Spot welding device for right A column lower inner plate assembly production

Abstract

The invention relates to the technical field of spot welding devices, and provides a spot welding device for right A column lower inner plate assembly production, which comprises a welding main body provided with two spot welding heads, and the two spot welding heads are symmetrically arranged; the base is arranged on the welding body and provided with a processing channel. The coping block is rotationally arranged in the treatment channel, and after the coping block rotates, the two ends of the coping block are used for coping the two spot welding heads correspondingly; the clamping ring is rotationally arranged in the processing channel and located at one end of the coping block, the inner diameter of the clamping ring is larger than the diameter of the spot welding head, and the clamping ring is used for disassembling the spot welding head. By means of the technical scheme, the problem that in the prior art, the cleaning and grinding function and the replacement and disassembly function of the electrode cap are arranged separately and occupy the space of the device, and consequently the device cannot be simplified and shrunk is solved.

Description

Technical Field

[0001] The invention relates to the technical field of spot welding devices, and in particular to a spot welding device for producing a right A-pillar lower inner panel assembly. Background Art

[0002] In automobile manufacturing, the safety and integrity of the body structure are of vital importance. As a key component of the body frame, the quality of the finished product of the right A-pillar lower inner panel assembly will directly affect the structural strength and safety performance of the entire vehicle. However, due to its complex processing location, the traditional manual spot welding method has many limitations in the production process of this component.

[0003] With the current development of robot spot welding and the increasing requirements for production quality and efficiency of the right A-pillar lower inner panel assembly, a high-precision, high-reliability fixture group is used in conjunction with the robot spot welding device to ensure that the welding operation of each weld point is completed quickly and meets strict quality standards.

[0004] Spot welding generally requires the use of an electrode cap. 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 speaking, when the thickness of the spatter on the surface of the electrode cap reaches about 0.5-1mm, it needs to be cleaned. At the same time, in order to ensure the welding quality, the electrode cap needs to be replaced regularly or cleaned and ground. However, the cleaning and grinding and replacement and disassembly devices of the electrode cap on the spot welding device are independently arranged. The two devices each occupy the space of the equipment, resulting in low space utilization of the equipment, which is not conducive to reducing the size of the equipment. Summary of the invention

[0005] The present invention proposes a spot welding device for producing a right A-pillar lower inner panel assembly, which solves the problem in the related art that the electrode cap cleaning and grinding function and the replacement and disassembly function are separately set, each occupying the space of the equipment, resulting in the equipment being unable to be simplified and reduced.

[0006] The technical solution of the present invention is as follows: A spot welding device for producing a right A-pillar lower inner panel assembly, comprising: A welding body, wherein the welding body has two spot welding heads, and the two spot welding heads are symmetrically arranged; A base, the base is arranged on the welding body, and the base has a processing channel; A grinding block, wherein the grinding block is rotatably disposed in the processing channel, and after the grinding block rotates, two ends of the grinding block are used to grind the two spot welding heads respectively; A clamping ring is rotatably disposed 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. The clamping ring is used to disassemble the spot welding head.

[0007] As a further technical solution, both ends of the grinding block have concave cone surfaces. After the grinding block rotates, the two concave cone surfaces are used to grind the two spot welding heads respectively.

[0008] As a further technical solution, the grinding block is cylindrical, and a avoidance hole is provided at the central axis position of the grinding block, and the two concave cone surfaces are respectively located at two ends of the avoidance hole, and the two concave cone surfaces are symmetrically arranged.

[0009] As a further technical solution, the grinding block further has a notch, the notch extends from the outer wall of the grinding block to the avoidance hole, and a cutting grinding line is provided at the edge of the notch.

[0010] As a further technical solution, the processing channel is cylindrical, and the axial direction of the processing channel, the rotation axis of the grinding block and the rotation axis of the clamping ring are arranged in a colinear manner, and there are two clamping rings, which are respectively located at both ends of the grinding block.

[0011] 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.

