Ground cattle elevator

Abstract

The invention discloses a land cattle lifter, and relates to the technical field of lifting devices, the land cattle lifter comprises two sets of oppositely arranged racks and a roller conveying assembly, each set of rack is provided with a lifting chain, the lifting chain comprises a first chain, a second chain and a chain wheel, and the first chain is longer than the second chain; one ends of the first chain and the second chain are flush and fixedly connected with the roller conveying assembly, the other ends of the first chain and the second chain are installed on the chain wheel through a connecting piece, and the chain wheel rotates to drive the first chain and the second chain to ascend and descend synchronously. The device has a unique chain structure, is compact and simple, can drive the roller conveying assembly to sink to the ground, is high in safety, can push the tray to lift to the upper part of the rack, facilitates receiving at the upper end, and is large in lifting height range and long in stroke; the unique chain lifting winding method design can be integrated through multiple sets of lifting chains to adapt to trays of different sizes, and compatibility is good.

Description

Technical Field

[0001] The present invention belongs to the technical field of lifting devices, and particularly relates to a pallet jack lift. Background Art

[0002] With the rapid development of modern manufacturing and intelligent logistics industries, the demand for automation and high efficiency of logistics equipment is increasing day by day. As a key equipment for vertical transportation in the logistics field, the pallet jack lift is mainly used to receive pallets from the ground and lift materials to a high place, and dock with equipment such as roller conveyors to complete transportation. Its performance directly affects the efficiency, cost and safety of logistics transportation.

[0003] During the lifting process of traditional pallet jack lifts, due to design defects in the chain drive structure, such as bilateral independent drive or multi-row chain layout, the problem of chain non-synchronization is likely to occur, affecting the stability of lifting. Summary of the Invention

[0004] Aiming at the problems mentioned in the background art, the purpose of the present invention is to provide a pallet jack lift to solve the problems mentioned in the above background art.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions:

[0006] A pallet jack lift includes two sets of oppositely arranged racks and a roller conveying assembly. A lifting chain is arranged on each set of racks. The lifting chain includes a first chain, a second chain and a sprocket. The first chain is longer than the second chain. One end of the first chain and the second chain is flush and both are fixedly connected to the roller conveying assembly. The other end is installed on the sprocket through a connecting piece. The rotation of the sprocket drives the first chain and the second chain to lift synchronously.

[0007] Preferably, the ends of the first chains and the second chains of multiple sets of lifting chains are flush and installed on the roller conveying assembly.

[0008] Preferably, when the ends of the first chain and the second chain reach the highest point, the pallet on the roller conveying assembly is not lower than the rack. When the ends of the first chain and the second chain reach the lowest point, the bottom end of the roller conveying assembly is flush with the bottom end of the rack.

[0009] Preferably, the sprocket is driven by at least two sets of lifting shafts. The two sets of opposite lifting chains are synchronously driven through a transmission roller. The transmission roller is installed between two sets of lifting shafts at the same height.

[0010] Preferably, a photoelectric detection is installed on the first chain, the second chain or the sprocket of one set of lifting chains, and the output direction of the photoelectric detection faces the other set of lifting chains.

[0011] Preferably, multiple sets of horizontal pull connections are detachably installed between the two sets of racks.

[0012] Preferably, a shield is installed on the frame. The shield surrounds the frame and the lifting chain thereon, and through holes are correspondingly formed in the inner shield of the first chain and the second chain.

[0013] Preferably, the roller conveying assembly includes a driving motor, a conveying frame, and rollers. Multiple groups of rollers are arranged in parallel in the conveying frame, and the driving motor drives the rollers to rotate through a driving chain.

[0014] Preferably, the ends of the first chain and the second chain of the two groups of lifting chains are respectively installed on the two side walls of the conveying frame.

[0015] Preferably, the distance between the first chain and the second chain of the same lifting chain is greater than the length of the conveying frame, and the length direction of the conveying frame is the horizontal movement direction of the pallet.

