Connecting sling and greenhouse lower hanging cloth trolley

Abstract

The present application relates to material conveying equipment technical field, especially a kind of connecting sling and greenhouse lower hanging material trolley, comprising: track, the upper end of the track is provided with walking's stacker-reclaimer, the upper side of the left and right ends of the track is provided with connecting rod;Buffer component, rotationally connected in the outer end of connecting rod by fixed plate, the buffer component is used to buffer protection for connecting rod;Friction damping component, fixed at the end of buffer component away from fixed plate, the end of friction damping component away from buffer component is fixedly installed with fixed rod.When material trolley reciprocating operation generates high-frequency vibration, friction sliding occurs between friction ring piece and alloy steel sheet, vibration kinetic energy originally transmitted to net rack node is converted into heat energy and dissipated, stress amplitude at connecting node is greatly reduced, so that the initiation and expansion of fatigue crack at pinhole edge and weld are effectively inhibited, and the fracture problem caused by long-term reciprocating motion is solved.

Description

Technical Field

[0001] This invention relates to the field of material conveying equipment technology, and in particular to a connecting hoist and a trolley for hanging fabric under a greenhouse. Background Technology

[0002] Material storage sheds are primarily used in industrial settings such as cement plants, power plants, and mines, where there is a significant demand for material storage. In modern large-scale bulk material storage processes, to maximize the use of yard space, tracks are often suspended along the depth of the shed below the grid nodes. Reciprocating material-laying trolleys are then installed on these tracks. Figure 1 As shown.

[0003] Traditional connecting hangers mostly use rigid pin shafts or simple plate connection structures, such as Figure 1 As shown, when the fabric trolley starts, stops, accelerates, decelerates, or is impacted by materials, the high-frequency vibrations and instantaneous impact forces generated are directly transmitted to the grid nodes without any buffering. This rigid connection causes severe stress concentration at the connection point, which can lead to the breakage of the lifting device or the tearing of the grid node, resulting in serious safety accidents. Summary of the Invention

[0004] The purpose of this invention is to provide a connecting hoist and a trolley for hanging fabric under a greenhouse, so as to solve the problem that rigid connection causes severe stress concentration at the connection point, which in severe cases can lead to hoist breakage or tearing of the grid node, causing serious safety accidents.

[0005] The technical solution adopted in this invention to solve the technical problem is as follows: A connecting lifting device, comprising: The track has a traveling stacker-reclaimer installed at its upper end, and connecting rods are installed on the upper sides of both the left and right ends of the track. A buffer component is rotatably connected to the outer end of the connecting rod via a fixed plate. The buffer component is used to buffer and protect the connecting rod. A friction damping component is fixed to the end of the buffer component away from the fixed plate. A fixing rod is fixedly installed at the end of the friction damping component away from the buffer component. The fixing rod is used to fix and connect to the lower chord node of the greenhouse frame and the track. The friction damping component is used to absorb the vibration force transmitted to the frame.

[0006] The present invention also has the following technical features: In one embodiment of the present invention, the buffer component is provided with a protective shell, and a ball head seat is fixedly provided at the lower end of the protective shell. The protective shell includes an upper connecting plate and a lower connecting plate. A plurality of side plates are uniformly fixedly installed on the outer side between the upper connecting plate and the lower connecting plate. A damper is fixedly installed on the inner side of the upper connecting plate, and an extension component is fixedly installed at the inner end of the lower connecting plate.

[0007] In one embodiment of the present invention, the friction damping component includes a fixed ring and a rod. The lower ends of the fixed ring and the fixed column are fixedly connected. The lower end of the fixed ring is provided with a stacked friction assembly. The stacked friction assembly has a truncated cone stacked structure. The upper end of the rod passes through the stacked friction assembly and is fixedly installed with a rotating ball. The rotating ball is rotatably connected to the inner wall of the ball head seat.

