Resistance welding device

Abstract

A resistance welding device comprises a clamp, a fixed electrode, a movable electrode, an air cylinder system, a locking latch, a groove, a driving device, a rotating shaft and a pivot connecting rod, the front end of the clamp is connected with the fixed electrode, the rear end of the clamp is connected with the driving device through the pivot connecting rod, the air cylinder system is connected with the movable electrode, and the locking latch is connected with the groove. One end of the locking latch is connected with the pivot connecting rod through a rotating shaft, the other end of the locking latch is connected with the driving device, and the driving device is connected with the movable electrode. Compared with the prior art, the movable electrode is improved to have two standing positions, and different standing positions can be selected according to different welding workpieces, so that the welding time is saved, and the welding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of automobile sheet metal maintenance, in particular to a resistance welding device. Background Art

[0002] Resistance welding equipment has a method of generating a very strong electric current that is passed through the electrodes via electrical contacts contained in each electrode. The electrodes are configured to clamp materials, including metallic elements, in order to weld them together by forming a weld.

[0003] During the creation of the weld, a very high current flows between the electrodes, heating the material because the resistance of the weld is greater than the resistance of the electrodes. For example, a very high current of between 1000A and 15000A can be passed through the electrodes.

[0004] Resistance welding equipment typically features a C-shaped arm with a clamp, consisting of a first portion supporting a fixed electrode and a second portion supporting a translationally movable electrode. The welding equipment also includes an actuator, such as a pneumatic cylinder, that controls and transmits linear motion to the moving electrode.

[0005] Traditionally, the linear motion of the mobile electrode from the rest position to the working position is controlled by a pneumatic cylinder.

[0006] One disadvantage of these resistance welding devices is that the distance between the working position and the rest position of the moving electrode is fixed. In particular, this distance is predefined and optimized according to the geometry and thickness of the material to be welded.

[0007] To overcome this shortcoming, existing resistance welding devices can increase the distance by manually manipulating the movable electrode of the fixture to move it away from the fixed electrode, i.e., retracting the movable electrode. For example, the method of locking the movable electrode in a stationary position may include a clamping device, such as a clamping ring, to which the movable electrode is locked and cannot be moved further away from the fixed electrode.

[0008] However, with this clamping device, the operator must manually move the moving electrode to change its resting position. In addition, the clamping efficiency of this clamping method inevitably decreases over time, especially during the clamping and loosening cycles.

[0009] To address the above issues, we have made a series of improvements. Utility Model Content

[0010] The purpose of the present invention is to provide a resistance welding device to overcome the above-mentioned shortcomings and deficiencies in the prior art.

[0011] A resistance welding device includes: a clamp, a fixed electrode, a movable electrode, a cylinder system, a locking latch, a groove, a drive device, a rotating shaft and a pivot link, wherein the front end of the clamp is connected to the fixed electrode, the rear end of the clamp is connected to the drive device via a pivot link, the cylinder system is connected to the movable electrode, the locking latch is connected to the groove, one end of the locking latch is connected to the pivot link via a rotating shaft, the other end of the locking latch is connected to the drive device, and the drive device is connected to the movable electrode.

[0012] Furthermore, the cylinder system includes: a cylinder chamber, a cylinder rod and a sliding piston, one end of the cylinder rod is connected to the moving electrode, the other end of the cylinder rod is connected to the center hole of the sliding piston, and a cylinder chamber is provided on one side of the sliding piston.

[0013] Furthermore, the locking latch is provided with a locking finger, the groove is provided with a stopper, and the blocking surface of the locking finger is connected to the stopper during use.

[0014] Furthermore, the driving device includes: a callback spring, a slider, a connecting rod element, a release rod and a release finger, the callback spring is fixed inside the sliding piston, the slider is connected to the moving electrode through an opening hole, one end of the slider is connected to the locking latch through a connecting rod element, the other end of the slider is connected to one end of the release rod, the other end of the release rod is connected to the release finger, the release rod is provided with a callback spring, the callback spring is connected to the slider, and the release rod is connected to the rear end of the clamp through a pivot link.

