Hand riveter

Abstract

The invention discloses a hand riveter which is stable in clamping force on rivets and high in rivet pulling efficiency. The hand riveter comprises a clamping sleeve, a clamping jaw and a rivet arranging pipe assembly, the rivet arranging pipe assembly is arranged in the clamping sleeve, the clamping jaw is arranged in the clamping sleeve, the end of the clamping sleeve is provided with an abutting face facing the clamping jaw, the rivet arranging pipe assembly comprises an ejector rod and a rivet arranging pipe, the ejector rod is fixedly connected to the end of the rivet arranging pipe, and the clamping jaw is located between the abutting face and the ejector rod; the clamping sleeve is provided with a gas chamber, the gas chamber is located on the side, away from the clamping jaw, of the ejector rod, the gas chamber is filled with compressed gas, and the compressed gas is used for providing thrust towards the clamping jaw for the ejector rod; when the clamping sleeve moves towards the tail end, the ejector rod drives the clamping jaw to be tightly attached to the abutting face under the action of air pressure, and the abutting face abuts against the periphery of the clamping jaw so that the clamping jaw can clamp the nail rod. The diameter phi 1 of the gas chamber, the moving distance L of the ejector rod and the outer diameter phi 2 of the nail arranging pipe meet the following conditions.

Description

[0001] This application is a divisional application. The original application has the application number 202510800330.7 and the original application date is June 16, 2025. The original application is entitled "A Rivet Gun". The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of riveting tools, and more particularly to a rivet gun. Background Technology

[0003] A rivet gun is a tool used to install blind rivets, widely used in metal processing, automotive manufacturing, battery processing, aerospace, and other fields. It can replace welding processes and effectively solve the problem of weld penetration in sheet metal. A rivet gun includes a pull rod mechanism to transmit tension, pulling the rivet core outwards. Over long-term use, the spring in the pull rod mechanism can fatigue, reducing the clamping force of the rivet gun and causing rivet breakage, resulting in unsatisfactory products. Therefore, frequent spring replacements are necessary during rivet gun maintenance, impacting production efficiency and posing product quality risks. Summary of the Invention

[0004] To solve the above problems, the rivet gun provided in this application uses a gas chamber instead of a spring, which avoids the rivet gun's clamping force from decreasing and becoming unstable due to spring fatigue, thus preventing the rivet from breaking and causing the product to be scrapped.

[0005] This application provides a rivet gun, comprising: a clamping sleeve, a jaw, and a rivet tube assembly. The rivet tube assembly is disposed within the clamping sleeve, wherein the jaw is disposed within the clamping sleeve, and the end of the clamping sleeve has a pushing surface facing the jaw. The rivet tube assembly includes a push rod and a rivet tube, the push rod being fixedly connected to the end of the rivet tube, and the jaw being located between the pushing surface and the push rod. The clamping sleeve has a gas chamber located on the side of the push rod away from the jaw, and the gas chamber is filled with compressed gas, which provides a thrust to the push rod towards the jaw. When the clamping sleeve moves towards its tail end, under the action of air pressure, the push rod drives the jaw to fit tightly against the pushing surface, and the pushing surface pushes against the outer periphery of the jaw to clamp the rivet. The diameter of the gas chamber is Φ1, the moving distance of the push rod is L, and the outer diameter of the rivet tube is Φ2, satisfying the following conditions: .

[0006] In the above embodiment, the clamping sleeve, jaws, and pin-pile tube assembly constitute the riveting mechanism of the rivet gun. During riveting, the clamping sleeve applies a positive pulling force to the jaws, causing them to retract, and the jaws and push rod move towards the tail end. Under the pressure of compressed gas, the push rod provides a reverse thrust to the jaws, and the pin-pile tube assembly experiences bidirectional thrust and moves within the clamping sleeve. The compressed gas applies a reverse thrust towards the jaws to the push rod, ensuring that the jaws remain in contact with the abutment surface. Compared to using a spring to provide the reverse thrust, using a gas chamber to utilize air pressure as the reverse thrust on the jaws makes the clamping force of the jaws more reliable and prevents a decrease in clamping force due to spring fatigue. When the designed value exceeds the range mentioned above, under the same air pressure range, the jaw retraction speed will slow down, and the time it takes for the push rod to push the jaws to clamp the rivet rod and reach the preset clamping force will be longer, affecting the riveting efficiency. When the designed value is lower than the aforementioned design value, under the same air pressure range, the amount of compressed air in the gas chamber is less, which will cause unstable pressure on the push rod during riveting, resulting in unstable thrust of the push rod on the clamping jaws, thus leading to riveting failure. By rationally designing the relationship between the diameter Φ1 of the gas chamber, the outer diameter Φ2 of the pin pack tube, and the stroke L of the push rod in the clamping sleeve, it is possible to achieve rapid positioning and precise control of the clamping jaws during riveting, reducing riveting failure and efficiency. Attached Figure Description

[0007] Figure 1 This is a structural schematic diagram of a blind rivet in related technologies; Figure 2 A diagram showing the state changes of a blind rivet during riveting in related technologies; Figure 3 This is a structural diagram of a rivet gun in related technologies; Figure 4 This is a schematic diagram of the structure of a rivet gun provided in one embodiment of this application; Figure 5 A cross-sectional view of a riveting mechanism and a transmission mechanism provided in one embodiment of this application; Figure 6 An assembly drawing of a riveting mechanism and a transmission mechanism provided for one embodiment of this application; Figure 7 An exploded view of a riveting mechanism and a transmission mechanism provided in one embodiment of this application; Figure 8 A schematic diagram of the structure of a rivet gun provided for another embodiment of this application; Figure 9 This is a schematic diagram of the riveting mechanism and the adsorption mechanism provided in one embodiment of this application; Figure 10 This is a schematic diagram of the structure of the nail tube assembly and adsorption mechanism provided in one embodiment of this application; Figure 11 A schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided in one embodiment of this application; Figure 12 A schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided in another embodiment of this application; Figure 13 This is a schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided in another embodiment of this application.

