RU2336406C2 - Method of distribution of liquid for hydraulic control of mechanisms of pit boring rig - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention refers to the hydraulic actuation mechanism of the pit boring rig, intended for drilling blast boreholes in rocks. The technical result is reached by means of the controlled and safety built-in valves collected in a single unit. Liquid is distributed by three small-sized similar three-dimensional units with electro-hydraulic control, hydraulic impacts and substantial leaks being excluded.

EFFECT: increased performance of the pit boring rig.

1 dwg

Description

The invention relates to a hydraulic drive of a quarry drilling machine designed for drilling blast holes in rocks with varying physical properties.

In a hydraulic drive of a quarry drilling machine (USSR author's certificate No. 341110, class E21s 1 / 100.1967; Operating manual for a drilling rig SBSh 250 MNA-32 Section: Hydraulic drive of a machine. Maslostantion 091-02.69,0000-02, Production of Rudgoromash OJSC Voronezh) a spool type fluid distribution was used to control the mechanism for supplying the drill string and supplying it to the hydraulic control units for supporting auxiliary operations using 1 P 203 directional control valves (IP 203 RE Hydroapparat Ulyanovsk). Overload protection is carried out by a hydraulic safety valve with a set pressure necessary for the operation of auxiliary mechanisms. The drilling process is conducted with remote control of this valve.

The disadvantage of this hydraulic actuator is the low throughput of the hydraulic lines of the control valves and pipelines that do not provide the required shunting speeds of the drill string, amounting to 15 meters per minute, as well as the complexity of the design of the oil station with low maintainability.

For used feed hydraulic cylinders with a piston diameter of 280 mm, a rod diameter of 180 mm, and a maximum piston stroke of 2420 mm, designed to drive a drill stand using a four-wire rope-polypaste system, a fluid flow rate of 460 liters per minute is required .

An analogue of the invention is a hydraulic actuator described in the operating manual for a quarry drilling rig SBSh-250MNA-32. Section: Hydraulic drive of the machine. Valve distributor 091-02.78.0700. TU 3541-100-0002 11044-93. Production of OJSC Rudgormash, Voronezh, put into operation in the quarries of OJSC Stoilensky GOK, Stary Oskol, Belgorod Region and OAO Mikhailovsky GOK, Zheleznogorsk, Kursk Region in 2003-2004 and based on valve-spool type fluid distribution. With the help of four different types of hydraulically controlled valves, the required shunting speeds of the drill string movement, the drainage of fluid to the drain, as well as the supply of fluid to the hydraulic control units of the auxiliary mechanisms are carried out. The drilling process is carried out with the connection of hydraulic valves BE 10 (BE 10 RE "Gidroapparat" Ulyanovsk). The hydraulic system is protected from overloads by two safety valves - a general one, installed in the pressure line of the hydraulic pump for the pressure necessary for operation of the auxiliary mechanisms, and a safety valve, installed in the hydraulic line of the piston cavities of the supply hydraulic cylinders, to ensure the drilling process with the required pressure.

The disadvantage of this method of fluid distribution is the presence of powerful hydraulic shocks when the hydraulic actuator is turned off, which must be suppressed by the selection of a controlled damper valve built into the shut-off valve, through which fluid is also throttled under high pressure, leading to instability of the drilling process and heating of the fluid, as well as structural complexity with low maintainability.

The disadvantage of both methods of distribution is the lack of protection against overloading the rod cavities of the supply hydraulic cylinders and their cable-polypaste system, which require setting the pressure of the safety valve half as much as the pressure in the common line.

SUMMARY OF THE INVENTION

The essence of the invention lies in obtaining a technical solution for a method of distributing a liquid, which provides

1 - the necessary fluid flow rate to ensure the required speed characteristics of the movement of the drill stand;

2 - protection of all mechanisms against overloads, requiring various settings of pressure limits;

3 - protection of the hydraulic system against water hammer;

4 - uniformity (uniformity) of hydraulic distribution devices with a distribution function and protection against ultimate loads.

The aim of the invention is to improve the operational characteristics of the quarry drilling rig.

This goal is achieved using the claimed method of fluid distribution for hydraulic control of the mechanisms of a quarry drilling rig using a three-line block valve distribution with the protection of the external hydraulic line from overloads and hydraulic shocks, different from those known in that the hydraulic mechanisms are controlled by three blocks (1), each of which includes controlled (2) and safety (3) valves with a normally open type pilot and throttle plate (6), etc. why during the “Drilling” operation, the controlled valves of the rod cavities of the hydraulic cylinders (7) and the hydraulic units of auxiliary operations (4, 5), as well as the safety valve of the piston cavities of the hydraulic cylinders, will correspond to the setting of the safety valve spring, and the liquid will be drained from the rod cavities of the hydraulic cylinders through its own safety valve valve, during the “Quick Descent” operation, the controlled valves of the rod and piston cavities of the hydraulic cylinders are opened, and the safety valves are closed t and with the closed controlled valve of the auxiliary unit hydraulic units, the liquid displaced from the rod cavities of the hydraulic cylinders enters the hydraulic line of the piston cavities together with the fluid supplied by the pump, during the operation "Lifting the drill stand", the controlled valves of the piston cavities of the hydraulic cylinders and hydraulic units of auxiliary operations, as well as the safety valve the valve of the rod cavities of the hydraulic cylinders is closed, the liquid displaced from the piston cavities is drained into the tank through its own open fuse a valve, and the pressure created in the hydraulic line of the rod cavities of the hydraulic cylinders will correspond to the setting of the spring of its own safety valve, when any of the auxiliary operations is turned on, the controlled valves of both cavities of the hydraulic supply cylinders are closed, and the liquid supplied by the pump flows to the hydraulic units of the auxiliary mechanisms through an open controlled valve , while the pressure in the hydraulic line will correspond to the setting of the spring of its own safety valve, closed at for prison this operation.

