Extensible chassis of excavator

Abstract

The utility model discloses a telescopic chassis of an excavator, which comprises a bottom frame, the bottom frame comprises a bottom frame body and two hollow outer sliding rails, and the two outer sliding rails are arranged at two opposite ends of the bottom frame body and extend along a first direction; a left track beam and a right track beam which extend in the second direction are arranged at the two opposite ends of the bottom frame in the first direction correspondingly, the first direction and the second direction are located on the same horizontal plane and are perpendicularly arranged, and the left track beam and the right track beam face the bottom frame correspondingly and are provided with two left inner sliding rails and two right inner sliding rails which extend in the first direction. The two left inner sliding rails and the two right inner sliding rails are correspondingly inserted into the two outer sliding rails in a sliding mode respectively. Adjusting bolts are arranged on the side portions of the two ends of the outer sliding rail in the first direction, penetrate into the outer sliding rail in the second direction and abut against the outer wall of the corresponding left inner sliding rail or the outer wall of the corresponding right inner sliding rail. The parallelism of the left track beam and the right track beam is guaranteed by adjusting the gap, so that the advancing path of the excavator is prevented from deviating, and the service life of the chassis is prolonged.

Description

Technical Field

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

[0002] In recent years, the development of construction machinery has been particularly rapid for excavators, which have become one of the most important types of construction machinery. Furthermore, with the acceleration of China's urbanization process, micro and small excavators, which combine flexibility, versatility, and a wide range of applications, are increasingly being used. As an essential component of an excavator, the chassis is crucial to its performance, and therefore, its function is crucial.

[0003] The chassis generally consists of an underframe and left and right crawler beams mounted on either side of the underframe. In traditional excavator undercarriage structures, the left and right crawler beams are welded to the left and right sides of the underframe to form an integral crawler excavator chassis. This integral welded structure prevents adjustment of the distance between the underframe and the left and right crawler beams, limiting the excavator's maneuverability and operational stability. Furthermore, the underframe and left and right crawler beams cannot be separated, making the excavator unable to pass through narrow passages, limiting its use cases.

[0004] To this end, Chinese patent CN216713180U discloses a chassis telescopic mechanism for a small excavator, including a main board mechanism, a left telescopic mechanism, a right telescopic mechanism and two hydraulic cylinders. The left telescopic mechanism and the right telescopic mechanism are respectively located on one side of the main board mechanism, and the two hydraulic cylinders are horizontally arranged at the bottom of the main board mechanism, and the two hydraulic cylinders are arranged in opposite directions. One end of the two hydraulic cylinders is penetrated by a hydraulic shaft, and the ends of the two hydraulic shafts away from the hydraulic cylinders are respectively connected to the left telescopic mechanism and the right telescopic mechanism. The two hydraulic shafts can be controlled to extend and retract respectively by the two hydraulic cylinders, thereby driving the left telescopic mechanism and the right telescopic mechanism to move respectively, so that the mechanism can perform telescopic operations, thereby changing the body shape of the mechanism, so that the mechanism can adjust the width of the mechanism during actual operation.

[0005] Although the above solution realizes the retractable function of the chassis, during the long-term movement of the excavator, due to the change of the connection gap, the left and right crawler beams are easily connected to the underframe in an "inward-facing" or "outward-facing" position, causing the excavator's travel path to deviate and affecting the service life of the chassis. Utility Model Content

[0006] In order to overcome at least one of the defects described in the above-mentioned prior art, the purpose of the present utility model is to provide a retractable chassis for an excavator, so as to ensure the parallelism of the left crawler beam and the right crawler beam by adjusting the gap, thereby avoiding the deviation of the excavator's travel path and improving the service life of the chassis.

[0007] The technical solution adopted by the present invention to solve the problem is:

[0008] A telescopic chassis for an excavator, comprising:

[0009] The chassis comprises a chassis body and two hollow outer slide rails, wherein the two outer slide rails are provided at opposite ends of the chassis body and both extend along a first direction;

[0010] A left crawler beam and a right crawler beam extending in the second direction are respectively provided at opposite ends of the chassis in the first direction. The first direction and the second direction are in the same horizontal plane and are arranged vertically. The left crawler beam and the right crawler beam are respectively provided with two left inner slide rails and two right inner slide rails extending in the first direction toward the chassis. The two left inner slide rails and the two right inner slide rails are respectively slidably inserted into the two outer slide rails.

[0011] Adjustment bolts are provided on both end sides of the outer slide rail in the first direction. The adjustment bolts penetrate into the outer slide rail along the second direction and abut against the outer wall of the corresponding left inner slide rail or right inner slide rail.

