A hardness tester with digital readout and convertible measuring mode

Abstract

The utility model discloses a hardness tester of number display reading and convertible measurement mode, including hardness tester main part, the hardness tester main part includes base, the upper surface one end of base is fixedly installed with radial drill press through bolt, the side top of radial drill press is provided with horizontal rocker, the surface of horizontal rocker is provided with electric slide rail, through the convenient conversion detection mechanism of design, can when the rockwell hardness and brinell hardness test of large -scale workpiece, directly handheld knob drives the rotation of adjusting screw to rotate rockwell hardness tester and brinell hardness tester, and through rockwell hardness tester and brinell hardness tester respectively large -scale workpiece rockwell hardness and brinell hardness conversion test operation, open the light, ensure that the brightness is appropriate, the imaging is clear, the imaging is received through digital display screen after imaging, and conversion test is convenient, improve the convenience of two hardness detection of hardness tester main part when using conversion adjustment.

Description

Technical Field

[0001] This utility model belongs to the field of hardness tester technology, specifically relating to a hardness tester with digital display and convertible measurement modes. Background Technology

[0002] In mechanical manufacturing, most companies and customers need to determine the Brinell hardness and Rockwell hardness values ​​of large workpieces according to engineering and technical requirements. Hardness testing is usually carried out by installing a hardness tester, and the existing hardness testers are the equipment used to test the Brinell hardness and Rockwell hardness values ​​of large workpieces.

[0003] A search revealed a patent document with application number CN201420486862.5 that discloses a cantilever hardness tester. This invention improves upon a Z3080 radial drilling machine by replacing the drill bit below the cantilever with a UX50 Brinell hardness tester, creating a movable cantilever hardness tester. The patent details the specific components of the cantilever hardness tester, including the use of a push rod to connect the drill rod of the radial drilling machine to the head of the hardness tester, thus enabling a hardness tester for large industrial products that can be adjusted in all directions.

[0004] The patent document disclosed in application number CN201921597078.0, which is a cantilever hardness tester, addresses the problem of unstable clamping faced by different workpieces. It installs two fixing plates at the front end of the base equipped with a radial drilling machine to hold the workpiece and improve the accuracy of the workpiece measurement value when the workpiece is being measured.

[0005] In summary, in mechanical manufacturing, most companies and customers require the measurement of Brinell hardness values ​​for large workpieces according to engineering and technical requirements, which makes the use of Brinell hardness testers more widespread. However, a small number of companies and customers still require the measurement of Rockwell hardness, which leads to the neglect of Rockwell hardness testing. Many companies do not have the relevant equipment to perform Rockwell hardness testing on large workpieces. Therefore, a single cantilever Brinell hardness tester cannot fully meet market demand and affects the convenience of switching between the two hardness testing modes when using the hardness tester. To address this issue, this utility model proposes a hardness tester with digital display and switchable measurement modes. Utility Model Content

[0006] The purpose of this invention is to provide a hardness tester with digital display and convertible measurement modes, to address the problem mentioned in the background art that, in mechanical manufacturing, most enterprises and customers require the measurement of Brinell hardness values ​​for large workpieces according to engineering technical requirements, which makes the use of Brinell hardness testers more widespread; however, a small number of enterprises and customers still require the measurement of Rockwell hardness of workpieces, which leads to the neglect of Rockwell hardness testing. Many enterprises do not have the relevant equipment to perform Rockwell hardness testing on large workpieces, so a single cantilever Brinell hardness tester cannot fully meet market demand.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a hardness tester with digital display and convertible measurement modes, comprising a hardness tester body, the hardness tester body including a base, a radial drilling machine fixedly mounted on one end of the upper surface of the base by bolts, a horizontal rocker arm provided at the top of one side of the radial drilling machine, an electric slide rail provided on the surface of the horizontal rocker arm, a drill rod body driven to the outer surface of the horizontal rocker arm by the electric slide rail, a top rod rotatably connected to the bottom end of the drill rod body, and the hardness tester body also having:

[0008] A convenient conversion testing mechanism is provided, comprising three sets of adjustment components disposed at the bottom of a top rod. A horizontal mounting component is disposed at the bottom of each of the two sets of adjustment components. A testing component is disposed at the bottom of each of the two sets of horizontal mounting components. A magnifying imaging component is disposed on one side of the testing component located at the bottom of another set of adjustment components. An illumination component is disposed on one side of the magnifying imaging component.

