Work calibration device for a working machine

Abstract

The application discloses an engineering machine operation calibration device, which comprises a moving seat, a mounting groove is formed in the top of the moving seat, spring dampers are mounted in the four corners of the inside of the mounting groove, the end portions of the four spring dampers are connected with support seats, the support seats are slidingly connected in the moving seat, pneumatic guide rails are symmetrically arranged in the support seats, sliding blocks are slidingly arranged on the outside of the pneumatic guide rails, mounting seats are fixedly connected to the top of the two sliding blocks, and fixed boxes are fixedly connected to the top of the mounting seats. The engineering machine operation calibration device has the advantages that the spring dampers and the multi-degree-of-freedom precision adjusting mechanism are integrated, a highly integrated calibration platform is constructed, ground unevenness and vibration interference on a construction site can be effectively isolated, a stable measurement reference is provided for a laser interferometer, meanwhile, multi-dimensional adjustment is realized, a measuring instrument can be quickly and accurately aligned with different operation positions and postures of the engineering machine, and the positioning efficiency of the calibration operation is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of calibration technology for engineering machinery operations, specifically to a calibration device for engineering machinery operations. Background Technology

[0002] As key equipment in modern engineering construction, the operational accuracy of construction machinery directly affects construction quality and efficiency. During actual operation, due to factors such as mechanical vibration, load variations, long-term wear, and environmental factors, the positioning accuracy and movement trajectory of the working devices of construction machinery (such as excavating arms, hoisting arms, and paving devices) are prone to deviations. Failure to detect and calibrate these deviations in a timely and accurate manner will lead to substandard work results and may even cause safety hazards.

[0003] Currently, the calibration of construction machinery mainly relies on traditional manual measurement and experience-based judgment, or on rough adjustments using simple measuring tools (such as levels and measuring tapes). These methods are not only time-consuming and labor-intensive, but also highly susceptible to human factors, making it difficult to guarantee accuracy. This is especially true for large and complex mechanical systems, where both calibration efficiency and accuracy are insufficient.

[0004] Existing laser measuring equipment is usually used independently. When calibrating working devices in different locations or postures, it is necessary to frequently adjust the spatial position and angle of the measuring instrument. Existing support structures are mostly rigid or manually adjustable, with limited adjustment range, cumbersome operation, and difficulty in quickly aligning the measurement points. The laser interferometer in existing engineering machinery operation calibration devices is usually fixedly installed in the device. When not in use or for maintenance, it is necessary to remove multiple screws to remove it, which is time-consuming and laborious. Moreover, the laser interferometer in existing devices lacks protection when in use, and is easily hit by falling dirt and gravel, affecting its use. Therefore, we propose an engineering machinery operation calibration device. Summary of the Invention

[0005] The purpose of this invention is to provide a calibration device for engineering machinery operation to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an engineering machinery operation calibration device, comprising a movable base, wherein the top of the movable base is provided with an installation groove, and spring dampers are installed at the four corners of the installation groove, the ends of the four spring dampers are connected to a support base, the support base is slidably connected to the movable base, pneumatic guide rails are symmetrically arranged inside the support base, and sliders are slidably arranged on the outer side of the pneumatic guide rails, and the tops of the two sliders are fixedly connected to an installation base; A fixed box is fixedly connected to the top of the mounting base, and an adjustable lifting seat is provided on the top of the fixed box. A support cylinder is fixedly connected to the top of the lifting seat, and an angle-adjustable support plate is provided on the top of the support cylinder. A linear module is provided inside the support plate, and a fixed seat is fixedly connected to the top of the sliding platform of the linear module. A laser interferometer is detachably installed on the top of the fixed seat, and a protective plate for protecting the laser interferometer is provided on the top of the fixed seat.

[0007] Preferably, the fixed box has vertically oriented lifting cavities symmetrically opened at both ends, and each lifting cavity is provided with a lifting screw and a limiting rod. The two ends of the lifting screw are rotatably connected to the lifting cavity at one end of the fixed box through bearings, and the end of the limiting rod is fixedly connected to the lifting cavity at the other end of the fixed box. The ends of the two L-shaped plates slide through the fixed box and are fixedly connected to the lifting seat. A servo motor is fixedly installed at the bottom of the mounting base, and the end of the output shaft of the servo motor passes through the mounting base and is fixedly connected to the lifting screw.

