CN218175944U

CN218175944U - Self-locking device for excavating moving arm of backhoe loader to pass dead point

Info

Publication number: CN218175944U
Application number: CN202221319737.6U
Authority: CN
Inventors: 高山铁; 董则厚; 刘宇波
Original assignee: Guizhou Jonyang Kinetics Co Ltd
Current assignee: Guizhou Jonyang Kinetics Co Ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-12-30
Anticipated expiration: 2032-05-30

Abstract

The utility model discloses a backhoe loader excavates swing arm and crosses dead point self-lock device, including swing arm 2, swing arm hydro-cylinder 3 and dipper assembly 4, its characterized in that: the lower ends of the movable arm 2 and the movable arm oil cylinder 3 are respectively hinged on hinge points A and B, the upper end of the movable arm oil cylinder 3 is hinged on the movable arm 2, and the hinge point D is set; when the three points A, B and D move to the same straight line, the position is called a dead point position E, the limit position which can be reached by the continuous backward rotation of the movable arm 2 after the movable arm 2 passes the dead point position E is called a locking point position F, and the installation distance of the movable arm oil cylinder 3 is smaller than AD-AB. The utility model discloses the problem of dead point can't be walked around to the design of current movable arm motion provides a movable arm motion that can walk around the dead point, can realize the motion auto-lock of movable arm with this kind of mechanism application on excavator equipment.

Description

Self-locking device for excavating moving arm of backhoe loader to pass dead point

Technical Field

The invention relates to a movable arm structure capable of realizing motion self-locking and a corresponding self-locking and unlocking method.

Background

In the prior excavating loader, a movable arm oil cylinder of an excavating device slowly extends out due to internal leakage of a valve body in the running process of the movable arm oil cylinder, so that a movable arm of the excavating device falls, and the movable arm can fall to the ground possibly without treatment, so that equipment runs dangerously. The reason for this problem is that after the boom of the excavator device is not retracted to the "dead point" during the retracting process, the "dead point" position refers to the position when the upper and lower hinged points of the boom cylinder and the lower hinged point of the boom are in a straight line, and at this time, the boom cylinder is not extended or retracted, so the retracting position of the boom of the general excavator does not reach the dead point position during the design, in which case the position of the boom is maintained by the boom cylinder, and no matter any cylinder can not achieve complete sealing, it appears that the boom falls down.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: aiming at the problem that the existing movable arm movement design cannot bypass dead points, the movable arm movement mechanism capable of bypassing the dead points is provided, and the movement self-locking of the movable arm can be realized by applying the mechanism on an excavator working device.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an excavate movable arm and cross dead point self-locking structure, includes movable arm 2, movable arm hydro-cylinder 3 and dipper assembly 4, its characterized in that: the lower ends of the movable arm 2 and the movable arm oil cylinder 3 are respectively hinged on hinge points A and B, the upper end of the movable arm oil cylinder 3 is hinged on the movable arm 2, and the hinge point D is set; when the three points A, B and D move to the same straight line, the position is called a dead point position E, the movable arm 2 continuously rotates backwards after passing the dead point position E to reach a limit position called a locking point position F, and the installation distance of the movable arm oil cylinder 3 is smaller than AD-AB.

When the movable arm 2 rotates to the locking point position F, the movable arm is blocked by the hinge point B and cannot rotate continuously.

When the boom 2 is located at the dead point position E, unfolding the arm assembly 4 causes the boom 2 to have a tendency to rotate forward.

When the boom 2 is located at the dead point position E, the boom 2 tends to rotate backward by retracting the arm assembly 4.

The movable arm 2 adopts a semi-closed structure form, and the back part of the movable arm leaves enough cavities to meet the moving space crossing dead points.

A shock absorption rubber mat 6 is installed in a cavity in the back of the movable arm 2, and when the movable arm 2 rotates to the locking point position F, the shock absorption rubber mat 6 is matched with the hinge point B.

When the boom 2 is located at the dead point position E, the boom 2 tends to rotate forward by unfolding the boom assembly 4 and the bucket assembly 5, and the boom 2 tends to rotate backward by folding the boom assembly 4 and the bucket assembly 5.

