Work valve block and brake energizing system

Abstract

The application relates to a working valve block and a brake energy supply system. The working valve block comprises an oil inlet valve, an accumulator and a three-way valve. The accumulator is connected to the oil inlet valve and the three-way valve respectively. Pressure oil can enter the accumulator through the oil inlet valve, and the pressure oil can leave the accumulator through the three-way valve. A sealing valve is arranged between the three-way valve and the accumulator, and is used for controlling the on-off of the three-way valve and the accumulator. The working valve block and the brake energy supply system provided by the application solve the problem that the three-way valve is prone to leakage.

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 braking power supply system. 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] Forklifts inevitably start and stop during operation, and external energy is required to release the brakes. To better provide the energy needed for braking or releasing the brakes, forklifts are typically equipped with a braking power supply system. This system includes a motor, hydraulic pump, drive unit, return oil device, and accumulator. The hydraulic pump is connected to the accumulator, and the motor is connected to the hydraulic pump. When the braking power supply system is charging, the motor drives the hydraulic pump to pump pressurized hydraulic fluid into the accumulator, converting the forklift's kinetic energy into compressive energy stored in the accumulator. Furthermore, the accumulator can be connected to either the drive unit or the return oil device. Specifically, when the forklift restarts, the drive unit connects to the accumulator, which pressurizes the drive unit to drive it. At this time, the compressed energy stored in the accumulator is converted into kinetic energy and transferred to the forklift's drive unit, thus releasing the brakes. When the return oil device is connected to the accumulator, the pressurized hydraulic fluid in the accumulator can return to the accumulator, completing the circulation of the pressurized hydraulic fluid. Typically, an accumulator has a three-way valve at its outlet, through which pressurized oil can leave the accumulator. The three-way valve is also used to control the flow of pressurized oil into the drive unit or the return unit. However, the three-way valve has poor sealing performance, and the hydraulic pressure at the accumulator outlet is relatively high. Therefore, pressurized oil is prone to leakage at the three-way valve. Summary of the Invention

[0004] Therefore, it is necessary to provide a working valve block and a braking power supply system to solve the problem of leakage that easily occurs in three-way valves.

[0005] The working valve block provided in this application includes an oil inlet valve, an accumulator, and a three-way valve. The accumulator is connected to both the oil inlet valve and the three-way valve. Pressurized oil can enter the accumulator through the oil inlet valve and leave the accumulator through the three-way valve. A sealing valve is also provided between the three-way valve and the accumulator. The sealing valve is used to control the on / off state of the three-way valve and the accumulator.

[0006] In one embodiment, the working valve block further includes a valve body. An inlet valve, an accumulator, and a three-way valve are respectively installed in the valve body. The valve body has a main inlet channel and a main outlet channel. The main inlet channel is used to connect the hydraulic pump and the accumulator of the braking power supply system. The inlet valve is installed in the main inlet channel to control the opening and closing of the main inlet channel. The main outlet channel has a first outlet and a second outlet. The three-way valve is installed in the main outlet channel to control the accumulator to connect to the drive device of the braking power supply system through the first outlet of the main outlet channel, or to control the accumulator to connect to the return oil device of the braking power supply system through the second outlet of the main outlet channel.

[0007] In one embodiment, the sealing valve is a two-way, two-position normally closed solenoid valve. It is understood that this configuration improves the sealing effect and control efficiency of the working valve block.

[0008] In one embodiment, the main oil outlet channel includes a first section and a second section arranged vertically, and the sealing valve has a connection between the first section and the second section. It is understood that this arrangement helps reduce the difficulty of installing the sealing valve.

[0009] In one embodiment, the second channel is located at the end of the main oil outlet channel near the three-way valve, and extends away from the three-way valve, forming a machined opening on the surface of the valve body. A second high-pressure plug is provided at the machined opening. It is understood that this arrangement helps reduce the machining difficulty of the second channel.

[0010] In one embodiment, the accumulator is a spring-type accumulator, or a piston-type accumulator, or a gas-type accumulator.

[0011] In one embodiment, the valve body is further provided with a brake oil outlet channel, through which the accumulator can be connected to the braking device of the brake power supply system. A first high-pressure plug, detachably connected, is provided at the opening of the brake oil outlet channel on the surface of the valve body. It is understood that with this configuration, the working valve block can provide energy to the forklift's braking device, thereby assisting the braking device in braking the forklift.

