JPH0117659Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic swing pipe swinging device for swinging a swing pipe of a concrete pump.

Conventionally, in order to pour the ready-mixed concrete supplied from a concrete plant or truck mixer into formwork at the pouring site, a hopper is used to introduce the ready-mixed concrete, and a pair of cylinders are used to suck in and discharge the ready-mixed concrete from the hopper. , is swingably supported in the hopper, one end is alternately connected to each of the cylinders, and the other end is constantly connected to the transport pipe, and the ready-mixed concrete is discharged by the piston in the cylinder. Concrete pumps are used which have a swing pipe (valve) guiding into the transport pipe.

By the way, in this concrete pump, the inside of the swing pipe must be cleaned in order to remove the ready-mixed concrete remaining inside the swing pipe when transport of the ready-mixed concrete is finished. Even if the transport pipe is removed from the swing pipe while communicating with the cylinder in which the piston reciprocates, and cleaning water is simply supplied into the swing pipe from the opening on the side of the swing pipe connected to the transport pipe, the swing pipe The cleaning water inside will not flow out into the hopper.
The inside of the swing pipe cannot be cleaned properly. Therefore, it is necessary for the worker to supply cleaning water into the swing pipe while swinging the swing pipe by switching a switch at regular intervals for cleaning.This work is done while the worker constantly monitors the swing pipe. The disadvantage is that it is a very time-consuming and troublesome task.

The present invention was developed in view of the above circumstances, and its purpose is to provide an automatic swing pipe singing device that can clean the swing pipe with a simple operation and is free from the risk of erroneous operation. It is in.

In order to achieve the above object, the present invention includes a hopper into which fresh concrete is introduced, a pair of cylinders which are moved by a cylinder-driving hydraulic device to suck in and discharge the ready-mixed concrete from the hopper;
a swing pipe that is provided in the hopper and is swung by a swing pipe swinging hydraulic device about one end connected to the transport pipe as a fulcrum, so that the free end communicates alternately with the pair of cylinders; The pump switch turns on the control circuits of the electromagnetic directional switching valves of the hydraulic system for driving the cylinder and the hydraulic system for swinging the swing pipe, operating the pair of cylinders and the swing pipe, and moving the fresh concrete in the hopper through the swing pipe. In a concrete pump configured to pump concrete into a transport pipe, a switching command circuit that outputs a switching command at regular intervals is installed in parallel with the above control circuit, and when turned on by an automatic swing switch, the output of the switching command circuit is Therefore, a solenoid excitation switching circuit that alternately excites the two solenoids of the electromagnetic directional control valve of the swing pipe swinging hydraulic system is incorporated in the control circuit, and a relay operated by the pump switch is included in the switching command circuit. The configuration is such that a b contact is provided. Hereinafter, the present invention will be specifically explained with reference to the drawings.

1 and 2 show an embodiment of the present invention, and reference numeral 1 in the figures is a concrete pump, and this concrete pump 1 has a hopper 2 into which fresh concrete is poured, and one side wall of this hopper 2. a pair of cylinders 3 and 4, which are fixed to the hopper 2 and whose openings 3a and 4a at one end communicate with the inside of the hopper 2;
A crank-shaped swing disposed within the hopper, one end 5a rotatably supported by the other side wall of the hopper 2, and the other end 5b alternately communicating with one of the cylinders 3 and 4. A pipe 5, pistons 6 and 7 slidably disposed in each cylinder 3 and 4, and rods 6a and 7 that are connected to the other end of each cylinder 3 and 4 and connect the pistons 6 and 7 to each other.
a hydraulic device 8 driven through a, a swinging shaft 9 connected to one end 5a of the swing pipe 5 and having one end protruding outside the hopper 2, and a projecting end of the swinging shaft 9. and a hydraulic system 11 connected by a crank mechanism 10. Also,
Each cylinder 3, 4 communicates with each other at the other end.

