CN2548783Y - Trigger-type double-acting control valve - Google Patents

Abstract

A trigger type double-acting control valve realizes the control via double actions of the on/off of an oil pump on hydraulic machinery and pressing down/reset of an operation handle, mainly comprising two parts of a handle control part and a valve body part. A hand control part of the utility model is beyond operation by other parts of a body except the hands. When the utility model is used, (1) when the oil pump is running and the operation handle is in a reset state, and an oil hole which is connected to a working oil cylinder is closed, and the oil hole which is connected to an oil tank is opened. The working oil cylinder is obstructed from an oil outlet of the oil pump/the oil tank, and the oil outlet of the oil pump is communicated to the oil tank; (2) When the oil pump is running and the operation handle is in a pressing-down state, the oil hole which is connected to the working oil cylinder is opened, and the oil hole which is connected to the oil tank is closed. The working oil cylinder is communicated to the oil outlet of the oil pump, and the working oil cylinder/the oil outlet of the oil pump are obstructed from the oil tank. (3) When the oil pump stops running and the operation handle is in the pressing-down state, the oil holes which are connected to the working oil cylinder and the oil tank are both closed. The working oil cylinder, the oil outlet of the oil pump and the oil tank are all obstructed. (4) When the oil pump stops running and the operation handle is in the reset state, the oil holes which are connected to the working oil cylinder and the oil tank are both opened. The working oil cylinder is communicated to the oil tank.

Description

Trigger type double-action control-valve

Technical field

The utility model belongs to the protective device that dissects the operating area, in detail, for example when using the timber fish gutting machine to comprise small-sized, family expenses fish gutting machine, protection operator's device.

Background technology

Have dangerous machinery for some, universal demand is installed " both hands handle simultaneously " device, in the mechanical work process, accident is positioned over the deathtrap and damages accident with the arm that prevents the operator.

Along with the development of society, machinery " both hands handle simultaneously " require standard more and more higher.The European standard of new promulgation in 1999 has proposed new requirement (European Standard EN 609-1:Agricultural and Forestry Machinery-Safety of Log Splitters-Part 1:Wedge Splitters, 4.6 Guarding of theSplitting Zone) at the control protection of " bit formula timber fish gutting machine ":

B) layout of hand control position should guarantee the operator can platen with not dissect bit, timber with dissect bit, squeeze between other parts of platen or machinery and hinder.Use the two-hand control device (referring to standard EN 574:1996,9.1 to 9.4 and 9.6) that meets following requirement fully can reach this requirement.

[b)Layout?of?the?manual?controls?so?that?the?operator?cannot?be?caughtbetween?the?pressure?plate?and?the?splitting?wedge，or?between?the?log?andsplitting?wedge，the?pressure?plate?or?other?parts?of?the?machine.Thisrequirement?is?satisfied?by?using?two-hand?controls(see?EN?574：1996，9.1?to9.4?and?9.6)which?conform?to?all?of?the?following：]]

The two-hand control device should be the form of " grip start ", and just operator's both hands break away from any one hand control position, the dissecing operation and all should stop rapidly of machinery, and

[---The?two-hand?controls?shall?be?of?the“hold-to?run”type，i.e.thesplitting?process?is?stopped?if?either?manual?control?is?released；and]

When any one hand control position was in the enable possition, the action component of machineries such as bit or platen should not playback to initial position, and

[---the?wedge/pressure?plate?shall?not?return?to?the?starting?position?ifone?manual?control?in?the“on”position；and]

Guarantee that machinery can unexpected startup not dissect operation, perhaps allows the operator to use other parts of hand, arm and a health to handle two hand control positions simultaneously.

[---it?shall?be?impossible?to?start?the?splitting?process?inadvertently?or?tooperate?both?manual?controls?simultaneously?with?one?hand?or?arm?or?withother?parts?of?the?body(see?EN?574：1996，9.1?to?9.4?and?9.6)；and]

For example; European patent EP 0806271 disclosed a kind of timber fish gutting machine hydraulic servo control valve system; the joystick of this system is without any protective device; the operator can use other parts of pin or health to replace a hand to operate, and therefore dissecing operation just may cause unexpected injury to this hand that the operator gets off the free time.Simultaneously, in this control valve system, as long as the operator unclamps any hand that grips pump switch or joystick, the hydraulic oil in the operating cylinder chamber will be to the fuel tank draining, and hydraulic piston/push rod can drive platen at once and return playback to the initial position of machinery.These 2 all do not meet foregoing European standard.

