward direction, or can be arranged in the clamping flange 1 and the connecting flange 2 in a reverse direction.

[0041] Specifically, when the clamping flange 1 is coaxially arranged above the connecting flange 2, and the connecting assembly 6 is positively arranged in the clamping flange 1 and the connecting flange 2, as shown in FIG. Figure 2 As shown, the bolt 5 is inserted into the clamping flange 1 from top to bottom, the head of the bolt 5 is axially abutted against the upper end face of the clamping flange 1, and the tail of the bolt 5 extends into the clamping flange 1 and the connecting flange 2. The connecting pin 3 is inserted into the connecting flange 2 from bottom to top, the lower end of the connecting pin 3 is axially abutted against the lower end face of the connecting flange 2, and the upper end of the connecting pin 3 extends into the connecting flange 2 and the clamping flange 1. In addition, the bolt 5 and the connecting pin 3 are fixedly connected by threaded connection.

[0042] In a specific embodiment, when the connecting assembly 6 is reversely arranged in the clamping flange 1 and the connecting flange 2, as shown in FIG. Figure 1 In the structure of the connection assembly 6 shown on the far left, the connection pin 3 is inserted into the clamping flange 1 from top to bottom, the upper end of the connection pin 3 is axially abutted against the upper end face of the clamping flange 1, and the lower end of the connection pin 3 extends into the clamping flange 1 and the connecting flange 2. The bolt 5 is inserted into the connecting flange 2 from bottom to top, the lower end of the bolt 5 is axially abutted against the lower end face of the connecting flange 2, and the upper end of the bolt 5 extends into the connecting flange 2 and the clamping flange 1. In addition, the bolt 5 is fixedly connected to the connection pin 3 by threaded connection.

[0043] In a preferred embodiment, Figure 7 As shown, two adjacent connection components 6 are arranged on the clamping flange 1 and the connecting flange 2 in a positive and negative alternating manner. That is, if one of the connection components 6 is arranged in the clamping flange 1 and the connecting flange 2 in the positive direction, the connection component 6 adjacent to the connection component 6 is arranged in the negative direction in the clamping flange 1 and the connecting flange 2. Through this arrangement, the clamping flange 1 and the connecting flange 2 can be evenly stressed during assembly.

[0044] Furthermore, if Figure 2 and Figure 5 As shown, the connecting pin 3 includes a pin shaft 31 and a connecting head 32 coaxially arranged at the end of the pin shaft 31. The pin shaft 31 is set in a round tube shape, and the connecting head 32 is set in a round cake shape with a middle hole. The pin shaft 31 and the connecting head 32 are coaxially fixed to form a connecting pin 3 with a T-shaped overall cross section. The pin shaft 31 is located in the clamping flange 1 and the connecting flange 2, and the connecting head 32 axially abuts against the clamping flange 1 or the connecting flange 2.

[0045] Although the connecting pin 3 in the present embodiment is configured to be in an overall T-shape, the protection scope of the present invention is not limited thereto, and the connecting pin 3 can also be configured to have a variety of structures such as a cotter pin and a groove pin, as long as the connecting pin 3 can be coaxially connected to the bolt 5 and can provide axial force to the flange together with the bolt 5.

[0046] by Figure 2 Taking the example for explanation, the connecting assembly 6 is arranged in the clamping flange 1 and the connecting flange 2 in the forward direction. At this time, the pin shaft 31 of the connecting pin 3 is inserted into the connecting flange 2 from bottom to top and extends upward to the clamping flange 1, and the upper end face of the connecting head 32 abuts against the lower end face of the connecting flange 2.

[0047] In a preferred embodiment, the flange axially abutting the connector 32 and the pin 31 adopts a clearance fit, and the other flange and the pin 31 adopt an interference fit. Preferably, the interference fit is a small interference fit. Figure 2 Take an example to illustrate, at this time, the upper end face of the connector 32 abuts against the lower end face of the connecting flange 2, that is, the connecting flange 2 and the pin 32 adopt a clearance fit, and the clamping flange 1 and the pin 31 adopt an interference fit. The pin 31 adopts different matching methods with the connecting flange 2 and the clamping flange 1. Combined with the positive and negative alternating installation method of the connecting component 6, it can effectively avoid the local elastic deformation of the flange caused by the axial force of the bolt 5, thereby improving the contact rate between the flange and the friction disc 4, reducing the failure risk of the bolt 5, and improving the reliability of the torque limiter 100. From the circumferential angle of the torque limiter 100, the connecting component 6 adopts a positive and negative installation method, that is, the adjacent connecting pins 3 and the clamping flange 1 and the connecting flange 2 alternately adopt interference fit and clearance fit, so that the clamping flange 1 and the connecting flange 2 are basically consistent in the circumferential stress, which effectively improves the force conditions of the flanges on both sides of the torque limiter 100.

