RU2765233C1 - Liquid weighting batcher - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to discrete-action liquid weighing batchers designed for batch dosing of viscous and pasty liquids, including polymer binders containing a powdery fire-explosive filler in their composition. The batcher can also be used in other industries where dosing of viscous liquids with weight control of the mass of the dispensed doses is required. The liquid weighing batcher consists of a hopper with a lid, which is equipped with bushings, a frame, a loading unit with a set valve, a weighing device. A bearing assembly with a shaft and a screw and a drive are installed on the lid. The drive is equipped with a traverse including two brackets with centering holes. Two hydraulic cylinders for lifting the lid are fixed on the frame, the rods of which are equipped with disk pick-up devices with protrusions in the form of truncated cones, which contact the centering holes of the brackets during lifting the lid. The auger and the sleeve of the hopper are made conical. The flange of the hopper is equipped with guide posts that interact with the cover bushings and have a length equal to the stroke of the hydraulic cylinder rod. The unloading unit consists of a valve body and a drain valve. The seat in the valve body and the drain valve are made in a vertical plane. The guide posts have a length equal to the stroke of the hydraulic cylinder rod. In the unloading unit, the seat in the valve body and the drain valve are made in a vertical plane.

EFFECT: simplification of the design in terms of mechanized remote disassembly, an increase in the accuracy of dosing, a reduction in the duration of the dosing cycle and an increase in the productivity of the dispenser.

1 cl, 1 dwg

Description

SUBSTANCE: present invention relates to weighing liquid dispensers of discrete action, and is intended for batch dosing of viscous and pasty liquids, including polymeric binders, containing in its composition a powdered fire-explosive filler. The dispenser can also be used in other industries where dosing of viscous liquids with weight control of the mass of dispensed doses is required.

Such dispensers are installed in industrial buildings where work is carried out with fire and explosion hazardous materials, so the design of the dispenser must have a special explosion-proof design. In addition, during operation, complete information is required on the number and accuracy of doses dispensed into the process flow.

The dosed liquid is a mixture of a polymeric binder with a powdered filler. Such a liquid, depending on the content of the components, has a viscosity of 10 to 200 Pa⋅s (100 to 2000 poise).

Liquid weighers are known, for example, from the Swiss company K-TRON SODER, the TENZO-M weighing company (Russia, Moscow region, Kraskovo settlement). These dispensers are designed for dispensing low viscosity liquids such as water, liquid margarine. So, for example, the K-TRON SODER company indicates that the dispenser is intended for dispensing liquids and pastes, however, in the characteristics it gives a viscosity range from 0.002 to 2 Pa⋅s (from 0.02 to 20 poise), i.e. they are also fairly low-viscosity liquids.

Known weighing dispenser for liquids according to patent No. 2282832 RF 2005 This dispenser processes liquids with a viscosity of up to 10 Pa⋅s (up to 100 poise).

The main disadvantage of the above liquid dispensers is their inoperability when it is necessary to dispense viscous and pasty liquids with a viscosity of 20 to 200 Pa⋅s (200 to 2000 poise).

Known weighing dispenser liquid according to the patent of the Russian Federation No. 2348017 G01G 13/00, 13/14. The dispenser is designed for dispensing high-viscosity and pasty liquids, including polymeric binders containing powdered fire-explosive filler. The disadvantage of the dispenser is the low safety during its disassembly after the end of the technological process for subsequent cleaning of the dispenser from the remnants of the binder.

Known weighing liquid dispenser according to RF patent No. 2411462 G01G 13/00, which is taken as a prototype. The dispenser is designed for dispensing high-viscosity and pasty liquids, including polymeric binders containing powdered fire-explosive filler. This dispenser provides for mechanized disassembly, which is carried out remotely. Mechanized disassembly for subsequent cleaning of the working parts of the dispenser from binder residues is necessary to improve the safety of the disassembly process by eliminating manual operations from this process, which is a prerequisite for the processing of polymer binders containing powdered VN.

The disadvantages of the prototype include the following: - the shut-off element of the drain valve is made in the form of a plate, which through the cross member in the form of a flat bar and rods interacts with the valve closing spring assembly, while the valve seat and the drain valve itself are made in a horizontal plane. The disadvantage of this valve is that during the issuance of a dose, a viscous liquid spreads over the entire surface of the plate, the crossbar and partially along the rods, at the junctions of the rods with the crossbar. After the dispensing of the dose is stopped, already with the valve closed, the viscous liquid continues to drain from these surfaces for a long time, making it difficult for the final formation of the dose, increasing the dosing error, increasing the dosing cycle and reducing the productivity of the dispenser;

- the complexity of the design of the dispenser in terms of mechanized disassembly. Extraction of the auger from the bunker for their subsequent cleaning from the remnants of the processed product is mechanized and carried out remotely. In order to ensure coaxial extension of the auger from the bunker, guide posts are provided in the design, while the racks are used in two types. With this solution, more accurate tolerances are needed when making seats for installing mechanized disassembly units, more accurate manufacturing of the units themselves, which is generally necessary to ensure their subsequent mutual assembly during the assembly of the dispenser, because seats and mounting holes for attaching nodes are made on different assembly units.

The technical problem to be solved by the present invention is:

- increasing the accuracy of dosing, reducing the duration of the dosing cycle, increasing the productivity of the dispenser;

- simplification of the design of the dispenser in terms of mechanized disassembly.

