CN1556386A - Fully digital Vickers hardness tester with convertible scale for test results - Google Patents

Abstract

The invention relates to an all-digital Vickers hardness tester with a convertible scale for test results, which belongs to the technical field of testing instruments for mechanical properties of materials. It includes a frame; a test force loading device installed in the frame driven by a worm gear; a force sensor connected with the test force loading device; a displacement sensor whose measuring head moves synchronously with the replaceable pressure head; It also has a force sensor and displacement sensor signal, data processing system, including: force sensor, amplifier, sample and hold device (S/H) and analog/digital (A/D) converter, displacement sensor, amplifier, sample and hold device (S/H) and analog/digital (A/D) converter, clock driver, random access memory RAM, microcomputer, display, read-only memory ROM, keyboard; among them, the sampling frequency of the displacement sensor and the sampling frequency of the force sensor same. The advantage is that the obtained signal is processed by the circuit and the microcomputer, the validity of the test is judged online, and the test result is obtained online; the test result can be converted into hardness values of other scales. After the indenter is replaced with another type of indenter whose working part conforms to the corresponding hardness test method, it is also suitable for directly testing the small load Brinell, Rockwell, and superficial Rockwell hardness of the sample; the test results can also be converted into hardness of other scales value.

Description

Fully digital Vickers hardness tester with convertible scale for test results

technical field

The invention relates to an all-digital Vickers hardness tester with a convertible scale for test results, belonging to the technical field of testing instruments for the mechanical properties of metal materials.

Background technique

At present, the commonly used instruments for testing metal hardness include Brinell hardness tester, Rockwell hardness tester, superficial Rockwell hardness tester, Shore (Leeb) hardness tester and Vickers hardness tester, etc. A hardness tester corresponds to a hardness test method .

At present, all metal hardness testers are limited by the test method and test conditions, and the rated load is loaded at one time, so the indentation depth of the indenter cannot be predicted, the test process and the effectiveness of the test cannot be controlled, and the test cannot be judged in real time. effectiveness; except for Rockwell and superficial Rockwell hardness tests, the test results cannot be obtained online; except for the Vickers hardness test, it is impossible to establish a continuous hardness scale for thick, thin, soft and hard metal samples. Spend. This is the fundamental problem in the current metal hardness test. Although there are digital display Brinell, Rockwell, superficial Rockwell, and Leeb hardness testers put into use at present, their basic structure and principle are the same as the original ones, and it is impossible to exceed the test conditions limited by the test method. The manual operation and calculation of measurement, sample average hardness, hardness indication value fluctuation, etc., did not display and control the main parameters of the test process, and did not judge the validity of the test in real time, so the fundamental problems mentioned above were not overcome or improved.

The Vickers hardness test can establish a continuous Vickers hardness scale for thick, thin, soft, and hard metal samples, but there are some inconveniences and limitations when using the Vickers hardness tester currently used for hardness testing:

① The test force is discontinuous, and there are only a few limited levels. When it is applied, it can only be applied to the indenter at one time according to the test force of the selected level. The method of controlling the test force cannot be used to control the degree of the indenter pressing into the sample. And the test force is also applied to the indenter by the weight through the mechanical structure such as the lever, and the error is large;

② The test results cannot be obtained in real time, the sample needs to be removed, and the length of the diagonal line of the indentation can only be obtained by calculation or table lookup, so the efficiency is low;

③The thickness of the sample or test layer is at least 1.5 times the length of the indentation diagonal line to be an effective test. It is not possible to determine whether the test is valid until the length of the indentation diagonal line is measured. During the test process, the test cannot be known or controlled. effectiveness of

④The Vickers hardness value cannot be converted to other commonly used hardness scales as required. If it needs to be converted, it needs to be manually checked.

At present, there is no hardness tester that can directly measure various commonly used hardness scales, and is fully digital; it can convert the scale continuous Vickers hardness value into other commonly used scale hardness values, and can Convert between other commonly used hardness scales.