[0016] A manual lift truck elevator proposed by the present invention has an internal transmission mode that is not easily affected by other structures, making the transmission more stable. The electrical control system has a shield for protection and low noise; the unique chain structure is compact and simple, and can drive the roller conveying assembly to sink to the ground, with high safety. It can also push the pallet above the frame for convenient upper-end receiving, with a large lifting height range and a long stroke; the unique winding design of the chain lift can also integrate multiple groups of lifting chains together to adapt to pallets of different sizes, with good compatibility.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structure diagram of the lifting chain of a manual lift truck elevator proposed by the present invention;

[0019] Figure 2 is a front view of the lifting chain of a manual lift truck elevator proposed by the present invention;

[0020] Figure 3 is a three-dimensional structure diagram of a manual lift truck elevator proposed by the present invention;

[0021] Figure 4 is a front view of a manual lift truck elevator proposed by the present invention;

[0022] Figure 5 is a top view of a manual lift truck elevator proposed by the present invention;

[0023] Figure 6 is Figure 5 a cross-sectional view taken along the direction A-A.

[0024] Figure markings: 1. Frame; 2. Lifting chain; 21. First chain; 22. Second chain; 23. Sprocket; 24. Lifting shaft; 25. Connector; 26. Lifting motor; 27. Transmission roller; 28. First gear shaft; 29. Second gear shaft; 20. Third gear shaft; 3. Horizontal pull connection; 4. Photoelectric detection; 5. Roller conveying assembly; 51. Drive motor; 52. Conveying frame; 53. Roller; 6. Protective cover. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and are not to be construed as limiting the present invention.

[0026] Example 1

[0027] refer to Figures 1 to 6 The cattle lift described in this embodiment includes two sets of frames 1, a lifting chain 2 is provided on the frame 1, and a roller conveyor assembly 5 is installed on the output end of the lifting chain 2. The two sets of frames 1 are arranged opposite to each other, and multiple sets of horizontal pull connections 3 are detachably installed between the tops of the two sets of frames 1, and the roller conveyor assembly 5 is installed between the two sets of frames 1.

[0028] The lifting chain 2 includes a first chain 21, a second chain 22 and a sprocket 23. The first chain 21 is longer than the second chain 22. The ends of the first chain 21 and the second chain 22 are flush and fixedly connected to the same side of the roller conveyor assembly 5. The other end is installed on the sprocket 23 through a connecting piece 25. The rotation of the sprocket 23 drives the first chain 21 and the second chain 22 to rise and fall synchronously.

[0029] Specifically, the lifting chain 2 includes at least two sets of lifting shafts 24, such as Figure 1 、 2 As shown, it includes two groups of lifting shafts 24, which are connected by a sprocket 23 and the sprocket 23 extends in the vertical direction. It also includes a first gear shaft 28, a second gear shaft 29 and a third gear shaft 20. The third gear shaft 20 is installed on both sides above the top lifting shaft 24, and the first gear shaft 28 is away from the second gear shaft 29. The first chain 21 and the second chain 22 extend from the connecting member 25 to bypass the third gear shaft 20 and the second gear shaft 29. The second chain 22 hangs down naturally after bypassing the second gear shaft 29, and the first chain 21 hangs down naturally after bypassing the first gear shaft 28.

[0030] Preferably, the first gear shaft 28 , the second gear shaft 29 and the third gear shaft 20 are installed at the same height.

[0031] Preferably, the first gear shaft 28, the second gear shaft 29 and the third gear shaft 20 are installed at the top of the frame 1. After removing the horizontal pull connection 3, when the ends of the first chain 21 and the second chain 22 reach the highest point, the tray on the roller conveying assembly 5 is not lower than the frame 1, that is, the tray can extend beyond the frame 1, facilitating top receiving and not wasting the top space. When the ends of the first chain 21 and the second chain 22 reach the lowest point, the bottom end of the roller conveying assembly 5 is flush with the bottom end of the frame 1 and can directly touch the ground. Compared with traditional elevators, in the same space, the stroke of this device is longer, it can directly sink to the ground, facilitating the entry and exit of the tray, and avoiding the risk of the roller conveying assembly 5 pressing on the feet of the staff. It can also rise to the top of the frame 1, facilitating transfer at the top, with a large lifting height and no wasted space. Compared with traditional elevators, it is more convenient to operate.

