JP5117684B2 - Rubber roller for squeeze pump - Google Patents

Description

  The present invention is a squeeze pump that is equipped in a squeeze pump and discharges fluid such as ready-mixed concrete sucked from one end of the pumping tube from the other end by rolling in the tube central axis direction while pressing the pumping tube. The present invention relates to a rubber roller.

  In general, a squeeze pump has a cylindrical pump case with a curved pumping tube, and a rubber roller that presses the pumping tube from the inside of the curve rolls in the axial direction of the tube, so that the raw material sucked from one end of the pumping tube is used. A fluid such as concrete is discharged from the other end and pumped (for example, Patent Document 1).

  FIG. 8 shows the distribution of the seal surface pressure in the roller axial direction when a general pumping tube is pressed by various rollers. Here, the seal surface pressure is the contact pressure between the inner surfaces of the pumping tubes crushed by the pad and the roller disposed along the inner peripheral surface of the pump case. Higher fluid pressure can be sealed.

  As shown in FIG. 8, when the pumping tube is pressed with an iron roller that is extremely difficult to deform, the seal surface pressure at both ends in the roller axial direction increases, and the difference from the seal surface pressure at the center increases. This difference in seal surface pressure is improved to some extent by using a rubber roller, and further improved by reducing the seal surface pressure at both ends using a drum-shaped crown roller.

  For example, when a cylindrical rubber roller having a constant diameter is used, the distribution of the seal surface pressure changes in the order of the rubber roller A, the rubber roller B, and the rubber roller C due to wear of the inner rubber of the pumping tube. The seal surface pressure of the portion is less than 0.0 MPa, and the fluid cannot be sealed. In contrast, by using a spring-supported spring support roller, the clearance between the pad and the rubber roller is changed according to the wear of the pumping tube, and the distribution of the seal surface pressure is transferred from the spring support roller A to the spring support roller B. The amount of change in the seal surface pressure when doing so may be suppressed.

As described above, the distribution of the seal surface pressure is such that the difference between the maximum seal surface pressure and the minimum seal surface pressure is made as small as possible, and the necessary seal surface pressure can be obtained even considering the wear of the inner rubber of the pumping tube. In addition, it is set so as not to adversely affect the rubber and the reinforcing cord even in a portion where the seal surface pressure is increased.
JP 2000-154785 A

  By the way, for example, when the inner diameter is φ100 mm, the thickness of the pumping tube is set to about 16 mm to 18 mm. When the inner diameter is φ125 mm, the thickness is often set to about 16 mm to 20 mm. For the purpose of extending the life against wear, increasing the fluid suction force by improving the restoring performance against crushing, and stabilizing the seal surface pressure, it is required to set the wall thickness of the pumping tube to be thicker than before.

  However, as the thickness of the pumping tube increases, the difference between the maximum seal surface pressure and the minimum seal surface pressure tends to increase. The pressure needs to be extremely high, and the pumping tube, rubber roller, and pad may be damaged.

  For example, as shown in FIG. 9A, even when a cylindrical rubber roller 101 having a constant diameter is used, if the thickness of the pumping tube 102 to be pressed is thin, a nearly uniform distribution of the seal surface pressure can be obtained. However, if the thickness of the pumping tube 102 is 18 mm or more and 19% or more of the inner diameter, the central portion cannot be sealed without damaging both ends. 9 indicates the seal surface pressure of the pumping tube 102.

  Further, as shown in FIG. 9B, even if the thickness of the pumping tube 102 is 18 mm or more and 19% or more of the inner diameter, the drum-shaped crown roller 103 is within the normal thickness range. 9 can be used to obtain a seal surface pressure distribution that is almost uniform. However, as shown in FIG. 9C, when the thickness of the pumping tube 102 is 22 mm or more, the crown roller 103 is used. Can not seal the central part.

