Reset mechanism and reset method for a torque overload protection device

Abstract

The application relates to a reset mechanism and a reset method for a torque overload protection device. In order to solve the problems that the safety of an operator and the timeliness of reset are at risk when the torque overload protection device is reset in the prior art, the application comprises a fixed flange, a sliding sleeve and a reset flange which are coaxially arranged. The sliding sleeve and the reset flange are sleeved on the fixed flange, the reset flange is fixedly connected with a ball head thrust rod, and a gas chamber exists between the sliding sleeve and the fixed flange. The fixed flange is fixedly connected with a base, and a plurality of sets of guide mechanisms are installed on the end face of the fixed flange. The application has the advantages of simple structure, simple operation, no need of personnel to operate on the equipment site, reduced safety risk of the operator, improved timeliness of restoring power of a mechanical transmission system, saved time for restoring power transmission of a transmission shaft system in industrial production and various special industries, and belongs to the technical field of overload protection couplings.

Description

TECHNICAL FIELD

[0001] The present application 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, and belongs to the technical field of overload protection couplings. BACKGROUND

[0002] Couplings play an indispensable role in industrial development, not only connecting and transmitting power, but also compensating and damping the transmission shaft system, thereby improving the reliability and service life of the power system equipment. With the rapid development of modern industrial development, the use frequency of electric motors is greatly increased, but faults inevitably occur during operation, causing a sharp increase in instantaneous torque, which far exceeds the designed limit torque, causing serious harm to the transmission system.

[0003] Therefore, the common solution is to design an overload protection device, such as the patents with publication numbers CN117722448A and WO2016000272A1, which both propose a shear pin structure that automatically shears when the transmission system transmits torque exceeding the designed torque of the shear pin to interrupt power transmission. However, the two schemes have the disadvantages of low overload protection torque accuracy and long reset time for replacing the shear pin. For example, the patent with publication number CN109595268A discloses a large-torque multi-friction over-torque protection structure, which transmits torque by utilizing the mutual friction between multiple layers of friction plates. When over-torque occurs, the friction plates slip to achieve power interruption between the driving end and the driven end. The advantage is that the reset after over-torque does not require additional operation and can continue to work, but the disadvantage is that the friction plate slipping causes wear and heating.

[0004] To solve the above problems, the patent with publication number CN203627578U discloses a thimble type torque overload protection device. The technical scheme of this patent utilizes the cooperation between the spherical surface and the inner conical surface to transmit torque, and achieves torque transmission and disengagement by balancing the axial force of the compressed butterfly spring and the axial component force of the conical surface of the conical hole block. The advantage of this thimble type structure is 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 is required to push the spherical surface to the position where it cooperates with the inner conical surface during reset. However, for manual reset methods, there are certain risks to the safety and timeliness of the operation in complex environments such as small operation space, equipment operation cannot be stopped, and oil and water leakage.

[0005] In summary, how to solve the above technical problems by proposing a reset mechanism and a reset method has become a problem that needs to be solved by technical personnel in the field. SUMMARY

[0006] The present application aims at the deficiencies of the prior art, and provides a reset mechanism for a torque overload protection device.

[0007] The technical scheme of the present application is: a reset mechanism for a torque overload protection device, comprising an output flange and an input flange, and a plurality of top pin type torque overload shaft couplings are installed on the end face of the output flange in an annular array.

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

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

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

[0011] The ball head end of the ball head thrust rod abuts against the positioning groove on the input flange; the disc spring and the conical ring are sequentially sleeved on the ball head 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 taper surface, and the two end faces of the wedge-shaped sliding block abut against the first annular taper surface and the conical ring respectively.

[0013] Further, it further comprises: 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, there is an air chamber 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 groups of guide mechanisms are installed on the end face of the fixed flange in an annular array.

