JP4118116B2 - Tube type pump device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube-type pump device that transfers a liquid in a tube by moving a crushing member while crushing an elastic tube.
[0002]
[Prior art]
For tube pump devices that transfer liquid in the tube by moving the crushing member along the elastic tube while the elastic tube is crushed by a crushing member such as a roller, in the fields of food, cosmetics, pharmaceuticals, chemistry, etc. Use is expected.
[0003]
In this type of pump device, generally, a cam body to which a driving force from a driving source is transmitted and a roller support body for supporting a tube crushing roller are provided, and the roller is retracted by a cam surface formed on the cam body. The elastic tube is crushed with a roller by appearing from the position to the crushing position.
[0004]
However, when the cam mechanism is employed, the cam does not work if the cam body and the roller support are rotated when the roller is displaced on the cam surface. Therefore, conventionally, a frictional force is always applied to the roller support body to prevent the cam body and the roller support body from rotating.
[0005]
[Problems to be solved by the invention]
For such a tube type pump device, the present applicant has also filed a patent application as Japanese Patent Application No. 2001-337502. However, in a configuration in which a frictional force is always applied to the roller support, the motor has a drive load torque. A large torque including the frictional force (braking force) is always applied. For this reason, since the enlargement of a motor and the remarkable raise of motor temperature cannot be avoided, the improvement is desired. Further, in a braking mechanism that always works, the wear at this portion is intense, so it is desired to improve this point and further improve the reliability.
[0006]
In view of the above problems, the subject of the present invention is a tube type that can prevent the crushing member from rotating while suppressing the increase in the size of the motor and the temperature rise, and can reliably displace the crushing member by the cam. It is to provide a pump device.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, in the present invention, a wall surface, an elastic tube that is disposed along the wall surface, and the inside of which is used as a flow path, and a crush that is disposed so as to sandwich the elastic tube between the wall surfaces A tube-type pump device that transfers liquid in the elastic tube by moving the crushing member along the wall surface while crushing the elastic tube, and causing the crushing member to approach the wall surface. The crushing member is moved to the crushing position and the retreating position by a crushing member support that is displaceably supported between a crushing position and a retreating position separated from the wall surface, and a cam surface to which a driving force from a driving source is transmitted A cam body to be displaced, an engagement mechanism for causing the crush member support body to start interlocking with the cam body after a predetermined play period when the cam body starts to move, and the crush member Upon movement, characterized in that it has a braking force generating means for intermittently applying a braking force to the crushing member support.
[0008]
In the present invention, it is intermittent that the braking force generating means applies the braking force to the crushing member support. Therefore, the braking force does not act unless the timing is reached. Therefore, even during the previous period and the play period, the crushing member support may move around with the cam body while the crushing member is being moved from the retracted position to the crushing position by the cam. It does not cause any problem because it occurs for a while until the braking force is applied at a predetermined timing. Further, since the braking force acts only intermittently, the load torque to the motor is small. Therefore, an increase in the size of the motor and a significant increase in the motor temperature can be avoided. In addition, since the braking force generating means generates the braking force only intermittently, there is an advantage that the wear at the sliding portion that generates the braking force can be suppressed and the reliability is improved.
[0009]
In the present invention, the crushing member support is, for example, a rotating member including a pair of support plates that hold a roller as the crushing member therebetween. In such a configuration, the crushing member support Around the elastic tube and the wall surface are arranged.
[0010]
In the present invention, the braking force generating means includes, for example, a braking protrusion protruding outward from the crushing member support and a spring member elastically contacting the braking protrusion around the crushing member support. Composed.
[0011]
In the present invention, a plurality of the rollers are supported at positions spaced apart in the circumferential direction on the crushing member support, and the braking protrusions are formed in the vicinity of the rollers being supported, and the spring member Is preferably arranged at a position out of the area where the roller crushes the elastic tube, around the crushing member support. If comprised in this way, even if it will become a timing which generates a braking force, while a crushing member is moving, crushing an elastic tube, at least 1 roller will remove | deviate from the position which crushes an elastic tube. For this reason, the load applied to the motor can be reduced at the timing of generating the braking force.
