Electrode cap maintenance device

Abstract

The invention discloses an electrode cap maintenance device, which is suitable for fixed welding tongs, and comprises a gear box, a grinding unit, a cap dismounting unit, a cap mounting unit and a cap dismounting unit, the reduction gearbox is connected with the gear box, the reduction gearbox comprises a power source, and the power source is in transmission connection with the grinding unit and the cap dismounting unit through the gear box; the cap supplying unit is fixedly arranged relative to the grinding unit and the cap disassembling unit, and the cap supplying unit is used for storing and supplying new electrode caps to the fixed electrode holders; and the floating displacement mechanism is connected with the reduction gearbox. According to the invention, a grinding function unit, a cap dismounting function unit and a cap supplying function unit are integrated on a single moving module composed of a gearbox and a reduction gearbox, and a floating displacement mechanism driven by a Y axis and a Z axis is utilized, so that the module can actively move and accurately align to and butt a fixed electrode holder. By means of the design, full automation of maintenance of the electrode cap of the fixed electrode holder is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and in particular to an electrode cap maintenance device. Background Art

[0002] The electrode cap is an important consumable part in resistance welding equipment and is commonly used in equipment such as single-sided spot welders, fixed spot welders, suspended spot welders, manipulator spot welders, and robot spot welders. It is usually made of chromium zirconium copper or dispersion copper and is installed on the electrode connecting rod. During the resistance welding process, a large current passes between the electrodes to generate high temperature, melting the steel plate to form a weld nugget, thereby achieving the connection of the steel plates. Due to the high welding temperature, the welding surface of the electrode cap will gradually soften, wear, and deform. Generally, after welding 30 - 50 points, it is necessary to grind and shape or replace it.

[0003] There are mainly two installation methods for the welding tongs: one is to directly fix them on the robot, and the welding tongs move with the robot to a ground-fixed grinding machine for grinding; the other is to fix the welding tongs on the ground or a support, and the robot grabs the workpiece to the position of the welding tongs for welding. During grinding, a translation or swing device fixed beside the welding tongs sends the grinding machine body to the opening position of the welding tongs.

[0004] The currently fixed welding tongs on the ground or support face the following problems when changing the cap: one is that workers need to enter the welding fence to manually replace the electrode cap (the production line needs to be stopped), which not only reduces the production efficiency but also increases the labor intensity and safety risk of the workers; the other is that although a combination of a conventional swing arm grinding machine and a cap-changing machine with a gun-changing disc can be used to achieve automatic grinding and cap-changing, this method occupies a large working space, has a high cost, and because the robot needs to frequently switch tools, the operation time is not less than that of manual cap-changing.

[0005] With the development of domestic industries such as vehicle manufacturing and mold manufacturing, the requirements for spot welding standards and production capacity are getting higher and higher. There is an urgent need for an electrode cap maintenance device to improve production efficiency, reduce the labor intensity of workers, and enhance safety. Summary of the Invention

[0006] The main purpose of the present invention is to provide an electrode cap maintenance device to solve the above technical problems.

[0007] The object of the present invention can be achieved by adopting the following technical solutions:

[0008] An electrode cap maintenance device, suitable for fixed welding tongs, the electrode cap maintenance device includes:

[0009] A gearbox, on which a grinding unit and a cap-removing unit are provided;

[0010] A speed reducer, which is connected to the gear box. The speed reducer includes a power source, and the power source is respectively connected to the grinding unit and the cap removing unit through the gear box for transmission;

[0011] A cap feeding unit, which is relatively fixedly arranged with the grinding unit and the cap removing unit respectively. The cap feeding unit is used for storing and supplying new electrode caps to the fixed type welding tongs; and

[0012] A floating displacement mechanism, which is connected to the speed reducer. The floating displacement mechanism includes a first cylinder for driving movement along the Y-axis direction and a second cylinder for driving movement along the Z-axis direction. The Y-axis and the Z-axis are perpendicular to each other to form a predetermined plane. The floating displacement mechanism is used for adjusting the positions of the speed reducer and the gear box on the predetermined plane through the first cylinder and the second cylinder, so that the fixed type welding tongs can be respectively docked with the grinding unit, the cap removing unit and the cap feeding unit.

[0013] Wherein, the grinding unit, the cap removing unit and the cap feeding unit are linearly distributed along the Y-axis direction of the predetermined plane.

[0014] Wherein, it further includes: a swing arm mechanism, and an angle compensation mechanism is arranged between the swing arm mechanism and the floating displacement mechanism. The angle compensation mechanism is used for adjusting the angle of the floating displacement mechanism relative to the fixed type welding tongs.

[0015] Wherein, the angle compensation mechanism includes a mounting plate, a hinge and an angle adjusting cylinder. The hinge is arranged between the mounting plate and the swing arm mechanism. The mounting plate is respectively connected to the angle adjusting cylinder and the floating displacement mechanism. The angle adjusting cylinder is used for driving the mounting plate to rotate around the hinge.

[0016] Wherein, the grinding unit includes a grinding main body and a shield assembly arranged above the grinding main body. The grinding main body is arranged on the top of the gear box, and the grinding main body is in transmission connection with the power source. The shield assembly includes an upper cover and a lower shield. The upper cover and the lower shield jointly form a cavity. A through hole is arranged at the top of the upper cover. The cavity is arranged between the through hole and the grinding main body. The cavity is respectively connected with a blowing device and a vacuum valve.

[0017] Among them, the cap-removing unit includes a driving gear, which is in transmission connection with the power source. The driving gear has an inner cavity, and at least two claws are arranged in the inner cavity of the driving gear. Each claw pivots around a pin shaft. The claw has a cutting part and a tail arranged oppositely. The tail of the claw is connected to the inner wall of the driving gear. Among them, the rotation of the driving gear drives the claw to pivot around the pin shaft, so that the cutting part of the claw moves towards or away from the electrode cap of the fixed-type welding tongs.

[0018] Among them, the cap-supplying unit includes a magazine body. A channel for accommodating a plurality of the new electrode caps is arranged in the magazine body. A pushing mechanism is arranged in the channel and is used for pushing the new electrode caps to a predetermined position. A remaining quantity sensor and a capped sensor are arranged on the magazine body. The remaining quantity sensor is used for detecting the remaining quantity of the new electrode caps, and the capped sensor is used for detecting whether an electrode cap is installed on the electrode rod of the fixed-type welding tongs.

