A consumable-free riveting machine

Abstract

This application relates to a consumable-free riveting machine, belonging to the field of riveting equipment, including a riveting assembly for riveting multiple workpieces together; a pneumatic-hydraulic transmission assembly connected to a gas source to convert pneumatic energy into hydraulic energy to drive the riveting assembly to work; and a trigger assembly for controlling the energy conversion of the pneumatic-hydraulic transmission assembly and the start and stop of the riveting assembly. This application reduces the cost of the drive device of the consumable-free riveting machine while ensuring the pressure.

Description

Technical Field

[0001] The present application relates to the field of riveting equipment, and particularly to a consumable-free riveting machine. Background Art

[0002] Riveting is a connection method that rivets two workpieces together by deforming the workpieces or rivets. This processing technology is commonly known as press riveting and is mostly used for the connection processing between two plates. Common press riveting methods include rivet riveting and non-rivet riveting. Non-rivet riveting is also called consumable-free riveting. During consumable-free riveting, the press riveting machine extrudes the relative positions of the two workpieces, and the two workpieces are locally deformed and connected together.

[0003] In the above process, the driving of the press riveting machine is mostly electric drive, hydraulic drive or pneumatic drive. The drive provides pressure for the riveting execution part of the press riveting machine, and the riveting execution part concentrates the pressure to rivet the workpieces.

[0004] In view of the above related technologies, in order to provide sufficient pressure, electric drive and pneumatic drive require drive devices with large power and volume, while the hydraulic station required by hydraulic drive, which is easy to provide large pressure, has a high cost. Therefore, whether it is a high-power and large-volume electric or pneumatic drive device or a hydraulic station, it requires a high equipment cost. For this reason, a consumable-free riveting machine with a low-cost drive device is needed. Summary of the Invention

[0005] In order to reduce the cost of the drive device of the consumable-free riveting machine while ensuring the pressure, the present application provides a consumable-free riveting machine.

[0006] The consumable-free riveting machine provided by the present application adopts the following technical solutions:

[0007] A consumable-free riveting machine includes a riveting assembly for riveting a plurality of workpieces together; a pneumatic-hydraulic transmission assembly connected to a gas source, which converts pneumatic energy into hydraulic energy to drive the riveting assembly to work; and a trigger assembly for controlling the energy conversion of the pneumatic-hydraulic transmission assembly and the start and stop of the riveting assembly.

[0008] By adopting the above solution, after stacking a plurality of workpieces to be riveted together, the worker places them at the position of the riveting assembly, starts the trigger assembly, the trigger assembly turns on the pneumatic-hydraulic transmission assembly, the pneumatic-hydraulic transmission assembly converts pneumatic energy into hydraulic energy and drives the riveting assembly to work, and the plurality of workpieces are riveted together by the riveting assembly driven by the pneumatic-hydraulic transmission assembly. The pneumatic-hydraulic transmission assembly converts the pressure gas with low equipment cost and power cost into hydraulic pressure that is easy to provide high pressure, reducing the cost of the drive device of the consumable-free riveting machine while ensuring the pressure.

[0009] Preferably, the riveting assembly includes: a gun body provided with a riveting groove for placing workpieces to be riveted; a slider disposed on one side of the riveting groove and sliding along the length direction of the gun body under the drive of a pneumatic-hydraulic transmission assembly; a riveting claw mounted on the slider and stamping a plurality of workpieces when moving towards the riveting groove, and a bending portion is formed at the corresponding stamping position of the workpiece, and the bending portion is located on the side of the workpiece away from the slider; a riveting block disposed on the gun body corresponding to the riveting groove and the side of the workpiece away from the slider, and the riveting block moves towards the slider and presses the bending portion of the workpiece.

[0010] By adopting the above scheme, a plurality of workpieces to be riveted are placed in the riveting groove. The slider drives the riveting claw to move towards the workpiece under the drive of the pneumatic-hydraulic transmission assembly. The riveting claw stamps and breaks the contact portion between the workpiece itself and the workpiece, and a bending portion is formed at the position where the workpiece is broken and deformed. The riveting block moves towards the bending portion of the workpiece and presses the bending portion. The bending portions at the same position of a plurality of workpieces are folded together after being pressed, and the folded bending portions rivet a plurality of workpieces together. The non-consumable riveting machine uses the bending portion of the workpiece itself that is stamped and deformed to rivet a plurality of workpieces together, reducing the consumption of consumables such as rivets in the riveting process and reducing the processing cost of the workpiece for the enterprise.

[0011] Preferably, there are two riveting claws. At the end of the two riveting claws close to the riveting groove, a stamping inclined surface is provided. The stamping inclined surface makes the connection portion between the bent portion punched out of the workpiece and the workpiece located on the side where the two riveting claws are close to each other; at the position of the two riveting claws close to the stamping inclined surface, arc-shaped first guiding surfaces are provided. The two first guiding surfaces are disposed on the side where the two riveting claws are close to each other, and the two first guiding surfaces make the two bending portions bend towards each other; on the side of the riveting block close to the riveting groove, an arc-shaped second guiding surface is provided, and the arc opening of the second guiding surface faces the riveting groove.

[0012] By adopting the above scheme, the riveting claw uses the inclined stamping inclined surface to break through the workpiece and form a bending portion. The arc-shaped first guiding surface makes the bending portion bend towards each other. The second guiding surface of the riveting block further presses the bending portion. The bending portions are closely folded and pressed together under the sequential action of the first guiding surface and the second guiding surface. The workpieces stacked together are riveted together under the action of the folded and pressed bending portions.

[0013] Preferably, the slider is provided with mounting grooves for mounting two riveting claws. At the position of the two riveting claws away from the riveting groove, abutting portions are provided. The abutting portions are disposed on the side where the two riveting claws are close to each other; wave bead screws are provided on the side of the slider corresponding to the two riveting claws away from each other, and the two wave bead screws respectively abut against the side of the two riveting claws away from each other; the riveting claws are mounted in the mounting grooves, and there is a gap between the riveting claws and the side wall of the mounting groove. The abutting portion of the riveting claw abuts against the side wall of the mounting groove away from the riveting groove. A resilient buffer block is provided at the position between the two abutting portions of the mounting groove, and the buffer block is used to buffer the force of the two abutting portions approaching each other.

