WO2017097267A1

WO2017097267A1 - Electromagnetic directional control valve

Info

Publication number: WO2017097267A1
Application number: PCT/CN2016/111378
Authority: WO
Inventors: 王小康; 岳烨冬; 盛建新
Original assignee: 常州市康士达机电有限公司
Priority date: 2015-12-07
Filing date: 2016-12-21
Publication date: 2017-06-15
Also published as: CN105422914B; CN105422914A

Abstract

An electromagnetic directional control valve comprises a valve body (1), a valve spool (2), a valve body end cover (3), and an electromagnet assembly (4). The valve body (1) comprises a valve body main hole (1-8). One end of the valve spool (2) is sleeved with a spring seat (6). Two ends of the valve spool (2) are provided with third and fourth valve spool bosses (2-3, 2-4) respectively. An oil pressure balancing flow channel (1-10) is also arranged in the valve body (1). Two ends of the oil pressure balancing flow channel (1-10) are located outside two ends of an oil return flow channel (1-9) respectively, and the two ends of the oil pressure balancing flow channel (1-10) are in communication with the valve body main hole (1-8). Two ends of the valve body main hole (1-8) in the valve body are provided with fifth and sixth valve body steps (1-15, 1-16) axially, the fifth and sixth valve body steps (1-15, 1-16) being located outside the two ends of the oil return flow channel (1-9) and inside the two ends of the oil pressure balancing flow channel (1-10) respectively. The third valve spool boss (2-3) and the fourth valve spool boss (2-4) at the two ends of the valve spool (2) are in slidable fit with the corresponding fifth valve body step (1-15) and sixth valve body step (1-16) respectively. The other side of the spring seat (6) can abut against the sixth valve body step (1-16) and/or the fourth valve spool boss (2-4). The electromagnetic directional control valve can stop a contaminant from entering the electromagnet assembly, improve the reliability in use, and extend the service life.

Description

Electromagnetic reversing valve

Technical field

The invention relates to an electromagnetic reversing valve, in particular to an electromagnetic reversing valve for an engineering vehicle.

Background technique

The engineering vehicle of the present invention includes a forklift, a tractor, a loader, and the like.

The electromagnetic reversing valve used in the existing engineering vehicle includes a valve body, a valve core and an electromagnet assembly. The valve core is disposed in the main hole of the valve body of the valve body, and one end of the valve body is fixedly connected with the end cover, and the other end is fixed. And the electromagnet assembly is in communication with the inner cavity of the electromagnet assembly, the valve body includes three oil passages and an oil return passage, and the three oil passages respectively correspond to the first oil port, the second oil port and the oil inlet port Connected, the oil return port is connected with the oil return passage, and the three oil passages and the oil return passage are connected with the main hole of the valve body, and the existing oil return passage not only serves as a return oil passage for the pressure oil circulation, but also serves as both The oil pressure balance flow path at both ends of the valve core, because the pressure oil returns to the oil through the oil return passage, it is easy to cause the pollutant contained in the pressure oil to enter the inner cavity of the electromagnet assembly, and the pollutant is under the action of the armature suction. Will gradually consume the electromagnetic force of the electromagnet assembly, the contaminants accumulated over a long period of time will easily block the inner cavity of the electromagnet assembly, causing the electromagnet assembly to fail; once the electromagnetic reversing valve fails, the engineering vehicle is in the process of running, Can not properly control shifting, making work Car hard climbing, downhill coasting, if block traffic on high ground, but also easy to brake the car, can lead to major safety accidents. The electromagnetic reversing valve in the prior art also has shortcomings such as short service life, weak anti-pollution capability and poor reliability.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electromagnetic reversing valve capable of blocking contaminants from entering an electromagnet assembly, improving reliability of use, and having a long service life, thereby overcoming the deficiencies of the prior art.

