CN108843642B - Electromagnetic valve for movable arm oil cylinder of excavator - Google Patents
Electromagnetic valve for movable arm oil cylinder of excavator Download PDFInfo
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- CN108843642B CN108843642B CN201810785274.4A CN201810785274A CN108843642B CN 108843642 B CN108843642 B CN 108843642B CN 201810785274 A CN201810785274 A CN 201810785274A CN 108843642 B CN108843642 B CN 108843642B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
Abstract
The invention provides an electromagnetic valve for a movable arm oil cylinder of an excavator, which comprises: the valve comprises a valve seat, a valve sleeve, a main valve core, a first spring, a valve body and a two-position three-way electromagnetic stop valve. The electromagnetic valve for the movable arm oil cylinder of the excavator, provided by the embodiment of the invention, has the advantages of reasonable structure, compact volume and low manufacturing cost, and can ensure that the movable arm oil cylinder can be reliably locked without sliding down, and the movable arm oil cylinder can not be lowered even if an oil pipe of the movable arm oil cylinder bursts.
Description
Technical Field
The invention relates to an electromagnetic valve, in particular to an electromagnetic valve for a movable arm oil cylinder of an excavator.
Background
In a conventional hydraulic excavator, a boom hydraulic cylinder is directly connected to a boom control valve, and the boom control valve controls the raising, lowering, and holding of a boom. After the hydraulic excavator lifts the bucket off the ground, the reversing valve of the hydraulic cylinder of the movable arm or the bucket rod is controlled to temporarily return to the middle position for various reasons, and the engine is in an idling state at the moment. When the bucket is filled with material or a heavy object is lifted by the hook on the bucket, the automatic lowering of the working device often leads to accidents. Meanwhile, when the oil pipe bursts, the movable arm suddenly drops, and potential safety hazards exist.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, an object of the present invention is to provide an electromagnetic valve that can maintain a boom at a home position without lowering when a boom manipulating lever of an excavator returns to a neutral position, and does not cause the boom to sink suddenly when an oil pipe of a boom cylinder bursts.
According to an embodiment of the present invention, an electromagnetic valve for a boom cylinder of an excavator includes:
the valve seat is provided with a valve seat blind hole with an upward opening, the bottom of the valve seat is provided with an oil port A communicated with the valve seat blind hole, and the side wall of the valve seat is provided with an oil port B communicated with the valve seat blind hole;
the lower end of the valve sleeve is matched in the valve seat blind hole, the lower end face of the valve sleeve is positioned above the oil port B, the valve sleeve is provided with a valve sleeve blind hole with a downward opening, the valve sleeve blind hole comprises a sliding hole section and a connecting hole section positioned above the sliding hole section, the aperture of the sliding hole section is larger than that of the connecting hole section, an annular first through flow groove is formed in the side wall of the upper end of the valve sleeve, and a first through flow hole used for communicating the first through flow groove with the sliding hole section is formed in the valve sleeve;
the main valve core comprises a main body section, a support section and a connecting section, wherein the main body section can be matched in the sliding hole section in a vertically movable mode, the support section is positioned below the main body section, the connecting section is positioned above the main body section, the outer diameter of the main body section is equal to the aperture of the sliding hole section, the outer diameter of the connecting section is equal to the aperture of the connecting hole section, the upper end of the connecting section can be matched in the lower end of the connecting hole section in a vertically movable mode, the outer diameter of the support section is smaller than the outer diameter of the connecting section, a first control cavity is defined between the connecting section and the connecting hole section, a second control cavity is defined among the main body section, the connecting section and the sliding hole section, a damping hole communicated with the oil port B is formed in the main valve core, and a stepped second through hole used for communicating the damping hole with the first control cavity is further formed in the main valve core;
the first spring is arranged in a first control cavity, the upper end of the first spring abuts against the valve sleeve, the lower end of the first spring abuts against the step of the second through-flow hole, and the first spring pushes the main valve core downwards to enable the lower end face of the support section to close the oil port A;
the valve body is provided with a valve body blind hole with a downward opening, the upper end of the valve seat is matched with the lower end of the valve body blind hole so that the valve sleeve is accommodated in the valve body blind hole, the valve body is provided with a mounting hole communicated with the upper end of the valve body blind hole, the side wall of the valve body is provided with an oil port T, the valve body is further provided with a first flow channel, and one end of the first flow channel is communicated with the first through-flow groove;
two-position three-way electromagnetic stop valve, two-position three-way electromagnetic stop valve fixed connection be in the mounting hole, be equipped with on the two-position three-way electromagnetic stop valve with the communicating hydraulic fluid port D of first control chamber, with the communicating hydraulic fluid port T1 of hydraulic fluid port T and with the communicating hydraulic fluid port C of first runner other end, work as two-position three-way electromagnetic stop valve is not electrified hydraulic fluid port C and hydraulic fluid port D are linked together just hydraulic fluid port T1 with hydraulic fluid port C hydraulic fluid port D is everywhere not communicated with each other, works as when two-position three-way electromagnetic stop valve is electrified, hydraulic fluid port C is linked together just with hydraulic fluid port T1 hydraulic fluid port D with hydraulic fluid port C, hydraulic fluid port T1 are everywhere not communicated with each other.
