A wall building device

Abstract

The application provides a wall building device, which comprises a workbench arranged on the top of a scissor lifting frame, a lifting mechanism arranged on the workbench and used for placing bricks and adjusting the height of the bricks, a winding mechanism arranged on the side of the workbench and used for lifting a mortar bucket, and a driving mechanism arranged on the workbench and used for simultaneously driving the lifting mechanism and the winding mechanism. The driving mechanism drives the lifting mechanism to operate, and then drives the holding plate to move upwards, and then moves the bricks to a suitable height. The driving mechanism also drives the winding mechanism to operate, and then drives the rope to wind, so that the mortar bucket with the free end of the rope fixed is moved upwards, thereby avoiding the workers from bending down to take the bricks, and facilitating the workers to move the mortar bucket filled with cement on the ground to the workbench, and thereby reducing the working strength of the workers.

Description

Technical Field

[0001] This invention relates to the field of wall construction, and in particular to a wall construction device. Background Technology

[0002] Masonry walls are walls constructed from bricks or blocks. They are one of the main building components, serving to enclose and bear weight. Brick walls are a type of masonry wall and have the advantages of heat insulation, sound insulation, and heat preservation. Brick walls are composed of two materials: bricks and mortar. The mortar binds the bricks together to form the wall.

[0003] With the rapid development of the construction industry, there are now many liftable work platforms on the market for bricklaying operations, which facilitate the upward transfer of bricks used for bricklaying layer by layer, and allow construction workers to stand and carry out bricklaying operations.

[0004] In manual bricklaying, workers turn around to pick up bricks from above a support plate. As bricks are used, the height of the bricks above the support plate gradually decreases. This requires workers to bend over to pick up bricks, increasing their workload and potentially leading to back injuries from prolonged bending. Therefore, a wall-building device is proposed to address these problems. Summary of the Invention

[0005] The main objective of this invention is to provide a wall masonry device that solves the problem of construction workers having to bend over for long periods of time during bricklaying.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a wall construction device, including a work platform set on the top of a scissor lift frame, a lifting mechanism for placing bricks and adjusting the height of bricks on the work platform, a winding mechanism for lifting a mud bucket onto the side of the work platform, and a drive mechanism for simultaneously driving the lifting mechanism and the winding mechanism on the work platform.

[0007] In a preferred embodiment, the workbench is provided with an opening to accommodate a lifting mechanism. The lifting mechanism includes a first scissor lift disposed in the opening and a serving plate disposed on top of the first scissor lift. The upper and lower ends of one side of the first scissor lift are hinged to the opening and the inner wall of the serving plate, respectively. The upper and lower ends of the other side are rotatably and laterally slidably connected to the serving plate and the wall of the opening via a top connecting rod and a bottom connecting rod, respectively. A threaded block is provided on the outside of the bottom connecting rod.

[0008] In a preferred embodiment, the winding mechanism includes a driven gear, one end of which rotatably passes through the side wall of the workbench and is connected to a rotating plate. The side of the rotating plate is provided with several annularly distributed rope winding plates, one of which is connected to a rope. A limit plate is provided at the end of the rotating plate away from the rotating plate.

[0009] In a preferred embodiment, the drive mechanism includes a threaded rod rotatably disposed at the bottom of the worktable and a transmission assembly disposed at the top of the worktable. The threaded block is threadedly connected to the threaded rod. A transmission gear that meshes with the driven gear is also disposed on the outside of the threaded rod. The transmission assembly includes a column disposed at the top of the worktable. A first rotating shaft is rotatably disposed through the column. A handle is disposed at one end of the first rotating shaft, and a sprocket assembly is disposed between the other end and the threaded rod.

[0010] In a preferred embodiment, the sprocket assembly includes drive sprockets respectively disposed outside the threaded rod and at the end of the first shaft, and a drive chain fitted around the two drive sprockets.

[0011] In a preferred embodiment, the rotating plate is further provided with a first limiting groove corresponding to the number of rope winding plates. A slider is provided at one end of the rope winding plate near the first limiting groove and is slidably connected thereto. An expansion transmission mechanism is rotatably provided through the driven gear and the center of the rotating plate to control the rope winding plate to slide in the first limiting groove.

