A spot welding device for the production of the right A-pillar lower inner panel assembly

Abstract

The present invention relates to the technical field of spot welding devices, and provides a spot welding device for the production of the right A-pillar lower inner panel assembly, which includes a welding main body having two spot welding heads, and the two spot welding heads are symmetrically arranged; a base is arranged on the welding main body, and the base has a processing channel; a grinding block is rotatably arranged in the processing channel, and after the grinding block rotates, both ends of the grinding block are used to grind the two spot welding heads respectively; a clamping ring is rotatably arranged in the processing channel and is located at one end of the grinding block. The inner diameter of the clamping ring is larger than the diameter of the spot welding head, and the clamping ring is used to disassemble the spot welding head. Through the above technical solution, the problem in the prior art that the functions of cleaning and grinding the electrode cap and the function of replacing and disassembling are separately set, and each occupies the space of the equipment, resulting in the inability to simplify and reduce the equipment is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of spot welding devices, and more specifically, to a spot welding device for the production of the right A-pillar inner panel assembly. Background Art

[0002] In automobile manufacturing, the safety and integrity of the body structure are of crucial importance. As a key component of the body frame, the finished product quality of the right A-pillar inner panel assembly will directly affect the structural strength and safety performance of the whole vehicle. Due to its complex processing position, traditional manual spot welding methods have many limitations in the production process of this component.

[0003] With the current development of robotic spot welding and the continuous improvement of the production quality and efficiency requirements for the right A-pillar inner panel assembly, a high-precision and highly reliable fixture set is used in cooperation with a robotic spot welding device to ensure that each welding operation is completed quickly and meets strict quality standards.

[0004] Generally, an electrode cap is required for spot welding. However, after long-term use, a large amount of welding spatter, welding slag, and oxides will accumulate on the surface of the electrode cap. Generally, when the thickness of the spatter on the surface of the electrode cap reaches about 0.5 - 1 mm, it is necessary to clean it. At the same time, to ensure welding quality, the electrode cap also needs to be replaced regularly or cleaned and ground. However, the devices for cleaning, grinding, and replacing the electrode cap on the spot welding device are set independently, and each occupies the space of the equipment, resulting in low space utilization rate of the equipment and being not conducive to reducing the volume of the equipment. Summary of the Invention

[0005] The present invention provides a spot welding device for the production of the right A-pillar inner panel assembly, which solves the problem in the related art that the functions of cleaning, grinding, and replacing the electrode cap are set separately, each occupying the space of the equipment, resulting in the inability to simplify and reduce the equipment.

[0006] The technical solution of the present invention is as follows:

[0007] A spot welding device for the production of the right A-pillar inner panel assembly, comprising:

[0008] A welding main body, which has two spot welding heads, and the two spot welding heads are symmetrically arranged;

[0009] A base, which is arranged on the welding main body, and the base has a processing channel;

[0010] A grinding block, which is rotatably arranged in the processing channel. After the grinding block rotates, both ends of the grinding block are used to grind the two spot welding heads respectively;

[0011] A clamping ring, which is rotatably arranged in the processing channel, is located at one end of the grinding block. The inner diameter of the clamping ring is larger than the diameter of the spot welding head, and the clamping ring is used to disassemble the spot welding head.

[0012] As a further technical solution, both ends of the grinding block have concave conical surfaces. After the grinding block rotates, the two concave conical surfaces are used to grind the two spot welding heads respectively.

[0013] As a further technical solution, the grinding block is cylindrical, and there is also an avoidance hole at the central axis position of the grinding block. The two concave conical surfaces are respectively located at both ends of the avoidance hole, and the two concave conical surfaces are symmetrically arranged.

[0014] As a further technical solution, the grinding block also has a notch, the notch extends from the outer wall of the grinding block to the avoidance hole, and a cutting and grinding line is provided at the edge position of the notch.

[0015] As a further technical solution, the processing channel is cylindrical, and the axial direction of the processing channel, the rotation axial direction of the grinding block, and the rotation axial direction of the clamping ring are collinear. And there are two clamping rings, and the two clamping rings are respectively located at both ends of the grinding block.

