Nut mistake-proofing device

Abstract

This utility model discloses a nut anti-misinstallation device, belonging to the field of mechanical automation testing technology. The device includes a base plate, and an internal thread detection mechanism and an external thread detection mechanism fixed on the top of the base plate. The internal thread detection mechanism includes a support frame, an extension plate, and a rotary telescopic cylinder fixed on the extension plate. A connecting column is detachably connected to the output end of the cylinder, and a positioning pin with external threads is provided at the bottom end of the connecting column. The external thread detection mechanism includes a base fixed on the base plate, and a plate groove is provided on the top of the base. A replacement plate is detachably installed in the plate groove. A mold groove is opened on the top of the replacement plate, and a locking pin is provided at the bottom to engage with the plate groove. The central axis of the positioning pin is aligned with the center of the mold groove. This utility model achieves shape screening and precise positioning through the mold groove, and then automatically detects the internal thread by the positioning pin, realizing dual error prevention. Moreover, the components are replaceable, with strong versatility, solving the problems of inability to distinguish internal threads and inaccurate positioning, and achieving high detection efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of mechanical automation testing technology, and in particular to a nut anti-misinstallation device. Background Technology

[0002] In modern industrial production, especially in automated assembly lines, nuts are a basic and critical fastener. The accuracy of their installation directly affects the quality and safety of the final product. If nuts are mixed, installed incorrectly, or missing, it may lead to connection failure or even serious safety accidents.

[0003] To prevent incorrect installation, existing technical solutions typically rely on screening the external dimensions of nuts by setting up physical templates or channels that match the outer diameter or edge distance of standard nuts. Nuts that do not match the dimensions cannot pass through. Although this method can eliminate obvious shape errors, its detection dimensions are very limited.

[0004] This method of screening based on appearance has the drawback that it cannot handle the error prevention requirements of nuts with similar appearance but different internal threads. In actual production, there are often nuts with completely identical external dimensions, but completely different pitch, nominal diameter, or even direction of rotation of the internal threads. Existing simple tooling cannot identify such differences, causing unqualified nuts to still enter the assembly process. This passive screening method is also difficult to integrate with automated active detection functions, lacks reliable positioning and clamping, resulting in low detection efficiency and accuracy.

[0005] Therefore, this utility model proposes a nut anti-misinstallation device to address the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems in the existing nut anti-misinstallation devices, such as the inability to effectively distinguish between similar-looking nuts with different internal thread specifications, directions of rotation, or front and back sides, and the difficulty in achieving automated and precise positioning and clamping, this utility model aims to provide a nut anti-misinstallation device with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a nut anti-misinstallation device, including a base plate, and an internal thread detection mechanism and an external thread detection mechanism fixedly connected to the top of the base plate.

[0008] The internal texture detection mechanism includes a support frame fixed to the top of the base plate, an extension plate fixedly connected to the support frame, a rotary telescopic cylinder fixedly on the extension plate, a connecting column detachably connected to the output end of the rotary telescopic cylinder, and a positioning pin with external threads integrally formed at the end of the connecting column away from the rotary telescopic cylinder.

[0009] Furthermore, the external texture detection mechanism includes a base fixed to the top of the base plate. The top of the base has a plate groove, and a replacement plate is detachably installed in the plate groove. The top of the replacement plate has a mold groove, and the bottom of the plate is provided with multiple locking columns, which are engaged with the plate groove of the base.

[0010] The central axis of the positioning pin of the internal texture detection mechanism is directly opposite to the center of the mold groove of the external texture detection mechanism, forming a detection structure that works in tandem to ensure the accuracy of positioning during internal texture detection.

[0011] Preferably, the output end of the rotary telescopic cylinder is fixedly connected to a grooved connector, and the connecting column is provided with a limiting ring that engages with the groove of the connector. The connecting column achieves a convenient and reliable detachable connection through the engagement of the limiting ring with the connector, making it easy to replace connecting columns of different specifications.