  The crown roller 103 which makes the distribution of the seal surface pressure of the pumping tube 102 with a wall thickness of about 20 mm substantially uniform has a difference between the diameter of the central part and the diameter of the end part of about 10 mm. It is conceivable to seal the central part by increasing the size. However, when an extreme crown roller 104 having a diameter difference exceeding 10 mm is used, both ends can be sealed as shown in FIG. Disappear. In addition, the arrow in FIG. 10 shows the sealing surface pressure of the pumping tube 102.

  The present invention reduces the difference between the maximum seal surface pressure and the minimum seal surface pressure when pressing a thick-walled pumping tube as much as possible, and can set the seal surface pressure in all parts within a suitable range. The purpose is to provide rubber rollers for pumps.

In order to achieve the above object, a rubber roller for a squeeze pump according to the present invention is provided in a squeeze pump, and presses a pumping tube that curves along the inner peripheral surface of the pump case from the inside of the tube while moving in the tube central axis direction. The fluid sucked from one end of the pumping tube is discharged from the other end. Both end portions in the roller axial direction are cylindrical portions having a constant diameter and a constant length, and the central portion in the roller axial direction is curved. As the bulging part that bulges, the cylindrical part and the outer peripheral part of the bulging part are made of rubber, the cylindrical part is positioned at both ends in the roller axial direction of the crushed pumping tube, and the bulging part is crushed. The pumping tube is positioned at the center in the roller axial direction.

  According to this configuration, both ends of the rubber roller are formed in a cylindrical shape having a constant diameter and a fixed length, and only the central part is bulged. Therefore, even if the pumping tube to be pressed is thick, the seals at both ends are sealed. The seal surface pressure at the central portion can be increased without reducing the surface pressure. Thereby, the difference between the maximum seal surface pressure and the minimum seal surface pressure can be made as small as possible, and the seal surface pressure at all the parts can be set within a suitable range.

  The bulging portion may be bulged into a curved surface by setting the radius of curvature in the roller axial direction according to the desired length and bulging height in the roller axial direction. Furthermore, the bulging portion can be swelled into a spherical shape by appropriately setting the length in the roller axis direction and the bulging height. In addition, the cylindrical portion and the bulging portion may be continuous by bending the surfaces thereof or may be smoothly continued via a curved surface.

  If the bulging height of the bulging part is set to 8 mm to 14 mm, the seal surface pressure when pressing the pumping tube having a thickness of about 22 mm to 30 mm can be set to a suitable range of about 1 MPa to 3 MPa, for example. it can. In particular, when the thickness of the pumping tube is about 22 mm, the bulging height is preferably set to 8 mm to 14 mm, and when the thickness of the pumping tube is about 30 mm, the bulging height is set to 10 mm to 14 mm. It is good. Here, the bulging height is the maximum height of the bulging portion relative to the cylindrical portion, and is the difference between the roller radius in the center of the bulging portion in the roller axial direction and the roller radius in the cylindrical portion.

  The rubber roller in which only the central portion is bulged can be formed by grinding the outer peripheral surface of a cylindrical rubber roller having a constant diameter, thereby making it possible to use a conventional facility for manufacturing a rubber roller as it is.

The present invention also provides a squeeze pump including a rubber roller in which both ends are cylindrical with a constant diameter and a fixed length, and only the center is bulged. That is, the present invention relates to a cylindrical pump case, a pumping tube that is curvedly mounted along the inner peripheral surface of the pump case, and the pumping tube is rotated in the tube central axis direction while pressing the pumping tube from the inside of the curve. A rubber roller that moves and discharges fluid sucked from one end of the pumping tube from the other end. The rubber roller has a cylindrical portion having a constant diameter and a constant length at both ends in the roller axial direction, and a center in the roller axial direction. The cylindrical portion and the outer peripheral portion of the bulging portion are made of rubber, and the cylindrical portion is positioned at both ends in the roller axial direction of the crushed pumping tube. The squeeze pump is characterized in that the bulging portion is located in the central portion in the roller axial direction of the crushed pumping tube.