In order to achieve the above object, the technical solution of the present invention is: an electromagnetic reversing valve, comprising a valve body, a valve core, a valve body end cover and an electromagnet assembly;

The valve body includes a first oil port, a second oil port, a oil return port, an oil inlet port, and a valve body main hole provided along an axial direction thereof, and a first axially spaced apart inner wall along the inner wall of the valve body main hole The oil passage, the second oil passage and the third oil passage, the first oil port is in communication with the first oil passage, the second oil port is in communication with the third oil passage, and the oil inlet port is in communication with the second oil passage. The first oil passage, the second oil passage and the third oil passage are all connected to the main hole of the valve body;

The valve body is provided with an oil return flow passage, and the oil return port is connected with the oil return flow passage, and two ends of the oil return flow passage are respectively located outside the first oil passage and the third oil passage, and the oil return flow passage Both ends are connected to the main hole of the valve body;

One end of the valve body is fixedly connected with the electromagnet assembly, and the valve body end cover is sealingly connected with the other end of the valve body;

The main body of the valve body is located between the two ends of the oil return flow passage, and the first step of the valve body and the second valve body are arranged separately in the axial direction. a step, a third step of the valve body and a fourth step of the valve body;

The valve core is disposed in a main body of the valve body of the valve body, the central portion of the valve core has a first boss of the valve core and a second boss of the valve core which are arranged separately in the axial direction, and the first boss and the valve core of the valve core An oil passage surface is disposed on the second boss;

The electromagnet assembly includes a first iron core, a second iron core, an armature, a push-pull rod, a coil, a return spring, a yoke, a magnetic isolation sleeve and a magnetic conductive ring, and one end of the armature is attached to one end of the push-pull rod or Forming one body, two ends of the magnetic shielding sleeve are respectively attached or welded on the first iron core and the second iron core, and the magnetic shielding sleeve is located on the outer circumference of the armature, and the coil is disposed on the outer circumference of the magnetic shielding sleeve, and a magnetically conductive ring is disposed between the two coils, and the yoke is disposed on the outer circumference of the two coils;

The first iron core is provided with an axial stepped hole, and the stepped hole is provided with a gasket, the push-pull rod has a limiting protrusion, the limiting protrusion is opposite to one side of the gasket, and the push-pull rod is further One end passes through the gasket and is fixedly connected to one end of the valve core, and one end of the valve core is provided with a spring seat, and the outer circumference of the other end of the push-pull rod is provided with a return spring, and one end of the return spring is opposite to one side of the spring seat. The other end of the return spring is opposite to the other side of the gasket;

a, the two ends of the valve core also have a valve core 笫 three bosses and a fourth boss of the valve core;

b. The valve body is further provided with a hydraulic pressure balance flow channel, two ends of the oil pressure balance flow channel are respectively located outside the oil return flow passages, and both ends of the oil pressure balance flow channel are connected with the main body of the valve body The two ends of the main body of the valve body of the valve body are respectively provided with a fifth step of the valve body and a sixth step of the valve body along the axial direction, and the fifth step of the valve body and the sixth step of the valve body are respectively located outside the two ends of the oil return flow path And the inner side of the oil pressure balance flow path;

c. The valve core 笫 three bosses at the two ends of the valve core and the fourth boss of the valve core respectively slidably cooperate with the corresponding fifth step of the valve body and the sixth step of the valve body;

d. The other side of the spring seat can abut the sixth step of the valve body and/or the fourth boss of the valve body.

In the above technical solution, the first boss of the valve core, the second boss of the valve core, the three bosses of the valve core, and the outer wall of the fourth boss of the valve core are provided with pressure equalizing grooves, wherein the valve core is first The boss and the second boss of the valve core are provided with two or more oil passage surfaces, the oil passage surface is a plane or a concave arc surface, and an oil passage is formed between the oil passage surface and the inner wall of the main hole of the valve body. mouth.

In the above technical solution, one end of the armature is screwed and fixed to one end of the push-pull rod, and the push-pull rod has an annular limiting protrusion, and one end of the valve core has an integral connecting sleeve, and the other end of the push-pull rod It passes through the gasket and is inserted into the connecting sleeve at one end of the valve core, and is fixedly connected to the connecting sleeve through the connecting member.

In the above technical solution, the second iron core is provided with a mounting hole and is provided with a pushing handle, and a sealing ring is disposed between the outer circumference of the shank of the pushing handle and the mounting hole.

In the above technical solution, the electromagnet assembly further includes an insulating protective layer covering the outer circumference of the first core and the yoke, one end of the insulating protective layer and the first iron core and the valve body, and the insulation A dust seal is disposed between the other end of the protective layer and the second core and the yoke.

In the above technical solution, the two ends of the magnetic shielding sleeve are respectively set on the core tube of the first iron core and the core tube of the second iron core, the core tube of the first iron core and the core of the second iron core A sealing ring is arranged between the tube and the magnetic shielding sleeve.

In the above technical solution, the first iron core is a circular iron core, and the second iron core is a square iron core.

