A precision rotation mechanism for a vehicle-mounted wheeled lifting mast and its usage method

Abstract

This invention belongs to the field of lifting mast technology, specifically relating to a precision rotation mechanism and method for a vehicle-mounted wheeled lifting mast. It includes a wheeled chassis assembly and a mast lifting mechanism mounted at its top center via an adjustment mechanism. The mast lifting mechanism is rotatably connected to the wheeled chassis assembly. A mast assembly is mounted on the mast lifting mechanism, and an operating platform is mounted on the mast assembly. The adjustment mechanism includes a rotation component for rotating the mast lifting mechanism and a drive component for driving the rotation component. The drive component includes a support plate. This invention effectively slows down the turning speed of the mast lifting mechanism through the adjustment mechanism, thereby achieving more precise positioning and position adjustment. This is crucial for tasks requiring high-precision positioning, such as measurement, imaging, and positioning work. Furthermore, it reduces the influence of inertial forces and motion instability, meeting the requirements of high precision and high controllability.

Description

Technical Field

[0001] This invention belongs to the field of lifting mast technology, specifically relating to a precision rotation mechanism and its usage method for a vehicle-mounted wheeled lifting mast. Background Technology

[0002] Vehicle-mounted wheeled lifting masts are widely used in various applications, including construction sites, photoelectric detection, and telecommunications maintenance. They can raise and lower an operating platform to a certain height for high-precision positioning tasks, such as measurement, imaging, and positioning, which are crucial for these tasks. Various equipment, such as cameras, measuring devices, or other equipment, can be mounted on the operating platform. To enable the operating platform to turn in different directions, a steering mechanism needs to be installed at the top of the mast to adjust the platform's angle.

[0003] Currently, there are two main types of rotation mechanisms used in existing vehicle-mounted wheeled lifting masts: one is the direct drive type, in which the electric motor directly drives the mast to rotate, and the other is the indirect drive type, in which the electric motor drives the mast to rotate through a transmission chain.

[0004] The advantages of direct-drive indexing mechanisms are simple structure and high transmission efficiency, but the disadvantages are that the power and torque of the motor are relatively large, resulting in high energy consumption. Furthermore, due to mechanical inertia and the lack of braking devices, the rotation cannot be stopped in time when the target position is reached, causing positional deviation.

[0005] The advantages of indirect drive type indexing mechanism are that the power and torque of the motor are relatively small, saving energy, and it can stop rotating quickly when the target position is reached. However, the disadvantages are that the structure is complex, the transmission efficiency is low, and there are problems such as transmission error and mechanical backlash.

[0006] Therefore, the current indexing mechanisms used for vehicle-mounted wheeled lifting masts all have certain defects and cannot meet the requirements of high precision and high controllability. Summary of the Invention

[0007] The purpose of this invention is to provide a precision rotation mechanism and method for using a vehicle-mounted wheeled lifting mast, which enables the vehicle-mounted wheeled lifting mast to achieve more precise positioning and position adjustment, meeting the requirements of high precision and high controllability.

[0008] The specific technical solution adopted by this invention is as follows:

[0009] A precision rotation mechanism for a vehicle-mounted wheeled lifting mast includes a wheeled chassis assembly and a mast lifting mechanism mounted at the top center of the chassis via an adjustment mechanism. The mast lifting mechanism is rotatably connected to the wheeled chassis assembly. A mast assembly is mounted on the mast lifting mechanism, and an operating platform is mounted on the mast assembly. The adjustment mechanism includes a rotation component for rotating the mast lifting mechanism and a drive component for driving the rotation component. The drive component includes a support plate, which is fixed to one end of the top of the wheeled chassis assembly. A first transmission rod is rotatably connected inside the support plate, and the first transmission rod passes through the interior of a base and is rotatably connected to the base. A first bevel gear is fixed to the end of the first transmission rod away from the support plate, and the first bevel gear is located inside the base. A second bevel gear is meshed with the bottom of the outer side of the first bevel gear, and a second transmission rod is fixed inside the second bevel gear. The second transmission rod is rotatably connected to the wheeled chassis assembly. A second rectangular strip is fixed to the outer side of the first transmission rod near the support plate, and a circular plate is movably connected to the outer side of the second rectangular strip.

