A handheld dual-mode resistance spot welding gun

Abstract

The present invention relates to a handheld dual-mode resistance spot welding gun, comprising a gun body of the resistance spot welding gun, a pressure sensor and an elastic member disposed within the gun body; the rear end of the gun body is connected to a cylinder whose piston rod extends into the interior of the gun body, and the front end is provided with an electrode head located outside the gun body; the rear end of the pressure sensor is connected to the piston rod of the cylinder, and the front end is in contact with the elastic member; the front end of the elastic member is connected to a connector, an electrode rod is provided between the connector and the electrode head, the electrode rod is disposed within the gun body and its two ends are correspondingly connected to the electrode head and the connector, the connector is provided with a connection portion extending out of the gun body, and the gun body is also connected to a handle. The invention is lightweight in design, can be operated by one person, can quickly move for spot welding, and can quickly switch between manual and pneumatic modes. It is fully applicable to spot welding of large areas of vehicle body skins, is more flexible and convenient to use, effectively improves efficiency, and is energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the field of welding, in particular to a handheld dual-mode resistance spot welding gun capable of quickly switching between manual and pneumatic operation. Background Art

[0002] Welding is a critical process in industrial production, and spot welding is a welding method performed using a spot welder. Traditional resistance spot welders currently require a pressure of 2000N to 3000N to spot weld a 1.0mm thick galvanized steel sheet. These machines require a frame for support, resulting in high welding pressure, bulk, and inconvenience in mobility. Traditional spot welders are inadequate in many applications, such as spot welding the side panels of bus bodies on a bus production line. This necessitates the traditional welding process, which involves first using a plasma cutter to create a welding hole in the panel, then using a CO2 gas shielded welder to plug weld the hole to the body frame. This results in raised welds, a labor-intensive post-processing grind, and significant pollution from smoke, glare, noise, and radiation. The CO2 gas and consumable wire costs of CO2 gas shielded welders are high, and the multiple steps involved, including initial hole cutting and subsequent grinding, result in low efficiency and hinder production efficiency. Summary of the Invention

[0003] In view of the existing deficiencies, the present invention provides a handheld dual-mode resistance spot welding gun which can quickly switch between manual and pneumatic operation.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a handheld dual-mode resistance spot welding gun, comprising a gun body of the resistance spot welding gun, a pressure sensor and an elastic member arranged in the gun body; the rear end of the gun body is connected to a cylinder with a piston rod extending into the inside of the gun body, and the front end is provided with an electrode head located outside the gun body; the rear end of the pressure sensor is connected to the piston rod of the cylinder, and the front end is in contact with the elastic member; the front end of the elastic member is connected to a connecting member, an electrode rod is provided between the connecting member and the electrode head, the electrode rod is passed through the gun body and the two ends are correspondingly connected to the electrode head and the connecting member, the connecting member is provided with a connecting portion passing through the gun body, and the gun body is also connected to a handle; the front end of the gun body can also be detachably connected to a C-shaped hook arm for hooking a workpiece, and the electrode head is located in the opening of the hook arm, The hook arm is also provided with a horizontal positioning piece for positioning the workpiece opposite to the electrode head on the inner wall of the opening; the hook arm is detachably mounted on the gun body, and the hook arm is also provided with a vertical positioning piece for positioning the workpiece in the vertical direction perpendicular to the horizontal positioning piece; a switch assembly is installed on the gun body, which is electrically connected to the pressure sensor, electrode rod and cylinder respectively, and the switch assembly includes a welding / adjustment operation selection switch electrically connected to the pressure sensor and electrode rod, a manual or pneumatic mode mode selection switch electrically connected to the electrode rod and cylinder, and a cylinder start switch electrically connected to the cylinder; the handle is arranged at the tail of the cylinder, and a switch seat is provided adjacent to the handle on the cylinder, the operation selection switch and mode selection switch are arranged on the switch seat, and the cylinder start switch is arranged on the handle.

[0005] Preferably, an insulating guide sleeve is provided between the electrode rod and the gun body and is sleeved on the electrode rod.

[0006] Preferably, the connecting member is provided with a first water hole, a second water hole and a third water hole which are interconnected; a first water pipe connected to the first water hole is passed through the electrode rod, a second water pipe connected to the second water hole is passed through the connecting portion, and the third water hole is connected to a third water pipe located outside the gun body.

[0007] Preferably, the front end of the gun body is detachably connected to an auxiliary handle.

[0008] Preferably, a lifting ring is connected to the gun body.

[0009] Preferably, the gun body includes a welding gun body and a welding gun cover that are covered and connected together, the pressure sensor and the elastic member are both located in the welding gun body, the cylinder and the handle are both connected to the welding gun body, the electrode rod is passed through the welding gun body, the connecting part is located in the welding gun body and the connecting part passes through the welding gun cover, and the connecting part is connected to a cable connecting sleeve.