[0012] In a preferred embodiment, the expansion transmission mechanism includes a push rod that passes through the center of the driven gear and the rotating plate. One end of the push rod is connected to the connecting sliding rod at the upper end of the scissor lift frame, and the other end is rotatably provided with a first sleeve. The first sleeve is hinged to each rope winding plate with a connecting rod.

[0013] In a preferred embodiment, a second sleeve is rotatably provided at the center of the driven gear and the rotating plate, a push rod is provided through the second sleeve, a limit block is provided on the inner wall of the second sleeve, and a second limit groove is provided on the outer wall of the push rod to slide and connect with the limit block.

[0014] In a preferred embodiment, the column is further provided with a guide mechanism, which includes a second rotating shaft rotatably disposed on the side of the column and a guide wheel disposed outside the second rotating shaft, with the free end of the rope passing through the guide wheel and extending to the ground;

[0015] The rope has multiple connecting holes at equal intervals.

[0016] In a preferred embodiment, the side of the holding plate is provided with a sliding groove for the top connecting rod to slide laterally, the end of the top connecting rod is inserted through the sliding groove, and the top of the holding plate is also provided with an anti-fall component to prevent bricks from falling.

[0017] The fall arrestor includes a lifting assembly installed on top of the holding plate, a top frame installed on the lifting assembly, and a fall arrestor net installed between the holding plate and the top frame, wherein the lifting assembly and the holding plate are in opposite lifting directions.

[0018] The lifting assembly includes a second scissor lift. Slide grooves are provided on opposite sides of the serving plate and the top frame. The upper and lower ends of one side of the second scissor lift intersect with the serving plate and the top frame, respectively. The upper and lower ends of the other side are rotatably and laterally slidably connected to the slide grooves. A hinge shaft is provided on the outer side of the rotating plate of the second scissor lift near the top frame. A transmission rod is rotatably provided between the end of the top connecting rod and the hinge shaft. The top connecting rod and the sliding end of the second scissor lift move in opposite directions.

[0019] This invention provides a wall construction device, which has the following beneficial effects:

[0020] 1. The driving mechanism drives the lifting mechanism to move the holding plate upward, thereby moving the bricks to a suitable height. At the same time, the driving mechanism drives the winding mechanism to move the rope to wind up, so that the mud bucket fixed at the free end of the rope moves upward, thus avoiding the worker bending over to pick up the bricks. It also makes it easier for the worker to move the mud bucket containing cement on the ground to the work platform, thereby reducing the worker's workload.

[0021] 2. The transmission mechanism enables the rope winding plate in the winding mechanism to expand outward as the worktable moves upward, so that the distance the worktable rises is equal to the length of the rope winding around the outer wall of several sets of rope winding plates. This allows the worktable to be raised to any height, and the mud bucket on the ground can be moved to the worktable by the drive mechanism, while the holding plate is also moved to the appropriate height.

[0022] 3. By setting up an anti-fall component that is linked to the lifting mechanism, the height of the device can be adaptively adjusted according to the height of the bricks to prevent the bricks from falling. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the rear cross-sectional structure of the worktable of the present invention;

[0026] Figure 3 This is a schematic diagram of the workbench structure of the present invention viewed from below;

[0027] Figure 4 This is the present invention. Figure 3 Enlarged structural diagram of section A;

[0028] Figure 5 This is the present invention. Figure 3 Enlarged structural diagram of section B;

[0029] Figure 6This is a schematic diagram of the overall structure of the winding mechanism of the present invention;

[0030] Figure 7 This is an exploded view of the push rod, the first sleeve, and the second gear of the present invention;

[0031] Figure 8 This is a schematic diagram of the left-side cross-sectional structure of the workbench of the present invention;

[0032] Figure 9 This is the present invention. Figure 8 Enlarged structural diagram of section C;

[0033] Figure 10 This is the present invention. Figure 8 Enlarged structural diagram of section D in the middle;

[0034] Figure 11 This is a structural diagram showing the connection between the holding plate and the fall protection component of this invention;

[0035] Figure 12 This is a structural diagram of the lifting component of the present invention;