Contents of the invention

The purpose of the present invention is to provide a full digital Vickers hardness tester with a convertible scale for test results. Small load Vickers hardness value; at the beginning of the test, the main test conditions can be prompted according to the selected Vickers hardness scale: the test force and the depth of the indenter into the sample are displayed in real time during the test; online judgment is made at the end of the test For the effectiveness of this test, the test data is processed online, the test results are obtained, displayed, and stored; hardness values can be converted between commonly used hardness scales as required. When the cooperation between the indenter and the indenter seat is interchangeable, the said hardness tester is versatile, and can also directly measure the hardness value of other commonly used scales of the sample, and can be converted into other commonly used hardness scales as required. hardness value. The frame of the hardness tester of the present invention can be a desktop that cannot be moved at will, or can be a miniaturized structure. The frame of the miniaturized hardness tester is box-type, which is called a portable hardness tester. It is the preferred solution. It can be used in a fixed laboratory or carried to the field.

The technical solution of the present invention is: a full digital Vickers hardness tester with convertible scale for test results, which includes a frame; a test force loading device installed in the frame and driven by a worm gear; A force sensor connected to the force loading device; a displacement sensor whose measuring head moves synchronously with the replaceable pressure head; it also has a force sensor and a displacement sensor signal, a data processing system, including: force sensor, amplifier, sample and hold device ( S/H) and analog/digital (A/D) converters, displacement sensors, amplifiers, sample and hold devices (S/H) and analog/digital (A/D) converters, clock drivers, random access memory RAM, Microcomputer, display, read-only memory ROM, keyboard; among them, the output signal of the force sensor is amplified by the amplifier, and then transmitted to the sampling and holding device (S/H) and analog/digital (A/ D) Converter, sampled at a frequency of 50 to 100 times per second, converted by an analog/digital (A/D) converter, converted into digital quantities and added, the result is used as the test force; after the output signal of the displacement sensor is amplified by the amplifier, Signal sampling and analog/digital (A/D) conversion are all carried out under the synchronous control of the clock signal of the clock driver; the sampling frequency of the displacement sensor is the same as that of the force sensor.

The effect of the present invention is that the obtained sensor signals and data are processed by the circuit and the microcomputer, and the validity of the test is judged online, and the test results are obtained online; the test results can be converted into hardness values of other scales. After the indenter is replaced with another type of indenter whose working part conforms to the corresponding hardness test method, it is also suitable for directly testing the small load Brinell, Rockwell, and superficial Rockwell hardness of the sample, and the test results can also be converted to other scales hardness value.

Description of drawings

Fig. 1 is the embodiment of the portable hardness meter of mechanical structure of the present invention, and the illustration is the front view of overall structure when testing medium and small-plane sample Vickers hardness or small load Vickers hardness;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is an A-A view of Fig. 1 after the upper cover 3 is removed;

Fig. 4 is the B-B sectional view of Fig. 1;

Fig. 5 is a partial enlarged view of C in Fig. 1;

Fig. 6 is a block diagram of the processing system of the signals obtained by the force sensor 8 and the displacement sensor 10;

Fig. 7 is a structural diagram when the indenter 17 and the indenter seat 20 cooperate with the conical surface;

Fig. 8 is when testing the Vickers hardness of medium and small cylindrical surface samples or the Vickers hardness of small load, the structure diagram of the V-shaped block 47 with pin 48 lined on the support base plate 30;

Fig. 9 is when testing the Vickers hardness of large-scale ferromagnetic equal-diameter cylindrical samples or the Vickers hardness of small loads, the structure diagram of the lower part of the magnetic seat 31 (the embodiment shown in the solid line), and the schematic diagram of the lower part of the template 49 (the implementation shown in the dotted line) example);

Fig. 10 is when testing the Vickers hardness of large-scale ferromagnetic unequal-diameter cylindrical samples or the Vickers hardness of small loads, the trumpet-shaped structure diagram of the lower part of the magnetic base 31 (the embodiment shown by the solid line) and the schematic diagram of the lower part of the template 51 (shown by the dotted line example);

