CN114654426A - A kind of automatic tightening device and tightening method of three-position cylinder piston assembly - Google Patents

Abstract

The invention discloses an automatic tightening device and a tightening method for a three-position ram piston assembly, and relates to the technical field of piston assembly, including a rotating mechanism, a positioning mechanism, a driving mechanism, a clamping assembly, an end ring piston and a tailstock piston. Both ends of the piston are provided with at least one clamping assembly, and the clamping assembly has an annular clamping end that restricts the radial displacement of the piston rod, the annular clamping end is rotatably connected with the piston rod, and the annular clamping end follows the piston rod as an axis In the present invention, the annular clamping end limits the radial displacement of the piston rod, and the positioning mechanism locates the non-tightening end of the tailstock piston, and also It plays the role of limiting the radial displacement of the piston rod, that is, the multiple points on the integral piston assembly simultaneously limit the radial displacement of the piston rod, which greatly improves the accuracy of assembly, and can ensure that the thread is not damaged and extend the piston assembly. service life.

Description

A kind of automatic tightening device and tightening method of three-position cylinder piston assembly

technical field

The invention relates to the technical field of piston assembly, in particular to an automatic tightening device and a tightening method for a three-position cylinder piston assembly.

Background technique

Modern commercial aircraft have high requirements for safety, reliability and economy. As a civil aircraft that can be put into airline operation, it must pass the strict examination and approval of relevant civil aviation bureaus. It is one of the core systems of modern aircraft, which is one of the core systems of modern aircraft. It is related to the safety and comfort of the aircraft. It is the object of key review by the airworthiness authorities. demand, its key power actuator actuator needs to serve reliably under severe working conditions such as high oil pressure, high temperature difference, low air pressure, strong corrosive medium, etc. And the stability of assembly quality puts forward more stringent requirements.

The tightening of the piston in the aircraft actuator is a crucial step in the assembly of the flight control hydraulic actuator. The piston assembly is composed of the end ring piston and the tailstock piston. This assembly process directly affects the reliability and life of the actuator. To meet the needs of the production cycle, this assembly process needs to realize the rapid tightening of the tailstock piston and the end ring piston, and accurately control the tightening torque of the tailstock piston and the end ring piston. At present, the piston tightening assembly adopts manual leading, mechanical assistance, and post-inspection methods. , The assembly process of components is completed by manual work by craftsmen.

With the development of aviation technology, the above assembly methods gradually exposed the following problems:

1. The matching threads of the two parts are long, and the manual tightening efficiency is low. It requires workers to hold the parts for a long time to tighten the operation, which is labor-intensive and difficult to work continuously;

2. It is difficult to fix the piston during the tightening operation, and it is easy to damage the parts by relying only on the hands of the workers;

3. The fixed torque tightening tooling currently used is inconvenient to operate, and requires two people to cooperate to complete it;

4. If the post-inspection fails, the components need to be disassembled and re-selected for assembly, which seriously affects the work efficiency and even causes irreversible damage to the parts.

The invention patent with the application number of "202010811956.5" and the title of "Tightening Equipment" discloses a piston tightening device, including a main frame, a tightening mechanism, a clamping mechanism and a lifting mechanism. The tightening mechanism is used to drive the movement of the piece to be tightened. The tightening mechanism is used to clamp the rod-like piece matched with the piece to be tightened, the lifting mechanism drives the tightening mechanism to move up and down, the tightening sleeve at the output end of the tightening gun of the tightening mechanism drives the piece to be tightened to rotate, and then the piece to be tightened is screwed into the rod type However, during the tightening process, the tightening torque cannot be effectively determined, which affects the assembly quality of the piston. Moreover, during the tightening process, the movement of the parts to be tightened is completely affected by the tightening mechanism. When the tightening mechanism moves The generated slight vibration will also be reflected on the part to be tightened, which will affect the accuracy of the piston assembly, and may hard wear the threads and reduce the service life of the piston.