[0012] As an optional implementation, in the present invention, the left inner rail and the right inner rail in the same outer rail are of a centrally symmetrical L-shaped structure, so that the left inner rail and the right inner rail are arranged in an alternating and overlapping manner.

[0013] As an optional implementation, in the present invention, the left inner slide rail and the right inner slide rail in the same outer slide rail are slidably plug-connected.

[0014] As an optional embodiment, in the present invention, both ends of the outer slide rail in the first direction are provided with reinforcement plates, and the adjusting bolt passes through the reinforcement plate into the outer slide rail along the second direction and abuts against the outer wall of the corresponding left inner slide rail or right inner slide rail.

[0015] As an optional embodiment, in the present invention, the left inner slide rail and the right inner slide rail are respectively provided with a left slide groove and a right slide groove, and the base frame is provided with limiting bolts corresponding to the left slide groove and the right slide groove. The limiting bolts pass through the outer slide rail and are clamped in the corresponding left slide groove or right slide groove.

[0016] As an optional implementation, in the present invention, the chassis is provided with a limiting piece corresponding to the limiting bolt, and the limiting bolt passes through the limiting piece into the outer slide rail and is clamped in the corresponding left slide groove or right slide groove.

[0017] As an optional implementation, in the present invention, the underframe is connected to the left crawler beam and the right crawler beam via a telescopic oil cylinder.

[0018] As an optional embodiment, in the present invention, the telescopic cylinder is fixed to the middle of the chassis, and the piston rod of the telescopic cylinder is connected to the middle of the corresponding left crawler beam or the middle of the right crawler beam.

[0019] As an optional embodiment, in the present invention, the left track beam and the right track beam are respectively provided with a left connecting part and a right connecting part corresponding to the piston rod of the telescopic cylinder, and the piston rod of the telescopic cylinder is connected to the corresponding left connecting part or right connecting part through a pin shaft.

[0020] As an optional embodiment, in the present invention, the pin is fixedly connected to the corresponding left connecting part or right connecting part by a bolt, and a washer is provided between the bolt and the corresponding left connecting part or right connecting part.

[0021] The beneficial effects of the excavator retractable chassis provided by the utility model are as follows:

[0022] By placing an adjustment bolt against the outer wall of the corresponding left or right inner rail, the clearance between the left and right inner rails within the outer rails can be adjusted by turning the adjustment bolt to ensure parallelism between the left and right track beams, thereby preventing deviation in the excavator's travel path and extending the service life of the chassis. This adjustable clearance structure also reduces the manufacturing precision requirements for the left and right inner rails, helping to reduce manufacturing costs and difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the telescopic chassis of an excavator according to the present invention;

[0024] Figure 2 This is an exploded view of the telescopic chassis of the excavator of the present invention;

[0025] Figure 3 This is a schematic structural diagram of the left crawler beam of the present utility model;

[0026] Figure 4 This is a schematic structural diagram of the right crawler beam of the present utility model;

[0027] Figure 5 It is a structural schematic diagram of the chassis of the present utility model.

[0028] The meanings of the reference numerals are as follows:

[0029] 1. Underframe; 11. Underframe body; 12. Outer slide rail; 13. Reinforcement plate; 2. Left track beam; 21. Left inner slide rail; 211. Left slide groove; 22. Left connecting part; 3. Right track beam; 31. Right inner slide rail; 311. Right slide groove; 32. Right connecting part; 4. Adjusting bolt; 5. Limit bolt; 6. Limit piece; 7. Telescopic cylinder; 8. Pin; 9. Bolt; 10. Washer. DETAILED DESCRIPTION

[0030] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] The utility model provides a telescopic chassis for an excavator. Figure 1 and Figure 5 The chassis 1 includes a chassis body 11 and two hollow outer slide rails 12. The two outer slide rails 12 are provided at opposite ends of the chassis body 11 and both extend along a first direction.

[0034] Taking the direction of travel of the excavator as an example, the first direction is the left-right direction, and the two outer slide rails 12 are spaced apart from each other in the front and rear direction, and the front-rear direction can be the second direction. The two outer slide rails 12 are hollowed to form a sliding channel for realizing telescopic movement.

[0035] See Figure 1 、 Figure 3 and Figure 4 A left crawler beam 2 and a right crawler beam 3 extending along the second direction are respectively provided at the opposite ends of the first direction of the chassis 1. The first direction and the second direction are in the same horizontal plane and are arranged vertically. The left crawler beam 2 and the right crawler beam 3 are respectively provided with two left inner slide rails 21 and two right inner slide rails 31 extending along the first direction toward the chassis 1. The two left inner slide rails 21 and the two right inner slide rails 31 are respectively slidably inserted into the two outer slide rails 12.