[0012]
When comprised in this way, it is preferable that the said braking force generation | occurrence | production means generate | occur | produces the braking force of the direction which presses one of the said rollers to the said elastic tube. If comprised in this way, while the force which a spring member presses will act as a force which a roller crushes an elastic tube, the force which an elastic tube repels to this crushing can be received with a spring member.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0014]
1 (A) and 1 (B) are an explanatory view illustrating a configuration of a main part of the tube type pump device according to the present embodiment and a sectional view of the pump device. FIG. 2 is an explanatory diagram at the time of starting the liquid transfer from the state shown in FIG. FIG. 3 is a perspective view showing a state in which the tube type pump device of the present embodiment is disassembled into a case and a rotating body. 4A and 4B are respectively a perspective view showing a state in which the rotating body shown in FIG. 3 is disassembled into a roller support, a pair of end plates, and a tube crushing roller, and a pair of support plates. It is the perspective view which looked at the support plate arrange | positioned below from diagonally downward. 5A, 5B, and 5C are a plan view, a cross-sectional view taken along line AA ′, and a bottom view, respectively, of the roller support. 6A and 6B are a front view and a side view of a tube crushing roller, respectively. In FIGS. 1A and 2, cam surfaces described later are given a diagonal line that rises to the right, and the engaging plate part is given a diagonal line that descends to the right to make their positions easy to understand. .
[0015]
1A, 1B, 2, 3 and 4, the tube type pump device 1 of this embodiment is formed on a case 2 having a rectangular planar shape and on the upper surface of the case 2. A rotating body 3 rotatably accommodated in a substantially circular accommodation hole 21, an elastic tube 6 accommodated in the accommodation hole 21 together with the rotating body 3 so as to surround the rotating body 3, and a stepping as a drive source The elastic tube 6 has a tube crushing roller 7 held by the rotating body 3 and a storage hole 21. The reduction gear mechanism is used to transmit the rotational driving force from the motor 11 to the rotating body 3. Between the inner wall 20 and the inner wall 20.
[0016]
The case 2 is made of plastic, and two U-shaped holes 28 for pulling out the elastic tube 6 to the outside are formed in one of the four sides. A metal leaf spring 29 is formed on the inner wall portion of this portion. Is fixed. In the case 2, a circular recess is formed at the center of the storage hole 21, and the support shaft 23 stands upright at the center of the circular recess.
[0017]
A stepping motor 11 is disposed on the lower surface of the case 2, and a pinion 12 is attached to the output shaft of the stepping motor 11. A gear 13 meshes with the pinion 12, and the gear 14 formed at the upper end of the gear 13 is positioned on the side of the support shaft 23 in the housing hole 21 of the case 2.
[0018]
The rotating body 3 includes a roller support 4, two rollers 7 for tube crushing, and a cam body 5 described below.
[0019]
Among these members, as shown in FIGS. 5A, 5B, and 5C, the roller support 4 includes a circular first support plate 41 positioned below and the first support. It is composed of a single piece comprising a circular second support plate 42 facing upward with respect to the plate 41, and a cylindrical portion 43 connecting the first support plate 41 and the second support plate 42 at the center. Yes.
[0020]
Each of the first support plate 41 and the second support plate 42 includes two arc-shaped elongated holes 46 that are cut long in the circumferential direction, and a portion sandwiched between ends of the arc-shaped elongated holes 46. Two elongated holes 45 extending narrowly in the radial direction are formed. In each of the first support plate 41 and the second support plate 42, the two arc-shaped elongated holes 46 are formed symmetrically around the cylindrical portion 43, and the two elongated holes 45 are also centered around the cylindrical portion 43. It is formed symmetrically. Further, the first support plate 41 and the second support plate 42 are formed at positions where both the arc-shaped elongated holes 46 and both the elongated holes 45 overlap.
[0021]
A portion where the first end plate 51 is disposed is surrounded by an annular plate portion 49 on the lower surface of the first support plate 41 disposed below, and in this embodiment, of the outer peripheral side of the annular plate portion 49. In the same angular position as the long hole 45, that is, in the vicinity where the two rollers 7 are supported, braking protrusions 48 projecting in an arc shape are formed on the outer peripheral side.
[0022]
In the roller support 4 configured as described above, both ends of the rotation center shaft 75 of the tube crushing roller 7 are inserted into the long holes 45 of the first support plate 41 and the second support plate 42, and the cylindrical portion. Two rollers 7 are supported at symmetrical positions around 43. In this state, the roller 7 can rotate around the rotation center shaft 75 and can move in the radial direction within a range where the elongated hole 45 is formed.
