Hand riveter

Abstract

The utility model discloses a hand riveter which comprises a riveter body, a grip and an air cylinder which are sequentially connected from top to bottom. The gun body comprises a hand riveter head and a first hydraulic oil cylinder; a second hydraulic oil cylinder is arranged in the grip; a second piston of the air cylinder extends to an inner cavity of the second hydraulic oil cylinder, and the inner cavity of the second hydraulic oil cylinder is communicated with a rod cavity of the first hydraulic oil cylinder. The cylinder is connected with an air source through a first control valve; the first control valve is suitable for controlling gas output by the gas source to be discharged into a rodless cavity of the air cylinder, so that the riveting gun head performs riveting action; a second control valve is arranged between the first control valve and the air source, and the second control valve is suitable for blocking communication between the air cylinder and the air source when the pressure in the second hydraulic oil cylinder is larger than or equal to the preset pressure. Through the cooperation of the first control valve and the second control valve, whether the oil pressure in the second hydraulic oil cylinder exceeds the preset pressure or not is effectively monitored, so that overload of the hand riveter is prevented, and the safety performance of the hand riveter is improved.

Description

Technical Field

[0001] This utility model relates to the field of rivet gun technology, and specifically to a rivet gun. Background Technology

[0002] Rivet guns are used for fastening and riveting various metal sheets, pipes, and other materials in the manufacturing industry. In current rivet guns, the riveting motion involves the movement of a piston rod. The rivet gun stops riveting only when the end of the piston rod touches the stop sensor, at which point the user can then reverse the rivet gun to unrive the rivet.

[0003] Improper use of a rivet gun can easily lead to overload. Specifically, a rivet gun contains a hydraulic cylinder. The hydraulic cylinder converts hydraulic energy into mechanical energy to power the rivet gun head's linear reciprocating motion (the riveting action). Operating the hydraulic cylinder under overload conditions can cause significant damage, potentially rendering it unusable and shortening its lifespan, thus reducing the lifespan of the rivet gun itself.

[0004] In addition, existing rivet guns cannot meet the rivet requirements of products with different thicknesses, meaning that the adaptability of rivet guns is low. Utility Model Content

[0005] The technical problem to be solved by this utility model is that existing rivet guns are prone to overload and have low safety performance.

[0006] This utility model discloses a rivet gun, including a gun body, a grip, and a cylinder;

[0007] The gun body, the grip, and the cylinder are connected sequentially from top to bottom;

[0008] The gun body includes a rivet gun head and a first hydraulic cylinder for driving the rivet gun head to perform a rivet action; the first hydraulic cylinder is located behind the rivet gun head;

[0009] The grip is equipped with a second hydraulic cylinder for driving the first hydraulic cylinder to perform an action.

[0010] The second piston of the cylinder extends into the inner cavity of the second hydraulic cylinder, and the inner cavity of the second hydraulic cylinder is connected to the rod cavity of the first hydraulic cylinder; the cylinder is adapted to drive the second hydraulic cylinder to perform an action.

[0011] The cylinder is connected to a gas source via a first control valve; the first control valve is adapted to control the gas output from the gas source to be discharged into the rodless chamber of the cylinder to drive the second piston to perform an action, so that the rivet gun head performs a rivet action.

[0012] A second control valve is provided between the first control valve and the air source. The second control valve is adapted to block the connection between the air source and the cylinder when the pressure in the second hydraulic cylinder is greater than or equal to a preset pressure. Through the cooperation of the first and second control valves, the oil pressure in the second hydraulic cylinder is effectively monitored to prevent overload of the rivet gun and improve its safety performance.

[0013] Optionally, the first control valve includes a first housing and a first valve body;

[0014] The first housing is fixed to the cylinder; the first valve body is disposed in the inner cavity of the first housing;

[0015] The first valve body has a first cavity and a second cavity that are interconnected. A spring base is fixed in the first cavity and a control rod is slidably installed in the second cavity.

[0016] The spring base is provided with an air inlet that is connected to an air source, and the air inlet is adapted to supply air to the first cavity;

[0017] A first valve core is provided between the spring base and the control rod; the first valve core is fixedly connected to the spring base and is adapted to abut against the control rod;

[0018] The first valve core is placed in the first cavity, which is suitable for separating or connecting the first cavity and the second cavity;

[0019] A first hole is formed inside the first cavity;

[0020] The second cavity has a connecting hole that communicates with the rodless cavity of the cylinder;

[0021] When the first valve core separates the first chamber from the second chamber, the second control valve is adapted to connect the first hole to the second chamber when the pressure in the second hydraulic cylinder is less than the preset pressure, so that the gas output by the air inlet pushes the control rod to move towards the spring base, so that the first chamber and the second chamber are connected, thereby allowing the air inlet to supply air to the rodless chamber of the cylinder through the connecting hole;

[0022] When the first chamber and the second chamber are connected, the second control valve is adapted to block the communication between the first orifice and the second chamber when the pressure in the second hydraulic cylinder is greater than or equal to a preset pressure. This allows the first valve core to separate the first chamber and the second chamber under the rebound action of the spring base, thereby stopping the air inlet from supplying air to the rodless chamber of the cylinder. Using the above scheme, the gas output from the air source can be controlled to be discharged into the rodless chamber of the cylinder to drive the second piston, thereby causing the riveting gun head to perform a riveting action.

[0023] Optionally, a vent hole is also provided in the second cavity, which is adapted to connect the outside world with the second cavity;

[0024] When the first valve core separates the first chamber from the second chamber, the side wall of the control rod separates from the vent hole, so that the connecting hole communicates with the vent hole;

[0025] When the first chamber is connected to the second chamber, the side wall of the control rod is adapted to block the vent hole, thereby preventing communication between the connecting hole and the vent hole. This design allows the gas inside the cylinder to be released to the outside.

[0026] Optionally, the spring base includes a first spring and a first base;

[0027] The first end of the first base is fixed inside the first cavity, and the second end of the first base extends out of the first valve body and is located outside the first housing.

