Bridge steel plate welding equipment facilitating feeding and discharging

Abstract

The invention relates to the technical field of bridge steel plate welding, and discloses bridge steel plate welding equipment facilitating feeding and discharging, feeding and discharging conveying mechanisms are arranged on welding table bodies, alignment mechanisms are arranged on the welding table bodies, and a sliding rail structure is arranged between the two welding table bodies; two sets of fixing mechanisms with lifting functions are arranged at the lower end of the sliding track structure, a welding mechanism is arranged on the inner side of the sliding track structure, a tensioning assembly is arranged on the upper portion of the welding mechanism, and a driving assembly is arranged on the connecting face of the welding mechanism and the track. According to the welding device, plates can be welded through the plasma welding gun, driving wheels in the driving assembly can enable the welding mechanism to move along the sliding rail structure, so that thick steel plates such as bridge steel plates are welded, the vertical position of the welding gun can be adjusted through the fixing mechanism and the lower rotating cylinder, and the welding effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge steel plate welding, and in particular to bridge steel plate welding equipment which is convenient for loading and unloading. Background Art

[0002] Plasma arc welding refers to a fusion welding method that uses the high energy density beam of a plasma arc as a welding heat source. Plasma arc welding has the advantages of concentrated energy, high productivity, fast welding speed, low stress and deformation, and stable arc. It is particularly suitable for welding various refractory, easily oxidized, and heat-sensitive metal materials. Plasma arc welding has significant technical advantages in the welding of bridge steel plates. Plasma arc welding is usually used to weld thicker plates in bridge steel plates.

[0003] After searching, the Chinese patent with the publication number CN222429730U discloses a plate welding device, which is provided with a moving component to move the plate and weld the plate by a welding gun. However, the following problems still exist:

[0004] 1. The welding gun is set above the plate, and can only weld one side of the plate. When double-sided welding is required, the plate needs to be turned over, which seriously affects the welding efficiency;

[0005] 2. The maximum load of the ball seat is low and is not suitable for supporting heavy plates such as bridge steel plates;

[0006] 3. When adjusting the two plates to be welded, there is a lack of indication of the welding points, which may cause misalignment during welding. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the present invention provides a bridge steel plate welding equipment that is easy to load and unload, mainly to solve the problem of inconvenience in double-sided welding of bridge steel plates.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A bridge steel plate welding equipment that is convenient for loading and unloading includes two groups of welding table bodies, the welding table bodies are provided with loading and unloading conveying mechanisms, and the welding table bodies are provided with a positioning mechanism for aligning the two groups of bridge steel plates to be welded, a sliding track structure is provided between the two groups of welding table bodies, and the lower end of the sliding track structure is provided with a fixing mechanism with a lifting function, and a welding mechanism is provided on the inner side of the sliding track structure, and the upper part of the welding mechanism is provided with a tensioning assembly that cooperates with the sliding track structure, and the welding mechanism is also provided with a driving assembly for driving the welding mechanism to slide along the sliding track structure.

[0010] As a further solution of the present invention, the loading and unloading conveying mechanism is composed of several groups of conveying rollers, and a guide surface is integrally formed at the edge of the welding table body, and several groups of mounting grooves are opened on the upper surface of the welding table body, and the mounting grooves are equidistantly distributed, and the conveying rollers are installed in the mounting grooves.

[0011] As a further solution of the present invention, four sets of alignment mechanisms are provided on each group of the welding table body, and the alignment mechanism includes a side plate and an alignment block. The side plate is welded to the welding table body, and a threaded seat is integrally formed on the side plate. A threaded rod is threadedly connected to the inner side of the threaded seat, and a knob with anti-slip grooves on the surface is welded to the outer end of the threaded rod. A bearing 1 is installed on one side of the alignment block, and the end of the welding table body away from the knob is fixedly inserted into the inner ring of the bearing 1.

