CN212379229U - Electronic portable sclerometer - Google Patents

Abstract

A portable electric hardometer belongs to the technical field of hardometers, and overcomes the problems of large labor intensity, low detection efficiency and large volume and inconvenient carrying caused by the adoption of a belt transmission mode in the prior art due to the fact that a hand wheel is used for applying test force, a motor is installed on a main frame, a first coupler is fixedly sleeved on an output shaft of the motor, a second coupler is sleeved at the lower end of the first coupler, a coded disc installation seat is further installed on the first coupler, a rotary coded disc is installed at the lower portion of the coded disc installation seat, a coded disc reading head is installed on the main frame, a battery is connected with an electronic circuit module, the portable electric hardometer has the advantages that the motor is used for driving, the battery is used for supplying power, the micrometer screw rod and the motor rotate at the same speed and move axially under the condition that the position of the motor is unchanged, stress application precision and detection efficiency are improved, the labor intensity is improved, and the miniaturization, more portable has enlarged the application place of electronic portable sclerometer.

Description

Electronic portable sclerometer

Technical Field

The utility model belongs to the technical field of the sclerometer, in particular to electronic portable sclerometer.

Background

Hardness values are typically measured by loading a specified indenter with a specified test force and measuring the indentation. The hardness meter can be classified into a desk type hardness meter, which is mainly installed in a fixed place such as a laboratory for use, and a portable type hardness meter, which is portable and is mainly used in a workshop or an engineering site, distinguished from a use place. Unlike a table type hardness tester which generally requires a workpiece to be tested to be placed on a measuring table and a test force to be applied to a pressing head so that the pressing head is pressed into the surface of the workpiece to measure hardness, a portable magnetic hardness tester is attached to the surface of a steel material by a magnetic chuck or clamps the workpiece by a C-shaped frame to measure hardness, and can be used for measuring large or inconvenient moving workpieces.

Utility model with application number CN200820231921.9 discloses a portable magnetic force sclerometer of mechanical type. The utility model discloses an utilize two magnetic force sucking discs to fix the sclerometer measuring head on steel workpiece surface, the sclerometer has a experimental power loading, indentation degree of depth measurement and hardness number indicating system of compriseing hand wheel, accurate micrometer screw thread pair and reading drum, utilizes the size of U type elastomer and dial gauge indication test power, and the hardness number reads out on the reading drum. However, the utility model has the problems of more complicated operation, low efficiency, low precision and low resolution, and simultaneously has the problems of large artificial reading error and uncorrectable force value.

In order to overcome the defects, the invention with the application number of CN201210065120.0 discloses a portable digital display magnetic hardness tester, which mainly comprises a stress application and indentation depth measuring device consisting of a hand wheel, a rotary encoder and a micrometer thread pair, and also comprises a supporting seat, a force measuring device, a pressure head, an electronic circuit board and a display; the force sensor is used for measuring the magnitude of the test force, the micrometer thread pair and the rotary encoder are used for measuring the indentation depth, the hand wheel is rotated to realize the loading of the test force, and the test force value and the measured Rockwell hardness value are displayed on the electronic display screen. The invention improves the accuracy of force value measurement, depth measurement and hardness measurement, improves the convenience of displaying resolution and reading, simplifies the measurement steps and improves the detection efficiency. However, the invention applies the test force by manually rotating the hand wheel, and manually adjusts the test force by using the force value displayed by the visual display, so the labor intensity is high, the detection efficiency is low, and the hand wheel drives the micrometer screw rod to axially move along with the rotation of the hand wheel, and the hand wheel serving as a power source also axially moves, so the test force loading is greatly influenced by human factors, the stress application precision is not high, the consistency is not good, and the hardness measurement precision is influenced. In addition, the rotary encoder is integrally arranged on the supporting seat, and a hollow rotary shaft of the rotary encoder is sleeved on the micrometer screw rod through a shaft sleeve, namely, the rotary encoder rotary shaft occupies a height space of 40-50 mm, so that the height and the weight of the whole machine are increased. The invention also provides that the hand wheel of the invention can be replaced by a motor, the output shaft of the motor is connected with the sleeve, and the sleeve, the micrometer screw and the rotary encoder are driven by the motor to rotate. However, if the structure of the invention that the motor replaces the hand wheel is simply adopted, two main problems exist, firstly, the height and the weight of the whole machine must be increased because the motor and the speed reducer are at least 50mm, which is contrary to the design requirements of miniaturization and light weight of a portable hardometer; secondly, because the micrometer screw rod is required to rotate and move axially while rotating during measurement, if the motor serving as a power source also moves axially along with the micrometer screw rod like a hand wheel, the complexity of the structure and the manufacturing cost are inevitably increased, the height and the weight of the hardness tester are increased, and the hardness measurement precision is influenced. How to drive the micrometer screw to rotate and move axially under the condition that the position of a motor serving as a power source is not changed is a technical problem to be solved.

