JP3676998B2 - Hopper opening and closing device for paving machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hopper opening / closing device for a paving machine, and more particularly, to a hopper opening / closing device for a paving machine that can smoothly transport received asphalt mixture backward.
[0002]
[Prior art]
This conventional pavement machine has a hopper device for receiving asphalt mixture at the front part of the machine body, a conveyor device for conveying the asphalt mixture material received by the hopper apparatus to a screw device at the rear part of the machine body, and towing the machine to the rear. And a screed device for spreading and leveling asphalt mixture. The conveyor device is disposed on the bottom surface portion of the hopper device, the side surface portion of the hopper device is connected to the machine body by a hinge, and an actuator such as a hydraulic cylinder is mounted on the outside of the hopper side surface portion. Accordingly, the hopper side surface is rotated about the hinge as a fulcrum by the operation of the actuator, and can be opened and closed.
[0003]
The asphalt mixture that was originally received in the conveyor part was transported to the rear of the machine by the conveyor, and when the asphalt mixture in the conveyor part decreased, the asphalt mixture that was received in the hopper side part was closed by closing the hopper side part. To the conveyor.
[0004]
[Problems to be solved by the invention]
Due to the changes in pavement specifications, drainage pavement has become the mainstream in recent years. This is because the high-viscosity modified asphalt is used as a binder, so it is highly sticky, and when the asphalt mixture received in the hopper is put into the conveyor device, the asphalt mixture does not fall easily even if the hopper is closed. . Therefore, asphalt mixture tends to remain on the side surface of the hopper. If the asphalt mixture remaining in the hopper is left unattended, the asphalt mixture is cooled and fixed in the hopper. For this reason, an operator has entered the hopper, and the asphalt mixture has to be scraped off manually, which is dangerous.
[0005]
Therefore, when the asphalt mixture received in the hopper is thrown into the conveyor device, a technical problem to be solved arises so that the asphalt mixture can be easily dropped and transported backward. The present invention aims to solve this problem.
[0006]
[Means for Solving the Problems]
The present invention has been proposed to achieve the above object, and includes a hopper device that receives asphalt composite material, a conveyor device that transports the asphalt composite material received in the hopper device to a screw device at the rear of the machine body, In a paving machine that is composed of a screed device that is pulled rearward and spreads and leveles asphalt mixture, the conveyor device is arranged on the bottom surface of the hopper device, and the side surface of the hopper is freely opened and closed by an actuator. A hopper opening and closing device for a paving machine, comprising an intermittent device for intermittently operating the actuator, and configured to operate the intermittent device during a closing operation of the hopper side surface portion,
And the intermittent device includes means for detecting closing of the hopper side face, means for selecting opening / closing operation of the hopper side face, and a hopper side face closing operation signal of the actuator when the closing of the hopper side face is detected. The present invention provides a hopper opening / closing device for a paving machine provided with a timer for intermittently turning on and off.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an asphalt finisher 10 as an example of a paving machine. The asphalt finisher 10 is provided with a hopper device 11 for receiving asphalt mixture at the front portion of the machine body, and the asphalt mixture material received at the hopper device 11 is a screw at the rear part of the machine body. Consists of a conveyor device 13 transported to the device 12 and a screed device 14 that is pulled to the rear of the machine body and spreads the asphalt mixture.
[0008]
FIG. 2 shows the hopper device 11, and the hopper 15 is composed of left and right bottom surface portions 15a and 15a and left and right side surface portions 15b and 15b, and a conveyor device 13 is arranged in the center of the bottom surface portion 15a. The side surfaces 15b and 15b are connected to the machine body by a hinge, and an actuator such as a hydraulic cylinder 16 is mounted on the outside of the hopper side surface 15b. The hopper side surface portion 15b rotates about the hinge as the hydraulic cylinder 16 expands and contracts, and the hopper side surface portion 15b can be freely opened and closed.
