Full-automatic standard brinell hardness tester and its shifting method

Abstract

The application provides a full-automatic standard Brinell hardness tester and a displacement method thereof. The full-automatic standard Brinell hardness tester comprises a seat body, a pressure bearing platform mechanism, a pressing device and an indentation detection device. The pressure bearing platform mechanism comprises a horizontal bottom plate, a pressure bearing block, a left-right displacement mechanism and a front-rear displacement mechanism, and the bottom surface of the pressure bearing block is directly in contact with the upper surface of the horizontal bottom plate. According to the technical scheme, the pressure bearing block for placing a to-be-pressed part is directly in contact with the horizontal bottom plate, the displacement of the pressure bearing block is achieved by using the left-right displacement mechanism and the front-rear displacement mechanism which are designed separately from the pressure bearing block and are pushed from the side, the displacement mechanism does not interfere with the pressure bearing block during the pressing process, a hard contact system is formed below the to-be-pressed part, the stable pressing of the pressing device on the to-be-pressed part is ensured, and the accuracy of hardness determination is improved. According to the displacement mode of first displacement and then return, the pressing position of the to-be-pressed part can be accurately displaced to the target position automatically, so that the accuracy of indentation parameter detection is improved.

Description

Technical Field

[0001] This invention relates to the field of hardness measurement technology, specifically providing a fully automatic standard Brinell hardness tester and its displacement method. Background Technology

[0002] Hardness testing is the simplest and fastest method for testing the mechanical properties of materials. It is one of the main methods for determining the mechanical properties of materials, inspecting product quality, and determining reasonable heat treatment specifications and machining processes. The standard Brinell hardness tester, as a metrological reference device, plays a crucial role in reproducing and preserving the values ​​of measurement units. Its reliability is of particular significance to the stable metrological performance required of the reference device.

[0003] With the development of automation technology, automated displacement and machine vision technologies have emerged, which automatically collect indentation images and analyze them to obtain hardness value data.

[0004] A standard Brinell hardness tester is disclosed in patent document CN109900585A, as shown in the document. Figure 7 As described in section

[0017] of the instruction manual, the workpiece placement stage 6 includes a left-right moving stage 27 and a front-back moving stage 25. Item 29 in the figure represents the first guide rail for guiding the left-right moving stage, which is fixed to the base. Item 26 represents the second guide rail for guiding the front-back moving stage, which is fixed to the left-right moving stage. The function of the first and second guide rails is to improve the smoothness of movement. The presence of the first and second guide rails results in a vertical clearance between the workpiece placement stage and the base. This clearance causes the pressure-bearing platform formed below the workpiece placement stage to be a non-hard contact platform. After the upper indenter of the hardness tester applies pressure, as the pressure increases, the pressure-bearing platform itself may shift downwards, affecting the size of the indentation formed on the workpiece and thus the accuracy of the hardness value measurement. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a fully automatic standard Brinell hardness tester and its displacement method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is: a fully automatic standard Brinell hardness tester, comprising:

[0007] seat body;

[0008] A pressure-bearing platform mechanism includes a horizontal base plate, a pressure block, a left-right shifting mechanism, and a front-back shifting mechanism. The horizontal base plate is horizontally fixed to the base body. The pressure block is placed on the upper surface of the horizontal base plate, and the bottom surface of the pressure block directly contacts the upper surface of the horizontal base plate. The left-right shifting mechanism includes a left-right pushing frame and a first lead screw drive mechanism. The first lead screw drive mechanism is mounted on the base body and drives the left-right pushing frame to translate in the left-right direction. The left-right pushing frame has a left inner wall surface located to the left of the pressure block and a front-back shifting mechanism located to the right of the pressure block. The right inner wall surface on the right side of the pressure block, the distance between the left inner wall surface and the right inner wall surface is greater than the width between the left and right sides of the pressure block; the forward and backward displacement mechanism includes a forward and backward pushing frame and a second lead screw drive mechanism, the second lead screw drive mechanism is installed on the left and right pushing frames, the second lead screw drive mechanism drives the forward and backward pushing frame to translate in the forward and backward direction, the forward and backward pushing frame has a front inner wall surface located on the front side of the pressure block and a rear inner wall surface located on the rear side of the pressure block, the distance between the front inner wall surface and the rear inner wall surface is greater than the width between the front side and the rear side of the pressure block;

[0009] The base is equipped with a pressurizing station and an indentation detection station. The pressurizing station is equipped with a pressurizing device, which includes a first bracket, a force-applying mechanism, a force sensor, and a standard indenter. The first bracket is mounted on the base and spans the horizontal base plate from front to back. The force-applying mechanism is mounted on the first bracket, and the force sensor is connected between the force-applying end of the force-applying mechanism and the standard indenter. The indentation detection station is equipped with an indentation detection device, which includes a second bracket, a lifting mechanism, and a camera. The second bracket is mounted on the base and spans the horizontal base plate from front to back. The lifting mechanism is mounted on the second bracket and drives the camera to move up and down.

[0010] The left-right shifting mechanism and the front-back shifting mechanism drive the pressure block to slide on the surface of the horizontal base plate, so as to realize the displacement of the part to be pressed on the pressure block between the pressure station and the indentation detection station.

[0011] Using the technical solution of this invention, the pressure block used to place the workpiece to be pressed is in direct contact with the horizontal base plate. The displacement of the pressure block is achieved by a left-right displacement mechanism and a front-back displacement mechanism designed separately from it, which push it from the side. During the pressurization process, the displacement mechanism does not interfere with the pressure block, and a hard contact system is formed below the workpiece to be pressed, ensuring that the upper pressurization device applies pressure to the workpiece smoothly and improving the accuracy of hardness measurement.

[0012] Furthermore, if the distance between the left inner wall and the right inner wall of the left and right sliding frames is A1, and the width between the left and right sides of the pressure block is A2, then the gap between the left and right sliding frames and the pressure block in the left and right directions is Δa = A1 - A2, and Δa > 0.2 mm.

[0013] Furthermore, with B1 as the distance between the front inner wall and the rear inner wall of the front and rear sliding frames, and B2 as the width between the front and rear sides of the pressure block, the gap Δb between the front and rear sliding frames and the pressure block in the front-rear direction is B1-B2, and Δb>0.2mm.

[0014] By adopting the above-mentioned preferred scheme, sufficient clearance is ensured between the displacement mechanism and the pressure block.

[0015] Furthermore, the left and right sliding frame is provided with a first laser ranging sensor assembly for detecting the distance between the left inner wall of the left sliding frame and the left side of the pressure block or the distance between the right inner wall of the left and right sliding frame and the right side of the pressure block. The first laser ranging sensor assembly includes three laser ranging sensors whose positions are distributed in a triangular pattern.

[0016] Furthermore, the front and rear pushing frame is provided with a second laser ranging sensor assembly for detecting the distance between the front inner wall surface of the front and rear pushing frame and the front side surface of the pressure block or the distance between the rear inner wall surface of the front and rear pushing frame and the rear side surface of the pressure block. The second laser ranging sensor assembly includes three laser ranging sensors whose positions are distributed in a triangular vertices.

[0017] By adopting the above-mentioned preferred scheme, the distance between the three points detected by the laser rangefinder and the side is compared to detect whether the position of the pressure block has been deviated, thus ensuring the accuracy of the indentation position.

[0018] Furthermore, the part to be pressed on the pressure block is in the shape of a disc, and a V-shaped abutment is fixed on the top surface of the pressure block, with the outer circumferential surface of the part to be pressed resting against the V-shaped opening of the V-shaped abutment.

[0019] Furthermore, the pressure block is also provided with a pushing mechanism, which includes a push plate, a slide rail, a slide rail seat, a compression spring, a support plate, and a top pushing force mechanism. The top pushing force mechanism is installed opposite the V-shaped opening of the V-shaped block, and the extension direction of the top pushing force mechanism is along the centerline of the V-shaped opening of the V-shaped block. The support plate is installed at the top end of the extension rod of the top pushing force mechanism. The slide rail seat is axially movable on the support plate via a guide shaft. The two ends of the compression spring abut against the support plate and the slide rail seat respectively. The push plate is installed on the slide rail seat via the slide rail, and the push plate can translate relative to the slide rail seat in a direction perpendicular to the pushing direction.

[0020] By adopting the above-mentioned preferred scheme, the accuracy of the placement of the component to be pressed on the pressure block is improved.

[0021] The displacement method of the fully automatic standard Brinell hardness tester establishes a two-dimensional coordinate system with the left-right displacement mechanism moving direction as the X-axis and the front-back displacement mechanism moving direction as the Y-axis. The projection of the center of the indentation detection device camera onto the Z-axis of the two-dimensional coordinate system is taken as the zero point (X0, Y0), and the projection of the center of the pressure head of the pressure device onto the Z-axis of the two-dimensional coordinate system is (Xm, Y0), where X0 = 0mm and Y0 = 0mm.

[0022] After the component to be pressed is placed in the position of the pressure block, when the pressure application position on the component is: a distance of A3 in the X direction from the left side of the pressure block and a distance of B3 in the Y direction from the rear side of the pressure block,

[0023] The shifting method includes the following steps:

[0024] Step 1: The left and right push frames are moved to position X1 in the X-axis by the left and right displacement mechanism. The position X1 refers to the coordinate value of the left inner wall of the left and right push frames in the X-axis. X1 = Xm - A3 - Δa - Sx, where Sx is the reserved displacement value in the X-axis, Sx is the set value, and Sx > 0mm.

[0025] Step 2: Continue to move the left and right push frame to the right along the X-axis by a distance of Δa+Sx through the left and right displacement mechanism. At this time, the X coordinate value of the pressure position on the workpiece is Xm.

[0026] Step 3: Then, the front and rear push frames are moved to position Y1 along the Y-axis by the front and rear displacement mechanism. The position Y1 refers to the coordinate value of the rear inner wall surface of the front and rear push frames in the Y-axis. Y1 = Y0 - B3 - Δb - Sy, where Sy is the reserved displacement value in the Y-axis, Sy is the set value, and Sy > 0 mm.

[0027] Step 4: Continue to move the front and rear push frames forward by a distance Δb+Sy along the Y-axis through the forward and backward displacement mechanism. At this time, the Y coordinate value of the pressure position on the workpiece is Y0.

[0028] Step 5: Apply pressure to the workpiece using a pressure device to form an indentation;

[0029] Step 6: The left and right push frames are moved to the left along the X-axis to position X2 by the left and right displacement mechanism. The X2 position refers to the coordinate value of the left inner wall of the left and right push frames in the X-axis, X2 = X0 - A3 - Δa - Sx, where Sx is the reserved displacement value in the X direction, Sx is the set value, and Sx > 0mm.

[0030] Step 7: Continue to move the left and right push frame to the right by a distance of Δa+Sx along the X-axis through the left and right displacement mechanism. At this time, the X coordinate value of the indentation position on the workpiece to be pressed is X0.

[0031] Step 8: Then, the front and rear push frames are moved to position Y1 along the Y-axis by the front and rear shifting mechanism. The position Y1 refers to the coordinate value of the rear inner wall surface of the front and rear push frames in the Y-axis. Y1 = Y0 - B3 - Δb - Sy, where Sy is the reserved shift value in the Y-axis, Sy is the set value, and Sy > 0 mm.

[0032] Step 9: Continue to move the front and rear push frame forward by a distance Δb+Sy along the Y-axis through the front and rear shifting mechanism. At this time, the Y coordinate value of the pressure position on the workpiece is Y0.

[0033] Step 10: Collect and analyze indentation parameters using an indentation detection device.

[0034] When there is a gap between the pressure block and the displacement mechanism, the above displacement method, by moving through the position and then returning, can ensure that the pressure position of the part to be pressed is accurately moved to the target position, thereby improving the accuracy of the indentation parameter detection.

[0035] Furthermore, step 4 also includes: using a first laser ranging sensor combination to detect whether the distance between the left inner wall of the left and right sliding frame and the left side of the pressure block is within a set value range; using a second laser ranging sensor combination to detect whether the distance between the rear inner wall of the front and rear sliding frame and the rear side of the pressure block is within a set value range; if the distance exceeds the set value range, then repeat steps 1-4; if the distance exceeds the set value range again, then issue an alarm.

[0036] Furthermore, step 9 also includes: using a first laser ranging sensor combination to detect whether the distance between the left inner wall of the left and right sliding frame and the left side of the pressure block is within a set value range; using a second laser ranging sensor combination to detect whether the distance between the rear inner wall of the front and rear sliding frame and the rear side of the pressure block is within a set value range; if the distance exceeds the set value range, then repeat steps 6-9; if the distance exceeds the set value range again, then issue an alarm.

[0037] By adopting the above-mentioned preferred scheme, the distances between the three points detected by the laser rangefinder and the side are compared to detect whether the pressure block has deviated when it moves to the target position, thus ensuring the accuracy of the indentation position. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of the fully automatic standard Brinell hardness tester of this invention.

[0040] Figure 2 This is a three-dimensional structural diagram of the pressure-bearing platform mechanism of the present invention.

[0041] Figure 3 This is a top view of the pressure-bearing platform mechanism of the present invention.

[0042] Figure 4 This is a schematic diagram of another embodiment of the pressure-bearing block of the present invention.

[0043] Figure 5-8 This is a schematic diagram illustrating the process of shifting the device to the pressure position according to the present invention.

[0044] Figure 9-12 This is a schematic diagram illustrating the process of shifting the sensor to the detection position according to the present invention.

[0045] The numbers and letters in the diagram represent the names of the corresponding components:

[0046] 10-Seat body; 20-Pressure-bearing platform mechanism; 21-Horizontal base plate; 22-Pressure-bearing block; 23-Left and right pushing frame; 24-First lead screw drive mechanism; 25-Front and rear pushing frame; 26-Second lead screw drive mechanism; 27-Place to be pressed; 28-V-shaped support block; 29-Pushing mechanism; 291-Push plate; 293-Slide rail seat; 294-Compression spring; 295-Support plate; 296-Top pushing force mechanism; 30-Pressure device; 31-First bracket; 32-Force application mechanism; 33-Force sensor; 34-Standard pressure head; 40-Indentation detection device; 41-Second bracket; 42-Lifting mechanism; 43-Camera. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] like Figure 1-3 As shown, one embodiment of the present invention is: a fully automatic standard Brinell hardness tester, comprising:

[0049] base 10;

[0050] The pressure-bearing platform mechanism 20 includes a horizontal base plate 21, a pressure block 22, a left-right shifting mechanism, and a front-back shifting mechanism. The horizontal base plate 21 is horizontally fixed on the base 10. The pressure block 22 is placed on the upper surface of the horizontal base plate 21, and the bottom surface of the pressure block 22 directly contacts the upper surface of the horizontal base plate 21. The left-right shifting mechanism includes a left-right pushing frame 23 and a first lead screw drive mechanism 24. The first lead screw drive mechanism 24 is mounted on the base 10 and drives the left-right pushing frame 23 to move horizontally in the left-right direction. The left-right pushing frame 23 has a left inner wall surface located on the left side of the pressure block and a front-back shifting mechanism located on the left side of the pressure block. The distance A1 between the right inner wall surface and the left inner wall surface of the right side of the block is greater than the width A2 between the left and right sides of the pressure block 22; the forward and backward displacement mechanism includes a forward and backward pushing frame 25 and a second lead screw drive mechanism 26. The second lead screw drive mechanism 26 is installed on the left and right pushing frames 23. The second lead screw drive mechanism 26 drives the forward and backward pushing frame 23 to translate in the forward and backward direction. The forward and backward pushing frame 23 has a front inner wall surface located in front of the pressure block and a rear inner wall surface located behind the pressure block. The distance B1 between the front inner wall surface and the rear inner wall surface is greater than the width B2 between the front side and the rear side of the pressure block 22;

[0051] The base 10 is equipped with a pressure station and an indentation detection station. The pressure station is equipped with a pressure device 30, which includes a first support 31, a force application mechanism 32, a force sensor 33, and a standard indenter 34. The first support 31 is mounted on the base 10 and spans the horizontal base plate 21. The force application mechanism 32 is mounted on the first support 31. The force sensor 33 is connected between the force application end of the force application mechanism 32 and the standard indenter 34. The indentation detection station is equipped with an indentation detection device 40, which includes a second support 41, a lifting mechanism 42, and a camera 43. The second support 41 is mounted on the base 10 and spans the horizontal base plate 21. The lifting mechanism 42 is mounted on the second support 41 and drives the camera 43 to move up and down.

[0052] The left-right shifting mechanism and the front-back shifting mechanism drive the pressure block 22 to slide on the surface of the horizontal base plate 21, so as to realize the displacement of the pressure piece 27 on the pressure block 22 between the pressure station and the indentation detection station.

[0053] The beneficial effects of adopting the above technical solution are: the pressure block used to place the part to be pressed is in direct contact with the horizontal base plate, and the displacement of the pressure block is achieved by a left-right displacement mechanism and a front-back displacement mechanism designed separately from it, which push it from the side. During the pressurization process, the displacement mechanism does not interfere with the pressure block, and a hard contact system is formed under the part to be pressed, which ensures that the upper pressurization device applies pressure to the part to be pressed smoothly and improves the accuracy of hardness measurement.

[0054] like Figure 3 As shown, in some other embodiments of the present invention, the distance between the left inner wall and the right inner wall of the left and right sliding frame 23 is A1, and the width between the left side and the right side of the pressure block 22 is A2. Then the gap Δa between the left and right sliding frame 23 and the pressure block 22 in the left and right direction is A1-A2, and Δa>0.2mm.

[0055] like Figure 3 As shown, in some other embodiments of the present invention, the distance between the front inner wall and the rear inner wall of the front and rear pushing frame 25 is B1, and the width between the front side and the rear side of the pressure block 22 is B2. Then, the gap Δb between the front and rear pushing frame 25 and the pressure block 22 in the front-rear direction is Δb = B1 - B2, and Δb > 0.2 mm. This ensures sufficient clearance between the shifting mechanism and the pressure block.

[0056] In other embodiments of the present invention, the left and right sliding frame 23 is provided with a first laser ranging sensor assembly for detecting the distance between the left inner wall surface of the left sliding frame and the left side surface of the pressure block. The first laser ranging sensor assembly includes three laser ranging sensors whose positions are distributed at the vertices of a triangle. The front and rear sliding frame 25 is provided with a second laser ranging sensor assembly for detecting the distance between the rear inner wall surface of the front and rear sliding frame and the rear side surface of the pressure block. The second laser ranging sensor assembly includes three laser ranging sensors whose positions are distributed at the vertices of a triangle. The beneficial effect of adopting the above technical solution is that by comparing the distances of the three points detected by the laser ranging sensors with the side surface, the position of the pressure block can be detected to see if there is any deviation, ensuring the accuracy of the indentation position.

[0057] like Figure 4 As shown, in some other embodiments of the present invention, the part to be pressed on the pressure block 22 is in the shape of a disc, and a V-shaped abutment block 28 is fixed on the top surface of the pressure block 22, and the outer circumferential surface of the part to be pressed 27 abuts against the V-shaped opening of the V-shaped abutment block 28.

[0058] like Figure 4As shown, in some other embodiments of the present invention, the pressure block 22 is further provided with a pushing mechanism 29. The pushing mechanism 29 includes a push plate 291, a slide rail, a slide rail seat 293, a compression spring 294, a support plate 295, and a pushing force mechanism 296. The pushing force mechanism 296 is installed opposite the V-shaped opening of the V-shaped block 28, and the extension direction of the pushing force mechanism 296 is along the centerline of the V-shaped opening of the V-shaped block 28. The support plate 295 is installed at the top end of the extension rod of the pushing force mechanism 296. The slide rail seat 293 is installed on the support plate 295 via a guide shaft. The two ends of the compression spring 294 abut against the support plate 295 and the slide rail seat 293 respectively. The push plate 291 is installed on the slide rail seat 293 via the slide rail, and the push plate 291 can translate relative to the slide rail seat 293 in a direction perpendicular to the pushing direction. The beneficial effect of adopting the above technical solution is to improve the accuracy of the placement of the part to be pressed on the pressure block.

[0059] like Figure 5-12 As shown, the displacement method of the fully automatic standard Brinell hardness tester establishes a two-dimensional coordinate system with the left-right displacement mechanism moving direction as the X-axis and the front-back displacement mechanism moving direction as the Y-axis. The zero point K1 (X0, Y0) is the projection of the center of the indentation detection device camera 43 onto the Z-axis of the two-dimensional coordinate system, and the projection of the center of the pressure head of the pressure device onto the Z-axis of the two-dimensional coordinate system is K2 (Xm, Y0), where X0 = 0mm and Y0 = 0mm.

[0060] After the component to be pressed is placed in the position of the pressure block, taking the pressure application position K2 on the component to be pressed as follows: the X-direction distance from the left side of the pressure block is A3, and the Y-direction distance from the rear side of the pressure block is B3, as an example.

[0061] The shifting method includes the following steps:

[0062] Step 1: The left and right shifting mechanism moves the left and right pushing frame along the X-axis to position X1, as shown below. Figure 5 As shown, the X1 position refers to the coordinate value of the left inner wall of the left and right push frame in the X-axis direction as X1, X1=Xm-A3-Δa-Sx, where Sx is the reserved displacement value in the X direction, Sx is the set value, and Sx>0mm;

[0063] Step 2, continue to use the left-right shifting mechanism to move the left and right pusher frames to the right along the X-axis by a distance Δa+Sx, as shown below. Figure 6 As shown in the figure, the X coordinate value of the pressure application position K3 on the part to be pressed is Xm;

[0064] Step 3, then the forward and backward shifting mechanism drives the forward and backward pushing frame to move along the Y-axis to position Y1, as shown. Figure 7As shown, the Y1 position refers to the coordinate value of the inner rear wall of the front and rear push frame in the Y-axis direction as Y1, Y1=Y0-B3-Δb-Sy, where Sy is the reserved displacement value in the Y direction, Sy is the set value, Sy>0mm;

[0065] Step 4: Continue to use the forward and backward shifting mechanism to move the forward and backward pushing frame forward along the Y-axis by a distance Δb+Sy, as shown below. Figure 8 As shown in the figure, the Y-coordinate value of the pressure position K3 on the part to be pressed is Y0.

[0066] Step 5: Apply pressure to the workpiece using a pressure device to form an indentation;

[0067] Step 6: The left and right shifting mechanism drives the left and right pushing frame to move to the left along the X-axis to position X2, as shown. Figure 9 As shown, the X2 position refers to the coordinate value of the left inner wall of the left and right push frame in the X-axis direction as X2, X2=X0-A3-Δa-Sx, where Sx is the reserved displacement value in the X direction, Sx is the set value, and Sx>0mm;

[0068] Step 7: Continue to use the left-right shifting mechanism to move the left and right pusher frame to the right along the X-axis by a distance Δa+Sx, as shown below. Figure 10 As shown in the figure, the X coordinate value of the indentation position K3 on the workpiece to be pressed is X0.

[0069] Step 8: Then, the forward and backward shifting mechanism moves the forward and backward pushing frame along the Y-axis to position Y1, as shown. Figure 11 As shown, the Y1 position refers to the coordinate value of the inner rear wall of the front and rear push frame in the Y-axis direction as Y1, Y1=Y0-B3-Δb-Sy, where Sy is the reserved displacement value in the Y direction, Sy is the set value, Sy>0mm;

[0070] Step 9: Continue to move the forward and backward pushing frame forward along the Y-axis by a distance Δb+Sy using the forward and backward shifting mechanism, as shown below. Figure 12 As shown in the figure, at this time, the Y coordinate value of the indentation position K3 on the workpiece to be pressed is Y0;

[0071] Step 10: Collect and analyze indentation parameters using an indentation detection device.

[0072] When there is a gap between the pressure block and the displacement mechanism, the above displacement method, by moving through the position and then returning, can ensure that the pressure position of the part to be pressed is accurately moved to the target position, thereby improving the accuracy of the indentation parameter detection.

[0073] In some other embodiments of the present invention, step 4 further includes: using a first laser ranging sensor combination to detect whether the distance between the left inner wall of the left and right sliding frame and the left side of the pressure block is within a set value range; using a second laser ranging sensor combination to detect whether the distance between the rear inner wall of the front and rear sliding frame and the rear side of the pressure block is within a set value range; if the distance exceeds the set value range, then steps 1-4 are repeated; if the distance exceeds the set value range again, then an alarm is issued.

[0074] In some embodiments of the present invention, step 9 further includes: using a first laser rangefinder sensor combination to detect whether the distance between the left inner wall of the left and right pushing frames and the left side of the pressure block is within a set value range; using a second laser rangefinder sensor combination to detect whether the distance between the rear inner wall of the front and rear pushing frames and the rear side of the pressure block is within a set value range; if the distance exceeds the set value range, steps 6-9 are repeated; if the distance exceeds the set value range again, an alarm is issued. By comparing the distances of the three points detected by the laser rangefinder sensors with the side, the accuracy of the pressure block's position when it moves to the target position is ensured, thus detecting whether the pressure block has deviated from its original position.

[0075] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. Fully automatic standard Brinell hardness tester, including: seat body; A pressure-bearing platform mechanism includes a horizontal base plate, a pressure block, a left-right shifting mechanism, and a front-back shifting mechanism. The horizontal base plate is horizontally fixed to the base body. The pressure block is placed on the upper surface of the horizontal base plate, and the bottom surface of the pressure block directly contacts the upper surface of the horizontal base plate. The left-right shifting mechanism includes a left-right pushing frame and a first lead screw drive mechanism. The first lead screw drive mechanism is mounted on the base body and drives the left-right pushing frame to translate in the left-right direction. The left-right pushing frame has a left inner wall surface located to the left of the pressure block and a front-back shifting mechanism located to the right of the pressure block. The right inner wall surface on the right side of the pressure block, the distance between the left inner wall surface and the right inner wall surface is greater than the width between the left and right sides of the pressure block; the forward and backward displacement mechanism includes a forward and backward pushing frame and a second lead screw drive mechanism, the second lead screw drive mechanism is installed on the left and right pushing frames, the second lead screw drive mechanism drives the forward and backward pushing frame to translate in the forward and backward direction, the forward and backward pushing frame has a front inner wall surface located on the front side of the pressure block and a rear inner wall surface located on the rear side of the pressure block, the distance between the front inner wall surface and the rear inner wall surface is greater than the width between the front side and the rear side of the pressure block; The base is equipped with a pressurizing station and an indentation detection station. The pressurizing station is equipped with a pressurizing device, which includes a first bracket, a force-applying mechanism, a force sensor, and a standard indenter. The first bracket is mounted on the base and spans the horizontal base plate from front to back. The force-applying mechanism is mounted on the first bracket, and the force sensor is connected between the force-applying end of the force-applying mechanism and the standard indenter. The indentation detection station is equipped with an indentation detection device, which includes a second bracket, a lifting mechanism, and a camera. The second bracket is mounted on the base and spans the horizontal base plate from front to back. The lifting mechanism is mounted on the second bracket and drives the camera to move up and down. The left-right shifting mechanism and the front-back shifting mechanism drive the pressure block to slide on the surface of the horizontal base plate, so as to realize the displacement of the part to be pressed on the pressure block between the pressure station and the indentation detection station.

2. The fully automatic standard Brinell hardness tester according to claim 1, characterized in that, Let A1 be the distance between the left and right inner walls of the left and right sliding frames, and A2 be the width between the left and right sides of the pressure block. Then, the gap between the left and right sliding frames and the pressure block in the left and right directions is Δa = A1 - A2, and Δa > 0.2 mm.

3. The fully automatic standard Brinell hardness tester according to claim 2, characterized in that, With B1 as the distance between the front inner wall and the rear inner wall of the front and rear sliding frame, and B2 as the width between the front and rear sides of the pressure block, the gap Δb between the front and rear sliding frame and the pressure block in the front-rear direction is B1-B2, and Δb>0.2mm.

4. The fully automatic standard Brinell hardness tester according to claim 1, characterized in that, The left and right sliding frame is provided with a first laser ranging sensor assembly for detecting the distance between the left inner wall of the left sliding frame and the left side of the pressure block or the distance between the right inner wall of the left and right sliding frame and the right side of the pressure block. The first laser ranging sensor assembly includes three laser ranging sensors whose positions are distributed in a triangle.

5. The fully automatic standard Brinell hardness tester according to claim 4, characterized in that, The front and rear pushing frame is provided with a second laser ranging sensor assembly for detecting the distance between the front inner wall surface of the front and rear pushing frame and the front side surface of the pressure block or the distance between the rear inner wall surface of the front and rear pushing frame and the rear side surface of the pressure block. The second laser ranging sensor assembly includes three laser ranging sensors whose positions are distributed in a triangular vertices.

6. The fully automatic standard Brinell hardness tester according to claim 5, characterized in that, The part to be pressed on the pressure block is in the shape of a disc. A V-shaped abutment is fixed on the top surface of the pressure block, and the outer circumferential surface of the part to be pressed rests against the V-shaped opening of the V-shaped abutment.

7. The fully automatic standard Brinell hardness tester according to claim 6, characterized in that, The pressure block is also provided with a pushing mechanism, which includes a push plate, a slide rail, a slide rail seat, a compression spring, a support plate, and a top pushing force mechanism. The top pushing force mechanism is installed opposite the V-shaped opening of the V-shaped block, and the extension direction of the top pushing force mechanism is along the center line of the V-shaped opening of the V-shaped block. The support plate is installed at the top end of the extension rod of the top pushing force mechanism. The slide rail seat is axially movable on the support plate via a guide shaft. The two ends of the compression spring abut against the support plate and the slide rail seat respectively. The push plate is installed on the slide rail seat via the slide rail, and the push plate can translate relative to the slide rail seat in a direction perpendicular to the pushing direction.

8. A shifting method for a fully automatic standard Brinell hardness tester, based on the fully automatic standard Brinell hardness tester described in claim 3, characterized in that, A two-dimensional coordinate system is established with the left-right shifting mechanism moving direction as the X-axis and the forward-backward shifting mechanism moving direction as the Y-axis. The zero point (X0, Y0) is the projection of the center of the camera of the indentation detection device onto the Z-axis of the two-dimensional coordinate system. The projection of the center of the pressure head of the pressure device onto the Z-axis of the two-dimensional coordinate system is (Xm, Y0), where X0 = 0mm and Y0 = 0mm. After the component to be pressed is placed in the position of the pressure block, when the pressure application position on the component is: a distance of A3 in the X direction from the left side of the pressure block and a distance of B3 in the Y direction from the rear side of the pressure block, The shifting method includes the following steps: Step 1: The left and right push frames are moved to position X1 in the X-axis by the left and right displacement mechanism. The position X1 refers to the coordinate value of the left inner wall of the left and right push frames in the X-axis. X1 = Xm - A3 - Δa - Sx, where Sx is the reserved displacement value in the X-axis, Sx is the set value, and Sx > 0mm. Step 2: Continue to drive the left and right push frame to move Δa+Sx to the right along the X axis through the left and right displacement mechanism. At this time, the X coordinate value of the pressure position on the workpiece is Xm. Step 3: Then, the front and rear push frames are moved to position Y1 along the Y-axis by the front and rear displacement mechanism. The position Y1 refers to the coordinate value of the rear inner wall surface of the front and rear push frames in the Y-axis. Y1 = Y0 - B3 - Δb - Sy, where Sy is the reserved displacement value in the Y-axis, Sy is the set value, and Sy > 0 mm. Step 4: Continue to move the front and rear push frames forward by a distance Δb+Sy along the Y-axis through the forward and backward displacement mechanism. At this time, the Y coordinate value of the pressure position on the workpiece is Y0. Step 5: Apply pressure to the workpiece using a pressure device to form an indentation; Step 6: The left and right push frames are moved to the left along the X-axis to position X2 by the left and right displacement mechanism. The X2 position refers to the coordinate value of the left inner wall of the left and right push frames in the X-axis, X2 = X0 - A3 - Δa - Sx, where Sx is the reserved displacement value in the X direction, Sx is the set value, and Sx > 0mm. Step 7: Continue to move the left and right push frame to the right by a distance of Δa+Sx along the X-axis through the left and right displacement mechanism. At this time, the X coordinate value of the indentation position on the workpiece to be pressed is X0. Step 8: Then, the front and rear push frames are moved to position Y1 along the Y-axis by the front and rear shifting mechanism. The position Y1 refers to the coordinate value of the rear inner wall surface of the front and rear push frames in the Y-axis. Y1 = Y0 - B3 - Δb - Sy, where Sy is the reserved shift value in the Y-axis, Sy is the set value, and Sy > 0 mm. Step 9: Continue to move the front and rear push frame forward by a distance Δb+Sy along the Y-axis through the front and rear shifting mechanism. At this time, the Y coordinate value of the pressure position on the workpiece is Y0. Step 10: Collect and analyze indentation parameters using an indentation detection device.

9. The shifting method of the fully automatic standard Brinell hardness tester according to claim 8, characterized in that, Step 4 further includes: using a first laser ranging sensor combination to detect whether the distance between the left inner wall of the left and right pushing frame and the left side of the pressure block is within a set value range; using a second laser ranging sensor combination to detect whether the distance between the rear inner wall of the front and rear pushing frame and the rear side of the pressure block is within a set value range; if the distance exceeds the set value range, then repeat steps 1-4; if the distance exceeds the set value range again, then issue an alarm.

10. The shifting method of the fully automatic standard Brinell hardness tester according to claim 9, characterized in that, Step 9 further includes: using a first laser ranging sensor combination to detect whether the distance between the left inner wall of the left and right sliding frame and the left side of the pressure block is within a set value range; using a second laser ranging sensor combination to detect whether the distance between the rear inner wall of the front and rear sliding frame and the rear side of the pressure block is within a set value range; if the distance exceeds the set value range, then repeat steps 6-9; if the distance exceeds the set value range again, then issue an alarm.

Images