The hinged points A and B are positioned at the front end of the rotating arm 1, the projection of the hinged point B on the horizontal plane of the hinged point A is a point C, and the angle CAB is less than 90 degrees.

A control method of a self-locking structure for excavating a dead point of a movable arm comprises the following steps of recovering self-locking action and releasing the self-locking action, wherein the recovering self-locking action comprises the following steps: controlling the movable arm oil cylinder 3 to contract quickly, lifting the movable arm 2, flushing a dead point E by using inertia, and reaching a self-locking position F;

releasing the self-locking action: firstly, the bucket rod assembly 4 is opened to extend forwards, the movable arm oil cylinder 3 is controlled to contract to the limit position, at the moment, the movable arm 2 is located at the dead point position E, and then the movable arm oil cylinder is operated to extend out to complete unlocking.

Before the recovery self-locking action is executed, the movable arm 2 is firstly swung.

The invention has the beneficial effects that:

the self-locking mechanism breaks through a working dead point of the structure of the movable arm moving mechanism, reversely utilizes the falling of the movable arm oil cylinder to achieve the purpose of self-locking of the movable arm, the movable arm adopts a semi-closed structure form, and enough cavities are reserved at the back to meet the requirement of a moving space crossing the dead point. The length of the movable arm is matched with the working range, and the arrangement of the hinge point position of the movable arm oil cylinder meets the requirements of the maximum excavation depth and the minimum installation distance of the oil cylinder.

The shock absorption rubber mat is arranged in the cavity on the back of the movable arm, so that the impact of the hinge point C when the movable arm reaches the locking position can be effectively reduced.

The mounting distance of the oil cylinder is only required to be changed, the adjustment of a large structural form is not needed, and the oil cylinder is convenient to produce and process, simple and practical.

Drawings

Fig. 1 is a schematic structural view of an excavator working apparatus.

FIG. 2 is a schematic view of the structure of the back of the boom

Fig. 3 is a schematic view of boom movement.

Fig. 4 is a boom dead center diagram.

Fig. 5 is a schematic view of boom self-locking.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The embodiment is applied to a working device of an excavating loader, the lower ends of a movable arm 2 and a movable arm oil cylinder 3 of the working device are respectively fixed on hinge points A and B, the upper end of the movable arm oil cylinder 3 is hinged on the movable arm 2, and the hinge point is D. As shown in fig. 1, the excavating apparatus includes a boom 1, a boom 2, a boom cylinder 3, an arm assembly 4, a bucket assembly 5, and the like. The lower hinge point of the movable arm 2 is hinged to the lower hinge point of the rotating arm 1 through a pin shaft, the movable arm oil cylinder 3 is hinged to the hinge point of the movable arm oil cylinder of the movable arm 2 and the upper hinge point of the rotating arm 1 through a pin shaft, the bucket assembly 4 is hinged to the movable arm 2, and the bucket assembly 5 is hinged to the bucket rod assembly through a four-bar linkage. This construction is similar to a conventional excavating device.

As shown in fig. 2. The movable arm 2 adopts a semi-closed structure form, and the back part of the movable arm leaves enough cavities to meet the moving space crossing dead points. The length of the movable arm is matched with the working range, and the arrangement of the hinged point position of the movable arm oil cylinder meets the requirements of the maximum digging depth and the minimum mounting distance of the oil cylinder; a damping rubber pad 6 is installed in a cavity on the back of the movable arm 2, the damping rubber pad 6 is fixed through a gasket 7 and a bolt 8, and the impact of the upper hinge point limiting surface of the movable arm 2 and the movable arm 1 is relieved. The movable arm 2 is provided with an arm assembly 4, and the arm assembly is provided with a bucket assembly 5.

As shown in fig. 3, when the boom cylinder 3 is located on the left side of the AE line, the boom cylinder 3 extends due to internal leakage of the valve body, the boom 2 rotates counterclockwise, the bucket 5 lands for a long time, and a danger is caused during traveling.

