KR102553500B1 - Tailgate automatic opening and shutting device for dump truck - Google Patents

Abstract

The disclosed automatic opening/closing device for a tailgate for a dump truck includes a loading box with a bracket fixed to the rear top of both side walls; Rotating plates are fixedly installed on both sides of the upper end, and rotating shafts are installed on the rotating plates so as to be able to pivot in the vertical direction on the brackets. a tailgate that opens the rear of the loading box and closes the rear end of the loading box when the loading box is seated on the chassis frame; An opening/closing operation unit that allows the tailgate to be opened or closed while the cargo box is seated on the chassis frame; and an intermittent unit supporting the tailgate opened by the opening/closing operation unit.

Description

Tail gate automatic opening and closing device for dump truck {TAILGATE AUTOMATIC OPENING AND SHUTTING DEVICE FOR DUMP TRUCK}

The present invention (Disclosure) relates to an automatic opening and closing device for a tailgate for a dump truck, and more particularly, to an automatic opening and closing device for a tailgate for a dump truck that allows the tailgate to be automatically opened and closed even when a loader is seated on a chassis frame. it's about

Here, background art related to the present invention is provided, and they do not necessarily mean prior art (This section provides background information related to the present disclosure which is not necessarily prior art).

In general, a dump truck is configured such that a loading box containing soil or aggregate is tilted backward by a hydraulic device so that the loaded soil or aggregate can be unloaded through the 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 backward, 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 via a rotating shaft.

However, the conventional dump truck has a problem in that the tailgate cannot be opened and closed while the loading box is seated on the chassis frame.

Korean Utility Model Registration No. 20-0486557. Korea Utility Model Registration No. 20-0427997. Korean Utility Model Publication No. 20-1998-0034587. Korean Registered Patent Publication No. 10-2195801.

The present invention (Disclosure) is a tailgate for a dump truck that not only opens and closes the rear end of the load box in conjunction with the dumping operation, but also automatically opens and closes the tailgate even when the load box is seated on the chassis frame. One purpose is to provide an automatic opening and closing device.

An object of the present invention is to provide an automatic tailgate opening and closing device for a dump truck that can safely support an open tailgate in a state where a loader is seated on a chassis frame.

In addition, the problem to be solved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. It could be.

This section provides a general summary of the disclosure and is not a comprehensive disclosure of its full scope or all of its features).

In order to solve the above problems, an automatic opening and closing device for a tailgate for a dump truck according to one of the various aspects of the present invention includes a loading box with a bracket fixed to the rear end of both side walls; Rotating plates are fixedly installed on both sides of the upper end, and rotating shafts are installed on the rotating plates so as to be able to pivot in the vertical direction on the brackets. a tailgate that opens the rear of the loading box and closes the rear end of the loading box when the loading box is seated on the chassis frame; An opening/closing operation unit that allows the tailgate to be opened or closed while the cargo box is seated on the chassis frame; and an intermittent unit supporting the tailgate opened by the opening/closing operation unit.

In the automatic opening/closing device for a tailgate for a dump truck according to one aspect of the present invention, the opening/closing operation unit includes: a first roller fixedly installed to an exposed rotating shaft extending toward an outer surface of a sidewall; A second roller rotatably installed on a fixed shaft fixed to the lower side of the outer surface of the side wall facing the rotation shaft in the vertical direction; and a chain fixed to the lower side of the outer surface of the side wall to extend the cylinder rod toward the second roller and return the extended cylinder rod away from the second roller, and pass through the first roller and the second roller. An opening/closing cylinder connected to the tailgate via a medium; however, the tailgate can be opened when the opening/closing cylinder returns the cylinder rod, and the tailgate can be closed when the opening/closing cylinder extends the cylinder rod.

In the automatic opening and closing device for a tailgate for a dump truck according to one aspect of the present invention, first flanges are formed on both sides of the first roller to protrude along the outer circumferential surface of the first roller, and the intermittent portion is formed on the outer circumferential surface of the first flange. A groove through which the striker moves in and out may be formed to be recessed toward the center of rotation of the first flange.