The invention with the application number of CN201610795144.X discloses a portable Rockwell hardness tester, which comprises an external shell with an opening on one side, and a support structure, a pushing mechanism, a large belt wheel, a small belt wheel, a stepping motor and the like which are arranged in the shell. Because the hardness tester is driven by the motor and does not adopt a battery for power supply, the portability of the hardness tester is greatly influenced, and the use place is greatly limited. In addition, the structure adopted by the invention is an arrangement mode that the motor is parallel to the measuring main shaft instead of coaxial, so that the structure is not compact enough, the appearance volume is larger, and the flexible carrying and use on site are not facilitated. Particularly, as shown in the attached drawing of the invention, the invention adopts a belt transmission mode, a large belt wheel is arranged on a support member, a small belt wheel is connected with a stepping motor, the large belt wheel and the small belt wheel rotate in a matched manner through a belt, and the belt is an elastic body and can deform to a certain extent when being stressed, so that the response speed of converting the torque of the motor into the movement of a pressure head is not fast enough, when the test force is subjected to closed-loop adjustment, the adjustment period is long, and the accuracy of the test force is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem, overcome prior art's weak point, the provision adopts motor drive, battery powered, reduce intensity of labour and labour cost, improve experimental loaded uniformity of power and stability, and solve the motor as the power supply and drive the micrometer screw rod under the unchangeable condition in position and be an electronic portable sclerometer of axial displacement simultaneously rotating, simultaneously through compact reasonable structural design, realize the miniaturization and the lightweight of sclerometer complete machine, so that be fit for more extensive application place.

The utility model adopts the technical proposal that the device comprises a main frame, a motor, a micrometer screw, a micrometer nut, a sliding connecting sleeve, a shaft sleeve, a force sensor, a pressure head, an electronic circuit module, a display and a battery, wherein the motor is fixedly arranged on the main frame, a first shaft coupling is fixedly arranged on an output shaft of the motor, a first axial key groove is arranged on the outer cylindrical surface of the first shaft coupling, a second shaft coupling is sleeved outside the first shaft coupling, a first connecting key is arranged on the inner wall of the second shaft coupling, the first connecting key can slide in the first axial key groove of the first shaft coupling and drive the second shaft coupling to rotate at the same speed with the motor at the same time of sliding, the micrometer screw is fixedly arranged at the lower end of the second shaft coupling, a code disc mounting seat is also arranged on the first shaft coupling, and a rotary code disc consisting of a code disc seat and a code disc is arranged at the lower part of the code disc mounting seat, the rotary coded disc and the first coupling rotate synchronously, a coded disc reading head is further mounted on the main frame, and coded disc sheets of the rotary coded disc stretch into a reading notch of the coded disc reading head.

The lower extreme of second shaft coupling is equipped with interior wedge recess micrometer screw rod upper end is equipped with outer wedge bulge head and is equipped with axial screw hole on outer wedge bulge head, the second shaft coupling with micrometer screw rod passes through the interior wedge recess of second shaft coupling and micrometer screw rod's outer wedge bulge head interconnect to it is fixed through the countersunk screw locking of installation in axial screw hole.

The main frame comprises an upper platform and a lower platform, an upper platform through hole is formed in the upper platform, a lower platform through hole is formed in the position, corresponding to the upper platform through hole, of the lower platform, the lower platform through hole is a second-order stepped hole, a micrometer nut is fixedly installed in a first stepped hole of the lower platform through hole formed in the lower platform of the main frame, and a shaft sleeve is fixedly installed in a second stepped hole of the lower platform through hole formed in the lower platform of the main frame.

The rear side of the lower end of the main frame is provided with a groove, a power circuit board is arranged in the groove, a battery seat is arranged on the power circuit board, and a battery is arranged in the battery seat.

