Disc reed type intelligent gasket based on slide rheostat and mounting structure of disc reed type intelligent gasket

Abstract

The utility model discloses a disc reed type intelligent gasket based on a slide rheostat and a mounting structure thereof, each disc reed of the disc reed type intelligent gasket based on the slide rheostat is elastically supported between a flat gasket and a pressure plate, a circuit board is mounted in a fixing ring, and the pressure plate is mounted on the flat gasket. A battery, a slide rheostat, a signal processing module and a signal sending module are integrated on the circuit board, and the pressure plate is connected with a slip sheet of the slide rheostat through a connecting assembly. Even if the pressure plate only generates tiny displacement, the pressure plate can drive the slip sheet to synchronously generate equivalent tiny displacement through the connecting assembly, so that tiny looseness generated after the bolt is installed can be accurately monitored, and the bolt looseness detection device is suitable for application scenes with extremely high requirements on bolt looseness detection precision; and early warning of possible looseness can be realized by monitoring the pressure value of bolt mounting in real time, so that the bolt can be tightened again in advance before the bolt is loosened, and the bolt loosening condition is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent monitoring device technical field, concretely relates to a disc spring piece type intelligent gasket based on sliding rheostat and installation structure thereof. BACKGROUND

[0002] With the development of science and technology, intelligent fastener as a new type of bolt axial force monitoring method also develops and rises. The intelligent fastener integrates the bolt axial force detection device inside, can monitor the health status of key bolt connection structure online, realizes the integration of structure and function. They can be applied to various stages of industrial production, use and maintenance, etc. have long-term economic and social benefits for promoting the development of China's industry, improving the reliability of equipment, reducing major safety accidents, etc.

[0003] Please see the Chinese utility model patent with publication number CN220337260U, which is a kind of intelligent gasket designed by the inventor team of the case, the micro-displacement sensor is triggered by the deformation of disc spring piece, realizes micro-displacement detection, thereby real-time monitoring the loosening condition of bolt installation.

[0004] Although the above-mentioned intelligent gasket has been higher, it can realize real-time detection of smaller loosening, but smaller loosening will only cause very small deformation of disc spring piece, limited by the measurement accuracy of micro-displacement sensor, such very small deformation cannot be captured by micro-displacement sensor, resulting in that the above-mentioned intelligent gasket cannot be applied to the scene with very high requirement for bolt loosening detection accuracy.

[0005] It is urgent to solve the above problems. UTILITY MODEL CONTENT

[0006] In order to solve the technical problem of low detection accuracy of the existing intelligent gasket, the utility model provides a disc spring piece type intelligent gasket based on sliding rheostat and installation structure thereof.

[0007] Its technical scheme is as follows:

[0008] The first aspect of the present application relates to a disc spring piece type intelligent gasket based on a sliding rheostat, comprising a flat gasket and at least one disc spring piece stacked on the flat gasket, the flat gasket being in a disc structure, and the center of the flat gasket having a flat gasket bolt through hole, the center of each disc spring piece having a disc spring piece bolt through hole coaxially arranged with the flat gasket bolt through hole, further comprising a pressure disc in a disc structure, each disc spring piece being elastically supported between the flat gasket and the pressure disc, the center of the pressure disc having a pressure disc bolt through hole coaxially arranged with the flat gasket bolt through hole, the flat gasket, the pressure disc and each disc spring piece being sleeved with a fixing ring for fixing them as a whole, the fixing ring having a circuit board installed therein, the circuit board having a battery, a sliding rheostat, a signal processing module and a signal sending module integrated thereon, the pressure disc being connected with the slider of the sliding rheostat through a connecting assembly, so as to drive the slider of the sliding rheostat to move synchronously.

[0009] The above disc spring piece type intelligent gasket based on a sliding rheostat, in the process of tightening the nut, the pressure disc is forced to compress each disc spring piece by displacement, in the process of loosening the nut, each disc spring piece drives the pressure disc to displace by elastic reset; no matter which of the above cases, even if the pressure disc only has a very small displacement, it will also drive the slider to have an equal amount of small displacement synchronously through the connecting assembly, thereby causing the change of the resistance value of the sliding rheostat itself, and being monitored by the signal processing module in real time, and through the conversion relationship, the real-time monitoring of the pressure value currently borne by the intelligent gasket can be realized, therefore, compared with the existing intelligent gasket, the present intelligent gasket not only can accurately monitor the very small loosening of the bolt after installation, is suitable for application scenarios with very high bolt loosening detection accuracy, improves the versatility of the intelligent gasket, but also can monitor the pressure value of the bolt installation in real time, realizes the early warning of possible loosening, so as to tighten the bolt again in advance before the bolt loosens, avoids the occurrence of bolt loosening.

