CN210339465U - A cargo lifting mechanism - Google Patents

Abstract

The utility model discloses a goods jacking mechanism, which comprises a lifting frame, a circulating feeding mechanism arranged on the lifting frame and a vertical driving mechanism for driving the lifting frame to move vertically; the circulating feeding mechanism comprises a plurality of feeding pieces with circulating structures and a feeding driving mechanism for driving the feeding pieces to move circularly; the crane comprises a first lifting plate and a second lifting plate which are oppositely arranged, and the vertical driving mechanism comprises a power source component, four driving structures and a transmission mechanism, wherein the power source component is arranged on the rack and used for outputting power, and the transmission mechanism transmits the power of the power source component to the driving structures so as to enable the four driving structures to synchronously move. The utility model provides the high motion stability of crane for the goods stops in the optional position of lifter plate, and the homoenergetic can be steadily rebound, thereby is favorable to the goods to carry out subsequent transfer and transport.

Description

A cargo lifting mechanism

technical field

The utility model relates to a cargo transportation device, in particular to a cargo jacking mechanism.

Background technique

In the field of goods conveying lines, the conveying of goods is generally realized by means of double-speed chains or conveying rollers. Although the double-speed chain or conveying roller will cause the goods to jump to a certain extent, it can make the goods move at any angle, thereby increasing the moving direction of the goods for the purpose of conveying the goods. However, when the goods need to be conveyed at right angles, due to the large turning angle, the stability of the goods moving on the double-speed chain or conveyor rollers at the corners is greatly reduced, and the vibration is obvious, resulting in easy damage to the goods. In order to solve the stability of the goods when the goods are conveyed by turning, the general practice is to use two mutually perpendicular conveyor chains, and set up a jacking mechanism at the end of one of the conveyor chains. When the goods move to the end of the conveyor chain, the jacking mechanism The goods are jacked up and separated from the conveyor chain, and then the goods are transferred from the jacking mechanism to another conveyor chain through the conveyor belt, so as to complete the transfer of the goods on the two conveyor chains, and finally realize a ninety-degree turn of the goods For conveying, for example, the utility model patent with the authorized announcement number of CN207046311U "A Lifting Positioning Conveying Mechanism".

However, when the goods move on the conveyor chain, the position of the goods is not uniform when they are loaded, or the position moves due to vibration during the conveying process, so that the goods cannot be guaranteed to be located in the center when they move to the jacking mechanism; while on the market The general jacking mechanism is driven by a vertical driving mechanism (such as a cylinder) to drive the lifting plate to move up and down, and the power output point of the vertical driving mechanism is connected to the center of the lifting plate. Therefore, when the goods are located in the lifting plate of the jacking mechanism At the edge, the stability of the lifting of the goods is obviously reduced, which is not conducive to the accurate lifting of the goods to the designated position, thus affecting the subsequent handling or transfer.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a cargo jacking mechanism, which can stably jack up the cargo, ensure the smooth transfer of the cargo, and help improve the conveying speed of the cargo.

The purpose of the present utility model is achieved through the following technical solutions:

A cargo jacking mechanism is characterized in that it includes a lifting frame, a circulating feeding mechanism arranged on the lifting frame, and a vertical driving mechanism that drives the lifting frame to move vertically; wherein, the circulating feeding mechanism includes several A feeding member with a circulating structure and a feeding driving mechanism for driving the feeding member to circulate; the lifting frame includes a first lifting plate and a second lifting plate arranged oppositely, and the vertical driving mechanism includes a frame arranged on the frame for outputting power a power source member, four driving structures for directly driving the lifting frame to rise and fall, and a transmission mechanism that transmits the power of the power source member to the driving structure to promote the synchronous movement of the four driving structures; two of the four driving structures It is arranged on the first lifting plate and the second lifting plate, and the two driving structures on the first lifting plate and the two driving structures on the second lifting plate are oppositely arranged.

The working principle of the above cargo jacking mechanism is:

The cargo lifting mechanism of the utility model is arranged between the ends of two mutually perpendicular conveying chains, and the moving direction of the feeding member of the circulating feeding mechanism is the same as the conveying direction of the conveying chain after the goods are transferred.

