Ball clamping tool

Abstract

The utility model discloses a ball clamping tool, relates to the field of ball valve ball machining devices, and solves the problems of inconvenience in clamping and the like. Comprising a clamping rod, a central shaft rod, an expansion column and an expansion pressure plate, the expansion column at least comprises two column blocks which are surrounded and separated from each other, and the two sides of each column block in the axial direction are respectively provided with a sunken inclined plane which is sunken inwards; the outer side end of the clamping rod is provided with a first external expansion slope, the center of the expansion pressing disc is provided with a second external expansion slope, and the first external expansion slope and the second external expansion slope are matched with the inwards-sunken slopes on the two sides of the expansion column in a slope staggered mode respectively. And the expansion pressure plate is pressed to move towards the direction of the clamping rod and forces the column block to move outwards in the radial direction through staggered matching of the inclined surfaces, so that the outer peripheral surface of the expansion column abuts against the ball to fix the ball. The clamping rod can be directly installed on a chuck of a machine tool, the expansion pressing plate is pressed in through an ejector pin or an ejector rod and the like, the original design of the machine tool does not need to be changed, and therefore machining cost is reduced, and operation is simpler and more convenient.

Description

Technical Field

[0001] The utility model relates to the field of ball valve ball processing devices, in particular to a ball clamping tool. Background Art

[0002] The sealing performance of the ball valve depends largely on the accuracy of the valve ball. The roundness, surface roughness, machining dimensional accuracy and other factors of the ball will directly affect the sealing, strength, wear resistance and service life of the ball valve product. In the process of ball processing, the outer circle of the ball is particularly important. In the prior art, the outer circle of the ball is usually turned by a lathe, but due to the characteristics of the ball itself, it is difficult to fix and clamp it during the processing and forming process. Sometimes, the chuck of the lathe needs to be modified to complete the clamping work, which is not only inconvenient in the clamping method, but also increases the processing cost. Summary of the invention

[0003] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a spherical clamping tool to solve the problems of inconvenient clamping and high processing cost.

[0004] The technical solution of the utility model includes: comprising a clamping rod for clamping a machine tool, a central axis rod arranged in a collinear manner is installed on the outer end of the clamping rod, an expandable expansion column is arranged on the periphery of the central axis rod, and an expansion pressure plate arranged in a collinear manner is arranged on the outer end of the central axis rod; the expansion column comprises at least two column blocks which are circumferentially surrounded and separated from each other, the column block can move along the radial direction of the expansion column, and both sides of the column block in the axial direction respectively have inwardly recessed inclined surfaces; the outer end of the clamping rod has a first outwardly expanding inclined surface protruding toward the column block, and a second outwardly expanding inclined surface protruding toward the column block is arranged at the center position of the expansion pressure plate, the first outwardly expanding inclined surface and the second outwardly expanding inclined surface respectively form an inclined surface staggered match with the inwardly recessed inclined surfaces on both sides of the expansion column, and the expansion pressure plate is pressed to move toward the direction of the clamping rod, and the column block is forced to move radially outward through the above-mentioned inclined surface staggered match, so that the outer peripheral surface of the expansion column is against the sphere to form a fixation for the sphere.

[0005] By adopting the above technical scheme, the expansion pressure plate is pressed and the corresponding surfaces are staggered by using the inclined surface, so that the column block is forced to move radially outward, so that the column block is against the flow channel wall of the sphere, thereby achieving the function of clamping and positioning the sphere; the clamping rod can be directly installed on the chuck of the machine tool, and the expansion pressure plate can be pressed in by using a pin or a push rod, without changing the original design of the machine tool, thereby reducing the processing cost and making the operation simpler and more convenient; in addition, the column blocks are separated from each other, the expansion column has a larger expansion range, and can be applied to a larger range of sphere flow channel inner diameters, and has a wider range of use.

[0006] In a possible design, a guide column is integrally provided at the shaft position of the central shaft, the number of the guide columns and the column blocks are the same and correspond to each other, a guide hole is opened at the inner circle position of the column block, the guide column is movably inserted into the guide hole and slidingly cooperates with the hole wall of the guide hole.

[0007] The above design can guide the movement of the column block and determine the movement trajectory of the column block, while also preventing the column block from falling off during normal operation, making the structural design more reliable and stable.

