In-situ retracting and expanding type chassis of aerial work platform

Abstract

The utility model discloses an aerial work platform in-situ contraction and expansion type chassis which comprises a main body and two groups of expansion bridge assemblies which are arranged on the front side and the rear side of the main body and connected with the main body, each expansion bridge assembly comprises two symmetrically arranged expansion bridges, the expansion bridges can horizontally swing relative to the main body, the other ends of the expansion bridges are provided with advancing wheels, and the advancing wheels are connected with the main body. A first supporting rod and a second supporting rod which are arranged in a crossed mode are arranged between the two expansion bridges, the middle of the first supporting rod is rotationally connected with the middle of the second supporting rod, and the two ends of the first supporting rod are slidably connected with the inner side of one expansion bridge and the side wall of the main body correspondingly. The two ends of the second supporting rod are slidably connected with the inner side of the other expansion bridge and the side wall of the main body respectively, and the main body is provided with a driving air cylinder used for driving the connecting position of the first supporting rod and the second supporting rod to move front and back. The utility model has the characteristics that the synchronism and consistency of the contraction and expansion angles of the expansion bridge are maintained, the support strength and the structural stability of the expansion bridge are enhanced, and the cost of a driving part is saved.

Description

Technical Field

[0001] This utility model relates to an in-situ retractable chassis, specifically an in-situ retractable chassis for an aerial work platform. Background Technology

[0002] To ensure the stability of the entire vehicle during aerial work, the chassis of aerial work platforms is usually made very wide. However, an excessively wide chassis can cause inconvenience during transportation. Therefore, the chassis is designed as a telescopic structure, and the wheels can be extended or retracted to ensure stability and passability. In the existing technology, the wheels are extended or retracted by the outriggers rotating relative to the main body of the chassis.

[0003] Chinese patent application CN221214234U discloses a chassis mechanism for a traveling aerial work platform extension bridge, including a frame body and two sets of extension bridge assemblies connected to the frame body. Each set of extension bridge assemblies includes two left-right symmetrical extension bridge units. One end of each extension bridge unit is hinged to the frame body, allowing the extension bridge unit to swing horizontally relative to the frame body. An extension bridge cylinder is provided between the frame body and the extension bridge unit for pushing the extension bridge unit to extend outward or retract inward.

[0004] In the existing technology, each extension bridge unit is driven by a separate hydraulic cylinder. The cost of setting up the hydraulic cylinder is high, and the controllability requirements for the extension bridge during retraction and expansion are high. Independent hydraulic cylinder driving has the problem of inconsistent retraction and expansion angles and asynchronous retraction and expansion of each extension bridge, which will affect the support balance of the chassis, resulting in uneven stress on the chassis support and affecting the support stability. Utility Model Content

[0005] The purpose of this utility model is to provide an aerial work platform with a retractable chassis that solves the problem of inconsistent retraction angles of various extension bridges in the existing technology.

[0006] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: a retractable chassis for an aerial work platform, comprising a main body and two sets of extension bridge assemblies located on the front and rear sides of the main body and connected to the main body. Each extension bridge assembly includes two symmetrically arranged extension bridges. One end of each extension bridge is rotatably connected to the edge of the main body. Each extension bridge can swing horizontally relative to the main body. The other end of each extension bridge is provided with a travel wheel. A first support rod and a second support rod are arranged intersectingly between the two extension bridges. The first support rod and the second support rod are rotatably connected at the middle. The two ends of the first support rod are slidably connected to the inner side of one of the extension bridges and the side wall of the main body, respectively. The two ends of the second support rod are slidably connected to the inner side of the other extension bridge and the side wall of the main body, respectively. The main body is provided with a drive cylinder for driving the connection between the first support rod and the second support rod to move back and forth.

[0007] As a further preferred technical solution of this utility model; a rotating shaft is provided at the connection between the first support rod and the second support rod, the first support rod is provided with a mounting hole for the second support rod to pass through, and the second support rod is provided with a mounting part that mates with the mounting hole.

[0008] As a further preferred technical solution of this utility model; both ends of the rotating shaft are connected to the U-shaped connector, the U-shaped connector is located between the first support rod and the second support rod and is oriented towards the main body, and the output shaft end of the driving cylinder extends to the outside of the main body and is connected to the U-shaped connector.

