A double-acting hydraulic riveter suitable for detecting rivet displacement

Abstract

The application provides a double-acting hydraulic riveting gun suitable for detecting riveting displacement of a pull-out rivet, which is provided with a displacement sensor. A displacement sensor core of the displacement sensor can be driven by a pulling shaft of the riveting gun to move forward and backward in a displacement sensor body. The displacement sensor can measure displacement of the pulling shaft by changing relative positions of the displacement sensor body and the displacement sensor core, and export the measurement data. The double-acting hydraulic riveting gun suitable for detecting riveting displacement of a pull-out rivet fixes the displacement sensor core in the displacement sensor with the pulling shaft, drives the displacement sensor core to move by the pulling shaft, changes the relative positions of the displacement sensor core and the displacement sensor body, realizes riveting displacement detection in the "pushing" and "pulling" processes of the double-acting riveting gun, and obtains specific displacement values in the riveting process, so as to guide improvement of riveting stability of products and improvement of the qualified rate of riveting.

Description

Technical Field

[0001] This invention relates to the field of fastener assembly and connection technology, and in particular to a double-action hydraulic riveting gun suitable for detecting displacement of pull-pin riveting. Background Technology

[0002] With the development of aerospace technology, single-sided connection technology is being used more and more widely in this field. This is not only because it has typical advantages such as high installation efficiency, light weight, and high reliability, but also because single-sided connection technology can effectively reduce the number of holes required due to the increased process path and space for double-sided implementation, thus effectively improving the integrity of the aircraft structure. Among them, the riveting qualification rate of the pulled studs is a key characteristic that determines the success of single-sided connection technology, and the displacement value during the riveting process can directly affect the riveting effect of the pulled studs, thereby affecting the riveting qualification rate. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects existing in the prior art and provide a double-action hydraulic riveting gun suitable for detecting the displacement of riveting pins, so as to realize the detection of riveting displacement during the "push" and "pull" process of the double-action riveting gun.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A double-acting hydraulic riveting gun suitable for detecting displacement in pull-pin riveting, comprising: Thrust cylinder; A tension shaft is disposed inside the thrust cylinder and extends from the front end of the thrust cylinder. The tension shaft can move back and forth along the axial direction of the thrust cylinder. The displacement sensor includes a displacement sensor body and a displacement sensor core. The displacement sensor body is fixed to the side of the thrust cylinder, and the displacement sensor core is inserted into a groove opened in the displacement sensor body and can slide along the groove. The iron core extension rod has one end inserted into the displacement sensor body and fixedly connected to the displacement sensor iron core, and the other end fixed to the tension shaft through the iron core connecting seat; the displacement sensor iron core can move back and forth under the drive of the tension shaft; The displacement sensor can measure the displacement of the tension shaft by changing the relative position of the sensor body and the sensor core, and then export the measurement data.

[0005] Furthermore, the rear end of the tension shaft is provided with a protruding piston portion, and the circumferential outer wall of the piston portion is in sealed sliding contact with the inner wall of the thrust cylinder. The rivet gun also includes a cylinder body, which is disposed outside the thrust cylinder. A first oil inlet chamber and a second oil inlet chamber are provided between the cylinder body and the thrust cylinder. The first oil inlet chamber and the second oil inlet chamber are respectively connected to an oil pipe, and the first oil inlet chamber and the second oil inlet chamber are respectively connected to the front and rear ends of the thrust cylinder, which can push the piston part and the tension shaft to move back and forth.

[0006] Furthermore, the double-action hydraulic riveting gun suitable for detecting the displacement of riveting pins further includes a thrust shaft with a protruding rear end extending into the thrust cylinder and fixedly connected to the front end of the thrust cylinder; the protruding part of the thrust shaft is provided with a first oil inlet hole, which passes through the front and rear sides of the protruding part of the thrust shaft, and the hydraulic oil in the first oil inlet chamber can enter the gap between the rear end protrusion of the thrust shaft and the piston part through the first oil inlet hole, pushing the pulling shaft to move backward; the protruding part of the thrust shaft is provided with a guide hole, and a limiting pin is inserted in the guide hole. The limiting pin can limit the forward movement distance of the pulling shaft by abutting, so that the protruding part of the thrust shaft and the piston part form a first pushing oil chamber through separation.

