CN116499912A - Rockwell hardness tester - Google Patents

Rockwell hardness tester Download PDF

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Publication number
CN116499912A
CN116499912A CN202310468053.5A CN202310468053A CN116499912A CN 116499912 A CN116499912 A CN 116499912A CN 202310468053 A CN202310468053 A CN 202310468053A CN 116499912 A CN116499912 A CN 116499912A
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CN
China
Prior art keywords
sleeve
screw rod
pressure head
ram
outer sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310468053.5A
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Chinese (zh)
Inventor
肖芳怡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Chuangchengzhijia Technology Co ltd
Original Assignee
Beijing Chuangchengzhijia Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Chuangchengzhijia Technology Co ltd filed Critical Beijing Chuangchengzhijia Technology Co ltd
Priority to CN202310468053.5A priority Critical patent/CN116499912A/en
Publication of CN116499912A publication Critical patent/CN116499912A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • G01N3/44—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid the indentors being put under a minor load and a subsequent major load, i.e. Rockwell system
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Transmission Devices (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The invention provides a Rockwell hardness tester, and relates to the technical field of hardness testers. A rockwell hardness scale includes a frame, a feed assembly, and a ram assembly. The feeding assembly comprises a screw rod, a connecting sleeve, a mounting sleeve, an outer sleeve and an inner sleeve. The connecting sleeve is sleeved on the screw rod, the mounting sleeve is sleeved on the screw rod, and the mounting sleeve is abutted with the connecting sleeve. The outer sleeve is arranged on the stand, and the inner sleeve is coaxially arranged in the outer sleeve. A large spring is arranged between the inner sleeve and the mounting sleeve. The ram assembly includes a ram and a ram connecting shaft. The pressing head and the pressing head connecting shaft are both arranged in the outer sleeve, a front end cover is arranged at one end of the outer sleeve, and the free end of the pressing head can penetrate through the front end cover to extend out of the outer sleeve. A small spring is arranged between the front end cover and the inner sleeve, and two ends of the pressure head connecting shaft are respectively connected with the inner sleeve and the pressure head. The Rockwell hardness tester can effectively solve the problem that the deformation error of a frame needs to be compensated in the traditional Rockwell hardness tester, and can further improve the hardness measurement precision of a workpiece.

