KR102332590B1 - Tail gate opening and shutting device for dump truck - Google Patents

Abstract

A tailgate opening and closing apparatus for discharging a load of a cargo box provided in a dump truck according to one embodiment of the present invention comprises: a cylinder member which has one side coupled with a driving member that moves forward and backward in accordance with lifting and lowering of the cargo box while maintaining a predetermined distance from the driving member, and moves the driving member forward and backward as being moved forward and backward by pressing force applied from the outside; and a fixing member which connects the driving member with the cylinder member. A tailgate opening and closing apparatus allows sufficient opening and closing by applying pressure on the tailgate by using a driving rod of a bar shape or a pressing member of a cylinder shape.

Description

TAIL GATE OPENING AND SHUTTING DEVICE FOR DUMP TRUCK}

At least some embodiments herein relate to a tailgate switchgear for a dump truck that applies pressure to the tailgate at the same time as unlocking the tailgate to induce the tailgate to open.

In general, a dump truck is configured such that a loading box for accommodating soil or aggregate is tilted backward by a hydraulic device so that the loaded soil or aggregate can be discharged through a tailgate of the loading box.

In addition, the tailgate of the loading box is configured to automatically open the loading box when the loading box is tilted to the rear, and to automatically close the loading box when the loading box is returned to its original state (seated on the chassis frame).

That is, both upper portions of the tailgate are rotatably installed at the rear of the loading box through hinges, and the tailgate configured to automatically open and close in this way has a problem of rattling during driving or opening when driving on a slope. In addition, there is a problem in that the opening angle of the tailgate is not sufficient when discharging because viscous mud, mud, or huge garden stones are accommodated in the loading box.

In order to solve the above problems, "Korea Utility Model Publication No. 20-0261183", "Korea Patent Publication No. 10-2012199", "Korea Utility Model Publication No. 20-0152264" and "Korea Patent Publication No." Publication No. 10-2009-0116296” discloses devices that lock the tailgate so that the tailgate does not open while driving a dump truck, and unlock the tailgate when the loading box is tilted to unload the load, allowing the load to be unloaded. has been

However, the conventional tailgate has a problem in that it does not open sufficiently even when the lock is released to unload the load.

And due to this problem, as the load is concentrated at the rear of the loading box, another problem is occurring that the dump truck overturns and leads to a major accident.

According to an embodiment of the present specification, pressure is applied to the tailgate by mounting a pressure member in the form of a cylinder between a bar-shaped actuating rod provided at the bottom of the loading box or a loading box and the side of the tailgate at the same time as unlocking the tailgate. An object of the present invention is to provide a tailgate opening/closing device for a dump truck to enable sufficient opening/closing.

In the tailgate opening/closing device for discharging loads of a loading box provided in a dump truck according to an embodiment of the present specification, one side is coupled to an operation member that moves forward and backward according to the elevating and lowering of the loading box However, it may include a cylinder member for moving the operating member forward and backward by moving forward and backward by a pressing force provided from the outside, and a fixing member for connecting the operating member and the cylinder member.

In one embodiment, the pressing force supplied from the outside may be hydraulic or pneumatic.

In one embodiment, the cylinder member includes a cylinder body provided in a direction parallel to the operation member and a cylinder rod having one end coupled to one side of the fixing member and the other end being built into the cylinder body, and a pressing force provided from the outside Accordingly, as the length of the cylinder rod is varied, the operation member connected through the fixing member may be moved forward and backward.

In one embodiment, the fixing member has a concave shape on both sides, and as the concave one side is screwed with the cylinder rod of the cylinder member and the concave other side is screwed with the operating member, the operating member and the cylinder member can be connected

In one embodiment, a hydraulic pressure supply device for supplying hydraulic pressure provided to the cylinder member or a pneumatic supply device for supplying pneumatic pressure and a connection of the hydraulic pressure or pneumatic pressure to the cylinder member from the fluid supply device or the pneumatic supply device And it may further include a control valve for performing shut off.

In one embodiment, the main valve for selectively controlling the operation of the control valve and the main valve and wireless communication connected to the supply, recovery, and temporarily stop the operation of one of the hydraulic or pneumatic to the cylinder member wirelessly It may further include a wireless terminal for controlling.

