JP4213272B2 - Squeeze type concrete pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a squeeze concrete pump in which concrete is sucked from one end of a pumping tube and discharged from the other end by squeezing a pumping tube inserted into the pump casing with a squeeze roller.
[0002]
[Prior art]
The squeeze-type concrete pump has an inside of a pump casing 1 comprising a casing body 1a formed in a cylindrical shape and covers 1b for closing upper and lower ends of the casing body 1a, as shown schematically in FIG. The rotor 2 formed by fixing the central portions of the two upper and lower rotor plates 2a arranged in parallel to the main shaft 3 is incorporated, and the main shaft 3 can be freely rotated on the bearing 4 installed inside the upper and lower covers 1b. The roller shaft 5 is supported between the outer peripheral ends of the upper and lower rotor plates 2a facing each other at 180 °, the squeeze roller 6 is rotatably attached to the roller shaft 5, and the upper end of the main shaft 3 is supported. Is connected to the output shaft of the hydraulic motor 7 installed on the upper cover 1 a which is the upper surface of the pump casing 1, and the rotor 2 is rotated by driving the hydraulic motor 7. Thus, the squeeze roller 6 is revolved, and a cushion pad 8 is provided along the inner wall surface of the casing body 1a of the pump casing 1 and the pad 8 is provided along the pad casing 1 in the pump casing 1. In this way, both ends of the pumping tube 9 arranged in a U-shape are projected from the pump casing 1 to the outside, and one end serves as a suction port 10 and the other end serves as a discharge port 11, and the rotor 2 is rotated. The squeeze roller 6 is pressed against the pumping tube 9, and the intermediate region of the pumping tube 9 is continuously squeezed between the squeeze roller 6 and the pad 8 from a circular shape to a flat shape, and is sucked from the suction port 10. The concrete 12 is discharged from the discharge port 11.
[0003]
The roller shaft 5 for supporting the squeeze roller 6 is an eccentric shaft and is mounted so as to be able to rotate and displace with respect to the rotor plate 2a. The squeeze roller 6 can be displaced in the radial direction by adjusting the amount of rotation displacement. Thus, the pressing force on the pumping tube 9 can be finely adjusted. Reference numeral 13 denotes a guide roller attached to the outer peripheral end of the rotor plate 2a so as to be in contact with the upper and lower surfaces of the pumping tube 9 in order to restore the flatly deformed pumping tube 9 to a circular shape.
[0004]
[Problems to be solved by the invention]
However, in the case of the squeeze-type concrete pump, the squeeze roller 6 is always pressed against at least a part of the pumping tube 9 and is deformed into a flat shape even when the concrete 12 is not discharged. Therefore, there is a problem that the pumping tube 6 is likely to be deteriorated in the deformed portion and the life is shortened.
[0005]
Therefore, the present invention is intended to prevent the progress of deterioration of the pumping tube during work stoppage and to improve the life of the pumping tube.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention accommodates in a pump casing a rotor in which the central part of two upper and lower rotor plates arranged in parallel is fixed by a main shaft so that the rotor can be driven to rotate. A roller shaft is supported at both ends of the rotor plate opposite to each other by 180 °, squeeze rollers are rotatably attached to both roller shafts, and an intermediate region of a pumping tube inserted in a U-shape in the pump casing is disposed in the rotor. In the squeeze-type concrete pump in which the concrete sucked from one end of the pumping tube is discharged from the other end by continuously squeezing with the revolution of the squeeze roller by the rotation of the squeeze roller, the both roller shaft support positions of the rotor plate to, and bored long holes of the required lengths along a radial direction of the rotor, the upper and lower of the roller shaft to the long hole The end slidably engaged, and a moving device for moving and adjusting the radial direction between the pressing position and the pressing release position along slide the by pumping tube squeeze rollers the roller shaft in the elongated hole, The upper and lower link arms attached to the upper and lower ends of both roller shafts so as to project to both sides of the revolving direction of the squeeze roller, the connecting rod attached between the projecting ends of the upper and lower link arms, and the position where the main shaft is sandwiched The rods are arranged so that the rods protrude from both ends and the ends of the rods are provided as two hydraulic cylinders connected to the connecting rods .
