Portable reinforcing device and method for deep foundation pit support pile

Abstract

The invention relates to the technical field of well lids, and discloses a convenient reinforcing device and method for a deep foundation pit supporting pile, the convenient reinforcing device comprises two vertical plates and supporting plates, the two vertical plates are symmetrically arranged from left to right, the two supporting plates are arranged between the two vertical plates, grooves are formed in the sides, close to each other, of the two vertical plates, and the supporting plates are arranged in the grooves. First connecting blocks are fixedly arranged on the sides, close to each other, of the upper ends of the two vertical plates, the upper ends of the supporting plates are rotationally connected with the corresponding first connecting blocks through first rotating rods, a transverse plate is arranged between the lower sides of the two supporting plates, and second rotating rods are rotationally arranged at the two ends of the transverse plate; and the lower ends of the two supporting plates are fixedly connected with a second rotating rod in a sleeving manner. According to the convenient reinforcing device and method for the deep foundation pit supporting pile, rapid unfolding and folding can be achieved, foundation pits with different widths can be supported when the device is unfolded, and the device is small in occupied area and convenient to carry when the device is folded.

Description

Technical Field

[0001] The invention relates to the technical field of manhole covers, and in particular to a convenient reinforcement device and method for deep foundation pit support piles. Background Art

[0002] In modern construction projects, deep foundation pit construction is a key link, and the stability of its supporting piles is crucial to the safety of the entire project. However, the commonly used supporting pile reinforcement devices have many shortcomings. Traditional reinforcement methods often require a lot of on-site assembly work, which takes a long time and seriously affects the construction progress. Moreover, these devices are usually designed for foundation pits of specific sizes and have poor adaptability to foundation pits of different widths. In actual construction, it is necessary to prepare equipment of various specifications, which increases construction costs and management difficulties. In addition, the existing reinforcement devices are also inconvenient in storage and carrying. Their large size occupies more construction site space, which is not conducive to the rational planning of the site and the rapid transfer of equipment. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the shortcomings of the prior art, the present invention provides a convenient reinforcement device and method for deep foundation pit support piles, which have the advantages of being able to be quickly unfolded and folded, being able to support foundation pits of different widths when unfolded, and occupying less space when folded and being easy to carry, thereby solving the problems raised in the background technology.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a convenient reinforcement device and method for deep foundation pit support piles, comprising a vertical plate and a support plate, the two vertical plates are symmetrically arranged from left to right, the two support plates are arranged between the two vertical plates, a groove is provided on the side close to the two vertical plates, a first connecting block is fixedly arranged on the side close to the upper ends of the two vertical plates, the upper ends of the support plates are rotatably connected to the corresponding first connecting block through a first rotating rod, a horizontal plate is arranged between the lower sides of the two support plates, a second rotating rod is rotatably arranged at both ends of the horizontal plate, and the lower ends of the two support plates are fixedly sleeved with the second rotating rod. The front side of the horizontal plate is provided with a limiting mechanism for limiting the rotation of the two second rotating rods, a supporting mechanism for supporting the supporting plate is provided between the opposite sides of the two support plates and the corresponding vertical plates, a sliding groove is provided on the opposite sides of the two vertical plates, a height adjustment plate is slidingly provided inside the sliding groove, an adjusting mechanism for driving the height adjustment plate to move is provided on the top of the vertical plate, a first cavity is provided at the lower end of the vertical plate, a through hole is provided on the lower side of the first cavity, a slide plate is provided inside the first cavity, a walking wheel is fixedly provided on the lower side of the slide plate, and a transmission mechanism for driving the slide plate to move is provided on the upper side of the first cavity.

[0007] Preferably, the limiting mechanism includes a limiting ring and an insert rod, the two limiting rings are fixedly sleeved on one end of the corresponding second rotating rod, two fixed plates are fixedly arranged on the front side of the horizontal plate, a bidirectional screw rod is rotatably arranged between the two fixed plates, both ends of the bidirectional screw rod are threadedly sleeved with movable plates, the insert rod is fixedly arranged on a side of the movable plate close to the limiting ring, a plurality of sockets are opened on the side wall of the limiting ring, and one end of the insert rod is plugged into the corresponding socket.

