Compact in-line adaptive pressure regulating valve

Abstract

The application relates to a self-adaptive pressure regulating valve for a static pressure support bearing (platform) of high-precision numerical control machining equipment, in particular to a compact embedded self-adaptive pressure regulating valve, which comprises a valve core, a valve sleeve, a spring and a cover plate; the whole structure is compact, can be installed in a support table of the static pressure support bearing in a plug-in mode, is convenient to manufacture and install, is convenient to replace, reduces the volume of the related parts of the support table; meanwhile, the throttling effect of the gap throttling part is obvious, the throttling length is very easy to adjust, the flow rate can be well changed through the timely adjustment of the throttling length, and the effect of regulating effective oil supply is achieved; meanwhile, the self-feedback regulation function of the pressure change of the upper cavity of the valve core is realized by the pressure change of the upper and lower cavities, the flow-through and throttling effects of the convex shoulder I of the valve sleeve and the self-control of the discharge flow rate of the oil discharge port.

Description

Technical Field

[0001] This invention relates to an adaptive pressure regulating valve used in hydrostatic and hydrostatic support bearings (platforms), which are important core components in high-precision CNC machining equipment, and particularly to a compact embedded adaptive pressure regulating valve. Background Technology

[0002] Hydrostatic tables are a crucial component in CNC machine tool machining. Their dynamic and static characteristics determine the quality and precision of machining. Improving the working stability of machine tool tables has significant engineering and application value for the manufacturing industry. However, due to the relatively low level of industrialization of hydrostatic tables, their performance cannot fully meet market demands, especially for precision, high-load-bearing tables. The performance of these tables is significantly affected by load changes and cannot adaptively adjust. Currently, achieving high precision and high load-bearing capacity mainly relies on optimizing the oil chamber structure parameters to ensure stable oil film stiffness under varying external loads. This inevitably leads to higher costs and greater operational complexity. Therefore, improving the stability control level of rotary tables during operation remains a pressing need in the heavy-duty rotary machining field. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a compact embedded adaptive pressure control valve that is compact in mechanical structure, simple to implement, and can realize the movement of the valve core by its own structure and force changes, while also being able to make a rapid dynamic response to changes in the external load on the hydrostatic support workbench.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a compact embedded adaptive pressure regulating valve, comprising: a valve core, a valve sleeve, spring I, spring II, and a cover plate; characterized in that: the valve core is in close sliding contact with the areas where the valve sleeve shoulder I and valve sleeve shoulder II are located, and a slit flow channel is opened between the middle part of the valve core and the valve sleeve, which has a significant throttling effect. By adjusting the throttling length in a timely manner, the flow rate can be effectively changed, thereby achieving the effect of regulating effective oil supply; spring I is placed in the oil chamber II of the regulating valve, and spring II is placed in the oil chamber I of the regulating valve, which can provide good buffering when the valve core moves up and down in the valve sleeve. The effect effectively avoids unstable valve core movement. Simultaneously, in the initial working state of the valve, double springs center the valve core vertically. The cover plate and valve sleeve are fixedly connected by screws. The cover plate has a conical groove. When the conical column structure above the valve core moves up and down within the conical groove of the cover plate, it can also control the flow rate in oil chamber I. This allows for continuous oil flow in oil chamber I while simultaneously regulating the pressure within oil chamber I, thereby regulating the downward pressure applied to the valve core. Furthermore, when the conical column of the valve core is fully engaged with the conical groove of the cover plate, spring II still has compressible margin. Similarly, when the lower end of oil chamber III of the valve core is compressed to its limit position, spring I still has compressible margin.