The goods move on the conveyor chain before the transfer. When the goods move to the end of the conveyor chain and transition to the top of the feeder on the lifting frame, the power source member of the vertical drive mechanism transmits the power to the conveyor through the transmission mechanism. In the four driving structures, the first lifting plate and the second lifting plate are driven to move upward, so that the goods are supported on the feeding member and move upward, and are separated from the conveyor chain before the transfer; at the same time, the feeding driving mechanism drives the feeding member to circulate. Movement, the goods on the feeding piece are transported forward, so as to transition to the transferred conveyor chain, which completes the subsequent transportation of the goods and completes the transfer and transportation of the goods.

In a preferred solution of the present invention, there are two groups of transmission mechanisms of the vertical drive mechanism, two of the power source components, and the two power source components are in one-to-one correspondence with the two groups of transmission mechanisms;

Each group of transmission mechanisms is composed of a gear transmission mechanism, the gear transmission mechanism includes two transmission gears, the power source member is arranged between the two transmission gears, and two sides of the power output member of the power source member are connected to the two transmission gears. Matching connection; the four driving structures are all composed of driven lifting rods, the driven lifting rods are provided with racks that are matched and connected with the transmission gears, and the four driven lifting rods are connected with the two transmissions of the two sets of transmission mechanisms. The gears are matched and connected one by one; the two opposite transmission gears in the two sets of transmission mechanisms are both provided with synchronizing rods that make them rotate synchronously.

Preferably, the power source member is constituted by a cylinder, both sides of the telescopic piece of the cylinder are provided with a transmission rack matched with the transmission gear, and the telescopic piece of the cylinder constitutes the power output member. When working, the up and down movement of the telescopic piece is controlled by the air cylinder, so as to drive the transmission gears connected to both sides of the telescopic piece to rotate, so that the driven lifting rod drives the whole lifting frame to move up and down to realize the lifting of the goods; the way of air cylinder is adopted. The gear transmission mechanism is driven to move to realize the lifting and lowering of the lifting frame, so as to complete the lifting of the goods.

Preferably, the gear transmission mechanism further includes a transition gear, which is arranged between the transmission gear and the driven lift rod; a transition synchronization rod is provided between the corresponding transition gears in the two sets of transmission mechanisms. The arrangement of the transition gears can increase the transverse length of the entire gear transmission mechanism, so that it is convenient to drive two transmission gears to rotate at the same time through one power source member, thereby realizing the lifting and lowering drive of the lifting plate; at the same time, the transverse length of the gear transmission mechanism is increased. , thereby increasing the distance between the two driven lifting rods, thereby increasing the area of the lifting frame, making it easier for the goods to move to the feeding part of the lifting frame, so as to facilitate the transfer of the goods.

A preferred solution of the present utility model further includes two fixed plates arranged in parallel, the two fixed plates are arranged between the first lifting plate and the second lifting plate, the two ends of the synchronization rod and the transition synchronization rod are respectively Rotating connection on two fixing plates.

In a preferred solution of the present utility model, the feeding member is constituted by a belt transmission mechanism, the belt transmission mechanism includes a driving wheel, a driven wheel and a conveyor belt, and the driving wheel and the driven wheel are respectively provided with a first lifting plate and a second lifting plate Above, the conveyor belt is arranged around the driving wheel and the driven wheel, and the driving wheel is connected with the power output shaft of the feeding drive mechanism.

Preferably, there are multiple feeding parts, the first lifting plate and the second lifting plate are respectively provided with a driving shaft and a driven shaft, the driving wheels of the belt transmission mechanism are all arranged on the driving shaft, and the driving shafts of the belt transmission mechanism are arranged on the driving shaft. The driven wheels are all arranged on the driven shaft, the power output shaft of the feeding driving mechanism is connected with the driving shaft, and there are avoidance spaces between the conveyor belts of the plurality of belt transmission mechanisms. When the conveyor chain adopts conveyor rollers, the entire cargo lifting mechanism is directly arranged below the end of the conveyor chain. The conveyor belts of the transmission mechanism all pass through the gap between the conveyor rollers and rise, so as to lift the goods, and then under the drive of the feeding drive mechanism, the goods are directly conveyed to another conveyor chain. In this way, the structure of the entire conveying chain can be made more compact, the setting of the device is convenient, and the space is saved and the design is ingenious.

