KR20140013634A

KR20140013634A - Overturn prevention device for dump truck

Info

Publication number: KR20140013634A
Application number: KR1020120081514A
Authority: KR
Inventors: 백인철
Original assignee: 현대자동차주식회사
Priority date: 2012-07-26
Filing date: 2012-07-26
Publication date: 2014-02-05

Abstract

The present invention relates to an overturn prevention device for dump truck. The purpose of the present invention is to provide an overturn prevention device for dump truck capable of preventing the overturn of a vehicle by automatically moving the center of gravity of a cargo box while determining the risk of the overturn of the vehicle during a dumping work in a transverse slope and warning a driver about the risk, and performing a dumping work even in a certain slope. To achieve the above purpose, the overturn prevention device for dump truck of the present invention has a cylinder device, which vertically rotates the cargo box around a hinge coupling portion with the cargo box rotatably coupled to a vehicle frame by means of the hinge coupling portion and in particular, comprises: a load detection means for detecting a load applied to the left part and right part of the vehicle frame through the hinge coupling portion from the cargo box during a dumping operation performed by the cylinder device; a control unit for outputting a control signal for preventing the overturn of the vehicle when it is determined that a signal detected by the load detection means indicates the risk of overturn of the vehicle; and a driving means for moving, for the cargo box, the coupling portion of the cylinder device coupled to the cargo box left or right according to the control signal output from the control unit to move the entire center of gravity of the dump truck.

Description

Overturn prevention device for dump truck

The present invention relates to an anti-overturning apparatus for a dump truck, and more particularly, to determine the risk of vehicle overturning during a dumping operation in a transverse slope and to warn the driver and to prevent the vehicle overturning to some extent. It also relates to a tipper overturn prevention device that allows dumping to be carried out at.

In general, dump trucks are widely used to load and transport construction materials such as soil and gravel at construction and civil engineering sites.

These dump trucks are equipped with a loading box that can load a large amount of loads, such as construction and civil engineering materials, and is to lift and rotate the load during the dumping operation to get off the load.

To this end, the stacker of the dump truck is mounted in a structure in which the hinge coupling portion of the rear lower side is hinged to the vehicle body frame and the front end thereof is connected to the vehicle body frame via a cylinder mechanism.

In addition, the rear end of the loading box is provided with a gate for discharging the load.

1 is a perspective view illustrating a conventional dump truck, and FIG. 2 is a view illustrating a connection structure of a cylinder mechanism between a dump box of a dump truck and a vehicle body frame.

During the load unloading operation of the dump truck 10, that is, the dumping operation, the piston rod 14a of the cylinder mechanism 14 is moved upward to raise the front end of the loading box 12 and load it thereon. The whole is rotated about a hinge coupling part (not shown) with the body frame 11 so that the load can be discharged through the gate 12a at the rear end of the loading box 12.

On the other hand, when the dump truck is dumped to get off the various loads loaded in the loading box, the center of gravity of the entire truck goes up as the loading box rises in the body frame.

In this case, it does not matter if there is no lateral inclination of the ground on which the dump truck stops, but when the left and right lateral inclination of the ground is large due to the upward movement of the center of gravity, an accident may occur in which the vehicle is rolled over to the left and right.

This is indicated in the user manual or the driver's seat so as not to dump during lateral inclination, but in reality, the driver is not obeying these instructions.

Therefore, as a prior document for preventing overturning of a dump truck, Korean Patent No. 10-397937 is provided with a transverse tilt detection sensor (a kind of tilt sensor) for detecting whether the transverse tilt of the vehicle is made during dumping, and the transverse tilt detection sensor is provided. When a transverse gradient of more than a predetermined angle is detected, an overturn prevention device for automatically stopping the dumping operation by stopping power supply and alerting a driver at the same time is disclosed.

However, this rollover protection technology does not actively prevent the tipping truck's rollover accident itself because it merely alerts the transverse slope and stops the dumping operation, and it stops the operation even when a slight transverse slope occurs. There is a problem of excessively restricting the working conditions of the truck.

In particular, when the work interruption as described above to move to the flat to get off the load, the hassle to move the vehicle to the flat, the load on the flat has to move back to the site of the slope.

Therefore, it is necessary to develop a more active anti-overturning technology that enables dumping work while preventing tipper trucks from rolling over even on a slope where a slight inclination of the vehicle body occurs.

Therefore, the present invention was created to solve the above problems, the vehicle overturning by automatically shifting the center of gravity of the loading box while warning the driver after determining the risk of overturning the vehicle during the dumping operation on the transverse slope It is an object of the present invention to provide a tipper overturn prevention device for preventing dumping and enabling the dumping operation to be performed on a certain slope.

