SU738678A1 - Device for interlocking the hatch cover of centrifugal apparatus - Google Patents

Description

(54) DEVICE FOR LOCKING THE HATCH OF THE CENTRIFUGE

one

The invention relates to centrifuge protection devices and can be used in various industries, in particular in the production of cellulose triacetate in the chemical-photographic industry. The proposed device is designed to protect against premature loading and unloading hatches of centrifuges until the rotor stops completely.

Known devices for loading and unloading manholes of centrifuges are made in the form of spring-loaded handles, which are opened by the force of a hand operating at any time f 1.

There are known devices for locking centrifuge shakers, including snap-fit lock elements mounted on a carrier frame. In addition, there is a 1Й swivel locking element, which rotates around an axis and occupies two positions, in one. Of the koiopbix, the locking element prevents the opening of the cover {2.

Known devices have the following significant drawbacks.

1. The complexity of the constructive implementation of the locking mechanism.

2. The sensitivity of the mechanism to the change in the number of revolutions of the centrifuge rotor is low, and the reliability of the device is low, in the case when the rotor of a centrifuge with a large rest mass does not stop due to inertia.

It is also known a device for locking the centrifuge's hatch, comprising a slider mounted on the centrifuge body with subfuginer

10 locking rod, locking locking rod, pusher and sensor that reacts to the rotation of the rotor 3.

However, this is structurally difficult to manufacture, and also does not provide sufficient

15 reliable locking of the centrifuge's hatch, since at very low rotor speeds the sensor can turn off the drive and thereby unlock the hatch of the centrifuge.

The purpose of the present invention.

20 is a new security lock.

The goal is achieved by the fact that the known device is equipped with an electromagnetic coil, the bark of which serves as a pusher. and a counter voltage system at the terminals of the electric motor of the centrifuge 1, which includes series-connected form-suppressor-limiter, amplifier, and intermediate p (or, the normally-open contacts of which are connected to the electromagnetic coil connected to the centrifuge motor. Fig. 1 shows the device described in Fig. 2 - its block diagram is shown. A device for locking the centrifuge's hatch (Fig. 1) includes a slider 2, b, ukrepleyny on the centrifuge case locking rod 3 with spring 4 and locking rod 5 of the locking rod, which is included in the gripping of the heater with a slider 2. The locking control means is made in the form of a push rod b, which is simultaneously the core of the electro magnetic coil 7, and the voltage control system at the motor terminals 8 centrifuges (FIG. 2. The control system includes a driver - a limiter 9, which is connected to the phase supply wire (for example, phase C) through a normally closed contact 10 of the intermediate relay 11, the winding of which is also connected to the terminal e powered motor. The output of the driver - limiter 9 is connected to the input of the DC amplifier 12 {Stifj For powering UPT by serving-Schönych-W: that current 13. The output of DC amplifier 12 is connected to the winding of the intermediate relay 14, having a normally open contact 15, parallel to which the normally open contact 16 of the intermediate relay 11 is turned on. Through the contacts 15 and 16 the DC source 13 is connected; with electromagnetic coil 7. The centrifugal electric motor 8 is connected to the AC mains through the contact device 17. The device operates as follows: zbm. When the contact device 17 is turned on, the centrifugal motor is started up and simultaneously recorded: winding. Intermediate relay 11. Normally open contact 16 of the intermediate relay And closes the power supply circuit of the electromagnetic coil from the DC source 13. The pusher 6, which serves as the electric coil | 50 coil 7, moves inward of the coil, engaging the BOKpjo axis and turning its associated locking latch 5, the rod. The latch moves (to the left in FIG. 1) slider 2 and the locking rod 3 associated with it. At the same time, the spring 4 is compressed, see the stroke of the slider 2 at the same time. Shifting to the far left position, the locking rod 3 will block the hatch of cheshrif) pgi . Terminal closed contact 10 intermediate. relay And disconnects the rest of the device. When electric motor B is disconnected to a full stop (being asynchronous, it operates in generator mode), the induced EMF is smaller, intermediate relay 11 does not work, and m Normally-Limiter 9 is supplied via normally closed contact 10, from which the command signal of a certain amplitude and frequency comes at. DC amplifier 12 until the motor is completely stopped. In turn, the DC amplifier 12 is powered from the DC source 13 and upon receipt of a signal from the driver - limiter 9 feeds the coil of the intermediate relay 14, which with its normally open 15 contact closes the power supply circuit with the DC source 7 13. The locking mechanism works as in the previous case. When the centrifuge rotor is completely stopped, the voltage at the terminals of the motor will disappear and intermediate relay 14 will be de-energized. At the same time, its contacts 15 are open and break the power circuit. electromagnetic coil 7, as a result of which the spring 4 transfers the locking rod 3 to the right (Fig. 1) and opens the hatch of the centrifuge, after which it can be opened freely. The presence of a control circuit for the absence of voltage at the terminals of the drive motor, a centrifuge, allows to increase the efficiency of blocking the hatch and thereby exclude the possibility of its opening until the centrifuge rotor stops completely. The present invention is directed to the complete elimination of injuries among service personnel associated with the premature opening of loading and unloading hatches of medium and heavy centrifuges. Formula and 3 modems A device for locking the centrifuge's hatch, containing a slide mounted on the centrifuge housing with a spring-loaded locking rod, a locking locking rod and a Pusher, characterized in that it is equipped with an electromagnetic lock to increase the locking reliability pusher, and the control system of the nut tension value at the terminals of the centrifuge motor, including. serially connected shaper limiter, amplifier and intermediate relay, normally open the contacts of which are connected to the electromagnetic coil connected to the contact device used to turn off the electric motor / centrifuge.

5738678 .6

Sources of information, 2. U.S. Patent No. 3,866,825, clause В04В 7/06,

taken into account in the examination of the public. 1975.

1. Industrial centrifuges, catalog-3. France Patent N "2258899,101.8 04 B 7/06,

reference book TSINTIHIMNEFTEMA, M., 1966. pub.1975.

Claims (1)

Claim A device for locking the centrifuge hatch, comprising a slider mounted on the centrifuge body with a spring-loaded locking rod, a locking rod latch and a pusher, in order to increase the reliability of the lock, it is equipped with an electromagnetic coil, the anchor of which is the pusher, and a control system the voltage at the terminals of the centrifuge motor, including. serially connected shaper limiter, amplifier and intermediate relay, normally open contacts of which are connected to an electromagnetic coil connected to a contact device serving to turn off the electric motor, centrifuge. ------- and- "In