JP3524732B2 - Fluid pumping equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pumping apparatus for pumping fluid, and is particularly effective when applied to a concrete pump for transporting fresh concrete or the like.

[0002]

2. Description of the Related Art A schematic structure of a conventional concrete pump for conveying fresh concrete (hereinafter referred to as "green concrete") is shown in FIGS. As shown in FIG. 5, the upper part of the gate housing 2 is connected to the lower part of the hopper 1 into which the ready-mixed concrete is put. As shown in FIGS.
A sliding plate 3 having a pair of communication holes 3a and 3b is fitted on one side surface (one end) of the gate housing 2. One ends of the cylinders 4a and 4b are connected to the outer portions of the communication holes 3a and 3b of the sliding plate 3, respectively. Inside the cylinders 4a and 4b, pistons 5a and 5b are provided.
Is provided.

As shown in FIG. 6, one end surface side of a support block 6 is connected to the other ends of the cylinders 4a and 4b, and the cylinders 4a and 4b are connected to the support block 6.
Sliding holes 6a and 6b are formed so as to communicate with each other coaxially. On the other end surface side of the support block 6, the sliding hole 6 is formed.
One ends of the cylinders 7a and 7b are respectively connected so as to be coaxial with the cylinders 7a and 7b.
One end of b is connected by a connecting pipe 10.
Inside these cylinders 7a, 7b, pistons 8a,
8b are provided respectively.

As shown in FIG. 6, the piston 5a and the piston 8a are connected to a slide hole 6a of a support block 6 by a rod 9a slidably supported. Further, the piston 5b and the piston 8b are
It is connected to the slide hole 6b of the support block 6 by a rod 9b slidably supported.

That is, when pressure is applied from the other end of the cylinder 7a to the inside of the cylinder 7a and at the same time the pressure in the cylinder 7b is reduced from the other end of the cylinder 7b, the piston 8a is moved from the other end of the cylinder 7a to one end. And the piston 5a moves from the other end side of the cylinder 4a to one end side via the rod 9a, and the piston 8b moves from one end side to the other end side of the cylinder 7b to move the rod 9b.
While the piston 5b moves from one end side to the other end side of the cylinder 4b via the, the pressure is applied to the inside of the cylinder 7b from the other end of the cylinder 7b, and at the same time, the pressure in the cylinder 7a is applied from the other end of the cylinder 7a. When it is decreased, the piston 8b moves from the other end side of the cylinder 7b to one end side, the piston 5b moves from the other end side of the cylinder 4b to one end side via the rod 9b, and the piston 8a moves to one end side of the cylinder 7a. Side to the other end side, the rod 9a
The piston 5a is adapted to move from one end side to the other end side of the cylinder 4a via. The cylinders 4a, 4b, 7a, 7b, the pistons 5a, 5b, 8
In this example, the fluid delivery means is constituted by a, 8b, the support block 6, the rods 9a, 9b, the connecting pipe 10, and the like.

On the other hand, as shown in FIGS. 5 and 6, in the gate housing 2, one end of the swing pipe 11 is brought into contact with the sliding plate 3 and the other end is the other side surface of the gate housing 2. The rocking pipe 11 penetrates the other side surface of the gate housing 2 so as to be positioned outside and the one end side of the rocking pipe 11 has a substantially S shape (generally a crank shape) and the other end side has an axial center. By rotating in the circumferential direction around the center, one end side of the sliding plate 3 has the communication hole 3a or the communication hole 3
It can be switched so as to be connected to b.

As shown in FIG. 5, the other end of the oscillating pipe 11 is rotatably supported in the circumferential direction, and is rotatable in the circumferential direction by a drive device 12 which is a switching means, that is, a sliding member. The connection with the communication hole 3a or the communication line 3b of the moving plate 3 can be switched. The other end of the swing pipe 11 is connected to one end of the discharge pipe 13 so as to be rotatable in the circumferential direction.