The first coupler is a T-shaped coupler, and a first axial keyway is arranged on the outer cylindrical surface with the small diameter of the first coupler.

Magnetic suckers are symmetrically arranged on two sides of the lower end of the main frame.

The force sensor, the display, the coded disc reading head, the battery and the motor are respectively connected with the electronic circuit module.

The battery is connected with the power supply circuit board, and the battery is connected with the motor through the power supply circuit board.

And a lifting handle is also arranged at the upper end of the main frame.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses a motor replaces the automatic experimental power of exerting of hand wheel to adopt 2 shaft couplings to realize that motor and micrometer screw rod are connected, wherein, first shaft coupling and second shaft coupling pass through first connecting key and are connected, and first connecting key can slide in the first axial keyway of first shaft coupling, and drive second shaft coupling and motor rotation with fast sliding simultaneously, because micrometer screw rod fixed mounting is in the lower extreme of second shaft coupling, so, just so, realized under the unchangeable condition of the rigidity of the motor as the power supply that micrometer screw rod is axial displacement with motor rotation with fast, improved afterburning uniformity and stability, thereby improved afterburning precision and detection efficiency, improved intensity of labour, got rid of the influence of human factor to measurement accuracy.

(2) The utility model is characterized in that a code disc mounting seat is arranged on a first coupler, a rotary code disc consisting of a code disc seat and a code disc is arranged at the lower part of the code disc mounting seat, the rotary code disc and the first coupler synchronously rotate, a code disc reading head is also arranged on a main frame, the code disc of the rotary code disc is inserted into a reading gap of the code disc reading head, namely, a rotary encoder which is integrally arranged on a supporting seat in the prior art is replaced by a matching structure of the rotary code disc and the code disc reading head, wherein the code disc mounting seat is sleeved on the first coupler without occupying height space, a sliding connecting sleeve is improved at the same time, a pressing cap and two semi-rings at the lower end of a micrometer screw rod are omitted, a sleeve which is connected with the upper end of the micrometer screw rod in the prior art and is fixed in an inner hole of a hand wheel is replaced by matching of the first coupler and a second coupler, and the structure design, the height space and the weight of the whole hardness tester are reduced, after the motor and the speed reducer are adopted as power sources to replace a hand wheel serving as a power source, the height and the weight of the whole hardness tester are not increased, and the miniaturization and the light weight of the whole hardness tester are realized.

(3) The main frame includes upper mounting plate and lower platform, is equipped with the upper mounting plate through-hole on the upper mounting plate, and the position that corresponds the upper mounting plate through-hole on the platform is equipped with down the platform through-hole down, the platform through-hole is the second order shoulder hole down, and fixed mounting micrometer nut in the first shoulder hole of platform through-hole under, the fixed mounting axle sleeve in the second step hole of the lower platform through-hole of seting up on the platform down makes the utility model discloses the structure of main frame is more stable, has guaranteed measurement accuracy to make the structure compacter.

(4) First shaft coupling is T shape shaft coupling, is equipped with first axial keyway on the face of cylinder outside the minor diameter of first shaft coupling, simultaneously, the lower extreme face of cylinder shape of the major diameter of the first shaft coupling of T shape forms the location of code wheel mount pad and plays coaxial positioning effect to the code wheel mount pad for the structure is compacter.

(5) The utility model discloses a battery is as power supply, and the battery not only is the power supply of electronic circuit module, still is the motor power supply, and the motor does not need external alternating current power supply, and the carrying of the sclerometer of being more convenient for has enlarged the applied place of electronic portable sclerometer.

Drawings

Figure 1 is a schematic structural view of the present invention,

figure 2 is a left side view of figure 1,

figure 3 is an enlarged cross-sectional view a-a of figure 1,

figure 4 is an enlarged view of a portion of figure 1 at B,

FIG. 5 is a schematic structural view of the utility model after the magnetic suction cup and the handle are installed,

fig. 6 is a schematic block circuit diagram of the present invention.

