CN211317962U

CN211317962U - Pencil hardness tester

Info

Publication number: CN211317962U
Application number: CN201921568700.5U
Authority: CN
Inventors: 曾玉灵; 朱煜林; 曾赞根
Original assignee: Beiweisi Guangzhou Intelligent Technology Research Institute Co ltd
Current assignee: Beiweisi Guangzhou Intelligent Technology Research Institute Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-08-21
Anticipated expiration: 2029-09-19

Abstract

The utility model relates to a test technical field discloses a pencil sclerometer, it includes casing, controller, power, drive wheel, is used for the drive the driving motor of drive wheel with be used for control driving motor opens the control switch who stops, the drive wheel set up in the bottom side of casing, the drive wheel is connected driving motor's output, driving motor control switch with the power respectively with the controller electricity is connected, detachably is provided with the pencil on the casing, the nib of pencil is followed the casing bottom side is stretched out. The utility model provides a pencil sclerometer can avoid reducing the result influence that the human factor caused to the evaluation test, makes the hardness test have higher repeatability and reproducibility.

Description

Pencil hardness tester

Technical Field

The utility model relates to a test technical field especially relates to a pencil sclerometer.

Background

The pencil hardness tester is a mechanical device designed and manufactured according to national standards, and evaluates the hardness grade of a paint film by pressing a pencil with a known hardness grade on the paint film of a test sample to cause scratch-resistant and other defects on the surface of the paint film. During testing, the test sample plate is horizontally arranged, the included angle between a pencil fixed on the pencil hardness tester and the horizontal plane is 45 degrees, and the pressure of a pen point is 500g, 750g or 1000 g.

At present, when a tester uses a pencil hardness tester for testing, the tester pushes the pencil hardness tester with a hand to test. The force used was different for each individual pushing the pencil hardness timing, resulting in lower reproducibility of the test. Even if the same person completes a series of tests, it is difficult to ensure that the magnitude of the pushing force applied to the pencil hardness tester is exactly the same during each test. Therefore, such an operation of manually pushing the pencil hardness tester affects the test result, and the repeatability of the test is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: the pencil hardness tester can avoid the influence of human factors on the result of the evaluation test, and has higher repeatability and reproducibility of the hardness test.

In order to realize the above object, the utility model provides a pencil sclerometer, include casing, controller, power, drive wheel, be used for the drive the driving motor of drive wheel with be used for control driving motor opens the control switch who stops, the drive wheel set up in the bottom side of casing, the drive wheel is connected driving motor's output, driving motor control switch with the power respectively with the controller electricity is connected, detachably is provided with the pencil on the casing, the nib of pencil is followed the casing bottom side is stretched out.

Preferably, the driving wheel is arranged at the first end of the shell, the second end of the shell is provided with a pencil auxiliary mounting device, the pencil is located between the driving wheel and the pencil auxiliary mounting device, the pencil auxiliary mounting device comprises a sliding rod and an adjusting component, the sliding rod is slidably arranged at the second end of the shell in a penetrating mode along the vertical direction, and the adjusting component is adjusted to drive the sliding rod to extend out and retract along the bottom side of the shell.

As preferred scheme, the adjusting part includes slide, elastic element and the piece that resets that fixing base and level set up, fixing base fixed connection be in the casing, slide sliding connection be in the fixing base, elastic element's one end with one side inner wall butt of fixing base, elastic element's the other end with the first end butt of slide, it passes in proper order to reset the piece slidable the casing with the fixing base, and its one end butt is in the second end of slide, the slide bar passes slidable the fixing base with the slide, be equipped with on the slide bar with slide location fit's recess.

Preferably, the pencil auxiliary mounting device further comprises a limiting seat, the limiting seat is mounted at the bottom of the casing, a limiting hole for the sliding rod to pass through is formed in the limiting seat, and the sliding rod passes through the limiting hole and extends out of the bottom side of the casing.

Preferably, the sliding rod comprises a first rod body and a second rod body, and the second rod body is screwed at the bottom of the first rod body.

Preferably, a level monitoring device for detecting the levelness of the housing is arranged on the upper surface of the housing.

