Working valve block and fork truck

Abstract

This application relates to a working valve block and a forklift. The working valve block includes a valve body, which has an oil inlet channel, a working channel, and an energy storage channel. The oil inlet channel is connected to the forklift's hydraulic pump, the working channel is connected to the forklift's actuating mechanism, and the energy storage channel is connected to the forklift's energy storage device. When the working channel is connected to the oil inlet channel, pressurized hydraulic fluid can enter the working channel from the oil inlet channel. When the working channel is connected to the energy storage channel, pressurized hydraulic fluid can enter the energy storage channel from the working channel, thereby storing the kinetic energy of the pressurized hydraulic fluid in the forklift's energy storage device. The working valve block and forklift provided by this application solve the problem of excessive energy loss during the descent of existing forklift masts.

Description

Technical Field

[0001] This application relates to the field of hydraulic components for engineering machinery, and in particular to a working valve block and a forklift. Background Technology

[0002] Forklifts, as industrial handling vehicles, are indispensable to the development of modern industry. Industrial handling vehicles are widely used in ports, railway stations, airports, freight yards, factory workshops, warehouses, distribution centers, and other occasions. Furthermore, forklifts can enter ship holds, truck beds, and containers to load, unload, and handle palletized goods, making them essential equipment in pallet and container transportation.

[0003] The mast of a forklift needs to rise and fall as required during operation. A significant portion of the energy is lost when the mast is lowered, and a large amount of energy is also consumed when the mast rises again. Summary of the Invention

[0004] Therefore, it is necessary to provide a working valve block and forklift to solve the problem of excessive energy loss during the descent of existing forklift masts.

[0005] The working valve block provided in this application includes a valve body, which is provided with an oil inlet channel, a working channel and an energy storage channel. The oil inlet channel is used to connect to the hydraulic pump of the forklift, the working channel is used to connect to the actuating mechanism of the forklift, and the energy storage channel is used to connect to the energy storage device of the forklift. When the working channel is connected to the oil inlet channel, the pressurized oil can enter the working channel from the oil inlet channel. When the working channel is connected to the energy storage channel, the pressurized oil can enter the energy storage channel from the working channel, so as to store the kinetic energy of the pressurized oil in the energy storage device of the forklift.

[0006] In one embodiment, the valve body further includes a valve cavity, through which an oil inlet channel, a working channel, and an energy storage channel are respectively connected. The working valve block also includes a valve stem, which is movably disposed within the valve cavity. When the valve stem is in a first position, the oil inlet channel connects to the working channel via the valve cavity; when the valve stem is in a second position, the working channel connects to the energy storage channel via the valve cavity. It is understood that this arrangement is beneficial for improving the working efficiency of the working valve block.

[0007] In one embodiment, the valve body is further provided with a return oil passage, and the inlet oil passage can be connected to the return oil passage through the valve cavity, and the working passage can be connected to the return oil passage through the valve cavity. It is understood that this arrangement is beneficial for the recovery of pressurized oil.

[0008] In one embodiment, the oil inlet channel includes a first oil inlet channel and a second oil inlet channel, the working channel includes a first branch channel and a second branch channel, and the oil return channel includes a first oil return channel and a second oil return channel, with the second oil return channel connecting to the energy storage channel. When the valve stem is in the first position, the first oil inlet channel connects to the first branch channel through the valve cavity, and the second oil inlet channel connects to the second branch channel through the valve cavity. When the valve stem is in the second position, the second branch channel connects to the second oil return channel through the valve cavity. When the valve stem is in the third position, the first oil inlet channel connects to the first oil return channel through the valve cavity. It is understood that this configuration is beneficial for improving the oil inlet and return efficiency of the working valve block.

[0009] In one embodiment, the valve body is further provided with a variable channel that can connect the first return oil passage and the second return oil passage, and a partition is installed in the variable channel.

[0010] In one embodiment, the partition is detachably installed within the variable channel. It is understood that this arrangement facilitates the installation and removal of the partition.