[0005] Preferably, the compact embedded adaptive pressure regulating valve has an oil guide hole A1, an oil guide hole A2, an oil guide hole B, an oil guide hole C, and an oil guide hole D on the valve core, and an oil inlet P and an oil outlet T on the valve sleeve. When the external load of the hydrostatic workbench suddenly increases, the oil pressure in the oil chamber III increases accordingly. The valve core moves upward, the spring II is compressed, and the flow rate of the guide hole B, which contacts the valve sleeve shoulder I, decreases. Consequently, the amount of oil entering the oil chamber I through the guide holes A1 and A2 also decreases, the flow area of ​​the tapered groove of the cover plate decreases, and the pressure in the oil chamber I decreases. At the same time, the throttling length of the slit flow channel shortens. According to the throttling principle, the amount of oil entering the oil chamber II increases in the same amount of time. The oil enters the oil chamber III through the guiding action of the guide holes C and D, thereby increasing the pressure in the oil chamber III. In response to changes in the worktable, the static pressure working platform is stabilized. At this time, the valve core stops working and maintains a dynamic balance. When the external load on the static pressure working platform suddenly decreases, the pressure in oil chamber III decreases accordingly. The valve core moves downward, spring I is compressed, and the flow rate of guide hole B, which contacts the valve sleeve shoulder I, increases. Consequently, the amount of oil entering oil chamber I through guide holes A1 and A2 also increases, and the flow area of ​​the tapered groove of the cover plate also increases. The pressure in oil chamber I increases, and at the same time, the throttling length of the slit flow channel becomes longer. According to the throttling principle of the slit, the amount of oil entering oil chamber II in the same time decreases. The oil enters oil chamber III through the guiding action of guide holes C and D, thereby reducing the pressure in oil chamber III. To adapt to the changes in the worktable, the static pressure working platform is stabilized. At this time, the valve core stops working and maintains a dynamic balance.

[0006] Preferably, the compact embedded adaptive pressure regulating valve has external threads on the outer cylindrical surface of the valve sleeve, which facilitates external installation and sealing of the valve body during use.

[0007] The beneficial effects of this invention are:

[0008] The compact embedded adaptive pressure control valve of this invention features a novel feedback oil circuit design that autonomously and actively adapts to changes in the external load of the hydrostatic worktable. The feedback process involves a small geometric distance and requires a short time, enabling a very rapid response to changes in the external load on the hydrostatic worktable. This is crucial for maintaining the stability of the hydrostatic bearing oil film thickness, stiffness, and consistency after external load interference, thereby effectively improving the dynamic and static stiffness of the entire hydrostatic worktable and the stiffness of the hydrostatic support, thus ensuring the motion accuracy of the worktable or the machining accuracy of the workpiece.

[0009] The compact embedded adaptive pressure regulating valve of this invention has a compact overall structure and can be installed in the support platform of the hydrostatic support bearing in a cartridge manner. It is easy to manufacture, install, and replace, and reduces the volume of the relevant parts of the support platform. At the same time, the throttling effect at the slit throttling point is obvious, and the throttling length is very easy to adjust. By adjusting the throttling length in a timely manner, the flow rate can be effectively changed, thereby achieving the effect of regulating the oil supply. Meanwhile, the autonomous feedback adjustment function of the pressure change in the upper chamber of the valve core can be easily realized by the autonomous control of the pressure changes in the upper and lower chambers, the flow and throttling effect at the valve sleeve shoulder I, and the discharge flow rate at the oil discharge port.

[0010] Compared to other existing structures, the compact embedded adaptive pressure regulating valve of this invention has a simpler overall structure, fewer internal parts, and is easier to manufacture. At the same time, its mechanical structure is isolated from the high-speed rotating part of the hydrostatic support bearing, effectively avoiding the high linear velocity shearing of the oil by the high-speed mechanical rotation, thereby avoiding oil film failure caused by the oil temperature rising too quickly and not having enough time to conduct heat. This effectively ensures the stable and reliable operation of the hydrostatic support bearing and its worktable. Attached Figure Description

[0011] Appendix Figure 1 A schematic diagram of the overall assembly of the control valve of the present invention;

[0012] Appendix Figure 2 A schematic diagram of the valve core structure of the present invention;

[0013] Appendix Figure 3 A schematic diagram of the cover plate structure of the present invention;

