阅读说明：本技术 一种球体研磨机 (Sphere grinds machine ) 是由 金建锋 金剑 谭明俊 金恩科 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种球体研磨机,其技术方案要点是包括有盛放台、设置于盛放台一侧的机架和设置于机架上的研磨机构,所述研磨机构位于盛放台的上方,所述盛放台上设置有用于夹持球体并带动球体旋转的定位机构,所述研磨机构包括有固定连接于机架上的第一电机,与第一电机的输出轴固定连接连接件、相对第一电机偏心设置并连接于连接件上的连接轴和球铰接于连接轴端部的传动件,所述传动件外接阀座,所述第一电机通过连接件、连接轴和传动件之间的联动带动阀座对球体进行研磨,解决了现有技术手工研磨的效率低且现有研磨机无法实现球面的全面研磨,导致球体表面不平的问题。(The invention discloses a sphere grinder, which has the technical scheme that the sphere grinder comprises a containing table, a machine frame arranged on one side of the containing table and a grinding mechanism arranged on the machine frame, the grinding mechanism is positioned above the containing table, a positioning mechanism used for clamping the ball body and driving the ball body to rotate is arranged on the containing table, the grinding mechanism comprises a first motor fixedly connected to the machine frame, a connecting piece fixedly connected with the output shaft of the first motor, a connecting shaft eccentrically arranged relative to the first motor and connected on the connecting piece, and a transmission piece hinged on the end part of the connecting shaft by a ball, the external disk seat of driving medium, first motor passes through the linkage drive valve seat between connecting piece, connecting axle and the driving medium and grinds the spheroid, has solved the inefficiency that prior art ground by hand and has just now ground the unable comprehensive grinding that realizes the sphere of machine, leads to the uneven problem in spheroid surface.)

1. The utility model provides a spheroid grinds machine which characterized in that: comprises a containing platform (1), a frame (2) arranged on one side of the containing platform (1) and a grinding mechanism (3) arranged on the frame (2), the grinding mechanism (3) is positioned above the containing table (1), a positioning mechanism (4) used for clamping the ball body (10) and driving the ball body (10) to rotate is arranged on the containing table (1), the grinding mechanism (3) comprises a first motor (5) fixedly connected to the frame (2), a connecting piece (6) fixedly connected with the output shaft of the first motor (5), a connecting shaft (7) which is eccentrically arranged relative to the first motor (5) and is connected on the connecting piece (6), and a transmission piece (8) which is hinged on the end part of the connecting shaft (7) through a ball, the ball grinding machine is characterized in that the transmission piece (8) is externally connected with a valve seat (9), and the first motor (5) drives the valve seat (9) to grind a ball (10) through linkage among the connecting piece (6), the connecting shaft (7) and the transmission piece (8).

2. A ball grinder as claimed in claim 1, wherein: driving medium (8) are a pole, the both ends of driving medium (8) are all flexible and are provided with fastener (11), two fastener (11) homoenergetic is removed along the length direction of driving medium (8), offer draw-in groove (12) that supply fastener (11) card to go into on the inner wall of disk seat (9), make in the cavity of driving medium (8) ability immigration disk seat (9) through earlier two fastener (11) relative motion, until fastener (11) and draw-in groove (12) corresponding, keep away from each other two fastener (11) and make two fastener (11) card go into respectively in corresponding draw-in groove (12).

3. A ball grinder as claimed in claim 2, wherein: the two clamping pieces (11) are elastically connected with the transmission piece (8).

4. A ball grinder as claimed in claim 3, wherein: the end surfaces of the two clamping pieces (11) facing the peripheral wall of the valve seat (9) are spherical surfaces.

5. A ball grinder as claimed in claim 1 or 2 or 3 or 4, characterised in that: positioning mechanism (4) including support (12) that are located spheroid (10) both sides, be located quiet top (13) and move top (14) on two supports (12) respectively, be used for driving quiet top (13) pivoted second motor (15) and be located anchor clamps (16) in spheroid (10) passageway, second motor (15) are connected on support (12) at quiet top (13) place, and the both ends that withstand anchor clamps (16) respectively through quiet top (13) and moving top (14) make anchor clamps (16) propped open and laminate with spheroid (10) passageway inner wall.

