Portable unloading device for logistics

Abstract

The invention discloses a portable logistics unloading device, and belongs to the technical field of logistics unloading, the portable logistics unloading device comprises a base with rolling wheels mounted at the bottom, a first conveying frame is fixedly mounted above the base, and a second conveying frame and a third conveying frame are arranged above the first conveying frame layer by layer; the two lifting assemblies are arranged between the first conveying frame and the first lifting plate and between the second conveying frame and the second lifting plate correspondingly; the two adjusting assemblies are connected between the first lifting plate and the second conveying frame and between the second lifting plate and the third conveying frame correspondingly. The two fixed side plates are fixedly installed on the right side of the second conveying frame and the left side of the third conveying frame correspondingly. The portable unloading device for logistics can be conveniently folded and stored, cargoes can be effectively buffered in the unloading process, the connecting stability between the portable unloading device and a carriage can be automatically improved in the buffering process, and the safety in the unloading and conveying process is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of logistics unloading, and in particular to a portable logistics unloading device. Background Art

[0002] In the process of logistics transportation, trucks are needed for loading and unloading. After the goods are delivered to the destination, they need to be unloaded from the truck. Therefore, an unloading device is needed. Existing unloading devices often use a single conveyor frame to realize the conveying and unloading of goods. In order to avoid excessive conveying rate, it is necessary to reduce the conveying slope by extending the conveyor frame, which makes the required length of the conveyor frame too large and inconvenient to carry and transport.

[0003] The prior art (application number: 202011426347.4, Chinese patent with application date of 2020-12-09) discloses an energy-saving and environmentally friendly portable logistics unloading device, which mainly includes a top slide, a middle slide, a bottom slide, a base, a dual-axis angle adjustment seat and a single-axis angle adjustment seat, wherein the top slide is connected to the middle slide through a dual-axis angle adjustment seat, the top slide is located above the middle slide, the middle slide is connected to the bottom slide through a dual-axis angle adjustment seat, the middle slide is located above the bottom slide, the bottom slide is connected to the base through a single-axis angle adjustment seat, and the bottom slide is located above the base. The present invention is mainly used in the unloading of heavy goods such as logistics parcels, and its unloading process adopts a physical method. During the unloading process, the impact force of the goods sliding can be effectively reduced by the buffering of multiple buffer plates, which can better protect the goods. The whole process does not consume energy and does not pollute the environment. It is simple to operate, convenient to use, easy to carry, has a wide range of applications, and high application flexibility. However, the existing unloading device cannot improve the overall stability of the equipment frame when transporting heavy goods, making it easy for the equipment to be displaced due to the impact of the goods, resulting in separation from the carriage and affecting the subsequent unloading of the goods, and there are certain use defects. Summary of the invention

[0004] The purpose of the present invention is to provide a portable logistics unloading device to solve the problem raised by the above background technology that the logistics unloading device currently on the market cannot improve the overall stability of the equipment frame when transporting heavy goods, making the equipment easily displaced due to the impact of the goods and causing it to detach from the car, thus affecting the subsequent unloading of the goods.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a portable unloading device for logistics, comprising a base with rollers installed at the bottom, a first conveying frame fixedly installed above the base, and a second conveying frame and a third conveying frame are arranged layer by layer above the first conveying frame, and conveying rollers are installed on the first conveying frame, and a first lifting plate and a second lifting plate are respectively arranged above the first conveying frame and the second conveying frame; It also includes: two sets of lifting components, which are respectively arranged between the first conveying frame and the first lifting plate and between the second conveying frame and the second lifting plate, and the height adjustment of the second conveying frame and the third conveying frame is achieved through lifting adjustment; Two groups of adjustment components are respectively connected between the first lifting plate and the second conveying frame and between the second lifting plate and the third conveying frame to realize the regulation of the inclination angles of the second conveying frame and the third conveying frame; Two fixed side plates are respectively fixedly mounted on the right side of the second conveying frame and the left side of the third conveying frame, and the outer sides of the fixed side plates are connected with buffer components for realizing conveying buffer for logistic parts; The movable plate is rotatably mounted on the right end of the third conveying frame, and an adsorption component is arranged on the movable plate for adsorbing on the carriage of the logistics vehicle.

