Oil cylinder control valve and scissor type aerial work platform

Abstract

The invention provides an oil cylinder control valve and a scissor type aerial work platform. The control valve is characterized in that a control valve body is provided with a working connector and an oil cylinder connector; the electromagnetic valve is arranged on the control valve body; the emergency hand-operating mechanism is connected with the electromagnetic valve in parallel and independently arranged on one side of the electromagnetic valve in the radial direction of the electromagnetic valve. The emergency manual mechanism and the electromagnetic valve are completely separated from each other on a physical structure and are independently arranged on one side of the electromagnetic valve in the radial direction of the electromagnetic valve to form a parallel layout instead of a traditional embedded penetrating type structure, interference or damage of the emergency manual mechanism to an internal oil way of the electromagnetic valve is avoided, the internal oil way structure of the control valve body is simplified, and the service life of the control valve body is prolonged. The processing technology difficulty and the manufacturing cost are reduced; and meanwhile, potential leakage channel and clamping stagnation risks caused by penetration pieces are eliminated, and the sealing reliability and the action stability of the electromagnetic valve are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic equipment technology, and more specifically, to a cylinder control valve and a scissor lift aerial work platform. Background Technology

[0002] A scissor lift aerial work platform is a specialized piece of equipment widely used in construction, equipment installation, and warehousing logistics. It utilizes a hydraulic system to extend or fold the scissor boom, enabling the platform to rise and fall vertically. Within the hydraulic system, the descent control valve is a key component for ensuring smooth platform descent. It is typically installed on the hydraulic line of the lower cylinder and is used to control the opening and closing of the hydraulic fluid flow path or to switch between different fluid flow paths.

[0003] Currently, most commercially available hydraulic cylinder control valves integrate solenoid valves with mechanical emergency devices. To meet safety regulations regarding platform descent in emergency situations, these control valves typically integrate an emergency button mechanism. Chinese patent application CN212899200U discloses a cartridge solenoid valve, including a control valve body assembly, a valve core assembly, and an electromagnetic drive assembly. The valve core assembly and the electromagnetic drive assembly are housed within the cavity of the control valve body assembly. When a coil generates a changing induced magnetic field, the electromagnetic drive assembly moves within the cavity of the control valve body assembly and drives the valve core assembly. The electromagnetic drive assembly also includes a pull rod, a second connecting pin, and a first elastic element. The pull rod is movably disposed within the cavity, with one end connected to a moving iron and capable of moving the pilot valve core. The moving iron has a third pin groove on the side of the first pin groove relatively far from the pilot valve core, and the second connecting pin passes through the third pin groove. The first elastic element is disposed within a mounting through hole, with one end abutting against the end of the pull rod and the other end abutting against the second connecting pin. The pull rod partially extends into the mounting through hole. The end of the pull rod extending into the mounting through hole is equipped with a pull rod head. The end of the mounting through hole near the pull rod has a constricted portion. The inner diameter of the constricted portion allows the pull rod to move within the mounting through hole and is smaller than the outer diameter of the pull rod head. Therefore, during the pulling of the pull rod, the pull rod head can drive the moving iron to move along the pilot valve core away from the main valve core, thereby causing the pilot valve core to disengage from the main valve core and release from contact with the main valve core.

[0004] However, in the aforementioned technical solution, the emergency button mechanism, i.e., the pull rod, is structurally designed to penetrate the solenoid valve control valve body to enable manual mechanical operation in the event of a power outage. Because the emergency button mechanism needs to extend from the outside of the control valve body and penetrate to the internal valve core, the internal oil circuit structure of the control valve body becomes complex, increasing the difficulty of manufacturing. This not only raises manufacturing costs but also increases the risk of hydraulic oil leakage due to the presence of the internal penetrating component. Furthermore, the complex internal structure reduces the reliability of the solenoid valve, making it prone to malfunctions such as jamming or poor sealing, affecting the smoothness of the platform's descent and control accuracy, thereby impacting the overall safety performance and service life of the machine. Summary of the Invention

[0005] In view of this, the present invention proposes a hydraulic cylinder control valve and a scissor lift aerial work platform, aiming to solve the problem of low reliability of existing solenoid valves caused by the emergency button mechanism penetrating through the valve body of the solenoid valve control valve.

[0006] On one hand, the present invention proposes a hydraulic cylinder control valve, which includes: a control valve body having a working connection port and a hydraulic cylinder connection port; a solenoid valve disposed on the control valve body for responding to an electrical signal to control the on / off or flow direction switching of the oil passage between the working connection port and the hydraulic cylinder connection port on the control valve body; and an emergency manual mechanism disposed in parallel with the solenoid valve and independently disposed on one side of the solenoid valve along its radial direction, for manually controlling the on / off of the oil passage between the working connection port and the hydraulic cylinder connection port when the solenoid valve fails, so that the oil at the hydraulic cylinder connection port can flow out from the working connection port.

[0007] Further, the emergency manual mechanism of the aforementioned hydraulic cylinder control valve includes: an emergency valve assembly, which has a first emergency interface communicating with the working connection port and a second emergency interface communicating with the hydraulic cylinder connection port; the emergency valve assembly has an emergency valve hole arranged axially therein, and the first emergency interface and the second emergency interface are both connected to the emergency valve hole; an emergency valve core, which is slidably disposed in the emergency valve hole along the axial direction of the emergency valve hole, for abutting against or moving away from the first emergency interface, so that the emergency valve core opens or closes the first emergency interface accordingly, thereby connecting or cutting off the first emergency port and the second emergency port accordingly; and an emergency pull rod, which is slidably disposed on the emergency valve assembly, with a first end disposed in the emergency valve hole connected to the emergency valve core, and a second end disposed outside the emergency valve hole serving as an operating end for receiving manual operating force, for pulling the emergency valve core to move it away from the first emergency interface, thereby realizing the connection between the first emergency interface and the emergency valve hole, and thus realizing the connection between the first emergency interface and the second emergency interface.

[0008] Furthermore, in the aforementioned hydraulic cylinder control valve, an emergency elastic element is provided between the emergency valve core and the emergency valve assembly to apply elastic force to the emergency valve core, so that the emergency valve core abuts against the first emergency interface in a free state, thereby closing the first emergency interface, cutting off the connection between the first emergency interface and the emergency valve hole, and further cutting off the connection between the first emergency interface and the second emergency interface.

[0009] Furthermore, in the aforementioned hydraulic cylinder control valve, the first emergency interface is located at the axial end of the emergency valve assembly and is coaxially arranged with the emergency valve hole; the sealing end of the emergency valve core is provided with a sealing structure for abutting and sealing at the first emergency interface; the follower end of the emergency valve core is provided with a slot, and the first end of the emergency pull rod is located in the slot for pulling the emergency valve core to slide along the emergency valve hole.

[0010] Furthermore, in the aforementioned hydraulic cylinder control valve, the first emergency interface is a damping port used to control the hydraulic fluid flow rate in order to control the descent speed of the aerial work platform.

[0011] Further, in the aforementioned hydraulic cylinder control valve, the solenoid valve includes: a solenoid valve assembly, having a first main interface communicating with the working connection port and a second main interface communicating with the hydraulic cylinder connection port; and the solenoid valve assembly having a main valve hole arranged axially therein, with both the first main interface and the second main interface communicating with the main valve hole; a main valve core, slidably disposed within the main valve hole along the axial direction of the main valve hole, for pressing against and sealing the first main interface to cut off the communication between the first main interface and the main valve hole, thereby cutting off the communication between the first main interface and the second main interface; the main valve core having a pilot valve hole extending axially therein and communicating with the main valve hole, a first connecting hole communicating with the first main interface, and a second connecting hole communicating with the second main interface, with both the first connecting hole and the second connecting hole communicating with the pilot valve hole; When the oil pressure at the first main interface is greater than that at the second main interface, the main valve core can move under the action of the oil pressure and open the first main interface, thus connecting the first and second main interfaces. The pilot valve core is slidably disposed in the pilot valve hole and is connected to an electromagnetic drive assembly for action in response to an electrical signal, thereby driving the pilot valve core to move against or away from the end of the main valve core, thus opening or closing the first connection hole accordingly. When the pilot valve core opens the first connection hole, the oil in the pilot valve hole flows through the first connection hole to the first main interface for depressurization, allowing the main valve core to move under the action of the high-pressure oil at the second main interface and open the first main interface, thus connecting the first and second main interfaces.

[0012] Furthermore, in the aforementioned hydraulic cylinder control valve, the main valve core is provided with an axial hydraulic force-applying structure, which is used to position the axial hydraulic force-applying structure at the second main interface when the main valve core is pressed against the first main interface, so that the hydraulic pressure at the second main interface can apply a force away from the first main interface to the main valve core along the axial direction of the main valve core.

[0013] Furthermore, in the aforementioned hydraulic cylinder control valve, a primary elastic element is provided on the side of the pilot valve core facing away from the main valve core, which is used to provide elastic force for the pilot valve core and the main valve core to reset; a secondary elastic element is provided between the main valve core and the pilot valve core, which is used to provide elastic buffer when the pilot valve core resets towards the main valve core, so as to absorb the impact kinetic energy of the pilot valve core, thereby limiting the impact force of the main valve core on the solenoid valve assembly.

