Reset mechanism and reset method for torque overload protection device

Abstract

The invention relates to a reset mechanism and a reset method, in particular to a reset mechanism and a reset method for a torque overload protection device. The problem that in the prior art, when a torque overload protection device is reset, the working condition is complex, and risks exist on the safety of operators and the reset timeliness is solved. The device comprises a fixed flange, a sliding sleeve and a reset flange which are coaxially arranged. The sliding sleeve and the reset flange are both arranged on the fixed flange in a sleeving mode, the reset flange is fixedly connected with the ball head thrust rod, and an air chamber exists between the sliding sleeve and the fixed flange. The fixed flange is fixedly connected to the base, and a plurality of sets of guide mechanisms are installed on the end face of the fixed flange. The device is simple in structure and easy to operate, workers do not need to go to an equipment site for operation, the safety risk of the operators is reduced, meanwhile, the timeliness of power recovery of the mechanical transmission system is improved, and time is saved for power transmission recovery of transmission shaft systems in industrial production and various special industries. The invention belongs to the technical field of overload protection couplings.

Description

Technical Field

[0001] The invention relates to a reset mechanism and a reset method, in particular to a reset mechanism and a reset method for a torque overload protection device, belonging to the technical field of overload protection couplings. Background Art

[0002] Couplings play an indispensable role in industrial development. They can not only connect and transmit power, but also compensate for mechanical transmission shafts and reduce vibration and noise, thereby improving the reliability and service life of power system equipment. With the rapid development of electric propulsion power systems in modern industrial development, the frequency of motor use is bound to increase significantly. However, motors will inevitably fail during operation, causing instantaneous torque surges that far exceed the designed limit torque, which will cause extremely serious damage to the transmission system.

[0003] To this end, the common solution is to design an overload protection device. For example, the patents with publication numbers CN117722448A and WO2016000272A1 both propose a shear pin structure. When the transmission system transmits a torque that exceeds the shear pin design torque, the shear pin automatically cuts off to interrupt the transmission of power. However, the disadvantages of the above two solutions are that the torque accuracy of the overload protection is low and the reset time of replacing the shear pin is long. For example, the patent with publication number CN109595268A discloses a large torque multi-friction super-torque protection structure. Its technical solution transmits torque by utilizing the mutual friction between multiple layers of dual friction plates. After super-torque, the friction plates slip against each other to achieve power interruption between the active end and the driven end. The advantage is that the reset after super-torque does not require additional operation and can continue to work, but its disadvantage is that the friction plate slips and there are wear and heat problems.

[0004] In response to the above problems, the patent with publication number CN203627578U discloses a pin-type torque overload protection device. The technical solution of this patent utilizes the cooperation between the spherical surface and the inner conical surface to transmit torque, and realizes torque transmission and disengagement by compressing the axial force of the butterfly spring and the axial component of the torque on the conical surface of the tapered hole block. The advantages of this pin-type structure are high disengagement torque accuracy, fast disengagement speed and no residual torque. It is currently widely used, but the disadvantage is that a certain axial force needs to be provided to push the spherical surface to a position that cooperates with the inner conical surface during resetting; however, for the manual resetting method, there are certain risks to the safety of the operator and the timeliness of the resetting in complex environments such as small on-site operating space, equipment operation that cannot be shut down, and oil and water leakage.

[0005] In summary, how to propose a reset mechanism and a reset method for the above-mentioned technical problems has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a reset mechanism for a torque overload protection device.

[0007] The technical solution of the present invention is: a reset mechanism for a torque overload protection device, comprising an output flange and an input flange, wherein a plurality of ejector-type torque overload couplings are mounted on the end surface of the output flange in a circular array.

[0008] The thimble-type torque overload coupling comprises a ball head thrust rod, a disc spring, a conical ring, a sleeve, an end cover and a plurality of wedge-shaped sliders.

[0009] One end of the sleeve is fixedly connected to the output flange, and the other end of the sleeve is installed with an end cover.