[0010] The drive assembly further includes a positioning assembly. A plurality of first rectangular bars are fixed on the outer side of the first transmission rod and near the outer side of the base. A hydraulic cylinder is installed on the outer side of the base, and an arc-shaped plate is fixed to the output end of the hydraulic cylinder. An elastic plate is installed on the side of the arc-shaped plate near the first rectangular bars.

[0011] A partition is installed inside the base and near the top, and the partition divides the interior of the base into a limiting groove and an installation groove.

[0012] The limiting groove is located above the partition, the mounting groove is located below the partition, and the indexing assembly is located inside the mounting groove.

[0013] The indexing assembly includes three gear assemblies, all of which are located inside the mounting slots on the base. The three gear assemblies are arranged vertically, and each gear assembly includes a toothed ring, which is rotatably connected to the base.

[0014] The gear ring is internally connected to three second gear bodies, and a first gear body is connected to the center of the three second gear bodies. One of the first gear bodies at the bottom position is fixedly connected to the second transmission rod. A connecting frame is provided on the top of each of the three second gear bodies. Three connecting rods are rotatably connected to the bottom of the connecting frame, and the three connecting rods are rotatably connected to the three second gear bodies respectively.

[0015] A transmission column is fixed to the top of each of the two connecting frames below, and the two transmission columns are respectively fixedly connected to the bodies of the two first gears above them;

[0016] A connecting column is fixed to the top of one of the upper connecting frames, and the connecting column is vertically upward and passes through the partition to connect with the second rotating ring, and the connecting column is rotatably connected to the partition.

[0017] A first rotating ring is fixed to the outer side of the toothed ring, and a rotating groove adapted to the first rotating ring is opened inside the base. The first rotating ring is located inside the rotating groove on the base.

[0018] The circular plate has a circular sliding hole inside that is adapted to the first transmission rod, and the first transmission rod is located inside the circular sliding hole on the circular plate. The circular plate also has a rectangular groove inside that is adapted to the second rectangular strip.

[0019] The rectangular grooves are three in number. A handle is fixed to the outside of the circular plate. A bearing plate is fixed to the top of the support plate. Multiple elastic retaining rings adapted to the handle are installed on the side of the bearing plate near the handle.

[0020] The bottom of the mast lifting mechanism is fixed with a second rotating ring, which is located inside the limiting groove and is rotatably connected to the base.

[0021] A method for using a precision indexing mechanism for a vehicle-mounted wheeled lifting mast, the method being applied to the aforementioned precision indexing mechanism, includes the following steps:

[0022] Step 1: Slide the circular plate to the outside of the second rectangular strip, at which point the second rectangular strip is located inside the rectangular groove;

[0023] Step 2: Rotate the circular plate. Through the cooperation of the second rectangular bar and the rectangular groove, the first transmission rod is driven to rotate. The rotation of the first transmission rod, through the setting of the first bevel gear, the second bevel gear, and the indexing assembly, can make the connecting column rotate.

[0024] Step 3: The rotation of the connecting column, through the second rotating ring, causes the mast lifting mechanism to slowly turn;

[0025] Step 4: Visually observe the rotation angle of the mast lifting mechanism using the measuring plate and scale.

[0026] Step 5: Activate the hydraulic cylinder to bring the elastic plate into contact with the first rectangular bar, thereby positioning the mast lifting mechanism.

[0027] The technical effects achieved by this invention are as follows:

[0028] This invention effectively slows down the turning speed of the mast lifting mechanism through a specially designed adjustment mechanism, thereby achieving more precise positioning and position adjustment. This is crucial for tasks requiring high-precision positioning, such as measurement, imaging, and positioning work. Furthermore, it reduces the impact of inertial forces and motion instability, meeting the requirements for high precision and high controllability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a cross-sectional view of the interior of the base in this invention;

[0031] Figure 3 This is an exploded view of the transposition component in this invention;

[0032] Figure 4 This is an exploded view of the inner component of the toothed ring in this invention;

[0033] Figure 5 This is a schematic diagram illustrating the separation or combination of the arc-shaped plate and the first rectangular strip, and the circular plate and the second rectangular strip in this invention;

