Hardmeter head device

Abstract

The utility model discloses a machine head device of a durometer. The machine head device comprises an outer shell, the driving unit is arranged in the outer shell and at least comprises a transmission assembly, an inner sleeve capable of moving relative to the outer shell and a first elastic piece abutting against the transmission assembly and the inner sleeve. The pressure head is connected to the pressure head fixing seat; the pressure sensor is arranged in the inner sleeve, a second elastic piece is arranged outside the pressure sensor in a sleeving mode, and the second elastic piece abuts against the inner sleeve and the pressing head fixing base; the rigidity of the first elastic piece is larger than that of the second elastic piece, and when the pressing head makes contact with the sample platform to compress the second elastic piece till the pressing head abuts against the pressing head sensor, the compression amount of the second elastic piece is determined. The second elastic piece is arranged, when the compression amount of the second elastic piece is not changed after the second elastic piece is pressed, a force loading control signal can be transmitted outwards, the problems of mistaken collision caused by too high descending speed and loading errors caused by material rigidity are solved, and it is ensured that the loading process is stable and rapid.

Description

Technical Field

[0001] The utility model belongs to the technical field of hardness testers, in particular to a hardness tester head device. Background Art

[0002] Existing hardness testers can be divided into manual and fully automatic types. Manual hardness testers require operators to adjust the rise and fall of the sample platform so that the sample and the indenter are within the appropriate range for testing, while fully automatic hardness testers can achieve distance control before sample loading without manual intervention. However, before contacting the sample, the indenter of existing fully automatic hardness testers usually descends too fast, and the speed of the indenter is the same throughout the entire descending process, which will lead to loading errors caused by accidental collisions and material stiffness, and cannot adapt to changes in the thickness of the test block. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the utility model provides a hardness tester head device, which is provided with a second elastic member, and the compression amount of the second elastic member is used as a signal for changing the force loading control to ensure that the force loading process is smooth and rapid.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a hardness tester head device, comprising:

[0005] outer shell;

[0006] A driving unit is disposed in the outer shell, and comprises at least a transmission assembly, an inner sleeve movable relative to the outer shell, and a first elastic member respectively abutting against the transmission assembly and the inner sleeve;

[0007] A pressure head connected to a pressure head fixing seat;

[0008] A pressure sensor is arranged on the inner sleeve, and a second elastic member is sleeved on the outer side, and the second elastic member is respectively against the inner sleeve and the pressure head fixing seat;

[0009] The stiffness of the first elastic member is greater than the stiffness of the second elastic member. When the pressure head contacts the sample platform to compress the second elastic member until the pressure head and the pressure head sensor are against each other, the compression amount of the second elastic member is determined.

[0010] Furthermore, the inner sleeve is connected to an elastic member adapter seat, the pressure sensor is connected to the elastic member adapter seat, and the second elastic member abuts against the elastic member adapter seat.

[0011] Furthermore, the transmission assembly includes a screw rod, a screw nut connected to the screw rod, and a power arm connected to the screw nut, and the first elastic member abuts against the power arm.

[0012] Furthermore, the pressure head, the first elastic member, and the second elastic member are concentrically and coaxially arranged.

[0013] Furthermore, the outer shell is connected to a displacement sensor for monitoring the displacement of the inner sleeve.

[0014] Furthermore, the first elastic member is a disc spring group.

[0015] The beneficial effects of the utility model are: 1) a second elastic member is provided, and when the compression amount no longer changes after being compressed, a signal for force loading control can be transmitted to the outside, which solves the problem of false collision caused by too fast a descending speed and loading error caused by material stiffness, and ensures that the loading process is smooth and rapid; 2) the second elastic member can transmit the force loading control signal to the outside in real time, and at the moment when the pressure head contacts the sample, when the force has not yet exceeded the preload force of the second elastic member, it starts to transmit the force loading control signal to the outside, and the control of the signal is more real-time and more precise; 3) the setting of the first elastic member improves the loading accuracy; 4) the operation is simple, the test is accurate, and the speed control is precise; 5) manual intervention is reduced, the possibility of operating errors is reduced, and the test efficiency is improved; 6) the distance between the pressure head and the sample can be adjusted to a larger range, so it can be suitable for samples of different sizes, and the adaptability is better; 7) the device is small in size and easy to install, which increases the applicable occasions and can be used in narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the utility model.

