JPS6214716B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete pump that pumps fluid concrete to a concrete pouring site such as a building site or a construction site from a location remote from the concrete pouring site.

Conventionally, it was the first concrete pump of its kind.
As shown in the figure, a hopper 1 into which fluidized concrete A is poured, and a wall 2 of this hopper 1 that is connected to the inside of the hopper 1 and installed therein, and
A pair of cylinders 3 and 4 are used to suck and discharge the fluid concrete A inside the hopper 1, and one end of the cylinders 3 and 4 is swung with the other end as the center of oscillation. It consists of a swinging tube 5 that can be communicated alternately to either end, and the other end of the swinging tube 5 is connected to a feed pipe (not shown) connected to the driving site. It has been known. This concrete pump first sucks the fluid concrete A in the hopper 1 by the cylinder 4 that is not connected to the swinging pipe 5, and then swings the swinging pipe 5 to move the concrete A into the cylinder 4.
The cylinder 4 is then operated to discharge the sucked fluid concrete A into the swing pipe 5. At the same time, while the cylinder 4 is discharging, the fluid concrete A in the hopper 1 is sucked in by another cylinder 3 that is not in communication with the swing pipe 5, and the cylinder 4 is discharging it. When the operation is completed, the swinging tube 5 is swung in the opposite direction to communicate with the cylinder 3, and the cylinder 3 is then operated to discharge the sucked fluid concrete A into the swinging tube 5. By sequentially repeating the above operations, the fluidized concrete A in the hopper 1 is force-fed to the pouring site via the swing pipe 5 and the feed pipe. As described above, one end of the swinging tube 5 of the concrete pump constructed in this manner is moved along the inner wall of the hopper 1 by the swinging of the swinging tube 5, and the gap between is such that the discharged fluid concrete A does not leak into the hopper 1 during the discharge operation of the cylinders 3 and 4 or the rocking operation of the swing tube 5, and the discharged fluid concrete A is Because the interval is set to prevent backflow,
There was a problem in that the above-mentioned gap was enlarged due to wear due to friction with the inner wall of the hopper 1 and friction with the fluid concrete A.

To this end, an end member 6 such as a cap is disposed at one end of the swing tube 5, and a configuration is added to compensate for the gap caused by wear of the end member 6, thereby eliminating the above-mentioned problems. In an attempt to solve this problem, efforts have been made as shown in FIGS. 2 and 3. That is, in the structure shown in FIG. 2, the end member 7 is fixed to one end of the swing tube 6 so as to form an appropriate gap with the inner wall 2 of the hopper 1, and
The swing tube 6 is provided with an adjustment rod 8 extending above its swing center, and the adjustment rod 8 is rotatably and slidably supported by the wall portion 2. By sliding this adjustment rod 8 in the length direction with a nut 9 or the like, the gap between the end member 7 and the inner surface of the wall portion 2 is adjusted. Further, in the configuration shown in FIG. 3, the swing tube 10
An end member 11 is attached to one end so as to be slidable in the direction toward the inner surface of the wall 2, and this end member 1
A pressure receiving surface 13 is formed on the inner periphery of the cylinder 3 to form a recess 12 having a substantially V-shaped cross section with one end surface of the swinging tube 10. The internal pressure generated when the pipe 10 is discharged at the pressure shown by the arrow B acts on the pressure receiving surface 13 as shown by the arrow C, and the force component of this internal pressure C shown by the arrow D causes the end member 11 to be pushed against the wall 2. The gap between both the end member 11 and the wall portion 2 is corrected by sliding it toward the inner surface. Although these configurations have made it possible to correct the above-mentioned gap to some extent, the following problems still remain.

In other words, the wear at one end of the swing tube described above is
Because the swing tube swings in a circular arc, wear is greater on the side far from the center of the swing than on the side closer to the center of the swing, as shown by the two-dot chain line in Figures 2 and 3. The wear shape is inclined to the wall portion 2. Therefore, in both of the above-mentioned configurations, since the end members 7 and 11 are simply translated in parallel while maintaining their axial center positions, the gap between the worn parts of the end members 7 and 11 on the swing center side is reduced. Even if appropriate correction is made for the gap in the other worn part, the problem arises in that the gap in the other worn part is not corrected appropriately.

