Positioning clamp suitable for contourgraph measurement

Abstract

The utility model relates to a positioning fixture, in particular to a positioning fixture suitable for contourgraph measurement, and solves the problems that the conventional positioning fixture can only complete prone position or vertical position measurement of a retarder shell cover of one model after being assembled each time, and after the measurement is completed, the positioning fixture needs to be reassembled, and then another position is positioned and measured. And the problems of complicated disassembly and assembly, low detection efficiency and influence on measurement precision are solved. The fixture comprises a fixture body, a limiting rod and a clamping bolt, wherein a reference counter bore in the fixture body is combined with one counter bore and then is matched with a positioning screw hole in a retarder shell cover to realize prone position clamping; ten clamp threaded holes are formed in the clamp body, and the clamp body is matched with the four limiting rods and the at least two clamping bolts, so that the retarder shell cover can be clamped in a standing posture. The whole clamp is simple in structure and convenient to disassemble and assemble, retarder shell covers of multiple models can be clamped in a vertical posture or a horizontal posture through one clamp, the positioning planes are all the upper surfaces of the clamp bodies, and the positioning precision is guaranteed.

Description

Technical Field

[0001] The utility model relates to a positioning fixture, in particular to a positioning fixture suitable for profilometer measurement. Background Art

[0002] The profilometer is an instrument for testing and inspecting the contour, two-dimensional size, and two-dimensional displacement of an object. As a precision measuring instrument, it has high accuracy, stable indication, and high reliability, and is widely used in the automobile manufacturing industry. At present, factories that produce retarder parts mainly use profilometers to measure the contour and angular dimensions of the retarder shell cover on the production line of the retarder shell. However, the planes of the measured elements of the retarder shell cover products are different, and the measurement posture needs to be switched between the lying position and the standing position as needed. The positioning tool used on site can only complete the lying or standing measurement of one model of retarder shell cover after each assembly. After the measurement is completed, the positioning tool needs to be reassembled to perform positioning and measurement in another posture. The existing positioning tool is complicated to disassemble and assemble, which results in a long time and low detection efficiency for each inspection; and the positioning tool needs to be reassembled each time, the positioning accuracy is not uniform, and the measurement accuracy will also be affected.

[0003] The Chinese invention patent with application publication number CN112648950A discloses a fast positioning clamping fixture for three-coordinate detection, which uses three small positioning surfaces to locate the A surface of the retarder housing part to be measured, uses the first positioning pin to locate the positioning hole B of the retarder housing part to be measured, and the second positioning pin to locate the positioning hole C of the retarder housing part to be measured, and uses five pressed-in ball head plungers distributed around the outer contour of the retarder housing part to be measured, so as to completely position and clamp it; it adopts the "one face and two pins" positioning method, which solves the problems that the retarder housing part needs to be flipped multiple times during three-coordinate detection, the measurement process produces micro-movement due to lack of clamping, the measurement error introduced by the reference conversion, and the need to manually establish a coordinate system to determine the position of the part for each measurement. However, it still fails to solve the problem that the existing positioning tooling can only complete the lying or standing measurement of one model of retarder shell cover after each assembly, which leads to low detection efficiency and affected measurement accuracy. Utility Model Content

[0004] The utility model aims to solve the technical problems that the existing positioning tooling can only complete the lying or standing measurement of one model of retarder housing cover after each assembly, and the positioning tooling needs to be reassembled after the measurement is completed to carry out positioning and measurement of another posture, which leads to low detection efficiency and affected measurement accuracy. A positioning fixture suitable for contour meter measurement is provided.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A positioning fixture suitable for profilometer measurement, which is special in that it includes a fixture body, a limit rod and a clamping bolt;

[0007] The fixture body is provided with countersunk holes, including a reference countersunk hole and four fixed countersunk holes. The reference countersunk hole is combined with one of the fixed countersunk holes and matched with two positioning screw holes on the retarder housing cover to be clamped, so as to clamp the retarder housing cover on the fixture body in a lying position.

