A multi-way valve with automatic oil replenishment function

Abstract

A multi-way valve with an automatic oil replenishment function. It solves the problem that the oil in the existing engineering machinery telescopic arm pipeline cannot be maintained for a long time. It includes a valve body and a valve stem. The valve body includes a first oil port, a second oil port, an oil inlet and an oil return port. The valve stem is arranged in the valve body and slidably cooperates with the valve body. One end of the valve stem is provided with a first processing hole. The first processing hole is provided with an oil replenishment assembly. The oil replenishment assembly includes an oil replenishment valve core. The valve stem has a first position when installed and a second position when working so that the oil inlet is connected to the first oil port. The oil replenishment valve core has a first position when the valve stem is in the first position so that the oil inlet is connected to the second oil port for system oil replenishment and a second position when closed. The present invention also has the advantages of simple structure, easy assembly, reliable operation, long service life, and a mid-position automatic oil replenishment function.

Description

Technical Field

[0001] The present invention relates to engineering machinery, in particular to a multi-way valve with an automatic oil replenishing function. Background Art

[0002] For large aerial work platforms, the boarding action is mainly controlled by two multi-way valves, the platform multi-way valve and the turntable multi-way valve. The turntable valve is located at the chassis turntable position (one end of the boom is close to the ground), and the platform multi-way valve is located at the platform position at the end of the aerial boom (the other end of the boom, away from the ground). There is a pipeline of dozens of meters between the two valves. When the aerial work platform is fully extended and operates at a large angle, after a long period of static state and under the action of gravity, the oil in the pipeline cannot be maintained for a long time, and it is easy to have insufficient oil in the pipeline. When starting to move again, the oil will fill the pipeline first and then let the platform valve work, which will cause the platform action response delay and then impact, especially when it comes to automatic leveling (automatic leveling: when the boom is adjusted, the platform leveling follows as the angle changes to ensure that the platform is always level). The delay or impact of the leveling action will cause the platform to tilt too much, which will bring extremely bad experience and safety hazards to people working at heights. Other engineering machinery with telescopic booms, such as fire trucks, cranes, truck cranes, etc., which have valves or cylinders at the ends of the booms that require oil supply, also have similar problems.

[0003] In order to solve this problem, some main engine manufacturers passively replenish oil by increasing the back pressure in the return oil of the turntable multi-way valve, but high-meter booms often require a larger back pressure to replenish them. Increasing the back pressure will increase power consumption in the normal process, and excessive back pressure may cause the balance valve or hydraulic lock to open incorrectly when the high back pressure impacts, posing a certain safety hazard; some main engine manufacturers rely on the neutral position function of the turntable multi-way valve stem to seal the oil, but because the multi-way valve is a sliding valve structure, it cannot maintain pressure for a long time; some hosts add an electric control oil replenishment valve and use the standby pressure of the load-sensitive pump to replenish oil to the pipeline of the platform multi-way valve. When performing other actions, the oil replenishment line is cut off by switching the state of the electric control oil replenishment valve. Although this can solve the problem, it not only requires adding a solenoid valve and the corresponding pipeline, but also requires adding a port to the controller, and requires program control. When there is a problem with the electrical system or control system, it will not only affect the oil replenishment, but also the normal operation of other actions. Summary of the Invention

[0004] In order to solve the problem in the background art that the oil in the pipeline of the existing engineering machinery telescopic arm cannot be maintained for a long time, the present invention provides a multi-way valve with an automatic oil replenishment function.

[0005] The technical solution of the present invention is: a multi-way valve with an automatic oil replenishment function, including a valve body and a valve stem, the valve body including a first oil port, a second oil port, an oil inlet and an oil return port, the valve stem is arranged in the valve body and slidingly cooperates with the valve body, one end of the valve stem is provided with a first processed hole, the first processed hole is provided with an oil replenishment assembly, the oil replenishment assembly includes an oil replenishment valve core, the valve stem has a first position when installed and a second position when working so that the oil inlet is connected to the first oil port, the oil replenishment valve core has a first position when the valve stem is in the first position so that the oil inlet is connected to the second oil port for system oil replenishment and a second position when closed.

