Riveting gun, riveting control system and riveting control method

Abstract

The invention discloses a hand riveter, a rivet pulling control system and a rivet pulling control method, the clamping force on rivets is stable, control parameters can be adjusted in a self-adaptive mode, manual continuous value modification is omitted, and the pre-tightening tension is more accurate. 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.

Description

Technical Field

[0001] The present application relates to the technical field of battery processing equipment, and in particular to a rivet gun, a rivet control system, and a rivet control method. Background Art

[0002] A rivet gun is a tool used to install blind rivets. It is widely used in metal processing, automobile manufacturing, battery processing, aerospace and other fields. It can replace welding processes and effectively solve the problem of plate penetration. The rivet gun includes a rivet mechanism for transmitting tension to pull the rivet rod outward. During long-term use, the spring in the rivet mechanism will reduce the clamping force of the rivet gun due to fatigue, resulting in unqualified rivets being broken and the processed products being scrapped. Therefore, the rivet gun needs to frequently replace the spring during maintenance, which not only affects production efficiency, but also poses a risk to product quality. In addition, due to individual differences in rivets or wear of the clamping jaws at the rivet entry, the rivet may be deformed but not broken, or the rivet may not be tightened. This requires manual adjustment of the preset tension value, which is cumbersome. Summary of the Invention

[0003] The rivet gun, rivet control system, and rivet control method provided by this application reduce the reduction in clamping force and instability of the rivet gun. Furthermore, the control parameters can be adaptively adjusted, eliminating the need for manual value modification and providing more precise preload tension for the rivet gun.

[0004] The present application provides a rivet gun comprising a clamping sleeve, a clamping jaw, a tension detection unit, a nail tube assembly and a driving mechanism, wherein the nail tube assembly is arranged in the clamping sleeve, the tension detection unit is used to detect the tension of the clamping sleeve, the driving mechanism comprises a motor, and the motor is used to drive the clamping sleeve to move along the axial direction of the clamping sleeve, wherein the clamping jaw is arranged in the clamping sleeve, the end of the clamping sleeve has a push surface facing the clamping jaw, the nail tube assembly comprises a push rod and a nail tube, the push rod The rod is fixedly connected to the end of the nail row tube, and the clamping jaw is located between the pushing surface and the push rod; the clamping sleeve has a gas chamber, and the gas chamber is located on the side of the push rod away from the clamping jaw, and the gas chamber is filled with compressed gas, and the compressed gas is used to provide the push rod with a thrust toward the clamping jaw; when the clamping sleeve moves toward the tail end, the push rod drives the clamping jaw to fit tightly with the pushing surface under the action of air pressure, and the pushing surface pushes the outer periphery of the clamping jaw so that the clamping jaw clamps the nail rod.

[0005] In the above embodiment, the clamping sleeve, the clamping jaws and the nail tube assembly constitute the riveting mechanism of the rivet gun. When riveting, the clamping sleeve applies a positive pulling force to the clamping jaws, causing the clamping jaws to retract. The nail tube assembly is subjected to a bidirectional thrust and moves in the clamping sleeve. Its principle is similar to the tube body of a syringe and the movable plunger structure that slides in the tube body. The movement of the movable plunger can adjust the air pressure in the tube body. The compressed gas applies a reverse thrust toward the clamping jaws on the push rod, which can keep the clamping jaws in contact with the push surface at all times. Compared with using a spring to provide a reverse thrust, using a gas chamber to use air pressure as a reverse thrust on the clamping jaws can make the clamping force of the clamping jaws more reliable and will not cause the clamping force to decrease due to spring fatigue. The tension detection unit can detect the tension of the clamping sleeve. The tension detection unit is electrically connected to the control system and can send the detected tension to the control system in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural diagram of a blind rivet in the related art; Figure 2 This is a state change diagram of a blind rivet during riveting in the related art; Figure 3 It is a structural diagram of a rivet gun in the related art; Figure 4 A schematic structural diagram of a rivet gun provided in one embodiment of the present application; Figure 5 A cross-sectional view of a riveting mechanism and a transmission mechanism provided in one embodiment of the present application; Figure 6 An assembly diagram of a riveting mechanism and a transmission mechanism provided in accordance with an embodiment of the present application; Figure 7 An exploded view of a riveting mechanism and a transmission mechanism provided in one embodiment of the present application; Figure 8 A schematic structural diagram of a rivet gun provided in another embodiment of the present application; Figure 9 A schematic structural diagram of a riveting mechanism and an adsorption mechanism provided in one embodiment of the present application; Figure 10 A schematic structural diagram of a nail strip tube assembly and an adsorption mechanism provided in one embodiment of the present application; Figure 11 A schematic structural diagram of a nail stripping tube and an adsorption mechanism provided in one embodiment of the present application; Figure 12 A schematic structural diagram of a nail stripping tube and an adsorption mechanism provided in another embodiment of the present application; Figure 13 A schematic structural diagram of a nail stripping tube and an adsorption mechanism provided in another embodiment of the present application.

[0007] Related technical reference numerals: 01-core rod; 02-nail body; 011-nail rod; 012-head; 013-fracture groove; 021-nail cap; 022-sleeve; 023-expansion section; 00-rivet gun; 001-claw; 002-sleeve; 003-thrust rod assembly; 004-spring; 005-spring sleeve; 0031-head; 0032-thrust rod; 000-cover plate assembly; 006-adsorption mechanism; 0061-negative pressure tube.