[0014] By adopting the above solution, during the process of the riveting claws stamping a bent portion on the workpiece, the reaction forces of the workpiece on the stamping inclined surface and the first guiding surface cause the two riveting claws to be subjected to forces moving away from each other. The two riveting claws swing and deform in the direction away from each other under the buffering of the ball screw. Due to the lever principle, the abutting portions of the two riveting claws move towards each other. The buffer block uses its own deformation to buffer the force of the two abutting portions approaching each other. The ball screw and the buffer block cooperate with each other to provide support and buffering for the riveting claws while giving the riveting claws appropriate swinging space, reducing the probability of plastic deformation of the riveting claws under the reaction force of the workpiece.

[0015] Preferably, the triggering assembly includes: a grip, the grip is provided with an air inlet passage, a return air passage and an oil inlet passage, and the air inlet passage is connected to an air source; a triggering piston, slidably connected to the position of the grip corresponding to the air inlet passage and the return air passage, the triggering piston is provided with a triggering groove, and as the triggering piston slides, the triggering groove can communicate or disconnect the air inlet passage and the return air passage; when the triggering groove communicates the air inlet passage and the return air passage, the air-liquid transmission assembly converts the air pressure of the air source into oil pressure and increases the pressure, and the pressurized hydraulic oil drives the riveting assembly through the oil inlet passage; when the air inlet passage and the return air passage are disconnected, the air-liquid transmission assembly releases the drive of the riveting assembly, and the hydraulic oil flows to the air-liquid transmission assembly through the oil inlet passage.

[0016] By adopting the above solution, the operator pinches the grip and controls the sliding position of the triggering piston according to the riveting requirement. When the triggering groove communicates the air inlet passage and the return air passage, the air-liquid transmission assembly converts the air pressure of the air source into oil pressure and increases the pressure, and the pressurized hydraulic oil drives the riveting assembly through the oil inlet passage; when the air inlet passage and the return air passage are disconnected, the air-liquid transmission assembly releases the drive of the riveting assembly, and the hydraulic oil flows to the air-liquid transmission assembly through the oil inlet passage.

[0017] Preferably, the air-liquid transmission assembly includes: a first cylinder body, a pneumatic piston is slidably connected in the first cylinder body, and the air pressure of the air source drives the pneumatic piston to move; a second cylinder body, a pressure oil rod is slidably connected in the second cylinder body, hydraulic oil is filled in the second cylinder body, the second cylinder body is communicated with the oil inlet passage, the pressure oil rod is connected to the pneumatic piston, and the cross-sectional area of the pressure oil rod is smaller than that of the pneumatic piston. When the air source pressurizes the first cylinder body, the pneumatic piston drives the pressure oil rod to pressurize the hydraulic oil, and the pressurized hydraulic oil drives the riveting assembly through the oil inlet passage.

[0018] By adopting the above solution, when the trigger groove connects the air inlet passage and the air return passage, the pressurized gas from the air source enters the first cylinder block. The pressurized gas pushes the pneumatic piston to move towards the second cylinder block, and the pneumatic piston pushes the oil pressing rod to pressurize the hydraulic oil in the second cylinder block. Since the cross-sectional area of the oil pressing rod is smaller than that of the pneumatic piston, the oil pressing rod can generate a higher pressure on the hydraulic oil. Through the pressure conversion of the pneumatic piston and the oil pressing rod, the hydraulic oil obtains a pressure greater than that of the pressurized gas. The air source that generates the pressurized gas can be equipment such as an air compressor and a pressure gas cylinder, which are relatively cheaper than a hydraulic station in terms of price. While ensuring the pressure, the cost of the driving device of the non-consumable riveting machine is reduced.

[0019] Preferably, the driving assembly includes: a piston rod, slidably connected to the gun body, the cross-sectional area of the piston rod being larger than that of the riveting claw and smaller than that of the oil pressing rod. The piston rod is driven by the hydraulic oil of the air-liquid transmission assembly. When the hydraulic oil is pressurized, the piston rod drives the slider to move towards the riveting groove; a first return spring, applying a force to the piston rod in the direction away from the riveting groove. After the hydraulic oil is depressurized, the first return spring pushes the piston rod and the slider away from the riveting groove.

[0020] By adopting the above solution, the hydraulic oil pressurized by the air-liquid transmission assembly pushes the piston rod and the riveting claw towards the workpiece. The design that the cross-sectional area of the piston rod is larger than that of the riveting claw and smaller than that of the oil pressing rod facilitates the further concentration of the pressure received by the piston rod by the riveting claw, that is, further increases the pressure generated on the workpiece, increases the magnification of the pressure generated on the pressurized gas of the air source, and improves the riveting effect. The pressure generated by the air source is gradually amplified from the pneumatic piston to the oil pressing rod, from the oil pressing rod to the piston rod, and from the piston rod to the riveting claw, and is driven and amplified by the air source with a lower cost and a lower pressure and converted into hydraulic drive. While ensuring the pressure, the cost of the driving device of the non-consumable riveting machine is reduced.

[0021] Preferably, the slide valve assembly includes:

[0022] a valve body, in which a valve hole is provided. A slide rod is slidably connected to the valve body at a position corresponding to the valve hole. The two ends of the slide rod are respectively connected with a first valve core and a second valve core. Both the first valve core and the second valve core are slidably sealed with the valve hole. The diameter of the slide rod is smaller than that of the valve hole;

[0023] The valve body is provided with a first air inlet port, a second air inlet port, a first air outlet port and a second air outlet port that communicate with the valve hole. The first air inlet port can communicate with the first air outlet port through the valve hole. The first air inlet port is connected to the air source. The first air outlet port is connected to the first cylinder block. The first air outlet port can also communicate with the second air outlet port through the valve hole. The second air outlet port communicates with the atmosphere. The second air inlet port communicates with the air return passage of the trigger assembly;

[0024] The second air outlet port is arranged at one end of the valve body corresponding to the valve hole. The valve body is provided with a fourth return spring, and the fourth return spring applies a force to the sliding rod away from the second air outlet port. The first valve core is located at one end of the sliding rod close to the second air outlet port, and the second valve core is located at one end of the sliding rod away from the second air outlet port.

[0025] By adopting the above scheme, when the air inlet channel and the air return channel of the trigger assembly are disconnected, the fourth return spring moves the sliding rod to a position away from the second air outlet port. The first air inlet port is located between the first valve core and the second valve core, and the first valve core isolates the first air inlet port and the first air outlet port. The first air outlet port is communicated with the second air outlet port.

