Constant-pressure control spherical valve element surface precision polishing device

Abstract

The utility model provides a constant-pressure-controlled spherical valve element surface precise polishing device, which belongs to the technical field of polishing and comprises a machine tool module, a Y-axis transmission component, a first X-axis moving mechanism, a second X-axis moving mechanism, a constant-pressure module and a liquid conveying component. The machine tool module comprises a rotating table and a base, and the spherical valve element is installed on the rotating table. The Y-axis transmission assembly is fixed on the base; the first X-axis moving mechanism comprises an X-axis transmission bottom plate and a first X-axis transmission assembly, the X-axis transmission bottom plate is connected with the moving end of the Y-axis transmission assembly, and the first X-axis transmission assembly is fixed to the X-axis transmission bottom plate; the constant-pressure module, the first X-axis moving mechanism and the second X-axis moving mechanism are combined for use, the consistency of the polishing strength in the polishing process is ensured, grinding liquid is sprayed to the machining surface of the spherical valve element through the liquid conveying assembly, and therefore the polishing quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of polishing, and particularly relates to a precision polishing device for the surface of a spherical valve core with constant pressure control. Background Technique

[0002] With the improvement of the processing technology of ball valve products in China, the application of ball valve devices is increasing, gradually replacing the original electric plug switches. As an important component in the medium flow link, electric ball valves are widely used in industries such as electric power, water conservancy, chemical industry, oil and gas, and metallurgy due to their advantages of small fluid resistance, convenient operation, rapid opening and closing, good airtightness, and high reliability. The requirements for the size, shape accuracy, and surface roughness of the turning and grinding of metal-sealed ball valves are very high, and the processing difficulty is large. Moreover, after surface treatment, the shape accuracy and roughness cannot meet the accuracy requirements. Therefore, it is necessary to not only study and solve the key technical problems of the processing of spherical valve cores but also solve the technical problems of grinding after surface treatment.

[0003] In the patent application with the application number 202323134628.4, a polishing device for a high-pressure ball valve body is proposed. Through the action of a clamping device and an auxiliary device, this application achieves the clamping and fixing of valve bodies of different sizes, facilitates the polishing of different angles of the valve body by a polishing mechanism, improves the efficiency of the valve body polishing operation, and at the same time, absorbs the dust generated during polishing. However, in the prior art, it is difficult to accurately control the magnitude of the polishing force, so the phenomenon of uneven polishing or damage to the workpiece surface may occur. Content of the Utility Model

[0004] Based on the above technical problems, the utility model provides a precision polishing device for the surface of a spherical valve core with constant pressure control. By combining the use of a constant pressure module, a first X-axis moving mechanism, and a second X-axis moving mechanism, this application ensures the consistency of the polishing force during the polishing process and uses an infusion component to spray the grinding fluid on the processing surface of the spherical valve core, thereby improving the quality of polishing.

[0005] Its specific technical solution is as follows:

[0006] A precision polishing device for the surface of a spherical valve core with constant pressure control, comprising: a machine tool module, a Y-axis drive assembly, a first X-axis moving mechanism, a second X-axis moving mechanism, a constant pressure module, and an infusion assembly; the machine tool module includes a rotating table and a base, and the spherical valve core is installed on the rotating table; the Y-axis drive assembly is fixed on the base; the first X-axis moving mechanism includes an X-axis drive bottom plate and a first X-axis drive assembly, the X-axis drive bottom plate is connected to the moving end of the Y-axis drive assembly, and the first X-axis drive assembly is fixed on the X-axis drive bottom plate; the second X-axis moving mechanism includes an X-axis sliding bottom plate and a second X-axis drive assembly, the X-axis sliding bottom plate is connected to the moving end of the first X-axis drive assembly, and the second X-axis drive assembly is fixed on the X-axis sliding bottom plate; the constant pressure module includes a power component, a pressure sensor, and a grinding tool, the power component is connected to the moving end of the second X-axis drive assembly, the pressure sensor is arranged on the top surface of the X-axis sliding bottom plate and is opposite to the position of the power component, and the output end of the power component is connected to the grinding tool through a coupling assembly; the infusion assembly includes a grinding fluid inlet, a grinding fluid delivery pipe, and a hose, one end of the power component is provided with the grinding fluid inlet, the grinding fluid delivery pipe is installed at the output end of the power component and is communicated with the grinding fluid inlet, one end of the hose is connected to the grinding fluid delivery pipe, and the other end of the hose is connected to the grinding tool through a coupling assembly.