The invention patent with the application number of "201510263231.6" and the title of "a shock absorber piston rod nut tightening device" discloses a piston tightening device, including a bracket, which is used for fixing and supporting a power device, a tightening device and a piston rod fixing device During the tightening process, the piston rod fixing device fixes and clamps the piston rod, and drives the nut to be tightened to rotate through the tightening device, thereby realizing the tightening cooperation between the nut to be tightened and the piston rod. When the torque is less than the initial torque of the torsion spring, the passive rotating part and the active rotating part rotate together without relative rotation. When the tightening nut is tightened to the required standard, the torque of tightening the tightening nut is greater than the initial torque of the torsion spring, and the passive rotating There is relative rotation between the parts and the active rotating parts. At this time, the power supply of the driving motor is disconnected, and the driving motor stops rotating, that is, the assembly of the piston is completed with a certain torque, but the vibration generated by the tightening device is still directly reflected in the On the nut to be tightened, it will affect the accuracy of the piston assembly and reduce the service life of the piston.

Therefore, there is an urgent need for an automatic tightening device and a tightening method for a three-position cylinder piston assembly with high assembly precision and long service life.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an automatic tightening device for a three-position cylinder piston assembly and a tightening method thereof, so as to solve the problems existing in the above-mentioned prior art. It can improve the assembly precision and prolong the service life of the piston assembly.

In order to achieve the above purpose, the present invention provides the following solutions: the present invention provides an automatic tightening device for a three-position ram piston assembly, including a rotating mechanism for driving the non-tightening end of the end ring piston to rotate, and for positioning the tailstock. A positioning mechanism for the non-tightening end of the piston, a driving mechanism for driving the positioning mechanism to move in the direction of piston tightening, and a clamping assembly, the end ring piston and the piston ends of the tailstock piston are provided with at least one of the A clamping assembly, the clamping assembly has an annular clamping end for limiting the radial displacement of the piston rod, the annular clamping end is rotatably connected with the piston rod, and the annular clamping end follows the piston rod During axial movement, the rotating end of the rotating mechanism, the annular clamping end and the positioning end of the positioning mechanism are coaxially arranged.

Preferably, the clamping assembly includes a fixed part, a rotating part and a locking part, one end of the fixed part is hinged with the rotating part, and both the fixed part and the rotating part are provided with semicircular grooves, when the rotating part rotates When buckled on the upper end of the fixed part, the two semicircular grooves are spliced to form the annular clamping end, and the unhinged end of the fixed part and the rotating part is locked by the locking part.

Preferably, the clamping assembly further includes a bushing for protecting the piston rod, the annular clamping end clamps the piston rod through the bushing, and the bushing and the annular clamping end In the rotational connection, the bushing clamps the piston rod, and when the piston rod rotates, there is no relative movement between the bushing and the piston rod.

Preferably, an annular groove is provided on the inner wall surface of the annular clamping end to prevent the bushing from falling off, the bushing is provided with an annular connecting portion matching the annular groove, and the annular connecting portion is arranged on the in the annular groove.

Preferably, the material of the bushing is red copper.

Preferably, the positioning mechanism includes a sliding plate and a positioning block arranged on the sliding plate, the positioning block is spline connected with the non-tightening end of the tailstock piston, and the bottom of the sliding plate is connected with the driving mechanism, The clamping assembly is slidably arranged on the sliding plate.

Preferably, the automatic tightening device further includes a base, the rotating mechanism and the sliding plate are both arranged on the base, and the base is provided with a sliding rail at a position corresponding to the sliding plate, and the sliding plate is slidably arranged on the base. On the sliding rail, the driving mechanism is arranged below the base, and the driving mechanism is an electric cylinder.

Preferably, the rotating mechanism includes a drive motor, a reducer and a tightening head, an output end of the drive motor is connected to the tightening head through the reducer, and the tightening head is the rotating end.

Preferably, a torque sensor is arranged between the speed reducer and the tightening head.

