A clamp and device for grinding a sphere

Abstract

The utility model relates to the field of grinding sphere, concretely relates to a fixture and grinding sphere's device. The fixture includes support mandrel, positioning cone sleeve, V-shaped expansion sleeve and wedge tight cone sleeve, positioning cone sleeve is sleeved on the support mandrel, V-shaped expansion sleeve is sleeved on the support mandrel and is located the side of positioning cone sleeve, V-shaped expansion sleeve includes first locating seat, connecting piece and V-shaped locating seat connected in proper order, and the taper surface of first locating seat is in abutment with positioning cone sleeve, wedge tight cone sleeve is slidably sleeved on the support mandrel, and the taper surface of wedge tight cone sleeve can be in abutment with the end of V-shaped locating seat away from first locating seat, and wedge tight cone sleeve moves close to or away from V-shaped locating seat, can make V-shaped locating seat expand or contract with the axle of support mandrel as the reference, when V-shaped locating seat is in the expansion state, the outer diameter of V-shaped locating seat expands and can cooperate with the V-shaped hole in the sphere to fix the sphere. The utility model is simple in overall structure, and sphere clamping operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of grinding balls, and in particular to a clamp and a device for grinding balls. Background Technology

[0002] The ball of a V-type floating ball valve differs from that of a conventional ball valve. The flow channel of a conventional ball valve is a straight through hole, while the flow channel of a V-type floating ball valve is half straight through hole and half V-shaped hole.

[0003] The ball in a V-type floating ball valve is a key component. The machining quality of the ball's dimensional accuracy, surface roughness, and roundness directly affects the valve's sealing performance, wear resistance, and service life. Currently, the machining process for the V-type floating ball valve ball is as follows: rough turning the spherical surface and finish turning the through hole for the flow channel on a CNC lathe; then milling a V-shaped hole on a vertical machining center; finally, using specialized tooling, finish turning and grinding the spherical surface; and finally, milling the R-shaped arc groove on the spherical surface. Due to the inherent structural characteristics of the ball and the incompatibility of existing machine tool fixtures, it is impossible to achieve proper fixation and clamping during the ball's forming process. Utility Model Content

[0004] This utility model provides a fixture and a device for grinding spheres to solve the problem that the spheres themselves are not compatible with existing machine tool fixtures and tooling, which makes it impossible to fix and clamp the spheres during the machining process.

[0005] This utility model discloses a clamp, comprising: a support mandrel, a positioning cone sleeve, a V-shaped expansion sleeve, and a wedge-tightening cone sleeve; the positioning cone sleeve is sleeved on the support mandrel; the V-shaped expansion sleeve is sleeved on the support mandrel and located on one side of the positioning cone sleeve; the V-shaped expansion sleeve includes a first positioning seat, a connecting member, and a V-shaped positioning seat connected in sequence, the first positioning seat abutting against the conical surface of the positioning cone sleeve; the wedge-tightening cone sleeve is slidably sleeved on the support mandrel, the conical surface of the wedge-tightening cone sleeve abutting against the end of the V-shaped positioning seat away from the first positioning seat, the wedge-tightening cone sleeve moves closer to or away from the V-shaped positioning seat, enabling the V-shaped positioning seat to expand or contract with the axis of the support mandrel as a reference, when the V-shaped positioning seat is in the expanded state, the outer diameter of the V-shaped positioning seat expands to cooperate with the V-shaped hole in the sphere to fix the sphere.

[0006] Optionally, the clamp further includes: a first fastener, which is sleeved on the support mandrel and threadedly connected to the support mandrel, and the first fastener is located on the side of the wedge-tightening cone sleeve away from the positioning cone sleeve; wherein, by manipulating the first fastener, the wedge-tightening cone sleeve is slidable on the support mandrel.

[0007] Optionally, a gasket is also provided between the first fastener and the wedge-shaped conical sleeve.

[0008] Optionally, the clamp further includes a limiting member, which is disposed radially on the outer periphery of the positioning cone sleeve to limit the ball in the horizontal direction.

[0009] Optionally, the clamp further includes a lever, which is inserted radially into the outer periphery of the support mandrel, and the lever is fixed to the support mandrel by a second fastener.

[0010] Optionally, the connector and the V-shaped positioning seat are provided with a plurality of first opening slots along the axial direction. The bottom of the first opening slot is located at the end of the connector away from the V-shaped positioning seat, and the opening of the first opening slot extends to the end of the V-shaped positioning seat to divide the V-shaped positioning seat into a plurality of independent parts.

