KR20210019903A - Cargo box lock device on rear dump vehicle - Google Patents

Abstract

The present invention relates to a cargo box locking device for a rear dump vehicle and, more specifically, to a cargo box locking device for a rear dump vehicle, capable of improving stability and convenience for a worker by preventing a locking device of a door (12) of a cargo box (11) opened and closed as the cargo box (11) is inclined backward and having a structure discharging cargo through a slope, from being unexpectedly opened even with vibrations of a vehicle or a shock. The cargo box locking device includes: an engagement bar (20) protruding from the bottom of the door (12) in a horizontal direction; a driving shaft (30) installed in a lower part of the rear of the cargo box (11) in a horizontal direction to be rotatable, and having a hook (31) protruding to the rear to hook and fix the engagement bar (20) through rotation; and a driving part (40) including a cylinder part (41) installed in a lower part of the cargo box (11) to be adjusted in length by air pressure in forward and backward directions, and a link part (42) connecting an end of the cylinder part (41) to the outer circumference surface of the driving shaft (30) to be rotatable.

Description

Cargo box lock device on rear dump vehicle {CARGO BOX LOCK DEVICE ON REAR DUMP VEHICLE}

The present invention relates to a locking device for a loading box of a rear dump vehicle, and more particularly, a door having a structure that opens and closes as the loading box is tilted rearward and discharges the load through the inclination is unintentionally opened even by vibration and impact of the vehicle. It relates to a loading box locking device of a rear dump vehicle that can prevent safety accidents by preventing, open and close a door by easily releasing a locking device by an operator, and simplify the structure of a loading box locking device of an existing rear dump vehicle.

A dump vehicle is a type of transport vehicle that loads various cargoes in a loading box and moves them to a desired place. The rear loading box is rotated in an inclined direction to the rear or side by a rope or mechanical device to unload the load. Dump (rear dump), the latter is called side dump (side dump).

Such a loading box has the advantage of being able to easily transport general miscellaneous goods and special cargo without external packaging, thereby reducing time and cost, and being able to transport in large quantities regardless of the size of the cargo.

The above-described rear dump vehicle is opened and operated by the weight of the loading box when the loading box is inclined to the rear, and by unloading the loading, the loading can be poured out to the rear without any separate operation, so that it is not sensitive to cargo damage, transporting civil works, construction materials or garbage. Mainly used in vehicles.

In the horizontally maintained state of such a loading box, the door is closed by its own weight so that the load is not discharged, but a locking device is installed to prevent it from being unintentionally opened due to shock or shaking, locking it during transportation and releasing the locking device during unloading, and then the dump type rear The door is opened to proceed with the unloading work.

However, in the case of the existing rear dump vehicle, the driving environment such as rough terrain is often severe, so external vibration or shock during driving is significantly more severe than that of a general vehicle, and there is a risk of a safety accident due to the loose locking device.

In addition, since the existing locking device has a complex structure exposed to the outside, there is a concern that dust or foreign matter may get on the locking device when unloading a load, and the complicated structure causes trouble for the operator when unlocking the locking device.

Korean Patent Registration No. 10-1516354 (2015.04.30.)

The present invention was created to solve the above problems, and an object of the present invention is to simplify the structure of the locking device of the loading box, so that the operator can safely and simply release the locking device to open and close the door. It is to provide a loading lock device.

Another object of the present invention is to provide a loading box locking device for a rear dump vehicle capable of stably maintaining the closed state of the door even when an external impact is applied while the door of the loading box is mechanically fixed. Is to do.

In addition, another object of the present invention is to provide a loading box locking device for a rear dump vehicle that protects the unloaded loads and external contamination by installing the driving unit of the locking device below the loading box.

For the above purposes, the present invention provides a locking device for a rear dump vehicle having a door hinged to an upper end of the loading box with the rear open and opened and closed by the inclination of the loading box, protruding horizontally from the bottom of the door. Formed fastening bar; A drive shaft which is installed in a horizontal direction at a lower portion of the rear side of the loading box and is rotatable, and a hook for fastening and fixing the fastening bar through rotation is formed to protrude to the rear side; It characterized in that it comprises a driving unit having a cylinder portion installed under the loading box and adjusted in a longitudinal direction by pneumatic pressure, and a link portion connecting the end of the cylinder portion to the outer peripheral surface of the drive shaft so as to be rotatable.

In this case, the drive shaft further includes a fixing protrusion protruding toward the front side, and a first elastic body having one end fixed to the fixing protrusion and the other end respectively fixed to the lower portion of the loading box and acting on a contraction force.

In addition, the loading box is in contact with the door at the rear, and the contact portion is extended downward so that a through portion through which the hook passes is formed.

