Electric control automatic limiting device for lifting of mine wide-body dumper

Abstract

An electric control automatic limiting device for lifting of a mine wide-body dumper comprises a trigger piece installed on a lifting cylinder, a first travel switch, a second travel switch and a vehicle-mounted computer. And the vehicle-mounted computer judges that the cargo compartment descends in place according to the cooperation of the trigger piece and the first travel switch, and judges that the cargo compartment is lifted in place according to the cooperation of the trigger piece and the second travel switch. The limiting device is simple in structure, convenient to install and maintain, low in production cost and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of dump trucks, in particular to an electric-controlled automatic limiting device for lifting a wide-body dump truck of a mine. Background Art

[0002] Domestic mining is currently experiencing rapid growth, and a wide variety of mining machinery is flourishing. Wide-body dump trucks, with their light weight and high payload capabilities, are highly favored by major mines. However, due to the harsh working environment and high labor intensity in mines, it is becoming increasingly difficult to recruit drivers for wide-body trucks. Therefore, autonomous driving has become a development trend in mining vehicles.

[0003] During the operation of unmanned driving, the lifting of the cargo compartment stops automatically when it is lifted into place, and stops automatically when it is lowered into place, which requires an electronically controlled limit device to achieve this. At present, a travel switch is usually installed below the front end of the cargo compartment on the outside of the middle part of the frame to serve as a trigger switch for the cargo compartment to be lowered into place, and a travel switch is installed at the rear end of the frame as a trigger switch for lifting into place; or two travel switches are installed at the rear end of the frame, and the trigger plate is installed on the cargo compartment; or the angle detected by the lifting angle sensor is used for limiting. Due to the problem of the installation position, the above-mentioned travel switch is easily damaged by being hit by stones, and is also easily covered by mud, which affects its operation; when the angle sensor is used to detect the angle limit, the cargo compartment vibrates violently when it is lifted into place, which easily causes the sensor to have zero drift, resulting in false triggering. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an electrically controlled automatic limit device for lifting a wide-body dump truck of a mine. The limit device has a simple structure, is easy to install and maintain, has a low production cost and a long service life.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: an electrically controlled automatic limit device for lifting a wide-body dump truck for a mine, comprising a trigger plate, a first travel switch, a second travel switch and an on-board computer installed on the lifting cylinder; the on-board computer determines whether the cargo compartment is lowered into place based on the cooperation between the trigger plate and the first travel switch, and the on-board computer determines whether the cargo compartment is lifted into place based on the cooperation between the trigger plate and the second travel switch. The principle of the utility model is as follows: when the cargo compartment is lifted, the trigger piece will rotate together with the lifting cylinder. After rotating to a certain angle, it will exceed the trigger range of the first stroke switch. At this time, the on-board computer will determine that the cargo compartment is in a lifted state, and the on-board computer will limit the vehicle's driving speed; when the cargo compartment is lifted into place, the trigger piece will trigger the second stroke switch, and the on-board computer will determine that the cargo compartment is lifted into place, and then cut off the power to the two-position three-way pneumatic solenoid valve that controls the lifting, and stop the cargo compartment from continuing to lift; when the cargo compartment is completely lowered on the frame, the trigger piece will trigger the first stroke switch, and then transmit the electrical signal to the on-board computer to determine that the cargo compartment is in a lowered state. The computer will cut off the power to the two-position three-way pneumatic solenoid valve that controls the descent, and release the limit on the vehicle's driving speed.

[0006] As an improvement, the trigger piece is L-shaped, comprising a trigger portion and a mounting portion, and the mounting portion is provided with a first elongated hole.

[0007] As an improvement, the first travel switch is fixed to the vehicle frame via a first bracket, the second travel switch is fixed to the vehicle frame via a second bracket, and the trigger piece is arranged between the first travel switch and the second travel switch.

