A non-contact device for measuring the internal axis straightness of thin-walled long cylinders

Abstract

The present invention discloses a device for non-contact measurement of the internal axial straightness of a thin-walled long tube, comprising: a base, a support arm, a limit device, a support structure, a transmission device and a laser sensor array; one end face of the support arm is connected to the left side of the base by a screw, and the other end is suspended in the air, so as to facilitate insertion of the thin-walled long tube to be measured; the limit device is fixedly mounted on the top end of the left side of the base by a screw, and is used for limiting the thin-walled long tube to be measured on the support arm, so as to avoid friction between the thin-walled long tube to be measured and the support arm during rotation; the support structure comprises two groups of V-shaped bearing support structures, which are used for supporting the thin-walled long tube to be measured; the transmission device is fixedly mounted on the base, and is used for driving the thin-walled long tube to be measured on the support arm to rotate; the laser sensor array is evenly arranged on the support arm along the axial direction of the support arm, and is used for measuring the geometric center data of multiple cross sections of the thin-walled long tube to be measured during rotation of the thin-walled long tube to be measured.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, in particular to a device for non-contact measurement of the inner axis straightness of a thin-walled long cylinder. Background Art

[0002] The thin-walled long tube being tested has the characteristics of "long length, small aperture, and thin wall easily deformed by force". The space inside the hole that can be used to directly detect the straightness of the deep hole is very limited, and the operation is relatively difficult.

[0003] The prior art discloses a device for measuring the internal axial straightness of a thin-walled long tube. This device uses a measurement method in which the thin-walled long tube being measured rotates while the sensor is fixed. The sensors form a linear array and contact the inner wall of the thin-walled long tube being measured. A V-bearing support serves as the rotation reference of the thin-walled long tube being measured. When the thin-walled long tube being measured rotates 360 degrees, the sensor can collect data and calculate the straightness error of the thin-walled long tube being measured. However, during the measurement process of this method, the contact displacement sensor used will always maintain contact with the inner wall of the thin-walled long tube being measured during the rotation of the thin-walled long tube being measured. The sensor probe will cause irreversible damage to the inner wall of the thin-walled long tube being measured, forming scratches. At the same time, due to the high requirements of the spatial installation position of the contact displacement sensor, it cannot be densely distributed and detailed internal data of the thin-walled long tube being measured cannot be collected. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for non-contact measurement of the internal axis straightness of a thin-walled long cylinder in order to address the technical defects in the prior art.

[0005] The technical solution adopted to achieve the purpose of the present invention is:

[0006] A device for non-contact measurement of the internal axis straightness of a thin-walled long cylinder, comprising: a base, a support arm, a limit device, a support structure, a transmission device, and a laser sensor array, wherein:

[0007] One end surface of the support arm is connected to the left side of the base by a screw, and the other end is suspended in the air to facilitate insertion into the thin-walled long tube to be measured;

[0008] The limiting device is fixedly installed on the top of the left side of the base by screws, and is used to limit the thin-walled long tube to be measured on the support arm to prevent the thin-walled long tube to be measured from rubbing against the support arm when rotating;

[0009] The support structure includes two sets of V-shaped bearing support structures, and the V-shaped bearing support structures are used to support the thin-walled long cylinder to be measured;

[0010] The transmission device is fixedly mounted on the base and is used to drive the thin-walled long tube to be measured on the support arm to rotate;

[0011] The laser sensor array is composed of multiple sensors, which are evenly distributed on the support arm along the axial direction of the support arm and are used to measure the geometric center data of multiple cross sections of the thin-walled long tube being measured during its rotation.

[0012] In the above technical solution, a bearing is provided in the limiting device.

[0013] In the above technical solution, the limiting device is also used to prevent the thin-walled long cylinder to be measured from axial movement during the rotation process.

[0014] In the above technical solution, the V-shaped bearing support structure is also used as a rotation reference for the thin-walled long tube to be measured.

[0015] In the above technical solution, each set of V-shaped bearing support structures consists of a V-shaped bearing bracket and two support bearings.

[0016] In the above technical solution, the V-shaped bearing bracket is fixedly connected to the support arm via fixing bolts.

[0017] In the above technical solution, the support bearings are fixedly mounted on both ends of the V-shaped bearing bracket by bolts.

[0018] In the above technical solution, the effective contact width of the support bearing is 6 mm, and the two support bearings of each set of V-shaped bearing support structures are applied to the same cross section, relying on the self-gravity of the thin-walled long tube to be measured to form a two-point support structure.

[0019] In the above technical solution, the transmission device includes a pitch drive cylinder, a pitch support rod, a sliding plate, a horizontal drive cylinder and a guide rail.

[0020] In the above technical solution, the pitch cylinder is connected to the pitch support rod and is used to drive the pitch support rod to perform pitch swing.

[0021] In the above technical solution, the sliding plate and the horizontal driving cylinder are respectively installed on the guide rail, and the horizontal driving cylinder is used to drive the sliding plate to move horizontally along the guide rail.

[0022] A method for using a device for non-contact measurement of the internal axis straightness of a thin-walled long cylinder, the method comprising:

[0023] Step 1: Start the transmission device. After the transmission device is raised, insert the thin-walled long tube to be measured into the support arm. One end of the thin-walled long tube to be measured is pressed against the limit device and is limited by the bearing of the limit device.

[0024] Step 2: Start the transmission device again to drive the thin-walled long tube to be measured on the support arm to rotate, and start the laser sensor arranged on the support arm to measure the geometric center data of multiple cross sections of the thin-walled long tube to be measured;

[0025] Step 3: The laser sensor transmits the measured geometric center data to the computer, and the computer automatically calculates and outputs the measurement data.

