Nut detection device

Abstract

The utility model relates to the field of component detection, in particular to a nut detection device, which comprises a connecting block, a positioning pin and a proximity switch are arranged in the connecting block, a compression spring is sleeved on the upper section of the positioning pin, and the mounting position of the proximity switch is perpendicular to that of the positioning pin. The proximity switch detects the movement of the positioning pin, and the problems that at the present stage, a traditional sensor is not prone to stretching in for detection, the proximity switch is prone to being damaged due to direct detection, and cost is increased are solved.

Description

Technical Field

[0001] This utility model relates to the field of component testing, specifically to a nut testing device. Background Technology

[0002] In automotive body welding fixtures, nuts need to be sunk into the car body before welding. During welding, it is necessary to check whether there are nuts or whether the nuts are installed in place. Traditional sensors are not easy to insert for detection, and direct detection can easily damage the proximity switch, leading to increased costs.

[0003] Therefore, a nut detection device is proposed to solve the problems existing in the above-mentioned background technology. Utility Model Content

[0004] The purpose of this invention is to provide a nut detection device that facilitates the detection of nuts welded into the vehicle body. This solves the problems of traditional sensors being difficult to insert for detection and direct detection easily damaging proximity switches, leading to increased costs.

[0005] The technical solution of this utility model is as follows:

[0006] A nut detection device includes a connecting block, in which a positioning pin and a proximity switch are disposed. A compression spring is sleeved on the upper section of the positioning pin. The proximity switch is installed perpendicular to the installation position of the positioning pin. The proximity switch detects the movement of the positioning pin.

[0007] Further specified, the connecting block is provided with mounting holes, the mounting holes are stepped and penetrate the connecting block, the center line of the mounting holes is parallel to the center line of the connecting block, the stepped mounting holes are divided into upper holes and lower holes, the positioning pin passes through the mounting holes, the upper section of the positioning pin is provided with a mounting plate, the compression spring is sleeved on the outer surface of the positioning pin between the mounting plate and the lower bottom surface of the upper hole, and the lower part of the positioning pin is engaged with a retaining spring, the outer diameter of the retaining spring is larger than the diameter of the lower hole, the retaining spring is used to limit the positioning pin.

[0008] Further defined, the positioning pin includes a detection pin head and a pin shaft, the pin shaft being "I" shaped, having a large outer end face and a small outer end face, and also includes two bushings, one bushing being disposed on the large outer end face between the compression spring and the small outer end face, and the other being disposed on the large outer end face between the small outer end face and the retaining ring, the outer diameter of the bushing matching the inner diameter of the lower hole, and the bushing being disposed within the lower hole.

[0009] Furthermore, the connecting block is also provided with a positioning hole, and the proximity switch is installed in the positioning hole. The position of the positioning hole is perpendicular to the position of the mounting hole. In the initial state, the sensor of the proximity switch corresponds to the small outer end face of the pin.

[0010] The advantages of this utility model over the current technology are as follows:

[0011] 1. Two bushings are provided to reduce wear and prevent direct contact between the locating pin and the connecting block, thereby reducing wear and increasing service life.

[0012] 2. In the initial state, the sensor of the proximity switch corresponds to the small outer end face of the pin. When the positioning pin is compressed, the compression spring will rebound. When the positioning pin moves downward, the large outer end face of the positioning pin is detected and a signal is sent, and the nut is in place. If the nut is not in place, the positioning pin will not move downward and the sensor will not send a signal, which solves the problem that traditional sensors are not easy to insert for detection. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0014] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0015] Figure 3 This is a cross-sectional schematic diagram of the pin shaft of this utility model.

[0016] The markings in the diagram correspond to: 1-connecting block, 2-positioning hole, 3-upper hole, 31-lower hole, 4-positioning pin, 41-detection pin head, 42-pin shaft, 43-large outer end face, 44-small outer end face, 5-bushing, 6-mounting plate, 7-compression spring, 8-circlip, 9-proximity switch, 10-waisted groove. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments. Example