[0012] As a further solution of the present invention, the sliding track structure includes a linear slide rail and an arc slide rail, the linear slide rail and the arc slide rail are integrally formed, and guide grooves are provided on the inner sides of the linear slide rail and the arc slide rail.

[0013] As a further solution of the present invention, the fixing mechanism includes two groups of symmetrically arranged bottom fixing seats, and two groups of symmetrical fixing holes are opened on the bottom fixing seats, and a cylinder is installed on the upper end of the bottom fixing seat by bolts, and the piston end of the cylinder and the linear slide rail are fixedly connected by bolts.

[0014] As a further solution of the present invention, the driving assembly includes a fixed block with rounded edges, and a through slot is provided on the fixed block, and a driving motor is installed inside the through slot by bolts, and the output shaft of the driving motor is fixedly connected to the driving wheel by a flat key, and an anti-slip rubber strip is bonded and fixed to the outer wall of the driving wheel.

[0015] As a further solution of the present invention, the tensioning assembly is symmetrically arranged on the side of the fixed block, and the tensioning assembly includes an auxiliary roller and an L-shaped fixing rod welded and fixed to the side of the fixed block, and an inner cavity is opened inside the L-shaped fixing rod, and a tension spring is welded in the inner cavity, the upper end of the L-shaped fixing rod is inserted with an upper fixing rod through the inner cavity, the lower end of the upper fixing rod is welded and fixed to the tension spring, and the side of the upper end of the upper fixing rod is integrally formed with a mounting surface, and the side of the mounting surface is installed with bearing 2, the end of the auxiliary roller is inserted into the inner ring of bearing 2, and the auxiliary roller and the driving wheel are respectively tightly attached to the upper surface and the guide groove of the linear slide rail through the tensioning action of the tension spring.

[0016] As a further solution of the present invention, the welding mechanism includes a fixed plate, a plasma welding gun and a laser emitter are installed at the lower part of the fixed plate, and the laser emitter and the plasma welding gun are parallel, a sleeve is welded to the upper end of the fixed plate, and a pillar is slidably inserted into the upper end of the sleeve, and the upper end of the pillar is welded and fixed to the fixed block.

[0017] As a further solution of the present invention, the upper end of the fixed plate is also rotatably connected to the lower rotating drum through a bearing, the upper end of the lower rotating drum is threadedly connected to a threaded column, the upper end of the threaded column is fixedly connected to the fixed block, and the outer side of the lower rotating drum is integrally formed with a rotating part with anti-slip grooves on the outer wall.

[0018] Compared with the prior art, the present invention provides a bridge steel plate welding device that is easy to load and unload, and has the following beneficial effects:

[0019] 1. The present invention drives the driving wheel to rotate through the driving motor in the driving assembly. The driving assembly can generate sufficient friction between the driving wheel and the guide groove through the tension spring in the upper tensioning assembly to drive the lower welding mechanism to perform welding. The entire sliding track structure is annular. The driving assembly drives the sliding of the welding mechanism to weld both sides of the bridge steel plate, thereby improving the welding efficiency.

[0020] 2. The present invention is installed between the two welding table bodies through the welding mechanism through the lower fixing mechanism, and the fixing mechanism has the function of lifting and lowering through the cylinder. In this way, when welding bridge steel plates of different thicknesses, the height of the circular track can be adjusted by the extension and contraction of the cylinder, so that the plate can always be located in the center of the track, thereby improving the welding effect.

[0021] 3. The present invention enables the plasma welding gun to have a height adjustment function through the lower rotating cylinder and threaded column between the driving assembly and the welding mechanism, so that the plasma welding gun can be close to bridge steel plates of different thicknesses. Combined with the height adjustment function of the fixing mechanism, the welding effect of different types of bridge steel plates is further improved.

