Multi-specification automatic thread detection machine

Abstract

The present invention relates to the field of thread detection technology, and discloses a multi-specification automatic thread detection machine, wherein a plurality of groups of positioning platform components for positioning and installing product workpieces are evenly spaced at the upper end of a turntable, and the turntable is used to drive the positioning platform components to move; a detection component is provided on the mobile adjustment component, and the mobile adjustment component is used to adjust the position of the detection component so that the thread detection head on the detection component is directly facing the top of the bolt on the product workpiece, and after the pre-pressing mechanism presses and fixes the product workpiece, the thread detection head performs thread detection on the bolt. The turntable of the present invention is used to drive the positioning platform component to move, so that the detection component of the next station can perform thread detection on the bolt again; the mobile adjustment component is used to adjust the position of the detection component, which is conducive to ensuring that the thread detection head is accurately screwed with the bolt to ensure the accuracy of the detection; the pre-pressing mechanism can press and fix the product workpiece to prevent the position of the product workpiece from shifting, thereby ensuring the accuracy of the detection.

Description

Technical Field

[0001] The invention relates to the technical field of thread detection, in particular to a multi-specification automatic thread detection machine. Background Art

[0002] A workpiece is often connected to another workpiece by a bolt that is integrally formed with it and then a nut is used to fix the workpieces to each other. If the thread size or shape of the bolt is not processed properly, the nut cannot be accurately screwed to the bolt. Therefore, the bolts on the workpiece need to be quality inspected before leaving the factory. Usually, a go gauge and a stop gauge are used to detect the external thread of the bolt. Multiple manual inspections will waste work time, resulting in low thread inspection efficiency of the workpiece, and the workpiece to be inspected cannot be fixed, which will affect the coordination of the go gauge, the stop gauge and the bolt on the workpiece, resulting in poor inspection accuracy. For this reason, we have launched a multi-specification automatic thread inspection machine. Summary of the invention

[0003] The object of the present invention is to provide a multi-specification automatic thread detection machine to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A multi-specification automatic thread inspection machine comprises an inspection frame, a turntable is provided at the middle of the upper end of the inspection frame, a plurality of positioning table assemblies for positioning and installing product workpieces are arranged at equal intervals at the upper end of the turntable, and the turntable is used to drive the positioning table assemblies to move positions;

[0006] The upper end of the detection frame is provided with a plurality of groups of movable adjustment components located outside the turntable at equal intervals, and a detection component is provided on the movable adjustment component. The movable adjustment component is used to adjust the position of the detection component so that the thread detection head on the detection component is directly opposite to the top of the bolt on the product workpiece. Subsequently, after the pre-pressing mechanism on the detection component presses and fixes the product workpiece, the thread detection head performs thread detection on the bolt.

[0007] Preferably, a protective frame is provided on the outer side of the upper end of the detection frame.

[0008] Preferably, a driving motor is installed in the middle of the lower end of the detection frame, and the output end of the driving motor passes through the detection frame and is fixedly connected to the middle of the lower end of the turntable.

[0009] Preferably, the positioning platform assembly includes a positioning seat installed at the upper end of the turntable and two sets of limit blocks, a first positioning pin, a second positioning pin and a third positioning pin fixed at the upper end of the positioning seat;

[0010] The two sets of limit blocks are used to clamp on both sides of the product workpiece, the second positioning pin is used to insert into the positioning hole on the product workpiece, the first positioning pin is clamped on the outer wall of the product workpiece, and the third positioning pin is clamped in the slot on the product workpiece to achieve positioning limitation on the horizontal displacement of the product workpiece.

[0011] Preferably, the heights of the limit block, the first positioning pin, the second positioning pin and the third positioning pin are all lower than the height of the product workpiece.

