A road slope measuring instrument

Abstract

This invention relates to the field of slope measurement technology and discloses a road slope measuring instrument, including a movable base, a support mechanism, and an inclination measuring mechanism. The support mechanism includes a rotating seat disposed on the side of the movable base, a rotating sleeve rotatably connected to the rotating seat, and an angle locking device for fixing the angle of the rotating sleeve inside the rotating seat. A telescopic cantilever is slidably connected to the side of the rotating sleeve away from the rotating seat, and a sliding sleeve perpendicular to the movable base is disposed at the end of the telescopic cantilever. A sliding rod is slidably connected to the side of the sliding sleeve closest to the ground, and a traveling wheel is disposed at the end of the sliding rod. The inclination measuring mechanism includes a positioning bracket fixedly connected to the movable base. This invention, by setting a pressure balancing component, ensures that the four traveling wheels of the measuring instrument remain in contact with the ground during movement, allowing continuous slope detection during the movement of the movable base, thus improving the efficiency of slope detection.

Description

Technical Field

[0001] The invention relates to the technical field of slope measurement, in particular to a road surface slope measuring instrument. Background Art

[0002] The road slope needs to be measured during road construction. The more common measurement methods include the combined measurement method of laser rangefinder and inclinometer and the combined measurement method of level and theodolite. The laser rangefinder is used to measure the straight-line distance between two points, and the inclinometer is used to measure the angle between the road surface and the horizontal direction. The road slope is calculated through trigonometric function relationships. The level is used to measure the height difference between two points, and the theodolite is used to measure the horizontal angle between two points. The road slope is calculated by combining the data measured by the two. In other words, these two measurement methods can only measure the slope of two separate points.

[0003] However, when measuring the slope of a road surface, the slope of the road surface will change at different locations. If the conventional two-point measurement method is used, it is necessary to measure the slope at multiple points on the road surface. In other words, the measuring equipment needs to be fixed and measured at different target points, which makes the entire measurement process more cumbersome and needs to be improved. Summary of the invention

[0004] The present invention provides a road surface slope measuring instrument, which solves the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A road slope measuring instrument comprises a mobile base, a supporting mechanism and an inclination measuring mechanism; the supporting mechanism comprises a rotating seat arranged on the side of the mobile base, the rotating seat is rotatably connected to a rotating sleeve, an angle locking device for fixing the angle of the rotating sleeve is arranged inside the rotating seat, a telescopic cantilever is slidably connected to the side of the rotating sleeve away from the rotating seat, the extension lengths of different telescopic cantilevers are the same, a sliding sleeve is arranged at the end of the telescopic cantilever vertically arranged to the mobile base, a sliding rod is slidably connected to the side of the sliding sleeve close to the ground, a walking wheel is arranged at the end of the sliding rod, a displacement detection sensor for detecting the moving distance of the sliding rod is arranged on the sliding sleeve, the sliding sleeve is a hollow structure, and the sliding rod is in the sliding sleeve The movable base slides in the internal cavity, and a pressure balancing component for maintaining the same pressure in all the sliding sleeve cavities is arranged in the middle of the movable base; the inclination measuring mechanism comprises a positioning bracket fixedly connected to the movable base, a supporting disk is arranged in the middle of the positioning bracket, a main shaft is rotatably connected to the supporting disk, a rotating arm that rotates synchronously with the main shaft and is arranged parallel to the movable base is arranged at the end of the main shaft, a rotating head is arranged at the end of the rotating arm away from the main shaft, the rotating head is rotatably connected to one end of a deflection rod, and a counterweight is fixedly connected to the other end of the deflection rod, and angle detection sensors are arranged inside the rotating head and between the main shaft and the supporting disk, and the angle detection sensor is used to detect the rotation angle of the rotating arm and the deflection rod.