[0011] In one embodiment, the partition is threaded to the inner wall of the variable channel, and one side of the partition has an internal hexagonal hole. It is understood that this arrangement significantly improves the efficiency of assembling and disassembling the partition.

[0012] In one embodiment, a one-way valve is provided in the first branch channel to allow pressurized oil to flow unidirectionally from the first inlet channel to the first branch channel. It is understood that this arrangement helps prevent pressurized oil from flowing back into the first branch channel.

[0013] In one embodiment, the valve body is further provided with an overflow channel that connects the first oil inlet channel and the first oil return channel. A pressure valve is installed within the overflow channel. When the hydraulic pressure in the first oil inlet channel exceeds a preset pressure value, pressurized oil can open the pressure valve and enter the first oil return channel. It is understood that this design helps prevent the hydraulic pressure in the first oil inlet channel from exceeding the preset pressure value, thus avoiding damage to the working valve block.

[0014] This application also provides a forklift, which includes a hydraulic pump, an actuating mechanism, an energy storage device, and a working valve block as described in any of the above embodiments. The oil inlet channel is connected to the hydraulic pump, the working channel is connected to the actuating mechanism, and the energy storage channel is connected to the energy storage device. When the working channel is connected to the oil inlet channel, pressurized oil can enter the working channel from the oil inlet channel. When the working channel is connected to the energy storage channel, pressurized oil can enter the energy storage channel from the working channel, so as to store the kinetic energy of the pressurized oil in the energy storage device.

[0015] Compared with existing technologies, the working valve block and forklift provided in this application, by setting up an energy storage channel connected to an energy storage device, enable the kinetic energy of the pressurized oil during the return process to be converted into compressive energy and stored in the energy storage device. When the forklift's operating mechanism needs to consume energy, the compressed energy stored in the energy storage device is released, thereby realizing the reuse of energy recovered by the energy storage device. In general, this setting greatly reduces energy loss when the forklift mast descends. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the working valve block provided in this application;

[0018] Figure 2 for Figure 1 The sectional view at point AA is shown.

[0019] Figure 3 for Figure 1 The sectional view at point BB is shown.

[0020] Figure 4 Piping diagram of the working valve block provided in this application.

[0021] Reference numerals: 100, valve body; 110, oil inlet channel; 111, first oil inlet channel; 112, second oil inlet channel; 120, working channel; 121, first branch channel; 122, second branch channel; 130, energy storage channel; 140, oil return channel; 141, first oil return channel; 142, second oil return channel; 150, valve chamber; 160, overflow channel; 170, variable channel; 200, valve stem; 300, partition; 310, internal hexagonal hole; 400, check valve; 500, pressure valve. Detailed Implementation

[0022] In the description of this application, it should 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", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Unless otherwise defined, 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 specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Forklifts, as industrial handling vehicles, are indispensable to the development of modern industry. Industrial handling vehicles are widely used in ports, railway stations, airports, freight yards, factory workshops, warehouses, distribution centers, and other occasions. Furthermore, forklifts can enter ship holds, truck beds, and containers to load, unload, and handle palletized goods, making them essential equipment in pallet and container transportation.

[0029] The mast of a forklift needs to rise and fall as required during operation. A significant portion of the energy is lost when the mast is lowered, and a large amount of energy is also consumed when the mast rises again.

[0030] Please see Figures 1-4To further reduce energy loss during forklift mast descent, this application provides a working valve block, which includes a valve body 100. The valve body 100 has an oil inlet channel 110, a working channel 120, and an energy storage channel 130. The oil inlet channel 110 is used to connect to the forklift's hydraulic pump (not shown). The working channel 120 is used to connect to the forklift's actuating mechanism (not shown), which includes, but is not limited to, the forklift's mast, braking system, and attachments, etc., and is not listed here. The energy storage channel 130 is used to connect to the forklift's energy storage device (not shown). When the working channel 120 is connected to the oil inlet channel 110, pressurized hydraulic fluid can enter the working channel 120 from the oil inlet channel 110. When the working channel 120 is connected to the energy storage channel 130, pressurized hydraulic fluid can enter the energy storage channel 130 from the working channel 120, so as to store the kinetic energy of the pressurized hydraulic fluid in the forklift's energy storage device. Specifically, when the working channel 120 is connected to the oil inlet channel 110, the hydraulic pump provides pressurized oil to the oil inlet channel 110. The pressurized oil enters the working channel 120 from the oil inlet channel 110. At this time, the forklift's operating mechanism consumes energy. When the working channel 120 is connected to the energy storage channel 130, the pressurized oil can enter the energy storage channel 130 from the working channel 120 to store the kinetic energy of the pressurized oil in the forklift's energy storage device. At this time, the forklift's operating mechanism outputs energy.

