Arch building supporting device and method for underground coal mine chamber

Abstract

The invention belongs to the technical field of coal mine equipment, and particularly discloses a coal mine underground chamber arch building supporting device and a building method. The coal mine underground chamber arch building supporting device comprises a walking assembly, a top supporting assembly, an upper lateral wall supporting assembly and a lower lateral wall supporting assembly. The top supporting assembly is arranged on the walking assembly. The two upper side wall supporting assemblies are arranged on the two sides of the top supporting assembly in the width direction correspondingly. The two groups of lower lateral wall supporting assemblies are respectively arranged on two sides of the walking assembly in the width direction, and are positioned below the two groups of upper lateral wall supporting assemblies in a one-to-one correspondence manner; the top supporting assembly, the upper lateral wall supporting assembly and the lower lateral wall supporting assembly all have an extending state and a retracting state, and in the extending state, the top supporting assembly, the upper lateral wall supporting assembly and the lower lateral wall supporting assembly form a supporting splicing plate matched with the section shape of the top and the section shape of the lateral wall of the chamber, so that laying is conducted through the supporting splicing plate. The bamboo sword can be repeatedly used, the cost is reduced, and the supporting efficiency of the bamboo sword is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine equipment, and in particular relates to a masonry support device and a masonry method for an underground coal mine chamber. Background Art

[0002] In the related art, in the masonry support process of underground coal mine chambers, masonry and formwork are usually used. During the masonry support process, the masonry and formwork need to be frequently removed, which is labor-intensive and has low work efficiency. In addition, when masonry in different chambers, different masonry specifications are required, so masonry of different specifications needs to be processed, resulting in serious material waste, increased costs, and reduced masonry support efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a masonry support device for a coal mine chamber, which can be reused, helps reduce costs, and improves masonry support efficiency.

[0004] The embodiment of the present invention further provides a method for laying bricks in a chamber in an underground coal mine.

[0005] The coal mine underground chamber masonry support device of the embodiment of the present invention includes: a walking assembly, which can walk along the chamber floor; a top support assembly, which is arranged on the walking assembly; an upper side support assembly, wherein the upper side support assembly is provided in two groups, and the two groups of upper side support assemblies are respectively provided on both sides in the width direction of the top support assembly; a lower side support assembly, wherein the lower side support assembly is provided in two groups, and the two groups of lower side support assemblies are respectively provided on both sides in the width direction of the walking assembly, and are located one by one below the two groups of upper side support assemblies; the top support assembly, the upper side support assembly and the lower side support assembly all have an extended state and a retracted state, in the extended state, the top support assembly, the upper side support assembly and the lower side support assembly form a support splicing plate that matches the cross-sectional shape of the top and side walls of the chamber, so that masonry can be carried out through the support splicing plate.

[0006] By setting up a walking assembly, the overall movement can be facilitated. A top support assembly and two groups of lower side support assemblies are set on the walking assembly, and a group of upper side support assemblies are set on both sides of the top support assembly. When the top support assembly, the upper side support assembly and the lower side support assembly are all in an extended state, the top support assembly, the upper side support assembly and the lower side support assembly form a support splicing plate that matches the cross-sectional shape of the top and side of the chamber. The support splicing plate can be used as a mortar to carry out masonry operations. When the masonry operations are completed, the top support assembly, the upper side support assembly and the lower side support assembly can be controlled to be in a retracted state to complete the removal of the support splicing plate so that the next section of masonry operations can be carried out. The top support assembly, the upper side support assembly and the lower side support assembly can all be reused, which can reduce costs and improve work efficiency.

[0007] In this embodiment, the top support assembly includes a first telescopic drive member and a top template. The first telescopic drive member is arranged on the walking assembly, and the top template is arranged on the execution end of the first telescopic drive member. The first telescopic drive member can drive the top template to extend or retract.

[0008] In this embodiment, the upper side help support assembly includes a second telescopic driving member and an upper side help template, the second telescopic driving member is arranged on the top template, the upper side help template is arranged on the top template and is movable relative to the top template, and the upper side help template is connected to the second telescopic driving member to drive the upper side help template to extend or retract through the second telescopic driving member.

[0009] In this embodiment, the second telescopic driving member includes a rotary driving member and a driving gear. The rotary driving member is arranged on the top template. The top template has a cavity with openings at both ends. The driving gear is rotatably connected in the cavity via a rotating shaft. The rotating shaft is connected to the output end of the rotary driving member. The upper side template is at least partially located in the cavity. The upper side template has driven teeth meshing with the driving gear.