Preferably, the number of the driving wheels is two, and the driving wheels are respectively symmetrically arranged on two sides of the shell and are connected with the output end of the adjusting motor through a rotating shaft.

As the preferred scheme, the controller includes box body, display screen, the control unit and bee calling organ, the display screen with control switch all installs the upper surface of box body, the control unit with bee calling organ all installs in the box body, the control unit respectively with the display screen bee calling organ driving motor the power with control switch electricity is connected.

Preferably, the housing is provided with a positioning hole for inserting the pencil in an inclined manner, the pencil is inserted into the positioning hole, the housing is horizontally provided with a connecting hole, the positioning piece is inserted into the connecting hole, and the end of the positioning piece is abutted to the pencil. Locating piece

As preferred scheme, still include counter weight adjusting part, counter weight adjusting part includes backup pad, weight and regulating part, the backup pad horizontal installation in the casing, the weight is located in the backup pad, the regulating part with the weight respectively with casing detachably connects, the regulating part is through adjusting the weight is in position in the backup pad to the pressure size of change pencil nib.

The embodiment of the utility model provides a pencil sclerometer compares with prior art, and its beneficial effect lies in: the propelling force of using driving motor as pencil sclerometer for the drive wheel drives whole anterior sclerometer and removes, and the controller is connected with driving motor electricity, and steerable driving motor drives the drive wheel and rotates, has solved the problem that the test result that adopts the mode that the staff promoted the pencil sclerometer does not have repeatability and reproducibility.

Drawings

Fig. 1 is a perspective view of a pencil hardness tester provided by an embodiment of the present invention;

fig. 2 is a perspective view of a pencil hardness tester (not including a control device) provided in an embodiment of the present invention;

FIG. 3 is a longitudinal cross-sectional view of a pencil durometer provided by an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the pencil auxiliary mounting device provided by the embodiment of the present invention.

In the figure, 1, a housing; 2. a positioning member; 3. a drive wheel; 4. a drive motor; 5. a counterweight adjustment assembly; 51. a support plate; 52. a weight; 53. an adjustment member; 6. a pencil auxiliary mounting device; 61. a slide bar; 611. a first rod body; 612. a second rod body; 62. an adjustment assembly; 621. a fixed seat; 6211. a fixed seat body; 6212. a cover body; 622. a slide base; 623. an elastic element; 624. a reset member; 63. a limiting seat; 7. a groove; 8. a cavity; 9. a through hole; 10. a level monitoring device; 11. a limiting hole; 12. inner hexagon countersunk head screws; 13. countersunk head screws; 14. A motor fixing seat; 15. the charger is connected with a port; 16. a DC power input interface; 17. adjusting the through hole; 18. a connecting plate; 19. a box body; 20. positioning holes; 21. a pencil; 22. a control switch; 23. a display screen; 24. and (6) observing holes.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 4, the utility model provides a pencil sclerometer of preferred embodiment, it includes casing 1, a controller, a power supply, drive wheel 3, a control switch 22 that is used for driving drive wheel 3's driving motor 4 and is used for controlling driving motor 4 to open and stop, drive wheel 3 sets up in the bottom side of casing 1, driving motor 4, control switch 22 and power are connected with the controller electricity respectively, driving wheel 3 is connected at driving motor 4's output, detachably is provided with pencil 21 on the casing 1, the nib of pencil 21 stretches out along the casing 1 bottom side.

Based on above-mentioned technical scheme, drive wheel 3 installs in the bottom side of casing 1, and driving motor 4 and power are connected with the controller electricity respectively, and power and drive wheel 3 are connected with driving motor 4 electricity respectively, and controller control driving motor 4 drive wheel 3 rotates to drive whole pencil sclerometer and remove, need not adopt the mode that the manual work promoted the pencil sclerometer again to carry out the hardness test to the film, make the test result have effectual repeatability and reproducibility. The driving motor 4 can drive the driving wheel 3 to rotate through a transmission component, and the transmission component can be a worm gear or a gear transmission mechanism and the like.