[0014] Appendix Figure 4A schematic diagram of the working principle structure of the hydrostatic support workbench of the present invention;

[0015] In the picture:

[0016] 1. Valve core, 2. Valve sleeve, 3. Spring I, 4. Spring II, 5. Cover plate. Detailed Implementation

[0017] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a compact embedded adaptive pressure regulating valve includes: a valve core 1, a valve sleeve 2, a spring I 3, a spring II 4, and a cover plate 5; characterized in that: the valve core 1 has a tight sliding fit with the areas where the shoulders I and II of the valve sleeve 2 are located, and a slit flow channel is opened between the middle part of the valve core 1 and the valve sleeve 2, which has a significant throttling effect. By adjusting the throttling length in a timely manner, the flow rate can be effectively changed, thereby achieving the effect of regulating the effective oil supply; spring I 3 is placed in the oil chamber II of the regulating valve, and spring II 4 is placed in the oil chamber I of the regulating valve. When the valve core 1 moves up and down in the valve sleeve 2, it can play a good buffering role, effectively preventing valve... The valve core 1 exhibits unstable movement. Simultaneously, in the initial working state of the valve, double springs are used to center the valve core 1 vertically. The cover plate 5 and valve sleeve 2 are fixedly connected by screws. The cover plate 5 has a conical groove. When the conical column structure above the valve core 1 moves up and down within the conical groove of the cover plate 5, it can also control the flow rate within the oil chamber I. This allows for continuous flow of oil in the oil chamber I while simultaneously regulating the pressure within the oil chamber I, thereby adjusting the downward pressure applied to the valve core 1. Furthermore, when the conical column of the valve core 1 is fully engaged with the conical groove of the cover plate 5, spring II 4 still has compressible margin. Similarly, when the lower end of the oil chamber III of the valve core 1 is compressed to its limit position, spring I 3 still has compressible margin.

[0018] like Figure 1 , Figure 2 , Figure 4As shown, a compact embedded adaptive pressure regulating valve has a valve core 1 with oil guide holes A1, A2, B, C, and D, and a valve sleeve 2 with an oil inlet P and an oil outlet T. When the external load on the hydrostatic workbench suddenly increases, the oil pressure in oil chamber III increases accordingly. The valve core 1 moves upward, the spring II 4 is compressed, and the flow rate of the guide hole B, which contacts the shoulder I of the valve sleeve 2, decreases. Consequently, the amount of oil entering oil chamber I through guide holes A1 and A2 also decreases, and the flow area of ​​the conical groove of the cover plate 5 decreases. The pressure in oil chamber I decreases, and at the same time, the throttling length of the slit flow channel shortens. According to the throttling principle, the amount of oil entering oil chamber II increases in the same time period. The oil enters oil chamber III through the guiding action of guide holes C and D, thereby increasing the pressure in oil chamber III. The change in the worktable stabilizes the hydrostatic working platform. At this time, valve core 1 stops working and maintains a dynamic balance. When the external load on the hydrostatic working platform suddenly decreases, the pressure in oil chamber III decreases accordingly. Valve core 1 moves downward, spring I3 is compressed, and the flow rate of guide hole B, which contacts the shoulder I of valve sleeve 2, increases. Consequently, the amount of oil entering oil chamber I through guide holes A1 and A2 also increases, and the flow area of ​​the conical groove of cover plate 5 also increases. The pressure in oil chamber I increases, and at the same time, the throttling length of the slit flow channel becomes longer. According to the throttling principle of slits, the amount of oil entering oil chamber II in the same time decreases. The oil enters oil chamber III through the guiding action of guide holes C and D, thereby reducing the pressure in oil chamber III to adapt to the change in the worktable and stabilize the hydrostatic working platform. At this time, valve core 1 stops working and maintains a dynamic balance.

[0019] like Figure 1 As shown, the compact embedded adaptive pressure regulating valve has external threads on the outer cylindrical surface of the valve sleeve 2, which facilitates external installation and sealing of the valve body during use.