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

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

[0018] The present application also provides a reset method for a torque overload protection device, which is specifically performed according to the following steps:

[0019] Step one, first, ensure that there is no air pressure in the air chamber, so that the sliding sleeve abuts against the positioning shaft shoulder;

[0020] Step two, the fixed flange is fixed on the base, and the distance between the sliding sleeve and the reset flange is kept as L1;

[0021] Step three, first, when the torque input by the input flange exceeds the rated torque of the thimble type torque overload coupling, the ball head thrust rod and the reset flange move along the axis of the sleeve by a displacement amount of L1, the ball head end is no longer in abutment with the positioning groove on the input flange, so as to achieve the cut-off of the torque transmission between the input flange and the output flange, after the cut-off of the torque transmission, the power system of the shafting is shut down, and the shafting stops running;

[0022] Then, the shafting is turned by the shafting machine, and at the same time, compressed air is introduced into the air chamber, so that the sliding sleeve pushes the reset flange and the ball head thrust rod, so as to realize the abutment of the ball head end with the positioning groove again, when the input flange drives the output flange to rotate, the shafting machine stops turning;

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

[0024] Step four, the air chamber is depressurized, the sliding sleeve is in abutment with the positioning shaft shoulder under the elastic force of the compression spring, the compressed air is discharged from the air chamber, the power system of the shafting is started, and the shafting resumes running.

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

[0026] 1. The present application has simple structure and simple operation, the whole reset process is fully automatic, personnel do not need to operate on site, so as to reduce the safety risk of operators, improve the time efficiency of restoring power of the mechanical transmission system, and save time for restoring power transmission of the transmission shafting in industrial production and various special industries. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of the present application;

[0028] Figure 2 is a schematic diagram of the thimble type torque overload coupling 4 in the present application at the transmission torque and the cut-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 application;

[0030] Figure 4 is a sectional view of the present application;

[0031] Figure 5 is Figure 4 is a local enlarged view of I in

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

[0033] In the figure: 2, output flange; 4, thimble torque overload coupling; 410, ball head thrust rod; 420, disc spring; 430, wedge-shaped slider; 440, conical 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 application purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[0035] Specific embodiment one: in combination with Figures 1 to 6 In this embodiment, a reset mechanism for a torque overload protection device includes an output flange 2 and an input flange 5. A plurality of thimble torque overload couplings 4 are installed on the end face of the output flange 2 in an annular array.

[0036] The thimble torque overload coupling 4 includes a ball head 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 provided with the end cover 460.

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

[0039] A second annular taper for guiding the wedge-shaped slider 430 is arranged on the outer circumferential surface of the ball head thrust rod 410. The ball head thrust rod 410 penetrates the sleeve 450, and the ball head end of the ball head thrust rod 410 abuts against a positioning groove on the input flange 5. The disc spring 420 and the conical ring 440 are sequentially sleeved 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] A first annular taper is arranged on the bottom of the sleeve 450, and the two end faces of the wedge-shaped slider 430 abut against the first annular taper and the conical ring 440, respectively. The wedge-shaped sliders 430 are arranged around the ball head thrust rod 410 in a circumferential array, and the wedge-shaped sliders 430 can approach or move away from the axis of the ball head thrust rod 410.

[0041] Further comprising: a coaxial arrangement of a fixed 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 with 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 amount of the sliding sleeve 38 on the fixed flange 36 is L1.

[0043] The fixed flange 36 is fixedly connected to the base through a plurality of bolts, the angle θ between each bolt is 360° / N, where N is the number of bolts; a plurality of sets of guide mechanisms are installed on the end face of the fixed flange 36 in an annular array manner.

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

[0045] The guide sleeve 34 is fixedly connected with the fixed flange 36, and the contact surface between the guide sleeve 34 and the fixed flange 36 is coated with sealing glue; 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 is connected with the sliding sleeve 38 after penetrating through the guide sleeve 34, the remaining thread length in the threaded hole on the sliding sleeve 38 after the guide screw 31 is installed is L4, and L4>L0, so that the pre-compression amount can be realized by the length of the guide screw 31, and the pre-compression amount can be adjusted when the pre-compression amount changes.