[0012] As a further technical solution, the base further has three annular gas paths and an air inlet, the three annular gas paths and the air inlet are all connected to the processing channel, and the two clamping rings and the grinding block respectively penetrate the three annular gas paths, and also includes: A plurality of convex plates are arranged around the clamping ring and the grinding block, and the convex plates are used to withstand wind force and drive the clamping ring and the grinding block to rotate.

[0013] As a further technical solution, the inner wall of the clamping ring has a plurality of mounting grooves, and the plurality of mounting grooves are arranged along the circumference of the clamping ring, and further includes: A clamping block, wherein the clamping block is movably arranged in the mounting groove, and the clamping block extends into or out of the mounting groove after movement, and the moving direction of the clamping block is arranged along the radial direction of the clamping ring; An elastic member is arranged in the installation groove, one end of which is connected to the clamping block and the other end is connected to the clamping ring. The elastic member provides force for the clamping block to extend out of the installation groove, and the clamping ring drives the clamping block to move after rotating.

[0014] As a further technical solution, the welding body comprises: A fixture group and a mechanical arm, wherein the mechanical arm is arranged at one side of the fixture group, the end of the mechanical arm is provided with two spot welding heads, and the base is arranged on the fixture group.

[0015] 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.

[0016] The working principle and beneficial effects of the present invention are: 1. Improve space utilization: Because welding devices for large automotive parts have the common problem of occupying a large area, this spot welding device integrates the cleaning, grinding and replacement and disassembly functions of the electrode cap. Compared with the traditional spot welding device where the two are set separately, it greatly reduces the overall volume of the equipment, makes the production line layout more compact and reasonable, improves the space utilization of the production site, and saves valuable production space resources for the enterprise.

[0017] 2. Improve production efficiency: The integrated function is specifically configured in the base on the welding body. The processing channel opened therein cleverly arranges the grinding block and the clamping ring, so that the grinding and replacement operations of the electrode cap can be quickly switched on the same device. Since the welding of such parts is usually completed by two sets of spot welding heads arranged symmetrically, the electrode caps on both need to be cleaned or disassembled, so a processing channel is opened instead of a processing groove, and the inner diameter of the clamping ring is larger than the diameter of the spot welding head to avoid the clamping ring on one side of the grinding block interfering with the spot welding head close to the grinding block. The spot welding head can pass through the clamping ring and contact the end of the grinding block for cleaning and grinding.

[0018] When the electrode cap reaches the replacement condition, the clamping ring can quickly remove it. This integrated design reduces the time consumed by device switching and electrode cap transfer in the traditional method, thereby improving the production efficiency of the right A-pillar lower inner panel assembly, enabling the company to produce more qualified products per unit time and enhancing the company's market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0020] Figure 1 It is a schematic structural diagram of a spot welding device for producing a right A-pillar lower inner panel assembly in the present invention; Figure 2 For the present invention Figure 1 Enlarged view of part A in the middle; Figure 3 For the present invention Figure 1 Enlarged view of middle part B; Figure 4 For the present invention Figure 3 Enlarged view of middle C; Figure 5 It is a schematic diagram of the structure of the grinding block in the present invention; Figure 6It is a schematic diagram of the structure of the clamping ring in the present invention; Figure 7 For the present invention Figure 6 Enlarged view of the middle D part; Figure 8 A partial cross-sectional view of the position of the grinding block in the base of the present invention; Fig. 9 For the present invention Figure 8 Enlarged view of middle E part; Fig.10 A partial cross-sectional view of the position of the clamping ring in the base of the present invention; Fig.11 For the present invention Fig.10 Enlarged view of part F in the middle.

[0021] In the figure: 1. welding 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, 3. grinding block, 301. concave cone surface, 302. avoidance hole, 303. notch, 304. cutting and grinding line, 4. clamping ring, 401. mounting groove, 5. convex plate, 6. clamping block, 7. elastic member. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0023] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0024] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] Reference Figure 1 to Figure 11 , which is the first embodiment of the present invention, proposes a spot welding device for the production of the lower inner panel assembly of the right A-pillar, comprising: a welding body 1, the welding 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 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, the two 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.