[0012] Preferably, the mobile adjustment assembly includes a bracket installed on the upper end of the detection frame, a horizontal frame installed on the top of the bracket, a first motor fixed at one end of the horizontal frame by a first mounting frame, a mobile frame slidably connected to the side of the horizontal frame, a second motor fixed on the mobile frame, a vertical guide rail slidably connected to the mobile frame, a box body fixed at the bottom of the vertical guide rail, a sliding seat slidably connected inside the box body, and an electric telescopic cylinder fixed at one end of the box body;

[0013] The output end of the first motor is connected to a first pulley, a second pulley is provided in a second mounting frame at the other end of the horizontal frame, and a first belt is connected between the first pulley and the second pulley;

[0014] A horizontal guide rail is fixed on the side of the horizontal frame, a first slide is installed on the side of the mobile frame through a third mounting frame, the first slide is slidably connected to the horizontal guide rail, and a first belt extends through the third mounting frame;

[0015] A second slide is installed on the other side of the moving frame, a vertical guide rail is slidably connected to the second slide, a rack is fixed on the vertical guide rail through an L-shaped frame, and the rack is meshed with a gear at the output end of the second motor;

[0016] The piston rod at the output end of the electric telescopic cylinder extends into the box body and is fixedly connected to the sliding seat, and the lower end of the sliding seat is fixed with a connecting block.

[0017] Preferably, a connecting protrusion is provided at one end of the box body, the bottom of the vertical guide rail is fixed to the top of the connecting protrusion, and the connecting block extends through a sliding groove at the bottom of the box body.

[0018] Preferably, the detection assembly includes a moving seat installed at the bottom of the connecting block, a driven shaft and a driving shaft provided through both ends of the moving seat, and a third motor installed on the side of the box body through an L-shaped fixing frame;

[0019] The top of the driven shaft passes through the moving seat and is fixed with a driven pulley, the top of the driving shaft passes through the moving seat and is fixed with a driving pulley, and the output end of the third motor is connected to the top of the driving shaft, and a second belt is connected between the driven pulley and the driving pulley.

[0020] Preferably, the thread detection head is a thread stop gauge or a thread through gauge respectively fixed to the bottom of the driven shaft and the driving shaft.

[0021] Preferably, the pre-stressing mechanism includes a boss fixed on the side of the movable seat, a light rod passing through the boss, a limit plate connected to the top of the light rod after extending out of the boss, a pressure plate connected to the bottom of the light rod after extending out of the boss, and a spring sleeved on the light rod, and both ends of the spring are clamped between the top of the pressure plate and the bottom of the boss.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the turntable of the present invention is used to drive the positioning table assembly to move its position, so that the detection assembly of the next workstation can perform another thread detection on the bolt, which can increase the number of detections and further improve the detection accuracy; the mobile adjustment assembly is used to adjust the position of the detection assembly, so that the thread detection head on the detection assembly is directly opposite to the top of the bolt on the product workpiece, which is conducive to ensuring that the thread detection head is accurately screwed with the bolt, thereby ensuring the accuracy of the detection; the positioning table assembly realizes the positioning limitation of the horizontal displacement of the product workpiece, and after the pre-pressing mechanism on the detection assembly presses and fixes the product workpiece, the thread detection head performs thread detection on the bolt, which can achieve the fixation of the product workpiece position, prevent the product workpiece position from shifting, and ensure the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the product workpiece and the positioning platform assembly after installation of the present invention;

[0025] Figure 3 A schematic diagram of a three-dimensional structure of the connection between the movable adjustment component and the detection component of the present invention;

[0026] Figure 4 For the present invention Figure 3 Schematic diagram of the three-dimensional structure under the second viewing angle;

[0027] Figure 5 For the present invention Figure 3 Schematic diagram of the three-dimensional structure from the third perspective;

[0028] Figure 6 This is a schematic diagram of the three-dimensional structure of the connection between the detection component and the box body of the present invention;

[0029] Figure 7 For the present invention Figure 6 Schematic diagram of the three-dimensional structure under the second viewing angle;

[0030] Figure 8 For the present invention Figure 6 Schematic diagram of the three-dimensional structure from the third perspective.

[0031] In the figure: 1, detection frame; 2, driving motor; 3, turntable; 4, positioning table assembly; 41, positioning seat; 42, limit block; 43, first positioning pin; 44, second positioning pin; 45, third positioning pin; 5, mobile adjustment assembly; 51, bracket; 52, first pulley; 53, horizontal frame; 54, first mounting frame; 55, first motor; 56, second motor; 57, first slide seat; 58, rack; 59, vertical guide rail; 60, box; 61, sliding seat; 62, electric telescopic cylinder; 63, mobile frame; 64, second mounting frame; 65, horizontal guide rail; 66, first belt; 67, second pulley; 68. Second slide seat; 69. L-shaped frame; 70. Gear; 71. Piston rod; 72. Third mounting frame; 73. Slide groove; 74. Connecting block; 75. Connecting protrusion; 6. Product workpiece; 601. Bolt; 602. Slot; 7. Detection assembly; 701. Moving seat; 702. Driving shaft; 703. Threaded detection head; 704. Press plate; 705. Spring; 706. Second belt; 707. Driven shaft; 708. Optical rod; 709. L-shaped fixing frame; 710. Third motor; 711. Driven pulley; 712. Driving pulley; 713. Limiting plate; 714. Boss; 8. Protective frame. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0033] Example:

[0034] See also Figure 1-8 , the present invention provides a technical solution:

[0035] A multi-specification automatic thread inspection machine includes an inspection frame 1, a turntable 3 is provided in the middle of the upper end of the inspection frame 1, a plurality of groups of movable adjustment components 5 are evenly spaced at the upper end of the inspection frame 1 and are located outside the turntable 3, and a protective frame 8 is provided outside the upper end of the inspection frame 1. The protective frame 8 is used to protect the turntable 3 and the movable adjustment components 5.

[0036] The moving and adjusting assembly 5 includes a bracket 51 installed at the upper end of the detection frame 1, a horizontal frame 53 installed on the top of the bracket 51, a first motor 55 fixed at one end of the horizontal frame 53 through a first mounting frame 54, a moving frame 63 slidingly connected to the side of the horizontal frame 53, a second motor 56 fixed on the moving frame 63, a vertical guide rail 59 slidingly connected to the moving frame 63, a box 60 fixed at the bottom of the vertical guide rail 59, a sliding seat 61 slidingly connected inside the box 60, and an electric telescopic cylinder 62 fixed at one end of the box 60;

[0037] The output end of the first motor 55 is connected to the first pulley 52, and the second mounting frame 64 at the other end of the horizontal frame 53 is provided with a second pulley 67, and a first belt 66 is connected between the first pulley 52 and the second pulley 67;

[0038] A horizontal guide rail 65 is fixed to the side of the horizontal frame 53, and a first slide 57 is installed on the side of the mobile frame 63 through a third mounting frame 72. The first slide 57 is slidably connected to the horizontal guide rail 65, and a first belt 66 extends through the third mounting frame 72;

[0039] A second slide 68 is installed on the other side of the moving frame 63, and the vertical guide rail 59 is slidably connected to the second slide 68. A rack 58 is fixed on the vertical guide rail 59 through an L-shaped frame 69, and the rack 58 is meshed with a gear 70 at the output end of the second motor 56;

[0040] The first motor 55 is controlled by a PLC controller, and the model of the first motor 55 is SE-MN series, SGMAH series, 8C series, SMC series or other models that meet the use requirements.

[0041] The first motor 55 drives the first belt 66 to rotate through the first pulley 52, so that the first belt 66 drives the first slide 57 to move in the horizontal direction (i.e., the X-axis direction) along the horizontal guide rail 65, thereby realizing the movement of the detection component 7 in the X-axis direction;

[0042] The second motor 56 is controlled by a PLC controller, and the model of the second motor 56 is SE-MN series, SGMAH series, 8C series, SMC series or other models that meet the use requirements.

[0043] The second motor 56 drives the gear 70 to rotate, and through the meshing of the gear 70 and the rack 58, the rack 58 drives the vertical guide rail 59 to move along the second slide 68 in the up and down direction (i.e., the Z-axis direction), thereby realizing the movement of the detection component 7 in the Z-axis direction;

[0044] The piston rod 71 at the output end of the electric telescopic cylinder 62 extends into the box body 60 and is fixedly connected to the sliding seat 61. The lower end of the sliding seat 61 is fixed with a connecting block 74;

[0045] A connecting protrusion 75 is provided at one end of the box body 60 , the bottom of the vertical guide rail 59 is fixed to the top of the connecting protrusion 75 , and the connecting block 74 extends through the slide groove 73 at the bottom of the box body 60 .

[0046] The model of the electric telescopic cylinder 62 is a CSD series electric cylinder or other models that meet the use requirements. The piston rod 71 of the electric telescopic cylinder 62 drives the sliding seat 61 to move in the box body 60, so as to realize the movement of the detection component 7 in the Y-axis direction; until the thread detection head 703 of the detection component 7 is moved to the top of the corresponding bolt 601.

