CN209975605U - Telescopic limit structure who gets off of mini excavator - Google Patents

Abstract

The utility model relates to a telescopic limit structure who gets off of mini excavator, which comprises a front side, the back has the main frame of cavity, still including being located the main frame left side, the left track roof beam and the right track roof beam of right side both sides, be equipped with on the left track roof beam before, two left cantilever beams of arranging after, be equipped with on the right track roof beam before, two right cantilever beams of arranging after, the both ends of locating the flexible hydro-cylinder in the main frame link to each other with left track roof beam and right track roof beam respectively, a serial communication port, reach and be equipped with a waist hole on the right cantilever beam respectively at left cantilever beam, the left cantilever beam of left track roof beam and the right cantilever beam of right track roof beam insert the cavity of main frame after, the connecting piece penetrates in the waist hole after. The utility model discloses an increase spacing waist hole on the track beam, increase spacing bolt's mode simultaneously on the main carriage frame, improved in the split type traveling system of mini about conventional track beam amount of movement inconsistent and the emergence of the complete machine operation steadying plane unbalance loading condition that leads to, simple structure, the effect is obvious.

Description

Telescopic limit structure who gets off of mini excavator

Technical Field

The utility model relates to a split type traveling system among hydraulic shovel is arranged in restriction to control the relative movement's of track beam and middle host computer workshop structure belongs to hydraulic shovel technical field.

Background

On engineering machinery excavators, especially mini excavators with the total weight of less than 3 tons, the traveling system generally adopts a split structure, namely a main frame and a left and a right crawler beams are connected by a telescopic oil cylinder to form a traveling frame of a unloading system. The extension and the contraction of the walking system can be realized by a driver operating the pilot control handle, the change of the grounding width of the whole excavator is realized, the construction operation of excavating and cleaning of the excavator in a narrow space can be met, and the walking system is formed by assembling the upper loading wheel, the drag chain wheel, the guide wheel, the driving wheel and the crawler. The track gauge of the telescopic walking system can be adjusted, so that the width of the whole walking system is variable, the telescopic walking system can solve the problem of limitation of a narrow space on the width through reduction of the track gauge, and can meet the requirement of the stability of the whole machine when the machine is in a working state through increase of the track gauge, so that the telescopic lower vehicle is in standard configuration on a mini excavator. In the mini excavator traveling system, the telescopic oil cylinder is used for conveying pressure oil of a main pump to the telescopic oil cylinder through the distribution of a main valve and a central rotary joint, so that the width of the whole excavator is changed. In the process of stretching the oil cylinder, the friction force or external resistance between the left and right track beams and the main frame is different due to the influence of the fit clearance error between the left and right track beams and the main frame or the different influence of foreign matters accumulated on the left and right track beams in the construction process. In the process of extending the oil cylinder, the crawler beam with smaller resistance on one side is easy to extend completely or more, and the crawler beam with larger resistance on the other side is not extended completely or less. The supporting surface of the whole construction operation of the excavator deviates, and the stability is greatly influenced.

The telescopic structure of the walking system of the current labyrinth excavator is mainly shown in figure 1 and comprises a main frame 1, wherein a central rotary joint 2 is arranged at the center of the main frame 1, a left crawler beam 3 and a right crawler beam 4 are respectively arranged in cavities at the left side and the right side of the main frame 1, a crawler 5 is arranged on the crawler beams, and guide wheels 6, supporting wheels 7, a walking motor 8, a driving wheel 9 and a telescopic oil cylinder 10 are further arranged on the crawler beams. The two ends of the telescopic oil cylinder 10 are fixedly hinged with the left crawler beam 3 and the right crawler beam 4 through the connecting pin shafts 11, the telescopic oil cylinder 10 receives pressure oil distributed from the central swivel joint 2 to extend or contract the telescopic oil cylinder, and the width of the walking system is extended or contracted

Because mini excavator generally is in narrow space or interior decoration operation, there is the difference about how much the material is piled up to crawler beam both sides about in the work progress, and the driver requires to increase job stabilization nature and the in-process of flexible crawler beam about, when the hydro-cylinder reaches the biggest or minimum stroke, can appear the condition that both sides crawler beam stretches out the length nonconformity. When the working device of the whole excavator rotates to a side of a track beam with a short extending side to excavate, the operation supporting surface of the whole excavator is close to the operation center of the whole excavator, so that unstable excavation and tail warping are easily caused, and the whole excavator can tip over when serious, thereby causing personal safety accidents. When such a phenomenon occurs, the driver often lowers the working radius and reduces the digging amount, and the operation causes the reduction of the working efficiency, thereby affecting the completion of the construction period and the reduction of the income of the driver. How to avoid the phenomenon is important, so that the stretching amounts of the left and right crawler beams are consistent.

Disclosure of Invention

The utility model aims at: the stretching amount of the left and right crawler beams is kept consistent in the stretching process.