[0009]
Here, when an asphalt mixture with high adhesiveness is received from the dump truck to the hopper 15, the asphalt mixture has a high viscosity and is likely to adhere to the hopper 15. Therefore, when the hopper side surface portion 15b is closed by the extension of the hydraulic cylinder 16, the asphalt mixture is difficult to leave the hopper side surface portion 15b and easily remains. In the present invention, an intermittent device 17 that intermittently operates the hydraulic cylinder 16 that is an actuator is provided, and as described later, the operation of the hopper side surface portion 15b is controlled by operating the intermittent device 17, The asphalt mixture is easily separated from the hopper side surface portion 15b.
[0010]
FIG. 3 shows a hydraulic circuit. Pressure oil discharged from a hydraulic pump 18 is supplied to the left and right hydraulic cylinders 16 and 16 under the control of an electromagnetic directional control valve 19. The electromagnetic directional control valve 19 is provided with a raising solenoid 20 and a lowering solenoid 21, and when both solenoids 20, 21 are not excited, the electromagnetic directional control valve 19 maintains a neutral position a as shown in the figure. Thus, no pressure oil is supplied to the hydraulic cylinder 16. Therefore, the hopper side plate 15b does not move while maintaining the current angle.
[0011]
If the raising solenoid 20 is excited now, the electromagnetic directional control valve 19 is switched to the raising position B, and the hydraulic oil of the hydraulic pump 18 is supplied to the bottom side 16a of the hydraulic cylinder 16. Accordingly, the hydraulic cylinder 16 is extended, and the hopper side surface portion 15b shown in FIG. 2 is rotated upward, and the hopper closing operation is performed. On the other hand, if the lowering solenoid 21 is excited, the electromagnetic directional control valve 19 is switched to the lowering position C, and the hydraulic oil of the hydraulic pump 18 is supplied to the top side 16b of the hydraulic cylinder 16. Accordingly, the hydraulic cylinder 16 contracts, and the hopper side surface portion 15b rotates downward, and the hopper opening operation is performed.
[0012]
FIG. 4 shows an electric circuit of the intermittent device 17. The intermittent device 17 is a means for selecting the opening / closing operation of the limit switch 32 and the relay 22, which are means for detecting the closing of the hopper side face 15b, and the hopper side face 15b. A toggle switch 23 and a timer 24 for intermittently operating a closing operation signal for the hopper side surface portion 15b when the closing of the hopper side surface portion 15b is detected, and in parallel with the limit switch 32 and the relay 22, A toggle switch 23 and A contacts 25 and 26 of the timer 24 are provided.
[0013]
The timer 24 is connected to a contact 23 a of the toggle switch 23, and an A contact 27 of the relay 22 is provided in series with the timer 24. On the other hand, the B contact 28 of the relay 22 is connected to the contact 23 c of the toggle switch 23, and the raising solenoid 20 is connected in series with the B contact 28 of the relay 22. The lower solenoid 21 is connected to the contact 23 d of the toggle switch 23.
[0014]
The toggle switch 23 is a two-pole double-throw momentary system, and the movable portion is interlocked. When the hopper side surface portion 15b is operated to close, the contacts 23a and 23c are simultaneously turned on. On the other hand, when opening the hopper side surface portion 15b, the contacts 23b and 23d are simultaneously turned on. A diode 29 is provided in series with the A contact 25 of the timer 24 and connected between the B contact 28 of the relay 22 and the raising solenoid 20. A diode 30 is provided in series with the A contact 26 of the timer 24. Then, a connection is made between the contact 23 d of the toggle switch 23 and the lowering solenoid 21. Reference numeral 31 denotes a fuse.
[0015]
Thus, when the hopper side surface portion 15b is closed by the toggle switch 23, the contacts 23a and 23c are turned on. In this state, since the A contact 27 of the relay 22 is open, electricity does not flow to the timer 24, and the A contacts 25 and 26 of the timer are open. If the limit switch 32 and the relay 22 are not activated, the B contact 28 of the relay 22 is closed. Therefore, the operation signal is sent from the contact 23 c of the toggle switch 23 to the raising solenoid 20 via the B contact 28 of the relay 22. Is output, and the hopper side face portion 15b starts the closing operation.
