Integrated straight ladder

Abstract

The present invention relates to the technical field of tools for upper and lower multi-layer cabins of ships, and discloses an integrated straight ladder, including: an extended steel frame, the extended steel frame is a strip-shaped steel plate passing through channels opened in multiple large cabins, and a plurality of mounting brackets are uniformly installed on the surface of the extended steel frame through bolts. One end of the mounting bracket is provided with a circular plate-shaped support foot, and the mounting bracket is attached to and welded to the side wall of the ship's cabin through the circular plate-shaped support foot. For this integrated straight ladder, by setting the extended steel frame and the mounting bracket as a split-type installation, the welding amount between the passing straight ladder and the ship's cabin during installation is reduced. Then, by setting an anti-falling component and installing the anti-falling component on the side of the extended steel frame, the situation of welding the anti-falling railing again is avoided, and the situation of subsequent repair welding is avoided. Furthermore, the effect of protecting the paint of the structure of the passing straight ladder is achieved, and there is no need to worry about the rusting of the passing straight ladder due to the paint repair dead angle. Thus, the service life of the passing straight ladder is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tools for going up and down multi - layer cabins of ships, and specifically to an integrated straight ladder. Background Art

[0002] Ships are the main tools for completing waterborne cargo transportation, generally large cargo ships. Currently, in the cabins of ships, if there are large multi - layer cabins, in order to save space and facilitate the use of crew members, access straight ladders, handrails, and anti - fall railings are generally set up to enable short - distance up - and - down connection between multi - layer large cabins, which is beneficial for the crew to pass through emergently.

[0003] However, for the existing up - and - down connection channels between multi - layer large cabins of ships, it is necessary to first cut and leave a space, and then after installing the access straight ladder, it is also necessary to weld anti - fall railings at the cut - and - left channel. If the handrails and anti - fall railings are missed during the initial installation of the access straight ladder for convenience, it will cause damage to the structural paint during later installation. Touch - up painting is extremely troublesome later, and it is also easy to have touch - up painting dead corners, which will reduce the service life of the access straight ladder. After a long time of use, it is easy to cause dangerous situations for passing crew members. Moreover, currently, the access straight ladders are all set at a ninety - degree vertical angle. When crew members walk back and forth between multi - layer large cabins of ships through the access straight ladder, they need to always hold the access straight ladder tightly, otherwise they will fall backward, which is easy to cause danger. At the same time, it is also difficult to carry objects through, reducing the practicality of the access straight ladder. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides an integrated straight ladder, which solves the problems mentioned in the above background.

[0005] The present invention provides the following technical solutions: an integrated straight ladder, including: a lengthened steel frame, the lengthened steel frame is a strip - shaped steel plate passing through channels opened in multi - layer cabins, a plurality of mounting brackets are evenly installed on the surface of the lengthened steel frame through bolts, one end of the mounting bracket is provided with a circular plate - shaped support foot, the mounting bracket is attached to and welded to the cabin side wall through the circular plate - shaped support foot, a connecting rod is rotatably arranged at the inner wall of the lengthened steel frame near the bottom, a ladder frame is arranged on the side of the connecting rod away from the lengthened steel frame through a rotating shaft, an anti - fall component is fixedly installed on the surface of the lengthened steel frame through bolts, the number of the anti - fall components corresponds to the number of cabin layers, the anti - fall components are located at the reserved up - and - down channels of each layer of the cabin, a lifting component is arranged at the inner wall of the lengthened steel frame, and the internal structure of the lifting component is linked and rotatably connected to the side wall near the top of the ladder frame. A top control component is rotatably arranged at the inner wall of the lengthened steel frame near the top of the lifting component through a bearing, the top control component is linked during rotation with the lifting component, a bottom control component is arranged on the surface of the lengthened steel frame near the bottom, and the bottom control component is linked during rotation with the top control component.

[0006] Preferably, a plurality of steps arranged in a stepped manner are fixedly mounted on the inner wall of the ladder frame, each step is two steel pipes arranged side by side, and the steel pipes in the steps close to the back of the ladder frame are located at the center line of the ladder frame from top to bottom.