In the tailgate opening and closing device for discharging the load of the loading box provided in the dump truck according to another embodiment of the present specification, a cylinder body is installed on the side of the loading box to connect the side of the loading box and the tailgate, the tail A cylinder rod is coupled to the side of the gate, and a cylinder member that opens and closes the tail gate by moving forward and backward by pressing force provided from the outside, and a side surface of the tail gate having an area larger than the size of the tip of the cylinder rod and a fastening member to be used, wherein one end of the cylinder rod is coupled to the fastening member and the other end may be built into the cylinder body.

In another embodiment, the pressing force supplied from the outside may be hydraulic or pneumatic.

In another embodiment, the cylinder member may allow the tailgate to open and close as the length of the cylinder rod is changed by a pressing force provided from the outside.

In another embodiment, a hydraulic pressure supply device for supplying hydraulic pressure provided to the cylinder member or a pneumatic supply device for supplying pneumatic pressure and a connection of the hydraulic pressure or pneumatic pressure to the cylinder member from the fluid supply device or the pneumatic supply device And it may further include a control valve for performing shut off.

In another embodiment, the main valve for selectively controlling the operation of the control valve and the main valve and wireless communication are connected to the operation related to one of the supply, recovery and temporary stop of hydraulic or pneumatic pressure to the cylinder member wirelessly It may further include a wireless terminal for controlling.

According to the present specification, a pressure member in the form of a cylinder is mounted between an operating rod in the form of a bar provided at the bottom of the loading box or the side of the loading box and the tail gate at the same time as the tail gate is unlocked to apply sufficient pressure to the tail gate. It can be opened and closed.

1 to 3 are views illustrating a dump truck in which a tailgate opening/closing device for a dump truck according to an embodiment of the present invention is installed.
4 is a perspective view illustrating a tailgate opening and closing device for a dump truck according to an embodiment of the present invention.
FIG. 5 is an enlarged plan view of the tailgate opening and closing device for the dump truck of FIG. 4 .
6A and 6B are plan views illustrating an operating state of the tailgate opening/closing device for a dump truck according to an embodiment of the present invention.
7 to 9 are views illustrating a dump truck in which a tailgate opening/closing device for a dump truck according to another embodiment of the present invention is installed.
10 is a view for explaining a supply device and a valve for providing and recovering the pressing force to the cylinder member in the embodiments of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are views showing the appearance of a dump truck in which a tailgate opening and closing device for a dump truck according to an embodiment of the present invention is installed, and FIG. 4 is a tailgate opening and closing for a dump truck according to an embodiment of the present invention. It is a perspective view illustrating the device, and FIG. 5 is an enlarged plan view of the tailgate opening and closing device for the dump truck of FIG. 4 .

1 is a view showing a dump truck in a state in which the load is accommodated in the loading box 10, FIG. 2 is a view showing the dump truck in a state in which the loading box 10 is lifted to discharge the load, and FIG. 3 is the loading box 10 ) is a view showing a dump truck in which the rear is shown.

For reference, briefly describing the basic structure of the dump truck disclosed in the present invention, the base frame 30 installed to be seated in the cargo compartment of the dump truck, hinged to the rear of the base frame 30, and lifting and lowering operations It may be configured to include a tailgate 20 that is hinged to the upper rear of the loading box 10 and loading box 10 to open and close the outlet of the loading box 10 .

The tailgate 20 opening and closing device for a dump truck according to an embodiment of the present invention is provided as a pair, and specifically installed to face both sides of the lower surface of the up-body follower 12 forming the bottom of the loading box 10 . can be

The tailgate 20 opening and closing device for the dump truck installed in this way locks the tailgate 20 so that it is not opened when driving after loading or loading the load in the loading box 10, as shown in FIG. As shown, the lock can be released so that the tailgate 20 is opened when the load is discharged.

At this time, when the tailgate 20 opening and closing device for a dump truck according to an embodiment of the present invention is unlocked to open the tailgate 20, pressure is applied to the tailgate 20 at the same time to enable sufficient opening and closing. is a technical feature.

