Multifunctional anti-falling bed

Abstract

The invention discloses a multifunctional anti-falling bed, which belongs to the technical field of medical sickbeds and specifically comprises a bed body, handrails are mounted on two sides of the bed body through mounting boxes, mounting grooves for mounting the handrails are formed in the mounting boxes, and a first restraint strap for restraining the head of a patient is further arranged on the bed body. First sliding blocks are arranged at the two ends of the first restraint strap, one end of each second restraint strap is fixed, the other end of each second restraint strap is connected with a fourth sliding block through a movable rod, an air pump is installed at the bottom of the bed body, the output end of the air pump is connected with a sealing box, and a piston is arranged in the sealing box in a sliding mode. An air inlet pipe and an exhaust pipe are arranged between the mounting groove and the sealing box in a communicating mode, and linkage assemblies are arranged between the piston and the first sliding block and between the piston and the fourth sliding block. According to the medical nursing bed, inflation is conducted through the air pump, lifting of the two handrails and restraining of the head and the arms can be driven at the same time, operation is extremely convenient, and when a patient does not need to be restrained, the bed body can be used as a common sickbed.

Description

Technical Field

[0001] The invention relates to the technical field of medical beds, and in particular to a multifunctional anti-fall bed. Background Art

[0002] As the trend of population aging intensifies, the proportion of the elderly population continues to rise, and the health problems of the elderly are increasingly concerned. Among them, the elderly who are bedridden or have difficulty in moving are at a higher risk of falling out of bed in their daily lives, which may not only cause physical injuries but also affect their quality of life. Therefore, it is of great practical significance to develop a multifunctional bed that can effectively prevent falling out of bed.

[0003] However, traditional nursing beds have a single function, often only having basic sleeping and supporting functions, and cannot meet the diverse needs of modern medical and rehabilitation care. Especially for patients with mental symptoms such as irritability and delirium, traditional restraints are needed to restrain the patients, and during the restraint process, the side support bed baffles need to be opened, and the operation is often unchanged.

[0004] The invention patent with publication number CN 111631875 B discloses a fall-proof bed for children. By setting multiple connecting rods between the mounting rod and the limiting rod, and then setting a curtain between the two connecting rods to block the gap, children can be prevented from falling from the gap. However, similar fall-proof beds usually only serve as fall-proof beds, and cannot restrain patients while preventing them from falling. The utility model patent with publication number CN 220676204 U discloses an anti-fall and anti-fall restraint belt, which can bind the patient's chest, shoulders, arms and legs through a chest fixing ring, a shoulder connecting belt and a strap. However, similar restraint belts generally require each restraint belt to be fixed and loosened separately, and due to the obstruction of the railings on both sides of the bed, there are certain inconveniences in operation. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention aims to provide a multifunctional anti-fall bed, which can simultaneously drive the lifting of the railings on both sides of the bed and the restraint of the head and arms by inflating with an air pump. The operation is extremely convenient, and when there is no need to restrain the patient, the bed can be used as an ordinary bed, thereby minimizing the waste of medical resources.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A multifunctional anti-fall bed comprises a bed body, railings are movably provided on both sides of the bed body, a first restraint belt for restraining a patient's head and two second restraint belts for restraining the patient's arms are also provided on the bed body, and a control component for adjusting the railings, the first restraint belt and the second restraint belt is installed at the bottom of the bed body.

[0007] Furthermore, installation boxes are provided on both sides of the bed body, and installation grooves for installing the railings are provided in the installation boxes, and the installation grooves are connected to the control assembly.

[0008] Furthermore, the two ends of the first restraint belt are interlaced with each other, and both ends of the first restraint belt are provided with first support columns, the first support columns penetrate the bed body, and the bottom of each first support column is provided with a first slider, and the first slider is connected to the control component.

[0009] Furthermore, the two ends of the second restraint belt are also interlaced with each other, and the fixed end of the second restraint belt is slidably connected to the top surface of the bed, and the free end of the second restraint belt is connected to the movable rod after bypassing the railing and the edge of the bed, and the movable rod is slidably connected to the bottom of the bed, and the movable rod is connected to the control component.