The present invention has been made in view of such conventional circumstances, and includes a slide sleeve being slidably attached to one end of the swing tube, and an end member being swingably supported by the slide sleeve. According to
It is an object of the present invention to provide a concrete pump that eliminates the above-mentioned conventional problems and can automatically correct uneven wear caused by wear of end members.

Hereinafter, this invention will be explained based on an embodiment shown in FIGS. 4 to 10 together with other constituent members.

In the figure, the reference numeral 21 indicates a concrete pump.
25 are fixed at appropriate intervals to the hopper 2.
A pair of feeding cylinders 26, 27 communicated within 2.
The open ends 24, 25 of the cylinders 26, 27 are arranged in the hopper 22, and one end is swung around a swing shaft 28 connected to the other end. The swing tube 2 is alternately communicated with
9, and a drive means 30 driven by pneumatic or hydraulic pressure, which swings the swing shaft 28 at a predetermined angle.
, a drive means (not shown) for operating the cylinders 26 and 27, and a drive means (not shown) disposed within the hopper 22 and rotated by an appropriate drive means (not shown) to control the flow in the hopper 22. It is composed of blades 31, 31, etc., which stir the concrete A of the shape.

Cylinders 26, 2 connected to the hopper 22
Pistons 32 and 33 are disposed inside the hopper 7 and are slid in the longitudinal direction by appropriate driving means, and suck the concrete A in the hopper 22 in response to the swinging of the swinging tube 29. Alternatively, the liquid is discharged into a connected swing tube 29. The swing tube 29 disposed within the hopper 22 is bent into a substantially crank shape, and one end thereof is
The opening ends 24 and 25 of the cylinders 26 and 27 are alternately matched with each other, so that they are alternately communicated with the cylinders 26 and 27. The other end of the cylinder 2 is attached to a side wall 34 opposite to the side wall 23 of the hopper 22 to which the cylinders 26 and 27 are fixed.
It is rotatably supported by a support member 35 that is fixed to be located above 6 and 27 (upper in the figure), and on the other end opposite to the support member 35 is the support member 35. A swing shaft 28 that is coaxial with the axis of 35 is connected to the swing shaft 28 . This swing shaft 28 is rotatably supported by a bearing 36 fixed to the side wall 23 of the hopper 22.
This protrusion 37 is connected to the drive means 30 via a crank mechanism 38. Therefore, the swing tube 29 swings about the swing shaft 28 and the other end supported by the support member 35 and the bearing 36, respectively. The end of the protrusion 37 of the swing shaft 28 is rotatably supported by a bearing 39 fixed to an appropriate location on the concrete pump 21, thereby restricting movement in the longitudinal direction. On the other hand, a slide sleeve 40 that is slidable in the direction toward the cylinders 26 and 27 is attached to one end of the swing tube 29, and an end member is attached to the side wall 23 side of the slide sleeve 40. 41 is swingably supported. This end member 41 is supported by a spherical convex portion 42 provided on the outer periphery of the end member 41.
and a spherical recess 43 provided on the inner periphery of the slide sleeve 40 are slidably brought into contact with each other, thereby allowing the slide sleeve 40 to swing. Further, the inside of the slide sleeve 40 is parallel to the end surface 44 of one end of the swing tube 29, and the swing tube 29
An inner surface 46 forming a gap 45 perpendicular to the axis of the
is formed. The above blades 31, 31...
A plurality of rotary shafts 47 are mounted radially above the swing tube 29 and on a rotating shaft 47 arranged substantially perpendicular to the swing tube 29. The rotating shaft 47 is rotatably supported at both ends by bearings 50 and 51 fixed to the side walls 48 and 49 of the hopper 22, and has one end protruding outside the hopper 22 so that it can be rotated as needed. The chain sprocket 52 is connected to a drive means (not shown). Further, the upper opening 53 of the hopper 22 is fitted with lids 55, 55 which are rotatably supported by a support shaft 54, and an opening 56 is formed below the hopper 22. At the same time, a lid device 57 allows the opening 56 to be opened and closed from the outside of the hopper 22.
is attached to the outer lower part of the hopper 22 so as to be rotatable by hinges 58, 58, etc., and to be locked in the closed position by a locking means 59. Further, those indicated by the symbols 60, 60...... are the swing shafts 2
8 or vanes fixed radially near the other end of the swing pipe 29; 61 is a concrete feed pipe connected to the casting site and communicated with the other end of the swing pipe 29; It is.