[0047] A driving motor 2 is installed at the middle of the lower end of the detection frame 1, and the output end of the driving motor 2 passes through the detection frame 1 and is fixedly connected to the middle of the lower end of the turntable 3. The driving motor 2 is controlled by a PLC controller, and the driving motor 2 is a servo motor, and its model is SE-MN series, SGMAH series, 8C series, SMC series or other models that meet the use requirements.

[0048] Several groups of positioning platform components 4 for positioning and installing product workpieces 6 are arranged at equal intervals on the upper end of the turntable 3. The turntable 3 is used to drive the positioning platform components 4 to move;

[0049] The PLC controller controls the driving motor 2 to operate, so that the turntable 3 rotates until the product workpiece 6 on the positioning table assembly 4 is moved to the next station.

[0050] The positioning platform assembly 4 includes a positioning seat 41 installed on the upper end of the turntable 3, two sets of limit blocks 42 fixed on the upper end of the positioning seat 41, a first positioning pin 43, a second positioning pin 44 and a third positioning pin 45;

[0051] The two sets of limit blocks 42 are used to clamp on both sides of the product workpiece 6, the second positioning pin 44 is used to be inserted into the positioning hole on the product workpiece 6, the first positioning pin 43 is clamped on the outer wall of the product workpiece 6, and the third positioning pin 45 is clamped in the slot 602 on the product workpiece 6, so as to realize the positioning limit of the horizontal displacement of the product workpiece 6.

[0052] The heights of the limit block 42, the first positioning pin 43, the second positioning pin 44 and the third positioning pin 45 are all lower than the height of the product workpiece 6. In this way, the pressing plate 704 can be pressed against the upper surface of the product workpiece 6 in the future. After the product workpiece 6 is pressed and fixed, when the thread detection head 703 performs thread detection on the bolt 601, the product workpiece 6 will not shake.

[0053] Due to the different models and specifications of the product workpiece 6, when in use, positioning table assemblies 4 of different models and specifications are required to fix the product workpiece 6. The corresponding positioning table assembly 4 can be replaced according to the different product workpieces 6 to achieve the fixation of product workpieces 6 of various specifications.

[0054] A detection component 7 is provided on the movable adjustment component 5, and the movable adjustment component 5 is used to adjust the position of the detection component 7 so that the thread detection head 703 on the detection component 7 is directly opposite to the top of the bolt 601 on the product workpiece 6. Then, after the pre-pressing mechanism on the detection component 7 presses and fixes the product workpiece 6, the thread detection head 703 performs thread detection on the bolt 601.

[0055] The detection assembly 7 includes a moving seat 701 installed at the bottom of the connecting block 74, a driven shaft 707 and a driving shaft 702 penetrating through both ends of the moving seat 701, and a third motor 710 installed on the side of the box body 60 through an L-shaped fixing bracket 709;

[0056] The top of the driven shaft 707 passes through the moving seat 701 and a driven pulley 711 is fixed thereon. The top of the driving shaft 702 passes through the moving seat 701 and a driving pulley 712 is fixed thereon. The output end of the third motor 710 is connected to the top of the driving shaft 702 , and a second belt 706 is connected between the driven pulley 711 and the driving pulley 712 .

[0057] The thread detection head 703 is a thread stop gauge or a thread through gauge fixed at the bottom of the driven shaft 707 and the driving shaft 702 respectively. Both are cylindrical in shape, and the inner wall of the cylinder is provided with internal threads.

[0058] The thread stop gauge is screwed onto the outer side of the corresponding bolt 601. When in use, if the thread stop gauge cannot pass through the external thread of the bolt 601 (the general standard is that the thread stop gauge cannot be screwed into the external thread of the bolt 601 for 2.5 turns or more), it means that the size of the external thread of the bolt 601 is qualified.

[0059] The thread gauge is screwed onto the outer side of the corresponding bolt 601. When in use, if the thread gauge can be completely screwed onto the outer side of the bolt 601, it means that the size of the external thread of the bolt 601 is qualified. If the thread gauge cannot be completely screwed onto the outer side of the bolt 601, it means that the size of the external thread of the bolt 601 is unqualified.

[0060] The third motor 710 is controlled by a PLC controller, and the model of the third motor 710 is SE-MN series, SGMAH series, 8C series, SMC series or other models that meet the use requirements.