[0036] The two left inner slide rails 21 are inserted into the left ends of the two outer slide rails 12, and the two right inner slide rails 31 are inserted into the right ends of the two outer slide rails 12. Moreover, the left inner slide rail 21 and the right inner slide rail 31 in the same outer slide rail 12 slide synchronously toward or away from each other without interfering with each other. At the same time, the sliding actions in the two outer slide rails 12 are synchronized, so that the left track beam 2 and the right track beam 3 move toward or away from each other synchronously, thereby realizing the retractability of the chassis.

[0037] See Figure 1 and Figure 2 Adjustment bolts 4 are provided at both ends of the outer rail 12 in the first direction. These bolts 4 extend into the outer rail 12 along the second direction and abut the outer wall of the corresponding left inner rail 21 or right inner rail 31. By placing the adjustment bolts 4 against the outer wall of the corresponding left inner rail 21 or right inner rail 31, the clearance between the left and right inner rails 21 and 31 within the outer rail 12 can be adjusted by tightening the adjustment bolts 4. This ensures the parallelism of the left and right crawler beams 2 and 3, thereby preventing deviations in the excavator's travel path and extending the service life of the chassis. Furthermore, this adjustable clearance structure requires lower manufacturing precision for the left and right inner rails 21 and 31, thereby reducing manufacturing costs and difficulty.

[0038] See Figure 3 and Figure 4 The left inner rail 21 and the right inner rail 31 within the same outer rail 12 are configured as a centrally symmetrical L-shaped structure, such that the left inner rail 21 and the right inner rail 31 are arranged in an overlapping, staggered arrangement. Alternatively, the left inner rail 21 and the right inner rail 31 within the same outer rail 12 can be slidably connected. In this manner, based on the gap adjustment by adjusting bolts 4, the corresponding sliding limiter or sliding guide arrangement between the left inner rail 21 and the right inner rail 31 helps further ensure the parallelism of the left crawler beam 2 and the right crawler beam 3, and ensures that the underframe 1, the left crawler beam 2, and the right crawler beam 3 are on the same horizontal plane, further improving the service life of the chassis.

[0039] In addition, see Figure 5 Reinforcement plates 13 are sleeved on both ends of the outer rail 12 in the first direction. The adjustment bolt 4 passes through the reinforcement plates 13 and extends into the outer rail 12 in the second direction, abutting the outer wall of the corresponding left inner rail 21 or right inner rail 31. The provision of the reinforcement plates 13 helps to increase the strength of the outer rail 12, preventing local cracking due to excessive force on the outer rail 12, thereby further extending the service life of the chassis.

[0040] Based on the above structure, combined Figure 1-5 The assembly structure between the underframe 1, the left crawler beam 2 and the right crawler beam 3 will be described in detail.

[0041] The left inner slide rail 21 and the right inner slide rail 31 are respectively provided with a left slide groove 211 and a right slide groove 311. The base frame 1 is provided with a limiting bolt 5 corresponding to the left slide groove 211 and the right slide groove 311. The limiting bolt 5 passes through the outer slide rail 12 and is clamped in the corresponding left slide groove 211 or right slide groove 311.

[0042] When the left inner slide rail 21 and the right inner slide rail 31 slide in the corresponding outer slide rail 12, the left slide groove 211 and the right slide groove 311 slide relative to the corresponding limit bolt 5, so that the sliding of the left inner slide rail 21 and the right inner slide rail 31 is guided by the cooperation between the limit bolt 5 and the corresponding slide groove 211 or the right slide groove 311, which is beneficial to ensure the parallelism of the extension and contraction of the left crawler beam 2 and the right crawler beam 3.

[0043] The chassis 1 is provided with a stopper 6 corresponding to the stopper bolt 5. The stopper bolt 5 passes through the outer slide rail 12 through the stopper 6 and is secured within the corresponding left slide groove 211 or right slide groove 311. The stopper 6 has a through hole adapted for the stopper bolt 5 to pass through. Thus, the main rod of the stopper bolt 5 is within the stopper 6, thereby guiding and limiting the installation of the stopper bolt 5 through the stopper 6, thereby ensuring accurate installation of the stopper bolt 5 within the corresponding left slide groove 211 or right slide groove 311.

[0044] In addition, the underframe 1 is connected to the left crawler beam 2 and the right crawler beam 3 through a telescopic cylinder 7. The telescopic cylinder 7 synchronizes the telescopic actions of the left crawler beam 2 and the right crawler beam 3 to ensure that the left crawler beam 2 and the right crawler beam 3 are synchronously telescoped and extended in parallel.

