Digital twin foundation detection device for hydraulic engineering construction

Abstract

The invention relates to the field of detection facilities, in particular to a digital twin foundation detection device for hydraulic engineering construction, which comprises a detection table, a portal frame is fixedly mounted at the rear part of the upper end of the detection table, a vertical plate extends from the middle part of the upper end of the portal frame, and a guide rod is elastically mounted at the front end of the vertical plate; an impact detection part is installed at the lower end of the guide rod, two lifting lugs symmetrically extend from the upper end part of the guide rod, a push frame is slidably installed at the position, close to the side edge, of the upper end of the door frame in a penetrating mode, a claw seat is fixedly installed at one end of the push frame, lifting claws are slidably installed at the two ends of the claw seat, and the lifting claws abut against the lower ends of the lifting lugs. A wheel seat is elastically installed in the middle of the claw seat, and a claw pushing frame is rotationally installed between the wheel seat and the lifting claw. The device facilitates detection, can adapt to detection of foundation samples with different diameters, and ensures the accuracy of a detection result.

Description

Technical Field

[0001] The present invention relates to the field of detection facilities, and particularly to a foundation detection device for digital twin in water conservancy project construction. Background Art

[0002] With the development of digital twin technology, its application in the foundation detection of water conservancy projects has gradually attracted attention. By using the detected foundation data to create a digital twin model of the foundation, the status of the foundation can be monitored and analyzed in real time. During the process of detecting the foundation of a water conservancy project, it is often necessary to conduct impact tests on the surface of the sampled foundation samples to obtain the strength data of the foundation, providing a reference for creating the digital twin model of the foundation.

[0003] However, in the existing spring impact facilities during the detection process, it is necessary to first manually fix the foundation samples, and then operate to make the spring contract and release to generate an impact force for impact testing on the foundation samples. The detection process requires multiple operations, which is quite cumbersome and results in inconvenient detection. Summary of the Invention

[0004] The purpose of the present invention is to solve the drawbacks existing in the background art, and to propose a foundation detection device for digital twin in water conservancy project construction.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a foundation detection device for digital twin in water conservancy project construction, including a detection table. A gantry is fixedly installed at the rear part of the upper end of the detection table. A vertical plate extends from the middle of the upper end of the gantry. A guide rod is elastically installed at the front end of the vertical plate. An impact detection member is installed at the lower end of the guide rod. Two lifting ears symmetrically extend from the upper end of the guide rod. A push frame is slidably installed through the side edge near the upper end of the gantry. A claw seat is fixedly installed at one end of the push frame. Lifting claws are slidably installed at both ends of the claw seat. The lifting claws abut against the lower ends of the lifting ears. A wheel seat is elastically installed in the middle of the claw seat. A push claw frame is rotatably installed between the wheel seat and the lifting claw. A roller is installed inside the wheel seat. A release guide rail is installed at the upper edge of the front end of the vertical plate, corresponding to the roller. A toothed plate is fixedly installed at the other end of the push frame. A gear meshes with the front part of the toothed plate. A turning shaft is penetrated and inlaid inside the gear. The turning shaft is connected to the detection table. Two V-shaped upper seats are symmetrically connected to the end of the turning shaft. Two V-shaped lower seats are symmetrically arranged at the front part of the upper end of the detection table.

[0006] Preferably, a servo push cylinder is fixedly installed at the rear end of the gantry. The output end of the servo push cylinder is fixed to the push frame. A shaft seat is rotatably installed on the outer surface of the turning shaft. The lower end of the shaft seat is fixed to the detection table.

[0007] Preferably, a guide base extends from the lower part of the front end of the vertical plate. A groove is formed on the outer surface of the guide rod. The guide base is slidably mounted on the outer surface of the guide rod. An impact spring is wound around the outer side of the guide rod. One end of the impact spring is fixed to the lower end of the guide base, and the other end of the impact spring is fixed to the lower end of the guide rod.

[0008] Preferably, a rail frame is fixedly mounted at the rear end of the release guide rail. The end of the rail frame is fixed to the vertical plate. A sleeve seat is fixedly mounted in the middle of the upper end of the claw seat. A directional sleeve is penetrated and embedded in the sleeve seat. A directional column extends from the front end of the wheel seat. The directional sleeve is slidably mounted on the outer surface of the directional column.