[0008] The cam is an adjustable airbag and a support arm is provided with a second adjusting block, the second adjusting block being provided with a second end of a support arm and a support arm being provided with a second end of a support arm.

[0009] Preferably, the adjustment mechanism includes a gear and a rack, a transmission groove is opened on the side of the height adjustment plate close to the vertical plate, the rack is fixedly arranged on one inner wall of the transmission groove, a side plate is fixedly arranged on the top of the vertical plate, a transmission rod is rotatably arranged on one side of the side plate, one end of the transmission rod extends to the inner side of the transmission groove, the gear is meshingly arranged on one side of the rack, the gear is fixedly sleeved with one end of the transmission rod, a motor is fixedly arranged on the end of the side plate away from the transmission rod, and the output end of the motor is fixedly connected to one end of the transmission rod.

[0010] Preferably, the transmission mechanism includes an internal threaded tube and a threaded rod, the internal threaded tube is rotatably arranged on the top inner wall of the first cavity, the threaded rod is threadedly sleeved inside the internal threaded tube, the lower end of the threaded rod is fixedly connected to the slide plate, the outer wall of the internal threaded tube is fixedly sleeved with a first bevel gear, a cross bar is rotatably arranged on one side of the cavity, the inner end of the cross bar is fixedly sleeved with a second bevel gear, and the first bevel gear is meshingly connected with the second bevel gear.

[0011] Preferably, both inner walls of the sliding groove are provided with strip grooves, and a limit block is slidably provided inside the strip groove, and one side of the limit block is fixedly connected to the height adjustment plate.

[0012] Preferably, the cross-sections of the slide plate and the first cavity are both rectangular.

[0013] Preferably, a sliding rod is fixedly arranged between one side of the two fixed plates, and one end of the two movable plates is movably sleeved with the rod wall of the sliding rod.

[0014] Preferably, a rotating wheel is fixedly sleeved on one outer end of the cross bar.

[0015] A convenient reinforcement method for deep foundation pit support piles, comprising a convenient reinforcement device for deep foundation pit support piles, and the specific steps are:

[0016] Step 1: Move the device into place. The walking wheels provided at the bottom of the two vertical plates can be used to move the device in a time-saving and labor-saving manner, that is, the device can be quickly moved into place;

[0017] Step 2: Adjust the height of the device. Turn on the power of the motor, and the motor drives the transmission rod to rotate, so that the gear rotates, and the gear drives the rack to move, so that the height adjustment plate moves relative to the vertical plate, and the overall height of the device can be adjusted.

[0018] Step 3: unfold the device and rotate the bidirectional screw rod so that the two movable plates drive the corresponding plug rods to move, so that the plug rods leave the insertion holes, that is, release the limit of the limit ring, and then release the limit of the second rotating rod, so that the two support plates can be rotated toward the horizontal, that is, the two vertical plates can be moved back to back, so that it is convenient to support foundation pits of different widths;

[0019] Step 4, put away the traveling wheel and rotate the cross bar so that the second bevel gear drives the first bevel gear to rotate, that is, the internal threaded tube rotates, the internal threaded tube drives the threaded rod to move, that is, the slide plate moves, and the slide plate drives the corresponding traveling wheel to move, that is, the traveling wheel can be put into the first cavity, that is, the stability of the device can be maintained.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides a convenient reinforcement device and method for deep foundation pit support piles, which has the following beneficial effects:

[0022] 1. The convenient reinforcement device and method for deep foundation pit support piles can save time and effort by moving the device through the walking wheels arranged at the bottom of the two vertical plates, that is, the device can be quickly moved into place.

[0023] 2. The convenient reinforcement device and method for deep foundation pit support piles drives the transmission rod to rotate by a motor, so that the gear rotates, and the gear drives the rack to move, so that the height adjustment plate moves relative to the vertical plate, and the overall height of the device can be adjusted.