[0006] An improvement of the present invention is that the valve stem is provided with a first oil extraction hole and an oil replenishing hole, the oil replenishing valve core is provided with a first oil replenishing groove, and the pressure oil at the oil inlet is connected to the second oil port through the first oil extraction hole, the first oil replenishing groove and the oil replenishing hole when the valve stem is in the first position.

[0007] An improvement of the present invention is that the valve body blocks the oil replenishing hole and the first oil extraction hole when the valve stem is in the second position.

[0008] An improvement of the present invention is that the valve body is provided with a feedback oil port, the valve stem is provided with a second oil extraction hole, the oil replenishing valve core is provided with a first oil replenishing port and a control chamber, the feedback oil of the feedback oil port is connected to the control chamber through the second oil extraction hole and the first oil replenishing port and is used to push the oil replenishing valve core to move and close.

[0009] An improvement of the present invention is that a control damping is provided in the control cavity.

[0010] An improvement of the present invention is that a flow control valve is provided on the oil replenishing valve core, and the pressure oil at the oil inlet is connected to the second oil port through the first oil extraction hole, the flow control valve, the first oil replenishing groove, and the oil replenishing hole when the valve stem is in the first position.

[0011] An improvement of the present invention is that the oil replenishing valve core is provided with a second oil replenishing port connected to the first oil extraction hole and a third oil replenishing port connected to the first oil replenishing groove, the third oil replenishing port is connected to the first oil replenishing groove, the flow control valve includes a flow control valve core and a flow control valve seat, and the flow control valve core and the flow control valve seat are arranged to slide relative to each other.

[0012] An improvement of the present invention is that the flow control valve is a constant flow valve and / or a pressure reducing valve.

[0013] An improvement of the present invention is that the oil-supply valve core is concentrically installed in the first processed hole of the valve stem relative to the valve stem and can slide relative to the valve stem. The valve stem is provided with a screw plug for limiting the stroke of the oil-supply valve core. An elastic member is provided in the first processed hole. The elastic member is offset against the oil-supply valve core and has a pre-compression amount.

[0014] An improvement of the present invention, the elastic member is arranged at the other end of the oil supply valve core relative to the screw plug, a spring chamber is formed between the oil supply valve core and the valve stem, an oil return hole is provided on the valve stem, the spring chamber is connected to the oil return port through the oil return hole, and the oil supply valve core is provided with a support column and / or support groove for limiting the elastic member.

[0015] The present invention has the beneficial effect of automatically replenishing oil to the oil ports loaded by long pipelines by utilizing the working oil ports of the multi-way valve, thereby avoiding increased costs for the hydraulic and electrical systems and simplifying the control process. Furthermore, the oil replenishment valve core is built into the valve stem, simplifying the valve body layout and reducing the weight of the valve. The present invention also has the advantages of simple structure, easy assembly, reliable operation, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 This is a structural diagram of the oil replenishment state in embodiment 1 of the present invention.

[0017] Attachment Figure 2 This is a structural diagram of a non-oil replenishment state in accordance with an embodiment of the present invention.

[0018] Attachment Figure 3 For attachment Figure 1 Schematic diagram of the structure of the middle valve stem.

[0019] Attachment Figure 4 For attachment Figure 3 Schematic diagram of the cross-sectional structure.

[0020] Attachment Figure 5 For attachment Figure 2 Schematic diagram of the structure of the middle oil supply valve core.

[0021] Attachment Figure 6 For attachment Figure 5 Schematic diagram of the cross-sectional structure.

[0022] Attachment Figure 7 For attachment Figure 1 Schematic diagram of the enlarged structure at point I.

[0023] Attachment Figure 8 This is a structural diagram of the oil replenishment state in the second embodiment of the present invention.