In order to achieve the above object, the present invention provides a dump truck having a cylinder mechanism that is rotatably coupled to the vehicle body frame via a hinge coupling portion and rotates the loading compartment in an up and down direction about the hinge coupling portion. An anti-overturning apparatus, comprising: load detecting means for detecting a load applied to a left portion and a right portion of a vehicle body frame through a hinge coupling portion from a loading box during a dumping operation by a cylinder mechanism; A controller for outputting a control signal for preventing vehicle overturning when it is determined that there is a risk of vehicle overturning based on the detection signal of the load detecting means; A driving means for moving the center of gravity of the entire dump truck by moving the coupling portion of the cylinder mechanism, which is a coupling portion with the loading box side, to the left or right side according to the control signal output from the controller; To provide.

In a preferred embodiment, the load detecting means is characterized in that the pressure sensor is installed between the left and right bearing parts and the vehicle body frame to rotatably support both ends of the hinge shaft of the loading box in the hinge coupling portion.

The driving means may include: a ball screw shaft installed to be rotatably supported by a bracket on the loading box and to be disposed in a left and right direction of the loading box; And a driving motor which is fixed to the loading box and driven according to a control signal of the controller and rotates the ball screw shaft during driving. The coupling part of the cylinder mechanism is screwed to the ball screw shaft.

The control unit may determine that there is a risk of overturning to the left or right side when the difference between the loads applied to the left side and the right side is greater than or equal to a threshold.

The control unit may move the coupling unit of the cylinder mechanism in a direction opposite to the rollover prediction direction.

In addition, the engaging portion of the cylinder mechanism is characterized in that the front end of the piston rod which is moved back and forth in the up and down direction from the cylinder body coupled to the vehicle body frame.

Accordingly, the rollover prevention apparatus of the present invention effectively prevents the vehicle overturning by automatically moving the load center and the center of gravity of the vehicle through the actuator when it is determined that there is a risk of vehicle overturning through the sensor during the dumping operation.

In particular, during the damping operation, a control is performed to detect a large inclination of the storage box to one side and to automatically move the center of gravity in the opposite direction, and to quickly control the attitude of the storage box so that the vehicle overturning can be prevented through the active control of the center of gravity. It allows dumping work on some slopes while preventing the vehicle from tipping over.

As a result, it is possible to eliminate the inconvenience due to the flat unloading and transporting the slope of the load, it is possible to secure the convenience and safety while enabling the unloading of the load at the desired position.

1 is a perspective view showing a conventional dump truck.
2 is a view showing a connection structure of a cylinder mechanism between a loading box and a vehicle body frame in a conventional dump truck.
Figure 3 is a perspective view for explaining the position where the pressure sensor is installed in the rollover prevention apparatus according to the present invention.
Figure 4 is a schematic diagram showing the installation state of the pressure sensor in the rollover protection device according to the present invention.
5 is a view showing a connection structure of the cylinder mechanism connecting the storage box and the vehicle body frame in the present invention.
6 is a flowchart illustrating an operation and control process of the rollover prevention device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be easily understood by those skilled in the art.

Figure 3 is a perspective view for explaining the position where the pressure sensor is installed in the rollover prevention apparatus according to the present invention, Figure 4 is a schematic diagram showing the installation state of the pressure sensor.

3 and 4 show the hinge coupling portion 121 of the rear end of the loading box 120 together with the pressure sensor 125.

As shown, the hinge coupling portion 121 is a component that connects between the rear end of the loading box 120 and the vehicle body frame 110, so that the loading box 120 in the vehicle body frame 110 can be rotated in the up and down directions. It becomes a component to be combined.

The hinge coupler 121 has a hinge shaft 123 which is installed to be disposed long in the left and right direction at the rear end of the loading box 120 and the left and right sides rotatably supporting both ends of the hinge shaft 123 in the body frame 110. It is configured to include a bearing portion 122.

Here, the bearing portion 122 is installed on the vehicle body frame 110 to support the hinge shaft 123, the hinge shaft 123 is rotatably coupled to the bearing portion 122, both ends of the bracket 124 It is fixed to the loading box 120 through the).

Accordingly, when the stacking box 120 is rotated in the up and down direction during the dumping operation or after the dumping end, the stacking box can be rotated in the vehicle body frame 110 while the hinge shaft 123 is rotated at the same time as the hinge axis.

In this configuration, the rollover prevention apparatus of the present invention includes load detection means for detecting loads applied to the left and right portions of the body frame 110 through the hinge coupling portion 121 from the loading box 120 during the dumping operation. do.

The load detecting means is installed between the hinge coupling portion 121 and the vehicle body frame 110 to detect loads applied to the left and right portions of the vehicle body frame 110, respectively, and each bearing portion 122 on the left and right sides. And a pressure sensor 125 installed between the vehicle body frame 110.