[0061] The third motor 710 drives the driven shaft 707 and the driving shaft 702 to rotate synchronously and at the same speed through the second belt 706, so that the two groups of thread detection heads 703 rotate synchronously and at the same speed. When the second motor 56 drives the gear 70 to rotate, the rack 58 drives the vertical guide rail 59 to move downward along the second slide seat 68, so that the thread detection head 703 on the detection assembly 7 gradually moves downward until the thread detection head 703 is threadedly connected with the corresponding bolt 601.

[0062] The pre-pressing mechanism includes a boss 714 fixed on the side of the movable seat 701, a light rod 708 passing through the boss 714, a limit plate 713 connected to the top of the light rod 708 after extending out of the boss 714, a pressure plate 704 connected to the bottom of the light rod 708 after extending out of the boss 714, and a spring 705 sleeved on the light rod 708, and both ends of the spring 705 are clamped between the top of the pressure plate 704 and the bottom of the boss 714.

[0063] When the detection assembly 7 moves downward as a whole, the pressure plate 704 is pressed against the upper end surface of the product workpiece 6 to fix the product workpiece 6, and as the thread detection head 703 gradually descends, the thread detection head 703 is gradually threaded with the corresponding bolt 601. At this time, the light rod 708 on the pressure plate 704 moves upward relative to the moving seat 701, so that the spring 705 is gradually in a compressed state, and under the elastic force of the spring 705 on the pressure plate 704, it can ensure that the pressure plate 704 is pressed against the upper end surface of the product workpiece 6.

[0064] After the detection is completed, the second motor 56 drives the gear 70 to rotate, so that the rack 58 drives the vertical guide rail 59 to move upward along the second slide 68, so that the detection assembly 7 moves up and resets. At the same time, after the pressure plate 704 is out of contact with the product workpiece 6, the spring 705 exerts an elastic force on the pressure plate 704, so that the optical rod 708 moves downward relative to the moving seat 701, thereby realizing the reset of the pressure plate 704.

[0065] Specifically, when in use, the product workpiece 6 is placed on the positioning platform assembly 4, so that the two sets of limit blocks 42 are clamped on both sides of the product workpiece 6, the second positioning pin 44 is inserted into the positioning hole on the product workpiece 6, the first positioning pin 43 is clamped on the outer wall of the product workpiece 6, and the third positioning pin 45 is clamped in the slot 602 on the product workpiece 6, so as to realize the positioning restriction of the horizontal displacement of the product workpiece 6 (such as Figure 2 status shown);

[0066] Then the PLC controller controls the first motor 55, the second motor 56, the electric telescopic cylinder 62 and the third motor 710 to work;

[0067] The first motor 55 works to realize the movement of the detection component 7 in the X-axis direction, the second motor 56 works to realize the movement of the detection component 7 in the Z-axis direction, and the electric telescopic cylinder 62 works to realize the movement of the detection component 7 in the Y-axis direction until the threaded detection head 703 of the detection component 7 is moved to the top of the corresponding bolt 601;

[0068] The third motor 710 works to realize synchronous and same-speed rotation of the two sets of thread detection heads 703;

[0069] Then, the detection assembly 7 is controlled to move downward as a whole, and the pressing plate 704 is pressed against the upper end surface of the product workpiece 6 to fix the product workpiece 6, and as the thread detection head 703 gradually descends, the thread detection head 703 is also gradually screwed with the corresponding bolt 601;

[0070] After the detection is completed, the second motor 56 drives the gear 70 to rotate, so that the rack 58 drives the vertical guide rail 59 to move upward along the second slide 68, so that the detection assembly 7 moves up and resets. At the same time, after the pressing plate 704 is out of contact with the product workpiece 6, the spring 705 exerts an elastic force on the pressing plate 704, so that the light rod 708 moves downward relative to the moving seat 701, so that the pressing plate 704 is reset;

[0071] Then, the PLC controller controls the drive motor 2 to operate, causing the turntable 3 to rotate until the product workpiece 6 on the positioning table assembly 4 is moved to the next station, and then the above steps are repeated so that the detection assembly 7 of the next station is moved to a position, and the thread detection head 703 is screwed with the corresponding bolt 601 for another thread detection.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-specification automatic thread inspection machine, comprising a detection frame, characterized in that: A turntable is provided in the middle of the upper end of the detection frame, and a plurality of groups of positioning table components for positioning and installing product workpieces are arranged at equal intervals on the upper end of the turntable, and the turntable is used to drive the positioning table components to move positions; The upper end of the detection frame is provided with a plurality of groups of movable adjustment components located outside the turntable at equal intervals, and a detection component is provided on the movable adjustment component. The movable adjustment component is used to adjust the position of the detection component so that the thread detection head on the detection component is directly opposite to the top of the bolt on the product workpiece. Subsequently, after the pre-pressing mechanism on the detection component presses and fixes the product workpiece, the thread detection head performs thread detection on the bolt.