[0009] Preferably, a gathering spring is wound around the outer sides of the directional sleeve and the directional column. One end of the gathering spring is fixed to the sleeve seat, and the other end of the gathering spring is fixed to the wheel seat.

[0010] Preferably, the impact detection member includes an impact force sensor fixedly mounted on the lower end surface of the guide rod, and a punch is fixedly mounted on the detection end of the impact force sensor.

[0011] Preferably, a carrier is fixedly mounted at the end of the turning shaft. A second threaded column is rotatably mounted between the upper and lower end surfaces of the carrier. The second threaded column penetrates out from the lower end of the carrier. A second threaded sleeve is screwed on the outer surface of the second threaded column. A upper seat frame is fixedly mounted at the front end of the second threaded sleeve. Both ends of the upper seat frame are respectively fixed to two V-shaped upper seats. A slider extends from the rear end of the second threaded sleeve. A chute is formed at the rear end inside the carrier. The slider is slidably mounted inside the chute.

[0012] Preferably, a first threaded sleeve is rotatably penetrated through the front part of the upper end of the detection table. A lower seat frame is fixedly mounted between the lower end surfaces of the two V-shaped lower seats. A first threaded column is fixedly mounted in the middle of the lower end of the lower seat frame. The first threaded sleeve is screwed on the outer surface of the first threaded column. Guide columns are arranged on both sides of the first threaded column. The upper ends of the guide columns are fixed to the lower seat frame. The guide columns penetrate through the upper end surface of the detection table. The guide columns are slidably connected to the detection table. A positioning frame is arranged on the side of one of the V-shaped lower seats. The lower end of the positioning frame is fixed to the detection table.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Through the moving push frame, the toothed plate can be driven to move upward, thereby driving the gear to rotate, enabling the V-shaped upper seat on the turning shaft to flip and press on the foundation sample. During this process, the push frame will also drive the claw seat to move upward, so as to lift the lifting ear through the lifting claw, causing the punch to move upward, and at the same time, the impact spring contracts to store energy. When the roller on the claw seat contacts the release guide rail and the claw seat continues to move upward, the roller will roll along the inclined section of the release guide rail to drive the push claw frame to move and push the lifting claw, causing the two lifting claws to move in opposite directions to disengage from the lower end of the lifting ear. At this time, the fully contracted impact spring is released without the support of the lifting claw to drive the punch to move downward to conduct an impact test on the foundation sample. This process does not require multiple operations, effectively facilitating the detection.

[0015] 2. By rotating the first threaded sleeve, the first threaded post can be driven to move, thereby driving the V-shaped lower seat to move for adjustment. At the same time, by rotating the second threaded post, the second threaded sleeve can be driven to move, thereby driving the V-shaped upper seat to move for adjustment, so that the distance between the V-shaped upper seat and the V-shaped lower seat can adapt to foundation samples of different diameters to meet the detection requirements. At the same time, during the adjustment process, the top of the horizontally placed foundation sample can be attached to the positioning frame before adjustment to avoid the top position of the foundation sample moving upward when the foundation sample is fixed after adjustment, resulting in a decrease in the distance between the top of the foundation sample and the punch, causing the impact spring to be unable to fully release during the impact process and resulting in a weakening of the impact force, thereby ensuring the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a foundation detection device for digital twin in water conservancy project construction according to the present invention;

[0017] Figure 2 is a schematic view of the gantry of a foundation detection device for digital twin in water conservancy project construction according to the present invention;

[0018] Figure 3 is a foundation detection device for digital twin in water conservancy project construction according to the present invention Figure 1 magnified view of A;

[0019] Figure 4 is a foundation detection device for digital twin in water conservancy project construction according to the present invention Figure 2 magnified view of B;

[0020] Figure 5 is a schematic view of the claw seat of a foundation detection device for digital twin in water conservancy project construction according to the present invention;

[0021] Figure 6 is a schematic view of the release guide rail of a foundation detection device for digital twin in water conservancy project construction according to the present invention;

[0022] Figure 7 Schematic diagram of the V-shaped upper seat of the foundation detection device for digital twin used in a water conservancy project construction of the present invention;

[0023] Figure 8 Usage view of the foundation detection device for digital twin used in a water conservancy project construction of the present invention.

