KR20110123365A - Dynamics experiment equipment using pushpull gauge - Google Patents

Dynamics experiment equipment using pushpull gauge Download PDF

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Publication number
KR20110123365A
KR20110123365A KR1020100042804A KR20100042804A KR20110123365A KR 20110123365 A KR20110123365 A KR 20110123365A KR 1020100042804 A KR1020100042804 A KR 1020100042804A KR 20100042804 A KR20100042804 A KR 20100042804A KR 20110123365 A KR20110123365 A KR 20110123365A
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South Korea
Prior art keywords
mass
push pull
pull gauge
test
force
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KR1020100042804A
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Korean (ko)
Inventor
임재희
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주식회사 서울과학기기
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Priority to KR1020100042804A priority Critical patent/KR20110123365A/en
Publication of KR20110123365A publication Critical patent/KR20110123365A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/06—Measuring force or stress, in general by measuring the permanent deformation of gauges, e.g. of compressed bodies
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Algebra (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • Theoretical Computer Science (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

PURPOSE: Dynamics experiment equipment using a push pull gauge is provided to reduce an experiment time and improve the accuracy of an experiment using a push pull gauge. CONSTITUTION: A push pull gage(20) is connected to the upper end of one side of an experiment board(10) through a fixing part. An inclined plane(42) is attached to the center of the experiment board. A fixing member(32) for changing a direction is attached to the experiment board between the incline plane and the push pull gage. A rotary mass body(54) or a mass weight and a hooked connector are connected by a string(62). The string passes by the fixing member for changing the direction. The rotary mass body or the mass weight is placed in the incline plane for the experiment. The angle of the inclined plane is changed, a test value appears in the display window of the push pull gage, and force to the inclined plane is measured.

Description

Mechanical test device using push pull gauge {DYNAMICS EXPERIMENT EQUIPMENT USING PUSHPULL GAUGE}

The present invention relates to a mechanical test apparatus using a push pull gauge, and, compared with the conventional method, improves the experimental accuracy by reducing the experimental error, and can shorten the experiment time. It is about.

In general, the conventional mechanical test apparatus, as shown in Figure 1, by using the spring balance 100 to measure the length, or by using a mass weight to measure the weight (F) while varying the weight of the mass weight. However, the length of the spring was not constant, or due to the shaking of the spring, there was a high possibility that an error occurred in the length measurement. In addition, in order to measure the force by the spring, a separate experiment for calculating the spring constant (elastic coefficient) k was required.

In addition, in the case of a torque (rotational force) experiment or an experiment to find the center of mass, when a weight is generated by hanging a weight at one end of the shaft in a conventional experimental method, various forces are required to balance the force according to the change in the position of the shaft. Mass addition of mass was necessary, and without the mass addition, it was not possible to reflect the slight difference in weight. When using the conventional spring balance, it was difficult to measure the compression force properly, and as a result, accurate experiment was virtually impossible and delayed the experiment time. Of course, the error occurred greatly in the experiment.

In addition, when the teacher performs the experiment alone in the classroom in front of the classroom, the entire class has difficulty in observing the experiment, and a separate experiment apparatus is required for each experiment table, and thus the necessity of a set of experiment apparatuses can be performed. This has risen.

In response to this demand, many experimental instruments have been developed, one of which is Korean Patent No. 249626 and Korean Patent No. 535246.

The Korean Patent No. 249626 (mechanical experiment set) can reduce the occurrence of errors by fixing the inclined surface in the case of the experiment using the inclined surface, various experiments are possible, but using a spring balance, etc., to measure the increased length In this case, the error is large and the accuracy of the experiment is reduced, and the problem of delaying the experiment time still remains.

In addition, the Republic of Korea Patent No. 535246 (multipurpose physics testing apparatus) has been improved to facilitate the experiment demonstration of the teacher using a magnetic blackboard, but like the former, the possibility of experiment error in measuring the magnitude of the force, etc. The problem is intact.

Accordingly, the present invention is to solve the problems of the prior art as described above, by measuring the force by using a push-pull gauge digitally measured during the mechanical test, to reduce the error to improve the experimental accuracy, shorten the experiment time An object of the present invention is to provide a mechanical test apparatus using a push pull gauge.

In addition, the present invention is easy to demonstrate in the test plate, using a variety of test parts, to provide a dynamic test device using a push pull gauge that can be easily, fast, and accurate experiments to another object.