[0015] Beneficial effects of the utility model:

[0016] Compared with the traditional technology, the utility model improves the movable electrode to have two static positions, so that different static positions can be selected according to different welding workpieces, thereby saving welding time and improving welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Figure 2 This is a diagram of the usage state of the utility model.

[0019] Figure 3 This is another usage state diagram of the utility model.

[0020] Figure 4 It is a schematic diagram of the internal structure of the utility model.

[0021] Figure 5 This is another schematic diagram of the internal structure of the present invention.

[0022] Figure 6This is a schematic diagram of the internal structure of the utility model in a front view state.

[0023] Figure 7 This is a schematic diagram of the internal structure of the utility model in another front view state.

[0024] Reference numerals:

[0025] The jig 100 , the fixed electrode 200 , the moving electrode 300 , the cylinder system 400 , the cylinder chamber 410 , the cylinder rod 420 , and the sliding piston 430 .

[0026] Locking latch 500 , locking finger 510 , groove 600 and stop 610 .

[0027] Drive device 700 , return spring 710 , slide 720 , linkage element 730 , release lever 740 and release finger 750 .

[0028] Rotation shaft 800 and pivot link 900 .

[0029] Working position P0, first rest position P1, second rest position P2, first distance D1 and second distance D2. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0031] Example 1

[0032] Figure 1 It is a structural diagram of the present utility model. Figure 2 This is a diagram of the usage state of the utility model. Figure 3 This is another usage state diagram of the utility model. Figure 4 It is a schematic diagram of the internal structure of the utility model. Figure 5 This is another schematic diagram of the internal structure of the present invention. Figure 6 This is a schematic diagram of the internal structure of the utility model in a front view state. Figure 7 This is a schematic diagram of the internal structure of the utility model in another front view state.

[0033] like Figure 1-7As shown, a resistance welding device includes: a clamp 100, a fixed electrode 200, a movable electrode 300, a cylinder system 400, a locking latch 500, a groove 600, a driving device 700, a rotating shaft 800 and a pivot link 900, the front end of the clamp 100 is connected to the fixed electrode 200, the rear end of the clamp 100 is connected to the driving device 700 through the pivot link 900, the cylinder system 400 is connected to the movable electrode 300, the locking latch 500 is connected to the groove 600, one end of the locking latch 500 is connected to the pivot link 900 through the rotating shaft 800, the other end of the locking latch 500 is connected to the driving device 700, and the driving device 700 is connected to the movable electrode 300.

[0034] The cylinder system 400 includes: a cylinder chamber 410, a cylinder rod 420 and a sliding piston 430. One end of the cylinder rod 420 is connected to the moving electrode 300, and the other end of the cylinder rod 420 is connected to the center hole of the sliding piston 430. The cylinder chamber 410 is provided on one side of the sliding piston 430.

[0035] The locking latch 500 is provided with a locking finger 510 , and the groove 600 is provided with a stopper 610 , and the blocking surface of the locking finger 510 is connected to the stopper 610 during use.

[0036] The driving device 700 includes: a callback spring 710, a slider 720, a connecting rod element 730, a release rod 740 and a release finger 750. The callback spring 710 is fixed inside the sliding piston 430. The slider 720 is connected to the moving electrode 300 through an opening hole. One end of the slider 720 is connected to the locking latch 500 through the connecting rod element 730. The other end of the slider 720 is connected to one end of the release rod 740. The other end of the release rod 740 is connected to the release finger 750. The release rod 740 is provided with a callback spring 710. The callback spring 710 is connected to the slider 720. The release rod 740 is connected to the rear end of the clamp 100 through a pivot link 900.

