JPS6023009Y2 - Rotating body of centrifuge - Google Patents

Description

[Detailed description of the invention] This invention uses a rotary head in which a plurality of packet storage recesses are equally distributed around the rotation axis, and a hook provided on the cap of the packet to hold the packet in a vertical position when stopped. and a support mechanism configured to rotate the packet by centrifugal force acting on each of the packets when rotated, hold the packet in a horizontal position, and seat the shoulder of the packet in a part of the packet storage recess. This invention relates to improvements in the rotating body of centrifugal separators of the following types.

In order to properly operate the packet support mechanism, the above-mentioned types of conventional rotating bodies all have fairly complex component configurations, and in particular, they have to resist centrifugal force until the shoulder of the packet is seated in its accommodation recess. Since there is only one spring, the applied load is quite high, and there is a concern that some of these parts may crack or break due to repeated use.

In order to solve the above-mentioned problems of the rotating body of conventional centrifuges, this invention consists of a packet support mechanism made up of a small number of simple-shaped parts, and also consists of By improving the springs at two locations to counteract the centrifugal force in order to alleviate the load acting on the spring during the transition period, the number of parts that are at risk of cracking or breaking can be minimized, thereby eliminating the aforementioned concerns. In the rotating body of the centrifuge of the above-mentioned type, the packet support mechanism is provided by a through hole into which a cross pin is fitted which engages with a hook provided on the cap of the packet; an elongated hole and a groove perpendicular to each other at both ends thereof; a leaf spring that is housed in the groove and presses the cross pin in the axial direction of the rotating body; and the hook can swing around the cross pin. The rotating body of a centrifugal separator is characterized in that a bushing having a cavity is inserted and fixed into a pocket of the packet storage recess.

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

Figures 1, 2, and 3 are all partial side sectional views of the right half of this embodiment, with Figure 1 showing the rotating body at rest, and Figures 2 and 3 showing the rotating body. Each shows a rotating state.

FIG. 4 is a partial plan view of the rotating body in the state shown in FIG. 3, viewed from below.

In the figure, 1 is a rotating body head, 2 is its rotating shaft, which is driven to rotate at high speed by an electric motor via a gear system (not shown), 3 is a packet, and 4 is a housing recess thereof. , 5 is a packet support mechanism.

The packet 3 is a test tube-shaped container made of metal, into which a liquid to be centrifuged can be poured by removing a screw-type cap 6, and a hook 7 is integrally provided at the top of the packet 3.

A plurality of packet accommodating recesses 4 are arranged equally around the central axis of the rotating shaft 2 in the rotating body head 1, and a pocket 8 for accommodating and fixing the support mechanism 5 in a part thereof and a pocket 8 for accommodating and fixing the support mechanism 5, and a pocket 8 for accommodating and fixing the support mechanism 5, and a pocket 8 for accommodating and fixing the support mechanism 5 in a part thereof,
The centrifugal force acting on it causes it to rotate outward,
Each is provided with a contact surface 10 on which the shoulder portion 9 rests when finally in the horizontal state.

The support mechanism 5 includes a through hole 12 into which a cross pin 11 for hooking the hook 7 is fitted, a groove 13 perpendicular to the long hole 12 at both ends thereof, a leaf spring 14 housed in the hole, and a plate spring 14 in which the hook 7 is attached to a rotating body. A bushing 16 is inserted and fixed into the pocket 8, and is provided with a cavity 15 that can swing around the cross pin 11 in a plane including the center axes of the bushings 1 and 2.

The arcuate leaf spring 14 is fixed to the groove 13 in a cantilever manner by a spring holding piece 17 at the upper end of the groove 13, and the cross pin 11 is moved between the rotating bodies 1 and 2 by its elastic force at the center. It is always pressed in the axial direction.

Numeral 18 is a set screw that prevents the bushing 16 from falling out of the pocket 8.

Next, the operation in this embodiment will be explained. When the rotating bodies 1 and 2 are stopped, the cross pin 11
is pressed in the axial direction of the rotating body 1.2 by the elastic force of the leaf spring 14, so that it is pressed against one edge of the elongated hole 12.

Now, the packet 3 containing the liquid to be centrifuged as described above is applied from the packet storage recess 4 to the rotating body head 1, and the hook 7 is inserted into the cavity 15 and hooked on the cross pin 7. It is hung in a vertical position as shown in the figure.

Next, when the rotary shaft 2 is rotationally driven by the electric motor through a gear device (not shown), the packet 3 is rotated by the hook 7 due to the rotational moment imparted from the centrifugal force acting on it.
is rotated gradually outwardly around the cross pin 11 via the cross pin 11.

