Traveling valve element and traveling valve

Abstract

The utility model discloses a walking valve core and a walking valve, the valve core comprises a core shaft, the core shaft is provided with a first oil return ring, a first buffer oil drainage ring, an oil inlet ring, a second buffer oil drainage ring and a second oil return ring in sequence; the oil return ring is provided with an oil return groove; the buffering oil drainage ring is provided with a throttling buffering groove and a bypass unloading groove. The oil inlet ring is provided with a first oil inlet groove. Through the synergistic effect of the throttling buffer groove and the bypass unloading groove, the pressure oscillation fluctuation of the system can be reduced, the starting impact pressure of the action can be reduced, the stable starting and acceleration of the walking action are realized, and the controllability of the whole vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic transmission of engineering machinery, in particular to a traveling valve core and a traveling valve. Background Art

[0002] Excavators are widely used in infrastructure construction and are the mainstay of earthmoving operations. Current excavators are primarily driven directly or indirectly by travel motors. During startup and acceleration, due to vehicle inertia, the travel motion can experience jerks, causing vibrations and significantly impacting the customer experience.

[0003] Publication No. CN116044848A discloses a valve device comprising a main valve body, a main valve core, and a regeneration valve. The main valve body is provided with an oil inlet cavity communicating with oil port A. The regeneration valve comprises a regeneration valve core and a regeneration check valve. A regeneration throttling hole is formed through the outer wall of the regeneration valve core, and a return oil throttling groove is formed on the outer wall of the regeneration valve core. The main valve body is provided with a main valve body step at positions corresponding to the return oil throttling groove and the regeneration throttling hole. The valve device has a regeneration state and a regeneration release state. In the regeneration state, some oil flows through the return oil throttling groove into oil port T, while another part of oil flows through the regeneration throttling hole, pushing open the regeneration check valve, and flows into oil port P. In the regeneration release state, the regeneration throttling hole is completely blocked by the main valve body step and closed, and the return oil throttling groove is fully open. The valve device can simultaneously release flow regeneration and return oil throttling according to the pressure at oil port P, thereby reducing energy loss.

[0004] When this prior art is used for excavator travel control, there is a problem of setbacks during startup and acceleration.

[0005] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from those of the present utility model. Regarding the more technical features, technical problems to be solved and the beneficial effects of the present utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0006] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a traveling valve core and a traveling valve.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] On the one hand, the utility model provides a traveling valve core, including a core shaft, on which a first oil return ring, a first buffer oil drain ring, an oil inlet ring, a second buffer oil drain ring, and a second oil return ring are sequentially arranged; a first oil return groove is arranged on the outside of the end of the first oil return ring close to the oil inlet ring; a first throttling buffer groove is arranged on the outside of the end of the first buffer oil drain ring close to the first oil return ring; a first bypass unloading groove is arranged on the outer wall of the first buffer oil drain ring; a first oil inlet groove is arranged on the outside of the end of the oil inlet ring close to the first buffer oil drain ring; a second oil inlet groove is arranged on the outside of the end of the oil inlet ring close to the second buffer oil drain ring; a second throttling buffer groove is arranged on the outside of the end of the second buffer oil drain ring close to the second oil return ring; a second bypass unloading groove is arranged on the outer wall of the second buffer oil drain ring; a second oil return groove is arranged on the outside of the end of the second oil return ring close to the second buffer oil drain ring.

[0009] Furthermore, the first oil inlet groove, the second oil inlet groove, the first oil return groove, and the second oil return groove are double-diameter semi-circular grooves, and the double-diameter semi-circular grooves include a large semi-circular groove, and a small semi-circular groove is provided on the dome of the large semi-circular groove;

[0010] Specifically, the first throttling buffer groove and the second throttling buffer groove are semi-circular grooves;

[0011] Specifically, the first bypass unloading groove and the second bypass unloading groove are oblong grooves.

[0012] Furthermore, the outer walls of the first oil return ring, the first buffer oil drain ring, the second buffer oil drain ring, and the second oil return ring are all provided with oil storage rings;

[0013] Specifically, the oil storage ring is not connected to the first oil return groove, the second oil return groove, the first throttling buffer groove, and the second throttling buffer groove;

[0014] Specifically, the upper oil storage ring of the first buffer oil drain ring is communicated with the first bypass unloading groove, and the upper oil storage ring of the second buffer oil drain ring is communicated with the second bypass unloading groove.

