CN212872044U

CN212872044U - Force measuring tool capable of conducting pencil experiment on curved surface

Info

Publication number: CN212872044U
Application number: CN202021443454.3U
Authority: CN
Inventors: 王永雷; 魏晨光; 李传明
Original assignee: Citic Dicastal Co Ltd
Current assignee: Citic Dicastal Co Ltd
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2021-04-02
Anticipated expiration: 2030-07-21

Abstract

The utility model discloses a can carry out dynamometry instrument of pencil experiment at curved surface, including set screw, scale piece set screw, dynamometry spring, steel scale piece, scale piece guide screw, application of force handle, 45 pencil chuck and fixed pin, place the pencil in 45 pencil chuck during use to through pencil set screw locking, the handle with 45 pencil chuck passes through the fixed pin and articulates together to can rotate, place the pencil point in paint the surface and compress the dynamometry spring when pressing down application of force handle, by the steel scale piece that scale piece set screw fixed can slide at the upper surface of application of force handle under scale piece guide screw's guide, through the position of calibration scale piece under standard pressing force, press to the calibration position during the use and can test. The utility model discloses can realize carrying out pencil paint film hardness test on complicated curved surface, simple structure is reliable simultaneously, processing simple manufacture, the processing is easy, and application scope is wide.

Description

Force measuring tool capable of conducting pencil experiment on curved surface

Technical Field

The utility model relates to a test field of painting coating hardness is tested with the pencil method, mainly to the paint film hardness of non-horizontal plane, specifically speaking is a dynamometry instrument that can carry out the pencil experiment at the curved surface.

Background

In the test for measuring the hardness of paint coating, there is a test method using pencil scratch and a special test tool, and the test method is that a pencil of a specified type is placed on a specified test tool and a test is performed on a horizontal paint surface. But the complicated paint surface often appears in the actual conditions, for example the surface of automobile wheel hub, because the molding is changeable to mostly be the curved surface, the horizontally surface is few and the area is less, can't place dedicated test tool, therefore we need a dedicated pencil test tool that can measure complicated curved surface. This patent provides a dynamometry instrument that can carry out the pencil experiment at the curved surface based on this current situation.

Disclosure of Invention

The utility model aims at providing a can carry out the dynamometry instrument that the pencil was tested at the curved surface, can realize carrying out pencil paint film hardness test on complicated curved surface, simple structure simultaneously, the easy operation.

In order to realize the purpose, the technical scheme of the utility model is that:

a force measuring tool capable of conducting a pencil experiment on a curved surface comprises fixing screws, scale sheet fixing screws, a force measuring spring, a steel scale sheet, scale sheet guide screws, a force application handle, a 45-degree pencil chuck and fixing pins, wherein 2 fixing screws are arranged at the top of the 45-degree pencil chuck and used for fixing a pencil, the scale sheet fixing screws are arranged on the side portion of the 45-degree pencil chuck, and the fixing screws, the scale sheet fixing screws and the 45-degree pencil chuck form a clamping end of the force measuring tool; the scale sheet guide screw is arranged on the side part of the force application handle, and the scale sheet guide screw and the force application handle form a handheld end of the force measurement tool; the clamping end and the handheld end are connected through a fixing pin; two ends of the steel scale plate are respectively connected with the scale plate fixing screw and the scale plate guide screw, and two ends of the force measuring spring are respectively connected into the 45-degree pencil chuck and the force application handle.

In one or more embodiments, a protruding pillar is arranged at the lower right of the 45 ° pencil holder for installing a fixing pin, the head of the pillar is circular and is provided with a hole with a diameter slightly larger than that of the fixing pin, and the thickness of the pillar is about one third of that of the 45 ° pencil holder; the left lower side of the force application handle is provided with a protruding semicircular structure, the center of the semicircular structure is provided with a hole with the diameter the same as that of the fixing pin, the middle position of the left side of the force application handle is provided with a groove, the width of the groove is the same as that of the support column, and the depth of the groove is basically the same as that of the semicircular structure.

In one or more embodiments, the 45 ° pencil chuck right lower pillar is in clearance fit with the middle groove in the left side of the force application handle, the fixing pin is in clearance fit with the round hole at the head of the 45 ° pencil chuck right lower pillar, and the fixing pin is in interference fit with the round hole at the center of the force application handle left lower semicircular structure.

In one or more embodiments, the vertical distance between the force measuring spring and the fixing pin is 10mm-15 mm.

In one or more embodiments, the spring constant of the load spring is no greater than 20N/mm.