[0014] The hydraulic cylinder control valve provided by this invention completely separates the emergency manual mechanism from the solenoid valve in terms of physical structure, and independently sets it on one side of the solenoid valve along its radial direction, forming a parallel layout instead of the traditional embedded through-type structure. This completely avoids the interference or damage of the internal oil circuit of the solenoid valve by the emergency manual mechanism, significantly simplifies the internal oil circuit structure of the control valve body, and reduces the difficulty of processing and manufacturing costs. At the same time, it eliminates the potential leakage channels and jamming risks caused by the through-part, which can effectively improve the sealing reliability and operation stability of the solenoid valve, thereby improving the overall reliability of the hydraulic cylinder control valve and ensuring the smoothness of platform descent and control accuracy.

[0015] On the other hand, the present invention proposes a scissor lift aerial work platform, which is equipped with the aforementioned hydraulic cylinder control valve.

[0016] Furthermore, the aforementioned scissor lift aerial work platform further includes: a lifting valve equipped with a lifting port, an oil inlet, and a return port. The lifting port is connected to the working connection port of the cylinder control valve. The lifting valve connects the lifting port to the oil inlet or the return port, so that when the lifting port is connected to the oil inlet, the hydraulic oil introduced through the oil inlet flows sequentially through the lifting port, the working connection port, and the cylinder connection port into the lifting working oil chamber to achieve the lifting action; and when the return port is connected to the lifting port, and the cylinder control valve manually or electromagnetically controls the working connection port and the cylinder connection port, the hydraulic oil in the lifting working oil chamber flows sequentially through the cylinder connection port, the working connection port, the lifting port, and the return port into the return oil tank to achieve the lowering action.

[0017] Because the hydraulic cylinder control valve has the aforementioned effects, the scissor lift aerial work platform and hydraulic control system equipped with the hydraulic cylinder control valve also have the corresponding technical effects. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of the hydraulic cylinder control valve provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the solenoid valve in its normal operating state, provided in an embodiment of the present invention. Figure 3 A schematic diagram of the structure of the solenoid valve when the working oil pressure at the first main interface increases and is greater than the oil pressure at the second main interface, according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the solenoid valve core when the first connection hole is opened, according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of the solenoid valve when the pilot valve core opens the first connection hole and the main valve core opens the first main interface after the solenoid valve core in the embodiment of the present invention opens the first main interface; Figure 6 This is a schematic diagram of the emergency manual mechanism under normal operating conditions provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the emergency manual mechanism in the activated state according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1-Control valve body, 2-Solenoid valve, 21-Solenoid valve assembly, 211-Main valve seat, 2111-First main interface, 2112-Second main interface, 2113-Main valve hole, 2114-Third main interface, 212-Guide sleeve, 2121-Main valve sleeve external thread, 213-Magnetic tube, 214-Magnetic sleeve, 215-Limit nut, 22-Main valve core, 221-First connecting hole, 222-Second connecting hole, 223-Pilot valve hole, 23-Pilot valve core, 231-Connecting groove, 24-Electromagnetic drive assembly, 241-Armature 242-Coil, 25-Main elastic element, 26-Secondary elastic element, 3-Emergency manual mechanism, 31-Emergency valve assembly, 311-Emergency valve seat, 3111-First emergency interface, 3112-Second emergency interface, 3113-Emergency valve hole, 312-Emergency valve sleeve, 3121-External thread of emergency valve sleeve, 32-Emergency valve core, 321-Emergency connecting groove, 322-Slot, 33-Emergency pull rod, 331-Protruding connecting block, 34-Hand pull piece, 35-Rotating connector, 36-Emergency elastic element, 37-Pressure adjusting pad. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example of hydraulic cylinder control valve: See Figure 1 This is a schematic diagram of the structure of the hydraulic cylinder control valve provided in an embodiment of the present invention. As shown in the figure, the hydraulic cylinder control valve includes: a control valve body 1, a solenoid valve 2, and an emergency manual mechanism 3; wherein, The control valve body 1 is provided with a working connection port (not shown in the figure) and a cylinder connection port (not shown in the figure).

[0021] Specifically, the control valve body 1, serving as the base of the entire valve, can be a cuboid structure with two blind mounting holes arranged side-by-side to install the solenoid valve 2 and the emergency manual mechanism 3, respectively. The control valve body 1 may have a working connection port and a cylinder connection port. Preferably, the working connection port and the cylinder connection port are located on different side walls of the control valve body 1 to facilitate the connection of corresponding connectors. In this embodiment, the cylinder control valve is suitable for the hydraulic control system of a scissor lift aerial work platform. The working connection port can communicate with the lifting working port of the lifting valve, connecting the inlet or outlet oil port through the lifting valve. The cylinder connection port can communicate with the lifting working oil chamber of the scissor lift aerial work platform, thereby cooperating with the lifting valve and the solenoid valve 2 and emergency manual mechanism 3 on the control valve body 1 to realize the oil inlet and outlet of the lifting working oil chamber, thus achieving the lifting and lowering of the scissor lift aerial work platform.

[0022] Solenoid valve 2 is installed on the control valve body 1 and is used to respond to an electrical signal to control the oil circuit between the working connection port and the cylinder connection port on the control valve body 1.

[0023] Specifically, the solenoid valve 2 can receive external electrical signals, respond to the signals, and generate corresponding electromagnetic actions to control the oil circuit between the working connection port and the cylinder connection port on the control valve body 1, thereby controlling the return oil in the lifting working oil chamber and thus controlling the descent of the scissor lift aerial work platform.

[0024] In this embodiment, when the platform needs to be lifted, the lifting valve controls the connection between the working port and the oil inlet. At this time, the oil pressure at the working port is greater than the oil pressure at the cylinder connection port. The valve core inside the solenoid valve 2 can move automatically under the action of the pressure difference between the oil on both sides, connecting the working port and the cylinder connection port, so that the hydraulic oil in the oil inlet enters the lifting working oil chamber, thereby realizing the lifting of the scissor lift aerial work platform.

[0025] When the platform is to descend, the lifting valve connects the working connection port to the return port. At this time, the oil pressure at the working connection port is lower than the oil pressure at the cylinder connection port. The external control circuit energizes solenoid valve 2, causing it to activate electromagnetically in response to the electrical signal. This drives the valve core inside solenoid valve 2 to move, thereby connecting the working connection port and the cylinder connection port. This allows the hydraulic oil in the lifting working oil chamber to flow out through the return port, thus lowering the scissor lift aerial work platform. When the external control circuit loses power, the valve core inside solenoid valve 2 resets, cutting off the connection between the working connection port and the cylinder connection port, and the platform stops descending.

[0026] The emergency manual mechanism 3 is connected in parallel with the solenoid valve 2 and is independently installed on one side of the solenoid valve 2 along the radial direction of the solenoid valve 2. It is used to manually control the oil circuit between the working connection port and the oil cylinder connection port when the solenoid valve 2 fails, so that the oil at the oil cylinder connection port can flow out from the working connection port.

[0027] Specifically, the emergency manual mechanism 3 and the solenoid valve 2 are connected in parallel and radially independent, so that the emergency manual mechanism 3 and the solenoid valve 2 are parallel in terms of oil circuit control, but do not interfere with each other physically. When the solenoid valve 2 fails to work properly due to a fault such as power failure or electrical malfunction, the operator can manually operate the emergency manual mechanism 3 to manually control the oil circuit between the working connection port and the cylinder connection port, ensuring that the oil at the cylinder connection port can flow out from the working connection port, thereby realizing the manual emergency unloading or control function, and thus realizing the manual control descent of the scissor lift aerial work platform.

[0028] Therefore, by completely separating the emergency manual mechanism 3 from the solenoid valve 2 in terms of physical structure and independently setting it on one side of the solenoid valve 2 along its radial direction, forming a parallel layout instead of the traditional embedded through-type structure, the interference or damage of the emergency manual mechanism 3 to the internal oil circuit of the solenoid valve 2 is completely avoided. This significantly simplifies the internal oil circuit structure of the control valve body 1, reduces the processing difficulty and manufacturing cost. At the same time, it eliminates the potential leakage channels and jamming risks caused by the through-part, which can effectively improve the sealing reliability and operation stability of the solenoid valve 2, thereby improving the overall reliability of the cylinder control valve, ensuring the smoothness of the platform descent and the control accuracy, and solving the problem of low reliability of the solenoid valve caused by the emergency button mechanism penetrating the solenoid valve control valve body 1 in existing solenoid valves.

[0029] See Figures 2 to 5 The figure illustrates a preferred structure of the solenoid valve 2 provided in an embodiment of the present invention. As shown, the solenoid valve 2 includes: a solenoid valve assembly 21, a main valve core 22, a pilot valve core 23, and an electromagnetic drive assembly 24; wherein, The solenoid valve assembly 21 is provided with a first main interface 2111 that communicates with the working connection port and a second main interface 2112 that communicates with the oil cylinder connection port. Furthermore, the solenoid valve assembly 21 is provided with a main valve hole 2113 arranged along its axial direction. Both the first main interface 2111 and the second main interface 2112 are connected to the main valve hole 2113.