[0015] Furthermore, the first oil return ring, the first buffer oil drain ring, the second buffer oil drain ring, and the second oil return ring are symmetrically distributed with the radial center plane of the oil inlet ring as the symmetry plane;

[0016] Specifically, at least one of the first oil return groove, the first throttling buffer groove, the first bypass unloading groove, the first oil inlet groove, the second oil inlet groove, the second bypass unloading groove, the second throttling buffer groove, and the second oil return groove is provided.

[0017] Furthermore, a first end shaft is provided at the end of the core shaft close to the first oil return ring, and a second end shaft is provided at the end of the core shaft close to the second oil return ring;

[0018] Specifically, the first oil return ring, the first buffer oil leakage ring, the oil inlet ring, the second buffer oil leakage ring, and the second oil return ring have the same outer diameters, and the first end shaft, the second end shaft, and the core shaft have outer diameters smaller than the first oil return ring.

[0019] On the second aspect, the utility model provides a walking valve, including a valve body and the valve core described in the first aspect; the valve body is provided with a through valve hole, the valve hole diameter is the same as the maximum outer diameter of the valve core, the valve hole is connected to the fifth oil channel, the seventh oil channel, the third oil channel, the second oil channel, the first oil channel, the fourth oil channel, the eighth oil channel, and the sixth oil channel in sequence, and all oil channels radially pass through the valve hole to form seven separating rings; the valve body is also provided with a first return oil port, a second return oil port, a first oil port, a second oil port, and an oil inlet; the fifth oil channel is connected to the first return oil port, and the first separating ring between the fifth oil channel and the seventh oil channel cooperates with the first return oil ring; the seventh oil channel is connected to the first oil port, and the third oil channel, The second oil channel and the fourth oil channel are intersected and connected, and the second separating ring between the seventh oil channel and the third oil channel, and the third separating ring between the third oil channel and the second oil channel cooperate with the first buffer oil drain ring; the first oil channel is connected to the oil inlet, and the fourth separating ring between the first oil channel and the second oil channel cooperates with the oil inlet ring; the eighth oil channel is connected to the second oil port, and the fifth separating ring between the first oil channel and the fourth oil channel, and the sixth separating ring between the fourth oil channel and the eighth oil channel cooperate with the second buffer oil drain ring; the sixth oil channel is connected to the second oil return port, and the seventh separating ring between the sixth oil channel and the eighth oil channel cooperates with the second oil return ring; the valve core and the separating ring are clearance-fitted and clearance-sealed.

[0020] Furthermore, gear grooves are provided at one end of the first separating ring close to the fifth oil passage, both ends of the second separating ring, both ends of the fourth separating ring, both ends of the sixth separating ring, and one end of the seventh separating ring close to the sixth oil passage.

[0021] Furthermore, the valve body is provided with control mechanisms at both ends of the valve hole;

[0022] Specifically, the control mechanism includes an end cover, a spring, and a spring seat;

[0023] Specifically, the end cover is provided with an oil port, the end cover is connected to the valve body by bolts, and the end cover and the valve body are sealed;

[0024] Specifically, the spring seat is provided with an axial variable diameter hole, the end of the variable diameter hole close to the valve body is a large diameter hole, the outer wall of the spring seat is provided with a convex ring at the end close to the valve body, the length of the spring seat is shorter than the length of the inner cavity of the end cover, and the large diameter hole of the spring seat is sleeved on the first end shaft or the second end shaft;

[0025] Specifically, the spring is sleeved on the outer wall of the spring seat, one end of the spring is pressed against the inner wall of the end cover, and the other end is pressed against the convex ring of the spring seat.

[0026] Furthermore, the spring is provided with an initial compression force for fixing the initial position of the valve core;

[0027] Specifically, when the valve core is in the initial position, the valve core and the valve body are in a completely gap-sealed state, with no flow channel;

[0028] Specifically, the lengths of the first bypass unloading groove and the second bypass unloading groove are smaller than the movement length of the valve core from the initial position to the limit position.