[0006] Preferably, the lifting assembly includes two groups of threaded rods rotatably mounted on the first conveying frame and the second conveying frame, and the threads at both ends of the threaded rods have opposite rotation directions, and the two ends of the threaded rods are symmetrically threadedly connected to two first sliders, and at the same time, a first connecting rod is rotatably connected between the first slider on the first conveying frame and the first lifting plate, and a first connecting rod is also connected between the first slider on the second conveying frame and the second lifting plate.

[0007] By adopting the above technical solution, the rotating threaded rod can drive the two first sliders on its outer side to move synchronously, thereby driving the first lifting plate and the second lifting plate to be lifted and lowered through the first connecting rod, thereby realizing the position height adjustment of the second conveying rack and the third conveying rack.

[0008] Preferably, guide rods are vertically fixed on the first conveying frame and the second conveying frame, and two groups of guide rods pass through the first lifting plate and the second lifting plate respectively, and the first lifting plate and the second lifting plate form a lifting structure with the guide rods.

[0009] By adopting the above technical solution, the lifting component can stably adjust the working heights of the second conveyor rack and the third conveyor rack, which is convenient for setting up the conveying of logistics items of different sizes.

[0010] Preferably, the adjustment assembly includes a guide seat fixedly mounted on the right side of the upper surface of the first lifting plate and on the left side of the upper surface of the second lifting plate, and a second slider is slidably arranged on the inner side of the guide seat, and a first spring is connected between the second slider and the inner wall of the guide seat, and a steel cable is fixedly connected to the outer side of the second slider, and the lower ends of the two groups of steel cables are respectively fixedly connected to the first conveying frame and the second conveying frame.

[0011] By adopting the above technical solution, as the first lifting plate and the second lifting plate are adjusted upward, the steel cable can automatically pull the second sliding block to slide elastically on the inner side of the guide seat.

[0012] Preferably, a second connecting rod is rotatably connected between the left side of the upper surface of the first lifting plate and the middle of the lower surface of the second conveyor rack, and a second connecting rod is also rotatably connected between the right side of the upper surface of the second lifting plate and the middle position of the lower surface of the third conveyor rack, and the second conveyor rack and the third conveyor rack are respectively rotatably connected to the second sliders below them.

[0013] By adopting the above technical solution, when the second slider slides, the second connecting rod can push the second conveying frame and the third conveying frame to rotate around the second slider, thereby adjusting the working angles of the second conveying frame and the third conveying frame.

[0014] Preferably, the first conveying rack, the second conveying rack and the third conveying rack are distributed in a Z shape when working, and the upper end of the third conveying rack after tilting is in contact with the opening of the logistics carriage.

[0015] By adopting the above technical solution, the device can be connected with the logistics compartment opening through the lifting and rotation adjustment of the second conveying rack and the third conveying rack, thereby facilitating the transportation and unloading of logistics items in the compartment.

[0016] Preferably, the buffer assembly includes a telescopic rod that passes through and is telescopically installed on the fixed side panel, and the end of the telescopic rod away from the fixed side panel is fixedly connected to the buffer plate, and a buffer spring is connected between the fixed side panel and the buffer plate, and a buffer airbag is also connected between the fixed side panel and the buffer plate.

[0017] By adopting the above technical solution, when the goods are slidably transported along the conveying rollers on the second conveying frame and the third conveying frame, the buffer plate can buffer the goods to prevent the goods from slipping off the conveying rollers.

[0018] Preferably, the adsorption assembly includes an air cylinder that is uniformly penetrated and fixed on the movable plate, and a sealing suction cup is fixedly connected to the lower end of the air cylinder, and the sealing suction cup is sealed and adsorbed on the inner wall of the vehicle compartment.

[0019] By adopting the above technical solution, the movable plate can be rotated during unloading, so that the sealing suction cup at the lower end of the air cylinder can be adsorbed on the inner wall of the carriage, thereby realizing the overall auxiliary positioning of the device.