As shown in fig. 4, when the boom cylinder 3 coincides with the AE line, the boom cylinder 3 passes through the dead point, and at this time, the boom cylinder 3 is not effective in both extension and retraction, and the boom 2 does not operate unless an external force is applied.

As shown in fig. 5, when the boom cylinder 3 is located on the right side of the AE line, the boom 2 goes over the dead point, the boom cylinder 3 extends due to internal leakage of the valve body, the boom 2 rotates clockwise, and when the cushion 6 on the boom 2 rotates to the limit surface of the outer edge of the hinge point on the boom 1, the boom 2 is limited to rotate no longer, and the purpose of self-locking is achieved.

The self-locking process of the movable arm 2 is as follows: firstly, the bucket rod is opened, the movable arm is in a downward-placing state, the movable arm oil cylinder is operated to quickly contract, the movable arm is lifted, inertia is utilized to rush through a dead point to reach a self-locking position, and then the bucket and the bucket rod are recovered to a running state.

The unlocking process of the boom 2 is as follows: the bucket rod is opened to extend forwards, the movable arm oil cylinder is operated to contract to the limit position, and then the movable arm oil cylinder is operated to extend out, so that the movable arm can be unlocked. The moving direction of the movable arm is guided by using the forward-extending gravity centers of the bucket rod and the bucket, so that the movable arm is enabled to extend forwards beyond a dead point and is unlocked.

Claims

1. The utility model provides a backhoe loader excavates movable arm and crosses dead point self-lock device, includes movable arm (2), movable arm hydro-cylinder (3) and dipper assembly (4), its characterized in that: the lower ends of the movable arm (2) and the movable arm oil cylinder (3) are respectively hinged on hinge points A and B, the upper end of the movable arm oil cylinder (3) is hinged on the movable arm (2), and the hinge point D is a hinge point; when the three points A, B and D move to the same straight line, the position is called a dead point position E, and the limit position which can be reached by the continuous backward rotation of the movable arm (2) after the movable arm crosses the dead point position E is called a locking point position F; the mounting distance of the movable arm oil cylinder (3) is smaller than AD-AB.

2. The backhoe loader excavating boom over-dead-center self-locking device of claim 1, wherein: when the movable arm (2) rotates to the locking point position F, the movable arm is blocked by the hinge point B and cannot rotate continuously.

3. The backhoe loader excavating boom over-dead-point self-locking device according to claim 1, characterized in that: when the movable arm (2) is located at the dead point position E, the movable arm (2) tends to rotate forwards when the bucket rod assembly (4) is unfolded.

4. The backhoe loader excavating boom over-dead-center self-locking device of claim 1, wherein: when the movable arm (2) is located at the dead point position E, the movable arm (2) tends to rotate backwards by retracting the arm assembly (4).

5. The backhoe loader excavating boom over-dead-center self-locking device of claim 1, wherein: the movable arm (2) adopts a semi-closed structure form, and the back part of the movable arm leaves enough cavities to meet the moving space crossing dead points.

6. The backhoe loader excavating boom over-dead-center self-locking device of claim 5, wherein: a damping rubber pad (6) is installed in a cavity in the back of the movable arm (2), and the damping rubber pad (6) is matched with the hinge point B when the movable arm (2) rotates to the locking point position F.

7. The excavating loader excavating boom over-dead-center self-locking device of claim 4 or 5, wherein: a bucket assembly (5) is installed at the front end of the arm assembly (4), when the movable arm (2) is located at the dead point position E, the movable arm (2) tends to rotate forwards when the arm assembly (4) and the bucket assembly (5) are unfolded, and the movable arm (2) tends to rotate backwards when the arm assembly (4) and the bucket assembly (5) are folded.

8. The backhoe loader excavating boom over-dead-center self-locking apparatus of any one of claims 1 to 6, wherein: the hinge points A and B are positioned at the front end of the rotating arm (1), the projection of the hinge point B on the horizontal plane of the hinge point A is a point C, and the angle CAB is less than 90 degrees.