JPH066809B2 - Control device for earth and sand pumping equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device for automatically performing a sequential operation of a sediment feeding device.

Sediment to be pumped is temporarily stored in the sediment tank, and toward the sediment pump pipe provided on one side of the sediment tank, advance the cylindrical isolation device provided on the other side of the sediment tank, Sediment is taken into the inside of this isolation device, and the space between the sediment reservoir tank and the sediment delivery pipe is isolated,
Next, a piston for soil and sand pressure feed is advanced along the inside of the segregation device, the sediment taken into the segregation device is pushed into the sand and sand pressure feed pipe, the isolation device is retracted, and then the piston for soil and sand pressure feed is retracted. A sediment feeding device has been proposed by the applicant of the present invention.

An object of the present invention is to provide a control device capable of automatically and surely performing a sequential operation of an isolation device for isolating a sediment storage tank and a sediment delivery pipe and a piston for the sediment delivery in the sediment delivery device. There is.

The feature of the present invention is that first detection means for detecting the end of forward movement of the piston for soil and sand feeding, second detection means for detecting the end of backward movement of the piston for soil and sand feeding, and the first detection means. A signal to switch the directional control valve of the fluid pressure operating unit to a position for retracting the isolation device, and a signal from the second detection means to switch the directional control valve to a position to advance the isolation device. It is in the structure, and the above-mentioned object can be certainly achieved by this structure.

The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the earth and sand pumping apparatus to which the present invention is applied, FIG. 2 shows a part of it in an enlarged scale, and FIGS. 3 and 4 show an embodiment of the present invention. Drawing-Drawing 7 show sequential operation of the outer cylinder as an isolation device, and the piston for earth and sand pumping.

As shown in FIG. 1, the earth and sand pumping device includes a sand reservoir tank 1, an oil tank 6, a earth and sand pressurizing pipe 8, a casing 13, an outer cylinder 18 as a cylindrical separating device, a piston 19 for pushing the outer cylinder, Stopper 28 of this, inner cylinder 2
9, a piston 30 for earth and sand pressure feed, a piston 31 for pushing the inner cylinder, a stopper 35 of the piston 31, a fluid pressure operation portion for operating the outer cylinder 18 and the piston 30 for earth and sand pressure feed.

The earth and sand reservoir tank 1 is supplied with the earth and sand 100 conveyed by a conveyor (not shown) or the like from the upper opening 2, and the earth and sand 100 is temporarily accumulated in the earth and sand reservoir tank 1. ing. In addition, a sediment inlet 3 is set inside the sediment tank 1.

The oil tank 6 is installed on the side wall 4 side of the earth and sand tank 1, and the lubricating oil 101 for lubricating the sliding surface of the outer cylinder 18 is housed inside the oil tank 6.

The sediment feeding pipe 8 is arranged on one side of the sediment inlet 3, and is attached to the front wall 4 by sandwiching a seal casing 10 between the front wall 4 of the sediment tank 1 and the mounting flange 9. Has been. A seal member 11 is interposed in the seal casing 10 on the side of the earth and sand suction port 3, and the seal member 11 is fixed by a stop ring 12.

The casing 13 has a U-shaped cross section, a first port 14 is provided on the rear wall, and a second port 15 is provided on the body. Further, the casing 13 is attached to the rear wall 7 of the oil tank 6 via an attachment member 16.

The outer cylinder 18 is arranged on the other side of the earth and sand suction port 3 and is installed on the same axis as the earth and sand pumping pipe 8. The front end of the outer cylinder 18 is slidably supported by a support member 17 fixed to the rear wall 5 of the sediment tank 1, and the rear end of the outer cylinder 18 is pushed through a piston 19 for pushing the outer cylinder. It is slidably incorporated inside the casing 13.

