JPH0332682Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a storage device for a concrete placing boom in a concrete pump truck.

[Conventional technology]

When running a concrete pump truck, the concrete placement boom must be stored.

The concrete placement boom is stored as shown in Figures 4 and 5.
As shown in the figure, the placing boom 1 is folded and placed on a boom pedestal 3 provided on a traveling body 2. In the figure, 4 is a pipe for feeding concrete.

Conventionally, this work of retracting the pouring boom has relied on manual labor. That is, the casting boom 1 and the boom pedestal 3
Horizontal alignment is performed visually.

[Problem that the invention attempts to solve]

According to the above-mentioned manual method, the alignment of the casting boom 1 and the boom pedestal 3 relies on visual inspection and human intuition, so it is not always possible to achieve accurate alignment in one go. Work is repeated. Therefore, the storage operation is quite complicated, and since the positioning of the casting boom and the boom cradle relies on visual inspection, there is a problem that remote control is not possible.

[Means for solving problems]

This invention was created in view of the above circumstances, and
A detector that detects the retracted position in the swing direction of the casting boom, and a neutral position that switches to the position where pressure oil is fed to the hydraulic motor when the solenoid is energized and stops feeding pressure oil to the hydraulic motor when the solenoid is de-energized. a swing hydraulic drive circuit equipped with a directional control valve that switches to the swing direction; The present invention is characterized by comprising an electric drive circuit capable of bringing the solenoid into a de-energized state.

[Effect]

When the detector detects the placement boom in the retracted position,
The electric drive circuit switches the directional control valve, locks the swing hydraulic drive circuit, and stops the placing boom in the retracted position.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, the placing boom 1 is provided on a swivel base 5 so as to be able to rise and fall, and the swivel base 5 is provided on a base plate 6 so that it can be rotated.

A proximity switch 7 is provided on the base plate 6, and an operating piece 8 made of iron or magnetic material is fixed to the swivel base 5 so as to operate the proximity switch 7 at the placement boom 1 storage position.

The proximity switch 7 detects the retracted position of the pouring boom 1, and based on this detection result, the electric drive circuit shown in FIG. 2 is operated as required, and the solenoid valve of the hydraulic drive circuit shown in FIG. 3 is operated. to cut off the pressure oil supply to the hydraulic motor.

The electric drive circuit will be explained with reference to FIG.

In FIG. 2, reference numeral 9 denotes a power supply line, and 10 denotes a ground line, and a rotation inhibition circuit 11, a rotation inhibition release circuit 12, a rotation activation circuit 13, and a boom position detection circuit 14 are provided between these lines, respectively.

The rotation prohibition circuit 11 has the contact R _SW of the relay 17 and the contact R _LS of the relay 18 connected in series, the contact R ₁ of the relay 15 is connected in parallel, and the contact R ₂ of the relay 16 and the relay 15 are connected in parallel. They are connected in series.

The rotation prohibition release circuit 12 is a contact point of a relay 17.
The contact R LS of the relay 18 and the relay 16 are connected in series, whereas the R _{SW and} the contact R ₂ of the relay 16 are connected in parallel.

The swing starting circuit 13 connects the power supply line 9 and the ground line 10 to the contact point SW' ₂ of the push button switch 20,
Contact SW ₁ of push button switch 19, contact of relay 15
R ₁ and solenoid SOL ₁ are connected in series to form the left turning line 21, and the contact point of the push button switch 19 is
SW′ ₁ , contact SW ₂ of push button switch 20 , relay 1
5 contact R ₁ and solenoid SOL ₂ are connected in series to form the right turning line 22, and both lines 21, 22 are connected in series.
between the contacts SW ₁ and R ₁ , between the contacts SW ₂ and R ₁ , and the ground line 10 by connecting diodes D ₁ , D ₂ ,
Connected via relay 17, and contact point of both lines
The ground line 10 is connected between R ₁ and the solenoid SOL ₁ , between the contact R ₁ and the solenoid SOL ₂ , and through the diodes D ₄ and D ₃ and the solenoid SOL ₃ .

Additionally, the boom position detection circuit 14 is connected to the proximity switch 7.
The contact LS ₁ and the relay 18 are connected in series.