[0008] Related technical figures and symbols: 01-Core rod; 02-Nail body; 011-Nail rod; 012-Head; 013-Break groove; 021-Nail cap; 022-Sleeve; 023-Expansion section; 00-Rivet gun; 001-Claw; 002-Sleeve; 003-Top rod assembly; 004-Spring; 005-Spring sleeve; 0031-Top head; 0032-Top rod; 004-Spring; 005-Spring sleeve.

[0009] Reference numerals in the accompanying drawings of the embodiments of this application: 1-Clamping sleeve; 2-Claw; 3-Pin tube assembly; 301-Push rod; 302-Pin tube; 101-Gas chamber; 102-Pushing surface; 4-Housing; 5-Nail head assembly; 501-Tip; 201-Claw plate; 6-Transmission mechanism; 601-Lead screw; 602-Lead screw nut; 100-Motor; 7-First seal; 8-Second seal; 9-Third seal; 112-Pushing section; 103-Extension section; 10-Gas tube connector; 40 1-Avoidance hole; 11-Adsorption mechanism; 111-Liquid storage chamber; 112-Negative pressure pipe; 1111-First surface; 1112-Second surface; 1101-Body; 1102-First opening; 1103-Fourth seal; 1104-Plunger; 1105-Second opening; 1106-Fifth seal; 11041-Boss; 1107-Liquid storage tank; 11071-First sidewall; 11072-Second sidewall; 11073-Bottom wall of the tank. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of the application is provided in conjunction with the accompanying drawings and embodiments.

[0011] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.

[0012] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0013] Spring fatigue refers to the phenomenon where, after a spring has been subjected to alternating stress (repeated loading and unloading) for a long period of time, microscopic damage gradually develops inside the material, eventually leading to a weakening of the spring's elasticity, deformation, or breakage. This is a typical manifestation of fatigue failure in metallic materials.

[0014] A blind rivet is a fastener that is installed from one side and is suitable for situations where it is not possible to operate from the back. Figure 1 This is a structural diagram of a blind rivet in related technologies, such as... Figure 1 As shown, a blind rivet consists of two parts: a core rod 01 and a rivet body 02. It is fixed by deformation through the pulling force of a rivet gun. The core rod 01 includes a head 012 and a shank 011. The shank 011 is a smooth or toothed metal rod used to transmit tensile force. The head 012 is located at the top of the shank 011 and is typically spherical or flat. A fracture groove 013, an annular groove, is provided on the shank 011 near the head 012. The rivet body 02 is sleeved on the outside of the core rod 01 and includes a rivet head 021, a sleeve 022, and an expansion section 023. The rivet head 021 and the expansion section 023 are located at opposite ends of the sleeve 022. Figure 2 This is a diagram showing the state changes of a blind rivet during riveting in related technologies, such as... Figure 2 As shown, during riveting, the head of the rivet gun 00 presses against the rivet head 021 against the workpiece and pulls the rivet rod 011 backward away from the head 012. The head 012 causes the expansion section 023 of the rivet body 02 to deform and roll inward. When the tension reaches the preset value, the rivet rod 011 breaks at the fracture groove 013, fixing the rivet body 02 and the head 012 to the workpiece.

[0015] In some related technologies, Figure 3 This is a structural diagram of a rivet gun in related technologies, such as... Figure 3 As shown, a rivet gun typically includes a chuck 001, a sleeve 002, a push rod assembly 003, a spring 004, and a spring sleeve 005. The chuck 001 is housed within the sleeve 002. The push rod assembly 003 is located on the side of the chuck 001 opposite to the rivet gun nozzle. The push rod assembly 003 includes a push head 0031 and a push rod 0032 located at the rear end of the push head 0031. A spring 004 is fitted onto the outer wall of the push rod 0032, and a spring sleeve 005 is located outside the spring 004. The spring 004 exerts its elastic force on the push rod 0032 to press against the chuck 001. During riveting, the sleeve 002 moves the chuck 001 backward, and the chuck 001 automatically tightens and clamps the rivet under the guidance of the inner conical surface of the sleeve 002.

[0016] The strength design of the fracture groove 013 of the rivet rod 011 needs to match the pulling force of the rivet gun. Because the spring 004 of the rivet gun will fatigue after a period of use, the preload of the spring 004 will decrease. This will prevent the push rod 0032 from properly engaging the chuck 001, resulting in a decrease in the clamping force of the chuck 001. During riveting, the chuck 001 is prone to slipping against the rivet rod 011, causing the pulling force of the rivet gun to fall below the preset value, leading to the abnormal breakage of the fracture groove 013 of the core rod 01.