[0020] Preferably, the adsorption assembly also includes a pull rod passing through the upper end of the air cylinder, and the lower end of the pull rod is fixedly connected to a piston plate, and the piston plate and the inner wall of the air cylinder are interference slidingly connected, and a second spring is connected between the piston plate and the inner wall of the air cylinder, and an elastic airbag is connected between the upper end surface of the air cylinder and the upper end of the pull rod, and adjacent elastic airbags are connected by pipes, and the elastic airbag and the buffer airbag on the left are connected by a pipe, and the two buffer airbags are connected by an air supply pipe.

[0021] By adopting the above technical solution, when the buffer plate is hit by cargo, the buffer airbag will be squeezed, so that part of the gas in the buffer airbag enters the elastic airbag through the pipeline, and the elastic airbag expands and pushes the pull rod upward, thereby pulling the piston plate upward on the inner side of the air cylinder, thereby further improving the adsorption force of the sealing suction cup and ensuring the positioning stability of the equipment when cargo hits the equipment.

[0022] Compared with the prior art, the beneficial effects of the present invention are: the portable unloading device for logistics can be conveniently folded and stored, and the goods can be effectively buffered during the unloading process, and the connection stability between the vehicle compartment can be automatically improved during the buffering process, thereby ensuring the safety during the unloading and transportation process. The specific contents are as follows; 1. A first conveyor frame, a second conveyor frame and a third conveyor frame are provided. By rotating the threaded rod, the first lifting plate and the second lifting plate can be driven to be lifted and lowered, so that the second conveyor frame and the third conveyor frame are lifted. During the lifting process of the second conveyor frame and the third conveyor frame, the second conveyor frame and the third conveyor frame will be synchronously rotated and adjusted under the action of the tension of the steel cable, so that the first conveyor frame, the second conveyor frame and the third conveyor frame are distributed in a Z shape, so as to realize short-range and stable transportation of goods. The folding assembly method is adopted, which can facilitate the transportation and carrying of the equipment; 2. A buffer plate is provided. When the goods slide on the surface of the conveyor roller, the goods will hit the buffer plate during the falling process, so that the buffer plate can slide elastically through the buffer spring and the fixed side plate, and then the elastic force of the buffer spring and the buffer airbag can effectively buffer the goods in transit, avoiding damage to the goods due to excessive conveying speed; 3. An air cylinder and a sealing suction cup are provided. When the buffer plate is hit, the buffer airbag will be compressed and part of the gas inside it will be transferred to the elastic airbag, causing the elastic airbag to expand, thereby pushing the pull rod to drive the piston plate to rise on the inside of the air cylinder, thereby increasing the adsorption strength of the sealing suction cup and the carriage, effectively ensuring the stability and safety of the device in transporting heavy goods. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a bottom view structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the connection structure between the first conveyor frame and the second conveyor frame of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the guide seat of the present invention; Figure 5 This is a schematic diagram of the installation structure of the cushioning airbag of the present invention; Figure 6 It is a schematic diagram of the connection structure between the movable plate and the air cylinder of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the gas cylinder of the present invention; Figure 8 For the present invention Figure 3 Enlarged structural diagram at A in the middle.

