Valve core, valve core processing method, hydraulic valve and excavator

Abstract

The embodiment of the present invention provides a valve core, a valve core processing method, a hydraulic valve and an excavator, and relates to the technical field of hydraulic valve manufacturing. The valve core is provided with an opening groove, the bottom of the opening groove is convex, the width of the opening groove gradually increases with the displacement of the valve core during the opening of the valve core, and the depth of the opening groove gradually increases with the displacement of the valve core during the opening of the valve core. When the valve core moves in the valve body, it can change the flow of the opening groove of the valve core, so that the flow change is more stable, thereby improving the operability of the excavator.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valve manufacturing, and in particular to a valve core, a valve core processing method, a hydraulic valve and an excavator. Background Art

[0002] At present, most construction machinery transmissions are driven by hydraulics. Hydraulic excavators achieve excavation and unloading through single or compound actions of boom, dipper arm, bucket and rotation. The operator operates the pilot handle in the cab to switch the main valve core. The pressure oil pumped out is supplied to each working device, and the return oil from the working device is discharged to the oil tank.

[0003] Generally, one of the most important indicators for evaluating the quality of an excavator is its operability. Due to its diverse uses, its operability is extremely important. The inventor has found through long-term research that the amount of oil from the pump to the working device and the amount of oil returned from the working device to the oil tank will directly affect the operability of the excavator. Therefore, how to improve the operability of the excavator is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The objects of the present invention include, for example, providing a valve core, a valve core processing method, a hydraulic valve and an excavator, which can realize the variable opening of the valve core, improve the stability of the oil intake and return oil amounts, and thus improve the operability of the excavator.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In the first aspect, an embodiment of the present invention provides a valve core, which is applied to a valve body; an opening groove is provided on the valve core, the bottom of the opening groove is convex, the width of the opening groove gradually increases with the increase of the displacement of the valve core during the opening of the valve core, and the depth of the opening groove gradually increases with the increase of the displacement of the valve core during the opening of the valve core.

[0007] In an optional embodiment, the bottom of the open groove is convex in the form of a parabolic curved surface.

[0008] In an optional embodiment, the opening area of ​​the valve core is A, and the displacement of the valve core during the opening process is X, wherein: A=f(X 3 ).

[0009] In an optional embodiment, the valve core includes a core body and an axial end arranged at an end of the core body, the diameter of the axial end is smaller than the diameter of the core body; and the open groove is provided on the core body.

[0010] In an optional embodiment, the open groove is opened on the end of the core body close to the shaft end.

[0011] In an optional embodiment, the open groove extends from the outer peripheral surface of the core body to the end surface of the core body close to the shaft end.

[0012] In an optional embodiment, there are multiple open slots, and the multiple open slots are evenly distributed on the core.

[0013] In the second aspect, an embodiment of the present invention provides a valve core processing method for processing a valve core as described in any of the aforementioned embodiments; a processing tool moves along the outer circumference of the valve core toward the end face of the valve core in a convex curved path, and rotates around the axis of the processing tool itself during the movement to form the opening groove.

[0014] In an optional embodiment, in the step of moving the machining tool along the outer circumference of the valve core toward the end surface of the valve core in a convex curve path, the convex curve is a parabola.

[0015] In a third aspect, an embodiment of the present invention provides a hydraulic valve, comprising a valve body and a valve core as described in any one of the above embodiments, wherein the valve core is installed in the valve body. An opening groove is provided on the valve core, the bottom of the opening groove is convex, the width of the opening groove gradually increases with the displacement of the valve core during the opening of the valve core, and the depth of the opening groove gradually increases with the displacement of the valve core during the opening of the valve core.

[0016] In a fourth aspect, an embodiment of the present invention provides an excavator, comprising a hydraulic valve as described in the aforementioned embodiment.

