A valve self-centering fixture and operation method

Abstract

The present invention discloses a valve self-centering fixture and operation method. The valve has a through hole. The fixture includes a mounting seat, at least one self-centering mechanism, a first driving mechanism and a second driving mechanism. The mounting seat includes a main body and a driving mechanism with a transmission shaft. The self-centering mechanism is connected to the transmission shaft. The self-centering mechanism includes two torque limiters, two end face threaded disks and multiple tightening mechanisms. Under the drive of the first driving mechanism, the mounting seat enters the through hole of the valve to be processed and moves linearly until it reaches a preset position. Under the drive of the second driving mechanism, the transmission shaft rotates to drive the torque limiter to rotate. The rotation of the torque limiter drives the two end face threaded disks to rotate in the same direction, thereby driving the multiple tightening mechanisms to move toward the inner wall of the valve through hole until they touch the inner wall, and the axis of the transmission shaft coincides with the valve through hole datum. The valve self-centering fixture provided by the present invention realizes a large clamping stroke, reliable clamping torque and self-locking ability.

Description

Technical Field

[0001] The invention relates to the field of mechanical manufacturing, and in particular to a valve self-centering fixture and an operating method. Background Art

[0002] At present, when processing symmetrical parts of castings and forgings, the production and processing is basically carried out by manual dialing, correction and clamping. Generally, parts like this are mostly small quantity and multiple batches, or large quantity and multiple batches of parts. Therefore, the ability to clamp such parts quickly and efficiently is of great significance for improving production quality, improving production efficiency, reducing production costs, and reducing the labor intensity of workers.

[0003] At present, single-action adjustable four-jaw chuck is often used to clamp and correct symmetrical blank parts, because this chuck has a large degree of adjustment freedom and a simple and reliable structure; but the correction is troublesome; and the four jaws are single-action, and each jaw has a screw rod. When one screw rod is turned, only one jaw can move, and it cannot be self-centering. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides a valve self-centering fixture and an operating method, and the technical solution is as follows:

[0005] On the one hand, the present invention provides a valve self-centering fixture, the valve has a through hole, the fixture is used to locate the valve through hole reference, the fixture includes a mounting seat, at least one self-centering mechanism, a first drive mechanism and a second drive mechanism, the mounting seat includes a main body and a transmission mechanism arranged in the main body, the transmission mechanism includes a transmission shaft, and the self-centering mechanism is connected to the transmission shaft;

[0006] Each self-centering mechanism includes two torque limiters sleeved outside the transmission shaft, two end surface threaded disks arranged opposite to each other between the two torque limiters, and a plurality of tightening mechanisms arranged between the two end surface threaded disks, each tightening mechanism moves relative to the center of the end surface threaded disk, the end surface threaded disks correspond to the torque limiters one by one and are fixedly connected, and the transmission shaft, the torque limiter and the end surface threaded disks are coaxially arranged;

[0007] The mounting seat has an opening at a side wall corresponding to each of the tightening mechanisms, and the outer end of the tightening mechanism always protrudes out of the opening;

[0008] Under the drive of the first driving mechanism, the mounting seat enters the through hole of the valve to be processed and moves linearly until it reaches a preset position;

[0009] Driven by the second driving mechanism, the transmission shaft of the mounting seat located at the preset position rotates to drive the torque limiter to rotate. The rotation of the torque limiter drives the two end threaded disks to rotate in the same direction, thereby driving the multiple tightening mechanisms to move toward the inner wall of the valve through hole until they all touch the inner wall, and make the axis center line of the transmission shaft coincide with the valve through hole reference.

[0010] Furthermore, the tightening mechanism includes a top claw threadedly connected to the end surface threaded disk.

[0011] Furthermore, the tightening mechanism further comprises a top head threadedly connected to the top claw, and the top head is used to abut against the inner wall of the valve through hole.

[0012] Furthermore, an end face thread is formed on the end face threaded disk, and screw teeth matching the end face thread are arranged outside the top claw, and the end face threaded disk is threadedly connected to the top claw.