[0010] The beneficial effects of the present invention are that the invention includes both manual pressurization and pneumatic pressurization modes for selection. The manual pressurization mode has a wide range of applications and requires manual force for pressurized spot welding. The pneumatic pressurization mode uses cylinder force for spot welding, which can reduce manual labor intensity. The pressurization mode can be freely selected according to the welding product, quickly switched, and manual operation can be achieved by one person. Spot welding can be quickly moved, which is more convenient and flexible to use. It effectively meets the needs of spot welding of large-area vehicle body skins and avoids the problems of high pollution, high operating costs and low efficiency of traditional hole cutting and plug welding processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention;

[0012] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0013] Figure 3 It is a schematic diagram of the decomposition structure of the present invention;

[0014] Names and serial numbers of parts in the figure: 1-Gun body 10-Operation selection switch 11-Mode selection switch 12-Cylinder start switch 13-Auxiliary handle 14-Lifting ring 15-Welding gun body 16-Welding gun cover 2-Pressure sensor 3-Elastic part 4-Cylinder 40-Piston rod 41-Switch seat 5-Electrode head 6-Connecting part 60-Connecting part 61-First water pipe 62-Second water pipe 63-Third water pipe 64-Cable connecting sleeve 7-Electrode rod 70-Insulating guide sleeve 8-Handle 9-Hook arm 90-Horizontal positioning part 91-Vertical positioning part. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments for a clear and complete description. Obviously, the embodiments described are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. In addition, the directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only reference to the directions of the attached diagrams. The directional terms used are for better and clearer explanation and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have, and therefore cannot be understood as limiting the present invention.

[0016] The present invention is implemented as follows Figures 1 to 3As shown in, a handheld dual-mode resistance spot welding gun comprises a gun body 1 of a resistance spot welding gun, a pressure sensor 2 and an elastic member 3 arranged in the gun body 1; the rear end of the gun body 1 is connected to a cylinder 4 with a piston rod 40 extending into the interior of the gun body 1, and the front end is provided with an electrode head 5 located outside the gun body 1; the rear end of the pressure sensor 2 is connected to the piston rod 40 of the cylinder 4, and the front end is in contact with the elastic member 3; the front end of the elastic member 3 is connected to a connecting member 6, and an electrode rod 7 is provided between the connecting member 6 and the electrode head 5, the electrode rod 7 is passed through the gun body 1 and the two ends are correspondingly connected to the electrode head 5 and the connecting member 6, that is, from the front end to the rear end of the gun body 1 are the electrode head 5, the electrode rod 7, the connecting member 6, the elastic member 3, the pressure sensor 2, and the cylinder 4 in sequence; the electrode head 5 and the cylinder 4 are outside the gun body 1, and the cylinder 4 can be connected to the gun body 1 through a connecting seat. At this time, the cylinder 4 is first fixed on the connecting seat, and then the connecting seat is connected to the gun body 2 by screws. , the structure is simple, which makes it convenient to connect the cylinder 4 to the gun body 2 and to replace and maintain it; the electrode head 5 is connected to the electrode rod 7 and is indirectly connected to the gun body 1 through the electrode rod 7; the electrode rod 7 is arranged on the gun body 1, that is, part of it is located inside the gun body 1 and part is outside the gun body 1. The part outside the gun body 1 is connected to the electrode head 5, and the connection with the electrode head 5 can be connected by a connecting rod or directly; the connecting member 6, the elastic member 3, and the pressure sensor 2 are all located in the gun body 1, the elastic member 3 is a compression spring, and the pressure sensor 2 uses a miniature load pressure sensor. The connecting member 6 is provided with a connecting portion 60 that passes through the gun body 1, and the spot welding gun can be conveniently connected to an external device through a cable at the connecting portion 60. The gun body 1 is also connected with a handle 8. The setting of the handle 8 is convenient for the user to hold the spot welding gun. It can be set at any position of the gun body 1 according to different usage methods and habits. When in use, the resistance spot welding gun is assembled on a handheld single-sided single-point resistance welding machine and is connected to the welding machine transformer through a water-sensing main cable. In manual mode, a person applies force on the gun body 1 and the handle 8, and presses the workpiece with the electrode head 5. During the force application process, the electrode head 5 retracts. When the applied pressure value reaches the set value, a discharge welding signal is automatically sent to the welding machine controller; or the pressure directly applied by the cylinder 4 passes through the micro load pressure sensor, compression spring and electrode rod 7 inside the gun body 1, and then is applied to the welded workpiece via the electrode head 5. When the pressure value reaches the set value, the welding gun automatically sends a discharge welding signal. During the discharge welding process, the electrode head 5 still has a retraction stroke, and manpower or cylinder force continues to apply pressure until the retraction stroke is exhausted. In manual mode, the entire pressurization, welding, and pressure holding process take about 0.3 seconds, which is consistent with the human hand's habit of quickly pushing the force. In pneumatic mode, the cylinder 4 automatically pressurizes the spot welding, and manpower or cylinder 4 outputs pressure. The structure is light and replaces the existing vehicle body side skin cutting and plugging welding process, thereby improving efficiency and energy saving and environmental protection.The spot welding gun includes both manual pressurization and pneumatic pressurization modes. The manual pressurization mode has a wide range of applications and requires manual pressure spot welding. The pneumatic pressurization mode uses cylinder output for spot welding, which can reduce labor intensity. The pressurization mode can be freely selected according to the welding product, quickly switched, and manual operation can be achieved by one person. It can quickly move the spot welding, which is more convenient and flexible to use. It effectively meets the needs of large-area car body skin spot welding and avoids the high pollution, high operating cost and low efficiency of the traditional hole cutting and plug welding process.