[0008] In one embodiment of the present invention, the stacked friction assembly includes several alloy steel sheets, the diameter of which gradually increases from top to bottom, and the distance between adjacent alloy steel sheets gradually increases from top to bottom. Each alloy steel sheet has an annular channel in the middle. Each alloy steel sheet has lugs fixedly installed at both ends. Support columns are fixedly installed on the lower sides of both ends of the fixing ring. The lower ends of the support columns slide through several lugs and are fixedly installed with baffles. Several sets of second springs are uniformly sleeved on the outer ends of the support columns, and the second springs are located between two lugs.

[0009] In one embodiment of the present invention, an mounting plate is provided between each pair of adjacent alloy steel sheets. The alloy steel sheets and the mounting plates are coaxially sleeved on the outer end of the rod. The distance between adjacent mounting plates and alloy steel sheets gradually increases from top to bottom. A friction ring is fixedly installed at the lower end of each mounting plate, and an arc-shaped groove is fixedly installed in the middle part of the mounting plate.

[0010] In one embodiment of the present invention, a plurality of spheres with corresponding arc-shaped grooves are fixedly installed on the outer wall of the boom, and the arc-shaped grooves are rotatably sleeved on the outer end of the spheres.

[0011] In one embodiment of the present invention, the buffer component includes a connecting column, the connecting column is fixed to the upper end of the upper connecting plate, a ball joint seat is fixedly installed at the lower end of the lower connecting plate, a top plate is fixedly installed at the upper end of the connecting column, the top plate is rotatably connected to the fixed plate through a first ear plate and a second ear plate, and a plurality of fixed columns are evenly fixedly installed on the outer side of the lower end of the top plate, and the lower ends of the fixed columns slide through the side walls of the upper connecting plate and the lower connecting plate.

[0012] In one embodiment of the present invention, the extension assembly includes a movable plate and a movable frame. The movable plate is fixed to the output end of the damper. The movable plate is orifice-shaped and fixed to the inner end of the lower connecting plate. A slide rod is fixedly installed at the lower end of the movable plate. The lower end of the slide rod slides through the upper end of the movable frame and is fixedly installed with a stop block. A first spring is sleeved on the outer end of the slide rod. The first spring is fixed between the movable plate and the movable frame.

[0013] In one embodiment of the present invention, the left and right sidewalls of the movable frame are provided with strip-shaped holes, friction blocks are slidably connected in the strip-shaped holes, a movable block is fixedly installed between the two friction blocks, a first hydraulic cylinder is fixedly installed on the inner side of the lower end of the movable frame, and a second hydraulic cylinder is fixedly installed on the inner side of the left and right sides of the upper end of the movable frame, and an oil pipe is fixedly installed between the second hydraulic cylinder and the first hydraulic cylinder.

[0014] In one embodiment of the present invention, the drive rod of the first hydraulic cylinder passes through the upper sidewall of the moving block and the moving frame in sequence, and is fixedly connected to the lower end of the moving plate. The drive end of the second hydraulic cylinder is fixedly connected to the moving block, and a return spring is sleeved on the outer wall of the drive end.

[0015] Another object of the present invention is to provide a trolley for hanging fabric under a greenhouse, including the aforementioned connecting hanger.

[0016] Compared with existing technologies, the beneficial effects of this invention are reflected in: When the fabric trolley reciprocates and generates high-frequency vibration, friction and sliding occur between the friction ring and the alloy steel sheet, which converts the vibration kinetic energy that would have been transmitted to the space frame nodes into heat energy and dissipates it. This significantly reduces the stress amplitude at the connection nodes, thereby effectively suppressing the initiation and propagation of fatigue cracks at the pin hole edge and weld, and solving the fracture problem caused by long-term reciprocating motion. This lifting device not only protects itself but also cuts off the transmission path of vibration energy to the main space frame, significantly reducing the fatigue stress level of the chords and ball joints of the large-span space frame, delaying the fatigue aging process of the main steel structure, avoiding chain reactions or even collapse accidents caused by the failure of local connecting parts, and greatly improving the safety level of the entire fabric storage device. Attached Figure Description