[0010] In this embodiment, the inner wall of the cavity is provided with a guide groove, and the upper side help plate has a guide protrusion matched and connected to the guide groove.

[0011] In this embodiment, the cross-sectional shape of the top template is arc-shaped, the cross-sectional shape of the upper side template matches the cross-sectional shape of the top template, and the arc length of the upper side template is less than or equal to 1 / 2 of the arc length of the top template.

[0012] In this embodiment, the coal mine underground chamber masonry support device also includes a limiting member, which includes a first limiting portion and a second limiting portion. The first limiting portion is arranged on the top template, and the second limiting portion is arranged on the upper side template, so as to limit the upper side template when the upper side template extends to a preset length through the cooperation of the first limiting portion and the second limiting portion.

[0013] In this embodiment, the lower side support assembly includes a third telescopic driving member and a lower side help template. The third telescopic driving member is arranged on the walking assembly, and the lower side help template is arranged on the execution end of the third telescopic driving member. The third telescopic driving member can drive the lower side help template to extend or retract.

[0014] In this embodiment, the traveling assembly is a crawler-type traveling assembly.

[0015] The coal mine underground chamber masonry method of the embodiment of the present invention adopts the above-mentioned coal mine underground chamber masonry support device, and the coal mine underground chamber masonry method includes the following steps: moving the coal mine underground chamber masonry support device to a preset position in the tunnel; controlling the top support assembly, the upper side support assembly and the lower side support assembly to be in an extended state; pouring concrete between the support splicing plate formed by the top support assembly, the upper side support assembly and the lower side support assembly and the inner wall of the tunnel, and curing it to the designed strength; sequentially controlling the lower side support assembly, the upper side support assembly and the top support assembly to be in a retracted state to complete the support. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic structural diagram of a masonry support device for a coal mine underground chamber according to an embodiment of the present invention;

[0017] Figure 2 It is a flow chart of a coal mine underground chamber masonry method according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] 1. Travel assembly; 2. Top support assembly; 21. First telescopic drive member; 22. Top template; 3. Upper side support assembly; 31. Second telescopic drive member; 311. Driving gear; 312. Driven gear; 32. Upper side template; 4. Lower side support assembly; 41. Third telescopic drive member; 42. Lower side template. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] In the embodiments of the present application, Figure 1 As shown, the coal mine underground chamber masonry support device includes a walking assembly 1, a top support assembly 2, an upper side support assembly 3 and a lower side support assembly 4. The walking assembly 1 can walk along the chamber floor; the top support assembly 2 is arranged on the walking assembly 1; the upper side support assembly 3 is set as two groups, and the two groups of upper side support assemblies 3 are respectively arranged on both sides of the width direction of the top support assembly 2; the lower side support assembly 4 is set as two groups, and the two groups of lower side support assemblies 4 are respectively arranged on both sides of the width direction of the walking assembly 1, and are located one by one below the two groups of upper side support assemblies 3; the top support assembly 2, the upper side support assembly 3 and the lower side support assembly 4 all have an extended state and a retracted state. In the extended state, the top support assembly 2, the upper side support assembly 3 and the lower side support assembly 4 form a support splicing plate that matches the cross-sectional shape of the top and side of the chamber, so that masonry can be carried out through the support splicing plate.

[0022] Specifically, two groups of upper side plate support assemblies are symmetrically arranged on both sides of the top support assembly 2. Two groups of lower side support assemblies 4 are symmetrically arranged on both sides of the walking assembly 1.

[0023] By setting up the walking component 1, the overall movement can be facilitated. A top support component 2 and two groups of lower side support components 4 are set on the walking component 1, and a group of upper side support components 3 are set on both sides of the top support component. When the top support component 2, the upper side support component 3 and the lower side support component 4 are all in the extended state, the top support component 2, the upper side support component 3 and the lower side support component 4 form a supporting splicing plate that matches the cross-sectional shape of the top and side of the chamber. The supporting splicing plate can be used as a base for masonry operations. When the masonry operation is completed, the top support component 2, the upper side support component 3 and the lower side support component 4 can be controlled to be in a retracted state to complete the removal of the supporting splicing plate so as to carry out the next section of masonry operations. The top support component 2, the upper side support component 3 and the lower side support component 4 can all be reused, which can reduce costs and improve work efficiency.