The present invention also provides a method for tightening the automatic tightening device for the three-position cylinder piston assembly, which is characterized in that it includes the following steps:

S1: Set the end ring piston and the piston rod of the tailstock piston on the annular clamping end, connect the tailstock piston to the positioning block, adjust the position of the slide plate on the base, and make the untightened end of the end ring piston close to tightening header, and connect the two;

S2: Start the drive motor, and the tightening head starts to drive the end ring piston to rotate. At this time, by controlling the electric cylinder to control the sliding plate to move towards the end ring piston, the piston starts to be tightened;

S3: During the tightening process, the torque sensor monitors the tightening torque value in real time and feeds it back to the control system, and adjusts the tightening torque in real time to achieve precise torque control, and the annular clamping end can ensure the piston rod in real time through the radial limit of the piston rod. The rod only rotates to ensure assembly accuracy;

S4: After the tightening operation is completed, remove the assembled integral piston and transfer it to the designated position.

The present invention has achieved the following technical effects with respect to the prior art:

1. Both ends of the piston of the middle end ring piston and the tailstock piston of the present invention are provided with at least one clamping assembly, and the clamping assembly has an annular clamping end that restricts the radial displacement of the piston rod. The setting of the annular clamping end Limit the radial displacement of the end ring piston and the piston rod of the tailstock piston, avoiding the radial displacement of the piston rod caused by the vibration generated by the rotating mechanism during the tightening process, which affects the assembly accuracy and causes certain damage to the connecting thread. , which affects the service life of the piston assembly. In addition, the rotating end of the rotating mechanism, the annular clamping end and the positioning end of the positioning mechanism are coaxially arranged, and the positioning mechanism locates the non-tightening end of the tailstock piston, which can also limit the diameter of the piston rod. The effect of radial displacement, that is, the setting of the clamping assembly and the positioning mechanism, simultaneously restricts the radial displacement of the piston rod at multiple points on the integral piston assembly, which greatly improves the accuracy of assembly, and can ensure that the thread is not damaged, extending Service life of the piston assembly.

2. In the present invention, the annular clamping end clamps the piston rod through the bushing, and the bushing and the annular clamping end are rotatably connected, and the bushing clamps the piston rod. When the piston rod rotates, there is no relative relationship between the bushing and the piston rod. The movement eliminates the rotational wear of the clamped part of the piston rod, which is beneficial to ensure the quality of the piston assembly.

3. In the present invention, the clamping assembly is slidably arranged on the slide plate. When facing piston assemblies of different sizes, the position of the clamping assembly can be adjusted when clamping the piston assembly, so that the position of the clamping assembly can be adapted to different sizes. The piston assembly improves the application range of the device.

4. In the present invention, a torque sensor is arranged between the reducer and the tightening head, and the tightening torque can be obtained through the torque sensor, which can realize the precise control of the tightening torque and improve the assembly accuracy.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

Fig. 1 is the structural schematic diagram of the piston assembly of the present invention;

Fig. 2 is the structural schematic diagram of the automatic tightening device of the three-position cylinder piston assembly of the present invention;

3 is a schematic structural diagram of the connection between the clamping assembly and the slide plate of the present invention;

4 is a schematic structural diagram of the connection between the slide plate and the drive mechanism of the present invention;

