CN112264931B - Self-adaptation type and variable test piece's of size anchor clamps of polishing - Google Patents
Self-adaptation type and variable test piece's of size anchor clamps of polishing Download PDFInfo
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- CN112264931B CN112264931B CN202011142588.6A CN202011142588A CN112264931B CN 112264931 B CN112264931 B CN 112264931B CN 202011142588 A CN202011142588 A CN 202011142588A CN 112264931 B CN112264931 B CN 112264931B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
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Abstract
The invention relates to a polishing clamp for a self-adaptive type and size-variable test piece, and belongs to the field of test piece polishing for mechanical property testing. The clamp structure comprises a self-adaptive clamping system and a supporting system; the test piece is arranged above the supporting platform and clamped by the fan-shaped hoop, so that the parallelism and the verticality of the end surface are ensured; the fan-shaped hoop is locked annularly through the bolt, the screw rod is locked axially through the nut, and the three-dimensional freedom degree is fixed to avoid loosening; the pre-tightening spring drives the screw rod to move along the arc-shaped groove and the extension groove, so that the fan-shaped hoop is automatically centered and tightly held, and the variable test piece is self-adaptive to be clamped; the size of a clamping test piece is variable through the movement of the supporting platform and the fan-shaped hoop; the sector hoop and the plane patch or the right-angle patch are connected through the T-shaped groove to realize the variable type of the test piece; the fixture structure has the advantages of multiple functions and high precision, and not only can the self-adaptive type and size of a test piece be changed, but also loosening in the polishing process can be avoided, and the test piece can reach higher parallelism and verticality.
Description
Technical Field
The invention relates to a polishing clamp for a self-adaptive type and size-variable test piece, and belongs to the field of test piece polishing in a mechanical property test compression test.
Background
The compression test is a common material mechanical property testing technology, and is divided into a static compression test and a dynamic compression test; the two tests usually need to polish different types of test pieces, wherein the most common test technology in the dynamic compression test is Split Hopkinson Pressure Bar (SHPB) test technology, in order to reduce the influence of transverse inertia effect and dispersion effect and improve the accuracy of SHPB test data, a test piece with a smaller size is selected according to test requirements, and the test piece with a smaller size needs to be further polished after being machined to reach the surface roughness required by the test. The existing clamp structure often has several insufficiencies when polishing the test piece: when a test piece is clamped in a point contact or line contact mode, the surface of the test piece is easily damaged; the chuck shakes during polishing; the parallelism of the test piece and the perpendicularity of the surface and the central axis during polishing cannot be guaranteed; the automatic centering and the self-adaptive clamping of the test piece with variable type and size cannot be realized.
In chinese patent publication No. CN108161735A, fixing a variable diameter circular thin sheet specimen in the radial direction is achieved by moving a chuck pin in a chuck groove. However, the structure needs to adjust the position of the movable chuck through the socket head wrench from three directions, so that the clamping pins for clamping the test piece cannot move synchronously, center automatically and adapt to the change of the test piece. Due to the limitation of the height direction of the movable chuck and the bayonet lock, the thickness change of a test piece on the size is also limited, and the change of a round slice test piece can be realized only. Through this kind of three point ground centre gripping test piece of bayonet lock, can lead to the skew of in-process test piece surface of polishing, can't guarantee the depth of parallelism of test piece. The structure only plays a role in clamping the variable-diameter circular sheet; in chinese patent publication No. CN108326778A, automatic clamping of a variable bearing is achieved by a clamping jaw and an elastic return structure. However, the structure only utilizes the cambered surface of the clamping jaw to clamp the clamping jaw along the radial direction of the bearing, on one hand, the structure is not suitable for the polishing field, the end surface of the bearing is not supported, the required parallelism of two end surfaces cannot be realized, on the other hand, the structure cannot stably clamp a non-cylindrical test piece, and the type of the clamped test piece is limited; in chinese patent publication No. CN110814803A, a cylindrical hardware is clamped by two arc-shaped clamping plates and a rotating block. However, the structure needs to screw the rotating blocks at the two ends respectively, the two clamping mechanisms cannot synchronously move and attach to the outer wall of the hardware, and the structure is an auxiliary clamp for drilling the hardware, is only suitable for cylindrical hardware, is limited in the type of a clamped test piece, and is also not suitable for polishing the test piece because the parallelism of the two end surfaces of the clamped test piece cannot be guaranteed;
therefore, the invention designs the polishing clamp which has low cost, is convenient and flexible, reduces the damage of the test piece, avoids polishing and shaking, ensures the parallelism and the verticality of the end surface in the polishing process, is suitable for the cylindrical, square and slender test pieces with variable types and sizes, and can realize self-adaption, synchronous movement and automatic centering.
Disclosure of Invention
The invention aims to solve the problems that the surface of a clamped test piece is easily damaged, a chuck shakes and loosens in the polishing process, the parallelism of the test piece and the perpendicularity of a polishing surface and a central axis during polishing cannot be guaranteed, and the self-adaptive type and size variable test piece clamping cannot be realized in the conventional clamping device, and provides a polishing clamp for the self-adaptive type and size variable test piece.
The purpose of the invention is realized by the following technical scheme.
