Clamp for improving turning efficiency and precision of standing wave waveguide unit

Abstract

The utility model provides a clamp for improving turning efficiency and precision of a standing wave waveguide unit, and belongs to the technical field of lathe machining. The clamp comprises a clamp main body which is provided with a planar end face and a central through hole; the multiple pairs of side plates are selectively and detachably installed on the end face, at least one of the thickness and the width of any two pairs of side plates in the multiple pairs of side plates is different, and any one pair of side plates in the multiple pairs of side plates is suitable for limiting a containing cavity used for containing a standing wave waveguide unit workpiece after being installed on the end face; the two groups of pressing plates are detachably mounted on the side plates so as to abut against the standing wave waveguide unit workpiece in the accommodating cavity; a plurality of counterweights selectively and detachably mounted to the end face or the side plate; and a plurality of mandrels. Standing wave waveguide unit workpieces of different specifications can be clamped only through one clamp, the clamp does not need to be aligned again, and turning efficiency and precision of the standing wave waveguide unit workpieces are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lathe processing, in particular to a clamp used for improving the turning efficiency and precision of a standing wave guide unit. Background Art

[0002] Medical standing wave accelerators can be used for cancer treatment and medical imaging, and the accuracy and effectiveness of their high-energy particle beams make them an important tool for modern radiotherapy. Medical standing wave accelerators usually include multiple standing wave waveguide units, which have a roughly rectangular shape, but their sizes vary. Medical standing wave accelerators have very high requirements for the surface finish of the center of the acceleration cavity of the standing wave waveguide unit, usually less than 0.02 microns, which places high demands on the accuracy of the turning process for machining the standing wave waveguide unit. Lathe processing is not suitable for asymmetric parts, so special fixtures need to be designed to meet the lathe processing requirements.

[0003] At present, when turning standing wave guide unit workpieces of different sizes, different fixtures are required to clamp standing wave guide unit workpieces of different sizes because the center of gravity of the standing wave guide unit workpiece must be ensured to be at the center of the lathe. Therefore, when processing standing wave guide unit workpieces of different sizes, it takes a long time to replace and realign the fixtures, and the accuracy of alignment will affect the processing accuracy. Installation errors will lead to a decrease in the processing qualification rate.

[0004] CN207139380U and CN210476234U disclose technical solutions that do not require overall replacement of fixtures when turning workpieces of different specifications. Utility Model Content

[0005] Based on this, it is necessary to provide a fixture for improving the turning efficiency and accuracy of the standing wave waveguide unit workpiece.

[0006] A fixture for improving the turning efficiency and precision of a standing wave guide unit, comprising:

[0007] A fixture body, the fixture body having a planar end surface, the fixture body being provided with a central through hole extending in a first direction perpendicular to the end surface, the central through hole being adapted to accommodate a spring chuck mounted on the lathe spindle when the fixture body is mounted on the lathe spindle;

[0008] a plurality of pairs of side plates, the plurality of pairs of side plates being adapted to be selectively and detachably mounted to the end surface, at least one of the thickness and the width of any two pairs of side plates being different, and any pair of side plates among the plurality of pairs of side plates being adapted to be symmetrically arranged on a first side and a second side of the central through hole opposite to each other in a second direction perpendicular to the first direction after being mounted to the end surface, and having a thickness direction of the pair of side plates parallel to the first direction and a width direction parallel to the second direction, thereby defining an accommodating cavity for accommodating a standing waveguide unit workpiece between the pair of side plates;

[0009] Two groups of pressing plates, the two groups of pressing plates being adapted to be detachably mounted on the surfaces of any pair of side plates among the plurality of pairs of side plates, which are away from the end surface, after the pair of side plates among the plurality of pairs of side plates are mounted on the end surface, and extending from the surface to the top of the accommodating cavity, so as to abut against the standing wave guide unit workpiece accommodated in the accommodating cavity;

[0010] a plurality of counterweights adapted to be selectively and removably mounted to the end surface or the side panel; and

[0011] A plurality of mandrels, wherein the plurality of mandrels are suitable for being selectively and detachably mounted to the spring chuck, wherein each mandrel of the plurality of mandrels comprises a cylindrical shoulder and a first cylindrical extension and a second cylindrical extension respectively located at opposite ends of the cylindrical shoulder, wherein the plurality of the first cylindrical extensions and the plurality of the cylindrical shoulders of the plurality of mandrels have the same size, and at least one of the length and the diameter of the plurality of the cylindrical shoulders of the plurality of mandrels is different, wherein the first cylindrical extension is suitable for being detachably inserted into the spring chuck, and the second cylindrical extension is suitable for being inserted into the center hole of the standing wave guide unit workpiece.