[0007] In addition, a precision polishing device for the surface of a spherical valve core with constant pressure control in the above technical solution provided by the present utility model may further have the following additional technical features:

[0008] In the above technical solution, the Y-axis drive assembly includes: a first motor, a first slide rail, a first lead screw, and a first slider; the first motor is fixed on the base; the first slide rail is fixed on the base; the first lead screw is arranged on the first slide rail, and the first lead screw is connected to the output end of the first motor; a threaded hole is provided in the first slider, the threaded hole of the first slider is sleeved outside the first lead screw, the first slider is slidably connected to the first slide rail, and the X-axis drive bottom plate is connected to the first slider.

[0009] In the above technical solution, the first X-axis drive assembly includes: a second motor, a second slide rail, a second lead screw, and a second slider; the second motor is fixed on the X-axis drive bottom plate; the second slide rail is fixed on the X-axis drive bottom plate; the second lead screw is arranged on the second slide rail, and the second lead screw is connected to the output end of the second motor; a threaded hole is provided in the second slider, the threaded hole of the second slider is sleeved outside the second lead screw, and the second slider is slidably connected to the second slide rail, and the X-axis sliding bottom plate is connected to the second slider.

[0010] In the above technical solution, the second X-axis drive assembly includes: a third slide rail and a third slider; the third slide rail is fixed on the X-axis sliding bottom plate; the third slider is connected to the third slide rail, and the power component is fixed on the third slider.

[0011] In the above technical solution, the power component includes: a third motor and a speed reducer; the third motor is fixed on the third slider through a motor base plate, and the pressure sensor is opposite to the position of the third motor; the speed reducer is fixed on the third slider, the speed reducer is connected to the output end of the third motor, and the output end of the speed reducer is connected to the grinding tool through a coupling component.

[0012] In the above technical solution, the coupling component includes: a flexible coupling and a threaded stepped shaft; one end of the flexible coupling is connected to the output end of the speed reducer; one end of the threaded stepped shaft is connected to the other end of the flexible coupling, and the other end of the threaded stepped shaft is connected to the grinding tool through a fixing nut; wherein, the flexible coupling, the threaded stepped shaft and the fixing nut are all hollow structures, and the grinding fluid delivery pipe and the hose respectively pass through the flexible coupling, the threaded stepped shaft and the fixing nut in sequence and are connected to the grinding tool in communication.

[0013] In the above technical solution, the grinding tool is of a bowl-shaped structure, and a grinding tool profiling surface is provided at the edge of the grinding tool in contact with the spherical valve core, and an annular groove is provided at the middle position of the grinding tool profiling surface.

[0014] A precision polishing device for the surface of a ball valve core with constant pressure control according to the present utility model has the following beneficial effects compared with the prior art:

[0015] 1. By controlling the X-axis sliding base plate to move towards the spherical valve core through the first X-axis moving mechanism, the grinding tool is brought into contact with the spherical valve core, and the grinding fluid is sprayed onto the processing surface of the spherical valve core through the grinding fluid delivery pipe and the hose, thereby improving the quality of polishing the spherical valve core.

[0016] 2. By combining the use of the constant pressure module, the first X-axis moving mechanism and the second X-axis moving mechanism, the first X-axis moving mechanism is controlled to move the grinding tool, so that the grinding tool and the spherical valve core are in contact and generate a grinding pressure, and the pressure sensor is used to detect the pressure, and then the first X-axis moving mechanism is controlled to feed or retreat according to the pressure value, thereby realizing the automatic adjustment of the polishing pressure and ensuring the consistency of the polishing force, and avoiding the occurrence of uneven polishing or damage to the surface of the spherical valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of a precision polishing device for the surface of a ball valve core with constant pressure control according to the present utility model;

[0018] Figure 2 is the structural schematic diagram of the first X-axis moving mechanism, the second X-axis moving mechanism and the constant pressure module of the present utility model;

[0019] Figure 3 is the cross-sectional view of the grinding tool of the present utility model;