[0010] Furthermore, one end of the movable rod is connected to a second support column, and the other end is provided with a third slider. The bottom of the second support column is connected to a fourth slider, the fourth slider is connected to the control component, and the third slider is slidably connected to the bottom of the bed.

[0011] Furthermore, the control component includes an air pump installed at the bottom of the bed, the output end of the air pump is connected to a sealing box, a piston is slidably provided inside the sealing box, an air inlet pipe and an exhaust pipe are connected between the installation groove and the sealing box, and a linkage component is provided between the piston and the first slider and the fourth slider.

[0012] Furthermore, the linkage assembly includes a piston push rod connected to the piston, the piston push rod is sealed and slides through the sealing box, the end of the piston push rod away from the piston is fixedly connected to a connecting plate, and the first slider and the fourth slider are both slidably connected to the connecting plate.

[0013] Furthermore, the connecting plate includes a middle section connected to the piston push rod, and triangular connecting plates symmetrically arranged on both sides of the middle section, the top angles of the triangular connecting plates are facing the head of the bed, and a limiting rod is provided at the top angle of each triangular connecting plate, and two limiting blocks matching the limiting rods are provided at the bottom of the bed.

[0014] Furthermore, a first limiting rail matching the first support column is installed at the bottom of the bed along the short axis direction, and first slide rails are provided on the side walls of the two triangular connecting plates close to each other, and the two first sliding blocks are slidably set in the corresponding first slide rails.

[0015] Furthermore, two second limiting rails matching the second supporting column are symmetrically arranged on both sides of the first limiting rail, and second slide rails are arranged on the side walls of the two triangular connecting plates away from each other, and the fourth sliding block is slidably arranged in the corresponding second slide rails.

[0016] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention has the following improvements: 1. The multifunctional anti-fall bed of the present invention can tighten the first and second restraint belts while the railings on both sides are raised, thereby preventing the patient from falling out of bed and restraining and fixing the patient's head and arms. The double anti-fall bed design can greatly reduce the risk of injury to the patient due to accidental falling out of bed, and significantly improve the patient's safety level. When the railings on both sides are lowered, the first and second restraint belts can also be loosened synchronously to release the restraint on the patient, and the bed body becomes a normal bed mode, thereby improving the utilization efficiency of medical resources.

[0017] 2. The multifunctional anti-fall bed of the present invention adopts an air pump inflation mode to raise and lower the railings on both sides. When the air pump is inflated, the railings on both sides rise and drive the connecting plate to move at the same time. The sliders connected to the first restraint belt and the second restraint belt slide with the movement of the connecting plate, thereby tightening the first restraint belt and the second restraint belt. The one-button operation reduces unnecessary operations and time waste, improves nursing efficiency, and reduces the workload of nursing staff.

[0018] 3. A piston is provided in the sealing box of the present invention, and the piston divides the internal space of the sealing box into a first air chamber for inflation and a second air chamber for exhaust. An exhaust valve for quantitative exhaust is provided on the second air chamber. Combined with the principle of air pressure difference, when inflating, the piston will move toward the second air chamber, and when exhausting, since the pressure in the second air chamber is greater than the pressure in the first air chamber, the piston will automatically reset. During the movement of the piston, the connecting plate is driven to move by the piston push rod, which simplifies the structure of the entire control component, reduces the structural cost, and makes the structure more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the multifunctional anti-fall bed in Example 1 of the present invention.

[0020] Figure 2 This is a schematic diagram of the bed structure in Example 1 of the present invention.

[0021] Figure 3 This is a schematic diagram of the railing structure in Example 1 of the present invention.

[0022] Figure 4 It is a schematic diagram of the bottom structure of the multifunctional anti-fall bed in Example 1 of the present invention.

[0023] Figure 5 For the present invention Figure 4 A partial enlarged view of the structure of part A.

[0024] Figure 6 Schematic diagram of the structure of the first restraining belt and the second restraining belt in Embodiment 1 of the present invention.

[0025] Figure 7 It is a cross-sectional view of the internal structure of the multifunctional anti-fall bed in the second embodiment of the present invention.

[0026] Figure 8 For the present invention Figure 7 A partial enlarged view of the structure of part B.