[0029] Furthermore, the valve body is provided with a first external opening;

[0030] Specifically, the first external port is connected to the intersection of the third oil channel, the second oil channel, and the fourth oil channel. A pressure compensation valve is provided at the first external port, and the pressure compensation valve separates the third oil channel, the second oil channel, and the fourth oil channel.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The utility model is provided with a throttling buffer groove. The throttling buffering effect of the throttling buffer groove will make the pressure and flow of the hydraulic oil passing through this groove more stable, reduce and lower the pressure oscillation of the pressure oil, thereby improving the setback phenomenon during walking and improving the controllability of the walking action.

[0033] 2. The utility model is provided with a bypass unloading groove, so that part of the hydraulic oil from the oil inlet directly enters the oil return port, which can reduce the starting impact pressure when the walking action is started.

[0034] 3. The utility model can reduce and lower the pressure oscillation fluctuation of the system through the synergistic effect of the throttling buffer groove and the bypass unloading groove, and can also reduce the starting impact pressure of the action, so as to achieve smooth starting and acceleration of the walking action and improve the controllability of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural diagram of a traveling valve core of the utility model;

[0036] Figure 2 This is a structural diagram of a valve body in a traveling valve of the utility model;

[0037] Figure 3 This is a structural diagram of a travel valve of the utility model;

[0038] Figure 4 The utility model is a traveling valve in which the opening area of the upper groove of the valve core changes.

[0039] In the figure: 1, valve body; 11, first oil passage; 12, second oil passage; 13, third oil passage; 14, fourth oil passage; 15, fifth oil passage; 16, sixth oil passage; 17, seventh oil passage; 18, eighth oil passage; 19, gear slot;

[0040] 2. Valve core; 21. Core shaft; 22. First oil return ring; 23. First buffer oil drain ring; 24. Oil inlet ring; 25. Second buffer oil drain ring; 26. Second oil return ring; 27. Second end shaft; 28. First end shaft; 2a. First oil return groove; 2b. First throttling buffer groove; 2c. Bypass unloading groove; 2d. First oil inlet groove; 2e. Second oil inlet groove; 2f. Second bypass unloading groove; 2g. Second throttling buffer groove; 2h. Second oil return groove;

[0041] 3. End cover; 4. Spring seat; 5. Spring; 6. Pressure compensation valve; 7. First oil plug; 8. Second oil plug;

[0042] A, first oil port; B, second oil port; C, third oil port; D, fourth oil port; P, oil inlet; T1, first oil return port; T2, second oil return port. DETAILED DESCRIPTION

[0043] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] Example 1:

[0045] See also Figure 1 The utility model provides a traveling valve core, wherein the valve core 2 includes a core shaft 21, on which a first oil return ring 22, a first buffer oil drain ring 23, an oil inlet ring 24, a second buffer oil drain ring 25, and a second oil return ring 26 are sequentially arranged.

[0046] A first oil return groove 2a is provided on the outside of the end of the first oil return ring 22 close to the oil inlet ring 24, a first throttling buffer groove 2b is provided on the outside of the end of the first buffer oil drain ring 23 close to the first oil return ring 22, a first bypass unloading groove 2c is provided on the outer wall of the first buffer oil drain ring 23, a first oil inlet groove 2d is provided on the outside of the end of the oil inlet ring 24 close to the first buffer oil drain ring 23, a second oil inlet groove 2e is provided on the outside of the end of the oil inlet ring 24 close to the second buffer oil drain ring 25, a second throttling buffer groove 2g is provided on the outside of the end of the second buffer oil drain ring 25 close to the second oil return ring 26, a second bypass unloading groove 2f is provided on the outer wall of the second buffer oil drain ring 25, and a second oil return groove 2h is provided on the outside of the end of the second oil return ring 26 close to the second buffer oil drain ring 25.

[0047] Among them, the first oil inlet groove 2d and the second oil inlet groove 2e are used for oil inlet, and the first oil return groove 2a and the second oil return groove 2h are used for oil return.