[0008] Preferably, the top of the lifting seat is rotatably connected to a transmission rod via a bearing, and a worm gear is fixedly connected to the outside of the transmission rod. The top of the lifting seat is symmetrically fixed with vertical plates, and a worm gear is rotatably connected between the two vertical plates via a bearing. The worm gear meshes with the worm wheel. A drive motor is fixedly installed on the outside of the vertical plate inside the support cylinder, and the end of the output shaft of the drive motor passes through the vertical plate and is fixedly connected to the worm gear. The top of the transmission rod is fixedly connected to the support plate 7.

[0009] Preferably, the top of the fixed base is symmetrically provided with adjustment grooves, and the top of the fixed base is symmetrically slidably provided with positioning plates. The bottom of the positioning plate is integrally provided with a sliding block, and the sliding block is slidably connected in the adjustment groove. The side wall of the sliding block at the bottom of the positioning plate is fixedly connected with a sliding rod, and the end of the sliding rod slides through the fixed base. The outer side of the sliding rod located outside the fixed base is threaded with a nut. A support spring is sleeved on the outer side of the sliding rod between the positioning plate and the inner wall of the adjustment groove, and the two ends of the support spring are fixedly connected to the sliding block and the inner wall of the fixed base, respectively. The laser interferometer is connected between the two positioning plates.

[0010] Preferably, the positioning plate is integrally provided with a fixing plate on one side of the laser interferometer, and the corresponding two side walls of the laser interferometer are provided with fixing grooves. The fixing plate is snapped into the fixing groove, and one end of the laser interferometer is in contact with the inner wall of the protective plate.

[0011] Preferably, a positioning block is fixedly connected to the top of the fixing seat, a positioning groove is opened at the bottom of the protective plate, the positioning block is snapped into the positioning groove, fastening bolts are symmetrically arranged on the surface of the protective plate outside the positioning groove, and fixing holes are symmetrically opened on the top of the fixing seat outside the positioning block, and the ends of the fastening bolts are threaded into the fixing holes.

[0012] Preferably, an electrical mounting cavity for installing electrical components is provided inside the fixed box between the two lifting cavities, and a cabinet door is hinged to the surface of the fixed box at the port of the electrical mounting cavity.

[0013] Preferably, gusseted cloth for dust prevention is provided between the inner wall of the support base and the side wall of the mounting base, and between the inner wall of the support plate and the side wall of the fixing base.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention constructs a highly integrated calibration platform by integrating a spring damper and a multi-degree-of-freedom precision adjustment mechanism. This platform can effectively isolate uneven ground and vibration interference at the construction site, providing a stable measurement benchmark for the laser interferometer. At the same time, its multi-dimensional adjustment enables the measuring instrument to quickly and accurately align with different working parts and postures of the engineering machine, greatly improving the positioning efficiency of the calibration operation.

[0015] This invention, through the inclusion of a quick-clamping mechanism and a detachable protective plate, ensures the stable and reliable installation of the laser interferometer, avoiding potential damage or errors from rigid clamping. It also effectively protects precision optical components from dust and water splashes, significantly enhancing the calibration equipment's environmental adaptability under harsh conditions. Furthermore, the modular design of the electrical mounting cavity facilitates centralized management and maintenance, while dustproof measures such as gusseted cloth extend the service life of core moving parts and reduce maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the support base and the movable base of the present invention; Figure 3 This is a cross-sectional view of the fixed box of the present invention. Figure 4 This is a cross-sectional view of the support cylinder of the present invention. Figure 5 This is a schematic diagram of the connection structure of the positioning plate of the present invention; Figure 6 This is a schematic diagram of the laser interferometer structure of the present invention.