[0013] Furthermore, the number of the pressing mechanisms is four, the axis centers of two pressing mechanisms arranged opposite to each other coincide, and the axis centers of another two pressing mechanisms arranged opposite to each other coincide, and when the transmission shaft rotates, the two pressing mechanisms arranged opposite to each other move in opposite directions.

[0014] Furthermore, the outer circumferential wall at one end of the plug has an external thread matching the internal thread of the top claw, and the other end is a cylindrical structure.

[0015] Furthermore, the top claw is a cubic structure.

[0016] Furthermore, the clamping mechanism is detachably arranged between the two end surface threaded disks.

[0017] On the other hand, the present invention also provides a method for positioning a valve through hole reference using the valve self-centering fixture, which comprises the following steps:

[0018] S1, using the first driving mechanism to drive the mounting seat into the through hole of the valve to be processed to make a linear motion until it reaches a preset position;

[0019] S2, using the second driving mechanism to drive the transmission shaft of the mounting seat located at the preset position to rotate, so as to drive the two torque limiters to rotate, and the rotation of the torque limiters drives the two end surface threaded disks to rotate in the same direction, thereby driving the multiple tightening mechanisms to move toward the inner wall of the valve through hole until they all touch the inner wall, and make the axis of the transmission shaft coincide with the valve through hole reference;

[0020] S3. After the processing is completed, the second driving mechanism is first used to drive the transmission shaft to rotate so that the tightening mechanism returns to its position, and then a backward driving force is provided to move the mounting seat backward as a whole until it withdraws from the through hole of the valve, wherein the rotation direction of the transmission shaft in step S3 is opposite to the rotation direction of the transmission shaft in step S2.

[0021] Furthermore, in step S2, when the two relatively arranged pressing mechanisms both contact the inner wall corresponding to the valve through hole, the torque on the torque limiter corresponding to the two pressing mechanisms continues to increase until it is greater than its torque limit value, and then the torque limiter is actuated to protect the separation.

[0022] The beneficial effects brought by the technical solution provided by the present invention are as follows:

[0023] a. The present invention provides a self-centering fixture for valves, which can be self-centering, achieve a large clamping stroke, reliable clamping torque and self-locking capability;

[0024] b. The valve self-centering fixture provided by the present invention can be used in a single group or in two or more groups at the same time (it can be adjusted and manufactured according to the product); the workpiece is easy to clamp and the action is reliable; the production cost is low and it is easy to produce;

[0025] c. The valve self-centering fixture provided by the present invention can self-position valves with different inner diameters and has universality;

[0026] d. The operating method of the valve self-centering fixture provided by the present invention is simple to operate, requires short processing time and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a cutaway stereoscopic view of a valve self-centering fixture provided by an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 A magnified image of

[0030] Figure 3 is a cross-sectional view of a valve self-centering fixture provided by an embodiment of the present invention;

[0031] Figure 4 It is a three-dimensional diagram of an end face threaded disk of a valve self-centering fixture provided by an embodiment of the present invention;

[0032] Figure 5 is a three-dimensional diagram of a top jaw of a valve self-centering fixture provided by an embodiment of the present invention;

[0033] Figure 6 is a three-dimensional diagram of a top of a valve self-centering fixture provided by an embodiment of the present invention;

[0034] Figure 7 is a three-dimensional diagram of a valve provided by an embodiment of the present invention;

[0035] Figure 8 is a cross-sectional view of a through hole reference line of a valve provided by an embodiment of the present invention;

[0036] Fig. 9 is a cross-sectional view of the B reference plane and the C reference plane of the valve provided by the embodiment of the present invention;

[0037] Fig.10 This is the first route map for positioning a valve by a valve self-centering fixture provided by an embodiment of the present invention;

[0038] Fig.11 This is the second route map for positioning a valve by the valve self-centering fixture provided in the embodiment of the present invention.

