One-way valve structure for a riveting gun

Abstract

The present invention relates to the technical field of riveting guns, and specifically discloses a one-way valve structure for a riveting gun, which includes a handle; an oil cylinder is arranged on the handle; a motor is arranged in the oil cylinder; a motor cylinder is fixedly connected to the end of the motor; a stroke cylinder is arranged at the end of the oil cylinder; a commutation cavity is arranged in the motor cylinder; a motor forward rotation air path and a motor reverse rotation air path are arranged on the inner side wall of the commutation cavity; a first cavity is arranged in the motor cylinder; a second cavity and a third cavity are arranged on the inner side wall of the first cavity; the second cavity is communicated with the motor forward rotation air path; the third cavity is communicated with the motor reverse rotation air path; an air intake assembly pipe communicated with the inside of the first cavity is fixedly connected to the outer side wall of the handle; a ball is arranged in the first cavity; a push rod member is arranged in the second cavity; a piston is arranged in the third cavity; a driving assembly is arranged at the bottom of the handle; a pin rod member is arranged in the commutation cavity; by adding the structure of the one-way valve, the gun body can rotate fully during forward rotation and can also ensure the speed of nut withdrawal during reverse rotation.

Description

Technical Field

[0001] The present invention relates to the technical field of riveting guns, and in particular to a one-way valve structure for a riveting gun. Background Art

[0002] A riveting gun is a tool specifically used for riveting nuts. Using a riveting gun in the mechanical production process can effectively save labor and production time and improve production efficiency. According to the power type, riveting guns can be divided into electric riveting guns, manual riveting guns, and pneumatic riveting guns. Among them, pneumatic riveting guns have low costs and are easy to operate, and are increasingly widely used in actual use.

[0003] In the prior art, the forward and reverse rotations of a pneumatic riveting gun are controlled through an air circuit. During the long-term use of the riveting gun, it is easy to occur that the forward rotation riveting is not tight enough and the efficiency of reverse rotation to remove the nut is relatively low, thus affecting the use of the riveting gun. Summary of the Invention

[0004] The present application provides a one-way valve structure for a riveting gun, which has a structure with an added one-way valve, enabling the gun body to rotate fully during forward rotation and also ensuring the speed of removing the nut during reverse rotation.

[0005] A one-way valve structure for a riveting gun provided by the present application adopts the following technical solutions:

[0006] A one-way valve structure for a riveting gun includes a handle; an oil cylinder is arranged on the handle; a motor is arranged inside the oil cylinder; a motor cylinder is fixedly connected to the end of the motor away from the output shaft; a stroke cylinder covering the outside of the motor cylinder is arranged at the end of the oil cylinder close to the motor cylinder; a commutation cavity communicating with the external environment is arranged inside the motor cylinder; on the inner side wall of the commutation cavity, there are respectively a motor forward rotation air path communicating with the motor forward rotation air inlet and a motor reverse rotation air path communicating with the motor reverse rotation air hole; a first cavity is arranged inside the motor cylinder; a second cavity communicating with the first cavity is arranged on the inner side wall of the first cavity close to the motor; a third cavity is arranged on the inner side wall of the first cavity away from the second cavity; the second cavity communicates with the motor forward rotation air path; the third cavity communicates with the motor reverse rotation air path; an air connection assembly pipe is fixedly connected to the outer side wall of the handle; the air connection assembly pipe communicates with the inside of the first cavity; a ball is arranged inside the first cavity to make the first cavity not communicate with the second cavity; a push rod member capable of conducting the first cavity and the second cavity is arranged inside the second cavity; a piston capable of blocking the air connection assembly pipe and the third cavity is arranged inside the third cavity; a driving assembly capable of driving the piston to conduct the air connection assembly pipe and the third cavity is arranged at the bottom of the handle; a pin rod member capable of controlling the communication of the motor forward rotation air path and the motor reverse rotation air path with the external environment is arranged in the commutation cavity.