[0023]
Here, as shown in FIGS. 6A and 6B in an enlarged manner, the roller 7 has a roller surface 70 (collapsed surface) formed with raised portions 71 on both sides in the width direction, and a central portion 74. Slightly concave curved shape.
[0024]
Further, as shown in FIGS. 5A, 5B, and 5C, an elastic tube is formed from both the outer peripheral edge of the inner surface of the first support plate 41 and the outer peripheral edge of the inner surface of the second support plate 42. Rib-shaped tube position regulating projections 40 that regulate the position of 6 in the center in the width direction of the roller surface 70 are formed at both the front position and the rear position of the roller 7.
[0025]
1A, 1B, 2, 3 and 4, the cam body 5 includes a circular first end plate 51 positioned below and a circular second end positioned above. The first end plate 51 is disposed below the roller support body 4, the second end plate 52 is disposed above the roller support body 4, and the second end plate 52 of the second end plate 52 is provided. If the connecting cylinder 55 protruding downward from the center is fitted into the hole 56 formed in the center of the first end plate 51 through the cylindrical portion 43 of the roller support 4, the first end plate 51 and the second end plate 51 are connected. The end plate 52 is connected with the roller support 4 interposed therebetween.
[0026]
Here, two engagement plate portions 57 protrude downward from the second end plate 52, while the first end plate 51 is formed with a rectangular hole 58 into which the engagement plate portion 57 is fitted. . For this reason, when connecting the 1st end plate 51 and the 2nd end plate 52 on both sides of the roller support body 4, it is the arc-shaped length formed in the 1st support plate 41 and the 2nd support plate 42 The engaging plate portion 57 is passed through the hole 46 and the lower end portion of the engaging plate portion 57 is fitted into the hole 58 formed in the first end plate 51 to connect the first end plate 51 and the second end plate 42. .
[0027]
In this state, both end portions of the rotation center shaft 75 of the roller 7 protruding outward from the first support plate 41 and the second support plate 42 are the inner surface (upper surface) of the first end plate 51, and On the inner surface (lower surface) of the second end plate 52, the second end plate 52 is located at a portion where the cam surface 50 is formed.
[0028]
The cam surface 50 is formed in the same cam shape so as to overlap each other as a stepped portion facing the outer peripheral side on both the inner surface of the first end plate 51 and the inner surface of the second end plate 52. Here, both the cam surfaces 50 are retracted cam surfaces 501 located on the inner side in the radial direction, and two crushing cam surfaces 503 located on the outer sides in the radial direction on both sides of the retracted cam surface 501 are retracted. The cam surface 501 and the two crushing cam surfaces 503 are composed of two intermediate cam surfaces 502 formed of slopes.
[0029]
In the tube-type pump device 1 having such a configuration, when the elastic tube 6 is wound around the outer peripheral side of the rotating body 3, the elastic tube 6 is supported from the inside by the roller 7, so in this state, the housing hole of the case 2 The rotating body 3 and the elastic tube 6 are accommodated in 21. At that time, the support shaft 23 is passed inside the connecting cylinder 55 and the gear 15 formed on the lower surface of the first end plate 51 is engaged with the gear 14 to which the rotation output is transmitted from the stepping motor 11. Match.
[0030]
In this state, as shown in FIG. 1A, both ends of the rotation center shaft 75 of the roller 7 are located at positions corresponding to the retreating cam surface 50 in the cam surface 50. The elastic tube 6 is not in a state of being crushed in the radial direction. Further, the braking protrusion 48 of the roller support 4 is in contact with the leaf spring 29, and a braking force is applied to the roller support 4.
[0031]
When the stepping motor 11 is operated from this state and the rotational driving force is transmitted to the cam body 5 via the pinion 12 and the gears 123, 14 and 15, the cam body 5 rotates, for example, in the counterclockwise CCW direction. Then, the cam surface 50 moves relative to both ends of the rotation center shaft 75 of the roller 7. As a result, both end portions of the rotation center shaft 75 of the roller 7 slide on the intermediate cam surface 502 and ride on the crushing cam surface 503. In this state, the roller 7 is pushed outward and the elastic tube 6 is crushed. Such an operation is the same even when the cam body 5 rotates in the clockwise direction.