Fig. 11 is when testing the Vickers hardness of the super-large ferromagnetic cylindrical surface sample or the Vickers hardness of the small load, the structure diagram of the template 53 added on the bottom of the magnetic seat 31;

Fig. 12 is a schematic diagram of keyboard composition;

Fig. 13 is a structure diagram of a convex V-shaped spacer 46 lined on the support base plate 30 when testing medium and small-sized cylindrical samples with small loads of Brinell, Rockwell, and superficial Rockwell hardness;

Fig. 14 is a structural view of the indenter 17 during the small load Brinell hardness test.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described as follows:

As shown in Figures 1-14, a full-digital Vickers hardness tester with a convertible scale for test results has a frame; a test force loading device installed in the frame and driven by a worm gear 4 worm 27 ; a force sensor 8 that is connected with the test force loading device; a displacement sensor 10 that a measuring head moves synchronously with the replaceable indenter 17; it also has a force sensor and a displacement sensor signal, a data processing system, which is composed of the following Said part consists of: force sensor 8, amplifier 37, sample and hold device (S/H) and analog/digital (A/D) converter 40, displacement sensor 10, amplifier 38, sample and hold device (S/H) and analog/digital (A/D) converter 40, Digital (A/D) converter 41, clock driver 39, random access memory RAM42, microcomputer 44, display 45, read-only memory ROM55, keyboard 43; The clock signal of the clock driver 39 is transmitted to the sample-and-hold device (S/H) and the analog/digital (A/D) converter 40 in a synchronous manner, and the analog/digital (A/D) converter 40 is sampled at a frequency of 50 to 100 times/second. ) Converter conversion, add after being converted into digital quantity, the result is as test force; Displacement sensor 10 output signals are amplified by amplifier 38, and the sampling of signal, analog/digital (A/D) conversion are all in the clock signal of clock driver 39 Carry out under the synchronous control of; Displacement sensor 10 sampling frequencies are identical with the sampling frequency of force sensor 8; In addition, there are 3 force sensors 8 and 3 amplifiers 37 and 3 sampling and holding devices (S/H ) and analog/digital (A/D) converter 40; 3 force sensors 8 are evenly distributed and fixed on the force sensor seat 7; the keyboard 43 is provided with hardness test method keys and numeric keys, and when the test starts, the signal processing system needs The entered hardness test method and test conditions are determined by the hardness test method key and number keys on the keyboard 43; there is also an "Enter" key on the keyboard 43. After the loading process is completed, when the test force is unloaded to the specified value, the " "Enter" key controls the execution sequence of the microcomputer 44, carries out hardness value calculation, test validity judgment, test result display and storage; there is a "conversion" key on the keyboard 43, and the system is entered into the conversion state by the "conversion" key; The converted hardness test method and test condition are determined by the hardness test method key and the number key of the keyboard 43 in turn; after the microcomputer 44 receives the instruction of "converting" the hardness test method and test condition, it is stored in the read-only memory in advance. The Vickers hardness value in ROM55 is converted from the conversion table of other hardness values, and processed, displayed and stored according to the new scale;

The frame can be a cantilever-type desktop frame, which is suitable for being fixed in a laboratory for practical use. The frame of the embodiment of the present invention is a box-type frame, which is easy to carry to the field for testing. The box-type frame consists of a machine Seat 5 and the extension sleeve 13 that is fixedly connected with its lower end are formed, and there is a force closed frame that can slide up and down and be fixed with the frame on the frame; the test force loading device installed in the frame, its The lower support 25 of the worm 27 is fixed in the machine base 5, and the lower end of the worm gear shaft 6 is connected with the central threaded hole of the force sensor seat 7 to form a force transmission thread pair. The force sensor 8 is located between the force sensor seat 7 and the pressure plate 12, and the pressure head 17 is formed The pressure head bushing 15 fixed in the center hole of the lower end of the extension sleeve 13 is positioned; the displacement sensor 10 is below the worm gear shaft 6, and the measuring head at its lower end is in constant contact with the pressure head 17 or the upper end surface of the pressure head seat 20, and the displacement sensor 10 shell Body is positioned by support plate 22, and this support plate 22 is to be fixedly connected with extension sleeve 13 by support column 21; The power sealing frame includes at least two columns 2 that are distributed on both sides of machine base 5 to support the whole frame; The column 2 upper end A beam 1 is fixedly connected, and the lower end is fixedly connected with a magnetic seat 31 having a magnetic switch 32, which can be magnetically connected with a support base plate 30 or a ferromagnetic sample; The central hole is connected by a cylindrical transition fit, or a cone fit connection, which can be replaced with other indenters whose working parts meet the requirements of the corresponding hardness test method, and can be adapted to directly test the small load Brinell of various material plane and cylindrical surface samples. , Rockwell, Superficial Rockwell hardness.