As shown in FIGS. 9 and 10, on the inner circumferential portion of the slide sleeve 40 on the cylinder 26 side, there is a surface parallel to a plane substantially perpendicular to the swinging direction (direction of arrows F and G) of the swinging tube 29. A pair of parallel inner surfaces 64, 64
is formed. On the other hand, a pair of parallel outer surfaces 65, 65 are formed on the outer circumferential portion of the end member 41, parallel to a plane substantially orthogonal to the swing direction of the swing tube 29. , are adapted to come into sliding contact with the parallel inner surfaces 64, 64.

Next, the operation of this invention will be explained.

First, the operation of pumping the fluid concrete A introduced into the hopper 22 will be explained. In the state shown in FIG. 4, fluid concrete A in the hopper 22 is sucked in from the open end 24 by driving one cylinder 26 and retracting the piston 32, and then the driving means 30 is activated. This figure shows a state in which one end of the swing tube 29 is aligned with the open end 24 of the cylinder 26, whereby the cylinder 26 and the swing tube 29 are aligned with the end member 4.
1 and a slide sleeve 40. Next, when the cylinder 26 is driven again to move the piston 32 forward, the fluid concrete A sucked into the cylinder 26 is discharged into the swing pipe 29. On the other hand, the other cylinder 27 is driven to suck in the fluid concrete A in the hopper 22 while the one cylinder 26 is performing the above-described discharge operation. When the discharge operation by one cylinder 26 is completed, the swinging tube 29 is swung by driving the drive means 30 in the opposite direction to the above, and the one cylinder 26 is
6 is disconnected and communicated with the other cylinder 27, and then the fluidized concrete A in the cylinder 27 is discharged into the swing pipe 29 in the same manner as described above. By sequentially repeating this, the fluid concrete A in the hopper 22 is forced to be delivered to the pouring site via the swing pipe 29 and the feed pipe 61. While such a pressure feeding operation is being performed, the rotating shaft 47 is rotated by the driving means, and the blades 31, 31, . . . fixed to the rotating shaft 47 are rotated by the driving means.
... is rotated, and the swing shaft 28 is rotated, so that the blades 60, 60... fixed to the swing shaft 28 are rotated, and these blades 3
1, 31... and 60, 60......, the fluid concrete A in the hopper 22 is stirred and at the same time the open ends 2 of the cylinders 26, 27 are stirred.
It is pressed toward the 4, 25 side.

Next, slide sleeve 40 and end member 41
The effect of this will be explained. The state shown by the solid line in FIG. 7 shows a state in which the end member 41 is not yet worn, but the swing tube 29 as described above is
As a result of the rocking, the end member 41 is worn down, as shown by the two-dot chain line in FIG. However, the internal pressure of the fluid concrete A generated by the discharge from the cylinders 26 and 27 causes the slide sleeve 40 to
(indicated by arrow E in the figure), the slide sleeve 40 is pushed toward the cylinder 26 or 27 by the internal pressure. On the other hand, since the end member 41 is swingably supported by the slide sleeve 40,
This end member 41 is also connected to the cylinder 26 or 2.
7, the upper part of the slide sleeve 40 comes into contact with the cylinder 26 or 27, but as the slide sleeve 40 further moves, the end member 41 swings, and its wear surface and the opening of the cylinder 26 or 27 come into contact with each other. The ends 24 and 25 are parallel to each other as shown by solid lines in FIG. Note that the two-dot chain line in FIG. 8 indicates a worn portion of the end member 41. In this way, the gap caused by the end member 41 that wears unevenly is automatically corrected.

Note that the end member 41 has parallel outer surfaces 65, 65
are in sliding contact with the parallel inner surfaces 64, 64 of the slide sleeve 40, so when the swing tube 29 swings, the end member 41 shifts in the swing direction, causing contact with the open end surface of the cylinder and the inner wall of the hopper. There is no chance of gravel or other particles getting caught in between.

Next, other embodiments shown in FIGS. 11 to 14 will be described. In addition, in the drawings, members similar to those in the above-described embodiment are denoted by the same reference numerals, and detailed explanations thereof are omitted.

In FIGS. 11 and 12, reference numeral 66
9 shows a slide sleeve slidably attached to one end of the swing tube 29, and the outer periphery thereof has the parallel inner surfaces 64, 64 described in FIGS. 9 and 10.
Pressing portions 67, 67 forming the two are formed to face each other. One end of the holding portions 67, 67 is integral with the slide sleeve 66, and is separated by slots 68, 68 from at least the portion where the parallel inner surfaces 64, 64 are formed to the other end. At the same time, the other ends and the parallel inner surfaces 64, 64 are moved toward the axis by bolts 69, 69.

