Fool-proof device for nut welding

Abstract

The utility model relates to the technical field of fool-proof devices, in particular to a fool-proof device for nut welding, which comprises a connecting block, a proximity switch and a movable pin, the bottom of the connecting block is fixedly connected with the proximity switch, and the movable pin vertically penetrates through the top of the connecting block; the device further comprises a spring sleeve, a tail rod, a reset spring and a nut, one end of the spring sleeve is fixed to the bottom of the connecting block and is concentric with the movable pin, and the other end of the spring sleeve is closed. One end of the tail rod is fixedly connected with the lower end of the movable pin, the other end of the tail rod vertically penetrates through the spring sleeve, and the end, penetrating out of the spring sleeve, of the tail rod is in threaded connection with the nut. The built-in design of the reset spring is achieved, so that the reset spring is not prone to being stuck by welding slag and can stretch out and draw back normally, and then the proximity switch is not prone to misjudgment.

Description

Technical Field

[0001] The utility model relates to the technical field of fool-proofing devices, in particular to a fool-proofing device for nut welding. Background Art

[0002] In the automotive manufacturing industry, in order to meet the requirements of automobile panel assembly and fixation, it is usually necessary to pre-weld nuts at specific positions on the automobile panels. In order to prevent the nuts from being missed or incorrectly welded during the welding process, it is necessary to install an anti-fouling device on the welding fixture.

[0003] The utility model with the publication (announcement) number CN204094380U discloses a nut welding induction anti-mistake device, including a connecting block, a movable pin, a proximity switch, and a reset spring. The connecting block is provided with a through hole I and a through hole II. The movable pin is movably engaged with the through hole I, and the proximity switch is engaged with the through hole II. The lower end of the movable pin is provided with a positioning block with a diameter larger than the diameter of the through hole I. The positioning block is close to the proximity switch. The movable pin is provided with a limit block. The reset spring is sleeved on the outside of the movable pin and is located between the limit block and the connecting block.

[0004] As in the above-mentioned technical solution, the reset spring is exposed. During the actual welding operation, welding slag is more likely to fall into the pitch of the reset spring, affecting its normal expansion and contraction, or even getting stuck, thereby causing the proximity switch to misjudge. Utility Model Content

[0005] In view of this, the utility model proposes an anti-mistake device for nut welding, which realizes a built-in design of the reset spring by arranging the reset spring at the bottom of the connecting block and in the spring sleeve, so that the reset spring is not easily stuck by welding slag and can expand and contract normally, thereby making it less likely for the proximity switch to make misjudgments.

[0006] The technical solution of the present utility model is achieved as follows:

[0007] The utility model provides a foolproof device for nut welding, comprising a connecting block, a proximity switch and a movable pin, wherein:

[0008] The bottom of the connecting block is fixedly connected to the proximity switch, and the top of the connecting block is vertically penetrated by the movable pin;

[0009] It also includes a spring sleeve, a tail rod, a return spring and a nut, wherein:

[0010] One end of the spring sleeve is fixed to the bottom of the connecting block and is concentric with the movable pin, and the other end is closed;

[0011] One end of the tail rod is fixedly connected to the lower end of the movable pin, and the other end vertically passes through the spring sleeve. The nut is screwed on the end of the tail rod passing through the spring sleeve, and the nut is used to selectively block the sensing end of the proximity switch;

[0012] The return spring is arranged in the spring sleeve, the tail rod passes through the return spring, and the upper end of the return spring elastically abuts against the lower end of the movable pin.

[0013] On the basis of the above technical solution, preferably, it further includes a linear bearing, wherein,

[0014] A through hole is vertically provided on the connecting block, and the linear bearing is embedded in the through hole;

[0015] The movable pin vertically penetrates the linear bearing and is slidably connected.

[0016] On the basis of the above technical solution, preferably, an accommodating cavity is reserved between the top end of the linear bearing and the top end of the through hole, and a limiting flange is provided on the side of the upper end of the movable pin, wherein,

[0017] The lower end of the limiting flange is slidably arranged in the accommodating cavity, and the vertical depth of the accommodating cavity is greater than the vertical thickness of the limiting flange.

[0018] On the basis of the above technical solution, preferably, the top end of the movable pin is in the shape of a bullet head.

[0019] On the basis of the above technical solution, preferably, two nuts are screwed onto the lower end of the tail rod, and the two nuts abut against each other.

[0020] On the basis of the above technical solution, preferably, it further includes a bracket and a sensor sleeve, wherein,

[0021] One end of the bracket is fixedly connected to the connecting block, and the other end is fixedly connected to the sensor sleeve;

[0022] The sensor sleeve is arranged horizontally, and the sensing end of the proximity switch is arranged in the sensor sleeve and fixedly connected.