In the drawings

1. A main frame, 1-1. an upper platform, 1-2. an upper platform through hole, 1-3. a lower platform,

1-4. lower platform through hole

2. A motor, 3, a first coupler, 3-1, a first axial keyway,

4-1, a first connecting bond, 4-2, a second connecting bond,

5. a second coupling, 5-1, an inner wedge-shaped groove,

6-1, encoder module, 6-2, encoder code wheel,

7. a micrometer screw, 7-1. an external wedge-shaped protruding head, 7-2. a first spherical groove,

7-3, an annular groove,

8. countersunk head screw, 9 micrometer nut, 10 steel ball,

11. sliding connecting sleeve, 11-1, second spherical groove, 11-2, second axial key groove

12. A card board, 13, a shaft sleeve, 14, a force sensor,

15. a pressure head seat, 16 pressure heads, 17 magnetic force suckers,

18. a code wheel mounting base, 19, an electronic circuit module,

20. display, 21, battery, 22, jackscrew,

23. power supply circuit board, 24 battery seat, 25 handle.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

As shown in figures 1-5, the technical scheme adopted by the utility model comprises a main frame 1, the main frame 1 comprises an upper platform 1-1 and a lower platform 1-3, the upper platform 1-1 is provided with an upper platform through hole 1-2, the lower platform 1-3 is provided with a lower platform through hole 1-4 corresponding to the upper platform through hole 1-2, the lower platform through hole 1-4 is a second-order stepped hole, the upper surface of the upper platform 1-1 of the main frame 1 is fixedly provided with a motor 2, the output shaft of the motor 2 passes through the upper platform through hole 1-2 of the main frame 1, a micrometer nut 9 is fixedly arranged in a first stepped hole of the lower platform through hole 1-4 arranged on the lower platform 1-3 of the main frame 1, a shaft sleeve 13 is fixedly arranged in a second stepped hole of the lower platform through hole 1-4 arranged on the lower platform 1-3 of the main frame 1, a first coupling 3 is sleeved on an output shaft of the motor 2, and the first coupling 3 and the output shaft of the motor 2 rotate synchronously; the first coupler 3 is a T-shaped coupler, a first axial key groove 3-1 is formed in the outer cylindrical surface of the small diameter of the first coupler 3, a second coupler 5 is sleeved outside the lower end of the first coupler 3, the second coupler 5 and the first coupler 3 are in clearance fit, a first connecting key 4-1 is installed on the inner wall of the second coupler 5, the first connecting key 4-1 is composed of a cuboid and a cylindrical protrusion on one side of the cuboid, the cylindrical protrusion of the first connecting key 4-1 is inserted into a round hole formed in the inner wall of the second coupler 5, the first connecting key 4-1 can slide in the first axial key groove 3-1 of the first coupler 3 and drives the second coupler 5 to rotate at the same speed as the motor 2 at the same time of sliding, a micrometer screw 7 is installed at the lower end of the second coupler 5, the lower end of the second coupler 5 is provided with an inner wedge-shaped groove 5-1, the upper end of the micrometer screw 7 is provided with an outer wedge-shaped protruding head 7-1, the outer wedge-shaped protruding head 7-1 is provided with an axial threaded hole, the second coupler 5 and the micrometer screw 7 are mutually connected with the outer wedge-shaped protruding head 7-1 of the micrometer screw 7 through the inner wedge-shaped groove 5-1 of the second coupler 5, and are locked and fixed through a countersunk head screw 8 arranged in the axial threaded hole; the middle part of the micrometer screw 7 is processed with external threads, the middle part thread section of the micrometer screw 7 and the internal thread section of the micrometer nut 9 form a thread pair, the lower end of the micrometer screw 7 passes through the micrometer nut 9 and enters a second stepped hole of a lower platform through hole 1-4 of the main frame 1 to be connected with a sliding connecting sleeve 11 arranged in a shaft sleeve 13, the lower end of the micrometer screw 7 is provided with a first spherical groove 7-2, the lower end of the micrometer screw 7 higher than the end surface is provided with an annular groove 7-3, the upper end of the sliding connecting sleeve 11 is provided with a second spherical groove 11-1, the outer cylindrical surface of the sliding connecting sleeve 11 is provided with a second axial key groove 11-2 parallel to the axis, a steel ball 10 is arranged between the first spherical groove 7-2 at the lower end of the micrometer screw 7 and the second spherical groove 11-1 at the upper end of the sliding connecting sleeve 11, through the structural design, when the micrometer screw 7 rotates and moves downwards in the micrometer nut 9, the steel ball 10 is pushed, and the sliding connecting sleeve 11 is further pushed to move downwards; the lower end of the micrometer screw 7 is provided with a circular sheet-shaped clamping plate 12 with a single-side opening in an annular groove 7-3 higher than the end face, the clamping plate 12 is arranged on the sliding connecting sleeve 11, the opening of the clamping plate 12 is slightly larger than the diameter of the bottom of the annular groove 7-3 and smaller than the diameter of the top edge of the annular groove 7-3, the thickness of the clamping plate 12 is smaller than the width of the annular groove 7-3, through the structural design, when the micrometer screw 7 rotates and moves upwards in the micrometer nut 9, the clamping plate 12 is driven, the sliding connecting sleeve 11 is further driven to move upwards, the inner wall of the shaft sleeve 13 is provided with a second connecting key 4-2, the second connecting key 4-2 is positioned in a second axial key groove 11-2 which is arranged on the outer cylindrical surface of the sliding connecting sleeve 11 and is parallel to the axis, the sliding connection sleeve 11 cannot rotate when axially sliding in the shaft sleeve 13, the force sensor 14 is installed at the lower end of the sliding connection sleeve 11, the press head seat 15 is installed at the lower end of the force sensor 14, the press head 16 is installed at the lower end of the press head seat 15, and the measuring tip direction of the press head 16 is vertically downward.