[0027] In this embodiment, the welding device for large automobile parts often occupies a large area, so this spot welding device integrates the functions of cleaning, grinding, replacing and disassembling the electrode cap. Compared with the traditional independent setting method, the volume of the equipment 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 the two ends of the grinding block 3 be ground by two groups of spot welding heads 101, and the clamping ring 4 is the same. The inner diameter of the clamping ring 4 is large, and the spot welding head 101 can pass through 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.

[0028] The conventional grinding machine, firstly, has a single function, and uses a high-speed rotating grinding head for grinding. The electrode cap needs to be replaced, and the electrode cap needs to be removed from the spot welding head 101 manually or with the help of other equipment. The operation is cumbersome and time-consuming. The clamping ring 4 of the present device can directly disassemble the electrode cap in the processing channel 201; secondly, various types of equipment occupy a certain space, and the spot welding device itself is very large, and there is not much space left to place various types of equipment. Even if it is placed, it may hinder the operation of the robot arm 103. The present device integrates the grinding block 3 and the clamping ring 4 in the processing channel 201 of the base 2 through a reasonable structural design, making the device structure more compact and the space utilization rate higher; In addition, when a traditional grinder is grinding an electrode cap, it may be necessary to move the spot welding head 101 to a specific grinding position, or a manual handheld grinder may be used to grind each electrode cap individually, and the operation is relatively complicated. The grinding block 3 of the present device is rotatably arranged in the processing channel 201, and the two symmetrically arranged spot welding heads 101 can be ground by a simple rotation operation, which is more convenient and efficient. In terms of electrode cap replacement, the traditional method may require complex clamps or tools to remove the electrode cap, while the clamping ring 4 of the present device can easily realize the removal of the electrode cap through its specific inner diameter design and rotation setting, thereby reducing the labor intensity and operation difficulty of the operator.

[0029] Working process: 1. Welding stage: During the production process of the right A-pillar lower inner panel assembly, the robot arm 103 of the welding body 1 drives the two spot welding heads 101 to perform spot welding operations on the workpiece clamped in the fixture group 102 according to the predetermined welding procedures and parameters. Since there are too many welding spots on the right A-pillar lower inner panel, some fixtures of the fixture group 102 may hinder the welding of the spot welding head 101, and even the operation of the robot arm 103 may be hindered by some fixtures. Therefore, the fixture group 102 usually has two workstations, such as Figure 1 As shown, when in the first station, some welding points are welded first, and some welding points may be welded half in the clamped and unclamped states because the clamp blocks some welding points. When in the second station, similarly, the remaining welding points are welded. During this process, the grinding block 3 and the clamping ring 4 in the processing channel 201 of the base 2 are in a non-working state, which does not affect the normal welding action of the spot welding head 101.

[0030] 2. Electrode cap grinding stage: When the electrode cap has been used for a period of time and the welding spatter, welding slag and oxide accumulated on its surface reach the level that needs to be cleaned and ground (the spatter thickness reaches about 0.5-1mm), the robot 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 correspond to the two spot welding heads 101 respectively after the rotation, the surface of the electrode cap is polished and cleaned by accurately controlling the rotation speed, rotation time and contact pressure between the grinding block 3 and the spot welding head 101, the impurities on the surface are removed, and the good conductivity and shape of the electrode cap are restored to ensure the subsequent welding quality.

[0031] 3. Electrode cap replacement stage: When the electrode cap is severely worn or damaged and needs to be replaced, the robot arm 103 moves the spot welding head 101 to a suitable position above the processing channel 201 again. At this time, start the clamping ring 4 to clamp the electrode cap, and use the corresponding driving mechanism (such as a rotary cylinder, air circuit drive, etc.) to make the spot welding head 101 and the electrode cap thereon rotate relative to each other to complete the disassembly. After the disassembly is completed, the new electrode cap can be installed on the spot welding head 101 through a manual or automated loading device, and then the clamping ring 4 returns to the initial non-working position to prepare for the next electrode cap disassembly operation. During the entire working process, the action conversion and collaborative work between the various components can be precisely controlled by a control system (such as a PLC control system) to ensure the smooth progress of each link.