[0024] In the figure: 1, base; 2, first conveyor frame; 3, second conveyor frame; 4, third conveyor frame; 5, first lifting plate; 6, second lifting plate; 7, threaded rod; 8, first slider; 9, first connecting rod; 10, guide rod; 11, guide seat; 12, second slider; 13, steel cable; 14, first spring; 15, second connecting rod; 16, fixed side plate; 17, telescopic rod; 18, buffer spring; 19, buffer plate; 20, buffer airbag; 21, air pipe; 22, movable plate; 23, air cylinder; 24, sealing suction cup; 25, pull rod; 26, elastic airbag; 27, piston plate; 28, second spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0026] Example 1: Please refer to Figure 1-Figure 3 and Figure 8 As shown, the existing unloading device for logistics cannot be conveniently folded during use, so that the operating size is large and difficult to carry and transport. In order to solve this technical problem, this embodiment discloses the following technical content; A portable unloading device for logistics comprises a base 1 with rollers installed at the bottom, a first conveying frame 2 is fixedly installed above the base 1, and a second conveying frame 3 and a third conveying frame 4 are arranged layer by layer above the first conveying frame 2, and conveying rollers are installed on the first conveying frame 2, the second conveying frame 3 and the third conveying frame 4, and a first lifting plate 5 and a second lifting plate 6 are respectively arranged above the first conveying frame 2 and the second conveying frame 3; It also includes: two sets of lifting components, which are respectively arranged between the first conveying frame 2 and the first lifting plate 5 and between the second conveying frame 3 and the second lifting plate 6, and the height adjustment of the second conveying frame 3 and the third conveying frame 4 is achieved through lifting adjustment; Two groups of adjustment components are respectively connected between the first lifting plate 5 and the second conveying frame 3 and between the second lifting plate 6 and the third conveying frame 4 to adjust the inclination angles of the second conveying frame 3 and the third conveying frame 4; The lifting assembly includes two sets of threaded rods 7 rotatably mounted on the first conveying frame 2 and the second conveying frame 3, and the threads at both ends of the threaded rods 7 have opposite rotation directions, and the two ends of the threaded rods 7 are symmetrically threadedly connected with two first sliders 8, and at the same time, a first connecting rod 9 is rotatably connected between the first slider 8 on the first conveying frame 2 and the first lifting plate 5, and a first connecting rod 9 is also connected between the first slider 8 on the second conveying frame 3 and the second lifting plate 6.

[0027] Guide rods 10 are vertically fixed on the first conveying frame 2 and the second conveying frame 3 , and two groups of guide rods 10 penetrate the first lifting plate 5 and the second lifting plate 6 respectively, and the first lifting plate 5 and the second lifting plate 6 form a lifting structure with the guide rods 10 .

[0028] The adjustment assembly includes a guide seat 11 fixedly installed on the right side of the upper surface of the first lifting plate 5 and the left side of the upper surface of the second lifting plate 6, and a second slider 12 is slidably arranged on the inner side of the guide seat 11, and a first spring 14 is connected between the second slider 12 and the inner wall of the guide seat 11, and a steel cable 13 is fixedly connected to the outer side of the second slider 12, and the lower ends of the two groups of steel cables 13 are respectively fixedly connected to the first conveying frame 2 and the second conveying frame 3.

[0029] A second connecting rod 15 is rotatably connected between the left side of the upper surface of the first lifting plate 5 and the middle of the lower surface of the second conveying frame 3, and a second connecting rod 15 is also rotatably connected between the right side of the upper surface of the second lifting plate 6 and the middle position of the lower surface of the third conveying frame 4, and the second conveying frame 3 and the third conveying frame 4 are respectively rotatably connected to the second slider 12 below them.

[0030] The first conveying frame 2, the second conveying frame 3, and the third conveying frame 4 are distributed in a Z shape when working, and the upper end of the third conveying frame 4 after tilting is in contact with the opening of the logistics compartment.

[0031] By adopting the above technical scheme, when it is necessary to unload materials and goods, the equipment is pushed to the outside of the carriage through the rollers under the base 1 and the rollers are locked, and then the threaded rod 7 is rotated so that the threaded rod 7 and the first slider 8 are threadedly connected, so that the two first sliders 8 on the outside of the threaded rod 7 are close to each other, so that the first connecting rod 9 is rotated, and then the first lifting plate 5 and the second lifting plate 6 are pushed to adjust the height, and at the same time, the position height of the second conveying frame 3 and the third conveying frame 4 can be increased, and as the first lifting plate 5 and the second lifting plate 6 rise, the second slider 12 will elastically slide along the guide seat 11 under the tension of the steel cable 13, and when the second slider 12 slides, the second connecting rod 15 can support the second conveying frame 3 and the third conveying frame 4, so that the second conveying frame 3 and the third conveying frame 4 can rotate around the second slider 12, thereby adjusting the working angles of the second conveying frame 3 and the third conveying frame 4, and at this time, the third conveying frame 4 is close to the rear end of the carriage, which is convenient for subsequent transportation and loading and unloading of goods.