[0028] The first spring has two ends connected to the first base and the first valve core, respectively. An axial hole is formed in the center of the first base, and the air inlet is located at the second end of the first base. The gas output from the air inlet flows through the axial hole of the first base into the first cavity. This design allows the first valve core to reset.

[0029] Optionally, the control lever includes a second spring and a lever body;

[0030] The rod body includes a large-diameter section and a small-diameter section;

[0031] One end of the small-diameter portion is adapted to abut against the first valve core, and the other end is connected to the large-diameter portion; the large-diameter portion is slidably connected to the inner wall of the second cavity;

[0032] The second cavity has a second hole that communicates with the second cavity. The second hole and the connecting hole are distributed on both sides of the large-diameter portion. The large-diameter portion divides the second cavity into two independent cavities so that the second hole and the connecting hole are not connected. The second control valve is adapted to control the opening and closing between the second hole and the first hole.

[0033] The second spring is sleeved on the small diameter portion, one end of the second spring is fixed on the large diameter portion, and the other end of the second spring abuts against the inner wall of the second cavity.

[0034] Optionally, the second control valve includes a second housing and a second valve body assembled at the first end of the inner cavity of the second housing;

[0035] The second housing has an oil inlet, which communicates with the inner cavity of the second hydraulic cylinder;

[0036] The second valve core is slidably installed in the inner cavity of the second valve body; both ends of the second valve core extend out of the second valve body, with the first end extending into the oil inlet and the second end assembled on the second housing.

[0037] A third spring is fitted onto the second valve core; the two ends of the third spring are fixedly connected to the second valve core and the second valve body, respectively.

[0038] The second valve body has a third hole and a fourth hole that communicate with its inner cavity, and the second housing has two through holes that correspond to the third hole and the fourth hole respectively; the second valve body has an exhaust hole for the second end of the second valve core to pass through, and there is a gap between the exhaust hole and the second valve core;

[0039] The outer peripheral wall of the second valve core is provided with a first protrusion and a second protrusion at intervals to divide the inner cavity of the second valve body into multiple cavities, so that the fourth hole is connected to the exhaust hole or the third hole;

[0040] When the pressure on the first end of the second valve core is less than the preset pressure, the fourth hole is connected to the third hole; otherwise, the fourth hole is connected to the exhaust hole.

[0041] The third hole is connected to the first hole of the first control valve; the fourth hole is connected to the second hole of the first control valve; and the vent hole is connected to the outside. This design is used to prevent overloading of the rivet gun.

[0042] Optionally, the second end of the second valve core is mounted on the second housing via an adjusting base;

[0043] The adjusting base includes a second base, a rotary rod, and a fourth spring;

[0044] The second base is assembled at the second end of the inner cavity of the second housing, and its end away from the second valve body extends to the outside of the second housing;

[0045] The first end of the rotating rod is placed inside the second base and is threadedly connected to the second base; the second end of the rotating rod extends outside the second base; the rotating rod is provided with an axial through hole that connects the exhaust hole to the outside.

[0046] The first end of the fourth spring is fixedly connected to the second end of the second valve core, and the second end of the fourth spring is fixedly connected to the first end of the rotary rod;

[0047] The rotary rod is adapted to adjust the magnitude of the preset pressure. This design allows the rivet gun to adapt to different rivet requirements, improving its adaptability.

[0048] Optionally, the third hole, the fourth hole, and the exhaust hole are distributed sequentially along the axial direction of the second valve body;

[0049] The first protrusion and the second protrusion are spaced apart along the axial direction of the second valve body;

[0050] The compression direction of the third spring, the sliding direction of the second valve core, the axial direction of the second valve core, and the compression direction of the fourth spring are all parallel to each other. This design improves the stability of the second control valve.

[0051] Optionally, the lower middle part of the second hydraulic cylinder is provided with an oil outlet; the oil inlet of the second housing is connected to the inner cavity of the second hydraulic cylinder through the oil outlet.

[0052] Optionally, a switching valve is provided between the third hole and the first hole, and the switching valve is mounted on the trigger of the grip. This scheme controls the flow between the third hole and the first hole.

[0053] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0054] By coordinating the first and second control valves, the oil pressure in the second hydraulic cylinder is effectively monitored to prevent the rivet gun from overloading, improve the safety performance of the rivet gun, and extend its service life.

[0055] By setting an adjustable base, the rivet gun can be adapted to different rivet requirements, thus improving its adaptability.

[0056] By setting a vent hole, the gas inside the cylinder can be smoothly discharged to the outside.

[0057] The above description of the disclosed content and the following description of the embodiments are intended to demonstrate and explain the spirit and principles of this utility model, and to provide a further explanation of the scope of the patent application of this utility model. Attached Figure Description

[0058] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0059] Figure 1 This is a schematic diagram of the rivet gun in this utility model;

[0060] Figure 2 This is a partial cross-sectional schematic diagram of the rivet gun in this utility model;

[0061] Figure 3 This is a cross-sectional schematic diagram of the first control valve in this utility model;

[0062] Figure 4 This is a partial cross-sectional schematic diagram showing the connection between the first chamber and the second chamber of the first control valve in this utility model;

[0063] Figure 5 This is a partial cross-sectional schematic diagram showing that the first chamber and the second chamber of the first control valve in this utility model are not connected.

[0064] Figure 6 This is a cross-sectional schematic diagram of the second control valve in this utility model;

[0065] Figure 7 This is a partial cross-sectional schematic diagram showing the connection between the third and fourth holes of the second control valve in this utility model.

[0066] Figure 8 This is a partial cross-sectional schematic diagram showing the connection between the exhaust port and the fourth port of the second control valve in this utility model.