[0017] The beneficial effects of the embodiments of the present invention include, for example:

[0018] The valve core provided by the embodiment of the present invention has a convex bottom of the opening groove of the valve core, and the width of the opening groove gradually increases with the displacement of the valve core during the opening of the valve core, and the depth of the opening groove gradually increases with the displacement of the valve core during the opening of the valve core. In this way, during the movement of the valve core, the opening area of ​​the valve core is changed to adjust the oil intake or oil return amount, thereby improving the operability of the excavator.

[0019] In the valve core processing method provided by the embodiment of the present invention, the processing tool moves along the outer circumference of the valve core toward the end surface of the valve core in a convex curved path, and the processing tool rotates around its own axis during the movement to form an open groove. The open groove processed in this way can achieve a variable opening size during the movement of the valve core, and adjust the oil inlet or oil return amount of the hydraulic valve to improve the operability of the whole machine.

[0020] The hydraulic valve provided in the embodiment of the present invention includes the above-mentioned valve core. Since an opening groove with a special structure is provided on the valve core, it is beneficial to adjust the oil inlet and oil return amount of the hydraulic valve, thereby making the hydraulic valve move more smoothly and improving the operability of the whole machine.

[0021] The excavator provided by the embodiment of the present invention includes the above-mentioned hydraulic valve, which can adjust the oil inlet and oil return amounts of the hydraulic valve during the movement of the valve core, thereby improving the operability of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic structural diagram of an opening slot of a valve core from a first perspective provided in a specific embodiment of the present invention;

[0024] Figure 2 A structural schematic diagram of an opening groove of a valve core provided in a specific embodiment of the present invention from a second viewing angle;

[0025] Figure 3 A schematic diagram of the structure of a valve core and a valve body in a working condition provided by a specific embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the structure of the valve core and the valve body in another working condition provided by a specific embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the relationship between the opening area and displacement of the valve core provided in a specific embodiment of the present invention;

[0028] Figure 6 It is a structural schematic diagram of a valve core in the prior art from a first perspective;

[0029] Figure 7 A schematic structural diagram of a valve core in the prior art from a second perspective;

[0030] Figure 8 A schematic structural diagram of another valve core in the prior art from a first perspective;

[0031] Fig. 9 A schematic structural diagram of another valve core in the prior art from a second perspective;

[0032] Fig.10 A schematic diagram of a method for processing an opening groove of a valve core provided in a specific embodiment of the present invention.

[0033] Icon: 100-valve core; 110-core body; 120-shaft end; 111-opening groove; 130-supporting part; 200-hydraulic valve; 210-valve body; 211-assembly hole; 213-first end; 215-second end; 220-pump supply channel; 230-cylinder channel; 241-elastic member; 243-operating end; 101-first groove; 103-second groove; 160-machining tool. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0039] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0040] One of the most important indicators for evaluating the quality of an excavator is its operability, which is crucial due to its diverse uses. A hydraulic excavator achieves excavation and unloading through a single or compound action of a boom, a dipper, a bucket, and a rotation. The operator operates the pilot handle in the cab to switch the main valve spool, and the pressure oil from the pump is supplied to each working device, while the return oil from the working device is discharged to the oil tank. The inventor has found through long-term research that the amount of oil pumped to the working device and the amount of oil returned from the working device to the oil tank can be adjusted by changing the variable opening structure of the valve core, thereby achieving the purpose of improving the operability of the excavator.

[0041] In the prior art, the opening structures of the valve core are various, such as V-shaped grooves, K-shaped grooves, etc. Most of them are formed based on a single groove or a combination of single grooves. Regardless of the type of groove, the bottom structure of the groove is a concave shape or a straight line with a certain change formed by the shape of the machining tool relative to the moving direction of the valve core, which does not solve the operability problem well. Based on the defects of the prior art, the present application proposes a valve core 100, whose opening groove 111 structure can adjust the oil intake and oil return of the hydraulic valve 200 to improve the operability of the excavator.