[0030] Specifically, the solenoid valve assembly 21 serves as the mounting base for the solenoid valve 2 and can be integrally mounted on the control valve body 1 via a threaded connection. In this embodiment, the solenoid valve assembly 21 has a main valve hole 2113 extending axially inside, which serves as a receiving cavity for accommodating the pilot valve core 23. One axial end of the main valve hole 2113 (e.g., Figure 2 The left end (shown) may be provided with a first main interface 2111, which is coaxially arranged with the solenoid valve assembly 21. A second main interface 2112 is opened on the side wall of the solenoid valve assembly 21. Both the first main interface 2111 and the second main interface 2112 are connected to the main valve hole 2113, thereby forming a basic oil flow channel inside the solenoid valve assembly 21. The first main interface 2111 is connected to the working connection port for introducing or discharging pressurized oil, and the second main interface 2112 is connected to the cylinder connection port for supplying oil to the cylinder, especially the lifting working oil chamber, or receiving oil return from the lifting working oil chamber. In this embodiment, a third main interface 2114 may also be opened on the side wall of the solenoid valve assembly 21. The third main interface 2114 is connected to the second main interface 2112, realizing the series arrangement of the second main interface 2112 and the second emergency interface 3112 on the emergency manual mechanism 3. Of course, it can also be arranged in parallel in other ways, that is, connected to the cylinder connection port respectively. In this embodiment, the series arrangement can simplify the internal structure of the control valve body 1. The third main interface 2114 and the second main interface 2112 can be connected through the main valve hole 2113 or through other structures. Furthermore, the third main interface 2114 is connected to the second emergency interface 3112 of the emergency manual mechanism 3, forming two parallel connection ports connected by the cylinder connection port.

[0031] The main valve core 22 is slidably disposed within the main valve hole 2113 along the axial direction of the main valve hole 2113, and is used to press against and seal the first main interface 2111 to cut off the communication between the first main interface 2111 and the main valve hole 2113, thereby cutting off the communication between the first main interface 2111 and the second main interface 2112; the main valve core 22 is provided with a pilot valve hole 223 extending along its axial direction and communicating with the main valve hole 2113, a first connecting hole 221 communicating with the first main interface 2111, and a second connecting hole 222 communicating with the second main interface 2112. The first connecting hole 221 and the second connecting hole 222 are both communicating with the pilot valve hole 223; when the oil pressure of the first main interface 2111 is greater than the oil pressure of the second main interface 2112, the main valve core 22 can move under the action of oil pressure and open the first main interface 2111, so that the first main interface 2111 and the second main interface 2112 are connected.

[0032] Specifically, the main valve core 22 is a hollow slide valve structure, whose outer wall slides and seals against the inner wall of the main valve hole 2113; in normal operation, i.e., in the free state, that is, the initial position, the end of the main valve core 22 (e.g., Figure 2 The left end (as shown) is pressed against the port of the first main interface 2111 under the action of spring force or other restoring force, as... Figure 2 As shown, a sealed and cut-off state is formed. In this embodiment, the pilot valve hole 223 on the main valve core 22 extends axially and can be a blind hole to accommodate and guide the sliding of the pilot valve core 23. The first connecting hole 221 is located at the left end of the main valve core 22, i.e., the end near the first main interface 2111, and it is always in communication with the first main interface 2111. When the main valve core 22 is in the initial position of blocking the first main interface 2111, the left end of the main valve core 22 is in direct contact with the first main interface 2111 at the left end of the solenoid valve assembly 21, forming an end face seal. At the same time, the first connecting hole 221 enables communication between the pilot valve hole 223 and the first main interface 2111. The second connecting hole 222 penetrates the side wall of the main valve core 22, i.e., it is located at the circumferential position of the side wall of the main valve core 22, and the second main interface 2112 is always in communication. Both the first connecting hole 221 and the second connecting hole 222 are connected to the pilot valve hole 223, forming a complete oil passage network inside the main valve core 22: the high-pressure oil from the second main interface 2112 side can enter the pilot valve hole 223 and the main valve hole 2113 through the second connecting hole 222, and act on one end of the main valve core 22 (e.g., Figure 2(As shown on the right end). The diameter of the first connecting hole 221 is larger than that of the second connecting hole 222. The oil pressure at the working connection port is less than that at the cylinder connection port. When the pilot valve core 23 opens the first connecting hole 221, the main valve hole 2113 and the pilot valve hole 223 can release pressure through the first connecting hole 221, so that the main valve core 22 can move away from the first main interface 2111 under the oil pressure of the second main interface 2112, so as to disengage from and open the first main interface 2111, so that the first main interface 2111 and the second main interface 2112 are connected.

[0033] When oil is needed for lifting operations, the working connection port connects to the oil inlet port, causing the working oil pressure at the first main interface 2111 to rise and exceed the oil pressure at the second main interface 2112. This pressure difference acts on the end face of the main valve core 22, driving the main valve core 22 to slide along the main valve hole 2113 (e.g., Figure 3 (As shown, it moves to the right) and drives the pilot valve core 23 to move to the right simultaneously, disengaging and opening the first main interface 2111, so that the first main interface 2111 is connected to the main valve hole 2113, realizing the connection between the first main interface 2111 and the second main interface 2112, so that the hydraulic oil at the first main interface 2111 flows through the main valve hole 2113 and the second connecting hole 222 to the second main interface 2112, thereby realizing the oil inlet passage. Among them, Figure 3 The red arrows in the diagram indicate the direction of hydraulic oil flow.

[0034] When the descent condition requires oil return, the oil pressure at the second main interface 2112 is greater than the oil pressure at the first main interface 2111. High-pressure oil enters the pilot valve port 223 and the main valve port 2113 through the second connecting hole 222. In particular, the wall oil pressure on the right side of the main valve core 22 increases and acts on the main valve core 22, ensuring that the main valve core 22 remains at a certain position under the action of the high-pressure oil. Figure 2 The sealing position is shown; in such a position Figure 4 After the pilot valve core 23 opens the first connection hole 221, the oil in the pilot valve hole 223 and the main valve hole 2113 flows out from the first connection hole 221 to the return oil tank, which reduces the pressure in the main valve hole 2113. This allows the main valve core 22 to move under the oil pressure of the second main interface 2112 (e.g., ...). Figure 2 (As shown, move to the right) and open the first main interface 2111. Among them, Figure 4 The red arrow in the middle indicates the direction of oil flow in the main valve port 2113, and the blue arrow indicates the direction of the thrust of the oil pressure at the second main port 2112.

[0035] The pilot valve core 23 is slidably disposed within the pilot valve hole 223, and is connected to an electromagnetic drive assembly 24 for operation in response to an electrical signal, thereby driving the pilot valve core 23 to move against or away from the end of the main valve core 22, so that the pilot valve core 23 opens or closes the first connection hole 221 accordingly; when the pilot valve core 23 opens the first connection hole 221, the oil in the pilot valve hole 223 flows through the first connection hole 221 to the first main interface 2111 for depressurization, so that the main valve core 22 can move under the action of the high-pressure oil at the second main interface 2112 and open the first main interface 2111, realizing the connection between the first main interface 2111 and the second main interface 2112.

[0036] Specifically, the pilot valve core 23, as a pilot stage control element, slides in the same direction as the main valve core 22. The pilot valve core 23 is connected to the power output end of the electromagnetic drive assembly 24 so as to be driven by the electromagnetic drive assembly 24 to open the first connection hole 221.

[0037] In this embodiment, a main elastic element 25 is provided on the side of the pilot valve core 23 facing away from the main valve core 22, which is used to provide elastic force for the pilot valve core 23 and the main valve core 22 to reset.

[0038] Specifically, the main elastic element 25 is located on the right side of the pilot valve core 23 and is in a pre-compressed state. This main elastic element 25 can indirectly act on the main valve core 22 through the pilot valve core 23. Especially when the electromagnetic drive assembly 24 is de-energized, the electromagnetic drive force disappears, the pre-compression force of the main elastic element 25 is released, providing the reset force required for the pilot valve core 23 to reset, pushing the pilot valve core 23 to move to the left to reset until the pilot valve core 23 re-abuts and seals the first connection hole 221, and maintains the closed position of abutting and sealing the first connection hole 221, cutting off the pressure relief passage in the main valve hole 2113; at the same time, after the pilot valve core 23 is reset, the left end of the pilot valve core 23 abuts against the left end of the main valve core 22, and the elastic force of the main elastic element 25 is transmitted to the main valve core 22 through the pilot valve core 23, pushing the main valve core 22 to move to the left and maintaining the closed state of pressing and sealing the first main interface 2111, completing the entire reset process. In other words, under normal conditions, the main elastic element 25 simultaneously maintains both the pilot valve core 23 and the main valve core 22 in the closed position. Through the main elastic element 25, not only is an independent reset force provided to the pilot valve core 23, but it also indirectly provides an auxiliary reset force to the main valve core 22, ensuring that the pilot valve core 23 and the main valve core 22 can reliably reset in the event of power failure, cutting off the oil circuit and improving the control reliability and safety of the solenoid valve 2. Of course, in other embodiments, reset can also be achieved through other reset elements, such as another electromagnetic drive assembly 24, to apply a reverse electromagnetic drive force, thereby resetting the pilot valve core 23 and the main valve core 22.

[0039] When the descent condition requires oil return, the electromagnetic drive assembly 24 receives an external electrical signal and is energized, generating an electromagnetic driving force to drive the pilot valve core 23 in a direction away from the end of the main valve core 22 (e.g., ...). Figure 4 Move to the right (as shown), as Figure 4 As shown, the pilot valve core 23 opens the first connecting hole 221, connecting the pilot valve hole 223 to the first connecting hole 221. Since the first connecting hole 221 is connected to the first main interface 2111, and the first main interface 2111 side is the low-pressure return oil side, the pressurized oil in the pilot valve hole 223 and the back pressure chamber on the right side of the main valve hole 2113 flows through the first connecting hole 221 to the first main interface 2111 side for pressure relief, and the pressure on the right side of the main valve hole 2113 decreases. At this time, the main valve core 22 slides to the right under the action of the high-pressure oil on the second main interface 2112 side, as... Figure 5 As shown, the first main interface 2111 is turned on, so that the second main interface 2112 is directly connected to the first main interface 2111 to realize the oil return path.