[0019] Among them, the floating displacement mechanism includes a fixed plate and a floating plate. The floating plate is slidably connected to the fixed plate through a guide rail assembly. The first cylinder is arranged between the fixed plate and the floating plate to drive the floating plate to move along the Y-axis direction. The reduction gearbox is connected to the floating plate. The second cylinder is arranged on the floating plate to drive the reduction gearbox to move along the Z-axis direction.

[0020] Among them, the floating displacement mechanism further includes a sliding rod and a holding spring sleeved on the sliding rod. The sliding rod is connected to the reduction gearbox and is used for guiding the reduction gearbox to move along the Z-axis direction. The holding spring abuts against the reduction gearbox.

[0021] Among them, a position sensor is further included, and the position sensor is used for detecting the relative position between the fixed-type welding tongs and the gearbox.

[0022] The beneficial technical effects of the present invention: By integrating the functions of grinding, cap-removing and cap-supplying units on a single moving module composed of a gearbox and a reduction gearbox, and using a floating displacement mechanism including Y-axis and Z-axis drives, the module can actively move and accurately align and dock with the fixed welding tongs. This design realizes the full automation of the maintenance of the electrode caps of the fixed-type welding tongs. The present invention overcomes the problems of low production efficiency, high labor intensity and high safety risk caused by manual replacement of electrode caps in the background technology. Compared with the existing combined automation solutions, its integrated design and active displacement ability provide an automation solution with a more compact structure, a smaller floor area, no need for the robot to frequently switch tools, and higher maintenance efficiency, effectively solving the problem of the automated maintenance of fixed-type welding tongs. Description of the Drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic three-dimensional view of the electrode cap maintenance device provided by the embodiment of the present invention;

[0025] Figure 2 Schematic three-dimensional view of the gearbox in the electrode cap maintenance device provided by the embodiment of the present invention;

[0026] Figure 3 Another perspective three-dimensional view of the gearbox in the electrode cap maintenance device provided by the embodiment of the present invention;

[0027] Figure 3a Explosion schematic view of the cap removal unit in the electrode cap maintenance device provided by the embodiment of the present invention;

[0028] Figure 4 Schematic three-dimensional view of the reduction gearbox in the electrode cap maintenance device provided by the embodiment of the present invention;

[0029] Figure 5 Schematic three-dimensional view of the cap supply unit in the electrode cap maintenance device provided by the embodiment of the present invention;

[0030] Figure 6 Another perspective three-dimensional view of the cap supply unit in the electrode cap maintenance device provided by the embodiment of the present invention;

[0031] Figure 7 Schematic three-dimensional view of the floating displacement mechanism in the electrode cap maintenance device provided by the embodiment of the present invention;

[0032] Figure 8 Schematic three-dimensional view of the angle compensation mechanism in the electrode cap maintenance device provided by the embodiment of the present invention;

[0033] Figure 9 Schematic three-dimensional view of the shield assembly in the electrode cap maintenance device provided by the embodiment of the present invention;

[0034] Figure 10 Schematic view of the predetermined plane in the electrode cap maintenance device provided by the embodiment of the present invention;

[0035] Figure 11 Schematic view of the control of the swing arm mechanism in the electrode cap maintenance device provided by the embodiment of the present invention.

[0036] Explanation of reference numerals:

[0037] In the figure: 100 - gearbox, 110 - grinding unit, 120 - grinding main body, 130 - shield assembly, 131 - upper cover, 132 - lower shield, 133 - cavity, 134 - through hole, 135 - air blowing device, 136 - vacuum valve, 140 - cap removing unit, 141 - driving gear, 142 - inner cavity, 143 - claw, 144 - pin shaft, 145 - cutting part, 146 - tail, 147 - pin shaft hole, 148 - notch, 150 - cap supplying unit, 200 - reduction gearbox, 210 - servo motor, 220 - transmission shaft, 230 - transmission shaft hole position, 310 - magazine main body, 311 - channel, 313 - allowance inductor, 314 - cap presence inductor, 315 - limit lever, 400 - floating displacement mechanism, 410 - fixed plate, 420 - floating plate, 430 - guide rail assembly, 440 - first cylinder, 450 - second cylinder, 460 - sliding rod, 461 - mounting hole position, 470 - retaining spring, 500 - swing arm mechanism, 600 - angle compensation mechanism, 610 - mounting plate, 620 - hinge, 630 - angle adjusting cylinder, 640 - fixed block, 700 - electrode cap, 810 - position of moving arm of welding tongs, 820 - position of static arm of welding tongs. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0040] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0041] It should be further understood that the term " / and / " as used in this specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0042] Please refer to simultaneously Figures 1-11. An electrode cap 700 maintenance device provided in an embodiment of the present invention is suitable for automated maintenance of the electrode cap 700 of a fixed welding tongs, including operations such as grinding, removing old caps and installing new caps. The device includes: a gear box 100, on which a grinding unit 110 and a cap removal unit 140 are provided; a reduction box 200, the reduction box 200 is connected to the gear box 100, the reduction box 200 includes a power source, and the power source is respectively connected to the grinding unit 110 and the cap removal unit 140 through the gear box 100; a cap supply unit 150, the cap supply unit 150 is respectively fixedly arranged relative to the grinding unit 110 and the cap removal unit 140, and the cap supply unit 150 is used to store and supply new electrode caps 700 to the fixed welding tongs; and a floating displacement machine The floating displacement mechanism 400 is connected to the reduction box 200, and the floating displacement mechanism 400 includes a first cylinder 440 for driving movement along the Y-axis direction and a second cylinder 450 for driving movement along the Z-axis direction, wherein the Y-axis and the Z-axis are perpendicular to each other to form a predetermined plane, and the floating displacement mechanism 400 is used to adjust the positions of the reduction box 200 and the gear box 100 on the predetermined plane through the first cylinder 440 and the second cylinder 450, so that the fixed welding clamp can be docked with the grinding unit 110, the cap removal unit 140 and the cap supply unit 150 respectively.

[0043] In this embodiment, the grinding unit 110 is used to perform surface grinding and shaping on the electrode cap 700 used on the fixed welding tongs to restore its working performance. The grinding unit 110 is driven by the gear box 100 and the reduction box 200 connected thereto. The cap removal unit 140 is used to remove the old electrode cap 700 that needs to be replaced from the electrode rod of the fixed welding tongs, and the cap removal unit 140 is also driven by the gear box 100 and the reduction box 200 connected thereto.