6. A ball grinder as claimed in claim 5, characterised in that: the clamp (16) comprises a hollow center cylinder (17) and support rings (18) positioned at two ends of the center cylinder (17), wherein the support rings (18) and the center cylinder (17) are coaxially arranged and positioned at the outer side of the center cylinder (17), a plurality of cutting lines (19) are arranged on the support rings (18), the cutting lines (19) are circumferentially distributed along the support rings (18) and divide the support rings (18) into a plurality of parts, the cutting lines (19) extend onto the center cylinder (17) and axially cut along the center cylinder (17), the center cylinder (17) is not cut into a plurality of parts, and the static top piece (13) and the movable top piece (14) are in a frustum shape or a cone shape towards one end of the center cylinder (17).

7. A ball grinder as claimed in claim 6, characterised in that: the cutting lines (19) at the two ends of the central cylinder (17) are arranged in a staggered manner.

8. A ball grinder as claimed in claim 6, characterised in that: the number of cutting lines (19) on both support rings (18) is four or an even number greater than four.

9. A ball grinder as claimed in claim 6, characterised in that: move support (12) at top (14) place and be provided with screw rod (21) that extend along spheroid (10) passageway length direction, screw rod (21) coaxial thread is connected with carousel (22), move top (14) and screw rod (21) coaxial setting and swivelling joint on carousel (22), when spheroid (10) is driven rotatory by quiet top (13), spheroid (10) drive move top (14) and rotate relatively carousel (22).

10. A ball grinder as claimed in claim 9, wherein: two ends of the inner cavity of the central cylinder (17) are respectively provided with an inclined plane part (20), and the two inclined plane parts (20) can be respectively attached to the static top piece (13) and the movable top piece (14).

Technical Field

The invention relates to machining equipment for ball valve accessories, in particular to a ball grinder.

Background

The ball is the opening and closing part of the ball valve, and in the prior art, in order to improve the sealing performance of the ball valve, the valve seat and the spherical surface of the ball are usually matched and ground, so that the matching between the sealing surface of the ball and the valve seat can reach the optimal matching.

Generally, the grinding of the ball body usually adopts manual grinding or mechanical grinding, but the manual grinding has low working efficiency and high labor intensity, and the existing mechanical grinding generally only carries out matched grinding on the sealing end of the ball body and the valve seat, cannot realize comprehensive grinding of the spherical surface, and causes uneven surface of the ball body, so that when the ball valve is opened or closed, the valve seat is easily abraded, and the sealing performance of the ball valve is influenced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a ball grinder which can grind the whole spherical surface instead of manual work.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a spheroid grinds machine, including holding the platform, setting up in the frame of holding platform one side and setting up the grinding mechanism in the frame, grind the top that the mechanism is located and holds the platform, it is provided with and is used for the centre gripping spheroid and drive the rotatory positioning mechanism of spheroid to hold the bench, grind the mechanism including fixed connection the first motor in the frame, with the output shaft fixed connection connecting piece of first motor, relative first motor off-centre setting and connect connecting axle and the ball on the connecting piece articulate in the driving medium of connecting axle tip, the external disk seat of driving medium, first motor passes through the linkage between connecting piece, connecting axle and the driving medium and drives the valve seat and grind the spheroid.

As a further improvement, the driving member is a rod, the two ends of the driving member are respectively provided with a clamping member in a telescopic manner, the two clamping members can move along the length direction of the driving member, the inner wall of the valve seat is provided with a clamping groove for the clamping of the clamping members, the driving member can move into the cavity of the valve seat by moving the two clamping members in opposite directions until the clamping members correspond to the clamping grooves, and the two clamping members are separated from each other to be respectively clamped into the corresponding clamping grooves.

As a further improvement of the invention, both the clamping pieces are elastically connected with the transmission piece.

As a further improvement of the invention, the end surfaces of the two clamping pieces facing the peripheral wall of the valve seat are spherical surfaces.

As a further improvement of the invention, the positioning mechanism comprises brackets positioned at two sides of the sphere, a static top piece and a movable top piece respectively positioned on the two brackets, a second motor for driving the static top piece and the movable top piece to rotate and a clamp positioned in the sphere channel, wherein the second motor is connected to the bracket where the static top piece is positioned, and the static top piece and the movable top piece respectively support two ends of the clamp so that the clamp is spread and attached to the inner wall of the sphere channel.

