KR20200120312A - Weight balance adjustable agricultural forklift - Google Patents

Abstract

The present invention relates to a weight balance-adjustable agricultural forklift, which is able to adjust, when performing work at a position out of the center of gravity of the forklift, the weight balance in accordance with the position of a fork which lifts cargo. According to the present invention, the forklift comprises: a vehicle body frame which is able to drive by having crawlers placed on both sides; a mast unit placed on the vehicle body frame to be elevated/lowered by an elevation cylinder; a carriage placed to be elevated/lowered by being engaged with the mast unit; a side shift unit which includes a shift frame slid from the carriage, and a shift cylinder moving the shift frame to the left side and the right side from the carriage; and a fork unit which is mounted on the carriage through the side shift unit to lift the cargo with a pair of fork feet. The vehicle body frame may include a balance adjustment unit which moves a counter weight in the opposite direction to the moving direction of the fork unit and thus, keeps the balance of the vehicle body so as to correspond to the center of gravity of the forklift moved in accordance with changes in the position of the fork unit.

Description

Agricultural forklift with adjustable balance{WEIGHT BALANCE ADJUSTABLE AGRICULTURAL FORKLIFT}

The present invention relates to a forklift, and more particularly, to an agricultural forklift capable of adjusting the balance to adjust the weight balance according to the position of a fork lifting a cargo when performing work at a position outside the center of gravity of the forklift. will be.

In general, in various workplaces, forklifts are used to lift and unload cargo or to transport the cargo to a required location.

Such a forklift is provided with a mast assembly vertically installed in front of a movable vehicle body, and a fork that lifts and descends by hydraulic pressure is mounted on the mast assembly, and the forklift can easily move and load the cargo by elevating the cargo by the fork. Accordingly, forklifts are widely used for transporting and loading or transferring cargo in industrial sites and distribution centers.

However, such a general forklift is difficult to use in off-road agricultural environments represented by orchards, rice paddies, fields, barns, etc. as the driving wheel is composed of tires. In particular, the ground condition is not flat and has many curved hills. Due to the nature of the forklift, it has a condition that can cause frequent overturning of the forklift.

Accordingly, the applicant of the present invention has proposed an agricultural forklift to which a crawler wheel is applied in Korean Patent Registration No. 10-1809847 (registration date: 2017.12.14, hereinafter referred to as'prior art document 1'), and in prior art document 1, forklift The wheel of the car is composed of a so-called crawler, so that stable work is possible in an off-road environment.

On the other hand, the conventional agricultural forklift used in an agricultural environment does not lift the cargo by inserting a fork on the pallet while the cargo is loaded on a standardized pallet. Instead, the cargo is directly lifted with a fork of the forklift. I used to.

In other words, conventional forklifts were used to directly lift and transport cargo such as wood, drums, round and square bales, and structurally, by installing side shifting devices or fork positioners used in general forklifts, It was used by moving the position of the fork from side to side or adjusting the distance between the forks according to the loading position, shape and size.

However, unlike industrial sites on flat land, in the off-road agricultural environment mentioned above, if the forklift cannot approach the cargo in the forward direction due to working conditions, use a shift device to place the fork in a position outside the center of gravity of the forklift. There may be a situation in which a cargo must be lifted while it has been moved, and in this case, if the lifted cargo is heavy, there is a problem that the center of gravity is shifted and the forklift may not bear the weight of the cargo and may overturn.

In addition, in an agricultural environment, the ground has a lot of curves and is not flat, so the grip with the ground is lower than that of a general flat ground. Therefore, when the work is performed with the center of gravity shifted to one side, the lifting or movement of the forklift is somewhat limited. There is a problem that can be.

KR 10-1809847 B1

The present invention was conceived to solve the above problems, and the forklift of the present invention relates to the center of gravity of the forklift, which varies according to the movement of the fork, when lifting a cargo while the fork is shifted to the left or right. A structure that can adjust the left and right balance of the vehicle body is provided, and the task is to prevent the center of gravity from shifting to one side.

In order to solve the above problems, the agricultural forklift capable of adjusting the balance of the present invention is provided with a crawler on both sides of a vehicle body frame capable of running, a mast unit provided on the vehicle body frame and operated by an elevation cylinder, and is coupled to the mast unit. A carriage provided to elevate, a shift frame sliding left and right from the carriage, a side shift unit having a shift cylinder that moves the shift frame left and right with respect to the carriage, and a pair of mounted on the carriage through the side shift unit to lift cargo. It includes a fork portion having a fork foot, and a balance control unit that maintains the balance of the vehicle body by moving the counter weight in a direction opposite to the moving direction of the fork portion so as to correspond to the center of gravity of the forklift that is moved according to the position change of the fork portion It can be provided.

