A bolt detection device and a detection method thereof

Abstract

The application discloses a bolt detection device and a detection method thereof, and relates to the technical field of bolt detection, which comprises a detection table, a bolt positioning mechanism, a first detection mechanism and a second detection mechanism. The bolt positioning mechanism comprises a positioning seat, and the end of the positioning seat is provided with a positioning slot. A pushing block is movably arranged on the inner wall end face of the positioning slot. The bottom end of the positioning seat is provided with a deviation rectifying mechanism. The first detection mechanism is arranged on one side of the top end of the detection table close to the positioning slot. The second detection mechanism is arranged on the bottom end of the positioning seat. The bolt positioning mechanism can automatically adjust the bolt to a horizontal state for subsequent size detection. The cooperation of the first detection mechanism and the second detection mechanism can achieve size detection of the screw rod and the double-end position of the bolt, respectively. In the whole process, no manual intervention is needed, and the positioning and size detection of the bolt can be efficiently and quickly completed, the size detection efficiency and detection quality stability of the bolt are improved, the labor cost investment is reduced, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of bolt inspection technology, and in particular to a bolt inspection device and its inspection method. Background Technology

[0002] A bolt is a common fastener consisting of a head and a threaded shank. It is used in conjunction with a nut to fasten two parts with through holes. Bolts are typically made from coiled steel, processed through cutting, stamping, and thread rolling. After the bolts are formed, to ensure production quality, they are usually extracted and their dimensions are inspected.

[0003] In existing technologies, bolt size inspection mainly relies on manual labor with the aid of tools such as vernier calipers to measure each bolt individually, and then compare the measured values ​​with the set acceptable values ​​to detect bolts that do not meet the size requirements. This results in an excessive degree of manual involvement in the bolt size inspection process. Manual inspection is not only slow, but also highly susceptible to human factors, which can easily lead to unstable bolt size inspection quality. To address this, we propose a bolt inspection device and its inspection method. Summary of the Invention

[0004] The purpose of this invention is to provide a bolt detection device and method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a bolt detection device and its detection method, comprising: Testing station; A bolt positioning mechanism includes a positioning seat, the end of which is provided with a positioning slot, and the inner wall of the positioning slot is movably provided with a pusher block that moves and compresses the bolt in the horizontal direction. The bottom of the positioning seat is provided with a correction mechanism that corrects the position of the bolt. The first testing mechanism is located on the top of the testing platform near the positioning slot, and is used to test the length of the bolt thread. The second testing mechanism, located at the bottom of the positioning seat, is used to test the thickness of the bolt head.

[0006] Preferably, an L-shaped through hole is provided in the middle of the positioning slot so that the bottom end and side wall of the positioning slot are connected to the outside. A second translation drive component for driving the push block to translate is fixedly connected to the side of the positioning seat away from the positioning slot.

[0007] Preferably, the correction mechanism includes: A lifting plate, the top of which is rotatably connected to the bottom of the positioning seat, and a straight groove is provided on the side of the lifting plate facing the straight groove; A connecting plate, the top of which passes through a positioning slot and is fixedly connected to the bottom of the push block, the bottom of which extends to the bottom of the positioning seat and is rotatably connected to a T-shaped slider, the end of which is movably inserted into the inner cavity of a straight slide groove.

[0008] Preferably, the first testing institution includes: A support plate is fixedly connected to one side of the top of the testing table. A T-shaped rod is slidably inserted into the top of the linear slide groove through an opening. A first spring is fixedly connected between the T-shaped rod and the support plate. A first detection lamp is fixedly connected to the top of a support plate. A bent conductive sheet is fixedly connected to the inner wall of the support plate on both sides of the sliding hole. One of the bent conductive sheets is electrically connected to the first detection lamp, and the other bent conductive sheet is electrically connected to an external power source. A conductive rod is fixedly inserted into the end side wall of the T-shaped rod near the positioning seat, and the conductive rod is used for electrical connection between two bent conductive sheets; A sliding seat is fixedly connected to the bottom of the positioning seat and can move linearly along the top of the detection table. A first translation drive component that drives the sliding seat to move horizontally is fixedly connected to the top of the detection table.

[0009] Preferably, the support plate has a positioning baffle that is inserted into the T-shaped rod on the side away from the positioning seat, and a U-shaped conductive sheet is fixedly embedded on the side of the positioning baffle close to the support plate.