[0024] Attachment Figure 9 This is a structural diagram of the non-oil replenishment state of the second embodiment of the present invention.

[0025] Attachment Figure 10 For attachment Figure 8 Schematic diagram of the structure of the oil replenishment component.

[0026] In the figure, 1. valve body; 11. first oil port; 12. second oil port; 13. oil inlet; 14. oil return port; 15. feedback oil port; 2. valve stem; 21. first machining hole; 22. first oil extraction hole; 23. oil replenishing hole; 24. second oil extraction hole; 25. oil return hole; 3. oil replenishing assembly; 4. oil replenishing valve core; 41. first oil replenishing groove; 42. first oil replenishing port; 43. control chamber; 45. control damping; 46. second oil replenishing port; 47. third oil replenishing port; 48. support groove; 5. flow control valve; 51. flow control valve core; 52. flow control valve seat; 6. screw plug; 7. elastic member; 71. spring chamber. DETAILED DESCRIPTION

[0027] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0028] Depend on Figure 1 Combine Figure 2-10 As shown, a multi-way valve with an automatic oil replenishment function includes a valve body 1 and a valve stem 2. The valve body 1 includes a first oil port 11, a second oil port 12, an oil inlet port 13, and an oil return port 14. The valve stem 2 is disposed within the valve body 1 and slidably engages with the valve body 1. One end of the valve stem 2 is provided with a first machined hole 21, and an oil replenishment assembly 3 is disposed within the first machined hole 21. The oil replenishment assembly 3 includes an oil replenishment valve core 4. The valve stem 2 has a first position when installed and a second position when in operation, connecting the oil inlet port 13 to the first oil port 11. The oil replenishment valve core 4 has a first position when the valve stem 2 is in the first position, connecting the oil inlet port 13 to the second oil port 12 for system oil replenishment, and a second position when closed. The beneficial effect of the present invention is that the working oil ports of the multi-way valve are used to automatically replenish oil ports with long pipeline loads, thereby avoiding increased costs for the hydraulic and electrical systems and simplifying the control program. In addition, the oil replenishment valve core is built into the valve stem, simplifying the valve body layout and reducing the weight of the valve. The present invention also boasts advantages such as simple structure, easy assembly, reliable operation, and long service life. Specifically, based on existing technology, this patent utilizes an unused working oil port in the working connection of the turntable multi-way valve supplying oil to the platform as an automatic oil replenishment port, thereby realizing a multi-way valve capable of automatic oil replenishment. Specifically, a second machined hole is provided on the side of the valve stem opposite the first machined hole, and a pressure compensator is installed in this second machined hole.

[0029] Further explanation is given in conjunction with the accompanying drawings. P1 / P2 is the system oil supply port, i.e., the oil inlet, and P1 and P2 are connected inside the valve body, i.e., the oil inlet. LS1 is the load feedback oil circuit on the left side of the valve, and LS2 is the load feedback oil circuit on the right side of the valve, and LS1 and LS2 are connected inside the valve body. LS1 and LS2 are the feedback oil ports. T is the return port of the multi-way valve. A / B are the working oil ports of the multi-way valve, and A is the working port for long-line oil supply, i.e., the first oil port, and B is the replenishment port for automatic oil replenishment, i.e., the second oil port. The other actions of the main engine are similar to the working principle of the A oil port. When the valve stem moves to the right, the hydraulic oil in the oil inlet (the oil inlet to the left of the P1 port) enters the pressure compensator, pushes the compensator open and enters the A oil port. At the same time, the load feedback oil is taken through the compensator and enters LS1. Since LS1 and LS2 are connected, the load feedback oil can act on the load feedback oil circuits of multiple working links.

[0030] This patent states that when the main engine is not working, all actions are inactive, all the connecting valve stems of the multi-way valve are in the middle position (usually the position when installed), the load feedback pressure is zero, and the hydraulic pump of the system is in a low-pressure standby state (the load-sensitive pump has a standby pressure, and the gear pump system is bypassed through a three-way diverter valve and also has a standby pressure). Depending on the model, the standby pressure is generally about 10-25 bar.

