Load sensing multi-way valve

Abstract

The present application relates to the technical field of hydraulic equipment, disclose a kind of load-sensitive multi-way valve, including rear cover, the inside of the rear cover is provided with second valve core, the end of the second valve core is provided with tail top, the inside of the tail top is provided with end plug, the inner wall of the rear cover is provided with positioning clamping strip, the side of the positioning clamping strip away from rear cover is provided with positioning clamping groove and plane board, the middle part of the second valve core is provided with storage groove, the inside of the second valve core is provided with steel ball, the steel ball is located in storage groove, the middle part of the second valve core is provided with top rod, the middle part of the top rod is provided with conical extrusion block. By being provided with multiple positioning clamping grooves in the side of positioning clamping strip close to steel ball, different working positions are formed, thereby improve the positioning function of traditional hydraulic control valve mostly using spring, steel ball mechanism, vibration is easy to make steel ball mechanism positioning failure, thereby causing the problem of malfunction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic equipment, in particular to a load-sensitive multi-way valve. BACKGROUND

[0002] Hydraulic control valves are important components of hydraulic systems, mainly used to control and regulate the pressure, flow rate, and direction of oil in hydraulic systems to meet the working needs of various hydraulic equipment. They can be divided into pressure control valves, flow control valves, and directional control valves. Pressure control valves include relief valves and pressure reducing valves. Relief valves can maintain constant system pressure and prevent overloading, while pressure reducing valves can provide stable low pressure for specific branches. Flow control valves such as throttle valves and speed regulating valves adjust the flow rate by changing the size of the throttle opening to control the movement speed of the actuator. Directional control valves include directional control valves and check valves. Directional control valves are used to change the direction of oil flow to start, stop, and reverse the actuator, while check valves allow oil to flow in one direction only to prevent backflow. Hydraulic control valves have high control accuracy, fast response speed, and easy operation, and are widely used in machine tools, engineering machinery, metallurgical equipment, and other fields, playing a key role in improving the automation level, work efficiency, and reliability of equipment. The performance of hydraulic control valves directly affects the working performance and quality of hydraulic systems, and is one of the core components that ensure the normal operation of hydraulic equipment.

[0003] Traditional hydraulic control valves mostly use spring and ball mechanisms to achieve positioning function, but high-frequency vibrations are easily generated during the operation of construction machinery, which can cause displacement of the ball mechanism and result in positioning failure, thereby causing misoperation. SUMMARY

[0004] To overcome the shortcomings of the prior art, the present application provides a load-sensitive multi-way valve, which solves the problem of misoperation caused by the displacement of the ball mechanism and the positioning failure of the traditional hydraulic control valve using spring and ball mechanisms to achieve positioning function.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: a load-sensitive multi-way valve, comprising a rear cover, a second valve core is arranged inside the rear cover, a tail top is arranged at the end of the second valve core, an end plug is arranged inside the tail top, a positioning clamping strip is arranged on the inner wall of the rear cover, a positioning clamping groove and a flat plate are arranged on the side of the positioning clamping strip away from the rear cover, a storage groove is formed in the middle of the second valve core, a steel ball is arranged inside the second valve core, the steel ball is located inside the storage groove, a top rod is arranged in the middle of the second valve core, a conical extrusion block is arranged in the middle of the top rod, a tail rod is arranged at the end of the top rod, a second spring is arranged on the outer wall of the tail rod, one end of the second spring is located at the end of the conical extrusion block, and the other end of the tail rod is located at the end of the end plug.

[0006] By adopting the technical scheme, the positioning clamping strip is arranged on the inner wall of the rear cover, multiple positioning clamping grooves are arranged on one side of the positioning clamping strip close to the steel ball to form different working positions, the movement of the second valve core is limited through the clamping of the steel ball and the positioning clamping groove, the tapered extrusion block is pushed through the second spring, the steel ball is always extruded in the positioning clamping groove through the tapered extrusion block, and the problem that the steel ball moves out of the positioning clamping groove due to vibration is avoided, so that the problem that the traditional hydraulic control valve mostly adopts a spring and a steel ball mechanism to realize the positioning function, but the construction machinery is prone to high-frequency vibration during work, the vibration easily causes the steel ball mechanism to displace, the positioning fails, and the construction machinery is prone to misoperation is improved.

[0007] Preferably, the inner wall of the rear cover is fixedly connected with a positioning clamping ring, and the positioning clamping strip is provided with a limiting clamping groove on one side close to the rear cover.