In addition, the balance control unit may include a counter weight, which is a weight, and a weight moving unit for moving the counter weight to the left and right directions of the vehicle body frame.

In addition, the balance control unit may move the counter weight to a position outside the outer side of both crawlers.

In addition, the weight moving unit includes a fixed guide plate installed on the vehicle body frame and having a rail groove formed on the upper surface thereof, a moving guide plate movably coupled to the fixed guide plate by forming a rail protrusion fitted into the rail groove, and a moving guide It may include a reciprocating cylinder for moving the plate in both directions.

Furthermore, the reciprocating cylinder may be provided as a bidirectional cylinder that moves in both directions by fixing both ends of the piston rod to the vehicle body frame, and a connection bracket for connecting the reciprocating cylinder to the movement guide plate may be further provided.

The forklift of the present invention, when lifting a cargo while the fork is shifted to the left or right, is provided with a structure capable of adjusting the left and right balance of the vehicle body, thereby lifting the cargo while the position of the fork is off the center of the forklift. Even if it is raised, the center of gravity is prevented from shifting to one side, thereby preventing the risk of the forklift from falling.

1 is a schematic perspective view of an agricultural forklift capable of adjusting the balance according to the present invention.
FIG. 2 is a diagram illustrating a mast unit and a fork part of an agricultural forklift capable of adjusting a balance according to the present invention, respectively, from a vehicle body part.
3 is a front view of an agricultural forklift capable of adjusting the balance according to the present invention from the front, showing a state in which the mast unit is moved to the rear side.
Figure 4 is a front view showing the balance adjustable agricultural forklift according to the present invention from the front, showing a state in which the mast unit is moved to the front side.
5 shows an operation diagram of an agricultural forklift capable of adjusting the balance according to the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to embodiments to be described later in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms.

Hereinafter, the technical features of the present invention will be described in detail with reference to the accompanying drawings.

The forklift according to the present invention is provided with a crawler 120 rotating on both sides as a vehicle body 100 as shown in FIGS. 1 to 5 and installed on a vehicle body frame 110 and a vehicle body frame 110 capable of running A carriage that includes a main body 130 that is coupled to the front of the body frame 110 and includes a mast unit 200 for lifting and lowering, and is coupled to the mast unit 200 as a lifting unit 300 to move up and down. 310 and a fork part 320 mounted on the carriage 310 to lift cargo, and a side shift unit 330 for moving the fork part 320 relative to the carriage 310 in the carriage 310 The vehicle body frame 110 may be provided with a balance adjusting unit 400 for maintaining the vehicle body balance so as to correspond to the center of gravity of the forklift that is moved according to the position change of the fork unit 320.

As shown in FIGS. 1 and 2, the body frame 110 is provided with crawlers 120 on both sides, and a main body 130 is provided on the upper surface thereof.

The main body 130 is provided with an operation unit capable of operating a forklift and a fork operation as a control unit, and a driving device for driving the crawler 120 is inserted therein. It is preferable to include a motor for driving each of the crawlers 120 on the left and right sides. In this way, the motors are provided on both sides, so that both crawlers 120 can be independently driven. Accordingly, the body frame 110 supporting the main body 130 is provided to be driven by the crawler 120 rotating as a driving device.

Meanwhile, a hinge plate 111 is fixedly formed at the rear end of the vehicle body frame 110, and a footrest 112 for the operator to board is hinged to the hinge plate 111, so that the footrest 112 is a hinge part ( 113) is rotated at an angle of 90 degrees in the hinge plate 111. Therefore, when using the scaffold 112, the scaffold 112 is rotated from the body frame 110 to spread and fix vertically with respect to the rear end of the body frame 110, and when not in use, the unfolded scaffold 112 is rotated in reverse. So that it is provided in parallel with the rear end surface of the vehicle body frame 110.

