JPH04259681A - Multiple concrete pump device - Google Patents

Abstract

PURPOSE:To accomplish effective transportion of ready-mixed concrete by sending that of the position signals which has reached the earliest from a pair of position sensing means for each concrete pump, to the main direction selector valves and the valve operation selector valves of all concrete pumps synchronously. CONSTITUTION:A pair of position sensing means LS1, LS2 of each concrete pump 3, 4 sense whether pistons 9a, 10a of concrete transporting cylinders 9, 10 are advancing or retreating. A position signal is given to a control means, which takes that of the signals having reached the earliest as a switching signal and sends it synchronously to the main direction selector valves of the concrete pumps 3, 4, and also to the valve operation selector valves of them synchronously. Thereby the cylinders 9, 10 of the two concrete pumps 3, 4 operate in synchronization, which allows effective transportation of ready-mixed concrete.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple concrete pump system which enables the pumping of large volumes of fresh concrete and the like.

0002

2. Description of the Related Art Concrete pumps are generally used for pumping fresh concrete, dredging sludge, or excavated earth and sand generated during tunnel construction. This concrete pump is also required to have a large pumping capacity from the viewpoint of improving efficiency. Under such circumstances,
In general, concrete pumps are double piston pumps, which consist of a hopper for charging fresh concrete, a pair of concrete transfer cylinders that suck and discharge the fresh concrete in the hopper with a piston, and a valve actuation cylinder. Driven to alternately communicate the transport pipe with one of the pair of concrete transport cylinders,
A flow path switching valve that alternately communicates the other with the hopper and vice versa, a pair of hydraulic cylinders that advance and retreat pistons in the pair of concrete transfer cylinders, and a pair of hydraulic cylinders. The main direction control valve is connected to the main direction control valve, and the valve operation switching valve is connected to the valve operation cylinder.

0003

[Problems to be Solved by the Invention] In the concrete pump consisting of the above-mentioned double piston pump, the diameter of the concrete transfer cylinder and the swinging pipe serving as the flow path switching valve is often about 200 to 250 mm. However, in order to increase the pumping capacity, the diameter was increased even further (30
0 to 500 mm), it becomes technically difficult to manufacture and the weight increases significantly.

For example, when increasing the capacity of a concrete pump that has a capacity of discharging 150 m3/hr using a concrete transfer cylinder of approximately 250 mm in diameter, this can be achieved by increasing the switching frequency, stroke length, and piston speed. Due to this difficulty, under the same conditions, for example, in order to secure a discharge rate of 300 m3/hr, the diameter of the concrete transfer cylinder must be approximately 360 mm. Since the rate of increase in part weight is proportional to the cube of the volume increase rate, the part weight is (360/250)3≈4 times.

[0005] As described above, as the weight increases, the reaction when switching the flow path switching valve increases proportionally, resulting in excessive inertia and loss time due to switching between intake and discharge of fresh concrete in the concrete transfer cylinder. This results in a decrease in efficiency. Therefore, it is possible to increase the capacity by arranging two or more concrete pumps in parallel. With this plan, it is difficult to synchronize the timing of switching between suction and discharge of each concrete pump due to changes in the amount of oil sealed in the hydraulic cylinders. There is a risk of fresh concrete flowing back.

Furthermore, in this case, the amount of oil sealed in the hydraulic cylinder of one of the concrete pumps changes, and in particular,
When the sealing volume increases, the stroke of the piston of the concrete transfer cylinder in the concrete pump becomes longer, and before the limit switch of one concrete transfer cylinder is activated, the hydraulic cylinder of the other concrete transfer cylinder is closed. This will cause the tip of the piston to collide with the cylinder head.

The present invention has been made to solve the above-mentioned problems, and its purpose is to eliminate the need to increase the diameter of the flow path switching valve or concrete transfer cylinder without causing a decrease in efficiency. An object of the present invention is to provide a multiple concrete pump device that can achieve a large capacity without causing any problems.