[0032] Embodiment 2: The technical content disclosed in this embodiment is a further improvement on the above embodiment 1. The existing unloading device for logistics cannot effectively buffer and improve the support stability of the device when unloading heavy goods. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 2-Figure 7 As shown; Two fixed side plates 16 are respectively fixedly mounted on the right side of the second conveying frame 3 and the left side of the third conveying frame 4. The outer side of the fixed side plates 16 is connected with a buffer assembly to realize the conveying buffer of the logistics parts. The movable plate 22 is rotatably mounted on the right end of the third conveying frame 4 , and an adsorption component is provided on the movable plate 22 for adsorbing on the compartment of the logistics vehicle.

[0033] The buffer assembly includes a telescopic rod 17 that penetrates and is telescopically installed on the fixed side plate 16, and the end of the telescopic rod 17 away from the fixed side plate 16 is fixedly connected to a buffer plate 19, and a buffer spring 18 is connected between the fixed side plate 16 and the buffer plate 19, and a buffer airbag 20 is also connected between the fixed side plate 16 and the buffer plate 19.

[0034] The adsorption assembly includes an air cylinder 23 uniformly penetrating and fixed on the movable plate 22, and a sealing suction cup 24 is fixedly connected to the lower end of the air cylinder 23, and the sealing suction cup 24 is sealed and adsorbed on the inner wall of the vehicle compartment.

[0035] The adsorption assembly also includes a pull rod 25 passing through the upper end of the air cylinder 23, and the lower end of the pull rod 25 is fixedly connected to a piston plate 27, and the piston plate 27 and the inner wall of the air cylinder 23 are interference slidingly connected, and a second spring 28 is connected between the piston plate 27 and the inner wall of the air cylinder 23, and an elastic air bag 26 is connected between the upper end surface of the air cylinder 23 and the upper end of the pull rod 25, and adjacent elastic air bags 26 are connected by pipes, and the elastic air bag 26 and the buffer air bag 20 on the left are connected by a pipe, and the two buffer air bags 20 are connected by an air supply pipe 21.

[0036] By adopting the above technical solution, when the upper end of the third conveying frame 4 is close to the tail of the carriage, the movable plate 22 is rotated and pressed, so that the sealing suction cup 24 is initially adsorbed on the inner wall of the carriage, and the goods are placed on the conveying roller for transportation. When the goods are conveyed from the third conveying frame 4 to the second conveying frame 3, the buffer plate 19 can buffer and support the goods under the elastic force of the buffer spring 18 and the buffer airbag 20, and when the goods are conveyed from the second conveying frame 3 to the first conveying frame 2, the buffer plate 19 located below can buffer the goods again. As the buffer plate 19 is compressed, the buffer airbag 20 can be compressed to convey part of the air to the elastic airbag 26, so that the elastic airbag 26 expands and then pushes the pull rod 25 to move elastically upward. At this time, the pull rod 25 will pull the piston plate 27 to rise in the air cylinder 23, further improving the adsorption stability between the sealing suction cup 24 and the inner wall of the carriage, thereby ensuring the safety of cargo transportation.

[0037] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A portable unloading device for logistics, comprising a base (1) with rollers installed at the bottom, a first conveying frame (2) fixedly installed above the base (1), and a second conveying frame (3) and a third conveying frame (4) arranged layer by layer above the first conveying frame (2), and conveying rollers are installed on the first conveying frame (2), the second conveying frame (3) and the third conveying frame (4), and a first lifting plate (5) and a second lifting plate (6) are respectively arranged above the first conveying frame (2) and the second conveying frame (3); It is characterized in that Also includes: Two sets of lifting components are respectively arranged between the first conveying frame (2) and the first lifting plate (5) and between the second conveying frame (3) and the second lifting plate (6), and the height of the second conveying frame (3) and the third conveying frame (4) can be adjusted by lifting and lowering; Two groups of adjustment components are respectively connected between the first lifting plate (5) and the second conveying frame (3) and between the second lifting plate (6) and the third conveying frame (4), so as to realize the regulation of the inclination angles of the second conveying frame (3) and the third conveying frame (4); Two fixed side plates (16) are respectively fixedly mounted on the right side of the second conveying frame (3) and the left side of the third conveying frame (4); the outer sides of the fixed side plates (16) are connected with buffer components for realizing conveying buffering of logistic items; The movable plate (22) is rotatably mounted on the right end of the third conveying frame (4), and an adsorption component is provided on the movable plate (22) for adsorbing on the carriage of the logistics vehicle.