In the above technical solution, the first oil port, the second oil port, the oil return port and the oil port of the oil inlet are provided with a sealing ring.

In the above technical solution, the electromagnet assembly is fixedly connected to one end of the valve body by a fastener.

In the above technical solution, the first iron core of the electromagnet assembly is screwed to one end of the valve body.

The positive effect of the invention is that: since the valve body is further provided with a hydraulic pressure balance flow passage, the two ends of the oil pressure balance flow passage are respectively located outside the oil return flow passages, and the oil pressure balance flow Both ends of the track are connected with the main hole of the valve body, and the two ends of the main hole of the valve body in the valve body are respectively provided with a fifth step of the valve body and a sixth step of the valve body in the axial direction, a fifth step of the valve body and a valve body The sixth step is respectively located at the outer side of the oil return flow path and the inner side of the oil pressure balance flow path, and the other side of the spring seat is opposite to the sixth valve body step of the valve body near the armature, so that the valve body of the present invention is provided A single oil pressure balance flow path that balances the oil pressure at both ends of the valve core, physically separates the oil return flow path and the oil pressure balance flow path, so that the pressure oil passes back during the oil return process. The oil flow path circulates to prevent contaminants from entering the interior of the electromagnet assembly, so that the contaminants do not block the interior of the electromagnet assembly, and the electromagnetic force of the electromagnet assembly is not consumed, which not only improves the use of the present invention. Reliability and long service life The two ends of the valve core further have a valve core 笫 three bosses and a fourth core boss of the valve core, and the valve core 笫 three bosses of the two ends of the valve core and the fourth boss of the valve core respectively Slidingly engaging with the corresponding fifth step of the valve body and the sixth step of the valve body, so that not only the gap between the bosses at the two end portions of the valve core and the corresponding valve body step is formed, but a gap is generated between the gaps. The oil film can function as a seal. The invention can block pollutants from entering the electromagnet assembly, improve the reliability of use, and has a long service life.

DRAWINGS

1 is a schematic structural view of a specific embodiment of the present invention;

Figure 2 is a cross-sectional view taken along line A-A of Figure 1;

Figure 3 is a cross-sectional view taken along line B-B of the fourth valve body step of Figure 1;

Figure 4 is a right side view of Figure 1;

Figure 5 is a schematic view of the second state of Figure 1;

Figure 6 is a schematic view of the third state of Figure 1;

Figure 7 is a perspective view of the valve core of Figure 1;

Figure 8 is a cross-sectional view taken along line C-C of the first valve body step of Figure 1;

Figure 9 is a bottom view of the valve body of Figure 1 taken along the E direction;

Figure 10 is a cross-sectional view of the valve body of Figure 1 taken along the line F-F;

Figure 11 is a cross-sectional view of the valve body of Figure 1 taken along the line G-G;

Figure 12 is a schematic view showing the structure of another embodiment of the present invention.

detailed description

The present invention will be further described below in conjunction with the drawings and the given embodiments, but is not limited thereto.

As shown in Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, an electromagnetic reversing valve includes a valve body 1, a valve core 2, a valve body end cover 3, and Electromagnet assembly 4;

The valve body 1 includes a first oil port 1-4, a second oil port 1-5, a oil return port 1-6, an oil inlet port 1-7, and a valve body main hole 1-8 provided along an axial direction thereof. And a first oil passage 1-1, a second oil passage 1-2, and a third oil passage 1-3 axially spaced apart along an inner wall of the valve body main hole 1-8, the first oil port 1-4 In communication with the first oil passage 1-1, the second oil port 1-5 is in communication with the third oil passage 1-3, and the oil inlet port 1-7 is in communication with the second oil passage 1-2, the first The oil passage 1-1, the second oil passage 1-2, and the third oil passage 1-3 are all connected to the main body hole 1-8 of the valve body;

The valve body 1 is provided with an oil return flow passage 1-9, the oil return port 1-6 is connected with the oil return flow passage 1-9, and the two ends of the oil return flow passage 1-9 are respectively located at the first oil The outer sides of the lanes 1-1 and the third oil passages 1-3, and the two ends of the oil return flow passages 1-9 are in communication with the valve body main holes 1-8;

One end of the valve body 1 is fixedly connected to the electromagnet assembly 4, and the valve body end cover 3 is sealingly connected to the other end of the valve body 1;