  As the pumping tube, two layers of reinforcing cord layers formed by arranging reinforcing cords inclined with respect to the tube central axis direction in the circumferential direction are embedded, and the inclination direction of the reinforcing cords arranged in the two layers of reinforcing cord layers Are set so as to cross each other. It is particularly preferable that the squeeze pump equipped with such a pumping tube adopts the configuration of the present invention.

  In other words, the pumping tube tries to expand in the roller axial direction by being pressed by the rubber roller, but the reinforcing cord layer regulates the expansion, so that a compressive force in the roller axial direction acts on the pumping tube. This compressive force tries to expand the central portion in the roller axial direction of the crushed pumping tube, thereby opening a gap that disables sealing in the central portion in the roller axial direction. In addition, tension acts on the reinforcement cords that restrict the spread of rubber at both ends, but this reinforcement cord is inclined with respect to the roller axis direction as well as the tube center axis direction. Does not suppress the spread of the part.

  As described above, the pumping tube in which the reinforcing cord layer is embedded has a gap that makes it impossible to seal the central portion in the axial direction of the roller, but adopts the configuration of the present invention in which only the central portion of the rubber roller is bulged. Thus, the center portion can be sealed together with both end portions with a seal surface pressure within a suitable range.

  A squeeze type pump equipped with a pumping tube having an inner diameter of φ75 mm to φ200 mm, which is a range in which the inner diameter is normally used, and a wall thickness of 22 mm to 30 mm, which is thicker than the conventional one, adopts the configuration of the present invention, so Can be set to a suitable range of, for example, about 1 MPa to 3 MPa.

  If the inner diameter of the pumping tube is within a range of φ75 mm to φ200 mm, the size of the inner diameter hardly affects the distribution of the seal surface pressure, and the bulging height of the bulging portion is 8 mm to Φ depending on the wall thickness of the pumping tube. It is preferable to set appropriately within the range of 14 mm.

  As described above, according to the present invention, both ends of the squeeze-type pump rubber roller are formed in a cylindrical shape having a constant diameter and a constant length, and only the central part is bulged, so that the pumping tube to be pressed is thick. However, it is possible to sufficiently increase the seal surface pressure that is insufficient in the central portion in the roller axial direction without reducing the seal surface pressure at both ends in the roller axial direction. As a result, the difference between the maximum seal surface pressure and the minimum seal surface pressure of the thick-walled pumping tube can be made as small as possible, and the seal surface pressure at all the sites can be set within a suitable range.

  As a result, the thickness of the pumping tube can be increased to increase the life against wear of the inner rubber, increase the fluid suction force by improving the restoring performance against crushing, and stabilize the seal surface pressure.

  Hereinafter, the best mode for carrying out the squeeze pump rubber roller according to the present invention will be described with reference to the drawings. FIG. 1 is an overall sectional view of a squeeze pump provided with a rubber roller for a squeeze pump according to the present invention. FIG. 2 is a cross-sectional view of a rubber roller that presses the pumping tube. FIG. 3 is a sectional view of the pumping tube.

  The squeeze-type pump 1 is for pumping fluid such as ready-mixed concrete, and is provided with a cylindrical pump case 2 with both ends closed, and the pump case 2 is curved along the inner peripheral surface thereof. The pumping tube 3, the rubber roller 4 that rolls in the direction of the tube center axis while pressing the pumping tube 3 from the inside of the curve and discharges the fluid sucked from the lower end of the pumping tube 3 from the upper end, and the pump while holding the rubber roller 4 A roller 5 that rotates around the central axis of the case 2 to roll the rubber roller 4, and the roller shaft of the rubber roller 4 so as to increase the seal surface pressure at the central portion in the roller axial direction of the pumping tube 3 pressed by the rubber roller 4. The both ends in the direction are cylindrical portions 6a having a constant diameter and a fixed length, and the central portion in the roller axial direction of the rubber roller 4 bulges in a curved shape There is a 6b.

