A tool for adjusting the height of a lifting gear

Abstract

This invention belongs to the technical field of stage machinery equipment, specifically relating to a tool for adjusting the height of a lifting gear. It includes a frame and a rack positioned below it. The lower surface of the frame has four wheels arranged in a rectangular pattern on a horizontal plane. A fixed housing is spaced apart directly below the frame. Both the fixed housing and the rack are arranged along the length of the frame, and the rack is detachably connected to the lower surface of the fixed housing. The upper surface of the fixed housing has an adjusting rod and two support rods. The adjusting rod is vertically positioned at the vertical centerline of the fixed housing, with one end connected to the surface of the fixed housing and the other end vertically passing through the frame. An adjusting cylinder is rotatably connected to the upper surface of the frame, and the adjusting cylinder is coaxially sleeved on the outer surface of the adjusting rod. Using this invention, the installation height of the rack on the stage can be quickly adjusted according to the installation position of the gear on the drive unit, thereby improving the stability of the stage during movement.

Description

Technical Field

[0001] This invention belongs to the field of stage machinery and equipment technology, specifically relating to a tool for adjusting the height of lifting gears. Background Technology

[0002] In modern theaters, the stage carriage is a crucial component of stage machinery, undertaking multiple tasks such as transporting scenery and creating dynamic stage effects. Improving the operational precision of the stage carriage and achieving smoother operation is a key focus in the field of stage machinery today. Stage carriages operating via rack and pinion transmission utilize the rotation of gears on the drive unit to drive a rack on the carriage, enabling horizontal movement on the stage. The meshing of the gears and rack directly affects the carriage's operational performance and is a crucial aspect that requires careful control during stage construction. Therefore, there is an urgent need for a tool that is simple in structure, easy to operate, and can assist in adjusting the installation height of the drive unit gears to improve the gear-rack meshing degree, thus meeting the high-precision operation requirements of modern stage machinery. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a tool for adjusting the height of the lifting gear, which can quickly adjust the installation height of the rack on the carriage according to the installation position of the gear on the drive unit, thereby improving the stability of the carriage during movement.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A tool for adjusting the height of a lifting gear includes a frame and a rack disposed below it. The lower surface of the frame has four wheels arranged in a rectangular pattern in a horizontal plane. A fixed housing is spaced apart directly below the frame. Both the fixed housing and the rack are arranged along the length of the frame, and the rack is detachably connected to the lower surface of the fixed housing. The upper surface of the fixed housing has an adjusting rod and two support rods. The adjusting rod is vertically positioned at the vertical centerline of the fixed housing, with one end connected to the surface of the fixed housing and the other end vertically passing through the frame. An adjusting cylinder is rotatably connected to the upper surface of the frame. The adjusting cylinder is coaxially sleeved on the outer surface of the adjusting rod, and the inner ring of the adjusting cylinder is threadedly connected to the outer ring of the adjusting rod. The two support rods are symmetrically arranged about the adjusting rod, with one end of each support rod connected to the upper surface of the fixed housing and the other end vertically passing through the frame.

[0005] Furthermore, the surface of the frame is provided with a first through hole for the adjustment rod to pass through and two second through holes corresponding to the support rods respectively. Each second through hole is rectangular in the horizontal plane, and the axis of the length direction of each second through hole coincides with the axis of the length direction of the frame. Each second through hole is slidably connected to a movable frame that moves along its length direction. A first limiting member is provided between the frame and the movable frame to restrict the relative movement between the two. One end of each support rod and adjustment rod is hinged to the fixed housing and rotates in the vertical plane. The other end of each support rod is vertically inserted into the corresponding movable frame. A second limiting member is provided between the movable frame and the support rod to restrict the relative movement between the two. A horizontal bubble meter is provided on the outer surface of the fixed housing, and the horizontal bubble meter is located at the axis of the fixed housing.

[0006] Furthermore, each of the wheels is rotatably connected to a movable bracket, and a fixed bracket is vertically slidably connected to the outer surface of each movable bracket. Each fixed bracket is fixedly connected to the surface of the vehicle frame. Multiple vertically spaced limiting grooves are opened on the outer surface of each movable bracket. A limiting block that moves in the horizontal direction is elastically slidably connected to the surface of the fixed bracket. One end of the limiting block passes through the fixed bracket and cooperates with the limiting groove, while the other end is located outside the fixed bracket.