[0031] It should be noted that the working valve block provided in this application can be used not only on forklifts, but also on other vehicles, such as excavators, loaders, or transport vehicles. However, it is not limited to these. The working valve block provided in this application can also be used on agricultural vehicles, such as rice transplanters, etc. These are not listed here.

[0032] It should be further explained that after the pressurized oil enters the energy storage device, the pressurized oil drives the motor inside the energy storage device to generate electricity. That is, the kinetic energy of the pressurized oil is converted into electrical energy and stored in the energy storage device.

[0033] By setting up an energy storage channel 130 connected to the energy storage device, the kinetic energy of the pressurized oil during the return process can be converted into compressive energy and stored in the energy storage device. When the forklift's operating mechanism needs to consume energy, the compressed energy stored in the energy storage device is released, thereby realizing the reuse of energy recovered by the energy storage device. In general, this setup greatly reduces energy loss when the forklift mast descends.

[0034] To improve the working efficiency of the working valve block, in one embodiment, such as Figure 2 and Figure 3As shown, the valve body 100 also includes a valve cavity 150. An oil inlet channel 110, a working channel 120, and an energy storage channel 130 are respectively connected to the valve cavity 150. The working valve block also includes a valve stem 200, which is movably disposed within the valve cavity 150. When the valve stem 200 is in the first position, the oil inlet channel 110 connects to the working channel 120 through the valve cavity 150. When the valve stem 200 is in the second position, the working channel 120 connects to the energy storage channel 130 through the valve cavity 150. Specifically, when the valve stem 200 is in the first position, the oil inlet channel 110 connects to the working channel 120 through the valve cavity 150, allowing pressurized oil to enter the working channel 120 from the oil inlet channel 110. At this time, the forklift's operating mechanism consumes energy. When the valve stem 200 is in the second position, the working channel 120 is connected to the energy storage channel 130 through the valve chamber 150, and the pressurized oil can enter the energy storage channel 130 from the working channel 120 to store the kinetic energy of the pressurized oil in the energy storage device of the forklift. At this time, the forklift's action mechanism outputs energy.

[0035] Furthermore, to facilitate the recovery of pressurized oil, in one embodiment, such as Figure 2 and Figure 3 As shown, the valve body 100 is also provided with a return oil passage 140. The inlet oil passage 110 can be connected to the return oil passage 140 through the valve chamber 150, and the working passage 120 can be connected to the return oil passage 140 through the valve chamber 150. In this way, the pressurized oil can enter the return oil passage 140 from the working passage 120, thereby completing the return of the pressurized oil.

