Telescopic chassis structure applied to excavator

Abstract

The utility model discloses a telescopic chassis structure applied to an excavator, belongs to the technical field of excavators, and solves the problems that a hydraulic pipeline is easy to collide and bend and short in service life in the prior art, and solves the problems that an H frame is unstable in structure and a telescopic chassis lacks a reliable telescopic positioning and locking structure. The hydraulic track mainly comprises a left track beam and a right track beam, an H frame is arranged between the left track beam and the right track beam, a positioning hole is formed in the H frame, the limiting hole and the positioning hole are matched through a positioning pin shaft, a pipeline bracket is arranged on the H frame and comprises an upper cross rod and a lower cross rod, and a hydraulic pipeline I is erected on the upper cross rod; the hydraulic pipeline II is erected between the upper cross rod and the lower cross rod; a protection plate structure is arranged in the middle of the H-shaped frame and comprises a fixing plate, and the fixing plate is connected to the H-shaped frame in an inserted mode.

Description

Technical Field

[0001] The utility model relates to the technical field of excavators, and in particular to a telescopic chassis structure applied to excavators. Background Art

[0002] The excavator equipped with a telescopic chassis can effectively improve the stability of the whole machine. When working, the chassis can be extended to expand the chassis width, which can effectively avoid the risk of the whole machine tipping over and improve the safety of operation. At the same time, when the whole machine is transported, the chassis width can be reduced by retracting the chassis, and a smaller width trailer can be used for transportation, which reduces transportation costs and improves transportation convenience. Therefore, excavators equipped with telescopic chassis have better stability and maneuverability, and are indispensable and important equipment for modern construction.

[0003] In the prior art, the application with publication number CN211472677U discloses a telescopic chassis and excavator, which includes a chassis, a left beam and a right beam arranged on both sides of the chassis, and a hydraulic control system, wherein a telescopic arm is connected between the left beam and the right beam, and the chassis is provided with a guide hole, and the telescopic arm is inserted into the guide hole; however, the telescopic chassis will cause the chassis hydraulic pipeline to move with the frame during extension and retraction, and the left and right hydraulic pipelines often collide and bend, resulting in a reduction in the life of the hydraulic pipeline, and the middle chassis of the H frame is bolted to a fixed wire seat, which will cause the middle guard plate of the chassis to collide and deform, and the bolts are prone to breakage or tearing of the fixed wire seat, and it is difficult to repair after a failure. At present, there is a lack of a telescopic chassis structure that can avoid collision and bending of hydraulic pipelines and has stable operation. Summary of the invention

[0004] The purpose of the utility model is to provide a telescopic chassis structure applied to an excavator, so as to solve the problems in the prior art that hydraulic pipelines are easily collided and bent, and the hydraulic pipelines have a short service life, and solve the problems of the H-frame structure being unstable and the telescopic chassis lacking a reliable telescopic positioning and locking structure.

[0005] The utility model is realized by the following technical solutions:

[0006] A telescopic chassis structure used for an excavator comprises a left crawler beam and a right crawler beam, an H frame is arranged between the left crawler beam and the right crawler beam, a telescopic oil cylinder I and a telescopic oil cylinder II are fixed on the H frame, a piston rod of the telescopic oil cylinder I is connected to the left crawler beam, a piston rod of the telescopic oil cylinder II is connected to the right crawler beam, the telescopic oil cylinder I is connected to a hydraulic pipeline I, and the telescopic oil cylinder II is connected to a hydraulic pipeline II; the left crawler beam and the right crawler beam are respectively provided with limiting holes, a positioning hole is arranged on the H frame, the limiting hole and the positioning hole are matched by a positioning pin shaft, a pipeline bracket is arranged on the H frame, the pipeline bracket comprises an upper cross bar and a lower cross bar, the hydraulic pipeline I is laid on the upper cross bar, and the hydraulic pipeline II is laid between the upper cross bar and the lower cross bar; a guard plate structure is arranged in the middle of the H frame, the guard plate structure comprises a fixing plate, and the fixing plate is plugged into the H frame.

[0007] Furthermore, the guard plate structure includes two fixed plates and a connecting plate. The fixed plates are provided with card slots. The fixed plates are fixedly plugged with the H frame through the card slots. The two fixed plates are connected by a connecting plate.