In general, in, large-scale hydraulic machineries such as timber fish gutting machine, be to reach above-mentioned European standard by increasing control element such as magnetic valve; But for hydraulic machineries such as timber fish gutting machine small-sized, family expenses, because the strictness of installing space and cost restriction can't be installed this type of complexity, expensive control element.

Summary of the invention

The purpose of this utility model is to provide a kind of trigger type double-action control-valve, this control valve:

1, the operator can only operate with hand, and other limbs of health all can't change its duty;

When 2, any hand of operator broke away from the control position, the action component of hydraulic machinery stopped any action rapidly;

3, has only when two hands of operator all leave the control position action component of the hydraulic machinery initial position that just playbacks;

4, can mechanically use at the limited small-sized hydraulic of installing space;

5, its manufacturing cost is lower.

For achieving the above object, the control valve that the utility model provides is used for finishing control by the double cropping of depressing/resetting of oil pump ON/OFF and joystick on the hydraulic machinery, and its basic principle is made up of handle control section and valve body two parts, wherein:

The handle control section has:

The one handle mount pad is blocks, is fixed on the hydraulic machinery body, and a projection that is del is arranged in this mount pad, and also be provided with on the same side: a through hole is arranged at its top; Its underpart and the corresponding opposite side of inverted triangle projection have a cylinder shape groove, and a stop block is arranged under the groove.The handle mount pad can make earlier that the plate body of two same sizes and shape is involutory then fixedly to form, also can with a monoblock sheet material through milling, manufacturing process such as mill, boring make.

One joystick is slightly curved shape, and angle of bend feels comfortably cool to good when holding.Respectively there is a through hole at its top and middle part, and with mount pad on through hole in the same way.The direction of through hole is vertical on the through hole of handle bottom and the mount pad.

One trigger is a flute profile, and its upper end direction outside groove has a bead, and respectively there is a coaxial through hole at the last angle of two trough rims.

Joystick is embedded in the groove of trigger, with the through hole of pivot pin by trigger and handle middle part, with the rotatable certain angle of trigger be fixed on the handle end of the affixed spring leaf in handle bottom, its other end is resisted against in the trigger groove, and trigger is not resetted when having external force.

With pivot pin by on the joystick with the handle mount pad on through hole fix, make handle rotatably movable on mount pad.

Because the bead on the trigger props up the stop block on the mount pad, projection and trigger that joystick is mounted on the seat limit and can't move forward and backward; When pulling trigger, handle can be passed LAP forward.

Valve body includes:

A multidiameter is carse, medium and small three sections and form two shaft shoulders, and wherein there is a groove at place, the end limit of thin segment.

A pressure inductor is set on the thin segment of multidiameter, and limits its shift position by a stop that is arranged on the thin segment groove.

One spring is sheathed on the thin segment of multidiameter and is resisted against pressure inductor.

One valve pocket, ccontaining above-mentioned multidiameter and spring, thick section of its multidiameter stretches out in valve pocket.

Valve pocket is inserted in the cylinder shape groove on the mount pad, and thick section of multidiameter that stretches out in valve pocket is resisted against joystick, and stretches by the action of joystick/shrink in the valve pocket.

Offer 4 oilholes on the valve pocket, be respectively two A hole and D holes that connect the fuel tank of hydraulic machinery, a B hole that connects hydraulic machinery oil pump oil-out, a C hole that connects the hydraulic machinery operating cylinder; The corresponding relation of offering spacing and each section of multidiameter of described each oilhole is: when depressing joystick, and thick section sealing A hole of multidiameter, and sealing C hole, the shift position of pressure inductor.

According to above-mentioned basic principle, wherein valve body can also include:

Two valve bodies that are arranged in parallel are respectively upper valve body and following valve body.

