Model test box size adjusting device and adjusting method for civil engineering

Abstract

The invention discloses a device and method for adjusting the size of a model test box for civil engineering, and belongs to the technical field of civil engineering, the device comprises a box body and a test unit arranged in the box body, the test unit comprises a bottom beam, a visual assembly, a telescopic assembly and a guide rail assembly, the visual assembly is connected to the upper portion of the bottom beam, the front end of the telescopic assembly is connected with the bottom beam and the visual assembly, the bottom of the telescopic assembly is connected to the guide rail assembly, the guide rail assembly is arranged at the bottom of the box body, and a size adjusting method is provided based on the device. According to the invention, a plurality of groups of telescopic rods connected by tie bars are arranged, and a plurality of groups of traction actuators capable of performing synchronous displacement control are matched to provide power to drive the whole structure to move on the linear guide rail at the bottom, so that the purpose of three-level size adjustment of a test space can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a size adjustment device and an adjustment method for a model test box for civil engineering. Background Art

[0002] In the fields of geotechnical engineering and geological engineering, physical model testing is a method suitable for studying complex problems such as the mechanism of landslide disasters and the interaction mechanism between landslides and engineering structures. Carrying out large-scale physical model tests can reduce the impact of size effects and boundary effects on the basis of reducing costs, and better reproduce the corresponding characteristics of the prototype landslide. Combined with reasonable physical model design, it helps to clarify the basic mechanism of the complex interaction between geological bodies and structures.

[0003] Depending on the test focus and test design, physical model tests may require different test space sizes. Existing frame model test boxes usually only have fixed test space sizes and cannot flexibly meet the needs of various tests, resulting in a certain degree of resource waste.

[0004] In view of the above problems, the present invention proposes a size adjustment device and method for a model test box for civil engineering. Summary of the invention

[0005] The object of the present invention is to provide a device and method for adjusting the size of a model test box for civil engineering, so as to solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides a size adjustment device for a model test box for civil engineering, comprising a box body and a test unit arranged inside the box body, the test unit comprising a bottom beam, a visual component, a telescopic component and a guide rail component, the visual component is connected to the top of the bottom beam, the front end of the telescopic component is respectively connected to the bottom beam and the visual component, the bottom of the telescopic component is connected to the guide rail assembly, and the guide rail assembly is arranged at the bottom of the box body.

[0007] Preferably, the visual component includes a visual pressure plate frame and tempered glass, and the tempered glass is fixedly connected to the front end of the visual pressure plate frame.

[0008] Preferably, the guide rail assembly comprises a plurality of linear guide rails, the plurality of linear guide rails are horizontally arranged at the bottom of the box, the bottom and both sides of the linear guide rails are provided with first embedded parts, the rear end of the linear guide rail and the rear wall of the box body, and the lower end of the linear guide rail and the bottom wall of the box body are connected by the first embedded parts, and the front end of the linear guide rail is connected to the crossbeam by the first embedded parts; The linear guide rail is provided with a slideway, and the slideway is provided with a fixed support and a plurality of movable guide supports, the fixed support is provided at one end close to the side wall of the box body, and the movable guide support is provided at one end away from the rear wall of the box body.

[0009] Preferably, the telescopic assembly comprises multiple rows of horizontally arranged telescopic rod groups and multiple traction actuators, the bottoms of the telescopic rod groups at the bottom layer are correspondingly connected to the fixed support and the movable guide support; the front ends of the telescopic rod groups in the bottom row are connected to the bottom beam, and the front ends of the telescopic rod groups in the remaining rows are connected to the visible pressure plate frame; The telescopic rod group includes multiple telescopic rods, and the arrangement form of the multiple telescopic rods is the same as the arrangement form of the linear guide rail. A horizontal tie rod and an oblique tie rod are connected between two adjacent telescopic rods in the same row, and a vertical tie rod is connected between two adjacent rows of telescopic rods.