[0036] In the diagram: 1. Workbench; 2. Opening; 3. Lifting mechanism; 31. Container plate; 32. First scissor lift; 33. Bottom connecting rod; 34. Threaded block; 35. Top connecting rod; 4. Column; 5. Drive mechanism; 51. First rotating shaft; 52. Sprocket assembly; 53. Threaded rod; 54. Transmission gear; 55. Handle; 6. Winding mechanism; 61. Driven gear; 62. Rotating plate; 63. First limiting groove; 64. Rope winding plate; 65. Limiting plate; 7. Expansion transmission mechanism; 7. Connecting sliding rod. 1; Push rod 72; Second sleeve 73; Second limiting groove 74; Limiting block 75; First sleeve 76; Connecting rod 77; Guide mechanism 8; Second rotating shaft 81; Guide wheel 82; Scissor lift frame 9; Base 10; Rope 11; Telescopic rod 12; First crossbar 13; Second crossbar 14; Lifting assembly 15; Top frame 16; Fall protection net 17; Slide groove 151; Second scissor frame 152; Hinge shaft 153; Transmission rod 154; Detailed Implementation

[0037] Example 1

[0038] like Figure 1-6 As shown in Figures 8-10, a wall construction device includes a worktable 1 set on top of a scissor lift frame 9, a base 10 with casters connected to the bottom of the scissor lift frame 9, a lifting mechanism 3 for placing bricks and adjusting the height of the bricks on the worktable 1, a winding mechanism 6 for lifting a mud bucket onto the side of the worktable 1, and a drive mechanism 5 for simultaneously driving the lifting mechanism 3 and the winding mechanism 6 on the worktable 1.

[0039] In use, the drive mechanism 5 drives the lifting mechanism 3 to move, which in turn moves the bricks above the lifting mechanism 3 upwards, so that the bricks are moved to a suitable height for workers to pick up, avoiding the need for workers to bend over to pick up bricks, thereby reducing the workers' workload and preventing the problem of increased back injury caused by prolonged bending over. At the same time, the drive mechanism 5 also drives the winding mechanism 6 to move the mud bucket containing cement on the ground to the workbench 1, which makes it easier for workers to move the mud bucket and reduces the workers' workload.

[0040] In a preferred embodiment, the workbench 1 is provided with an opening 2 to accommodate the lifting mechanism 3. The lifting mechanism 3 includes a first scissor lift 32 disposed in the opening 2 and a serving plate 31 disposed on top of the first scissor lift 32. When the serving plate 31 is completely lowered into the opening 2, its top is flush with the workbench 1.

[0041] In this embodiment, the upper and lower ends of one side of the first scissor lift 32 are hinged to the opening 2 and the inner wall of the serving plate 31, respectively. The upper and lower ends of the other side are rotatably and laterally slidably connected to the serving plate 31 and the wall of the opening 2 through the top connecting rod 35 and the bottom connecting rod 33, respectively. In this embodiment, the walls of the serving plate 31 and the opening 2 are provided with sliding grooves for the top connecting rod 35 or the bottom connecting rod 33 to rotatably slide laterally. The bottom connecting rod 33 is provided with a threaded block 34 on its outside.

[0042] In use, the movement of the threaded block 34 drives the movement of the bottom connecting rod 33, which in turn drives the movement of the first scissor lift 32, thereby moving the holding plate 31 upward and moving the bricks to a suitable height for workers to pick up.

[0043] In a preferred embodiment, the winding mechanism 6 includes a driven gear 61, one end of which rotatably passes through the side wall of the workbench 1 and is connected to a rotating plate 62. A bearing is provided in the side wall of the workbench 1 for the driven gear 61 to rotatably pass through. Several annularly distributed rope winding plates 64 are provided on the side of the rotating plate 62. In this embodiment, there are four rope winding plates 64, one of which is connected to a rope 11. A limit plate 65 is provided at the end of the rotating plate 62 away from the rotating plate 62.

[0044] In use, the rotation of the driven gear 61 drives the rotating plate 62 to rotate, and the rotation of the rotating plate 62 drives the rope winding plate 64 to rotate, thereby winding and unwinding the rope 11, thus achieving the effect of lifting the mud bucket. The limit plate 65 ensures that the rope 11 will not detach from the rope winding plate 64 when the rope winding plate 64 is winding around the rope 11.

