Multifunctional inspection device for steel structure production
By designing a multi-functional inspection device, using components such as inspection bench, motor, bidirectional threaded rod and hydraulic cylinder, the problems of low inspection efficiency and low accuracy in the existing technology are solved, and multi-faceted inspection of steel structures is realized and improved. The practicality and accuracy of the test.
Patent Information
- Application Number
- CN202420899278.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-04-26
Smart Images
Figure CN222318704U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steel structure inspection devices, in particular to a multifunctional inspection device for steel structure production. Background Art
[0002] Steel structure is a structure made of steel materials and is one of the main types of building structures. The structure is mainly composed of steel beams, steel columns, steel trusses and other components made of steel sections and steel plates. The components or parts are usually connected by welds, bolts or rivets.
[0003] Steel structures need to undergo multiple inspections before use and can only be used after passing the inspections. Most existing inspection devices can only inspect one side, with low inspection efficiency. At the same time, they are prone to movement during inspection, resulting in insufficient inspection accuracy and low practicality, which has brought certain adverse effects to people's use process. In order to solve the shortcomings of the existing technology, we propose a multifunctional inspection device for steel structure production. Utility Model Content
[0004] The main purpose of the utility model is to provide a multifunctional inspection device for steel structure production, which can effectively solve the problems in the background technology.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A multifunctional inspection device for steel structure production comprises an inspection platform, wherein a No. 1 motor is arranged at the right end of the inspection platform, a bidirectional threaded rod is arranged at the output end of the No. 1 motor, two No. 1 moving blocks are arranged on the outer surface of the bidirectional threaded rod, a moving base is arranged at the upper end of the No. 1 moving block, a No. 2 motor is arranged at the front end of the moving base, a No. 1 screw rod is arranged at the output end of the No. 2 motor, a No. 2 moving block is arranged on the outer surface of the No. 1 screw rod, a clamping plate is arranged on one side of the No. 2 moving block, two fixed plates are arranged at the front and rear ends of the inspection platform, a No. 3 motor is arranged on one side of the fixed plate at the front end, a No. 2 screw rod is arranged at the output end of the No. 3 motor through the fixed plate, a No. 2 screw rod is arranged at the output end of the No. 3 motor, a No. 1 fixed rod is arranged between the two fixed plates at the rear end, a No. 3 moving block is arranged on the outer surfaces of the No. 2 screw rod and the No. 1 fixed rod, a hydraulic cylinder is arranged at the upper end of the No. 3 moving block, and the output ends of the two hydraulic cylinders are arranged with the first moving plate, The lower end of the first movable plate is provided with a connecting column, the lower end of the connecting column is provided with a connecting frame, the inner surface of the upper end of the connecting frame is provided with a sensor, a plurality of No. 1 movable rods are inserted into the lower end surface of the connecting frame, the upper end of the No. 1 movable rod is provided with a contact block, the lower end of the No. 1 movable rod is provided with a roller, the outer surface of the No. 1 movable rod is provided with a first spring, and a warning light is provided at the upper end of the connecting frame; the outer surfaces of the No. 2 screw rod and the No. 1 fixed rod are both provided with movable vertical plates, one of the movable vertical plates is provided with a No. 4 motor at the top, the No. 3 screw rod is provided at the output end of the No. 4 motor, the No. 2 fixed rod is provided in the other movable vertical plate, the No. 4 movable blocks are both provided on the outer surfaces of the No. 3 screw rod and the No. 2 fixed rod, a second movable plate is provided between the two No. 4 movable blocks, the No. 2 movable rod is provided in the second movable plate, the lower end of the No. 2 movable rod is provided with a detection head, and the outer surface of the No. 2 movable rod is provided with a second spring.
[0007] Preferably, the No. 1 motor is detachably connected to the right end of the inspection table, and a coupling is provided at the output end of the No. 1 motor. The output end of the No. 1 motor is detachably connected to the bidirectional threaded rod through the provided coupling, the No. 1 moving block is threadedly connected to the outer surface of the bidirectional threaded rod, and the moving base is welded to the upper end of the No. 1 moving block.