Advantageously, the first flow passage comprises a first transverse hole, a first vertical hole and a second transverse hole which are connected in sequence, one end of the first transverse hole is communicated with the first through flow groove, the other end of the first transverse hole is communicated with one end of the first vertical hole, the other end of the first vertical hole is communicated with one end of the second transverse hole, and the other end of the second transverse hole is communicated with the oil port C.
Advantageously, the two-position three-way electromagnetic stop valve includes a flux sleeve, a coil, an armature, a push rod, a first pilot valve seat, a second pilot valve seat, a conical valve spool, a second spring and a spring seat, the first pilot valve seat is fixedly arranged on the valve body, the first pilot valve seat has a through hole which is through up and down, the lower end of the through hole has a step portion, the aperture of the step portion is larger than that of the through hole, an oil port T1 which is positioned above the step portion and is communicated with the through hole is arranged on the side wall of the first pilot valve seat, an oil port C which is communicated with the step portion is arranged on the side wall of the first pilot valve seat, the second pilot valve seat is arranged in the step portion and is positioned below the oil port C, the second pilot valve seat is hollow and is provided with an oil port D at the lower end thereof, the conical valve spool is vertically movably matched in the through hole, and the lower end of the conical valve spool has a first pilot valve seat which is matched with the first pilot valve seat to close the oil port C and the T1 communication The conical valve core is provided with a second conical surface which is matched with a second pilot valve seat at the lower end of the first conical surface to close the communication between the oil port C and the oil port D, the side wall of the conical valve core is provided with an avoiding part avoiding the oil port T1, the upper end of the conical valve core upwards extends out of the upper end of the first pilot valve seat, the spring seat is fixed at the upper end of the conical valve core outside the first pilot valve seat, the second spring is sleeved on the conical valve core, the upper end of the second spring abuts against the spring seat, the lower end of the second spring abuts against the first pilot valve seat, the magnetic conduction sleeve is arranged on the valve body, the upper end of the first pilot valve seat is matched in the lower end of the magnetic conduction sleeve, the push rod vertically penetrates through the magnetic conduction sleeve, the lower end of the push rod abuts against the upper end of the conical valve core, and the upper end of the push rod upwards extends out of the upper end face of the magnetic conduction sleeve, the coil is sleeved on the magnetic guide sleeve, the armature is arranged in the magnetic guide sleeve in a vertically movable mode, the lower end of the armature abuts against the upper end of the push rod, when the coil is powered off, the second spring pushes the cone valve core upwards to enable the first conical surface to abut against the step part, so that the lower end of the through hole is closed to close the communication between the oil port C and the oil port T1, the cone valve core pushes the push rod upwards and drives the armature to move upwards, when the coil is powered on, the armature moves downwards, the push rod is pushed downwards to enable the cone valve core to overcome the elastic force of the second spring to move downwards, the first conical surface is enabled to leave the step part downwards to open the lower end of the through hole, and the second conical surface abuts against the second pilot valve seat downwards to close the communication between the oil port C and the oil port D.
Advantageously, the valve sleeve is provided with a third through-flow hole for communicating the blind hole of the valve sleeve with the mounting hole.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a structural view of a solenoid valve for a boom cylinder of an excavator according to one embodiment of the present invention;
fig. 2 is a structural view of a two-position three-way electromagnetic cut-off valve of an electromagnetic valve for a boom cylinder of an excavator according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An electromagnetic valve for a boom cylinder of an excavator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 2, an electromagnetic valve for a boom cylinder of an excavator according to an embodiment of the present invention includes: the valve comprises a valve seat 1, a valve sleeve 3, a main valve core 2, a first spring 4, a valve body 5 and a two-position two-way pilot electromagnetic valve 6.