[0032] The clamping ring 4 can be used in a form of clamping the electrode cap, for example, elastic claw type disassembly, where a plurality of elastic claws are arranged 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 to extend into the clamping ring 4, the clamping ring 4 expands the elastic claws outward through an external mechanical structure (such as a push rod connected to the elastic claws, driven by a cylinder or a motor to drive the push rod to move, or by using centrifugal force). 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 removed from the spot welding head 101; for another example, the clamping ring 4 can be made of magnetic material or an electromagnetic device can be arranged inside. When the spot welding head 101 drives the electrode cap to extend into the clamping ring 4, a magnetic attraction is generated between the clamping ring 4 and the electrode cap by controlling the power supply of the electromagnetic device or utilizing the magnetism of the magnetic material itself. At the same time, the clamping ring 4 is controlled to rotate under the action of the magnetic attraction. At this time, the electrode cap overcomes the connection force between the spot welding head 101 and rotates relative to it, thereby realizing the removal of the electrode cap.

[0033] Furthermore, both ends of the grinding block 3 have concave cone surfaces 301 . After the grinding block 3 rotates, the two concave cone surfaces 301 are used to grind the two spot welding heads 101 respectively.

[0034] In this embodiment, in order to ensure that both ends of the rotating grinding block 3 can accurately grind the arc surface of the spot welding head 101, a concave cone surface 301 is provided, which can closely fit the shape of the spot welding head 101. During the rotational grinding process, the concave cone surface 301 can evenly contact various parts of the spot welding head 101. This accuracy helps to restore the standard shape of the spot welding head 101, ensure the consistency of the size, depth and quality of each weld, and reduce welding defects caused by the irregular shape of the spot welding head 101, such as cold welding, welding penetration and other problems.

[0035] The material of the grinding block 3 must have high hardness, high wear resistance, thermal stability and certain toughness, so cemented carbide material can be selected, such as tungsten carbide (WC) based cemented carbide, which can withstand high-speed friction and wear between the electrode cap, can still maintain high hardness and strength at high temperatures, is not easy to soften or deform, and ensures toughness. It is necessary to add cemented carbide with binders such as cobalt (Co), and the content can generally be controlled between 3% and 15% to prevent breakage due to impact or vibration during the grinding process.

[0036] The angle of the concave cone 301 should be designed according to the shape and grinding requirements of the spot welding head 101. Generally speaking, for common conical or truncated cone spot welding heads 101, the cone angle of the concave cone 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 cone 301 of the grinding block 3 can be selected to be a relatively small value, such as 70°-80°, so that it can better fit the surface of the spot welding head 101 and achieve more precise 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 part of the spot welding head 101 that needs to be ground during the rotation process, which can generally be between 50-250mm. The width and height should be moderate, ensuring that there is sufficient quality and strength to withstand the grinding force, and that it can be flexibly rotated in the processing channel 201.

[0037] Furthermore, the grinding block 3 is cylindrical, and has an avoidance hole 302 at the central axis of the grinding block 3 . Two concave cone surfaces 301 are respectively located at two ends of the avoidance hole 302 , and the two concave cone surfaces 301 are symmetrically arranged.

[0038] In this embodiment, the grinding block 3 is designed to be cylindrical and has an avoidance hole 302, which can effectively reduce its own weight, realize easy starting, stopping and control of the rotation speed and direction of the grinding block 3, reduce power consumption, and also reduce the requirements for the power and torque of the driving device. It also provides a 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 impurities that are ground away; and the two symmetrically arranged concave cones 301 are respectively located at the two ends of the avoidance hole 302, so that when the grinding block 3 contacts the spot welding head 101 for grinding, it can more evenly distribute the grinding pressure on the surface of the electrode cap.

[0039] Furthermore, the grinding block 3 also has a notch 303 , which extends from the outer wall of the grinding block 3 to the avoidance hole 302 , and a cutting grinding line 304 is provided at the edge of the notch 303 .

