Working valve and multi-way valve

Abstract

The present application relates to a working valve block and a multi-way valve. The working valve plate provided by the present application includes a valve body and a differential one-way valve. The valve body is provided with a main oil inlet channel and an auxiliary oil inlet channel. The differential one-way valve is provided in the main oil inlet channel to control the on-off of the main oil inlet channel, and the differential one-way valve separates the main oil inlet channel into a first channel and a second channel. The flow direction of the pressure oil is from the first channel to the second channel. The first channel is connected to the second channel through the auxiliary oil inlet channel, and the cross-sectional area of ​​the auxiliary oil inlet channel is smaller than that of the main oil inlet channel. The working valve block and multi-way valve provided by the present application solve the problem that the existing forklift body is easily affected by the excessive impact of the forklift body on the bottom of the body due to the excessively fast descending speed of the forklift body, and does not affect the operating efficiency of the forklift.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a working valve plate and a multi-way valve. Background Art

[0002] As an industrial handling vehicle, forklifts are indispensable to the development of modern industry. Industrial handling vehicles are widely used in ports, stations, airports, freight yards, factory workshops, warehouses, circulation centers and distribution centers. In addition, forklifts can enter the cabins, carriages and containers to load and unload pallet cargo and carry out handling operations. They are essential equipment in pallet transportation and container transportation.

[0003] Usually, a forklift has a working valve plate, which includes a valve body and a differential one-way valve. The valve body is provided with a main oil inlet channel, and the differential one-way valve is provided in the main oil inlet channel to control the on-off of the main oil inlet channel. When the forklift body is descending, the pressurized oil pushes the differential one-way valve to open the main oil inlet channel for oil return. The cross-sectional area of ​​the main oil inlet channel is large, and the pressure oil returns at a faster speed, which leads to a faster descent speed of the forklift body. Especially when the forklift body is about to descend to the bottom, the forklift body descends too fast, which can easily cause the forklift body to have too much impact on the bottom of the body, which can easily cause damage to the forklift or even injury to the forklift driver.

[0004] In order to solve the problem that the forklift body is easily hit too hard on the bottom of the body by the forklift body when it descends too fast, which may even damage the forklift or injure the forklift driver. Generally, the cross-sectional area of ​​the main oil inlet channel is reduced to reduce the oil return speed of the pressure oil, thereby reducing the descending speed of the forklift body. However, the above solution will cause the overall descending speed of the forklift body to be too slow, affecting the operating efficiency of the forklift. Summary of the invention

[0005] Based on this, it is necessary to provide a working valve plate and a multi-way valve to solve the problem that the existing forklift body descends too fast, which easily causes excessive impact on the bottom of the body, without affecting the operating efficiency of the forklift.

[0006] The working valve plate provided in the present application includes a valve body and a differential one-way valve. The valve body is provided with a main oil inlet channel and an auxiliary oil inlet channel. The differential one-way valve is arranged in the main oil inlet channel to control the on-off of the main oil inlet channel, and the differential one-way valve divides the main oil inlet channel into a first channel and a second channel. The flow direction of the pressurized oil is from the first channel to the second channel. The first channel is connected to the second channel through the auxiliary oil inlet channel, and the cross-sectional area of ​​the auxiliary oil inlet channel is smaller than the cross-sectional area of ​​the main oil inlet channel.

[0007] In one embodiment, the cross-sectional area S of the auxiliary oil inlet passage and the cross-sectional area Q of the main oil inlet passage satisfy Q ≥ 5 S. It can be understood that such a configuration is conducive to significantly reducing the descending speed of the forklift body when it approaches the bottom of the body.

[0008] In one embodiment, the auxiliary oil inlet channel includes a first assembly channel and a second assembly channel arranged vertically, and the first channel is connected to the second channel through the first assembly channel and the second assembly channel in sequence. It can be understood that such an arrangement facilitates the connection between the first channel and the second channel.

[0009] In one embodiment, the end of the first assembly channel away from the first channel passes through the surface of the valve body, and a first plug is provided at the opening of the first assembly channel on the surface of the valve body; and / or the end of the second assembly channel away from the second channel passes through the surface of the valve body, and a second plug is provided at the opening of the second assembly channel on the surface of the valve body. It can be understood that such a configuration is conducive to the processing of the first assembly channel and the second assembly channel.

