Gas-liquid driving type piston assembly riveting device

Abstract

The utility model provides a gas-liquid drive type piston assembly riveting device which comprises a base, a pair of fixing bases are symmetrically arranged on the two sides of the upper end face of the base, and a riveting base used for limiting and containing a piston body is arranged between the two fixing bases. The lifting mechanism is provided with a vertically telescopic output end; the pressing plate ascends and descends along with the output end of the lifting mechanism; the pressing seat is arranged on the front side of the bottom of the pressing plate, is vertically opposite to the riveting seat and is used for limiting and pressing the preassembled spring base at the upper end of a piston body of the riveting seat; the riveting devices are symmetrically arranged on the two fixing seats and comprise riveting cutters and double-power driving pieces used for driving the riveting cutters to move in the direction close to or away from the riveting seats, and the connecting line of the two riveting cutters is opposite to the position of a riveting ring groove in the upper portion of the piston body. The production efficiency is greatly improved, the labor intensity is reduced, and the quality and the consistency of products are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of riveting devices, in particular to a gas-liquid driven piston assembly riveting device. Background Art

[0002] The piston assembly 10 is a key component of the automobile brake master cylinder. Figure 1 、 2 As shown, its structure integrates components such as the retaining ring 11, sealing valve 12, fastening bolts 13, spring base 14, piston body 15, and buffer spring 16. These components are connected in the order of retaining ring 11 - sealing valve 12 - fastening bolts 13 - spring base 14, while the buffer spring 16 is cleverly positioned between the spring base 14 and the outer edge of the retaining ring 11. The lower portion 212 of the spring base 14 is designed to match the riveted ring groove 151 preset on the upper portion 211 of the piston body 15, aiming to achieve a stable connection through the subsequent riveting step, forming a unified whole.

[0003] While this design ensures component stability and sealing, existing riveting processes face challenges in implementation. Traditional methods rely on specialized jigs to secure the piston assembly and manually operate riveting tools to complete the connection. This series of operations not only requires high physical effort and increases labor intensity, but also results in low production efficiency, making it difficult to meet the needs of large-scale industrial production. Furthermore, manual riveting is limited in consistency and precision, resulting in significant fluctuations in riveting quality, which impacts the reliability and consistency of the final product.

[0004] In view of this, the inventor specially designed a gas-liquid driven piston assembly riveting device, which resulted in the present case. Utility Model Content

[0005] In order to solve the above problems, the technical solution of the present utility model is as follows:

[0006] A gas-liquid driven piston assembly riveting device, comprising:

[0007] The base has a pair of fixed seats symmetrically arranged on both sides of its upper end surface and a riveted seat for limiting and accommodating the piston body is provided between the two fixed seats;

[0008] A lifting mechanism having a vertically retractable output end;

[0009] A pressing plate that rises and falls with the output end of the lifting mechanism;

[0010] A pressing seat is provided at the front side of the bottom of the pressing plate and is vertically opposite to the riveting seat, and is used to limit and press the pre-installed spring base against the upper end of the piston body of the riveting seat;

[0011] The riveting device is symmetrically arranged on two fixed seats and includes a riveting knife and a dual power driving member for driving the riveting knife to move toward or away from the riveting seat. The connection line of the two riveting knives is opposite to the riveting ring groove on the upper part of the piston body.

[0012] Preferably, the clamping plate is square and a mounting portion is formed by protruding from the middle of its front side. The clamping seat includes a clamping cylinder and a connecting bolt provided at the axial upper end of the clamping cylinder, and the connecting bolt is threadedly connected to the mounting portion.

[0013] Preferably, a pair of vertical linear bearing sleeves are symmetrically arranged on both sides of the clamping plate, and the upper end surface of the base is provided with a pair of bearing guide rods slidingly connected to the two linear bearing sleeves respectively, and the linear bearing sleeves and the bearing guide rods form a guiding mechanism.

[0014] Preferably, the lifting mechanism is a cylinder, and its output end is the end of its telescopic rod, and the end of the telescopic rod is fixed to the bottom of the pressing plate and is located between the two linear bearing sleeves.