[0008] Preferably, a first installation chamber and a second installation chamber are arranged in the middle of the second valve core, the top rod is arranged in the first installation chamber, the tapered extrusion block, the tail rod, the second spring and the end plug are arranged in the second installation chamber, and the outer wall of the end plug is fixedly connected to the inner wall of the second installation chamber.

[0009] Preferably, a first valve core is arranged on one side of the second valve core away from the end plug, a connecting chamber is arranged in the inner wall of one side of the first valve core close to the second valve core, the outer wall of one side of the second valve core close to the first valve core is fixedly connected to the inner wall of the connecting chamber, a first oil channel is arranged in the first valve core, a P-shaped oil port is arranged on the outer wall of one side of the first valve core away from the second valve core, the P-shaped oil port is in communication with the first oil channel, a pressure regulating plug is arranged on one side of the first installation chamber close to the first valve core, a second oil channel is arranged in the middle of the pressure regulating plug, and the first oil channel is in communication with the first installation chamber through the second oil channel.

[0010] Preferably, an overflow valve core is arranged on one side of the pressure regulating plug away from the first oil channel, the outer wall of the overflow valve core is slidably connected to an inner groove of the pressure regulating plug, the inner groove is in communication with the second oil channel, a third spring seat is arranged on one side of the overflow valve core away from the pressure regulating plug, and the outer wall of the third spring seat is slidably connected to the inner wall of the first installation chamber.

[0011] Preferably, a first oil discharge port is arranged on the outer wall of the first installation chamber, and a T-shaped oil port is arranged on one side of the first valve core close to the second valve core, in communication with the connecting chamber.

[0012] Preferably, a first spring is arranged on the outer wall of the top rod, one end of the first spring is located on one side of the third spring seat away from the pressure regulating plug, and the other end of the first spring is located on one end of the first installation chamber close to the second installation chamber.

[0013] Preferably, the second valve core is provided with a tail top near the end of the second installation chamber, the outer wall diameter of the tail top is smaller than the outer wall diameter of the second installation chamber, the outer wall of the tail top is provided with a first spring seat, the side of the end plug away from the second valve core is provided with a second spring seat, the third spring is arranged between the first spring seat and the second spring seat, the second spring seat is provided with a second limiting piece on the side of the outer wall away from the second valve core, one end of the third spring is arranged on the side of the first spring seat close to the second spring seat, and the other end of the third spring is arranged on the side of the second limiting piece close to the second valve core.

[0014] Preferably, the end plug is provided with an enlarged block on the side away from the second valve core, the outer wall diameter of the enlarged block is larger than the outer wall diameter of the end plug, the second spring seat is provided with a first limiting piece on the end away from the second limiting piece, the inner diameter of the first limiting piece is smaller than the outer diameter of the enlarged block, the first spring seat is provided with a third limiting piece on the side close to the storage groove, and the outer wall of the third limiting piece is fixedly connected to the inner wall of the rear cover.

[0015] Preferably, the second valve core is located in the multi-way valve, the multi-way valve is provided with a pressure compensation valve and a mechanical one-way valve, the inside of the multi-way valve is provided with an A-port oil channel, a first communication oil channel, a second communication oil channel, an oil inlet, a B-port oil channel, a second oil outlet and a third communication oil channel, the mechanical one-way valve is located in the B-port oil channel, the oil inlet can communicate with the second communication oil channel through a channel where the pressure compensation valve is located, the second communication oil channel can communicate with the first communication oil channel through a channel where the second valve core is located, the first communication oil channel away from the second communication oil channel can communicate with the third communication oil channel or the A-port oil channel through a channel where the second valve core is located, and the third communication oil channel can communicate with the B-port oil channel.

[0016] Working principle: when the reversing valve is in the initial working position, the first valve core is pulled, thereby driving the second valve core to move back and forth in the inside of the rear cover, at this time, the second spring always pushes the conical extrusion block to extrude the steel ball, when the second valve core moves to the bottom of the positioning clamping groove with the steel ball, the positioning clamping groove has space to make the steel ball move upward due to the extrusion of the conical extrusion block, and the working position is reached.