[0045] The telescopic cylinder 7 is fixed to the middle of the chassis 1, and the piston rod of the telescopic cylinder 7 is connected to the middle of the corresponding left crawler beam 2 or the middle of the right crawler beam 3. The middle location of the telescopic cylinder 7 facilitates stable telescopic expansion and contraction of the left and right crawler beams 2 and 3, prevents tilting of the left and right crawler beams 2 and 3, and ensures synchronous and parallel expansion and contraction of the left and right crawler beams 2 and 3.

[0046] Specifically, the left track beam 2 and the right track beam 3 are provided with a left connecting portion 22 and a right connecting portion 32 corresponding to the piston rod of the telescopic cylinder 7, respectively. The piston rod of the telescopic cylinder 7 is connected to the corresponding left connecting portion 22 or right connecting portion 32 via a pin 8. In this way, the fixed connection between the telescopic cylinder 7 and the corresponding left track beam 2 and right track beam 3 is achieved via the pin 8.

[0047] Furthermore, the pin 8 is fixedly connected to the corresponding left connecting portion 22 or right connecting portion 32 via a bolt 9, with a washer 10 disposed between the bolt 9 and the corresponding left connecting portion 22 or right connecting portion 32. The provision of the bolt 9 and washer 10 further enhances the stability of the connection between the piston rod of the telescopic cylinder 7, the corresponding left and right crawler beams 2 and 3, and the pin 8, thereby ensuring stable extension and retraction of the chassis.

[0048] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A retractable chassis for an excavator, characterized in that: include: A chassis, comprising a chassis body and two hollow outer slide rails, wherein the two outer slide rails are provided at opposite ends of the chassis body and both extend along a first direction; A left crawler beam and a right crawler beam extending in a second direction are respectively provided at opposite ends of the chassis in the first direction, the first direction and the second direction are in the same horizontal plane and are arranged vertically, the left crawler beam and the right crawler beam are respectively provided with two left inner slide rails and two right inner slide rails extending in the first direction facing the chassis, the two left inner slide rails and the two right inner slide rails are respectively slidably inserted into the two outer slide rails; Adjustment bolts are provided on both end sides of the outer slide rail in the first direction. The adjustment bolts penetrate into the outer slide rail along the second direction and abut against the outer wall of the corresponding left inner slide rail or right inner slide rail.

2. The excavator retractable chassis according to claim 1, characterized in that: The left inner slide rail and the right inner slide rail in the same outer slide rail are of a centrosymmetrical L-shaped structure, so that the left inner slide rail and the right inner slide rail are arranged in an alternating and overlapping manner.

3. The excavator retractable chassis according to claim 1, characterized in that: The left inner slide rail and the right inner slide rail in the same outer slide rail are slidably plug-connected.

4. The telescopic chassis for an excavator according to any one of claims 1 to 3, characterized in that: Both ends of the outer slide rail in the first direction are sleeved with reinforcement plates, and the adjustment bolt passes through the reinforcement plates and enters the outer slide rail along the second direction and abuts against the outer wall of the corresponding left inner slide rail or right inner slide rail.

5. The telescopic chassis for an excavator according to any one of claims 1 to 3, characterized in that: The left inner slide rail and the right inner slide rail are respectively provided with a left slide groove and a right slide groove, and the base frame is provided with limiting bolts corresponding to the left slide groove and the right slide groove. The limiting bolts penetrate into the outer slide rail and are clamped in the corresponding left slide groove or the right slide groove.

6. The telescopic chassis of an excavator according to claim 5, characterized in that: The chassis is provided with a limiting piece corresponding to the limiting bolt, and the limiting bolt passes through the limiting piece into the outer slide rail and is clamped in the corresponding left slide groove or the right slide groove.

7. The telescopic chassis for an excavator according to any one of claims 1 to 3, characterized in that: The underframe is connected to the left crawler beam and the right crawler beam via a telescopic oil cylinder.

8. The telescopic chassis of an excavator according to claim 7, characterized in that: The telescopic oil cylinder is fixed to the middle part of the chassis, and the piston rod of the telescopic oil cylinder is connected to the middle part of the corresponding left crawler beam or the middle part of the right crawler beam.

9. The telescopic chassis of an excavator according to claim 8, characterized in that: The left crawler beam and the right crawler beam are respectively provided with a left connecting portion and a right connecting portion corresponding to the piston rod of the telescopic oil cylinder, and the piston rod of the telescopic oil cylinder is connected to the corresponding left connecting portion or right connecting portion through a pin shaft.

10. The telescopic chassis of an excavator according to claim 9, characterized in that: The pin shaft is fixedly connected to the corresponding left connecting part or right connecting part through a bolt, and a washer is provided between the bolt and the corresponding left connecting part or right connecting part.

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