[0010] Preferably, the telescopic rod is composed of a primary telescopic rod, a secondary telescopic rod and a tertiary telescopic rod which are connected in sequence; the primary telescopic rod and the secondary telescopic rod, as well as the secondary telescopic rod and the tertiary telescopic rod are connected via a U-shaped connecting plate and a fixing bolt; the other end of the primary telescopic rod is provided with an internally threaded sleeve, a pull rod is connected to the internally threaded sleeve, a front end of the internally threaded sleeve is connected to the visible pressure plate frame, and the other end of the tertiary telescopic rod is connected to the side of the box body via a second embedded part.

[0011] Preferably, the traction actuator is arranged between part of the transverse tie rod and the vertical tie rod, and the traction actuator comprises an actuator cylinder and a driving rod connected to the front end of the actuator cylinder, the driving rod is connected to a vertical connecting rod through a guide bracket, and the lower end of the vertical connecting rod is fixed to the transverse tie rod; the actuator cylinder is connected to the rear wall of the box body through a third embedded part; The guide bracket comprises a fixing plate and a fixing bolt.

[0012] Preferably, the driving rod includes a piston rod, a primary connecting rod, a secondary connecting rod and a tertiary connecting rod, one end of the piston rod is connected to the front end of the actuator cylinder, the other end of the piston rod is connected to the tertiary connecting rod, the secondary connecting rod and the primary connecting rod in sequence, the other end of the primary connecting rod is connected to a transverse connecting rod, both ends of the transverse connecting rod are connected to the vertical tie rod.

[0013] The present invention also proposes an adjustment method based on the size adjustment device of the model test box for civil engineering, comprising the following steps: S1. Remove the pull rod, remove the U-shaped connecting plate and fixing bolts between the secondary telescopic rod and the tertiary telescopic rod, and control the piston rod to retract by controlling the traction actuator so that the whole structure retracts toward the rear wall of the box; S2. Fix the disassembled U-shaped connecting plate and fixing bolts to the middle of the secondary telescopic rod, fix the pull rod to the box body, and complete the first size adjustment; S3, remove the pull rod, remove the U-shaped connecting plate and the fixing bolt installed in the middle of the secondary telescopic rod in step S2, remove the guide bracket between the tertiary connecting rod, the secondary connecting rod and the piston rod, then remove the tertiary connecting rod, extend the piston rod of the traction actuator, connect the piston rod with the secondary connecting rod, install the guide bracket to fix it, and retract the entire structure toward the rear wall of the box by controlling the traction actuator; S4, remove the U-shaped connecting plate and fixing bolts between the secondary telescopic rod and the primary telescopic rod, and retract the entire structure toward the rear wall of the box by controlling the traction actuator; S5, fix the U-shaped connecting plate and fixing bolts removed in step S4 to the middle position of the primary telescopic rod, fix the pull rod to the box body, and complete the second size adjustment; S6. Remove the pull rod, remove the U-shaped connecting plate and fixing bolts fixed to the middle of the primary telescopic rod, remove the guide bracket, remove the secondary connecting rod, extend the piston rod of the traction actuator, connect the piston rod to the primary connecting rod and install the guide bracket to fix it, retract the entire structure toward the rear wall of the box by controlling the traction actuator, fix the pull rod to the box, and complete the third size adjustment; Through the above steps, three-level size adjustment from the smallest test space to the largest test space can be achieved; similarly, according to the reverse steps, three-level size adjustment from the largest test space to the smallest test space can be achieved.