[0022] 4. The present invention uses a positioning mechanism to fix the two plates to be welded after adjusting their positions. The positioning mechanism is easy to operate. The threaded rod can be extended or retracted by rotating the knob, thereby pushing the positioning block to limit the edge of the steel plate. In addition, because a parallel laser emitter is provided on the side of the plasma welding gun, the laser emitted by the laser emitter can mark the welding point of the plate. In conjunction with the positioning mechanism, the determination of the welding position can be made more convenient.

[0023] 5. The present invention uses a loading and unloading conveyor mechanism to load and unload the welding plates. The edge of the welding table is provided with a guide surface, which facilitates the loading and unloading process. The multiple sets of conveyor rollers can disperse the gravity of the steel plates, thereby improving the efficiency of loading and unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the three-dimensional structure of the best embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the welding mechanism and the sliding track structure in the best embodiment of the present invention;

[0026] Figure 3 This is a structural diagram of the loading and unloading conveying mechanism of the best embodiment of the present invention;

[0027] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part A;

[0028] Figure 5 This is a schematic structural diagram of the sliding track structure of the best embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the front three-dimensional structure of the driving assembly of the best embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the front three-dimensional structure of the tensioning assembly according to the best embodiment of the present invention.

[0031] Figure: 1. Welding table body; 2. Loading and unloading conveying mechanism; 3. Alignment mechanism; 4. Slide track structure; 5. Fixing mechanism; 6. Welding mechanism; 7. Tensioning assembly; 8. Driving assembly; 101. Guide surface; 102. Mounting groove; 201. Conveyor roller; 301. Side plate; 302. Threaded seat; 303. Threaded rod; 304. Knob; 305. Bearing 1; 306. Alignment block; 401. Linear slide; 402. Arc slide; 403. Guide groove; 501. Bottom fixing seat; 502. Fixing hole ;503, cylinder; 601, fixed plate; 602, plasma welding gun; 603, laser emitter; 604, sleeve; 605, pillar; 606, lower rotating drum; 607, threaded column; 608, rotating part; 701, L-shaped fixing rod; 702, inner cavity; 703, tension spring; 704, upper fixing rod; 705, mounting surface; 706, bearing 2; 707, auxiliary roller; 801, fixing block; 802, through slot; 803, driving motor; 804, driving wheel; 805, anti-slip rubber strip. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention include direct and indirect connections (couplings) unless otherwise specified. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0034] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] Reference Figure 1-Figure 7 A bridge steel plate welding equipment that is convenient for loading and unloading includes two groups of welding table bodies 1, the welding table body 1 is provided with a loading and unloading conveying mechanism 2, and the welding table body 1 is provided with a positioning mechanism 3 for aligning the two groups of bridge steel plates to be welded, a sliding track structure 4 is provided between the two groups of welding table bodies 1, and the lower end of the sliding track structure 4 is provided with a fixing mechanism 5 with a lifting function, and a welding mechanism 6 is provided on the inner side of the sliding track structure 4, and the upper part of the welding mechanism 6 is provided with a tensioning component 7 that cooperates with the sliding track structure 4, and the welding mechanism 6 is also provided with a driving component 8 for driving the welding mechanism 6 to slide along the sliding track structure 4.

[0036] In particular, in the present invention, the loading and unloading conveying mechanism 2 is composed of several groups of conveying rollers 201, and a guide surface 101 is integrally formed at the edge of the welding table body 1. The upper surface of the welding table body 1 is provided with several groups of mounting grooves 102, and the mounting grooves 102 are evenly spaced. The conveying rollers 201 are installed in the mounting grooves 102. The conveying rollers 201 are power rollers. The multiple groups of conveying rollers 201 can disperse the gravity of the steel plate, thereby improving the efficiency of loading and unloading.