[0012] In one embodiment, the inlet valve is detachably connected to the valve body, and / or, the three-way valve is detachably connected to the valve body, and / or, the accumulator is detachably connected to the valve body. It is understood that this arrangement facilitates the maintenance and replacement of the working valve block.

[0013] In one embodiment, a first sealing ring is provided at the connection between the oil inlet valve and the valve body, and / or, a second sealing ring is provided at the connection between the three-way valve and the valve body. It is understood that this arrangement helps improve the sealing performance of the working valve block.

[0014] This application also provides a braking power supply system, which includes a motor, a hydraulic pump, a drive device, a return oil device, and a working valve block as described in any of the above embodiments. The hydraulic pump is connected to the working valve block, and the motor is connected to the hydraulic pump to drive the hydraulic pump to pump pressurized oil into the working valve block. The working valve block can be connected to the drive device or the return oil device. When the drive device is connected to the working valve block, the working valve block can pressurize oil into the drive device to drive the drive device to operate. When the return oil device is connected to the working valve block, the pressurized oil in the working valve block can enter the return oil device for return oil.

[0015] Compared with the prior art, the working valve block and braking power supply system provided in this application further improve the connection sealing between the three-way valve and the accumulator by setting a sealing valve. The pressure of the pressure oil acts directly on the sealing valve instead of the three-way valve, effectively avoiding leakage of the three-way valve. 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 cross-sectional view of the working valve block provided for this application;

[0018] Figure 2 Piping diagram of the working valve block provided in this application.

[0019] Reference numerals: 100, Inlet valve; 110, First sealing ring; 200, Accumulator; 300, Three-way valve; 310, Second sealing ring; 400, Sealing valve; 500, Valve body; 510, Main inlet channel; 511, First stop step; 512, Inlet interval; 520, Main outlet channel; 530, First outlet; 540, Second outlet; 550, First section channel; 560, Second section channel; 570, Machining port; 571, Second high-pressure plug; 580, Overflow channel; 590, Brake outlet channel; 591, First high-pressure plug; 600, One-way fluid inlet structure; 610, Valve seat; 611, Intermediate channel; 612, Inlet; 613, Second stop step; 620, Elastic element; 630, Movable plug; 700, Pressure switch; 800, Overflow valve. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Forklifts inevitably start and stop during operation, and external energy is required to release the brakes. To better provide the energy needed for braking or releasing the brakes, forklifts are typically equipped with a braking power supply system. This system includes a motor (not shown), a hydraulic pump (not shown), a drive unit (not shown), a return oil device (not shown), and an accumulator 200. The hydraulic pump is connected to the accumulator 200, and the motor is connected to the hydraulic pump. When the braking power supply system is charging, the motor drives the hydraulic pump to pump pressurized hydraulic fluid into the accumulator 200, so that the kinetic energy of the forklift is converted into compressive energy and stored in the accumulator 200. Furthermore, the accumulator 200 can be connected to either the drive unit or the return oil device. Specifically, when the forklift restarts, the drive unit connects to the accumulator 200, allowing the accumulator 200 to inject pressurized oil into the drive unit to drive its operation. At this time, the compressed energy stored in the accumulator 200 is converted into kinetic energy through the pressurized oil and transferred to the forklift's drive unit, thus releasing the forklift's brakes. When the return oil device connects to the accumulator 200, the pressurized oil in the accumulator 200 can enter the return oil device for return, thus completing the circulation of the pressurized oil. Typically, the accumulator 200's outlet end is equipped with a three-way valve 300, through which pressurized oil can leave the accumulator 200. The three-way valve 300 is used to control the flow of pressurized oil into the drive unit or the return oil device. However, the three-way valve 300 has poor sealing performance, and the hydraulic pressure at the accumulator 200's outlet end is relatively high; therefore, pressurized oil is prone to leakage at the three-way valve 300.

[0028] Please see Figure 1 and Figure 2 To address the leakage problem of the three-way valve 300, this application provides a working valve block comprising an inlet valve 100, an accumulator 200, and a three-way valve 300. The accumulator 200 is connected to both the inlet valve 100 and the three-way valve 300. Pressurized oil can enter the accumulator 200 through the inlet valve 100 and exit the accumulator 200 through the three-way valve 300. A sealing valve 400 is also provided between the three-way valve 300 and the accumulator 200 to control the opening and closing of the three-way valve 300 and the accumulator 200. By providing the sealing valve 400, the sealing performance between the three-way valve 300 and the accumulator 200 is further improved. The pressure of the pressurized oil acts directly on the sealing valve 400 instead of the three-way valve 300, effectively preventing leakage from the three-way valve 300.

