Angle calibration device for spot welding tongs

Abstract

The utility model provides an angle calibration device for spot welding tongs. The angle calibration device comprises a supporting mechanism, a detection mechanism and a control system, the supporting mechanism is fixedly connected with the welding tongs and is used for adjusting and fixing the position of the detection mechanism; the detection mechanism is arranged on the supporting mechanism in a manner of moving up and down, and the detection mechanism comprises a plurality of detection elements and is used for measuring the distance between the detection elements and the surface of the workpiece; and the control system is used for receiving the detection data output by the detection element and analyzing the data so as to control and adjust the angle between the electrode holder and the workpiece. The detection mechanism is arranged on the electrode holder, the angle between the electrode holder and a workpiece is accurately measured in real time, the position of the electrode holder is adjusted through the control system, the electrode holder is kept perpendicular to the surface of the workpiece, and then the welding quality is improved; the problems that the welding quality is affected and defective products appear due to poor precision caused by manual calibration of the angle of the welding tongs are solved, and meanwhile the detection speed and the efficiency are high.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical automation, in particular to a spot welding clamp angle calibration device. Background Art

[0002] Spot welding is a type of resistance welding. It mainly relies on the thermal effect of current to pressurize and energize the workpiece through the upper and lower electrodes. According to Joule's law, Q=I 2 Rt utilizes the resistance heat generated by the current flowing through the area to melt the metal and form a weld nugget. Because the upper and lower electrodes are flat, the spot welding torch must be perpendicular to the workpiece. If the electrode planes are not parallel to the workpiece, uneven power distribution will result, causing weld deformation and a weak weld, seriously affecting the quality of the finished product.

[0003] The angle calibration of the traditional robot spot welding clamp is done manually with the naked eye and experience. Taking the manual spot welding angle calibration and testing of the automobile tail frame as an example, when programming the robot, the personnel observe with their eyes whether the welding clamp is perpendicular to the workpiece, and then perform welding tests. Usually, repeated adjustments and tests are required to make the welding clamp perpendicular to the workpiece. Not only is the speed slow and the angle error large, but a large number of defective products will appear during repeated adjustments and tests. Secondly, the mechanical looseness of the welding clamp connection equipment will also cause the welding clamp to be not perpendicular to the workpiece plane. During the welding process, manual labor cannot detect deviations in time, resulting in a large number of defective products, which causes great waste. Utility Model Content

[0004] The purpose of the utility model is to provide a spot welding clamp angle calibration device to solve at least one of the above technical problems existing in the prior art.

[0005] In order to solve the above technical problems, the utility model provides a spot welding clamp angle calibration device, comprising: a support mechanism, a detection mechanism and a control system;

[0006] The support mechanism is fixedly connected to the welding clamp and is used to adjust and fix the position of the detection mechanism;

[0007] The detection mechanism is movably arranged on the support mechanism, and includes a plurality of detection elements for measuring the distance between the detection elements and the surface of the workpiece;

[0008] The control system is used to receive the detection data output by the detection element and analyze the data, thereby controlling and adjusting the angle between the welding clamp and the workpiece.

[0009] Furthermore, the support mechanism includes a support sleeve, a plurality of connecting rod structures and a connecting sleeve;

[0010] The support sleeve is fixedly mounted on the outside of the welding clamp and is used for fixed connection between the support mechanism and the welding clamp;

[0011] A plurality of connecting rod structures are fixedly provided at the bottom of the supporting sleeve and are evenly arranged along the circumference of the bottom of the supporting sleeve, for movably connecting the supporting sleeve and the connecting sleeve;

[0012] The connecting sleeve can be mounted on the outside of the supporting sleeve in a manner of being lifted up and down, and is used for adjusting and fixing the position of the detection mechanism.

[0013] The up and down movement of the detection mechanism meets the position requirements of welding tongs of different lengths for the detection mechanism, avoiding the occurrence of blind spots in the detection mechanism and affecting the accuracy of the detection.

[0014] Furthermore, the connecting rod structure includes a first connecting rod and a second connecting rod;

[0015] One end of the first connecting rod is hinged to the bottom of the supporting sleeve, and a first hinged support hinged to the first connecting rod is fixedly provided at the bottom of the supporting sleeve;

[0016] The other end of the first connecting rod is hinged to one end of the second connecting rod;

[0017] The other end of the second connecting rod is hinged to the bottom of the connecting sleeve, and a second hinged support is fixedly provided on the bottom of the connecting sleeve.

[0018] Preferably, a plurality of guide grooves are provided in the axial direction on the side wall of the connecting sleeve, and the plurality of guide grooves are evenly distributed circumferentially along the side wall of the connecting sleeve; and are used for guiding and limiting the connecting sleeve when it is raised and lowered.