[0017] In the diagram: 1. Movable seat; 2. Support seat; 3. Bellows cloth; 4. Fixed box; 5. Lifting seat; 6. Support cylinder; 7. Support plate; 8. Fixed seat; 9. Laser interferometer; 10. Protective plate; 11. Mounting slot; 12. Spring damper; 13. Pneumatic guide rail; 14. Slider; 15. Mounting seat; 16. Electrical mounting cavity; 17. Cabinet door; 18. Lifting cavity; 19. Lifting screw; 20. L-shaped plate; 21. Limiting rod; 22. Transmission rod; 23. Worm gear; 24. Drive motor; 25. Worm; 26. Linear module; 27. Positioning block; 28. Fastening bolt; 29. ​​Adjustment slot; 30. Positioning plate; 31. Slide rod; 32. Support spring; 33. Fixed plate; 34. Fixed slot; 35. Servo motor. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 , 2 4. The present invention provides a technical solution: an engineering machinery operation calibration device, including a movable seat 1, the top of the movable seat 1 is provided with an installation groove 11, and spring dampers 12 are installed at the four corners of the installation groove 11. The ends of the four spring dampers 12 are connected to a support seat 2. The support seat 2 is slidably connected in the movable seat 1. Pneumatic guide rails 13 are symmetrically arranged in the support seat 2, and sliders 14 are slidably arranged on the outside of the pneumatic guide rails 13. The tops of the two sliders 14 are fixedly connected to the mounting seats 15. The top of the mounting base 15 is fixedly connected to the fixed box 4, and the top of the fixed box 4 is provided with an adjustable lifting seat 5. The top of the lifting seat 5 is fixedly connected to the support cylinder 6, and the top of the support cylinder 6 is provided with an angle-adjustable support plate 7. The support plate 7 is provided with a linear module 26, and the top of the sliding platform of the linear module 26 is fixedly connected to the fixed seat 8. The top of the fixed seat 8 is detachably mounted with a laser interferometer 9, and the top of the fixed seat 8 is provided with a protective plate 10 for protecting the laser interferometer 9.

[0020] It should be noted that, in this embodiment, vertical lifting cavities 18 are symmetrically opened at both ends inside the fixed box 4. A lifting screw 19 is rotatably connected to one lifting cavity 18 via a bearing, and a limit rod 21 is fixedly installed in the other lifting cavity 18. Two L-shaped plates 20 are respectively connected to the lifting screw 19 and the limit rod 21. The other end of the L-shaped plate 20 slides through the fixed box 4 and is fixedly connected to the upper lifting seat 5. A vertically arranged transmission rod 22 is rotatably connected to the top of the lifting seat 5 via a bearing. A worm gear 23 is fixedly connected to the outside of the transmission rod 22. The unit is also symmetrically fixed with upright plates. The upright plates and transmission rod 22 are both located inside the support cylinder 6. A worm gear 25 is rotatably connected between the two upright plates through a bearing. The worm gear 25 is meshed with the worm wheel 23. When the drive motor 24 drives the worm gear 25 to rotate, the transmission rod 22 can be rotated through the meshing connection between the worm gear 25 and the worm wheel 23. The top of the transmission rod 22 is fixed to the support plate 7. The rotation of the transmission rod 22 can drive the support plate 7 to rotate, thereby adjusting the angle position of the laser interferometer 9. The self-locking characteristics of the worm wheel 23 and the worm gear 25 can ensure that the position is locked after the angle is adjusted.

[0021] Please see Figure 3 The fixed box 4 has vertical lifting cavities 18 symmetrically opened at both ends inside. Each of the two lifting cavities 18 is equipped with a lifting screw 19 and a limiting rod 21. The two ends of the lifting screw 19 are rotatably connected to the lifting cavity 18 at one end of the fixed box 4 through bearings. The end of the limiting rod 21 is fixedly connected to the lifting cavity 18 at the other end of the fixed box 4. The ends of the two L-shaped plates 20 slide through the fixed box 4 and are fixedly connected to the lifting seat 5. The bottom of the mounting seat 15 is fixedly mounted with a servo motor 35, and the end of the output shaft of the servo motor 35 passes through the mounting seat 15 and is fixedly connected to the lifting screw 19.