[0044] The gearbox 100 is connected to a reduction box 200. The main function of the reduction box 200 is to provide power to the grinding unit 110 and the cap removal unit 140 in the gearbox 100 and adjust the speed / torque. Specifically, the reduction box 200 contains a power source. The reduction box 200 is connected to the grinding unit 110 and the cap removal unit 140 in the gearbox 100 through a transmission mechanism, thereby transmitting power to the grinding unit 110 and the cap removal unit 140, so that the reduction box 200 can drive the grinding unit 110 to perform a grinding action or drive the cap removal unit 140 to perform a cap removal action.

[0045] A cap supply unit 150 is also provided on the reduction box 200. The cap supply unit 150 is designed with a channel 311 for storing a plurality of electrode caps 700, and the cap supply unit 150 has the function of pushing the stored new electrode caps 700 one by one to a predetermined position, so that the fixed welding tongs can conveniently install new electrode caps 700.

[0046] In order to enable the fixed welding tongs to accurately and conveniently dock with the grinding unit 110, the cap removing unit 140, and the cap feeding unit 150 to perform corresponding maintenance operations, the device further includes a floating displacement mechanism 400. The reduction gearbox 200 is connected to the floating displacement mechanism 400.

[0047] The floating displacement mechanism 400 includes a first cylinder 440 capable of driving the whole formed by the reduction gearbox 200 and the gearbox 100 to move in the Y-axis direction, and a second cylinder 450 capable of driving the above-mentioned whole to move in the Z-axis direction. The Y-axis direction and the Z-axis direction here are two mutually perpendicular directions, which together define a predetermined plane, such as the YZ plane. Through the actions of the cylinders in these two directions, the floating displacement mechanism 400 can adjust the overall position of the reduction gearbox 200 connected thereto and the gearbox 100 mounted thereon in the YZ plane.

[0048] By driving the gearbox 100 and the grinding unit 110, the cap removing unit 140, and the cap feeding unit 150 thereon to move in the YZ plane through the floating displacement mechanism 400, the working areas of the grinding unit 110, the cap removing unit 140, or the cap feeding unit 150 can be selectively aligned with the end of the electrode rod of the fixed welding tongs. In this way, the fixed welding tongs can be respectively docked with the grinding unit 110, the cap removing unit 140, and the cap feeding unit 150 to complete a series of maintenance operations such as grinding, removing, and installing the electrode cap 700.

[0049] When the device is in use, first, the grinding unit 110 is moved to the position corresponding to the welding tongs electrode cap 700 through the first cylinder 440, then the height is adjusted through the second cylinder 450 to achieve docking, and then the power source is started to drive the grinding unit 110 to perform grinding. If the electrode cap 700 needs to be replaced, the first cylinder 440 is driven to move the cap removing unit 140 to the corresponding position, the second cylinder 450 adjusts the height for docking, and the power source is started to drive the cap removing unit 140 to remove the old cap. After the removal is completed, the first cylinder 440 is driven to move the cap feeding unit 150 to the corresponding position, and the second cylinder 450 adjusts the height to align the new cap with the electrode rod, and the fixed welding tongs act on their own or cooperate with other mechanisms to complete the installation of the new electrode cap 700.

[0050] Generally speaking, in this embodiment, the grinding unit 110, the cap removing unit 140, and the cap feeding unit 150 are integrated on a single module composed of a gearbox 100 and a reduction gearbox 200, and the position adjustment of the module in two dimensions of the Y-axis and the Z-axis is realized through the floating displacement mechanism 400, so that the entire maintenance process of the electrode cap 700 can be completed automatically without manual intervention, thereby eliminating the safety risks brought by manual operation, shortening the line stop time, improving the production efficiency, and reducing the labor intensity. In addition, in this embodiment, the three functional units of grinding, cap removing, and cap feeding are integrated on a relatively compact single body composed of the gearbox 100 and the reduction gearbox 200, and are positioned by a set of floating displacement mechanisms 400, so the structure is more compact, effectively reducing the overall floor area and the total cost of the device.

[0051] In this embodiment, as Figure 10 shown, the Y-axis is the horizontal axis in the figure, and the arrow pointing to the right is the positive direction. According to Figure 10 the coordinate points in, such as (0, 0), (76, 0), (175, 0), the Y-axis direction represents the arrangement direction of the three functional units of the grinding unit 110, the cap removing unit 140, and the cap feeding unit 150. The first cylinder 440 in the floating displacement mechanism 400 drives the reduction gearbox 200 and the gearbox 100 to move along this axis to align different functional units with the welding tongs.

[0052] The Z-axis is the vertical axis in the figure, with the upward direction in the figure being the positive direction and the downward direction being the negative direction. According to Figure 10 the coordinate points in, such as (0, 40), (0, 0), (0, -40), the Z-axis direction represents the vertical (up and down) position adjustment of the reduction gearbox 200 and the gearbox 100 relative to the welding tongs. The second cylinder 450 in the floating displacement mechanism 400 drives the reduction gearbox 200 and the gearbox 100 to move along this axis.

[0053] Figure 10 The "welding tongs moving arm position" (about near Z = +40) and the "welding tongs static arm position" (about near Z = -40) are also schematically marked in, which indicates that the second cylinder 450 is used to adjust the relative height of the reduction gearbox 200, the gearbox 100, and the components thereon with respect to the welding tongs to perform specific maintenance actions.

[0054] In summary, the predetermined plane is the YZ plane, which is the working plane for the floating displacement mechanism 400 to adjust the positions of the reduction gearbox 200 and the gearbox 100. The Y-axis is the horizontal direction, used to switch the functional units (grinding, cap removing, cap feeding) aligned with the welding tongs; the Z-axis is the vertical direction, used to adjust the relative height of the functional units with respect to the welding tongs to perform specific operations.

[0055] In one embodiment, the grinding unit 110, the cap removing unit 140, and the cap feeding unit 150 are linearly distributed along the Y-axis direction of the predetermined plane.

[0056] In this embodiment, with reference to Figure 10 and in combination with Figure 3 , in the electrode cap 700 maintenance device, in order to optimize the efficiency of the floating displacement mechanism 400 moving along the Y-axis direction to switch functional units and simplify the control logic, the grinding unit 110, the cap removing unit 140, and the cap supplying unit 150 are arranged and distributed linearly along the Y-axis direction in the predetermined plane (YZ plane) defined by the floating displacement mechanism 400. This means that the working points of these three functional units are located on a straight line parallel to the Y-axis.