[0039] Among them, the figure marks include: 1-valve, 11-through hole reference line, 12-B reference plane, 13-C reference plane, 14-flange, 15-end, 2-main body, 3-transmission shaft, 4-torque limiter, 5-end face threaded disk, 6-top claw, 7-top head, 8-fixed flange. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0042] The processing object of the valve self-centering fixture provided by the present invention is an irregular symmetrical part, specifically a valve with a through hole, see Figure 7 , Figure 8 and Fig. 9 The valve has two connected flanges 14 and an end 15. The two flanges 14 have through holes, and the end has an opening. The vertical cross-section of the opening is elliptical. The valve through hole is deformed after casting. After deformation, it is not a regular circular hole, but an ellipse. Because the through hole is cast, its true roundness and surface cannot be directly defined by the A reference; the positioning efficiency cannot be improved by the traditional method.

[0043] In one embodiment of the present invention, a valve self-centering fixture is provided. Figures 1 to 3 As shown, the fixture is used to locate the valve through hole reference 11, referred to as A reference. After determining the A reference, the B reference surface 12 and the C reference surface 13 are calibrated, or the rough and fine machining of the two flanges are used as auxiliary fine references.

[0044] The specific structure of the tooling fixture is as follows: it includes a mounting seat, at least one self-centering mechanism, a first driving mechanism and a second driving mechanism. The mounting seat includes a main body 2 and a transmission mechanism arranged in the main body 2. The transmission mechanism includes a transmission shaft 3. The self-centering mechanism is connected to the transmission shaft 3. The transmission shaft 3 is placed at the center of the mounting seat and can rotate freely. The main body 2 is an outer shell seat.

[0045] The specific structure of each self-centering mechanism is as follows: it includes two torque limiters 4 sleeved on the outside of the transmission shaft 3, two end face threaded disks 5 arranged between the two torque limiters 4, and multiple tightening mechanisms arranged between the two end face threaded disks 5. The two torque limiters 4 are arranged at intervals, and the end face threaded disks 5 correspond to the torque limiters 4 one by one and are fixedly connected, that is, the end face threaded disks 5 are fixedly connected to the adjacent torque limiters 4.

[0046] Each tightening mechanism moves relative to the center of the end face threaded disk 5, and the tightening mechanism is slidably connected to the end face threaded disk 5. Multiple tightening mechanisms are preferably evenly distributed around the circumference of the end face threaded disk 5. The tightening mechanism is preferably set to four, and the axis lines of the two tightening mechanisms arranged opposite to each other coincide, and the axis lines of the other two tightening mechanisms arranged opposite to each other coincide, that is, the axis lines of each adjacent two tightening mechanisms are arranged vertically. When the transmission shaft rotates, the two tightening mechanisms arranged opposite to each other move in opposite directions (these two tightening mechanisms move simultaneously). The transmission shaft 3, the torque limiter 4 and the end face threaded disk 5 are arranged coaxially.

[0047] The mounting seat has an opening at a side wall corresponding to the pressing mechanism, and the outer end of the pressing mechanism always protrudes out of the opening.

[0048] Driven by the first driving mechanism, the mounting seat enters the through hole of the valve 1 to be processed and moves linearly until it reaches the preset position; driven by the second driving mechanism, the transmission shaft 3 of the mounting seat located at the preset position rotates to drive the torque limiter 4 to rotate, and the rotation of the torque limiter 4 drives the two end face threaded disks 5 to rotate in the same direction, thereby driving the multiple clamping mechanisms to move toward the inner wall of the through hole of the valve 1 (i.e., move away from the center of the end face threaded disk) until the multiple clamping mechanisms all hit the inner wall, and make the axial center line of the transmission shaft 3 coincide with the valve through hole reference 11, that is, define the through hole reference while clamping the valve.

[0049] The specific structure of the tightening mechanism is as follows: it includes a top claw 6 threadedly connected to the end surface threaded disk 5 and a top head 7 threadedly connected to the top claw 6, and the top head 7 is used to abut against the inner wall of the through hole of the valve 1. When the inner diameter of the valve through hole is large, it is only necessary to replace the top head 7 with a longer length without replacing the entire self-centering mechanism.