Further, the vehicle body frame 110 is provided with a reciprocating cylinder 140 for reciprocating the mast unit 200 back and forth. The reciprocating cylinder 140 is a hydraulic cylinder, and one end thereof is rotatably coupled to the vehicle body frame 110, and a piston rod 141 is provided to enter and exit at the opposite end thereof. The piston rod 141 of the reciprocating cylinder 140 is rotatably coupled to the mast unit 200 provided at the front end of the body frame 110 to move the mast unit 200 back and forth. Accordingly, when the cargo is lifted through the fork unit 320 to be described later, when the load acting on the fork unit 320 is out of the allowable value, while moving the mast unit 200 reciprocating through the reciprocating cylinder 140 Try to balance the front and rear of the forklift.

In addition, a pair of guide rails 150 are provided in parallel on both sides of the body frame 110 to guide the mast unit 200 that is extended forward and moved by the reciprocating cylinder 140. The guide rail 150 is formed in a "C" shape so that the inner surfaces thereof face each other.

The mast unit 200 is located and provided in front of the body frame 110. The mast unit 200 includes a moving plate 210 installed to be reciprocally movable in the front-rear direction on the body frame 110 and a mast assembly moved by the moving plate 210, and the mast assembly includes a moving plate ( It includes a pair of outer masts 220 that are rotatably coupled to 210, and a pair of inner masts 230 that are slidably coupled to the inner surface of the outer mast 220.

The moving plate 210 has a plurality of guide rollers 211 rotatably provided on both sides thereof, and the guide roller 211 is inserted into the inner surface of the guide rail 150 provided in the body frame 110. It is clouded in the state. In addition, the piston rod 141 of the reciprocating cylinder 140 provided in the vehicle body frame 110 is rotatably coupled to the rear end of the moving plate 210, and the piston rod 141 in the reciprocating cylinder 140 As is in and out, the moving plate 210 moves back and forth along the guide rail 150.

In addition, a tilt cylinder (not shown) is provided under the moving plate 210. This tilt cylinder has one end rotatably coupled to a lower portion of the moving plate 210, a piston rod is provided to enter and exit at an opposite end thereof, and a front end of the piston rod is rotatably coupled to a mast assembly to be described later. Accordingly, as the piston rod enters and exits the tilt cylinder, the mast assembly is tilted from the moving plate 210.

Here, hinge grooves 210a to which the hinge shafts 220a of the outer mast 220 are inserted and coupled are formed on the upper surfaces of both ends of the moving plate 210, and the moving plate 210 is located above the hinge grooves 210a. A fixing block 211 is provided to be coupled and fixed to the upper surface of the outer mast 220 to couple and fix the hinge shaft 220a of the outer mast 220 in a rotatable state.

As a mast assembly, the outer mast 220 is provided to be integrally fixed by a plurality of fixing brackets 221 crossing the outer mast 220 on both sides of the rear portion thereof, and the inner mast 230 is provided on the upper surface thereof. It is provided to be integrally fixed by a connection bracket 231 crossing the inner mast 230 of.

On the other hand, both outer masts 220 provided as described above have their outer surfaces hinged to the moving plate 210, and the lower fixing brackets among the plurality of fixing brackets 221 fixing both outer masts 220 ( The piston rod of the tilt cylinder is rotatably coupled to 221.

Accordingly, as the piston rod enters and exits the tilt cylinder, the mast assembly is tilted and rotated based on the hinge axis of the outer mast 220.

In addition, a plurality of rollers 222 provided vertically are installed on the inner surfaces of both outer masts 220 facing each other, and the inner mast is installed on the inner surface of the outer mast 220 by the rollers 222. 230 is provided to be slidably coupled in the vertical direction.

Such a mast assembly is provided with a lifting cylinder 240 between the upper connection bracket 231 connecting the inner mast 230 and the lower fixing bracket 221 connecting the outer mast 220, and the lifting cylinder ( As the piston rod of 240) is moved up and down, the inner mast 230 is moved up and down in the outer mast 220 to perform a lifting operation. In addition, the front of the inner mast 230 is provided with a carriage 310 that is connected by a chain 250 to be raised and lowered.

The carriage 310 is formed as a rectangular frame, and a pair of vertical plates 311 connecting the upper and lower frames across the upper and lower frames are provided to protrude toward the rear side in parallel with each other. The vertical plate 311 may have a rotating roller 312 installed on the outside so as to be coupled to the inner rails of both inner masts 230, respectively, and a chain extending from the connection bracket 231 located above the inner mast 230 When the lifting operation is performed up and down by 250, the rotary roller 312 moves up and down along the inner mast 230, thereby enabling a stable lifting operation. And, the front of the carriage 310 is provided with a "b"-shaped fork portion 320.