[0008] Furthermore, the left crawler beam and the right crawler beam are both provided with telescopic channels, and the H frame is provided with a telescopic guide tube corresponding to the telescopic channel, and the telescopic guide tube is slidably connected to the telescopic channel; the telescopic cylinder I and the telescopic cylinder II are both fixed in the telescopic guide tube, and the piston rods of the telescopic cylinder I and the telescopic cylinder II are fixedly connected to the telescopic guide tube.

[0009] Furthermore, a limit hole is provided on the telescopic channel, a positioning hole is provided on the telescopic guide tube, and the positioning hole I and positioning hole II are horizontally spaced apart, and the spacing distance is equal to the stroke of the telescopic cylinder I or the telescopic cylinder II.

[0010] Furthermore, a locking bolt and a locking nut are provided on the positioning pin shaft, and the locking bolt and the locking nut cooperate with each other.

[0011] Furthermore, the lower cross bar is C-shaped, with an opening facing upward, the upper cross bar is welded to the lower cross bar, the welding point is fixed by a rib plate, and the lower cross bar is fixedly connected to the H frame.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model adopts the mode of cooperation between the upper cross bar and the lower cross bar to avoid collision and bending of the hydraulic pipeline and improve the service life of the hydraulic pipeline.

[0014] 2. The middle guard plate of the utility model is plugged into the bottom plate of the H frame through a slot, and the bottom plate of the H frame does not need to be welded with a fixing wire seat, thereby increasing the service life of the H frame.

[0015] 3. The utility model adopts the mode of cooperating the limit hole and the positioning hole, which can improve the efficiency of telescopic movement and the safety of work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the chassis structure of the utility model;

[0017] Figure 2 Schematic diagram of the layout of the hydraulic cylinder of the utility model;

[0018] Figure 3 Schematic diagram of the H frame structure of the utility model;

[0019] Figure 4 A schematic diagram of the structure of the left crawler beam of the utility model;

[0020] Figure 5 A schematic diagram of the structure of the pipeline bracket of the utility model;

[0021] Figure 6 Schematic diagram of the existing structure where the middle guard plate of the chassis is not connected;

[0022] Figure 7 Schematic diagram of the connection structure of the middle guard plate of the existing structural chassis;

[0023] Figure 8 A schematic diagram of the structure in which the middle guard plate of the chassis of the utility model is not connected;

[0024] Fig. 9 A schematic diagram of the connection structure of the middle guard plate of the chassis of the utility model;

[0025] Fig.10 A schematic diagram of the structure of the intermediate guard plate of the utility model;

[0026] Fig.11 A schematic diagram of the positioning pin structure of the utility model;

[0027] Fig.12 yes Fig.11 Schematic diagram of the structure of part II.

[0028] In the figure: 1. left crawler beam; 2. H frame; 3. right crawler beam; 4. guide wheel; 5. hydraulic pipeline II; 6. pipeline bracket; 7. hydraulic pipeline I; 8. positioning pin; 9. travel motor; 10. driving wheel; 11. support chain wheel; 12. telescopic cylinder; 13. positioning hole I; 14. positioning hole II; 15. limiting hole; 16. upper cross bar; 17. lower cross bar; 18. fixing wire seat; 19. fixing bolt; 21. telescopic guide tube; 22. fixing plate; 23. slot; 24. connecting plate; 25. locking bolt; 26. locking nut; 27. telescopic channel. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the creation of the present invention.

[0030] The utility model is further described below in conjunction with the accompanying drawings.

