JPH0436274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of a squeeze pump for continuously transporting slurry such as fresh concrete mixed with aggregate.

(Prior Art) Various squeeze pumps for transferring this type of slurry, etc., have been known in the past, but among them is the fifth type.
There is a squeeze pump with a structure as shown in Figure 8.

That is, as shown in FIG. 5, in this squeeze pump 50, a casing 52 shaped like a cylindrical container cut in half is fixed on a base 51. A rotating shaft 53 is provided in the center of the casing 52 so as to be relatively rotatable.
is a motor 55 provided outside the casing 52
and is adapted to rotate by a power transmission mechanism.

As shown in FIGS. 6 and 7, a portion of an elastic tube 54 is disposed on the inner periphery of the casing 52 so as to form an arc centered on the rotating shaft 53. As shown in FIGS.

A total of four roller shafts 56 are attached, two roller shafts 56 extending side by side in a radial direction 180 degrees opposite from the rotation shaft 53, and a narrow pressure roller 57 is rotatably provided at the tip of each roller shaft 56. Since the narrow pressure roller 57 rolls while compressing the elastic tube 54, the slurry in the elastic tube 54 is transferred in the rolling direction of the narrow pressure roller 57.

As shown in FIG. 8, in the elastic tube 54, a trough having a substantially V-shaped vertical section is formed in front of the narrow pressure roller 57 rolling, and the angle of the trough, that is, the slurry penetration angle is α is quite large, for example, as shown in FIG.
The slurry penetration angle β is larger than that of other squeeze pumps in which one narrow-pressure roller 57 is pressed against 4.

Therefore, in the squeeze pump 50 having the structure shown in FIGS. 5 to 8, the aggregate S in the slurry 58 is easily pushed to the front of the narrow pressure roller 57, and is less likely to be caught between the elastic tubes 54. Therefore, the squeeze pump 50 having the structure shown in FIGS.
It can be said that this is a squeeze pump with considerably higher transfer efficiency than the previous squeeze pump shown in Fig. 9.

(Problems to be Solved by the Invention) However, when the squeeze pump 50 having the above structure is used for a long time, a phenomenon is observed in which heat is generated at the portion where the elastic tube 54 contacts the narrow pressure roller 57.

In the squeeze pump 50, the cylindrical narrow pressure roller 57 rolls on the arc-shaped elastic tube 54 while compressing it, so the main cause of the heat generation phenomenon is the difference between the narrow pressure roller 57 and the elastic tube. This is thought to be due to the frictional heat caused by the slip between the parts.

This is because the cylindrical narrow pressure roller 57
A portion 54a near the rotation axis (not shown) shown in FIG.
The elastic tube 54 has the same circumferential speed in both the far portion 54b and the intermediate portion 54c.
This is because the narrow pressure roller 57 will slip against the elastic tube 54 at any part of its length.

When the elastic tube 54 generates heat in this way, there is a problem in that the rubber and reinforcing threads constituting it deteriorate and the life of the elastic tube 54 itself is shortened.

Therefore, in order to solve the above problem, for example,
The narrow pressure roller 57 increases as it moves away from the rotating shaft 53.
It is conceivable to use a tapered roller whose radius is gradually increased, but if a narrow pressure roller with such a structure is used, the roller shafts 56 arranged in pairs would have to be attached to the rotating shaft 53 non-parallelly. There is a problem that processing becomes difficult.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a squeeze pump having a structure that can suppress heat generation of an elastic tube without complicating the structure of the roller shaft of the narrow pressure roller.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention divides the narrow pressure roller of the squeeze pump having the above structure into slices, and each roller formed by the division is divided into rings. We adopted a method of creating a structure that allows each to rotate independently.

(Function) The pair of narrow pressure rollers compress and crush the elastic tube bent into an arc shape, and the crushed portion of the elastic tube moves as the narrow pressure roller 57 rolls. The slurry in the elastic tube is pushed by the collapsed portion of the elastic tube and moves.

The narrow pressure roller is divided into slices, and each roller formed by the division can rotate independently, so as the narrow pressure roller rolls, each roller has a different circumferential surface. Rolling at speed. Therefore, the narrow pressure roller is less likely to slip on the surface of the elastic tube, and less frictional heat is generated.

(Example) An example embodying the present invention will be described based on FIGS. 1 to 4.

As shown in FIG. 1, the squeeze pump 15 of this embodiment is mounted on an automobile 16.

The squeeze pump 15 is driven by a drive source 20 installed above it, and transfers slurry such as concrete to a high place through a transfer pipe 19.

The concrete slurry is put into the hopper 17, and in order to move the concrete slurry to a higher location, the transfer pipe 19 is extended by the extension of the boom 21 mounted on the automobile 16.