[0050] The end face threaded disk 5 has an end face thread (see Figure 4 ), an outer side wall of the top claw 6 is provided with a screw tooth matching the end face thread, the end face thread disk 5 is threadedly connected with the top claw 6, and the end face thread disk 5 and the top claw 6 cooperate with each other to form a spiral transmission.

[0051] The specific structure of the top claw 6 is as follows: Figure 5 It is preferably a cubic structure with an opening with an internal thread in the center, and an outer side wall of the top claw 6 is provided with screw teeth.

[0052] The outer circumferential wall at one end of the plug 7 has an external thread that matches the internal thread of the top claw 6, and the other end is a cylindrical structure. The plug 7 is threadedly connected to the top claw 6. The top claw 6 and the mounting seat are clearance-matched, see Figure 6 .

[0053] Preferably, the tightening mechanism is detachably arranged between the two end surface threaded disks 5 to facilitate disassembly and replacement.

[0054] The working principle of the valve self-centering fixture provided by the present invention is as follows: a directional power is given to the transmission shaft to make the transmission shaft rotate, and the rotation of the transmission shaft drives the torque limiter connected thereto and the end face threaded disk mounted on the torque limiter to rotate, and the top claw matched with the end face threaded disk converts the rotational force into the linear motion of the top claw. Specifically, the end face thread on the end face threaded disk is a single-line equal pitch thread, and the top claw has a corresponding thread line. When the end face threaded disk rotates, it drives the top claw matched with it to change its displacement (making the top claw matched with the end face threaded disk perform a certain displacement of centripetal or centrifugal motion). Because of the relative matching constraint of the mounting seat, the top claw can only change the spiral rotation into linear motion. See Figure 1 When the transmission shaft rotates, two top claws arranged oppositely move in opposite directions (one top claw moves upward (forward), and the other top claw moves downward (backward)). These two top claws can move equidistantly relative to the center of the end face threaded disk, that is, the strokes of these two top claws are the same. Similarly, the other two top claws arranged oppositely move equidistantly relative to the center of the end face threaded disk, and the strokes of these two top claws are the same. Because the valve through hole is elliptical, four points need to be located in order to locate the A reference, so the said tightening mechanism is preferably set to four.

[0055] In the existing self-centering chucks, each chuck requires an independent power structure, and it is impossible to realize that one power structure drives multiple chucks to move simultaneously. The valve self-centering fixture provided by the present invention can be provided with multiple self-centering mechanisms, and multiple self-centering mechanisms are connected to a transmission mechanism, and the transmission mechanism can drive multiple self-centering mechanisms to move, which greatly saves energy and reduces the overall structure volume.

[0056] The length of the thread teeth on the top jaw and the thread on the end face threaded disk determines the stroke of the top jaw. The existing self-centering four-jaw chuck has no self-locking function, and the structure of the connection between the top jaw and the piston of the oil cylinder can only be a conical surface (inclined surface). The length and inclination angle of the inclined surface determine the stroke size. The designed stroke is small. Under the same size of the chuck and the end face threaded disk, the stroke of the top jaw of the valve self-centering fixture provided by the present invention is much larger than the stroke of the top jaw of the existing self-centering four-jaw chuck. For example, the existing self-centering four-jaw chuck has a maximum outer diameter of 200mm and a top jaw stroke of 3.7mm. The end face threaded disk of the valve self-centering fixture provided by the present invention has a maximum outer diameter of 200mm and a top jaw stroke of 22mm.

[0057] The valve self-centering fixture provided by the present invention is provided with a torque limiter to reduce torque, and the tightening mechanism will not over-tighten the inner wall of the valve through hole, thereby providing a reliable clamping torque.

[0058] The existing self-centering four-jaw chuck has no self-locking function. If force is applied to the top jaw, the top jaw will be displaced. The valve self-centering fixture provided by the present invention has a tightening mechanism and an end face threaded disk that cooperate. When the transmission shaft stops rotating, if force is applied to the tightening mechanism, the tightening mechanism will not move, and the self-locking function can be achieved. The tightening mechanism will only be displaced when the end face threaded disk rotates.