[0008] Figure numerals of the embodiments of this application: 1-clamping sleeve; 2-clamping claw; 3-nail strip tube assembly; 301-elevator; 302-nail strip tube; 101-gas chamber; 102-thrust surface; 4-housing; 5-gun head assembly; 501-tip; 201-claw; 6-transmission mechanism; 601 screw; 602-screw nut; 100-motor; 7-first seal; 8-second seal; 9-third seal; 112-thrust section; 103-extension section; 10-trachea joint; 401-avoidance hole; 11 -adsorption mechanism; 111-liquid storage chamber; 112-negative pressure tube; 1111-first surface; 1112-second surface; 1101-main body; 1102-first opening; 1103-fourth sealing member; 1104-plunger; 1105-second opening; 1106-fifth sealing member; 11041-boss; 1107-liquid storage tank; 11071-first side wall; 11072-second side wall; 11073-bottom wall of the tank; 12-pressure sensor; 13-pressure sleeve. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solutions and advantages of this application clearer, the present application is further described in detail with reference to the accompanying drawings.

[0010] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the", and "this" are intended to also include expressions such as "one or more", unless the context clearly indicates otherwise.

[0011] References in this specification to "one embodiment" or "a specific embodiment" mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. The terms "including," "comprising," "having," and their variations all mean "including but not limited to," unless otherwise specifically stated.

[0012] The battery cell mainly includes a shell that encloses a receiving cavity, a battery cover assembly, a cell assembly arranged in the receiving cavity, and an electrolyte filled in the receiving cavity through the injection hole on the battery cover assembly. In some related technologies, after the battery cell is injected, a sealing nail is usually used to seal the injection hole. The sealing nail is connected to the cover assembly by laser welding. However, the equipment for laser welding is expensive, which increases the production cost of the battery cell, and the welding positioning requirements are high. It is very easy to have welding deviation, welding leakage and other phenomena, which makes the assembly of the sealing nail difficult and affects the yield of the battery cell.

[0013] Using blind rivets instead of welded sealing nails to plug the injection hole improves assembly efficiency and increases the yield rate of battery cells. During battery cell production, the cell assembly is first placed in the battery casing. The battery cover assembly is then assembled with the battery casing. The electrolyte is then injected into the cavity formed by the battery cover assembly and the battery casing through the injection hole in the battery cover assembly. A blind rivet is then inserted into the injection hole and riveted with a rivet gun. This causes the rivet body to deform within the injection hole, resulting in an interference fit.

[0014] Blind rivets are a type of fastener that is installed on one side and is suitable for use in situations where it is not possible to operate from the back. Figure 1 It is a structural diagram of a blind rivet in the related art, such as Figure 1 As shown, the blind rivet consists of two parts: a core rod 01 and a rivet body 02, and deformation and fixation are achieved through the tension of the rivet gun. The core rod 01 includes a head 012 and a rivet rod 011. The rivet rod 011 is a smooth or toothed metal rod used to transmit tension. The head 012 is located at the top of the rivet rod 011 and is usually a spherical or flat structure. A fracture groove 013 is provided on the rivet rod 011 near the head 012, and the fracture groove 013 is an annular groove. The rivet body 02 is sleeved on the outside of the core rod 01, and the rivet body 02 includes a nail cap 021, a sleeve 022 and an expansion section 023. The nail cap 021 and the expansion section 023 are respectively located at the two ends of the sleeve 022. Figure 2 This is a state change diagram of the cover plate assembly and the blind rivet during riveting in the related art, such as Figure 2 As shown, during riveting, the rivet gun 00's tip presses the nut 021 against the side of the liquid injection hole in the cover plate assembly 000 and pulls the end of the shank 011 away from the head 012. The head 012 deforms the expansion section 023 of the shank 02 and causes it to curl inward. When the pulling force reaches a predetermined value, the shank 011 breaks at the fracture groove 013, securing the shank 02 and the head 012 to the cover plate assembly 000.

[0015] Figure 3 It is a structural diagram of a rivet gun in the related art, such as Figure 3As shown in some related art, a rivet gun typically includes a jaw 001, a sleeve 002, a push rod assembly 003, a spring 004, a spring sleeve 005, and an adsorption mechanism 006. The jaw 001 is positioned within the sleeve 002. The push rod assembly 003 is located on the side of the jaw 001 facing away from the muzzle of the rivet gun. This push rod assembly 003 comprises a plug 0031 and a push rod 0032 positioned at the rear end of the plug 0031. A spring 004 is sheathed around the outer wall of the push rod 0032, which is then surrounded by a spring sleeve 005. The spring 004 exerts its elastic force on the push rod 0032, tightening the jaw 001. During riveting, the shank extends between the jaw and the shank. Sleeve 002 drives claw 001 backward. Guided by the inner conical surface of sleeve 002, claw 001 automatically tightens and clamps the nail rod. As the pulling force continues to increase and reaches a preset value, the nail rod is broken, and the broken nail rod remains in the ejector pin. An adsorption mechanism 006 is installed at the tail end of the rivet gun. Adsorption mechanism 006 includes a negative pressure tube 0061. The end of ejector pin 0032, away from the ejector head 0031, is inserted into negative pressure tube 0061. Both ejector pin 0032 and negative pressure tube 0061 are hollow structures. Once the nail rod is broken, it is absorbed by adsorption mechanism 006 and discharged from the tail end of the rivet gun through ejector pin 0032 and negative pressure tube 0061.