[0010] In some embodiments, the connecting assembly comprises an extension arm extending radially from the circumferential outer edge of the pressure disc towards the sliding rheostat, and a transition block mounted on the outer end of the extension arm, the transition block being connected with the slider of the sliding rheostat.

[0011] In some embodiments, the circumferential outer wall of the fixing ring is integrally formed with an electrical element mounting box, one side of the electrical element mounting box being provided with a component inlet and outlet, the component inlet and outlet being detachably covered with a box cover for sealing the electrical element mounting box, the circumferential side wall of the fixing ring being provided with a displacement opening matched with the extension arm, the circuit board being mounted on the inner wall of the side of the electrical element mounting box opposite to the displacement opening, and the slider of the sliding rheostat being opposite to the displacement opening.

[0012] In some embodiments, the fixing ring is surrounded by two sub-mounting rings in a semi-circular ring structure, the two sides of the sub-mounting rings in the width direction are provided with semi-circular positioning ribs extending radially inward, a circular flat gasket slot matched with the semi-circular positioning ribs is formed on the circumferential outer wall of the flat gasket, a circular pressure plate slot matched with the semi-circular positioning ribs is formed on the circumferential outer wall of the pressure plate, and the two semi-circular positioning ribs of the two sub-mounting rings are respectively clamped into the flat gasket slot and the pressure plate slot, and the two ends of the two sub-mounting rings are locked by corresponding first locking members.

[0013] In some embodiments, at least one mounting boss is protruded from the two ends of one of the sub-mounting rings, a first locking pin hole penetrating in the width direction of the sub-mounting ring is formed in the mounting boss, and mounting grooves matched with the corresponding mounting bosses are respectively formed in the two ends of the other sub-mounting ring, second locking pin holes penetrating in the width direction of the sub-mounting ring are formed in the two side walls of the mounting grooves, the first locking members are cylindrical pins, each mounting boss is embedded into the corresponding mounting groove, so that the first locking pin holes and the second locking pin holes at the adjacent ends of the two sub-mounting rings are communicated to form a first cylindrical pin hole matched with the first locking member, and each first locking member is locked in the corresponding first cylindrical pin hole in an interference fit.

[0014] In some embodiments, a second locking member which is a cylindrical pin is further included, a third locking pin hole penetrating in the radial direction is formed in one of the sub-mounting rings, a fourth locking pin hole communicated with the third locking pin hole is formed in the circumferential outer wall of the flat gasket, the third locking pin hole and the fourth locking pin hole are communicated to form a second cylindrical pin hole matched with the second locking member, and the second locking member is locked in the second cylindrical pin hole in an interference fit.

[0015] In some embodiments, the disc spring pieces are all in a conical ring structure with the diameter gradually decreasing away from the flat gasket, and a sealing ring annular groove is formed in the circumferential outer wall of each disc spring piece, and a sealing ring is mounted in the sealing ring annular groove, and each sealing ring is in an interference fit with the circumferential inner wall of the two sub-mounting rings.

[0016] The second aspect of the present application relates to the mounting structure of the disc spring piece type intelligent gasket based on the sliding rheostat, and further includes a first connected member, a second connected member, a bolt and a nut, the shank of the bolt sequentially passes through the first connected member, the second connected member, the flat gasket bolt through hole of the flat gasket, the disc spring piece bolt through hole of each disc spring piece and the pressure plate bolt through hole of the pressure plate, the nut is tightened from the outer end of the shank, so that the first connected member, the second connected member, the flat gasket, each disc spring piece and the pressure plate are clamped between the head of the nut and the bolt.