[0029] Furthermore, the sealing valve 400 is a two-way, two-position, normally closed solenoid valve. A two-way, two-position, normally closed solenoid valve has only two states: open and closed. Compared to the three-way valve 300, its function is more singular and its structure is simpler. Therefore, the two-way, two-position, normally closed solenoid valve has better sealing performance, which is beneficial for further improving the sealing effect of the working valve block. In addition, the two-way, two-position, normally closed solenoid valve can greatly improve the control efficiency of the working valve block.

[0030] One or more switching valves are installed between the liquid pump and the accumulator 200, between the drive unit and the accumulator 200, and between the oil return device and the accumulator 200. The accumulator 200 and the switching valves are all connected by pipelines, and the accumulator 200 and the multiple switching valves are located at different positions on the forklift, which increases the installation difficulty of the accumulator 200 and the multiple switching valves.

[0031] Please see Figure 1 and Figure 2 To reduce the installation difficulty of the accumulator 200 and multiple switching valves, this application provides a working valve block. The working valve block includes a valve body 500, an inlet valve 100, an accumulator 200, and a three-way valve 300. The inlet valve 100, the accumulator 200, and the three-way valve 300 are respectively installed in the valve body 500. The valve body 500 is provided with a main inlet channel 510 and a main outlet channel 520. The main inlet channel 510 is used to connect the hydraulic pump of the braking power supply system and the accumulator 200. The inlet valve 100 is installed in the main inlet channel 510 to control the opening and closing of the main inlet channel 510. The main oil outlet channel 520 has a first oil outlet 530 and a second oil outlet 540. A three-way valve 300 is installed in the main oil outlet channel 520 to control the accumulator 200 to connect to the drive device of the braking power supply system through the first oil outlet 530 of the main oil outlet channel 520, or to control the accumulator 200 to connect to the return oil device of the braking power supply system through the second oil outlet 540 of the main oil outlet channel 520. By setting up a valve body 500, and installing the oil inlet valve 100, accumulator 200 and three-way valve 300 on the valve body 500 respectively, the assembly of the working valve block can be completed first, and then the entire working valve block can be installed in the braking power supply system. Moreover, compared with the prior art, the oil inlet valve 100, accumulator 200 and three-way valve 300, the accumulator 200 and the drive device, the accumulator 200 and the return oil device, and the accumulator 200 and the liquid pump are all connected through the channels in the valve body 500, which further reduces the installation difficulty of the accumulator 200 and multiple switching valves.

[0032] The braking power supply system provided in this application includes a motor, a hydraulic pump, a drive unit, a return oil device, and a working valve block, all equipped with a working valve block. The hydraulic pump is connected to the working valve block, and the motor is connected to the hydraulic pump. When the braking power supply system is charging, the motor drives the hydraulic pump to pump pressurized hydraulic fluid into the working valve block, converting the forklift's kinetic energy into compressive energy stored within the working valve block. Furthermore, the working valve block can be connected to either the drive unit or the return oil device. Specifically, when the forklift restarts, the drive unit connects to the working valve block, allowing the working valve block to pressurize hydraulic fluid into the drive unit, driving its operation. At this time, the compressive energy stored in the working valve block is converted into kinetic energy through the pressurized hydraulic fluid and transmitted to the forklift's drive unit, thus releasing the forklift from braking. When the return oil device connects to the working valve block, the pressurized hydraulic fluid within the working valve block can enter the return oil device for return, thereby completing the circulation of the pressurized hydraulic fluid. It should be noted that braking power supply systems can be used not only on forklifts, but also on other vehicles, such as excavators, loaders, or transport vehicles. However, they are not limited to these; braking power supply systems can also be used on agricultural vehicles, such as rice transplanters, etc. These will not be listed here.

[0033] Although the inlet valve 100 can prevent pressurized oil from flowing back from the accumulator 200 to the main inlet channel 510, the hydraulic pressure of the pressurized oil coming out of the accumulator 200 is relatively high. Under the long-term impact of the pressurized oil, the inlet valve 100 is prone to damage.

