Real-time stress detection sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a real-time stress detection sensor, which is mounted on a support arm of a resistance welding gun and comprises a shell, a pressing shaft, a piezoelectric ceramic piece and a connector. The left end of the bottom face of the shell protrudes to form a supporting protruding part used for making contact with a resistance welding gun supporting arm, the right end of the bottom face of the shell is provided with a mounting groove used for containing the piezoelectric ceramic piece and the pressing shaft, the pressing shaft and the piezoelectric ceramic piece are both arranged in the mounting groove, and the shell is provided with a mounting hole used for containing the locking bolt. Through the cooperation of the supporting convex part and the pressing shaft, the installation of the piezoelectric ceramic piece can be realized, the preliminary positioning of the pressing shaft during the installation can be completed, the test result can be ensured, the installation of the sensor is convenient and rapid, the assembly efficiency is improved, and through the locking degree and the installation position of the locking bolt in the installation hole, the installation precision is improved. And the detection sensitivity of the piezoelectric ceramic piece is adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field especially is related to a real -time stress detection sensor. BACKGROUND

[0002] The development of industrial technology, especially the development of new energy vehicles, makes higher requirements for the quality of resistance welding. The welding pressure is a key parameter in the resistance welding process, which directly affects the welding quality. The control of welding pressure is much more difficult than the control of welding current and welding time. The commonly used welding pressure monitoring equipment, such as pressure gauge installed on the welding machine pressure cylinder, spring type or oil pressure type special electrode pressure gauge, etc., can usually only measure static pressure. However, in the resistance welding process, the welding pressure is dynamically changing, so these devices cannot accurately reflect the actual pressure situation in the welding process. And it cannot realize the comprehensive 100% detection of all welding points, thereby there is potential safety hazard.

[0003] The size and shape of resistance welding fixture are very different in different application fields, so that the sensor using direct measurement method cannot be installed on some fixtures, and in some small stress change occasions, the sensitivity of the sensor is insufficient, and it cannot monitor the small stress change. SUMMARY

[0004] The technical problem to be solved by the utility model is: in order to overcome the problem that the size and shape of resistance welding fixture are very different in different application fields in the prior art, so that the sensor using direct measurement method cannot be installed on some fixtures, and in some small stress change occasions, the sensitivity of the sensor is insufficient, and it cannot monitor the small stress change. A real-time stress detection sensor is provided.

[0005] The utility model discloses a real-time stress detection sensor, which is installed on a resistance welding gun support arm. The stress detection sensor comprises a shell, a compression shaft, a piezoelectric ceramic sheet and a connector. A support protrusion for contacting the resistance welding gun support arm is formed on the left end of the bottom surface of the shell. An installation slot for accommodating the piezoelectric ceramic sheet and the compression shaft is formed on the right end of the bottom surface of the shell. The compression shaft and the piezoelectric ceramic sheet are arranged in the installation slot. The compression shaft is used for fixing the piezoelectric ceramic sheet. The compression shaft comprises a shaft body, a pressing plate and a contact table. The shaft body and the pressing plate are fixedly connected to the top surface. The piezoelectric ceramic sheet is sleeved on the shaft body. The pressing plate and the shell clamp and fix the piezoelectric ceramic sheet. The bottom surface of the pressing plate is fixedly connected to the contact table. A connecting cavity communicating with the installation slot is formed on the right end surface of the shell. The connector is arranged in the connecting cavity. The piezoelectric ceramic sheet and the connector are electrically connected. An installation hole for accommodating a locking bolt is formed on the shell. The resistance welding gun support arm has a threaded hole matched with the locking bolt. Through the cooperation of the support protrusion and the compression shaft, the piezoelectric ceramic sheet can be installed and the compression shaft can be preliminarily positioned during installation. The test result is ensured. The installation of the sensor is convenient and fast, and the assembly efficiency is improved. The detection sensitivity of the piezoelectric ceramic sheet is adjusted through the locking degree and the installation position of the locking bolt in the installation hole.

[0006] When the compression shaft is embedded in the installation slot and no external force is applied, the bottom surface of the contact table of the compression shaft and the bottom surface of the support protrusion are located in the same plane.

[0007] To solve the problem of how the installation slot and the compression slot cooperate to fix the piezoelectric ceramic sheet, the installation slot further comprises a first accommodating cavity, a second accommodating cavity and a third accommodating cavity which are sequentially communicated. The first accommodating cavity is matched with the pressing plate. The pressing plate is embedded in the first accommodating cavity. The piezoelectric ceramic sheet is arranged in the second accommodating cavity. The third accommodating cavity is matched with the shaft body. The shaft body is arranged in the third accommodating cavity.

[0008] A first step surface for limiting the pressing plate is formed between the first accommodating cavity and the second accommodating cavity. A second step surface for limiting the piezoelectric ceramic sheet is formed between the second accommodating cavity and the third accommodating cavity. The second step surface limits the piezoelectric ceramic sheet.

