JPS6185589A - Pressure feed pump of ready-mixed concrete or the like - Google Patents

Abstract

PURPOSE:To continue a pressure feed stroke and increase the pressure feed quantity per hour by arranging three or more cylinders in parallel and operating them, with an insertion stroke, the pressure feed stroke, and a return strode staggered by one stroke in sequence. CONSTITUTION:Three or more discharge ports 14a, 14b, 14c are provided on the wall face of a tank 1 for ready-mixed concrete. A switching means 8 switching and connecting the discharge ports 14a, 14b, 14c in turn to a conveying line 6 is provided on the outside of this tank 1. In addition, cylinders 2a, 2b, 2c arranged to face the discharge ports 14a, 14b, 14c respectively are provided so as to constitute pressure feed pumps. These pressure feed pumps are operated in conjunction with the switching means 8. Thereby, individual pressure feed pumps are operated, with an insertion stroke connecting the cylinder to the discharge port, a pressure feed stroke, and a return stroke staggered by one stroke in sequence.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressure pump for fresh concrete, etc.
At least three or more cylinders are arranged in series so as to be positioned in the process of pumping fresh concrete, etc.,
This invention relates to a pump for pumping fresh concrete, etc., which can continuously pump fresh concrete, etc.

[Prior Art] Cylinder-type pressure pumps have been known as pressure pumps for pumping fresh concrete, earth and sand, and the like. As shown in FIGS. 11 to 13, this cylinder penetration type pressure pump has a penetration cylinder C that penetrates into the inner bottom of a hopper b that stores fresh concrete a and the like. When the penetration cylinder C is inserted into the fresh concrete a, the fresh concrete a is taken into the penetration cylinder C through its tip opening, as shown in FIG.

The tip of the penetration cylinder C is fitted into and connected to the cylindrical hopper seal part d that seals the concrete discharge port at the bottom of the hopper b (the above is the penetration stroke). Then the first
As shown in Fig. 3, a piston Q slides inside the penetration cylinder C while opening the gate valve e and communicating the penetration cylinder C and the discharge pipe (transfer line) f via the hopper seal part d.
is moved forward, and the fresh concrete a in the penetration cylinder C is force-fed to the discharge pipe f side (the above is the pressure-feeding process). Thereafter, as shown in FIG. 11, when the gate valve e is closed, the penetration cylinder C and the piston Q are retracted and returned to their original positions (
The above is the return stroke), and each of the above operation strokes (penetration, pressure feeding,
return) is repeated.

FIG. 14 is a chart showing the flow of each of the above-mentioned operation strokes, where the broken line shows the movement of the penetrating cylinder C, and the solid line shows the movement of the piston Q.

The state shown in FIG. 11, which has been returned to its original position, is the state at the time indicated by arrow i in the chart, and the state shown in FIG. 12 is the state indicated by arrow j in the chart. The states shown in FIG. 113 indicate the points indicated by the arrows in the chart.

Furthermore, the present applicant has previously proposed a concrete pump in Japanese Patent Applications 1987-144380 and 1982-146799. The purpose of this proposal was to increase the pressure a of fresh concrete per unit time and to smooth the pressure (2). It is a double-acting type with two units installed in parallel. In the case of this double-acting type, a single-acting valve is used as the gate valve e, and one end of the discharge pipe f is oscillated together with the oscillating valve, and this is connected to each of the above-mentioned pressure feeding devices as appropriate. It is designed to let you do so.

Figure 15 shows a chart of each operation stroke of a double-acting pressure pump that has two pressure pumps connected in parallel, with the broken line showing the movement of the penetrating cylinder and the solid line showing the movement of the piston. ing. As illustrated, the first pumping device and the second pumping device are operated with their operating strokes being shifted. That is, the pumping stroke of the second pumping device is performed between the return stroke and the penetration stroke of the first pumping device, and the pumping stroke of the first pumping device is performed between the return stroke and the penetration stroke of the second pumping device. are carried out, respectively, to increase the pumping amount of fresh concrete per unit time and to smooth out the pumping amount.