[0012] In some embodiments, at least two of the plurality of weights have different weights.

[0013] In some embodiments, each group of pressure plates includes two pressure plates, and when the side plate is installed to the end surface, the two pressure plates are suitable for being installed to the surface of the side plate facing away from the end surface on the third and fourth sides of the central through hole opposite to each other in a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0014] In some embodiments, the end surface is provided with two groups of first side panel mounting holes extending along the first direction, and the two groups of first side panel mounting holes are respectively located on the first side and the second side of the central through hole; each side panel is provided with a group of second side panel mounting holes extending along its thickness direction, and the positions of the group of second side panel mounting holes on the side panel correspond to the positions of a group of first side panel mounting holes in the two groups of first side panel mounting holes on the end surface; the clamp also includes two groups of side panel screws, and each group of side panel screws is suitable for passing through the corresponding group of second side panel mounting holes and the group of first side panel mounting holes in sequence to mount the side panel to the end surface.

[0015] In some embodiments, the end surface is provided with two groups of first pressure plate mounting holes extending along the first direction, and the two groups of first pressure plate mounting holes are respectively located on the first side and the second side of the central through hole; each group of first pressure plate mounting holes includes at least one pressure plate mounting hole located on the third side of the central through hole and at least one pressure plate mounting hole located on the fourth side of the central through hole; each side plate is provided with a group of second pressure plate mounting holes extending along its thickness direction, and the position of the group of second pressure plate mounting holes on the side plate corresponds to the position of a group of first pressure plate mounting holes in the two groups of first pressure plate mounting holes on the end surface; each pressure plate is provided with a third pressure plate mounting hole; the clamp includes four pressure plate screws; when the side plate is installed on the end surface, the pressure plate screw is suitable for passing through the third pressure plate mounting hole and then passing through the corresponding second pressure plate mounting hole and the first pressure plate mounting hole in sequence, so as to install the pressure plate on the surface of the side plate facing away from the end surface.

[0016] In some embodiments, each group of the first pressure plate mounting holes includes at least two pressure plate mounting holes located on the third side or the fourth side of the central through hole, and the number of the second pressure plate mounting holes in the group of second pressure plate mounting holes on each side plate of at least one pair of side plates among the multiple pairs of side plates is the same as the number of the first pressure plate mounting holes in each group of the first pressure plate mounting holes.

[0017] In some embodiments, the clamp body is provided with a plurality of first clamp mounting holes extending along a first direction perpendicular to the end face and arranged around the central through hole, and the clamp also includes a plurality of clamp screws, which are suitable for respectively passing through the plurality of first clamp mounting holes to mount the clamp body to the lathe spindle of the lathe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional schematic diagram of a fixture for improving the turning efficiency and precision of a standing wave guide unit according to an embodiment of the utility model;

[0019] Figure 2 is a front view schematic diagram of a fixture for improving the turning efficiency and precision of a standing wave guide unit according to an embodiment of the utility model;

[0020] Figure 3 is a three-dimensional schematic diagram of a clamp body of a clamp according to an embodiment of the utility model;

[0021] Figure 4 is a front view schematic diagram of a clamp body of a clamp according to an embodiment of the utility model;

[0022] Figure 5 It is a partial three-dimensional schematic diagram of a lathe spindle equipped with a spring chuck according to an embodiment of the utility model;

[0023] Figure 6 is a perspective schematic diagram of a fixture body mounted on a lathe spindle according to an embodiment of the utility model;

[0024] Fig. 7A and Figure 7B Schematic diagram of using a fixture to install different standing wave guide unit workpieces. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] The utility model provides a fixture for improving the turning efficiency and precision of a standing wave guide unit workpiece. Figure 1 and Figure 2 The clamp includes a clamp body 100, multiple pairs of side plates 200, two groups of pressure plates 300, multiple counterweights 400, multiple core shafts 500, multiple clamp screws 610, two groups of side plate screws 620 and two groups of pressure plate screws 630.