[0010] The ball thrust rod, disc spring, wedge-shaped slider and conical ring are all arranged in the sleeve, and the displacement of the ball thrust rod in the sleeve is L1.

[0011] The ball end of the ball thrust rod abuts against the positioning groove on the input flange; the disc spring and the conical ring are sequentially mounted on the ball thrust rod, and the two ends of the disc spring abut against the conical ring and the end cover respectively.

[0012] The bottom of the sleeve is provided with a first annular conical surface, and both end surfaces of the wedge-shaped sliding block are respectively against the first annular conical surface and the conical ring.

[0013] Furthermore, it also includes: a coaxially arranged fixed flange, a sliding sleeve and a reset flange.

[0014] The sliding sleeve and the reset flange are both sleeved on the fixed flange, the reset flange is fixedly connected to the ball head thrust rod, an air chamber exists between the sliding sleeve and the fixed flange, and the maximum displacement of the sliding sleeve on the fixed flange is L1.

[0015] The fixed flange is fixedly connected to the base, and a plurality of guide mechanisms are installed on the end surface of the fixed flange in a circular array manner.

[0016] The guide mechanism includes a guide screw, a compression spring and a guide sleeve.

[0017] The guide sleeve is fixedly connected with the fixed flange, the compression spring is sleeved on the guide screw, and the guide screw is connected with the sliding sleeve after passing through the guide sleeve.

[0018] The present invention also provides a method for resetting a torque overload protection device, which is specifically performed in the following steps:

[0019] Step 1: First, ensure that there is no air pressure in the air chamber so that the sliding sleeve and the positioning shaft shoulder are against each other;

[0020] Step 2: Fix the fixed flange to the base and ensure that the distance between the sliding sleeve and the reset flange is maintained at L1;

[0021] Step 3: First, when the torque input by the input flange exceeds the rated torque of the ejector-type torque overload coupling, the ball head thrust rod and the reset flange move along the axis of the sleeve by a displacement of L1, and the ball head end no longer abuts against the positioning groove on the input flange, so as to cut off the torque transmission between the input flange and the output flange. After the torque transmission is cut off, the power system of the shaft system is shut down, and the shaft system stops running;

[0022] Then, the turning machine on the shaft system turns the input flange. At the same time, compressed air is introduced into the air chamber to make the sliding sleeve push the reset flange and the ball head thrust rod to achieve the ball head end and the positioning groove to abut against each other again. When the input flange drives the output flange to rotate, the turning machine stops turning.

[0023] Finally, the control system of the shaft system adjusts the torque input by the power system so that the input torque is less than the rated torque of the ejector-type torque overload coupling;

[0024] Step 4: The air chamber is depressurized. The sliding sleeve is pressed against the positioning shaft shoulder under the elastic force of the compression spring. The compressed air is discharged from the air chamber, and the power system of the shaft system is started, so that the shaft system resumes operation.

[0025] Compared with the prior art, the present invention has the following effects:

[0026] 1. The present invention has a simple structure and is easy to operate. The entire resetting process is fully automatic and does not require personnel to operate on site, thereby reducing the safety risk of operators and improving the timeliness of restoring power in the mechanical transmission system, saving time for restoring power transmission in the transmission shaft system of industrial production and various special industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the ejector-type torque overload coupling 4 in the present invention when transmitting torque and cutting off torque;

[0029] Figure 3 is an axonometric view of the fixed flange 36, the sliding sleeve 38 and the reset flange 311 of the present invention;

[0030] Figure 4 is a cross-sectional view of the present invention;

[0031] Figure 5 yes Figure 4 Partial enlarged view of point Ⅰ

[0032] Figure 6It is a cross-sectional view of the fixed flange 36 and the sliding sleeve 38 of the present invention.

