Flexible chain lifting mechanism

Abstract

The invention discloses a flexible chain lifting mechanism which comprises a rack and an object carrying platform, chain wheel sets are arranged on the two sides of the object carrying platform respectively, each chain wheel set comprises at least two chain wheels, chains are arranged on the two sides, corresponding to the object carrying platform, of the rack respectively, and the chain wheels are connected with the chains. The chain and at least one chain wheel in one chain wheel set are meshed on the upper side of the chain wheel, the chain and at least one chain wheel in one chain wheel set are meshed on the lower side of the chain wheel, and the upper end and the lower end of the chain are connected to the top and the bottom of the machine frame respectively. The carrying platform is provided with a driving mechanism used for driving the chain wheels to rotate, and the chain wheels drive the carrying platform to ascend and descend when rotating. The lifting mechanism is good in lifting stability, small in chain tension requirement, not prone to abrasion and easy to maintain.

Description

Technical Field

[0001] The invention relates to a chain lifting mechanism and belongs to the technical field of lifting equipment. Background Art

[0002] The lifting mechanism is a kind of equipment in the lifting equipment that transports up and down. It is used to raise or lower the goods on the conveyor belts at different heights in the logistics sorting line, and to carry out vertical reciprocating in and out of the warehouse to achieve the purpose of large-scale production and automated logistics transportation. The existing chain sprocket lifter is mainly composed of a motor, a reducer, gears, chains, sprockets, and guide devices. Its principle is that after the motor is started, it drives the reducer to output low-speed and high-torque power, and then drives the sprocket to rotate. The sprockets cooperate with the chain to transmit motion to achieve lifting and lowering. Its main disadvantages include: Poor transmission stability: The traditional single-chain sprocket chain transmission has relatively poor stability and is prone to vibration and impact, which may affect the stability and accuracy of the lifting mechanism.

[0003] Difficult maintenance: The chain and wheels inside the sprocket chain transmission mechanism are prone to dust and oil, and are difficult to clean and maintain. Long-term lack of maintenance may cause the chain to get stuck or break, affecting the normal operation of the equipment.

[0004] Easy to wear: The sprocket chain will continue to wear during the transmission process, causing the chain pitch to become larger and even the chain may be off. This will not only affect the transmission efficiency, but also increase the cost of maintenance and replacement of the chain. Summary of the invention

[0005] In view of the above-mentioned defects in the prior art, the task of the present invention is to provide a flexible chain lifting mechanism to solve the problems of poor stability and easy wear of the chain sprocket lifting machine.

[0006] The technical solution of the present invention is as follows: a flexible chain lifting mechanism comprises a frame and a loading platform, sprocket groups are respectively provided on both sides of the loading platform, each of the sprocket groups comprises at least two sprockets, chains are respectively provided on the frame corresponding to the two sides of the loading platform, the chain is meshed with at least one sprocket in one of the sprocket groups on the upper side of the sprocket and the chain is meshed with at least one sprocket in one of the sprocket groups on the lower side of the sprocket, the upper and lower ends of the chain are respectively connected to the top and bottom of the frame, the loading platform is provided with a driving mechanism for driving the sprocket to rotate, and the sprocket drives the loading platform to rise and fall when it rotates.

[0007] In order to further improve the transmission stability and balance the force when the loading platform is raised or lowered, the sprocket group includes a first sprocket, a second sprocket, a third sprocket and a fourth sprocket, and the frame is provided with a first chain and a second chain corresponding to each side of the loading platform, the first chain is engaged with the upper side of the first sprocket and the lower side of the second sprocket, the second chain is engaged with the lower side of the third sprocket and the upper side of the fourth sprocket, the first sprocket and the third sprocket are arranged close to the front side of the loading platform, and the second sprocket and the fourth sprocket are arranged close to the rear side of the loading platform.

[0008] Further, the first sprocket and the third sprocket are coaxially arranged, and the second sprocket and the fourth sprocket are coaxially arranged.