[0017] Figure 2 The utility model is a cross-sectional view Figure 1 , at this time the pressure sensor does not contact the pressure head.

[0018] Figure 3 The utility model is a cross-sectional view Figure 2 At this time, the pressure sensor contacts the pressure head and the first elastic member is not compressed.

[0019] Figure 4 The utility model is a cross-sectional view Figure 3 , at this time the first elastic member is compressed.

[0020] Figure 5 It is a schematic diagram of the exploded structure of the utility model.

[0021] Among them, 1-outer shell, 11-displacement sensor, 2-driving unit, 21-transmission assembly, 211-screw, 212-screw nut, 213-power arm, 214-coupling, 22-inner sleeve, 23-first elastic member, 3-pressure head, 31-pressure head fixing seat, 4-pressure sensor, 5-second elastic member, 51-elastic member adapter seat. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0023] like Figure 1-Figure 5 As shown, a hardness tester head device includes an outer shell 1, a driving unit 2 arranged in the outer shell 1, an indenter 3 connected to an indenter fixing seat 31, and a pressure sensor 4.

[0024] The driving unit 2 at least includes a transmission assembly 21, an inner sleeve 22 movable relative to the outer shell 1, and a first elastic member 23 respectively abutting against the transmission assembly 21 and the inner sleeve 22. The pressure sensor 4 is arranged on the inner sleeve 22, and the outer sleeve of the pressure sensor 4 is sleeved with a second elastic member 5, and the second elastic member 5 abuts against the inner sleeve 22 and the pressure head fixing seat 31 respectively. Specifically, the inner sleeve 22 is internally threaded with an elastic adapter seat 51, the pressure sensor 4 is threadedly fixedly connected to the elastic adapter seat 51, the upper end of the second elastic member 5 abuts against the elastic member adapter seat 51, and the lower end of the second elastic member 5 abuts against the pressure head fixing seat 31.

[0025] The transmission assembly 21 includes a screw rod 211 , a screw nut 212 connected to the screw rod 211 , and a power arm 213 connected to the screw nut 212 . The upper end of the first elastic member 23 abuts against the power arm 213 , and the lower end of the first elastic member 23 abuts against the inner sleeve 22 .

[0026] The pressure head 3, the first elastic member 23 and the second elastic member 5 are arranged concentrically and coaxially, and the stiffness of the first elastic member 23 is greater than the stiffness of the second elastic member 5. In other words, the first elastic member 23 is a hard spring and the second elastic member 5 is a soft spring. In this embodiment, the first elastic member 23 is a disc spring group, and the second elastic member 5 can be a cylindrical helical compression spring. When the pressure head 3 contacts the sample platform (not shown in the figure) and compresses the second elastic member 5, until the pressure head 3 and the pressure head sensor 4 are against each other, the compression amount of the second elastic member 5 is determined, that is, the compression amount of the second elastic member 5 will not change, and a signal can be transmitted to the outside world at this time.

[0027] The outer shell 1 is connected to a displacement sensor 11, which is used to monitor the displacement of the inner sleeve 22. When the motor rotates to drive the screw 211 to rotate, the screw nut 212 will drive the power arm 213 to move downward, and the power arm 213 abuts against the first elastic member 23, and the first elastic member 23 abuts against the inner sleeve 22. Therefore, in a no-load condition, the power arm 213 moves downward while the inner sleeve 22 also moves downward. A ruler that can be interpreted by the displacement sensor 11 is fixed on the outer wall of the inner sleeve 22. When the inner sleeve 22 and the displacement sensor 11 are relatively displaced, the displacement sensor 11 can sense the displacement of the inner sleeve 22, which is convenient for measuring the residual deformation depth of the sample, that is, measuring the Rockwell hardness value. Specifically, during the test, the position after the initial test force is maintained and the position after the main test force is loaded and unloaded to the initial test force are recorded. The difference between the two positions is the residual deformation depth value of Rockwell, which can be achieved by the existing technology and will not be repeated.