Installing back-moving spring and multidiameter in the upper valve body, this spring is replaced the top of multidiameter, and the stage casing of this multidiameter is a thin segment, and top and middle part are thick section, are a dumbbell shaped; Be communicated with the A hole of fuel tank on this multidiameter and the upper valve body and be communicated with the C1 hole of operating cylinder, the corresponding relation in C2 hole is: when joystick is not depressed, multidiameter is subjected to replacing of back-moving spring, the thick section sealing C1 hole on multidiameter top, the valve port of the thick section sealing upper valve body at multidiameter middle part; When the controlled handle of multidiameter is oppressed, the thick section sealing A hole at multidiameter middle part, the butt end sealing C2 hole on top.

Be equiped with spring, stop and pressure inductor in the following valve body, spring is placed in the stop and replaces pressure inductor; When oil pump did not turn round, pressure inductor was replaced by spring, and sealing is the B hole of valve body connection oil pump oil-out down; During the oil pump running, contract in the inductor, and limited device supports only spacing.

Be communicated with two pipeline A and B between upper valve body and the following valve body, the A pipeline on the upper valve body between A hole and C1 hole, its other end is positioned at valve body port place down; The B pipeline is positioned on the upper valve body place, C2 hole, and its other end is positioned at the inner of valve body down and after stop.

The utility model in use, when (1) oil pump running and joystick were reset mode, the oilhole that connects operating cylinder was closed, the oilhole that connects fuel tank is opened.Operating cylinder cuts off with oil pump oil-out/fuel tank, and the oil pump oil-out is communicated with fuel tank.When (2) oil pump running and joystick were depressed state, the oilhole that connects operating cylinder was opened, and connects the oilhole sealing of fuel tank.Operating cylinder is communicated with the oil pump oil-out, and operating cylinder/oil pump oil-out cuts off with fuel tank.(3) oil pump shuts down and joystick when being depressed state, and the oilhole that connects operating cylinder and fuel tank all is closed.Operating cylinder, oil pump oil-out, fuel tank three all are cut off.(4) oil pump shuts down and joystick when being reset mode, and the oilhole that connects operating cylinder and fuel tank all is unlocked.Operating cylinder is with the connection of fuel tank.

Description of drawings

Fig. 1 is the basic principle assembling exploded view of the utility model control valve;

Fig. 2 is the basic principle assembling schematic diagram of the utility model control valve;

Fig. 3 is the utility model in hydraulic machinery uses, the operation principle schematic diagram when being in the standby recurrent state;

Fig. 4 is the utility model in hydraulic machinery uses, the operation principle schematic diagram when being in the oiling duty;

Fig. 5 is the utility model in hydraulic machinery uses, the operation principle schematic diagram when being in shutdown oil sealing state;

Fig. 6 is the utility model in hydraulic machinery uses, the operation principle schematic diagram when being in standby oil sealing state;

Fig. 7 is the utility model in hydraulic machinery uses, the operation principle schematic diagram when being in shutdown draining state;

Fig. 8 is the assembling schematic diagram of the described control valve of embodiment;

Fig. 9 is the described control valve of embodiment in hydraulic machinery uses, the working state schematic representation when being in the standby recurrent state;

Figure 10 is the described control valve of embodiment in hydraulic machinery uses, the working state schematic representation when being in the oiling duty;

Figure 11 is the described control valve of embodiment in hydraulic machinery uses, the working state schematic representation when being in shutdown oil sealing state;

Figure 12 is the described control valve of embodiment in hydraulic machinery uses, the working state schematic representation when being in standby oil sealing state;

Figure 13 is the described control valve of embodiment in hydraulic machinery uses, the working state schematic representation when being in shutdown draining state;

Figure 14 is used for schematic perspective view on the hydraulic machinery for the utility model.

The specific embodiment

Basic technique principle of the present utility model is described by embodiment 1, elder generation, and for ease of explanation, present embodiment is an example with better simply orthoscopic control valve.Though present embodiment is just described basic technique principle of the present utility model, the control valve of describing goes for the hydraulic pressure timber fish gutting machine of long and narrower installing space.

Please in conjunction with Fig. 1 and Fig. 2, the orthoscopic control valve that present embodiment provides is fixed on the hydraulic pressure timber fish gutting machine by one handle mount pad 1.This mount pad 1 is a blocks, is to be processed into identical shape with identical machining process on the sheet material of two same sizes, involutory then being fixed as one.It is shaped as: a projection 101 that is del is arranged on the one side, and also be provided with on the same side: a through hole 102 is arranged at its top; Its underpart and projection 101 corresponding opposite sides have a cylinder shape groove 103, and a stop block 104 is arranged under the groove.