[0020] Figure 4 is the cross-sectional view of the spherical valve core of the present utility model;

[0021] Among them, Figures 1 to 4 The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0022] 10 Rotary table, 11 Base, 12 X-axis drive base plate, 13 X-axis sliding base plate, 14 Pressure sensor, 15 Abrasive grinding fluid inlet, 16 Grinding fluid delivery pipe, 17 Hose, 18 First motor, 19 First slide rail, 20 First lead screw, 21 Spherical valve core, 22 Second motor, 23 Second slide rail, 24 Second slider, 25 Third slide rail, 26 Third slider, 27 Third motor, 28 Reducer, 29 Flexible coupling, 30 Threaded stepped shaft, 31 Fixed nut, 32 Abrasive, 33 Abrasive profiling surface, 34 Annular groove, 35 Connecting shaft, 36 Nut. Detailed implementation manners

[0023] The following further describes the present utility model in conjunction with specific implementation cases and attached Figures 1-4 drawings, but the present utility model is not limited to these embodiments.

[0024] A precision polishing device for the surface of a spherical valve core 21 with constant pressure control, as Figures 1-4 shown, includes: a machine tool module, a Y-axis drive assembly, a first X-axis moving mechanism, a second X-axis moving mechanism, a constant pressure module, and an infusion assembly; the machine tool module includes a rotary table 10 and a base 11, and the spherical valve core 21 is installed on the rotary table 10; the Y-axis drive assembly is fixed on the base 11; the first X-axis moving mechanism includes an X-axis drive base plate 12 and a first X-axis drive assembly, the X-axis drive base plate 12 is connected to the moving end of the Y-axis drive assembly, and the first X-axis drive assembly is fixed on the X-axis drive base plate 12; the second X-axis moving mechanism includes an X-axis sliding base plate 13 and a second X-axis drive assembly, the X-axis sliding base plate 13 is connected to the moving end of the first X-axis drive assembly, and the second X-axis drive assembly is fixed on the X-axis sliding base plate 13; the constant pressure module includes a power assembly, a pressure sensor 14, and an abrasive 32, the power assembly is connected to the moving end of the second X-axis drive assembly, the pressure sensor 14 is arranged on the top surface of the X-axis sliding base plate 13 and is opposite to the position of the power assembly, and the output end of the power assembly is connected to the abrasive 32 through a coupling assembly; the infusion assembly includes a grinding fluid inlet, a grinding fluid delivery pipe 16, and a hose 17, one end of the power assembly is provided with a grinding fluid inlet, the grinding fluid delivery pipe 16 is installed at the output end of the power assembly and is communicated with the grinding fluid inlet, one end of the hose 17 is communicated with the grinding fluid delivery pipe 16, and the other end of the hose 17 is connected to the abrasive 32 through a coupling assembly.

[0025] The X-axis sliding base plate 13 is controlled by the first X-axis moving mechanism to move towards the spherical valve core 21, so that the grinding tool 32 contacts the spherical valve core 21, and the grinding fluid is sprayed onto the processing surface of the spherical valve core 21 through the grinding fluid delivery pipe 16 and the hose 17, thereby improving the quality of polishing the spherical valve core 21; and by using the constant pressure module, the first X-axis moving mechanism and the second X-axis moving mechanism in combination, the first X-axis moving mechanism is enabled to control the movement of the grinding tool 32, so that the grinding tool 32 contacts the spherical valve core 21 and generates a grinding pressure, and the pressure sensor 14 is used to detect the pressure, thereby controlling the first X-axis moving mechanism to feed or retreat according to the pressure value, and further achieving the purpose of automatically adjusting the polishing pressure and ensuring the consistency of the polishing force, and avoiding the occurrence of uneven polishing or damage to the surface of the spherical valve core 21.

[0026] Specifically, through holes are provided at both the upper and lower ends of the spherical valve core 21. The connecting shaft 35 with external threads passes through the through hole of the spherical valve core 21, and a nut 36 is installed at the external thread of the connecting shaft 35, thereby clamping the spherical valve core 21, playing a role in clamping the spherical valve core 21, and the other end of the connecting shaft 35 is installed on the rotating table 10 to achieve the purpose of controlling the rotation of the spherical valve core 21.