In order to achieve the above object, the mechanical test device using the push pull gauge according to the present invention is a mechanical test device including a test plate, a holding member, a mass member, a test apparatus and a force measuring device, the test plate is a magnet It can be attached to the test parts, and the board board can be used as a marker, the fixing member and the test apparatus is attached to the magnet to be detachable to the test plate, the force measuring device is fixed to one side of the test plate It is characterized in that the push pull gauge for digitally measuring the force by the mass member or the test apparatus.

In addition, the mechanical test apparatus using a push pull gauge according to the present invention is fixed to the push pull gauge connected to the hook-type connector on the upper side of the test plate, attaching the inclined surface to the center of the test plate, the push pull gauge Attaching the direction change fixing member to the test plate between the and the inclined surface, and placing the rotating mass or the mass weight connected to the hook type connector and the string passing through the direction fixing member on the inclined surface, and the inclined surface By varying the angle of the by measuring the force appearing on the display window of the push pull gauge, the force acting in the direction of the inclined surface is characterized in that the experiment.

In addition, the mechanical test apparatus using a push pull gauge according to the present invention is fixed to the push pull gauge connected to the conical connector or the A-type connector through the expansion rod on the upper side of the test plate, the conical connector or the A Attaching the position recognition fixing member to the test plate at a position spaced from the connector, and contacting the lower end of the intermediate part with the position recognition fixing member, and allowing one side upper end to contact the conical connector or the A connector; On the other side, the mass bar is installed by hanging the mass weight with a string, and the average stand is installed, and the position recognition fixing member or the position of the mass weight is changed while the average weight level is maintained, and the display of the push pull gauge is displayed. By measuring the force appearing on the window, it is possible to measure the force acting in the vertical direction of the It characterized in that the torque experiment.

As described above, the dynamic test device using the push pull gauge according to the present invention is easier to measure the force than the case of measuring the force using a spring balance or mass weight in the prior art to greatly improve the accuracy of the experiment by reducing the error Can shorten the experiment time.

In addition, the push pull gauge used in the present invention is provided with a fixing means that can be fixed to one side of the test plate, to facilitate the experiment demonstration on the test plate, the torque test, the inclined surface was difficult in the prior art Easier and more accurate experiments can be conducted.

In addition, by using a variety of fixing members and the like used in the present invention, it is possible to easily, accurately and quickly perform a variety of experiments.

1 shows a conventional mechanical test apparatus.
Figure 2 shows a perspective view of a push pull gauge used in the present invention.
Figure 3 shows the components for the measuring head of the push pull gauge used in the present invention.
4 shows Example 1 of the present invention.
5 shows a second embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of a mechanical test apparatus using a push pull gauge according to the present invention will be described in detail.

The test plate 10 used in the mechanical test apparatus of the present invention is an iron board or a board made of a plastic material containing an iron component, to which an experimental part with a magnet can be attached, and to write on the test board with a board marker. .

The push-pull gauge 20 used in the mechanical test apparatus of the present invention is a gauge that can measure the compression force (push) and pull force (digital) by digitization, the force measurement compared to the case of using a conventional spring balance or mass weight It is easy and accurate, and can reduce the error compared with the conventional mechanical test, and the experiment time can be shorter than when using the spring balance or mass weight.

The push pull gauge, as shown in Figure 2, the main body 22 having a display window on the front, the fixing means 24 and the measuring head for attaching to one side to the test plate 10 of the rear of the main body 22 3, the main body 22 has a display window, the compressive force is expressed as a digitized value as (-), the tensile force as (+), and the magnitude of the force is also kgf, N, Lbf And so on, the measurement is very accurate and easy, can be quickly performed, and the accuracy and efficiency of the experiment can be maximized.

One side lower end of the main body 22 is provided with a measuring shaft 28, the measuring shaft 28 is a portion for detecting the compressive force and the tensile force. A measuring head accessory (FIG. 3) is connected to the measuring shaft 28.

As shown in FIG. 3, the measuring head accessory includes a hook-type connector (a), a balanced connector (b), a conical connector (c), a V-type connector (d), an A-type connector (e), and an extension rod ( f), the extension rod (f) is used for extending the length, the hook-type connector (a), balanced connector (b), conical connector (c), V-shaped connector ( d), can be used to connect one of the A-type connector (e), it may be connected to the main body 22 without the extension rod (f).

