JPH0617019Y2 - Elastic tube pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to an elastic tube pump, and more particularly, to a predetermined amount in order to prevent the failure of liquid movement due to fatigue of the elastic tube which is repeatedly subjected to compressive stress by a pressing roller. The present invention relates to an elastic tube pump having a function of moving the elastic tube each time it is driven and pressing it at a new elastic tube portion.

2. Description of the Related Art An elastic tube pump transfers a fluid conducted through an elastic tube by sequentially pressing the fluid in the section of the elastic tube in the transfer direction. Since it has a feature that it does not break down, it is widely used in medical fields such as artificial dialysis and biotechnology, but since the elastic tube is repeatedly compressed in the same section, it is easily fatigued and it can be used for a long time. Due to the low reliability, the elastic tube has been replaced with a new elastic tube after a certain driving time.

In order to solve the above-mentioned problems, the present applicant paid attention to the fact that the elastic tube is clamped and used in a stationary state in order to prevent the elastic tube from moving in the driving direction due to driving friction during driving. It has been proposed to release the clamp and move the elastic tube to the above-mentioned one section to move to a new tube portion after a considerable time when the tube is fatigued.

FIG. 6 is a block diagram for explaining an example of the elastic tube pump, in which 1 is an elastic tube pump, which is concentric with a circular pressing groove 12 bored in the main body 11 around the rotary shaft 13. A cylindrical body 14 that rotates in the direction of the axis is disposed, and a pressing roller 15 of the same size and of the same size that rotates as a planet is provided on the outer periphery of the cylindrical body.
Are provided in plural. The pressing roller 15 and the pressing groove 1
An elastic tube 16 is inserted between the two. The rotary shaft 13 is joined to a drive shaft 23 by a motor 21 via a speed reduction mechanism 22 and rotated. The cylindrical body 14 is the arrow R
When rotating in the direction, the liquid on the liquid supply side 161 communicating with the liquid supply source (not shown) is pumped toward the outflow side 162.
At this time, a force in the rotational direction is applied to the elastic tube 16 by the frictional force between the elastic tube 16 and the pressing roller 15, and this force overcomes the frictional force with the pressing groove 12 so that the elastic tube 16 moves in the direction of the arrow V. Move to. Reference numeral 30 is a well-known clamper, and the elastic tube 1 is composed of clamp pieces 31 and 32.
The elastic tube 16 is prevented from moving by pressing and pinching 6.

Between the clamper 30 and the elastic tube pump 1,
A movement detector 40 is provided, and the elastic tube 16 is movably sandwiched by detection rollers 43 and 44, and the movement of the elastic tube 16 is detected by detecting the rotation of the detection rollers 43 and 44. 24 is a first timer, and the timer 24
Is a predetermined time after the motor 21 rotates, specifically, the time when the elastic tube 16 starts fatigue, for example, 5
Set 00 hours, etc. Reference numeral 25 denotes a second timer, which starts its operation after the set time of the first timer 24, and moves the elastic tube 16 to the clamper 30 when the elastic tube 16 is opened so that the unused portion reaches the pressing groove 12 at a time ΔT. set. A drive circuit 33 is a circuit for energizing the coil 36 of the clamper 30 for ΔT time. Discriminator 50
Is a judging means for judging that the elastic tube 16 has moved within the allowable range during the ΔT time when the clamper 30 is opened, based on the detection signal of the movement detector 40. If it is out of the range, that is, if the elastic tube 16 does not move accurately or moves without stopping, the "no" lamp is turned on.

Problems of the prior art The above-mentioned elastic tube pump has a problem of reliability deterioration, which is a defect caused by fatigue of the elastic tube in the use section of the elastic tube, and the elastic tube in the unused portion is moved to a new elastic tube. The reliability is improved by re-driving, and since it can be used for almost the entire length of the elastic tube, it has high reliability and low cost infusion operation, but it can be used for almost the entire length of the elastic tube. Since the period of moving only the pressing section sequentially extends considerably,
It was not possible to detect the usable limit of the entire length of the elastic tube, and problems such as damage to the elastic tube occurred at this portion.

Means for Solving Problems The present invention has been made to solve the above problems, and when the elastic tube moves sequentially and reaches the length of the use limit, this is detected and an alarm is issued. The purpose of the present invention is to provide an elastic tube pump for transmitting the elastic tube by pressing the elastic tube communicating with the liquid supply source to the inner surface of the pressing groove at two points sandwiching one section in the pressing groove. A pressing roller for sealing the liquid inside, a motor for rotatively driving the pressing roller in one direction, a clamper for locking the movement of the elastic tube moved by the rotational driving of the elastic tube by the motor, and a motor for the motor. When the rotational drive reaches a predetermined time, the lock of the clamper is released, and it is determined whether the amount of movement of the elastic tube due to the release of the lock of the clamper is a predetermined length within a predetermined time. In an elastic tube pump equipped with a container, a conductive plate fixed to a movement limit position of the elastic tube in a section between the liquid supply source of the elastic tube and the elastic tube pump, and the elastic tube being inserted and fixed to the elastic tube pump. The fixed electrode that is separated and fixed to the end face of the fixed electrode mounting cylinder on the side of the conductive plate and the elastic tube move and the conductive plate conducts the fixed electrode, so that the elastic tube reaches the movement limit position. It is equipped with an alarm device that detects and warns when it has reached.