[0017] Further improvements, such as Figures 1 to 3 As shown in the figure, the front end of the gun body 1 can also be detachably connected with a C-shaped hook arm 9 for hooking the workpiece. The setting of the hook arm 9 makes it convenient to better position the workpiece for welding in the pneumatic mode. When in use, the hook arm 9 is hooked on the back of the workpiece to be welded to fix the workpiece to be welded. The detachable function makes it convenient to use it. It is installed to hook the workpiece in the pneumatic state and removed in the manual state. The electrode head 5 is located in the opening of the hook arm 9, and the hook arm 9 is also provided with a horizontal positioning piece 90 for positioning the workpiece opposite to the electrode head 5 on the inner wall of the opening. When welding, the workpiece to be welded is placed in the hook arm 9, the back is hooked by the horizontal positioning piece 90, and the front is pressed by the electrode head 5, so that the workpiece to be welded is fixed in the opening of the hook arm 9 by the horizontal positioning piece 90 and the electrode head 5. At this time, in order to facilitate the adjustment of the hooking position of the hook arm 9, the hook arm 9 can be detachably mounted on the gun body 1, so that the position of the hook arm 9 on the gun body 1 can be adjusted, and then the distance between the electrode head 5 and the horizontal positioning member 90 can be adjusted to adapt to workpieces of different thicknesses to be welded. At the same time, the angle of the hook arm 9 on the gun body 1 can also be adjusted to adapt to different welding requirements. The hook arm 9 is also provided with a vertical positioning member 91 that is perpendicular to the horizontal positioning member 90 and positions the workpiece in the vertical direction. During welding, the position of the workpiece to be welded can be better fixed, which facilitates welding and makes welding more accurate.

[0018] Further improvements, such as Figures 1 to 3As shown in , the gun body 1 is equipped with a switch assembly electrically connected to the pressure sensor 2, the electrode rod 7 and the cylinder 4 respectively. The switch assembly can be an external device connected to the gun body or built into the gun body 1. The switch assembly includes a welding / adjustment operation selection switch 10 electrically connected to the pressure sensor 2 and the electrode rod 7, a manual or pneumatic mode mode selection switch 11 electrically connected to the electrode rod 7 and the cylinder 4, and a cylinder start switch 12 electrically connected to the cylinder 4. The operation selection switch 10 and the mode selection switch 11 are both rocker switches for easy use during welding, while the cylinder start switch 12 uses a built-in push button switch to avoid misoperation. At this time, in order to facilitate operation, the handle is set at the tail of the cylinder, and a switch seat is provided on the cylinder adjacent to the handle. The operation selection switch and mode selection switch are set on the switch seat, and the cylinder start switch is set on the handle.

[0019] Further improvements, such as Figure 1 and Figure 3 As shown in FIG, an insulating guide sleeve 70 is provided between the electrode rod 7 and the gun body 1 and sleeved on the electrode rod 7, thereby ensuring good insulation and improving the stability of the resistance spot welding gun.

[0020] Further improvements, such as Figure 2 As shown in the figure, the connecting member 6 is provided with a first water hole, a second water hole and a third water hole (all not marked in the figure) which are interconnected; a first water pipe 61 connected to the first water hole is penetrated by the electrode rod 7, a second water pipe 62 connected to the second water hole is penetrated by the connecting portion 60, and a third water pipe 63 located outside the gun body 1 is connected to the third water hole. The external water cable is connected to the connecting member 6 through the connecting portion 60, and the water of the external water cable enters the first water pipe 61 through the second water pipe 62, thereby cooling the electrode rod 7 and the electrode head 5. The cooled water flows into the third water pipe 63 through the space between the electrode rod 7 and the first water pipe 61 and is discharged.