[0017] When the position needs to be changed, the first valve core is pulled, thereby giving the second valve core a parallel moving force, at this time, since the side of the positioning clamping groove is inclined, the parallel moving force can extrude the steel ball to move downward, at the same time, the conical extrusion block is extruded by the steel ball, thereby making the conical extrusion block move to the direction of the end plug, and extruding the second spring to make the second spring store energy, when the storage groove moves to the next positioning clamping groove, the tail rod can push the steel ball to move upward due to the space for the steel ball to move upward, thereby reaching the next working position.

[0018] When the mechanical load controlled by the present commutating device is too large, the oil will enter the first oil path from the P oil port, then push the overflow valve core to move in the direction of the ejector rod through the second oil path, then push the third spring seat to move, thereby pushing the ejector rod to move in the direction of the end plug, and then moving the conical extrusion block in the direction of the end plug, at this time the conical extrusion block loses the extrusion of the steel ball, so the steel ball will fall to the bottom of the storage groove, and then leave the positioning clamping groove, so that the second valve core loses the limiting of the positioning clamping strip, at this time the third spring pushes the first spring seat to move in the direction of the first valve core, and then pushes the storage groove to move to the working position, or pushes the second spring seat to move away from the second valve core, and then pulls the enlarged block away from the first valve core through the first limiting piece, and then moves the second valve core in the direction of the end plug to make the steel ball return to the initial working position, and then the oil in the first installation chamber flows into the connecting chamber through the first oil outlet, and then flows out from the T oil port of the connecting chamber side wall to release pressure.

[0019] The present application provides a load-sensitive multi-way valve.

[0020] 1、The present application sets a positioning clamping strip on the inner wall of the rear cover, and then sets a plurality of positioning clamping grooves on the side of the positioning clamping strip close to the steel ball to form different working positions, and the positioning clamping groove and the steel ball are clamped to limit the movement of the second valve core, and the second spring pushes the conical extrusion block, and then the conical extrusion block extrudes the steel ball to always be located in the positioning clamping groove, thereby avoiding the vibration of the steel ball from the positioning clamping groove, and improving the problem that the traditional hydraulic control valve mostly uses a spring and a steel ball mechanism to realize the positioning function, but the construction machinery is prone to high-frequency vibration during work, and the vibration easily causes the displacement of the steel ball mechanism and the failure of the positioning, thereby causing the misoperation.

[0021] 2、The present application can inject oil into the first oil path through the P oil port, and then the oil can push the overflow valve core and the third spring seat to move, thereby pushing the ejector rod to move in the direction of the end plug, and then driving the conical extrusion block to move in the direction of the end plug, so that the conical extrusion block loses the pushing force of the steel ball, and the steel ball falls into the bottom of the storage groove, thereby losing the clamping limiting effect with the positioning clamping groove, at this time the third spring pushes the first spring seat to move in the direction of the first valve core, and then pushes the storage groove to move to the working position, or pushes the second spring seat to move away from the second valve core, and then pulls the enlarged block away from the first valve core through the first limiting piece, and then moves the storage groove to the initial working position, thereby avoiding the damage of the related structure caused by the excessive load of the construction machinery.

[0022] 3. The application achieves the effect of limiting the working position by the positioning clamping strip, the steel ball and the conical extrusion block arranged in the rear cover, and the conical extrusion block is moved by the P oil port in the first valve core and the first oil path through the second oil path, so that the extrusion on the steel ball is lost, and then the second valve core is restored to the initial working position by the third spring in the rear cover, so that the structure is compact, the space utilization is increased, and the overall volume of the structure is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front perspective structural schematic diagram of the application;

[0024] Figure 2 It is a cross-sectional perspective structural schematic diagram of the application;

[0025] Figure 3 It is a perspective structural schematic diagram of the positioning clamping strip of the application;

[0026] Figure 4 It is a perspective structural schematic diagram of the ejector rod of the application;

[0027] Figure 5 It is a cross-sectional perspective structural schematic diagram of the first valve core of the application;

[0028] Figure 6 It is a cross-sectional perspective structural schematic diagram of the second valve core of the application;

[0029] Figure 7 It is a cross-sectional perspective structural schematic diagram of the plug and the second spring seat of the application;

[0030] Figure 8 It is an installation perspective structural schematic diagram of the third spring of the application;

[0031] Figure 9 It is a floating position schematic diagram of the multi-way valve of the application;

[0032] Figure 10 It is a first working position schematic diagram of the multi-way valve of the application;

[0033] Figure 11 It is a second working position schematic diagram of the multi-way valve of the application;

[0034] Figure 12 It is a closing position schematic diagram of the multi-way valve of the application.