In the automatic opening and closing device for a tailgate for a dump truck according to one aspect of the present invention, one end of the chain is connected to the extended end of the cylinder rod, and the other end of the chain passes through the lower part of the second roller and the upper part of the first roller. A link connected to a rotation plate installed at the top of the tailgate and connected to the other end of the chain to the rotation plate may be installed to face the first roller.

In the automatic opening/closing device for a tailgate for a dump truck according to one aspect of the present invention, the interlocking unit includes: a sliding control slider for interlocking and releasing the interlocking of the first roller in conjunction with the first roller; and an interlocking arm that interlocks the unlocking slider with the first roller.

In the automatic opening and closing device for a tailgate for a dump truck according to one aspect of the present invention, the rail unlocking slider is provided on the upper side of the outer surface of the side wall so as to move closer to or away from the first roller through sub-frames. It is slidably installed inside the rail in the form of a square tube, and a striker having a circular cross section crossing at right angles to the turning direction of the first roller is installed on one side of the sliding lock slider facing the first roller. The striker is inserted into the groove formed in the first flanges of the first roller when the tailgate is opened by the operation of the opening and closing operation unit, and can come out of the groove when the tailgate is closed by the operation of the opening and closing operation unit.

In the automatic opening/closing device for a tailgate for a dump truck according to one aspect of the present invention, interlocking arms are provided as a pair, and one end of the interlocking arms is disposed on the outer surfaces of the first flanges via first hinge pins. It is pivotally connected in the vertical direction, and the other ends of the interlocking arms are pivotally connected to both sides of the rail unlocking slider via second hinge pins, respectively, and on both sides of the rail, the second hinge pin is connected to the rail unlocking slider At the same time, a guide hole is formed to guide the second hinge pins along the length of the rail, and when the tailgate is opened by the operation of the opening and closing operation unit, one end of the interlocking arm rotates counterclockwise along the first flange. When the tailgate is closed by the operation of the opening/closing operation unit, one end of the interlocking arm rotates clockwise along the first flange while the unlocking slider moves to the side of the first roller. It can be moved away from the side of the first roller to allow the striker to come out of the groove.

According to the present invention, the rear end of the loading box can be opened and closed by interlocking the loading box with the dumping operation, and the tailgate can be automatically opened and closed even when the loading box is seated on the chassis frame, and the open tailgate can be safely supported. It will be able to provide the effect that can be done.

1 and 2 are views schematically showing a tailgate for a dump truck related to the present invention.
3 is a view schematically showing a dump truck in which an automatic opening and closing device for a dump truck according to the present invention is installed.
4 and 5 are views schematically showing an operating state of the automatic opening and closing device for a tailgate for a dump truck according to the present invention, FIG. 4 is a view schematically showing an open state of the tailgate, and FIG. 5 is a view showing the tailgate A schematic drawing of the closed state.

Hereinafter, an embodiment implementing an automatic opening and closing device for a dump truck according to the present invention will be described in detail with reference to the drawings.

However, the essential (intrinsic) technical idea of the present invention cannot be said to be limited by the embodiments described below, and based on the essential (intrinsic) technical idea of the present invention, a person skilled in the art below It is revealed that the embodiments described in include the range that can be easily proposed as a method of substitution or change.

In addition, since the terms used below are selected for convenience of description, in grasping the essential (intrinsic) technical idea of the present invention, they are not limited to the dictionary meaning and are appropriately interpreted in a meaning consistent with the technical idea of the present invention. It should be.

Among the accompanying drawings, FIGS. 1 and 2 are views schematically showing a tailgate for a dump truck related to the present invention.

Referring to FIGS. 1 and 2 , the tailgate 10 for a dump truck is installed in the loading box 20 to open or close the open rear of the loading box 20 of the dump truck, as anyone can know.

In other words, the rotation plates 12 are fixedly installed on both sides of the upper end of the tailgate 10, and the brackets 24 are fixedly installed on the upper ends of both side walls 22 of the loading box 20. Further, each rotation plate 12 is pivotally installed in the vertical direction to the adjacent bracket 24 via the rotation shaft 14 .