[0007] As a preferred technical solution of the present invention, a rotating shaft is rotatably connected to the rotating seat, a winding roller is fixedly connected to the rotating shaft, a tension rope is wound around the outside of the winding roller, and the end of the tension rope is connected to a sliding sleeve. The sides of the rotating sleeve and the telescopic cantilever are both provided with fixed plates, and a reset spring is provided between the two fixed plates to drive the telescopic cantilever to move in a direction away from the rotating seat. The fixed plate on the telescopic cantilever is fixedly connected to the end of the guide rod, and the middle of the guide rod is slidably connected to the fixed plate provided on the rotating sleeve. A driven pulley is provided at the end of the rotating shaft, and an extension frame is provided on the side of the mobile base, and the extension frame is rotatably connected to a driving pulley, and the driving pulley is connected to the driven pulley through a synchronous rotating belt.

[0008] As a preferred technical solution of the present invention, the pressure balancing assembly includes a water tank arranged in the middle of the mobile base, a water outlet is arranged on the side of the side wall of the water tank away from the mobile base, a guide piston fixedly connected to the end of the sliding rod is slidably connected inside the sliding sleeve, a water inlet is arranged on the side wall of the sliding sleeve, the water inlet is connected to the water outlet through a high-pressure hose, hydraulic oil is injected into the internal cavity of the sliding sleeve and the water tank, and the hydraulic oil flows freely between the sliding sleeve and the water tank through the high-pressure hose. A lifting piston is slidably connected to the middle of the water tank, a water supply port and an exhaust port are arranged on both sides of the lifting piston, the water supply port and the water outlet are located on the same side of the lifting piston, a lifting slide rod slidably connected to the water tank is arranged on the lifting piston, a lifting slide rod fixedly connected to the end of the lifting slide rod away from the water tank is fixedly connected to a lifting bracket, and a lifting screw rod rotatably connected to the outer wall of the water tank is threadedly connected to the middle of the lifting bracket.

[0009] As a preferred technical solution of the present invention, the end of the spindle away from the mobile base is fixedly connected to a rotating block, the middle of the rotating block is slidably connected to the rotating arm, and the side of the rotating block is threadedly connected to a locking bolt that limits the movement of the rotating arm. A limit plate is provided at the end of the spindle close to the mobile base, and a support wheel that cooperates with the limit plate is provided on the support plate.

[0010] The present invention has the following benefits:

[0011] By setting up a pressure balance component, the four walking wheels of the measuring instrument always keep in contact with the ground during the movement, and the angle between the mobile base and the horizontal plane is measured by the displacement detection sensor and the angle detection sensor, so as to obtain the slope of the ground. In other words, the slope of the ground can be continuously detected during the movement of the mobile base, thereby improving the efficiency of slope detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 The present invention is a structural schematic diagram of a road slope measuring instrument.

[0014] Figure 2 The present invention is a front view of a road slope measuring instrument.

[0015] Figure 3 The present invention is a structural schematic diagram of a supporting mechanism in a road surface slope measuring instrument.

[0016] Figure 4 for Figure 3 A is a partial enlarged schematic diagram of the middle part.

[0017] Figure 5 The present invention is a schematic diagram of the structure of the cooperation between a rotating sleeve and a telescopic cantilever in a road slope measuring instrument.

[0018] Figure 6 The present invention is a schematic diagram of the structure inside a sliding sleeve in a road slope measuring instrument.

[0019] Figure 7 The present invention is a schematic diagram of the structure inside a water tank in a road slope measuring instrument.

[0020] Figure 8 The present invention is a structural schematic diagram of an inclination angle measuring mechanism in a road surface slope measuring instrument.

[0021] Fig. 9 for Figure 8 Right view of .

[0022] Fig.10 The present invention is a schematic diagram of the structure of a road slope measuring instrument after being folded.