[0023] On the basis of the above technical solution, preferably, it further includes a fixing pin, wherein,

[0024] The fixed pin is fixed on the top of the connecting block and is located on one side of the movable pin.

[0025] On the basis of the above technical solution, preferably, it further includes positioning holes, wherein,

[0026] A plurality of positioning holes are vertically arranged on the top of the connecting block.

[0027] On the basis of the above technical solution, preferably, the upper end opening of the positioning hole is a bell mouth.

[0028] On the basis of the above technical solution, preferably, it further includes a lifting cylinder, wherein,

[0029] The output end of the lifting cylinder is fixedly connected to the connecting block.

[0030] The foolproof device for nut welding of the utility model has the following beneficial effects compared with the prior art:

[0031] (1) By arranging the reset spring at the bottom of the connecting block and arranging the reset spring in the spring sleeve, a built-in design of the reset spring is achieved, so that the reset spring is not easily stuck by welding slag and can be normally extended and retracted, thereby making it less likely for the proximity switch to misjudge.

[0032] (2) By providing a receiving groove, it is convenient to accommodate the limiting flange into the receiving cavity, and then support the workpiece through the connecting block, reducing the load on the movable pin, making the movable pin less likely to be damaged.

[0033] (3) By setting up a linear bearing, the smoothness of the movable pin when sliding up and down is improved.

[0034] (4) Two nuts are screwed onto the lower end of the tail rod, and the two nuts abut against each other, so that the nuts are not easy to loosen, which is conducive to maintaining the use height of the limiting flange.

[0035] (5) By arranging the sensing end of the proximity switch in the sensor sleeve and fixing it, it is beneficial to protect the sensing end of the proximity switch and improve its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a three-dimensional diagram of a fool-proof device for nut welding according to the present invention;

[0038] Figure 2 A three-dimensional diagram of a fool-proof device for nut welding according to the present invention from another perspective;

[0039] Figure 3 It is a partial top view of the utility model;

[0040] Figure 4 It is a cross-sectional view taken along the line AA of the present invention;

[0041] In the figure: 1. Connecting block; 2. Proximity switch; 3. Movable pin; 4. Spring sleeve; 5. Tail rod; 6. Return spring; 7. Nut; 8. Linear bearing; 9. Bracket; 10. Sensor sleeve; 11. Fixing pin; 12. Positioning hole; 13. Lifting cylinder; 101. Through hole; 102. Accommodating chamber; 301. Limiting flange. DETAILED DESCRIPTION

[0042] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] like Figure 1-4 As shown, the utility model is a foolproof device for nut welding, which includes a connecting block 1, a proximity switch 2, a movable pin 3, a spring sleeve 4, a tail rod 5, a reset spring 6, a nut 7, a bracket 9 and a sensor sleeve 10.

[0044] Among them, the top of the connecting block 1 is used to support the nut to be welded, the bottom of the connecting block 1 is fixedly connected to the proximity switch 2, and a movable pin 3 is vertically penetrated through the top of the connecting block 1. The proximity switch 2 is used to detect whether there is a nut on the top of the connecting block 1, and the top of the movable pin 3 is in the shape of a bullet head.

[0045] One end of the spring sleeve 4 is fixed to the bottom of the connecting block 1 and is concentric with the movable pin 3, and the other end is closed; one end of the tail rod 5 is fixedly connected to the lower end of the movable pin 3, and the other end vertically passes through the spring sleeve 4. The tail rod 5 passes through the spring sleeve 4 and is screwed on one end of the nut 7, which is used to selectively block the sensing end of the proximity switch 2; the reset spring 6 is arranged in the spring sleeve 4, and the tail rod 5 passes through the reset spring 6, and the upper end of the reset spring 6 elastic force resists the lower end of the movable pin 3; wherein, the reset spring 6 is used to reset the tail rod 5 and the movable pin 3.

[0046] When there is a nut on the top of the connecting block 1, the nut presses down the movable pin 3, and the movable pin 3 pushes the tail rod 5 to slide downward and compresses the reset spring 6. During the process, the nut 7 moves to the sensing end of the proximity switch 2 to block the sensing end. At this time, the proximity switch 2 has a signal, indicating that there is a nut on the top of the connecting block 1. After welding, the nut is removed, and the reset spring 6 rebounds, driving the tail rod 5 and the movable pin 3 to return to their original position. After returning, there is no obstruction at the sensing end of the proximity switch 2. At this time, the proximity switch 2 has no signal, indicating that there is no nut on the top of the connecting block 1. The specific detection principle can be known in the prior art, such as a nut welding induction anti-fool device disclosed in CN204094380U.

