Scissor fork type lifting aerial work platform

Abstract

The invention relates to the technical field of scissor lift trucks, and discloses a scissor type lifting aerial work platform which comprises a movable base and a working platform, a unit diagonal bridging is arranged between the movable base and the working platform, and the unit diagonal bridging comprises a first telescopic arm, a second telescopic arm and a driving assembly. The first telescopic arm and the second telescopic arm are rotationally connected with each other, and the driving assembly drives the telescopic movable ends of the first telescopic arm and the second telescopic arm to synchronously stretch out and draw back. According to the scissor-type lifting aerial work platform, the unit cross bridging lifting working platform formed by arranging the first telescopic arm and the second telescopic arm in a scissor-type mode is adopted, the two ends of the first telescopic arm and the two ends of the second telescopic arm are the telescopic movable ends, the telescopic movable ends synchronously stretch out and draw back, the lifting distance of the unit cross bridging is increased, and the working efficiency is improved. And it can be guaranteed that the occupied area of the upper side and the lower side of the unit diagonal bridging is not changed, and the stability of the unit diagonal bridging is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of scissors lift trucks, and particularly to a scissor lift type aerial work platform. Background Art

[0002] A scissors lift truck is an important lifting device for aerial work, and is widely used in industries, logistics, warehousing and other fields, mainly for aerial installation, loading, unloading and handling of goods. For example, in the prior art, a patent document with the publication number CN102838052B discloses an upper-pressure type scissor frame mechanism, which includes an upper platform, two left support arms, two right support arms, two hydraulic cylinders and a lower platform; the upper platform is arranged above the lower platform; the lower ends of the two right support arms are respectively hinged to both sides of the left end surface of the lower platform, and a roller is respectively installed on the front and rear sides of the upper end of each right support arm; the upper ends of the two left support arms are respectively hinged to both sides of the bottom surface of the left end of the upper platform, and a roller is respectively installed on both sides of the lower end of each left support arm, and the middle parts of one left support arm and one right support arm are hinged together; the bottom surfaces of the two hydraulic cylinder bodies are respectively hinged to the upper parts of the two right support arms, and the outer ends of the piston rods are respectively hinged to both sides of the middle part of the bottom surface of the upper platform. In the upper-pressure type scissor frame mechanism of the invention, the hydraulic cylinders are arranged on the upper parts of the right support arms, so the stroke of the hydraulic cylinders is short. In addition, during the lifting process, the stroke of the hydraulic cylinders first increases with the increase of the lifting height of the upper platform, and then after reaching a certain height, the hydraulic cylinders move in the reverse direction with the increase of the height of the upper platform. Therefore, the utilization rate of the hydraulic cylinders is high.

[0003] Most of the current scissors lift trucks adopt the above-mentioned scissor frame structure, as Figure 8 shown, the roller 6 is in rolling contact (or relative movement) with the upper platform 1, and the roller 7 is in rolling contact (or relative movement) with the lower platform 5. When the upper platform is lifted, the area occupied by the upper and lower sides of the scissor frame decreases, and the stability decreases. In particular, when it is required to lift the upper platform to a relatively high height, usually multiple unit scissor frames are assembled vertically for use. The lifting height of each unit scissor frame is limited. If the number of unit scissor frames is large, when the upper platform descends to the lowest point, the height difference between the upper platform and the ground is very large, that is, the lowest working height of the scissors lift truck is relatively high, resulting in a relatively large overall volume and inconvenient use.

[0004] For the above reasons, the existing scissors lift trucks have problems that the lifting height is greatly limited by the number of unit scissor frames, resulting in an increase in the lifting height, a significant increase in the lowest working height, a relatively large overall volume and poor stability. Summary of the Invention

[0005] The object of the present invention is to solve the problems in the prior art that the lifting height of the existing scissors lift truck is greatly limited by the number of unit scissors frames, resulting in an increase in the lifting height, a significant increase in the minimum working height, a relatively large overall volume, and poor stability. A scissor-type elevated aerial work platform is proposed.

