Valve three-linear three-position hydraulic distributor with protection of withdrawal line from overloads, its locking and damping

FIELD: machine building.

SUBSTANCE: distributor is designed for supply and withdrawal of fluid into cavity of hydraulic engine and for protecting it from overloads, for locking cavity and for maintaining suspended load, for replacing load from cavity of hydraulic engine and damping to facilitate uniform motion at any specified speed. The distributor consists of a rectangular metal case of platen mounting with bypass, supply and drain lines, of a safety valve with a pilot, of a controlled valve with a pilot and two back valves each including a bush-seat, a ball and a spring. Also a safety valve is installed into the end of the case along its lengthwise axis; the valve is equipped with two control valves and the pilot. The control valve with the pilot is installed perpendicular to lengthwise axis of the case. Notably, under-valve cavity of the safety valve is connected with a side surface of the gate of the control valve and the drain line via a channel; the supply line is connected to the under valve cavity of the control valve; the drain line is connected with the side surface of the safety valve, while the back valves are installed in withdrawal channels of drain and supply lines; the back valves shut off the channels pressure tight from overflows of fluid from one line to another.

EFFECT: facilitating multi-functionality of device, simplicity of fabrication, high maintainability, easy control and high reliability.

5 dwg

 

The invention relates to a hydraulic drive quarry drilling rig used for drilling blast holes in rocks that have a monolithic, fractured and destroyed by the explosion of the structure and, in particular, hydraulic actuator, by which the management of the feeder (which included becoming drilling and the drill head connected to the hydraulic cylinders cable polyspastny system), creating an axial force on the roller bit, as well as speed and power control of auxiliary mechanisms of the machine.

The peculiarity of drilling on the broken rock mass lies in the possibility of failure of the drilling tool, due to the abrupt change in resistance to its movement and the fall of the drill head under the action of its own weight, and as a result, jamming of the drilling tool and the emergency exit from the building.

Other applications of the invention: hydraulic control excavator bucket, platforms, hydraulic presses and machines.

Analogue of the invention is the device described in the Manual quarry drilling rig rig TRD-250 MNA-32 manufactured by JSC "Rudgormash", Voronezh, with hydraulic 091-02.78.0000, which consists of the valve distributor 091-02.78.0700, electrohydrodynamical drain from Porsche the eve of the cavity in the drilling process, managed the locking valve cut, the control unit lock pressure relief valves protect the hydraulic system from overload relief valve protect the piston cavities of the hydraulic cylinders supply.

The disadvantage of this hydraulic drive is low maintainability, availability hammer blackouts, and also the lack of protection for the rod ends of the cylinders feed and mechanisms, driven with their help, from overloads.

The coincidence of the essential features of the claimed invention were made in the use of embedded operated valves in the distribution system.

DISCLOSURE of INVENTIONS

The invention consists in obtaining technical solutions in the form of a hydraulic device with features:

1) valve - fluid in the cavity of the hydraulic motor with the required flow and drainage of fluid from the cavity into the drain line;

2) safety valve to protect the oral and hydraulic mechanisms, driven them in motion, from overloads;

3) the pilot-operated check valve - locking cavity of the hydraulic motor and the load retention in limbo;

4) damping cavity hydraulic cylinders for continuous movement at a given speed and exclusions of its acceleration under the action of the weight and inertial forces when a sudden change, in the lower side, there is via external forces (destroyed rock cavities, voids);

5) ensure the device works two-way hydraulic cylinder, a differential circuit for obtaining equality of the velocity of the piston in both directions.

The aim of the invention is to improve the dynamic and operational characteristics of the hydraulic drive quarry drilling rig.

This goal is achieved by using the claimed invention three-way valve three-position hydraulic valve with line protection challenge against overload, its locking and damping containing a rectangular metal casing joint Assembly outlet, underwater and drain lines, pressure relief valve with pilot operated valve with pilot and two check valves, each of which includes a sleeve-saddle, ball and spring. At the end of the body, on its long axis, integrated pressure relief valve with two control valves and pilot, alternately connecting the latter to nallathanni cavity pressure relief valve, perpendicular to the long axis of the hull is built operated valve with pilot, with subvalvular cavity pressure relief valve are connected by a channel with a lateral surface of the gate controlled valve and a drain line, the feed line is connected to the subvalvular cavity controlled valve, a drain line connected with the side surface is Yu relief valve, and outlet channels of the drainage lines and supply installed check valves, tightly overlapping the latter from contamination of fluid from one line to another, as well as providing a supply pressure control, resulting in the lines drain and supply, nadupanou cavity locking element controlled valve.