[0037] It should be noted that four sets of alignment mechanisms 3 are provided on each welding table body 1. The alignment mechanism 3 includes a side plate 301 and an alignment block 306. The side plate 301 is welded to the welding table body 1, and a threaded seat 302 is integrally formed on the side plate 301. The inner side of the threaded seat 302 is threadedly connected to a threaded rod 303, and the outer end of the threaded rod 303 is welded with a knob 304 with anti-slip grooves on the surface. A bearing 305 is installed on one side of the alignment block 306. The end of the welding table body 1 away from the knob 304 is fixedly inserted into the inner ring of the bearing 305. Rotating the knob 304 can make the threaded rod 303 extend and retract, and the threaded rod 303 and the alignment block 306 are connected by a bearing rotation connection, so that wear can be reduced when contacting the side wall of the steel plate.

[0038] In particular, in the present invention, the sliding track structure 4 includes a linear slide rail 401 and an arc slide rail 402. The linear slide rail 401 and the arc slide rail 402 are integrally cast and formed, and a guide groove 403 is provided on the inner side of the linear slide rail 401 and the arc slide rail 402. The inner wall of the guide groove 403 is provided with tiny anti-slip grooves, and the plasma welding gun 602 will not work when it is on the arc slide rail 402.

[0039] It should be noted that the fixing mechanism 5 includes two groups of symmetrically arranged bottom fixing seats 501, and two groups of symmetrical fixing holes 502 are opened on the bottom fixing seat 501, and the upper end of the bottom fixing seat 501 is installed with a cylinder 503 by bolts, and the piston end of the cylinder 503 and the linear slide rail 401 are fixedly connected by bolts. The entire welding equipment is installed through the fixing mechanism 5, and the fixing hole 502 is a through hole. The fixing mechanism 5 is installed to the ground through the fixing hole 502 of the bottom fixing seat 501 in conjunction with the expansion bolts.

[0040] In particular, in the present invention, the driving assembly 8 includes a fixed block 801 with rounded edges, and a through slot 802 is provided on the fixed block 801, and a driving motor 803 is installed inside the through slot 802 by bolts, and the output shaft of the driving motor 803 is fixedly connected to the driving wheel 804 by a flat key, and the outer wall of the driving wheel 804 is bonded and fixed with an anti-slip rubber strip 805, which can increase the friction between the outer wall of the driving wheel 804 and the inner wall of the guide groove 403, making the translation of the entire welding mechanism 6 more stable.

[0041] It should be noted that the tensioning assembly 7 is symmetrically arranged on the side of the fixed block 801. The tensioning assembly 7 includes an auxiliary roller 707 and an L-shaped fixing rod 701 welded and fixed to the side of the fixed block 801. The L-shaped fixing rod 701 has an inner cavity 702, and a tension spring 703 is welded in the inner cavity 702. The upper end of the L-shaped fixing rod 701 is inserted with the upper fixing rod 704 through the inner cavity 702. The lower end of the upper fixing rod 704 is welded and fixed to the tension spring 703. The side of the upper end of the upper fixing rod 704 is integrally formed with a mounting surface 705. The side of the mounting surface 705 is installed with a bearing 2 706. The end of the auxiliary roller 707 is inserted into the inner ring of the bearing 2 706, and the auxiliary roller 707 and the driving wheel 804 are respectively tightly attached to the upper surface of the linear slide 401 and the guide groove 403 through the tensioning action of the tension spring 703.

[0042] In particular, in the present invention, the welding mechanism 6 includes a fixed plate 601, and a plasma welding gun 602 and a laser emitter 603 are installed at the lower part of the fixed plate 601, and the laser emitter 603 and the plasma welding gun 602 are parallel. The laser emitted by the laser emitter 603 can mark the welding point of the plate, and cooperate with the positioning mechanism 3 to make the determination of the welding position more convenient. The upper end of the fixed plate 601 is welded with a sleeve 604, and the upper end of the sleeve 604 is slidably inserted with a pillar 605, and the upper end of the pillar 605 is welded and fixed to the fixed block 801.