The hydraulic system 8 has a rod 6 connected to the pistons 6 and 7.
actuators 12, 13 connected via a, 7a, respectively, and each actuator 12, 13
an electromagnetic directional switching valve 16 connected to one end by piping 14, 15; a hydraulic pump 18 connected to the electromagnetic directional switching valve 16 by piping 17;
It is composed of a motor 19 that drives this hydraulic pump 18. Moreover, the actuator 12,1
3 are connected to each other at the other end by a pipe 20, and in a space A formed by this pipe 20 and the actuators 12, 13,
Oil is sealed and separated from the oil supplied by pipes 14 and 15. Furthermore, pistons 6, 7
Magnets 21 and 22 are provided at the ends of the rods 6a and 7a on the actuator side, respectively, and reed switches 23 and 24 operated by the magnets 21 and 22 are connected to the pistons 6 and 7a, respectively.
It is installed at the turning point of 7. Furthermore, the electromagnetic directional switching valve 16 is provided with two solenoids 25 and 26 for switching the direction in which oil flows.
It is configured to control the reciprocating motion of the pistons 6 and 7 of the concrete pump by alternately exciting the concrete pump.

The hydraulic system 11 includes an actuator 27 connected to the crank mechanism 10, an electromagnetic directional switching valve 30 connected to both ends of the actuator 27 by piping 28, 29, and a piping 31 connected to the electromagnetic directional switching valve 30. Hydraulic pump 3 connected by
2, and a motor 33 that drives this hydraulic pump 32.
It is composed of. In addition, the electromagnetic directional control valve 3
0 is provided with two solenoids 34 and 35 for switching the direction of oil flow.
The swinging motion of the swing pipe 5 is controlled by alternately exciting the two solenoids 34 and 35.

Next, an electric circuit section for driving the concrete pump 1 will be explained with reference to FIG. 2. Reference numeral 36 in the figure is a power switch 36, one end of which is connected to the power supply side, and the other end connected to the anodes of the thyristors SCR ₁ and SCR ₂ , respectively. The cathode of thyristor SCR ₁ is connected to the anode of diode D ₁ and connected to the anode of thyristor SCR ₁ via capacitor C ₁ , and the cathode of thyristor SCR ₂ is connected to the anode of diode D ₂ . , and connected to the anode of thyristor SCR ₂ via capacitor C ₂ . Further, the cathode of the diode _D1 is connected to one end of the solenoid 25 via the b contact 37a of the relay 37, and
The relay 37 is connected to one end of the solenoid 26 via an a contact 37b. The other end of the solenoid 25 is connected to the power source via an a contact 38a of a relay 38, and the other end of the solenoid 26 is connected to a power source via an a contact 38b of the relay 38. Furthermore, a pilot lamp 3 is provided between one end of the solenoid 25 and the other end of the solenoid 26.
A pilot lamp 40 is connected between one end of the solenoid 26 and the other end of the solenoid 25. And diode D ₃
The cathode of the diode D3 is connected to one end of the solenoid 25, the anode of the diode _D3 is connected to the other end of the solenoid 25, and the diode _D4 is connected to the other end of the solenoid 25.
The cathode of the diode D4 is connected to one end of the solenoid 26, and the anode of the diode _D4 is connected to the other end of the solenoid 26.

The cathode of the diode _D1 is connected to one end of the b contact 42a and one end of the a contact 42b of the relay 42 via the changeover switch 41, and is connected to one end of the b contact 42c of the relay 42 and one end of the a contact 42b of the relay 42 through the changeover switch 43. Each is connected to one end of the a contact 42d. And b of relay 42
The other end of the contact 42a and the other end of the A contact 42d are connected to one end of the solenoid 34, and the other end of the A contact 42b and the other end of the B contact 42c of the relay 42 are connected to one end of the solenoid 35. A solenoid excitation switching circuit Y is configured by the a contacts 42b, 42d and the b contacts 42a, 42c of the relay 42. Further, one end of the solenoid 34 is connected to the cathode _of the diode _D5 , and one end of the solenoid 35 is connected to the cathode of the diode _D6 .
The anodes of D ₆ are each connected to the power supply side.