In addition, the cylinder unit is composed of a rod and a cylinder that moves the rod forward and backward by pneumatic pressure, and is wrapped and connected to adjust the distance between the rod and the link unit, but forms a contraction or tension force between the rod and the link unit. It characterized in that it further comprises a buffer unit having a second elastic body formed so as to.

In addition, a bearing portion supporting both ends of the drive shaft at both sides of the lower portion of the loading box, a fixing bracket supporting the bearing portion but having a support hole allowing movement in the front-rear direction, and a third acting to push the bearing portion rearward. It characterized in that it comprises an elastic body.

According to the loading box locking device of the rear dump vehicle according to the present invention, the locking device structure is simplified through the cylinder using the pneumatic pressure, so that the operator can safely and easily open and close the locking device by a simple operation.

In addition, according to the present invention, there is an advantage of strengthening the fastening force of the locking device by helping the rotation of the drive shaft by forming a contraction or tension force between the rod and the link portion of the cylinder through the second elastic body.

In addition, according to the present invention, the friction force between the bearing part and the fixing bracket is reduced through the third elastic body, thereby assisting the forward and backward movement of the drive shaft, thereby acting as a buffer, and strengthening the fastening force of the locking device so that the load between the door and the open part is There is an advantage of preventing safety accidents by preventing the locking device from loosening if it is caught.

In addition, according to the present invention, since the driving structure of the locking device is installed below the loading box, there is an effect of protecting the driving structure of the locking device from unloading loads and external contamination.

1 is a perspective view showing a loading box structure of a rear dump vehicle to which the present invention is applied,
2 is a perspective view showing the installation structure according to the first embodiment of the present invention from the lower side;
3 is an operation diagram showing the operation of the loading box locking device according to the first embodiment of the present invention,
4 is a cross-sectional view showing an installation structure of a first elastic body according to a first embodiment of the present invention;
5 is an operation diagram showing the operation of the loading box locking device according to the second embodiment of the present invention,
6 is a perspective view showing an installation structure according to a third embodiment of the present invention from below.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration according to the loading box locking device of the present invention a rear dump vehicle.

<First Example>

1 is a perspective view showing the structure of a rear dump vehicle to which the present invention is applied, FIG. 2 is a perspective view showing an installation structure according to a first embodiment of the present invention from below, and FIG. 3 is a first embodiment of the present invention. Fig. 4 is a cross-sectional view showing the installation structure of the first elastic body according to the first embodiment of the present invention.

The first embodiment of the present invention is basically applied to a dump vehicle having a loading box 11 and a door 12 for opening and closing it, and a structure for fixing the door 12 is presented.

The loading box 11 is a structure that is located at the rear side of a conventional dump vehicle to load cargo, and has a structure capable of pouring out loads as one is open and inclined toward the open side. Typically, the open portion is formed to the side or rear, and shows a rear dump structure that is open to the rear as shown in FIG. 1.

This opening is opened and closed through the door 12, hinged to the upper end of the opening, rotates in an inclined direction, and the door 12 is installed so that the load can be discharged into a space spaced apart from the loading box 11 at the bottom.

At this time, the opening portion has a downward inclined structure, and the door 12 having a certain weight contacts the edge of the opening portion, and is covered with its own weight in the horizontal state of the loading box 11 to block the opening portion.

A fastening bar 20, which is a structure that is fastened to a fixing means to be described later, to prevent opening of the door 12, is provided below the door 12.

The fastening bar 20 is formed in the shape of a circular bar protruding in the horizontal direction, and connects both ends of the fastening bar 20 to the door 12, respectively, but a space between the fastening bar 20 and the door 12 is provided. A pair of shaft brackets 21 to form are provided.

At least one of the fastening bars 20 is provided as a part for fixing the door 12, and the number may be increased in correspondence with the width of the door 12 for stable door 12 fixing.

In the accompanying drawings, as a preferred embodiment, two fastening bars 20 are shown, but this is not limited thereto.

As shown in FIG. 2, a driving shaft 30 and a driving part 40 are provided under the loading box 11 in a structure for fixing the door 12 by being fastened to the fastening bar 20.

The drive shaft 30 is installed to be rotatable in a horizontal direction, that is, in a form that crosses left and right parallel to the door 12 at a lower rear side of the loading box 11.

Specifically, the coupling is made through the bearings and the lower side of the loading box 11 at both ends, and hooks 31 are formed on the outer circumferential surface of the drive shaft 30 so as to be hooked and fixed to the fastening bar 20 through rotation.

At this time, the distance between the drive shaft 30 and the fastening bar 20 and the size of the hook 31 are appropriately adjusted, and as mentioned above, as a plurality of fastening bars 20 are provided, corresponding to each fastening bar 20 It is obvious that the hook 31 must be provided so as to be.

