A rocker arm arc surface Vickers hardness detection fixture and device

Abstract

The present application provides a rocker arm arc surface Vickers hardness detection fixture and device, belonging to the technical field of material strength testing. The detection fixture includes: a bottom plate and a positioning rod. Support plates are rotatably provided on both sides of the bottom plate. The positions between the support plates and the positioning rod are relatively fixed. A limiting groove is formed on the top surface of the support plate. The positioning rod and the front end of the bottom plate are connected by a screw rod for adjusting the angle between the positioning rod and the bottom plate. During clamping, the rocker arm is located between the support plates on both sides. The strip-shaped groove is clamped downward on the outside of the positioning rod, and the convex block is embedded in the limiting groove. A detachable pin shaft simultaneously passes through the support plate, the positioning rod and the through hole. The rotation axis of the support plate is parallel to the axis of the through hole. The detection device includes the rocker arm arc surface Vickers hardness detection fixture described above and a hardness tester. It can improve the detection accuracy and increase the detection points.

Description

Technical Field

[0001] The invention belongs to the technical field of material strength testing, and in particular relates to a rocker arm arc surface Vickers hardness testing fixture and device. Background Art

[0002] Most of the automobile valve rocker arm structures are not regular shapes, such as Figure 1 When testing the Vickers hardness of the top curved working surface of the rocker arm structure shown in the manufacturing industry, a diamond indenter with a top angle of 136° needs to be vertically pressed into the curved working surface. If the hardness tester indenter cannot be vertically pressed in, the indentation on the curved working surface will not be a regular quadrilateral, and the test value will be inaccurate.

[0003] However, the existing fixed-angle clamping device can generally only ensure that the topmost point of the arc surface is perpendicular to the pressure head, but cannot cover other positions on the arc surface, resulting in incomplete detection and few detection points. Summary of the invention

[0004] In order to solve the shortcomings of the prior art, the present invention provides a rocker arm arc surface Vickers hardness testing fixture and device, which can adjust the angle of the rocker arm so that the tangent direction of each segment of the rocker arm arc surface can be kept perpendicular to the indenter of the hardness tester, which can not only improve the detection accuracy but also increase the detection points, thereby performing a more comprehensive hardness test on various parts of the arc surface of the rocker arm.

[0005] In order to achieve the purpose of the present invention, the following scheme is proposed:

[0006] A rocker arm arc surface Vickers hardness testing fixture comprises: a bottom plate and a positioning rod. The bottom of the rocker arm is provided with a strip groove along the length direction, the middle section of the top surface of the two side walls of the rocker arm has an upwardly convex arc surface, the two ends of the arc surface are arranged along the front and rear direction of the rocker arm, the bottom of the arc surface has a vertical downward convex block, and the convex block is located on the outside of the rocker arm, and one end of the rocker arm is provided with a through hole, and the axis of the through hole is parallel to the center line of the arc surface.

[0007] Support plates are rotatably arranged on both sides of the bottom plate. The positions between the support plates and the positioning rods are relatively fixed. Limiting grooves are arranged on the top surfaces of the support plates. The positioning rods are connected to the front ends of the bottom plate by screws for adjusting the angle between the positioning rods and the bottom plate.

[0008] When clamping, the rocker arm is located between the support plates on both sides, the strip groove is clamped downward on the outside of the positioning rod, the protrusion is embedded in the limit groove, and a detachable pin shaft passes through the support plate, the positioning rod and the through hole at the same time. At this time, the rotation axis of the support plate is parallel to the axis of the through hole.

[0009] Furthermore, the center line of the arc surface is coaxial with the rotation axis of the support plate.

[0010] Further, the pin shaft is connected to the rear section of the positioning rod, and the limiting groove is located between the pin shaft and the front end of the positioning rod.

[0011] Further, the rear section of the positioning rod is connected to the support plate through a connecting shaft. The pin shaft is located at the front section of the positioning rod, and the limiting groove is between the pin shaft and the connecting shaft.

[0012] Further, a rectangular groove is horizontally formed at the front end of the bottom plate. A runner is arranged in the rectangular groove. A strip-shaped hole is vertically formed at the front section of the bottom plate. The length direction of the strip-shaped hole is consistent with the length direction of the bottom plate, and the strip-shaped hole communicates with the rectangular groove. The upper end of the screw rod is rotatably connected to the positioning rod. The lower section of the screw rod passes downward through the strip-shaped hole and is threadedly connected to the runner.