Hereinafter, for convenience of description, one configuration among two configurations forming a pair will be described as a reference.

1 to 3 , the tailgate 20 opening/closing device for a dump truck according to an embodiment of the present invention may include a cylinder member 120 and a fixing member 130 .

The cylinder member 120 may be coupled to one side while maintaining a predetermined distance from the operation member 110 provided in the lower portion of the loading box 10 .

The operation member 110 is a bar-shaped member that has a predetermined length on the lower surface of the up-body follower 12 and is formed to extend, and at one end is the lower part of the up-body follower 12 on the rear side of the loading box 10 . It is connected to the hook 112 provided for locking or unlocking the tailgate 20 on the surface, and the other end is rotatable in the vertical direction on the lower surface of the up-body follower 12 on the front side of the loading box 10 It may be connected to the provided operating plate 114 . Specifically, one end of the operation member 110 may be connected to the hook 112 via the first hinge pin H2, and the other end of the operation member 110 is the operation plate via the second hinge pin H1. (114) can be connected.

The hook 112 may optionally lock or unlock the tailgate 20 while being spanned or separated from the hooking piece 24 formed under the tailgate 20 .

In one embodiment, the hook 112 may be rotatably connected to the lower surface of the up-body follower 12 adjacent to the engaging piece 24 via the first rotation shaft (S2).

In one embodiment, a first locking protrusion that spans or is separated from the locking piece 24 may be formed on one side of the hook 112 .

With this structure, when the loading box 10 is lifted, the first locking jaw 113 of the hook 112 is rotated about the first rotational shaft S2 by the operation of the operation member 110 to the locking piece Upon departure from (24), the tailgate (20) is unlocked. Conversely, when the loading box 10 is lowered, the first locking jaw 113 of the hook 112 is rotated about the first rotational shaft S2 by the operation of the operation member 110 to the locking piece 24 . When over, the tailgate 20 is locked.

For reference, the locking piece 24 corresponds to a member coupled in a direction perpendicular to the locking block 25 in the vertical direction, as shown in FIG. 3 .

The operation plate 114 is formed in a vertical plate shape, and may be provided on the other side of the operation member 110 to face the hook 112 .

In one embodiment, on the lower surface of the up-body follower 12 on the front side of the loading box 10, the pivot bracket 16 may be formed so as not to interfere with the base frame 30, and the operation plate 114 is the second It may be rotatably installed in the vertical direction on the rotation bracket 16 via the rotation shaft (S1).

In one embodiment, a second locking protrusion 115 may be formed on one side of the operation plate 114 , which spans the pedestal 32 formed on the side surface of the base frame 30 or is separated from the pedestal 32 .

By this structure, when the loading box 10 is lifted, the operation plate 114 rises along the loading box 10 , and at this time, the second stopping protrusion 115 of the loading plate is on the second rotation shaft S1. It is separated from the pedestal 32 while being rotated from one side of the pedestal 32 to the upper side of the pedestal 32 by the pedestal 32 . Conversely, when the loading box 10 is lowered, the operation plate 114 descends along the loading box 10, in which case the second locking protrusion 115 of the operation plate 114 is pressed to the upper side of the pedestal 32. It is rotated to one side of the pedestal 32 by two rotation shafts S1 and spans one side of the pedestal 32 .

The operation member 110 to which the above-described hook 112 and the operation plate 114 are connected at both ends, respectively, may be provided with a coil spring 116 whose length is restored or extended according to the elevation of the loading box 10 . . Specifically, one end of the coil spring 116 may be connected to the other side of the hook 112 , and the other end of the coil spring 116 may be connected to one side of the operation member 110 .

Referring to FIG. 4 , the cylinder member 120 is coupled to the operating member 110 having the above-described structure to move the operating member 110 forward and backward according to the elevating and lowering of the loading box 10 , and to move the tailgate 20 . can be opened and closed.

