JPH0324593B2 - - Google Patents

Description

Detailed Description of the Invention Purpose of the Invention (Field of Industrial Application) This invention presses an elastic tube disposed in an arc shape in a pump case with an elastic roller that revolves while idly rotating. This invention relates to a squeeze pump that continuously transfers slurry inside the pump.

(Prior art) Conventionally, the squeeze pump has the following characteristics as shown in Fig. 9.
An elastic tube 2 is bent into an arc shape along the inner peripheral surface of the pump case 1, and a plurality of pressure rollers 5 are attached to the tip of a rotary arm 4 fixed to the rotary shaft 3. When the rotary arm 4 is rotated in the direction of the arrow in the figure, each pressure roller 5 rolls while pressing the elastic tube 2 against the inner peripheral surface of the pump case 1, and the elastic tube 2 is It was configured to transfer the slurry in tube 2.

However, in this squeeze pump, since the elastic tube 2 is pressed against the inner peripheral surface of the pump case 1 by the pressing roller 5,
When the elastic tube 2 is bent and installed inside the pump case 1 along an arcuate surface, the cross section of the elastic tube 2 becomes a horizontally elongated ellipse, and the elastic tube 2 is further flattened by the pressing roller 5. Pressed in the direction of crushing. For this reason,
The elastic tube 2 merely restores its elliptical cross-sectional shape even after passing through the pressure roller 5, and as it is repeatedly used, its cross-sectional shape permanently deforms to an elliptical shape.
The disadvantage was that the amount of slurry transferred was small.

In addition, as shown in FIGS. 10a to 10d, the elastic tube 2 is compressed between the pressure roller 5 and the inner peripheral surface of the pump case 1 to gradually deform the elastic tube 2 into a flat shape. The slurry in the elastic tube 2 is transferred by using the elastic tube 2. Therefore, the 10th
As shown in FIG. d, when the elastic tube 2 is completely compressed by the pressing roller 5, there is no place for the aggregate S contained in the slurry to escape. For this reason, the aggregate S of the slurry easily bites into the inner wall of the elastic tube 2, and the larger the aggregate S, the higher the probability of this happening.
The inner wall of the elastic tube 2 was easily damaged.

Furthermore, in a squeeze pump configured to press the elastic tube 2 against the inner peripheral surface of the pump case 1, the elastic tube 2 is pressed against the inner peripheral surface and is slightly stretched, and is strongly rubbed and generates heat. This has the disadvantage that the elastic tube 2 may wear out prematurely.

In order to overcome these shortcomings, the applicant's international application published under the Patent Cooperation Treaty
W082/02075 (International application number PCT/JP81/
00364) discloses a squeeze pump as shown in FIG. In this squeeze pump, a plurality of pairs of pressing rollers 5 are attached to a rotating shaft 3 of a pump case 1 via a support shaft 6, and each pair of pressing rollers 5 squeezes an elastic tube 2 from both sides, thereby causing the rotation By moving the pressing roller 5 on the elastic tube 2 as the shaft 3 rotates, the slurry inside the elastic tube 2 can be continuously transferred. In this squeeze pump, the pair of pressure rollers 5 press the elastic tube 2 from the sides, so the pressure rollers 5 always press the elastic tube 2, which has naturally collapsed into a horizontally long oval shape inside the pump case 1. The elastic tube 2 can be restored to a circular shape, thereby preventing the elastic tube 2 from being permanently deformed into an elliptical shape and ensuring a sufficient amount of slurry to be transferred.

Further, the elastic tube 2 is not stretched or rubbed by being pressed against the inner circumferential surface of the pump case 1, and the durability of the elastic tube 2 can be improved.

However, in this squeeze pump, the pressure roller 5
Since it is formed in a cylindrical shape with the same thickness from the tip to the base, there are the following problems.

That is, as shown in FIG. 12, when the elastic tube 2 is pinched and closed from both sides by the pressure rollers 5, the center part A of the elastic tube 2 is stretched by the pressure applied to both sides and becomes narrow. However, stress due to bending is generated at both the upper and lower ends B, and the width is deformed. Therefore, when the elastic tube 2 is compressed, there is a difference in thickness between the upper and lower ends B and the central part A, with the central part A having a thickness a and the both ends B having a larger thickness b.