[0012] Preferably, the support frame and the extension plate are fixedly connected by multiple reinforcing ribs. The support frame, extension plate and reinforcing ribs together form a high-rigidity L-shaped support structure to ensure the stability of the internal texture detection mechanism during operation and prevent shaking when the rotary telescopic cylinder is working.

[0013] Preferably, an electrical box is also fixedly connected to the outer wall of the support frame. The electrical box provides a power source for the detection work of the rotary telescopic cylinder through an internal circuit, making the device structure more compact and integrated.

[0014] Preferably, an inner groove is provided on the base plate at a position directly below the base. The inner groove provides operating space for the disassembly and assembly of the replacement plate, making it easier for the operator to push the replacement plate out from the bottom and improving the replacement efficiency.

[0015] Preferably, the nut anti-misinstallation device further includes a pad, which is fixedly connected to the bottom surface of the base plate by bolts or welding, and is used to reduce pressure, buffer and stabilize the entire device, thereby improving the smoothness of equipment operation.

[0016] Preferably, the mold groove is used to accommodate the sample as the test piece, and the inner wall contour of the mold groove is completely matched with the outer contour of the sample. This design allows the mold groove to perform matching detection on its outer diameter while locking the sample, thus realizing the function of shape screening.

[0017] Preferably, the external texture of the locating pin surface matches the specifications of the internal thread of the nut to be inspected, so that the rotary telescopic cylinder can drive the locating pin to move and rotate during operation, and make a trial threaded connection with the nut clamped in the mold groove, thereby judging whether the internal thread is qualified by whether the engagement is smooth.

[0018] This utility model has the following beneficial effects:

[0019] 1. This utility model solves the problem that existing technologies cannot distinguish nuts with similar appearances but different internal threads by setting up an internal thread detection mechanism and an external thread detection mechanism that work together, and aligning the positioning pin of the internal thread detection mechanism with the center of the mold groove of the external thread detection mechanism. This achieves the technical effect of double accurate detection of the external thread and internal thread, and effectively prevents confusion of specifications or reverse installation.

[0020] 2. This utility model solves the problems of existing detection devices having a fixed structure, being only applicable to a single specification of nut, and having poor versatility by setting the positioning pin of the internal texture detection mechanism to be detachably connected via a connecting column and setting the mold groove of the external texture detection mechanism on a detachable replacement plate. It achieves the technical effect of being able to flexibly replace the detection module to adapt to the detection needs of different specification nuts, and reduces equipment switching costs.

[0021] 3. This utility model uses a rotary telescopic cylinder to drive the positioning pin to automatically perform engagement detection, and uses the mold groove in the external pattern detection mechanism to accurately position and clamp the nut. This solves the problems of existing technologies that rely on manual inspection, are inefficient, and have inaccurate positioning. It achieves the technical effect of automated inspection process and accurate and reliable positioning, and significantly improves production efficiency. Attached Figure Description

[0022] Figure 1 This is a perspective view of the nut anti-misinstallation device proposed in this utility model;

[0023] Figure 2 This is a front view of the nut anti-misinstallation device proposed in this utility model;

[0024] Figure 3 This is a cross-sectional view of the base plate of the nut anti-misinstallation device proposed in this utility model;

[0025] Figure 4 This is a schematic diagram of the base of the nut anti-misinstallation device proposed in this utility model.

[0026] Legend:

[0027] 1. Base plate; 2. Internal texture detection mechanism; 201. Support frame; 202. Electrical box; 203. Extension plate; 204. Reinforcing rib; 205. Rotary telescopic cylinder; 206. Connector; 207. Connecting column; 208. Limiting ring; 209. Positioning pin; 3. External texture detection mechanism; 301. Base; 302. Inner groove; 303. Plate groove; 304. Replacement plate; 305. Engaging column; 306. Mold groove; 307. Sample; 4. Pad plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] Example:

[0030] Please refer to Figures 1 to 4 This utility model provides a nut mis-assembly prevention device, which aims to solve the problem in the prior art that it is difficult to efficiently and accurately distinguish nuts that look similar but have different internal thread specifications, directions of rotation or front and back sides, resulting in a high risk of mis-assembly in automated assembly.