[0017] Figure 1 This is a front view of the existing fabric hanging trolley under the greenhouse; Figure 2 This is a front view of the overall structure of the present invention; Figure 3 This is a side view of the overall structure of the present invention; Figure 4 This is a schematic diagram showing the connection between the buffer component, the friction damping component, and the connecting rod of the present invention; Figure 5 This is a first left view of the buffer component and friction damping component of the present invention; Figure 6 This is a right view of the buffer component and friction damping component of the present invention; Figure 7 This is a second left view of the buffer component and friction damping component of the present invention; Figure 8 This is a schematic diagram of the unfolded structure of the buffer component of the present invention; Figure 9 This is a bottom view of the buffer component and friction damping component of the present invention; Figure 10 This is a schematic diagram showing the connection between the moving frame and the damper in this invention; Figure 11 This is a schematic diagram of the friction damping component structure of the present invention; Figure 12 This is a bottom view of the friction damping component of the present invention; Figure 13 This is a schematic diagram of the friction damping component of the present invention.

[0018] Explanation of icon numbers: 1. Connecting rod; 2. Fixing plate; 201. First ear plate; 3. Buffer components; 301. Upper connecting plate; 302. Lower connecting plate; 303. Side plate; 304. Top plate; 305. Connecting column; 306. Second ear plate; 307. Fixed column; 308. Ball head seat; 309. Damper; 310. Moving plate; 311. Guide rod; 312. Moving frame; 313. Strip hole; 314. Moving block; 315. Friction block; 316. Drive rod; 317. First hydraulic cylinder; 318. Second hydraulic cylinder; 319. Oil pipe; 320. Slide rod; 321. First spring; 4. Friction damping components; 401. Fixed ring; 402. Alloy steel sheet; 403. Channel; 404. Ear block; 405. Support column; 406. Second spring; 407. Mounting plate; 408. Friction ring plate; 409. Arc groove; 410. Hanging rod; 411. Sphere; 412. Rotating ball; 5. Fixed rod; 501. Track; 502. Stacker-reclaimer. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] The illustrations provided in this embodiment are only intended to illustrate the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] Please see Figures 2 to 13This invention provides a technical solution: a connecting lifting device, comprising: a track 501, the track 501 including a welded support platform and rails fixed to the support platform; a traveling stacker-reclaimer 502 is provided at the upper end of the rails for stacking and storing materials; connecting rods 1 are provided on the upper sides of both the left and right ends of the track 501; several sets of fixing plates 2 are provided and evenly fixed to the outer ends of the connecting rods 1; several sets of buffer components 3 are rotatably installed on the outer ends of each set of fixing plates 2; the buffer components 3 are used to buffer and protect the connecting rods 1, preventing damage when the material placing trolley starts and stops, accelerates and decelerates, or is impacted by materials. The high-frequency vibrations and instantaneous impacts generated will be directly transmitted to the grid nodes without any buffering. The friction damping component 4 is fixed to the end of the buffer component 3 away from the fixed plate 2. The end of the friction damping component 4 away from the buffer component 3 is fixedly installed with a fixed rod 5. The fixed rod 5 is used to fix the lower chord node of the greenhouse grid and the track 501 to fix the fabric trolley to the lower end of the greenhouse grid. The friction damping component 4 is used to absorb the vibration force transmitted to the grid. When the fabric trolley runs and generates alternating loads, the friction damping component 4 dissipates the vibration energy through frictional heat generation, thereby releasing the fatigue stress transmitted to the grid nodes.

[0022] In one embodiment, please refer to Figure 4 - Figure 10 The buffer component 3 is provided with a protective shell, which includes an upper connecting plate 301 and a lower connecting plate 302. Several side plates 303 are uniformly fixedly installed on the outer side between the upper connecting plate 301 and the lower connecting plate 302. A damper 309 is fixedly installed on the inner side of the upper connecting plate 301, and an extension component is fixedly installed on the inner end of the lower connecting plate 302. The protective shell is used to shield and protect the damper 309 and the extension component on the inner side. The damper 309 is a viscous damper, and the model is any one of VFD-NL×300×40, VFD-500×60, VFD-NL×400×30 and VFD-NL×400×50.

