JP2000302372A - Concrete bucket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To open and close a gate by a gate opening and closing means by connecting a hydraulic cylinder to the gate, and controlling a servomotor of an integrated hydraulic actuator unit capable of driving a discharge pump in the forward and backward directions by connecting the two-way discharge pump for supplying the hydraulic fluid to the hydraulic cylinder. SOLUTION: A gate 4 is supported on a bucket body 1 rotatably through a shaft 7, and the fan-shaped connection gears 8 mounted on the shaft are engaged with each other to be mechanically synchronized with each other. A plunger 10 projecting from a hydraulic actuator unit 9 is connected to an opening and closing end positioned on a lower outside of the gate 4. The unit 9 is held in a casing 15 supported on a bracket 11 fixed to an outer surface of the bucket body 1, oscillatably through a shaft 14, and the plunger 10 is moved forward and backward through a hydraulic mechanism only by the motive power of a motor to open and close the gate 4. Therefore, a piping and a valve in a hydraulic driving system for opening and closing the gate can be omitted, and a compact concrete bucket capable of being driven only by a battery power source can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mechanism for hydraulically opening and closing a concrete bucket used for, for example, dam construction, and more particularly to a gate thereof.

[0002]

2. Description of the Related Art At a dam construction site, there is a concrete bucket as a means for transporting concrete from a manufacturing site to a casting site. This concrete bucket
It reciprocates between a bunker line provided on the mountain side suspended by a cable crane and a concrete hopper arranged at the bottom of the dam, and concrete supplied on the bunker line is sequentially delivered to the hopper side.

As the gate opening / closing mechanism of the concrete bucket, a hydraulic cylinder and hydraulic equipment and control equipment related thereto are generally used. However, in order to complete the opening / closing control function using this mechanism, a power unit for driving the cylinder must be mounted, and this power unit must be connected to the gate opening / closing cylinder by piping. In addition, maintenance work such as refueling of the tank was also troublesome.

In this respect, for example, Japanese Patent Laid-Open No.
No. 5,693,693 discloses a method in which the tension is applied to a suspending member when a bucket is lifted, that is, the self-weight of the bucket is converted into a hydraulic pressure, and the hydraulic pressure is stored in an accumulator. A mechanism for driving an opening / closing cylinder is disclosed.

[0005] There is also a structure in which a hydraulic cylinder for opening and closing a gate is driven by opening and closing a hydraulic pipe of the hydraulic oil accumulated through an air tank as a drive source by a switching valve to open and close the gate.

[0006]

However, even in these structures, it is necessary to accumulate the pressure again when the pressure is reduced. In practice, only one to three or four opening / closing operations can be performed with one accumulation of pressure. Therefore, there is a problem that the pressure accumulating operation must be performed frequently, which takes time and effort. In addition, there were questions about the structural complexity and operational stability, such as the need for an air supply source and the need for a mechanical balance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a new and compact electric drive system which can omit piping and valves in a hydraulic drive system and is compact and can be electrically driven only by a battery power supply. It is intended to provide a useful concrete bucket.

[0008]

In order to achieve the above object, the present invention relates to a gate provided at the bottom of a bucket so as to be openable and closable, and a concrete bucket provided with the gate opening and closing means. An integrated hydraulic actuator unit including a hydraulic cylinder connected to the gate, a bidirectional discharge pump connected to the hydraulic cylinder to supply hydraulic oil, and a servomotor for driving the discharge pump to rotate forward and reverse; Control means for controlling the servomotor of the integrated hydraulic actuator unit.

As described above, according to the present invention, since the hydraulic drive system is constituted by a unit in which the hydraulic cylinder, the discharge pump and the servomotor are integrated, the system is compact and does not require piping or valves. It is possible to open and close the gate by driving the hydraulic drive system only by the control operation.

[0010]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Figure 1
2 shows a concrete bucket according to the present invention, and FIG.
Shows details of a hydraulic actuator unit used for opening and closing the gate of the bucket.