The output shaft of the motor 2, the first coupler 3, the second coupler 5, the micrometer screw 7, the micrometer nut 9, the sliding connecting sleeve 11, the shaft sleeve 13, the force sensor 14, the pressure head seat 15 and the pressure head 16 are coaxial.

The first coupler 3 is further provided with a coded disc installation seat 18, the coded disc installation seat 1 is coaxially positioned through the lower end face of the large-diameter outer cylindrical face of the T-shaped first coupler 3, the lower portion of the coded disc installation seat 18 is provided with a rotary coded disc 6-1 consisting of a coded disc seat and coded discs and is tightly pressed and fixed through a jackscrew 22, the rotary coded disc 6-1 and the first coupler 3 rotate synchronously, the main frame 1 is further provided with a coded disc reading head 6-2, and the coded disc of the rotary coded disc 6-1 extends into a reading gap of the coded disc reading head 6-2.

Magnetic suction cups 17 are symmetrically arranged on two sides of the lower end of the main frame 1.

An electronic circuit module 19 is mounted on the left magnetic suction cup 17 of the main frame 1, a display 20 is mounted on the front side of the main frame 1, a groove is formed in the rear side of the lower end of the main frame 1, a power circuit board 23 is mounted in the groove, a battery holder 24 is mounted on the power circuit board 23, and a battery 21 is mounted in the battery holder 24.

A handle 25 is further installed at the upper end of the main frame 1.

As shown in fig. 6, the force sensor 14, the display 20, the code wheel reading head 6-2, the battery 21 and the motor 2 are respectively connected with the electronic circuit module 19; or the battery 21 is connected with the power circuit board 23, and the battery 21 is connected with the motor 2 through the power circuit board 23.

The utility model discloses a theory of operation is:

after the machine is started, the whole machine is adsorbed on the surface of a sample to be tested through a magnetic chuck 17, or the utility model is fixed on the surface of the sample to be tested through a C-shaped frame, a measuring key is clicked, a motor 2 is started and drives a first coupler 3 to synchronously rotate through an output shaft of the motor 2, the first coupler 3 drives a rotary code disc 6-1 to synchronously rotate and simultaneously drives a second coupler 5 to synchronously rotate through a first connecting key 4-1, the second coupler 5 drives a micrometer screw 7 to synchronously rotate, because the micrometer screw 7 and the micrometer nut 9 form a thread pair, the micrometer screw 7 moves downwards in the micrometer nut 9 to push a steel ball 10, the steel ball 10 pushes a sliding connecting sleeve 11, a force sensor 14, a press head seat 15 and a press head 16 to vertically move downwards, when a measuring tip of the press head 16 contacts the surface of the sample to be tested, a corresponding force value is generated on the force sensor 14, for Rockwell hardness measurement, the electronic circuit module 19 reads a position signal of the rotary coded disc 6-1 acquired by the coded disc reading head 6-2 according to the electric signals, the position signal represents the rotation angle of the micrometer screw 7, and then calculates the displacement of the pressure head 16, namely the depth value according to the known thread pair lead, so that the Rockwell hardness value of a sample to be measured can be calculated and displayed on the display 20, and then the motor 2 rotates reversely to return the pressure head 16 to a set position; for Brinell hardness measurement, the electronic circuit module 19 is only required to read a force value signal of the force sensor 14 and display the force value signal on the display 20, the pressure value is kept for 10 seconds after the specified test force value is reached, then the motor 2 is reversely rotated, the pressure head 16 is retracted to a set position, the hardness meter is taken down, the diameter of an indentation is measured by an optical instrument, and the Brinell hardness value is obtained through calculation.