[0007] By adopting the above technical solution, compressed gas is conveyed into the first cavity through the air connection assembly pipe, so that in the initial state, the ball blocks the connection part between the first cavity and the second cavity, and the compressed gas will not directly enter the motor forward rotation hole. When the nut is installed, the push rod component conducts the first cavity and the second cavity, and the pin rod component closes the passage between the commutation cavity and the external environment. The compressed gas in the first cavity enters the motor forward rotation hole through the second cavity and the motor forward rotation air path, enabling the motor to rotate forward sufficiently and ensuring the fastening effect of the nut. When the motor needs to rotate in reverse, the piston is conducted between the first cavity and the third cavity through the driving component. At this time, the pin rod component makes the motor reverse air path not communicate with the external environment, and the motor forward rotation air path communicates with the external environment. When the compressed gas enters the motor reverse rotation hole through the first cavity and the third cavity, the gas inside the motor is discharged to the external environment through the motor forward rotation air path. The cooperation of intake through the motor reverse rotation hole and exhaust through the motor forward rotation hole ensures the speed of removing the nut.

[0008] Preferably, a first normally open air path communicating with the air connection assembly pipe is arranged inside the oil cylinder; a second normally open air path communicating the first normally open air path and the first cavity is arranged inside the motor cylinder; the push rod component includes a rotating central shaft fixedly connected to the output end of the motor and a thimble; a pull rod is connected to the end of the rotating central shaft far from the motor; the thimble is arranged through the motor, and the end of the thimble close to the pull rod is connected to the rotating central shaft, and the end of the thimble far from the pull rod extends into the second cavity, and the end of the thimble far from the pull rod can extend into the first cavity.

[0009] By adopting the above technical solution, the compressed gas entering the air connection assembly pipe enters the first cavity through the first normally open air path and the second normally open air path, so that the ball blocks the connection part between the first cavity and the second cavity. After installing the nut, the pull rod is pressed, and the pull rod pushes the thimble to move towards the ball through the rotating central shaft, causing a gap to appear at the blocked part of the ball, enabling the compressed gas to enter the motor forward rotation hole through the first cavity and the second cavity to promote the forward rotation of the motor.

[0010] Preferably, the driving component includes a hydraulic component and a reverse push rod; the reverse push rod is arranged at the end of the stroke cylinder far from the motor; the hydraulic component is arranged inside the oil cylinder, and the hydraulic component can drive the piston to contact and squeeze the reverse push rod.

[0011] By adopting the above technical solution, the hydraulic component drives the motor and the motor cylinder to move towards the reverse push rod, so that the reverse push rod squeezes the piston to move towards the ball, promoting the piston to conduct the second normally open air path and the motor reverse rotation hole, facilitating the compressed gas to enter the motor reverse rotation hole to promote the reverse rotation of the motor.

[0012] Preferably, the hydraulic component includes a motor main shaft sleeve fixedly connected to the motor, a hydraulic pipe, and a cylinder; the motor main shaft sleeve is arranged inside the oil cylinder, the motor main shaft sleeve covers the outside of the rotating central shaft, and an oil chamber is formed between the outer side wall of the motor main shaft sleeve and the side wall of the oil cylinder; the hydraulic pipe is arranged inside the handle, and the hydraulic pipe is communicated with the inside of the oil chamber; the cylinder is fixedly connected to the bottom of the handle, and the output end of the cylinder extends into the hydraulic pipe.

[0013] By adopting the above technical solution, starting the cylinder to convey the hydraulic oil inside the hydraulic pipe to the inside of the oil chamber, so that the hydraulic oil drives the motor and the motor cylinder to move towards the direction close to the reverse ejector rod, promoting the piston to come into contact and extrusion with the reverse ejector rod, and then realizing the conveyance of the compressed gas into the motor reverse hole.

[0014] Preferably, a ventilation gap is arranged inside the handle; the ventilation gap enables the air connection assembly pipe to be communicated with the first normally open air path.

[0015] By adopting the above technical solution, leaving a ventilation gap between the hydraulic pipe and the inner side wall of the handle enables the ventilation gap to conduct the air connection assembly pipe and the normally open air path after the overall assembly of the rivet gun, providing a channel for the flow of the compressed gas.

[0016] Preferably, a first annular groove is arranged on the outer side wall of the motor main shaft sleeve; a first O-ring is fixedly connected to the inner side wall of the annular groove.