[0035] Wherein, 1, rear cover; 2, T oil port; 3, first valve core; 4, P oil port; 5, first oil path; 6, pressure regulating plug; 7, first oil outlet; 8, first spring; 9, positioning snap ring; 10, steel ball; 11, positioning snap strip; 12, positioning snap groove; 13, second spring; 14, first spring seat; 15, end plug; 16, third spring; 17, second spring seat; 18, second oil path; 19, overflow valve core; 20, third spring seat; 21, top rod; 22, tapered extrusion block; 23, tail rod; 24, limit snap groove; 25, flat plate; 26, connecting chamber; 27, first mounting chamber; 28, second valve core; 29, storage groove; 30, second mounting chamber; 31, tail top; 32, first limit piece; 33, enlarged block; 34, second limit piece; 35, third limit piece; 36, A oil passage; 37, first communication oil passage; 38, second communication oil passage; 39, oil inlet; 40, pressure compensating valve; 41, B oil passage; 42, second oil outlet; 43, third communication oil passage; 44, multi-way valve. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] Please refer to the drawings of the present application Figure 1 - the drawings of the present application Figure 6 The embodiment of the present application provides a load-sensitive multi-way valve, which comprises a rear cover 1, the inside of the rear cover 1 is provided with a second valve core 28, the end of the second valve core 28 is provided with a tail top 31, the inside of the tail top 31 is provided with an end plug 15, the inner wall of the rear cover 1 is provided with a positioning snap strip 11, the side of the positioning snap strip 11 away from the rear cover 1 is provided with a positioning snap groove 12 and a flat plate 25, the middle of the second valve core 28 is provided with a storage groove 29, the inside of the second valve core 28 is provided with a steel ball 10, the steel ball 10 is located in the inside of the storage groove 29, the middle of the second valve core 28 is provided with a top rod 21, the middle of the top rod 21 is provided with a tapered extrusion block 22, the end of the top rod 21 is provided with a tail rod 23, the outer wall of the tail rod 23 is provided with a second spring 13, one end of the second spring 13 abuts against the end of the tapered extrusion block 22, the other end of the tail rod 23 is located at the end of the end plug 15.

[0038] Specifically, the rear cover 1 can protect and install the internal positioning clamping strip 11 and the second valve core 28; by controlling the second valve core 28 to move forward and backward inside the rear cover 1, the steel ball 10 and the top rod 21 can be driven to move; the tail top 31 can install the end plug 15; the end plug 15 can block the tail top 31, and the second spring 13 can be installed inside the tail top 31; the positioning clamping strip 11 can set the positioning clamping groove 12 and the flat plate 25; the steel ball 10 can enter the positioning clamping groove 12, and the positioning clamping groove 12 and the steel ball 10 can limit the movement of the second valve core 28, so that the positioning clamping groove 12 at different positions has different working positions; the flat plate 25 can press the steel ball 10 back into the storage groove 29, so that the reversing device is in the initial working position; the storage groove 29 can store the steel ball 10; when the steel ball 10 enters the storage groove 29, the reversing device can return to the initial working position; the steel ball 10 can be clamped with the positioning clamping groove 12, and the movement of the second valve core 28 can be limited when the machine vibrates; the top rod 21 can be connected with the tapered extrusion block 22; the tapered extrusion block 22 can push the steel ball 10 to move upward when it moves to the left, or the steel ball 10 moves downward to extrude the tapered extrusion block 22, so that the tapered extrusion block 22 moves to the right; the tail rod 23 can be connected with the tapered extrusion block 22, and can also install the second spring 13; the second spring 13 can push the tapered extrusion block 22 to move to the left; the end plug 15 can fix the side of the second spring 13 away from the tapered extrusion block 22, so that the second spring 13 cannot move to the direction of the end plug 15; when the tapered extrusion block 22 moves to the direction of the end plug 15, the second spring 13 can be compressed to store energy, and when the tapered extrusion block 22 loses pressure limitation, the energy can be released to push the tapered extrusion block 22 to move away from the second spring 13; the positioning clamping strip 11 is arranged on the inner wall of the rear cover 1, and multiple positioning clamping grooves 12 are arranged on the side of the positioning clamping strip 11 close to the steel ball 10 to form different working positions; the steel ball 10 and the positioning clamping groove 12 can be clamped to limit the movement of the second valve core 28; the tapered extrusion block 22 can extrude the steel ball 10 to be always located in the positioning clamping groove 12, so that the steel ball 10 cannot move out of the positioning clamping groove 12 due to vibration, thereby improving the traditional hydraulic control valve which mostly uses a spring and a steel ball 10 mechanism to realize positioning function, but the construction machinery is easy to produce high-frequency vibration when working, and the vibration can cause the steel ball 10 mechanism to displace and cause positioning failure, thereby causing misoperation.