Here, the rotating shaft 14 is fixedly installed to the rotating plate 12, and is pivotally fitted into the bracket 24.

The tailgate 10 installed in this way opens the rear end of the loading box 20 when the loading box 20 is tilted to the rear side so that the load loaded on the loading box 20 can be unloaded (see FIG. 2), and the loading box 20 is installed on the chassis. When seated on the frame 30, it returns and closes the rear of the loading box 20 (see FIG. 1).

Meanwhile, the automatic opening/closing device 100 for a tailgate for a dump truck according to the present invention enables the tailgate 10 to be opened or closed even when the loading box 20 is seated on the chassis frame 30.

Among the accompanying drawings, FIGS. 3 to 5 are diagrams schematically showing an automatic opening and closing device for a tailgate for a dump truck according to the present invention. It is respectively installed on both side walls 22 of the.

3 to 5, the automatic opening and closing device 100 for a tailgate for a dump truck according to the present invention can open or close the tailgate 10 in a state where the loading box 20 is seated on the chassis frame 30. It includes an opening/closing operation unit 110 and an intermittent unit 130 supporting the tailgate 10 opened by the opening/closing operation unit 110.

First, the opening/closing operation unit 110 operates the opening/closing cylinder 120 connected to the tailgate 10 via the chain 124 and the first and second rollers 112 and 116 guiding the chain 124. include

The first roller 112 is fixedly installed on the rotating shaft 14 exposed to the outer surface of the side wall 22 .

Preferably, the rotational shaft 14 is formed to extend further toward the outer surface of the side wall 22, unlike conventional dump trucks, so that the first roller 112 can be fixedly installed.

At this time, on both sides of the first roller 112, a first flange 114 is formed to protrude along the outer circumferential surface of the first roller 112, and the outer circumferential surface of the first roller 112 thus formed and a pair of first flanges A chain 124 is guided between the inner surfaces of the 114's.

Further, on the outer circumferential surface of the pair of first flanges 114, a groove 115 into which a striker 136 of an intermittent portion 130 to be described later enters and exits is formed to be recessed toward the center of rotation of the first flange 114.

The second roller 116 is rotatably installed on the fixed shaft 26 fixedly installed on the lower side of the outer surface of the side wall 22 to face the rotation shaft 14 in the vertical direction.

At this time, on both sides of the second roller 116, like the first roller 112, the second flange 118 is formed to protrude along the outer circumferential surface of the second roller 116, and the second roller 116 thus formed The chain 124 is guided between the outer circumferential surface of and the inner surface of the pair of second flanges 118 .

On the other hand, the opening and closing cylinder 120 is connected to the hydraulic system (not shown) of the dump truck, and is fixedly installed on the lower side of the outer surface of the side wall 22 like the second roller 116.

The opening/closing cylinder 120 installed in this way extends the cylinder rod 122 toward the second roller 116 and returns (retracts) the extended cylinder rod 122 away from the second roller 116 side.

Also, the opening/closing cylinder 120 is connected to the tailgate 10 via a chain 124 passing through the first and second rollers 112 and 116.

One end of the chain 124 is connected to the extended end of the cylinder rod 122 of the opening and closing cylinder 120, as shown, and the other end of the chain 124 is the lower part of the second roller 116 and the first roller 112 It is connected to the rotation plate 12 installed at the top of the tailgate 10 via the top of ).

At this time, a link 126 to which the other end of the chain 124 is connected is installed on the rotating plate 12 to face the first roller 112 .

That is, when the opening/closing cylinder 120 returns (retracts) the cylinder rod 122 away from the second roller 116 side in a state where the loading box 20 is seated on the chassis frame 30, the chain 124 moves the cylinder Guided to the opening/closing cylinder 120 along the rod 122, and as the chain 124 is guided to the opening/closing cylinder 120 in this way, the chain 124 pulls the tailgate 10, whereby the rotating shaft 14 ) and the tailgate 10 turns counterclockwise on the drawing and opens (see FIG. 4).