[0033] In the figure: 2, output flange; 4, ejector-type torque overload coupling; 410, ball thrust rod; 420, disc spring; 430, wedge slider; 440, tapered ring; 450, sleeve; 460, end cover; 5, input flange; 31, guide screw; 32, gasket; 33, compression spring; 34, guide sleeve; 36, fixed flange; 37, first sealing ring; 38, sliding sleeve; 310, pneumatic joint; 311, reset flange; 313, second sealing ring; 315, third sealing ring. DETAILED DESCRIPTION

[0034] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] Specific implementation method 1: Combination Figures 1 to 6 The present embodiment is described as a reset mechanism for a torque overload protection device, comprising an output flange 2 and an input flange 5, and a plurality of ejector-type torque overload couplings 4 are mounted on the end surface of the output flange 2 in a circular array.

[0036] The ejector-type torque overload coupling 4 includes a ball-end thrust rod 410 , a disc spring 420 , a conical ring 440 , a sleeve 450 , an end cover 460 and a plurality of wedge-shaped sliders 430 .

[0037] One end of the sleeve 450 is fixedly connected to the output flange 2 , and the other end of the sleeve 450 is installed with an end cover 460 .

[0038] The ball-end thrust rod 410 , the disc spring 420 , the wedge-shaped slider 430 and the conical ring 440 are all arranged in the sleeve 450 , and the displacement of the ball-end thrust rod 410 in the sleeve 450 is L1 .

[0039] A second annular cone surface for guiding the wedge-shaped slider 430 is provided on the outer circumferential surface of the ball head thrust rod 410. The ball head thrust rod 410 passes through the sleeve 450, and the ball head end of the ball head thrust rod 410 abuts against the positioning groove on the input flange 5; the disc spring 420 and the conical ring 440 are sequentially mounted on the ball head thrust rod 410, and the two ends of the disc spring 420 abut against the conical ring 440 and the end cover 460 respectively.

[0040] The bottom of the sleeve 450 is provided with a first annular conical surface, and the two end surfaces of the wedge slider 430 are respectively against the first annular conical surface and the conical ring 440. The wedge slider 430 is arranged around the ball head thrust rod 410 in a circular array, and the wedge slider 430 can approach or move away from the axis of the ball head thrust rod 410.

[0041] It is characterized by further comprising: a coaxially arranged fixing flange 36 , a sliding sleeve 38 and a reset flange 311 .

[0042] The sliding sleeve 38 and the reset flange 311 are both sleeved on the fixed flange 36. The reset flange 311 is fixedly connected to the ball head thrust rod 410. There is an air chamber between the sliding sleeve 38 and the fixed flange 36, and the maximum displacement of the sliding sleeve 38 on the fixed flange 36 is L1.

[0043] The fixed flange 36 is fixed to the base by a plurality of bolts, and the angle θ between the bolts is 360° / N, where N is the number of bolts. A plurality of guide mechanisms are installed on the end surface of the fixed flange 36 in a circular array.

[0044] The guide mechanism includes a guide screw 31 , a compression spring 33 and a guide sleeve 34 .

[0045] The guide sleeve 34 is fixedly connected to the fixed flange 36, and the contact surfaces of the guide sleeve 34 and the fixed flange 36 are coated with sealant. The compression spring 33 is sleeved on the guide screw 31. The pre-compression amount of the compression spring 33 when not subjected to external force is L0. The guide screw 31 passes through the guide sleeve 34 and is connected to the sliding sleeve 38. After the guide screw 31 is installed in the threaded hole on the sliding sleeve 38, the remaining thread length in the threaded hole is L4, and L4>L0. This arrangement ensures that the pre-compression amount can be achieved by relying on the rotation and length of the guide screw 31, and is easy to adjust when the pre-compression amount changes.

[0046] The ejector-type torque overload coupling 4 in this embodiment is a prior art, specifically an ejector-type torque overload protection device disclosed in Publication No. CN203627578U.

