JP2003105712A - Counter weight device for paving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure good body balance and steering performance of a paving machine with a screed device during travel and improve body tractive force during construction. SOLUTION: A counter weight 13 movable forward or backward and a weight driving chain 19, sprockets 17, 18 and a hydraulic motor for moving the counter weight are arranged in a space inside a feeder conveyor 5. The counter weight can be moved forward or backward to be set at the gravity center position adequate for travel or construction working conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a counterweight device in a paving machine such as an asphalt finisher.

[0002]

2. Description of the Related Art Generally, in a paving machine such as an asphalt finisher, a screed device for laying a paving material is towed behind a traveling machine body.
At the time of construction, the ground is touched on the pavement surface and the weight is received by the pavement surface, while at the time of traveling (traveling without construction), it is supported by the traveling machine body in a suspended state. In other words, the traveling machine bears the weight of the screed device during traveling, and therefore the center of gravity of the paving machine during traveling is at the rear of the machine. However, if the center of gravity is too far behind, Perhaps it is unbalanced, but when the traveling device of the paving machine is of the wheel type, the axle weight of the front wheels, which are the steered wheels, becomes insufficient. Therefore, conventionally, a counterweight is provided at the front part of the traveling machine body so that the machine body can be balanced during traveling by the counterweight and a necessary front wheel axle weight can be secured.

[0003]

In the paving machine, as described above, since the weight of the screed device is received on the paving surface during construction, the center of gravity of the paving machine moves to the front, and therefore, during construction. The axle load of the rear wheel at is lower than that during traveling. However, in a paving machine such as an asphalt finisher, since the rear wheels carry more than half of the traction force, a reduction in the rear wheel axle load leads to a reduction in the traction force of the entire vehicle. Therefore, in order to improve the traction force, the rear wheel axle weight may be increased, that is, the center of gravity may be located as rearward as possible, but in this case, the above-mentioned counterweight provided in the front part of the machine body becomes an obstacle.
That is, there is a problem that the counterweight provided so as to be preferable during traveling causes a reduction in traction force during construction, and there is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems, and is a screed device for laying a paving material on a traveling machine body. In the paving machine towed, the traveling machine body is provided with counterweights so as to be movable in the front-rear direction, and weight movement means for moving the counterweights. By doing so, the counterweight can be moved back and forth, and the machine body center of gravity position can be set to a position suitable for each working state such as running and construction, and the machine body can be stabilized during running. While it can contribute to the improvement of
It can contribute to the improvement of the traction force of the aircraft during construction. In this thing, the counterweight, in the inner space portion of the conveyor that conveys the paving material from the front side of the traveling machine body to the rear side,
By arranging them in such a manner that they can move back and forth, it does not interfere with the operation of other member devices, and there is no need to separately secure a moving space for the counterweight. Further, the weight moving means can be configured to include, for example, a carrier body integrally attached to the counterweight and an actuator for moving the carrier body. further,
The weight moving means can move the counterweight based on the operator's intention by activating the weight to move the counterweight back and forth based on a signal from the operating means that the operator arbitrarily operates. Furthermore, the weight moving means is configured to operate so as to move the counterweight in the front-rear direction on the basis of a signal from the work state judging means capable of judging the work state of the paving machine, so that it can be used during traveling, construction, etc. The counterweight can be moved according to the working state. In this, the work state determination means is, for example,
It can be constituted by a detection means for detecting the traveling speed of the traveling machine body or a speed operation means for operating the traveling speed.
Further, the work state judging means may be constituted by a driving means or an operating means of the hoisting device for hoisting the screed device. Further, in these devices, a signal from the center of gravity position detecting means for detecting the position of the center of gravity of the paving machine is input, and an operation signal is output to the weight moving means for controlling the position of the counterweight based on the input signal. By providing the control device, the movement position of the counterweight can be controlled more accurately. The center-of-gravity position detecting means can be constituted by, for example, an axle load detecting means provided on an axle portion of the traveling machine body.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of an asphalt finisher. The traveling machine body 1 includes a front wheel 2 and a rear wheel 3, a hopper 4 arranged at a front portion of the machine body for receiving an asphalt mixture, and an asphalt received by the hopper 4. Various member devices such as a feeder conveyor 5 for sending the mixed material to the rear of the machine body and a screw spreader (not shown) for spreading the asphalt mixed material sent from the feeder conveyor 5 on the roadbed in the left and right directions are further provided. In the rear of the machine body 1, the screed device 6 for compacting and smoothing the asphalt mixture spread on the roadbed is towed.