[0009] As a further preferred technical solution of this utility model, both of the inner sides of the expansion bridges are provided with limiting grooves arranged along the length direction of the expansion bridges, and the connection ends of the first support rod and the second support rod with the expansion bridges are respectively provided with a first sliding shaft and a second sliding shaft that can move and rotate along the limiting grooves.

[0010] As a further preferred technical solution of this utility model, the side wall of the main body is provided with a guide groove that is slidably connected to the first support rod and the second support rod, and the connection end of the first support rod and the second support rod with the main body is provided with a third sliding shaft and a fourth sliding shaft that cooperate with the guide groove and are rotatable.

[0011] As a further preferred technical solution of this utility model, the output shaft of the driving cylinder is located in the middle of the guide slide groove, the third sliding shaft and the fourth sliding shaft are respectively located on both sides of the driving cylinder, and the two adjacent sides of the output shaft of the driving cylinder are provided with blocks corresponding to the guide slide groove.

[0012] As a further preferred technical solution of this utility model, both ends of the guide groove are provided with shrinkage grooves, and the shrinkage grooves are provided with telescopic springs connected to the third sliding shaft or the fourth sliding shaft.

[0013] Therefore, this utility model has the advantages of maintaining the synchronization and consistency of the expansion and contraction angles of the extension bridge, strengthening the support strength and structural stability of the extension bridge, and saving the cost of drive components. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the diagram;

[0016] Figure 3 yes Figure 1 Structural sectional view;

[0017] Figure 4 yes Figure 3 Enlarged view of the structure at point B in the diagram.

[0018] Explanation of reference numerals in the attached drawings: Main body 1; Extension bridge 2; Traveling wheel 21; First support rod 31; Second support rod 32; Drive cylinder 11; Rotating shaft 33; Mounting hole 310; Mounting part 320; U-shaped connector 34; Limiting groove 22; First sliding shaft 311; Second sliding shaft 321; Guide groove 12; Third sliding shaft 312; Fourth sliding shaft 322; Stop block 121; Contraction groove 122; Telescopic spring 13. Detailed Implementation

[0019] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0020] like Figure 1-3 As shown, an aerial work platform with a retractable chassis includes a main body 1 and two sets of extension bridge assemblies 2 located on the front and rear sides of the main body 1 and connected to the main body 1. Each extension bridge 2 assembly includes two symmetrically arranged extension bridges 2. One end of each extension bridge 2 is rotatably connected to the edge of the main body 1, allowing it to swing horizontally relative to the main body 1. The other end of each extension bridge 2 is equipped with a travel wheel 21. The extension bridge 2 assemblies are symmetrically arranged on both sides of the vehicle body, with the two extension bridges 2 symmetrically positioned on the same side. They can expand outwards for support or retract inwards for movement via the travel wheel 21. A first support rod 31 and a second support rod 32 are intersecting between the two extension bridges 2, rotatably connected at the middle. The first support rod 31 and the second support rod 32 intersect and rotatably connect to each other, forming an X-shaped structure. This structure supports and connects the two symmetrical extension bridges 2, allowing the two extension bridges 2 to be supported and connected by the first support rod 31 and the second support rod 32. The two support rods 32 restrict synchronous expansion or contraction, thereby ensuring the synchronicity and consistency of the contraction angle. The two ends of the first support rod 31 are slidably connected to the inner side of one of the expansion bridges 2 and the side wall of the main body 1, respectively. The two ends of the second support rod 32 are slidably connected to the inner side of the other expansion bridge 2 and the side wall of the main body 1, respectively. The main body 1 is provided with a drive cylinder 11 for driving the connection between the first support rod 31 and the second support rod 32 to move back and forth. When the drive cylinder 11 drives the rotation connection between the first support rod 31 and the second support rod 32 to move, the first support rod 31 and the second support rod 32 rotate synchronously. The two ends of the first support rod 31 and the second support rod 32 need to slide synchronously so as to control the expansion and contraction movement of the expansion bridge 2 through sliding, ensuring the stability of the structure. Moreover, only a single drive cylinder 11 is needed to drive and control the expansion and contraction of the two expansion bridges 2, effectively saving the cost of setting up the drive components. In this embodiment, the drive cylinder 11 can also be replaced with a drive hydraulic cylinder.