[0034] Figure 6 This is a schematic diagram of the driving component in this invention.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. Wheeled chassis assembly; 2. Base; 3. Mast lifting mechanism; 4. Mast assembly; 5. Support plate; 6. First transmission rod; 7. First bevel gear; 8. Second bevel gear; 9. Second transmission rod; 10. First gear body; 11. Second gear body; 12. Connecting rod; 13. Connecting frame; 14. Transmission column; 15. First rotating ring; 16. Connecting column; 17. Hydraulic cylinder; 18. Arc plate; 19. Elastic plate; 20. First rectangular bar; 21. Second rectangular bar; 22. Circular plate; 23. Rectangular groove; 24. Handle; 25. Bearing plate; 26. Elastic retaining ring; 27. Scale plate; 28. Measuring plate; 29. ​​Second rotating ring; 30. Gear ring; 31. Partition plate. Detailed Implementation

[0037] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0038] Example 1:

[0039] like Figure 1-6As shown, a precise rotation mechanism and method for a vehicle-mounted wheeled lifting mast are disclosed. The mechanism includes a wheeled chassis assembly 1 connected to a vehicle tow hook, with a tow plate on the outer side of one end. The tow plate is connected to the tow hook on the vehicle, allowing the wheeled chassis assembly 1 to move with the vehicle during operation. A base 2 is fixed at the top center of the assembly. A mast lifting mechanism 3 is installed inside the top of the base 2 via an adjustment mechanism. A partition 31 is installed inside the base 2 near the top, dividing the interior of the base 2 into a limiting groove and an installation groove. The limiting groove is located above the partition 31, and the installation groove is located below the partition 31. A second rotating ring 29 is fixed at the bottom of the mast lifting mechanism 3. The second rotating ring 29 is located inside the limiting groove and is rotatably connected to the base 2. Therefore, the mast lifting mechanism 3 is rotatably connected to the base 2 via the second rotating ring 29, and the rotation component is located inside the installation groove.

[0040] The mast lifting mechanism 3 is equipped with a mast assembly 4, and the mast assembly 4 is equipped with an operating platform. The operating platform can be equipped with various devices, such as cameras, measuring devices or other devices, to complete specific tasks.

[0041] The aforementioned wheeled chassis assembly 1, mast lifting mechanism 3, mast assembly 4, and operating platform are all existing mature technologies. The mast lifting mechanism 3 enables the mast assembly 4 to be raised and lowered. This specific embodiment will not be described in detail. The core solution of this technical solution lies in the specific structure of the adjustment mechanism.

[0042] The components and working principle of the regulating mechanism are disclosed in detail below:

[0043] It includes a rotation assembly for rotating the mast lifting mechanism 3 and a drive assembly for driving the rotation assembly.

[0044] See attached document Figure 1-4 The indexing assembly includes three gear assemblies, all of which are located inside the mounting slots on the base 2. The three gear assemblies are arranged vertically, and each gear assembly includes a gear ring 30.

[0045] Furthermore, a first rotating ring 15 is fixed to the outer side of the toothed ring 30, and a rotating groove adapted to the first rotating ring 15 is provided inside the base 2. The first rotating ring 15 is located inside the rotating groove on the base 2. Therefore, the toothed ring 30 is rotatably connected to the base 2 through the arrangement of the first rotating ring 15 and the rotating groove.

[0046] The inner side of the gear ring 30 is meshed with three second gear bodies 11, and the center of the three second gear bodies 11 is meshed with a first gear body 10. One of the first gear bodies 10 at the bottom position is fixedly connected to the second transmission rod 9. The top of each of the three second gear bodies 11 is provided with a connecting frame 13. The bottom of the connecting frame 13 is rotatably connected to three connecting rods 12 through bearings, and the three connecting rods 12 are rotatably connected to the three second gear bodies 11 through bearings respectively.

[0047] A transmission column 14 is fixed to the top of each of the two connecting frames 13 below, and the two transmission columns 14 are respectively fixedly connected to the two first gear bodies 10 above them.

[0048] A connecting post 16 is fixed to the top of one of the upper connecting frames 13. The connecting post 16 is vertically upward and passes through the partition 31 to connect with the second rotating ring 29. The connecting post 16 is rotatably connected to the partition 31.