[0008]

[Means for Solving the Problems] The present invention has a hopper for charging fresh concrete, a pair of concrete transfer cylinders for sucking and discharging the fresh concrete in the hopper with a piston, and a cylinder driven by a valve operating cylinder. a flow path switching valve that alternately connects one of the pair of concrete transfer cylinders to one of the concrete transfer cylinders and connects the other to the hopper, and vice versa; A concrete pump is installed in parallel, including a pair of hydraulic cylinders that move the pistons in the cylinders forward and backward, a main directional control valve connected to the pair of hydraulic cylinders, and a valve operation switching valve connected to the valve operation cylinder. Two or more units are placed between the flow switching valve of each concrete pump and the transport pipe, with the inlet end communicating with the discharge port of each flow switching valve, and the outlet end communicating with the connection port of the transport pipe. A pair of position detection means for detecting the forward or backward state of the piston is provided on both concrete transfer cylinders of each concrete pump, respectively, and It has a control means that receives each position signal and sends the position signal that reaches the fastest as a switching signal in synchronization with the main direction switching valve of each concrete pump and also in synchronization with the valve operation switching valve of each concrete pump. It is characterized by the fact that

[0009]

According to the present invention, in each concrete pump, the forward or backward state of the piston in the concrete transfer cylinder is detected by the pair of position detecting means. Then, a position signal is transmitted from the position detection means of each concrete pump to the control means, and in the control means, the position signal that reaches the fastest is used as a switching signal. The switching signal is sent from the control means to the main direction switching valve of each concrete pump in synchronization, and also to the valve operation switching valve of each concrete pump in synchronization.

[0010] Therefore, the concrete transfer cylinders of each concrete pump operate synchronously, and
The valve actuating cylinders of each concrete pump operate in synchronization, and the fresh concrete discharged from each concrete pump joins together via the discharge branch pipe and is efficiently sent to the transport pipe.

[0011]

[Embodiment] A multiple concrete pump device according to an embodiment of the present invention will be explained below with reference to FIGS. 1 to 6. In FIG. 1, reference numeral 1 denotes a multiple concrete pump device according to the present embodiment, which includes first and second concrete pumps 3 and 4 that are arranged in parallel and have a common hopper 2. A pair of connecting pipes 5 and 6 are arranged in the hopper 2, and one ends 5A and 6A of each of the connecting pipes 5 and 6 protrude outside the hopper 2. At one end 5A, 6A of each connecting pipe 5, 6,
The inlet ends 7A, 7A of the discharge multi-branch pipe 7 are connected to each other,
The outlet end 7B of the discharge multi-branch pipe 7 is connected to the connection port 8A of the transport pipe 8.

Next, each of the concrete pumps 3 and 4 has a common structure, and this structure will be explained by taking the first concrete pump 3 as an example. 1 to 3, reference numerals 9 and 10 denote a pair of concrete transfer cylinders that suck and discharge fresh concrete in the hopper 2 using concrete pistons 9a and 10a.

Reference numeral 11 denotes a swinging pipe as a flow path switching valve, which is swingably provided in the hopper 2, with a discharge port formed at one end 11a connected to the connecting pipe 5, and the other end 11b being a free end. The swing tube 11 is rotated about the axis of one end 11a, and is swinged so that the other end 11b is alternately communicated with the pair of concrete transfer cylinders 9 and 10. 12 is a valve actuation cylinder that swings the swing tube 11.

Reference numerals 13 and 14 denote a pair of hydraulic cylinders, and rods 13a and 1 of hydraulic pistons 13e and 14e respectively.
4a is connected to concrete pistons 9a, 10a in a pair of concrete transfer cylinders 9, 10, and moves the concrete pistons 9a, 10a forward and backward. Each one end side working chamber 13b of a pair of hydraulic cylinders 13 and 14
, 14b, a main directional control valve 16 consisting of an electromagnetic directional control valve.
are connected to each other via a first conduit 17 and a second conduit 18. The working chambers on the other end side of each hydraulic cylinder 13 and 14 communicate with the pipe line 15. Main directional control valve 1 above
6 has a pair of solenoids SV1 and SV2. A main hydraulic pump 19 is connected to the main directional control valve 16 via a third pipe 20. 21 is the hydraulic oil tank,
It is connected to the main directional control valve 16 via the fourth conduit 22 .

The valve operating cylinder 11 is connected to the valve operating switching valve 25 via the fifth pipe line 23A and the sixth pipe line 23B.
The switching valve 25 for valve operation is connected to the solenoid SV3.
, SV4. 24A is a hydraulic pump for valve operation, and is connected to the switching valve 25 for valve operation via the seventh pipe 20A. 24B is a hydraulic oil tank, and the eighth pipe 22A
It is connected to the valve actuation switching valve 25 via.

[0016] A first limit switch (position detecting means) LS1 consisting of a reed switch for detecting the movement stroke of the hydraulic piston 13e of the hydraulic cylinder 13 is connected to a probe tube 13d installed inside the hydraulic cylinder 13 along the axial direction. A magnet 1 is inserted into and fixed at the tip of the hydraulic piston 13e of the hydraulic cylinder 13 in correspondence with the first limit switch LS1.
3c is provided.