2. The multi-specification automatic thread detection machine according to claim 1, characterized in that: A protective frame is arranged on the outer side of the upper end of the detection frame.

3. The multi-specification automatic thread detection machine according to claim 1, characterized in that: A driving motor is installed at the middle part of the lower end of the detection frame, and the output end of the driving motor passes through the detection frame and is fixedly connected to the middle part of the lower end of the turntable.

4. The multi-specification automatic thread detection machine according to claim 1, characterized in that: The positioning platform assembly includes a positioning seat installed on the upper end of the turntable, and two groups of limit blocks, a first positioning pin, a second positioning pin and a third positioning pin fixed on the upper end of the positioning seat; The two sets of limit blocks are used to clamp on both sides of the product workpiece, the second positioning pin is used to insert into the positioning hole on the product workpiece, the first positioning pin is clamped on the outer wall of the product workpiece, and the third positioning pin is clamped in the slot on the product workpiece to achieve positioning limitation on the horizontal displacement of the product workpiece.

5. The multi-specification automatic thread detection machine according to claim 4, characterized in that: The heights of the limit block, the first positioning pin, the second positioning pin and the third positioning pin are all lower than the height of the product workpiece.

6. The multi-specification automatic thread detection machine according to claim 1, characterized in that: The movable adjustment assembly includes a bracket installed at the upper end of the detection frame, a horizontal frame installed on the top of the bracket, a first motor fixed at one end of the horizontal frame by a first mounting frame, a mobile frame slidably connected to the side of the horizontal frame, a second motor fixed on the mobile frame, a vertical guide rail slidably connected to the mobile frame, a box body fixed at the bottom of the vertical guide rail, a sliding seat slidably connected inside the box body, and an electric telescopic cylinder fixed at one end of the box body; The output end of the first motor is connected to a first pulley, a second pulley is provided in a second mounting frame at the other end of the horizontal frame, and a first belt is connected between the first pulley and the second pulley; A horizontal guide rail is fixed on the side of the horizontal frame, a first slide is installed on the side of the mobile frame through a third mounting frame, the first slide is slidably connected to the horizontal guide rail, and a first belt extends through the third mounting frame; A second slide is installed on the other side of the moving frame, a vertical guide rail is slidably connected to the second slide, a rack is fixed on the vertical guide rail through an L-shaped frame, and the rack is meshed with a gear at the output end of the second motor; The piston rod at the output end of the electric telescopic cylinder extends into the box body and is fixedly connected to the sliding seat, and the lower end of the sliding seat is fixed with a connecting block.

7. The multi-specification automatic thread detection machine according to claim 6, characterized in that: A connecting protrusion is arranged at one end of the box body, the bottom of the vertical guide rail is fixed to the top of the connecting protrusion, and the connecting block extends through the sliding groove at the bottom of the box body.

8. The multi-specification automatic thread detection machine according to claim 6, characterized in that: The detection assembly includes a moving seat installed at the bottom of the connecting block, a driven shaft and a driving shaft arranged through both ends of the moving seat, and a third motor installed on the side of the box through an L-shaped fixing frame; The top of the driven shaft passes through the moving seat and is fixed with a driven pulley, the top of the driving shaft passes through the moving seat and is fixed with a driving pulley, and the output end of the third motor is connected to the top of the driving shaft, and a second belt is connected between the driven pulley and the driving pulley.

9. The multi-specification automatic thread detection machine according to claim 8, characterized in that: The thread detection head is a thread stop gauge or a thread through gauge respectively fixed on the bottom of the driven shaft and the driving shaft.

10. The multi-specification automatic thread detection machine according to claim 6, characterized in that: The pre-pressing mechanism includes a convex seat fixed on the side of the moving seat, a polished rod passing through the convex seat, a limit plate connected to the top of the polished rod after extending out of the convex seat, a pressure plate connected to the bottom of the polished rod after extending out of the convex seat, and a spring sleeved on the polished rod, and both ends of the spring are clamped between the top of the pressure plate and the bottom of the convex seat.

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