[0016] As a further technical solution, both ends of the processing channel have openings, and the two clamping rings are respectively located at the two openings.

[0017] As a further technical solution, the base also has three annular air paths and an air inlet passage. The three annular air paths and the air inlet passage are all communicated with the processing channel, and the two clamping rings and the grinding block respectively penetrate through the three annular air paths. It also includes:

[0018] A number of convex plates are arranged around the clamping ring and the grinding block. The convex plates are used to bear the wind force and drive the clamping ring and the grinding block to rotate.

[0019] As a further technical solution, the inner wall of the clamping ring has a number of installation grooves, and the number of installation grooves is arranged in a circumferential arrangement around the clamping ring. It also includes:

[0020] A clamping block, which is movably arranged in the installation groove. After the clamping block moves, it extends into or out of the installation groove, and the moving direction of the clamping block is arranged along the radial direction of the clamping ring;

[0021] An elastic member is arranged in the installation groove, one end is connected to the clamping block, and the other end is connected to the clamping ring. The elastic member provides a force for the clamping block to extend out of the installation groove, and the clamping ring drives the clamping block to move after rotating.

[0022] As a further technical solution, the welding main body includes:

[0023] A fixture group and a robotic arm. The robotic arm is arranged on one side of the fixture group. Two spot welding heads are provided at the end of the robotic arm, and the base is arranged on the fixture group.

[0024] As a further technical solution, the base is rotatably arranged on the fixture group, and the rotation axis of the base is perpendicular to the rotation axis of the grinding block.

[0025] The working principle and beneficial effects of the present invention are as follows:

[0026] 1. Improve space utilization rate: Since welding devices for large-sized automotive components generally have the common problem of large floor space, this spot welding device integrates the functions of cleaning, grinding, replacing, and disassembling electrode caps. Compared with the traditional method where these two functions are separately arranged on the spot welding device, the overall volume of the equipment is greatly reduced, making the production line layout more compact and reasonable, improving the space utilization rate of the production site, and saving valuable production space resources for enterprises.

[0027] 2. Enhance production efficiency: The integrated functions are specifically configured in the base on the welding main body. The processing channels opened therein are cleverly arranged with grinding blocks and clamping rings, enabling the grinding and replacement operations of the electrode caps to be quickly switched on the same device. Since the welding of such components is usually completed by two groups of symmetrically arranged spot welding heads, and the electrode caps on both need to be cleaned or disassembled, processing channels are opened instead of processing grooves, and the inner diameter of the clamping ring is larger than the diameter of the spot welding head to avoid interference of the clamping ring on one side of the grinding block with the spot welding head close to the grinding block. The spot welding head can penetrate the clamping ring and contact the end of the grinding block for cleaning and grinding.

[0028] When the electrode cap reaches the replacement condition, the clamping ring can quickly disassemble it. This integrated design reduces the time consumed in the traditional method due to device switching and electrode cap transfer, thereby improving the production efficiency of the right inner panel assembly of the A-pillar, enabling enterprises to produce more qualified products per unit time, and enhancing the market competitiveness of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners of the present invention in a clear and understandable manner in combination with the drawings of the preferred embodiments.

[0030] Figure 1 It is a schematic structural diagram of a spot welding device for producing a right inner panel assembly of the A-pillar in the present invention;

[0031] Figure 2 For the present invention Figure 1 Enlarged view of part A;

[0032] Figure 3 For the present invention Figure 1 Enlarged view of part B in the present invention;

[0033] Figure 4 For the present invention Figure 3 Enlarged view of part C in the present invention;

[0034] Figure 5 Schematic structural view of the grinding block in the present invention;

[0035] Figure 6 Schematic structural view of the clamping ring in the present invention;

[0036] Figure 7 For the present invention Figure 6 Enlarged view of part D in the present invention;

[0037] Figure 8 Partial cross-sectional view of the position of the grinding block in the base of the present invention;

[0038] Figure 9 For the present invention Figure 8 Enlarged view of part E in the present invention;

[0039] Figure 10 Partial cross-sectional view of the position of the clamping ring in the base of the present invention;

[0040] Figure 11 For the present invention Figure 10 Enlarged view of part F in the present invention.