One joystick 2 is slightly curved shape, and angle of bend does not have strict restriction, feel comfortably cool when holding and suitable be operating as good; Respectively there is a through hole 201,202,203 upper, middle and lower of this handle 2, wherein, the through hole 201,202 at top and middle part and the through hole 102 on the mount pad in the same way, the direction of the through hole 102 on the through hole 203 of bottom and the mount pad is vertical.

One trigger 3 is a flute profile, and its upper end direction outside groove has a bead 301; Respectively there is a coaxial through hole 302 at the last angle of two trough rims.

Joystick 2 is embedded in the groove of trigger, with the through hole 202 of pivot pin by trigger 3 and handle 2 middle parts, with trigger 3 rotatable certain angles be fixed on the handle 2, one end of through hole 203 affixed spring leafs 4 of handle 2 bottoms, the other end of this spring leaf is resisted against in trigger 3 grooves, and trigger 3 is resetted when not having external force.

Fix by the through hole 201 on joystick 2 tops and the through hole 102 on the handle mount pad 1 with pivot pin, make handle 2 rotatably movable on mount pad 1.

Joystick 2 after the installation is not when pulling trigger 3, because the bead 301 on the trigger 3 props up the stop block 104 on the mount pad 1, projection 101 and trigger 3 that handle 2 is mounted on the seat 1 limit and can't move forward and backward; When pulling trigger 3, handle 2 can be passed LAP forward.

The control valve that the utility model provides also includes:

A multidiameter 5 is carse, medium and small three section 501,502,503 and form two shaft shoulders.Wherein the end face of thick section 501 is a hemispherical, with the friction of minimizing with joystick 2.

A pressure inductor 7 is set on the thin segment 503 of multidiameter 5, and limits its shift position on thin segment 503 by a stop 9 that is arranged on thin segment 503 grooves.

One spring 10 is sheathed on the thin segment 503 of multidiameter 5 and is resisted against an end face of pressure inductor 7.

One valve pocket 11, ccontaining above-mentioned multidiameter 5 and spring 10, thick section 501 of its multidiameter 5 stretches out in valve pocket 11.

Valve pocket 11 after the assembling is inserted in the circular groove 103 on the mount pad 1, and thick section 501 of multidiameter 5 that stretches out in valve pocket 11 is resisted against joystick 2, and stretches in valve pocket 11 by the effect of joystick 2 actions and spring 10.

Also offer 4 oilholes on the valve pocket 11 described in the utility model, the convenience in the narration is referred to as A, B, C, D hole, wherein, the A hole is connected the fuel tank of hydraulic machinery with the D hole, the B hole connects the oil pump oil-out of hydraulic machinery, and the C hole connects the operating cylinder of hydraulic machinery.The corresponding relation of offering spacing and multidiameter 5 each sections 501,502,503 of these oilholes is: when depressing mechanical handle 2, thick section 501 of multidiameter 5 closes the A hole just, and the shift position of pressure inductor 7 is for can close the C hole.

Because hydraulic means with and on operating oil tank, oil pump, operating cylinder etc. be known equipment, do not do too much description at this, do not recommend accompanying drawing yet.

The operation principle of control valve when being described in the different operating state respectively below:

State 1: standby recurrent state

Oil pump running when hydraulic machinery, when joystick is not depressed, hydraulic oil enters control valve by the B hole on the valve pocket, and return fuel tank by less draining hole A, produce certain draining pressure simultaneously, promote pressure inductor compression spring and move, and under the position-limiting action of stop, its side-closed is led to the C hole of hydraulic machinery operating cylinder to stop.Machinery is in the standby starting state, does not have hydraulic oil to enter operating cylinder, and machinery is failure to actuate.Mechanism's state of this moment as shown in Figure 3.

State 2: oiling duty

When the oil pump running of hydraulic machinery, when joystick was depressed, multidiameter further compressed spring, moved to the spring direction, and the side-closed of the thick section of multidiameter is led to the A hole of fuel tank.The hydraulic oil that enters control valve by the B hole enters operating cylinder by the C hole, machinery beginning operation.Mechanism's state of this moment as shown in Figure 4.