[0067] Figure 9 This is a partial cross-sectional schematic diagram of the second valve core in this utility model;

[0068] Figure 10 A simplified schematic diagram (I) of the gas flow path inside the rivet gun in this utility model;

[0069] Figure 11 A simplified schematic diagram (II) of the gas flow path inside the rivet gun in this utility model;

[0070] Figure 12 A simplified schematic diagram (III) of the gas flow path inside the rivet gun in this utility model;

[0071] Figure 13 This is a simplified schematic diagram (IV) of the gas flow path inside the rivet gun in this utility model.

[0072] Explanation of icon numbers:

[0073] 10. Gun body; 11. Riveting gun head; 111. Screw; 112. Front housing; 113. Connecting sleeve; 12. First hydraulic cylinder; 121. First piston; 122. Middle housing; 13. Drive device; 131. Motor; 132. Rear housing;

[0074] 20. Handle; 21. Second hydraulic cylinder; 211. Oil outlet; 22. Lower housing; 23. Trigger;

[0075] 30. Cylinder; 31. Base cylinder body; 32. Second piston;

[0076] 40. First control valve; 41. First housing; 42. First valve body; 421. First chamber; 422. Second chamber; 423. First hole; 424. Connecting hole; 425. Second hole; 426. Gas supply pipe; 427. Vent hole; 43. Air inlet; 44. Spring base; 441. First spring; 442. First base; 45. Control rod; 451. Second spring; 452. Rod body; 46. First valve core;

[0077] 50. Second control valve; 51. Second housing; 511. Oil inlet; 52. Second valve body; 521. Third hole; 522. Fourth hole; 523. Exhaust hole; 53. Adjusting base; 531. Second base; 532. Rotary rod; 533. Fourth spring; 54. Second valve core; 541. First protrusion; 542. Second protrusion; 543. Push rod; 55. Third spring;

[0078] 60. Switch valve; 61. First pipe; 62. Second pipe. Detailed Implementation

[0079] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0080] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0081] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0082] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided with," "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0083] This application also discloses a rivet gun. Please refer to [link / reference needed]. Figures 1-2 As shown, the rivet gun includes a gun body 10, a handle 20, a cylinder 30, a first control valve 40, and a second control valve 50. The gun body 10, handle 20, and cylinder 30 are connected sequentially from top to bottom. The gun body 10 includes a rivet gun head 11 and a first hydraulic cylinder 12. The first hydraulic cylinder 12 is located behind the rivet gun head 11. The first hydraulic cylinder 12 is used to drive the rivet gun head 11 to perform the rivet action. A second hydraulic cylinder 21 is provided inside the handle 20, and the second hydraulic cylinder 21 is used to drive the first hydraulic cylinder 12 to perform the action. The second piston 32 of the cylinder 30 extends into the inner cavity of the second hydraulic cylinder 21 to act as the piston of the second hydraulic cylinder 21. The inner cavity of the second hydraulic cylinder 21 communicates with the rod-side cavity of the first hydraulic cylinder 12. The cylinder 30 is adapted to drive the second hydraulic cylinder 21 to perform the action.

[0084] Cylinder 30 is connected to a gas source via a first control valve 40. The first control valve 40 is adapted to control the gas output from the gas source to be discharged into the rodless chamber of cylinder 30, thereby driving the second piston 32 to actuate, and thus causing the riveting gun head 11 to perform a riveting action. Specifically, when gas is injected into the rodless chamber of cylinder 30, the second piston 32 moves upward, so that the rod portion of the second piston 32 occupies more space in the second hydraulic cylinder 21, thereby allowing the hydraulic oil in the second hydraulic cylinder 21 to enter the rod chamber of the first hydraulic cylinder 12, causing the first piston 121 of the first hydraulic cylinder 12 to move. The first piston 121 drives the riveting gun head 11 to perform a riveting action.

[0085] A second control valve 50 is provided between the first control valve 40 and the air source. The second control valve 50 is adapted to block the connection between the air cylinder 30 and the air source when the pressure in the second hydraulic cylinder 21 is greater than or equal to a preset pressure, thereby preventing the rivet gun from being overloaded.

[0086] In this embodiment, the cooperation of the first control valve 40 and the second control valve 50 is used to prevent the second hydraulic cylinder 21 from being overloaded, thereby preventing the rivet gun from being overloaded, effectively protecting the rivet gun and extending its service life.

[0087] Please see Figures 1-2As shown, the gun body 10 includes not only the rivet gun head 11 and the first hydraulic cylinder 12, but also a drive device 13. The drive device 13 is used to drive the rivet gun head 11 to rotate. The rivet gun head 11, the first hydraulic cylinder 12, and the drive device 13 are arranged sequentially from front to back.

[0088] For details, please refer to Figure 2 As shown, the rivet gun head 11 includes a screw 111 and a front housing 112. The screw 111 is disposed within the front housing 112, and its front end extends outside the front housing 112. The screw 111 is adapted to be threadedly connected to the inner hole of the rivet sleeve. The first hydraulic cylinder 12 includes a first piston 121 and a middle housing 122. The middle housing 122 is mounted at the rear end of the front housing 112. The middle housing 122 is equivalent to the cylinder body of the first hydraulic cylinder 12. The first piston 121 is slidably disposed within the middle housing 122. The first piston 121 divides the inner cavity of the middle housing 122 into a front cavity (i.e., the rod-side cavity of the first hydraulic cylinder 12) and a rear cavity (i.e., the rodless cavity of the first hydraulic cylinder 12).

[0089] The rod of the first piston 121 passes through the front end of the middle housing 122 and extends into the front housing 112. The rod of the first piston 121 is connected to the rear end of the screw 111 via a connecting sleeve 113. Specifically, one end of the connecting sleeve 113 is rotatably connected to the rear end of the screw 111, and the other end is fixedly connected to the rod of the first piston 121. The first piston 121 has an axial through hole at its center. The drive device 13 includes a motor 131 and a rear housing 132. The rear housing 132 is installed at the rear end of the middle housing 122. The motor 131 is disposed inside the rear housing 132, and the drive shaft of the motor 131 passes sequentially through the axial through hole of the first piston 121 and the axial hole of the connecting sleeve 113, and is connected to the screw 111 to drive the screw 111 to rotate.

