JPH09328900A - Running-speed display mechanism in concrete pump car with copying operating device - Google Patents

Abstract

PURPOSE: To display the operating capability of a concrete pump car sufficiently by installing a pressure switch mounted on the pump car and an indicator emitting light by an output signal from a sensing switch for a relief valve to a control box respectively. CONSTITUTION: In a model arm 19, corresponding sections in a main body arm 2 are contracted and formed beforehand at the same ratio. Hydraulic cylinders 11, 12, 13 are operated through a control mechanism 35 so that the detecting angles of each corresponding angle detector in the main body arm 2 are equalized on the basis of signals from the angle detectors annexed to each joint 24, 25, 26 respectively. A pressure switch is installed near a third hydraulic cylinder for a concrete pump car A, and a sensing switch is mounted beforehand to a relief valve, in which excess oil is flowed back. On the other hand, an indicator emitting light, etc., while being interlocked with an output signal from the pressure switch and an indicator emitting light, etc., while being interlocked with an output signal from the sensing switch are fitted beforehand to a control box. Accordingly, whether running speed is proper or not can be determined easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pump vehicle equipped with a copying operation device, and to an improvement for informing a driver of an appropriate operating speed during copying operation.

[0002]

2. Description of the Related Art Generally, a concrete pumping apparatus has a plurality of joints which support a conduit for guiding fresh concrete pumped from the pump by arms which can be bent along a plane to control the operation of a hydraulic cylinder provided at each joint. Thus, the tip of the conduit is moved to a desired position, and it is often mounted on an automobile and used as a concrete pump truck.

Conventionally, in order to operate an arm of a concrete pump car of this type, pedals and levers are operated to individually actuate hydraulic cylinders provided at respective joints, and the combination of the actuations causes the tip portion of the conduit (concrete (Discharge port)
Is moved to a desired position, but the trajectory drawn by the tip of the conduit is a combination of arcuate motions with each joint of the arm as a fulcrum, so extremely high skill is required for its operation. To be done.

Therefore, an arm control device (copying drive device) capable of easily operating the arm of such a concrete pump car has been previously proposed by the present applicant as Japanese Patent Laid-Open No. 61-17668. Has been done. The device forms an arm controller with a model arm of a similar shape to the main body arm of a concrete pump car, and with an angle detector at each joint of both arms,
The operation of each hydraulic cylinder is controlled so that the angle detected by the angle detector of the main body arm becomes equal to the angle detected by the angle detector of the model arm.Hold the tip of the model arm by hand. It is provided so that the main body arm of the concrete pump car can be moved in the same way by moving it, and complex operation of the main body arm can be easily performed.

[0005]

However, the body arm of the concrete pump car, in which the arm members connected to each other by the respective joints are respectively actuated by the hydraulic cylinders of the respective joints, is essentially the same as the arm members constituting the same arm. While observing the movement, operating the pedals and levers to operate one or two of each hydraulic cylinder to operate, while operating the model arm of the arm controller as described above. When operating the arm of a concrete pump car, the hydraulic cylinders often operate simultaneously, especially when the arm controller is operated suddenly. However, there is a problem in that the hydraulic pressure drops and the power becomes insufficient, resulting in inaccurate operation of the body arm. On the other hand, if the model arm is operated slowly, excess oil will flow back to the oil tank via the oil relief valve (hydraulic pressure adjustment valve) provided between the oil pump and the hydraulic cylinder. However, there is a problem that the working capacity commensurate with the supply amount of can not be fully exerted.

The present invention has been made to improve the above-mentioned problems in order to solve the above problems, and an object of the present invention is to inform a driver of an appropriate operation speed of an arm controller during a copying operation. There is a point to be able to do. That is, according to the present invention, it is possible to detect a decrease in the hydraulic pressure supplied to the hydraulic cylinder during the copying operation and display it by light, sound, etc., while opening the relief valve for returning the oil to the oil tank. The present invention is characterized in that the operation is sensed and can be displayed by light, sound or the like, and its concrete means and action are as follows.