As a further improvement of the present invention, the fixture includes a hollow center cylinder and support rings positioned at two ends of the center cylinder, the two support rings are coaxially disposed with the center cylinder and are located outside the center cylinder, each of the two support rings is provided with a plurality of cutting lines, the plurality of cutting lines are distributed along a circumferential direction of the support ring and divide the support ring into a plurality of parts, the plurality of cutting lines extend onto the center cylinder and cut along an axial direction of the center cylinder, the center cylinder is not cut into a plurality of parts, and one end of the static top piece and one end of the movable top piece facing the center cylinder are in a table shape or a cone shape.

As a further improvement of the invention, the cutting lines at both ends of the central cylinder are arranged offset to each other.

As a further development of the invention, the number of cutting lines on both support rings is four or an even number greater than four.

As a further improvement of the invention, the support where the movable jacking piece is located is provided with a screw rod extending along the length direction of the ball channel, the screw rod is coaxially and threadedly connected with a turntable, the movable jacking piece and the screw rod are coaxially arranged and rotationally connected to the turntable, and when the ball body is driven to rotate by the static jacking piece, the ball body drives the movable jacking piece to rotate relative to the turntable.

As a further improvement of the invention, two ends of the inner cavity of the central cylinder are respectively provided with an inclined plane part, and the two inclined plane parts can be respectively attached to the static jacking piece and the movable jacking piece.

The invention has the beneficial effects that: the grinding mechanism comprises a first motor fixedly connected to the rack, a connecting piece fixedly connected with an output shaft of the first motor, a connecting shaft eccentrically arranged relative to the first motor and connected to the connecting piece, and a transmission piece hinged to the end part of the connecting shaft through a ball, wherein the transmission piece is externally connected with a valve seat; the valve seat swings back and forth and the positioning mechanism drives the ball body to rotate, so that the grinding range of the valve seat and the spherical surface of the ball body is enlarged to the whole spherical surface from a local spherical surface in a mode that the valve seat only rotates in the prior art, the grinding precision is improved, the ball body can be tightly matched with the valve seat in any state, and the overall sealing performance of the ball valve is improved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention when holding a ball;

FIG. 2 is a schematic view of the invention when the ball is released;

FIG. 3 is a perspective view of the valve seat and the actuator of the present invention;

FIG. 4 is an assembled perspective view of the valve seat and the driving member of the present invention;

FIG. 5 is a cross-sectional view of the valve seat and actuator assembly of the present invention;

FIG. 6 is a cross-sectional view of another embodiment of the present invention when the valve seat is assembled with the driving member;

fig. 7 is a perspective view of the clip of the present invention.

Reference numerals: 1. a containing table; 2. a frame; 3. a grinding mechanism; 4. a positioning mechanism; 5. a first motor; 6. a connecting member; 7. a connecting shaft; 8. a transmission member; 9. a valve seat; 10. a sphere; 11. a fastener; 12. a card slot; 13. a stationary top member; 14. a movable top piece; 15. a second motor; 16. a clamp; 17. a central barrel; 18. a support ring; 19. cutting a line; 20. an inclined plane part; 21. a screw; 22. a turntable; 23. and a bearing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals.

Referring to fig. 1 to 7, a ball grinder of this embodiment includes a holding table 1, a frame 2 disposed on one side of the holding table 1, and a grinding mechanism 3 disposed on the frame 2, the grinding mechanism 3 is disposed above the holding table 1, the holding table 1 is provided with a positioning mechanism 4 for holding a ball 10 and driving the ball 10 to rotate, the grinding mechanism 3 includes a first motor 5, a connecting member 6, a connecting shaft 7, and a transmission member 8, the transmission member 8 is externally connected to a valve seat 9, the first motor 5 is a rotary motor in the prior art, a body of the first motor 5 is fixedly connected to the frame 2, an output shaft of the first motor 5 is vertically disposed, the connecting member 6 is a plate, the connecting member 6 is sleeved on an output shaft of the first motor 5 and fixed by welding, the connecting member 6 extends in a horizontal direction, and one end of the connecting shaft 7 is processed into a ball shape, the driving part 8 is provided with a spherical groove for clamping the spherical end of the connecting shaft 7, the other end of the connecting shaft 7 is sleeved with a cover plate with the diameter smaller than that of the spherical end of the connecting shaft 7, the cover plate and the driving part 8 can be fixed together in a welding or bolt fastening mode, the spherical end of the connecting shaft 7 is partially exposed out of the cover plate, the driving part 8 is fixedly connected with the valve seat 9, in the prior art, the driving part 8 which is used for connecting with the connecting shaft 7 is not completely opened at the port part of the driving part when the valve seat 9 is machined, namely, the driving part 8 and the valve seat 9 are integrally formed; or as shown in fig. 1 and fig. 2, the transmission member 8 and the valve seat 9 are directly welded together to ensure the connection stability, one end of the connecting shaft 7 which is not processed into a sphere is passed through the connecting member 6, one end of the connecting shaft 7 which is passed through the connecting plate 6 is processed into an external thread, and a nut is screwed on, so that the connecting shaft 7 is positioned on the connecting member 6, the connecting shaft 7 is eccentrically arranged relative to the output shaft of the first motor 5 and is vertically arranged relative to the connecting member 6;