[0037] In the present invention, the fixture 100 is used to perform the "C" motion of the fixture and resistance welding. The movable electrode 300 can move between a clamping position (i.e., working position P0) and a rest position. The movable electrode 300 can also move from a first rest position P1 to a second rest position P2, which is farther from the working position P0 than from the working position P0 to the first rest position P1. Thus, the movable electrode 300 can have two rest positions, and different rest positions can be selected based on the welded workpiece, thereby saving welding time and improving welding efficiency.

[0038] Furthermore, movement of the mobile electrode 300 between its rest position and the withdrawn position does not require manual manipulation of the mobile electrode 300 .

[0039] To this end, the electrode is intended to pass through and enclose the metal element for welding by electric current, and the mobile electrode 300 is configured to move between the following: a working position P0 in which the electrode clamps the metal element to be welded, a first rest position P1, allowing the metal element to be welded to be inserted between the fixed electrode 200 and the mobile electrode 300 placed opposite each other, wherein the mobile electrode 300 is in the first rest position P1 and is located at a first distance D1 from the fixed electrode 200, and a second rest position P2, allowing the metal element to be welded to be inserted between the fixed electrode 200 and the mobile electrode 300 placed opposite each other, wherein the mobile electrode 300 is in the second rest position P2 and is located at a second distance D2 from the fixed electrode 200, which is greater than the first distance D1.

[0040] The driving device 700 is used to lock the movable electrode 300 at the first static position P1 and allows the movable electrode 300 to move to the second static position P2 under the action of the retraction device.

[0041] The combination of the locking latch 500, the groove 600, the drive device 700 and the cylinder system 400 allows the movable electrode 300 to be easily moved from the first rest position P1 to the second rest position P2. In particular, the callback device makes it possible to ensure that the movable electrode 300 automatically moves from the first rest position P1 to the second rest position P2 without manual intervention on the movable electrode 300, but by acting on a drive button configured to activate the drive device 700.

[0042] Furthermore, the clamp 100 is allowed to open more and allows the insertion of a metal element between the fixed electrode 200 and the mobile electrode 300, such as a vehicle body panel, the thickness of which is greater than the distance between the working position P0 of the mobile electrode 300 and its first rest position P1, where it would be mechanically blocked if there were no external forces operating the device.

[0043] Furthermore, when the metal elements to be welded include an obstacle, for example, when the sheet material used to manufacture the body of an automobile includes a body element having a thickness greater than the distance between the working position P0 and the first rest position P1, it is possible to bypass it to perform welding at a specific point on the other side of the obstacle.

[0044] The operating principles of the utility model include:

[0045] The clamp 100 is held by an operator or connected to the end of a robotic arm. The fixed electrode 200 and the movable electrode 300 are designed to pass an electric current through them so as to weld the metal components enclosed between the fixed electrode 200 and the movable electrode 300 by forming a weld point. This electric current passes through the fixed electrode 200 and the movable electrode 300 to weld the workpieces they clamp.

[0046] The moving electrode 300 is mounted on a cylinder rod 420. In this embodiment, the cylinder system 400 is a single-acting cylinder with a predefined stroke length. The cylinder rod 420 is inserted into the cylinder system 400 and slides within the cylinder system 400. The cylinder rod 420 then carries the moving electrode 300 at one end and a sliding piston 430 at the other end, which slides into the cylinder system 400. The moving electrode 300 is then moved by the forward and backward motion of the cylinder.

[0047] The cylinder rod 420 is fixed to the center hole of the sliding piston 430, and a return spring 710 is fixed inside the sliding piston. Under the action of pressure, the return spring 710 drives the sliding piston 430 to move, thereby driving the cylinder rod 420 to move. A cylinder chamber 410 is located on one side of the sliding piston 430. The forward and backward movement of the cylinder system 400 is then activated by alternately applying fluid pressure to the cylinder chamber 410 to form a vacuum. The fluid pressure in the cylinder chamber 410 is generated by pressurizing a pneumatic fluid (such as compressed air), while the fluid vacuum is activated by removing a certain volume of compressed air contained in the cylinder chamber 410.