[0024] In this embodiment, if Figure 1 As shown, the top support assembly 2 includes a first telescopic drive member 21 and a top template 22. The first telescopic drive member 21 is arranged on the walking assembly 1, and the top template 22 is arranged at the execution end of the first telescopic drive member 21. The first telescopic drive member 21 can drive the top template 22 to extend or retract.

[0025] For example, the first telescopic drive member 21 is a hydraulic cylinder. The cylinder body of the hydraulic cylinder is connected to the traveling assembly 1, and the cylinder rod of the hydraulic cylinder is connected to the top template 22. The top template 22 is extended or retracted by the extension and contraction of the hydraulic cylinder rod. A single or multiple first telescopic drive member 21 can be provided. For example, two or three first telescopic drive members 21 can be provided. Providing multiple first telescopic drive members 21 can provide support for different positions of the top template 22, thereby improving the stability of the support for the top template 22.

[0026] It should be noted that, by setting up the first telescopic driving member 21 and the top template 22, the top template 22 is used as a part of the supporting splicing plate, and the first telescopic driving member 21 is used to drive the top template 22 to extend and form support for the top template 22 to facilitate subsequent masonry operations. After the masonry is completed, the first telescopic driving member 21 is used to drive the top template 22 to retract to facilitate overall movement and prepare for subsequent masonry operations.

[0027] In this embodiment, if Figure 1 As shown, the upper side help support assembly 3 includes a second telescopic driving member 31 and an upper side help template 32. The second telescopic driving member 31 is arranged on the top template 22. The upper side help template 32 is arranged on the top template 22 and is movable relative to the top template 22. The upper side help template 32 is connected to the second telescopic driving member 31 to drive the upper side help template 32 to extend or retract through the second telescopic driving member 31.

[0028] It should be noted that, by setting up the second telescopic driving member 31 and the upper side helping template 32, the upper side helping template 32 is used as a part of the supporting splicing plate, and the second telescopic driving member 31 is used to drive the upper side helping template 32 to extend and form support for the upper side helping template 32, so that the upper side helping template 32 can be used for subsequent bricklaying. After the bricklaying is completed, the second telescopic driving member 31 is used to drive the upper side helping template 32 to be retracted to facilitate the overall movement and prepare for the subsequent bricklaying operation.

[0029] In this embodiment, if Figure 1 As shown, the second telescopic driving member 31 includes a rotary driving member (not shown in the figure) and a driving gear 311. The rotary driving member is arranged on the top template 22. The top template 22 has a cavity with openings at both ends. The driving gear 311 is rotatably connected in the cavity through a rotating shaft. The rotating shaft is connected to the output end of the rotary driving member. The upper side template 32 is at least partially located in the cavity. The upper side template 32 has driven teeth meshing with the driving gear 311.

[0030] For example, the rotary drive member may include a hydraulic motor. Of course, the rotary drive member may also be configured as other drive forms, which are not limited here.

[0031] Specifically, if Figure 1As shown, the second telescopic driving member 31 also includes a driven gear 312, which is rotatably arranged in the cavity through another rotating shaft, and the driven gear 312 is arranged in parallel with the driving gear 311. The driven gear 312 is engaged with the driven teeth of the upper side help template 32. When the upper side help template 32 moves, the driven gear 312 can rotate accordingly. By arranging the driven gear 312 and the driving gear 311 to cooperate, support can be formed at both ends of the upper side help template 32, which is conducive to the stable movement of the upper side help template 32.

[0032] It can be understood that when it is necessary to control the upper side template 32 to extend, the rotating shaft is driven to rotate by the rotary driving member, and the rotating shaft drives the driving gear 311 to rotate. Since the driving gear 311 is engaged with the driven teeth on the upper side template 32, the driving gear 311 can drive the upper side template 32 to move when it rotates until the upper side template 32 moves to the preset position; when it is necessary to control the upper side template 32 to retract, the rotating driving member is controlled to rotate in the opposite direction, and the rotating driving member drives the driving gear 311 to rotate in the opposite direction, thereby driving the upper side template 32 to rotate in the opposite direction.

[0033] In this embodiment, the inner wall of the cavity is provided with a guide groove (not shown in the figure), and the upper side help plate 32 has a guide protrusion (not shown in the figure) matched and connected to the guide groove.

[0034] Specifically, the guide protrusion can be provided on the side of the upper side help plate 32 away from the driven teeth. The guide protrusion matches the shape of the guide groove and can move along the guide groove.

[0035] It can be understood that by providing a guide groove on the inner wall of the cavity and providing a guide protrusion on the upper side help template 32, the upper side help template 32 is guided when moving through the cooperation of the guide protrusion and the guide groove, which is conducive to the stable extension or retraction of the upper side help template 32.

