Double-pump confluence load-sensitive valve group and multi-way valve for engineering machinery

Abstract

The utility model discloses a dual-pump confluence load-sensitive valve group and a multi-way valve for engineering machinery, and provides a modular integrated design, the valve group comprises an oil inlet valve plate I, a confluence valve plate, a reversing valve plate and an oil inlet valve plate II, the oil inlet valve plate I is integrated with a priority valve core and an overflow valve; oil return through a short path of the flow combining valve plate during middle-position unloading of the first oil pump is achieved; a three-way flow adjusting valve is arranged in the second oil inlet valve plate and is in linkage with the shuttle valve through an LS2 / LS3 channel, and the oil supply state and the unloading state of the second oil pump are dynamically switched. The converging valve plate controls double-pump converging logic through the reversing valve rod, P1 and P2 converge to a working port A through a logic one-way valve under the lifting working condition, meanwhile, an LS2 channel feeds back load pressure to trigger a three-way valve to be closed and unloaded, and rapid large-flow response is achieved. An unloading oil way structure is optimized, a pressure loss path is shortened, flow requirements are accurately matched in combination with load sensitive control, middle-position unloading energy consumption is reduced, the problems of energy waste and response lag of a traditional system are solved, the energy efficiency of equipment is remarkably improved, and the service life of the equipment is remarkably prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of multiway valve, concretely relates to a kind of load-sensitive valve group and multiway valve for engineering machinery of double pump confluence. BACKGROUND

[0002] Traditional open-center multiway valve group has long existed structural design redundancy and energy waste problem in hydraulic system. Its unloading oil circuit usually adopts single long path oil return design, for example, when unloading in the middle position, it needs to flow through multiple valve pieces and complex oil passages in turn, which leads to significant increase in pressure loss, especially when double pumps (P1, P2) are unloading simultaneously, energy loss is further intensified. In addition, to meet the needs of different working conditions, the traditional valve group often uses multiple valve cores in parallel or series configuration, for example, large flow action needs to increase additional confluence valve group, and small flow control needs independent adjustment unit. This "one-size-fits-all" design not only occupies the installation space of host machine, but also leads to system response lag due to poor coordination between valve cores, which is difficult to meet the needs of engineering machinery for rapid start and stop and dynamic load switching. According to statistics, the energy loss of such system when unloading in the middle position accounts for 15%-20% of the total power, which seriously restricts the improvement of equipment energy efficiency.

[0003] The flow and pressure control of traditional multiway valve group depends on external regulating valve or fixed throttle design, which lacks dynamic adaptability. For example, when double pumps confluence, manual or mechanical linkage switching is needed, which leads to oil supply delay and flow fluctuation, and cannot accurately match the instantaneous large flow demand of lifting working condition. Load-sensitive control is usually realized through external pressure compensation valve, which has slow response speed, low adjustment precision, and is easy to cause pressure oscillation or underload problem. More importantly, to consider different actuators (such as steering and lifting), the conventional valve group often uses "full flow through" design, that is, all actions depend on the same main oil circuit, which leads to a large amount of hydraulic energy being wasted when small flow is operated, and the system generates a lot of heat. These problems not only reduce the reliability of equipment, but also accelerate the wear of seals and valve cores due to frequent overload and pressure impact, significantly shortening the service life of hydraulic components. SUMMARY

[0004] The utility model aims at providing a kind of load-sensitive valve group and multiway valve for engineering machinery of double pump confluence, to overcome the defects of prior art, solve the problems of long unloading path, high energy loss, insufficient dynamic response and poor compatibility of traditional multiway valve group.