[0057] When it is necessary to dock the fixed-type welding tongs with different functional units, the floating displacement mechanism 400 mainly drives the first cylinder 440 to move the reduction gearbox 200 and the gearbox 100 as a whole along the Y-axis direction. For example, the grinding unit 110 can be set at the origin of the Y-axis coordinate (Y = 0), the cap removing unit 140 can be set at Y = 76 mm, and the cap supplying unit 150 can be set at Y = 175 mm. These values are only examples, and the specific distances are determined according to the design. By simply controlling the first cylinder 440 to extend and retract to several preset positions, the switching of functional units can be completed. This greatly simplifies the control logic and improves the efficiency and reliability of positioning.

[0058] Since the three functional units are arranged along a single axis (Y-axis), the movement path for switching from one unit to another is a simple and direct linear motion. The second cylinder 450 is mainly responsible for adjusting the vertical height of the device to adapt to the docking height of the welding tongs electrode rod or to avoid obstacles during the movement along the Y-axis.

[0059] In this embodiment, when maintenance is required: If grinding is needed, the floating displacement mechanism 400 drives the device to move along the Y-axis to the Y coordinate corresponding to the grinding unit 110 and adjusts the Z-axis height for docking. If it is necessary to remove the old cap, the driving device moves along the Y-axis to the Y coordinate corresponding to the cap removing unit 140 and adjusts the Z-axis height for docking. If it is necessary to install a new cap, the driving device moves along the Y-axis to the Y coordinate corresponding to the cap supplying unit 150 and adjusts the Z-axis height for docking. The entire switching process mainly relies on the linear displacement along the Y-axis, making the operation of the device more efficient, accurate, and easy to control.

[0060] In one embodiment, the device further includes: a swing arm mechanism 500, and an angle compensation mechanism 600 is provided between the swing arm mechanism 500 and the floating displacement mechanism 400. The angle compensation mechanism 600 is used to adjust the angle of the floating displacement mechanism 400 relative to the fixed-type welding tongs.

[0061] In this embodiment, in practical applications, the overall assembly composed of the gearbox 100, the reduction gearbox 200, the cap supply unit 150, the floating displacement mechanism 400, etc. needs to be moved into the working area of the fixed spot welder. To this end, the device further includes a swing arm mechanism 500. The swing arm mechanism 500 is responsible for swinging or moving the above-mentioned overall assembly from the standby position to the working position near the fixed spot welder.

[0062] For example, on a production line, when the electrode cap 700 does not need to be maintained, the swing arm mechanism 500 can move the maintenance unit away to avoid interfering with normal welding operations; when maintenance is required, the swing arm mechanism 500 swings or moves it near the fixed spot welder again. The swing arm mechanism 500 includes a rotatable base and a connecting arm (not shown in the drawings), and can achieve translational or rotational movements within a large range.

[0063] An angle compensation mechanism 600 is provided between the swing arm mechanism 500 and the floating displacement mechanism 400. The angle compensation mechanism 600 acts as a connecting piece and a regulator, and its function is to adjust the angle of the floating displacement mechanism 400 (and the gearbox 100, reduction gearbox 200, etc. it carries) relative to the fixed spot welder.

[0064] The angle compensation mechanism 600 is installed at the connection between the end of the swing arm mechanism 500 and the floating displacement mechanism 400. This means that the swing arm mechanism 500 is responsible for macroscopic position movement, while the angle compensation mechanism 600 is responsible for fine-tuning the overall attitude (especially its working plane, i.e., the YZ plane) of the maintenance unit after reaching the target area.

[0065] The electrode arm or the electrode cap 700 of the fixed spot welder itself may have a certain inclination angle (relative to the standard horizontal or vertical attitude). Without angle compensation, even if the floating displacement mechanism 400 is accurately positioned in the YZ plane, it may not be able to be correctly docked due to angle mismatch. The angle compensation mechanism 600 allows the floating displacement mechanism 400 to tilt at a certain angle relative to the swing arm mechanism 500 to match the actual angle of the fixed spot welder. This ensures that the subsequent precise positioning of the Y-axis and Z-axis performed by the floating displacement mechanism 400 can accurately align the grinding unit 110, the cap removal unit 140, or the cap supply unit 150 with the inclined electrode cap 700, thus ensuring that the subsequent grinding, cap removal, and cap supply operations can be carried out accurately and reliably.

[0066] In actual operation, the maintenance process is as follows: First, the swing arm mechanism 500 moves the entire maintenance unit into the working range of the fixed welding tongs. Then, the angle compensation mechanism 600 adjusts the tilt angle of the floating displacement mechanism 400 according to the preset or sensor-detected welding tongs angle, so that its working plane (YZ plane) is optimally aligned with the axis or end face of the welding tongs electrode. Finally, the first cylinder 440 and the second cylinder 450 of the floating displacement mechanism 400 are activated to perform a linear displacement within the YZ plane with the compensated angle, where the Y-axis selects the functional unit and the Z-axis adjusts the height to achieve precise docking with the grinding unit 110, the cap removal unit 140, or the cap supply unit 150.

[0067] By adding the swing arm mechanism 500 and the angle compensation mechanism 600, the adaptability of the device is significantly improved in this embodiment. It can not only serve the fixed welding tongs in the standard posture, but also effectively cope with the welding tongs with an inclined angle of the electrode arm due to design or installation reasons. This ensures the accuracy and reliability of subsequent grinding, cap removal, and cap supply operations, and expands the application range of the device.

[0068] In one embodiment, the angle compensation mechanism 600 includes a mounting plate 610, a hinge 620, and an angle adjustment cylinder 630. The hinge 620 is disposed between the mounting plate 610 and the swing arm mechanism 500. The mounting plate 610 is respectively connected to the angle adjustment cylinder 630 and the floating displacement mechanism 400. The angle adjustment cylinder 630 is used to drive the mounting plate 610 to rotate around the hinge 620.

[0069] In this embodiment, the hinge 620 is disposed between the mounting plate 610 and the swing arm mechanism 500, providing a rotation axis for the mounting plate 610. On the one hand, the mounting plate 610 is connected to the floating displacement mechanism 400, carrying the entire floating displacement mechanism 400 and the components driven by it; on the other hand, the mounting plate 610 is also connected to the angle adjustment cylinder 630, receiving the driving force from the angle adjustment cylinder 630.

