JPH0551067B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pump for pumping fresh concrete, etc., and in particular, the present invention relates to a pump for pumping fresh concrete, etc. The present invention relates to a pump for pumping ready-mixed concrete, etc., which can be installed to continuously pump ready-mixed concrete, etc.

[Prior Art] Cylinder-type pressure pumps have been known as pressure pumps for pumping fresh concrete, earth and sand, and the like. This cylinder penetrating pump is the 11th
As shown in Figures 1 to 13, it 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 penetrates 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 process). Next, as shown in FIG. 13, the gate valve e is opened to connect the penetration cylinder c and the discharge pipe (transfer line) f through the hotspot seal part d, and the piston g sliding inside the penetration cylinder c is advanced. Then, the fresh concrete a in the penetration cylinder c is pumped to the discharge pipe f side (the above is the pumping process). Thereafter, as shown in FIG. 11, when the gate valve e is closed, the penetration cylinder c
and the piston g are retracted and returned to their original positions (the above is the return stroke), and each of the above operating strokes (penetration/
pressure feeding and return) are repeated.

FIG. 14 is a chart showing the flow of each of the above-mentioned operation strokes, and the broken lines indicate the movement of the penetrating cylinder c.
The solid lines each indicate the movement of the piston g.
The state shown in FIG. 11 that 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 state shown in FIG. 13 indicates the time point indicated by the arrow k in the chart.

In addition, the applicant had previously proposed a "concrete pump" in Japanese Patent Application No. 59-144380 (Japanese Patent Application No. 61-25976) and Japanese Patent Application No. 59-146799 (Japanese Patent Application No. 61-25977). is doing. The purpose of this proposal was to increase the amount of fresh concrete pumped per unit time and to smooth out the amount of pumped concrete. Although not shown, a pumping device consisting of the above-mentioned penetrating cylinder c and piston g was installed in a tank. It is a double-acting type with two units installed in parallel. In the case of this double-acting type, a swinging valve is used as the gate valve e, and one end of the discharge pipe f is swinged together with the swinging valve to connect it to each of the pressure feeding devices as appropriate. It's becoming like that.

Fig. 15 shows a chart of each operation stroke of a double-acting pressure pump in which two pressure pumps are connected in parallel, and the broken lines indicate the movement of the penetrating cylinder.
The solid lines each indicate the movement of the piston. 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, the capacity of each pressure feeding device cannot be fully demonstrated due to its configuration, and the operating efficiency of the pressure feeding devices is poor. Therefore, even when compared with a single-acting type, the pumping amount can only be increased by 1.5 times, resulting in low cost performance.

[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 the amount of pumped concrete and smooth it. The purpose of the present invention is to provide a pump for pumping ready-mixed concrete, etc., which is highly efficient and cost-effective.

[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, and the cylinder is penetrated into the tank to fill the cylinder with ready-mixed concrete or the like. , 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 at equal intervals on the same circumference in the order in which they are located in the pumping stroke so that the cylinders are successively positioned in the stroke of pumping the fresh concrete into the tank. At the same time, a rotary switching valve is provided to connect these cylinders to the transfer line in the order in which they are located in the pressure-feeding stroke, and the strokes of each cylinder are staggered so that the strokes of pumping the ready-mixed concrete are successively carried out. It is designed so that it can be continuously pumped.

[Example] Hereinafter, a first example of the present invention will be described in detail based on 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 tank 1 that is movable forward and backward within the tank 1.
The ready-mixed concrete a filled in cylinder 2
A, 2b, 2c pumping device 4a, 4b, 4c which pumps the taken in fresh concrete a into the concrete a, 2b, 2c with pistons 3a, 3b, 3c; 7 is a switching means 8 which is sequentially connected to each cylinder 2a, 2b, 2c of the pressure feeding device 4a, 4b, 4c.
It mainly consists of a rotary switching valve, and a common base 9 on which the tank 1, pressure feeding devices 4a, 4b, 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 batch plant. Support brackets 11a, 11b, and 11c are attached to the side walls of the tank 1 so as to pass through them. Support brackets 11a, 11b, 1
1c are provided on the same circumference at equal intervals, and the cylinders 2a, 2 of the pressure feeding devices 4a, 4b, 4c are attached to these support brackets 11a, 11b, 11c.
b and 2c are respectively inserted and supported. Bearings 12 that allow the cylinders 2a, 2b, 2c to move in the axial direction and seals 13 that prevent the fresh concrete a from leaking out of the tank 1 are provided on the inner peripheral surfaces of the support brackets 11a, 11b, and 11c. It is being

On the side wall of the tank 1 opposite to the support brackets 11a, 11b, 11c, there are support brackets 11a, 11b, 11c.
Discharge ports 14 are provided opposite to 11b and 11c, respectively.
a, 14b, and 14c are formed, and short tubular joints 15a, 15b, and 15c are attached to the inside of the tank 1 to the discharge ports 14a, 14b, and 14c.