On the other hand, the hydraulic piston 1 of the hydraulic cylinder 14
A second limit switch (position detection means) LS2 consisting of a reed switch that detects the movement stroke of 4e is
It is inserted and fixed into a probe tube 14d installed along the axial direction of the hydraulic cylinder 14, and the second
Hydraulic cylinder 1 corresponds to limit switch LS2.
A magnet 14 is placed at the tip of the hydraulic piston 14e of No. 4.
c is provided.

In FIG. 3, the control means consisting of the general control device 27 of the multiple concrete pump device 1 controls each of the control devices 28, 28 having the same configuration of each concrete pump 3, 4 as shown in FIG. connected and configured. The input side of the control device 28 of the first concrete pump 3 is connected to the first limit switch LS1 and the second limit switch LS2 of the first concrete pump 3, and the output side is connected to the main direction of the first concrete pump 3. It is connected to a pair of solenoids SV1 and SV2 of the control valve 16, and also to a pair of solenoids SV3 and SV4 of a valve operation switching valve 25 of the first concrete pump 3. On the other hand, the input side of the control device 28 of the second concrete pump 4 is connected to the second concrete pump 4.
The output side is connected to a pair of solenoids SV1 of the main directional control valve 16 of the second concrete pump 4.
, SV2, and a pair of solenoids S of the switching valve 25 for valve operation of the second concrete pump 4.
It is connected to V3 and SV4 (details will be explained with reference to the sequence circuit in FIG. 4).

Next, each of the above-mentioned control devices 28, 28, each limit switch LS1, LS2, each solenoid SV
1, SV2, SV3, and SV4 is shown as a sequence circuit in FIG. As shown,
A pumping on circuit, a pumping off circuit, a piston reverse circuit, a piston switching circuit, a pumping switching circuit, a valve switching circuit, and a valve reverse circuit are connected between the power supply + side 29 and the power supply - side 30, respectively.

In the pumping-on circuit, in the forward direction from the power supply + side 29, the a contact 31A of relay R1 (31), the b contact 3 of relay R2 (32) in the pumping off circuit,
2A, relay R1 (31) is provided, and the relay R2
The input end of the b contact 32A (32) and the power supply + side 29 are connected via a pumping switch 33. The pumping-off circuit is provided with a stop switch 34 and a relay R2 (32) in the forward direction from the power supply + side 29.

The piston reverse circuit connects the power supply + side 29 to the a contact 35A of relay R3 (35) and the relay R5 (35).
7) b contact 37A and relay R3 (35) are installed in series in order, and relay R5 (3
7) A circuit in which the a contact 37B and relay R4 (36) are installed in series in order, and a circuit in which piston reverse changeover switch 38 and relay R5 (37) are installed in series in order from power supply + side 29. These three circuits are connected in parallel, and the input end of relay R3 (35) and the input end of relay R4 (36) are connected.

In the piston switching circuit, the power supply + side 2
The c contact 41A of the relay R8 (41) is connected to the c contact 41A of the relay R1 (31) through the a contact 31B of the relay R1 (31).
The b contact part of 1A is the c contact 35B of relay R3 (35)
The solenoid SV1 is connected to one end of the solenoid SV1 via the a contact portion of the solenoid SV1, and the other end of the solenoid SV1 is connected to the power supply side 30.

The a contact part of the c contact 41A of the relay R8 (41) is connected to one end of the solenoid SV2 via the a contact part of the c contact 35C of the relay R3 (35), and the other end of the solenoid SV2 is connected to the power supply. side 30. The output end of the b contact portion of the c contact 41A of the relay R8 (41) is connected to one end of the solenoid SV2 via the b contact portion of the c contact 35C. On the other hand, relay R8
The output end of the a contact portion of the c contact 41A (41) is connected to one end of the solenoid SV1 via the b contact portion of the c contact 35B.

In the pumping switching circuit, a first limit switch LS1 and a second limit switch LS2 are connected in parallel to the power supply + side 29, and the first limit switch LS1 is connected to one c contact 36 of relay R4 (36).
A contact part, power supply + side 2 via relay R6 (39)
Connected to 9. The second limit switch LS2 is connected to the power supply + side 29 via the a contact portion of the other c contact 36B of the relay R4 (36) and the relay R7 (40). Further, the output end of the first limit switch LS1 is connected to the input end of the relay R7 (40) via the b contact part of the other c contact 36B of the relay R4 (36), and the output end of the second limit switch LS2 is connected to the input end of the relay R7 (40). is connected to relay R6 (39) via the b contact part of one c contact 36A of relay R4 (36).
) is connected to the input end of the Furthermore, the a contact 40 of relay R7 (40) is connected between the power supply + side 29 and the power supply - side 30.
A, b contact 39A of relay R6 (39), relay R8 (
41) are connected in series in order. Also, relay R7
The input end of (40) and the input end of relay R8 (41) are connected.