The fork part 320 includes fork feet 321 on both sides, and can be mounted on the carriage 310 through a side shift unit 330 to be described later, and is moved together with the carriage 310 to lift cargo. It is prepared to be

At this time, the fork portion 320 is provided with a side shift unit 330 that connects the fork portion 320 to the carriage 310 so as to be shiftable left and right.

The side shift unit 330 includes a shift frame 331 that slides left and right in the carriage 310 and a shift cylinder 332 that moves the shift frame 331 left and right with respect to the carriage 310, The fork part 320 is connected to the carriage 310 so as to be shiftable left and right.

In addition, the fork portion 320 may be provided with a fork positioner 340 for moving both fork feet 321 left and right, respectively, and the fork positioner 340 moves each fork foot 321 to the left or right It includes a pair of cylinders 341 arranged in parallel so as to move in the direction, and both cylinders 341 are provided in opposite directions.

In such a forklift, the fork portion 320 may be moved in both directions of the carriage 310 by the side shift unit 330, and the center of gravity of the forklift is changed according to the movement of the fork portion 320.

Accordingly, the forklift of the present invention is provided to adjust the position of the weight according to the position change of the fork part 320. That is, the vehicle body frame 110 may include a balance adjusting unit 400 for moving the center of gravity to correspond to the center of gravity of the forklift moved according to the position change of the fork unit 320.

The balance control unit 400 includes a counter weight 410 which is a weight, and a weight moving unit 401 for moving the counter weight 410 in the left and right directions of the body frame 110, and the fork unit 320 The counterweight 410 is moved in the opposite direction corresponding to the moving direction to maintain the balance of the vehicle body.

The counter weight 410 may include a plurality of weight members formed in a plate shape and stacked. These counter weights 410 may be installed on the vehicle body frame 110, and are stacked and installed on the movement guide plate 430 of the weight movement unit 401 to be described later. At this time, the counter weight 410 may be provided to be larger than the size shown in the embodiment of the present invention to increase the weight, and may also be provided in a shape having a larger size of itself. That is, the counter weight 410 can be installed by increasing or decreasing the number of weight members in proportion to the weight of the cargo to be transported through the forklift or replacing them with other sized members, which are bolted to the movement guide plate 430 to be replaced. It can be provided to facilitate.

The weight moving unit 401 includes a fixed guide plate 420 installed on the vehicle body frame 110 and a moving guide plate 430 that is movably coupled to the fixed guide plate 420 and supports the counter weight 410, It includes a reciprocating cylinder 440 for moving the movement guide plate 430 in both directions.

The fixing guide plate 420 is a plate-shaped member and is installed across both sides of the vehicle body frame 110, and rail grooves 421 in the form of grooves or through holes are formed on the upper surface thereof. At this time, the rail groove 421 is formed along the longitudinal direction of the fixed guide plate 420 to guide the movement of the moving guide plate 430.

The movement guide plate 430 is fitted into the rail groove 421 and laminated on the upper surface of the fixed guide plate 420, and a rail protrusion 431 corresponding to the rail groove 421 protrudes from the lower surface thereof. Accordingly, the movement guide plate 430 may be moved along the rail groove 421 of the fixed guide plate 420 due to the combination of the rail groove 421 and the rail protrusion 431.

The reciprocating cylinder 440 includes a cylinder housing 441 and a pair of piston rods 442 and 443 respectively extending and contracting in the longitudinal direction at both ends of the cylinder housing 441. At this time, the reciprocating cylinder 440 is provided so that both ends of the piston rods 442 and 443 are fixed to the vehicle body frame 110, so that the cylinder housing 441 can reciprocate along the longitudinal direction. The housing 441 is connected to the movement guide plate 430 to move the movement guide plate 430 together.

Here, the weight moving unit 401 is provided with a connection bracket 450 to connect the cylinder housing 441 of the reciprocating cylinder 440 to the movement guide plate 430. The connection bracket 450 includes a pair of block members covering both sides of the outer circumferential surface of the cylinder housing 441, respectively, and the bridge 451 extending from the block member toward the side of the adjacent movement guide plate 430 The housing 441 is connected to the movement guide plate 430.

