JPS594556B2 - Sludge pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump for pumping muddy materials such as concrete, and more specifically, it can be used not only for pumping high-viscosity materials such as muddy materials, but also for pumping muddy materials such as water. This invention relates to a sludge pump that can pump even low-viscosity fluids.

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 so-called rotary valve-type sludge pump in which the opening surface of the plunger pump moves and alternately passes through fixed positions of an inlet and a discharge port.

In this type of pump, after completing the work of pumping mud to a high location, it is necessary to clean the inside of the device, the pumping pipe, and the like.

However, since the material being normally pumped is concrete mud etc., scratches tend to form on the sliding surface of the valve plate of the rotary valve.
Even if an attempt is made to forcefully pump clean water or the like in this state, the required pump head cannot be obtained.

Because the aforementioned scratches tend to form in the direction of rotation of the valve plate, that is, in the circumferential direction, clean water leaking from the sliding surface of the valve plate is
Rather than leaking in the radial direction, it is more likely to leak in the circumferential direction from the high-pressure discharge side to the suction side.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sludge pressure pump that prevents leakage of the valve plate so as to obtain the necessary head even with low viscosity fluid.

In order to achieve this object, the present invention attaches a fixed valve plate with long holes for suction and discharge, respectively, to a non-rotating main body, while a rotary drum can accommodate the long holes for suction and discharge. By attaching a movable valve plate having a circular hole, and rotating the rotary drum by bringing the fixed valve plate and the movable valve plate into opposing sliding contact, the suction and discharge valves of the plunger pump installed on the rotary drum can be switched. In the sludge pump, a sealing member extending in the radial direction and slidingly contacting the movable valve is provided between the long holes for suction and discharge in the fixed valve plate, and the suction side and the discharge side are connected by the sealing member. This feature is characterized by the fact that it is cut off.

Next, the present invention will be explained in detail with reference to FIGS. 1 to 7.

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

The main body 2 is formed into a flat plate shape, and the main body 2 also has two long holes 4 penetrating from one side to the other side, similar to the long holes 9 and 10 shown in FIG. , 5 (FIGS. 1 and 5) are formed on the same pitch circle.

These long holes 4 and 5 are connected to a plunger pump 25 which will be described later.
serves as the discharge port and suction hole.

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

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 a long hole 9° 10 that is the same as that of the fixed plate 8. Four circular holes 12 are bored on the pitch 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.

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

A surface of the driven drum 15 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
are fixed by stud bolts (not shown) that fix the axial positions of the rotating 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 driven by a fixed hydraulic pressure or the like. It is done like this.

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 11, revolves in sliding contact with the surface of the fixed plate 8.

On the other hand, a hopper 26 is located at the front of the main body 2.

Wheels 26a are attached to this hopper 26,
It is configured to move in the front and back direction on a rail 1a fixed on the base 1, and is configured to be fixed at a fixed position with a pin 26b.

The front end of the fixed shaft 14 faces inside the hopper 26 when assembled with the main body 2, and a cock hole 14a is formed in this front end.

A cocking hole 14b is driven into the cock hole 14a, and between the cocking hole 14b and the stepped portion 14c of the fixed shaft 14, the hopper 26, the main body 2, and the rotating drum 13 are slid between the fixed plate 8 and the movable plate 11. They are closely clamped so that they can be attached and detached while in contact.

Therefore, during assembly, since the hopper 26 is fixed by the pin 26b, the fixed shaft 14 is fixed to the hopper 26 in a fixed position, and the main body 2 and the fixed plate 8 are It is fixed to the hopper 26, and only the rotating drum 13 and the movable plate 11 rotate around the fixed shaft 14.

In this way, since the rotating drum 13 is restricted from moving in the axial direction relative to the main body 2, there is no gap between the movable plate 1 and the fixed plate 8, and these movable plates
The fixed plate 8 can serve as a rotary valve.

Furthermore, since the movable plate 11 rotates while slidingly contacting the fixed plate 8, it is possible that these contact surfaces may wear out, but in this case, if you drive in the screwdriver 14b, the fixed plate 8 and the movable plate 11 due to wear will be removed. The gap between can be eliminated.

A stirring blade 28 is provided in the hopper 26,
As a result, muddy concrete is scraped up while being kneaded toward the center of the hopper 26 and guided into the concrete cylinder 18.

Further, as shown in FIG. 2, the main body 2 is connected to a discharge port 30 having a flow path 29 so that the mud flows in the direction of revolution of the plunger pump 25, that is, in the direction of arrow A.

By attaching the discharge port 30 having such a shape to the main body 2, the mud passes through the inner wall 31 which is inclined in the direction in which the mud travels, so that concrete particles 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 11 faces the non-perforated position of the fixed plate 8 on the contact surface between the fixed plate 8 and the movable plate 11, which serve as a rotary valve, the plunger pump 25 pumps concrete mud. Or, even if a squeezing action is performed to discharge water to clean the inside of the device at the end of the pumping operation, water in the mud or cleaning water should not leak from between the fixed plate 8 and the movable plate 11. A sealing mechanism is provided for this purpose.