In one or more embodiments, the 45 ° pencil grip has an inner diameter of 5.3mm to 5.5 mm.

In one or more embodiments, the gap between the 45 ° pencil grip and the force application handle is in the range of 8mm to 10 mm.

In one or more embodiments, the steel scale plate is not right-angled, a gap of 1mm-2mm is formed between the front left half section of the steel scale plate and the force application handle, and the clamping end and the handheld end limit the rotation angle through the steel scale plate.

In one or more embodiments, the set screw, the scale plate set screw, and the scale plate guide screw have dimensions M4-M6.

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

compared with the traditional pencil experiment tool, the force measuring tool can realize the pencil paint film hardness test on a complex curved surface, is simple and reliable in structure, simple to process and manufacture, easy to operate and wide in application range, can be suitable for a horizontal plane like a common pencil test, and can also be applied to a complex curved surface.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application and should not be construed as unduly limiting the present application.

FIG. 1 is a schematic diagram of a conventional pencil test tool.

FIG. 2 is a schematic view of a force measuring tool for pencil tests on curved surfaces according to the present application.

FIG. 3 is a cross-sectional view of a force measuring tool of the present application that can perform a pencil test on a curved surface.

In the figure: the pencil comprises a pencil 1, a fixing screw 2, a scale fixing screw 3, a force measuring spring 4, a steel scale 5, a scale guide screw 6, a force applying handle 7, a pencil chuck of 8-45 degrees and a fixing pin 9.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The force measuring tool provided by the present invention is explained below with reference to fig. 2 to 3.

Example 1:

a force measuring tool capable of conducting a pencil experiment on a curved surface comprises fixing screws 2, scale piece fixing screws 3, a force measuring spring 4, a steel scale piece 5, scale piece guide screws 6, a force application handle 7, a 45-degree pencil chuck 8 and fixing pins 9, wherein 2 fixing screws 2 are mounted at the top of the 45-degree pencil chuck 8 and used for fixing a pencil 1, the scale piece fixing screws 3 are mounted on the side portion of the 45-degree pencil chuck 8, and the fixing screws 2, the scale piece fixing screws 3 and the 45-degree pencil chuck 8 form a clamping end of the force measuring tool; the scale sheet guide screw 6 is arranged on the side part of the force application handle 7, and the scale sheet guide screw 6 and the force application handle 7 form a handheld end of the force measuring tool; the clamping end and the handheld end are connected through a fixing pin 9; two ends of the steel graduated sheet 5 are respectively connected with the graduated sheet fixing screw 3 and the graduated sheet guide screw 6, and two ends of the force measuring spring 4 are respectively connected into the 45-degree pencil chuck 8 and the force application handle 7.

An extended support is arranged at the lower right of the 45-degree pencil chuck 8 and used for mounting a fixing pin 9, the head of the support is round and is provided with a hole with the diameter slightly larger than that of the fixing pin 9, and the thickness of the support is about one third of that of the 45-degree pencil chuck 8; the left lower side of the force application handle 7 is provided with a protruding semicircular structure, the center of the semicircular structure is provided with a hole with the diameter the same as that of the fixing pin 9, the middle position of the left side of the force application handle 7 is provided with a groove, the width of the groove is the same as that of the support column, and the depth of the groove is basically the same as that of the semicircular structure.

Recess clearance fit in the middle of 45 pencil chuck 8 right side below pillar and application of force handle 7 left side, the round hole clearance fit of fixed pin 9 and 45 pencil chuck 8 right side below pillar head, the round hole interference fit at fixed pin 9 and application of force handle 7 left side below semicircular structure center. The vertical distance between the force measuring spring 4 and the fixing pin 9 is 10mm-15mm, the elastic coefficient of the force measuring spring 4 is not more than 20N/mm, the inner diameter of the 45-degree pencil chuck 8 is 5.3mm-5.5mm, and the gap between the 45-degree pencil chuck 8 and the force application handle 7 is within the range of 8mm-10 mm. The steel scale 5 is not in a right-angle shape, a gap of 1mm-2mm is formed between the front left half section of the steel scale and the force application handle 7, and the rotation angle of the clamping end and the handheld end is limited by the steel scale 5. The fixing screw 2, the scale plate fixing screw 3 and the scale plate guide screw 6 have the size of M4-M6.

In actual work, a support of a 45-degree pencil chuck 8 is inserted into a groove in the middle of the left side of a force application handle 7, a central hole is inserted into a fixing pin 9, the fixing pin is hinged together and can rotate freely, a force measurement spring 4 in the middle is used for forming pressing reaction force, and a steel scale 5 is used for measuring and limiting reverse rotation of a clamping end.