[0008] The clamp body is also provided with a clamp threaded hole, and there are ten clamp threaded holes, among which the centers of the first clamp threaded hole to the fourth clamp threaded hole are located on the straight line Z, and the fifth clamp threaded hole to the eighth clamp threaded hole are respectively and sequentially arranged on the same side away from the reference countersunk hole, the centers of the fifth clamp threaded hole and the seventh clamp threaded hole, and the sixth clamp threaded hole and the eighth clamp threaded hole are respectively located on the straight lines Z1 and Z2; the ninth clamp threaded hole and the tenth clamp threaded hole are respectively and sequentially arranged on the same side away from the reference countersunk hole as the sixth clamp threaded hole and the eighth clamp threaded hole, and the ninth clamp threaded hole and The center of the tenth fixture threaded hole is located on the straight line Z3; wherein, the centers of the first fixture threaded hole and the fifth fixture threaded hole, the second fixture threaded hole and the sixth fixture threaded hole and the ninth fixture threaded hole, the third fixture threaded hole and the seventh fixture threaded hole, the fourth fixture threaded hole and the eighth fixture threaded hole and the tenth fixture threaded hole are located on the straight lines Z4, Z5, Z6 and Z7 respectively, the straight lines Z, Z1, Z2 and Z3 are parallel, and the straight lines Z4, Z5, Z6 and Z7 are perpendicular to Z; the distances between Z1 and Z, Z2 and Z, and Z3 and Z are defined as L1, L2 and L3 respectively, then L3>L1>L2;

[0009] There are four limit rods, each of which includes a rod body and a threaded head arranged at one end of the rod body, the threaded head is adapted to the threaded hole of the clamp, and a plurality of threaded holes are arranged axially on the rod body, two of which are arranged on one side of the retarder housing cover, and the other two are correspondingly arranged on the other side of the retarder housing cover, and the inner side surface of each limit rod abuts against the retarder housing cover;

[0010] There are at least two clamping bolts, which are respectively screwed into the threaded holes of two limiting rods on one side of the retarder housing cover and abut against the retarder housing cover.

[0011] Furthermore, the four fixed countersinks are respectively a first fixed countersink, a second fixed countersink, a third fixed countersink and a fourth fixed countersink, wherein the first fixed countersink is located between the second fixed countersink and the reference countersink, and the centers of the second fixed countersink and the reference countersink are located on straight line Z8, and Z8 is parallel to Z; the third fixed countersink is located between the second fixed countersink and the fourth fixed countersink, and the third fixed countersink is located on the side of the second fixed countersink close to straight line Z.

[0012] Furthermore, a flexible gasket is provided at the end of the clamping bolt, the diameter of the flexible gasket is smaller than the diameter of the clamping bolt, and the clamping bolt abuts against the retarder housing cover through the flexible gasket.

[0013] Furthermore, the flexible gasket is a silicone flexible gasket, which is installed on the end of the clamping bolt by means of a screw, and the tail plane of the screw is lower than the outer end surface of the flexible gasket.

[0014] Furthermore, the clamp body is a rectangular parallelepiped structure with arc chamfers on all four sides.

[0015] Furthermore, the cross section of the rod body of the limit rod is rectangular, and the threaded holes are arranged on two sides corresponding to the long sides of the rod body, and the surfaces where the two long sides of the rod body are located are used to abut against the retarder housing cover.

[0016] Furthermore, a boss for cooperating with a precision vise is provided at the bottom of the clamp body.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The utility model provides a positioning fixture suitable for contour meter measurement, by setting a reference countersunk hole and a plurality of fixed countersunk holes on the fixture body. The reference countersunk hole is combined with one of the fixed countersunk holes and cooperates with two positioning screw holes on the retarder housing cover to be clamped to clamp the retarder housing cover in a lying position on the fixture body. Ten fixture threaded holes are set on the fixture body. The retarder housing cover can be clamped to the fixture body in an upright position through the cooperation of the fixture threaded holes, limit rods and clamping bolts. The entire fixture has a simple structure and is easy to assemble and disassemble, thereby improving the detection efficiency. One fixture can complete the upright or lying clamping of retarder housing covers of multiple models, and the positioning plane of each posture is the upper surface of the fixture body, thereby ensuring the positioning accuracy.