[0010] In one embodiment, a throttle valve is provided in the auxiliary oil inlet passage, and the throttle valve is provided with a throttle hole, and the cross-sectional area of ​​the throttle hole is smaller than the cross-sectional area of ​​the auxiliary oil inlet passage. It can be understood that such a configuration is conducive to further reducing the descending speed of the forklift body without significantly increasing the manufacturing cost of the working valve plate.

[0011] In one embodiment, the cross-sectional area S of the auxiliary oil inlet passage and the cross-sectional area P of the throttle hole satisfy S≥4P. It can be understood that such a configuration is conducive to significantly reducing the descending speed of the forklift body when it approaches the bottom of the body.

[0012] In one embodiment, the valve body is further provided with a pressure relief channel, the differential one-way valve is provided with a hydraulic chamber, the working valve plate further includes a solenoid valve, the hydraulic chamber is connected to the pressure relief channel through the solenoid valve, and the solenoid valve is used to control the on-off between the hydraulic chamber and the pressure relief channel; the differential one-way valve is provided with a boosting channel, the hydraulic chamber is connected to the first channel through the boosting channel, and the cross-sectional area of ​​the boosting channel is smaller than the cross-sectional area of ​​the pressure relief channel. It can be understood that such a setting is conducive to improving the intelligence of the working valve plate.

[0013] In one embodiment, the valve body is further provided with a reflux channel, and the pressure relief channel is connected to the second channel through the reflux channel. It can be understood that such a configuration is conducive to the reflux of the pressure oil.

[0014] In one embodiment, the end of the reflux channel away from the second channel penetrates the surface of the valve body, and a ball expansion plug is provided at the opening of the reflux channel on the surface of the valve body. It can be understood that such a configuration is conducive to the reflux of the pressure oil.

[0015] The present application also provides a multi-way valve, which includes the working valve plate described in any one of the above embodiments.

[0016] Compared with the prior art, the working valve plate and multi-way valve provided by the present application, when the forklift body begins to descend, when the differential one-way valve opens the main oil inlet channel, the pressure oil can be returned from the main oil inlet channel and the auxiliary oil inlet channel at the same time, thus greatly improving the descent speed of the forklift body, thereby improving the operating efficiency of the forklift. When the forklift body descends to a position close to the bottom, the differential one-way valve is closed, at which time the pressure oil can only be returned from the auxiliary oil inlet channel. In addition, because the cross-sectional area of ​​the auxiliary oil inlet channel is smaller than the cross-sectional area of ​​the main oil inlet channel, the descent speed of the forklift body is greatly reduced, thus avoiding excessive impact on the bottom of the forklift body caused by the forklift body descending too quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A cross-sectional view of the working valve plate provided for this application;

[0019] Figure 2 Pipeline diagram of the working valve plate provided for this application.

[0020] Figure numerals: 100, valve body; 110, main oil inlet channel; 111, first channel; 112, second channel; 120, auxiliary oil inlet channel; 121, first assembly channel; 1211, first plug; 122, second assembly channel; 1221, second plug; 130, pressure relief channel; 140, reflux channel; 141, ball expansion plug; 200, differential one-way valve; 210, hydraulic chamber; 220, boost channel; 300, throttle valve; 310, throttle hole; 400, solenoid valve; 500, check valve. DETAILED DESCRIPTION

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] As an industrial handling vehicle, forklifts are indispensable to the development of modern industry. Industrial handling vehicles are widely used in ports, stations, airports, freight yards, factory workshops, warehouses, circulation centers and distribution centers. In addition, forklifts can enter the cabins, carriages and containers to load and unload pallet cargo and carry out handling operations. They are essential equipment in pallet transportation and container transportation.

[0028] Usually, a forklift has a working valve plate, which includes a valve body and a differential one-way valve. The valve body is provided with a main oil inlet channel, and the differential one-way valve is provided in the main oil inlet channel to control the on-off of the main oil inlet channel. When the forklift body is descending, the pressurized oil pushes the differential one-way valve to open the main oil inlet channel for oil return. The cross-sectional area of ​​the main oil inlet channel is large, and the pressure oil returns at a faster speed, which leads to a faster descent speed of the forklift body. Especially when the forklift body is about to descend to the bottom, the forklift body descends too fast, which can easily cause the forklift body to have too much impact on the bottom of the body, which can easily cause damage to the forklift or even injury to the forklift driver.

