Tool for measuring diameter of shaft or aperture through chord length

Abstract

The utility model provides a tool for measuring the diameter of a shaft or an aperture through chord length. The tool is characterized in that a vertical mounting hole is formed in the middle of a fixed clamping jaw; the two sides of the fixed clamping jaw are provided with two measuring clamping jaws extending downwards. The distances from the lower ends of the two measuring claws to the axis of the mounting hole are the same; the outer surface of the graduated scale passes through the mounting hole of the fixed clamping jaw in a transition fit manner, the outer surface of the graduated scale is provided with size scales, and when the bottom end of the measuring clamping jaw and the bottom end of the graduated scale are on the same straight line, the 0-point scale on the graduated scale is flush with the upper side surface of the fixed clamping jaw; when the size of the shaft diameter is measured, the bottom ends of the two measuring claws and the bottom end of the graduated scale are attached to the cylindrical surface of the shaft diameter; when the diameter size of the hole is measured, the bottom ends of the two measuring claws and the bottom end of the graduated scale are attached to the cylindrical surface of the hole diameter. The device is simple in structure, easy to operate, and low in error of shaft or hole diameter measurement.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tool field, and concretely is a tool for measuring the diameter of a string length, an axle or a hole. BACKGROUND

[0002] With the development of the wind power industry, the service life of the wind turbine gearbox or main shaft system is also getting longer and longer, and the failure rate is also getting higher and higher. Some severely damaged gearboxes or main shaft systems need to be replaced. Before the replacement, the replacement model needs to be confirmed. Due to incomplete early data or confidentiality measures between manufacturers, personnel need to go to the wind turbine factory to measure the external dimensions of the gearbox or main shaft system when confirming the replacement model. Due to the limited space in the cabin, it is often difficult to measure the diameter of the shaft or the hole when measuring the dimensions.

[0003] In the prior art, when measuring the diameter of the shaft, a long string is often used to wrap around the shaft diameter for one turn to measure the circumference of the shaft diameter and calculate the diameter.

[0004] When measuring the hole size, since the long string cannot be used to wrap around the hole for one turn to measure the circumference of the hole, the size of the shaft diameter below the hole is measured, the distance from the shaft to the hole is measured, and then the hole diameter size is calculated.

[0005] Disadvantages of the prior art:

[0006] 1) When measuring the diameter of the shaft, if there are other protrusions at the wrapping position, the measured bearing will be larger, the calculated shaft diameter will be larger, and the error cannot be eliminated.

[0007] 2) When measuring the diameter of the shaft, due to the structure of the gearbox or main shaft system or the limited space in the cabin, if the position to be measured is not exposed to a full circle or the space is too small to wrap the string, the shaft diameter cannot be measured and calculated.

[0008] 3) When measuring the hole diameter, the above two defects exist, and the hole diameter size needs to be calculated based on the distance between the hole and the shaft, which results in a larger error. Invention content

[0009] The utility model provides a tool for measuring the diameter of a string length, an axle or a hole, which aims to solve the shortcomings of the prior art and provide a tool with simple structure, easy operation and low error in measuring the diameter of an axle or a hole.

[0010] The utility model adopts the technical scheme of:

[0011] The tool for measuring the diameter of a string length, an axle or a hole is characterized by:

[0012] The middle position of the fixed clamping jaw is provided with a vertical mounting hole;

[0013] Two downward extending measuring claws are arranged on both sides of the fixed claw;

[0014] The distance from the lower end of the two measuring claws to the axis of the mounting hole is the same;

[0015] The outer surface of the scale passes through the mounting hole of the fixed claw in a transition fit, and a size scale is arranged on the outer surface of the scale, when the bottom end of the measuring claw and the bottom end of the scale are in a straight line, the 0 point scale on the scale is flush with the upper side of the fixed claw;

[0016] When measuring the diameter of the shaft, the bottom end of the two measuring claws and the bottom end of the scale are attached to the cylindrical surface of the shaft diameter;

[0017] When measuring the diameter of the hole, the bottom end of the two measuring claws and the bottom end of the scale are attached to the cylindrical surface of the hole diameter.

[0018] The fixed claw comprises a digital display unit; the vertical mounting hole is located at the middle position of the digital display unit; the digital display unit has a display unit, a calibration button and a switching button.

[0019] The upper side of the fixed claw is a plane.

