A metal material surface hardness detection device

Abstract

The application discloses a metal material surface hardness detection equipment and relates to the field of metal material detection.The metal material surface hardness detection equipment comprises a machine table, a jacking seat arranged on the machine table, a detection pressure head and a controller, an annular seat is arranged on the outside of the machine table, a bearing disc is rotatably arranged on the annular seat, the upper surface of the bearing disc is flush with the upper surface of the annular seat, eight pressure bearing seats are equidistantly arranged on the bearing disc, an auxiliary detection unit is arranged between the pressure bearing seats and the bearing disc, a driving unit is arranged on the outside of the annular seat, the driving unit drives the annular seat to intermittently rotate, and the single rotation angle is 45°. The metal material surface hardness detection equipment is characterized in that the annular seat, the bearing disc, the pressure bearing block, the detection auxiliary unit, the driving unit, the feeding mechanism, the discharging mechanism and the indentation image acquisition camera are cooperated with each other, automatic operation of the metal detection block in the detection process is realized, manual intervention is not needed, and therefore the efficiency of metal material hardness detection is effectively improved.

Description

Technical Field

[0001] This invention relates to metal material testing technology, specifically to a metal material surface hardness testing device. Background Technology

[0002] Hardness, as a key indicator for measuring the mechanical properties of metallic materials, reflects a material's ability to resist localized deformation and is a commonly used standard for assessing the degree of softness or hardness of a material. It plays a crucial role in the performance evaluation of metallic materials, process quality monitoring, and the development of new materials. In quality supervision, hardness testing helps manufacturers ensure products meet quality standards during industrial processing, reducing scrap rates, avoiding waste of materials and resources, and effectively controlling production costs. In process optimization, engineers use hardness testing to select appropriate materials and processing techniques to meet the performance and durability requirements of different applications. Hardness testing can also monitor the effects of heat treatment, surface hardening, and other processes, allowing for timely adjustments to process parameters and optimization of the production process. In the research and development of new materials and products, hardness testing is of great significance for evaluating material performance and guiding research directions. For parts that need to withstand specific loads and pressures, hardness is a key indicator for assessing their safety.

[0003] When developing or verifying micro-precision parts, workpieces that are prone to overall deformation during indentation, and new metal materials, the same processing technology is generally used to make samples. Then, the hardness of the samples is tested using a hardness tester, and the characteristics of the metal material are determined based on the test results.

[0004] The Brinell hardness tester is a commonly used testing device for surface hardness testing of metallic materials. In its operation, the operator first places the material on the corresponding testing platform. After clamping the material using the clamping plates, the platform is vertically raised by rotating the screw until the material surface contacts the indenter. The indenter then indents the material surface. After indentation, the platform is lowered by rotating the screw until the material is out of the indenter's contact area. The platform is then slid horizontally to a position facing the observation lens. The lens measures the weld diameter horizontally and vertically to obtain the material's hardness data. However, this method requires frequent manual switching between material stations, which is time-consuming and labor-intensive. Furthermore, when testing batches of materials, the platform needs to be replaced one by one, leading to inefficiency.