[0026] When the air inlet channel and the air return channel of the trigger assembly are communicated, the pressurized gas enters from the second air inlet port to the side of the second valve core away from the first valve core corresponding to the valve hole. The pressurized gas pushes the sliding rod to move towards the second air outlet port against the fourth return spring. The first air inlet port and the first air outlet port are located between the first valve core and the second valve core. The first air inlet port is communicated with the first air outlet port, and the first valve core isolates the first air outlet port and the second air outlet port.

[0027] Preferably, a movable hanging rack is provided. The movable hanging rack includes: a rack body for installing the air-liquid transmission assembly and the riveting assembly; a base provided with a plurality of universal wheels, and the rack body is installed on the base.

[0028] By adopting the above scheme, the movable hanging rack with universal wheels facilitates the flexible movement and handling of the non-consumable riveting machine.

[0029] In summary, the present application has the following beneficial effects:

[0030] 1. The air-liquid transmission assembly converts the pressurized gas with lower equipment cost and power cost into hydraulic pressure that is easy to provide high pressure, reducing the cost of the driving device of the non-consumable riveting machine while ensuring the pressure.

[0031] 2. The non-consumable riveting machine uses the bent part of the workpiece itself that is stamped and deformed to rivet multiple workpieces together, reducing the consumption of consumables such as rivets in the riveting process and reducing the processing cost of the workpiece for the enterprise.

[0032] 3. The pressure generated by the air source is gradually amplified through the pneumatic piston to the oil pressing rod, from the oil pressing rod to the piston rod, and from the piston rod to the riveting claw. It is driven and amplified by the air source with lower cost and lower pressure and converted into hydraulic drive, reducing the cost of the driving device of the non-consumable riveting machine while ensuring the pressure. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of a non-consumable riveting machine according to an embodiment of the present application;

[0034] Figure 2It is a schematic structural diagram of a prominent riveting gun of a consumable - free riveting machine according to an embodiment of the present application;

[0035] Figure 3 It is a cross - sectional view of a prominent riveting gun of a consumable - free riveting machine according to an embodiment of the present application;

[0036] Figure 4 It is a schematic structural diagram of a prominent riveting claw of a consumable - free riveting machine according to an embodiment of the present application;

[0037] Figure 5 It is a schematic structural diagram of a prominent riveting block of a consumable - free riveting machine according to an embodiment of the present application;

[0038] Figure 6 It is a schematic structural diagram of a prominent trigger assembly of a consumable - free riveting machine according to an embodiment of the present application;

[0039] Figure 7 It is a schematic structural diagram of a prominent oil - inlet channel of a consumable - free riveting machine according to an embodiment of the present application;

[0040] Figure 8 It is a schematic structural diagram of a prominent riveting main body of a consumable - free riveting machine according to an embodiment of the present application;

[0041] Figure 9 It is a schematic structural diagram of a prominent oil storage cylinder of a consumable - free riveting machine according to an embodiment of the present application;

[0042] Figure 10 It is a schematic structural diagram of a prominent slide valve assembly of a consumable - free riveting machine according to an embodiment of the present application;

[0043] Figure 11 It is a cross - sectional view of a prominent riveting main body of a consumable - free riveting machine according to an embodiment of the present application;

[0044] Figure 12 It is a cross - sectional view of a prominent main - path air - inlet port of a consumable - free riveting machine according to an embodiment of the present application.

[0045] Explanation of reference numerals:

[0046] 1. Riveting gun; 11. Gun body; 12. Grip; 2. Driving assembly; 21. Piston chamber; 22. Piston rod; 23. Bump; 24. First return spring; 25. Backing plate; 3. Riveting assembly; 31. First cover; 311. Ball screw; 32. Second cover; 321. Guide groove; 33. Third cover; 331. Relief hole; 34. Riveting groove; 35. Slide block; 351. Installation groove; 352. Buffer block; 36. Riveting claw; 361. Stamping inclined plane; 362. First guiding surface; 363. Contact portion; 37. Riveting block; 371. Second guiding surface; 372. Guide groove; 38. Top block; 381. Second return spring; 4. Trigger assembly; 41. Air inlet passage; 42. Air inlet pipe; 43. Air return passage; 44. Air return pipe; 45. Oil inlet passage; 46. Oil inlet pipe; 47. Press handle; 48. Trigger hole; 481. Trigger piston; 482. Trigger groove; 483. Seal; 484. Third return spring; 5. Riveting main body; 6. Upper end cover; 61. Main air inlet port; 62. Main air outlet port; 63. Driving port; 64. Trigger end air supply port; 65. Trigger end air return port; 7. Slide valve assembly; 71. Valve body; 711. Valve hole; 712. Slide bar; 713. First valve core; 714. Second valve core; 72. Fourth return spring; 73. First air inlet port; 74. Second air inlet port; 75. First air outlet port; 76. Second air outlet port; 77. Top cover; 78. First filter element; 8. Pneumatic-hydraulic transmission assembly; 81. First cylinder block; 82. Air chamber; 83. Pneumatic piston; 84. Fifth return spring; 85. Lower end cover; 851. Pressure relief hole; 852. Second filter element; 86. Second cylinder block; 861. Oil chamber; 862. Oil pressing rod; 87. Oil storage cylinder; 9. Mobile hanging rack; 91. Frame body; 92. Handle; 93. Placing box; 94. Base; 95. Universal wheel; 96. Air source triple unit; 97. Main air transmission pipe; 98. Branch air transmission pipe; 99. Blowing gun. Detailed implementation mode

[0047] The following is a further detailed description of this application in conjunction with the attached Figures 1-12 drawings.

[0048] In this application, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0050] An embodiment of this application discloses a consumable-free riveting machine. Refer to Figure 1 and Figure 2 , a consumable-free riveting machine includes a mobile hanging rack 9, a riveting gun 1, and a riveting main body 5.

[0051] Refer to Figure 1 and Figure 2 , the riveting gun 1 is used to rivet a plurality of workpieces together. The riveting main body 5 converts pneumatic energy into hydraulic energy to drive the riveting gun 1. The riveting gun 1 and the riveting main body 5 are connected to the mobile hanging rack 9, and the mobile hanging rack 9 facilitates the movement of the riveting gun 1 and the riveting main body 5.