[0019] (2) The utility model provides a positioning fixture suitable for profilometer measurement, in which a flexible gasket is arranged at the end of the clamping bolt to prevent the retarder housing cover from being scratched or indented during the clamping process.

[0020] (3) The utility model provides a positioning fixture suitable for contour meter measurement, in which the cross-section of the rod body of the limit rod is rectangular, and the threaded holes are arranged on two sides corresponding to the long sides of the rod body. The surfaces where the two long sides of the rod body are located are used to abut against the retarder housing cover, thereby increasing the contact area between the limit rod and the retarder housing cover, reducing the pressure, and preventing the retarder housing cover from being scratched or indented during the clamping process.

[0021] (4) The utility model provides a positioning fixture suitable for profilometer measurement, in which a boss for cooperating with a precision vise is provided at the bottom of the fixture body. Thus, after the retarder housing cover is clamped on the fixture, it can be fixed by the precision vise and then inspected by the profilometer, which makes the measurement more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a fixture body in an embodiment of a positioning fixture suitable for profilometer measurement of the utility model;

[0023] Figure 2 This is a schematic diagram of the lying clamping of the A-type retarder housing cover in the embodiment of the positioning fixture suitable for profilometer measurement of the utility model;

[0024] Figure 3 This is a schematic diagram of the vertical clamping of the A-type retarder housing cover in the embodiment of the positioning fixture suitable for profilometer measurement of the utility model;

[0025] Figure 4 for Figure 3 AA section view;

[0026] Figure 5 for Figure 4 A partial enlarged view of

[0027] Figure 6 It is a front view of a limit rod in an embodiment of a positioning fixture suitable for profilometer measurement of the utility model;

[0028] Figure 7 A front view of a type A retarder housing cover clamped by an embodiment of the positioning fixture suitable for profilometer measurement of the utility model;

[0029] Figure 8 A front view of a B-type retarder housing cover clamped by an embodiment of the positioning fixture suitable for profilometer measurement of the utility model;

[0030] Fig. 9 A front view of a C-type retarder housing cover clamped by an embodiment of the positioning fixture suitable for profilometer measurement of the utility model;

[0031] Fig.10 A front view of a D-type retarder housing cover clamped by an embodiment of the positioning fixture suitable for profilometer measurement of the utility model;

[0032] The following are the descriptions of the reference numerals:

[0033] 1-clamp body, 11-boss; 2-limit rod, 21-rod body, 211-threaded hole, 22-threaded head; 3-clamping bolt, 4-clamp threaded hole, 41-first clamp threaded hole, 42-second clamp threaded hole, 43-third clamp threaded hole, 44-fourth clamp threaded hole, 45-fifth clamp threaded hole, 46-sixth clamp threaded hole, 47-seventh clamp threaded hole, 48-eighth clamp threaded hole, 49-ninth clamp threaded hole, 410-tenth clamp threaded hole; 5-countersink, 51-reference countersink, 52-first fixed countersink, 53-second fixed countersink, 54-third fixed countersink, 55-fourth fixed countersink; 6-flexible gasket, 7-retarder housing cover, 71-positioning screw hole. DETAILED DESCRIPTION

[0034] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Reference Figure 1-Figure 10 The utility model is a positioning fixture suitable for contour meter measurement, which includes a fixture body 1. The fixture body 1 is a rectangular parallelepiped structure with arc chamfers on all sides to prevent personnel from being scratched by edges and corners during transportation. A boss 11 for cooperating with a precision vise is provided at the bottom of the fixture body 1. After the retarder housing cover 7 is clamped onto the fixture body 1, the entire device can be fixed by cooperating with the precision vise through the boss 11, which is convenient for measurement.

[0036] In this embodiment, there are four types of retarder housing covers 7, namely, type A, type B, type C and type D. The four types of retarder housing covers 7 are respectively as follows: Figure 7-10 shown.

