CN114294286A - Working valve plate and multi-way valve - Google Patents
Working valve plate and multi-way valve Download PDFInfo
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- CN114294286A CN114294286A CN202111608709.6A CN202111608709A CN114294286A CN 114294286 A CN114294286 A CN 114294286A CN 202111608709 A CN202111608709 A CN 202111608709A CN 114294286 A CN114294286 A CN 114294286A
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- 239000007788 liquid Substances 0.000 claims description 41
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 176
- 230000002349 favourable effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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Abstract
The application relates to a work valve block and multiple unit valve, work valve block include valve body, valve rod, locking structure and push rod structure, and the locking structure is used for controlling the break-make of first branch oil passageway, and the valve body is equipped with push rod activity chamber, and push rod structure movably locates push rod activity intracavity, and when pressure fluid stopped to get into the second branch oil passageway, first branch oil passageway can be closed to the locking structure to prevent pressure fluid to flow back to main oil return passageway through first branch oil passageway. The application provides a work valve block and multiple unit valve, when there is not pressure fluid in the second branch oil passageway, the first branch oil passageway of locking structure opening can't be promoted to the push rod structure, and pressure fluid can not flow back to main oil return passage through first branch oil passageway, and then makes the hydraulic pressure that the fork goods shelves received remain stable, avoids the fork goods shelves to lean forward.
Description
Technical Field
The application relates to the technical field of hydraulic elements of engineering machinery, in particular to a working valve plate and a multi-way valve.
Background
A forklift is indispensable to the development of modern industry as an industrial transportation vehicle. Industrial transportation vehicles are widely used in ports, stations, airports, cargo yards, factory workshops, warehouses, distribution centers and the like, and fork trucks can enter cabins, carriages and containers to load, unload and transport pallet goods, and are indispensable equipment for pallet transportation and container transportation.
In general, a forklift uses a multi-way valve as a power element for controlling forward or backward tilting of a fork rack in front of the forklift. Also, a multiple-way valve typically includes an oil inlet valve plate, an oil return valve plate, and a plurality of service valve plates. Generally, the working valve plate comprises a valve body and a valve rod, the valve body is provided with a valve cavity, a main oil inlet channel, a main oil return channel, a first oil distribution channel and a second oil distribution channel, the main oil inlet channel is communicated with the first oil distribution channel and the second oil distribution channel through the valve cavity, and the main oil return channel is communicated with the first oil distribution channel and the second oil distribution channel through the valve cavity. The valve rod is movably arranged in the valve cavity, the valve rod can control the main oil inlet channel to be communicated with the first oil distribution channel or the second oil distribution channel, and the valve rod can control the main oil return channel to be communicated with the first oil distribution channel or the second oil distribution channel.
Specifically, when the valve rod communicates with the main oil inlet channel and the second oil distribution channel, the first oil distribution channel communicates with the main oil return channel, so that an oil circuit circulation is formed, and a fork rack of the forklift tilts forward to be beneficial to the forklift to fork heavy objects. Similarly, when the valve rod is communicated with the main oil inlet channel and the first oil distribution channel, the second oil distribution channel is communicated with the main oil return channel, so that an oil circuit circulation is formed, and a fork goods shelf of the forklift is inclined backwards, so that the heavy objects can be kept stable on the fork goods shelf. Under fork goods shelves of fork truck inserted the state that the weight kept the heeling, when fork truck broke down and flameout suddenly, main oil feed passageway will not continue to divide oil passage to the second and continue input pressure fluid, and at this moment, the hydraulic pressure that fork goods shelves received can descend suddenly and lead to fork goods shelves to take place to lean forward, and then leads to the heavy object landing on the fork goods shelves and lead to the loss.
Disclosure of Invention
Therefore, a need exists for a working valve plate and a multi-way valve, which solve the problem that a forklift suddenly stalls to cause a forklift rack to tilt forward.
