A new logic compound control valve

Abstract

The utility model discloses a novel logic composite control valve passes through increasing the structure of logic control valve, and logic control valve can control main valve core, and the flow output of reversing valve can be controlled by pilot valve, because of the control of logic valve, can make main valve realize two kinds of working conditions, realize the flow distribution ratio of different each action, satisfy the working demand of wood -grabbing machine and excavator respectively. According to user use mode demand, can conveniently switch wood -grabbing machine working condition mode and excavating working condition mode, has improved the use frequency of walking machinery greatly, reduced the investment of user, realized one machine two uses.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically a novel logic composite control valve. Background Technology

[0002] An excavator is a heavy-duty earthmoving machine that uses a bucket to excavate materials (such as soil, coal, and silt) above or below the machine's bearing surface. Its main functions include excavation, loading, and crushing. A log grapple (also known as a log grabber) is a special type of engineering machinery modified from the front-end working device of an excavator. It is mainly used for grabbing, loading, unloading, and transporting materials such as timber, wood, and stones. The hydraulic main control valve is an essential hydraulic component in the hydraulic systems of both types of mobile machinery. It ensures the normal operation of the machinery, and the quality of the hydraulic control system directly affects the performance of both types of mobile machinery. If the hydraulic system cannot meet the normal operating requirements of the mobile machinery, it will greatly reduce the comfort of operation and reduce work efficiency. Therefore, the hydraulic control system plays a very important role in mobile machinery. The hydraulic system of mobile machinery mainly consists of a hydraulic main control pump, a hydraulic main control valve, a swing motor, and cylinders. The quality of the main control valve in the hydraulic system of mobile machinery directly affects the performance of the mechanical system. Due to the different operating conditions of excavators and log grapples, the output flow of the hydraulic main control valve to each working device is different. The flow distribution ratio of the main control valve to each working device is controlled by the pilot valve in the main control valve. Therefore, it is particularly important to develop a logic control valve that allows for easy switching between excavator and log grapple functions and has stable performance. The logic control valve can realize the switching between log grapple working mode and excavator working mode, enabling users to use one machine for two purposes. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a novel logic composite control valve.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A novel logic composite control valve includes a directional valve and a logic control valve. The main valve core of the directional valve is controlled by a first pilot valve and a second pilot valve. The first pilot valve is a dual-control valve, comprising a first end cap with one open end. The open end of the first end cap is connected to the main valve body of the directional valve via a flange. A first spring seat is disposed inside the first end cap. A first seat ring is disposed on the outer wall of the first spring seat near the main valve body. A first spring is disposed between the first seat ring and the inner end face of the first end cap. The main valve core is slidably inserted into the first spring seat. The first spring seat has a first pressure transmission hole communicating with the interior. The first end cap has a first pilot control port communicating with the interior. The first end cap has a logic control channel coinciding with the axis of the first spring seat. A limiting plunger is slidably disposed within the logic control channel. The opening of the logic control channel away from the first spring seat is a limiting control port, which communicates with the logic valve outlet of the logic control valve. The logic control valve has a first control position and a second control position.

[0006] Furthermore, the logic control valve includes a control valve body, the control valve body is provided with a control valve passage, the control valve passage is provided with a control valve core, and the control valve body is provided with a logic valve outlet, a logic valve second inlet, and a logic valve first inlet that are connected to the control valve passage through an oil passage.

[0007] Specifically, the control valve body is provided with a spring seat end cover at one end of the control valve passage, a control spring is provided between the spring seat end cover and the control valve core, and a control plug is provided at the end of the control valve passage away from the control spring, and the control plug is provided with a control oil port communicating with the control valve passage.

[0008] Specifically, when the control valve core is pushed against the control plug by the control spring, the logic control valve is in the first control position, and the oil outlet of the logic valve is connected to the first oil inlet of the logic valve. When the control oil port is pressurized, the control valve core compresses the control spring and moves to the second control position, and the oil outlet of the logic valve is connected to the second oil inlet of the logic valve.

[0009] Furthermore, a positioning ring is provided at one end of the logic control channel near the first spring, and the limiting plunger has a T-shaped structure. The limiting plunger cooperates with the logic control channel and passes through the positioning ring.