[0016] The strength design of the fracture groove 013 of the nail rod 011 needs to match the tension of the rivet gun. Since the spring 004 of the rivet gun will become fatigued after being used for a period of time, the preload force of the spring 004 will decrease. This will prevent the push rod 0032 from pressing the claw 001, resulting in a decrease in the holding force of the claw 001. When riveting, the claw 001 is prone to slipping with the nail rod 011, causing the tension of the rivet gun to fail to reach the preset value, resulting in abnormal fracture of the fracture groove 013 of the core rod 01. In addition, due to the individual differences of rivets or the wear of the clamping jaws at the nail entry, when riveting, the rivet may be deformed but not broken, or the rivet may not be tightened. This requires manual adjustment of the preset value of the tension of the rivet gun, which is cumbersome.

[0017] In light of this, embodiments of the present application provide a rivet gun and rivet control method that mitigate the reduced clamping force and instability of the rivet gun. Furthermore, the method can adaptively adjust control parameters, eliminating the need for manual modification of preset tension values and providing more precise preload tension for the rivet gun. The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0018] Figure 4 A schematic diagram of the structure of a rivet gun provided in an embodiment of the present application is shown in FIG. Figure 4As shown, a rivet gun provided in an embodiment of the present application comprises: a clamping sleeve 1, a clamping jaw 2, a nail tube assembly 3 and a tension detection unit. The tension detection unit is used to detect the tension of the clamping sleeve 1. The nail tube assembly 3 is arranged in the clamping sleeve 1 and can move relative to the clamping sleeve 1. The clamping jaw 2 is also arranged in the clamping sleeve 1, and the end of the clamping sleeve 1 has a push surface 102 facing the clamping jaw 2. The outer wall of the clamping jaw 2 abuts against the push surface 102, and the clamping jaw 2 can slide along the push surface 102. The nail tube assembly 3 comprises a push rod 301 and a nail tube 302. The push rod 301 is fixedly connected to the end of the nail tube 302. The clamping jaw 2 is located between the push surface 102 and the push rod 301. The clamping jaw 2 and the push rod 301 are arranged in sequence along the axial direction of the clamping sleeve 1, and the push rod 301 abuts against the clamping jaw 2. The clamping sleeve 1 has a gas chamber 101, which is located on the side of the push rod 301 facing away from the clamping jaw 2. The gas chamber 101 is filled with compressed gas, which has pressure and always provides the push rod 301 with a thrust toward the clamping jaw 2.

[0019] As the clamping sleeve 1 moves toward the rear end of the rivet gun, the push surface 102 causes the jaws 2 to retract, causing the jaws 2 and the push rod 301 to move toward the rear end. Under the pressure of the compressed gas, the push rod 301 provides reverse thrust to the jaws 2, forcing them to fit tightly against the push surface 102. The push surface 102 pushes against the outer periphery of the jaws 2, causing them to clamp the nail shank. As the push rod 301 moves, the thrust on the jaws 2 gradually increases until the gripping force of the jaws 2 on the nail shank reaches a preset value, at which point the clamping sleeve 1 stops moving.

[0020] In the above embodiment, the clamping sleeve 1, the jaws 2, and the nail tube 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 the jaws 2 to retract. The nail tube assembly 3 is subjected to a bidirectional thrust and moves in the clamping sleeve 1. The principle is similar to that of a syringe tube and a movable plunger sliding within the tube. The movement of the movable plunger can adjust the air pressure within the tube. The compressed gas applies a reverse thrust toward the jaws 2 to the push rod 301, which can ensure that the jaws 2 always remain in contact with the push surface 102. Compared with using a spring to provide reverse thrust, using the gas chamber 101 to use air pressure as a reverse thrust on the jaws 2 can make the clamping force of the jaws 2 more reliable and prevent the clamping force from decreasing due to spring fatigue. The tension detection unit can detect the tension of the clamping sleeve. The tension detection unit is electrically connected to an external control system and can promptly send the detected tension to the control system. The control system can adaptively adjust the control parameters, which not only saves the manual modification of the preset tension value but also makes the pre-tightening tension of the rivet gun more accurate.

[0021] The compressed gas may be, for example, air, nitrogen or an inert gas, which is relatively safe.

[0022] Figure 6An assembly diagram of a riveting mechanism and a transmission mechanism provided for an embodiment of the present application is provided. Figure 7 An exploded diagram of a riveting mechanism and a transmission mechanism provided in an embodiment of the present application, combined with Figures 5 to 7 In one embodiment, the rivet gun further includes a shell 4 and a gun head assembly 5, the gun head assembly 5 is installed at the opening of the shell 4, the clamping sleeve 1 and the jaw 2 are arranged in the shell 4, and at least part of the jaw 2 can extend out of the clamping sleeve 1. The clamping sleeve 1 can move axially relative to the shell 4. The gun head assembly 5 is a hollow structure and is provided with a tip 501 facing the jaw 2. The tip 501 abuts against the part of the jaw 2 extending out of the clamping sleeve 1 to open the jaw 2. A pit is provided at one end of the jaw 2 facing the gun head assembly 5. In the initial state of the rivet gun, the push rod 301 squeezes the jaw 2 so that the jaw 2 abuts against the tip 501 of the gun head assembly 5. The tip 501 opens the jaw 2 so that the nail rod can be inserted into the clamping space of the jaw 2.