[0022] It should be noted that, in this embodiment, when the device is used, the protective plate 10 is first installed on the fixed base 8. During installation, the positioning groove on the protective plate 10 is correspondingly engaged with the outer side of the positioning block 27, and then the fastening bolt 28 is tightened to fix the protective plate 10 on the fixed base 8. The laser interferometer 9 is then installed on the fixed base 8. During installation, the positioning plates 30 on both sides are pulled apart, and then the tail end of the laser interferometer 9 is brought into contact with the inner wall of the protective plate 10. Then the two positioning plates 30 are loosened, and under the action of the support spring 32, the fixing plate 33 on the positioning plate 30 is correspondingly engaged with the fixing groove 34 on the side wall of the laser interferometer 9, so that the laser interferometer 9 is securely installed on the fixed base 8. The device is moved to the work site of the engineering machinery. The pneumatic guide rail 13 drives the slider 14 to move, which can drive the fixed box 4 to move horizontally within the support seat 2. This enables the measuring instrument to be coarsely adjusted in the horizontal plane or to track the moving target. The control system set in the device controls the servo motor 35 to work, which can drive the lifting screw 19 to rotate. Through the threaded connection between the L-shaped plate 20 and the lifting screw 19, the two L-shaped plates 20 are raised, which drives the lifting seat 5 to rise. This allows the height position of the laser interferometer 9 to be adjusted to meet the calibration requirements of different height work devices. The worm 25 can be driven to rotate by the drive motor 24. The transmission rod 22 can be rotated by the meshing connection between the worm 25 and the worm wheel 23, which can realize the rotation of the adjustment support plate 7, thereby realizing the adjustment of the angle of the laser interferometer 9. The self-locking characteristic of the worm wheel 23 slidingly connecting the worm 25 allows the support plate 7 and the measuring device on it to be locked at the required angle position after adjustment, so as to achieve precise alignment of the measuring beam. The linear module 26 integrated in the support plate 7 can drive the fixed seat 8 and the laser interferometer 9 on its sliding platform to perform precise linear motion along the length of the support plate 7, for precise alignment with specific measurement points; the protective plate 10 forms a protective cover covering the laser interferometer 9, which can prevent debris or water droplets falling from the construction site from directly contacting the optical components of the instrument.

[0023] Please see Figure 4 The top of the lifting seat 5 is rotatably connected to a transmission rod 22 via a bearing, and a worm gear 23 is fixedly connected to the outside of the transmission rod 22. Vertical plates are symmetrically fixed to the top of the lifting seat 5, and a worm 25 is rotatably connected between the two vertical plates via a bearing. The worm 25 meshes with the worm gear 23. A drive motor 24 is fixedly installed on the outside of the vertical plate inside the support cylinder 6, and the end of the output shaft of the drive motor 24 passes through the vertical plate and is fixedly connected to the worm 25. The top of the transmission rod 22 is fixedly connected to the support plate 7.

[0024] It should be noted that, in this embodiment, the control system set by the device can control the operation of the drive motor 24, which drives the worm 25 to rotate. The rotation of the transmission rod 22 is achieved through the meshing connection between the worm 25 and the worm wheel 23, which in turn drives the rotation of the support plate 7. The rotation of the support plate 7 can drive the rotation of the laser interferometer 9, thereby allowing the laser interferometer 9 to be adjusted for the calibration of the engineering machinery operation without moving the device.

[0025] Please see Figure 5 , 6The top of the fixed base 8 is symmetrically provided with adjustment grooves 29. The top of the fixed base 8 is symmetrically provided with positioning plates 30. The bottom of the positioning plate 30 is integrally provided with a sliding block, and the sliding block is slidably connected in the adjustment groove 29. The side wall of the sliding block at the bottom of the positioning plate 30 is fixedly connected with a sliding rod 31, and the end of the sliding rod 31 slides through the fixed base 8. The outer side of the sliding rod 31 located outside the fixed base 8 is threaded with a nut. The outer side of the sliding rod 31 is sleeved between the positioning plate 30 and the inner wall of the adjustment groove 29. The two ends of the support spring 32 are fixedly connected to the sliding block and the inner wall of the fixed base 8, respectively. The laser interferometer 9 is connected between the two positioning plates 30.