The technical result is achieved by the fact that the weighing liquid dispenser consists of a hopper with a lid, which is equipped with bushings, a frame, a loading unit with a set valve, a weighing device. A bearing assembly with a shaft with auger and a drive are installed on the cover. The drive is equipped with a traverse, which includes two brackets with centering holes. Two hydraulic cylinders for lifting the lid are fixed on the frame, the rods of which are equipped with disk grabs with protrusions in the form of truncated cones, which contact during the lifting of the lid with the centering holes of the brackets. The auger and the sleeve of the bunker are made conical. The bunker flange is equipped with guide posts that interact with the cover bushings and have a length equal to the stroke of the hydraulic cylinder rod. The unloading assembly consists of a valve body and a drain valve. The seat in the valve body and the drain valve are made in a vertical plane.

The essence of the invention is shown in the drawing, which schematically shows the proposed dispenser.

Where: 1 - bunker;

2 - cover;

3 - frame;

4 - boot node;

5 - set valve;

6 - valve body;

7 - drain valve;

8 - weight measuring device;

9 - bearing assembly;

10 - shaft;

11 - auger;

12 - drive;

13 - traverse;

14 - bracket;

15 - hydraulic cylinder;

16 - bunker sleeve;

17 - guide post;

18 - cover sleeve;

19 - disk pickup;

20 - spring;

21 - folding bolt;

22 - bunker flange;

23 - hydraulic cylinder rod;

24 - axis;

25 - lever.

The weighing liquid dispenser consists of a hopper 1, a cover 2, a frame 3, a loading unit 4 with a set valve 5, an unloading unit consisting of a valve body 6 with a drain valve 7, a weighing device 8 in the form of strain gauges mounted on the frame 3. On the cover 2, the drive 12 is fixed, and the bearing assembly 9, which is a support for the shaft 10. An auger 11 is installed at the bottom of the shaft. centering holes are made coaxially with the rods of the hydraulic cylinders. The screw 11 and the sleeve of the hopper 16 are made conical. Guide racks 17 are fixed in the flange of the hopper 22. Cover bushings 18 are fixed in the cover 2, which, when the cover 2 is lifted, move along the guide racks 17, centering the cover 2 with all nodes and parts attached to it relative to the hopper 1. The rods of the hydraulic cylinders 23 are equipped with disk pickups 19 , which in the center have protrusions in the form of truncated cones. The spring assembly for closing the drain valve 7 is a two-arm lever that can be rotated at a certain angle relative to the axis 24. The drain valve 7 is attached to the lower arm of the lever 25, and the upper arm interacts with the spring 20.

The operation of the weighing liquid dispenser is as follows. The set valve 5 opens, and through the loading unit 4 the dosed liquid is loaded into the hopper 1 from the supply tank. The filling of the hopper is continuously monitored by strain gauges of the weighing device 8. When the required amount of liquid in the hopper 1 is reached, the liquid supply stops, the set valve 5 closes. The drive 12 is turned on, driving the shaft 10 with the auger 11 into rotation. The auger 11, rotating, pumps liquid, creating pressure on the drain valve 7. Overcoming the force of the springs 20, the drain valve 7 moves away from the seat of the valve body 6, opening the outlet of the liquid from the hopper 1. Liquid delivery is continuously controlled by strain gauges of the weighing device 8. Upon reaching the given mass of the dispensed dose, the drive is briefly reversed and then turned off. The pressure on the drain valve 7 is relieved, under the action of the springs 20 the drain valve 7 is pressed against the seat of the valve body 6. The dosing cycle is completed.

Upon completion of the technological process, it is necessary to clean the working parts of the dispenser from the remains of the polymer binder. When processing polymeric binders containing in their composition a powdered flammable and explosive filler, mechanized disassembly, carried out remotely, is a necessary requirement. The process is as follows. The hinged bolts 21 connecting the cover 2 with the flange of the hopper 22 are first unscrewed, and the loading unit 4 with the set valve 5 is also removed. are included in the centering holes of the brackets 14. Disc pickups 19 lift the traverse 13, which is connected with the drive 12, the bearing assembly 9, and the cover 2 with the shaft 10 and the auger 11. is provided with guide posts 17, along which cover bushings 18, fixed in cover 2, move. from the sleeve of the bunker, the initial clearance is not increases abruptly. The lifting is carried out until the lower end of the auger 11 rises to the upper edge of the hopper 1. After cleaning the dispenser, it is assembled, which is carried out in the reverse order.

Thus, the use of guide posts in the design of the weight dispenser of liquid, having a length equal to the stroke of the hydraulic cylinder rod, as well as an unloading unit in which the seat in the valve body and the drain valve are made in a vertical plane, makes it possible to simplify the design in terms of mechanized remote disassembly, improve accuracy dosing, reduce the duration of the dosing cycle, and increase the productivity of the dispenser.

Tests of the proposed invention in the experimental industrial conditions of JSC "NIIPM" confirmed its performance.

Claims (1)

Weighing liquid dispenser, consisting of a hopper with a lid equipped with bushings, a frame, a loading unit with a set valve, a weighing device mounted on the cover of a bearing unit with a shaft with an auger, and a drive that is equipped with a traverse, including two brackets with centering holes, while two hydraulic cylinders for lifting the lid are fixed on the frame, the rods of which are equipped with disk grabs with protrusions in the form of truncated cones, which contact during the lifting of the lid with the centering holes of the brackets, the auger and the bushing of the hopper are made conical, characterized in that the flange of the hopper is equipped with guide posts that interact with cover bushings and have a length equal to the stroke of the hydraulic cylinder rod, the unloading unit consists of a valve body and a drain valve, while the seat in the valve body and the drain valve are made in a vertical plane.

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