[0027] In the embodiment of the present utility model, as Figure 1 shown, the Y-axis transmission assembly includes: a first motor 18, a first slide rail 19, a first lead screw 20, and a first slider; the first motor 18 is fixed on the base 11; the first slide rail 19 is fixed on the base 11; the first lead screw 20 is arranged on the first slide rail 19, and the first lead screw 20 is connected to the output end of the first motor 18; a threaded hole is provided inside the first slider, the threaded hole of the first slider is sleeved outside the first lead screw 20, the first slider is slidably connected to the first slide rail 19, and the X-axis transmission base plate 12 is connected to the first slider.

[0028] The first motor 18 is controlled to rotate the first lead screw 20, so that the first slider drives the X-axis transmission base plate 12 to move left and right along the first lead screw 20, and the first slide rail 19 plays a guiding role in the movement of the first slider.

[0029] In the embodiment of the present utility model, as Figures 1-2 shown, the first X-axis transmission assembly includes: a second motor 22, a second slide rail 23, a second lead screw, and a second slider 24; the second motor 22 is fixed on the X-axis transmission base plate 12; the second slide rail 23 is fixed on the X-axis transmission base plate 12; the second lead screw is arranged on the second slide rail 23, and the second lead screw is connected to the output end of the second motor 22; a threaded hole is provided inside the second slider 24, the threaded hole of the second slider 24 is sleeved outside the second lead screw, and the second slider 24 is slidably connected to the second slide rail 23, and the X-axis sliding base plate 13 is connected to the second slider 24.

[0030] The rotation of the second lead screw is controlled by the second motor 22, causing the second slider 24 to drive the X-axis sliding base plate 13 to move along the second lead screw, so that the grinding tool 32 contacts the spherical valve core 21, polishing the spherical valve core 21, and the second slide rail 23 guides the movement of the second slider 24.

[0031] In the embodiment of the present utility model, as Figures 1-2 shown, the second X-axis drive assembly includes: a third slide rail 25 and a third slider 26; the third slide rail 25 is fixed on the X-axis sliding base plate 13; the third slider 26 is connected to the third slide rail 25, and the power assembly is fixed on the third slider 26.

[0032] After the second motor 22 controls the power assembly and the grinding tool 32 to move into contact with the spherical valve core 21, continue to control the power assembly and the grinding tool 32 to move forward. At this time, under the action of force, the third slider 26 moves backward along the third slide rail 25 until the power assembly contacts the pressure sensor 14, and the second motor 22 controls the grinding tool 32 to continue moving forward, and the pressure sensor 14 is used to limit the power assembly and the grinding tool 32, so that the polishing pressure of the grinding tool 32 gradually increases. The polishing pressure of the grinding tool 32 is monitored by the pressure sensor 14, and the single-chip microcomputer analyzes this pressure value to determine whether the pressure exceeds the predetermined value; when it exceeds the predetermined value, the polishing pressure is relatively large, and at this time, the grinding tool 32 is controlled to retract, so as to reduce the polishing pressure; on the contrary, the grinding tool 32 is controlled to continue feeding, so as to increase the polishing pressure, and the pressure sensor 14 continuously collects data and makes a judgment, so as to ensure a stable polishing pressure, and then ensure the consistency of the pressure and improve the polishing effect.

[0033] In the embodiment of the present utility model, as Figures 1-3 shown, the power assembly includes: a third motor 27 and a reducer 28; the third motor 27 is fixed on the third slider 26 through the motor base plate, and the pressure sensor 14 is opposite to the position of the third motor 27; the reducer 28 is fixed on the third slider 26, the reducer 28 is connected to the output end of the third motor 27, and the output end of the reducer 28 is connected to the grinding tool 32 through a coupling assembly.

[0034] The reducer 28 decelerates the output end of the motor, and transmits the power to the grinding tool 32 through the coupling assembly, so as to make the grinding tool 32 rotate.

[0035] Specifically, the reducer 28 is provided with a grinding fluid inlet for providing a grinding medium during the polishing process, enabling it to pass through the pipeline inside the reducer 28, and inputting the grinding fluid into the hose 17 through the grinding fluid delivery pipe 16 installed in the output shaft of the reducer 28, and then spraying the grinding fluid onto the surface of the spherical valve core 21 through the hose 17.

