CN1140229A - Propelling system for hydraulic jumbo - Google Patents

Abstract

A propelling system for hydraulic drill truck is composed of pressure release valve, control valve, reversal valve and propelling cylinder. Said control valve has upper spring cavity and lower valve cavity and in spring cavity there are pressure regulation piston, spring and spring seat, which are sequentially connected to valve core to form moving portion of the valve, which is connected via pipeline to reversal valve for driving propelling cylinder. Regulating output of pressure release valve can control the pressure of propelling cylinder in stepless mode, realizing stepless control of propellant force. Its advantages are simple structure, less number of valves, and adapting different work conditions.

Description

A kind of propulsion system of hydraulic drill rig

The present invention relates to a kind of fluid pressure executive system.

At present, the hydraulic system of drill carriage generally adopts the control of 2～3 stage pressures to realize touching, heavily pushing away and the rollback function of drill carriage, promptly in advancing the loop, coordinate to be provided with 2～3 grades of different pressures control loops, the valve member contact that has the logic control function therebetween by some, for example: in May, 1989, Central-South Polytechnic University Publishing House published, China is neat appoints in " hydraulic vibration equipment Dynamic Theory and design " book that virtuous, Liu Shixun etc. writes, § 1.4 chassis hydraulic systems (P7～10) have just adopted the control of secondary remote pressure regulating valve to advance oil pressure.Need according to concrete operating mode during propelling, these have the valve member of logic control function artificial control, make it be in the different operating state, then advance some a certain specified pressure valve work in the loop with different controlled pressures, the corresponding operating mode that advances of control, coordinate impact operating mode at that time, so that opening the door light the dashing that system is achieved in the rock drilling operation touched, heavily dashed during normal rock drilling and heavily push away and the rollback function.This propulsion system though can adapt to the part operating mode, can not satisfy the requirement of actual job condition to the control of propelling pressure stepless continuous owing to only be provided with several grades of limited propelling controlled pressures, has influenced the smooth implementation of optimum condition in the hydraulic rock operation.Because this propulsion system adopts discrete pressure control loop, so there is complex structure in system, many with valve quantity, energy loss is big, shortcomings such as poor reliability; Simultaneously because system pressure control must be by manually adjusting each branch road pressure valve realization one by one, so system has the drawback of the inconvenience regulated, automaticity difference again.

For realizing propelling pressure control by there being the discrete control of level to control transition to stepless continuous, the simplification propulsion system structure reduces with valve quantity and energy loss, and for improving its automatization level, the present invention proposes and counts a kind of new hydraulic drill rig propulsion system simultaneously.

The present invention is advanced pressure control valve 2 (hereinafter to be referred as control valve 2), reversal valve 3 and is advanced oil cylinder 4 (or motor) to form by guide's reducing valve 1 (hereinafter to be referred as reducing valve 1), remote control.Wherein the valve body 13 formation spring cavitys 20 of valve gap 9 and bottom are established on the top of control valve 2, constitute valve pocket 30 by valve body 13 and spool 14.In spring cavity 20, built-in relief piston 10, spring 11, spring base 12, they link to each other successively with spool 14 in the lower body 13, constitute the upper and lower motion parts of this valve.Relief piston 10 is designed to " recessed " font, its epicoele pressure regulation area A ₁, according to needing replaceable relief piston 10, to increase or to dwindle its pressure regulation area A ₁Valve gap 9 has top mouth 18 and side mouth 19; Elongated throttle orifice 17 is offered at spool 14 middle parts, valve body 13 both sides have oil-in 16 and oil-out (pressure-reduction outlet) 15, oil-in 16 positions are high slightly, when spool 14 moves up and down, so that oil-in 16 area of passage sizes can not change, the area of passage size of oil-out (pressure-reduction outlet) 15 then can change.Valve body 13 bottoms have an oil duct 28, and it couples together oil-out (pressure-reduction outlet) 15 and spool 14 cavity of resorptions.

