KR101214185B1

KR101214185B1 - Measuring Apparatus For Measuring Outer Diameter Of Object Using Displacement Sensor

Info

Publication number: KR101214185B1
Application number: KR1020100126702A
Authority: KR
Inventors: 황정호; 홍원표; 이동윤; 이낙규
Original assignee: 한국생산기술연구원
Priority date: 2010-12-13
Filing date: 2010-12-13
Publication date: 2012-12-21
Also published as: KR20120065525A

Abstract

The present invention relates to an apparatus for measuring the outer diameter of a product, and more particularly, to an outer diameter measuring device using a displacement sensor capable of continuously and accurately measuring the outer diameter of a product. The present invention relates to an apparatus for measuring the outer diameter of a product, and more particularly, to an outer diameter measuring device using a displacement sensor capable of continuously and accurately measuring the outer diameter of a product. To this end, the present invention is a fixed frame 110 is provided with a work stage 111 on which the measured object (A) is placed, and is installed to be elevated on the fixed frame (110) to the upper portion of the measured object (A) It has a stator 120 and a contact end consisting of a horizontal plane, the elastic contactor 141 independently reciprocating to be in contact with the extreme end of the object to be measured (A) and the elastic contactor (141) Displacement sensor that is fitted and fixed to each sensor fixing block 130 so that the external displacement of the measured object A can be measured by summing the respective displacement amounts generated until the contact with the extreme end of the measured object A is performed. 140 and the displacement sensor is fitted and fixed, the sensor fixing block 130 and the elastic to be disposed facing each other on both sides of the work stage 111 to provide a reference position for measuring the displacement amount of the displacement sensor To give the contact 141 a reciprocating force. It is configured to include a driving unit 150 connected to the rear end of the displacement sensor 140.

Description

Measuring Apparatus For Measuring Outer Diameter Of Object Using Displacement Sensor

The present invention relates to an apparatus for measuring the outer diameter of a product, and more particularly, to an outer diameter measuring device using a displacement sensor capable of continuously and accurately measuring the outer diameter of a product.

In general, the industrial site is to go through the inspection process to determine the defect by measuring the dimensions of the manufactured product. This inspection process is a process that must go through for quality control and quality improvement. If the manufactured product is an accessory such as cap sealing that is mounted on a product such as a car that requires precision and safety, Thorough dimension control is done.

The cap sealing is recognized as the main item of the dimension control of the outer diameter of the product due to the characteristics of the product, the measurement of such an outer diameter using a measuring instrument such as a vernier caliper or micrometer, or using a specially made measuring jig or pass inspection port Most of the time, the worker inspected the dimensions of the product. Therefore, the measurement error is easy to occur according to the skill of the operator and the measurement time is too long, there was a problem that the productivity is greatly reduced.

In particular, the above-described methods are very difficult to apply in the assembly line that the parts must be continuously supplied because the inspection speed is very slow, it must be made collectively before the release of the product. Therefore, even if the inspection process is judged to be good, the reliability of the product is greatly deteriorated since it may be supplied as a defective product to the assembly line where the actual measured object is mounted after the product is released and its dimensions are changed during transportation and storage. Is generated.

The present invention has been made to solve the above problems, to provide an outer diameter measuring device using a displacement sensor that can be installed and operated on an assembly line on which the actual measured object is mounted by rapidly and accurately measuring the outer diameter of the product. The purpose is.

In order to achieve the above object, the outer diameter measuring apparatus using the displacement sensor of the present invention is a fixed frame having a work stage on which the object to be measured, and is installed to be elevated on the fixed frame to support the upper part of the object under test And a stator and an elastic contactor independently reciprocating to contact the outermost end of the object under test, having a contact end formed in a horizontal plane. A displacement sensor for measuring the outer diameter of the object to be measured by adding the displacement sensor, the displacement sensor is fitted and fixed, and disposed to face each other on both sides of the working stage to provide a reference position for measuring a displacement amount of the displacement sensor; A drive connected to a rear end of the displacement sensor to impart a reciprocating movement force to the elastic contactor of the displacement sensor It characterized by configured by comprising a stage.

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In addition, the displacement sensor is fitted with a bush is coupled, the fastening screw for pressing the side of the bush can be fastened to the sensor fixing block.

On the other hand, the drive means may be a hydraulic cylinder or pneumatic cylinder.

In addition, the sensor fixing block is preferably installed to be accessible to both sides of the work stage.

According to the outer diameter measuring device using the displacement sensor of the present invention configured as described above, the external diameter of the measuring object is measured by summing the displacements of the elastic contactors of the displacement sensors approaching from both ends of the measuring object, so that the position of the measuring object is measured accurately. Even if it is not placed in position, it has the effect of quick and precise external diameter measurement regardless.

