JPS5823508B2 - Sludge pump - Google Patents

Description

[Detailed description of the invention] The present invention pumps slurry such as concrete.

For more information on the sludge pressure pump used in
This invention relates to a sludge pump that is easy to disassemble and assemble.

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. No.

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.

This type of pump uses many packings in the rotary valve section, the piston section of the plunger pump, etc., but since the material being pumped is muddy material such as concrete, the packings are frequently damaged.

In extreme terms, the pump will not operate properly unless these gaskets are replaced every day.

Therefore, it is preferable for this type of pump to have a structure that allows easy replacement of the gaskets.

However, with conventional pumps of this type, in order to replace the gaskets or the valve plate of the rotary valve, it is necessary to remove the hopper from the main body and then disassemble almost the entire device. Ta.

Therefore, it is extremely difficult to replace the gaskets, which inevitably delays the time to replace the gaskets, resulting in a decrease in pump efficiency.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sludge pump that allows the device to be disassembled and reassembled extremely easily, thereby making it easy to replace gaskets, valve plates, etc., and to clean the inside. shall be.

In order to achieve this object, the present invention attaches a fixed valve plate to a non-rotating main body, and adds a movable valve plate to a rotating drum, so that the fixed valve plate and the movable valve plate are brought into sliding contact with each other in opposition to each other. In a sludge pressure pump configured to switch the suction and discharge valve of a plunger pump provided on the rotating drum by rotating the drum, the fixed valve plate of the main body is attached with a hopper on the opposite side. and the hopper,
The pump is characterized in that the main body and the rotary drum are tightly clamped in the axial direction by their support shafts in a detachable manner.

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.

This main body 2 is formed into a flat plate, and the main body 2
, there are two long holes 4 and 5 penetrating from one surface side to the other surface side, similar to the long holes 9 and 10 shown in FIG. 4 (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.
It 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 contacts the fixed plate 8, and the movable plate 11 has holes on the same pitch circle as the elongated holes 910 of the fixed plate 8. Four circular holes 12 are bored in the hole.

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;
On the surface of the rotary drum 13 facing the movable plate 11, holes 16, 17 are bored which correspond to the circular holes 12 in 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 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, which is composed of the cylinder device 21, the concrete cylinder 18, the piston 20, the movable plate 11 serving as a rotary valve, etc., has one main body 2.
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 screwdriver 14b is driven into the cock hole 14a, and between the screwdriver 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 tightly clamped so that they can be attached and detached while touching each other.

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 11 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 side of the fixed plate 8 is surrounded by a Q+J ring 32, 33 on the outer periphery, and the center of the movable plate 11 is O-rings 34 and 35 are also provided on the inner circumferential portions closer to each other.

As shown in detail in FIG.
Grooves 36 and 37 provided over the entire circumference are located in the fixed plate 8 facing between the 1J rings 32 and 33 and between the 01J rings 34 and 35, respectively. , grease is constantly supplied through the conduit 38.

This grease is used to seal the moisture of the concrete slurry discharged from the circular hole 12 when it tries to cross each O-ring, but it is applied to the contact surface between the fixed plate 8 and the movable plate 11. It also serves as a lubricant.

Therefore, water in the concrete mud 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 OIJ songs 2 and 33 of the movable plate 11, and the O-rings 34 and 35
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 wear 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.

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

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. is determined to form an angle θ such that 70% to 80% of the angle θ is located between the two seal members 39.

This means that the sealing member 39 is hardly needed when pumping concrete slurry, and is especially necessary when pumping cleaning water to clean the inside of the device at the end of the pumping operation of the slurry. According to the experimental results, the angle θ should be 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
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.

Now, the seals, for example, the O of the fixed plate 8 and the movable plate 11.
To replace the rings 32, 33, 34, and 35, the gasket 20a of the piston 20, etc., use a hammer or the like to remove the screws 14b.
to remove it from the cock hole 14a.

Next, by removing the pin 26b and moving the hopper 26 forward, the main body 2 and the fixed plate 8 can be easily removed from the movable plate 11.

Therefore, since the movable plate 11 and the inside of the concrete cylinder 18 are exposed to the outside, the O-rings 32, 33, 34 and 3
5 and the gasket 20a of the piston 20 can be easily replaced.

In addition, in order to reassemble after completing this replacement work, it is sufficient to carry out the reassembly in the reverse order of the disassembly process.

As described above, according to the present invention, the device can be easily disassembled and assembled, so that the gaskets, valve plates, etc. can be easily replaced, and the inside can be cleaned easily.

Therefore, pump efficiency can be maintained over a long period of time.

[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... River/fixed plate (fixed valve plate),
11...Movable plate (movable valve plate), 13...
・Rotating drum 14...Fixed shaft (support shaft), 14
a...Cock hole, 14b...Cock, 14c
・First stage part, 26... Song Boppa.

Claims (1)

[Scope of Claims] 1. The above-mentioned fixed valve, in which a fixed valve plate is attached to a non-rotating main body, and a movable valve plate is attached to a rotating drum. In the slurry pump, the suction and discharge valves of a plunger pump provided on the rotary drum are switched by rotating the rotary drum by bringing a plate and a movable valve plate into opposing sliding contact, and the main body is fixed. A hopper is disposed on the opposite side of the valve plate grinder, and the hopper, the main body, and the rotating drum are tightly sandwiched by their support shafts in a detachable manner in the axial direction. pump.