[0037] In order to realize the vertical clamping of the four types of retarder housing covers 7, a clamp threaded hole 4 is further provided on the clamp body 1. There are a total of ten clamp threaded holes 4, wherein the first clamp threaded hole 41, the second clamp threaded hole 42, the third clamp threaded hole 43 and the fourth clamp threaded hole 44 are in a row, and the centers of the four are located on the straight line Z, and the fifth clamp threaded hole 45, the sixth clamp threaded hole 46, the seventh clamp threaded hole 47 and the fourth clamp threaded hole 48 are respectively and sequentially provided on the same side of the four away from the reference countersunk hole 51. The eighth clamp threaded hole 48, wherein the centers of the fifth clamp threaded hole 45 and the seventh clamp threaded hole 47 are located on the straight line Z1, and the centers of the sixth clamp threaded hole 46 and the eighth clamp threaded hole 48 are located on the straight line Z2; on the same side of the sixth clamp threaded hole 46 and the eighth clamp threaded hole 48 away from the reference countersunk hole 51, the ninth clamp threaded hole 49 and the tenth clamp threaded hole 410 are respectively arranged in sequence, and the centers of the ninth clamp threaded hole 49 and the tenth clamp threaded hole 410 are located on the straight line Z3. Among them, the centers of the first clamp threaded hole 41 and the fifth clamp threaded hole 45, the second clamp threaded hole 42 and the sixth clamp threaded hole 46 and the ninth clamp threaded hole 49, the third clamp threaded hole 43 and the seventh clamp threaded hole 47, the fourth clamp threaded hole 44 and the eighth clamp threaded hole 48 and the tenth clamp threaded hole 410 are respectively located on the straight lines Z4, Z5, Z6 and Z7, while the straight lines Z, Z1, Z2 and Z3 are parallel, and the straight lines Z4, Z5, Z6 and Z7 are all perpendicular to Z; the distances between Z1 and Z, Z2 and Z, and Z3 and Z are defined as L1, L2 and L3 respectively, then L3>L1>L2.

[0038] In order to clamp all four types of retarder housing covers 7 in a standing position, a limit rod 2 is further provided. Four limit rods 2 are provided. Each limit rod 2 includes a rod body 21 and a threaded head 22 arranged at one end of the rod body 21. The threaded head 22 is adapted to the threaded hole 4 of the fixture. A plurality of threaded holes 211 are evenly distributed along the axial direction on the rod body 21, wherein two limit rods 2 are arranged on one side of the retarder housing cover 7, and the other two are correspondingly arranged on the other side of the retarder housing cover 7. The cross-section of the rod body 21 is rectangular, and the threaded holes are arranged on both sides corresponding to the long sides of the rod body 21. The surfaces where the two long sides of the rod body 21 are located are used to The retarder housing cover 7 is abutted, so that the contact area with the retarder housing cover 7 becomes larger, and it is not easy to produce indentations during clamping, and at least two clamping bolts 3 for clamping the retarder housing cover 7 are provided to meet the clamping requirements. In this embodiment, two clamping bolts 3 are provided, and the two clamping bolts 3 are respectively screwed into the threaded holes 211 of the two limit rods 2 on one side of the retarder housing cover 7, and the clamping bolts 3 are abutted against the retarder housing cover 7, and a flexible gasket 6 is provided at the end of the clamping bolt 3, and the flexible gasket 6 is installed at the end of the clamping bolt 3 by a screw, and the tail plane of the screw is lower than the outer end surface of the flexible gasket 6. The flexible gasket 6 is made of silicone material, which has good stability and is not easy to lose flexibility when used in a workshop environment. The diameter of the flexible gasket 6 is smaller than that of the clamping bolt 3 so that it can be placed in the threaded hole 211. The clamping bolt 3 abuts against the retarder housing cover 7 through the flexible gasket 6 to prevent indentations on the retarder housing cover 7, and the tail plane of the screw is lower than the outer end surface of the flexible gasket 6. When the flexible gasket 6 contacts the retarder housing cover 7, the tail of the screw will not contact the retarder housing cover 7 and cause indentations thereon. At the same time, the flexible gasket 6 installed by the screw is also easy to replace when damaged.