Between the rear end surface of the piston 19 for pushing the outer cylinder and the inner surface of the rear wall of the casing 13, a fluid pressure chamber 20 for pushing the piston 19 in the forward direction is formed, and the outer periphery of the outer cylinder 18 and the casing 13. A fluid pressure chamber 21 that pushes the piston 19 in the backward direction is formed between the inner circumferences. Also, the piston 19
A set of fluid pressure passages 22 and 23 and another fluid pressure passage 26 are provided on the inner side of the piston 19.
A hollow guide member 27 facing inside is attached. The fluid pressure passages 22 and 23 are, as shown in FIG.
It is designed to be opened and closed by the 24, and the spool 24
In this embodiment, the operation of the throttle 25 provided in the fluid pressure passage 22 ensures reliable operation. The throttle 25 may be provided in the fluid pressure passage 23. Further, the fluid pressure passage 26 communicates with a hollow guide member 27.

The stopper 28 of the piston 19 for pushing the outer cylinder,
It is incorporated and fixed to the end of the casing 13 and the inside of the mounting member 16.

The inner cylinder 29, the piston 30 for feeding earth and sand, and the piston 31 for pushing the inner cylinder are integrally slidable in the outer cylinder 18. A fluid pressure chamber 32 for pushing the inner cylinder pushing piston 31 in the forward direction is formed between the rear end surface of the inner cylinder pushing piston 31 and the front end surface of the outer cylinder pushing piston 19. ,
A fluid pressure chamber 33 for pushing the piston 31 in the backward direction is formed between the outer circumference of the inner cylinder 29 and the inner circumference of the outer cylinder 18. An inner chamber 29 ′ of the inner cylinder 29 and a piston for pushing the inner cylinder are provided near the rear end of the inner cylinder 29.
Fluid pressure hole 34 that connects fluid pressure chamber 33 that pushes 31 backward
Is provided. The piston 31 is a guide member.
It is supposed to move along 27.

The stopper 35 of the piston 31 for pushing the inner cylinder,
The outer cylinder 18 is attached to a substantially middle portion in the axial direction.

In this embodiment, a hydraulic circuit is used for the fluid pressure operation unit. As shown in FIG. 3, this hydraulic circuit serves as an oil tank 36, an electric motor 37, an oil pump 38, a relief valve 41 connected between an oil passage 39 on the forward side and an oil passage 40 on the return side, and as a directional valve. 3 position solenoid valve (hereinafter referred to as a solenoid valve) 42, the first and second ports connecting the A and B ports of the solenoid valve 42 with the first and second ports 14 and 15 provided in the casing 13. Oil passage
It has 43 and 44. And the solenoid of the solenoid valve 42
42a and 42b are inserted in an electric circuit as a means for switching a directional control valve described later.

As shown in FIG. 3 and FIG. 4, the control device of the earth and sand pumping device is provided with first and second detecting means provided in the first and second oil passages 43 and 44 of the hydraulic circuit. 1, a second hydraulic pressure detector 45, 46, and an electric circuit as a means for switching the directional control valve.

As the first and second hydraulic pressure detectors 45 and 46, strain gauge type ones are used. The first oil pressure detector 45
Is, as shown in FIG. 3, B of the solenoid valve 42 of the hydraulic circuit.
Port and first port 14 of sediment pumping device casing 13
A first amplifier 47 is connected to the first hydraulic pressure detector 45, and a first electric signal detector 49 is connected to the first amplifier 47. This first
The electric signal detector 49 of is inserted in the electric circuit. On the other hand, as shown in FIG. 3, the second oil pressure detector 46 connects the second port 15 of the solenoid valve 42 of the hydraulic circuit with the second port 15 of the casing 13 of the earth and sand pumping device. A second amplifier is provided on the line 44 and this second oil pressure detector 46 has a second amplifier.
A second electric signal detector 50 is connected to the second amplifier 48, and the second electric signal detector 50 is inserted in the electric circuit.

