A magnetic grinding device for machining ball valve core

Abstract

The present invention relates to a magnetic grinding device for processing a ball valve core. The magnetic grinding device for processing a ball valve core comprises a fixing member fixedly connected to the ball valve core and a housing shell having a spherical inner cavity for accommodating the ball valve core, the housing shell comprises at least two detachably connected split shells, the spherical inner cavity is surrounded by the split shells, at least two magnetic poles are arranged on the housing shell, at least one of the magnetic poles is an opposite magnetic pole to the adjacent magnetic poles so that the magnetic abrasive adsorbed between the opposite magnetic poles forms a magnetic brush, and the magnetic grinding device also comprises a driving mechanism for driving the fixing member or / and the housing shell to rotate so that the magnetic brush and the ball valve core generate relative motion to grind the outer surface of the ball valve core. The magnetic abrasive forms a magnetic brush along the surface of the ball valve core, and the fixing member or / and the housing shell are driven to rotate so that the magnetic brush and the ball valve core generate relative motion, and the magnetic brush can grind the outer surface of the ball valve core, thereby realizing the grinding process of the outer surface of the ball valve core.

Description

Technical Field

[0001] The invention relates to a magnetic grinding device for machining a ball valve core. Background Art

[0002] Some workpieces of precision instruments have high requirements for surface roughness while meeting the requirements for size and shape accuracy. Therefore, the workpiece surface needs to be ground after turning. In the prior art, a mechanical grinding head is usually used to directly rub the workpiece surface to grind the workpiece. The elastic deformation ability of the grinding head is poor. During the grinding process, the grinding head is easy to scratch the workpiece, which affects the use of the workpiece and the quality of the workpiece.

[0003] The Chinese invention patent application with application publication number CN108555764A and application publication date September 21, 2018 discloses a magnetic tube inner surface grinding and polishing device, which adopts a cross-shaped magnetic pole set on the inner surface of the magnetic tube. Under the action of the magnetic force generated by the magnetic pole, the magnetic abrasive (powder that can be attracted by the magnet and can grind the workpiece) is sucked and pressed on the surface of the workpiece. There is a processing gap of several millimeters between the workpiece surface and the magnetic pole. The magnetic abrasive is neatly arranged along the magnetic lines in the processing gap to form a magnetic brush. The cross-shaped magnetic pole is driven by the motor to make a circular rotation, so that the magnetic abrasive makes a spiral linear motion in the magnetic tube, thereby completing the grinding process of the inner surface of the magnetic tube. Since the magnetic abrasive is a discrete free abrasive, the magnetic brush has good processing flexibility. The magnetic brush can change with the change of the shape of the workpiece, which can prevent the surface of the workpiece from being scratched during the grinding process, and significantly improve the processing quality of the workpiece. This method of grinding the workpiece by a magnetic brush in a magnetic field is called magnetic grinding.

[0004] However, the above-mentioned magnetic tube inner surface grinding and polishing device can only process the inner or outer surface of cylindrical parts. There is no suitable magnetic grinding device for non-cylindrical parts such as ball valve core. Summary of the invention

[0005] The object of the present invention is to provide a magnetic grinding device for machining a ball valve core, so as to solve the problem that the magnetic grinding device in the prior art cannot machine the ball valve core.

[0006] To achieve the above-mentioned purpose, the technical solution of the magnetic grinding device for processing the ball valve core of the present invention is: a magnetic grinding device for processing the ball valve core, comprising a fixing part for detachably fixedly connected to the ball valve core and a containing shell having a spherical inner cavity for accommodating the ball valve core, the containing shell comprising at least two split shells that are detachably connected to enable the ball valve core to be loaded and removed, the spherical inner cavity is surrounded by the split shells, and at least two magnetic poles for adsorbing magnetic abrasives are arranged on the containing shell, at least one of the magnetic poles is a magnetic pole of opposite sex with the adjacent magnetic poles so that the magnetic abrasive adsorbed between the magnetic poles of opposite sex forms a magnetic brush, and the magnetic grinding device also includes a driving mechanism for driving the fixing part and / or the containing shell to rotate so that relative movement is generated between the magnetic brush and the ball valve core to grind the outer surface of the ball valve core.