[0040] 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 area, ensuring that the entire surface of the electrode cap can be effectively ground.

[0041] At the same time, the notch 303 of the grinding block 3 also provides a discharge channel for debris. When the grinding block 3 rotates, under the action of centrifugal force and airflow, 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.

[0042] Furthermore, the processing channel 201 is cylindrical, and the axial direction of the processing channel 201, the rotational axis of the grinding block 3 and the rotational axis of the clamping ring 4 are arranged in a colinear manner, and there are two clamping rings 4, which are respectively located at both ends of the grinding block 3.

[0043] 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 occupation of the lateral space, so that the spot welding device can be more efficiently laid out in a limited production site, and can achieve rapid switching on the same axial path. After the grinding is completed, the clamping ring 4 can directly enter the working position to remove the electrode cap without complicated adjustment or movement.

[0044] 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 .

[0045] 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, and it is easier to make the electrode cap and the spot welding head 101 rotate relative to each other for smooth disassembly.

[0046] 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 penetrate the three annular air paths 203, and also include: 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.

[0047] In the present embodiment, the driving mode 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 drive shaft systems. The entire driving system is only composed of 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, so as to realize the precise control of the rotation speed, rotation direction and start and stop of the clamping ring 4 and the grinding block 3, such as making the grinding block 3 rotate at high speed for grinding and the clamping ring 4 clamping and rotating for disassembly, so as to realize 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.

[0048] At the same time, during the rotation of the clamping ring 4 and the grinding block 3, the gas can also take away part of the generated heat, especially for 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.

[0049] 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.

[0050] The disassembly process is similar. It is only necessary to activate the clamping function of the clamping ring 4 during the above process, and the spot welding head 101 is not in contact with the grinding block 3, so that the disassembly can be completed.

[0051] Finally, when the grinding or disassembly operation is completed, the control system closes the air inlet 204, and the clamping ring 4 and the grinding block 3 gradually stop rotating due to their own inertia and airflow resistance, and return to the initial static position, waiting for the next work instruction.

[0052] Furthermore, the inner wall of the clamping ring 4 has a plurality of mounting grooves 401, and the plurality of mounting grooves 401 are arranged along the circumference of the clamping ring 4, and also includes: a clamping block 6, which is movably arranged in the mounting groove 401, and the clamping block 6 extends into or out of the mounting groove 401 after moving, and the moving direction of the clamping block 6 is arranged radially along the clamping ring 4; an elastic member 7, which is arranged in the mounting groove 401, one end of which is connected to the clamping block 6, and the other end of which 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 mounting groove 401, and the clamping ring 4 drives the clamping block 6 to move after rotating.

[0053] In this embodiment, in the initial state, when the electrode cap is not removed, the elastic member 7 is in a naturally stretched state, and the clamping block 6 is partially pushed out of the mounting groove 401, so that the clamping block 6 slightly extends out of the inner wall of the clamping ring 4 by a certain distance; thereafter, grinding is performed, and due to the centrifugal force generated by the high-speed rotation, the clamping block 6 extends into the mounting groove 401, avoiding the spot welding head 101, so that it passes through the clamping ring 4 and contacts the grinding block 3 to complete the grinding. Even without centrifugal force, the spot welding head 101 can squeeze open several clamping blocks 6 and pass through the clamping ring 4 under the drive of the mechanical arm 103.

[0054] Although pneumatic rotation is required to remove the electrode cap, the centrifugal force generated will cancel the clamping function of the clamping ring 4, that is, high-speed rotation causes the clamping block 6 to extend into the mounting groove 401, but at this time there is no need to ensure a high rotation speed, because the high rotation speed is for the grinding block 3 to grind the electrode cap. Therefore, the air pressure or airflow can be reduced during disassembly to weaken the centrifugal force to ensure that the elastic member 7 overcomes the centrifugal force, so that several clamping blocks 6 slowly and stably clamp the surface of the column electrode cap and drive it to rotate relative to the spot welding head 101, thereby completing the disassembly.