Among them, 1. end ring piston; 2. tailstock piston; 3. drive motor; 4. reducer; 5. torque sensor; 6. tightening head; 7. sliding plate; 8. clamping assembly; 9. bushing; 10. Slider; 11. Positioning block; 12. Driving mechanism; 13. Skateboard; 14. Slide rail.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide an automatic tightening device and a tightening method for the three-position cylinder piston assembly, so as to solve the problems existing in the prior art, and to ensure the stability of the piston during tightening through the setting of the clamping assembly and the positioning mechanism , Improve the assembly precision and prolong the service life of the piston assembly.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Please refer to Figures 1 to 4 to provide an automatic tightening device for a three-position ram piston assembly, including a rotating mechanism for driving the non-tightening end of the end ring piston 1 to rotate, a rotating mechanism for positioning the tailstock piston 2 The positioning mechanism of the non-tightening end, the driving mechanism 12 for driving the positioning mechanism to move in the direction of piston tightening, and the clamping assembly 8, the rotating mechanism is detachably connected to the non-tightening end of the end ring piston 1, and the positioning mechanism is connected to the non-tightening end of the tailstock piston 2. The tightening end is detachably connected, and both ends of the piston of the end ring piston 1 and the tailstock piston 2 are provided with at least one clamping component 8, the setting position can be selected from the middle of the piston rod on one side of the piston, and the clamping component 8 has a limiting piston rod. The annular clamping end that generates radial displacement, the annular clamping end is rotatably connected with the piston rod, and the annular clamping end follows the piston rod to move axially. The radial displacement of the rod avoids the radial displacement of the piston rod caused by the vibration generated by the rotating mechanism during the tightening process, which affects the assembly accuracy and at the same time causes certain damage to the connecting thread and affects the service life of the piston assembly. The rotating end of the mechanism, the annular clamping end and the positioning end of the positioning mechanism are coaxially arranged. The positioning mechanism locates the non-tightening end of the tailstock piston 2 and can also limit the radial displacement of the piston rod, that is, the clamping assembly 8 And the setting of the positioning mechanism, the multiple points on the integral piston assembly simultaneously limit the radial displacement of the piston rod, which greatly improves the accuracy of assembly, and can ensure that the thread is not damaged and prolong the service life of the piston assembly. When the end ring piston 1 rotates, the driving mechanism 12 drives the positioning mechanism to drive the tailstock piston 2 to move axially toward the end ring piston 1, and the assembly of the end ring piston 1 and the tailstock piston 2 is completed.

The piston assembly can be clamped by the clamp assembly 8 and positioned by the positioning mechanism in a pre-tightened state.

In order to facilitate the clamping of the piston assembly to be tightened and the disassembly of the fully tightened piston assembly, the clamping assembly 8 includes a fixed part, a rotating part and a locking part, one end of the fixed part is hinged with the rotating part, and both the fixed part and the rotating part are provided with Semicircular groove, when the rotating part is rotated and buckled on the upper end of the fixed part, the two semicircular grooves are joined together to form a ring-shaped clamping end, and the unhinged end of the fixed part and the rotating part is locked by the locking part. Put it into the semicircular groove of the fixed part, buckle the rotating part, and use the locking part to lock the fixed part and the rotating part to complete the clamping of the piston assembly. The locking portion can be a locking bolt.

Since the piston rod and the annular clamping end may be relatively rotated to cause certain damage to the surface of the piston rod, in order to avoid damage to the piston rod, the clamping assembly 8 also includes a bushing 9 for protecting the piston rod, and the ring clamp The holding end clamps the piston rod through the bushing 9, the bushing 9 is rotatably connected with the annular clamping end, and the bushing 9 clamps the piston rod. When the piston rod rotates, there is no relative movement between the bushing 9 and the piston rod. The sleeve 9 replaces the piston rod to generate relative rotation with the annular clamping end, which eliminates the rotational wear of the clamped part of the piston rod, and is beneficial to ensure the quality of the piston assembly.

Since the bushing 9 and the piston rod are in a tight state, and the bushing 9 is rotatably connected to the annular clamping end, in order to avoid the axial movement of the piston assembly, the bushing 9 is disengaged from the annular clamping end, and inside the annular clamping end An annular groove is provided on the wall surface to prevent the bushing 9 from falling off. The bushing 9 is provided with an annular connecting portion matching the annular groove, and the annular connecting portion is arranged in the annular groove.

The cross section of the annular groove can be T-shaped or trapezoidal, which enhances the connection stability between the bushing 9 and the annular clamping end.

In order to reduce the wear of the bushing 9, lubricating oil can be added in the annular groove.

Since the piston rod needs to move axially during the tightening process, there may be a slight relative movement between the bushing 9 and the piston rod, which may wear the piston rod. In order to ensure the quality of the piston rod, the material of the bushing 9 is selected. The red copper with lower hardness can protect the surface of the piston rod when the relative movement between the bushing 9 and the piston rod occurs while ensuring a certain holding force.

The positioning mechanism includes a sliding plate 13 and a positioning block 11 arranged on the sliding plate 13. The non-tightening end of the tailstock piston 2 is provided with a spline, and the positioning block 11 is splined to the non-tightening end of the tailstock piston 2, which is convenient for installation and removal. The bottom of the sliding plate 13 is connected with the driving mechanism 12, and the clamping assembly 8 is slidably arranged on the sliding plate 13. When facing piston assemblies of different sizes, the position of the clamping assembly 8 can be adjusted when clamping the piston assembly to make the clamping The position of the assembly 8 can be adapted to piston assemblies of different sizes, which improves the application range of the device.