  The pumping tube 3 has a structure in which two layers of reinforcing cord layers 3c and 3d are embedded between an inner rubber 3a through which fluid flows and an outer rubber 3b covering the tube surface, and an inner diameter (d) thereof is φ75 mm. It is set to ~ φ200 mm, and the wall thickness (t) is set to 22 mm to 30 mm.

  The reinforcing cord layers 3c and 3d are formed by arranging reinforcing cords such as steel cords inclined with respect to the tube central axis direction in the circumferential direction, and the inclination directions of the reinforcing cords arranged in the reinforcing cord layers 3c and 3d intersect each other. It is set to be.

  The central portion in the tube central axis direction of the pumping tube 3 is curved with a constant curvature so as to be inscribed in a rubber pad 7 disposed on the inner peripheral surface of the pump case 2 and to change the direction by 180 °. Both ends in the tube central axis direction of the pumping tube 3 are formed in a straight tube shape, pass through a pair of upper and lower tube through holes 8 formed on the front side of the pump case 2, and extend from the inside of the pump case 2 to the outside. Has been.

  The rubber roller 4 is formed by lining a rubber 4c around a cored bar 4b through which the roller shaft 4a passes. For example, by grinding the outer peripheral surface of a cylindrical rubber roller having a constant diameter as a whole, cylindrical portions 6a are formed at both ends. Is formed, and a bulging portion 6b is formed at the center. The rubber roller 4 can also be formed by adhering the separate bulging portion 6b to the central portion of the cylindrical rubber roller using an adhesive or the like.

  The bulging height (H) of the bulging portion 6b is set to 8 mm to 14 mm, and the length (L1) in the roller axial direction of the bulging portion 6b is the width (B) of the pumping tube 3 in the crushed state. Is set to a length of about 2/5 to 4/5. Further, the length (L2) of the rubber roller 4 is longer than the length (L1) of the bulging portion 6b in the roller axial direction, and is set to a length similar to the width (B) of the crushed pumping tube 3. The

  The bulging portion 6b has a radius of curvature in the roller axial direction on the surface according to the length (L1) and the bulging height (H) in the roller axial direction, so that the bulging portion 6b is desired. Is set to a curved surface having a length (L1) in the roller axis direction and a bulging height (H). For example, the bulging portion 6b can be formed into a spherical shape by appropriately setting the length (L1) and the bulging height (H) in the roller axial direction. In addition, the cylindrical portion 6a and the bulging portion 6b have their surfaces bent continuously, but the surface pressure in the vicinity of the boundary can be changed smoothly by smoothly continuing through the curved surface. it can.

  The rotor 5 is a frame formed by assembling two rectangular plates in parallel, and both end portions of the rotor 5 support both ends of the roller shaft 4a, so that a total of two rubber rollers are provided at both end portions of the rotor 5. 4 is installed. The central part of the rotor 5 is connected to a rotary shaft 9 provided at the center inside the pump case 2 so as to be integrally rotatable. As the rotary shaft 9 rotates, the rubber rollers 4 at both ends of the rotor 5 are connected to the pads 7. The pumping tube 3 is sandwiched between the two and the tube is crushed and pressed in the direction of the center axis of the tube, and the fluid is pumped.

  The clearance (a) between the rubber roller 4 and the pad 7 can provide a seal surface pressure that can seal the pumping tube 3 even if a decrease in the seal surface pressure due to wear of the inner surface rubber 3a is taken into account, and the maximum seal. The surface pressure is set to a size that does not adversely affect the inner rubber 3a, the outer rubber 3b, and the reinforcing cord.

