A special mistake-proofing detection tool for a rack M8 nut

Abstract

A special mistake-proof detection tool for a rack M8 nut comprises a fixed support, a telescopic cylinder arranged on the fixed support, and a detection assembly arranged on the piston rod shaft end of the telescopic cylinder. The detection assembly comprises a mounting shell, which is fixedly connected with the telescopic cylinder through a connecting plate. The mounting shell has a cavity structure and is provided with a movable positioning pin and a spring in the cavity. The center line of the movable positioning pin is arranged in a straight line with the center line of the M8 nut to be detected. A positioning pin contact end of the movable positioning pin extends out of the mounting shell. A positioning pin detection end of the movable positioning pin is completely left in the cavity of the mounting shell. A position switch is further arranged on the mounting shell, and a switch detection end of the position switch extends into the cavity of the mounting shell. The special mistake-proof detection tool has a more compact structure, occupies a smaller space for installation, and has better dustproof and protective effects because the switch detection end and the positioning pin detection end are arranged in the cavity of the mounting shell.

Description

Technical Field

[0001] This utility model relates to a special error-proofing inspection tooling for M8 nuts on machine frames. Background Technology

[0002] M8 nuts are usually pre-installed at the structural through holes of the frame and chassis, typically through press-fitting or welding. Later, other components are assembled and connected to the frame and chassis using compatible M8 bolts. However, during actual installation, due to worker errors or the presence of M6 nuts mixed in with the M8 nut stock, the installed nuts may be too small. In such cases, rework is very inconvenient. Therefore, the workshop usually has an inspection process to ensure the accuracy of the dimensions of the pre-installed M8 nuts.

[0003] While existing technologies suggest methods to detect missing nuts by moving locating pins, missing nuts and incorrect installation are two different situations, with missing nuts being more easily detected visually. Furthermore, in existing nut detection fixtures, the detection switch is typically a component independently mounted at the rear end of the locating pin, used to detect changes in the position of the pin's detection end. The nut installation detection fixture mentioned in publication number CN218787790U can be considered an example of existing technology. However, existing nut detection fixtures suffer from problems such as large structural volume and significant space requirements, and the cleanliness of the workshop environment may also affect the detection switch's performance.

[0004] In view of this, this solution provides a dedicated error-proofing inspection fixture for M8 nuts on a machine frame. Utility Model Content

[0005] To address the shortcomings mentioned above, this utility model provides a dedicated error-proofing inspection fixture for M8 nuts on machine frames.

[0006] To achieve the above objectives, this utility model provides a dedicated error-proof detection fixture for M8 nuts on a machine frame, including a fixed bracket, a telescopic cylinder mounted on the fixed bracket, and a detection assembly mounted on the piston rod shaft end of the telescopic cylinder. The detection assembly includes a mounting housing, which is fixedly connected to the telescopic cylinder via a connecting plate. The mounting housing has a cavity structure, and a movable positioning pin and a spring are installed in the cavity. The centerline of the movable positioning pin is aligned with the centerline of the M8 nut to be detected. The positioning pin contact end of the movable positioning pin extends outside the mounting housing, while the positioning pin detection end remains completely within the cavity of the mounting housing. A position switch is also installed on the mounting housing, with its detection end extending into the cavity of the mounting housing. When the movable positioning pin is extended, the detection end of the switch and the detection end of the positioning pin are close to each other. When the movable positioning pin retracts against the elastic force of the spring, the detection end of the switch and the detection end of the positioning pin are offset. At this time, the position switch is illuminated to warn the inspector.

[0007] As a further improvement to the solution, the fixed bracket includes a lower fixed seat, a lower fixed bolt, a fixed shaft, an upper fixed seat, and an upper fixed bolt. The upper end of the fixed shaft is machined with a shaft flat section, and the upper fixed seat is configured at the shaft flat section by the upper fixed bolt to ensure the overall stability of the fixed bracket.

[0008] As a further improvement to the solution, the telescopic cylinder is fixed on the upper fixed seat, and a rubber block is disposed between the telescopic cylinder and the upper fixed seat.

[0009] As a further improvement to the solution, the telescopic cylinder is a double-rod cylinder.

[0010] As a further improvement to the solution, the movable positioning pin also has a frustum-shaped guide portion formed on the contact end of the positioning pin, so as to more easily enter the central hole of the M8 nut to be tested.

[0011] The advantages of this utility model over the prior art are as follows: the special error-proof detection fixture for the M8 nut of the frame has a more compact structure and occupies less space for installation. Moreover, the switch detection end and the positioning pin detection end are both configured inside the cavity of the mounting housing, which has better dustproof and protective effects. Even in a production environment with low cleanliness, the functionality of the detection fixture can be guaranteed. Attached Figure Description

[0012] Figure 1 This is a perspective view of a special error-proofing inspection fixture for an M8 nut on a machine frame. Figure 2An exploded view of a special error-proofing inspection fixture for an M8 nut on a machine frame. Figure 3 This is a cross-sectional view of a special error-proofing inspection fixture for an M8 nut on a machine frame.