[0023] In the figure: 1. mobile base; 2. support mechanism; 3. inclination measuring mechanism; 4. rotating seat; 5. rotating sleeve; 6. telescopic cantilever; 7. sliding sleeve; 8. sliding rod; 9. walking wheel; 10. displacement detection sensor; 11. pressure balance assembly; 12. winding roller; 13. tension rope; 14. driven pulley; 15. rotating shaft; 16. synchronous rotating belt; 17. extension frame; 18. driving pulley; 19. fixing plate; 20. guide rod; 21. return spring; 22. guide piston; 23. High-pressure hose; 24. Water inlet; 25. Water storage tank; 26. Exhaust port; 27. Lifting piston; 28. Water supply port; 29. ​​Water outlet; 30. Lifting slide rod; 31. Lifting bracket; 32. Lifting screw rod; 33. Positioning bracket; 34. Support plate; 35. Spindle; 36. Angle detection sensor; 37. Rotating block; 38. Locking bolt; 39. Rotating arm; 40. Deflection rod; 41. Rotating head; 42. Counterweight block; 43. Support wheel; 44. Limit plate; 45. Traction connector. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In one embodiment, see Figure 1-Figure 10, a road surface slope measuring instrument, comprising a mobile base 1, a supporting mechanism 2 and an inclination measuring mechanism 3;

[0026] The supporting mechanism 2 includes a rotating seat 4 arranged on the side of the mobile base 1. The mobile base 1 is a square structure. The rotating seats 4 are vertically arranged at the four corners of the upper surface of the mobile base 1. The rotating seat 4 is rotatably connected to the end of the rotating sleeve 5. The rotating sleeve 5 is slidably connected to a telescopic cantilever 6 on the side away from the mobile base 1. The end of the telescopic cantilever 6 is fixedly connected to a vertically arranged sliding sleeve 7. A sliding rod 8 is slidably connected to the bottom of the sliding sleeve 7. A walking wheel 9 is arranged at the lower end of the sliding rod 8. The walking wheel 9 is a universal wheel structure, so that the entire measuring instrument can be moved on the ground through the four walking wheels 9. The extension and contraction of the four telescopic cantilevers 6 are synchronous and the lengths are the same. An angle locking device is arranged inside the rotating seat 4, so that when the rotating sleeve 5 is rotated to the target angle, the fixing of the rotating sleeve 5 can be achieved through the angle locking device. Therefore, the spacing between the four walking wheels 9 can be controlled by changing the angle of the rotating sleeve 5 and the extension length of the telescopic cantilever 6, thereby avoiding a some obstacles, so that the entire measuring instrument can walk on roads of different widths, and in order to facilitate subsequent calculations, the angles of the four rotating sleeves 5 can be set to be the same, and a displacement detection sensor 10 is set at the upper end of the sliding sleeve 7, and the extended end of the displacement detection sensor 10 is connected to the sliding rod 8, so the displacement detection sensor 10 can measure the moving distance of the sliding rod 8 inside the sliding sleeve 7, and a pressure balance component 11 is set in the middle of the upper surface of the mobile base 1. The pressure balance component 11 makes the pressure of the four support wheels 43 on the ground fixed, so when the entire measuring instrument is moving, if a certain walking wheel 9 has a concave or convex road surface at the landing point, the walking wheel 9 will be adaptively adjusted in height, and the other walking wheels 9 will also be adaptively adjusted in height, so that the four support wheels 43 always keep in contact with the ground, so that the data detected by the four displacement detection sensors 10 are true;