[0015] Preferably, the mounting portion is vertically penetrated to form a mounting screw hole that is threadably matched with the connecting bolt, and a hidden groove coaxial with the mounting screw hole is provided on the bottom surface of the mounting portion and located at the position of the mounting screw hole.

[0016] Preferably, the dual-power drive component includes a cylinder body with a cylindrical chamber inside, and the cylinder body passes through the cylindrical chamber along the axial direction to form a first through hole and a second through hole. The riveting knife includes a head section, a sliding section and an adjustment section connected in sequence. The sliding section is arranged in the cylindrical chamber and its front side passes through the first through hole and is connected to the head section. The adjustment section passes through the second through hole and is connected to the sliding section. A limiting portion protruding from the middle of the sliding section is provided to match the clearance of the cylindrical chamber.

[0017] Preferably, the inner wall of the first through hole is provided with a plurality of first annular sealing grooves along its axial direction, the inner wall of the second through hole is provided with a plurality of second annular sealing grooves along its axial direction, and the outer wall of the limiting portion is provided with a plurality of third annular sealing grooves along its axial direction, and the first annular sealing groove, the second annular sealing groove and the third annular sealing groove are all provided with sealing rings.

[0018] Preferably, an air pressure chamber filled with gas is formed in the cylindrical chamber and located on the front side of the limiting portion close to the riveting device, and an oil pressure chamber is formed in the area of ​​the cylindrical chamber located on the other side of the limiting portion. The outer side walls of the cylinder body respectively correspond to the air pressure chamber and the oil pressure chamber to form an air inlet hole and an oil inlet hole connected thereto, and an oil outlet hole connected to the oil pressure chamber is provided at the upper end of the cylindrical chamber.

[0019] Preferably, a guide plate is provided on the front side of the cylinder body close to the riveting knife, which is in clearance fit with the cutter head section, and both sides of the guide plate are fixedly connected to the front side of the cylinder body through a connecting shaft.

[0020] Preferably, the adjustment section includes an adjustment shaft that is slidably engaged with the second through hole and a stroke adjustment nut. The end of the adjustment shaft is provided with an external thread, and the inner side of the stroke adjustment nut is threadedly connected to the end of the adjustment shaft.

[0021] The beneficial effects of the utility model are as follows:

[0022] The piston assembly riveting device provided by this utility model effectively solves the problems existing in traditional riveting processes by adopting a riveting method driven by both gas and liquid, combined with an automated clamping and positioning mechanism, and significantly improves production efficiency and product quality. Specifically, the device accurately positions the piston body through the riveting seat on the base, avoiding errors in manual operation; the arrangement of the clamping plate and the clamping seat can stably press the pre-installed spring base against the piston body, ensuring stability and consistency during the riveting process; the riveting device driven by both gas and liquid can provide sufficient force for efficient riveting, and can achieve precise control through fine adjustment, ensuring riveting quality and product reliability.

[0023] In addition, the device's dual-power drive uses a combination of air pressure and oil pressure to ensure fast response and high efficiency while taking into account stability and precision. It is especially suitable for riveting operations that require precise control.

[0024] In summary, the gas-liquid driven piston assembly riveting device provided by the utility model not only greatly improves production efficiency and reduces labor intensity, but also significantly improves product quality and consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0026] in:

[0027] Figure 1 This is a schematic diagram of the riveting state change of the piston assembly in the prior art;

[0028] Figure 2 It is a schematic cross-sectional view of a piston assembly in the prior art;

[0029] Figure 3 It is a schematic diagram of the overall structure of the utility model;

[0030] Figure 4 It is a front view of the utility model;

[0031] Figure 5 It is a partial cross-sectional structural schematic diagram of the utility model;

[0032] Figure 6 It is a rear view of the utility model;

[0033] Figure 7 yes Figure 5 Schematic diagram of the local enlarged structure of area A in the middle

[0034] Description of labels:

[0035] 10. Piston assembly; 11. Retaining ring; 12. Sealing valve; 13. Fastening bolt; 14. Spring base; 15. Piston body; 151. Riveted ring groove; 16. Buffer spring; 20. Base; 21. Fixed seat; 211. Upper part; 212. Lower part; 22. Riveted seat; 23. Giving groove; 24. Locking hole; 30. Lifting mechanism; 31. Output end; 40. Pressing plate; 41. Mounting part; 42. Mounting screw hole; 43. Hidden groove; 50. Pressing seat; 51. Pressing cylinder; 52. Connecting bolt; 60. Riveting device; 70. Riveting knife; 71. Knife Head section; 72. Sliding section; 73. Adjusting section; 731. Adjusting shaft; 732. Stroke adjusting nut; 74. Limiting section; 75. Third annular sealing groove; 76. Guide plate; 77. Connecting shaft; 80. Dual-power drive member; 81. Cylinder body; 82. Cylindrical chamber; 821. Air pressure chamber; 822. Oil pressure chamber; 823. Air inlet hole; 824. Oil inlet hole; 825. Oil outlet hole; 83. First through hole; 84. Second through hole; 85. First annular sealing groove; 86. Second annular sealing groove; 90. Guide mechanism; 91. Linear bearing sleeve; 92. Bearing guide rod. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] In the prior art, the piston assembly 10 is a key component of the automobile brake master cylinder. Figure 1 、 2 As shown, its structure integrates components such as the retaining ring 11, sealing valve 12, fastening bolts 13, spring base 14, piston body 15, and buffer spring 16. These components are connected in the order of retaining ring 11 - sealing valve 12 - fastening bolts 13 - spring base 14, while the buffer spring 16 is cleverly positioned between the spring base 14 and the outer edge of the retaining ring 11. The lower portion 212 of the spring base 14 is designed to match the riveted ring groove 151 preset on the upper portion 211 of the piston body 15, aiming to achieve a stable connection through the subsequent riveting step, forming a unified whole.

[0038] See also Figures 1 to 7 , is a gas-liquid driven piston assembly riveting device as the best embodiment of the utility model, comprising:

[0039] The base 20 has a pair of fixed seats 21 symmetrically arranged on both sides of its upper end surface, and a riveted seat 22 for limiting and accommodating the piston body 15 is provided between the two fixed seats 21;

[0040] A lifting mechanism 30 having a vertically retractable output end 31;

[0041] The pressing plate 40 is moved up and down with the output end 31 of the lifting mechanism 30 , that is, it is fixed on the output end 31 of the lifting mechanism 30 and moves up and down with it;

[0042] The pressing seat 50 is provided at the front side of the bottom of the pressing plate 40 and vertically opposite to the riveting seat 22, and is used to limit and press the pre-assembled spring base 14 against the upper end of the piston body 15 of the riveting seat 22;

[0043] The riveting device 60 is symmetrically arranged on the two fixing seats 21 and includes a riveting knife 70 and a dual power driving member 80 for driving the riveting knife 70 to move in a direction close to or away from the riveting seat 22. The line connecting the two riveting knives 70 is opposite to the riveting ring groove 151 of the upper portion 211 of the piston body 15.

[0044] Specifically, such as Figure 3 As shown, in this embodiment, an inwardly recessed clearance groove 23 is formed in the middle of the front side of the base 20 and at a position opposite to the rivet seat 22. The side wall of the clearance groove 23 is provided with a locking hole 24 that passes through the bottom of the rivet seat 22. Therefore, through the setting of the locking hole 24 and the clearance groove 23, the piston body 15 can be conveniently pre-tightened and fixed, which is convenient for the subsequent riveting process.

[0045] Preferably, Figure 3 、 5 As shown, the clamping plate 40 is square and a mounting portion 41 is protruded from the middle of its front side. The clamping seat 50 includes a clamping cylinder 51 and a connecting bolt 52 provided at the axial upper end of the clamping cylinder 51. The connecting bolt 52 is threadedly connected to the mounting portion 41. The square clamping plate 40 can provide a larger contact area, thereby dispersing pressure during the clamping process and avoiding local stress concentration, which helps to maintain the stability of the piston assembly 10 during the riveting process and reduce the risk of deformation. In addition, by threading the connecting bolt 52 of the clamping seat 50 to the mounting portion 41 of the clamping plate 40, not only quick assembly is achieved, but also fine-tuning the position of the clamping seat 50 is allowed to ensure that the clamping force is evenly distributed in the predetermined area of ​​the piston assembly 10, thereby improving the riveting accuracy.