[0036] Furthermore, in order to improve the oil inlet and return efficiency of the working valve block, in one embodiment, such as Figure 2 and Figure 3As shown, the oil inlet channel 110 includes a first oil inlet channel 111 and a second oil inlet channel 112, the working channel 120 includes a first branch channel 121 and a second branch channel 122, and the oil return channel 140 includes a first oil return channel 141 and a second oil return channel 142. The second oil return channel 142 is connected to the energy storage channel 130. When the valve stem 200 is in the first position, the first oil inlet channel 111 is connected to the first branch channel 121 through the valve chamber 150, and the second oil inlet channel 112 is connected to the second branch channel 122 through the valve chamber 150. When the valve stem 200 is in the second position, the second branch channel 122 is connected to the second oil return channel 142 through the valve chamber 150. When the valve stem 200 is in the third position, the first oil inlet channel 111 is connected to the first oil return channel 141 through the valve chamber 150. Specifically, when the valve stem 200 is in the first position, the first oil inlet channel 111 is connected to the first branch channel 121 through the valve chamber 150, and the second oil inlet channel 112 is connected to the second branch channel 122 through the valve chamber 150. At this time, the first oil inlet channel 110 and the second oil inlet channel 110 simultaneously receive oil, which greatly improves the oil intake efficiency of the working valve block, increases the power of the forklift, and is beneficial for the forklift mast to rise. When the valve stem 200 is in the second position, the second branch channel 122 is connected to the second return oil channel 142 through the valve chamber 150. Since the second return oil channel 142 is connected to the energy storage channel 130, the pressurized oil in the second branch channel 122 enters the energy storage channel 130 from the second return oil channel 142, and the forklift mast descends. When the valve stem 200 is in the third position, the first oil inlet passage 111 connects to the first oil return passage 141 through the valve chamber 150. At this time, the pressurized oil in the first oil inlet passage 110 returns directly through the first oil return passage 141, and the forklift mast remains stationary. It should be noted that the first branch passage 121 and the second branch passage 122 share a common outlet at the end furthest from the valve chamber 150.

[0037] When the energy storage device malfunctions or the forklift is not equipped with an energy storage device, in order to change the flow path of the pressurized oil in the working valve block, in one embodiment, such as Figure 2As shown, the valve body 100 also includes a variable channel 170, which connects the first return oil passage 141 and the second return oil passage 142. A partition 300 is installed within the variable channel 170. Thus, when the partition 300 is installed within the variable channel 170, the variable channel 170 is isolated by the partition 300, effectively preventing the flow of pressurized oil between the first return oil passage 141 and the second return oil passage 142. When the partition 300 is not installed within the variable channel 170 and the energy storage passage 130 is blocked, the pressurized oil in the second return oil passage 140 can flow back to the first return oil passage 140, thereby allowing the pressurized oil to flow back in a concentrated manner. Furthermore, to facilitate the installation and removal of the partition 300, in one embodiment, the partition 300 is detachably installed within the variable channel 170. Furthermore, in one embodiment, the partition 300 is threaded to the inner wall of the variable channel 170, and one side of the partition 300 is provided with an internal hexagonal hole 310. Thus, the partition 300 can be disassembled and assembled using an internal hexagonal wrench, which greatly improves the disassembly and assembly efficiency of the partition 300.

[0038] To prevent pressurized oil from flowing back into the first branch channel 121, in one embodiment, such as Figure 3 As shown, a one-way valve 400 is provided in the first branch channel 121 to allow the pressurized oil to flow unidirectionally from the first oil inlet channel 111 to the first branch channel 121.

[0039] To prevent the hydraulic pressure in the first oil inlet channel 110 from exceeding the preset pressure value and to avoid damage to the working valve block, in one embodiment, such as Figure 2 As shown, the valve body 100 is also provided with an overflow channel 160, which connects the first oil inlet channel 111 and the first oil return channel 141. A pressure valve 500 is installed within the overflow channel 160. When the hydraulic pressure in the first oil inlet channel 111 exceeds a preset pressure value, the pressurized oil can open the pressure valve 500 and enter the first oil return channel 141. It should be noted that when the hydraulic pressure in the first oil inlet channel 111 does not exceed the preset pressure value, the pressurized oil cannot open the pressure valve 500 and enter the first oil return channel 141.

