CN213379797U - Device for automatically evaluating electrode centering state of resistance spot welding tongs - Google Patents
Device for automatically evaluating electrode centering state of resistance spot welding tongs Download PDFInfo
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- CN213379797U CN213379797U CN202021116800.7U CN202021116800U CN213379797U CN 213379797 U CN213379797 U CN 213379797U CN 202021116800 U CN202021116800 U CN 202021116800U CN 213379797 U CN213379797 U CN 213379797U
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Abstract
The utility model discloses an automatic evaluate device of resistance spot welding electrode centering state, in the device, the test block is released cylinder push rod tip and is just facing test block propelling movement mouth, realize releasing the test block from test block storage unit, the CCD camera that two sets of longitudinal symmetries set up install test block storage unit front side and with test block storage unit between be equipped with electric welding station, test block mechanical clamping jaw is installed at clamping jaw control jar push rod tip and is just facing test block storage unit's test block delivery outlet, test block mechanical clamping jaw is at test block storage unit's test block delivery outlet under clamping jaw control jar's drive, horizontal reciprocating motion between electric welding station and two sets of CCD cameras, control analysis unit respectively with CCD camera, the cylinder is released to the test block, test block mechanical clamping jaw and clamping jaw control jar control signal are connected. The device can simply, directly perceived and evaluate spot welding electrode's centering state completely, and then guide spot welding problem analysis and spot welding tongs's maintenance.
Description
Technical Field
The utility model belongs to the technical field of spot welding equipment performance detects, concretely relates to automatic evaluate device of resistance spot welding electrode centering state.
Background
In the prior art, when spot welding equipment is used for spot welding of parts, if the centering performance of an upper electrode and a lower electrode is poor, welding quality defects such as splashing on the surface of a welding spot, inconsistent or uneven depth of the indentation of the welding spot and the like are easy to occur, the maximum electrode pressure available for a welding tongs is reduced, the aging or abrasion of mechanical parts such as an electrode connecting rod or a welding tongs arm and the like is accelerated, and the service life and the rigidity of the welding tongs are reduced; meanwhile, the reduction in rigidity of the electrode holder causes further deterioration in the centering state of the spot welding electrode during welding. Therefore, monitoring and evaluating the centering performance of the spot welding electrode and adjusting the spot welding electrode in time are necessary for improving the welding quality and controlling the operation cost.
Since the spot welding electrode is elastically deformed when electrode pressure is applied to the workpiece, centering of the electrode is generally deteriorated; when the power is supplied, the materials between the electrode and the workpiece and between the workpiece and the workpiece are heated and melted, so that the friction coefficient of the contact part is changed, and therefore, the displacement and the plastic deformation are easily generated between the electrode and the workpiece and between the workpiece and the workpiece, which further deteriorates the centering performance of the electrode; furthermore, when the rigidity of the electrode holder is problematic, the influence of pressurization and energization on the neutrality of the electrode becomes more significant.
In conclusion, the spot welding electrode centering performance in the actual spot welding process is changed along with the changes of factors such as electrode pressure, electrode holder rigidity, friction force between an electrode and a workpiece, friction force between the workpiece and the like on the basis of no-load centering performance of the spot welding electrode, and is not a fixed value.
In the prior art, all detection devices for detecting the centering property of a spot welding electrode are used for detecting whether specific numerical values of centering property characterization parameters of the spot welding electrode are in a qualified range at a certain stage (for example, corresponding stages such as no-load, after pressurization or after electrification) in a spot welding process, and the detection devices in the prior art have the following defects:
1. the result of the spot welding electrode centering in a single stage in the spot welding process detected by the conventional detection device cannot completely reflect the influence of the spot welding electrode centering on the welding quality.
2. The relation between the centering detection result of the spot welding electrode detected by the existing detection device and the welding quality is not visual, and the actual problem analysis is not facilitated.