[0007] Furthermore, the first limiting member includes a first rack arranged along the length direction of the second through hole and a first limiting tooth horizontally elastically arranged on the movable frame. The first rack is fixedly arranged on the inner surface of the second through hole. The first limiting tooth is vertically arranged and cooperates with the first rack. Both ends of the first limiting tooth pass through the movable frame and are connected to a first locking block. The second limiting member includes a second rack arranged along the length direction of the support rod and a second limiting tooth horizontally elastically arranged on the movable frame. The second rack is fixed on the outer surface of the support rod. The second limiting tooth is horizontally arranged and cooperates with the second rack. The surface of the second limiting tooth is connected to a second locking block. Both ends of the second locking block pass through the movable frame. The upper and lower surfaces of each movable frame are rotatably connected to a movable ring coaxial with the support rod. The upper and lower movable rings move synchronously. The outer surface of the movable ring simultaneously abuts against the outer surfaces of the first locking block and the second locking block. The surface of the movable ring is also provided with a notch corresponding to the first locking block and the second locking block.

[0008] Furthermore, the tooth spacing of the second rack corresponds one-to-one with the rotation angle of the fixed housing.

[0009] Furthermore, each of the movable skeletons has vertically moving balls elastically connected to its upper surface, and the surface of the movable ring has two positioning grooves that cooperate with the balls, and the two positioning grooves are spaced apart.

[0010] Furthermore, each of the movable rings has a vertically arranged paddle attached to its surface.

[0011] The beneficial effects of this invention are as follows: 1. This invention, through multi-dimensional structural innovation, constructs a dual adjustment system of "height + angle" and a visual detection mechanism, significantly optimizing the accuracy and efficiency of stage carriage gear installation. For height adjustment, a complementary mode of "coarse wheel adjustment + fine adjustment cylinder" is adopted. Regarding angle adjustment, the angle of the rack in the vertical plane can be flexibly adjusted by using the hinge point between the adjusting rod and the fixed housing as the center, combined with the sliding of the movable frame within the rectangular through-hole. The real-time calibration function of the level bubble meter effectively eliminates the tilting problem caused by uneven stage surfaces, ensuring the rack is always horizontal and providing a reliable benchmark for meshing detection. The detachable design of the rack and its fully open installation position not only broadens the tool's adaptability to different carriages and gears but also enables visual observation of the meshing state. Workers do not need to reach into enclosed gaps, completely avoiding the risk of pinching injuries, and significantly improving operational convenience and safety. 2. Through integrated structural design and meticulous detailing, the tool further reduces the difficulty of use and enhances adjustment stability and traceability. Regarding the locking and unlocking mechanism, the linkage design of the movable ring integrates the dual limiting operations of the frame-movable skeleton and the movable skeleton-support rod into a single rotation, coupled with the convenient force-applying structure of the paddle. The cooperation between the ball bearing and the positioning groove provides clear gear feedback, ensuring the movable ring accurately switches to the "locked" or "unlocked" state. The quantitative control of angle adjustment breaks through traditional limitations; the one-to-one correspondence between the second rack tooth spacing and the rotation angle of the fixed housing indirectly ensures the stability of the stage carriage operation and the continuity of the performance effect.

[0012] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0013] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the meshing of the rack and the drive unit gear of the present invention; Figure 2 This is a front view of the overall structure of the present invention; Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 This is a side view of the overall structure of the present invention; Figure 5This is a schematic diagram showing the connection between the movable frame and the vehicle frame of the present invention; Figure 6 This is a schematic diagram of the active skeleton structure of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the active skeleton structure of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the rotating structure of the movable ring of the present invention.