Each of the pressure sensors 125 is installed between the hinge coupler 121 and the vehicle body frame 110 to detect pressure applied to the vehicle body frame 110 through the hinge shaft 123 and the bearing unit 122. An electrical signal (pressure detection signal) corresponding to the pressure detection value is output and input to the control unit 101.

Referring to FIG. 4, the pressure sensors 125 are respectively installed between the left and right bearing parts 122 and the vehicle body frame 110, and each pressure sensor 125 detects the pressure in the controller 101. It shows that the input of signal is connected.

The controller 101 compares the pressure detection signals of the left and right pressure sensors 125 and determines that there is a risk of vehicle overturning when the difference between the detected left and right pressures rises above a predetermined threshold. To output a control signal for preventing the vehicle from overturning.

On the other hand, Figure 5 is a view showing a connection structure of the cylinder mechanism connecting the storage box and the vehicle body frame in the present invention.

As described above, in the state in which the rear end of the loading box 120 is coupled to the vehicle frame 110 via the hinge coupling portion 121, the front of the loading box 120 is a cylinder for rotating the loading box 120 in the up and down directions. It is connected to the vehicle body frame 110 via the mechanism 130.

The cylinder mechanism 130 is a dumping driving means for rotating the loading box 120 in the up and down direction, and the piston rod 131 is moved back and forth in the up and down direction according to the control signal of the controller 101. The lower end of the cylinder body 130 of the cylinder mechanism 130 is rotatably hinged to the vehicle body frame 110, and the tip of the piston rod 131 of the cylinder mechanism 130 is coupled to the front end of the loading box 120.

In the cylinder mechanism 130, the lower end of the cylinder body becomes a coupling part with the vehicle body frame 110, and the tip of the piston rod 131 becomes a coupling part with the loading box 120.

At this time, the front end portion of the piston rod 131 which is a coupling portion with the loading box 120 is coupled with the loading box 120 so as to be moved in the left and right direction of the vehicle body (ie, the left and right direction of the loading box), Driving means for moving the front end portion in the left and right direction with respect to the loading box 120 is installed.

The driving means is installed between the stacker 120 and the cylinder mechanism 130 as a component for moving the center of gravity of the entire dump truck including the stacker 120 so that the vehicle overturning does not occur, the stacker 120 and the cylinder mechanism By moving the front end portion of the piston rod 131, which is a coupling portion between the 130 to the left and right direction with respect to the loading box 120 to adjust the left and right weight balance of the dump truck during dumping.

Here, adjusting the left and right weight balance of the dump truck means moving the center of gravity of the entire dump truck including the loading box so that the vehicle does not roll over.

Referring to the configuration of the drive means in more detail, a bracket 132 to which the cylinder mechanism 130 is coupled to the front of the stacking box 120 is installed, the ball screw shaft 133 is arranged long left and right on the bracket 132 ) Is rotatably supported.

In addition, the drive motor 134, which is an actuator for rotationally driving the ball screw shaft 133, is fixedly installed at the front of the loading box 120, and the driving motor 134 controls the driving according to a control signal output from the controller 101. It is provided to be.

The ball screw shaft 133 is integrally coupled to the driving shaft of the driving motor 134 so as to rotate integrally with the driving shaft when the driving motor 134 rotates.

In addition, the tip end portion of the piston rod 131 is coupled to the ball screw shaft 133, and a screw thread is formed on the inner circumferential surface of the portion (provided with a female screw structure) coupled to the ball screw shaft 133 at the tip portion of the piston rod 131. It is machined and screwed into a ball screw shaft that serves as a male screw.

That is, the front end of the piston rod 131, which is the engaging portion of the cylinder mechanism 130, is screwed to the ball screw shaft 133, so that the front end of the piston rod 131 is a ball screw when the ball screw shaft 133 is rotated. It is to be able to move along the axial direction of the axis (133).

As a result, when the ball screw shaft 133 is rotated by the drive motor 134, the tip end portion of the piston rod 131 is moved along the ball screw shaft 133, and the ball screw shaft 133 is loaded with the vehicle body 120. Since the length of the piston rod 131 is adjusted according to the rotational direction and the amount of rotation of the driving motor 134, the position of the front end portion of the piston rod 131 may be adjusted in the horizontal direction.

As such, when the front end of the piston rod 131 is moved and adjusted in the left and right directions along the ball screw shaft 133, the center of gravity of the entire vehicle including the loading 120 may be moved so that the vehicle is not rolled over when dumping. do.

6 is a flow chart illustrating an operation and control process of the rollover prevention device according to the present invention.

First, the cylinder mechanism 130 is operated in accordance with the control signal of the control unit 101 during the dumping operation (S11), while the piston rod 131 is moved forward when the cylinder mechanism 130 is operated to the loading of 120 The front end is lifted up.