In addition, in the present invention, since the contact end of the elastic contact is made of a horizontal plane, even if the shape of the side end of the object to be measured is curved or irregular irregular portions, the contact end may always be in contact with the outermost end. Even if it is not placed in the correct measuring position, the outermost end of the measured object can always be contacted within a certain allowable range, so that the accurate outer diameter of the continuously measured object can be measured.

As a result, the present invention enables fast and accurate measurement of all the measured objects continuously installed on the assembly line on which the measured object is to be mounted, so that only the product determined as good quality is provided to the work site in real time. The effect of greatly improving the reliability can be expected.

1 is a perspective view of an outer diameter measuring device using a displacement sensor of the present invention;
Figure 2 is a front view of the outer diameter measuring device using a displacement sensor of the present invention;
3 is a cross-sectional view of the displacement sensor constituting the present invention;
4 is a plan view showing an arrangement of displacement sensors constituting the present invention;
5 is a front view of the outer diameter measuring device using the displacement sensor of the present invention showing a state in which the elastic contactor of the displacement sensor is advanced from the sensor fixing block;
6 is a front view of an outer diameter measuring device using a displacement sensor according to the present invention, in which the elastic contactor of the elastic contactor is in contact with both ends of the object to be measured; And
7 is a front view of the outer diameter measuring device using the displacement sensor of the present invention, a state in which the elastic contactor is compressed.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims are to be interpreted in accordance with the technical idea of the present invention based on the principle that the inventor can properly define the concept of the term in order to explain his invention in the best way. It must be interpreted in terms of meaning and concept.

As shown in Figure 1 and 2, the outer diameter measuring device using the displacement sensor 140 of the present invention is a fixed frame 110 is provided with a work stage 111 on which the measured object (A) is placed, and A stator 120 installed on the fixed frame 110 so as to be elevated, and supporting the upper portion of the object A under test, and a sensor fixing block 130 disposed to face each other on both sides of the work stage 111; And an elastic contactor 141 independently reciprocating so as to contact the outermost end of the object under test (A), each of which is generated until the elastic contact 141 contacts the outermost end of the object under test (A). The displacement sensor 140 is inserted into and fixed to each sensor fixing block 130 so as to measure the outer diameter of the measured object A by summing the displacement amounts of the moving object and the elastic contact 141 of the displacement sensor 140. It comprises a drive means 150 connected to the rear end of the displacement sensor 140 to give a reciprocating movement force The.

The work stage 111 is positioned at the center of the fixed frame 110. Grooves 111a are formed on both sides of the bottom of the work stage 111 to avoid interference with the displacement sensor 140. Although not shown, the front of the work stage 111 is connected to the transfer device for continuously supplying the measured object (A) to the work stage 111 side, the one side of the work stage 111 is supplied through the transfer device A stopper is provided to restrict the measured object A from leaving the measurement position.

The guide rail 121 is vertically installed on the front surface of the fixing frame 110. The stator 120 is fitted to the guide rail 121 and is coupled to the stator 120. The stator 120 is vertically moved by the guide rail 121. The stator 120 is given a lift force from the driving means 122 installed on the top of the fixed frame 110. The stator 120, which has been raised by the lifting force from the driving means 122, descends until it comes into contact with the upper end of the object A placed on the work stage 111 through free fall. As the driving means 122, a pneumatic cylinder or a hydraulic cylinder is suitable.

On the other hand, the stator 120 is provided with a damper to prevent contact impact with the object to be measured (A) generated when descending. To this end, at least one of one side or both sides of the stator 120 is provided with a support block 123 for installing the damper.

The damper includes a guide rod 124 penetrating through the support block 123 installed in the stator 120, and a top end of the support block 123 when the stator 120 descends by being inserted into the lower end of the guide rod 124. Compression by the lower end is composed of a compression spring (125) for providing a force in the direction in which the stator 120 rises.

On the other hand, the damper is installed vertically on the upper end of the stator 120, the guide rod 126 passing through the upper end (110a) of the fixing frame 110, the upper end of the guide rod 126 and the fixing frame 110 Both ends may be supported at the upper end 110a of the compression spring 127 to provide a resilient force in a direction in which the stator 120 rises. In this case, the stator 120 is provided with a more stable and uniform damping force that is not eccentric.

Of course, the damper may be installed on both sides and the upper end of the stator 120.