[0036] In this embodiment, the cross-sectional shape of the top template 22 is an arc shape, the cross-sectional shape of the upper side template 32 matches the cross-sectional shape of the top template 22, and the arc length of the upper side template 32 is less than or equal to 1 / 2 of the arc length of the top template 22.

[0037] For example, when the top template 22 and the two upper side templates 32 are in the extended state, the top template 22 and the two upper side templates 32 may be shaped like a semicircle.

[0038] It can be understood that setting the cross-sectional shape of the top template 22 to a circular arc shape and matching the cross-sectional shape of the upper side template 32 with the cross-sectional shape of the top template 22 can save space in the cavity and help reduce the overall volume of the top template 22. The arc length of the upper side template 32 is less than or equal to 1 / 2 of the arc length of the top template 22, so that by setting the length of the cavity, the upper side template 32 can be retracted into the cavity as much as possible when it is in the retracted state, thereby improving the compactness of the overall structure.

[0039] In this embodiment, the coal mine underground chamber masonry support device also includes a limiting member (not shown in the figure), which includes a first limiting portion and a second limiting portion. The first limiting portion is arranged on the top template 22, and the second limiting portion is arranged on the upper side template 32, so as to limit the upper side template 32 when the upper side template 32 extends to a preset length through the cooperation of the first limiting portion and the second limiting portion.

[0040] The first limiting portion and the second limiting portion can both be raised blocks. When the upper side helper plate 32 extends to a preset length, the first limiting portion and the second limiting portion abut against each other in the moving direction of the upper side helper plate 32, so that the upper side helper plate 32 is blocked and supported by the cooperation of the first limiting portion and the second limiting portion, thereby reducing the force acting on the driving gear 311.

[0041] In this embodiment, if Figure 1 As shown, the lower side support assembly 4 includes a third telescopic driving member 41 and a lower side plate 42. The third telescopic driving member 41 is arranged on the walking assembly 1, and the lower side plate 42 is arranged at the execution end of the third telescopic driving member 41. The third telescopic driving member 41 can drive the lower side plate 42 to extend or retract.

[0042] For example, the third telescopic driving component 41 is a hydraulic cylinder, the cylinder body of the hydraulic cylinder is connected to the walking component 1, and the cylinder rod of the hydraulic cylinder is connected to the lower side template 42. The lower side template 42 is in an extended state or a retracted state through the extension and retraction of the hydraulic cylinder rod.

[0043] It should be noted that, by setting up the third telescopic driving member 41 and the lower side template 42, the lower side template 42 is used as a part of the supporting splicing plate, and the third telescopic driving member 41 is used to drive the lower side template 42 to extend and support the lower side template 42 to facilitate subsequent masonry operations. After the masonry is completed, the third telescopic driving member 41 is used to drive the lower side template 42 to retract, so as to facilitate the overall movement and prepare for subsequent masonry operations.

[0044] In this embodiment, the traveling assembly 1 is a crawler-type traveling assembly.

[0045] The crawler-type walking assembly 1 is conventional in the prior art, and its specific structure and working principle are not described in detail here.

[0046] This embodiment adopts a crawler-type walking assembly driven by an explosion-proof diesel engine, does not require the laying of tracks or cables, is adaptable to humid and dusty environments, and has low movement resistance.

[0047] The coal mine underground chamber masonry method in this embodiment adopts the above-mentioned coal mine underground chamber masonry support device, such as Figure 2 As shown, the coal mine underground chamber masonry method includes the following steps:

[0048] S100, moving the underground coal mine chamber masonry support device to a preset position in the tunnel.

[0049] The preset position is the position to be built.

[0050] S200, controlling the top support assembly 2, the upper side support assembly 3 and the lower side support assembly 4 to be in an extended state.

[0051] S300, pouring concrete between the supporting splicing plate formed by the top support assembly 2, the upper side support assembly 3 and the lower side support assembly 4 and the inner wall of the tunnel, and curing to the design strength.

[0052] S400, sequentially controlling the lower side support assembly 4, the upper side support assembly 3 and the top support assembly 2 to be in a retracted state to complete the support.