[Problems to be Solved by the Invention] By the way, in the case of a double-acting pressure pump in which two pressure feeding devices are installed in parallel, the time required for the pressure feeding stroke is equal to the time required for the return stroke and the penetration stroke, as shown in FIG. This is twice the time required for each. Originally, the pressure feeding stroke can be completed within approximately the same time as the return stroke and the penetration stroke, as shown in the single-acting type shown in FIG. However, the pressure feeding device has three steps: penetration, pressure feeding, and return.
In a pressure pump in which two pressure pumps are linked together to complete a cycle, even if the time required for the pressure stroke is equal to that of other strokes, only a waiting time will result. Therefore, the operating speed of the pumping stroke can be halved, thereby eliminating the waiting time, and thereby reducing the amount of wear on the penetration cylinder during the pumping stroke.

However, in a pressure pump in which two pressure feeding devices are linked together as described above, due to its structure, the capacity of each pressure feeding device cannot be fully demonstrated, and the operating efficiency of the pressure feeding devices is poor.

Therefore, even compared to single-acting type, the pumping amount is 1,
It can only be increased by 5 times, resulting in low cost barf.

[Object of the invention] The present invention has been made in consideration of the above circumstances, and its purpose is to enable continuous pumping of ready-mixed concrete, etc. using a cylinder, and to increase and smooth the pumping ω. To provide a pressure pump for fresh concrete, etc., which has a high measuring capacity and a high cost of 7 to 7 ounces.

[Summary of the Invention] In order to achieve the above object, the present invention includes a step in which a cylinder having a piston that can move forward and backward is provided in a tank, the cylinder is penetrated into the tank, and the cylinder is filled with ready-mixed concrete, etc. , the step of operating the piston to pump the fresh concrete filled in the cylinder to the transfer line, and the step of returning the piston and the cylinder inserted into the tank to their original positions after being pumped are sequentially repeated. In a pump for pumping concrete, etc., at least three or more cylinders are arranged in series so as to be arranged in parallel so that the cylinders are located in the stroke of pumping the fresh concrete into the tank, and the cylinders located in the pumping stroke are connected to the transfer line. A switching means is provided to connect these, and the strokes of each cylinder are staggered, so that the strokes of pumping the fresh concrete can be successively carried out, thereby enabling continuous pumping.

[Example] A first example of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a side cross section of a pressure pump for concrete, etc. according to the present invention, and FIG. 2 shows a plan cross section thereof. As shown in the figure, the pressure pump of the present invention includes a tank 1 for storing ready-mixed concrete a, and a cylinder 2a which is movable in the tank 1 and moves the ready-mixed concrete a filled in the tank 1 into a cylinder 2a.

A pressure-feeding device 4 that takes the fresh concrete a into 2b and 2c and pumps it with pistons 3a, 3b and 3c.
a, 4b, 4G, and the lead-out end 5 is connected to the transfer line 6 for fresh concrete a, and the introduction end 7 is connected to the above-mentioned pressure feeding device 4a, 4b.
, 4G cylinders 2a, 2b, 2c in sequence, and the tanks 1. Pressure feeding devices 4a, 4b,
It mainly consists of a common base 9 on which 4C etc. are installed.

The tank 1 has a cylindrical shape with a bottom, and an input port 10 for fresh concrete a is formed in the upper part of the tank 1.

Fresh concrete a is supplied to the tank 1 from a concrete mixer truck or batcher plant. tank 1
The support brackets 11a, 1 are inserted through the side walls of the support brackets 11a, 1.
1b, Ilc is attached. Support bracket I
The cylinders 2a, 2 of the pressure feeding devices jQi4a, 4b, 4G are attached to the support brackets 11a, 11b, 11c at equal intervals on the same circumference.
b and 2C are each inserted and supported. Bearings 1 are provided on the inner peripheral surfaces of the support brackets 11a, 11b, and 11c to allow the cylinders 2a, 2b, and 2G to move in the axial direction.
2 and a seal 13 for preventing leakage of fresh concrete a to the outside of the tank 1.