[0031] like Figure 1 and Figure 2 As shown, the nut anti-misinstallation device includes a base plate 1, and an internal thread detection mechanism 2 and an external thread detection mechanism 3 respectively fixedly connected to the top of the base plate 1. The internal thread detection mechanism 2 is used to automatically detect the internal thread of the nut, while the external thread detection mechanism 3 is used to screen the shape of the nut and achieve precise positioning. The internal thread detection mechanism 2 and the external thread detection mechanism 3 cooperate with each other in structure, and their key execution components and positioning components are set with their central axes facing each other, thereby realizing continuous and accurate detection from the external shape to the internal thread.

[0032] Specifically, the internal texture detection mechanism 2 includes a support frame 201, which is bolted to the top left side of the base plate 1; an extension plate 203 extending forward is fixedly connected to the support frame 201, and the support frame 201 and the extension plate 203 are also fixedly connected by multiple reinforcing ribs 204, thus forming a sturdy L-shaped support structure; a rotary telescopic cylinder 205 is fixedly installed on the extension plate 203, and a grooved connector 206 is fixedly connected to the output end of the rotary telescopic cylinder 205; the internal texture detection mechanism 2 also includes a replaceable connector The upper end of the column 207 is provided with a limiting ring 208 that matches the groove of the connector 206. The connecting column 207 is detachably connected to the rotary telescopic cylinder 205 by the engagement between the limiting ring 208 and the connector 206. At the bottom end of the connecting column 207 away from the rotary telescopic cylinder 205, a positioning pin 209 with external threads is integrally formed. In addition, the electrical box 202 is fixedly connected to the outer wall of the support frame 201. The electrical box 202 provides power for the extension and rotation of the rotary telescopic cylinder 205 through its internal circuit.

[0033] To solve the above-mentioned technical problems, the technical solution of this embodiment is that the external texture detection mechanism 3 of the nut anti-misinstallation device forms a specific structural cooperation and connection relationship with the aforementioned base plate 1 and internal texture detection mechanism 2, so as to jointly realize the screening, positioning and detection of nuts.

[0034] Please refer to Figure 1 , Figure 2 and Figure 4 The external texture detection mechanism 3 includes a base 301, which is fixedly connected to the top right side of the base plate 1 by welding or bolting. A circular groove 303 is provided on the top of the base 301, and a replacement plate 304 is detachably installed inside the groove 303. Four locking posts 305 for positioning and fixing are integrally provided on the bottom of the replacement plate 304. These four locking posts 305 are engaged with the inner wall of the groove 303 of the base 301 by interference fit or snap fastening, ensuring the stability of the replacement plate 304 during operation. A mold groove 306 is provided at the top center of the replacement plate 304 for directly accommodating and limiting the nut to be tested. Its function is to provide a replaceable, high-precision positioning reference for nuts of different specifications and to perform preliminary screening of their external dimensions.

[0035] The internal thread detection mechanism 2 is precisely aligned with the external thread detection mechanism 3. In the assembled state, the central axis of the positioning pin 209 of the internal thread detection mechanism 2 is strictly aligned with and coaxial with the central axis of the mold groove 306 of the external thread detection mechanism 3. This vertical alignment structure ensures that when the rotary telescopic cylinder 205 drives the positioning pin 209 to move downward, the positioning pin 209 can accurately enter the central hole of the nut held by the mold groove 306, providing the necessary prerequisite for subsequent thread engagement detection. By replacing the replacement plate 304 of different specifications, nuts of different outer diameters can be matched. With the replacement of the corresponding specifications of the connecting column 207 and positioning pin 209, it is possible to achieve the detection of incorrect assembly of nuts of various specifications.