[0040] This application also provides a forklift, which includes a hydraulic pump, an actuating mechanism, an energy storage device, and a working valve block as described in any of the above embodiments. The oil inlet channel 110 is connected to the hydraulic pump, the working channel 120 is connected to the actuating mechanism, and the energy storage channel 130 is connected to the energy storage device. When the working channel 120 is connected to the oil inlet channel 110, pressurized hydraulic fluid can enter the working channel 120 from the oil inlet channel 110. When the working channel 120 is connected to the energy storage channel 130, pressurized hydraulic fluid can enter the energy storage channel 130 from the working channel 120, so as to store the kinetic energy of the pressurized hydraulic fluid in the energy storage device.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A valve block, characterized by The valve body (100) is provided with an oil inlet channel (110), a working channel (120) and an energy storage channel (130), the oil inlet channel (110) is used for connecting a hydraulic pump of a forklift, the working channel (120) is used for connecting a moving mechanism of the forklift, and the energy storage channel (130) is used for connecting an energy storage device of the forklift; when the working channel (120) is connected with the oil inlet channel (110), pressure oil can flow from the oil inlet channel (110) to the working channel (120); when the working channel (120) is connected with the energy storage channel (130), pressure oil can flow from the working channel (120) to the energy storage channel (130); the valve body (100) is further provided with an oil return channel (140), and the energy storage channel (130) is connected with the oil return channel (140) so as to store kinetic energy of pressure oil flowing back during lowering of a forklift mast in the energy storage device of the forklift. The valve body (100) is further provided with a valve cavity (150), and the valve block further comprises a valve rod (200) movably arranged in the valve cavity (150). The oil inlet channel (110) comprises a first oil inlet channel (111) and a second oil inlet channel (112), the working channel (120) comprises a first branch channel (121) and a second branch channel (122), the first branch channel (121) and the second branch channel (122) share an outlet at an end away from the valve cavity (150), the oil return channel (140) comprises a first oil return channel (141) and a second oil return channel (142), and the second oil return channel (142) is connected with the energy storage channel (130). When the valve rod (200) is in a first position, the first oil inlet channel (111) is connected with the first branch channel (121) through the valve cavity (150), and the second oil inlet channel (112) is connected with the second branch channel (122) through the valve cavity (150), so that the first oil inlet channel (111) and the second oil inlet channel (112) simultaneously supply oil. When the valve rod (200) is in a second position, the second branch channel (122) is connected with the second oil return channel (142) through the valve cavity (150), so that pressure oil in the second branch channel (122) flows to the energy storage device through the second oil return channel (142) and the energy storage channel (130). When the valve rod (200) is in a third position, the first oil inlet channel (111) is connected with the first oil return channel (141) through the valve cavity (150) to complete oil return.

2. The valve block of claim 1, wherein, The valve body (100) is further provided with a variable channel (170) capable of connecting the first oil return channel (141) and the second oil return channel (142), and a partition member (300) is arranged in the variable channel (170).

3. The valve block of claim 2, wherein, The partition member (300) is detachably arranged in the variable channel (170).

4. The valve block of claim 2, wherein, The partition member (300) is screwed with the inner wall of the variable channel (170), and one side of the partition member (300) is provided with an inner hexagonal hole (310).

5. The valve block of claim 1, wherein, The first branch channel (121) is provided with a one-way valve (400) to enable one-way flow of pressure oil from the first oil inlet (111) to the first branch channel (121).

6. The valve block of claim 1, wherein, The valve body (100) is further provided with an overflow channel (160) capable of connecting the first oil inlet (111) and the first oil return (141), and the overflow channel (160) is provided with a pressure valve (500), which can be opened by pressure oil when the hydraulic value in the first oil inlet (111) exceeds a preset pressure value to enable pressure oil to enter the first oil return (141).

7. A fork lift truck characterised by The hydraulic system comprises a liquid pump, a moving mechanism, an energy storage device, and the working valve block as claimed in any one of claims 1-6, the oil inlet channel (110) is connected with the liquid pump, the working channel (120) is connected with the moving mechanism, and the energy storage channel (130) is connected with the energy storage device, when the working channel (120) is connected with the oil inlet channel (110), pressure oil can enter the working channel (120) from the oil inlet channel (110), and when the working channel (120) is connected with the energy storage channel (130), pressure oil can enter the energy storage channel (130) from the working channel (120) to store kinetic energy of the pressure oil in the energy storage device.

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