[0005] Chinese invention patent application CN116499908A discloses a metal material surface hardness testing device. It sets up three testing stations corresponding to the "replacement-indentation-measurement" stations to achieve smooth metal material testing. However, in actual application, the handling of workpieces and clamping of the clamps require too much human intervention, resulting in excessive manual intervention during the testing process and making it impossible to significantly improve the sample testing efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a surface hardness testing device for metal materials to overcome the above-mentioned shortcomings in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a surface hardness testing device for metal materials, comprising a machine base and a lifting seat, a testing head, and a controller disposed on the machine base. A ring seat is installed outside the machine base, and a bearing plate is rotatably mounted on the ring seat. The upper surface of the bearing plate is flush with the upper surface of the ring seat. Eight pressure seats are equidistantly mounted on the bearing plate. An auxiliary testing unit is disposed between the pressure seats and the bearing plate. A driving unit is disposed outside the ring seat, and the driving unit drives the ring seat to rotate intermittently, with a single rotation angle of 45°. The machine base is provided with a mounting base, a feeding mechanism and a feeding mechanism in sequence along the rotation direction of the bearing plate. The feeding mechanism is located on the side adjacent to the detection pressure head. An indentation image acquisition camera is installed below the mounting base. The feeding mechanism includes a feeding port opened on the ring seat, a receiving cylinder corresponding to the feeding port installed below the ring seat, a number of detection blocks placed inside the receiving cylinder, and a pull plate corresponding to the bearing plate installed on the surface of the machine base. The feeding mechanism includes a feeding cylinder installed on a ring seat, and a pusher plate corresponding to the bearing plate is installed on the side of the machine base; The detection pressure head, the indentation image acquisition camera, the receiving cylinder, and the unloading cylinder are arranged in a rectangular shape above the support plate.

[0008] Furthermore, the auxiliary detection unit includes a bearing groove equidistantly spaced in a circular shape on the bearing plate. The bottom of the bearing groove has a through groove corresponding to the lifting seat. The pressure seat is slidably connected inside the bearing groove, and the depth of the bearing groove is the same as the height of the pressure seat. Guide rods are symmetrically slidably connected to both sides of the bottom surface of the bearing groove. The bottom end of the guide rod penetrates the bottom of the bearing groove and extends to the outside. The top of the guide rod is fixedly connected to the pressure seat. A limiting piece is fixedly connected to the bottom of the guide rod. A return spring is fixedly connected between the limiting piece and the bottom surface of the bearing plate. The return spring is sleeved on the outside of the guide rod.

[0009] Furthermore, the drive unit includes a toothed ring fixedly connected to the inner ring surface of the bearing disk. The side of the ring seat is provided with a ring groove corresponding to the toothed ring. A drive gear is rotatably mounted on the inner side of the ring groove. The drive gear is driven by a motor and meshes with the toothed ring.

[0010] Furthermore, the feeding mechanism also includes a receiving frame installed on the surface of the ring seat, the receiving frame being provided with a limiting groove, a limiting ring being installed on the side of the unloading cylinder, the shape and specifications of the limiting ring being adapted to the limiting groove, a feeding electric rod being installed inside the machine base, the pusher plate being fixedly connected to the end of the telescopic end of the feeding electric rod, and the pusher plate being slidably connected to the surface of the ring seat.

[0011] Furthermore, the distance between the bottom of the feed cylinder opening and the surface of the ring seat is greater than the thickness of the detection block, and the thickness difference is 2mm. The thickness and length of the pusher plate are consistent with those of the detection block.

[0012] Furthermore, the unloading mechanism also includes an unloading electric rod mounted on the machine base. Guide rods located on both sides of the unloading electric rod are symmetrically slidably connected to the surface of the machine base. The guide rods extend into the interior of the machine base and are slidably connected to its inner wall. The ends of the two guide rods are fixedly connected to the same mounting plate. An adjusting electric rod is mounted on the top of the mounting plate. The pull plate is fixedly connected to the bottom of the telescopic end of the adjusting electric rod, and the pull plate is slidably connected to the surface of the mounting plate.

[0013] Furthermore, a base is installed on the surface of the machine tool, symmetrically arranged support strips are installed on the top of the side of the receiving cylinder, and a bracket adapted to the support strips is installed at the bottom of the ring seat. When the support strips are embedded in the brackets, the bottom of the receiving cylinder contacts the upper surface of the base, and the top of the receiving cylinder contacts the bottom surface of the ring seat.

[0014] Furthermore, the shape and specifications of the discharge port correspond to those of the detection block.