[0043] It should be noted that the upper end of the fixed plate 601 is also rotatably connected to the lower rotating cylinder 606 through a bearing, and the upper end of the lower rotating cylinder 606 is threadedly connected to a threaded column 607. The upper end of the threaded column 607 is fixedly connected to the fixed block 801, and the outer side of the lower rotating cylinder 606 is integrally formed with a rotating portion 608 with anti-slip grooves on the outer wall. By rotating the rotating portion 608 of the lower rotating cylinder 606, the threaded column 607 can be extended and retracted, thereby changing the vertical position of the plasma welding gun 602, and through the cooperation of the sleeve 604 and the support 605, the position of the plasma welding gun 602 can be kept in vertical movement as much as possible.

[0044] The present invention is divided into the following steps when used:

[0045] S1: First, install the welding equipment through the fixing holes 502 at the bottom of the fixing mechanism 5 with expansion bolts, and make sure that the sliding track structure 4 is located at the midpoint of the two welding table bodies 1;

[0046] S2: After the plate is produced, it is transported to the welding table body 1 on one side, and the plate is driven by the conveying roller 201 to move until the first plate passes through the welding mechanism 6 and is transported to the second welding table body 1;

[0047] S3: The position of the first plate is adjusted by the conveying roller 201 on the rear welding platform body 1 so that the edge of the plate is directly below the plasma welding torch 602 as much as possible, and the conveying roller 201 on the rear welding platform body 1 is stopped;

[0048] S4: Place another plate on the conveyor roller 201 on the front welding table body 1 for output, and stop when the two plates are about to collide;

[0049] S5: Start the laser emitter 603 to mark the welding point, adjust the gap between the two plates so that it is located on the welding track, and then rotate the knob 304 to allow the positioning block 306 to limit and fix the edges of the two plates;

[0050] S6: Adjust the position of the sliding track structure 4 by controlling the extension length of the cylinder 503 so that the plate is located in the center of the track;

[0051] S7: Adjust the position of the plasma welding gun 602 by rotating the rotating portion 608 of the lower rotating drum 606 so that the plasma welding gun 602 can function as effectively as possible;

[0052] S8: Start the drive motor 803 to drive the welding mechanism 6 to move along the sliding track structure 4, thereby welding both sides of the plate. Whenever the plasma welding gun 602 moves away from the edge of the plate, it will be turned off to prevent the plasma welding gun 602 from burning the track;

[0053] S9: After welding is completed, the conveying roller 201 is started to unload the material.

[0054] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A bridge steel plate welding device that is convenient for loading and unloading, comprising two sets of welding table bodies (1), characterized in that: The welding table body (1) is provided with a loading and unloading conveying mechanism (2), and the welding table body (1) is provided with a positioning mechanism (3) for aligning two groups of bridge steel plates to be welded, a sliding track structure (4) is provided between the two groups of welding table bodies (1), and a fixing mechanism (5) with a lifting function is provided at the lower end of the sliding track structure (4), and a welding mechanism (6) is provided on the inner side of the sliding track structure (4), and a tensioning component (7) cooperating with the sliding track structure (4) is provided on the upper part of the welding mechanism (6), and a driving component (8) for driving the welding mechanism (6) to slide along the sliding track structure (4) is also provided on the welding mechanism (6).

2. The bridge steel plate welding equipment that is convenient for loading and unloading according to claim 1 is characterized in that: The loading and unloading conveying mechanism (2) is composed of a plurality of groups of conveying rollers (201), and a guide surface (101) is integrally formed at the edge of the welding platform body (1), and a plurality of groups of mounting grooves (102) are opened on the upper surface of the welding platform body (1), and the mounting grooves (102) are evenly spaced and distributed, and the conveying rollers (201) are installed in the mounting grooves (102).

