Multi-lifting-point portal crane

Abstract

The invention discloses a multi-lifting-point portal crane, and relates to the technical field of portal cranes. The device comprises a connecting block, and an adjusting mechanism is arranged below the connecting block. Goods to be hoisted are placed through the hoisting plate, after the goods are all placed on the upper surface of the hoisting plate, due to the fact that the weights of the goods on the two sides of the bearing plate are not completely the same, the gravity center of the hoisting plate at the moment is not located at the center point, the hoisting plate inclines, and the rotating ball deflects in the bearing plate through inclination of the hoisting plate; the movable pulley is driven to rotate through the lifting rope during lifting, the second gear rotates along with the movable pulley, the problem of rollover of the crane during lifting is effectively solved through the arrangement of the assembly, and the effect of adjusting the gravity center of goods can be achieved; and meanwhile, the safety of the crane during hoisting is improved, and goods are prevented from toppling over due to crosswind encountered in the hoisting process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gantry cranes, in particular to a multi-lifting-point gantry crane. BACKGROUND

[0002] The port container gantry crane is one of the core handling equipment in modern container terminals, and its main function is to complete the efficient transfer of containers between ships and terminals. The multi-lifting-point gantry crane is a widely used lifting equipment in port, warehouse, steel and other large industrial fields. Compared with the traditional single-lifting-point crane, the multi-lifting-point gantry crane is optimized in structure, usually adopts multiple lifting points to realize uniform distribution of load, avoiding the unbalanced load and instability phenomenon that may occur in single-point lifting. The core technology of multi-lifting-point design lies in how to ensure the synchronization and coordination of multiple lifting points during work, avoiding load imbalance between different lifting points. In order to ensure the stability of the crane, the strength of the material, the rigidity of the structure and the inertia force that may occur during lifting should be fully considered in the structural design.

[0003] In Chinese patent (publication number: CN117401584B), a multi-point lifting type portal crane is disclosed. The device ensures stability during lifting by the overturning of the clamping locking plate inside the moving base under the bearing beam body, and by the cooperation of the lifting platform and the lifting overturning plate, the lifting of the goods after lifting is realized, preventing the bearing beam body from being stressed too much to affect the stability of the structure. However, in the actual use process of the device, the center of gravity of the goods cannot be adjusted during lifting, which may cause the goods to tilt during lifting, cannot reasonably ensure the stable lifting of the goods, and also reduces the safety of the lifting site. At the same time, the device cannot cope with crosswind during lifting, reducing the versatility of the crane during use. SUMMARY

[0004] The purpose of the present application is to solve the above problems, and the present application provides a multi-lifting-point gantry crane.

[0005] In order to achieve the above purpose, the present application specifically adopts the following technical scheme: A multi-lifting-point gantry crane, comprising a connecting block, an adjusting mechanism is arranged below the connecting block, the adjusting mechanism comprises a baffle, a lifting plate, an adjusting rod, a rotating ball, a receiving plate, a rack, a bottom plate, a gear two, a toothed plate and an outer frame, the lifting plate is fixedly connected with the baffle, the lifting plate is fixedly connected with the receiving plate, the rotating ball is rotatably connected with the receiving plate, the adjusting rod is fixedly connected with the rotating ball, the adjusting rod is fixedly connected with the rack, the rack is fixedly connected with the toothed plate, the bottom plate is slidably inserted with the rack, the bottom plate is fixedly connected with the outer frame, and the gear two is rotatably connected with the outer frame.

[0006] Further, the inside of the connecting block is provided with a hoisting mechanism, the hoisting mechanism comprises a driving motor, a fixed plate one, a fixed pulley one, a spool one, a spool two, a hoisting rope, a fixed pulley two, a fixed plate two and a receiving block, the driving motor is fixedly connected with the fixed plate one, the output shaft of the driving motor is fixedly connected with the spool one, the spool one is rotationally connected with the fixed plate one, the spool one is fixedly connected with the spool two, the fixed plate two is fixedly connected with the spool two, the receiving block is fixedly connected with the fixed plate two, the fixed plate two is rotationally connected with the fixed pulley one, the receiving block is rotationally connected with the fixed pulley two, one end of the hoisting rope is fixedly connected with the spool one, the other end of the hoisting rope is fixedly connected with the spool two, the hoisting rope is attached with the fixed pulley one, and the hoisting rope is attached with the fixed pulley two.