[0009] To solve the problem of the pressing plate being limited by the first accommodating cavity, the pressing plate further comprises a placing table protruding from the top surface. The placing table is used for contacting the piezoelectric ceramic sheet. The placing table allows the pressing plate to have a moving space in the first accommodating cavity.

[0010] To solve the problem of the shaft body being limited by the third accommodating cavity, the cavity opening of the third accommodating cavity extends to the top surface of the shell.

[0011] In order to solve the problem of inconvenient installation of the connector and the problem of being unable to adjust, the port of the connecting cavity is further arranged with a connecting seat fixedly connected with the shell, and the connecting seat and the connector are threadedly connected.

[0012] In order to solve the problem that the gravity center of the stress detection sensor is offset to one side of the contact table, resulting in unstable test structure, two mounting holes are further arranged on the shell, and the spacing a between one of the mounting holes and the supporting convex part is smaller than the spacing b between the one of the mounting holes and the contact table.

[0013] The stress detection sensor has the advantages that: the stress detection sensor can realize installation of the piezoelectric ceramic sheet and preliminary positioning during installation of the compression shaft, ensures test results, and makes the sensor convenient and fast to install, improves assembly efficiency, and adjusts the detection sensitivity of the piezoelectric ceramic sheet through locking degrees and installation positions of the locking bolts in the mounting holes. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model is further described below in combination with the drawings and embodiments.

[0015] Figure 1 is the three-dimensional structure schematic diagram of the utility model;

[0016] Figure 2 is the sectional structure schematic diagram of the utility model;

[0017] Figure 3 is the structure schematic diagram of the stress detection sensor of the utility model installed on the resistance welding gun support arm.

[0018] In the figure: 1, resistance welding gun support arm, 2, shell, 21, supporting convex part, 22, mounting groove, 221, first containing cavity, 222, second containing cavity, 223, third containing cavity, 224, first step surface, 225, second step surface, 23, connecting cavity, 24, mounting hole, 25, connecting seat, 3, compression shaft, 31, shaft body, 32, pressing plate, 321, placing table, 33, contact table, 4, piezoelectric ceramic sheet, 5, connector. DETAILED DESCRIPTION

[0019] The utility model will be further described in combination with the drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the structures related to the utility model.

[0020] As Figure 1It is the structural schematic drawing of the utility model, a kind of real-time stress detection sensor, which is installed on resistance welding gun support arm 1, and the stress detection sensor includes shell 2, compression shaft 3, piezoelectric ceramic sheet 4 and connector 5, the left end of the bottom surface of shell 2 is protruded and formed with support protruding part 21 for contacting resistance welding gun support arm 1, the stress detection sensor is simple to install, and since it is indirectly measured, the sensor can be directly installed on the welding support arm, and it is not necessary to be installed on the upper and lower ends of the welding gun electrode.

[0021] As shown in Figure 2 The right end of the bottom surface of shell 2 is provided with mounting groove 22 for accommodating piezoelectric ceramic sheet 4 and compression shaft 3, compression shaft 3 and piezoelectric ceramic sheet 4 are arranged in mounting groove 22, compression shaft 3 is used for fixing piezoelectric ceramic sheet 4, compression shaft 3 includes shaft body 31, pressing plate 32 and contact table 33, shaft body 31 and pressing plate 32 are fixedly connected on the top surface, piezoelectric ceramic sheet 4 is sleeved on shaft body 31, pressing plate 32 and shell 2 clamp and fix piezoelectric ceramic sheet 4, the bottom surface of pressing plate 32 is fixedly connected with contact table 33, through the cooperation of support protruding part 21 and compression shaft 3, the installation of piezoelectric ceramic sheet 4 can be realized, and the preliminary positioning during the installation of compression shaft 3 can also be completed, so that the test result is ensured, the installation of the sensor is convenient and fast, and the assembly efficiency is improved.

[0022] When compression shaft 3 is embedded in mounting groove 22 and no external force is applied, the bottom surface of contact table 33 of compression shaft 3 and the bottom surface of support protruding part 21 are located in the same plane.

[0023] Mounting groove 22 includes first accommodating cavity 221, second accommodating cavity 222 and third accommodating cavity 223 which are sequentially communicated, first accommodating cavity 221 is matched with pressing plate 32, pressing plate 32 is embedded in first accommodating cavity 221, piezoelectric ceramic sheet 4 is arranged in second accommodating cavity 222, third accommodating cavity 223 is matched with shaft body 31, and shaft body 31 is arranged in third accommodating cavity 223.

[0024] First step surface 224 for limiting pressing plate 32 is formed between first accommodating cavity 221 and second accommodating cavity 222, second step surface 225 for limiting piezoelectric ceramic sheet 4 is formed between second accommodating cavity 222 and third accommodating cavity 223, and piezoelectric ceramic sheet 4 is limited by second step surface 225.

[0025] The top surface of pressing plate 32 is protruded and formed with placing table 321, placing table 321 is used for contacting piezoelectric ceramic sheet 4, and placing table 321 makes pressing plate 32 have moving space in first accommodating cavity 221.