[0024] In the figure: 1, detection table; 2, gantry; 3, vertical plate; 4, guide seat; 5, shaft seat; 6, servo push cylinder; 7, push frame; 8, toothed plate; 9, gear; 10, turning shaft; 11, push claw frame; 12, release guide rail; 13, roller; 14, guide rod; 15, impact spring; 16, impact force sensor; 17, V-shaped upper seat; 18, punch; 19, V-shaped lower seat; 20, lower seat frame; 21, first threaded column; 22, first threaded sleeve; 23, guide post; 24, positioning frame; 25, lifting ear; 26, lifting claw; 27, groove; 28, carrier frame; 29, second threaded column; 30, second threaded sleeve; 31, upper seat frame; 32, rail frame; 33, chute; 34, slider; 35, claw seat; 36, wheel seat; 37, orientation column; 38, orientation sleeve; 39, gathering spring; 40, sleeve seat; 41, foundation sample. Detailed implementation manners

[0025] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0026] Such as Figures 1 - 8A foundation detection device for digital twin in water conservancy project construction, including a detection table 1. At the rear part of the upper end of the detection table 1, a gantry 2 is fixedly installed. In the middle of the upper end of the gantry 2, a vertical plate 3 extends. The gantry 2 plays a supporting role. At the front end of the vertical plate 3, a guide rod 14 is elastically installed. At the lower end of the guide rod 14, an impact detection piece is installed. The guide rod 14 plays a role in vertically guiding the punch 18. At the upper end of the guide rod 14, two lifting ears 25 symmetrically extend. Near the side edge of the upper end of the gantry 2, a push frame 7 is slidably installed through. At one end of the push frame 7, a claw seat 35 is fixedly installed. The push frame 7 plays a role in driving the claw seat 35 and the toothed plate 8 to move synchronously. At both ends of the claw seat 35, lifting claws 26 are slidably installed. The claw seat 35 plays a role in carrying and guiding the lifting claws 26. The lifting ears 25 can be lifted by the lifting claws 26, causing the punch 18 to move upward. At the same time, the impact spring 15 contracts to store energy. The lifting claws 26 abut against the lower end of the lifting ears 25. In the middle of the claw seat 35, a wheel seat 36 is elastically installed. Between the wheel seat 36 and the lifting claws 26, a push claw frame 11 is rotatably installed. Inside the wheel seat 36, a roller 13 is installed. The wheel seat 36 plays a role in carrying the roller 13. At the upper edge of the front end of the vertical plate 3, a release guide rail 12 is installed. The release guide rail 12 corresponds to the roller 13. The roller 13 will roll along the inclined section of the release guide rail 12 to drive the push claw frame 11 to move and push the lifting claws 26, causing the two lifting claws 26 to move in opposite directions to disengage from the lower end of the lifting ears 25. At this time, the contracted impact spring 15 is released without the support of the lifting claws 26 to drive the punch 18 to move downward to perform an impact test on the tightly fixed foundation sample 41. At the other end of the push frame 7, a toothed plate 8 is fixedly installed. In the front part of the toothed plate 8, a gear 9 is engaged. Inside the gear 9, a turning shaft 10 is penetrated and inlaid. The turning shaft 10 is connected to the detection table 1. At the end of the turning shaft 10, two V-shaped upper seats 17 are symmetrically connected. The toothed plate 8 will drive the gear 9 to rotate, enabling the V-shaped upper seats 17 on the turning shaft 10 to flip and press on the foundation sample 41 for fixation. At the front part of the upper end of the detection table 1, two V-shaped lower seats 19 are symmetrically arranged. The V-shaped designs of the V-shaped upper seats 17 and the V-shaped lower seats 19 can adapt to foundation samples 41 with different diameters for tight fixation. At the same time, after the foundation sample 41 is placed on the V-shaped lower seat 19, the V-shaped lower seat 19 will position the foundation sample 41 so that the center of the foundation sample 41 and the punch 18 are on the same vertical line, thereby ensuring that when the punch 18 impacts, it can fully impact on the foundation sample 41 to avoid the phenomenon that the punch 18 is inclined and damaged during impact due to the misalignment of the two.