[0010] Furthermore, the second pilot valve includes a second end cap, one end of which is open. The open end of the second end cap is connected to the main valve body of the directional valve via a flange. A second spring seat is provided inside the second end cap. A second seat ring is provided at one end of the outer wall of the second spring seat near the main valve body. A second spring is provided between the second seat ring and the inner end face of the second end cap. The main valve core is slidably inserted into the second spring seat. The second spring seat is provided with a second pressure transmission hole communicating with the interior. The second end cap is provided with a second pilot control oil port communicating with the interior.

[0011] Furthermore, the reversing valve includes a three-position four-way reversing structure;

[0012] Specifically, the oil inlet passage of the three-position four-way reversing structure is equipped with a pressure compensation valve and a check valve;

[0013] Specifically, the first working port and the second working port of the three-position four-way reversing structure are respectively connected to the safety oil replenishment valve, and the second working port is connected to the load holding valve core.

[0014] Specifically, the three-position four-way reversing structure, pressure compensation valve, safety oil replenishment valve, and load holding valve are all located in the main valve body;

[0015] Specifically, the main valve core of the three-position four-way reversing structure is controlled by a logic control valve, a first pilot valve, and a second pilot valve.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention combines an excavator and a log grabber into one unit, switching between excavation and log grabbing functions via a logic control valve, significantly improving efficiency, comfort, and reliability.

[0018] This invention incorporates a logic control valve, which controls the main valve core and the pilot valve, which controls the flow output of the directional valve. Due to the logic valve's control, the main valve can operate in two states, achieving different flow distribution ratios for each action, thus meeting the operational needs of both the log grapple and the excavator. Based on user requirements, the system allows for easy switching between log grapple and excavator operating modes, significantly increasing the frequency of use of the mobile machinery, reducing user investment, and achieving dual-purpose functionality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a novel logic composite control valve according to this utility model.

[0020] Figure 2 This is a schematic diagram of the reversing valve in this utility model.

[0021] Figure 3This is a schematic diagram of the left-side liquid flow direction of the reversing valve in this utility model.

[0022] Figure 4 This is a schematic diagram of the right-side liquid flow direction of the reversing valve in this utility model.

[0023] Figure 5 This is a schematic diagram of the logic control valve in this utility model.

[0024] In the diagram: 1. Valve body; 2. Valve core; 3. Control plug; 4. Directional control valve; 5. Logic control valve; 6. Main valve core; 8. Limiting plunger; 11. First spring seat; 12. Second spring seat; 13. Load holding valve; 14. Pressure compensation valve; 15. Safety replenishing valve; 16. Check valve; 17. First spring; 18. Second spring; 19. Main valve body; 20. First end cap; 21. Second end cap;

[0025] 201. First novel logic composite control valve; 202. Second novel logic composite control valve; 41. First directional control valve; 42. Second directional control valve; 51. First logic control valve; 61. First main valve core; 62. Second main valve core; 81. First limit plunger; 82. Second limit plunger; 131. First load holding valve; 132. Second load holding valve; 141. Pressure compensation valve; 142. Pressure compensation valve; 141. First safety replenishing valve; 142. Second safety replenishing valve; 143. Third safety replenishing valve; 144. Fourth safety replenishing valve;

[0026] PA. Control port; XAb. First inlet port of the logic valve; DR. Second inlet port of the logic valve; BCS1. Outlet port of the logic valve; BCS2. Limit control port; BCA. Second limit control port; A1. First working port; B1. Second working port; A2. Third working port; B2. Fourth working port; a1. Second pilot control port; b1. First pilot control port;

[0027] P. Valve inlet; T. Valve return port; P0. Oil pump; T0. Oil tank; P1. First valve inlet; T1. First valve return port; P2. Second valve inlet; T2. Second valve return port. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1:

[0030] Please see Figures 1 to 5 This utility model provides a novel logic composite control valve, including a logic control valve 5 and a reversing valve 4. The main valve core 6 of the reversing valve 4 is controlled by a first pilot valve and a second pilot valve. The first pilot valve is a dual-control valve and includes a first end cover 20. One end of the first end cover 20 is open, and the open end of the first end cover 20 is connected to the main valve body 19 of the reversing valve 4 via a flange. A first spring seat 11 is provided inside the first end cover 20. A first seat ring is provided at the end of the outer wall of the first spring seat 11 near the main valve body 19. A first spring 17 is provided between the first seat ring and the inner end face of the first end cover 20. The main valve core 6 slides... The first spring seat 11 is inserted into the first spring seat 11. The first spring seat 11 is provided with a first pressure transmission hole communicating with the interior. The first end cover 20 is provided with a first pilot control oil port b1 communicating with the interior. The first end cover 20 is provided with a logic control channel that coincides with the axis of the first spring seat 11. A limiting plunger 8 is slidably provided in the logic control channel. The opening of the logic control channel away from the first spring seat 11 is a limiting control oil port BCS2. The limiting control oil port BCS2 is connected to the logic valve outlet BCS1 of the logic control valve 5. The logic control valve 5 is provided with a first control position and a second control position. The logic control valve 5 is provided with a hydraulic control structure and is controlled by hydraulic pressure.

[0031] In use, the directional valve 4 is controlled by two pilot valves. When it is necessary to restrict one working position of the directional valve 4, the pressure oil pushes out the limit plunger 8 through the logic control valve 5, which changes the movement limit point of each end of the main valve core 6, thereby changing the flow rate of the directional valve 4 in this working position.

[0032] Specifically, a positioning ring is provided at one end of the logic control channel near the first spring 17, and the limiting plunger 8 has a T-shaped structure. The limiting plunger 8 cooperates with the logic control channel and passes through the positioning ring, so that the limiting plunger 8 can be positioned on the positioning ring under pressure. The end face of the limiting plunger 8 near the first spring seat 11 can contact the first spring seat 11 to achieve limiting and change the extreme position of the main valve core 6.

[0033] Further, the logic control valve 5 includes a control valve body 1, which has a control valve passage and a control valve core 2. The control valve body 1 has a logic valve outlet BCS1, a logic valve second inlet DR, and a logic valve first inlet XAb connected to the control valve passage via an oil passage. The control valve body 1 has a spring seat end cap at one end of the control valve passage, and a control spring is provided between the spring seat end cap and the control valve core 2. The control valve body 1 has a control plug 3 at the end of the control valve passage away from the control spring, and the control plug 3 has a control oil port PA connected to the control valve passage. When the control valve core 2 is pushed against the control plug 3 by the control spring, the logic control valve 5 is in the first control position, and the logic valve outlet BCS1 is connected to the logic valve first inlet XAb. When the control oil port PA is pressurized, the control valve core 2 compresses the control spring and moves to the second control position, and the logic valve outlet BCS1 is connected to the logic valve second inlet DR.

[0034] Specifically, the control plug 3 is used for function switching, and the control oil port plug 3 is connected to the control valve body 1 by threads and sealed by a sealing ring.

[0035] Furthermore, the second pilot valve includes a second end cap 21, one end of which is open. The open end of the second end cap 21 is connected to the main valve body 19 of the reversing valve 4 via a flange. A second spring seat 12 is provided inside the second end cap 21. A second seat ring is provided at one end of the outer wall of the second spring seat 12 near the main valve body 19. A second spring 18 is provided between the second seat ring and the inner end face of the second end cap 21. The main valve core 6 is slidably inserted into the second spring seat 11. The second spring seat 12 is provided with a second pressure transmission hole communicating with the interior. The second end cap 20 is provided with a second pilot control oil port a1 communicating with the interior.

[0036] Furthermore, the reversing valve 4 includes a three-position four-way reversing structure. The oil inlet passage of the three-position four-way reversing structure is equipped with a pressure compensation valve 14 and a check valve 16. The first working oil port A1 and the second working oil port B1 of the three-position four-way reversing structure are respectively connected to the safety replenishing oil valve 15. The second working oil port B1 is connected to the load holding valve core 13. The three-position four-way reversing structure, the pressure compensation valve 14, the safety replenishing oil valve 15, and the load holding valve 13 are all located in the main valve body 19. The main valve core 6 of the three-position four-way reversing structure is controlled by the logic control valve 5, the first pilot valve, and the second pilot valve.