  Here, the operation of the squeeze pump 1 will be specifically described. First, the rotor 5 rotates clockwise in FIG. 1 so that the rubber roller 4 gradually starts pressing the pumping tube 3 until reaching the position corresponding to 6 o'clock of the timepiece, and then the position corresponding to 12:00 of the timepiece. The pressure of the pumping tube 3 is released gradually. During this time, the rubber roller 4 rolls while crushing the pumping tube 3, so that the fluid inside the pumping tube 3 is sent to the upper end, and the pumping tube 3 is restored after the rubber roller 4 passes through to restore the pumping tube 3. A new fluid is sucked from the lower end of the tube 3.

  Next, the relationship between the bulging height (H) of the bulging portion 6b and the seal surface pressure will be described. FIG. 4 shows the distribution of the seal surface pressure in the roller axial direction when a pumping tube having a wall thickness of 22 mm is pressed by a rubber roller having various bulging heights, and FIG. 5 shows various pumping tubes having a wall thickness of 30 mm. The distribution of the seal surface pressure in the roller axial direction when pressed by a rubber roller having a protruding height is shown. 4 and 5, the horizontal axis indicates the position in the roller axial direction, and the vertical axis indicates the seal surface pressure (MPa). The inner diameter (d) of the pumping tube 3 is set to φ100 mm, and the clearance (a) between the rubber roller 4 and the pad 7 is set so that the central seal surface pressure is 2 MPa, which is an appropriate value.

  The seal surface pressure is a contact pressure between the inner surfaces of the crushed pumping tubes 3, and an appropriate surface pressure is 1.0 MPa to 3.0 MPa, which is slightly higher than the fluid pressure. The dangerous surface pressure is a seal surface pressure exceeding 3.0 MPa, and may damage the pumping tube 3, the rubber roller 4, the pad 7, and the like. The reduced surface pressure is a seal surface pressure lower than 1.0 MPa, the seal is insufficient, and there is a risk of causing reverse flow at high pressure and early wear. The impossible surface pressure is a seal surface pressure lower than 0.0 MPa, and is a state in which there is a gap between the inner surfaces of the tubes, causing a back flow of fluid. Note that the range of the seal surface pressure can be appropriately changed according to the pressure of the fluid to be pumped, the strength of the rubber, and the like.

  As shown in FIG. 4, when the wall thickness (t) of the pumping tube 3 is 22 mm, the bulging height (H) of the rubber roller 4 is set in the range of 8 mm to 14 mm, so that the seal surface pressure is reduced in the entire region. It can be in the range of substantially appropriate surface pressure. Among them, when H = 12 mm is set, the seal surface pressure at the end portion where the cylindrical portion 6a is located can be brought closest to the seal surface pressure at the center portion where the bulging portion 6b is located. In the case where H = 8 mm is set, the seal surface pressure at the end is slightly large, and in the case where H = 14 mm is set, the seal surface pressure at the end is slightly small.

  In addition, as shown in FIG. 5, when the thickness (t) of the pumping tube 3 is 30 mm, the bulging height (H) of the rubber roller 4 is set in the range of 10 mm to 14 mm, so that the seal surface in the entire region. The pressure can be set within a range of substantially appropriate surface pressure. As described above, when the thickness (t) of the pumping tube 3 is increased, the bulging height (H) is preferably set slightly larger. In addition, when the inner diameter (d) of the pumping tube 3 is in the range of about φ75 mm to φ200 mm used for pumping ready-mixed concrete, the relationship between the wall thickness (t) and the bulging height (H) Less susceptible to the size of the inner diameter (d).

  Next, the rubber roller of the present invention is compared with other rubber rollers. FIG. 6 shows the distribution of the seal surface pressure in the roller axial direction when pumping tubes of various thicknesses are pressed by the present invention and a conventional rubber roller. In FIG. 6, the horizontal axis indicates the position in the roller axial direction, and the vertical axis indicates the seal surface pressure (MPa). The inner diameter (d) of the pumping tube 3 is set to φ100 mm, and the clearance (a) between the rubber roller 4 and the pad 7 is set so that the average seal surface pressure in all regions is about 2 MPa which is an appropriate value. Yes.