[0023] Please continue to refer to Figure 5 In one embodiment, the tension detection unit may include a pressure sleeve 13 and a pressure sensor 12. The pressure sleeve 13 is disposed between the pressure sensor 12 and the housing 4 and abuts against the housing 4. The pressure sleeve 13 can contact the pressure sensor 12. After the rivet is tightened by the riveting mechanism, the gun head assembly 5 abuts against the battery cell. In this way, when the battery cell is subjected to the rivet tension, it will also react to the gun head assembly 5, thereby applying a thrust to the housing 4. The thrust is the same as the tension. When the housing 4 is pushed, it will squeeze the pressure sleeve 13. The pressure sleeve 13 will transmit the thrust to the pressure sensor 12, and then the pressure sensor 12 detects the magnitude of the thrust. Since the thrust is the same as the tension, the pressure sensor 12 can detect the tension, so that the movement of the riveting mechanism can be controlled according to the tension to prevent the tension from being too low or too high, thereby improving the quality of the single battery and the qualified rate of the product.

[0024] In one embodiment, the above-mentioned clamping jaw 2 includes a plurality of claw pieces 201, and a clamping space for clamping the nail rod is formed between the plurality of claw pieces 201. Specifically, the clamping jaw 2 may include three claw pieces 201. The inner side of the claw piece 201 is provided with a plurality of ridges arranged along the length direction of the claw piece 201, that is, the inner surface of the claw piece 201 is serrated to increase the friction between the claw piece 201 and the nail rod. The claw piece 201 has an inclined surface on the side facing the opening of the rivet gun. When the clamping jaw 2 is retracted, the inclined surfaces of the three claw pieces 201 form a pit that is recessed toward the inner side of the clamping jaw 2. When the tip of the gun head extends into the pit, the claw piece 201 can be separated, thereby opening the clamping jaw 2.

[0025] Continue to refer Figure 4In one embodiment, the rivet gun further includes a transmission mechanism 6. The clamping sleeve 1 is connected to the end of the transmission mechanism 6, and the transmission mechanism 6 is used to drive the clamping sleeve 1 to move along its axial direction. The transmission mechanism 6 can be a telescopic rod, a telescopic cylinder, a ball screw, a screw nut, or the like.

[0026] In a specific embodiment, the transmission mechanism 6 may include a screw rod 601 and a screw nut 602 sleeved on the outer periphery of the screw rod 601, and the screw rod 601 is rotatably connected to the screw nut 602. The transmission mechanism 6 can be driven by a driving device. The driving device may include a motor 100 and mutually meshing transmission gears. The screw nut 602 is driven to rotate by the driving device, thereby enabling the screw rod 601 to move along its axial direction. The clamping sleeve 1 is sleeved on the outer periphery of the end of the screw rod 601, and when the screw rod 601 moves from the front end to the tail end, or from the tail end to the front end, it can drive the clamping sleeve 1 to move therewith. The clamping sleeve 1 is threadedly connected to the end of the screw rod 601, which is convenient for later disassembly and maintenance. It is worth noting that the driving device is a common device in the prior art, and its specific structure will not be repeated in this application.

[0027] like Figure 5 As shown, in one embodiment, the screw rod 601 is a hollow tubular structure, the nail stripping tube 302 is inserted into the screw rod 601, and the end of the nail stripping tube 302 away from the nail rod passes out of the screw rod 601. A first seal 7 is provided between the outer wall of the nail stripping tube 302 and the inner wall of the screw rod 601, and a second seal 8 is provided between the outer wall of the push rod 301 and the inner wall of the clamping sleeve 1. The end surface of the push rod 301 facing the screw rod 601, the tube wall of the clamping sleeve 1, the tube wall of the nail stripping tube 302 and the end surface of the screw rod 601 facing the nail rod 301 enclose a gas chamber 101. The first seal 7 and the second seal 8 can seal the gas chamber 101 to reduce gas leakage.

[0028] In some of the above-mentioned embodiments, the push rod 301 can be made of the same material as the nail strip 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 member 8 can be omitted. The push rod 301 fits tightly against the inner wall of the clamping sleeve, providing a good seal. The outer wall of the push rod 301 can also be coated with an oil film or other lubricating film to reduce friction between the push rod 301 and the inner wall of the clamping sleeve.

[0029] Since the push rod 301 can move relative to the clamping sleeve 1, and the nail strip tube 302 can also move relative to the screw rod 601. When the pressure in the gas chamber 101 is too high or the nail strip tube assembly 3 is moving, there may be air leakage at the first seal 7 and the second seal 8. In one embodiment, the cylinder wall of the clamping sleeve 1 is provided with an air vent, and the air vent is installed with an air pipe connector 10, which is used to connect to an external air source. When the air pressure in the gas chamber 101 is reduced due to air leakage, the gas chamber 101 can be inflated by the air source to adjust the pressure in the gas chamber 101 and maintain the thrust on the push rod 301.