[0041] In the figure: 1. Welding main body, 101. Spot welding head, 102. Fixture group, 103. Robot arm, 2. Base, 201. Processing channel, 202. Opening, 203. Annular gas path, 204. Air inlet channel, 3. Grinding block, 301. Concave conical surface, 302. Avoidance hole, 303. Notch, 304. Cutting and grinding line, 4. Clamping ring, 401. Installation groove, 5. Convex plate, 6. Clamping block, 7. Elastic member. Detailed implementation manners

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will describe the specific implementation manners of the present invention with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0043] To make the drawings concise, only the parts related to the invention are schematically shown in each drawing, and they do not represent the actual structure of the product as a whole. In addition, to make the drawings concise and easy to understand, for components with the same structure or function in some drawings, only one of them is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also can mean "more than one" situation, and "several" includes "two" and "more than two".

[0044] In this article, it should be noted that unless otherwise clearly stipulated and defined, the terms "install", "connect", and "join" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0045] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0046] Refer to Figures 1 to 11 , for the first embodiment of the present invention, a spot welding device for producing the inner panel assembly under the right A-pillar is proposed, including: a welding main body 1, the welding main body 1 has two spot welding heads 101, and the two spot welding heads 101 are symmetrically arranged; a base 2, the base 2 is arranged on the welding main body 1, and the base 2 has a processing channel 201; a grinding block 3, the grinding block 3 is rotatably arranged in the processing channel 201, after the grinding block 3 rotates, both ends of the grinding block 3 are used to grind the two spot welding heads 101 respectively; a clamping ring 4, the clamping ring 4 is rotatably arranged in the processing channel 201, located at one end of the grinding block 3, the inner diameter of the clamping ring 4 is larger than the diameter of the spot welding head 101, and the clamping ring 4 is used to disassemble the spot welding head 101.

[0047] In this embodiment, the welding device for large automotive components often occupies a large area. Therefore, this spot welding device integrates the functions of electrode cap cleaning, grinding and replacement and disassembly. Compared with the traditional independent setting method, the volume of the device is significantly reduced. The specific integrated functions are placed in the processing channel 201, and the grinding block 3 and the clamping ring 4 are reasonably arranged. The processing channel 201 can make both ends of the grinding block 3 grind two groups of spot welding heads 101 respectively, and the same is true for the clamping ring 4. Moreover, the inner diameter of the clamping ring 4 is large, and the spot welding head 101 can pass through it to avoid interference. When the electrode cap needs to be replaced, the clamping ring 4 can be quickly disassembled, reducing the switching time of the traditional device and the transfer time of the electrode cap.

[0048] For traditional grinding machines, firstly, they have a single function. They use a high-speed rotating grinding head to polish, and the electrode cap needs to be replaced. Also, manual labor or other equipment is required to remove the electrode cap from the spot welding head 101, which is cumbersome and time-consuming. In contrast, the clamping ring 4 of this device can directly remove the electrode cap within the processing channel 201. Secondly, various devices occupy a certain amount of space. The spot welding device itself is very large in volume and does not have much extra space to place various devices. Even if placed, it may interfere with the operation of the robotic arm 103. Through reasonable structural design, this device integrates the grinding block 3 and the clamping ring 4 within the processing channel 201 of the base 2, making the device structure more compact and the space utilization rate higher. Thirdly, when traditional grinding machines grind the electrode cap, it may be necessary to move the spot welding head 101 to a specific grinding position, or manually hold the grinding machine to grind each electrode cap individually, with relatively complex operations. The grinding block 3 of this device is rotatably arranged within the processing channel 201 and can grind the two symmetrically arranged spot welding heads 101 through simple rotation operations, with more convenient and efficient operations. In terms of electrode cap replacement, traditional methods may require complex fixtures or tools to remove the electrode cap, while the clamping ring 4 of this device can easily remove the electrode cap through its specific inner diameter design and rotational setting, reducing the labor intensity and operation difficulty of the operator.