[0027] Fig. 9 This is a schematic diagram of the control component structure in Embodiment 2 of the present invention.

[0028] Fig.10 This is a schematic diagram of the connecting plate structure in the second embodiment of the present invention.

[0029] Fig.11 For the present invention Fig. 9 A partial enlarged view of the structure of part C in the middle.

[0030] Fig.12 For the present invention Fig. 9 A partial enlarged view of the structure of part D in the middle.

[0031] Fig.13 It is a schematic diagram of the structure of the linkage assembly in the second embodiment of the present invention.

[0032] Wherein: 1-bed, 101-first sliding through hole, 102-second sliding groove, 2-rail, 201-top rod, 202-baffle, 203-baffle rod, 3-first constraint belt, 4-second constraint belt, 5-installation box, 501-installation groove, 6-first support column, 7-first slider, 8-second slider, 9-movable rod, 10-second support column, 11-third slider, 12-air pump, 13-sealing box, 14-piston, 15-first air cavity, 16-second air cavity, 17-intake pipe, 18-exhaust pipe, 19-exhaust valve, 20-piston push rod, 21-connecting plate, 2101-middle section, 2102-triangular connecting plate, 2103-limiting rod, 22-limiting block, 23-first limiting rail, 24-first slide rail, 25-second limiting rail, 26-fourth slide rail, 27-second slide rail. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Embodiment 1: See attached Figure 1 -& shows a multifunctional anti-fall bed, comprising a bed body 1, both sides of which are movably provided with railings 2, the bed body 1 is also provided with a first restraint belt 3 for restraining the patient's head, and two second restraint belts 4 for restraining the patient's arms, and a control component for adjusting the railing 2, the first restraint belt 3 and the second restraint belt 4 is installed at the bottom of the bed body 1.

[0035] Specifically, the bed 1 is fixedly provided with a mounting box 5 on both sides, a support rod is connected between two legs along the long axis direction of the bed 1, the mounting box 5 is fixedly connected to the support rod, and the top surface of the mounting box 5 is flush with the top edge of the bed 1, and a mounting slot 501 for mounting the railing 2 is provided in the mounting box 5. The railing 2 includes a top rod 201, a baffle 202 is connected at the middle position of the bottom of the top rod 201, and the baffle 202 is slidably and sealedly inserted in the mounting slot 501, and baffles 203 are provided at both ends of the bottom of the top rod 201, and the baffles 203 slide through the edge of the bed 1, and two through holes for the baffles 203 to pass through are provided on both side edges of the bed 1. In order to prevent the entire railing 2 from being separated from the bed 1 and the mounting box 5, a limit plate having a size larger than the through hole on the bed 1 is provided at the bottom of the baffle 203.

[0036] The two ends of the first restraint belt 3 are interlaced with each other to form a ring structure, and the two ends of the first restraint belt 3 are provided with a first support column 6, the first support column 6 passes through the bed body 1, and the bottom of each first support column 6 is provided with a first slider 7, the first slider 7 is connected to the control component, and the bed body 1 is provided with a first sliding through hole 101 for the two first support columns 6 to slide through along the short axis direction. When the two first support columns 6 move away from each other, the two ends of the first restraint belt 3 will be pulled away from each other, thereby restraining and fixing the patient's head. When the two first support columns 6 move closer to each other, the two ends of the first restraint belt 3 move closer to each other, and the patient's head can be loosened.

[0037] Two second sliders 8 are fixedly provided at the bottom of each second restraint belt 4, and two second sliding grooves 102 matching the second sliders 8 are provided on the bed body 1 along the long axis direction. Through the mutual cooperation between the second sliders 8 and the second sliding grooves 102, the position of the second restraint belt 4 on the bed body can be moved, which is suitable for different patients and different restraint postures, such as arms lying flat or arms raised.

