JPH0551461U - Door lock mechanism of centrifuge - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the airtightness and safety of the rotor chamber and door of the centrifuge, and to simplify the opening and closing operation of the door. [Structure] The door lock device is unlocked by a rotation signal of the rotor, then the door is opened, the open / closed state of the door is recognized, and if the door is closed, the door is locked immediately. It has a structure that can be hooked on the nail.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a door lock mechanism which is a safety device of a centrifuge used in fields such as medicine, biochemistry and agricultural chemistry.

[0002]

[Prior Art]

 As the conventional door lock mechanism, the following two methods A and B are generally used.

In the A method, the claw of the lock device is pressed by the spring force so that the door is locked at any time when the door is closed, and when the door hook enters there, the claw is caught by the claw and cannot be removed. I am doing it. When opening the door, the door switch was pressed and the force of solenoid etc. was used to release the lock device for a certain period of time, during which the door was opened.

The other B method is to lock the door by a rotation detection signal of the rotor (or motor), and always release the lock device while the rotor (or motor) is stopped so that the door can be opened. Was there. Such a structure is, for example, Utility Model Sho 63-152653 filed by the applicant before the application of this utility model. When the rotor (or motor) started to rotate, the locking device actuated, locking the door (Fig. 4).

[0005]

[Problems to be solved by the device]

 In the case of the conventional A method, the door is always locked and it is safe and the airtightness between the door and the rotor chamber can be maintained. There was

Further, in the case of the conventional method B, when the rotor stops rotating, the lock device is released, so there is no inconvenience unlike the method A. However, in order to automatically lock the door in response to the rotation signal of the rotor, a gap is required between the door hook and the door lock device claw. If the gap is small, the hook may not be caught by the hook and may not be locked, or may be incomplete.

Further, if the gap is large, the airtightness between the door and the rotor chamber becomes insufficient, and in the unlikely event that the rotor is damaged in the rotor chamber, a problem arises in that debris pops out from the gap in the door ..

The object of the present invention is to solve these problems.

[0009]

[Means for Solving the Problems]

 In order to eliminate the gap between the door and the rotor chamber, increase the airtightness inside the rotor chamber, and ensure safety, the claw of the locking device should be caught on the hook of the door when the door is pressed against the rotor chamber. In order to open the door easily to take out the sample after centrifuging by adopting the conventional A-type structure, the lock device is released by the rotor stop signal and the I made it possible to open the door.

Then, it is detected that the door is opened, the open / closed state of the door is recognized from the signal, and the door is locked immediately when the door is closed thereafter.

[0011]

[Action]

 The centrifuge configured as described above releases the door lock device by the rotation stop signal of the rotor (or motor), detects that the door has been opened by the door open / close detection sensor, and then closes the door. It works to lock if asked.

[0012]

【Example】

 Examples will be described below.

FIG. 1 is a timing chart showing the operation of the door lock device of the present invention, and FIG. 2 is a flow chart. FIG. 3 shows an embodiment of the door lock device.

When the rotor (or motor) is rotating, the solenoid 22 is turned off, and the spring 25 pulls the claw 21. The hook 21 attached to the door 1 is caught by the claw 21 and the door 1 is locked (steps 30 and 31). When the rotation of the rotor (or motor) is stopped, a rotation stop signal is output (step 32). The solenoid 22 is turned on by the rotation stop signal (step 33).

The claw 21 connected to the solenoid 22 with the connecting pin 24 moves around the fulcrum 23, and is disengaged from the hook 11 to unlock the door. In this state, the door 1 can be opened at any time. When the door 1 is opened, the door open / close detection sensor 26 outputs a door open signal. If the door 1 remains open, the solenoid 22 remains ON (step 34). After that, when the door 1 is closed, the hook 11 operates the door opening / closing detection sensor 26 and outputs a door closing signal (step 35). The solenoid 22 is turned off by the door closing signal, the hook 21 is caught by the hook 11, and the door 1 is locked. Then, after the door 1 is locked, in order to open the door 1, the door 22 can be opened all the time by pressing the door unlocking switch to turn on the solenoid 22 and unlocking the door.

Further, as shown in FIG. 5, the object of the present invention can also be achieved by a structure in which the door opening / closing sensor 26 detects when the door 1 is opened and the solenoid 22 is locked, that is, turned off. .. In this case, when the door 1 is closed, the door 1 is locked by the action of the slope 25 provided on the upper portion of the claw 21 and the spring 25.

[0017]

[Effect of the device]

 According to the present invention, when the rotation is stopped, the door locking device is released so that the door can be opened at any time. Then, when the door is opened and the door is closed afterwards, the door is locked immediately, eliminating the gap between the door and the rotor chamber and improving the airtightness of the rotor chamber. It is possible to ensure safety.

[Brief description of drawings]

FIG. 1 is a timing chart of a door lock device of a centrifuge according to the present invention.

FIG. 2 is a flowchart showing the operation of the door lock mechanism of the present invention.

FIG. 3 is a sectional view showing an embodiment of the door lock mechanism of the present invention.

FIG. 4 is a timing chart showing the operation of a conventional door lock mechanism.

FIG. 5 is a timing chart showing another embodiment of the operation of the door lock mechanism of the present invention.

[Explanation of symbols]

 1 Door 11 Hook 2 Door Lock Device 21 Claw 22 Solenoid 23 Support Point 24 Connecting Pin 25 Spring 26 Door Open / Close Detection Sensor

Claims (1)

[Scope of utility model registration request] 1. A centrifuge having a rotor for loading a sample to be centrifuged, a rotor chamber for housing the rotor and opened / closed by a door, and a motor for driving the rotor, wherein the motor or the rotor is A door lock mechanism for a centrifuge, characterized in that the door lock mechanism is controlled by a rotation stop signal output when the door is stopped and a signal from a door opening / closing detection sensor driven by the operation of the door.