In the drawing, a concrete bucket has a bucket body 1 having an upper part formed in a cylindrical shape and a lower part formed in a funnel shape, and brackets 2 on both sides of the upper part of the bucket body 1.
A pair of pendant ropes 3 attached to the suspension beam (not shown), a pair of gates 4 for opening and closing the lower opening of the bucket body 1, and a ring-shaped frame 5 arranged around the gates 4. An upper end is fixed to the upper part of the bucket body 1, and an upper and lower connecting plate 6 is connected to the lower end of the bucket 5 and supports the frame 5.

Each of the gates 4 is rotatably supported on the outer periphery of the lower portion of the bucket body 1 via a shaft 7 and meshes with a sector-shaped connecting gear 8 provided around each shaft. Mechanical synchronization has been achieved.

A plunger 10 protruding from the hydraulic actuator unit 9 is connected to an open / close end located outside the lower part of each gate 4. The unit 9 is provided with a shaft 1 on a bracket 11 fixed to the outer surface of the bucket body 1.
The plunger 10 is held in a casing 15 which is swingably supported through the plunger 4, and the plunger 10 is moved forward and backward through the hydraulic mechanism only by the motor power to open and close the gate 4.

Therefore, other than the above-mentioned unit 9, on the frame 5, around the bucket body 1, a battery 16 serving as a power supply for driving the motor and the relay 1 for remote control are provided.
7 and the like are simply arranged.

The unit 9 includes, as shown in FIG.
A hydraulic cylinder 18 having the plunger 10 protruded and retractable, and a bidirectional discharge pump 19 which is integrated in parallel with the hydraulic cylinder 18 and supplies and discharges hydraulic oil into and from the cylinder 18.
And a servomotor 20 connected to a drive shaft of a pump 19.
And a closed circulation oil pan 21 integrally connected to the tip of the pump 19.

FIG. 3 (b) shows a hydraulic circuit of the unit 9. The plunger 10 is connected to a stop valve 22 for adjusting the amount of oil provided on an oil pan 21 via a connecting rod 23. With this rise, the stop valve 22 is opened to circulate through the intermediate filling section 24 to the pump 19 side.

The motor 20 is driven and controlled by a command signal from a level control device 25. The control device 25 has a rotary encoder 26 for detecting the rotation and the direction of the motor 20, and a protrusion for the plunger 10 respectively. The linear sensor 27 and the level sensor 28 disposed in the intermediate filling section 24 are connected to each other. Based on the detection state of these sensors, the protruding direction and the protruding amount of the plunger 10 are detected, and the motor 20 is driven by an external drive command signal. The rotation of the cylinder 18 is controlled in accordance with the discharge direction and the discharge amount of the pump based on this.
To open and close the gate 4 connected to the tip of this.

The external signal to the control device 25 is
It can also be generated by remote control by a wireless device, or by detecting a state of being seated or separated from a bucket or a hopper.

[0019]

As is apparent from the above description, in the concrete bucket according to the present invention, piping and valves in the hydraulic drive system for opening and closing the gate can be omitted as compared with the prior art, and the concrete bucket is compact and requires only the battery power supply. Can be driven. In addition, since the pump can be driven only by operating the pump during operation, there is an advantage that energy efficiency is high.

[Brief description of the drawings]

FIG. 1 is a side view of a concrete bucket according to the present invention.

FIG. 2 is a side view from the position of arrow A in FIG. 1;

FIG. 3A is an external view of a hydraulic actuator unit. (B) is the same hydraulic circuit diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete bucket main body 4 Gate 9 Hydraulic actuator unit 10 Plunger 18 Hydraulic cylinder 19 Bidirectional discharge pump 20 Servo motor 25 Level control device

Claims (1)

[Claims] 1. A concrete bucket having a gate provided at the bottom of a bucket so as to be openable and closable, and a means for opening and closing the gate, wherein the gate opening and closing means is connected to a hydraulic cylinder connected to the gate and to the hydraulic cylinder. An integrated hydraulic actuator unit comprising a bidirectional discharge pump for supplying hydraulic oil that has been driven, a servomotor for driving the discharge pump to rotate forward and reverse, and control means for controlling a servomotor of the integrated hydraulic actuator unit. Concrete bucket characterized by that.