[0007] Preferably, the anti-fall component includes an anti-fall frame, both ends of the anti-fall frame are welded with mounting plates, the anti-fall component is installed on the side of the extended steel frame through the mounting plate, the surface of the anti-fall frame is fixedly sleeved with a hinge, and an anti-fall cover is rotatably provided above the anti-fall frame through the hinge, the anti-fall cover is a steel bar welded in a quadrilateral closed loop, and the quadrilateral corners of the anti-fall cover are set as arc-shaped chamfers, and the inner wall of the anti-fall cover is evenly welded with a number of protective rods.

[0008] Preferably, three sides of the quadrilateral of the anti-fall cover overlap with the anti-fall frame and overlap above the anti-fall frame, and two of the several protective rods welded inside the anti-fall cover penetrate the anti-fall cover and overlap the surface of the anti-fall frame near one end of the mounting plate.

[0009] Preferably, the top control assembly includes a first shaft, a first moving wheel is fixedly sleeved on the middle part of the first shaft, the first moving wheel is transmission-connected to the bottom control assembly through a belt, a scroll is fixedly sleeved on the surface of the first shaft near both ends, the first shaft is linked to the lifting assembly through the scroll, and one end of the first shaft passes through the extended steel frame and is fixedly installed with a first crank handle for controlling the rotation of the top control assembly.

[0010] Preferably, the top control assembly is located behind the center line of the elongated steel frame from top to bottom, and the outer edge of the first moving wheel does not exceed the center line of the elongated steel frame from top to bottom.

[0011] Preferably, the bottom control assembly includes a second shaft rod, a second moving wheel is fixedly sleeved on the middle part of the second shaft rod, the second moving wheel is transmission-connected to the top control assembly through a belt, the surfaces of the second shaft rod near both ends are rotatably sleeved with a coupling assembly through bearings, the coupling assembly is fixedly installed on the inner side of the elongated steel frame, one end of the second shaft rod passes through the elongated steel frame and is fixedly installed with a second crank handle for controlling the rotation of the bottom control assembly.

[0012] Preferably, the coupling assembly includes a fixed block, which is a square block-shaped fixed steel structure part. One end of the fixed block protrudes from the rear of the extended steel frame and is used to rotate and set the second shaft rod. The other end of the fixed block is located behind the center line of the extended steel frame from top to bottom, and a plastic pad is fixedly installed on the end of the fixed block close to the center line of the extended steel frame.

[0013] Preferably, the lifting assembly includes a groove, a quadrilateral convex ring strip is welded on the outer edge of the groove near the outer opening, a partition is provided on the inner wall of the groove near the top, the bottom of the inner wall of the groove is rotatably connected to a screw rod through a bearing, the surface of the screw rod is threadedly sleeved with an adapter assembly, one end of the adapter assembly near the outer opening of the groove is rotatably provided with a load-bearing rod installed on the outer side of the ladder frame near the top through a bearing, the top of the screw rod passes through the partition and is rotatably connected to the top of the inner wall of the groove through a bearing, a worm gear is fixedly sleeved on the surface of the screw rod near the top, the worm gear is located above the partition, a connecting groove is provided on the side of the groove near the top, the connecting groove is located on the inner side of the elongated steel frame, and the depth of the connecting groove is consistent with the depth inside the groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This integrated ladder is installed in a split configuration with the extended steel frame and the mounting frame, thereby reducing the amount of welding between the ladder and the ship's cabin during installation. Furthermore, by providing an anti-fall component and installing it on the side of the extended steel frame, it is unnecessary to weld the anti-fall railing again, thus avoiding the need for later repair welding. This protects the paint of the ladder structure, and eliminates the need to worry about rust in blind spots caused by paint repair, thereby extending the service life of the ladder.