[0007] The beneficial effect of the magnetic grinding device for processing the ball valve core of the present invention is that the grinding device includes a containing shell having a spherical inner cavity for accommodating the ball valve core, and at least two magnetic poles are arranged inside the containing shell for absorbing magnetic abrasives, and at least one of the magnetic poles is a magnetic pole of opposite polarity with the adjacent magnetic poles. Under the adsorption effect of the magnetic poles and the extrusion effect of the outer surface of the ball valve core, the magnetic abrasive forms a magnetic brush along the surface of the ball valve core. By driving the fixing part and / or the containing shell to rotate, relative movement can be generated between the magnetic brush and the ball valve core. Under the action of the magnetic force outside the magnetic field, the magnetic brush generates friction with the ball valve core, and grinds the outer surface of the ball valve core under the action of the friction force, thereby realizing the grinding processing of the outer surface of the ball valve core.

[0008] Furthermore, the fixing member is a fixing rod that passes through the ball valve core, and at least one end of the fixing rod that passes through the ball valve core is provided with a clamping member for clamping the ball valve core to the fixing rod. The advantage is that the fixing member is in the shape of a rod, has a simple structure, and is convenient for processing and manufacturing; the fixing rod passes through the ball valve core, and at least one end is provided with a clamping member, which has a better fixing effect on the ball valve core, avoids the ball valve core from shaking during the grinding process, and ensures the grinding effect of the ball valve core.

[0009] Furthermore, the fixing rod is provided with a threaded section, and the clamping piece is a nut threadedly connected to the threaded section on the fixing rod. The advantage is that the fixing rod and the clamping piece are threadedly connected, which facilitates the installation and clamping of the clamping piece, and the connection position of the nut and the threaded section can be adjusted. By adjusting the position of the nut, the fixed position of the ball valve core and the fixing rod can be adjusted. Therefore, when grinding ball valve cores of different sizes and specifications, the position of the ball valve core can be adjusted to make the ball center of the ball valve core coincide with the ball center of the spherical inner cavity, thereby ensuring the grinding accuracy of the ball valve core.

[0010] Furthermore, the fixing rod passes through the center of the spherical inner cavity of the containing shell, and one end of the fixing rod passes through the containing shell and is connected to the driving mechanism in a transmission manner. The advantage is that the fixing rod passes through the center of the spherical inner cavity of the containing shell, which facilitates the arrangement of the magnetic poles on the containing shell, and the fixing rod is connected to the driving mechanism in a transmission manner to rotate the valve core of the ball valve, which can reduce the influence of centrifugal force on the shape of the magnetic brush during the grinding process, and ensure the grinding reliability of the magnetic grinding device.

[0011] Furthermore, the split shell is provided with two halves. The advantage is that there are two split shells, so that the containing shell can be quickly disassembled and assembled, and the two split shells are provided in half, that is, the two split shells have the same structure and are universal.

[0012] Furthermore, both ends of the fixing rod are rotatably matched with the containing shell through bearings. The advantage is that the fixing rod and the containing shell are rotatably matched through bearings, which can prevent wear between the bearings and the containing shell and ensure that the ball valve core rotates smoothly at the center of the containing shell.

[0013] Furthermore, any one of the magnetic poles and the magnetic pole closest to it are all opposite magnetic poles. The advantage is that any one of the magnetic poles and the magnetic pole closest to it are all opposite magnetic poles, which can ensure the uniform distribution of magnetic flux lines in the spherical inner cavity, so that the magnetic abrasive can be evenly distributed near each magnetic pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a usage state diagram of a specific embodiment of the magnetic grinding device for machining a ball valve core of the present invention;

[0015] Figure 2 for Figure 1 Left view of the middle structure;

[0016] Figure 3 for Figure 2 A magnified view of part A;

[0017] In the figure: 1, driving motor; 101, motor housing; 102, motor output shaft; 2, containing shell; 201, split shell; 3, coupling; 4, fixing rod; 5, upper connecting bolt; 6, adjusting stud; 7, magnetic pole; 8, ball valve core; 9, upper bearing; 10, upper nut; 11, lower nut; 12, lower bearing; 13, lower connecting bolt; 14, motor bracket; 15, workbench; 16, adjustment table; 17, bottom support table; 18, first screw rod; 19, first motor; 20, first thread sleeve; 21, second screw rod; 22, second motor; 23, second thread sleeve; 24, magnetic abrasive; 25, permanent magnet N pole; 26, permanent magnet S pole. DETAILED DESCRIPTION

[0018] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] A specific embodiment of the magnetic grinding device for machining a ball valve core (hereinafter referred to as the magnetic grinding device) of the present invention is as follows: Figure 1 and Figure 2 As shown, the magnetic grinding device includes a driving motor 1, a fixing rod 4 drivingly connected to the motor output shaft 102 via a coupling 3, a containing shell 2 enclosing a spherical inner cavity, a motor bracket 14 for fixing the driving motor 1, and a workbench 15 for fixing the containing shell 2.