At this time, the loading box 120 is rotated about the hinge coupling portion 121 of the rear end, and the load (pressure) of the left and right applied to the vehicle frame 110 through the hinge coupling portion 121 at the same time as the rotation It is detected by each pressure sensor 125 and input to the controller 101.

The control unit 101 receives the pressure detection signals of the two pressure sensors 125 while the dumping operation is performed, and compares the pressures of the left and right sides (S12). If the threshold is greater than the threshold to warn the driver by operating a warning device that there is a risk of overturning (S13, S14).

At the same time, the control unit 101 outputs a control signal for moving the center of gravity of the entire vehicle including the loading box 120 such that the pressure difference between the left and right sides is less than a threshold value, the left pressure being greater than the right pressure. If it is larger than the threshold value, it is determined that the vehicle is in danger of overturning to the left side, and a control signal for moving the distal end portion of the piston rod 131 to the right side in the reverse direction (the opposite direction to the reversal prediction direction) is output.

On the other hand, if the right side pressure is greater than the left side pressure above the threshold, it is determined that the vehicle may be overturned to the right side, and the front end portion of the piston rod 131 is moved to the left side in the opposite direction (the opposite direction to the tipping prediction direction). Outputs a control signal for movement.

As a result, the rotation direction and the rotation amount of the driving motor 134 are determined according to the control signal of the control unit 101 as described above, and the driving motor 134 is rotated in the forward or reverse direction by the control signal of the control unit 101. As the ball screw shaft 133 is rotated, the tip end portion of the piston rod 131 is moved left or right along the axial direction of the ball screw shaft 133 (S14, S15, and S16).

As such, when the tip of the piston rod is moved along the ball screw shaft, the center of gravity of the entire vehicle including the loading box 120 may be moved in a direction in which the left and right weight balance of the entire vehicle is maximized in balance when dumping. During this process, the center of gravity is moved and corrected so that the difference in the left and right pressures is always kept below the threshold value, thereby preventing the vehicle from overturning.

That is, until the dumping operation is completed, the pressure difference between the left and right sides is compared with the threshold value so that the operation of the actuator (operation of the driving motor and the ball screw shaft) and the movement of the center of gravity are continuously controlled so as not to exceed the threshold value. This will allow you to safely complete the dumping operation without rolling over.

In this way, the rollover prevention apparatus of the present invention effectively prevents the vehicle overturning by moving the center of gravity of the entire vehicle, including the automatic loading through the actuator, if it is determined that there is a risk of vehicle overturning through the sensor during the dumping operation. do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Modified forms are also included within the scope of the present invention.

101: control unit 110: body frame
120: loading box 121: hinge coupling portion
122: bearing portion 123: hinge shaft
124: bracket 125: pressure sensor
130: cylinder mechanism 131: piston rod
132: bracket 133: ball screw shaft
134: drive motor

Claims

In the dump truck rollover prevention device having a cylinder mechanism that is rotatably coupled to the vehicle body frame via a hinge coupling portion and rotates the loading box in a vertical direction about the hinge coupling portion,
Load detecting means for detecting a load applied to the left side and the right side of the vehicle body frame from the loading box through the hinge coupling portion during the dumping operation by the cylinder mechanism;
A controller for outputting a control signal for preventing vehicle overturning when it is determined that there is a risk of vehicle overturning based on the detection signal of the load detecting means;
Drive means for moving the center of gravity of the entire dump truck by moving the coupling portion of the cylinder mechanism, which is a coupling portion with the loading box side, to the left or right side according to the control signal output from the controller;
Rollover prevention device of a dump truck comprising a.

The method according to claim 1,
The load detecting means is a pressure sensor installed between the left and right bearing parts and the vehicle body frame rotatably supporting both ends of the hinge shaft of the loading box in the hinge coupling portion, the dump truck anti-overturn apparatus.

The method according to claim 1,
The driving means
A ball screw shaft which is rotatably supported by the bracket and installed to be long in the left and right direction of the loading box;
A driving motor which is fixed to the loading box and controlled to be driven according to a control signal of the controller and rotates the ball screw shaft during driving;
And a coupling portion of the cylinder mechanism is screwed to the ball screw shaft.

The method according to claim 1,
And the controller determines that there is a risk of the rollover to the left or the right when the difference between the loads applied to the left portion and the right portion is greater than or equal to a threshold value.

The method according to claim 1 or 4,
And the controller is configured to move the engaging portion of the cylinder mechanism in a direction opposite to a rollover prediction direction.

The method according to claim 1, 3, or 5,
And a coupling portion of the cylinder mechanism is a tip portion of a piston rod which is moved back and forth in a vertical direction from a cylinder body coupled to a vehicle body frame.