[0010] Preferably, a vertically movable extrusion plate is movably inserted into the inner cavity of the positioning baffle, a knob screw is threaded into the top of the positioning baffle, the bottom end of the knob screw extends downward and is rotatably connected to the top of the extrusion plate, and a straight groove is formed at the top of the T-shaped rod, the cross-section of the straight groove and the cross-section of the extrusion plate are both trapezoidal.

[0011] Preferably, the second testing institution includes: The externally threaded tube is horizontally positioned at the top of one side of the lifting plate. A second detection lamp is fixedly connected to the end of the externally threaded tube away from the lifting plate, and a position switch extending into the inner cavity of the externally threaded tube is fixedly connected to one side of the second detection lamp. The telescopic rod is movably inserted into one end of the external threaded pipe near the lifting plate. A second spring is fixedly connected between the telescopic rod and the inner cavity of the external threaded pipe. An eccentric protrusion is provided on the top of the lifting plate.

[0012] Preferably, a fixing plate is fixedly connected to the bottom end of the positioning seat, and an adjustment mechanism is provided on the fixing plate. The adjustment mechanism is used to adjust the horizontal distance between the external threaded pipe and the lifting plate.

[0013] Preferably, the adjusting mechanism includes a nut seat, which is fixedly inserted into the bottom of the fixing plate. The outer wall of the externally threaded tube is provided with an external thread, and the externally threaded tube is threadedly connected to the inner wall of the nut seat through the external thread.

[0014] A bolt inspection method, implementing any one of the bolt inspection devices described above, includes the following steps: S1. The bolt is vertically inserted into the positioning slot and penetrates the bottom of the positioning seat. The pushing block moves to press against the bolt head while driving the lifting plate to rotate, so that the lifting plate pushes the bolt from the vertical position to the horizontal position. In this way, the pushing block can squeeze the end face of the bolt head and keep the bolt horizontally positioned. S2. While the push block abuts against the end face of the bolt head, it drives the lifting plate to rotate at the corresponding angle. The lifting plate pushes the telescopic rod into the external threaded pipe through the eccentric protrusion at its head position until the telescopic rod just abuts against the closed switch and the second detection light is lit, indicating that the bolt head thickness is qualified. S3. The positioning seat moves and causes the bolt end face to press the T-shaped rod to move, so that the position of the conductive rod on the T-shaped rod moves to the position of the bent conductive piece, so that the two bent conductive pieces are coupled and connected. At this time, the first detection light is powered on and lit up, indicating that the bolt length detection is qualified.

[0015] The technical effects and advantages of this invention are as follows: This invention automatically adjusts bolts to a horizontal position using a bolt positioning mechanism for subsequent dimensional inspection. The horizontally positioned bolts, through the cooperation of a first and second inspection mechanism, allow for dimensional inspection of the bolt's thread and double-ended positions, identifying bolts with substandard dimensions. The entire process requires no manual intervention, enabling efficient and rapid bolt positioning and dimensional inspection. Compared to existing technologies that rely on manual measurement using calipers and other tools, this invention improves bolt dimensional inspection efficiency and quality stability while reducing labor costs and overall expenses.

[0016] In the first detection mechanism provided by the present invention, the power supply of the first detection lamp is realized by the translational T-shaped rod and the bendable conductive sheet and conductive rod. When the bolt pushes the T-shaped rod to a preset position, the first detection lamp lights up, thereby achieving the detection of the bolt length as qualified. Furthermore, the setting of the positioning baffle and its structure can realize the adjustment of the detection length and the detection of whether the first spring is working properly. Thus, the first detection mechanism can perform bolt detection of various lengths and realize the self-check of whether the first detection mechanism is working properly.

[0017] The second detection mechanism provided by the present invention can not only use the rotation of the lifting plate in the correction mechanism to detect the thickness of the bolt head, but also adjust the detection range of the second detection mechanism so that it can adapt to the detection of bolt heads of various thicknesses, thereby improving the adaptability of bolt detection. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a partial cross-sectional view of the front of the positioning seat of the present invention.

[0020] Figure 3 This is a frontal cross-sectional view of the second detection mechanism of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the first detection mechanism of the present invention.

[0022] Figure 5 This is a top sectional view of the support plate of the present invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the extrusion plate of the present invention.