Disclosure of Invention
To the defect that exists among the above-mentioned prior art, the utility model provides an automatic aassessment resistance spot welding electrode centering state's device, the device can simply, directly perceived and evaluate spot welding electrode's centering state completely, obtain spot welding electrode centering nature and electrode holder rigidity through the analysis spot welding test block and to the data of spot welding quality influence, and then guide spot welding problem analysis and the maintenance of spot welding pliers. With the attached drawings, the technical scheme of the utility model is as follows:
a device for automatically evaluating the electrode centering state of a resistance spot welding electrode holder comprises a test piece storage unit, a control analysis unit, a CCD camera, a test piece pushing cylinder, a test piece mechanical clamping jaw and a clamping jaw control cylinder;
the test piece storage unit stores a test piece;
the test piece pushing cylinder is horizontally arranged, the end part of a push rod of the test piece pushing cylinder is right opposite to a test piece pushing port on the rear side of the test piece storage unit, and the test piece is horizontally output from a test piece output port on the front side of the test piece storage unit under the pushing of the test piece pushing cylinder;
the two groups of CCD cameras are arranged on the front side of the test piece storage unit and are arranged symmetrically up and down, and an electric welding station is arranged between the CCD cameras and the test piece storage unit;
the clamping jaw control cylinder is horizontally arranged on the front side of the CCD cameras, the test piece mechanical clamping jaw is arranged at the end part of a push rod of the clamping jaw control cylinder and faces the test piece output port of the test piece storage unit, and the test piece mechanical clamping jaw is driven by the clamping jaw control cylinder to horizontally reciprocate among the test piece output port of the test piece storage unit, the electric welding station and the two groups of CCD cameras;
and the control analysis unit is respectively connected with the CCD camera, the test piece pushing cylinder, the test piece mechanical clamping jaw and the clamping jaw control cylinder through control signals.
Furthermore, a sliding pressure block is arranged in the test piece storage unit, a pressure spring is arranged between the sliding pressure block and the bottom of the test piece storage unit, the test piece is superposed above the sliding pressure block, and the sliding pressure block pushes the test piece on a top cover of the test piece storage unit under the elastic force action of the pressure spring.
Further, a test piece sensor is mounted on the top cover of the test piece storage unit and used for detecting whether the test piece storage unit 1 has a test piece or not, and the test piece sensor is in signal connection with the control analysis unit.
Furthermore, a section of horizontal guide channel is arranged at the test piece output port of the test piece storage unit, the height in the channel of the guide channel is the thickness of two test pieces, and the channel width of the guide channel is the width of the test piece.
Further, the clamping jaw control cylinder is an electric cylinder or a pneumatic cylinder.
And further, a protective baffle is arranged on one side of the CCD camera adjacent to the spot welding station so as to realize the isolation protection of the CCD camera.
Furthermore, a test piece recovery box is arranged below the spot welding station.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the evaluation result that the device obtained can completely reflect spot welding electrode centering state to the accuracy reflects soldering turret mechanical structure state such as soldering turret rigidity and influences welding quality.
2. The device can full-automatic operation, has practiced thrift the human cost, has improved aassessment efficiency.
3. The evaluation result that the device obtained can the direct-viewing reflection spot welding electrode centering state and the relation of spot welding quality, does benefit to on-the-spot actual problem analysis.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for automatically evaluating the electrode centering state of a resistance spot welding holder according to the present invention;
FIG. 2 is a partial enlarged view of the position of the guide passage in the device of the present invention;
fig. 3 is a schematic view of the device of the present invention in a first operating state;
fig. 4 is a schematic view of the device of the present invention in a second operating state;
fig. 5 is a schematic view of the device of the present invention in a third operating state;
fig. 6 is a schematic view of the device of the present invention in a fourth operating state;
fig. 7 is a schematic view of the device of the present invention in a fifth operating state;
fig. 8 is a schematic view of the device of the present invention in a sixth operating state;
fig. 9 is a schematic view of the device of the present invention in a seventh operating state;
fig. 10 is a schematic view of the device according to the present invention in an eighth operating state;
fig. 11 is a schematic view of the device of the present invention in a ninth operating state;
fig. 12 is a schematic view of the device of the present invention in a tenth operating state;
fig. 13 is a schematic view of the device of the present invention in an eleventh operating state;
fig. 14 is a schematic view of the device of the present invention in a twelfth operating state;
fig. 15 is a schematic view of the device of the present invention in a thirteenth operating state;
fig. 16 is a schematic view of the device of the present invention in a fourteenth operating state;
FIG. 17 is a schematic view of the top of the sample block collected by the device of the present invention after electric welding;
FIG. 18 is a schematic view of the bottom of the sample block collected by the device of the present invention after electric welding;
in the figure:
1-a test piece storage unit, 2-a control analysis unit, 3-a CCD camera,
4-a protective baffle, 5-a signal line, 6-a test piece pushing cylinder,
7-guide channel, 8-test piece sensor, 9-test piece,
10-sliding pressing block, 11-test piece mechanical clamping jaw, 12-clamping jaw control cylinder,
13-electrode holder assembly;
901-upper spot welding test piece, 902-lower spot welding test piece, 903-upper spot welding indentation,
904-lower spot weld indentation.