[0049] Working process:

[0050] 1. Welding stage: During the production process of the right A-pillar inner lower panel assembly, the robotic arm 103 of the welding main body 1 drives the two spot welding heads 101 to perform spot welding operations on the workpieces clamped by the fixture group 102 according to the predetermined welding procedures and parameters. Since there are too many solder joint positions on the right A-pillar inner lower panel, the fixtures of some fixture groups 102 may interfere with the welding of the spot welding heads 101, and even the operation of the robotic arm 103 may be interfered by some fixtures. Therefore, the fixture group 102 usually has two working positions. As Figure 1 shown, when in the first working position, some solder joint positions are welded first. Some solder joint positions may be welded halfway in the clamped and unclamped states because the fixture blocks some solder joint positions. When in the second working position, similarly, the remaining solder joint positions are welded. During this process, the grinding block 3 and the clamping ring 4 within the processing channel 201 of the base 2 are in a non-working state and do not affect the normal welding operation of the spot welding heads 101.

[0051] 2. Electrode cap grinding stage: When the electrode cap has been used for a period of time and the welding spatter, welding slag, and oxides accumulated on its surface reach the level that needs to be cleaned and ground (the thickness of the spatter reaches about 0.5 - 1 mm), the robotic arm 103 moves the spot welding head 101 to the corresponding position above the processing channel 201 of the base 2. Then, the grinding block 3 starts to rotate under the action of a driving device (such as a motor, etc., which can be set at the bottom of the base 2 or connected to the base 2) or other driving devices. Since the two ends of the grinding block 3 can respectively correspond to the two spot welding heads 101 after rotation, by precisely controlling parameters such as the rotation speed, rotation time, and contact pressure between the grinding block 3 and the spot welding head 101, the surface of the electrode cap is polished and cleaned to remove the surface impurities and restore the good electrical conductivity and shape of the electrode cap to ensure the subsequent welding quality.

[0052] 3. Electrode cap replacement stage: When the electrode cap is severely worn or damaged and needs to be replaced, the robotic arm 103 moves the spot welding head 101 to a suitable position above the processing channel 201 again. At this time, the clamping ring 4 is activated to clamp the electrode cap, and using a corresponding driving mechanism (such as a rotary cylinder, pneumatic drive, etc.), the spot welding head 101 rotates relative to the electrode cap on it to complete the disassembly. After the disassembly is completed, a new electrode cap can be installed on the spot welding head 101 through manual or automated feeding devices, and then the clamping ring 4 returns to its initial non-working position to prepare for the next electrode cap disassembly operation. During the entire working process, the action conversion and coordinated work between various components can be precisely controlled through a control system (such as a PLC control system) to ensure the smooth progress of each link.

[0053] The available forms for the clamping ring 4 to clamp the electrode cap are, for example, elastic claw type disassembly. Multiple elastic claws are provided on the inner wall of the clamping ring 4. In the initial state, the elastic claws are in a contracted state, and their inner diameter is slightly larger than the diameter of the spot welding head 101. When the spot welding head 101 drives the electrode cap into the clamping ring 4, the clamping ring 4 uses an external mechanical structure (such as a push rod connected to the elastic claw, driven by a cylinder or a motor to move the push rod, or using centrifugal force) to expand the elastic claws outward. The expanded elastic claws tightly clamp the edge or specific part of the electrode cap. And at this time, since the clamping ring 4 is rotating, the electrode cap can be smoothly disassembled from the spot welding head 101; Another example is that the clamping ring 4 can be made of a magnetic material or an electromagnetic device is provided inside. When the spot welding head 101 drives the electrode cap into the clamping ring 4, by controlling the energization of the electromagnetic device or using the magnetism of the magnetic material itself, a magnetic attraction force is generated between the clamping ring 4 and the electrode cap. At the same time, under the action of the magnetic attraction force, the clamping ring 4 is controlled to rotate. At this time, the electrode cap overcomes the connection force with the spot welding head 101 and rotates relative to it, thereby realizing the disassembly of the electrode cap.