[0032] It should be noted that multiple groups of lifting chains 2 can be set according to the length of the roller conveying assembly 5 as required, and according to the lengths of the roller conveying assembly 5 and the frame 1, the lifting chains 2 on the frame 1 can be symmetrically or asymmetrically arranged. The length of the first chain 21 can be set as required as long as balance is maintained. This is to be compatible with goods of different sizes and has good compatibility.

[0033] In this embodiment, the minimum of two groups of lifting chains 2 are taken as an example and the two groups of lifting chains 2 are symmetrically arranged on two groups of frames 1, as shown in the figure. It also includes a lifting motor 26, and any one set of lifting shafts 24 of each group of lifting chains 2 is installed on the output shaft of the lifting motor 26.

[0034] The lifting motor 26 drives the lifting shaft 24 to rotate, thereby driving the sprocket 23 to rotate, and then driving the first chain 21 and the second chain 22 to lift and lower synchronously. The two groups of lifting chains 2 drive the roller conveying assembly 5 to lift and lower stably synchronously.

[0035] Preferably, there is one set of lifting motor 26, and a transmission roller 27 is installed between two sets of lifting shafts 24 at the same height of the two groups of lifting chains 2. The axis of the transmission roller 27 is perpendicular to the frame 1.

[0036] Preferably, the lifting motor 26 is installed at the bottom end of the frame 1, the transmission roller 27 is installed on the output shaft of the lifting motor 26, and the lifting shafts 24 at the bottom ends of the two groups of lifting chains 2 are all installed on the transmission roller 27. The lifting motor 26 drives the lifting shafts 24 at the bottom ends of the two groups of lifting chains 2 to rotate synchronously through the transmission roller 27, thereby driving the sprocket 23 to drive.

[0037] To ensure stability during lifting, the distance between the ends of the first chain 21 and the second chain 22 of each group of lifting chains 2 is greater than half of the length of the roller conveying assembly 5, that is, the distance between the first gear shaft 28 and the second gear shaft 29 is greater than half of the length of the roller conveying assembly 5, with the length direction of the roller conveying assembly 5 being the horizontal movement direction of the tray.

[0038] The roller conveyor assembly 5 includes a driving motor 51, a conveyor frame 52, and rollers 53. Multiple groups of rollers 53 are arranged in parallel within the conveyor frame 52, and the driving motor 51 drives the rollers 53 to rotate through a driving chain.

[0039] Preferably, the conveyor frame 52 is in an M shape. Two rows of horizontally arranged rollers 53 are installed on both sides of the conveyor frame 52, and two groups of driving chains are installed outside the rollers 53 on both sides. Each group of a row of shorter horizontally arranged rollers 53 is installed in the middle of the conveyor frame 52.

[0040] The first chain 21 and the second chain 22 of the two groups of lifting chains 2 are respectively installed on both sides of the conveyor frame 52.

[0041] To ensure the synchronous lifting and lowering of the two groups of lifting chains 2 and ensure that the ends of the chains are flush, a photoelectric detector 4 is installed on one of the first chain 21 or the second chain 22 or the sprocket 23. The detection end of the photoelectric detector 4 faces the other first chain 21 or the second chain 22 or the sprocket 23. If the photoelectric detector 4 detects that the other group of lifting chains 2 is offset, the lifting motor 26 immediately stops running.

[0042] A protective cover 6 is sleeved on the frame 1. Through holes are provided on the protective cover 6 on the inner side of the first chain 21 and the second chain 22 to avoid blocking the connection between the chains and the conveyor frame 52. The protective cover 6 protects the parts inside and has the functions of dust prevention, storage, and noise reduction.