Embodiment FIG. 1 shows an outline of an embodiment of the present invention.
In the block diagram showing the elastic tube pump of FIG. 6, (a) is located in a section between a liquid supply source (not shown) and an elastic tube inflow side 161 communicating with the liquid supply source. Reference numeral 10 is a plate-shaped body on which an elastic tube pump is fixedly mounted on a base. 1
Reference numerals 01 and 101 denote guide rollers, which are BB in FIG. 1 (a).
As shown in FIG. 1 (b) when viewed from the direction of the arrow, a groove 1011 for holding the elastic tube 16 is bored, which is rotatably supported by the stage shaft 102 and fixed to the base 10. It
103 is a stop ring. Reference numeral 104 denotes a fixed electrode mounting cylinder, which is made of an insulating material such as resin and has a through hole 106 formed on the shaft as shown in FIG. 1 (c) viewed from the direction of the arrows CC in FIG. 1 (a). The insulating portion 52 on the end face portion on the liquid supply source side.
The fixed electrodes 1051 and 1052 are adhered to each other with sandwiching therebetween. The fixed electrode mounting cylinder 104 is an L-shaped mounting plate 104.
1, and is fixed to the base 10 with screws 1042. The through hole 106 has a role of a guide which is inserted through the elastic tube 16 and is introduced into the guide roller 101, and it is desirable to install the through hole 106 at a position equal to the height of the groove 1011 of the guide roller 101. Reference numeral 107 denotes a moving electrode mounting ring, as shown in FIG. 1 (d) as viewed from the direction of arrow D-D in FIG. 1 (a), a through hole 109 is bored on the shaft, and the base 10 side. The conductive plate 108 is attached to the surface to be formed. The through hole 109 is inserted through the elastic tube 16 and fixed by an adhesive or the like. An alarm device 501 is a conductive plate 108.
Contacting the fixed electrodes 1051 and 1052 causes the circuit to be closed via the lead wires 51 and 52 and automatically stops the infusion operation. There is.

Next, the above operation will be described. First, after the time determined by the first timer 24 in FIG. 6, the clamper 30 is opened and the elastic tube 16 is moved for the time determined by the second timer 25. In the unused portion of the elastic tube 16, the same operation of moving the elastic tube 16 by opening the clamper 30 for the time determined by the first timer 24 and the time determined by the second timer 25 is performed again. As the conductive plate 108 of the elastic tube 16 having a sufficient length comes into contact between the liquid supply source and the fixed electrodes 1051 and 1052 by repeating the operation, the alarm device 501 is activated via the lead wires 51 and 52. It is a warning that the elastic tube 16 has reached the limit length.

The above-mentioned alarm device 501 has a means for detecting the limit length of movement of the elastic tube 16, and a conductive plate 108 fixed to the elastic tube 16 and a fixed electrode 105 fixed to the base 10.
The circuit board device 501 is operated by closing the switch by the contact of the electrodes with the electrodes 1, 1052, but FIG. 2 shows another detection means.

In FIG. 2A, 163 is a position signal transmitting element in which a conductive metal foil such as aluminum or tin is wound around the elastic tube 16 and adhered, and the position signal transmitting element 163 is the electrode member 20.
A position detection signal is transmitted by contacting with 0. The electrode member 200 includes a base 201 having a holding arm 201a and a base material 2 made of an insulating material such as a resin adhered onto the base 201.
No. 02, and the first comb-shaped electrode 203 and the second comb-shaped electrode 203 to which the lead wires 205 and 206 are connected respectively on the surface of the base material 202.
The comb electrodes 204 are adhered or formed by etching so that the comb shapes are alternately arranged. Second
The electrode member 200 and the elastic tube 16 are shown in FIG.
Are separated from each other by a distance L, but in reality, as shown in FIG. 2B, the elastic force is applied to the concave ring 208a of the guide wheel 208 rotatably supported by the fixed shaft 207 fixed to the base 10. A weak spring 201b, which is inserted through the tube 16 and is disposed outside the holding arm 201a and has one end fixed to a fixing means (not shown), makes the elastic tube 16 always in contact with the surface of the base material 202 and movable. There is. When the position signal transmitting element 163 reaches the base material 202 and comes into contact with the first and second comb-shaped electrodes, the leads 205 and 206 are closed and the alarm device 501 is activated.

FIG. 3 is a view showing another embodiment. In this embodiment, the position signal transmitting element 163 is formed of a metallic foil or the like having a glossy surface that reflects light, and the position of the position signal transmitting element 163 is projected. Optical fiber 22 in which optical fibers for light reception and light reception are bundled
0a and 220b and a lens (not shown) formed on the end face of the optical fiber transmits light to the position signal transmitting element 163.
The light is condensed and reflected on the surface, and the position is detected by the presence of the reflected light.