[0054] Furthermore, both ends of the grinding block 3 have concave conical surfaces 301. After the grinding block 3 rotates, the two concave conical surfaces 301 are used to grind the two spot welding heads 101 respectively.

[0055] In this embodiment, in order to ensure that both ends of the rotating grinding block 3 can accurately grind the arc-shaped spot welding heads 101, the concave conical surfaces 301 are provided, which can be closely adapted to the outer shape of the spot welding heads 101. During the rotating grinding process, the concave conical surfaces 301 can evenly contact all parts of the spot welding heads 101. This accuracy helps to restore the standard shape of the spot welding heads 101, ensure the consistency of the size, depth and quality of each solder joint, and reduce welding defects caused by the irregular shape of the spot welding heads 101, such as false welding, welding through and other problems.

[0056] The material of the grinding block 3 must have high hardness, high wear resistance, thermal stability and a certain degree of toughness. Therefore, cemented carbide materials, such as tungsten carbide (WC)-based cemented carbide, can be selected, which can withstand high-speed friction and wear with the electrode cap, and still maintain high hardness and strength at high temperatures, and are not prone to softening or deformation. To ensure toughness, a cemented carbide with a binder such as cobalt (Co) needs to be added, and the content can generally be controlled between 3% and 15% to prevent cracking due to impact or vibration during the grinding process.

[0057] The angle of the concave conical surface 301 should be designed according to the shape and grinding requirements of the spot welding head 101. Generally speaking, for common conical or frustum-shaped spot welding heads 101, the cone angle of the concave conical surface 301 can be selected between 60° and 120°. For example, if the cone angle of the spot welding head 101 is small (close to 60°), the cone angle of the concave conical surface 301 of the grinding block 3 can be selected to be relatively small, such as 70° - 80°, so as to better fit the surface of the spot welding head 101 and achieve more refined grinding; and the overall size of the grinding block 3 should match the size of the processing channel 201 and the spot welding head 101. Its length should ensure that it can fully cover the parts of the spot welding head 101 that need to be ground during rotation, generally between 50 - 250 mm. The width and height should be appropriate, which should not only ensure sufficient mass and strength to withstand the grinding force, but also be able to rotate flexibly in the processing channel 201.

[0058] Furthermore, the grinding block 3 is cylindrical, and an avoidance hole 302 is also provided at the central axis position of the grinding block 3. The two concave conical surfaces 301 are respectively located at both ends of the avoidance hole 302, and the two concave conical surfaces 301 are symmetrically arranged.

[0059] In this embodiment, the grinding block 3 is designed as a cylinder with a relief hole 302, which can effectively reduce its own weight, enabling easy start-up, stop, and control of the rotation speed and direction of the grinding block 3, reducing power consumption, and also lowering the requirements for the power and torque of the driving device. At the same time, it provides a heat dissipation channel for the heat generated during the grinding process, increases air circulation, avoids certain positions close to the spot welding head 101, and provides a place for the removed impurities. The structure with two symmetrically arranged concave conical surfaces 301 located at both ends of the relief hole 302 enables the grinding block 3 to distribute the grinding pressure more evenly on the surface of the electrode cap when contacting and grinding the spot welding head 101.

[0060] Furthermore, the grinding block 3 also has a notch 303 that extends from the outer wall of the grinding block 3 to the relief hole 302, and a cutting and grinding line 304 is provided at the edge position of the notch 303.