[0007] Furthermore, a third oil inlet hole is provided on the thrust cylinder corresponding to the second oil inlet chamber. The third oil inlet hole connects the inside and outside of the thrust cylinder. The hydraulic oil in the second oil inlet chamber can enter the thrust cylinder behind the piston through the third oil inlet hole, pushing the pulling force axis to move forward. The rivet gun also includes a stop, which is fixed to the rear end of the thrust cylinder and can limit the distance of the axial movement of the tension by abutting against it. The third oil inlet is provided on the side wall of the thrust cylinder on the outer periphery of its location.

[0008] Furthermore, the double-action hydraulic riveting gun suitable for detecting the displacement of riveting pins also includes a shift valve core, which is inserted into a socket at the rear end of the tension shaft. The front end of the shift valve core has a protrusion, and the rear end extends out of the socket. A first receiving cavity is opened in the tension shaft, and a push spring is provided in the first receiving cavity. The push spring abuts against the protrusion.

[0009] Furthermore, the first receiving cavity is connected to the first oil inlet cavity for conveying hydraulic oil.

[0010] Furthermore, the double-acting hydraulic riveting gun suitable for detecting the displacement of the rivet joint also includes a stop, which is disposed at the rear end of the thrust cylinder and can limit the distance of the axial backward movement of the tension by abutting, and the front and rear positions of the stop are adjustable; The stop includes: Release piston, which is fixed to the rear end of the thrust cylinder; A stroke limiting shaft is disposed inside the release piston. The circumferential position of the stroke limiting shaft is fixed, and it can move back and forth along the axial direction of the thrust cylinder. The stroke adjustment shaft is located inside the release piston and is threadedly connected to the stroke limit shaft. By turning the stroke adjustment shaft, the stroke limit shaft can be driven to move back and forth.

[0011] Furthermore, the stroke adjustment shaft is sleeved inside the stroke limiting shaft, and the rear end of the stroke limiting shaft is provided with a second push oil chamber composed of the outer wall of the stroke adjustment shaft and the inner wall of the release piston. The shaft portions of the stroke limiting shaft and the stroke adjustment shaft are provided with slots that connect the two. The rear end side wall of the stroke adjustment shaft is provided with a fifth oil inlet hole, which connects the slot to the second push oil chamber.

[0012] Furthermore, the double-acting hydraulic riveting gun suitable for detecting the displacement of the riveting pin also includes a return spring, which is located inside the thrust cylinder, with its two ends respectively abutting against the tension shaft and the bottom end of the thrust cylinder, and can provide thrust for the forward movement of the tension shaft.