[0039] When the A-type retarder housing cover 7 is clamped in a standing position, a limit rod 2 is set in the second clamp threaded hole 42, the fourth clamp threaded hole 44, the sixth clamp threaded hole 46 and the eighth clamp threaded hole 48, and a clamping bolt 3 is set on the limit rod 2 located in the second clamp threaded hole 42 and the fourth clamp threaded hole 44 respectively; when the B-type retarder housing cover 7 is clamped in a standing position, a clamping bolt 3 is set in the first clamp threaded hole 41, the third clamp threaded hole 43, the fifth clamp threaded hole 45 and the seventh clamp threaded hole 47. A limit rod 2 is set in the middle, and clamping bolts 3 are respectively set on the limit rod 2 located in the first clamp threaded hole 41 and the third clamp threaded hole 43; when the C type retarder housing cover 7 and the D type retarder housing cover 7 are clamped in a standing position, a limit rod 2 is set in the second clamp threaded hole 42, the fourth clamp threaded hole 44, the ninth clamp threaded hole 49 and the tenth clamp threaded hole 410, and clamping bolts 3 are respectively set on the limit rod 2 located in the second clamp threaded hole 42 and the fourth clamp threaded hole 44.

[0040] A countersunk hole 5 is opened on the fixture body 1, and the countersunk hole 5 includes a reference countersunk hole 51, a first fixed countersunk hole 52, a second fixed countersunk hole 53, a third fixed countersunk hole 54 and a fourth fixed countersunk hole 55, wherein the first fixed countersunk hole 52 is located between the second fixed countersunk hole 53 and the reference countersunk hole 51, and the centers of the second fixed countersunk hole 53 and the reference countersunk hole 51 are located on a straight line Z8, and the straight line Z8 is parallel to the straight line Z; the third fixed countersunk hole 54 is located between the second fixed countersunk hole 53 and the fourth fixed countersunk hole 55, and the third fixed countersunk hole 54 is located on the side of the second fixed countersunk hole 53 close to the straight line Z.

[0041] Each type of retarder housing cover 7 is provided with two positioning screw holes 71. When the retarder housing cover 7 is clamped in a lying position, the two positioning screw holes 71 on the retarder housing cover 7 of type A respectively cooperate with the reference countersunk hole 51 and the second fixed countersunk hole 53, and the retarder housing cover 7 can be clamped in a lying position on the fixture body 1 through the M8x20 inner hexagonal bolt; while the two positioning screw holes 71 on the retarder housing cover 7 of type B respectively cooperate with the reference countersunk hole 51 and the first fixed countersunk hole 52, and then the retarder housing cover 7 is clamped in a lying position on the fixture body 1 through the M8x20 inner hexagonal bolt; the two positioning screw holes 71 on the retarder housing cover 7 of type C respectively cooperate with the reference countersunk hole 5 1 and the fourth fixed countersunk hole 55, and then the retarder housing cover 7 is clamped on the fixture body 1 in a lying position through the M8x20 hexagon socket bolt; the two positioning screw holes 71 on the D-type retarder housing cover 7 are respectively matched with the reference countersunk hole 51 and the third fixed countersunk hole 54, and then the retarder housing cover 7 is clamped on the fixture body 1 in a lying position through the M8x20 hexagon socket bolt. Through the five countersunk holes 5, the four types of retarder housing covers 7 can be clamped on the fixture body 1 in a lying position, and only bolts are used for clamping, which is easy to disassemble and assemble, and the measurement efficiency is improved. In addition, the positioning surface of each type of retarder housing cover 7 is the upper surface of the fixture body 1, which ensures the positioning accuracy.