[0023] The buffer component 3 includes a connecting post 305 and a ball head seat 308. The connecting post 305 is fixed to the upper end of the upper connecting plate 301, and the ball head seat 308 is fixed to the lower end of the lower connecting plate 302. A top plate 304 is fixedly installed on the upper end of the connecting post 305. The top plate 304 is rotatably connected to the fixed plate 2 through a first ear plate 201 and a second ear plate 306. The second ear plate 306 is fixed to the upper end of the top plate 304, and the first ear plate 201 is fixed to the outer end of the fixed plate 2. The first ear plate 201 and the second ear plate 306 are rotatably connected by a shaft pin, so that the top plate 304 is rotatably connected to the outer end of the fixed plate 2. Several fixing posts 307 are evenly fixedly installed on the outer side of the lower end of the top plate 304. The lower ends of the fixing posts 307 slide through the side walls of the upper connecting plate 301 and the lower connecting plate 302 in sequence and are fixedly connected to the upper outer wall of the fixing ring 401, thereby fixing the fixing tube 401.

[0024] In one embodiment, please refer to Figure 4 - Figure 10 The extension assembly includes a movable plate 310 and a movable frame 312. The movable plate 310 is fixed to the output end of the damper 309. The movable plate 310 is orifice-shaped and fixed to the inner end of the lower connecting plate 302, and located directly below the damper 309. A slide rod 320 is fixedly installed at the lower end of the movable plate 310. The lower end of the slide rod 320 slides through the upper side wall of the movable frame 312 and is fixedly installed with a stop block. A first spring 321 is sleeved on the outer end of the slide rod 320. The first spring 321 is fixed between the movable plate 310 and the movable frame 312. The movable frame 312 can slide on the outer wall of the slide rod 320 by stretching or compressing the first spring 321. The stop block can limit the movement of the movable frame 312 and prevent the movable frame 312 and the slide rod 320 from separating.

[0025] The left and right sidewalls of the movable frame 312 are provided with strip-shaped holes 313. Friction blocks 315 are slidably connected in the strip-shaped holes 313. The friction blocks 315 are made of modified polytetrafluoroethylene, polyimide or copper-based powder metallurgy composite material to increase the friction between the friction blocks 315 and the strip-shaped holes 313, thereby buffering the fabric trolley. A movable block 314 is fixedly installed between the two friction blocks 315. When the movable block 314 moves, it can drive the two friction blocks 315 to move synchronously in the strip-shaped holes 313. The sliding frame 312 has a first hydraulic cylinder 317 fixedly installed on the inner side of its lower end. The inner sides of the upper left and right sides of the sliding frame 312 are each fixedly installed with a second hydraulic cylinder 318. An oil pipe 319 is fixedly installed between the second hydraulic cylinder 318 and the first hydraulic cylinder 317. The two ends of the oil pipe 319 are respectively connected to the inner ends of the first hydraulic cylinder 317 and the second hydraulic cylinder 318. The hydraulic oil in the second hydraulic cylinder 318 and the first hydraulic cylinder 317 can flow to each other through the oil pipe 319.

[0026] The drive rod 316 of the first hydraulic cylinder 317 passes through the upper sidewall of the moving block 314 and the moving frame 312 in sequence, and is fixedly connected to the lower end of the moving plate 310. The drive end of the second hydraulic cylinder 318 is fixedly connected to the moving block 314, and a return spring is sleeved on the outer wall of the drive end. One end of the return spring is fixed on the outer wall of the second hydraulic cylinder 318, and the other end is fixed on the outer wall of the moving block 314. When the drive end of the second hydraulic cylinder 318 pushes the moving block 314 to move, it stretches or compresses the return spring.