The pressure feeding devices 4a, 4b, 4c are cylinders 2a, 2 which are supported by the support brackets 11a, 11b, 11c and are movable back and forth within the tank 1.
b, 2c, and penetration actuators 16a, 16b, 16c that reciprocate in the axial direction of the cylinders 2a, 2b, 2c to penetrate into the tank 1.
And pistons 3 in cylinders 2a, 2b, 2c
It is composed of pressure feeding actuators 17a, 17b, and 17c that reciprocate the actuators 17a, 3b, and 3c. Openings 1 are provided at the tips of the cylinders 2a, 2b, and 2c.
8a, 18b, 18c are formed, and by penetrating the cylinders 2a, 2b, 2c into the tank 1, the ready-mixed concrete a is taken into the cylinders 2a, 2b, 2c, and the cylinder 2
The tips of a, 2b, and 2c are fitted into the joints 15a, 15b, and 15c of the tank 1, respectively. Further, mounting brackets 19a, 19b, 19c are attached to the base ends of the cylinders 2a, 2b, 2c.
The above-mentioned penetration actuator 16 is attached to 9b and 19c.
Actuation rods 20a, 20 of a, 16b, 16c
b, 20c are connected.

Penetration actuators 16a, 16b, 16c
is a hydraulic cylinder, the base end of which is fixed to the fixed brackets 21a, 21 fixed to the common base 9.
b, 21c.

The pistons 3a, 3b, 3c slidably provided in the cylinders 2a, 2b, 2c are equipped with pressure feeding actuators 17a, 17 of the hydraulic cylinder mechanism.
b, 17c operating rods 22a, 22b, 22c
are connected, and the pressure feeding actuator 1
The proximal ends of 7a, 17b, and 17c are also attached to mounting brackets 23a, 23b, and 23c of the common base.

In other words, the pressure feeding devices 4a, 4b, 4c perform a penetration stroke in which the cylinders 2a, 2b, 2c penetrate into the tank 1 and take in the ready-mixed concrete a into the cylinders 2a, 2b, 2c, and the pistons 3a, 3b,
3c is operated to forcefully feed the fresh concrete a taken into the cylinders 2a, 2b, 2c, and the pistons 3a, 3b, 3c after the pressure feeding and the penetrated cylinders 2a, 2b, 2c are simultaneously returned to their original positions. The operation is performed by sequentially repeating the return stroke. In the case of this example, penetration stroke → pressure stroke →
The return stroke is repeated in order, and each pumping device 4
The operating strokes of a, 4b, and 4c are each shifted by one stroke.

The switching means 8 consists of a discharge pipe 24, a switching valve body 25, etc., and a valve seat 26 having a through hole communicating with the discharge ports 14a, 14b, 14c is attached to the side wall of the tank 1 outside the discharge ports 14a, 14b, 14c. It is being The switching valve body 25 slides in close contact with the outside of the valve seat 26 to open the discharge ports 14a,
It is provided to open and close 14b and 14c,
As shown in FIG. 4, a through hole 28 is formed into a disk shape, the center of which is rotatably supported on the valve seat 26 by a rotating shaft 27, and the inlet end 7 of the discharge pipe 24 is connected to the through hole 28. It is formed.

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 shaft 27 is interposed between the outlet end 5 of the discharge pipe 24 and the valve seat 26, and as the outlet end 5 rotates about the rotating shaft 27, the inlet end 7 and the switching valve body 25 are connected to each other.
The introduction end 7 rotates and is connected to the discharge ports 14a, 14b, and 14c in sequence. The discharge pipe 24 is rotatably driven by a known drive means (not shown), such as a ratchet, a one-way clutch, or a gear drive by a motor, to discharge the cylinders 2a, 2b, 2c which are sequentially positioned in the aforementioned pressure stroke. Exit 14a, 1
4b and 14c.

Next, the operation of this embodiment will be described.

By extending the operating rod 20a of the penetration actuator 16a of the pumping device 4a, only the cylinder 2a penetrates into the tank 1. At this time, fresh concrete a is taken into the cylinder 2a from the tip opening 18a of the cylinder 2a. When the cylinder 2a is extended to the maximum, 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 the penetration stroke). On the other hand, at the same time, the pressure feeding device 4, which was installed so that its operation preceded the pressure feeding device 4a by one stroke, had completed its penetration stroke.
In b, the piston 3b is operated toward the transfer line 6 side by the pumping actuator 17b, and the fresh concrete a taken into the cylinder 2b is pumped. At this time, the discharge pipe 24 of the switching means 8 is connected to the discharge port 14b of the joint 15b into which the cylinder 2b of the pressure feeding device 4b is fitted (the above is the pressure feeding stroke).

