Welding mistake proofing device for projection welding nut

Abstract

The utility model discloses a welding mistake proofing device for a projection welding nut. The welding mistake proofing device comprises a case, a shell, a positioning pin, a nut and a welding table, wherein the nut is connected to the positioning pin in a sleeved mode. A resistance type potentiometer, a connecting block, an air cylinder, a pressing block and a connecting rod connected with the air cylinder are arranged in the machine box. The positioning pin is connected with the connecting rod, the pressing block is located at the top of the air cylinder, the connecting rod penetrates through the pressing block, the pressing block can move along with the connecting rod, the connecting block is connected with the pressing block, the connecting block is connected with a sliding system of the resistance type potentiometer, an upper electrode is arranged on the outer side of the welding table, and the upper electrode is connected with the upper electrode. The upper electrode can press the positioning pin and the nut downwards at the same time. Therefore, the distances between the bottoms of the nuts in different states and the lower shell are consistent, so that the detection is more accurate. Therefore, the device is not affected by a magnetic field or an external magnetic field in the working process, and the detection accuracy of the position of the nut is further ensured.

Description

Technical Field

[0001] The utility model relates to the field of nut resistance welding, in particular to a projection welding nut welding error prevention device. Background Art

[0002] Projection welding is a commonly used metal connection technology. By fixing the projection welding nut on the surface of the workpiece, a strong connection and high load-bearing capacity are achieved. Due to its many advantages such as high efficiency and high load-bearing capacity, it is suitable for welding various metal materials.

[0003] The prior art CN116900589A discloses a locating pin device and method for switching multiple varieties of nuts. The lower electrode locating pin device is designed as a two-cylinder structure, in which the main cylinder is responsible for the extension and retraction of the locating pin, and the extension and retraction of the auxiliary cylinder controls the extension height of the locating pin, thereby achieving the height difference of the positioning of different nuts.

[0004] However, the above prior art has the following problems:

[0005] 1. During operation, the lower electrode positioning device is easily affected by the magnetic field or external magnetic field, resulting in inaccurate positioning detection and damage to parts.

[0006] 2. The prior art can only position nuts of different types, but cannot detect the status of the nuts on the positioning pins in time, which may lead to inaccurate detection.

[0007] Therefore, there is an urgent need for a projection welding nut welding error prevention device to solve the problems existing in the prior art. Summary of the invention

[0008] The utility model overcomes the shortcomings of the prior art and provides a projection welding nut welding error prevention device. To achieve the above purpose, the utility model adopts a technical solution: a projection welding nut welding error prevention device, comprising: a chassis, a shell, a positioning pin, a nut sleeved at the positioning pin, and a welding table.

[0009] The chassis includes: a resistive potentiometer, a connecting block, a cylinder, a pressure block, and a connecting rod connected to the cylinder; the positioning pin is connected to the connecting rod, the pressure block is located at the top of the cylinder, the connecting rod passes through the pressure block, the pressure block can move following the connecting rod, the connecting block is connected to the pressure block, and the connecting block is connected to the sliding system of the resistive potentiometer.

[0010] An upper electrode is arranged on the outer side of the welding table, and the upper electrode can press down the positioning pin and the nut simultaneously, and the pressing block and the connecting block can transmit the displacement distance of the positioning pin and the nut to the resistive potentiometer.

[0011] In a preferred embodiment of the present invention, the cross section of the positioning pin is conical.

[0012] In a preferred embodiment of the utility model, the connecting rod and the positioning pin are connected via a connecting rod, and the connecting rod is located on the inner side of the shell.

[0013] In a preferred embodiment of the utility model, the welding platform is provided with a groove, and the end of the positioning pin can be embedded in the groove.

[0014] In a preferred embodiment of the present invention, the diameter of the end of the positioning pin is 3-5 mm.

[0015] In a preferred embodiment of the present invention, the diameter of the bottom of the positioning pin is 4 to 10 mm.

[0016] In a preferred embodiment of the present invention, the working current of the upper electrode is 100-1000A.

[0017] In a preferred embodiment of the utility model, the positioning pin is provided with a displacement reference plane reference position connected to the resistive potentiometer signal and a correct displacement position reference plane.

[0018] In a preferred embodiment of the present invention, the reference position of the displacement reference plane coincides with the top of the housing.

[0019] In a preferred embodiment of the present invention, the correct displacement position reference plane coincides with the bottom of the nut, and the correct displacement position reference plane is located above the reference position of the displacement reference plane.