[0013] Further, a pressing screw is arranged above the bottom plate corresponding to the runner for pressing the runner.

[0014] Further, inclined surfaces are arranged on both sides of the support plate corresponding to the limiting groove. When the rocker arm is clamped, there is a gap between the bottom surface of the convex block and the bottom surface of the limiting groove, and both inclined surfaces are in contact with the bottom surface of the solid part forming the arc surface.

[0015] A rocker arm arc surface Vickers hardness detection device includes the above-mentioned rocker arm arc surface Vickers hardness detection fixture and a hardness tester. The hardness tester is vertically arranged above the rocker arm arc surface Vickers hardness detection fixture.

[0016] Further, the axis of the hardness tester is perpendicular to and intersects with the rotation axis of the support plate. After the rocker arm is clamped, the center line of the arc surface is coaxial with the rotation axis of the support plate.

[0017] Further, the hardness tester is movably arranged along the rotation axis direction of the support plate.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The rocker arm is clamped by the fixture. By adjusting the screw rod, the angle of the rocker arm can be changed, so that the arc surface of the rocker arm can maintain a state perpendicular to the hardness value indenter at each place for hardness detection. It can not only improve the accuracy of detection, but also increase the detection points of the arc surface, making the detection result more real and comprehensive.

[0020] 2. The detection device sets the center line of the arc surface to be coaxial with the rotation axis of the support plate, and arranges the hardness tester above the fixture, so that the extension line of the axis of the hardness tester is perpendicular to and intersects with the center line of the arc surface and the rotation axis of the support plate. Through the above structural settings, the position of the hardness tester can be kept fixed. Only by adjusting the inclination angle of the positioning rod through the screw rod, the hardness detection of each section of the arc surface along the arc track can be realized. The hardness detection of multiple positions can be completed by clamping in sequence, which can reduce the adjustment times of the fixture or the hardness tester and improve the detection efficiency. Description of the Drawings

[0021] The accompanying drawings described in this document are only for illustrating the selected embodiments, not all possible implementation schemes, and are not intended to limit the scope of the present invention.

[0022] Figure 1 The structural schematic diagram of the rocker arm detected by this application is shown.

[0023] Figure 2 The end view of the rocker arm detected by this application is shown.

[0024] Figure 3 The structural exploded view of an embodiment of the detection fixture is shown.

[0025] Figure 4 The structural view of the front end when the detection fixture clamps the rocker arm is shown.

[0026] Figure 5 The structural schematic diagram of a preferred embodiment of the detection fixture is shown.

[0027] Figure 6 The structural schematic diagram of another preferred embodiment of the detection fixture is shown.

[0028] Markings in the figure: rocker arm - 1, strip groove - 11, arc surface - 12, convex block - 13, through hole - 14, bottom plate - 2, rectangular groove - 21, strip hole - 22, positioning rod - 3, connecting plate - 31, screw - 4, support plate - 5, limit groove - 51, rotating shaft - 52, inclined surface - 53, pin shaft - 6, connecting shaft - 7, runner - 8, compression screw - 9. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following describes the implementation manners of the present invention in detail with reference to the accompanying drawings. However, the embodiments described in the present invention are some embodiments of the present invention, not all embodiments.

[0030] Embodiment 1

[0031] The structure of the rocker arm detected by this application is as Figure 1 , Figure 2 shown. A strip groove 11 is provided along the length direction at the bottom of the rocker arm 1. The middle sections of the top surfaces of the two side walls of the rocker arm 1 have upwardly convex arc surfaces 12. The two ends of the arc surface 12 are arranged along the front - rear direction of the rocker arm 1. The bottoms of the arc surfaces 12 both have vertically downward convex blocks 13, and the convex blocks 13 are located outside the rocker arm 1. A through hole 14 is provided at one end of the rocker arm 1, and the axis of the through hole 14 is parallel to the center line of the arc surface 12.

[0032] As Figure 3 , Figure 4As shown in the figure, a rocker arm arc surface Vickers hardness detection fixture includes: a bottom plate 2 and a positioning rod 3.

[0033] Specifically, support plates 5 are provided on both sides of the bottom plate 2. The support plates 5 are rotatably arranged around a rotating shaft 52, and the rotating shaft 52 passes through the bottom plate 2. The positions between the support plates 5 and the positioning rod 3 are relatively fixed. When the positioning rod 3 swings, the support plates 5 swing together with the positioning rod 3. As Figure 4 、 Figure 5 shown in the figure, a connecting plate 31 can be used to connect the bottom surface of the positioning rod 3 and the inner walls of the support plates 5 on both sides at the same time, so as to realize the relative fixation of the positions between the support plates 5 and the positioning rod 3.

