JP2005106700A - Inner diameter measuring method and inner diameter measuring apparatus for high temperature cylindrical body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring device capable of measuring an inner diameter of a high-temperature cylindrical body without providing a special heat resistant structure.
An inner diameter measuring device 10 rotates a non-contact distance meter 65 that measures a distance based on a time from when a laser or a light beam is emitted until a reflected wave arrives, and the non-contact distance meter 65 rotates. Rotating means 30, axial moving means 50 for moving the non-contact distance meter 65 along the central axis of the high-temperature cylinder, and apparatus support for supporting the rotating means 30 and the axial moving means 50 collectively. 20.
[Effect] The inner diameter measuring device is composed of a non-contact distance meter, a rotating means, an axial movement means and an apparatus support. The apparatus is simple and the apparatus can be easily reduced in size and cost.
[Selection] Figure 1

Description

  The present invention relates to a technique for measuring the inner diameter of a high-temperature cylinder such as an engine cylinder.

  In cylindrical bodies such as engine cylinders, the accuracy of the inner diameter of the cylindrical body is important, and various dimension measuring apparatuses have been proposed regardless of contact type or non-contact type. By the way, since a cylinder of an engine is used at a high temperature, it is desired to measure dimensions at a high temperature.

Conventionally, as a technique for measuring a sample in a high temperature state, a non-contact displacement or strain gauge has been proposed (for example, see Patent Document 1).
Japanese Unexamined Patent Publication No. 7-151515 (FIG. 1)

  As shown in FIG. 1 of the same document, the technique of Patent Document 1 is such that the sample W is covered with a cylindrical body 4 formed of a light-transmitting member, and the outer shape of the sample W is measured by the non-contact displacement meter 1. Is to measure. By covering the cylindrical body 4, the heat rays from the sample W toward the displacement meter 1 can be blocked, and the displacement meter 1 and the like can be protected.

However, since the cylindrical body 4 is covered, the outer diameter of the cylindrical body can be measured with the technique of Patent Document 1, but the inner diameter of the cylindrical body cannot be measured.
Although a measurement technique in place of Patent Document 1 is required, when a heat-resistant structure is added to the measuring device, if a water-cooled or air-cooled structure is adopted as part of the heat-resistant structure, the measuring device becomes large and expensive.

  This invention makes it a subject to provide the measurement technique which can measure the internal diameter of a high temperature cylindrical body, without providing a special heat-resistant structure.

The invention according to claim 1 is an inner diameter measuring method for measuring a distance to an inner peripheral surface by inserting a non-contact type distance meter into a high temperature cylindrical body having a temperature exceeding an allowable use temperature of the non-contact type distance meter.
A step of examining a limit time until the room-temperature non-contact distance meter reaches the allowable use temperature by heat transfer from the high-temperature cylinder, a step of inserting the non-contact distance meter into the high-temperature cylinder, The step of counting the accumulated time, the step of measuring the distance to the inner peripheral surface while rotating the non-contact type distance meter at high speed, and the non-contact type distance meter at a high temperature before the accumulated time reaches the limit time. A method for measuring the inner diameter of a high-temperature cylindrical body comprising the step of taking out from the cylindrical body.

  The invention according to claim 2 is characterized in that, in the step of measuring the distance, a spiral measurement locus is drawn by moving along the central axis of the high-temperature cylinder while rotating the non-contact distance meter. The method for measuring the inner diameter of a high temperature cylindrical body according to claim 1.

The invention according to claim 3 is an inner diameter measuring apparatus for measuring a distance to an inner peripheral surface by inserting a non-contact type distance meter into a high temperature cylindrical body having a temperature exceeding an allowable use temperature of the non-contact type distance meter.
The inner diameter measuring device includes a non-contact type distance meter that measures a distance based on a time from when a laser or a light beam is emitted and a reflected wave arrives, a rotating unit that rotates the non-contact type distance meter, and the non-contact type distance meter. A high-temperature cylinder comprising: an axial movement means for moving a contact-type distance meter along the central axis of the high-temperature cylinder; and an apparatus support that collectively supports the rotation means and the axial movement means. Inner diameter measuring device.