However, as described above, since the tube pressing surfaces P of both pressing rollers 5 are cylindrical with the same diameter from the tip to the proximal end, when the pressing rollers 5 pinch and deform the elastic tube 5, the elastic tube Both upper and lower end portions B of 5 are closely pressed by the pressing roller 5, but a gap of (ba)/2 is created between the center portion A and both side surfaces of the pressing roller 5, respectively. Therefore, the press roller 5 does not hold the center part A of the elastic tube 5 loosely, and the slurry sent to the discharge side may forcefully pass through the center part A to the suction side even when the slurry is squeezed. Since this slurry contains large aggregates S, it may damage the inner wall of the central portion A of the elastic tube 5.

(Problems to be Solved by the Invention) As described above, with this invention, the cross section becomes permanently deformed into an elliptical shape as it is used, the amount of slurry transferred decreases, the elastic tube wears out early, and the pressure roller When squeezed, the inner wall of the elastic tube may be damaged, and furthermore, when pressed, a gap is created between the center of the elastic tube and both sides of the pressure roller, making it difficult to press the center of the elastic tube. This is an attempt to solve all of the problems that occur at once.

(Structure of the invention) (Means for solving the problems) In order to solve the above problems, this invention
An elastic tube 15 arranged in an arc shape so as to be inscribed in the pump case 11 is attached to the pump case 1.
The squeeze pump is designed to continuously feed the slurry in the elastic tube 15 by squeezing it with a plurality of pairs of pressure rollers 25 that freely rotate while revolving around a rotating shaft 22 located at the center of the elastic tube 1. In the above, the pressing roller 25 has an axis in a direction orthogonal to the rotating shaft 22 for revolution, has a substantially cylindrical shape with a slightly thicker central portion in the longitudinal direction, and has an arcuately chamfered edge at the top end thereof. The formed pinching start part 25a, the first pressing part 25b that expands in an arc shape from the pinching starting part 25a to the center of the circumference, the opening prevention part 25c on the circumference that expands the most, and the opening prevention part 25c from the opening prevention part 25c. The second holding part 25d has an arcuate shape that gently converges toward the base end.

(Function) By adopting the above-described means, the elastic tube 15 is deformed to correspond to the shape of the pressing rollers 25 when the elastic tube 15 is sandwiched between the pair of pressing rollers 25. It is.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 8.

As shown in FIG. 1, reference numeral 11 is a pump case having a substantially semi-cylindrical shape, and is fixed on a base 13 having wheels 12. As shown in FIG. As shown in FIG. 2, reference numeral 14 is a pressing protrusion fixed to the center in the left-right direction of the arcuate inner peripheral surface of the pump case 11, and an elastic tube 15 is bent in an arcuate shape inside the pressing protrusion. It is set up. As shown in FIG. 1, both ends of the elastic tube 15 extend forward in a straight line, one end of which is supported by a support 16 fixed to the upper end of the outer surface of the pump case 11, and the other end of the elastic tube 15 extending forward. It is supported by another support 17 fixed on the base 13.

22 is the pump case 11 as shown in FIG.
It is a rotating shaft that spans between both side plates of the rotary shaft, and a sprocket 23 is attached to one end of the rotating shaft. 24
are a pair of upper and lower support shafts protruding from the rotating shaft 22 in a direction perpendicular to the rotating shaft 22;
correspond to each other in the direction of rotation, and the rotation axis 2
2 and extend in opposite directions. Moreover, each pair of support shafts 24 are spaced apart from each other.

Reference numeral 25 denotes a pressure roller made of a sturdy synthetic resin material, metal material, etc., which is rotatably attached to the tip of each support shaft 24, and has a cylindrical shape with a slightly larger diameter at the center in the length direction. There is. In addition, the same pressing roller 25
rotates around the rotating shaft 22 and at the same time rolls on the outer surface of the elastic tube 15 while pinching the elastic tube 15 from both ends. Referring to FIG. 4, this pressing roller 25 will be described in detail.A first pressing portion 25b bulges in an arc shape and extends from a nipping start portion 25a formed by chamfering the circumferential edge of the top end into an arc shape toward the center of the circumferential surface. Furthermore, a second pressing portion 25d extends from the opening preventing portion 25c formed to swell the most at the center of the circumferential surface toward the base end while converging gently.