[0017] The installation structure of the disc spring piece type intelligent gasket based on the sliding rheostat has all the advantages of the disc spring piece type intelligent gasket based on the sliding rheostat. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic view of an installation structure of a disc spring piece type intelligent gasket based on a sliding rheostat;

[0019] Figure 2 FIG. 2 is a sectional view of the installation structure of the disc spring piece type intelligent gasket based on the sliding rheostat;

[0020] Figure 3 FIG. 3 is a structural schematic view of the disc spring piece type intelligent gasket based on the sliding rheostat;

[0021] Figure 4 FIG. 4 is a structural schematic view of one of the sub-mounting rings;

[0022] Figure 5 FIG. 5 is a structural schematic view of another sub-mounting ring;

[0023] Figure 6 FIG. 6 is a structural schematic view of the pressure plate;

[0024] Figure 7 FIG. 7 is a structural schematic view of the flat gasket;

[0025] Figure 8 FIG. 8 is a structural schematic view of the disc spring piece;

[0026] Figure 9 FIG. 9 is a structural schematic view of the circuit board. DETAILED DESCRIPTION

[0027] The utility model will be further described below in combination with the embodiments and the drawings.

[0028] Embodiment 1

[0029] As shown in Figures 2-9 FIG. 1, a disc spring piece type intelligent gasket based on a sliding rheostat mainly comprises a flat gasket 1, a pressure plate 4, a fixing ring 3 and at least one disc spring piece 2, each disc spring piece 2 is stacked between the flat gasket 1 and the pressure plate 4, the fixing ring 3 is sleeved outside the flat gasket 1, each disc spring piece 2 and the pressure plate 4 in the circumferential direction, and the flat gasket 1, each disc spring piece 2 and the pressure plate 4 are fixed as a whole.

[0030] Among them, the flat gasket 1 and the pressure plate 4 are both disc structures, the flat gasket 1 has a flat gasket bolt through hole 1a at the center position, the pressure plate 4 has a pressure plate bolt through hole 4b coaxially arranged with the flat gasket bolt through hole 1a at the center position, usually, the diameters of the flat gasket bolt through hole 1a and the pressure plate bolt through hole 4b are consistent.

[0031] The structures of the disc spring pieces 2 are consistent, and each disc spring piece 2 is a conical ring structure, and each disc spring piece 2 is elastically supported between the flat pad 1 and the pressure plate 4 in a stacking manner. Specifically, the disc spring piece 2 has the following three stacking manners:

[0032] The disc spring piece 2 stacking manner one: please refer to Figure 2 The disc spring piece 2 is a conical ring structure with a diameter gradually decreasing away from the flat pad 1.

[0033] The disc spring piece 2 stacking manner two: the disc spring piece 2 is a conical ring structure with a diameter gradually decreasing away from the flat pad 1.

[0034] The disc spring piece 2 stacking manner three: part of the disc spring pieces 2 are conical ring structures with a diameter gradually decreasing away from the flat pad 1, and the other part of the disc spring pieces 2 are conical ring structures with a diameter gradually decreasing away from the flat pad 1, and the structures of any two adjacent disc spring pieces 2 are opposite.

[0035] No matter which of the above manners is adopted, the disc spring piece 2 has a disc spring bolt through hole 2a coaxially arranged with the flat pad bolt through hole 1a at the center position of the disc spring piece 2, the flat pad 1, the pressure plate 4 and the disc spring pieces 2 are provided with a fixing ring 3 for fixing them as a whole, and since the fixing ring 3 limits the radial movement of the flat pad 1, the pressure plate 4 and the disc spring pieces 2, the disc spring pieces 2 can only be acted on by the axial force of the pressure plate 4 to deform. During the tightening of the nut 13, the pressure plate 4 forces the disc spring pieces 2 to compress by displacement, and during the loosening of the nut 13, the disc spring pieces 2 drive the pressure plate 4 to displace by elastic reset.

[0036] In this embodiment, the fixing ring 3 is provided with a circuit board 5, the circuit board 5 is integrated with a battery 5d, a sliding rheostat 5a, a signal processing module 5b and a signal sending module 5c, the pressure plate 4 is connected with the slider 5a1 of the sliding rheostat 5a through a connecting assembly, so that the slider 5a1 of the sliding rheostat 5a can move synchronously with the pressure plate 4, that is, the sliding direction of the slider 5a1 is parallel to the axial direction of the pressure plate 4.