  The invention according to claim 1 includes a step of taking out the non-contact type distance meter from the high-temperature cylindrical body before the accumulated time reaches the limit time, so that a heat-resistant structure is not required for the non-contact type distance meter. As a result, the inner diameter of the high-temperature cylindrical body can be measured with a small and inexpensive non-contact distance meter.

  In the invention according to claim 2, the non-contact distance meter is rotated. Although the cylindrical body is hot, air having a lower temperature exists in the internal space of the cylindrical body. By rotating in this air, the non-contact distance meter can be uniformly cooled with the surrounding air, and the temperature rise of the non-contact distance meter can be suppressed.

  In the invention according to claim 3, the inner diameter measuring device is constituted by a non-contact distance meter, a rotating means, an axial direction moving means, and a device support. The apparatus is simple and the apparatus can be easily reduced in size and cost.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a front view of a high-temperature cylindrical inner diameter measuring apparatus according to the present invention. In order to facilitate understanding of the apparatus configuration, FIGS.

  FIG. 2 is a configuration diagram of the apparatus support according to the present invention, and the apparatus support 20 has a plurality of (for example, three) lower leg portions 21 (... 3) placed on the upper edge of the high temperature cylindrical body W. Are the same), upper leg portions 23... Connected to upper portions of these lower leg portions 21... Via vertical pins 22. A lower base plate 24 supported by the upper base plate 26 and an upper base plate 26 mounted on the lower base plate 24 via column members 25.

  The upper leg portions 23 are fixed to the lower base plate 24, but the lower leg members 21 can be pivoted around the vertical pins 22 with respect to the upper leg members 23. Therefore, the position of the lower leg members 21 can be changed. As a result, the apparatus support 20 can be placed on the high-temperature cylindrical body W of various sizes.

  FIG. 3 is a block diagram of the rotation means according to the present invention. The rotation means 30 includes a rotation motor 31 attached to the upper base plate 26, a drive pulley 32 that is rotated by the rotation motor 31, and the drive pulley 32. A wound belt 33, a driven pulley 34 that is rotated by the belt 33, a support shaft 35 that is rotated by the driven pulley 34 and is rotatably attached to the lower base plate 24, and an upper rotation that is fixed to the lower end of the support shaft 35 A plate 36, a long rail 37 suspended from the position d from the center of rotation of the upper rotary plate 36, a lower rotary plate 38 fixed to the lower end of the rail 37, and a lower rotary plate 38 connected to each other via a bearing 39. Non-rotating plate 41 and a plurality of contacts (for example, three) 42... Projecting radially from the non-rotating plate 41.

  Although not described in detail, the contact 42 is springed by the action of a spring in the left-right direction of the drawing, and can correspond to the size change of the cylindrical body W. The non-rotating plate 41 is in a stationary state because the plurality of contacts 42 are in contact with the inner peripheral surface of the cylindrical body W. The lower rotating plate 38 rotates while being supported by such a non-rotating plate 41.

  When the support shaft 35 and the upper rotating plate 36 are rotated by the rotating action of the motor 31 for rotation, the rail 37 turns while drawing a circle with a radius d. The support of the lower rotation 38 and the non-rotating plate 41 prevents the rail 37 from swinging.

  FIG. 4 is a configuration diagram of the axial direction moving means according to the present invention. The axial direction moving means 50 includes a moving motor 51 attached to the upper base plate 26, a first pulley 52 rotated by the moving motor 51, A belt 53 wound around the first pulley 52, a second pulley 54 rotated by the belt 53, a support shaft 55 which is rotated by the second pulley 54 and rotatably attached to the lower base plate 24, and the support shaft A third pulley 56 attached to the lower portion of 55, a belt 57 wound around the third pulley 56, a fourth pulley 58 that is rotated by the belt 57, and a screw 59 that is rotated by the fourth pulley 58 and suspended. The slider 59 is moved up and down by the screw 59 and along the rail 37. A bearing member 63 is fixed to a bracket 62 extending from the upper rotating plate 36, and the upper end of the screw 59 is supported by the bearing member 63.