With the above configuration, by appropriately rotating the bolts 69, 69, the holding parts 67, 67 are swung, and the degree of sliding contact between the parallel inner surfaces 64, 64 and the parallel outer surfaces 65, 65 can be adjusted. Ru.

Next, the embodiment shown in FIGS. 13 and 14 will be described. Reference numerals 70 and 71 in the figure indicate carbide chips fixed to the side surface of the end member 72 on the cylinder (not shown) side.

This configuration is designed to prevent wear of the end member 72 as much as possible due to the swinging of the swing tube 29.

As described above, the present invention provides a slide sleeve in which the spherical recess formed in the inner peripheral portion of the tip is provided with a pair of parallel inner surfaces that are parallel to a plane substantially perpendicular to the swinging direction of the swinging tube. The side surface faces parallel to one end surface of the rocking tube, and a gap perpendicular to the axis of the rocking tube is formed between the one end surface of the rocking tube and the one end of the rocking tube extends in the direction toward the cylinder. An end member is slidably mounted and has a pair of parallel outer surfaces on a spherical convex portion formed on the outer periphery, and the parallel outer surfaces are brought into sliding contact with the parallel inner surface of the slide sleeve, and the spherical convex portion is fitted into the spherical recess of the slide sleeve and swingably supported on the cylinder side of the slide sleeve, and when fluid concrete is pumped by the cylinder, the slide sleeve moves toward the cylinder due to the internal pressure. The structure is such that the end member is pressed against the open end of the cylinder, and the end member swings relative to the slide sleeve to properly press against the open end of the cylinder, so even if uneven wear occurs on the end member, This can be automatically corrected to efficiently pump fluid concrete.

In addition, the end member has its parallel outer surface in sliding contact with the parallel inner surface of the slide sleeve, and when the swinging tube swings, the end member shifts in the swinging direction, causing the opening end face of the cylinder and the inner wall of the hopper to slide. This has the effect of ensuring smooth operation without gravel or the like getting caught between the two.

[Brief explanation of the drawing]

In the drawings, FIGS. 1 to 3 show conventional devices,
Fig. 1 is an explanatory diagram of the operation, Figs. 2 and 3 are enlarged sectional views of main parts, Figs. A side view, FIG. 5 is a sectional view taken along the - line in FIG. 4, FIG. 6 is a sectional view taken along the - line in FIG. FIGS. 9 and 10 are longitudinal sectional views of the main parts taken along a plane perpendicular to the direction of movement, FIGS. 9 and 10 are cross-sectional views of the main parts taken along the plane of the swinging direction of the swing tube, and FIG. 11 is another embodiment FIG. 12 is a partially cutaway side view of FIG. 11, and FIGS. 13 and 14 are longitudinal cross-sectional views of essential parts showing other embodiments. 21... Concrete pump, 22... Hopper, 24... Open end, 25... Open end, 26
... Cylinder, 27 ... Cylinder, 29 ... Swing tube, 40 ... Slide sleeve, 41 ... End member, 42 ... Convex part, 43 ... Concave part, 44 ... End surface, 45 ... Gap, 46 ...Inner surface, 61...Feeding pipe, 64...Parallel surface, 65...Parallel surface, 66...
...Slide sleeve, 70...Carbide tip, 71
... Carbide tip, 72 ... End member.

Claims (1)

[Claims] 1. A hopper into which concrete is poured, a pair of cylinders whose openings communicate with the hopper,
One end is swung in a plane parallel to the opening of the cylinder so as to be able to communicate alternately with one of the pair of cylinders, and the other end is a feed pipe for feeding concrete. A swinging tube that communicates with A gap is formed perpendicular to the axis of the rocking tube between the tube and one end surface of the rocking tube, so that one end of the rocking tube can slide in the direction toward the cylinder. A slide sleeve is attached to the slide sleeve, and a spherical convex portion formed on the outer periphery has a pair of parallel outer surfaces, and the parallel outer surface is brought into sliding contact with the parallel inner surface of the slide sleeve, and the spherical convex portion is attached to the slide sleeve. and an end member fitted into a spherical recess and swingably supported on the cylinder side of the slide sleeve.