[0027] When the fabric trolley starts or stops or is impacted by materials, the fabric trolley transmits the vibration force to the moving frame 312. The upper end of the moving frame 312 slides on the slide rod 320 by squeezing or stretching the first spring 321. At the same time, the drive rod 316 moves back and forth in the first hydraulic cylinder 317, squeezing the hydraulic oil in the first hydraulic cylinder 317 back and forth into the second hydraulic cylinder 318. The output end of the second hydraulic cylinder 318 pushes the moving block 314, which carries the friction block 315, to slide in the strip hole 313 by squeezing or stretching the reset spring, thus buffering the fabric trolley. At the same time, the drive rod 316 also pulls the output end of the damper 309 to move, increasing the buffering stroke of the damper 309, effectively ensuring the buffering effect when the fabric trolley starts or stops suddenly.

[0028] In a preferred embodiment, please refer to Figure 8 and Figure 9 Several guide rods 311 are evenly fixedly installed on the lower outer side of the upper connecting plate 301. The lower end of each guide rod 311 slides through the side wall of the moving plate 310 and is fixedly installed with a limit block. When the damper 309 is working, the moving plate 310 slides on the outer wall of the several guide rods 311 to guide and limit the damper 309, thereby improving the safety of the damper 309.

[0029] In one specific embodiment, please refer to Figure 11 - Figure 13 The friction damping component 4 includes a fixed ring 401 and a rod 410. The lower end of the fixed ring 401 is fixedly connected to the fixed column 307 to fix the fixed ring 401. The lower end of the fixed ring 401 is provided with a stacked friction assembly. The stacked friction assembly has a truncated cone stacked structure. The rod 410 passes through the stacked friction assembly. In the axial direction of the rod 410, its outer diameter gradually increases or decreases. The upper end of the rod 410 passes through the stacked friction assembly and is fixedly installed with a rotating ball 412. The rotating ball 412 is rotatably connected to the inner wall of the ball head seat 308, and the three-minute portion of the rotating ball 412 is located inside the ball head seat 308, allowing the rod 410 to rotate arbitrarily at the lower end of the ball head seat 308.

[0030] The laminated friction assembly includes several alloy steel sheets 402, which are any one of silicon-manganese spring steel, chromium-vanadium spring steel, or high-carbon manganese steel, and have the characteristics of high strength and strong wear resistance. The diameter of the alloy steel sheets 402 gradually increases from top to bottom. Each alloy steel sheet 402 has an annular channel 403 in the middle. Each alloy steel sheet 402 has ear blocks 404 fixedly installed at both ends. Support columns 405 are fixedly installed on the lower sides of both ends of the fixing ring 401. The lower end of the support column 405 slides through several ear blocks 404 in sequence and is fixedly installed with baffles. Several sets of second springs 406 are evenly sleeved on the outer end of the support column 405. The second springs 406 are located between two ear blocks 404. The distance between two adjacent alloy steel sheets 402 gradually increases from top to bottom. The alloy steel sheets 402 can move in the axial direction of the rod 410 by pressing the second springs 406, so that the two adjacent alloy steel sheets 402 move closer or further apart.

[0031] Mounting plates 407 are provided between each pair of adjacent alloy steel sheets 402. The alloy steel sheets 402 and mounting plates 407 are coaxially sleeved on the outer end of the boom 410. The distance between adjacent mounting plates 407 and alloy steel sheets 402 gradually increases from top to bottom. A friction ring plate 408 is fixedly installed at the lower end of each mounting plate 407. The friction ring plate 408 is made of modified polytetrafluoroethylene or ceramic composite material. An arc groove 409 is fixedly installed in the middle of the mounting plate 407. Several spheres 411 corresponding to the arc grooves 409 are fixedly installed on the outer wall of the boom 410. The arc grooves 409 are rotatably sleeved on the outer end of the spheres 411, allowing the mounting plates 407 and friction ring plates 408 to move with the boom 410 in its axial direction and to rotate arbitrarily at the outer end of the boom 410. When the fabric trolley is running... When alternating loads are generated, the fixed rod 5 generates a vibration force on the hanger 410. The hanger 410 pulls the mounting plate 407 and the friction ring plate 408 to move between the two alloy steel plates 402. Relative shear slip occurs between the alloy steel plates 402 and the friction ring plate 408. As the vibration force on the hanger 410 increases, more alloy steel plates 402 are pulled into friction contact with the friction ring plate 408, and the area of ​​friction contact becomes larger and larger. The axial force is converted into a huge radial friction force by the truncated cone surface. The greater the load, the greater the friction force. The vibration energy is consumed by the heat generated by friction, thereby releasing the fatigue stress transmitted to the space frame node, which greatly reduces the stress amplitude at the connection node. It can effectively suppress the initiation and propagation of fatigue cracks at the pin hole edge and weld, and solve the fracture problem caused by long-term reciprocating motion.