Sensor fixing blocks 130 are disposed on both sides of the work stage 111 to face each other. The sensor fixing block 130 is located at the same distance with respect to the center of the work stage 111. Since the sensor fixing block 130 provides a reference position for measuring the displacement amount of the displacement sensor 140, it is preferable that the sensor fixing block 130 is firmly fastened on the work stage 111 or the fixing frame 110 so that the installation position does not flow. Do.

As shown in Figure 3 and 4, each sensor fixing block 130 is formed with a horizontal through-hole 131 corresponding to the height of the side end of the measured object (A) located in front, each horizontal through Displacement sensor 140 is fitted into the ball 131 is coupled.

As a displacement sensor 140 constituting the present invention, a linear Variab1e differentia1 transformer (LVDT) is employed. The LVDT is a displacement measuring sensor that displays a change in inductance generated by linear contact with the object to be measured as an electrical signal. The LVDT can measure precisely to a displacement of 1 mm or less, so that it is a direct measuring means for precision machine parts. Is very suitable.

On the other hand, the front end of the displacement sensor 140 is provided with an elastic contact 141 in contact with the extreme end of the object to be measured (A). When the elastic contact 141 is drawn out of the main body of the displacement sensor 140 and moves forward, the elastic contact 141 comes into contact with the object A and is compressed by its elasticity. Thus, the contact shock transmitted to the displacement sensor 140 is eliminated. When the elastic contactor 141 moves backward, the compressed elastic contactor 141 is extended as it is.

The contact end 141a of the elastic contact 141 has a horizontal plane. This is to ensure that the contact end 141a can always be in contact with the outermost end even if the shape of the side end of the measurement object A is curved or irregularly formed.

In addition, the contact end 141a is formed in a horizontal plane so that the contact end 141a can accurately contact the outermost end of the measured object A even when the measured object A is not placed in the correct measuring position. To do this. That is, since the work stage 111 is not provided with a device for guiding the measured object A supplied by the transfer device in the correct position, the work stage 111 is placed on the work stage 111. The position can only be fluid, and if the flow range is within the range of the horizontal plane of the contact end 141a, the contact end 141a can always be in contact with the outermost end of the object A to be measured. Therefore, the horizontal plane should be considered in the design stage so as to be formed larger than the flow range of the measurement object (A).

In addition, although the shape of the contact end 141a may be formed in an arc shape corresponding to the side shape of the measurement target A, in this case, the reciprocating distance of the elastic contact 141 becomes excessively large, thereby making a quick measurement. It is hard to lose. Therefore, when the contact end 141a of the elastic contactor 141 is formed in a horizontal plane, the reciprocating distance of the displacement sensor 140 can be minimized, so that rapid measurement is possible.

On the other hand, the elastic contact 141 of the displacement sensor 140 is independently fixed in the horizontal through-hole 131 of the sensor fixing block 130 through the driving means 150 connected to the rear end of the main body of the displacement sensor 140. It is given the movement force to move the section back and forth. The driving means 150 is preferably a hydraulic cylinder or a pneumatic cylinder.

For example, when all the internal air of the body of the displacement sensor 140 is discharged to the outside through the pneumatic cylinder connected to the rear end of the body of the displacement sensor 140, the elastic contact 141 is moved to the rear, the object to be measured (A) When the compressed air is introduced into the main body of the displacement sensor 140 through the pneumatic cylinder, the elastic contact 141 is moved forward while being discharged from the main body of the displacement sensor 140.

In addition, the sensor fixing block 130 is fastened to a fastening screw 132 that fixes the main body of the displacement sensor 140 without flowing in the horizontal through hole 131 by pressing the side of the displacement sensor 140. In this case, since the position of the displacement sensor 140 becomes a very important management item in the external diameter measurement of the measured object A, the displacement by the operating force of the driving means 150 is caused when the tightening force of the tightening screw 132 falls. The bush 133 is preferably fitted to the main body of the displacement sensor 140 so that an accident in which the position of the sensor 140 is changed back and forth does not occur. Tightening screw 132 presses the side of the bush (133). Therefore, even if the tightening force of the tightening screw 132 falls, the main body of the displacement sensor 140 does not easily flow from side to side due to the friction force of the bush 133.

On the other hand, the sensor fixing block 130 to both sides of the work stage 111 Accessible It can also be installed to. This is the displacement of the sensor 140 Of elastic contactor 141 Since the moving range is as small as 4mm, it is possible to Of the subjects (A) Outer diameter Without difficulty This is to allow measurement. To this end, the sensor fixing block ( 130) Reciprocating movement of the sensor fixing block 130 to both sides of the work stage 111 in the lower portion The transfer block 160 It is installed. remind The transfer block 160 The upper body 161 and the lower body 162 is divided into the upper body 161 and the lower body 162 between the upper body 161 To work stage 111 Sliding movement The transfer member 163 Is installed. remind As the conveying member 163 Quiet Driving Division Precise control cross Roller guides are suitable. Although not shown, the above Of the transport block 160 On one side Upper block with transfer completed 161) Not floating The stopper may be further installed to fix the same.