[0020] The bottom end of the measuring claw is in the shape of an acute angle, and the bottom end of the scale is an acute angle.

[0021] The mounting hole is cylindrical, and the cylindrical surface on the outer surface of the scale passes through the mounting hole in a transition fit.

[0022] The side surface of the digital display unit is provided with a locking device. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further described in connection with the drawings and examples.

[0024] Figure 1 It is the tool schematic view of example 1;

[0025] Figure 2 It is the claw plan view of example 1;

[0026] Figure 3 It is the partial sectional view of the side of the claw of example 1;

[0027] Figure 4 It is the side view of scale of example 1;

[0028] Figure 5 It is the diameter of the shaft of example 1 schematic diagram;

[0029] Figure 6 It is the process schematic diagram of calculating the diameter of the shaft of example 1;

[0030] Figure 7This is a schematic diagram of the aperture measurement in Example 1;

[0031] Figure 8 This is a schematic diagram of the tooling used in Example 2;

[0032] Figure 9 This is a top view of the chuck claw in Example 2;

[0033] Figure 10 This is a partial sectional view of the side of the chuck in Example 2;

[0034] Figure 11 This is a side view of the scale in Example 2;

[0035] Figure 12 This is a schematic diagram of shaft diameter measurement in Example 2;

[0036] Figure 13 This is a schematic diagram of the shaft diameter calculation process in Example 2;

[0037] Figure 14 This is a schematic diagram of the aperture measurement in Example 2. Detailed Implementation

[0038] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort. To facilitate understanding of this utility model, a more detailed description of this utility model will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0039] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Example 1:

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown:

[0042] The upper side 103 of the fixed jaw 1 is a flat surface for reading the size during measurement, and a vertical mounting hole 101 is arranged at the middle position of the fixed jaw 1.

[0043] Two downward extending measurement jaws 102 are arranged at the two sides of the fixed jaw 1, the measurement jaw 102 has a certain width c, the bottom end of the measurement jaw 102 is in a sharp angle shape, and the distance from the lower end of the two measurement jaws 102 to the axis of the mounting hole 101 is the same, which is used to ensure that the axis of the mounting hole 101 passes through the center of the measured shaft or hole during measurement.

[0044] The cylindrical surface 201 on the scale 2 is transitionally fitted through the mounting hole 101 of the fixed jaw 1, which ensures that the scale 2 is firmly installed and can be smoothly moved, and the size scale is arranged on the cylindrical surface 201, and the bottom end 202 is in a sharp angle shape, which is used to ensure that the shaft or hole can be pressed during measurement. When the bottom end of the measurement jaw 102 and the bottom end 202 of the scale 2 are on a straight line after the tooling is combined, the 0 point scale on the scale 2 is exactly flush with the upper side 103 of the fixed jaw 1.

[0045] As shown: Figure 5

[0046] When it is necessary to measure the diameter size of a shaft, the tooling is placed at the position of the shaft diameter to be measured, and the bottom ends of the two measurement jaws 102 with a certain width on the two sides are attached to the cylindrical surface of the shaft diameter, the scale 2 is moved so that the bottom end 202 is in contact with the cylindrical surface of the shaft diameter, and at this time the scale value on the scale 2 flush with the plane 103 is the moving distance a of the scale 2.

[0047] As shown: Figure 6

[0048] According to the perpendicular diameter theorem of circle and related inferences, the circumference angle theorem and related inferences, and the related theorems of triangle, the triangle ABC is a right triangle, the triangle ABD is a right triangle, AD=a, BD=b, AC is the diameter of the measured shaft, and the two triangles are similar triangles.

[0049] Combined with the Pythagorean theorem, the following can be calculated:

[0050] AB*AB=a*a+b*b

[0051] AC / AB=AB / AD

[0052] AC=AB*AB / AD=((a*a+b*b) / a)

[0053] The diameter AC=(a 2 +b 2 ) / a

[0054] ​​As Figure 7 shown:

[0055] When the diameter of the hole needs to be measured, the diameter of the hole is measured and calculated according to the above method. The bottom end of the two measuring claws 102 and the bottom end of the scale 2 are attached to the cylindrical surface of the hole diameter.

[0056] If the scale line on the scale 2 is set to the corresponding diameter value according to the above formula, the measured diameter size can be directly read.