[0055] 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 complicated steps of traditional clamps, greatly improving the automation level of the entire process, and improving the success rate and reliability of the electrode cap disassembly operation.

[0056] Furthermore, the welding body 1 comprises: a fixture group 102 and a robot arm 103 . The robot arm 103 is arranged at one side of the fixture group 102 . The end of the robot arm 103 has two spot welding heads 101 . The base 2 is arranged on the fixture group 102 .

[0057] Furthermore, the base 2 is rotatably disposed on the fixture assembly 102 , and the rotation axis of the base 2 is perpendicular to the rotation axis of the grinding block 3 .

[0058] In this embodiment, the base 2 is rotated on the clamp assembly 102 by a motor at the bottom, and the rotation axis is perpendicular to the rotation axis of the grinding block 3 to adapt to grinding and disassembly in more occasions, meet the angle requirements of various occasions, and avoid interference.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A spot welding device for producing the right A-pillar lower inner panel assembly, characterized in that: include: A welding body (1), the welding body (1) having two spot welding heads (101), the two spot welding heads (101) being symmetrically arranged; A base (2), the base (2) being arranged on the welding body (1), the base (2) having a processing channel (201); A grinding block (3), the grinding block (3) being rotatably disposed in the processing channel (201); after the grinding block (3) rotates, two 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) being rotatably disposed in the processing channel (201) and being 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).

2. A spot welding device for producing a right A-pillar lower inner panel assembly according to claim 1, characterized in that: Both ends of the grinding block (3) are provided with 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.

3. A spot welding device for producing a right A-pillar lower inner panel assembly according to claim 2, characterized in that: The grinding block (3) is cylindrical, and a 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 two ends of the avoidance hole (302), and the two concave conical surfaces (301) are symmetrically arranged.

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

5. A spot welding device for producing a right A-pillar lower inner panel assembly according to claim 1, characterized in that: The processing channel (201) is cylindrical, and the axial direction of the processing channel (201), the rotational axis of the grinding block (3) and the rotational axis of the clamping ring (4) are arranged in a colinear manner. There are two clamping rings (4), and the two clamping rings (4) are respectively located at two ends of the grinding block (3).

6. A spot welding device for producing a right A-pillar lower inner panel assembly according to claim 5, 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).

7. A spot welding device for producing a right A-pillar lower inner panel assembly according to claim 5, characterized in that: The base (2) further comprises three annular gas paths (203) and an air inlet (204), the three annular gas paths (203) and the air inlet (204) are all connected to the processing channel (201), and the two clamping rings (4) and the grinding block (3) respectively penetrate the three annular gas paths (203), and further comprises: A plurality of convex plates (5) are provided 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.

8. The spot welding device for producing the right A-pillar lower inner panel assembly according to claim 1, characterized in that: The inner wall of the clamping ring (4) has a plurality of mounting grooves (401), and the plurality of mounting grooves (401) are arranged along the circumference of the clamping ring (4), and further comprises: a clamping block (6), the clamping block (6) being movably arranged in the mounting groove (401), the clamping block (6) extending into or out of the mounting groove (401) after movement, and the moving direction of the clamping block (6) being arranged along the radial direction of the clamping ring (4); An elastic member (7), wherein the elastic member (7) is arranged in the mounting groove (401), one end of the elastic member (7) is connected to the clamping block (6), and the other end of the elastic member (7) is connected to the clamping ring (4), the elastic member (7) provides 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.

9. A spot welding device for producing a right A-pillar lower inner panel assembly according to claim 1, characterized in that: The welding body (1) comprises: A clamp group (102) and a mechanical arm (103), wherein the mechanical arm (103) is arranged on one side of the clamp group (102), the end of the mechanical arm (103) has two spot welding heads (101), and the base (2) is arranged on the clamp group (102).

10. A spot welding device for producing a right A-pillar lower inner panel assembly according to claim 9, characterized in that: The base (2) is rotatably arranged on the clamp assembly (102), and the rotation axis of the base (2) is perpendicular to the rotation axis of the grinding block (3).

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