[0027] See also Figure 3 and Figure 4 The clamp body 100 has a planar end surface 101. The clamp body 100 is provided with a central through hole 102 extending in a first direction Z perpendicular to the end surface 101 and a plurality of first clamp mounting holes 110 arranged at intervals (preferably, evenly) around the central through hole 102. Figure 5 and Figure 6, a plurality of clamp screws 610 are adapted to sequentially pass through a plurality of first clamp mounting holes 110 provided on the clamp body 100 and a plurality of second clamp mounting holes 11 provided on the lathe spindle 10 to fix the clamp body 100 to the lathe spindle 10. When the clamp body 100 is fixedly mounted to the lathe spindle 10, the central through hole 102 is adapted to accommodate the spring chuck 20 mounted on the lathe spindle 10.

[0028] The plurality of pairs of side plates 200 are selectively and detachably mounted to the end surface 101. After any pair of side plates 200 among the plurality of pairs of side plates 200 is mounted to the end surface 101, the pair of side plates 200 are symmetrically arranged at the first side and the second side of the central through hole 102 which are opposite in the second direction X which is perpendicular to the first direction Z, and the thickness of the pair of side plates 200 is parallel to the first direction Z and the width is parallel to the second direction X, so that a space for accommodating the standing waveguide unit workpiece 30 (see Fig. 7A and Figure 7B Any two pairs of side plates 200 among the plurality of pairs of side plates 200 have at least one of a thickness and a width that is different, thereby forming a housing cavity with different thicknesses and widths to accommodate the standing wave guide unit workpieces 30 with different thicknesses and widths.

[0029] Two groups of first side panel mounting holes 120 extending along the first direction Z may be provided on the end surface 101. The two groups of first side panel mounting holes 120 are respectively located on the first side and the second side of the central through hole 102. Each group of first side panel mounting holes 120 may include one, two or more first side panel mounting holes 120. Each side panel 200 is provided with a group of second side panel mounting holes 220 extending along its thickness direction. The position of a group of second side panel mounting holes 220 on the side panel 200 corresponds to the position of a group of first side panel mounting holes 120 in the two groups of first side panel mounting holes 120 on the end surface 101. Each group of side panel screws 620 may pass through the corresponding group of second side panel mounting holes 220 and the group of first side panel mounting holes 120 in sequence to mount the side panel 200 to the end surface 101. The number of each group of side panel screws may be the same as the number of each group of first side panel mounting holes 120 or each group of second side panel mounting holes 220, for example, one, two or more.

[0030] After any pair of side plates 200 among the multiple pairs of side plates 200 is installed on the end face 101, the two groups of pressure plates 300 are respectively detachably installed on the surface of the pair of side plates 200 away from the end face 101, and extend from the surface to the top of the accommodating cavity to abut the standing wave waveguide unit workpiece 30 accommodated in the accommodating cavity, thereby clamping the standing wave waveguide unit workpiece 30.

[0031] Each set of pressing plates 300 may include two pressing plates 300. When the side plate 200 is mounted on the end surface 101, the two pressing plates 300 are symmetrically mounted on the surface of the side plate 200 away from the end surface 101 on the third side and the fourth side of the central through hole 102 that are opposite in the third direction Y. The third direction Y is perpendicular to the first direction Z and the second direction X. In this way, the four pressing plates 300 of the two sets of pressing plates 300 can be symmetrically arranged on the first side, the second side, the third side and the fourth side of the central through hole 102 and clamp the standing wave guide unit workpiece 30, thereby achieving a stable clamping of the standing wave guide unit workpiece, such as Fig. 7A and Figure 7B shown.

[0032] Two groups of first pressure plate mounting holes 130 extending along the first direction Z may be provided on the end surface 101. The two groups of first pressure plate mounting holes 130 are respectively located on the first side and the second side of the central through hole 102. Each group of first pressure plate mounting holes 130 includes at least one pressure plate mounting hole 130 located on the third side of the central through hole 102 and at least one pressure plate mounting hole 130 on the fourth side. Each side plate 200 is provided with a group of second pressure plate mounting holes 230 extending along the thickness direction thereof. The position of a group of second pressure plate mounting holes 230 on the side plate 200 corresponds to the position of a group of first pressure plate mounting holes 130 in the two groups of first pressure plate mounting holes 130 on the end surface 101. A third pressure plate mounting hole 330 is provided on each pressure plate 300. The clamp may include four pressure plate screws 630. When the side plate 200 is installed on the end face 101 , the pressure plate screw 630 is suitable for passing through the third pressure plate mounting hole 330 and then through the corresponding second pressure plate mounting hole 230 and the first pressure plate mounting hole 130 in sequence to install the pressure plate 300 on the surface of the side plate 200 away from the end face 101 .