The application provides a work valve piece includes valve body, valve rod, locking structure and push rod structure, the valve body is equipped with valve pocket, main oil feed passageway, main oil return passageway, first minute oil passageway and second minute oil passageway, main oil feed passageway passes through the valve pocket intercommunication first minute oil passageway with the second minute oil passageway, main oil return passageway passes through the valve pocket intercommunication first minute oil passageway with the second minute oil passageway. Valve rod movably locates in the valve cavity, the valve rod can control main oil feed passageway intercommunication first minute oil passageway or intercommunication the second divides oil passageway, just the valve rod can control main oil return passageway intercommunication first minute oil passageway or intercommunication the second divides oil passageway. The locking structure is used for controlling the on-off of the first oil distribution channel, the valve body is provided with a push rod movable cavity, the push rod structure is movably arranged in the push rod movable cavity, when pressure oil enters the second oil distribution channel through the main oil inlet channel, the push rod structure can move towards the locking structure to push the locking structure to open the first oil distribution channel, and the pressure oil can flow back to the main oil return channel through the first oil distribution channel; when pressure fluid stops getting into during the second oil distribution channel, the locking structure can close first oil distribution channel to prevent pressure fluid through first oil distribution channel backward flow extremely main oil return passage.
In one embodiment, the valve body is provided with a hydraulic cavity, the push rod structure is provided with a liquid inlet channel which is communicated with the second oil distribution channel and the hydraulic cavity, and pressure oil can enter the hydraulic cavity from the second oil distribution channel through the liquid inlet channel so as to enable the push rod structure to move towards the direction close to the locking structure; the push rod structure is further provided with a liquid outlet channel communicated with the second oil distribution channel and the hydraulic cavity, and pressure oil can enter the second oil distribution channel from the hydraulic cavity through the liquid outlet channel, so that the push rod structure moves towards the direction far away from the locking structure. It can be understood that, by the arrangement, the control efficiency of the pressure oil on the push rod structure is improved.
In one embodiment, a third check valve is provided in the liquid inlet passage, and opens when the pressure oil flows from the liquid inlet passage to the hydraulic chamber, and closes when the pressure oil flows from the hydraulic chamber to the liquid inlet passage. It can be understood that, so set up, be favorable to pressure fluid to get into the hydraulic pressure intracavity from the second oil distributing passage, and prevent that the pressure fluid in the hydraulic pressure intracavity from passing through the inlet channel backward flow.
In one embodiment, the third check valve includes a third compression spring and a third movable plug connected to one end of the third compression spring, and the third compression spring has a tendency to push the third movable plug to move toward the locking structure, so that the third movable plug blocks the liquid inlet channel. It can be understood that, the arrangement is favorable for simplifying the structure of the third check valve and reducing the manufacturing cost of the working valve plate.
In one embodiment, the third movable plug is a steel ball. It can be understood that the arrangement is favorable for improving the sealing performance of the third movable plug.
In one embodiment, the largest cross-sectional area M of the liquid outlet channel is smaller than the smallest cross-sectional area N of the liquid inlet channel. It can be understood that, so set up, be favorable to making to form the damping between locking structure and the push rod structure and vibrate the effect, and then avoid first oil distribution channel to close completely and lead to fork goods shelves card pause phenomenon to appear, improved fork truck's operation travelling comfort.
In one embodiment, M ≦ N/10.
In one embodiment, a liquid outlet gap is arranged between the push rod structure and the inner wall of the push rod movable cavity, and the liquid outlet gap forms the liquid outlet channel. It can be understood that, the arrangement is favorable for reducing the processing difficulty of the liquid outlet channel.
In one embodiment, the valve body is provided with a processing opening of the push rod movable cavity, and a high-pressure plug is fixedly arranged at the processing opening of the push rod movable cavity to seal the push rod movable cavity. It can be understood that, the arrangement is favorable for reducing the assembly difficulty of the push rod structure.
The application also provides a multi-way valve, which comprises the working valve plate in any one of the embodiments.