A support bracket 11a is provided on the side wall of the tank 1 opposite to the support brackets 11a, 11b, and 110.

Discharge ports 14a and 14i are arranged opposite to 11b and 11C, respectively.
4b, i4c are formed, and the outlet 14a,
14b and 14c have short tubular joints 15a and 15b.
, 15G are attached to the inside of tank 1.

The pressure feeding devices 4a, 4b, 4c are attached to the support bracket Il.
Cylinders 2a, 2b are supported by cylinders 2a, 11b, and 11G and are movable back and forth within the tank 1.

2C, penetration actuators 16a, 16b, 16c that reciprocate the cylinders 2a, 2b, 2C in the axial direction and penetrate into the tank 1, and the cylinder 2a,
It is composed of pressure feeding actuators 17a, 17b, and 17G that reciprocate the pistons 3a, 3b, and 3c in the pistons 2b and 2c. Openings 18a are provided at the tips of the cylinders 2a, 2b, and 2C.

i8b and 18G are formed, and by penetrating the cylinders 2a, 2-b, and 2G into the tank 1, the ready-mixed concrete a is taken into the cylinders 2a, 2b, and 2c, and the cylinders 2a, 2b, and 2G are Joints 15a, 15b, 15cl, whose tips are of the tank 1: fitting salles. At the base ends of the cylinders 2a, 2b, and 2G, brackets 19a, 19b, and 19c are attached.

The above-mentioned penetration actuators 16a, 16b, 1 are attached to 19G.
6C operating rods 20a, 20b, 20c are connected.

The penetration actuators 16a, 16b, and 16c are hydraulic cylinders, and their base ends are fixed brackets 218.21b fixed to the common base 9.

It is attached to 21G.

The pistons 3a, 3b, 3C slidably provided in the cylinders 2a, 2b, 2C are provided with pressure feeding actuators 17a, 17b of a hydraulic cylinder mechanism.

Actuating rods 22a, 22b, and 22c of 17c are connected to the actuator 17a for pressure feeding.

The common base 9 is also attached to brackets 23a, 23b, and 23c at the base ends of the common bases 17b and 17c.

That is, the pressure feeding devices 4a, 4b, 4c penetrate the cylinders 2a, 2b, 2c into the tank 1 and
, 2b, 2c, and the pistons 3a, 3b.

3C to force the fresh concrete a taken into the cylinders 2a, 2b, 2C, and the cylinder 2a penetrated by the pistons 3a, 3b, 3c after the pressure feeding,
2b and 2c are simultaneously returned to their original positions, and the operation is repeated in sequence. In the case of this embodiment, the order of penetration stroke → pressure feeding stroke → return stroke is repeated, and the operation strokes of the pressure feeding devices 4a, 4b, and 4G are shifted by one stroke.

The switching means 8 consists of a discharge pipe 24, a switching valve body 25, etc.
Discharge ports 14a, 14b, 14c1. : A valve seat 26 having a communicating hole is removed. The switching valve body 25 slides in close contact with the outside of the valve seat 26 to open the discharge port 14a.

14b, 14c are provided to open and close, as shown in FIG. A through hole 28 is formed to which the end 7 is connected.

As shown in FIGS. 1 and 2, the discharge pipe 24 has a stepped shape that is smoothly bent from the outlet end 5 to the inlet end 7. The rotating ring 27 is interposed between the outlet end 5 of the discharge pipe 24 and the valve seat 26, and is connected to the rotating shaft 2.
As the outlet end 5 rotates around 7, the introduction end 7 and the switching valve body 25 rotate integrally, and the introduction end 7 rotates to be connected to the discharge ports 14a, 14b, and 14G in sequence. ing. Further, the discharge pipe 24 is rotationally driven by a known driving means (not shown), such as a ratchet, a one-way clutch, or a gear drive by a motor, and the cylinders 2a, 2b, 2c are sequentially positioned in the above-described pressure stroke.
discharge ports 14a, 14b.