[0007]
When stopping the concrete discharge operation, the squeeze roller is moved from the squeezing position to the squeezing release position with respect to the pumping tube by sliding the roller shaft along the elongated hole inward in the radial direction by operating the moving device. To do. Thereby, the pumping tube is released from the state of being squeezed flat, and local deterioration is prevented.
[0008]
A squeeze roller moving device is attached between the upper and lower link arms attached to the upper and lower ends of both roller shafts so as to project to both sides in the revolution direction of the squeeze roller, and between the projecting ends of the upper and lower link arms. The hydraulic cylinder is configured by comprising a rod and two hydraulic cylinders arranged at positions sandwiching the main shaft and projecting the rod from both ends and connecting the tips of the rods to the connecting rods. By performing the telescopic operation, the movement adjustment between the squeeze roller pumping tube squeezing position and the squeezing release position can be easily and reliably performed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
1 (a), (b), and (c) show an embodiment of the squeeze concrete pump of the present invention, and in the same way as shown in FIG. The rotor 2 formed by fixing the central portion of the rotor plate 2a with the main shaft 3 is housed in a rotatable manner, and the roller shafts are respectively supported at both ends of the two rotor plates 2a facing each other at 180 °. A squeeze roller 6 is rotatably attached to both roller shafts, and an intermediate region of a pumping tube 9 inserted in a U shape in the pump casing 1 is continuously squeezed by the revolution of the squeeze roller 6 by the rotation of the rotor 2. In the squeeze-type concrete pump in which the concrete 12 sucked from one end of the pumping tube 9 is discharged from the other end, each roller shaft The roller shaft 14 is made of a normal non-eccentric shaft. On the other hand, a long hole 15 having a required length along the radial direction of the rotor 2 is provided at the support position of both roller shafts 14 at both ends of the upper and lower rotor plates 2a. The upper and lower ends of the roller shaft 14 are slidably engaged with the long hole 15, and the squeeze roller 6 is squeezed into the pumping tube 9 by sliding the roller shaft 14 along the long hole 15. A moving device 18 is provided for moving and adjusting the position outward in the radial direction and the position in the radial direction as the compression release position.
[0011]
The moving device 18 includes upper and lower link arms 16 attached to the upper and lower ends of the roller shafts 14 and inside the upper and lower rotor plates 2a so as to protrude to both sides in the revolving direction of the squeeze roller 6. The connecting rods 17 attached between the projecting ends of the upper and lower link arms 16 and the main shaft 3 are disposed so as to project the rods 20a from both ends, and the ends of the rods 20a are connected to the connecting rods. 17 is constituted by a hydraulic cylinder 19 as two actuators connected to 17.
[0012]
The hydraulic cylinder 19 is a double rod type in which two pistons 20 are slidably accommodated in the body, and rods 20a each having one end connected to each piston 20 are protruded from both longitudinal ends. Both rods 20a are extended from both ends by supplying pressure oil to one head side pressure chamber 19a between both pistons 20, and both rods 20a are contracted by supplying pressure oil to two rod side pressure chambers 19b. The body portion is fixed to the rotor plate 2a via the support member 21 so that the expansion and contraction operations of the two rods 20a are performed in synchronization, and the connecting rod 17 is expanded and contracted by the rods 20a. Then, the roller shaft 14 is slid in the radial direction along the long hole 15 via the link arm 16 so that the squeeze roller 6 is flattened on the pumping tube 9. Apart from location and the pumping tube 9 for constriction it is to be moved between a non-contact become squeezed release position.
[0013]
The hydraulic circuit for driving the hydraulic cylinder 19 includes two pressure oil supply / discharge pipes 22 and 23 connected to a hydraulic pump 25 and a tank 26 via a manual switching valve 24 at a position outside the pump casing 1. It is led into the main shaft 3 through a rotary joint 27 connected to the lower end of the main shaft 3, and further drawn out to the outside of the main shaft 3, and then branched to each head side pressure chamber 19a and each rod side of each hydraulic cylinder 19. Each is connected to the pressure chamber 19b.
