JPS5820393B2 - Sludge pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slurry pump used for pumping slurry such as concrete, and more specifically, the present invention relates to a slurry pump used for pumping slurry such as concrete. This invention relates to a pump for pumping sludge that has been improved to prevent the occurrence of sludge.

Mud like concrete has poor fluidity and contains foreign substances such as aggregate, so ordinary pumps cannot be used, and since it requires high pressure, plungers are mainly used. pump is used.

Plunger pumps have the advantage of having a simple structure and being able to obtain high pressure, but because they perform suction and discharge operations intermittently, the flow path of the mud must be switched between suction and discharge. It won't happen.

In order to efficiently perform this switching, the sludge pressure pump uses multiple plunger pumps that revolve while performing suction and discharge operations, and when one plunger pump performs suction operation, the other plunger pump performs discharge operation. There is a rotary type sludge pump in which the opening surface of the plunger pump moves and alternately passes through fixed positions of the suction port and the discharge port.

However, in this type of pump, when transitioning from suction operation to discharge operation, the opening surface of the plunger pump is located between the suction port and the discharge port, that is, where the opening surface is closed. High pressure is applied to the mud sucked into the cylinder, and only the moisture leaks from the seal portion of the opening surface, resulting in a phenomenon in which the amount of water contained in the mud becomes extremely small.

Therefore, when the open surface of the plunger pump reaches the discharge port and the sludge containing less water is discharged from the discharge port, it becomes difficult to discharge from the discharge port because of poor fluidity.

During this discharge, as shown in FIG. When the discharge is performed, the arrow A of the discharge port 30b
Dehydrated concrete grains adhere to the inner wall 31b on the direction side, forming a layer on which concrete can easily settle.

Even if this layer is formed, if the sludge is still discharged, the layer will grow in a state similar to crystal growth,
A concrete mass 43 as shown in FIG. 8 is formed in about 10 minutes.

As a result, the opening area of the discharge port 30b is gradually narrowed due to the concrete mass 43, and the flow of the mud becomes poor, which promotes the growth of the concrete mass 43.
This causes a phenomenon in which pump efficiency becomes extremely poor.

Since the concrete mass 43 thus formed is solidified, it cannot be crushed, and in order to improve pump efficiency, it was necessary to replace one discharge port 30b.

Therefore, the present inventors repeatedly conducted various experiments, and found that regardless of whether the inner wall 31b of the discharge port 30b is first concave or straight, the position where concrete particles first adhere is the discharge port. It has been found that 30b is attached at a position several tens of millimeters from the end, and it has also been found that a concrete mass 43 is formed by growing from concrete grains formed at this position.

Therefore, it is only necessary to first improve the inner wall of the discharge pipe to which concrete particles adhere so that concrete particles do not adhere thereto.

By improving the discharge pipe, the present invention prevents the formation of concrete lumps in the discharge pipe, even if water is removed from the mud due to the aforementioned squeezing action of the plunger pump and the mud becomes difficult to flow. The purpose of the present invention is to provide a sludge pressure pump that can maintain the original pump efficiency over a period of time.

To achieve this objective, the present invention aims to prevent concrete particles from adhering to the inner wall of the discharge pipe by improving the discharge pipe so that the flow direction of the mud flowing inside the discharge pipe is oriented in the direction of revolution of the plunger pump. It is characterized by the following points.

Next, the present invention will be explained in detail with reference to FIGS.

1 to 3, a substantially circular main body 2 is fixed on a base 1. As shown in FIGS.

As can be seen in FIG. 1, a recess 3 having a U-shaped cross section is formed in one surface of the main body 2.

Further, as can be seen in FIG. 4, two elongated holes 4 and 5 penetrating from one surface to the other surface of the main body 2 are formed on the same pitch circle.

From the edges of these elongated holes 4, 5, 7 flanges 6.7 extend outward, with the upper flange 6 serving as a discharge port connection flange and the lower 7 flange 7 serving as an inlet port. Used for connecting 7 lunges.

A fixed plate 8, which functions as a rotary valve together with a movable plate 11 to be described later, is fixed to the recess 3 of the main body 2 formed in this way.

This fixing plate 8 is formed with elongated holes 9 and 10 that match the elongated holes 4 and 5 of the main body 2.

A movable plate 11 is disposed at a position facing the fixed plate 8 so that its side surface is in contact with the fixed plate 8, and the movable plate 11 has elongated holes 9.degree. Four square holes 12 are bored on a circle.

This movable plate 11 is fixed to one surface of a rotating drum 13 and rotates together with this rotating drum 13.