[0045] In a preferred embodiment, the drive mechanism 5 includes a threaded rod 53 rotatably mounted on the bottom of the workbench 1 and a transmission assembly mounted on the top of the workbench 1. One end of the threaded rod 53 is rotatably connected to the side wall of the workbench 1, and the other end is threadedly connected to the threaded block 34. A transmission gear 54 that meshes with the driven gear 61 is also provided on the outside of the threaded rod 53. The transmission assembly includes a column 4 mounted on the top of the workbench 1. A first rotating shaft 51 is rotatably mounted through the column 4. A handle 55 is provided at one end of the first rotating shaft 51, and a sprocket assembly 52 is provided between the other end and the threaded rod 53.

[0046] The sprocket assembly 52 includes a drive sprocket respectively disposed outside the threaded rod 53 and at the end of the first rotating shaft 51, and a drive chain 52 fitted around the two drive sprockets.

[0047] In use, the first rotating shaft 51 is rotated by holding the handle 55. Since the threaded rod 53 is connected to the first rotating shaft 51 through the sprocket set 52, the threaded rod 53 is rotated. Since the left end of the threaded rod 53 passes through the threaded block 34 and is threadedly connected to the threaded block 34, the rotating threaded rod 53 drives the threaded block 34 to move, thus providing power for the movement of the threaded block 34 and realizing the lifting and lowering of the first scissor lift 32. At the same time, through the meshing of the driven gear 61 and the transmission gear 54, the rotating plate 62 and the rope winding plate 64 are driven to rotate.

[0048] It should be noted that the scissor lift frame 9 has a first crossbar 13 and a second crossbar 14 fixedly connected inside. A telescopic rod 12 is connected between the first crossbar 13 and the second crossbar 14. The activation of the telescopic rod 12 drives the second scissor frame 9 to move, thereby providing power for the worktable 1 to move up or down. The scissor lift frame 9 is a commonly used technical means in this field, so it will not be described in detail again.

[0049] Example 2

[0050] Further explanation in conjunction with Example 1, such as Figure 3 , 6 As shown in Figure 7, the rotating plate 62 is also provided with a first limiting groove 63 corresponding to the number of winding plates 64. A slider is fixedly provided at one end of the winding plate 64 near the first limiting groove 63 and slidably connected thereto. An expansion transmission mechanism 7 is rotatably provided through the driven gear 61 and the center of the rotating plate 62 to control the winding plate 64 to slide in the first limiting groove 63.

[0051] The expansion transmission mechanism 7 includes a push rod 72 that passes through the center of the driven gear 61 and the rotating plate 62. One end of the push rod 72 is connected to the connecting sliding rod 71 at the upper end of the scissor lift frame 9, and the other end is rotatably provided with a first sleeve 76. The first sleeve 76 is hinged to each rope winding plate 64 with a connecting rod 77.

[0052] During use, the scissor lift 9 moves, causing the connecting sliding rod 71 to move laterally, which in turn causes the push rod 72 to move laterally. The push rod 72 causes the first sleeve 76 to move laterally, which in turn causes the connecting rod 77 to move. The moving connecting rod 77 causes the rope-winding plate 64 to expand outward, so that the distance the worktable 1 moves upward is equal to the length of the rope 11 wrapped around the outer wall of several sets of rope-winding plates 64. Therefore, at any height of the worktable 1, the distance the holding plate 31 moves upward is the same as the number of rotations of the rotating plate 62, thus achieving the goal of moving the mud bucket on the ground to the worktable 1 while simultaneously moving the bricks to the appropriate height.

[0053] In a preferred embodiment, a second sleeve 73 is rotatably provided at the center of the driven gear 61 and the rotating plate 62. The push rod 72 is inserted through the second sleeve 73. A limiting block 75 is fixed on the inner wall of the second sleeve 73. A second limiting groove 74 is provided on the outer wall of the push rod 72 and is slidably connected to the limiting block 75. In this embodiment, there are two corresponding limiting blocks 75 and two corresponding second limiting grooves 74.

[0054] The second sleeve 73 allows the push rod 72 to both rotate and slide inside the driven gear 61.