[0005] To this end, the utility model provides a kind of for the load-sensitive valve group and multiway valve of double pump confluence of engineering machinery, including the oil inlet valve piece one, confluence valve piece, multiple reversing valve piece and oil inlet valve piece two connected in turn;The oil inlet valve piece one is integrated with priority valve core, main spillway and steering spillway, its inside P1 passageway is directly communicated with the unloading oil circuit of confluence valve piece and return oil port T, the built-in three-way flow regulating valve of oil inlet valve piece two, and its unloading oil circuit is directly communicated T1 return oil port by three-way flow regulating valve;The confluence valve piece is equipped with reversing valve stem, logic one-way valve and LS2 passageway;

[0006] The reversing valve piece is linked with confluence valve piece, and the confluence or independent oil supply of oil pump one and oil pump two is controlled by reversing valve stem, wherein oil pump one and oil pump two are combined to work port A through logic one-way valve in lifting condition;The LS2 passageway is linked with three-way flow regulating valve to realize load-sensitive control.

[0007] As a preferred technical solution of the present application, the mid-position unloading path of oil pump one is: P1 oil inlet port→priority valve core→P1 oil channel of confluence valve piece→return oil port T.

[0008] As a preferred technical solution of the present application, the oil inlet valve piece two is equipped with LS2 passageway and LS3 passageway, and the actuator pressure is selected and transmitted to the spring cavity of three-way flow regulating valve through shuttle valve, to dynamically adjust the oil supply and unloading switching of oil pump two.

[0009] As a preferred technical solution of the present application, overflow valve one and overflow valve two are installed at the corresponding LS2 passageway and LS3 passageway, and the LS2 passageway and LS3 passageway are connected through shuttle valve.

[0010] As a preferred technical solution of the present application, the unloading oil circuit of confluence valve piece includes independently arranged P1 oil channel and P2 oil channel, and oil pump one and oil pump two are returned through P1 oil channel and three-way flow regulating valve respectively in mid-position unloading, so that the unloading path length is shortened compared with traditional valve group.

[0011] As a preferred technical solution of the present application, the logic one-way valve is communicated with P1 oil channel and work port A in lifting condition, and the load pressure is fed back to three-way flow regulating valve through LS2 passageway, to trigger oil pump two to stop unloading and combine with oil pump one to supply oil.

[0012] As a preferred technical solution of the present application, the confluence valve piece is equipped with electromagnetic valve to control the opening and closing of logic one-way valve, and the electromagnetic valve is opened to make work port A communicated with return oil port T in lowering condition, and oil pump one is unloaded through P1 oil channel, and oil pump two is unloaded through three-way flow regulating valve.

[0013] As a preferred technical solution of the present application, the confluence valve piece is equipped with electromagnetic valve oil channel, and electromagnetic valve oil channel and return oil port T are controlled by reversing valve stem.

[0014] As a preferred technical solution of the present application, when the reversing valve rod is in the lifting position, the electromagnetic valve is powered on, the oil channels of the first oil pump and the second oil pump are combined through the logical one-way valve to flow to the working port A, and the LS2 channel pressure drives the three-way flow regulating valve to close the unloading.

[0015] As a preferred technical solution of the present application, when the reversing valve rod is in the lifting position, the electromagnetic valve is powered on, the working port A is communicated with the oil return port T, the first oil pump is unloaded through the reversing valve piece, and the second oil pump is unloaded through the three-way flow regulating valve.

[0016] The load-sensitive valve group and the multi-way valve for the double-pump combination of the engineering machinery have the following beneficial effects:

[0017] 1) High efficiency and energy saving: The unloading oil way design is optimized, the oil way path is shortened, the pressure loss is significantly reduced, the energy consumption of the middle unloading is reduced from 15%-20% of the total power of the traditional system to 5%-8%, and the invalid energy dissipation is reduced.

[0018] 2) Fast dynamic response: The three-way flow regulating valve and the load-sensitive control are integrated, the load pressure is fed back in real time through the LS channel, the flow dynamic matching is realized, the instantaneous large flow demand of the lifting and lowering working conditions is accurately met, and the oil supply delay and fluctuation are avoided.