[0017] By adopting the above technical solution, the first O-ring arranged in the first annular groove enables the oil chamber to have good sealing performance, so that the hydraulic oil is not likely to leak when driving the motor and the motor cylinder to move, reducing the possibility of the hydraulic oil entering the inside of the stroke cylinder.

[0018] Preferably, a second annular groove is arranged on the outer side wall of the piston extending into the first cavity; a second O-ring is fixedly connected to the inner side wall of the second annular groove.

[0019] By adopting the above technical solution, the second O-ring arranged in the second annular groove enables the air entering the third cavity from the second normally open air path to have good sealing performance, reducing the possibility of the compressed gas entering the third cavity leaking through the gap at the contact part between the piston and the inner side wall of the first cavity, so that the compressed gas fully enters the motor reverse hole to promote the reverse rotation of the motor.

[0020] Preferably, the commutation cavity is arranged in a stepped shape; the motor forward rotation air path is communicated with the inner part of the small aperture of the commutation cavity; the motor reverse rotation air path is communicated with the inner part of the large aperture of the commutation cavity; the pin member includes a commutation pin slidably arranged and capable of extending outside the motor cylinder; the commutation pin is slidably matched with the inner side wall of the commutation cavity; a first sealing member for respectively closing the air path between the motor forward rotation air path and the external environment and a second sealing member for closing the air path between the motor reverse rotation air path and the external environment are arranged on the commutation pin.

[0021] By adopting the above technical solution, the commutation cavity is set in a stepped shape to limit the sliding of the commutation cavity, so that the commutation pin is not easily detached from the inside of the commutation cavity. The setting of the first seal can block the passage between the forward rotation air path of the motor and the external environment, so that the compressed gas in the forward rotation air path of the motor can fully enter the forward rotation hole of the motor. The setting of the second seal blocks the passage between the reverse rotation air path of the motor and the external environment, so that the gas entering the reverse rotation hole of the motor is not easily leaked to the external environment through the reverse rotation air path and the commutation cavity.

[0022] Preferably, a first seal groove is provided on the outer side wall of the end of the commutation pin that can extend outside the motor cylinder; the first seal includes a first sealing ring; the first sealing ring is arranged in the first seal groove.

[0023] By adopting the above technical solution, when the end of the commutation pin extending outside the motor cylinder is pushed into the inside of the commutation cavity, the first sealing ring is deformed under pressure, blocking the passage between the commutation cavity and the external environment, so that the compressed gas entering the forward rotation air path of the motor can fully enter the forward rotation hole of the motor to promote the forward rotation of the motor.

[0024] Preferably, a second seal groove is provided on the outer side wall of the end of the commutation pin away from the first seal groove; the second seal includes a second sealing ring; the second sealing ring is arranged in the second seal groove.

[0025] By adopting the above technical solution, when the compressed gas enters the reverse rotation hole of the motor from the third cavity, part of the compressed gas enters the commutation cavity through the reverse rotation air path and pushes the end of the commutation pin provided with the first sealing ring to extend outside the motor cylinder, thereby conducting the passage between the forward rotation path of the motor and the external environment. The setting of the second sealing ring makes the compressed gas in the reverse rotation air path of the motor not easily leak through the commutation cavity, promoting the compressed gas to fully enter the reverse rotation hole of the motor.

[0026] In summary, the present application has the following beneficial effects:

[0027] 1. By pushing the commutation pin to make the first sealing ring enter the inside of the commutation cavity, the forward rotation air path of the motor is blocked from the external environment. When the compressed gas in the first cavity enters the second cavity from the first cavity, the compressed gas in the second cavity enters the forward rotation air path of the motor, and the compressed gas enters the forward rotation hole of the motor to make the motor rotate forward. Due to the setting of the first sealing ring, the gas in the forward rotation air path of the motor will not leak to the external environment, enabling the motor to rotate fully and ensuring the fastening effect of the nut.