[0032] The dry friction damping of friction ring plate 408 and alloy steel plate 402 can provide stable energy dissipation capability under low-frequency impact during the start and stop of the car and high-frequency flutter during operation.

[0033] In a preferred embodiment, the shape of the friction ring plate 408 is adapted to the mounting plate 407. The alloy steel sheet 402 has a spiral groove or concentric annular groove machined on one end face near the friction ring plate 408. The surface of the friction ring plate 408 is provided with protrusions or textures that cooperate with the grooves. When relative slippage occurs, the spiral groove guides the wear particles to be discharged from the contact area and maintains the stability of the friction coefficient between the friction ring plate 408 and the alloy steel sheet 402.

[0034] This invention also proposes a fabric hanging trolley for greenhouses, including a connecting hanger. The specific structure of the connecting hanger is as described in the above embodiments. Since this fabric hanging trolley for greenhouses adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The connecting hanger connects the fabric trolley to the grid node of the greenhouse.

[0035] When this device is working, the high-frequency vibration and instantaneous impact force generated by the fabric trolley during start-up, acceleration, deceleration, or impact by materials are transmitted to the fixed rod 5 and the suspension rod 410. The suspension rod 410 transmits the force to the buffer component 3. The buffer component 3 buffers the force transmitted by the suspension rod 410 through displacement. At the same time, the suspension rod 410 moves in the axial direction along with the mounting plate 407 and friction ring 408. The friction ring 408 contacts and rubs against the alloy steel sheet 402. The greater the high-frequency vibration and instantaneous impact force generated by the fabric trolley, the greater the friction force, thereby releasing the fatigue stress transmitted to the grid node.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A connecting lifting device, comprising: The track (501) is equipped with a traveling stacker-reclaimer (502) at its upper end. The track (501) is characterized in that a connecting rod (1) is provided on the upper side of both the left and right ends of the track (501). The buffer component (3) is rotatably connected to the outer end of the connecting rod (1) via the fixing plate (2). The buffer component (3) is used to buffer and protect the connecting rod (1). The friction damping component (4) is fixed at one end of the buffer component (3) away from the fixed plate (2). A fixed rod (5) is fixedly installed at the end of the friction damping component (4) away from the buffer component (3). The fixed rod (5) is used to fix and connect with the lower chord node of the greenhouse frame and the track (501). The friction damping component (4) is used to absorb the vibration force transmitted to the frame.

2. The connecting lifting device according to claim 1, characterized in that, The buffer component (3) is provided with a protective shell, and a ball head seat (308) is fixedly provided at the lower end of the protective shell. The protective shell includes an upper connecting plate (301) and a lower connecting plate (302). Several side plates (303) are uniformly fixedly installed on the outer side between the upper connecting plate (301) and the lower connecting plate (302). A damper (309) is fixedly installed on the inner side of the upper connecting plate (301), and an extension component is fixedly installed at the inner end of the lower connecting plate (302).

3. The connecting lifting device according to claim 2, characterized in that, The friction damping component (4) includes a fixed ring (401) and a rod (410). The lower ends of the fixed ring (401) and the fixed column (307) are fixedly connected. The lower end of the fixed ring (401) is provided with a stacked friction assembly. The stacked friction assembly has a truncated cone stacked structure. The upper end of the rod (410) passes through the stacked friction assembly and is fixedly installed with a rotating ball (412). The rotating ball (412) is rotatably connected to the inner wall of the ball head seat (308).