[0029] In order to solve the problem that the forklift body is easily hit too hard on the bottom of the body by the forklift body when it descends too fast, which may even damage the forklift or injure the forklift driver. Generally, the cross-sectional area of ​​the main oil inlet channel is reduced to reduce the oil return speed of the pressure oil, thereby reducing the descending speed of the forklift body. However, the above solution will cause the overall descending speed of the forklift body to be too slow, affecting the operating efficiency of the forklift.

[0030] See also Figure 1 and Figure 2In order to balance the descending speed of the forklift body and the operating efficiency of the forklift, the working valve plate provided in the present application includes a valve body 100 and a differential one-way valve 200. The valve body 100 is provided with a main oil inlet channel 110 and an auxiliary oil inlet channel 120. The differential one-way valve 200 is arranged in the main oil inlet channel 110 to control the on-off of the main oil inlet channel 110, and the differential one-way valve 200 divides the main oil inlet channel 110 into a first channel 111 and a second channel 112. The flow direction of the pressure oil is from the first channel 111 to the second channel 112. The first channel 111 is connected to the second channel 112 through the auxiliary oil inlet channel 120, and the cross-sectional area of ​​the auxiliary oil inlet channel 120 is smaller than the cross-sectional area of ​​the main oil inlet channel 110. In this way, when the forklift body begins to descend, when the differential one-way valve 200 opens the main oil inlet channel 110, the pressure oil can be returned from the main oil inlet channel 110 and the auxiliary oil inlet channel 120 at the same time, thus greatly improving the descent speed of the forklift body, thereby improving the operating efficiency of the forklift. When the forklift body descends to a position close to the bottom, the differential one-way valve 200 is closed. At this time, the pressure oil can only be returned from the auxiliary oil inlet channel 120. In addition, because the cross-sectional area of ​​the auxiliary oil inlet channel 120 is smaller than the cross-sectional area of ​​the main oil inlet channel 110, the descent speed of the forklift body is greatly reduced, avoiding the excessive impact on the bottom of the forklift body caused by the forklift body descending too fast. In summary, the working valve plate and multi-way valve provided by the present application effectively solve the problem that the existing forklift body descends too fast, which easily causes the forklift body to cause excessive impact on the bottom of the body, and does not affect the operating efficiency of the forklift.

[0031] Furthermore, in order to significantly reduce the descending speed of the forklift body when it approaches the bottom of the body, in one embodiment, the cross-sectional area S of the auxiliary oil inlet channel 120 and the cross-sectional area Q of the main oil inlet channel 110 satisfy Q ≥ 5S. However, it is not limited thereto, and the cross-sectional area of ​​the main oil inlet channel 110 may also be 4 times, 3 times, or 2 times the cross-sectional area of ​​the auxiliary oil inlet channel 120, which are not listed here one by one.

[0032] Generally, the first channel 111 and the second channel 112 are vertically arranged. Therefore, in order to facilitate the connection between the first channel 111 and the second channel 112, in one embodiment, as Figure 1 As shown, the auxiliary oil inlet channel 120 includes a first assembly channel 121 and a second assembly channel 122 which are vertically arranged, and the first channel 111 is connected to the second channel 112 through the first assembly channel 121 and the second assembly channel 122 in sequence.

[0033] Further, in order to facilitate the processing of the first assembly channel 121, in one embodiment, as Figure 1As shown, one end of the first assembly channel 121 away from the first channel 111 passes through the surface of the valve body 100. Furthermore, in order to prevent the pressure oil from leaking from the first assembly channel 121, a first plug 1211 is provided at the opening of the first assembly channel 121 located on the surface of the valve body 100, and the first plug 1211 is detachably connected to the opening of the first assembly channel 121 located on the surface of the valve body 100.

[0034] Similarly, in order to facilitate the processing of the second assembly channel 122, in one embodiment, as Figure 1 As shown, one end of the second assembly channel 122 away from the second channel 112 passes through the surface of the valve body 100. Furthermore, in order to prevent the pressure oil from leaking from the first assembly channel 121, a second plug 1221 is provided at the opening of the second assembly channel 122 located on the surface of the valve body 100, and the second plug 1221 is detachably connected to the opening of the second assembly channel 122 located on the surface of the valve body 100.