[0014]
When the concrete 12 is discharged, in the state in which the hydraulic pump 25 is driven, the switching valve 24 is first switched to the a port side and then switched to the blocking position. In this case, when the switching valve 24 is switched to the a port side, the pressure oil is guided to the head side pressure chamber 19a via the pressure oil supply / discharge pipe 22 and the rods 20a are extended, so that the connecting rod 17 and the link The squeeze roller 6 is pushed radially outward of the rotor 2 through the arm 16 and the roller shaft 14 and is pressed against the pumping tube 9, whereby the pumping tube 9 is indicated by a solid line in FIGS. As it is, it will be in the state squeezed flat. Therefore, when the pressure oil is applied to the head-side pressure chamber 19a, or when the switching valve 24 is switched so that the pressure oil supply / discharge pipes 22 and 23 are both shut off, 19 can be maintained, so that the intermediate region of the pumping tube 9 is continuously squeezed from a circular shape to a flat shape by the revolution of the squeeze roller 6 accompanying the rotation of the rotor 2. The sucked concrete 12 is discharged from the discharge port 11.
[0015]
On the other hand, the switching valve 24 is switched to the b-port side when the concrete 12 is discharged. Thereby, since the pressure oil from the hydraulic pump 25 is supplied to the rod side pressure chamber 19b of the hydraulic cylinder 19 through the pressure oil supply / discharge pipe 23, each rod 20a is contracted, and the connecting rod 17, the link arm 16 and squeeze roller 6 is drawn inwardly in the radial direction of rotor 2 through roller axis 14 as shown by the alternate long and short dash line in FIGS. The Thereby, the flat squeezing by the pressing of the squeeze roller 6 is released from the pumping tube 9. Thereafter, by switching the switching valve 24 to the shut-off position so that the pressure oil pipes 22 and 23 are both shut off, the contracted state of the hydraulic cylinders 19 is maintained and the compressed release state of the pumping tubes 9 is maintained. It becomes like this.
[0016]
In this way, when the concrete 12 is not being discharged, the squeeze roller 6 and the pumping tube 9 can be kept in a non-contact state, and the pumping tube 9 is prevented from being pressed into a flat shape. Therefore, the progress of deterioration of the pumping tube 9 can be prevented, the life can be extended, and the cost required for maintenance can be reduced from this, and the hydraulic cylinder can be connected via the switching valve 24. By operating the expansion and contraction of the squeeze roller 19, the movement adjustment between the squeeze tube squeezing position and the squeezing release position of the squeeze roller 6 can be easily and reliably performed. By adjusting, as in the prior art, an operation such as adjusting the amount of rotational displacement of the roller shaft 5 as an eccentric shaft is performed. The teeth, it is possible to finely adjust the pressing force of the pumping tube 9 squeeze roller 6.
[0017]
FIG. 2 shows another embodiment of the present invention. In the same configuration as shown in FIGS. 1 (A), (B) and (C), two hydraulic oil supply / discharge pipes are provided in the hydraulic cylinder 19. 22 and 23, instead of switching the pressure oil supply / discharge system by switching operation of the switching valve 24, the rod-side pressure chamber 19b of each hydraulic cylinder 19 is opened and the head side Only one pressure oil supply / discharge pipe 28 is connected to the pressure chamber 19a, and pressure oil supply / discharge to the head side pressure chamber 19a through the pressure oil supply / discharge pipe 28 can be performed by operating the switching valve 24 '. It is a thing. In addition, the same code | symbol is attached | subjected to the same thing as shown to FIG. 1 (A) (B) (C).
[0018]
According to the present embodiment, when the discharge operation of the concrete 12 is stopped, the switching valve 24 'is switched to bring the pressure oil supply / discharge pipe 28 and the tank 26 into communication with each other. The compressed state of the pumping tube 9 is released, the pumping tube 9 becomes free, and the squeeze roller 6 can be moved radially inward to the squeezing release position of the pumping tube 9 by its own restoring force. Since the pressure oil supply / discharge system connected to 19 can be only one, the structure can be simplified.
[0019]
The present invention is not limited only to the above-described embodiment. In the above-described embodiment, the moving device for moving the squeeze roller 6 in the radial direction uses the hydraulic cylinder 19 as an actuator. Of course, the movement adjustment of the squeeze roller 6 may be performed by an electric method or a mechanical method, and various changes may be made without departing from the scope of the present invention.