[0019] 3) Compact structure: The oil inlet valve piece, the combination valve piece and the reversing valve piece are modularly integrated, the large / small flow oil supply paths are separated, the redundant valve core and the oil channel are reduced, the main machine installation space is saved, and the manufacturing cost is reduced.

[0020] 4) Intelligent cooperation of double pumps: The double-pump combination logic is controlled through the reversing valve rod and the logical one-way valve, the oil supply is combined quickly in the lifting condition, the oil supply is independent in the non-combination condition, and the large flow action and the small flow fine control demand are considered.

[0021] 5) System reliability is improved: The load-sensitive control reduces the pressure oscillation and impact, the short-path unloading reduces the system heating, the sealing element and the valve core wear are delayed, and the service life of the hydraulic element is prolonged.

[0022] 6) Multifunctional adaptability: The oil inlet valve piece one integrates the steering priority function, the oil inlet valve piece two supports the dynamic unloading switching, the complex working condition demand of the multiple actuators (steering, lifting and lowering) of the engineering machinery is met, and the operation stability is significantly enhanced.

[0023] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings accompanying the specification of this application serve to provide further understanding of the present application, the illustrative embodiments of the present application and their descriptions serve to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figures la-c Front view and left and right side views of the load-sensitive valve group and the multi-way valve for the double-pump confluence of the engineering machinery of the utility model;

[0026] Figure 2 Principle diagram of the load-sensitive valve group and the multi-way valve for the double-pump confluence of the engineering machinery of the utility model;

[0027] Figure 3 Structural schematic diagram of the first oil inlet valve piece in the load-sensitive valve group and the multi-way valve for the double-pump confluence of the engineering machinery of the utility model;

[0028] Figure 4 Structural schematic diagram of the second oil inlet valve piece in the load-sensitive valve group and the multi-way valve for the double-pump confluence of the engineering machinery of the utility model;

[0029] Figure 5 Structural schematic diagram of the confluence valve piece in the load-sensitive valve group and the multi-way valve for the double-pump confluence of the engineering machinery of the utility model in the middle position state;

[0030] Figure 6 Structural schematic diagram of the confluence valve piece in the load-sensitive valve group and the multi-way valve for the double-pump confluence of the engineering machinery of the utility model in the lifting position;

[0031] Figure 7 Structural schematic diagram of the confluence valve piece in the load-sensitive valve group and the multi-way valve for the double-pump confluence of the engineering machinery of the utility model in the lowering position;

[0032] BRIEF DESCRIPTION OF DRAWINGS: 1. First oil inlet valve piece; 2. Second oil inlet valve piece; 3. Three-way flow regulating valve; 4. Priority valve core; 5. Confluence valve piece; 6. Reversing valve piece; 7. Reversing valve rod; 8. Electromagnetic valve oil passage; 9. Logic one-way valve; 10. Electromagnetic valve; 11. P1 oil passage; 12. P2 oil passage; 13. LS2 channel; 14. Main overflow valve; 15. Steering overflow valve; 16. Overflow valve one; 17. Overflow valve two. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] As Figures la-c , and Figures 2-7As shown, the utility model discloses a load sensitive valve group and multiway valve for double pump confluence of engineering machinery, including from left to right in proper order the oil inlet valve piece one 1, the confluence valve piece 5, multiple reversing valve pieces 6 and the oil inlet valve piece two 2, the reversing valve piece 6 is linked with the confluence valve piece 5, and the confluence or independent oil supply of oil pump one P1 and oil pump two P2 is controlled through reversing valve stem 7, wherein oil pump one P1 and oil pump two P2 are confluenced to the working port A through logic one-way valve 9 under the lifting condition, the confluence valve piece 5 is provided with LS2 channel 13, is used for the opening and closing of the three-way flow regulating valve 3 linkage, realizes load sensitive control.

[0035] The oil inlet valve piece two 2 integrates the three-way flow regulating valve 3, and the spring cavity of the three-way flow regulating valve 3 is communicated with the working port A or the oil return port T through the LS2 channel or the LS3 channel, for dynamically adjusting the unloading and oil supply switching of the oil pump two P2.