[0032]
Here, when both ends of the rotation center shaft 75 of the roller 7 slide on the intermediate cam surface 502, a rotational force is also applied to the roller support 4, but the braking protrusion 48 of the roller support 4 has a leaf spring 29. A braking force is applied to the roller support 4. For this reason, the roller support 4 does not rotate with the cam body 5 until both ends of the rotation center shaft 75 run on the crushing cam surface 503, so that both ends of the rotation center shaft 75 are securely connected to the crushing cam surface 503. Will ride on.
[0033]
However, in this state, the engagement plate portion 57 only moves in the arc-shaped elongated hole 46, and only the cam body 5 rotates, and the roller support body 4 does not rotate. In this idle section, the braking protrusion 48 of the roller support 4 is in contact with the leaf spring 29 and a braking force is applied to the roller support 4, so that the roller support 4 rotates with the cam body 5. Does not cause.
[0034]
Then, when the cam body 5 further rotates and the rotation center shaft 75 of the roller 7 abuts against the wall 505 of the crushing cam surface 503, the rotation of the cam body 5 is transmitted to the roller support body 4. The elastic tube 6 is moved while being crushed. As a result, the liquid is transferred by the roller 7 inside the elastic tube 6.
[0035]
Thus, in this embodiment, when the cam body 5 starts to move, an engagement mechanism is configured to cause the roller support body 4 to start interlocking with the cam body 5 after a predetermined play period.
[0036]
At that time, the roller support 4 rotates by the force received from the cam body 5, and the braking projection 48 passes by pushing away the leaf spring 29. Then, the braking force does not act on the roller support 4 until the braking protrusion 48 abuts against the leaf spring 29 again.
[0037]
As described above, in this embodiment, since the braking protrusion 48 and the leaf spring 29 apply the braking force to the roller support 4 intermittently, the braking force does not act unless the timing is reached. Accordingly, even during the previous period and the idle period, when the roller 7 is moved from the retracted position (radially inward) to the crushed position (radially outward) by the cam surface 50, the roller support 4 and the cam 5 Although there is a possibility that such a rotation will occur, there is no problem because such a rotation occurs for a while until a braking force is applied at a predetermined timing. Further, since the braking force acts only intermittently, the load torque to the stepping motor 11 is small. Therefore, an increase in the size of the motor and a significant increase in the motor temperature can be avoided.
[0038]
Moreover, since it is intermittent that the braking protrusion 48 and the leaf spring 29 apply the braking force to the roller support 4, the timing braking force generation means generates the braking force only intermittently. There is an advantage that wear of the projection 48 and the leaf spring 29 can be suppressed, and reliability is improved.
[0039]
In this embodiment, the roller support 4 supports two rollers 7 at positions spaced apart from each other in the circumferential direction, and is provided with a braking protrusion 48 in the vicinity where the roller 7 is supported. The spring 29 is disposed at a position outside the region where the roller 7 crushes the elastic tube 6 around the roller support 4. For this reason, at least one roller 7 is out of a position where the elastic tube 6 is crushed even when the braking force is generated while the roller 7 is moving while crushing the elastic tube 6. For this reason, the load applied to the motor can be reduced at the timing of generating the braking force.
[0040]
Furthermore, the braking protrusion 48 and the leaf spring 29 generate a braking force in a direction in which the roller 7 is pressed against the elastic tube 6. For this reason, the force pressed by the leaf spring 29 acts as a force by which the roller 7 crushes the elastic tube 6 and improves the liquid-tightness at the time of crushing, while the force that the elastic tube 6 repels against this crushing is applied to the leaf spring 6. Can be received at.
[0041]
Furthermore, in this embodiment, the roller surface 70 (crush surface) of the roller 7 is formed in a curved shape having raised portions 71 on both sides in the width direction, but the roller support 4 is provided with an elastic tube 6. Tube position restricting projections 40 that restrict the position in the center of the roller surface 70 in the width direction are formed before and after the roller 7. Therefore, since the elastic tube 6 is always located at the center 74 in the width direction of the roller surface 70, a situation in which the elastic tube 6 is crushed by the edge of the roller 7 or the raised portion 71 does not occur. In addition, since the tube position regulating projections 40 are arranged at both the front position and the rear position of the roller 7, the elastic tube 6 is moved in the width direction of the roller surface 70 when the roller 7 moves in any direction. The position can be reliably regulated at the center 74. Therefore, the elastic tube 6 is less likely to be damaged, such as wear and tear, so that the life of the elastic tube 6 can be extended.