[0035] Generally, in order to further reduce the descending speed of the forklift body, it is necessary to process the auxiliary oil inlet channel 120 with a smaller cross-sectional area. However, the smaller the cross-sectional area of ​​the auxiliary oil inlet channel 120, the greater the difficulty of processing, and even significantly increases the manufacturing cost of the working valve plate. Therefore, in order to further reduce the descending speed of the forklift body without significantly increasing the manufacturing cost of the working valve plate, in one embodiment, as Figure 1 As shown, a throttle valve 300 is provided in the auxiliary oil inlet channel 120, and a throttle hole 310 is provided in the throttle valve 300, and the cross-sectional area of ​​the throttle hole 310 is smaller than the cross-sectional area of ​​the auxiliary oil inlet channel 120. Since the flow rate of the pressurized oil in the auxiliary oil inlet channel 120 depends on the minimum cross-sectional area, the minimum cross-sectional area of ​​the auxiliary oil inlet channel 120 is further reduced by providing the throttle valve 300 with the throttle hole 310 in the auxiliary oil inlet channel 120, thereby further reducing the descending speed of the forklift body.

[0036] Further, in order to facilitate the installation of the throttle valve 300, in one embodiment, as Figure 1 As shown, the inner wall of one end of the second assembly channel 122 close to the second channel 112 is tapered, and the outer wall shape of the throttle valve 300 is adapted to the inner wall of one end of the second assembly channel 122 close to the second channel 112, and the throttle valve 300 is installed in the second assembly channel 122 from the opening of the second assembly channel 122. In order to prevent the throttle valve 300 from loosening due to the impact of the pressurized oil, the cone angle of the throttle valve 300 faces the second channel 112.

[0037] Furthermore, in order to more significantly reduce the descent speed of the forklift body when it approaches the bottom of the body, in one embodiment, the cross-sectional area S of the auxiliary oil inlet channel 120 and the cross-sectional area P of the throttle hole 310 satisfy S≥4P. However, it is not limited to this. The cross-sectional area of ​​the auxiliary oil inlet channel 120 can also be 4 times, 3 times or 2 times the cross-sectional area of ​​the throttle hole 310, which are not listed here. When S≥4P, and Q≥5S, then Q≥20P, that is, the minimum cross-sectional area of ​​the auxiliary oil inlet channel 120 is less than or equal to one twentieth of the cross-sectional area of ​​the main oil inlet channel 110. With this arrangement, the limit on the return oil volume of the pressure oil is significantly improved, which greatly reduces the descent speed of the forklift body.

[0038] In order to improve the intelligence of the working valve plate, in one embodiment, as Figure 1 and Figure 2 As shown, the valve body 100 is also provided with a pressure relief channel 130, the differential one-way valve 200 is provided with a hydraulic chamber 210, and the working valve plate also includes a solenoid valve 400, the hydraulic chamber 210 is connected to the pressure relief channel 130 through the solenoid valve 400, and the solenoid valve 400 is used to control the on-off between the hydraulic chamber 210 and the pressure relief channel 130. The differential one-way valve 200 is provided with a boost channel 220, and the hydraulic chamber 210 is connected to the first channel 111 through the boost channel 220. In this way, when the solenoid valve 400 receives a cut-off instruction, the solenoid valve 400 cuts off the hydraulic chamber 210 and the pressure relief channel 130. At this time, the pressure oil in the hydraulic chamber 210 cannot flow out through the pressure relief channel 130, and the hydraulic pressure value in the hydraulic chamber 210 cannot be reduced, while the pressure oil continuously flows into the hydraulic chamber 210 from the boost channel 220, resulting in an increase in the hydraulic pressure in the hydraulic chamber 210 until the differential one-way valve 200 cuts off the first channel 111 and the second channel 112. When the solenoid valve 400 receives the connection instruction, the solenoid valve 400 connects the hydraulic chamber 210 and the pressure relief channel 130. At this time, the pressure oil in the hydraulic chamber 210 flows out through the pressure relief channel 130, and the hydraulic pressure value in the hydraulic chamber 210 continues to decrease. Although the pressure oil continuously flows into the hydraulic chamber 210 from the boost channel 220, since the cross-sectional area of ​​the boost channel 220 is smaller than the cross-sectional area of ​​the pressure relief channel 130, the pressure oil generally keeps flowing out of the hydraulic chamber 210, and the hydraulic pressure of the hydraulic chamber 210 generally decreases until the differential check valve 200 opens the first channel 111 and the second channel 112.