[0013] In the diagram: 1. Fixed bracket; 11. Lower fixed seat; 12. Lower fixed bolt; 13. Fixed shaft; 131. Shaft flat square; 14. Upper fixed bolt; 15. Upper fixed seat; 2. Rubber block; 3. Telescopic cylinder; 4. Detection assembly; 41. Connecting plate; 42. Mounting housing; 43. Spring; 44. Moving positioning pin; 441. Positioning pin detection end; 442. Positioning pin contact end; 45. Position switch; 451. Switch detection end; 5. M8 nut. Detailed Implementation

[0014] like Figure 1 , Figure 2 and Figure 3 As shown, a special error-proof detection fixture for an M8 nut on a frame according to an embodiment of this utility model includes a fixed bracket 1, a telescopic cylinder 3 mounted on the fixed bracket 1, and a detection component 4 mounted on the piston rod shaft end of the telescopic cylinder 3. The detection component 4 includes a mounting housing 42, which is fixedly connected to the telescopic cylinder 3 via a connecting plate 41. The mounting housing 42 has a cavity structure, and a movable positioning pin 44 and a spring 43 are installed in the cavity. The center line of the movable positioning pin 44 is aligned with the center line of the M8 nut 5 to be detected. The positioning pin contact end 442 of the movable positioning pin 44 extends out of the mounting housing 42, while the positioning pin detection end 441 of the movable positioning pin 44 remains completely inside the cavity of the mounting housing 42. A position switch 45 is also installed on the mounting housing 42, and the switch detection end 451 of the position switch 45 extends into the cavity of the mounting housing 42. When the movable positioning pin 44 is in the extended state... The switch detection end 451 and the positioning pin detection end 441 are close to each other. When the moving positioning pin 44 retracts against the elastic force of the spring 43, the positions of the switch detection end 451 and the positioning pin detection end 441 are offset. At this time, the position switch 45 is lit to warn the tester. The fixed bracket 1 includes a lower fixed seat 11, a lower fixed bolt 12, a fixed shaft 13, an upper fixed seat 15, and an upper fixed bolt 14. The upper end of the fixed shaft 13 is machined with a shaft flat 131. The upper fixed seat 15 is configured at the shaft flat 131 by the upper fixed bolt 14 to ensure the overall stability of the fixed bracket 1. The telescopic cylinder 3 is fixed on the upper fixed seat 15, and a rubber block 2 is arranged between the telescopic cylinder 3 and the upper fixed seat 15. The telescopic cylinder 3 is a double-rod cylinder. The moving positioning pin 44 also has a frustum-shaped guide part formed on the positioning pin contact end 442 to facilitate its entry into the middle hole of the M8 nut 5 to be tested.

[0015] The dedicated error-proof detection fixture for the M8 nut has a more compact structure and occupies less space for installation. The switch detection end and the positioning pin detection end are both configured inside the cavity of the mounting housing, which has better dustproof and protective effects. Even in production environments with low cleanliness, the functionality of the detection fixture can be guaranteed.

[0016] In practical use, for ease of understanding of this utility model, it will be described in conjunction with the accompanying drawings; The main body size of the movable positioning pin 44 is adapted to the M8 nut, that is, the size is slightly less than 8mm, for example, it can be in the range of 7.7~7.9mm. When the nut to be tested is an M8 nut, after the telescopic cylinder is activated, the movable positioning pin 44 passes directly through the middle of the nut to be tested. If the nut to be tested is an M6 nut (installation error), after the telescopic cylinder is activated, the movable positioning pin 44 cannot pass through the middle of the nut to be tested, the spring 43 is compressed, the position of the positioning pin detection end 441 and the switch detection end 451 are offset from each other, and the position switch 45 is lit. Then the inspector can intuitively know that there is a dimensional deviation in the installation of the nut at this position. The inspector can mark it for rework and secondary installation.

[0017] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A special error-proofing inspection fixture for an M8 nut on a machine frame, comprising a fixed bracket (1), a telescopic cylinder (3) mounted on the fixed bracket (1), and a detection assembly (4) mounted on the piston rod shaft end of the telescopic cylinder (3), characterized in that: The detection component (4) includes a mounting housing (42), which is fixedly connected to the telescopic cylinder (3) via a connecting plate (41). The mounting housing (42) has a cavity structure and a movable positioning pin (44) and a spring (43) are installed in the cavity. The center line of the movable positioning pin (44) is aligned with the center line of the M8 nut (5) to be detected. The positioning pin contact end (442) of the movable positioning pin (44) extends outside the mounting housing (42), while the positioning pin detection end (441) of the movable positioning pin (44) remains completely within the mounting housing (42). Inside the cavity, a position switch (45) is also installed on the mounting housing (42). The switch detection end (451) of the position switch (45) extends into the cavity of the mounting housing (42). When the movable positioning pin (44) is in the extended state, the switch detection end (451) and the positioning pin detection end (441) are close to each other. When the movable positioning pin (44) retracts against the elastic force of the spring (43), the switch detection end (451) and the positioning pin detection end (441) are offset from each other. At this time, the position switch (45) is lit to warn the inspector.

2. The special error-proofing inspection fixture for an M8 nut on a machine frame according to claim 1, characterized in that: The fixed bracket (1) includes a lower fixed seat (11), a lower fixed bolt (12), a fixed shaft (13), an upper fixed seat (15), and an upper fixed bolt (14). The upper end of the fixed shaft (13) is machined with a shaft flat (131). The upper fixed seat (15) is arranged at the shaft flat (131) by the upper fixed bolt (14) to ensure the overall stability of the fixed bracket (1).

3. The special error-proofing inspection fixture for an M8 nut on a machine frame according to claim 2, characterized in that: The telescopic cylinder (3) is fixed on the upper fixed seat (15), and a rubber block (2) is disposed between the telescopic cylinder (3) and the upper fixed seat (15).

4. The special error-proofing inspection fixture for an M8 nut on a machine frame according to claim 1, characterized in that: The telescopic cylinder (3) is a double-rod cylinder.

5. The special error-proofing inspection fixture for an M8 nut on a machine frame according to claim 1, characterized in that: The movable positioning pin (44) also has a frustum-shaped guide portion formed on the positioning pin contact end (442) so as to more easily enter the middle hole of the M8 nut (5) to be tested.

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