KR820000158B1 - Flow-way changing valve device for concrete pump - Google Patents

Abstract

In a valve for changing over concrete material passage, a rotational frusto-conical valve body(6) is provided in a hopper(5). The interior of the valve body is provided with curved circular concrete material intake(10a) and discharge passages(9a). The openings(9b,10b) are alternately connected with openings of double cylinders(1,2) having pistons(3,4) by rotating the valve body. The other end of the discharge passage is rotatably connected to a pipe(15) to supply the concrete material into the outside of the hopper.

Description

Flow switch valve device for concrete pump

1 is a side view of a concrete pump having a device according to a first embodiment of the invention.

2 and 3 are co-sectional views.

4 is a perspective view of a valve body that forms part of the apparatus according to the present invention.

5 is a perspective view of a valve body that forms part of an apparatus according to a second embodiment of the present invention.

The present invention relates to a flow path switching valve device in a piston-type concrete pump having two concrete cylinders.

Conventionally, this type of valve device is provided with pistons in two concrete cylinders, which are connected to each other, and actuate them alternately, while simultaneously closing the suction hole and the discharge pipe with a flopper valve, thereby removing the raw concrete. A device for dispensing or two cylinders each provided with a piston as described above are provided in a hopper, and a discharge pipe oscillated in cooperation with the piston in the hopper includes the two cylinders and an inlet / outlet port. There was a device for discharging concrete while communicating with each other alternately.

However, in recent years, the raw concrete poured by concrete pumps is more likely to be poorly mixed, and this trend will continue in the future.

In the case of using the raw concrete of the empty mixture, it is necessary to reduce the loss of power so that there is no resistance in the operation of the pressure feed and suction flow paths and the directional valve.

By the way, in the conventional concrete pump of the type which uses the former rapper wrapper valve, there exists a problem in the pressure-suction suction property by the structure, and also has a problem in durability. In addition, the latter conventional type has a pressure-sorption suction resistance secondly to the operation of the directional control valve, and in particular, when the raw concrete of the empty mixture is used, a considerable amount of power is required to move the discharge pipe in the hopper. In addition, there are problems such as weak rigidity as a whole.

The present invention solves all the problems in the conventional apparatus by changing the flow path switching valve body located in the hopper in the shape of conical shape in the light of the above point, when the flowability and suction properties are good, when switching the flow path It is an object of the present invention to provide a flow switching valve device for a concrete pump having a very small resistance and sufficient durability.

Hereinafter, a concrete pump having a flow path switching valve device according to the present invention will be described with reference to the first embodiment of FIGS. 1 and 2 are parallel concrete cylinders with pistons 3 and 4 respectively.

The inlet and outlet ports 1a and 2a of the cylinders 1 and 2 are connected to and opened in a hopper filled with fresh concrete, and inside the hopper 5, a flow path switching valve body 6 to be described later is used to prevent the cylinders 1, 2, hopper frame 7 and leakage. The membrane is connected to the rotating material via a float seal 8.

In addition, an outer shape of the flow path switching valve body 6 is in the shape of a tannery cone, which is a rotating body, and there are discharge holes 9 and suction holes 10 formed therein, and one end of the torrent hole 9 is provided at the top of the valve body 6. The discharge port 9a has the central axis of the valve body 6 as the center of the mirror, and the other end of the discharge hole 9 is the discharge opening 9b which opens to the bottom face of the valve body 6.

Another end of the suction hole 10 is a suction port 10a formed at one side of the side wall surface of the valve body 6, and the other end is a suction opening 10b opening to the bottom surface of the valve body 6.

Both the discharge holes 9 and the suction holes 10 are circular flow paths having a diameter from the beginning to the end, and the discharge openings 9b and the suction openings 10b are opened at positions symmetrical in the radial direction with respect to the center of the bottom surface of the valve body 6; The inlet and outlet ports 1a and 2a of the cylinders 1 and 2 are in communication with each other. 11 is a rotational axis protruding from the bottom of the valve body 6 on the center line of the valve body 6, that is, the axis of rotation axis, and the biaxial 11 penetrates the hopper frame 7 and the float chamber 8 in the middle of the left and right cylinders 1 and 2. The end portion thereof is interlocked and connected to the reciprocating rotation operation material via an operation arm 12 and an operator 13 such as a hydraulic cylinder or a hydraulic motor to rotate the valve body 6. The discharge port 9a is a pressure feed pipe via a taper pipe 14. It is connected to 15 and meeting materials. 16 is a stirring plate called paddle which stirs the raw concrete in the hopper to prevent its solidification and promotes suction of the raw concrete, and is appropriately protruded on the outer circumference of the valve body 6.

Next, the operation of the apparatus will be described. First, as shown in Figs. 1 to 2, the piston 3 is on the right side in the drawing in the state in which the inlet and outlet 1a of the cylinder 1 and the outlet 9b of the valve body 6 and the inlet and outlet 2a and the inlet 10b of the cylinder 2 are in communication with each other. When the piston 4 moves to the left direction at the same time, the concrete already sucked into the cylinder 1 is transferred from the taper pipe 14 to the pressure feed pipe 15 via the discharge opening 9b and the discharge port 9a of the valve body 6.