[0024] 3. The convenient reinforcement device and method for deep foundation pit support piles rotates the bidirectional screw so that the two movable plates drive the corresponding insertion rods to move, so that the insertion rods leave the insertion holes, thereby releasing the limit on the limit ring, and then releasing the limit on the second rotating rod, so that the two support plates can be rotated toward the horizontal direction, and the two vertical plates can be moved back to back, so that it is convenient to support foundation pits of different widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a convenient reinforcement device and method for deep foundation pit support piles proposed by the present invention;

[0026] Figure 2 for Figure 1 A magnified view of the structure of part A;

[0027] Figure 3 for Figure 1 A magnified view of the structure of part B;

[0028] Figure 4 for Figure 1 A magnified view of the structure of part C;

[0029] Figure 5 for Figure 1 A perspective view of the mid-height adjustment plate.

[0030] In the figure: 1, vertical plate; 2, first connecting block; 3, first rotating rod; 4, supporting plate; 5, height adjustment plate; 6, limiting block; 7, triangular block; 8, side plate; 9, rack; 10, gear; 11, transmission rod; 12, internal threaded pipe; 13, threaded rod; 14, first bevel gear; 15, second bevel gear; 16, cross bar; 17, slide plate; 18, walking wheel; 19, limiting ring; 20, two-way screw rod; 21, second rotating rod; 22, movable plate; 23, plug rod; 24, cross bar; 25, supporting rod; 26, mounting block; 27, clamping block; 28, spring; 29, stopper; 30, adjusting rod. DETAILED DESCRIPTION

[0031] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] See also Figure 1-5 A convenient reinforcement device and method for deep foundation pit support piles, comprising a vertical plate 1 and a support plate 4, the two vertical plates 1 are symmetrically arranged from left to right, the two support plates 4 are arranged between the two vertical plates 1, the sides close to each other of the two vertical plates 1 are provided with grooves, the sides close to the upper ends of the two vertical plates 1 are fixedly provided with a first connecting block 2, the upper ends of the support plates 4 are rotatably connected to the corresponding first connecting block 2 through a first rotating rod 3, a horizontal plate is arranged between the lower sides of the two support plates 4, the two ends of the horizontal plate are rotatably provided with a second rotating rod 21, the sides of the two vertical plates 1 that are away from each other are provided with a slide groove, and the inner part of the slide groove A height adjustment plate 5 is slidably provided on the upper part, and strip grooves are provided on the inner walls of both sides of the slide groove. A limit block 6 is slidably provided on the inner side of the strip groove. One side of the limit block 6 is fixedly connected to the height adjustment plate 5, so that the height adjustment plate 5 can move stably. An adjusting mechanism for driving the height adjustment plate 5 to move is provided on the top of the vertical plate 1. A first cavity is provided at the lower end of the vertical plate 1, and a through hole is provided on the lower side of the first cavity. A slide plate 17 is provided inside the first cavity, and a walking wheel 18 is fixedly provided on the lower side of the slide plate 17. The cross-sections of the slide plate 17 and the first cavity are both rectangular, so that the slide plate 17 can slide stably.

[0034] Embodiment 2

[0035] See also Figure 1-5The lower ends of the two support plates 4 are fixedly sleeved with the second rotating rod 21, and a limiting mechanism for limiting the rotation of the two second rotating rods 21 is provided on the front side of the horizontal plate. The limiting mechanism includes a limiting ring 19 and an insert rod 23. The two limiting rings 19 are fixedly sleeved on one end of the corresponding second rotating rod 21. Two fixed plates are fixedly provided on the front side of the horizontal plate, and a bidirectional screw rod 20 is rotatably provided between the two fixed plates. Both ends of the bidirectional screw rod 20 are threadedly sleeved with a movable plate 22, and the insert rod 23 is fixedly provided on a side of the movable plate 22 close to the limiting ring 19. A plurality of insertion holes are provided on the side wall of the limiting ring 19, and one end of the insert rod 23 is inserted into the corresponding insertion hole. A sliding rod 24 is fixedly provided between one side of the two fixed plates, and one end of the two movable plates 22 are movably sleeved with the rod wall of the sliding rod 24, so that the movable plate 22 can slide stably.