[0014] The following labels are shown in the attached diagram: 1. Frame, 2. Rack, 3. Wheel, 4. Fixed housing, 5. Support rod, 6. Adjusting rod, 7. Movable frame, 8. Horizontal bubble meter, 9. Movable bracket, 10. Fixed bracket, 11. Limiting groove, 12. Limiting block, 13. First rack, 14. First limiting tooth, 15. First locking block, 16. Second rack, 17. Second limiting tooth, 18. Second locking block, 19. Movable ring, 20. Notch, 21. Paddle, 22. Adjusting cylinder. Detailed Implementation

[0015] like Figures 1-8 As shown, A tool for adjusting the height of a lifting gear includes a frame 1 and a rack 2 disposed below it. The frame 1 is I-shaped in the horizontal plane. Four wheels 3 arranged in a rectangular pattern in the horizontal plane are provided on the lower surface of the frame 1. Fixed housings 4 are spaced apart directly below the frame 1. The fixed housings 4 and the rack 2 are both arranged along the length of the frame 1, and the rack 2 is detachably connected to the lower surface of the fixed housings 4 by bolts. The frame 1, fixed housings 4, and rack 2 are all horizontally arranged. An adjusting rod 6 and two support rods 5 are provided on the upper surface of the fixed housing 4. The rod 6 is vertically positioned at the vertical geometric center of the fixed housing 4, with its lower end connected to the surface of the fixed housing 4 and its upper end vertically passing through the geometric center of the frame 1. An adjusting cylinder 22 is rotatably connected to the upper surface of the frame 1, and the adjusting cylinder 22 is also vertically positioned on the vertical center line of the frame 1. The adjusting cylinder 22 is coaxially sleeved on the outer surface of the adjusting rod 6, and the inner ring of the adjusting cylinder 22 is threadedly connected to the outer ring surface of the adjusting rod 6. Two support rods 5 are symmetrically arranged about the adjusting rod 6, and the lower ends of each support rod 5 are connected to the upper surface of the fixed housing 4, while the upper ends slide vertically through the frame 1.

[0016] As shown in the diagram, when adjusting the gear height during the installation of the stage trolley drive, rotating the adjusting cylinder 22 causes the adjusting rod 6 to move vertically via a thread. Simultaneously, the vertical movement of the adjusting rod 6 drives the fixed housing 4 and rack 2 to move up and down. The two support rods 5 on the upper surface of the fixed housing 4 also move synchronously, effectively ensuring the stability of the fixed housing 4 during its vertical movement. Rotating the adjusting cylinder 22 indirectly adjusts the height of the rack 2, simulating the height of the rack 2 mounted on the stage trolley surface. The trolley frame 1 is then placed on the stage surface and moved to simulate the trolley's trajectory. During this movement, the meshing of the rack 2 with the gears on the drive unit is observed. Since the rack 2 is mounted on the lower surface of the fixed housing 4 without any obstruction, it is fully exposed to the operator's view, allowing for effective observation of the meshing between the rack 2 and the drive unit gears. This helps determine if the gears enter the tooth groove vertically, if the meshing depth reaches the design value, and if there are any issues such as tooth misalignment, skipped teeth, or uneven meshing. If any deviation is found, the adjusting cylinder 22 can be rotated again to indirectly adjust the height of the rack 2, making the operation convenient and quick. Of course, the rack 2 and the fixed housing 4 are detachably connected by bolts, and different sizes of rack 2 can be replaced according to the size of the stage vehicle and the size of the drive unit gear, which improves the applicability of the invention.

[0017] The threaded drive enables precise adjustment of the rack 2 height, which, combined with the stable guidance of the support rod 5, ensures that parameters such as the meshing depth and center distance between the rack 2 and the drive gear meet design requirements. This solves the problem that traditional "hand-feel confirmation" cannot accurately control the meshing state. At the same time, the rack 2 is fully exposed, eliminating the need for staff to put their hands into the enclosed gaps of the stage wagon, thus completely avoiding safety risks such as pinching and scratching. Visual inspection makes meshing deviations clear at a glance, and the height of the rack 2 can be adjusted immediately via the adjusting cylinder 22, reducing the number of repeated adjustments. The detachable rack 2 connection method allows it to be adapted to stage wagons and drive gears of different sizes, eliminating the need for custom-made tools for specific scenarios and reducing construction costs. The precise meshing state prevents abnormal wear between the gear and rack 2 due to issues such as tooth misalignment and skipping, improving the operational stability of the stage wagon drive system, extending the overall service life of the equipment, and ensuring the stage effect during performances.