In an embodiment, the cylinder member 120 includes the cylinder body 122 and the operating member 110 via the cylinder body 122 provided in the direction parallel to the operation member 110 and the fixing member 130 to be described later. It may include a cylinder rod 124 for connecting. At this time, one end of the cylinder rod 124 is coupled to one side of the fixing member 130 , and the other end is embedded in the cylinder body 122 , thereby connecting the cylinder body 122 and the operation member 110 .

In an embodiment, the cylinder member 120 is provided in a direction parallel to the operation member 110 , and in detail, may be installed on the lower surface of the up-body follower 12 . In this case, the cylinder member 120 may be provided at a position facing the inside of the vehicle with respect to the operation member 110 .

The fixing member 130 is a member for connecting the operation member 110 and the cylinder member 120 and may have a concave shape on both sides.

In one embodiment, the fixing member 130 has one concave side screwed with the cylinder rod 124 of the cylinder member 120 , and the other side recessed with the operating member 110 is screwed into the operating member 110 . And the cylinder member 120 may be connected. In this embodiment, although the screw coupling is applied between the operation member 110, the cylinder member 120, and the fixing member 130, it is not limited thereto, and various coupling types such as a pin coupling, a fitting coupling, etc. can be applied.

The cylinder member 120 may move forward and backward by moving forward and backward by a pressing force provided from the outside. That is, the cylinder member 120 may move the operating member 110 connected through the fixing member 130 forward and backward as the length of the cylinder rod 124 is changed by a pressing force provided from the outside. For reference, the pressing force supplied from the outside may be hydraulic or pneumatic.

Hereinafter, with reference to FIGS. 6A and 6B , an operation process of the tailgate 20 opening/closing device for a dump truck using the cylinder member 120 will be described.

6A and 6B are plan views illustrating an operating state of the tailgate opening/closing device for a dump truck according to an embodiment of the present invention.

Referring to Figure 6a, when lifting the loading box 10 to discharge the load, the pressing force is supplied to the cylinder body 122, the cylinder rod 124 by the supplied pressing force is the rear of the loading box 10, that is, the hook 112 may extend toward one end of the operating member 110 provided with.

Accordingly, the operating member 110 coupled through the cylinder rod 124 and the fixing member 130 receives the pressing force applied to the rear of the loading box 10 from the cylinder rod 124, so that the force is generated to one end. can As a result, the hook 112 receives the pressing force from the operation member 110 , so that the first locking protrusion 113 is separated from the locking piece 24 and the tailgate 20 is opened at the same time.

Referring to Figure 6b, when the lifted loading box 10 is lowered again, the pressing force supplied to the cylinder body 122 is recovered, and the cylinder rod 124 is loaded by the recovered force in front of the loading box 10, that is, the operation plate. (114) may be reduced toward the other end of the operating member 110 is provided.

Accordingly, the operating member 110 coupled through the cylinder rod 124 and the fixing member 130 receives the pressing force applied to the front of the loading box 10 from the cylinder rod 124, so that the force is generated to the other end. can For this reason, the hook 112 is rotated about the first rotational shaft S2 so as to span the locking piece 24 and at the same time the tailgate 20 is locked.

7 to 9 are views illustrating a dump truck in which a tailgate opening/closing device for a dump truck according to another embodiment of the present invention is installed.

The tailgate 20 opening/closing device for a dump truck according to another embodiment of the present invention is provided as a pair, and specifically, may be respectively installed on the side of the loading box 10 and the tailgate 20 .

The tailgate 20 opening and closing device for the dump truck installed in this way locks the tailgate 20 so that it is not opened when driving after loading or loading the load in the loading box 10, as shown in FIG. As shown, the lock can be released so that the tailgate 20 is opened when the load is discharged.

At this time, when the tailgate 20 opening and closing device for a dump truck according to another embodiment of the present invention is unlocked to open the tailgate 20, pressure is applied to the tailgate 20 at the same time to enable sufficient opening and closing. is a technical feature.

Hereinafter, for convenience of description, one configuration among two configurations forming a pair will be described as a reference.

7 to 9 , the tailgate 20 opening/closing device for a dump truck according to an embodiment of the present invention may include a cylinder member 120 .