[0038] The two ends of the second restraint belt 4 are also interlaced with each other to form an annular structure, and one end of the second restraint belt 4 is a fixed end and the other end is a free end. The fixed end is fixedly connected to the second slider 8, and the movable end is connected to the movable rod 9 at the bottom of the bed 1 after passing the top of the railing 2 and the edge of the bed 1, and the second restraint belt 4 is slidably sleeved on the movable rod 9; one end of the movable rod 9 is provided with a second support column 10, and the other end is provided with a third slider 11. The bottom of the second support column 10 is connected with a fourth slider 26, and the fourth slider 26 is connected to the control component. The third slider 11 is slidably connected to the bottom of the bed 1, and a sliding groove matching the third slider 11 is provided on the bottom surface of the bed 1 (not shown in the figure). When the position of the second restraint belt 4 is moved along the long axis direction of the bed 1, the free end of the second restraint belt 4 moves on the movable rod 9 accordingly. When the entire movable rod 9 is moved along the short axis direction at the bottom of the bed 1, the movable rod 9 will drive the free end of the second restraint belt 4 to move, thereby tightening or loosening the second restraint belt 4. When the movable rod 9 moves from the edge of the bed 1 toward the middle, the second restraint belt 4 is tightened, thereby restraining the patient's arm. When the movable rod 9 moves from the middle of the bed 1 toward the edge, the second restraint belt 4 is loosened, thereby loosening the patient's arm.

[0039] When the multifunctional anti-fall bed in this embodiment is used, when it is necessary to restrain the patient, the patient's position is adjusted so that the patient's head is located below the first restraint belt 3, and the positions of the two second restraint belts 4 are moved along the long axis direction of the bed body 1 so that the patient's two arms are respectively located in the two second restraint belts 4. The control component controls the entire railing 2 to rise upward, which can play the role of an anti-fall bed. At the same time, the control component drives the two first support columns 6 to move away from each other, and the two second support columns 10 move toward the middle of the bed body 1, so that the two ends of the first restraint belt 3 are moved away from each other, so that the patient's head can be fixed, and the second restraint belt 4 is also tightened to fix the patient's arms.

[0040] When there is no need to restrain the patient, the control component controls the railing 2 to descend. At the same time, the two ends of the first restraint belt 3 approach each other, and the free end of the second restraint belt 4 moves toward the edge of the bed 1, so that the patient's head and arms can be loosened and the restraints on the patient are released. After the railing 2 is lowered, it can be used as an ordinary bed.

[0041] Embodiment 2: On the basis of the first embodiment, in order to realize that the control component simultaneously controls the lifting and lowering of the handrail 2 and the restraining functions of the first restraining belt 3 and the second restraining belt 4, a specific implementation of the control component is provided in this embodiment.

[0042] Specifically, the control component includes an air pump 12 installed at the bottom of the bed body 1, and the output end of the air pump 12 is connected to a sealing box 13. A piston 14 is slidably provided in the sealing box 13, and the piston 14 divides the internal space of the sealing box 13 into a first air cavity 15 and a second air cavity 16. The second air cavity 16 is close to the end of the bed, and the first air cavity 15 is close to the head of the bed; the output end of the air pump 12 is connected to the first air cavity 17, and an air inlet pipe 17 is provided between the first air cavity 15 and the installation grooves 501 of the two installation boxes 5, and an exhaust pipe 18 is provided between the second air cavity 16 and the installation grooves 501 of the two installation boxes 5, and an exhaust valve 19 is provided on the second air cavity 16.

[0043] It should be noted that the exhaust valve 19 in the present invention adopts a quantitative valve, which only allows a certain pressure of gas to be discharged. In the initial state, the initial state of the first air cavity 15 and the second air cavity 16 is 0.1 MPa, that is, normal atmospheric pressure. When the air pump 12 is turned on to inflate the first air cavity 15, the pressure in the first air cavity 15 increases, so that the pressure in the first air cavity 15 is greater than the pressure in the second air cavity 16. At this time, the gas in the first air cavity 15 enters the installation groove 501 of the installation box 5 through the air inlet pipe 17, thereby pushing the corresponding railing 2 to rise upward, playing a role in preventing the bed from falling. At the same time, the piston 14 moves toward the direction of the second air cavity 16, and a linkage assembly is provided between the piston 14 and the first slider 7 and the fourth slider 26, which can play a role in driving the first restraint belt 3 and the second restraint belt 4 to tighten. On the contrary, when the exhaust valve 19 is opened, since the air pressure in the entire inflation system is greater than the atmospheric pressure, after the gas in the installation groove 501 enters the second air cavity 16 through the exhaust pipe 18, a large amount of gas is discharged through the exhaust valve 19, the railing 2 descends under the action of gravity, and the baffle 202 is stored in the installation box 5. Since the exhaust valve 19 is quantitatively discharged, under the combined action of the gravity of the railing 2 and the atmospheric pressure difference, the pressure in the second air cavity 16 is greater than the pressure in the first air cavity 15, which will drive the piston 14 to return to its original state, and the pressure in the first air cavity 15 and the second air cavity 16 remains balanced.