[0017] In view of this, embodiments of this application provide a rivet gun that reduces the clamping force and instability of the rivet gun, preventing abnormal rivet breakage and product scrapping. Embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0018] Figure 4 A cross-sectional view of a rivet gun provided in one embodiment of this application. Figure 5 A cross-sectional view of a riveting mechanism provided in one embodiment of this application, as shown below. Figure 4 , Figure 5 As shown, the rivet gun provided in this application includes: a clamping sleeve 1, a jaw 2, and a rivet tube assembly 3. The rivet tube assembly 3 is disposed inside the clamping sleeve 1 and is movable relative to the clamping sleeve 1. The jaw 2 is also disposed inside the clamping sleeve 1. The end of the clamping sleeve 1 has a pushing surface 102 facing the jaw 2. The outer wall of the jaw 2 abuts against the pushing surface 102, and the jaw 2 is slidable along the pushing surface 102. The rivet tube assembly 3 includes a push rod 301 and a rivet tube 302. The push rod 301 is fixedly connected to the end of the rivet tube 302. The jaw 2 is located between the pushing surface 102 and the push rod 301. The jaw 2 and the push rod 301 are arranged sequentially along the axial direction of the clamping sleeve 1, and the push rod 301 abuts against the jaw 2. The clamping sleeve 1 has a gas chamber 101, which is located on the side of the push rod 301 opposite to the jaw 2. The gas chamber 101 is filled with compressed gas, which has pressure that always provides a thrust to the push rod 301 toward the gripper 2.

[0019] When the clamping sleeve 1 moves towards the tail end of the rivet gun, the pushing surface 102 causes the jaw 2 to retract, and the jaw 2 and the push rod 301 also move towards the tail end. Under the pressure of the compressed gas, the push rod 301 provides a reverse thrust to the jaw 2, making the jaw 2 fit tightly against the pushing surface 102. The pushing surface 102 pushes against the outer periphery of the jaw 2 to clamp the rivet rod. As the push rod 301 moves, the thrust on the jaw 2 gradually increases until the clamping force of the jaw 2 on the rivet rod reaches a preset value, and the clamping sleeve 1 stops moving. The diameter Φ1 of the gas chamber 101, the moving distance L of the push rod 301, and the outer diameter Φ2 of the rivet tube 302 satisfy the following: .

[0020] In the above embodiment, the clamping sleeve 1, the jaws 2, and the pin-pile assembly 3 constitute the riveting mechanism of the rivet gun. During riveting, the clamping sleeve 1 applies a positive pulling force to the jaws 2, causing them to retract. The pin-pile assembly 3 moves within the clamping sleeve 1 under bidirectional thrust, similar in principle to the syringe barrel and the movable plunger sliding within it; the movement of the movable plunger adjusts the air pressure within the barrel. Compressed gas applies a counter-thrust force towards the jaws 2 to the push rod 301, ensuring that the jaws 2 remain in contact with the pushing surface 102. Compared to using a spring to provide the counter-thrust force, using the gas chamber 101 to utilize air pressure as the counter-thrust force on the jaws 2 makes the clamping force of the jaws 2 more reliable and prevents a decrease in clamping force due to spring fatigue. When the designed value is higher than the range mentioned above, under the same air pressure range, the retraction speed of the gripper 2 will slow down, and the time it takes for the push rod 301 to push the gripper 2 to clamp the rivet rod and reach the preset value of the clamping force will be longer, affecting the riveting efficiency. When the designed value is lower than the aforementioned design value, under the same air pressure range, the amount of compressed air in the gas chamber 101 is less, which will cause unstable pressure on the push rod 301 during riveting, resulting in unstable thrust of the push rod 301 on the clamping jaw 2, thus leading to riveting failure. By rationally designing the relationship between the diameter Φ1 of the gas chamber 101, the outer diameter Φ2 of the pin pack tube 302, and the stroke L of the push rod 301 within the clamping sleeve 1, it is possible to achieve rapid positioning and precise control of the clamping jaw 2 during riveting, reducing riveting failure and efficiency. The values ​​can be, for example, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 1.7, 2, 3.5, 4.8, 5, 6.5, 7, 8, 9, 11, 12, 14, 20, 25, 30, etc., but are not limited to these values. It is worth noting that the moving distance of the push rod 301 is not equal to 0.

[0021] The compressed gas mentioned above can be, for example, air, nitrogen, or an inert gas, which offers a high level of safety.

[0022] Figure 6 An assembly drawing of the riveting mechanism and the transmission mechanism provided in one embodiment of this application. Figure 7 An exploded view of the riveting mechanism and transmission mechanism provided in one embodiment of this application, combined with... Figures 5-7In one embodiment, the rivet gun further includes a housing 4 and a head assembly 5. The head assembly 5 is installed at the opening of the housing 4. A clamping sleeve 1 and a jaw 2 are disposed within the housing 4, with at least a portion of the jaw 2 extending beyond the clamping sleeve 1. The clamping sleeve 1 is axially movable relative to the housing 4. The head assembly 5 is hollow and has a tip 501 facing the jaw 2. The tip 501 abuts against the portion of the jaw 2 extending beyond the clamping sleeve 1 to open the jaw 2. A recess is provided at the end of the jaw 2 facing the head assembly 5. In the initial state, the push rod 301 presses against the jaw 2, causing the jaw 2 to abut against the tip 501 of the head assembly 5. The tip 501 opens the jaw 2, allowing the rivet shank to be inserted into the clamping space of the jaw 2.

[0023] In one embodiment, the diameter Φ1 of the gas chamber 101 satisfies: 8mm ≤ Φ1 ≤ 12mm. When the diameter of the gas chamber 101 is larger than the above-mentioned range, on the one hand, it increases the volume of the gas chamber 101, prolonging the gas filling time and affecting riveting efficiency. On the other hand, it increases the size of the rivet gun, and during riveting operations, the rivet gun occupies a larger operating space, potentially interfering with other equipment on the production line. When the diameter of the gas chamber 101 is smaller than the above-mentioned range, the volume of the gas chamber 101 is smaller, and the amount of compressed air filled is less. During riveting operations, the pressure on the push rod 301 is prone to fluctuation, affecting the riveting quality. The value of Φ1 can be, for example, 8mm, 9mm, 10mm, 10.5mm, 11mm, 12mm, etc., but is not limited to these values.