Detailed Description
For clear and complete description of the technical solution and the specific working process of the present invention, the following embodiments are provided in conjunction with the accompanying drawings of the specification:
in the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1, the utility model discloses a device for automatically evaluating electrode centering state of resistance spot welding tongs, which mainly comprises a test piece storage unit 1, a control analysis unit 2, a CCD camera 3, a test piece pushing cylinder 6, a test piece mechanical clamping jaw 11 and a clamping jaw control cylinder 12, wherein a test piece 9 arranged in a superposed manner is stored in the test piece storage unit 1, the test piece pushing cylinder 6 is located at the rear end of the test piece storage unit 1 and is used for pushing out the test piece 9 from the test piece storage unit 1 one by one, the test piece mechanical clamping jaw 11 is used for clamping the pushed out test piece 9, the clamping jaw control cylinder 12 controls the test piece mechanical clamping jaw 11 to move linearly back and forth, the CCD camera 3 collects external form data of the test piece 9 after spot welding, the control analysis unit 2 is respectively connected with each power element and data collection element signal, so as to realize analysis and processing of the collected data, and controlling the motion of the power element.
Automatic evaluate resistance spot welding electrode centering state's device concrete component structure and concrete connection relation description as follows:
the test piece storage unit 1 is of a box-type structure, a pressure spring is vertically arranged at the bottom of the test piece storage unit 1, the bottom of the pressure spring is connected with the bottom of the test piece storage unit 1, the top of the pressure spring is connected with a sliding pressing block 10, a plurality of test pieces 9 are stacked above the sliding pressing block 10, and under the elastic force action of the pressure spring at the bottom, the sliding pressing block 10 presses the test pieces 9 onto a top cover of the test piece storage unit 1 from bottom to top;
a test piece sensor 9 is further installed on the top cover of the test piece storage unit 1, the test piece sensor 9 is used for detecting whether the test piece storage unit 1 has a test piece, the test piece sensor 9 adopts a contact switch, a through hole is formed in a sliding pressing block 10 corresponding to the position under the test piece sensor 9, when a test piece is left on the sliding pressing block 10, the through hole on the sliding pressing block 10 triggers the test piece sensor 8 due to shielding of the test piece, the test piece sensor 8 detects that the test piece is left, and when no test piece is on the sliding pressing block 10, the through hole on the sliding pressing block 10 faces the position under the test piece sensor 9 due to no shielding, at this time, no trigger signal is sent by the test piece sensor 9, and at this time, no; the test piece sensor 9 is in signal connection with the control and analysis unit 2 through a signal line 5, so as to send a detected signal indicating whether a test piece exists in the test piece storage unit 1 to the control and analysis unit 2, and provide a reference for further processing of the control and analysis unit 2;
the lateral wall upper end rear side of test block storage unit 1 is opened has test block propelling movement mouth, and the lateral wall upper end front side of test block storage unit 1 is equipped with one section horizontally direction passageway 7, as shown in fig. 2, highly be exactly the thickness of two test blocks 9 in the passageway of direction passageway 7, the channel width of direction passageway 7 is exactly the width of test block 9 to the realization is to aligning from the both sides of two upper and lower test blocks of direction passageway 7 output.
The cylinder 6 is installed in is released to the test block is installed 1 rear end of test block storage unit, and the cylinder 6 level setting is released to the test block, and the push rod end that the cylinder 6 was released to the test block is just facing to the test block propelling movement mouth of 1 rear side of test block storage unit, the cylinder 6 is released to the test block and is passed through 5 signal connection of signal line with control analysis unit 2, and under control analysis unit 2's control, the push rod that the cylinder 6 was released to the test block is along horizontal direction reciprocating motion to the realization is released forward simultaneously with two test blocks 9 of superpose in the test block storage unit 1 together from the rear side, makes two test blocks 9 align the output along the direction passageway 7 level of 1 front side of test block.
The test piece mechanical clamping jaw 11 and the clamping jaw control cylinder 12 are installed at the front end of the test piece storage unit 1, the clamping jaw control cylinder 12 is horizontally installed, the test piece mechanical clamping jaw 11 is horizontally installed at the end part of a push rod of the clamping jaw control cylinder 12, the test piece mechanical clamping jaw 11 faces the test piece output end of the test piece storage unit 1, the clamping jaw control cylinder 12 is in signal connection with the control analysis unit 2 through a signal line 5, and the clamping jaw control cylinder 12 controls the test piece mechanical clamping jaw 11 to horizontally and linearly move through the push rod under the control of the control analysis unit 2; the test piece mechanical clamping jaw 11 is in signal connection with the control analysis unit 2 through a signal line 5, and the test piece mechanical clamping jaw 11 is clamped or loosened under the control of the control analysis unit 2;
the clamping jaw control cylinder 12 adopts an electric cylinder or a pneumatic cylinder.