The rotating drum 13 is rotatably supported on a fixed shaft 14 extending in the axial direction from the center of the pitch circle of the elongated holes 4 and 5 of the main body 2.

Note that since the rotating drum 13 is narrowed between the fixed shaft 14 and the fixed plate 8 via the movable plate 11 and its axial movement is restricted, there is no space between the movable plate 11 and the fixed plate 80. There is no gap, and the movable plate 11 and fixed plate 8 can function as a rotary valve.

On the other hand, on the fixed shaft 14 at the rear of the rotating drum 13,
A driven drum 15 is rotatably supported.

This driven drum 150 has a surface facing the rotating drum 13;
Holes 16 and 17 are formed in the surface of the rotary drum 13 facing the movable plate 11, respectively, to match the circular holes 12 of the movable plate.

In these holes 16,17 there are concrete cylinders 18
These concrete cylinders 18
As shown in FIG. 2, the rotary drum 13 and the driven drum 15 are fixed by stud bolts 19 that fix the axial positions of the drum 13 and the driven drum 15.

A piston 20 is slidably fitted into the concrete cylinder 18 fixed in this manner, and the piston 20 is reciprocated by a cylinder device 21 fixed to the driven drum 15 and driven by hydraulic pressure or the like. has been made.

Further, the driven drum 15 is configured to support its weight by a roller 22 located on the base 1, and this driven drum 15 has a sprocket 23 fixed to the rotating drum 13 and is driven by a driving source, e.g. By rotating it with a hydraulic motor 24 or the like, it rotates together with the rotary drum 13, concrete cylinder 18, etc.

Therefore, the plunger pump 25 is composed of the cylinder device 21, the concrete cylinder 18, the piston 20, the movable plate 11 serving as a rotary valve, etc.
The opening surface, ie, the surface of the movable plate 110, revolves in sliding contact with the surface of the fixed plate 8.

On the other hand, the suction port connecting flange I is connected to the hopper 26')
It is connected to a connecting pipe 27 and serves to guide muddy concrete, which is mixed and scraped toward the center of the hopper 26 by stirring blades 28 provided inside the hopper 26, into the concrete cylinder 18.

Further, in the discharge port connection 7 flange 6, as shown in cross section in FIG. 30 are connected.

By attaching the discharge port 30 having such a shape to the discharge port connection flange 6, the plunger pump 25 can be
While moving in the direction of arrow A in the figure, the movable plate 110 circular hole 12
When concrete mud is discharged from the fixing plate 8 and the elongated holes 9, 4 of the main body 2 into the flow path 29 of the discharge pipe 30, the discharged mud does not move in the direction of arrow A and then flows out. Road 29
Since it moves forward in the interior, the position of the inner wall 31 on the arrow A direction side of the flow path 29 where many muddy substances come into contact becomes the inclined part of the inner wall 31.

Therefore, since the muddy material slips through the inner wall 31 which is inclined in the direction in which the muddy material travels, concrete grains do not adhere to the inner wall 31.

This has also been proven experimentally. On the other hand, when the circular hole 12 of the movable plate 110 faces the non-perforated position of the fixed plate 8, the plunger pump 25 removes concrete mud from the contact surface between the fixed plate 8 and the movable plate 11, which serve as rotary valves. Even with the squeezing action for discharge, the water content of the slurry remains fixed.

A sealing mechanism is provided to prevent leakage from between the plate 8 and the movable plate 11.

This sealing mechanism will be explained with reference to FIGS. 4, 5, and 6. On the surface of the movable plate 11 on the side of the fixed plate 8, the outer periphery is surrounded by O-rings 32, 33, and there is also a circular hole.

An O-ring 34°35 is also provided on the inner circumference closer to the center than 12.

As shown in detail in FIG. 5, grooves 36 and 37 are provided around the entire circumference of the fixing plate 8 between each O-ring, that is, between O-rings 32 and 33 and between O-rings 34 and 35. are located respectively, and pressure water is constantly supplied to these grooves 36 and 37 via a pipe line 38.

This pressurized water is used to return water from the concrete slurry discharged from the circular holes 12 to the circular holes 12 side when it tries to exceed each O ring, but it is used to return the water to the circular holes 12 side. It also serves to lubricate the contact surface with the movable plate 11.

Therefore, the moisture in the concrete slurry discharged from the circular holes 12 cannot escape in the radial direction of the contact surface between the fixed plate 8 and the movable plate 11.

Further, as shown in FIGS. 4 and 6, between the O-ring 33 and the O-ring 34 provided on the movable plate 11, there is a gap between the discharge elongated hole 9 and the suction elongated hole 10 of the fixed plate 8. A plurality of seal members 39 are arranged radially to block the gap.