[0034] Specifically, as Figure 3 and Figure 4 、 Figure 5 shown in the figure, a limiting groove 51 is opened on the top surface of the support plate 5. The positioning rod 3 and the front end of the bottom plate 2 are connected by a screw rod 4, which is used to adjust the angle between the positioning rod 3 and the bottom plate 2. The screw rod 4 can adjust the positioning rod 3 to swing around the rotating shaft 52, so as to control the angle between the positioning rod 3 and the bottom plate 2.

[0035] During clamping, the rocker arm 1 is located between the support plates 5 on both sides. The strip-shaped groove 11 is clamped downward outside the positioning rod 3, and the convex block 13 is embedded in the limiting groove 51. A detachable pin shaft 6 passes through the support plate 5, the positioning rod 3 and the through hole 14 at the same time. Using a pin shaft 6 to connect the support plate 5, the positioning rod 3 and the rocker arm 1 at the same time can make the fixture structure simpler and the rocker arm 1 can be quickly disassembled and assembled. At this time, the rotation axis of the support plate 5 is parallel to the axis of the through hole 14.

[0036] By making the positioning rod 3 swing around the rotating shaft 52, the positions of each section of the arc surface 12 can be adjusted, so that the tangent line of the detection point of the arc surface 12 is perpendicular to the indenter of the hardness tester during the detection of each section of the arc surface 12, thereby improving the detection accuracy, and enabling each section of the arc surface 12 to perform hardness detection in a state perpendicular to the indenter of the hardness tester, increasing the number of detection points on the arc surface 12 and making the detection accuracy higher.

[0037] Preferably, the center line of the arc surface 12 is coaxial with the rotation axis of the support plate 5, that is, the center line of the arc surface 12 is coaxial with the rotating shaft 52. This structural design can ensure that when the positioning rod 3 swings around the rotating shaft 52 to adjust the detection position of the arc surface 12, each section of the arc surface 12 has an appropriate chance to be at the vertex of the arc surface 12, and this top position is a relatively fixed position, that is, the position where a line perpendicular to the bottom plate 2 and intersecting the axis of the rotating shaft 52 intersects the arc surface 12 is the vertex of the arc surface 12. If the indenter of the hardness tester is set at the vertex position of the arc surface 12, the arc surface 12 can be moved to the vertex at each place by adjusting the positioning rod 3 for hardness testing. With this structural arrangement, it is possible to avoid repeatedly adjusting the position of the hardness tester and the position of the detection fixture, which is beneficial to improving the detection efficiency and maintaining the detection of each part of the arc surface 12 under the same detection conditions, further improving the detection accuracy.

[0038] Embodiment 2

[0039] As Figure 5 shown, a rocker arm arc surface Vickers hardness detection fixture includes: a bottom plate 2 and a positioning rod 3. Support plates 5 are provided on both sides of the bottom plate 2, and the positions between the support plates 5 and the positioning rod 3 are relatively fixed. When the positioning rod 3 swings, the support plates 5 swing with the movement of the positioning rod 3.

[0040] Specifically, a limiting groove 51 is formed on the top surface of the support plate 5, and the positioning rod 3 and the front end of the bottom plate 2 are connected by a screw 4 for adjusting the angle between the positioning rod 3 and the bottom plate 2.

[0041] Specifically, during clamping, the rocker arm 1 is located between the support plates 5 on both sides, the strip-shaped groove 11 is clamped downward outside the positioning rod 3, and the convex block 13 is embedded in the limiting groove 51. A detachable pin shaft 6 passes through the support plate 5, the positioning rod 3 and the through hole 14 at the same time. At this time, the rotation axis of the support plate 5 is parallel to the axis of the through hole 14.

[0042] More specifically, as Figure 5 shown, the pin shaft 6 is connected to the rear section of the positioning rod 3, and the limiting groove 51 is located between the pin shaft 6 and the front end of the positioning rod 3. Thus, the arc surface 12 is located in the middle section of the positioning rod 3. Since the front end of the positioning rod 3 is supported by the screw 4 and the rear end is supported by the support plate 5 connected by the pin shaft 6, the force on the middle section of the positioning rod 3 is more stable. When applying pressure to the arc surface 12 with a hardness tester for hardness testing, the supporting force provided by the fixture to the rocker arm 1 is more stable.