[0014] Therefore, the present invention provides a size adjustment device and method for a model test box for civil engineering. By setting up multiple sets of telescopic rods connected by tie rods and providing power through multiple sets of traction actuators that can perform synchronous displacement control, the overall structure is driven to move on the linear guide rail at the bottom, thereby achieving the purpose of three-level size adjustment of the test space.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 A top view of the structure of an embodiment of the present invention; Figure 3 A structural side view of an embodiment of the present invention; Figure 4 Schematic diagram of the structure of the guide rail assembly in an embodiment of the present invention; Figure 5 A schematic diagram of a portion of the structure of a linear guide rail in an embodiment of the present invention; Figure 6 Schematic diagram of the connection structure between the bottom beam and the telescopic rod group in an embodiment of the present invention; Figure 7 It is a schematic diagram of the connection structure between the visual component and the traction actuator and the telescopic rod group in an embodiment of the present invention; Figure 8 It is a structural schematic diagram of a traction actuator in an embodiment of the present invention; Fig. 9 It is a schematic diagram of the structure of the telescopic rod and the visual component in an embodiment of the present invention; Fig.10 Schematic diagram of the connection between the visual component and the primary telescopic rod in an embodiment of the present invention; Fig.11 This is a schematic diagram of the structure of a U-shaped connecting plate and fixing bolts in an embodiment of the present invention; Fig.12 It is a schematic diagram of the structure of the guide bracket in an embodiment of the present invention; Fig.13 Schematic diagram of the structure of the telescopic rod when the test space is the smallest in the initial state according to an embodiment of the present invention; Fig.14 It is a structural schematic diagram of the traction actuator when the test space is the smallest in the initial state in an embodiment of the present invention; Fig.15 This is a schematic diagram of the structure of the telescopic rod after adjustment in step S2 of an embodiment of the present invention; Fig.16 is a schematic structural diagram of a traction actuator after step S2 of an embodiment of the present invention; Fig.17 This is a schematic diagram of the structure of the telescopic rod after adjustment in step S3 of an embodiment of the present invention; Fig.18 It is a structural schematic diagram of the traction actuator after adjustment in step S3 of an embodiment of the present invention; Fig.19 This is a schematic diagram of the structure of the telescopic rod after adjustment in step S4 of an embodiment of the present invention; Fig. 20 It is a structural schematic diagram of the traction actuator after adjustment in step S4 of an embodiment of the present invention; Fig.21 This is a schematic diagram of the structure of the telescopic rod after adjustment in step S6 of an embodiment of the present invention; Fig. 22 It is a structural schematic diagram of the traction actuator after adjustment in step S6 of an embodiment of the present invention; Reference numerals: 1. Box; 2. Bottom beam; 3. Visible assembly; 31. Visible pressure plate frame; 32. Tempered glass; 4. Telescopic assembly; 41. Telescopic rod group; 411. Horizontal tie rod; 412. Oblique tie rod; 413. Vertical tie rod; 414. Primary telescopic rod; 415. Secondary telescopic rod; 416. Third telescopic rod; 417. U-shaped connecting plate; 418. Fixing bolt; 419. Internal threaded sleeve; 42. Traction actuator; 421 , actuator cylinder; 422, vertical connecting rod; 423, guide bracket; 424, piston rod; 425, primary connecting rod; 426, secondary connecting rod; 427, tertiary connecting rod; 428, transverse connecting rod; 43, pull rod; 44, second embedded part; 46, third embedded part; 5, guide rail assembly; 51, linear guide rail; 52, first embedded part; 53, slideway; 54, fixed support; 55, movable guide support; 6, crossbeam. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0019] Example like Figure 1-Figure 3 As shown, the present invention provides a size adjustment device for a model test box for civil engineering, comprising a box body 1 and a test unit arranged inside the box body 1, the test unit comprising a bottom beam 2, a visible component 3, a telescopic component 4 and a guide rail component 5, the visible component 3 is connected to the top of the bottom beam 2, the front end of the telescopic component 4 is respectively connected to the bottom beam 2 and the visible component 3, the bottom of the telescopic component 4 is connected to the guide rail component 5, and the guide rail component 5 is arranged at the bottom of the box body 1.

[0020] The visual assembly 3 includes a visual pressure plate frame 31 and a tempered glass 32. The tempered glass 32 is fixedly connected to the front end of the visual pressure plate frame 31. The tempered glass 32 is provided to facilitate observation and recording of the model test process. The bottom beam 2 provides support for the multiple sets of visual pressure plate frames 31 and tempered glass 32 above so that they can move as a whole under the traction of the subsequent traction actuator 42.