[0007] Further, the inside of the connecting block is provided with a hoisting mechanism, the hoisting mechanism comprises a driving motor, a fixed plate one, a fixed pulley one, a spool one, a spool two, a hoisting rope, a fixed pulley two, a fixed plate two and a receiving block, the driving motor is fixedly connected with the fixed plate one, the output shaft of the driving motor is fixedly connected with the spool one, the spool one is rotationally connected with the fixed plate one, the spool one is fixedly connected with the spool two, the fixed plate two is fixedly connected with the spool two, the receiving block is fixedly connected with the fixed plate two, the fixed plate two is rotationally connected with the fixed pulley one, the receiving block is rotationally connected with the fixed pulley two, one end of the hoisting rope is fixedly connected with the spool one, the other end of the hoisting rope is fixedly connected with the spool two, the hoisting rope is attached with the fixed pulley one, and the hoisting rope is attached with the fixed pulley two.

[0008] Further, the two sides of the outer frame are fixedly installed with hooks, the surface of the hooks is attached with a hanging rope, and the hanging rope is fixedly connected with the baffle.

[0009] Further, the upper surface of the connecting block is fixedly connected with a connecting plate, the upper surface of the connecting plate is fixedly connected with a limiting block, the two sides of the limiting block are attached with a top plate, the top plate is fixedly connected with the connecting plate, the inner wall of the limiting block is slidably connected with a sliding block, the upper surface of the sliding block is fixedly connected with an adjusting block, the adjusting block is slidably connected with the limiting block, and the inside of the limiting block is provided with a reserved groove.

[0010] Further, the side of the adjusting block is fixedly installed with a servo motor, the output shaft of the servo motor is fixedly connected with a rotating shaft two, the rotating shaft two is rotationally connected with the adjusting block, the surface of the rotating shaft two is attached with two groups of belts, and the surface of the two groups of belts is attached with a rotating shaft one.

[0011] Further, one end of the rotating shaft one is fixedly connected with a rotating rod, the other end of the rotating rod is fixedly connected with a gear one, the rotating shaft one is rotationally connected with the adjusting block, the rotating rod is fixedly connected with the adjusting block, the upper surface of the limiting block is fixedly installed with a gear slot, and the gear slot is engaged with the gear one.

[0012] Further, the lower surface of the sliding block is fixedly connected with two groups of connecting rods, and the lower ends of the two groups of connecting rods are fixedly connected with the fixed plate one.

[0013] Further, the lower surface of the connecting block is fixedly provided with two groups of struts, the lower ends of the two groups of struts are fixedly connected with bases, the upper surfaces of the bases are fixedly connected with two groups of second backing plates, the upper surfaces of the two groups of second backing plates are fixedly connected with reinforcing plates, the upper end of the reinforcing plate is fixedly connected with a first backing plate, and the first backing plate is fixedly connected with the struts.

[0014] Further, the lower surface of the base is rotatably connected with two groups of universal wheels, the two groups of universal wheels are located on the same horizontal plane, the inside of the base is threadedly connected with two groups of screw rods, the lower ends of the two groups of screw rods are fixedly provided with fixed blocks, the upper ends of the screw rods are fixedly provided with handles, and the inside of the base is provided with two groups of reserved holes, and the inner walls of the two groups of reserved holes are matched with the screw rods.

[0015] The beneficial effects of the present application are as follows: The goods to be hoisted are placed on the lifting plate, and after the goods are placed on the upper surface of the lifting plate, the center of gravity of the lifting plate is not at the center point due to the different weights of the goods on both sides of the receiving plate, so that the lifting plate is inclined. The inclination of the lifting plate causes the rotating ball to deflect inside the receiving plate, causing the adjusting rod and the rack on the side with lower weight to move vertically upward. When lifting, the lifting rope drives the movable pulley to rotate, causing the gear two to rotate with the movable pulley. When the tooth plate and the gear two are in the same horizontal plane, the rotation of the gear two causes the tooth plate to move vertically downward, and the adjusting rod and the rack on the side with lower weight move vertically downward, thereby adjusting the inclination of the lifting plate, thereby avoiding the side turning of the goods during hoisting. The arrangement of the assembly effectively avoids the problem of side turning of the crane during hoisting, and can achieve the effect of adjusting the center of gravity of the goods. At the same time, the safety of the crane during hoisting is improved, and the horizontal wind encountered during hoisting is also avoided.