The feeder conveyor 5 supports an endless conveyor chain 8 connected to the left and right ends of a plurality of flat bars 7 made of flat steel on a floating sprocket 9 for a conveyor supported on the front of the machine and a rear part of the machine. It is formed by being suspended between the conveyor drive sprockets 10 to be formed, and in the present embodiment, two rows are provided on the left and right. Then, the asphalt mixture fed into the hopper 4 is conveyed to the rear of the machine while being placed on the upper surface of the flat bar 7 located on the upper side, but the conveyor floor supporting the upper flat bar 7 is supported. Space below surface 11,
That is, in the inner space portion of the feeder conveyor 5 formed by the upper and lower flat bars 7 and both sprockets 8 and 9,
A counterweight 13, which will be described later, is provided.

In the present embodiment, a pair of counterweights 13 are provided on the left and right sides, and are arranged in the inner space portions of the left and right feeder conveyors 5, respectively. It is configured to be movable in the front-back direction. That is, in the inner space of the feeder conveyor 5, a plurality of support shafts 14 oriented in the left-right direction are supported between the left and right machine body frames 15 in a state of being aligned in the front-rear direction. And these spindles 14,
A guide roller 16 is rotatably supported, and the counterweight 13 is placed on the guide roller 16.

On the other hand, 17 is a weight floating sprocket, which is arranged on the front side in the inner space of the feeder conveyor 5,
Reference numeral 18 denotes a weight drive sprocket arranged on the rear side in the inner space of the feeder conveyor 5, and one end side of a weight drive chain 19 suspended between these sprockets 17 and 18 has the counter weight 13 of the counter weight 13. The weight drive chain 19 is fixed to the center of the front surface, and the other end of the weight drive chain 19 is fixed to the center of the rear surface of the counterweight 13. Numeral 20 is a hydraulic motor for rotating the weight drive sprocket 18, and the counter weight 13 is rotated by the hydraulic drive motor 20 to rotate the weight drive sprocket 18 in the forward and reverse directions. It is configured to move in the front-back direction on the roller 16.

Here, the counterweight 13 is suitable for a traveling weight position on the front side which is preset as a counterweight position suitable for traveling (traveling in a state where the construction is not performed, the same applies hereinafter). It is configured to move back and forth between a rear-side construction weight position which is preset as a counterweight position. That is, when the asphalt finisher is traveling, the screed device 6 is in a suspended state, and the traveling machine body 1 bears the weight of the screed device 6, so that the center of gravity of the machine body is at the rear. However, if the body weight center position is too rearward, the axle weight of the front wheels 2, which are the steered wheels, may decrease because the body balance may not be maintained during traveling, and the counterweight 13 may be moved forward. By moving it so that the body weight center position suitable for traveling is set, but the counterweight position suitable for the traveling is
Set as the weight position for traveling. On the other hand, when the asphalt pavement is constructed, the screed device 6 is grounded on the pavement surface, and the weight of the screed device 6 is received on the pavement surface. . However, when the body weight center position is in the front, the axial load of the rear wheel 3 is reduced, which leads to a reduction in the traction force of the entire body. Therefore, the counterweight 13 is moved to the rear side so that the machine body-weight position is suitable for the construction. The counterweight position suitable for the construction is set as the construction weight position.