It is configured to be connected to 14G.

Next, the operation of this embodiment will be described.

By extending the operating rod 20a of the penetration actuator 16a of the pressure feeding device 4a, only the cylinder 2a is penetrated into the tank 1. At this time, fresh concrete a is taken into the cylinder 2b from the tip opening 18a of the cylinder 2a. When cylinder 2a is fully extended,
Its tip is fitted into the joint 15a, and the opening 18a
is fluid-tightly connected to the discharge port 14a. At this time, the piston 3a is kept waiting at a position near the opening 18 when the cylinder 2a is fully retracted, and the discharge port 14a is closed by the switching valve body 25 (the above is a penetration stroke). On the other hand, at the same time, the operation of the pressure feeding device 4a is reduced to 1.
The piston 3b of the pressure feeding device 4b, which has been installed to advance the stroke and has completed the penetration stroke, is actuated by the pressure feeding actuator 17b to the transfer line 6 side, and the ready-mixed concrete a taken into the cylinder 2b is moved. to pump.

At this time, the discharge pipe 24 of the switching means 8 is connected to the pressure feeding device 4b.
The cylinder 2b is connected to the discharge port 14b of the joint 15b into which the cylinder 2b is fitted (the above is the pressure feeding stroke).

On the other hand, at the same time, the pumping device 4b is in the pumping process.
In the pumping device 4C, which is installed so that its operation is one stroke ahead of the previous one, and the pumping stroke has been completed, the respective operating rods 20c and 22c of the penetration actuator 16C and the pumping actuator 17c are pulled back at the same time. The cylinder 2C and the piston 3C are retracted to the maximum extent and returned to their original positions. The outlet 14c of this sharpener is closed by a switching valve body 25 (this is the return stroke).

Each of the pressure feeding devices 4a, 4b, and 4c is operated repeatedly in the order of insertion, pressure feeding, and return, and each time the operation of each stroke is completed, the switching means 8 is driven to cause the discharge pipe 24 to be operated under pressure in the next stroke. Discharge ports 14a, 14b of pumping devices 4a, 4b, 4G located in the stroke.

14C, and the ready-mixed concrete a in the tank 1 is continuously pumped to the transfer line 6 without interruption. FIG. 5 shows each pressure feeding device 4a of the pressure pump operated as described above.

4b, 4c, and a chart diagram showing the flow of operating states of switching means 8. FIG.

That is, in this example, three pressure feeding devices 4 are installed on the side wall of the tank 1.
a, 4b, and 4c are arranged in parallel on concentric circles at equal intervals, and the operating strokes of the pumping devices 4a, 4b, and 4G are shifted by one stroke to operate them simultaneously and at the same speed. Each time the operation of one stroke is completed, the rotary switching means 8 is scanned, and in the next stroke, the cylinders 2a, 2b, 2c of the pumping devices 4a, 4b, 4c positioned in the pumping stroke are transferred. Connect line 6 sequentially.

Therefore, as shown in the chart of FIG.
It is possible to fully demonstrate the ability of c. Furthermore, idle time (standby time) of each pressure feed H@4a, 4b, 4G
It is possible to eliminate the
a, 4b.

It can be continued without interruption with 4C.

For this reason, the pressure pump delivers 1 pressure per unit time! The conventional double-acting type equipped with two pumping devices could only increase the pumping amount by 1.5 times compared to the single-acting type. Base pumping device 4a, 4
By combining b and 4c, the pumping amount can be tripled,
You can improve the cost efficiency. Also, if you change your perspective and keep the pumping amount the same as before,
Since each pumping device 4a, 4b, 4c can be operated at a low operating speed, the amount of wear on the cylinders 2a, 2b, 2G and pistons 3a, 3b, 3c, etc. can be reduced to a certain extent to maximize their durability. It becomes possible to improve the performance. In addition, if the operating speed is to be the same as the conventional one, the pressure feeding devices 4a, 4b,
4c can be made as small as possible.