[0042]
(Other embodiments)
In the said form, although the roller was used as a crushing member, the other crushing member may be sufficient. In addition, the crushing member is an example that is supported on the rotating body and performs a rotational motion, but the present invention can also be applied to those in which the crushing member performs a linear motion or other operations.
[0043]
【The invention's effect】
As described above, in the present invention, it is intermittent that the braking force generating means applies the braking force to the crushing member support, so that the braking force does not act unless the timing is reached. Therefore, even during the previous period and the play period, the crushing member support may move around with the cam body while the crushing member is being moved from the retracted position to the crushing position by the cam. It does not cause any problem because it occurs for a while until the braking force is applied at a predetermined timing. Further, since the braking force acts only intermittently, the load torque to the motor is small. Further, it is assumed that at least one roller is configured to be out of a position where the elastic tube is crushed even when it is time to generate a braking force while the crushing member is moving while crushing the elastic tube. At the timing of generating the braking force, the load applied to the motor can be further reduced. Therefore, an increase in the size of the motor and a significant increase in the motor temperature can be avoided. In addition, since the braking force generating means generates the braking force only intermittently, there is an advantage that the wear at the sliding portion that generates the braking force can be suppressed and the reliability is improved.
[Brief description of the drawings]
FIGS. 1A and 1B are an explanatory view illustrating a configuration of a main part of a tube type pump device to which the present invention is applied, and a cross-sectional view of the pump device.
FIG. 2 is an explanatory diagram of a point in time when liquid transfer is started from the state shown in FIG.
FIG. 3 is a perspective view showing a state in which the tube type pump device shown in FIG. 1 is disassembled into a case and a rotating body.
4A and 4B are perspective views showing a state in which the rotating body shown in FIG. 3 is disassembled into a roller support, a pair of end plates, and a tube crushing roller, and a pair of support plates, respectively. It is the perspective view which looked at the support plate arrange | positioned below from diagonally downward.
FIGS. 5A, 5B, and 5C are a plan view, a cross-sectional view, and a bottom view, respectively, of a roller support.
FIGS. 6A and 6B are a front view and a side view of a tube crushing roller, respectively.
[Explanation of symbols]
1 Tube-type pump device 2 Case 3 Rotating body 4 Roller support 5 Cam body 6 Elastic tube 7 Tube crushing roller (crushing member)
11 Stepping motor 20 Inner wall (wall surface) of storage hole
21 Housing hole 29 Plate spring 40 for braking Tube position restricting projection (tube position restricting means)
41, 42 Support plate 45 Elongated hole 46 Arc-shaped elongated hole 48 Braking protrusion 50 Cam surface 51, 52 End plate 57 Engaging plate portion 70 Roller surface (collapse surface)
71 Swelling portion 75 Roller rotation shaft 501 Retraction cam surface 503 Crush cam surface

Claims (5)

A wall surface, an elastic tube disposed along the wall surface, the inside of which is a flow path, and a crushing member disposed so as to sandwich the elastic tube between the wall surface, In the tube type pump device for transferring the liquid in the elastic tube by moving along the wall surface while crushing the elastic tube,
A crushing member support that supports the crushing member so as to be displaceable between a crushing position where the crushing member is brought close to the wall surface and a retracted position separated from the wall surface;
A cam body that displaces the crushing member to the crushing position and the retracted position by a cam surface to which a driving force from a driving source is transmitted;
An engagement mechanism for causing the crushing member support body to start interlocking with the cam body after a predetermined play period when the cam body starts moving;
A tube-type pump device comprising braking force generating means for intermittently applying a braking force to the crushing member support when the crushing member moves. In Claim 1, the crushing member support is a rotating member comprising a pair of support plates that hold a roller as the crushing member therebetween,
The tube type pump device, wherein the elastic tube and the wall surface are arranged around the crushing member support. 3. The braking force generating means according to claim 2, wherein the braking force generating means includes a braking protrusion protruding outward from the crushing member support and a spring member elastically contacting the braking protrusion around the crushing member support. A tube type pump device characterized by being made. In claim 3, the crushing member support body is supported by a plurality of rollers spaced apart in the circumferential direction, and the braking protrusions are formed in the vicinity where the rollers are supported,
The tube-type pump device, wherein the spring member is disposed at a position out of a region where the roller crushes the elastic tube, around the crushing member support. 5. The tube type pump device according to claim 4, wherein the braking force generating means generates a braking force in a direction in which any one of the rollers is pressed against the elastic tube.

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