[0015] Furthermore, a buffer spring is installed at the bottom of the inner wall of the receiving cylinder, and a pressure control plate is fixedly connected to the top of the buffer spring. The pressure control plate is slidably connected to the inner wall of the receiving cylinder, and its shape and specifications are adapted to the inner wall of the receiving cylinder. A one-way exhaust valve communicating with the inside of the receiving cylinder is installed on the outer side of the receiving cylinder. The gas flow direction inside the one-way exhaust valve is from the inside of the receiving cylinder to the outside. A vent pipe is fixedly connected to the outer surface of the receiving cylinder, and a cap is threaded to the end of the vent pipe.

[0016] Furthermore, an embedded groove extending into the inside of the feed cylinder is provided on the side near the cylinder opening, and a sealing plate is slidably connected to the inner side of the embedded groove. The width of the embedded groove is greater than the width of the inner wall of the feed cylinder.

[0017] Compared with the prior art, the surface hardness testing device for metal materials provided by the present invention has the following beneficial effects: 1. This metal material surface hardness testing equipment, through the cooperation of the ring seat, bearing plate, pressure block, testing auxiliary unit, driving unit, as well as the feeding mechanism, unloading mechanism, and indentation image acquisition camera, enables the metal testing block to achieve automated operation during the testing process without manual intervention, thereby effectively improving the efficiency of metal material hardness testing.

[0018] 2. This metal material surface hardness testing equipment, through the cooperation of buffer springs, pressure control plates, one-way exhaust valves, vent pipes, and caps, can effectively buffer the impact force of the test block when it falls during collection, thus enabling stable storage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 Provided for embodiments of the present invention Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the structure of the carrier disk and the ring seat in a separated state according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the pressure bearing seat and the bearing plate in a separated state according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the separation state of the feed cylinder and the ring seat provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the receiving cylinder and the base in a separated state according to an embodiment of the present invention; Figure 7 This is a partial cross-sectional view of the receiving cylinder provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the assembly state of the sealing plate and the feeding cylinder provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Machine base; 11. Lifting seat; 12. Detection pressure head; 13. Controller; 2. Ring seat; 21. Bearing plate; 22. Pressure bearing seat; 3. Mounting seat; 31. Indentation image acquisition camera; 4. Discharge port; 41. Receiving cylinder; 42. Pull plate; 43. Discharge electric rod; 44. Guide rod; 45. Mounting plate; 46. Adjustment electric rod; 47. Base; 48. Support bar; 49. Bracket; 5. Discharge cylinder 51. Push plate; 52. Receiving frame; 53. Restricting groove; 54. Restricting ring; 55. Electric feeding rod; 6. Bearing groove; 61. Through groove; 62. Guide rod; 63. Limiting piece; 64. Return spring; 7. Gear ring; 71. Ring groove; 72. Drive gear; 8. Buffer spring; 81. Pressure control plate; 82. One-way exhaust valve; 83. Vent pipe; 84. Cover; 9. Embedded groove; 91. Sealing plate. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Example 1: Please refer to Figures 1-8 A surface hardness testing device for metal materials includes a machine base 1, a lifting seat 11, a testing head 12, and a controller 13 disposed on the machine base 1. During operation, the controller 13 controls the lifting seat 11 to move upward, thereby moving the testing block to the testing head 12. Then, the testing head 12 applies pressure to the testing block to perform hardness testing.

[0024] A ring seat 2 is installed on the outside of the machine base 1. A bearing plate 21 is rotatably mounted on the ring seat 2. The upper surface of the bearing plate 21 is flush with the upper surface of the ring seat 2. Eight pressure seats 22 are equidistantly mounted on the bearing plate 21. An auxiliary detection unit is set between the pressure seats 22 and the bearing plate 21. A drive unit is set on the outside of the ring seat 2. The drive unit drives the ring seat 2 to rotate intermittently, and the single rotation angle is 45°. The machine base 1 is provided with a mounting base 3, a feeding mechanism and a feeding mechanism in sequence along the rotation direction of the bearing plate 21. The feeding mechanism is located on the side adjacent to the detection pressure head 12. An indentation image acquisition camera 31 is installed below the mounting base 3. The indentation image acquisition camera 31 is electrically connected to the controller 13. After the indentation image is acquired, the controller 13 controls the indentation image acquisition camera 31 to upload the acquired image information.