As shown in FIG. 4, the electric circuit for switching the solenoid valve 42 includes a start push button switch (hereinafter referred to as a start switch) 51, an operation stop push button switch (hereinafter referred to as a stop switch) 52, and a 1 electrical signal detector 49
A contact 53 closed by an electric signal from the coil 55
Circuit connected in series, an a contact point 54 closed by an electric signal from the second electric signal detector 50, a circuit in which a coil 56 is connected thereto in series, and two a contact points 5 in the starting switch 51.
7 and 59 are connected in parallel, and two b contacts 6 are connected to this parallel circuit.
1 and 63 are connected in series, and these two b contacts 61 and 6 are also connected.
A circuit in which a series coil 65 is connected to 3, and two a contacts 58, 6
0 is connected in parallel, and two b contacts 62, 64 are connected to this parallel circuit.
Are connected in series, and a coil 66 is connected to these two b contacts 62 and 64.
Are connected in series, a circuit having an a contact 67 for energizing the solenoid 42a of the solenoid valve 42, and a circuit having an a contact 68 for energizing the solenoid 42b of the solenoid valve 42. Then, when the start switch 51 is put in, the coil 65 is excited, the a contact 67 is closed by the coil 65, and the solenoid 42a of the solenoid valve 42 is energized.
Is switched from the neutral position shown in FIG. 3 to the I position. Then, when the a-contact 53 is closed by the electric signal from the first electric signal detector 49, the coil 55 is excited, and when the coil 55 opens the b-contact 61 and the a-contact 58, the coil 66 is closed. Is energized, the a contact 68 is closed by this coil 66, the solenoid 42b of the solenoid valve 42 is energized, and the solenoid valve 42 is switched to the II position in FIG. Then, the a contact 54 is closed by the electric signal from the second electric signal detector 50, the coil 56 is excited, and the coil 56 b
When the contact 62 is opened and the a-contact 57 is closed, the coil 65 is excited, the a-contact 67 is closed by the coil 65, and the solenoid 42a of the solenoid valve 42 is energized.
Is configured to be switched to the I position in FIG. When the operation stop switch 52 is pushed open,
The contacts 63 and 64 are opened, the coils 65 and 66 are demagnetized, and the a contact
67 and 68 are opened, and the solenoid valve 42 is switched to the neutral position by the action of the spring.

Next, the operation of the earth and sand pumping device and the control device therefor of the embodiment will be described.

First, the start switch 51 of the electric circuit for switching the solenoid valve 42.
When the switch is turned on, the coil 65 is excited, the a contact 67 is closed by the coil 65, the solenoid 42a of the solenoid valve 42 is energized, and the solenoid valve 42 is switched to the I position. as a result,
The first oil passage 43 → the first port 14 → the pressure oil is supplied to the fluid pressure chamber 20 which pushes the piston 19 for pushing the outer cylinder in the casing 13 in the forward direction. The pushing piston 19 is pushed in the forward direction, and the outer cylinder 18 as a cylindrical isolator advances ahead of the earth and sand pressure feeding piston 30.

Then, the outer cylinder 18 takes in the sediment 100 in the vicinity of the sediment suction port 3 of the sediment tank 1 at the time of forward movement, and the tip portion 1 thereof
When 8 ′ comes into close contact with the seal member 11, the piston 19 for pushing the outer cylinder abuts the stopper 28. As a result, as shown in FIG. 5, the earth and sand reservoir tank 1 and the earth and sand pumping pipe 8 are separated by the outer cylinder 18. Meanwhile, the pressure oil in the fluid pressure chamber 21 is discharged through the second port 15.

While the outer cylinder 18 moves forward and the piston 19 for pushing the outer cylinder abuts on the stopper 28, the spool 24 abuts on the stopper 28 and is pushed rearward.
2 and 23 communicate. As a result, pressure oil is supplied to the fluid pressure chamber 20 → the fluid pressure passages 22 and 23 → the fluid pressure chamber 32 that pushes the piston 31 for pushing the inner cylinder. The cylinder pushing piston 31 is pushed forward, the earth and sand pressure feeding piston 30 is moved forward along the inside of the outer cylinder 18 through the inner cylinder 29, and the earth and sand 100 inside the outer cylinder 18 is moved by the earth and sand feeding piston 30.
Is pushed into the earth and sand pressure feeding pipe 8 and pressure fed.

At the time when the sand 100 is pumped, as shown in FIG. 7, the piston 31 for pushing the inner cylinder abuts the stopper 35,
The movement of the piston 30 for soil and sand feeding in the forward direction is stopped.