Description

Rockwell hardness tester
Technical Field
The invention relates to the technical field of sclerometers, in particular to a Rockwell hardness meter.
Background
At present, the products can only be used in laboratories, cannot meet the requirements of on-site use, especially production lines, are mostly detected on site by adopting other principle hardness meters, and have the problems of insufficient detection precision and the like, so that the internal quality control of enterprise users is urgent to detect materials in time so as to adjust production control means and improve the internal control quality of the products. Many large durometers are now portable and inconvenient. To solve the above problems, the patent application number is: the patent of CN201610795144.X discloses a portable Rockwell hardness tester, which comprises an outer shell with an opening at one side, wherein a supporting structure is arranged in the shell, the portable Rockwell hardness tester comprises a bottom plate and a main shaft sleeve which are connected by a supporting piece, a cavity is formed in the middle part of the portable Rockwell hardness tester, the bottom plate is connected with the opening of the shell, and a main shaft seat and an inner bearing and an outer bearing are arranged on the surface of the portable Rockwell hardness tester; the pushing mechanism is positioned in the cavity and comprises a main shaft which is fixed on the main shaft seat and axially penetrates through the main shaft sleeve and the bottom plate, a nut with the upper part meshed with the large belt wheel is arranged on the surface of the main shaft, the nut is convex, the bottom of the nut is concave, the nut is sleeved on an outer bearing of the main shaft seat, the large belt wheel is arranged on the supporting piece and rotates in a matched manner with a small belt wheel on one side of the cavity, and the small belt wheel is connected with the stepping motor; the portable effect is achieved. However, the conventional durometers of the type disclosed in the above patent have at least the following problems: when the existing Rockwell hardness tester is used for testing, the displacement sensor is fixed on the frame, the movable end is connected with the pressure head shaft, the relative displacement of the pressure head shaft and the frame is tested in real time, the displacement is regarded as the depth of an indentation, and the actually measured displacement is the sum of the indentation depth and the deformation quanta of a sample (or the frame) in the loading process if the whole workpiece is slightly deformed in the displacement testing method, so that the test error is caused.
Disclosure of Invention
The invention aims to provide a Rockwell hardness tester, which can effectively avoid the problem that the deformation error of a frame needs to be compensated in the traditional Rockwell hardness tester, and can further improve the hardness measurement precision of a workpiece.
Embodiments of the present invention are implemented as follows:
the embodiment of the application provides a Rockwell hardness tester, which comprises a frame, a feeding assembly and a pressure head assembly, wherein the feeding assembly comprises a screw rod, a connecting sleeve, a mounting sleeve, an outer sleeve and an inner sleeve, the screw rod is rotationally arranged on the frame, the connecting sleeve is sleeved on the screw rod and is in threaded connection with the screw rod, the connecting sleeve is in sliding connection with the frame, so that the connecting sleeve can only move along the axial direction of the screw rod, the mounting sleeve is sleeved on the screw rod and can move along the screw rod, the mounting sleeve is abutted with the connecting sleeve, the outer sleeve is arranged on the frame and is coaxial with the screw rod, the outer sleeve can freely slide along the axial direction of the screw rod on the frame, the inner sleeve is coaxially arranged in the outer sleeve and can slide along the outer sleeve, a large spring is arranged between the inner sleeve and the mounting sleeve, one end of the large spring is connected with the mounting sleeve, and the other end of the large spring is connected with the inner sleeve;
the pressure head assembly comprises a pressure head and a pressure head connecting shaft, wherein the pressure head and the pressure head connecting shaft are arranged in the outer sleeve, a front end cover is arranged at one end of the outer sleeve, which is close to one side of the pressure head, the free end of the pressure head can penetrate through the front end cover to extend out of the outer sleeve, a small spring is arranged between the front end cover and the inner sleeve, one end of the small spring is connected with the inner sleeve, the other end of the small spring is connected with the front end cover, a pressure sensor is arranged between the small spring and the inner sleeve, the pressure sensor is arranged on the inner sleeve, one end of the pressure head connecting shaft is connected with the pressure sensor, and the other end of the pressure head connecting shaft is connected with the pressure head.
Further, in the invention, the through hole in the inner sleeve is of a step structure, a large spring bearing support is arranged at the step surface of the step structure in an abutting mode, a large spring front positioning sleeve is arranged on the large spring bearing support, and the spring is connected with the large spring front positioning sleeve.