[0033] In one embodiment, each group of first pressing plate mounting holes 130 includes at least two pressing plate mounting holes 130 located on the third side or the fourth side of the central through hole 102. The number of a group of second pressing plate mounting holes 230 of at least one pair of side plates 200 among the multiple pairs of side plates 200 is the same as the number of each group of first pressing plate mounting holes 130. That is, each group of first pressing plate mounting holes 130 includes at least three first pressing plate mounting holes 130, and the at least three first pressing plate mounting holes 130 are arranged at intervals in the third direction Y. In this way, the distance between the installation positions of the two pressing plates 300 in the third direction Y can be adjusted, so that standing wave guide unit workpieces of different lengths can be clamped, so that the fixture can clamp standing wave guide unit workpieces of different lengths.

[0034] A plurality of counterweights 400 are selectively and detachably mounted to the end face 101 or the side plate 200. At least two of the plurality of counterweights 400 have at least one of a weight and a size that is different. The counterweight can be selected according to the size and weight of the standing wave guide unit workpiece 30 to be processed so that the center of gravity of the fixture and the standing wave guide unit workpiece 30 is maintained at the center of the lathe spindle 10, thereby reducing the center of gravity offset during processing and the centrifugal force during rotation, reducing lathe vibration, improving lathe processing accuracy, and improving the surface finish of the acceleration chamber. Different numbers of counterweights 400 or counterweights 400 of different weights and / or sizes can be mounted to the end face 101 or the side plate 200 as needed.

[0035] A plurality of mandrels 500 are selectively and detachably mounted to the spring chuck 20. Each of the plurality of mandrels 500 includes a cylindrical shoulder 520 and a first cylindrical extension 510 and a second cylindrical extension 530 respectively located at opposite ends of the cylindrical shoulder 520. The first cylindrical extension 510 and the cylindrical shoulder 520 of the plurality of mandrels 500 are identical, and the second cylindrical extension 530 of the plurality of mandrels 500 have different lengths and / or diameters. The standing wave guide unit workpiece 30 generally has a central hole located at the bottom end of the acceleration cavity. Before the standing wave guide unit workpiece 30 is placed in the accommodating cavity defined by the side plate 200, the first cylindrical extension 510 of the mandrel 500 may be inserted into the spring chuck 20 accommodated in the central through hole 102, so that the spring chuck clamps the first cylindrical extension 510. When the standing wave guide unit workpiece 30 is placed in the accommodating cavity defined by the side plate 200, the second cylindrical extension 530 of the mandrel 500 can be inserted into the central hole at the bottom end of the accelerating cavity of the standing wave guide unit workpiece 30. When processing the accelerating cavity of different standing wave guide unit workpieces 30, the mandrel 500 can be installed with the diameter of the second cylindrical extension 530 corresponding to the diameter of the central hole of the standing wave guide unit workpiece 30 and the length corresponding to the depth of the central hole of the standing wave guide unit workpiece 30.

[0036] The utility model can clamp standing wave guide unit workpieces of different specifications with only one clamp. Therefore, when turning standing wave guide unit workpieces of different specifications, only the side plates, counterweights or mandrels need to be replaced, and there is no need to realign the clamp, thereby improving the turning efficiency and accuracy of the standing wave guide unit workpiece.