[0030] Connecting the gas chamber 101 to an external gas source also has the following beneficial effects: First, the gas source can be used to inflate the gas chamber 101 to increase the pressure, thereby increasing the gripping force of the jaws 2. Second, by adjusting the pressure in the gas chamber 101, the ejector pin 301 can be quickly moved into position, allowing the gripping force of the jaws 2 to quickly reach a preset value.

[0031] In a further embodiment, the clamping sleeve 1 includes a push section 112 and an extension section 103, and the push section 112 is threadedly connected to the extension section 103. The push surface 102 is located in the push section, and the extension section 103 is a straight tube. Specifically, the extension section 103 includes a first end and a second end. Among them, the first end is provided with an external thread, the push section 112 is provided with an internal thread, and the first end is threadedly connected to the push section 112. The second end is provided with an internal thread, the screw rod 601 is provided with an external thread, and the second end is threadedly connected to the screw rod 601. The segmented design facilitates maintenance of the clamping sleeve 1. The end face of the push rod 301 facing the gas chamber 101 only moves within the range of the extension section 103. The second sealing member 8 in some of the above embodiments is located between the inner wall of the extension section 103 and the outer wall of the push rod 301.

[0032] In one specific embodiment, the vent is located in the extension section 103 of the clamping sleeve 1. The extension section 103, the push rod 301, and the screw 601 together form the gas chamber 101. Because the push surface 102 is located in the push section 112, machining is more difficult than with a straight tube in the extension section 103. Therefore, if the gas chamber 101 is damaged, only the extension section 103 needs to be replaced, saving machining costs.

[0033] like Figure 6 As shown, in one embodiment, the housing 4 is provided with a relief hole 401, through which the trachea connector 10 can extend to the exterior of the housing 4. The relief hole 401 is an elongated hole, within which the trachea connector 10 can slide axially along the housing 4. Specifically, the relief hole 401 can be a waist-shaped hole, a rectangular hole, an elliptical hole, or the like.

[0034] It is worth noting that, within the allowable error range, the housing 4 , the clamping sleeve 1 , the gun head assembly 5 , the nail strip tube assembly 3 , and the screw rod 601 are coaxially arranged.

[0035] Since the screw rod 601 is detachably connected to the clamping sleeve 1, there may be air leakage between the screw rod 601 and the clamping sleeve 1. In one embodiment, a third sealing member 9 may be provided between the outer wall of the screw rod 601 and the inner wall of the clamping sleeve 1. Figure 5 The third sealing member 9 is located between the inner wall of the extension section 103 and the outer wall of the screw rod 601 .

[0036] When selecting the sealing members, sealing rings may be selected as the first sealing member 7 , the second sealing member 8 and the third sealing member 9 .

[0037] Continue to refer Figure 4 To facilitate direct discharge of the nail rod from the rear end of the rivet gun, and to prevent broken nail rods from falling out of the front muzzle of the rivet gun after riveting is completed and the rivet gun is removed from the workpiece, thereby affecting workpiece processing, in one embodiment, the rivet gun further includes a suction mechanism 11, which is connected to the end of the nail dispensing tube 302 away from the ejector pin 301. The suction mechanism 11 is used to provide negative pressure to the nail dispensing tube 302, so that broken nail rods are attracted and moved toward the rear end, away from the clamping jaws 2, and then discharged from the rear end.

[0038] Figure 8 A schematic structural diagram of a rivet gun provided in another embodiment of the present application is shown in FIG. Figure 8 As shown, in one embodiment, the adsorption mechanism 11 is mounted at the rear end of the rivet gun and includes a fluid reservoir 111 and a negative pressure tube 112, which are interconnected. The end of the nail stripping tube 302, distal from the ejector rod 301, is inserted into the fluid reservoir 111 and is movable axially relative to the fluid reservoir 111. The nail stripping tube 302 is spaced a predetermined distance from the negative pressure tube 112 to prevent the nail stripping tube 302 from blocking the flow of gas between the negative pressure tube 112 and the fluid reservoir 111.

[0039] When riveting, a small amount of electrolyte will be sucked into the rivet gun. The electrolyte flows to the tail end of the rivet gun through the nail row tube 302. Part of the electrolyte is sucked into the negative pressure tube 112 and directly discharged from the rivet gun, and part of the residual electrolyte flows into the liquid storage chamber 111. The liquid storage chamber 111 seals and traps the residual electrolyte to prevent 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 liquid storage chamber 111, and the nail row tube 302 is separated from the negative pressure tube 112 by a preset distance, the strong airflow formed in the negative pressure tube 112 can continue to discharge the residual electrolyte in the liquid storage chamber 111, avoiding the crystallization problem caused by the electrolyte staying in the liquid storage chamber 111 for a long time.