[0013] Furthermore, the double-action hydraulic riveting gun suitable for detecting the displacement of riveting pins also includes a guide column, one end of which is fixed to the iron core connecting seat, and the other end is inserted into the housing of the riveting gun, arranged parallel to the displacement sensor, and can move back and forth in the housing along the moving direction of the displacement sensor.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a double-action hydraulic riveting gun suitable for detecting the displacement of riveting pins. The displacement sensor core in the displacement sensor is fixed to the tension shaft. The tension shaft drives the displacement sensor core to move, thereby changing the relative position of the displacement sensor core and the displacement sensor body. This enables the detection of riveting displacement during the "push" and "pull" processes of the double-action riveting gun, obtaining the specific displacement value during the riveting process. This provides guidance for improving the riveting stability of products and thus improving the riveting qualification rate. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 2 This is an exploded view of a double-acting hydraulic riveting gun suitable for detecting displacement in tapped riveting, as described in this invention. Figure 3This is a cross-sectional structural diagram of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 4 This is a cross-sectional structural diagram of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention, from another perspective. Figure 5 This is a cross-sectional view of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 6 This is a schematic diagram of the pull head fixing ring structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 7 This is a schematic diagram of the protective cover structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 8 This is a schematic diagram of a limiting pin structure for a double-acting hydraulic riveting gun suitable for detecting displacement of riveted pins, as described in this invention. Figure 9 This is a schematic diagram of the overall structure of the tension shaft of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 10 This is a schematic diagram of the shift valve core structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 11 This is a schematic diagram of the core connecting seat structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 12 This is a schematic diagram of the core extension rod structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 13 This is a schematic diagram of the guide column structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 14 This is a schematic diagram of the cylinder structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 15 This is a schematic diagram of the grooved cover structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 16 This is a schematic diagram of the displacement sensor core structure of a double-acting hydraulic riveting gun suitable for detecting displacement during riveting of rivets, as described in this invention. Figure 17 This is a schematic diagram of the displacement sensor body structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 18This is a schematic diagram of a sensor support ring structure for a double-acting hydraulic riveting gun suitable for detecting displacement during riveting of rivets, as described in this invention. Figure 19 This is a schematic diagram of a pre-tightening bushing structure for a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 20 This is a schematic diagram of the set bolt structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 21 This is a schematic diagram of a pre-tightening plug structure for a double-acting hydraulic riveting gun suitable for detecting displacement of riveted pins, as described in this invention. Figure 22 This is a schematic diagram of the protective locking ring structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 23 This is a schematic diagram of the pull head connecting sleeve structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 24 This is a schematic diagram of the thrust shaft structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted rivets, as described in this invention. Figure 25 This is a schematic diagram of the shift valve seat structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 26 This is a schematic diagram of the reset spring structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 27 This is a schematic diagram of the control button structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 28 This is a schematic diagram of the first fixing bolt structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 29 This is a schematic diagram of a waterproof joint structure for a double-acting hydraulic riveting gun suitable for detecting displacement of rivet joints, as described in this invention. Figure 30 This is a schematic diagram of the oil pipe structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 31 This is a schematic diagram of the operating handle structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 32 This is a schematic diagram of the thrust cylinder structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted nails, as described in this invention. Figure 33 This is a schematic diagram of the stroke limiting shaft structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 34 This is a schematic diagram of the stroke adjustment shaft structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 35 This is a schematic diagram of the release piston structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 36 This is a schematic diagram of the rear end cap structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention. Figure 37 This is a schematic diagram of the indexing washer structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 38 This is a schematic diagram of the second fixing bolt structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 39 This is a schematic diagram of the adjustment knob structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 40 This is a schematic diagram of the adjuster ring structure of a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins, as described in this invention. Figure 41 This is a schematic diagram of the fixed retaining spring and knob structure of a double-action hydraulic riveting gun suitable for detecting the displacement of riveting pins, as described in this invention.

[0016] Explanation of reference numerals in the attached figures: 1-Pull head fixing ring; 2-Guard cover; 3-Limit pin; 4-Pull shaft; 41-First receiving cavity; 42-Counterhead; 5-Shift valve core; 51-Push spring; 6-Core connecting seat; 7-Core extension rod; 8-Guide post; 9-Cylinder body; 91-First oil inlet cavity; 92-Secondary cavity; 10-Wire groove guard; 11-Displacement sensor core; 12-Displacement sensor body; 121-Sealing plug; 13-Sensor support ring; 14-Pre-tightening bushing; 15-Setting bolt; 16-Pre-tightening plug; 17-Guard cover locking ring; 18-Pull head connecting sleeve; 181-First clearance hole; 19-Thrust shaft; 191-Second clearance hole; 192-First oil inlet hole; 193-Guide hole; 2 0-Shift valve seat; 201-Second oil inlet; 21-Reset spring; 22-Control button; 23-First fixing bolt; 24-Waterproof connector; 25-Oil pipe; 26-Operating handle; 261-Oil passage; 262-Line pipe; 27-Thrust cylinder; 271-Second oil inlet chamber; 272-Third oil inlet; 28-Stroke limit shaft; 29-Stroke adjustment shaft; 291-Fourth oil inlet; 292-Fifth oil inlet; 30-Release piston; 31-Rear end cover; 32-Index washer; 33-Second fixing bolt; 34-Adjusting knob; 35-Adjuster ring; 36-Fixing snap ring; 100-First pushing oil chamber; 200-Second pushing oil chamber; 300-Second receiving chamber. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figures 1-41 As shown, this embodiment provides a double-acting hydraulic riveting gun suitable for detecting the displacement of riveted pins. The riveting gun includes a housing consisting of a cylinder body 9 and a protective cover 2 fixedly assembled. The cylinder body 9 in the housing includes a main cavity and a secondary cavity 92 disposed on the side of the main cavity. The protective cover 2 is fastened to the front end of the cylinder body 9. A rear end cover 31 is fixedly assembled to the rear end of the cylinder body 9. An operating handle 26 is fixedly assembled to the bottom of the cylinder body 9 by a first fixing bolt 23. The operating handle 26 has two oil passages 261, which are respectively connected to oil pipes 25.