A grinding clamp of a self-adaptive type and size-variable test piece comprises a self-adaptive clamping system and a supporting system;
the adaptive clamping system comprises: the device comprises a cylinder base, a first sector hoop, a second sector hoop, a third sector hoop, a first screw, a second screw, a third screw, a pre-tightening spring, a plane patch and a right-angle patch; the top surface of the cylinder base is called a disc; a central threaded hole, an arc-shaped groove and an extension groove are distributed on the disc; the fan-shaped hoop is a structure with certain thickness and provided with hoop plates at two sides of a middle fan-shaped body; a key slot or a through hole for fixing a bolt is formed in a hoop plate of the fan-shaped hoop; the center of the fan-shaped hoop is provided with an internal thread which penetrates through the fan-shaped hoop along the axial direction of the fan-shaped hoop and is used for connecting a screw rod; t-shaped grooves are symmetrically formed in the inner wall of the sector hoop and used for connecting a plane patch or a right-angle patch; one end of the screw rod is connected with the driving fan-shaped hoop, and the other end of the screw rod penetrates through the arc-shaped groove or the extension groove, is connected with the pre-tightening spring and is fixedly locked through the nut;
the supporting system comprises a middle shaft screw rod, a supporting platform, a rotating handle and a fixed support spring; one end of the middle shaft screw rod penetrates through a central threaded hole in the disc to be connected with the supporting platform, and the other end of the middle shaft screw rod is connected with the rotating handle; the fixed support spring is sleeved outside the middle shaft screw rod between the supporting platform and the disc. The supporting platform is driven by a middle shaft lead screw to move along the axial direction of the supporting platform;
a test piece to be polished is arranged in an enclosed space formed by the three fan-shaped hoops above the supporting platform, and the supporting platform and the fan-shaped hoop with a certain thickness limit the three-dimensional freedom of the test piece together, so that the parallelism and the verticality of the test piece are ensured; the pre-tightening spring drives the screw rod to move along the arc-shaped groove and the extension groove, and the screw rod drives the fan-shaped hoop to realize pre-tightening, synchronous movement, automatic centering and self-adaptive clamping of the variable test piece; the size of the clamping test piece is variable through the movement of the supporting platform and the fan-shaped hoop; the sector hoop and the plane patch or the right-angle patch are connected through the T-shaped groove to realize the diversified and variable types of the clamping test piece; the fan-shaped hoop is locked along the annular direction through the bolt, the screw rod is locked along the axial direction through the nut, and the shaking is avoided along the bidirectional locking fixed position.
The number of the screw rods, the fan-shaped hoops and the pre-tightening springs is the same and is three;
the three fan-shaped hoops are driven by the screw rod to move in the arc-shaped groove or the extension groove respectively; the three fan-shaped hoops are sequentially and tightly connected end to end along the circumferential direction by bolts, a key groove is formed in the side hoop plate of the first fan-shaped hoop, and through holes are formed in the side hoop plates of the second fan-shaped hoop and the third fan-shaped hoop; when the screw rod moves in the extension groove, the bolt penetrates through the through hole or moves in the key groove in a matched mode to fasten the fan-shaped hoop, and the bolt is provided with a self-locking nut; further, where the longest extended slot has a centerline length S, the key slot length is at least:
the hoop plate of the second fan-shaped hoop, which is far away from the first fan-shaped hoop, is provided with an axial right-angle groove along the clamp structure; a radial right-angle groove along the clamp structure is formed in a hoop plate on one side, far away from the first fan-shaped hoop, of the third fan-shaped hoop;
the arc-shaped grooves are arc-shaped through grooves which are uniformly distributed at an angle of 120 degrees relative to the circle center of the disc; the central line of the arc-shaped groove is an arc line segment with the distance from the center of the circle increasing progressively and the curvature radius unchanged; corresponding points on the three center lines with the same distance to the circle center are always positioned at the vertexes of different equilateral triangles; the extension groove is a through groove extending outwards along the center line of the equilateral triangle at the outer side of the arc-shaped groove;
the pre-tightening springs are sequentially connected with the screw rods end to form an isosceles triangle; when the screw rod is closest to the circle center, namely the size of the test piece is the smallest, the pre-tightening spring is the shortest at the moment; when the screw rod moves outwards along the arc-shaped groove or the extension groove, the pre-tightening spring is stretched and provides pre-tightening force, and the fan-shaped hoop is automatically centered and moves synchronously at the moment to adapt to the change of the test piece;
the cylinder base can be used as a contact end for polishing of a handheld or polishing machine; the external thread of the middle shaft screw rod is an oblique square thread; the supporting platform is driven by the middle shaft screw rod to move up and down along the axial direction of the supporting platform, and the moving distance is the height variable range of the test piece. When the fixed support spring is the longest, the support platform is located at the highest position, and when the support platform moves along the axial direction, the fixed support spring provides reverse support acting force.
Further, an enclosed space in which the inner surface of the fan-shaped hoop or the inner surface of a complementary whole formed by the fan-shaped hoop, the plane patch and the right-angle patch is tangent to the test piece is an inner enclosed space; the three fan-shaped hoops respectively move to the positions farthest away from the circle center, and the size of the clamped test piece is the largest at the moment; the three fan-shaped hoops respectively move to the positions closest to the circle center, and the size of the clampable test piece is minimum; wherein the fan band inner diameter R2The maximum value of the radius of the inscribed circle of the inner space is obtained; when the sector hoops move to the nearest part away from the circle center, the three sector hoops are completely closed, the adjacent surfaces of the two hoop plates of the adjacent sector hoops are completely contacted, and the minimum radius of the inscribed circle of the inner space is R1(ii) a The included angle of the hoop plates on the two sides of the fan-shaped hoop is 120 degrees, and the inner diameter of the fan-shaped hoop is R2And the radian is theta, the radius R of the inscribed circle of the minimum inner surrounding space capable of clamping the test piece1Comprises the following steps:
further, aiming at the cylindrical test piece, the three screws respectively drive the fan-shaped hoops to synchronously and concentrically move along the arc-shaped grooves, the screws are always positioned at the vertexes of the equilateral triangle, the three fan-shaped hoops self-adaptively hold the test piece tightly, and the inner surfaces of the fan-shaped hoops are tangent to the cylindrical test piece;
further, for a square test piece, a plane patch is installed at the T-shaped groove of the first fan-shaped hoop; a right-angle patch can be arranged at the T-shaped groove of the second fan-shaped hoop; a right-angle patch can be arranged at the T-shaped groove of the third fan-shaped hoop; the fan-shaped hoop and the plane patch or the right-angle patch form a new complementary whole; the first screw drives the complementary whole formed by the first fan-shaped hoop and the plane patch to move along the arc-shaped groove; the second screw drives the second fan-shaped hoop or drives a complementary whole formed by the second fan-shaped hoop and the right-angle patch to move along the arc-shaped slot and the extension slot; the third screw drives the third fan-shaped hoop or drives a complementary whole formed by the third fan-shaped hoop and the right-angle patch to move along the arc-shaped groove and the extension groove; namely, when a square test piece is clamped, the second fan-shaped hoop and the third fan-shaped hoop can be provided with right-angle patches or without the right-angle patches; the three screws are always positioned at the vertexes of the isosceles triangles and move synchronously, so that one-side double-edge type or one-side double-angle type clamping of the square test piece is realized;
further, for the slender test piece, the fan-shaped hoops can also clamp the slender rod or beam along the radial direction or the axial direction of the clamp structure; when the test piece is clamped along the radial direction of the clamp structure, the axial direction of the slender test piece is consistent with the radial direction of the clamp structure; the inner surface of the first fan-shaped hoop, the inner surface of the hoop plate at one side of the second fan-shaped hoop with the right-angle groove and the inner surface of the hoop plate at one side of the third fan-shaped hoop with the right-angle groove clamp a test piece together, wherein the radial right-angle groove of the third fan-shaped hoop can be matched with and clamp the elongated rod, and the length of the test piece is not limited; when the test piece is clamped along the axial direction of the clamp structure, the axial direction of the slender test piece is consistent with the axial direction of the clamp structure; the inner surface of the hoop plate at one side of the right-angle groove of the second fan-shaped hoop and the inner surface of the hoop plate at one side of the right-angle groove of the third fan-shaped hoop jointly clamp the test piece, wherein the axial right-angle groove of the second fan-shaped hoop can be matched with and clamp the elongated rod; the length of the hoop plate of the fan-shaped hoop from the circle center of the disc is larger than the radius of the cylinder base, the clamp structure is placed on the boundary of the workbench or a fixed grinding machine, the test piece can be suspended and does not contact with the cylinder base, and the length of the test piece to be ground is not limited.