[0021] Further improvements, such as Figures 1 to 3 As shown in the figure, the front end of the gun body 1 is also detachably connected to an auxiliary handle 13, which can be selected according to the user's usage habits. The auxiliary handle 13 can be installed when needed and removed when not needed, which is convenient for people to use and also makes it easier to hold the spot welding gun during use. At this time, the auxiliary handle 13 can be threadedly connected to the gun body 1 using a columnar structure.

[0022] Further improvements, such as Figures 1 to 3As shown in the figure, the gun body 1 is connected with a lifting ring 14, which is connected to a labor-saving spring balancer that matches the welding equipment. The spot welding gun can be easily lifted through the lifting ring 14, which is convenient for welding and helps the user to hold the spot welding gun. According to different needs, the lifting ring 14 can be fixed on the gun body 1 or connected to the gun body 1 in a detachable manner to meet the needs of use in different situations.

[0023] Further improvements, such as Figure 2 and Figure 3 As shown in the figure, the gun body 1 includes a welding gun body 15 and a welding gun cover 16 that are covered and connected together. The covering connection between the two can use a traditional connection through screws or a mortise and tenon structure. After the two are covered, a accommodating cavity is formed inside, and other components can be installed in the accommodating cavity. The covering method also facilitates the repair and maintenance of the various components arranged in the welding gun body 15. The pressure sensor 2 and the elastic member are both located in the welding gun body 15, the cylinder 4 and the handle 8 are both connected to the welding gun body 15, the electrode rod 7 is passed through the welding gun body 15, the connecting member 6 is located in the welding gun body 15 and the connecting part is passed through the welding gun cover 16, and a cable connecting sleeve 64 is connected to the connecting part 60, and the spot welding gun can be conveniently connected to an external device through the cable connecting sleeve 64.

[0024] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A handheld dual-mode resistance spot welding gun, characterized by: The invention comprises a gun body of a resistance spot welding gun, a pressure sensor and an elastic part arranged in the gun body; the rear end of the gun body is connected to a cylinder with a piston rod extending into the inside of the gun body, and the front end is provided with an electrode head located outside the gun body; the rear end of the pressure sensor is connected to the piston rod of the cylinder, and the front end is in contact with the elastic part; the front end of the elastic part is connected to a connecting part, and an electrode rod is provided between the connecting part and the electrode head, the electrode rod is passed through the gun body and the two ends are correspondingly connected to the electrode head and the connecting part, the connecting part is provided with a connecting part passing through the gun body, and the gun body is also connected to a handle; the front end of the gun body can also be detachably connected to a C-shaped hook arm for hooking a workpiece, the electrode head is located in the opening of the hook arm, and the hook arm is also provided with a connection for connecting with the electrode on the inner wall of the opening. The gun body is provided with a horizontal positioning piece for positioning the workpiece relative to the head; the hook arm is detachably mounted on the gun body, and the hook arm is also provided with a vertical positioning piece for positioning the workpiece in the vertical direction perpendicular to the horizontal positioning piece; the gun body is provided with a switch assembly electrically connected to the pressure sensor, electrode rod and cylinder respectively, the switch assembly includes a welding / adjustment operation selection switch electrically connected to the pressure sensor and electrode rod, a manual or pneumatic mode mode selection switch electrically connected to the electrode rod and cylinder, and a cylinder start switch electrically connected to the cylinder; the handle is arranged at the tail of the cylinder, and a switch seat is provided adjacent to the handle on the cylinder, the operation selection switch and mode selection switch are arranged on the switch seat, and the cylinder start switch is arranged on the handle.

2. The handheld dual-mode resistance spot welding gun according to claim 1, characterized in that: An insulating guide sleeve is provided between the electrode rod and the gun body and is sleeved on the electrode rod.

3. The handheld dual-mode resistance spot welding gun according to claim 1, characterized in that: The connecting member is provided with a first water hole, a second water hole and a third water hole which are connected to each other; a first water pipe connected to the first water hole is passed through the electrode rod, a second water pipe connected to the second water hole is passed through the connecting part, and the third water hole is connected to a third water pipe located outside the gun body.

4. The handheld dual-mode resistance spot welding gun according to claim 1, characterized in that: The front end of the gun body is also detachably connected with an auxiliary handle.

5. The handheld dual-mode resistance spot welding gun according to claim 1, characterized in that: The gun body is connected with a lifting ring.

6. The handheld dual-mode resistance spot welding gun according to claim 1, characterized in that: The gun body includes a welding gun body and a welding gun cover that are covered and connected together. The pressure sensor and the elastic member are both located in the welding gun body. The cylinder and the handle are both connected to the welding gun body. The electrode rod is passed through the welding gun body. The connecting member is located in the welding gun body and the connecting part passes through the welding gun cover. A cable connecting sleeve is connected to the connecting part.

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