[0024] In the attached diagram: 100, detection table; 101, sliding seat; 102, first translation drive component; 103, positioning seat; 104, positioning slot; 105, pushing block; 106, second translation drive component; 107, lifting plate; 108, connecting plate; 109, T-shaped slider; 110, linear slide groove; 111, eccentric protrusion; 112, fixing plate; 113, nut seat; 114, external threaded tube; 115, telescopic rod; 116, second detection light; 117, position switch; 118, second spring; 119, support plate; 120, T-shaped rod; 121, first spring; 122, conductive rod; 123, positioning baffle; 124, U-shaped conductive sheet; 125, knob screw; 126, extrusion plate; 127, bent conductive sheet; 128, first detection light. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides, for example Figures 1-6 The image shows a bolt detection device.

[0027] Example 1: Includes a testing platform 100, a bolt positioning mechanism, a first testing mechanism, and a second testing mechanism. The bolt positioning mechanism includes a positioning seat 103, with a positioning slot 104 at the end of the positioning seat 103. An L-shaped through hole is opened in the middle of the positioning slot 104, allowing the bottom and sidewall of the positioning slot 104 to communicate with the outside. A push block 105 for horizontally moving and pressing the bolt is movably provided on the inner wall end face of the positioning slot 104. A second translation drive 106 for driving the push block 105 to translate is fixedly connected to the side of the positioning seat 103 away from the positioning slot 104. A correction mechanism for correcting the bolt position is provided at the bottom of the positioning seat 103. The first testing mechanism is located at the top of the testing platform 100 near the positioning slot 104 to detect the bolt length. The second testing mechanism is located at the bottom of the positioning seat 103 to detect the bolt head thickness.

[0028] In this embodiment, a positioning slot 104 is provided at the end of the positioning seat 103, and the positioning slot 104 has an L-shaped through hole. After the bolt is inserted, its screw position extends downward to below the positioning seat 103, while the bolt head is blocked within the positioning seat 103. This allows the bolt to be positioned in the positioning slot 104. Then, in conjunction with the push block 105 and the correction mechanism, the bolt is adjusted to an inclined position. The push block 105 then provides horizontal lateral pressure to the bolt head end face, adjusting the bolt to a horizontal position for positioning. This eliminates the tedious manual adjustment of the bolt positioning; the bolt can be simply inserted vertically and positioned by the bolt positioning mechanism. The bolt is automatically adjusted to a horizontal position for subsequent dimensional inspection. With the first and second inspection mechanisms working together, the bolt's thread and double-ended positions can be inspected, identifying bolts with substandard dimensions. The entire process requires no manual intervention, efficiently and quickly completing bolt positioning and dimensional inspection. Compared to existing technologies that rely on manual measurement using calipers, this embodiment, employing a bolt positioning mechanism, a first inspection mechanism, and a second inspection mechanism, improves bolt dimensional inspection efficiency and quality stability while reducing labor costs and overall expenses.

[0029] The correction mechanism includes a lifting plate 107, the top of which is rotatably connected to the bottom of the positioning seat 103. A straight groove 110 is provided on the side of the lifting plate 107 facing the straight groove 110. The top of the connecting plate 108 passes through the positioning slot 104 and is fixedly connected to the bottom of the push block 105. The bottom of the connecting plate 108 extends to the bottom of the positioning seat 103 and is rotatably connected to a T-shaped slider 109. The end of the T-shaped slider 109 is movably inserted into the inner cavity of the straight groove 110. While the push block 105 moves horizontally, the connection plate 108, T-shaped slider 109, and linear groove 110 work together to cause the T-shaped slider 109 to move horizontally as the push block 105 moves. Simultaneously, the T-shaped slider 109 rotates via the linear groove 110, allowing the bottom of the lifting plate 107 to contact the bottom of the bolt's thread and lift it upwards. This adjusts the bolt from a vertical to an inclined position. Then, the end face of the push block 105 partially contacts the bolt head end face and provides lateral thrust, adjusting the bolt to a horizontal position for clamping and positioning. In other embodiments, to enhance the lifting effect of the lifting plate 107 on the bolt's thread position, the bottom of the lifting plate 107 can be bent towards the bolt side.