[0028] 2. When the compressed gas enters the motor reversing hole, part of the compressed gas enters the reversing cavity through the motor reversing gas path, so that the end of the reversing pin provided with the first sealing ring extends to the outside of the motor barrel, so that the motor forward rotation hole and the motor forward rotation gas path are connected with the external environment. At this time, the gas in the motor can be discharged to the external environment through the motor forward rotation hole and the motor forward rotation gas path. At this time, the compressed gas in the motor reversing gas path will not leak through the reversing cavity due to the setting of the second sealing ring, so that the gas in the motor reversing gas path can fully enter the motor reversing hole to cause the motor to reverse, and the speed of the nut withdrawal is guaranteed by the coordinated work of the motor reversing hole air intake and the motor forward rotation hole exhaust; BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic cross-sectional structure diagram of a one-way valve structure for a rivet gun;

[0030] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure along line BB;

[0031] Figure 3 yes Figure 1 The enlarged view of point A in the middle;

[0032] Figure 4 When the motor rotates forward Figure 1 Schematic diagram of the cross-section structure along line DD;

[0033] Figure 5 It is a schematic diagram of the structure of the reversing pin in this application;

[0034] Figure 6 When the motor is reversed Figure 1 Schematic diagram of the cross-sectional structure along line DD.

[0035] Figure numerals: 1, handle; 11, air connection assembly pipe; 12, ventilation gap; 2, oil cylinder; 21, first normally open air path; 22, oil chamber; 3, motor; 4, motor cylinder; 41, reversing chamber; 42, motor forward air path; 43, motor reverse air path; 44, first cavity; 441, pinball; 45, second cavity; 46, third cavity; 47, second normally open air path; 5, stroke cylinder; 6, push rod; 61, rotating central axis; 62, ejector pin; 63, pull rod; 7. Piston; 71. Second annular groove; 72. Second O-ring; 8. Drive assembly; 81. Hydraulic component; 811. Motor main shaft sleeve; 812. Oil pipe; 813. Cylinder; 814. First annular groove; 815. First O-ring; 82. Reversing push rod; 9. Pin rod; 91. Reversing pin; 92. First sealing groove; 93. First sealing ring; 94. Second sealing groove; 95. Second sealing ring; 96. Large head; 97. Triangular cone; 98. Small head. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "bottom surface" and "top surface" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0037] The present invention discloses a one-way valve structure for a riveting gun, as Figure 1 , Figure 2 and Figure 3 shown, which includes a handle 1, an oil cylinder 2, a motor 3, a motor cylinder 4, a stroke cylinder 5 and an air intake assembly pipe 11; the oil cylinder 2 is arranged at the top of the handle 1, the motor 3 is arranged inside the oil cylinder 2, the motor cylinder 4 is fixedly connected to the end of the motor 3 far from the output shaft, the stroke cylinder 5 covers the outside of the motor cylinder 4, the stroke cylinder 5 is fixedly connected to the end of the oil cylinder 2 close to the motor cylinder 4, the air intake assembly pipe 11 is fixedly connected to the outer side wall of the handle 1, the air intake assembly pipe 11 is communicated with an external compressed gas, an air vent gap 12 communicated with the air intake assembly pipe 11 is arranged inside the handle 1, a first normally open air path 21 communicated with the air vent gap 12 is arranged inside the oil cylinder 2, and a second normally open air path 47 communicated with the first normally open air path 21 is arranged inside the motor cylinder 4; a first cavity 44 communicated with the second normally open air path 47 is arranged inside the motor cylinder 4; a second cavity 45 communicated with the first cavity 44 is arranged on the inner side wall of the first cavity 44 close to the motor 3, the inner diameter of the second cavity 45 is smaller than that of the first cavity 44, a third cavity 46 communicated with the first cavity 44 is arranged on the inner side wall of the first cavity 44 far from the motor 3, the inner diameter of the third cavity 46 is larger than that of the first cavity 44, a piston 7 for conducting the second normally open air path 47 and the third cavity 46 is slidably arranged inside the third cavity 46, the head of the piston 7 extends into the first cavity 44, a second annular groove 71 is arranged on the outer side wall of the piston 7 extending into the first cavity 44, a second O-ring 72 is fixedly connected to the inner side wall of the second annular groove 71, and a ball 441 for disconnecting the first cavity 44 and the second cavity 45 is arranged inside the first cavity 44.