[0061] In this embodiment, the design of the notch 303 and the cutting and grinding line 304 greatly enhances the adaptability of the grinding block 3 to different wear conditions of the electrode cap. In actual use, the wear of the electrode cap may not be evenly distributed, and there may be local protrusions, depressions, or irregular shapes on its surface. When the grinding block 3 rotates, the cutting and grinding line 304 at the edge of the notch 303 can first contact these abnormal parts on the electrode cap, and through its sharp cutting action, quickly remove the protrusions on the surface of the electrode cap or repair the depressed areas, ensuring that the entire surface of the electrode cap can be effectively ground.

[0062] At the same time, the notch 303 of the grinding block 3 also provides a discharge channel for the debris. When the grinding block 3 rotates, under the action of centrifugal force and air flow, the debris can be discharged from the grinding area along the notch 303, avoiding the accumulation of debris between the grinding block 3 and the electrode cap.

[0063] Furthermore, the processing channel 201 is cylindrical, and the axial direction of the processing channel 201, the rotation axial direction of the grinding block 3, and the rotation axial direction of the clamping ring 4 are collinear. There are two clamping rings 4, and the two clamping rings 4 are respectively located at both ends of the grinding block 3.

[0064] In this embodiment, the cylindrical processing channel 201 and the collinear component layout make the structure of the entire device more compact and reasonable. The components are arranged in an orderly manner in the axial direction, reducing the occupancy of the lateral space, enabling the spot welding device to be more efficiently arranged in a limited production site, and enabling rapid switching on the same axial path. When the grinding is completed, without complex adjustment or movement, the clamping ring 4 can directly enter the working position to disassemble the electrode cap.

[0065] Furthermore, both ends of the processing channel 201 have openings 202, and the two clamping rings 4 are respectively located at the two openings 202.

[0066] In this embodiment, since the spot welding head 101 has a certain length, the processing channel 201 and the grinding block 3 are similar, so the layout of the clamping ring 44 at the opening 202 makes it convenient for the clamping ring 4 to clamp and disassemble the electrode cap away from the arc welding end, making it easier for the electrode cap and the spot welding head 101 to rotate relative to each other and disassemble smoothly.

[0067] Furthermore, the base 2 also has three annular air paths 203 and an air inlet duct 204, which are all connected to the processing channel 201, and the two clamping rings 4 and the grinding block 3 respectively pass through the three annular air paths 203, and also includes: a plurality of convex plates 5, and a plurality of convex plates 5 are arranged around the clamping ring 4 and the grinding block 3, and the convex plates 5 are used to withstand wind force and drive the clamping ring 4 and the grinding block 3 to rotate.

[0068] In this embodiment, the driving method of the annular air path 203 and the convex plate 5 is adopted, and there is no need for complex mechanical transmission mechanisms, such as gears, chains or complex motor-driven shaft systems. The entire driving system is composed of only the air inlet 204, the annular air path 203 and the convex plates 5 arranged around the clamping ring 4 and the grinding block 3. The structure is simple and clear, which avoids direct friction and wear between components and occupies a small space. It is convenient to control the gas flow, pressure and other parameters of the air inlet 204 through the air pump, and the wind force acting on the convex plate 5 can be accurately adjusted, thereby achieving precise control of the rotation speed, rotation direction and start and stop of the clamping ring 4 and the grinding block 3. For example, the grinding block 3 can be rotated at high speed for grinding and the clamping ring 4 can be clamped and rotated for disassembly, thereby realizing layout and installation in a limited space. Compared with hydraulic drive, it occupies less space and only requires an air source and a simple air path pipeline to complete the action.

[0069] At the same time, during the rotation of the clamping ring 4 and the grinding block 3, the gas can also take away some of the generated heat, especially the large amount of friction heat generated by the grinding block 3 when grinding the electrode cap. This air-cooling heat dissipation effect helps to reduce the temperature of the components.

[0070] Grinding process: The control system opens the air inlet 204 and adjusts the gas flow and pressure to appropriate parameter values according to the preset program or the electrode cap status information fed back by the sensor. The high-pressure gas enters the annular gas path 203 through the air inlet 204 and forms an airflow in the processing channel 201. The airflow acts on the convex plates 5 around the grinding block 3, so that the convex plates 5 generate torque after being subjected to wind force. Under the action of the torque, the grinding block 3 starts to rotate at high speed to complete the grinding. At this time, since the clamping function of the clamping ring 4 is not turned on and the inner diameter is larger than the diameter of the spot welding head 101, even if the clamping ring 4 is rotating under the action of wind force and the convex plates 5, it does not act on the electrode cap, and the grinding process proceeds normally.