[0016] 2. This integrated ladder is composed of two linked components by separating the extended steel frame from the ladder frame. During use, the inclination of the ladder frame can be adjusted by controlling the top control component or the bottom control component, making the ladder more convenient for crew members to climb. At the same time, since the original 90-degree vertical ladder is changed to an adjustable inclination, the crew will not fall back during the climbing process, which increases the safety of the crew when using the ladder. Moreover, after solving the problem of falling back, the crew can bear the weight of larger objects to a certain extent, which is convenient for the crew to carry items, thereby increasing the practicality of the ladder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the side sectional structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the local lifting component of the present invention;

[0020] Figure 4 This is a schematic diagram of the top control assembly structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the bottom control assembly structure of the present invention;

[0022] Figure 6 This is a schematic structural diagram of the anti-fall assembly of the present invention;

[0023] Figure 7 This is a schematic diagram of the expanded structure of the anti-fall component of the present invention.

[0024] In the figure: 1. Extended steel frame; 2. Mounting frame; 3. Connecting rod; 4. Ladder frame; 5. Anti-fall assembly; 51. Anti-fall frame; 52. Mounting plate; 53. Hinge; 54. Anti-fall cover; 55. Protective rod; 6. Ladder; 7. Top control assembly; 71. First shaft; 72. First moving wheel; 73. Scroll; 74. First crank handle; 8. Bottom control assembly; 81. Second shaft; 82. Second moving wheel; 83. Coupling assembly; 831. Fixed block; 832. Plastic pad; 84. Second crank handle; 9. Lifting assembly; 91. Groove; 92. Partition; 93. Screw; 94. Worm wheel; 95. Connecting slot; 96. Adapter assembly. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-7 , an integrated straight ladder, including: an extended steel frame 1, the extended steel frame 1 is a strip steel plate that passes through a multi-layer large cabin to open a passage, a plurality of mounting brackets 2 are evenly installed on the surface of the extended steel frame 1 by bolts, one end of the mounting bracket 2 is provided with a circular plate-shaped support foot, the mounting bracket 2 is attached to and welded to the side wall of the cabin through the circular plate-shaped support foot, a connecting rod 3 is rotatably provided at the inner wall near the bottom of the extended steel frame 1, a ladder frame 4 is provided on the side of the connecting rod 3 away from one end of the extended steel frame 1 through a rotating shaft, and an anti-fall component 5 is fixed on the surface of the extended steel frame 1 by bolts The number of anti-fall components 5 corresponds to the number of large cabin floors. The anti-fall components 5 are located at the upper and lower passages of each large cabin. A lifting component 9 is provided on the inner wall of the elongated steel frame 1. The internal structure of the lifting component 9 is connected to the side wall of the ladder frame 4 near the top in a linkage rotation manner. A top control component 7 is provided on the inner wall of the elongated steel frame 1 near the top of the lifting component 9 through a bearing rotation. The top control component 7 and the lifting component 9 are linked when rotating. A bottom control component 8 is provided on the surface near the bottom of the elongated steel frame 1, and the bottom control component 8 and the top control component 7 are linked when rotating.

[0027] Among them; a plurality of steps 6 arranged in a stepped manner are fixedly installed on the inner wall of the ladder frame 4, each step 6 is two steel pipes arranged side by side, and the steel pipe in the step 6 close to the back of the ladder frame 4 is located at the center line of the ladder frame 4 from top to bottom. The steps 6 are set near the front of the ladder frame 4, which is convenient for the crew to step directly after the ladder frame 4 is adjusted, and it can also avoid the steps 6 from affecting the linkage of the top control component 7 and the bottom control component 8 during the adjustment process of the ladder frame 4.

[0028] Among them; the anti-fall component 5 includes an anti-fall frame 51, and both ends of the anti-fall frame 51 are welded with mounting plates 52. The anti-fall component 5 is installed on the side of the elongated steel frame 1 through the mounting plate 52. The surface of the anti-fall frame 51 is fixedly sleeved with a hinge 53, and an anti-fall cover 54 is rotatably provided above the anti-fall frame 51 through the hinge 53. The anti-fall cover 54 is a steel bar welded in a quadrilateral closed loop, and the quadrilateral corners of the anti-fall cover 54 are set as arc-shaped chamfers. The inner wall of the anti-fall cover 54 is evenly welded with a number of protective rods 55. The anti-fall component 5 itself has a simple structure and is easy to use. There is no need for welding to damage the structural paint of the passage ladder and the ship's large cabin. At the same time, when closed, it can also cover the cutting openings of the upper and lower connecting passages between the ship's large cabins, thereby increasing the passage space in the ship's large cabin.