Here, the hook-type connector (a) is mainly used for hanging the straps, etc. on the hook, and the conical connector (c) and the A-type connector (e) is pointed at the end is useful for reading the scale during the experiment Can be used.

The fastening means 24, as shown in Figure 2, is attached to the back of the main body 22 with a screw or the like hook (26) is formed with a groove (26) opened downward to be fixed to the test plate 10 24a) and a fastening screw 24b which is screwed into the lower end of the rear of the hook and protrudes into the groove 26, and is easily fixed and attached to any one side regardless of the thickness of the test plate 10. You can do it.

Fixing members (32, 34) used in the mechanical testing device of the present invention is attached to the magnet can be fixed to the test plate 10 and the position is easy to move a variety of experiments.

There are various kinds of the fixing member according to the function and shape, and among them, the position change fixing member 32 for changing the direction of the force applied to the mass members 52 and 54 and the position of the test apparatus are recognized. There is a position recognition fixing member 34.

The direction change fixing member 32, as shown in Figure 4, as a disk-shaped pulley formed with a groove on the edge may be used that has a bearing in the center.

On the other hand, the position recognition fixing member 34, as shown in Figure 5, to facilitate the reading of a specific position (reference) of the object to be supported may be used having a triangular projection.

Experimental instruments used in the dynamics test apparatus of the present invention include a protractor and an additionally inclined surface 42 or a graduated average balance 44.

The inclined surface 42 has a small weight and a protractor so as to know the inclination angle, and the average table 44 has a scale, so that the position measurement fixing member 34 facilitates scale measurement.

The mass member used in the mechanical test apparatus of the present invention may use any one of a mass weight 52 having a specific mass, a rotating mass that can be rotated or rolled, and a planar mass 56 that is not rotatable in plane. .

The mass weight 52 is 5g, 10g, 15g, 20g,... Has a specific mass, such as 100g, there is a ring can be suspended on the string, or as shown in Figure 5, can be used to hang on a separate mass hanger (52a) in a cylindrical hole in the center.

The rotating mass 54 has a bracket (54a) to act in both directions, when the force in one direction to ensure that the bracket is equilibrated with respect to the center of mass so that the force is not dispersed.

The planar mass 56 may be used in the case of measuring the center of mass in a planar shape that does not rotate as a plane of thin thickness.

Hereinafter, an example in which a mechanical test apparatus using the push pull gauge is used in an actual experiment will be described in detail.

Example 1 Force Component Test on Slope

1. Experimental Equipment

To this end, as shown in Figure 4, the test plate 10, push-pull gauge 20, hook-type connector (Fig. 3 (a)), the direction switching fixing member 32, inclined surface 42, rotating mass 54 ), A mass weight 52, a string 62, or the like.

2. Experimental method

First, as shown in Figure 4, to secure the push-pull gauge 20 is connected to the hook-type connector (Fig. 3 (a)) through the fixing means 24 on one side of the test plate 10, the center of the test plate 10 The inclined surface 42 is attached to, and the direction change fixing member 32 is attached to the test plate 10 between the push-pull gauge 20 and the inclined surface 42.

Subsequently, the rotating mass 54 or the mass weight 52 and the hook-shaped connector (a) are connected with the string 62, and then the string 62 passes through the direction changing fixing member 32 and the rotation is performed. When the mass 54 or the mass 52 is placed on the inclined surface 42, the experimental setting is completed.

After setting the experiment as described above, by measuring the force appearing on the display window of the push pull gauge 20 while varying the angle of the inclined surface 42, the force acting in the inclined surface direction (direction parallel to the inclined surface) can be tested. Can be.

The force Wx in the inclined plane direction measured by the push pull gauge 20 depends on the angle of the inclined plane 42, which can be easily contrasted with a theoretical value of Equation 1 below.

Equation 1 W x = Wsinθ

Therefore, in the above experiment, the weight W (= mg) of the object on the inclined surface 42 is divided into the component weight Wx in the direction parallel to the inclined surface and the component Wy in the parallel direction perpendicular to the inclined surface, as shown in FIG. Understand that you can lose.

In addition, by measuring the component force Wx with the push-pull gauge 20 and measuring the angle of the inclined surface 42 with the weight 42a attached to the inclined surface 42 and the protractor 42b, by W = Wx / sinθ We can also calculate the weight of the weight inversely.