State 3: shutdown oil sealing state

When hydraulic machinery in operation process, oil pump shuts down suddenly, and joystick is not when unclamping, pressure inductor moves to the direction in multidiameter stage casing under the effect of spring, and stopped by the shaft shoulder in multidiameter stage casing is spacing, the side-closed of pressure inductor is communicated with the C hole of operating cylinder, the hydraulic oil that has entered operating cylinder is closed in the operating cylinder, machinery can't be under the effect of its resetting means, discharge the hydraulic oil in the operating cylinder, machinery can't return to original position (action component of machinery stops action), and the configuration state of this moment as shown in Figure 5.

State 4: standby oil sealing state

When hydraulic machinery in operation process, joystick is released suddenly, and oil pump is when still remaining in operation, spring promotes pressure inductor, and further promotes multidiameter and move to the direction of joystick and reset, and opens the A hole that is communicated with fuel tank.The trigger of spring leaf promotion simultaneously resets and locks joystick again.Hydraulic oil returns fuel tank by less draining hole A, draining pressure continues compressive pressure inductor compression spring, and keep in touch with stop, the side-closed of pressure inductor is communicated with the C hole of operating cylinder, the hydraulic oil that has entered operating cylinder is closed in the operating cylinder, and machinery can't be discharged the hydraulic oil in the operating cylinder under the effect of its resetting means, machinery can't return to original position (action component of machinery stops action), and the configuration state of this moment as shown in Figure 6.

State 5: shutdown draining state

When the oil pump of hydraulic machinery cuts out, joystick unclamps when resetting, spring promotes the direction of pressure inductor to the multidiameter stage casing and moves, and stopped by the shaft shoulder in multidiameter stage casing is spacing, the C hole that is communicated with operating cylinder is left in the side of pressure inductor, spring further promotes multidiameter and moves to the direction of joystick and reset, and spring leaf promotes trigger and resets and lock joystick again simultaneously.Under the pressure effect of mechanical return mechanism, the hydraulic oil in the operating cylinder is discharged from the C hole, returns fuel tank by the D hole.Machinery recovers the initialization state.The configuration state of this moment as shown in Figure 7.

Embodiment 2, hydro-mechanical unit of a great variety, the portable hydraulic timber fish gutting machine that has often requires control valve mechanism to be installed in end cap inside, and end cap the rectangle cross section of closed fuel tank and the circular cross-section of operating cylinder simultaneously.In order to reduce the complete machine size, operating cylinder often is sleeved in the fuel tank chamber.The not enough 70mm of the width of minimum portable fish gutting machine end cap simultaneously, in order to guarantee operating efficiency, requires to be not less than 10mm into and out of the diameter of oilhole.Present embodiment is exactly the basic functional principle of describing according to summary of the invention and embodiment 1, and control valve is done equivalent variations, has promptly satisfied the requirement of using on this type of portable timber fish gutting machine.

Please in conjunction with Fig. 8, its joystick is not change partly, and two valve bodies that just are arranged in parallel are respectively upper valve body 18 and following valve body 19.Installing back-moving spring 14 and multidiameter 5 in the upper valve body 18, this spring 14 is replaced the top of multidiameter 5.The stage casing 504 of this multidiameter 5 is a thin segment, and top 505 and middle part 506 are thick section, are a dumbbell shaped.Be communicated with the A hole of fuel tank on this multidiameter 5 and the upper valve body 18 and be communicated with the C1 hole of operating cylinder, the corresponding relation in C2 hole is: when joystick 2 does not press down, multidiameter 5 is subjected to replacing of back-moving spring 14, the thick section 505 sealing C1 hole on multidiameter 5 tops, the valve port of the thick section 506 sealing upper valve body 18 at multidiameter 5 middle parts; When multidiameter 5 controlled handles 2 are oppressed, the thick section 506 sealing A hole at multidiameter 5 middle parts, the butt end 505 sealing C2 holes on top.

Be equiped with spring 10, stop 9 and pressure inductor 7 in the following valve body 19, spring 10 is replaced pressure inductor 7.When oil pump did not turn round, owing to do not have pressure, pressure inductor 7 replaced by spring 10, sealing is the oil pump oil-out B hole of valve body 19 down.When oil pump turns round, contract in the inductor 7, and limited device 9 supports only spacing.