[0046] Preferably, Figure 3 、 4As shown, a pair of vertical linear bearing sleeves 91 are symmetrically arranged on both sides of the pressure plate 40, and a pair of bearing guide rods 92 are provided on the upper end surface of the base 20, which are respectively slidably connected to the two linear bearing sleeves 91. The linear bearing sleeves 91 and the bearing guide rods 92 form a guide mechanism 90. Therefore, the combination of the linear bearing sleeves 91 and the bearing guide rods 92 ensures the smooth movement of the pressure plate 40 in the vertical direction, avoiding shaking and deflection during movement. The structure is relatively simple, convenient for daily inspection and maintenance, and it is also relatively easy to replace worn parts, which helps to maintain the good condition of the equipment and reduce unplanned downtime. Therefore, by adopting the guide mechanism 90 composed of linear bearing sleeves 91 and bearing guide rods 92, not only the accuracy and stability of the movement of the pressure plate 40 are improved, but also friction and wear are reduced, the life of the equipment is extended, and maintenance work is simplified. It is an optimal solution that takes into account both performance and economic benefits.

[0047] Preferably, Figure 5 、 6 As shown, the lifting mechanism 30 is a cylinder, and its output end 31 is the end of its telescopic rod, the end of the telescopic rod is fixed to the bottom of the clamping plate 40 and is located between the two linear bearing sleeves 91, the bottom of the cylinder is fixed to the upper end of the base 20, and the end of the telescopic rod at the top is fixed to the bottom of the clamping plate 40 and is located between the two linear bearing sleeves 91, so as to facilitate the guide drive of the clamping plate 40. Through the telescopic movement of the telescopic rod, the clamping seat 50 can be easily pressed on the pre-installed spring base 14, so that it is aligned with the riveted ring groove 151 at the upper end of the piston body 15, which is convenient for the subsequent riveting and fixing process.

[0048] Preferably, Figure 5 As shown, the mounting portion 41 is vertically penetrated to form a mounting screw hole 42 that is threadedly matched with the connecting bolt 52. A hidden groove 43 that is coaxial with the mounting screw hole 42 is provided on the bottom surface of the mounting portion 41 and at the position of the mounting screw hole 42. The hidden groove 43 can hide the nut used to fix the connecting bolt 52, which not only improves the neatness of the appearance of the device, but also plays a certain protective role, preventing it from external collision or corrosion, and extending its service life.

[0049] Preferably, Figure 5 、 7As shown, the dual-power drive member 80 includes a cylinder body 81 with a cylindrical chamber 82 inside, and the cylinder body 81 passes through the cylindrical chamber 82 along the axial direction to form a first through hole 83 and a second through hole 84. The riveting knife 70 includes a head section 71, a sliding section 72 and an adjustment section 73 connected in sequence. The sliding section 72 is arranged in the cylindrical chamber 82 and its front side passes through the first through hole 83 and is connected to the head section. The adjustment section 73 passes through the second through hole 84 and is connected to the sliding section 72. A limiting portion 74 is protruded from the middle of the sliding section 72 and is clearance-matched with the cylindrical chamber 82. Therefore, the first through hole 83 and the second through hole 84 on the cylinder body 81 cooperate with the sliding section 72 and the adjustment section 73 of the riveting knife 70 to ensure stable movement and precise control of the head section 71. The clearance between the stopper 74 in the middle of the sliding section 72 and the cylindrical chamber 82 ensures smooth movement while limiting excessive displacement, enhancing operational reliability and safety. The overall design is compact and efficient, providing stable and controllable power output, meeting the demands of high-precision riveting and significantly improving production efficiency and product quality.