With this configuration, the weight movement unit 401 operates so that the movement guide plate 430 can be moved together with the cylinder housing 441 according to the expansion and contraction operation of the reciprocating cylinder 440.

In this case, in the embodiment of the present invention, the balance control unit 400 is shown as being installed on the upper portion of the vehicle body frame 110, but may be installed under the vehicle body frame 110. This is a configuration so that the inner space of the vehicle body frame 110 can be utilized a little more. That is, between the main body 130 and the mast unit 200 located above the body frame 110, there is provided a moving space in which the mast unit 200 can be moved forward and backward, and the balance is adjusted within this moving space. As the unit 400 is disposed, the moving distance of the mast unit 200 can be reduced, so that the balance adjusting unit 400 is installed under or inside the vehicle body frame 110 to exclude a limited situation. will be. The position of the balance control unit 400 may be a lower portion of the footrest 112 of the body frame 110 where the main body 130 is located.

Meanwhile, in an embodiment of the present invention, the balance control unit 400 may be configured to extend the movement range of the counter weight 410 to a position outside the width of the forklift. That is, the counter weight 410 may be moved to a point outside the outer ends of both crawlers 120 located on both sides of the body frame 110, and the counter weight 410 completely deviates from the crawler 120, or Only a portion of the can be moved to leave the crawler 120. This is to enable the left and right balance adjustment in response to the case where the moving position of the fork part 320 is out of the total vehicle width (width of both crawlers) of the forklift.

In addition, the balance control unit 400 may be configured to have two movement guide plates, each of which has a counter weight on each movement guide plate, and an additional movement unit for moving them to both sides, respectively.

The balance control operation of the forklift according to the present invention as described above will be described.

The operator can step on the footrest 112 and climb, and in this state, the operator drives the forklift through the operation unit on the upper surface of the main body 130 and operates the fork unit 320.

That is, in the case of transporting cargo using the fork part 320, the fork part 320 moves the forklift while pulling the moving plate 210 forward by operating the cylinder 140 of the vehicle body frame 110. Into the bottom of the cargo.

At this time, in a general work environment, the work is performed in a situation where the path of the forklift is secured, but in the agricultural environment in which the agricultural forklift of the present invention is used, the path of the forklift cannot be secured due to a hill or a separate structure, Situations can arise that are not approached correctly.

In other words, as shown in FIG. 5, in an agricultural environment, due to topographic restrictions such as other loads 20 or hills around the cargo 10, the forklift may not approach the cargo 10 in the forward direction In this case, the fork part 320 is moved to the left or right through the side shift unit 330 and approaches the cargo 10, so that the fork part 320 is off the center of the forklift. 10) to be able to perform the lifting work.

That is, in FIG. 5A, the operator moves and moves the forklift near the cargo 10 to be transported. In addition, as shown in FIG. 5B, the fork part 320 is moved to the left through the side shift unit 330. Thereafter, as shown in FIG. 5C, the forklift is driven to the front side to enter the fork part 320 under the cargo 10. Thereafter, the cargo is lifted by lifting the fork portion 320 entering the bottom surface of the cargo.

When lifting the cargo in this state, the position of the fork part 320 moved by the side shift unit 330 is deviated from the center of gravity of the forklift by the moving distance, and if the cargo is heavy, its weight according to the weight Since the amount of movement of the center becomes larger, and the center of gravity is shifted to one side, there is a risk of the forklift being overturned in the direction in which the fork part 320 is moved.

Accordingly, the forklift according to the present invention moves the counter weight 410 in the opposite direction to the movement of the fork unit 320 through the balance control unit 400 to compensate for the changed center of gravity.

That is, as shown in FIG. 5D, when the fork part 320 is positioned to the left, the weight moving unit 401 is moved to the right so that the counter weight 410 is positioned on the right side of the forklift. In addition, when the cargo 10 is located on the right side of the forklift, the counter weight 410 is moved in the opposite direction so that it is located on the left side of the forklift, so that the balance according to the weight movement of the cargo 10 is adjusted.

In other words, when lifting the cargo, the load of the cargo loaded on the fork portion 320 acts as a pressure on the fork portion 320, and the pressure thereof is measured through a pressure gauge (not shown), etc. The input value is input to the controller. In addition, the position of the fork part 320 drawn out to the front of the forklift is also input to the controller.