[0039] In order to facilitate the return of the pressure oil, in one embodiment, as Figure 1 As shown, the valve body 100 is further provided with a return channel 140 , and the pressure relief channel 130 is connected to the second channel 112 through the return channel 140 .

[0040] Further, in order to facilitate the processing of the return channel 140, in one embodiment, as Figure 1As shown, one end of the reflux channel 140 away from the second channel 112 penetrates the surface of the valve body 100. A ball expansion plug 141 is provided at the opening of the reflux channel 140 located on the surface of the valve body 100. Furthermore, in order to prevent the pressurized oil in the reflux channel 140 from flowing back to the pressure relief channel 130, a check valve 500 is usually provided in the pressure relief channel 130.

[0041] The present application also provides a multi-way valve, which includes the working valve plate described in any one of the above embodiments.

[0042] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A working valve plate, characterized in that: The invention comprises a valve body (100) and a differential check valve (200), wherein the valve body (100) is provided with a main oil inlet channel (110) and an auxiliary oil inlet channel (120), wherein the differential check valve (200) is provided in the main oil inlet channel (110) to control the on-off of the main oil inlet channel (110), and the differential check valve (200) divides the main oil inlet channel (110) into a first channel (111) and a second channel (112), wherein the flow direction of the pressure oil is from the first channel (111) to the second channel (112), wherein the first channel (111) is connected to the second channel (112) through the auxiliary oil inlet channel (120), and the cross-sectional area of ​​the auxiliary oil inlet channel (120) is smaller than the cross-sectional area of ​​the main oil inlet channel (110); The valve body (100) is also provided with a pressure relief channel (130), the differential one-way valve (200) is provided with a hydraulic chamber (210), and the working valve plate further includes a solenoid valve (400), the hydraulic chamber (210) is connected to the pressure relief channel (130) through the solenoid valve (400), and the solenoid valve (400) is used to control the on-off between the hydraulic chamber (210) and the pressure relief channel (130); the differential one-way valve (200) is provided with a pressure boosting channel (220), the hydraulic chamber (210) is connected to the first channel (111) through the pressure boosting channel (220), and the cross-sectional area of ​​the pressure boosting channel (220) is smaller than the cross-sectional area of ​​the pressure relief channel (130).

2. The working valve sheet according to claim 1, characterized in that: The cross-sectional area S of the auxiliary oil inlet passage (120) and the cross-sectional area Q of the main oil inlet passage (110) satisfy Q≥5S.

3. The working valve sheet according to claim 1, characterized in that: The auxiliary oil inlet channel (120) comprises a first assembly channel (121) and a second assembly channel (122) which are vertically arranged, and the first channel (111) is connected to the second channel (112) through the first assembly channel (121) and the second assembly channel (122) in sequence.

4. The working valve sheet according to claim 3, characterized in that: An end of the first assembly channel (121) away from the first channel (111) passes through the surface of the valve body (100), and a first plug (1211) is provided at the opening of the first assembly channel (121) located on the surface of the valve body (100); and / or an end of the second assembly channel (122) away from the second channel (112) passes through the surface of the valve body (100), and a second plug (1221) is provided at the opening of the second assembly channel (122) located on the surface of the valve body (100).

5. The working valve sheet according to claim 3, characterized in that: A throttle valve (300) is provided in the auxiliary oil inlet passage (120), and the throttle valve (300) is provided with a throttle hole (310), and the cross-sectional area of ​​the throttle hole (310) is smaller than the cross-sectional area of ​​the auxiliary oil inlet passage (120).

6. The working valve sheet according to claim 5, characterized in that: The cross-sectional area S of the auxiliary oil inlet passage (120) and the cross-sectional area P of the throttle hole (310) satisfy S≥4P.

7. The working valve sheet according to claim 1, characterized in that: The valve body (100) is further provided with a reflux channel (140), and the pressure relief channel (130) is connected to the second channel (112) through the reflux channel (140).

8. The working valve plate according to claim 7, characterized in that: One end of the reflux channel (140) away from the second channel (112) penetrates the surface of the valve body (100), and a ball expansion plug (141) is provided at the opening of the reflux channel (140) located on the surface of the valve body (100).

9. A multi-way valve, characterized in that: Comprising a working valve plate as described in any one of claims 1-8.

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