As shown in FIG. 3, 27 is a pair of support shafts fixed on the rotating shaft 22 at a position 90° apart from each pair of support shafts 24, and 28 is a shaft that freely rotates between the pair of support shafts 27. A pair of restoring rollers are supported. Both restoring rollers 28 press the elastic tube 15, which has been deformed into a flat shape in the longitudinal direction by the pressing roller 25, from the inside to restore it to a cylindrical shape, and the elastic tube 15 is moved toward the center of the pump case 11. There are now restrictions on movement to.

As shown in FIG. 1, reference numeral 29 is a motor support plate whose lower end is attached to a shaft 30 on the lower back surface of the pump case 11, and is capable of tilting in the front-rear direction about the same shaft 30 attachment portion. Reference numeral 31 denotes a bolt whose base end is attached to a shaft 32 so as to be tiltable up and down at the upper rear surface of the pump case 11, and its tip passes through the upper end of the motor support plate 29. Numeral 33 is a nut screwed onto the bolt 31, which is attached to the motor support plate 2.
It is in contact with the front of 9.

34 is a motor fixed to the rear surface of the motor support plate 29, and a chain 3 is connected between the sprocket 35 and the sprocket 23 on the rotating shaft 22.
Multiplying by 6.

Therefore, the motor 34 is restricted from tilting rearward about the mounting portion of the shaft 30 by the chain 36, and by the nut 33 from forward tilting.

In the squeeze pump described above, when the rotary shaft 22 is rotated by the motor 34 in the direction of the arrow shown in FIG. a
As shown in FIG. 2, it comes into contact with the upper left and right sides of the elastic tube 15 and begins to roll. Thereafter, as shown in FIGS. 5 and 6 b to f, the pressing roller 25 intersects with the elastic tube 15 and gradually presses it while forming an escape area for the aggregate of the slurry in the elastic tube 15. go. That is, the pinching start portion 25a of the preceding pair of pressure rollers 25 is connected to the elastic tube 15.
(FIG. 5a, FIG. 6a), and while intersecting the elastic tube 15, press it to the pinching starting portion 25a.
and the first holding part 25b [fifth
Figure b]. At this stage, as shown in FIG. 6b, a small portion of the inner wall surfaces of the elastic tubes 15 are pressed together to form a closed portion T. The closing portion T increases as shown in b to f in FIGS. 5 and 6, and when both pressing rollers 25 reach the vertical position shown in FIG.
When the second holding part 25d completely pinches the elastic tube 15, the formation of the closing part T is completed as shown in FIG. 6f. In this way, the elastic tube 15
As the degree of intersection with the pressing roller 25 deepens, it becomes accustomed to the pressing roller 25, and is eventually completely pressed.

As is clear from FIG. 6b, the closing angle β of the cross section of the elastic tube 15 when the pressing roller 25 starts closing the elastic tube 15 is very large, and the closing portion T gradually becomes larger. The aggregate S of the slurry can escape into the non-closed part O. Furthermore, as the degree of intersection between the pressing roller 25 and the elastic tube 15 increases, the non-closing portion O in the elastic tube 15 gradually becomes smaller, as shown in FIG. 6b, as shown in FIG. As shown in FIG. 8, the elastic tube 15 is completely closed, but the aggregate S of the slurry can escape to either the front or back of the closed part T in FIG. There is almost no chance that it will penetrate.

To explain in more detail with reference to FIG. 8, the elastic tube 15 is pressed against a pair of pressing rollers 25 from both sides
Since the aggregate S is compressed by the aggregate, the penetration angle α becomes large when viewed in cross section, and even when the elastic tube 15 is completely closed, the aggregate S cannot escape to the unclosed part of either the front or the rear. Therefore, the slurry is transported without being bitten by the closing portion T.