Compared with the prior art, the polishing clamp for the self-adaptive type and size-variable test piece provided by the invention has the following beneficial effects that:
1. according to the polishing clamp for the self-adaptive type and size-variable test piece, linear motion is converted according to rotation of the middle shaft lead screw, the supporting platform is driven to move along the axial direction of the supporting platform, a reverse acting force is provided by combining the fixed support spring, and the thickness of the test piece arranged on the supporting platform is variable; the screw rod is connected with the fan-shaped hoop through threads and moves along the arc-shaped groove and the extension groove, and the size of an inner space formed by the fan-shaped hoop is changeable; therefore, the clamping of the test piece with variable size is realized through the movement of the supporting platform and the fan-shaped hoop;
2. according to the polishing clamp for the self-adaptive type and size-variable test piece, the cylindrical test piece is clamped through the three fan-shaped hoops; the fan-shaped hoop and the plane patch or the right-angle patch are connected through the T-shaped groove, the inner surface of the fan-shaped hoop is filled, and the clamping of one side of the square test piece in a two-edge mode or one side in a two-angle mode is realized; clamping the slender test piece through the fan-shaped hoop and the lateral hoop plate of the fan-shaped hoop; thereby realizing clamping of the test piece with variable types;
3. according to the polishing clamp for the self-adaptive type and size-variable test piece, the bottom ends of the three screw rods are sequentially connected through the pre-tightening springs, the screw rod is closest to the circle center of the disc at the initial moment, the pre-tightening spring is in a pre-tightening state at the shortest time, the test piece is placed and then extrudes the fan-shaped hoop outwards along the radial direction, the spring is pulled at the moment to provide reverse pre-tightening force, so that the screw rod drives the fan-shaped hoop to move inwards along the radial direction synchronously, and the fan-shaped hoop automatically centers and holds the test piece tightly; the pre-tightening force provided by the end-to-end connection of the three springs is utilized to realize synchronous movement, automatic centering, pre-tightening and clamping of self-adaptive test piece change;
4. according to the polishing clamp for the self-adaptive type and size variable test piece, when the test piece to be polished is arranged above the supporting platform and in the surrounding space formed by the three fan-shaped hoops, the supporting platform is axially pressed, the fixed support spring provides reverse supporting force for the supporting platform, and the screw thread of the central shaft screw connected with the supporting platform adopts the inclined square screw thread to prevent the supporting platform from moving; the fan-shaped hoops are sequentially and tightly connected end to end in an annular direction by bolts, wherein the bolts penetrate through the through holes or the key grooves to be matched with the self-locking nuts to tightly press the hoop plates of the fan-shaped hoops along the normal direction, and then the screws are locked axially by the nuts; the radial, annular and axial three-way freedom degrees of the test piece are fixed to avoid loosening in the polishing process;
5. according to the polishing clamp for the self-adaptive test piece with the variable type and size, the axial directions of the supporting platform and the fan-shaped hoop are consistent, the upper surface of the fan-shaped hoop and the supporting platform meet high-precision parallelism, and the parallelism and the perpendicularity of the test piece to be polished are guaranteed by utilizing the supporting platform and the fan-shaped hoop with a certain thickness through bidirectional common clamping.