[0047] Furthermore, a first sealing ring 37 is installed on the outer circumferential surface of the fixed flange 36. The distance between the first sealing ring 37 and the end face of the fixed flange 36 facing the guide sleeve 34 is L3, and L3>L1. This arrangement prevents the first sealing ring 37 from being exposed to the air and causing air chamber deflation, thereby avoiding the sliding sleeve 38 from failing to reset.

[0048] Furthermore, a third sealing ring 315 is installed on the inner circumferential surface of the sliding sleeve 38 .

[0049] Furthermore, a second sealing ring 313 is installed on the inner circumference of the bottom of the guide sleeve 34, so as to prevent the gas in the air chamber from leaking.

[0050] Furthermore, a positioning shoulder is integrally provided on the fixed flange 36, and the positioning shoulder is arranged in the air chamber, and the axial length of the positioning shoulder is L2. With such arrangement, when there is no air pressure in the air chamber, the sliding sleeve 38 is abutted against the positioning shoulder under the elastic force of the compression spring 33, so that the axial length of the air chamber is maintained at L2. Furthermore, the pre-compression amount L0 of the compression spring 33 is 2 to 3 mm. The setting of the pre-compression amount L0 is to ensure that the sliding sleeve 38 is reliably abutted against the positioning shoulder, and also to facilitate the filling of gas into the air chamber.

[0051] Furthermore, the pre-compression amount L0 generates a pre-pressure F 预压 =kL0>nf0(f1+f2+f3+f4), where:

[0052] k: is the stiffness of the compression spring 33;

[0053] f1: friction force of the first sealing ring 37;

[0054] f2: friction force of the second sealing ring 313;

[0055] f3: friction force of the third sealing ring 315;

[0056] f4: friction force of the sliding sleeve 38;

[0057] f0: friction coefficient, ranging from 0.1 to 0.15;

[0058] n: safety factor, range from 2 to 3.

[0059] Furthermore, the maximum spring force provided by the compression spring 33 when working is F 弹簧 =k(L0+L1), where:

[0060] k: is the stiffness of the compression spring 33;

[0061] L0: is the pre-compression amount of the compression spring 33;

[0062] L1: maximum displacement of the sliding sleeve 38 on the fixed flange 36 .

[0063] Furthermore, the axial force F generated by the compressed air in the air chamber 气室 =Pπ(R 2 -r 2 ), F 气室 The sliding sleeve 38 can be pushed, and the sliding sleeve 38 pushes the reset flange 311 and the ball head thrust rod 410 to achieve the ball head end and the positioning groove to abut against each other again, wherein:

[0064] P: is the pressure of compressed air;

[0065] R: is the outer diameter of the air chamber;

[0066] r: The diameter inside the air chamber.

[0067] Specific implementation method 2: Combination Figure 4 To explain this embodiment, a vent threaded hole is formed on the sliding sleeve 38, the vent threaded hole is connected to the air chamber, and a pneumatic joint 310 is installed on the vent threaded hole. Other components and connection relationships are the same as those in the first embodiment.

[0068] Specific implementation method three: Combination Figure 4 and Figure 5 To explain this embodiment, the guide mechanism in this embodiment further includes a washer 32, which is mounted on the guide screw 31, and the two ends of the compression spring 33 respectively abut against the washer 32 and the bottom of the guide sleeve 34. Other components and connection relationships are the same as those of the first or second embodiment.

[0069] Specific implementation method four: Combination Figures 1 to 6 The present embodiment is described. A method for resetting a torque overload protection device in the present embodiment is specifically performed in the following steps:

[0070] Step 1: First, ensure that there is no air pressure in the air chamber so that the sliding sleeve 38 abuts against the positioning shoulder;

[0071] Step 2: fix the fixing flange 36 to the base, and ensure that the distance between the sliding sleeve 38 and the reset flange 311 is maintained at L1;