[0030] Example 2: Based on Example 1, the first detection mechanism is further described, including a support plate 119. The support plate 119 is fixedly connected to one side of the top of the detection table 100. A T-shaped rod 120 is slidably inserted into the top of the linear slide groove 110 through an opening. A first spring 121 is fixedly connected between the T-shaped rod 120 and the support plate 119. A first detection lamp 128 is fixedly connected to the top of the support plate 119. Bent conductive sheets 127 are fixedly connected to the inner cavity of the support plate 119 and to the inner walls on both sides of the sliding hole. One of the bent conductive sheets 127 is... The folded conductive sheet 127 is electrically connected to the first detection lamp 128, and the other folded conductive sheet 127 is electrically connected to an external power source. The conductive rod 122 is fixedly inserted into the end side wall of the T-shaped rod 120 near the positioning seat 103. The conductive rod 122 is used for electrical connection between the two folded conductive sheets 127. The sliding seat 101 is fixedly connected to the bottom of the positioning seat 103 and can move linearly along the top of the detection table 100. The top of the detection table 100 is fixedly connected to a first translation drive 102 that drives the sliding seat 101 to move horizontally. When the first translation drive 102 pushes the sliding seat 101 to move along the slide rail on the detection table 100, it drives the positioning seat 103 to move towards the first detection mechanism, so that the horizontal bolt can contact and press against the end face of the first translation drive 102. Since the positioning seat 103 is controlled by the first translation drive 102 to move a fixed distance each time, the length by which the positioning seat 103 pushes the T-shaped rod 120 to move when it moves to the preset position is affected by the bolt length. When the positioning seat 103 moves to the preset position, if the bolt pushes the T-shaped rod 120 to the position where the conductive rod 122 contacts the bent conductive sheet 127, the conductive rod 122 will be able to move towards the preset position. The pole 122 connects the two bent conductive plates 127, allowing the first detection light 128 to be connected to the power supply and illuminate. At this time, the length of the surface bolt meets the design requirements. When the position of the conductive pole 122 does not exceed or exceeds the position of the bent conductive plate 127, the two bent conductive plates 127 are in a disconnected state, and the first detection light 128 cannot light up. In this case, the length of the front bolt is unqualified. Furthermore, the length of the bolt is determined by whether the first detection light 128 lights up and then goes out or remains off, which facilitates classification and sorting for subsequent rework.

[0031] Furthermore, a positioning baffle 123 is provided on the side of the support plate 119 away from the positioning seat 103, which is inserted into the T-shaped rod 120. A U-shaped conductive sheet 124 is fixedly embedded on the side of the positioning baffle 123 near the support plate 119. A vertically movable extrusion plate 126 is movably inserted into the inner cavity of the positioning baffle 123. A knob screw 125 is threaded into the top of the positioning baffle 123. The bottom end of the knob screw 125 extends downward and is rotatably connected to the top of the extrusion plate 126. A straight groove is opened at the top of the T-shaped rod 120. The cross-section of the straight groove and the cross-section of the extrusion plate 126 are both trapezoidal. Since the axial position of the positioning baffle 123 on the T-shaped rod 120 can be adjusted, the distance between the positioning baffle 123 and the conductive rod 122 on the T-shaped rod 120 can be adjusted according to the required bolt length. Combined with the elastic thrust provided by the first spring 121, the positioning baffle 123 is pressed tightly against the side wall of the support plate 119, thereby achieving adjustment of the detection length. During this process, the trapezoidal cross-section between the extrusion plate 126 and the straight groove increases the contact area between them, causing the knob screw 125 to rotate and drive the extrusion plate 126... When the 6-axis moves downward to compress the inner wall of the straight groove, it can provide a more stable compressive force, enhancing the stability of the positioning baffle 123 locked on the T-shaped rod 120. In addition, the bent conductive sheet 127 penetrates the side wall of the support plate 119 and contacts the U-shaped conductive sheet 124 on the side wall of the positioning baffle 123, so that the first detection lamp 128 is kept lit in the initial state, thereby avoiding the need to re-check whether the first detection lamp 128 can work normally during the test, and also checking whether the first spring 121 can perform elastic expansion and contraction normally, ensuring the normal operation of the test.

[0032] Example 3: Based on Example 2, the second detection mechanism is further described, including an external threaded tube 114. The external threaded tube 114 is horizontally arranged at the top of one side of the lifting plate 107. A second detection lamp 116 is fixedly connected to the end of the external threaded tube 114 away from the lifting plate 107. A position switch 117 extending into the inner cavity of the external threaded tube 114 is fixedly connected to one side of the second detection lamp 116. A telescopic rod 115 is movably inserted into the end of the external threaded tube 114 near the lifting plate 107. A second spring 118 is fixedly connected between the telescopic rod 115 and the inner cavity of the external threaded tube 114. An eccentric protrusion 111 is provided at the top of the lifting plate 107. During the rotation of the lifting plate 107, the eccentric protrusion 111 at its top rotates concentrically, causing the eccentric protrusion 111 to push the telescopic rod 115 to translate. The distance the pushing block 105 translates is proportional to the rotation angle of the lifting plate 107. Therefore, the distance the pushing block 105 moves can be determined by the distance the eccentric protrusion 111 pushes the telescopic rod 115. When the pushing block 105 presses against the bolt head, the eccentric protrusion 111 pushes the telescopic rod 115 horizontally to the corresponding proportional length. If the thickness of the bolt head meets the standard, this... When the end of the telescopic rod 115 presses against the positioning switch 117, it illuminates, and the bolt is positioned stably. However, when the bolt head thickness is large, the telescopic rod 115 cannot contact the positioning switch 117, preventing the second detection light 116 from illuminating. When the bolt head thickness is small, the telescopic rod 115 cannot move further after pressing against the positioning switch 117, preventing the eccentric protrusion 111 from rotating. Consequently, the push block 105 cannot continue to press against the bolt head position, making the bolt unstable. This allows for the detection of whether the bolt head thickness meets the standard during the bolt positioning process.