Further, a resistor _R1 and a counter C are connected between the cathode of the diode _D1 and the power supply side, respectively. The cathode of diode _D7 is connected to the cathode of diode _D1 , and the anode of diode _D7 is connected to the power supply side.

The cathode of the diode D ₂ above is the relay 3 above.
It is connected to one end of the solenoid 25 through the a contact 37c of the relay 37, and the b contact 37d of the relay 37.
It is connected to one end of the solenoid 26 via. Further, the cathode of the diode _D2 is connected to the changeover switches 41 and 43, and the changeover switches 41 and 43 are configured to operate in conjunction with each other. Furthermore, a resistor R ₂ is connected between the cathode of the diode D ₂ and the power supply side.

The gate of the above thyristor SCR ₁ is connected to one end of the resistor R ₃ via the inductance L ₁ ,
The other end of the resistor R ₃ is connected to one end of the a contact 44a and one end of the b contact 44b of the relay 44, respectively. Further, the gate of thyristor SCR ₂ is connected to one end of resistor R 4 via inductance L ₂ , and the other end of resistor _{R 4 is} connected to a contact 44 of relay 44 .
c and one end of the b contact 44d, respectively. A resistor R ₅ and a capacitor C 3 are connected in parallel between one end of the resistor R 3 and the cathode of the thyristor SCR ₁ , and a resistor R ₅ and a capacitor C ₃ are connected in parallel between one end of the resistor R ₄ and the cathode of the thyristor SCR ₄ . ,resistance
R ₆ and capacitor C ₄ are connected in parallel, and the cathode of thyristor SCR ₁ and the thyristor
Capacitors C ₅ and C ₆ are connected in series with the cathode of SCR ₂ . Furthermore, b of the relay 44
The other end of the contact 44b and the other end of the A contact 44c are connected to one end of the reed switch 23, and the other end of the A contact 44a and the other end of the B contact 44d of the relay 44 are connected to one end of the reed switch 24. has been done. The other end of the reed switch 23 and the other end of the reed switch 24 are connected to the a contact 45 of the relay 45.
A is connected to the other end of the power switch 36 via a terminal B, and between the other end of the B contact 44b of the relay 44 and the other end of the power switch 36, there is a B contact 46a of the relay 46 and a B contact of the relay 45. 45b are connected in series.

One end of the relay 38 and one end of the relay 46 are connected to the other end of the power switch 36, and the other end of the relay 38 and the other end of the relay 46 are connected to the power source via a pump switch 47. There is. Further, between the other end of the power switch 36 and one end of the relay 45, the a contact 4 of the relay 45 is connected.
5c and the b contact 46b of the relay 46 are connected in parallel, and the other end of the relay 45 is connected to the power supply side. Further, between one end of the relay 37 and the other end of the power switch 36, an a contact 44e of the relay 44 and an a contact of the maximum pressure test switch 48 are connected.
The contacts 48a are connected in parallel, and the relay 37
The other end is connected to the power supply side. Furthermore, one end of the relay 44 is connected to the other end of the power switch 36, and the other end of the relay 44 is connected to the power supply side via the a contact 49a of the piston reverse switch 49, and the auto reverse circuit. 50. This auto-reverse circuit 50 is configured such that when the concrete pump 1 is closed and the hydraulic pressure of the hydraulic system reaches the maximum pressure, a pressure switch inside the circuit is activated and conduction is established between both ends of the circuit for a certain period of time. The auto-reverse switch 51, the b-contact 48b of the maximum pressure test switch 48, and the b-contact 49b of the piston reverse switch 49 are connected in series between the other end of the auto-reverse circuit 50 and the power supply side. There is. The a contact 48a and the b contact 48b of the maximum pressure test switch 48 have an interlocking mechanism, and the a contact 49a and b contact 49b of the piston reverse switch 49 have an interlocking mechanism.