[0027] The inclination measuring mechanism 3 includes a positioning bracket 33 fixedly connected to the mobile base 1. The positioning bracket 33 is a U-shaped structure with an opening downward. The lower end of the positioning bracket 33 is fixedly connected to the front and rear sides of the upper surface of the mobile base 1 respectively. A support plate 34 is arranged in the upper middle part of the positioning bracket 33. The support plate 34 is arranged parallel to the mobile base 1. The middle part of the support plate 34 is rotatably connected to a vertically arranged main shaft 35. The upper end of the main shaft 35 is provided with a rotating arm 39 that rotates synchronously with the main shaft 35, and the rotating arm 39 is arranged parallel to the mobile base 1. A rotating head 41 is arranged on the side of the lower surface of the rotating arm 39 away from the main shaft 35. The rotating head 41 is rotatably connected to the upper end of the deflection rod 40. The lower end of the deflection rod 40 is fixedly connected to a counterweight block 42. Therefore, under the action of gravity, the counterweight block 42 will make the rotating arm 39 and the deflection rod 40 adaptable. The rotating arm 39 is rotated, and the direction of the rotating arm 39 is the tilt direction of the measuring instrument. The rotation angle of the deflection rod 40 represents the tilt amplitude of the measuring instrument, so that the operator can more intuitively observe the slope change during the measurement process. In order to obtain accurate values, an angle detection sensor 36 can be set between the main shaft 35 and the support plate 34. This angle detection sensor 36 is used to detect the rotation of the main shaft 35 relative to the support plate 34, that is, to determine which direction the tilt occurs. At the same time, an angle detection sensor 36 for detecting the inclination angle of the deflection rod 40 is set inside the rotating head 41, so that the tilt change of the mobile base 1, that is, the slope change, can be effectively obtained through the two angle detection sensors 36.

[0028] In one case of the present embodiment, a vertically arranged rotating shaft 15 is rotatably connected to the upper end of the rotating seat 4, a winding roller 12 is fixedly connected to the lower part of the rotating shaft 15, a tension rope 13 is wound around the outside of the winding roller 12, the end of the tension rope 13 away from the winding roller 12 is connected to the sliding sleeve 7, and a fixed plate 19 is arranged between the rotating sleeve 5 and the telescopic cantilever 6, a return spring 21 is arranged between the two fixed plates 19, the return spring 21 will push the telescopic cantilever 6 toward the side away from the rotating sleeve 5, and a guide rod 20 is arranged on the fixed plate 19 fixedly connected to the telescopic cantilever 6, the middle part of the guide rod 20 is slidably connected to the fixed plate 19 arranged on the rotating sleeve 5, the return spring 21 is sleeved on the guide rod 20, and a driven pulley 14 is fixedly connected to the upper end of the rotating shaft 15, so that the driven pulley 14 and the winding roller 12 rotate synchronously, and an extension frame 17 is arranged in the middle of the right side of the mobile base 1, and the extension frame 17 is rotatably connected There is a driving pulley 18, which is connected to the driven pulley 14 through a synchronous rotating belt 16, that is to say, the four driven pulleys 14 and one driving pulley 18 are all wrapped inside the synchronous rotating belt 16, and when the driving pulley 18 rotates, the four driven pulleys 14 rotate synchronously, that is to say, the four winding rollers 12 release or retract the tensioning rope 13 synchronously, so that the four telescopic cantilevers 6 can be extended or retracted synchronously, and a locking device is provided on the extension frame 17, so that the angle can be locked after the driving pulley 18 completes the rotation, so that the length of the telescopic cantilever 6 is fixed, and because the tensioning rope 13 is used to pull the telescopic cantilever 6 to move, when the walking wheel 9 encounters an obstacle, the telescopic cantilever 6 can overcome the elastic force of the reset spring 21 and contract, and the tensioning rope 13 will be in a relaxed state, so that the walking wheel 9 can avoid the obstacle, thereby improving the passability of the entire measuring instrument.