Drawings
FIG. 1 is an isometric partial cross-sectional view of a lapping fixture for an adaptive type and size variable test piece according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a grinding fixture for a self-adaptive test piece with a variable size according to an embodiment of the present invention, for a cylindrical test piece; wherein fig. 2(a) is a schematic view of a fixture structure for a cylindrical test piece without a test piece placed therein; FIG. 2(b) is a schematic diagram of a cylindrical test piece with a fixture structure;
FIG. 3 is a schematic structural diagram of a square test piece of the polishing clamp for the self-adaptive test piece with variable size according to the embodiment of the invention; FIG. 3(a) is a back view of a square test piece with a plane patch added to the clamp structure without the test piece; FIG. 3(b) is a schematic diagram of a square test piece with a clamp structure after a plane patch is added; FIG. 3(c) is a top view of a square test piece with plane patches and right-angle patches added to the clamp structure without the test piece; FIG. 3(d) is a schematic diagram of a square test piece with a plane patch and a right-angle patch added to the clamp structure;
FIG. 4 is a schematic structural diagram of a grinding fixture for a self-adaptive test piece with a variable size according to an embodiment of the present invention, for a slender test piece; FIG. 4(a) is a schematic diagram of a clamp structure for a slender test piece clamping the test piece along the radial direction thereof; FIG. 4(b) is a schematic diagram of a clamp structure for a slender specimen to clamp the specimen in its axial direction;
FIG. 5 is a bottom view of a grinding fixture for an adaptive type and size variable test piece according to an embodiment of the present invention;
FIG. 6 is a top view of a top disk of a cylindrical base having distributed central threaded holes, arcuate slots, and extension slots in accordance with an embodiment of the present invention;
FIG. 7 is a dimensional representation of some of the components described in the embodiments of the present invention;
in the figure, 1-cylinder base; 2, a disc; 3-arc groove; 4-an extension groove; 5-a first fan-shaped hoop; 6-a second sector hoop; 7-a third sector hoop; 8-a first screw; 9-a second screw; 10-a third screw; 11-pre-tightening the spring; 12-a nut; 13-bolt; 14-self-locking nut; 15-middle shaft screw rod; 16-a support platform; 17-a rotating handle; 18-a fixed support spring; 19-plane patch; 20-right-angle patch; 21-a T-shaped groove; 22-right angle groove; 23-a keyway; 24-cylindrical test piece; 25-square test piece; 26-slender specimen.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
A grinding clamp of a self-adaptive type and size-variable test piece comprises a self-adaptive clamping system and a supporting system, wherein the self-adaptive clamping system comprises:
as shown in fig. 1 to 6, the adaptive clamping system includes: the device comprises a cylinder base 1, a first fan-shaped hoop 5, a second fan-shaped hoop 6, a third fan-shaped hoop 7, a first screw 8, a second screw 9, a third screw 10, a pre-tightening spring 11, a plane patch 19 and a right-angle patch 20; the top surface of the cylindrical base 1 is called a disc 2; a central threaded hole, an arc-shaped groove 3 and an extension groove 4 are distributed on the disc 2; the fan-shaped hoop is a structure with certain thickness and provided with hoop plates at two sides of a middle fan-shaped body; a key slot 23 or a through hole for fixing the bolt 13 is formed in the hoop plate of the fan-shaped hoop; the center of the fan-shaped hoop is provided with an internal thread which penetrates through the fan-shaped hoop along the axial direction of the fan-shaped hoop and is used for connecting a screw rod; symmetrical T-shaped grooves 21 are formed in the inner wall of a sector of the sector hoop and used for connecting the plane patch 19 or the right-angle patch 20; one end of the screw rod is connected with the driving fan-shaped hoop, and the other end of the screw rod penetrates through the arc-shaped groove 3 or the extension groove 4, is connected with the pre-tightening spring 11, and is fixedly locked through the nut 12;
as shown in fig. 1 to 6, the support system includes a central shaft screw 15, a support platform 16, a rotary handle 17 and a fixed support spring 18; one end of the middle shaft screw rod 15 penetrates through a central threaded hole in the disc 2 to be connected with the supporting platform 16, and the other end of the middle shaft screw rod is connected with the rotating handle 17; the fixed support spring 18 is sleeved outside the middle shaft screw rod 15 between the supporting platform 16 and the disc; the supporting platform 16 is driven by the central shaft screw 15 to move along the axial direction.
As shown in fig. 2(a) and 5, the three fan-shaped hoops are respectively driven by the screw rod to move in the arc-shaped groove 3 or the extension groove 4; the three fan-shaped hoops are sequentially and fixedly connected end to end along the annular direction by bolts 13; a key groove 23 is formed in the side hoop plate of the first fan-shaped hoop 5, and through holes are formed in the side hoop plates of the second fan-shaped hoop 6 and the third fan-shaped hoop 7; when the screw moves in the extension slot 4, the bolt 13, which bolt 13 is provided with a self-locking nut 14, passes through the through hole or moves in cooperation with it in the keyway 23 to fasten the fan band.
As shown in fig. 5, the pre-tightening springs 11 are sequentially connected with the screws end to form an isosceles triangle; when the screw rod is closest to the circle center, namely the size of the clamped test piece is the smallest, the pre-tightening spring 11 is the shortest at the moment; when the screw rod moves outwards along the arc-shaped groove 3 or the extension groove 4, the pre-tightening spring 11 is stretched and provides pre-tightening force, and at the moment, the fan-shaped hoop is automatically centered and moves synchronously to adapt to the change of a test piece;
as shown in fig. 6, the arc-shaped slots 3 are arc-shaped through slots uniformly distributed at 120 ° intervals relative to the center of the disc; the central line of the arc-shaped groove 3 is an arc line segment with the distance from the center of the circle increasing progressively and the curvature radius unchanged; corresponding points on the three center lines with the same distance to the circle center are always positioned at the vertexes of different equilateral triangles; the extension groove 4 is a through groove extending outwards along the central line of the equilateral triangle at the outer side of the arc-shaped groove 3.