In a preferred solution of the present invention, a vertical guide mechanism is provided between the frame and the first lifting plate and the second lifting plate. The vertical guide mechanism includes a fixing member and a sliding member, and the fixing member is fixedly arranged. A sliding groove is arranged on the frame and on the fixing member, one side of the sliding member is fixedly arranged on the first lifting plate and the second lifting plate, and the sliding member is slidably connected in the sliding groove of the fixing member. The vertical guide mechanism is combined with the four synchronously moving drive structures to further improve the stability and accuracy of the lifting frame when moving up and down, and no local jamming occurs, thereby ensuring the stability of the movement of the goods. and efficient.

In a preferred solution of the present invention, there are four power source components and transmission mechanisms, and are connected with the four driving structures in one-to-one correspondence. The power source component is composed of a motor, the transmission mechanism is composed of a screw transmission mechanism, the screw of the screw transmission mechanism is connected with the main shaft of the motor, and the screw nut of the screw transmission mechanism is connected with the corresponding driving structure connect.

In a preferred solution of the present invention, the four driving structures are all constituted by a screw transmission mechanism, the transmission mechanism is constituted by a toothed chain transmission mechanism, and the power source member is constituted by a power motor; the screw transmission mechanism is vertical The lifting frame is connected with the screw nuts of all screw transmission mechanisms; the toothed chain transmission mechanism includes a driving gear, four driven gears and a chain, and the four driven gears are respectively arranged on the four screws. On the screw rod of the rod transmission mechanism, the driving gear is connected with the main shaft of the power motor, and the chain is wound around the driving gear and the four driven gears.

Compared with the prior art, the utility model has the following beneficial effects:

By setting four driving structures that directly drive the lifting frame to move vertically, and under the action of the transmission mechanism, the four driving structures move synchronously, so that the entire lifting frame has four stable power output points, and the movement stability of the lifting frame is improved. Therefore, the goods can stay at any position of the lifting plate and can move upwards stably, which is beneficial to the subsequent transfer and transportation of the goods.

Description of drawings

1-2 are schematic structural diagrams of the first specific embodiment of the cargo jacking mechanism of the present invention, wherein, FIG. 1 is a front view (fixing plate is not shown), and FIG. 2 is a top view (feeding drive mechanism is not shown) .

FIG. 3 is a top view of FIG. 2 after omitting the transfer conveying mechanism and the fixed connecting plate.

4 is a schematic top view of the use state of the cargo jacking mechanism of the present invention.

FIG. 5 is a schematic top view of the structure of the third specific embodiment of the cargo jacking mechanism of the present invention.

Fig. 6 is a schematic top view of the structure of the fourth specific embodiment of the cargo jacking mechanism of the present invention.

Detailed ways

The present utility model will be further described below with reference to the embodiments and the accompanying drawings, but the embodiments of the present utility model are not limited thereto.

Example 1

1-3, the cargo jacking mechanism of this embodiment includes a lifting frame, a circulating feeding mechanism arranged on the lifting frame, and a vertical driving mechanism that drives the lifting frame to move vertically; wherein, the circulating feeding mechanism The feeding mechanism includes a number of feeding parts with a circulation structure and a feeding driving mechanism that drives the feeding parts to circulate; A power source member on the frame for outputting power, four driving structures for directly driving the lifting frame to rise and fall, and a transmission mechanism for transmitting the power of the power source member to the driving structure to promote the synchronous movement of the four driving structures; The four driving structures are disposed on the first lifting plate 1 and the second lifting plate 24 two by two, and the two driving structures on the first lifting plate 1 and the two driving structures on the second lifting plate 24 are oppositely arranged.

1-3, there are two groups of transmission mechanisms of the vertical drive mechanism, two power source components, and the two power source components correspond to the two groups of transmission mechanisms one-to-one;

Each group of transmission mechanisms is composed of a gear transmission mechanism, the gear transmission mechanism includes two transmission gears 14, the power source member is arranged between the two transmission gears 14, and the two sides of the power output member of the power source member are connected to the two transmission gears 14. The transmission gear 14 is matched and connected; the four drive structures are all composed of driven lifting rods 6, and the driven lifting rod 6 is provided with a rack that is matched with the transmission gear 14, and the four driven lifting rods 6 are connected with the two The two transmission gears 14 of the group transmission mechanism are matched and connected one by one; a synchronization rod 5 is provided between the corresponding transmission gears 14 in the two groups of transmission mechanisms. Through the setting of the synchronizing rod 5, the synchronization of the two sets of transmission mechanisms is ensured, so that the four driving structures drive the lifting frame to move up and down synchronously, so that all parts of the lifting frame are subjected to uniform driving force, and under the action of eccentric load, it can also ensure The lifting frame performs the lifting movement accurately to ensure the horizontal accuracy of the lifting frame.