OBTAINED TECHNICAL RESULT

- Alternately, the safety valve performs distribution functions with the required fluid flow rate, and protects the external hydraulic line from overloads with the required limit pressure setting;

- Lack of hydroblows in a hydraulic system at shutdowns;

- The uniformity of the hydraulic units used.

SCROLL

The drawing shows a method of distributing fluid for hydraulic control of the mechanisms of a quarry drilling rig.

1. Distribution valve body;

2. Pluggable plug-in valve of normally open type with pilot control. An analogue of a controlled valve damn. No. 091-02.76.0100 manufactured by Rudgormash, Voronezh;

3. The plug-in safety valve of normally open type with control pilot MKPV 25 / 3FZPZ; Production GSKTB GA, Gomel, Republic of Belarus;

4. The valve body of the mast 091-59.50.0000;

5. The valve body of the engine room 091-02.48.0000;

6. Throttle plate D1FSB. IP203 RE Hydroapparat Ulyanovsk;

7. The hydraulic cylinder feed the drill stave with a volume ratio of piston and rod cavities 2: 1.

METHOD FOR DISTRIBUTING LIQUID FOR HYDRAULIC CONTROL OF MECHANISMS OF A QUARRY DRILLING MACHINE. WORK DESCRIPTION

The fluid flow supplied by the pump (see drawing) enters the hydraulic units 1, which have the same set of hydraulic units and through controlled valves of the normally open type 2, overcoming the force of the springs, flows through the hydraulic lines into the piston and rod cavities of the hydraulic cylinders for feeding the drill stand 7, hydroblocks 4 and 5 control auxiliary mechanisms and through normally open safety valves 3 is discharged into the tank. When the pump is turned off, all the hydraulic lines of the mechanisms are filled with liquid, which contributes to the quick response of the mechanisms. Closing and opening of all valves is carried out by control pilot electromagnets.

When performing the “Drilling” operation, the controlled valves of the rod cavities of the supply hydraulic cylinders and the auxiliary hydraulic unit, as well as the safety valve of the piston cavities of the hydraulic cylinders are closed. At this pressure, the piston cavity hydraulic line will correspond to the setting of the safety valve spring. Liquid is drained from the rod cavities of hydraulic cylinders through its own safety valve.

During the “Quick Descent” operation, the controlled valves of the rod and piston cavities of the hydraulic cylinders are open, and the safety valves are closed and with the closed controlled valve of the hydraulic unit of auxiliary operations, the liquid displaced from the rod cavities of the hydraulic cylinders enters the hydraulic line of the piston cavities together with the liquid supplied by the pump. When the ratio of the volume of the piston and rod cavities is 2: 1, the differential connection of the hydraulic cylinders allows you to have equal speeds of the pistons of the hydraulic cylinders in both directions.

When the operation "Lifting the drill stand" is switched on, the controlled valves of the piston cavities of the hydraulic cylinders and hydraulic units of auxiliary operations, as well as the safety valve of the rod cavities of the hydraulic cylinders are closed. The fluid displaced from the piston cavities is discharged into the tank through its own open safety valve. The pressure generated in the stem cavity hydraulic line will correspond to the spring setting of its own safety valve.

When any of the auxiliary operations is switched on, the controlled valves of both cavities of the supply hydraulic cylinders are closed. The fluid supplied by the pump enters the hydraulic units of the auxiliary mechanisms through an open, controlled valve. In this case, the pressure in the hydraulic line will correspond to the setting of the spring of its own safety valve, which closes when this operation is turned on.

Throttle plates 6 with a built-in adjustable throttle and check valve provide quick closing of controlled valves and an adjustable response time for their opening with the exception of water hammer when the hydraulic actuator is turned off.

Claims (1)

A method for distributing fluid for hydraulic control of the mechanisms of a quarry drilling rig using a three-linear block valve distribution with protection of the external hydraulic line from overloads and hydraulic shocks, characterized in that the hydraulic mechanisms are controlled by three blocks, each of which includes a controlled and a safety valve with control pilots of a normally open type and a throttle plate, moreover, when performing the “Drilling” operation, the controlled valves of the rod cavities are the hydraulic cylinder c and hydraulic units of auxiliary operations, as well as the safety valve of the piston cavities of the hydraulic cylinders will correspond to the setting of the spring of the safety valve, and the liquid is drained from the rod cavities of the hydraulic cylinders through its own safety valve, during the “Quick Release” operation, the controlled valves of the rod and piston cavities of the hydraulic cylinders are opened, and safety valves close and when the controlled valve of the auxiliary unit of the auxiliary operations is closed, the liquid is displaced I, from the rod cavities of the hydraulic cylinders, enters the hydraulic line of the piston cavities together with the fluid supplied by the pump, during the operation “Lifting the drill stand”, the controlled valves of the piston cavities of the hydraulic cylinders and hydraulic units of auxiliary operations, as well as the safety valve of the rod cavities of the hydraulic cylinders, close the fluid displaced from the piston cavities are poured into the tank through its own open safety valve, and the pressure created in the hydraulic line of the rod cavities of the hydraulic cylinders will be correspond to the setting of the spring of its own safety valve, when any of the auxiliary operations is switched on, the controlled valves of both cavities of the supply hydraulic cylinders are closed, and the liquid supplied by the pump flows to the hydraulic units of the auxiliary mechanisms through an open controlled valve, while the pressure in the hydraulic line will correspond to the setting of the spring of its own safety valve, closed when this operation is enabled.