[0048] Thus, the movable electrode 300 is driven by the cylinder rod 420 in translation along a first direction along the longitudinal axis X, and in a second direction opposite to the first direction along the longitudinal axis X. Therefore, when the cylinder chamber 410 is in a state of high fluid pressure, the cylinder rod 420, on the one hand, advances in the first direction, causing the movable electrode 300 and the fixed electrode 200 to clamp the metal component. On the other hand, when the cylinder chamber 410 is in a state of low fluid pressure, the cylinder rod 420 moves backward in the second direction, releasing the movable electrode 300 from the metal component and removing it from the fixed electrode 200 after the weld is formed.

[0049] When the cylinder chamber 410 enters a low fluid pressure state, the moving electrode 300 is released from the metal element. When the cylinder chamber 410 enters a low fluid pressure state, the return spring 710 of the sliding piston 430 ensures translational displacement of the cylinder rod 420 in the second direction. In this embodiment, the return spring 710 is a tension spring. The sliding piston 430 is mounted on the return spring 710. When the return spring 710 relaxes, it exerts a restoring force on the cylinder rod 420, causing the cylinder rod 420 to move in the second direction when the cylinder chamber 410 enters a low fluid pressure state. When the operator continuously presses the control button to activate the supply of compressed air to the cylinder chamber 410, placing it in a high fluid pressure state, the first-direction translation drive mechanism of the cylinder rod 420 engages. When the operator stops pressing the control button to maintain the low fluid pressure state in the cylinder chamber 410, the second-direction translation drive mechanism of the cylinder rod 420 engages. This allows the cylinder rod 420 to move rearwardly over the entire length of the stroke of the cylinder system 400 under the action of the return spring 710, if such displacement is permitted, ie if the cylinder rod 420 is not blocked at any position during this time.

[0050] Figure 1 The clamp 100 is shown opened in a first open position. Specifically, the mobile electrode 300 is in a first static position P1 in which the metal element to be welded is inserted between the fixed electrode 200 and the mobile electrode 300.

[0051] Then, the moving electrode 300 is positioned at a first distance D1 from the fixed electrode 200 .

[0052] The moving electrode 300 cannot move away from the fixed electrode 200. In fact, this distance is blocked by a blocking device, which will be described later. The first distance D1 is smaller than the stroke length of the cylinder system 400.

[0053] Figure 2 The clamp 100 is shown closed. The movable electrode 300 is shown in the working position P0, where welding can be performed on a metal component. When the clamp is engaged, the movable electrode 300 moves from the first rest position P1 to the working position P0, i.e., when the high pressure in the cylinder chamber 410 causes the cylinder rod 420 to move forward. The movable electrode 300 then approaches the fixed electrode 200 to stabilize in the working position P0.

[0054] It should be noted that when the clamp 100 is opened, the movable electrode 300 also moves from the working position P0 (eg Figure 2 As shown) moves to the first stationary position P1 (as shown Figure 1 In particular, during this displacement process, the cylinder rod 420 moves backward until the locking device is locked.

[0055] After acting on the blocking means to unlock them, the electrode 300 is moved from the first rest position P1 to the Figure 3 The second rest position P2 is shown. When it is necessary to over-open the clamp 100 to open it further, the operator authorizes the movement.

[0056] Specifically, Figure 3 The clamp 100 is shown opened according to the second open position. In the second open position, when the movable electrode is in the first static position P1, a metal element to be welded, which is thicker than the metal element that can be inserted through the clamp 100, can be inserted between the fixed electrode 200 and the movable electrode 300.

[0057] It should be noted that in the second open position, the mobile electrode 300 is therefore located at a second distance D2 from the fixed electrode 200 , which distance is greater than the first distance D1 .

[0058] Thus, when the cylinder chamber 410 is placed under low pressure so as to move the cylinder rod 420 backwards under the action of the return spring 710 connected to the sliding piston, the mobile electrode 300 moves from the working position P0 to the first rest position P1 and then to the second rest position P2 when this movement is authorized, i.e. when the cylinder rod 420 is not blocked by the blocking means.