The operation of such a concrete pump will be described below. The drive device 12 is operated to rotate the rocking pipe 11 so that one end of the rocking pipe 11 is connected to the communication hole 3a of the sliding plate 3, and the piston 5b is moved to the other end side of the cylinder 4b. When the pressure on the other end side of the cylinder 7b is adjusted to move and the pressure on the other end side of the cylinder 7a is adjusted to move the piston 5a to the one end side of the cylinder 4a, the inside of the gate housing 2 is passed through the hopper 1. The fresh mixed concrete that has entered is sucked into the cylinder 4b as the piston 5b moves.

Next, the rocking pipe 11 is rotated so that one end of the rocking pipe 11 is connected to the communication hole 3b of the sliding plate 3, and the piston 5a is moved to the one end side of the cylinder 4a. If the pressure on the other end side of the cylinder 7b is adjusted so as to move the piston 5b to the other end side of the cylinder 4b while adjusting the pressure on the other end side of 7a, the ready-mixed concrete in the cylinder 4b moves with the movement of the piston 5b. The raw concrete in the gate housing 2 is sucked into the cylinder 4a as the piston 5a moves while being discharged into the swing pipe 11 and conveyed through the discharge pipe 13.

By repeating the above steps, the ready-mixed concrete can be conveyed one after another.

[0011]

In the conventional concrete pump described above, a slight gap is provided between one end of the rocking pipe 11 and the sliding plate 3. This gap is kept at the minimum necessary size by mechanical adjustment of screws or the like in order to maintain the pressure-feeding ability of the ready-mixed concrete, but the above-described switching rotation of the swing pipe 11 causes the sliding plate 3 to move. The sliding surface wears and gradually becomes larger. If the gap becomes large in this way, not only will the fresh mix leak from the gap, the pumping amount of the fresh mix will be reduced, but also the peripheral edge of the rocking pipe 11 on one end side will be worn. Will be promoted. Therefore, it is necessary to constantly check the condition of the sliding surface of the sliding plate 3 and adjust the size of the gap, but as described above, the size of the gap should be set by mechanical adjustment. Therefore, the gap cannot be adjusted during the transportation of the ready-mixed concrete, and the transportation work must be temporarily interrupted to perform the gap adjustment, resulting in a reduction in the efficiency of the transportation work.

Therefore, one end of the swing pipe 11 is connected to the sliding plate 3
There is proposed a type in which the size of the gap is always kept constant by automatically pressing it with a hydraulic cylinder or the like. However, in such a type, the swing pipe 11 is resisted against the discharge force of the ready-mixed concrete. Since one end of the above must always be pressed against the sliding plate 3, there is a problem that the pressing mechanism such as a hydraulic cylinder becomes large.

Such a problem is not limited to a concrete pump for transporting ready-mixed concrete, but a fluid pumping device for pumping a fluid such as a slurry fluid such as earth and sand or soft soil by the piston type as described above, This can happen in the same manner as described above.

In view of the above, an object of the present invention is to provide a fluid pumping device which can keep the gap between the oscillating pipe and the sliding plate always constant, even if it is small and simple. did.

[0015]

In order to solve the above-mentioned problems, the fluid pumping device according to the first aspect of the present invention is provided with a fluid plate inside and a sliding plate having a pair of communication holes. And a gate housing provided in the gate housing, and a fluid delivery device that is respectively coupled to the outside portion of the communication hole of the sliding plate of the gate housing to alternately suck and discharge the fluid in the gate housing. And a means having a substantially S-shape on one end side, positioned inside the gate housing so as to be able to abut the sliding plate of the gate housing, and supported so as to be rotatable around the axis on the other end side. A swinging pipe and a switching means for rotating the swinging pipe around the axis on the other end side so that one end of the swinging pipe is connected to one of the communication holes of the sliding plate of the gate housing. When The rocking pipe is provided with a facing member that faces the peripheral edge of the other end of the rocking pipe with a gap of a predetermined size, the one end and the other end of the rocking pipe have the same inner diameter, and the rocking is performed. One end and the other end of the pipe are the following formula (1)
It is characterized by having the relationship (simple solution).