As shown in FIGS. 2 and 3, the squeeze pump 15 has a cylindrical casing 1 with a bottom and a lid.
is provided horizontally, and a rotating shaft 3 is vertically attached to the central portion of the rotating shaft by a bearing 2. Two arms 4 having a rectangular cross section are welded and fixed to the center of the rotating shaft 3 at their base ends at 180 degrees opposite positions, and their other ends extend outward in the radial direction.

Roller shafts 5 are fixed to the upper and lower surfaces of the tip end of the arm 4 by bolts 6, and a synthetic resin narrow pressure roller 7 is rotatably attached to the roller shafts 5.

As shown in FIG. 4, the narrow pressure roller 7 has an almost cylindrical shape as a whole, but the center portion in the length direction is slightly swollen. This is because when the narrow pressure roller 7 narrows the elastic tube, which will be described later, the both sides of the narrowed tube do not collapse as much as the central part due to the resistance of the elastic tube, but take on a swollen shape. This is to match the surface shape of the elastic tube.

Further, the narrow pressure roller 7 is divided into three parts by being sliced at two places, and the three rollers are sequentially divided from the base end side to the distal end side of the roller shaft 5. 7a, middle roller 7b,
An outer roller 7c is formed.

Then, the inner roller 7a and the outer roller 7c
Each roller axis is larger than the roller width of the middle roller 7b.

The inner roller 7a is supported by the roller shaft 5 via two bearings 8a, the middle roller 7b via a bearing 8b, and the outer roller 7c via a bearing 8c so as to be able to rotate independently. A stepped portion 5a is provided on the base end side of the roller shaft 5, and a female thread 9 is screwed into the tip end. Therefore, each of the rollers 7a, 7b, and 7c is designed to rotate with almost no horizontal shaking.

As shown in FIGS. 2 and 3, a support member 10 having an approximately pentagonal plane is horizontally fixed to the rotation shaft 3 and the arm 4 at the center of the rotation shaft 3. The planar shape is approximately hexagonal. Further, on the six corners 10a of the support member 10, restoring rollers 11 of elastic tubes, which will be described later, are longitudinally pivoted.

Further, a pair of upper and lower guide rollers 12 are rotatably attached at four locations in the supporting member 10 between two adjacent restoration rollers 11 where the narrow pressure roller 7 is not provided. There is.

Further, an arcuate guardrail 13 is fixed to the inner peripheral side of the central portion of the side portion of the casing 1, and one elastic tube 14 is arranged in an arcuate shape inside the guardrail 13.

Further, the elastic tube 14 is supported with its upper and lower surfaces being compressed by a pair of upper and lower narrow pressure rollers 7, and is also supported vertically by a pair of guide rollers 12 in a partially pressed state. ing.

Furthermore, the inner peripheral side of the elastic tube 14 is regulated in position by the restoring roller 11 so that it does not move toward the rotating shaft 3 side. Further, a position regulating member 22 for regulating the position of the elastic tube 14 is provided on the inner circumferential side of the straight portion of the inner surface of the casing 1 where the elastic tube 14 is straight.

The narrow pressure roller 7 described above is assembled to the tip of the roller shaft 5 in the following manner.

First, the bearing 8a is inserted into the base end side of the roller shaft 5, the inner roller 7a is assembled to the roller shaft 5, and another bearing 8a is inserted into the same roller shaft 5. Next, a bearing 8b having an inner diameter smaller than the bearing 8a is inserted, and the middle roller 7b is fitted onto the bearing 8b.

Further, a bearing 8c is inserted in front of the middle roller 7b, the inner roller 7a is assembled to the roller shaft 5, and another bearing 8c is inserted into the same roller shaft 5. Finally, the narrow pressure roller 7 is assembled to the roller shaft 5 by screwing the female thread 9 onto the tip of the roller shaft 5.

Next, the functions and effects of the squeeze pump configured as described above will be described.

When the drive source 20 is started and the rotating shaft 3 of the squeeze pump 15 is rotated in the direction indicated by arrow A in FIG. The roller shaft 5 and support member 10 rotate. Then, the third
As shown in the figure, the narrow pressure roller 7 has an elastic tube 14
It rolls while contacting the upper and lower outer surfaces of the elastic tube 14.

In this way, the slurry mixer 2 mixes aggregate into the mortar while the elastic tube 14 is being rolled while the narrow pressure roller 7 is compressing the elastic tube 14.
0 to one end opening of the elastic tube 14, which is the inlet of the squeeze pump 15, and flowed in the direction of arrow B in FIG. be done.

Furthermore, since the narrow pressure roller 7 rolls in contact with the elastic tube 14, the crushed portion of the elastic tube 14 moves as the narrow pressure roller 7 rolls.

Therefore, the slurry between the two pairs of narrow pressure rollers 7 in the elastic tube 14 is pushed forward and transported in the direction of arrow C.