[0043] Embodiment 3

[0044] A jig for detecting the Vickers hardness of the arc surface of a rocker arm includes: a bottom plate 2 and a positioning rod 3. Support plates 5 are provided on both sides of the bottom plate 2. The positions between the support plates 5 and the positioning rod 3 are relatively fixed. When the positioning rod 3 swings, the support plates 5 move and swing with the positioning rod 3. A limiting groove 51 is formed on the top surface of the support plate 5. The positioning rod 3 and the front end of the bottom plate 2 are connected by a screw rod 4 for adjusting the angle between the positioning rod 3 and the bottom plate 2.

[0045] Specifically, during clamping, the rocker arm 1 is located between the support plates 5 on both sides. The strip-shaped groove 11 is clamped downward outside the positioning rod 3, and the convex block 13 is embedded in the limiting groove 51. A detachable pin shaft 6 passes through the support plate 5, the positioning rod 3, and the through hole 14 at the same time. At this time, the rotation axis of the support plate 5 is parallel to the axis of the through hole 14.

[0046] More specifically, as Figure 5 shown, the pin shaft 6 is connected to the rear section of the positioning rod 3, and the limiting groove 51 is located between the pin shaft 6 and the front end of the positioning rod 3.

[0047] The center line of the arc surface 12 is coaxial with the rotation axis of the support plate 5.

[0048] Embodiment 4

[0049] As Figure 3 、 Figure 6 shown, a jig for detecting the Vickers hardness of the arc surface of a rocker arm includes: a bottom plate 2 and a positioning rod 3. Support plates 5 are provided on both sides of the bottom plate 2. The positions between the support plates 5 and the positioning rod 3 are relatively fixed. When the positioning rod 3 swings, the support plates 5 move and swing with the positioning rod 3.

[0050] Specifically, a limiting groove 51 is formed on the top surface of the support plate 5. The positioning rod 3 and the front end of the bottom plate 2 are connected by a screw rod 4 for adjusting the angle between the positioning rod 3 and the bottom plate 2.

[0051] Specifically, during clamping, the rocker arm 1 is located between the support plates 5 on both sides. The strip-shaped groove 11 is clamped downward outside the positioning rod 3, and the convex block 13 is embedded in the limiting groove 51. A detachable pin shaft 6 passes through the support plate 5, the positioning rod 3, and the through hole 14 at the same time. At this time, the rotation axis of the support plate 5 is parallel to the axis of the through hole 14.

[0052] More specifically, the rear section of the positioning rod 3 is connected to the support plate 5 by a connecting shaft 7. The pin shaft 6 is located at the front section of the positioning rod 3, and the limiting groove 51 is between the pin shaft 6 and the connecting shaft 7. The pin shaft 6, the connecting shaft 7, and the rotating shaft 52 of the support plate 5 form a triangular structure. The limiting groove 51 is between the connection line of the pin shaft 6 and the connecting shaft 7 and is correspondingly located above the rotating shaft 52. This structure can make the arc surface 12 face exactly above the rotating shaft 52, making the force on the arc surface 12 of the swing arm 1 more stable. This structure uses the connecting shaft 7 to connect the positioning rod 3 and the support plates 5 on both sides into one body, and at the same time combines the pin shaft 6 to fix the relative positions of the positioning rod 3 and the support plate 5.

[0053] Embodiment 5

[0054] As Figure 3 、 Figure 6 shown, a Vickers hardness testing fixture for the arc surface of a swing arm includes: a bottom plate 2 and a positioning rod 3. Support plates 5 are provided on both sides of the bottom plate 2. The positions between the support plates 5 and the positioning rod 3 are relatively fixed. When the positioning rod 3 swings, the support plates 5 move and swing with the positioning rod 3. A limiting groove 51 is formed on the top surface of the support plate 5. The front end of the positioning rod 3 and the bottom plate 2 are connected by a screw rod 4 for adjusting the angle between the positioning rod 3 and the bottom plate 2.

[0055] Specifically, during clamping, the swing arm 1 is located between the support plates 5 on both sides. The strip-shaped groove 11 is clamped downward outside the positioning rod 3, and the convex block 13 is embedded in the limiting groove 51. A detachable pin shaft 6 passes through the support plate 5, the positioning rod 3, and the through hole 14 at the same time. At this time, the rotation axis of the support plate 5 is parallel to the axis of the through hole 14.