[0042] Please refer to Figure 1 and Figure 2 The embodiment of the present invention provides a valve core 100, which is applied to a valve body 210 (see Figure 3 ) on the valve core 100; an opening groove 111 is provided on the valve core 100, and the bottom of the opening groove 111 is convex, and the width of the opening groove 111 gradually increases with the displacement of the valve core 100 during the opening process of the valve core 100, and the depth of the opening groove 111 gradually increases with the displacement of the valve core 100 during the opening process of the valve core 100. Since the width and depth of the opening groove 111 change with the movement of the valve core 100, the oil intake is constantly changing during the opening process of the valve core 100, and the oil return is also constantly changing during the closing process of the valve core 100. That is, the specific structure of the opening groove 111 enables the variable opening of the valve core 100, that is, the opening area, to adjust the oil intake and oil return during the movement of the valve core 100, and the bottom of the opening groove 111 is convex, and its adjustment amount is relatively stable. In the process of adjusting the variable opening of the valve core 100 to the maximum oil intake when the valve core 100 is at its maximum displacement, the switching is relatively smooth, which is conducive to improving operability.

[0043] Optionally, the bottom of the opening groove 111 in this embodiment is a parabolic convexity. The parabolic convex structure can make the oil intake and oil return of the opening groove 111 change in a smooth curve during the movement of the valve core 100, reduce the sense of operational frustration, and improve operational performance. It can be understood that the opening area of ​​the valve core 100 determines the amount of oil intake and oil return. During the movement of the valve core 100, the opening area A of the valve core 100 and the displacement X of the valve core 100 satisfy the following relationship, that is, A=f(X 3 ), which can greatly improve the operability of the hydraulic excavator.

[0044] Further, the valve core 100 provided in this embodiment includes a core body 110 and a shaft end 120 provided at the end of the core body 110, and the diameter of the shaft end 120 is smaller than the diameter of the core body 110. The shaft end 120 is used to receive the operation signal of the pilot handle to push the core body 110 to move. An open groove 111 is provided on the core body 110. In detail, the end of the core body 110 close to the shaft end 120 is provided with an open groove 111, and the open groove 111 extends from the outer peripheral surface of the core body 110 to the end surface of the core body 110 close to the shaft end 120, and the extension direction of the groove bottom of the open groove 111 is parabolic convex.

[0045] Optionally, the number of the open grooves 111 can be one or more, in order to improve the uniformity and stability of the oil intake and oil return. In this embodiment, the number of the open grooves 111 is multiple, and the multiple open grooves 111 are evenly distributed on the core 110, for example, there can be two, three, four, five or six open grooves 111, which are evenly spaced along the outer peripheral surface of the core 110. The multiple open grooves 111 are evenly spaced, which can not only increase the oil intake and oil return, and improve the operational stability, but also the structure of the open grooves 111 has a certain symmetry, which is convenient for processing, and at the same time, it can alleviate the stress concentration caused by processing and improve the structural reliability.

[0046] The following is an explanation using a specific application scenario of the valve core 100 as an example. This embodiment also provides a hydraulic valve 200 , which includes a valve core 100 and a valve body 210 . The valve core 100 and the valve body 210 cooperate to realize the conduction or closing of the hydraulic valve 200 .

[0047] Figure 3Schematic diagram of the structure of the valve core 100 and the valve body 210 in a working condition. The valve body 210 includes a first end 213 and a second end 215 arranged opposite to each other. An assembly hole 211 is provided on the valve body 210 between the first end 213 and the second end 215. The valve core 100 is arranged in the assembly hole 211 and can move in the assembly hole 211. The valve body 210 is connected with a pump supply channel 220 and a cylinder channel 230 respectively. The pump supply channel 220 and the cylinder channel 230 are connected to the valve body 210 at intervals. The valve core 100 is used to open or close the pump supply channel 220 and the cylinder channel 230. Optionally, the end of the shaft end 120 of the valve core 100 away from the core body 110 is also provided with a supporting portion 130, and the supporting portion 130 cooperates with the assembly hole 211. According to the different shapes and structures of the valve body 210, the shapes of the assembly holes 211 are different, and the shapes of the supporting portion 130 are also different. The supporting portion 130 is close to the first end 213 of the valve body 210 and is connected to the operating end 243. The operating end 243 includes an operating handle, and the supporting portion 130 is used to receive the operating signal of the operating handle. Of course, in other optional embodiments, the supporting portion 130 can also be omitted, and the shaft end 120 of the valve core 100 is directly used to receive the operating signal of the operating handle, which is not specifically limited here. An elastic member 241 is provided between the end of the core body 110 away from the shaft end 120 and the second end 215 of the valve body 210. Optionally, the shaft end 120 of the valve core 100 is arranged close to the first end 213, and an elastic member 241 is provided between the end of the core body 110 away from the shaft end 120 and the second end 215. The elastic member 241 is a spring. Of course, the elastic member 241 can also be a spring or other elastic element.