[0009] The protective mechanism includes a mounting component disposed at the top of the adjustment component, a protective component disposed at the bottom end of the mounting component on the outer surface of the detection component, and a buffer protection component disposed on the outer surface of the protective component.

[0010] Preferably, the radial drilling machine has a lead screw rotating inside, and the top end of the lead screw is fixed to the top of the radial drilling machine by bolts to a forward and reverse motor. The outer surface of the lead screw is provided with a movable slide, and the end of the horizontal rocker arm is fixed to the surface of the movable slide by bolts. Both sides of the radial drilling machine are provided with control slide grooves, and the side of the movable slide is slidably connected to the inside of the control slide groove.

[0011] Preferably, the adjustment assembly includes a three-way adapter with the bottom end of a top rod fixedly mounted by bolts, an adjustment screw connected internally to the three-way adapter, and a knob integrally provided on the upper surface of the three-way adapter at the top end of the adjustment screw.

[0012] Preferably, the horizontal mounting assembly includes a connecting frame that is fixedly mounted on the bottom ends of two adjusting screws respectively. A pressure gauge is fixed at the middle position inside the connecting frame. A universal level is provided on the side of the pressure gauge. A manual pressure rod is fixedly mounted on one side of the connecting frame by screws.

[0013] Preferably, the testing assembly includes a Rockwell hardness tester and a Brinell hardness tester, which are respectively fixedly installed at the bottom of the two connecting frames.

[0014] Preferably, the magnifying imaging assembly includes a fixed frame that is fixedly mounted to the bottom of the third adjusting screw by bolts, an imaging camera is fixedly mounted inside the bottom of the fixed frame, a magnifying glass is fixed to the lower surface of the imaging camera, a digital display screen is fixed to one side of the drill rod body, and both the Rockwell hardness tester and the Brinell hardness tester are electrically connected to the imaging camera.

[0015] Preferably, the lighting assembly includes a light fixture fixedly mounted at the bottom of the three-way junction via a flexible rod, and the light fixture is electrically connected to a power source via a wire.

[0016] Preferably, the mounting assembly includes an externally threaded top plate fitted onto the outer surface of the top end of the three-way connector, and a fixing ring integrally provided on the inner surface of the externally threaded top plate. The fixing ring is fixed to the outer surface of the top end of the three-way connector by mounting bolts.

[0017] Preferably, the protective component includes a protective cover disposed at the bottom of the external threaded top plate, wherein a protective sponge is bonded and fixed to the inner bottom of the protective cover by adhesive, and an internal thread structure is provided at the inner top edge of the protective cover, and the internal thread structure is threadedly connected to the outer surface edge of the external threaded top plate.

[0018] Preferably, the buffer protection component includes a rubber sleeve that is bonded to the outer surface of the protective cover with adhesive, and the rubber sleeve is embedded inside the protective cover.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] By designing a convenient conversion testing mechanism, when performing Rockwell and Brinell hardness tests on large workpieces, users can directly rotate the Rockwell and Brinell hardness testers by hand using a knob to drive the adjustment screw. The Rockwell and Brinell hardness tests on large workpieces can be performed separately using the Rockwell and Brinell hardness testers. The lighting is turned on to ensure appropriate brightness and clear imaging. The image received is then displayed on a digital screen. This convenient conversion testing improves the ease of adjusting the hardness tester for both hardness testing methods during use. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This utility model Figure 1 Enlarged structural diagram of section B;

[0023] Figure 3 This is a schematic diagram of the drill rod body, the three-way adapter, and the digital display screen lighting structure of this utility model;

[0024] Figure 4 This utility model Figure 3 Enlarged structural diagram of section C;

[0025] Figure 5 This is a three-dimensional structural diagram of the three-way adapter, Rockwell hardness tester, and Brinell hardness tester of this utility model.

[0026] Figure 6 This is a partial cross-sectional view of the three-pronged adapter, Rockwell hardness tester, and Brinell hardness tester of this utility model.

[0027] Figure 7 This utility model Figure 1 Enlarged structural diagram of section A;

[0028] Figure 8 This is a schematic diagram of the three-pronged adapter and protective cover in the open state of this utility model.

[0029] Figure 9 This is a cross-sectional structural diagram of the external threaded top plate, protective cover, and protective sponge of this utility model;

[0030] In the diagram: 100. Hardness tester body; 101. Base; 1011. External threaded top plate; 1012. Retaining ring; 1013. Rubber sleeve; 1014. Protective cover; 1015. Internal threaded structure; 1016. Protective sponge; 102. Radial drilling machine; 1021. Forward and reverse motor; 1022. Lead screw; 1023. Moving slide; 1024. Control slide; 103. Electric slide rail; 104. Horizontal rocker arm; 105. Drill pipe body; 106, Fixing frame; 1061, Imaging camera; 1062, Magnifying glass; 1063, Lighting lamp; 1064, Digital display screen; 107, Top rod; 1071, Three-way adapter; 1072, Knob; 1073, Adjusting screw; 1074, Connecting frame; 1075, Rockwell hardness tester; 1076, Brinell hardness tester; 1077, Manual pressure rod; 1078, Pressure gauge; 1079, Universal level. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1 to 9 This utility model provides a technical solution: a hardness tester with digital display and convertible measurement modes, including a hardness tester body 100, the hardness tester body 100 including a base 101, a radial drilling machine 102 is fixedly installed on one end of the upper surface of the base 101 by bolts, a horizontal rocker arm 104 is provided at the top of one side of the radial drilling machine 102, an electric slide rail 103 is provided on the surface of the horizontal rocker arm 104, a drill rod body 105 is driven to the outer surface of the horizontal rocker arm 104 through the electric slide rail 103, and a top rod 107 is rotatably connected to the bottom end of the drill rod body 105.

[0033] The radial drilling machine 102 has a lead screw 1022 rotating inside. The top of the lead screw 1022 is located at the top of the radial drilling machine 102 and is fixed to a forward / reverse motor 1021 by bolts. A movable slide 1023 is provided on the outer surface of the lead screw 1022. The end of the horizontal rocker arm 104 is fixed to the surface of the movable slide 1023 by bolts. Control grooves 1024 are provided on both sides of the radial drilling machine 102, and the side of the movable slide 1023 is slidably connected to the interior of the control groove 1024. The hardness tester body 100 is also provided with:

[0034] The convenient conversion testing mechanism includes three sets of adjustment components located at the bottom of the top rod 107. Each set of adjustment components has a horizontal mounting component at its bottom, and each set of horizontal mounting components has a testing component at its bottom. A magnifying imaging component is located on one side of the testing component at the bottom of another set of adjustment components, and an illumination component is located on one side of the magnifying imaging component. This allows the hardness tester body 100 to conveniently switch between Rockwell hardness tester 1075 and Brinell hardness tester 1076 during testing. The hardness tester body 100 facilitates the conversion between Rockwell and Brinell hardness tests on large workpieces, improving the convenience of switching between the two hardness tests during use.

[0035] To facilitate convenient switching between uses via the adjustment component, in this embodiment, preferably, the adjustment component includes a three-way adapter 1071 with the bottom end of the top rod 107 fixed by bolts. The internal thread of the three-way adapter 1071 is connected to an adjustment screw 1073. The top of the adjustment screw 1073 is integrally provided with a knob 1072 on the upper surface of the three-way adapter 1071. The knob 1072 can be held and rotated to switch between the Rockwell hardness tester 1075 and the Brinell hardness tester 1076 for testing, while simultaneously adjusting the imaging camera 1061 again.

[0036] To facilitate the conversion and testing of Rockwell hardness tester 1075 and Brinell hardness tester 1076 using a horizontal mounting assembly, in this embodiment, preferably, the horizontal mounting assembly includes a connecting frame 1074 fixedly mounted on the bottom of two adjusting screws 1073. A pressure gauge 1078 is fixed at the middle position inside the connecting frame 1074. A universal level 1079 is provided on the side of the pressure gauge 1078. A manual pressure rod 1077 is fixedly mounted on one side of the connecting frame 1074 by screws. When converting between Rockwell hardness tester 1075 and Brinell hardness tester 1076, the universal level 1079 can be used to adjust the level for testing. The test value is displayed by the pressure gauge 1078 and fed back to the digital display screen 1064 for reading.

[0037] In order to facilitate the use of the testing component for Rockwell hardness and Brinell hardness testing of large workpieces, in this embodiment, preferably, the testing component includes a Rockwell hardness tester 1075 and a Brinell hardness tester 1076 respectively fixedly installed at the bottom of the two connecting frames 1074. When used on the side of large workpieces, the Rockwell hardness tester 1075 and the Brinell hardness tester 1076 can be switched for convenient testing.

[0038] To facilitate accurate magnification and clear observation during testing using the magnifying imaging component, in this embodiment, preferably, the magnifying imaging component includes a fixed frame 106 bolted to the bottom of the third adjusting screw 1073. An imaging camera 1061 is fixedly mounted inside the bottom of the fixed frame 106, and a magnifying glass 1062 is fixed to the lower surface of the imaging camera 1061. A digital display screen 1064 is fixed to one side of the drill rod body 105. Both the Rockwell hardness tester 1075 and the Brinell hardness tester 1076 are electrically connected to the imaging camera 1061. After the hardness test, the image can be magnified by the magnifying glass 1062 when captured by the imaging camera 1061, and then observed and read again by the digital display screen 1064 when the image is magnified and used.

[0039] In order to facilitate clear imaging during testing using the lighting assembly, in this embodiment, preferably, the lighting assembly includes a lighting lamp 1063 fixedly installed at the bottom of the three-way connector 1071 by a flexible rod, and the lighting lamp 1063 is electrically connected to the power supply through a wire. The lighting lamp 1063 can be turned on when the test is in a dark location in the workshop to ensure appropriate brightness and clear imaging.

[0040] The protective mechanism includes a mounting component located at the top of the adjustment component. The bottom of the mounting component is provided with a protective component on the outer surface of the detection component. The outer surface of the protective component is provided with a buffer protective component. After testing, the protective mechanism can protect the Rockwell hardness tester 1075 and Brinell hardness tester 1076, making them less likely to be exposed to the outside world, ensuring safe use, and allowing for accurate testing again.

[0041] To facilitate the rotational installation of the protective cover 1014 using the mounting components, and to make installation and protection more convenient, in this embodiment, preferably, the mounting components include an externally threaded top plate 1011 fitted onto the outer surface of the top end of the three-way adapter 1071. A retaining ring 1012 is integrally provided on the inner surface of the externally threaded top plate 1011. The retaining ring 1012 is fixed to the outer surface of the top end of the three-way adapter 1071 by mounting bolts. The externally threaded top plate 1011 is fixedly installed by the retaining ring 1012, which facilitates the rotational installation of the protective cover 1014 after the externally threaded top plate 1011 is fixedly installed, thus facilitating installation and protection.

[0042] To facilitate the threaded installation and protection of the protective cover 1014 using the protective component, in this embodiment, preferably, the protective component includes a protective cover 1014 disposed at the bottom end of the external threaded top plate 1011. The inner bottom end of the protective cover 1014 is fixed with a protective sponge 1016 by adhesive. An internal thread structure 1015 is provided at the inner top edge of the protective cover 1014, and the internal thread structure 1015 is threadedly connected to the outer surface edge of the external threaded top plate 1011. The protective cover 1014 can be rotated and installed by the threaded connection between the internal thread structure 1015 and the outer surface of the external threaded top plate 1011 until the protective cover 1014 is installed and comes into contact with the surface of the protective sponge 1016 for protection. After testing, it is not easily exposed to the outside world and is not easily damaged by contact.

[0043] In order to facilitate the buffering and protection of the outer surface of the protective cover 1014 by means of a buffering and protection component, thereby reducing impact, in this embodiment, preferably, the buffering and protection component includes a rubber sleeve 1013 that is fixed to the outer surface of the protective cover 1014 by adhesive, and the rubber sleeve 1013 is embedded inside the protective cover 1014. While the protective cover 1014 provides protection, the rubber sleeve 1013 also provides buffering and protection for the outer surface of the protective cover 1014, thus facilitating protection.

[0044] The working principle and usage process of this utility model are as follows: When using this hardness tester with digital display and convertible measurement modes, the hardness tester body 100 is first placed stably in the usage position by contacting the bottom surface of the base 101. After the hardness tester body 100 is stably placed, when testing is required, the forward and reverse motor 1021 is turned to drive the lead screw 1022 to rotate. The rotation of the lead screw 1022 causes the movable slide block 1023 to move on the outer surface of the lead screw 1022. When the movable slide block 1023 moves, its end is limited and slides inside the control slide groove 1024 until the movable slide block 1023 drives the horizontal rocker arm 104 to adjust to a certain height. Then, the electric slide rail 103 moves to drive the drill rod body 105 to adjust laterally to a certain position, thereby facilitating the adjustment of the drill rod body 105 to the usage position.

[0045] During testing, the roughly machined five-chamber fracturing valve box workpiece is placed horizontally on the base 101, ensuring that the surface to be tested is horizontal and facing upwards, corresponding to the lower surfaces of the Rockwell hardness tester 1075 and the Brinell hardness tester 1076. When Rockwell hardness testing is required, the hand knob 1072 is used to rotate the adjusting screw 1073 to lower the Rockwell hardness tester 1075 to the test height. The hand manual pressure lever 1077 is used to press the Rockwell hardness tester 1075 to a point 5-10 mm above the surface to be tested, and the load is maintained for 5 seconds. The level is controlled by the universal level 1079 to ensure that the Rockwell hardness tester 1075 does not tilt, and the pressure is displayed by the pressure gauge 1078 during pressing.

[0046] Next, lift the Rockwell hardness tester 1075, and adjust the imaging camera 1061 to an appropriate height by rotating the knob 1072 and adjusting the screw 1073 through the fixing frame 106. Turn on the lighting 1063 to ensure appropriate brightness and clear imaging. After imaging, the diameter of the Rockwell hardness indentation is measured to be 3.10 mm based on the image received by the digital display screen 1064. According to the Rockwell hardness value table, the Rockwell hardness of the rough-machined five-cavity fracturing valve box workpiece is determined to be 41 HRC.

[0047] The Rockwell hardness tester 1075 was lifted and placed again, and then switched to the Brinell hardness tester 1076 for testing. The same operation was performed to lower the Brinell hardness tester 1076 to test the Brinell hardness. After the test, the Brinell hardness indentation diameter was measured to be 0.84 mm based on the image received by the digital display screen 1064. According to the Brinell hardness value table, the Brinell hardness of the rough-machined five-cavity fracturing valve box workpiece was determined to be 327 HBW. This facilitates the conversion test between Rockwell hardness and Brinell hardness on large workpieces using the hardness tester body 100, making the conversion test convenient and improving the convenience of switching and adjusting the two hardness tests when using the hardness tester body 100.

[0048] Then, when the hardness tester body 100 is not in use, the external threaded top plate 1011 is fixed to the top of the three-way adapter 1071. The protective cover 1014 is fixedly installed on the outer surface of the three-way adapter 1071 through the internal threaded structure 1015 and the external threaded top plate 1011 threaded connection. After installation, the bottom ends of the Rockwell hardness tester 1075 and the Brinell hardness tester 1076 are in contact with the inner surface of the protective sponge 1016. This makes it easy to fix the Rockwell hardness tester 1075 and the Brinell hardness tester 1076 after the protective cover 1014 is screwed and installed. This makes it less likely to be damaged when exposed to the outside world after use. When the outer surface of the protective cover 1014 is touched, the rubber sleeve 1013 is used to buffer and reduce the impact, which is convenient for protection and improves the convenience of protecting the Rockwell hardness tester 1075 and the Brinell hardness tester 1076 when the hardness tester body 100 is not in use after testing.

[0049] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hardness tester with digital display and convertible measurement modes, comprising a hardness tester body (100), the hardness tester body (100) including a base (101), a radial drilling machine (102) fixedly mounted on one end of the upper surface of the base (101) by bolts, a horizontal rocker arm (104) provided at the top of one side of the radial drilling machine (102), an electric slide rail (103) provided on the surface of the horizontal rocker arm (104), a drill rod body (105) driven to the outer surface of the horizontal rocker arm (104) through the electric slide rail (103), and a top rod (107) rotatably connected to the bottom end of the drill rod body (105), characterized in that: The hardness tester body (100) is also provided with: The convenient conversion testing mechanism includes three sets of adjustment components at the bottom of the top rod (107). The bottom of each of the two sets of adjustment components is provided with a horizontal mounting component. The bottom of each of the two sets of horizontal mounting components is provided with a testing component. A magnifying imaging component is provided on one side of the testing component at the bottom of another set of adjustment components. An illumination component is provided on one side of the magnifying imaging component. The protective mechanism includes a mounting component disposed at the top of the adjustment component, a protective component disposed at the bottom end of the mounting component on the outer surface of the detection component, and a buffer protection component disposed on the outer surface of the protective component.