Furthermore, one end of the relay 42 is connected to the on/off timer 52 via a contact 52a of the on/off timer 52.
2 and one end of the automatic swing switch 53, and the other end of the relay 42 and the other end of the on/off timer 52 are connected to the power supply side. This on/off timer 52 is configured to open and close a contact 52a at regular intervals (in this embodiment,
ON time t ₁ = 2 seconds, OFF time t ₂ = 2 seconds). Further, the other end of the automatic swing switch 53 is connected to the other end of the power switch 36. The on/off timer 52, its contact 52a, and the relay 42 constitute a switching command circuit Y.

Reference numeral 38c is a b contact of the relay 38, which is connected in series to the on/off timer 52. Therefore, unless the pump switch 47 is turned off, the switching command circuit Y will not become effective, and the swing pipe automatic movement device will not operate during pump operation.

Next, the operation of the swing pipe automatic singing device configured as described above will be explained.

First, the power switch 36 is turned on, and then the pump switch 47 is turned on. Then, relay 45
is energized, the A contacts 45a, 45c close, and the B contact 45b opens, and the relays 38 and 46 are energized, the A contacts 38a, 38b close, and the B contacts 46a, 46b, 38c open. The pistons 6, 7 of the pump 1 reciprocate. When one piston 6 retreats to a predetermined position, the reed switch 23 closes, and the relay 44 is switched from the reed switch 23 to b.
A gate current flows to the gate of the thyristor SCR ₁ via the contact 44b, the resistor R ₃ and the inductance L ₁ , and the thyristor SCR ₁ becomes conductive. As a result, excitation current is supplied from the thyristor SCR ₁ through the diode D ₁ to the solenoid 25 via the b contact 37a of the relay 37, and to the solenoid 35 via the changeover switch 43 and the b contact 42c of the relay 42. Solenoid 25, 35
works. As a result, the piston 6 starts to move forward, the piston 7 starts to move backward, and at the same time, the swing pipe 5 is opened at the opening 3a of the cylinder 3.
Since the piston 6 communicates with the cylinder 3, the piston 6 pumps the fresh concrete in the cylinder 3 into the swing pipe 5, and the piston 7 sucks the fresh concrete from the hopper 2 into the cylinder 4. When the piston 7 retreats to a predetermined position, the reed switch 24 closes, and a gate current flows from the reed switch 24 to the gate of the thyristor SCR ₂ via the b contact 44d of the relay 44, the resistor R ₄ , and the inductance L ₂ . , thyristor SCR becomes conductive.
This allows thyristor SCR ₂ to diode D ₂
The excitation current passes through the B contact 37d of the relay 37.
to the solenoid 26 via the selector switch 4.
1 and the solenoid 34 through the b contact 42a of the relay 42, so that the solenoid 2
6, 34 works. As a result, the piston 6 starts to retreat, and the piston 7 starts to move forward, and at the same time, the swing pipe 5 communicates with the opening 4a of the cylinder 4, so the piston 7 moves the ready-mixed concrete in the cylinder 4 to the swing pipe 5. At the same time, the piston 6 sucks fresh concrete from the hopper 2 into the cylinder 3.

In this way, fresh concrete is sucked into the cylinders 3 and 4 from the hopper 2, and is forced through the swing pipe 5 to a predetermined location. Next, when the pump switch 47 is turned off after the fresh concrete pumping operation is completed, the relays 38 and 46 are demagnetized, opening the a contacts 38a and 38b and closing the b contacts 46a, 46b and 38c. At this time, if the thyristor SCR ₁ is in a conductive state, the solenoid 25, which had been excited by the exciting current of the thyristor SCR ₁ , is demagnetized, and the pistons 6 and 7 stop reciprocating. In this state, when the automatic swing switch 53 is turned ON, current flows to the on/off timer 52 and activates the on/off timer 52, so the contact 52a is turned on for the preset ON time t ₁
and OFF time T ₂ (in this example, t ₁ = t ₂ = 2 seconds)
Repeat ON-OFF. As a result, the relay 42 is first excited for ON time _t1 . Then, the a contacts 42b and 42d of the relay 42 open, and the b contact 4
2a and 42c are closed. Therefore, the solenoid 34, which has been energized up to now, is demagnetized and the solenoid 35 is energized, so the swing pipe 5, which was communicating with the opening 4a of the cylinder 4, now communicates with the opening 3a of the cylinder 3. . In this way, if the cleaning water is supplied into the swing pipe 5 from the one end 5a side of the swing pipe 5 while the swing pipe 5 is swinging at a constant period,
As the swing pipe 5 swings, water flows out into the hopper 2 from the other end 5b of the swing pipe 5, so that the swing pipe 5 can be efficiently cleaned.