[0040] When the electromagnetic drive assembly 24 loses power, the electromagnetic force disappears, and the pilot valve core 23, under the action of the main elastic element 25, moves towards the end of the main valve core 22 (e.g., Figure 5 (As shown, move to the left) until it abuts and seals the first connecting hole 221, cutting off the pressure relief passage. At the same time, after the pilot valve core 23 is reset, the left end of the pilot valve core 23 abuts against the left end of the main valve core 22. The elastic force of the main elastic element 25 is transmitted to the main valve core 22 through the pilot valve core 23, pushing the main valve core 22 to move to the left and maintaining the closed state of abutting and sealing the first main interface 2111, cutting off the oil circuit and completing the entire reset process.

[0041] In this embodiment, a secondary elastic element 26 is provided between the main valve core 22 and the pilot valve core 23 to provide elastic buffer when the pilot valve core 23 resets toward the main valve core 22, so as to absorb the impact kinetic energy of the pilot valve core 23 and thereby limit the impact force, i.e. the closing force, of the main valve core 22 on the solenoid valve assembly 21.

[0042] Specifically, the secondary elastic element 26 can be located between the left support end of the main valve core 22 and the left support end of the pilot valve core 23, and is in a pre-compressed state. Here, "closing force" refers to the force applied by the valve core when it is in the closed position, relying on medium pressure, spring force, or other external forces to maintain a sealed or fully closed state. It is a relatively static force emphasizing the "keeping closed" or "finally pressing" state. In this embodiment, the secondary elastic element 26 is provided to dynamically optimize this impact force. When the descent condition ends and the electromagnetic drive assembly 24 is de-energized, the main elastic element 25 pushes the pilot valve core 23 to quickly reset to the left. At the instant the pilot valve core 23 moves to the left and contacts the main valve core 22, the secondary elastic element 26 provides a flexible buffer between them, absorbing the impact kinetic energy generated when the pilot valve core 23 resets, slowing down the impact speed of the pilot valve core 23, thereby avoiding a rigid impact between the pilot valve core 23 and the main valve core 22. Because the rigid impact between the pilot valve core 23 and the main valve core 22 is eliminated, the impact force transmitted to the main valve core 22 is effectively weakened, thereby preventing the main valve core 22 from violently impacting the solenoid valve assembly 21, i.e., the first main interface 2111, with excessive speed or force due to severe impact. In other words, the secondary elastic element 26 indirectly limits the magnitude of the static impact force of the main valve core 22 on the solenoid valve assembly 21 through buffering, keeping it within the design range and avoiding damage to the valve port sealing surface or impact noise caused by excessive impact. The secondary elastic element 26 not only protects the contact surface between the pilot valve core 23 and the main valve core 22, but also ensures a smooth and gentle closing action between the main valve core 22 and the valve seat of the solenoid valve assembly 21, improving the valve's sealing life, operational reliability, and operational stability.

[0043] See also Figure 2 The solenoid valve assembly 21 may include a main valve seat 211, a guide sleeve 212, a magnetic tube 213, and a magnetic sleeve 214. The main valve seat 211 serves as the base of the solenoid valve assembly 21 and is provided with a first main interface 2111, a second main interface 2112, a third main interface 2114, and a main valve hole 2113. The main valve hole 2113 extends axially through or is formed inside the main valve seat 211. The first main interface 2111, the second main interface 2112, and the third main interface 2114 are respectively connected to the main valve hole 2113 for connecting different oil passages. The guide sleeve 212 is located on one side of the main valve seat 211 (e.g., ...). Figure 2 (As shown on the right), used to mount the solenoid valve assembly 21 onto the control valve body 1. In a preferred embodiment, the guide sleeve 212 has a main valve sleeve external thread 2121 on its outer periphery. Correspondingly, the inner wall of the mounting hole in the control valve body 1 has an internal thread. The guide sleeve 212 is connected to the control valve body 1 via the mating thread between the main valve sleeve external thread 2121 and the internal thread of the mounting hole. When the guide sleeve 212 is tightened to a predetermined position, its end abuts against the corresponding end face of the main valve seat 211 (e.g., ...). Figure 2The right end face shown in the diagram limits and fixes the main valve seat 211 within the mounting hole of the control valve body 1, thus achieving reliable assembly of the solenoid valve assembly 21 and the control valve body 1. The magnetic sleeve 214 is located on the other side of the guide sleeve 212, i.e., the side away from the main valve seat 211 (e.g., the side away from the main valve seat 211). Figure 2 (As shown on the right), and coaxially arranged with the guide sleeve 212. The magnetic sleeve 214 is sleeved on the outer periphery of the armature 241 of the electromagnetic drive assembly 24, and its inner wall slides in fit with the outer peripheral surface of the armature 241. It is used to guide and support the axial movement of the armature 241, ensuring that the armature 241 can slide smoothly under the action of electromagnetic force. At the same time, the outer periphery of the magnetic sleeve 214 is used to support the coil 242. That is, the coil 242 is wound and installed on the outside of the magnetic sleeve 214, and the magnetic sleeve 214 provides radial support and positioning for the coil 242. The magnetic tube 213 is arranged on the other side of the magnetic sleeve 214, that is, on the side away from the guide sleeve 212 (e.g., the side away from the guide sleeve 212). Figure 2 (As shown on the right), and connected to the guide sleeve 212 via the magnetic sleeve 214. The two ends of the magnetic sleeve 214 are fixedly connected to the guide sleeve 212 and the magnetic tube 213 respectively. By welding, the guide sleeve 212, magnetic sleeve 214, and magnetic tube 213 can form a continuous sleeve structure, together constituting the housing or frame of the electromagnetic drive assembly 24. The magnetic tube 213 can axially limit the movement of the armature 241. At the end of the magnetic sleeve 214, i.e., on the side near the magnetic tube 213 or on the side away from the guide sleeve 212 (e.g., on the right side),... Figure 2 A limiting nut 215 is provided at the right end (as shown). The limiting nut 215 is sleeved and fixed to the outer circumference of the magnetic tube 213 to limit the axial movement of the coil 242. After the coil 242 is sleeved on the outer circumference of the magnetic sleeve 214 and the magnetic tube 213, the limiting nut 215 abuts against the end face of the coil 242, and the other end face of the coil 242 is limited by the guide sleeve 212 to prevent the coil 242 from moving axially and to ensure that the coil 242 maintains a stable position during operation.

[0044] Through the above structural design, the solenoid valve assembly 21 integrates functions such as valve body installation, valve core guidance, armature 241 support, and coil 242 positioning into one unit. It has a compact structure, is easy to assemble, and ensures the coaxiality and fitting accuracy of each moving part, thereby improving the working reliability and stability of the solenoid valve 2.

[0045] See also Figure 2 The main valve core 22 is provided with an axial hydraulic force application structure, which is located at the second main interface 2112 when the main valve core 22 is pressed against the first main interface 2111, so that the hydraulic pressure of the second main interface 2112 can apply a force away from the first main interface 2111 to the main valve core 22 along the axial direction of the main valve core 22.

[0046] Specifically, the hydraulic axial force application structure converts the hydraulic pressure at the second main interface 2112 into axial driving force. When the main valve core 22 is in the closed state, i.e., when its left end is pressing against and sealing the first main interface 2111, the hydraulic axial force application structure is precisely located at the axial position corresponding to the second main interface 2112. At this time, high-pressure hydraulic fluid from the cylinder connection port side enters the main valve hole 2113 through the second main interface 2112, acting on the hydraulic axial force application structure to generate a rightward axial component force, such as... Figure 4 The blue arrows shown indicate a direction away from the first main interface 2111. In this embodiment, the first main interface 2111 is located to the left of the main valve core 22. This force pushes the main valve core 22 to the right, tending to open it. The oil pressure at the second main interface 2112 can pre-apply an opening force when the main valve core 22 is in the closed state, providing power for opening the main valve core 22.

[0047] Preferably, the hydraulic axial force application structure is a stepped structure provided on the outer wall of the main valve core 22. Specifically, the outer wall of the main valve core 22 has a diameter variation along the axial direction, forming a stepped structure, which can be provided at the end of the main valve core 22 where the first connecting hole 221 is provided. This stepped structure has a side-facing orientation (e.g., Figure 4 The radial force-applying surface (shown on the left) is perpendicular to the axial direction of the main valve core 22. When the high-pressure oil from the second main interface 2112 enters the main valve hole 2113, the oil pressure acts on the radial force-applying surface of this stepped structure. According to Pascal's principle, the oil pressure generates a pressure perpendicular to this surface, and its axial component serves as the driving force propelling the main valve core 22 to the right. Simultaneously, this stepped structure also forms an annular cavity between the outer wall of the main valve core 22 and the inner wall of the main valve hole 2113. Because the outer diameter of the main valve core 22 changes at the step, an annular gap space is formed between the smaller diameter section of the stepped structure and the inner wall of the main valve hole 2113. This annular cavity is connected to the second main interface 2112, serving as a channel for oil to enter and act on the force-applying surface. Furthermore, this annular cavity can also be used to connect the second main interface 2112 and the third main interface 2114, allowing oil to flow between different interfaces through the annular cavity, simplifying the oil circuit design. By adopting a stepped structure as the hydraulic axial force application structure, not only is the function of converting circumferential hydraulic pressure into axial driving force realized, but also an annular oil cavity is formed at the same time. It is multi-functional, compact in structure, easy to process, and highly reliable.