The push pull gauge 20, as shown in Figure 4, may be installed on the upper side of the test plate 10, by directly attaching to the side surface of the test plate 10 so that the string 62 is parallel to the inclined surface (42) May be used. In the latter case, there is an advantage that the direction switching fixing member 32 is unnecessary, but there is an inconvenience in that the push-pull gauge 20 must be reinstalled each time the angle of the inclined surface 42 is changed.

Example 2 Torque Experiment

1. Experimental Equipment

To this end, as shown in Figure 5, the test plate 10, push-pull gauge 20, expansion rod (Fig. 3 (f)), conical connector (Fig. 3 (c)) or A type connector (Fig. 3 (e)) ], The position-aware fixing member 34, the average stage 44, the mass weight 52, the string 64, etc. are required.

2. Experimental method

First, as shown in FIG. 5, the measuring rod of the push pull gauge 20 is connected to an extension rod [FIG. 3 (f)] to which a conical connector [FIG. 3 (c)] or an A connector (FIG. 3 (e)) is connected. 28) and the push pull gauge 20 is mounted on the upper side of the test plate 10 through the fixing means 24, and then the test plate 10 at a position spaced apart from the conical connector or the A connector. Attach the position recognition fixing member 34 to.

Subsequently, the lower portion of the intermediate portion is in contact with the position recognition fixing member 34, and the upper end of the one side is in contact with the conical connector or the A-type connector, and the other side is suspended by the mass weight 52 with a string 64. When the average stage 44 is installed so that the level is maintained, the experimental setting is completed.

After setting the experiment as described above, the position of the position-aware fixing member 34 or the mass weight 52 is changed in the state in which the average balance 44 is maintained on the display window of the push-pull gauge 20. By measuring the force appearing, a torque test is performed by measuring the force acting in the vertical direction of the average band 44.

Since torque is a directional rotational force, it is expressed as a vector as shown in Equation 2 below (the bolt body of the letter is a vector amount).

Equation 2 t = r × F

By the way, in the above experiment, when the average stage 44 is in a state where the position recognition fixing member 34 is not rotated by rotating as the rotation axis, the total torque t total acting on the average stage 44 is represented by Equation 3 below. Becomes the same as

Equation 3 t total = r 1 × F 1 + r 2 × F 2 + r 3 × F 3 = 0

Here, r 1 is the distance from the position recognition fixing member 34, which is the rotation axis, to the point where the conical connector or the A connector is in contact, and F 1 is the vertical force (push pull) acting on the conical connector or the A connector. Force measured by gauge).

And, r 2 is the distance from the position recognition fixing member 34 to the place where the mass weight 52 is suspended, F 2 is the force by the weight of the mass weight (52).

And, r 3 is the distance from the position-recognition fixing member 34 to the center of mass (CM) of the average balance 44, F 3 is the force by the weight of the average balance 44.

Therefore, F 1 , which is the force measured by the push pull gauge, may be calculated from Equation 3 as shown in Equation 4 below.

Equation 4 F 1 = [(r 2 F 2 )-(r 3 F 3 )] / r 1 (direction: vertical upward direction)

This acts as a compressive force on the push pull gauge (20).

In the same manner as described above, in accordance with the position change of the position recognition fixing member 34, that is, the position change of the rotating shaft, r 1 , r 2 , By varying the value of r 3 or by changing only the position of the mass weight 52, only r 2 is measured and the force appearing on the display window of the push-pull gauge 20 is measured and compared with the theoretical value according to Equation 4 above. By doing so, it is possible to understand the concept of torque.

The torque test as described above is an effect of being able to accurately measure the compression force by the push pull gauge (20). That is, the experiment is impossible with the conventional spring balance.

As described above, the embodiments of the present invention have been described in detail, but since the embodiments have been described so that those skilled in the art to which the present invention pertains may easily implement the present invention, Therefore, the technical spirit of the present invention should not be limitedly interpreted.