[0025] It should be added that the indentation image acquisition camera 31 integrates an electrically operated autofocus lens with a focal length of 5-50mm. It is controlled by the controller 13 through pulse signals and works with the laser rangefinder to measure the height of the sample's upper surface in real time. The controller 13 automatically calculates and sets the lens focal length to ensure clear imaging of samples of different thicknesses and slight tilts, and to ensure sharp indentation edges. In addition, a ring-shaped coaxial LED light source is installed below the lens and arranged coaxially. It adopts ring-shaped uniform illumination with continuously adjustable brightness from 0-100%, which can eliminate shadows and uneven reflections around the indentation, improve the contrast of the indentation contour, and ensure stable edge recognition.

[0026] The feeding mechanism includes a feeding port 4 opened on the ring seat 2, a receiving cylinder 41 corresponding to the feeding port 4 installed below the ring seat 2, a number of detection blocks placed inside the receiving cylinder 41, and a pull plate 42 corresponding to the bearing plate 21 installed on the surface of the machine base 1. The feeding mechanism includes a feeding cylinder 5 installed on the ring seat 2, and a pusher plate 51 corresponding to the bearing plate 21 is installed on the side of the machine base 1.

[0027] It should be noted that the detection pressure head 12, the indentation image acquisition camera 31, the receiving cylinder 41, and the unloading cylinder 5 are arranged in a rectangular shape above the bearing plate 21, so that the angle between any two adjacent structures is 90 degrees. Since there are eight bearing seats 22, non-working separation areas are reserved between any two adjacent ones of the detection pressure head 12, the indentation image acquisition camera 31, the receiving cylinder 41, and the unloading cylinder 5, so that the work of each working station does not interfere with each other.

[0028] During operation, the detection blocks are fed by the feeding mechanism. After each feeding, the drive unit drives the carrier plate 21 to rotate 45°. Then, the feeding mechanism continues to feed and repeats the feeding action. When the test block is conveyed by the carrier plate 21 to the position below the test head 12, the lifting seat 11 extends upward and drives the pressure seat 22 to move upward, so that the test block on the pressure seat 22 can move upward to the test head 12. Then, the test head 12 applies pressure to it to perform hardness testing. Since the pressure seat 22 moves upward, it will drive the guide rod 62 and the limiting plate 63 to move upward and compress the reset spring 64. Therefore, after the test is completed, the lifting seat 11 moves downward to reset. Under the action of the return force of the reset spring 64, the pressure seat 22 moves downward to reset. Then, the drive unit drives the carrier plate 21 to continue to rotate 45°, so that the untested test block moves to the test position again and repeats the previous test action. When the inspected block is transported to the underside of the indentation image acquisition camera 31, the indentation image acquisition camera 31 acquires indentation images on the inspected block and uploads the acquired image information; After image acquisition, the detection block continues to be conveyed forward. When it is conveyed to the unloading position, the unloading mechanism removes it, so that the hardness detection of the metal detection block can be carried out completely automatically.

[0029] In this embodiment, when processing the indentation image: Step 1: Image Acquisition and Preprocessing The camera captures RGB color images of the indentation area and converts them into grayscale images. A 5×5 Gaussian low-pass filter is used to suppress noise and preserve edges, avoiding false detection of contours caused by burrs.

[0030] Step 2: Indentation Edge Detection Canny edge detection algorithm is used: 1. Set the high-low threshold ratio to 2:1; 2. Output a binary edge map, retaining only the indentation outline and filtering out background interference.

[0031] Step 3: Indentation contour extraction and fitting Contour search is performed on the edge map to filter out contours whose area and aspect ratio conform to the Vickers indentation characteristics; the indentation approximates a rhomboid contour is obtained by least squares ellipse fitting; and then the edge positioning accuracy is improved to 0.1μm level by subpixel edge refinement to ensure the accuracy of size measurement.

