JPS6132510B2 - - Google Patents

Description

[Detailed Description of the Invention] A pump device for fresh concrete that sucks fresh concrete or similar materials is disclosed in Japanese Patent Application No. 132445/1989 (Japanese Patent Application Laid-Open No. 89906/1989), which has already been proposed by the inventor of this application. It is known by
The present invention relates to a fluid distribution device for controlling the above-mentioned pump device for fresh concrete.

Next, the pump device will be briefly described. It consists of a pair of piston pumps mounted in parallel relation and acting in opposite phases, each piston pump having a reciprocating piston and a cylinder, and each piston pump cylinder having an open end. and a buttful plate valve means disposed at the open end thereof and having two operating limit positions for controlling the pouring and discharging of fresh concrete through each open end of the piston pump cylinder; a jack or a pair of hydraulic piston pumps for driving a piston pump and a source of pressurized fluid coupled to the buttful blade valve means and for controlling the position of the buttall blade valve means; a five-way fluid actuated distribution device with said source of pressurized fluid hydraulically connected between the fluid pressure piston cylinders for supplying pressurized fluid to the piston cylinders and discharging pressurized fluid from the fluid pressure piston cylinders; , the five-way fluid actuated distribution device supplies pressurized fluid to a first cylinder of the fluid pressure piston cylinder to initially move the buff-full valve means to one of its two restricted positions; a first operative position for discharging pressurized fluid from a second cylinder of the piston, and a second fluid pressure piston cylinder for initially moving the buttful valve means into another of the two restrictive positions. an actuation distribution device having a second working position for supplying pressurized fluid and discharging pressurized fluid from the first fluid pressure piston cylinder, and further for switching the actuation distribution device between its first and second working positions; means for hydraulically interlocking the piston interlock of the fluid pressure piston cylinder and restoring pressurized fluid to the hydraulic interlock means from which the fluid pressure piston pump and substantially correct reaction are provided; It has means to drain any excess of pressurized fluid to maintain the concrete pump in place. That is, in the pump device, the main control member for controlling the hydraulic control circuit of the system was composed of a five-way operation distribution device.

The present invention provides the aforementioned five-way actuation distribution device with two single-acting hydraulic piston cylinders and each cylinder having three
It consists of a device with two orifices, both cylinders acting in antiphase and providing for displacement by a device with interlocking movement. This device occupies much less space and is simpler and more responsive.

The present invention will be explained below based on drawings of embodiments. The pump device 1 consists of two single-acting piston pumps 2a and 2b with parallel axes, the cylinders 3a and 3b of which are mounted on a support at their end m (lower end seen in FIGS. 1 and 2). A full-blade valve (not shown) mounted for rotation around a pivot spindle (8 axes)
is located therein and communicates with a chamber having two limiting action positions, in one position of which the double-bladed valve communicates, for example, with the concrete supply conduit and the open end of the cylinder 3a, and also with a concrete A shipping conduit is installed to flow through the open end of cylinder 3b and vice versa.

According to the invention, the spindle 8 of the buff-blade valve is made integral with the pivot pin of the locking bar 80, which is part of the device of the invention and will be explained in more detail below.

12a and 12b have piston pumps 2a, 2b
A jack or two single acting hydraulic fluid pressure cylinders are shown mounted to reciprocate the respective pistons 11a, 11b of the pistons 11a, 11b.
a, 11b are common piston pumps 113a and 1
Coaxial pistons 25a, 2 through 13b, respectively.
5b.

A reversing electric valve is shown at 26 and a movably controlled deflection valve at 39 for phase-shifting the pumping device out of half a cycle. During the suction phase, cylinder 2b is placed in communication with the shipping conduit, while cylinder 2a, which is simultaneously performing a compression stroke, pushes during the half-cycle the previously suctioned material into the supply conduit for cleaning purposes. 31 is a pump for supplying a pressurized control fluid, such as oil, while 42 and 4 shown in FIG.
3 is a limit switch that controls the reverse rotation of the electric switching valve 26.

The configuration described above is explained in detail in Japanese Patent Application No. 132445-1973. Now, the five-way actuation distribution device of the pump device disclosed in Japanese Patent Application No. 13244/1986 is of the single-acting type, in particular consisting of hydraulic cylinders or jacks modified and interlocked and connected to various hydraulic circuits. However, the present invention replaces the five-way actuation distribution device with the device described below.