[0016]
When the hopper side surface portion 15b continues the closing operation to reach the most closed position, the limit switch 32 and the relay 22 are activated by detecting the closing of the hopper side surface portion 15b. At that time, the A contact 27 of the relay 22 is closed and the B contact 28 of the relay 22 is opened. Accordingly, the timer 24 is energized from the contact 23a of the toggle switch 23, and the timer 24 is activated.
[0017]
At that time, the timer A contacts 25 and 26 are alternately closed, and an operation signal is alternately output to the raising solenoid 20 and the lowering solenoid 21 (flicker operation). That is, when the hopper side surface portion 15b is in the most closed position, the hydraulic cylinder 16 repeats a fine expansion and contraction operation, and the hopper side surface portion 15b is inched. Therefore, the asphalt mixture adhering to the hopper side surface portion 15 b is detached and falls onto the conveyor device 13.
[0018]
It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.
[0019]
【The invention's effect】
As described in detail in the above embodiment, the invention according to claim 1 includes an intermittent device that intermittently operates an actuator in a hopper device that receives asphalt mixture, and when the hopper side surface is closed. Since the intermittent device is configured to operate, the hopper side surface closing operation is intermittently performed, and the asphalt mixture is easily separated from the hopper when the hopper is closed and the asphalt mixture is put into the conveyor device. It falls very easily.
[0020]
As a result, the asphalt mixture does not remain in the hopper and does not stick after cooling, and the operator does not need to manually enter the hopper and scrape off the asphalt mixture manually. In addition to saving manpower and labor, dangerous work is eliminated, contributing to improved safety. Further, since the cooled asphalt mixture does not remain in the hopper, the waste of the asphalt mixture is not processed, and the waste of the material is eliminated, and environmental pollution can be prevented.
[0021]
According to a second aspect of the present invention, when the intermittent device detects the closing of the hopper side surface, the means for selecting the opening / closing operation of the hopper side surface, and the closing of the hopper side surface, And a timer for interrupting the operation signal. Therefore, in addition to the effect of the first aspect of the invention, by electrically configuring the intermittent device, the device can be simplified and the machine can be reduced in size.
[Brief description of the drawings]
The figure shows an embodiment of the present invention.
FIG. 1 is a side view of an asphalt finisher. FIG. 2 is a front view of an asphalt finisher (hopper device).
FIG. 3 is a hydraulic circuit diagram.
FIG. 4 is an electric circuit diagram of the intermittent device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Asphalt finisher 11 Hopper device 12 Screw device 13 Conveyor device 14 Screed device 15 Hopper 15a Bottom surface portion 15b Side surface portion 16 Hydraulic cylinder 17 Intermittent device 18 Hydraulic pump 19 Electromagnetic direction control valve 20 Lifting solenoid 21 Lowering solenoid 22 Relay 23 Toggle switch 24 Timer 25, 26 Timer A contact 27 Relay A contact 28 Relay B contact 29, 30 Diode 31 Fuse 32 Limit switch

Claims (2)

Consists of a hopper device that receives asphalt composite material, a conveyor device that conveys the asphalt composite material received in the hopper device to a screw device at the rear of the machine body, and a screed device that is pulled behind the machine body and spreads the asphalt composite material In the pavement machine in which the conveyor device is disposed on the bottom surface of the hopper device and the side surface of the hopper is formed to be openable and closable by an actuator, the hopper includes an intermittent device for intermittently operating the actuator. A hopper opening / closing device for a paving machine, wherein the intermittent device is activated during a side surface closing operation. The intermittent device includes means for detecting closing of the hopper side surface, means for selecting an opening / closing operation of the hopper side surface, and intermittently receiving a hopper side surface closing operation signal of the actuator when the hopper side surface closing is detected. The hopper opening and closing device for a paving machine according to claim 1, further comprising a timer to be operated.

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