[0032] Step 4: Calculate the diagonal dimensions For the fitted rhombus contour, the two diagonals are automatically identified: 2. Horizontal diagonal d1, vertical diagonal d2; 3. Calculate the average diagonal d = (d1 + d2) / 2; 4. Output precise numerical unit: μm, retain 2 decimal places.

[0033] 3. Hardness value calculation: How to obtain hardness from an image; According to GB / T4340.1-2009 "Vickers Hardness Test for Metallic Materials" standard, the hardness calculation formula is as follows: HV = 0.102 × F / S; in: F: Test force N, read and transmitted by the pressure head control system; S: Indentation surface area (mm) 2 S=d 2 / (2×sin(136° / 2)); d: Average diagonal length in mm.

[0034] The controller 13 automatically substitutes F and d into the calculation and outputs the Vickers hardness value HV, with the result retained to one decimal place. If the image is blurry, the outline is missing, or the size is outside the reasonable range, it will automatically prompt "Indentation recognition failed, please re-detect" to avoid invalid data.

[0035] Example 2: This example provides a technical solution based on the above examples: The auxiliary detection unit includes a bearing groove 6 equidistantly spaced in a circular shape on the bearing plate 21. The inner wall of the bearing groove 6 and the side of the bearing seat 22 are both smoothly formed. The bottom of the bearing groove 6 has a through groove 61 corresponding to the lifting seat 11. The pressure seat 22 is slidably connected inside the bearing groove 6, and the depth of the bearing groove 6 is consistent with the height of the pressure seat 22, which facilitates the loading and unloading of the detection block. Guide rods 62 are symmetrically slidably connected to both sides of the bottom surface of the bearing groove 6. The bottom end of the guide rod 62 penetrates the bottom of the bearing groove 6 and extends to the outside. The top of the guide rod 62 is fixedly connected to the pressure seat 22. A limiting piece 63 is fixedly connected to the bottom of the guide rod 62. A return spring 64 is fixedly connected between the limiting piece 63 and the bottom surface of the bearing plate 21. The return spring 64 is sleeved on the outside of the guide rod 62.

[0036] It should be noted that by guiding the movement of the pressure seat 22 through the guide rod 62, the lifting seat 11 moves upward and pushes the pressure seat 22 upward, resulting in better movement stability of the pressure seat 22. This ensures that the detection block placed on its surface will not shift in position, thus improving its detection stability.

[0037] Example 3: This example provides a technical solution based on the above examples: The drive unit includes a toothed ring 7 fixedly connected to the inner ring surface of the bearing disk 21. The side of the ring seat 2 is provided with an annular groove 71 corresponding to the toothed ring 7. A drive gear 72 is rotatably mounted on the inner side of the annular groove 71. The drive gear 72 is driven by a motor and meshes with the toothed ring 7.

[0038] It should be noted that the motor driving the drive gear 72 is electrically connected to the controller 13, which allows the controller 13 to precisely control the single rotation angle of the drive bearing plate 21, thereby effectively ensuring the stable operation of the detection work.

[0039] Example 4: This example provides a technical solution based on the above examples: The feeding mechanism further includes a receiving frame 52 installed on the surface of the ring seat 2. The receiving frame 52 is provided with a limiting groove 53. A limiting ring 54 is installed on the side of the unloading cylinder 5. The shape and specifications of the limiting ring 54 are adapted to the limiting groove 53. A feeding electric rod 55 is installed inside the machine base 1. The feeding electric rod 55 is electrically connected to the controller 13, so that the controller 13 can accurately control the pushing stroke distance of the feeding electric rod 55, thereby effectively ensuring the accuracy of the feeding position of the detection block. The push plate 51 is fixedly connected to the end of the telescopic end of the feeding electric rod 55, and the push plate 51 is slidably connected to the surface of the ring seat 2.