[0036] Embodiment 3

[0037] See also Figure 1-5 A support mechanism for supporting the support plate 4 is arranged between the side of the two support plates 4 that are away from each other and the corresponding vertical plate 1. The support mechanism includes a support rod 25 and an adjusting rod 30. A second connecting block is fixedly arranged on the side of the support plate 4 close to the corresponding vertical plate 1. The support rod 25 is rotatably arranged on one side of the second connecting block through the second support rod 25. The interior of the support rod 25 is a hollow structure. A stopper 29 is slidably arranged inside the support rod 25. The adjusting rod 30 is fixedly arranged on one side of the stopper 29. One end of the adjusting rod 30 extends to the support plate 4. On the outer side of the support rod 25, a plurality of triangular blocks 7 are fixedly arranged on the inner side of the lower end of the groove, one end of the adjusting rod 30 contacts the corresponding triangular block 7, a second cavity is opened in the middle of the stopper 29, a mounting block 26 is slidably arranged inside the second cavity, a clamping block 27 is fixedly arranged on one side of the mounting block 26, a plurality of clamping grooves are opened on one side of the second cavity, one end of the clamping block 27 is clamped with the corresponding clamping groove, a spring 28 is fixedly arranged on the side of the mounting block 26 away from the clamping block 27, and the other end of the spring 28 is fixedly connected to the inner wall of the second cavity.

[0038] Embodiment 4

[0039] See also Figure 1-5 The adjustment mechanism includes a gear 10 and a rack 9. A transmission groove is opened on the side of the height adjustment plate 5 close to the vertical plate 1. The rack 9 is fixedly arranged on the inner wall of one side of the transmission groove. A side plate 8 is fixedly arranged on the top of the vertical plate 1. A transmission rod 11 is rotatably arranged on one side of the side plate 8. One end of the transmission rod 11 extends to the inner side of the transmission groove. The gear 10 is meshed and arranged on one side of the rack 9. The gear 10 is fixedly sleeved with one end of the transmission rod 11. A motor is fixedly arranged on the end of the side plate 8 away from the transmission rod 11, and the output end of the motor is fixedly connected to one end of the transmission rod 11.

[0040] Embodiment 5

[0041] See also Figure 1-5 A transmission mechanism for driving the slide plate 17 to move is arranged on the upper inner side of the first cavity, and the transmission mechanism includes an internal threaded tube 12 and a threaded rod 13. The internal threaded tube 12 is rotatably arranged on the inner wall of the top end of the first cavity, and the threaded rod 13 is threadedly sleeved inside the internal threaded tube 12. The lower end of the threaded rod 13 is fixedly connected to the slide plate 17, and a first bevel gear 14 is fixedly sleeved on the outer wall of the internal threaded tube 12. A cross bar 16 is rotatably arranged on one side of the cavity, and a second bevel gear 15 is fixedly sleeved on one end of the inner side of the cross bar 16. The first bevel gear 14 is meshedly connected with the second bevel gear 15, and a rotating wheel is fixedly sleeved on one end of the outer side of the cross bar 16 to facilitate the rotation of the cross bar 16.

[0042] A convenient reinforcement method for deep foundation pit support piles, the specific steps of which are:

[0043] Step 1: Move the device to the position. The walking wheels 18 provided at the bottom of the two vertical plates 1 can be used to move the device in a time-saving and labor-saving manner, that is, the device can be quickly moved to the position;

[0044] Step 2: Adjust the height of the device. Turn on the power of the motor, and the motor drives the transmission rod 11 to rotate, so that the gear 10 rotates, and the gear 10 drives the rack 9 to move, so that the height adjustment plate 5 moves relative to the vertical plate 1, and the overall height of the device can be adjusted.