[0008] Preferably, the No. 2 motor is detachably connected to the front end of the movable base, a coupling is provided at the output end of the No. 2 motor, the output end of the No. 2 motor is detachably connected to the No. 1 screw rod through the provided coupling, the No. 2 movable block is threadedly connected to the outer surface of the No. 1 screw rod, and the splint is welded to one side of the No. 2 movable block.
[0009] Preferably, the No. 3 motor is detachably connected to one side of the fixed plate, a coupling is provided at the output end of the No. 3 motor, the output end of the No. 3 motor passes through the fixed plate and is detachably connected to the No. 2 screw rod through the provided coupling, one of the No. 3 moving blocks is threadedly connected to the outer surface of the No. 2 screw rod, and the other No. 3 moving block is slidably connected to the outer surface of the No. 1 fixed rod.
[0010] Preferably, the hydraulic cylinder is detachably connected to the upper end of the No. 3 movable block, the first movable plate is detachably connected to the output end of the hydraulic cylinder, a connecting column is welded between the first movable plate and the connecting frame, the No. 1 movable rod is slidably connected to the connecting frame, and the sensor is electrically connected to the warning light.
[0011] Preferably, the two movable vertical plates are respectively threaded and slidably connected to the outer surfaces of the No. 2 screw rod and the No. 1 fixed rod, the No. 4 motor is detachably connected to the top of the movable vertical plate, the output end of the No. 4 motor is provided with a coupling, and the output end of the No. 4 motor is detachably connected to the No. 3 screw rod through the provided coupling, the two No. 4 movable blocks are respectively threaded and slidably connected to the outer surfaces of the No. 3 screw rod and the No. 2 fixed rod, the second movable plate is welded between the two No. 4 movable blocks, the No. 2 movable rod is slidably connected to the inside of the second movable plate, and the detection head is welded to the bottom of the No. 2 movable rod.
[0012] Beneficial Effects
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] 1. In the utility model, through the inspection table, No. 1 motor, two-way threaded rod, No. 1 moving block, moving base, No. 2 motor, No. 1 screw rod, No. 2 moving block and clamping plate, steel structures of different sizes can be conveniently clamped and fixed, so as to avoid the movement of the steel structure during the inspection process and affect the inspection result. When in use, the steel structure is placed between the two moving bases, and then the two-way threaded rod is driven to rotate by turning on the No. 1 motor. At this time, the two No. 1 moving blocks will drive the moving base to move toward the center position as the two-way threaded rod rotates, and at the same time, the left and right sides of the steel structure are clamped and fixed. After the two sides are fixed, the No. 1 screw rod is driven to rotate by turning on the No. 2 motor. At this time, the No. 2 moving block will drive the clamping plate to move as the No. 1 screw rod rotates, so as to clamp and fix the front and rear ends of the steel structure. After the clamping and fixing are completed, it can be inspected, and steel structures of different sizes can be conveniently clamped and fixed, so as to avoid the movement of the steel structure during the inspection process and affect the inspection result. The operation is convenient and fast.
[0015] 2. In the utility model, by setting a fixed plate, No. 3 motor, No. 2 screw rod, No. 1 fixed rod, No. 3 moving block, hydraulic cylinder, first moving plate, connecting column, connecting frame, sensor, No. 1 movable rod, contact block, roller, first spring and warning light, the flatness of the steel structure can be conveniently inspected, and the practicability is high. When in use, the first moving plate is driven to move by adjusting the hydraulic cylinder, and the roller will move accordingly. After adjusting to the roller being close to the surface of the steel structure, the No. 3 motor is turned on to drive the No. 2 screw rod to rotate. At this time, the No. 3 moving block will drive the hydraulic cylinder and the first moving plate to move to the left with the rotation of the No. 2 screw rod, and at the same time drive the roller to roll to the left on the surface of the steel structure. When a protrusion appears on the surface of the steel structure, the roller will be pushed upward, and the No. 1 movable rod will also be pushed upward, and at the same time push the contact block to move upward. When the contact block contacts the sensor, the sensor will receive a signal and transmit it to the warning light to light it up. When the second movable plate is moved downward, the second movable plate will move downward until the detection head contacts the surface of the steel structure, and the second movable plate will slide upward. At this time, the second spring will exert pressure on the detection head and the surface of the steel structure, thereby performing a hardness test on the steel structure. The hardness test equipment will also move to the left during the flatness test, and the second movable plate will be located above the steel structure after the flatness test is completed. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0017] Figure 2 It is a schematic diagram of the structure of the steel structure clamping device of the utility model;
[0018] Figure 3 It is a structural schematic diagram of the clamping plate moving device of the utility model;
[0019] Figure 4 It is a structural schematic diagram of the mobile device of the steel structure inspection equipment of the utility model;
[0020] Figure 5 It is a structural schematic diagram of the steel structure flatness inspection equipment of the utility model;
[0021] Figure 6 It is a structural schematic diagram of the steel structure hardness testing equipment of the utility model.