3. The bridge steel plate welding equipment that is convenient for loading and unloading according to claim 1 is characterized in that: Each group of the welding platform body (1) is provided with four groups of alignment mechanisms (3), the alignment mechanisms (3) comprising side plates (301) and alignment blocks (306), the side plates (301) being welded to the welding platform body (1), and the side plates (301) being integrally formed with a threaded seat (302), the inner side of the threaded seat (302) being threadedly connected to a threaded rod (303), and the outer end of the threaded rod (303) being welded with a knob (304) with anti-slip grooves on the surface, a bearing 1 (305) being installed on one side of the alignment block (306), and the end of the welding platform body (1) away from the knob (304) being fixedly plugged into the inner ring of the bearing 1 (305).

4. The bridge steel plate welding equipment that is convenient for loading and unloading according to claim 1 is characterized in that: The sliding track structure (4) comprises a linear slide rail (401) and an arcuate slide rail (402), wherein the linear slide rail (401) and the arcuate slide rail (402) are integrally formed, and guide grooves (403) are provided on the inner sides of the linear slide rail (401) and the arcuate slide rail (402).

5. The bridge steel plate welding equipment that is convenient for loading and unloading according to claim 4 is characterized in that: The fixing mechanism (5) comprises two groups of symmetrically arranged bottom fixing seats (501), and two groups of symmetrical fixing holes (502) are opened on the bottom fixing seats (501). The upper end of the bottom fixing seat (501) is mounted with a cylinder (503) via bolts, and the piston end of the cylinder (503) and the linear slide rail (401) are fixedly connected via bolts.

6. The bridge steel plate welding equipment that is convenient for loading and unloading according to claim 5 is characterized in that: The driving assembly (8) comprises a fixing block (801) with a rounded edge, a through slot (802) is formed on the fixing block (801), a driving motor (803) is installed inside the through slot (802) via bolts, and an output shaft of the driving motor (803) is fixedly connected to a driving wheel (804) via a flat key, and an anti-slip rubber strip (805) is bonded and fixed to the outer wall of the driving wheel (804).

7. The bridge steel plate welding equipment that is convenient for loading and unloading according to claim 6 is characterized in that: The tensioning assembly (7) is symmetrically arranged on the side of the fixing block (801), and the tensioning assembly (7) includes an auxiliary roller (707) and an L-shaped fixing rod (701) welded and fixed to the side of the fixing block (801), and an inner cavity (702) is opened inside the L-shaped fixing rod (701), and a tension spring (703) is welded in the inner cavity (702), and the upper end of the L-shaped fixing rod (701) is connected to the upper fixing rod (704) through the inner cavity (702), and the upper fixing rod (704) is connected to the upper fixing rod (704). 04) is welded and fixed to the tension spring (703), and the side of the upper end of the upper fixed rod (704) is integrally formed with a mounting surface (705), and the side of the mounting surface (705) is installed with a bearing 2 (706), and the end of the auxiliary roller (707) is inserted into the inner ring of the bearing 2 (706), and the auxiliary roller (707) and the driving wheel (804) are respectively tightly attached to the upper surface of the linear slide rail (401) and the guide groove (403) through the tensioning action of the tension spring (703).

8. The bridge steel plate welding equipment that is convenient for loading and unloading according to claim 6 is characterized in that: The welding mechanism (6) comprises a fixed plate (601), a plasma welding gun (602) and a laser emitter (603) are mounted on the lower portion of the fixed plate (601), and the laser emitter (603) and the plasma welding gun (602) are parallel to each other; a sleeve (604) is welded to the upper end of the fixed plate (601), and a support (605) is slidably inserted into the upper end of the sleeve (604); and the upper end of the support (605) is welded and fixed to the fixed block (801).

9. The bridge steel plate welding equipment that is convenient for loading and unloading according to claim 8 is characterized in that: The upper end of the fixed plate (601) is rotatably connected to a lower rotating drum (606) via a bearing, the upper end of the lower rotating drum (606) is threadedly connected to a threaded column (607), the upper end of the threaded column (607) is fixedly connected to the fixed block (801), and the outer side of the lower rotating drum (606) is integrally formed with a rotating portion (608) with an outer wall having anti-slip grooves.

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