[0008] In a possible design, a tension spring is installed between the guide post and the bottom of the guide hole, and two ends of the tension spring are respectively fixed to the guide post and the bottom of the guide hole.

[0009] With the above design, the tension of the extension spring can pull the column block back to its original position, thereby preventing the guide column from being separated from the guide hole and ensuring the normal movement of the column block.

[0010] In a possible design, a tapered hole for the machine tool ejector to hold is provided at the center of the outer side surface of the extended pressure plate.

[0011] With the above design, the end of the ejector pin is pushed into the tapered hole to expand the expansion column. The ejector pin can ensure the coaxiality of the tooling and the rotation center of the machine tool, thereby improving the roundness of the spherical surface processing and improving the accuracy of the produced sphere.

[0012] In a possible design, a limiting sleeve is integrally provided on the inner side surface of the extension pressure plate, and the limiting sleeve is movably outermostly disposed on one end of the central shaft.

[0013] With the above design, during the clamping process, the limiting sleeve can be sleeved on the central shaft, so that the extended pressure plate is not easy to separate from the tooling, and the workers' contact and participation are reduced when the extended pressure plate is pressed, thereby ensuring the workers' safety and making the operation more convenient.

[0014] In a possible design, the clamping rod and the central shaft rod are threadedly connected to each other.

[0015] The above design is used to adjust the position of the central axis to adapt to actual processing scenarios and improve applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a clamping state of a specific embodiment of the utility model;

[0017] Figure 2 The structure of the specific embodiment of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 3 The structure of the specific embodiment of the utility model is shown in FIG. Figure 2 ;

[0019] Figure 4 It is a cross-sectional view of a specific embodiment of the utility model;

[0020] Figure 5 It is an exploded view of a specific embodiment of the utility model;

[0021] Among them, 1. Clamping rod; 2. Central shaft rod; 3. Expansion column; 4. Extended pressure plate; 31. Column block; 311. Indented slope; 11. First outward expansion slope; 41. Second outward expansion slope; 21. Guide column; 312. Guide hole; 5. Tension spring; 42. Conical hole; 43. Limit sleeve; 6. Ejector pin; 7. Sphere. DETAILED DESCRIPTION

[0022] like Figure 1-5 The clamping tool for a sphere shown in the figure includes a clamping rod 1 for clamping a machine tool, a central shaft rod 2 arranged in a collinear manner is installed on the outer end of the clamping rod 1, and the outer end is the end away from the clamping chuck of the machine tool; an expansion column 3 that can be expanded is arranged on the periphery of the central shaft rod 2, and the expansion column 3 is a hollow structure, and a collinearly arranged expansion plate 4 is arranged on the outer end of the central shaft rod 2, and the central axis of the central shaft rod 2 and the expansion plate 4 are arranged in a collinear manner; the expansion column 3 includes at least two column blocks 31 that are circumferentially surrounded and separated from each other, and three are shown in the figure, and the column block 31 can move along the radial direction of the expansion column 3, and the two sides of the column block 31 in the axial direction respectively have a center inward concave The outer end of the clamping rod 1 has a first outward-expanding inclined surface 11 protruding toward the column block 31, and the center position of the expansion pressure plate 4 is provided with a second outward-expanding inclined surface 41 protruding toward the column block 31. The first outward-expanding inclined surface 11 and the second outward-expanding inclined surface 41 respectively form an inclined surface staggered match with the inward-expanding inclined surfaces 311 on both sides of the expansion column 3. When the expansion pressure plate 4 is pressurized, it moves toward the clamping rod 1, and the two corresponding inclined surfaces in contact are squeezed against each other, thereby forcing the inward-expanding inclined surface 311 to stagger outward to form an inclined surface staggered match, thereby forcing the column block 31 to move radially outward, so that the outer peripheral surface of the expansion column 3 is against the sphere 7 to fix the sphere 7. During clamping, the clamping rod 1 is installed on the chuck of a lathe or other machine tool, and the sphere 7 is installed on the periphery of the expansion column 3. The ejector pin 6 is close to the expansion pressure plate 4 and presses inward. The first outward expansion bevel 11 and the second outward expansion bevel 41 are respectively staggered toward the inward recessed bevel 311 on both sides of the expansion column 3, forcing the column block 31 to move radially outward. The gap between adjacent column blocks 31 gradually expands until the column block 31 presses against the flow channel wall inside the sphere 7, thereby fixing the clamped sphere 7 to process the outer circle of the valve ball 7.