[0031] In order to facilitate the understanding of this patent, the working principle of the embodiment 1 is introduced as an example. Figure 1 and Figure 2 As shown, when the system is not working, the hydraulic oil on standby at the oil inlet enters the first processing hole through the first oil extraction hole. Since there is no pressure in the load feedback (the pressure of LS1 and LS2 is zero), the valve core is in Figure 1 In the working state, the P oil groove on the valve stem (not marked in the figure) is connected to the first oil groove on the oil replenishment valve core. The hydraulic oil enters the oil replenishment hole through the first oil groove and enters the B port of the valve body to replenish oil to the A port pipeline (the AB oil ports can be connected inside the valve body, or outside the valve body through pipelines).

[0032] When the system is working in the same link, the oil supply valve core and the oil supply valve core work at port A on the same valve stem. At this time, the valve core moves to the right. Before the dead zone of port A is exceeded (that is, when the valve stem in this patent moves from the first position to the second position), the oil supply hole on the valve stem will be covered by the valve body, and the oil supply hole will not be connected to port B. At this time, the oil supply function is automatically closed. As the valve stem continues to move to the right, the first oil extraction hole on the valve stem is also covered by the valve body, and the first oil extraction hole is also not connected to P2. At this time, the double protection of oil supply closure is achieved. When the action stops, the valve stem returns to the middle position, and there is no pressure on LS1 and LS2. At this time, the oil supply hole on the valve stem is connected to port B, and the first oil extraction hole on the valve stem is also connected to P2. The oil supply function is automatically opened through the first oil supply groove on the oil supply valve core.

[0033] When other links of the system are working, other valve stems in different working links with the oil supply valve core will move, so that when other working ports are working, when other valve stems are switched and pressure is gradually built up, load feedback LS1 and LS2 will also gradually have pressure (the existing technology will not be described in detail here). At this time, the pressure oil of LS2 will pass through the second oil extraction hole on the valve stem, enter the first oil supply port, and pass through the control chamber and the control damping to enter the right end face of the oil supply valve core. Since the setting value of the spring (elastic member) is relatively low, only very low pressure is needed to push the oil supply valve core to switch to the leftmost end (such as Figure 2 (as shown), the hydraulic oil in the spring chamber, where the spring resides, flows sequentially through the oil return hole into port T. At this point, the first oil extraction hole on the valve stem is disconnected from the first oil supply groove on the oil supply valve core, automatically disabling the oil supply function. When the action ceases, load feedback releases pressure, and both LS1 and LS2 are depressurized. The spring's return force now causes the oil supply valve core to move rightward, automatically activating the oil supply function. Controlled damping ensures smooth movement of the oil supply valve core and delays the activation of the automatic oil supply function after other actions cease, preventing them from being affected.

[0034] More specifically, if there is a requirement for the oil replenishment flow rate, it can be achieved by limiting the size of the oil replenishment hole on the basis of the first embodiment. If there is a precise requirement for the flow rate, it can be achieved by adding a throttle valve with pressure compensation (referred to as a constant flow valve) to the oil replenishment valve core. This is the core idea of ​​the second embodiment. When the system is not working, the hydraulic oil on standby at P2 enters the first processing hole through the first oil extraction hole. Since there is no pressure in the load feedback (the pressure of LS1 and LS2 is zero), the valve core is in Figure 8 In the working state, the pressure oil and hydraulic oil on the valve stem enter the flow control valve through the second oil replenishment port, and enter the oil inlet of the flow control valve (constant flow valve). The oil outlet of the constant flow valve is connected to the third oil replenishment port. The hydraulic oil enters the B port of the valve body through the first oil replenishment groove and the oil replenishment hole of the third oil replenishment port, and replenishes oil to the A port pipeline (the AB oil ports can be connected inside the valve body, or connected outside the valve body through a pipeline) to ensure that the oil replenishment flow does not exceed the set value.