[Equation 3] However, D ₁ is the outer diameter of one end of the rocking pipe, D ₂ is the inner diameter of the rocking pipe, and D ₃ is the outer diameter of the other end of the rocking pipe.

The fluid pumping device according to the second invention is
A fluid is supplied to the inside, and a gate housing having a sliding plate having a pair of communication holes at one end is connected to a gate housing, and a pair of the sliding plates of the gate housing is connected to an outer portion of the communication hole. A fluid delivery means for alternately sucking and ejecting the fluid in the gate housing, and one end side of the gate housing having a substantially S-shape and capable of contacting the sliding plate of the gate housing. An oscillating pipe located inside and supported so as to be rotatable around the axis on the other end side, and one end of the oscillating pipe communicates with one of the communication holes of the sliding plate of the gate housing. So as to rotate the swing pipe around the axis on the other end side, and a facing member that faces the peripheral edge of the other end of the swing pipe with a gap of a predetermined size. Tena, the shaking One end and the inner diameter of the other end of the pipe is equal, the one end and the other end of the swing pipe and having a relationship of Equation (2) below (exact solution).

[Equation 4] However, D ₁ is the outer diameter of one end of the rocking pipe, D ₂ is the inner diameter of the rocking pipe, and D ₃ is the outer diameter of the other end of the rocking pipe.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment in which a fluid pumping device according to the present invention is applied to a concrete pump.
2 is used for the explanation. Note that FIG. 1 is a cross-sectional view showing the structure of the main part, and FIG. 2 is an operation explanatory view. However,
The same parts as those of the conventional concrete pump described above are denoted by the same reference numerals as used in the description of the conventional concrete pump, and the description thereof will be omitted.

As shown in FIGS. 1 and 2, the swing pipe 21
Has an inner diameter D _{2 of the} same size between the end side (one end side) facing the sliding plate 3 and the other end side, and the outer diameter of the end side (one end side) facing the sliding plate 3 Is D ₁ and the outer diameter of the other end is D
If these are set to ₃ , these D ₁ , D ₂ , and D ₃ satisfy the relationship (simple solution) of the following expression (1) or the relationship (exact solution) of the expression (2).

[0019]

[Equation 5]

On the other hand, as shown in FIG. 1, on the outside of the other side surface of the gate housing 2, there is provided a cylindrical casing 14 which supports the rocking pipe 21 coaxially with the other end of the rocking pipe 21. Is attached to one end of the oscillating pipe 2 while the casing 14 rotatably supports the oscillating pipe 21 via a bearing 15.
It is a facing member that faces the other end of 1 with a gap of a predetermined size. On the other end side of the outer peripheral surface of the rocking pipe 21, a packing 16 for sealing the outer peripheral surface of the pipe 21 is provided.
Are fitted.

As shown in FIG. 1, between the rocking pipe 21 and the casing 14, an auxiliary cylinder 17 for urging the rocking pipe 21 toward one end along the direction of the rotation axis is arranged. There is. The other end of the casing 14 is connected to one end of the discharge pipe 13 (not shown in FIG. 1).

In such a concrete pump, the rocking pipe 21 is rotated so that one end of the rocking pipe 21 is connected to the communication hole 3b of the sliding plate 3 and then the flow previously sucked into the cylinder 4b. When the raw concrete which is a body is discharged by the piston 5b, the raw concrete is fed into the discharge pipe 13 through the swing pipe 21.

At this time, as shown in FIG. 2, the feed pressure P of the ready-mixed concrete acts on both ends of the oscillating pipe 21, so that one end of the oscillating pipe 21 has the following formula (3). )
The force F ₁ toward the other end side as shown in FIG. 2 acts, and the other end side of the rocking pipe 21 has one end side as shown in the following formula (4) by the other end side (facing member) of the casing 14. A force F ₂ toward the head works.

[0024]

[Equation 6]

The above-mentioned F ₁ is expressed as the following equation (3a) as an exact solution.