Then, the controller calculates the position of the fork part 320 and the pressure value acting on the fork part 320 to calculate the torque acting on the left or right side of the front part of the forklift, and in response to this, the reciprocating cylinder 440 Torque acting on the left and right sides of the rear side of the forklift at each position of the counter weight 410 while moving the counter weight 410 to the left or right of the body frame 110 in the direction opposite to the direction in which the fork part 320 was moved By calculating, the counter weight 410 is stopped at a position where both torques match.

Accordingly, the same torque is applied to the left and right sides of the forklift as described above, so that the left and right balance of the forklift is adjusted accordingly, thereby maintaining the center of gravity of the forklift constant.

On the other hand, the forklift of the present invention can move the fork part 320 in the front and rear directions by the cylinder 140 of the body frame 110, so that the balance of the forklift in the front and rear directions can be adjusted. . That is, by moving the pulled out fork part 320 to the rear or by moving the pulled in fork part 320 to the front, the torque acting on the front part of the forklift may be adjusted to match the torque of the rear part of the forklift.

That is, even if the forklift of the present invention lifts the cargo with the fork part 320 shifted left and right, the left and right balance can be adjusted, thus minimizing the risk of the forklift overturning, and the front and rear balance can also be adjusted. Therefore, matching the center of gravity of the front, rear, left and right can be made in detailed steps, so that stable balance adjustment is possible.

In addition, in the forklift of the present invention, even if the fork part 320 is moved to a position outside the vehicle width of the forklift, the counter weight 410 may be positioned outside the width of the forklift vehicle in the opposite direction corresponding thereto. That is, if the fork part 320 is moved within the width of the forklift, the balance can be adjusted to correspond to the weight of the cargo 10 through weight adjustment even if the position of the counter weight 410 is located within the width of the forklift. , When the fork part 320 is located outside the vehicle width of the forklift, when the counter weight 410 is located within the vehicle width of the forklift, it is necessary to increase the weight of the weight to balance the actual left and right centers of gravity. Since it is impossible, the left and right balance can be adjusted by moving the counter weight 410 to a position out of the vehicle width in the opposite direction to correspond thereto.

The forklift with the balance adjusted as described above can prevent safety accidents such as overturning in advance and can stably transport cargo.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments posted in the present invention are not intended to limit the technical idea of the present invention, but for explanation, and the scope of the technical idea of the present invention is not limited by these embodiments.

Therefore, the scope of protection of the present invention should be interpreted by the following claims rather than being limited by the above-described embodiments, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

100: body part 110: body frame
120: crawler 130: main body
140: reciprocating cylinder 200: mast unit
210: moving plate 220: outer mast
230: inner mast 240: lifting cylinder
250: chain 310: carriage
320: fork part 400: balance control part
410: counter weight 420: fixed guide plate
430: moving guide plate 440: reciprocating cylinder
450: connection bracket

Claims (5)

A vehicle body frame that is provided with crawlers on both sides and capable of running;
A mast unit provided on the vehicle body frame and operated by a lifting cylinder;
A carriage coupled to the mast unit and provided to elevate;
A side shift unit having a shift frame sliding in the carriage and a shift cylinder moving the shift frame with respect to the carriage; And
It includes a fork portion having a pair of fork feet mounted on the carriage through the side shift unit to lift the cargo,
A forklift having a balance control unit that maintains a balance of the vehicle body by moving a counter weight so as to correspond to the center of gravity of the forklift that is moved according to a position change of the fork unit on the vehicle body frame.
The method according to claim 1,
The fork part is moved in the left and right directions in the carriage by the side shift unit,
The balance control unit includes a counter weight, which is a weight, and a weight moving unit for moving the counter weight, and moves the counter weight in a direction relative to the moving direction of the fork unit.
The method according to claim 1,
The balance control unit is a forklift that can move the counter weight to a position outside the outer side of both crawlers.
The method according to claim 2,
The weight transfer unit,
A fixing guide plate installed on the vehicle body frame and having a rail groove formed on an upper surface thereof;
A moving guide plate that is movably coupled to the fixed guide plate by forming a rail protrusion fitted into the rail groove; And
A forklift including a reciprocating cylinder that moves the moving guide plate in both directions.
The method of claim 4,
The reciprocating cylinder may be provided as a two-way cylinder that moves in both directions by fixing both ends of the piston rod to the body frame.
A forklift further provided with a connecting bracket for connecting the reciprocating cylinder to the moving guide plate.

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