[0019] Furthermore, a plurality of support rods are evenly distributed along the circumference of the side wall of the support sleeve, and the support rods are arranged perpendicular to the side wall of the support sleeve;

[0020] One end of the support rod is fixedly connected to the side wall of the support sleeve, and the other end of the support rod passes through the guide groove outward and extends out of the side wall of the connecting sleeve, so as to support the connecting sleeve.

[0021] Furthermore, the outer side wall of the connecting sleeve is threadedly connected to two locking nuts, and the locking nuts are arranged at intervals above and below the support rod in the vertical direction to lock and fix the connecting sleeve and the support sleeve.

[0022] Furthermore, the detection element is a displacement sensor, and a plurality of the displacement sensors are evenly arranged along the outer circumference of the connecting sleeve, and the sensing ends of the displacement sensors are arranged downward;

[0023] The displacement sensor is fixedly connected to the connecting sleeve via a sensor bracket.

[0024] Preferably, the displacement sensor is electrically connected to the control system.

[0025] Furthermore, the control system includes a microprocessor and an alarm module;

[0026] The microprocessor is used to receive the detection data of the detection element and analyze the detection data and then issue an instruction to control the movement of the welding clamp;

[0027] The alarm module is used to emit an audible and visual alarm.

[0028] Furthermore, a zero platform is included for position calibration of the displacement sensor.

[0029] By adopting the above technical solution, the utility model has the following beneficial effects:

[0030] The utility model provides a spot welding clamp angle calibration device, which has the following advantages:

[0031] 1. By setting up a detection mechanism on the robot welding clamp and outputting the detection data to the control system, the control system can accurately measure the angle between the welding clamp and the workpiece in real time based on the detected data and calibrate and adjust the position of the welding clamp according to the measured value, so that the welding clamp and the workpiece surface remain perpendicular, thereby improving the welding quality; avoiding the problem of poor accuracy caused by manual calibration of the welding clamp angle, which affects the welding quality and produces defective products, while at the same time, the detection speed is fast and the efficiency is high.

[0032] 2. During the spot welding process, the welding angle of each welding point is detected in real time to avoid the occurrence of batch defective products caused by welding angle deviation caused by equipment looseness and manual failure to detect in time.

[0033] 3. The overall structure of this device is simple in design and the operation is efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A three-dimensional diagram of a spot welding clamp angle calibration device provided by an embodiment of the utility model;

[0036] Figure 2An assembly diagram of a support mechanism and welding clamps in a spot welding clamp angle calibration device provided by an embodiment of the present utility model;

[0037] Figure 3 A three-dimensional diagram of a connecting rod structure in a spot welding clamp angle calibration device provided by an embodiment of the present utility model;

[0038] Figure 4 A three-dimensional diagram of a support sleeve in a spot welding clamp angle calibration device provided by an embodiment of the present utility model;

[0039] Figure 5 A three-dimensional diagram of a connecting sleeve in a spot welding clamp angle calibration device provided by an embodiment of the present utility model;

[0040] Figure 6 A three-dimensional diagram of a support mechanism in a spot welding clamp angle calibration device provided by an embodiment of the present invention with the locking nut removed.

[0041] Reference numerals:

[0042] 100-support mechanism; 110-support sleeve; 111-first articulated support; 120-connecting rod structure; 121-first connecting rod; 122-second connecting rod; 130-connecting sleeve; 131-guide groove; 132-second articulated support; 140-support rod; 150-locking nut; 200-detection mechanism; 210-laser displacement sensor; 220-clip; 300-welding clamp. DETAILED DESCRIPTION

[0043] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] The present invention will be further explained below in conjunction with specific implementation methods.

[0047] like Figure 1 As shown, the present embodiment provides a spot welding clamp angle calibration device, comprising: a support mechanism 100, a detection mechanism 200 and a control system;

[0048] The support mechanism 100 is fixedly connected to the welding clamp 300 and is used to adjust and fix the position of the detection mechanism 200;

[0049] The detection mechanism 200 is movably disposed on the support mechanism 100 , and includes a plurality of detection elements for measuring the distance between the detection elements and the surface of the workpiece;

[0050] The control system is used to receive the detection data output by the detection element and analyze the data, thereby controlling and adjusting the angle between the welding clamp 300 and the workpiece.

[0051] like Figure 2 As shown, the support mechanism 100 includes a support sleeve 110, a plurality of connecting rod structures 120 and a connecting sleeve 130;

[0052] The support sleeve 110 is fixedly mounted on the outside of the welding clamp 300 and is used for fixed connection between the support mechanism 100 and the welding clamp 300;

[0053] A plurality of connecting rod structures 120 are fixedly disposed at the bottom of the supporting sleeve 110 and are evenly arranged along the circumference of the bottom of the supporting sleeve 110 for movable connection between the supporting sleeve 110 and the connecting sleeve 130;

[0054] The connecting sleeve 130 can be mounted on the outside of the supporting sleeve 110 in a manner that it can be raised and lowered, and is used for adjusting and fixing the position of the detecting mechanism 200 .