[0047] Compared with the above structure, in the existing devices (such as the nut welding induction fool-proofing device disclosed in CN204094380U), the reset spring is external, so the welding slag is very easy to get stuck in the pitch of the spring. When a nut or workpiece is placed on the device, the spring's expansion and contraction length will be abnormal due to the influence of the welding slag. Even when the welding is too stuck, the spring will be stuck and unable to expand and contract. This will cause the movable pin to move downward for an insufficient length or be unable to move downward, thereby causing the movable pin to be unable to normally block its proximity switch. At this time, the proximity switch has no signal, and it is judged that there is no nut on the tooling, resulting in a misjudgment. In the fool-proofing device for nut welding of the present application, since the reset spring 6 is built-in, the reset spring 6 is not easily stuck by the welding slag and can expand and contract normally. During the welding process, the welding slag is not easily stuck in the pitch of the reset spring 6, so the proximity switch 2 is not prone to misjudgment.

[0048] In order to improve the sliding smoothness of the movable pin 3, the anti-fool device for nut welding also includes a linear bearing 8, wherein, as Figure 4 As shown, the linear bearing 8 is a cylindrical structure with a circular cross-section. Its inner cylindrical surface is smooth and its hardness is greater than or equal to the hardness of the movable pin 3. When in use, a through hole 101 is vertically provided on the connecting block 1, the linear bearing 8 is embedded in the through hole 101, and then the movable pin 3 is vertically passed through the linear bearing 8. After passing through, the movable pin 3 can slide up and down in the linear bearing 8.

[0049] In the existing nut welding induction anti-mistake device, such as the nut welding induction anti-mistake device disclosed in CN204094380U, its movable pin is used to position the nut hole, and a flange-shaped limit block is provided on the upper end of the movable pin. The top surface of the limit block is used to support the nut and the plate to be welded. In this structure, the movable pin bears most of the weight of the nut and the plate to be welded, and therefore, the movable pin is easily damaged.

[0050] In order to solve the problem that the movable pin of the existing nut welding induction fool-proof device is easily damaged, the utility model sets a movable pin 3 to locate the hole position of the nut, and sets a connecting block 1 to support the nut and the workpiece to be welded, so that the movable pin 3 is not easily damaged; specifically, Figure 4 As shown, an accommodating cavity 102 is reserved between the top of the linear bearing 8 and the top of the through hole 101, and a limiting flange 301 is provided on the side of the upper end of the movable pin 3, wherein the lower end of the limiting flange 301 is slidably provided in the accommodating cavity 102, and the vertical depth of the accommodating cavity 102 is greater than the vertical thickness of the limiting flange 301. Figure 4 In the embodiment, the vertical depth of the accommodating cavity 102 is twice the vertical thickness of the limiting flange 301 .

[0051] When the limiting flange 301 is loaded, it falls into the accommodating cavity 102, and then the top surface of the connecting block 1 supports the nut and the workpiece. After welding, the nut and the workpiece are disassembled, and the top of the limiting flange 301 is moved out of the accommodating cavity 102 again. In the initial state, Figure 4 As shown, the lower end of the limiting flange 301 is located inside the accommodating cavity 102 , and is used to block the top opening of the accommodating cavity 102 , so that welding slag is not easy to enter the accommodating cavity 102 , which is conducive to the smooth sliding of the limiting flange 301 .

[0052] In order to maintain the height of the limiting flange 301 in the initial state, as Figure 4 As shown, there are two nuts 7 screwed on the lower end of the tail rod 5, and the two nuts 7 abut against each other. The mutual abutment of the two nuts 7 makes it difficult for the nuts 7 to loosen, which is conducive to maintaining the relative position of the nuts 7 and the tail rod 5, and further maintaining the use height of the limiting flange 301.

[0053] The bracket 9 is used to install the sensor sleeve 10. Figure 4 As shown, the bracket 9 is an L-shaped plate, one end of which is fixedly connected to the side end of the connecting block 1, and the other end is fixedly connected to the side of the sensor sleeve 10; the sensor sleeve 10 is arranged horizontally, and the sensing end of the proximity switch 2 is arranged in the sensor sleeve 10 and fixedly connected.

[0054] like Figure 4 As shown, the sensing end of the proximity switch 2 is sleeved inside the sensor sleeve 10. After sleeved, screws are screwed on the side of the sensor sleeve 10, and the screws are used to support the side of the proximity switch 2 to realize the proximity switch 2. In this structure, the sensing end of the proximity switch 2 is inside the sensor sleeve 10, which is convenient for protecting the proximity switch 2 through the sensor sleeve 10 and improving the service life of the proximity switch 2.

[0055] In addition, the above-mentioned fool-proofing device for nut welding also includes a fixing pin 11 and a positioning hole 12, wherein the fixing pin 11 is fixed on the top of the connecting block 1 and is located on one side of the movable pin 3, and there are several positioning holes 12 arranged vertically on the top of the connecting block 1.