Figure 3 shows the solenoids SOL ₁ , SOL ₂ , SOL ₃
a hydraulic drive circuit controlled by 23;
is a hydraulic motor that rotates the swivel base 5 via a gear train 24. The hydraulic motor 23 has a counterbalance valve 25, a swing brake valve 26, and a directional control valve 27.
The directional control valve 27 is connected to the hydraulic pump 28 and the oil tank 29 via the hydraulic pump 28 and the oil tank 29, and the directional control valve 27 is connected to the hydraulic pump 28 by energizing the solenoids SOL ₁ and SOL ₂ , respectively.
Pressure oil is supplied to the hydraulic motor 23 in a desired direction. Further, 30 is a negative brake provided on the rotating shaft of the swivel base 5, and a cylinder 31 of the negative brake 30 is connected to a hydraulic pump 28 and an oil tank 29 via a brake release valve 32.
It is connected to the.

The operations for turning and retracting will be explained below.

First, a case will be described in which the placing boom 1 is moved from the storage position to an arbitrary rotation position.

When the power is turned on, the actuating piece 8 is in the position to actuate the proximity switch 7 when the placing boom 1 is in the retracted position, so the proximity switch 7 is turned on and the relay 1 is activated.
8 is turned on, the relay 16 is turned on and self-holding, and the relay 15 is turned off, so when the push button switch 19 or 20 is turned on, the solenoid SOL ₁ ,
SOL ₃ or solenoids SOL ₂ and SOL ₃ are energized and excited, the direction control valve 27 is switched, and the hydraulic motor 23
rotates, and the swivel base 5 rotates it in the desired direction.
When the placing boom 1 is removed from the storage position, the proximity switch 7 is turned off, the relay 18 is turned off, and the relays 15 and 16 are turned off, so the push button switches 19 and 20 are turned off.
It will continue turning as long as you hold down. When push button switches 19 and 20 are turned off, solenoid SOL ₁ ,
The power to SOL ₃ or SOL ₂ , SOL ₃ is cut off and becomes a de-energized state, the directional control valve 27 returns to the neutral position, the directional brake release valve 32 is switched, the hydraulic circuit is locked, and the cylinder 31 is returned to its original position. When the brake is applied, the swivel base will stop.

Next, a case will be described in which the placing boom is returned from an arbitrary rotation position to the storage position.

Turn on the power. At any position, the proximity switch 7 is off and the relays 15 and 16 are off, so by turning on the push button switches 19 and 20, the swivel table can be turned in the desired direction in the same manner as described above. When the placing boom 1 reaches the storage position, the proximity switch 7 is turned on. When the push button switches 19 and 20 and the proximity switch 7 are on, the relays 17 and 18 are turned on, and the relay 15 is kept on. For this reason, the contacts R ₁ and R ₁ of the left turning line 21 and right turning line 22 are opened, and the electricity to the solenoids SOL ₁ , SOL ₂ , and SOL ₃ is cut off, and the directional control valve 27 and the brake release valve 32 is switched, and the pouring boom 1 stops at the retracted position.

Furthermore, if you want to pass through the retracted position and turn, press button switches 19 and 2 when you stop at the retracted position.
Press 0 again. Push button switch 19, 20
By turning off once, relay 17 turns off, and since relay 18 is on, relay 1
6 is self-held on. Therefore, the relay 15 is turned off, and the swing starting circuit 13 is turned off by the push button switch 1.
By performing the operations 9 and 20, it becomes possible to perform a turning operation. Then, press the required push button switch 1 again.
It can be rotated by turning on 9 and 20.

In the above embodiment, a proximity switch is used to detect the retracted position of the placing boom, but it goes without saying that a micro switch, a photoelectric switch, etc. may be used instead of the proximity switch.

[Effect of idea]

As described above, according to the present invention, the retracted position of the casting boom is detected and the swing is stopped based on the detection result, eliminating human error.
It is possible to stop at an accurate storage position, there is no need for visual alignment, remote control is possible, and storage work is extremely simple.

[Brief explanation of the drawing]

Fig. 1 is a partial diagram showing the relationship between the swivel table and base plate in which the present invention was implemented, Fig. 2 is an electric drive circuit diagram according to the present invention, Fig. 3 is a hydraulic drive circuit diagram of the same, and Fig. 4 is a concrete FIG. 5, a schematic diagram of the pump truck, is a partial view showing the relationship between the casting boom and the boom cradle. 1 is a casting boom, 7 is a proximity switch, 8 is an operating piece, 27 is a directional control valve, and SOL ₁ , SOL ₂ , and SOL ₃ are solenoids.

Claims (1)

[Scope of utility model registration request] A detector that detects the retracted position in the swing direction of the casting boom, and a neutral position that switches to the position where pressure oil is fed to the hydraulic motor when the solenoid is energized and stops feeding pressure oil to the hydraulic motor when the solenoid is de-energized. a swing hydraulic drive circuit equipped with a directional control valve that switches to the swing direction; A storage device for a concrete placing boom, comprising: an electric drive circuit capable of de-energizing the solenoid.