In this embodiment, as shown in fig. 7, the screw is axially aligned with the fan-shaped hoop, and the screw is located in the fan-shaped hoopThe center of the hoop, the upper end surface of the screw and the upper surface center of the fan-shaped hoop are coincided, and the radius of the screw is R3In order to avoid tearing caused by stress concentration, the radial distance u between the centroid of the upper end surface of the screw and the boundary of the outer wall or the inner wall of the fan-shaped hoop is more than or equal to 4R3In this embodiment, u is 4R3The wall thickness of the fan-shaped hoop is U-8R3The width of the arc-shaped groove 3 and the extension groove 4 is equal to the diameter 2R of the screw rod3The distance between the two ends of the central line of the arc-shaped groove 3 and the circle center of the disc 2 is X respectivelymin＝R1+4R3，Xmax＝R2+4R3(ii) a The longest extension slot 4 has a centerline length S, and the key slot 23 has a length of at least
Longest length of pre-tensioned spring 11
In this embodiment, as shown in fig. 7, the inner diameter R of the sector hoop2The maximum value of the radius of the inscribed circle of the inner space is obtained; when the sector hoops move to the nearest part away from the circle center, the three sector hoops are completely closed, the adjacent surfaces of the two hoop plates of the adjacent sector hoops are completely contacted, and the radius R of the inscribed circle of the inner space is equal to the radius R1Minimum; the included angle of the hoop plates on the two sides of the fan-shaped hoop is 120 degrees, and the inner diameter of the fan-shaped hoop is R2And the radian is theta, the radius R of the inscribed circle of the minimum inner surrounding space capable of clamping the test piece1Comprises the following steps:
in conclusion, the radius range R of the cylindrical test piece 24 can be clamped1≤R≤R2；
In this embodiment, as shown in fig. 7, the positions and the number of the extension slots 4 can be designed as required, and here, the longest extension slot 4 is considered to be located on the extension line of the connection line between the farthest end of the arc-shaped slot 3 from the center of the circle of the disc 2 and the center of the circle; the three threaded rods move in the arc-shaped groove 3 or the extension groove 4, so that the threaded rods are always positionedThe center line of the equilateral triangle or the extension line of the center line; in the embodiment, three points of a right-angle origin point of the upper surface of the right-angle patch 20, the circle center of the disc 2 and the center of the screw are collinear and are all on the central line or the extension line of the equilateral triangle line; since the planar patch 19 is completely complementary to the fan-shaped hoop, the outer diameter of the planar patch 19 is equal to the inner diameter of the fan-shaped body of the fan-shaped hoop, and the outer diameter is R2And the radian is the same as theta, the upper surface arch rise of the plane patch 19, namely the central thickness of the plane patch 19 is as follows:
the width of the chord length and plane patch 19 is
As shown in fig. 3(c), the right-angle patch 20 of the second fan-shaped hoop 6 and the right-angle patch 20 of the third fan-shaped hoop 7 are symmetrical to each other and form a square inner space with the plane patch 19, and since the included angle between the two side hoop plates of the fan-shaped hoop is 120 °, if the right-angle side length of the bow string of the right-angle patch 20, which is perpendicular to the plane patch 19, is d, the right-angle side length of the bow string parallel to the plane patch 19 is d
The first fan-shaped hoop 5 is combined with a plane patch 19, the second fan-shaped hoop 6 or the second fan-shaped hoop 6 is combined with a right-angle patch 20, the third fan-shaped hoop 7 or the third fan-shaped hoop 7 is combined with the right-angle patch 20, and a square test piece 25 is placed in an inner space formed by the two modes; when the supporting platform 16 is located in the inner space of the complementary whole formed by the fan-shaped hoop and the patch when supporting the test piece, the radius of the supporting platform 16 is
In summary, the size of the clampable square test piece 25 is longest:
the maximum size of the clampable square test piece 25 is:
the height of the fan-shaped hoop is h1The center height of the through hole for communicating the bolt 13 with the key groove 23 is
The radius of the through hole and the bolt 13 and the width of the key groove 23 are R5The support platform 16 has a thickness h2The shortest length of the fixed support spring 18 is set as h3The thickness variable range of the cylindrical test piece 24 and the square test piece 25 is more than or equal to 0 and less than or equal to h1-h2-h5(ii) a In the same way, in order to avoid the influence of stress concentration, the distance between the boundary of the cylinder base 1 and the center of the endpoint of the extension groove 4 is more than or equal to 4R3And the distance from the central point of the through hole on the hoop plate of the fan-shaped hoop to the adjacent endpoint of the inner wall of the fan-shaped hoop is y, and the radius range of the cylinder base 1 is as follows:
in summary, the grippable elongated test piece 26 has the widest dimension
The thickest size of the grippable elongated test piece 26 may be
Since the elongated specimen 26 can be ground in the transverse or longitudinal direction, the length of the specimen is not limited;
when the polishing device is used for polishing a test piece of a mechanical property test, the type of the polished test piece and the use of a clamp are required to be adjusted according to the type of the test; the embodiment is suitable for a static compression test and a dynamic compression SHPB test in a mechanical property test.
When the test piece of the invention used for static compression test or dynamic SHPB compression test of mechanical properties is polished, the cylinder base 1 can be used as a contact end of a hand-held or polishing machine.
When the test piece used for the compression test of the mechanical property test is polished, the three screws are closest to the circle center of the disc 2 at the initial moment, namely the three screws are respectively positioned at the end points of the arc-shaped groove 3 closest to the circle center, the fan-shaped hoop connected with one end of the screw is also closest to the circle center at the moment, the size of an inner enclosure space formed by the three fan-shaped hoops is minimum, and the radius of the inner enclosure space is R1The three pre-tightening springs 11 at the other end of the connecting screw rod are shortest to form an isosceles triangle and are in a pre-tightening state;
firstly, the position of the supporting platform 16 is required to be adjusted according to the height of the test piece; the middle shaft screw rod 15 is rotated through the rotating handle 17, the middle shaft screw rod 15 passes through the central threaded hole, and the rotary motion is converted into linear motion through threads, so that the supporting platform 16 is driven to uniformly move along the axial direction of the supporting platform; the test piece is placed on the supporting platform 16, when the surface to be polished of the test piece and the upper surfaces of the three fan-shaped hoops with certain thicknesses are on the same horizontal plane, the rotation of the rotating handle 17 is stopped, and at the moment, the height of the supporting platform 16 is fixed.