[0022] In the figure: 1. inspection table; 2. No. 1 motor; 3. bidirectional threaded rod; 4. No. 1 moving block; 5. moving base; 6. No. 2 motor; 7. No. 1 screw rod; 8. No. 2 moving block; 9. clamping plate; 10. fixed plate; 11. No. 3 motor; 12. No. 2 screw rod; 13. No. 1 fixed rod; 14. No. 3 moving block; 15. hydraulic cylinder; 16. first moving plate; 17. connecting column; 18. connecting frame; 19. sensor; 20. No. 1 movable rod; 21. contact block; 22. roller; 23. first spring; 24. warning light; 25. moving vertical plate; 26. No. 4 motor; 27. No. 3 screw rod; 28. No. 2 fixed rod; 29. No. 4 moving block; 30. second moving plate; 31. No. 2 movable rod; 32. detection head; 33. second spring. DETAILED DESCRIPTION
[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.
[0024] like Figure 1-Figure 3 As shown, a multifunctional inspection device for steel structure production includes an inspection table 1, the right end of the inspection table 1 is detachably connected to a No. 1 motor 2, the output end of the No. 1 motor 2 is detachably connected to a bidirectional threaded rod 3 through a coupling, the outer surface of the bidirectional threaded rod 3 is threadedly connected to two No. 1 moving blocks 4, the upper end of the No. 1 moving block 4 is welded with a moving base 5, the front end of the moving base 5 is detachably connected to a No. 2 motor 6, the output end of the No. 2 motor 6 is detachably connected to a No. 1 screw rod 7 through a coupling, the outer surface of the No. 1 screw rod 7 is threadedly connected to a No. 2 moving block 8, and a splint 9 is welded to one side of the No. 2 moving block 8. When in use, the steel structure is placed between the two moving blocks. The two moving blocks 4 will drive the moving base 5 to move toward the center position as the two-way threaded rod 3 rotates, and at the same time, the left and right sides of the steel structure are clamped and fixed. After the fixation of both sides is completed, the No. 2 motor 6 is turned on to drive the No. 1 screw rod 7 to rotate. At this time, the No. 2 moving block 8 will drive the clamping plate 9 to move as the No. 1 screw rod 7 rotates, and the front and rear ends of the steel structure are clamped and fixed. After the clamping and fixing are completed, it can be inspected, and steel structures of different sizes can be clamped and fixed conveniently to avoid the movement of the steel structure during the inspection process affecting the inspection results.