[0026] It should be noted that in this embodiment, the laser interferometer 9 can be detachably mounted on the fixed base 8. During installation, the two positioning plates 30 are pulled open, and then the tail end of the laser interferometer 9 is brought into contact with the inner wall of the protective plate 10. Then, the two positioning plates 30 are released, and under the action of the support spring 32, the fixing plate 33 on the positioning plate 30 is locked into the fixing groove 34 on the side wall of the laser interferometer 9, so that the laser interferometer 9 is securely mounted on the fixed base 8. When the laser interferometer 9 needs to be disassembled, only the two positioning plates 30 need to be pulled open, and then it can be pulled out directly in the direction away from the protective plate 10. The installation and disassembly are very convenient and quick, saving installation and disassembly time.

[0027] Please see Figure 5 , 6 The positioning plate 30 is integrally provided with a fixing plate 33 on one side of the laser interferometer 9. The corresponding two side walls of the laser interferometer 9 are provided with fixing grooves 34. The fixing plate 33 is snapped into the fixing groove 34. One end of the laser interferometer 9 is in contact with the inner wall of the protective plate 10.

[0028] It should be noted that in this embodiment, the two positioning plates 30 can clamp and position the two sides of the laser interferometer 9. After the two positioning plates 30 are tightly positioned, the fixing plates 33 on the positioning plates 30 are correspondingly engaged in the fixing grooves 34 on the laser interferometer 9, thereby achieving stable positioning of it.

[0029] Please see Figure 2 A positioning block 27 is fixedly connected to the top of the fixed base 8. A positioning groove is opened at the bottom end of the protective plate 10. The positioning block 27 is snapped into the positioning groove. Fastening bolts 28 are symmetrically arranged on the surface of the protective plate 10 outside the positioning groove. Fixing holes are symmetrically opened on the top of the fixed base 8 outside the positioning block 27. The ends of the fastening bolts 28 are threaded into the fixing holes.

[0030] It should be noted that when installing the protective plate 10 in this embodiment, the protective plate 10 is first installed on the fixed base 8. During installation, the positioning groove on the protective plate 10 is aligned with the outside of the positioning block 27, and then the fastening bolt 28 is tightened to fix the protective plate 10 on the fixed base 8. A detachable transparent protective cover can also be provided at the bottom of the protective plate 10 to protect the measuring instrument inside the protective cover. The protective cover can be a transparent film, which is fixed to the protective plate 10 by adhesive to prevent dust from entering the measuring instrument.

[0031] Please see Figure 3 An electrical mounting cavity 16 for installing electrical components is provided inside the fixed box 4 between the two lifting cavities 18, and a cabinet door 17 is hinged to the surface of the fixed box 4 at the port of the electrical mounting cavity 16.

[0032] It should be noted that in this embodiment, an electrical installation cavity 16 is provided between the two lifting cavities 18 inside the fixed box 4 for centralized installation of electrical components such as servo drives, controllers, and pneumatic control valves. A cabinet door 17 is hinged to the surface of the fixed box 4 at the port of the electrical installation cavity 16, which facilitates inspection and maintenance when internal components malfunction.

[0033] Please see Figure 1 A gusseted cloth 3 for dust prevention is provided between the inner wall of the support base 2 and the side wall of the mounting base 15, and between the inner wall of the support plate 7 and the side wall of the fixing base 8.

[0034] It should be noted that, in this embodiment, the accordion cloth 3 is provided to prevent dust and debris from entering the support base 2 and support plate 7 during engineering machinery operation, thereby extending the service life of the core moving parts and reducing maintenance costs.

[0035] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A calibration device for engineering machinery operation, characterized in that, The device includes a movable base (1), the top of which is provided with a mounting groove (11), and spring dampers (12) are installed at the four corners of the mounting groove (11). The ends of the four spring dampers (12) are connected to the support base (2). The support base (2) is slidably connected to the movable base (1). Pneumatic guide rails (13) are symmetrically arranged inside the support base (2), and sliders (14) are slidably arranged on the outside of the pneumatic guide rails (13). The tops of the two sliders (14) are fixedly connected to the mounting bases (15). The top of the mounting base (15) is fixedly connected to a fixed box (4), and the top of the fixed box (4) is provided with a lifting seat (5) that can be raised and lowered. The top of the lifting seat (5) is fixedly connected to a support cylinder (6), and the top of the support cylinder (6) is provided with an angle-adjustable support plate (7). A linear module (26) is provided inside the support plate (7), and the top of the sliding platform of the linear module (26) is fixedly connected to a fixed seat (8). A laser interferometer (9) is detachably installed on the top of the fixed seat (8), and a protective plate (10) is provided on the top of the fixed seat (8) for protecting the laser interferometer (9).