Compared with the prior art, the application provides a work valve block and multiple unit valve, when there is pressure fluid in the second oil distribution channel, the push rod structure can promote locking structure and open first oil distribution channel to make work valve block form complete circulating oil circuit. When there is not pressure fluid in the second oil distribution channel, the push rod structure can't promote the locking structure and open first oil distribution channel, and pressure fluid can not flow back to main oil return passage through first oil distribution channel, and then makes the hydraulic pressure that the fork goods shelves received remain stable, avoids the fork goods shelves to lean forward.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a service valve plate provided herein;
FIG. 2 is an enlarged view taken at A of FIG. 1;
FIG. 3 is a piping diagram of the working valve plate provided by the present application.
Reference numerals: 100. a valve body; 110. a valve cavity; 120. a main oil inlet channel; 130. a main oil return passage; 131. a first oil return passage; 132. a second oil return passage; 140. a first oil distribution passage; 150. a second oil distribution channel; 160. a push rod movable cavity; 170. a hydraulic chamber; 180. processing an opening; 200. a valve stem; 300. a locking structure; 400. a push rod structure; 410. a liquid inlet channel; 420. a liquid outlet channel; 430. a liquid outlet gap; 500. a third check valve; 510. a third compression spring; 520. a third movable plug; 600. and (4) a high-pressure plug.
Detailed Description
In the description of the present application, it is to be understood that the terms "center," "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 present application and for simplicity in 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 present application.
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 at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, 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 intervening media. 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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
A forklift is indispensable to the development of modern industry as an industrial transportation vehicle. Industrial transportation vehicles are widely used in ports, stations, airports, cargo yards, factory workshops, warehouses, distribution centers and the like, and fork trucks can enter cabins, carriages and containers to load, unload and transport pallet goods, and are indispensable equipment for pallet transportation and container transportation.
In general, a forklift uses a multi-way valve as a power element for controlling forward or backward tilting of a fork rack in front of the forklift. Also, a multiple-way valve typically includes an oil inlet valve plate, an oil return valve plate, and a plurality of service valve plates. Generally, the working valve plate comprises a valve body 100 and a valve rod 200, the valve body 100 is provided with a valve cavity 110, a main oil inlet passage 120, a main oil return passage 130, a first oil distribution passage 140 and a second oil distribution passage 150, the main oil inlet passage 120 is communicated with the first oil distribution passage 140 and the second oil distribution passage 150 through the valve cavity 110, and the main oil return passage 130 is communicated with the first oil distribution passage 140 and the second oil distribution passage 150 through the valve cavity 110. The valve rod 200 is movably disposed in the valve cavity 110, the valve rod 200 can control the main oil inlet passage 120 to communicate with the first oil distribution passage 140 or communicate with the second oil distribution passage 150, and the valve rod 200 can control the main oil return passage 130 to communicate with the first oil distribution passage 140 or communicate with the second oil distribution passage 150.
Specifically, when the valve rod 200 communicates with the main oil inlet passage 120 and the second oil distribution passage 150, the first oil distribution passage 140 communicates with the main oil return passage 130, so as to form an oil circuit circulation, and the fork frame of the forklift is tilted forward, so as to facilitate the forklift to fork a heavy object. Similarly, when the valve rod 200 communicates with the main oil inlet passage 120 and the first oil distribution passage 140, the second oil distribution passage 150 communicates with the main oil return passage 130, so as to form an oil circuit circulation, and the fork frame of the forklift truck is tilted backwards, so as to help the heavy objects to be kept stable on the fork frame. Under the state that the fork goods shelf of fork truck inserted the weight and kept the heeling, when fork truck broke down and suddenly flame-out, main oil feed passageway 120 will not continue to the second branch oil passageway 150 input pressure fluid, and at this moment, the hydraulic pressure that the fork goods shelf received can descend suddenly and lead to the fork goods shelf to take place to lean forward, and then leads to the heavy object landing on the fork goods shelf and lead to the loss. It should be noted that, in the present embodiment, the main oil return passage 130 includes a first oil return passage 131 and a second oil return passage 132, and normally, the first oil return passage 131 is communicated when the first oil distribution passage 140 returns oil, and the second oil return passage 132 is communicated when the second oil distribution passage 150 returns oil. Without limitation, the main oil return passage 130 may also include other numbers of oil return passages, not listed herein.
