Measuring device for geotechnical engineering investigation

Abstract

The utility model discloses a measuring device for geotechnical engineering investigation, which relates to the technical field of geotechnical engineering investigation and comprises a moving trolley, a bearing frame is arranged at the top of the moving trolley, a drilling assembly is arranged in the middle of the bearing frame, a supporting assembly is arranged on one side of the top of the moving trolley, and the supporting assembly comprises a mounting frame. A mounting frame is arranged in the mounting frame, a driving gear is arranged on one side of the mounting frame, an ejection sliding rod and an ejection rod are oppositely arranged on the two sides of the driving gear, moving wheels are arranged at the bottom of the ejection sliding rod, and a supporting bottom plate is arranged at the bottom of the ejection rod. According to the device, the device can be conveniently moved at different positions through the arranged moving wheels, and different heights of the ejection sliding rod and the ejection rod can be adjusted through rotation of the arranged driving gear, so that the moving wheels can be conveniently folded, the supporting bottom plate can be conveniently descended, and the device and the moving wheels are prevented from sliding in the working process.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering investigation, in particular to a measuring device for geotechnical engineering investigation. Background Art

[0002] Geotechnical investigation is the process of identifying engineering geological conditions, analyzing existing geological problems, and conducting an engineering geological assessment of the construction area. Geotechnical investigation equipment is specialized equipment used to collect geological and soil data, primarily used to assess foundation conditions, soil properties, and groundwater conditions. This information is crucial for construction projects, as it helps engineers determine design parameters for building foundations and ensure the safety and stability of the structure.

[0003] The patent with publication number CN 211527889 U mentions a measuring device for geotechnical engineering investigation. The patent is easy to move by providing a support device, and the height of the entire measuring device can be freely adjusted, which is convenient for the operator to operate and use. By adjusting the position of the fastening bolts installed on the No. 1 support plate and the No. 2 support plate, the entire measuring device can be raised and lowered to a suitable position, and the sliding wheels provided are convenient for moving the entire measuring device to a suitable position for easy movement. However, the patent also has the following problems: when the device is drilling into rock and soil, the sliding wheels at the bottom of the device are prone to slipping during the vibration process, thereby affecting the progress of the drilling work, and the stable support effect of the device is not ideal. Therefore, it is necessary to provide a measuring device for geotechnical engineering investigation to solve the problem. Summary of the Invention

[0004] The main purpose of the utility model is to provide a measuring device for geotechnical engineering investigation, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A measuring device for geotechnical engineering investigation includes a mobile trolley, a bearing frame is provided on the top of the mobile trolley, a drilling assembly is provided in the middle of the bearing frame, and a support assembly is provided on one side of the top of the mobile trolley;

[0007] The drilling assembly includes a driving motor, a screw is provided at the bottom of the driving motor, a support slide is provided on the outside of the screw, a drilling group is provided at the bottom of the support slide, and a spiral transmission paddle is provided on the outer wall of the drilling group, a driven pulley is provided at the top of the drilling group, and a connecting belt is provided on the outside of the driven pulley, a driving pulley is provided at one end of the connecting belt, and a motor is provided on the top of the driving pulley;

[0008] The support assembly includes a mounting frame, a mounting frame is provided inside the mounting frame, a servo motor is provided on one side of the mounting frame, and a driving gear is provided on the other side of the mounting frame, an ejection slide is provided on one side of the driving gear, and an ejection rod is provided on the other side of the driving gear, a moving wheel is provided at the bottom of the ejection slide, and a connecting rod is provided at the bottom of the ejection rod, and a supporting base plate is provided at the bottom end of the connecting rod.

[0009] Preferably, the bottom of the driving motor is connected to the middle of the top of the supporting frame by bolts, and the output end of the driving motor is connected to a screw rod, the end of the screw rod close to the driving motor is installed in the middle of the top of the supporting frame through a bearing, and the bottom end of the screw rod is connected to the top of the moving trolley, and a support slide is provided on the outer wall of the screw rod, and the two ends of the support slide are slidably connected to the inner walls on both sides of the supporting frame.