[0020] The above description is only one 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 conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the protection scope of the present invention.

[0021] The parts of this invention not described in detail are common knowledge to those skilled in the art.

Claims

1. A compact, embedded adaptive pressure regulating valve, comprising: Valve core (1), valve sleeve (2), spring I (3), spring II (4), cover plate (5); characterized in that: the valve core (1) is in close sliding fit with the areas where the shoulder I and shoulder II of the valve sleeve (2) are located respectively; a gap flow channel is opened between the middle part of the valve core (1) and the valve sleeve (2); the throttling effect of the gap flow channel is obvious; the flow rate can be changed well by timely adjustment of the throttling length, thereby achieving the effect of regulating effective oil supply; spring I (3) is placed in the oil chamber II of the regulating valve; spring II (4) is placed in the oil chamber I of the regulating valve; when the valve core (1) moves up and down in the valve sleeve (2), it can play a good buffering effect, effectively avoiding the phenomenon of unstable movement of the valve core (1); at the same time, double springs are used in the initial working state of the valve. The upper and lower center valve core (1), cover plate (5) and valve sleeve (2) are fixedly connected by screws. The cover plate (5) has a conical groove. When the conical column structure above the valve core (1) moves up and down in the conical groove of the cover plate (5), it can also control the flow rate in the oil chamber I. In this way, the oil can flow continuously in the oil chamber I while adjusting the pressure in the oil chamber I, thereby adjusting the pressure applied downward to the valve core (1). At the same time, when the conical column of the valve core (1) is fully engaged with the conical groove of the cover plate (5), the spring II (4) still has compressible margin. Similarly, when the lower end oil chamber III of the valve core (1) is compressed to the limit position, the spring I (3) still has compressible margin. The valve core (1) has a guide hole A1, a guide hole A2, a guide hole B, a guide hole C and a guide hole. The valve sleeve (2) has an inlet port P and an outlet port T. When the external load on the static pressure workbench suddenly increases, the oil pressure in the oil chamber Ⅲ increases accordingly. The valve core (1) moves upward, the spring Ⅱ (4) is compressed, the flow rate of the guide hole B that contacts the shoulder Ⅰ of the valve sleeve (2) decreases, and the oil entering the oil chamber Ⅰ through the guide holes A1 and A2 also decreases accordingly. The flow area of ​​the tapered groove of the cover plate (5) also decreases, the pressure in the oil chamber Ⅰ decreases, and the throttling length of the slit flow channel becomes shorter. According to the throttling principle of the slit, the amount of oil entering the oil chamber Ⅱ increases in the same time. The oil enters the oil chamber Ⅲ through the guiding action of the guide hole C and the guide hole D, and the pressure in the oil chamber Ⅲ increases to adapt to the changes in the workbench, so that the static pressure workbench is stable. At this time, the valve core (1) stops working. When the load on the static pressure workbench suddenly decreases, the pressure in the oil chamber Ⅲ decreases accordingly, the valve core (1) moves downward, the spring Ⅰ (3) is compressed, the flow rate of the guide hole B that contacts the shoulder Ⅰ of the valve sleeve (2) increases, and the oil entering the oil chamber Ⅰ through the guide holes A1 and A2 also increases accordingly. The flow area of ​​the tapered groove of the cover plate (5) also increases, the pressure in the oil chamber Ⅰ increases, and at the same time the throttling length of the slit flow channel becomes longer. According to the throttling principle of the slit, the amount of oil entering the oil chamber Ⅱ in the same time decreases. The oil enters the oil chamber Ⅲ through the guiding effect of the guide hole C and the guide hole D, and the pressure in the oil chamber Ⅲ decreases to adapt to the change of the workbench, so that the static pressure workbench is stable. At this time, the valve core (1) stops working and maintains a dynamic balance.

2. The compact embedded adaptive pressure regulating valve according to claim 1, characterized in that: The outer cylindrical surface of the valve sleeve (2) has external threads, which facilitates the external installation and sealing of the valve body during use.

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