The sliding assembly structure of the clamping assembly 8 and the sliding plate 13 is as follows: the sliding plate 13 is provided with two sliding plates 7 , the opposite surfaces of the two sliding plates 7 are provided with sliding grooves, and the bottom of the fixed part is arranged between the two sliding plates 7 , and a slider 10 is provided at the bottom of the fixed portion corresponding to the position of the sliding groove.

The automatic tightening device also includes a base, the upper surface of the base is horizontally arranged, the rotating mechanism and the sliding plate 13 are all arranged on the base, and the position of the base corresponding to the sliding plate 13 is provided with a sliding rail 14, the sliding plate 13 is slidably arranged on the sliding rail 14, and the driving mechanism 12 is arranged under the base to reduce the space occupation in the opposite direction, which is beneficial to provide a larger operating space for the operator. The base is provided with a port at the position corresponding to the movement path of the driving end of the driving mechanism 12, and the end of the slide plate 13 is provided with a direction. The lower bent part is connected to the driving end of the driving mechanism 12 through the through opening, and the driving mechanism 12 is an electric cylinder.

The rotating mechanism includes a drive motor 3, a reducer 4 and a tightening head 6. The drive motor 3 selects a servo motor. The output end of the servo motor is connected to the tightening head 6 through the reducer 4. The tightening head 6 is the rotating end. The tightening end is provided with splines, and the tightening head 6 is spline-connected with the non-tightening end of the end ring piston 1, which is convenient for disassembly and installation.

A torque sensor 5 is arranged between the reducer 4 and the tightening head 6. Both the reducer 4 and the tightening head 6 are connected to the torque sensor 5 through a coupling, and the tightening torque can be obtained through the torque sensor 5, which can realize precise control of the tightening torque , improve the assembly accuracy.

The drive motor 3, the reducer 4, the torque sensor 5 and the tightening head 6 are all supported on the base through the support seat.

The present invention also provides a method for tightening the automatic tightening device for the three-position cylinder piston assembly, comprising the following steps:

S1: Through the cooperation between the fixed part and the rotating part, set the piston rod of the end ring piston 1 and the tailstock piston 2 on the annular clamping end, and adjust the position of the clamping assembly 8 on the slide plate 13 to make the tailstock piston 2 The non-tightening end of the end ring is close to the positioning block 11, and the tailstock piston 2 is connected to the positioning block 11, and the position of the sliding plate 13 on the base is adjusted by the electric cylinder, so that the untightening end of the end ring piston 1 is close to the tightening head 6, and the connect both;

S2: Start the drive motor 3, and the tightening head 6 starts to drive the end ring piston 1 to rotate. Due to the restriction of the radial movement of the piston rod by the annular clamping end and the positioning block 11, even if the drive motor 3 generates vibration, the vibration is transmitted to the piston rod. When the end ring piston 1 and the tailstock piston 2 are assembled, they only move relative to each other in the axial direction. At this time, the electric cylinder is controlled to control the sliding plate 13 toward the end ring piston. 1. Start to tighten the piston. During the tightening operation, use step-by-step tightening in order to improve the work efficiency. At the large speed required by the process, use a small torque to quickly tighten the piston assembly to the set small torque, and then use the assembly required. Rated torque, tighten the piston assembly at low speed;

S3: During the tightening process, the torque sensor 5 monitors the tightening torque value in real time and feeds it back to the control system, and adjusts the tightening torque in real time to achieve precise torque control. The piston rod only rotates to ensure assembly accuracy;

S4: After the tightening operation is completed, open the rotating part, remove the assembled integral piston and transfer it to the designated position.

Adaptive changes made according to actual needs are all within the protection scope of the present invention.