  As shown in FIG. 6, the one using a cylindrical roller having a constant diameter as a whole (A and B) tends to have a large seal surface pressure at the end and a small seal surface pressure at the center. In particular, when the thickness (t) of the pumping tube 3 is large (A), the seal surface pressure at the end becomes extremely large, and a gap is left in the center.

  On the other hand, when the wall thickness (t) is thin (D), those using the roller of the present invention (C and D) tend to have a large seal surface pressure at the central portion where the bulging portion 6b is located. Although it exists, the seal | sticker surface pressure of an edge part and a center part can be closely approached. In particular, when the thickness (t) of the pumping tube 3 is large (C), the roller of the present invention can be used more effectively.

  Those using extreme crown rollers (E and F) have a large seal surface pressure at the center and a small seal surface pressure at both ends, and therefore it is difficult to set the entire region to an appropriate surface pressure. In addition, in the case of using a normal crown roller in which the difference in diameter between the central portion and the end portion is 10 mm or less, even when the thick pumping tube 3 is pressed, the gap in the central portion can be closed. It cannot be sealed.

  Here, the behavior of the thick pumping tube 3 pressed by the normal crown roller 103 will be described. FIG. 7 is a view showing a state in which the pumping tube 3 is gradually pressed by a normal crown roller 103. Here, the arrow in FIG. 7 indicates the contact pressure between the pumping tube 3 and the crown roller 103.

  First, as shown in FIG. 7 (a), the pumping tube 3 whose center is pressed by the crown roller 103 and the pad 7 is deformed into an elliptical shape, and the pumping tube 3 is pushed as shown in FIG. 7 (b). It will be crushed.

  Both end portions of the pumping tube 3 have a thickness corresponding to twice the central portion, and the inner rubber 3a tends to spread in the roller axial direction when pressed by the crown roller 103 and the pad 7. Since the expansion of the inner surface rubber 3a is regulated by the reinforcing cord layers 3c and 3d, the inner portion of the inner surface rubber 3a is pushed out toward the center portion, and the center portion is pushed up to leave a gap 10 in the center portion of the pumping tube 3. . Since the reinforcing cords arranged in the reinforcing cord layers 3c and 3d are inclined with respect to the roller axial direction, the reinforcing cord acting on the tension prevents the central portion from being pushed up by restricting the spread of the inner rubber 3a. Never do.

  As the pumping tube 3 is pressed more strongly, the force to push up the central portion becomes stronger. Even if the pumping tube 3 is further pressed, the contact pressure between the pumping tube 3 and the crown roller 103 at each portion is extremely increased. As shown in (c), the gap 10 at the center of the pumping tube 3 remains vacant.

  According to the above configuration, the cylindrical portion 6a at both ends of the rubber roller 4 is formed into a cylindrical shape having a constant diameter and a constant length, and only the central portion as the bulging portion 6b is bulged, so that the pumping tube 3 to be pressed is thick. Even if it is, the seal surface pressure at both ends in the roller axial direction is not reduced from the appropriate surface pressure, but the seal surface pressure, which is insufficient in the central portion in the roller axial direction, is increased to the appropriate surface pressure, and the back flow of fluid Can be prevented.

  Since the inner rubber 3a can be thickened, it is possible to extend the life of the pumping tube 3 against the wear. Further, even if the amount of compression slightly changes due to wear or the like, the seal pressure is prevented from changing and the seal is suppressed. The surface pressure and the discharge pressure can be stabilized. Moreover, the thick pumping tube 3 has high restoration performance after being crushed and can increase the fluid suction force. Moreover, since a large-diameter reinforcing cord can be used, high-pressure pumping is possible.

In particular, when pumping fresh concrete, the pumping quantity and pumping time to reach the wear of the inner rubber 3a, a 2000m ³ ~4000m ³ about at pumping quantity, conventional pumping tube pumping time is about 50 hours to 100 hours Can be more or longer. The wear of the inner rubber 3a is proportional to the pumping pressure and the flow velocity, but since the pumping pressure can be increased, the viscosity that increases the pipe resistance can be increased, the strength of the concrete can be increased, and the casting can be performed for a short time. Make it possible.