[0038] The external compressed gas is conveyed into the air intake assembly pipe 11, and the compressed gas enters the first cavity 44 through the air vent gap 12, the first normally open air path 21 and the second normally open air path 47. The compressed gas entering the first cavity 44 urges the ball 441 to block the connection part between the first cavity 44 and the second cavity 45. Under the sealing action of the ball 441 and the second O-ring 72, in the initial state, the second normally open air path 47 is not communicated with the second cavity 45 and the third cavity 46, and at this time, the compressed gas is all located inside the first cavity 44.

[0039] As Figure 1 , Figure 3 and Figure 4As shown, a reversing cavity 41 communicating with the external environment is provided inside the motor cylinder 4; the reversing cavity 41 is arranged in a stepped shape. On the inner wall of the reversing cavity 41 with a smaller aperture, a motor forward rotation air path 42 communicating with the forward rotation air inlet of the motor 3 is provided. On the inner wall of the reversing cavity 41 with a larger aperture, a motor reverse rotation air path 43 communicating with the reverse rotation air hole of the motor 3 is provided; the motor forward rotation air path 42 communicates with the second cavity 45, and the motor reverse rotation air path 43 communicates with the third cavity 46. A pin member 9 for controlling the connectivity of the motor forward rotation air path 42 and the motor reverse rotation air path 43 with the external environment is provided inside the reversing cavity 41; the pin member 9 includes a reversing pin 91 that can extend to the outside of the motor cylinder 4, a first seal, and a second seal; the reversing pin 91 is slidably arranged on the inner wall of the reversing cavity 41. The reversing pin 91 is provided with a large head 96, a triangular cone portion 97, and a small head 98. The first seal is arranged on the outer side wall of the small head 98, and the first seal makes the motor forward rotation air path 42 not communicate with the external environment; the second seal is arranged on the outer side wall of the large head 96, and the second seal can make the motor reverse rotation air path 43 not communicate with the external environment; on the side of the motor 3 away from the motor cylinder 4, a push rod member 6 for conducting the first cavity 44 and the second cavity 45 is provided.

[0040] When it is necessary to supply air into the forward rotation hole of the motor 3, the reversing cavity 41 is sealed by the first seal and the second seal, so that the motor forward rotation air path 42 does not communicate with the external environment, and the motor reverse rotation air path 43 also does not communicate with the external environment. When installing the nut, after the push rod member 6 conducts the first cavity 44 and the second cavity 45, the compressed gas in the first cavity 44 enters the forward rotation hole of the motor 3 through the second cavity 45 and the motor forward rotation air path 42, promoting the full forward rotation of the motor 3 and ensuring the fastening effect of the nut.

[0041] As Figure 4 and Figure 5 As shown, a first seal groove 92 is provided on the outer side wall of the small head 98; the first seal includes a first sealing ring 93; the first sealing ring 93 is arranged in the first seal groove 92; a second seal groove 94 is provided on the outer side wall of the large head 96; the second seal includes a second sealing ring 95, and the second sealing ring 95 is fixedly connected in the second seal groove 94.

[0042] When installing the nut, the small head 98 is pressed into the reversing cavity 41. Under the action of the first sealing ring 93, the motor forward rotation air path 42 does not communicate with the external environment. Under the action of the second sealing ring 95, the motor reverse rotation air path 43 also does not communicate with the external environment, so that the compressed gas in the motor forward rotation air path 42 is not easily leaked through the reversing cavity 41, promoting the full entry of the compressed gas into the forward rotation hole of the motor 3.

[0043] As Figure 1 、 Figure 3 and Figure 4As shown, the push rod member 6 includes a rotation central axis 61, a thimble 62 and a pull rod 63. The rotation central axis 61 is rotatably connected to the output end of the motor 3. The pull rod 63 is fixedly connected to the end of the rotation central axis 61 away from the motor 3. The thimble 62 is disposed through the interior of the motor 3. The end of the thimble 62 near the output end of the motor 3 is fixedly connected to the rotation central axis 61. The end of the thimble 62 away from the pull rod 63 extends into the second cavity 45, and the end of the thimble 62 away from the pull rod 63 can extend into the first cavity 44 to press the ball 441.