[0010] Preferably, a drilling group is slidably connected to the middle of the bottom of the supporting slide, and the supporting slide is rotatably connected to the drilling group. An empty slot is provided in the middle of the drilling group, and the screw rod is inserted into the inside of the drilling group. A spiral transmission paddle is fixedly connected to the outer wall of the drilling group, and the bottom end of the drilling group is connected to the middle of the mobile trolley. A through slot is provided in the middle of the mobile trolley, and a sampling frame is installed on the top of the mobile trolley, and the through slot passes through the middle of the sampling frame, and the outer wall of the spiral transmission paddle is in contact with the inner wall of the through slot.

[0011] Preferably, a driven pulley is clamped on the outer wall of one end of the drilling group close to the supporting slide, and a connecting belt is sleeved on the middle outer wall of the driven pulley, and a driving pulley is sleeved on the end of the connecting belt away from the driven pulley, and the driving pulley is located below the supporting slide, and a motor is installed on the top of one side of the supporting slide by bolts, and the output end of the motor is transmission-connected to the driving pulley.

[0012] Preferably, the bottom of the mounting frame is connected to the top of the mobile trolley by bolts, and there are four mounting frames, which are symmetrically distributed at the four corners of the top of the mobile trolley. The mounting frame is arranged adjacent to the supporting frame, and the inner walls on both sides of the mounting frame are connected with mounting frames by bolts, and there are two mounting frames, which are symmetrically distributed on both sides of the mounting frame. The two ends of the mounting frame are connected to the inner walls on both sides of the mounting frame, and a servo motor is installed in the middle of the side of the mounting frame by bolts.

[0013] Preferably, the output end of the servo motor is transmission-connected with a driving gear, and both sides of the driving gear are connected to the mounting brackets through bearings, the driving gear is located between the two mounting brackets, a ejection slide is provided on one side of the driving gear, and the bottom end of the ejection slide passes through the mounting frame and the moving trolley, a ejection rod is provided on the side of the driving gear away from the ejection slide, and the ejection slide and the ejection rod are symmetrically distributed on both sides of the driving gear, a transmission rack is fixedly connected to the side of the ejection rod close to the driving gear, and there are two transmission racks, which are symmetrically distributed on the side of the ejection rod and the side of the ejection slide, and the driving gear and the two transmission racks are meshed with each other.

[0014] Preferably, a slide groove is provided at the bottom of the mounting frame, which is respectively arranged corresponding to the ejection slide bar and the ejection rod, the slide groove passes through the bottom of the movable trolley, the top of the ejection slide bar is fixedly connected to a limiting top plate, and there are four limiting top plates, which are symmetrically distributed on both sides of the top of the ejection slide bar and the top of the ejection rod, and the bottom end of the ejection slide bar is installed with a moving wheel by bolts, and the moving wheel is located below the movable trolley, and the bottom of the movable trolley is connected with a stabilizing bar by bolts, and the moving wheel is arranged adjacent to the stabilizing bar.

[0015] Preferably, the bottom of the ejection rod is fixedly connected to a connecting rod, and the bottom of the connecting rod is installed with a supporting base plate by bolts. The supporting base plate is located in the middle of the bottom of the mobile trolley, and the middle of the supporting base plate is corresponding to the through groove in the middle of the mobile trolley, and there are two through grooves, which are symmetrically distributed in the middle of the mobile trolley and the middle of the supporting base plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The movable wheels are provided to facilitate the movement of the device to different positions, and the driving gear is rotated to adjust the ejection slide bar and the ejection rod to different heights, thereby facilitating the retraction of the movable wheels and the lowering of the supporting base plate, improving the stability of the device during use, and preventing the device and the movable wheels from sliding during operation, which affects the working stability.

[0018] 2. The supporting slide is provided to drive the drilling group to descend along the screw rod, thereby facilitating the vertical descent of the drilling group and preventing the drilling group from tilting during use, which affects the stability of the device. The screw rod is connected to the inside of the drilling group, further improving the stability of the drilling group.