[0049] See attached document Figure 1 , 2 5 and appendix Figure 6 The drive assembly includes a support plate 5, which is fixed to one end of the top of the wheel chassis assembly 1. The support plate 5 is rotatably connected to a first transmission rod 6 through a bearing. The base 2 has a circular through hole adapted to the first transmission rod 6. The first transmission rod 6 passes through the circular through hole on the base 2, and its bearing is rotatably connected to the base 2.

[0050] The first transmission rod 6 is fixed with a first bevel gear 7 at the end away from the support plate 5 and the first bevel gear 7 is located inside the base 2. The bottom of the outer side of the first bevel gear 7 is meshed with a second bevel gear 8, and the second transmission rod 9 is fixed inside the second bevel gear 8. The second transmission rod 9 is rotatably connected to the wheel chassis assembly 1 through a bearing. The outer side of the first transmission rod 6 near the support plate 5 is fixed with a second rectangular bar 21. A circular plate 22 is provided on the outer side of the second rectangular bar 21. A circular through groove adapted to the first transmission rod 6 is opened inside the circular plate 22, and the first transmission rod 6 is located in the circular through groove on the circular plate 22. Therefore, the circular plate 22 and the first transmission rod 6 are slidably connected through the circular through groove. The circular plate 22 is also provided with rectangular grooves 23 adapted to multiple second rectangular bars 21, and the rectangular grooves 23 are connected to the circular through grooves. When the circular plate 22 slides to the outer side of the second rectangular bar 21, the second rectangular bar 21 is located inside one of the rectangular grooves 23.

[0051] The adjustment mechanism also includes a measuring component, which includes a scale plate 27 disposed on the top of the base 2, a measuring plate 28 disposed on the outside of the mast lifting mechanism 3, and the measuring plate 28 being located on top of the scale plate 27.

[0052] See attached document Figure 2and attached Figure 6 The drive assembly also includes a positioning assembly. Multiple first rectangular bars 20 are fixed on the outer side of the first transmission rod 6 and near the outer side of the base 2, and there is a gap between every two first rectangular bars 20.

[0053] Furthermore, a hydraulic cylinder 17 is installed on the outer side of the base 2 and near the top of the first rectangular bar 20. An arc-shaped plate 18 is fixed to the output end of the hydraulic cylinder 17, and an elastic plate 19 is installed on the side of the arc-shaped plate 18 near the first rectangular bar 20.

[0054] See attached document Figure 6 In order to facilitate the rotation of the circular plate 22, a handle 24 is fixed on the outside of the circular plate 22, and three rectangular slots 23 are provided.

[0055] By turning the handle 24, the circular plate 22 can be rotated. When the handle 24 is about to contact the wheel chassis assembly 1, the mast lifting mechanism 3 still needs to be rotated. At this time, the handle 24 can be pushed towards the hydraulic cylinder 17. During the process, the circular plate 22 slides to the position between the first rectangular bar 20 and the second rectangular bar 21 on the outside of the first transmission rod 6. Then, one of the rectangular grooves 23 slides out of the outside of the second rectangular bar 21. At this time, the handle 24 can be turned again to return it to its original position area, and the circular plate 22 can be slid so that the other rectangular groove 23 slides to the outside of the second rectangular bar 21. At this time, the handle 24 can be turned again to make the first transmission rod 6 continue to rotate, so that the mast lifting mechanism 3 can be rotated 360 degrees.

[0056] Referring to 6, a support plate 25 is fixed on the top of the support plate 5, and multiple elastic retaining rings 26 adapted to the handle 24 are installed on the side of the support plate 25 near the handle 24.

[0057] After the mast lifting mechanism 3 has turned, the bearing plate 25 can be slid into the interior of the elastic retaining ring 26. At this time, it can be fixed by the elastic retaining ring 26 to reduce the sliding and shaking of the bearing plate 25.

[0058] Example 2:

[0059] Based on Embodiment 1, this embodiment specifically discloses a method for using a precision indexing mechanism for a vehicle-mounted wheeled lifting mast:

[0060] See attached document Figure 1-6 The method includes the following steps:

[0061] Firstly, when it is necessary to turn the mast lifting mechanism 3, the sliding circular plate 22 can be slid outside the first transmission rod 6 and then slid outside the second rectangular bar 21, so that the second rectangular bar 21 is located inside one of the rectangular slots 23.