[0021] like Figure 1-2As shown, a rotating shaft 33 is provided at the connection between the first support rod 31 and the second support rod 32. The rotating shaft 33 passes through the connection between the first support rod 31 and the second support rod 32, allowing the first support rod 31 and the second support rod 32 to rotate around the rotating shaft 33 to drive the expansion and contraction of the extension bridge 2. The first support rod 31 has a mounting hole 310 for the second support rod 32 to pass through, and the second support rod 32 has a mounting part 320 that mates with the mounting hole 310. The rotating shaft 33 passes through the mounting hole 310 and the mounting part 320, allowing the mounting part 320 to connect with the mounting hole 310. This reduces the longitudinal width and volume of the first support rod 31 and the second support rod 32, and makes assembly simpler and the structure more stable. The rotating shaft 33 is connected to the U-shaped connector 34 at both ends. The U-shaped connector 34 is located between the first support rod 31 and the second support rod 32 and faces the main body 1. The output shaft of the drive cylinder 11 extends to the outside of the main body 1 and is connected to the U-shaped connector 34. The output shaft of the drive cylinder 11 is connected to the U-shaped connector 34, so that when the output shaft of the drive cylinder 11 extends or retracts, it can drive the rotating shaft 33 at the connection between the first support rod 31 and the second support rod 32 to move back and forth through the U-shaped connector 34. Thus, the two extension bridges 2 can be driven to retract and expand synchronously by a single drive cylinder 11, which effectively saves the cost of setting the drive component and makes the drive more stable and reliable, ensuring the synchronicity and consistency of the retraction and expansion of the two extension bridges 2.

[0022] like Figure 3-4As shown, both extension bridges 2 have limiting grooves 22 arranged along the length of the extension bridge 2 on their inner sides. The connection ends of the first support rod 31 and the second support rod 32 with the extension bridge 2 are respectively provided with a first sliding shaft 311 and a second sliding shaft 321 that can move and rotate along the limiting grooves 22. The first sliding shaft 311 and the second sliding shaft 321 are assembled in the limiting grooves 22 and are restricted by the limiting grooves 22 and cannot be removed. When the first support rod 31 and the second support rod 32 rotate, the first sliding shaft 311 and the second sliding shaft 321 slide smoothly in the limiting grooves 22 synchronously. During the sliding process, the first sliding shaft 311 and the second sliding shaft 321 push the extension bridge. 2. On the inner side, the two expansion bridges 2 expand and contract synchronously. The side wall of the main body 1 is provided with a guide groove 12 that is slidably connected to the first support rod 31 and the second support rod 32. The connection ends of the first support rod 31 and the second support rod 32 with the main body 1 are provided with a third sliding shaft 312 and a fourth sliding shaft 322 that cooperate with the guide groove 12 and are rotatable. The third sliding shaft 312 and the fourth sliding shaft 322 are assembled in the guide groove 12 and are restricted by the guide groove 12 and cannot be removed. When the first support rod 31 and the second support rod 32 rotate, the third sliding shaft 312 and the fourth sliding shaft 322 adapt to the rotation of the first support rod 31 and the second support rod 32 and the expansion bridge 2. The expansion and contraction actions are synchronized, with the two expansion bridges 2 sliding in opposite directions within the guide groove 12, allowing them to complete synchronized expansion and contraction. The output shaft of the drive cylinder 11 is located in the middle of the guide groove 12. The third sliding shaft 312 and the fourth sliding shaft 322 are located on both sides of the drive cylinder 11. Stops 121 are provided on both adjacent sides of the output shaft of the drive cylinder 11 within the guide groove 12. The stops 121 limit the sliding of the third sliding shaft 312 and the fourth sliding shaft 322, preventing them from sliding excessively and colliding with the output shaft of the drive cylinder 11, and also preventing the third sliding shaft 312 and the fourth sliding shaft 322 from collide. Excessive sliding causes the third sliding shaft 312 and the fourth sliding shaft 322 to jam and become unable to move to both sides. Both ends of the guide slide groove 12 are provided with shrinkage grooves 122. The shrinkage grooves 122 are provided with telescopic springs 13 connected to the third sliding shaft 312 or the fourth sliding shaft 322. The telescopic springs 13 provide auxiliary force when the third sliding shaft 312 and the fourth sliding shaft 322 slide to both sides, helping the third sliding shaft 312 and the fourth sliding shaft 322 to start sliding quickly, and reducing the driving load of the drive cylinder 11. The shrinkage grooves 122 are used to house the shrinking telescopic springs 13, reducing the occupancy of the telescopic springs 13 on the guide slide groove 12.