[0052] Refer to Figure 1 and Figure 2 , the mobile hanging rack 9 includes a base 94. A plurality of universal wheels 95 are installed on the side of the base 94 close to the ground. A vertically arranged frame body 91 is bolted to the side of the base 94 away from the universal wheels 95. The riveting main body 5 is hung on the frame body 91 at a position away from the base 94 through a chain. A handle 92 and a placement box 93 are also bolted to the frame body 91. The handle 92 facilitates the user to pull the frame body 91, and the riveting gun 1 can be placed in the placement box 93.

[0053] Refer to Figure 1 and Figure 2 , an air source triple unit 96 is fixedly connected to the frame body 91. The air inlet of the air source triple unit 96 is connected to a pressure air source, and the pressure air source can be an air compressor. The air outlet of the air source triple unit 96 is communicated with a main pipeline 97. The main pipeline 97 is connected to the riveting main body 5. The main pipeline 97 is also communicated with a branch pipeline 98, and the branch pipeline 98 is communicated with a blowing gun 99. The air source triple unit 96 purifies, filters, and reduces the pressure of the gas to the rated air source pressure supplied by the instrument. The blowing gun 99 facilitates the worker to clean the dust and debris before and after processing the workpiece.

[0054] Refer to Figure 2 and Figure 3, the riveting gun 1 includes a gun body 11 and a grip 12. The grip 12 is fixedly connected to one side of the gun body 11 in the length direction. The gun body 11 is provided with a riveting assembly 3 for riveting multiple workpieces together and a driving assembly 2 for directly driving the riveting assembly 3. The driving assembly 2 is driven by a riveting main machine 5. The grip 12 is provided with a trigger assembly 4, and the trigger assembly 4 controls the conversion of air pressure and hydraulic pressure by the riveting main machine 5 and the start and stop of the driving assembly 2.

[0055] Referring to Figure 2 and Figure 3 , the riveting assembly 3 includes a first cover 31, a second cover 32, and a third cover 33 arranged in sequence along the length direction of the gun body 11. The third cover 33 is located at one end of the gun body 11. The first cover 31, the second cover 32, and the third cover 33 are all bolted to the gun body 11. There is a gap between the first cover 31 and the second cover. A riveting groove 34 is formed between the first cover 31 and the second cover 32. The riveting groove 34 is perpendicular to the length direction of the gun body 11, and the workpiece can be inserted into the riveting groove 34.

[0056] Referring to Figure 3 and Figure 4 , a slider 35 is slidably connected between the first cover 31 and the gun body 11. The slider 35 slides along the length of the gun body 11. The slider 35 is arranged on the side of the riveting groove 34 away from the third cover 33. The slider 35 moves towards or away from the riveting groove 34 under the drive of the driving assembly 2. The slider 35 is connected with two riveting claws 36. The length direction of the riveting claws 36 is parallel to the length direction of the gun body 11. The distances from the ends of the two riveting claws 36 close to the riveting groove 34 to the second cover 32 are equal. When the riveting claws 36 move towards the riveting groove 34 along with the slider 35, they press multiple workpieces, and bending parts are formed at the corresponding pressed positions of the workpieces. The bending parts are located on the side of the workpieces away from the slider 35.

[0057] Referring to Figure 2 and Figure 3 , a guiding groove 321 is formed at the position of the second cover 32 corresponding to the riveting claws 36. The guiding groove 321 is arranged along the length direction of the riveting claws 36. The riveting claws 36 can slide in the guiding groove 321 along their own length directions. The guiding groove 321 improves the stability of the sliding process of the riveting claws 36 and reduces the probability of the riveting claws 36 being bent and deformed under the reaction force of the workpieces. A relief hole 331 is formed at the position of the third cover 33 corresponding to the guiding groove 321. The relief hole 331 is along the length direction of the guiding groove 321, and the relief hole 331 communicates with the guiding groove 321. The relief hole 331 reduces the probability of the riveting claws 36 colliding with the third cover 33 and also facilitates the discharge of debris generated during the riveting process from the gun body 11.

[0058] Referring to Figure 3 and Figure 4, a riveting block 37 is rotatably connected near the riveting groove 34 of the third cover 33. The rotation center of the riveting block 37 is close to the middle of the riveting block 37, and the rotation plane of the riveting block 37 is parallel to the length direction of the gun body 11. One end of the riveting block 37 rotates towards the first cover 31 under the drive of the drive assembly 2. The riveting block 37 presses the bent part of the workpiece, and the riveting block 37 folds the bent parts of multiple workpieces together. The riveting claws 36 punch and break the contact position between the workpiece itself and the workpiece, and a bent part is formed at the position where the workpiece is broken and deformed. The riveting block 37 moves towards the bent part of the workpiece and presses the bent part. The bent parts at the same position of multiple workpieces are folded together after being pressed, and the folded bent parts rivet multiple workpieces together. The non-consumable riveting machine uses the bent parts of the workpiece itself that are stamped and deformed to rivet multiple workpieces together, reducing the consumption of consumables such as rivets in the riveting process and reducing the processing cost of the workpiece for the enterprise.

[0059] Refer to Figure 3 and Figure 4 , a stamping inclined surface 361 is provided at one end of each of the two riveting claws 36 close to the riveting groove 34. The two stamping inclined surfaces 361 incline towards the slider 35 from the direction where the two riveting claws 36 are away from each other to the direction where the two riveting claws 36 are close to each other. The stamping inclined surface 361 makes the connection position between the bent part punched out of the workpiece and the workpiece located on the side where the two riveting claws 36 are close to each other. An arc-shaped first guiding surface 362 is provided at each of the two riveting claws 36 close to the stamping inclined surface 361. The two first guiding surfaces 362 are arranged on the side where the two riveting claws 36 are close to each other, and the arc openings of the two first guiding surfaces 362 face the riveting groove 34. The two first guiding surfaces 362 bend the two bent parts towards the direction of approaching each other. An arc-shaped second guiding surface 371 is provided on one side of the riveting block 37 close to the riveting groove 34. The arc opening of the second guiding surface 371 faces the riveting groove 34. The second guiding surface 371 further bends and folds the two bent parts towards the slider 35. The riveting claws 36 break through the workpiece by using the inclined stamping inclined surface 361 to form a bent part. The arc-shaped first guiding surface 362 bends the bent part towards the direction of approaching each other. The second guiding surface 371 of the riveting block 37 further presses the bent part. The bent parts are tightly folded and pressed together under the sequential action of the first guiding surface 362 and the second guiding surface 371. The workpieces stacked together are riveted together under the action of the folded and pressed bent parts.