With two pipeline connections, for sake of convenience, be referred to as A pipeline 12 and B pipeline 13 respectively between upper valve body 18 and the following valve body 19.A pipeline 12 on the upper valve body 18 between A hole and C1 hole, its other end is positioned at down valve body 19 ports.B pipeline 13 is positioned on the upper valve body 18 place, C2 hole, and its other end is positioned at the inner of valve body 19 down and after stop 9.

The operation principle of control valve when the different operating state that embodiment 2 describes described respectively below:

State 1: standby recurrent state

When the running of the oil pump of hydraulic machinery, when joystick is not depressed, hydraulic oil by the compressing of oil pump oil-out down the pressure inductor in the valve body make and contract in it, and limited device is spacing stops sealing B pipeline.Hydraulic oil enters fuel tank through A pipeline, upper valve body and A hole.Simultaneously, because the multidiameter in the upper valve body is replaced by back-moving spring, the thick section sealing on this multidiameter top is communicated with the C1 hole of operating cylinder, do not have hydraulic oil to enter operating cylinder, and machinery is failure to actuate.Mechanism's state of this moment is (the arrow lines among the figure are represented the flow direction of hydraulic oil) as shown in Figure 9.

State 2: oiling duty

When the oil pump running of hydraulic machinery, when joystick was depressed, the multidiameter compression reseting spring in the upper valve body moved to the spring direction, and the A hole of fuel tank is led in the thick section sealing at multidiameter middle part, and the thick section sealing on its top is communicated with the C2 hole of operating cylinder.The hydraulic oil that enters control valve by the B hole enters operating cylinder by the C1 hole, machinery beginning operation.Inductor in the following valve body still is in state 1.Mechanism's state of this moment as shown in figure 10.

State 3: shutdown oil sealing state

When hydraulic machinery in operation process, oil pump shuts down suddenly, and joystick is not when unclamping, the pressure inductor in the following valve body under the effect of spring downwards valve B hole direction move and sealing B hole.The hydraulic oil that has entered operating cylinder is closed in the operating cylinder, machinery can't be under the effect of its resetting means, discharge the hydraulic oil in the operating cylinder, machinery can't return to original position (action component of machinery stops action), and the configuration state of this moment as shown in figure 11.Owing to do not have this moment hydraulic oil to flow, so there are not the arrow lines to represent among the figure.

State 4: standby oil sealing state

When hydraulic machinery in operation process, joystick unclamps suddenly, and this moment, oil pump still remained in operation, back-moving spring in the upper valve body promotes multidiameter and moves to the direction of joystick and reset, open the A hole that is communicated with fuel tank, sealing C1 hole, the spring leaf promotion trigger on the joystick resets and locks joystick again simultaneously.Hydraulic oil returns fuel tank by the A hole, the hydraulic oil that has entered operating cylinder is enclosed in the operating cylinder by thick section of multidiameter top, machinery can't be under the effect of its resetting means, discharge the hydraulic oil in the operating cylinder, machinery can't return to original position (action component of machinery stops action), and the configuration state of this moment as shown in figure 12.

State 5: shutdown draining state

When the oil pump of hydraulic machinery cuts out, when joystick unclamped, the spring in the following valve body promoted the downward valve B of pressure inductor hole direction and moves, and sealing B hole.Back-moving spring in the upper valve body promotes multidiameter and moves to the direction of joystick and reset, and spring leaf promotes trigger and resets and lock joystick again simultaneously.Under the pressure effect of resetting-mechanism, the hydraulic oil in the operating cylinder is discharged from the C2 hole, returns fuel tank through B pipeline, following valve body, A pipeline, upper valve body by the A hole.Machinery recovers the initialization state.The configuration state of this moment as shown in figure 13.

From the above description as can be seen, in the control valve that the utility model provides, before trigger was not pulled, joystick can't be depressed, and had guaranteed that this hand control position can't be by other parts manipulations of the health except hand.

Above-mentioned control valve compact conformation, accessory size can change and not influence function according to required supporting mechanical size, and part processing is simple, and cost is low, the control of very suitable small-sized hydraulic machinery.Figure 14 is used for the schematic perspective view of an example on the hydraulic machinery for the utility model.