[0019] 3. The driven pulley and the drilling group are driven to rotate by the connecting belt, so that the drilling group and the spiral transmission paddle can drill and sample the rock and soil. The rock and soil are transmitted by the spiral transmission paddle, and the transmitted rock and soil are collected by the sampling frame, which is convenient for sampling and testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a first-perspective stereoscopic view of the entire device of the utility model.

[0022] Figure 2 This is a second perspective stereogram of the entire device of the utility model.

[0023] Figure 3 This utility model Figure 2 Schematic diagram of the structure enlarged at point A in the middle.

[0024] Figure 4 It is a structural diagram of the support assembly of the utility model.

[0025] In the figure: 1. Mobile trolley; 2. Carrying frame; 3. Drilling assembly; 4. Driving motor; 5. Screw; 6. Support slide; 7. Motor; 8. Driving pulley; 9. Driven pulley; 10. Connecting belt; 11. Drilling group; 12. Screw transmission paddle; 13. Sampling frame; 14. Support assembly; 15. Mounting frame; 16. Mounting frame; 17. Servo motor; 18. Driving gear; 19. Ejector slide; 20. Transmission rack; 21. Ejector rod; 22. Slide; 23. Connecting rod; 24. Moving wheel; 25. Support bottom plate; 26. Limiting top plate; 27. Through slot; 28. Stabilizing bar. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 4 As shown, a measuring device for geotechnical engineering investigation includes a mobile trolley 1, a supporting frame 2 is provided on the top of the mobile trolley 1, a drilling assembly 3 is provided in the middle of the supporting frame 2, and a supporting assembly 14 is provided on one side of the top of the mobile trolley 1.

[0028] Specifically, the drilling assembly 3 includes a driving motor 4 , a screw rod 5 is provided at the bottom of the driving motor 4 , a supporting slide 6 is provided outside the screw rod 5 , and a drilling group 11 is provided at the bottom of the supporting slide 6 .

[0029] A spiral transmission paddle 12 is provided on the outer wall of the drilling group 11, a driven pulley 9 is provided at the top of the drilling group 11, a connecting belt 10 is provided on the outside of the driven pulley 9, a driving pulley 8 is provided at one end of the connecting belt 10, and a motor 7 is provided on the top of the driving pulley 8.

[0030] The bottom of the driving motor 4 is connected to the top middle of the supporting frame 2 by bolts, and the downward output end of the driving motor 4 is connected to the screw rod 5. The end of the screw rod 5 close to the driving motor 4 is installed in the top middle of the supporting frame 2 through a bearing, and the bottom end of the screw rod 5 is connected to the top of the moving trolley 1. A support slide 6 is sleeved on the outer wall of the screw rod 5, and the two ends of the support slide 6 are slidably connected to the inner walls on both sides of the supporting frame 2. A drilling group 11 is connected to the bottom middle of the support slide 6, and the support slide 6 is further rotatably connected to the drilling group 11. An empty slot is opened in the middle of the drilling group 11, and the screw rod 5 is inserted into the inside of the drilling group 11. A spiral transmission paddle 12 is fixedly connected to the outer wall of the drilling group 11, and the bottom end of the drilling group 11 is connected to the middle of the moving trolley 1.

[0031] A through slot 27 is provided in the middle of the mobile cart 1 , and a sampling frame 13 is installed on the top of the mobile cart 1 . The through slot 27 runs through the middle of the sampling frame 13 , and the outer wall of the spiral transmission paddle 12 contacts the inner wall of the through slot 27 .

[0032] Preferably, a driven pulley 9 is clamped on the outer wall of one end of the drilling group 11 close to the support slide 6, a connecting belt 10 is sleeved on the middle outer wall of the driven pulley 9, and a driving pulley 8 is sleeved on the end of the connecting belt 10 away from the driven pulley 9, and the driving pulley 8 is located below the support slide 6.

[0033] Furthermore, a motor 7 is mounted on the top of one side of the supporting slide plate 6 via bolts, and the output end of the motor 7 is transmission-connected to the driving pulley 8 .