[0034] Please see Figure 1 and Figure 2 To reduce damage to the inlet valve 100, the working valve block provided in this application also includes a one-way fluid inlet structure 600. The one-way fluid inlet structure 600 is located at one end of the main inlet channel 510 near the accumulator 200, so that the pressurized oil flows unidirectionally from the main inlet channel 510 to the accumulator 200. By setting the one-way fluid inlet structure 600, the pressurized oil flowing back towards the inlet valve 100 is stopped at the one-way fluid inlet structure 600, avoiding the inlet valve 100 from being impacted by the pressurized oil, and greatly reducing the probability of damage to the inlet valve 100.

[0035] The one-way fluid inlet structure 600 includes a valve seat 610, an elastic element 620, and a movable plug 630. Typically, the movable plug 630 and the elastic element 620 are located within the valve seat 610. Pressurized oil pushes open the movable plug 630 and enters the one-way fluid inlet structure 600 through the gap between the movable plug 630 and the valve seat 610. The pressurized oil flows at a relatively high velocity. When the pressurized oil passes through the gap between the movable plug 630 and the valve seat 610, it causes the movable plug 630 to vibrate, resulting in noise from the working valve block. Furthermore, the vibration of the movable plug 630 significantly affects the oil inlet efficiency of the one-way fluid inlet structure 600, thereby reducing the working efficiency of the working valve block.

[0036] To improve the oil inlet efficiency of the one-way liquid inlet structure 600 and reduce its noise, in one embodiment, such as Figure 1 As shown, the main oil inlet channel 510 is provided with a first stop step 511. The one-way liquid inlet structure 600 includes a valve seat 610, an elastic element 620, and a movable plug 630. The valve seat 610 is provided with an intermediate channel 611 connecting the accumulator 200. The elastic element 620 is disposed in the intermediate channel 611. The movable plug 630 is movably disposed between the valve seat 610 and the first stop step 511. The elastic element 620 has the tendency to push the movable plug 630 against the first stop step 511 and seal it with the first stop step 511 to block the main oil inlet channel 510. An oil inlet gap 512 is provided between the outer side of the valve seat 610 and the inner side of the main oil inlet channel 510. The side wall of the valve seat 610 is provided with one or more oil inlets 612 connecting the intermediate channel 611 and the oil inlet gap 512. The intermediate channel 611 can connect to the main oil inlet channel 510 through the oil inlets 612 and the oil inlet gap 512. It should be noted that the oil inlet interval 512 is distributed at the end and side of the valve seat 610.

[0037] Thus, when no pressurized oil enters the main oil inlet channel 510, the elastic element 620 pushes the movable plug 630 against the first stop step 511 and seals with it, thereby blocking the main oil inlet channel 510. When pressurized oil enters the main oil inlet channel 510, the pressurized oil directly pushes open the movable plug 630 at the first stop step 511. Then, the pressurized oil enters the inlet port 612 through the inlet gap 512 between the outer side of the valve seat 610 and the inner side of the main oil inlet channel 510, and finally enters the intermediate channel 611 from the inlet port 612 until it enters the accumulator 200. As can be seen from the above, the pressurized oil does not pass through the gap between the movable plug 630 and the valve seat 610. Therefore, the pressurized oil will not cause the movable plug 630 to vibrate or generate noise. Furthermore, when the pressurized oil passes through the oil inlet gap 512 between the outer side of the valve seat 610 and the inner side of the main oil inlet channel 510, as well as the oil inlet 612 on the side wall of the valve seat 610, the flow rate of the pressurized oil can remain stable, which greatly improves the oil inlet efficiency of the pressurized oil.

[0038] To ensure the stability of the movable plug 630 during liquid inlet inlet 600, in one embodiment, such as Figure 1As shown, to improve the performance of the one-way valve seat 610, a second stop step 613 is provided at one end near the first stop step 511. The movable plug 630 can abut against the second stop step 613 and seal against it to block the intermediate channel 611. Thus, when the one-way liquid inlet structure 600 is filled, no pressurized oil passes between the movable plug 630 and the valve seat 610, and since the movable plug 630 abuts against the second stop step 613, the movable plug 630 can remain stable.

[0039] To further improve the stability of the movable plug 630 during liquid inlet inlet of the unidirectional liquid inlet structure 600, in one embodiment, such as Figure 1 As shown, to improve the sealing effect of the unidirectional intermediate channel 611, an inner conical surface is provided at one end near the first stop step 511 to form a second stop step 613. The movable plug 630 is spherical and can seal with the inner conical surface. The spherical movable plug 630 and the inner conical surface have a better sealing effect, and the inner conical surface can effectively fix the movable plug 630 to prevent the movable plug 630 from vibrating.