When the invention is used for a dynamic compression SHPB test, a cylindrical test piece 24 is polished according to the test requirement, as shown in figure 2, the radius of an inscribed circle of an inner space formed by three fan-shaped hoops at an initial position is R1The size of the clamped test piece is minimum, and when the cylindrical test piece 24 is placed, the radius R of the test piece is more than or equal to R1The test piece extrudes the fan-shaped hoop outwards along the radial direction, the fan-shaped hoop is forced to drive the screw rods connected through the threads to move outwards along the arc-shaped groove 3 from the initial position, at the moment, the pre-tightening springs 11 connected with the screw rods are stretched, radially inwards pre-tightening reaction force is provided for the screw rods, and the three screw rods drive the fan-shaped hoop to synchronously move and automatically center in the arc-shaped groove 3; when the three fan-shaped hoops are adaptive to the size change of the cylindrical test piece 24 and tangent to the outer surface of the cylindrical test piece 24 placed on the supporting platform 16, the three fan-shaped hoops are sequentially fastened end to end in the circumferential direction through bolts 13, and then the screws are locked in the axial direction through nuts 12, so that the test piece is fixed in the fan-shaped hoops on the supporting platform 16;
when the invention is used for a dynamic compression SHPB test, a bullet is polished according to the test requirement, the bullet is usually a slender test piece 26 comprising a rod or a beam, as shown in FIG. 4, because the inner space formed by three fan-shaped hoops at the initial position is the minimum, the gap between the side hoop plates of the adjacent fan-shaped hoops is also the minimum; when the slender test piece 26 is placed, the fan-shaped hoop is extruded by the test piece, so that the screw rod is driven to move outwards from the initial position along the arc-shaped groove 3 or the extension groove 4, and the pre-tightening spring 11 connected with the screw rod is stretched at the moment to provide a radially inwards pre-tightening reaction force for the screw rod; due to the pretightening force of the spring, when the test piece is clamped along the radial direction of the clamp structure, the axial direction of the test piece is consistent with the radial direction of the clamp structure; the inner surface of the first fan-shaped hoop 5, the inner surface of the hoop plate on the side with the right-angle groove 22 of the second fan-shaped hoop 6 and the inner surface of the hoop plate on the side with the right-angle groove 22 of the third fan-shaped hoop 7 are adaptive to clamp a test piece together, wherein the radial right-angle groove of the third fan-shaped hoop 7 can be matched with and clamp the elongated rod 26, and the length of the test piece is not limited; when the test piece is clamped along the axial direction of the clamp structure, the axial direction of the test piece is consistent with the radial direction of the clamp structure; the inner surface of the hoop plate at one side with the right-angle groove 22 of the second fan-shaped hoop 6 and the inner surface of the hoop plate at one side with the right-angle groove 22 of the third fan-shaped hoop 7 are adaptive to clamp a test piece together, wherein the axial right-angle groove 22 of the second fan-shaped hoop 6 can be matched with and clamp an elongated rod; the hoop plate of the fan-shaped hoop extends out of the cylinder base 1, so that the length of the test piece is not limited when the test piece is clamped in the axial direction;
when the invention is used for a static compression test, a square test piece 25 is polished according to the test requirement, and as shown in fig. 3, a plane patch 19 is arranged at the T-shaped groove 21 of the first fan-shaped hoop 5; a right-angle patch 20 can be arranged at the T-shaped groove 21 of the second fan-shaped hoop 6; a right-angle patch 20 can be arranged at the T-shaped groove 21 of the third fan-shaped hoop 7; namely, when the square test piece 25 is clamped, the right-angle patch 20 can be installed on the second fan-shaped hoop 6 and the third fan-shaped hoop 7 or the right-angle patch 20 is not installed; the fan-shaped hoop and the plane patch 19 or the right-angle patch 20 form a new complementary whole; because the inner space formed by the three fan-shaped hoops at the initial position is the minimum, when a square test piece 25 is placed, the fan-shaped hoops or the complementary whole formed by the fan-shaped hoops and the patch is extruded by the test piece, so that the screw rod is driven to move outwards from the initial position along the arc-shaped groove 3 or the extension groove 4, and the pre-tightening spring 11 connected with the screw rod is stretched at the moment to provide a pre-tightening reaction force inwards along the radial direction for the screw rod; under the action of the pre-tightening force of the spring, the first screw 8 drives the complementary whole formed by the first sector hoop 5 and the plane patch 19 to move along the arc-shaped groove 3; the second screw 9 drives the second fan-shaped hoop 6 or drives a complementary whole formed by the second fan-shaped hoop 6 and the right-angle patch 20 to move along the arc-shaped slot 3 and the extension slot 4; the third screw 10 drives the third fan-shaped hoop 7 or drives the complementary whole formed by the third fan-shaped hoop 7 and the right-angle patch 20 to move along the arc-shaped groove 3 and the extension groove 4; the three screws are always positioned at the vertex of the isosceles triangle and move synchronously, the sector hoop or the complementary whole formed by the sector hoop and the patch block is adaptive to the size change of the square test piece 25, and one side of the square test piece 25 is clamped in a two-edge mode or a two-angle mode; similarly, the three fan-shaped hoops are sequentially fastened end to end in the circumferential direction through bolts 13, and the screw is locked through nuts 12, so that the test piece is fixed;
according to the embodiment, the grinding clamp for the self-adaptive type and size-variable test piece at least has the following beneficial effects:
(1) according to the polishing clamp for the self-adaptive type and size-variable test piece, linear motion is converted according to rotation of the middle shaft lead screw, the supporting platform is driven to move along the axial direction of the supporting platform, a reverse acting force is provided by combining the fixed support spring, and the thickness of the test piece arranged on the supporting platform is variable; the screw rod is connected with the fan-shaped hoop through threads and moves along the arc-shaped groove and the extension groove, and the size of an inner space formed by the fan-shaped hoop is changeable; therefore, the clamping of the test piece with variable size is realized through the movement of the supporting platform and the fan-shaped hoop.
(2) According to the polishing clamp for the self-adaptive type and size-variable test piece, the cylindrical test piece is clamped through the three fan-shaped hoops; the fan-shaped hoop and the plane patch or the right-angle patch are connected through the T-shaped groove, the inner surface of the fan-shaped hoop is filled, and the clamping of one side of the square test piece in a two-edge mode or one side in a two-angle mode is realized; clamping the slender test piece through the fan-shaped hoop and the lateral hoop plate of the fan-shaped hoop; thereby realizing clamping of the test piece with variable types.
(3) According to the polishing clamp for the self-adaptive type and size-variable test piece, the bottom ends of the three screw rods are sequentially connected through the pre-tightening springs, the screw rod is closest to the circle center of the disc at the initial moment, the pre-tightening spring is in a pre-tightening state at the shortest time, the test piece is placed and then extrudes the fan-shaped hoop outwards along the radial direction, the spring is pulled at the moment to provide reverse pre-tightening force, so that the screw rod drives the fan-shaped hoop to retract inwards along the radial direction, and the fan-shaped hoop is automatically centered and moves synchronously; the pretightening force provided by the three springs in end-to-end connection is utilized to realize automatic centering, pretightening and self-adaptive test piece change clamping.