[0034] The support slide 6 drives the drilling assembly 11 down along the screw 5, facilitating vertical descent of the drilling assembly 11 and preventing it from tilting during use, which could affect the stability of the device. The screw 5 is connected to the interior of the drilling assembly 11, further improving its stability. A connecting belt 10 drives the driven pulley 9 and the drilling assembly 11 to rotate. The drilling assembly 11 and the spiral transmission paddle 12 drill and sample the rock and soil. The spiral transmission paddle 12 transmits the rock and soil, and the sampling frame 13 collects the transmitted rock and soil, facilitating sampling and testing.

[0035] See also Figure 1 、 Figure 2 、 Figure 4 As shown, the support assembly 14 includes a mounting frame 15, a mounting frame 16 is provided inside the mounting frame 15, a servo motor 17 is provided on one side of the mounting frame 16, a driving gear 18 is provided on the other side of the mounting frame 16, an ejection slide 19 is provided on one side of the driving gear 18, an ejection rod 21 is provided on the other side of the driving gear 18, a moving wheel 24 is provided at the bottom of the ejection slide 19, a connecting rod 23 is provided at the bottom of the ejection rod 21, a supporting base plate 25 is provided at the bottom end of the connecting rod 23 by bolts, and the bottom of the mounting frame 15 is connected to the top of the moving trolley 1 by bolts.

[0036] Furthermore, there are four mounting frames 15, symmetrically distributed at the top corners of the mobile cart 1. The mounting frames 15 are positioned adjacent to the carrier frame 2, and mounting frames 16 are bolted to the inner walls of each side of the mounting frame 15. There are two mounting frames 16, symmetrically distributed on either side of the mounting frame 15. The ends of the mounting frames 16 are connected to the inner walls of the mounting frame 15. A servo motor 17 is bolted to the middle of the side of the mounting frame 16. The output end of the servo motor 17 is connected to a driving gear 18, and the two sides of the driving gear 18 are connected to the mounting frames 16 via bearings. The driving gear 18 is located between the two mounting frames 16. The bottom end of the ejector slide 19 passes through the mounting frame 15 and the mobile cart 1. An ejector rod 21 is provided on the side of the driving gear 18 away from the ejector slide 19. The ejector slide 19 and the ejector rod 21 are symmetrically distributed on both sides of the driving gear 18. A transmission rack 20 is fixedly connected to the side of the ejector rod 21 close to the driving gear 18. There are two transmission racks 20, which are symmetrically distributed on the side of the ejector rod 21 and the side of the ejector slide 19 respectively. The driving gear 18 and the two transmission racks 20 are engaged with each other.

[0037] In addition, a slide groove 22 is provided at the bottom of the mounting frame 15, and there are four slide grooves 22, which are respectively arranged corresponding to the ejection slide bar 19 and the ejection rod 21. The slide groove 22 passes through the bottom of the mobile trolley 1, and the top of the ejection slide bar 19 is fixedly connected to the limiting top plate 26, and there are four limiting top plates 26, which are symmetrically distributed on both sides of the top of the ejection slide bar 19 and the top of the ejection rod 21.

[0038] The bottom of the mobile trolley 1 is connected to a stabilizer bar 28 by bolts, and the mobile wheel 24 is arranged adjacent to the stabilizer bar 28. The support base plate 25 is located in the middle of the bottom of the mobile trolley 1, and the middle of the support base plate 25 is arranged corresponding to the through groove 27 in the middle of the mobile trolley 1. There are two through grooves 27, which are symmetrically distributed in the middle of the mobile trolley 1 and the middle of the support base plate 25. The mobile wheel 24 is provided to facilitate the movement of the device to different positions, and the driving gear 18 is rotated to achieve the adjustment of the ejection slide bar 19 and the ejection rod 21 to different heights, thereby facilitating the retraction of the mobile wheel 24 and the lowering of the support base plate 25, thereby improving the stability of the device during use, and preventing the device and the mobile wheel 24 from sliding during work, affecting the working stability.

