JP2000094434A - Concrete pump truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete pump truck, in which the safety in working is improved by a method wherein a sensor is provided so as not to develop damages or the like of a boom at a work under and overloaded state. SOLUTION: In a concrete pump truck for placing a concrete from a tip hose connected to a docking hose 21 provided at the tip of a bent boom, a load sensor 31 such as a load cell or the like for measuring a load applied during the pulling-round of the tip hose is provided in the neighborhood of the mouthpiece of the docking hose 21 of the concrete pump truck.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pump truck for feeding concrete to a high place, and is provided with a sensor to prevent a boom from being damaged when working in an overloaded state, and to improve work safety. It is devised so as to improve it.

[0002]

2. Description of the Related Art FIG. 4 schematically shows a concrete pump truck having a plurality of (three-stage) booms. As shown in FIG. 4, a first boom which has a hopper 12 for charging concrete at a rear portion of a body of a concrete pump truck 11 and is provided on a swiveling base 13 via a first hydraulic cylinder 14 so as to be able to move up and down. 15, the second boom 18 and the third boom 18 via the second hydraulic cylinder 16 and the third hydraulic cylinder 17
A boom 19 is provided, and concrete is supplied to a docking hose 21 provided at the tip of the third boom 19 by a transport pipe (pipeline) 20 provided along the first to third booms 15, 18, and 19. I am sending. An end hose 23 for work is connected to the docking hose 21 via a joint 22 so that the fed concrete is driven into a work place.

[0003] The tip hose 23 connected to the docking hose 21 is attached at the work site and routed at the work site. Therefore, the docking hose 21 is provided with a tip hose guide 24 for guiding the hose. I have.

[0004]

Conventionally, FIG.
In the concrete pump truck 11 shown in FIG. 1, the overload state of the boom, that is, the tip hose 23 is suddenly pulled or the tip hose 23 is longer than a predetermined length, so that the load is applied to the docking hose 21. In such a case, since no safety measures are taken, there is a risk that the boom may be damaged, cut off, the outrigger may be damaged, or the vehicle may fall.

The present invention has been made in view of the above problems, and provides a concrete pump truck provided with a sensor for preventing the boom from being damaged when working in an overloaded state, thereby improving the safety of the work. That is the task.

[0006]

According to a first aspect of the present invention, there is provided a concrete pump truck in which concrete is driven from a tip hose connected to a docking hose provided at the tip of a bending boom. A load sensor for measuring a load acting on the docking hose is provided near the distal end.

A second aspect of the present invention is characterized in that, in the first aspect, the signal from the load sensor is transmitted as a wireless signal to a receiver provided in the pump car body.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described, but the present invention is not limited thereto.

[First Embodiment] FIG. 1 is a schematic view of a main part of a tip portion of a docking hose of a concrete pump truck according to a first embodiment.

The concrete pump truck according to the present embodiment measures the load applied when the tip hose 23 is drawn around the base of the docking hose 21 of the concrete pump truck shown in FIG. The load sensor 31 is provided.

When the load applied to the load sensor 31 exceeds a predetermined level, the operation of the boom is stopped by controlling an actuator of a solenoid valve for moving the boom so that the boom does not operate. To prevent damage.

It is also possible to provide a load sensor in any one of the first to third hydraulic cylinders 16, 17, 24. However, since the hydraulic cylinder corresponds to the boom yielding, it is folded. Since it is difficult to detect an appropriate load in the folded state or in the middle of folding, as in the present invention, the load sensor 31 is provided near the connecting point with the docking hose 21 to which the load of the tip hose 23 directly acts. It is necessary to provide a load sensor 31 at the location, and it becomes possible to accurately detect the load when an overload is applied.

The location where the load sensor is provided is not limited to the vicinity of the base of the docking hose 21, but the tip hose guide 2 for guiding the docking hose 21 is provided.
4 may be provided on the beam 24a at the tip portion.

[Second Embodiment] FIG. 2 is a schematic view of a concrete pump truck according to a second embodiment.