[0036] Specifically, as shown, Figure 3 The oil inlet valve piece one 1 integrates the priority valve core 4, the steering overflow valve 15 and the main overflow valve 14, has the steering priority function, and the oil inlet valve piece one 1 also has the P1 oil channel communicated with the confluence valve piece 5 and the P1 oil inlet communicated with the oil pump one, the oil liquid of the oil inlet valve piece one 1 is directly communicated with the oil return port T through the unloading oil path of the confluence valve piece 5, for the mid unloading of the oil pump one P1.

[0037] The oil liquid of the oil pump one P1 is communicated with the oil inlet P1 of the oil inlet valve piece one 1, is unloading after the priority valve core 4 is opened, is flowed to the oil return port T through the P1 oil channel of the oil inlet valve piece one 1 and the P1 oil channel 11 of the confluence valve piece 5, realizes unloading.

[0038] As shown, Figure 4 The oil inlet valve piece two 2 is provided with the P2 oil inlet, the T1 oil return port, the LS2 channel and the LS3 channel, and the P2 oil inlet is communicated with the oil pump two, the T1 oil return port is communicated with the oil tank, the overflow valve one 16 and the overflow valve two 17 are installed correspondingly between the LS2 channel and the LS3 channel, and the LS2 channel and the LS3 channel are connected through the shuttle valve.

[0039] The unloading oil path of the oil inlet valve piece two 2 is directly communicated with the T1 oil return port through the three-way flow regulating valve 3, for the mid unloading of the oil pump two P2.

[0040] When the mechanical equipment does not work, the oil inlet valve piece two 2 is in the mid position, the oil pump two P2 is opened through the three-way flow regulating valve 3 through the P2 oil port of the oil inlet valve piece two 2, and the oil liquid is flowed back to the oil tank through the oil return channel T and the oil return port T of the confluence valve piece 5.

[0041] When the mechanical equipment works, the oil inlet valve piece two is in the working position, the pressure is transmitted to the three-way flow regulating valve 3 through the LS2 channel or the LS3 channel by the shuttle valve, at this time, the three-way flow regulating valve 3 adjusts the required flow according to the actuator pressure, and the excess oil is returned to the tank through the oil return channel T.

[0042] As shown in Figure 5 The combined valve piece 5 is provided with a reversing valve rod 7, an electromagnetic valve 10 and a logic one-way valve 9, and is further provided with an electromagnetic valve oil channel 8, a P1 oil channel 11, a P2 oil channel 12, an LS2 channel 13, an oil return port T and an A working port; the A working port is communicated with the P1 oil channel 11 through the logic one-way valve 9 and controls the on-off; the electromagnetic valve oil channel 8 is communicated with the oil return port T through the reversing valve rod 7 and controls the on-off; the LS2 channel 13 of the combined valve piece 5 is located on the inner side of the P1 oil channel 11 and is communicated with the LS2 channel of the oil inlet valve piece two 2, and is used for linkage opening and closing of the three-way flow regulating valve 3, so as to realize the load sensitive control.

[0043] The working principle and working process of the double-pump combined load sensitive valve group and the multi-way valve for engineering machinery are briefly described below.

[0044] As shown in Figure 5 The reversing valve rod 7 is in the middle position: when the mechanical equipment does not work, the electromagnetic valve 10 is not powered and is in the normally closed state, and the electromagnetic valve oil channel is closed. The oil pump one P1 is unloaded through the oil inlet valve piece one 1, the priority valve core 4 and the P1 oil channel 11 of the combined valve piece 5 through the oil return port T; the oil pump two P2 is unloaded through the oil inlet valve piece two 2, the reversing valve piece 6 and the P2 oil channel 12 of the combined valve piece 5, at this time, the P2 oil channel of the combined valve piece 5 is closed, and the LS2 channel of the oil inlet valve piece two 2 is communicated with the oil return port T, so that the oil pump two P2 is unloaded through the three-way flow regulating valve 3 in the oil inlet valve piece two 2 and is returned to the tank through the T port of the combined valve piece 5, at this time, the oil pump one P1 and the oil pump two P2 are in the middle position and are unloaded. Compared with the conventional open center multi-way valve group, the unloading oil way is shorter, the pressure loss is lower, and the energy is more saved.