CCD camera 3 and two sets ofly install between test block storage unit 1 and clamping jaw control jar 12, and two sets of CCD cameras are followed test block 9 output direction longitudinal symmetry sets up, 9 spot welding processing back of test block hold between lower motion to two CCD cameras 3 at test block mechanical clamping jaw 11's the adding, gather the image information of the test block 9 upper and lower surface form after spot welding respectively through the CCD camera 3 that sets up from top to bottom, two sets of CCD camera 3 passes through signal line 5 signal connection with control analysis unit 2 respectively to the realization is sent the image information who gathers to control analysis unit 2 and is further analytic processing.
A protective baffle 4 is arranged on one side, close to the test piece storage unit 1, of the CCD camera 3 to prevent welding spatter and the like from polluting the CCD camera 3, and isolation protection of the CCD camera 3 is achieved.
A spot welding station is reserved between the CCD camera 3 and the test piece storage unit 1 and is used for spot welding processing of the electrode holder assembly on the test piece 9, and a test piece recovery box is further arranged below the spot welding station.
Besides the signal connection with the test piece sensor 8, the test piece mechanical clamping jaw 11, the clamping jaw control cylinder 12 and the test piece pushing cylinder 6, the control and analysis unit 2 is also in communication connection with a control cabinet of the spot welding robot through a signal line so as to realize the cooperative work with a robot spot welding system comprising a robot control cabinet, the spot welding robot, an electric welding controller, spot welding pliers, spot welding electrode grinding and electrode cap replacing device.
Working process of the device for automatically evaluating the electrode centering state of the resistance spot welding tongs is explained as follows:
1. preparation (not shown):
(a) replacing and polishing a new spot welding electrode or polishing a spot welding electrode by the spot welding robot system;
(b) as shown in fig. 3, the components of the apparatus are all in a work-ready position;
2. as shown in fig. 4, the test piece push-out cylinder 6 pushes out the two stacked test pieces 9 horizontally aligned from the test piece storage unit 1;
3. as shown in fig. 5, the mechanical gripper 11 in the unclamped state moves towards the test piece 9 in the horizontal direction under the control of the gripper control cylinder 12, and is aligned with the output end of the test piece 9;
4. as shown in fig. 6, the mechanical specimen grip 11 grips the specimen 9;
5. as shown in fig. 7, the test piece 9 moves to the spot welding position under the clamping of the mechanical clamping jaw 11, and sends a signal of 'welding preparation completion' to the robot spot welding system;
6. as shown in fig. 8, the electrode holder assembly 1 enters the spot welding station, and the upper and lower spot welding electrodes are aligned with the test piece 9;
7. as shown in fig. 9, a spot welding procedure is started, when the electrode holder controls the upper and lower spot welding electrodes to complete small pressure pressurization (for example, 1kN), the spot welding procedure is suspended, and a "pressurization completed" signal is sent to the control and analysis unit;
8. as shown in fig. 10, the mechanical gripper 11 releases the test piece 9, and at this time, the test piece 9 is held by the upper and lower spot welding electrodes of the electrode holder assembly 13, and at this time, a "test piece released" signal is sent to the robot spot welding system, and then, formal pressurization and electric welding are started, and after welding is finished, a "welding finished" signal is sent to the control and analysis unit while a small-pressure pressurization state is maintained;
9. as shown in fig. 11, the mechanical gripper 11 clamps the electrically welded test piece 7 again, and sends a "test piece clamped" signal to the robot spot welding system;
10. as shown in fig. 12, the upper and lower spot welding electrode loosening test pieces 9 of the electrode holder assembly 13;
11. as shown in fig. 13, the electrode holder assembly 13 is withdrawn and sends a "electrode holder withdrawn" signal to the control and analysis unit;
12. as shown in fig. 14, the electrically welded test piece 9 moves to a position between two sets of CCD cameras 3 under the driving of the mechanical clamping jaw 11 of the test piece, the analysis unit is controlled to control the CCD cameras 3 to respectively collect image information of the upper and lower surfaces of the electrically welded test piece 9, as shown in fig. 17 and 18, and the analysis unit is controlled to analyze and obtain the offset of the upper spot welding test piece 901 and the lower spot welding test piece 902 in the length and width directions of the test piece, and the positions of the upper spot welding indentation 903 on the surface of the upper spot welding test piece 901 and the lower spot welding indentation 904 on the surface of the lower spot welding electrode 902, and send the data result obtained by analysis to the robot spot welding system;
13. as shown in fig. 15, the electrically welded test piece 9 with the image captured is driven by the mechanical clamping jaw 11 of the test piece and sent back to the spot welding station, and the mechanical clamping jaw 11 of the test piece is controlled to be loosened;
14. as shown in fig. 16, the electrically welded test piece 9 having completed the image capturing falls into the test piece collection box below the spot welding station.