[0045] Step 3: unfold the device, rotate the bidirectional screw 20, so that the two movable plates 22 drive the corresponding plug rods 23 to move, so that the plug rods 23 leave the insertion holes, that is, release the limit of the limit ring 19, and then release the limit of the second rotating rod 21, that is, the two support plates 4 can be rotated toward the horizontal, that is, the two vertical plates 1 can be moved back to back, that is, it is convenient to support foundation pits of different widths;

[0046] Step 4, put away the running wheel 18, rotate the cross bar 16, so that the second bevel gear 15 drives the first bevel gear 14 to rotate, that is, the internal threaded tube 12 rotates, the internal threaded tube 12 drives the threaded rod 13 to move, that is, the slide plate 17 moves, and the slide plate 17 drives the corresponding running wheel 18 to move, that is, the running wheel 18 can be put into the first cavity, that is, the stability of the device can be maintained.

[0047] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A convenient reinforcement device for deep foundation pit support piles, comprising a vertical plate (1) and a support plate (4), characterized in that: The two vertical plates (1) are symmetrically arranged from left to right, the two support plates (4) are arranged between the two vertical plates (1), the sides of the two vertical plates (1) close to each other are provided with grooves, the sides of the upper ends of the two vertical plates (1) close to each other are fixedly provided with first connecting blocks (2), the upper ends of the support plates (4) are rotatably connected to the corresponding first connecting blocks (2) through first rotating rods (3), a horizontal plate is arranged between the lower sides of the two support plates (4), the two ends of the horizontal plate are rotatably provided with second rotating rods (21), the lower ends of the two support plates (4) are fixedly sleeved with the second rotating rods (21), and the front side of the horizontal plate is provided with limiting rods for limiting the rotation of the two second rotating rods (21). A positioning mechanism is provided, a supporting mechanism for supporting the supporting plate (4) is arranged between the opposite sides of the two supporting plates (4) and the corresponding vertical plates (1), a slide groove is provided on the opposite sides of the two vertical plates (1), a height adjustment plate (5) is slidably provided inside the slide groove, an adjustment mechanism for driving the height adjustment plate (5) to move is provided on the top of the vertical plate (1), a first cavity is provided at the lower end of the vertical plate (1), a through hole is provided on the lower side of the first cavity, a slide plate (17) is provided inside the first cavity, a walking wheel (18) is fixedly provided on the lower side of the slide plate (17), and a transmission mechanism for driving the slide plate (17) to move is provided on the upper side of the first cavity.

2. A portable reinforcement device for deep foundation pit support piles according to claim 1, characterized in that: The limiting mechanism comprises a limiting ring (19) and an insert rod (23), the two limiting rings (19) are fixedly sleeved on one end of the corresponding second rotating rod (21), two fixed plates are fixedly arranged on the front side of the horizontal plate, a bidirectional screw rod (20) is rotatably arranged between the two fixed plates, both ends of the bidirectional screw rod (20) are threadedly sleeved with a movable plate (22), the insert rod (23) is fixedly arranged on a side of the movable plate (22) close to the limiting ring (19), a plurality of insertion holes are opened on the side wall of the limiting ring (19), and one end of the insert rod (23) is inserted into the corresponding insertion hole.

3. A portable reinforcement device for deep foundation pit support piles according to claim 1, characterized in that: The support mechanism comprises a support rod (25) and an adjustment rod (30); a second connection block is fixedly arranged on one side of the support plate (4) close to the corresponding vertical plate (1); the support rod (25) is rotatably arranged on one side of the second connection block through the second support rod (25); the interior of the support rod (25) is a hollow structure; a stopper (29) is slidably arranged on the interior of the support rod (25); the adjustment rod (30) is fixedly arranged on one side of the stopper (29); one end of the adjustment rod (30) extends to the outside of the support rod (25); and a stopper (29) is fixedly arranged on the inner side of the lower end of the groove. There are a plurality of triangular blocks (7), one end of the adjusting rod (30) contacts the corresponding triangular block (7), a second cavity is provided in the middle of the stopper (29), a mounting block (26) is slidably provided inside the second cavity, a clamping block (27) is fixedly provided on one side of the mounting block (26), a plurality of clamping grooves are provided on one side of the second cavity, one end of the clamping block (27) is clamped with the corresponding clamping groove, a spring (28) is fixedly provided on the side of the mounting block (26) away from the clamping block (27), and the other end of the spring (28) is fixedly connected to the inner wall of the second cavity.

