A truss gap detection tool

Abstract

This invention discloses a truss gap detection fixture, specifically relating to the technical field of gap detection devices. It includes a housing, with a detection mechanism located in the center of the housing cavity. Clamping mechanisms for securing the device are fixedly installed at both ends of the housing. A support mechanism for supporting the device is located behind the detection mechanism. A lifting ring for easy pulling of the device is fixedly installed at the center of the upper end of the housing. This truss gap detection fixture, with its clamping mechanism working in conjunction with the detection mechanism, effectively secures the device. The retractable support tube and movable tube prevent pressure on the truss when the fixed wheel contacts the truss surface, ensuring consistent contact without damaging the device components or applying excessive force to the truss, thus maintaining the integrity of the truss surface. Furthermore, the fixture is adaptable to trusses of different sizes.

Description

Technical Field

[0001] This invention relates to the field of gap detection device technology, and in particular to a truss gap detection fixture. Background Technology

[0002] A truss is a supporting beam structure made up of members connected by welding, riveting or bolting. Truss members mainly bear axial tension or compression, thus making full use of the strength of the material. When the span is large, it saves material compared to solid beams, reduces self-weight and increases stiffness.

[0003] Clearance refers to the difference between the size of the hole and the size of the mating shaft, which is a positive value. Truss connectors need to be fixed with bolts, so there are many holes. Before the truss is used, the coaxiality deviation of the truss and the through holes needs to be checked.

[0004] Chinese patent document CN108824188A discloses a high-stability truss bridge detection device with anti-tipping function, including two mounting plates and two truss bodies set on the bottom sidewall of the mounting plates. The opposing sidewalls of the two truss bodies are fixedly connected to fixing plates. The two truss bodies are rotatably connected to the mounting plate on the same side by a first threaded rod. The bottom sidewall of one of the mounting plates is fixedly connected to a first servo motor, and the output shaft end of the first servo motor is fixedly connected to a first drive wheel.

[0005] While this patented device can be clamped and fixed to a bridge for testing in daily use, it lacks cushioning when fixed to the bridge. Directly clamping the device to the bridge surface not only causes wear and tear on the device components but also damages the bridge surface. Furthermore, the device requires numerous manual adjustments during testing, making it cumbersome to use. Moreover, the device's stability cannot be guaranteed during installation, and it cannot be installed horizontally on the bridge, resulting in low accuracy when the device is moving. Summary of the Invention

[0006] The main objective of this invention is to provide a truss gap detection fixture that can effectively solve the problems of damage to the bridge surface and inability to guarantee the stability of the device when it is fixed.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A truss gap detection fixture includes a housing, a detection mechanism in the middle of the inner cavity of the housing, clamping mechanisms fixedly installed at both the left and right ends of the housing, a support mechanism at the rear of the detection mechanism, and a lifting ring fixedly installed at the middle of the upper end of the housing.

[0009] Two rotating rollers are provided at both the front and rear ends of the housing. The two rotating rollers on the front side are connected by a connecting shaft at their ends that are close to each other. A motor is fixedly installed between the two rotating rollers on the front side and is mounted on the front end of the housing. Three meshing bevel gears are provided on the lower side of the motor.

[0010] Preferably, the upper bevel gear is connected to the motor output end, and the left and right bevel gears are respectively connected to the two connecting shafts.

[0011] Preferably, the detection mechanism includes a hydraulic tank, a cylinder fixedly installed at the rear of the housing, a piston plate in the inner cavity of the hydraulic tank, the piston plate being fixedly connected to the output end of the cylinder, a connecting box fixedly installed at the upper end of the hydraulic tank, a control box fixedly installed at the upper end of the connecting box, flow pipes fixedly installed at both ends of the control box, a telescopic pipe fixedly installed at the front end of the control box, and a detection device fixedly installed at the lower end of the telescopic pipe.

[0012] Preferably, the control box and the hydraulic tank are all interconnected with the connecting box.

[0013] Preferably, the control box includes a box body, with outlet holes at both the left and right ends of the box body. Threaded rods are rotatably mounted on the inner walls of both the left and right sides of the box body. L-shaped plates are provided on the surfaces of the two threaded rods. Three meshing bevel gears are provided between the two threaded rods. The bevel gears on the left and right sides are respectively connected to the two threaded rods. A support shaft is fixedly installed at the rear end of the bevel gear located on the rear side. Two meshing transmission gears are provided on the rear side of the box body. The transmission gear located on the upper side is connected to the support shaft.