Further, in the present invention, the mounting sleeve includes a first sleeve body sleeved on the connecting sleeve and a second sleeve body sleeved on the screw rod, the first sleeve body is fixedly connected with the connecting sleeve, the first sleeve body is abutted with the second sleeve body, and the second sleeve body is abutted with the large spring.
Further, in the present invention, a driving unit is connected to the screw, and the driving unit can drive the screw to rotate.
Further, in the present invention, a displacement sensor is provided between the outer sleeve and the inner sleeve.
Further, in the present invention, the front end cover is provided with a pre-pressing sleeve, the pre-pressing sleeve is sleeved on the pressing head, and the pressing head can slide freely along the pre-pressing sleeve.
Further, in the present invention, a ram fixing shaft is provided between the ram connecting shaft and the ram, and one end of the ram fixing shaft is connected to the ram, and the other end is connected to the ram connecting shaft.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the invention provides a Rockwell hardness tester, which comprises a frame, a feeding assembly and a pressure head assembly. The frame is used for mounting and carrying other components. The feeding assembly is used for driving the pressure head assembly to feed and testing the surface of the workpiece with the hardness being detected. The pressure head assembly acts on the surface of the workpiece with the hardness being detected, and after deformation, the hardness of the workpiece can be reflected according to deformation quantity. The feeding assembly comprises a screw rod, a connecting sleeve, a mounting sleeve, an outer sleeve and an inner sleeve. The screw rod is rotatably arranged on the frame, the connecting sleeve is sleeved on the screw rod, and the connecting sleeve is in threaded connection with the screw rod. The connecting sleeve is in sliding connection with the frame, so that the connecting sleeve can only move along the axial direction of the screw rod. The installation sleeve is sleeved on the screw rod and can move along the screw rod. The mounting sleeve is in contact with the connecting sleeve, and the outer sleeve is arranged on the frame and is coaxial with the screw rod. The outer sleeve can freely slide on the frame along the axial direction of the screw rod. The inner sleeve is coaxially arranged in the outer sleeve and can slide along the outer sleeve. A big spring is arranged between the inner sleeve and the mounting sleeve, one end of the big spring is connected with the mounting sleeve, and the other end is connected with the inner sleeve. The pressure head assembly comprises a pressure head and a pressure head connecting shaft, wherein the pressure head and the pressure head connecting shaft are arranged in the outer sleeve, a front end cover is arranged at one end of the outer sleeve, which is close to one side of the pressure head, the free end of the pressure head can penetrate through the front end cover to extend out of the outer sleeve, a small spring is arranged between the front end cover and the inner sleeve, one end of the small spring is connected with the inner sleeve, the other end of the small spring is connected with the front end cover, a pressure sensor is arranged between the small spring and the inner sleeve, the pressure sensor is arranged on the inner sleeve, one end of the pressure head connecting shaft is connected with the pressure sensor, and the other end of the pressure head connecting shaft is connected with the pressure head.
The screw rod and the connecting sleeve form a screw rod mechanism, the connecting sleeve can move along the axis direction of the screw rod by rotating the screw rod, and the mounting sleeve can be pushed to move after the connecting sleeve moves. After the installation sleeve moves, the large spring is driven to compress, and at the moment, the large spring acts on the inner sleeve to enable the inner sleeve to be pressed down. The inner sleeve can be driven to press down after being pressed down, so that the pressure sensor presses down the small spring, and the small spring can firstly drive the front end cover on the outer sleeve to press down. Then, the front end cover is pressed down to drive the whole outer sleeve to be pressed down, and the outer sleeve is firstly abutted against the surface of the workpiece. When the outer sleeve abuts against the surface of the workpiece, the outer sleeve does not move any more. After the outer sleeve is abutted against the workpiece, the inner sleeve can continuously press down, so that the large spring and the small spring are continuously compressed, and the generated elastic acting force continuously acts on the front end cover, so that the front end cover is tightly pressed on the surface of the workpiece. The inner sleeve drives the pressure head connecting shaft to move continuously, and the pressure head stretches out along the front end cover and then continuously presses down on the surface of the workpiece to deform the workpiece. In the process, the front end cover on the outer sleeve always contacts the surface of the workpiece in the whole testing process. In the actual test process, the measured displacement of the inner sleeve relative to the outer sleeve is the displacement of the pressing head relative to the outer sleeve, and the outer sleeve is always in contact with the surface of the workpiece, so that the displacement is the displacement of the pressing head relative to the surface of the workpiece, namely the actual indentation depth. The displacement is always the height difference of the indentation relative to the surface of the sample, is the real displacement depth, has no influence on the test result even if the sample is slightly deformed in the test process, greatly improves the application range of the test finish and the measurement sample, for example, the hardness of a spring type or thin-wall type workpiece which cannot be measured by a conventional Rockwell hardness tester can be accurately measured by using the Rockwell hardness tester.