[0039] Please refer to the attached Figure 2 -attachedFigure 3 The inner wall of the rear cover 1 is fixedly connected with a positioning clasp 9, and a limiting clamping groove 24 is arranged on the side of the positioning clamping strip 11 close to the rear cover 1, and the positioning clasp 9 is located inside the limiting clamping groove 24.

[0040] Specifically, the positioning clasp 9 can fix and install the steel ball 10, the limiting clamping groove 24 can provide the positioning clamping strip 11 with an installation position of the positioning clasp 9, so that the positioning clamping strip 11 can be limited from moving, and the position of each limiting clamping groove 12 of the positioning clamping strip 11 is fixed, thereby ensuring the working position to be clear for a long time.

[0041] Please refer to the accompanying drawings Figure 2 - the accompanying drawings Figure 6 The middle part of the second valve core 28 is provided with a first installation chamber 27 and a second installation chamber 30, the top rod 21 is located inside the first installation chamber 27, the conical extrusion block 22, the tail rod 23, the second spring 13 and the end plug 15 are located inside the second installation chamber 30, and the outer wall of the end plug 15 is fixedly connected to the inner wall of the second installation chamber 30.

[0042] Specifically, the first installation chamber 27 can accommodate the top rod 21, and the second installation chamber 30 can accommodate the conical extrusion block 22, the tail rod 23, the second spring 13 and the end plug 15, so that the related structures can move smoothly.

[0043] Please refer to the accompanying drawings Figure 1 - the accompanying drawings Figure 6 The first valve core 3 is arranged on the side of the second valve core 28 away from the end plug 15, the inner wall of the side of the first valve core 3 close to the second valve core 28 is provided with a connecting chamber 26, the outer wall of the side of the second valve core 28 close to the first valve core 3 is fixedly connected to the inner wall of the connecting chamber 26, the inner part of the first valve core 3 is provided with a first oil way 5, the outer wall of the side of the first valve core 3 away from the second valve core 28 is provided with a P-shaped oil port 4, the P-shaped oil port 4 is in communication with the first oil way 5, the side of the first installation chamber 27 close to the first valve core 3 is provided with a pressure regulating plug 6, the middle part of the pressure regulating plug 6 is provided with a second oil way 18, the first oil way 5 is in communication with the first installation chamber 27 through the second oil way 18.

[0044] Specifically, the first valve core 3 can connect the second valve core 28, and then the first valve core 3 can drive the second valve core 28 to move, so as to achieve the purpose of reversing; the connecting chamber 26 can install the second valve core 28; the first oil way 5 can supply oil liquid; the P oil port 4 communicates with the first oil way 5, so that the external oil liquid can enter the first oil way 5 through the P oil port 4; the pressure regulating plug 6 can close the first mounting chamber 27; the second oil way 18 can supply oil liquid into the first mounting chamber 27, so that the diameter of the oil way is changed from the large diameter of the first mounting chamber 27 to the small diameter of the second oil way 18, so as to improve the oil pressure, and then the oil liquid enters the first mounting chamber 27 with a large pressure.

[0045] Please refer to the accompanying drawings Figure 2 and the accompanying drawings Figure 6 , the pressure regulating plug 6 is provided with an overflow valve core 19 away from the first oil way 5, the outer wall of the overflow valve core 19 is slidably connected to the inner groove of the pressure regulating plug 6, the inner groove communicates with the second oil way 18, and the third spring seat 20 is provided away from the pressure regulating plug 6. The outer wall of the third spring seat 20 is slidably connected to the inner wall of the first mounting chamber 27.

[0046] Specifically, the overflow valve core 19 can push the third spring seat 20, the oil liquid discharged through the second oil way 18 pushes the overflow valve core 19 to move, and then the overflow valve core 19 pushes the third spring seat 20 to move.

[0047] Please refer to the accompanying drawings Figure 1 - the accompanying drawings Figure 6 , the outer wall of the first mounting chamber 27 is provided with a first oil discharge port 7, and the side of the first valve core 3 close to the second valve core 28 is provided with a T oil port 2, which communicates with the connecting chamber 26.