[0006] To achieve the above object, the present invention adopts the following technical solution: A scissor-type elevated aerial work platform includes a mobile base and a working platform. There is a unit scissor brace arranged between the mobile base and the working platform. Rollers are arranged on both sides of the mobile base. The unit scissor brace includes a first telescopic arm, a second telescopic arm, and a driving component. The first telescopic arm and the second telescopic arm are rotatably connected to each other. The internal structures of the first telescopic arm and the second telescopic arm are the same, and telescopic movable ends are arranged at both ends of the first telescopic arm and the second telescopic arm. The upper telescopic movable ends of the first telescopic arm and the second telescopic arm are rotatably connected to the lower surface of the working platform, and the lower telescopic movable ends of the first telescopic arm and the second telescopic arm are rotatably connected to the upper surface of the mobile base. The driving component drives the telescopic movable ends of the first telescopic arm and the second telescopic arm to perform synchronous telescopic actions, which not only increases the lifting distance of the unit scissor brace and realizes the vertical lifting of the working platform, but also ensures that the occupied areas on the upper and lower sides of the unit scissor brace remain unchanged, improving its stability.

[0007] Preferably, the first telescopic arm includes a first sleeve. A first support plate and a second support plate are respectively slidably installed in the first sleeve. Tooth grooves are formed on the opposite surfaces of the first support plate and the second support plate. A plurality of first gears are rotatably installed in the first sleeve. The first support plate and the second support plate are both in meshing transmission with the first gears, realizing the function of synchronous telescopic movement of the telescopic movable ends at both ends of the first telescopic arm.

[0008] The second telescopic arm includes a second sleeve. A third support plate and a fourth support plate are respectively slidably installed in the second sleeve. Tooth grooves are formed on the opposite surfaces of the third support plate and the fourth support plate. A plurality of second gears are rotatably installed in the second sleeve. The third support plate and the fourth support plate are both in meshing transmission with the second gears, realizing the function of synchronous telescopic movement of the telescopic movable ends at both ends of the second telescopic arm.

[0009] Preferably, both the first sleeve and the second sleeve are rotatably connected to a connecting shaft. The upper ends of the first support plate and the third support plate are rotatably connected to the lower surface of the working platform, and the lower ends of the second support plate and the fourth support plate are rotatably connected to the upper surface of the mobile base.

[0010] One end of the connecting shaft is coaxially fixed to one of the first gears, and the other end of the connecting shaft is coaxially fixed to one of the second gears, realizing the function of synchronous telescopic movement of the telescopic movable ends of the first telescopic arm and the second telescopic arm.

[0011] Preferably, the first support plate is arranged on the upper side of the second support plate, and the fourth support plate is arranged on the upper side of the third support plate. When the connecting shaft, the first gear, and the second gear rotate forward and backward, the synchronous telescopic movement of the first telescopic arm and the second telescopic arm is realized.

[0012] Preferably, the driving assembly is a hydraulic cylinder. One end of the hydraulic cylinder is rotatably connected to the side surface of the second support plate, and the other end of the hydraulic cylinder is rotatably connected to the side surface of the first support plate. Power is provided by one hydraulic cylinder to drive the length telescopic change and the angle change of the first telescopic arm and the second telescopic arm.

[0013] Preferably, there are multiple unit cross braces. A partition is arranged between the upper and lower adjacent unit cross braces. The bottom ends of the upper unit cross braces are all rotatably connected to the upper surface of the partition, and the top ends of the lower unit cross braces are all rotatably connected to the lower surface of the partition, which meets the requirement of assembling multiple unit cross braces in the vertical direction for use and improves the use requirement of the lifting height.

[0014] The present invention has the following beneficial effects: 1. The scissor lift aerial work platform proposed by the present invention uses unit cross braces with a scissor-like arrangement of the first telescopic arm and the second telescopic arm to lift the work platform. Both ends of the first telescopic arm and the second telescopic arm are telescopic movable ends, and the telescopic movable ends perform synchronous telescopic movements. This not only increases the lifting distance of the unit cross braces and realizes the vertical lifting of the work platform, but also ensures the unchanged occupied area on the upper and lower sides of the unit cross braces, improving its stability.

[0015] 2. The unit cross braces proposed by the present invention achieve the lifting function through two means: The first is to realize the vertical lifting function through the change of the angle (∠a) between the first telescopic arm and the second telescopic arm. When ∠a decreases, the lifting height of the unit cross braces increases, which is also the lifting principle of existing scissor lift trucks. The second is to further increase the lifting height of the unit cross braces through the length change of the first telescopic arm and the second telescopic arm. This design enables the unit cross braces to have a higher lifting distance. Compared with existing scissor lift trucks, for the same total lifting height, the present invention only needs a smaller number of unit cross braces to be assembled in the vertical direction for use, and can achieve a lower minimum working height, and also reduces the overall volume of the device, facilitating movement.