[0016] The driving motor drives the spool one and the spool two to rotate, and the diameters of the spool one and the spool two are different, so that the lengths of the wire wound on the spool one and the spool two are different. When lifting the goods, the spool one is wound while the spool two is unwound, so that the lifting rope drives the movable pulley and the outer frame to lift, and the lifting plate and the goods on it are lifted. The arrangement of the assembly effectively avoids the problem of unstable hoisting of the goods, and can achieve the effect of constant-speed hoisting of the goods. At the same time, the working efficiency of the crane is improved, and the lifting power consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present application; Figure 2 is a schematic diagram of the overall structure of the present application Figure 1 is a schematic diagram of the overall structure of the present application Figure 3 is the present invention Figure 1 schematic diagram of the overall structure from the top view; Figure 4 is the present invention Figure 3 schematic diagram of the partial structure from the left view; Figure 5 is the present invention Figure 4 schematic diagram of the internal structure from the top view; Figure 6 is the present invention Figure 5 schematic diagram of the partial structure from the front view; Figure 7 is the present invention Figure 6 schematic diagram of the overall structure from the back view; Figure 8 is the present invention Figure 1 schematic diagram of the partial structure from the front view; Figure 9 is the present invention Figure 8 schematic diagram of the partial structure from the front view.

[0018] Fig. 1, connecting block; 11, support column; 12, reinforcing plate; 13, universal wheel; 14, base; 15, pad plate one; 16, pad plate two; 17, screw rod; 18, handle; 19, fixed block; 110, reserved hole; 111, connecting plate; 112, driven block; 113, telescopic rod; 2, limiting block; 21, reserved groove; 22, adjusting block; 23, sliding block; 24, gear one; 25, gear slot; 26, top plate; 27, rotating rod; 28, rotating shaft one; 29, servo motor; 210, rotating shaft two; 211, belt; 212, connecting rod; 3, hoisting mechanism; 31, drive motor; 32, fixed plate one; 33, fixed pulley one; 34, spool one; 35, spool two; 36, hoisting rope; 37, fixed pulley two; 38, fixed plate two; 39, receiving block; 4, adjusting mechanism; 41, baffle; 42, hanging plate; 43, adjusting rod; 44, rotating ball; 45, receiving plate; 46, hanging rope; 47, outer frame; 48, hook; 49, movable pulley; 410, gear two; 411, toothed plate; 412, rack; 413, bottom plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0020] Embodiment one, as Figures 1-9As shown, a multi-suspension-point gantry crane includes a connecting block 1, an adjusting mechanism 4 is arranged below the connecting block 1, the adjusting mechanism 4 includes a baffle plate 41, a lifting plate 42, an adjusting rod 43, a rotating ball 44, a receiving plate 45, a rack 412, a bottom plate 413, a gear two 410, a toothed plate 411 and an outer frame 47, the lifting plate 42 is fixedly connected with the baffle plate 41, the lifting plate 42 is fixedly connected with the receiving plate 45, the rotating ball 44 is rotatably connected with the receiving plate 45, the adjusting rod 43 is fixedly connected with the rotating ball 44, the adjusting rod 43 is fixedly connected with the rack 412, the rack 412 is fixedly connected with the toothed plate 411, the bottom plate 413 is slidably inserted with the rack 412, the bottom plate 413 is fixedly connected with the outer frame 47, and the gear two 410 is rotatably connected with the outer frame 47.