[0048] Specifically, the first oil discharge port 7 can discharge the oil liquid in the first mounting chamber 27 to the connecting chamber 26, so that the first mounting chamber 27 will not appear high pressure; the T oil port 2 communicates with the connecting chamber 26, so that the oil liquid can be discharged from the connecting chamber 26, and the purpose of pressure relief is achieved.

[0049] Please refer to the accompanying drawings Figure 2 - the accompanying drawings Figure 6 , the outer wall of the top rod 21 is provided with a first spring 8, one end of the first spring 8 is located away from the third spring seat 20 of the pressure regulating plug 6, and the other end of the first spring 8 is located at one end of the first mounting chamber 27 close to the second mounting chamber 30.

[0050] Specifically, the first spring 8 can push the third spring seat 20 to move or be pushed by the third spring seat 20 to compress the energy storage.

[0051] Please refer to the attached drawings Figure 2 -attached drawings Figure 8 The end of the second valve core 28 close to the second installation chamber 30 is provided with a tail top 31, the outer wall diameter of the tail top 31 is smaller than the outer wall diameter of the second installation chamber 30, the outer wall of the tail top 31 is provided with the first spring seat 14, the side of the end plug 15 away from the second valve core 28 is provided with the second spring seat 17, the first spring seat 14 and the second spring seat 17 are provided with the third spring 16, the outer wall of the side of the second spring seat 17 away from the second valve core 28 is provided with the second limiting piece 34, one end of the third spring 16 is provided on the side of the first spring seat 14 close to the second spring seat 17, the other end of the third spring 16 is provided on the side of the second limiting piece 34 close to the second valve core 28.

[0052] Specifically, the tail top 31 can install the first spring seat 14; the outer wall diameter of the tail top 31 is smaller than the outer wall diameter of the second installation chamber 30, so that a stepped shape is formed on the outer wall of the second valve core 28, and then abuts against the first spring seat 14, so that the second valve core 28 drives the first spring seat 14 to move in the direction of the second spring seat 17, or the first spring seat 14 drives the second valve core 28 to move in the direction of the first valve core 3; the first spring seat 14 and the second spring seat 17 can install the third spring 16, and the second limiting piece 34 can abut against the end of the third spring 16.

[0053] Please refer to the attached drawings Figure 2 -attached drawings Figure 8 The side of the end plug 15 away from the second valve core 28 is provided with an enlarged block 33, the outer wall diameter of the enlarged block 33 is greater than the outer wall diameter of the end plug 15, the end of the second spring seat 17 away from the second limiting piece 34 is provided with the first limiting piece 32, the inner diameter of the first limiting piece 32 is smaller than the outer diameter of the enlarged block 33, the side of the first spring seat 14 close to the storage groove 29 is provided with the third limiting piece 35, and the outer wall of the third limiting piece 35 is fixedly connected to the inner wall of the rear cover 1.

[0054] Specifically, the expansion block 33 can always limit the end plug 15 inside the second spring seat 17; the outer wall diameter of the expansion block 33 is larger than that of the end plug 15, thereby avoiding the end plug 15 from escaping from the middle opening of the first limiting piece 32; the inner diameter of the first limiting piece 32 is smaller than the outer diameter of the expansion block 33, thereby limiting the expansion block 33 from escaping from the second spring seat 17; the third limiting piece 35 can limit the movement of the first spring seat 14, thereby avoiding the excessive movement of the first spring seat 14 pushed by the third spring 16; the outer wall of the third limiting piece 35 is fixedly connected to the inner wall of the rear cover 1, thereby reliably installing the third limiting piece 35 inside the rear cover 1.

[0055] Please refer to the attached drawings Figure 1 -attached drawings Figure 12 The second spool 28 is located inside the multi-way valve 44, the multi-way valve 44 is provided with a pressure compensation valve 40 and a mechanical check valve, the multi-way valve 44 is provided with an A port oil way 36, a first communication oil way 37, a second communication oil way 38, an oil inlet 39, a B port oil way 41, a second oil outlet 42 and a third communication oil way 43, the mechanical check valve is located inside the B port oil way 41, the oil inlet 39 can communicate with the second communication oil way 38 through the channel where the pressure compensation valve 40 is located, the second communication oil way 38 can communicate with the first communication oil way 37 through the channel where the second spool 28 is located, the end of the first communication oil way 37 away from the second communication oil way 38 can communicate with the third communication oil way 43 or the A port oil way 36 through the channel where the second spool 28 is located, and the third communication oil way 43 can communicate with the B port oil way 41.