[0055] In a preferred embodiment, the column 4 is further provided with a guide mechanism 8. The guide mechanism 8 includes a second rotating shaft 81 rotatably disposed on the side of the column 4, and a guide wheel 82 fixed outside the second rotating shaft 81. The free end of the rope 11 extends to the ground through the guide wheel 82, so that the mud bucket fixed on the rope 11 can be moved above the workbench 1 during the winding process, thereby making it easier for workers to pick up the mud bucket on the rope 11.

[0056] The rope 11 has multiple connecting holes at equal intervals. The connecting holes on the side wall of the rope 11 make it easy to fix the mud bucket with an "S" hook onto the rope 11.

[0057] Example 3

[0058] Further explanation in conjunction with Examples 1 and 2, such as Figure 11-12 As shown in the structure, the side of the holding plate 31 is provided with a sliding groove for the top connecting rod 35 to slide laterally, and the end of the top connecting rod 35 is provided through the sliding groove. The top of the holding plate 31 is also provided with an anti-fall component to prevent bricks from falling.

[0059] The fall protection assembly includes a lifting assembly 15 disposed on the top of the holding plate 31, a top frame 16 disposed on the lifting assembly 15, and a fall protection net 17 disposed between the holding plate 31 and the top frame 16. In this embodiment, the fall protection net 17 is a flexible iron mesh, wherein the lifting assembly 15 and the holding plate 31 are in opposite lifting directions.

[0060] When in use, the higher the bricks are placed on the holding plate 31, the lower the working height of the holding plate 31 becomes. Therefore, by setting the lifting component 15 to be opposite to the lifting direction of the holding plate 31, the height of the top frame 16 and the fall protection net 17 can be reduced as the holding plate 31 is raised. Consequently, the height of the top frame 16 and the fall protection net 17 is also reduced as the bricks are lowered.

[0061] The lifting assembly 15 includes a second scissor lift 152. The receiving plate 31 and the top frame 16 are provided with sliding grooves 151 on opposite sides. The upper and lower ends of one side of the second scissor lift 152 intersect with the receiving plate 31 and the top frame 16 respectively, and the upper and lower ends of the other side are rotatably and laterally slidably connected to the sliding grooves 151 respectively. The rotating plate of the second scissor lift 152 is fixedly provided with a hinge shaft 153 near the outer side of the top frame 16. The end of the top connecting rod 35 is rotatably fitted with a transmission rod 154 between the hinge shaft 153 and the end of the top connecting rod 35. The top connecting rod 35 and the sliding end of the second scissor lift 152 move in opposite directions.

[0062] When in use, when the first scissor lift 32 starts to rise and fall, it will drive the top connecting rod 35 to slide in the sliding groove, and then the transmission rod 154 will abut against the second scissor lift 152, thereby realizing the rise and fall of the second scissor lift 152 and adjusting the height of the top frame 16 and the fall protection net 17. When it is necessary to place bricks on the holding plate 31, the transmission rod 154 can be removed, and the top frame 16 and the fall protection net 17 will lose their support and fall completely onto the holding plate 31.

[0063] It should be noted that the scissor lift mechanism in this invention is a mature existing technology, and therefore will not be described in detail here.