[0011] Optionally, a plurality of second opening slots are formed on the first positioning seat along the axial direction. The bottom of the second opening slot extends to the connector. The second opening slot is located between two adjacent first opening slots. The opening of the second opening slot extends to the end of the first positioning seat to divide the first positioning seat into a plurality of independent parts.

[0012] Optionally, the bottom of the first opening groove and the second opening groove are arc-shaped structures.

[0013] Optionally, the V-shaped expansion sleeve is an integrally formed structure.

[0014] This utility model also discloses a device for grinding balls, including a ball grinding machine spindle, a tailstock, and the aforementioned clamp, wherein the clamp is disposed between the ball grinding machine spindle and the tailstock via the supporting spindle.

[0015] The advantages of the fixture and grinding ball device provided by this utility model are as follows: the supporting mandrel serves as the mounting base of the entire fixture, providing a mounting carrier for other components; the V-shaped expansion sleeve is fitted onto the supporting mandrel and located on one side of the positioning cone sleeve, including a first positioning seat, a connecting piece, and a V-shaped positioning seat, wherein the first positioning seat and the conical surface of the positioning cone sleeve abut against each other to ensure the initial positioning of the V-shaped expansion sleeve; the wedge-tightening cone sleeve is slidably fitted onto the supporting mandrel, and by controlling the wedge-tightening cone sleeve to move closer to or away from the V-shaped positioning seat, the V-shaped positioning seat can be driven to expand or contract with the axis of the supporting mandrel as a reference. Specifically, when the V-shaped positioning seat expands, it can precisely cooperate with the V-shaped hole in the ball, thereby achieving the fixation of the ball. This application achieves ball positioning by adapting the V-shaped expansion sleeve to the V-shaped hole inside the ball, thus fixing the ball on the fixture. The expansion of the V-shaped positioning seat can adapt to V-shaped holes of different sizes, providing strong versatility. The conical surface of the first positioning seat abuts against the positioning cone sleeve, ensuring the positioning accuracy of the fixture itself, thereby improving the accuracy of ball grinding and reducing problems such as spherical surface size error and non-roundness due to clamping deviation, thereby improving the sealing performance, wear resistance and service life of the ball valve. In summary, this embodiment has a simple overall structure and convenient ball clamping operation. Attached Figure Description

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 This is a cross-sectional structural diagram of the clamp provided in this embodiment of the utility model;

[0018] Figure 2 This is a side view of the V-shaped expansion sleeve provided in this embodiment of the utility model;

[0019] Figure 3 This is one of the schematic diagrams of the V-shaped expansion sleeve provided in this embodiment of the utility model;

[0020] Figure 4 This is the second schematic diagram of the V-shaped expansion sleeve provided in this embodiment of the utility model;

[0021] Figure 5 This is the third schematic diagram of the V-shaped expansion sleeve provided in this embodiment of the utility model.

[0022] In the diagram: 10, support mandrel; 101, square groove; 20, positioning cone sleeve; 30, V-shaped expansion sleeve; 310, first positioning seat; 3101, first conical hole; 320, connector; 330, V-shaped positioning seat; 3301, second conical hole; 301, first opening groove; 302, second opening groove; 40, wedge-tightening cone sleeve; 401, outer circular groove; 510, first fastener; 520, second fastener; 530, gasket; 610, limiting component; 620, lever; 70, ball. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] This utility model embodiment provides a clamp, such as Figures 1 to 5 As shown, the device includes a support mandrel 10, a positioning cone sleeve 20, a V-shaped expansion sleeve 30, and a wedge-tightening cone sleeve 40. The positioning cone sleeve 20 is sleeved on the support mandrel 10; the V-shaped expansion sleeve 30 is sleeved on the support mandrel 10 and located on one side of the positioning cone sleeve 20; the V-shaped expansion sleeve 30 includes a first positioning seat 310, a connecting piece 320, and a V-shaped positioning seat 330 connected in sequence, with the first positioning seat 310 abutting against the conical surface of the positioning cone sleeve 20; the wedge-tightening cone sleeve 40 is slidably sleeved. The tapered surface of the wedge-tightening tapered sleeve 40, which is located on the support spindle 10, can abut against the end of the V-shaped positioning seat 330 away from the first positioning seat 310. The movement of the wedge-tightening tapered sleeve 40 towards or away from the V-shaped positioning seat 330 can cause the V-shaped positioning seat 330 to expand or contract with the axis of the support spindle 10 as a reference. When the V-shaped positioning seat 330 is in the expanded state, the outer diameter of the V-shaped positioning seat 330 expands and can cooperate with the V-shaped hole in the ball 70 to fix the ball 70.