In the second embodiment, as in the first embodiment described above, it is necessary to send a signal to the main body of the concrete pump truck 11 when an overload is applied to the distal end hose 23. Since the concrete pump has the swivel 13 and rotates the boom to a desired position, the sensor 31
Signal from the vehicle directly to the vehicle body side,
There is a problem that the turning table 13 for turning the boom 15 cannot be turned infinitely, and the working efficiency is reduced. Also,
It is proposed to use a slip ring or the like for the rotating part for the turning table 13 for infinite turning, but the turning table 13 has a special large shape and the cost is improved. Therefore, a drive power supply is provided on the boom, and control is performed by transmitting a sensor output signal to the vehicle body wirelessly (radio wave, light, ultrasonic wave) or the like using the drive power supply. An example of this is shown in FIG.

As shown in FIG. 2, the docking hose 21
A load signal from a load sensor 31 provided at the end of the concrete pump truck 11 is sent to a signal processing device 33 via a cable 32, and a reception signal provided on a main body side of the concrete pump truck 11 from a transmitter built in the signal processing device 33. A signal is transmitted wirelessly to the device 34 using a drive power supply 35. In addition, as a drive power source for driving the signal processing device 35, for example, a solar battery, a secondary battery, or a combination thereof is used.

[Third Embodiment] FIG. 3 is a schematic view of a main part of a concrete pump truck according to a third embodiment. FIG. 3 shows that when a load equal to or more than a set value acts on the distal end portion of the distal end hose guide 24, a part of the distal end portion of the hose guide 24 becomes a deformable portion 41 which can be deformed.
In the present embodiment, when an overload is applied to the hose guide 24, a part of the hose guide 24 is deformed so as to be safely broken, so that other booms and the like are not damaged. That is, the strength of a part of the hose guide 24 is weakened to replace the load sensor described above, and the operator is notified of the overload without damaging the boom. Specifically, 3
In the case of a stepped boom concrete pump truck, etc.
Approximately 350 kg
-The hose guide 24 itself is deformed by lowering it to about F. In this way, when the hose guide 24 is overloaded, the hose guide itself is deformed so that the operator is notified that the overload has occurred so that the boom or the like is not deformed and an accident is caused. I have.

[0018]

As described above, according to the first aspect of the present invention, in a concrete pump truck in which concrete is driven from a tip hose connected to a docking hose provided at the tip of a bending boom, Since a load sensor for measuring the load acting on the docking hose is provided near the distal end, when the load applied to the load sensor 31 exceeds a predetermined level, the electromagnetic valve for moving the boom so as not to operate the boom is provided. By controlling the actuator and the like, the operation of the boom can be stopped, and damage to the boom and the like can be prevented.

According to [claim 2], in claim 1, the signal from the load sensor is transmitted to the receiver provided in the pump car body by a wireless signal, so that the turntable can be turned infinitely. This makes it possible to transmit the load signal to the vehicle body without lowering the work efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part of a concrete pump truck according to a first embodiment.

FIG. 2 is a schematic view of a main part of a concrete pump truck according to a second embodiment.

FIG. 3 is a schematic diagram of a main part of a concrete pump truck according to a third embodiment.

FIG. 4 is a schematic view of a concrete pump truck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Concrete pump truck 12 Hopper 13 Swivel base 14 1st hydraulic cylinder 15 1st boom 16 2nd hydraulic cylinder 17 3rd hydraulic cylinder 18 2nd boom 19 3rd boom 20 Transport pipe 21 Docking hose 22 Joint 23 Tip hose 24 Tip hose Guide 31 Load sensor 32 Cable 33 Signal processor 34 Receiver 35 Drive power supply 41 Deformation part

Claims (2)

[Claims] 1. A concrete pump truck for driving concrete from a tip hose connected to a docking hose provided at the tip of a bending boom, a load sensor for measuring a load acting on the docking hose is provided near the tip of the docking hose. A concrete pump truck characterized by becoming. 2. The concrete pump truck according to claim 1, wherein the signal from the load sensor is transmitted as a wireless signal to a receiver provided on the pump truck body.