in the using process, the ball 10 is moved to the lower part of the valve seat 9 and is attached to the valve seat 9, then the ball 10 is clamped by the positioning mechanism 4, after the clamping is in place, the output shaft of the first motor 5 and the center of the ball 10 are positioned on the same vertical line, the first motor 5 is started, the first motor 5 drives the connecting piece 6 to rotate, the connecting shaft 7 makes circular motion around the output shaft of the first motor 5 along with the connecting piece 6, the transmission piece 8 swings relative to the connecting shaft 7 while moving along with the connecting shaft 7, the valve seat 9 and the transmission piece 8 move consistently, the valve seat 9 swings relative to the ball 10 while rotating, the surface of the ball 10 is ground by the valve seat 9, the positioning mechanism 4 drives the ball 10 to slowly rotate relative to the horizontal shaft, so that the whole surface of the ball 10 is fully ground by the valve seat 9 successively, after the grinding is finished, the ball 10 is taken down from the positioning mechanism 4, the connecting, then the transmission piece 8 and the valve seat 9 are cut and separated from each other;

compared with the prior art, the design can replace manual operation by manual grinding, save labor cost and has high efficiency; compared with the mode that the valve seat 9 only rotates in the prior art, the valve seat 9 swings back and forth, so that the grinding range of the valve seat 9 and the spherical surface of the ball 10 is expanded from a local spherical surface to a whole spherical surface, the grinding precision is improved, the ball 10 can be tightly matched with the valve seat 9 in any state, and the integral sealing performance of the ball valve is improved;

further, the height of the frame 2 is adjustable, and a structure for adjusting the height of the sunshade umbrella in the prior art or other structures can be adopted, so that the condition that the large-sized ball body is fixed on the positioning mechanism 4 firstly and then the valve seat 9 is attached to the ball body 10 in the installation process can be met, and the requirement is determined according to actual requirements.

As an improved specific embodiment, referring to fig. 6, the transmission member 8 is a rod, the two ends of the transmission member 8 are both telescopically provided with clamping members 11, external threads can be threaded on both ends of the transmission member 8, the two clamping members 11 are respectively sleeved outside both ends of the transmission member 8 and are in threaded connection with the transmission member 8, a slot 12 for the clamping member 11 to be clamped is formed on the inner wall of the valve seat 9, during the process of assembling the transmission member 8 and the valve seat 9, the two clamping members 11 are firstly rotated relative to the transmission member 8 and the two clamping members 11 move in opposite directions until the total length of the transmission member 8 and the two clamping members 11 is smaller than the diameter of the inner cavity of the valve seat 9, the transmission member 8 is moved towards the inner cavity of the valve seat 9, when the two clamping members 11 are respectively aligned with the corresponding slots 12, the two clamping members 11 are rotated in sequence so that the two clamping members 11 are successively inserted into the corresponding slots, in order to prevent the transmission piece 8 from moving radially relative to the valve seat 9, the clamping piece 11 can be continuously rotated to enable the end part of the clamping piece 11 to be abutted against the clamping groove 12, so that the connection stability between the transmission piece 8 and the valve seat 9 is improved; when the transmission member 8 and the valve seat 9 need to be disassembled, the two clamping pieces 11 are sequentially rotated relative to the transmission member 8, so that the total length of the transmission member 8 and the two clamping pieces 11 is smaller than the diameter of an inner cavity of the valve seat 9, the two clamping pieces 11 are separated from the corresponding clamping grooves 12, the transmission member 8 moves out of the valve seat 9 and is split, compared with the design, the mode that the transmission member 8 and the valve seat 9 are welded and cut is more beneficial to the disassembling operation between the transmission member 8 and the valve seat 9, the operation is simple and convenient, the transmission member 8 can be repeatedly used, and the total length of the transmission member 8 and the two clamping pieces 11 can be adjusted, so that the valve seat 9 is suitable for valve; compared with the situation without the clamping groove 12, the design of the clamping groove 12 can make up the defect that the valve seat 9 slides downwards relative to the transmission member 8 under the action of gravity, and further improves the connection stability between the transmission member 8 and the valve seat 9 in the vertical direction;

