UA80482C2 - Hydro-drive of cylinder-roller mill - Google Patents

Abstract

A hydro-drive of cylinder-roller mill includes hydro-cylinders of displacement drive of milling roller, those form working force, and hydro-lines connecting rod and piston cavities of hydro-cylinders. To chain of hydro-line connecting rod cavities pipeline is included, this connects hydro-pneumatic accumulator to it, at that the pipeline is equipped with two-line distributor, analog pressure indicator and throttle, and to chain of hydro-line connecting piston cavities pipeline is included, this connects the second hydro-pneumatic accumulator to it, and pipeline itself is equipped with two-linear distributor, analog pressure sensor, pressure valve and compensation tank. The invention promotes provision of stable working force and protection of elements of mill against breaking at not-milled bodies passage.

Description

Description of the invention

The invention relates to the field of mechanical engineering, more precisely to hydraulic devices and can be used to create reliable hydraulic drives of mills of a new type.

The hydraulic drive of the crusher is known, which is used to move the working bodies in order to protect the crusher from damage to the working bodies when unbreakable objects fall into the crusher. This hydraulic drive includes a hydraulic cylinder to adjust the distance (output gap) between the working bodies of the crusher. The piston and rod cavities of the cylinder are connected by hydraulic lines with throttling devices, 70 equipped with hydraulic accumulators | see, for example, the prospectus of the Radomir plant, Bulgaria, "Crushers for crushing iron ore", 1983.1.

The disadvantage of this safety device is the complexity of the design, which is due to the presence of a significant number of hydraulic accumulators. This is the reason for the decrease in the reliability of the device, as there are cases of damage to the pneumatic chambers of hydraulic accumulators when the working fluid is quickly returned to the hydraulic cylinder. 12 The hydraulic drive of the crusher is also known, which contains a hydraulic cylinder for moving the movable cone of the crusher in order to control the size of the output gap between the working bodies of the crusher, connected by hydraulic lines to hydropneumoaccumulators and their control units | see patent of Ukraine Mo33582 "Shock absorber", according to Mkl.

E15C15/22).

Hydraulic accumulators for receiving a significant volume of working fluid and quickly returning it to the hydraulic cylinder have pneumatic chambers filled with inert gas, which is compressed by the working fluid when the pressure in the cylinder is higher than the working pressure limit, to which the safety valves of the pipeline line are set.

According to the set of essential features, the above-mentioned hydraulic drive of the crusher is closest to the declared one and can be taken as a prototype. This design of the hydraulic drive makes it possible to protect the elements of the crusher from breaking during the passage of uncrushable bodies of the predicted size. with

For a drum-roll mill, in addition to protecting its elements from breaking when uncrushable bodies pass through, (9) there are additional requirements for ensuring a stable working force on the roll and maintaining a constant gap between the roll and the drum. The prototype does not meet these requirements.

The basis of the invention is the task of creating a hydraulic drive of a drum-roll mill with the following functions: сч - ensuring a stable working force; c - maintenance of the specified gap between the roll and the drum - protection of the mill elements from breaking when unbreakable bodies pass through. M

This problem is solved due to the technical result, which consists in the fact that the hydraulic drive of the drum-roll mill is made with the possibility of determining the amount of the working force of grinding, 39 the size of the gap between the roll and the drum, and with the possibility of quickly dumping the working fluid from the rod cavities and supplying it into the piston cavities.

To achieve this technical result in the hydraulic drive of the drum-roll mill, which includes the hydraulic cylinders that create the working force of the drive for moving the grinding roll and the hydraulic lines that connect "the rod and piston cavities of the hydraulic cylinders, in the chain of the hydraulic line that connects the rod cavities" is included Z 50 a pipeline connecting a hydropneumatic accumulator with it, while the pipeline is equipped with a two-line distributor, an analog pressure sensor and a throttle, and a pipeline connecting a second hydropneumatic accumulator is included in the circuit of the hydraulic line connecting the piston cavities , and the pipeline itself is equipped with a two-line distributor, an analog pressure sensor, a pressure valve and a compensation tank. In addition, the hydraulic drive of the drum-roll mill is equipped with a linear displacement sensor connected to the two-line distributor of the hydraulic line of the piston cavities of the hydraulic cylinders. Because between the outstanding features of the invention and the technical result there is a cause-and-effect relationship. av! For t so that the hydraulic drive of the drum-roll mill provides the possibility of determining the amount of work effort - crushing, the amount of the gap between the roll and the drum, and has the ability to quickly discharge the working fluid from the rod cavities and feed it into the piston cavities of the hydraulic cylinders, in it into a chain of 20 hydraulic lines, which connects the rod cavities, a pipeline connecting the hydropneumatic accumulator with it is included, while the pipeline is equipped with a two-line distributor, an analog pressure sensor and a throttle, and a pipeline connecting the piston cavities is included in the circuit from the hydraulic line connecting the piston cavities with it is a second hydro-pneumatic accumulator, and the pipeline itself is equipped with a two-line distributor, an analog pressure sensor, a pressure valve and a compensation tank. In addition, the hydraulic drive of the mill is equipped with a sensor of linear 29 movements connected to a two-line distributor of the hydraulic line of the piston cavities of the hydraulic cylinders.

GF) Such a technical result cannot be obtained if any of the given set of features is excluded. A check of the scientific and technical and patent literature showed that there is no description of the hydraulic drive of the mill with such features, and this allows us to conclude that the solution is new.

The claimed solution is inventive because it is not obvious to a person skilled in the art at level 60.

The invention is industrially suitable, and the design of the hydraulic drive of the MBV-2 4 mill has been developed at JSC NKMZ.

