JP2766002B2 - Clamp opening and closing mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a clamp opening / closing mechanism. More specifically, the present invention relates to a clamp opening / closing mechanism that is used when clamping an infusion tube or the like, reduces current consumption, and can be applied to a tube having a large diameter.

[Problems to be Solved by Related Art and Invention] When performing infusion treatment using an infusion or blood transfusion (hereinafter, represented by infusion) set, as a method of stopping or restarting the supply of infusion. There is a method of clamping an infusion tube using an electromagnetic solenoid coil.

Conventionally, such a tube was clamped directly with the iron core of an electromagnetic solenoid coil (see FIG. 6).

However, the conventional method of directly clamping the tube with an iron core requires a large holding current because the tube is clamped against the resilience of the tube, and accordingly generates a lot of heat from the solenoid coil. There is a problem that the instrument burns in or the instrument malfunctions due to the temperature rise of the entire apparatus. In addition, the tube that can be clamped is limited due to the small moving distance of the iron core,
It could not be applied to large diameter tubes.

The present invention has been made in view of the above circumstances, and has as its object to provide a clamp opening / closing mechanism in which the drawbacks of the above-mentioned prior art are eliminated. That is, an object of the present invention is to provide a clamp opening / closing mechanism that can reduce power consumption during holding and can clamp a tube having a large diameter.

[Means for Solving the Problems] The clamp opening / closing mechanism of the present invention comprises a pair of tube pressing pins formed of a short rod-shaped member having a ridge-shaped tube pressing portion, a short columnar base portion and a truncated cone-shaped member. The head includes an intermediate portion and a conical tip, and is connected to the iron core of the electromagnetic solenoid coil. The tip has a smaller inclination angle at the tip than at the intermediate portion, and is provided with a spring. By causing the head to enter the gap between the holding pins that are disposed in parallel with each other with a gap therebetween by the force, the holding pins are configured to move in parallel to move away from each other against the urging force of the spring. It is characterized by becoming.

Hereinafter, a clamp opening / closing mechanism of the present invention will be described with reference to the accompanying drawings.

1 is a schematic explanatory view of a clamp opening / closing mechanism according to an embodiment of the present invention when a tube is closed, FIG. 2 is a sectional explanatory view showing a state in which the tube is closed, and FIG. 3 is an embodiment of the embodiment shown in FIG. FIG. 4 is a schematic explanatory view showing a state in which the tube is opened, and FIG.

1 and 2, (1) is a pair of holding pins having a ridge-shaped tube pressing portion (2). The holding pin (1) is made of a short rod-shaped member made of metal, for example, stainless steel, brass, or a slippery hard synthetic resin, for example, ABS resin, polypropylene, or nylon. The holding pin (1) is arranged in parallel so that the tube pressing portion (2) faces each other, and a spring (3) is provided on a surface opposite to the tube pressing portion (2).

When a head (4), which will be described later, is not inserted between the presser pins (1), that is, when the electromagnetic solenoid coil is de-energized, the presser pin (1) causes the gap (8) to move by the urging force of the spring (3). They are separated. At this time, the tube (11) is in a closed state.

The head (4) moves perpendicular to the moving direction of the presser pin (1) (direction of the biasing force of the spring (3)) when energized, enters between the presser pins (1), and presses the presser pin (1).
It has the function of extending the interval between comrades. The head (4) has a short cylindrical base (4a) and a truncated cone-shaped intermediate part (4b).
And a conical tip (4c), made of metal such as stainless steel or brass, a slippery hard synthetic resin,
For example, it is made of ABS resin, polypropylene or nylon. The inclination angle of the head (4) is changed in two steps, and the inclination angle (β) of the tip (4c) is smaller than the inclination angle (α) of the intermediate part (4b). .

The head (4) is fixed to the end of the iron core (6) of the electromagnetic solenoid coil (5) on the opposite side to the iron plate (7).