Referring to fig. 1-3, in order to solve the problem that the fork rack tilts forward due to sudden flameout of the forklift, the working valve plate provided by the present application further includes a locking structure 300 and a push rod structure 400. The lock structure 300 is used to control the opening and closing of the first branch oil passage 140, and generally, the lock structure 300 is a check valve structure. Specifically, the valve body 100 is provided with the plunger movable cavity 160, the plunger structure 400 is movably disposed in the plunger movable cavity 160, when the pressure oil enters the second oil distribution channel 150 through the main oil inlet channel 120, the plunger structure 400 can move towards the locking structure 300 to push the locking structure 300 to open the first oil distribution channel 140, and the pressure oil can flow back to the main oil return channel 130 through the first oil distribution channel 140, so that a complete oil circuit circulation is formed. When the pressure oil stops entering the second branch oil passage 150, the locking structure 300 can close the first branch oil passage 140 to prevent the pressure oil from flowing back to the main oil return passage 130 through the first branch oil passage 140. Thus, when the second oil dividing passage 150 has pressure oil therein, the push rod structure 400 can push the locking structure 300 to open the first oil dividing passage 140, so that the service valve plate forms a complete circulation oil path. When no pressure oil exists in the second oil distribution channel 150, the push rod structure 400 cannot push the locking structure 300 to open the first oil distribution channel 140, and the pressure oil cannot flow back to the main oil return channel 130 through the first oil distribution channel 140, so that the hydraulic pressure of the fork shelf is kept stable, and the fork shelf is prevented from inclining forwards.
In order to improve the control efficiency of the push rod structure 400 by the pressure oil, in one embodiment, as shown in fig. 1 and 2, the valve body 100 is provided with a hydraulic cavity 170, the push rod structure 400 is provided with an inlet passage 410 communicating the second oil dividing passage 150 with the hydraulic cavity 170, and the pressure oil can enter the hydraulic cavity 170 from the second oil dividing passage 150 through the inlet passage 410, so that the push rod structure 400 moves towards the direction close to the locking structure 300. The push rod structure 400 is further provided with a liquid outlet channel 420 communicating the second oil distribution channel 150 and the hydraulic cavity 170, and pressure oil can enter the second oil distribution channel 150 from the hydraulic cavity 170 through the liquid outlet channel 420, so that the push rod structure 400 moves away from the locking structure 300. Thus, when pressure oil passes through the second oil dividing passage 150, the pressure oil directly enters the hydraulic cavity 170 through the liquid inlet passage 410 from the second oil dividing passage 150, and then the push rod structure 400 is pushed to open the locking structure 300. When the locking structure 300 closes the first oil distribution channel 140 and pushes the push rod structure 400 to reset, the pressure oil in the hydraulic chamber 170 can enter the second oil distribution channel 150 through the liquid outlet channel 420, so that the push rod structure 400 can be reset smoothly. In conclusion, the arrangement greatly improves the control efficiency of the pressure oil on the push rod structure 400.
Further, in order to facilitate the entry of the pressure oil into the hydraulic chamber 170 from the second oil distribution passage 150 and to prevent the pressure oil in the hydraulic chamber 170 from flowing back through the liquid inlet passage 410, in one embodiment, as shown in fig. 1 and 2, a third check valve 500 is disposed in the liquid inlet passage 410, and when the pressure oil flows from the liquid inlet passage 410 to the hydraulic chamber 170, the third check valve 500 is opened, and when the pressure oil flows from the hydraulic chamber 170 to the liquid inlet passage 410, the third check valve 500 is closed.