[0024] In one embodiment, the outer diameter of the pin-pile tube 302 is Φ2, satisfying: 2mm ≤ Φ2 ≤ 6mm. The outer diameter of the pin-pile tube 302 being within this range improves riveting efficiency. If the diameter of the pin-pile tube 302 is larger than the above-mentioned range, the following effects occur: Firstly, the pin-pile tube 302 obstructs the end of the push rod 301 more, affecting the pushing effect of the compressed gas on the end of the push rod 301. Secondly, it also results in a smaller volume of the gas chamber 101, filling it with less compressed gas, leading to unstable gas pressure within the gas chamber 101 during riveting. Since the main function of the pin-pile tube 302 is to allow the broken pin shank after riveting to pass through the inside of the pin-pile tube 302 and exit from the tail end, if the diameter of the pin-pile tube 302 is smaller than the above-mentioned range, it will affect the sliding of the pin shank within the pin-pile tube 302, preventing rapid exit and potentially causing blockage of the pin-pile tube 302. The value of Φ2 can be, for example, 2mm, 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc., but is not limited to these values.

[0025] In one embodiment, the moving distance L of the push rod 301 satisfies: 0.5mm ≤ L ≤ 5mm. A moving distance within this range improves riveting efficiency. If the moving distance of the push rod 301 exceeds this design range, the time for the push rod 301 to reach its position (the clamping force reaching the preset value) is longer, and the opening speed of the grippers 2 is slower, affecting riveting efficiency. The value of L can be, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc., but is not limited to these values.

[0026] In one embodiment, the pushing surface 102 and the axial direction of the clamping sleeve 1 have an angle α, where 10° ≤ α ≤ 30°. For example, α can be designed to be 10°, 15°, 20°, 25°, 30°, etc., and is not limited to these angles. When specifically machining the clamping sleeve 1, a conical surface can be machined on the inner side of the end of the clamping sleeve 1, and this conical surface gradually increases in size from the front end to the rear end. The conical surface is adapted to the outer wall of the jaw 2, that is, the outer wall of the jaw 2 also has an angle with the axial direction. In the initial position, the jaw 2 is in an open state, allowing the nail rod to be inserted. As the clamping sleeve 1 gradually moves towards the rear end, the conical surface and the outer wall of the jaw 2 move relative to each other, and the clamping sleeve 1 drives the jaw 2 to retract inward, clamping the nail rod. The value of the angle α is within the above range, which allows the jaw 2 to retract faster and provides a greater pushing force from the pushing surface 102 on the jaw 2.

[0027] In one embodiment, the gripper 2 includes multiple claw plates 201, forming a clamping space for holding the rivet shank. Specifically, the gripper 2 may include three claw plates 201. The inner side of each claw plate 201 has multiple protruding ridges arranged along its length, i.e., the inner surface of each claw plate 201 is serrated to increase the friction between the claw plate 201 and the rivet shank. The side of each claw plate 201 facing the rivet gun opening has an inclined surface. When the gripper 2 retracts, the inclined surfaces of the three claw plates 201 form a recess that indents inwards from the gripper 2. When the tip of the rivet gun extends into the recess, it can separate the claw plates 201, thereby opening the gripper 2.

[0028] Continue to refer to Figure 4 In one embodiment, the rivet gun further includes a transmission mechanism 6. A clamping sleeve 1 is connected to the end of the transmission mechanism 6, which drives the clamping sleeve 1 to move axially. The transmission mechanism 6 can be a telescopic rod, a telescopic cylinder, a ball screw, a screw nut, or other similar mechanism.

[0029] In one specific embodiment, the transmission mechanism 6 may include a lead screw 601 and a lead screw nut 602 sleeved on the outer periphery of the lead screw 601, with the lead screw 601 rotatably connected to the lead screw nut 602. This transmission mechanism 6 can be driven by a drive device. The drive device may include a motor 100 and meshing transmission gears. The lead screw nut 602 is driven to rotate by the drive device, thereby enabling the lead screw 601 to move axially. A clamping sleeve 1 is sleeved on the outer periphery of the end of the lead screw 601. When the lead screw 601 moves from the front end to the rear end, or from the rear end to the front end, it can drive the clamping sleeve 1 to move along with it. The clamping sleeve 1 and the end of the lead screw 601 are connected by threads, facilitating later disassembly and maintenance. It is worth noting that the drive device is a common device in the prior art, and its specific structure will not be described in detail in this application.

[0030] like Figure 5 As shown, in one embodiment, the lead screw 601 is a hollow tubular structure, with the nail-pile tube 302 passing through it, and the end of the nail-pile tube 302 away from the nail rod protruding outside the lead screw 601. A first sealing element 7 is provided between the outer wall of the nail-pile tube 302 and the inner wall of the lead screw 601, and a second sealing element 8 is provided between the outer wall of the push rod 301 and the inner wall of the clamping sleeve 1. The end face of the push rod 301 facing the lead screw 601, the wall of the clamping sleeve 1, the wall of the nail-pile tube 302, and the end face of the lead screw 601 facing the nail rod 301 enclose a gas chamber 101. The first sealing element 7 and the second sealing element 8 can seal the gas chamber 101, reducing the possibility of gas leakage.

[0031] In some of the above embodiments, the push rod 301 can be made of the same material as the nail tube 302. In another embodiment, the push rod 301 can also be made of a flexible material, such as rubber. When the push rod 301 is made of a flexible material, the second sealing element 8 can be omitted. The push rod 301 fits tightly against the inner wall of the clamping sleeve, providing good sealing. The outer wall of the push rod 301 can also be coated with an oil film or other lubricating film to reduce the friction between the push rod 301 and the inner wall of the clamping sleeve.