further, as the clamping piece 11 rotates relative to the clamping groove 12, the clamping part of the clamping piece 11 and the clamping groove 12 can be designed into a cylinder; the case that the number of the card 11 is one and the case that the card 11 is two belong to the replacement of the conventional means, and belong to the protection scope of the embodiment;

further optimization, referring to fig. 3 to 5, two clamping pieces 11 are elastically connected with the transmission member 8, the two clamping pieces 11 are respectively sleeved on two ends of the transmission member 8 and are limited on the transmission member 8, a spring is arranged between the clamping pieces 11 and the transmission member 8, two ends of the spring respectively abut against the clamping pieces 11 and the transmission member 8, in an initial state, the spring is in a natural state, the total length of the transmission member 8 and the two clamping pieces 11 is greater than the diameter of an inner cavity of the valve seat 9, in the process of assembling the transmission member 8 and the valve seat 9, the two clamping pieces 11 are oppositely pushed to the transmission member 8, the spring is compressed, after the total length of the transmission member 8 and the two clamping pieces 11 is smaller than the inner diameter of the valve seat 9, the transmission member 8 is moved to the opening of the inner cavity of the valve seat 9, the clamping pieces 11 and the clamping grooves 12 are on the same vertical line, the clamping pieces 11 are released and, the driving piece 8 is pushed downwards, the clamping piece 11 slides relative to the inner wall of the valve seat 9 until the clamping piece 11 slides to the clamping groove 12, the spring continues to push the clamping piece 11, and the clamping piece 11 is clamped in the clamping groove 12; when the transmission member 8 and the valve seat 9 need to be detached, the two clamping pieces 11 move oppositely, the spring is compressed, after the total length of the to-be-transmitted member 8 and the two clamping pieces 11 is smaller than the inner diameter of the valve seat 9, the transmission member 8 moves upwards out of the valve seat 9, compared with the previous embodiment, the movement of the clamping pieces 11 relative to the transmission member 8 is more convenient to adjust, the detaching efficiency between the transmission member 8 and the valve seat 9 is improved, the clamping pieces 11 can be provided with stress members which penetrate through the transmission member 8 and can move linearly, and operators can conveniently adjust and control the clamping pieces 11;

further optimization, referring to fig. 3 and 5, the end surfaces of the two clamping pieces 11 facing the peripheral wall of the valve seat 9 are spherical surfaces, when the clamping pieces 11 and the clamping grooves 12 are not on the same vertical line, the rotating piece 8 rotates relative to the axis of the valve seat 9, the clamping pieces 11 slide relative to the inner wall of the valve seat 9, the spherical surfaces of the clamping pieces 11 can facilitate the sliding of the clamping pieces 11 relative to the inner wall of the valve seat 9 in any direction, the contact surface between the clamping pieces 11 and the inner wall of the valve seat 9 is small, the friction force between the clamping pieces 11 and the inner wall of the valve seat 9 is small, the abrasion on the inner wall of the valve seat 9 is reduced, the clamping pieces 11 can slowly enter the clamping grooves 12 due to the spherical surface design of the clamping pieces 11, the collision between the clamping pieces 11 and the valve seat 9 can be reduced compared with;

further, referring to fig. 5, the depth of the slot 12 for the clip 11 to extend into is greater than the radius of the spherical end of the clip 11, so as to ensure that the valve seat 9 does not slide relative to the spherical surface of the clip 11 under the action of gravity, and avoid the situation that the valve seat 9 is separated from the clip 11.