[0031] Embodiment 1: A telescopic chassis structure applied to an excavator, such as Figure 1-Figure 4 As shown, it includes a left crawler beam 1, an H frame 2, a right crawler beam 3, a guide wheel 4, a right hydraulic pipeline, a pipeline bracket 6, a left hydraulic pipeline, a positioning pin shaft 8, a travel motor 9, a driving wheel 10, a support chain wheel 11 and a telescopic cylinder 12. An H frame 2 is provided between the left crawler beam 1 and the right crawler beam 3. Four telescopic cylinders 12 are fixed in the H frame 2. The telescopic cylinders 12 include telescopic cylinders I and telescopic cylinders II, two each of which are provided. The piston rod of telescopic cylinder I is connected to the left crawler beam 1, and the piston rod of telescopic cylinder II is connected to the right crawler beam 3. Telescopic cylinder I is connected to hydraulic pipeline I7, and telescopic cylinder II is connected to hydraulic pipeline II5. The left crawler beam 1 and the right crawler beam 3 are divided into two parts. A limiting hole 15 is provided, and a positioning hole is provided on the H frame 2. The limiting hole 15 and the positioning hole are matched through a positioning pin shaft 8. A pipeline bracket 6 is provided on the H frame 2, and the pipeline bracket 6 includes an upper cross bar 16 and a lower cross bar 17. The hydraulic pipeline I7 is laid on the upper cross bar 16, and the hydraulic pipeline II5 is laid between the upper cross bar 16 and the lower cross bar 17; a guard plate structure is provided in the middle of the H frame 2, and the guard plate structure includes a fixed plate 22, and the fixed plate 22 is plugged into the H frame 2.

[0032] Embodiment 2: A telescopic chassis structure applied to an excavator, such as Figure 8-Figure 10As shown, the guard plate structure includes two fixed plates 22 and a connecting plate 24, the fixed plate 22 is provided with a slot 23, the fixed plate 22 is fixedly plugged with the H frame 2 through the slot 23, and the two fixed plates 22 are connected by a connecting plate 24; the left crawler beam 1 and the right crawler beam 3 are both provided with a telescopic channel 27, the H frame 2 is provided with a telescopic guide tube 21 corresponding to the telescopic channel 27, and the telescopic guide tube 21 is slidably connected to the telescopic channel 27; the telescopic cylinder Ⅰ and the telescopic cylinder Ⅱ are both fixed in the telescopic guide tube 21, and the piston rods of the telescopic cylinder Ⅰ and the telescopic cylinder Ⅱ are fixedly connected to the telescopic guide tube 21; the telescopic channel 27 is provided with a limiting hole 15, and the telescopic guide tube 21 is provided with a positioning hole, the positioning hole Ⅰ13 and the positioning hole Ⅱ14, the positioning hole Ⅰ13 and the positioning hole Ⅱ14 are horizontally spaced, and the spacing distance is equal to the stroke of the telescopic cylinder Ⅰ or the telescopic cylinder Ⅱ; as shown Figure 11-Figure 12 As shown, the positioning pin shaft 8 is provided with a locking bolt 25 and a locking nut 26, and the locking bolt 25 and the locking nut 26 cooperate with each other; Figure 5 As shown, the lower cross bar 17 is C-shaped, with an opening facing upward, the upper cross bar 16 is welded to the lower cross bar 17, the weld is fixed by a rib plate, and the lower cross bar 17 is fixedly connected to the H frame 2. Others are the same as in the first embodiment.

[0033] Taking the telescopic operation of the left crawler beam 1 as an example, the two ends of the telescopic oil cylinder 12 are connected to the left crawler beam 1 and the H frame 2 respectively through the pin shaft. When the hydraulic oil pushes the oil cylinder to extend and lengthen, the left crawler beam 1 extends outward relative to the H frame 2; when the hydraulic oil pushes the oil cylinder to shrink and shorten, the left crawler beam 1 shrinks inward relative to the H frame 2, thereby realizing the telescopic operation of the left crawler beam 1 relative to the H frame 2. At the same time, the limit hole 15 is arranged on the left crawler beam 1, and the positioning hole Ⅰ13 and the positioning hole Ⅱ14 are arranged on the H frame 2. When the left crawler beam 1 and the H frame 2 move relative to each other so that the limit hole 15 is aligned with the positioning hole Ⅰ13, the positioning pin shaft 8 is inserted to lock the left crawler beam 1 and the H frame 2 together. At this time, the chassis is the widest and in a working state to improve the stability and safety of the whole machine. When the left crawler beam 1 and the H frame 2 move relative to each other so that the limit hole 15 is aligned with the positioning hole II 14, the positioning pin 8 is inserted to lock the left crawler beam 1 and the H frame 2 together. At this time, the chassis is the narrowest and is in a transport state to improve the convenience of transporting the entire machine.