In this case, either a centrifugal force acts on the cross pin 11 via the hook 7, or the cross pin 11 is made to be able to slide left and right along the elongated hole 12, so the leaf spring 13 in contact with the cross pin 11 is It acts to resist the elastic force and press down.

This state is shown in FIG. 2, where the elastic force of the leaf spring 14 and the centrifugal force acting on the hook 7 are
1, the packet 3 also moves outward with the above-mentioned slight movement of the cross pin 11, but the shoulder 9 of the packet 3 and a part of the packet accommodation recess 4 of the rotary head 1 Since a gap is left between the packet 3 and the contact surface 10 provided on the rotor head 1, the shoulder 9 of the packet 3 almost enters the packet accommodation recess 4 of the rotary head 1 without receiving any resistance. It happens.

When the rotational speed of the rotating bodies 1 and 2 is further increased, the centrifugal force acting on the packet 3 is increased, the cross pin 11 further moves outward along the elongated hole 12, and the pressing force further deforms the leaf spring 13. .

When the center of gravity of the entire packet 3 comes within the horizontal plane passing through the contact point between the cross pin 11 and the hook 7, the rotational speed of the rotating bodies 1 and 2 is further increased, and the centrifugal force acting on the center of gravity of the entire packet 3 is increased. Even if the packet 3
rotates together with the rotating body head 1 while maintaining a constant horizontal attitude.

In this state, as shown in FIG.
A contact surface 10 whose shoulder portion 9 is a part of the packet accommodation recess 4
When the packet 3 is rotated around the rotating body 1.2 while maintaining a predetermined maximum rotational speed, the component of the reaction force Fr that the packet 3 receives from the contact surface 10 and the center of gravity of the packet 3 balance with the centrifugal force Fc acting on the

In this case, if the angle of inclination of the contact surface 10 is determined so that the reaction force Fc passes through the contact point between the hook 7 and the cross pin 11, no rotational moment will be generated on the packet 3 from the reaction force Fc, so the packet 3 continues to maintain the stable posture shown in FIG. 3, and almost no load acts on the cross pin 11 other than the pressing force from the leaf spring 14.

A leaf spring 14 counteracts the centrifugal force during the transition period until the shoulder portion 9 of the packet 3 is seated on the contact surface 10.
Since the springs are provided at two locations, the load generated on the springs can be alleviated.

As is clear from the above explanation, in the rotating body of the centrifuge according to this invention, the packet support mechanism is
It is composed of a few simple parts such as bushes, cross pins, and leaf springs, and is designed to resist centrifugal force with two leaf springs, so as the rotating body increases its rotation, The support mechanism is operated by the centrifugal force that gradually increases and acts on the packet, and the load acting on the spring during the transition period until the packet is seated is kept at about half of the conventional load, and the load is reduced even after repeated use many times. By minimizing the occurrence of fatigue cracks or breakage in these parts, it is possible to provide a device that is free from anxiety about accidents caused by fatigue damage during use.

[Brief explanation of drawings]

Figures 1, 2, and 3 are all partial side sectional views of the right half of the embodiment, with Figure 1 showing the state in which the rotating body is stopped, and Figures 2 and 3 showing the state in which the rotating body is not moving. 4 shows a rotating state, and FIG. 4 is a partial plan view of the rotating body in the state shown in FIG. 3, viewed from below. 1... Rotating body head, 2... Rotating shaft,
1, 2...Rotating body, 3...Packet,
4... Packet accommodation recess, 5... Support mechanism, 6... Cap, 7... Hook, 8... Pocket, 9... ...Shoulder, 11
...Cross pin, 12 ...Elongated hole, 13
...Groove, 14...Plate spring, 15...
...Gap, 16...butsu.

Claims (1)

[Scope of utility model registration request] The packets are held in a vertical position when stopped, and are held in a vertical position through a rotating body head in which a plurality of packet storage recesses are equally distributed around the rotation axis, and hooks provided on the caps of each of these packets, and when rotating, each packet is held in a vertical position. A rotary body comprising a support mechanism that is rotated by an applied centrifugal force and held in a horizontal position, and a shoulder portion of the packet is seated in a part of the packet storage recess. , a through elongated hole in which a cross pin that engages with the hook is fitted, a groove perpendicular to the elongated hole at both ends thereof, and a groove that is accommodated in the groove and presses the cross pin in the axial direction of the rotating body. 1. A rotating body for a centrifuge, characterized in that a bushing is inserted and fixed into a pocket of the packet storage recess, the bushing having a leaf spring and a gap in which the hook can swing around the cross pin.