The outer diameter measuring device using the displacement sensor 140 of the present invention configured as described above measures the outer diameter of the object to be measured A as follows.

first, Of the measured object (A) Of the outer diameter and displacement sensor 140 Of elastic contactor 141 Displacement sensor 140 in the sensor fixing block 130 in consideration of the moving range together Fix .

Transfer block 160, the displacement sensor 140, the sensor fixing block by operating the transfer member (163) with the following transfer block 160 having a fixed first to 130 work the sensor fixing block 130, the stage is installed going to reciprocate in opposite sides of 11 to set the proper position.

When the position of the sensor fixing block is set, when the measured object A is supplied to the work stage 111, the stator 120 located above the work stage 111 descends and presses the upper portion of the measured object A while lowering. To prevent flow. And as the driving means 150 is operated as shown in Figure 5, the displacement sensor (located inside the horizontal through hole 131 of each sensor fixing block 130 disposed on both sides of the work stage 111 ( An elastic contact 141 of 140 is advanced toward both ends of the object A to be measured.

As shown in FIG. 6, the elastic contactor 141 is advanced by the driving means 150 until it is in contact with the extreme end of the sensor fixing block 130 located in front, and the displacement sensors 140 are The amount of displacement generated until the elastic contact 141 contacts the outermost end of the object A is measured.

If the outer diameter of the measured object A is larger than the normal value, or if the position of the measured object A is biased to one side, the normal contact distance of the elastic contact 141 corresponding thereto is shortened. Even when the measured object A and the elastic contactor 141 are in contact with each other, the elastic contactor 141 is drawn out of the main body of the displacement sensor 140 to move forward. In this case, as shown in FIG. As the 141 is compressed, the shock transmitted to the main body of the measured object A or the displacement sensor 140 is absorbed.

The operator can accurately measure the outer diameter of the measured object A by summing the displacement amounts measured by the elastic contactor 141 of each displacement sensor 140, and thereby determine the amount / defect of the measured object A. You can judge.

On the other hand, computer program the computer to determine whether the sum of the movement displacement of the elastic contactor 141 measured from the displacement sensors 140 is within the preset tolerance range, and the result Therefore, an automated system can be constructed to be selectively transported to subsequent processes.

The present invention measures the outer diameter of the measured object A by summing the displacement amounts of the elastic contactors 141 approaching from both ends of the measured object A, so that the position of the measured object A is in the correct measuring position. Even if it is not placed, the outer diameter can be measured quickly and precisely regardless.

As described above, preferred embodiments of the present invention are described above with reference to the drawings, but the present invention is not limited to the above-described embodiments, and those skilled in the art may modify the present invention without departing from the spirit of the present invention. Possible, such modifications will fall within the scope of the invention.

110 Fixed frame 111 Working stage
120 Stator 130 Sensor fixing block
132 Tightening screw 133 Bush
140 ... displacement sensor 141 ... elastic contactor
141a ... Contact 150 ... Drive
160 ... Transfer Block A ... Measured object

Claims

A fixed frame having a work stage on which an object to be measured is placed;
A stator installed on the fixed frame so as to be elevated, and supporting the upper portion of the object under test;
It has an elastic contact that independently reciprocates so as to be in contact with the outermost end of the object under test, having a contact end formed in a horizontal plane, and summing the respective displacement amounts generated until the elastic contactor is in contact with the outermost end of the object under test. A displacement sensor for measuring an outer diameter of the object to be measured;
A sensor fixing block to which the displacement sensor is inserted and fixed, and disposed to face each other on a working stage to provide a reference position for measuring a displacement amount of the elastic contactor; And
An outer diameter measuring device using a displacement sensor, characterized in that it comprises a drive means connected to the rear end of the displacement sensor to impart a reciprocating movement force to the elastic contact.

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The method of claim 1,
A bush is fitted to the displacement sensor,
The outer diameter measuring device using a displacement sensor, characterized in that the fastening screw for pressing the side of the bush is fastened to the sensor fixing block.

The method of claim 1,
The drive means is an outer diameter measuring device using a displacement sensor, characterized in that the hydraulic cylinder or pneumatic cylinder.

The method of claim 1,
The sensor fixing block is an outer diameter measuring device using a displacement sensor, characterized in that installed to be accessible to both sides of the work stage.