[0032] Because the push rod 301 can move relative to the clamping sleeve 1, and the pin-pile assembly 302 can also move relative to the lead screw 601, air leakage may occur at the first seal 7 and the second seal 8 when the pressure in the gas chamber 101 is too high or when the pin-pile assembly 3 is moving. In one embodiment, the wall of the clamping sleeve 1 is provided with a vent hole, and an air pipe connector 10 is installed in the vent hole for connecting to an external air source. When the air pressure in the gas chamber 101 decreases due to air leakage, the gas chamber 101 can be inflated by the air source to adjust the pressure inside the gas chamber 101 and maintain the thrust on the push rod 301.

[0033] Connecting the gas chamber 101 to an external air source also has the following beneficial effects: First, the gas chamber 101 can be inflated by the air source to increase the pressure, thereby increasing the clamping force of the gripper 2. Second, by adjusting the pressure of the gas chamber 101, the push rod 301 can be moved into position quickly so that the clamping force of the gripper 2 can quickly reach the preset value.

[0034] In a further embodiment, the clamping sleeve 1 includes a pushing section 112 and an extension section 103, with the pushing section 112 and the extension section 103 threadedly connected. The pushing surface 102 is located in the pushing section, and the extension section 103 is a straight tube. Specifically, the extension section 103 includes a first end and a second end. The first end has an external thread, the pushing section 112 has an internal thread, and the first end is threadedly connected to the pushing section 112. The second end has an internal thread, the lead screw 601 has an external thread, and the second end is threadedly connected to the lead screw 601. The segmented design facilitates maintenance of the clamping sleeve 1. The end face of the push rod 301 facing the gas chamber 101 moves only within the range of the extension section 103. In some of the above embodiments, the second seal 8 is located between the inner wall of the extension section 103 and the outer wall of the push rod 301.

[0035] In one specific embodiment, the aforementioned vent is located in the extension section 103 of the clamping sleeve 1. The extension section 103, the push rod 301, and the lead screw 601 enclose and form the gas chamber 101. Since the pushing surface 102 is located in the pushing section 112, its machining difficulty is greater than that of the straight pipe of the extension section 103. Therefore, when the gas chamber 101 is damaged, only the extension section 103 needs to be replaced, saving machining costs.

[0036] like Figure 6 As shown, in one embodiment, the housing 4 is provided with a clearance hole 401, through which the air pipe connector 10 can extend to the outside of the housing 4. The clearance hole 401 is an elongated hole, and the air pipe connector 10 can slide along the axial direction of the housing 4 within the elongated hole. Specifically, the clearance hole 401 can be an oblong hole, a rectangular hole, an elliptical hole, etc.

[0037] It is worth noting that, within the allowable error range, the housing 4, clamping sleeve 1, gun head assembly 5, nail tube assembly 3, and lead screw 601 are coaxially arranged.

[0038] Because the lead screw 601 and the clamping sleeve 1 are detachably connected, air leakage may occur between the lead screw 601 and the clamping sleeve 1. In one embodiment, a third sealing element 9 may be provided between the outer wall of the lead screw 601 and the inner wall of the clamping sleeve 1, such as... Figure 5 The third seal 9 is located between the inner wall of the extension section 103 and the outer wall of the screw 601.

[0039] When selecting seals, sealing rings can be selected as the first seal 7, the second seal 8, and the third seal 9 mentioned above.

[0040] Continue to refer to Figure 4 To facilitate the direct discharge of the rivet shank from the tail end of the rivet gun and prevent broken rivet shanks from detaching from the nozzle after riveting and once the rivet gun is away from the workpiece, thus affecting workpiece processing, in one embodiment, the rivet gun further includes a suction mechanism 11. The suction mechanism 11 is connected to the end of the rivet tube 302 away from the top rod 301. The suction mechanism 11 provides negative pressure to the rivet tube 302, allowing the broken rivet shank to be suctioned and moved towards the tail end away from the gripper 2, and then discharged from the tail end.

[0041] Figure 8 A schematic diagram of the structure of a rivet gun provided for another embodiment of this application, as shown below. Figure 8 As shown, in one embodiment, the adsorption mechanism 11 is installed at the tail end of the rivet gun and includes a liquid storage chamber 111 and a negative pressure tube 112 that are in communication with each other. The end of the nail-pile tube 302 away from the push rod 301 is inserted into the liquid storage chamber 111 and is movable relative to the liquid storage chamber 111 along the axial direction of the nail-pile tube 302. The nail-pile tube 302 and the negative pressure tube 112 are spaced at a predetermined distance to prevent the nail-pile tube 302 from obstructing the gas flow between the negative pressure tube 112 and the liquid storage chamber 111.

[0042] During riveting, a small amount of electrolyte is drawn into the rivet gun. The electrolyte flows towards the tail end of the rivet gun through the nail-pile tube 302. Part of the electrolyte is drawn into the negative pressure tube 112 and directly discharged from the rivet gun, while some residual electrolyte flows into the storage chamber 111. The storage chamber 111 seals and contains the residual electrolyte, preventing it from flowing into other areas of the rivet gun and affecting other components. In addition, since the negative pressure tube 112 is connected to the storage chamber 111, and the nail-pile tube 302 is spaced at a preset distance from the negative pressure tube 112, the strong airflow formed in the negative pressure tube 112 can continue to discharge the residual electrolyte in the storage chamber 111, avoiding crystallization problems caused by long-term stagnation of electrolyte in the storage chamber 111.