Preferably, the driving wheel 3 is arranged at a first end of the housing 1, the second end of the housing 1 is provided with the auxiliary pencil mounting device 6, the pencil 21 is located between the driving wheel 3 and the auxiliary pencil mounting device 6, the auxiliary pencil mounting device 6 comprises a sliding rod 61 and an adjusting component 62, the sliding rod 61 is slidably arranged at the second end of the housing 1 in a penetrating manner along the vertical direction, and the adjusting component 62 drives the sliding rod 61 to extend out and retract along the bottom side of the housing 1. The pencil auxiliary mounting device 6 can be used for adjusting the included angle between the shell 1 and the horizontal plane, so that the whole pencil hardness tester tends to be horizontal, and a worker can conveniently mount the pencil 21 on the shell 1. The sliding rod 61 can move up and down in the shell 1, the top end of the sliding rod 61 protrudes out of the top surface of the shell 1, the bottom end of the sliding rod 61 protrudes out of the bottom side of the shell 1, a tester can make the sliding rod 61 protrude out of the bottom surface of the shell 1 through the adjusting component 62, so that the height of the driving wheel 3 protruding out of the shell 1 is the same as the height of the sliding rod 61 protruding out of the bottom of the shell 1, and the shell 1 is ensured to be on a horizontal line. The pencil 21 is then mounted in the housing 1 so that its tip extends out of the bottom of the housing, and the slide bar 61 is retracted by the adjustment assembly 62, with the housing 1 supported only by the drive wheel 3 and the pencil 21, whereupon the operator can open the control switch 22 to begin testing the paint film hardness.

Specifically, the adjusting assembly 62 includes a fixed seat 621, a sliding seat 622, an elastic element 623 and a reset element 624, the fixed seat 621 is fixedly connected in the housing 1, the sliding seat 622 is slidably connected in the fixed seat 621, one end of the elastic element 623 abuts against an inner wall of one side of the fixed seat 621, the other end of the elastic element 623 abuts against a first end portion of the sliding seat 622, the reset element 624 slidably penetrates through the housing 1 and the fixed seat 621 in sequence, one end of the reset element abuts against a second end portion of the sliding seat 622, the sliding rod 61 slidably penetrates through the fixed seat 621 and the sliding seat 622, and the sliding rod 61 is provided with at least one groove 7 which is in positioning fit with. The elastic element 623 and the reset element 624 can control the sliding seat 622 to move left and right in the fixed seat 621, so that the sliding seat 622 is clamped in any one of the grooves 7 or abuts against the outer wall of the sliding rod 61, and the sliding rod 61 is adjusted to move up and down in the housing 1, thereby achieving the effect of adjusting the height of the sliding rod 61 protruding out of the bottom surface of the housing 1. More specifically, the fixed seat 621 is provided with a cavity 8, and the sliding seat 622 can slide left and right in the cavity 8. The sliding seat 622 is provided with a through hole 9 with an inner diameter larger than that of the sliding rod 61, and the sliding rod 61 sequentially passes through the cavity 8 and the through hole 9. The middle part of the sliding rod 61 is provided with at least one groove 7, and each groove 7 is vertically arranged on the sliding rod 61. The reset piece 624 is a reset rod horizontally inserted in the middle of the housing 1, the cross section of the reset rod is in a T shape, the reset rod is connected with the elastic element 623 through the sliding seat 622, and the elastic element 623 can be adjusted to be in a compressed state or an extended state. The elastic member 623 is a spring, and in a non-use state, the spring is in a compressed state, and one end of the spring abuts against the left outer wall of the lower portion of the slide bar 61. The reset 624 and the slide 61 are both connected to the housing 1 in a pluggable manner. When the device is used, a tester presses the sliding rod 61, the groove 7 moves downwards along with the sliding rod 61 to the through hole 9, the spring moves rightwards under the influence of the elasticity of the spring and is clamped in the groove 7, so that the sliding rod 61 cannot move downwards continuously, and at the moment, the bottom of the sliding rod 61 protrudes out of the surface of the bottom of the shell 1 by a certain distance, so that the shell 1 is in a horizontal position. Pressing the piece 624 that resets, the piece 624 that resets moves left, drives slide 622 and spring and moves left, and the one end of slide 622 no longer the butt on recess 7 inner wall, and the spring is in compression state, and detection personnel can upwards lift slide bar 61 for the spring butt is on the outer wall of slide bar 61, and slide bar 61 resets, reaches the purpose of adjusting the levelness of pencil sclerometer. In this embodiment, the fixing base 621 includes a fixing base body 6211 and a cover body 6212, the fixing base body 6211 is screwed with the cover body 6212 through a countersunk head screw 13, and the cavity 8 is disposed in the fixing base body 6211.