The movement of the counterweight 13 is performed, for example, by operating an operation switch (not shown) of the hoisting cylinder 21 for hoisting the screed device 6 or by driving a hoisting cylinder drive device (not shown). It is done in conjunction. That is, the hoisting cylinder 21 is locked in a contracted state during traveling to hoist the screed device 6, and is also in a free state during construction to be in the free state.
Is lowered by its own weight, and the drive control of the hydraulic motor 20 is performed in conjunction with the operation of the lifting cylinder 21, so that the counterweight 13 is moved to the traveling weight position during traveling, and the construction is performed again. Sometimes it can be automatically positioned at the construction weight position.

Further, the movement of the counterweight 13 is based on a detection signal from a speed sensor (not shown) for detecting the traveling speed, or a high speed / low speed switching switch for switching the traveling speed between the high speed side and the low speed side. (Not shown) can also be configured to be performed in conjunction with the operation. That is, the traveling speed of the asphalt finisher becomes high during traveling and becomes low during construction, but by controlling the drive of the hydraulic motor 20 in conjunction with the traveling speed, the counterweight 13 travels during traveling. It can be automatically positioned at the work weight position or at the construction weight position during construction.

Further, the movement of the counterweight 13 is
It can also be configured to be performed based on an operation of a weight movement operation switch (not shown, provided on the operation panel 12, for example) operated by an operator. That is,
The above-described structure in which the counterweight 13 is moved in association with the operation of the lifting cylinder 21 or the traveling speed of the lifting cylinder 21 determines the operation and the traveling speed of the lifting cylinder 21 regardless of whether the asphalt finisher is running or working. It is used as a work state determination means for determining whether or not the movement is satisfied, and movement control of the counterweight 13 is automatically performed based on a signal from the work state determination means.
In addition to such automatic movement, the operator arbitrarily operates the weight movement operation switch to control the drive of the hydraulic motor 20 in response to traveling or construction, thereby causing the counterweight 13 to move during traveling. It may be located at the traveling weight position or at the construction weight position during construction. This can be arranged in parallel with the above-mentioned counterweight 13 which is automatically moved. In this case, the operator operates the weight movement operation switch with priority. Is desirable. Further, in the configuration in which the counterweight 13 is automatically moved, a weight lock switch (not shown) for avoiding the automatic movement of the counterweight 13 when unnecessary may be provided.

In the structure constructed as described above, the counterweight 13 is arranged in the inner space of the feeder conveyor 5 so as to be movable back and forth, and the work such as the operation of the lifting cylinder 21 and the traveling speed is performed. Based on the signal from the state determination means, the operation of the weight movement operation switch, etc., it is possible to move back and forth between the running weight position which is the body-weight center position suitable for traveling and the construction weight position which is the machine-weight center position suitable for construction. Will move. As a result, even when the traveling machine body 1 bears the weight of the screed device 6 during traveling, the counterweight 13
As a result, the center of gravity of the machine body can be set to an appropriate position suitable for traveling, and thus a good machine body balance can be maintained during traveling, and the axial load required for the front wheels 2 serving as steering wheels can be secured. On the other hand, at the time of construction, the screed device 6
Even if the weight of the vehicle is received on the pavement surface, the counterweight 13 can set the machine-weight center position to an appropriate position suitable for construction, and thus the axial load of the rear wheel 3 can be increased. The traction force of the aircraft can be improved. Moreover, in this one, the counterweight 1
Since 3 is arranged in the inner space of the feeder conveyor 5, it does not interfere with the operation of other mechanical devices provided in the asphalt finisher, and it is not necessary to separately secure a moving space for the counterweight 13, convenient.