[0036] As a preferred embodiment, to further improve the overall structural strength and operational stability of the device, please refer to... Figure 1 and Figure 2Multiple reinforcing ribs 204 are fixedly connected between the support frame 201 and the extension plate 203 by welding. These reinforcing ribs 204 firmly connect the support frame 201 and the extension plate 203 into a whole, forming a high-rigidity L-shaped support structure. At the same time, an electrical box 202 is also fixedly connected to the outer wall of the support frame 201. The electrical box 202 is electrically connected to the rotary telescopic cylinder 205 through an internal circuit, providing a stable and reliable power source for the automated detection work of the device. In addition, a pad 4 is fixedly connected to the bottom surface of the base plate 1 of the entire device by bolts or welding. The pad 4 is preferably made of high-elasticity rubber material, which is used to reduce and buffer the vibration generated by the nut anti-misinstallation device during operation and improve the overall stability of the support.

[0037] As another preferred implementation method, in order to achieve modularity and high-precision matching of the detection, please refer to... Figure 3 and Figure 4 The inner wall contour of the mold groove 306 is precisely machined to perfectly match the outer contour of the sample 307, which is the part to be tested. When the sample 307 is placed in the mold groove 306, it can achieve a gapless engagement. This not only allows for the matching test of the outer diameter of the sample 307, but also provides a firm clamping. Correspondingly, the external texture of the locating pin 209 is also precisely machined to a standard thread that perfectly matches the internal thread specification of the nut to be inspected. In order to facilitate the replacement of different specifications of test parts, the output end of the rotary telescopic cylinder 205 is fixedly connected to a grooved connector 206, and the upper end of the connecting column 207 is integrally formed with a limiting ring 208 that can engage with the groove of the connector 206. Through this engaging connection, the connecting column 207 and the locating pin 209 at its bottom can be quickly disassembled and replaced.

[0038] As another preferred embodiment, in order to improve the replacement efficiency of replacement board 304, please refer to... Figure 3 An inner groove 302 is provided on the base plate 1 directly below the base 301. The presence of the inner groove 302 provides operating space for the operator's fingers or auxiliary tools to push the replacement plate 304 out from the bottom, thus making the process of replacing the replacement plate 304 of different specifications more labor-saving and convenient.

[0039] Working Principle: The device employs two detection methods to prevent incorrect nut placement. A support frame 201 is fixed to the top left side of the base plate 1. An electrical box 202 is fixed to the left side of the support frame 201 to provide power for the detection operation. The support frame 201 is fixedly connected to the extension plate 203 via multiple reinforcing ribs 204. A rotary telescopic cylinder 205 is fixed to the top of the extension plate 203. The support frame 201, extension plate 203, and reinforcing ribs 204 form an L-shaped support structure, along with a pressure-reducing buffer plate 4, all used to maintain stable support. The output end of the rotary telescopic cylinder 205 penetrates the extension plate 203 and is located at the bottom of the extension plate 203, forming a connector 206. The connector 206 connects to the... The connecting column 207 is snap-fitted and can be disassembled and replaced. The connecting column 207 is equipped with a limit ring 208. The engagement of the limit ring 208 with the groove of the connector 206 indicates successful installation. The bottom of the connecting column 207 has a protruding positioning pin 209. Its surface has external textures that match the internal texture of the nut to be inspected. During inspection, the rotating telescopic cylinder 205 drives the positioning pin 209 to move and rotate. If it can smoothly connect with the clamped nut by thread, it is the required nut and direction. This internal texture detection mechanism 2 can handle the problem of front and back that is difficult to judge with the naked eye, or nuts with different internal textures but similar sizes. It can also replace the positioning pin 209 of different specifications for the inspection of nuts of different specifications.