Further, the upper surface of the housing 1 is provided with a level monitoring device 10 for detecting the levelness of the housing 1. The tester can judge whether the pencil hardness tester is in a horizontal state by observing the level monitoring device 10. In the present embodiment, the level monitoring device 10 is a level vial, and the housing 1 is on the horizontal line when the bubble inside the level vial is located at the center of the black circle.

More, the pencil auxiliary mounting device 6 further comprises a limiting seat 63, the limiting seat 63 is mounted at the bottom of the casing 1, a limiting hole 11 for the sliding rod 61 to pass through is formed in the limiting seat 63, and the bottom of the sliding rod 61 extends out of the bottom side of the casing 1 through the limiting hole 11. The limiting seat 63 is used for ensuring that the sliding rod 61 cannot be inclined when moving up and down. The limiting seat 63 is screwed on the bottom of the shell 1 through a hexagon socket countersunk head screw 12.

In particular, the sliding rod 61 is a telescopic rod. The length of the sliding rod 61 can be adjusted according to actual needs. The sliding rod 61 comprises a first rod 611 and a second rod 612, and the second rod 612 is screwed on the bottom of the first rod 611. The outer surface of the bottom of the first rod body 611 is provided with an external thread, and the second rod body 612 is provided with an internal thread hole which is in threaded fit with the external thread. The limiting hole 11 is a stepped hole, and the bottoms of the second rod 612 and the first rod 611 are both located in the limiting hole 11.

Further, the number of the driving wheels 3 is two, and each driving wheel 3 is respectively and symmetrically arranged on two sides of the shell 1 and is connected with the output end of the driving motor 4 through a rotating shaft, so that the shell 1 can move more stably on a paint film. The driving motor 4 is screwed at the bottom of the shell 1 through the motor fixing seat 14, the driving motor 4 can be a speed reducing motor, and the speed reducing motor is electrically connected with the control unit through a lead, so that a worker can remotely control the pencil hardness tester conveniently.

The controller includes box body 19, display screen 23, the control unit and bee calling organ, and display screen 23 and control switch 22 are all installed at the upper surface of box body 19, and the control unit and bee calling organ are all installed in box body 19, and the control unit is connected with display screen 23, bee calling organ, driving motor 4, power and control switch 22 electricity respectively. The box body 19 is provided with a charger connection port 15 and/or a DC power input interface 16 which can be externally connected with a DC or AC power supply to realize diversified power supply. The display screen 23 is a touch display screen, which has input and output functions, and a user can set the advancing or retreating of the pencil hardness tester by touching the display screen, and preset the distance and total time to be traveled by the pencil hardness tester. The control unit is a circuit board which is arranged in the box body 19 and can be a PLC system, a sensor can be further arranged on the circuit board, the distance and the time of the pencil hardness tester which has been moved can be measured through the rotating speed and the rotating number of turns of the driving wheel 3, information is fed back to the display screen 23, and the display screen 23 can display the distance, the time and the total distance and the time of the pencil hardness tester which has been moved. The buzzer has a prompting function, and after the test is finished, the control unit controls the buzzer to sound for about 30 seconds to prompt a user to observe scratches. The control switch 22 is a switch button, and the test is carried out after 5-10 seconds of delay after being pressed. The detection person turns on or off the drive motor 4 by pressing the switch button. The driving motor 4 is controlled by the control unit to drive the driving wheel 3 to rotate.