The raw concrete filled in the hopper 5 at the suction port 10a of the valve body 6 is sucked into the cylinder 2 via the suction opening 10b. Next, by switching operation of the operator 13, the valve body 6 is rotated 180 degrees like the shaft 11, and this time, the inlet and outlet 1a and the inlet 10b of the cylinder 1, and the inlet and outlet 2a and the outlet 9b of the cylinder 2 communicate with each other. In this state, the piston moves in the opposite direction to the above, that is, the piston 3 moves in the left direction in the drawing, and when the piston 4 moves in the right direction, the piston moves into the cylinder 2 by the preceding piston operation. The raw concrete which has been sucked is transferred from the taper pipe 14 to the pressure feed pipe 15 via the discharge opening 9b and the discharge port 9a of the valve body 6. Concrete filled in the hopper at the suction port 10a of the valve body 6 is sucked into the cylinder 1 via the suction opening 10b.

Next, the valve body 6 is rotated 180 degrees about the shaft 11 by the switching operation of the operator 13 as described above, and again the inlet and outlet 1a and the outlet 9b of the cylinder 1 and the inlet and outlet 2a and the inlet 10b of the cylinder 2 Communicating. By repeating such an operation, the smooth concrete is continuously transferred.

Next, a second embodiment of a concrete pump having a flow path switching valve device according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part corresponding to 1st Embodiment mentioned above, and the description is abbreviate | omitted.

The valve body 6 has a tannery cone shape, which is a rotary body equivalent to the valve body according to the first embodiment described above, and has a discharge hole 9 and two suction holes 10, 10 ', respectively, formed therein.

The openings on the bottom face side of the discharge hole 9 and the suction hole 10, 10 ', that is, the discharge opening 9b and the suction opening 10b, 10b' are provided at the same distance in the radial direction from the center of the bottom surface of the valve body 6, respectively. The relationship is positioned such that the suction openings 10b and 10b 'sandwich the discharge opening 9b and the distances from the discharge opening 9b to each of the suction openings 10b and 10' are equal.

According to the second embodiment described above, the rotation angle of the 180 ° valve element required in the above-described first embodiment can be made less than 180 degrees. For example, when the angle from the center of the bottom face to the center of the diameter of each of the openings 9b, 10b, and 10b 'is 60 degrees, the switching operation can be performed at a rotation angle of 60 degrees.

In each of the above-described embodiments, the size of the suture portion, that is, the sliding portion, can be changed by the presence or absence of the hopper frame 7, and again, the abrasion resistant plate of the wear-resistant steel or the floating suture, etc. Combination of easily replaceable parts can cope with wear.

It is also possible to directly connect the concrete cylinders 1 and 2 and the valve body 6 by removing the hopper frame 7.

Further, in any of the above embodiments, the valve body can be configured to be used by extending the service life by reducing the gap between the parts to be sealed by sliding the valve body against the cylinder in response to wear. Again, in any of the above embodiments, a taper pipe 14 which is normally used can be omitted by attaching a gradient to the discharge hole 9 of the valve body 6 to reduce the flow path end area of the discharge port 9a axis and directly connect the discharge port 9a to the pressure feed pipe 15. have.

Again, in each of the above embodiments, the stirring plate 16 may be omitted.

As described above, according to the present invention, there is no functional effect described below.

In other words, in terms of priority transportability, the cross-sectional shape of the flow path cross section of the raw concrete is always unchanged in a circular shape, and the flowability is good because the flow path is less stiff and smooth and there is no need for a Y-tube. In addition, the flow path cross-section can always be a constant end face and the area can be made constant, but only the discharge hole can be a tapered cross section. In this case, the taper pipe has an effect that is unnecessary and has a low pressure loss in the flow path of the valve body.

Next, in terms of inhalation, the raw concrete in the hopper can be directly sucked in, and there is no change in swelling, cross-sectional area, cross-sectional shape, etc. of the flow path, and suction is good.

Next, in terms of the operation of the switching valve, the valve body is immersed in the raw concrete in the hopper, but is a rotary body such as a cone shape, and rotates about its central axis. There is no resistance to pushing the concrete. Compared with the pipe swing type, the directional valve itself is rigid and excellent in terms of reliability.

Next, in terms of durability, there are no drawbacks of the conventional flapper valve in which the portion to be sealed may be a pressurized oil and the wear is relatively small, but the structure is easy to take countermeasures as described above. In other words, it is possible to combine easy replacement parts such as wear-resistant pipes or floating seals in the sealing part, and the valve body is placed in the hopper by sliding the valve body to the cylinder side in response to wear and tear, so that some leakage can be allowed. There is an effect such as.

Next, since the structure is simple and can be designed compact, this valve can reduce the distance between the two suction cylinders and can be easily mounted on a chassis.

As described above, it is also possible to omit the data pipe.

That is, in the present invention, it has the effect of being able to design compactly because of its high pressure and suction, good operation of the switching valve, no resistance and rigidity, excellent reliability, high durability and simple structure.

Claims (1)

In a concrete pump having two concrete cylinders in parallel, a discharge hole and one end of which are opened so that one end of the valve body is opened to the top of the valve body and the other end of which is opened to the bottom surface of the valve body respectively. At least one suction hole is formed so as to be opened at the bottom of the valve, and at the predetermined rotational operation position of the valve body, the discharge hole and the bottom side opening of the suction hole are set to a position in communication with each suction port of the two concrete cylinders. The flow path switching valve device of the concrete pump, characterized in that.

Images