[0018] In this embodiment, the surface of the frame 1 is provided with a first through hole for the adjustment rod 6 to pass through and two second through holes corresponding to the support rods 5 respectively. The adjustment hole is circular, and each of the second through holes is rectangular in the horizontal plane. The axis of the length direction of each second through hole coincides with the axis of the length direction of the frame 1. Each of the second through holes is horizontally slidably connected to a movable frame 7 that moves along its length direction. A first limiting member is provided between the frame 1 and the movable frame 7 to restrict the relative movement of the two. The lower ends of each support rod 5 and the adjustment rod 6 are hinged to the fixed housing 4 and rotate in the vertical plane. The upper ends of each support rod 5 are vertically inserted into the corresponding movable frame 7. A second limiting member is provided between the movable frame 7 and the support rod 5 to restrict the relative movement of the two. A horizontal bubble meter 8 is detachably connected to the outer surface of the fixed housing 4 by a buckle. The horizontal bubble meter 8 is located at the vertical axis of the fixed housing 4.

[0019] As shown in the figure, the bottom ends of both the support rod 5 and the adjusting rod 6 are hinged to the upper surface of the fixed housing 4 and rotate in the vertical plane. The two support rods 5 are symmetrically arranged about the adjusting rod 6. Therefore, by rotating one end of the fixed housing 4, the fixed housing 4 can rotate around the hinge point of the adjusting rod 6 and the fixed housing 4 as the center of rotation, indirectly adjusting the angle of the rack 2 in the vertical plane. Since the upper ends of the two support rods 5 are respectively inserted into the corresponding movable frames 7, and the movable frames 7 are respectively slidably arranged in the second through holes, the two adjusting rods 5 rotate simultaneously with the fixed housing 4. Rods 6 slide vertically through the movable frames 7, simultaneously driving each movable frame 7 to move horizontally, thus ensuring the normal rotation of the fixed housing 4. Furthermore, the first limiting member restricts or releases the interaction between the movable frames 7 and the chassis 1, while the second limiting member restricts or releases the interaction between the movable frames 7 and the support rods 5. Using a level bubble meter 8 installed on the surface of the fixed housing 4, it can be confirmed that the fixed housing 4 has rotated to a horizontal position, indirectly ensuring that the rack 2 remains horizontal, effectively eliminating installation accuracy problems caused by uneven stage surfaces. After adjustment, the first and second limiting members can be used to fix the fixed housing 4 and the chassis 1, maintaining them in their current state to ensure the accuracy and stability of the rack 2 when meshing with the gears.

[0020] The newly added angle adjustment function and the calibration mechanism of the level bubble meter 8 can specifically solve the problem of rack 2 tilting caused by uneven stage floor. Real-time calibration ensures that rack 2 is always in a horizontal state, avoiding detection errors such as misjudgment of meshing depth and tooth deviation caused by rack 2 tilting. This makes the meshing simulation of gear and rack 2 more consistent with actual installation conditions, providing a more accurate reference for subsequent formal installation. The design of the first and second limit components can lock the structural state in two dimensions (horizontal displacement (movable frame 7 and chassis 1) and vertical position (support rod 5 and movable frame 7) after the angle and height are adjusted. This prevents rack 2 position displacement caused by tool shaking during the inspection process, ensuring the stability and accuracy of meshing state observation during full-stroke movement inspection. The visual calibration method of the level bubble meter 8 does not rely on professional measuring equipment. Staff can intuitively judge the horizontal state of rack 2, reducing the operation threshold and further improving construction efficiency.

[0021] In this embodiment, each wheel 3 is rotatably connected to a movable bracket 9, and a fixed bracket 10 is vertically slidably connected to the outer surface of each movable bracket 9. The movable bracket 9 and the fixed bracket 10 are both U-shaped in the vertical plane. The upper end of each fixed bracket 10 is fixedly connected to the surface of the frame 1 by bolts. Three vertically evenly spaced limiting grooves 11 are opened on the outer surface of each movable bracket 9. A limiting block 12 that moves in the horizontal direction is elastically slidably connected to the surface of the fixed bracket 10. One end of the limiting block 12 passes through the fixed bracket 10 and cooperates with the limiting groove 11, and the other end is located outside the fixed bracket 10.