[0044] More specifically, the linkage assembly includes a piston push rod 20 connected to the piston 14, the piston push rod 20 is sealed and slides through the sealing box 13, the end of the piston push rod 20 away from the piston 14 is fixedly connected to a connecting plate 21, the connecting plate 21 includes a middle section 2101 and triangular connecting plates 2102 symmetrically arranged on both sides of the middle section 2101, the top angles of the triangular connecting plates 2102 are facing the head of the bed 1, and each of the triangular connecting plates 2102 is provided with a limiting rod 2103 at the top angle, and two limiting blocks 22 matching the limiting rods 2103 are provided at the bottom of the bed 1, and the limiting rods 2103 slide through the limiting blocks 22, so that the entire connecting plate 21 can be more stable when it moves along the long axis direction of the bed 1 under the action of the piston 14 and the piston push rod 20.

[0045] A first limiting rail 23 matching the first support column 6 is also installed at the bottom of the bed 1 along the short axis direction. The two first support columns 6 are slidably set in the first limiting rail 23, so that the first support column 6 can only move along the short axis direction of the bed 1. The side walls of the two triangular connecting plates 2102 close to each other are provided with a first slide rail 24, and the two first sliders 7 are slidably set in the first slide rails 24 corresponding to each other.

[0046] Two second limiting rails 25 are symmetrically arranged on both sides of the first limiting rail 23, and the second limiting rails 25 match the second support column 10, and each of the second support columns 10 is slidably arranged in the corresponding second limiting rail 25, so that the second support column 10 can only move along the short axis direction of the bed body 1. Second slide rails 27 are arranged on the side walls of the two triangular connecting plates 2102 away from each other, and the fourth slider 26 is slidably arranged in the corresponding second slide rails 27.

[0047] The working principle of the control component in this embodiment is specifically as follows: when the air pump 12 is turned on to inflate the first air cavity 15, the gas in the first air cavity 15 enters the installation groove 501 of the installation box 5 through the air inlet pipe 17, thereby pushing the corresponding railing 2 to rise upward, thereby preventing the bed from falling. At the same time, the piston 14 moves toward the direction of the second air chamber 16, driving the piston push rod 20 to move synchronously, and the piston push rod 20 pulls the entire connecting plate 21 to move toward the end of the bed. The mutual cooperation of the limit block 22 and the limit rod 2103 ensures the stability of its movement process; since the vertex direction of the two triangular connecting plates 2102 on the connecting plate 21 is toward the head of the bed, therefore, when the two triangular connecting plates 2102 move synchronously toward the end of the bed of the bed 1, the mutual cooperation of the two first sliding blocks 7 and the first slide rail 24, combined with the limiting effect of the first support column 6 and the first limiting rail 23, makes the first support column 6 move away from each other as the connecting plate 21 moves. Similarly, the two second support columns 10 also move toward the middle position of the bed 1 as the connecting plate 21 moves, thereby tightening the first restraint belt 3 and the second restraint belt 4 to restrain the patient's head and arms.