[0048] Among them, the first throttling buffer groove 2b and the second throttling buffer groove 2g are used for throttling buffering, and the first bypass unloading groove 2c and the second bypass unloading groove 2f are used to directly discharge part of the pressure into the return oil groove, so that the first buffer oil drain ring 23 and the second buffer oil drain ring 25 can achieve smooth micro-movement of the excavator's walking, smooth acceleration, and no sense of frustration.

[0049] Specifically, different operating effects can be achieved by adjusting the area and shape of the throttling buffer groove and the bypass unloading groove, as well as the area ratio of the oil inlet groove, the throttling buffer groove, the bypass unloading groove, and the oil return groove to meet the action requirements of different products and customers.

[0050] Preferably, the first oil inlet groove 2d, the second oil inlet groove 2e, the first oil return groove 2a, and the second oil return groove 2h are double-diameter semi-circular grooves, and the double-diameter semi-circular grooves include a large semi-circular groove, and a small semi-circular groove is provided on the dome of the large semi-circular groove, which can first conduct a smaller area and then quickly increase the conduction area to achieve smooth acceleration.

[0051] Preferably, the first throttling buffer groove 2b and the second throttling buffer groove 2g are semi-circular grooves.

[0052] Preferably, the first bypass unloading groove 2c and the second bypass unloading groove 2f are oblong grooves.

[0053] Furthermore, oil storage rings are provided on the outer walls of the first oil return ring 22, the first buffer oil drain ring 23, the second buffer oil drain ring 25, and the second oil return ring 26 for storing oil for lubrication; the oil storage rings are not connected to the first oil return groove 2a, the second oil return groove 2h, the first throttling buffer groove 2b, and the second throttling buffer groove 2g, the oil storage ring on the first buffer oil drain ring 23 is connected to the first bypass unloading groove 2c, and the oil storage ring on the second buffer oil drain ring 25 is connected to the second bypass unloading groove 2f.

[0054] Furthermore, a first end shaft 28 is provided at the end of the core shaft 21 close to the first oil return ring 22 , and a second end shaft 27 is provided at the end of the core shaft 21 close to the second oil return ring 26 . The first end shaft 28 and the second end shaft 27 are used to connect to the control mechanism.

[0055] Preferably, the first oil return ring 22 , the first buffer oil drain ring 23 , the second buffer oil drain ring 25 , and the second oil return ring 26 are symmetrically distributed with the radial center plane of the oil inlet ring 24 as the symmetry plane.

[0056] Preferably, the first oil return ring 22 , the first buffer oil drain ring 23 , the oil inlet ring 24 , the second buffer oil drain ring 25 , and the second oil return ring 26 have the same outer diameters, and the first end shaft 28 , the second end shaft 27 , and the core shaft 21 have smaller outer diameters than the first oil return ring 22 .

[0057] Preferably, at least one of the first oil return groove 2a, the first throttling buffer groove 2b, the first bypass unloading groove 2c, the first oil inlet groove 2d, the second oil inlet groove 2e, the second bypass unloading groove 2f, the second throttling buffer groove 2g, and the second oil return groove 2h is provided.

[0058] Example 2:

[0059] Based on Example 1, Figure 2 and Figure 3 This embodiment provides a walking valve, including a valve body 1 and the valve core 2 described in Example 1.

[0060] The valve body 1 is provided with a through valve hole, the aperture of the valve hole is the same as the maximum outer diameter of the valve core 2, and the valve hole is connected to the fifth oil channel 15, the seventh oil channel 17, the third oil channel 13, the second oil channel 12, the first oil channel 11, the fourth oil channel 14, the eighth oil channel 18, and the sixth oil channel 16 in sequence. All oil channels radially pass through the valve hole to form seven separation rings.

[0061] The valve body is further provided with a first oil return port T1, a second oil return port T2, a first oil port A, a second oil port B, and an oil inlet P.

[0062] The fifth oil passage 15 is communicated with the first oil return port T1 , and the first separation ring between the fifth oil passage 15 and the seventh oil passage 17 cooperates with the first oil return ring 22 .

