JPS5823509B2 - 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, the present invention relates to a pump for pumping muddy materials such as concrete. This invention relates to a sludge pressure pump that allows the valve surface to return to normal without replacing parts.

Sludge like concrete has poor fluidity.

Since foreign matter such as aggregate is mixed into the pump, ordinary pumps cannot be used, and plunger pumps are mainly used because they require high pressure.

Plunger pumps are also simple in structure.

However, since the suction and discharge operations are performed intermittently, the flow path of the slurry must be switched between suction and discharge.

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, the valve plate of the rotary valve portion is in sliding contact, but since the material to be pumped is muddy material such as concrete, the sliding contact surface of the valve plate is seriously damaged.

Therefore, the replacement period for the valve plate is much shorter than for this type of valve that allows other fluids to flow, so in conventional equipment, if the pumped material leaks from the sliding contact part of the valve plate, the valve plate must be replaced by other fluids. The pump was replaced with a new one to maintain pump performance.

In this case, there is a problem that new parts must always be prepared, which increases costs, and if new parts cannot be procured, the pump cannot be used.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sludge pressure pump that can maintain pump performance without replacing the valve plate even if the sliding surface of the valve plate is damaged to the extent that it cannot be used.

To achieve this object, the present invention includes a fixed valve plate attached to a non-rotating main body, and a movable valve plate attached to a rotating drum, and the fixed valve plate and the movable valve plate are brought into opposing sliding contact, In the sludge pressure pump, the suction and discharge valves of the plunger pump provided on the rotary drum are switched by rotating the rotary drum by sealing these opposing surfaces with a sealing mechanism. The slurry pump is characterized in that the back side of the facing surface of the movable valve plate is formed into a shape to which the seal mechanism can be attached.

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, and the main body 2 also has two elongated holes 4 penetrating from one side to the other side, similar to the elongated 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.
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 thus formed.

This fixing plate 8G has elongated holes 9 and 10 that match the elongated holes 4 and 5 of the main body 2.

A position facing the fixed plate 8 (this is where the movable plate 11 is arranged so that its side surface contacts the fixed plate 8, and this movable plate 114 is located in the same position as the elongated hole 9° 10 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 from the center of the pitch circle of the elongated holes 4 and 5 of the main body 2 to the axial hole.

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.

Concrete cylinders 18 are fitted into these holes 16 and 17i, and these concrete cylinders 18 are fixed with stud bolts (not shown) that fix the axial positions of the rotating drum 13 and the driven drum 15. be done.

A piston 20 is fitted in the concrete cylinder 18 fixed in this manner so as to be freely stationary, 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. Since it is rotated by a hydraulic motor 24 or the like, it rotates together with the rotary drum 13, concrete cylinder 18, etc.

Therefore, the cylinder device 21. The plunger pump 25 is composed of a concrete cylinder 18, a piston 20, a 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 fixed by a pin 26b at a fixed position.

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 fixing plate 8 are arranged so that the main body 2 is in pressure contact with the hopper 26. Thus, the rotating drum 13 and the movable plate 11 are 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, the mixed concrete is scraped 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 are not attached to the inner wall 31. do not.

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.

This sealing mechanism will be explained with reference to FIGS. 4, 5, and 6. On the surface of the movable plate 11 on the fixed plate 8 side, the outer periphery is surrounded by 01J 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 around the entire circumference of the fixing plate 8 facing between each O-ring, that is, between 0-rings 32 and 33 and between 01-J rings 34 and 35.
are located respectively, and in these grooves 36 and 37,
Grease is constantly supplied via the conduit 38.

This grease is used when the moisture content of the concrete slurry discharged from the circular hole 12 is about to exceed 01J.
The purpose is to seal this, but it also serves to lubricate the contact surface between the fixed plate 8 and the movable plate 11.

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 and the QIJ songs 2, 33 and 01J songs 34 of the movable plate 11,
The six grooves 35 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 used upside down.

By rubbing in this manner, the fixed plate 8 and the movable plate 11 can be used for a long period of time.

Furthermore, as shown in FIGS. 4 and 6, a fixed plate 8 is provided between the O-ring 33 and the O-ring 34 provided with the movable plate 11.
A plurality of sealing members 39 are arranged in a radial manner to block the elongated hole 9 for ejection and the elongated hole 10 for suction.

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 problem.

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, if the gaskets, for example, the fixed plate 8 and the movable plate 11 are worn out, and you want to use them upside down, use a hammer or the like to hit the clasp 14b and remove it from the cock hole 14a.

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

Then, remove the fixed plate 8 from the main body 2 and the movable plate 11 from the rotary drum 13 by loosening the bolts ga and 11a (Fig. 5), and turn them over. The fixed plate 8 is fixed to the rotating drum 13 and the main body 2, and then reassembled in the reverse order of the above steps.

As described above, according to the present invention, even if the sliding surface of the valve plate is damaged to the extent that it cannot be used, there is no need to replace the valve plate with a new one.

Therefore, there is no need to constantly prepare new parts, and even if the sliding surface of the valve plate is damaged at an unexpected time, it can be quickly repaired, thereby maintaining pump performance. The pump rest time can be significantly reduced.

[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, 43 ... Seal mechanism.

Claims (1)

[Claims] 1. A fixed valve plate is attached to a non-rotating main body. A movable valve plate is attached to the rotating drum, the fixed valve plate and the movable valve plate are brought into opposing sliding contact, and these opposing surfaces are sealed by a sealing mechanism to rotate the rotating drum. In the sludge pump which switches the suction and discharge valves of the plunger pump, the back sides of the opposing surfaces of the fixed valve plate and the movable valve plate are each formed into a shape to which the seal mechanism can be attached. Features: Sludge pump.