[0040] To reduce the machining difficulty of the unidirectional liquid inlet structure 600, in one embodiment, multiple oil inlets 612 are evenly distributed along the circumference of the valve seat 610.

[0041] To reduce the flow rate of the pressurized oil without changing its flow rate, in one embodiment, the sum of the cross-sectional areas of the plurality of inlets 612 is greater than or equal to the minimum cross-sectional area of ​​the main inlet channel 510. Similarly, to reduce the flow rate of the pressurized oil without changing its flow rate, in one embodiment, the cross-sectional area of ​​the inlet interval 512 is greater than or equal to the minimum cross-sectional area of ​​the main inlet channel 510. As a physical formula states, flow rate equals flow velocity multiplied by cross-sectional area; therefore, with a constant flow rate, increasing the cross-sectional area helps to reduce the flow velocity.

[0042] To reduce the installation difficulty of the sealing valve 400, in one embodiment, such as Figure 1 As shown, to improve the one-way main oil outlet channel 520, which includes a vertically arranged first channel 550 and a second channel 560, the sealing valve 400 is provided with a connection between the first channel 550 and the second channel 560. Thus, the sealing valve 400 can be inserted into the first channel 550 from one end, or into the second channel 560 from one end, greatly reducing the installation difficulty of the sealing valve 400.

[0043] To reduce the processing difficulty of the second channel 560, in one embodiment, such as Figure 1As shown, the second channel 560 is located at the end of the main oil outlet channel 520 near the three-way valve 300, and the second channel 560 extends away from the three-way valve 300, forming a machining port 570 on the surface of the valve body 500. A second high-pressure plug 571 is provided at the machining port 570. In this way, the second channel 560 can be directly machined from the machining port 570, which greatly reduces the machining difficulty of the second channel 560.

[0044] To maintain the hydraulic pressure within the working valve block and accumulator 200 within a certain range and prevent damage to the working valve block and accumulator 200, in one embodiment, such as Figure 1 As shown, the working valve block also includes a pressure switch 700. The pressure switch 700 is electrically connected to the motor of the braking power supply system. The pressure switch 700 is located at one end of the accumulator 200 near the main oil inlet channel 510. When the hydraulic pressure value of the pressurized oil entering the accumulator 200 is greater than the preset pressure value, the pressure switch 700 can control the motor of the braking power supply system to stop working, thereby controlling the hydraulic pump of the braking power supply system to stop pumping pressurized oil into the main oil inlet channel 510. Further, the pressure switch 700 includes a pressure sensor (not shown) and a control module (not shown). The control module is electrically connected to the pressure switch 700 and the motor respectively. The pressure sensor is used to detect the hydraulic pressure value on the side of the accumulator 200 near the main oil inlet channel 510. When the hydraulic pressure value of the pressurized oil entering the accumulator 200 is greater than the preset pressure value, the pressure sensor transmits the pressure data to the control module. The control module then controls the motor of the braking power supply system to stop working, thereby controlling the hydraulic pump of the braking power supply system to stop pumping pressurized oil into the main oil inlet channel 510.

[0045] When the pressure switch 700 fails or malfunctions, in order to prevent the accumulator 200 from being damaged by continuous pressure from the hydraulic fluid, in one embodiment, such as Figure 1 As shown, the valve body 500 also includes an overflow channel 580, which connects to the main oil inlet channel 510 and the second oil outlet 540. An overflow valve 800 is installed at the overflow channel 580 to control its opening and closing. Thus, when the hydraulic pressure in the main oil inlet channel 510 exceeds a preset pressure value, the pressurized oil can open the overflow valve 800 and overflow from the overflow channel 580 to the second oil outlet 540, thereby ensuring that the hydraulic pressure in the main oil inlet channel 510 does not exceed the preset pressure value. Furthermore, the overflow valve 800 is installed inside the valve body 500 and is detachably connected to the valve body 500.