[0045] As shown in Figure 6 The reversing valve rod 7 is in the lifting position: when the mechanical equipment is in the lifting working condition, the electromagnetic valve is powered and becomes normally open from normally closed at this time; the oil pump one P1 is unloaded through the oil inlet valve piece one 1, the priority valve core 4 and the P1 oil channel 11 of the combined valve piece, at this time, the oil return channel T is closed, the P1 oil is controlled by the reversing valve rod 7 and is transmitted to the working port A through the internal oil channel of the combined valve piece and the logic one-way valve 9, and then is supplied to the lifting actuator through the pipeline, at this time, the LS2 channel 13 in the combined valve piece is communicated with the working port A, the pressure is the load pressure, and is transmitted to the spring cavity of the three-way flow regulating valve 3 in the oil inlet valve piece two 2 through the internal oil channel of the valve group, at this time, the three-way flow regulating valve 3 stops unloading.

[0046] The oil pump two P2 is connected to the P2 oil channel 12 through the oil inlet valve piece two 2 to the reversing valve piece to the converging valve piece, and is controlled by the reversing valve rod to converge with the P1 oil to the same oil channel, to complete the converging function of the double pump and achieve the purpose of rapid lifting.

[0047] As shown in Figure 7 the lowering position: when the machine is in the lowering working condition, the electromagnetic valve is powered on at this time, and the normally closed becomes normally open state, the electromagnetic valve channel is communicated with the oil return channel, and the logic one-way valve 9 is opened at this time. The oil of the actuator is communicated with the oil return channel through the working port A, and the actuator starts to descend.

[0048] The oil pump one P1 is connected to the converging valve piece inside the oil channel and the return port T through the converging valve piece, and continues to be unloaded; the oil pump two P2 is connected to the P2 oil channel 12 through the oil inlet valve piece two 2 to the reversing valve piece 6 to the converging valve piece 5, and at this time, the P2 oil channel is closed, the LS2 oil channel is communicated with the oil return channel T, and the oil pump two P2 is unloaded by the three-way flow regulating valve 3 in the oil inlet valve piece two 2, and is returned to the oil tank through the T port of the converging valve piece.

[0049] The converging valve piece of the first connection is integrated with the steering priority, and the oil inlet valve piece two is integrated with the three-way flow regulating valve, which uses two valve cores to control two variables respectively. Compared with the conventional open center multi-way valve group, the left oil inlet valve piece one is unloaded from the converging valve piece of the first connection, and the right oil inlet valve piece two is directly unloaded from the oil inlet side. The unloading oil way is shorter, the pressure loss is lower, and the energy is more saved, which can effectively reduce the energy waste.

[0050] The converging valve piece of the first connection requires large flow in the lifting working condition, and the left and right oil inlets are converged in the first connection after reversing to supply the lifting actuator; the flow required by the remaining actuators is relatively small, and the right oil inlet can meet the requirement. Combining large flow valve and small flow valve can meet different working conditions, save main machine installation volume, and save valve cost.

[0051] The three-way flow regulating valve built in the oil inlet valve piece two can adjust the flow and pressure in real time according to the system demand, keep the pressure stable, realize accurate load control, ensure the stable operation of the equipment under various working conditions, and avoid the occurrence of overload or underload. By accurately controlling the load, the load sensitive valve can help to reduce the wear and pressure fluctuation of the equipment, thereby prolonging the service life of the equipment.