[0056] More specifically, as Figure 3 、 Figure 6 shown, the rear section of the positioning rod 3 is connected to the support plate 5 by a connecting shaft 7. The pin shaft 6 is located at the front section of the positioning rod 3, and the limiting groove 51 is between the pin shaft 6 and the connecting shaft 7.

[0057] The center line of the arc surface 12 is coaxial with the rotation axis of the support plate 5.

[0058] Preferably, a rectangular groove 21 is horizontally formed at the front end of the bottom plate 2. A runner 8 is arranged in the rectangular groove 21. A strip-shaped hole 22 is vertically formed in the front section of the bottom plate 2. The length direction of the strip-shaped hole 22 is consistent with the length direction of the bottom plate 2, and the strip-shaped hole 22 communicates with the rectangular groove 21. The upper end of the screw rod 4 is rotatably connected to the positioning rod 3. The lower section of the screw rod 4 downwardly passes through the strip-shaped hole 22 and is threadedly connected to the runner 8. By rotating the runner 8, the upward or downward movement position of the screw rod 4 can be adjusted to change the inclination angle of the positioning rod 3, so as to realize the adjustment of the detection position of the arc surface 12. During the upward or downward movement of the screw rod 4, the screw rod 4 will move along the strip-shaped hole 22 to adapt to the movement of the connection position between the positioning rod 3 and the screw rod 4 caused by the swing of the positioning rod 3 around the rotating shaft 52.

[0059] Preferably, as Figures 3 to 6 shown, a compression screw 9 is arranged above the bottom plate 2 corresponding to the runner 8 for compressing the runner 8. After adjusting the angle of the positioning rod 3 by using the runner 8, the runner 8 is downwardly compressed by the compression screw 9 to eliminate the gap between the runner 8 and the rectangular groove 21, and to avoid the up and down displacement of the runner 8 driving the positioning rod 3 and the rocker arm 1 during hardness detection, which affects the detection accuracy. When it is necessary to rotate the runner 8, the compression screw 9 can be loosened upward.

[0060] Preferably, as Figure 3 , Figure 5 and Figure 6 shown, inclined surfaces 53 are arranged on both sides of the top surface of the support plate 5 corresponding to the limit slot 51 to facilitate the insertion of the convex block 13 into the limit slot 51. When clamping the rocker arm 1, there is a gap between the bottom surface of the convex block 13 and the bottom surface of the limit slot 51, and both side inclined surfaces 53 are in contact with the bottom surface of the entity part forming the arc surface 12. The rocker arm 1 is supported by the inclined surfaces 53 on both sides of the limit slot 51, adopting a surface contact structure. First of all, the support stability can be improved. Secondly, the inclined surfaces 53 on both sides of the limit slot 51 form a V-shaped structure. Since the pin shaft 6 needs to be disassembled and assembled, there is a clearance fit between the pin shaft 6 and the positioning rod, the support plate 5, and the through hole 14. Therefore, there will be a gap during clamping. At this time, the V-shaped structure formed by the inclined surfaces 53 on both sides can be used to cooperate with the entity part below the arc surface 12 to further limit the rocker arm 1, so that the position of the rocker arm 1 in the fixture is more accurate and more stable.

[0061] Embodiment 6

[0062] A rocker arm arc surface Vickers hardness detection device includes the above-mentioned rocker arm arc surface Vickers hardness detection fixture and a hardness meter. The hardness meter is vertically arranged above the rocker arm arc surface Vickers hardness detection fixture, and the reflection detection of the arc surface 12 is realized by applying a downward pressure to the hardness meter.

[0063] Preferably, the axis of the hardness tester is perpendicular to and intersects the axis of rotation of the support plate 5, that is, the rotating shaft 52, and after the rocker arm 1 is clamped, the center line of the arc surface 12 is coaxial with the axis of rotation of the support plate 5.

[0064] Preferably, the hardness tester is movably arranged along the axis of rotation of the support plate 5 to adapt to the detection of the two arc surfaces 12 on the top surface of the rocker arm 1.

[0065] The above are only the preferred embodiments of the present invention and do not represent the only or limit the present invention. Those skilled in the art should understand that various changes or equivalent replacements made to the present invention without departing from the scope of the present invention all fall within the scope of protection of the present invention.