[0014] Preferably, the clamping mechanism includes a U-shaped tube, which is connected to the flow tube located on the same side. A support tube is fixedly installed on the lower horizontal end face of the U-shaped tube. A movable tube is slidably installed inside the support tube. An inflow hole is opened in the middle of the horizontal end face of the movable tube near the support tube. A piston rod is slidably installed inside the movable tube. A fixed wheel is provided at the end of the piston rod away from the support tube. A spring is fixedly installed between the fixed wheel and the movable tube.

[0015] Preferably, the arc-shaped surface of the piston rod on the rear side is tightly fitted to the inner cavity of the movable tube.

[0016] Preferably, the support mechanism includes a telescopic rod, which is fixedly installed on the upper inner wall of the housing. A shell is fixedly installed at the lower end of the telescopic rod. A support plate is fixedly installed in the inner cavity of the housing on the lower side of the shell. A support base is slidably installed in the inner cavity of the support plate. A connecting pipe is fixedly installed at the upper end of the support base. The connecting pipe passes through the upper inner wall of the support plate and is connected to the shell. A rack is fixedly installed on the lower surface of the telescopic rod.

[0017] Preferably, the rack meshes with the transmission gear located on the lower side.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The clamping mechanism of this invention, used in conjunction with the detection mechanism, allows the fixed wheels to clamp the truss from both sides, effectively securing the device. The support tube and movable tube retract, preventing the fixed wheels from squeezing the truss when they contact the truss surface. This ensures the fixed wheels remain in contact with the truss surface, preventing damage to the device's components and avoiding excessive force on the truss, thus maintaining the integrity of the truss surface. Furthermore, the device can adapt to trusses of different sizes.

[0020] The support mechanism provided by this invention can effectively support the device before it is fixed, allowing the device to be horizontally fixed on the truss, ensuring the accuracy of subsequent testing. After the device is fixed, the position and height of the testing device can be adjusted by continuing to start the cylinder, making the device more convenient to use. When the rotating roller moves the device, the fixed wheel will not generate a large friction force with the truss, ensuring the stability of the device during movement and further ensuring the integrity of the truss surface. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 This is a schematic diagram showing the partial structural positions of the present invention;

[0024] Figure 4 This is a schematic diagram of the location and structure of the detection mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of the control box of the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the clamping mechanism of the present invention;

[0027] Figure 7 This is a schematic diagram of the position and structure of the support mechanism of the present invention;

[0028] Figure 8 For the present invention Figure 7 Enlarged view of point A in the image;

[0029] Figure 9 This is a diagram showing the working state of the device of the present invention on the truss;

[0030] Figure 10 This is a schematic diagram of the inside of the control box after the device of the present invention has been fixed.

[0031] In the diagram: 1. Shell; 2. Detection mechanism; 3. Clamping mechanism; 4. Support mechanism; 5. Lifting ring; 11. Rotating roller; 12. Motor; 13. Connecting shaft; 14. Bevel gear one; 21. Hydraulic tank; 22. Cylinder; 23. Piston plate; 24. Connecting box; 25. Control box; 26. Flow pipe; 27. Telescopic pipe; 28. Detection device; 251. Box body; 252. Outlet hole; 253. Threaded rod; 254. L-shaped plate; 255. Bevel gear two; 256. Support shaft; 257. Transmission gear; 31. U-shaped tube; 32. Support tube; 33. Movable tube; 34. Inlet hole; 35. Piston rod; 36. Elastic spring; 37. Fixed wheel; 41. Telescopic rod; 42. Shell; 43. Support plate; 44. Support base; 45. Connecting pipe; 46. Rack. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments. Example

[0033] like Figure 1 and Figure 2 As shown, a truss gap detection fixture includes a housing 1. A detection mechanism 2 is provided in the middle of the inner cavity of the housing 1. The detection mechanism 2 provides clamping power to two clamping mechanisms 3. After clamping, the alignment holes of different heights of the truss can be detected by the detection mechanism 2. Clamping mechanisms 3 for fixing the device are fixedly installed at both ends of the housing 1. The device can be fixed on the truss by the two clamping mechanisms 3 so that the truss can be detected. When the device is fixed by the two clamping mechanisms 3, it will not cause damage to the surface of the truss, so the device can be fixed well.