[0048] like Figure 3 , the valve core 100 is in the middle position, the abutting portion 130 does not receive the operation signal, and under the action of the spring force, the abutting portion 130 abuts against the first end 213 of the valve body 210. At this time, the opening groove 111 on the core body 110 is located between the pump supply channel 220 and the cylinder channel 230, and the oil path between the pump supply channel 220 and the cylinder channel 230 is not conductive, that is, it is in a closed state. Figure 4 When the abutting portion 130 receives the operation signal, it pushes the valve core 100 to move rightward as a whole. Figure 4 The valve core 100 moves from the pump supply channel 220 to the cylinder channel 230, overcoming the elastic force of the spring. The spring is compressed, and the opening groove 111 on the core body 110 gradually moves to the cylinder channel 230. The hydraulic oil in the pump supply channel 220 gradually flows into the cylinder channel 230 through the opening groove 111. When the valve core 100 moves to the right to the maximum displacement, the opening groove 111 is completely located in the cylinder channel 230, and the hydraulic oil in the pump supply channel 220 flows into the cylinder channel 230 with the maximum oil inlet. At this time, the oil circuit between the pump supply channel 220 and the cylinder channel 230 is completely connected.

[0049] It should be noted that the movement process of the hydraulic valve 200 from closed to open, that is, the process of the valve core 100 moving to the right in this embodiment, can be divided into three stages. In the first stage n1, the core body 110 moves to the right until the end of the opening groove 111 away from the shaft end 120 just contacts the cylinder channel 230. At this time, the pump supply channel 220 and the cylinder channel 230 are still in a non-conductive state, and there is no oil inflow. In the second stage n2, the end of the opening groove 111 away from the shaft end 120 just contacts the cylinder channel 230 until the end of the opening groove 111 close to the shaft end 120 just contacts the cylinder channel 230. At this time, the pump supply channel 220 and the cylinder channel 230 are connected through the opening groove 111, and the oil inflow is determined by the shape of the opening groove 111 and the opening area of ​​the valve core 100. In the third stage n3, the end of the opening groove 111 close to the shaft end 120 just contacts the cylinder channel 230 to the maximum displacement of the valve core 100, and at this time, the pump supply channel 220 and the cylinder channel 230 are fully connected.

[0050] Figure 5 The curve relationship diagram of the displacement of the valve core 100 and the opening area of ​​the valve core 100 in the three stages is shown. In order to highlight the flow regulation effect of the opening groove 111 in the present application, two comparative groove structures are specially set, namely the first groove 101 and the second groove 103, wherein curve a is a curve relationship diagram of the displacement of the valve core 100 and the opening area of ​​the valve core 100 obtained under the first groove 101 structure of the existing first valve core 100, and the first groove 101 structure is a concave arc groove, such as Figure 6 and Figure 7 Curve b is a curve relationship diagram of the displacement of the valve core 100 and the opening area of ​​the valve core 100 obtained under the second groove 103 structure of the second type of existing valve core 100. The second groove 103 structure is a stepped groove, such as Figure 8 and Fig. 9 Curve c is a curve relationship diagram of the displacement of the valve core 100 and the opening area of ​​the valve core 100 obtained under the structure of the opening groove 111 provided in this embodiment, and the groove bottom of the opening groove 111 is a convex structure. It can be seen that the second stage n2 of the movement of the valve core 100 and the movement process from the second stage n2 to the third stage n3 are greatly related to the operability of the hydraulic valve 200.