[0063] Among them, the seventh oil channel 17 is connected to the first oil port A, the third oil channel 13, the second oil channel 12, and the fourth oil channel 14 are intersected and connected, and the second separating ring between the seventh oil channel 17 and the third oil channel 13, and the third separating ring between the third oil channel 13 and the second oil channel 12 cooperate with the first buffer oil drain ring 23.

[0064] The first oil passage 11 is connected to the oil inlet P, and the fourth separation ring between the first oil passage 11 and the second oil passage 12 cooperates with the oil inlet ring 24 .

[0065] The eighth oil passage 18 is connected to the second oil port B, and the fifth separation ring between the first oil passage 11 and the fourth oil passage 14 and the sixth separation ring between the fourth oil passage 14 and the eighth oil passage 18 cooperate with the second buffer oil drain ring 25 .

[0066] The sixth oil passage 16 is communicated with the second oil return port T2 , and the seventh separation ring between the sixth oil passage 16 and the eighth oil passage 18 cooperates with the second oil return ring 26 .

[0067] There is a clearance fit and a clearance seal between the valve core 2 and the separation ring.

[0068] Preferably, the valve body 1 is formed by casting.

[0069] Specifically, a gear groove 19 is provided at one end of the first separating ring close to the fifth oil channel 15, both ends of the second separating ring, both ends of the fourth separating ring, both ends of the sixth separating ring, and one end of the seventh separating ring close to the sixth oil channel 16. The gear groove 19 is used to control the opening area of the valve core 2 groove. The position of the valve core 2 is different, and the area of each groove passing through the front and back of the corresponding gear groove 19 is different; the area ratio of the oil inlet groove, throttling buffer groove, bypass unloading groove, and oil return groove during the movement process can be coordinated by controlling the depth of each gear groove 19.

[0070] Furthermore, the valve body 1 is provided with a control mechanism at both ends of the valve hole, and the control mechanism includes an end cover 3, a spring 4, and a spring seat 5. The end cover 3 is provided with an oil port, and the end cover 3 is connected to the valve body 1 by bolts. The end cover 3 and the valve body 1 are sealed by a gasket. The spring seat 5 is provided with an axial reducing hole, and the end of the reducing hole close to the valve body 1 is a large-diameter hole. A convex ring is provided on the outer wall of the spring seat 5 close to the valve body 1. The length of the spring seat 5 is shorter than the length of the inner cavity of the end cover 3. The large-diameter hole of the spring seat 5 is sleeved on the first end shaft 28 or the second end shaft 27. The spring 4 is sleeved on the outer wall of the spring seat 5, and one end of the spring 4 is pressed against the inner wall of the end cover 3, and the other end is pressed against the convex ring of the spring seat 5.

[0071] The spring seat 4 realizes the mechanical limit of the valve core 2 , and limits the stroke of the running valve core 2 after the spring seat 4 contacts the end cover 3 .

[0072] The spring 4 is provided with an initial compression force for fixing the initial position of the valve core 2 and providing a reset force for the valve core 2 after the action is completed.

[0073] Specifically, when the valve core 2 is in the initial position, the valve core 2 and the valve body 1 are in a completely gap-sealed state, and there is no flow channel.

[0074] Specifically, the length of the first bypass unloading groove 2c and the second bypass unloading groove 2f is smaller than the movement length of the valve core 2 from the initial position to the limit position, so that the first bypass unloading groove 2c and the second bypass unloading groove 2f can close the opening at the limit position.

[0075] The oil port of the end cover 3 is used to receive pilot oil, and the pilot oil passes through the reducing hole of the spring seat 4 in a control mechanism and acts on the end face of the first end shaft 28 or the second end shaft 27 of the valve core 2, generating thrust. When the thrust is greater than the initial compression force of the spring 4 in the opposite control mechanism, the valve core 2 begins to move inside the valve body 1, and the valve core 2 and the valve body 1 produce relative displacement; as the pressure of the pilot oil increases, the displacement of the valve core 2 increases, and the opening area of the groove on the valve core 2 and the separation ring of the valve body 1 changes (increases or decreases); in particular, the bypass unloading groove on the valve core 2 will increase in opening area first, then decrease or close as the valve core 2 moves; when the valve core 2 reaches its maximum stroke, the opening area of a group of oil inlet grooves, oil return grooves, and throttling buffer grooves of the valve core 2 reaches the maximum, and the bypass unloading groove area is the smallest or closed; at this time, the running flow is the largest and the speed is the fastest. Figure 4 Schematic diagram of the relationship between the opening areas of the oil inlet groove, the throttling buffer groove, and the bypass unloading groove and the displacement of the valve core 2 when the valve core 2 moves in the valve hole of the valve body 1.