Another technical characterictic of the present invention, comprise in left reducing valve 5, right reducing valve 6, shuttle valve 8 and the control crank 7 at guide's reducing valve 1, by set oil duct 21,22 and 21 ', 22 ' respectively be connected with left and right reducing valve 5,6, its pressure output control oil content not through oil duct 21,23 and 21 ', 23 ' act on reversal valve 3 left and right two ends advance oil cylinder 4 with control advance and retreat.One-sided hydraulic oil through shuttle valve 8 outputs connects relief piston 10 epicoeles by oil duct 24, top mouth 18, and the output of control valve 2 connects reversal valve 3 through oil duct 25, drives oil cylinder 4 work that advance.The top mouth 18 of valve gap 9 is communicated with the epicoele of relief piston 10, communicates with spring cavity 20 in the side mouth 19, links to each other with oil sump tank by oil duct 29 outward, and relief piston 10 can be changed, thereby can correspondingly change its pressure regulation area A ₁, with fixation pressure P with reducing valve 1 _KOutput area and propelling oil cylinder 4 required operating oil pressure P _TScope ideally matching and coordination get up, realize different pressures coupling requirement therebetween, as the bigger propelling pressure P of needs _TThe time, can be with area A ₁Design greatlyyer, otherwise can make its area less.Require it that certain pre compressed magnitude is arranged on spring 11 structures, to realize only exporting the minimum controlled pressure P that is enough to make reversal valve 3 actions when reducing valve 1 _KSituation under, keep the minimum secondary oil pressure output P of control valve 2 _T, required oil pressure when guaranteeing the propelling of the empty implementation of propeller journey makes bore bit contact scar smoothly and don't cause and skids, in order to the rock drilling perforate; Because different hydraulic drill rig propulsion systems is to its minimum secondary oil pressure output P _TDifferent requirements is arranged, therefore should select the spring of corresponding different pre compressed magnitudes as required, to coordinate the propulsion system function.The effect of the elongated throttle orifice 17 of spool 14 is, when system if run into propelling resistance very big (as card pricker operating mode), when fltting speed is very slow, control valve 2 is still exported a spot of hydraulic oil stream, can pass through oil duct 28, spool 14 cavity of resorptions, elongated throttle orifice 17, spring cavity 20, valve gap side mouth 19 and oil duct 29 to external leakage, form the circulation of control valve 2 interior oil stream, keep the high pressure that advances in the oil cylinder 4, guarantee the steady operation of control valve 2.If there is not elongated throttle orifice 17, then when advancing oil pressure P _TWhen excessive, spool 14 moves on the effect lower compression spring 11 that is subjected to from oil duct 28 abnormal pressure oil, pressure-reduction outlet (oil-out) 15 may be blocked, and causes the non-normal working of this valve.

Owing to adopted above-mentioned control system, make advance oil cylinder 4 (motor) but the propulsive force continuous control, simplified system architecture, reduced with valve quantity and energy loss, system can also increase the automatic anti-blocking function easily and move back the pricker function in addition.

Fig. 1 is the schematic diagram of hydraulic drill rig propulsion system.