[0056] Specifically, the multi-way valve 44 can open the B port oil channel 41, the second oil discharge port 42 and related structures; the pressure compensation valve 40 can control the oil pressure discharged from the oil inlet 39, thereby protecting the external machinery; the mechanical check valve can control the flow of oil in the B port oil channel 41; the multi-way valve 44 has the A port oil channel 36, the first communication oil channel 37, the second communication oil channel 38, the oil inlet 39, the B port oil channel 41, the second oil discharge port 42 and the third communication oil channel 43, so that the oil flows in different directions in the multi-way valve 44, thereby driving the machinery to different working states; when the first valve core 3 is pulled, the internal structure of the rear cover 1 is in the floating position, at this time, the oil enters from the oil inlet 39, is blocked by the outer wall of the first valve core 3 through the second communication oil channel 38, at this time, the external machinery cannot be supplied with oil, and the oil in the pipeline of the external machinery can enter the second oil discharge port 42 through the A port oil channel 36 and the B port oil channel 41, so that the external machinery can move freely, for example, the agricultural machinery does not need to be lifted for a long time when moving on the uneven ground, and can be freely floated according to the terrain; when the first valve core 3 is pulled, the internal structure of the rear cover 1 is in the first working position, at this time, the oil enters from the oil inlet 39, enters the first communication oil channel 37 through the second communication oil channel 38, then enters the A port oil channel 36 through the flow channel in the first valve core 3, then enters the external machinery through the outlet of the A port oil channel 36, then enters the B port oil channel 41 through the inlet of the external machinery, then enters the second oil discharge port 42 through the third communication oil channel 43, at this time, the external machinery can be controlled to work in one direction; when the first valve core 3 is pulled, the internal structure of the rear cover 1 is in the second working position, at this time, the oil enters from the oil inlet 39, enters the first communication oil channel 37 through the second communication oil channel 38, then enters the third communication oil channel 43 through the flow channel of the first valve core 3 close to the rear cover 1, then enters the B port oil channel 41 through the outlet of the third communication oil channel 43, then enters the external machinery through the B port oil channel 41, then enters the A port oil channel 36 through the external machinery, and then the oil is transported to the second oil discharge port 42 through the A port oil channel 36, at this time, the external machinery can be controlled to work in the other direction; when the first valve core 3 is pulled, the internal structure of the rear cover 1 is in the closed position, at this time, the oil enters from the oil inlet 39, is blocked by the outer wall of the first valve core 3 and the flow channel of the first valve core 3 through the second communication oil channel 38, at this time, the external machinery cannot be supplied with oil, and the flow channels of the A port oil channel 36 and the B port oil channel 41 close to the first valve core 3 are also blocked by the outer wall of the first valve core 3 and the flow channel of the first valve core 3, at this time, the external machinery is locked and stops working.

[0057] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A load-sensitive multi-way valve, comprising a rear cover (1), characterized in that, The rear cover (1) is provided with a second valve core (28) inside. The end of the second valve core (28) is provided with a tail top (31). The tail top (31) is provided with an end plug (15) inside. The inner wall of the rear cover (1) is provided with a positioning strip (11). The side of the positioning strip (11) away from the rear cover (1) is provided with a positioning groove (12) and a flat panel (25). The second valve core (28) is provided with a storage slot (29) in the middle. The second valve core (28) is provided with a steel... Ball (10), the steel ball (10) is located inside the storage tank (29), the second valve core (28) is provided with a top rod (21) in the middle, the top rod (21) is provided with a conical extrusion block (22) in the middle, the top rod (21) is provided with a tail rod (23) at the end, the tail rod (23) is provided with a second spring (13) on the outer wall, one end of the second spring (13) is abutted against the end of the conical extrusion block (22), and the other end of the tail rod (23) is located at the end of the end plug (15); The second valve core (28) has a first installation chamber (27) and a second installation chamber (30) in the middle. The top rod (21) is located inside the first installation chamber (27). The conical extrusion block (22), tail rod (23), second spring (13) and end plug (15) are located inside the second installation chamber (30). The outer wall of the end plug (15) is fixedly connected to the inner wall of the second installation chamber (30). A first valve core (3) is provided on the side of the second valve core (28) away from the end plug (15). A connecting chamber (26) is provided inside the side of the first valve core (3) near the second valve core (28). The outer wall of the side of the second valve core (28) near the first valve core (3) is fixedly connected to the inner wall of the connecting chamber (26). A first oil passage (5) is provided inside the first valve core (3). A P-type oil port (4) is provided on the outer wall of the side of the first valve core (3) away from the second valve core (28). The P-type oil port (4) is connected to the first oil passage (5). A pressure regulating plug (6) is provided on the side of the first installation chamber (27) near the first valve core (3). A second oil passage (18) is provided in the middle of the pressure regulating plug (6). The first oil passage (5) is connected to the first installation chamber (27) through the second oil passage (18).