[0057] Advantages of the embodiment:

[0058] 1. Simple structure, easy to assemble and operate, can directly measure the corresponding size of the shaft or hole and calculate the diameter;

[0059] 2. When the shaft diameter or hole diameter needs to be measured, the protrusions and other positions of the shaft diameter part can be excluded, which can exclude the influence of the protrusions and other positions;

[0060] 3. For the reasons such as the structure of the gear box or the main shaft system or the space limitation of the cabin, the position of the shaft diameter to be measured is not exposed to the whole circle or the space is small, which cannot be measured and calculated. The diameter can be measured and calculated by using part of the exposed arc part.

[0061] The embodiment has simple structure, easy installation and operation. The measuring claw has a certain width, and the distance to the mounting hole is the same, which is used to ensure that the mounting hole passes through the center of the measured shaft or hole during measurement. The corresponding size of the shaft or hole can be directly measured and the diameter can be calculated. The initial position 0 scale of the tool is flush with the reading mark surface, which is convenient for reading the moving distance. Only one arc needs to be measured to obtain the diameter of the corresponding circle, and the structure and space have little effect. When the scale line on the scale is set to the corresponding diameter value according to the above formula, the measured diameter size can be directly read, which is convenient and fast.

[0062] Embodiment 2:

[0063] As Figure 8 , Figure 9 , Figure 10 , Figure 11 :

[0064] The fixed claw 1 and the scale 2 have a capacitive sensor function and can measure displacement.

[0065] The fixed jaw 1 is composed of two jaws 101 and a digital display unit 102. The middle position of the digital display unit 102 is provided with a vertical mounting hole 1021, the upper surface 1022 is a plane, the size can be read during measurement, the side surface is provided with a locking device 1023, the scale can be locked during measurement, the reading can be carried out after the tooling is removed, the digital display unit 102 has a display unit 104 for displaying the measured value, a calibration button 1025, and a switching button 1026. The program formula for calculating the diameter through displacement is pre-edited in the digital display unit 102, the calibration button 1025 is used for calibrating and zeroing the tooling before measurement, so as to ensure the accuracy of the measurement data, and the switching button 1026 can switch the internal program, so that the display unit 1024 displays the measured diameter or the measured displacement value.

[0066] The two sides of the fixed jaw 1 are provided with two downwardly extending jaws 102, the bottom of the jaw 101 is provided with a sharp corner shaped measuring jaw 1011, the measuring jaw 1011 has a certain width c, and the distance from the lower end of the two measuring jaws 1011 to the axis of the mounting hole 1021 is the same, so as to ensure that the mounting hole passes through the center of the measured shaft or hole during measurement.

[0067] The cylindrical surface 201 on the scale 2 is transitionally fitted through the mounting hole 1021 of the fixed jaw 1, so as to ensure that the scale 2 is firmly installed and can be smoothly moved, the cylindrical surface 201 is provided with a size scale, and the bottom end 202 is a sharp corner, so as to ensure that the shaft or hole can be pressed during measurement.

[0068] After the tooling is combined, the bottom end of the measuring jaw 1011 and the bottom end 202 of the scale 2 are placed on the same plane before measuring the diameter, that is, they are on a straight line, the 0 point scale on the scale 2 is flush with the upper surface 1022 of the fixed jaw 1, the display value is the diameter value by pressing the switching button 1026, and the display unit 1024 displays the value as zero by pressing the calibration button 1025 (such as Figure 8 ).

[0069] As shown in Figure 12 When the diameter of a shaft needs to be measured, the tooling is placed at the position of the shaft diameter to be measured, and the bottom ends of the two sides of the measuring jaw 1011 with a certain width are attached to the cylindrical surface of the shaft diameter. The scale 2 is moved, so that the bottom end 202 is in contact with the cylindrical surface of the shaft diameter, at this time, the scale value on the scale 2 flush with the plane 1022 is the moving distance a of the scale 2, and the corresponding electrical signal is converted through the function of the capacitive sensor.

[0070] As shown in Figure 13 :

[0071] According to the vertical diameter theorem of circle and related inferences, and the circumference angle theorem and related inferences, and the related theorems of triangle, the triangle ABC is a right triangle, the triangle ABD is a right triangle, AD=a, BD=b, AC is the diameter of the measured shaft, and the two triangles are similar triangles.