[0040] It should be noted that the distance between the bottom of the opening of the feeding cylinder 5 and the surface of the ring seat 2 is greater than the thickness of the detection block, and the thickness difference is 2mm. The thickness and length of the pusher plate 51 are consistent with the detection block, so that the detection block at the bottom of the feeding cylinder 5 can fall outside the feeding cylinder 5, so that the pusher plate 51 can smoothly push it to move onto the pressure seat 22.

[0041] It should be further explained that when the feeding electric rod 55 drives the pusher plate 51 to push the bottom detection block to the pressure seat 22, the upper surface of the pusher plate 51 contacts the upper detection block, so that the detection block in the feeding cylinder 5 will not fall during the pushing process of the pusher plate 51, thus allowing the pusher plate 51 to stably perform the reset action. After the pusher plate 51 is completely reset, the upper detection block separates from the pusher plate 51 and falls.

[0042] During feeding, the feeding electric rod 55 drives the pusher plate 51 to move, so that the pusher plate 51 pushes the detection block to the test position on the pressure seat 22. Then, the feeding electric rod 55 drives the pusher plate 51 to move in the opposite direction to reset. After that, the detection block in the unloading cylinder 5 continues to fall, and the feeding electric rod 55 continues to repeat the feeding action to feed.

[0043] Example 5: This example provides a technical solution based on the above examples: The feeding mechanism further includes a feeding electric rod 43 installed on the machine base 1. Guide rods 44 located on both sides of the feeding electric rod 43 are symmetrically slidably connected to the surface of the machine base 1. The guide rods 44 extend into the interior of the machine base 1 and are slidably connected to its inner wall. The ends of the two guide rods 44 are fixedly connected to the same mounting plate 45. An adjusting electric rod 46 is installed on the top of the mounting plate 45. A pull plate 42 is fixedly connected to the bottom of the telescopic end of the adjusting electric rod 46, and the pull plate 42 is slidably connected to the surface of the mounting plate 45.

[0044] It should be added that a base 47 is installed on the surface of the machine base 1, and symmetrically arranged support strips 48 are installed on the top of the side of the receiving cylinder 41. A bracket 49 that matches the support strips 48 is installed at the bottom of the ring seat 2. When the support strips 48 are embedded in the bracket 49, the bottom of the receiving cylinder 41 contacts the upper surface of the base 47, and the top of the receiving cylinder 41 contacts the bottom surface of the ring seat 2.

[0045] In addition, the shape and specifications of the discharge port 4 correspond to the detection block, so that the detection block can be stably discharged from the discharge port 4 after the detection is completed.

[0046] During the unloading operation, the electric lever 46 drives the pull plate 42 to move upward to the end of its upper stroke. Then, the unloading electric lever 43 drives the pull plate 42 to move to a position beyond the detection block and away from the unloading electric lever 43. Then, the electric lever 46 drives the pull plate 42 to move downward so that its bottom end moves downward past the top of the detection block. After that, the unloading electric lever 43 drives the pull plate 42 to slowly move in the opposite direction to reset. The movement of the pull plate 42 drives the detection block to move. When the detection block moves to the unloading port 4, the unloading electric lever 43 briefly stops driving. After the detection block falls from the unloading port 4, the pull plate 42 is driven to move and reset again. When the detection block needs to be unloaded again, the above unloading operation is repeated.

[0047] Example 6: This example provides a technical solution based on the above examples: A buffer spring 8 is installed at the bottom of the inner wall of the receiving cylinder 41, and a pressure control plate 81 is fixedly connected to the top of the buffer spring 8. The pressure control plate 81 is slidably connected to the inner wall of the receiving cylinder 41, and its shape and specifications are adapted to the inner wall of the receiving cylinder 41. A one-way exhaust valve 82 communicating with the inside of the receiving cylinder 41 is installed on the outer side of the receiving cylinder 41. The gas flow direction inside the one-way exhaust valve 82 is from the inside of the receiving cylinder 41 to the outside. A vent pipe 83 is fixedly connected to the outer surface of the receiving cylinder 41, and a cap 84 is threadedly connected to the end of the vent pipe 83.