[0021] In addition, a wire harness conduit can be installed on the front side of the handle for the rivet gun's wiring. A waterproof connector 24 is provided at the bottom opening of the wire harness conduit, and a control button 22 can be installed on the outside of the handle, electrically connected to the wire harness inside the conduit. The control button 22 controls the connection and disconnection of the wire harness, thereby controlling the start and stop of the rivet gun. It is worth noting that this embodiment does not involve the specific structure of the wire harness conduit and the control button 22, nor their operation; it merely provides a preferred placement for embodiments requiring the wire harness conduit and control button 22. Other parts can be configured according to existing technology.

[0022] In this embodiment, a pull head connecting sleeve 18 is fixedly mounted on the front end of the main cavity of the cylinder body 9. The pull head connecting sleeve 18 extends from the front end of the protective cover 2, forming a second receiving cavity 300 between the pull head connecting sleeve 18 and the protective cover 2. Furthermore, the portion of the pull head connecting sleeve 18 located outside the protective cover 2 has a protective cover 2 locking ring screwed onto its outer circumference, and a pull head fixing ring 1 is fixedly mounted on the front end of the pull head connecting sleeve 18. In this embodiment, a thrust cylinder 27 is provided inside the main cavity of the cylinder body 9, and a thrust shaft 19 is provided inside the pull head connecting sleeve 18. The rear end of the thrust shaft 19 extends into the thrust cylinder 27 and is fixedly connected to the thrust cylinder 27 by threads. A pull shaft 4 is provided inside the thrust shaft 19, and the rear end of the pull shaft 4 extends into the thrust cylinder 27 and can move back and forth along the axial direction of the thrust cylinder 27.

[0023] For example, in the rivet gun provided in this embodiment, a clamping sleeve and claws can be provided at the front end of the tension shaft 4, as shown in patent 201710503272.7 - "Electric Rivet Gun", to complete the riveting operation of the pop rivet. Of course, in other embodiments, other existing structures can also be used to supplement the rivet gun structure in this embodiment, and no limitations are imposed here.

[0024] In this embodiment, a displacement sensor is provided in the secondary cavity 92 of the cylinder 9. The displacement sensor includes a displacement sensor body 12 and a displacement sensor core 11. The displacement sensor body 12 is fixed in the secondary cavity 92, and the displacement sensor core 11 is inserted into a sliding groove opened in the displacement sensor body 12 and can slide along the sliding groove.

[0025] The second receiving cavity 300 formed between the pull head connecting sleeve 18 and the protective cover 2 is provided with an iron core extension rod 7. One end of the iron core extension rod 7 is inserted into the displacement sensor body 12 and fixedly connected to the displacement sensor iron core 11. The other end is fixed to the tension shaft 4 through the iron core connecting seat 6. The displacement sensor iron core 11 can move back and forth under the drive of the tension shaft 4.

[0026] In this embodiment, the displacement sensor can measure the displacement of the tension shaft 4 by changing the relative position of the displacement sensor body 12 and the displacement sensor core 11, and export the measurement data through transmission lines or other means, displaying it on a display device connected to the displacement sensor. Specifically, this displacement sensor is a mechanical displacement sensor, and its internal structure and working principle are existing technologies, which will not be described in detail here. For example, the mechanical displacement sensor model JG-GC-CGQ-BZ from Sichuan Tengfike Technology Co., Ltd. can be used.

[0027] The double-action hydraulic riveting gun provided in this embodiment is suitable for detecting the displacement of riveting pins. The displacement sensor core 11 in the displacement sensor is fixed to the tension shaft 4. The tension shaft 4 drives the displacement sensor core 11 to move, thereby changing the relative position of the displacement sensor core 11 and the displacement sensor body 12. This realizes the detection of riveting displacement during the "push" and "pull" process of the double-action riveting gun, obtains the specific displacement value during the riveting process, and thus guides the improvement of product riveting stability, thereby improving the riveting qualification rate.