[0029] In one case of the present embodiment, the pressure balancing assembly 11 includes a water tank 25 arranged in the middle of the upper surface of the mobile base 1. The water tank 25 is a cylindrical structure and is hollow inside. Four water outlets 29 are arranged above the side wall of the water tank 25, and the interior of the sliding sleeve 7 is hollow. A guide piston 22 that slides up and down along the internal cavity of the sliding sleeve 7 is arranged at the upper end of the sliding rod 8. A water inlet 24 is arranged above the side wall of the sliding sleeve 7. The water inlet 24 is connected to the water outlet 29 through a high-pressure hose 23. That is to say, the cavity inside the sliding sleeve 7 and the cavity inside the water tank 25 are in a conductive state. At this time, hydraulic oil can be injected into the water tank 25 to discharge the hydraulic oil. This has the effect of transmitting pressure, so that the hydraulic oil can flow in the internal cavity of the four sliding sleeves 7, that is to say, the pressure of the hydraulic oil on the guide piston 22 is the same, so that the downward pressure of the guide piston 22 on the sliding rod 8 is the same, so that the pressure of the walking wheel 9 along the axis of the sliding rod 8 is the same. When the measuring instrument is moving, if the walking wheel 9 encounters a raised or recessed road surface, the walking wheel 9 will adaptively adjust the height. At this time, due to the flow of hydraulic oil inside, the other three walking wheels 9 will also adaptively compensate for the height, so that the four walking wheels 9 always remain in contact with the ground.

[0030] In one case of the present embodiment, a lifting piston 27 is slidably connected inside the water tank 25, and a water filling port 28 and an exhaust port 26 are respectively provided on the upper and lower sides of the side wall of the water tank 25. The water filling port 28 is located above the lifting piston 27, and the exhaust port 26 is located below the lifting piston 27. The hydraulic oil is located above the lifting piston 27, so the water filling port 28 is used to replenish or replace the hydraulic oil inside the water tank 25, and the exhaust port 26 below is to facilitate the airflow in the space below the lifting piston 27 to maintain the same state as the external atmospheric pressure, so as to facilitate the up and down movement of the lifting piston 27. When the lifting piston 27 moves upward, the space above the lifting piston 27 in the water tank 25 is reduced, that is, the volume of the hydraulic oil that can be retained in the water tank 25 is reduced. At this time, the hydraulic oil in the sliding sleeve 7 increases, thereby extending the sliding rod 8. On the contrary, if the lifting piston 27 moves downward After the movement, the volume of hydraulic oil that can be retained in the water tank 25 increases. At this time, the sliding rod 8 will shrink back into the sliding sleeve 7, thereby achieving the effect of synchronous expansion and contraction of the four sliding rods 8. A lifting slide rod 30 is vertically arranged on the upper surface of the lifting piston 27. The middle part of the lifting slide rod 30 is slidably connected to the top of the water tank 25. The upper end of the lifting slide rod 30 is fixedly connected to the lifting bracket 31. The middle part of the lifting bracket 31 is threadedly connected with a vertically arranged lifting screw rod 32. The lower end of the lifting screw rod 32 is rotatably connected to the upper surface of the water tank 25. Therefore, the rotation of the lifting screw rod 32 can control the up and down movement of the lifting bracket 31, so that the lifting slide rod 30 drives the lifting piston 27 to move up and down, and due to the self-locking nature of the thread, after the operator completes the rotation of the lifting screw rod 32, during normal work, the lifting screw rod 32 will not rotate, thereby fixing the height of the lifting piston 27.

[0031] In one case of this embodiment, the upper end of the main shaft 35 is fixedly connected to the rotating block 37, the middle part of the rotating block 37 is slidably connected to the rotating arm 39, and the side of the rotating block 37 is threadedly connected with a locking bolt 38 that limits the movement of the rotating arm 39. Therefore, after loosening the locking bolt 38, the rotating arm 39 can be pulled out, thereby increasing the rotation radius of the deflection rod 40, making it easier for the counterweight 42 to drive the rotating arm 39 to rotate. The lower end of the main shaft 35 is fixedly connected to the limit plate 44, and a support wheel 43 is provided below the support plate 34. The support wheel 43 can roll on the limit plate 44, so that the main shaft 35 can maintain the effect of vertical rotation through the cooperation of the support wheel 43 and the limit plate 44, thereby improving the subsequent measurement accuracy.