2. The engineering machinery operation calibration device according to claim 1, characterized in that: The fixed box (4) has vertical lifting cavities (18) symmetrically opened at both ends inside. The two lifting cavities (18) are respectively equipped with lifting screws (19) and limiting rods (21). The two ends of the lifting screws (19) are rotatably connected to the lifting cavity (18) at one end of the fixed box (4) through bearings. The end of the limiting rod (21) is fixedly connected to the lifting cavity (18) at the other end of the fixed box (4). The ends of the two L-shaped plates (20) slide through the fixed box (4) and are fixedly connected to the lifting seat (5). The bottom of the mounting seat (15) is fixedly installed with a servo motor (35), and the output shaft end of the servo motor (35) passes through the mounting seat (15) and is fixedly connected to the lifting screws (19).

3. The engineering machinery operation calibration device according to claim 1, characterized in that: The top of the lifting seat (5) is rotatably connected to a transmission rod (22) via a bearing, and a worm gear (23) is fixedly connected to the outside of the transmission rod (22). The top of the lifting seat (5) is symmetrically fixed to a vertical plate, and a worm (25) is rotatably connected between the two vertical plates via a bearing. The worm (25) meshes with the worm gear (23). A drive motor (24) is fixedly installed on the outside of the vertical plate inside the support cylinder (6), and the output shaft end of the drive motor (24) passes through the vertical plate and is fixedly connected to the worm (25). The top of the transmission rod (22) is fixedly connected to the support plate (7).

4. The engineering machinery operation calibration device according to claim 1, characterized in that: The top of the fixed base (8) is symmetrically provided with adjustment grooves (29). The top of the fixed base (8) is symmetrically provided with positioning plates (30). The bottom of the positioning plate (30) is integrally provided with a sliding block, and the sliding block is slidably connected in the adjustment groove (29). The side wall of the sliding block at the bottom of the positioning plate (30) is fixedly connected with a sliding rod (31), and the end of the sliding rod (31) slides through the fixed base (8). The outer side of the sliding rod (31) located outside the fixed base (8) is threaded with a nut. The outer side of the sliding rod (31) is located between the inner wall of the positioning plate (30) and the adjustment groove (29) and a support spring (32) is sleeved. The two ends of the support spring (32) are fixedly connected to the sliding block and the inner wall of the fixed base (8) respectively. The laser interferometer (9) is connected between the two positioning plates (30).

5. The engineering machinery operation calibration device according to claim 4, characterized in that: The positioning plate (30) is integrally provided with a fixing plate (33) on one side of the laser interferometer (9). The corresponding two side walls of the laser interferometer (9) are provided with fixing grooves (34). The fixing plate (33) is snapped into the fixing groove (34). One end of the laser interferometer (9) is in contact with the inner wall of the protective plate (10).

6. The engineering machinery operation calibration device according to claim 1, characterized in that: The top of the fixed seat (8) is fixedly connected to a positioning block (27), and the bottom end of the protective plate (10) is provided with a positioning groove. The positioning block (27) is snapped into the positioning groove. The surface of the protective plate (10) is symmetrically provided with fastening bolts (28) outside the positioning groove. The top of the fixed seat (8) is symmetrically provided with fixing holes outside the positioning block (27), and the end of the fastening bolt (28) is threaded into the fixing hole.

7. The engineering machinery operation calibration device according to claim 1, characterized in that: An electrical mounting cavity (16) for installing electrical components is provided inside the fixed box (4) between the two lifting cavities (18), and a cabinet door (17) is hinged to the surface of the fixed box (4) at the port of the electrical mounting cavity (16).

8. The engineering machinery operation calibration device according to claim 1, characterized in that: A gusseted cloth (3) for dust prevention is provided between the inner wall of the support base (2) and the side wall of the mounting base (15), and between the inner wall of the support plate (7) and the side wall of the fixing base (8).

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