When this flow characteristic of a valve constructed based on the maximum flow rate provided by the valves and the diameters of the inlet and outlet channels, to obtain the moving speed of drill rod not less than 15 m/min at a fourfold polyspastny the connection system with cylinders having diameters of the piston and rod is equal to 280 mm and 180 mm, respectively.

where Q is the desired flow rate l/min;

V - speed of movement of the drill head, equal to 150 DM/min;

S - the total area of the rod ends of the cylinders, DM2

n=4 - multiplicity polyspastny system.

GET the TECHNICAL RESULT

- Multi-functional device with the functions of the distributor,

relief valve, pilot-operated check valve with damping plum.

- Ease of manufacture of the dispenser with high maintainability.

- Ease of use.

- High reliability.

- Ability to use dispenser in AB is somatizirovanne the hydraulic drive with the use of its safety valve with proportional control.

LIST of DRAWINGS

1, 2, 3, 4 - valve, three-way three-position hydraulic valve with line protection removal from overload, its locking and damping:

1 - metal case with underwater, and lateral drain channels;

2 operated valve with pilot control type VE-HA - analogue controlled valve MKGU/PD, having a maximum flow rate of 460 l/min, production GSTB HA, Gomel, Republic of Belarus;

3 - relief valve plug Assembly with two speed settings MKV/SF, production GSTB HA, Gomel, Republic of Belarus, having a maximum flow rate of 460 l/min and limit control pressure 10-125 kgf/cm2;

4 - check valve plug Assembly;

5 - Bush-saddle valve;

6 - ball;

7 - spring.

Figure 4 - scheme of work distributor:

8 - set distribution of the working fluid of the hydraulic drilling rig;

9 - hydraulic drive feeder having diameters of piston and rod 280 and 180 mm, respectively;

10 - feeder weight equal to 6 TC connected to the four cylinders polyspastny system.

DESIGN DESCRIPTION

Dispenser, 1, 2, consists of a metal casing 1 of rectangular shape butt-mounted underwater, and lateral drain channels connected on the butt PLO the bone and having a groove for installation of o-rings. At the end of the body, on its long axis, integrated pressure relief valve 3 with two speed settings and a pilot, alternately connecting the control valve to nallathanni cavity of the main valve. Perpendicular to the long axis of the hull is built operated valve 2 with the pilot, with subvalvular cavity pressure relief valve are connected by a channel with a lateral surface of the gate controlled valve and a drain. Fluid input is in subvalvular cavity controlled valve. The drain channel is connected with the side surface of the safety valve. In the drainage channels of the inlet and outlet of the housing, mounting cover (flange)designed to lock the bolt in the housing and mounting the pilot, built-in check valves 4, consisting of a body 5, the ball 6 and the spring 7. The valves tightly close the channels from contamination of fluid from one line to another, and also provide simultaneous supply of the control pressure arising in the channel inlet and outlet, nadupanou cavity. Plums with pilot control - independent.

The distributor housings and check valves made of appropriate grades of steel and heat treatment.

The principle of operation of the distributor 1, 2, 3, 4, 5 based on the functional purpose of each hidroapparatus included in a device is TBA:

1) operated valve 2 is designed for leak-lock outlet and inlet lines, and transmission fluid from the feed line into the drain line through the switching pilot electric means of incorporation. The initial position of the valve is normally closed.

2) safety valve 3 with two speed settings and a pilot, alternately connecting one or the other control valve to nallathanni cavity of the main valve electrical means include, depending on the change direction of flow of the working fluid. Provides line protection challenge against overloads under pressure settings of the first degree, as well as its damping at the outlet to discharge pressure setting of the second stage. The initial position is normally loaded high pressure first stage.

3) check valves 4 are intended for the supply of the control pressure in nadupanou cavity locking element controlled valve 2 at the same time line inlet and outlet. Provide the managed closure of the valve as the pressure created in the line of withdrawal weight of the drill head, and the pressure in the feed line.

Fluid input rod in the cavity of the cylinders is effected by switching on the pilot controlled valve 2, closing the pressure supply control back from KL who Panov 4 and connecting nadupanou cavity with sink, when the working fluid flows into the rod cavity of the hydraulic cylinders with pressure equal to the setting up of a high pressure first stage safety valve 3.

The exhaust fluid from the rod ends of the cylinders is carried out by the electromagnet pilot safety valve 3 that connects the control valve second stage with a pressure proportional to the force generated weight (F=6 TC) of the feed mechanism for the cylinders 9.

The estimated driving force on the rod is developed by the fluid pressure on the piston is equal to

where pĚS - force piston working area under fluid pressure;

RTrthe friction force in the cylinder seals;

RCR- power protivopoazaniya, including in the polyspastny system;

Rin- inertia of moving parts.