The valve body main hole 1-8 is located between the two ends of the oil return flow path 1-9, and the valve body first step 1-111 and the valve body second step 1-12 are arranged separately in the axial direction. The third step 1-13 of the valve body and the fourth step 1-14 of the valve body;

The valve body 2 is disposed in the valve body main hole 1-8 of the valve body 1, and the central portion of the valve body 2 has a spool first boss 2-1 and a second spool 2 in the axial direction. 2, and the valve body first boss 2-1 and the second core boss 2-2 of the valve core are provided with oil passage faces 2-6; the electromagnet assembly 4 includes a first core 4-1, a second Iron core 4-2, armature 4-3, push-pull rod 4-3-2, coil 4-4, return spring 4-5, yoke 4-6, magnetic shield 7 and magnetically permeable ring 8, said armature 4 One end of the -3 is attached or integrated with one end of the push-pull rod 4-3-2, and the two ends of the magnetic shield sleeve 7 are respectively attached or welded to the first core 4-1 and the second core 4- 2, and the magnetic shield 7 is located on the outer circumference of the armature 4-3, the coil 4-4 is disposed on the outer circumference of the magnetic shield 7, and a magnetic conductive ring 8 is disposed between the two coils 4-4, the magnetic The yoke 4-6 is disposed on the outer circumference of the two coils 4-4;

The first core 4-1 is provided with an axial stepped hole 4-1-1, and the stepped hole 4-1-1 is provided with a spacer 5, and the push-pull rod 4-3-2 has a limit. The protrusion 4-3-1, the limiting protrusion 4-3-1 is abutted on one side of the spacer 5, and the other end of the push-pull rod 4-3-2 passes through the spacer 5 and is fixedly connected with one end of the valve body 2. One end of the valve body 2 is provided with a spring seat 6, and the outer circumference of the other end of the push-pull rod 4-3-2 is provided with a return spring 4-5, and one end of the return spring 4-5 is offset from one side of the spring seat 6. The other end of the return spring 4-5 is opposite to the other side of the spacer 5;

a, the two ends of the valve core 2 also have a spool 笫 three bosses 2-3 and a fourth fourth boss 2-4;

b. The valve body 1 is further provided with a hydraulic pressure equalizing flow channel 1-10, and the two ends of the oil pressure balancing flow channel 1-10 are respectively located outside the two ends of the oil return flow channel 1-9, and the oil pressure is balanced. The two ends of the flow passage 1-10 are in communication with the main body hole 1-8 of the valve body, and the two ends of the main body hole 1-8 of the valve body 1 are respectively provided with the fifth step 1-15 of the valve body and the valve in the axial direction. The sixth step 1-16 of the body, the fifth step 1-15 of the valve body and the sixth step 1-16 of the valve body are respectively located at the outer side of the oil return flow path 1-9 and the inner side of the oil pressure balance flow path 1-10;

c. The valve core 笫 three bosses 2-3 at both ends of the valve body 2 and the fourth boss 2-4 of the valve core slide with the corresponding valve body fifth step 1-15 and the valve body sixth step 1-16, respectively. Cooperate

d. The other side of the spring seat 6 can be opposed to the valve body sixth step 1-16 and/or the valve body fourth boss 2-4.

As shown in Figures 1, 5, 6, 7, and 8, the oil passage surface is for facilitating the flow of pressure oil in one flow passage to the other flow passage, the first boss 2-1 and the second spool. The outer wall of the boss 2-2, the valve core 笫3 boss 2-3 and the fourth boss 2-4 of the valve core are provided with pressure equalizing grooves 2-7, wherein the valve body first boss 2-1 and the valve The second core boss 2-2 is provided with two or more oil passing surfaces 2-6, the oil passing surface 2-6 is a flat or concave curved surface, and the oil passing surface 2-6 and the valve body main An oil passage 1-8-1 is formed between the inner walls of the holes 1-8.

As shown in Figures 1, 5 and 6, in order to make the structure of the present invention reasonably compact and easy to assemble, one end of the armature 4-3 is screwed and fixed to one end of the push-pull rod 4-3-2, and the push-pull rod 4-3- 2 has an annular limiting protrusion 4-3-1, one end of the valve core 2 has an integral connecting sleeve 2-5, and the other end of the push-pull rod 4-3-2 passes through the spacer 5 and is inserted One end of the valve body 2 is connected to the sleeve 2-2, and is fixedly connected to the connecting sleeve 2-5 through a connecting member. The connecting member may be a pin or a pin or a snap spring or the like.