In the valve switching circuit, the power supply + side 29
The a contact part and b of the c contact 41B of relay R8 (41)
The contact parts are connected in parallel, and the a contact part of the c contact 41B of relay R8 (41) is connected to the power supply side 30 via the b contact part of one c contact 42A of relay R9 (42) and the solenoid SV3. and the c contact 41 of relay R8 (41)
The b contact part of B is the other c contact part 4 of relay R9 (42).
The b contact part of the relay R8 (41) is connected to the power supply side 30 via the solenoid SV4, and the output end of the a contact part of the other c contact part 41B of the relay R8 (41) is connected to the other c contact part 42.
It is connected to the input end of solenoid SV4 via the a contact part of B. On the other hand, c contact 41 of relay R8 (41)
The output end of the b contact portion of B is connected to the input end of the solenoid SV3 via the a contact portion of one c contact 42A.

In the valve reverse circuit, a valve switch 43 and a relay R9 (42) are provided in series between the power supply + side 29 and the power supply - side 30. Figure 5
is each control device 28, 2 of each concrete pump 3, 4
8 connection circuits are shown. In the connection circuit, the first limit switch L on the first concrete pump 3 side
S1 output end and the first concrete pump 4 side
The output end of limit switch LS1 is changeover switch 4
Connected via 4. The output end of the second limit switch LS2 on the first concrete pump 3 side and the second limit switch LS2 on the second concrete pump 4 side
is connected to the output end of the switch 45 via a changeover switch 45. The above-mentioned changeover switches 44 and 45 are operated in conjunction with each other, and are normally on and turned off as necessary.

FIG. 6 also shows that each concrete pump 3,
4 shows a connection circuit between a piston reverse circuit and a valve reverse circuit between each of the control devices 28 and 28 of No. 4. In the figure, the output end of the piston reverse changeover switch 38 on the first concrete pump 3 side is connected to the output end of the piston reverse changeover switch 38 on the second concrete pump 4 side via a reverse interlock switch 46A. The output end of the valve switch 43 on the first concrete pump 3 side is connected to the output end of the valve switch 43 on the second concrete pump 4 side via a reverse interlock switch 46B. The interlocking switches 46A and 43B for reverse rotation are turned on and off in conjunction with each other.

Regarding the operation of the multiple concrete pump device 1, the individual operations of each concrete pump 3 and 4 will be explained by citing the first concrete pump 3, and then the overall operation will be explained. . In the sequence circuit of FIG. 4, each piston reverse changeover switch 38 of each concrete pump 3, 4, valve switch 4
The following three operations are selected by turning 3 on or off. That is, first, to select normal operation, the piston reverse changeover switch 38 and the valve switch 43 are respectively turned off. Second, to select the piston reverse operation, the piston reverse changeover switch 38 is turned on and the valve switch 43 is turned off. Thirdly, to select valve reverse operation, the piston reverse changeover switch 38 is turned off and the valve switch 43 is turned on.

Instead of normal operation, the multiple concrete pump device 1 is operated in reverse by piston reverse operation or valve reverse operation, but the reason for this is that each concrete This is to cause the fresh concrete in the transport pipe 8 to flow back into the hopper 2 in order to prevent the pumps 3 and 4 from becoming clogged.

[0030] When normal operation is selected, Fig. 3
, as shown in FIG. 4, in the initial state of the first concrete pump 3, the solenoid SV of the main directional control valve 16 is
2 and the solenoid SV4 of the valve operation switching valve 25 are turned on, and one concrete transfer cylinder 9 is turned on.
The concrete piston 9a starts moving forward, and the concrete piston 1 of the other concrete transfer cylinder 10 moves forward.
0a begins to retreat, and the swing pipe 11 communicates with one of the concrete transfer cylinders 9.

From the initial state, solenoids SV2, SV
4 is on, the concrete piston 9a of one concrete transfer cylinder 9 moves forward to complete discharge, and the other concrete transfer cylinder 10
When the concrete piston 10a of the concrete piston 10a of the concrete transfer cylinder 9 retreats to the end and reaches the suction completion state, the first limit switch LS1 captures the most advanced state of the concrete piston 9a of the one concrete transfer cylinder 9, and the first limit switch LS
1 is turned on, and after the solenoids SV1 and SV3 are switched to the on state by the sequence circuit of FIG. 4, they are held in that state.