[0033] Furthermore, a fixing plate 112 is fixedly connected to the bottom of the positioning seat 103. The fixing plate 112 is provided with an adjustment mechanism, which is used to adjust the horizontal distance between the external threaded tube 114 and the lifting plate 107. The adjustment mechanism includes a nut seat 113, which is fixedly inserted into the bottom of the fixing plate 112. The outer wall of the external threaded tube 114 is provided with external threads, and the external threaded tube 114 is threadedly connected to the inner wall of the nut seat 113 through the external threads. In specific use, since the fixing plate 112 is connected to the external threaded tube 114 through the nut seat 113 and the two are connected by a threaded connection, the length of the initial distance eccentric protrusion 111 can be adjusted by rotating the external threaded tube 114 clockwise or counterclockwise. In this way, the movable distance of the telescopic rod 115 can be pre-adjusted according to the thickness of the bolt head to be detected, thereby enhancing the adaptability to bolt head thickness detection.

[0034] A bolt detection method, implementing a bolt detection device as described in the above and embodiments, includes the following steps: S1. The bolt is vertically inserted into the positioning slot 104 and penetrates the bottom of the positioning seat 103. The push block 105 moves to press against the bolt head and drives the lifting plate 107 to rotate, so that the lifting plate 107 pushes the bolt from the vertical position to the horizontal position. In this way, the push block 105 can press the end face of the bolt head to maintain the horizontal positioning of the bolt. S2. While pushing the bolt head end face, the lifting plate 107 rotates at the corresponding angle. The lifting plate 107 pushes the telescopic rod 115 into the external threaded tube 114 through the eccentric protrusion 111 at its head position until the telescopic rod 115 just touches the position switch 117 and closes, causing the second detection light 116 to light up, which indicates that the bolt head thickness is qualified. S3. The positioning seat 103 moves to move the bolt end face to press the T-shaped rod 120, so that the position of the conductive rod 122 on the T-shaped rod 120 moves to the position of the bent conductive piece 127, so that the two bent conductive pieces 127 are coupled and connected. At this time, the first detection light 128 is powered on and lit up, indicating that the bolt length detection is qualified.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bolt detection device, characterized in that, include: Testing station (100); The bolt positioning mechanism includes a positioning seat (103), the end of the positioning seat (103) is provided with a positioning slot (104), the inner wall end face of the positioning slot (104) is movably provided with a push block (105) that moves and compresses the bolt in the horizontal direction, and the bottom end of the positioning seat (103) is provided with a correction mechanism for correcting the bolt position. The first testing mechanism is located on the top of the testing table (100) near the positioning slot (104) to test the length of the bolt thread; The second testing mechanism is located at the bottom of the positioning seat (103) and is used to test the thickness of the bolt head.

2. The bolt detection device according to claim 1, characterized in that, An L-shaped through hole is opened in the middle of the positioning slot (104) so ​​that the bottom end and side wall of the positioning slot (104) are connected to the outside. A second translation drive (106) for driving the push block (105) to translate is fixedly connected to the side of the positioning seat (103) away from the positioning slot (104).

3. The bolt detection device according to claim 2, characterized in that, The correction mechanism includes: The lifting plate (107) is rotatably connected to the bottom of the positioning seat (103) at its top. A straight groove (110) is provided on the side of the lifting plate (107) facing the straight groove (110). A connecting plate (108) is fixedly connected to the bottom of a push block (105) through a positioning slot (104) at its top. The bottom of the connecting plate (108) extends to the bottom of the positioning seat (103) and is rotatably connected to a T-shaped slider (109). The end of the T-shaped slider (109) is movably inserted into the inner cavity of a straight slide groove (110).