[0048] In a specific embodiment, the structure in which the connecting assembly 6 is positively installed in the clamping flange 1 and the connecting flange 2 is used as an example for explanation. Figure 2As shown, a first through hole 11 and a second through hole 12 are coaxially arranged in the clamping flange 1 in sequence from top to bottom in the axial direction, and the diameter of the first through hole 11 is smaller than the diameter of the second through hole 12. Specifically, the diameter of the first through hole 11 is configured to allow the bolt 5 to pass through, and the diameter of the second through hole 12 is configured to have an interference fit with the pin shaft 31 of the connecting pin 3. A third through hole 13 is axially arranged in the connecting flange 2, and the central axis of the third through hole 13 coincides with the central axis of the second through hole 12. Specifically, the diameter of the third through hole 13 is configured to have a clearance fit with the pin shaft 31 of the connecting pin 3.

[0049] According to the present invention, in a preferred embodiment, the bolt 5 and its corresponding flange are axially abutted by a spring washer 7, and the outer diameter of the connector 32 is equal to the outer diameter of the spring washer 7. Specifically, Figure 2 As shown, a spring washer 7 is arranged between the upper end of the bolt 5 and the upper end surface of the clamping flange 1, and the upper end of the bolt 5 transmits the axial force to the clamping flange 1 through the spring washer 7. The outer diameter of the surface of the connector 32 in contact with the connecting flange 2 is equal to the outer diameter of the spring washer 7, so that the axial force pressure from the connecting assembly 6 on the clamping flange 1 and the connecting flange 2 is equal, further avoiding local uneven deformation of the clamping flange 1 or the connecting flange 2.

[0050] In a preferred embodiment, Figure 5 and Figure 6 As shown, a boss 321 is provided on the end face of the connector 32 for contacting with the flange, and the outer diameter of the boss 321 is equal to the outer diameter of the spring pad 7. By providing the boss 321, the difficulty of processing the end face of the connector 32 can be reduced. From the perspective of axial force transmission of a single connecting component 6, by setting the outer diameter of the boss 321 equal to the outer diameter of the spring pad 7, the stresses on the clamping flange 1 and the connecting flange 2 can be made substantially consistent.

[0051] In a preferred embodiment, the outer diameter dimension tolerance of the pin shaft 31 of the connecting pin 3 adopts the m6 precision tolerance. Through this setting, the interference between the pin shaft 31 and the flange can be controlled within a better range, which can effectively solve the problem of inconsistent interference of the elastic pin in the existing torque limiter solution.

[0052] According to the present invention, in a preferred embodiment, a chamfer is provided at one end of the pin 31 away from the connector 32. Specifically, Figure 5 As shown, a chamfer is provided on the outer side of the upper end of the pin shaft 31. This arrangement effectively solves the problem of scratching the pin hole wall (the second through hole 12 and the third through hole 13), and improves the product quality of the torque limiter 100.

[0053] In a specific embodiment, Figure 2 and Figure 5As shown, a threaded hole 33 is coaxially arranged in the connecting pin 3, and the bolt 5 is matched with the threaded hole 33. Further, one end of the threaded hole 33 is located in the connecting head 32, and the other end of the threaded hole 33 is located in the pin shaft 31, and the length of the threaded hole 33 is less than the length of the pin shaft 31. Through this arrangement, the processing length of the threaded hole 33 is reduced, thereby reducing the precision requirement for the threaded hole 33.

[0054] In a preferred embodiment, Figure 5 As shown, the lower end of the threaded hole 33 penetrates the connecting head 32 of the connecting pin 33 .

[0055] According to the present invention, a method for assembling a torque limiter 100 is also provided. After the clamping flange 1 and the connecting flange 2 are aligned, a plurality of connecting components 6 are installed into the clamping flange 1 and the connecting flange 2 in an alternating forward and reverse manner.