[0072] In combination with the Pythagorean theorem, the following can be calculated:

[0073] AB*AB=a*a+b*b

[0074] AC / AB=AB / AD

[0075] AC=AB*AB / AD=((a*a+b*b) / a)

[0076] The diameter AC=(a 2 +b 2 ) / a

[0077] The formula is edited in the digital display unit 102, and the value displayed by the display unit 1024 is the diameter size.

[0078] As Figure 14 :

[0079] When the diameter size of the hole needs to be measured, the diameter size of the hole is also measured according to the above method. The bottom ends of the two measuring claws 1011 and the bottom end of the scale 2 are attached to the cylindrical surface of the hole diameter.

[0080] Advantages of the embodiment:

[0081] 1. Simple structure, easy assembly and operation, and direct measurement of the diameter size of the shaft or hole;

[0082] 2. Direct display of the measured value, reduction of errors caused by visual line or interval precision, calibration before measurement, reduction of errors caused by tool wear, and more accurate data;

[0083] 3. The measurement can be locked and the reading can be removed, which is more convenient, and the function is more diverse according to the switching display value;

[0084] 4. When the shaft diameter or hole diameter needs to be measured, the position of the shaft diameter part has a protrusion, which causes the size of the whole circle to be large and cannot be excluded, and the influence of the protrusion position can be excluded;

[0085] 5. For the reasons of gear box or main shaft system structure or cabin space limitation, the position of the measured shaft diameter is not exposed to the whole circle or the space is small and cannot be measured, which causes the shaft diameter size to be measured and calculated. The diameter can be measured by using part of the exposed arc part.

[0086] The embodiment has simple structure, is convenient to install and operate, and has the measuring claw with certain width and the same distance to the installation hole, which is used for ensuring that the installation hole passes the center of the measured shaft or hole during measurement. The embodiment has the digital display unit, the calibration button and the switching button, and the diameter calculation formula is edited in advance, so that the calibration can be performed before measurement, the corresponding size of the shaft or hole is directly measured and the value of the corresponding diameter is directly displayed on the display unit, the error caused by reading and abrasion is reduced, and the data is more accurate. The initial position 0 point scale of the tool is flush with the reading mark surface, so that the moving distance is convenient to read. Only one circular arc is measured, so that the diameter of the corresponding circle is obtained, the structure and space influence is small, the reading can be locked after measurement is completed, and the reading is removed, which is more convenient.

[0087] The various embodiments are described in the specification by progressive stages, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. The above description of the disclosed embodiments enables those skilled in the art to implement or use the utility model. Various modifications of the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tooling for measuring the diameter of a shaft or hole by measuring the chord length, characterized in that: A vertical mounting hole is provided in the middle of the fixed jaw; two downward-extending measuring jaws are provided on both sides of the fixed jaw; the distance from the lower end of the two measuring jaws to the axis of the mounting hole is the same; the outer surface of the scale fits through the mounting hole of the fixed jaw, and the outer surface of the scale is provided with a size scale. When the bottom end of the measuring jaw and the bottom end of the scale are in a straight line, the 0 point scale on the scale is flush with the upper side of the fixed jaw; when measuring the shaft diameter: the bottom ends of the two measuring jaws and the bottom end of the scale are in contact with the cylindrical surface of the shaft diameter; when measuring the hole diameter: the bottom ends of the two measuring jaws and the bottom end of the scale are in contact with the cylindrical surface of the hole diameter.

2. The tooling for measuring the diameter of a shaft or hole by means of chord length as described in claim 1, characterized in that: The fixed jaw includes a digital display unit; the vertical mounting hole is located in the middle of the digital display unit; the digital display unit has a display unit, a calibration button, and a switching button.

3. The tooling for measuring the diameter of a shaft or hole by means of chord length as described in claim 1, characterized in that: The upper side of the fixed claw is flat.

4. The tooling for measuring the diameter of a shaft or hole by means of chord length as described in claim 1, characterized in that: The bottom of the measuring jaws is pointed, and the bottom of the ruler is also pointed.

5. The tooling for measuring the diameter of a shaft or hole by means of chord length as described in claim 1, characterized in that: The mounting hole is cylindrical, and the cylindrical surface on the outer surface of the scale fits through the mounting hole.

6. The tooling for measuring the diameter of a shaft or hole by means of chord length as described in claim 2, characterized in that: A locking device is provided on the side of the digital display unit.

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