  Then, a non-contact distance meter 65 that measures the distance based on the time from when the laser or light beam is emitted until the reflected wave arrives is fixed to the slider 61.

  When the screw 59 is rotated by the rotational action of the moving motor 51, the slider 61 is raised or lowered along the rail 37.

  Returning to FIG. 1, the inner diameter measuring apparatus 10 measures a distance based on the time from when a laser or a light beam is emitted until a reflected wave arrives, and the non-contact distance meter 65 rotates. Rotating means 30 for rotating, axial moving means 50 for moving the non-contact distance meter 65 along the central axis of the high-temperature cylindrical body, and an apparatus for collectively supporting the rotating means 30 and the axial moving means 50 And a support 20.

  Reference numeral 70 denotes a braking means, and the structure is not described in detail, but is a kind of resistance means, and means for quickly stopping a rotating object such as the rail 37 when the rotating motor 31 and the moving motor 51 are stopped. It is.

  In addition, the rotation motor 31 and the movement motor 51 are controlled to rotate / stop and receive a distance signal from the non-contact distance meter 65, and the controller 80 monitors the time spent for the measurement. It is desirable to provide the measurement time monitoring means 81 to perform. The measurement time monitoring means 81 is preferably a timer, and confirms that the measurement is completed before the temperature of the non-contact distance meter reaches the allowable use temperature in FIG. 7 described later.

The operation of the high-temperature cylindrical inner diameter measuring apparatus having the above configuration will be described below.
FIG. 5 is an explanatory diagram of the operation of the high-temperature cylindrical inner diameter measuring apparatus according to the present invention.
In (a), the rail 37, the lower rotating plate 38, and the non-rotating plate 41 are inserted into the high temperature cylindrical body W, the contact 42 is brought into contact with the inner peripheral surface, and the lower leg portion 21. Set to the top of.

At (b), the screw 59 is turned to move the non-contact distance meter 65 to the lowest position.
At (c), the rail 37 is turned and the screw 59 is turned. Thus, the non-contact distance meter 65 is raised while rotating. The distance to the inner peripheral surface of the high temperature cylindrical body W is measured by the non-contact type distance meter 65 at the time of the rotation and rise.

  FIG. 6 is an image diagram showing a measurement trajectory according to the present invention, and a spiral measurement trajectory can be drawn by raising the non-contact distance meter 65 while rotating it. Accordingly, the distance measurement is completed when the ascent is completed.

Next, the meaning of rotation of the non-contact type distance meter 65 and the step of examining the limit time until the non-contact type distance meter at room temperature reaches the allowable use temperature by heat transfer from the high temperature cylindrical body will be described. .
FIG. 7 is a graph showing the temperature rise of the non-contact distance meter during measurement, with the horizontal axis representing time and the vertical axis representing temperature.
At the start of insertion of the horizontal axis, the temperature of the non-contact distance meter matches room temperature (around 25 ° C.). When the insertion is completed through the process of FIGS. 5 (a) → (b), the non-contact distance meter receives the heat of the high temperature cylindrical body and the temperature rises. When the distance is measured while rotating the non-contact distance meter at high speed (see FIG. 5C), the temperature of the non-contact distance meter rises due to the heat of the high-temperature cylinder.

The comparative example indicated by the imaginary line shows an example in which the non-contact distance meter is moved at a low speed, and exceeds the allowable use temperature (the upper limit temperature of use of the non-contact distance meter) before the measurement is completed.
On the other hand, in the Example shown with the continuous line, it shows that the temperature of a non-contact distance meter has not reached permissible use temperature at the time of completion of measurement.

  Although the cylindrical body is hot, air having a lower temperature exists in the internal space of the cylindrical body. By rotating in this air, the non-contact distance meter can be uniformly cooled by the surrounding air, and it is considered that the temperature increase of the non-contact distance meter can be suppressed.

  In implementing the present invention, it is important to examine the relationship between the temperature rise and time of the non-contact distance meter in advance. In the non-contact type distance meter, generally, since an electronic component incorporated therein is most susceptible to heat, an allowable use temperature is defined.