The essence of the invention is explained by the drawings, where: Fig. 1 shows a kinematic diagram of a drum-roll mill; Fig. 2 shows a section along A-A (arrow "n" shows the direction of rotation of the drum of the mill); because Fig. 3 shows the diagram of the hydraulic drive of the mill;

The drum-roll mill (see Figs. 1 and 2) includes a drum 1 mounted on support rollers 2 fixed to a foundation 3. Drum 1 rotates around a horizontal axis with its drive (drum drive not shown) at a supercritical speed. Inside the drum 1, in its lower part, a grinding roller 4 is placed. The roller 4 is mounted on an axis 5 through bearings, which rests on the hydraulic cylinders 6 of the hydraulic drive of the mill, fixed on the foundation 3.

The hydraulic drive of the drum-roller mill (see Fig. 3) includes the hydraulic cylinder 6 that creates the working force of the drive to move the grinding roll 4, the hydraulic line 7 connecting the rod cavities of the hydraulic cylinders, as well as the hydraulic line 8 connecting the piston cavities of the hydraulic cylinders 6. A pipeline 9, 70 is included in the circuit of hydraulic line 7, which connects to it a hydropneumatic accumulator 10. Pipeline U is equipped with a two-line distributor 11, an analog pressure sensor 12 and a throttle 13.

A pipeline 14 is included in the circuit of hydraulic line 8, connecting to it a hydropneumatic accumulator 15. Pipeline 14 is equipped with a two-line distributor 16, an analog pressure sensor 17, a pressure valve 18 and a compensation tank 19. In addition, the hydraulic drive of the mill is equipped with a sensor of linear movements 20, connected connected with a two-line distributor 16.

To fill the hydropneumatic accumulators 10 and 15 with an inert gas (for example, nitrogen), a pneumatic line 21 with sensors 22 and 23 is provided, which maintain in them and in the pipeline line 9, 14 the working pressure "P", and in the hydropneumatic accumulator 15 - the control pressure "P-- 596".

The declared hydraulic drive of the drum-roll mill works as follows.

Using pumps 24, the working fluid is fed through the pipeline 25 into the rod cavities of the hydraulic cylinders 6, where the working pressure "P" is created, which is sufficient for crushing the material, while maintaining the specified distance between the roll 4 and the drum 1. At the same time, the hydro-pneumatic accumulators 10 and 15 are filled through the pneumatic line 21 inert gas under pressure "P".

When an unbreakable object, for example, a tooth from an excavator bucket, enters the mill, the specified distance between the roll c ge and the drum 1 is forcibly increased, the working fluid is displaced from the rod cavities of the hydraulic cylinders b through the pipeline 9 into the hydropneumatic accumulator 10, compressing the gas. The lack of working fluid in the piston cavities of i) hydraulic cylinders 6 is replenished due to rarefaction in the pipeline 14, which connects the piston cavities of the hydraulic cylinders with the compensation tank 19. The working fluid from the tank 19 through the pressure valve 18 of the piston cavities of the hydraulic cylinders 6, filling the vacuum. с зо After passing the unbreakable object, the compressed gas returns the working fluid to the rod cavities of the hydraulic cylinders 6 and the distance between the roll 4 and the drum 1 is restored for normal operation. Excess working fluid is discharged through the pressure valve 18 into the tank 19 and the pressure necessary for normal operation is restored in the piston cavities of the hydraulic cylinders.

The size of the gap between the roll 4 and the drum 1 is set with the help of two-line distributors 11 and o 16 by turning on the corresponding electromagnets 26 / 27 (see Fig. 3) to raise or lower the roll 4. After the electromagnets 26 / 27 are turned off, hydraulic closing of the hydraulic cylinder system occurs. pipelines

Further maintenance of the working gap between roller 4 and drum 1 proceeds automatically.

When the gap between the roll 4 and the drum 1 changes, which is caused by inevitable leaks in hydraulic systems, the linear displacement sensor 20 gives a signal to turn on the solenoid of the two-line distributor 16. The working fluid from the hydro-pneumatic accumulator 15 through the distributor 16 enters the piston cavities of the hydraulic cylinders b i) s the distance between roll 4 and drum 1 is restored to normal operation. When roller 4 reaches the working state, the sensor of linear movements 20 gives a signal to turn off the electromagnet of the distributor 16. Roller 4;" stops

Thus, the declared design of the hydraulic drive of the drum-roll mill is capable of ensuring the following functions: o - ensuring a stable working force; - maintenance of the given gap between the roller and the drum; o - protection of the mill elements from breaking during the passage of unbreakable bodies. All this provides the mill with high consumer characteristics and competitiveness. at 50

Claims (2)

The formula of the invention Co.) 1. The hydraulic drive of the drum-roll mill, which includes the hydraulic cylinders of the drive for moving the grinding roll, which create the working force, and the hydraulic lines connecting the rod and piston cavities of the hydraulic cylinders, which is distinguished by the fact that the chain of the hydraulic line, which connects the rod cavities, the pipeline that (F) connects the hydropneumoaccumulator with it is included, while the pipeline is equipped with a two-line distributor, a GI analog pressure sensor and a throttle, and the pipeline that connects the second hydropneumoaccumulator, and the pipeline itself is equipped with a two-line distributor, an analog pressure sensor, a pressure valve and a compensation tank. 2. The hydraulic drive of the drum-roll mill according to claim 1, which is distinguished by the fact that it is equipped with a sensor of linear movements connected to a two-line distributor of the hydraulic line of the piston cavities of the hydraulic cylinders. b5