Specifically, the valve seat 1 is provided with a valve seat blind hole with an upward opening, the bottom of the valve seat 1 is provided with an oil port A communicated with the valve seat blind hole, and the side wall of the valve seat 1 is provided with an oil port B communicated with the valve seat blind hole.
The cooperation of the lower extreme of valve barrel 3 is in the disk seat blind hole just the lower terminal surface of valve barrel 3 is located the higher authority of hydraulic fluid port B, the valve barrel blind hole that has the opening decurrent on 3, the valve barrel blind hole includes the sliding hole section and is located the connecting hole section above the sliding hole section, the aperture of sliding hole section is greater than the aperture of connecting hole section, be equipped with annular first through-flow groove 32 on the lateral wall of valve barrel 3 upper end, be equipped with on the valve barrel 3 and be used for the intercommunication first through-flow groove 32 with the first through-flow hole 31 of sliding hole section.
A first spring 4 is arranged in the first control chamber 3a, the upper end of the first spring 4 abuts against the valve sleeve 3 and the lower end of the first spring 4 abuts against the step of the second through-flow hole 22, and the first spring 4 pushes the main valve element 2 downwards to enable the lower end surface of the support section to close the oil port a.
Valve body 5 has the valve body blind hole that the opening is decurrent, the upper end cooperation of disk seat 1 is in the lower extreme of valve body blind hole is in order to make valve barrel 3 holds in the valve body blind hole, be equipped with on the valve body 5 with the communicating mounting hole in valve body blind hole upper end, be equipped with hydraulic fluid port T on the lateral wall of valve body 5, still be equipped with first flow channel 51 on the valve body 5, first flow channel 51 is including the first cross bore 511, first perpendicular hole 512 and the second cross bore 513 that connect gradually, and first cross bore 511 one end communicates with each other with first through-flow groove 32, and the first cross bore 511 other end communicates with each other with first perpendicular hole 512 one end, and the first perpendicular hole 512 other end communicates with each other with second cross bore 513 one end. And a third through-flow hole 33 for communicating the valve sleeve blind hole with the mounting hole is formed in the valve sleeve 3.
Two-position three-way electromagnetic stop valve 6 fixed connection be in the mounting hole, be equipped with on two-position three-way electromagnetic stop valve 6 with the communicating hydraulic fluid port D of first control chamber 3a, with the communicating hydraulic fluid port T1 of hydraulic fluid port T and with the communicating hydraulic fluid port C of second cross bore 513 other end, work as two-position three-way electromagnetic stop valve 6 is not electrified hydraulic fluid port C and hydraulic fluid port D are linked together just hydraulic fluid port T1 with hydraulic fluid port C hydraulic fluid port D is everywhere not communicated with each other, works as when two-position three-way electromagnetic stop valve 6 is electrified, hydraulic fluid port C is linked together just with hydraulic fluid port T1 hydraulic fluid port D with hydraulic fluid port C, hydraulic fluid port T1 are everywhere not communicated with each other. Specifically, the two-position three-way electromagnetic stop valve 6 includes a magnetic conductive sleeve 61, a coil 64, an armature 62, a push rod 63, a first pilot valve seat 65, a second pilot valve seat 66, a cone valve core 67, a second spring 68 and a spring seat 69, the first pilot valve seat 65 is fixedly arranged on the valve body 5, the first pilot valve seat 65 has a through hole which is through up and down, the lower end of the through hole has a step portion, the aperture of the step portion is larger than that of the through hole, an oil port T1 which is positioned above the step portion and is communicated with the through hole is arranged on the side wall of the first pilot valve seat 65, an oil port C which is communicated with the step portion is arranged on the side wall of the first pilot valve seat 65, the second pilot valve seat 66 is arranged in the step portion and is positioned below the oil port C, the second pilot valve seat 66 is hollow and is provided with a D at the lower end thereof, the cone valve core 67 is vertically movably matched in the through hole, a fourth through hole 671 is axially arranged in the conical valve core 67, a first conical surface 672 matched with the first pilot valve seat 65 to close the communication between the oil port C and the oil port T1 is arranged at the lower end of the conical valve core 67, a second conical surface 673 matched with the second pilot valve seat 66 to close the communication between the oil port C and the oil port D is further arranged at the lower end of the first conical surface 672 on the conical valve core 67, an avoiding part for avoiding the oil port T1 is arranged on the side wall of the conical valve core 