[0071] The disassembly process is the same. Only need to activate the clamping function of the clamping ring 4 in the above process, and the spot welding head 101 does not contact the grinding block 3, then the disassembly can be completed.

[0072] Finally, when the grinding or disassembly operation is completed, the control system closes the air inlet 204. The clamping ring 4 and the grinding block 3 gradually stop rotating under the action of their own inertia and air flow resistance, and return to the initial static position, waiting for the next work instruction.

[0073] Furthermore, the inner wall of the clamping ring 4 has a plurality of installation grooves 401, and the plurality of installation grooves 401 are arranged in a circumferential direction around the clamping ring 4. It also includes: a clamping block 6, the clamping block 6 is movably arranged in the installation groove 401, and after the clamping block 6 moves, it extends into or out of the installation groove 401, and the moving direction of the clamping block 6 is arranged along the radial direction of the clamping ring 4; an elastic member 7, the elastic member 7 is arranged in the installation groove 401, one end is connected to the clamping block 6, and the other end is connected to the clamping ring 4, and the elastic member 7 provides a force for the clamping block 6 to extend out of the installation groove 401, and the clamping ring 4 drives the clamping block 6 to move after rotating.

[0074] In this embodiment, in the initial state, when the electrode cap disassembly operation is not performed, the elastic member 7 is in a natural extended state, and the clamping block 6 is partially pushed out of the installation groove 401, so that the clamping block 6 slightly extends out of the inner wall of the clamping ring 4 by a certain distance; then, during grinding, due to the centrifugal force generated by the high-speed rotation, the clamping block 6 extends into the installation groove 401, avoiding the spot welding head 101, and enabling it to pass through the clamping ring 4 and contact the grinding block 3 to complete grinding. Even without centrifugal force, the spot welding head 101 can also be driven by the robotic arm 103 to push open a plurality of clamping blocks 6 and pass through the clamping ring 4.

[0075] Although pneumatic rotation is required to disassemble the electrode cap, the generated centrifugal force will cancel the clamping function of the clamping ring 4, that is, the high-speed rotation makes the clamping block 6 extend into the installation groove 401, but at this time, high rotational speed does not need to be guaranteed, because high rotational speed is for the grinding block 3 to grind the electrode cap. Therefore, during disassembly, the air pressure or air flow can be reduced to weaken the centrifugal force, so as to ensure that the elastic member 7 overcomes the centrifugal force, enabling a plurality of clamping blocks 6 to slowly and stably clamp the surface of the electrode cap and drive it to rotate relative to the spot welding head 101, thereby completing the disassembly.

[0076] The selection of this clamping function is coordinated with the air circuit control to smoothly complete the switching between the grinding and disassembly functions, avoiding the complex steps of traditional fixtures, greatly improving the automation level of the whole process, and improving the success rate and reliability of the electrode cap disassembly operation.

[0077] Furthermore, the welding main body 1 includes: a fixture group 102 and a robotic arm 103, the robotic arm 103 is arranged on one side of the fixture group 102, the end of the robotic arm 103 has two spot welding heads 101, and the base 2 is arranged on the fixture group 102.

[0078] Furthermore, the base 2 is rotatably arranged on the fixture group 102, and the rotation axis of the base 2 is perpendicular to the rotation axis of the grinding block 3.