[0009] Furthermore, the axles of the first sprocket, the second sprocket, the third sprocket and the fourth sprocket are in the same horizontal plane.

[0010] Furthermore, the chain is arranged in an N shape or an inverted N shape.

[0011] Furthermore, guide members are provided on both the front and rear sides of the loading platform, and vertical guide rails are provided on the frame, and the guide members match the vertical guide rails.

[0012] Furthermore, the vertical guide rail is provided with a T-shaped slot, and the guide member is a T-shaped convex strip matching the T-shaped slot.

[0013] Furthermore, the frame is provided with a limit platform, and the loading platform is provided with a telescopic limit mechanism, and when the telescopic limit mechanism contacts the top surface of the limit platform, the loading platform is restricted from moving downward.

[0014] Furthermore, the telescopic limiting mechanism includes a gear and a rack, the rack is meshed with the gear, the rack is horizontally arranged and slidingly matched with the loading platform, and the rack contacts the top surface of the limiting platform when extending from the side of the loading platform.

[0015] Furthermore, a plurality of the limiting platforms are arranged at intervals in the vertical direction of the frame.

[0016] The advantages of the present invention compared with the prior art are: The present invention adopts a sprocket group composed of a sprocket meshed with the chain on the upper side and a sprocket meshed with the chain on the lower side, which has a small demand for the tension force of the chain, good running stability, small pressure and wear on the bearing, long service life, and reduces working noise. In the sprocket group on one side, two pairs of sprockets are formed in two directions (i.e., a pair of the first sprocket and the second sprocket, and a pair of the third sprocket and the fourth sprocket), so that the front and rear sides of the loading platform are more balanced in force, and the stability is further improved. In particular, when the first sprocket and the third sprocket are coaxially arranged and the second sprocket and the fourth sprocket are coaxially arranged, the best stabilizing effect can be obtained, and the four chains and eight sprockets cooperate with each other to constrain the synchronous transmission, so that the efficiency is high, the power is high, the load capacity is strong, heavier objects can be transported, and the force distribution is more uniform. The flexible chain lifting mechanism of the present invention simplifies the structure, has a compact structure, occupies less space, and reduces costs and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the flexible chain lifting mechanism of the embodiment.

[0018] Figure 2 Schematic diagram of the frame structure of the flexible chain lifting mechanism of the embodiment.

[0019] Figure 3 It is a schematic diagram of the loading platform structure of the flexible chain lifting mechanism of the embodiment.

[0020] Figure 4 Schematic diagram of the loading platform structure of the flexible chain lifting mechanism of the embodiment (bottom perspective).

[0021] Figure 5 It is a structural diagram of the coordination between the sprocket set and the chain.

[0022] Figure 6 It is a structural schematic diagram of the telescopic limiting mechanism of the loading platform. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the embodiments, but are not intended to be limiting of the present invention.

[0024] Please combine Figures 1 to 5 As shown, a flexible chain lifting mechanism involved in this embodiment includes a frame 1 and a loading platform 2. The frame 1 is mainly composed of a base 101, a load-bearing column 102 and a crossbeam 103. The load-bearing columns 102 are welded on the four corners of the base 101 to provide support, and the tops of the four load-bearing columns 102 are connected by crossbeams 103 to form a rectangular frame structure.

[0025] The loading platform 2 is located between the four load-bearing columns 102. The loading platform 2 is used to carry articles. A sprocket set is arranged on the left and right sides of the loading platform 2. Each sprocket set is composed of four sprockets, namely, the first sprocket 201, the second sprocket 202, the third sprocket 203 and the fourth sprocket 204. The first sprocket 201 and the third sprocket 203 are arranged on the front wheel shaft 205, and the second sprocket 202 and the fourth sprocket 204 are arranged on the rear wheel shaft 206. The front wheel shaft 205 and the rear wheel shaft 206 are both installed on the mounting side walls 207 on both sides of the bottom surface of the loading platform 2 through bearings. A driving mechanism is also installed on the bottom surface of the loading platform 2. The driving mechanism is used to drive the front wheel shaft 205 and the rear wheel shaft 206 to rotate, and then the first sprocket 201, the second sprocket 202, the third sprocket 203 and the fourth sprocket 204 are driven to rotate through the rotation of the front wheel shaft 205 and the rear wheel shaft 206.