(4) According to the polishing clamp for the self-adaptive type and size variable test piece, when the test piece to be polished is arranged above the supporting platform and in the surrounding space formed by the three fan-shaped hoops, the supporting platform is axially pressed, the fixed support spring provides reverse supporting force for the supporting platform, and the screw thread of the central shaft screw connected with the supporting platform adopts the inclined square screw thread to prevent the supporting platform from moving; the fan-shaped hoops are sequentially and tightly connected end to end in an annular direction by bolts, wherein the bolts penetrate through the through holes or the key grooves to be matched with the self-locking nuts to tightly press the hoop plates of the fan-shaped hoops along the normal direction, and then the screws are locked axially by the nuts; the radial, circumferential and axial three-way freedom degrees of the fixed test piece avoid loosening in the polishing process.
(5) According to the polishing clamp for the self-adaptive test piece with the variable type and size, the axial directions of the supporting platform and the fan-shaped hoop are consistent, the upper surface of the fan-shaped hoop and the supporting platform meet high-precision parallelism, and the parallelism and the perpendicularity of the test piece to be polished are guaranteed by utilizing the supporting platform and the fan-shaped hoop with a certain thickness through bidirectional common clamping.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a grinding fixture of variable test piece of self-adaptation type and size which characterized in that: the device comprises an adaptive clamping system and a supporting system;
the adaptive clamping system comprises: the device comprises a cylinder base (1), a first fan-shaped hoop (5), a second fan-shaped hoop (6), a third fan-shaped hoop (7), a first screw (8), a second screw (9), a third screw (10), a pre-tightening spring (11), a plane patch (19) and a right-angle patch (20); the top surface of the cylinder base (1) is called a disc (2); a central threaded hole, an arc-shaped groove (3) and an extension groove (4) are distributed on the disc (2); the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7) are structures with certain thickness, wherein hoop plates are arranged on two sides of a middle fan-shaped body; key grooves (23) or through holes for fixing bolts (13) are formed in hoop plates of the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7); the centers of the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7) are provided with internal threads which penetrate along the axial direction of the first fan-shaped hoop, the second fan-shaped hoop and the third fan-shaped hoop and are used for connecting a screw rod; symmetrical T-shaped grooves (21) are formed in the inner walls of the sectors of the first sector hoop (5), the second sector hoop (6) and the third sector hoop (7) and are used for connecting a plane patch (19) or a right-angle patch (20); one end of the screw rod is connected with the driving fan-shaped hoop, and the other end of the screw rod penetrates through the arc-shaped groove (3) or the extension groove (4), is connected with the pre-tightening spring (11), and is fixedly locked through the nut (12);
the supporting system comprises a middle shaft screw rod (15), a supporting platform (16), a rotating handle (17) and a fixed support spring (18); one end of the middle shaft screw rod (15) penetrates through a central threaded hole in the disc (2) to be connected with the supporting platform (16), and the other end of the middle shaft screw rod is connected with the rotating handle (17); the fixed support spring (18) is sleeved outside a middle shaft screw rod (15) between the supporting platform (16) and the disc (2); the supporting platform (16) is driven by a middle shaft screw rod (15) to move along the axial direction of the supporting platform;
a test piece to be polished is arranged in an enclosed space formed by the three fan-shaped hoops above the supporting platform (16), and the supporting platform (16) and the fan-shaped hoops with certain thickness jointly limit the three-dimensional freedom of the test piece, so that the parallelism and the perpendicularity of the test piece are ensured; the pre-tightening spring (11) drives the screw rod to move along the arc-shaped groove (3) and the extension groove (4), and the screw rod drives the fan-shaped hoop to move synchronously, automatically center and self-adaptively clamp the variable test piece due to the pre-tightening force of the spring; the size of the clamping test piece is variable through the movement of the supporting platform (16) and the fan-shaped hoop; the sector hoop and the plane patch (19) or the right-angle patch (20) are connected through the T-shaped groove (21) to realize the diversified and variable types of the clamped test piece; the fan-shaped hoop is locked along the annular direction through the bolt (13), the screw rod is locked along the axial direction through the nut (12), and looseness is avoided along the bidirectional locking fixed position.
2. A grinding jig for a test piece as defined in claim 1, wherein: the screw rods, the three fan-shaped hoops and the pre-tightening springs are the same in number and are all three.
3. A grinding jig for a test piece as defined in claim 1, wherein: the three fan-shaped hoops are driven by the screw rod to move in the arc-shaped groove (3) or the extension groove (4) respectively; the three fan-shaped hoops are sequentially and fixedly connected end to end along the annular direction by bolts (13); a key groove (23) is formed in a side hoop plate of the first fan-shaped hoop (5), and through holes are formed in side hoop plates of the second fan-shaped hoop (6) and the third fan-shaped hoop (7); when the screw rod moves in the extension groove (4), the bolt (13) passes through the through hole or cooperatively moves in the key groove (23) to fasten the fan-shaped hoop, wherein the bolt (13) is provided with a self-locking nut (14).
4. A grinding jig for a test piece as defined in claim 1 or 3, wherein: a right-angle groove (22) along the axial direction of the clamp structure is formed in a hoop plate on one side, far away from the first fan-shaped hoop (5), of the second fan-shaped hoop (6); a right-angle groove (22) along the radial direction of the clamp structure is formed in a hoop plate on one side, far away from the first fan-shaped hoop (5), of the third fan-shaped hoop (7);
the arc-shaped grooves (3) are arc-shaped through grooves which are uniformly distributed at an angle of 120 degrees relative to the circle center of the disc; the central line of the arc-shaped groove (3) is an arc line segment with the distance from the center of the circle increasing progressively and the curvature radius unchanged; corresponding points on the three center lines with the same distance to the circle center are always positioned at the vertexes of different equilateral triangles;
the extension groove (4) is a through groove extending outwards along the central line of the equilateral triangle at the outer side of the arc-shaped groove (3).
5. A grinding jig for a test piece as defined in claim 1, wherein: the pre-tightening springs (11) are sequentially connected with the screw rods end to form an isosceles triangle; when the screw rod is closest to the circle center, namely the size of the clamped test piece is the smallest, the pre-tightening spring (11) is the shortest at the moment; when the screw rod moves outwards along the arc-shaped groove (3) or the extension groove (4), the pre-tightening spring (11) is stretched and provides pre-tightening force, and at the moment, the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7) are automatically centered and move synchronously to adapt to the change of a test piece;
the external thread of the middle shaft screw rod (15) is an oblique square thread;
the supporting platform (16) is driven by a middle shaft screw rod (15) to move up and down along the axial direction of the supporting platform, and the moving distance is the height variable range of the test piece;
when the fixed supporting spring (18) is the longest, the supporting platform (16) is located at the highest position along the axial direction, the upper surface of the supporting platform (16) is coplanar with the upper surface of the fan-shaped hoop, and when a test piece is placed on the supporting platform (16) and the supporting platform (16) is pressed along the axial direction, the fixed supporting spring (18) provides reverse supporting force.