[0048] In this embodiment, the pilot valve core 23 may include a first shaft segment and a second shaft segment arranged coaxially, wherein the diameter of the first shaft segment is smaller than the diameter of the second shaft segment.

[0049] Specifically, the first shaft segment is located at the end of the pilot valve core 23 facing the main valve core 22, and its end is provided with a sealing cone structure, which is used to cooperate with the orifice of the first connecting hole 221 to form a conical seal or a line seal, so as to improve the sealing effect. As a preferred embodiment, the sealing cone structure is a conical structure, and its conical surface forms a line contact or surface contact seal with the conical surface or sharp edge of the orifice of the first connecting hole 221.

[0050] In this embodiment, an annular gap is formed between the outer peripheral surface of the first shaft segment and the inner wall of the pilot valve hole 223 of the main valve core 22. This gap constitutes the mounting space for the secondary elastic element 26, i.e., the secondary spring cavity. The secondary elastic element 26 is sleeved on the outer periphery of the first shaft segment, one end of which (e.g., Figure 2 The left end shown abuts against the main valve core 22, and the other end (as shown on the left end) abuts against the main valve core 22, and the other end (as shown on the right end) abuts against the main valve core 22. Figure 2 The right end shown abuts against the end face of the second shaft section of the pilot valve core 23 (as shown). Figure 2 As shown on the left end face, the secondary elastic element 26 is radially limited and guided by the first shaft segment to ensure that the secondary elastic element 26 maintains stable axial expansion and contraction during compression and reset.

[0051] In this embodiment, the diameter of the second shaft segment is adapted to the diameter of the pilot valve hole 223, and the outer peripheral surface of the second shaft segment slides in conjunction with the inner wall of the pilot valve hole 223 to guide and support the axial movement of the pilot valve core 23. The second shaft segment is provided with at least one through-hole 231 extending along its axial direction to connect the pilot valve hole 223 and the main valve hole 2113, namely the secondary spring cavity located on the side of the first shaft segment and the back pressure cavity located on the right side of the main valve core 22. The through-hole 231 keeps the secondary spring cavity and the back pressure cavity in constant communication, thereby connecting the back pressure cavity to the first connecting hole 221 through the through-hole 231 and the secondary spring cavity. When the pilot valve core 23 moves to open the first connecting hole 221, the oil in the back pressure cavity can flow through the through-hole 231, the secondary spring cavity, and the first connecting hole 221 to the first main interface 2111 for pressure relief.

[0052] See also Figure 2 The electromagnetic drive assembly 24 includes an armature 241 and a coil 242. The armature 241 is disposed on one side of the pilot valve core 23 and connected to the pilot valve core 23. The coil 242 is sleeved on the outer periphery of the armature 241 and is used to be energized in response to an electrical signal to generate an electromagnetic force to drive the armature 241 to move the pilot valve core 23 away from the main valve core 22, thereby opening the first connection hole 221.

[0053] Specifically, the armature 241 is disposed on one side of the pilot valve core 23 (e.g., Figure 2(As shown on the right side), and connected to the pilot valve core 23. In a preferred embodiment, the left end of the armature 241 is fixedly connected to the right end of the pilot valve core 23, so that the two can move axially synchronously. The armature 241 is slidably disposed inside the magnetic sleeve 214, and its outer peripheral surface slides against the inner wall of the magnetic sleeve 214, so that the magnetic sleeve 214 guides and supports the movement of the armature 241. The coil 242 is sleeved on the outer periphery of the armature 241, specifically wound and installed outside the magnetic sleeve 214 and the magnetic tube 213. The coil 242 is used to excite in response to an external electrical signal: when the external control circuit energizes the coil 242, an electromagnetic field is generated around the coil 242, which acts on the armature 241, so that the armature 241 is subjected to an axial electromagnetic driving force. Under the drive of this electromagnetic force, the armature 241 drives the pilot valve core 23 connected to it to move away from the direction of the main valve core 22 (e.g., Figure 2 (As shown, it moves to the right). In this embodiment, the main elastic element 25 is disposed between the armature 241 and the magnetic tube 213. One end of the main elastic element 25 abuts against the left end face of the armature 241, and the other end abuts against the right end face of the magnetic tube 213, and is in a pre-compressed state.

[0054] When the pilot valve core 23 moves to the right, the sealing cone structure at the left end of the pilot valve core 23 gradually disengages from the opening of the first connecting hole 221, thereby opening the first connecting hole 221. After the first connecting hole 221 is opened, the oil in the back pressure chamber on the right side of the main valve core 22 can flow through the pilot valve hole 223 and the first connecting hole 221 to the first main interface 2111 side for pressure relief, creating conditions for the subsequent opening of the main valve core 22.

[0055] When the external control circuit is disconnected and the coil 242 loses its magnetism, the electromagnetic force disappears. At this time, the main elastic element 25, located between the right end of the armature 241 and the left end of the magnetic tube 213, releases the pre-compression force, pushing the armature 241 to move to the left to reset. The armature 241 drives the pilot valve core 23 to move to the left in sync, until the sealing cone structure at the left end of the pilot valve core 23 re-abuts and seals the first connecting hole 221, cutting off the pressure relief passage and restoring the electromagnetic drive assembly 24 and the entire valve core system to the initial closed state.

[0056] In other embodiments, the solenoid valve 2 may also have other structures.

[0057] See Figures 6 to 7 The figure shows a schematic diagram of the emergency manual mechanism 3 provided in an embodiment of the present invention. As shown, the emergency manual mechanism 3 includes: an emergency valve assembly 31, an emergency valve core 32, and an emergency pull rod 33; wherein, The emergency valve assembly 31 is provided with a first emergency interface 3111 that communicates with the working connection port and a second emergency interface 3112 that communicates with the oil cylinder connection port. Furthermore, the emergency valve assembly 31 is provided with an emergency valve hole 3113 arranged along its axial direction. Both the first emergency interface 3111 and the second emergency interface 3112 are connected to the emergency valve hole 3113.

[0058] Specifically, the emergency valve assembly 31 serves as the mounting base for the emergency manual mechanism 3, and its interior has an axially extending emergency valve hole 3113 for accommodating components such as the emergency valve core 32. A first emergency interface 3111 is located at the end of the emergency valve assembly 31 (e.g., ...). Figure 6 (As shown on the left end), in particular, the first emergency interface 3111 is located at the axial end of the emergency valve assembly 31 and is coaxially arranged with the emergency valve hole 3113. The second emergency interface 3112 is opened on the side wall of the emergency valve assembly 31 and is connected to the emergency valve hole 3113. Among them, the first emergency interface 3111 is connected to the working connection port on the control valve body 1 through an oil circuit, and is used to introduce or discharge oil in emergency conditions; the second emergency interface 3112 is connected to the cylinder connection port on the control valve body 1 through an oil circuit, and is used to receive cylinder return oil in emergency conditions; in this embodiment, the second emergency interface 3112 is connected to the third main interface 2114 on the main valve seat 211, and is also connected to the cylinder connection port on the control valve body 1 through the second main interface 2112. The emergency valve assembly 31 has an emergency oil circuit channel independent of the solenoid valve 2. When the solenoid valve 2 fails, the valve core in the emergency valve port 3113 can be controlled by operating the emergency manual mechanism 3, thereby controlling the on / off connection between the first emergency interface 3111 and the second emergency interface 3112. This bypasses the solenoid valve 2 and directly controls the oil circuit between the working connection port and the cylinder connection port. In particular, when the solenoid valve 2 fails, the return oil of the lifting working oil chamber can be directly controlled. The oil inlet of the lifting working oil chamber is achieved through the solenoid valve 2. Specifically, under the action of oil pressure, the main valve core 22, the pilot valve core 23 and the armature 241 can be pushed to open the first main interface 2111 to achieve connection, thereby realizing the oil inlet of the lifting working oil chamber.

[0059] The emergency valve core 32 is slidably disposed in the emergency valve hole 3113 along the axial direction of the emergency valve hole 3113, and is used to abut or move away from the first emergency interface 3111, so that the emergency valve core 32 opens or closes the first emergency interface 3111 accordingly, thereby connecting or disconnecting the first emergency port and the second emergency port accordingly.