[0021] When the crane hoists the goods, the center of gravity of the goods cannot be guaranteed to be at the center due to the different weights of the goods on both sides, so that tilting and side turning occur in the hoisting process. When the center of gravity of the goods is adjusted, the goods to be hoisted are placed on the lifting plate 42, and after the goods are placed on the upper surface of the lifting plate 42, the center of gravity of the lifting plate 42 is not at the center point due to the different weights of the goods on both sides of the receiving plate 45, so that the lifting plate 42 tilts, the rotating ball 44 is deflected in the receiving plate 45 due to the tilting of the lifting plate 42, the adjusting rod 43 and the rack 412 on the side with low weight vertically move upward, when lifting, the movable pulley 49 is rotated by the hoisting rope 36, the gear two 410 is rotated with the movable pulley 49, when the toothed plate 411 and the gear two 410 are in the same horizontal plane, the toothed plate 411 vertically moves downward by the rotation of the gear two 410, and then the adjusting rod 43 and the rack 412 on the side with low weight vertically move downward, so that the tilting of the lifting plate 42 is adjusted, and then side turning of the goods during hoisting is avoided.

[0022] Embodiment two, as Figures 6-8As shown, on the basis of the above embodiment, further comprising, the inside of the connecting block 1 is provided with a lifting mechanism 3, the lifting mechanism 3 includes driving motor 31, fixed plate one 32, fixed pulley one 33, spool one 34, spool two 35, lifting rope 36, fixed pulley two 37, fixed plate two 38 and receiving block 39, the driving motor 31 is fixedly connected with the fixed plate one 32, the output shaft of the driving motor 31 is fixedly connected with the spool one 34, the spool one 34 is rotatably connected with the fixed plate one 32, the spool one 34 is fixedly connected with the spool two 35, the fixed plate two 38 is fixedly connected with the spool two 35, the receiving block 39 is fixedly connected with the fixed plate two 38, the fixed plate two 38 is rotatably connected with the fixed pulley one 33, the receiving block 39 is rotatably connected with the fixed pulley two 37, one end of the lifting rope 36 is fixedly connected with the spool one 34, the other end of the lifting rope 36 is fixedly connected with the spool two 35, the lifting rope 36 is in contact with the fixed pulley one 33, the lifting rope 36 is in contact with the fixed pulley two 37, the inside of the outer frame 47 is rotatably connected with the movable pulley 49, the movable pulley 49 is fixedly connected with the gear two 410, the movable pulley 49 is in contact with the lifting rope 36, the upper surface of the outer frame 47 is fixedly installed with the telescopic rod 113, the upper surface of the telescopic rod 113 is fixedly connected with the driven block 112, the driven block 112 is slidably connected with the connecting block 1, both sides of the outer frame 47 are fixedly installed with the hook 48, the surface of the hook 48 is in contact with the hanging rope 46, the hanging rope 46 is fixedly connected with the baffle 41, when lifting the goods, the spool one 34 and the spool two 35 are driven to rotate by the driving motor 31, because the diameters of the spool one 34 and the spool two 35 are different, the lengths of the wire collected and released by the spool one 34 and the spool two 35 are different, when lifting the goods, the spool one 34 is wound while the spool two 35 is released, so that the movable pulley 49 and the outer frame 47 are lifted by the lifting rope 36, so that the hook 48 and the hanging rope 46 drive the hanging plate 42 and the goods on it to be lifted with the outer frame 47.

[0023] In the third embodiment, as Figures 3-5As shown, based on the above embodiment, it further includes: a connecting plate 111 fixedly connected to the upper surface of the connecting block 1; a limiting block 2 fixedly connected to the upper surface of the connecting plate 111; a top plate 26 attached to both sides of the limiting block 2; the top plate 26 fixedly connected to the connecting plate 111; a slider 23 slidably connected to the inner wall of the limiting block 2; an adjusting block 22 fixedly connected to the upper surface of the slider 23; the adjusting block 22 slidably connected to the limiting block 2; a reserved groove 21 opened inside the limiting block 2; a servo motor 29 fixedly installed on one side of the adjusting block 22; a rotating shaft 210 fixedly connected to the output shaft of the servo motor 29; the rotating shaft 210 rotatably connected to the adjusting block 22; two sets of belts 211 attached to the surface of the rotating shaft 210; a rotating shaft 28 attached to the surface of both sets of belts 211; a rotating rod 27 fixedly connected to one end of the rotating shaft 28; and a gear 24 fixedly connected to the other end of the rotating rod 27. 28 is rotatably connected to the adjusting block 22, and the rotating rod 27 is fixedly connected to the adjusting block 22. The upper surface of the limiting block 2 is fixedly installed with a toothed groove 25, which meshes with the gear 24. The lower surface of the slider 23 is fixedly connected with two sets of connecting rods 212, and the lower ends of the two sets of connecting rods 212 are fixedly connected to the fixing plate 32. The servo motor 29 drives the rotating shaft 210 to rotate, so that the belt 211 attached to the surface of the rotating shaft 210 moves with the rotating shaft 210, thereby driving the rotating shaft 28, the rotating rod 27 and the gear 24 to rotate, so that the slider 23 and the adjusting block 22 move horizontally along the inner wall of the limiting block 2. The gear 24 is limited by the toothed groove 25 fixedly connected to the upper surface of the limiting block 2, so as to prevent the slider 23 from shifting when the servo motor 29 stops working, which improves the stability of the crane's lifting point position adjustment, and can also adjust the lifting point to different positions according to the lifting requirements.