On the other hand, at the same time, the pumping device 4c, which is installed so that its operation is one stroke ahead of the pumping device 4b which is in the pumping stroke, and which has completed its pumping stroke, operates the penetration actuator 16c and the pumping actuator 17c. The respective actuating rods 20c and 22c of the cylinders 20c and 22c are simultaneously pulled back and the cylinders 2
c and the piston 3c are retracted to the maximum extent and returned to their original positions. At this time, the discharge port 14c is closed by the switching valve body 25 (the above is a return stroke).

Each pressure feeding device 4a, 4b, 4c is operated repeatedly in the order of penetration → pressure feeding → return, and at the end of each stroke, the switching means 8 is driven and the discharge pipe 24 is switched to the pressure feeding stroke in the next stroke. Discharge ports 14a, 14b of pressure feeding devices 4a, 4b, 4c located in
14c, and the ready-mixed concrete a in the tank 1 is successively and pressure-fed 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 embodiment, three pumping devices 4a, 4b, 4c are arranged concentrically on the side wall of the tank 1 at equal intervals, and the operating stroke of each pumping device 4a, 4b, 4c is performed one stroke at a time. Stagger them 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.
By setting the operating speeds of the respective operating strokes of the pumping devices 4c at the same time, the capabilities of the pumping devices 4a, 4b, and 4c can be fully demonstrated. Furthermore, each pressure feeding device 4a,
4b, 4c can be eliminated, and the pumping process can be performed by three pumping devices 4a, 4.
b, 4c can be continued without interruption. Therefore, the amount of pumping per unit time of the pressure pump can be increased, and the amount of pumping per unit time of the conventional double-acting pump equipped with two pumping devices is 1.5 times that of the single-acting type. By providing the three pumping devices 4a, 4b, and 4c, the amount of pumping can be tripled, which previously could only be increased, and the cost efficiency can be improved. Also, if you change your perspective and keep the pumping amount the same as before,
Since each pressure feeding device 4a, 4b, 4c can be operated at a low speed, the cylinders 2a, 2
b, 2c, pistons 3a, 3b, 3c, etc., and their durability can be improved as much as possible. Furthermore, if the operating speed is made equal to that of the conventional one, it becomes possible to downsize the pumping devices 4a, 4b, 4c as much as possible.

Furthermore, as shown in FIG.
b, 15c are shown. ), the amount of residual fresh concrete a in the tank 1 can be reduced as much as possible. Furthermore, three pumping devices 4a, 4b,
4c are placed on concentric circles at equal intervals, so
A rotary switching valve can be used as the switching means 8 for connecting each cylinder 2a, 2b, 2c and the transfer line 6, and the ready-mixed concrete can be continuously pumped with a valve having a simple mechanism. In addition, each cylinder 2a, 2
b and 2c are arranged at equal intervals on the same circumference in the order in which they are placed in the pressure feeding stroke, so the switching operation of the rotary switching valve from the cylinder after the end of the pressure feeding stroke to the cylinder in the next pressure feeding stroke is easy. Since this is performed by constant operation, the operation of the rotary switching valve is easy to control.

Next, the second embodiment of the present invention (Figs. 6 to 8)
Figure). 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 in the first embodiment, the switching means 8 is connected to the tank 1.
In this embodiment, the switching means 8 is provided inside the tank 1 and is an inner valve type, whereas the switching means 8 is provided outside the tank 1 and is an external 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 through holes 31 for the cylinders 2a, 2b, and 2c.
a, 31b, and 31c are formed. This insertion hole 3
Support brackets 11a, 11b, 11c are attached to the outside of the tank 1 in communication with the support brackets 11a, 11b, 31c.
The cylinders 2a, 2b, 2c of the pressure feeding devices 4a, 4b, 4c are inserted and supported in the cylinders b, 11c.

The discharge pipe 24 of the switching means 8 is connected to the support bracket 1
1a, 11b, and 11c, and the discharge pipe 24 inserted into the tank 1 has a smoothly bent step-shaped shape. The discharge pipe 24 can rotate around a rotating shaft 27, and the rotating shaft 27 is attached to the tank 1 via bearings 32 and 33. Further, although 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.
The fresh concrete introduction end 7 of the discharge pipe 24 is rotated around the rotating shaft 27 and inserted into the insertion hole 31 of the tank 1.
a, 31b, and 31c.