[0050] Preferably, Figure 5 、 7 As shown, the inner wall of the first through hole 83 is provided with a plurality of first annular sealing grooves 85 along its axial direction, the inner wall of the second through hole 84 is provided with a plurality of second annular sealing grooves 86 along its axial direction, and the outer wall of the limiting portion 74 is provided with a plurality of third annular sealing grooves 75 along its axial direction. The first annular sealing groove 85, the second annular sealing groove 86 and the third annular sealing groove 75 are all provided with sealing rings (not shown in the figure). In this embodiment, there are two first annular sealing grooves 85 and two second annular sealing grooves 86, and there are three third annular sealing grooves 75. Therefore, the synergistic effect of the first annular sealing groove 85, the second annular sealing groove 86 and the third annular sealing groove 75 effectively isolates the internal and external environments, prevents leakage of the working medium, and ensures the stable operation and high efficiency of the drive system. In addition, the multi-layer sealing design also improves the durability of the device, reduces maintenance requirements, and ensures the reliability and accuracy of long-term operation.

[0051] Preferably, Figure 6 、 7As shown, a gas-filled air pressure chamber 821 is formed within the cylindrical chamber 82 and located on the front side of the limiting portion 74 near the riveting device 60. The area of ​​the cylindrical chamber 82 located on the other side of the limiting portion 74 forms an oil pressure chamber 822. The outer wall of the cylinder body 81 forms an air inlet hole 823 and an oil inlet hole 824 corresponding to the air pressure chamber 821 and the oil pressure chamber 822, respectively. The upper end of the cylindrical chamber 82 is provided with an oil outlet hole 825 connected to the oil pressure chamber 822. By cleverly partitioning the cylindrical chamber 82 to form the air pressure chamber 821 and the oil pressure chamber 822, efficient conversion and utilization of gas-liquid dual power is achieved. The air inlet hole 823 ensures the precise input of compressed air and stimulates a rapid response; while the oil inlet hole 824 and the oil outlet hole 825 ensure the circulation of hydraulic oil and maintain stable thrust. This layout not only improves the smoothness and control accuracy of power transmission, but also effectively isolates the two working media, avoids contamination, and ensures the long-term stable operation and high performance of the drive system.

[0052] Preferably, Figure 3 、 7 As shown, a guide plate 76 is provided on the front side of the cylinder 81 near the riveting knife 70, which is in clearance with the cutter head section 71. The two sides of the guide plate 76 are fixedly connected to the front side of the cylinder 81 through connecting shafts 77. The setting of the guide plate 76 significantly improves the straightness and stability of the riveting knife 70. Through the precise clearance fit with the cutter head section 71, the guide plate 76 effectively guides the forward path of the riveting knife 70, ensuring accurate alignment during the riveting process, greatly improving the riveting quality and efficiency. At the same time, the stable connection between the guide plate 76 and the cylinder 81 enhances the rigidity of the overall structure, reduces vibration during operation, and further ensures processing accuracy.

[0053] Preferably, Figure 6 、 7 As shown, the adjustment section 73 includes an adjustment shaft 731 that slides with the second through hole 84 and a stroke adjustment nut 732. The end of the adjustment shaft 731 is provided with an external thread, and the inner side of the stroke adjustment nut 732 is threadedly connected to the end of the adjustment shaft 731. Through the cooperation between the adjustment shaft 731 and the stroke adjustment nut 732, the user is allowed to accurately control the stroke of the riveting knife 70 by rotating the stroke adjustment nut 732 according to specific needs, thereby ensuring processing accuracy and consistency in different application scenarios.

[0054] In particular, such as Figure 3As shown, in this embodiment, the fixing base 21 includes a lower portion 212 that is locked and fixed to the base 20 and an upper portion 211 located at the upper end of the lower portion 212. The upper portion 211 is detachably fixed to the lower portion 212 by a locking bolt, and the cylinder body 81 is embedded in the installation groove formed between the upper portion 211 and the lower portion 212. Designing the fixing base 21 as a split lower portion 212 and upper portion 211 not only facilitates a stable connection with the base 20, but also cleverly embeds the cylinder body 81 in the installation groove formed by the two, achieving a compact structure. This layout not only saves space and enhances the overall stability, but also facilitates the installation and maintenance of the cylinder body 81, improving the modularity and field adaptability of the device.

[0055] In this embodiment, the air inlet 823 is connected to an external gas pressure source, and the oil inlet 824 and the oil outlet 825 are connected to an external pressure oil source.