[0056] In actual welding, positioning protrusions and positioning holes will be set on the plate for installation and positioning of the plate and the anti-foolproofing device. After installing the nut, the positioning protrusion of the plate is plugged into the positioning hole 12 for positioning, and the positioning hole on the plate is plugged into the fixing pin 11 for positioning.

[0057] To facilitate positioning, the upper end of the positioning hole 12 is a bell mouth, and the upper end of the fixing pin 11 is in the shape of a bullet head.

[0058] In addition, in actual welding, the positioning height needs to be changed. For this purpose, the above-mentioned fool-proofing device for nut welding also includes a lifting cylinder 13, wherein the connecting block 1 is fixed on the output end of the lifting cylinder 13, and the height of the connecting block 1 is changed by the lifting cylinder 13, thereby realizing the change of the positioning height.

[0059] The method of using the fool-proof device for nut welding of the utility model is as follows:

[0060] Fix the lifting cylinder 13 on the welding platform and fix the connecting block 1 on the output end of the lifting cylinder 13. After a nut is placed on the top of the connecting block 1, the nut presses down the limit flange 301, so that the limit flange 301 sinks into the accommodating cavity 102. At the same time, the movable pin 3 and the tail rod 5 move downward, and the nut 7 moves downward to the sensing end of the proximity switch 2. At this time, the reset spring 6 is compressed. When the nut is removed, the reset spring 6 rebounds, driving the movable pin 3, the tail rod 5, and the nut 7 to return to their original positions.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A foolproof device for nut welding, comprising a connecting block (1), a proximity switch (2) and a movable pin (3), wherein: The bottom of the connecting block (1) is fixedly connected to the proximity switch (2), and the top of the connecting block (1) is provided with the movable pin (3) penetrating vertically; It is characterized in that it also includes a spring sleeve (4), a tail rod (5), a return spring (6) and a nut (7), wherein: One end of the spring sleeve (4) is fixed to the bottom of the connecting block (1) and is concentric with the movable pin (3), and the other end is closed; One end of the tail rod (5) is fixedly connected to the lower end of the movable pin (3), and the other end vertically passes through the spring sleeve (4). The nut (7) is screwed on one end of the tail rod (5) passing through the spring sleeve (4), and the nut (7) is used to selectively block the sensing end of the proximity switch (2); The return spring (6) is arranged in the spring sleeve (4), the tail rod (5) passes through the return spring (6), and the elastic force of the upper end of the return spring (6) presses against the lower end of the movable pin (3).

2. A foolproof device for nut welding according to claim 1, characterized in that: Also included is a linear bearing (8), wherein: A through hole (101) is vertically provided on the connecting block (1), and the linear bearing (8) is embedded in the through hole (101); The movable pin (3) vertically penetrates the linear bearing (8) and is slidably connected.

3. A foolproof device for nut welding according to claim 2, characterized in that: An accommodating cavity (102) is reserved between the top end of the linear bearing (8) and the top end of the through hole (101), and a limiting flange (301) is provided on the side of the upper end of the movable pin (3), wherein: The lower end of the limiting flange (301) is slidably arranged in the accommodating cavity (102), and the vertical depth of the accommodating cavity (102) is greater than the vertical thickness of the limiting flange (301).

4. A foolproof device for nut welding according to claim 3, characterized in that: The top end of the movable pin (3) is in the shape of a bullet head.

5. The foolproof device for nut welding according to claim 1, characterized in that: Two nuts (7) are screwed onto the lower end of the tail rod (5), and the two nuts (7) are mutually supported.

6. The foolproof device for nut welding according to claim 1, characterized in that: It also includes a bracket (9) and a sensor sleeve (10), wherein: One end of the bracket (9) is fixedly connected to the connecting block (1), and the other end is fixedly connected to the sensor sleeve (10); The sensor sleeve (10) is arranged horizontally, and the sensing end of the proximity switch (2) is arranged in the sensor sleeve (10) and fixedly connected.

7. The foolproof device for nut welding according to claim 1, characterized in that: Also included is a fixing pin (11), wherein The fixed pin (11) is fixed on the top of the connecting block (1) and is located on one side of the movable pin (3).

8. The foolproof device for nut welding according to claim 7, characterized in that: Also included is a positioning hole (12), wherein A plurality of positioning holes (12) are vertically arranged on the top of the connecting block (1).

9. A foolproof device for nut welding according to claim 8, characterized in that: The upper end opening of the positioning hole (12) is a bell mouth.

10. The foolproof device for nut welding according to claim 1, characterized in that: It also includes a lifting cylinder (13), wherein The output end of the lifting cylinder (13) is fixedly connected to the connecting block (1).

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