[0062] Secondly: by rotating the circular plate 22, the first transmission rod 6 can be driven to rotate when the circular plate 22 is rotated by the setting of the rectangular groove 23 and the second rectangular bar 21.

[0063] The rotation of the first transmission rod 6 causes the second transmission rod 9 to rotate through the arrangement of the first bevel gear 7 and the second bevel gear 8. Thus, the second transmission rod 9 can drive one of the first gear bodies 10 near the bottom to rotate, which in turn drives the three second gear bodies 11 near the bottom to rotate and revolve. Since the three second gear bodies 11 in the same layer are connected together through the first gear bodies 10 to form a whole, when the three second gear bodies 11 at the bottom rotate, one of the connecting frames 13 at the bottom rotates with it. The rotation speed of the connecting frame 13 at the bottom is equivalent to the angular velocity of the second gear bodies 11. The rotation of the connecting frame 13 at the bottom can drive the connecting frame 13 at the middle position to rotate through the transmission column 14 at the bottom, thereby causing one of the gear assemblies at the middle position to rotate. Similarly, the rotation of one of the gear assemblies at the middle position can be caused by the rotation of another gear assembly at the top position, thereby driving the connecting column 16 to rotate.

[0064] Then: the rotation of the connecting column 16 can cause the mast lifting mechanism 3 to rotate through the second rotating ring 29, thereby turning the mast lifting mechanism 3. During the process, due to the setting of three sets of gear assemblies, the rotation speed of the circular plate 22 is reduced in multiple stages to further reduce the rotation speed of the connecting column 16, thereby enabling the mast lifting mechanism 3 to rotate slowly.

[0065] During the process: When the mast lifting mechanism 3 turns, the second bevel gear 8 can rotate on the top of the scale plate 27. Therefore, the rotation angle of the mast lifting mechanism 3 can be directly observed through the setting of the measuring plate 28 and the scale plate 27.

[0066] Finally: When the mast lifting mechanism 3 turns to the designated position, the hydraulic cylinder 17 can be activated. At this time, the arc plate 18 moves toward the first rectangular bar 20. During the process, the elastic plate 19 contacts the first rectangular bar 20 and deforms. Part of its area is concave and convex. The convex area fills the gap between each pair of first rectangular bars 20, while the first rectangular bar 20 is located in its concave area, thereby making the elastic plate 19 and the first rectangular bar 20 tightly connected, reducing the rotation of the first transmission rod 6, and thus positioning the mast lifting mechanism 3 after rotation, reducing the possibility of it rotating on its own.

[0067] In summary, this invention effectively slows down the turning speed of the mast lifting mechanism 3 through its adjustable mechanism, thereby achieving more precise positioning and position adjustment. This is crucial for tasks requiring high-precision positioning, such as measurement, imaging, and positioning work. Furthermore, it reduces the impact of inertial forces and motion instability, meeting the requirements for high precision and high controllability.