Preferably, the housing 1 is provided with a positioning hole 20 for inserting the pencil 21, the pencil 21 is inserted into the positioning hole 20, the housing 1 is horizontally provided with a connecting hole, the positioning member 2 is inserted into the connecting hole, and the end of the positioning member 2 abuts against the pencil 21. The angle between the positioning hole 20 and the horizontal plane is 45 degrees, and a pencil 21 can be inserted into the positioning hole. The positioning piece 2 comprises a hand wheel and a screw rod, the hand wheel is located on the outer side of the shell 1, and the hand wheel is fixedly connected with the first end portion of the screw rod. The connecting hole is a threaded hole, the screw rod is screwed in the threaded hole, and a tester rotates the screw rod to enable the screw rod to penetrate through the threaded hole and enable the second end portion (namely the end portion of the positioning part 2) of the screw rod to tightly push the pencil 21 in the positioning hole 20 so as to fix the position of the pencil 21.

The pencil sclerometer also comprises a balance weight adjusting component 5, the balance weight adjusting component 5 comprises a supporting plate 51, a weight 52 and an adjusting piece 53, the supporting plate 51 is horizontally arranged in the shell 1, the weight 52 is positioned on the supporting plate 51, the adjusting piece 53 and the weight 52 are respectively detachably connected with the shell 1, and the adjusting piece 53 is used for changing the pressure of the pen point of the pencil 21 by adjusting the position of the weight 52 on the supporting plate 51. The positioning adjustment assembly 5 is located at an end of the housing 1 remote from the positioning member 2. After the pencil 21 is inserted into the positioning hole 20, the pencil hardness tester is supported by the two driving wheels 3 and the three supporting points of the tip of the pencil 21. The support plate 51 is connected to the horizontally arranged connection plate 18 by screws, and the connection plate 18 is fixed in the housing 1 by screws. The weight 52 is located on the support plate 51, and in the use state, the weight 52 is fixed at a certain position on the support plate 51 through the adjusting member 53. The adjusting part 53 is a screw, the weight 52 is provided with a screw hole matched with the screw thread, the surface of the shell 1 is provided with a long strip-shaped adjusting through hole 17 arranged along the length direction of the shell 1, the adjusting through hole 17 is provided with a plurality of adjusting positions, and the screw penetrates through any adjusting position and is screwed in the screw hole. When the load of pencil sclerometer needs to be adjusted, the screw passes and adjusts through-hole 17 and connect on weight 52, through stirring regulating part 53, dials weight 52 to corresponding position on, through the position that changes the weight to change the focus position of pencil sclerometer, realize the pressure adjustment of pencil 21 nib, make the nib pressure of pencil 21 can be adjusted between 500g to 1000g in succession. The weight 5 is an iron block with weight scales on the upper surface and is U-shaped. The upper surface of the shell 1 is machined to form a viewing hole 24, the position of the viewing hole 24 corresponds to the position of the weight 52, and the scale value on the iron block can be seen through the viewing hole 24. One side of the viewing aperture 24 is provided with a pointed end. The adjustment member 53 is moved so that the weight moves along the length of the housing 1, and the scale on the weight 52 aligned with the tip is the value of the load borne by the tip of the pencil 21 at that moment.

The utility model discloses a working process does: the tester places the pencil hardness tester on the testing platform, presses the top of the slide bar 61 with the fingers until the pencil hardness tester does not move. During the pressing process, the sliding seat 622 moves downwards, the groove 7 moves downwards into the through hole 9, and the spring extends, so that one end of the sliding seat 622 is clamped in the groove 7, and the sliding rod 61 is clamped and does not move downwards any more. At this time, the bottom of the slide rod 61 extends to a height that allows the entire pencil durometer to be in a horizontal position with the bubble of the vial centered. The adjusting member 53 is unscrewed, the weight 52 is moved with the adjusting member 53 until the tip points to the weight value required by the test requirements, and the adjusting member 53 is tightened in the corresponding adjustment position to fix the position of the weight 52. The pencil 21 is inserted into the positioning hole 20, and the hand wheel is tightened, so that the positioning piece 2 pushes the pencil 21 tightly in the positioning hole 20. Pressing the reset member 624 moves the slide 622 to the left, with the spring in compression, and lifts the slide 61 upward, with the housing 1 supported only by the drive wheel 3 and the pencil 21. The power supply is connected to the charger connection port 15 or the DC power supply input interface 16, the control switch 22 is pressed, the power supply reaches the speed reducing motor through a connecting wire, and the control unit controls the speed reducing motor to be started after 5 seconds of delay. After the speed reducing motor rotates, the driving wheel 3 can be driven to rotate, so that the electric pencil hardness tester advances to start a hardness test. The user can set the distance traveled and the time of the pencil hardness meter via the display 23. After the test is finished, the control switch 22 is closed, and 30 seconds after the test is stopped, the control unit controls the buzzer to sound so as to remind a user to observe scratches generated by the test.