[0034] The utility model designs a slot 23-type chassis middle guard plate structure, which makes it more convenient to replace the middle guard plate. Figure 6-Figure 7 As shown, the current intermediate guard plate is fixed on the fixed wire seat 18 by welding the fixed wire seat 18, and then fixed on the fixed wire seat 18 by the fixed bolts 19. Compared with the current intermediate guard plate structure, there is no need to weld a circle of fixed wire seat 18 on the bottom plate of the H frame 2, thereby avoiding local stress concentration on the bottom plate of the H frame 2 and improving the service life of the H frame 2.

[0035] The utility model designs a hydraulic pipeline telescopic guide structure. The specific scheme is that an upper cross bar 16 and a lower cross bar 17 are designed on the pipeline bracket 6, the right hydraulic pipeline is placed on the upper cross bar 16, and the left hydraulic pipeline passes between the upper cross bar 16 and the lower cross bar 17. Through this structure, the left and right hydraulic pipelines are arranged in layers. When the chassis retracts, the left and right crawler beams will drive the left and right hydraulic pipelines to move toward the middle. The layered arrangement design avoids collision and bending of the hydraulic pipelines, thereby increasing the service life of the hydraulic pipelines.

[0036] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A telescopic chassis structure for an excavator, comprising a left crawler beam (1) and a right crawler beam (3), an H frame (2) being arranged between the left crawler beam (1) and the right crawler beam (3), characterized in that: A telescopic oil cylinder (12) I and a telescopic oil cylinder (12) II are fixed on the H frame (2); the piston rod of the telescopic oil cylinder (12) I is connected to the left crawler beam (1), and the piston rod of the telescopic oil cylinder (12) II is connected to the right crawler beam (3); the telescopic oil cylinder (12) I is connected to a hydraulic pipeline I (7), and the telescopic oil cylinder (12) II is connected to a hydraulic pipeline II (5); the left crawler beam (1) and the right crawler beam (3) are respectively provided with a limit hole (15); the H frame (2) is provided with a positioning hole, and the limit hole (15) is provided on the H frame (2); The hole (15) and the positioning hole are matched through a positioning pin shaft (8); a pipeline bracket (6) is provided on the H frame (2); the pipeline bracket (6) includes an upper cross bar (16) and a lower cross bar (17); the hydraulic pipeline I (7) is laid on the upper cross bar (16); the hydraulic pipeline II (5) is laid between the upper cross bar (16) and the lower cross bar (17); a guard plate structure is provided in the middle of the H frame (2); the guard plate structure includes a fixing plate (22); and the fixing plate (22) is plugged into the H frame (2).

2. The telescopic chassis structure for excavators according to claim 1, characterized in that: The guard plate structure comprises two fixed plates (22) and a connecting plate (24); the fixed plates (22) are provided with a card slot (23); the fixed plates (22) are fixedly plugged into the H frame (2) via the card slot (23); and the two fixed plates (22) are connected by the connecting plate (24).

3. The telescopic chassis structure for excavators according to claim 1, characterized in that: The left crawler beam (1) and the right crawler beam (3) are both provided with a telescopic channel (27); a telescopic guide tube (21) corresponding to the telescopic channel (27) is provided on the H frame (2); the telescopic guide tube (21) is slidably connected to the telescopic channel (27); the telescopic oil cylinder (12) I and the telescopic oil cylinder (12) II are both fixed in the telescopic guide tube (21); the piston rods of the telescopic oil cylinder (12) I and the telescopic oil cylinder (12) II are fixedly connected to the telescopic guide tube (21).

4. The telescopic chassis structure for excavators according to claim 3 is characterized in that: The telescopic channel (27) is provided with a limiting hole (15), and the telescopic guide tube (21) is provided with a positioning hole, the positioning hole includes a positioning hole I (13) and a positioning hole II (14), and the positioning hole I (13) and the positioning hole II (14) are arranged horizontally at intervals, and the interval distance is equal to the stroke of the telescopic cylinder (12) I or the telescopic cylinder (12) II.

5. The telescopic chassis structure for excavators according to claim 1, characterized in that: The positioning pin shaft (8) is provided with a locking bolt (25) and a locking nut (26), and the locking bolt (25) and the locking nut (26) cooperate with each other.

6. The telescopic chassis structure for excavators according to claim 1, characterized in that: The lower cross bar (17) is C-shaped, with an opening facing upwards; the upper cross bar (16) is welded to the lower cross bar (17); the weld is fixed by a rib plate; and the lower cross bar (17) is fixedly connected to the H frame (2).

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