Along with this, the hydraulic pressures of the fluid pressure chamber 20, the first port 14, and the first oil passage 43 increase. When this oil pressure becomes equal to or higher than the set pressure, it is detected by the first oil pressure detector 45, the detection result is amplified by the first amplifier 47, and then input to the first electric signal detector 49, where the first electric signal is detected. Signal detector 49
An electric signal from the electric circuit causes the a contact 53 of the electric circuit for switching the solenoid valve 42 to be closed.

When the a-contact 53 of the electric circuit is closed, the coil 55 is excited, the b-contact 61 is opened by the coil 55 and the a-contact 58 is closed, whereby the coil 66 is excited and the a-contact of the coil 66 is generated. 68 closed, solenoid valve 42
The solenoid 42b is energized and the solenoid valve 42 is switched to the II position.

When the solenoid valve 42 is switched to the II position, the second oil passage
44 → second port 15 → pressure oil is supplied to the fluid pressure chamber 21 that pushes the piston 19 for pushing the outer cylinder in the casing 13 in the backward direction, and the spool is driven by the hydraulic pressure on the side of this fluid pressure chamber 21.
24 moves rearward, the space between the fluid pressure passages 22 and 23 is closed, and the oil pressure of the pressure oil supplied to the fluid pressure chamber 21 pushes the outer cylinder pushing piston 19 in the backward direction to move the outer cylinder. 18 is retracted.

As a result, the outer cylinder 18 can be automatically and surely moved in the backward direction after the forward movement of the soil and sand pressure feeding piston 30 is completed.

Meanwhile, the pressure oil in the fluid pressure chamber 20 is discharged through the first port 14.

When the piston 19 for pushing the outer cylinder is pushed in the backward direction, it comes into contact with the rear wall of the casing 13 and stops moving, and the spool 24 also comes into contact with the rear wall of the casing 13 and is pushed forward, so that the fluid The pressure passages 22 and 23 communicate with each other.

Then, from the fluid pressure chamber 21 to the fluid pressure passage 26 → guide member
The inside of 27 → the inner chamber 29 ′ of the inner cylinder 29 → the fluid pressure hole 34 → pressure oil is supplied to the fluid pressure chamber 33 that pushes the piston 31 for pushing the inner cylinder in the backward direction, and the oil pressure pushes the inner cylinder The advancing piston 31 is pushed in the backward direction, and the earth and sand pressure-feeding piston 30 is moved backward through the inner cylinder 29.

When the sediment suction port 3 in the sediment storage tank 1 is opened due to the retreat of the outer cylinder 18 and the piston 30 for sediment transport, the sediment 100 is fed into the sediment suction port 3 again.

As described above, when the piston 19 for pushing the outer cylinder abuts against the rear wall of the casing 13 and stops moving, the hydraulic pressure in the fluid pressure chamber 21, the second port 15 and the second oil passage 44 is reduced. To rise. When this oil pressure exceeds the set pressure, it is detected by the second oil pressure detector 46, and the detection result is the second amplifier 48.
Is amplified by and input to the second electric signal detector 50,
The electric signal from the second electric signal detector 50 closes the a contact 54 of the electric circuit.

When the a-contact 54 of the electric circuit is closed, the coil 56 is excited, and the coil 56 opens the b-contact 62 and closes the a-contact 57, thereby exciting the coil 65. Then, the a contact 67 is closed by this coil 65,
The solenoid 42a of the solenoid valve 42 is energized, the solenoid valve 42 is switched to the I position again, and as described above, the pressure oil is pushed to push the outer cylinder pushing piston 19 in the forward direction through the first oil passage 43. Is supplied.

Therefore, after the outer cylinder 18 has been retreated, the outer cylinder 18 can be automatically and reliably moved in the forward direction prior to the forward movement of the soil and sand feeding piston 30.

By repeating the above sequence of operations, the sediment 100 in the sediment reservoir 1 can be automatically sent out through the sediment feeding pipe 8.