[0070] The angle adjustment cylinder 630 is the driving component for realizing the angle adjustment. Through its telescopic action, it drives the mounting plate 610 to rotate around the hinge 620, and then adjusts the posture of the entire floating displacement mechanism 400 fixed thereon. For example, one end of the angle adjustment cylinder 630 can be connected to the mounting plate 610, and the other end is connected to a component relatively fixed to the swing arm mechanism 500. When the angle adjustment cylinder 630 extends or retracts, it will change the angle between the mounting plate 610 and the swing arm mechanism 500, thereby driving the overall angle deflection of the floating displacement mechanism 400 connected thereto to adapt to the fixed welding tongs electrodes at different angles.

[0071] In a specific embodiment, the angle compensation mechanism 600 further includes a fixed block 640. The fixed block 640 is fixedly connected to the swing arm mechanism 500. At the same time, the other end of the angle adjustment cylinder 630 is fixedly connected to the fixed block 640. The mounting plate 610 is disposed on the side of the fixed block 640 away from the swing arm mechanism 500 through a hinge 620. Here, the fixed block 640 is the component that is relatively fixed to the swing arm mechanism 500.

[0072] In one embodiment, the grinding unit 110 includes a grinding main body 120 and a shield assembly 130 disposed above the grinding main body 120. The grinding main body 120 is disposed on the top of the gearbox 100, and the grinding main body 120 is in transmission connection with a power source. The shield assembly 130 includes an upper cover 131 and a lower shield 132. The upper cover 131 and the lower shield 132 together form a cavity 133. A through hole 134 is provided at the top of the upper cover 131. The cavity 133 is disposed between the through hole 134 and the grinding main body 120. The cavity 133 is respectively connected with a blowing device 135 and a vacuum valve 136.

[0073] In this embodiment, the grinding unit 110 includes a grinding main body 120 that performs actual cutting and grinding operations, and a shield assembly 130 that is installed above the grinding main body 120 and is used for collecting and processing grinding debris. The grinding main body 120 includes components such as a grinding tool that is driven to rotate by a transmission shaft 220 of a reduction gearbox 200 by a servo motor 210, so as to realize cutting on the surface of the electrode cap 700.

[0074] The shield assembly 130 is specifically composed of an upper cover 131 and a lower shield 132. The upper cover 131 and the lower shield 132 are assembled with each other, for example, fixed by means of buckles, etc., and together enclose an internal cavity 133. In order to ensure that the electrode rod of the fixed type welding tong can smoothly enter the grinding area, a through hole 134 is provided at the top of the upper cover 131, that is, on the surface away from the grinding main body 120. The size and position of this through hole 134 are adapted to and guide the entry of the electrode rod.

[0075] The cavity 133 formed by the upper cover 131 and the lower shield 132 has a space exactly between the through hole 134 at the top of the upper cover 131 and the grinding main body 120 below. Such a structural layout enables the electrode rod of the fixed type welding tong to pass through the through hole 134 at the top of the upper cover 131, pass through the internal space of the cavity 133, and finally reach or be very close to the grinding main body 120 below, so that the grinding main body 120 (tool) can effectively act on the electrode cap 700 at the end of the electrode rod to complete the grinding operation.

[0076] In order to effectively collect the metal debris generated during the grinding process and keep the grinding area clean, the cavity 133 is connected to a blowing device 135 and a vacuum valve 136. The blowing device 135 may include one or more air nozzle interfaces, such as the attached Figure 9 The upper air blowing interface and the lower air blowing interface schematically shown in the figure can be connected to an external compressed air source. By blowing air into the cavity 133, the debris adhering to the electrode rod, the electrode cap 700 or the grinding body 120 during grinding can be blown off and stirred up for subsequent removal. The vacuum valve 136 is used to connect to an external vacuum suction system (negative pressure source). Through this vacuum valve 136, the air in the cavity 133 can be sucked out together with the debris blown up by the blowing device 135, so as to achieve the purpose of efficiently collecting and removing grinding waste chips.

[0077] In summary, the grinding unit 110 described in this embodiment, especially the structure of its shield assembly 130, not only guides the positioning of the electrode rod by forming a cavity 133 with a top through hole 134, but also integrates the blowing and vacuum suction functions, so that metal debris can be effectively removed during the grinding process of the electrode cap 700, ensuring the cleanliness, efficiency and reliability of the grinding operation.

[0078] In one embodiment, the cap removal unit 140 includes a driving gear 141, which is transmission-connected to a power source. The driving gear 141 has an inner cavity 142. The inner cavity 142 of the driving gear 141 is provided with at least two claws 143. Each claw 143 pivots around a pin shaft 144. The claw 143 has a cutting portion 145 and a tail portion 146 that are relatively arranged. The tail portion 146 of the claw 143 is connected to the inner wall of the driving gear 141, wherein the rotation of the driving gear 141 drives the claw 143 to pivot around the pin shaft 144 so that the cutting portion 145 of the claw 143 moves toward or away from the electrode cap 700 of the fixed welding clamp.

[0079] In this embodiment, the electrode cap removing unit 140 is designed to remove the old electrode cap 700 on the fixed type welding tongs by an "unscrewing" combined with "ejecting" method that is efficient and causes little damage to the electrode rod. The electrode cap removing unit 140 includes a driving gear 141, which is in transmission connection with the power source in the reduction gearbox 200 through a transmission shaft 220, allowing the rotational motion of the power source to be transmitted. The driving gear 141 is designed as an annular structure with an inner cavity 142 inside to accommodate three claw jaws 143. Each claw jaw 143 pivots around a pin shaft 144, which is vertically fixed in the inner cavity 142 of the driving gear 141, ensuring that the claw jaw 143 can rotate by a certain angle around its corresponding pin shaft 144. Here, the pin shaft 144 passes through a pin shaft hole 147 on the claw jaw 143. The claw jaw 143 itself has a cutting part 145 and a tail part 146 arranged oppositely, where the cutting part 145 is a front-end structure and can be designed with a cutting edge so that it can cut into the surface of the electrode cap 700 during rotation to generate torque. The tail part 146 forms a mechanical connection with the inner wall of the driving gear 141, for example, through a notch 148 design, to achieve force transmission. When the driving gear 141 rotates driven by the power source, this connection will force the tail part 146 of the claw jaw 143 to move accordingly, thereby driving the claw jaw 143 to pivot around the pin shaft 144, causing the cutting part 145 to move towards or away from the electrode cap 700 of the fixed type welding tongs. This mechanism enables the electrode cap removal process to gradually apply a torsional force from the initial clamping state to loosen and remove the electrode cap 700 without the need for additional tools.