[0026] The right end surface of the shell 2 is provided with a connecting cavity 23 communicated with the mounting groove 22, the connector 5 is arranged in the connecting cavity 23, and the piezoelectric ceramic sheet 4 and the connector 5 are electrically connected; the port of the connecting cavity 23 is provided with a connecting seat 25 fixedly connected with the shell 2, and the connecting seat 25 and the connector 5 are screw-connected.

[0027] As shown in Figure 2 The shell 2 is provided with a mounting hole 24 for accommodating a locking bolt, and the electric resistance welding gun arm 1 is provided with a threaded hole matched with the locking bolt. The detection sensitivity of the piezoelectric ceramic sheet is adjusted by the locking degree and the mounting position of the locking bolt in the mounting hole 24.

[0028] The shell 2 is provided with two mounting holes 24, and the spacing a between one of the mounting holes 24 and the supporting convex part 21 is smaller than the spacing b between the mounting hole 24 and the contact table 33. The different positions of the mounting holes 24 make the gravity centers of the locking bolts fixed in different positions, so that the contact degree of the pressing shaft 3 and the electric resistance welding gun arm 1 is controlled, and the detection sensitivity is controlled.

[0029] In the application, the mounting hole 24 can be one, two or more than two, and the number of the mounting hole 24 is not limited in the application.

[0030] Based on the above ideal embodiments of the application, the related personnel can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited by the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A real-time stress detection sensor, which is installed on a resistance welding gun boom (1), characterized in that, The stress detection sensor comprises a shell (2), a compression shaft (3), a piezoelectric ceramic sheet (4) and a connector (5), a support protrusion (21) is protruded at the left end of the bottom surface of the shell (2) and is used for contacting the electric resistance welding gun support arm (1), an installation slot (22) is formed at the right end of the bottom surface of the shell (2) and is used for accommodating the piezoelectric ceramic sheet (4) and the compression shaft (3), the compression shaft (3) and the piezoelectric ceramic sheet (4) are arranged in the installation slot (22), the compression shaft (3) is used for fixing the piezoelectric ceramic sheet (4), the compression shaft (3) comprises a shaft body (31), a pressing plate (32) and a contact table (33), the top surface of the shaft body (31) and the pressing plate (32) are fixedly connected, the piezoelectric ceramic sheet (4) is sleeved on the shaft body (31), the pressing plate (32) and the shell (2) clamp and fix the piezoelectric ceramic sheet (4), the bottom surface of the pressing plate (32) is fixedly connected with the contact table (33), a connecting cavity (23) is formed at the right end surface of the shell (2) and is communicated with the installation slot (22), the connector (5) is arranged in the connecting cavity (23), the piezoelectric ceramic sheet (4) and the connector (5) are electrically connected, an installation hole (24) is formed in the shell (2) and is used for accommodating a locking bolt, the electric resistance welding gun support arm (1) has a threaded hole matched with the locking bolt; When the compression shaft (3) is embedded in the installation slot (22) and no external force is applied, the bottom surface of the contact table (33) of the compression shaft (3) and the bottom surface of the support protrusion (21) are located in the same plane.

2. A real-time stress detection sensor as claimed in claim 1, characterized in that: The installation slot (22) comprises a first accommodating cavity (221), a second accommodating cavity (222) and a third accommodating cavity (223) which are communicated in sequence, the first accommodating cavity (221) is matched with the pressing plate (32), the pressing plate (32) is embedded in the first accommodating cavity (221), the piezoelectric ceramic sheet (4) is arranged in the second accommodating cavity (222), the third accommodating cavity (223) is matched with the shaft body (31), and the shaft body (31) is arranged in the third accommodating cavity (223). A first step surface (224) is formed between the first accommodating cavity (221) and the second accommodating cavity (222) and is used for limiting the pressing plate (32), a second step surface (225) is formed between the second accommodating cavity (222) and the third accommodating cavity (223) and is used for limiting the piezoelectric ceramic sheet (4), and the second step surface (225) limits the piezoelectric ceramic sheet (4).

3. A real-time stress detection sensor as claimed in claim 2, characterized in that: A placement table (321) is protruded at the top surface of the pressing plate (32) and is used for contacting the piezoelectric ceramic sheet (4), and the placement table (321) enables the pressing plate (32) to have a moving space in the first accommodating cavity (221).

4. A real-time stress detection sensor as claimed in claim 2, wherein: The cavity opening of the third accommodating cavity (223) extends to the top surface of the shell (2).

5. A real-time stress detection sensor as claimed in claim 1, wherein: A connecting seat (25) fixedly connected with the shell (2) is arranged at the port of the connecting cavity (23), and the connecting seat (25) is threadedly connected with the connector (5).

6. A real-time stress detection sensor as claimed in claim 1, wherein: Two mounting holes (24) are formed on the shell (2), and the spacing a between one of the mounting holes (24) and the supporting convex part (21) is smaller than the spacing b between the mounting hole (24) and the contact platform (33).

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