[0051] The curve a shown by the existing first groove 101 structure shows that the opening area of ​​the valve core 100 has a large area change rate for the movement of the valve core 100, and there are obvious sharp points in the curve, which will cause a sense of frustration and unsmoothness during operation. Therefore, the groove structure leads to poor operability of the hydraulic excavator. The curve b shown by the existing second groove 103 structure shows that the opening area of ​​the valve core 100 presents a large amplitude wave-shaped stage change in the second stage n2, so the speed change of the working device of the hydraulic excavator also presents a stage change, and the operating performance is not high. It is easy to understand that in the prior art, whether it is the first groove 101 structure or the second groove 103 structure, when the valve core 100 moves from the second stage to the third stage, that is, when the end face of the core body 110 close to the shaft end 120 passes through the cylinder channel 230, the opening area change rate of the valve core 100 increases sharply, and the operator can feel the rapid change of the speed during operation, so it is necessary to further improve the operability in the existing technology, and the improvement is very limited. When two or more working devices are operated in combination at the same time, multiple cylinder channels 230 are connected to the pump supply channel 220 respectively, and a valve core 100 is provided between each cylinder channel 230 and the pump supply channel 220 respectively, and hydraulic oil is supplied from the common pump supply channel 220 to each cylinder channel 230 through each valve core 100. In the existing grooving structure technology, the opening area characteristics of the valve core 100 are shown in curves a and b, and the movement process from the second stage n2 to the third stage n3 is discontinuous. Therefore, in terms of operability, it is very difficult to operate two or more compound actions smoothly and softly.

[0052] The valve core 100 provided in this embodiment has an opening groove 111 structure that is convex in a parabolic shape. After the operator sends an operation signal through the operating handle, the valve core 100 moves in the valve body 210, which can change the variable opening of the valve core 100. In addition, the structure of the opening groove 111 changes with the movement of the valve core 100. During the opening process of the valve core 100, the width of the opening groove 111 increases with the increase in the movement of the valve core 100. At the same time, the depth of the groove bottom is deepened in a convex parabolic curve. As a result, the opening shape of a certain width and depth is formed near the beginning of the opening groove 111 of the valve core 100, such as Figure 1 As shown, the opening area A of the valve core 100 and the displacement X follow the following relationship A=f(X 3 ), as shown by curve c, the entire curve has a smooth transition without obvious sharp points or inflection points, and there is no sense of frustration during operation, which can greatly improve the operability of the hydraulic excavator.

[0053] Optionally, this embodiment further provides a valve core 100 processing method, which is used to process the valve core 100 in this embodiment. Fig.10, the arrow in the figure indicates the moving path of the processing tool 160; the processing method of the opening groove 111 on the valve core 100 can be: the processing tool 160 moves along the outer circumference of the valve core 100 to the end face of the valve core 100 in a convex curve path, and rotates around the axis of the processing tool 160 itself during the movement to form the opening groove 111. Further, the convex curve in the moving path is a parabolic path. In this way, the processing of the opening groove 111 can be achieved more easily. The opening groove 111 formed in this way is a curve in which the width of the slot becomes wider as the movement amount of the valve core 100 increases, and at the same time the slot depth changes to a convex curve, and the convex curve includes but is not limited to an arc or a parabola, that is, it is similar to a square convex curve. Therefore, the opening area A of the valve core 100 can be expressed as a continuous curve of more than the cube of X relative to the above-mentioned movement amount X of the valve core 100, as shown in curve c. When the opening groove 111 of the valve core 100 has a small movement amount, the change rate of the opening area of ​​the valve core 100 is small, and as the movement amount of the valve core 100 increases, it is easy to achieve smooth and continuous area change during the change from the second stage n2 to the third stage n3. In addition, although the groove bottom shape of the opening groove 111 in this embodiment is a convex curve, a similar shape composed of multiple short straight lines can also achieve the same adjustment effect, which is not specifically limited here.