When the solenoid SV3 is on, oil is supplied from the valve operating hydraulic pump 24A to the valve operating cylinder 11 via the valve operating switching valve 25, and the swing pipe 11
Communication is then switched to the other concrete transfer cylinder 10. On the other hand, when solenoid SV1 is on,
Oil is supplied from the main hydraulic pump 19 to the working chamber 14b at one end of the other hydraulic cylinder 14 via the main directional control valve 16, and the concrete piston 10a of the other concrete transfer cylinder 10 moves forward to discharge fresh concrete. The concrete piston 9a of one of the concrete transfer cylinders 9 moves back and sucks fresh concrete from inside the hopper 2.

Then, with the solenoids SV1 and SV3 on, the other concrete transfer cylinder 10
When the concrete piston 10a of one of the concrete transfer cylinders 9 advances to the furthest point and reaches the discharge completion state, and the concrete piston 9a of one of the concrete transfer cylinders 9 moves back the most to reach the suction completion state, the concrete piston 10a of the other concrete transfer cylinder 10 moves to the farthest position. The forward state is captured by the second limit switch LS2, and the second limit switch LS2
is turned on, and after the solenoids SV2 and SV4 are switched to the on state by the sequence circuit of FIG. 4, the state returns to the same state as the initial state, and that state is maintained.

As mentioned above, from the initial state, the solenoids SV2 and SV4 are turned on → the first limit switch LS
1 is on → Solenoids SV1 and SV3 are on → Second limit switch LS2 is on → Solenoid SV2
, SV4 are turned on, but we will not explain the entire sequence from the sequence circuit of FIG. 4 here.The first limit switch LS1 is turned on and the solenoids SV1 and SV3 are turned on. We will explain only the example sequence that is used. In addition, the second
Solenoid SV2 by limit switch LS2,
The procedure for switching SV4 to the on state is obtained from FIG. 4 in substantially the same way as when the first limit switch LS1 is turned on.

In FIG. 4, concrete pump device 1
During operation, the stop switch 34 of the pumping-off circuit is on and the relay R2 (32) is demagnetized, so the B contact 32A of the relay R2 (32) of the pumping-on circuit is on. (closed state). On the other hand, the pumping switch 33 is turned on, and as a result, the relay R1 (31) of the pumping-on circuit is energized, and the a contact 31A of the relay R1 (31) and the a contact of the relay R1 (31) in the piston switching circuit are energized. 31B is on (closed state). When the stop switch 34 is turned on, relay R2 (32) is energized and its b contact 32A is turned off (
(open state), the relay R1 (31) is demagnetized, the self-holding of the pumping-on circuit is released, and the operation of the multiple concrete pump device 1 is stopped.

Furthermore, during normal operation in which fresh concrete is normally transported by the multiple concrete pump device 1, the piston reverse changeover switch 38 of the piston reverse circuit is turned off, and the relay R5 (37) is demagnetized. , its b contact 37A turns on, and its a contact 37B
is turned off, relay R3 (35) is demagnetized, and
Relay R4 (36) is demagnetized.

First, during normal operation, when the first limit switch LS1 is turned on in the pumping switching circuit, each c contact 36A, 36B of relay R4 (36) is turned on.
Since each of the contact portions of
1, flows to the b contact part of the other c contact 36B of relay R4 (36), flows to relay R7 (40), and then flows to relay R7 (40).
) and relay R8 (41) are excited, and relay R6 (39
) is demagnetized. Therefore, a contact 4 of relay R7 (40)
0A is on and b contact 39 of relay R6 (39)
A is turned off, and the excitation state of relay R8 (41) is self-maintained. As a result, relay R of the piston switching circuit
The a contact part of the c contact 41A of 8 (41) is on, and
The a contact portion of the c contact 41B of the valve switching circuit is turned on.

Therefore, in the piston switching circuit, the current flows from a contact 31B of relay R1 (31) to relay R8.
(41) A contact part of C contact 41A → Relay R3 (35
) flows to the b contact part of the c contact 35B, and the solenoid SV
1 is excited. On the other hand, the valve switch 43 is turned off and the relay R9 (42) is demagnetized. Therefore, each c contact 42 of relay R9 (42) of the valve switching circuit
Each A contact part of A, 42B is off, and in the valve switching circuit, current flows through the A contact part of C contact 41B of relay R8 (41) to the B contact part of C contact 42A of relay R9 (42). It flows to the contact section and excites solenoid SV3.