[0076] Furthermore, the valve body 1 is provided with a first external port, a second external port, and a third external port. The first external port is connected to the intersection of the third oil channel 13, the second oil channel 12, and the fourth oil channel 14. The first external port is provided with a pressure compensation valve 6. The pressure compensation valve 6 separates the third oil channel 13, the second oil channel 12, and the fourth oil channel 14. The second external port is connected to the third oil channel 13. A first oil plug 7 is provided in the second external port. The third external port is connected to the fourth oil channel 14. A second oil plug 8 is provided in the third external port.

[0077] Among them, the pressure compensation valve 6 is used to set the oil inlet opening pressure and change the flow rate of the fluid by adjusting the cross-sectional area of the fluid, thereby achieving compensation and stabilization of the system excitation and protecting the safe operation of the system. The pressure compensation valve 6 itself belongs to the existing technology and can be purchased.

[0078] The second external port and the third external port are used for expansion and connection with other hydraulic control equipment, and can also be used as discharge holes for cleaning the valve body 1 , thereby facilitating maintenance of the valve body 1 .

[0079] Example 3:

[0080] Based on Example 2, this example provides a method for using a traveling valve. For ease of explanation, the control mechanisms provided at both ends of the valve hole of the valve body 1 are divided into a first control mechanism and a second control mechanism. The first control mechanism is connected to the first end shaft 28, and the second control mechanism is connected to the second end shaft 27. The end cover 3 of the first control mechanism is provided with a third oil port C, and the end cover 3 of the second control mechanism is provided with a fourth oil port D.

[0081] Specifically, the method of use includes the following steps:

[0082] S1. Connect the first and second oil ports to the travel motor, connect the third and fourth oil ports C and D to the control line of the handle or foot valve, and connect the oil inlet P, the first oil return port T1, and the second oil return port T2 to the oil tank.

[0083] S2. When the travel handle or foot valve is operated, the pilot oil from the handle or foot valve enters the end cover 3, thereby pushing the valve core 2 to move.

[0084] The hydraulic oil from S3 and the oil inlet P enters the oil channel through the oil inlet P of the valve core 2, then passes through the oil inlet ring 24 and the pressure compensation valve 6, and finally enters the travel motor through the throttle buffer groove. The hydraulic oil then flows out of the travel motor through the oil return groove and enters the oil return port;

[0085] Due to the throttling and buffering effect of the throttling buffer groove, the pressure and flow of the hydraulic oil passing through this place will become more stable, reducing and lowering the pressure oscillation of the pressure oil, thereby improving the setback phenomenon during walking and improving the controllability of the walking action;

[0086] At the same time, due to the existence of the bypass unloading groove, part of the hydraulic oil from the oil inlet P will directly enter the oil return port, which can reduce the starting impact pressure when the walking action is started;

[0087] Through the synergistic effect of the throttling buffer groove and the bypass unloading groove, not only can the pressure oscillation fluctuation of the system be reduced and lowered, but also the starting impact pressure of the action can be reduced, so that the starting and acceleration of the walking action can be smoothed, and the handling of the whole vehicle can be improved.

[0088] This embodiment provides a specific situation. In step S2, pilot oil from the travel handle or foot valve enters the third oil port C. The pilot oil acts on the end surface of the first end shaft 28 through the reducing hole of the spring seat 4, generating thrust. When the thrust is greater than the initial compression force of the spring 4 in the second control mechanism, the valve core 2 begins to move toward the second control mechanism within the valve body 1.

[0089] As the pilot oil pressure of the walking handle or foot valve increases, the displacement of the valve core 2 increases, the first throttling buffer groove 2b is connected to the third oil channel 13, the first oil inlet groove 2d is connected to the first oil channel 11, the second bypass unloading groove 2f is connected to the eighth oil channel 18, and the second oil return groove 2h is connected to the sixth oil channel 16. Figure 3 Position shown.