As explained above, the present invention includes a hopper into which fresh concrete is introduced, a pair of cylinders that are moved by a cylinder-driving hydraulic system to suck and discharge the ready-mixed concrete into the hopper, and a swing pipe which is swung by a swing pipe swinging hydraulic device with one end connected to the transport pipe as a fulcrum, and whose free ends are alternately connected to the pair of cylinders, and the pump switch The control circuits of the electromagnetic directional switching valves of the hydraulic system for driving the cylinder and the hydraulic system for swinging the swing pipe are turned on to operate the pair of cylinders and swing pipe, and the ready-mixed concrete in the hopper is transferred to the transport pipe via the swing pipe. In a concrete pump configured to deliver,
A switching command circuit that outputs switching commands at regular intervals is installed in parallel with the above control circuit, and when turned on by an automatic rocking switch, the electromagnetic directional control valve of the swing pipe swinging hydraulic system is activated by the output of the switching command circuit. Since the solenoid excitation switching circuit that alternately excites the two solenoids is incorporated into the control circuit, the swing pipe can be automatically swung with a simple operation. Therefore, the inside of the swing pipe can be easily and efficiently cleaned while swinging, which has an excellent effect of reducing the burden on the operator.
Further, the switching command circuit is provided with a b contact of a relay operated by the pump switch,
If the pump switch is not turned off,
Since the switching command circuit is configured not to be activated, it is safe because the swing pipe automatic movement device will not be activated by mistake during pump operation.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a schematic configuration diagram and FIG. 2 being a circuit diagram. DESCRIPTION OF SYMBOLS 1... Concrete pump, 11... Hydraulic device, 30... Electromagnetic directional control valve, 34, 35... Solenoid, 53... Automatic rocking switch, X... Solenoid excitation switching circuit, Y... Switching command circuit.

Claims (1)

[Scope of utility model registration request] A hopper 2 into which fresh concrete is charged, a pair of cylinders 3 and 4 which are moved by a cylinder driving hydraulic device 8 to suck and discharge the fresh concrete in the hopper 2, and are provided in the hopper 2, A swing pipe 5 is swung by a swing pipe oscillating hydraulic device 11 with one end connected to the transport pipe as a fulcrum, and the free ends are alternately communicated with the pair of cylinders 3 and 4, and the pump switch 47, the control circuits of the electromagnetic directional control valves 16, 30 of the cylinder driving hydraulic device 8 and the swing pipe swinging hydraulic device 11 are turned on to operate the pair of cylinders 3, 4 and the swing pipe 5, and the hopper 2 is turned on. In the concrete pump configured to send out the fresh concrete inside to the transport pipe via the swing pipe 5, a switching command circuit Y that outputs a switching command at regular intervals is installed in parallel with the above control circuit, and an automatic swinging The electromagnetic directional switching valve 3 of the swing pipe swinging hydraulic device 11 is turned ON by the switch 53 and is activated by the output of the switching command circuit Y.
A solenoid excitation switching circuit X that alternately excites the two solenoids 34 and 35 of 0 is incorporated in the control circuit, while a b contact 38c of the relay 38 operated by the pump switch 47 is connected to the switching command circuit Y. An automatic swing pipe swinging device for a concrete pump, characterized in that it is provided with a swing pipe swinging device for a concrete pump.