4. The bolt detection device according to claim 1, characterized in that, The first testing institution includes: Support plate (119) is fixedly connected to one side of the top of the testing table (100). A T-shaped rod (120) is slidably inserted into the top of the linear slide groove (110) through a sliding hole. A first spring (121) is fixedly connected between the T-shaped rod (120) and the support plate (119). The first detection lamp (128) is fixedly connected to the top of the support plate (119). The inner cavity of the support plate (119) and the inner wall positions on both sides of the sliding hole are fixedly connected to bent conductive sheets (127). One of the bent conductive sheets (127) is electrically connected to the first detection lamp (128), and the other bent conductive sheet (127) is electrically connected to an external power source. A conductive rod (122) is fixedly inserted into the end side wall of the T-shaped rod (120) near the positioning seat (103). The conductive rod (122) is used for electrical connection between two bent conductive sheets (127). The sliding seat (101) is fixedly connected to the bottom end of the positioning seat (103) and can move linearly along the top end of the detection table (100). The top end of the detection table (100) is fixedly connected to a first translation drive (102) that drives the sliding seat (101) to move horizontally.

5. The bolt detection device according to claim 4, characterized in that, The support plate (119) is provided with a positioning baffle (123) that is inserted into the T-shaped rod (120) on the side away from the positioning seat (103). A U-shaped conductive sheet (124) is fixedly embedded on the side of the positioning baffle (123) close to the support plate (119).

6. The bolt detection device according to claim 5, characterized in that, The positioning baffle (123) has a vertically movable extrusion plate (126) movably inserted into its inner cavity. A knob screw (125) is threaded into the top of the positioning baffle (123). The bottom end of the knob screw (125) extends downward and is rotatably connected to the top of the extrusion plate (126). A straight groove is provided at the top of the T-shaped rod (120). The cross-section of the straight groove and the cross-section of the extrusion plate (126) are both trapezoidal.

7. The bolt detection device according to claim 3, characterized in that, The second testing institution includes: The external threaded tube (114) is horizontally positioned at the top of one side of the lifting plate (107). A second detection lamp (116) is fixedly connected to one end of the external threaded tube (114) away from the lifting plate (107). A position switch (117) extending into the inner cavity of the external threaded tube (114) is fixedly connected to one side of the second detection lamp (116). Telescopic rod (115), the telescopic rod (115) is movably inserted into one end of the external threaded tube (114) near the lifting plate (107), a second spring (118) is fixedly connected between the telescopic rod (115) and the inner cavity of the external threaded tube (114), and an eccentric protrusion (111) is provided on the top of the lifting plate (107).

8. The bolt detection device according to claim 7, characterized in that, The bottom end of the positioning seat (103) is fixedly connected to a fixing plate (112), and the fixing plate (112) is provided with an adjustment mechanism. The adjustment mechanism is used to adjust the horizontal distance between the external threaded pipe (114) and the lifting plate (107).

9. The bolt detection device according to claim 8, characterized in that, The adjustment mechanism includes a nut seat (113), which is fixedly inserted into the bottom of the fixing plate (112). The outer wall of the external threaded tube (114) is provided with an external thread, and the external threaded tube (114) is threadedly connected to the inner wall of the nut seat (113) through the external thread.

10. A bolt inspection method, implemented as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. The bolt is vertically inserted into the positioning slot (104) and penetrates the bottom of the positioning seat (103). The push block (105) moves to press against the bolt head while driving the lifting plate (107) to rotate, so that the lifting plate (107) pushes the bolt from the vertical position to the horizontal position. In this way, the push block (105) can squeeze the end face of the bolt head and keep the bolt horizontally positioned. S2. When the push block (105) abuts against the end face of the bolt head, it drives the lifting plate (107) to rotate at the corresponding angle. The lifting plate (107) pushes the telescopic rod (115) into the external threaded pipe (114) through the eccentric protrusion (111) at its head position until the telescopic rod (115) just abuts against the position switch (117) and closes, causing the second detection light (116) to light up, which indicates that the bolt head thickness is qualified. S3. The positioning seat (103) moves and drives the bolt end face to press the T-shaped rod (120) to move, so that the position of the conductive rod (122) on the T-shaped rod (120) moves to the position of the bent conductive piece (127), so that the two bent conductive pieces (127) are coupled and connected. At this time, the first detection light (128) is powered on and lit up, indicating that the bolt length detection is qualified.

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