And at this point, completing the automatic evaluation of the electrode centering state of the resistance spot welding electrode holder in one period.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. The utility model provides an automatic aassessment resistance spot welding electrode centering state's device which characterized in that:
the device consists of a test piece storage unit, a control analysis unit, a CCD camera, a test piece pushing cylinder, a test piece mechanical clamping jaw and a clamping jaw control cylinder;
the test piece storage unit stores a test piece;
the test piece pushing cylinder is horizontally arranged, the end part of a push rod of the test piece pushing cylinder is right opposite to a test piece pushing port on the rear side of the test piece storage unit, and the test piece is horizontally output from a test piece output port on the front side of the test piece storage unit under the pushing of the test piece pushing cylinder;
the two groups of CCD cameras are arranged on the front side of the test piece storage unit and are arranged symmetrically up and down, and an electric welding station is arranged between the CCD cameras and the test piece storage unit;
the clamping jaw control cylinder is horizontally arranged on the front side of the CCD cameras, the test piece mechanical clamping jaw is arranged at the end part of a push rod of the clamping jaw control cylinder and faces the test piece output port of the test piece storage unit, and the test piece mechanical clamping jaw is driven by the clamping jaw control cylinder to horizontally reciprocate among the test piece output port of the test piece storage unit, the electric welding station and the two groups of CCD cameras;
and the control analysis unit is respectively connected with the CCD camera, the test piece pushing cylinder, the test piece mechanical clamping jaw and the clamping jaw control cylinder through control signals.
2. The apparatus for automatically evaluating the centering state of an electrode of a resistance spot welding holder according to claim 1, wherein:
the test piece storage unit is internally provided with a sliding pressing block, a pressure spring is arranged between the sliding pressing block and the bottom of the test piece storage unit, the test piece is superposed above the sliding pressing block, and the sliding pressing block presses the test piece on a top cover of the test piece storage unit under the elastic force action of the pressure spring.
3. An apparatus for automatically evaluating the centering state of an electrode of a resistance spot welding holder according to claim 1 or 2, wherein:
the test piece storage unit is characterized in that a test piece sensor is mounted on the top cover of the test piece storage unit and used for detecting whether the test piece storage unit has a test piece or not, and the test piece sensor is in signal connection with the control analysis unit.
4. The apparatus for automatically evaluating the centering state of an electrode of a resistance spot welding holder according to claim 1, wherein:
the test piece storage unit is characterized in that a section of horizontal guide channel is arranged at a test piece output port of the test piece storage unit, the height in the channel of the guide channel is the thickness of two test pieces, and the channel width of the guide channel is the width of the test piece.
5. The apparatus for automatically evaluating the centering state of an electrode of a resistance spot welding holder according to claim 1, wherein:
the clamping jaw control cylinder is an electric cylinder or a pneumatic cylinder.
6. The apparatus for automatically evaluating the centering state of an electrode of a resistance spot welding holder according to claim 1, wherein:
and a protective baffle is arranged on one side of the CCD camera adjacent to the spot welding station so as to realize the isolation protection of the CCD camera.
7. The apparatus for automatically evaluating the centering state of an electrode of a resistance spot welding holder according to claim 6, wherein:
and a test piece recovery box is arranged below the spot welding station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021116800.7U CN213379797U (en) | 2020-06-17 | 2020-06-17 | Device for automatically evaluating electrode centering state of resistance spot welding tongs |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021116800.7U CN213379797U (en) | 2020-06-17 | 2020-06-17 | Device for automatically evaluating electrode centering state of resistance spot welding tongs |
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| CN213379797U true CN213379797U (en) | 2021-06-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113770497A (en) * | 2021-06-12 | 2021-12-10 | 中国第一汽车股份有限公司 | Device and method for detecting actual pressurizing position in robot spot welding process |
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2020
- 2020-06-17 CN CN202021116800.7U patent/CN213379797U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113770497A (en) * | 2021-06-12 | 2021-12-10 | 中国第一汽车股份有限公司 | Device and method for detecting actual pressurizing position in robot spot welding process |
| CN113770497B (en) * | 2021-06-12 | 2023-02-10 | 中国第一汽车股份有限公司 | Device and method for detecting actual pressurizing position in robot spot welding process |
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