67, the upper end of the conical valve core 67 extends upwards out of the upper end of the first pilot valve seat 65, the spring seat 69 is fixed outside the first pilot valve seat 65 at the upper end of the conical valve core 67, the second spring 68 is sleeved on the conical valve core 67, the upper end of the second spring 68 abuts against the spring seat 69 and the lower end of the second spring 68 abuts against the first pilot valve seat 65, the magnetic sleeve 61 is arranged on the valve body 5, the upper end of the first pilot valve seat 65 is fitted in the lower end of the magnetic conductive sleeve 61, the push rod 63 vertically penetrates through the magnetic conductive sleeve, the lower end of the push rod 63 abuts against the upper end of the conical valve element 67, the upper end of the push rod 63 upwards extends out of the upper end surface of the magnetic conductive sleeve 61, the coil 64 is sleeved on the magnetic conductive sleeve 61, the armature 62 is arranged in the magnetic conductive sleeve 61 in a vertically movable manner, the lower end of the armature 62 abuts against the upper end of the push rod 63, when the coil 64 is de-energized, the second spring 68 upwards pushes the conical valve element 67 to enable the first conical surface 672 to abut against the step part, so that the lower end of the through hole is closed to close the communication between the oil port C and the oil port T1, the conical valve element 67 upwards pushes the push rod 63 and drives the armature 62 to upwards move, when the coil 64 is energized, the armature 62 downwards moves to push the push rod 63 to enable the conical valve element 67 to overcome the elasticity of the second spring 68 to downwards move, the lower end of the through hole is opened by separating the first tapered surface 672 downward from the stepped portion, and the second tapered surface 673 abuts downward against the second pilot valve seat 66 to close the communication between the ports C and D.
When the hydraulic oil return device is used, the hydraulic oil return device is directly connected into a jack of a movable arm oil cylinder of an excavator in a threaded manner, an oil port B is connected with a rodless cavity of the movable arm oil cylinder, an oil port A is connected with an outlet of a movable arm control multi-way valve, and an oil port T is directly connected back to an oil tank.
When the two-position three-way electromagnetic stop valve 6 is not powered, the first control cavity 3a is communicated with the second control cavity 3B after sequentially passing through the third through-flow hole 33, the oil port D, the oil port C, the first flow passage 51, the first through-flow groove 32 and the first through-flow hole 31, at this time, if the movable arm controls the multi-way valve to reverse and control the movable arm oil cylinder to ascend, oil enters the oil port a from the outlet of the movable arm control multi-way valve, the main valve element 2 is pushed to move upwards to overcome the acting force of the first spring 4 to open the valve port (equivalent to the function of a one-way valve), and the oil enters the oil port B from the oil port a to push the movable arm oil cylinder to ascend. If the movable arm control multi-way valve is located at the middle position at the moment, oil of the oil port B enters the first control cavity 3a and the second control cavity 3B, resultant force of pressure of the oil port B acting on the main valve core 2 is downward, the main valve core 2 closes the valve port under the pressure of the oil port B and acting force of the first spring 4, the oil port A is not communicated with the oil port B, and the oil of the movable arm oil cylinder cannot sink because the supporting section of the main valve core 2 and the valve seat 1 are sealed in a conical mode and the two-position three-way electromagnetic stop valve 6 is sealed in the conical mode.
When the movable arm control multi-way valve reverses to control the movable arm oil cylinder to descend, only the two-position three-way electromagnetic stop valve 6 needs to be electrified, the oil in the second control chamber 3B sequentially passes through the first through-flow hole 31, the first through-flow groove 32, the first flow passage 51, the oil port C, and the oil port T and then returns to the oil tank, at this time, the stress of the main valve element 2 changes, the area of the upward pushing action of the pressure of the oil port B on the main valve element 2 is the annular area formed by the main body section and the support section of the main valve element 2, the area of the downward pushing action of the pressure of the oil port B on the main valve element 2 is the diameter area of the connecting section of the main valve element 2, and the annular area is larger than the diameter area of the connecting section, therefore, the oil port B generates an upward resultant force on the main valve element 2, the resultant force overcomes the acting force of the first spring 4 to push the main valve element 2 to move upward to open the valve port, the oil flows into the oil port a from the oil port B, and the boom cylinder starts to descend.