[0037] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fixture for improving the turning efficiency and precision of a standing wave guide unit, characterized in that: The fixture comprises: A fixture body, the fixture body having a planar end surface, the fixture body being provided with a central through hole extending in a first direction perpendicular to the end surface, the central through hole being adapted to accommodate a spring chuck mounted on the lathe spindle when the fixture body is mounted on the lathe spindle; a plurality of pairs of side plates, the plurality of pairs of side plates being adapted to be selectively and detachably mounted to the end surface, at least one of the thickness and the width of any two pairs of side plates being different, and any pair of side plates among the plurality of pairs of side plates being adapted to be symmetrically arranged on a first side and a second side of the central through hole opposite to each other in a second direction perpendicular to the first direction after being mounted to the end surface, and having a thickness direction of the pair of side plates parallel to the first direction and a width direction parallel to the second direction, thereby defining an accommodating cavity for accommodating a standing waveguide unit workpiece between the pair of side plates; Two groups of pressing plates, the two groups of pressing plates being adapted to be detachably mounted on the surfaces of any pair of side plates among the plurality of pairs of side plates, which are away from the end surface, after the pair of side plates among the plurality of pairs of side plates are mounted on the end surface, and extending from the surface to the top of the accommodating cavity, so as to abut against the standing wave guide unit workpiece accommodated in the accommodating cavity; a plurality of counterweights adapted to be selectively and removably mounted to the end surface or the side panel; and A plurality of mandrels, wherein the plurality of mandrels are suitable for being selectively and detachably mounted to the spring chuck, wherein each mandrel of the plurality of mandrels comprises a cylindrical shoulder and a first cylindrical extension and a second cylindrical extension respectively located at opposite ends of the cylindrical shoulder, wherein the plurality of the first cylindrical extensions and the plurality of the cylindrical shoulders of the plurality of mandrels have the same size, and at least one of the length and the diameter of the plurality of the cylindrical shoulders of the plurality of mandrels is different, wherein the first cylindrical extension is suitable for being detachably inserted into the spring chuck, and the second cylindrical extension is suitable for being inserted into the center hole of the standing wave guide unit workpiece.

2. The clamp according to claim 1, characterized in that: At least two of the plurality of weights have different weights.

3. The clamp according to claim 1, characterized in that: Each group of pressure plates includes two pressure plates. When the side plate is installed to the end face, the two pressure plates are suitable for being installed to the surface of the side plate facing away from the end face on the third and fourth sides of the central through hole opposite to each other in a third direction, and the third direction is perpendicular to the first direction and the second direction.

4. The clamp according to claim 3, characterized in that: The end surface is provided with two groups of first side plate mounting holes extending along the first direction, and the two groups of first side plate mounting holes are respectively located on the first side and the second side of the central through hole; Each side plate is provided with a group of second side plate mounting holes extending in the thickness direction thereof, and the positions of the group of second side plate mounting holes on the side plate correspond to the positions of a group of first side plate mounting holes in the two groups of first side plate mounting holes on the end surface; The clamp further comprises two groups of side panel screws, each group of side panel screws being adapted to sequentially pass through the corresponding group of second side panel mounting holes and the group of first side panel mounting holes to mount the side panel to the end surface.

5. The clamp according to claim 4, characterized in that: The end surface is provided with two groups of first pressing plate mounting holes extending along the first direction, and the two groups of first pressing plate mounting holes are respectively located on the first side and the second side of the central through hole; Each group of the first pressing plate mounting holes includes at least one pressing plate mounting hole located on the third side of the central through hole and at least one pressing plate mounting hole located on the fourth side of the central through hole; Each side plate is provided with a group of second pressing plate mounting holes extending in the thickness direction thereof, and the positions of the group of second pressing plate mounting holes on the side plate correspond to the positions of a group of first pressing plate mounting holes in the two groups of first pressing plate mounting holes on the end surface; Each pressing plate is provided with a third pressing plate mounting hole; The clamp includes four pressure plate screws; When the side plate is installed on the end surface, the pressure plate screw is suitable for passing through the third pressure plate mounting hole and then passing through the corresponding second pressure plate mounting hole and the first pressure plate mounting hole in sequence to install the pressure plate on the surface of the side plate away from the end surface.

6. The clamp according to claim 5, characterized in that: Each group of the first pressure plate mounting holes includes at least two pressure plate mounting holes located on the third side or the fourth side of the central through hole, and the number of the second pressure plate mounting holes in the group of second pressure plate mounting holes on each side plate of at least one pair of side plates among the multiple pairs of side plates is the same as the number of the first pressure plate mounting holes in each group of the first pressure plate mounting holes.

7. The clamp according to claim 1, characterized in that: The clamp body is provided with a plurality of first clamp mounting holes extending along a first direction perpendicular to the end face and arranged around the central through hole. The clamp also includes a plurality of clamp screws, which are suitable for respectively passing through the plurality of first clamp mounting holes to mount the clamp body to the lathe spindle of the lathe.

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