[0036] In an embodiment of the present utility model, as Figures 2-3 shown, the coupling assembly includes: a flexible coupling 29 and a threaded stepped shaft 30; one end of the flexible coupling 29 is connected to the output end of the reducer 28; one end of the threaded stepped shaft 30 is connected to the other end of the flexible coupling 29, and the other end of the threaded stepped shaft 30 is connected to the grinding tool 32 through a fixing nut 31; wherein, the flexible coupling 29, the threaded stepped shaft 30 and the fixing nut 31 are all hollow structures, and the grinding fluid delivery pipe 16 and the hose 17 respectively pass through the flexible coupling 29, the threaded stepped shaft 30 and the fixing nut 31 in sequence and are connected to the grinding tool 32 in communication.

[0037] By connecting one end of the flexible coupling 29 to the reducer 28, the other end of the flexible coupling 29 is fixedly connected to the grinding tool 32 through the fixing nut 31, and the grinding fluid enters the reducer 28 through the grinding fluid inlet of the reducer 28 and is sprayed onto the surface of the spherical valve core 21 through the grinding fluid delivery pipe 16 and the hose 17, thereby improving the quality of polishing the spherical valve core 21.

[0038] Specifically, the flexible coupling 29 and the threaded stepped shaft 30 are both hollow structures, so as to facilitate the internal penetration of the hose 17 and the grinding fluid delivery pipe 16, and the middle of the flexible coupling 29 is a flexible spring, so as to realize slight adjustment when the centering is inaccurate, make the grinding tool 32 in good contact with the spherical valve core 21, and provide a stable polishing pressure.

[0039] In an embodiment of the present utility model, as Figures 1-3 shown, the grinding tool 32 is of a bowl-shaped structure, the edge of the grinding tool 32 in contact with the spherical valve core 21 is provided with a profiling surface of the grinding tool 32, and an annular groove 34 is provided at the middle position of the profiling surface of the grinding tool 32.

[0040] By making the grinding tool 32 of a bowl-shaped structure and machining a profiling surface of the grinding tool 32 at the edge of the grinding tool 32 in contact with the spherical valve core 21, the shape of which is consistent with the surface shape of the spherical valve core 21, so as to realize the purpose of increasing the contact area, further dispersing the pressure and reducing the pressure concentration, and by providing the annular groove 34, the retention time of the grinding fluid is prolonged, and further the grinding quality and processing efficiency are improved.

[0041] Implementation process: By controlling the first X-axis moving mechanism to move the X-axis sliding base plate 13 towards the spherical valve core 21, the grinding tool 32 is brought into contact with the spherical valve core 21. Continuing to control the power component and the grinding tool 32 to move forward, at this time, under the action of force, the third slider 26 moves backward along the third slide rail 25 until the power component contacts the pressure sensor 14, and the second motor 22 controls the grinding tool 32 to continue moving forward. The pressure sensor 14 is used to limit the power component and the grinding tool 32, so that the polishing pressure of the grinding tool 32 gradually increases. The polishing pressure of the grinding tool 32 is monitored by the pressure sensor 14, and the single-chip microcomputer analyzes this pressure value to determine whether the pressure exceeds the predetermined value. When it exceeds the predetermined value, the polishing pressure is relatively large. At this time, the grinding tool 32 is controlled to retract, so as to reduce the polishing pressure; on the contrary, the grinding tool 32 is controlled to continue feeding, so as to increase the polishing pressure. The pressure sensor 14 continuously collects data and makes judgments to ensure a stable polishing pressure, thereby ensuring the consistency of the pressure, improving the polishing effect, and avoiding the occurrence of uneven polishing or damage to the surface of the spherical valve core 21. And the grinding fluid is sprayed onto the processing surface of the spherical valve core 21 through the grinding fluid delivery pipe 16 and the hose 17, thereby improving the polishing quality of the spherical valve core 21.