[0037] Specifically, when the three-position four-way reversing structure is in the left position, the valve inlet P is connected to the second working port B1, and the valve return port T is connected to the first working port A1; when the three-position four-way reversing structure is in the right position, the valve inlet P is connected to the first working port A1, and the valve return port T is connected to the second working port B1; the limiting plunger 8 restricts the flow rate of the three-position four-way reversing structure when it is in the right position.

[0038] Specifically, when the main valve core 6 is in the middle position of the three-position four-way reversing structure, the limiting plunger 8 does not contact the main valve core 6.

[0039] It should be noted that the three-position four-way reversing structure, pressure compensation valve 14, safety oil replenishment valve 15, and load holding valve 13 are existing technologies. Those skilled in the art, in conjunction with the information provided in this patent, will understand these technologies. Figure 1 , Figure 2 , Figure 3 , Figure 4 I know how to combine them, so I won't go into details.

[0040] Example 2:

[0041] In this embodiment, the novel logic composite control valve described in Embodiment 1 is applied to a digging and grabbing composite machine.

[0042] Currently, excavators and log grapples on the market use two separate hydraulic systems, meaning users cannot have both functions simultaneously. This invention utilizes a novel logic composite control valve to allow for flexible switching between the two mechanical control systems according to user needs, resulting in superior performance.

[0043] A novel logic composite control valve is applied to an excavator-grab composite machine, comprising a control valve assembly. The control valve assembly includes a first novel logic composite control valve 201, a second novel logic composite control valve, a third novel logic composite control valve, and a fourth novel logic composite control valve. The first valve inlet P1 of the first novel logic composite control valve 201 is connected to an oil pump P0, and the first valve return port T1 is connected to an oil tank T0. The second valve inlet P2 of the second novel logic composite control valve 202 is connected to the oil pump P0, and the second valve return port T2 is connected to the oil tank T0. The first safety replenishing valve 151 and the second safety replenishing valve 152 of the first novel logic composite control valve 201 are connected to the oil tank T0, and the third safety replenishing valve 153 and the fourth safety replenishing valve 154 of the second novel logic composite control valve 202 are also connected to the oil tank T0, for drawing oil from the oil tank T0 in the event of a cavitation effect.

[0044] The first working port A1 and the second working port B1 of the first reversing valve 41 are connected to the boom cylinder of the excavator or log grapple; the limit control port BCS2 is connected to the first new logic composite control valve 201.

[0045] The third working port A2 and the fourth working port B2 of the second directional valve 42 are connected to the boom cylinder of the excavator or log grabber; the second limit control port BCA in the figure is connected to the second new logic composite control valve (the second new logic composite control valve has the same structure as the first new logic composite control valve 201, so it is not shown in the figure).

[0046] The third directional valve is connected to the excavator's bucket cylinder, which is also connected to the log grapple's clamp cylinder. The third directional valve is connected to the third novel logic composite control valve. (The third directional valve has the same structure as the first directional valve, and the third novel logic composite control valve has the same structure as the first novel logic composite control valve 201, so it is not shown in the figure.)

[0047] The fourth directional valve is connected to the swing motor of the excavator or log grapple. The fourth directional valve is connected to the fourth new logic composite control valve (the fourth directional valve has the same structure as the first directional valve, and the fourth new logic composite control valve has the same structure as the first new logic composite control valve 201, so it is not shown in the figure).

[0048] The boom cylinder, stick cylinder, and swing motor are shared, and the machine's working attributes can be changed by replacing the bucket and clamps.

[0049] Because excavators and log grapples have different load ratios among their various working devices during operation—for example, when an excavator is working with its boom, stick, bucket, and swing making combined movements (such as digging and loading), while a log grappler is working with its boom, stick, clamp, and swing making combined movements (such as clamping logs and loading), the load ratios among them are different, and the required flow ratios are also different. Therefore, by switching logic valves, the required flow distribution ratios for the excavator and the log grappler can be achieved separately, thus realizing the purpose of one machine having multiple functions.

[0050] Taking the first directional valve 41 as an example: when there is no pressure oil at the control port PA, the logic valve is in the first control position, which is the working mode of the log grabber. The limit position of the main valve core 6 is changed through the first oil inlet XAb of the logic valve. When the log grabber performs compound actions, the hydraulic oil of the main pump enters the valve inlet P, and enters the first working oil port A1 and the third working oil port A2 simultaneously through different directional valves. The flow rate is reasonably distributed by the logic valve and the pilot valve to ensure that the log grabber's actions are coordinated and efficient.