[0020] The containment shell 2 can be detachably fixed on the workbench 15, and the containment shell 2 is supported by the workbench 15. The containment shell 2 is composed of two half-disposed sub-shells 201. The two half-disposed sub-shells 201 can be detachably fixedly connected so that the ball valve core 8 can be loaded and unloaded. The two half-disposed sub-shells 201 have the same structure and are universal. The two sub-shells 201 are connected by connecting bolts. There are four connecting bolts, namely, an upper connecting bolt 5 disposed on the top of the containment shell 2 and a lower connecting bolt 13 disposed on the bottom of the containment shell 2.

[0021] The upper and lower ends of the containment shell 2 are provided with avoidance holes for the fixed rod 4 to extend therein, and the avoidance holes are located at the junction of the two sub-shells 201. The upper and lower ends of the fixed rod 4 are respectively rotatably matched with the containment shell 2 through the upper bearing 9 and the lower bearing 12 to prevent wear between the fixed rod 4 and the containment shell 2. The upper bearing 9 and the lower bearing 12 can also limit the relative position between the fixed rod 4 and the containment shell 2. The ball valve core 8 is fixedly connected to the fixed rod 4. During the grinding process, the fixed rod 4 can limit the relative position of the ball valve core 8 and the containment shell 2, ensuring that the ball valve core 8 rotates smoothly in the containment shell 2, thereby ensuring the grinding effect of the ball valve core 8.

[0022] The fixing rod 4 passes through the ball valve core 8, and a threaded section is provided on the fixing rod 4. The ball valve core 8 is clamped on the fixing rod 4 by a nut adapted to the threaded section. There are two nuts, an upper nut 10 located above the ball valve core 8 and a lower nut 11 located below the ball valve core 8. When in use, the upper nut 10 and the lower nut 11 stop the ball valve core 8 to limit the axial displacement of the ball valve core 8 on the fixing rod 4. The connection position of the upper nut 10 and the lower nut 11 on the threaded section can be adjusted, and the position of the adjusting nut can adjust the fixed position of the ball valve core 8 and the fixing rod 4. Therefore, when grinding ball valve cores 8 of different sizes and specifications, the position of the ball valve core 8 can be adjusted to make the ball center of the ball valve core 8 coincide with the ball center of the spherical inner cavity, which is convenient for calculating the position where the magnetic pole 7 should be located and ensuring the grinding accuracy of the ball valve core 8.

[0023] The driving motor 1 includes a motor housing 101 and a motor output shaft 102 . The motor bracket 14 is fixedly connected to the motor housing 101 . The upper end of the fixing rod 4 is detachably connected to the motor output shaft 102 through the coupling 3 .

[0024] like Figure 3 As shown, the magnetic grinding device also includes a plurality of magnetic poles 7 arranged on the containing shell, the ball valve core 8 and the magnetic abrasive 24 are both located in the spherical inner cavity, and the magnetic abrasive 24 forms a magnetic brush along the outer surface of the ball valve core 8 under the adsorption effect of the magnetic poles 7 and the extrusion effect of the outer surface of the ball valve core 8. When the fixed rod 4 drives the ball valve core 8 to rotate, a relative movement is generated between the magnetic brush and the ball valve core 8, and the magnetic brush generates friction with the ball valve core 8 under the action of magnetic force. The magnetic brush grinds the outer surface of the ball valve core 8 under the action of friction, thereby realizing the grinding process of the outer surface of the ball valve core 8 by the magnetic grinding method. Since the magnetic abrasive 24 is a discrete free abrasive, the magnetic brush has good processing flexibility, and the magnetic brush can change with the change of the shape of the ball valve core 8, which can prevent the outer surface of the ball valve core 8 from being scratched during the grinding process, thereby improving the processing quality of the ball valve core 8.