[0025] The supporting mandrel 10 serves as the mounting base for the entire fixture, providing a mounting carrier for other components. The V-shaped expansion sleeve 30 is fitted onto the supporting mandrel 10 and located on one side of the positioning cone sleeve 20. It includes a first positioning seat 310, a connector 320, and a V-shaped positioning seat 330. The first positioning seat 310 abuts against the conical surface of the positioning cone sleeve 20 to ensure the initial positioning of the V-shaped expansion sleeve 30. The wedge-tightening cone sleeve 40 is slidably fitted onto the supporting mandrel 10. By controlling the wedge-tightening cone sleeve 40 to move closer to or away from the V-shaped positioning seat 330, the V-shaped positioning seat 330 can be driven to expand or contract with the axis of the supporting mandrel 10 as a reference. Specifically, when the V-shaped positioning seat 330 expands, it can precisely engage with the V-shaped hole in the ball 70, thereby fixing the ball 70. This application achieves the positioning of the ball 70 by adapting the V-shaped expansion sleeve 30 to the V-shaped hole inside the ball 70, thereby fixing the ball 70 on the fixture. The expansion of the V-shaped positioning seat 330 can adapt to V-shaped holes of different sizes, which is highly versatile. The first positioning seat 310 and the conical surface of the positioning cone sleeve 20 abut against each other, which ensures the positioning accuracy of the fixture itself, thereby improving the accuracy of the ball 70 during grinding and reducing problems such as spherical size error and non-compliance with roundness caused by clamping deviation, thereby improving the sealing performance, wear resistance and service life of the ball valve. In summary, the overall structure of this embodiment is simple and the clamping operation of the ball 70 is convenient.

[0026] Reference Figure 3 and Figure 5In practical applications, the first positioning seat 310 has a first conical hole 3101 that matches the conical surface of the positioning cone sleeve 20, and the V-shaped positioning seat 330 has a second conical hole 3301 that matches the conical surface of the wedge-tightening cone sleeve 40, ensuring a stable fit between the two.

[0027] As an optional solution in this embodiment, refer to Figure 1 The fixture also includes a first fastener 510, which is sleeved on the support spindle 10 and threadedly connected to the support spindle 10. The first fastener 510 is located on the side of the wedge-tightening cone sleeve 40 away from the positioning cone sleeve 20. The first fastener 510 is used to slide the wedge-tightening cone sleeve 40 on the support spindle 10 by manipulating the first fastener 510.

[0028] This embodiment specifies the driving method for the wedge-tightening tapered sleeve 40. Precise control of the sliding of the wedge-tightening tapered sleeve 40 is achieved through the threaded first fastener 510. The expansion degree of the V-shaped positioning seat 330 can be finely adjusted according to the size of the V-shaped hole in the ball 70 to ensure appropriate clamping force on the ball 70. Simultaneously, the threaded connection has a self-locking function, providing strong stability and preventing slippage of the wedge-tightening tapered sleeve 40 due to vibration during processing, further improving processing accuracy. Operation is convenient, requiring no additional power equipment, reducing operational difficulty and equipment costs. In this embodiment, the first fastener 510 can be a nut; no specific limitation is made here.

[0029] As an optional solution in this embodiment, refer to Figure 1 A gasket 530 is also provided between the first fastener 510 and the wedge-tightening cone sleeve 40.

[0030] The shim 530 buffers the pressure between the first fastener 510 and the wedge-tightening cone sleeve 40, preventing the first fastener 510 from directly squeezing the wedge-tightening cone sleeve 40 and causing surface wear, thus extending the service life of the fixture. At the same time, the shim 530 fills the gap between the first fastener 510 and the wedge-tightening cone sleeve 40, ensuring that the force of the first fastener 510 is evenly transmitted to the wedge-tightening cone sleeve 40, making the wedge-tightening cone sleeve 40 slide smoothly, thereby ensuring the smooth expansion or contraction of the V-shaped positioning seat 330 and improving the clamping accuracy.

[0031] As an optional solution in this embodiment, refer to Figure 1 The fixture also includes a limiting member 610, which is located on the outer periphery of the positioning cone sleeve 20 along the radial direction of the positioning cone sleeve 20, and is used to limit the ball 70 in the horizontal direction.