[0090] The drive shaft of the motor 131 is sealed to the axial through hole of the first piston 121.

[0091] In this embodiment, please refer to Figure 8 As shown, the rivet gun head 11 is prior art. Chinese patent document CN117733056A describes a rivet gun with force control function, detailing the structure of the rivet gun head 11. Therefore, it will not be elaborated upon here.

[0092] Please see Figure 2As shown, the grip 20 includes a second hydraulic cylinder 21 and a lower housing 22. The lower housing 22 is fixed to the bottom of the middle housing 122. The second hydraulic cylinder 21 is installed inside the lower housing 22. The middle housing 122 has a through hole communicating with the inner cavity of the second hydraulic cylinder 21, so that hydraulic oil in the second hydraulic cylinder 21 can enter the middle housing 122 through the through hole, thereby driving the first piston 121 to move. That is, the second hydraulic cylinder 21 can drive the first hydraulic cylinder 12 to move. In this embodiment, the inner cavity of the second hydraulic cylinder 21 is connected to the front cavity of the middle housing 122. The rear cavity of the middle housing 122 is connected to the outside.

[0093] Please see Figure 2 As shown, cylinder 30 includes a base cylinder body 31 and a second piston 32. The base cylinder body 31 is located at the bottom of the lower housing 22. The second piston 32 is slidably disposed within the base cylinder body 31. The rod of the second piston 32 extends upward, passing through the base cylinder body 31, the lower housing 22, and extending into the second hydraulic cylinder 21, thus acting as the piston of the second hydraulic cylinder 21. The second piston 32 divides the inner cavity of the base cylinder body 31 into an upper cavity (i.e., the rod chamber of cylinder 30) and a lower cavity (i.e., the rodless chamber of cylinder 30). When gas is injected into the lower cavity of the base cylinder body 31, the second piston 32 moves upward, so that the rod of the second piston 32 occupies more space within the second hydraulic cylinder 21, thereby allowing the hydraulic oil in the second hydraulic cylinder 21 to enter the front cavity of the middle housing 122, and the first piston 121 drives the screw 111 to move backward.

[0094] In this embodiment, the base cylinder 31 includes an upper cover and a lower cylinder. The first control valve 40 and the second control valve 50 are both mounted on the upper cover and located outside the base cylinder 31.

[0095] Please see Figures 2-5 As shown, the first control valve 40 includes a first housing 41, a first valve body 42, an air inlet 43, a spring base 44, a control rod 45, and a first valve core 46. The first housing 41 is fixed to the upper cover of the base cylinder 31. The first valve body 42 is disposed in the inner cavity of the first housing 41. The first valve body 42 has a first chamber 421 and a second chamber 422 that are interconnected. The spring base 44 is fixed in the first chamber 421. The spring base 44 is provided with an air inlet 43 that is connected to an air source. The air inlet 43 is adapted to supply air to the first chamber 421. The control rod 45 is slidably installed in the second chamber 422. The first valve core 46 is disposed between the spring base 44 and the control rod 45. One side of the first valve core 46 is fixedly connected to the spring base 44, and the other side of the first valve core 46 is adapted to abut against the control rod 45. The first valve core 46 is placed in the first chamber 421 and is adapted to separate or connect the first chamber 421 and the second chamber 422.

[0096] In this embodiment, the first valve core 46 is a spherical valve core. A valve core sealing cone surface is provided at one end of the first cavity 421 near the second cavity 422. When the first valve core 46 abuts against the valve core sealing cone surface (e.g....), Figure 5 As shown), the first chamber 421 and the second chamber 422 are independent of each other. At this time, the control rod 45 is not in contact with the first valve core 46. When the first valve core 46 separates from the valve core sealing cone surface (as shown), Figure 4 As shown), the first chamber 421 and the second chamber 422 are interconnected. At this time, the control rod 45 abuts against the first valve core 46.

[0097] A first hole 423 is provided in the first cavity 421. A connecting hole 424 is provided in the second cavity 422. The connecting hole 424 is connected to the lower cavity of the base cylinder 31 (i.e., the rodless cavity of the base cylinder 31). In this embodiment, a gas supply pipe 426 is connected between the connecting hole 424 and the lower cavity of the base cylinder 31. The gas supply pipe 426 is placed inside the base cylinder 31. The upper end of the gas supply pipe 426 is connected to the connecting hole 424, and the lower end of the gas supply pipe 426 slides through the second piston 32 and extends to the bottom of the lower cavity of the base cylinder 31. The gas supply pipe 426 is fixedly connected to the bottom of the lower cavity of the base cylinder 31. An air hole is provided at the lower end of the gas supply pipe 426 so that the gas flowing in the gas supply pipe 426 can be discharged to the lower cavity of the base cylinder 31.

[0098] When the first valve core 46 separates the first chamber 421 from the second chamber 422 (as... Figure 5 As shown), the second control valve 50 is adapted to connect the first hole 423 to the second chamber 422 when the pressure in the second hydraulic cylinder 21 is less than the preset pressure, so that the gas output from the air inlet 43 pushes the control rod 45 to move towards the spring base 44. Specifically, the gas output from the air inlet 43 passes through the first chamber 421, the first hole 423, and the second control valve 50 in sequence, and is finally discharged into the second chamber 422 to push the control rod 45 to move towards the spring base 44, thereby causing the first valve core 46 to separate from the valve core sealing cone surface, and the first chamber 421 and the second chamber 422 to connect (as shown). Figure 4 (As shown). At this time, the first spring 441 of the spring base 44 is in a compressed state; the gas output from the air inlet 43 passes through the first chamber 421 and the connecting hole 424 in sequence, and is finally discharged into the lower chamber of the base cylinder 31 to realize the supply of air to the base cylinder 31.