[0021] like Figure 4-Figure 12As shown, the guide rail assembly 5 includes a plurality of linear guide rails 51, which are arranged horizontally at the bottom of the box 1. The main structure of the linear guide rail 51 is composed of a plurality of sections of steel rails fixedly connected by bolts and nuts. The bottom and both sides of the linear guide rail 51 are provided with first embedded parts 52. The rear end of the linear guide rail 51 and the rear wall of the box 1, and the lower end of the linear guide rail 51 and the bottom wall of the box 1 are connected to the studs through the first embedded parts 52 for fixation. The front end of the linear guide rail 51 is connected to the crossbeam 6 through the first embedded parts 52. A slideway 53 is provided at the top of the linear guide rail 51. A fixed support 54 and a plurality of movable guide supports 55 are provided on the slideway 53 in a conventional manner. The movable guide support 55 can slide on the slideway 53, and the fixed support 54 is fixed. The fixed support 54 is provided at one end close to the side wall of the box 1, and the movable guide support 55 is provided at one end away from the rear wall of the box 1. The linear guide rail 51 is connected to the upper telescopic rod through a fixed support 54 and a movable guide support 55 to provide support and guidance.

[0022] The telescopic assembly 4 includes multiple rows of horizontally arranged telescopic rod groups 41 and multiple traction actuators 42. The bottom of the telescopic rod groups 41 on the bottom layer are correspondingly connected to the fixed support 54 and the movable guide support 55; the front end of the telescopic rod groups 41 in the bottom row is connected to the bottom beam 2, and the front ends of the telescopic rod groups 41 in the remaining rows are connected to the visible pressure plate frame 31, and the above connections are all connected by studs.

[0023] The telescopic rod group 41 includes multiple telescopic rods, and the arrangement of the multiple telescopic rods is the same as that of the linear guide rail 51. A transverse tie rod 411 and an oblique tie rod 412 are connected between two adjacent telescopic rods in the same row, and a vertical tie rod 413 is connected between two adjacent rows of telescopic rods. The transverse tie rod 411, the oblique tie rod 412 and the vertical tie rod 413 provide support and improve the stability of the overall structure.

[0024] The telescopic rod is composed of a first-stage telescopic rod 414, a second-stage telescopic rod 415 and a third-stage telescopic rod 416 connected in sequence, and the three are connected by contraction. The first-stage telescopic rod 414 and the second-stage telescopic rod 415, and the second-stage telescopic rod 415 and the third-stage telescopic rod 416 are connected by a detachable U-shaped connecting plate 417 and a fixing bolt 418. The other end of the first-stage telescopic rod 414 is connected by a bolt to an internal thread sleeve 419, and a pull rod 43 is detachably connected to the internal thread sleeve 419. The pull rod 43 fixes the front end of each row of telescopic rod groups 41 as a whole. The pull rod 43 at the edge is fixed to the side wall of the box body 1 to provide fixed support for the size adjustment device and improve the stability of the overall structure. The front end of the internal thread sleeve 419 is connected to the visible pressure plate frame 31 by bolts, and the other end of the third-stage telescopic rod 416 is connected to the side of the box body 1 through the second embedded part 44 and the stud.

[0025] The traction actuator 42 is arranged between part of the transverse tie rod 411 and the vertical tie rod 413. The traction actuator 42 includes an actuator cylinder 421 and a driving rod connected to the front end of the actuator cylinder 421. The driving rod is connected to a vertical connecting rod 422 through a guide bracket 423. The guide bracket 423 includes a fixing plate and a fixing bolt 418. The guide bracket 423 provides support and guidance for the driving rod and is fixed by a removable top fixing plate and a fixing screw at the top. The lower end of the vertical connecting rod 422 is fixed to the transverse tie rod 411; the actuator cylinder 421 is connected and fixed to the rear wall of the box body 1 through the third embedded part 46 and the stud; The driving rod includes a piston rod 424, a primary connecting rod 425, a secondary connecting rod 426 and a tertiary connecting rod 427. One end of the piston rod 424 is connected to the front end of the actuator cylinder 421. The control system of the traction actuator 42 can control the piston rod 424 to extend or retract the actuator cylinder 421. The other end of the piston rod 424 is connected to the tertiary connecting rod 427, the secondary connecting rod 426, and the primary connecting rod 425 in sequence. The other end of the primary connecting rod 425 is connected to a transverse connecting rod 428, and both ends of the transverse connecting rod 428 are connected to the vertical tie rod 413.