[0056] When installing the connection assembly 6, first use hydraulic method to assemble the connection pin 3 from one axial end into the clamping flange 1 and the connecting flange 2 until the connection pin 3 is assembled in place. By first installing the connection pin 3 into the clamping flange 1 and the connecting flange 2, it is possible to avoid the connection pin 3 from sharing the axial force of the bolt 5, and to avoid the connection pin 3 scratching the side wall of the pin hole, resulting in low axial force utilization of the bolt 5. Then, the bolt 5 is assembled into the clamping flange 1 and the connecting flange 2 from the other axial end, and the bolt 5 is threadedly connected to the connection pin 3. By using the assembly method of the present invention to assemble the torque limiter 100, it is possible to effectively improve the consistency of the tightening torque of the bolt 5, reduce the tightening torque value of the bolt 5, reduce the failure risk of the bolt 5, and improve the product reliability of the torque limiter 100.

[0057] According to the present invention, in a preferred embodiment, Figure 4 As shown, a seal 8 is provided between the pressing flange 1 and the connecting flange 2 , and the seal 8 is located radially outside the pin shaft 31 of the connecting pin 3 .

[0058] Specifically, the seal 8 includes a first sealing portion 81 and a second sealing portion 82, which are connected to each other at a certain angle and are in a V-shape as a whole. The plane of the first sealing portion 81 is sealed with the sealing groove provided at the lower end of the clamping flange 1, and the second sealing portion 82 abuts against the sealing connection flange 2 at a certain angle, and the opening between the first sealing portion 81 and the second sealing portion 82 faces radially outward.

[0059] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0062] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A torque limiter, comprising a clamping flange (1) and a coupling flange (2) connected coaxially, characterized in that: A plurality of axially arranged connection assemblies (6) are evenly arranged along the circumferential direction between the clamping flange (1) and the connecting flange (2), and the connection assemblies (6) include bolts (5) and connection pins (3). One end of the bolt (5) axially abuts against the clamping flange (1) or the connecting flange (2), and the other end is connected to the connecting pin (3). One end of the connecting pin (3) axially abuts against the connecting flange (2) or the clamping flange (1), and the other end is connected to the bolt (5).

2. The torque limiter according to claim 1, characterized in that: The connecting pin (3) comprises a pin shaft (31) and a connecting head (32) coaxially arranged at the end of the pin shaft (31); the pin shaft (31) is located inside the clamping flange (1) and the connecting flange (2); and the connecting head (32) axially abuts against the clamping flange (1) or the connecting flange (2).

3. The torque limiter according to claim 2, characterized in that: The flange axially abutting the connecting head (32) and the pin shaft (31) adopts a clearance fit, and the other flange and the pin shaft (31) adopt an interference fit.

4. The torque limiter according to claim 2, characterized in that: The bolt (5) and the corresponding flange are axially abutted via a spring washer (7), and the outer diameter of the connecting head (32) is equal to the outer diameter of the spring washer (7).

5. The torque limiter according to claim 4, characterized in that: A boss (321) for abutting against a corresponding flange is provided on the end surface of the connecting head (32), and the outer diameter of the boss (321) is equal to the outer diameter of the spring pad (7).

6. The torque limiter according to any one of claims 2 to 5, characterized in that: A chamfer is provided at one end of the pin shaft (31) away from the connecting head (32).

7. The torque limiter according to any one of claims 1 to 6, characterized in that: A threaded hole (33) is coaxially arranged in the connecting pin (3), and the bolt (5) is adapted to the threaded hole (33).

8. The torque limiter according to claim 7, characterized in that: The threaded hole (33) penetrates the connecting pin (33).

9. The torque limiter according to any one of claims 1 to 8, characterized in that: Adjacent connecting components (6) are arranged alternately in positive and negative directions.

10. An assembly method of a torque limiter according to any one of claims 1 to 9, characterized in that: After the clamping flange (1) and the connecting flange (2) are aligned, the connecting pin (3) is assembled into the clamping flange (1) and the connecting flange (2) from one end by hydraulic means, and the bolt (5) is assembled into the clamping flange (1) and the connecting flange (2) from the other end, and the bolt (5) is threadedly connected to the connecting pin (3).

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