Furthermore, as shown in FIG. 3, the shape of the bottom of the tank 1 is aligned with the outer periphery of the cylinder inserted into the tank 1 (the figure shows joints 15a, 15b, and 15c into which the cylinders are fitted). By shifting the molding process, the amount of residue of fresh concrete a in the tank 1 can be reduced as much as possible.

Next, a second embodiment (FIGS. 6 to 8) of the present invention will be described. The second embodiment will be described below mainly with respect to its differences from the first embodiment. The major difference between this embodiment and the first embodiment is that the first embodiment is an external valve type in which the switching means 8 is provided outside the tank 1, whereas in this embodiment, the switching means 8 is provided outside the tank 1. 1 is an inner valve type. In the figures, common parts are given the same reference numerals.

As shown in FIGS. 6 to 8, the side wall of the tank 1 has insertion holes 31a, 31b for the cylinders 2a, 2b, and 2G.
31G is formed. These insertion holes 31a, 31b, 31
A support bracket 11a is connected to the outside of the tank 1 and is connected to the support bracket 11a.
, 11b, 11C are removed, and the pumping devices 14a, 4b,
4c cylinders 2a, 2b, 2c are inserted and supported.

The discharge pipe 24 of the switching means 8 is connected to the support brackets 11a, 1
1b, 11c and the opposing tultan'; t 1 (1')
(The discharge pipe 24 inserted through the 1111 wall and inserted into the tank 1 has a smoothly bent stepped shape.The discharge pipe 24 can be rotated around the rotation axis 27. The rotating shaft 27 is attached to the tank 1 via bearings 32 and 33.
Though not shown, a known driving means for rotating the discharge pipe 24 is provided at the end 5 of the discharge pipe 24 for introducing the ready-mixed concrete a. 27 and is rotated around the insertion hole 3 of the tank 1.
1a, 31b, and 31c.

The introduction end 7 has insertion holes 31a and 31b.

31G, a cylindrical sealing member 3
4 is fitted. Sealing member 34 on the outer periphery of the introduction end 7
A seal member 35 is provided on the inner circumference. The adhesion force of the sealing member 34 to the sheet 36 is generated by the pressure inside the pipe, and in order to provide supplementary or initial adhesion force, an elastic body 3 is provided between the introduction end 7 and the flange portion at the tip of the sealing member 34.
7 is interposed.

Next, the operation of the second embodiment will be described.

By extending the operating rod 20a of the penetration actuator 16a of the pressure feeding device W4a, the cylinder 2a penetrates into the tank 1, and at that time, the opening 18 at the tip of the cylinder 2a is opened.
Fresh concrete a is taken into the interior from a. At this time, the piston 3a is kept stationary in the insertion hole 31a (this is the penetration stroke).

Meanwhile, at the same time, the cylinder 2b and the piston 3b are integrally retreated from the pumping device 4b, which has been extended to the maximum extent and its penetration stroke has been completed, and the fresh concrete is poured into the cylinder 2b. The cylinder 2b is pulled out of the tank 1 while being filled with a and returned to its original position (return process).

On the other hand, at the same time, the return stroke ends and cylinder 2C
For the pumping device 4c, which had been returned to its original position with the ready-mixed concrete a filled inside, the actuating rod 22G of the pumping actuator 17G is extended to drive the piston 3C. At this time, the cylinder 2C of the pressure feeding device 4C
The discharge pipe 24 of the switching means 8 is introduced into the insertion hole 31c of
7 is connected, and the fresh concrete a filled in the cylinder 2C is pumped to the transfer line 6 (pressure feeding process).