[0035] The valve stem 2 is provided with a first oil extraction hole 22 and an oil replenishment hole 23, and the oil replenishment valve core 4 is provided with a first oil replenishment groove 41. When the valve stem 2 is in the first position, pressurized oil from the oil inlet 13 is connected to the second oil port 12 through the first oil extraction hole 22, the first oil replenishment groove 41, and the oil replenishment hole 23. Specifically, the outer surface of the oil replenishment valve core is recessed inward to form the first oil replenishment groove. This allows oil to be replenished to the system when the valve stem is in the first position.

[0036] The valve body 1 blocks the oil replenishing hole 23 and the first oil extraction hole 22 when the valve stem is in the second position. Such a structure does not affect the system performance when the product is normally supplying oil and the oil replenishing valve core is not working.

[0037] The valve body 1 is provided with a feedback oil port 15, the valve stem 2 is provided with a second oil intake hole 24, and the oil replenishing valve core 4 is provided with a first oil replenishing port 42 and a control chamber 43. The feedback oil of the feedback oil port 15 is connected to the control chamber 43 through the second oil intake hole 24 and the first oil replenishing port 42 and is used to push the oil replenishing valve core 4 to move and close. The first oil intake hole, the second oil intake hole, and the oil replenishing hole are all processed along the radial direction of the valve stem, and the number is greater than or equal to 2, and they are evenly distributed in the circumferential direction. This structure allows the product to close the oil replenishing valve core even when other links are working, without affecting the system performance. Specifically, the first oil replenishing port, the second oil replenishing port, and the third oil replenishing port are all processed along the radial direction of the oil replenishing valve core, and the number is greater than or equal to 2, and they are evenly distributed in the circumferential direction.

[0038] A control damper 45 is provided in the control chamber 43. The control damper is used to control the smoothness of the movement of the oil supply valve core.

[0039] The oil replenishing valve core 4 is provided with a flow control valve 5. When the valve stem 2 is in the first position, the pressure oil of the oil inlet 13 is connected to the second oil port 12 through the first oil extraction hole 22, the flow control valve 5, the first oil replenishing groove 41, and the oil replenishing hole 23. Specifically, the oil replenishing valve core 4 is provided with a second oil replenishing port 46 for connecting to the first oil extraction hole 22 and a third oil replenishing port 47 connected to the first oil replenishing groove 41. The third oil replenishing port 47 is connected to the first oil replenishing groove 41. The flow control valve 5 includes a flow control valve core 51 and a flow control valve seat 52. The flow control valve core 51 and the flow control valve seat 52 are arranged to slide relative to each other. The flow control valve 5 is specifically a constant flow valve and / or a pressure reducing valve. The flow control valve is provided to control the amount or pressure of the replenishing oil, thereby realizing constant flow and / or constant pressure replenishing oil, which is convenient and reliable to control.

[0040] The oil-supply valve core 4 is concentrically mounted within the first machined hole 21 of the valve stem 2 and is capable of sliding relative to the valve stem 2. A screw plug 6 is provided on the valve stem 2 to limit the travel of the oil-supply valve core 4. An elastic member 7 is located within the first machined hole 21, abutting against the oil-supply valve core 4 and providing a pre-compression. Specifically, the elastic member 7 is located at the end of the oil-supply valve core 4 opposite the screw plug 6. A spring chamber 71 is formed between the oil-supply valve core 4 and the valve stem 2. An oil return hole 25 is provided on the valve stem 2, connecting the spring chamber 71 to the oil return port 14 via the oil return hole 25. The oil-supply valve core 4 is provided with a support column and / or support groove 48 to limit the position of the elastic member 7. Due to the spring force of the elastic member, the oil-supply valve core is initially positioned at the rightmost end of the valve stem, with its travel limited by the screw plug. During other operating conditions, the first oil-supply port draws oil and pushes the oil-supply valve core against the leftmost end of the valve stem, thereby closing the oil-supply valve core and preventing oil replenishment. The support column and / or support groove facilitates the installation and fixation of the elastic member, has a simple structure and is easy to assemble.

[0041] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] Technical personnel should note: Although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention. Any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A multi-way valve with an automatic oil replenishment function, comprising a valve body (1) and a valve stem (2), wherein the valve body (1) comprises a first oil port (11), a second oil port (12), an oil inlet port (13) and an oil return port (14), and the valve stem (2) is arranged in the valve body (1) and is slidably engaged with the valve body (1), characterized in that : A first machining hole (21) is provided at one end of the valve stem (2), an oil replenishing assembly (3) is provided in the first machining hole (21), the oil replenishing assembly (3) includes an oil replenishing valve core (4), the valve stem (2) has a first position when installed and a second position when working so that the oil inlet (13) is connected to the first oil port (11), the oil replenishing valve core (4) has a first position when the valve stem (2) is in the first position so that the oil inlet (13) is connected to the second oil port (12) for system oil replenishment and a second position when closed; a first oil extraction hole (22) and an oil replenishing hole (23) are provided on the valve stem (2), and a first oil replenishing groove (41) is provided on the oil replenishing valve core (4), and the pressure oil of the oil inlet (13) is discharged through the first oil extraction hole (22) when the valve stem (2) is in the first position. The valve body (1) is provided with a feedback oil port (15), the valve stem (2) is provided with a second oil extraction port (24), the oil extraction valve core (4) is provided with a first oil extraction port (42) and a control chamber (43), the feedback oil of the feedback oil port (15) is connected to the control chamber (43) through the second oil extraction port (24) and the first oil extraction port (42) and is used to push the oil extraction valve core (4) to move and close; the oil extraction valve core (4) is provided with a flow control valve (5), and the pressure oil of the oil inlet (13) is connected to the second oil port (12) through the first oil extraction port (22), the flow control valve (5), the first oil extraction port (41), the oil extraction port (23) when the valve stem (2) is in the first position.

2. A multi-way valve with automatic oil replenishment function according to claim 1, characterized in that The valve body (1) blocks the oil supply hole (23) and the first oil extraction hole (22) when the valve stem is in the second position.

3. The multi-way valve with automatic oil replenishment function according to claim 1, characterized in that A control damper (45) is provided in the control chamber (43).

4. The multi-way valve with automatic oil replenishment function according to claim 1, characterized in that The oil replenishing valve core (4) is provided with a second oil replenishing port (46) for connecting to the first oil extraction hole (22) and a third oil replenishing port (47) connected to the first oil replenishing groove (41), and the third oil replenishing port (47) is connected to the first oil replenishing groove (41). The flow control valve (5) includes a flow control valve core (51) and a flow control valve seat (52), and the flow control valve core (51) and the flow control valve seat (52) are arranged to slide relative to each other.

5. The multi-way valve with automatic oil replenishment function according to claim 1, characterized in that The flow control valve (5) is a constant flow valve and / or a pressure reducing valve.

6. The multi-way valve with automatic oil replenishment function according to claim 1, characterized in that The oil supply valve core (4) is concentrically mounted relative to the valve stem (2) in the first machining hole (21) of the valve stem (2) and can slide relative to the valve stem (2). The valve stem (2) is provided with a screw plug (6) for limiting the stroke of the oil supply valve core (4). An elastic member (7) is provided in the first machining hole (21). The elastic member (7) is in contact with the oil supply valve core (4) and has a pre-compression amount.

7. The multi-way valve with automatic oil replenishment function according to claim 6, characterized in that The elastic member (7) is provided at the other end of the oil supply valve core (4) relative to the screw plug (6), and a spring chamber (71) is formed between the oil supply valve core (4) and the valve stem (2). The valve stem (2) is provided with an oil return hole (25), and the spring chamber (71) is connected to the oil return port (14) through the oil return hole (25). The oil supply valve core (4) is provided with a support column and / or a support groove (48) for limiting the elastic member (7).

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