4. A portable reinforcement device for deep foundation pit support piles according to claim 1, characterized in that: The adjustment mechanism comprises a gear (10) and a rack (9); a transmission groove is provided on a side of the height adjustment plate (5) close to the vertical plate (1); the rack (9) is fixedly arranged on an inner wall of one side of the transmission groove; a side plate (8) is fixedly arranged on the top of the vertical plate (1); a transmission rod (11) is rotatably arranged on one side of the side plate (8); one end of the transmission rod (11) extends to the inner side of the transmission groove; the gear (10) is meshedly arranged on one side of the rack (9); the gear (10) is fixedly sleeved with one end of the transmission rod (11); a motor is fixedly arranged on one end of the side plate (8) away from the transmission rod (11); and the output end of the motor is fixedly connected to one end of the transmission rod (11).

5. A portable reinforcement device for deep foundation pit support piles according to claim 1, characterized in that: The transmission mechanism comprises an internally threaded tube (12) and a threaded rod (13); the internally threaded tube (12) is rotatably arranged on the top inner wall of the first cavity; the threaded rod (13) is threadedly sleeved inside the internally threaded tube (12); the lower end of the threaded rod (13) is fixedly connected to a slide plate (17); a first bevel gear (14) is fixedly sleeved on the outer wall of the internally threaded tube (12); a cross bar (16) is rotatably arranged on one side of the cavity; a second bevel gear (15) is fixedly sleeved on one inner end of the cross bar (16); and the first bevel gear (14) is meshingly connected with the second bevel gear (15).

6. A portable reinforcement device for deep foundation pit support piles according to claim 1, characterized in that: The inner walls on both sides of the slide groove are provided with strip grooves, and a limit block (6) is slidably arranged inside the strip groove, and one side of the limit block (6) is fixedly connected to the height adjustment plate (5).

7. A portable reinforcement device for deep foundation pit support piles according to claim 1, characterized in that: The cross sections of the slide plate (17) and the first cavity are both rectangular.

8. A portable reinforcement device for deep foundation pit support piles according to claim 2, characterized in that: A sliding rod (24) is fixedly arranged between one side of the two fixed plates, and one end of the two movable plates (22) is movably sleeved with the rod wall of the sliding rod (24).

9. A portable reinforcement device for deep foundation pit support piles according to claim 5, characterized in that: A rotating wheel is fixedly sleeved on one outer end of the cross bar (16).

10. A convenient reinforcement method for deep foundation pit support piles, comprising the convenient reinforcement device for deep foundation pit support piles according to any one of claims 1 to 9, wherein the specific steps are as follows: Step 1: Move the device to a position. The walking wheels (18) provided at the bottom of the two vertical plates (1) can be used to move the device in a time-saving and labor-saving manner, that is, the device can be quickly moved to a position; Step 2: Adjust the height of the device. Turn on the power of the motor, and the motor drives the transmission rod (11) to rotate, so that the gear (10) rotates, and the gear (10) drives the rack (9) to move, so that the height adjustment plate (5) moves relative to the vertical plate (1), so that the overall height of the device can be adjusted; Step 3: unfold the device, rotate the bidirectional screw rod (20), so that the two movable plates (22) drive the corresponding insertion rod (23) to move, so that the insertion rod (23) leaves the insertion hole, that is, releases the limit of the limit ring (19), and then releases the limit of the second rotating rod (21), so that the two support plates (4) can be rotated toward the horizontal, that is, the two vertical plates (1) can be moved back to back, so that it is convenient to support foundation pits of different widths; Step 4: Retract the running wheel (18), rotate the cross bar (16), so that the second bevel gear (15) drives the first bevel gear (14) to rotate, that is, the internally threaded tube (12) rotates, the internally threaded tube (12) drives the threaded rod (13) to move, that is, the slide plate (17) moves, and the slide plate (17) drives the corresponding running wheel (18) to move, that is, the running wheel (18) can be retracted into the first cavity, that is, the stability of the device can be maintained.

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