CN112095689A

CN112095689A - Lifting method for vertical lifting track of skid steer loader

Info

Publication number: CN112095689A
Application number: CN202011037691.4A
Authority: CN
Inventors: 魏勋利; 沈勇; 宋红兵; 许�鹏; 李志刚
Original assignee: Science and Technology Branch of XCMG
Current assignee: Science and Technology Branch of XCMG
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2020-12-18

Abstract

The invention discloses a method for lifting a vertical lifting track of a skid steer loader. A front-end hinge pin of a working device of the skid steer loader forms a forward-extending wavy track curve in the lifting motion process, and the track curve is in four stages; the first stage has a large forward movement, the second stage has a backward movement relative to the end of the first stage, the third stage tilts forward relative to the second stage, and finally the fourth stage forms a backward movement relative to the third stage. The first stage trajectory profile has a maximum protrusion distance and a height greater than 1/3 of the entire trajectory profile height. The second stage, the third stage and the fourth stage are vertical line segments of the track curve. The third stage end position is the maximum forward extending position in the whole track curve. The invention can realize higher vertical linearity, greatly reduce the horizontal offset of the original curve, greatly improve the stability of the lifting work of the whole machine and avoid the material from spilling in the lifting process.

Description

Lifting method for vertical lifting track of skid steer loader

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a method for lifting a vertical lifting track of a skid steer loader.

Background

The skid steer loader is wheel type special chassis equipment for realizing vehicle steering by utilizing linear velocity difference of wheels at two sides, and is mainly used for occasions with narrow operation field, uneven ground and frequent operation content change.

The working device of the traditional skid steer loader is radial lifting, specifically, the rear end of a movable arm is hinged with a frame, under the action of a driving oil cylinder, the front end of the movable arm moves around an arc taking a hinged point of the movable arm and the frame as a circle center, the front end of the movable arm extends forwards in the horizontal direction and then moves backwards, and the lifting mechanism has the defects of low lifting capacity and small lifting height. In order to improve the problems, a sliding mainstream manufacturer invents a vertical lifting working device, namely, the front end of a movable arm is similar to a vertical trajectory line in the lifting process through the design of a complex connecting rod mechanism, the lifting height is improved, and the rated load capacity is increased.

The linearity of a vertical line segment in a vertical lifting track is an important index for judging the design performance of the lifting mechanism. Currently, there are many vertical lifting mechanism designs for skid steer loaders, and the trajectory formed by the complicated link mechanism design is mostly a W-shaped curve (as described in patent US7578651B2 of CAT of the skid steer loader main flow manufacturer), and the trajectory curve is characterized in that the end of the first stage of the trajectory is the foremost end of the whole trajectory curve.

The disadvantages of the prior art are as follows:

the tail end of the formed track in the first stage is the foremost end of the whole track curve, and the lifting link mechanism has poor vertical section linearity, large horizontal offset, unstable lifting process and more material scattering.

Disclosure of Invention

The invention aims to provide a method for lifting a vertical lifting track of a skid steer loader with good vertical section linearity.

The invention is realized by the following technical scheme: a lifting method of a vertical lifting track of a skid steer loader comprises the following steps;

a front-end hinge pin of a working device of the skid steer loader forms a forward-extending wavy track curve in the lifting motion process, and the track curve is in four stages;

the first stage is as follows: the front end hinge pin extends forwards at the lowest initial position and is lifted to the tail end position of the first stage;

and a second stage: the first-stage end position is used as a second-stage initial position, and the front-end hinge pin is inclined backwards and lifted to the second-stage end position at the second-stage initial position;

and a third stage: the end position of the second stage is used as the initial position of the third stage, and the front end hinge pin is inclined forwards and lifted to the end position of the third stage at the initial position of the third stage;

a fourth stage: the end position of the third stage is used as the initial position of the fourth stage, and the front-end hinge pin is inclined backwards to be lifted to the end position of the fourth stage at the initial position of the fourth stage;

the tail end position of the third stage is positioned in front of the track curves of the first stage, the second stage and the fourth stage and is the maximum forward extending position in the whole track curve.