The present invention is not limited to the above-mentioned embodiment, and as the weight moving means for moving the counter weight, an electric type such as an electric motor can be used, and the hydraulic pressure can be used. The counterweight can also be configured to be moved by a telescopic cylinder such as a cylinder or an electric cylinder. Further, the connection between the counter weight and the weight moving means may be via a carrier such as a chain as in the above-mentioned embodiment, but may be directly connected. Further, when the movement of the counterweight is controlled, as shown in the block diagram of FIG. 4, a controller (control device) 22 may be used. That is, in FIG. 4, reference numeral 23 is a work state judging means, and the work state judging means 23
Is configured by means such as the above-described drive device or operation switch of the lifting cylinder 21, a traveling speed sensor, a high speed / low speed switch, and the like that can determine whether the asphalt finisher is in a working state of traveling or construction.
Further, 24 is a barycentric position detecting means, and the barycentric position detecting means 24 is, for example, a load cell provided on the axles of the front and rear wheels 2 and 3 by a detecting means used for determining the barycentric position of the asphalt finisher. Composed,
The work state determining means 23 and the center of gravity position detecting means 2
The detection signal No. 4 is input to the controller 22.
Then, the controller 22 firstly detects the gravity position detecting means 2
Based on the input signal from 4, the body weight center position calculation unit 25 calculates the body weight center position. Further controller 2
2 is a weight position calculation unit 26 based on the calculated body weight center position and an input signal from the work state determination means 23.
At, the optimum position of the counterweight 13 is calculated. In this case, the optimum position of the counterweight 13 is not a preset position such as the traveling weight position and the construction weight position described above, but may be an optimal body weight center position during traveling and construction. The position.
Then, the controller 22 outputs an operation signal to the weight moving means 27 so that the counter weight 13 is located at the optimum position. By doing so, the position control of the counterweight 13 can be performed more accurately.

[Brief description of drawings]

FIG. 1 is a side view of an asphalt finisher.

FIG. 2 is a side view of a main part.

FIG. 3 is a rear view of the main part.

FIG. 4 is a movement control block diagram of a counterweight.

[Explanation of symbols]

1 traveling aircraft 5 feeder conveyor 6 screed device 13 counterweight 16 Guide roller 19 Weight drive chain 20 hydraulic motor 21 Lifting cylinder 22 Controller 23 Work status determination means 24 Weight position detection means 27 Weight transfer means

Claims (9)

[Claims] 1. A paving machine comprising a traveling machine body and a screed device for laying a paving material on the traveling machine body. The traveling machine body is provided with counterweights so as to be movable in the front-rear direction, and the counterweights are moved. A counterweight device in a paving machine, characterized in that a weight moving means is provided. 2. The counterweight according to claim 1, wherein the counterweight is arranged in a front-rear movable state in an inner space portion of a conveyor that conveys paving material from a front side to a rear side of the traveling machine body. Counterweight device for paving machines. 3. The paving machine according to claim 1 or 2, wherein the weight moving means comprises a carrier integrally attached to the counterweight, and an actuator for moving the carrier. Counterweight device in. 4. The paving machine according to claim 1, 2 or 3, wherein the weight moving means operates so as to move the counterweight back and forth based on a signal from an operating means arbitrarily operated by an operator. Counterweight device. 5. The weight moving means according to claim 1, 2, 3 or 4 operates to move the counterweight in the front-rear direction based on a signal from a work state judging means capable of judging the work state of the paving machine. A counterweight device in a paving machine characterized by the above. 6. The counterweight device for a paving machine according to claim 5, wherein the work state determining means is a detecting means for detecting a traveling speed of the traveling machine body or a speed operating means for operating the traveling speed. 7. The counterweight device in a paving machine according to claim 5, wherein the working state determining means is a driving means or an operating means of a hoisting device for hoisting the screed device. 8. A method according to claim 1, 2, 3, 4, 5, 6 or 7.
In the above, there is provided a control device for inputting a signal from the center of gravity position detecting means for detecting the position of the center of gravity of the paving machine, and outputting an operation signal to the weight moving means for controlling the position of the counterweight based on the input signal. A counterweight device in a paving machine characterized by the above. 9. The counterweight device for a paving machine according to claim 8, wherein the center-of-gravity position detecting means is an axial load detecting means provided on an axle portion of the traveling machine body.