  In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, the inner diameter (d) of the pumping tube 3 is not limited to φ75 mm to φ200 mm, and may be a pumping tube 3 having a diameter of φ75 mm or less or φ200 mm or more. In this case, the bulging height (H) of the rubber roller 4 may be appropriately set according to the inner diameter (d) and the wall thickness (t) of the pumping tube 3.

Overall sectional view of a squeeze pump provided with a rubber roller for a squeeze pump according to the present invention Cross section of rubber roller that presses the pumping tube Cross section of pumping tube Distribution of seal surface pressure in the axial direction of a roller when a pumping tube with a wall thickness of 22 mm is pressed by rubber rollers of various bulge heights Distribution of seal surface pressure in the roller axial direction when a pumping tube with a wall thickness of 30 mm is pressed by rubber rollers with various bulge heights Roller axial distribution of seal surface pressure when pumping tubes of various thicknesses are pressed by the present invention and conventional rubber rollers The figure which shows a mode that a pumping tube is gradually pressed with a normal crown roller. Distribution of seal surface pressure in the axial direction of the roller when the pumping tube is pressed with a conventional roller Sectional view of a conventional rubber roller that presses the pumping tube Cross section of an extreme crown roller pressing the pumping tube

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Squeeze type pump 3 Pumping tube 3a Inner surface rubber 3b Outer surface rubber 3c, 3d Reinforcement cord layer 4 Rubber roller 6a Cylindrical part 6b Swelling part

Claims (7)

Equipped in a squeeze-type pump, the pumping tube that curves along the inner peripheral surface of the pump case rolls in the axial direction of the tube while pressing it from inside the curve, and the fluid sucked from one end of the pumping tube is discharged from the other end. A rubber roller for a squeeze pump,
Both end portions in the roller axial direction are cylindrical portions having a constant diameter and a fixed length, a central portion in the roller axial direction is a bulging portion that bulges in a curved shape, and the outer peripheral portions of the cylindrical portion and the bulging portion are It is made of rubber, and the cylindrical portion is located at both ends in the roller axial direction of the crushed pumping tube, and the bulging portion is located at the central portion in the roller axial direction of the crushed pumping tube. Rubber roller for squeeze pump.   The rubber roller for a squeeze-type pump according to claim 1, wherein the bulge portion bulges into a spherical shape.   The rubber roller for a squeeze-type pump according to claim 1 or 2, wherein the bulge portion has a bulge height set to 8 mm to 14 mm. A cylindrical pump case, a pumping tube that is curved and installed along the inner peripheral surface of the pump case, and rolls in the axial direction of the tube while pressing the pumping tube from the inside of the curve. A rubber roller for discharging the fluid sucked from one end from the other end,
The rubber roller has a cylindrical portion having a constant diameter and a fixed length at both ends in the roller axial direction, and a bulging portion in which a central portion in the roller axial direction bulges in a curved shape, and the cylindrical portion and the bulging portion The cylindrical portion is located at both ends of the crushed pumping tube in the axial direction of the roller, and the bulging portion is located at the central portion of the crushed pumping tube in the axial direction of the roller. A squeeze-type pump.   The pumping tube has two layers of reinforcing cord layers formed by arranging reinforcing cords that are inclined with respect to the tube central axis direction in the circumferential direction, and the inclination direction of the reinforcing cords arranged in the two layers of reinforcing cord layers The squeeze pump according to claim 4, wherein the squeeze pumps are set so as to cross each other.   6. The squeeze pump according to claim 4, wherein the pumping tube has an inner diameter of φ75 mm to φ200 mm and a wall thickness of 22 mm to 30 mm.   The squeeze pump according to claim 4, 5 or 6, wherein the bulge portion has a bulge height set to 8 mm to 14 mm.

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