[0060] Specifically, the emergency valve core 32 slides into the emergency valve hole 3113, and its outer wall seals against the inner wall of the emergency valve hole 3113, dividing the emergency valve hole 3113 into two cavities. Under normal conditions, i.e., non-emergency operation, the emergency valve core 32 remains pressed against the first emergency interface 3111 under the action of a restoring force, such as spring force, blocking the first emergency interface 3111 and cutting off the connection between the first emergency interface 3111 and the emergency valve hole 3113, thus disconnecting the first emergency interface 3111 from the second emergency interface 3112. When an emergency operation is required, external force drives the emergency valve core 32 to slide along the emergency valve hole 3113, moving it away from the first emergency interface 3111, opening the first emergency interface 3111 and connecting it to the emergency valve hole 3113. Since the second emergency interface 3112 is always connected to the emergency valve hole 3113, when the first emergency interface 3111 is opened, the first emergency interface 3111 is connected to the second emergency interface 3112 through the emergency valve hole 3113, thereby connecting the emergency oil circuit between the working connection port and the cylinder connection port. In this embodiment, the structure of the emergency valve core 32 can refer to the structure of the main valve core 22, for example, it contains two shaft sections. The emergency valve core 32, especially the large shaft section, is provided with an emergency connecting groove 321, which is connected to the cavities on both sides of the emergency valve core 32. When the emergency valve core 32 slides in the emergency valve hole 3113, the oil in the cavities on both sides can flow freely through the emergency connecting groove 321 to achieve pressure balance.

[0061] The emergency pull rod 33 is slidably mounted on the emergency valve assembly 31. The first end, located inside the emergency valve hole 3113, is connected to the emergency valve core 32. The second end, located outside the emergency valve hole 3113, serves as an operating end that receives manual operating force. It is used to pull the emergency valve core 32 to move it away from the first emergency interface 3111, thereby connecting the first emergency interface 3111 with the emergency valve hole 3113, and further connecting the first emergency interface 3111 with the second emergency interface 3112.

[0062] Specifically, the emergency pull rod 33 slidably penetrates the side wall or end cap of the emergency valve assembly 31 along the axial direction, with its first end being the inner end (e.g., Figure 6 The left end (as shown) extends into the emergency valve hole 3113 and is fixedly connected to or abuts against the emergency valve core 32; the second end, i.e., the outer end (as shown) Figure 6 The emergency lever 33 (as shown on the right) extends to the outside of the emergency valve assembly 31 and is equipped with a pull handle 34 for manual operation. The pull handle 34 can be a pull ring, handle, or button. Under normal operating conditions, the emergency lever 33 is in its initial position, and the emergency valve core 32 remains closed. When the solenoid valve 2 fails and manual emergency operation is required, the operator moves away from the emergency valve assembly 31 (e.g., towards the right end). Figure 7Pulling the second end of the emergency lever 33 (as shown by the blue arrow to the right) causes the emergency lever 33 to slide along the emergency valve core 32 through the emergency valve hole 3113, disengaging the emergency valve core 32 from the first emergency interface 3111 and opening the first emergency interface 3111. High-pressure oil from the cylinder connection port enters the emergency valve hole 3113 through the second emergency interface 3112. After the first emergency interface 3111 is opened, the high-pressure oil in the emergency valve hole 3113 flows into the working connection port through the first emergency interface 3111, enabling manual emergency unloading or control. When the emergency lever 33 is released, the emergency valve core 32 can automatically reset under manual or other force, re-sealing the first emergency interface 3111 and cutting off the emergency oil circuit. A sealing ring may be provided on the outer circumference of the emergency lever 33.

[0063] In this embodiment, a swivel connector 35 is provided between the pull handle 34 and the emergency pull rod 33. One end of the swivel connector 35 (e.g., Figure 6 The right end (as shown) is fixedly connected to the handle 34, which can be achieved by threading, welding, or integral molding. The other end (as shown) Figure 6 The left end (shown) is connected to the emergency pull rod 33 in a manner that allows rotation about the axis of the emergency pull rod 33, meaning there is rotational freedom between them. It can be connected to the emergency pull rod 33 via a snap ring. With this connection, when the operator pulls the pull member 34, the rotating connector 35 only transmits axial tension to the emergency pull rod 33, allowing the emergency pull rod 33 to rotate freely relative to the pull member 34. This avoids unexpected circumferential rotation or radial sway of the emergency pull rod 33 due to applied torque during operation, ensuring that the emergency pull rod 33 moves smoothly only along the axial direction. This guarantees the accuracy and reliability of the emergency valve core 32's operation and prevents jamming or poor sealing caused by rod misalignment.

[0064] See also Figure 6 and Figure 7 An emergency elastic element 36 is provided between the emergency valve core 32 and the emergency valve assembly 31 to apply elastic force to the emergency valve core 32 so that the emergency valve core 32 abuts against the first emergency interface 3111 in a free state, thereby closing the first emergency interface 3111 and cutting off the connection between the first emergency interface 3111 and the emergency valve hole 3113, and further cutting off the connection between the first emergency interface 3111 and the second emergency interface 3112.

[0065] Specifically, the emergency elastic element 36 is disposed between the emergency valve core 32 and the emergency valve assembly 31, especially on the side closer to the emergency pull rod 33, and can be sleeved on the outer periphery of the emergency pull rod 33. One end of the emergency elastic element 36 (e.g. Figure 6 The left end shown abuts against the end of the emergency valve core 32, and the other end (as shown) Figure 6 The right end shown abuts against the inner wall or end cap of the emergency valve assembly 31. Figure 6 (The right end cap shown). The emergency elastic element 36 is in a pre-compressed state, continuously applying pressure to the emergency valve core 32 in the direction toward the first emergency interface 3111 (e.g., Figure 6 The elastic force (shown to the left). In this embodiment, a pressure adjusting shim 37 may be provided between the emergency elastic element 36 and the emergency valve assembly 31 to adjust the preload of the emergency elastic element 36. In the free state, i.e., without external manual operation force, the preload of the emergency elastic element 36 pushes the emergency valve core 32, keeping it in contact with the first emergency interface 3111, forming a seal and cutting off the connection between the first emergency interface 3111 and the emergency valve hole 3113. Since the second emergency interface 3112 is always connected to the emergency valve hole 3113, the oil circuit between the first emergency interface 3111 and the second emergency interface 3112 is also cut off, ensuring that the emergency oil circuit is closed in non-emergency conditions, without affecting the normal automatic control of the solenoid valve 2.

[0066] In this embodiment, the preload of the emergency elastic element 36 after installation is greater than the preload of the main elastic element 25. When the oil pressure at the working connection port is greater than that at the cylinder connection port, i.e., when oil enters the lifting working oil chamber, the main valve core 22 moves to open the first main interface 2111, achieving connection, while the emergency valve core 32 remains closed. Furthermore, during normal operation of the solenoid valve 2, the main elastic element 25 applies a leftward reset force to the main valve core 22 through the armature 241 and the pilot valve core 23. This reset force may be indirectly transmitted to the oil circuit where the emergency valve core 32 is located through oil pressure fluctuations or mechanical vibrations. By setting the preload of the emergency elastic element 36 to be greater than that of the main elastic element 25, it can be ensured that under any operating condition, the closing force applied by the emergency elastic element 36 to the emergency valve core 32 is always sufficient to overcome possible external interference, keeping the emergency valve core 32 reliably closed and preventing accidental opening of the emergency oil circuit, thus ensuring the reliable closure of the emergency valve core 32. Furthermore, in non-emergency conditions, if the preload of the emergency elastic element 36 is insufficient, fluctuations or vibrations in the system oil pressure may cause slight displacement of the emergency valve core 32, leading to partial opening or leakage of the emergency oil circuit. By setting a larger preload, the risk of misoperation is avoided, ensuring that the emergency valve core 32 maintains a stable sealing state even under normal oil pressure fluctuations and mechanical vibrations, thus improving the safety and reliability of the system. Simultaneously, when manual emergency operation is required, the operator must overcome the preload of the emergency elastic element 36 to open the emergency valve core 32 by pulling the emergency lever 33. Due to the larger preload setting, the operator receives clear force feedback, clearly perceiving that the emergency valve core 32 has opened, avoiding misjudgments or incomplete operations due to insufficient operating force, thus ensuring the clarity of emergency operations. Under certain conditions, reverse high-pressure oil may act on the emergency valve core 32 at the working connection port or cylinder connection port. A larger preload can effectively resist the reverse oil pressure, preventing the emergency valve core 32 from being accidentally pushed open, ensuring that the emergency oil circuit can only be opened during manual operation, and preventing reverse opening due to oil pressure.

[0067] The emergency elastic element 36 not only enables the automatic reset and normally closed functions of the emergency valve core 32, but also ensures the reliability and safety of the emergency manual mechanism 3 under various working conditions through its preload matching design with the main elastic element 25, further improving the overall performance of the hydraulic cylinder control valve. Simultaneously, by connecting the emergency manual mechanism 3 in parallel with the solenoid valve 2 and arranging them independently along the radial direction, the operator only needs to overcome the preload of the emergency elastic element 36 to open the emergency valve core 32 when pulling the emergency lever 33, significantly reducing the operating force and making operation easier and more flexible. Since the emergency manual mechanism 3 does not need to penetrate the solenoid valve 2, its axial length is greatly shortened, resulting in a more compact structure. This effectively avoids the processing complexity and assembly difficulty associated with traditional through-type structures, significantly reducing manufacturing costs and fundamentally eliminating the risk of leakage and jamming caused by through-type components, thereby greatly improving the overall reliability and service life of the hydraulic cylinder control valve.

[0068] See also Figure 6 and Figure 7 The emergency valve assembly 31 includes an emergency valve seat 311 and an emergency valve sleeve 312; wherein, the emergency valve seat 311 is provided with a first emergency interface 3111 and a second emergency interface 3112; the emergency valve sleeve 312 is disposed on one side of the emergency valve seat 311 (e.g., Figure 6 As shown on the right side), it is connected to the control valve body 1 by a thread, and is used to limit the emergency valve seat 311 between the emergency valve sleeve 312 and the control valve body 1.