[0059] The valve self-centering fixture also includes a fixing flange 8 fixedly connected to the mounting seat, the fixing flange 8 is used to connect to a machine tool, and the mounting seat and the fixing flange are precisely matched and fixedly connected.

[0060] The first driving mechanism and the second driving mechanism can be driven by hydraulic pressure, pneumatic pressure or electric pressure.

[0061] The present invention also provides a method for positioning a valve through hole reference by using the valve self-centering fixture, which comprises the following steps:

[0062] S1, using the first driving mechanism to drive the mounting seat into the through hole of the valve to be processed to make a linear motion until it reaches a preset position, at which position all the tightening mechanisms are in the through hole;

[0063] S2. Use the second driving mechanism to drive the transmission shaft 3 of the mounting seat located at the preset position to rotate, so as to drive the two torque limiters 4 to rotate in the same direction. The rotation of the torque limiters 4 drives the two end surface threaded disks 5 to rotate in the same direction, thereby driving the multiple tightening mechanisms to move toward the inner wall of the valve through hole until they all touch the inner wall, and make the axis of the transmission shaft 3 coincide with the valve through hole reference 11;

[0064] S3. After the processing is completed, the second driving mechanism is first used to drive the transmission shaft 3 to rotate so that the tightening mechanism returns to its position, and then a backward driving force is provided to move the mounting seat backward as a whole until it withdraws from the through hole of the valve, wherein the rotation direction of the transmission shaft 3 in step S3 is opposite to the rotation direction of the transmission shaft 3 in step S2.

[0065] In step S2, after the two relatively arranged tightening mechanisms first contact the inner wall corresponding to the valve through hole, the torque on the torque limiter 4 corresponding to the two tightening mechanisms continues to increase until it is greater than its torque limit value, and then the torque limiter 4 is actuated to protect the separation without affecting the continued action of other tightening mechanisms.

[0066] Since the valve through hole is not a regular circle, the movement stroke of each top claw is different. When some top claws first hit the inner wall of the through hole, because the transmission shaft is still outputting power, the torque on the torque limiter on the side of the top claw that hits first will continue to increase until it exceeds its torque limit value. At this time, the torque limiter will act to protect the separation (that is, when the transmitted torque exceeds the torque limiter setting value, the torque limiter will automatically disengage), without affecting the continued movement of other top claws.

[0067] In step S3, when all torque limiters (one set of self-centering mechanisms includes two torque limiters, and if there are multiple sets of self-centering mechanisms, there are multiple torque limiters) are separated from each other for protection, the transmission shaft stops moving, the positioning and clamping of the valve is completed, and the A reference line of the valve automatically coincides with the center axis of the transmission shaft (see Fig.10 and Fig.11 The two route diagrams are shown in Figure 1, where A is the A datum line. This means that the machining is complete. At this point, the workpiece can be subjected to the next step (calibration of the B datum plane and the C datum plane) or rough and fine machining of the two flanges can be used as an auxiliary fine datum.