[0090] In step S3, the hydraulic oil in the tank enters the valve body 1 from the oil inlet P, passes through the first oil passage 11, the first oil inlet groove 2d, and the second oil passage 12 of the valve body 1, and reaches the pressure compensation valve 6. After the pressure meets the opening pressure of the pressure compensation valve 6, the hydraulic oil passes through the pressure compensation valve 6 and enters the third oil passage 13 and the fourth oil passage 14.

[0091] The hydraulic oil entering the third oil passage 13 passes through the first throttle buffer groove 2b, where it is buffered and throttled, and then enters the first oil port A, and finally enters the travel motor, causing the travel motor to start operating.

[0092] The hydraulic oil entering the fourth oil passage 14 passes through the second bypass unloading groove 2f and enters the eighth oil passage 18. Then, it passes through the second return oil groove 2h and enters the sixth oil passage 16. Then, it enters the second return oil port T2 and returns to the oil tank, realizing bypass oil return unloading.

[0093] At the same time, the return oil of the travel motor enters the eighth oil passage 18 through the second oil port B of the valve body 1, then enters the sixth oil passage 16 through the second oil return groove 2h, enters the second oil return port T2, and returns to the oil tank to achieve oil return;

[0094] Through the throttling buffer function of the first throttling buffer groove 2b of the valve core 2 and the unloading function of the second bypass unloading groove 2f, the hydraulic oil pressure entering the first oil port A is stable and the travel motor runs smoothly, ultimately achieving stable pressure, soft movement and improved control during the start-up and acceleration of the excavator's travel action; through the travel valve core structure of the present invention, the sense of frustration during the start-up and acceleration of the excavator's travel can be effectively solved, and the comfort and controllability of the walking action can be improved.

[0095] All components not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in the technical field and can be directly applied without further explanation.

[0096] In this utility model, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0097] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0098] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A traveling valve core, comprising a core shaft, characterized in that: The core shaft is provided with a first oil return ring, a first buffer oil drain ring, an oil inlet ring, a second buffer oil drain ring, and a second oil return ring in sequence; A first oil return groove is provided on the outer side of the end of the first oil return ring close to the oil inlet ring; A first throttling buffer groove is provided on the outer side of the end of the first buffer oil drain ring close to the first oil return ring; a first bypass unloading groove is provided on the outer wall of the first buffer oil drain ring; A first oil inlet groove is provided on the outer side of the end of the oil inlet ring close to the first buffer oil drain ring; A second oil inlet groove is provided on the outer side of the end of the oil inlet ring close to the second buffer oil drain ring; A second throttling buffer groove is provided on the outer side of the end of the second buffer oil drain ring close to the second oil return ring; a second bypass unloading groove is provided on the outer wall of the second buffer oil drain ring; A second oil return groove is provided outside the end of the second oil return ring close to the second buffer oil drain ring.

2. A traveling valve core according to claim 1, characterized in that: The first oil inlet groove, the second oil inlet groove, the first oil return groove, and the second oil return groove are double-diameter semi-circular grooves, wherein the double-diameter semi-circular grooves include a large semi-circular groove, and a small semi-circular groove is provided on the dome of the large semi-circular groove; The first throttling buffer groove and the second throttling buffer groove are semi-circular grooves; The first bypass unloading groove and the second bypass unloading groove are oblong grooves.

3. The traveling valve core according to claim 1, characterized in that: The outer walls of the first oil return ring, the first buffer oil drain ring, the second buffer oil drain ring and the second oil return ring are all provided with oil storage rings; The oil storage ring is not connected to the first oil return groove, the second oil return groove, the first throttling buffer groove, and the second throttling buffer groove; The oil storage ring on the first buffer oil drain ring is communicated with the first bypass unloading groove, and the oil storage ring on the second buffer oil drain ring is communicated with the second bypass unloading groove.