[0026] The driving mechanism includes a motor 208 and a reduction gear set, and a driving gear 209 meshing with the gears in the reduction gear set is respectively installed on the output shaft of the motor 208, the front wheel shaft 205 and the rear wheel shaft 206. Through the operation of the motor 208, the first sprocket 201, the second sprocket 202, the third sprocket 203 and the fourth sprocket 204 are rotated through the deceleration and torque increase of the reduction gear set. In this embodiment, the front wheel shaft 205 and the rear wheel shaft 206 are driven separately, so two motors and two reduction gear sets are provided.

[0027] A chain is arranged on the frame 1 for meshing with each sprocket in the sprocket group, and when each sprocket rotates, the loading platform 2 is lifted and lowered. The matching structure of the sprocket groups and chains on the left and right sides of the loading platform 2 is symmetrical, so the structure of one side is described below.

[0028] As mentioned above, a sprocket set includes a first sprocket 201, a second sprocket 202, a third sprocket 203 and a fourth sprocket 204, and the axles of the first sprocket 201, the second sprocket 202, the third sprocket 203 and the fourth sprocket 204 (i.e., the front axle 205 and the rear axle 206) are in the same horizontal plane. The chain includes two, a first chain 3 and a second chain 4, the upper ends of the first chain 3 and the second chain 4 are connected to the crossbeam 103 of the frame 1, and the lower ends of the first chain 3 and the second chain 4 are connected to the base 101 of the frame 1. The upper end of the first chain 3 is connected to a position close to the rear side of the frame 1, the lower end of the first chain 3 is connected to a position close to the front side of the frame 1, the upper end of the second chain 4 is connected to a position close to the front side of the frame 1, and the lower end of the second chain 4 is connected to a position close to the rear side of the frame 1. The first chain 3 is respectively wound around the upper side of the first sprocket 201 and the lower side of the second sprocket 202 to form an N shape, while the second chain 4 is respectively wound around the lower side of the third sprocket 203 and the upper side of the fourth sprocket 204 to form an inverted N shape. In this way, the left and right sides of the loading platform 2 form a four-link coupled lifting mechanism with four chains and eight sprockets. The four-link coupled lifting mechanism is symmetrical in both left and right directions and front and back directions, so it can achieve the best force balance.

[0029] Similar to the prior art, the flexible chain lifting mechanism is also provided with a vertical guide mechanism to ensure the running direction of the loading platform. In this embodiment, it specifically includes a vertical guide rail 104 and a guide member 210, wherein the vertical guide rail 104 has a T-shaped slot, and the vertical guide rail 104 is fixedly installed on the front and rear sides of the frame 1, and the top and bottom ends of the vertical guide rail 104 are respectively fixedly connected to the crossbeam 103 and the base 101 of the frame 1. The guide member 210 is a T-shaped convex strip matching the T-shaped slot, and the guide member 210 is installed on the front and rear sides of the loading platform 2. The movement of the loading platform 2 is guided in the vertical direction by the cooperation of the T-shaped convex strip and the T-shaped slot, and at the same time, it can also ensure that the loading platform 2 is always in a horizontal state.

[0030] Please combine Figure 6 As shown, in order to make the loading platform 2 have a better stable position retention effect when it is lifted to a certain height position, and to increase its stability after being lifted to the right position when loaded, the flexible chain lifting mechanism of this embodiment is provided with a locking mechanism. The locking mechanism includes a limit platform 106 and a telescopic limit mechanism. A vertical limit column 107 is installed on the frame, and a laterally convex limit platform 106 is formed at different height positions on the side of the limit column 107. The number of limit columns 107 is generally not less than two, and in this embodiment, it is set to four, and two are set on the front and rear sides of the frame 1 respectively.