10: Trial 20: Push Pull Gauge
22: main body 24a: hook
24b: Tightening Screw 26: Groove
28: measuring shaft 32: direction fixing member
34: fixed position member 42: inclined surface
44: average band 52: mass weight
54: rotating mass 56: planar mass
62, 64: string

Claims (8)

A mechanical test device including a test plate, a fixed member, a mass member, an experiment apparatus, and a force measuring device,
The test board is attached to the experimental parts with a magnet, a board board that can be used as a marker,
The fixing member and the test apparatus is attached to the magnet to be detachable to the test plate,
The force measuring device is a mechanical test device using a push pull gauge, which is fixed to one side of the test plate, the push pull gauge for digitally measuring the force by the mass member or the test apparatus.
The method of claim 1,
The push pull gauge is configured to include a main body having a display window on the front, a fixing means for fixing with the test plate on the back of the main body and accessories for the measuring head,
One side of the main body is further provided with a measuring shaft, the measuring head accessories are connected to the measuring shaft,
The fastening means is a dynamic test using a push pull gauge consisting of a hook formed with a groove which is opened downward to be fixed to the test plate, and a screw tightening to protrude into the groove by screwing to the rear bottom of the hook Device.
The method of claim 2,
The measuring head accessory comprises at least one of a hook-type connector, a balanced connector, a conical connector, a V-shaped connector, an A-type connector, and an extension rod.
The method according to any one of claims 1 to 3,
The fixing member is a dynamic test device using a push-pull gauge, characterized in that the position change fixing member for changing the direction of the force applied to the mass member or the position recognition fixing member for recognizing the position of the test apparatus.
The method of claim 4, wherein
The test apparatus is a mechanical test device using a push pull gauge, characterized in that the protractor and the attached slope or the graduated average balance.
The method of claim 5, wherein
The mass member is any one of a mass mass having a specific mass, a rotatable or rolling rotatable mass and a planar mass which is not rotatable in a plane.
The method according to claim 6,
Fixing the push pull gauge connected to the hook-type connector on the upper side of the test plate,
Attach the inclined surface to the center of the test plate,
Attaching a direction fixing member to the test plate between the push pull gauge and the inclined surface,
The rotating mass or the mass weight connected to the hook-type connector and the string passing through the direction changing member is placed on the inclined surface,
By varying the angle of the inclined surface by measuring the force appearing on the display window of the push pull gauge, the dynamic testing device using a push pull gauge, characterized in that for testing the force acting in the direction of the inclined surface.
The method according to claim 6,
Fixing the push pull gauge connected to the conical connector or the A-type connector through the expansion rod on the upper side of the test plate,
Attaching the position recognition fixing member to the test plate at a position spaced from the conical connector or the A connector,
The lower end of the middle portion is in contact with the position-recognition fixing member, the upper end of the one side contact the conical connector or the A-type connector, and the other side is installed the average stand so that the horizontal weight is suspended by hanging the mass weight with a string,
By measuring the force appearing on the display window of the push pull gauge while changing the position of the position-aware fixing member or the mass weight while the balance of the balance is maintained, by measuring the force acting in the vertical direction of the balance Dynamic testing device using a push pull gauge, characterized in that the torque experiment.
KR1020100042804A 2010-05-07 2010-05-07 Dynamics experiment equipment using pushpull gauge KR20110123365A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104900115A (en) * 2015-05-12 2015-09-09 浙江大学宁波理工学院 Portable comprehensive mechanical demonstrator
CN105469673A (en) * 2013-12-02 2016-04-06 杭州大华仪器制造有限公司 Two-dimensional maglev dynamics experiment instrument with reasonable structure
KR20170043156A (en) * 2015-10-13 2017-04-21 단국대학교 천안캠퍼스 산학협력단 Apparatus for Measuring Torque
CN106847004A (en) * 2015-03-13 2017-06-13 郭淑华 One kind teaching tension test platform
CN114792485A (en) * 2022-05-12 2022-07-26 四川省金堂中学校 Portable case of mechanics experiment instrument

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105469673A (en) * 2013-12-02 2016-04-06 杭州大华仪器制造有限公司 Two-dimensional maglev dynamics experiment instrument with reasonable structure
CN106847004A (en) * 2015-03-13 2017-06-13 郭淑华 One kind teaching tension test platform
CN104900115A (en) * 2015-05-12 2015-09-09 浙江大学宁波理工学院 Portable comprehensive mechanical demonstrator
CN104900115B (en) * 2015-05-12 2017-07-07 浙江大学宁波理工学院 Portable comprehensive mechanics demonstrator
KR20170043156A (en) * 2015-10-13 2017-04-21 단국대학교 천안캠퍼스 산학협력단 Apparatus for Measuring Torque
CN114792485A (en) * 2022-05-12 2022-07-26 四川省金堂中学校 Portable case of mechanics experiment instrument
CN114792485B (en) * 2022-05-12 2024-04-26 四川省金堂中学校 Portable box for mechanical experiment tool

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