[0069] Specifically, the emergency valve seat 311 serves as the base of the emergency valve assembly 31, and is provided with a first emergency interface 3111 and a second emergency interface 3112. The emergency valve seat 311 contains an axially extending blind hole, which serves as an emergency valve hole 3113, with its opening facing the side of the emergency valve sleeve 312 (e.g., ...). Figure 6 (As shown in the right-hand arrangement), the closed end is located on the other side away from the emergency valve sleeve 312 (e.g.) Figure 6 (As shown on the left). The inner wall of the emergency valve hole 3113 slides and seals with the outer circumferential surface of the emergency valve core 32, ensuring that the emergency valve core 32 moves smoothly within the hole while preventing oil leakage from the fitting gap to the connection between the emergency valve seat 311 and the emergency valve sleeve 312. The first emergency interface 3111 is located at the axial position of the closed end of the emergency valve seat 311, that is, at the coaxial position on the left side of the emergency valve hole 3113, and is connected to the emergency valve hole 3113; the second emergency interface 3112 is provided through the side wall of the emergency valve seat 311 and is also connected to the emergency valve hole 3113. When the emergency valve core 32 moves to open the first emergency interface 3111, the oil on the second emergency interface 3112 side can flow out from the first emergency interface 3111 through the emergency valve hole 3113, thus achieving oil circuit connection. Simultaneously, because the emergency valve hole 3113 is a blind hole structure, the oil is confined inside the emergency valve hole 3113 and will not enter the connection area between the emergency valve seat 311 and the emergency valve sleeve 312, avoiding the risk of leakage. A sealing ring may be provided on the outer periphery of the emergency valve sleeve 312.

[0070] In this embodiment, the emergency valve sleeve 312 is disposed on one side of the emergency valve seat 311 (e.g., Figure 6(As shown on the right), it is used to install and fix the emergency valve seat 311 to the control valve body 1. The emergency valve sleeve 312 has a blind hole extending axially, which is used to accommodate part of the structure of the emergency valve core 32 and the emergency elastic element 36, providing space for the movement of the emergency valve core 32. The outer periphery of the emergency valve sleeve 312 has an external thread 3121, and the control valve body 1 has a matching internal thread mounting hole. The emergency valve sleeve 312 is fixed in the control valve body 1 by threaded connection. When the emergency valve sleeve 312 is tightened to the predetermined position, the limiting protrusion on its outer periphery presses against the corresponding end face of the emergency valve seat 311, thereby limiting the emergency valve seat 311 between the emergency valve sleeve 312 and the control valve body 1, realizing the reliable positioning and fixation of the emergency valve seat 311 in the control valve body 1.

[0071] Therefore, it can be seen that the emergency valve assembly 31 separates the oil circuit control function, namely the emergency valve seat 311, from the installation and fixing function, namely the emergency valve sleeve 312. This not only ensures the sealing reliability of the emergency oil circuit, but also simplifies the processing and assembly process, facilitates the installation of the internal structure, and reduces manufacturing costs.

[0072] In this embodiment, the first emergency interface 3111 is a damping port used to control the oil flow rate, thereby controlling the descent speed of the aerial work platform. Specifically, the first emergency interface 3111 can be a precision small hole structure axially located at the closed end of the emergency valve seat 311, with its diameter designed to match the target descent speed. Figure 7 As shown, when the emergency manual mechanism 3 is actuated, high-pressure oil from the cylinder connection port side enters the emergency valve port 3113 through the second emergency interface 3112, and then flows to the working connection port side through the first emergency interface 3111; wherein, Figure 7 The red arrow indicates the direction of oil flow, and the blue arrow indicates the pulling direction. During this process, the oil flow is restricted by the throttling effect when passing through the damping port, and the flow rate is precisely controlled within the design range, thereby achieving stable control of the platform's descent speed. Compared to the original design, where the pull rod and main valve core 22 are coaxially arranged for pulling to open, the main valve core 22 has a larger opening area after opening, requiring an additional damping orifice to control the flow rate. This embodiment directly integrates the damping function into the first emergency interface 3111, eliminating the need for additional damping elements, resulting in a more compact structure, simpler assembly, and reduced manufacturing costs. By matching the orifice size of the damping port, the oil flow rate under emergency conditions can be precisely adjusted, ensuring that the platform descends at a safe and stable speed, improving the reliability and controllability of emergency operations.

[0073] In this embodiment, the follower end of the emergency valve core 32 is provided with a slot 322, and the first end of the emergency pull rod 33 is provided in the slot 322 for pulling the emergency valve core 32 to slide along the emergency valve hole 3113.

[0074] Specifically, the follower end of the emergency valve core 32 is the end facing the emergency lever 33 (e.g., Figure 6 The emergency pull rod 33 (shown on the right end) has a slot 322. The first end of the emergency pull rod 33 may have a protruding connecting block 331. The opening size of the slot 322 is larger than the axial size of the protruding connecting block 331, creating a certain axial clearance between them. Simultaneously, the radial size of the slot 322 matches the protruding connecting block 331, ensuring smooth sliding within the slot 322 without excessive radial movement. The protruding connecting block 331 extends into the slot 322, forming a floating connection structure. This means the emergency pull rod 33 and the emergency valve core 32 have relative axial movement allowance while maintaining a proper radial fit. When the emergency pull rod 33 is pulled, its first end, the protruding connecting block 331, first moves backward within the slot 322 until it contacts the side wall of the slot 322 (e.g., the side wall of the slot 322). Figure 6 The emergency valve core 32 moves together with the emergency valve core 32 after contacting the right side wall shown. During the process of the emergency valve core 32 resetting and abutting against the first emergency interface 3111 to achieve a seal, due to the axial gap between the slot 322 and the first end of the emergency pull rod 33 (i.e., the protruding connecting block 331), the emergency valve core 32 can automatically adjust its axial pressing degree according to the position of the first emergency interface 3111. This ensures that the sealing surface at the end of the valve core is tightly fitted with the first emergency interface 3111, achieving a reliable seal, without excessive pressing or misalignment due to the rigid push of the emergency pull rod 33. This ensures the sealing reliability of the emergency valve core 32 and the emergency valve seat 311. In addition, the floating connection allows for a certain axial positional deviation between the emergency pull rod 33 and the emergency valve core 32, eliminating the need for precise axial positioning to achieve force transmission. This significantly reduces the machining accuracy requirements for the coaxiality of the emergency pull rod 33, the emergency valve sleeve 312, and the emergency valve seat 311, simplifies the assembly process, improves the manufacturability and assembly efficiency of the product, and reduces the coaxiality requirements for machining and assembly.

[0075] Therefore, the floating connection between the emergency lever 33 and the emergency valve core 32 not only ensures the reliability of the oil circuit control under emergency conditions, but also simplifies the processing technology, reduces manufacturing costs, and further improves the overall performance of the emergency manual mechanism 3.

[0076] In this embodiment, the sealing end of the emergency valve core 32 is provided with a sealing structure for abutting and sealing the first emergency interface 3111.

[0077] Specifically, the sealing structure is located at the end of the emergency valve core 32 facing the first emergency interface 3111 (e.g. Figure 6The left end (shown) is used to form a seal with the orifice of the first emergency interface 3111, ensuring a reliable seal with the first emergency interface 3111. Under non-emergency conditions, this ensures the emergency oil circuit remains closed, preventing oil leakage; during emergency operation, it can be smoothly opened to allow the emergency oil circuit to function. In this embodiment, the sealing structure is a conical structure, with its conical surface forming a line contact seal or conical surface seal with the edge of the orifice of the first emergency interface 3111. When the emergency elastic element 36 pushes the emergency valve core 32 to the left, the conical surface of the sealing structure presses tightly against the orifice of the first emergency interface 3111, achieving reliable sealing under elastic force and cutting off the connection between the first emergency interface 3111 and the emergency valve orifice 3113. The conical angle design of the conical structure minimizes the contact area between the conical surface and the orifice of the first emergency interface 3111, thereby achieving higher contact stress under the same clamping force, which is beneficial for improving the sealing effect. Meanwhile, the line seal structure can automatically center itself. Even if the emergency valve core 32 experiences slight radial offset or angular deviation during sliding, the radial component force generated when the conical surface contacts the orifice edge can guide the valve core 23 to automatically adjust to a position concentric with the orifice, ensuring the continuity and uniformity of the sealing line, thereby guaranteeing the reliability of the seal. In other embodiments, the sealing structure can also adopt a spherical structure or a planar structure with a sealing gasket. The spherical structure, when combined with the conical orifice, also has good self-centering performance and sealing effect; the planar structure with a sealing gasket achieves sealing through the compression deformation of the elastic sealing element, which is suitable for applications requiring high sealing performance.

[0078] In summary, the hydraulic cylinder control valve provided in this embodiment completely separates the emergency manual mechanism 3 from the solenoid valve 2 in terms of physical structure, and independently sets it on one side of the solenoid valve 2 along its radial direction, forming a parallel layout instead of the traditional embedded through-type structure. This completely avoids the interference or damage of the emergency manual mechanism 3 to the internal oil circuit of the solenoid valve 2, significantly simplifies the internal oil circuit structure of the control valve body 1, and reduces the processing difficulty and manufacturing cost. At the same time, it eliminates the potential leakage channels and jamming risks caused by the through-part, which can effectively improve the sealing reliability and operation stability of the solenoid valve 2, thereby improving the overall reliability of the hydraulic cylinder control valve and ensuring the smoothness of the platform descent and the control accuracy.