[0016] 3. For the unit cross bracing proposed by the present invention, as the included angle (∠a) between the first telescopic arm and the second telescopic arm changes, the first telescopic arm and the second telescopic arm rotate around the connecting shaft. Both ends of the connecting shaft are fixedly connected to the first gear and the second gear respectively. When the hydraulic cylinder drives the first support plate and the second support plate to separate from each other, through the transmission of the connecting shaft, the first gear and the second gear, the third support plate and the fourth support plate are driven to separate from each other synchronously. That is, the length telescopic change and the angle change of the first telescopic arm and the second telescopic arm are realized simultaneously, which can be achieved by providing power with one hydraulic cylinder, achieving the effect of convenient control and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall three-dimensional structure schematic diagram of the present invention (assembly of two unit cross bracings); Figure 2 is the three-dimensional structure schematic diagram of the moving base and one unit cross bracing of the present invention; Figure 3 is the side sectional structure schematic diagram of the first telescopic arm and the second telescopic arm proposed by the present invention; Figure 4 is the internal structure schematic diagram of the first telescopic arm and the second telescopic arm proposed by the present invention; Figure 5 is Figure 4 the enlarged schematic diagram of the structure at A in Figure 6 is the internal structure schematic diagram of the second telescopic arm proposed by the present invention; Figure 7 is the overall front view structure schematic diagram of the present invention; Figure 8 is the structure schematic diagram of an upper pressing type scissors frame mechanism proposed in the background art.

[0018] In the figures: 1 moving base, 2 working platform, 3 first telescopic arm, 4 second telescopic arm, 5 first pipe sleeve, 6 first support plate, 7 second support plate, 8 first gear, 9 second pipe sleeve, 10 third support plate, 11 fourth support plate, 12 second gear, 13 connecting shaft, 14 hydraulic cylinder, 15 partition plate, 16 roller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It 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 on the present invention.

[0021] Referring to Figures 1-7 , a scissor lift aerial work platform includes a mobile base 1 and a work platform 2. A unit scissor brace is provided between the mobile base 1 and the work platform 2.

[0022] The unit scissor brace includes a first telescopic arm 3, a second telescopic arm 4 and a drive assembly. The first telescopic arm 3 and the second telescopic arm 4 are rotatably connected to each other. The internal structures of the first telescopic arm 3 and the second telescopic arm 4 are the same, and telescopic movable ends are provided at both ends of the first telescopic arm 3 and the second telescopic arm 4. The upper telescopic movable ends of the first telescopic arm 3 and the second telescopic arm 4 are rotatably connected to the lower surface of the work platform 2, and the lower telescopic movable ends of the first telescopic arm 3 and the second telescopic arm 4 are rotatably connected to the upper surface of the mobile base 1.

[0023] The drive assembly drives the telescopic movable ends of the first telescopic arm 3 and the second telescopic arm 4 to perform synchronous telescopic actions.

[0024] Specifically, referring to Figure 3 、 Figure 4 , the first telescopic arm 3 includes a first pipe sleeve 5. A first support plate 6 and a second support plate 7 are respectively slidably installed in the first pipe sleeve 5. Tooth grooves are provided on the opposite surfaces of the first support plate 6 and the second support plate 7. A plurality of first gears 8 are rotatably installed in the first pipe sleeve 5. Both the first support plate 6 and the second support plate 7 are in meshing transmission with the first gears 8, realizing the function of synchronous telescoping of the telescopic movable ends at both ends of the first telescopic arm 3.

[0025] The second telescopic arm 4 includes a second pipe sleeve 9. A third support plate 10 and a fourth support plate 11 are respectively slidably installed in the second pipe sleeve 9. Tooth grooves are provided on the opposite sides of the third support plate 10 and the fourth support plate 11. A plurality of second gears 12 are rotatably installed in the second pipe sleeve 9. Both the third support plate 10 and the fourth support plate 11 are in meshing transmission with the second gears 12, realizing the function of synchronous telescoping of the telescopic movable ends at both ends of the second telescopic arm 4.

[0026] In this embodiment, referring to Figure 5 、 Figure 6, both the first pipe sleeve 5 and the second pipe sleeve 9 are rotatably connected to the connecting shaft 13. The upper ends of the first support plate 6 and the third support plate 10 are rotatably connected to the lower surface of the working platform 2, and the lower ends of the second support plate 7 and the fourth support plate 11 are rotatably connected to the upper surface of the moving base 1.