[0055] The up and down movement of the detection mechanism 200 satisfies the position requirements of welding tongs 300 of different lengths on the detection mechanism 200, thereby avoiding the occurrence of a detection blind spot in the detection mechanism 200, which affects the detection accuracy and welding quality.

[0056] In this embodiment, four groups of connecting rod structures 120 are evenly distributed along the circumference of the bottom of the support sleeve 110.

[0057] like Figure 3-5 As shown, the connecting rod structure 120 includes a first connecting rod 121 and a second connecting rod 122;

[0058] One end of the first connecting rod 121 is hinged to the bottom of the supporting sleeve 110 , and a first hinged support 111 hinged to the first connecting rod 121 is fixedly provided at the bottom of the supporting sleeve 110 ;

[0059] The other end of the first connecting rod 121 is hinged to one end of the second connecting rod 122;

[0060] The other end of the second connecting rod 122 is hinged to the bottom of the connecting sleeve 130 , and a second hinged support 132 is fixedly provided at the bottom of the connecting sleeve 130 .

[0061] The side wall of the connecting sleeve 130 is provided with a plurality of guide grooves 131 along the axial direction, and the plurality of guide grooves 131 are evenly distributed along the circumference of the side wall of the connecting sleeve 130 ; they are used for guiding and limiting the connecting sleeve 130 when it is raised and lowered.

[0062] In this embodiment, four guide grooves 131 are evenly distributed along the circumference of the side wall of the connecting sleeve 130 .

[0063] like Figure 6 As shown, a plurality of support rods 140 are evenly distributed along the circumferential direction on the side wall of the support sleeve 110 , and the support rods 140 are arranged perpendicular to the side wall of the support sleeve 110 ;

[0064] One end of the support rod 140 is fixedly connected to the side wall of the support sleeve 110 , and the other end of the support rod 140 passes through the guide groove 131 outward and extends out of the side wall of the connecting sleeve 130 for supporting the connecting sleeve 130 .

[0065] In this embodiment, four support rods 140 are evenly arranged along the circumference of the side wall of the support sleeve 110 .

[0066] Two locking nuts 150 are threadedly connected to the outer wall of the connecting sleeve 130 . The locking nuts 150 are vertically spaced above and below the support rod 140 for locking and fixing the connecting sleeve 130 and the support sleeve 110 .

[0067] Furthermore, the detection element is a displacement sensor, and a plurality of the displacement sensors are evenly arranged along the outer circumference of the connecting sleeve 130, and the sensing end of the displacement sensor is set downward;

[0068] The displacement sensor is fixedly connected to the connecting sleeve 130 via a sensor bracket.

[0069] In this embodiment, the displacement sensor is a laser displacement sensor 210 , and the sensor bracket is a buckle 220 .

[0070] The laser displacement sensor 210 is electrically connected to the control system.

[0071] The control system (not shown) includes a microprocessor and an alarm module;

[0072] The microprocessor is used to receive the detection data of the detection element and analyze the detection data and then issue an instruction to control the movement of the welding clamp 300;

[0073] The alarm module is used to emit an audible and visual alarm.

[0074] In this embodiment, the control system further includes a display for displaying the received detection values and the output values.

[0075] In addition, the device further comprises a zero platform (not shown) for calibrating the position of the displacement sensor.

[0076] In this embodiment, the zero platform is a rectangular metal block with a magnet on one side, and the other surface opposite to the magnet surface is treated with soft light, and a cross mark is engraved on the soft light surface.

[0077] Specifically, during welding, the robot welding clamp 300 is first placed perpendicular to the soft light plane of the zero platform, and the angle values of the three laser displacement sensors 210 and the soft light plane are adjusted so that the three angle values are equal and 90°, thus completing the position calibration of the laser displacement sensor 210. The end of the robot welding clamp 300 is then moved to the desired welding position, and the three laser displacement sensors 210 respectively detect the distance between them and the surface of the workpiece to be welded, and transmit the detection data to the microprocessor. When the difference between the distances measured by the three laser displacement sensors 210 is greater than a preset threshold, the microprocessor calculates the deviation angle between the welding clamp 300 and the workpiece surface, and transmits the deviation angle to the robot via the industrial bus. The robot then drives the welding clamp 300 to perform corresponding movements, adjusts the welding clamp 300 to a position perpendicular to the surface to be welded, and then performs the welding operation, thereby improving the welding quality.