[0064] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A wall construction device, comprising a worktable (1) disposed on top of a scissor lift frame (9), characterized in that: The workbench (1) is equipped with a lifting mechanism (3) for placing bricks and adjusting the height of bricks. The side of the workbench (1) is equipped with a winding mechanism (6) for lifting the mud bucket onto it. The workbench (1) is also equipped with a driving mechanism (5) for simultaneously driving the lifting mechanism (3) and the winding mechanism (6). The workbench (1) is provided with an opening (2) to accommodate the lifting mechanism (3). The lifting mechanism (3) includes a first scissor lift (32) provided in the opening (2) and a serving plate (31) provided on the top of the first scissor lift (32). The upper and lower ends of one side of the first scissor lift (32) are hinged to the inner walls of the opening (2) and the serving plate (31) respectively. The upper and lower ends of the other side are rotatably and laterally slidably connected to the serving plate (31) and the wall of the opening (2) through a top connecting rod (35) and a bottom connecting rod (33) respectively. A threaded block (34) is provided on the outside of the bottom connecting rod (33). The winding mechanism (6) includes a driven gear (61), one end of which is rotatably passed through the side wall of the workbench (1) and connected to a rotating plate (62). The side of the rotating plate (62) is provided with several annularly distributed rope winding plates (64), and a rope (11) is connected to one of the rope winding plates (64). The drive mechanism (5) includes a threaded rod (53) rotatably disposed at the bottom of the workbench (1), a threaded block (34) threadedly connected to the threaded rod (53), and a transmission gear (54) meshing with the driven gear (61) is also provided on the outside of the threaded rod (53). The rotating plate (62) is also provided with a first limiting groove (63) corresponding to the number of winding plates (64). A slider is provided at one end of the winding plate (64) near the first limiting groove (63) and is slidably connected thereto. An expansion transmission mechanism (7) is rotatably provided through the center of the driven gear (61) and the rotating plate (62) to control the winding plate (64) to slide in the first limiting groove (63). The expansion transmission mechanism (7) includes a push rod (72) that passes through the center of the driven gear (61) and the rotating plate (62). One end of the push rod (72) is connected to the connecting sliding rod (71) at the upper end of the scissor lift frame (9), and the other end is rotatably provided with a first sleeve (76). The first sleeve (76) is hinged to each rope winding plate (64) with a connecting rod (77). During the movement of the scissor lift (9), the connecting sliding rod (71) moves laterally, which in turn drives the push rod (72) to move laterally. The push rod (72) drives the first sleeve (76) to move laterally, which in turn drives the connecting rod (77) to move. The moving connecting rod (77) drives the rope plate (64) to expand outward.

2. The wall construction device according to claim 1, characterized in that: A limit plate (65) is provided at the end of the rotating plate (62) away from the rotating plate (62).

3. The wall construction device according to claim 1, characterized in that: The drive mechanism (5) also includes a transmission assembly set on the top of the workbench (1). The transmission assembly includes a column (4) set on the top of the workbench (1). A first rotating shaft (51) is rotatably provided through the column (4). A handle (55) is provided at one end of the first rotating shaft (51), and a sprocket set (52) is provided between the other end and the threaded rod (53).

4. The wall construction device according to claim 3, characterized in that: The sprocket assembly (52) includes a drive sprocket disposed on the outside of the threaded rod (53) and at the end of the first rotating shaft (51), and a drive chain (52) fitted on the outside of the two drive sprockets.

5. The wall construction device according to claim 1, characterized in that: A second sleeve (73) is rotatably provided at the center of the driven gear (61) and the rotating plate (62). The push rod (72) is provided through the second sleeve (73). A limit block (75) is provided on the inner wall of the second sleeve (73). A second limit groove (74) is provided on the outer wall of the push rod (72) and is slidably connected to the limit block (75).

6. A wall construction device according to claim 3 or 4, characterized in that: The column (4) is also provided with a guide mechanism (8). The guide mechanism (8) includes a second rotating shaft (81) rotatably disposed on the side of the column (4) and a guide wheel (82) disposed outside the second rotating shaft (81). The free end of the rope (11) extends to the ground through the guide wheel (82). Multiple connection holes are equidistantly arranged on the rope (11).

7. The wall construction device according to claim 1, characterized in that: The side of the holding plate (31) is provided with a sliding groove for the top connecting rod (35) to rotate and slide laterally. The end of the top connecting rod (35) is inserted through the sliding groove. The top of the holding plate (31) is also provided with an anti-fall component to prevent bricks from falling. The fall arrestor includes a lifting assembly (15) installed on top of the holding plate (31), a top frame (16) installed on the lifting assembly (15), and a fall arrestor net (17) installed between the holding plate (31) and the top frame (16), wherein the lifting assembly (15) and the holding plate (31) are in opposite directions of lifting. The lifting assembly (15) includes a second scissor lift (152). Slide grooves (151) are provided on opposite sides of the serving plate (31) and the top frame (16). The upper and lower ends of one side of the second scissor lift (152) intersect with the serving plate (31) and the top frame (16) respectively. The upper and lower ends of the other side are rotatably and laterally slidably connected to the slide grooves (151). A hinge shaft (153) is provided on the outer side of the rotating plate of the second scissor lift (152) near the top frame (16). A transmission rod (154) is rotatably provided between the end of the top connecting rod (35) and the hinge shaft (153). The top connecting rod (35) and the sliding end of the second scissor lift (152) move in opposite directions.

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