[0043] Figure 9 This is a schematic diagram of the riveting mechanism and the adsorption mechanism provided in one embodiment of this application. Figure 10 This is a schematic diagram of the structure of the nail-packing tube assembly and the adsorption mechanism provided in one embodiment of this application. Figure 9 and Figure 10As shown, in one embodiment, the inner wall of the liquid storage chamber 111 has a first surface 1111 and a second surface 1112 connected to each other. The first surface 1111 is parallel to the nail-pile tube 302, and the second surface 1112 forms an angle with the nail-pile tube 302. That is, the first surface 1111 is a cylindrical surface, and the second surface 1112 is a frustum. The second surface 1112 has a first edge and a second edge. The first edge is connected to the negative pressure tube 112, and the second edge is connected to the first surface 1111. The diameter of the second edge is larger than the diameter of the first edge. The second surface 1112 gradually decreases in size from the front end to the rear end, so that when the electrolyte in the liquid storage chamber 111 is adsorbed, it flows more smoothly from the sloped second surface 1112 into the negative pressure tube 112, reducing dead corners in the liquid storage chamber 111 and thus reducing the possibility of electrolyte residue in the liquid storage chamber 111.

[0044] In one specific embodiment, the angle between the second surface 1112 and the nail tube 302 is in the range of 115°-120°.

[0045] Along the direction perpendicular to the pin-pile tube 302, the pin-pile tube 302 at least partially overlaps with the vertical projection of the first surface 1111.

[0046] In one embodiment, the adsorption mechanism 110 includes a body 1101 with an opening at one end facing the nail-pile tube 302, referred to as the first opening 1102. The nail-pile tube 302 is inserted into the liquid storage chamber 111 through the first opening 1102. A fourth sealing element 1103 is provided on the inner wall of the first opening 1102 and the outer wall of the nail-pile tube 302 to seal the gap between the nail-pile tube 302 and the first opening 1102. In this embodiment, the liquid storage chamber 111 is a one-piece molded structure, and the opening at the end of the body 1101 facing the nail-pile tube 302 is relatively small, with the diameter of the opening being approximately the same as the diameter of the nail-pile tube 302. Providing only one fourth sealing element 1103 ensures good sealing of the liquid storage chamber 111.

[0047] Since the pin-pile tube 302 can move relative to the liquid storage chamber 111 during riveting and pin removal, to prevent liquid droplets from entering between the fourth seal 1103 and the pin-pile tube 302 during movement, in one embodiment, an oil film may be provided between the fourth seal 1103 and the pin-pile tube 302 to improve sealing and reduce friction between them.

[0048] Figure 11 A schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided in one embodiment of this application is shown below. Figure 11As shown, in the above embodiment, the opening of the liquid storage chamber 111 is relatively small, which is not conducive to the assembly and cleaning of the interior of the liquid storage chamber 111. In another embodiment, the adsorption mechanism 110 may further include a plunger 1104. The body 1101 has an opening at one end facing the nail-pile tube 302, which is called the second opening 1105. The diameter of the second opening 1105 is the inner diameter of the liquid storage chamber 111, and the plunger 1104 is used to seal the second opening 1105. The second opening 1105 is larger than the first opening 1102 in the above embodiment, and the plunger 1104 is detachably installed in the second opening 1105, which facilitates the cleaning of the interior of the liquid storage chamber 111. The plunger 1104 has a through hole through which the nail-pile tube 302 passes. To prevent electrolyte from flowing out between the pin pack tube 302 and the plunger 1104, a fourth seal 1103 is installed between the inner wall of the through hole and the outer wall of the pin pack tube 302 to seal the gap between the pin pack tube 302 and the plunger 1104.

[0049] Continue to refer to Figure 11 In one embodiment, the adsorption mechanism 110 further includes at least one fifth sealing element 1106, which is installed between the plunger 1104 and the body 1101 to seal the gap between the plunger 1104 and the body 1101. The number of fifth sealing elements 1106 can be two, three, etc., and this application does not impose a specific limitation, in order to improve the sealing effect between the plunger 1104 and the body 1101.

[0050] The fourth seal 1103 and the fifth seal 1106 can be sealing rings.

[0051] In a further embodiment, a boss 11041 may be provided on the outer periphery of the plunger 1104 away from the negative pressure pipe 112. The boss 11041 abuts against the end face of the body 1101 facing the front end of the rivet gun, which can improve the sealing effect. At the same time, the boss 11041 can extend the flow path of the electrolyte, and it is only possible for the electrolyte to flow out of the storage chamber 111 after a large amount of electrolyte has accumulated in the storage chamber 111, thus increasing the difficulty for the electrolyte to flow out of the storage chamber 111.

[0052] When using a rivet gun to rivet the electrolyte injection hole, a common arrangement is to have the nozzle facing the battery cell below the rivet gun, meaning the adsorption mechanism 110 is positioned above the rivet mechanism. In this arrangement, the surface of the plunger 1104 facing the negative pressure tube 112 serves as the bottom wall of the electrolyte storage chamber 111. When there is a large amount of electrolyte in the storage chamber 111, droplets will collect on the plunger 1104 under gravity and may flow into the gap between the plunger 1104 and the pin-mounting tube 302, contacting the fourth seal 1103. This can cause corrosion of the fourth seal 1103.