As a modified specific embodiment, referring to fig. 1, 2 and 6, the positioning mechanism 4 includes brackets 12 located at both sides of the sphere 10, a static top member 13 and a dynamic top member 14 respectively located on the two brackets 12, a second motor 15 for driving the static top member 13 to rotate, and a clamp 16 located in a passage of the sphere 10, the second motor 15 is connected to the bracket 12 where the static top member 13 is located, the clamp 16 includes a hollow center cylinder 17 and support rings 18 located at both ends of the center cylinder 17, the two support rings 18 are coaxially arranged with the center cylinder 17 and located outside the center cylinder 17, the center cylinder 17 and the two support rings 18 can be integrally formed, multiple cuts are performed perpendicular to the end faces of the support rings 18, a certain depth is cut along the axial direction of the center cylinder 17, the center cylinder 17 is not cut by multiple parts, the cut parts are cutting lines 19, the multiple cutting lines 19 are distributed around the circumference of the axis of the center cylinder 17, the static top piece 13 and the movable top piece 14 are in a frustum shape or a cone shape towards one end of the central cylinder 17, the diameter of the supporting ring 18 is slightly smaller than the diameter of the inner cavity of the sphere 10, the supporting ring 18 is in clearance fit with the inner cavity of the sphere 10, the contour size of the inner cavity of the central cylinder 17 is smaller than the contour size of the maximum cross section of the static top piece 13 or the movable top piece 14, the distance between the end surfaces of the two supporting rings 18 which are deviated from each other is equal to the length of the inner cavity of the sphere 10, and when the cavity of the central cylinder 17 is in a cylindrical shape, the static top piece 13 and the movable top piece 14 are; when the cavity of the central cylinder 17 is in a polygon prism shape, the static top piece 13 and the movable top piece 14 are frustum bodies or pyramid bodies, in the process of mounting the sphere 10 on the positioning mechanism 4, the clamp 16 is placed in the sphere 10, the two support rings 18 are respectively positioned at the two ends of the channel of the sphere 10, the support 12 where the movable top piece 14 is positioned can be arranged in a sliding manner relative to the holding table 1, the position of the support 12 is adjusted so that the sphere 10 can move between the static top piece 13 and the movable top piece 14, the two ends of the central cylinder 17 respectively correspond to the static top piece 13 and the movable top piece 14, then the sphere 10 is horizontally moved so that one end of the central cylinder 17 is abutted against the static top piece 13, then the support 12 where the movable top piece 14 is positioned is adjusted so that the movable top piece 14 gradually approaches the central cylinder 17 and is inserted into the central cylinder 17 until the movable top piece 14 cannot move linearly, and the central cylinder 17 can be propped open by the static top piece 13 and the movable top piece 14 due to the division of the cutting line, the outer walls of the two support rings 18 abut against the inner wall of the ball 10, and the ball 10 is clamped in place;

in the grinding process, the second motor 15 drives the clamp 16 to rotate, the clamp 16 drives the sphere 10 to rotate, when the inner cavity of the central cylinder 17 is in a pure columnar shape, the static top piece 13 and the movable top piece 14 are designed into a frustum or pyramid, the outer part of the inner cavity of the central cylinder 17 is in a polygon prism shape, the movable top piece 14 is rotatably connected with the support 12 where the movable top piece 14 is located, namely, the movable top piece 14 rotates along with the sphere 10 while the second motor 15 drives the sphere 10 to rotate; or the inner cavity of the central cylinder 17 is formed by connecting a prism and a cylinder, the static top piece 13 is a frustum or pyramid and is clamped with the polygonal port of the central cylinder 17, the movable top piece 14 is a circular frustum or cone and is clamped with the circular port of the central cylinder 17, the movable top piece 14 is static relative to the bracket 12 where the movable top piece is located, namely the movable top piece 14 rotates relative to the central cylinder 17 while the second motor 15 drives the sphere 10 to rotate, and the static top piece is determined according to actual requirements;

compared with the mode of manually rotating the sphere 10 in the prior art, the design of the positioning mechanism 4 can realize that the whole spherical surface of the sphere 10 is automatically ground in sequence, thereby saving labor cost; the design of the clamp 16 can be independently expanded according to each cutting part of the cutting line 19, so that the clamp 16 can be expanded and clamp the ball 10 in a self-adaptive manner under the condition that the inner passages of some balls 10 are not flat, and the clamping stability is greatly improved; support ring 18 is two and just distributes and set up in the both ends of spheroid 10 passageway and do benefit to support ring 18 express delivery and strut, and compares that support ring 18 has the condition clamping-force of only one bigger, and spheroid 10 is more stable.