[0028] Specifically, in this embodiment, the pull head connecting sleeve 18 is provided with a first clearance hole 181, and the thrust shaft 19 is provided with a second clearance hole 191, so that the iron core connecting seat 6 can be fixedly assembled on the tension shaft 4. Moreover, the first clearance hole 181 and the second clearance hole 191 extend along the moving direction of the tension shaft 4 to avoid obstructing the displacement of the iron core connecting seat 6.

[0029] More specifically, the tension shaft 4 is provided with a countersunk hole 42, the lower bent end of the iron core connecting seat 6 is placed horizontally in the countersunk hole 42, and the iron core connecting seat 6 and the tension shaft 4 are assembled and fixed by screws, and the height of the screws is lower than the depth of the countersunk hole 42 to avoid hindering its movement.

[0030] In this embodiment, the front end of the displacement sensor is sealed and positioned by a sealing plug 121 set in the sub-cavity 92, the rear end of the displacement sensor is provided with a sensor support ring 13, and a pre-tightening bushing 14 is set behind the sensor support ring 13 to accommodate the tip of the displacement sensor. Finally, the displacement sensor is positioned by tightening the pre-tightening bushing 14 and the sensor support ring 13 by screwing the pre-tightening plug 16 at the rear end of the sub-cavity 92.

[0031] As a preferred embodiment, this embodiment also includes a guide post 8. One end of the guide post 8 is fixed to the iron core connecting seat 6, and the other end is inserted into the side wall of the sub-cavity 92, parallel to the displacement sensor. It can move back and forth in the side wall of the sub-cavity 92 along the moving direction of the displacement sensor, providing guidance for the movement of the iron core extension rod 7.

[0032] Furthermore, in this embodiment, a notch may be reserved on the sub-cavity 92, and a wire groove cover 102 may be fastened to the notch to accommodate the transmission line and / or wire of the displacement sensor. For example, the wire groove cover 102 may be assembled and fixed by a set bolt 15 that passes through the wire groove cover 102 and is screwed into the side wall of the sub-cavity 92.

[0033] In this embodiment, a first oil inlet chamber 91 and a second oil inlet chamber 271 are provided between the cylinder body 9 and the thrust cylinder 27. The first oil inlet chamber 91 is located at the front end of the cylinder body 9, and the second oil inlet chamber 271 is located at the rear end of the cylinder body 9. Both are formed by an annular recess on the inner wall of the cylinder body 9 and / or an annular groove on the thrust cylinder 27. The first oil inlet chamber 91 and the second oil inlet chamber 271 are respectively connected to two oil pipes 25 provided in the operating handle 26.

[0034] Meanwhile, in this rivet gun, the rear end of the thrust shaft 19 protrudes, and the outer circumference of the protrusion is threaded. It is assembled and fixed to the thrust cylinder 27 through the thread, and the protrusion is separated from the rear end of the pull head connecting sleeve 18 to form a gap, which is connected to the first oil inlet chamber 91. The rear end of the pull shaft 4 is provided with a protruding piston part. The circumferential outer wall of the piston part is in sealed sliding contact with the inner wall of the thrust cylinder 27, and the piston part and the rear end of the thrust shaft 19 are separated to form the first push oil chamber 100.

[0035] In this embodiment, the protruding part of the thrust shaft 19 is provided with a plurality of guide holes 193, and a limiting pin 3 is inserted in the guide hole 193. Both ends of the limiting pin 3 are free ends, which can limit the forward movement distance of the pulling shaft 4 by abutting against the piston part and the pull head connecting sleeve 18 respectively, so that the protruding part of the thrust shaft 19 and the piston part are separated to form the first pushing oil chamber 100.

[0036] Furthermore, the front end of the limiting pin 3 is provided with a protruding cap end, the diameter of which is larger than the diameter of the guide hole 193, which can prevent the limiting pin 3 from coming out of the guide hole 193 backward; and the length of the limiting pin 3 is greater than the distance between the protruding part of the thrust shaft 19 and the pull head connecting sleeve 18, which can prevent the limiting pin 3 from coming out of the guide hole 193 forward.