Preferably: the first stage trajectory profile has a maximum protrusion distance, the first stage trajectory profile height is greater than 1/3 for the entire trajectory profile height, and the lowest initial position of the first stage is near the ground.

Preferably: the second stage, the third stage and the fourth stage are vertical line segments of the track curve.

Compared with the prior art, the invention has the beneficial effects that: the wave-shaped track curve of the working device realizes smaller offset at the vertical line section, so that the stability of the lifting process is improved, and the scattering of materials caused by horizontal swinging in the lifting process can be well avoided.

Advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a working device capable of realizing a forward-extending wave-shaped track curve according to the invention;

FIG. 2 is a schematic diagram of a lift trajectory curve of the present invention.

Detailed Description

To facilitate further understanding of the method for lifting a vertical lifting trajectory of a skid steer loader of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.

Referring to fig. 1 and fig. 2, a method for lifting a vertical lifting trajectory of a skid steer loader,

comprises the following steps;

a front end hinge pin of a working device of the skid steer loader forms a forward-extending wave-shaped track curve 7 in the lifting motion process, and the track curve 7 is in four stages;

the first stage is as follows: the leading hinge pin extends forward at a lowermost initial position (point 71) to a first phase end position (point 72); the first stage trajectory profile has a maximum protrusion distance, the first stage trajectory profile height is greater than the entire trajectory profile height 1/3, the lowest initial position (point 71) of the first stage is near the ground;

the second stage, the third stage and the fourth stage are vertical line segments of the track curve;

and a second stage: the first stage end position (point 72) serves as the second stage initial position, in which the leading hinge pin is tilted back to the second stage end position (point 73);

and a third stage: a second-stage end position (point 73) as a third-stage initial position at which the front-end hinge pin is forwardly tilted to a third-stage end position (point 74); the tail end position of the third stage is positioned in front of the track curves of the first stage, the second stage and the fourth stage and is the maximum forward extending position in the whole track curve;

a fourth stage: a fourth stage end position (point 74) at which the front hinge pin is tilted back to the fourth stage end position (point 75);

by means of an intelligent optimization algorithm and the like, the horizontal fluctuation range of the vertical line segment of the track curve 7 is controlled to be about 10mm, and the vertical linearity is quite high.

Referring again to fig. 1, the present embodiment provides a skid steer loader work apparatus sized and configured such that the leading hinge pin forms the trajectory curve 7;

the working device is arranged on a frame of the skid steer loader, has a longitudinal centrosymmetric structure, and comprises a rear connecting rod 1, a front connecting rod 2, a movable arm 3 and a driving oil cylinder 4. The second hinge point 12 of the rear link 1 is hinged to the first hinge point 31 of the movable arm 3, and the first hinge point 11 of the rear link 1 is hinged to the first hinge point 51 of the rear portion of the frame 5. The first hinge point 21 of the front link 2 is hinge-connected to the upper second hinge point 52 of the frame 5, and the second hinge point 22 of the front link 2 is hinge-connected to the second hinge point 32 of the boom 3. The first hinge point 41 at the bottom end of the movable arm cylinder 4 is hinged with the third hinge point 53 at the rear lower part of the frame 5. A downward extending supporting device 33 is arranged in the middle of the movable arm 3, and a second hinge point 42 at the upper end of the movable arm cylinder 4 is hinged with the downward extending supporting device 33 in the middle of the movable arm 3. The rear connecting rod 1, the front connecting rod 2 and the movable arm 3 form a four-bar linkage through hinging, and under the driving of the driving oil cylinder 4, a front end hinge pin point 34 of the movable arm 3 forms an approximately vertical track curve 7 in the lifting process.

Claims

1. A lifting method for a vertical lifting track of a skid steer loader is characterized by comprising the following steps: comprises the following steps;

2. The method of claim 1, wherein the method comprises the steps of: the first stage trajectory profile has a maximum protrusion distance, the first stage trajectory profile height is greater than 1/3 for the entire trajectory profile height, and the lowest initial position of the first stage is near the ground.

3. The method of claim 1, wherein the method comprises the steps of: the second stage, the third stage and the fourth stage are vertical line segments of the track curve.