[0029] Among them, three sides of the quadrilateral of the anti-fall cover 54 overlap with the anti-fall frame 51 and are overlapped above the anti-fall frame 51. Two of the several protective rods 55 welded to the inside of the anti-fall cover 54 pass through the anti-fall cover 54 and overlap with the surface of the anti-fall frame 51 near one end of the mounting plate 52. The size of the anti-fall frame 51 corresponds to the size of the incision of the upper and lower connecting passages between the ship's main cabins. The anti-fall frame 51 is placed at the incision of the ship's main cabin, and at the same time, the anti-fall cover 54 can have sufficient load-bearing capacity. The two protective rods 55 and the anti-fall frame 51 that pass through the anti-fall cover 54 are used to make the four sides of the anti-fall cover 54 have support parts, which are sufficient to withstand the trampling of the crew when passing by.

[0030] Among them; the top control component 7 includes a first shaft rod 71, the middle part of the first shaft rod 71 is fixedly sleeved with a first moving wheel 72, the first moving wheel 72 is connected to the bottom control component 8 through a belt, the surface of the first shaft rod 71 near both ends is fixedly sleeved with a scroll 73, the first shaft rod 71 is linked with the lifting component 9 through the scroll 73, one end of the first shaft rod 71 passes through the elongated steel frame 1 and is fixedly installed with a first crank handle 74 for controlling the rotation of the top control component 7, by manually controlling the rotation of the top control component 7, the lifting component 9 is rotated accordingly, and then the lifting and lowering of the top of the ladder frame 4 is controlled, so that the ladder frame 4 is tilted under the support of the connecting rod 3, so as to facilitate the passage of the crew.

[0031] Among them; the top control component 7 is located behind the center line of the elongated steel frame 1 from top to bottom, and the outer edge of the first moving wheel 72 does not exceed the center line of the elongated steel frame 1 from top to bottom. The first moving wheel 72 is linked with the bottom control component 8 so that the crew members on the upper and lower layers can control the inclination of the ladder frame 4, which is convenient for the crew members to use. At the same time, the range position of the outer edge of the first moving wheel 72 is set so that the belt will not rub against the steps 6 on the ladder frame 4 during the linkage between the first moving wheel 72 and the bottom control component 8.

[0032] Among them; the bottom control component 8 includes a second shaft rod 81, and the middle part of the second shaft rod 81 is fixedly sleeved with a second moving wheel 82, and the second moving wheel 82 is connected to the top control component 7 through a belt. The surfaces of the second shaft rod 81 near both ends are rotatably sleeved with a coupling component 83 through bearings, and the coupling component 83 is fixedly installed on the inner side of the elongated steel frame 1. One end of the second shaft rod 81 passes through the elongated steel frame 1 and is fixedly installed with a second crank handle 84 for controlling the rotation of the bottom control component 8. By setting the bottom control component 8, the crew members located in the lower level of the ship's cabin can also control the tilt of the ladder frame 4 by the rotation of the bottom control component 8. At the same time, since the bottom control component 8 is located behind the elongated steel frame 1, the belt linking the top control component 7 and the bottom control component 8 is further pulled backward, thereby avoiding interference between the ladder frame 4 and the control structure.

[0033] Among them; the coupling assembly 83 includes a fixed block 831, and the fixed block 831 is a square block-shaped fixed steel structure part. One end of the fixed block 831 protrudes from the rear of the elongated steel frame 1 and is used to rotate the second shaft 81. The other end of the fixed block 831 is located behind the center line of the elongated steel frame 1 from top to bottom, and the end of the fixed block 831 close to the center line of the elongated steel frame 1 is fixedly installed with a plastic pad 832. The plastic pad 832 is located in the middle of the connecting rod 3 after it swings vertically. The plastic pad 832 is used to limit the swing range of the connecting rod 3. At the same time, the plastic pad 832 can slightly push the top end of the connecting rod 3 to tilt forward after it is vertical, so that the ladder frame 4 automatically swings forward under the influence of gravity during the control of the tilt, avoiding the situation where the connecting rod 3 swings backward and the ladder frame 4 cannot be unfolded.