[0040] Figure 9 This is a schematic diagram of the structure of the riveting mechanism and the adsorption mechanism provided in one embodiment of the present application. Figure 10This is a structural diagram of a nail strip tube assembly and an adsorption mechanism provided in one embodiment of the present application. Figure 9 and Figure 10 As shown, in one embodiment, the inner wall of the liquid storage chamber 111 has a first surface 1111 and a second surface 1112 that are interconnected. The first surface 1111 is parallel to the nail row tube 302, and the second surface 1112 is at an angle to the nail row tube 302. In other words, 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 from the front end to the rear end, so that the electrolyte in the liquid storage chamber 111 flows smoothly from the sloped second surface 1112 into the negative pressure tube 112 when being adsorbed, reducing dead corners in the liquid storage chamber 111 and reducing the amount of electrolyte remaining in the liquid storage chamber 111.

[0041] In a specific embodiment, the angle between the second surface 1112 and the nail arrangement tube 302 is in the range of 115°-120°.

[0042] Along a direction perpendicular to the nail row tube 302 , the nail row tube 302 at least partially overlaps with a vertical projection of the first surface 1111 .

[0043] In one embodiment, the adsorption mechanism 110 includes a main body 1101 having an opening at one end of the main body 1101 facing the nail row tube 302, which is referred to as a first opening 1102. The nail row tube 302 is inserted into the liquid storage chamber 111 through the first opening 1102. A fourth sealing member 1103 is provided between the inner wall of the first opening 1102 and the outer wall of the nail row tube 302 to seal the gap between the nail row tube 302 and the first opening 1102. In this embodiment, the liquid storage chamber 111 is an integrally molded structure, and the opening at the end of the main body 1101 facing the nail row tube 302 is smaller, with a diameter approximately equal to the diameter of the nail row tube 302. Providing only one fourth sealing member 1103 can improve the sealing performance of the liquid storage chamber 111.

[0044] Since the nail strip tube 302 can move relative to the liquid storage chamber 111 during riveting and unriveting, in order to prevent liquid droplets from entering between the fourth sealing member 1103 and the nail strip tube 302 when the nail strip tube 302 moves, in one embodiment, an oil film can be provided between the fourth sealing member 1103 and the nail strip tube 302 to improve sealing and reduce friction between the nail strip tube 302 and the fourth sealing member 1103.

[0045] Figure 11 A schematic diagram of the structure of the nail stripping tube and the adsorption mechanism provided in one embodiment of the present application is shown as follows: Figure 11As shown, in the above embodiment, the opening of the liquid storage chamber 111 is relatively small, which is not conducive to 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 main body 1101 has an opening at one end facing the nail strip 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 block 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 mounted on the second opening 1105, which facilitates cleaning of the interior of the liquid storage chamber 111. The plunger 1104 has a through hole, and the nail strip tube 302 is passed through the through hole. To prevent the electrolyte from flowing out from between the nail strip tube 302 and the plunger 1104 , a fourth sealing member 1103 is installed between the inner wall of the through hole and the outer wall of the nail strip tube 302 to seal the gap between the nail strip tube 302 and the plunger 1104 .

[0046] Continue to refer Figure 11 In one embodiment, the adsorption mechanism 110 further includes at least one fifth sealing member 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 the fifth sealing members 1106 can be two, three, etc., and is not specifically limited in this application, so as to improve the sealing effect between the plunger 1104 and the body 1101.

[0047] The fourth sealing member 1103 and the fifth sealing member 1106 may be sealing rings.

[0048] In a further embodiment, a boss 11041 may be provided on the outer periphery of the plunger 1104, facing away from the negative pressure tube 112. The boss 11041 abuts against the end surface of the body 1101 facing the front end of the rivet gun, thereby improving the sealing effect. Furthermore, the boss 11041 can extend the flow path of the electrolyte, so that the electrolyte will not flow out of the liquid storage chamber 111 until a large amount of electrolyte has accumulated in the liquid storage chamber 111, thereby making it more difficult for the electrolyte to flow out of the liquid storage chamber 111.

[0049] When using a rivet gun to rivet the liquid injection hole, a common posture is to point the gun muzzle toward the battery cell below the rivet gun, that is, the suction mechanism 110 is located above the rivet mechanism. In this way, the surface of the plunger 1104 facing the negative pressure tube 112 serves as the bottom wall of the liquid storage chamber 111. If there is a large amount of electrolyte in the liquid storage chamber 111, droplets will accumulate on the plunger 1104 due to gravity and may flow into the gap between the plunger 1104 and the nail strip tube 302, contacting the fourth seal 1103. This may cause corrosion of the fourth seal 1103.

[0050] To reduce the 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 groove 1107, and the liquid storage groove 1107 is located at one end of the first surface 111 close to the negative pressure tube 112. When the electrolyte enters the liquid storage chamber 111 from the nail row tube 302, due to the airflow adsorption of the adsorption mechanism 110, the electrolyte usually splashes into the liquid storage chamber 111 in the form of droplets. Since the opening of the nail row tube 302 is close to the opening of the negative pressure tube 112, the liquid storage groove 1107 is provided at the end of the liquid storage chamber 111 close to the negative pressure tube 112, which is conducive to collecting the droplets splashing out of the nail row tube 302, so as to reduce the electrolyte falling into the bottom of the liquid storage chamber 111.