Conversely, under the condition that the loading box 20 is seated on the chassis frame 30, the opening/closing cylinder 120 extends the cylinder rod 122 close to the second roller 116 side, and the chain 124 moves the cylinder rod 122 ), and as the chain 124 is guided to the tailgate 10 in this way, the chain 124 loses the force pulling the tailgate 10, whereby the rotation shaft ( 14) and the tailgate 10 are closed by turning clockwise in the drawing.

The interlocking unit 130 interlocks with the first roller 112 to interlock and uninterrupt the first roller 112, and an unlocking slider 132 and an unlocking slider 132 are connected to the first roller 112. and an interlocking arm 138 for interlocking.

The sliding release slider 132 is slidably installed on the upper side of the outer surface of the side wall 22 so as to come closer to or away from the first roller 112.

To this end, on the upper side of the outer surface of the side wall 22, a square tube-shaped rail 134 extending along the longitudinal direction of the loading box 20 is installed via sub-frames, and the rail 134 ) is slidably installed inside.

Also, a striker 136 having a circular cross-section crossing at right angles to the turning direction of the first roller 112 is installed on one side of the sliding lock slider 132 facing the first roller 112.

The striker 136 is inserted into the groove 115 formed in the first flanges 114 of the first roller 112 when the tailgate 10 is opened by the operation of the opening and closing operation unit 110 (see FIG. 4 ), when the tailgate 10 is closed by the operation of the opening/closing operation unit 110, it comes out of the groove 115 (see FIG. 5).

On the other hand, the interlocking arm 138 has a groove 115 formed on the first flanges 114 of the first roller 112 by the striker 136 when the tailgate 10 is opened by the operation of the opening and closing operation unit 110. ) Guides the unlocking slider 132 to fit into the groove, and when the tailgate 10 closes by the operation of the opening/closing operation unit 110, the striker 136 comes out of the groove 115. ) to guide

To this end, the interlocking arms 138 are provided as a pair, and one end of the interlocking arms 138 extends through the first hinge pins P1 to the outer surface of the first flange 114 of the first roller 112, respectively. The upper and lower ends of the interlocking arms 138 are pivotally connected to both sides of the locking slider 132 via the second hinge pins P2, respectively.

At this time, on both sides of the rail 134, second hinge pins (P2) are allowed to pass through for connection with the unlocking slider 132, and the second hinge pins (P2) are in the longitudinal direction of the rail 134 A guide hole 140 to be guided along is formed.

The guide holes 140 are formed to extend along the longitudinal direction of the rail 134 from one end side of the rail 134 facing the first roller 112 to the other end side, as shown.

That is, when the tailgate 10 is opened by the operation of the opening and closing operation unit 110, one end side of the interlocking arm 138 connected to the first flange 114 via the first hinge pin P1 is connected to the first roller ( 112), rotates counterclockwise along the first flange 114 and the tailgate 10, and as one end of the interlocking arm 138 rotates counterclockwise in this way, the other end of the interlocking arm 138 rotates The unlocking slider 132 is moved to the first roller 112 side, and the striker 136 of the unlocking slider 132 moved to the first roller 112 side is inside the groove 115 formed in the first flange 114. into the groove 115 (see FIG. 4).

In this way, since the striker 136 of the unlocking slider 132 is inserted into the groove 115, it is possible to prevent the open tailgate 10 from being arbitrarily closed by its own weight.

Conversely, when the tailgate 10 is closed by the operation of the opening/closing operation unit 110, the first roller ( 112), rotates clockwise along the first flange 114 and the tailgate 10, and as one end of the interlocking arm 138 rotates clockwise in this way, the other end of the interlocking arm 138 rotates the slider 132 is moved away from the first roller 112 side, and the striker 136 is formed on the first flange 114 by the sliding slider 132 moving away from the first roller 112 side. It comes out of the groove 115, whereby the rotating shaft 14 and the tailgate 10 rotate clockwise and are closed (see FIG. 5).

On the other hand, in the tailgate 10 connected to the automatic tailgate opening and closing device 100 for a dump truck according to the present invention, since the first and second rollers 112.116 and the chain 124 slide mutually, the conventional dump truck Like the tail gates of a truck, when the load box 20 is tilted backward, the rear end of the load box 20 is opened while being perpendicular to the ground by its own weight around the rotation shaft 14, and on the contrary, the tail gate 10 opens the load box ( When 20) is returned to its original state (seated on the chassis frame), the rear of the loading box 20 is closed like the tailgates of a conventional dump truck.