Specifically, in order to simplify the structure of the third check valve 500 and reduce the manufacturing cost of the working valve plate, in one embodiment, as shown in fig. 1 and 2, the third check valve 500 includes a third compression spring 510 and a third movable plug 520 connected to one end of the third compression spring 510, and the third compression spring 510 has a tendency to push the third movable plug 520 to move toward the locking structure 300, so that the third movable plug 520 blocks the liquid inlet channel 410. But not limited thereto, the third check valve 500 may also be a rotary valve that is opened in one direction.
Further, in order to improve the sealing performance of the third movable plug 520, in one embodiment, as shown in fig. 1 and 2, the third movable plug 520 is a steel ball. The steel ball is simple to manufacture and has better sealing effect, and the control precision of the working valve plate is improved.
When the fork goods shelves lean forward and the in-process of fork the heavy object, under the effect of heavy object, fork truck receives the tractive power of heavy object and has the trend that leans forward, at this moment, pressure fluid that gets into in second branch oil passageway 150 can diminish, thereby the pressure fluid that leads to second branch oil passageway 150 to get into hydraulic pressure chamber 170 diminishes, and then the thrust that leads to push rod structure 400 can diminish, so, locking structure 300 can have the trend of reclosing first branch oil passageway 140, at this moment, locking structure 300 can promote push rod structure 400 and reset, at this in-process, pressure fluid in hydraulic pressure chamber 170 can leave hydraulic pressure chamber 170 through liquid outlet channel 420. If the pressure oil leaves the hydraulic chamber 170 too fast, the reset speed of the push rod structure 400 is too fast, and the speed of the first oil distribution channel 140 closed by the locking structure 300 is too fast, so that the fork rack is blocked. In order to avoid the fork rack from getting stuck, in one embodiment, the maximum sectional area M of the liquid outlet channel 420 is smaller than the minimum sectional area N of the liquid inlet channel 410. So set up, the speed of resetting of putter structure 400 is slower, before locking structure 300 closes first minute oil passageway 140 completely, along with the increase of the pressure fluid of entering in the second minute oil passageway 150, pressure fluid in hydraulic pressure chamber 170 can drive putter structure 400 fast and promote locking structure 300 and enlarge the circulation of pressure fluid in first minute oil passageway 140 again, so, can make and form damping oscillation effect between locking structure 300 and the putter structure 400, and then avoid first minute oil passageway 140 to close completely and lead to fork goods shelves card pause phenomenon to appear, fork truck's operation travelling comfort has been improved. It should be noted that the reset of the push rod structure 400 refers to the push rod structure 400 moving away from the locking structure 300.
Further, in one embodiment, M ≦ N/10.
In order to reduce the difficulty of processing the liquid outlet channel 420, in one embodiment, as shown in fig. 1 and fig. 2, a liquid outlet gap 430 is provided between the push rod structure 400 and the inner wall of the push rod movable cavity 160, and the liquid outlet gap 430 forms the liquid outlet channel 420.
To facilitate assembling the tappet structure 400, in one embodiment, as shown in fig. 1 and 2, the valve body 100 is provided with a processing opening 180 of the tappet moving cavity 160, and a high-pressure plug 600 is fixedly arranged at the processing opening 180 of the tappet moving cavity 160 to seal the tappet moving cavity 160.
The application also provides a multi-way valve, which comprises the working valve plate in any one of the embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. The working valve plate is characterized by comprising a valve body (100), a valve rod (200), a locking structure (300) and a push rod structure (400), wherein the valve body (100) is provided with a valve cavity (110), a main oil inlet channel (120), a main oil return channel (130), a first oil distribution channel (140) and a second oil distribution channel (150), the main oil inlet channel (120) is communicated with the first oil distribution channel (140) and the second oil distribution channel (150) through the valve cavity (110), and the main oil return channel (130) is communicated with the first oil distribution channel (140) and the second oil distribution channel (150) through the valve cavity (110);
the valve rod (200) is movably arranged in the valve cavity (110), the valve rod (200) can control the main oil inlet channel (120) to be communicated with the first oil distribution channel (140) or the second oil distribution channel (150), and the valve rod (200) can control the main oil return channel (130) to be communicated with the first oil distribution channel (140) or the second oil distribution channel (150);
the locking structure (300) is used for controlling the on-off of the first oil distribution channel (140), the valve body (100) is provided with a push rod movable cavity (160), the push rod structure (400) is movably arranged in the push rod movable cavity (160), when pressure oil enters the second oil distribution channel (150) through the main oil inlet channel (120), the push rod structure (400) can move towards the locking structure (300) to push the locking structure (300) to open the first oil distribution channel (140), and the pressure oil can flow back to the main oil return channel (130) through the first oil distribution channel (140); when the pressure oil stops entering the second oil dividing passage (150), the locking structure (300) can close the first oil dividing passage (140) to prevent the pressure oil from flowing back to the main oil return passage (130) through the first oil dividing passage (140).