As a modified specific embodiment, referring to fig. 7, if the cutting lines 19 at both ends of the central cylinder 17 are correspondingly arranged in the previous embodiment, the length of the cutting line 19 is less than half the length of the central cylinder 17, the length of the cutting line 19 is limited, the degree to which the central cylinder 17 is spread out is correspondingly limited, meanwhile, the uncut length between the two opposite cutting lines 19 is small, and the uncut length is easy to be stressed and concentrated to be broken when the two ends of the central cylinder 17 are stretched, so that the service life of the central cylinder 17 is influenced, in order to solve the problems, the cutting lines 19 positioned at the two ends of the central cylinder 17 are arranged in a staggered way, such a design enables, in comparison with the aforementioned drawbacks, the length of the cutting line 19 to exceed half the total length of the central cylinder 17, enlarging the extent to which the support ring 18 is stretched, the stress of the uncut part is dispersed, the central cylinder 17 is not easy to damage, and the service life of the central cylinder 17 is indirectly prolonged;

further optimization, the position of the cutting line 19 at one end is positioned in the middle position of two adjacent cutting lines 19 at the other end;

further optimization, the number of the cutting lines 19 on the two support rings 18 is four or even number larger than four, the design of the four cutting lines 19 enables the support rings 18 to be expanded upwards, downwards, leftwards and rightwards in a square shape, and the design is more comprehensive in direction compared with the case that the number of the cutting lines is smaller than four; the fact that the number of the cutting lines 19 is even compared with the case that the number of the cutting lines 19 is odd makes the cut part of the support ring 18 symmetrical, and is more uniform in force, which is beneficial for the support ring 18 to clamp the ball 10.

As a modified specific embodiment, referring to fig. 1 and fig. 2, a support 12 where the movable top piece 14 is located is provided with a screw 21 extending along the length direction of the passage of the sphere 10, the screw 21 is fixedly connected to the support 12, a threaded hole coaxially arranged with the screw 21 is formed in the turntable 22, the threaded hole penetrates through the turntable 22, a bearing hole coaxially arranged with the threaded hole is formed in the end surface of the turntable 22 facing the sphere 10, the bearing hole and the threaded hole together form a counter bore, the bearing hole is in interference fit with a bearing 23, the bearing 23 can be selected from a rolling bearing or a ball bearing, etc., the turntable 22 is in threaded connection with the screw 21 through the threaded hole, a shaft is extended from the movable top piece 14, the shaft is in interference fit with an inner ring of the bearing 23 and has a diameter larger than that of the screw 21, the screw 21 penetrates through the movable top piece 14, when the sphere 10 is mounted on the positioning mechanism 4, the movable turntable 22 rotates relative to the screw 21 to, the movable top part 14 moves linearly along with the screw 21 of the rotary table 22, the distance between the movable top part 14 and the static top part 13 is increased, the ball 10 moves to the position between the movable top part 14 and the static top part 13, the rotary table 22 is rotated reversely, so that the rotary table 22 drives the movable top part 14 to move towards the ball 10, the movable top part 14 is abutted against the clamp 16, the rotary table 22 is rotated continuously, the clamp 16 blocks the movable top part 14 to limit the rotation of the movable top part 14, the movable top part 14 rotates relative to the rotating disc 22 through the bearing 23 until the rotating disc 22 cannot rotate, the ball 10 is fixed by the movable top part 14 and the static top part 13, the second motor 15 drives the static top part 13 to rotate, and simultaneously, the ball 10 and the movable top part 14 both rotate along with the static top part 13, the design makes up the defect that the movable top piece 14 is fixedly connected with the rotary table 22 and mutually abraded with the clamp 16, the power required by the second motor 15 to drive the ball 10 to rotate is reduced, and the form and structure of the movable top piece 14 can be selected at will;

further optimization, the movable top part 14 and the static top part 13 are designed to be cones or round tables, inclined plane parts 20 are arranged at two ends of an inner cavity of the central cylinder 17, the two inclined plane parts 20 can be attached to the static top part 13 and the movable top part 14 respectively, compared with the situation that the inner cavity of the central cylinder 17 is simply columnar, the design of the inclined plane parts 20 can increase the removing areas of the static top part 13 and the movable top part 14 and the central cylinder 17, the peripheral surfaces of the movable top part 14 and the static top part 13 are effectively protected from being knocked by the port of the central cylinder 17, and meanwhile, the transmission efficiency of the movable top part 14 and the static top part 13 and the central cylinder 17 can be improved.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.