[0078] During the subsequent spot welding process, each welding point will be detected in real time. When the detected tilt angle of the welding clamp 300 is greater than the preset threshold, the equipment will stop running and the alarm module will emit an audible and visual alarm to remind the staff to make adjustments to avoid batch unqualified welding quality, greatly reducing production costs.

[0079] The utility model provides a spot welding clamp angle calibration device, which has the following advantages:

[0080] 1. By setting up a detection mechanism on the robot welding clamp and outputting the detection data to the control system, the control system can accurately measure the angle between the welding clamp and the workpiece in real time based on the detected data and calibrate and adjust the position of the welding clamp according to the measured value, so that the welding clamp and the workpiece surface remain perpendicular, thereby improving the welding quality; avoiding the problem of poor accuracy caused by manual calibration of the welding clamp angle, which affects the welding quality and produces defective products, while at the same time, the detection speed is fast and the efficiency is high.

[0081] 2. During the spot welding process, the welding angle of each welding point is detected in real time to avoid the occurrence of batch defective products caused by welding angle deviation caused by equipment looseness and manual failure to detect in time.

[0082] 3. The overall structure of this device is simple in design and the operation is efficient and convenient.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spot welding clamp angle calibration device, characterized in that: include: Support mechanism, detection mechanism and control system; The support mechanism is fixedly connected to the welding clamp and is used to adjust and fix the position of the detection mechanism; The detection mechanism is movably arranged on the support mechanism, and includes a plurality of detection elements for measuring the distance between the detection elements and the surface of the workpiece; The control system is used to receive the detection data output by the detection element and analyze the data, thereby controlling and adjusting the angle between the welding clamp and the workpiece.

2. The spot welding clamp angle calibration device according to claim 1, characterized in that: The support mechanism includes a support sleeve, a plurality of connecting rod structures and a connecting sleeve; The support sleeve is fixedly mounted on the outside of the welding clamp and is used for fixed connection between the support mechanism and the welding clamp; A plurality of connecting rod structures are fixedly provided at the bottom of the supporting sleeve and are evenly arranged along the circumference of the bottom of the supporting sleeve, for movably connecting the supporting sleeve and the connecting sleeve; The connecting sleeve can be mounted on the outside of the supporting sleeve in a manner of being lifted up and down, and is used for adjusting and fixing the position of the detection mechanism.

3. The spot welding clamp angle calibration device according to claim 2, characterized in that: The connecting rod structure includes a first connecting rod and a second connecting rod; One end of the first connecting rod is hinged to the bottom of the supporting sleeve, and a first hinged support hinged to the first connecting rod is fixedly provided at the bottom of the supporting sleeve; The other end of the first connecting rod is hinged to one end of the second connecting rod; The other end of the second connecting rod is hinged to the bottom of the connecting sleeve, and a second hinged support is fixedly provided on the bottom of the connecting sleeve.

4. The spot welding clamp angle calibration device according to claim 2, characterized in that: The side wall of the connecting sleeve is provided with a plurality of guide grooves along the axial direction, and the plurality of guide grooves are evenly distributed along the circumference of the side wall of the connecting sleeve; and are used for guiding and limiting the connecting sleeve when it is lifted up and down.

5. The spot welding clamp angle calibration device according to claim 4, characterized in that: The side wall of the support sleeve is evenly distributed with a plurality of support rods along the circumference, and the support rods are arranged perpendicular to the side wall of the support sleeve; One end of the support rod is fixedly connected to the side wall of the support sleeve, and the other end of the support rod passes through the guide groove outward and extends out of the side wall of the connecting sleeve, so as to support the connecting sleeve.

6. The spot welding clamp angle calibration device according to claim 5, characterized in that: The outer side wall of the connecting sleeve is threadedly connected to two locking nuts, and the locking nuts are arranged at intervals above and below the support rod in the vertical direction to lock and fix the connecting sleeve and the support sleeve.

7. The spot welding clamp angle calibration device according to claim 2, characterized in that: The detection element is a displacement sensor, and a plurality of the displacement sensors are evenly distributed along the outer circumference of the connecting sleeve, and the sensing ends of the displacement sensors are arranged downward; The displacement sensor is fixedly connected to the connecting sleeve via a sensor bracket.

8. The spot welding clamp angle calibration device according to claim 7, characterized in that: The displacement sensor is electrically connected to the control system.

9. The spot welding clamp angle calibration device according to claim 7, characterized in that: The control system includes a microprocessor and an alarm module; The microprocessor is used to receive the detection data of the detection element and analyze the detection data and then issue an instruction to control the movement of the welding clamp; The alarm module is used to emit an audible and visual alarm.

10. The spot welding clamp angle calibration device according to claim 7, characterized in that: A zero platform is also included for initial position calibration of the displacement sensor.

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