[0020] In a preferred embodiment of the utility model, a method for determining a projection welding nut welding error prevention device comprises the following steps:

[0021] S, the lower electrode presses down the positioning pin and nut;

[0022] S, the sliding system of the resistive potentiometer then descends and detects the overlapping position of the bottom of the nut and the reference position of the displacement reference surface;

[0023] S. When the bottom of the nut completely coincides with the reference position of the displacement reference surface, it is in the correct state. Otherwise, it is in the wrong state and an error signal is issued.

[0024] In a preferred embodiment of the utility model, the error state includes: the position of the nut is wrong, the bottom of the nut is higher than the reference position of the displacement reference plane, and the bottom of the nut is lower than the reference position of the displacement reference plane.

[0025] The utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0026] (1) The present application is provided with an upper electrode and a resistive potentiometer. When in use, the upper electrode can apply pressure to the nut and the positioning pin, thereby changing the position of the nut and the positioning pin, so that the distance between the bottom of the nut and the lower shell in different states is consistent, thereby ensuring more accurate detection; the resistive potentiometer is used as a detection element, and its working principle is based on the voltage division principle of resistance. In addition, its output signal is also obtained through the change of resistance value, so that it can be unaffected by the magnetic field or external magnetic field during operation, thereby further ensuring the accuracy of nut position detection. This solves the problem of inaccurate detection and susceptibility to magnetic field interference of the positioning device in the prior art.

[0027] (2) The present application is provided with a pressure block, a connecting block, and a connecting rod. When in use, the connecting rod moves under the action of the cylinder, prompting the pressure block to drive the connecting block to move accordingly, so that the movement of the positioning pin can be simply and effectively transmitted to the resistive potentiometer, so that the judgment information source of the resistive potentiometer is more timely and accurate, thereby effectively avoiding the situation where the welding machine is powered on due to wrong judgment, causing the nut parts to be damaged and scrapped. This solves the problem of nut parts being damaged due to inaccurate detection in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0029] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0030] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0031] Figure 3 It is a side view structural schematic diagram of the overall structure of the utility model;

[0032] Figure 4 It is a structural schematic diagram of the utility model when the nut position detection is in a correct state;

[0033] Figure 5 This is a structural schematic diagram of the utility model when the nut is placed in the wrong position;

[0034] Figure 6 It is a structural schematic diagram when the bottom of the nut of the utility model is higher than the reference position of the displacement reference surface;

[0035] Figure 7 It is a structural schematic diagram when the bottom of the nut of the utility model is lower than the reference position of the displacement reference surface.

[0036] In the figure: 1. chassis; 2. resistive potentiometer; 3. connecting block; 4. cylinder; 5. pressure block; 6. connecting rod; 7. outer shell; 8. upper electrode; 9. positioning pin; 10. nut; 11. connecting rod; 12. welding table. DETAILED DESCRIPTION

[0037] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0038] like Figure 1 As shown, a projection welding nut welding error prevention device includes: a chassis 1, a shell 7, a positioning pin 9, a nut 10 sleeved on the positioning pin 9, and a welding table 12.

[0039] The chassis 1 includes: a resistive potentiometer 2, a connecting block 3, a cylinder 4, a pressure block 5, and a connecting rod 6 connected to the cylinder 4; a positioning pin 9 is connected to the connecting rod 6, the pressure block 5 is located at the top of the cylinder 4, the connecting rod 6 passes through the pressure block 5, the pressure block 5 can move following the connecting rod 6, the connecting block 3 is connected to the pressure block 5, and the connecting block 3 is connected to the sliding system of the resistive potentiometer 2.

[0040] In one embodiment, the resistive potentiometer 2 can be one of RM060-V1, a plug-in potentiometer, a surface mount potentiometer, a miniature potentiometer, and a multi-turn potentiometer.

[0041] In one embodiment, the cylinder 4 may be one of a 160 cylinder, a 320 cylinder, and a diamond cylinder.

[0042] An upper electrode 8 is arranged on the outside of the welding table 12. The working current of the upper electrode 8 is 100-1000A. The upper electrode 8 can press down the positioning pin 9 and the nut 10 at the same time. The pressing block 5 and the connecting block 3 can transmit the displacement distance of the positioning pin 9 and the nut 10 to the resistive potentiometer 2.

[0043] like Figure 2 and Figure 3 As shown, the cross section of the locating pin 9 is conical, the connecting rod 6 and the locating pin 9 are connected by a connecting rod 11, the connecting rod 11 is located on the inner side of the outer shell 7, and a groove is provided at the welding platform 12, and the end of the locating pin 9 can be embedded in the groove. The diameter of the end of the locating pin 9 is 3 to 5 mm, and the diameter of the bottom of the locating pin 9 is 4 to 10 mm.