[0051] Figure 12 A structural diagram of a nail stripping tube and an adsorption mechanism is provided in another embodiment of the present application, as shown in FIG. Figure 12 As shown, in a further embodiment, the liquid reservoir 1107 is inclined toward the negative pressure tube 112. The liquid reservoir 1107 includes a first sidewall 11071, a second sidewall 11072, and a bottom wall 11073. The first sidewall 11071 and the second sidewall 11072 are disposed opposite each other and are respectively connected to the bottom wall 11073. The first sidewall 11071 is connected to the second surface 1112 and is coplanar. During riveting, a small amount of liquid droplets splash into the liquid reservoir 1107. Due to the inclined configuration of the liquid reservoir 1107, the liquid droplets in the liquid reservoir 1107 flow toward the bottom wall 11073 under the action of gravity, and are less likely to flow out of the liquid reservoir 1107 and land on the plunger 1104. Furthermore, the liquid storage tank 1107 is inclined toward the negative pressure tube 112 , and the first side wall 11071 is connected to the second surface 1112 and is located on the same plane, which facilitates the liquid droplets to be sucked into the negative pressure tube 112 and then discharged.

[0052] Figure 13 A structural diagram of a nail stripping tube and an adsorption mechanism is provided in another embodiment of the present application, as shown in FIG. Figure 13 As shown, in a further embodiment, the first surface 111 may be provided with a plurality of liquid storage grooves 1107, which are spaced apart along the axial direction of the liquid storage chamber 111. The plurality of liquid storage grooves 1107 can store more liquid droplets and reduce the situation where liquid droplets fall on the surface of the plunger 1104.

[0053] The rivet gun of the present application can be used to seal the injection holes of battery cells. When the battery cell is manufactured, the battery cell assembly is first placed in the battery shell, and then the battery cover assembly is covered with the battery shell, and then the electrolyte is injected into the accommodating cavity enclosed by the battery cover assembly and the battery shell through the injection hole on the battery cover assembly. Then the blind rivet is inserted into the injection hole, and after riveting, the injection hole on the battery cover assembly is sealed. The rivet gun of the present application is used for riveting, and the riveting quality is reliable and the riveting efficiency is high. The electrolyte sucked into the rivet gun during riveting can be collected and discharged in time. The damage to the components in the rivet gun caused by the electrolyte is avoided, and the service life of the rivet gun is improved.

[0054] In the second aspect, an embodiment of the present application further provides a rivet control system, which includes the above-mentioned rivet gun and a control device, the control device including a receiving unit and a control unit, the receiving unit is used to receive the tension value detected by the tension detection unit, and the control unit is used to control the rotation of the motor.

[0055] In a third aspect, an embodiment of the present application further provides a riveting control method, comprising the following steps: S1: Generate training set; S2: Set the preset tension value; S3: Control the motor speed and angle and obtain the tension value in real time; S4: According to the training set and in combination with the actual tensile force value obtained in real time, the rotation speed and angle of the motor are adjusted to break the rivet.

[0056] Specifically, a rivet gun is equipped with jaws of varying degrees of wear, and multiple training runs are performed on rivets of varying material and specifications. The control system algorithm is trained on these samples, and multiple iterations of the algorithm form a training set, enabling self-learning. Generating the training set involves creating multiple sets of rivet test samples and collecting data on the motor's rotational speed and angle at different pulling forces within these test samples.

[0057] The jaws of the rivet guns in each rivet test sample had different degrees of wear, and the rivets had different specifications, including rivets of different materials and sizes.

[0058] The algorithm model is built using feedback from the rivet gun's tension detection unit. It combines the ART-RBF (Soft Competitive Adaptive Resonance Theory & Radial Basis Function) algorithm with PID control to adaptively adjust PID control parameters, thereby improving rivet preload accuracy and efficiency. PID (Proportional-Integral-Differential) control is a widely used engineering control technology that adjusts system errors through proportional, integral, and differential control methods to achieve precise control. PID controller parameters can be tuned through theoretical calculations or engineering experience. It features a simple structure, good stability, and easy adjustment, making it widely used in industrial automation.

[0059] During the sample experiment, 50 sets of claws 201 with different degrees of wear can be set. The rotation angle and speed of the motor 100 when the preload force starts from 0 and reaches 100N are collected through the tension detection unit during the preload process, and the parameters of rivets of different specifications are recorded to construct a training set: , in, , s is the motor rotation angle, are the rivet parameters.

[0060] are the PID controller parameters, To output the absolute value error, after 1000 iterations of system training, the actual preload force of the rivet is controlled within 3% of the expected value.

[0061] Since the rivet will deform (expand) under stress, the expansion will eliminate part of the tension; The peak tensile force is used as the acquisition target, and the peak force for nail extraction is controlled to ensure both nail capture and rivet deformation. For example, if the initial motor speed is 8 mm / s, the peak tensile force for nail extraction is set to 100 N.

[0062] The control system adjusts the motor speed and angle according to the peak tension feedback from the tension detection unit of the rivet gun. The closer the peak tension feedback is to the preset tension value, the slower the motor speed, thereby accurately controlling the tension for nail removal.

[0063] The soft competition algorithm, ART-RBF, combines with the PID algorithm to adaptively adjust PID control parameters, providing the optimal motor speed and angle in real time based on the results of tension testing. During the rivet breaking process, the motor's current position is fed back to the control system, which then generates a specific angle. The motor then rotates to that angle to break the rivet.