[0022] As shown in the figure, by pulling one end of the limiting block 12, the other end of the limiting block 12 is no longer engaged with the limiting groove 11, allowing the movable bracket 9 to be adjusted vertically and indirectly adjusting the distance between the wheel 3 and the frame 1. This achieves the effect of quickly adjusting the height of the frame 1. When the limiting block 12 is released, it automatically engages with the corresponding limiting groove 11 under the action of elastic force, locking the current height. Each fixed bracket 10 has three limiting grooves 11 on its outer surface that engage with the limiting block 12, allowing workers to quickly adjust each wheel 3 to the same height. This indirectly achieves the purpose of quickly adjusting the height of the rack 2 to meet the compatibility requirements of drive gears of different sizes. Combined with the adjusting cylinder 22, the height of the rack 2 is indirectly adjusted via threads. One is for coarse adjustment and the other for fine adjustment, which not only improves the applicability of the invention but also improves the accuracy of subsequent meshing between the rack 2 and the drive unit gear.

[0023] The coarse adjustment mechanism of wheel 3 provides multiple height options through three limit slots 11, which can quickly adapt to drive gears of different sizes (such as different diameters and modules) without the need to adjust to the limit fine adjustment range for specific gears. Combined with the detachable design of rack 2, it further covers the installation needs of different stage carriages. Compared with the single adjustment method that relies solely on thread fine adjustment, the combination of "coarse adjustment + fine adjustment" greatly reduces the height adjustment time. In the coarse adjustment stage, the height of rack 2 can be quickly positioned to the target range (e.g., from the initial height to close to the design value in only 1-2 seconds). (Second limit slot 11 switching), the fine adjustment stage only requires fine adjustment of the adjusting cylinder 22 to complete the precise calibration, avoiding the inefficient operation of rotating the adjusting cylinder 22 for a long time, and significantly improving the overall construction efficiency. The coarse adjustment first "pre-positions" the height of the rack 2, so that the threaded transmission in the fine adjustment stage only needs a small range of adjustment to reach the design value, reducing the cumulative error that may be caused by the large range of adjustment of the threaded transmission; at the same time, after the coarse adjustment, the height of the frame 1 is closer to the actual installation conditions, and the key parameters such as the meshing depth and backlash of the rack 2 and the gear can be controlled more accurately during the fine adjustment, further improving the installation accuracy of the drive system.

[0024] In this embodiment, the first limiting member includes a first rack 13 arranged along the length direction of the second through hole and a first limiting tooth 14 horizontally elastically arranged on the movable frame 7. The first rack 13 is fixedly arranged on the inner surface of the second through hole, and the first limiting tooth 14 is vertically arranged and cooperates with the first rack 13. Both ends of the first limiting tooth 14 pass through the movable frame 7 and are connected to first locking blocks 15. Each first locking block 15 is slidably arranged on the upper and lower end faces of the movable frame 7. The second limiting member includes a second rack 16 arranged along the length direction of the support rod 5 and a second limiting tooth 17 horizontally elastically arranged on the movable frame 7. The second rack 16 is embedded in... The second limiting tooth 17 is fixed to the outer surface of the support rod 5. The second limiting tooth 17 is horizontally set and cooperates with the second rack 16. The surface of the second limiting tooth 17 is connected to the second locking block 18. The two ends of the second locking block 18 pass through the upper and lower end faces of the movable frame 7 and are slidably connected to them. The upper and lower surfaces of each movable frame 7 are rotatably connected to the movable ring 19 coaxial with the support rod 5. The two movable rings 19 move synchronously. The outer surface of the movable ring 19 simultaneously abuts against the outer surfaces of the first locking block 15 and the second locking block 18 and restricts their movement. The surface of the movable ring 19 is also provided with two notches 20 that correspond to the first locking block 15 and the second locking block 18.