[0039] The utility model is a measuring device for geotechnical engineering survey. When in use, the moving wheel 24 at the bottom of the moving trolley 1 contacts the ground, pushing the moving trolley 1 to move. After moving to a suitable position, the servo motor 17 is provided to drive the driving gear 18 to rotate. The two sides of the driving gear 18 are respectively engaged with the transmission rack 20 on the side of the ejection slide 19 and the transmission rack 20 on the side of the ejection rod 21, so that the driving gear 18 rotates counterclockwise, causing the transmission rack 20 to drive the ejection slide 19 to move upward, and the transmission rack 20 on the side of the ejection rod 21 drives the ejection rod 21 to move downward, so that the ejection slide 19 drives the moving wheel 24 to separate from the ground, and the ejection rod 21 drives the connecting rod 23 and the support base plate 25 to descend. The bottom of the support base plate 25 contacts the ground, thereby achieving stable support for the device. The stabilizing bar 28 provides temporary support for the device during adjustment. The through groove 27 facilitates the subsequent drilling group 11 to drill holes, and then the provided driving motor 4 drives the screw 5 to rotate, so that the support slide 6 drives the drilling group 11 to descend along the screw 5, and at the same time, the motor 7 at one end of the support slide 6 drives the active pulley 8 to rotate, so that the connecting belt 10 on the outer wall of the active pulley 8 drives the driven pulley 9 to rotate, and the driven pulley 9 is clamped together with the drilling group 11, so that the driven pulley 9 drives the drilling group 11 to rotate at the bottom of the support slide 6 to realize drilling of rock and soil. At the same time, a spiral transmission paddle 12 is installed on the outer wall of the drilling group 11, and the spiral transmission paddle 12 realizes the transmission of rock and soil, so that the rock and soil are transmitted to the inside of the sampling frame 13, which is convenient for subsequent sampling and detection, and improves the convenience of use of the device.

[0040] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A measuring device for geotechnical engineering investigation, comprising a mobile vehicle (1), characterized in that: A carrier frame (2) is provided on the top of the mobile trolley (1), and a drilling assembly (3) is provided in the middle of the carrier frame (2); a support assembly (14) is provided on one side of the top of the mobile trolley (1); The drilling assembly (3) includes a driving motor (4), a screw rod (5) is provided at the bottom of the driving motor (4), a supporting slide (6) is provided on the outside of the screw rod (5), a drilling group (11) is provided at the bottom of the supporting slide (6), and a spiral transmission paddle (12) is provided on the outer wall of the drilling group (11), a driven pulley (9) is provided at the top of the drilling group (11), and a connecting belt (10) is provided on the outside of the driven pulley (9), a driving pulley (8) is provided at one end of the connecting belt (10), and a motor (7) is provided on the top of the driving pulley (8); The support assembly (14) includes a mounting frame (15), a mounting frame (16) is provided inside the mounting frame (15), a servo motor (17) is provided on one side of the mounting frame (16), and a driving gear (18) is provided on the other side of the mounting frame (16), an ejection slide (19) is provided on one side of the driving gear (18), and an ejection rod (21) is provided on the other side of the driving gear (18), a moving wheel (24) is provided at the bottom of the ejection slide (19), and a connecting rod (23) is provided at the bottom of the ejection rod (21), and a supporting base plate (25) is provided at the bottom end of the connecting rod (23).

2. A geotechnical engineering survey measuring device according to claim 1, characterized in that: The bottom of the driving motor (4) is connected to the middle of the top of the carrier frame (2) by bolts, and the output end of the driving motor (4) is connected to a screw rod (5) for transmission. The end of the screw rod (5) close to the driving motor (4) is installed in the middle of the top of the carrier frame (2) through a bearing, and the bottom end of the screw rod (5) is connected to the top of the moving trolley (1). A supporting slide plate (6) is sleeved on the outer wall of the screw rod (5), and the two ends of the supporting slide plate (6) are slidably connected to the inner walls of both sides of the carrier frame (2).