[0079] In this embodiment, the base 2 rotates on the fixture group 102 through a motor at the bottom, and the rotation axis is perpendicular to the rotation axis of the grinding block 3, so as to adapt to grinding and disassembly in more occasions, meet the angle requirements of various occasions, and avoid interference.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A spot welding device for the production of the inner panel assembly under the right A-pillar, characterized in that, Comprising: A welding body (1), the welding body (1) having two spot welding heads (101), and the two spot welding heads (101) being symmetrically arranged; A base (2), the base (2) being arranged on the welding body (1), and the base (2) having a processing channel (201); A grinding block (3), the grinding block (3) being rotatably arranged in the processing channel (201), and after the grinding block (3) rotates, both ends of the grinding block (3) are used for grinding the two spot welding heads (101) respectively; A clamping ring (4), the clamping ring (4) being rotatably arranged in the processing channel (201), located at one end of the grinding block (3), the inner diameter of the clamping ring (4) being larger than the diameter of the spot welding head (101), and the clamping ring (4) being used for disassembling the spot welding head (101); Both ends of the grinding block (3) have concave conical surfaces (301), and after the grinding block (3) rotates, the two concave conical surfaces (301) are used for grinding the two spot welding heads (101) respectively; The processing channel (201) is cylindrical, and the axial direction of the processing channel (201), the rotation axial direction of the grinding block (3), and the rotation axial direction of the clamping ring (4) are collinear, and there are two clamping rings (4), and the two clamping rings (4) are respectively located at both ends of the grinding block (3); The inner wall of the clamping ring (4) has a plurality of mounting grooves (401), and the plurality of mounting grooves (401) are arranged in a circumferential arrangement around the clamping ring (4). Further comprising: A clamping block (6), the clamping block (6) being movably arranged in the mounting groove (401), and after the clamping block (6) moves, it extends into or out of the mounting groove (401), and the moving direction of the clamping block (6) is arranged along the radial direction of the clamping ring (4); An elastic member (7), the elastic member (7) being arranged in the mounting groove (401), one end being connected to the clamping block (6) and the other end being connected to the clamping ring (4), the elastic member (7) providing a force for the clamping block (6) to extend out of the mounting groove (401), and the clamping ring (4) drives the clamping block (6) to move after rotating.

2. The spot welding device for producing the right A-pillar lower inner panel assembly according to claim 1, characterized in that, The grinding block (3) is cylindrical, and an avoidance hole (302) is further provided at the central axis position of the grinding block (3), the two concave conical surfaces (301) are respectively located at both ends of the avoidance hole (302), and the two concave conical surfaces (301) are symmetrically arranged.

3. A spot welding device for producing the right inner A-pillar lower panel assembly according to claim 2, characterized in that, The grinding block (3) further has a notch (303), the notch (303) extending from the outer wall of the grinding block (3) to the avoidance hole (302), and a cutting and grinding line (304) is provided at the edge position of the notch (303).

4. A spot welding device for producing a right A-pillar inner panel assembly according to claim 1, characterized in that, Both ends of the processing channel (201) have openings (202), and the two clamping rings (4) are respectively located at the two openings (202).

5. A spot welding device for the production of the right A-pillar inner panel assembly according to claim 1, characterized in that, The base (2) further has three annular air passages (203) and an air inlet passage (204). The three annular air passages (203) and the air inlet passage (204) are all connected to the processing passage (201), and the two clamping rings (4) and the grinding block (3) respectively penetrate through the three annular air passages (203). Further included are: A plurality of convex plates (5). A plurality of the convex plates (5) are provided around the clamping ring (4) and the grinding block (3). The convex plates (5) are used to withstand the wind force and drive the clamping ring (4) and the grinding block (3) to rotate.

6. A spot welding device for producing a right A-pillar lower inner panel assembly according to claim 1, characterized in that, The welding main body (1) includes: A fixture group (102) and a robotic arm (103). The robotic arm (103) is arranged on one side of the fixture group (102). Two spot welding heads (101) are provided at the end of the robotic arm (103). The base (2) is arranged on the fixture group (102).

7. A spot welding device for producing the right inner A-pillar lower panel assembly according to claim 6, characterized in that, The base (2) is rotatably arranged on the fixture group (102), and the rotation axis of the base (2) is perpendicular to the rotation axis of the grinding block (3).

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