In summary, the electromagnetic valve for the boom cylinder of the excavator according to the embodiment of the present invention has the following advantages:
(1) the device is designed in a plug-in mounting mode, and has the advantages of compact volume, simple structure and low overall cost.
(2) The main valve core 2 and the two-position three-way electromagnetic stop valve 6 are both designed in a cone seal mode, and therefore leakage and sinking of a movable arm oil cylinder can be avoided.
(3) For descending control of the movable arm oil cylinder, only the two-position three-way electromagnetic stop valve 6 needs to be controlled to be electrified, external pilot control oil is not needed, and an oil path is simpler and more energy-saving.
(4) The invention is integrally screwed and inserted in the jack on the movable arm cylinder, even if the external oil pipe bursts, the main valve core 2 can lock the pressure of the oil port B, and the movable arm cylinder does not sink fast to cause accidents.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although the embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the embodiments without departing from the scope of the present invention.
Claims (4)
1. An electromagnetic valve for a boom cylinder of an excavator, comprising:
the valve seat is provided with a valve seat blind hole with an upward opening, the bottom of the valve seat is provided with an oil port A communicated with the valve seat blind hole, and the side wall of the valve seat is provided with an oil port B communicated with the valve seat blind hole;
the lower end of the valve sleeve is matched in the valve seat blind hole, the lower end face of the valve sleeve is positioned above the oil port B, the valve sleeve is provided with a valve sleeve blind hole with a downward opening, the valve sleeve blind hole comprises a sliding hole section and a connecting hole section positioned above the sliding hole section, the aperture of the sliding hole section is larger than that of the connecting hole section, an annular first through flow groove is formed in the side wall of the upper end of the valve sleeve, and a first through flow hole used for communicating the first through flow groove with the sliding hole section is formed in the valve sleeve;
the main valve core comprises a main body section, a support section and a connecting section, wherein the main body section can be matched in the sliding hole section in a vertically movable mode, the support section is positioned below the main body section, the connecting section is positioned above the main body section, the outer diameter of the main body section is equal to the aperture of the sliding hole section, the outer diameter of the connecting section is equal to the aperture of the connecting hole section, the upper end of the connecting section can be matched in the lower end of the connecting hole section in a vertically movable mode, the outer diameter of the support section is smaller than the outer diameter of the connecting section, a first control cavity is defined between the connecting section and the connecting hole section, a second control cavity is defined among the main body section, the connecting section and the sliding hole section, a damping hole communicated with the oil port B is formed in the main valve core, and a stepped second through hole used for communicating the damping hole with the first control cavity is further formed in the main valve core;
the first spring is arranged in a first control cavity, the upper end of the first spring abuts against the valve sleeve, the lower end of the first spring abuts against the step of the second through-flow hole, and the first spring pushes the main valve core downwards to enable the lower end face of the support section to close the oil port A;
the valve body is provided with a valve body blind hole with a downward opening, the upper end of the valve seat is matched with the lower end of the valve body blind hole so that the valve sleeve is accommodated in the valve body blind hole, the valve body is provided with a mounting hole communicated with the upper end of the valve body blind hole, the side wall of the valve body is provided with an oil port T, the valve body is further provided with a first flow channel, and one end of the first flow channel is communicated with the first through-flow groove;
two-position three-way electromagnetic stop valve, two-position three-way electromagnetic stop valve fixed connection be in the mounting hole, be equipped with on the two-position three-way electromagnetic stop valve with the communicating hydraulic fluid port D of first control chamber, with the communicating hydraulic fluid port T1 of hydraulic fluid port T and with the communicating hydraulic fluid port C of first runner other end, work as two-position three-way electromagnetic stop valve is not electrified hydraulic fluid port C and hydraulic fluid port D are linked together just hydraulic fluid port T1 with hydraulic fluid port C hydraulic fluid port D is everywhere not communicated with each other, works as when two-position three-way electromagnetic stop valve is electrified, hydraulic fluid port C is linked together just with hydraulic fluid port T1 hydraulic fluid port D with hydraulic fluid port C, hydraulic fluid port T1 are everywhere not communicated with each other.
2. The electromagnetic valve for the oil cylinder of the boom of the excavator according to claim 1, wherein the first flow passage comprises a first cross hole, a first vertical hole and a second cross hole which are connected in sequence, one end of the first cross hole is communicated with the first through flow groove, the other end of the first cross hole is communicated with one end of the first vertical hole, the other end of the first vertical hole is communicated with one end of the second cross hole, and the other end of the second cross hole is communicated with the oil port C.