In the present invention, the first detecting means for detecting the end of forward movement of the piston 30 for earth and sand feeding and the second detecting means for detecting the end of backward movement of the outer cylinder 18 as the isolation device are not limited to hydraulic pressure detectors. The means for switching the directional control valve in response to the signals from the first and second detecting means is not limited to the electric circuit shown in the drawings, and any means may be used as long as it has a desired function.

According to the present invention described above, the first detection means detects the end of the advance of the piston for soil and sand pressure feeding, and the first detection means by means for switching the direction switching valve of the fluid pressure operation unit of the earth and sand feeding device. Switching the directional control valve to a position for retracting the isolation device based on a signal from
The second detecting means detects the end of the backward movement of the earth and sand pressure feeding piston, and the means for switching the directional switching valve causes the directional switching valve to operate on the basis of the signal from the second detecting means.
Since the separating device is switched to the position for advancing, there is an effect that the desired sequential operation of the earth and sand pumping device can be automatically and reliably performed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of an earth and sand pumping apparatus to which the present invention is applied, FIG. 2 is an enlarged side view of a portion of the earth and sand pumping apparatus around a spool and a fluid pressure passage, and FIG. 3 is a direction switching valve. Showing a hydraulic circuit as a fluid pressure operating unit including an electromagnetic valve as an example, FIG. 4 shows an electric circuit as means for switching the directional control valve, and FIGS. 5, 6 and 7 show earth and sand. It is explanatory drawing of the order operation | movement of the operation member of a pumping apparatus. DESCRIPTION OF SYMBOLS 1 ... Sediment storage tank, 8 ... Sediment feeding pipe, 13 ... Casing, 14, 15 ... 1st, 2nd port, 18 ... Outer cylinder as an isolation device, 19 ... Piston for pushing outer cylinder, 20, 21 ... Fluid pressure chamber, 28 ... Stopper of piston for pushing outer cylinder, 29 ... Inner cylinder, 30 ... Piston for pushing earth and sand, 31 ... Piston for pushing inner cylinder, 32, 33
... Fluid pressure chamber, 35 ... Stopper of piston for pushing inner cylinder, 36-44 ... Member constituting hydraulic circuit as fluid pressure operation unit, 42 ... Solenoid valve as direction switching valve, 45, 46 ... First , A hydraulic pressure detector as the second detecting means, 51 to 68 ... Members constituting an electric circuit as means for switching the directional control valve.

Front page continuation (72) Inventor Yoshiyuki Iwai 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Public Company (72) Inventor Takaaki Fukumoto 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone public office (72) Inventor Kiyoshi Tsuchiya 650 Kazunachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd.Tsuchiura factory (72) Inventor Yoshiya Nagano, 650 Kintate-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd., Tsuchiura Plant 72) Inventor Naoki Miyanagi, 650 Kintate-cho, Tsuchiura City, Ibaraki Prefecture, Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. (56) References JP 59-51171 (JP, A) JP 60-23531 (JP, A) Actual development Sho 60-122578 (JP, U)

Claims (2)

[Claims] 1. A cylindrical isolation device provided on the other side of the sand storage tank by a fluid pressure operation unit including a direction switching valve, facing the sand delivery pipe provided on one side of the sand storage tank. , The soil was taken into the inside of this isolation device, the space between the sand storage tank and the sand feeding pipe was isolated, and then the piston for the sand feeding was advanced along the inside of the isolation device and taken into the isolation device. After pushing the earth and sand into the earth and sand pressure feeding pipe, the isolation device is retracted, and then the earth and sand pressure feeding piston is retracted, in the earth and sand pressure feeding device, a first detection means for detecting the end of the advance of the earth and sand pressure feeding piston. , A second detecting means for detecting the end of the backward movement of the piston for feeding the earth and sand, and a signal from the first detecting means for causing the directional control valve of the fluid pressure operating section to move the isolation device backward. It switched to the position to, and the second
And a means for switching the directional control valve to a position for advancing the isolation device according to a signal from the detecting means. 2. The first and second detecting means are configured to detect pressure and convert the pressure into an electric signal, and the means for switching the directional control valve is provided by the first and second detecting means. The control device for the earth and sand pumping device according to claim 1, wherein the control device is an electric circuit that operates based on an electric signal.