[0023] When the extension bridge 2 expands or retracts, the output shaft inside the drive cylinder 11 moves. As the output shaft of the drive cylinder 11 moves, the U-shaped connector 34 is also driven to move. Thus, the U-shaped connector 34 drives one end of the first support rod 31 and the second support rod 32 to move along the guide slide groove 12, and the other end of the first support rod 31 and the second support rod 32 slides synchronously along the limiting slide groove 22. The movement of the two ends of the first support rod 31 and the second support rod 32 causes the extension bridge 2 to swing outward or retract inward, thereby realizing the expansion and retraction control of the extension bridge 2.

[0024] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A retractable chassis for an aerial work platform, comprising a main body (1) and two sets of extension bridge assemblies located on the front and rear sides of the main body (1) and connected to the main body (1), wherein the extension bridge assembly comprises two symmetrically arranged extension bridges (2), characterized in that: One end of the extension bridge (2) is rotatably connected to the edge of the main body (1). The extension bridge (2) can swing horizontally relative to the main body (1). The other end of the extension bridge (2) is provided with a travel wheel (21). A first support rod (31) and a second support rod (32) are provided between the two extension bridges (2) and are arranged in a cross manner. The first support rod (31) and the second support rod (32) are rotatably connected in the middle. The two ends of the first support rod (31) are slidably connected to the inner side of one of the extension bridges (2) and the side wall of the main body (1), respectively. The two ends of the second support rod (32) are slidably connected to the inner side of the other extension bridge (2) and the side wall of the main body (1), respectively. The main body (1) is provided with a drive cylinder (11) for driving the connection between the first support rod (31) and the second support rod (32) to move back and forth.

2. The aerial work platform retractable chassis according to claim 1, characterized in that: A rotating shaft (33) is provided at the connection between the first support rod (31) and the second support rod (32). The first support rod (31) is provided with a mounting hole (310) for the second support rod (32) to pass through. The second support rod (32) is provided with a mounting part (320) that cooperates with the mounting hole (310).

3. The aerial work platform with a retractable chassis according to claim 2, characterized in that: The two ends of the rotating shaft (33) are connected to the U-shaped connector (34). The U-shaped connector (34) is located between the first support rod (31) and the second support rod (32) and is oriented towards the main body (1). The output shaft end of the driving cylinder (11) extends to the outside of the main body (1) and is connected to the U-shaped connector (34).

4. The aerial work platform retractable chassis according to claim 1, characterized in that: Both of the extension bridges (2) are provided with limiting grooves (22) along the length of the extension bridge (2) on their inner sides. The first support rod (31) and the second support rod (32) are respectively provided with a first sliding shaft (311) and a second sliding shaft (321) that can move and rotate along the limiting grooves (22).

5. The aerial work platform retractable chassis according to claim 1, characterized in that: The main body (1) has a guide groove (12) on its side wall that is slidably connected to the first support rod (31) and the second support rod (32). The connection ends of the first support rod (31) and the second support rod (32) with the main body (1) are provided with a third sliding shaft (312) and a fourth sliding shaft (322) that cooperate with the guide groove (12) and are rotatable.

6. The aerial work platform retractable chassis according to claim 5, characterized in that: The output shaft of the drive cylinder (11) is located in the middle of the guide slide groove (12). The third sliding shaft (312) and the fourth sliding shaft (322) are located on both sides of the drive cylinder (11). The two adjacent sides of the output shaft of the drive cylinder (11) are provided with a stop block (121) in the guide slide groove (12).

7. A retractable chassis for an aerial work platform according to claim 5 or 6, characterized in that: Both ends of the guide groove (12) are provided with contraction grooves (122), and the contraction grooves (122) are provided with telescopic springs (13) connected to the third sliding shaft (312) or the fourth sliding shaft (322).

Images