JPH0617170B2 - Horizontal hydro hoist - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a horizontal hydrohoist, and more particularly to a horizontal hydrohoist having an opening / closing time schedule such as a switching valve, which is suitable for slurry transportation with strong abrasion. is there.

[Background of the Invention]

A horizontal hydrohoist in which a solid material is mixed with water to form a slurry and hydraulically transported is described in, for example, Japanese Utility Model Publication No. 4-4755.

The outline of the apparatus will be described with reference to FIGS. 3 and 4.

FIG. 3 is a schematic configuration diagram of a general horizontal hydrohoist, and FIG. 4 is a vertical sectional view of the switching valve.

In FIG. 3, 7 is a plurality of (generally three) supply pipes, 8 is a high-pressure driven fresh water pump, 12 is a fresh water pipe, and 9 is a pipe.
Is a slurry transport pipe, 5 is a mixing tank for mixing a solid substance to be transported with water to form a slurry, 6 is a low-pressure slurry pump for sending the slurry to a supply pipe 7, 1
Reference numeral 3 is a slurry pipe, and 14 is a return clear water pipe discharged from the supply pipe 7 when the slurry is filled in the supply pipe 7.

Reference numerals 1-1, 1-2, 1-3 (generally referred to as 1) send the driving fresh water to the supply pipes 7, so that the first switching valves respectively arranged at the start ends of the three supply pipes 7, 2-1, 2-2, 2-
3 (generally 2) sends the slurry from the supply pipes 7 to the transport pipes, so that the second switching valves 3-1 and 3-2 respectively provided at the end portions of the three supply pipes 7 are provided. 3-3 (generally 3) is a third switching valve connected to the start ends of the three supply pipes 7 in order to send the slurry to the supply pipes 7.
-1, 4-2, 4-3 (collectively 4) are connected to the end portions of the three supply pipes 7 in order to discharge fresh water from the supply pipe 7 when the supply pipe 7 is filled with the slurry. This is the fourth switching valve.

Slurry and driving fresh water are alternately charged into and discharged from the supply pipe 7 through the respective switching valves, and the slurry is hydraulically transported to the destination by being pumped through the transport pipe 9.

In the device described in Japanese Utility Model Publication No. 42-4755, in the slurry pipe 13 between the third switching valve 3 and the slurry pump 6, immediately before the third switching valve 3, the operation valve 11-1 is provided. , 11-2, 11-3 (collectively 11) are connected to a plurality of fresh water injection pipes 10, and each operation valve 11 is connected to
The third switching valve 3 is interlocked so that it opens when the third switching valve 3 is closed.

According to this, by injecting fresh water immediately before the third switching valve 3 and replacing the vicinity of the switching valve 3 with fresh water, it is possible to prevent the valve from being worn to some extent.

The switching valve is a plate valve shown in FIG.

In FIG. 4, 15 is a valve plate, 15a is a flow hole provided in the valve plate 15, 16 is a valve seat, 17 is a valve spindle connected to the valve plate 15, 18 is a piston for moving the valve spindle 17 up and down, 19 is a hydraulic cylinder.

The pressure oil from the hydraulic device operates the valve spindle 17 via the piston 18 to move the valve plate 15 up and down, and when the valve is opened, the flow passage 20 of the valve seat 16 and the flow hole 15a of the valve plate 15 are opened. (The right half of FIG. 4), and when the valve is closed, the valve plate 15 blocks the flow passage 20 (the left half of FIG. 4).

Therefore, according to the operation of the operation valve 11 described above, the closing of the third switching valve 3 that opens and closes in the slurry, the opening of the fourth switching valve 4 for return water, and the injection of fresh water are performed. Since the opening of the operation valve 11 is started at the same time, the slurry between the fresh water inlet and the third switching valve 3 is discharged to the edge portion of the valve plate 15 and the valve seat 16 of the third switching valve 3 which has started to close. Since the fourth switching valve 4 starts to open when the third switching valve 3 starts to open due to contact wear, the slurry is not completely absorbed by the third switching valve 3 before the third switching valve 3 is completely opened. The point of reaching the valve plate 15 and causing wear of the valve plate 15 and the valve seat 16 has not been sufficiently considered.

[Object of the Invention]

The present invention has been made in order to solve the above-mentioned problems of the prior art. Due to the function of the horizontal hydrohoist, the life of the third switching valve that is always opened and closed in the slurry is extended, and particularly when the valve is opened and closed. An object of the present invention is to provide a horizontal hydrohoist capable of preventing damage caused by biting of solid matter in the slurry and abrasion damage caused by collision of the slurry with a valve plate and a valve seat during valve opening and closing.