[0025] The containing shell 2 is provided with a radial threaded hole whose axis passes through the center of the sphere. The magnetic pole 7 is set on the containing shell 2 by an adjusting stud 6 that is adapted to the threaded hole. The relative position of the magnetic pole 7 and the containing shell 2 can be adjusted by screwing the adjusting stud 6. When processing different types of ball valve cores 8, the distance between the magnetic pole 7 and the ball valve core 8 can be adjusted to a suitable value by screwing the adjusting stud 6, so that the magnetic grinding device can adapt to different types of ball valve cores 8. In addition, a plurality of magnetic poles 7 are installed on each split shell 201, and any one of the magnetic poles 7 and the magnetic pole 7 closest to the magnetic pole 7 are opposite magnetic poles 7, which can ensure the uniform distribution of magnetic flux lines in the spherical inner cavity, so that the magnetic abrasive 24 can be evenly distributed near each magnetic pole 7, thereby ensuring the grinding accuracy of the ball valve core 8. The distribution state of the magnetic flux lines and the magnetic abrasive 24 between the adjacent permanent magnets N-grade 25 and permanent magnets S-grade 26 is shown as follows. Figure 3 shown.

[0026] The magnetic grinding device also includes a bottom support platform 17, an adjustment platform 16 is also arranged between the bottom support platform 17 and the workbench 15, a first screw nut mechanism for adjusting the X-direction position of the workbench 15 is arranged on the workbench 15, and a second screw nut mechanism for adjusting the Y-direction position of the adjustment platform 16 is arranged on the adjustment platform 16, so that the workbench 15 and the adjustment platform 16 form a cross slide structure. Among them, the first screw nut mechanism includes a first motor 19 fixedly connected to the adjustment platform 16, a first screw rod 18 connected to the driving shaft of the first motor 19, a first threaded sleeve 20 threadedly matched with the first screw rod 18 is sleeved on the first screw rod 18, and the first threaded sleeve 20 is fixedly connected to the workbench 15. The second screw nut mechanism includes a second motor 22 fixedly connected to the bottom support platform 17, a second screw rod 21 connected to the driving shaft of the second motor 22, a second threaded sleeve 23 threadedly matched with the second screw rod 21 is sleeved on the second screw rod 21, and the second threaded sleeve 23 is fixedly connected to the adjustment platform 16.

[0027] The working principle of the magnetic grinding device of the present invention:

[0028] When in use, first insert the fixing rod 4 into the ball valve core 8 and adjust the relative fixed position of the ball valve core 8 and the fixing rod 4 through the upper nut 10 and the lower nut 11, adjust the position of the magnetic pole 7 according to the model of the ball valve core 8, then fix a sub-shell 201 on the workbench 15, place the ball valve core 8 and the fixing rod 4 in the sub-shell 201, make the upper bearing 9 and the lower bearing 12 on the fixing rod 4 respectively located in the avoidance hole, then fix another split shell, make the two sub-shells 201 merge and be fixed by connecting bolts, and at the same time, it is necessary to load magnetic abrasive into the containing shell. Then adjust the position of the containing shell 2 to the bottom of the driving motor 1 through the cross slide structure, so that the fixing rod 4 coincides with the axis of the motor output shaft 102. Use the split coupling 3 or adjust the upper and lower fixed positions of the driving motor 1 on the motor bracket 14, and connect the motor output shaft 102 with the fixing rod 4 through the coupling 3. During grinding, the drive motor 1 is started, and the drive motor 1 drives the fixed rod to rotate, thereby causing the ball valve core 8 to rotate in the containing shell 2. The magnetic abrasive 24 grinds the ball valve core 8 under the action of friction. After the grinding is completed, the drive motor 1 is turned off, and the various parts of the magnetic grinding device are separated in turn. Finally, the ball valve core 8 is removed from the fixed rod 4, and the grinding is completed.

[0029] In other embodiments, there may be only two magnetic poles installed on each split shell, and the two magnetic poles are of opposite poles, or there may be only two magnetic poles installed on the entire containing shell, and the two magnetic poles are of opposite poles. In this case, the magnetic poles need to be set larger, and the magnetic poles need to be arc-shaped so that the magnetic brush can cover the outer surface of the ball valve core to the maximum extent.