[0025] As shown in the figure, when it is necessary to fix the position between the movable frame 7 and the frame 1, and between the movable frame 7 and the support rod 5, the movable ring 19 is rotated so that the outer surface of the movable ring 19 abuts against the first locking block 15, and the inner surface of the movable ring 19 abuts against the second locking block 18, thereby fixing the first locking block 15 in the current position. This indirectly causes the first limiting tooth 14 and the first rack 13 to engage with each other, and restricts the relative movement between the movable frame 7 and the frame 1. Similarly, after the second locking block 18 abuts against the movable ring 19, the second locking block 18 is fixed in the current position, thereby indirectly causing the second limiting tooth 17 and the second rack 16 to engage with each other, and restricting the relative movement between the movable frame 7 and the support rod 5. When the tilt angle of rack 2 needs to be adjusted, rotate the movable ring 19 until the two notches 20 on the surface of the movable ring 19 correspond to the first locking block 15 and the second locking block 18 respectively. At this time, when the fixed housing 4 is rotated, the surface of the first limiting tooth 14 abuts against the first rack 13 and compresses the spring (a spring is provided between the first limiting tooth 14 and the movable frame 7, which is not shown in the figure). The first limiting tooth 14 will indirectly drive the first locking block 15 to slide on the surface of the movable frame 7, and the notch 20 on the surface of the movable ring 19 can just allow the first locking block 15 to slide without restriction. When the first limiting tooth 14 engages with the first rack 13 again, the spring extends and releases elastic potential energy. Similarly, the working principle of the second limiting tooth 17 and the second rack 16 is similar to that of the first limiting tooth 14 and the first rack 13, and will not be described in detail here. By rotating the movable ring 19, the first locking block 15 and the second locking block 18 abut against the surface of the movable ring 19, or correspond to the notch 20 on the surface of the movable ring 19, thereby indirectly fixing or releasing the movable relationship between the movable frame 7 and the frame 1, and between the movable frame 7 and the support rod 5. The operation is simple and quick.

[0026] The linkage design of the movable ring 19 integrates the locking or unlocking operations of the frame 1 and the movable skeleton 7, and the movable skeleton 7 and the support rod 5 into a single rotation action, avoiding the cumbersome process of operators operating multiple limit components separately. Especially when the angle of the rack 2 needs to be adjusted frequently (such as calibrating the level or adapting to the ground slope), the adjustment time can be greatly shortened and the operation complexity reduced, so that even non-professionals can quickly get started.

[0027] In this embodiment, the tooth spacing of the second rack 16 corresponds one-to-one with the rotation angle of the fixed housing 4.

[0028] As shown in the figure, with the pre-set tooth spacing of the second rack 16, when the fixed housing 4 is rotated, the second limiting tooth 17 will engage with two different teeth on the second rack 16 every 0.1° rotation. The operator can obtain feedback through the stretching / contraction of the spring between the second locking block 18 and the movable frame 7, as well as the collision between the second limiting tooth 17 and the second rack 16. This achieves the purpose of precisely adjusting the angle of the fixed housing 4, transforming the traditional experience-based "fuzzy adjustment" into "quantitative and controllable adjustment". The operator does not need to observe the slight deviation of the level bubble meter 8 with the naked eye or rely on the feel to judge the angle change, but can directly perceive the angle change of the fixed housing 4 through the meshing feedback of the second limiting tooth 17 and the rack 2 (the tactile feeling of spring stretching / contraction, the feedback of meshing collision), and accurately control the adjustment accuracy.

[0029] In this embodiment, each of the movable skeletons 7 has a vertically moving ball attached to its upper surface. Part of the surface of the ball is located outside the movable skeleton 7. The surface of the movable ring 19 has two positioning grooves that cooperate with the ball, and the two positioning grooves are spaced apart (the ball and the positioning groove are obscured in the figure and are not shown).

[0030] Two positioning slots are spaced apart. When the surface of the movable ring 19 simultaneously abuts against the outer surfaces of the first locking block 15 and the second locking block 18, the ball engages with one of the positioning slots. Rotating the movable ring 19, when the two notches 20 on its surface simultaneously align with the first locking block 15 and the second locking block 18, the ball engages with the other positioning slot. The combination of these two spaced slots and the elastically movable ball provides the operator with two positions and feedback on rotating the movable ring 19, facilitating quick adjustment to the appropriate position.

[0031] In this embodiment, each of the movable rings 19 is connected to a vertically arranged lever 21 on its surface, which facilitates the rotation of the movable ring 19 by the operator.

