阅读说明：本技术 阀芯、阀芯加工方法、液压阀和挖掘机 (Valve core, valve core machining method, hydraulic valve and excavator ) 是由 松本哲 王博 王瑞 陆爱华 朱彪 于 2020-07-24 设计创作，主要内容包括：本发明的实施例提供了一种阀芯、阀芯加工方法、液压阀和挖掘机,涉及液压阀制造技术领域。该阀芯上设有开口槽,开口槽的槽底呈凸状,开口槽的宽度在阀芯开启过程中随阀芯的位移量增大而逐渐变大,开口槽的深度在阀芯开启过程中随阀芯的位移量增大而逐渐变大。该阀芯在阀体中移动时,能改变阀芯的开口槽的流量,使得流量变化更加平稳,从而改善挖掘机的操作性。(The embodiment of the invention provides a valve core, a valve core machining method, a hydraulic valve and an excavator, and relates to the technical field of hydraulic valve manufacturing. The valve core is provided with an open slot, the slot bottom of the open slot is convex, the width of the open slot is gradually increased along with the increase of the displacement of the valve core in the opening process of the valve core, and the depth of the open slot is gradually increased along with the increase of the displacement of the valve core in the opening process of the valve core. When the valve core moves in the valve body, the flow of an open slot of the valve core can be changed, so that the flow change is more stable, and the operability of the excavator is improved.)

1. A valve cartridge, characterized by being applied to a valve body (210); the valve core (100) is provided with an open groove (111), the groove bottom of the open groove (111) is convex, the width of the open groove (111) is gradually increased along with the increase of the displacement of the valve core (100) in the opening process of the valve core (100), and the depth of the open groove (111) is gradually increased along with the increase of the displacement of the valve core (100) in the opening process of the valve core (100).

2. The valve cartridge according to claim 1, wherein the groove bottom of the open groove (111) is parabolically convex.

3. The valve cartridge according to claim 1, wherein the valve cartridge (100) has an opening area a and the valve cartridge (100) has a displacement X during opening, wherein: a ═ f (X)³)。

4. The valve cartridge according to claim 1, wherein the valve cartridge (100) comprises a core (110) and a shaft end (120) provided at an end of the core (110), the shaft end (120) having a diameter smaller than that of the core (110); the core body (110) is provided with the open slot (111).

5. The valve cartridge according to claim 4, wherein the open groove (111) extends from an outer peripheral surface of the core body (110) to an end surface of the core body (110) near the shaft end (120).

6. The valve cartridge according to claim 4, wherein the number of the open grooves (111) is plural, and the plural open grooves (111) are uniformly distributed on the core body (110).

7. A method for machining a valve cartridge, characterized by machining a valve cartridge (100) according to any one of claims 1 to 6; the machining tool (160) moves along the end face, facing the valve core (100), of the outer periphery of the valve core (100) in a convex curve path and rotates around the axis of the machining tool (160) during moving so as to machine and form the open slot (111).

8. The valve core machining method according to claim 7, wherein in the step of moving the machining tool (160) along a path of a convex curve along an outer peripheral surface of the valve core (100) toward an end surface of the valve core (100), the convex curve is a parabola.

9. A hydraulic valve comprising a valve body (210) and a valve cartridge (100) according to any one of claims 1 to 6, the valve cartridge (100) being mounted within the valve body (210).

10. An excavator, comprising a hydraulic valve (200) according to claim 9.