The introduction end 7 has insertion holes 31a, 31b,
A cylindrical sealing member 34 is fitted so as to be able to be liquid-tightly connected to 31c. A sealing member 35 is provided on the inner peripheral portion of the sealing member 34 on the outer periphery of the introduction end 7 portion. Further, the adhesion force of the sealing member 34 to the sheet 36 is generated by the pressure inside the pipe, but in order to provide auxiliary or initial adhesion force, the introduction end 7 and the sealing member 36 are
An elastic body 37 is interposed between the flange portions at the four ends.

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

By extending the actuating rod 20a of the penetration actuator 16a of the pressure feeding device 4a, the cylinder 2a penetrates into the tank 1, and at this time, the ready-mixed concrete a is taken into the interior through the opening 18a at the tip of the cylinder 2a. At this time, the piston 3a
is kept stationary in the insertion hole 31a (the above is the penetration process).

On the other hand, at the same time, the cylinder 2b and the piston 3
b are integrally retreated, and the cylinder 2b is pulled out of the tank 1 and returned to its original position while the cylinder 2b is filled with fresh concrete a (return process).

On the other hand, at the same time, the pressure feeding device 4c, which had completed its return stroke and was returned to its original position with the ready-mixed concrete a filled in the cylinder 2c,
Actuation rod 22c of pressure feeding actuator 17c
is extended to drive the piston 3c. At this time, the insertion hole 3 of the cylinder 2c of the pressure feeding device 4c
The introduction end 7 of the discharge pipe 24 of the switching means 8 is connected to 1c, and the ready-mixed concrete a filled in the cylinder 2c is pumped to the transfer line 6 (pressure feeding stroke).

After that, each pressure feeding device 4a, 4b, 4c
When the individual strokes are completed simultaneously, the switching means 8
is operated, and the introduction end 7 of the discharge pipe 24 is connected to the insertion hole 31b of the cylinder 2b of the pumping device 4b positioned for the next pumping stroke (that is, the pumping device whose return stroke has been completed).

In other words, the pressure pump of this embodiment has each pressure feeding device 4a, 4b,
4c is operated by shifting the operation stroke by one stroke, 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 pressure feeding devices 4a, 4
Although the operations of b and 4c and the order of their operation steps are slightly different from those of the first embodiment described above, the effects thereof are exactly the same as those of the first embodiment.

In the first embodiment and the second embodiment, the penetration actuators 16a, 16b, 16c and the pressure feeding actuators 17a, 17b, 17c are arranged in the same horizontal plane for each pressure feeding device 4a, 4b, 4c. However, as shown in FIG.
By arranging b, 20b, 20c, and 20c on the same circumference, the pressure pump can be made more compact. Reference numerals 22a, 22b, and 22c are actuating rods for 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] In summary, the present invention exhibits the following excellent effects.

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

(2) In addition, the pumping stroke can be continued without interruption to increase the pumping amount per unit time of the pump.

(3) Furthermore, the simple mechanism of the rotary control valve allows continuous pressure feeding of fresh concrete with easy operation control.

[Brief explanation of the drawing]

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, and FIG. 3 is a view taken along the - line in FIG.
Figure 4 is a view taken along the - line in Figure 1, and Figure 5 is a view of Figure 1.
FIG. 6 is a side sectional view showing the second embodiment of the pressure pump according to the present invention, FIG. 7 is a plan sectional view thereof, and FIG. is a sectional view taken along the - line in FIG.
10 is a diagram showing a modification of the arrangement of the penetration actuator and the pressure feeding actuator, FIG. 11, FIG. 12, and FIG. Fig. 13 is a side sectional view for explaining the operation of a conventional single-acting cylinder penetrating pump, and Fig. 14 is a chart diagram showing the flow of the operating state of a conventional single-acting cylinder penetrating pump. FIG. 15 is a chart showing the operation flow of a double-acting (two-acting) type cylinder penetration type pressure pump. In the figure, 1 is a tank, 2a, 2b, 2c are cylinders, 3a, 3b, 3c are pistons, 6 is a transfer line, and 8 is a switching means.

Claims (1)

[Claims] 1 A process in which a cylinder is provided with a piston that can move forward and backward into a tank, and the cylinder is penetrated into the tank to fill the cylinder with ready-mixed concrete, etc., and the process of operating the piston to fill the ready-mixed concrete into the cylinder. In a pump that pumps ready-mixed concrete, etc. by sequentially repeating the process of pumping the concrete to the transfer line and the process of returning the empty cylinder to its original position after pumping, the pump is located in the process of pumping the ready-mixed concrete to the tank. At least three or more cylinders are arranged in succession on the same circumference at equal intervals in the order in which they are located in the pressure feeding stroke, and a rotation that connects these cylinders to the transfer line in the order in which they are located in the pressure feeding stroke. A pressure pump for fresh concrete, etc., characterized by being equipped with a type switching valve.