[0099] When the first cavity 421 is connected to the second cavity 422 (e.g.) Figure 4As shown), the second control valve 50 is adapted to block the communication between the first hole 423 and the second chamber 422 when the pressure in the second hydraulic cylinder 21 is greater than or equal to a preset pressure. At this time, the first spring 441, which is in a compressed state, rebounds to reset, so that the first valve core 46 abuts against the valve core sealing cone surface under the rebound action of the first spring 441, thereby separating the first chamber 421 and the second chamber 422 (as shown). Figure 5 As shown), this causes the air inlet 43 to stop supplying air to the lower chamber of the base cylinder 31.

[0100] In this embodiment, please refer to Figures 4-5 As shown, the spring base 44 includes a first spring 441 and a first base 442. A first end of the first base 442 is fixed inside the first cavity 421. A second end of the first base 442 extends outside the first valve body 42 and is located outside the first housing 41. Both ends of the first spring 441 are connected to the first base 442 and the first valve core 46, respectively. An axial hole is formed at the center of the first base 442. An air inlet 43 is disposed at the second end of the first base 442. Gas output from the air inlet 43 flows through the axial hole of the first base 442 into the first cavity 421.

[0101] In this embodiment, please refer to Figures 2-5 As shown, the control lever 45 includes a second spring 451 and a lever body 452. The lever body 452 includes a large-diameter portion and a small-diameter portion. The small-diameter portion is located near the first cavity 421, and the large-diameter portion is located away from the first cavity 421. One end of the small-diameter portion is adapted to abut against the first valve core 46, and the other end is connected to the large-diameter portion. The large-diameter portion is slidably connected to the inner wall of the second cavity 422. A second hole 425 is provided in the second cavity 422. The side wall of the large-diameter portion is sealed to the second cavity 422, and the large-diameter portion divides the second cavity 422 into two independent cavities, so that the second hole 425 and the connecting hole 424 are located on both sides of the large-diameter portion, that is, the second hole 425 and the connecting hole 424 are not connected. The second hole 425 is located on the side of the large-diameter portion away from the small-diameter portion. The connecting hole 424 is located on the side of the large-diameter portion near the small-diameter portion. The second hole 425 is connected to the second cavity 422. The second control valve 50 is adapted to control the opening and closing between the second hole 425 and the first hole 423. The second spring 451 is sleeved on the small-diameter portion. One end of the second spring 451 is fixed on the large-diameter portion. The other end of the second spring 451 abuts against the inner wall of the second cavity 422.

[0102] Furthermore, a vent hole 427 is also provided in the second chamber 422. The vent hole 427 is suitable for connecting the outside world to the second chamber 422. When the first valve core 46 separates the first chamber 421 from the second chamber 422, the side wall of the control rod 45 separates from the vent hole 427 (e.g., Figure 5(as shown), so that the connecting hole 424 is connected to the vent hole 427. When the first cavity 421 is connected to the second cavity 422, the side wall of the control rod 45 is adapted to block the vent hole 427 (as shown). Figure 4 (as shown), to block the connection between the connection hole 424 and the vent hole 427.

[0103] In this embodiment, the first housing 41 is provided with several through holes corresponding to the first hole 423, the connecting hole 424, the second hole 425 and the vent hole 427 respectively.

[0104] Please see Figures 6-8 As shown, the second control valve 50 includes a second housing 51, a second valve body 52, an adjusting base 53, a second valve core 54, and a third spring 55. The second housing 51 is hollow. The second valve body 52 is fixed to the first end of the inner cavity of the second housing 51. An oil inlet 511 is provided on the first end of the second housing 51. The oil inlet 511 communicates with the inner cavity of the second hydraulic cylinder 21. The second valve body 52 is hollow. The second valve core 54 is slidably mounted in the inner cavity of the second valve body 52. ​​Both ends of the second valve core 54 extend outside the second valve body 52. ​​The first end of the second valve core 54 extends into the oil inlet 511 via a push rod 543, and the second end of the second valve core 54 is mounted on the second housing 51 via the adjusting base 53. A third spring 55 is sleeved on the middle section of the second valve core 54. The third spring 55 is placed in the inner cavity of the second valve body 52. ​​The first end of the third spring 55 is fixedly connected to the stepped surface of the second valve core 54, and the second end of the third spring 55 is fixedly connected to the second valve body 52. Therefore, when the second valve core 54 slides within the second valve body 52, the third spring 55 can extend and retract.

[0105] In this embodiment, the first housing 41, the second housing 51, and the upper cover of the base cylinder 31 are an integral structure.

[0106] Furthermore, a third hole 521 and a fourth hole 522 are formed on the peripheral wall of the second valve body 52. ​​Two through holes corresponding to the third hole 521 and the fourth hole 522 are formed on the second housing 51. Both the third hole 521 and the fourth hole 522 communicate with the inner cavity of the second valve body 52. ​​An exhaust hole 523 is formed on the second valve body 52 for the second end of the second valve core 54 to pass through. A gap exists between the exhaust hole 523 and the second valve core 54. The third hole 521 is connected to the first hole 423. The fourth hole 522 is connected to the second hole 425. The exhaust hole 523 communicates with the outside.

[0107] The outer peripheral wall of the second valve core 54 is provided with a first protrusion 541 and a second protrusion 542 (e.g., Figure 9(As shown). The first protrusion 541 and the second protrusion 542 divide the inner cavity of the second valve body 52 into multiple cavities, so that the fourth hole 522 communicates with the exhaust hole 523, or the fourth hole 522 communicates with the third hole 521. Specifically, the communication between the third hole 521, the fourth hole 522, and the exhaust hole 523 includes the following two cases:

[0108] Scenario 1: Please refer to Figure 7 As shown, when the oil pressure in the oil inlet 511 is less than the preset pressure (i.e., the pressure on the first end of the second valve core 54 is less than the preset pressure), the fourth hole 522 is connected to the third hole 521; the exhaust hole 523 is in an isolated state, that is, the exhaust hole 523 is not connected to the fourth hole 522, nor is it connected to the third hole 521.