[0034] In addition, the detection mechanism 2 is provided with a support mechanism 4 for supporting the device. When fixing the device, it is necessary to stabilize the device on the truss through the support mechanism 4 to prevent it from moving. If the device cannot be kept horizontal, it will be difficult to detect the alignment hole of the truss. A lifting ring 5 for easy pulling of the device is fixedly installed in the middle of the upper end of the housing 1. Since the truss is generally quite large, when moving the device, it is necessary to use the lifting ring 5 to hang it on other moving devices in order to install the device.

[0035] It should be noted that the gap refers to the gap between the bolt and the inner wall of the hole when the bolt is placed inside the hole. When the gap is small, it is more troublesome to install the bolt. When the gap is too large, the bolt will wobble after installation, which will affect the subsequent use of the truss. It can also be used to check the coaxiality of the alignment holes and whether the truss components are level.

[0036] To further explain, in order to move the device fixed to the truss, such as Figure 3 As shown, the housing 1 has two rotating rollers 11 at both the front and rear ends. The rotating rollers 11 engage with the surface of the truss and have a large frictional force between them. The device can be moved on the upper end of the truss by multiple rotating rollers 11, which facilitates the detection of multiple alignment holes. The two rotating rollers 11 on the front side are connected by a connecting shaft 13 at their close ends. A motor 12 is fixedly installed at the front end of the housing 1 between the two rotating rollers 11 on the front side. The motor 12 is the power source for the movement of the entire device. By starting the motor 12, the two rotating rollers 11 on the front side are driven to rotate, so that the entire device moves.

[0037] Then, three meshing bevel gears 14 are provided on the lower side of the motor 12, which connect the output end of the motor 12 to the two connecting shafts 13. The upper bevel gear 14 is connected to the output end of the motor 12, and the left and right bevel gears 14 are connected to the two connecting shafts 13 respectively. When the rotating roller 11 is started, it can drive the three bevel gears 14 to rotate simultaneously. The left and right bevel gears 14 will drive the two rotating rollers 11 to rotate through the connecting shafts 13.

[0038] It should be noted that only the two rotating rollers 11 on the front side need to rotate to move the entire device. The two rotating rollers 11 on the rear side are for maintaining the balance of the device and preventing it from shifting or rotating backward when moving, thus further improving the detection effect of the device.

[0039] To further explain, in order to better detect gaps in the truss, such as Figure 4As shown, the detection mechanism 2 includes a hydraulic tank 21, which is fixedly installed in the inner cavity of the housing 1 and filled with hydraulic oil. A cylinder 22 is fixedly installed at the rear of the hydraulic tank 21 and is located at the rear end of the housing 1. By extending and retracting the output end of the cylinder 22, the two clamping mechanisms 3 can be controlled to fix the device and detect the alignment holes at different heights. A piston plate 23 is provided in the inner cavity of the hydraulic tank 21. The piston plate 23 is fixedly connected to the output end of the cylinder 22. The piston plate 23 and the hydraulic tank 21 form a piston. By pushing the piston plate 23 to move inside the hydraulic tank 21 through the cylinder 22, the hydraulic oil inside the hydraulic tank 21 can be squeezed to flow.

[0040] Then, a connecting box 24 is fixedly installed on the upper end of the hydraulic tank 21. The connection between the connecting box 24 and the hydraulic tank 21 is the front end of the hydraulic tank 21. When the piston plate 23 can squeeze out all the hydraulic oil in the hydraulic tank 21, a control box 25 is fixedly installed on the upper end of the connecting box 24. The control box 25, the hydraulic tank 21, and the connecting box 24 are all interconnected. The hydraulic oil in the hydraulic tank 21 flows into the control box 25 through the connecting box 24. Flow pipes 26 are fixedly installed on both the left and right ends of the control box 25. When the hydraulic oil enters the flow pipe 26, it will flow into the clamping mechanism 3 through the flow pipe 26 to fix the device. A telescopic pipe 27 is fixedly installed on the front end of the control box 25. A detection device 28 is fixedly installed on the lower end of the telescopic pipe 27. When the hydraulic oil in the control box 25 enters the telescopic pipe 27, the position and height of the detection device 28 can be adjusted to better detect the alignment holes on the truss.