Below in conjunction with the drawings and specific embodiments the present invention is further described.When control crank 7 counterclockwise rotates (clockwise direction also together), left reducing valve 5 work of reducing valve 1, the control oil stream of its output affacts reversal valve 3 left sides by oil duct 21,23 on the one hand, makes its position, left side work, and corresponding control advances the duty of oil cylinder 4.On the other hand, it controls oil pressure P by shuttle valve 8, oil duct 24 as output _KAffact the relief piston 10 epicoele pressure regulation area A of control valve 2 ₁On, establish control oil pressure P _KBe a certain determined value, it is by the epicoele pressure regulation area A of relief piston 10 ₁Apply certain hydraulic action F downwards ₁, this directed force F ₁Be delivered on spool 14 end faces by spring 11, spring base 12.After input advances oil pressure P to enter valve pocket 30 by oil duct 27, via pressure-reduction outlet (oil-out) 15, oil duct 25 output secondary pressure P _T, P _TImport propelling oil cylinder 4, the secondary pressure P of its output simultaneously into through reversal valve 3 _TAffact spool 14 bottom area A through oil duct 28 ₀On, with balance by control oil pressure P _KAct on the epicoele pressure regulation area A of relief piston 10 ₁The directed force F that is delivered to spool 14 end faces that is produced ₁, if the secondary pressure P of this valve output _TGreater than by control oil pressure P _KThe propelling pressure value P of (deciding) defined by operating mode _G, then because it acts on spool 14 bottom area A ₀The directed force F that is produced ₀Will be greater than acting on relief piston 10 epicoele pressure regulation area A by the control oil pressure ₁The directed force F that is produced ₁, spool 14 moves up, and pressure-reduction outlet (oil-out) 15 flow sections are long-pending to be reduced, and restriction loss increases, output secondary pressure P _TReduce, up to P _T=P _GTill; If the secondary pressure P of this valve output _TPressure value P less than regulation _G, then because it acts on spool 14 bottom area A ₀The directed force F that is produced ₀Will be less than acting on relief piston 10 epicoele pressure regulation area A by the control oil pressure ₁The directed force F that is produced ₁, spool 14 moves down, and pressure-reduction outlet (oil-out) 15 flow sections are long-pending to be increased, and restriction loss reduces, output secondary pressure P _TRaise, up to P _T=P _GTill.Control valve 2 is exported secondary pressure P like this _T(need satisfy P with input oil pressure P is irrelevant _T＜P), only with controlled pressure P _KBe approximated to direct ratio, system needs only people's pressure output of reducing valve 1 for a change, promptly changes the input controlled pressure P of control valve 2 _K, just can realize output oil pressure P to control valve 2 _TControl, finish that correspondingly system is advanced oil pressure P _TControl.Because the pressure output control signal P of reducing valve 1 _KBe directly proportional with the manipulation inclination angle [theta] of its control control crank 7, again since the manipulation inclination angle [theta] of the control crank 7 of reducing valve 1 can continuously change, so the control oil pressure P of system _KAlso can change continuously.In a word, the manipulation inclination angle [theta] of the control crank 7 that system can be by changing reducing valve 1 simply directly realizes the stepless continuous control to propelling pressure, satisfies the requirement of actual condition to the propulsive force continuous control.For satisfying the operating mode needs, be equipped with the automatic anti-blocking function in the actual propulsion system and move back the pricker function, this can realize in native system equally.

Claims (7)

1. hydraulic drill rig propulsion system, it is by reducing valve (1), reversal valve (3), advance oil cylinder compositions such as (4), reducing valve (1) comprises left reducing valve (5), right reducing valve (6), shuttle valve (8) and control crank (7), it is characterized in that: the valve gap (9) on control valve (2) top constitutes spring cavity (20) with the valve body (13) of its underpart, constitute valve pocket (30) by valve body (13) and spool (14), in spring cavity (20), built-in relief piston (10), spring (11), spring base (12), they with lower body (13) in spool (14) link to each other successively, by set relevant oil duct respectively with reversal valve (3), advance oil cylinder (4) and hydraulic oil P and oil return T to communicate.

2. hydraulic drill rig propulsion system according to claim 1 is characterized in that: the relief piston (10) of control valve (2) is set as " recessed " font, according to required area (A ₁) big or small requirement, it can be changed.

3. hydraulic drill rig propulsion system according to claim 1 is characterized in that: the pre compressed magnitude of spring (11), need determine according to system.

4. hydraulic drill rig propulsion system according to claim 1, it is characterized in that: the valve gap (9) of control valve (2) has top mouthful (18) and side mouth (19), oil-in (16) and oil-out (pressure-reduction outlet) (15) are offered in valve body (13) both sides, and oil-in (16) position is high slightly.

5. hydraulic drill rig propulsion system according to claim 1 is characterized in that: throttle orifice (17) is offered at spool (14) middle part of control valve (2), and has oil duct (28) in valve body (13) bottom.

6. hydraulic drill rig propulsion system according to claim 4 is characterized in that: the top mouth (18) of the valve gap (9) of control valve (2) is communicated with relief piston (10) epicoele, communicates with spring cavity (20) in its side mouth (19), links to each other with back oil road (29) outward.

7. hydraulic drill rig propulsion system according to claim 5, it is characterized in that: be to guarantee the steady operation and the circulation of interior oil stream of control valve (2), oil duct (28), throttle orifice (17), spring cavity (20), side mouth (19), oil duct (29) are set are communicated with oil sump tank.

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