[0007]

[MEANS FOR SOLVING THE PROBLEMS] A switch for detecting the oil pressure in the oil supply line is provided in the oil supply line of a hydraulic cylinder that operates a body arm, and
The arm controller is provided with a display which emits light or sound or light and sound simultaneously based on the output signal of the switch. A switch for detecting the relief operation is installed in the relief valve of the oil supply line of the hydraulic cylinder that operates the main body arm, and an indicator that emits light or sound or light and sound at the same time based on the output signal of the switch is arm-operated. It is installed in the container.

[0008]

When the operating speed of the arm control device is too fast, the switch of the oil supply line detects the decrease in hydraulic pressure and activates the display device to notify the driver by light or sound.
On the contrary, when the operation speed of the arm controller is too slow, the switch detects the opening operation of the relief valve, and the indicator is operated to notify the driver by light or sound.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a drawing showing a concrete pump car A that is provided so as to be operable by an arm controller B described later. A concrete armor body A of the concrete pump car A has a bendable arm (that can be bent along one vertical plane). The main body arm) 2 is mounted. That is, the main body arm 2 is composed of a first arm member 6, a second arm member 7, a third arm member 8 and a fourth arm member 9 which are pivotally connected by three joints 3, 4, 5. , The first arm member 6 is the vehicle body 1
Is supported so as to be rotatable about a vertical axis. Although not shown in the drawings, the respective arm members 6, 4 adjacent to each joint 3, 4, 5
Angle detectors (potentiometers) for detecting the relative angles of 7, 8 and 9 are attached respectively, and the first hydraulic pressure is provided across the joints 3, 4 and 5 between the arm members 6, 7, 8 and 9. A cylinder 11, a second hydraulic cylinder 12, and a third hydraulic cylinder 13 are provided, and the main body arm 2 is formed so as to be bent and deformed by the expansion and contraction operation thereof. A conduit 15 that guides ready-mixed concrete pumped from a pump 14 is supported on the main body arm 2, and a hopper 16 is provided by the conduit 15.
The ready-mixed concrete is supplied so that it can be poured from the flexible hose 17 at the tip thereof into the concrete pouring place.

FIG. 2 is a view showing a wireless type arm controller B, in which the model arm 19 is arranged on the upper surface of the operation box 18, and the model arm 19 is the concrete pump. The portions corresponding to the body arm 2 of the vehicle A are formed in a similar shape in which the same proportions are reduced. That is, the model arm 19 includes the first model arm member 20, the second model arm member 21, and the third model arm member 2.
2, the fourth model arm member 23 has three joints 24, 25,
It is rotatably pivoted by 26 and is provided so as to be manually operable in an arbitrary bent state within a bendable range of the main body arm 2. Further, the first model arm member 20 is pivotably provided by a bearing portion 27 provided on the upper surface of the operation box 18, while a model hose 28 is attached to the tip end portion of the fourth model arm member 23. Each joint 24,
Although not shown, 25 and 26 are provided with angle detectors (potentiometers) for detecting the relative angles of the adjacent model arm members 20, 21, 22, and 23, respectively.
The angle signals detected by the angle detectors 25 and 26 are transmitted to the concrete pump car A by radio waves. Based on the angle signals from the angle detectors of the model arm 19, the hydraulic pressures provided at the joints of the body arm 2 so that the detected angles of the corresponding angle detectors of the body arm 2 become equal to those detected angles. The cylinders 11, 12, 13 are provided so as to be operated via a control mechanism 35 described later.

FIG. 3 shows each hydraulic cylinder 11, 12, 1.
3 is a hydraulic circuit for activating the oil pump 3, and an oil pump 30 driven by the engine 29 and a pedal in an oil supply line connecting the first hydraulic cylinder 11, the second hydraulic cylinder 12, and the third hydraulic cylinder 13; A manual control valve mechanism 31 operated via a lever operation and an electromagnetic control valve mechanism 32 operated via an operation of the arm controller B are provided side by side, and an operation method using pedals and levers and an operation method using the arm controller B are provided. Switching valves 33 and 34 are provided, and the operation of the electromagnetic control valve mechanism 32 for copying operation is provided to be controlled by a control mechanism 35 to which the angle detector of the main body arm 2 is connected.