[0030] In other embodiments, bearings may not be provided at both ends of the fixing rod, but the fixing rod may directly rotate and frictionally engage with the containing shell.

[0031] In other embodiments, only one nut for fixing the ball valve core to the fixing rod may be provided below or above the ball valve core, and a step is provided at the other end of the fixing rod. One end of the ball valve core is pressed against the step surface, and the other end is clamped by the nut.

[0032] In other embodiments, there may be no threaded section on the fixing rod, and the ball valve core is not clamped by a nut. For example, the fixing rod is a bare rod. At this time, after the fixing rod passes through the ball valve core, clamps may be fixed on the fixing rod at both ends of the ball valve core. The clamps are fixedly connected to the fixing rod, and their fixed position relative to the fixing rod is adjustable, thereby clamping the ball valve core on the fixing rod.

[0033] In other embodiments, the fixing rod may not pass through the ball valve core, and an internal threaded hole may be processed on the ball valve core, and the internal threaded hole is threadedly connected to the threaded section on the fixing rod to fix the relative position between the fixing rod and the ball valve core.

[0034] In other embodiments, the containing shell may also be composed of three or more sub-shells. When assembling the containing shell, the sub-shells are fixedly connected in sequence.

[0035] In other embodiments, the fixing rod may not pass through the center of the spherical inner cavity. In this case, the driving mechanism is connected to the containing shell in a transmission manner, and the containing shell is not fixedly connected to the workbench. In this case, the fixing rod can be fixed on the workbench. The function of the fixing rod is only to fix the valve core of the ball valve. Therefore, there is no need to pass through the center of the spherical inner cavity. Of course, the fixing piece may not be rod-shaped, but block-shaped, and the block-shaped fixing piece is fixed to the workbench.

[0036] In other embodiments, the accommodating shell and the ball valve core may be driven to rotate simultaneously by two driving mechanisms.

Claims

1. A magnetic grinding device for machining a ball valve core, characterized in that: The invention comprises a fixing part for being detachably fixedly connected with a ball valve core and a containing shell having a spherical inner cavity for containing the ball valve core, the containing shell comprising at least two split shells which are detachably connected so that the ball valve core can be loaded and taken out, the spherical inner cavity is surrounded by the split shells, each of the split shells is provided with at least two magnetic poles for absorbing magnetic abrasives, any magnetic pole and the magnetic pole closest to the magnetic pole are opposite magnetic poles, which can ensure the uniform distribution of magnetic flux lines in the spherical inner cavity, so that the magnetic abrasives can be evenly distributed near each magnetic pole, the containing shell is provided with a radial threaded hole whose axis passes through the center of the spherical inner cavity, the magnetic pole is arranged on the containing shell through an adjusting stud matched with the threaded hole, the magnetic abrasive forms a continuous magnetic brush between adjacent opposite magnetic poles along the outer surface of the ball valve core under the adsorption effect of the magnetic pole and the extrusion effect of the outer surface of the ball valve core, and the magnetic grinding device also comprises a driving mechanism for driving the fixing part and / or the containing shell to rotate so that relative movement is generated between the magnetic brush and the ball valve core to grind the outer surface of the ball valve core.

2. The magnetic grinding device for machining a ball valve core according to claim 1, characterized in that: The fixing member is a fixing rod that passes through the ball valve core, and at least one end of the fixing rod that passes through the ball valve core is provided with a clamping member that is used to clamp and fix the ball valve core on the fixing rod.

3. The magnetic grinding device for machining a ball valve core according to claim 2, characterized in that: The fixing rod is provided with a threaded section, and the clamping piece is a nut threadably connected to the threaded section on the fixing rod.

4. The magnetic grinding device for machining a ball valve core according to claim 2 or 3, characterized in that: The fixing rod passes through the center of the spherical inner cavity of the containing shell, and one end of the fixing rod passes through the containing shell and is transmission-connected with the driving mechanism.

5. The magnetic grinding device for machining a ball valve core according to claim 1, 2 or 3, characterized in that: The split shell is provided with two halves.

6. The magnetic grinding device for machining a ball valve core according to claim 2 or 3, characterized in that: Both ends of the fixing rod are rotatably matched with the containing shell through bearings.

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