[0046] The top pin type torque overload coupling 4 in the embodiment is a prior art, specifically a top pin type torque overload protection device disclosed in public number CN203627578U.

[0047] Further, 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, so that the first sealing ring 37 is prevented from being exposed to air to cause air leakage of the air chamber, and reset failure of the sliding sleeve 38 is avoided.

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

[0049] Further, a second sealing ring 313 is installed on the inner circumferential surface of the bottom of the guide sleeve 34, so that the gas in the air chamber is prevented from leaking.

[0050] Furthermore, a positioning shoulder is integrally provided on the fixed flange 36, and the positioning shoulder is located in the air chamber. The axial length of the positioning shoulder is L2. With this arrangement, when there is no air pressure in the air chamber, the sliding sleeve 38 abuts 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 2-3mm. The pre-compression amount L0 is set to ensure that the sliding sleeve 38 reliably abuts against the positioning shoulder, and also to facilitate the filling of the air chamber with gas.

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

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

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

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

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

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

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

[0058] n: safety factor, which is 2 to 3.

[0059] Furthermore, the maximum spring force provided by the compression spring 33 when it is 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 compression spring 33;

[0062] L1: The 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 It can push the sliding sleeve 38, which in turn pushes the reset flange 311 and the ball head thrust rod 410 to make the ball head end abut against the positioning groove again, where:

[0064] P: Pressure of compressed air;

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

[0066] r: the diameter of the air chamber.

[0067] Specific implementation two: combined Figure 4 This embodiment is described, the air thread hole is opened on the slip sleeve 38, the air thread hole is communicated with the air chamber, and the pneumatic connector 310 is installed on the air thread hole. Other components and connection relationships are the same as those in specific implementation one.

[0068] Specific implementation three: combined Figure 4 And Figure 5 This embodiment is described, the guide mechanism further includes a washer 32, the washer 32 is installed on the guide screw 31, and the two ends of the compression spring 33 are respectively abutted with the washer 32 and the bottom of the guide sleeve 34. Other components and connection relationships are the same as those in specific implementation one or two.

[0069] Specific implementation four: combined Figures 1 to 6 This embodiment is described, a reset method for the torque overload protection device, and the specific steps are as follows:

[0070] Step one, first, ensure that there is no air pressure in the air chamber, so that the slip sleeve 38 abuts against the positioning shaft shoulder;

[0071] Step two, the fixed flange 36 is fixedly connected to the base, and the distance between the slip sleeve 38 and the reset flange 311 is kept as L1;

[0072] Step three, first, when the torque input by the input flange 5 exceeds the rated torque of the thimble 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 L1, 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 cutting off the torque transmission, the power system of the shaft train stops, and the shaft train stops running;

[0073] Then, the shaft train is turned by the shaft turning machine, and at the same time, the compressed air is introduced into the air chamber, so that the slip sleeve 38 pushes the reset flange 311 and the ball head thrust rod 410, so as to realize that the ball head end abuts against the positioning groove again, when the input flange 5 drives the output flange 2 to rotate, the shaft turning machine stops turning;

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

[0075] Step four, the air chamber is depressurized, the slip sleeve 38 abuts against the positioning shaft shoulder under the elastic force of the compression spring 33, the compressed air is discharged from the air chamber, the power system of the shaft train is started, and the shaft train resumes running.

[0076] Working principle

[0077] Combination Figures 1 to 6 The working principle of the present application is explained as follows:

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

[0079] When the torque inputted by the input flange 5 exceeds the rated torque of the top pin type torque overload coupling 4,

[0080] The ball head thrust rod 410 has a tendency to move towards the sliding sleeve 38, and under the guidance of the second annular taper surface, the wedge-shaped sliding block 430 moves away from the axis of the ball head thrust rod 410, finally making the ball head thrust rod 410 and the reset flange 311 move along the axis of the sleeve 450 by a displacement L1, and the ball head end is no longer in abutment with the positioning groove on the input flange 5, so as to achieve the cut-off of the torque transmission between the input flange 5 and the output flange 2, at this time, the external control system needs to adjust the torque inputted by the input flange 5, so that the input torque is less than the rated torque of the top pin type torque overload coupling 4.