[0041] Specifically, the cylinder 22 is activated, causing it to push the piston plate 23 to move. The piston plate 23 pushes the hydraulic oil in the hydraulic tank 21 to flow. The hydraulic oil enters the control box 25 through the connecting box 24. When the hydraulic oil in the control box 25 enters the clamping mechanism 3 through the two flow pipes 26, the two clamping mechanisms 3 will fix the device on the truss. When the hydraulic oil in the control box 25 enters the telescopic pipe 27, the telescopic pipe 27 can drive the detection device 28 to move up and down to detect the alignment holes at different heights.

[0042] It should be noted that under normal circumstances, when the device needs to be fixed, the hydraulic oil in the control box 25 cannot enter the telescopic pipe 27, but can only flow into the two flow pipes 26. When the device is fixed and testing is required, the hydraulic oil in the control box 25 cannot enter the two flow pipes 26, but can only flow into the telescopic pipe 27.

[0043] To further explain, in order to secure the device to the truss, such as Figure 5As shown, the clamping mechanism 3 includes a U-shaped tube 31, which is connected to the flow tube 26 located on the same side. A support tube 32 is fixedly installed on the lower horizontal end face of the U-shaped tube 31. The hydraulic oil in the flow tube 26 enters the support tube 32 through the U-shaped tube 31. A movable tube 33 is slidably installed in the inner cavity of the support tube 32. An inflow hole 34 is opened in the middle of the horizontal end face of the movable tube 33 near the support tube 32. The hydraulic oil entering the support tube 32 will enter the movable tube 33 through the inflow hole 34. Only after the hydraulic oil fills the movable tube 33 can the movable tube 33 be pushed to move within the support tube 32.

[0044] Then, a piston rod 35 is slidably installed in the inner cavity of the movable tube 33. The arc-shaped surface of the piston rod 35 is tightly attached to the inner cavity of the movable tube 33, and the piston rod 35 and the movable tube 33 form a piston. When hydraulic oil enters the movable tube 33, it will push the piston rod 35 to move. A fixed wheel 37 is provided at the end of the piston rod 35 away from the support tube 32. The device is fixed by contacting the truss through the fixed wheel 37. At the same time, it works with the two rotating rollers 11 located on the front side to allow the device to move better. A spring spring 36 is fixedly installed between the fixed wheel 37 and the movable tube 33. The spring spring 36 has a force that always pushes the fixed wheel 37, which can ensure that the piston rod 35 and the fixed wheel 37 always remain horizontal.

[0045] Specifically, the hydraulic oil in the flow pipe 26 enters the support pipe 32 through the U-shaped pipe 31. The hydraulic oil entering the support pipe 32 enters the inner cavity of the movable pipe 33 through the inlet hole 34, and then pushes the piston rod 35 and the fixed wheel 37 to move. When the fixed wheel 37 contacts the truss, the hydraulic oil in the support pipe 32 can squeeze the hydraulic oil in the movable pipe 33 into the support pipe 32 when pushing the movable pipe 33 to move, so that the fixed wheel 37 will not damage the surface of the truss.

[0046] It should be noted that when the fixed wheel 37 is moved by hydraulic pressure, a large force is generated, which can easily damage the truss. The structure of the clamping mechanism 3 can reduce the damage to the truss caused by the fixed wheel 37 and can also adapt to trusses of different sizes.

[0047] To further explain, in order to support the device when it is not fixed, such as... Figure 6 and Figure 7As shown, the support mechanism 4 includes a telescopic rod 41, which is fixedly installed on the upper inner wall of the housing 1. A housing 42 is fixedly installed at the lower end of the telescopic rod 41. A support plate 43 is fixedly installed in the inner cavity of the housing 1 on the lower side of the housing 42. A support base 44 is slidably installed in the inner cavity of the support plate 43. When the device is not fixed, it will be supported by the support base 44 to ensure that the device remains stable when fixed. When the support base 44 no longer contacts the truss surface, the device can move.

[0048] Then, a connecting pipe 45 is fixedly installed on the upper end of the support base 44. The connecting pipe 45 passes through the upper inner wall of the support plate 43 and is connected to the outer shell 42. A rack 46 is fixedly installed on the lower surface of the telescopic rod 41. When the telescopic rod 41 extends or retracts, it can drive the support base 44 to move through the connecting pipe 45, and at the same time drive the rack 46 to move.

[0049] Specifically, when the telescopic rod 41 is activated and retracted, the output end of the telescopic rod 41 will drive the outer shell 42 to move upward. The outer shell 42 will drive the support base 44 to move through the two connecting pipes 45. The support base 44 will then be unable to contact the truss surface. At this time, the device can be moved by rotating the roller 11. At the same time, the telescopic rod 41 will also drive the rack 46 to move.