[0025] like Figure 1 , Figure 4 , Figure 5 , Figure 6As shown, two fixing plates 10 are welded at both ends of the inspection table 1, and a No. 3 motor 11 is detachably connected to one side of the fixing plate 10 at the front end, and the output end of the No. 3 motor 11 passes through the fixing plate 10 and is detachably connected to a No. 2 screw rod 12 through a coupling, and a No. 1 fixing rod 13 is arranged between the two fixing plates 10 at the rear end, and a No. 3 moving block 14 is respectively threadedly and slidably connected to the outer surfaces of the No. 2 screw rod 12 and the No. 1 fixing rod 13, and the upper end of the No. 3 moving block 14 is detachably connected to a hydraulic cylinder 15, and the output ends of the two hydraulic cylinders 15 are detachably connected to a first moving plate 16, and a connecting column 17 is welded to the lower end of the first moving plate 16 A connecting frame 18 is welded to the lower end of the connecting column 17, a sensor 19 is arranged on the inner surface of the upper end of the connecting frame 18, a plurality of No. 1 movable rods 20 are slidably inserted into the lower end surface of the connecting frame 18, a contact block 21 is arranged on the upper end of the No. 1 movable rod 20, a roller 22 is arranged on the lower end of the No. 1 movable rod 20, a first spring 23 is sleeved on the outer surface of the No. 1 movable rod 20, a warning light 24 is arranged on the upper end of the connecting frame 18, and the warning light 24 is electrically connected to the sensor 19, and the outer surfaces of the No. 2 screw rod 12 and the No. 1 fixed rod 13 are respectively threadedly connected and slidably connected with a movable vertical plate 25, and a No. 4 motor 26 is detachably connected to the top of one of the movable vertical plates 25, and the No. 4 motor 26 is detachably connected to the top of the No. 4 motor 26. The output end of the motor 26 is detachably connected to a No. 3 screw rod 27 through a coupling, and a No. 2 fixed rod 28 is arranged in another movable vertical plate 25. The outer surfaces of the No. 3 screw rod 27 and the No. 2 fixed rod 28 are respectively threadedly connected and slidably connected with a No. 4 moving block 29. A second moving plate 30 is welded between the two No. 4 moving blocks 29. A No. 2 movable rod 31 is slidably arranged in the second moving plate 30. A detection head 32 is welded at the lower end of the No. 2 movable rod 31. A second spring 33 is sleeved on the outer surface of the No. 2 movable rod 31. When in use, the first moving plate 16 is driven to move by adjusting the hydraulic cylinder 15, and the roller 22 will also move accordingly. Move, after adjusting the roller 22 to be close to the surface of the steel structure, turn on the No. 3 motor 11 to drive the No. 2 screw 12 to rotate. At this time, the No. 3 moving block 14 will drive the hydraulic cylinder 15 and the first moving plate 16 to move leftward along with the rotation of the No. 2 screw 12, and at the same time drive the roller 22 to roll leftward on the surface of the steel structure. When there is a protrusion on the surface of the steel structure, the roller 22 will be pushed upward, and the No. 1 movable rod 20 will also be pushed upward, and at the same time push the contact block 21 to move upward. When the contact block 21 contacts the sensor 19, the sensor 19 will receive a signal and transmit it to the warning light 24 to light it up, indicating that the surface of the steel structure is not flat enough;During the flatness test, the hardness test equipment will also move to the left. After the flatness test is completed, the second movable plate 30 will be above the steel structure. At this time, the No. 4 motor 26 is turned on to drive the No. 3 screw 27 to rotate. At this time, the No. 4 movable block 29 will drive the second movable plate 30 to move downward with the rotation of the No. 3 screw 27. After moving to the contact between the detection head 32 and the surface of the steel structure, it will continue to move downward. At this time, the No. 2 movable rod 31 will slide upward. At this time, the elastic force of the second spring 33 will apply pressure to the detection head 32, and at the same time, it will apply pressure to the surface of the steel structure, so as to perform a hardness test on the steel structure, which can conveniently test the flatness of the steel structure and the hardness of the steel structure. ;