Referring to FIGS. 1 to 3 , the power source component in this embodiment is composed of a cylinder. Both sides of the telescopic 12 of the cylinder are provided with transmission racks matching the transmission gear 14 , and the telescopic piece 12 of the cylinder constitutes the power take-off. During operation, the up and down movement of the telescopic piece 12 is controlled by the air cylinder, thereby driving the transmission gears 14 matched and connected on both sides of the telescopic piece 12 to rotate, so that the driven lifting rod 6 drives the whole lifting frame to move up and down to realize the lifting of the goods; The movement of the gear transmission mechanism is driven by the air cylinder to realize the lifting and lowering of the lifting frame, thereby completing the lifting of the goods, and the structure is simple.

In addition, the power source member can also be composed of a motor, and the transmission mechanism can be composed of a screw transmission mechanism. Both sides of the screw nut of the screw transmission mechanism are provided with transmission teeth matching the transmission gear 14. The lead screw of the lead screw transmission mechanism is connected with the main shaft of the motor; the lead screw is driven to rotate by the motor, so that the lead screw nut moves vertically, and drives the transmission gears 14 on both sides to rotate, finally realizing the lifting and lowering of the lifting plate.

1-3, the gear transmission mechanism further includes a transition gear 13, the transition gear 13 is arranged between the transmission gear 14 and the driven lift rod 6; There is a transition synchro lever 25. Through the arrangement of the transition gear 13, the lateral length of the entire gear transmission mechanism can be increased, so that the two transmission gears 14 are driven to rotate at the same time by one power source member, thereby realizing the lifting and lowering drive of the lifting frame; at the same time, the lateral length of the gear transmission mechanism is increased. Therefore, the distance between the two driven lifting rods 6 can be increased, and the area of the lifting frame can be increased, so that the goods can be more easily moved to the feeding member, so as to facilitate the transfer of the goods.

Referring to FIGS. 1-3 , it also includes two fixed plates 4 arranged in parallel, the fixed plates 4 constitute a part of the frame, and the two fixed plates 4 are arranged between the first lifting plate 1 and the second lifting plate 24 , the two ends of the synchronizing rod 5 and the transition synchronizing rod 25 are rotatably connected to the two fixed plates 4 respectively.

Referring to Fig. 1-Fig. 3, the feeding member is constituted by a belt transmission mechanism, which includes a driving wheel, a driven wheel and a conveying mechanism 8. The driving wheel and the driven wheel are respectively provided with a first lifting plate 1 and a second lifting plate 1. On the plate 24, the conveyor belt 8 is arranged around the driving wheel and the driven wheel, and the driving wheel is connected with the power output shaft of the feeding drive mechanism

1-3, there are a plurality of the feeding parts, the first lifting plate 1 and the second lifting plate 24 are respectively provided with a driving shaft 9 and a driven shaft 11, and the driving wheels of the belt transmission mechanism are arranged on the On the driving shaft 9, the driven wheels of the belt transmission mechanism are all arranged on the driven shaft 11, the power output shaft of the feeding driving mechanism is connected with the driving shaft 9, and the conveyor belts 8 of the multiple belt transmission mechanisms are provided with avoidance. space. When the conveyor chain adopts conveyor rollers, the entire cargo lifting mechanism is directly arranged below the end of the conveyor chain. The conveyor belts 8 of the transmission mechanism all pass through the gap between the conveyor rollers and rise, so as to lift the goods, and then under the drive of the feeding drive mechanism, the goods are directly conveyed to another conveyor chain. In this way, the structure of the entire conveying chain can be made more compact, the setting of the device is convenient, and the space is saved and the design is ingenious.

The feeding drive mechanism can be composed of a motor and a toothed chain transmission mechanism. The toothed chain transmission mechanism includes a driving transmission wheel connected with the main shaft of the motor, a driven transmission wheel connected with the driving shaft 9, and a driven transmission wheel arranged around the driving transmission wheel and the driven transmission wheel. transmission chain between.