That is, as shown in Fig. 3(a), when the length of the rod 41a is shortened, the drive shaft 30 rotates in one (一) direction, and the hook 31 is coupled to the fastening bar 20, the door (12) is not open, as shown in Figure 3 (b), when the length of the rod (41a) is long, the drive shaft 30 is rotated in the opposite direction and the hook 31 is separated from the fastening bar 20 Only in the state, the locking device is released so that the door 12 can be opened.

The drive unit 40 for rotation of the drive shaft 30 is formed through a structure of the cylinder part 41 whose length is variable according to an external drive signal input.

The cylinder part 41 may be configured through various actuators operated through pneumatic or hydraulic, including electric, and in the embodiment of the present invention, the cylinder part 41 is configured through a pneumatic actuator.

This reflects the structure in which the loading box 11 is exposed to the outside. As a general dump vehicle is equipped with a compressor for driving the brake, etc., compressed air can be easily obtained so that separate devices such as an electric motor, hydraulic motor and tank are not added. There is an advantage to be able to. In addition, compared to the electric drive method, the risk of a short circuit or leakage of the working fluid, such as the hydraulic method, has the advantage that damage is minimal and measures can be easily taken.

In this cylinder part 41, a cylinder part 41 that is length-adjusted in the front and rear direction by pneumatic pressure is installed toward the drive shaft 30, and the end of the cylinder part 41 can be rotated on the outer circumferential surface of the drive shaft 30 Connection is made through the link unit 42 so as to be.

That is, the link part 42 converts the reciprocating motion of the cylinder part 41 into a rotational motion of the drive shaft 30.

At this time, the cylinder part 41 is fixed while lying on the lower surface of the loading box 11, and the support 43 in the form of a'C' so that it can be securely fixed in response to the force toward the drive shaft 30. Installation takes place through

In addition, there is a need for a structure to prevent dust or foreign substances that may be generated during unloading of the load accommodated in the load box 11 scatter to the drive shaft 30 and the drive unit 40 and prevent contamination, accumulation and fixation.

To this end, the loading box 11 is in contact with the door 12 at the rear side, but the contact portion is extended downward so that the through portion 32 through which the hook 31 passes is formed so that the unloaded load is transferred to the drive shaft 30 and It is preferable to configure so as not to scatter toward the drive unit 40.

With this structure, the door 12 can be fixed, but as mentioned above, external shock or vibration, including leakage or failure of the cylinder, is added, and the drive shaft 30 unintentionally rotates and the hook 31 is fastened. As it can be separated from the bar 20, as an additional safety device, a structure that acts to maintain the fastening state of the hook 31 and the fastening bar 20 at all times is provided.

That is, as shown in Figure 4, the drive is formed with a fixing protrusion 45 protruding toward the front, one end is fixed to the fixing protrusion 45 and the other end to the lower portion of the loading box 11, respectively. It is to install the first elastic body 51 on which the contraction force acts.

The first elastic body 51 has a configuration in which a contractive force such as a spring acts, and a fixing protrusion 45 is formed so that the hook 31 is fixed to the fastening bar 20 and a contractive force is applied. , Basically, the hook 31 is always in a fastening state with the fastening bar 20, and the cylinder part 41 rotates the drive shaft 30 with a force greater than or equal to the acting force of the first elastic body 51, and the hook 31 ) To be separated from the fastening bar (20).

The first elastic body 51 is fixed to the lower portion of the loading box 11 through a turnbuckle 44 whose other end is adjustable in length, and the contraction force can be adjusted through length adjustment of the turnbuckle 44.

Likewise, the turnbuckle 44 is also firmly fixed to the contraction force acting through the'U' shaped fixing protrusion 45 so that the turnbuckle 44 can be firmly fixed to the bottom of the loading box 11.

<Second Example>

Next, a second embodiment of the locking device for a rear dump vehicle according to the present invention will be described. In the present embodiment, the same reference numerals are used for components corresponding to the first embodiment.

5 is an operation diagram showing the operation of the loading box locking device according to the second embodiment of the present invention.

As shown in Figure 5, in this embodiment, an elastic body is additionally mounted between the link portion 42 and the cylinder portion 41.

The cylinder part 41 is composed of a rod 41a and a cylinder 41b that moves the rod 41a forward and backward by pneumatic pressure. A second elastic body 52 formed to be wrapped and connected so as to adjust the distance between the rod 41a and the link portion 42 and to apply an additional tensile force between the rod 41a and the link portion 42 is further provided. Equipped.

As shown in Fig. 5(a), when the length of the rod 41a is shortened, the drive shaft 30 rotates in one (一) direction, and the hook 31 is coupled with the fastening bar 20, the door 12 ) Is not opened, and when the length of the rod 41a becomes longer as shown in FIG. 5(b), the drive shaft 30 rotates in the opposite direction so that the hook 31 is separated from the fastening bar 20 only. The locking device is released so that the door 12 can be opened.