[0024] Example 4, as Figure 1 As shown, based on the above embodiment, it further includes two sets of support columns 11 fixedly installed on the lower surface of the connecting block 1. The lower ends of the two sets of support columns 11 are fixedly connected to the base 14. The upper surface of the base 14 is fixedly connected to two sets of pads 16. The upper surfaces of the two sets of pads 16 are fixedly connected to the reinforcing plates 12. The upper end of the reinforcing plate 12 is fixedly connected to the pad 15. The pad 15 is fixedly connected to the support column 11. The support column 11 is reinforced by the reinforcing plate 12, the pad 15 and the pad 16. The triangular structure formed by the reinforcing plate 12 and the support column 11 prevents damage when the crane lifts goods and improves the service life of the crane.

[0025] Example 5, such as Figure 1 , Figure 2As shown, on the basis of the above embodiment, further comprising, the lower surface of the base 14 is rotatably connected with two groups of universal wheels 13, two groups of universal wheels 13 are located in the same horizontal plane, the inside of the base 14 is threadedly connected with two groups of screw rods 17, the lower end of two groups of screw rods 17 is fixedly installed with fixed blocks 19, the upper end of the screw rod 17 is fixedly installed with a handle 18, the inside of the base 14 is provided with two groups of reserved holes 110, the inner wall of two groups of reserved holes 110 is combined with the screw rod 17, through four groups of universal wheels 13, the position of the crane is conveniently moved, when moving to the specified position, rotating the handle 18 drives the screw rod 17 to rotate, so that the screw rod 17 moves vertically downward along the inner wall of the reserved hole 110, so that the fixed block 19 is closely combined with the ground, so as to fix the position of the crane through the fixed block 19, avoid its deviation.

[0026] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-point portal crane comprising a connection block (1), characterized in that, The lower part of the connecting block (1) is provided with an adjusting mechanism (4), the adjusting mechanism (4) comprises a baffle (41), a hanging plate (42), an adjusting rod (43), a rotating ball (44), a receiving plate (45), a rack (412), a bottom plate (413), a gear two (410), a toothed plate (411) and an outer frame (47), the hanging plate (42) is fixedly connected with the baffle (41), the hanging plate (42) is fixedly connected with the receiving plate (45), the rotating ball (44) is rotatably connected with the receiving plate (45), the adjusting rod (43) is fixedly connected with the rotating ball (44), the adjusting rod (43) is fixedly connected with the rack (412), the rack (412) is fixedly connected with the toothed plate (411), the bottom plate (413) is slidably connected with the rack (412), the bottom plate (413) is fixedly connected with the outer frame (47), and the gear two (410) is rotatably connected with the outer frame (47).