[0056] The working process and beneficial effects of the utility model are as follows:

[0057] First, the piston assembly to be riveted is placed on the riveted seat 22, which then performs preliminary positioning of the piston body 15. Simultaneously, the pressure plate 40 is in a high position, ensuring that the piston assembly 10 can be placed in place without obstruction. Subsequently, the retaining ring 11, sealing valve 12, fastening bolt 13, and spring base 14 are connected in this order, with the buffer spring 16 cleverly positioned between the spring base 14 and the outer edge of the retaining ring 11. The lower portion 212 of the spring base 14 is positioned above the riveted ring groove 151 at the upper end of the piston body 15. The lifting mechanism 30 (e.g., a cylinder) is activated, causing the pressure plate 40 to descend along the guide mechanism 90 until the pressure seat 50 contacts the top of the pre-assembled spring base 14. The pressing cylinder 51 of the pressing seat 50 firmly presses the pre-installed spring base 14 against the piston body 15, ensuring that it will not move during the subsequent riveting process. The dual-power drive 80 begins to operate, and pressurized oil enters the oil pressure chamber 822 through the oil inlet hole 824, pushing the sliding section 72 forward, driving the blade section 71 of the riveting knife 70 close to the riveting ring groove 151 of the piston body 15. At this time, the air pressure chamber 821 is not yet pressurized and relies solely on oil pressure for preliminary positioning. When the blade section 71 reaches the predetermined position, the oil pressure chamber 822 continues to supply oil, generating greater thrust, overcoming the friction between the limiter 74 and the cylindrical chamber 82, and further propelling the sliding section 72 forward, completing the riveting operation. During this process, the guide plate 76 ensures the linear movement of the cutter head section 71, and the stroke adjustment nut 732 controls the depth of riveting. After the riveting is completed, the oil pressure is released, the air pressure chamber 821 is filled with air, and the sliding section 72 returns to its initial position under the action of the air pressure restoring force. The clamping plate 40 rises and releases the pressure on the piston assembly 10. At this time, the piston assembly has completed riveting and can be taken out to prepare for the processing of the next workpiece.

[0058] The piston assembly riveting device 60 provided by the present invention effectively solves the problems existing in traditional riveting processes by adopting a riveting method driven by both gas and liquid, combined with an automated clamping and positioning mechanism, and significantly improves production efficiency and product quality. Specifically, the device accurately positions the piston body 15 through the riveting seat 22 on the base 20, avoiding errors in manual operation; the arrangement of the clamping plate 40 and the clamping seat 50 can stably press the pre-installed spring base 14 onto the piston body 15, ensuring stability and consistency during the riveting process; the riveting device 60 driven by both gas and liquid can provide sufficient force for efficient riveting and achieve precise control through fine adjustment, ensuring riveting quality and product reliability.

[0059] In addition, the dual-power drive element 80 of the device uses a combination of air pressure and oil pressure to ensure fast response and high efficiency while taking into account stability and precision, and is particularly suitable for riveting operations that require precise control.

[0060] In summary, the gas-liquid driven piston assembly riveting device provided by the utility model not only greatly improves production efficiency and reduces labor intensity, but also significantly improves product quality and consistency.

[0061] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A gas-liquid driven piston assembly riveting device, characterized in that: include: A base (20) having a pair of fixed seats (21) symmetrically arranged on both sides of its upper end surface and a riveted seat (22) for limiting the position of the piston body (15) arranged between the two fixed seats (21); A lifting mechanism (30) having a vertically telescopic output end (31); A pressing plate (40) is lifted and lowered together with the output end (31) of the lifting mechanism (30); A pressing seat (50) is arranged at the front side of the bottom of the pressing plate (40) and vertically opposite to the riveting seat (22), and is used to limit and press the pre-installed spring base (14) to the upper end of the piston body (15) of the riveting seat (22); The riveting device (60) is symmetrically arranged on two fixed seats (21), and comprises a riveting knife (70) and a dual power driving member (80) for driving the riveting knife (70) to move in a direction approaching or moving away from the riveting seat (22), wherein the connecting line of the two riveting knives (70) is opposite to the riveting ring groove (151) of the upper part (211) of the piston body (15).