[0068] The present invention provides a valve self-centering fixture, which can be self-centering, realize a large clamping stroke, reliable clamping torque and self-locking ability; the valve self-centering fixture provided by the present invention can be used in a single group or in two or more groups at the same time (can be adjusted and manufactured according to the product); the workpiece is easy to clamp and the action is reliable; the production cost is low and the production is easy; the valve self-centering fixture provided by the present invention can self-position valves with different inner diameters and has universality; the operation method of the valve self-centering fixture provided by the present invention is simple to operate, the processing time is short, and the production efficiency is high.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve self-centering fixture, the valve (1) having a through hole, the fixture being used to locate the valve through hole reference (11), characterized in that: The fixture comprises a mounting seat, at least one self-centering mechanism, a first driving mechanism and a second driving mechanism; the mounting seat comprises a main body (2) and a transmission mechanism arranged in the main body (2); the transmission mechanism comprises a transmission shaft (3); and the self-centering mechanism is connected to the transmission shaft (3); Each self-centering mechanism comprises two torque limiters (4) sleeved outside the transmission shaft (3), two end surface threaded disks (5) arranged opposite to each other and arranged between the two torque limiters (4), and a plurality of tightening mechanisms arranged between the two end surface threaded disks (5), each tightening mechanism moves relative to the center of the end surface threaded disk (5), the end surface threaded disks (5) correspond to the torque limiters (4) one by one and are fixedly connected, and the transmission shaft (3), the torque limiter (4) and the end surface threaded disk (5) are coaxially arranged; The mounting seat has an opening at a side wall corresponding to each of the tightening mechanisms, and the outer end of the tightening mechanism always protrudes out of the opening; Under the drive of the first driving mechanism, the mounting seat enters the through hole of the valve (1) to be processed and moves linearly until it reaches a preset position; Under the drive of the second driving mechanism, the transmission shaft (3) of the mounting seat located at the preset position rotates to drive the torque limiter (4) to rotate, and the rotation of the torque limiter (4) drives the two end surface threaded disks (5) to rotate in the same direction, thereby driving the plurality of tightening mechanisms to move toward the inner wall of the through hole of the valve (1) until they all contact the inner wall, and the axis of the transmission shaft (3) coincides with the valve through hole reference (11); The tightening mechanism comprises a top claw (6) threadedly connected to the end surface threaded disk (5); The plurality of clamping mechanisms are four, the axis centers of two clamping mechanisms arranged opposite to each other coincide with each other, and the axis centers of the other two clamping mechanisms arranged opposite to each other coincide with each other. When the transmission shaft rotates, the two clamping mechanisms arranged opposite to each other move in opposite directions.

2. The valve self-centering fixture according to claim 1, characterized in that: The tightening mechanism further comprises a top head (7) threadedly connected to the top claw (6), and the top head (7) is used to abut against the inner wall of the through hole of the valve (1).

3. The valve self-centering fixture according to claim 2, characterized in that: The end face threaded disc (5) is formed with an end face thread, the top claw (6) is provided with screw teeth matching the end face thread, and the end face threaded disc (5) is threadedly connected to the top claw (6).

4. The valve self-centering fixture according to claim 2, characterized in that: The outer circumferential wall at one end of the top head (7) has an external thread that matches the internal thread of the top claw (6), and the other end is a cylindrical structure.

5. The valve self-centering fixture according to claim 1, characterized in that: The top claw (6) is a cubic structure.

6. The valve self-centering fixture according to claim 1, characterized in that: The pressing mechanism is detachably arranged between two end surface threaded disks (5).

7. A method for positioning a valve through hole reference using the valve self-centering fixture according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, using the first driving mechanism to drive the mounting seat into the through hole of the valve to be processed to make a linear motion until it reaches a preset position; S2, using the second driving mechanism to drive the transmission shaft of the mounting seat located at the preset position to rotate, so as to drive the two torque limiters to rotate, and the rotation of the torque limiters drives the two end surface threaded disks to rotate in the same direction, thereby driving the multiple tightening mechanisms to move toward the inner wall of the valve through hole until they all touch the inner wall, and make the axis of the transmission shaft coincide with the valve through hole reference; S3. After the processing is completed, the second driving mechanism is first used to drive the transmission shaft to rotate so that the tightening mechanism returns to its position, and then a backward driving force is provided to move the mounting seat backward as a whole until it withdraws from the through hole of the valve, wherein the rotation direction of the transmission shaft in step S3 is opposite to the rotation direction of the transmission shaft in step S2.

8. The method for positioning the valve through hole reference by the valve self-centering fixture according to claim 7, characterized in that: In step S2, when the two relatively arranged pressing mechanisms both contact the inner wall corresponding to the valve through hole, the torque on the torque limiter corresponding to the two pressing mechanisms continues to increase until it is greater than the torque limit value, and the torque limiter is actuated to protect the separation.

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