[0040] Furthermore, the device also includes an external texture detection mechanism 3. A base 301 is fixed to the top right side of the base plate 1. A circular groove 303 is opened on the top of the base 301, with the center of the groove directly opposite the positioning pin 209. The base plate 1 also has an inner groove 302, located directly below the base 301. A detachable replacement plate 304 has four locking posts 305, which can engage with the groove 303 to form a fixed position. Different replacement plates 304 can be easily replaced using the handle on the replacement plate 304. A mold groove 306 is opened on the top of the replacement plate 304. The shape inside the groove is consistent with the size of the nut to be tested. That is, the sample 307 placed inside can perfectly engage with the mold groove 306, which is the required nut. This is used for simple testing when there is no need to care about the front or back or only the specifications need to be determined. Of course, it is also used to cooperate with the internal texture detection mechanism 2 to determine whether the outer diameter of the nut matches, and to engage the nut, which facilitates the rotation inspection of the positioning pin 209.

Claims

1. A nut anti-misinstallation device, comprising a base plate (1), wherein an internal thread detection mechanism (2) and an external thread detection mechanism (3) are fixedly connected to the top of the base plate (1); The internal texture detection mechanism (2) includes a support frame (201) fixedly connected to the top of the base plate (1), an extension plate (203) fixedly connected to the support frame (201), a rotary telescopic cylinder (205) fixedly connected to the extension plate (203), a connecting column (207) detachably connected to the output end of the rotary telescopic cylinder (205), and a positioning pin (209) with external threads integrally formed at the end of the connecting column (207) away from the rotary telescopic cylinder (205). characterized in that The external texture detection mechanism (3) includes a base (301) fixedly connected to the top of the base plate (1). The top of the base (301) is provided with a plate groove (303). A replacement plate (304) is detachably installed in the plate groove (303). The top of the replacement plate (304) is provided with a mold groove (306). The bottom of the replacement plate (304) is provided with multiple engaging posts (305) that engage with the plate groove (303). Furthermore, the central axis of the positioning pin (209) of the internal texture detection mechanism (2) is directly opposite to the center of the mold groove (306) of the external texture detection mechanism (3).

2. The nut mistake mounting device according to claim 1, characterized in that, The output end of the rotary telescopic cylinder (205) is fixedly connected to a grooved connector (206). The connecting post (207) is provided with a limiting ring (208) that engages with the groove of the connector (206). The connecting post (207) is detachably connected to the connector (206) through the engagement of the limiting ring (208) with the connector (206).

3. The nut anti-misinstallation device according to claim 1, characterized in that, The support frame (201) and the extension plate (203) are fixedly connected by multiple reinforcing ribs (204), and the support frame (201), the extension plate (203) and the reinforcing ribs (204) together constitute an L-shaped support structure.

4. The nut anti-misinstallation device according to claim 1, characterized in that, An electrical box (202) is fixedly connected to the outer wall of the support frame (201). The electrical box (202) provides a power source for the detection work of the rotary telescopic cylinder (205) through its internal circuit.

5. The nut anti-misinstallation device according to claim 1, characterized in that, An inner groove (302) is provided on the base plate (1) at a position directly below the base (301). The inner groove (302) is used to provide operating space for the disassembly and assembly of the replacement plate (304).

6. The nut mistake mounting device according to claim 1, characterized in that, It also includes a pad (4), which is fixedly connected to the bottom surface of the base plate (1) by bolts or welding, and is used to reduce pressure, buffer and stabilize the nut anti-misinstallation device.

7. The nut mistake-proofing device according to claim 1, characterized by The mold groove (306) is used to accommodate the sample (307) as the test piece. The inner wall contour of the mold groove (306) is completely matched with the outer contour of the sample (307). While engaging the sample (307), the matching of its outer diameter is detected.

8. The nut anti-misinstallation device according to claim 1, characterized in that, The external texture of the locating pin (209) matches the specifications of the internal texture of the nut to be inspected. When the rotary telescopic cylinder (205) is working, it drives the locating pin (209) to move and rotate so as to make a threaded connection with the nut clamped in the mold groove (306).

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