[0072] Step 3: First, when the torque input by the input flange 5 exceeds the rated torque of the ejector-type torque overload coupling 4, the ball head thrust rod 410 and the reset flange 311 move along the axis of the sleeve 450 by a displacement of L1, and the ball head end no longer abuts against the positioning groove on the input flange 5, so as to cut off the torque transmission between the input flange 5 and the output flange 2. After the torque transmission is cut off, the power system of the shaft system is shut down, and the shaft system stops running;

[0073] Then, the turning machine on the shaft system turns the input flange 5. At the same time, compressed air is introduced into the air chamber to make the sliding sleeve 38 push the reset flange 311 and the ball head thrust rod 410 to achieve the ball head end and the positioning groove to abut against each other again. When the input flange 5 drives the output flange 2 to rotate, the turning machine stops turning.

[0074] Finally, the control system of the shaft system adjusts the torque input by the power system so that the input torque is less than the rated torque of the ejector-type torque overload coupling 4;

[0075] Step 4: The air chamber is depressurized. The sliding sleeve 38 abuts against the positioning shaft shoulder under the elastic force of the compression spring 33, and the compressed air is discharged from the air chamber. The power system of the shaft system is started, and the shaft system resumes operation.

[0076] How it works

[0077] Combination Figures 1 to 6 The working principle of the present invention is described:

[0078] When the torque input by the input flange 5 is lower than the rated torque of the ejector-type torque overload coupling 4 , the disc spring 420 presses the ball end of the ball thrust rod 410 into the positioning groove on the input flange 5 through the wedge-shaped slider 430 , and the torque of the input flange 5 is transmitted to the output flange 2 .

[0079] When the torque input by the input flange 5 exceeds the rated torque of the ejector-type torque overload coupling 4,

[0080] The ball head thrust rod 410 tends to move toward the sliding sleeve 38. Under the guidance of the second annular cone, the wedge slider 430 moves away from the axis of the ball head thrust rod 410, and finally the ball head thrust rod 410 and the reset flange 311 move along the axis of the sleeve 450 by a displacement of L1. The ball head end no longer abuts against the positioning groove on the input flange 5 to cut off the torque transmission between the input flange 5 and the output flange 2. At this time, an external control system is required to adjust the torque input by the input flange 5 so that the input torque is less than the rated torque of the pin-type torque overload coupling 4.

[0081] Because the ball head thrust rod 410 is fixedly connected to the reset flange 311, and the sliding sleeve 38 and the reset flange 311 are both mounted on the fixed flange 36, when compressed air is introduced into the air chamber, the cavity of the air chamber becomes larger, and then the compressed air pushes the sliding sleeve 38, and the sliding sleeve 38 pushes the reset flange 311 and the ball head thrust rod 410, so that the ball head end and the positioning groove are again against each other.

[0082] When the torque transmission between the input flange 5 and the output flange 2 is restored, the air chamber is depressurized, the sliding sleeve 38 abuts against the positioning shoulder under the elastic force of the compression spring 33, and the compressed air is discharged from the air chamber.