[0018] like Figures 1-3As shown, a nut detection device includes a connecting block 1. The connecting block 1 has a mounting hole and a positioning hole 3. The mounting hole is stepped and penetrates the connecting block 1. The centerline of the mounting hole is parallel to the centerline of the connecting block. The stepped mounting hole is divided into an upper hole 3 and a lower hole 31. A positioning pin 4 passes through the mounting hole. The positioning pin 4 includes a detection pin head 41 and a pin shaft 42. The pin shaft 42 is I-shaped, forming a large outer end face 43 and a small outer end face 44. A mounting plate 6 is provided at the junction of the pin shaft 42 and the detection pin head 41 at the upper end of the positioning pin 4. A compression spring 7 is provided between the mounting plate 6 and the lower bottom surface of the upper hole 3. The compression spring 7 is sleeved on the large outer end face 43 of the pin shaft 42 between the mounting plate 6 and the upper hole 3. The lower part of pin 4 is fitted with a retaining ring 8. The outer diameter of retaining ring 8 is larger than the diameter of the lower hole 31. Retaining ring 8 is used to limit the positioning pin 4. It also includes two bushings 5. One bushing 5 is set on the large outer end face 43 between the compression spring 7 and the small outer end face 44. The other bushing 5 is set on the large outer end face 43 between the small outer end face 44 and the retaining ring 8. The outer diameter of bushing 5 matches the inner diameter of the lower hole 31. Bushing 5 is set in the lower hole 31. A proximity switch 9 is set in the positioning hole 2. The position of positioning hole 2 is perpendicular to the position of mounting hole. In the initial state, the sensor of proximity switch 9 corresponds to the small outer end face 44 of pin 42. The connecting block is also provided with two waist-shaped grooves 10 to facilitate the installation of nut detection device.

[0019] After the workpiece is mounted, the nut is inspected. When the nut is detected, the positioning pin 4 is compressed, which causes the compression spring 7 to rebound and the positioning pin 4 to move downward. In the initial state, the sensor of the proximity switch 9 corresponds to the small outer end face 44 of the pin 42. When the positioning pin 4 moves downward, the large outer end face 43 of the pin 42 will also move downward. When the sensor of the proximity switch 9 detects the large outer end face 43 of the pin 42, it sends a signal to indicate that the nut is installed in place. If the nut is not installed in place, the positioning pin 4 will not move downward, and the sensor of the proximity switch 9 will not send a signal. The two bushings 5 ​​can reduce wear and prevent direct contact between the positioning pin 4 and the connecting block 1, thereby reducing wear and increasing service life.

[0020] The above provides a detailed description of a nut detection device provided by this utility model. The description of the specific embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the present utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A nut detection apparatus, characterized by: The system includes a connecting block (1), which contains a positioning pin (4) and a proximity switch (9). A compression spring (7) is sleeved on the upper part of the positioning pin (4). The proximity switch (9) is installed perpendicular to the installation position of the positioning pin (4). The proximity switch (9) detects the movement of the positioning pin (4). The connecting block (1) has a mounting hole. The mounting hole is stepped and passes through the connecting block (1). The center line of the mounting hole is parallel to the center line of the connecting block (1). The stepped mounting hole is divided into an upper hole (3) and a lower hole (31). The positioning pin (4) passes through the mounting hole. A mounting plate (6) is provided on the upper part of the positioning pin (4). The compression spring (7) is sleeved on the mounting plate (6) and the lower part of the upper hole (31). On the outer surface of the positioning pin (4) between the bottom surfaces, a retaining ring (8) is snapped onto the lower part of the positioning pin (4). The outer diameter of the retaining ring (8) is larger than the diameter of the lower hole (31). The retaining ring (8) is used to limit the positioning pin (4). The positioning pin (4) includes a detection pin head (41) and a pin shaft (42). The pin shaft (42) is "I" shaped and has a large outer end face (43) and a small outer end face (44). It also includes two bushings (5). One bushing (5) is disposed on the large outer end face (43) between the compression spring (7) and the small outer end face (44). The other bushing is disposed on the large outer end face (43) between the small outer end face (44) and the retaining ring (8). The outer diameter of the bushing (5) matches the inner diameter of the lower hole (31). The bushing (5) is disposed in the lower hole (31).

2. The nut detection device of claim 1, wherein: The connecting block (1) is also provided with a positioning hole (2), and the proximity switch (9) is installed in the positioning hole (2). The position of the positioning hole (2) is perpendicular to the position of the mounting hole. In the initial state, the sensor of the proximity switch (9) corresponds to the small outer end face (44) of the pin (42).

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