[0060] Refer to Figure 4 and Figure 5, on one side of the slider 35 close to the first cover 31, an installation groove 351 is provided. The installation groove 351 is provided with two guiding sections arranged along the length direction of the riveting claws 36 and a butting section perpendicular to the length direction of the gun body 11. The butting section connects the two guiding sections. The riveting claws 36 are installed in the guiding sections. At positions of the two riveting claws 36 far away from the riveting groove 34, abutting parts 363 are fixedly connected. The abutting parts 363 are arranged on the side where the two riveting claws 36 are close to each other. The abutting parts 363 are located in the butting section of the installation groove 351. The side of the abutting part 363 far away from the riveting groove 34 abuts against the side wall of the butting section far away from the riveting groove 34. An elastic buffer block 352 is placed at a position corresponding to the position between the two abutting parts 363 in the butting section of the installation groove 351. The buffer block 352 can be made of rubber or plastic. The buffer block 352 is used to buffer the force of the two abutting parts 363 approaching each other. On the side where the two riveting claws 36 are far away from each other, the first cover 31 is threadedly connected with ball detent screws 311 respectively. The two ball detent screws 311 respectively abut against the side where the two riveting claws 36 are far away from each other. During the process that the riveting claws 36 punch a bending part on the workpiece, the reaction forces of the workpiece on the punching inclined surface 361 and the first guiding surface 362 cause the two riveting claws 36 to receive a force away from each other. The two riveting claws 36 swing and deform in the direction away from each other under the buffering of the ball detent screws 311. Due to the lever principle, the abutting parts 363 of the two riveting claws 36 move in the direction of approaching each other. The buffer block 352 uses its own deformation to buffer the force of the two abutting parts 363 approaching each other. The ball detent screws 311 and the buffer block 352 cooperate with each other to provide support and buffering for the riveting claws 36 while giving the riveting claws 36 an appropriate swinging space, and reduce the probability of plastic deformation of the riveting claws 36 under the reaction force of the workpiece.

[0061] Referring to Figure 6 and Figure 7 , the trigger assembly 4 includes an air inlet channel 41, an air return channel 43, an oil inlet channel 45 and a trigger hole 48 opened in the grip 12. The air inlet channel 41, the air return channel 43 and the oil inlet channel 45 are arranged along the length direction of the grip 12. The trigger hole 48 is arranged along the length direction of the gun body 11. The trigger hole 48 communicates with the air inlet channel 41 and the air return channel 43. The air inlet channel 41 communicates with an air inlet pipe 42. The air inlet pipe 42 is connected to the main air delivery pipe 97 through the riveting host 5. The air return channel 43 communicates with an air return pipe 44. The pressurized air in the air return pipe 44 can trigger the operation of the riveting host 5. The oil inlet channel 45 communicates with an oil inlet pipe 46. The oil inlet pipe 46 is filled with hydraulic oil from the riveting host 5.

[0062] Referring to Figure 6 and Figure 7, a trigger piston 481 is slidably sealed at the position of the grip 12 corresponding to the trigger hole 48. A trigger groove 482 is formed in the trigger piston 481. The air inlet passage 41 is communicated with the air return passage 43 through the trigger groove 482 and the trigger hole 48. The grip 12 is rotatably connected with a pressure handle 47. When the pressure handle 47 is pinched, the trigger piston 481 is pushed to slide away from the pressure handle 47. The trigger piston 481 is connected with a third return spring 484, and the third return spring 484 applies a force to the trigger piston 481 to approach the pressure handle 47. An elastic seal 483 is fixedly connected to the trigger piston 481 on the side of the trigger groove 482 away from the pressure handle 47. The seal 483 is slidably sealed with the trigger hole 48, and the seal 483 can isolate the air inlet passage 41 and the air return passage 43.

[0063] When the pressure handle 47 is pinched, the trigger piston 481 moves away from the pressure handle 47, the third return spring 484 is compressed, the trigger groove 482 communicates the air inlet passage 41 and the air return passage 43, and the riveting main body 5 converts the air pressure of the air source into oil pressure and increases the pressure. The pressurized hydraulic oil drives the riveting assembly 3 through the oil inlet passage 45.

[0064] When the pressure handle 47 is released, the trigger piston 481 moves towards the pressure handle 47, the third return spring 484 extends, the seal 483 moves to the position between the trigger hole 48 corresponding to the air inlet passage 41 and the air return passage 43, the air inlet passage 41 and the air return passage 43 are disconnected, the riveting main body 5 releases the drive on the riveting assembly 3, and the hydraulic oil flows to the riveting main body 5 through the oil inlet passage 45.

[0065] Refer to Figure 3 and Figure 7 , the driving assembly 2 includes a piston chamber 21 formed in the gun body 11. The piston chamber 21 is arranged along the length direction of the gun body 11. A piston rod 22 that slides along the length direction of the gun body 11 is slidably sealed in the piston chamber 21. The cross-sectional area of the piston rod 22 is larger than the cross-sectional area of the riveting claw 36. The piston rod 22 is driven by the hydraulic oil in the oil inlet passage 45. When the hydraulic oil is pressurized, the piston rod 22 drives the slider 35 to slide towards the riveting groove 34.

[0066] Refer to Figure 3 and Figure 4 , the slider 35 is fixedly connected to the piston rod 22 at the position close to the riveting groove 34. A convex block 23 is fixedly connected to one end of the piston rod 22 close to the riveting groove 34. The convex block 23 can abut against the position of the riveting block 37 away from the second guiding surface 371. When the convex block 23 pushes the riveting block 37 to rotate away from the second guiding surface 371 towards the second cover 32, the second guiding surface 371 rotates towards the riveting groove 34.