[0059] Figure 4 and Figure 5 Indicates an example of implementing blocking means. Specifically, Figure 4 Indicates that the clamp is locked in the locked position, while Figure 5 The locking clamp is shown in the unlocked position (i.e., in the released position of the cylinder rod 420). The recess 600 has a transverse wall along the longitudinal axis X, forming a stopper 610 that contacts the blocking surface of the locking finger 510. The blocking surface is a flat surface. The blocking surface is located below the stopper 610, and the operator can engage or disengage the blocking surface according to work needs.

[0060] The locking latch 500 is an integral part of the aforementioned drive mechanism. When a force is applied to the locking latch, the drive mechanism is configured to move the locking latch 500 from Figure 4 The locked position shown is lowered to Figure 5 Release position shown.

[0061] Specifically, the actuation device is configured to maintain the locking latch 500 elevated when not actuated, such that the locking finger 510 is flush with the smooth surface of the groove 600 when the smooth surface of the groove 600 faces the smooth surface of the groove 600. Thus, when the moving electrode 300 moves between the operating position P0 and the first rest position P1, the stopper 610 moves translationally along the longitudinal axis X while the locking finger 510 maintains contact with the smooth surface of the groove 600. Therefore, when the blocking surface of the locking finger 510 contacts the stopper 610, displacement of the moving electrode from the first rest position P1 to the second rest position P2 is blocked.

[0062] To allow the cylinder rod 420 to move backwards in order to move the moving electrode 300 from the first rest position P1 to the second rest position P2, the operator applies a force on the drive device to lower the locking latch 500 so as to remove the locking finger 510 from the groove 600. This prevents the locking surface of the locking finger from contacting the stop 610.

[0063] The locking latch 500 is rectangular and has two ends. Therefore, in order to raise and lower it, its first end is mounted with a swivel device that rotates around a rotation axis 800, which is connected to a pivot link 900 connecting the first end of the locking latch 500 and the second part of the arm.

[0064] The second end of the locking latch 500 is connected to the driving device 700, according to Figure 6 and Figure 7 In the illustrated design example, the actuator 700 includes a slider 720, a release lever 740, a release finger 750, and a return spring 710 configured to hold the locking latch 500 raised when the release lever 740 is not activated. It should be noted that the release finger 750 can take the form of any type of actuator button.

[0065] The slider 720 is rectangular and has two ends. The slider 720 also has an open hole through which the moving electrode 300 is introduced to enable translational movement between the various positions described above. The first end of the slider 720 is connected to the second end of the locking latch 500. Here, the link element 730 is an extension of the first end of the plunger and interlocks with the second end of the locking latch 500 to form a movable connection between the locking latch 500 and the slider 720.

[0066] One end of the release lever 740 cooperates with the slider 720 and the other end of the release lever 740 coincides with the release finger 750. The lever is mounted in a rotatable manner around a pivot link 900 which is made at an oblique angle to allow the slider 720 to move.

[0067] When the slider 720 is in the upright position, as shown Figure 4 and Figure 6As shown, the locking finger of the locking latch 500 is inserted into the groove 600. Then, the moving electrode 300 is blocked in the first static position P1. When the slider 720 is in the lowered position, as shown in FIG. Figure 5 and Figure 7 As shown, the locking finger 510 is removed from the recess 600. In this case, a portion of the first end of the slider 720 and / or a portion of the second end of the locking latch 500, along with the linkage element 730, are housed in a suitable housing formed into one end of the clamp arm. The mobile electrode 300 is then brought to the second rest position P2. When the operator manually activates the release of the locking device by applying force to the release finger 750, the slider 720 moves from its raised position to its lowered position. The slider 720 is moved from its lowered position to its raised position by applying a force exerted by the return element. When no force is directly applied to the release finger 750, the slider 720 remains in its raised position by the force exerted by the return element.