[0032] During the implementation of this embodiment, the measuring instrument is transported to the site where the slope needs to be measured by means of transportation equipment, the measuring instrument is placed on the ground, and the lifting screw 32 is rotated to make the lifting piston 27 move upward. At this time, the sliding rod 8 extends downward, and the walking wheel 9 lifts up the mobile base 1. At this time, the direction of the rotating sleeve 5 is adjusted according to the road surface to be moved to. After the adjustment of the rotating sleeve 5 is completed, the direction of the rotating sleeve 5 is fixed by the angle locking device, and the driving pulley 18 is rotated, the winding roller 12 releases the tensioning rope 13, and the telescopic cantilever 6 is extended. When the spacing of the walking wheels 9 meets the requirements, the driving pulley 18 is stopped, the locking bolt 38 is loosened, and the rotating arm 39 is pulled out. After the rotating arm 39 is pulled out, the locking bolt 38 is tightened again. A traction connector 45 is set in the middle of the left side of the mobile base 1, and the traction connector 45 is connected to the relevant traction vehicle, and the measuring instrument is ready.

[0033] The traction vehicle drives the measuring instrument to move on the road surface, and the mobile base 1 tilts as the slope of the road surface changes, so that the rotating arm 39 and the deflection rod 40 continue to rotate. The operator observes the change in slope in real time through the angle change of the rotating arm 39 and the deflection rod 40, and the slope change of the road surface can be obtained by inputting the parameters measured by the angle detection sensor 36 and the displacement detection sensor 10 into the calculation software. In addition, since the orientation of the rotating arm 39 can be changed, after the overall position change of the measuring instrument, the angle change of the rotating arm 39 and the deflection rod 40 can be used to obtain the angle change between the mobile base 1 and the horizontal plane. At the same time, the numerical change of the four displacement detection sensors 10 can be used to obtain the angle change between the mobile base 1 and the road surface, thereby calculating the angle change between the road surface and the horizontal plane, and thus obtaining the change in slope. Therefore, the measuring instrument can not only measure the slope along the walking direction, but also measure the slope in the direction perpendicular to the walking direction. That is to say, the entire measuring instrument can measure and process the slope of the entire road surface.

[0034] When the entire measuring instrument has completed its work, first loosen the locking bolt 38, move the deflection rod 40 on the rotating arm 39 toward the direction of the positioning bracket 33, and rotate the rotating arm 39 so that the counterweight 42 can fall on the positioning bracket 33. At this time, the deflection rod 40 can be fixed to the positioning bracket 33 by a strap, and the active pulley 18 is rotated to make the winding roller 12 retract the tensioning rope 13, and the telescopic cantilever 6 retracts into the inside of the rotating sleeve 5. The lifting screw 32 is rotated in the opposite direction, and the lifting piston 27 moves downward, so that the sliding rod 8 retracts into the inside of the sliding sleeve 7. At this time, the walking wheel 9 is disengaged from the ground, and the bottom of the mobile base 1 falls on the ground. At this time, the measuring instrument has completed the folding process and can be transferred by transportation equipment.