Thereafter, when one stroke of each of the pressure feeding devices 4a, 4b, 4c is simultaneously completed, the switching means 8 is activated, and the introduction end 7 of the discharge pipe 24 is positioned in the next pressure feeding stroke of the pressure feeding device (i.e. , is connected to the insertion hole 31b of the cylinder 2b of the pressure feeding device) 4b whose return stroke has been completed.

That is, the pressure pump of this embodiment has the respective pressure feeding devices 4a and 4b as shown in the chart of FIG.

The 4G operation stroke is operated by shifting one stroke at a time, and the operation stroke is operated repeatedly in the order of penetration → return → pressure feeding, and at the end of each stroke, the switching means 8 is operated to transfer the ready-mixed concrete a. Pressure feed to line 6. Therefore, the pumping amounts fa4a, 4b.

Although the operation of 4C and the order of its operation strokes are slightly different from those of the first embodiment described above, its effects are exactly the same as those of the first embodiment.

Note that in the first embodiment and the second embodiment, each pressure feeding device 4
For each of a, 4b, and 4c, the penetration actuator 16a,
16b, 16c and pressure feeding actuators 17a, 17b
, 17c are arranged in the same horizontal plane, but as shown in FIG.
Actuation rods 20a, 20a of each penetration actuator of
, 20b.

If 20b, 20c, and 20c are arranged on the same circumference, the pressure pump can be further downsized. 22
Reference numerals a, 22b, and 22c are operating pins of pressure feeding actuators that drive the pistons.

Further, the present invention is provided with at least three pressure feeding devices, and four or more pressure feeding devices may be provided and the switching means may be sequentially switched in correspondence with the four or more pressure feeding devices.

[Effects of the Invention] As described above, the present invention exhibits the following excellent effects.

(1) The pumping stroke of the cylinder can be made continuous, and ready-mixed concrete can be pumped continuously.

In addition, by making the pumping stroke continuous without interruption, it is possible to increase the pumping amount per unit time of the pump.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a first embodiment of a pressure pump for concrete, etc. according to the present invention, FIG. 2 is a plan sectional view thereof,
Figure 3 is a view taken along the ■-■ line in Figure 1, and Figure 4 is a view of r in Figure 1.
V-1'V line arrow diagram, FIG. 5 is a chart showing the flow of the operating state of the pressure pump of the first embodiment, and FIG. 6 shows the second embodiment of the pressure pump according to the present invention. Side sectional view, 7th
The figure is a plan sectional view, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 6, FIG. FIG. 10 is a diagram showing a modification of the arrangement of the penetration actuator and the pumping actuator,
FIGS. 11, 12, and 13 are side sectional views for explaining the operation of a conventional single-acting cylinder penetrating pump;
Figure 14 is a chart showing the flow of the operating state of a conventional single-acting cylinder intrusion pump, and Figure 15 is a double-acting (two-acting) pressure pump.
FIG. 2 is a chart showing the operation flow of the interlocking cylinder penetrating pump. In the figure, 1 is a tank, 2 a, 2 b, 2 c
Lt cylinder, 3a, 3b, 3c are pistons, 6 is a transfer line, and 8 is a switching means. Patent applicant: Ishikawajima Harima Heavy Industries Co., Ltd. Representative Patent Attorney Nobuo Kinutani Figure 9 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] A cylinder having a piston that can move forward and backward into a tank is provided, and the cylinder is penetrated into the tank to fill the cylinder with ready-mixed concrete, and the piston is operated to fill the ready-mixed concrete filled in the cylinder. In a pump that pumps ready-mixed concrete, etc. by sequentially repeating the step of pumping it to a transfer line and the step of returning the empty cylinder to its original position after pressure-feeding, the cylinder that is positioned in the step of pumping the ready-mixed concrete to the tank. A pump for pumping ready-mixed concrete, etc., characterized in that at least three pumps are arranged in parallel so as to be continuous, and a switching means is provided for connecting the cylinders located in the pumping stroke to the transfer line.