[0037] Therefore, even if the pressure plate 4 only has a very small displacement, it will also drive the slider 5a1 to have an equal amount of small displacement synchronously through the connecting assembly, so as to cause the change of the resistance value of the sliding rheostat 5a itself, and the change is monitored by the signal processing module 5b in real time, and through the conversion relationship, the real-time monitoring of the current pressure value of the intelligent gasket can be realized, and the detection value is sent to the outside in real time through the signal sending module 5c. In addition, the battery 5d is used to supply power to the sliding rheostat 5a, the signal processing module 5b and the signal sending module 5c.

[0038] Therefore, compared with the existing intelligent gaskets, the intelligent gasket can not only accurately monitor the extremely slight loosening of the bolt after installation, is suitable for application scenarios with extremely high bolt loosening detection accuracy requirements, and improves the universality of the intelligent gasket, but also can realize early warning of possible loosening by monitoring the pressure value of bolt installation in real time, so that the bolt can be tightened again in advance before loosening occurs, thereby avoiding the occurrence of bolt loosening.

[0039] Please refer to Figure 2 , Figure 4 and Figure 6 , the connecting assembly includes an extension arm 4a extending from the circumferential outer edge of the pressure disc 4 radially towards the sliding rheostat 5a, and a transition block 9 mounted at the outer end of the extension arm 4a, and the transition block 9 is connected with the sliding sheet 5a1 of the sliding rheostat 5a. That is, the extension arm 4a drives the sliding sheet 5a1 to move synchronously with it through the transition block 9, and the direct drive mode has extremely high accuracy, and even slight movement can be reflected by the displacement of the sliding sheet 5a1 of the sliding rheostat 5a, thereby changing the resistance value of the sliding rheostat 5a itself. It should be pointed out that the extension arm 4a can also be directly connected with the sliding sheet 5a1.

[0040] Further, please refer to Figures 1-4 , the circumferential outer wall of the fixed ring 3 is integrally formed with an electrical element mounting box 3a9, and the integral forming mode has high structural strength. Moreover, one side of the electrical element mounting box 3a9 is provided with a component inlet and outlet 3a91, and a box cover 3a7 for sealing the electrical element mounting box 3a9 is detachably covered on the component inlet and outlet 3a91, so as to facilitate the installation and maintenance of the circuit board 5. In the embodiment, the box cover 3a7 and the electrical element mounting box 3a9 are connected by a plurality of screws, which is simple and reliable, and has good sealing performance.

[0041] The circumferential side wall of the fixed ring 3 is provided with a clearance opening 3a8 matched with the extension arm 4a, the circuit board 5 is installed on the inner wall of the side of the electrical element mounting box 3a9 opposite to the clearance opening 3a8, and the sliding sheet 5a1 of the sliding rheostat 5a is opposite to the clearance opening 3a8. Therefore, the extension arm 4a extends into the electrical element mounting box 3a9 through the clearance opening 3a8, and then is connected with the sliding sheet 5a1 through the transition block 9, which is simple and reliable, and has good sealing performance.

[0042] Please refer to Figures 2-8 , the fixed ring 3 is formed by two sub-mounting rings 3a in a semi-circular ring structure, and the two ends of the two sub-mounting rings 3a are locked by corresponding first locking members 6, so that the two sub-mounting rings 3a jointly form a circular ring structure capable of fixing the flat gasket 1, the pressure disc 4 and each disc spring sheet 2 as a whole.

[0043] Specifically, the two outer edges of the sub-mounting ring 3a in the width direction are each provided with a semicircular ring positioning rib 3a1 extending radially inward, i.e., the semicircular ring positioning rib 3a1 is in a semicircular ring structure. The circumferential outer wall of the flat pad 1 is recessed to form a ring of flat pad clamping grooves 1b adapted to the semicircular ring positioning rib 3a1, i.e., the flat pad clamping groove 1b is a circular ring-shaped groove. The circumferential outer wall of the pressure plate 4 is recessed to form a ring of pressure plate clamping grooves 4c adapted to the semicircular ring positioning rib 3a1, i.e., the pressure plate clamping groove 4c is also a circular ring-shaped groove. After the two semicircular ring positioning ribs 3a1 of the two sub-mounting rings 3a are clamped into the flat pad clamping groove 1b and the pressure plate clamping groove 4c respectively, the positioning of the flat pad 1, the pressure plate 4 and the disc spring pieces 2 is achieved, and then the two ends of the two sub-mounting rings 3a are locked by the corresponding first locking members 6, so as to fix the flat pad 1, the pressure plate 4 and the disc spring pieces 2 as a whole, thereby ensuring the convenience of assembly and the stability and reliability of the structure, and at the same time, such a structure has good waterproof effect.