Second, when piston reverse operation is selected, the piston reverse changeover switch 38 is turned on and the valve switch 43 is turned off. In this case, when the first limit switch LS1 is turned on, the solenoid When SV1 and SV4 are turned on and the second limit switch LS2 is turned on, solenoid SV2
, SV3 is turned on. That is, during piston reverse operation, the solenoids SV1 and SV of the main directional control valve 16
2 operates at the same timing as during normal operation, but the solenoids SV3 and SV4 of the valve operation switching valve 25 operate at the same timing as during normal operation.
It operates at a timing with the phase reversed from that during normal operation. As a result, the operation timing of the swing tube 11 is adjusted to the concrete piston 9a of the concrete transfer cylinders 9, 10.
, 10a are reversed, and fresh concrete is sucked into the concrete transfer cylinder 9 or 10 that moves backward from the transport pipe 8, and then discharged into the hopper 2 from the cylinder 9 or 10 that moves forward. This allows fresh concrete to flow backward from the transport pipe 8 into the hopper 2 to prevent blockage accidents.

Thirdly, when selecting the valve reverse operation, the piston reverse changeover switch 38 is turned off and the valve switch 43 is turned on. Also in this case,
Similarly to the piston reverse operation, when the first limit switch LS1 is turned on, the solenoids SV1 and SV
4 is turned on and the second limit switch LS2 is turned on, solenoids SV2 and SV3 are turned on, causing fresh concrete to flow backward from the transport pipe 8 into the hopper 2, thereby preventing a blockage accident.

Next, the overall operation of the concrete pumps 3 and 4 in conjunction with each other will be explained. In each concrete pump 3, 4, their pair of limit switches LS1
, LS2, the most advanced states of the concrete pistons 9a, 10a in the concrete transfer cylinders 9, 10 are detected, respectively.

The first limit switch LS1 or second limit switch LS2 of each concrete pump 3, 4 captures the most advanced state of the concrete pistons 9a, 10a. The position signal (on) of the first limit switch LS1 or the second limit switch LS2 is transmitted to relay R8 (41) via relay R6 (39) and relay R7 (40), which self-maintains in an energized or demagnetized state. do. The energized or demagnetized state of relay R8 (41) is transmitted as a switching signal to each solenoid SV1, SV2 of the main directional switching valve 16 and each solenoid SV3, SV4 of the valve operating switching valve 25 via its c contacts 41A, 41B. is the first of each concrete pump 3 and 4.
To explain the case where the limit switch LS1 is turned on, if these first limit switches LS1 are not turned on at the same time due to the connection circuit shown in FIG. , current is also applied to the output terminal of the other first limit switch LS1 which is not yet turned on while the concrete piston 9a or concrete piston 10a is moving forward, and therefore, the current is passed through the sequence circuit of FIG. 4 and the connection circuit of FIG. , relay R8 of each concrete pump 3, 4 (
41) at the same time, and this becomes self-maintained in an excited state.

[0043] As a result, the first
The position signal of the limit switch LS1 is transmitted to the solenoid SV1 of the main directional control valve 16 of the first concrete pump 3.
, SV2 as a switching signal, and the second
The switching signal is sent synchronously to the solenoids SV1 and SV2 of the main directional switching valve 16 of the concrete pump 4. Similarly, the position signal is sent as a switching signal to the solenoids SV3 and SV4 of the switching valves 25 in the first concrete pump 3 and the second concrete pump 4 in synchronization.

Therefore, the concrete transfer cylinders 9 and 10 of each concrete pump 3 and 4 operate synchronously, and the valve operating cylinders 12 of each concrete pump 3 and 4 also operate synchronously. Fresh concrete is synchronously transferred from one concrete transfer cylinder 9 or the other concrete transfer cylinder 10 of each concrete pump 3, 4 to a transport pipe 8 via each connecting pipe 5, 6 and discharge branch pipe 7, respectively. Spit out and at the same time,
The other concrete transfer cylinder 10 from inside the hopper 2
Alternatively, fresh concrete is sucked in synchronized with one of the concrete transfer cylinders 9. Further, the swing tubes 11 of the concrete pumps 3 and 4 are switched in synchronization to synchronize the timing of pumping switching.