2. The service valve plate according to claim 1, wherein the valve body (100) is provided with a hydraulic cavity (170), the pushrod structure (400) is provided with an inlet channel (410) communicating the second oil dividing channel (150) and the hydraulic cavity (170), and pressure oil can enter the hydraulic cavity (170) from the second oil dividing channel (150) through the inlet channel (410) so as to move the pushrod structure (400) towards the direction close to the locking structure (300); the push rod structure (400) is further provided with a liquid outlet channel (420) communicated with the second oil distribution channel (150) and the hydraulic cavity (170), and pressure oil can enter the second oil distribution channel (150) from the hydraulic cavity (170) through the liquid outlet channel (420), so that the push rod structure (400) moves towards the direction far away from the locking structure (300).
3. The service valve plate according to claim 2, wherein a third check valve (500) is arranged in the liquid inlet channel (410), when pressure oil flows from the liquid inlet channel (410) to the hydraulic cavity (170), the third check valve (500) is opened, and when pressure oil flows from the hydraulic cavity (170) to the liquid inlet channel (410), the third check valve (500) is closed.
4. The service valve plate according to claim 3, wherein the third check valve (500) comprises a third compression spring (510) and a third movable plug (520) connected to one end of the third compression spring (510), and the third compression spring (510) has a tendency to push the third movable plug (520) to move towards the locking structure (300), so that the third movable plug (520) blocks the inlet channel (410).
5. The service valve sheet according to claim 4, wherein the third movable plug (520) is a steel ball.
6. The service valve plate according to claim 3, wherein the maximum cross-sectional area M of the outlet channel (420) is smaller than the minimum cross-sectional area N of the inlet channel (410).
7. The service valve sheet according to claim 6, wherein M is equal to or less than N/10.
8. The service valve plate according to claim 2, wherein a liquid outlet gap (430) is provided between the tappet structure (400) and the inner wall of the tappet movable cavity (160), and the liquid outlet gap (430) forms the liquid outlet channel (420).
9. The service valve plate according to claim 1, wherein the valve body (100) is provided with a processing opening (180) of the pushrod active cavity (160), and a high pressure plug (600) is fixedly arranged at the processing opening (180) of the pushrod active cavity (160) to seal the pushrod active cavity (160).
10. Multiple unit valve, comprising a service valve plate according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111608709.6A CN114294286B (en) | 2021-12-26 | 2021-12-26 | Working valve plate and multi-way valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111608709.6A CN114294286B (en) | 2021-12-26 | 2021-12-26 | Working valve plate and multi-way valve |
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| CN114294286A true CN114294286A (en) | 2022-04-08 |
| CN114294286B CN114294286B (en) | 2024-04-09 |
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| CN108825828A (en) * | 2018-08-08 | 2018-11-16 | 北京特种机械研究所 | A kind of electric control one-way valve |
| CN109372814A (en) * | 2018-12-15 | 2019-02-22 | 浙江海宏液压科技股份有限公司 | A kind of interflow raising load sensing multi-way valve |
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2021
- 2021-12-26 CN CN202111608709.6A patent/CN114294286B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0625602U (en) * | 1993-08-05 | 1994-04-08 | 東芝機械株式会社 | Directional control valve |
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| Publication number | Publication date |
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| CN114294286B (en) | 2024-04-09 |
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