[0037] The protruding portion of the thrust shaft 19 is provided with a first oil inlet hole 192, which extends through both the front and rear sides of the protruding portion of the thrust shaft 19. This allows hydraulic oil in the first oil inlet chamber 91 to enter the first push oil chamber 100 through the first oil inlet hole 192, thereby pushing the tension shaft 4 to move backward. A third oil inlet hole 272 is provided on the thrust cylinder 27 corresponding to the second oil inlet chamber 271. This third oil inlet hole 272 connects the inside and outside of the thrust cylinder 27, allowing hydraulic oil in the second oil inlet chamber 271 to enter the thrust cylinder 27 behind the piston through the third oil inlet hole 272, thereby pushing the tension shaft 4 to move forward. Therefore, the riveting gun can control the forward and backward displacement of the tension shaft 4 by controlling the hydraulic oil entering and exiting the two oil pipes 25.

[0038] Meanwhile, in this embodiment, a stop is provided at the rear end of the thrust cylinder 27. This stop can limit the distance that the tension shaft 4 moves backward by abutting, and is used to connect the second oil inlet chamber 271 with the third oil inlet hole 272 inside the thrust cylinder 27. The third oil inlet hole 272 is located on the side wall of the thrust cylinder 27 on the outer periphery of its position, so that the third oil inlet hole 272 is always located behind the piston part, and can push the piston part and the tension shaft 4 forward by the injected hydraulic oil.

[0039] As a preferred embodiment, the rivet gun provided in this embodiment also includes a return spring 21, which is located inside the thrust cylinder 27. Its two ends abut against the piston part of the tension shaft 4 and the bottom end of the thrust cylinder 27, respectively. It can provide thrust for the forward movement of the tension shaft 4 and provide an auxiliary function for pushing the tension shaft 4 forward.

[0040] The riveting gun provided in this embodiment also includes a shift valve core and a shift valve seat 20. The shift valve seat 20 is fixedly mounted in the mounting hole of the piston portion, and the shift valve core is inserted into the insertion hole of the shift valve seat 20. The front end of the shift valve core has a protrusion, and the rear end extends out of the insertion hole. A first receiving cavity 41 is provided in the tension shaft 4 at the front end of the mounting hole. A push spring 51 in a compressed state is provided in the first receiving cavity 41. The push spring 51 abuts against the protrusion at the front end of the shift valve core, so that the shift valve core can elastically abut against the release piston 30.

[0041] As a preferred embodiment, the tension shaft 4 is provided with a plurality of second oil inlet holes 201, and the first receiving cavity 41 is connected to the first pushing oil cavity 100 through the second oil inlet holes 201, so that the hydraulic oil in the first oil inlet cavity 91 can enter the first receiving cavity 41, providing further buffering force for the shift valve core.

[0042] In the rivet gun provided in this embodiment, the front-to-back distance of the stop is adjustable. Specifically, the stop includes a release piston 30, a stroke limiting shaft 28, and a stroke adjusting shaft 29. The release piston 30 is fixed between the thrust cylinder 27 and the rear end cover 31 at the end of the cylinder body 9. The stroke limiting shaft 28 is disposed inside the release piston 30 and sleeved inside the stroke adjusting shaft 29. The stroke limiting shaft 28 is threadedly connected to the stroke limiting shaft 29. The circumferential position of the stroke limiting shaft 28 is fixed, and it can move back and forth along the axial direction of the thrust cylinder 27. The stroke limiting shaft 28 can be driven to move back and forth by turning the stroke adjusting shaft 29.

[0043] Of course, in other embodiments, other existing retractable structures can also be used as retractable stops, such as cylinders, electric push rods and lead screws, etc. Alternatively, a nut can be set at the rear end of the thrust cylinder 27, and a lead screw can be screwed inside it. The lead screw passes through the inside and outside of the thrust cylinder 27. During use, the distance it extends into the thrust cylinder 27 can be adjusted by turning the lead screw.

[0044] In this embodiment, the extreme position of the displacement of the stroke limit shaft 28 can be adjusted by combining the displacement data of the displacement sensor and the riveting effect of the riveting gun, thereby adjusting the riveting limit distance of the tension shaft 4 to obtain the best riveting effect.

[0045] Specifically, the outer periphery of the stroke limiting shaft 28 is a non-cylindrical structure with a polygonal cross-section, or the circumferential position of the stroke limiting shaft 28 is limited by setting a slide groove and a slider, so that it can only move back and forth along the axial direction of the thrust cylinder 27.