[0054] It is easy to understand that during the opening of the valve core 100, the oil inlet amount can be smoothly adjusted through the opening groove 111, and during the closing of the valve core 100, the oil return amount can also be smoothly adjusted through the opening groove 111. Therefore, the valve core 100 provided in this embodiment can improve the operability problems existing in the prior art, and can greatly improve the operability of a single or compound action of a hydraulic excavator, thereby greatly improving the operability of the entire machine.

[0055] The embodiment of the present invention further provides an excavator, comprising a hydraulic valve 200 as in the aforementioned embodiment, the hydraulic valve 200 comprising a valve body 210 and a valve core 100 as in the aforementioned embodiment, the valve core 100 being installed in the valve body 210. An opening groove 111 is provided on the valve core 100, the bottom of the opening groove 111 is convex, the width of the opening groove 111 gradually increases with the displacement of the valve core 100 during the opening process of the valve core 100, and the depth of the opening groove 111 gradually increases with the displacement of the valve core 100 during the opening process of the valve core 100. The operability of the single or compound action of the excavator is good, which greatly improves the operability of the whole machine and enhances the operating experience of the operator.

[0056] In summary, the embodiment of the present invention provides a valve core 100, a hydraulic valve 200, a valve core 100 processing method and an excavator. Since the valve core 100 is provided with an opening groove 111, the width and depth of the opening groove 111 increase with the increase of the displacement of the valve core 100, and the bottom of the opening groove 111 is convex, so that the opening shape of a certain width and depth is provided near the beginning of the opening groove 111 of the valve core 100, and as the displacement of the valve core 100 increases, it is easy to achieve smooth and continuous area changes in the process of changing from the second stage n2 to the third stage n3. It is conducive to greatly improving the operability of a single or compound action of a hydraulic excavator, thereby greatly improving the operability of the entire machine.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A valve core, characterized in that: Applied to a valve body (210); an opening groove (111) is provided on the valve core (100); the bottom of the opening groove (111) is convex; the width of the opening groove (111) gradually increases as the displacement of the valve core (100) increases during the opening process of the valve core (100); and the depth of the opening groove (111) gradually increases as the displacement of the valve core (100) increases during the opening process of the valve core (100); The bottom of the open groove (111) is parabolic convex; The opening area of ​​the valve core (100) is A, and the displacement of the valve core (100) during the opening process is X, where: A=f(X 3 ); There are a plurality of opening grooves (111), and the plurality of opening grooves (111) are evenly distributed on the valve core (100).

2. The valve core according to claim 1, characterized in that: The valve core (100) comprises a core body (110) and an axial end (120) arranged at the end of the core body (110), wherein the diameter of the axial end (120) is smaller than the diameter of the core body (110); and the opening groove (111) is provided on the core body (110).

3. The valve core according to claim 2, characterized in that: The open groove (111) extends from the outer peripheral surface of the core body (110) to the end surface of the core body (110) close to the shaft end (120).

4. A valve core processing method, characterized in that: Used for machining the valve core (100) according to any one of claims 1 to 3; the machining tool (160) moves along the outer circumference of the valve core (100) toward the end surface of the valve core (100) in a convex curved path, and rotates around the axis of the machining tool (160) during the movement to machine and form the opening groove (111); In the step of moving the machining tool (160) along the outer circumference of the valve core (100) toward the end surface of the valve core (100) in a convex curve path, the convex curve is a parabola.

5. A hydraulic valve, characterized in that: The invention comprises a valve body (210) and a valve core (100) according to any one of claims 1 to 3, wherein the valve core (100) is installed in the valve body (210).

6. An excavator, characterized in that: Comprising the hydraulic valve (200) as claimed in claim 5.

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