[0109] Scenario 2: Please refer to Figure 8 As shown, when the oil pressure in the oil inlet 511 is greater than or equal to the preset pressure (i.e., the pressure on the first end of the second valve core 54 is greater than or equal to the preset pressure), the fourth hole 522 is connected to the exhaust hole 523; the third hole 521 is in an isolated state, that is, the third hole 521 is not connected to the fourth hole 522, nor is it connected to the exhaust hole 523.

[0110] In this embodiment, the third hole 521, the fourth hole 522, and the exhaust hole 523 are sequentially distributed along the axial direction of the second valve body 52. ​​The first protrusion 541 and the second protrusion 542 are spaced apart along the axial direction of the second valve body 52. ​​Both the first protrusion 541 and the second protrusion 542 are convex rings. The first protrusion 541 is located on the side of the fourth hole 522 closest to the third hole 521. The second protrusion 542 is located on the side of the fourth hole 522 closest to the exhaust hole 523.

[0111] When the pressure on the push rod 543 is less than the preset pressure, please refer to Figure 8 As shown, the first protrusion 541 is located on the side of the third hole 521 away from the fourth hole 522, and the second protrusion 542 is located between the fourth hole 522 and the exhaust hole 523. At this time, both the first protrusion 541 and the second protrusion 542 are in a sealing fit with the inner wall of the second valve body 52. ​​The first protrusion 541 and the second protrusion 542 divide the inner cavity of the second valve body 52 into three non-communicating cavities. The third hole 521 and the fourth hole 522 are both located within the same cavity, meaning that the fourth hole 522 is connected to the third hole 521.

[0112] When the pressure on the push rod 543 is greater than or equal to the preset pressure, the first protrusion 541 is located between the third hole 521 and the fourth hole 522, and the second protrusion 542 is located between the fourth hole 522 and the vent hole 523. At this time, only the first protrusion 541 is sealed to the inner wall of the second valve body 52, while there is a gap between the second protrusion 542 and the inner wall of the second valve body 52. ​​The first protrusion 541 divides the inner cavity of the second valve body 52 into two non-communicating cavities, and the fourth hole 522 and the vent hole 523 are located in the same cavity, that is, the fourth hole 522 and the vent hole 523 are connected.

[0113] Furthermore, the first protrusion 541 is sealed to the inner wall of the second valve body 52 via a corresponding O-ring. The second protrusion 542 is also sealed to the inner wall of the second valve body 52 via a corresponding O-ring.

[0114] In this embodiment, the third spring 55 is a conical spring. The third spring 55 is placed inside the second valve body 52 and is located on the side of the second protrusion 542 away from the first protrusion 541. The first end of the third spring 55 is fixedly connected to the second protrusion 542, and its second end is fixedly connected to the inner wall of the second valve body 52.

[0115] In this embodiment, the lower middle part of the second hydraulic cylinder 21 is provided with an oil outlet 211 (e.g., ...). Figure 2 (As shown). The oil inlet 511 is connected to the oil outlet 211 through a corresponding pipeline, thereby enabling the oil inlet 511 to communicate with the inner cavity of the second hydraulic cylinder 21. Preferably, the oil outlet 211, the oil inlet 511, and the push rod 543 are placed at the same horizontal level.

[0116] Please see Figures 6-8 As shown, the adjusting base 53 is adapted to adjust the preset pressure to adapt the second control valve 50 to different working scenarios. Specifically, the adjusting base 53 includes a second base 531, a rotating rod 532, and a fourth spring 533. The second base 531 is fitted to the second end of the inner cavity of the second housing 51, and the end of the second base 531 away from the second valve body 52 extends outside the second housing 51. The first end of the rotating rod 532 is placed inside the second base 531 and is threadedly connected to it. The second end of the rotating rod 532 extends outside the second base 531. An axial through hole is provided on the rotating rod 532, which connects the exhaust port 523 to the outside. The first end of the fourth spring 533 is fixedly connected to the second end of the second valve core 54. The second end of the fourth spring 533 is fixedly connected to the first end of the rotating rod 532. The rotating rod 532 is adapted to adjust the preset pressure. Specifically, the user can adjust the compression of the fourth spring 533 by rotating the lever 532, thereby adjusting the preset pressure of the second control valve 50.

[0117] In this embodiment, the fourth spring 533 is a cylindrical ring spring. The compression direction of the third spring 55, the sliding direction of the second valve core 54, the axial direction of the second valve core 54, and the compression direction of the fourth spring 533 are parallel to each other.

[0118] Furthermore, a switching valve 60 is provided between the first hole 423 and the third hole 521. The switching valve 60 is mounted on the trigger 23 of the grip 20. In this embodiment, a first pipe 61 connects the switching valve 60 to the first hole 423. A second pipe 62 connects the switching valve 60 to the third hole 521.

[0119] This rivet gun is suitable for riveting rivet sleeves, and its working principle is as follows:

[0120] When the rivet gun performs the riveting action, the drive device 13 drives the screw 111 of the rivet gun head 11 to rotate in the forward direction, so that the screw 111 is threadedly connected to the inner hole of the rivet sleeve. At this time, please refer to Figure 10 As shown, the switch valve 60 is in the closed state (i.e., the first hole 423 and the third hole 521 are not connected); the elastic force of the first spring 441 is applied to the first valve core 46, so that the first valve core 46 separates the first chamber 421 and the second chamber 422; the vent hole 427 is connected to the second chamber 422; the second spring 451 is in the extended state, and the control rod 45 is separated from the first valve core 46 under the action of the second spring 451; the first piston 121 of the first hydraulic cylinder 12 is located at the front end of the inner cavity of the middle housing 122, and the second piston 32 of the cylinder 30 is located at the lower end of the inner cavity of the base cylinder 31. At this time, the first hydraulic cylinder 12 is in a low-pressure state, so the third hole 521 and the fourth hole 522 of the second control valve 50 are connected.