The second elastic body 52 acts as a buffer, thereby releasing the locking device so that the operator can easily open and close the door 12 when opening and closing the door 12.

In addition, the second elastic body 52 can be kept in a completely closed state by using an additional tensile force when a foreign material is caught in the door 12 of the loading box 11 or is not completely closed due to an external impact.

<Third Example>

Next, a third embodiment of the locking device for a rear dump vehicle according to the present invention will be described. In the present embodiment, the same reference numerals are used for components corresponding to the first embodiment.

6 is a perspective view showing an installation structure according to a third embodiment of the present invention from below.

As shown in FIG. 6, in this embodiment, bearing portions 60 supporting both ends of the drive shaft 30 respectively at both sides of the lower portion of the loading box 11 and the bearing portions 60 are supported, but Including a fixing bracket 62 having a support hole 61 that allows the movement to be formed, and a third elastic body 53 installed in the support hole 61 and acting to push the bearing part 60 to the rear side. Done.

That is, the support hole 61 is made of a radius in which the drive shaft 30 can move in the front-rear direction, and in the support hole 61, the third elastic body 53 supports the bearing part 60 to the rear side. It plays a role of pushing and closes the loading box 11 while pushing the bearing part 60 to the rear through the third elastic body 53 when a load is caught between the door 12 and the opening part. Functions.

In this way, when the lock device of the loading box 11 is released and the door 12 is opened and closed, the second elastic body 52 forms a contraction or tension force between the rod 41a and the link part 42 to form the driving shaft. It is possible to strengthen the tightening force of the locking device by helping the rotation of (30).

In addition, the third elastic body 53 reduces the frictional force between the bearing part 60 and the fixing bracket 62 to help the drive shaft 30 move in the front and rear direction, thereby providing a buffering function, which allows the operator to perform a simple operation. It is possible to easily perform the operation of the locking device of the loading box (11).

In addition, the cylinder part 41 has the advantage that the structure is simple because a pneumatic cylinder using pneumatic pressure is applied, the pin slide speed is fast, so it is easy to use, and is safe against overload.

The rear dump vehicle loading box locking device according to the present invention is applicable not only to a rear dump type that is opened while inclining to the rear, but also to a side dump type that is opened to a side.

The rights of the present invention are not limited to the embodiments described above and are defined by what is described in the claims, and that a person with ordinary knowledge in the pre-sale of the present invention can make various modifications and adaptations within the scope of the rights described in the claims. It is self-evident.

11: loading box 12: door
20: fastening bar 21: shaft bracket
30: drive shaft 31: hook
32: penetrating part 40: driving part
41: cylinder part 41a: rod
41b: cylinder 42: link portion
43: support 44: turnbuckle
45: fixing protrusion 51: first elastic body
52: second elastic body 53: third elastic body
60: bearing part 61: support hole
62: fixing bracket

Claims (5)

In the loading box locking device of a rear dump vehicle having a door 12 that is hinged to an upper end of the loading box 11 that is open to the rear and opened and closed by the inclination of the loading box 11,
A fastening bar 20 protruding in the horizontal direction at the lower end of the door 12;
A drive shaft 30 which is installed in a horizontal direction below the rear side of the loading box 11 and is rotatable, and a hook 31 for fastening and fixing the fastening bar 20 through rotation is formed to protrude rearward;
A cylinder part 41 installed under the loading box 11 and adjusted in the front and rear direction by pneumatic pressure, and a link part 42 connecting the end of the cylinder part 41 to the outer circumferential surface of the drive shaft 30 so as to be rotatable. ) A driving unit 40 having; Locking device for a rear dump vehicle, characterized in that it comprises a. The method of claim 1,
The drive shaft 30 further includes a fixing protrusion 45 protruding toward the front side,
A loading box locking device for a rear dump vehicle, characterized in that it further comprises a first elastic body (51) whose one end is fixed to the fixing protrusion (45) and the other end is fixed to a lower portion of the loading box (11), respectively. The method of claim 1,
The loading box 11 is in contact with the door 12 in the rear, but the contact portion is extended downward so that the through portion 32 through which the hook 31 passes is formed. . The method of claim 1,
The cylinder part 41 is composed of a rod 41a and a cylinder 41b that moves the rod 41a forward and backward by pneumatic pressure, and the gap between the rod 41a and the link part 42 can be adjusted. And a second elastic body 52 formed to form a contraction or tensile force between the rod (41a) and the link portion (42) but connected so as to be able to be wrapped. The method of claim 1,
Bearing units 60 supporting both ends of the drive shaft 30 at both sides of the lower portion of the loading box 11, and support holes 61 supporting the bearing units 60 but allowing movement in the front and rear directions are formed. A locking device for a rear dump vehicle, comprising: a fixing bracket (62) and a third elastic body (53) acting to push the bearing portion (60) to the rear.

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