[0046] Specifically, a second fixing bolt 33 is fixedly mounted at the rear end of the stroke adjustment shaft 29. The cap of the second fixing bolt 33 is located outside the rear end cover 31. By turning the second fixing bolt 33, the stroke adjustment shaft 29 can be rotated, thereby driving the stroke limit shaft 28 to move back and forth. Preferably, an indexing washer 32 is fixed on the second fixing bolt 33, and an adjustment knob 34 is provided on the indexing washer 32 to facilitate the operator to turn the second fixing bolt 33. More preferably, the middle part of the adjustment knob 34 is inserted into the shaft part of the second fixing bolt 33, and the outer end of the adjustment knob 34 is fixed to the indexing washer 32, so as to reduce the turning force by using a lever.

[0047] As a preferred embodiment, in this embodiment, an adjuster ring 35 is fixedly provided on the outer ring of the rear cover 31. The adjuster ring 35 has a slot along its circumferential inner wall. A fixing spring 36 is provided in the slot. The fixing spring 36 is tensioned in the slot and has a bend. The tip of the adjusting knob 34 on the outer circumference is locked in the bend. The rotation of the adjusting knob 34 is restricted by the fixing spring 36, which prevents accidental activation.

[0048] As a preferred embodiment, in this embodiment, the stroke adjustment shaft 29 is sleeved inside the stroke limiting shaft 28. The rear end of the stroke limiting shaft 28 is provided with a second push oil chamber 200 composed of the outer wall of the stroke adjustment shaft 29 and the inner wall of the release piston 30. The front end of the stroke limiting shaft 28 is provided with a fourth oil inlet hole 291. A deep groove is provided on the stroke adjustment shaft 29 from its front end to its rear end. The fourth oil inlet hole 291 and the deep groove form a slot that connects the stroke limiting shaft 28 and the stroke adjustment shaft 29. A fifth oil inlet hole 292 is provided on the side wall at the rear end of the deep groove. The fifth oil inlet hole 292 connects the slot with the second push oil chamber 200, so that the hydraulic oil in the thrust cylinder 27 can enter the second push oil chamber 200 to provide a buffering effect for the stroke limiting shaft 28.

[0049] Note: Unless otherwise specified, the fixed assembly methods described in this article shall be existing fixed connection methods such as threaded connection, welding, and bonding.

[0050] 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-acting hydraulic riveting gun suitable for detecting displacement in riveting of pulled rivets, characterized in that, include: Thrust cylinder (27); A tension shaft (4) is disposed inside the thrust cylinder (27) and extends from the front end of the thrust cylinder (27). The tension shaft (4) can move back and forth along the axial direction of the thrust cylinder (27). The displacement sensor includes a displacement sensor body (12) and a displacement sensor core (11). The displacement sensor body (12) is fixed to the side of the thrust cylinder (27). The displacement sensor core (11) is inserted into a groove opened in the displacement sensor body (12) and can slide along the groove. The iron core extension rod (7) has one end inserted into the displacement sensor body (12) and fixedly connected to the displacement sensor iron core (11), and the other end is fixed to the tension shaft (4) through the iron core connecting seat (6); the displacement sensor iron core (11) can move back and forth under the drive of the tension shaft (4); The displacement sensor can measure the displacement of the tension shaft (4) by changing the relative position of the displacement sensor body (12) and the displacement sensor core (11), and export the measurement data; The rear end of the tension shaft (4) is provided with a protruding piston part, and the circumferential outer wall of the piston part is in sealed sliding contact with the inner wall of the thrust cylinder (27). The riveting gun also includes a cylinder body (9), which is disposed outside the thrust cylinder (27). A first oil inlet chamber (91) and a second oil inlet chamber (271) are provided between the cylinder body (9) and the thrust cylinder (27). The first oil inlet chamber (91) and the second oil inlet chamber (271) are respectively connected to the oil pipe (25), and the first oil inlet chamber (91) and the second oil inlet chamber (271) are respectively connected to the front and rear ends of the thrust cylinder (27), which can push the piston part and the tension shaft (4) to move back and forth; it also includes a push The thrust shaft (19) has a raised rear end that extends into the thrust cylinder (27) and is fixedly connected to the front end of the thrust cylinder (27). The raised portion of the thrust shaft (19) is provided with a first oil inlet hole (192). The first oil inlet hole (192) passes through the front and rear sides of the raised portion of the thrust shaft (19). The hydraulic oil in the first oil inlet chamber (91) can enter the gap between the rear end protrusion of the thrust shaft (19) and the piston portion through the first oil inlet hole (192) to push the tension shaft (4) to move backward. A third oil inlet hole (272) is provided on the thrust cylinder (27) corresponding to the second oil inlet chamber (271). The third oil inlet hole (272) connects the inside and outside of the thrust cylinder (27). The hydraulic oil in the second oil inlet chamber (271) can enter the thrust cylinder (27) behind the piston through the third oil inlet hole (272) and push the tension shaft (4) to move forward.