FIG. 4 is a view showing still another embodiment, in which 230 is a well-known high-frequency position detector, which has a U-shaped cross section in cross section. V-shaped groove 2
A high-frequency magnetic flux generator that includes a high-frequency oscillating circuit and a coil driven by the high-frequency oscillating circuit, and a coil that induces a voltage in synchronization with the high-frequency magnetic flux and a received-wave shaping that detects the induced voltage and outputs a direct current. The output section is built in so as to face it. When a conductive material is inserted into the groove portion 230a, direct current is output and the position of the position signal transmitting element 163 can be detected.

FIG. 5 shows a transparent heat shrinkage of the metal surface of the position signal transmission element 163 in the optical type shown in FIG. 3 and the high frequency position detector shown in FIG. The position detection device shown in FIG. 2 and FIG. 3 is covered and fixed by a pipe 164 and does not deteriorate optical reflectivity and does not affect high frequency loss due to high frequency current. This enables stable position detection similar to.

Effect As described above, according to the elastic tube pump of the present invention, it is possible to eliminate the troubles such as the fatigue breakage of the elastic tube due to the repeated pressing operation of the elastic tube, to enable continuous operation safely for a long period of time, and to use a simple switch. By adding it, a highly reliable infusion can be continuously performed for a long period of time.

[Brief description of drawings]

FIG. 1 is a view for explaining an embodiment of the present invention,
(A) is an overall configuration diagram, (b), (c), and (d) are diagrams respectively showing BB, CC, and DD arrow views in FIG. 1, and FIGS. FIG. 5 is a diagram showing an example of a position detecting device, and FIG. 6 is a block diagram of an elastic tube pump to which the present invention is applied. 1 ... Elastic tube pump, 10 ... Base, 16 ... Elastic tube, 21 ... Drive motor, 24 ... First timer, 25 ...
Second timer, 30 ... Clamper, 40 ... Tube movement amount detector, 101 ... Guide roller, 104 ... Fixed electrode mounting cylinder, 105 ... Fixed electrode, 107 ... Moving electrode mounting ring,
108 ... Conductive plate, 501 ... Alarm device, 163 ... Position signal transmitting element, 200 ... Electrode member, 203, 204 ... Comb-shaped electrode, 220 ... Photosensor, 230 ... High-frequency position detector, 1
64 ... Transparent heat shrinkable pipe.

Claims (4)

[Scope of utility model registration request] 1. An elastic tube 16 communicating with a liquid supply source is provided in the pressing groove 12 at two points sandwiching one section in the pressing groove 12.
2. A pressing roller 15 that presses against the inner surface to seal the liquid in the elastic tube 16, a motor 21 that rotationally drives the pressing roller 15 in one direction, and a rotational drive of the elastic tube 16 by the motor 21 causes movement. The clamper 30 that locks the movement of the elastic tube 16 and the motor 21
When the rotational driving of the clamper 30 reaches a predetermined time, the clamper 30 is unlocked, and whether the elastic tube 16 is moved by the locker 30 is a predetermined length within a predetermined time. In the elastic tube pump 1 equipped with a discriminator 50 for discriminating between the elastic tube 16 and the elastic tube pump 1, the conductive plate 108 fixed to the movement limit position of the elastic tube 16 and the elastic tube Fixed electrodes 1051 and 1 separated and fixed to the end surface on the conductive plate 108 side of the fixed electrode attachment cylinder 104 fixedly installed in the elastic tube pump 1 through the tube 16.
052 and the elastic tube 16 move to move the conductive plate 1
An elastic tube pump, comprising: an alarm device 501 that detects and warns that the elastic tube 16 has reached the movement limit position by connecting 08 the fixed electrodes 1051 and 1052 to each other. 2. A position signal transmitting element 163 made of a metal foil wound around the surface of the elastic tube 16 and detection means for detecting that the elastic tube 16 has reached the movement limit position are alternately provided on the surface of the base material of the insulating material. The first comb-shaped electrode 203 and the electrode member having the second comb-shaped electrode 204, which are the electrodes arranged in parallel, are arranged, and the position signal transmitting element 163 and the electrode member are in contact with each other to form the first comb-shaped electrode 203 and the second The elastic tube pump according to claim 1, wherein the comb-shaped electrode 204 is closed. 3. A position signal transmitting element 163 composed of a light-reflecting foil wound around the surface of the elastic tube 16 and a light projected onto the light-reflecting body as a detecting means for detecting that the elastic tube 16 has reached the movement limit position. The position signal transmitting element 1 is composed of a bundle type optical fiber 220 including a lens system for receiving
The elastic tube pump according to claim 1, wherein the reflected light from 63 is detected. 4. A position signal transmitting element 1 comprising a metal foil of a good electric conductor wound around the surface of the elastic tube 16 as a detecting means for detecting that the elastic tube 16 has reached the movement limit position.
63 and a high-frequency position detector 230 having a U-shaped cross-section with the position signal transmitting element 163 arranged opposite to each other so as to transmit an electric signal from a high frequency loss due to the presence of the position signal transmitting element 163. The elastic tube pump according to claim 1, wherein: