Quick response pilot segmented control mechanism

Abstract

The present invention relates to a hydraulic reversing mechanism, specifically a fast-response pilot segmented control mechanism, which includes a housing and a valve structure disposed within the housing. The housing includes two pilot pressure oil ports, two oil outlets, and one oil inlet for external connection. Pilot pressure chambers are formed at both of the two pilot pressure oil ports, and a reversing valve moving chamber is formed within the housing. The valve structure includes a damping valve core disposed in the pilot pressure chamber, a damping valve core spring, and a reversing valve core disposed in the reversing valve moving chamber. The pilot pressure chamber and the reversing valve moving chamber are connected through a fast-response damping hole. A reversing damping hole is provided on the damping valve core, and a valve core thimble capable of abutting against the reversing damping hole is provided on the end face of the reversing valve core. The diameter of the fast-response damping hole is larger than that of the reversing damping hole, and the pilot pressure oil can flow into the reversing valve moving chamber through the fast-response damping hole or the reversing damping hole. The fast-response pilot segmented control mechanism of the present invention has a fast response speed and good stability.

Description

Technical Field

[0001] The present invention relates to a hydraulic reversing mechanism, and more particularly to a fast-response pilot segmented control mechanism. Background Art

[0002] The switching of the oil circuit is a common control operation in a hydraulic control system, which can change the oil circuit connection condition of the hydraulic system, so as to realize the switching of different control oil circuits and the switching of the functions of the hydraulic system.

[0003] A hydraulic reversing mechanism is a common mechanism in a hydraulic system for switching the oil circuit, which can realize the switching of the oil flow direction of the oil at the oil inlet end to different oil outlet ends.

[0004] When the spool of the reversing valve in the existing hydraulic reversing mechanism moves to realize the switching of the oil circuit, there is basically a certain ineffective stroke (i.e., dead zone). Due to the existence of the dead zone, in the initial stage of reversing of the hydraulic reversing mechanism, the pilot pressure oil slowly flows into the moving chamber of the reversing valve from the damping hole to realize the movement of the spool of the reversing valve, so that the time taken for the spool of the reversing valve to pass through the dead zone is relatively long, the response time is long, and the reversing efficiency of the hydraulic reversing mechanism is low.

[0005] In view of this, there is a need to provide a fast-response pilot segmented control mechanism. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a fast-response pilot segmented control mechanism with fast response speed and good stability.

[0007] To solve the above technical problem, the present invention provides a fast-response pilot segmented control mechanism, including a housing and a valve structure disposed in the housing. The housing includes a first pilot pressure oil port, a first oil outlet, a second oil outlet, an oil inlet, and a second pilot pressure oil port for external connection. Pilot pressure chambers are formed at both the first pilot pressure oil port and the second pilot pressure oil port. A reversing valve moving chamber is formed in the housing. The valve structure includes a damping spool disposed in the pilot pressure chamber, a damping spool spring, and a reversing valve spool disposed in the reversing valve moving chamber. The pilot pressure chamber is communicated with the reversing valve moving chamber via a fast-response damping hole. A reversing damping hole is provided on the damping spool. A valve core thimble capable of abutting against the damping spool is provided on the end face of the reversing valve spool. The diameter of the fast-response damping hole is larger than the diameter of the reversing damping hole, so that in the working state, the pilot pressure oil in the pilot pressure chamber can flow into the reversing valve moving chamber via the fast-response damping hole or the reversing damping hole.

[0008] Further, the housing includes a main housing and pilot control end caps at both ends, and a pilot pressure chamber is formed in each of the pilot control end caps; a directional valve moving chamber is formed at the connection between the main housing and each of the pilot control end caps, and each of the directional valve moving chambers is adapted to accommodate the end of the directional valve spool and is respectively communicated with the corresponding pilot pressure chamber; a first oil outlet chamber communicated with the first oil outlet, an oil inlet chamber communicated with the oil inlet, and a second oil outlet chamber communicated with the second oil outlet are sequentially formed in the main housing.

[0009] Further, the damping spool spring at the first pilot pressure oil port is pre-compressed between the first pilot pressure oil port and the corresponding damping spool, so as to be able to apply a thrust to the damping spool, causing the damping spool to move towards the corresponding quick-response damping hole and abut against the quick-response damping hole; the damping spool spring at the second pilot pressure oil port is pre-compressed between the second pilot pressure oil port and the corresponding damping spool, so as to be able to apply a thrust to the damping spool, causing the damping spool to move towards the corresponding quick-response damping hole and abut against the quick-response damping hole.

[0010] Optionally, an oil passage is provided inside the damping spool, a quick-response pipeline communicated with the oil passage is provided on the side surface of the damping spool, and a commutation damping hole communicated with the oil passage is provided at one end of the damping spool close to the quick-response damping hole.

[0011] Further, when the damping spool is in the first state position, the damping spool is away from the corresponding quick-response damping hole, and the valve core thimble abuts against the commutation damping hole, closing the commutation damping hole. The pilot pressure oil sequentially flows into the pilot pressure chamber through the oil passage and the quick-response pipeline, and flows into the directional valve moving chamber through the quick-response damping hole; when the damping spool is in the second state position, the damping spool abuts against the corresponding quick-response damping hole, closing the quick-response damping hole. The pilot pressure oil sequentially flows into the directional valve moving chamber through the oil passage and the commutation damping hole.

[0012] Further, a drain damping chamber is also provided in the main housing. The drain damping chamber is communicated with the directional valve moving chamber through a drain damping pipeline. A drain damping member is provided in the drain damping pipeline, and a drain damping hole is provided on the drain damping member.

[0013] Further, the drain damping member is detachably installed in the drain damping pipeline.

[0014] Further, the spool of the directional control valve includes a first large-diameter section, a small-diameter section, and a second large-diameter section, such that when the small-diameter section moves to the first oil outlet chamber, the oil in the oil inlet chamber enters the first oil outlet chamber; when the small-diameter section moves to the second oil outlet chamber, the oil in the oil inlet chamber enters the second oil outlet chamber.

[0015] Further, an oil passage groove of the first large-diameter section is provided at a portion of the first large-diameter section in contact with the small-diameter section, and an oil passage groove of the second large-diameter section is provided at a portion of the second large-diameter section in contact with the small-diameter section; when an end face of an end of the first large-diameter section in contact with the small-diameter section is flush with a side wall of the oil inlet chamber close to the first oil outlet chamber, a distance between an end of the oil passage groove of the first large-diameter section close to the first oil outlet chamber and a side wall of the first oil outlet chamber close to the oil inlet chamber is a first dead zone distance, and a distance between an abutting portion of the damping spool in the second pilot pressure oil port abutting against the corresponding quick response damping hole and the quick response damping hole is a first quick response distance; when an end face of an end of the second large-diameter section in contact with the small-diameter section is flush with a side wall of the oil inlet chamber close to the second oil outlet chamber, a distance between an end of the oil passage groove of the second large-diameter section close to the first oil outlet chamber and a side wall of the first oil outlet chamber close to the oil inlet chamber is a second dead zone distance, and a distance between an abutting portion of the damping spool in the first pilot pressure oil port abutting against the corresponding quick response damping hole and the quick response damping hole is a second quick response distance.

[0016] Further, the first quick response distance is equal to the first dead zone distance, and the second quick response distance is equal to the second dead zone distance.

[0017] Through the above technical solution, the fast-response pilot segmented control mechanism provided by the present invention is provided with a pilot pressure chamber in the pilot pressure oil port, the pilot pressure chamber is communicated with the moving chamber of the reversing valve through a fast-response damping hole, a damping valve core is arranged in the pilot pressure chamber, a reversing damping hole is arranged on the damping valve core, and a damping valve core spring is arranged between the damping valve core and the pilot pressure oil port, so that the damping valve core spring can push the damping valve core to move towards the fast-response damping hole and abut against the fast-response damping hole. Thus, when the damping valve core is not abutted against the fast-response damping hole, the pilot pressure oil can first enter the pilot pressure chamber and then enter the moving chamber of the reversing valve through the fast-response damping hole to drive the reversing valve core to move. Until the damping valve core abuts against the fast-response damping hole, the pilot pressure oil will directly flow into the moving chamber of the reversing valve through the reversing damping hole to drive the reversing valve core to move until the oil circuit is switched. Among them, the diameter of the fast-response damping hole is larger than the diameter of the reversing damping hole. Thus, in the initial stage of oil circuit switching, the pilot pressure oil can quickly flow into the moving chamber of the reversing valve through the larger-diameter fast-response damping hole, so that the reversing valve core can move quickly, thereby reducing the time taken for the reversing valve core to pass through the dead zone, improving the response speed of the fast-response pilot segmented control mechanism. After passing through the dead zone, the pilot pressure oil will flow into the moving chamber of the reversing valve through the smaller-diameter reversing damping hole. Thus, the smaller-diameter reversing damping hole can play a good filtering role, improving the stability of the reversing valve core during movement, and also facilitating the precise control of the movement of the reversing valve core, making the fast-response pilot segmented control mechanism have good stability and high control accuracy.

[0018] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the schematic diagram of the fast-response pilot segmented control mechanism of the present invention;

[0020] Figure 2 is the structural schematic diagram of the damping valve core in the first state position in the fast-response pilot segmented control mechanism of the present invention;

[0021] Figure 3 is the structural schematic diagram of the damping valve core in the second state position in the fast-response pilot segmented control mechanism of the present invention;

[0022] Figure 4 is the partial enlarged view of the damping valve core and the oil drain damping member in the fast-response pilot segmented control mechanism of the present invention.

[0023] DESCRIPTION OF THE REFERENCE NUMERALS

[0024] 1 - Housing 11 - Moving chamber of the reversing valve

[0025] 2 - Directional valve spool, 21 - Spool thimble

[0026] 22 - First large - diameter section, 221 - Oil - passage groove in the first large - diameter section

[0027] 23 - Small - diameter section, 24 - Second large - diameter section

[0028] 241 - Oil - passage groove in the second large - diameter section, 3 - Damping spool

[0029] 31 - Commutation damping hole, 32 - Oil - passage pipeline

[0030] 33 - Quick - response pipeline, 4 - Pilot control end - cover

[0031] 41 - Pilot pressure chamber, 5 - Oil - drain damping pipeline

[0032] 51 - Oil - drain damping part, 511 - Oil - drain damping hole

[0033] 6 - Damping spool spring, 7 - Quick - response damping hole

[0034] L - Oil - drain damping chamber, L1 - Second quick - response distance

[0035] L3 - First dead - zone distance, L4 - Second dead - zone distance

[0036] PK1 - First pilot pressure oil port, PK2 - Second pilot pressure oil port

[0037] A - First oil - outlet chamber, B - Second oil - outlet chamber

[0038] P - Oil - inlet chamber Detailed implementation manners

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present invention can be understood according to specific situations. In addition, the value ranges below are all a feasible implementation range, and the specific range can be adjusted according to actual needs.

[0040] The following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0041] Such as Figure 2As shown, in an embodiment of the fast-response pilot segmented control mechanism provided by the present invention, the fast-response pilot segmented control mechanism includes a housing 1 and a valve structure disposed within the housing 1. The housing 1 includes a first pilot pressure oil port PK1 for external connection, a first oil outlet, a second oil outlet, an oil inlet, and a second pilot pressure oil port PK2. A directional valve movement chamber 11 is formed within the housing 1. The first pilot pressure oil port PK1 and the second pilot pressure oil port PK2 are respectively arranged at both ends of the directional valve movement chamber 11. Pilot pressure chambers 41 are formed at both the first pilot pressure oil port PK1 and the second pilot pressure oil port PK2, so as to be able to inject pilot pressure oil into the directional valve movement chamber 11 through the pilot pressure chambers 41 of the first pilot pressure oil port PK1 or the second pilot pressure oil port PK2 (i.e., from different directions), enabling the directional valve spool 2 within the directional valve movement chamber 11 to move in different directions, thereby achieving the switching of the oil circuit. Specifically, the structures at the first pilot pressure oil port PK1 and the second pilot pressure oil port PK2 are similar, as Figure 2 and Figure 3 shown. Taking the side where the first pilot pressure oil port PK1 is located as an example, a damping valve spool 3, a damping valve spool spring 6, and a directional valve spool 2 disposed within the directional valve movement chamber 11 are provided within the pilot pressure chamber 41. The pilot pressure chamber 41 communicates with the directional valve movement chamber 11 via a fast-response damping hole 7. The damping valve spool spring 6 is arranged to be able to provide a thrust to the damping valve spool 3, enabling the damping valve spool 3 to move towards the fast-response damping hole 7 and abut against the fast-response damping hole 7. In addition, a commutation damping hole 31 is provided on the damping valve spool 3, and a valve core thimble 21 capable of abutting against the damping valve spool 3 is provided on the end face of the directional valve spool 2. The diameter of the fast-response damping hole 7 is larger than the diameter of the commutation damping hole 31, and pilot pressure oil can flow into the directional valve movement chamber 11 via the fast-response damping hole 7 or the commutation damping hole 31.

[0042] Through the above technical solution, the fast-response pilot segmented control mechanism provided by the present invention is provided with a pilot pressure chamber 41 in the pilot pressure oil port, connects the pilot pressure chamber 41 to the moving chamber 11 of the reversing valve through a fast-response damping hole 7, arranges a damping valve core 3 in the pilot pressure chamber 41, sets a reversing damping hole 31 on the damping valve core 3, and arranges a damping valve core spring 6 between the damping valve core 3 and the pilot pressure oil port, so that the damping valve core spring 6 can push the damping valve core 3 to move towards the fast-response damping hole 7 and abut against the fast-response damping hole 7. Thus, when the damping valve core 3 does not abut against the fast-response damping hole 7, the pilot pressure oil can first enter the pilot pressure chamber 41 and then enter the moving chamber 11 of the reversing valve through the fast-response damping hole 7 to drive the reversing valve core 2 to move. Until the damping valve core 3 abuts against the fast-response damping hole 7, the pilot pressure oil will directly flow into the moving chamber 11 of the reversing valve through the reversing damping hole 31 to drive the reversing valve core 2 to move until the oil circuit is switched. Among them, the diameter of the fast-response damping hole 7 is larger than that of the reversing damping hole 31. Thus, in the initial stage of oil circuit switching, the pilot pressure oil can quickly flow into the moving chamber 11 of the reversing valve through the larger-diameter fast-response damping hole 7, enabling the reversing valve core 2 to move quickly, thereby reducing the time taken for the reversing valve core 2 to pass through the dead zone and improving the response speed of the fast-response pilot segmented control mechanism. After passing through the dead zone, the pilot pressure oil will flow into the moving chamber 11 of the reversing valve from the smaller-diameter reversing damping hole 31. Thus, the smaller-diameter reversing damping hole 31 can play a good filtering role, improving the stability of the reversing valve core 1 during movement and facilitating the precise control of the movement amount of the reversing valve core 2, making the fast-response pilot segmented control mechanism have good stability and high control accuracy.

[0043] Further, in an embodiment of the fast-response pilot segmented control mechanism provided by the present invention, as Figure 2As shown, the housing 1 includes a main housing and pilot control end caps 4 at both ends. A pilot pressure chamber 41 is formed in each pilot control end cap 4. A pilot control end cap 4 is provided at each end of the valve shifting chamber 11, so that there is a pilot pressure oil port connected to each end of the valve shifting chamber 11, as well as the corresponding pilot pressure chamber 41, damping valve core 3 and damping valve core spring 6. The valve shifting chamber 11 can be arranged to extend all the way to the connection between the main housing and each pilot control end cap 4, so as to reduce the size of the main housing and thus reduce the manufacturing cost. Each valve shifting chamber 11 is adapted to accommodate the end of the valve spool 2 of the reversing valve and is respectively communicated with the corresponding pilot pressure chamber 41. A first oil outlet chamber A communicated with the first oil outlet, an oil inlet chamber P communicated with the oil inlet, and a second oil outlet chamber B communicated with the second oil outlet are sequentially formed in the main housing. The first oil outlet chamber A, the oil inlet chamber P and the second oil outlet chamber B are connected in series by the valve shifting chamber 11, and partition structures are provided between the first oil outlet chamber A and the oil inlet chamber P and between the oil inlet chamber P and the second oil outlet chamber B. The reversing valve spool 2 includes a first large-diameter section 22, a small-diameter section 23 and a second large-diameter section 24. When the first large-diameter section 22 and the second large-diameter section 24 are both in the corresponding partition structures, the oil in the oil inlet chamber P can be blocked, so that the oil will not flow to the first oil outlet chamber A and the second oil outlet chamber B. When the small-diameter section 23 moves to the first oil outlet chamber A, the oil in the oil inlet chamber P will enter the first oil outlet chamber A to supply oil to the first oil outlet. When the small-diameter section 23 moves to the second oil outlet chamber B, the oil in the oil inlet chamber P will enter the second oil outlet chamber B to supply oil to the second oil outlet.

[0044] Further, in an embodiment of the fast-response pilot segmented control mechanism provided by the present invention, as Figure 2As shown, the damping spool spring 6 at the first pilot pressure oil port PK1 is pre-compressed between the first pilot pressure oil port PK1 and the corresponding damping spool 3, so as to be able to apply a thrust force to the damping spool 3, enabling the damping spool 3 to move towards the corresponding quick-response damping hole 7 and abut against the quick-response damping hole 7, thereby realizing the blocking of the quick-response damping hole 7, so that the oil flow can be switched from flowing into the valve moving chamber 11 through the quick-response damping hole 7 to flowing into the valve moving chamber 11 through the commutation damping hole 31. Thus, it can be ensured that after the valve spool 2 of the commutation valve quickly passes through the dead zone, the valve moving chamber 11 can be supplied with oil through the commutation damping hole 31 with a smaller diameter, so as to achieve good filtering through the commutation damping hole 31 with a smaller diameter, thereby ensuring the stability of the subsequent movement of the valve spool 2 of the commutation valve, and facilitating the accurate control of the movement amount of the valve spool 2 of the commutation valve; similarly, the damping spool spring 6 at the second pilot pressure oil port PK2 is pre-compressed between the second pilot pressure oil port PK2 and the corresponding damping spool 3, so as to be able to apply a thrust force to the damping spool 3, enabling the damping spool 3 to move towards the direction of the corresponding quick-response damping hole 7 and abut against the quick-response damping hole 7, thereby realizing the blocking of the quick-response damping hole 7, so that the oil flow can be switched from flowing into the valve moving chamber 11 through the quick-response damping hole 7 to flowing into the valve moving chamber 11 through the commutation damping hole 31. Thus, it can be ensured that after the valve spool 2 of the commutation valve quickly passes through the dead zone, the valve moving chamber 11 can be supplied with oil through the commutation damping hole 31 with a smaller diameter, so as to achieve good filtering through the commutation damping hole 31 with a smaller diameter, thereby ensuring the stability of the subsequent movement of the valve spool 2 of the commutation valve, and facilitating the accurate control of the movement amount of the valve spool 2 of the commutation valve.

[0045] Specifically, in an embodiment of the quick-response pilot segmented control mechanism provided by the present invention, as Figure 4As shown, an oil passage 32 is provided inside the damping spool 3. A quick response pipeline 33 communicating with the oil passage 32 is provided on the side of the damping spool 3. A commutation damping hole 31 communicating with the oil passage 32 is provided at one end of the damping spool 3 near the quick response damping hole 7. The diameter of the damping spool 3 should be set to be smaller than the diameter of the pilot pressure chamber 41, so as to ensure that the pilot pressure oil can first flow into the pilot pressure chamber 41 through the oil passage 32 and the quick response pipeline 33, and then flow into the commutation valve moving chamber 11 through the quick response damping hole 7, so as to realize quick oil supply from the quick response damping hole 7 to the commutation valve moving chamber 11, and improve the moving speed of the commutation valve spool 2; A seal (the cover seal should ensure that the commutation damping hole 31 is not blocked) can be provided at one end of the damping spool 3 where the commutation damping hole 31 is located. When the damping spool spring 6 abuts the damping spool 3 against the quick response damping hole 7, a good seal can be formed between the damping spool 3 and the quick response damping hole 7 by the seal, ensuring that the pilot pressure oil can only flow from the damping spool 3 to the commutation valve moving chamber 11. Thus, the damping spool 3 can limit the flow and filter the pilot pressure oil, making the movement of the commutation valve spool 2 more stable and smooth, and the movement speed is relatively slow, which is convenient for controlling the movement amount of the commutation valve spool 2, and thus can more accurately control the output flow rate of the oil inlet chamber P to the first oil outlet chamber A or the second oil outlet chamber B.

[0046] Specifically, in an embodiment of the quick response pilot segmented control mechanism provided by the present invention, taking the side where the first pilot pressure oil port PK1 is located as an example, as Figure 2 shown, when the damping spool 3 is in the first state position, the damping spool 3 is away from the corresponding quick response damping hole 7, and the valve core thimble 21 abuts against the commutation damping hole 31, closing the commutation damping hole 31. The pilot pressure oil sequentially flows into the pilot pressure chamber 41 through the oil passage 32 and the quick response pipeline 33, and flows into the commutation valve moving chamber 11 through the quick response damping hole 7; as Figure 3 shown, when the damping spool 3 is in the second state position, the damping spool 3 abuts against the corresponding quick response damping hole 7, closing the quick response damping hole 7. The pilot pressure oil sequentially flows into the commutation valve moving chamber 11 through the oil passage 32 and the commutation damping hole 31.

[0047] Furthermore, in an embodiment of the quick response pilot segmented control mechanism provided by the present invention, as Figure 2 and Figure 3As shown, an oil drain damping chamber L is also provided in the main housing. The oil drain damping chamber L is communicated with the reversing valve moving chamber 11 through an oil drain damping pipeline 5. An oil drain damping member 51 is provided in the oil drain damping pipeline 5, and an oil drain damping hole 511 is provided on the oil drain damping member 51. The setting of the oil drain damping chamber L enables part of the pilot pressure oil to flow into the oil drain damping chamber L through the oil drain damping pipeline 5 when the pilot pressure oil flows into the reversing valve moving chamber 11 through the reversing damping hole 31. And when the pilot pressure oil passes through the oil drain damping pipeline 5, it will be subjected to the damping effect of the oil drain damping hole 511. Therefore, both the oil drain damping hole 511 and the reversing damping hole 31 will divide the pressure of the entire pilot pressure oil. Therefore, in order to control the pressure received by the reversing valve spool 2, the ratio of the diameters of the oil drain damping hole 511 and the reversing damping hole 31 can be adjusted. Specifically, the oil drain damping member 51 can be detachably installed in the oil drain damping pipeline 5, for example, screwed in the oil drain damping pipeline 5 for easy disassembly and replacement. The oil drain damping member 51 can be set as a set of oil drain damping member kits. The oil drain damping member kits include various models of oil drain damping members 51. The outer diameters of the respective oil drain damping members 51 are the same, but the diameters of the oil drain damping holes 511 in the respective oil drain damping members 51 are different, so that different ratios of the diameter of the oil drain damping hole 511 to the diameter of the reversing damping hole 31 can be formed, so as to be able to adjust different pilot pressures for the reversing valve spool 2, and thus some large parts (such as the damping spool spring 6 and the pilot control end cover 4, etc.) do not need to be replaced during the adjustment process, so as to ensure the generalization rate of large parts and save costs; of course, it can be understood that a design similar to the oil drain damping member 51 can also be adopted at the reversing damping hole 31 on the damping spool 3, that is, the oil passage 32 of the damping spool 3 directly extends to the end of the damping spool 3, and an oil passage damping member detachably connected to the oil passage 32 is provided on the oil passage 32, and a reversing damping hole 31 is provided on the oil passage damping member, and the oil passage damping member can be set as a set of oil passage damping member kits, and the diameters of the reversing damping holes 31 on the respective oil passage damping members in the kits are inconsistent, so as to be able to match different oil drain damping members 51 to form different pilot pressures for the reversing valve spool 2.

[0048] Furthermore, in an embodiment of the fast-response pilot segmented control mechanism provided by the present invention, as Figure 2As shown, a first large-diameter section oil passage groove 221 is provided at a portion of the first large-diameter section 22 in contact with the small-diameter section 23, and a second large-diameter section oil passage groove 241 is provided at a portion of the second large-diameter section 24 in contact with the small-diameter section 23. The design of the first large-diameter section oil passage groove 221 and the second large-diameter section oil passage groove 241 can ensure that while the partition structure between the oil inlet chamber P and the first oil outlet chamber A and the second oil outlet chamber B has sufficient thickness, the length of the dead zone can be reduced, thereby shortening the time when the reversing valve spool 2 passes through the dead zone, so as to improve the response speed of the fast-response pilot segmented control mechanism. Among them, when the end face of the end of the first large-diameter section 22 in contact with the small-diameter section 23 is flush with the side wall of the oil inlet chamber P close to the first oil outlet chamber A, the distance between the end of the first large-diameter section oil passage groove 221 close to the first oil outlet chamber A and the side wall of the first oil outlet chamber A close to the oil inlet chamber P is defined as the first dead zone distance L3. At this time, the distance between the abutting portion of the damping spool 3 in the second pilot pressure oil port PK2 in contact with the corresponding fast-response damping hole 7 and the fast-response damping hole 7 is defined as the first fast-response distance. When the end face of the end of the second large-diameter section 24 in contact with the small-diameter section 23 is flush with the side wall of the oil inlet chamber P close to the second oil outlet chamber B, the distance between the end of the second large-diameter section oil passage groove 241 close to the first oil outlet chamber A and the side wall of the first oil outlet chamber A close to the oil inlet chamber P is defined as the second dead zone distance L4. At this time, the distance between the abutting portion of the damping spool 3 in the first pilot pressure oil port PK1 in contact with the corresponding fast-response damping hole 7 and the fast-response damping hole 7 is the second fast-response distance L1. It can be understood that the first fast-response distance can preferably be set to be equal to the first dead zone distance L3, and the second fast-response distance L1 can be set to be equal to the second dead zone distance L4, so as to ensure that when the reversing valve spool 2 just passes through the dead zone, the corresponding damping spool 3 can just abut against the corresponding fast-response damping hole 7, so as to ensure that after the reversing valve spool 2 just passes through the dead zone, the oil supply from the fast-response damping hole 7 to the corresponding reversing valve moving chamber 11 is switched to the oil supply from the reversing damping hole 31 to the reversing valve moving chamber 11, thereby ensuring the stability of the movement after passing through the dead zone.

[0049] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present invention and all fall within the protection scope of the present invention.

Claims

1. A fast-response pilot segmented control mechanism, comprising a housing (1) and a valve structure disposed within the housing (1). The housing (1) includes a first pilot pressure oil port (PK1) for external connection, a first oil outlet, a second oil outlet, an oil inlet, and a second pilot pressure oil port (PK2), characterized in that, Pilot pressure chambers (41) are formed at both the first pilot pressure oil port (PK1) and the second pilot pressure oil port (PK2), and a directional valve moving chamber (11) is formed in the housing (1); the valve structure includes a damping valve core (3), a damping valve core spring (6) disposed in the pilot pressure chamber (41), and a directional valve core (2) disposed in the directional valve moving chamber (11). The pilot pressure chamber (41) communicates with the directional valve moving chamber (11) via a quick-response damping hole (7). A commutation damping hole (31) is provided on the damping valve core (3), and a valve core thimble (21) capable of abutting against the damping valve core (3) is provided on the end face of the directional valve core (2). The diameter of the quick-response damping hole (7) is larger than the diameter of the commutation damping hole (31), so that the pilot pressure oil in the pilot pressure chamber (41) can flow into the directional valve moving chamber (11) via the quick-response damping hole (7) or the commutation damping hole (31) during the working state; The damping valve core spring (6) at the first pilot pressure oil port (PK1) is pre-compressed between the first pilot pressure oil port (PK1) and the corresponding damping valve core (3) to be able to apply a thrust to the damping valve core (3), so that the damping valve core (3) can move towards the corresponding quick-response damping hole (7) and abut against the quick-response damping hole (7); the damping valve core spring (6) at the second pilot pressure oil port (PK2) is pre-compressed between the second pilot pressure oil port (PK2) and the corresponding damping valve core (3) to be able to apply a thrust to the damping valve core (3), so that the damping valve core (3) can move towards the direction of the corresponding quick-response damping hole (7) and abut against the quick-response damping hole (7); An oil passage (32) is provided inside the damping valve core (3), a quick-response pipeline (33) communicating with the oil passage (32) is provided on the side surface of the damping valve core (3), and the commutation damping hole (31) communicating with the oil passage (32) is provided at one end of the damping valve core (3) close to the quick-response damping hole (7).

2. The quick response pilot segmented control mechanism according to claim 1, wherein The housing (1) includes a main housing and pilot control end caps (4) at both ends. The pilot pressure chambers (41) are formed in each of the pilot control end caps (4); a directional valve moving chamber (11) is formed at the connection between the main housing and each of the pilot control end caps (4). Each of the directional valve moving chambers (11) is adapted to accommodate the end of the directional valve core (2) and is respectively communicated with the corresponding pilot pressure chamber (41); a first oil outlet chamber (A) communicating with the first oil outlet, an oil inlet chamber (P) communicating with the oil inlet, and a second oil outlet chamber (B) communicating with the second oil outlet are sequentially formed in the main housing.

3. The quick-response pilot segmented control mechanism according to claim 2, characterized in that, When the damping valve core (3) is in the first state position, the damping valve core (3) is away from the corresponding quick-response damping hole (7), and the valve core thimble (21) abuts against the commutation damping hole (31), closing the commutation damping hole (31). The pilot pressure oil sequentially flows into the pilot pressure chamber (41) through the oil passage (32) and the quick-response pipeline (33), and flows into the directional valve moving chamber (11) through the quick-response damping hole (7). When the damping valve core (3) is in the second state position, the damping valve core (3) abuts against the corresponding quick-response damping hole (7), closing the quick-response damping hole (7). The pilot pressure oil sequentially flows into the directional valve moving chamber (11) through the oil passage (32) and the commutation damping hole (31).

4. The quick response pilot segmented control mechanism according to claim 3, wherein, A drain damping chamber (L) is further provided in the main housing. The drain damping chamber (L) is communicated with the directional valve moving chamber (11) through a drain damping pipeline (5). A drain damping member (51) is provided in the drain damping pipeline (5), and a drain damping hole (511) is provided on the drain damping member (51).

5. The quick response pilot segmented control mechanism according to claim 4, characterized in that, The drain damping member (51) is detachably installed in the drain damping pipeline (5).

6. The quick-response pilot sectional control mechanism according to claim 2, wherein The directional valve core (2) includes a first large-diameter section (22), a small-diameter section (23), and a second large-diameter section (24). When the small-diameter section (23) moves to the first oil outlet chamber (A), the oil in the oil inlet chamber (P) enters the first oil outlet chamber (A). When the small-diameter section (23) moves to the second oil outlet chamber (B), the oil in the oil inlet chamber (P) enters the second oil outlet chamber (B).

7. The quick-response pilot segmented control mechanism according to claim 6, wherein, A first large-diameter section oil groove (221) is provided at a portion of the first large-diameter section (22) in contact with the small-diameter section (23), and a second large-diameter section oil groove (241) is provided at a portion of the second large-diameter section (24) in contact with the small-diameter section (23); when an end face of the end of the first large-diameter section (22) in contact with the small-diameter section (23) is flush with a side wall of the oil inlet chamber (P) close to the first oil outlet chamber (A), a distance between an end portion of the first large-diameter section oil groove (221) close to the first oil outlet chamber (A) and a side wall of the first oil outlet chamber (A) close to the oil inlet chamber (P) is a first dead zone distance (L3), and a distance between a contact portion of the damping valve core (3) in the second pilot pressure oil port (PK2) in contact with the corresponding quick response damping hole (7) and the quick response damping hole (7) is a first quick response distance; when an end face of the end of the second large-diameter section (24) in contact with the small-diameter section (23) is flush with a side wall of the oil inlet chamber (P) close to the second oil outlet chamber (B), a distance between an end portion of the second large-diameter section oil groove (241) close to the first oil outlet chamber (A) and a side wall of the first oil outlet chamber (A) close to the oil inlet chamber (P) is a second dead zone distance (L4), and a distance between a contact portion of the damping valve core (3) in the first pilot pressure oil port (PK1) in contact with the corresponding quick response damping hole (7) and the quick response damping hole (7) is a second quick response distance (L1).

8. The fast response pilot segmented control mechanism according to claim 7, wherein, The first quick response distance is equal to the first dead zone distance (L3), and the second quick response distance (L1) is equal to the second dead zone distance (L4).

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