[Outline of Invention]

The configuration of the horizontal hydrohoist according to the present invention includes a plurality of supply pipes arranged in parallel, and a plurality of first to fourth switches for switching filling and discharging of the slurry and the driving fresh water which are alternately supplied to these supply pipes. Switching valve, a slurry pump and a slurry pipe for filling the supply pipe with the slurry via the third switching valve, and the slurry filling the supply pipe for the first and second
A drive fresh water pump and a fresh water pipe for sending out to the transport pipe via the second switching valve, and a return fresh water pipe discharged through the fourth switching valve when the slurry is filled in the supply pipe, In the horizontal hydrohoist, a plurality of fresh water injection pipes each having an operation valve are connected immediately after the plurality of third changeover valves in the slurry pipe between the changeover valve No. 3 and the slurry pump. When the switching valve is closed, the corresponding fourth switching valve is closed first, and when the third switching valve is opened, the corresponding fourth switching valve is opened earlier than the corresponding fourth switching valve, and the fourth switching valve is closed. A control device having a time schedule for opening the operation valve at a timing and injecting fresh water into the third switching valve is provided, and the control is performed by this.

The concept of developing the present invention is as follows.

Due to the function of the horizontal hydrohoist, the third switching valve 3 is a valve that opens and closes in the slurry, and extending the life of the third switching valve 3 is an important issue.

It is considered that the valve wear can be prevented to some extent by injecting fresh water immediately before the third switching valve 3 and replacing the vicinity of the third switching valve 3 with fresh water, but with this alone, the life time is 500 to 800 hours. There is a need for a more effective cleaning method in order to reach the target of 3,000 hours or more expected by consumers. When the third switching valve 3 and the fourth switching valve 4 are interlocked with each other as in the conventional case, during the operation time of the opening and closing of the third switching valve 3, the slurry becomes the valve plate 15 shown in FIG. It was thought that this would cause a large factor in valve wear, and it was necessary to open and close the third switching valve 3 in still fresh water.

Therefore, fresh water is injected immediately before the third switching valve to
Clean the inside of the pipe before and after the switching valve, further close the corresponding fourth switching valve when the third switching valve is closed, and the corresponding fourth switching valve when the third switching valve is opened. By opening before the valve, the valve can be opened and closed in static fresh water, preventing damage due to biting of solid matter when opening and closing the valve and abrasion damage due to collision of slurry with the valve plate and valve seat during valve opening and closing, The idea is to extend the life.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 5 in combination with FIGS.

FIG. 1 is a time schedule chart of the operation of the horizontal hydrohoist according to the embodiment of the present invention, and FIG.
FIG. 5 is an operation im schedule chart of a conventional horizontal hydrohoist, which is shown in comparison with the embodiment of the present invention. FIG. 5 is a control system diagram for performing operation according to the time schedule of FIG. .

The arrangement and configuration of the main components of the horizontal hydrohoist of this embodiment are the same as those of the third conventional device, and the time schedule of valve opening and closing is different from the conventional one. In the figure, the same parts are designated by the same reference numerals. There is.

Note that FIG. 1 shows a time schedule for opening and closing each valve of three systems arranged corresponding to each of a plurality of supply pipes 7 (here, three), and FIG. Only one system is compared for comparison.

As shown in FIG. 1, the time from the opening point S1 of the third switching valve 3-1 to the opening point S2 of the third switching valve 3-1 is the valve opening time.

The time T1 from the point S2 when the opening of the third switching valve 3-1 ends to the point S3 when the opening of the fourth switching valve 4-1 starts becomes the waiting time, and the flow has stopped until then. .
(A flow occurs in the pipe only after the fourth switching valve 4-1 starts to open.) That is, the third switching valve 3-1 can be opened in static fresh water.

Next, the time from the point ○ 2 at the beginning of closing of the fourth switching valve 4-1 to the point ○ 3 at the end of closing is the valve closing time. The time T2 from the point ○ 3 at which the fourth switching valve 4-1 is closed to the point ○ 1 at which the third switching valve 3-1 is started to be closed is the waiting time, and the third switching valve 4-1 is closed. At the end point ○ 3, the flow will stop.

That is, the third switching valve 3-1 can be closed in static fresh water.

Next, the injection of fresh water immediately before the third switching valve 3-1 is interlocked with the closing start timing of the fourth switching valve 3-1
-1 is opened and closed to make the vicinity of the third switching valve 3-1 to be clean water.

The opening / closing timing of each valve of each system of No. 2 and No. 3 will be performed as shown in FIG. 1 according to the above.

On the other hand, the time schedule for the operation of the conventional horizontal hydrohoist was as shown in FIG.

That is, the third switching valve 3-1 and the fourth switching valve 4-1 are simultaneously opened, and the third switching valve 3-1 and the fourth switching valve 4-1 are connected.
And the operation valve 11-1 were opened at the same time.

The characteristics of the timing of the valve operation of this embodiment are clear by comparing the portions surrounded by the two-dot chain line in FIGS.

Next, a control mechanism in which each valve operates according to the time schedule shown in FIG. 1 will be described with reference to the system diagram shown in FIG.