[0048] On the contrary, when the exhaust valve 19 is opened to exhaust, the gas in the installation groove 501 enters the second air cavity 16 through the exhaust pipe 18, and a large amount of gas is discharged through the exhaust valve 19. The railing 2 descends under the action of gravity, and the baffle 202 is stored in the installation box 5. At the same time, the piston 14 is reset to its original state, that is, the piston 14 moves toward the first air cavity 15, pushing the entire connecting plate 21 to move toward the head of the bed. Under the mutual cooperation of the two first sliding blocks 7 and the first slide rail 24, and the limiting action of the first support column 6 and the first limiting track 23, the two first support columns 6 approach each other, the first restraint belt 3 is loosened, and the restraint on the patient's head is released; similarly, the two second support columns 10 both move toward the edge of the bed body 1, so that the second restraint belt 4 is loosened, and the restraint on the patient's arm is released.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multifunctional anti-fall bed, comprising a bed body (1), wherein railings (2) are movably provided on both sides of the bed body (1). Features: The bed body (1) is also provided with a first restraint belt (3) for restraining the patient's head, and two second restraint belts (4) for restraining the patient's arms, and a control component for adjusting the railing (2), the first restraint belt (3) and the second restraint belt (4) is installed at the bottom of the bed body (1).

2. A multifunctional anti-fall bed according to claim 1, Features: Both sides of the bed body (1) are provided with installation boxes (5), and the installation boxes (5) are provided with installation grooves (501) for installing the handrails (2), and the installation grooves (501) are connected to the control components.

3. A multifunctional anti-fall bed according to claim 2, Features: The two ends of the first restraint belt (3) are interlaced with each other, and both ends of the first restraint belt (3) are provided with a first support column (6), the first support column (6) passes through the bed body (1), and the bottom of each first support column (6) is provided with a first slider (7), and the first slider (7) is connected to the control component.

4. A multifunctional anti-fall bed according to claim 3, Features: The two ends of the second restraint belt (4) are also interlaced with each other, and the fixed end of the second restraint belt (4) is slidably connected to the top surface of the bed body (1), and the free end of the second restraint belt (4) is connected to the movable rod (9) after passing through the railing (2) and the edge of the bed body (1), and the movable rod (9) is slidably connected to the bottom of the bed body (1), and the movable rod (9) is connected to the control component.

5. A multifunctional anti-fall bed according to claim 3, Features: One end of the movable rod (9) is connected to a second support column (10), and the other end is provided with a third slider (11); the bottom of the second support column (10) is connected to a fourth slider (26); the fourth slider (26) is connected to the control component; and the third slider (11) is slidably connected to the bottom of the bed body (1).

6. A multifunctional anti-fall bed according to claim 5, Features: The control component comprises an air pump (12) mounted at the bottom of the bed (1), the output end of the air pump (12) being connected to a sealing box (13), a piston (14) being slidably disposed in the sealing box (13), an air inlet pipe (17) and an air outlet pipe (18) being connected between the mounting groove (501) and the sealing box (13), and a linkage component being disposed between the piston (14) and the first slider (7) and the fourth slider (26).

7. A multifunctional anti-fall bed according to claim 6, Features: The linkage assembly comprises a piston push rod (20) connected to the piston (14); the piston push rod (20) is sealed and slidably penetrates the sealing box (13); one end of the piston push rod (20) away from the piston (14) is fixedly connected to a connecting plate (21); and the first slider (7) and the fourth slider (26) are both slidably connected to the connecting plate (21).

8. A multifunctional anti-fall bed according to claim 7, Features: The connecting plate (21) comprises a middle section (2101) connected to the piston push rod (20), and triangular connecting plates (2102) symmetrically arranged on both sides of the middle section (2101), the top corners of the triangular connecting plates (2102) facing the head of the bed body (1), and a limiting rod (2103) is provided at the top corner of each triangular connecting plate (2102), and two limiting blocks (22) matching the limiting rods (2103) are provided at the bottom of the bed body (1).

9. The multifunctional anti-fall bed according to claim 8, Features: A first limiting rail (23) matching the first supporting column (6) is installed at the bottom of the bed body (1) along the short axis direction, and first slide rails (24) are provided on the side walls of the two triangular connecting plates (2102) close to each other, and the two first sliding blocks (7) are slidably arranged in the first slide rails (24) corresponding to each other.

10. The multifunctional anti-fall bed according to claim 8, Features: Two second limiting rails (25) matching the second supporting column (10) are symmetrically arranged on both sides of the first limiting rail (23); second slide rails (27) are arranged on the side walls of the two triangular connecting plates (2102) that are away from each other; and the fourth sliding block (26) is slidably arranged in the corresponding second slide rails (27).

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