[0044] When installing the nut, press the nut by hand so that the pull rod 63 drives the rotation central axis 61 and the thimble 62 to move, so that the end of the thimble 62 away from the rotation central axis 61 extends from the second cavity 45 into the first cavity 44 to push the ball 441, causing a gap to appear at the position originally blocked by the ball 441. At this time, the compressed gas enters the second cavity 45 from the first cavity 44, and the compressed gas entering the second cavity 45 then enters the forward rotation hole of the motor 3 through the forward rotation air path 42 of the motor, prompting the motor 3 to rotate forward sufficiently to ensure the fastening effect of the nut installation.

[0045] As Figure 1 、 Figure 3 and Figure 6 shown, a driving assembly 8 for driving the piston 7 to conduct the second normally open air path 47 and the third cavity 46 is provided at the bottom of the handle 1. The driving assembly 8 includes a reverse push rod 82 and a hydraulic member 81 for driving the piston 7 to be pressed against the reverse push rod 82. The reverse push rod 82 is disposed at the end of the stroke cylinder 5 away from the motor 3. The hydraulic member 81 is disposed inside the oil cylinder 2. The hydraulic member 81 includes a cylinder 813, an oil pipe 812 and a motor main shaft sleeve 811 sleeved outside the rotation central axis 61; the motor main shaft sleeve 811 is fixedly connected to the end of the motor 3 near the rotation central axis 61. The motor main shaft sleeve 811 is located inside the oil cylinder 2. An oil cavity 22 is formed between the outer side wall of the motor main shaft sleeve 811 and the inner side wall of the oil cylinder 2. The oil pipe 812 is fixedly connected inside the handle 1, and the oil pipe 812 communicates with the inside of the oil cavity 22. The cylinder 813 is fixedly connected to the bottom of the handle 1, and the output end of the cylinder 813 extends into the oil pipe 812; a first annular groove 814 is provided on the outer side wall of the motor main shaft sleeve 811, and a first O-ring 815 is fixedly connected to the inner side wall of the first annular groove 814.

[0046] After the nut riveting is completed, the hydraulic oil in the oil pipe 812 is pushed by the air cylinder 813 into the oil cavity 22 to cause the motor 3 and the motor cylinder 4 to move as a whole towards the direction close to the reverse ejector rod 82. The piston 7 on the motor cylinder 4 is extruded by the reverse ejector rod 82, so that the head of the piston 7 crosses the connection part between the first cavity 44 and the second normally open air passage 47. Then, the gas in the second normally open air passage 47 enters the third cavity 46 from the first cavity 44. The compressed gas then enters the reverse hole of the motor 3 through the third cavity 46 to cause the motor 3 to reverse. When the compressed gas enters the reverse hole of the motor 3, part of the compressed gas enters the inside of the commutation cavity 41 through the motor reverse air passage 43, and pushes the small head 98 of the commutation pin 91 to extend outside the motor cylinder 4, so that the motor forward rotation air passage 42 communicates with the external environment through the gap between the triangular cone part 97 and the inner side wall of the commutation cavity 41. At this time, the gas in the motor 3 can be discharged to the external environment through the motor forward rotation air passage 42. At this time, the compressed gas in the motor reverse air passage 43 will not leak through the commutation cavity 41 due to the setting of the second sealing ring 95, so that the gas in the motor reverse air passage 43 can fully enter the reverse hole of the motor 3 to cause the motor 3 to reverse. The cooperation of air intake through the reverse hole of the motor 3 and air exhaust through the forward hole of the motor 3 ensures the speed of removing the nut.

[0047] Working principle: The compressed gas is introduced into the handle 1 through the air connection assembly pipe 11. The compressed gas entering the ventilation gap 12 sequentially passes through the first normally open air passage 21 and the second normally open air passage 47 and enters the inside of the first cavity 44. The ball 441 inside the first cavity 44 blocks the connection position between the first cavity 44 and the second cavity 45 under the pressure of the compressed gas, so that the first cavity 44 and the second cavity 45 are not communicated.

