RU2471541C1 - Explosive compound components mixer - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention may be used as pre-mixer of explosives and other chemicals. It comprises cylindrical case consisting of two half-cases, rotor with vanes shaped to triangular prisms. Said rotor is equipped with drive. Top half-case outlet is stopped by band wall while that of bottom half-case is provided with shutter provided with pneumatic drive. The latter has end position pickups. Shutter stroke and position of shutter control pickup can be adjusted. Said shutter is coated by polymer material, for example, polyurethane.

EFFECT: sufficient tightness, ruled out dusting.

4 dwg

Description

The invention relates to the field of mixing explosive compositions, including gunpowder and solid rocket fuels, and can be applied in other chemical industries.

For mixing explosive compositions, it is possible to use mixers containing a detachable cylindrical body, consisting of two articulated halves and a rotor with blades in the form of triangular prisms.

The well-known mixer SPO-3000 (preliminary, single-shaft mixer) for preliminary mixing of powdery and liquid-viscous components, including fire and explosive mixtures (see "Information leaflet on scientific and technological achievement" No. 92-1119, VNIMI, Moscow, 1992 .). The mixer includes a cylindrical body, a rotor equipped with triangular blades. An elastic retaining membrane is installed at the outlet of the cylindrical body.

The disadvantage of this device is that with constant exposure to the membrane of the processed composition, as well as with periodic washing, the membrane is deformed and does not provide the necessary sealing of the outlet of the casing when the rotation of the rotor is stopped, and also does not exclude the passage of wetted powder to the outside (dusting) at the outlet of the mixer, which is unacceptable.

This disadvantage is excluded in the device according to the patent of the Russian Federation No. 2157277, IPC B01F 7/02, C06B 21/00, decl. 09.16.1999, publ. 10.10.2000 taken as a prototype. In this device, the elastic membrane is equipped with a rigid frame in the upper part and a device for ensuring its constant pressing against the housing during operation and its removal before opening the housing. In addition, there is an additional device for periodically pressing the elastic membrane to the lower half of the body. This device has a pneumatic actuator with end position sensors.

The disadvantage of the prototype is that the elastic membrane, tightened in the upper half of the housing, does not allow to open the housing remotely at the end of work. Before disassembling, it is necessary to go into the working cabin of the mixer and manually open the clamp, which, if there is an explosive product in the mixer, is a dangerous operation. In addition, the opening size of the outlet of the housing is not adjustable, which does not allow to optimally conduct the process in a wide range of compositions for viscosity.

The technical problem to which the invention is directed is to simplify the design and ensure optimal operation in a wide range of viscosities of processed compounds, as well as improving the safety of the mixing process.

The technical result is achieved in that the mixer comprises a cylindrical housing consisting of two articulated half-bodies with an outlet, a rotor with blades in the form of triangular prisms with a rotor drive, the outlet of the upper half-body is closed by a blind wall, and the outlet of the lower half-body is equipped with a pneumatic damper for remote closing of the outlet. The pneumatic actuator is equipped with end position sensors, moreover, the value of the valve stroke and the corresponding position of the sensor controlling the opening of the valve are made adjustable, and the valve is covered with an elastic polymer composition, for example polyurethane.

The proposed device is shown in figures 1-4.

Figure 1 shows a longitudinal section of a mixer.

Figure 2 shows the cross section of the mixer in the discharge zone.

Figure 3 shows the pneumatic damper assembly in the closed position.

Figure 4 shows the pneumatic damper assembly in the open position.

1 - upper half-shell;

2 - lower half-shell;

3 - rotor;

4 - blades;

5 - blind wall;

6 - shutter;

7 - loading hatch;

8 - unloading estrus;

9 - fingers;

10, 11 - end position sensors;

12 - strip;

13 - emphasis;

14 - ring;

15 - pneumatic drive;

16 - drive.

The mixer consists of a cylindrical body made of two hingedly connected half-shells - the upper half-shell 1 and the lower half-shell 2 (Fig. 1) with an outlet in the lower half-shell 2. The mixer also contains a rotor 3 with blades 4 in the form of triangular prisms angled to the outlet hole. The rotor is equipped with a drive 16. Fingers 9 are installed in the lower half-housing 2. The outlet half of the upper half-housing 1 is blocked by a blind wall 5. The lower half-housing 2 is equipped with a shutter 6 covered with an elastic polymer material, for example polyurethane. The damper has a pneumatic actuator 15 equipped with end position sensors 10 and 11.

For stiffness, the shutter 6 has a metal frame, and a polymer coating eliminates the possibility of metal-metal collision. The magnitude of the stroke "b" (Fig. 3) of opening the shutter is adjusted by installing the corresponding ring 14. At the same time, the position of the sensor 11 is adjusted by moving it on the bar 12. In this case, the stroke "a" of the stop 13 before the sensor 11 is activated must be equal to the value of the stroke "b" opening the shutter 6. For loading components into the mixer for mixing, there is a loading hatch 7. The mixture is unloaded through the discharge chute 8.

The mixer is as follows.

Assembled, the outlet (Figs. 1 and 3) is closed by a shutter 6. The components to be mixed are fed into the loading hatch 7. Mixing the composition is carried out by the blades 4 of the rotating rotor 3, which interact with the fingers 9, mounted in the lower half-housing 2. The triangular shape of the rotor blades and the location of the blades on the rotor provide movement of the composition to the outlet. The presence of a blind wall 5 in the upper half-housing 1 eliminates dusting of the powder at the outlet of the mixer. First, with the shutter 6 closed and with the rotor 3 operating, the entire working volume of the mixer is filled. Then the supply of components is stopped, the composition is mixed. After a specified time, the flow of components is turned on again, the shutter 6 opens (Figure 4). The magnitude of the stroke of the shutter when opening is determined empirically, depending on the viscosity of the processed composition and should provide free exit of the mixed composition, but at the same time not to allow excessive emptying of the mixer.

At the end of the mixing process, the drive 16 of the rotor 3 is turned off. The output opening of the lower half-shell 2 is automatically blocked by the shutter 6 to prevent the composition from draining and emptying the mixer.

A prototype of the device was tested with positive results at the Perm Perm Powder Plant.

Claims (1)

A mixer for mixing explosive components comprising a cylindrical body consisting of two articulated half-bodies with an outlet, a rotor with vanes in the form of triangular prisms, a rotor drive, characterized in that the outlet opening of the upper half-housing is closed by a blind wall and the outlet opening of the lower half-housing is provided the pneumatic actuator damper, while the pneumatic actuator is equipped with end position sensors, and the valve stroke size and the position of the sensor controlling the open position are closed ki, are adjustable, wherein the valve is coated with resilient polymer material such as polyurethane.

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