2. The gas-liquid driven piston assembly riveting device according to claim 1, characterized in that: The clamping plate (40) is square and has a mounting portion (41) protruding from the middle of its front side. The clamping seat (50) comprises a clamping cylinder (51) and a connecting bolt (52) arranged at the axial upper end of the clamping cylinder (51). The connecting bolt (52) is threadedly connected to the mounting portion (41).

3. The gas-liquid driven piston assembly riveting device according to claim 2, characterized in that: A pair of vertical linear bearing sleeves (91) are symmetrically arranged on both sides of the clamping plate (40), and a pair of bearing guide rods (92) are respectively slidably connected to the two linear bearing sleeves (91) on the upper end surface of the base (20), and the linear bearing sleeves (91) and the bearing guide rods (92) form a guide mechanism (90).

4. The gas-liquid driven piston assembly riveting device according to claim 3, characterized in that: The lifting mechanism (30) is a cylinder, and its output end (31) is the end of its telescopic rod. The end of the telescopic rod is fixed to the bottom of the clamping plate (40) and is located between two linear bearing sleeves (91).

5. The gas-liquid driven piston assembly riveting device according to claim 2, characterized in that: The mounting portion (41) is vertically penetrated to form a mounting screw hole (42) threadedly matched with the connecting bolt (52), and a hidden groove (43) coaxial with the mounting screw hole (42) is provided on the bottom surface of the mounting portion (41) and located at the position of the mounting screw hole (42).

6. The gas-liquid driven piston assembly riveting device according to claim 1, characterized in that: The dual-power drive member (80) includes a cylinder body (81) having a cylindrical chamber (82) therein, wherein the cylinder body (81) penetrates the cylindrical chamber (82) along the axial direction to form a first through hole (83) and a second through hole (84), and the riveting knife (70) includes a knife head section (71), a sliding section (72) and an adjustment section (73) which are connected in sequence, wherein the sliding section (72) is arranged in the cylindrical chamber (82) and its front side passes through the first through hole (83) and is connected to the head section, and the adjustment section (73) passes through the second through hole (84) and is connected to the sliding section (72), and a limiting portion (74) protruding from the middle of the sliding section (72) is provided which is clearance-matched with the cylindrical chamber (82).

7. The gas-liquid driven piston assembly riveting device according to claim 6, characterized in that: The inner wall of the first through hole (83) is provided with a plurality of first annular sealing grooves (85) along its axial direction, the inner wall of the second through hole (84) is provided with a plurality of second annular sealing grooves (86) along its axial direction, and the outer wall of the limiting portion (74) is provided with a plurality of third annular sealing grooves (75) along its axial direction. The first annular sealing groove (85), the second annular sealing groove (86) and the third annular sealing groove (75) are all provided with sealing rings.

8. The gas-liquid driven piston assembly riveting device according to claim 6, characterized in that: An air pressure chamber (821) filled with gas is formed inside the cylindrical chamber (82) and located on the front side of the limiting portion (74) close to the riveting device (60); an oil pressure chamber (822) is formed in the area of ​​the cylindrical chamber (82) located on the other side of the limiting portion (74); an air inlet (823) and an oil inlet (824) communicating with the air pressure chamber (821) and the oil pressure chamber (822) are formed on the outer side wall of the cylinder body (81) respectively corresponding to the air pressure chamber (821) and the oil pressure chamber (822); an oil outlet (825) communicating with the oil pressure chamber (822) is provided at the upper end of the cylindrical chamber (82).

9. The gas-liquid driven piston assembly riveting device according to claim 6, characterized in that: A guide plate (76) is provided on the front side of the cylinder body (81) close to the riveting knife (70) and is clearance-matched with the knife head section (71). Both sides of the guide plate (76) are fixedly connected to the front side of the cylinder body (81) via a connecting shaft (77).

10. The gas-liquid driven piston assembly riveting device according to claim 6, characterized in that: The adjustment section (73) comprises an adjustment shaft (731) that is slidably matched with the second through hole (84) and a stroke adjustment nut (732); an end of the adjustment shaft (731) is provided with an external thread, and the inner side of the stroke adjustment nut (732) is threadedly connected to the end of the adjustment shaft (731).

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