[0052] This scheme solves the problems of high energy consumption, slow response and poor compatibility of traditional multi-way valve group through oil path optimization, converging logic innovation and intelligent flow regulation, has significant application value in the fields of engineering machinery and hoisting equipment, and is especially suitable for scenes requiring frequent start and stop and high precision load control, and has comprehensive energy efficiency improvement.

[0053] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery, characterized in that, It includes an oil inlet valve plate one (1), a confluence valve plate (5), multiple reversing valve plates (6) and an oil inlet valve plate two (2) connected in sequence; The first oil inlet valve (1) integrates a priority valve core (4), a main relief valve (14) and a directional relief valve (15). Its internal P1 channel is directly connected to the return port T of the unloading oil circuit of the confluence valve (5). The second oil inlet valve (2) has a built-in three-way flow regulating valve (3). Its unloading oil circuit is directly connected to the T1 return port through the three-way flow regulating valve (3). The confluence valve (5) is provided with a reversing valve stem (7), a logic check valve (9) and an LS2 channel (13). The reversing valve plate (6) is linked with the confluence valve plate (5) and controls the confluence or independent oil supply of oil pump one (P1) and oil pump two (P2) through the reversing valve rod (7). During the lifting operation, oil pump one (P1) and oil pump two (P2) are confluenced to the working port A through the logic check valve (9). The LS2 channel (13) is linked with the three-way flow regulating valve (3) to realize load-sensitive control.

2. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, The unloading path of oil pump 1 (P1) is: P1 inlet → priority valve core (4) → P1 oil passage (11) of the confluence valve plate (5) → return port T.

3. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, The oil inlet valve plate 2 (2) is provided with LS2 channel and LS3 channel. The actuator pressure is selected through the shuttle valve and transmitted to the spring cavity of the three-way flow regulating valve (3) to dynamically regulate the oil supply and unloading switching of the oil pump 2 (P2).

4. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, Overflow valve 1 (16) and overflow valve 2 (17) are installed at the LS2 and LS3 channels respectively; at the same time, the LS2 and LS3 channels are connected by a shuttle valve.

5. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, The unloading oil circuit of the confluence valve plate (5) includes independently set P1 oil passage (11) and P2 oil passage (12). When unloading in the middle position, oil pump one (P1) and oil pump two (P2) return oil through P1 oil passage (11) and three-way flow regulating valve (3) respectively. The unloading path length is shorter than that of traditional valve groups.

6. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, When the logic check valve (9) is in the lifting condition, it connects the P1 oil passage (11) and the working port A. At the same time, the LS2 channel (13) feeds back the load pressure to the three-way flow regulating valve (3), triggering the second oil pump (P2) to stop unloading and merge with the first oil pump (P1) to supply oil.

7. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, The merging valve plate (5) is equipped with a solenoid valve (10) to control the opening and closing of the logic check valve (9). When the descent condition is reached, the solenoid valve (10) opens to connect the working port A to the return port T. At the same time, oil pump one (P1) is unloaded through the P1 oil passage (11), and oil pump two (P2) is unloaded through the three-way flow regulating valve (3).

8. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, The merging valve plate (5) is provided with a solenoid valve oil passage (8), and the solenoid valve oil passage (8) and the return oil port T are controlled to be switched on and off by the reversing valve rod (7).

9. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, When the reversing valve stem is in the lifting position, the solenoid valve is energized and opened, and the oil passages of oil pump one (P1) and oil pump two (P2) merge into the working port (A) through the logic check valve, and the pressure of the LS2 channel drives the three-way flow regulating valve to close and unload.

10. The load-sensitive valve assembly and multi-way valve for dual-pump confluence in engineering machinery according to claim 1, characterized in that, When the reversing valve stem is in the lowered position, the solenoid valve is energized and opened, the working port (A) is connected to the return port (T), the oil pump one (P1) is unloaded through the reversing valve plate, and the oil pump two (P2) is unloaded through the three-way flow regulating valve.

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