[0048] It should be noted that when the detection block falls into the receiving cylinder 41, it is supported by the pressure control plate 81. At this time, under the impact force of the detection block, the buffer spring 8 is compressed, and the pressure control plate 81 moves deeper into the receiving cylinder 41, thereby effectively buffering the impact force of the detection block.

[0049] When the pressure plate 81 moves downward, it will compress the gas inside the receiving cylinder 41, causing the gas to be discharged from the one-way exhaust valve 82, so that the buffer spring 8 cannot be reset, thereby effectively ensuring the stability of the detection block receiving.

[0050] After the detection block inside the receiving cylinder 41 is removed, the operator can open the vent pipe 83 to allow external gas to enter the receiving cylinder 41 located below the pressure control plate 81, thereby balancing the internal air pressure, allowing the buffer spring 8 to slowly return to its original position, and driving the pressure control plate 81 to reset.

[0051] Example 7: This example provides a technical solution based on the above examples: an embedded groove 9 extending into the side of the feeding cylinder 5 near the cylinder opening is provided. A sealing plate 91 is slidably connected to the inner side of the embedded groove 9. The width of the embedded groove 9 is greater than the width of the inner wall of the feeding cylinder 5, so that when the feeding cylinder 5 is installed, the detection block inside it will not leak downwards, thereby effectively ensuring the stability of the installation of the feeding cylinder 5.

[0052] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A surface hardness testing device for metallic materials, comprising a machine base (1) and a lifting seat (11), a testing head (12), and a controller (13) disposed on the machine base (1), characterized in that, The machine base (1) is equipped with a ring seat (2) on the outside. A bearing plate (21) is rotatably mounted on the ring seat (2). The upper surface of the bearing plate (21) is flush with the upper surface of the ring seat (2). Eight pressure seats (22) are equidistantly mounted on the bearing plate (21). An auxiliary detection unit is provided between the pressure seats (22) and the bearing plate (21). A drive unit is provided on the outside of the ring seat (2). The drive unit drives the ring seat (2) to rotate intermittently, and the single rotation angle is 45°. The machine base (1) is provided with a mounting base (3), a feeding mechanism and a feeding mechanism in sequence along the rotation direction of the bearing plate (21) on the outside. The feeding mechanism is located on the side adjacent to the detection pressure head (12). An indentation image acquisition camera (31) is installed below the mounting base (3). The feeding mechanism includes a feeding port (4) opened on the ring seat (2). A receiving cylinder (41) corresponding to the feeding port (4) is installed below the ring seat (2). Several detection blocks are placed inside the receiving cylinder (41). A pull plate (42) corresponding to the bearing plate (21) is installed on the surface of the machine base (1). The feeding mechanism includes a feeding cylinder (5) installed on the ring seat (2). A push plate (51) corresponding to the bearing plate (21) is installed on the side of the machine base (1). The detection pressure head (12), the indentation image acquisition camera (31), the receiving cylinder (41), and the unloading cylinder (5) are arranged in a rectangular shape above the bearing plate (21).

2. The surface hardness testing device for metallic materials according to claim 1, characterized in that, The auxiliary detection unit includes a bearing groove (6) that is equidistantly arranged in a circular shape on the bearing plate (21). The bottom of the bearing groove (6) is provided with a through groove (61) corresponding to the lifting seat (11). The pressure seat (22) is slidably connected inside the bearing groove (6), and the depth of the bearing groove (6) is the same as the height of the pressure seat (22). Guide rods (62) are symmetrically slidably connected on both sides of the bottom surface of the bearing groove (6). The bottom end of the guide rod (62) penetrates the bottom of the bearing groove (6) and extends to the outside. The top of the guide rod (62) is fixedly connected to the pressure seat (22). The bottom of the guide rod (62) is fixedly connected to a limiting piece (63). A return spring (64) is fixedly connected between the limiting piece (63) and the bottom surface of the bearing plate (21). The return spring (64) is sleeved on the outside of the guide rod (62).