[0044] In the present embodiment, the two ends of one of the sub-mounting rings 3a are each provided with at least one mounting boss 3a2, and the two ends of the other sub-mounting ring 3a are each recessed to form a mounting recess 3a4 adapted to the corresponding mounting boss 3a2. It should be noted that one of the sub-mounting rings 3a can also be provided with a mounting boss 3a2 and a mounting recess 3a4 at its two ends, and the other sub-mounting ring 3a can also be provided with a mounting boss 3a2 and a mounting recess 3a4 at its two ends.

[0045] Therefore, the mounting bosses 3a2 are respectively embedded in the corresponding mounting recesses 3a4, thereby ensuring the coarse positioning of the two sub-mounting rings 3a, which is simple, reliable and easy to assemble.

[0046] At this time, the mounting boss 3a2 is provided with a first locking pin hole 3a3 penetrating in the width direction of the sub-mounting ring 3a, and the two side walls of the mounting recess 3a4 are each provided with a second locking pin hole 3a5 penetrating in the width direction of the sub-mounting ring 3a. The first locking member 6 is a cylindrical pin, and one end thereof can be provided with a one-pronged or cross-shaped opening for easy assembly. The mounting bosses 3a2 are respectively embedded in the corresponding mounting recesses 3a4, so that the first locking pin holes 3a3 and the second locking pin holes 3a5 at the adjacent ends of the two sub-mounting rings 3a are in communication to form a first cylindrical pin hole adapted to the first locking member 6, and the first locking member 6 is locked in the corresponding first cylindrical pin hole in an interference fit, thereby ensuring the reliable connection of the two sub-mounting rings 3a. Specifically, the first locking member 6 is pressed into the corresponding first cylindrical pin hole by a vice, which is simple to operate.

[0047] Further, in order to further improve the reliability of the installation of the fixing ring 3, a second locking member 7 is further provided, which is a cylindrical pin, one end of which can be provided with a one-word or cross opening for easy assembly. One of the sub-mounting rings 3a is provided with a third locking pin hole 3a6 which penetrates in the radial direction. The circumferential outer wall of the flat pad 1 is provided with a fourth locking pin hole 1c which communicates with the third locking pin hole 3a6. The third locking pin hole 3a6 and the fourth locking pin hole 1c communicate to form a second cylindrical pin hole which is matched with the second locking member 7. The second locking member 7 is locked in the second cylindrical pin hole in an interference fit, thereby further improving the locking reliability of the fixing ring 3 and avoiding radial and axial displacement of the fixing ring 3 relative to the flat pad 1, the pressure plate 4 and the disc spring pieces 2. Specifically, the second locking member 7 is pressed into the corresponding second cylindrical pin hole with a vice, which is simple to operate.

[0048] Please refer to Figure 2 and Figure 8 The circumferential outer wall of each disc spring piece 2 is recessed to form a circle of sealing ring annular grooves 2c, and each sealing ring annular groove 2c is mounted with a sealing ring 8. Each sealing ring 8 is in interference fit with the circumferential inner wall of the two sub-mounting rings 3a, thereby effectively sealing the gap between the disc spring piece 2 and the fixing ring 3, preventing rainwater from flowing into the electrical component mounting box 3a9 through the displacement opening 3a8, thereby protecting the circuit board 5 and ensuring waterproof performance.

[0049] It should be pointed out that the sealing ring 8 is preferably an O-shaped sealing ring, which is low in cost and good in waterproof sealing performance. The material of the sealing ring 8 can be common elastic sealing materials such as silica gel and rubber.

[0050] Embodiment 2:

[0051] Please refer to Figure 1 and Figure 2 A mounting structure of a disc spring piece type intelligent gasket based on a sliding rheostat further includes a first connected member 10, a second connected member 11, a bolt 12, a nut 13 and the disc spring piece type intelligent gasket based on a sliding rheostat of embodiment 1. The shank part 12a of the bolt 12 passes through the first connected member 10, the second connected member 11, the flat pad bolt through hole 1a of the flat pad 1, the disc spring piece bolt through hole 2a of each disc spring piece 2 and the pressure plate bolt through hole 4b of the pressure plate 4 in sequence, and then the nut 13 is tightened from the outer end of the shank part 12a, so that the first connected member 10, the second connected member 11, the flat pad 1, each disc spring piece 2 and the pressure plate 4 are clamped between the nut 13 and the head part 12b of the bolt 12. Among them, the flat pad 1 of the disc spring piece type intelligent gasket based on a sliding rheostat of embodiment 1 abuts against the surface of the second connected member 11 away from the first connected member 10, and the pressure plate 4 abuts against the nut 13, thereby locking the first connected member 10 and the second connected member 11.