In conjunction with the accompanying drawings, the technical scheme, working principle and operation method of the hardness tester of the present invention, which is embodied in a portable box-type frame, are described in more detail as follows:

Figures 1 to 5 are structural diagrams of preferred embodiments of the present invention when testing the Vickers hardness of various metal specimens with medium and small planes.

When testing the Vickers hardness of various metal medium and small flat samples 16, the magnetic switch 32 is turned on, so that the magnetic base 31 is adsorbed on the support base plate 30. Frame; the upper cover 3 is connected with the machine base 5 through the connecting cover plate 34; the worm 27 is fixed on the machine base 5 with the upper support 28 and the lower support 25; ; The worm gear shaft 6 is oriented with the shaft bearing 26 and the shaft sleeve 24 . The extension sleeve 13 is fixedly connected to the machine base 5, and three guide rails 11 are evenly distributed on the inside thereof; three force sensors 8 are evenly distributed and fixed on the force sensor seat 7, and the pressure plate 12 is connected with the force sensor seat 7 by a screw rod 23 and is connected to the force sensor 8 Apply a certain pre-pressure; the threaded portion of the worm gear shaft 6 cooperates with the screw hole in the center of the force sensor seat 7, and the force sensor seat 7 and the three V-shaped guide grooves evenly distributed around the pressure plate 12 cooperate with the guide rail 11; the pressure head 17 The conical surface of the upper end cooperates with the conical hole of the pressure head seat 20, and the working part of the lower end extends about 2mm from the end face of the sheath at the bottom of the extension sleeve 13; The triangular support plate 22 is placed in the gap between the three force sensors 8, and is fixed to the extension sleeve 13 by three pillars 21, so that the housing of the displacement sensor 10 is fixed to the machine base 5, and the relative displacement does not occur between the two. And make the measuring head of displacement sensor 10 contact with the upper end surface of pressure head 17 constantly, and obtain preset amount, make the axis of displacement sensor 10 and pressure head 17 axes coaxial simultaneously, when pressure head 17 upper ends are shorter, measuring head and The edge of the upper end of the center hole of the pressure head seat 20 often contacts. The grooves on both sides of the machine base 5 cooperate with the columns 2, so that the machine base 5 can slide up and down between the columns 2 of the force-closed frame, and can be fixed on the columns 2 with the locking hand wheel 35 and the locking plate 36 .

)，然后用锁紧手轮35，锁紧板36将机座5固定于立柱2，此时位移传感器10的读数为a₀；连续均匀施加的外力矩通过手轮33驱动蜗杆27、蜗轮4、蜗轮轴6转动，使压板12压向压头座20，压头17获得的试验力F使其工作端压入试样16。随着试验力F的不断增大，位移传感器10的读数a₁不断变化，压头17压入试样16的深度为h₁＝a₁-a₀。动态的h₁、F同时实时显示。当F达到规定值时停止加载。卸载后位移传感器10的读数为a₂，残余压痕深度h＝a₂-a₀。h和F送微型计算机44按试验方法进行数据处理，在线进行试验有效性判断后，获取试样16这个点的硬度值并显示、存储。每个试样试验结束后，微型计算机44输出硬度平均值和硬度示值波动度等数据。During the Vickers hardness test, loosen the locking handwheel 35, move the machine base 5 so that the sheath 18 contacts the sample 16, and move the indenter 17 upwards so that the displacement sensor 10 obtains a suitable pressure for the measuring indenter 17 to press into the sample. The preset displacement amount of the depth of 16 (in Fig. 5