[0081] Since the ball head thrust rod 410 is fixedly connected with the reset flange 311, and the sliding sleeve 38 and the reset flange 311 are both sleeved on the fixed flange 36, the 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, the sliding sleeve 38 pushes the reset flange 311 and the ball head thrust rod 410, so as to realize the abutment of the ball head end and the positioning groove again.

[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 is in abutment with the positioning shaft shoulder under the elastic force of the compression spring 33, and the compressed air is discharged from the air chamber.

[0083] The present application has been disclosed in the above-mentioned preferred embodiments, however, it is not intended to limit the present application, any person skilled in the art, without departing from the technical solutions of the present application, according to the technical essence of the present application, any simple modification, equivalent change and modification made on the above-mentioned embodiments, still belongs to the technical solution range of the present application.

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 pin-type torque overload couplings (4) are mounted on the end face of the output flange (2) in a ring array; The pin-type torque overload coupling (4) includes a ball-head thrust rod (410), a disc spring (420), a conical ring (440), a sleeve (450), an end cap (460), and several 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 fitted with an end cap (460); The ball-head thrust rod (410), disc spring (420), wedge slider (430) and conical ring (440) are all arranged inside the sleeve (450), and the displacement of the ball-head thrust rod (410) inside the sleeve (450) is L1; The ball 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 fitted onto the ball-head thrust rod (410), and the two ends of the disc spring (420) abut against the conical ring (440) and the end cap (460) respectively; The bottom of the sleeve (450) is provided with a first annular conical surface, and the two end faces of the wedge-shaped slider (430) abut against the first annular conical surface and the conical ring (440) respectively; Its features are, Also includes: The fixed flange (36), sliding sleeve (38), and reset flange (311) are 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). There is an air chamber between the sliding sleeve (38) and the fixed flange (36). The maximum displacement of the sliding sleeve (38) on the fixed flange (36) is L1. The fixed flange (36) is fixed to the base, and several sets of guide mechanisms are installed on the end face of the fixed flange (36) in a ring array. The guiding mechanism includes 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), and the compression spring (33) is sleeved on the guide screw (31). The guide screw (31) passes through the guide sleeve (34) and is connected to the sliding sleeve (38).

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

3. A reset mechanism for a torque overload protection device according to claim 2, characterized in that: The sliding sleeve (38) has a vent threaded hole that communicates with the air chamber, and a pneumatic connector (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 guiding mechanism also includes a washer (32), which is mounted on the guide screw (31). The two ends of the compression spring (33) abut against the bottom of the washer (32) and the guide sleeve (34), respectively.

5. A 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 reset method for a torque overload protection device using the reset mechanism according to any one of claims 1 to 5, characterized in that: This 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 shoulder; Step 2: Fix the fixed flange (36) to the base, and ensure that the distance between the sliding sleeve (38) and the reset flange (311) is 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 by a displacement of L1 along the axis of the sleeve (450), 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 cutting off the torque transmission, the power system of the shaft system stops and the shaft system stops running. Then, the turning machine on the shaft system turns the input flange (5) while compressed air is introduced into the air chamber, so that the sliding sleeve (38) pushes the reset flange (311) and the ball head thrust rod (410) to make the ball head end abut against the positioning groove again. When the input flange (5) drives the output flange (2) to rotate, the turning machine stops turning. Finally, the shaft system control system adjusts the torque input to the power system so that the input torque is less than the rated torque of the pin-type torque overload coupling (4). Step 4: Depressurize the air chamber. Under the elastic force of the compression spring (33), the sliding sleeve (38) abuts against the positioning shoulder, 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.

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