[0020]
【The invention's effect】
As described above, according to the squeeze-type concrete pump of the present invention, the rotor formed by fixing the central part of the upper and lower two rotor plates arranged in parallel with the main shaft in the pump casing is rotatably stored. A roller shaft is supported on both ends of the two rotor plates opposed to each other by 180 °, squeeze rollers are rotatably attached to both roller shafts, and a pumping tube inserted in a U-shape in the pump casing. In the squeeze-type concrete pump, in which the intermediate region is continuously squeezed by the revolution of the squeeze roller by the rotation of the rotor, the concrete sucked from one end of the pumping tube is discharged from the other end. In the roller shaft support position, a long hole of the required length is drilled along the radial direction of the rotor, The upper and lower end portions of the roller shaft into the elongated hole so slidably engaged, and moves the roller shaft is slid along the long hole of the squeeze roller in the radial direction between the pressing position and the pressing release position of the pumping tube The upper and lower link arms attached to the upper and lower ends of the roller shafts so as to protrude to both sides of the squeeze roller in the revolving direction, and the connection attached between the protruding ends of the upper and lower link arms. Since the rod is arranged at a position sandwiching the main shaft, the rod is projected from both ends, and the tip of each rod is connected to each connecting rod . When the concrete discharge operation is stopped, the squeeze roller can be moved to the squeezing release position of the pumping tube by the moving device. It is possible to prevent the tube from being pressed into a flat shape, thus preventing the deterioration of the pumping tube and improving the service life. In addition, it is possible to finely adjust the pressing force of the squeeze roller to the pumping tube without adjusting the rotational displacement amount of the roller shaft as an eccentric shaft as in the prior art. The upper and lower link arms that exert the effect, and the squeeze roller moving device is attached to the upper and lower ends of both roller shafts so as to protrude to both sides in the revolution direction of the squeeze roller, and the protruding end portions of the upper and lower link arms The connecting rods installed between them and the main shaft are placed so that the rods protrude from both ends, and the tip of each rod Since it has a structure consisting of two hydraulic cylinders coupled to the respective connecting rod, be performed easily and reliably the movement adjustment between the pumping tube pressing position and pressing release position squeeze roller Demonstrate the effect that you can.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a squeeze-type concrete pump according to the present invention. (A) is a schematic cut plan view, (B) is a schematic cut side view, and (C) is an AA of (A). It is an enlarged arrow view.
FIG. 2 shows another embodiment of the present invention and corresponds to FIG.
FIGS. 3A and 3B show an outline of an example of a conventional squeeze concrete pump, where FIG. 3A is a cut plan view and FIG. 3B is a cut side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump casing 2 Rotor 2a Rotor plate 3 Main shaft 6 Squeeze roller 9 Pumping tube 12 Concrete 14 Roller shaft 15 Long hole 16 Link arm 17 Connecting rod 18 Moving device 19 Hydraulic cylinder 20a Rod

Claims (1)

In the pump casing, a rotor formed by fixing the central part of two upper and lower rotor plates arranged in parallel with a main shaft is housed so as to be rotationally driven, and rollers are provided at both ends of the two rotor plates facing each other at 180 °. Each shaft is supported, squeeze rollers are rotatably attached to both roller shafts, and the intermediate region of the pumping tube inserted in a U-shape in the pump casing is continuously squeezed by the revolution of the squeeze roller by the rotation of the rotor In the squeeze-type concrete pump in which the concrete sucked from one end of the pumping tube is discharged from the other end, the required length of the rotor plate along the radial direction of the rotor is set at the support position of both roller shafts of the rotor plate. and bored by the long hole, the long hole slidably engaged with the upper and lower end portions of the roller shaft, and The movement device for moving and adjusting the radial direction between the serial roller shaft is slid along the long hole squeeze rollers and squeezing position of the pumping tube and the pressing release position, the squeeze roller at the upper and lower portions of the both roller shaft The upper and lower link arms attached so as to project to both sides of the revolving direction, the connecting rod attached between the projecting ends of the upper and lower link arms, and the position where the main shaft is sandwiched so that the rod protrudes from both ends. A squeeze-type concrete pump comprising a structure comprising two hydraulic cylinders connected to the connecting rods at the tips of the rods .

Images