The reason why the inclination angle of the head (4) is changed in two stages is based on the following reason. That is, the force from the spring (3) acts perpendicular to the inclined surface, and this force is, as shown in FIG. 5, the axial force of the iron core (6) and the force perpendicular to the axis. And can be divided into Among them, the axial force is a force for pushing back the iron core (6), and conversely, the electromagnetic solenoid coil needs to have a holding force enough to oppose this force. The larger the angle of inclination, the smaller this holding force is. On the other hand, if the angle of inclination is increased, the moving distance of the solenoid coil is limited, so that the interval between the presser pins cannot be greatly increased. That is, it cannot be used for a tube having a large diameter.

Therefore, two steps are taken to increase the distance between the presser pins so that it can be applied to large-diameter tubes and to reduce the repulsive force (force to return the iron core) during holding to reduce the holding current. The structure is as follows.
That is, the moving distance of the presser pin (1) is increased by decreasing the inclination angle (β) of the tip (4c), while the inclination angle (α) of the intermediate part (4b) is increased to increase the spring (4). To reduce the repulsion from the vehicle.
The magnitudes of the inclination angles (α) and (β) are not particularly limited in the present invention, but are approximately 70 ° <α <90 ° and 30 °, respectively.
<Β <70 ° is a guide. However, when the tube diameter is large, the angle of β becomes small. It is better to increase α in order to reduce the holding current.

Next, the operation of the clamp opening / closing mechanism of the present invention will be described.

First, when the electromagnetic solenoid coil (5) is not energized,
A pair of holding pins (1) by the urging force of the spring (3)
Are close together, forming a gap (8) between them. At this time, the tube (11) is in a closed state, and the movement of the internal fluid is stopped.

Next, when the electromagnetic solenoid coil (1) is energized, the iron core (6) moves upward in FIG. 3 by magnetic force.
Then, the tip (4c) of the head (4) fixed to the iron core (6) first enters between the presser pins (1), and then the intermediate part (4b) enters. The arrangement of the electromagnetic solenoid coil (5) and the holding pin (1) is selected such that the holding pin (1) comes into contact with the intermediate portion (4b) of the head (4) when holding the electromagnetic solenoid coil (5). I have. In this state, the holding pin (1) is expanded against the urging force of the spring (3), the clamp of the tube (11) is released, and the fluid in the tube (11) can move. When the power supply to the electromagnetic solenoid coil (5) is stopped, the iron core (6) returns to the state shown in FIG. 1, and the tube (11) is closed again.

[Effects of the Invention] As described above, in the clamp opening / closing mechanism of the present invention, the head has a two-stage structure, and the inclination angle of the tip portion is smaller than that of the middle portion. Then, by dividing the role between the part where the presser pin is opened and the part where the presser pin is held open, current consumption during holding can be reduced. For this reason, it is possible to save energy and reduce the heat generation of the coil, and it is possible to prevent the temperature rise of the entire apparatus due to the heat generation and seizure of the clamp due to the heat generation.

Further, the present invention can be applied to a tube having a large diameter. Further, since the tube can be set from the front, the operation is simplified.

[Brief description of the drawings]

1 is a schematic explanatory view of a clamp opening / closing mechanism according to an embodiment of the present invention when a tube is closed, FIG. 2 is a sectional explanatory view showing a state in which the tube is closed, and FIG. FIG. 4 is a schematic explanatory view showing a state in which the tube is opened, FIG. 5 is an explanatory view of a force acting on the head, and FIG. 6 is an explanatory view of a conventional clamp. (Main symbols in the drawings) (1): Holding pin (3): Spring (4): Head (5): Electromagnetic solenoid coil (6): Iron core (11): Tube

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61M 1/14 595 F16K 7/06

Claims (1)

(57) [Claims] 1. A pair of tube holding pins formed of a short rod-shaped member having a ridge-shaped tube pressing portion, a short columnar base portion, a truncated cone-shaped intermediate portion, and a conical tip portion, The head is connected to the iron core of the electromagnetic solenoid coil, and the inclination angle of the head is smaller at the tip end than at the middle part, and the head is arranged in parallel with the gap by the biasing force of the spring. A clamp opening / closing mechanism characterized in that the presser pins are moved in parallel to move away from each other against the urging force of a spring by allowing the head to enter the gap between the presser pins.