2. The hardness tester with digital display and switchable measurement modes according to claim 1, characterized in that: The radial drilling machine (102) has a lead screw (1022) rotating inside. The top end of the lead screw (1022) is located at the top end of the radial drilling machine (102) and is fixed with a forward and reverse motor (1021) by bolts. The outer surface of the lead screw (1022) is provided with a movable slide (1023). The end of the horizontal rocker arm (104) is fixed to the surface of the movable slide (1023) by bolts. Both sides of the radial drilling machine (102) are provided with control slide grooves (1024), and the side of the movable slide (1023) is slidably connected to the inside of the control slide groove (1024).

3. A hardness tester with digital display and switchable measurement modes according to claim 1, characterized in that: The adjustment assembly includes a three-way adapter (1071) with the bottom end of a top rod (107) fixed by bolts. An adjustment screw (1073) is internally threaded into the three-way adapter (1071). A knob (1072) is integrally provided on the upper surface of the three-way adapter (1071) at the top end of the adjustment screw (1073).

4. A hardness tester with digital display and switchable measurement modes according to claim 3, characterized in that: The horizontal mounting assembly includes a connecting frame (1074) fixedly mounted on the bottom of two adjusting screws (1073). A pressure gauge (1078) is fixed in the middle of the connecting frame (1074). A universal level (1079) is provided on the side of the pressure gauge (1078). A manual pressure rod (1077) is fixedly mounted on one side of the connecting frame (1074) by screws.

5. A hardness tester with digital display and switchable measurement modes according to claim 4, characterized in that: The testing assembly includes a Rockwell hardness tester (1075) and a Brinell hardness tester (1076) respectively fixedly installed at the bottom of the two connecting frames (1074).

6. A hardness tester with digital display and switchable measurement modes according to claim 5, characterized in that: The magnifying imaging assembly includes a fixed frame (106) that is fixedly mounted on the bottom of the third adjusting screw (1073) by bolts. An imaging camera (1061) is fixedly mounted on the bottom of the fixed frame (106). A magnifying lens (1062) is fixed on the lower surface of the imaging camera (1061). A digital display screen (1064) is fixed on one side of the drill rod body (105). The Rockwell hardness tester (1075) and the Brinell hardness tester (1076) are both electrically connected to the imaging camera (1061).

7. A hardness tester with digital display and switchable measurement modes according to claim 3, characterized in that: The lighting assembly includes a lighting lamp (1063) fixedly installed at the bottom of the three-way junction (1071) by a flexible rod, and the lighting lamp (1063) is electrically connected to the power supply via a wire.

8. A hardness tester with digital display and switchable measurement modes according to claim 3, characterized in that: The mounting assembly includes an externally threaded top plate (1011) fitted onto the outer surface of the top end of the three-way adapter (1071). A retaining ring (1012) is integrally provided on the inner surface of the externally threaded top plate (1011). The retaining ring (1012) is fixed to the outer surface of the top end of the three-way adapter (1071) by mounting bolts.

9. A hardness tester with digital display and switchable measurement modes according to claim 8, characterized in that: The protective assembly includes a protective cover (1014) disposed at the bottom of the external threaded top plate (1011). A protective sponge (1016) is glued and fixed to the bottom of the inner side of the protective cover (1014). An internal thread structure (1015) is provided at the top edge of the inner side of the protective cover (1014), and the internal thread structure (1015) is threadedly connected to the outer surface edge of the external threaded top plate (1011).

10. A hardness tester with digital display and switchable measurement modes according to claim 9, characterized in that: The buffer protection assembly includes a rubber sleeve (1013) that is bonded to the outer surface of the protective cover (1014) with adhesive, and the rubber sleeve (1013) is embedded inside the protective cover (1014).

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