[0053] To reduce corrosion of the fourth seal 1103, in one embodiment, the inner wall of the liquid storage chamber 111 may also be provided with a liquid storage tank 1107, which is located at the end of the first surface 111 near the negative pressure pipe 112. When the electrolyte enters the liquid storage chamber 111 from the pin-pile pipe 302, it usually splashes into the liquid storage chamber 111 in the form of droplets due to the airflow adsorption of the adsorption mechanism 110. Since the opening of the pin-pile pipe 302 is close to the opening of the negative pressure pipe 112, providing a liquid storage tank 1107 at the end of the liquid storage chamber 111 near the negative pressure pipe 112 helps to collect the droplets splashed out of the pin-pile pipe 302, thereby reducing the amount of electrolyte falling into the bottom of the liquid storage chamber 111.

[0054] Figure 12 A schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided for another embodiment of this application is shown below. Figure 12 As shown, in a further embodiment, the liquid storage tank 1107 is inclined toward the negative pressure pipe 112. The liquid storage tank 1107 includes a first side wall 11071, a second side wall 11072, and a bottom wall 11073. The first side wall 11071 and the second side wall 11072 are arranged opposite to each other and are respectively connected to the bottom wall 11073. The first side wall 11071 is connected to the second surface 1112 and is in the same plane. During riveting, a small amount of liquid droplets splash into the liquid storage tank 1107. Because the liquid storage tank 1107 is inclined, the droplets in the liquid storage tank 1107 flow toward the bottom wall 11073 under the action of gravity and are not easy to flow out of the liquid storage tank 1107 and fall onto the plunger 1104. Furthermore, the liquid storage tank 1107 is inclined toward the negative pressure pipe 112, and the first side wall 11071 is connected to the second surface 1112 and is on the same plane, which is conducive to the liquid droplets being sucked into the negative pressure pipe 112 and discharged.

[0055] Figure 13 A schematic diagram of the structure of the nail-laying tube and the adsorption mechanism provided for another embodiment of this application is shown below. Figure 13 As shown, in a further embodiment, the first surface 111 may be provided with a plurality of liquid storage tanks 1107, which are arranged at intervals along the axial direction of the liquid storage cavity 111. The plurality of liquid storage tanks 1107 can store more droplets, reducing the occurrence of droplets falling onto the surface of the plunger 1104.

[0056] The rivet gun of this application can be used to seal the electrolyte injection holes of battery cells. During battery cell manufacturing, the cell assembly is first placed inside the battery casing, then the battery cover assembly is fitted onto the battery casing. Electrolyte is then injected into the cavity formed by the battery cover assembly and the battery casing through the electrolyte injection hole on the battery cover assembly. A pop rivet is then inserted into the injection hole, and after riveting, the electrolyte injection hole on the battery cover assembly is sealed. Using the rivet gun of this application provides reliable riveting quality and high riveting efficiency. The electrolyte drawn into the rivet gun during riveting can be collected and discharged promptly, preventing damage to the components inside the rivet gun and improving its service life.

[0057] In some embodiments of this application, a riveting test is performed on a sample of the rivet gun. The air chamber inner diameter Φ1, the rivet bar outer diameter Φ2, and the push rod stroke L of the rivet gun sample and the comparative example rivet gun sample are selected from the data in Table 1. The specifications of other components are the same (not shown in Table 1). The riveting test can be performed according to the following steps: A riveting test was conducted on the above-mentioned rivet gun samples. With the push rod 301 and the clamp 2 in their initial state, i.e., away from the gun head assembly 5, a continuous air pressure of 2500 Pa was applied to the gas chamber 101 via an air source. The displacement time S of the push rod 301 pushing the clamp 2 from the initial state to the position abutting against the gun head assembly 5 was recorded. If S > 1.5 seconds, it was considered a failure.

[0058] During the above test, when the push rod 301 pushes the clamp 2 to abut against the gun head assembly 5, the clamp 2 opens. At this time, the rivet is placed into the clamp 2, and the drive device provides a 500N pulling force to the rivet gun to rivet the rivet. The final state of the rivet is observed to see if there are any defects such as skewness, cracks, or failure to break.

[0059]

[0060] Table 1 compares the test data of the rivet gun sample from one embodiment of this application with those from the comparative example.

[0061] As can be seen from Table 1, in some embodiments of the rivet gun samples of this application, such as in Embodiments 1 to 15, 0.6≤ ≤30, under the same air pressure, the top rod 301 can quickly drive the clamp 2 to move into place within a specified time. The clamp 2 opens quickly, meeting the design requirements. During the riveting process, the stroke is stable, and the rivet head is flat and without abnormalities after riveting.

[0062] In Examples 16-32, 0.6≤ ≤30, under the same air pressure, the push rod 301 can also quickly reach its position, and the riveting of the rivets meets the requirements, but other problems exist in the process: When the inner diameter Φ1 of the gas chamber 101 is large, the volume of the gas chamber 101 is large. On the one hand, this prolongs the gas filling time and affects the riveting efficiency. On the other hand, it makes the overall size of the riveting gun larger, occupying more operating space during riveting and easily causing interference with other equipment. When the inner diameter Φ1 of the gas chamber 101 is small, the volume of the gas chamber 101 is smaller, the space for compressed gas is smaller, and the pressure on the push rod 301 fluctuates during riveting.

[0063] When the outer diameter Φ2 of the pin-pile tube 302 is large, the area at the connection between the pin-pile tube 302 and the push rod 301 is small, which affects the pushing pressure of the compressed gas on the end of the push rod 301. When the outer diameter Φ2 of the pin-pile tube 302 is small, it affects the discharge of the rivets after riveting from inside the pin-pile tube 302.

[0064] When the stroke L of the push rod 301 is large, the time it takes for the push rod 301 to reach its final position is long, and the gripper 2 opens slowly, affecting processing efficiency. When the stroke L of the push rod 301 is small, if the gripper 2 needs to open and place the nail rod after being pushed into position, the length of the gripper 2 needs to be reduced, which affects the clamping area of ​​the nail rod and leads to a decrease in the clamping stability of the gripper 2 on the nail rod.