3. A geotechnical engineering survey measuring device according to claim 2, characterized in that: The middle of the bottom of the supporting slide plate (6) is slidably connected to the drilling group (11), and the supporting slide plate (6) is rotatably connected to the drilling group (11). An empty slot is provided in the middle of the drilling group (11), and the screw rod (5) is inserted into the interior of the drilling group (11). A spiral transmission paddle (12) is fixedly connected to the outer wall of the drilling group (11), and the bottom end of the drilling group (11) is connected to the middle of the mobile trolley (1). A through slot (27) is provided in the middle of the mobile trolley (1), and a sampling frame (13) is installed on the top of the mobile trolley (1), and the through slot (27) passes through the middle of the sampling frame (13), and the outer wall of the spiral transmission paddle (12) is in contact with the inner wall of the through slot (27).

4. A geotechnical engineering survey measuring device according to claim 3, characterized in that: A driven pulley (9) is clamped on the outer wall of one end of the drilling group (11) close to the supporting slide (6), and a connecting belt (10) is sleeved on the middle outer wall of the driven pulley (9). A driving pulley (8) is sleeved on the end of the connecting belt (10) away from the driven pulley (9), and the driving pulley (8) is located below the supporting slide (6). A motor (7) is installed on the top of one side of the supporting slide (6) by bolts, and the output end of the motor (7) is transmission-connected to the driving pulley (8).

5. The measuring device for geotechnical engineering investigation according to claim 1, characterized in that: The bottom of the mounting frame (15) is connected to the top of the mobile trolley (1) by bolts, and there are four mounting frames (15), which are symmetrically distributed at the four corners of the top of the mobile trolley (1). The mounting frame (15) is arranged adjacent to the carrier frame (2). The inner walls on both sides of the mounting frame (15) are connected to mounting frames (16) by bolts, and there are two mounting frames (16), which are symmetrically distributed on both sides of the mounting frame (15). The two ends of the mounting frame (16) are connected to the inner walls on both sides of the mounting frame (15), and a servo motor (17) is installed in the middle of the side of the mounting frame (16) by bolts.

6. A geotechnical engineering survey measuring device according to claim 5, characterized in that: The output end of the servo motor (17) is connected to a driving gear (18) through a transmission, and both sides of the driving gear (18) are connected to the mounting frame (16) through bearings. The driving gear (18) is located between the two mounting frames (16). A ejection slide (19) is provided on one side of the driving gear (18), and the bottom end of the ejection slide (19) passes through the mounting frame (15) and the moving trolley (1). A ejection rod (21) is provided on the side of the driving gear (18) away from the ejection slide (19), and the ejection slide (19) and the ejection rod (21) are symmetrically distributed on both sides of the driving gear (18). The ejection rod (21) is fixedly connected to a transmission rack (20) on the side close to the driving gear (18), and there are two transmission racks (20), which are symmetrically distributed on the side of the ejection rod (21) and the side of the ejection slide (19). The driving gear (18) and the two transmission racks (20) are meshed with each other.

7. A geotechnical engineering survey measuring device according to claim 6, characterized in that: The bottom of the mounting frame (15) is provided with a slide groove (22), which is respectively arranged corresponding to the ejection slide bar (19) and the ejection rod (21). The slide groove (22) passes through the bottom of the movable trolley (1). The top of the ejection slide bar (19) is fixedly connected to a limiting top plate (26), and there are four limiting top plates (26), which are symmetrically distributed on both sides of the top of the ejection slide bar (19) and the top of the ejection rod (21). The bottom end of the ejection slide bar (19) is installed with a moving wheel (24) by bolts, and the moving wheel (24) is located below the movable trolley (1). The bottom of the movable trolley (1) is connected with a stabilizing rod (28) by bolts, and the moving wheel (24) is arranged adjacent to the stabilizing rod (28).

8. The measuring device for geotechnical engineering investigation according to claim 7, characterized in that: The bottom of the ejection rod (21) is fixedly connected to a connecting rod (23), and the bottom of the connecting rod (23) is fixed with a supporting base plate (25) by means of bolts. The supporting base plate (25) is located in the middle of the bottom of the moving trolley (1), and the middle of the supporting base plate (25) is arranged corresponding to the through groove (27) in the middle of the moving trolley (1). There are two through grooves (27), which are symmetrically distributed in the middle of the moving trolley (1) and the middle of the supporting base plate (25).

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