That is, it consists of two cylinders, designated 82a and 82b, with solid heads, whose pistons 83a and 83b extend their piston rods to the end of a locking bar 80, which is integrally formed with the pivot spindle 8 of the bushy-blade valve. The pistons 83a and 83b are connected through two pairs of spacing rings 85a and 85b having a predetermined thickness.
The pistons 83a, 83b are prevented from contacting their respective heads in their restricted positions, but on the contrary, in these positions they respectively limit the annular chamber between the piston ring surfaces, the internal surface of the cylinder and the facing heads. First orifices 87a, 87b and second orifices 86a, 86b are opened into the two pairs of annular chambers, respectively.

Piston rods 84a and 84b pass through the respective upper heads of cylinders 82a and 82b in a fluid-tight manner (depending on the location of the pump arrangement shown in the figures). Furthermore, third orifices 88a and 88b are respectively disposed below the respective pistons 83a and 83b placed in the upper limit positions through the side walls of the respective cylinders. The pipes 89a and 89b connect the second orifices 86a and 86b to the electric switching valve 26, and the pipe 90
a, 90b is the third orifice 88 in the deflection valve 39.
Connect a and 88b, respectively. A pipe 91 connects the first orifices 87a, 87b to each other, and a discharge pipe 92 branches from the pipe 91 and ends in the tank or storage tank 30. Pipe 93 serves to recirculate the liquid and lever 8
If the valve 81, manually operated by 1a, is reversed to stop the supply of pressurized fluid, pipes 94 and 94a will allow fluid to flow from the diverter valve 26 to the reservoir 30 or tank when the device is out of service. This is the part of the pipe that is designed to return.

FIG. 1 shows the situation just before the end of the concrete suction stroke into cylinder 2b, which cylinder puts the full-blade valve in communication with the concrete supply conduit, piston 11a is near the end of its compression stroke, and cylinder 2a Placed in concrete shipping pipe and distribution position. During this stroke, the piston 11b receives pressurized fluid;
In particular, it is supplied by the pump 31, the valve 81,
It is actuated by oil passing through motorized valve 26 (in the position shown in Figure 1) and into pipe 89b which enters cylinder 82b through orifice 86b. The fluid is then opened through an orifice 8
Balful blade valves control the inlet of concrete to the cylinders of the piston pumps 2a and 2b of the pumping device 1 and the outlet from the cylinders 2a, 2b of the piston pumps, since it can be discharged only after the passage of the piston 83b from 8b. However, if it cannot assume its restricted position, for example because its valve seat is partially obstructed by some foreign object, this pump device 1 cannot operate because it cannot open the orifice 88b. Can not.

When orifice 88b opens, pressurized oil passes to pipe 90b, a controlled deflection valve in the position shown in the drawing, passes through pipe 47b which enters orifice 74b, and moves piston 25b to piston 1 of pump 2b.
Increase along with 1b. At the same time, orifice 74
Oil is discharged from a, reaches pipe 47a, valve 39, and orifice 88a, passes through pipe 90a that enters cylinder 82a, from there flows out through orifice 87a, and then returns to storage tank 30 through pipe 92. . At the same time, orifice 6a acts as a drain or outlet orifice for oil from cylinder 82a. That's pipe 8
This is because it is connected to the conductive valve through 9a.
From this valve, oil flows into the storage tank 30 through two pipes 94, 94a. When the piston 11a reaches the lower limit end of its concrete compression stroke, the piston rod 41, which is parallel to the piston rod 113a by its free end 41a, actuates the switch 3 so that the direction of fluid flow in the hydraulic circuit is changed to the second
The conduction valve 26 is switched so that the flow direction is as shown in the figure.

When the pumping device 1 is stopped, the manual control lever 81a is actuated to change the valve 81 to its second limiting position and recirculate the oil to the tank or reservoir 30 through the pipes 93 and 94a.

Since this invention is constructed as described above,
The installation area is extremely small, the structure is simple, and it has an excellent effect of being easy to react.

Next, embodiments of this invention will be described below.