Claims (6)

1, a kind of trigger type double-action control-valve is used for realizing control by the ON/OFF of oil pump on the hydraulic machinery and the double cropping of depressing/resetting of operating grip, mainly forms by handle control section and valve body two parts, wherein,

The handle control section has:

The one handle mount pad is blocks, is fixed on the hydraulic machinery body, and a projection that is del is arranged in this mount pad, and also be provided with on the same side: a through hole is arranged at its top; Its underpart and the corresponding opposite side of inverted triangle projection have a cylinder shape groove, and a stop block is arranged under the groove;

One joystick, respectively there is a through hole at its top and middle part, and with mount pad on through hole in the same way;

One trigger is a flute profile, and its upper end direction outside groove has a bead, and respectively there is a coaxial through hole at the last angle of two trough rims;

Joystick is embedded in the groove of trigger, with the through hole of pivot pin by trigger and handle middle part, with the rotatable certain angle of trigger be fixed on the handle end of the affixed spring leaf in handle bottom, the other end of its spring leaf is resisted against in the trigger groove, and trigger is not resetted when having external force;

With pivot pin by on the joystick with the handle mount pad on through hole fix, make handle rotatably movable on mount pad;

Because the bead on the trigger props up the stop block on the mount pad, projection and trigger that handle is mounted on the seat limit and can't move forward and backward; When pulling trigger, handle can be passed LAP forward;

Valve body includes:

A multidiameter is carse, medium and small three sections and form two shaft shoulders, and wherein there is a groove at place, the end limit of thin segment;

A pressure inductor is set on the thin segment of multidiameter, and limits its shift position by a stop that is arranged on the thin segment groove;

One spring is sheathed on the thin segment of multidiameter and is resisted against pressure inductor;

One valve pocket, ccontaining above-mentioned multidiameter and spring, thick section of its multidiameter stretches out in valve pocket;

Valve body is inserted in the cylinder shape groove on the mount pad, and thick section of multidiameter that stretches out in valve pocket is resisted against joystick;

Offer 4 oilholes on the valve pocket, be respectively two A hole and D holes that connect the fuel tank of hydraulic machinery, a B hole that connects hydraulic machinery oil pump oil-out, a C hole that connects the hydraulic machinery operating cylinder; Described each oilhole offer spacing and each section of multidiameter is arranged to: when depressing joystick, thick section of multidiameter sealing A hole, and sealing C hole, the shift position of pressure inductor.

2, control valve as claimed in claim 1 is characterized in that, described valve body includes:

Two valve pockets that are arranged in parallel are respectively upper valve body and following valve body;

Installing back-moving spring and multidiameter in the upper valve body, this spring is replaced the top of multidiameter, and the stage casing of this multidiameter is a thin segment, and top and middle part are thick section; The C1 hole, two holes, the C2 that are communicated with the A hole of fuel tank on this multidiameter and the upper valve body and are communicated with operating cylinder are arranged between the hole: when joystick is not depressed, multidiameter is subjected to replacing of back-moving spring, the thick section sealing C1 hole on multidiameter top, the valve port of the thick section sealing upper valve body at multidiameter middle part; When the controlled handle of multidiameter is oppressed, the thick section sealing A hole at multidiameter middle part, the butt end sealing C2 hole on top;

Be equiped with spring, stop and pressure inductor in the following valve body, spring is placed in the stop and replaces pressure inductor; When oil pump did not turn round, pressure inductor was replaced by spring, and sealing valve body down connects the fuel-displaced B hole of oil pump; During the oil pump running, contract in the inductor, and limited device supports only spacing;

Be communicated with two pipeline A and B between upper valve body and the following valve body, the A pipeline on the upper valve body between A hole and C1 hole, its other end is positioned at down valve body near the port; The B pipeline is positioned on the upper valve body place, C2 hole, and its other end is positioned at the inner of valve body down and after stop.

3, control valve as claimed in claim 1 is characterized in that, described handle mount pad is made up of two same sizes and the involutory plate body of shape.

4, control valve as claimed in claim 1 is characterized in that, the one sheet material of described handle mount pad for forming through milling.

5, control valve as claimed in claim 1 or 2 is characterized in that, described joystick is slightly curved shape.

6, as claim 1,2 or 3 described control valves, it is characterized in that, the bottom of described joystick have one with mount pad on the vertical through hole of direction of through hole, affixed with spring leaf.

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