[0027] At the rear end of the gantry 2, a servo push cylinder 6 is fixedly installed. The output end of the servo push cylinder 6 is fixed to the push frame 7. The servo push cylinder 6 plays a role in driving the push frame 7 to move. On the outer surface of the turning shaft 10, a shaft seat 5 is rotatably installed. The lower end of the shaft seat 5 is fixed to the detection table 1. The shaft seat 5 plays a role in supporting the turning shaft 10.

[0028] At the lower part of the front end of the vertical plate 3, a guide seat 4 extends. A groove 27 is formed on the outer surface of the guide rod 14. The groove 27 serves to prevent the guide rod 14 from rotating. The guide seat 4 is slidably mounted on the outer surface of the guide rod 14, and the guide seat 4 serves to allow the guide rod 14 to slide. An impact spring 15 is wound around the outer side of the guide rod 14. As shown in the figure, the impact spring 15 is in a state where it has shrunk partially. One end of the impact spring 15 is fixed to the lower end of the guide seat 4, and the other end of the impact spring 15 is fixed to the lower end of the guide rod 14. The impact spring 15 can generate an impact force for impact testing.

[0029] At the rear end of the release guide rail 12, a rail frame 32 is fixedly installed. The end of the rail frame 32 is fixed to the vertical plate 3. The rail frame 32 serves to fix the release guide rail 12. In the middle of the upper end of the claw seat 35, a sleeve seat 40 is fixedly installed. A directional sleeve 38 is inserted through and embedded in the interior of the sleeve seat 40. The sleeve seat 40 serves to fix the directional sleeve 38. At the front end of the wheel seat 36, a directional column 37 extends. The directional sleeve 38 is slidably mounted on the outer surface of the directional column 37. The directional sleeve 38 and the directional column 37 serve to guide the wheel seat 36.

[0030] A gathering spring 39 is wound around the outer sides of the directional sleeve 38 and the directional column 37. One end of the gathering spring 39 is fixed to the sleeve seat 40. The gathering spring 39 can drive the push claw frame 11 to move, so that the moved lifting claws 26 are reset and gathered. The other end of the gathering spring 39 is fixed to the wheel seat 36. After the impact detection is completed, the upper end of the guide rod 14 will press on the guide seat 4, keeping the lifting ear 25 stationary. Subsequently, the push frame 7 will move downward to drive the V-shaped upper seat 17 to rotate in the reverse direction to loosen the fixed foundation sample 41. At the same time, the downward-moving push frame 7 will also drive the claw seat 35 downward. When the lifting claws 26 move downward and press on the lifting ear 25, the lifting claws 26 will move laterally under the drive of their own inclined surfaces and the inclined surface of the lifting ear 25, enabling the lifting claws 26 to smoothly pass through the lifting ear 25. Subsequently, the lifting claws 26 are reset under the action of the gathering spring 39 to reposition at the lower end of the lifting ear 25.

[0031] The impact detection member includes an impact force sensor 16 fixedly installed on the lower end surface of the guide rod 14. A punch 18 is fixedly installed at the detection end of the impact force sensor 16. The impact force sensor 16 can display the impact force.

[0032] A carrier 28 is fixedly installed at the end of the turning shaft 10. A second threaded column 29 is rotatably installed between the upper and lower end faces inside the carrier 28. The carrier 28 serves to support the second threaded column 29. The second threaded column 29 penetrates out from the lower end of the carrier 28. A second threaded sleeve 30 is screwed onto the outer surface of the second threaded column 29. The second threaded column 29 and the second threaded sleeve 30 serve to adjust the position of the V-shaped upper seat 17. A seat frame 31 is fixedly installed at the front end of the second threaded sleeve 30. Both ends of the seat frame 31 are fixed to the two V-shaped upper seats 17 respectively. The seat frame 31 serves to support the V-shaped upper seat 17. A slider 34 extends from the rear end of the second threaded sleeve 30. A chute 33 is provided at the rear end inside the carrier 28. The slider 34 is slidably installed inside the chute 33. The slider 34 and the chute 33 serve to guide the second threaded sleeve 30.