[0050] The specific implementation of this embodiment is as follows: The entire device is suspended on the truss surface by the lifting ring 5. At this time, the support base 44 will support the device so that the device can maintain a horizontal state. The cylinder 22 is started, which pushes the piston plate 23 to move. The piston plate 23 will push the hydraulic oil in the hydraulic tank 21 to flow. The hydraulic oil will enter the control box 25 through the connecting box 24. The hydraulic oil in the control box 25 will enter the U-shaped pipe 31 through two flow pipes 26.

[0051] The hydraulic oil in the flow pipe 26 will enter the support pipe 32 through the U-shaped pipe 31. The hydraulic oil entering the support pipe 32 will enter the inner cavity of the movable pipe 33 through the inlet hole 34, and then push the piston rod 35 and the fixed wheel 37 to move. When the fixed wheel 37 contacts the truss, the hydraulic oil in the support pipe 32 can squeeze the hydraulic oil in the movable pipe 33 into the support pipe 32 when pushing the movable pipe 33 to move, so that the fixed wheel 37 will not damage the surface of the truss.

[0052] Once the device is fixed in place, activate the telescopic rod 41 to retract it. The output end of the telescopic rod 41 will drive the outer casing 42 to move upward. The outer casing 42 will drive the support base 44 to move through the two connecting pipes 45. The connecting pipes 45 will no longer be able to contact the truss surface. Activating the motor 12 will drive the two rotating rollers 11 to rotate, so that the two rotating rollers 11 located on the front side will drive the entire device to move. Example

[0053] This embodiment is a further improvement on the control box 25 based on the first embodiment, so that the device can be fixed behind the truss and the position and height of the detection device 28 can be controlled by the cylinder 22, which facilitates the detection of the alignment holes of the truss.

[0054] To further explain, in order to adjust the height of the detection device 28 without affecting its normal fixing function, such as... Figure 8 As shown, the control box 25 includes a box body 251. Both ends of the box body 251 have outflow holes 252. The hydraulic oil in the box body 251 enters the flow pipe 26 through the outflow holes 252. Threaded rods 253 are rotatably installed on the inner walls of both sides of the box body 251. The surfaces of the two threaded rods 253 are provided with L-shaped plates 254. When the threaded rods 253 rotate, they can drive the L-shaped plates 254 to move. When the L-shaped plates 254 overlap, the hydraulic oil cannot enter the telescopic pipe 27. Three meshing bevel gears 255 are provided between the two threaded rods 253. The bevel gears 255 on the left and right sides are respectively connected to the two threaded rods 253.

[0055] Then, a support shaft 256 is fixedly installed at the rear end of the second bevel gear 255 located on the rear side. Two meshing transmission gears 257 are provided on the rear side of the housing 251. The transmission gear 257 located on the upper side is connected to the support shaft 256. The upper end of the L-shaped plate 254 is not tightly attached to the upper inner wall of the housing 251. The rack 46 meshes with the transmission gear 257 located on the lower side. When the rack 46 moves, it can drive the transmission gear 257 located on the lower side to rotate. When the two transmission gears 257 rotate, they can drive the threaded rods 253 on the left and right sides to rotate through the second bevel gear 255.

[0056] The specific implementation of this embodiment is as follows: When the rack 46 moves, it can drive the transmission gear 257 located on the lower side to rotate. The two transmission gears 257 will rotate simultaneously, and then drive the three meshing bevel gears 255 to rotate through the support shaft 256. The bevel gears 255 will drive the two threaded rods 253 to rotate. The rotation of the threaded rods 253 can drive the L-shaped plate 254 to move in the opposite direction. When the two L-shaped plates 254 move to coincide with the inner wall of the box 251, they will block the outflow hole 252, so that the hydraulic oil in the box 251 cannot enter the flow pipe 26.

[0057] When the cylinder 22 is restarted to push the piston plate 23 to move, the hydraulic oil in the housing 251 will enter the telescopic tube 27, controlling the detection device 28 to move up and down to detect the alignment holes at different heights of the truss.