[0121] When the rivet gun is performing rivet work, the operator controls the switch valve 60 to be in the open state via trigger 23 (i.e., the first hole 423 is connected to the third hole 521). Please refer to [link / reference]. Figure 11As shown, the gas output from the intake nozzle 43 enters the first chamber 421 through the axial hole of the first base 442, and part of the gas then enters the first hole 423 through the first chamber 421. The gas in the first hole 423 passes sequentially through the switching valve 60, the third hole 521, the fourth hole 522, and the second hole 425, and finally enters the cavity in the second chamber 422 away from the rod 452. As the gas in this cavity increases, it pushes the control rod 45 to move closer to the spring base 44, thereby pushing the first valve core 46 to move closer to the spring base 44, thus separating the first valve core 46 from the valve core sealing cone surface, and connecting the first chamber 421 and the second chamber 422. At this time, the vent hole 427 is blocked, and the vent hole 427 is not connected to the second chamber 422. The gas output from the intake nozzle 43 passes sequentially through the first chamber 421, the second chamber 422, and the connecting hole 424 to enter the lower chamber of the base cylinder 31, thereby pushing the second piston 32 to move upward.

[0122] When the second piston 32 moves upward, its rod occupies more space within the second hydraulic cylinder 21, allowing hydraulic oil to enter the front cavity of the middle housing 122. This causes the first piston 121 to drive the screw 111 backward for riveting. During this process, the oil pressure within the second hydraulic cylinder 21 gradually increases. When the oil pressure within the second hydraulic cylinder 21 is greater than or equal to the preset pressure (i.e., the oil pressure at the inlet 511 is greater than or equal to the preset pressure), please refer to [further instructions]. Figure 12 As shown, the push rod 543 is subjected to force to drive the second valve core 54 to move towards the adjusting base 53, so that the first hole 423 and the third hole 521 are not connected.

[0123] Because the first hole 423 and the third hole 521 are not connected, the gas output from the air inlet 43 cannot sequentially pass through the switching valve 60, the third hole 521, the fourth hole 522, and the second hole 425 to enter the second chamber 422. Therefore, at this time, the second spring 451 of the control lever 45 extends and resets, and simultaneously the first spring 441 of the spring base 44 also extends and resets, so that the first valve core 46 again separates the first chamber 421 and the second chamber 422, i.e., the first chamber 421 and the second chamber 422 are not connected. During the reset of the control lever 45, please refer to... Figure 13 As shown, the gas in the second chamber 422 is discharged to the outside of the second control valve 50 through the second hole 425, the fourth hole 522 and the exhaust hole 523 in sequence.

[0124] When the first valve core 46 separates the first chamber 421 and the second chamber 422 again, please refer to Figure 13As shown, the vent 427 is connected to the second chamber 422, the air inlet 43 stops supplying air to the cylinder 30, the second piston 32 stops moving upward, and the first piston 121 stops moving backward. Afterward, the operator controls the switch valve 60 to be in the closed state via trigger 23, and controls the air inlet 43 to stop supplying air.

[0125] When the rivet gun is performing the riveting operation, the drive device 13 drives the screw 111 of the rivet gun head 11 to rotate in the opposite direction so that the screw 111 separates from the inner hole of the rivet sleeve.

[0126] After the screw 111 separates from the rivet sleeve, the components inside the rivet gun reset. Specifically, the gas in the lower cavity of the base cylinder 31 passes through the connecting hole 424 and the second cavity 422 in sequence, and finally exits to the outside through the vent hole 427. As the gas in the lower cavity of the base cylinder 31 decreases, the second piston 32 of the cylinder 30 moves downward to reset to the lower end of the inner cavity of the base cylinder 31. At the same time, the space occupied by the rod of the second piston 32 in the second hydraulic cylinder 21 decreases, allowing the hydraulic oil in the front cavity of the middle housing 122 to enter the second hydraulic cylinder 21, thereby resetting the first piston 121 of the first hydraulic cylinder 12 to the front end of the inner cavity of the middle housing 122. As the hydraulic oil enters the second hydraulic cylinder 21, the oil pressure in the second hydraulic cylinder 21 gradually decreases, causing the third spring 55 and the fourth spring 533 of the second control valve 50 to rebound and reset, that is, the second valve body 52 and the push rod 543 reset. After the second valve body 52 and the push rod 543 are reset, the third hole 521 and the fourth hole 522 are connected.

[0127] In summary, this embodiment effectively monitors whether the oil pressure in the second hydraulic cylinder exceeds the preset pressure through the cooperation of the first and second control valves, thus preventing the rivet gun from overloading, improving its safety performance, and extending its service life. The addition of a pressure regulating base allows the rivet gun to adapt to different rivet requirements, improving its adaptability. A vent hole ensures that gas in the cylinder can be smoothly discharged to the outside.

[0128] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A pull-rim gun, characterized by, Including the gun body, grip, and cylinder; The gun body, the grip, and the cylinder are connected sequentially from top to bottom; The gun body includes a rivet gun head and a first hydraulic cylinder for driving the rivet gun head to perform a rivet action; the first hydraulic cylinder is located behind the rivet gun head; The grip is equipped with a second hydraulic cylinder for driving the first hydraulic cylinder to perform an action. The second piston of the cylinder extends into the inner cavity of the second hydraulic cylinder, and the inner cavity of the second hydraulic cylinder is connected to the rod cavity of the first hydraulic cylinder; the cylinder is adapted to drive the second hydraulic cylinder to perform an action. The cylinder is connected to a gas source via a first control valve; the first control valve is adapted to control the gas output from the gas source to be discharged into the rodless chamber of the cylinder to drive the second piston to perform an action, so that the rivet gun head performs a rivet action. A second control valve is provided between the first control valve and the air source. The second control valve is adapted to block the connection between the cylinder and the air source when the pressure in the second hydraulic cylinder is greater than or equal to a preset pressure.