), then use the locking handwheel 35 and the locking plate 36 to fix the base 5 to the column 2. At this time, the reading of the displacement sensor 10 is a ₀ ; the external torque applied continuously and uniformly drives the worm 27 and the worm wheel 4 through the handwheel 33 , The worm gear shaft 6 rotates, so that the pressure plate 12 is pressed against the indenter seat 20, and the test force F obtained by the indenter 17 makes the working end of the indenter 17 pressed into the sample 16. As the test force F increases, the reading a ₁ of the displacement sensor 10 changes continuously, and the depth of the indenter 17 pressed into the sample 16 is h ₁ =a ₁ −a ₀ . The dynamic h ₁ and F are simultaneously displayed in real time. Stop loading when F reaches the specified value. The reading of the displacement sensor 10 after unloading is a ₂ , and the residual indentation depth h=a ₂ −a ₀ . h and F are sent to the microcomputer 44 to process the data according to the test method, and after the validity of the test is judged online, the hardness value of this point of the sample 16 is obtained and displayed and stored. After the test of each sample is finished, the microcomputer 44 outputs data such as hardness average value and hardness indication value fluctuation.

See Figure 6. The output signals of the three force sensors 8 are respectively amplified by the three amplifiers 37, and then transmitted to the three sampling and holding devices (S/H) in a synchronous manner with the clock signal of the clock driver 39, and passed through the sampling and holding device (S/H) And analog/digital (A/D) converter 40, by the frequency sampling of 50～100 times/second, A/D conversion, the F that will be converted into digital signal is stored in random access memory RAM42, and microcomputer 44 is in it Under the control of the internal clock signal, F of the RAM 42 is displayed on the display 45 in a synchronous manner. Simultaneously, similarly, after the output signal of the displacement sensor 10 is amplified by the amplifier 38, it is transmitted to the sampling and holding device (S/H) 41 under the synchronous control of the clock signal of the clock driver 39, and the A/D conversion by the sampling and holding device 41 Sampling at the same frequency, A/D conversion, and storing the signal converted into a digital signal into the random access memory RAM42, the microcomputer 44, under the control of its internal clock signal, synchronously converts the digital signal into the random access memory RAM42 1. The relative displacement of the measuring head of the displacement sensor 10 (that is, the depth at which the indenter 17 penetrates into the sample 16 ) is simultaneously displayed on the display 45 . After the loading process is over, when the test force F is unloaded to the specified value, the “Enter” key on the keyboard 43 controls the microcomputer 44 to calculate the hardness value, judge the validity of the test, display and store the test results, etc. The function of the keyboard 43 is also that it has a set of number keys and hardness test method keys, which are used to determine the hardness test method and test conditions that the signal processing system will enter when the test starts. For example, press the keys "HV", "1", "0" and "Enter" in sequence, and the system will enter the HV10 test method with a test force of 10kgf.

The upper part of the indenter 17 is a section of cylinder, which is a transition fit with the center hole of the indenter seat 20, and its cooperation is interchangeable, which is convenient for replacement when the indenter 17 is damaged; The seat bushing 15 is a clearance fit. The top of the indenter 17 and the indenter seat 20 can also be matched with a conical surface, with a cone angle of 3° to 5°, as shown in Fig. 7 .

When testing the Vickers hardness of a large ferromagnetic flat sample or the Vickers hardness of a small load, the magnetic switch 32 is turned off, and only the support base 30 is removed, and the magnetic seat 31 is directly adsorbed on the large ferromagnetic flat sample to form a force seal frame.

See Figure 8. When testing the Vickers hardness of medium and small cylindrical samples or the Vickers hardness of small loads, two positioning holes symmetrical to the horizontal axis and the longitudinal axis of the instrument can be pre-opened on the support base plate 30, and the bottom is lined with two positioning holes. V-shaped spacer 47 with pin 48, and adjust the Vickers indenter so that the two diagonals of the indentation are equal to the intersection angles of the sample axis, or one is parallel and the other is vertical, so as to correct the hardness value of the cylindrical surface of the sample is the plane hardness value.

See Figure 9. Fig. 9 is when testing the Vickers hardness of large cylindrical surface ferromagnetic samples of equal diameter or the Vickers hardness of small load, the embodiment of the lower structure of the magnetic seat 31 (shown by the solid line) and the embodiment of the type plate 49 (shown by the dotted line) . When testing the hardness of a large cylindrical sample 50 with equal diameter, the lower part of the magnetic base 31 is made to match the shape of the sample 50 to be tested. It is also possible to use the template 49 shown in dotted lines as a supporting base, and place the axis of the template 49 in line with the axis of the test sample 50 to form a force-enclosed frame.

See Figure 10. When testing the Vickers hardness or Vickers hardness of small-load ferromagnetic samples 52 with different diameters, the lower part of the magnetic base 31 is made into a trumpet-shaped structure. It is also possible to use the template 51 shown in dotted line as the supporting base, and place the horizontal axis of the rack in line with the axis of the tested sample 52 to form a force-enclosed frame.

See Figure 11. Fig. 11 is an embodiment of the structure of the lower mold plate 53 of the magnetic seat 31 when testing the Vickers hardness of a super-large cylindrical surface ferromagnetic sample or the Vickers hardness of a small load. When testing the hardness of the ultra-large cylindrical sample 54, the template 53 is used as the support base plate, and the frame is transversely straddled on the circumference of the sample 54 to form a force-enclosed frame.

See Figure 12. After obtaining the Vickers hardness test value, if the result needs to be converted into hardness value of other commonly used scales, directly press the "conversion" key on the keyboard 43 to make the system enter the conversion state, and then press the keys in sequence to select the test method to be converted into (such as "HB") and selection test conditions (such as "2", "/", "1", "2", "0"), send the hardness scale (ie HB2/120) that needs to be converted to the microcomputer 44 ) instruction, the microcomputer 44 determines the hardness value of the hardness scale (HB2/120) converted into according to the Vickers hardness value and other hardness value conversion tables stored in the read-only memory ROM55 in advance, and processes according to the new scale , display, storage.

The hardness tester provided by the present invention is particularly suitable for making a portable and miniaturized structure, which can be used in a fixed place such as a laboratory, and can be carried to the field for use; Load Vickers hardness test, and after replacing the indenter 17, it can be used for small load Brinell, Rockwell, and superficial Rockwell hardness tests; the hardness of the sample can be directly tested, and the hardness value of each scale can be tested when necessary. The conversion between; the applicable range of sample size and shape is wide, it can be used for the hardness test of plane and cylindrical surface of medium and small samples of various metals, and it can also be used for the hardness test of plane and cylindrical surface of large and super large ferromagnetic samples Test: high degree of digitalization, online judgment of test validity, online acquisition of test values, and display and storage functions.

It should be pointed out that the interchangeable indenter 17 and the indenter seat 20 of the present invention are assembled, so it is only necessary to keep the matching property between the indenter 17 and the indenter seat 20 unchanged, and replace the indenter 17 with the working part to meet the corresponding hardness. After other types of indenters required by the test method, it is also suitable for direct testing of small-load Brinell, Rockwell, and superficial Rockwell hardness tests on flat and cylindrical samples of various materials (when testing medium and small cylindrical samples, the supporting base 30 should be lined with a convex V-shaped pad 46 with a boss at the bottom, and the boss of the V-shaped pad 46 with a convex fits with the center hole of the supporting base plate supporting base plate 30, as shown in Figure 13), for example, replace it as shown in Figure 13. After the indenter with the radius of the convex spherical surface of the working end shown in 14 is R1, the Brinell hardness test of the D=2mm series (such as "HB2/120") can be done, and the test results can be converted into other scales in the same way. hardness value.