[0079] Furthermore, the follower end of the emergency valve core 32 is provided with a slot 322, and the first end of the emergency pull rod 33 is floatingly connected to the slot 322. This not only ensures the reliability of oil circuit control under emergency conditions, but also simplifies the processing technology, reduces manufacturing costs, and further improves the overall performance of the emergency manual mechanism 3.

[0080] In particular, the first emergency interface 3111 is a damping port, integrating the damping function directly into the first emergency interface 3111, eliminating the need for additional damping components, resulting in a more compact structure, simpler assembly, and reduced manufacturing costs. By matching the orifice size of the damping port, the oil flow rate under emergency conditions can be precisely adjusted, ensuring that the platform descends at a safe and stable speed, thus improving the reliability and controllability of emergency operations.

[0081] Platform Implementation Examples: This embodiment also proposes a scissor lift aerial work platform, which is equipped with a hydraulic control system. This hydraulic control system may include the aforementioned cylinder control valve. The specific implementation process of the cylinder control valve is described above and will not be repeated here. In other words, the scissor lift aerial work platform and its hydraulic control system may include a cylinder control valve and a lifting valve. The lifting valve has a lifting working port, an oil inlet, and a return port. The lifting working port is connected to the working connection port of the cylinder control valve. The lifting valve connects the lifting working port to either the oil inlet or the return port. When the lifting working port is connected to the oil inlet, the hydraulic oil introduced through the oil inlet flows sequentially through the lifting working port, the working connection port, and the cylinder connection port into the lifting working oil chamber, achieving the lifting action. When the return port is connected to the lifting working port, and the cylinder control valve manually or electrically controls the working connection port and the cylinder connection port, the hydraulic oil in the lifting working oil chamber flows sequentially through the cylinder connection port, the working connection port, the lifting working port, and the return port into the return oil tank, achieving the lowering action.

[0082] Specifically, when the platform performs a lifting action, the lifting valve activates, connecting the lifting working port to the oil inlet. At this time, pressurized oil from the hydraulic pump enters the lifting valve through the oil inlet, then flows sequentially through the lifting working port, the working connection port of the cylinder control valve, and the cylinder connection port, finally flowing into the lifting working oil chamber to drive the scissor boom to unfold, achieving a smooth lifting of the platform. When the platform needs to descend, the lifting valve activates, connecting the lifting working port to the return oil port. At this time, the oil in the lifting working oil chamber has a tendency to flow back under gravity. Depending on the control method, the cylinder control valve opens either electrically (e.g., solenoid valve 2 in response to an electrical signal) or manually (e.g., emergency manual mechanism 3), connecting the oil passage between its internal working connection port and the cylinder connection port. The oil then flows sequentially from the lifting working oil chamber through the cylinder connection port, the working connection port, the lifting working port, and the return oil port, finally flowing back to the oil tank, achieving a smooth descent of the platform.

[0083] Therefore, it can be seen that the lifting valve is responsible for controlling the switching of oil supply and return directions, while the cylinder control valve is responsible for precisely controlling the opening and closing of the oil circuit during the descent. The two work together to ensure the reliability and controllability of the platform's lifting action.

[0084] Because the hydraulic cylinder control valve has the aforementioned effects, the scissor lift aerial work platform and hydraulic control system equipped with the hydraulic cylinder control valve also have the corresponding technical effects.

[0085] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0086] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A hydraulic cylinder control valve, characterized in that, include: The control valve body is equipped with a working connection port and a hydraulic cylinder connection port; A solenoid valve is mounted on the control valve body and is used to operate in response to an electrical signal to control the opening or closing of the oil passage or the switching of the flow direction between the working connection port and the cylinder connection port on the control valve body. An emergency manual mechanism is provided in parallel with the solenoid valve and is independently provided on one side of the solenoid valve along its radial direction. It is used to manually control the oil passage between the working connection port and the cylinder connection port when the solenoid valve fails, so that the oil at the cylinder connection port can flow out from the working connection port.

2. The hydraulic cylinder control valve according to claim 1, characterized in that, The emergency manual mechanism includes: An emergency valve assembly is provided with a first emergency interface communicating with the working connection port and a second emergency interface communicating with the oil cylinder connection port. Furthermore, the emergency valve assembly is provided with an emergency valve hole arranged along its axial direction, and both the first emergency interface and the second emergency interface are connected to the emergency valve hole. An emergency valve core is slidably disposed within the emergency valve hole along the axial direction of the emergency valve hole, and is used to abut against or move away from the first emergency interface, so that the emergency valve core opens or closes the first emergency interface accordingly, thereby connecting or disconnecting the first emergency port from the second emergency port accordingly. An emergency pull rod is slidably mounted on the emergency valve assembly. The first end of the rod, located inside the emergency valve hole, is connected to the emergency valve core. The second end, located outside the emergency valve hole, serves as an operating end that receives manual operating force. This end is used to pull the emergency valve core away from the first emergency interface, thereby connecting the first emergency interface with the emergency valve hole, and further connecting the first emergency interface with the second emergency interface.

3. The hydraulic cylinder control valve according to claim 2, characterized in that, An emergency elastic element is provided between the emergency valve core and the emergency valve assembly to apply elastic force to the emergency valve core, so that the emergency valve core abuts against the first emergency interface in a free state, thereby closing the first emergency interface, cutting off the connection between the first emergency interface and the emergency valve hole, and further cutting off the connection between the first emergency interface and the second emergency interface.

4. The hydraulic cylinder control valve according to claim 2, characterized in that, The first emergency interface is located at the axial end of the emergency valve assembly and is arranged coaxially with the emergency valve port; The sealing end of the emergency valve core is provided with a sealing structure for abutting and sealing the first emergency interface; The follower end of the emergency valve core is provided with a slot, and the first end of the emergency pull rod is disposed in the slot for pulling the emergency valve core to slide along the emergency valve hole.

5. The hydraulic cylinder control valve according to claim 2, characterized in that, The first emergency interface is a damping port used to control the oil flow rate in order to control the descent speed of the aerial work platform.

6. The hydraulic cylinder control valve according to any one of claims 1 to 5, characterized in that, The solenoid valve includes: The solenoid valve assembly has a first main interface communicating with the working connection port and a second main interface communicating with the cylinder connection port. Furthermore, the solenoid valve assembly has a main valve hole arranged along its axial direction. Both the first main interface and the second main interface are connected to the main valve hole. The main valve core is slidably disposed within the main valve hole along its axial direction, and is used to press against and seal the first main interface to cut off the communication between the first main interface and the main valve hole, thereby cutting off the communication between the first main interface and the second main interface. The main valve core is provided with a pilot valve hole extending along its axial direction and communicating with the main valve hole, a first connecting hole communicating with the first main interface, and a second connecting hole communicating with the second main interface. Both the first connecting hole and the second connecting hole are communicating with the pilot valve hole. When the oil pressure at the first main interface is greater than the oil pressure at the second main interface, the main valve core can move under the action of oil pressure and open the first main interface, so that the first main interface and the second main interface are connected. A pilot valve core is slidably disposed within the pilot valve orifice, and the pilot valve core is connected to an electromagnetic drive assembly for operation in response to an electrical signal, thereby driving the pilot valve core to move against or away from the end of the main valve core, so that the pilot valve core opens or closes the first connection orifice accordingly; when the pilot valve core opens the first connection orifice, the oil in the pilot valve orifice flows through the first connection orifice to the first main interface for depressurization, so that the main valve core can move under the action of the high-pressure oil at the second main interface and open the first main interface, realizing the connection between the first main interface and the second main interface.

7. The hydraulic cylinder control valve according to claim 6, characterized in that, The main valve core is provided with an axial hydraulic force-applying structure, which is used to apply a force away from the first main interface to the main valve core when the main valve core is pressed against the first main interface.

8. The hydraulic cylinder control valve according to claim 6, characterized in that, The pilot valve core is provided with a main elastic element on the side opposite to the main valve core, which is used to provide elastic force for the pilot valve core and the main valve core to reset; A secondary elastic element is provided between the main valve core and the pilot valve core to provide elastic buffer when the pilot valve core resets toward the main valve core, so as to absorb the impact kinetic energy of the pilot valve core and thus limit the impact force of the main valve core on the solenoid valve assembly.

9. A scissor lift aerial work platform, characterized in that, The device is equipped with a hydraulic cylinder control valve as described in any one of claims 1 to 8.

10. The scissor lift aerial work platform according to claim 9, characterized in that, The scissor lift aerial work platform also includes: A lifting control valve is provided with a lifting working port, an oil inlet, and an oil return port. The lifting working port is connected to the working connection port of the cylinder control valve. The lifting control valve is used to connect the lifting working port with the oil inlet or the oil return port. When the lifting working port is connected to the oil inlet, the hydraulic oil introduced through the oil inlet flows sequentially through the lifting working port, the working connection port, and the cylinder connection port into the lifting working oil chamber to achieve the lifting action. When the oil return port is connected to the lifting working port, and the cylinder control valve manually or electromagnetically controls the working connection port and the cylinder connection port, the hydraulic oil in the lifting working oil chamber flows sequentially through the cylinder connection port, the working connection port, the lifting working port, and the oil return port into the return oil tank to achieve the lowering action.

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