2. The load-sensitive multi-way valve according to claim 1, characterized in that, The inner wall of the back cover (1) is fixedly connected with a positioning ring (9), and the positioning strip (11) has a limiting groove (24) on the side near the back cover (1), and the positioning ring (9) is located inside the limiting groove (24).

3. The load-sensitive multi-way valve according to claim 1, characterized in that, An overflow valve core (19) is provided on the side of the pressure regulating plug (6) away from the first oil passage (5). The outer wall of the overflow valve core (19) is slidably connected to the inner groove of the pressure regulating plug (6). The inner groove is connected to the second oil passage (18). A third spring seat (20) is provided on the side of the overflow valve core (19) away from the pressure regulating plug (6). The outer wall of the third spring seat (20) is slidably connected to the inner wall of the first mounting chamber (27).

4. The load-sensitive multi-way valve according to claim 1, characterized in that, The outer wall of the first installation chamber (27) is provided with a first oil drain port (7), and the first valve core (3) is provided with a T-type oil port (2) on the side near the second valve core (28). The T-type oil port (2) is connected to the connecting chamber (26).

5. A load-sensitive multi-way valve according to claim 3, characterized in that, The outer wall of the top rod (21) is provided with a first spring (8). One end of the first spring (8) is located on the side of the third spring seat (20) away from the pressure regulating plug (6), and the other end of the first spring (8) is located at the end of the first mounting chamber (27) near the second mounting chamber (30).

6. A load-sensitive multi-way valve according to claim 4, characterized in that, The second valve core (28) is provided with a tail top (31) at the end near the second mounting chamber (30). The outer diameter of the tail top (31) is smaller than the outer diameter of the second mounting chamber (30). The outer wall of the tail top (31) is provided with a first spring seat (14). The end plug (15) is provided with a second spring seat (17) on the side away from the second valve core (28). A third spring (16) is provided between the first spring seat (14) and the second spring seat (17). The outer wall of the second spring seat (17) away from the second valve core (28) is provided with a second limiting piece (34). One end of the third spring (16) is provided on the side of the first spring seat (14) near the second spring seat (17), and the other end of the third spring (16) is provided on the side of the second limiting piece (34) near the second valve core (28).

7. A load-sensitive multi-way valve according to claim 6, characterized in that, An enlarged block (33) is provided on the side of the end plug (15) away from the second valve core (28). The outer diameter of the enlarged block (33) is larger than the outer diameter of the end plug (15). A first limiting piece (32) is provided on the end of the second spring seat (17) away from the second limiting piece (34). The inner diameter of the first limiting piece (32) is smaller than the outer diameter of the enlarged block (33). A third limiting piece (35) is provided on the side of the first spring seat (14) near the storage slot (29). The outer wall of the third limiting piece (35) is fixedly connected to the inner wall of the rear cover (1).

8. A load-sensitive multi-way valve according to claim 7, characterized in that, The second valve core (28) is located inside the multi-way valve (44). The multi-way valve (44) is equipped with a pressure compensation valve (40) and a mechanical check valve. The multi-way valve (44) has an A-port oil passage (36), a first connecting oil passage (37), a second connecting oil passage (38), an oil inlet (39), a B-port oil passage (41), a second oil outlet (42), and a third connecting oil passage (43). The mechanical check valve is located inside the B-port oil passage (41). The oil inlet (39) It can be connected to the second connecting oil passage (38) through the channel where the pressure compensation valve (40) is located. The second connecting oil passage (38) can be connected to the first connecting oil passage (37) through the channel where the second valve core (28) is located. The end of the first connecting oil passage (37) away from the second connecting oil passage (38) can be connected to the third connecting oil passage (43) or the A port oil passage (36) through the channel where the second valve core (28) is located. The third connecting oil passage (43) can be connected to the B port oil passage (41).

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