[0080] During the actual working process, the operation of the electrode cap removing unit 140 closely cooperates with the floating displacement mechanism 400. First, the floating displacement mechanism 400 adjusts the device to a suitable position so that the inner cavity 142 of the driving gear 141 is aligned with the electrode cap 700. Subsequently, the power source starts to drive the driving gear 141 to rotate. For example, when rotating clockwise, the tail part 146 of the claw jaw 143 is pushed, prompting the cutting part 145 to move inward and clamp the outer surface of the electrode cap 700; continuous rotation will produce a cutting and torsional effect to overcome the locking force between the electrode cap 700 and the electrode rod, realizing the removal. Once the electrode cap 700 is loosened, the driving gear 141 can rotate in the reverse direction to make the cutting part 145 of the claw jaw 143 move outward and release the electrode cap 700. This design not only improves the accuracy of electrode cap removal but also reduces the required torque through the lever principle of the pivot of the pin shaft 144, reducing the risk of wear to the electrode rod.

[0081] In one embodiment, the cap supply unit 150 includes a magazine body 310. A channel 311 for accommodating a plurality of new electrode caps 700 is provided inside the magazine body 310. A pushing mechanism is arranged in the channel 311 and is used to push the new electrode caps 700 to a predetermined position. A remaining quantity sensor 313 and a capped sensor 314 are arranged on the magazine body 310. The remaining quantity sensor 313 is used to detect the remaining quantity of the new electrode caps 700, and the capped sensor 314 is used to detect whether an electrode cap 700 is installed on the electrode rod of the fixed type welding tongs.

[0082] In this embodiment, the magazine body 310 includes a channel 311 for accommodating a plurality of new electrode caps 700 to be used. These new electrode caps 700 are stored in a queue form in the channel 311 for subsequent sequential supply.

[0083] To realize the function of sending the stored electrode caps 700 to the designated cap-taking position, a pushing mechanism (not shown in the drawings) is arranged inside the channel 311. The length direction of the pushing mechanism is consistent with the length direction of the channel 311, as Figure 5 and Figure 6 shown, and is also the same as the length direction of the magazine body 310. The function of the pushing mechanism is to continuously apply a thrust to the queue of the electrode caps 700 in the channel 311 and push the foremost electrode cap 700 to a predetermined position, which is the docking point where the electrode rod of the fixed type welding tongs comes to pick up a new cap. For example, this pushing function can be realized by a spring mechanism. When using the spring mechanism, some limiting structures or positioning structures can be used in cooperation, such as Figure 5 the limiting lever 315 in

[0084] to ensure that the foremost electrode cap 700 stays stably at the predetermined position waiting to be installed.

[0085] The magazine body 310 is also provided with two types of sensors.

[0086] The second type is the capped sensor 314. This sensor is not used to detect whether there is a cap in the magazine, but to detect whether there is already an electrode cap 700 on the electrode rod of the fixed welding tongs coming to pick up the cap. This sensor is arranged at a position close to the new cap pickup point. Before the electrode rod of the welding tongs reaches the position where a new cap is to be installed, it will first pass through the detection area of this sensor. Through this detection, it can be confirmed whether the electrode rod is in a bare state (i.e., the old cap has been successfully removed). If it is detected that there is still an old cap on the electrode rod, the subsequent cap installation action can be blocked, thus effectively avoiding equipment damage or production errors that may be caused by repeated cap installation. In the whole cap replacement process, detecting the state of the electrode rod of the welding tongs with or without a cap is a key step to ensure the safety and success of the operation.

[0087] In summary, the cap supply unit 150 of this embodiment realizes the storage and transportation of the new electrode cap 700 through the channel 311 and the pushing mechanism in its magazine body 310, and uses the margin sensor 313 and the capped sensor 314 for detecting the state of the electrode rod of the welding tongs, providing a reliable guarantee for the automatic operation of the entire electrode cap 700 maintenance device.

[0088] In one embodiment, the floating displacement mechanism 400 includes a fixed plate 410 and a floating plate 420. The floating plate 420 is slidably connected to the fixed plate 410 through a guide rail assembly 430. A first cylinder 440 is arranged between the fixed plate 410 and the floating plate 420 to drive the floating plate 420 to move in the Y-axis direction. The reduction gearbox 200 is connected to the floating plate 420, and a second cylinder 450 is arranged on the floating plate 420 to drive the reduction gearbox 200 to move in the Z-axis direction.

[0089] In this embodiment, the floating displacement mechanism 400 includes a fixed plate 410 and a floating plate 420. The floating plate 420 is slidably connected to the fixed plate 410 through a guide rail assembly 430, and this guide rail assembly 430 limits that the floating plate 420 can only move relative to the fixed plate 410 in the Y-axis direction.

[0090] The first cylinder 440 is arranged between the fixed plate 410 and the floating plate 420. By controlling the expansion and contraction of the first cylinder 440, the floating plate 420 can be driven to slide relative to the fixed plate 410 in the Y-axis direction, thereby realizing the position adjustment of the entire maintenance unit in the Y-axis direction.

[0091] The reduction gearbox 200 (and the gearbox 100 and the cap supply unit 150 fixed thereon) is connected to the floating plate 420. This means that the reduction gearbox 200 will move along with the floating plate 420 in the Y-axis direction.

[0092] The second cylinders 450 are arranged on the floating plate 420. These second cylinders 450 are used to drive the reduction gearbox 200 to move relative to the floating plate 420 in the Z-axis direction. For example, the cylinder block of the second cylinder 450 can be fixed on the floating plate 420, and its piston rod is connected to the reduction gearbox 200 or a structure connected thereto. By the telescopic movement of the second cylinder 450, the lifting of the reduction gearbox 200 in the Z-axis direction is realized.

[0093] By driving the floating plate 420 to move in the Y-axis direction through the first cylinder 440, and driving the reduction gearbox 200 to move relative to the floating plate 420 in the Z-axis direction through the second cylinder 450, the floating displacement mechanism 400 can accurately control the position of the reduction gearbox 200 (and the grinding unit 110, cap removal unit 140, and cap supply unit carried thereon) in the YZ plane to ensure accurate docking with different maintenance points of the fixed welding tongs.

[0094] In an embodiment, the floating displacement mechanism 400 further includes a sliding rod 460 and a retaining spring 470 sleeved on the sliding rod 460. The sliding rod 460 is connected to the reduction gearbox 200 and is used to guide the reduction gearbox 200 to move in the Z-axis direction. The retaining spring 470 abuts against the reduction gearbox 200.