Claims (7)

1, the full digital Vickers of the convertible scale of a kind of test findings is characterized in that, it comprises a frame; Test force loading device that is installed in the frame by worm gear (4) worm screw (27) transmission; A force transducer (8) that is connected with the test force loading device; A measuring head moves synchronous displacement transducer (10) with the pressure head (17) that can change; It also has a force transducer and displacement transducer signal, data handling system, comprise: force transducer (8), amplifier (37), sampling holding device (S/H) and analog/digital (A/D) converter (40), displacement transducer (10), amplifier (38), sampling holding device (S/H) and analog/digital (A/D) converter (41), clock driver (39), random access memory ram (42), microcomputer (44), display (45), read only memory ROM (55), keyboard (43); Wherein, force transducer (8) output signal is after amplifier (37) amplifies, with passing to sampling holding device (S/H) and analog/digital (A/D) converter (40) with the synchronous mode of the clock signal of clock driver (39), by 50～100 times/second frequency samplings, the conversion of analog/digital (A/D) converter, be converted to addition behind the digital quantity, the result is as test power; Displacement transducer (10) output signal after amplifier (38) amplifies, signals sampling, and analog/digital (A/D) conversion all under the synchronization of clock signals control of clock driver (39), carry out; Displacement transducer (10) sample frequency is identical with the sample frequency of force transducer (8).

2. sclerometer according to claim 1 is characterized in that, 3 force transducers (8), 3 amplifiers (37), 3 sampling holding devices (S/H) and analog/digital (A/D) converter (40) are arranged in the frame; 3 force transducers (8) are uniform and be fixed in force transducer seat (7).

3. sclerometer according to claim 1, it is characterized in that, keyboard (43) is provided with hardness test method key and numerical key, and signal processing system will enter when on-test hardness test method and test condition are determined by the hardness test method key and the numerical key of keyboard (43); Keyboard (43) is gone up also has " Enter " key, after loading procedure finishes, when test power is offloaded to setting,, carry out that hardness number is calculated, the validity of test is judged, test findings shows and storage by the execution sequence of " Enter " key control microcomputer (44) of keyboard (43).

4. according to claim 1 or 2 or 3 described sclerometers, it is characterized in that " conversion " key is arranged on the keyboard (43), determine that by " conversion " key system enters transition status; The hardness test method and the test condition that need convert to are determined by the hardness test method key and the numerical key of keyboard (43) successively; After microcomputer (44) is received the instruction of " conversion " hardness test method and test condition, be to change according to pre-depositing the Vickers hardness number in the read only memory ROM (55) and the conversion table of other hardness number, and according to new scale handle, show, storage.

5. sclerometer according to claim 1, it is characterized in that, described frame is a cabinet rack, and it mainly is made up of with the spreading cover (13) of fixedlying connected with its lower end support (5), and a upper and lower back and a fixing force-closed framework of frame of sliding of energy is arranged on this frame; The described test force loading device that is installed in the frame, its worm screw lower support (25) is fixed in the support (5), worm-wheel shaft (6) lower end is connected with force transducer seat (7) screwed hole of centre, constitute the power transmission screw thread pair, force transducer (8) is positioned between force transducer seat (7) and the pressing plate (12), and pressure head (17) is by pressure head lining (15) location that is fixed on spreading cover (13) lower end center pit; Described displacement transducer (10) is in worm-wheel shaft (6) below, its lower end often contacts with pressure head (17) or pressing head seat (20) upper end, the housing of displacement transducer (10) is by support plate (22) location, and this support plate (22) is to fixedly connected with spreading cover (13) by support column (21).

6. sclerometer according to claim 1 or 5 is characterized in that force-closed framework comprises at least two columns (2) that are distributed in the whole frame of support (5) supported on both sides; This column (a 2) upper end fixedly connected crossbeam (1), the lower end is fixedly connected to have magnet base (31) magnetic switch (32), that can be connected with magnetic force with bearing plate (30) or ferromagnetism sample.

7. sclerometer according to claim 1 or 5 is characterized in that pressure head (17) has interchangeability, and its upper end is connected with the right cylinder transition fit with the center pit of pressing head seat (20) or cone is connected.

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