[0032] The limiting member 610 can limit the ball 70 in the horizontal direction. Specifically, in actual application, the limiting member 610 is placed in the slot of the positioning cone sleeve 20, and then the ball 70 is installed. The ball 70 is moved so that the end face of the ball 70 contacts the limiting member 610, and the center line of the ball 70 is made to coincide with the center line of the V-shaped expansion sleeve 30. A wrench is used to hold the ball in the square groove 101 of the support spindle 10, and another wrench is used to tighten the first fastener 510 to push the wedge-tightening cone sleeve 40 forward. After the cone surface of the wedge-tightening cone sleeve 40 is wedged into the second cone hole 3301 in the V-shaped expansion sleeve 30 to a certain depth, the V-shaped expansion sleeve 30 is forced to expand, so that the outer diameter of the V-shaped expansion sleeve 30 is expanded and friction is generated between it and the V-shaped hole in the ball 70. The first fastener 510 is then tightened. After the ball 70 is fixed and tightened, remove the limiting piece 610; the limiting piece 610 is set radially along the positioning cone sleeve 20, with a reasonable structural design and strong practicality.

[0033] As an optional solution in this embodiment, refer to Figure 1 The fixture also includes a lever 620, which is inserted radially into the outer periphery of the support spindle 10 and fixed to the support spindle 10 by a second fastener 520.

[0034] The lever 620 facilitates the rotation of the support spindle 10 by the external drive component, thereby driving the ball 70 to rotate. The machining angle of the ball 70 can be adjusted without disassembling the fixture, improving machining efficiency. The lever 620 is fixed by the second fastener 520, which ensures that the lever 620 is firmly connected to the support spindle 10 and will not slip during rotation, thus ensuring the accuracy of angle adjustment. The structure is simple and easy to operate, reducing the labor intensity of operators and adapting to the needs of multi-position machining of spherical surfaces.

[0035] As an optional solution in this embodiment, refer to Figures 2 to 4 The connector 320 and the V-shaped positioning seat 330 have a plurality of first opening slots 301 formed along the axial direction. The bottom of the first opening slot 301 is located at the end of the connector 320 away from the V-shaped positioning seat 330. The opening of the first opening slot 301 extends to the end of the V-shaped positioning seat 330 to divide the V-shaped positioning seat 330 into a plurality of independent parts.

[0036] The design of the first opening groove 301, under the action of the wedge-tightening cone sleeve 40, can achieve uniform expansion and contraction, avoiding uneven expansion caused by excessive rigidity of the V-shaped positioning seat 330, ensuring the fit between the V-shaped positioning seat 330 and the V-shaped hole inside the ball 70, and improving clamping stability and positioning accuracy; multiple independent V-shaped positioning seats 330 parts can fit with different positions of the V-shaped hole respectively, adapting to the structural characteristics of the V-shaped hole, and further improving the clamping accuracy.

[0037] As an optional solution in this embodiment, refer to Figures 2 to 4 The first positioning seat 310 has a plurality of second opening slots 302 formed along the axial direction. The bottom of the second opening slot 302 extends to the connector 320. The second opening slot 302 is located between two adjacent first opening slots 301. The opening of the second opening slot 302 extends to the end of the first positioning seat 310 to divide the first positioning seat 310 into a plurality of independent parts.

[0038] The second opening groove 302 makes the first positioning seat 310 and the cone surface of the positioning cone sleeve 20 more closely and evenly abut, ensuring the initial positioning accuracy of the V-shaped expansion sleeve 30; multiple independent first positioning seats 310 can adapt to the cone surface structure of the positioning cone sleeve 20, avoiding inaccurate positioning due to assembly deviation, further improving the positioning stability of the fixture, and providing a reliable reference for the machining of the ball 70.

[0039] As an optional solution in this embodiment, refer to Figures 2 to 4 The bottom of the first opening groove 301 and the second opening groove 302 are arc-shaped structures.

[0040] The arc-shaped bottom design can avoid stress concentration at the bottom of the first opening groove 301 and the second opening groove 302, extend the service life of the V-shaped expansion sleeve 30, and prevent the first opening groove 301 and the second opening groove 302 from cracking due to long-term stress, which would cause the V-shaped expansion sleeve 30 to fail.

[0041] As an optional solution in this embodiment, the V-shaped expansion sleeve 30 is an integrally formed structure.

[0042] The one-piece molding structure avoids assembly deviations between the first positioning seat 310, the connecting piece 320, and the V-shaped positioning seat 330, ensuring the overall structural accuracy and coaxiality of the V-shaped expansion sleeve 30, thereby improving the positioning and clamping accuracy of the fixture. Simultaneously, the one-piece molding enhances the structural strength of the V-shaped expansion sleeve 30, reduces assembly steps, lowers production costs and assembly difficulty, and reduces the likelihood of component loosening, thus improving the stability and service life of the fixture. In this embodiment, the V-shaped expansion sleeve 30 can be made of elastic plastic; no specific limitation is made here.