[0046] In one embodiment, the accumulator 200 is a spring-type accumulator, or a piston-type accumulator, or a gas-type accumulator. A spring-type accumulator stores the hydraulic energy of pressurized oil by compressing a spring, converting it into spring potential energy. Conversely, a spring-type accumulator can also convert the spring potential energy of a compressed spring into the hydraulic energy of pressurized oil. Spring-type accumulators have a simple structure, which helps reduce the manufacturing cost of the working valve block. A piston-type accumulator stores the hydraulic energy of pressurized oil by lifting a mass block loaded on a sealed piston, converting it into gravitational potential energy. Conversely, a piston-type accumulator can also convert the gravitational potential energy of a mass block into the hydraulic energy of pressurized oil. Piston-type accumulators have a simple structure and stable pressure, which helps improve the stability of the working valve block. Gas accumulators convert energy by compressing gas. When in use, gas at a predetermined pressure is first charged into the gas accumulator. When the hydraulic pressure of the hydraulic fluid exceeds the internal pressure of the gas accumulator, the hydraulic fluid compresses the gas, converting the hydraulic energy in the hydraulic fluid into the compressible energy of the gas. When the hydraulic pressure of the hydraulic fluid is lower than the internal pressure of the gas accumulator, the hydraulic fluid in the gas accumulator flows out under the action of high-pressure gas, thereby releasing energy.

[0047] In one embodiment, the inlet valve 100 is a two-way, two-position normally closed solenoid valve. When not energized, the inlet valve 100 closes the main inlet channel 510. Similarly, in one embodiment, the three-way valve 300 is a three-way, two-position normally closed solenoid valve. This significantly improves the control efficiency of the inlet valve 100 and the three-way valve 300.

[0048] In order for the working valve block to provide energy to the forklift's braking device (not shown), thereby assisting the braking device in braking the forklift, in one embodiment, such as Figure 1 As shown, the valve body 500 is also provided with a brake oil outlet passage 590. The accumulator 200 can be connected to the braking device of the brake power supply system through the brake oil outlet passage 590, thereby assisting the braking device in braking the forklift. Furthermore, the brake oil outlet passage 590 has a detachable first high-pressure plug 591 at the opening on the surface of the valve body 500. When the brake oil outlet passage 590 is in standby mode, the first high-pressure plug 591 firmly seals the brake oil outlet passage 590. When the brake oil outlet passage 590 is in use mode, the first high-pressure plug 591 can be removed to open the brake oil outlet passage 590.

[0049] To facilitate the maintenance and replacement of the working valve block, in one embodiment, the inlet valve 100 is detachably connected to the valve body 500. Similarly, in one embodiment, the three-way valve 300 is detachably connected to the valve body 500. Likewise, in one embodiment, the accumulator 200 can also be detachably connected to the valve body 500. However, this is not a limitation; the inlet valve 100 and valve body 500 can also be fixedly connected, as can the three-way valve 300 and valve body 500, and the accumulator 200 can also be fixedly connected to the valve body 500.

[0050] To improve the sealing performance of the working valve block, in one embodiment, such as Figure 1 As shown, a first sealing ring 110 is provided at the connection between the oil inlet valve 100 and the valve body 500. The first sealing ring 110 is sleeved on the outer periphery of the oil inlet valve 100. Similarly, in one embodiment, a second sealing ring 310 is provided at the connection between the three-way valve 300 and the valve body 500. The second sealing ring 310 is sleeved on the outer periphery of the three-way valve 300.

[0051] 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.