[0095] In this embodiment, two sliding rods 460 are fixed on the floating plate 420. The sliding rod 460 is arranged parallel to the Z-axis direction. The sliding rod 460 is connected to the reduction gearbox 200. For example, the sliding rod 460 passes through the mounting hole position 461 provided on the reduction gearbox 200, and a sliding fit is formed between the reduction gearbox 200 and the sliding rod 460. Such a setting enables the sliding rod 460 to provide guidance when the second cylinder 450 drives the reduction gearbox 200 to move in the Z-axis direction, ensuring the smooth and non-yaw Z-direction movement of the reduction gearbox 200 (and the gearbox 100 above it).

[0096] A retaining spring 470 is sleeved on each sliding rod 460. The function of the retaining spring 470 is to apply a continuous elastic force to the reduction gearbox 200 when the second cylinder 450 is in a specific state (such as the initial reset state), so that a preset distance can be maintained between the reduction gearbox 200 and the second cylinder 450 or it can be in a stable initial position.

[0097] By adding the sliding rod 460 and the retaining spring 470, the floating displacement mechanism 400 in this embodiment is enhanced in terms of movement directivity, stability, and initial position certainty in the Z-axis direction.

[0098] In this embodiment, there is a synergistic relationship between the retaining spring 470 in the floating displacement mechanism 400 and the cap removal unit 140 arranged in the gearbox 100: In the operation process of removing the old electrode cap 700, an efficient removal combining "unscrewing" and "springing away" is realized:

[0099] When the electrode cap 700 needs to be disassembled, first, the gearbox 100 is moved to a predetermined position by the first cylinder 440 and the second cylinder 450 of the floating displacement mechanism 400, so that the cap removal unit 140 is aligned with the electrode cap 700 to be disassembled. The second cylinder 450 drives the reduction gearbox 200 (and the gearbox 100) to move along the sliding rod 460, so that the jaws 143 of the cap removal unit 140 approach.

[0100] Subsequently, the drive source in the reduction gearbox 200 drives the drive gear 141 of the cap removal unit 140 to rotate. The rotation of the drive gear 141 drives the jaws 143 to pivot around the pin shaft 144, so that the cutting part 145 thereof clamps the outer surface of the electrode cap 700.

[0101] Continue to drive the rotation, and the cutting part 145 of the jaws 143 cuts on the outer surface of the electrode cap 700, generating a torsional force, aiming to overcome the taper fit locking force between the electrode cap 700 and the electrode rod, that is, to perform the "unscrewing" action.

[0102] During this rotational cutting (unscrewing) process, in addition to generating the main tangential torsional force, the cutting force will also generate an axial reaction force along the Z-axis direction (parallel to the axis of the electrode rod). This reaction force acts on the jaws 143 and is transmitted to the assembly composed of the bearing gearbox 100 and the reduction gearbox 200. The direction of this axial reaction force is towards the electrode rod, that is, it pushes the assembly to move further towards the welding tongs along the Z-axis.

[0103] At this time, this axial reaction force will attempt to push the above-mentioned assembly to continue moving towards the electrode rod along the sliding rod 460. During this movement, the assembly will compress the retaining spring 470 sleeved on the sliding rod 460.

[0104] Therefore, during the "unscrewing" stage, the work done by the axial reaction force is converted into elastic potential energy and stored in the retaining spring 470. The second cylinder 450 is at this time in the holding position or in a low-force output state, allowing this short-distance compression driven by the reaction force to occur.

[0105] As the jaws 143 continuously apply torsional force, when the torsional force is sufficient to overcome the mating force, the electrode cap 700 becomes loose relative to the electrode rod. Once the electrode cap 700 becomes loose, the strong locking state between it and the electrode rod is released, resulting in a sharp reduction or disappearance of the resistance to the rotational cutting of the jaws 143, especially the part of the resistance that generates the above-mentioned axial reaction force.

[0106] Therefore, the axial reaction force that was previously acting on the assembly composed of the gearbox 100 and the reduction gearbox 200 also significantly decreases or disappears accordingly. At this time, the holding spring 470 that was previously compressed and stored energy is no longer suppressed by sufficient reaction force and will quickly release the elastic potential energy it stored. The spring releases energy, generating a reverse thrust force, with the direction away from the electrode rod, acting on the assembly composed of the gearbox 100 and the reduction gearbox 200.

[0107] This reverse thrust force driven by the holding spring 470 will drive the assembly composed of the gearbox 100 and the reduction gearbox 200, as well as the cap removal unit 140 that still holds the loosened electrode cap 700 through the clamping jaws 143, to quickly move away from the electrode rod along the Z-axis in the direction guided by the sliding rod 460.

[0108] This rapid axial separation action is the "spring-off / pull-out" process. Utilizing the elastic energy stored in the holding spring 470, the loosened electrode cap 700 is completely pulled off and separated from the tapered mating end of the electrode rod, thus efficiently and reliably completing the disassembly of the old electrode cap 700.

[0109] Subsequently, the drive gear 141 of the cap removal unit 140 can be controlled to rotate in the reverse direction to loosen the clamping jaws 143 and release the removed old electrode cap 700. The gearbox 100 and the reduction gearbox 200 can continue to move to the next station through the second cylinder 450 and the first cylinder 440, such as discarding the old cap or moving to the position of the cap supply unit 150.

[0110] Through this mechanism that combines the holding spring 470 with the axial reaction force generated during the operation of the cap removal unit 140, this embodiment not only effectively "unscrews" the electrode cap 700, but also realizes a reliable "spring-off" by utilizing the stored elastic energy, improving the success rate of disassembly. At the same time, compared with the pure strong "pull-out" method, the process is more stable, which helps to reduce the impact and potential damage to the welding tongs or the electrode rod.

[0111] In one embodiment, the device further includes a position sensor (not shown in the drawings), and the position sensor is used to detect the relative position between the fixed welding tongs and the gearbox 100.

[0112] In this embodiment, the core function of the position sensor is to detect the relative position between the fixed welding tongs and the gearbox 100 or its functional units thereon, such as the hole positions of the grinding unit 110 and the cap removal unit 140.

[0113] Specifically, the position sensor can have various implementation methods and installation positions. Taking the position sensor installed near the fixed welding tongs as an example. This position sensor is used to detect whether the gearbox 100 or a part of it has moved to a predetermined working position, such as the grinding position, the cap removal position, and the cap supply position.