[0026]

[Equation 7]

Here, since the area of the other end of the oscillating pipe 21 is larger than the area of the one end, the oscillating pipe 21 has a force F substantially directed from the other end side to the one end side. Only (= F ₂ −F ₁ > 0) appears, and the oscillating pipe 21 is pressed so that its one end is in complete contact with the sliding plate 3.

When not in operation, that is, the swing pipe 2
When there is no load at which the feed pressure P does not act on 1, the auxiliary cylinder 17 lightly presses one end side of the swing pipe 21 against the sliding plate 3.

That is, the inner and outer diameters of both ends of the swing pipe 21
By setting the size according to the above equation (1),
Balance the force applied to the oscillating pipe 21 during the discharge of₂
> F ₁With the discharge, one end of the oscillating pipe 21
Can be automatically pressed against the sliding plate 3 to develop sealing performance.
I did so.

For this reason, the rocking pipe 2 can be used even during transportation of ready-mixed concrete.
Since the gap between 1 and the sliding plate 3 is automatically adjusted, it is possible to eliminate the need to temporarily interrupt the ready-mixed concrete transport operation to adjust the gap.

Therefore, even with a small and simple structure, the gap between the rocking pipe 21 and the sliding plate 3 can be kept constant at all times, so that the improvement of the work efficiency of the ready-mixed concrete can be easily realized at a low cost. be able to.

Further, since the inner and outer diameters of both ends of the rocking pipe 21 have the relationship of the above-mentioned formulas (1) and (2), one end of the rocking pipe 21 (the intake port of the ready-mixed concrete) is made as thick as possible. Therefore, it is possible to suppress wear and damage of the end of the rocking pipe 21 when cutting the aggregate or gravel in the ready-mixed concrete as much as possible.

Further, as shown in FIGS. 3 and 4, by fitting the ring 18 to the other end of the outer peripheral surface of the rocking pipe 11, the relations of the above equations (1) and (2) are satisfied. It is also possible to do so.

Further, in the present embodiment, the auxiliary cylinder 1
7 is arranged inside the casing 14, but instead of this, for example, as shown in FIG. 3, a bracket 11a integral with the sliding pipe 11 is projected from the casing 14 and provided outside the casing 14. The rod 19a of the auxiliary cylinder 19 may be connected to the bracket 11a.

Further, in the present embodiment, the case where the present invention is applied to the concrete pump has been described, but the present invention is not limited to this, as long as it is a fluid pumping device for pumping fluid such as slurry fluid such as earth and sand or soft soil. It can be applied in the same manner as the above case.

[0036]

In the fluid pumping device according to the present invention, the fluid is supplied to the inside thereof, and the gate housing is provided at one end thereof with the sliding plate having the pair of communication holes, and the sliding plate of the gate housing. A fluid delivery means that is respectively coupled to the outside portion of the communication hole to form a pair and alternately sucks and discharges the fluid in the gate housing, and one end side is substantially S-shaped and the gate housing An oscillating pipe, which is located inside the gate housing so as to be able to contact the sliding plate and is supported so as to be rotatable around the axis on the other end side, and one end of the oscillating pipe is attached to the gate housing. A switching unit that rotates the swing pipe around the axis on the other end side so as to communicate with any one of the communication holes of the sliding plate, and a peripheral edge of the other end of the swing pipe of a predetermined size. Gap And a facing member facing each other. Since the area of the other end of the rocking pipe is larger than the area of the one end, when the fluid is fed into the rocking pipe by the fluid feeding means, the fluid flows. Since the reaction force of the feeding pressure causes the force acting from the other end side of the rocking pipe to the one end side to be greater than the force acting from the one end side of the rocking pipe to the other side by the body feeding pressure, In the moving pipe, only the force from the other end to the one end appears, and the one end of the swing pipe is pressed so as to be brought into close contact with the sliding plate. Since the gap between the pipe and the sliding plate is automatically adjusted, it is possible to eliminate the need to temporarily interrupt the fluid conveyance work to adjust the gap. As a result, the gap between the oscillating pipe and the sliding plate can always be kept constant even with a small and simple structure, and the work efficiency for transporting the fluid can be easily improved at low cost.