[0052] During the installation process, the signal processing module 5b can monitor the locking pressure of the bolt 12 and the nut 13 on the first connected piece 10 and the second connected piece 11 in real time by monitoring the resistance value change of the sliding rheostat 5a, thereby ensuring the accuracy of the installation. After the installation is completed, the signal processing module 5b can not only realize the early warning of the possible loosening by monitoring the pressure value of the bolt installation in real time, but also can timely alarm the loosened bolt by monitoring the resistance value change of the sliding rheostat 5a.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present application, and those skilled in the art can make various similar expressions under the inspiration of the present application without deviating from the purpose and claims of the present application. Such changes fall within the scope of the present application.

Claims

1. A disc spring piece type smart gasket based on a sliding rheostat, comprising a flat gasket and at least one disc spring piece stacked on the flat gasket, the flat gasket having a disc shape structure, and the flat gasket having a flat gasket bolt through hole at a center position of the flat gasket, the disc spring piece having a disc spring piece bolt through hole coaxially arranged with the flat gasket bolt through hole at a center position of the disc spring piece, characterized in that, The connecting assembly comprises an extension arm extending radially from the circumferential outer edge of the pressing disc towards the slide rheostat, and a transition block mounted on the outer end of the extension arm, which is connected with the slide of the slide rheostat.

2. The slide rheostat based belleville spring smart washer of claim 1, wherein, The circumferential side wall of the fixing ring is provided with an accommodation opening matched with the extension arm, the circuit board is mounted on the inner wall of the side of the electrical element mounting box opposite to the accommodation opening, and the slide of the slide rheostat is opposite to the accommodation opening.

3. The slip rheostat based belleville spring smart washer of claim 2, wherein, The two ends of one of the sub-mounting rings are each provided with at least one mounting boss, and the mounting boss is provided with a first lock pin hole penetrating in the width direction of the sub-mounting ring.

4. The slip rheostat based belleville spring smart washer of claim 1, wherein, The two ends of the other sub-mounting ring are each provided with a mounting groove matched with the corresponding mounting boss, and the two side groove walls of the mounting groove are each provided with a second lock pin hole penetrating in the width direction of the sub-mounting ring.

5. The slip rheostat based belleville spring smart washer of claim 4, wherein, The second locking member is a cylindrical pin, one of the sub-mounting rings is provided with a third lock pin hole penetrating in the radial direction, the circumferential outer wall of the flat pad is provided with a fourth lock pin hole communicated with the third lock pin hole, the third lock pin hole and the fourth lock pin hole are communicated to form a second cylindrical pin hole matched with the second locking member, and the second locking member is locked in the corresponding second cylindrical pin hole in an interference fit.

6. The slip rheostat based belleville spring smart washer of claim 5, wherein, ​ 7. The slip rheostat based belleville spring smart washer of claim 4, wherein, The disc spring pieces are all conical ring structures with diameters gradually decreasing away from the flat pad, and a circle of sealing ring annular grooves are recessed on the circumferential outer walls of the disc spring pieces, and sealing rings are installed in the sealing ring annular grooves, and the sealing rings are in interference fit with the circumferential inner walls of the two sub-mounting rings.

8. A mounting structure of the slide rheostat-based disc spring piece type smart gasket according to any one of claims 1 to 7, characterized by, Further comprising a first connected member, a second connected member, a bolt and a nut, the screw rod of the bolt passes through the first connected member, the second connected member, the flat pad bolt through hole of the flat pad, the disc spring piece bolt through hole of each disc spring piece and the pressure plate bolt through hole of the pressure plate in sequence, and then the nut is tightened from the outer end of the screw rod to the inside, so that the first connected member, the second connected member, the flat pad, each disc spring piece and the pressure plate are clamped between the nut and the head of the bolt.

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