Referring to FIGS. 1-3 , a vertical guide mechanism is provided between the fixing plate 4 and the first lifting plate 1 and the second lifting plate 24 . The vertical guiding mechanism includes a fixing member 3 and a sliding member 2 . The The fixing member 3 is fixedly arranged on the fixing plate 4 and the fixing member 3 is provided with a sliding groove, one side of the sliding member 2 is fixedly arranged on the first lifting plate 1 and the second lifting plate 24, and the sliding member 2 is slidably connected in the sliding groove of the fixture 3. The arrangement of the vertical guide mechanism is beneficial to improve the moving accuracy and stability of the lifting plate, and is combined with the four synchronously moving driving structures to further improve the stability and accuracy of the lifting frame when moving up and down, and will not Local jamming occurs, thereby ensuring stable and efficient movement of goods.

Referring to FIGS. 1-3 , a fixed connecting plate 10 is provided below the conveyor belt 8 , and the connecting plate 10 constitutes a part of the frame. The cylinder block 7 of the air cylinder is fixedly arranged at the bottom of the fixed connecting plate 10 . The installation of the fixed connecting plate 10 facilitates the fixing of the cylinder. At the same time, when the goods are too heavy and the conveyor belt 8 is too deformed, the fixed connecting plate 10 can support the goods and ensure the normal transfer and transportation of the goods.

Referring to Figures 1 to 4, the working principle of the cargo jacking mechanism of this embodiment is as follows:

The cargo jacking mechanism of the present invention is arranged between the ends of two mutually perpendicular conveyor chains, and the moving direction of the feeding member of the circulating feeding mechanism is the same as the conveying direction of the conveyor chain 16 after the cargo is transferred.

The goods move on the conveyor chain 15 before the transfer. When the goods move to the end of the conveyor chain 15, the power source member of the vertical drive mechanism transmits power to the four drive structures through the transmission mechanism, thereby driving the first The first lifting plate 1 and the second lifting plate 24 move upward, so that the goods are supported on the feeding member and move upward, and are separated from the conveyor chain 15 before the transfer; The goods are transported forward, so as to transition to the conveying chain 16 after the transfer, and the subsequent conveying of the goods is completed by the conveying chain 16, and the transfer and conveying of the goods is completed.

Example 2

The difference between this embodiment and Embodiment 1 is that there are four power source components and transmission mechanisms, and they are connected with the four driving structures in one-to-one correspondence. The power source component is composed of a motor, the transmission mechanism is composed of a screw transmission mechanism, the screw of the screw transmission mechanism is connected with the main shaft of the motor, and the screw nut of the screw transmission mechanism is connected with the corresponding driving structure Connection; the power source member can also be constituted by a linear drive mechanism such as an air cylinder.

Example 3

Referring to FIG. 5 , the difference between this embodiment and Embodiment 1 is that the four driving structures are all composed of a screw transmission mechanism, the transmission mechanism is composed of a toothed chain transmission mechanism, and the power source member is composed of a power motor The screw transmission mechanism is arranged vertically, and the lifting frame is connected with the screw nuts of all screw transmission mechanisms; the toothed chain transmission mechanism includes a driving gear 17, four driven gears 18 and a chain 19, so The four driven gears 18 are respectively arranged on the screw rods of the four screw transmission mechanisms, the driving gear 17 is connected with the main shaft of the power motor, and the chain 19 is wrapped around the driving gear 17 and the four driven gears 18. .

Example 4

Referring to FIG. 6 , the difference between this embodiment and Embodiment 1 is that there are two power source components, both of which are motors 20 ; there are two transmission mechanisms, which are formed by a toothed chain transmission mechanism. The toothed chain transmission mechanism includes a driving gear 21, a driven gear 23 and a toothed chain 22, the driven gear 23 is arranged on the synchronizing rod 5 between the two transmission gears 14, and the driving gear 21 and the The main shaft of the motor 20 is connected, and the toothed chain 22 is arranged around the driving gear 21 and the driven gear 23 .

The above are the preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited by the above-mentioned contents, and any other changes, modifications, substitutions, and combinations made without departing from the spirit and principle of the present utility model , simplification, all should be equivalent replacement methods, and are all included in the protection scope of the present invention.