Further, the inside diameter of the oscillating pipe, the outside diameter at one end, and the outside diameter at the other end are the above-mentioned relationship of (D ₁ + D ₂ ) / 2 ≦ D ₃ (simple solution) or 3D ₃ ^2- (D ₁ ² + D ₁ D ₂ +
If a D ₂ ²⁾ ≧ 0 relations (exact solution), it is possible to obtain the effect described above, it is as much as possible thick wall thickness of one end of the swing pipe against the other end Therefore, it is possible to suppress wear and damage at one end of the swing pipe as much as possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a main part of an embodiment when a fluid pumping device according to the present invention is applied to a concrete pump.

FIG. 2 is a diagram for explaining the operation of FIG.

FIG. 3 is a sectional view showing a structure of a main part of another embodiment in which the fluid pumping device according to the present invention is applied to a concrete pump.

FIG. 4 is an explanatory view of the operation of FIG.

FIG. 5 is a partially cutaway perspective view showing an overall schematic structure of a conventional concrete pump.

6 is a cross-sectional view of the main part of FIG.

[Explanation of symbols]

1 hopper 2 gate housing 3 Sliding plate 3a, 3b communication hole 4a, 4b cylinder 5a, 5b piston 6 support blocks 6a, 6b Sliding hole 7a, 7b cylinder 8a, 8b piston 9a, 9b rod 10 connecting pipe 11 rocking pipe 11a bracket 12 Drive 13 Discharge pipe 14 casing 15 bearings 16 packing 17 Auxiliary cylinder 18 rings 19 Auxiliary cylinder 21 rocking pipe

Claims (2)

(57) [Claims] 1. A gate housing having a sliding plate having a communicating hole paired therein and having a fluid supplied therein, and a pair on the outer side of the communicating hole of the sliding plate of the gate housing. And a fluid delivery means which is connected to each other and alternately sucks and discharges the fluid in the gate housing, and one end side of which is substantially S-shaped so that it can contact the sliding plate of the gate housing. An oscillating pipe that is located inside the gate housing and is supported so as to be rotatable around the axis on the other end side; and one end of the oscillating pipe of the oscillating pipe of the sliding plate of the gate housing. Switching means for rotating the rocking pipe around the axis on the other end side so as to communicate with either one, and face the peripheral edge of the other end of the rocking pipe with a gap of a predetermined size. Equipped with facing member It becomes Te, the inner diameter is equal to the one end and the other end of the swing pipe,
A fluid pumping device, wherein one end and the other end of the oscillating pipe have a relationship (simple solution) of the following formula (1). [Equation 1] However, D ₁ is the outer diameter of one end of the rocking pipe, D ₂ is the inner diameter of the rocking pipe, and D ₃ is the outer diameter of the other end of the rocking pipe. 2. A gate housing, which is supplied with a fluid therein, and which has a sliding plate having a pair of communication holes at one end, and a pair on the outer side of the communication hole of the sliding plate of the gate housing. And a fluid delivery means which is connected to each other and alternately sucks and discharges the fluid in the gate housing, and one end side of which is substantially S-shaped so that it can contact the sliding plate of the gate housing. An oscillating pipe that is located inside the gate housing and is supported so as to be rotatable around the axis on the other end side; and one end of the oscillating pipe of the oscillating pipe of the sliding plate of the gate housing. Switching means for rotating the rocking pipe around the axis on the other end side so as to communicate with either one, and face the peripheral edge of the other end of the rocking pipe with a gap of a predetermined size. Equipped with facing member It becomes Te, the inner diameter is equal to the one end and the other end of the swing pipe,
A fluid pumping device, wherein one end and the other end of the oscillating pipe have a relationship (exact solution) of the following expression (2). [Equation 2] However, D ₁ is the outer diameter of one end of the rocking pipe, D ₂ is the inner diameter of the rocking pipe, and D ₃ is the outer diameter of the other end of the rocking pipe.