[0052] 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 working valve block, characterized in that, The device includes an inlet valve (100), an accumulator (200), and a three-way valve (300). The accumulator (200) is connected to the inlet valve (100) and the three-way valve (300). Pressurized oil can enter the accumulator (200) through the inlet valve (100) and exit the accumulator (200) through the three-way valve (300). A sealing valve (400) is also provided between the three-way valve (300) and the accumulator (200). The sealing valve (400) is used to control the opening and closing of the three-way valve (300) and the accumulator (200). It also includes a valve body (500), wherein the oil inlet valve (100), the accumulator (200) and the three-way valve (300) are respectively installed in the valve body (500), the valve body (500) is provided with a main oil inlet channel (510) and a main oil outlet channel (520), the main oil inlet channel (510) is used to connect the hydraulic pump of the braking power supply system and the accumulator (200), and the oil inlet valve (100) is installed in the main oil inlet channel (510) to control the opening and closing of the main oil inlet channel (510); The working valve block also includes a one-way liquid inlet structure (600), which is located at one end of the main oil inlet channel (510) near the accumulator (200) so that the pressurized oil flows unidirectionally from the main oil inlet channel (510) to the accumulator (200). The main oil inlet channel (510) is provided with a first stop step (511). The one-way liquid inlet structure (600) includes a valve seat (610), an elastic element (620), and a movable plug (630). The valve seat (610) is provided with an intermediate channel (611) connecting to the accumulator (200). The elastic element (620) is located in the intermediate channel (611). The movable plug (630) is movably located between the valve seat (610) and the first stop step (511). The elastic element (620) has the function of pushing the movable plug. The head (630) abuts against the first stop step (511) and is sealed with the first stop step (511); an oil inlet interval (512) is provided between the outer side of the valve seat (610) and the inner side of the main oil inlet channel (510), and the side wall of the valve seat (610) is provided with one or more oil inlets (612) connecting the intermediate channel (611) and the oil inlet interval (512), and the intermediate channel (611) can be connected to the main oil inlet channel (510) through the oil inlet (612) and the oil inlet interval (512); The middle channel (611) has an inner conical surface at one end near the first stop step (511) to form a second stop step (613). The movable plug (630) is spherical and can seal with the inner conical surface. When no pressurized oil enters the main oil inlet channel (510), the elastic element (620) pushes the movable plug (630) against the first stop step (511) and seals with the first stop step (511) to block the main oil inlet channel (510); when pressurized oil enters the main oil inlet channel (510), the pressurized oil directly pushes open the movable plug (630) at the first stop step (511) and then the pressurized oil enters the inlet port (612) through the inlet gap (512) between the outer side of the valve seat (610) and the inner side of the main oil inlet channel (510), and finally enters the intermediate channel (611) from the inlet port (612) until it enters the accumulator (200).

2. The working valve block according to claim 1, characterized in that, The main oil outlet channel (520) has a first oil outlet (530) and a second oil outlet (540). The three-way valve (300) is installed in the main oil outlet channel (520) to control the accumulator (200) to connect to the drive device of the braking power supply system through the first oil outlet (530) of the main oil outlet channel (520), or to control the accumulator (200) to connect to the return oil device of the braking power supply system through the second oil outlet (540) of the main oil outlet channel (520).

3. The working valve block according to claim 2, characterized in that, The main oil outlet channel (520) includes a first channel (550) and a second channel (560) arranged vertically, and the sealing valve (400) is provided with a connection between the first channel (550) and the second channel (560).

4. The working valve block according to claim 3, characterized in that, The second channel (560) is located at one end of the main oil outlet channel (520) near the three-way valve (300), and the second channel (560) extends away from the three-way valve (300) and forms a machining port (570) on the surface of the valve body (500). A second high-pressure plug (571) is provided at the machining port (570).

5. The working valve block according to claim 2, characterized in that, The valve body (500) is also provided with a brake oil outlet channel (590), and the accumulator (200) can be connected to the braking device of the braking power supply system through the brake oil outlet channel (590). The brake oil outlet channel (590) is provided with a first high-pressure plug (591) that can be detachably connected at the opening on the surface of the valve body (500).

6. The working valve block according to claim 2, characterized in that, The oil inlet valve (100) is detachably connected to the valve body (500), and / or the three-way valve (300) is detachably connected to the valve body (500), and / or the accumulator (200) is detachably connected to the valve body (500).

7. The working valve block according to claim 2, characterized in that, A first sealing ring (110) is provided at the connection between the oil inlet valve (100) and the valve body (500), and / or a second sealing ring (310) is provided at the connection between the three-way valve (300) and the valve body (500).

8. The working valve block according to claim 1, characterized in that, The sealing valve (400) is a two-way, two-position normally closed solenoid valve.

9. The working valve block according to claim 1, characterized in that, The accumulator (200) is a spring-type accumulator, or the accumulator (200) is a piston-type accumulator, or the accumulator (200) is a gas-type accumulator.

10. A braking power supply system, characterized in that, The device includes a motor, a hydraulic pump, a drive unit, a return oil device, and a working valve block as described in any one of claims 1-9. The hydraulic pump is connected to the working valve block, and the motor is connected to the hydraulic pump to drive the hydraulic pump to pump pressurized oil into the working valve block. The working valve block can be connected to either the drive unit or the return oil device. When the drive unit is connected to the working valve block, the working valve block can pressurize oil into the drive unit to drive the drive unit to operate. When the return oil device is connected to the working valve block, the pressurized oil in the working valve block can enter the return oil device for return oil.

Images