Then, by repeating these operations, fresh concrete is transferred from each concrete pump 3, 4 to the transport pipe 8.
It is sent in large quantities to the driving site via. In addition, when operating each concrete pump 3, 4 individually, each changeover switch 44, 45 and reverse rotation interlocking switch 4
6A, 46B to cut off communication between the pumping circuits of the first and second concrete pump devices 3, 4, and connect the piston reverse circuit and valve reverse circuit in the first concrete pump 3 with the second pump circuit. Mutual communication with the piston reverse circuit and valve reverse circuit in the concrete pump 4 is established.

According to the above configuration, two concrete pumps 3 and 4 are installed in parallel, and the swing pipe 11 as a flow path switching valve and the concrete transfer cylinders 9 and 10 do not have to have a large diameter. Therefore, large capacity can be achieved. In addition, since existing equipment can be used, there is no need to use special equipment for increasing capacity, and the increase in weight is kept low, and the reaction when switching the swing tube 11 is also kept low.
Loss time due to excessive inertia and switching when switching between sucking and discharging fresh concrete in the concrete transfer cylinders 9 and 10 can be reduced, and a decrease in efficiency can be prevented. As a result, cost reduction can be achieved and can be covered by existing technology.

Furthermore, in this case, the concrete transfer cylinders 9 and 10 of the concrete pumps 3 and 4 can be operated synchronously. Further, the valve actuating cylinders 12 of each concrete pump 3, 4 can be operated synchronously. Therefore, the discharge branch pipe 7
In addition, fresh concrete can be discharged synchronously from the swing pipes 11 of each concrete pump 3, 4, and the concrete transfer cylinders 9, 1 of each concrete pump 3, 4 can be discharged synchronously.
Prevents the backflow of fresh concrete from the swing pipe 11 of the first concrete pump 3 to the swing pipe 11 of the second concrete pump 4 via the discharge multi-branch pipe 7, which occurs when zero synchronization is not performed. can do.

[0048] Then, any concrete pump 3
Even if the amount of oil sealed in the hydraulic cylinders 13, 14 of the concrete pumps 3, 4 changes and the timing at which the limit switches LS1, LS2 are turned on is shifted, the timing of switching between the suction and discharge of fresh concrete in each concrete pump 3, 4 may change. The timing can be matched, and the above-mentioned backflow prevention can be ensured.

Furthermore, the general control device 27 of the multiple concrete pump device 1 uses the position signal sent from the pair of limit switches LS1, LS2 of each concrete pump 3, 4 that reaches the fastest as the switching signal. In the concrete pumps 3, 4 related to the limit switches LS1, LS2 and the other concrete pumps 3, 4, the most advanced state of the concrete pistons 9a, 10a of the concrete transfer cylinders 9, 10 is captured by the limit switches LS1, LS2. Before (while moving forward), the timing of suction and discharge of ready-mixed concrete is switched. Therefore, the stroke lengths of the concrete pistons 9a, 10a of the concrete transfer cylinders 9, 10 of the multiple concrete pump device 1 are shortened, and the problem of the ends of the pistons of the hydraulic cylinders 13, 14 colliding with their cylinder heads is avoided. be able to.

Furthermore, in order to prevent clogging accidents of the concrete pumps 3 and 4, the multiple concrete pump device 1 is operated in reverse to transport fresh concrete from the transport pipe 8 through the discharge branch pipe 7 into the hopper 2. When backflowing, the concrete transfer cylinder 9 of each concrete pump 3, 4,
10 can be synchronized, and the operation of the swing pipes 11 of each concrete pump 3, 4 can also be synchronized, so that the backflow of fresh concrete from the transport pipe 8 can be ensured.

In this embodiment, two concrete pumps are arranged in parallel to increase the capacity, but three or more concrete pumps can also be arranged in parallel. In addition, in this embodiment, a pair of limit switches LS1 of each concrete pump 3, 4
, LS2 respectively, and sends the position signal that reached the fastest as a switching signal to the main direction switching valve 16 of each concrete pump 3, 4 in synchronization, and also switches the valve operation of each concrete pump 3, 4. The general control device 27 that sends data in synchronization with the valves 25 uses a sequence circuit, but instead of the sequence circuit, a computer is used to control the main directional control valves 16, 4 of each concrete pump 3, 4.
It is also possible to synchronize and send switching signals to the switching valve 25 for valve operation.

[0052] In the above embodiment, the first and second concrete pumps 3 and 4 share one hopper 2 and are formed into an integral structure, but each concrete pump has an independent hopper. Of course, it is also good as a structural concrete pump.