3. The electromagnetic valve for the excavator boom cylinder according to claim 1, wherein the two-position three-way electromagnetic stop valve comprises a flux sleeve, a coil, an armature, a push rod, a first pilot valve seat, a second pilot valve seat, a cone valve spool, a second spring and a spring seat, the first pilot valve seat is fixedly arranged on the valve body, the first pilot valve seat is provided with a through hole which is through up and down, the lower end of the through hole is provided with a step portion, the aperture of the step portion is larger than that of the through hole, the side wall of the first pilot valve seat is provided with an oil port T1 which is arranged above the step portion and is communicated with the through hole, the side wall of the first pilot valve seat is provided with an oil port C which is communicated with the step portion, the second pilot valve seat is arranged in the step portion and is arranged below the oil port C, the second pilot valve seat is hollow and is formed with an oil port D at the lower end thereof, the conical valve core is matched in the through hole in a vertically movable manner, the lower end of the conical valve core is provided with a first conical surface which is matched with a first pilot valve seat to close the communication between the oil port C and the oil port T1, the lower end of the first conical surface on the conical valve core is also provided with a second conical surface which is matched with a second pilot valve seat to close the communication between the oil port C and the oil port D, the side wall of the conical valve core is provided with an avoidance part which avoids the oil port T1, the upper end of the conical valve core upwards extends out of the upper end of the first pilot valve seat, the spring seat is fixed at the upper end of the conical valve core outside the first pilot valve seat, the second spring is sleeved on the conical valve core, the upper end of the second spring abuts against the spring seat, the lower end of the second spring abuts against the first pilot valve seat, the magnetic conduction sleeve is arranged on the valve body, and the upper end of the first pilot valve seat is matched in the lower end of the magnetic conduction sleeve, the push rod vertically penetrates through the magnetic conductive sleeve, the lower end of the push rod abuts against the upper end of the cone valve core, the upper end of the push rod upwards extends out of the upper end face of the magnetic conductive sleeve, the coil is sleeved on the magnetic conductive sleeve, the armature is arranged in the magnetic conductive sleeve in a vertically movable mode, the lower end of the armature abuts against the upper end of the push rod, when the coil is de-energized, the second spring upwards pushes the cone valve core to enable the first conical surface to abut against the step part so as to seal the lower end of the through hole and close the communication between the oil port C and the oil port T1, the cone valve core upwards pushes the push rod and drives the armature to upwards move, when the coil is energized, the armature downwards moves, the push rod is downwards pushed down to enable the cone valve core to downwards move against the elastic force of the second spring, and the first conical surface downwards leaves the step part so as to open the lower end of the through hole, and enabling the second conical surface to abut against the second pilot valve seat downwards to close the communication of the oil port C and the oil port D.
4. The electromagnetic valve for the cylinder of the boom of the excavator as claimed in claim 1, wherein said valve housing is provided with a third through-flow hole for communicating said blind hole of the valve housing with said mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810785274.4A CN108843642B (en) | 2018-07-17 | 2018-07-17 | Electromagnetic valve for movable arm oil cylinder of excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810785274.4A CN108843642B (en) | 2018-07-17 | 2018-07-17 | Electromagnetic valve for movable arm oil cylinder of excavator |
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| CN108843642A CN108843642A (en) | 2018-11-20 |
| CN108843642B true CN108843642B (en) | 2021-12-07 |
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| CN201810785274.4A Active CN108843642B (en) | 2018-07-17 | 2018-07-17 | Electromagnetic valve for movable arm oil cylinder of excavator |
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| KR101384177B1 (en) * | 2012-07-16 | 2014-04-10 | 주식회사 지더블유 | Electronic Proportional Pressure Reducing Valve |
| CN102767207B (en) * | 2012-08-06 | 2014-09-17 | 徐工集团工程机械股份有限公司 | Excavator boom energy regenerating device and boom energy regenerating valve block thereof |
| DE102013014452A1 (en) * | 2013-08-30 | 2015-03-05 | Hydac Fluidtechnik Gmbh | valve device |
| CN105840576A (en) * | 2016-05-18 | 2016-08-10 | 山东常林机械集团股份有限公司 | Electrically controlled reversing valve |
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2018
- 2018-07-17 CN CN201810785274.4A patent/CN108843642B/en active Active
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