[0053] The coal mine underground chamber masonry method in this embodiment adopts the coal mine underground chamber masonry support device. After the support device is moved to the preset position, the top support assembly 2, the upper side support assembly 3 and the lower side support assembly 4 are controlled to be in the extended state. The top support assembly 2, the upper side support assembly 3 and the lower side support assembly 4 form a support splicing plate that matches the cross-sectional shape of the top and side of the chamber. After pouring concrete between the support splicing plate and the inner wall of the tunnel and curing it to the designed strength, the top support assembly 2, the upper side support assembly 3 and the lower side support assembly 4 are controlled to be in the retracted state, and the removal of the support splicing plate can be completed to carry out the next section of masonry operation. The top support assembly 2, the upper side support assembly 3 and the lower side support assembly 4 can all be reused, which can reduce costs and improve work efficiency.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0056] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0058] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A coal mine underground chamber masonry support device, characterized in that: include: A walking assembly, wherein the walking assembly can move along the bottom plate of the chamber; A top support assembly, the top support assembly being arranged on the walking assembly; Upper side support assembly, the upper side support assembly is set as two groups, and the two groups of upper side support assemblies are respectively arranged on both sides of the width direction of the top support assembly; Lower side support components, the lower side support components are set as two groups, the two groups of lower side support components are respectively arranged on both sides of the width direction of the walking component, and are located one-to-one below the two groups of upper side support components; The top support assembly, the upper side support assembly and the lower side support assembly all have an extended state and a retracted state. In the extended state, the top support assembly, the upper side support assembly and the lower side support assembly form a supporting splicing plate that matches the cross-sectional shape of the top and side of the chamber, so that masonry can be carried out through the supporting splicing plate.

2. The coal mine underground chamber masonry support device according to claim 1, characterized in that: The top support assembly includes a first telescopic drive member and a top template. The first telescopic drive member is arranged on the walking assembly, and the top template is arranged on the execution end of the first telescopic drive member. The first telescopic drive member can drive the top template to extend or retract.

3. The coal mine underground chamber masonry support device according to claim 2, characterized in that: The upper side help support assembly includes a second telescopic driving member and an upper side help template. The second telescopic driving member is arranged on the top template. The upper side help template is arranged on the top template and is movable relative to the top template. The upper side help template is connected to the second telescopic driving member to drive the upper side help template to extend or retract through the second telescopic driving member.

4. The coal mine underground chamber masonry support device according to claim 3, characterized in that: The second telescopic driving member includes a rotary driving member and a driving gear. The rotary driving member is arranged on the top template. The top template has a cavity with openings at both ends. The driving gear is rotatably connected in the cavity via a rotating shaft. The rotating shaft is connected to the output end of the rotary driving member. The upper side template is at least partially located in the cavity. The upper side template has driven teeth that mesh with the driving gear.

5. The coal mine underground chamber masonry support device according to claim 4, characterized in that: The inner wall of the cavity is provided with a guide groove, and the upper side help plate has a guide protrusion matched and connected with the guide groove.

6. The coal mine underground chamber masonry support device according to claim 3, characterized in that: The cross-sectional shape of the top template is arc-shaped, the cross-sectional shape of the upper side template matches the cross-sectional shape of the top template, and the arc length of the upper side template is less than or equal to 1 / 2 of the arc length of the top template.

7. The coal mine underground chamber masonry support device according to claim 3, characterized in that: It also includes a limiting member, which includes a first limiting portion and a second limiting portion. The first limiting portion is arranged on the top template, and the second limiting portion is arranged on the upper side template, so that the upper side template can be limited when the upper side template extends to a preset length through the cooperation of the first limiting portion and the second limiting portion.

8. The coal mine underground chamber masonry support device according to claim 1, characterized in that: The lower side support assembly includes a third telescopic driving member and a lower side template. The third telescopic driving member is arranged on the walking assembly, and the lower side template is arranged on the execution end of the third telescopic driving member. The third telescopic driving member can drive the lower side template to extend or retract.

9. The coal mine underground chamber masonry support device according to claim 1, characterized in that: The walking assembly is a crawler-type walking assembly.

10. A method for laying bricks in a coal mine underground chamber, characterized in that: Using the coal mine underground chamber masonry support device according to any one of claims 1 to 9, the coal mine underground chamber masonry method includes the following steps: Move the underground coal mine chamber masonry support device to the preset position in the tunnel; Controlling the top support assembly, the upper side support assembly and the lower side support assembly to be in an extended state; pouring concrete between the support splicing plate formed by the top support assembly, the upper side support assembly and the lower side support assembly and the inner wall of the roadway, and curing the concrete to the designed strength; The lower side support assembly, the upper side support assembly and the top support assembly are controlled in sequence to be in a retracted state to complete the support.

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