[0067] Refer to Figure 3 and Figure 4, a guiding groove 372 is formed on one side of the riveting block 37 away from the second guiding surface 371. The guiding groove 372 is located on the side of the riveting block 37 away from the convex block 23. A second return spring 381 is fixedly connected to the position of the third cover 33 corresponding to the guiding groove 372. The second return spring 381 is arranged along the length direction of the gun body 11. One end of the second return spring 381 away from the third cover 33 is fixedly connected with a top block 38. The second return spring 381 applies a force to the top block 38 to abut against the riveting block 37, and the top block 38 abuts against the riveting block 37 at the position corresponding to the guiding groove 372. After the riveting action is completed, the second return spring 381 facilitates the riveting block 37 to return to the initial state, and the second guiding surface 371 of the riveting block 37 rotates to a position away from the slider 35. The sliding fit between the top block 38 and the guiding groove 372 improves the stability during the telescopic process of the second return spring 381 and the smoothness of the contact between the second return spring 381 and the abutting block.

[0068] Refer to Figure 3 and Figure 4 , a backing plate 25 is fixedly connected to the position of the third cover 33 corresponding to the piston rod 22. The backing plate 25 abuts against a first return spring 24. The first return spring 24 is arranged along the length direction of the gun body 11. One end of the first return spring 24 away from the backing plate 25 abuts against one end of the piston rod 22 close to the riveting groove 34. The first return spring 24 applies a force to the piston rod 22 in the direction away from the riveting groove 34. After the hydraulic oil is depressurized, the first return spring 24 pushes the piston rod 22 and the slider 35 to move away from the riveting groove 34. The first return spring 24 facilitates the smooth reset of the piston rod 22 after the riveting action is completed. The backing plate 25 isolates the first return spring 24 from the riveting block 37, reducing the probability of mutual interference between the first return spring 24 and the riveting block 37.

[0069] Refer to Figures 8-10 , the riveting main body 5 includes a pneumatic-hydraulic transmission component 8 and a slide valve component 7. The pneumatic-hydraulic transmission component 8 converts pneumatic energy into hydraulic energy to drive the riveting component 3 to work. The pneumatic-hydraulic transmission component 8 pressurizes the hydraulic oil by using a pressure air source and then conveys it to the riveting gun 1; the slide valve component 7 is triggered by the triggering component 4 to control the working state of the pneumatic-hydraulic transmission component 8.

[0070] Refer to Figure 10 and Figure 11 , the pneumatic-hydraulic transmission component 8 includes a first cylinder block 81, an upper end cover 6 and a lower end cover 85. An air chamber 82 is formed in the first cylinder block 81 along the length direction of the cylinder block. The upper end cover 6 and the lower end cover 85 are arranged at both ends of the first cylinder block 81 to seal the air chamber 82. A pneumatic piston 83 is slidably connected to the position of the first cylinder block 81 corresponding to the air chamber 82. The pneumatic piston 83 is slidably sealed with the first cylinder block 81, and the pneumatic piston 83 slides along the length direction of the first cylinder block 81.

[0071] Refer to Figures 10-12, the upper end cover 6 is provided with a main air inlet port 61, a main air outlet port 62, a driving port 63, a trigger end air delivery port 64 and a trigger end air return port 65. The main air inlet port 61 is communicated with the main air delivery pipe 97, the main air outlet port 62 can be communicated with the driving port 63 through the slide valve assembly 7, and the driving port 63 is communicated with the position of the air cavity 82 corresponding to the position between the upper end cover 6 and the pneumatic piston 83. One side of the pneumatic piston 83 away from the upper end cover 6 abuts against a fifth return spring 84, one end of the fifth return spring 84 away from the upper end cover 6 abuts against the lower end cover 85, and the fifth return spring 84 gives the pneumatic piston 83 a force close to the upper end cover 6. The lower end cover 85 is provided with a pressure relief hole 851, the pressure relief hole 851 is communicated with the position of the air cavity 82 corresponding to the position between the lower end cover 85 and the pneumatic piston 83, and a second filter element 852 is connected to the lower end cover 85 corresponding to the position of the pressure relief hole 851. As the pneumatic piston 83 reciprocates and slides, the pressure relief hole 851 discharges or inhales the gas between the pneumatic piston 83 and the lower end cover 85, reducing the resistance of the reciprocating movement of the pneumatic piston 83. The second filter element 852 filters the gas entering the first cylinder body 81, reducing the probability of dust and foreign objects entering the first cylinder body 81 and improving the operating stability of the pneumatic piston 83.

[0072] The trigger end air delivery port 64 is communicated with the intake pipe 42 and the main air inlet port 61, and the pressurized gas enters the intake pipe 42 from the main air inlet port 61 through the trigger end air delivery port 64. The trigger end air return port 65 is communicated with the return pipe 44 and the slide valve assembly 7.

[0073] Refer to Figure 10 and Figure 11 , on the side of the lower end cover 85 away from the upper end cover 6, a second cylinder body 86 is fixedly connected. The second cylinder body 86 is arranged along the length direction of the first cylinder body 81. An oil cavity 861 is arranged in the second cylinder body 86 along the length direction of the second cylinder body 86. A hydraulic oil pressing rod 862 is slidably sealed in the oil cavity 861, and the hydraulic oil pressing rod 862 slides along the length direction of the oil cavity 861. The hydraulic oil pressing rod 862 penetrates through the lower end cover 85, and one end of the hydraulic oil pressing rod 862 close to the upper end cover 6 is fixedly connected to the pneumatic piston 83. The pneumatic piston 83 drives the hydraulic oil pressing rod 862 to slide sealingly along the oil cavity 861. The cross-sectional area of the hydraulic oil pressing rod 862 is smaller than the cross-sectional area of the pneumatic piston 83, and the cross-sectional area of the piston rod 22 is smaller than the cross-sectional area of the pneumatic piston 83.

[0074] Refer to Figure 10 and Figure 11 , on one side of the first cylinder body 81, an oil storage cylinder 87 is installed. The oil storage cylinder 87 is filled with hydraulic oil. The oil storage cylinder 87 is communicated with the oil cavity 861 of the second cylinder body 86. The communication position between the oil cavity 861 and the oil storage cylinder 87 is close to the lower end cover 85. One end of the oil cavity 861 away from the lower end cover 85 is communicated with the oil inlet pipe 46.