2. The double-acting hydraulic riveting gun for detecting displacement in tapped riveting according to claim 1, characterized in that: The protruding part of the thrust shaft (19) is provided with a guide hole (193), and a limiting pin (3) is inserted in the guide hole (193). The limiting pin (3) can limit the forward movement distance of the tension shaft (4) by abutting, so that the protruding part of the thrust shaft (19) and the piston part are separated to form a first thrust oil chamber (100).

3. A double-acting hydraulic riveting gun suitable for detecting displacement in tapped riveting according to claim 1, characterized in that: The rivet gun also includes a stop, which is fixed to the rear end of the thrust cylinder (27) and can limit the distance the tension shaft (4) moves backward by abutting. The third oil inlet (272) is provided on the side wall of the thrust cylinder (27) on the outer periphery of its location.

4. A double-acting hydraulic riveting gun suitable for detecting displacement in tapped riveting according to claim 1, characterized in that: It also includes a shift valve core, which is inserted into the insertion hole at the rear end of the tension shaft (4). The front end of the shift valve core has a protrusion and the rear end extends out from the insertion hole. A first receiving cavity (41) is opened in the tension shaft (4). A push spring (51) is provided in the first receiving cavity (41) and the push spring (51) abuts against the protrusion.

5. A double-action hydraulic riveting gun suitable for detecting displacement in tapped riveting according to claim 4, characterized in that: The first receiving cavity (41) is connected to the first oil inlet cavity (91) for conveying hydraulic oil.

6. A double-acting hydraulic riveting gun suitable for detecting displacement in tapped riveting according to claim 1, characterized in that: It also includes a stop, which is located at the rear end of the thrust cylinder (27) and can limit the distance by which the tension shaft (4) moves backward by abutting against it, and the front and rear positions of the stop are adjustable; The stop includes: Release piston (30), which is fixed to the rear end of the thrust cylinder (27); A stroke limiting shaft (28) is disposed inside the release piston (30). The circumferential position of the stroke limiting shaft (28) is fixed, and it can move back and forth along the axial direction of the thrust cylinder (27). The stroke adjustment shaft (29) is located inside the release piston (30) and is threadedly connected to the stroke limit shaft (28). By turning the stroke adjustment shaft (29), the stroke limit shaft (28) can be driven to move back and forth.

7. A double-acting hydraulic riveting gun suitable for detecting displacement in tapped riveting according to claim 6, characterized in that: The stroke adjustment shaft (29) is sleeved inside the stroke limiting shaft (28). The rear end of the stroke limiting shaft (28) is provided with a second push oil chamber (200) composed of the outer wall of the stroke adjustment shaft (29) and the inner wall of the release piston (30). The shaft portions of the stroke limiting shaft (28) and the stroke adjustment shaft (29) are provided with slots that connect the two. The rear end side wall of the stroke adjustment shaft (29) is provided with a fifth oil inlet hole (292). The fifth oil inlet hole (292) connects the slot to the second push oil chamber (200).

8. A double-acting hydraulic riveting gun suitable for detecting displacement in tapped riveting according to claim 1, characterized in that: It also includes a return spring (21), which is located inside the thrust cylinder (27), with its two ends abutting against the tension shaft (4) and the bottom end of the thrust cylinder (27) respectively, and can provide thrust for the forward movement of the tension shaft (4).

9. A double-acting hydraulic riveting gun suitable for detecting displacement in tapped riveting according to claim 1, characterized in that: It also includes a guide post (8), one end of which is fixed to the iron core connecting seat (6), and the other end is inserted into the housing of the rivet gun, which is arranged parallel to the displacement sensor and can move back and forth in the housing along the moving direction of the displacement sensor.

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