Then, the third hydraulic cylinder 13 which is the highest position in the above oil supply line extending from the oil pump 30.
A pressure switch 36 for detecting a decrease in hydraulic pressure is provided near the control box 18 of the arm controller B.
A display 37 that emits light or sound or light and sound at the same time is provided in conjunction with the input of the output signal of the pressure switch 36. Further, there is a relief valve 38 in the oil supply pipe, and the relief valve 38 is provided so as to recirculate excess oil in the oil supply pipe to the oil tank 40 via the oil cooler 39. While a detection switch 41 for detecting the relief operation is provided for the relief valve 38,
The operation box 18 of the arm controller B is provided with a display 42 that emits light or sound, or light and sound at the same time, in response to the input of the output signal of the sensing switch 41.

Next, the operation will be described. By operating the switching valves 33 and 34, the first hydraulic cylinder 1
1, second hydraulic cylinder 12, third hydraulic cylinder 13
The hydraulic circuit of the control mechanism 3 from the manual operation of the pedal and lever
When the fourth model arm member 23 of the model arm 19 is held and moved by hand as shown in FIG. The rotation angle is detected, and the joints 5 of the body arm 2 of the concrete pump car A corresponding to each other
The rotation angles of the angle detectors provided at 6 and 7 are the joints 2
The hydraulic cylinders 11, 12, 13 are actuated via the control mechanism 35 to rotate the arm members 7, 8, 9 of the main body arm 2 until the rotation angles of 4, 25, 26 become the same. That is, it is possible to obtain a copying operation state in which the main body arm 2 makes the same movement in accordance with the operation of the model arm 19.

During such a copying operation, the hydraulic cylinders 11, 12, 13 are frequently operated simultaneously, and in this case, the arm control device B is used.
If the operating speed of the hydraulic cylinder is too fast,
Although the flow rate of the oil supplied to Nos. 2 and 13 is insufficient and the oil pressure in the oil supply pipeline is reduced, when the oil pressure in the oil supply pipeline is reduced in this way, the oil supply pipeline is provided in the oil supply pipeline. The pressure switch 36 senses this, and the output signal of the switch 36 activates the indicator 37 provided in the operation box 18 of the arm controller B to emit light or sound or light emitted from the indicator 37. The sound can alert the driver of arm control B to operate more slowly.

On the other hand, contrary to the above, if the operating speed of the arm controller B is too slow, the respective hydraulic cylinders 11, 12, 13 will be
The flow rate of the oil supplied to the tank becomes excessive, and the surplus oil flows back to the oil tank 40 through the relief valve 38, and the work capacity of the concrete pump car A is not sufficiently exhibited. Similarly, when the relief valve 38 is operated and excess oil is returned to the oil tank 40 more than necessary, the sensing switch 41 provided in the relief valve 38 senses this, and the output signal of the switch 41 is output to the arm. To operate the indicator 42 provided on the operation box 18 of the pilot B to operate the arm pilot B faster by the light or sound emitted from the indicator 42 or the light and the sound. Can call attention to.

[0016]

As described above, the present invention has the above-described structure. As described above, a switch for detecting a decrease in the oil pressure of the oil supply line is provided in the oil supply line of each hydraulic cylinder that operates the main body arm. , By providing the arm controller with an indicator that emits light or sound or light and sound simultaneously via the output signal of the switch, the operation speed of the arm controller is too fast for the driver during copying operation. Not only can this be notified, but inaccurate operation of the main body arm due to a decrease in hydraulic pressure can be prevented in advance.

Further, the relief valve of the oil supply line is provided with a switch for detecting its relief operation, and an indicator for emitting light or sound or light and sound simultaneously is provided on the arm controller via an output signal of the switch. By providing it, it is possible to inform the driver of the arm controller that the operation speed is too slow, and it is now possible to perform work at a speed that maximizes the work capacity of the concrete pump truck. .