Claims (9)

1. An electric portable hardness tester comprises a main frame (1), a motor (2), a micrometer screw (7), a micrometer nut (9), a sliding connecting sleeve (11), a shaft sleeve (13), a force sensor (14), a pressure head (16), an electronic circuit module (19), a display (20) and a battery (21), and is characterized in that the motor (2) is fixedly installed on the main frame (1), a first coupler (3) is fixedly installed on an output shaft of the motor (2), a first axial key groove (3-1) is formed in the outer cylindrical surface of the first coupler (3), a second coupler (5) is sleeved outside the first coupler (3), a first connecting key (4-1) is installed on the inner wall of the second coupler (5), and the first connecting key (4-1) can slide in the first axial key groove (3-1) of the first coupler (3), the sliding type micro-scale encoder is characterized in that the sliding type micro-scale encoder drives a second coupler (5) and a motor (2) to rotate at the same speed, a micro-scale screw (7) is fixedly installed at the lower end of the second coupler (5), a code disc installation seat (18) is further installed on the first coupler (3), a rotary code disc (6-1) composed of a code disc seat and a code disc is installed on the lower portion of the code disc installation seat (18), the rotary code disc (6-1) and the first coupler (3) rotate synchronously, a code disc reading head (6-2) is further installed on the main frame (1), and the code disc of the rotary code disc (6-1) is inserted into a reading notch of the code disc reading head (6-2).

2. The electric portable hardness tester according to claim 1, wherein an inner wedge-shaped groove (5-1) is formed in the lower end of the second coupling (5), an outer wedge-shaped protruding head (7-1) is formed in the upper end of the micrometer screw (7), an axial threaded hole is formed in the outer wedge-shaped protruding head (7-1), and the second coupling (5) and the micrometer screw (7) are connected with each other through the inner wedge-shaped groove (5-1) of the second coupling (5) and the outer wedge-shaped protruding head (7-1) of the micrometer screw (7) and are locked and fixed through a countersunk head screw (8) installed in the axial threaded hole.

3. An electric portable hardness tester according to claim 1 or 2, the main frame (1) comprises an upper platform (1-1) and a lower platform (1-3), an upper platform through hole (1-2) is arranged on the upper platform (1-1), a lower platform through hole (1-4) is arranged on the lower platform (1-3) corresponding to the upper platform through hole (1-2), the lower platform through hole (1-4) is a second-order stepped hole, a micrometer nut (9) is fixedly arranged in a first stepped hole of a lower platform through hole (1-4) formed on a lower platform (1-3) of the main frame (1), and a shaft sleeve (13) is fixedly arranged in a second step hole of a lower platform through hole (1-4) formed in a lower platform (1-3) of the main frame (1).

4. An electric portable hardness tester according to claim 1 or 2, wherein a recess is provided in the rear side of the lower end of the main frame (1), a power supply circuit board (23) is mounted in the recess, a battery holder (24) is mounted on the power supply circuit board (23), and a battery (21) is mounted in the battery holder (24).

5. An electric portable hardness tester according to claim 1 or 2, wherein the first coupling (3) is a T-shaped coupling, and a first axial keyway (3-1) is provided on the outer cylindrical surface of the first coupling (3) with a small diameter.

6. An electric portable hardness tester according to claim 1 or 2, wherein magnetic suction cups (17) are symmetrically installed on both sides of the lower end of the main frame (1).

7. An electric portable hardness meter according to claim 1, wherein the force sensor (14), display (20), code wheel reading head (6-2), battery (21) and motor (2) are connected to an electronic circuit module (19) respectively.

8. An electric portable hardness meter according to claim 7, wherein the battery (21) is connected to a power supply circuit board (23), and the battery (21) is connected to the motor (2) through the power supply circuit board (23).

9. An electric portable hardness tester according to claim 1 or 2, wherein a handle (25) is further mounted on the upper end of the main frame (1).

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