[0048] Push the end of the commutation pin 91 extending outside the motor cylinder 4, so that the first sealing ring 93 enters the inside of the commutation cavity 41. The first sealing ring 93 blocks the motor forward rotation air passage 42 from the external environment. Install the nut on the pull rod 63, so that the pull rod 63 moves towards the direction close to the motor 3. During the movement of the pull rod 63, the rotating central shaft 61 and the ejector pin 62 are driven to move. The end of the ejector pin 62 away from the rotating central shaft 61 extends from the second cavity 45 into the first cavity 44 to push the ball 441, so that a gap appears at the position originally blocked by the ball 441. At this time, the compressed gas in the first cavity 44 enters the second cavity 45 from the first cavity 44. The compressed gas entering the second cavity 45 enters the motor forward rotation air passage 42. The compressed gas then enters the forward rotation hole of the motor 3 through the motor forward rotation air passage 42 to cause the forward rotation of the motor 3. Due to the setting of the first sealing ring 93, the gas in the motor forward rotation air passage 42 will not leak to the external environment, so that the motor 3 can rotate fully, ensuring the fastening effect of eating the nut.

[0049] After the nut riveting is completed, the cylinder 813 pushes the hydraulic oil in the oil pipe 812 into the oil cavity 22, causing the motor 3 and the motor cylinder 4 as a whole to move in the direction close to the reverse ejector rod 82. The piston 7 on the motor cylinder 4 is extruded through the reverse ejector rod 82, so that the head of the piston 7 extending into the first cavity 44 moves in the direction close to the ball 441. When the head of the piston 7 extending into the first cavity 44 crosses the connection part between the first cavity 44 and the second normally open gas path 47, the gas in the second normally open gas path 47 enters the third cavity 46 from the first cavity 44, and the compressed gas enters the reverse hole of the motor 3 from the third cavity 46 to cause the motor 3 to reverse;

[0050] When the compressed gas enters the reverse hole of the motor 3, part of the compressed gas enters the inside of the commutation cavity 41 through the motor reverse gas path 43, so that the end of the commutation pin 91 provided with the first sealing ring 93 extends outside the motor cylinder 4, realizing the communication between the forward hole of the motor 3, the motor forward gas path 42 and the external environment. At this time, the gas in the motor 3 can be discharged to the external environment through the forward hole of the motor 3 and the motor forward gas path 42. At this time, the compressed gas in the motor reverse gas path 43 will not leak through the commutation cavity 41 due to the setting of the second sealing ring 95, so that the gas in the motor reverse gas path 43 can fully enter the reverse hole of the motor 3 to cause the motor 3 to reverse. The cooperation of the intake through the reverse hole of the motor 3 and the exhaust through the forward hole of the motor 3 ensures the speed of removing the nut.

[0051] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A one-way valve structure for a riveting gun, characterized in that: It includes a handlebar (1); an oil cylinder (2) is arranged on the handlebar (1); a motor (3) is arranged inside the oil cylinder (2); a motor cylinder (4) is fixedly connected to the end of the motor (3) away from the output shaft; a stroke cylinder (5) covering the outside of the motor cylinder (4) is arranged at the end of the oil cylinder (2) close to the motor cylinder (4); a reversing cavity (41) communicating with the external environment is arranged inside the motor cylinder (4); a motor forward rotation air path (42) communicating with the forward rotation air inlet of the motor (3) and a motor reverse rotation air path (43) communicating with the reverse rotation air hole of the motor (3) are arranged on the inner side wall of the reversing cavity (41); a first cavity (44) is arranged inside the motor cylinder (4); a second cavity (45) communicating with the first cavity (44) is arranged on the inner side wall of the first cavity (44) close to the motor (3); a third cavity (46) is arranged on the inner side wall of the first cavity (44) away from the second cavity (45); the second cavity (45) communicates with the motor forward rotation air path (42); the third cavity (46) communicates with the motor reverse rotation air path (43); an air connection assembly pipe (11) is fixedly connected to the outer side wall of the handlebar (1); the air connection assembly pipe (11) communicates with the inside of the first cavity (44); a ball (441) that can disconnect the first cavity (44) from the second cavity (45) is arranged inside the first cavity (44); a push rod member (6) that can conduct the connection between the first cavity (44) and the second cavity (45) is arranged inside the second cavity (45); a piston (7) that can block the connection between the air connection assembly pipe (11) and the third cavity (46) is arranged inside the third cavity (46); a driving assembly (8) that can drive the piston (7) to conduct the connection between the air connection assembly pipe (11) and the third cavity (46) is arranged at the bottom of the handlebar (1); a pin rod member (9) that can control the connectivity between the motor forward rotation air path (42) and the motor reverse rotation air path (43) and the external environment is arranged in the reversing cavity (41); The reversing cavity (41) is arranged in a stepped shape; the motor forward rotation air path (42) communicates with the inner part of the small aperture of the reversing cavity (41); the motor reverse rotation air path (43) communicates with the inner part of the large aperture of the reversing cavity (41); the pin rod member (9) includes a reversing pin (91) slidably arranged and extending outside the motor cylinder (4); the reversing pin (91) is slidably matched with the inner side wall of the reversing cavity (41); a first sealing member for respectively closing the passage between the motor forward rotation air path (42) and the external environment and a second sealing member for closing the passage between the motor reverse rotation air path (43) and the external environment are arranged on the reversing pin (91); A first sealing groove (92) is arranged on the outer side wall of the end of the reversing pin (91) that can extend outside the motor cylinder (4); the first sealing member includes a first sealing ring (93); the first sealing ring (93) is arranged in the first sealing groove (92); A second sealing groove (94) is arranged on the outer side wall of the end of the reversing pin (91) away from the first sealing groove (92); the second sealing member includes a second sealing ring (95); the second sealing ring (95) is arranged in the second sealing groove (94).