3. The surface hardness testing device for metallic materials according to claim 2, characterized in that, The drive unit includes a toothed ring (7) fixedly connected to the inner ring surface of the bearing disk (21). The side of the ring seat (2) is provided with an annular groove (71) corresponding to the toothed ring (7). A drive gear (72) is rotatably mounted on the inner side of the annular groove (71). The drive gear (72) is driven by a motor and meshes with the toothed ring (7).

4. The surface hardness testing device for metallic materials according to claim 3, characterized in that, The feeding mechanism also includes a receiving frame (52) installed on the surface of the ring seat (2). The receiving frame (52) is provided with a limiting groove (53). A limiting ring (54) is installed on the side of the feeding cylinder (5). The shape and specifications of the limiting ring (54) are adapted to the limiting groove (53). The machine base (1) is equipped with a feeding electric rod (55). The pusher plate (51) is fixedly connected to the end of the extension end of the feeding electric rod (55), and the pusher plate (51) is slidably connected to the surface of the ring seat (2).

5. The surface hardness testing device for metallic materials according to claim 4, characterized in that, The distance between the bottom of the feed cylinder (5) and the surface of the ring seat (2) is greater than the thickness of the detection block, and the thickness difference is 2mm. The thickness and length of the pusher plate (51) are consistent with those of the detection block.

6. The surface hardness testing device for metallic materials according to claim 5, characterized in that, The feeding mechanism also includes a feeding electric rod (43) installed on the machine base (1). The surface of the machine base (1) is symmetrically slidably connected with guide rods (44) located on both sides of the feeding electric rod (43). The guide rods (44) extend into the machine base (1) and are slidably connected to its inner wall. The ends of the two guide rods (44) are fixedly connected to the same mounting plate (45). An adjusting electric rod (46) is installed on the top of the mounting plate (45). The pull plate (42) is fixedly connected to the bottom of the telescopic end of the adjusting electric rod (46), and the pull plate (42) is slidably connected to the surface of the mounting plate (45).

7. The surface hardness testing device for metallic materials according to claim 6, characterized in that, The machine base (1) is equipped with a base (47), and the top of the side of the receiving cylinder (41) is equipped with symmetrically arranged support strips (48). The bottom of the ring seat (2) is equipped with a bracket (49) that matches the support strips (48). When the support strips (48) are embedded in the bracket (49), the bottom of the receiving cylinder (41) contacts the upper surface of the base (47), and the top of the receiving cylinder (41) contacts the bottom surface of the ring seat (2).

8. The surface hardness testing device for metallic materials according to claim 7, characterized in that, The shape and specifications of the discharge port (4) correspond to those of the detection block.

9. The surface hardness testing device for metallic materials according to claim 8, characterized in that, A buffer spring (8) is installed at the bottom of the inner wall of the receiving cylinder (41). A pressure control plate (81) is fixedly connected to the top of the buffer spring (8). The pressure control plate (81) is slidably connected to the inner wall of the receiving cylinder (41), and its shape and specifications are adapted to the inner wall of the receiving cylinder (41). A one-way exhaust valve (82) is installed on the outer side of the receiving cylinder (41) and connects to its interior. The gas flow direction inside the one-way exhaust valve (82) is from the inside of the receiving cylinder (41) to the outside. A vent pipe (83) is fixedly connected to the outer surface of the receiving cylinder (41), and a cap (84) is threadedly connected to the end of the vent pipe (83).

10. A surface hardness testing device for metallic materials according to claim 9, characterized in that, The feed cylinder (5) has an embedded groove (9) extending into its interior near the cylinder opening on its side. A sealing plate (91) is slidably connected to the inner side of the embedded groove (9). The width of the embedded groove (9) is greater than the width of the inner wall of the feed cylinder (5).

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