Claims

1. A rocker arm arc surface Vickers hardness testing fixture. A strip-shaped groove (11) is formed in the bottom of the rocker arm (1) along the length direction. In the middle section of the top surfaces of the two side walls of the rocker arm (1), there are upwardly convex arc surfaces (12). The two ends of the arc surface (12) are arranged along the front-back direction of the rocker arm (1). At the bottom of each arc surface (12), there is a vertically downward convex block (13), and the convex block (13) is located outside the rocker arm (1). A through hole (14) is formed at one end of the rocker arm (1), and the axis of the through hole (14) is parallel to the center line of the arc surface (12). It is characterized in that; The fixture includes: a base plate (2) and a positioning rod (3). Support plates (5) are rotatably provided on both sides of the base plate (2). The positions between the support plates (5) and the positioning rod (3) are relatively fixed. A limiting groove (51) is formed on the top surface of the support plate (5). The front end of the positioning rod (3) and the base plate (2) are connected by a screw rod (4) for adjusting the angle between the positioning rod (3) and the base plate (2). Among them, the support plate (5) is rotatably arranged around a rotating shaft (52). A rectangular groove (21) is formed in the front end of the base plate (2) in the horizontal direction. A rotating wheel (8) is arranged in the rectangular groove (21). A strip-shaped hole (22) is formed in the front section of the base plate (2) in the vertical direction. The length direction of the strip-shaped hole (22) is the same as the length direction of the base plate (2), and the strip-shaped hole (22) communicates with the rectangular groove (21). The upper end of the screw rod (4) is rotatably connected to the positioning rod (3). The lower section of the screw rod (4) passes downward through the strip-shaped hole (22) and is threadedly connected to the rotating wheel (8). By rotating the rotating wheel (8), the upward or downward movement position of the screw rod (4) can be adjusted to change the inclination angle of the positioning rod (3), so as to realize the adjustment of the detection position of the arc surface (12). During the upward or downward movement of the screw rod (4), the screw rod (4) will move along the strip-shaped hole (22) to adapt to the movement of the connection position between the positioning rod (3) and the screw rod (4) caused by the swing of the positioning rod (3) around the rotating shaft (52). During clamping, the swing arm (1) is located between the support plates (5) on both sides. The strip-shaped groove (11) is clamped downward outside the positioning rod (3). The convex block (13) is embedded in the limiting groove (51). A detachable pin shaft (6) passes through the support plate (5), the positioning rod (3) and the through hole (14) at the same time. At this time, the rotation axis of the support plate (5) is parallel to the axis of the through hole (14).

2. The rocker arm arc surface Vickers hardness detection fixture according to claim 1, characterized in that, The center line of the arc surface (12) is coaxial with the rotation axis of the support plate (5).

3. The rocker arm arc surface Vickers hardness detection fixture according to claim 1 or claim 2, characterized in that, The pin shaft (6) is connected to the rear section of the positioning rod (3), and the limiting groove (51) is located between the pin shaft (6) and the front end of the positioning rod (3).

4. The rocker arm arc surface Vickers hardness detection fixture according to claim 1 or claim 2, characterized in that The rear section of the positioning rod (3) is connected to the support plate (5) by a connecting shaft (7). The pin shaft (6) is located in the front section of the positioning rod (3), and the limiting groove (51) is between the pin shaft (6) and the connecting shaft (7).

5. The rocker arm arc surface Vickers hardness detection fixture according to claim 1, wherein, A pressing screw (9) is provided above the base plate (2) corresponding to the rotating wheel (8) for pressing the rotating wheel (8).

6. The rocker arm arc surface Vickers hardness detection fixture according to claim 1, wherein On both sides of the limiting groove (51) on the top surface of the support plate (5), inclined surfaces (53) are provided. When the swing arm (1) is clamped, there is a gap between the bottom surface of the convex block (13) and the bottom surface of the limiting groove (51). Both inclined surfaces (53) are in contact with the bottom surface of the solid part forming the arc surface (12).

7. A rocker arm arc surface Vickers hardness testing device, characterized in that, It includes the swing arm arc surface Vickers hardness detection fixture according to any one of claims 1 to 6 and a hardness tester. The hardness tester is vertically arranged above the swing arm arc surface Vickers hardness detection fixture.

8. The rocker arm arc surface Vickers hardness testing device according to claim 7, characterized in that, The axis of the hardness tester is perpendicular to and intersects with the rotation axis of the support plate (5). After clamping the swing arm (1), the center line of the arc surface (12) is coaxial with the rotation axis of the support plate (5).

9. The rocker arm arc surface Vickers hardness testing device according to claim 7, characterized in that The hardness tester is arranged to move along the rotation axis direction of the support plate (5).

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