[0042] In the description of the present invention, the term "a plurality" refers to two or more, unless otherwise clearly defined. The terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention; the terms "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the description of the present invention, the description of terms such as "an embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0044] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A precision polishing device for the surface of a spherical valve core with constant pressure control, characterized in that, Comprising: A machine tool module, the machine tool module includes a rotary table and a base, and a spherical valve core is installed on the rotary table; A Y-axis transmission component, the Y-axis transmission component is fixed on the base; A first X-axis moving mechanism, the first X-axis moving mechanism includes an X-axis transmission bottom plate and a first X-axis transmission component, the X-axis transmission bottom plate is connected to the moving end of the Y-axis transmission component, and the first X-axis transmission component is fixed on the X-axis transmission bottom plate; A second X-axis moving mechanism, the second X-axis moving mechanism includes an X-axis sliding bottom plate and a second X-axis transmission component, the X-axis sliding bottom plate is connected to the moving end of the first X-axis transmission component, and the second X-axis transmission component is fixed on the X-axis sliding bottom plate; A constant pressure module, the constant pressure module includes a power component, a pressure sensor and a grinding tool, the power component is connected to the moving end of the second X-axis transmission component, the pressure sensor is arranged on the top surface of the X-axis sliding bottom plate and is opposite to the position of the power component, and the output end of the power component is connected to the grinding tool through a coupling component; An infusion component, the infusion component includes a grinding fluid inlet, a grinding fluid delivery pipe and a hose, a grinding fluid inlet is arranged at one end of the power component, the grinding fluid delivery pipe is installed at the output end of the power component and is communicated with the grinding fluid inlet, one end of the hose is communicated with the grinding fluid delivery pipe, and the other end of the hose is connected to the grinding tool through a coupling component.

2. The precision polishing device for the surface of a spherical valve core with constant pressure control according to claim 1, wherein The Y-axis transmission component includes: A first motor, the first motor is fixed on the base; A first slide rail, the first slide rail is fixed on the base; A first lead screw, the first lead screw is arranged on the first slide rail, and the first lead screw is connected to the output end of the first motor; A first slider, a threaded hole is arranged in the first slider, the threaded hole of the first slider is sleeved outside the first lead screw, the first slider is slidably connected with the first slide rail, and the X-axis transmission bottom plate is connected to the first slider.

3. The precision polishing device for the surface of a spherical valve core with constant pressure control according to claim 2, wherein, The first X-axis transmission component includes: A second motor, the second motor is fixed on the X-axis transmission bottom plate; A second slide rail, the second slide rail is fixed on the X-axis transmission bottom plate; A second lead screw, the second lead screw is arranged on the second slide rail, and the second lead screw is connected to the output end of the second motor; A second slider, a threaded hole is arranged in the second slider, the threaded hole of the second slider is sleeved outside the second lead screw, and the second slider is slidably connected with the second slide rail, and the X-axis sliding bottom plate is connected to the second slider.

4. The precision polishing device for the surface of a spherical valve core with constant pressure control according to claim 3, characterized in that, The second X-axis transmission component includes: A third slide rail, the third slide rail is fixed on the X-axis sliding bottom plate; A third slider, the third slider is connected to the third slide rail, and the power component is fixed on the third slider.

5. The precision polishing device for the surface of a spherical valve core with constant pressure control according to claim 4, characterized in that, The power component includes: A third motor, the third motor is fixed on the third slider through a motor bottom plate, and the pressure sensor is opposite to the position of the third motor; Reducer, the reducer is fixed on the third slider, the reducer is connected to the output end of the third motor, and the output end of the reducer is connected to the grinding tool through a coupling assembly.

6. The precision polishing device for the surface of a spherical valve core with constant pressure control according to claim 5, characterized in that, The coupling assembly includes: Flexible coupling, one end of the flexible coupling is connected to the output end of the reducer; Threaded stepped shaft, one end of the threaded stepped shaft is connected to the other end of the flexible coupling, and the other end of the threaded stepped shaft is connected to the grinding tool through a fixing nut; Wherein, the flexible coupling, the threaded stepped shaft and the fixing nut are all hollow structures, and the grinding fluid delivery pipe and the hose respectively pass through the flexible coupling, the threaded stepped shaft and the fixing nut in sequence and are connected to the grinding tool in communication.

7. A precision polishing device for the surface of a spherical valve core with constant pressure control according to claim 6, characterized in that, The grinding tool is of a bowl-shaped structure, a grinding tool profiling surface is provided at the edge of the grinding tool in contact with the spherical valve core, and an annular groove is provided at the middle position of the grinding tool profiling surface.

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