6. A grinding jig for a test piece as defined in claim 1, wherein: the inner surfaces of the first fan-shaped hoop (5), the second fan-shaped hoop (6), the third fan-shaped hoop (7) or the first fan-shaped hoop (5)) and the plane patch (19) form a complementary integral, and the inner surfaces of the second fan-shaped hoop (6) and the third fan-shaped hoop (7) or the inner surface of the first fan-shaped hoop (5) and the plane patch (19) form a complementary integral, and the tangential enclosed space of the second fan-shaped hoop (6), the third fan-shaped hoop (7) and the 2 right-angle patches (20) form a complementary integral and the test piece is an inner enclosed space; the three fan-shaped hoops respectively move to the positions farthest away from the circle center, and the size of the clamped test piece is the largest at the moment; the three fan-shaped hoops respectively move to the positions closest to the circle center, and the size of the clamped test piece is the minimum.
7. A grinding jig for a test piece as defined in claim 1 or 6, wherein: aiming at a cylindrical test piece (24), the three screw rods respectively drive the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7) to synchronously move along the arc-shaped groove (3) under the action of a pre-tightening spring (11), the three fan-shaped hoops self-adaptively clasp the test piece, the inner surface of each fan-shaped hoop is tangent to the cylindrical test piece (24), and the screw rods are always positioned at the vertexes of an equilateral triangle under the action of the pre-tightening spring;
for a square test piece (25), a plane patch (19) is arranged at the T-shaped groove (21) of the first fan-shaped hoop (5); a right-angle patch (20) can be arranged at the T-shaped groove (21) of the second fan-shaped hoop (6); a right-angle patch (20) can be arranged at the T-shaped groove (21) of the third fan-shaped hoop (7); the first fan-shaped hoop (5) and a plane patch (19) or the second fan-shaped hoop (6) and the third fan-shaped hoop (7) and a right-angle patch (20) form a new complementary whole; the first screw (8) drives the complementary whole formed by the first fan-shaped hoop (5) and the plane patch (19) to move along the arc-shaped groove (3); the second screw (9) drives the second fan-shaped hoop (6) or drives a complementary whole formed by the second fan-shaped hoop (6) and the right-angle patch (20) to move along the arc-shaped groove (3) and the extension groove (4); the third screw (10) drives the third fan-shaped hoop (7) or drives a complementary whole formed by the third fan-shaped hoop (7) and the right-angle patch (20) to move along the arc-shaped groove (3) and the extension groove (4); namely, when a square test piece (25) is clamped, the second fan-shaped hoop (6) and the third fan-shaped hoop (7) can be provided with the right-angle patch (20) or not provided with the right-angle patch (20); the three screw rods are always positioned at the vertexes of the isosceles triangles and move synchronously; one-side two-edge type or one-side two-angle type clamping of the square test piece (25) is realized;
for the slender test piece (26), the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7) can also clamp a slender rod or beam along the radial direction or the axial direction of the clamp structure; when a test piece is clamped along the radial direction of the clamp structure, the axial direction of the elongated test piece (26) is consistent with the radial direction of the clamp structure, the inner surface of the first fan-shaped hoop (5), the inner surface of the hoop plate on the side, provided with the right-angle groove (22), of the second fan-shaped hoop (6) and the inner surface of the hoop plate on the side, provided with the right-angle groove (22), of the third fan-shaped hoop (7) jointly clamp the test piece, and the radial right-angle groove (22) of the third fan-shaped hoop (7) can be matched with and clamp the elongated rod; the length of the test piece is not limited; when the test piece is clamped along the axial direction of the clamp structure, the axial direction of the slender test piece (26) is consistent with the axial direction of the clamp structure; the inner surface of the hoop plate at one side of the second fan-shaped hoop (6) with the right-angle groove (22) and the inner surface of the hoop plate at one side of the third fan-shaped hoop (7) with the right-angle groove (22) clamp a test piece together, wherein the axial right-angle groove (22) of the second fan-shaped hoop (6) can be matched with and used for clamping an elongated rod; the most distal end of the hoop plate of the fan-shaped hoop is longer than the radius of the cylinder base (1) from the circle center of the disc (2), when the cylinder base (1) is used as a handheld or grinding machine contact end, the clamp structure is placed on the boundary of a workbench or a fixed grinding machine, a test piece is suspended and does not contact the cylinder base (1), and the length of the test piece to be ground is not limited.
8. A grinding jig for a test piece as defined in any one of claims 1, 2, 3, 5 or 6, wherein: wherein the inner diameter R of the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7)2The maximum value of the radius of the inscribed circle of the inner space is obtained; when the sector hoops move to the nearest part away from the circle center, the three sector hoops are completely closed, the adjacent surfaces of the two hoop plates of the adjacent sector hoops are completely contacted, and the radius of an inscribed circle of the inner space is R at the minimum1(ii) a The included angle of the hoop plates on the two sides of the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7) is 120 degrees, and the inner diameters of the first fan-shaped hoop (5), the second fan-shaped hoop (6) and the third fan-shaped hoop (7) are set to be R2And the radian is theta, the radius R of the inscribed circle of the minimum inner surrounding space capable of clamping the test piece1Comprises the following steps:
the length of the center line of the longest extending groove (4) is S, the length of the key groove (23) is at least
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| CN114636906B (en) * | 2022-03-31 | 2023-10-13 | 中节能启源雷宇（江苏）电气科技有限公司 | Test piece testing arrangement of high voltage test |
| CN115932220B (en) * | 2023-03-14 | 2023-06-16 | 沧州市振平绿化有限责任公司 | Measuring device suitable for agriculture and forestry carbon sink detects and uses |
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| CN112264931A (en) | 2021-01-26 |
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