In order to achieve the purpose, the technical scheme of the utility model a limit structure that miniature excavator telescopic was got off is provided, including preceding, the back has the main frame of cavity, still including being located the main frame left side, the left track roof beam and the right track roof beam of right both sides, be equipped with on the left track roof beam before, two left cantilever beams of arranging after, be equipped with on the right track roof beam before, two right cantilever beams of arranging after, the both ends of locating the flexible hydro-cylinder in the main frame link to each other with left track roof beam and right track roof beam respectively, a serial communication port, be equipped with a waist hole on left cantilever beam and right cantilever beam respectively, after the left cantilever beam of left track roof beam and the right cantilever beam of right track roof beam inserted the cavity of main frame, the connecting piece penetrates in the waist hole after running through the main frame.

Preferably, the length of the waist hole is 1/2 of the telescopic stroke of the telescopic oil cylinder.

Preferably, the connecting member is a bolt.

The utility model discloses an increase a waist hole and cooperation bolt on the cantilever structure of controlling the track roof beam, restrict the stroke of left or right track roof beam to the track roof beam overhanging distance is unanimous about guaranteeing. Even if the telescopic resistance of a certain side crawler beam is small, the side crawler beam is preferentially stretched, when the side crawler beam stretches to 1/2 of the stroke of the oil cylinder, the side crawler beam does not move due to the blocking of the bolt, then the crawler beam on the side with larger resistance starts to move to the full stroke of the oil cylinder, and the left crawler beam and the right crawler beam can stretch uniformly relative to the whole machine by adding the limiting mechanism.

During the assembly process, after the left and right crawler beams are inserted into the cavity of the main frame, the limiting bolts are inserted into the limiting holes on the upper cover plate of the main frame, the telescopic hydraulic cylinders are installed at the left and right crawler beams, and after the pipelines are connected, the stretching and the shrinking of the left and right crawler beams can be realized, the uniform movement of the left and right crawler beams at two sides can also be realized, and the phenomenon that the movement amount is smaller or not movable due to the large external resistance of the crawler beam at one side is avoided, so that the unbalanced loading condition of the whole machine is caused.

The utility model provides a not enough of prior art has been overcome to the structure, through increasing spacing waist hole on the track beam, increases spacing bolt's mode simultaneously on the main frame, has improved the conventional emergence of controlling the inconsistent and complete machine operation steadying plane unbalance loading condition that leads to of track beam amount of movement among the split type traveling system of mini, simple structure, and the effect is obvious.

Drawings

Fig. 1 is a schematic view of a lower frame telescopic arrangement structure of a conventional split mini-excavator walking system;

fig. 2 is a schematic view of a lower frame telescopic limiting structure of the split mini excavator provided in this embodiment.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

As shown in fig. 2, a schematic diagram of a lower frame telescopic limiting structure of the split mini excavator provided in this embodiment is shown. The utility model discloses on the basis of the primary structure as shown in fig. 1, increase a screw hole according to relevant positioning dimension at main frame 1 upper cover plate to increase a waist hole 13 on the cantilever beam on left track roof beam 3 and the right track roof beam 4, the length dimension of waist hole 13 is confirmed according to the 1/2 of the biggest stroke of flexible hydro-cylinder. Firstly, the cantilever parts of the left crawler beam 3 and the right crawler beam 4 are inserted into the cavity of the main frame 1, then the limiting bolts 12 are screwed, so that the limiting bolts 12 can be inserted into the waist holes 13 of the left crawler beam 3 and the right crawler beam 4, and then the telescopic oil cylinders 10 and other parts are installed.

In the process of track gauge contraction and expansion of the walking system, no matter whether the resistance on any one side of the left crawler beam 3 and the right crawler beam 4 is different, the side with small resistance can be ensured to move to the stroke 1/2 of the oil cylinder in advance, the movement resistance on the side with small resistance is increased due to the limitation of the limiting bolt 12, and when the resistance is increased to be larger than that on the other side, the original side with large resistance starts to contract or expand.

The utility model provides a because the left and right sides resistance is different, lead to the inconsistent condition of amount of movement to take place, and simple structure, only need increase spacing hole and spacing bolt can.

Claims (3)

1. The utility model provides a limit structure that telescopic getting off of mini excavator, including preceding, the back has main frame (1) of cavity, still including being located main frame (1) left side, left track roof beam (3) and right track roof beam (4) of right both sides, be equipped with preceding on left track roof beam (3), two left cantilever beams of back arrangement, be equipped with preceding on right track roof beam (4), two right cantilever beams of back arrangement, the both ends of locating flexible hydro-cylinder (10) in main frame (1) link to each other with left track roof beam (3) and right track roof beam (4) respectively, a serial communication port, be equipped with a waist hole (13) on left cantilever beam and right cantilever beam respectively, the left cantilever beam of left track roof beam (3) and the right cantilever beam of right track roof beam (4) insert the cavity of main frame (1) after, the connecting piece penetrates main frame (1) back and penetrates in waist hole (13).

2. The structure of claim 1, wherein the length of the waist hole (13) is 1/2 of the telescopic stroke of the telescopic cylinder (10).

3. The telescopic lower vehicle limit structure of a mini-excavator according to claim 1, wherein the connecting member is a bolt (12).

Images