[0031] The loading platform 2 is provided with a telescopic limit mechanism, which specifically includes a locking motor 211, a gear 212 and a rack 213. The rack 213 meshes with the gear 212. The locking motor 211 drives the gear 212 to rotate. The rack 213 is horizontally arranged and slides with the rack guide frame 214 on the bottom surface of the loading platform 2. When the locking motor 211 rotates, the rack 213 is driven by the gear 212 to extend and retract. When the rack 213 extends from the side of the loading platform 2, it contacts the top surface of the limit platform 106. At this time, the limit platform 106 limits the downward movement of the loading platform 2, which ensures the stability of the loading platform 2 at this height position and prevents accidental falling. If a plurality of limit platforms 106 are arranged at different heights, the loading platform 2 can be stably supported at different height positions.

Claims

1. A flexible chain lifting mechanism, comprising a frame and a loading platform, characterized in that: Sprocket groups are respectively provided on both sides of the loading platform, each of the sprocket groups includes at least two sprockets, and chains are respectively provided on the frame corresponding to the two sides of the loading platform, the chain is meshed with at least one sprocket in one of the sprocket groups on the upper side of the sprocket and the chain is meshed with at least one sprocket in one of the sprocket groups on the lower side of the sprocket, the upper and lower ends of the chain are respectively connected to the top and bottom of the frame, and the loading platform is provided with a driving mechanism for driving the sprocket to rotate, and the sprocket drives the loading platform to rise and fall when it rotates.

2. The flexible chain lifting mechanism according to claim 1, characterized in that: The sprocket group includes a first sprocket, a second sprocket, a third sprocket and a fourth sprocket. The frame is provided with a first chain and a second chain corresponding to each side of the loading platform. The first chain is engaged with the upper side of the first sprocket and the lower side of the second sprocket, the second chain is engaged with the lower side of the third sprocket and the upper side of the fourth sprocket, the first sprocket and the third sprocket are arranged close to the front side of the loading platform, and the second sprocket and the fourth sprocket are arranged close to the rear side of the loading platform.

3. The flexible chain lifting mechanism according to claim 2, characterized in that: The first sprocket and the third sprocket are coaxially arranged, and the second sprocket and the fourth sprocket are coaxially arranged.

4. The flexible chain lifting mechanism according to claim 2, characterized in that: The wheel axles of the first sprocket, the second sprocket, the third sprocket and the fourth sprocket are in the same horizontal plane.

5. The flexible chain lifting mechanism according to claim 2, characterized in that: The chain is arranged in an N shape or an inverted N shape.

6. The flexible chain lifting mechanism according to claim 1, characterized in that: The front and rear sides of the loading platform are both provided with guide pieces, the frame is provided with vertical guide rails, and the guide pieces match the vertical guide rails.

7. The flexible chain lifting mechanism according to claim 6, characterized in that: The vertical guide rail is provided with a T-shaped slot, and the guide piece is a T-shaped convex strip matching the T-shaped slot.

8. The flexible chain lifting mechanism according to claim 1, characterized in that: The frame is provided with a limit platform, and the loading platform is provided with a telescopic limit mechanism. When the telescopic limit mechanism contacts the top surface of the limit platform, the loading platform is restricted from moving downward.

9. The flexible chain lifting mechanism according to claim 8, characterized in that: The telescopic limiting mechanism includes a gear and a rack, the rack is meshed with the gear, the rack is horizontally arranged and slidably matched with the loading platform, and the rack contacts the top surface of the limiting platform when extending from the side of the loading platform.

10. The flexible chain lifting mechanism according to claim 8, characterized in that: A plurality of the limiting platforms are arranged at intervals in the vertical direction of the frame.

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