[0042] The embodiments described above are merely descriptions of the specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A positioning fixture suitable for profilometer measurement, characterized in that: It comprises a clamp body (1), a limiting rod (2) and a clamping bolt (3); The clamp body (1) is provided with a countersunk hole (5), the countersunk hole (5) comprising a reference countersunk hole (51) and four fixed countersunk holes, the reference countersunk hole (51) and one of the fixed countersunk holes are combined and matched with two positioning screw holes (71) on the retarder housing cover (7) to be clamped, so as to clamp the retarder housing cover (7) in a lying position on the clamp body (1); The clamp body (1) is also provided with a clamp threaded hole (4), and there are ten clamp threaded holes (4), wherein the centers of the first clamp threaded hole (41) to the fourth clamp threaded hole (44) are located on a straight line Z, and the fifth clamp threaded hole (45) to the eighth clamp threaded hole (48) are respectively and sequentially provided on the same side away from the reference countersunk hole (51), and the centers of the fifth clamp threaded hole (45) and the seventh clamp threaded hole (47), and the sixth clamp threaded hole (46) and the eighth clamp threaded hole (48) are respectively located on straight lines Z1 and Z2; the ninth clamp threaded hole (49) and the tenth clamp threaded hole (410) are respectively and sequentially provided on the same side away from the reference countersunk hole (51) of the sixth clamp threaded hole (46) and the eighth clamp threaded hole (48), and The centers of the ninth clamp threaded hole (49) and the tenth clamp threaded hole (410) are located on the straight line Z3; wherein, the centers of the first clamp threaded hole (41) and the fifth clamp threaded hole (45), the second clamp threaded hole (42) and the sixth clamp threaded hole (46), the ninth clamp threaded hole (49), the third clamp threaded hole (43) and the seventh clamp threaded hole (47), the fourth clamp threaded hole (44) and the eighth clamp threaded hole (48) and the tenth clamp threaded hole (410) are located on the straight lines Z4, Z5, Z6 and Z7 respectively, the straight lines Z, Z1, Z2 and Z3 are parallel, and the straight lines Z4, Z5, Z6 and Z7 are perpendicular to Z; the distances between Z1 and Z, Z2 and Z, and Z3 and Z are defined as L1, L2 and L3 respectively, then L3>L1>L2; There are four limit rods (2), each of which comprises a rod body (21) and a threaded head (22) arranged at one end of the rod body (21), the threaded head (22) being adapted to the threaded hole (4) of the clamp, and a plurality of threaded holes (211) being arranged axially on the rod body (21), wherein two limit rods (2) are arranged on one side of the retarder housing cover (7), and the other two are correspondingly arranged on the other side of the retarder housing cover (7), and the inner side surface of each limit rod (2) is in contact with the retarder housing cover (7); There are at least two clamping bolts (3), which are respectively screwed into the threaded holes (211) of the two limiting rods (2) on one side of the retarder housing cover (7) and abut against the retarder housing cover (7).

2. The positioning fixture suitable for profilometer measurement according to claim 1, characterized in that: The four fixed countersunk holes are respectively a first fixed countersunk hole (52), a second fixed countersunk hole (53), a third fixed countersunk hole (54) and a fourth fixed countersunk hole (55), wherein the first fixed countersunk hole (52) is located between the second fixed countersunk hole (53) and the reference countersunk hole (51), and the centers of the second fixed countersunk hole (53) and the reference countersunk hole (51) are located on a straight line Z8, and Z8 is parallel to Z; the third fixed countersunk hole (54) is located between the second fixed countersunk hole (53) and the fourth fixed countersunk hole (55), and the third fixed countersunk hole (54) is located on the side of the second fixed countersunk hole (53) close to the straight line Z.

3. The positioning fixture suitable for profilometer measurement according to claim 2, characterized in that: A flexible gasket (6) is provided at the end of the clamping bolt (3); the diameter of the flexible gasket (6) is smaller than the diameter of the clamping bolt (3); the clamping bolt (3) abuts against the retarder housing cover (7) via the flexible gasket (6).

4. The positioning fixture suitable for profilometer measurement according to claim 3, characterized in that: The flexible gasket (6) is a silicone flexible gasket, and the flexible gasket (6) is installed on the end of the clamping bolt (3) by means of a screw, and the tail plane of the screw is lower than the outer end surface of the flexible gasket (6).

5. The positioning fixture suitable for profilometer measurement according to claim 4, characterized in that: The clamp body (1) is a rectangular parallelepiped structure with circular chamfers on all four sides.

6. The positioning fixture suitable for profilometer measurement according to claim 5, characterized in that: The rod body (21) of the limit rod (2) has a rectangular cross section, and the threaded holes (211) are arranged on two sides corresponding to the long sides of the rod body (21). The surfaces where the two long sides of the rod body (21) are located are used to abut against the retarder housing cover (7).

7. The positioning fixture suitable for profilometer measurement according to claim 6, characterized in that: The bottom of the clamp body (1) is provided with a boss (11) for cooperating with a precision vise.

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