To sum up, the embodiment of the utility model provides a pencil sclerometer, it uses driving motor as the driving force of pencil sclerometer for the drive wheel drives whole anterior sclerometer and removes, and the controller is connected with the driving motor electricity, and steerable driving motor drives the drive wheel and rotates, has solved the problem that the test result that the mode that adopts the staff to promote the pencil sclerometer leads to does not have repeatability and reproducibility.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a pencil sclerometer, its characterized in that includes casing, controller, power, drive wheel, is used for the drive the driving motor of drive wheel and be used for controlling driving motor opens the control switch who stops, the drive wheel set up in the bottom side of casing, the drive wheel is connected driving motor's output, driving motor control switch with the power respectively with the controller electricity is connected, detachably is provided with the pencil on the casing, the nib of pencil is followed the casing bottom side is stretched out.

2. The pencil hardness meter of claim 1, wherein the driving wheel is disposed at a first end of the housing, the second end of the housing is provided with a pencil auxiliary mounting device, the pencil is located between the driving wheel and the pencil auxiliary mounting device, the pencil auxiliary mounting device includes a sliding rod slidably disposed at the second end of the housing along a vertical direction, and an adjusting assembly is adjusted to drive the sliding rod to extend and retract along a bottom side of the housing.

3. The pencil sclerometer of claim 2, wherein the adjustment assembly includes a fixed seat, a horizontally disposed slide, an elastic element, and a reset member, the fixed seat is fixedly connected in the housing, the slide is slidably connected in the fixed seat, one end of the elastic element abuts against an inner wall of one side of the fixed seat, the other end of the elastic element abuts against a first end of the slide, the reset member slidably penetrates through the housing and the fixed seat in sequence, and one end of the reset member abuts against a second end of the slide, the slide slidably penetrates through the fixed seat and the slide, and a groove is formed in the slide and is in positioning fit with the slide.

4. The pencil hardness meter according to claim 2, wherein the pencil auxiliary mounting device further comprises a limiting seat, the limiting seat is mounted at the bottom of the casing, a limiting hole for the sliding rod to pass through is formed in the limiting seat, and the sliding rod passes through the limiting hole and extends out of the bottom side of the casing.

5. The pencil durometer of claim 2 wherein the slide comprises a first shaft and a second shaft, the second shaft being threaded into the bottom of the first shaft.

6. The pencil durometer of claim 1 wherein the upper surface of the housing is provided with a level monitoring device for detecting the levelness of the housing.

7. The pencil hardness meter according to claim 1, wherein the number of the driving wheels is two, and the driving wheels are respectively symmetrically arranged on both sides of the housing and connected with the output end of the driving motor through a rotating shaft.

8. The pencil sclerometer according to claim 7, wherein the controller includes a box body, a display screen, a control unit and a buzzer, the display screen and the control switch are both mounted on the upper surface of the box body, the control unit and the buzzer are both mounted in the box body, and the control unit is electrically connected with the display screen, the buzzer, the driving motor, the power supply and the control switch respectively.

9. The pencil hardness tester according to claim 1, wherein a positioning hole for inserting the pencil is obliquely formed in the housing, the pencil is inserted into the positioning hole, a connecting hole is horizontally formed in the housing, a positioning member is inserted into the connecting hole, and an end of the positioning member abuts against the pencil.

10. The pencil hardness tester of claim 1, further comprising a balance weight adjusting assembly, wherein the balance weight adjusting assembly comprises a supporting plate, a weight and an adjusting piece, the supporting plate is horizontally installed in the casing, the weight is located on the supporting plate, the adjusting piece and the weight are respectively detachably connected with the casing, and the adjusting piece is used for changing the pressure of the pencil point by adjusting the position of the weight on the supporting plate.