[0026] The adjustment method based on the size adjustment device of the model test box for civil engineering comprises the following steps: S1, such as Fig.13 and Fig.14 As shown, the test space is the smallest at this time. When adjusting the size, first remove the pull rod 43, remove the U-shaped connecting plate 417 and the fixing bolt 418 between the secondary telescopic rod 415 and the tertiary telescopic rod 416, and then control the piston rod to retract by controlling the traction actuator 42, so that the whole structure retracts toward the rear wall of the box body 1; S2, fix the disassembled U-shaped connecting plate 417 and fixing bolt 418 to the middle position of the secondary telescopic rod 415, and fix the pull rod 43 to the box body 1, as shown in FIG. Fig.15 , Fig.16 As shown, the first size adjustment is completed; S3, remove the pull rod 43, remove the U-shaped connecting plate 417 and the fixing bolt 418 installed in the middle of the secondary telescopic rod 415 in step S2, remove the guide bracket 423 between the tertiary connecting rod 427 and the secondary connecting rod 426 and the piston rod 424, then remove the tertiary connecting rod 427, extend the piston rod 424 of the traction actuator 42, connect the piston rod 424 with the secondary connecting rod 426, install the guide bracket 423 to fix it, and retract the entire structure toward the rear wall of the box body 1 by controlling the traction actuator 42, as shown in FIG. Fig.17 , Fig.18 As shown; S4, remove the U-shaped connecting plate 417 and the fixing bolt 418 between the secondary telescopic rod 415 and the primary telescopic rod 414, and retract the entire structure toward the rear wall of the box body 1 by controlling the traction actuator 42, as shown in FIG. Fig.19 , Fig. 20 As shown; S5, fix the U-shaped connecting plate 417 and the fixing bolt 418 removed in step S4 to the middle position of the primary telescopic rod 414, and fix the pull rod 43 to the box body 1 to complete the second size adjustment; S6, remove the pull rod 43, remove the U-shaped connecting plate 417 and the fixing bolt 418 fixed to the middle position of the primary telescopic rod 414, remove the guide bracket 423, remove the secondary connecting rod 426, extend the piston rod 424 of the traction actuator 42, connect the piston rod 424 with the primary connecting rod 425 and install the guide bracket 423 to fix it, control the traction actuator 42 to retract the entire structure toward the rear wall of the box body 1, and fix the pull rod 43 to the box body 1, as shown in FIG. Fig.21 , Fig. 22 As shown, the third size adjustment is completed; Through the above steps, three-level size adjustment from the smallest test space to the largest test space can be achieved; similarly, according to the reverse steps, three-level size adjustment from the largest test space to the smallest test space can be achieved.

[0027] Therefore, the present invention provides a size adjustment device and method for a model test box for civil engineering. By setting up multiple sets of telescopic rods connected by tie rods and providing power through multiple traction actuators that can perform synchronous displacement control, the overall structure is driven to move on the linear guide rail at the bottom, thereby achieving the purpose of three-level size adjustment of the test space.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A size adjustment device for a model test box for civil engineering, characterized in that: The invention comprises a box body and a test unit arranged inside the box body, wherein the test unit comprises a bottom beam, a visible component, a telescopic component and a guide rail component, wherein the visible component is connected above the bottom beam, the front end of the telescopic component is respectively connected to the bottom beam and the visible component, the bottom of the telescopic component is connected to the guide rail component, and the guide rail component is arranged at the bottom of the box body.

2. The size adjustment device for a model test box for civil engineering according to claim 1, characterized in that: The visual component comprises a visual pressure plate frame and tempered glass, and the tempered glass is fixedly connected to the front end of the visual pressure plate frame.

3. The size adjustment device for a model test box for civil engineering according to claim 2, characterized in that: The guide rail assembly includes a plurality of linear guide rails, which are horizontally arranged at the bottom of the box body, and the bottom and both sides of the linear guide rails are provided with first embedded parts, and the rear end of the linear guide rail and the rear wall of the box body, and the lower end of the linear guide rail and the bottom wall of the box body are connected by the first embedded parts, and the front end of the linear guide rail is connected to the crossbeam through the first embedded parts; The linear guide rail is provided with a slideway, and the slideway is provided with a fixed support and a plurality of movable guide supports, the fixed support is provided at one end close to the side wall of the box body, and the movable guide support is provided at one end away from the rear wall of the box body.