[0068] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A precision positioning mechanism for a vehicle-mounted wheeled lifting mast, comprising a wheeled chassis assembly (1) and a mast lifting mechanism (3) mounted at the top center of the wheeled chassis assembly (1) via an adjustment mechanism, wherein the mast lifting mechanism (3) is rotatably connected to the wheeled chassis assembly (1), a mast assembly (4) is mounted on the mast lifting mechanism (3), and an operating platform is mounted on the mast assembly (4), characterized in that: The adjustment mechanism includes a rotation component for rotating the mast lifting mechanism (3) and a drive component for driving the rotation component. The drive component includes a support plate (5), and the support plate (5) is fixed to one end of the top of the wheel chassis assembly (1). The support plate (5) is rotatably connected to a first transmission rod (6), and the first transmission rod (6) passes through the interior of the base (2) and is rotatably connected to the base (2). The end of the first transmission rod (6) away from the support plate (5) is fixed with a first bevel gear (7), and the first bevel gear (7) is located inside the base (2). The bottom of the outer side of the first bevel gear (7) is meshed with a second bevel gear (8), and the interior of the second bevel gear (8) is fixed with a second transmission rod (9), and the second transmission rod (9) is rotatably connected to the wheel chassis assembly (1). The outer side of the first transmission rod (6) near the support plate (5) is fixed with a second rectangular bar (21), and the outer side of the second rectangular bar (21) is movably connected with a circular plate (22). The drive assembly also includes a positioning assembly. Multiple first rectangular bars (20) are fixed on the outer side of the first transmission rod (6) and near the outer side of the base (2). A hydraulic cylinder (17) is installed on the outer side of the base (2). An arc plate (18) is fixed at the output end of the hydraulic cylinder (17). An elastic plate (19) is installed on the side of the arc plate (18) near the first rectangular bars (20). A partition (31) is installed inside the base (2) and near the top, and the partition (31) divides the interior of the base (2) into a limiting groove and an installation groove; The limiting groove is located above the partition (31), the mounting groove is located below the partition (31), and the indexing component is located inside the mounting groove; The indexing assembly includes three gear assemblies, and the three gear assemblies are all located inside the mounting slot on the base (2). The three gear assemblies are arranged vertically, and each gear assembly includes a toothed ring (30), and the toothed ring (30) is rotatably connected to the base (2). The gear ring (30) is internally connected to three second gear bodies (11), and a first gear body (10) is connected to the center of the three second gear bodies (11). One of the first gear bodies (10) at the lowest position is fixedly connected to the second transmission rod (9). A connecting frame (13) is provided on the top of each of the three second gear bodies (11). Three connecting rods (12) are rotatably connected to the bottom of the connecting frame (13), and the three connecting rods (12) are rotatably connected to the three second gear bodies (11) respectively. A transmission column (14) is fixed to the top of each of the two connecting frames (13) below, and the two transmission columns (14) are respectively fixedly connected to the two first gear bodies (10) above them; A connecting post (16) is fixed to the top of one of the upper connecting frames (13), and the connecting post (16) It is vertically upward and passes through the partition (31) to connect with the second rotating ring (29), and the connecting column (16) is rotatably connected to the partition (31).

2. The precision indexing mechanism for a vehicle-mounted wheeled lifting mast according to claim 1, characterized in that: The toothed ring (30) is fixed with a first rotating ring (15) on its outer side, and the base (2) has a rotating groove adapted to the first rotating ring (15) inside, and the first rotating ring (15) is located inside the rotating groove on the base (2).

3. The precision indexing mechanism for a vehicle-mounted wheeled lifting mast according to claim 2, characterized in that: The circular plate (22) has a circular sliding hole adapted to the first transmission rod (6) inside. The first transmission rod (6) is located inside the circular sliding hole on the circular plate (22). The circular plate (22) also has a rectangular groove (23) adapted to the second rectangular strip (21) inside.

4. The precision indexing mechanism for a vehicle-mounted wheeled lifting mast according to claim 3, characterized in that: The number of rectangular grooves (23) is three. A handle (24) is fixed on the outside of the circular plate (22). A bearing plate (25) is fixed on the top of the support plate (5). A plurality of elastic retaining rings (26) adapted to the handle (24) are installed on the side of the bearing plate (25) near the handle (24).

5. The precision indexing mechanism for a vehicle-mounted wheeled lifting mast according to claim 4, characterized in that: The bottom of the mast lifting mechanism (3) is fixed with a second rotating ring (29), which is located inside the limiting groove and is rotatably connected to the base (2).

6. A method for using a precision indexing mechanism for a vehicle-mounted wheeled lifting mast, characterized in that: The method, applied to the precision indexing mechanism of claim 5, includes the following steps: S1: Slide the circular plate (22) to the outside of the second rectangular bar (21), at which time the second rectangular bar (21) is located inside the rectangular groove (23); S2: Rotate the circular plate (22), and through the cooperation of the second rectangular bar (21) and the rectangular groove (23), drive the first transmission rod (6) to rotate; the first transmission rod (6) drives the first bevel gear (7) at its end to rotate, the first bevel gear (7) meshes with the second bevel gear (8) and drives the second transmission rod (9) to rotate, the second transmission rod (9) drives the indexing assembly to work, thereby causing the connecting column (16) to rotate; S3: The rotation of the connecting column (16) through the second rotating ring (29) causes the mast lifting mechanism (3) to turn slowly; S4: The rotation angle of the mast lifting mechanism (3) can be observed directly through the measuring plate (28) and the scale plate (27); S5: Start the hydraulic cylinder (17) to make the elastic plate (19) contact the first rectangular bar (20) to position the mast lifting mechanism (3).

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