4. The traveling valve core according to claim 1, characterized in that: The first oil return ring, the first buffer oil drain ring, the second buffer oil drain ring, and the second oil return ring are symmetrically distributed with the radial center plane of the oil inlet ring as the symmetry plane; At least one of the first oil return groove, the first throttling buffer groove, the first bypass unloading groove, the first oil inlet groove, the second oil inlet groove, the second bypass unloading groove, the second throttling buffer groove, and the second oil return groove is provided.

5. A traveling valve core according to any one of claims 1 to 4, characterized in that: The end of the core shaft close to the first oil return ring is provided with a first end shaft, and the end of the core shaft close to the second oil return ring is provided with a second end shaft; The first oil return ring, the first buffer oil leakage ring, the oil inlet ring, the second buffer oil leakage ring and the second oil return ring have the same outer diameters, and the first end shaft, the second end shaft and the core shaft have outer diameters smaller than the first oil return ring.

6. A walking valve, comprising a valve body, characterized in that Also includes the valve core according to claim 5; The valve body is provided with a through valve hole, the diameter of the valve hole is the same as the maximum outer diameter of the valve core, the valve hole is connected to the fifth oil passage, the seventh oil passage, the third oil passage, the second oil passage, the first oil passage, the fourth oil passage, the eighth oil passage, and the sixth oil passage in sequence, and all the oil passages radially penetrate the valve hole to form seven separation rings; The valve body is also provided with a first oil return port, a second oil return port, a first oil port, a second oil port, and an oil inlet; The fifth oil passage is connected to the first oil return port, and the first separation ring between the fifth oil passage and the seventh oil passage cooperates with the first oil return ring; The seventh oil passage is connected to the first oil port, the third oil passage, the second oil passage, and the fourth oil passage intersect and communicate with each other, and the second separating ring between the seventh oil passage and the third oil passage and the third separating ring between the third oil passage and the second oil passage cooperate with the first buffer oil drain ring; The first oil passage is in communication with the oil inlet, and a fourth separating ring between the first oil passage and the second oil passage cooperates with the oil inlet ring; The eighth oil passage is connected to the second oil port, and the fifth separation ring between the first oil passage and the fourth oil passage, the sixth separation ring between the fourth oil passage and the eighth oil passage cooperate with the second buffer oil drain ring; The sixth oil passage is connected to the second oil return port, and the seventh separation ring between the sixth oil passage and the eighth oil passage cooperates with the second oil return ring; There is clearance fit and clearance sealing between the valve core and the separation ring.

7. A traveling valve according to claim 6, characterized in that: Shift grooves are provided at one end of the first separating ring close to the fifth oil passage, both ends of the second separating ring, both ends of the fourth separating ring, both ends of the sixth separating ring, and one end of the seventh separating ring close to the sixth oil passage.

8. The traveling valve according to claim 6, characterized in that: The valve body is provided with control mechanisms at both ends of the valve hole; The control mechanism includes an end cover, a spring, and a spring seat; The end cover is provided with an oil port, and the end cover is connected to the valve body by bolts, and the end cover and the valve body are sealed; The spring seat is provided with an axial variable diameter hole, the end of the variable diameter hole close to the valve body is a large diameter hole, the outer wall of the spring seat is provided with a convex ring at the end close to the valve body, the length of the spring seat is shorter than the length of the inner cavity of the end cover, and the large diameter hole of the spring seat is sleeved on the first end shaft or the second end shaft; The spring is sleeved on the outer wall of the spring seat, one end of the spring is pressed against the inner wall of the end cover, and the other end is pressed against the convex ring of the spring seat.

9. The traveling valve according to claim 8, characterized in that: The spring is provided with an initial compression force for fixing the initial position of the valve core; When the valve core is in the initial position, the valve core and the valve body are in a completely gap-sealed state, with no flow channel; The lengths of the first bypass unloading groove and the second bypass unloading groove are smaller than the movement length of the valve core from the initial position to the limit position.

10. The traveling valve according to claim 6, characterized in that: The valve body is provided with a first external opening; The first external opening is connected to the intersection of the third oil passage, the second oil passage, and the fourth oil passage. A pressure compensation valve is provided at the first external opening, and the pressure compensation valve separates the third oil passage, the second oil passage, and the fourth oil passage.

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