[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A tool for adjusting the height of a lifting gear, comprising a frame (1) and a rack (2) disposed below it, characterized in that: The lower surface of the frame (1) is provided with four wheels (3) arranged in a rectangular shape on the horizontal plane. A fixed housing (4) is spaced apart directly below the frame (1). The fixed housing (4) and the rack (2) are both arranged along the length of the frame (1), and the rack (2) is detachably connected to the lower surface of the fixed housing (4). The upper surface of the fixed housing (4) is provided with an adjusting rod (6) and two support rods (5). The adjusting rod (6) is vertically positioned at the vertical centerline of the fixed housing (4), and the adjustment... One end of the rod (6) is connected to the surface of the fixed housing (4), and the other end is vertically inserted through the frame (1). An adjusting cylinder (22) is rotatably connected to the upper surface of the frame (1). The adjusting cylinder (22) is coaxially sleeved on the outer surface of the adjusting rod (6), and the inner ring of the adjusting cylinder (22) is threadedly connected to the outer ring surface of the adjusting rod (6). Two support rods (5) are symmetrically arranged about the adjusting rod (6), and one end of each support rod (5) is connected to the upper surface of the fixed housing (4), and the other end is vertically inserted through the frame (1).

2. The tool for adjusting the height of a lifting gear according to claim 1, characterized in that: The surface of the frame (1) is provided with a first through hole for the adjustment rod (6) to pass through and two second through holes corresponding to the support rod (5). Each second through hole is rectangular in the horizontal plane, and the axis of the length direction of each second through hole coincides with the axis of the length direction of the frame (1). Each second through hole is slidably connected with a movable frame (7) that moves along its length direction. A first limiting member is provided between the frame (1) and the movable frame (7) to restrict the relative movement of the two. One end of each support rod (5) and adjustment rod (6) is hinged to the fixed housing (4) and rotates in the vertical plane. The other end of each support rod (5) is vertically inserted into the corresponding movable frame (7). A second limiting member is provided between the movable frame (7) and the support rod (5) to restrict the relative movement of the two. A horizontal bubble meter (8) is provided on the outer surface of the fixed housing (4), and the horizontal bubble meter (8) is located at the axis of the fixed housing (4).

3. A tool for adjusting the height of a lifting gear according to claim 2, characterized in that: Each wheel (3) is rotatably connected to a movable bracket (9), and each movable bracket (9) is vertically slidably connected to a fixed bracket (10) on its outer surface. Each fixed bracket (10) is fixedly connected to the surface of the frame (1). Each movable bracket (9) has multiple vertically spaced limiting grooves (11) on its outer surface. The fixed bracket (10) is elastically slidably connected to a limiting block (12) that moves in the horizontal direction. One end of the limiting block (12) passes through the fixed bracket (10) and cooperates with the limiting groove (11), while the other end is located outside the fixed bracket (10).

4. A tool for adjusting the height of a lifting gear according to claim 3, characterized in that: The first limiting member includes a first rack (13) arranged along the length of the second through hole and a first limiting tooth (14) horizontally elastically arranged on the movable frame (7). The first rack (13) is fixedly arranged on the inner surface of the second through hole. The first limiting tooth (14) is vertically arranged and cooperates with the first rack (13). Both ends of the first limiting tooth (14) pass through the movable frame (7) and are connected to a first locking block (15). The second limiting member includes a second rack (16) arranged along the length of the support rod (5) and a second limiting tooth (17) horizontally elastically arranged on the movable frame (7). The second rack (16) is fixed to the support rod (5). On the outer surface, the second limiting tooth (17) is horizontally set and cooperates with the second rack (16), and the surface of the second limiting tooth (17) is connected to the second locking block (18). The two ends of the second locking block (18) pass through the movable frame (7) respectively. The upper and lower surfaces of each movable frame (7) are rotatably connected to the movable ring (19) coaxial with the support rod (5), and the upper and lower movable rings (19) move synchronously. The outer ring surface of the movable ring (19) simultaneously abuts against the outer surfaces of the first locking block (15) and the second locking block (18), and the surface of the movable ring (19) is also provided with a notch (20) corresponding to the first locking block (15) and the second locking block (18).

5. A tool for adjusting the height of a lifting gear according to claim 4, characterized in that: The tooth spacing of the second rack (16) corresponds one-to-one with the rotation angle of the fixed housing (4).

6. A tool for adjusting the height of a lifting gear according to claim 5, characterized in that: Each of the movable skeletons (7) has a vertically moving ball on its upper surface. The surface of the movable ring (19) has two positioning grooves that cooperate with the ball, and the two positioning grooves are spaced apart.

7. A tool for adjusting the height of a lifting gear according to claim 6, characterized in that: Each of the aforementioned movable rings (19) has a vertically arranged paddle (21) connected to its surface.

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