Slurry is continuously fed out in the rotational direction of the pressure roller 25. In addition, since the elastic tube 15 is bent along the circular inner peripheral surface of the pump case 1, it naturally tends to become flat in the radial direction of the pump case 1. The cross-sectional shape of the elastic tube 15 is forcibly restored to a circular shape.

Further, when the elastic tube 15 is pressed by the pressing rollers 25, the central portion of the elastic tube 15 is stretched by the pressure applied to both sides, but stress against bending is generated at both the upper and lower ends. Therefore, the elastic tube 15 is deformed into a narrower width by being depressed toward the center of both sides toward each other, but the upper and lower ends are deformed into a wider state due to the stress caused by bending.
Both sides of the elastic tube 15 have a shape corresponding to the circumferential shape of the pressing roller 25. Therefore, as shown in FIG. 2, when the elastic tube 15 is closed, both upper and lower ends thereof are held by the first holding part 25b and second holding part 25d of the pressing roller 25, and the center part is held by the opening prevention part 25c. I feel pressured. Therefore, the side surface of the elastic tube 15 and the pressure roller 2
There is no gap between the elastic tube 15 and the pressing surface of the elastic tube 15, and the elastic tube 15 is reliably closed by the pressing roller 25, and the slurry sent from the rear does not pass through this closed portion.

Effects of the Invention As described in detail above, according to the configuration of the present invention, the cross section of the elastic tube does not deform into an elliptical shape over a long period of use, and sufficient slurry transfer force can be maintained, and the pressing roller has an elastic Since the elastic tube is gradually compressed while creating an escape area for the slurry aggregate within the tube, the slurry aggregate will not dig into the inner wall of the elastic tube even when the tube is completely closed due to the same compression pressure. This prevents damage to the inner wall of the elastic tube.Furthermore, as the degree of intersection with the pressure roller deepens, both sides of the elastic tube that is pinched become shaped to correspond to the peripheral surface of the pressure roller, so that the sides of the elastic tube are Since there is no gap between the surface and the pressing surface of the pressing roller, an excellent effect is achieved in that the slurry sent out to the discharge side during clamping can be prevented from flowing back to the suction side again.

[Brief explanation of the drawing]

FIG. 1 is a front view embodying the squeeze pump of the present invention, FIG. 2 is an enlarged side sectional view of its main parts,
Fig. 3 is a front cross-sectional view showing the state in which the elastic tube is completely pressed by the pressing roller, Fig. 4 is an enlarged front view showing the pressing roller, Figs. 5 a to f, and Figs. 6 a to 6.
f is a front cross-sectional view and a side cross-sectional view showing the state in which the pressing roller gradually pinches the elastic tube, respectively, and FIG. 7 shows the state in which the size of the non-closed part in the elastic tube changes. Explanatory drawings, FIG. 8 is a plan sectional view showing the compressed state of the elastic tube, FIG. 9 is a front sectional view showing a conventional squeeze pump, and FIGS. 10 a to d are the compressed state of the elastic tube in this squeeze pump. 11 and 1.
FIG. 2 is a side sectional view showing another conventional example. Pump case...11, elastic tube...1
5. Rotating shaft...22, Support shaft...24, Pressing roller...25, Nipping start part...25a, First holding part...25b, Opening prevention part...25c, Second holding part...25d .

Claims (1)

[Scope of Claims] 1. A plurality of elastic tubes 15 arranged in an arc shape so as to be inscribed in the pump case 11 are freely rotated while revolving around a rotating shaft 22 located at the center of the pump case 11. Pair of pressure rollers 25
In the squeeze pump, the slurry in the elastic tube 15 is compressed by the elastic tube 15 and is continuously fed.
The pinching start part 25 is formed by having a substantially cylindrical shape whose axis is perpendicular to the axis, and which is slightly thicker at the center in the longitudinal direction, and by chamfering the circumferential edge of the top end into an arc shape.
a, a first pressing part 25b that expands in an arc shape from the pinching start part 25a to the center of the peripheral surface, an opening prevention part 25c on the peripheral surface that expands the most, and the opening prevention part 25c.
A second circular arc that gently converges from the base to the proximal end.
A squeeze pump characterized by comprising a holding part 25d.