4. The connecting lifting device according to claim 3, characterized in that, The stacked friction assembly includes several alloy steel sheets (402), the diameter of which gradually increases from top to bottom, and the distance between two adjacent alloy steel sheets (402) gradually increases from top to bottom. Each alloy steel sheet (402) has an annular channel (403) in the middle. Each alloy steel sheet (402) has ear blocks (404) fixedly installed at both ends. Support columns (405) are fixedly installed on the lower sides of both ends of the fixing ring (401). The lower end of the support column (405) slides through several ear blocks (404) and is fixedly installed with a baffle. Several sets of second springs (406) are uniformly sleeved on the outer end of the support column (405). The second springs (406) are located between two ear blocks (404).

5. The connecting lifting device according to claim 4, characterized in that, An mounting plate (407) is provided between each pair of adjacent alloy steel sheets (402). The alloy steel sheets (402) and the mounting plates (407) are coaxially sleeved on the outer end of the rod (410). The distance between adjacent mounting plates (407) and alloy steel sheets (402) gradually increases from top to bottom. A friction ring plate (408) is fixedly installed at the lower end of each mounting plate (407). An arc groove (409) is fixedly installed in the middle part of the mounting plate (407).

6. The connecting lifting device according to claim 5, characterized in that, A number of spheres (411) with corresponding arc grooves (409) are fixedly installed on the outer wall of the rod (410), and the arc grooves (409) are rotatably sleeved on the outer end of the spheres (411).

7. The connecting lifting device according to claim 2, characterized in that, The buffer component (3) includes a connecting column (305), which is fixed to the upper end of the upper connecting plate (301). A ball head seat (308) is fixedly installed at the lower end of the lower connecting plate (302). A top plate (304) is fixedly installed at the upper end of the connecting column (305). The top plate (304) is rotatably connected to the fixing plate (2) through a first ear plate (201) and a second ear plate (306). Several fixing columns (307) are evenly fixedly installed on the outer side of the lower end of the top plate (304). The lower end of the fixing column (307) slides through the side walls of the upper connecting plate (301) and the lower connecting plate (302).

8. The connecting lifting device according to claim 2, characterized in that, The extension assembly includes a movable plate (310) and a movable frame (312). The movable plate (310) is fixed to the output end of the damper (309). The movable plate (310) is orifice-shaped and fixed to the inner end of the lower connecting plate (302). A slide rod (320) is fixedly installed at the lower end of the movable plate (310). The lower end of the slide rod (320) slides through the upper end of the movable frame (312) and is fixedly installed with a stop block. A first spring (321) is sleeved on the outer end of the slide rod (320). The first spring (321) is fixed between the movable plate (310) and the movable frame (312).

9. The connecting lifting device according to claim 8, characterized in that, The left and right sidewalls of the movable frame (312) are provided with strip holes (313), friction blocks (315) are slidably connected in the strip holes (313), and a movable block (314) is fixedly installed between the two friction blocks (315). A first hydraulic cylinder (317) is fixedly installed on the inner side of the lower end of the movable frame (312), and a second hydraulic cylinder (318) is fixedly installed on the inner side of the left and right sides of the upper end of the movable frame (312). An oil pipe (319) is fixedly installed between the second hydraulic cylinder (318) and the first hydraulic cylinder (317).

10. The connecting lifting device according to claim 9, characterized in that, The drive rod (316) of the first hydraulic cylinder (317) passes through the upper side wall of the moving block (314) and the moving frame (312) in sequence, and is fixedly connected to the lower end of the moving plate (310). The drive end of the second hydraulic cylinder (318) is fixedly connected to the moving block (314), and a return spring is sleeved on the outer wall of the drive end.

11. A fabric-hanging cart under a greenhouse, characterized in that, Includes the connecting lifting device as described in any one of claims 1 to 10.

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