[0023] The shaft of the central shaft 2 is provided with a guide column 21, which is the same in number as the column block 31 and corresponds to each other. In the figure, there are three guide columns 21 evenly distributed in the circumferential position of the central shaft 2; the inner circle of the column block 31 is provided with a guide hole 312, and the guide column 21 is movably inserted into the guide hole 312 and slidably cooperates with the hole wall of the guide hole 312. The moving direction of the column block 31 is determined by the guide column 21 and the guide hole 312 to prevent the column block 31 from falling off during normal operation.

[0024] A tension spring 5 is installed between the guide column 21 and the bottom of the guide hole 312, and the two ends of the tension spring 5 are respectively fixed to the guide column 21 and the bottom of the guide hole 312. When the column block 31 is forced to move outward, the tension spring 5 is in a tension state. When the column block 31 is unloaded, the tension of the tension spring 5 pulls the column block 31 back to its original position, and the ball 7 is removed.

[0025] A tapered hole 42 for the machine tool ejector 6 to support is provided at the center position of the outer side surface of the expansion pressure plate 4. The end of the ejector 6 is inserted into the tapered hole 42 to ensure that the central axis of the expansion pressure plate 4 and the expansion column 3 is in line with the rotation center of the machine tool, thereby improving the accuracy of the produced sphere 7.

[0026] The inner side of the expansion platen 4 is integrally provided with a limiting sleeve 43, which is movably sleeved on one end of the central shaft 2. During the clamping process, the limiting sleeve 43 is sleeved on the central shaft 2, so that the expansion platen 4 is not easy to be separated from the tooling, and the assembly and disassembly are convenient.

[0027] The clamping rod 1 and the central shaft rod 2 are threadedly connected to each other, and the position of the central shaft rod 2 can be adjusted by the thread. After adjustment, the central shaft rod 2 needs to be fixed to prevent the central shaft rod 2 from being out of position during processing.

Claims

1. A ball clamping tool, characterized in that: It comprises a clamping rod for clamping the machine tool, the outer end of the clamping rod is installed with a central shaft rod arranged in a collinear manner, the periphery of the central shaft rod is provided with an expandable expansion column, and the outer end of the central shaft rod is provided with an expansion platen arranged in a collinear manner; The expansion column comprises at least two column blocks which are circumferentially enclosed and separated from each other, the column blocks can move along the radial direction of the expansion column, and the two sides of the column blocks in the axial direction respectively have inwardly concave inclined surfaces; The outer end of the clamping rod has a first outward-expanding inclined surface protruding toward the column block, and the center position of the expansion pressure plate is provided with a second outward-expanding inclined surface protruding toward the column block. The first outward-expanding inclined surface and the second outward-expanding inclined surface respectively form an inclined surface staggered fit with the inward-expanding inclined surfaces on both sides of the expansion column. The expansion pressure plate is pressed to move toward the clamping rod, and the column block is forced to move radially outward through the above-mentioned inclined surface staggered fit, so that the outer peripheral surface of the expansion column is against the sphere to fix the sphere.

2. The ball clamping tool according to claim 1, characterized in that: A guide column is integrally provided at the shaft position of the central shaft, the number of the guide columns is consistent with that of the column block and they correspond to each other, a guide hole is opened at the inner circle position of the column block, the guide column is movably inserted into the guide hole and slidingly cooperates with the hole wall of the guide hole.

3. The ball clamping tool according to claim 2, characterized in that: A tension spring is installed between the guide column and the bottom of the guide hole, and two ends of the tension spring are respectively fixed on the guide column and the bottom of the guide hole.

4. The ball clamping tool according to claim 1 or 3, characterized in that: A tapered hole for the machine tool ejector to hold is provided at the center of the outer side surface of the extended pressure plate.

5. The ball clamping tool according to claim 4, characterized in that: A limiting sleeve is integrally arranged on the inner side surface of the extended pressure plate, and the limiting sleeve is movably sleeved on one end of the central shaft.

6. The ball clamping tool according to claim 1 or 3, characterized in that: The clamping rod and the central shaft rod are threadedly connected to each other.

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