[0043] Working principle: The tray is transferred to the driving roller 27, and the driving motor 51 drives the rollers 53 to rotate, thereby driving the tray to move horizontally; when the tray needs to be lifted or lowered, the lifting motor 26 drives the driving roller 27 to rotate, the driving roller 27 drives the two groups of lifting shafts 24 at the bottom to rotate, the lifting shafts 24 drive the sprockets 23 to rotate, and the sprockets 23 drive the first chain 21 and the second chain 22 to lift and lower synchronously through the connecting piece 25. The first chain 21 is installed at one end of the conveyor frame 52 away from the driving roller 27 after passing around the third gear shaft 20, the second gear shaft 29, and the first gear shaft 28, and the second chain 22 is installed at one end of the conveyor frame 52 close to the driving roller 27 after passing around the third gear shaft 20 and the second gear shaft 29. The bottoms of the two groups of first chains 21 and the two groups of second chains 22 are flush, driving the conveyor frame 52 to lift and lower stably.

[0044] The transmission mode of this device is built-in and is not easily affected by other structures, making the transmission more stable. The electrical control system has a protective cover 6 to protect and has little noise; the unique chain structure is compact and simple, and can drive the roller conveyor assembly 5 to sink to the ground, with high safety. It can also push the tray above the frame 1, facilitating receiving at the upper end, and has a large lifting height range and a long stroke; the unique winding design of the chain lifting can also integrate multiple groups of lifting chains 2 together to adapt to trays of different sizes, with good compatibility.

[0045] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0047] In the present invention, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0049] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A floor jack lift, comprising two sets of racks (1) and a roller conveyor assembly (5) arranged opposite to each other, and a lifting chain (2) is provided on each set of racks (1), characterized in that: The lifting chain (2) includes a first chain (21), a second chain (22) and a sprocket wheel (23). The first chain (21) is longer than the second chain (22). One end of the first chain (21) and the second chain (22) is flush and fixedly connected to the roller conveying assembly (5). The other end is installed on the sprocket wheel (23) through a connecting piece (25). The rotation of the sprocket wheel (23) drives the first chain (21) and the second chain (22) to lift synchronously.

2. The pallet jack lift according to claim 1, wherein: The ends of the first chain (21) and the second chain (22) of multiple groups of lifting chains (2) are flush and installed on the roller conveying assembly (5).

3. The pallet jack lift according to claim 1, characterized in that: When the ends of the first chain (21) and the second chain (22) reach the highest point, the tray on the roller conveying assembly (5) is not lower than the frame (1). When the ends of the first chain (21) and the second chain (22) reach the lowest point, the bottom end of the roller conveying assembly (5) is flush with the bottom end of the frame (1).

4. The floor jack lift according to claim 1, characterized in that: The sprocket wheel (23) is driven and connected by at least two groups of lifting shafts (24). The two opposite groups of lifting chains (2) are synchronously driven by a transmission roller (27). The transmission roller (27) is installed between two groups of lifting shafts (24) at the same height.

5. The pallet truck lift according to claim 1, wherein: An optoelectronic detection (4) is installed on the first chain (21) or the second chain (22) or the sprocket wheel (23) of one group of lifting chains (2), and the output direction of the optoelectronic detection (4) faces the other group of lifting chains (2).

6. The pallet jack lift according to claim 1, characterized in that: Multiple groups of horizontal pull connections (3) are detachably installed between the two groups of frames (1).

7. The pallet jack lift according to claim 1, characterized in that: A shield (6) is installed on the frame (1). The shield (6) surrounds the frame (1) and the lifting chain (2) thereon. Through holes are correspondingly formed in the shield (6) of the first chain (21) and the second chain (22) facing inward.

8. The pallet jack lift according to claim 1, characterized in that: The roller conveying assembly (5) includes a driving motor (51), a conveying frame (52) and rollers (53). Multiple groups of rollers (53) are arranged in parallel and installed in the conveying frame (52). The driving motor (51) drives the rollers (53) to rotate through a driving chain.

9. The pallet truck lift according to claim 8, wherein: The ends of the first chain (21) and the second chain (22) of the two groups of lifting chains (2) are respectively installed on the two side walls of the conveying frame (52).

10. The pallet jack lift according to claim 9, wherein: The distance between the first chain (21) and the second chain (22) of the same lifting chain (2) is greater than the length of the conveying frame (52). The length direction of the conveying frame (52) is the horizontal movement direction of the tray.

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