The cylinder member 120 includes a cylinder body 122 installed on the side of the loading box 10 and a cylinder rod coupled to the side of the tailgate 20 so as to connect the side surfaces of the loading box 10 and the tail gate 20 ( 124) may be included. At this time, one end of the cylinder rod 124 is coupled to the tailgate 20 and the other end is embedded in the cylinder body 122 , thereby connecting the loading box 10 in which the cylinder body 122 is installed and the side of the tailgate 20 . can do it

The cylinder member 120 moves forward and backward by a pressing force provided from the outside, thereby allowing the tailgate 20 to open and close. That is, the cylinder member 120 may allow the tailgate 20 to open and close as the length of the cylinder rod 124 is changed by a pressing force provided from the outside. For reference, the pressing force supplied from the outside may be hydraulic or pneumatic.

In one embodiment, a fastening member 22 having an area larger than the size of the tip of the cylinder rod 124 may be provided on the side of the tailgate. That is, one end of the cylinder rod 124 may be coupled to the fastening member 22 of the tail gate 20 , and the other end may be embedded in the cylinder body 122 .

Hereinafter, an operation process of the tailgate 20 opening and closing device for a dump truck using the cylinder member 120 will be described with reference to FIGS. 7 and 8 .

Referring to FIG. 8 , when the loading box 10 is lifted to discharge the load, a pressing force is supplied to the cylinder body 122 , and the cylinder rod 124 is extended toward the tailgate 20 by the supplied pressing force. can be

Accordingly, the tailgate 20 is opened by receiving the pressing force applied to the rear of the loading box 10 from the cylinder rod 124 .

7, when the lifted loading box 10 is lowered again, the pressing force supplied to the cylinder body 122 is recovered, and the cylinder rod 124 is reduced toward the front of the loading box 10 by the recovered force. have. In other words, the cylinder rod 124 is drawn into the cylinder body 122 .

Accordingly, the tailgate 20 is closed while closing the outlet of the loading box (10).

For reference, in the present embodiment, the tailgate 20 may be opened and closed around the rotation axis of the loading box 10 and the coupling member 26 hinged to the upper portion of the tailgate 20 .

10 is a view for explaining a supply device and a valve for providing and recovering the pressing force to the cylinder member in the embodiments of the present invention.

According to the embodiments of the present invention, a pressing force supplied to or recovered from the cylinder member 120 is used for the opening and closing operation of the tailgate 20 . It may further include a fluid supply device 140 and various valves for the purpose.

Referring to FIG. 10 , according to embodiments of the present invention, the fluid supply unit 140 for supplying hydraulic pressure or pneumatic pressure and the fluid connection and blocking are performed from the fluid supply unit 140 to the cylinder member 120 . It may include a control valve that does.

In one embodiment, the fluid supply device 140 may include a hydraulic pressure supply device 142a for supplying hydraulic pressure or a pneumatic supply device 142b for supplying air pressure.

In one embodiment, the hydraulic supply device 142a or the pneumatic supply device 142b may be a supply pump provided according to a preset specification when manufacturing a dump truck, and is an independent supply device manufactured externally separately from manufacturing a dump truck. and can be mounted on a truck.

In one embodiment, the control valve may be provided for each cylinder member 120 composed of a pair, and a connection valve 150a for supplying hydraulic or pneumatic pressure and a shut-off valve 150b for recovery for each cylinder member 120 . ) may be independently provided. Accordingly, the supply and recovery of the fluid can be operated by selectively controlling the connection valve 150a or the shutoff valve 150b.

On the other hand, it may further include a main valve for selectively controlling the operation of the control valve and a wireless terminal 170 for performing wireless communication with the main valve.

The main valve is a controller that integrally controls each control valve, and may be implemented as an electronic solenoid valve.

In one embodiment, the main valve may include a first main valve 160a for controlling the operation of the connection valve 150a and a second main valve 160b for controlling the operation of the shut-off valve 150b.

The wireless terminal 170 is connected to the main valve by wireless communication to wirelessly control an operation related to one of supply, recovery, and temporary stop of hydraulic or pneumatic pressure to the cylinder member 120 .