It is preferable that the sounds emitted from both the above-mentioned indicators are different sounds so that they can be distinguished, and if the operation speed is too slow, appropriate, or too fast, they are represented by different sounds. It is also possible. That is, in the drawing showing the relationship between the amount of oil required by the hydraulic cylinders 11, 12, and 13 and the working speed shown in FIG. 4, the required amount of oil in each hydraulic cylinder is 90% (C (Line) or less, a beeping sound, for example, is sent to the driver to inform the driver that he / she will operate faster, and the required oil amount is 90% (C line) to 100% (B line) of the maximum oil supply of the oil pump. line)
When it is in the range of, for example, a beeping sound is emitted to inform that the operating speed is appropriate, and when the required oil amount exceeds 100% (line B) of the maximum oil supply of the oil pump. By making a continuous beeping sound to inform the driver that he / she will operate more slowly, the driver can easily know whether or not his / her operating speed is appropriate by three kinds of sounds.

[Brief description of drawings]

1 to 4 are views showing an embodiment of the present invention,
FIG. 1 is a side view of a concrete pump car, FIG. 2 is an external perspective view of an arm controller, FIG. 3 is a hydraulic circuit diagram, and FIG. 4 is an explanatory diagram showing a relationship between a required oil amount of each cylinder and a working speed.

[Explanation of symbols]

A ... Concrete pump car, B ... Arm controller, 1 ... Car body, 2 ... Main body arm, 3, 4, 5 ... Joint, 6 ... First arm member, 7 ... Second arm member, 8 ... Third arm member, 9
... fourth arm member, 11 ... first hydraulic cylinder, 12 ...
Second hydraulic cylinder, 13 ... Third hydraulic cylinder, 14
… Pump, 15… Conduit, 16… Hopper, 17… Hose,
18 ... Operation box, 19 ... Model arm, 20 ... First model arm member, 21 ... Second model arm member, 22 ... Third model arm member, 23 ... Fourth model arm member, 24, 2
5, 26 ... Joints, 27 ... Bearings, 28 ... Model hoses, 2
9 ... Engine, 30 ... Oil pump, 31 ... Manual control valve mechanism, 32 ... Electromagnetic control valve mechanism, 33, 34 ... Switching valve, 35 ... Control mechanism, 36 ... Pressure switch, 37 ... Indicator, 38 ... Relief valve, 39 ... Oil cooler, 40 ... Oil tank, 41 ... Sensing switch, 42 ... Indicator.

Claims (2)

[Claims] 1. An arm controller having a model arm of a similar shape in which a main body arm is reduced, as opposed to a concrete pump vehicle that is operated by a hydraulic cylinder provided with a main body arm that is bendable by a plurality of joints at each joint. And an angle detector for detecting the relative angle between the arm members connected to each other at each joint of both arms, and the angle detected by the angle detector of the main body arm is the angle detector of the model arm. In the concrete pump vehicle equipped with a copying operation device configured to cause the main body arm to follow the shape of the model arm by controlling the operation of the hydraulic cylinder through the control device so as to be equal to the detection angle by the main body arm. It is common to install a switch in the oil supply line of the hydraulic cylinder that operates the A driving speed display mechanism in a concrete pump vehicle, comprising a copying drive device in which the arm controller is provided with a display for emitting light or sound or light and sound simultaneously based on the output signal of the switch. 2. An arm controller having a model arm of a similar shape in which a main body arm is reduced, as opposed to a concrete pump car that operates by a hydraulic cylinder provided with a main body arm that is bendable by a plurality of joints at each joint. And an angle detector for detecting the relative angle between the arm members connected to each other at each joint of both arms, and the angle detected by the angle detector of the main body arm is the angle detector of the model arm. In the concrete pump vehicle equipped with a copying operation device configured to cause the main body arm to follow the shape of the model arm by controlling the operation of the hydraulic cylinder through the control device so as to be equal to the detection angle by the main body arm. A switch for sensing the relief operation of the relief valve is provided in the relief valve of the oil supply line of the hydraulic cylinder At the same time, a driving speed display mechanism in a concrete pump vehicle, which comprises a copying driving device in which a display for emitting light or sound or light and sound simultaneously is provided on the arm controller based on the output signal of the switch.