[0053]

[Effects of the Invention] As explained above, according to the present invention,
By installing two or more concrete pumps in parallel, a large capacity can be achieved without increasing the diameter of the flow path switching valve or concrete transfer cylinder. In addition, since existing equipment can be used, there is no need to use special equipment to accommodate larger capacity, and the increase in weight is kept low, and the reaction when switching the flow path switching valve is also kept low. It is possible to reduce loss time due to excessive inertia and switching when switching between suction and discharge of fresh concrete in the concrete transfer cylinder, and prevent a decrease in efficiency. As a result, cost reduction can be achieved, and fresh concrete can be transported effectively by combining a plurality of existing concrete pumps.

Furthermore, in this case, the multiple concrete pump device receives position signals from the pair of position detection means for each concrete pump, and uses the position signal that reaches the fastest as a switching signal to switch the main direction of each concrete pump. Since it has a control means that sends the concrete in synchronization with the valve and also in synchronization with the valve operation switching valve of each concrete pump, the concrete transfer cylinders of each concrete pump can be operated in synchronization with each other. Also,
The valve actuation cylinders of each concrete pump can be operated synchronously. Therefore, fresh concrete can be discharged synchronously from the flow path switching valves of each concrete pump to the discharge multi-branch pipe, and if the concrete transfer cylinders of each concrete pump are not synchronized, for example, one concrete pump The ready concrete can be transported smoothly and reliably by preventing backflow of fresh concrete from the flow route switching valve of the concrete pump to the flow route switching valve swing pipe of another concrete pump via the discharge multi-branch pipe.

[0055] Even if the amount of oil sealed in the hydraulic cylinder of any of the concrete pumps changes and the timing at which the position signal of the position detection means is sent is shifted, the switching between suction and discharge of fresh concrete in each concrete pump is not possible. The timings can be matched, and the above-mentioned backflow prevention can be ensured. In addition, since the control means of the multiple concrete pump device uses the position signal sent from the pair of position detection means of each concrete pump that reaches the fastest as the switching signal, the concrete pump related to the position detection means and another concrete In the pump, before the position detecting means detects the forward or backward state of the piston of the concrete transfer cylinder,
The timing of suction and discharge of fresh concrete is switched. Therefore, the stroke length of the piston of the concrete transfer cylinder of the multiple concrete pump device is shortened, and it is possible to avoid the problem of the end of the piston of the hydraulic cylinder colliding with its cylinder head.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a multiple concrete pump device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the concrete pump of the multiple concrete pump device.

FIG. 3 is a control system diagram of the multiple concrete pump device.

FIG. 4 is a sequence circuit diagram of the concrete pump of the multiple concrete pump device.

FIG. 5 is a connection circuit diagram of sequence circuits in both concrete pumps of the multiple concrete pump device.

FIG. 6 is a connection circuit diagram between a piston reverse circuit and a valve reverse circuit of the sequence circuits of both concrete pumps of the same multiple concrete pump device.

[Explanation of symbols]

1 Multiple concrete pump device 2 Hopper 3 First concrete pump 4 Second concrete pump 7 Discharge multi-branch pipe 8 Transport pipes 9, 10 Concrete transfer cylinders 9a, 10a
Concrete piston 11 Swing pipe 12 Valve actuation cylinders 13, 14 Hydraulic cylinder 27 General control device (control means) 28 Control device

Claims (1)

[Claims] [Claim 1] A hopper for charging fresh concrete;
a pair of concrete transfer cylinders that suck in and discharge fresh concrete in the hopper with a piston;
A flow path switching valve driven by a valve actuation cylinder to alternately connect one of the pair of concrete transfer cylinders to the transport pipe, connect the other to the hopper, and vice versa. a pair of hydraulic cylinders that move pistons in the pair of concrete transfer cylinders forward and backward; a main directional control valve connected to the pair of hydraulic cylinders; and a valve actuation switching valve connected to the valve actuation cylinder. Two or more concrete pumps are arranged in parallel, and the inlet end communicates with the discharge port of each flow switching valve, and the outlet end is connected between the flow switching valve of each concrete pump and the transport pipe. A multi-branch discharge pipe communicating with the connection port of the transport pipe is arranged, and a pair of position detection means for detecting the forward or backward state of the piston is provided on both concrete transport cylinders of each concrete pump, respectively. A position signal is received from each of the pair of position detection means, and the position signal that reaches the fastest is sent as a switching signal in synchronization with the main direction switching valve of each concrete pump, and is also synchronized with the valve operation switching valve of each concrete pump. A multiple concrete pump device characterized by having a control means for sending concrete.