[0075] Refer to Figure 10 and Figure 11, the spool valve assembly 7 includes a valve body 71. A top cover 77 is provided outside the valve body 71. A valve hole 711 is formed inside the valve body 71. A slide bar 712 is slidably connected to the valve body 71 at a position corresponding to the valve hole 711. First and second valve cores 713 and 714 are fixedly connected to both ends of the slide bar 712 respectively. Both the first valve core 713 and the second valve core 714 are slidably sealed with the valve hole 711. The diameter of the slide bar 712 is smaller than the diameter of the valve hole 711.

[0076] Referring to Figure 10 and Figure 11 , the valve body 71 is provided with a first air inlet port 73, a second air inlet port 74, a first air outlet port 75 and a second air outlet port 76 that communicate with the valve hole 711. The first air inlet port 73 can communicate with the first air outlet port 75 through the valve hole 711. The first air inlet port 73 is connected to the main path air outlet port 62. The first air outlet port 75 is connected to the first cylinder block 81 through the drive port 63. The first air outlet port 75 can also communicate with the second air outlet port 76 through the valve hole 711. The second air outlet port 76 communicates with the atmosphere. A first filter element 78 is installed at the position of the valve body 71 corresponding to the second air outlet port 76. The second air inlet port 74 communicates with the return air duct 44 through the trigger end return air port 65. The first filter element 78 filters dust and foreign objects entering the valve body 71, reducing the probability of the valve body 71 and the first cylinder block 81 being blocked.

[0077] Referring to Figure 10 and Figure 11 , the second air outlet port 76 is provided at one end of the valve body 71 corresponding to the valve hole 711. A fourth return spring 72 is placed in the valve hole 711. One end of the fourth return spring 72 away from the second air outlet port 76 abuts against the slide bar 712. The fourth return spring 72 gives a force to the slide bar 712 away from the second air outlet port 76. The first valve core 713 is located at the end of the slide bar 712 close to the second air outlet port 76, and the second valve core 714 is located at the end of the slide bar 712 away from the second air outlet port 76.

[0078] When the intake passage 41 of the trigger assembly 4 is disconnected from the return passage 43, the fourth return spring 72 moves the slide bar 712 to a position away from the second air outlet port 76. The first intake port 73 is located between the first valve core 713 and the second valve core 714, and the first valve core 713 isolates the first intake port 73 from the first air outlet port 75. The first air outlet port 75 communicates with the second air outlet port 76. When the intake passage 41 of the trigger assembly 4 communicates with the return passage 43, the pressurized gas enters the valve hole 711 corresponding to the side of the second valve core 714 away from the first valve core 713 from the second intake port 74. The pressurized gas pushes the slide bar 712 to move towards the second air outlet port 76 against the fourth return spring 72. The first intake port 73 and the first air outlet port 75 are located between the first valve core 713 and the second valve core 714. The first intake port 73 communicates with the first air outlet port 75, and the first valve core 713 isolates the first air outlet port 75 from the second air outlet port 76.

[0079] The implementation principle of the embodiment of the present application is as follows:

[0080] After stacking multiple workpieces to be riveted together and inserting them into the riveting groove 34, squeeze the pressing handle 47. The pressing handle 47 pushes the trigger piston 481 to overcome the elastic force of the third return spring 484. The trigger groove 482 communicates the intake passage 41 and the return passage 43. The pressurized gas from the air source passes through the air source triple unit 96, the main pipeline 97, the main intake port 61, the trigger end air supply port 64, the intake pipeline 42, the intake passage 41, the return passage 43, the return pipeline 44, the trigger end return air port 65, and the second intake port 74 and then enters the valve body 71. The pressurized gas entering the valve body 71 from the second intake port 74 pushes the second valve core 714 and the slide bar 712, etc., to move towards the second air outlet port 76 against the fourth return spring 72. After the movement, the first valve core 713 and the second valve core 714 make the first intake port 73 communicate with the first air outlet port 75 while isolating the first air outlet port 75 from the second air outlet port 76.

[0081] Then, the pressurized gas from the air source passes through the air source triple unit 96, the main pipeline 97, the main intake port 61, the main air outlet port 62, the first intake port 73, the first air outlet port 75, and the drive port 63 and then enters the air chamber 82 of the first cylinder body 81. The pressurized gas pushes the pneumatic piston 83 to move towards the second cylinder body 86. The pneumatic piston 83 pushes the oil pressing rod 862 to pressurize the hydraulic oil in the second cylinder body 86. The pressurized hydraulic oil enters the riveting gun 1 through the oil inlet pipeline 46 to provide power for the drive assembly 2. The drive assembly 2 drives the riveting assembly 3 to complete the riveting action.

[0082] After riveting is completed, release the pressure handle 47. The third return spring 484 extends, disconnecting the air intake passage 41 and the air return passage 43. The slide rod 712 returns to its original position against the elastic force of the fourth return spring 72. The first air outlet port 75 communicates with the second air outlet port 76 through the valve hole 711. The air chamber 82 is depressurized, and the pneumatic piston 83 and the oil pressing rod 862 return to their original positions, thereby realizing the reset of the driving assembly 2 and the riveting assembly 3.

[0083] The consumable-free riveting machine uses the bent part of the workpiece itself that is stamped and deformed to rivet multiple workpieces together, reducing the consumption of consumables such as rivets in the riveting process and reducing the processing cost of the workpiece for the enterprise. The pressure generated by the air source is gradually amplified through the pneumatic piston 83 to the oil pressing rod 862, the oil pressing rod 862 to the piston rod 22, and the piston rod 22 to the riveting claw 36, and is driven and amplified by the air source with a relatively low cost and relatively low pressure and converted into hydraulic drive, reducing the cost of the drive device of the consumable-free riveting machine while ensuring the pressure.

[0084] Each embodiment in this specification is described in a progressive manner. For the same or similar parts between the embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.