It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. . Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In the present invention, specific examples are used to illustrate the principles and implementations of the present invention, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; There will be changes in the specific implementation manner and application scope of the idea of the invention. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. An automatic tightening device for a three-position ram piston assembly, characterized in that it comprises a rotating mechanism for driving the non-tightening end of the end ring piston to rotate, a positioning mechanism for positioning the non-tightening end of the tailstock piston, a In order to drive the positioning mechanism to move along the piston tightening direction and the clamping assembly, both ends of the piston of the end ring piston and the tailstock piston are provided with at least one clamping assembly. There is an annular clamping end that restricts the radial displacement of the piston rod, the annular clamping end is rotatably connected with the piston rod, and the annular clamping end follows the piston rod to move axially, and the rotating mechanism The rotating end, the annular clamping end and the positioning end of the positioning mechanism are coaxially arranged. 2 . The automatic tightening device for the three-position jack-piston assembly according to claim 1 , wherein the clamping assembly comprises a fixed part, a rotating part and a locking part, and one end of the fixed part is connected to the The rotating part is hinged, and both the fixed part and the rotating part are provided with a semicircular groove. When the rotating part is rotated and fastened to the upper end of the fixed part, the two semicircular grooves are joined together to form the annular clamping end, and the fixed part and the The unhinged end of the rotating part is locked by the locking part. 3. The automatic tightening device for the three-position jack-piston assembly according to claim 2, wherein the clamping assembly further comprises a bushing for protecting the piston rod, and the annular clamping end passes through The bushing clamps the piston rod, the bushing is rotatably connected to the annular clamping end, the bushing clamps the piston rod, and when the piston rod rotates, the bushing and the There is no relative movement between the piston rods. 4 . The automatic tightening device for the three-position jack-piston assembly according to claim 3 , wherein the inner wall surface of the annular clamping end is provided with an annular groove to prevent the bushing from falling off, and the bushing An annular connecting portion matching the annular groove is provided on the upper surface, and the annular connecting portion is arranged in the annular groove. 5 . The automatic tightening device for the three-position cylinder piston assembly according to claim 3 , wherein the material of the bushing is red copper. 6 . 6 . The automatic tightening device for the three-position jack-piston assembly according to claim 1 , wherein the positioning mechanism comprises a sliding plate and a positioning block arranged on the sliding plate, the positioning block and the tail The non-tightening end of the seat piston is connected with splines, the bottom of the sliding plate is connected with the driving mechanism, and the clamping assembly is slidably arranged on the sliding plate. 7. The three-position jack-piston assembly automatic tightening device according to claim 6, wherein the automatic tightening device further comprises a base, and the rotating mechanism and the sliding plate are both arranged on the base, The base is provided with a slide rail at a position corresponding to the slide plate, the slide plate is slidably arranged on the slide rail, and the drive mechanism is set under the base, and the drive mechanism is an electric cylinder. 8 . The three-position jack-piston assembly automatic tightening device according to claim 1 , wherein the rotating mechanism comprises a drive motor, a reducer and a tightening head, and the output end of the drive motor passes through the speed reducer. 9 . The device is connected with the tightening head, and the tightening head is the rotating end. 9 . The three-position jack-piston assembly automatic tightening device according to claim 8 , wherein a torque sensor is arranged between the speed reducer and the tightening head. 10 . 10. A method for tightening an automatic tightening device for a three-position ram piston assembly, characterized in that it comprises the following steps: S1: Set the end ring piston and the piston rod of the tailstock piston on the annular clamping end, connect the tailstock piston to the positioning block, adjust the position of the slide plate on the base, and make the untightened end of the end ring piston close to tightening header, and connect the two; S2: Start the drive motor, and the tightening head starts to drive the end ring piston to rotate. At this time, by controlling the electric cylinder to control the sliding plate to move towards the end ring piston, the piston starts to be tightened; S3: During the tightening process, the torque sensor monitors the tightening torque value in real time and feeds it back to the control system, and adjusts the tightening torque in real time to achieve precise torque control, and the annular clamping end can ensure the piston rod in real time through the radial limit of the piston rod. The rod only rotates to ensure assembly accuracy; S4: After the tightening operation is completed, remove the assembled integral piston and transfer it to the designated position.

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