Accordingly, the user of the dump truck can open and close the tailgate 20 by controlling the operation of the main valve only by a simple manipulation of a button or touch of the terminal from the outside.

Accordingly, according to the present specification, a cylinder between the side of the loading box 10 and the tailgate 20 or a bar-shaped actuating rod provided in the lower portion of the loading box 10 at the same time as unlocking the tailgate 20 . A pressure member in the form of a pressure member may be mounted to apply pressure to the tailgate 20 to enable sufficient opening and closing.

The embodiments disclosed herein have been described above with reference to the accompanying drawings. As such, the embodiments shown in the drawings should not be construed as being limited, and may be combined with each other by those skilled in the art having read the contents of the present specification, and when combined, it may be interpreted that some components may be omitted.

Here, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical idea disclosed in the present specification.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only one embodiment disclosed in the present specification, and do not represent all the technical ideas disclosed in the present specification. It should be understood that there may be equivalents and variations.

10 : loading box
12 : Upbody Follower
16: rotation bracket
20 : tailgate
22: fastening member
24: jammed piece
25: jam block
26: coupling member
30: base frame
32: pedestal
110: operation member
112: hook
113: first locking jaw
114: actuation plate
115: second locking jaw
116: coil spring
120: cylinder member
122: cylinder body
124: cylinder rod
130: fixing member
140: fluid supply device
142a: hydraulic supply
142b: pneumatic supply
150a: connection valve
150b: shut-off valve
160a: first main valve
160b: second main valve
170: wireless terminal
H1: second hinge pin
H2: first hinge pin
S1: second rotation axis
S2: 1st rotation axis

Claims (11)

In the tailgate opening and closing device for discharging the load of the loading box provided in the dump truck,
A cylinder member with one side coupled while maintaining a predetermined distance with the operation member moving forward and backward according to the elevating and lowering of the loading box, and moving the operation member forward and backward by moving forward and backward by a pressing force provided from the outside; and
A fixing member for connecting the operation member and the cylinder member
including,
One end of the operation member is connected to a hook having a locking protrusion formed on one side so as to span over or separate from the locking piece formed under the tailgate,
The cylinder member
A cylinder body provided in a direction parallel to the operation member and a cylinder rod having one end coupled with one side of the fixing member and the other end being built into the cylinder body, the length of the cylinder rod is variable by a pressing force provided from the outside moving the operating member connected through the fixing member forward and backward as
The fixing member has a concave shape on both sides, and one concave side is screwed with the cylinder rod of the cylinder member, and the other side of the fixing member is screwed with the operating member to connect the operating member and the cylinder member,
When the pressing force is supplied to the cylinder member when the loading box is raised, the cylinder rod extends toward one end of the operating member and the operating member receives the pressing force applied to the rear of the loading box from the cylinder rod, the hook The tailgate is opened as the locking jaw of the locking piece is separated from the locking piece,
When the pressing force supplied to the cylinder member is recovered when the loading box is lowered, the cylinder rod is reduced toward the other end of the operating member and the operating member receives the pressing force applied to the front of the loading box from the cylinder rod. The tailgate opening/closing device for a dump truck, characterized in that the tailgate is locked as the hooking protrusion of the hook is spanned over the hooking piece.
According to claim 1,
The tailgate opening and closing device for a dump truck, characterized in that the pressing force supplied from the outside is hydraulic or pneumatic.
delete delete 3. The method of claim 2,
a hydraulic pressure supply device for supplying hydraulic pressure provided to the cylinder member or a pneumatic supply device for supplying air pressure; and
A control valve for connecting and disconnecting the hydraulic pressure or pneumatic pressure from the hydraulic supply device or the pneumatic supply device to the cylinder member
Tailgate opening and closing device for a dump truck, characterized in that it further comprises.
6. The method of claim 5,
a main valve selectively controlling the operation of the control valve; and
A wireless terminal connected to the main valve by wireless communication to wirelessly control an operation related to one of supply, recovery, and temporary stop of hydraulic or pneumatic pressure to the cylinder member
Tailgate opening and closing device for a dump truck, characterized in that it further comprises.
delete delete delete delete delete

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