2. A portable logistics unloading device according to claim 1, characterized in that: The lifting assembly comprises two groups of threaded rods (7) rotatably mounted on the first conveying frame (2) and the second conveying frame (3), wherein the threads at both ends of the threaded rods (7) are in opposite directions, and two first sliders (8) are symmetrically threadedly connected at both ends of the threaded rods (7), and a first connecting rod (9) is rotatably connected between the first slider (8) on the first conveying frame (2) and the first lifting plate (5), and a first connecting rod (9) is also connected between the first slider (8) on the second conveying frame (3) and the second lifting plate (6).

3. A portable logistics unloading device according to claim 2, characterized in that: Guide rods (10) are vertically fixedly arranged on the first conveying frame (2) and the second conveying frame (3), and the two groups of guide rods (10) respectively penetrate the first lifting plate (5) and the second lifting plate (6), and the first lifting plate (5) and the second lifting plate (6) form a lifting structure with the guide rods (10).

4. A portable logistics unloading device according to claim 1, characterized in that: The adjustment assembly comprises a guide seat (11) fixedly mounted on the right side of the upper surface of the first lifting plate (5) and the left side of the upper surface of the second lifting plate (6), and a second slider (12) is slidably arranged on the inner side of the guide seat (11), and a first spring (14) is connected between the second slider (12) and the inner wall of the guide seat (11), and a steel cable (13) is fixedly connected to the outer side of the second slider (12), and the lower ends of the two sets of steel cables (13) are respectively fixedly connected to the first conveying frame (2) and the second conveying frame (3).

5. A portable logistics unloading device according to claim 4, characterized in that: A second connecting rod (15) is rotatably connected between the left side of the upper surface of the first lifting plate (5) and the middle of the lower surface of the second conveying frame (3), and a second connecting rod (15) is also rotatably connected between the right side of the upper surface of the second lifting plate (6) and the middle position of the lower surface of the third conveying frame (4), and the second conveying frame (3) and the third conveying frame (4) are respectively rotatably connected to the second sliders (12) below them.

6. A portable logistics unloading device according to claim 5, characterized in that: The first conveying frame (2), the second conveying frame (3) and the third conveying frame (4) are distributed in a Z shape when in operation, and the upper end of the third conveying frame (4) is in contact with the opening of the logistics carriage after being tilted.

7. A portable logistics unloading device according to claim 1, characterized in that: The buffer assembly comprises a telescopic rod (17) which penetrates and is telescopically mounted on the fixed side plate (16); one end of the telescopic rod (17) which is away from the fixed side plate (16) is fixedly connected to a buffer plate (19); a buffer spring (18) is connected between the fixed side plate (16) and the buffer plate (19); and a buffer airbag (20) is also connected between the fixed side plate (16) and the buffer plate (19).

8. The portable unloading device for logistics according to claim 1, characterized in that: The adsorption assembly comprises an air cylinder (23) uniformly penetrating and fixed on the movable plate (22), and a sealing suction cup (24) is fixedly connected to the lower end of the air cylinder (23), and the sealing suction cup (24) is sealed and adsorbed on the inner wall of the vehicle compartment.

9. A portable logistics unloading device according to claim 8, characterized in that: The adsorption assembly also includes a pull rod (25) passing through the upper end of the air cylinder (23), and the lower end of the pull rod (25) is fixedly connected to a piston plate (27), and the piston plate (27) and the inner wall of the air cylinder (23) are connected in an interference sliding manner, and a second spring (28) is connected between the piston plate (27) and the inner wall of the air cylinder (23), and an elastic air bag (26) is connected between the upper end surface of the air cylinder (23) and the upper end of the pull rod (25), and adjacent elastic air bags (26) are connected by a pipeline, and the elastic air bag (26) and the buffer air bag (20) on the left are connected by a pipeline, and the two buffer air bags (20) are connected by an air supply pipe (21).

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