2. The rivet gun of claim 1, wherein, The first control valve includes a first housing and a first valve body; The first housing is fixed to the cylinder; the first valve body is disposed in the inner cavity of the first housing; The first valve body has a first cavity and a second cavity that are interconnected. A spring base is fixed in the first cavity and a control rod is slidably installed in the second cavity. The spring base is provided with an air inlet that is connected to an air source, and the air inlet is adapted to supply air to the first cavity; A first valve core is provided between the spring base and the control rod; the first valve core is fixedly connected to the spring base and is adapted to abut against the control rod; The first valve core is placed in the first cavity, which is suitable for separating or connecting the first cavity and the second cavity; a first hole is opened in the first cavity; a connecting hole is opened in the second cavity to communicate with the rodless cavity of the cylinder; When the first valve core separates the first chamber from the second chamber, the second control valve is adapted to connect the first hole to the second chamber when the pressure in the second hydraulic cylinder is less than the preset pressure, so that the gas output by the air inlet pushes the control rod to move towards the spring base, so that the first chamber and the second chamber are connected, thereby allowing the air inlet to supply air to the rodless chamber of the cylinder through the connecting hole; When the first chamber is connected to the second chamber, the second control valve is adapted to block the communication between the first orifice and the second chamber when the pressure in the second hydraulic cylinder is greater than or equal to a preset pressure, so that the first valve core separates the first chamber from the second chamber under the rebound action of the spring base, thereby stopping the air inlet from supplying air to the rodless chamber of the cylinder.

3. The rivet gun of claim 2, wherein, The second cavity is also provided with a vent hole, which is adapted to connect the outside world with the second cavity; When the first valve core separates the first chamber from the second chamber, the side wall of the control rod separates from the vent hole, so that the connecting hole communicates with the vent hole; When the first cavity is connected to the second cavity, the side wall of the control rod is adapted to block the vent hole to prevent communication between the connecting hole and the vent hole.

4. The rivet gun of claim 2, wherein, The spring base includes a first spring and a first base; The first end of the first base is fixed inside the first cavity, and the second end of the first base extends out of the first valve body and is located outside the first housing. The two ends of the first spring are connected to the first base and the first valve core, respectively; the center of the first base is provided with an axial hole, and the air inlet is provided at the second end of the first base. The gas output by the air inlet flows into the first cavity through the axial hole of the first base.

5. The rivet gun of claim 2, wherein, The control lever includes a second spring and a lever body; The rod body includes a large-diameter section and a small-diameter section; One end of the small-diameter portion is adapted to abut against the first valve core, and the other end is connected to the large-diameter portion; the large-diameter portion is slidably connected to the inner wall of the second cavity; The second cavity has a second hole that communicates with the second cavity. The second hole and the connecting hole are distributed on both sides of the large-diameter portion. The large-diameter portion divides the second cavity into two independent cavities so that the second hole and the connecting hole are not connected. The second control valve is adapted to control the opening and closing between the second hole and the first hole. The second spring is sleeved on the small diameter portion, one end of the second spring is fixed on the large diameter portion, and the other end of the second spring abuts against the inner wall of the second cavity.

6. The rivet gun of claim 1, wherein, The second control valve includes a second housing and a second valve body assembled at the first end of the inner cavity of the second housing; The second housing has an oil inlet, which communicates with the inner cavity of the second hydraulic cylinder; The second valve core is slidably installed in the inner cavity of the second valve body; both ends of the second valve core extend out of the second valve body, with the first end extending into the oil inlet and the second end assembled on the second housing. A third spring is fitted onto the second valve core; the two ends of the third spring are fixedly connected to the second valve core and the second valve body, respectively. The second valve body has a third hole and a fourth hole that communicate with its inner cavity, and the second housing has two through holes that correspond to the third hole and the fourth hole respectively; the second valve body has an exhaust hole for the second end of the second valve core to pass through, and there is a gap between the exhaust hole and the second valve core; The outer peripheral wall of the second valve core is provided with a first protrusion and a second protrusion at intervals to divide the inner cavity of the second valve body into multiple cavities, so that the fourth hole is connected to the exhaust hole or the third hole; When the pressure on the first end of the second valve core is less than the preset pressure, the fourth hole is connected to the third hole; otherwise, the fourth hole is connected to the exhaust hole. The third hole is connected to the first hole of the first control valve; the fourth hole is connected to the second hole of the first control valve; and the exhaust hole is connected to the outside.

7. The rivet gun of claim 6, wherein, The second end of the second valve core is mounted on the second housing via an adjusting base; The adjusting base includes a second base, a rotary rod, and a fourth spring; The second base is assembled at the second end of the inner cavity of the second housing, and its end away from the second valve body extends to the outside of the second housing; The first end of the rotating rod is placed inside the second base and is threadedly connected to the second base; the second end of the rotating rod extends outside the second base; the rotating rod is provided with an axial through hole that connects the exhaust hole to the outside. The first end of the fourth spring is fixedly connected to the second end of the second valve core, and the second end of the fourth spring is fixedly connected to the first end of the rotary rod; The rotary lever is adapted to adjust the magnitude of the preset pressure.

8. The rivet gun of claim 7, wherein, The third hole, the fourth hole, and the exhaust hole are distributed sequentially along the axial direction of the second valve body; The first protrusion and the second protrusion are spaced apart along the axial direction of the second valve body; The compression direction of the third spring, the sliding direction of the second valve core, the axial direction of the second valve core, and the compression direction of the fourth spring are all parallel to each other.

9. The rivet gun of claim 6, wherein, The lower middle part of the second hydraulic cylinder has an oil outlet; the oil inlet of the second housing is connected to the inner cavity of the second hydraulic cylinder through the oil outlet.

10. The rivet gun of claim 6, wherein, A switching valve is provided between the third hole and the first hole, and the switching valve is mounted on the trigger of the grip.

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