The automatic opening and closing device 100 for a dump truck according to the present invention formed as described above allows the tailgate 10 to be automatically opened and closed even when the loading box 20 is seated on the chassis frame 30, and the open tailgate The gate 10 can be safely supported.

Claims (7)

A loading box with brackets fixed at the top of the aft end of both side walls;
Rotating plates are fixedly installed on both sides of the upper end, and rotating shafts are fixedly installed on the rotating plates so as to be able to pivot in the vertical direction on the brackets. a tailgate that opens the rear of the loading box while forming and closes the rear end of the loading box when the loading box is seated on the chassis frame;
an opening/closing operation unit that allows the tailgate to be opened or closed while the load box is seated on the chassis frame; and
A control unit supporting the tailgate opened by the opening/closing operation unit,
The opening and closing operation unit,
a first roller installed to be fixed to the rotational shaft, the length of which extends toward the outer surface of the side wall and is exposed;
a second roller rotatably installed on a fixed shaft fixed to the lower side of the outer surface of the side wall facing the rotating shaft in the vertical direction; and
It is fixedly installed on the lower side of the outer surface of the side wall to extend the cylinder rod toward the second roller and return the extended cylinder rod away from the second roller, the first roller and the second roller Including; an opening and closing cylinder connected to the tailgate via a chain passing through,
When the opening/closing cylinder returns the cylinder rod, the tailgate opens, and when the opening/closing cylinder extends the cylinder rod, the tailgate closes.
the control department,
an unlocking slider interlocking with the first roller to regulate and release the first roller; and
An automatic tailgate opening and closing device for a dump truck comprising: an interlocking arm interlocking the rail unlocking slider with the first roller.
delete The method of claim 1,
A first flange is formed on both sides of the first roller to protrude along the outer circumferential surface of the first roller,
On the outer circumferential surface of the first flange, a groove for entering and exiting the striker of the intermittent portion is formed to be recessed toward the rotational center of the first flange.
The method of claim 1,
One end of the chain is connected to the extension end of the cylinder rod,
The other end of the chain is connected to the rotation plate installed on the top of the tailgate via the lower part of the second roller and the upper part of the first roller,
An automatic tailgate opening and closing device for a dump truck, wherein a linkage to which the other end of the chain is connected faces the first roller on the rotating plate.
delete The method of claim 1,
The rule-of-thumb slider,
It is slidably installed inside a square tube-shaped rail installed via subframes on the upper side of the outer surface of the side wall so as to be closer to or away from the first roller,
A striker having a circular cross section intersecting in a direction perpendicular to the turning direction of the first roller is installed on one side of the sliding unlocking slider facing the first roller,
The striker is inserted into the groove formed in the first flanges of the first roller when the tailgate is opened by the operation of the opening and closing operation unit, and comes out of the groove when the tailgate is closed by the operation of the opening and closing operation unit. Tailgate automatic opening and closing device for dump trucks.
The method of claim 6,
The interlocking arms are provided as a pair,
One end sides of the interlocking arms are pivotally connected to the outer surfaces of the first flanges in the up and down direction via first hinge pins, and the other ends of the interlocking arms are connected via second hinge pins, respectively, to the locking sliders. It is connected to both sides of the up and down direction to be able to turn,
Guide holes are formed on both sides of the rail to allow the second hinge pin to be connected to the rail unlocking slider and to guide the second hinge pin along the longitudinal direction of the rail,
When the tailgate is opened by the operation of the opening and closing operation unit, one end of the interlocking arm rotates in a counterclockwise direction along the first flange to move the locking slider toward the first roller so that the striker moves inside the groove. to be inserted into
When the tailgate is closed by the operation of the opening/closing operation unit, one end side of the interlocking arm rotates clockwise along the first flange and moves the sliding locking slider away from the first roller, so that the striker is A tailgate automatic opening and closing device for dump trucks that allows it to come out of the groove.

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