2. A multi-point portal crane according to claim 1, characterized in that The inside of the connecting block (1) is provided with a hoisting mechanism (3), the hoisting mechanism (3) comprises a driving motor (31), a fixed plate one (32), a fixed pulley one (33), a spool one (34), a spool two (35), a hoisting rope (36), a fixed pulley two (37), a fixed plate two (38) and a receiving block (39), the driving motor (31) is fixedly connected with the fixed plate one (32), the output shaft of the driving motor (31) is fixedly connected with the spool one (34), the spool one (34) is rotatably connected with the fixed plate one (32), the spool one (34) is fixedly connected with the spool two (35), the fixed plate two (38) is fixedly connected with the spool two (35), the receiving block (39) is fixedly connected with the fixed plate two (38), the fixed plate two (38) is rotatably connected with the fixed pulley one (33), the receiving block (39) is rotatably connected with the fixed pulley two (37), one end of the hoisting rope (36) is fixedly connected with the spool one (34), the other end of the hoisting rope (36) is fixedly connected with the spool two (35), the hoisting rope (36) is attached to the fixed pulley one (33), and the hoisting rope (36) is attached to the fixed pulley two (37).

3. A multi-point portal crane according to claim 1, characterized in that, The inside of the outer frame (47) is rotatably connected with a movable pulley (49), the movable pulley (49) is fixedly connected with the gear two (410), the movable pulley (49) is attached to the hoisting rope (36), the upper surface of the outer frame (47) is fixedly connected with a telescopic rod (113), the upper surface of the telescopic rod (113) is fixedly connected with a driven block (112), the driven block (112) is slidably connected with the connecting block (1).

4. A multi-point portal crane according to claim 1, characterized in that, Hooks (48) are fixedly installed on the two sides of the outer frame (47), the surface of the hook (48) is attached with a hanging rope (46), and the hanging rope (46) is fixedly connected with the baffle (41).

5. A multi-point portal crane according to claim 1, characterized in that, The upper surface of the connecting block (1) is fixedly connected with a connecting plate (111), the upper surface of the connecting plate (111) is fixedly connected with a limiting block (2), both sides of the limiting block (2) are attached with a top plate (26), the top plate (26) is fixedly connected with the connecting plate (111), the inner wall of the limiting block (2) is slidably connected with a sliding block (23), the upper surface of the sliding block (23) is fixedly connected with an adjusting block (22), the adjusting block (22) is slidably connected with the limiting block (2), and the inside of the limiting block (2) is provided with a reserved groove (21).

6. A multi-point portal crane according to claim 5, characterised in that, One side of the adjusting block (22) is fixedly installed with a servo motor (29), the output shaft of the servo motor (29) is fixedly connected with a rotating shaft two (210), the rotating shaft two (210) is rotatably connected with the adjusting block (22), and the surface of the rotating shaft two (210) is attached with two groups of belts (211), and the surfaces of the two groups of belts (211) are attached with a rotating shaft one (28).

7. A multi-point portal crane according to claim 6, characterized in that One end of the rotating shaft one (28) is fixedly connected with a rotating rod (27), the other end of the rotating rod (27) is fixedly connected with a gear one (24), the rotating shaft one (28) is rotatably connected with the adjusting block (22), the rotating rod (27) is fixedly connected with the adjusting block (22), the upper surface of the limiting block (2) is fixedly installed with a gear slot (25), and the gear slot (25) is engaged with the gear one (24).

8. A multi-point portal crane according to claim 5, characterized in that, The lower surface of the sliding block (23) is fixedly connected with two groups of connecting rods (212), and the lower ends of the two groups of connecting rods (212) are fixedly connected with a fixed plate one (32).

9. A multi-point portal crane according to claim 1, characterized in that, The lower surface of the connecting block (1) is fixedly installed with two groups of struts (11), the lower ends of the two groups of struts (11) are fixedly connected with a base (14), the upper surface of the base (14) is fixedly connected with two groups of backing plates two (16), the upper surfaces of the two groups of backing plates two (16) are fixedly connected with reinforcing plates (12), the upper end of the reinforcing plate (12) is fixedly connected with a backing plate one (15), and the backing plate one (15) is fixedly connected with the strut (11).

10. A multi-point portal crane according to claim 9, characterized in that The lower surface of the base (14) is rotatably connected with two groups of universal wheels (13), the two groups of universal wheels (13) are located on the same horizontal plane, the inside of the base (14) is threadedly connected with two groups of screw rods (17), the lower ends of the two groups of screw rods (17) are fixedly installed with fixed blocks (19), the upper ends of the screw rods (17) are fixedly installed with handles (18), and the inside of the base (14) is provided with two groups of reserved holes (110), and the inner walls of the two groups of reserved holes (110) are attached with the screw rods (17).

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