4. The size adjustment device for a model test box for civil engineering according to claim 3, characterized in that: The telescopic assembly includes multiple rows of horizontally arranged telescopic rod groups and multiple traction actuators, the bottom of the telescopic rod group at the bottom layer is correspondingly connected to the fixed support and the movable guide support; the front end of the telescopic rod group in the bottom row is connected to the bottom beam, and the front ends of the telescopic rod groups in the remaining rows are connected to the visible pressure plate frame; The telescopic rod group includes multiple telescopic rods, and the arrangement form of the multiple telescopic rods is the same as the arrangement form of the linear guide rail. A horizontal tie rod and an oblique tie rod are connected between two adjacent telescopic rods in the same row, and a vertical tie rod is connected between two adjacent rows of telescopic rods.

5. The size adjustment device for a model test box for civil engineering according to claim 4, characterized in that: The telescopic rod is composed of a primary telescopic rod, a secondary telescopic rod and a tertiary telescopic rod connected in sequence. The primary telescopic rod and the secondary telescopic rod, as well as the secondary telescopic rod and the tertiary telescopic rod are connected by a U-shaped connecting plate and a fixing bolt. The other end of the primary telescopic rod is provided with an internal threaded sleeve, and a pull rod is connected to the internal threaded sleeve. The front end of the internal threaded sleeve is connected to the visible pressure plate frame, and the other end of the tertiary telescopic rod is connected to the side of the box body through a second embedded part.

6. The size adjustment device for a model test box for civil engineering according to claim 5, characterized in that: The traction actuator is arranged between part of the transverse tie rod and the vertical tie rod, and includes an actuator cylinder and a driving rod connected to the front end of the actuator cylinder. The driving rod is connected to a vertical connecting rod through a guide bracket, and the lower end of the vertical connecting rod is fixed to the transverse tie rod; the actuator cylinder is connected to the rear wall of the box body through a third embedded part.

7. The size adjustment device for a model test box for civil engineering according to claim 6, characterized in that: The driving rod includes a piston rod, a primary connecting rod, a secondary connecting rod and a tertiary connecting rod. One end of the piston rod is connected to the front end of the actuator cylinder, and the other end of the piston rod is connected to the tertiary connecting rod, the secondary connecting rod and the primary connecting rod in sequence. The other end of the primary connecting rod is connected to a transverse connecting rod, and both ends of the transverse connecting rod are connected to the vertical tie rod.

8. The adjustment method of the size adjustment device for a model test box for civil engineering according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Remove the pull rod, remove the U-shaped connecting plate and fixing bolts between the secondary telescopic rod and the tertiary telescopic rod, and control the piston rod to retract by controlling the traction actuator so that the whole structure retracts toward the rear wall of the box; S2. Fix the disassembled U-shaped connecting plate and fixing bolts to the middle of the secondary telescopic rod, fix the pull rod to the box body, and complete the first size adjustment; S3, remove the pull rod, remove the U-shaped connecting plate and the fixing bolt installed in the middle of the secondary telescopic rod in step S2, remove the guide bracket between the tertiary connecting rod, the secondary connecting rod and the piston rod, then remove the tertiary connecting rod, extend the piston rod of the traction actuator, connect the piston rod with the secondary connecting rod, install the guide bracket to fix it, and retract the entire structure toward the rear wall of the box by controlling the traction actuator; S4, remove the U-shaped connecting plate and fixing bolts between the secondary telescopic rod and the primary telescopic rod, and retract the entire structure toward the rear wall of the box by controlling the traction actuator; S5, fix the U-shaped connecting plate and fixing bolts removed in step S4 to the middle position of the primary telescopic rod, fix the pull rod to the box body, and complete the second size adjustment; S6. Remove the pull rod, remove the U-shaped connecting plate and fixing bolts fixed to the middle of the first telescopic rod, remove the guide bracket, remove the second-level connecting rod, extend the piston rod of the traction actuator, connect the piston rod to the first-level connecting rod and install the guide bracket to fix it, control the traction actuator to retract the entire structure toward the rear wall of the box, fix the pull rod to the box, and complete the third size adjustment.

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