[0008] As an improvement, a second elongated hole is provided on the first bracket, and a third elongated hole is provided on the second bracket.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. The limit device has a simple structure, easy installation and maintenance, and low production cost;

[0011] 2. The installation position of the limit device is protected in all directions, such as up and down, front and back, left and right, which can effectively prevent stones from hitting, rain, mud and sticking, and effectively extend the service life of the limit switch;

[0012] 3. The installation of the limit device can effectively ensure the safety of the lifting process and prevent the risk of vehicle overturning due to overlifting and excessive speed in the lifting state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a cross-sectional view of the frame.

[0014] Figure 2 for Figure 1 Enlarged view of point A. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] like Figure 1 、 2 As shown, an electrically controlled automatic limiter device for lifting a wide-body dump truck for mining includes a trigger plate 6 mounted on a lifting cylinder 2, a first travel switch 4, a second travel switch 5, and an onboard computer. The onboard computer determines whether the cargo compartment has been lowered into position based on the interaction between the trigger plate 6 and the first travel switch 4, and determines whether the cargo compartment has been raised into position based on the interaction between the trigger plate 6 and the second travel switch 5. The upper end of the lifting cylinder 2 is hinged to the cargo compartment 3, and the lower end of the lifting cylinder 2 is hinged to the vehicle frame 1. The lifting cylinder 2 rotates during its extension and retraction process, which drives the trigger plate 6 to rotate. The trigger plate 6 is L-shaped and includes a trigger portion and a mounting portion. The mounting portion is provided with a first elongated hole, through which the position of the trigger plate 6 can be adjusted. The first travel switch 4 is fixed to the vehicle frame 1 through a first bracket 7, the second travel switch 5 is fixed to the vehicle frame 1 through a second bracket 8, and the trigger plate 6 is arranged between the first travel switch 4 and the second travel switch 5; a second elongated hole is provided on the first bracket, and a third elongated hole is provided on the second bracket. The position of the travel switch is adjusted through the elongated holes so that it can cooperate well with the trigger plate 6.

[0017] Principle of the present utility model: when the cargo compartment 3 is lifted up, the trigger piece 6 will rotate with the lifting cylinder 2. After rotating to a certain angle, it will exceed the trigger range of the first stroke switch 4. At this time, the on-board computer will determine that the cargo compartment 3 is in a lifted state, and the on-board computer will limit the vehicle's driving speed; when the cargo compartment 3 is lifted into place, the trigger piece 6 will trigger the second stroke switch 5. The on-board computer will determine that the cargo compartment 3 is lifted into place, and then cut off the power to the two-position three-way pneumatic solenoid valve that controls the lifting, and stop the cargo compartment 3 from continuing to lift; when the cargo compartment 3 is completely landed on the frame 1, the trigger piece 6 will trigger the first stroke switch 4, and then transmit the electrical signal to the on-board computer to determine that the cargo compartment 3 is in a lowered state. The computer will cut off the power to the two-position three-way pneumatic solenoid valve that controls the descent, and lift the limit on the vehicle's driving speed.

Claims

1. An electric-controlled automatic limit device for lifting a wide-body dump truck for a mine, characterized by: It includes a trigger plate installed on the lifting cylinder, a first travel switch, a second travel switch and an on-board computer; the on-board computer determines whether the cargo compartment is lowered into place based on the cooperation between the trigger plate and the first travel switch, and determines whether the cargo compartment is raised into place based on the cooperation between the trigger plate and the second travel switch.

2. The electric-controlled automatic limit device for lifting a wide-body dump truck for a mine according to claim 1, characterized in that: The trigger piece is L-shaped and includes a trigger portion and a mounting portion. The mounting portion is provided with a first elongated hole.

3. The electric-controlled automatic limit device for lifting a wide-body dump truck for a mine according to claim 1, characterized in that: The first travel switch is fixed on the vehicle frame through a first bracket, the second travel switch is fixed on the vehicle frame through a second bracket, and the trigger piece is arranged between the first travel switch and the second travel switch.

4. The electric-controlled automatic limit device for lifting a wide-body dump truck for a mine according to claim 3, characterized in that: The first bracket is provided with a second elongated hole, and the second bracket is provided with a third elongated hole.

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