Hence the pressure in the rod end of the cylinders (simplified formula)

where S is the total area of the rod ends;

n=4 - multiplicity polyspastny system.

The actual pressure supply system, which is fixed in a suspended state, measured by a manometer in the rod end of the cylinders, amounted to p=25 kgf/cm2.

In the process of drilling Urawa head (motor, the gear carrier and the clutch is connected through a splined connection with a sliding fit with the drill rod) weight 4 TC creates in the rod end pressure equal to

The actual pressure measured by the same gauge, amounted to p=20 kN/cm2that corresponds to a force equal to

to overcome which it is necessary to increase the pressure in the hydraulic system for creating an axial force on the roller bit Q=28 TC, which includes the weight of the drilling rod, equal to 2 (two) TC

where- the total area of the pistons of the cylinders.

In the case of a sharp decrease of the external resistance (destroyed rock, emptiness), becoming drilling will remain motionless, held the drill head, due to the pressure created in the rod cavities.

It was established experimentally that the work of the two-way hydraulic cylinders differential circuit with a controllable valve having a shut-off element has a cylindrical shape, is carried out with a significant increase in pressure in the hydraulic system. The opening of the controlled valve having a stepped shape is pressure from the rod ends of the cylinders, and the line-side supply current on the belt, side, and under lapanday surface of the locking element, providing a full opening with the exception of increasing the pressure in the hydraulic system.

Thus, the combination of a hydraulic apparatus, collected into a single device that forms

1) three-line diagram of distribution;

2) three positions: normally - closed - all lines locked;

the connection lines approach-retraction when the pilot controlled valve; connection lines sewer and drain when the pilot safety valve with damping.

By functionality:

1) distribution;

2) safety valve - line protection challenge against overloads;

3) the pilot-operated check valve - locking the rod ends of the cylinders through a normally closed controlled valve and safety valve;

4) damping - displacement of working fluid from the rod ends of the cylinders pressurized equal to the setting of the low pressure second stage relief valve.

Valve three-way three-position hydraulic valve with line protection challenge against overload, its locking and damping containing a rectangular metal casing joint Assembly outlet, underwater and drain lines, pressure relief valve with pilot operated valve with pilot and two check valves, each of which includes a sleeve-saddle, ball and is rugina, characterized in that the end of the body along its long axis integrated pressure relief valve with two control valves and pilot, alternately connecting the latter to nallathanni cavity pressure relief valve, perpendicular to the long axis of the hull is built operated valve with pilot, with subvalvular cavity pressure relief valve are connected by a channel with a lateral surface of the gate controlled valve and a drain line, the feed line is connected to the subvalvular cavity controlled valve, a drain line connected with the side surface of the safety valve, and the outlet channels of the drainage lines and supply installed check valves, tightly overlapping the latter from contamination of fluid from one line to another, as well as providing a supply of control pressure arising in the lines drain and supply in nadupanou cavity locking element controlled valve.



 

Same patents:

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FIELD: machine building.

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FIELD: machine building.

SUBSTANCE: invention relates to hydro pneumatic automatic control devices and can be used in aircraft hydraulic control systems. The proposed valve incorporates a body with the pressure, control and drain channels separated by two cups arranged in the valve body and provided with aligned grooves and holes. A push rod is arranged in the said grooves to move therein. The aforesaid holes in the cups are made on both sides of the push rod to contact, by their outer edges, with the ball-like shut-off members. One of the said balls, on the drain side, interacts with a spring-loaded rod moving inside the electromagnetic drive stator. Note that in one position of the aforesaid rod, the control channel communicates with the drain line while, in the other position, it communicates with the pressure channel. There is a spring-loaded plunger fitted in the valve body of the pressure side, its end face interacting with the shut-off member on the aforesaid side. Cylindrical collars are made on the outer surface of every cup on the side of holes and aligned with them. One of the said collar accommodates on the drain side a sleeve locked in a blind groove aligned with the sleeve through hole receiving a ball. The collar of other cup, but on the pressure side, accommodates a similar sleeve with the ball.

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EFFECT: facilitating multi-functionality of device, simplicity of fabrication, high maintainability, easy control and high reliability.

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EFFECT: improved processability of fabrication, simplification of jet amplifier design and facilitation of its adjustment with high accuracy.

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SUBSTANCE: two-position hydraulic distributor with pulse control refers to hydraulics and can be used as hydraulic equipment of mobile machines. A valve of the hydro-distributor slides along a guide block and is fixed in two points, when control pulse electric signal is transmitted to electro-magnetic valve.

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FIELD: engines and pumps.

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EFFECT: higher reliability of hydraulic system.

10 cl, 3 dwg

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