[0034] Among them, the lifting component 9 includes a groove 91. A quadrilateral convex ring strip is welded to the outer edge of the groove 91 near the outer opening. A partition 92 is arranged on the inner wall of the groove 91 near the top. The bottom of the inner wall of the groove 91 is rotatably connected to a lead screw 93 through a bearing. A transfer component 96 is threadedly sleeved on the surface of the lead screw 93. One end of the transfer component 96 near the outer opening of the groove 91 is rotatably arranged through a bearing with a load-bearing rod installed on the outer side of the ladder frame 4 near the top. The top of the lead screw 93 penetrates through the partition 92 and is rotatably connected to the top of the inner wall of the groove 91 through a bearing. A worm gear 94 is fixedly sleeved on the surface of the lead screw 93 near the top. The worm gear 94 is located above the partition 92. A joint installation groove 95 is opened on the side of the groove 91 near the top. The joint installation groove 95 is located inside the lengthened steel frame 1, and the depth of the joint installation groove 95 is the same as the depth inside the groove 91. By controlling the rotation of the top control component 7 or the bottom control component 8, the lifting component 9 drives the ladder frame 4 to tilt, achieving the purpose of controlling the unfolding or folding and retraction of the ladder frame 4. At the same time, by using the meshing connection between the worm gear 94 and the top control component 7, the top control component 7 can unidirectionally control the rotation degree of the lifting component 9, avoiding the situation that the ladder frame 4 tilts and unfolds due to the influence of gravity on the lifting component 9.

[0035] Working principle: When using the through-pass straight ladder to shuttle between the upper and lower cabins of the ship, first, manually lift the anti-falling cover 54 of the anti-falling component 5. Then, rotate the first crank 74 or the second crank 84 respectively according to the self-demand of going down or up, so that the spiral tube 73 rotates to drive the worm gear 94 on the lifting component 9. Then, use the movement of the transfer component 96 to control the position of the ladder frame 4. At this time, the gravity and position of the ladder frame 4 itself will further affect the swing of the connecting rod 3 during the movement, thereby making the ladder frame 4 tilt. After the bottom of the ladder frame 4 contacts the bottom of the cabin, the crew can carry items to enter the upper cabin from the lower cabin or from top to bottom, and then close the anti-falling cover 54 conveniently. After the crew passes through, control the first crank 74 or the second crank 84 to fold the ladder frame 4 back.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. One-piece straight ladder, characterized in that, Including: An extended steel frame (1), the extended steel frame (1) being a strip-shaped steel plate passing through channels opened in multiple large cabins. A plurality of mounting brackets (2) are evenly installed on the surface of the extended steel frame (1) by bolts. One end of the mounting bracket (2) is provided with a circular plate-shaped support leg. The mounting bracket (2) is attached to and welded to the side wall of the cabin through the circular plate-shaped support leg. A connecting rod (3) is rotatably arranged at the inner wall of the extended steel frame (1) near the bottom. A ladder frame (4) is arranged on the side of the connecting rod (3) away from the extended steel frame (1) through a rotating shaft. An anti-falling component (5) is fixedly installed on the surface of the extended steel frame (1) by bolts. The number of the anti-falling components (5) corresponds to the number of layers of the large cabin. The anti-falling components (5) are located at the reserved upper and lower channels of each layer of the large cabin. A lifting component (9) is arranged at the inner wall of the extended steel frame (1). The internal structure of the lifting component (9) is linked and rotatably connected to the side wall near the top of the ladder frame (4). A top control component (7) is rotatably arranged at the inner wall of the extended steel frame (1) near the top of the lifting component (9) through a bearing. The top control component (7) is linked during rotation with the lifting component (9). A bottom control component (8) is arranged on the surface of the extended steel frame (1) near the bottom. The bottom control component (8) is linked during rotation with the top control component (7). The anti-falling component (5) includes an anti-falling frame (51). Installation plates (52) are welded to both ends of the anti-falling frame (51). The anti-falling component (5) is installed on the side of the extended steel frame (1) through the installation plates (52). A hinge member (53) is fixedly sleeved on the surface of the anti-falling frame (51). An anti-falling cover (54) is rotatably arranged above the anti-falling frame (51) through the hinge member (53). The anti-falling cover (54) is a steel bar welded in a quadrilateral closed loop, and the corners of the quadrilateral of the anti-falling cover (54) are set as rounded chamfers. A number of protective rods (55) are evenly welded and arranged on the inner wall of the anti-falling cover (54). Three sides of the quadrilateral of the anti-falling cover (54) coincide with the anti-falling frame (51) and overlap above the anti-falling frame (51). Two of the number of protective rods (55) welded inside the anti-falling cover (54) penetrate through the anti-falling cover (54) and overlap with the surface of the anti-falling frame (51) near one end of the installation plate (52).