[0035] The present invention is applicable to a road slope measuring instrument. By setting a pressure balance component 11, the four running wheels 9 of the measuring instrument always keep in contact with the ground during movement, and the angle between the mobile base 1 and the horizontal plane is measured by the displacement detection sensor 10 and the angle detection sensor 36, so as to obtain the slope of the ground. That is to say, the slope of the ground can be continuously detected during the movement of the mobile base 1, thereby improving the detection efficiency of the slope.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A road slope measuring instrument, characterized in that: It includes a mobile base, a supporting mechanism and an inclination measuring mechanism; The supporting mechanism comprises a rotating seat arranged on the side of the mobile base, the rotating seat is rotatably connected to the rotating sleeve, an angle locking device for fixing the angle of the rotating sleeve is arranged inside the rotating seat, a telescopic cantilever is slidably connected to the side of the rotating sleeve away from the rotating seat, and the extension lengths of different telescopic cantilevers are the same, a sliding sleeve arranged vertically to the mobile base is arranged at the end of the telescopic cantilever, a sliding rod is slidably connected to the side of the sliding sleeve close to the ground, a walking wheel is arranged at the end of the sliding rod, a displacement detection sensor for detecting the moving distance of the sliding rod is arranged on the sliding sleeve, the sliding sleeve is a hollow structure, the sliding rod slides in the internal cavity of the sliding sleeve, and a pressure balancing component for maintaining the same pressure in all sliding sleeve cavities is arranged in the middle of the mobile base; The inclination measuring mechanism comprises a positioning bracket fixedly connected to a mobile base, a support plate is arranged in the middle of the positioning bracket, a main shaft is rotatably connected to the support plate, a rotating arm is arranged at the end of the main shaft, which rotates synchronously with the main shaft and is arranged parallel to the mobile base, a rotating head is arranged at the end of the rotating arm away from the main shaft, the rotating head is rotatably connected to one end of a deflection rod, and a counterweight is fixedly connected to the other end of the deflection rod, and angle detection sensors are arranged inside the rotating head and between the main shaft and the support plate, and the angle detection sensor is used to detect the rotation angle of the rotating arm and the deflection rod.

2. A road slope measuring instrument according to claim 1, characterized in that: The rotating seat is rotatably connected to a rotating shaft, the rotating shaft is fixedly connected to a winding roller, a tensioning rope is wound around the outside of the winding roller, the end of the tensioning rope is connected to a sliding sleeve, fixed plates are provided on the sides of the rotating sleeve and the telescopic cantilever, a return spring is provided between the two fixed plates for driving the telescopic cantilever to move away from the rotating seat, the fixed plate on the telescopic cantilever is fixedly connected to the end of the guide rod, and the middle part of the guide rod is slidably connected to the fixed plate provided on the rotating sleeve.

3. A road slope measuring instrument according to claim 2, characterized in that: A driven pulley is arranged at the end of the rotating shaft, and an extension frame is arranged at the side of the movable base. The extension frame is rotatably connected to a driving pulley, and the driving pulley is connected to the driven pulley through a synchronous rotating belt.

4. A road slope measuring instrument according to claim 1, characterized in that: The pressure balancing assembly includes a water tank arranged in the middle of the mobile base, a water outlet is arranged on the side wall of the water tank away from the mobile base, a guide piston fixedly connected to the end of the sliding rod is slidably connected inside the sliding sleeve, a water inlet is arranged on the side wall of the sliding sleeve, the water inlet is connected to the water outlet through a high-pressure hose, hydraulic oil is injected into the internal cavity of the sliding sleeve and the water tank, and the hydraulic oil flows freely between the sliding sleeve and the water tank through the high-pressure hose.

5. A road slope measuring instrument according to claim 4, characterized in that: A lifting piston is slidably connected to the middle part of the water tank, and a water supply port and an exhaust port are respectively provided on both sides of the lifting piston. The water supply port and the water outlet are located on the same side of the lifting piston. A lifting slide rod slidably connected to the water tank is provided on the lifting piston, and a lifting bracket is fixedly connected to the end of the lifting slide rod away from the water tank. The middle part of the lifting bracket is threadedly connected to a lifting screw rod rotatably connected to the outer wall of the water tank.

6. A road slope measuring instrument according to claim 1, characterized in that: One end of the main shaft away from the moving base is fixedly connected with a rotating block, the middle part of the rotating block is slidably connected with a rotating arm, and the side surface of the rotating block is threadedly connected with a locking bolt for limiting the movement of the rotating arm.

7. A road slope measuring instrument according to claim 6, characterized in that: A limiting disk is arranged at one end of the main shaft close to the movable base, and a supporting wheel cooperating with the limiting disk is arranged on the supporting disk.

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