[0068] The rod of the release lever 740 is mounted on a return spring 710, which is a compression spring. Therefore, when the return spring 710 is compressed, the pressure of the return spring 710 exerts a force on the slider 720, causing it to naturally rise, thereby preventing it from moving from its raised position to its lowered position. This allows the locking finger of the locking latch 500 to remain in the groove 600 to prevent the cylinder rod from moving backward when no force is applied to the release finger 750.

[0069] Release lever 740 is connected to the second portion of the clamp via pivot link 900. Thus, when the operator applies a rotational force to release finger 750, slider 720 moves from its raised position to its lowered position. For example, the rotational force that the operator must apply to release finger 750 to unlock the locking mechanism is a counterclockwise force. It should be noted that release finger 750 is then naturally moved by the force applied by return spring 710 to move clockwise to restore its equilibrium position, i.e., the position when slider 720 is in its raised position.

[0070] It should be noted that when the release finger 750 is in its equilibrium position, the locking and actuating means is rigid enough not to deform.

[0071] The above-described clamp 100 has the advantage of being able to be opened in two open positions: one open position corresponding to the first stationary position P1 of the movable electrode 300, and the other open position corresponding to the second stationary position P2 of the movable electrode 300. This allows the clamp 100 to be used with metal components whose thickness is greater than the separation distance between the fixed electrode 200 and the movable electrode 300 in the first stationary position P1. This also simplifies positioning the electrodes on either side of the metal component to be welded when access to these components is limited or difficult. This operation can be performed without manually manipulating the electrodes or using a pneumatic circuit.

[0072] Compared with the traditional technology, the utility model improves the movable electrode to have two static positions, so that different static positions can be selected according to different welding workpieces, thereby saving welding time and improving welding efficiency.

[0073] The above describes the specific implementation of the present invention, but the present invention is not limited thereto. As long as it does not deviate from the purpose of the present invention, the present invention can also have various changes.

Claims

1. A resistance welding device, characterized in that: include: A clamp (100), a fixed electrode (200), a movable electrode (300), a cylinder system (400), a locking latch (500), a groove (600), a driving device (700), a rotating shaft (800) and a pivot link (900), wherein the front end of the clamp (100) is connected to the fixed electrode (200), the rear end of the clamp (100) is connected to the driving device (700) via the pivot link (900), the cylinder system (400) is connected to the movable electrode (300), the locking latch (500) is connected to the groove (600), one end of the locking latch (500) is connected to the pivot link (900) via the rotating shaft (800), the other end of the locking latch (500) is connected to the driving device (700), and the driving device (700) is connected to the movable electrode (300).

2. A resistance welding device according to claim 1, characterized in that: The cylinder system (400) includes: a cylinder chamber (410), a cylinder rod (420) and a sliding piston (430). One end of the cylinder rod (420) is connected to the movable electrode (300), and the other end of the cylinder rod (420) is connected to the center hole of the sliding piston (430). The cylinder chamber (410) is provided on one side of the sliding piston (430).

3. A resistance welding device according to claim 1, characterized in that: The locking latch (500) is provided with a locking finger (510), and the groove (600) is provided with a stopper (610), and the blocking surface of the locking finger (510) is connected to the stopper (610) when in use.

4. A resistance welding device according to claim 2, characterized in that: The driving device (700) includes: a callback spring (710), a slider (720), a connecting rod element (730), a release rod (740) and a release finger (750), wherein the callback spring (710) is fixed inside the sliding piston (430), the slider (720) is connected to the moving electrode (300) through an opening hole, one end of the slider (720) is connected to the locking latch (500) through the connecting rod element (730), the other end of the slider (720) is connected to one end of the release rod (740), and the other end of the release rod (740) is connected to the release finger (750), the release rod (740) is provided with a callback spring (710), the callback spring (710) is connected to the slider (720), and the release rod (740) is connected to the rear end of the clamp (100) through a pivot link (900).

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