[0027] One end of the connecting shaft 13 is coaxially and fixedly connected to one of the first gears 8, and the other end of the connecting shaft 13 is coaxially and fixedly connected to one of the second gears 12. Among them, the first support plate 6 is arranged above the second support plate 7, and the fourth support plate 11 is arranged above the third support plate 10. Refer to Figure 4 , Figure 5 , when the first support plate 6 and the second support plate 7 move away from each other, at this time, the connecting shaft 13, the first gear 8, and the second gear 12 rotate counterclockwise, thereby driving the third support plate 10 and the fourth support plate 11 to move away from each other.

[0028] In this embodiment, the driving component is a hydraulic cylinder 14. One end of the hydraulic cylinder 14 is rotatably connected to the side surface of the second support plate 7, and the other end of the hydraulic cylinder 14 is rotatably connected to the side surface of the first support plate 6. Rollers 16 are arranged on both sides of the moving base 1.

[0029] A motor for driving the rollers 16 to rotate and a hydraulic pump for driving the hydraulic cylinder 14 to work are arranged in the moving base 1. This is a conventional setting of the prior art and is not within the scope of protection required by the present invention, so it will not be elaborated here.

[0030] When the hydraulic cylinder 14 extends, the lengths of the first telescopic arm 3 and the second telescopic arm 4 increase simultaneously, as Figure 7 shown, and the lengths of the first telescopic arm 3 and the second telescopic arm 4 are equal (L1 = L2).

[0031] There are multiple unit diagonal braces. Partition plates 15 are arranged between the upper and lower adjacent unit diagonal braces. The bottom ends of the upper unit diagonal braces are rotatably connected to the upper surface of the partition plate 15, and the top ends of the lower unit diagonal braces are rotatably connected to the lower surface of the partition plate 15, as Figure 1 shown.

[0032] Working principle: The unit diagonal brace proposed by the present invention realizes the common lifting function through two means: The first is to realize the lifting function in the vertical direction through the change of the included angle (∠a) between the first telescopic arm 3 and the second telescopic arm 4. Refer to Figure 7 , when ∠a decreases, the lifting height of the unit diagonal brace increases. This is also the lifting principle of the existing scissor lift truck. The second type is to further increase the lifting height of the unit cross bracing by changing the lengths of the first telescopic arm 3 and the second telescopic arm 4. In this design, when the lengths of the first telescopic arm 3 and the second telescopic arm 4 increase, the unit cross bracing has a higher lifting distance. When the lengths of the first telescopic arm 3 and the second telescopic arm 4 decrease, the folding volume of the unit cross bracing is reduced.

[0033] It should be further noted that if the structure of the existing scissor lift truck is adopted, that is, the length of the cross bracing structure remains unchanged. During the lifting process, the lifting height is determined by ∠a. In the state of ∠a, if the lifting height is h; For the unit cross bracing proposed by the present invention, during the lifting process, when the lengths of the first telescopic arm 3 and the second telescopic arm 4 increase (and L1 = L2), when the included angle between the first telescopic arm 3 and the second telescopic arm 4 is in the state of ∠a, at this time, the bottom ends of the first telescopic arm 3 and the second telescopic arm 4 extend, and the top ends of the first telescopic arm 3 and the second telescopic arm 4 extend, that is, there is an increase in the vertical direction. In the state of ∠a, the total lifting height of the unit cross bracing is H = h + the said increase, and H is greater than h, that is, the lifting height of the unit cross bracing is further increased.

[0034] The lifting height of a single unit cross bracing is limited. During actual use, multiple unit cross bracings need to be assembled vertically. Compared with the existing scissor lift truck, for the same total lifting height, the present invention only needs a smaller number of unit cross bracings to be assembled vertically, and can achieve a lower minimum working height, and also reduces the overall volume of the device, making it convenient to move. Because each unit cross bracing has a certain height in the folded state, if there are many unit cross bracings, the height difference between the working platform 2 and the ground is very large, that is, the minimum working height is relatively high.

[0035] When the included angle (∠a) between the first telescopic arm 3 and the second telescopic arm 4 changes, the first telescopic arm 3 and the second telescopic arm 4 rotate around the connecting shaft 13 as the axis. Both ends of the connecting shaft 13 are fixedly connected to the first gear 8 and the second gear 12 respectively. When the hydraulic cylinder 14 drives the first support plate 6 and the second support plate 7 to separate from each other, through the transmission of the connecting shaft 13, the first gear 8, and the second gear 12, the third support plate 10 and the fourth support plate 11 are driven to separate from each other synchronously. That is, the length telescopic change and the included angle change of the first telescopic arm 3 and the second telescopic arm 4 are simultaneously realized, and it can be achieved by providing power with a single hydraulic cylinder 14, achieving the effect of convenient control and operation.