By the way, the narrow pressure roller 7 is divided into three parts, each of which has a smaller roller width: an inner roller 7a, a middle roller 7b, and an outer roller 7c, and each roller 7a, 7b, and 7c rotates independently. As the narrow pressure roller 7 rolls, each of the rollers 7a, 7b, and 7c rolls at different circumferential speeds. For example, when comparing rollers with approximately the same diameter, the rotation It is also possible for the outer roller 7c located at the farthest position from the shaft 3 to rotate at a higher circumferential speed than the inner roller 7a located at the closest position.

In this way, when the narrow pressure roller 7 of this embodiment is used, the narrow pressure roller 7 and the elastic tube 1
4, the elastic tube generates less heat, and as a result, the life of the elastic tube 14 is dramatically extended, which is an excellent effect.

In the process of transferring the slurry, the restoring roller 11 functions to restore the collapsed portion of the elastic tube 14 and also functions to restrict the elastic tube 14 from moving toward the rotating shaft 3 side.

Further, the guide roller 12 partially deforms the elastic tube 14 before the elastic tube 14 is suddenly crushed by the narrow pressure roller 7, and gradually deforms the elastic tube 14.
4 is crushed. This action has the effect of reducing the fatigue of the elastic tube 14 and extending the life of the elastic tube 14, compared to a squeeze pump that does not have the guide roller 1.

The present invention is not limited to the embodiments described above, and can also be implemented in the following embodiments, for example.

(1) The squeeze pump 15 of the present invention can be installed on a movable base other than the automobile 16.

(2) The squeeze pump 15 of the present invention can also be of a vertical type.

(3) Since the arm 4 is simply for attaching the roller shaft 5 to the rotary shaft 3, it is possible to eliminate the arm 4 and directly attach the roller shaft 5 to the rotary shaft 3, or it is possible to provide two arms 4 and attach each to the rotary shaft 3. It is also possible to couple the roller shaft 5 to the roller shaft 5.

In short, if the roller shaft 5 on which the narrow pressure roller 7 for narrowing the arcuate elastic tube 14 can be attached directly or indirectly to the rotating shaft 3, the arm 4 and the roller shaft 5 are not necessary. The design can be changed as desired.

(4) Although the frictional heat between the narrow pressure roller 7 and the elastic tube 14 can be considerably suppressed by using the narrow pressure roller 7 having the structure according to the present invention, the frictional heat can be further suppressed due to the surface shape of the elastic tube 14. In order to suppress this or to increase transfer efficiency, the longitudinal cross-sectional shape of the narrow pressure roller 7 as a whole can be changed as long as the shape and structure of the roller shaft 5 are not complicated. In particular, if the center part is made to have a slightly swollen shape, the narrow pressure roller 7 will easily conform to the shape of the center part of the surface of the elastic tube 14 that has been narrowed.

(5) The method of mounting the narrow pressure roller 7 on the roller shaft 5 is to attach each roller 7a, 7b, and
If the structure is such that 7c rotates independently and does not fall off from the roller shaft 5,
It can be changed arbitrarily; for example, it is not necessary to provide the roller shaft 5 with the stepped portion 5a or the like.

(6) The material of the narrow pressure roller 7 can also be made of metal or the like.

Effects of the Invention As detailed above, the present invention has the excellent effect of preventing the generation of frictional heat by the narrow pressure roller on the surface of the elastic tube without complicating the structure of the roller shaft. This has the effect of extending tube life.

[Brief explanation of drawings]

Figures 1 to 5 are drawings according to the present invention, where Figure 1 is a schematic side view of a concrete pump truck in which the squeeze pump of the embodiment is installed, and Figure 2 is the arrangement of the narrow pressure roller and elastic tube in the casing. 3 is a side view of the arrangement, FIG. 4 is a partially longitudinal side view of the narrow pressure roller, FIGS. 5 to 10 are drawings related to the prior art, and FIG. 5 is a side view of the prior art. , Fig. 6 is a plan view of the arrangement of the elastic tube and the narrow pressure roller in the casing, Fig. 7 is a side view of the arrangement, and Fig. 8 is a longitudinal sectional view of the elastic tube compressed by two narrow pressure rollers. Figure 9 is a vertical cross-sectional view of an elastic tube compressed by one compression roller;
The figure is a side view of the narrow pressure roller on the elastic tube. Rotating shaft 3, roller shaft 5, narrow pressure roller 7, rollers 7a, 7b, 7c, elastic tube 14.

Claims (1)

[Scope of Claims] 1. The elastic tube 14 is bent into an arc shape, and a roller shaft 5 is provided in a direction substantially perpendicular to the rotating shaft 3 provided at the center of the arc, and the roller shaft 5
In this squeeze pump, a squeeze roller 7 is provided for squeezing the elastic tube 14 from both sides. A squeeze pump characterized by a structure that allows it to rotate. 2. The squeeze pump according to claim 1, wherein the narrow pressure roller 7 has a swollen shape at its longitudinal center.