To explain this sealing mechanism with reference to FIGS. 4, 5, and 6, the surface of the movable plate 11 on the fixed plate 8 side is surrounded by O-rings 32, 33, and the circular hole 12 is 01J rings 34 and 35 are also provided on the inner circumference near the center.

As shown in detail in FIG. 5, grooves 36 and 37 are provided along 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 these grooves 36, 37 are constantly supplied with grease via a conduit 38.

This grease is used to seal the moisture of the concrete slurry discharged from the circular holes 12 when it tries to exceed each O-ring. It also serves as a lubricant.

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

The grooves 36 and 37 of the fixed plate 8 formed in this way, the 01J ring 32.33 and the 0 ring 34.35 of the movable plate 11
The grooves are also formed on the back sides of the fixed plate 8 and the movable plate 11, so that when the sliding surfaces of the fixed plate 8 and the movable plate 11 become worn out, they can be turned over and used.

By doing so, the fixed plate 8 and the movable plate 11 can be used for a long period of time.

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 groove 40 provided in the main body 2 and fixed plate 8, and is configured to constantly press against the surface of the movable plate 11 by a spring 41.

Therefore, even if the fluid introduced into the concrete cylinder 18 from the hopper 26 through the long holes 5 and 10 by the suction operation of the rotating Francia pump 25 is a low-viscosity fluid such as cleaning water, It is possible that the circular hole in the movable plate 11 extends from the long hole 9 to the long hole 10, and leakage occurs during the process of discharging from the long hole 10. Furthermore, the leakage may occur once through the long hole 4 and the long hole 9 to the discharge port 30. When discharged, the discharged cleaning water, etc. moves stably to a high position, and leakage due to the water pressure does not occur.

Further, like the thermal theory, the circular hole of the movable plate 11 also exhibits a leakage prevention effect during the return process from the elongated hole 10 to the elongated hole 9.

Therefore, when cleaning the inside of the device and the inside of the pressure-feeding pipeline with washing water after the work of pumping mud, for example, the washing water is poured into the hopper 26 and stored, and the work of pumping the mud is completely removed. If the pump is driven in the same way, the inside of the device etc. will be cleaned during the process of pumping the cleaning water.

As the material of the sealing member 39, it is preferable to use a wear-resistant elastic material or a compound.

In this case, as shown in FIG. 4, the position of the sealing member 39 is preferably 60 to 90% of the area of the circular hole 12 when the circular hole 12 of the movable plate 11 reaches the non-perforated position of the fixed plate 8. , 70 to 80% of the angle θ is set between the two seal members 39.

This is because the seal member 39 is hardly needed when pumping concrete slurry, and when pumping cleaning water to clean the inside of the device at the end of the pumping operation of the slurry, the seal member 39 is used in the circumferential direction. It is especially necessary to seal the cleaning water that is about to leak into the pump, and it is sufficient that the seal can be sealed to the extent that it does not affect the pump head.According to the experimental results, the angle θ is within the above range.
It turns out that it is sufficient to define

Therefore, by determining the angle θ as described above,
The diameters of the main body 2, fixed plate 8, movable plate 11, and rotating drum 13, and the pitch diameter of the plunger pump 25 are determined by
The height from the upper surface of the concrete slurry in the hopper 26 to the suction port can be reduced within a range that does not cause any problems.

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.

As described above, according to the present invention, not only high viscosity mud but also low viscosity fluid can be pumped. can be pumped.

[Brief explanation of drawings]

FIG. 1 is a partially vertically sectional side view showing an embodiment of the present invention;
Figure 2 is a plan view with one part omitted, Figure 3 is a front view, and Figure 4 is a front view.
The figures are a cross-sectional view taken along the line IV--IV in FIG. 1, FIG. 5 is an enlarged cross-sectional view of a main part, and FIG. 6 is a cross-sectional view taken along the line ■--■ in FIG. 4. 2...Main body, 8...Fixed plate (fixed valve plate), 11...Movable plate (movable valve plate), 13...
... Rotating drum, 25 ... Plunger pump, 39 ... Seal member.

Claims (1)

[Claims] 1. A fixed valve plate with long holes for suction and discharge, respectively, is attached to the non-rotating main body, while a movable valve plate with a circular hole compatible with the long holes for suction and discharge is attached to the rotating drum. In the sludge pump, the suction and discharge valves of the plunger pump provided on the rotary drum are switched by rotating the rotary drum with a fixed valve plate and a movable valve plate in opposing sliding contact. A sealing member extending in the radial direction and slidingly contacting the movable valve plate is provided between the long holes for suction and discharge in the valve plate, and the suction side and the discharge side are isolated by the sealing member. Sludge pump.