Therefore, the Rockwell hardness tester can effectively avoid the problem that the deformation error of the frame needs to be compensated in the traditional Rockwell hardness tester, and can further improve the hardness measurement precision of a workpiece.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an external profile view of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the structure of FIG. 1 in the direction B-B;
fig. 3 is an enlarged view of fig. 2 a.
Icon: the device comprises a 1-frame, a 2-screw rod, a 3-connecting sleeve, a 4-first sleeve body, a 5-second sleeve body, a 6-outer sleeve, a 7-inner sleeve, an 8-large spring, a 9-press head, a 10-press head connecting shaft, an 11-front end cover, a 12-small spring, a 13-pressure sensor, a 14-large spring bearing support, a 15-large spring front positioning sleeve, a 16-driving assembly, a 17-displacement sensor, an 18-pre-pressing sleeve and a 19-press head fixing shaft.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1 and 3, fig. 1 is an external outline of an embodiment of the present invention; FIG. 2 is a schematic cross-sectional view of the structure of FIG. 1 in the direction B; fig. 3 is an enlarged view of fig. 2 a. The embodiment provides a Rockwell hardness tester, which comprises a frame 1, a feeding assembly and a pressure head assembly. The above-described frame 1 is used for mounting and carrying other components. The feeding assembly is used for driving the pressure head assembly to feed and testing the surface of the workpiece with the hardness being detected. The pressure head assembly acts on the surface of the workpiece with the hardness being detected, and after deformation, the hardness of the workpiece can be reflected according to deformation quantity.
In this embodiment, the feed assembly comprises a screw 2, a connecting sleeve 3, a mounting sleeve, an outer sleeve 6 and an inner sleeve 7. The screw rod 2 is rotatably arranged on the frame 1, the connecting sleeve 3 is sleeved on the screw rod 2, and the connecting sleeve 3 is in threaded connection with the screw rod 2. The connecting sleeve 3 is slidably connected with the frame 1, so that the connecting sleeve 3 can only move along the axial direction of the screw rod 2. The mounting sleeve is sleeved on the screw rod 2 and can move along the screw rod 2. The mounting sleeve is abutted against the connecting sleeve 3, and the outer sleeve 6 is arranged on the frame 1 and is coaxial with the screw rod 2. The outer sleeve 6 is slidable on the housing 1 in the axial direction of the screw 2. The inner sleeve 7 is coaxially disposed within the outer sleeve 6 and is slidable along the outer sleeve 6. A large spring 8 is arranged between the inner sleeve 7 and the mounting sleeve, one end of the large spring 8 is connected with the mounting sleeve, and the other end is connected with the inner sleeve 7.
In this embodiment, the ram assembly includes a ram 9 and a ram connecting shaft 10, the ram 9 and the ram connecting shaft 10 are both disposed in the outer sleeve 6, a front end cover 11 is disposed at one end of the outer sleeve 6 near one side of the ram 9, a free end of the ram 9 can extend out of the outer sleeve 6 through the front end cover 11, a small spring 12 is disposed between the front end cover 11 and the inner sleeve 7, one end of the small spring 12 is connected with the inner sleeve 7, the other end is connected with the front end cover 11, a pressure sensor 13 is disposed between the small spring 12 and the inner sleeve 7, the pressure sensor 13 is disposed on the inner sleeve 7, one end of the ram connecting shaft 10 is connected with the pressure sensor 13, and the other end is connected with the ram 9.
In this embodiment, the screw rod 2 and the connecting sleeve 3 form a screw rod 2 mechanism, the connecting sleeve 3 can move along the axial direction of the screw rod 2 by rotating the screw rod 2, and the connecting sleeve 3 can push the mounting sleeve to move after moving. After the installation sleeve moves, the big spring 8 is driven to compress, and at the moment, the big spring 8 acts on the inner sleeve to enable the inner sleeve to be pressed down. After the inner sleeve 7 is pressed down, the pressure sensor 13 is driven to press down, and then the pressure sensor 13 presses down the small spring 12, and the small spring 12 firstly drives the front end cover 11 on the outer sleeve 6 to press down. Then, the front end cover 11 is pushed down to drive the whole outer sleeve 6 to be pushed down, and the outer sleeve 6 is firstly abutted against the surface of the workpiece. After the outer sleeve 6 abuts against the surface of the workpiece, it is no longer moved. After the outer sleeve 6 is abutted against the workpiece, the inner sleeve 7 is continuously pressed down, so that the large spring 8 and the small spring 12 are continuously compressed, and the generated elastic acting force continuously acts on the front end cover 11, so that the front end cover 11 is pressed on the surface of the workpiece. The inner sleeve 7 drives the pressure head connecting shaft 10 to move continuously, and the pressure head 9 can extend out along the front end cover 11 and then continuously presses down on the surface of the workpiece to deform the workpiece. In the above process, the front end cover 11 on the outer sleeve 6 