[0033] A first threaded sleeve 22 is rotatably installed through the front part of the upper end of the test bench 1. A lower seat frame 20 is fixedly installed between the lower end faces of the two V-shaped lower seats 19. The lower seat frame 20 serves to support the V-shaped lower seats 19. A first threaded column 21 is fixedly installed in the middle of the lower end of the lower seat frame 20. The first threaded sleeve 22 and the first threaded column 21 serve to adjust the position of the V-shaped lower seats 19. The first threaded sleeve 22 is screwed onto the outer surface of the first threaded column 21. Guide columns 23 are provided on both sides of the first threaded column 21. The upper ends of the guide columns 23 are fixed to the lower seat frame 20. The guide columns 23 serve to guide the V-shaped lower seats 19. The guide columns 23 penetrate through the upper end face of the test bench 1. The guide columns 23 are slidably connected to the test bench 1. A positioning frame 24 is provided on the side of one of the V-shaped lower seats 19. The lower end of the positioning frame 24 is fixed to the test bench 1. The positioning frame 24 can position the foundation sample 41, so that when impact tests are carried out on foundation samples 41 with different diameters, the distance between the top of the foundation sample 41 and the punch 18 will not change, enabling the impact spring 15 to be fully released to ensure the consistency of the impact force and guarantee the detection accuracy.

[0034] During detection, the top of the horizontally placed foundation sample 41 is attached to the positioning frame 24. Subsequently, the first threaded sleeve 22 is rotated according to the diameter of the foundation sample 41 to be detected, so as to drive the movement of the first threaded column 21, and then drive the movement of the V-shaped lower seat 19 for adjustment. At the same time, the second threaded column 29 is rotated to drive the movement of the second threaded sleeve 30, and then drive the movement of the V-shaped upper seat 17 for adjustment, so that the distance between the V-shaped upper seat 17 and the V-shaped lower seat 19 can adapt to the diameter of the foundation sample 41. Subsequently, the foundation sample 41 is placed on the V-shaped lower seat 19. Then, the servo push cylinder 6 works to drive the push frame 7 to move upward, so as to drive the toothed plate 8 to move upward through the push frame 7, and then drive the gear 9 to rotate, so that the V-shaped upper seat 17 on the turning shaft 10 can be turned over and pressed on the foundation sample 41. During this process, the push frame 7 will also drive the claw seat 35 to move upward, so as to lift the lifting ear 25 through the lifting claw 26, so that the punch 18 moves upward, and at the same time, the impact spring 15 contracts for energy storage. When the roller 13 on the claw seat 35 contacts the release guide rail 12, when the claw seat 35 continues to move upward, the roller 13 will roll along the inclined section of the release guide rail 12 to drive the push claw frame 11 to move and push the lifting claw 26, so that the two lifting claws 26 move in opposite directions to disengage from the lower end of the lifting ear 25. At this time, the contracted impact spring 15 is released without the support of the lifting claw 26 to drive the punch 18 to move downward to perform an impact test on the tightly fixed foundation sample 41.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A digital twin foundation detection device for water conservancy project construction, including a detection table (1), characterized in that: At the rear part of the upper end of the detection table (1), a gantry (2) is fixedly installed. In the middle of the upper end of the gantry (2), a vertical plate (3) extends. At the front end of the vertical plate (3), a guide rod (14) is elastically installed. At the lower end of the guide rod (14), an impact detection member is installed. At the upper end of the guide rod (14), two lifting ears (25) symmetrically extend. Near the side edge of the upper end of the gantry (2), a push frame (7) is slidably installed through. At one end of the push frame (7), a claw seat (35) is fixedly installed. At both ends of the claw seat (35), lifting claws (26) are slidably installed. The lifting claws (26) abut against the lower end of the lifting ears (25). In the middle of the claw seat (35), a wheel seat (36) is elastically installed. Between the wheel seat (36) and the lifting claws (26), a push claw frame (11) is rotatably installed. Inside the wheel seat (36), a roller (13) is installed. At the upper front edge of the front end of the vertical plate (3), a release guide rail (12) is installed. The release guide rail (12) corresponds to the roller (13). At the other end of the push frame (7), a toothed plate (8) is fixedly installed. In front of the toothed plate (8), a gear (9) is engaged. Inside the gear (9), a turning shaft (10) is penetrated and inlaid. The turning shaft (10) is connected to the detection table (1). At the end of the turning shaft (10), two V-shaped upper seats (17) are symmetrically connected. At the front part of the upper end of the detection table (1), two V-shaped lower seats (19) are symmetrically arranged.