[0051] When there is pressurized oil at the control port PA, the logic valve is in the second control position. The limit position of the main valve core 6 is changed through the second inlet port Dr of the logic valve. The pressure at the outlet port BCS1 of the logic valve is limited by the pressure at the control port PA. When the excavator performs compound actions, the hydraulic oil of the main pump enters the valve inlet P, and enters different working ports simultaneously through different directional valves. The flow rate is reasonably distributed by the logic valve and the pilot valve to ensure that the excavator's actions are coordinated and efficient.

[0052] The use of logic valves is not limited to the above applications. Depending on the system requirements, they can be used for composite control of one or more priority quantities. At the same time, the control mode can be switched between manual, hydraulic control, electric control and other modes.

[0053] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0054] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel logic composite control valve, comprising a directional valve, characterized in that, It also includes logic control valves; The main valve core of the reversing valve is controlled by the first pilot valve and the second pilot valve. The first pilot valve is a dual-control valve. The first pilot valve includes a first end cover with an opening at one end. The open end of the first end cover is connected to the main valve body of the reversing valve. A first spring seat is provided inside the first end cover. A first seat ring is provided at one end of the outer wall of the first spring seat near the main valve body. A first spring is provided between the first seat ring and the inner end face of the first end cover. The main valve core is slidably inserted into the first spring seat. The first spring seat is provided with a first pressure transmission hole communicating with the interior. The first end cover is provided with a first pilot control oil port communicating with the interior. The first end cap is provided with a logic control channel that coincides with the axis of the first spring seat. A limiting plunger is slidably provided in the logic control channel. The opening of the logic control channel away from the first spring seat is a limiting control oil port. The limiting control oil port is connected to the logic valve outlet of the logic control valve. The logic control valve is provided with a first control position and a second control position.

2. The novel logic composite control valve according to claim 1, characterized in that, The logic control valve includes a control valve body, a control valve passage, a control valve core, and a logic valve outlet, a logic valve second inlet, and a logic valve first inlet connected to the control valve passage via an oil passage. The control valve body has a spring seat end cap at one end of the control valve passage, and a control spring is provided between the spring seat end cap and the control valve core. The control valve body has a control plug at the end of the control valve passage away from the control spring, and the control plug has a control oil port that communicates with the control valve passage. When the control valve core is pushed against the control plug by the control spring, the logic control valve is in the first control position, and the oil outlet of the logic valve is connected to the first oil inlet of the logic valve. When the control oil port is pressurized, the control valve core compresses the control spring and moves to the second control position, and the oil outlet of the logic valve is connected to the second oil inlet of the logic valve.

3. The novel logic composite control valve according to claim 1, characterized in that, A positioning ring is provided at one end of the logic control channel near the first spring. The limiting plunger has a T-shaped structure and cooperates with the logic control channel and passes through the positioning ring.

4. A novel logic composite control valve according to claim 1, characterized in that, The second pilot valve includes a second end cap with an opening at one end. The open end of the second end cap is connected to the main valve body of the directional valve. A second spring seat is provided inside the second end cap. A second seat ring is provided at one end of the outer wall of the second spring seat near the main valve body. A second spring is provided between the second seat ring and the inner end face of the second end cap. The main valve core is slidably inserted into the second spring seat. The second spring seat is provided with a second pressure transmission hole communicating with the interior. The second end cap is provided with a second pilot control oil port communicating with the interior.

5. A novel logic composite control valve according to claim 1, characterized in that, The reversing valve includes a three-position four-way reversing structure; The oil inlet passage of the three-position four-way reversing structure is equipped with a pressure compensation valve and a check valve. The first working port and the second working port of the three-position four-way reversing structure are respectively connected to the safety oil replenishment valve, and the second working port is connected to the load holding valve core. The three-position four-way reversing structure, pressure compensation valve, safety oil replenishment valve, and load holding valve are all located in the main valve body. The main valve core of the three-position four-way reversing structure is controlled by a logic control valve, a first pilot valve, and a second pilot valve.

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