When the force application handle 7 of the hand tool is pressed downwards, due to the certain distance between the force measuring spring 4 and the fixed pin 9, therefore, a bending moment taking the fixed pin 9 as a fulcrum can be formed, the bending moment acts on the force measuring spring 4 to form a certain pressure, so that the force measuring spring 4 is compressed, the 45-degree pencil chuck 8 rotates clockwise and forms a certain included angle with the force application handle 7, the steel scale 5 can rotate along with the 45-degree pencil chuck 8 simultaneously, however, since the steel scale 5 will move horizontally along the upper surface of the force application handle 7 and point to different scale values of the scale mark due to the limitation of the scale guide screw 6, pressure calibration is required before use to record the corresponding scale values under different pressures, and the extending lengths of the pencils 1 must be ensured to be the same value and between 45mm and 50mm during use and calibration, otherwise the accuracy of measurement will be affected.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. The utility model provides a can carry out dynamometry instrument of pencil experiment at curved surface, includes set screw (2), scale piece set screw (3), dynamometry spring (4), steel scale piece (5), scale piece guide screw (6), application of force handle (7), 45 pencil chuck (8) and fixed pin (9), its characterized in that: the 2 fixing screws (2) are arranged at the top of the 45-degree pencil chuck (8) and used for fixing the pencil (1), the scale sheet fixing screws (3) are arranged on the side part of the 45-degree pencil chuck (8), and the fixing screws (2), the scale sheet fixing screws (3) and the 45-degree pencil chuck (8) form a clamping end of the force measuring tool; the scale sheet guide screw (6) is arranged on the side part of the force application handle (7), and the scale sheet guide screw (6) and the force application handle (7) form a handheld end of the force measuring tool; the clamping end and the handheld end are connected through a fixing pin (9); two ends of the steel scale plate (5) are respectively connected with the scale plate fixing screw (3) and the scale plate guide screw (6), and two ends of the force measuring spring (4) are respectively connected into the 45-degree pencil chuck (8) and the force application handle (7).

2. The force measuring tool for pencil experiments on curved surfaces as claimed in claim 1, wherein: the pencil holder is characterized in that a support column extending out is arranged at the lower right side of the 45-degree pencil holder (8) and used for mounting a fixing pin (9), the head of the support column is circular and is provided with a hole with the diameter slightly larger than that of the fixing pin (9), and the thickness of the support column is about one third of that of the 45-degree pencil holder (8); the left lower side of the force application handle (7) is provided with a protruding semicircular structure, the center of the semicircular structure is provided with a hole with the diameter the same as that of the fixing pin (9), the middle position of the left side of the force application handle (7) is provided with a groove, the width of the groove is the same as that of the support column, and the depth of the groove is basically the same as that of the semicircular structure.

3. The force measuring tool for pencil experiments on curved surfaces as claimed in claim 2, wherein: recess clearance fit in the middle of 45 pencil chuck (8) below right side pillar and application of force handle (7) left side, the round hole clearance fit of fixed pin (9) and 45 pencil chuck (8) below right side pillar head, the round hole interference fit at fixed pin (9) and application of force handle (7) below left side semicircular structure center.

4. The force measuring tool for pencil experiments on curved surfaces as claimed in claim 1, wherein: the vertical distance between the force measuring spring (4) and the fixing pin (9) is 10mm-15 mm.

5. The force measuring tool for pencil experiments on curved surfaces as claimed in claim 4, wherein: the elastic coefficient of the force measuring spring (4) is not more than 20N/mm.

6. The force measuring tool for pencil experiments on curved surfaces as claimed in claim 1, wherein: the inner diameter of the 45-degree pencil chuck (8) is 5.3mm-5.5 mm.

7. The force measuring tool for pencil experiments on curved surfaces as claimed in claim 1, wherein: the gap between the 45-degree pencil chuck (8) and the force application handle (7) is within the range of 8-10 mm.

8. The force measuring tool for pencil experiments on curved surfaces as claimed in claim 1, wherein: the steel scale piece (5) is not in a right-angle shape, a gap of 1mm-2mm is formed between the front left half section of the steel scale piece and the force application handle (7), and the clamping end and the handheld end limit the rotation angle through the steel scale piece (5).

9. The force measuring tool for pencil experiments on curved surfaces as claimed in claim 1, wherein: the size of the fixing screw (2), the scale plate fixing screw (3) and the scale plate guide screw (6) is M4-M6.