Claims (10)

1. A goods jacking mechanism is characterized by comprising a lifting frame, a circulating feeding mechanism arranged on the lifting frame and a vertical driving mechanism for driving the lifting frame to move vertically; the circulating feeding mechanism comprises a plurality of feeding pieces with circulating structures and a feeding driving mechanism for driving the feeding pieces to move circularly; the lifting frame comprises a first lifting plate and a second lifting plate which are oppositely arranged, and the vertical driving mechanism comprises a power source member which is arranged on the frame and used for outputting power, four driving structures which are used for directly driving the lifting frame to lift and a transmission mechanism which transmits the power of the power source member to the driving structures so as to drive the four driving structures to synchronously move; the four driving structures are arranged on the first lifting plate and the second lifting plate in a pairwise manner, and the two driving structures on the first lifting plate and the two driving structures on the second lifting plate are arranged oppositely.

2. The cargo jacking mechanism according to claim 1, wherein there are two sets of the transmission mechanisms of the vertical driving mechanism, there are two power source members, and the two power source members correspond to the two sets of the transmission mechanisms one by one;

each group of transmission mechanisms consists of a gear transmission mechanism, the gear transmission mechanism comprises two transmission gears, the power source component is arranged between the two transmission gears, and two sides of a power output part of the power source component are connected with the two transmission gears in a matching way; the four driving structures are all composed of driven lifting rods, racks matched and connected with the transmission gears are arranged on the driven lifting rods, and the four driven lifting rods are matched and connected with the transmission gears of the two groups of transmission mechanisms one by one; two opposite transmission gears in the two groups of transmission mechanisms are provided with synchronous rods for driving the two transmission gears to synchronously rotate.

3. The cargo jacking mechanism according to claim 2, wherein the power source member is constituted by a cylinder, both sides of a telescopic member of the cylinder are provided with driving racks matched with the driving gears, and the telescopic member of the cylinder constitutes the power output member.

4. The cargo jacking mechanism according to claim 2 or 3, wherein said gear transmission further comprises a transition gear disposed between the drive gear and the driven lifter; transition synchronous rods are arranged between corresponding transition gears in the two groups of transmission mechanisms.

5. The cargo jacking mechanism according to claim 4, further comprising two fixing plates arranged in parallel, wherein the two fixing plates are arranged between the first lifting plate and the second lifting plate, and two ends of the synchronizing rod and the transitional synchronizing rod are respectively and rotatably connected to the two fixing plates.

6. The cargo jacking mechanism as recited in claim 1, wherein the feeding member is formed by a belt transmission mechanism, the belt transmission mechanism comprises a driving wheel, a driven wheel and a conveying belt, the driving wheel and the driven wheel are respectively arranged on the first lifting plate and the second lifting plate, the conveying belt is arranged between the driving wheel and the driven wheel in a surrounding manner, and the driving wheel is connected with a power output shaft of the feeding driving mechanism.

7. The cargo jacking mechanism as claimed in claim 6, wherein the plurality of feeding members are provided, the first lifting plate and the second lifting plate are respectively provided with a driving shaft and a driven shaft, the driving wheels of the belt transmission mechanisms are both arranged on the driving shaft, the driven wheels of the belt transmission mechanisms are both arranged on the driven shaft, the power output shafts of the feeding driving mechanisms are connected with the driving shafts, and avoidance spaces are respectively provided between the conveyer belts of the plurality of belt transmission mechanisms.

8. The cargo jacking mechanism according to claim 1, wherein a vertical guide mechanism is arranged between the frame and the first lifting plate and the second lifting plate, the vertical guide mechanism comprises a fixed member and a sliding member, the fixed member is fixedly arranged on the frame and provided with a sliding groove, one side of the sliding member is fixedly arranged on the first lifting plate and the second lifting plate, and the sliding member is slidably connected in the sliding groove of the fixed member.

9. The cargo jacking mechanism according to claim 1, wherein there are four power source members and transmission mechanisms, and are connected to the four driving structures in a one-to-one correspondence.

10. The cargo jacking mechanism according to claim 1, wherein each of said four driving structures is constituted by a screw transmission mechanism, said transmission mechanism is constituted by a toothed chain transmission mechanism, and said power source member is constituted by a power motor; the screw rod transmission mechanisms are vertically arranged, and the lifting frames are connected with screw rod nuts of all the screw rod transmission mechanisms; the gear chain transmission mechanism comprises a driving gear, four driven gears and a chain, the four driven gears are arranged on lead screws of the four lead screw transmission mechanisms respectively, the driving gear is connected with a main shaft of the power motor, and the chain is wound on the driving gear and the four driven gears.

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