2. The one-way valve structure for a riveting gun according to claim 1, characterized in that: Inside the oil cylinder (2), a first normally open air passage (21) communicated with the air connection assembly pipe (11) is provided; inside the motor cylinder (4), a second normally open air passage (47) communicating the first normally open air passage (21) with the first cavity (44) is provided; the push rod member (6) includes a rotation central shaft (61) fixedly connected to the output end of the motor (3) and a thimble (62); a pull rod (63) is connected to the end of the rotation central shaft (61) far away from the motor (3); the thimble (62) is disposed through the inside of the motor (3), the end of the thimble (62) close to the pull rod (63) is connected to the rotation central shaft (61), the end of the thimble (62) far away from the pull rod (63) extends into the second cavity (45), and the end of the thimble (62) far away from the pull rod (63) can extend into the first cavity (44).

3. The one-way valve structure for a riveting gun according to claim 1, characterized in that: The drive assembly (8) includes a hydraulic member (81) and a reverse ejector rod (82); the reverse ejector rod (82) is disposed at the end of the stroke cylinder (5) far away from the motor (3); the hydraulic member (81) is disposed inside the oil cylinder (2), and the hydraulic member (81) can drive the piston (7) to contact and extrude the reverse ejector rod (82).

4. The one-way valve structure for a riveting gun according to claim 3, characterized in that: The hydraulic member (81) includes a motor main shaft sleeve (811) fixedly connected to the motor (3), an oil pipe (812), and a cylinder (813); the motor main shaft sleeve (811) is disposed inside the oil cylinder (2), the motor main shaft sleeve (811) covers the outside of the rotation central shaft (61), and an oil cavity (22) is formed between the outer side wall of the motor main shaft sleeve (811) and the side wall of the oil cylinder (2); the oil pipe (812) is disposed inside the handle (1), and the oil pipe (812) is communicated with the inside of the oil cavity (22); the cylinder (813) is fixedly connected to the bottom of the handle (1), and the output end of the cylinder (813) extends into the oil pipe (812).

5. The one-way valve structure for a riveting gun according to claim 4, characterized in that: An air vent gap (12) is provided inside the handle (1); the air vent gap (12) enables the air connection assembly pipe (11) to be communicated with the first normally open air passage (21).

6. The one-way valve structure for a riveting gun according to claim 4, characterized in that: A first annular groove (814) is provided on the outer side wall of the motor main shaft sleeve (811); a first O-ring (815) is fixedly connected to the inner side wall of the annular groove.

7. The one-way valve structure for a riveting gun according to claim 1, characterized in that: A second annular groove (71) is provided on the outer side wall of the piston (7) extending into the first cavity (44); a second O-ring (72) is fixedly connected to the inner side wall of the second annular groove (71).

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