[0065] Comparative rivet gun samples, such as Comparative Examples 1-6. <0.6. Under the same test conditions, the push rod 301 can quickly move the clamp 2 into position within a specified time, and the clamp 2 opens quickly, meeting the design requirements. However, the amount of compressed gas in the gas chamber 101 is small, and the pressure is unstable during the riveting process, which leads to unstable pressure of the push rod 301 against the clamp 2, resulting in riveting failure. The rivet is skewed after riveting, and some rivet rods are not broken.

[0066] Comparative Examples 7-12, >30, under the same test conditions, the push rod 301 takes longer to push into place, and the gripper 2 opens into place more slowly, which affects the processing efficiency.

[0067] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A rivet gun, characterized in that, include: A clamping sleeve, grippers, and a nail-pile assembly, wherein the nail-pile assembly is disposed within the clamping sleeve. The gripper is disposed inside the clamping sleeve, and the end of the clamping sleeve has a pushing surface facing the gripper. The nail tube assembly includes a push rod and a nail tube. The push rod is fixedly connected to the end of the nail tube, and the gripper is located between the pushing surface and the push rod. The clamping sleeve has a gas chamber located on the side of the push rod away from the jaws, and the gas chamber is filled with compressed gas, which is used to provide a thrust to the push rod toward the jaws; The clamping sleeve has a vent hole on its wall, which communicates with the gas chamber. The vent hole is used to connect to a gas source, which is used to regulate the pressure inside the gas chamber. The clamping sleeve includes a pushing section and an extension section connected to each other. The pushing surface is located in the pushing section, and the vent hole is located in the extension section. When the clamping sleeve moves to the tail end, under the action of air pressure, the push rod drives the jaws to fit tightly against the pushing surface, and the pushing surface pushes against the outer periphery of the jaws so that the jaws clamp the nail rod; The diameter Φ1 of the gas chamber, the moving distance L of the push rod, and the outer diameter Φ2 of the nail-pile tube satisfy the following: .

2. The rivet gun according to claim 1, characterized in that, The compressed gas is air, nitrogen, or an inert gas.

3. The rivet gun according to claim 1, characterized in that, The diameter Φ1 of the gas chamber satisfies: 8mm≤Φ1≤12mm.

4. The rivet gun according to claim 1, characterized in that, The outer diameter of the nail tube is Φ2, which satisfies the condition: 2mm≤Φ2≤6mm.

5. The rivet gun according to claim 1, characterized in that, The moving distance L of the top rod satisfies: 0.5 mm ≤ L ≤ 5 mm.

6. The rivet gun according to claim 1, characterized in that, The pushing surface and the axial direction of the clamping sleeve have an angle α, which satisfies: 10°≤α≤30°.

7. The rivet gun according to claim 1, characterized in that, It also includes a transmission mechanism, the clamping sleeve being connected to the end of the transmission mechanism, the transmission mechanism being used to drive the clamping sleeve to move along its axial direction.

8. The rivet gun according to claim 7, characterized in that, The transmission mechanism is a telescopic rod mechanism, a telescopic cylinder mechanism, or a ball screw mechanism.

9. The rivet gun according to claim 7, characterized in that, The transmission mechanism includes a lead screw, which is a hollow structure. The nail-pile tube passes through the lead screw. A first sealing element is provided between the outer wall of the nail-pile tube and the inner wall of the lead screw. A second sealing element is provided between the outer wall of the top rod and the inner wall of the clamping sleeve. The nail-pile tube assembly, the wall of the clamping sleeve, and the lead screw together form the gas chamber.

10. The rivet gun according to claim 9, characterized in that, The extension section has an external thread, the push section has an internal thread, the push section is threadedly connected to the extension section, the second seal is located between the inner wall of the extension section and the outer wall of the push rod, and the end face of the push rod toward the gas chamber moves within the length range of the extension section.

11. The rivet gun according to claim 7, characterized in that, The transmission mechanism includes a lead screw with a hollow structure. The nail-pile tube passes through the lead screw, and a first sealing element is provided between the outer wall of the nail-pile tube and the inner wall of the lead screw. The top rod is made of a flexible material. The nail-pile tube assembly, the cylinder wall of the clamping sleeve, and the lead screw together form the gas chamber.

12. The rivet gun according to claim 9 or 11, characterized in that, A third sealing element is provided between the outer wall of the lead screw and the inner wall of the clamping sleeve. The lead screw is threadedly connected to the extension section, and the third sealing element is located between the inner wall of the extension section and the outer wall of the lead screw.

13. The rivet gun according to claim 1, characterized in that, It also includes a housing, the clamping sleeve and the gripper are disposed inside the housing, the clamping sleeve is movable relative to the housing, the housing is provided with a clearance hole, the vent hole is provided with an air pipe connector, and the air pipe connector extends outward from the housing through the clearance hole.

14. The rivet gun according to claim 13, characterized in that, The clearance hole is an elongated hole, and the air pipe connector can slide along the axial direction of the clamping sleeve within the elongated hole.

15. The rivet gun according to claim 14, characterized in that, The clearance hole can be a waist-shaped hole, a rectangular hole, or an oval hole.

16. The rivet gun according to claim 13, characterized in that, It also includes a gun head assembly, which is installed at the opening of the housing. The gun head assembly has a tip facing the gripper, and the end of the gripper facing the gun head assembly has a recess. The tip is used to extend into the recess to open the gripper.

17. The rivet gun according to claim 1, characterized in that, At least a portion of the grippers can extend outside the clamping sleeve.

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