As can be seen from FIG. 6, this sealing member 39 is inserted into a radial back 40 provided on the main body 2 and fixed plate 8, and is configured to constantly press against the surface of the movable plate 110 by a spring 41.

As the material of the seal member 39, it is preferable to use a wear-resistant elastic body, gun metal, or the like.

In this way, by sealing the contact surface between the fixed plate 8 and the movable plate 11, it is possible to prevent leakage from the discharge port side to the suction port side, and also to prevent the movable plate 1 from being in a hole-free position of the fixed plate 8.
10 When the circular holes 12 face each other, the plunger pump 25
Since the mud does not leak even when the concrete cylinder 18 performs a squeezing action to discharge concrete mud, water does not escape from the mud in the concrete cylinder 18 and fluidity does not deteriorate.

Therefore, when this muddy material passes through the flow path 29 of the discharge port 30, the flow path 29 is formed so that the muddy material can easily flow and has good fluidity, so that under favorable conditions. Sludge can be discharged with

As can be seen from FIG. 1, there is a space inside the driven drum 15 and behind the piston 20 inside the concrete cylinder 18.
Since it is filled with water 42, the water 42 also moves in and out of each concrete cylinder 18 as the piston 20 reciprocates.

Therefore, even if concrete mud inside the concrete cylinder 18 exceeds the seal of the piston 20 and adheres to the cylinder wall, it can be cleaned with the water 42, and this water 42 also serves as a lubricant for the piston. The durability of the plunger pump 25 can be improved.

Now, by driving the hydraulic motor 24 to rotate the rotary drum 13, each plunger pump 25 is caused to revolve in the direction of arrow A in FIG.

Next, by operating the cylinder device 21 that drives the concrete slurry mixed in the hopper 26 and scraped toward the center of the hopper 26 by hydraulic pressure or the like, the arrow A
suction into the concrete cylinder 18 that revolves in the direction.

As can be seen in FIG. 4, the opening surface of the plunger pump 25 that sucked the concrete mud, that is, the circular hole 12 of the movable plate 110, gradually moves to the non-porous part of the fixed plate 8, and then
Moving to the discharge process (when the cylinder device 21 operates and the piston 20 moves forward, the concrete slurry filled in the concrete cylinder 18 is compressed, but as described above, the fixed plate 8 and the movable plate 11 Since the water contained in the concrete mud does not leak from the contact surface of the concrete mud, the mud reaches the elongated discharge hole 9 of the fixed plate 8 while maintaining its fluidity, and the mud is discharged as described above. It passes through the inner wall 31 of the outlet 30 in the direction of arrow A in FIG. 2 and is discharged.

Therefore, concrete particles do not adhere to the inner wall 31 of the discharge port 30.

Each plunger pump 25 discharges concrete slurry while repeating the above-described action.

Note that, as shown in FIG. 1, the inner wall 31a is connected to the long hole 9 of the fixing plate 8 in the direction of the arrow A without forming almost any straight line on the inner wall 31a of the discharge port 30a on the arrow A direction side. If it is formed so as to face to the side, even more favorable conditions can be achieved.

As described above, according to the present invention, mud can be discharged without concrete grains etc. adhering to the discharge pipe and forming a layer where concrete etc. tend to settle, so that no concrete lumps are formed in the discharge pipe.

Therefore, it has the advantage that the initial pump efficiency can be maintained over a long period of time, and there is no need to replace the discharge pipe unlike conventional devices, and its effects are significant.

[Brief explanation of the drawing]

Fig. 1 is an overall vertical sectional view showing an embodiment of the present invention, Fig. 2 is a partial plan view, Fig. 3 is a front view, and Fig. 4 is a
FIG. 1 is a cross-sectional view taken along line IV--IV, FIG. 5 is an enlarged cross-sectional view of section a in FIG. 1, FIG. 6 is a cross-sectional view taken along line Vl-■ in FIG.
FIG. 1 is a sectional view of a discharge port showing another embodiment, and FIG. 8 is a sectional view of a discharge port of a conventional device. 2...Main body, 11.--Movable plate, 12.
...Round hole, 25...Plunger pump, 30,30a--Discharge port, 31.31a...
···inner wall.

Claims (1)

[Claims] 1 In a mud pump that suctions and discharges mud while rotating a plunger pump whose opening surface is in sliding contact with a fixed body in a direction transverse to its stroke direction, a discharge port provided in the body A sludge pressure pump characterized in that the flow direction of the sludge is oriented in the direction of revolution of the plunger pump.