As shown in Figures 1, 4, 5, 6, 9, and 12, once the dirt in the oil causes the armature or the spool to become stuck, the handle can be pushed to push the armature and indirectly push the spool to move for emergency treatment. The second core 4-2 is provided with a mounting hole and is provided with a pushing handle 9. A sealing ring is disposed between the outer circumference of the shank of the pushing handle 9 and the mounting hole.

As shown in FIGS. 1, 5, 6, and 12, in order to improve the sealing property of the electromagnet assembly, and prevent particulate matter such as dust and corrosive gas liquid from entering the inside of the electromagnet assembly, the electromagnet assembly 4 further includes insulation. The protective layer 4-7, the insulating protective layer 4-7 is wrapped around the outer circumference of the first core 4-1 and the yoke 4-6, and one end of the insulating protective layer 4-7 is connected to the first core 4-1 and the valve body A dust seal 10 is provided between the other end of the insulating core 4-7 and the second core 4-2 and the yoke 4-6.

As shown in FIG. 1, 5, 6, and 12, in order to make the sealing property between the iron core and the magnetic shielding sleeve good, the two ends of the magnetic shielding sleeve 7 are respectively set in the core tube 4 of the first iron core 4-1. -1-2 and the core tube 4-2-1 of the second core 4-2, the core tube 4-1-2 of the first core 4-1 and the core tube of the second core 4-2 A seal ring is provided between the 4-2-1 and the magnetic isolation sleeve 7. Of course, it is also possible that the two ends of the magnetic shield 7 are respectively welded to the core tube 4-1-2 of the first core 4-1 and the core tube 4-2-1 of the second core 4-2, and are separated. The magnetic sleeve 7 is located on the outer circumference of the armature 4-3.

As shown in FIG. 4, in order to make the structure of the present invention reasonably compact and easy to install, the first core 4-1 is a circular core, and the second core 4-2 is a square core.

As shown in Figures 1, 2, 5 and 6, in order to facilitate the sealing connection with the oil cylinder and the fuel tank, and the sealing property of the mounting surface of the electromagnetic valve, the first oil port 1-4, the second oil port 1-5, and the oil return Sealing rings are provided at ports 1-6 and inlets 1-7.

As shown in Figures 1, 4, 5, 6, and 9, in order to facilitate assembly of the present invention, the electromagnet assembly 4 is fixedly coupled to one end of the valve body 1 by fasteners 11.

As shown in FIG. 12, the first core 4-1 of the electromagnet assembly 4 is screwed to one end of the valve body 1 for ease of assembly.

The valve body main hole 1-8 of the present invention is an axial through hole for fitting a valve cover, a valve body and a spring seat.

The valve body 1 of the present invention is provided with a U-shaped oil return flow passage 1-9, and the oil return port 1-6 is connected with the middle portion of the oil return flow passage 1-9, and two of the oil return flow passages 1-9 The ends are respectively located outside the first oil passage 1-1 and the second oil passage 1-2; and the valve body 1 is further provided with a U-shaped oil pressure balance flow passage 1-10. The oil return flow passages 1-9 and the oil pressure balance flow passages 1-10 may not be U-shaped mold flow passages, but may be formed into other machined orifice flow passages by using a process hole plus plug.

The working process of the invention: in use, the oil inlet 1-7 is connected with the oil outlet of the oil pump, and the first oil port 1-4 and the second oil port 1-5 are respectively connected to the corresponding working oil ports of the oil cylinder, The oil return port 1-6 is connected to the oil inlet of the oil tank;

As shown in FIG. 1, when both sets of coils 4-4 are not energized, the spool 2 is in the middle of the valve body 1 under the action of the return spring 4-5. At this time, the pressure oil cannot pass through. The oil port 1-7 enters the first port 1-4, the second port 1-5 and the oil return port 1-6, and at this time, the first port 1-4, the second port 1-5 and the return oil Ports 1-6 are all connected;

As shown in FIG. 5, when one set of coils 4-4 near the first core 4-1 is energized, the other set of coils is not electrically charged, and the annular projection of the armature 4-3 4-3-1 pushes the pad. The sheet 5 is moved forward, so that the return spring 4-5 is in a compressed state, and the push-pull rod 4-3-2 pushes the spool 2 forward, and the pressure oil is sequentially from the oil inlet 1-7, the first port 1- 4. One oil port of the oil cylinder, the other oil port of the oil cylinder, and the second oil port 1-5, and finally return to the oil tank through the oil return port 1-6;

As shown in FIG. 6, when one set of coils 4-4 near the second core 4-2 is energized, the other set of coils is not energized, and the push-pull rod 4-3-2 of the armature 4-3 pulls the spool 2 moving backwards, so that the return spring 4-5 is in a stretched state, and the pressure oil is sequentially from the oil inlet 1-7, the second port 1-5, one port of the cylinder, the other port of the cylinder, the first The oil port 1-4 is finally returned to the fuel tank through the oil return port 1-6.