[0064] The present invention's rivet control method improves rivet pre-tightening accuracy, preventing rivet deformation during the pre-tightening phase. The rivet gun's jaws wear out over repeated use, but the present invention's control method automatically and accurately corrects parameters, improving rivet efficiency and accuracy.

[0065] The specific riveting process is as follows: 1. Nail removal stage: 1) Remove the rivet from the rivet gun: insert the rivet into the gun head assembly; 2) Rivet pre-tightening stage. For example, if the pre-tightening force is set to 100N, the control system controls the motor to rotate in the forward direction at high speed, driving the riveting mechanism upward. Simultaneously, the tension detection unit detects the real-time tension value and transmits it to the control system. The control system changes the motor's rotation speed based on the feedback of the tension value. When the tension approaches 100N, the control system controls the motor to slow down until the tension reaches 100N, at which point the motor stops rotating. The rivet gun completes pre-tightening.

[0066] 2. Breaking stage: 1) The rivet gun drives the pre-tightened rivet into the liquid filling port of the battery cell; 2) The control system controls the motor to start forward rotation to drive the rivet mechanism to rise. The control system judges the execution status according to the tension value fed back by the tension detection unit. When the rivet is broken, after the tension feedback exceeds 500N, it waits for the tension feedback to fall below 50N, and the rivet is considered broken. 3) After the rivet is broken, the control system controls the motor to rotate and move the riveting mechanism a fixed distance, so that the broken rivet rod is completely separated from the rivet cap; 3. Waste nail removal stage: 1) Start the negative pressure mechanism to generate negative pressure; 2) The control system controls the motor to rotate in the opposite direction, driving the rivet mechanism to descend and return to its initial position. At this time, the gun head assembly 5 opens the jaws 2, releasing the nail rod, which is then sucked by the negative pressure mechanism and discharged from the tail end of the rivet gun. 3) At this point, the sealing and riveting of the liquid injection port is completed.

[0067] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A rivet gun, characterized in that: include: A clamping sleeve, a clamping claw, a tension detection unit, a nail row tube assembly and a driving mechanism, wherein the nail row tube assembly is arranged in the clamping sleeve, the tension detection unit is used to detect the tension of the clamping sleeve, and the driving mechanism includes a motor, which is used to drive the clamping sleeve to move along the axial direction of the clamping sleeve, wherein: The clamping jaw is arranged in the clamping sleeve, and the end of the clamping sleeve has a push surface facing the clamping jaw. The nail row tube assembly includes a push rod and a nail row tube. The push rod is fixedly connected to the end of the nail row tube, and the clamping jaw is located between the push surface and the push rod. The clamping sleeve has a gas chamber, which is located on a side of the push rod facing away from the clamping jaws. The gas chamber is filled with compressed gas, and the compressed gas is used to provide a thrust for the push rod toward the clamping jaws. When the clamping sleeve moves toward the tail end, the push rod drives the clamping jaw to fit tightly with the pushing surface under the action of air pressure, and the pushing surface pushes the outer periphery of the clamping jaw so that the clamping jaw clamps the nail rod.

2. The rivet gun according to claim 1, characterized in that: The driving mechanism further includes a screw rod connected to the clamping sleeve, and the motor is used to drive the screw rod to rotate so that the clamping sleeve moves along the axial direction of the clamping sleeve.

3. The rivet gun according to claim 2, characterized in that: The screw rod has a hollow structure, the nail row tube is inserted into the screw rod, a first seal is provided between the outer wall of the nail row tube and the inner wall of the screw rod, a second seal is provided between the outer wall of the push rod and the inner wall of the clamping sleeve, and the nail row tube assembly, the cylindrical wall of the clamping sleeve and the screw rod enclose to form the gas chamber.

4. A rivet control system, characterized in that: include: The rivet gun and control device according to any one of claims 1 to 3, wherein the control device includes a receiving unit and a control unit, the receiving unit is used to receive the tension value detected by the tension detection unit, and the control unit is used to control the rotation of the motor.

5. A riveting control method, characterized in that: The following steps are involved: S1: Generate training set; S2: Set the preset tension value; S3: Control the motor speed and angle and obtain the tension value in real time; S4: According to the training set and in combination with the actual tensile force value obtained in real time, the rotation speed and angle of the motor are adjusted to break the rivet.

6. The riveting control method according to claim 5, characterized in that: Generating a training set includes: Establish multiple groups of rivet test samples; The rotation speed and angle of the motor under different tension values in the multiple groups of test samples are collected.

7. The riveting control method according to claim 6, characterized in that: The different pulling force values F satisfy: 0N<F<100N.

8. The riveting control method according to claim 6, characterized in that: The multiple groups of rivet test samples include clamps with different degrees of wear and rivets with different specifications.

9. The riveting control method according to claim 8, characterized in that: The rivets of different specifications include rivets of different materials and different sizes.

10. The riveting control method according to claim 5, characterized in that: Adjusting the rotation speed of the motor to break the rivet based on the training set and the actual tensile force value obtained in real time includes controlling the rotation speed of the motor to slow down based on the training set when the tensile force value approaches the preset value; When the preset tension value is reached, the motor is controlled to stop rotating.

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