[0044] like Figure 4As shown, a displacement reference plane reference position and a correct displacement position reference plane connected to the signal of the resistive potentiometer 2 are provided at the positioning pin 9. The displacement reference plane reference position coincides with the top of the housing 7. The correct displacement position reference plane coincides with the bottom of the nut 10, and the correct displacement position reference plane is located above the displacement reference plane reference position.

[0045] like Figure 4 As shown, a method for determining a projection welding nut welding error prevention device comprises the following steps:

[0046] S1. The lower electrode 8 presses the positioning pin 9 and the nut 10 downward.

[0047] S2, the sliding system of the resistive potentiometer 2 then descends, and detects the overlapping position of the bottom of the nut 10 and the reference position of the displacement reference surface.

[0048] S3. If the bottom of the nut 10 completely coincides with the reference position of the displacement reference surface, it is a correct state. Otherwise, it is an error state and an error signal is issued.

[0049] like Figure 5 As shown, the position of the nut 10 is wrong. That is, the nut 10 is placed on the top of the housing 7 and is not sleeved on the positioning pin 9.

[0050] like Figure 6 As shown in FIG. 1 , the bottom of the nut 10 is higher than the reference position of the displacement reference surface, that is, the portion of the positioning pin 9 extending out of the housing 7 is too much.

[0051] like Figure 7 As shown, the bottom of the nut 10 is lower than the reference position of the displacement reference surface, that is, the portion of the positioning pin 9 extending out of the housing 7 is too small.

[0052] When the utility model is used, the cylinder 4 pushes out the locating pin 9 with the nut 10; the upper electrode 8 presses down the locating pin 9 and the nut 10 at the same time, and the displacement of the locating pin 9 causes the connecting rod 11 and the connecting rod 6 to move downward. Since the pressing block 5 can move with the displacement of the connecting rod 6, the pressing block 5 and the connecting block 3 are all moved downward. The connecting block 3 is connected to the sliding system of the resistive potentiometer 2. Therefore, the displacement distance between the locating pin 9 and the nut 10 is transmitted to the resistive potentiometer 2, and the value of the resistive potentiometer 2 is used to determine whether the position of the nut 10 is accurate.

[0053] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A projection welding nut welding error prevention device, comprising: A chassis (1), a housing (7), a positioning pin (9), a nut (10) sleeved on the positioning pin (9), and a welding platform (12); characterized in that: The chassis (1) comprises: a resistive potentiometer (2), a connecting block (3), a cylinder (4), a pressure block (5), and a connecting rod (6) connected to the cylinder (4); the positioning pin (9) is connected to the connecting rod (6); the pressure block (5) is located at the top of the cylinder (4); the connecting rod (6) passes through the pressure block (5); the pressure block (5) can move following the connecting rod (6); the connecting block (3) is connected to the pressure block (5); and the connecting block (3) is connected to the sliding system of the resistive potentiometer (2); An upper electrode (8) is arranged on the outer side of the welding platform (12), and the upper electrode (8) can press the positioning pin (9) and the nut (10) downward at the same time, and the pressing block (5) and the connecting block (3) can transmit the displacement distance of the positioning pin (9) and the nut (10) to the resistive potentiometer (2).

2. The projection welding nut welding error prevention device according to claim 1, characterized in that: The cross section of the positioning pin (9) is conical.

3. The projection welding nut welding error prevention device according to claim 1, characterized in that: The connecting rod (6) and the positioning pin (9) are connected via a connecting rod (11), and the connecting rod (11) is located on the inner side of the outer shell (7).

4. The projection welding nut welding error prevention device according to claim 1, characterized in that: The welding platform (12) is provided with a groove, and the end of the positioning pin (9) can be embedded in the groove.

5. The projection welding nut welding error prevention device according to claim 1, characterized in that: The diameter of the end of the positioning pin (9) is 3 to 5 mm.

6. The projection welding nut welding error prevention device according to claim 1, characterized in that: The bottom of the positioning pin (9) has a diameter of 4 to 10 mm.

7. The projection welding nut welding error prevention device according to claim 1, characterized in that: The working current of the upper electrode (8) is 100-1000A.

8. The projection welding nut welding error prevention device according to claim 1, characterized in that: The positioning pin (9) is provided with a displacement reference plane reference position connected to the signal of the resistive potentiometer (2) and a correct displacement position reference plane.

9. The projection welding nut welding error prevention device according to claim 8, characterized in that: The displacement reference plane reference position coincides with the top of the housing (7).

10. The projection welding nut welding error prevention device according to claim 8, characterized in that: The correct displacement position reference surface coincides with the bottom of the nut (10), and the correct displacement position reference surface is located above the reference position of the displacement reference surface.

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