[0026] It should be noted that the utility model is a multifunctional inspection device for steel structure production. When in use, the inspection table 1, No. 1 motor 2, bidirectional threaded rod 3, No. 1 moving block 4, moving base 5, No. 2 motor 6, No. 1 screw rod 7, No. 2 moving block 8 and clamping plate 9 that are set can conveniently clamp and fix steel structures of different sizes to avoid the movement of the steel structure during the inspection process to affect the inspection result. When in use, the steel structure is placed between the two moving bases 5, and then the bidirectional threaded rod 3 is driven to rotate by turning on the No. 1 motor 2. At this time, the two No. 1 moving blocks 4 will drive the moving base 5 to move toward the center position as the bidirectional threaded rod 3 rotates, and at the same time, the left and right sides of the steel structure are clamped and fixed. After the fixation of both sides is completed, the No. 1 screw rod 7 is driven to rotate by turning on the No. 2 motor 6. At this time, the No. 2 moving block 8 will drive the clamping plate 9 to move as the No. 1 screw rod 7 rotates, and the front and rear ends of the steel structure are clamped and fixed. After the clamping and fixing are completed, it can be inspected. Steel structures of different sizes can be conveniently clamped and fixed to avoid the movement of the steel structure during the inspection process to affect the inspection result. The operation is convenient and quick. The fixed plate 10, the third motor 11, the second screw rod 12, the first fixed rod 13, the third moving block 14, the hydraulic cylinder 15, the first moving plate 16, the connecting column 17, the connecting frame 18, the sensor 19, the first movable rod 20, the contact block 21, the roller 22, the first spring 23 and the warning light 24 can be conveniently inspected for the flatness of the steel structure, and are highly practical. When in use, the first moving plate 16 is driven to move by adjusting the hydraulic cylinder 15, and the roller 22 will also move accordingly. After adjusting the roller 22 to be close to the surface of the steel structure, the first moving plate 16 is moved. Turn on the No. 3 motor 11 to drive the No. 2 screw rod 12 to rotate. At this time, the No. 3 moving block 14 will drive the hydraulic cylinder 15 and the first moving plate 16 to move leftward along with the rotation of the No. 2 screw rod 12, and at the same time drive the roller 22 to roll leftward on the surface of the steel structure. When a protrusion appears on the surface of the steel structure, the roller 22 will be pushed upward. At this time, the No. 1 movable rod 20 will also be pushed upward, and the contact block 21 will be pushed upward. When the contact block 21 contacts the sensor 19, the sensor 19 will receive a signal and transmit it to the warning light 24 to light it up, indicating that the surface of the steel structure is not flat enough.By setting the movable vertical plate 25, the fourth motor 26, the third screw rod 27, the second fixed rod 28, the fourth moving block 29, the second movable plate 30, the second movable rod 31, the detection head 32 and the second spring 33, the hardness of the steel structure can be conveniently tested. During the flatness test, the hardness testing device will also move to the left. After the flatness test is completed, the second movable plate 30 will be above the steel structure. At this time, the fourth motor 26 is turned on to drive the third screw rod 27 to rotate. At this time, the fourth moving block 29 will drive the second movable plate 30 to move downward with the rotation of the third screw rod 27. After moving to the detection head 32 and contacting the surface of the steel structure, it will continue to move downward. At this time, the second movable rod 31 will slide upward. At this time, the second spring 33 will apply pressure to the detection head 32 under the elastic force of the second spring 33, and at the same time, it will apply pressure to the surface of the steel structure, so as to test the hardness of the steel structure. It can conveniently test the flatness of the steel structure and the hardness of the steel structure, and it is highly practical. ;
[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A multifunctional inspection device for steel structure production, comprising an inspection table (1), characterized in that: A No. 1 motor (2) is arranged at the right end of the inspection platform (1), a bidirectional threaded rod (3) is arranged at the output end of the No. 1 motor (2), two No. 1 moving blocks (4) are arranged on the outer surface of the bidirectional threaded rod (3), a moving base (5) is arranged at the upper end of the No. 1 moving block (4), a No. 2 motor (6) is arranged at the front end of the moving base (5), a No. 1 screw rod (7) is arranged at the output end of the No. 2 motor (6), a No. 2 moving block (8) is arranged on the outer surface of the No. 1 screw rod (7), a clamping plate (9) is arranged on one side of the No. 2 moving block (8), and two fixing plates are arranged at both the front and rear ends of the inspection platform (1). (10), a No. 3 motor (11) is arranged on one side of the front end fixed plate (10), a No. 2 screw rod (12) is arranged on the output end of the No. 3 motor (11) through the fixed plate (10), a No. 1 fixed rod (13) is arranged between the two fixed plates (10) at the rear end, a No. 3 moving block (14) is arranged on the outer surface of the No. 2 screw rod (12) and the No. 1 fixed rod (13), a hydraulic cylinder (15) is arranged on the upper end of the No. 3 moving