[0085] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A consumable-free riveting machine, characterized in that, it includes: a riveting assembly (3) for riveting multiple workpieces together; a pneumatic-hydraulic transmission assembly (8) connected to a gas source, which converts pneumatic energy into hydraulic energy to drive the riveting assembly (3) to work; a trigger assembly (4) for controlling the energy conversion of the pneumatic-hydraulic transmission assembly (8) and the start and stop of the riveting assembly (3); The riveting assembly (3) includes: a gun body (11) provided with a riveting groove (34) for placing the workpieces to be riveted; a slider (35) arranged on one side of the riveting groove (34) and sliding along the length direction of the gun body (11) under the drive of the pneumatic-hydraulic transmission assembly (8); riveting claws (36) installed on the slider (35), which punch multiple workpieces when moving towards the riveting groove (34), and a bending part is formed at the corresponding punched place of the workpieces, and the bending part is located on the side of the workpieces away from the slider (35); a riveting block (37) arranged on the side of the gun body (11) corresponding to the riveting groove (34) and the workpieces away from the slider (35), and the riveting block (37) moves towards the slider (35) and squeezes the bending part of the workpieces; There are two riveting claws (36), and at one end of the two riveting claws (36) close to the riveting groove (34), a stamping inclined surface (361) is provided, and the connection part between the bent part punched out of the workpiece by the stamping inclined surface (361) and the workpiece is located on the side where the two riveting claws (36) are close to each other; At the position of the two riveting claws (36) close to the stamping inclined surface (361), arc-shaped first guiding surfaces (362) are provided, and the two first guiding surfaces (362) are arranged on the side where the two riveting claws (36) are close to each other, and the two first guiding surfaces (362) make the two bending parts bend towards the direction of approaching each other; On the side of the riveting block (37) close to the riveting groove (34), an arc-shaped second guiding surface (371) is provided, and the arc opening of the second guiding surface (371) faces the riveting groove (34); The slider (35) is provided with an installation groove (351) for installing two riveting claws (36), and at the position of the two riveting claws (36) away from the riveting groove (34), abutting parts (363) are provided, and the abutting parts (363) are arranged on the side where the two riveting claws (36) are close to each other; On the side of the slider (35) corresponding to the two riveting claws (36) away from each other, ball screws (311) are provided respectively, and the two ball screws (311) abut against the side of the two riveting claws (36) away from each other; The riveting claws (36) are installed in the installation groove (351), there is a gap between the riveting claws (36) and the side wall of the installation groove (351), the abutting part (363) of the riveting claws (36) abuts against the side wall of the installation groove (351) away from the riveting groove (34), and an elastic buffer block (352) is provided at the position between the two abutting parts (363) of the installation groove (351), and the buffer block (352) is used for buffering the force of the two abutting parts (363) approaching each other.

2. The consumable-free riveting machine according to claim 1, characterized in that, the trigger assembly (4) includes: The grip (12) is provided with an air intake passage (41), a return air passage (43) and an oil inlet passage (45), and the air intake passage (41) is connected to an air source; The trigger piston (481) is slidably connected to the position of the grip (12) corresponding to the air intake passage (41) and the return air passage (43). The trigger piston (481) is provided with a trigger groove (482). As the trigger piston (481) slides, the trigger groove (482) can connect or disconnect the air intake passage (41) and the return air passage (43); When the trigger groove (482) connects the air intake passage (41) and the return air passage (43), the air-liquid transmission component (8) converts the air pressure of the air source into oil pressure and increases the pressure. The pressurized hydraulic oil drives the riveting component (3) through the oil inlet passage (45); When the air intake passage (41) and the return air passage (43) are disconnected, the air-liquid transmission component (8) releases the drive on the riveting component (3), and the hydraulic oil flows to the air-liquid transmission component (8) through the oil inlet passage (45).

3. A consumable-free riveting machine according to claim 2, wherein, The air-liquid transmission component (8) includes: The first cylinder block (81) has a pneumatic piston (83) slidably connected therein, and the air pressure of the air source drives the pneumatic piston (83) to move; The second cylinder block (86) has an oil pressing rod (862) slidably connected therein. The hydraulic oil is filled in the second cylinder block (86). The second cylinder block (86) is connected to the oil inlet passage (45). The oil pressing rod (862) is connected to the pneumatic piston (83). The cross-sectional area of the oil pressing rod (862) is smaller than that of the pneumatic piston (83). When the air source pressurizes the first cylinder block (81), the pneumatic piston (83) drives the oil pressing rod (862) to pressurize the hydraulic oil.

4. A consumable-free riveting machine according to claim 3, wherein, The driving component (2) includes: The piston rod (22) is slidably connected to the gun body (11). The cross-sectional area of the piston rod (22) is larger than that of the riveting claw (36) and smaller than that of the oil pressing rod (862). The piston rod (22) is driven by the hydraulic oil of the air-liquid transmission component (8). When the hydraulic oil is pressurized, the piston rod (22) drives the slider (35) to move towards the riveting groove (34); The first return spring (24) applies a force to the piston rod (22) in the direction away from the riveting groove (34). After the hydraulic oil is depressurized, the first return spring (24) pushes the piston rod (22) and the slider (35) to move away from the riveting groove (34).

5. A consumable-free riveting machine according to claim 4, wherein, The slide valve component (7) includes: The valve body (71) is provided with a valve hole (711). A slide rod (712) is slidably connected to the valve body (71) at the position corresponding to the valve hole (711). Both ends of the slide rod (712) are respectively connected with a first valve core (713) and a second valve core (714). Both the first valve core (713) and the second valve core (714) are slidably sealed with the valve hole (711). The diameter of the slide rod (712) is smaller than the diameter of the valve hole (711); The valve body (71) is provided with a first air inlet port (73), a second air inlet port (74), a first air outlet port (75) and a second air outlet port (76) that communicate with the valve hole (711). The first air inlet port (73) can communicate with the first air outlet port (75) through the valve hole (711). The first air inlet port (73) is connected to the air source, the first air outlet port (75) is connected to the first cylinder block (81), and the first air outlet port (75) can also communicate with the second air outlet port (76) through the valve hole (711). The second air outlet port (76) communicates with the atmosphere, and the second air inlet port (74) communicates with the air return channel (43) of the trigger assembly (4). The second air outlet port (76) is arranged at one end of the valve body (71) corresponding to the valve hole (711). The valve body (71) is provided with a fourth return spring (72). The fourth return spring (72) applies a force to the slide rod (712) away from the second air outlet port (76). The first valve core (713) is located at one end of the slide rod (712) close to the second air outlet port (76), and the second valve core (714) is located at one end of the slide rod (712) away from the second air outlet port (76).

6. An expendable-free riveting machine according to claim 1, characterized in that, a movable hanging bracket (9) is provided, and the movable hanging bracket (9) includes: a frame body (91) for installing the air-liquid transmission assembly (8) and the riveting assembly (3); a base (94) provided with a plurality of universal wheels (95), and the frame body (91) is installed on the base (94).

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