  Therefore, a non-contact type distance meter to be used is put in a high temperature atmosphere, time and temperature rise are measured, and a graph similar to FIG. 7 is drawn. Then, a measurable time is determined in consideration of an allowable use temperature. If this measurable time is determined, it can be used any number of times without damaging the non-contact distance meter by lifting the non-contact distance meter from the high temperature cylinder before this time elapses. I can say that.

  Accordingly, one aspect of the present invention is the step of examining the limit time until the non-contact distance meter at room temperature reaches the allowable use temperature by heat transfer from the high-temperature cylinder, and the non-contact distance meter is replaced with the high-temperature cylinder. The step of inserting, the step of counting the accumulated time from the insertion, the step of measuring the distance to the inner peripheral surface while rotating the non-contact distance meter at high speed, and the accumulated time reaches the limit time. A method for measuring the inner diameter of a high-temperature cylinder, comprising the step of previously removing a non-contact distance meter from the high-temperature cylinder.

  Since the process includes a step of removing the non-contact distance meter from the high-temperature cylinder before the accumulated time reaches the limit time, a heat-resistant structure is not required for the non-contact distance meter. As a result, the inner diameter of the high-temperature cylindrical body can be measured with a small and inexpensive non-contact distance meter.

  In addition, the distance measuring technique of the present invention is not limited to the type and application of the cylindrical body as long as it is similar to measuring the inner diameter of a cylinder of an engine, as well as measuring the inner diameter of a similar high-temperature cylindrical body.

  The present invention is suitable for a technique for measuring the inner diameter of an engine cylinder in a high temperature state.

It is a front view of the internal diameter measuring apparatus of the high temperature cylindrical body which concerns on this invention. It is a block diagram of the apparatus support body which concerns on this invention. It is a block diagram of the rotation means which concerns on this invention. It is a block diagram of the axial direction moving means which concerns on this invention. It is operation | movement explanatory drawing of the internal diameter measuring apparatus of the high temperature cylindrical body which concerns on this invention. It is an image figure which shows the measurement locus | trajectory based on this invention. It is a graph which shows the temperature rise of the non-contact type distance meter during measurement.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Inner diameter measuring apparatus of high temperature cylindrical body, 20 ... Apparatus support body, 30 ... Rotating means, 50 ... Axial direction moving means, 65 ... Non-contact distance meter, W ... High temperature cylindrical body.

Claims (3)

In the inner diameter measurement method of measuring the distance to the inner peripheral surface by inserting a non-contact distance meter into a high-temperature cylinder that exceeds the allowable operating temperature of the non-contact distance meter,
A step of examining a limit time until the room-temperature non-contact distance meter reaches the allowable use temperature by heat transfer from the high-temperature cylinder, a step of inserting the non-contact distance meter into the high-temperature cylinder, The step of counting the accumulated time, the step of measuring the distance to the inner peripheral surface while rotating the non-contact type distance meter at high speed, and the non-contact type distance meter at a high temperature before the accumulated time reaches the limit time. A method for measuring the inner diameter of a high-temperature cylindrical body comprising the step of taking out from the cylindrical body.   2. The high temperature according to claim 1, wherein in the step of measuring the distance, a spiral measurement trajectory is drawn by moving along the central axis of the high temperature cylindrical body while rotating the non-contact type distance meter. Measuring method of inner diameter of cylindrical body. In an inner diameter measuring device that measures the distance to the inner peripheral surface by inserting a non-contact distance meter into a high-temperature cylinder that exceeds the allowable operating temperature of the non-contact distance meter,
The inner diameter measuring device includes a non-contact type distance meter that measures a distance based on a time from when a laser or a light beam is emitted and a reflected wave arrives, a rotating unit that rotates the non-contact type distance meter, and the non-contact type distance meter. A high-temperature cylinder comprising: an axial movement means for moving a contact-type distance meter along the central axis of the high-temperature cylinder; and an apparatus support that collectively supports the rotation means and the axial movement means. Inner diameter measuring device.

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