Since the valve body 1 of the present invention is provided with a single oil pressure balance flow path 1-10 capable of balancing the oil pressure at both ends of the valve body 2, the oil return flow path 1-3 and the oil pressure balance flow path 1 - 10 is physically separated, rather than a return oil flow path of the electromagnetic reversing valve in the prior art, taking into account both the oil return and balancing the oil pressure at both ends of the valve core, so that the pressure oil is returning oil During the process, the pressure oil circulates through the oil return passage to prevent the pollutant from entering the inside of the electromagnet assembly 4, so that the contaminant does not block the interior of the electromagnet assembly 4, and the electromagnetic of the electromagnet assembly is not consumed. The force not only improves the reliability of use of the present invention, but also makes the service life long.

Claims

An electromagnetic reversing valve comprises a valve body (1), a valve core (2), a valve body end cover (3) and an electromagnet assembly (4);

The valve body (1) includes a first oil port (1-4), a second oil port (1-5), a oil return port (1-6), an oil inlet port (1-7), and an axial direction thereof The main body hole (1-8) and the first oil passage (1-1) and the second oil passage (1-2) which are axially arranged along the inner wall of the main body hole (1-8) of the valve body are provided. And a third oil passage (1-3), the first oil port (1-4) is in communication with the first oil passage (1-1), and the second oil port (1-5) is connected to the third oil passage (1-5) 1-3) connected, the oil inlet (1-7) is in communication with the second oil passage (1-2), the first oil passage (1-1), the second oil passage (1-2), and The third oil passages (1-3) are all connected to the main body hole (1-8) of the valve body;

The valve body (1) is provided with an oil return flow passage (1-9), and the oil return port (1-6) is connected with the oil return flow passage (1-9), and the oil return flow passage (1-1) The two ends of 9) are respectively located outside the first oil passage (1-1) and the third oil passage (1-3), and both ends of the oil return passage (1-9) and the main hole of the valve body (1- 8) connected;

One end of the valve body (1) is fixedly connected with the electromagnet assembly (4), and the valve body end cover (3) is sealingly connected with the other end of the valve body (1);

The main body hole (1-8) of the valve body is located between the two ends of the oil return flow passage (1-9), and the first step (1-11) of the valve body which is arranged separately in the axial direction, the valve body Two steps (1-12), third step of the valve body (1-13) and fourth step of the valve body (1-14);

The valve core (2) is disposed in the valve body main hole (1-8) of the valve body (1), and the central portion of the valve core (2) has a valve body first boss arranged in the axial direction (2-1) ) and the second boss (2-2) of the spool, and the first boss (2-1) of the spool and the second boss (2-2) of the spool have an oil passage surface (2-6) ;

The electromagnet assembly (4) includes a first core (4-1), a second core (4-2), an armature (4-3), a push-pull rod (4-3-2), and a coil (4-) 4), a return spring (4-5), a yoke (4-6), a magnetic shield (7) and a magnetically permeable ring (8), one end of the armature (4-3) and a push-pull rod (4-3) One end of the -2) is attached or integrated, and both ends of the magnetic shielding sleeve (7) are respectively attached or welded to the first iron core (4-1) and the second iron core (4-2). And the magnetic shield (7) is located on the outer circumference of the armature (4-3), the coil (4-4) is disposed on the outer circumference of the magnetic shield (7), and a guide is arranged between the two coils (4-4) a magnetic ring (8), the yoke (4-6) being disposed on an outer circumference of the two coils (4-4);