[0043] This application also discloses a grinding device for grinding balls, including a grinding machine spindle (not shown in the figure), a tailstock (not shown in the figure), and the aforementioned clamp, wherein the clamp is disposed between the grinding machine spindle and the tailstock via a support spindle 10.

[0044] After the ball 70 is assembled with the fixture of this embodiment, the fixture is clamped between the main spindle and the tailstock center of the ball grinding machine, and the tailstock is used to tighten it. The main spindle of the ball grinding machine is rotated at low speed to check that the pin on the main spindle can drive the support spindle 10 to rotate synchronously through the lever 620. After a trial cut, the ball 70 is ground.

[0045] After the ball 70 is ground, use a sling to suspend the two ends of the mandrel 10 and loosen the tailstock center to lift it off the sling. Then, first use a wrench to loosen the first fastener 510 and remove the washer 530. Then, use a special tool to wedge the wedge-tightening tapered sleeve 40 out of the outer groove 401. The first opening groove 301 of the V-shaped expansion sleeve 30 returns to its original shape as the wedge force disappears. The outer diameter of the V-shaped expansion sleeve 30 shrinks and disengages from the V-shaped hole of the ball 70, allowing the ball 70 to be detached.

[0046] The ball 70 machining device for this V-shaped floating ball valve has the same structure and beneficial effects as the clamp in the foregoing embodiments. The structure and beneficial effects of the clamp have been described in detail in the foregoing embodiments and will not be repeated here.

[0047] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. A clamp, characterized in that, include: Support spindle; A positioning cone sleeve is fitted onto the support mandrel; A V-shaped expansion sleeve is fitted onto the support mandrel and located on one side of the positioning cone sleeve; the V-shaped expansion sleeve includes a first positioning seat, a connecting piece, and a V-shaped positioning seat connected in sequence, wherein the first positioning seat abuts against the conical surface of the positioning cone sleeve; A wedge-tightening cone sleeve is slidably fitted onto the support mandrel. The cone surface of the wedge-tightening cone sleeve can abut against the end of the V-shaped positioning seat away from the first positioning seat. The movement of the wedge-tightening cone sleeve toward or away from the V-shaped positioning seat can cause the V-shaped positioning seat to expand or contract with the axis of the support mandrel as a reference. When the V-shaped positioning seat is in the expanded state, the outer diameter of the V-shaped positioning seat expands so that it can cooperate with the V-shaped hole in the sphere to fix the sphere.

2. The clamp according to claim 1, characterized in that, The clamp also includes: The first fastener is sleeved on the support mandrel and threadedly connected to the support mandrel. The first fastener is located on the side of the wedge-tightening cone sleeve away from the positioning cone sleeve. The first fastener is manipulated to make the wedge-shaped cone sleeve slide on the support mandrel.

3. The clamp according to claim 2, characterized in that, A gasket is also provided between the first fastener and the wedge-tightening cone sleeve.

4. The clamp according to claim 3, characterized in that, The clamp also includes: A limiting member is provided radially on the outer periphery of the positioning cone sleeve to limit the sphere in the horizontal direction.

5. The clamp according to claim 4, characterized in that, The clamp also includes: A lever is inserted radially into the outer periphery of the support spindle, and the lever is fixed to the support spindle by a second fastener.

6. The clamp according to any one of claims 1 to 5, characterized in that, The connector and the V-shaped positioning seat have a plurality of first opening slots formed along the axial direction. The bottom of the first opening slot is located at the end of the connector away from the V-shaped positioning seat, and the opening of the first opening slot extends to the end of the V-shaped positioning seat to divide the V-shaped positioning seat into a plurality of independent parts.

7. The clamp according to claim 6, characterized in that, The first positioning seat has a plurality of second opening slots formed along the axial direction. The bottom of the second opening slots extends to the connector. The second opening slots are located between two adjacent first opening slots. The openings of the second opening slots extend to the end of the first positioning seat to divide the first positioning seat into a plurality of independent parts.

8. The clamp according to claim 7, characterized in that, The bottoms of the first and second opening slots are arc-shaped.

9. The clamp according to claim 7, characterized in that, The V-shaped expansion sleeve is a one-piece molded structure.

10. A device for grinding spheres, characterized in that, The invention includes a ball mill spindle, a tailstock, and a clamp as described in any one of claims 1 to 9, wherein the clamp is disposed between the ball mill spindle and the tailstock via the support spindle.

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