(1) A pump device for supplying fresh concrete is provided with a pair of piston pumps 2a and 2b installed in parallel and working alternately, each of which is equipped with a reciprocating piston and a cylinder, and each piston pump The cylinders 3a, 3a form an open end, and a buff-full valve means is disposed at the open end.
The pump cylinders 3a, 3b have two operating limits for placing the pump cylinders 3a, 3a in alternate positions, and the piston performs a suction stroke in communication with another cylinder communicating with the concrete supply conduit and the concrete shipping pipe. each driven by a single acting type jack or fluid pressure piston cylinder 3a, 3b;
Coaxially with the pump cylinders 3a, 3b, respectively, the pistons of each pair of pumps and the fluid pressure piston cylinders 3a, 3b are connected to a common piston rod 11.
3a, 113b, each said fluid pressure piston cylinder having a piston 11a, 11b.
are arranged upstream of the piston cylinders and connected to each other by pipes at their ends, and an orifice 74b is provided in the lower part of one of the fluid pressure piston cylinders for supplying and discharging pressurized fluid, in particular for fluid supply of oil. In order to place the pump in fluid communication with the fluid pressure piston cylinder, the hydraulic circuit serves as a suction phase, and an orifice 74a is also provided at the bottom of the other fluid pressure piston cylinder to communicate with the switching valve 39 and the actuation distribution device, and the hydraulic circuit serves as a suction phase. The distribution device consists of two hydraulic type jacks, which are provided relative to each other in opposite phases, and whose piston rods 84a and 84b are connected to the locking bar 8.
A pivot pin 8 is connected to the end of the locking bar 80 to control the supply and discharge of concrete to the concrete pumping device.
and the hydraulic piston cylinders 82a, 82b are integrated with the full blade valve.
form a solid head, each having an orifice near the head, the first orifice 8
7a and 87b are the piston cylinders 82a and 82 connected to each other by a pipe 91.
disposed near one end of the two ends of b,
A second orifice 86 arranged near the other end
a and 86b are respectively connected to two orifices arranged on one side of the four-way electric valve 26, while the other two orifices arranged on the opposite side of the electric valve 26 are connected to the oil pump 31. and a first of each said hydraulic piston cylinder 82a, 82b connected to a pipe for return to the supply reservoir of the oil pump and forming an oil distribution device at the location of said electric valve during operation of the pumping device.
and a third orifice 88a, 88b is further provided at a position intermediate the second orifice, each of said third orifices being disposed immediately downstream of the piston and connected when it reaches a limit position near the first orifice of the cylinder; The third orifice is connected to one of the orifices for supplying and discharging fluid to the fluid pressure piston cylinder, respectively, while a pipe connecting the first orifice connects the piston pump directly to the oil reservoir. A fluid distribution device for controlling a pump device for fresh concrete, characterized in that 92 is branched.

[Brief explanation of the drawing]

The figures show an embodiment of the device of the invention as applied to a pump device merely by way of example; FIGS. 1 and 2 illustrate the pump device in two different operating positions of the hydraulic circuit and its components in a circuit diagram. FIG. DESCRIPTION OF SYMBOLS 1... Pump device, 2a, 2b... Fluid pressure piston cylinder, 3a, 3b... Piston cylinder, 8
...Pivot pin, 26...Electric valve, 30...Storage tank, 3
1... Oil pump, 39... Deflection valve, 74a, 74
b... Orifice, 80... Locking bar, 82
a, 82b...Hydraulic piston cylinder, 83a, 8
3b... Piston, 84a, 84b, 113a, 1
13b...Piston rod, 86a, 86b, 87
a, 87b, 88a, 88b... Orifice, 89
a, 89b, 90a, 90b, 91, 92, 9
3, 94, 94a...pipe.

Claims (1)

[Claims] 1 Two cylinders are arranged in parallel and opposite in phase, and the piston rods of both cylinders are pivotally supported at both ends of a locking bar, which controls the supply and discharge of concrete to a pump device for fresh concrete. A predetermined number of orifices are provided in both cylinders, the first orifice being disposed near one end of each cylinder and connected to each other by pipes; A second orifice disposed nearby is connected by pipe to an orifice disposed on one side of the motor-operated valve, respectively;
Further, two orifices arranged on opposite sides of the electric valve are connected to an oil pump and a storage tank, and a third orifice is provided at an intermediate position between the first orifice and the second orifice, and is connected to the piston cylinder of the concrete pump device. 1. A fluid distribution device for controlling a pump device for fresh concrete, characterized in that the device is connected to an orifice for supplying and discharging fluid to the fresh concrete, and has a pipe branched directly from the orifice to an oil tank.