always contacts the surface of the workpiece during the whole test process. In this way, in the actual test process, the measured displacement of the inner sleeve 7 relative to the outer sleeve 6 is the displacement of the ram 9 relative to the outer sleeve 6, and the outer sleeve 6 is always in contact with the surface of the workpiece, so that the displacement is the displacement of the ram 9 relative to the surface of the workpiece, i.e. the actual indentation depth. The displacement is always the height difference of the indentation relative to the surface of the sample, is the real displacement depth, has no influence on the test result even if the sample generates a small amount of deformation in the test process, greatly improves the application range of the test finish reading and the measurement sample, for example, for spring type or thin-wall type workpieces which cannot be measured by a conventional Rockwell hardness tester, and can accurately measure the hardness of the workpieces by using the Rockwell hardness tester
Therefore, the Rockwell hardness tester can effectively avoid the problem that the deformation error of the frame 1 needs to be compensated in the traditional Rockwell hardness tester, and can further improve the hardness measurement precision of a workpiece.
In some implementations of this embodiment, the through hole inside the inner sleeve 7 has a stepped structure, a large spring bearing support 14 is disposed on a stepped surface of the stepped structure in an abutting manner, a large spring front positioning sleeve 15 is disposed on the large spring bearing support 14, and the spring is connected to the large spring front positioning sleeve 15.
In this embodiment, the through hole adopts a stepped structure to facilitate installation of the large spring bearing support 14. The big spring front positioning sleeve 15 is arranged on the big spring bearing support 14 through a bearing, then the big spring 8 is abutted with the big spring front positioning sleeve 15, so that the big spring 8 can conveniently act on the inner sleeve 7 after acting the compressed force on the big spring front positioning sleeve 15.
In some implementations of this embodiment, the mounting sleeve includes a first sleeve body 4 sleeved on the connecting sleeve 3 and a second sleeve body 5 sleeved on the screw rod 2, the first sleeve body 4 is fixedly connected with the connecting sleeve 3, the first sleeve body 4 is abutted with the second sleeve body 5, and the second sleeve body 5 is abutted with the large spring 8.
In this embodiment, the first sleeve body 4 is sleeved on the connecting sleeve 3 and then can be connected with the connecting sleeve 3, so that the connecting sleeve 3 moves and then drives the first sleeve body 4 to move, thereby driving the second sleeve body 5 to move.
In some implementations of the present embodiment, a driving assembly 16 is connected to the screw 2, and the driving assembly 16 can drive the screw 2 to rotate. In this embodiment, the driving assembly 16 is used to drive the screw 2 to rotate.
In some implementations of the present embodiment, a displacement sensor 17 is provided between the outer sleeve 6 and the inner sleeve 7. In the present embodiment, the displacement sensor 17 described above can automatically measure the displacement amount between the outer sleeve 6 and the inner sleeve 7.
In some implementations of the present embodiment, the front end cover 11 is provided with a pre-pressing sleeve 18, the pre-pressing sleeve 18 can be sleeved on the pressing head 9, and the pressing head 9 can freely slide along the pre-pressing sleeve 18.
In this embodiment, the pre-pressing sleeve 18 may be pressed against the surface of the workpiece instead of the front end cover 11. At the same time, the pre-compression sleeve 18 can play a guiding and protecting role for the pressure head 9.
In some implementations of the present embodiment, a ram fixing shaft 19 is disposed between the ram connecting shaft 10 and the ram 9, and one end of the ram fixing shaft 19 is connected to the ram 9, and the other end is connected to the ram connecting shaft 10. In the present embodiment, the above-described ram fixing shaft 19 is used to connect the ram connecting shaft 10 and the ram 9.
When the screw rod 2 is used, the driving assembly 16 is started to drive the screw rod 2 to rotate, the connecting sleeve 3 can move along the axis direction of the screw rod 2 by rotating the screw rod 2, and the mounting sleeve can be pushed to move after the connecting sleeve 3 moves. After the installation sleeve moves, the big spring 8 is driven to compress, and at the moment, the big spring 8 acts on the inner sleeve to enable the inner sleeve to be pressed down. After the inner sleeve 7 is pressed down, the pressure sensor 13 is driven to press down, and then the pressure sensor 13 presses down the small spring 12, and the small spring 12 firstly drives the front end cover 11 on the outer sleeve 6 to press down. Then, the front end cover 11 is pushed down to drive the whole outer sleeve 6 to be pushed down, and the outer sleeve 6 is firstly abutted against the surface of the workpiece. After the outer sleeve 6 abuts against the surface of the workpiece, it is no longer moved. After the outer sleeve 6 is abutted against the workpiece, the inner sleeve 7 is continuously pressed down, so that the large spring 8 and the small spring 12 are continuously compressed, and the generated elastic acting force continuously acts on the front end cover 11, so that the front end cover 11 is pressed on the surface of the workpiece. The inner sleeve 7 drives the pressure head connecting shaft 10 to move continuously, and