2. The one-piece straight ladder according to claim 1, characterized in that, A number of ladder steps (6) arranged in a stepped manner are fixedly installed on the inner wall of the ladder frame (4). Each ladder step (6) is two steel pipes arranged side by side, and the steel pipe of the ladder step (6) close to the back of the ladder frame (4) is located at the midline of the ladder frame (4) from top to bottom.

3. The integrated straight ladder according to claim 1, wherein, The top control assembly (7) includes a first shaft (71). A first driving wheel (72) is fixedly sleeved in the middle of the first shaft (71). The first driving wheel (72) is in transmission connection with the bottom control assembly (8) through a belt. Spiral tubes (73) are fixedly sleeved on the surfaces of the first shaft (71) near both ends. The first shaft (71) is linked with the lifting assembly (9) through the spiral tubes (73). One end of the first shaft (71) penetrates through the lengthened steel frame (1) and is fixedly installed with a first crank (74) for controlling the rotation of the top control assembly (7).

4. The integrated straight ladder according to claim 3, characterized in that The top control assembly (7) is located behind the vertical midline of the lengthened steel frame (1), and the outer edge of the first driving wheel (72) does not exceed the vertical midline of the lengthened steel frame (1).

5. The one-piece straight ladder according to claim 1, characterized in that, The bottom control assembly (8) includes a second shaft (81). A second driving wheel (82) is fixedly sleeved in the middle of the second shaft (81). The second driving wheel (82) is in transmission connection with the top control assembly (7) through a belt. Coupling assemblies (83) are rotatably sleeved on the surfaces of the second shaft (81) near both ends through bearings. The coupling assemblies (83) are fixedly installed on the inner side of the lengthened steel frame (1). One end of the second shaft (81) penetrates through the lengthened steel frame (1) and is fixedly installed with a second crank (84) for controlling the rotation of the bottom control assembly (8).

6. The one-piece straight ladder according to claim 5, characterized in that, The coupling assembly (83) includes a fixing block (831). The whole fixing block (831) is a square block-shaped steel structure part for fixing. One end of the fixing block (831) protrudes behind the lengthened steel frame (1) and is used for rotatably arranging the second shaft (81). The other end of the fixing block (831) is located behind the vertical midline of the lengthened steel frame (1), and a plastic pad (832) is fixedly installed at the end of the fixing block (831) near the midline of the lengthened steel frame (1).

7. The one-piece straight ladder according to claim 1, characterized in that, The lifting assembly (9) includes a groove (91). A quadrilateral convex ring strip is welded on the outer edge of the groove (91) near the outer opening. A partition (92) is arranged on the inner wall of the groove (91) near the top. A lead screw (93) is rotatably connected to the bottom of the inner wall of the groove (91) through a bearing. A transfer assembly (96) is threadedly sleeved on the surface of the lead screw (93). One end of the transfer assembly (96) near the outer opening of the groove (91) is rotatably arranged with a load-bearing rod installed on the outer side near the top of the ladder frame (4). The top of the lead screw (93) penetrates through the partition (92) and is rotatably connected to the top of the inner wall of the groove (91) through a bearing. A worm gear (94) is fixedly sleeved on the surface of the lead screw (93) near the top. The worm gear (94) is located above the partition (92). An assembly groove (95) is opened on the side of the groove (91) near the top. The assembly groove (95) is located on the inner side of the lengthened steel frame (1), and the depth of the assembly groove (95) is the same as the depth inside the groove (91).

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