[0083] The present invention has been disclosed as above in the form of a preferred embodiment, but it is not intended to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A reset mechanism for a torque overload protection device, comprising an output flange (2) and an input flange (5), wherein a plurality of ejector-type torque overload couplings (4) are mounted on the end surface of the output flange (2) in a circular array; The thimble-type torque overload coupling (4) comprises a ball-end thrust rod (410), a disc spring (420), a conical ring (440), a sleeve (450), an end cover (460) and a plurality of wedge-shaped sliders (430); One end of the sleeve (450) is fixedly connected to the output flange (2), and the other end of the sleeve (450) is installed with an end cover (460); The ball-end thrust rod (410), the disc spring (420), the wedge-shaped slider (430) and the conical ring (440) are all arranged in the sleeve (450), and the displacement of the ball-end thrust rod (410) in the sleeve (450) is L1; The ball end of the ball thrust rod (410) abuts against the positioning groove on the input flange (5); the disc spring (420) and the conical ring (440) are sequentially mounted on the ball thrust rod (410), and the two ends of the disc spring (420) abut against the conical ring (440) and the end cover (460) respectively; The bottom of the sleeve (450) is provided with a first annular conical surface, and both end surfaces of the wedge-shaped sliding block (430) are respectively against the first annular conical surface and the conical ring (440); It is characterized in that Also includes: A fixed flange (36), a sliding sleeve (38) and a reset flange (311) arranged coaxially; The sliding sleeve (38) and the reset flange (311) are both sleeved on the fixed flange (36), the reset flange (311) is fixedly connected to the ball head thrust rod (410), an air chamber exists between the sliding sleeve (38) and the fixed flange (36), and the maximum displacement of the sliding sleeve (38) on the fixed flange (36) is L1; The fixed flange (36) is fixedly connected to the base, and a plurality of guide mechanisms are installed on the end surface of the fixed flange (36) in a circular array; The guide mechanism comprises a guide screw (31), a compression spring (33) and a guide sleeve (34); The guide sleeve (34) is fixedly connected to the fixed flange (36), the compression spring (33) is sleeved on the guide screw (31), and the guide screw (31) passes through the guide sleeve (34) and is connected to the sliding sleeve (38).

2. A reset mechanism for a torque overload protection device according to claim 1, characterized in that: The fixing flange (36) is integrally provided with a positioning shoulder, and the positioning shoulder is arranged in the air chamber, and the axial length of the positioning shoulder is L2.

3. A reset mechanism for a torque overload protection device according to claim 2, characterized in that: The sliding sleeve (38) is provided with a vent threaded hole, the vent threaded hole is communicated with the air chamber, and a pneumatic joint (310) is installed on the vent threaded hole.

4. A reset mechanism for a torque overload protection device according to claim 1, characterized in that: The guide mechanism also includes a washer (32) which is mounted on the guide screw (31). The two ends of the compression spring (33) respectively abut against the washer (32) and the bottom of the guide sleeve (34).

5. The reset mechanism for a torque overload protection device according to claim 3, characterized in that: A first sealing ring (37) is installed on the outer circumferential surface of the fixed flange (36); A third sealing ring (315) is installed on the inner circumferential surface of the sliding sleeve (38); A second sealing ring (313) is installed on the inner circumference of the bottom of the guide sleeve (34).

6. A method for resetting a torque overload protection device using the resetting mechanism according to any one of claims 1 to 5, characterized in that: The method is specifically carried out in the following steps: Step 1: First, ensure that there is no air pressure in the air chamber so that the sliding sleeve (38) abuts against the positioning shaft shoulder; Step 2: fix the fixing flange (36) to the base, and ensure that the distance between the sliding sleeve (38) and the reset flange (311) is maintained at L1; Step 3: First, when the torque input by the input flange (5) exceeds the rated torque of the pin-type torque overload coupling (4), the ball head thrust rod (410) and the reset flange (311) move along the axis of the sleeve (450) by a displacement of L1, and the ball head end no longer abuts against the positioning groove on the input flange (5), so as to cut off the torque transmission between the input flange (5) and the output flange (2). After the torque transmission is cut off, the power system of the shaft system is shut down, and the shaft system stops running; Then, the turning machine on the shaft system turns the input flange (5). At the same time, compressed air is introduced into the air chamber to make the sliding sleeve (38) push the reset flange (311) and the ball head thrust rod (410) to achieve the ball head end and the positioning groove to abut against each other again. When the input flange (5) drives the output flange (2) to rotate, the turning machine stops turning. Finally, the control system of the shaft system adjusts the torque input by the power system so that the input torque is less than the rated torque of the pin-type torque overload coupling (4); Step 4: The air chamber is depressurized. The sliding sleeve (38) is pressed against the positioning shaft shoulder under the elastic force of the compression spring (33). The compressed air is discharged from the air chamber, and the power system of the shaft system is started, so that the shaft system resumes operation.

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