the pressure head 9 can extend out along the front end cover 11 and then continuously presses down on the surface of the workpiece to deform the workpiece. In the above process, the front end cover 11 on the outer sleeve 6 always contacts the surface of the workpiece during the whole test process. In this way, in the actual test process, the measured displacement of the inner sleeve 7 relative to the outer sleeve 6 is the displacement of the ram 9 relative to the outer sleeve 6, and the outer sleeve 6 is always in contact with the surface of the workpiece, so that the displacement is the displacement of the ram 9 relative to the surface of the workpiece, i.e. the actual indentation depth. The displacement is always the height difference of the indentation relative to the surface of the sample, is the real displacement depth, has no influence on the test result even if the sample is slightly deformed in the test process, greatly improves the application range of the test finish and the measurement sample, for example, the hardness of a spring type or thin-wall type workpiece which cannot be measured by a conventional Rockwell hardness tester can be accurately measured by using the Rockwell hardness tester.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The Rockwell hardness tester is characterized by comprising a frame, a feeding assembly and a pressure head assembly, wherein the feeding assembly comprises a screw rod, a connecting sleeve, a mounting sleeve, an outer sleeve and an inner sleeve, the screw rod is rotatably arranged on the frame, the connecting sleeve is sleeved on the screw rod and is in threaded connection with the screw rod, the connecting sleeve is in sliding connection with the frame so that the connecting sleeve can only move along the axis direction of the screw rod, the mounting sleeve is sleeved on the screw rod and can move along the screw rod, the mounting sleeve is abutted with the connecting sleeve, the outer sleeve is arranged on the frame and is coaxial with the screw rod, the outer sleeve can freely slide along the axis direction of the screw rod on the frame, the inner sleeve is coaxially arranged in the outer sleeve and can slide along the outer sleeve, a large spring is arranged between the inner sleeve and the mounting sleeve, one end of the large spring is connected with the mounting sleeve, and the other end of the large spring is connected with the inner sleeve;
the pressure head assembly comprises a pressure head and a pressure head connecting shaft, the pressure head and the pressure head connecting shaft are both arranged in the outer sleeve, a front end cover is arranged at one end of the outer sleeve, which is close to one side of the pressure head, the free end of the pressure head can penetrate through the front end cover to extend out of the outer sleeve, a small spring is arranged between the front end cover and the inner sleeve, one end of the small spring is connected with the inner sleeve, the other end of the small spring is connected with the front end cover, a pressure sensor is arranged between the small spring and the inner sleeve, the pressure sensor is arranged on the inner sleeve, one end of the pressure head connecting shaft is connected with the pressure sensor, and the other end of the pressure head connecting shaft is connected with the pressure head.
2. The rockwell hardness tester according to claim 1, wherein the inner sleeve has a stepped structure with a stepped surface, a large spring bearing support is provided in contact with the stepped surface of the stepped structure, a large spring front positioning sleeve is provided on the large spring bearing support, and the spring is connected with the large spring front positioning sleeve.
3. The rockwell hardness machine according to claim 1, wherein the mounting sleeve comprises a first sleeve body sleeved on the connecting sleeve and a second sleeve body sleeved on the screw rod, the first sleeve body is fixedly connected with the connecting sleeve, the first sleeve body is abutted with the second sleeve body, and the second sleeve body is abutted with the large spring.
4. The rockwell hardness machine of claim 1, wherein the screw is connected with a drive assembly, the drive assembly being capable of driving the screw to rotate.
5. The rockwell hardness scale according to claim 1, wherein a displacement sensor is provided between the outer sleeve and the inner sleeve.
6. The rockwell hardness machine according to any one of claims 1 to 5, wherein a pre-compression sleeve is provided on the front end cap, the pre-compression sleeve being able to be fitted over the ram, and the ram being able to slide freely along the pre-compression sleeve.
7. The rockwell hardness machine according to claim 1, wherein a ram fixing shaft is provided between the ram connecting shaft and the ram, one end of the ram fixing shaft is connected to the ram, and the other end is connected to the ram connecting shaft.
CN202310468053.5A 2023-04-26 2023-04-26 Rockwell hardness tester Pending CN116499912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310468053.5A CN116499912A (en) 2023-04-26 2023-04-26 Rockwell hardness tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310468053.5A CN116499912A (en) 2023-04-26 2023-04-26 Rockwell hardness tester

Publications (1)

Publication Number Publication Date
CN116499912A true CN116499912A (en) 2023-07-28

Family

ID=87317804

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310468053.5A Pending CN116499912A (en) 2023-04-26 2023-04-26 Rockwell hardness tester

Country Status (1)

Country Link
CN (1) CN116499912A (en)

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