[0114] In other embodiments, a position sensor may be mounted on the gearbox 100 or the reduction gearbox 200 to detect its distance relative to a specific feature point on the stationary welding tongs, such as the end of the electrode rod, a specific surface of the welding tong body, or a mark.

[0115] In other embodiments, the position sensor may also be integrated into the floating displacement mechanism 400. For example, it detects whether the stroke of the first cylinder 440 or the second cylinder 450 reaches a preset value, or detects the position of the floating plate 420 relative to the fixed plate 410. These position information indirectly reflect the position of the gearbox 100 relative to the stationary welding tongs.

[0116] In this embodiment, the position sensor may be a proximity switch, such as an inductive, capacitive, or photoelectric type, for detecting whether the gearbox 100 reaches several discrete key working points. When the gearbox 100 enters the sensing range, the proximity switch triggers a signal.

[0117] The signal detected by the position sensor is sent to the control system of the device (not shown in the drawings), such as a PLC. The control system confirms whether the gearbox 100 has moved to the target position required to perform specific maintenance tasks (grinding, cap removal, cap supply) based on these position signals. Only after confirming that the position is accurate will the control system initiate the corresponding maintenance action.

[0118] In one embodiment, the reduction gearbox 200 includes a servo motor 210 and a transmission shaft 220. The servo motor 210 drives the grinding unit 110 and the cap removal unit 140 to work through the transmission shaft 220.

[0119] In this embodiment, the servo motor 210 serves as a power source and is installed inside the housing of the reduction gearbox 200. The transmission shaft 220 is also disposed inside the reduction gearbox 200 and is connected to the output end of the servo motor 210. After the servo motor 210 is started, its rotational power is transmitted to the transmission shaft 220. The transmission shaft 220 extends out of the housing of the reduction gearbox 200 and passes through the transmission shaft hole position 230 to connect with the functional units inside the gearbox 100. Through this connection, the power generated by the servo motor 210 is transmitted to the functional units of the gearbox 100 through the transmission shaft 220 to perform corresponding work, thereby completing the grinding or disassembly task of the electrode cap 700.

[0120] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An electrode cap maintenance device, suitable for fixed welding tongs, characterized in that: The electrode cap maintenance device comprises: A gear box, wherein the gear box is provided with a grinding unit and a cap removal unit; A reduction box, the reduction box is connected to the gear box, the reduction box includes a power source, and the power source is respectively connected to the grinding unit and the cap removal unit through the gear box; a cap supply unit, the cap supply unit being fixedly arranged relative to the grinding unit and the cap removal unit, and the cap supply unit being used to store and supply new electrode caps to the fixed welding tongs; and A floating displacement mechanism, wherein the floating displacement mechanism is connected to the reduction box, and the floating displacement mechanism comprises a first cylinder for driving movement along the Y-axis direction and a second cylinder for driving movement along the Z-axis direction, wherein the Y-axis and the Z-axis are perpendicular to each other to form a predetermined plane, and the floating displacement mechanism is used to adjust the positions of the reduction box and the gear box on the predetermined plane through the first cylinder and the second cylinder so that the fixed welding clamp can be docked with the grinding unit, the cap removal unit and the cap supply unit respectively.

2. The electrode cap maintenance device according to claim 1, characterized in that: The grinding unit, the cap removing unit and the cap supplying unit are distributed in a straight line along the Y-axis direction of the predetermined plane.

3. The electrode cap maintenance device according to claim 1, characterized in that: Also includes: A swing arm mechanism, wherein an angle compensation mechanism is arranged between the swing arm mechanism and the floating displacement mechanism, and the angle compensation mechanism is used to adjust the angle of the floating displacement mechanism relative to the fixed welding clamp.

4. The electrode cap maintenance device according to claim 3, characterized in that: The angle compensation mechanism includes a mounting plate, a hinge and an angle adjustment cylinder. The hinge is arranged between the mounting plate and the swing arm mechanism. The mounting plate is connected to the angle adjustment cylinder and the floating displacement mechanism respectively. The angle adjustment cylinder is used to drive the mounting plate to rotate around the hinge.

5. The electrode cap maintenance device according to claim 1, characterized in that: The grinding unit includes a grinding body and a shield assembly arranged above the grinding body, the grinding body is arranged on the top of the gear box, and the grinding body is drivingly connected to the power source, the shield assembly includes an upper cover and a lower shield, the upper cover and the lower shield together form a cavity, a through hole is arranged on the top of the upper cover, the cavity is arranged between the through hole and the grinding body, and the cavity is respectively connected to a blowing device and a vacuum valve.

6. The electrode cap maintenance device according to claim 1, characterized in that: The cap removal unit includes a driving gear, which is transmission-connected to the power source, and the driving gear has an inner cavity. The inner cavity of the driving gear is provided with at least two claws, each of which pivots around a pin shaft, and the claw has a cutting portion and a tail portion that are relatively arranged, and the tail portion of the claw is connected to the inner wall of the driving gear, wherein the rotation of the driving gear drives the claw to pivot around the pin shaft so that the cutting portion of the claw moves toward or away from the electrode cap of the fixed welding tongs.

7. The electrode cap maintenance device according to claim 1, characterized in that: The cap supply unit includes a magazine body, a channel for accommodating a plurality of the new electrode caps is provided in the magazine body, a pushing mechanism is provided in the channel, and the pushing mechanism is used to push the new electrode caps to a predetermined position; a remaining quantity sensor and a cap sensor are provided on the magazine body, the remaining quantity sensor is used to detect the remaining number of the new electrode caps, and the cap sensor is used to detect whether an electrode cap is installed on the electrode rod of the fixed welding clamp.

8. The electrode cap maintenance device according to claim 1, characterized in that: The floating displacement mechanism includes a fixed plate and a floating plate, the floating plate is slidably connected to the fixed plate through a guide rail assembly, the first cylinder is arranged between the fixed plate and the floating plate to drive the floating plate to move along the Y-axis direction, the reduction gearbox is connected to the floating plate, and the second cylinder is arranged on the floating plate to drive the reduction gearbox to move along the Z-axis direction.

9. The electrode cap maintenance device according to claim 8, characterized in that: The floating displacement mechanism also includes a sliding rod and a retaining spring sleeved on the sliding rod. The sliding rod is connected to the reduction box and is used to guide the reduction box to move along the Z-axis direction. The retaining spring abuts against the reduction box.

10. The electrode cap maintenance device according to claim 1, characterized in that: It also includes a position sensor, which is used to detect the relative position of the fixed welding clamp and the gear box.

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