2. The foundation detection device for digital twin used in water conservancy project construction according to claim 1, characterized in that: At the rear end of the gantry (2), a servo push cylinder (6) is fixedly installed. The output end of the servo push cylinder (6) is fixed to the push frame (7). On the outer surface of the turning shaft (10), a shaft seat (5) is rotatably installed. The lower end of the shaft seat (5) is fixed to the detection table (1).

3. The foundation detection device for digital twin used in water conservancy project construction according to claim 1, characterized in that: At the lower part of the front end of the vertical plate (3), a guide seat (4) extends. On the outer surface of the guide rod (14), a groove (27) is formed. The guide seat (4) is slidably installed on the outer surface of the guide rod (14). An impact spring (15) is wound around the outside of the guide rod (14). One end of the impact spring (15) is fixed to the lower end of the guide seat (4). The other end of the impact spring (15) is fixed to the lower end of the guide rod (14).

4. The foundation detection device for digital twin used in water conservancy project construction according to claim 1, characterized in that: At the rear end of the release guide rail (12), a rail frame (32) is fixedly installed. The end of the rail frame (32) is fixed to the vertical plate (3). At the middle of the upper end of the claw seat (35), a sleeve seat (40) is fixedly installed. Inside the sleeve seat (40), a directional sleeve (38) is penetrated and inlaid. At the front end of the wheel seat (36), a directional column (37) extends. The directional sleeve (38) is slidably installed on the outer surface of the directional column (37).

5. The foundation detection device for digital twin used in water conservancy project construction according to claim 4, characterized in that: Around the outside of the directional sleeve (38) and the outside of the directional column (37), a gathering spring (39) is wound. One end of the gathering spring (39) is fixed to the sleeve seat (40). The other end of the gathering spring (39) is fixed to the wheel seat (36).

6. The foundation detection device for digital twin used in water conservancy project construction according to claim 1, characterized in that: The impact detection member includes an impact force sensor (16) fixedly installed on the lower end surface of the guide rod (14). At the detection end of the impact force sensor (16), a punch (18) is fixedly installed.

7. The foundation detection device for digital twin used in water conservancy project construction according to claim 1, characterized in that: A carrier (28) is fixedly installed at the end of the turning shaft (10). A second threaded column (29) is rotatably installed between the upper and lower end faces inside the carrier (28). The second threaded column (29) penetrates out from the lower end of the carrier (28). A second threaded sleeve (30) is screwed onto the outer surface of the second threaded column (29). A upper seat frame (31) is fixedly installed at the front end of the second threaded sleeve (30). Both ends of the upper seat frame (31) are fixed to the two V-shaped upper seats (17) respectively. A slider (34) extends from the rear end of the second threaded sleeve (30). A chute (33) is formed at the rear end inside the carrier (28). The slider (34) is slidably installed inside the chute (33).

8. The foundation detection device for digital twin used in water conservancy project construction according to claim 7, characterized in that: A first threaded sleeve (22) is rotatably installed through the front part of the upper end of the inspection table (1). A lower seat frame (20) is fixedly installed between the lower end faces of the two V-shaped lower seats (19). A first threaded column (21) is fixedly installed in the middle of the lower end of the lower seat frame (20). The first threaded sleeve (22) is screwed onto the outer surface of the first threaded column (21). Guide columns (23) are arranged on both sides of the first threaded column (21). The upper ends of the guide columns (23) are fixed to the lower seat frame (20). The guide columns (23) penetrate through the upper end face of the inspection table (1). The guide columns (23) are slidably connected to the inspection table (1). A positioning frame (24) is arranged beside one of the V-shaped lower seats (19). The lower end of the positioning frame (24) is fixed to the inspection table (1).

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