block (14), a first moving plate (16) is arranged on the output end of the two hydraulic cylinders (15), a connecting column (17) is arranged on the lower end of the first moving plate (16), and the connecting column (17) is arranged on the lower end of the first moving plate (16). A connecting frame (18) is provided at the lower end of the connecting column (17), a sensor (19) is provided on the inner surface of the upper end of the connecting frame (18), a plurality of No. 1 movable rods (20) are inserted into the lower end surface of the connecting frame (18), a contact block (21) is provided at the upper end of the No. 1 movable rod (20), a roller (22) is provided at the lower end of the No. 1 movable rod (20), a first spring (23) is provided on the outer surface of the No. 1 movable rod (20), a warning light (24) is provided at the upper end of the connecting frame (18), and a movable vertical plate (25) is provided on the outer surface of the No. 2 screw rod (12) and the No. 1 fixed rod (13), one of the movable vertical plates (25) A No. 4 motor (26) is arranged at the top, a No. 3 screw rod (27) is arranged at the output end of the No. 4 motor (26), a No. 2 fixed rod (28) is arranged in the other movable vertical plate (25), a No. 4 moving block (29) is arranged on the outer surface of the No. 3 screw rod (27) and the No. 2 fixed rod (28), a second movable plate (30) is arranged between the two No. 4 moving blocks (29), a No. 2 movable rod (31) is arranged in the second movable plate (30), a detection head (32) is arranged at the lower end of the No. 2 movable rod (31), and a second spring (33) is arranged on the outer surface of the No. 2 movable rod (31).
2. A multifunctional inspection device for steel structure production according to claim 1, characterized in that: The No. 1 motor (2) is detachably connected to the right end of the inspection table (1); a coupling is provided at the output end of the No. 1 motor (2); the output end of the No. 1 motor (2) is detachably connected to the bidirectional threaded rod (3) via the provided coupling; the No. 1 moving block (4) is threadedly connected to the outer surface of the bidirectional threaded rod (3); and the moving base (5) is welded to the upper end of the No. 1 moving block (4).
3. A multifunctional inspection device for steel structure production according to claim 1, characterized in that: The second motor (6) is detachably connected to the front end of the movable base (5); a coupling is provided at the output end of the second motor (6); the output end of the second motor (6) is detachably connected to the first screw rod (7) via the provided coupling; the second movable block (8) is threadedly connected to the outer surface of the first screw rod (7); and the clamping plate (9) is welded to one side of the second movable block (8).
4. A multifunctional inspection device for steel structure production according to claim 1, characterized in that: The third motor (11) is detachably connected to one side of the fixed plate (10); a coupling is provided at the output end of the third motor (11); the output end of the third motor (11) passes through the fixed plate (10) and is detachably connected to the second screw rod (12) through the provided coupling; one of the third moving blocks (14) is threadedly connected to the outer surface of the second screw rod (12); and the other of the third moving blocks (14) is slidably connected to the outer surface of the first fixed rod (13).
5. The multifunctional inspection device for steel structure production according to claim 1, characterized in that: The hydraulic cylinder (15) is detachably connected to the upper end of the third movable block (14), the first movable plate (16) is detachably connected to the output end of the hydraulic cylinder (15), a connecting column (17) is welded between the first movable plate (16) and the connecting frame (18), the first movable rod (20) is slidably connected to the connecting frame (18), and the sensor (19) is electrically connected to the warning light (24).
6. A multifunctional inspection device for steel structure production according to claim 1, characterized in that: The two movable vertical plates (25) are respectively threadedly connected and slidably connected to the outer surfaces of the second screw rod (12) and the first fixed rod (13); the fourth motor (26) is detachably connected to the top of the movable vertical plate (25); a coupling is provided at the output end of the fourth motor (26); the output end of the fourth motor (26) is detachably connected to the third screw rod (27) through the provided coupling; the two fourth movable blocks (29) are respectively threadedly connected and slidably connected to the outer surfaces of the third screw rod (27) and the second fixed rod (28); the second movable plate (30) is welded between the two fourth movable blocks (29); the second movable rod (31) is slidably connected to the inside of the second movable plate (30); and the detection head (32) is welded to the bottom of the second movable rod (31).