The first iron core (4-1) is provided with an axial stepped hole (4-1-1), and the stepped hole (4-1-1) is provided with a gasket (5), and the push-pull rod ( 4-3-2) has a limit protrusion (4-3-1), the limit protrusion (4-3-1) is on the side of the spacer (5), and the push-pull rod (4-3-2) The other end of the valve (5) is fixedly connected to one end of the valve core (2), and one end of the valve core (2) is provided with a spring seat (6), and the push-pull rod (4-3-2) The outer circumference of the other end is provided with a return spring (4-5), and one end of the return spring (4-5) abuts against one side of the spring seat (6), and the other end of the return spring (4-5) and the spacer The other side of (5) is offset; it is characterized by:

a, the valve core (2) also has a valve core 笫 three bosses (2-3) and a valve core fourth boss (2-4);

b. The valve body (1) is further provided with a hydraulic pressure balance flow channel (1-10), and the two ends of the oil pressure balance flow channel (1-10) are respectively Located at the outer ends of the oil return passage (1-9), and the two ends of the oil pressure balance flow passage (1-10) are connected to the main body hole (1-8), and the valve body (1) is the main body of the valve body. The two ends of the hole (1-8) are also respectively provided with a fifth step (1-15) of the valve body and a sixth step (1-16) of the valve body, a fifth step (1-15) of the valve body and a valve. The sixth step (1-16) of the body is located at the outer side of both ends of the oil return flow path (1-9) and the inner side of both ends of the oil pressure balance flow path (1-10);

c. The valve core 笫 three bosses (2-3) at both ends of the valve core (2) and the fourth boss (2-4) of the valve core respectively and the corresponding valve body fifth step (1-15) and valve The sixth step (1-16) of the body is slidingly fitted;

d. The other side of the spring seat (6) can abut against the sixth step (1-16) of the valve body and/or the fourth boss (2-4) of the valve plug.
The electromagnetic directional control valve according to claim 1, characterized in that: the valve body first boss (2-1), the valve core second boss (2-2), and the valve core 笫 three bosses (2) -3) and the outer wall of the fourth boss (2-4) of the spool is provided with a pressure equalizing groove (2-7), wherein the first boss (2-1) of the spool and the second boss of the spool ( 2-2) Two or more oil passages (2-6) are provided on the upper side, and the oil passage surface (2-6) is a flat or concave curved surface, and the oil passage surface (2-6) and the valve An oil passage (1-8-1) is formed between the inner walls of the body main holes (1-8).
The electromagnetic directional control valve according to claim 1, characterized in that one end of the armature (4-3) is screwed and fixed to one end of the push-pull rod (4-3-2), and the push-pull rod (4-3-2) ) having an annular limiting protrusion (4-3-1), one end of the valve core (2) has an integral connecting sleeve (2-5), and the push-pull rod (4-3-2) is another One end passes through the gasket (5) and is inserted into the connecting sleeve (2-2) at one end of the valve core (2), and is fixedly connected to the connecting sleeve (2-5) through the connecting member.
The electromagnetic reversing valve according to claim 1, characterized in that: the second core (4-2) is provided with a mounting hole and is provided with a push handle (9), and the handle of the push handle (9) A seal ring is provided between the outer circumference of the rod and the mounting hole.
The electromagnetic directional control valve according to claim 1, wherein said electromagnet assembly (4) further comprises an insulating protective layer (4-7), and said insulating protective layer (4-7) is coated on said first iron core (4-1) and the outer circumference of the yoke (4-6), one end of the insulating protective layer (4-7) and the first core (4-1) and the valve body (1) and the insulating protective layer (4) A dust seal (10) is provided between the other end of -7) and the second core (4-2) and the yoke (4-6).
The electromagnetic directional control valve according to claim 1, wherein both ends of the magnetic shield (7) are respectively fitted to the core tube (4-1-2) of the first core (4-1) and On the core tube (4-2-1) of the second core (4-2), the core tube (4-1-2) and the second core (4-) of the first core (4-1) 2) A sealing ring is provided between the core tube (4-2-1) and the magnetic shielding sleeve (7).
The magnetic directional control valve according to claim 1, wherein said first core (4-1) is a circular core and said second core (4-2) is a square core.
The electromagnetic directional control valve according to claim 1, characterized in that: the first oil port (1-4), the second oil port (1-5), the oil return port (1-6), and the oil inlet port Sealing rings are provided at the ports of (1-7).
The electromagnetic reversing valve according to claim 1, wherein said electromagnet assembly (4) passes through a fastener (11) Fixedly connected to one end of the valve body (1).
The electromagnetic directional control valve according to claim 1, characterized in that the first core (4-1) of the electromagnet assembly (4) is screwed to one end of the valve body (1).