In FIG. 5, 21 is a control device for controlling the sequence 21a in which the time schedule of FIG.
2 is a hydraulic device for sending pressure oil to each switching valve and operation valve,
Reference numeral 23 is a hydraulic electromagnetic switching valve.

The time schedule shown in FIG. 1 is stored in the control device 21, and the opening / closing command signal F is supplied from the control device 21 to each switching valve and operation valve.

The time schedule stored in the control device 21 is
For example, by repeating one cycle, the timing of opening and closing each valve in one cycle is set by a timer, and so-called sequence control is performed.

The opening / closing command signal F is sent as an electric signal to the solenoid portion of the hydraulic electromagnetic switching valve 23 connected to the hydraulic cylinder 19 of each valve, and the hydraulic cylinder 19 is switched by switching the flow direction of the hydraulic pressure sent from the hydraulic device 22. Piston 1
8 moves up and down, and the valve body 15 directly connected to the piston 18 via the valve spindle 17 moves up and down to open and close the valve.

According to this embodiment, when the third switching valve 3 is closed, the corresponding fourth switching valve 4 has finished closing and the flow is stopped,
Even when the third switching valve 3 is opened, the flow before the opening of the fourth switching valve 4 is performed while it is stationary, and it becomes possible to open and close the third switching valve 3 in static fresh water. It is possible to prevent the valve plate 15 and the valve seat 16 from being damaged or worn due to the collision of the slurry during the valve opening / closing operation.

Only by injecting fresh water immediately before the third switching valve 3, the life of the valve reached 500 to 800 hours. However, the valve opening / closing operation of this embodiment can extend the valve life to 3000 hours or more.

In addition, in the above-mentioned embodiment, the example of the sequence control using the timer for the opening and closing time schedule of each valve is described, but the control means of the present invention is not limited to this, and an arithmetic control device such as a microcomputer is used. It goes without saying that it may be controlled.

〔The invention's effect〕

As described above, according to the present invention, due to the function of the horizontal hydrohoist, the life of the third switching valve that is constantly opened and closed in the slurry is extended, and in particular, when the valve is opened and closed, the solid matter in the slurry is trapped. It is possible to provide a horizontal hydrohoist capable of preventing damage due to the above and wear damage due to collision of the slurry with the valve plate and valve seat during valve opening and closing.

[Brief description of drawings]

FIG. 1 is a time schedule yuir chart for operation of a horizontal hydro hoist according to an embodiment of the present invention, FIG. 2 is a time schedule yur chart for operation of a conventional horizontal hydro hoist, and FIG. 3 is a general horizontal hydro hoist. FIG. 4 is a schematic configuration diagram of the hoist, FIG. 4 is a vertical cross-sectional view of the switching valve, and FIG. 5 is a control system diagram for operating with the time schedule of FIG. 1, 1-1, 1-2, 1-3 ... First switching valve, 2, 2
-1,2-2,2-3 ... 2nd switching valve, 3,3-1,
3-2, 3-3 ... third switching valve, 4,4-1,4-
2, 4-3 ... Fourth switching valve, 5 ... Mixing tank, 6 ...
... Slurry pump, 7 ... Supply pipe, 8 ... Driving fresh water pump, 9 ... Transport pipe, 10 ... Clean water injection pipe, 11,11-
1, 11-2, 11-3 ... Operation valve, 12 ... Fresh water pipe, 13 ... Slurry pipe, 14 ... Return fresh water pipe,
15 ... Valve plate, 16 ... Valve seat, 18 ... Piston, 19
... hydraulic cylinder, 20 ... flow passage, 21 ... control device, 21a ... sequence, 22 ... hydraulic device, 23 ...
… Hydraulic electromagnetic switching valve.

Claims (1)

[Claims] 1. A plurality of supply pipes arranged in parallel, a plurality of first to fourth switching valves for switching filling and discharging of slurry and driving fresh water which are alternately supplied to these supply pipes, and Three
Slurry pump and slurry pipe for filling the supply pipe with the slurry via the switching valve, and a drive fresh water pump and fresh water for sending the slurry filled in the supply pipe to the transport pipe through the first and second switching valves. A plurality of pipes in the slurry pipe between the third switching valve and the slurry pump, the pipe and return fresh water pipe discharged through the fourth switching valve when the slurry is filled in the supply pipe. In a horizontal hydrohoist in which a plurality of fresh water injection pipes each having an operation valve are connected immediately before the third switching valve,
When the switching valve is closed, the corresponding fourth switching valve is closed first, and when the third switching valve is opened, an interlocking relationship is opened in which the corresponding fourth switching valve is opened earlier than the corresponding fourth switching valve. A horizontal hydrohoist characterized in that a control device having a time schedule for opening the operation valve at the closing timing and injecting fresh water into the third switching valve is provided, and is controlled by the control device.