[0028] When the test starts, the motor main shaft drives the coupling 214 to rotate, the coupling 214 drives the screw 211 to rotate, the rotation of the screw 211 drives the screw nut 212 to move linearly downward, the screw nut 212 is connected to the power arm 213, the power arm 213 is connected to the first elastic member 23, the first elastic member 23 is connected to the inner sleeve 22, the inner sleeve 22 is connected to the first elastic member 23, the elastic member adapter 51 is connected to the pressure sensor 4, the elastic member adapter 51 is connected to the second elastic member 5, the second elastic member 5 is connected to the pressure head fixing seat 31, the pressure head fixing seat 31 is connected to the pressure head 3, and the rotation of the screw 211 drives the screw nut 212, the power arm 213, the first elastic member 23, the inner sleeve 22, the pressure sensor 4, the elastic member adapter 51, the second elastic member 5, the pressure head fixing seat 31, and the pressure head 3 to move linearly downward.

[0029] like Figure 3 As shown, when the pressure head 3 touches the test block, the pressure head 3 and the pressure head fixing seat 31 produce a small displacement under the pressure of the second elastic member 5. At this time, the screw nut 212, the power arm 213, the first elastic member 23, the inner sleeve 22, the pressure sensor 4, and the pressure head fixing seat 31 continue to move downward at the speed before contact. When the top surface of the pressure head 3 contacts the lower bottom surface of the pressure sensor 4, the second elastic member 5 stops compressing, that is, the compression amount of the second elastic member 5 is determined. At this time, a signal can be transmitted to the outside world to change the acceleration of the pressure head 3's descent, thereby entering the next speed loading stage.

[0030] When the pressure generated by the screw nut 212 and the power arm 213 exceeds the preload of the first elastic member 23, the first elastic member 23 begins to compress. At this time, the inner sleeve 22, the pressure sensor 4, the elastic member adapter 51, the second elastic member 5, the pressure head fixing seat 31, and the pressure head 3 are relatively stationary, and the screw nut 212 and the power arm 213 continue to move downward to compress the first elastic member 23.

[0031] Therefore, the test process of the hardness tester head device of the utility model is divided into three stages. In the first stage when the indenter 3 does not contact the sample, the indenter 3 descends at a faster speed. In the second stage, the indenter 3 and the pressure sensor 4 are in contact and the second elastic member 5 is compressed. When the compression amount of the second elastic member 5 no longer changes, since the force size at this time is set in advance, when the force is about to reach the size of the force during the loading process, it starts to decelerate in advance and enter the third stage. In the third stage, the speed at which the indenter 3 descends slows down, and the first elastic member 23 is compressed. The specific software control system can be implemented by the existing technology and will not be repeated here.

[0032] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A hardness tester head device, characterized in that: include: An outer shell (1); The drive unit (2) is arranged in the outer shell (1), and comprises at least a transmission assembly (21), an inner sleeve (22) movable relative to the outer shell (1), and a first elastic member (23) respectively abutting against the transmission assembly (21) and the inner sleeve (22); A pressure head (3) connected to a pressure head fixing seat (31); A pressure sensor (4) is arranged on the inner sleeve (22), and a second elastic member (5) is sleeved on the outside thereof, wherein the second elastic member (5) abuts against the inner sleeve (22) and the pressure head fixing seat (31) respectively; The rigidity of the first elastic member (23) is greater than the rigidity of the second elastic member (5). When the pressure head (3) contacts the sample platform to compress the second elastic member (5) until the pressure head (3) and the pressure sensor (4) abut against each other, the compression amount of the second elastic member (5) is determined.

2. The hardness tester head device according to claim 1, characterized in that: The inner sleeve (22) is connected to an elastic member adapter seat (51), the pressure sensor (4) is connected to the elastic member adapter seat (51), and the second elastic member (5) abuts against the elastic member adapter seat (51).

3. The hardness tester head device according to claim 1, characterized in that: The transmission assembly (21) comprises a screw rod (211), a screw rod nut (212) connected to the screw rod (211), and a power arm (213) connected to the screw rod nut (212), and the first elastic member (23) is in abutment with the power arm (213).

4. The hardness tester head device according to claim 1, characterized in that: The pressure head (3), the first elastic member (23), and the second elastic member (5) are arranged concentrically and coaxially.

5. The hardness tester head device according to claim 1, characterized in that: The outer shell (1) is connected to a displacement sensor (11) for monitoring the displacement of the inner sleeve (22).

6. The hardness tester head device according to claim 1, characterized in that: The first elastic member (23) is a disc spring assembly.

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