[0058] It should be noted that the specific installation methods, circuit connection methods, and control methods of the motor 12, cylinder 22, and telescopic rod 41 in this invention are all conventional designs, and will not be described in detail in this invention.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A truss gap detection tool comprising a housing (1), characterised in that: The housing (1) has a detection mechanism (2) in the middle of its inner cavity. The housing (1) has clamping mechanisms (3) fixedly installed at both the left and right ends. The detection mechanism (2) has a support mechanism (4) on its rear side. The housing (1) has a lifting ring (5) fixedly installed at the middle of its upper end. The housing (1) has two rotating rollers (11) at both the front and rear ends. The detection mechanism (2) includes a hydraulic tank (21), a cylinder (22) fixedly installed at the rear end of the housing (1) is provided on the rear side of the hydraulic tank (21), a piston plate (23) is provided in the inner cavity of the hydraulic tank (21), the piston plate (23) is fixedly connected to the output end of the cylinder (22), a connecting box (24) is fixedly installed on the upper end of the hydraulic tank (21), a control box (25) is fixedly installed on the upper end of the connecting box (24), flow pipes (26) are fixedly installed on both the left and right ends of the control box (25), a telescopic pipe (27) is fixedly installed on the front end of the control box (25), and a detection device (28) is fixedly installed on the lower end of the telescopic pipe (27). The control box (25), the hydraulic tank (21), and the connecting box (24) are all interconnected. The control box (25) includes a box body (251), with outlet holes (252) at both the left and right ends of the box body (251). Threaded rods (253) are rotatably installed on the inner walls of both the left and right sides of the box body (251). L-shaped plates (254) are provided on the surfaces of the two threaded rods (253). Three meshing bevel gears (255) are provided between the two threaded rods (253). The bevel gears (255) on the left and right sides are respectively connected to the two threaded rods (253). A support shaft (256) is fixedly installed at the rear end of the bevel gear (255) on the rear side. Two meshing transmission gears (257) are provided on the rear side of the box body (251). The transmission gear (257) on the upper side is connected to the support shaft (256). The upper end of the L-shaped plate (254) is not tightly fitted to the upper inner wall of the box body (251). The clamping mechanism (3) includes a U-shaped tube (31), which is connected to the flow tube (26) located on the same side. A support tube (32) is fixedly installed on the lower horizontal end face of the U-shaped tube (31). A movable tube (33) is slidably installed in the inner cavity of the support tube (32). An inflow hole (34) is opened in the middle of the horizontal end face of the movable tube (33) near the support tube (32). A piston rod (35) is slidably installed in the inner cavity of the movable tube (33). A fixed wheel (37) is provided at the end of the piston rod (35) away from the support tube (32). A spring spring (36) is fixedly installed between the fixed wheel (37) and the movable tube (33). The support mechanism (4) includes a telescopic rod (41), which is fixedly installed on the upper inner wall of the housing (1). A rack (46) is fixedly installed on the lower surface of the telescopic rod (41). The telescopic rod (41) drives the support base (44) to rise and fall. The rack (46) meshes with the transmission gear (257) located on the lower side. The outflow hole (252) is connected to the flow pipe (26). When the threaded rod (253) rotates, it can drive the L-shaped plate (254) to move in the opposite direction. When the two L-shaped plates (254) move to coincide with the inner wall of the box (251), they block the outflow hole (252), and the hydraulic oil in the box (251) cannot enter the flow pipe (26). When the two L-shaped plates (254) coincide, the hydraulic oil cannot enter the telescopic pipe (27).

2. The truss gap detection tool of claim 1, wherein: The two rotating rollers (11) located on the front side are provided with connecting shafts (13) at their close ends. A motor (12) is fixedly installed between the two rotating rollers (11) located on the front side and mounted on the front end of the housing (1). Three meshing bevel gears (14) are provided on the lower side of the motor (12). The bevel gear (14) located on the upper side is connected to the output end of the motor (12). The bevel gears (14) located on the left and right sides are respectively connected to the two connecting shafts (13).

3. The truss clearance detection fixture according to claim 1, characterized in that: The rear arc-shaped surface of the piston rod (35) fits tightly against the inner cavity of the movable tube (33).

4. The truss clearance detection fixture according to claim 1, characterized in that: The lower end of the telescopic rod (41) is fixedly installed with a housing (42). The lower side of the housing (42) is provided with a support plate (43) fixedly installed in the inner cavity of the housing (1). The inner cavity of the support plate (43) is slidably installed with a support base (44). The upper end of the support base (44) is fixedly installed with a connecting pipe (45). The connecting pipe (45) passes through the upper inner wall of the support plate (43) and is connected to the housing (42).

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