[0036] The scissor-lift type aerial work platform proposed by the present invention uses a unit scissor brace composed of a first telescopic arm 3 and a second telescopic arm 4 arranged in a scissor pattern to lift the work platform 2. Both ends of the first telescopic arm 3 and the second telescopic arm 4 are telescopic movable ends, and each telescopic movable end performs synchronous telescopic actions, which not only increases the lifting distance of the unit scissor brace and realizes the vertical lifting of the work platform 2, but also ensures that the occupied areas on the upper and lower sides of the unit scissor brace (such as Figure 7 shown by S1 and S2 in

[0037] remain unchanged, thereby improving its stability. As described above, 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, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A scissor lift aerial work platform, comprising a mobile base (1) and a working platform (2), and a unit scissor brace is arranged between the mobile base (1) and the working platform (2), characterized in that: The unit diagonal bracing includes a first telescopic arm (3), a second telescopic arm (4) and a driving assembly. The first telescopic arm (3) and the second telescopic arm (4) are rotatably connected to each other. The internal structures of the first telescopic arm (3) and the second telescopic arm (4) are the same, and telescopic movable ends are provided at both ends of the first telescopic arm (3) and the second telescopic arm (4). The upper telescopic movable ends of the first telescopic arm (3) and the second telescopic arm (4) are rotatably connected to the lower surface of the working platform (2), and the lower telescopic movable ends of the first telescopic arm (3) and the second telescopic arm (4) are rotatably connected to the upper surface of the moving base (1). The driving assembly drives the telescopic movable ends of the first telescopic arm (3) and the second telescopic arm (4) to perform synchronous telescopic actions.

2. The scissor lift aerial work platform according to claim 1, wherein: The first telescopic arm (3) includes a first pipe sleeve (5). A first support plate (6) and a second support plate (7) are respectively slidably installed in the first pipe sleeve (5). Tooth grooves are formed on the opposite surfaces of the first support plate (6) and the second support plate (7). A plurality of first gears (8) are rotatably installed in the first pipe sleeve (5). The first support plate (6) and the second support plate (7) are both in meshing transmission with the first gears (8).

3. The scissor lift aerial work platform according to claim 2, characterized in that: The second telescopic arm (4) includes a second pipe sleeve (9). A third support plate (10) and a fourth support plate (11) are respectively slidably installed in the second pipe sleeve (9). Tooth grooves are formed on the opposite surfaces of the third support plate (10) and the fourth support plate (11). A plurality of second gears (12) are rotatably installed in the second pipe sleeve (9). The third support plate (10) and the fourth support plate (11) are both in meshing transmission with the second gears (12).

4. A scissor lift aerial work platform according to claim 3, characterized in that: Both the first pipe sleeve (5) and the second pipe sleeve (9) are rotatably connected to a connecting shaft (13). The upper ends of the first support plate (6) and the third support plate (10) are rotatably connected to the lower surface of the working platform (2), and the lower ends of the second support plate (7) and the fourth support plate (11) are rotatably connected to the upper surface of the moving base (1).

5. A scissor lift aerial work platform according to claim 4, characterized in that: One end of the connecting shaft (13) is coaxially and fixedly connected to one of the first gears (8), and the other end of the connecting shaft (13) is coaxially and fixedly connected to one of the second gears (12).

6. The scissor lift aerial work platform according to claim 5, wherein: The first support plate (6) is arranged above the second support plate (7), and the fourth support plate (11) is arranged above the third support plate (10).

7. A scissor lift aerial work platform according to claim 6, characterized in that: The driving assembly is a hydraulic cylinder (14). One end of the hydraulic cylinder (14) is rotatably connected to the side surface of the second support plate (7), and the other end of the hydraulic cylinder (14) is rotatably connected to the side surface of the first support plate (6).

8. A scissor lift aerial work platform according to any one of claims 1-7, characterized in that: There are multiple unit diagonal bracings. A partition plate (15) is arranged between the upper and lower adjacent unit diagonal bracings. The bottom ends of the upper unit diagonal bracings are rotatably connected to the upper surface of the partition plate (15), and the top ends of the lower unit diagonal bracings are rotatably connected to the lower surface of the partition plate (15).

9. The scissor lift aerial work platform according to claim 8, characterized in that: Rollers (16) are arranged on both sides of the moving base (1).

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