[0026] In the above technical solution, the measurement data output by the computer is the internal axis straightness of the thin-walled long tube being measured.

[0027] In the above technical solution, when measuring the geometric center data of multiple cross sections of the thin-walled long tube to be measured, the thin-walled long tube to be measured automatically stops after rotating one circle.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The non-contact device for measuring the internal axial straightness of a thin-walled long tube of the present invention is provided with a limiting device for limiting the thin-walled long tube to be measured on the support arm to avoid friction when the thin-walled long tube to be measured rotates, and at the same time, prevent the axial movement of the thin-walled long tube to be measured during the rotation process.

[0030] 2. The present invention adopts a measurement scheme of densely distributed and rotating non-contact laser displacement sensor arrays and a thin-walled long tube to be measured. The thin-walled long tube to be measured rotates one circle, and the geometric center data of multiple cross sections are obtained through the sensor array.

[0031] 3. The present invention only takes about 1 minute on average to measure the straightness of each extra-long rotating cylinder. Compared with the previous contact method that caused scratches on the inner wall of the thin-walled long cylinder being measured, it has achieved a great breakthrough. In addition, the required part can be flexibly selected on the computer to calculate the straightness, and the calculation result is highly accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Shown is a front view of the structure of the device for non-contact measurement of the internal axis straightness of a thin-walled long cylinder according to the present invention.

[0033] Figure 2 Shown is a schematic structural diagram of the limiting device of the present invention.

[0034] Figure 3 Shown is a schematic diagram of the V-bearing support structure of the present invention.

[0035] Figure 4 Shown is a side view of the transmission structure of the present invention.

[0036] Figure 5 Shown is a front view of the structure of the device for non-contact measurement of the inner axis straightness of a vertical thin-walled long cylinder according to the present invention.

[0037] In the figure: 1-base, 2-support arm, 3-limiting device, 3-1-bearing, 4-support structure, 4-1-V-bearing bracket, 4-2-support bearing, 5-transmission device, 5-1-pitch drive cylinder, 5-2-pitch support rod, 5-3-sliding plate, 5-4-guide rail, 6-laser sensor array, 7-support base, 8-vertical pole, 9-special rotatable clamp for long cylinder, 10-measuring axis, 11-vertical laser displacement sensor array. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] Example 1

[0040] A non-contact device for measuring the internal axis straightness of thin-walled long cylinders, see Figure 1 The device comprises: a base 1, a support arm 2, a limiting device 3, a support structure 4, a transmission device 5 and a laser sensor array 6, wherein:

[0041] One end surface of the support arm 2 is connected to the left side of the base 1 through a screw, and the other end is suspended in the air to facilitate insertion into the thin-walled long tube to be measured.

[0042] See also Figure 2 The limiting device 3 is fixedly installed on the top of the left side of the base 1 by screws. A bearing 3-1 is provided in the limiting device 3. The bearing 3-1 is used to limit the thin-walled long tube to be measured on the support arm 2 to avoid friction between the thin-walled long tube to be measured and the support arm 2 during rotation. At the same time, the bearing 3-1 is also used to prevent the axial movement of the thin-walled long tube to be measured during rotation.

[0043] See also Figure 3 The support structure 4 includes two groups of V-shaped bearing support structures, each group of V-shaped bearing support structures consists of a V-shaped bearing bracket 4-1 and two support bearings 4-2, the V-shaped bearing bracket 4-1 is fixedly connected to the support arm 2 by fixing bolts, and the support bearings are fixedly installed at both ends of the V-shaped bearing bracket 4-1 by bolts; the V-shaped bearing support structure is used to support the thin-walled long tube to be measured, and serve as a rotation reference for the thin-walled long tube to be measured.

[0044] Furthermore, the effective contact width of the support bearing 4-2 is 6 mm, and the two support bearings of each set of V-shaped bearing support structures are applied to the same cross section, forming a two-point support structure relying on the self-gravity of the thin-walled long tube being measured.

[0045] See also Figure 4The transmission device 5 is fixedly mounted on the base 1 and is used to drive the thin-walled long tube to be measured on the support arm 2 to rotate; the transmission device includes a pitch drive cylinder 5-1, a pitch support rod 5-2, a sliding plate 5-3, a horizontal drive cylinder 5-4 and a guide rail 5-5; the pitch cylinder 5-1 is connected to the pitch support rod and is used to drive the pitch support rod 5-2 to pitch and swing; the sliding plate 5-2 and the horizontal drive cylinder 5-3 are respectively mounted on the guide rail 5-4, and the horizontal drive cylinder 5-3 is used to drive the sliding plate to move horizontally along the guide rail.

[0046] The laser sensor array 6 is composed of multiple sensors, which are evenly distributed on the support arm 2 along the axial direction of the support arm 2 and are used to measure the geometric center data of multiple cross sections of the thin-walled long tube being measured during its rotation.

[0047] The method for using the device for non-contact measurement of the internal axis straightness of a thin-walled long cylinder comprises the following steps:

[0048] Step 1: Start the transmission device 5. After the transmission support rod 5-2 is raised, insert the thin-walled long tube to be measured into the support arm 2. One end of the thin-walled long tube to be measured is pressed against the limit device 3 and is limited by the bearing 3-1 of the limit device 3.

[0049] Step 2: Start the transmission device 5 again to drive the thin-walled long tube to be measured on the support arm 2 to rotate, and start the laser sensor arranged on the support arm to measure the geometric center data of multiple cross sections of the thin-walled long tube to be measured;

[0050] Step 3: The laser sensor transmits the measured geometric center data to the computer, and the computer automatically calculates and outputs the measurement data.

[0051] The measurement data output by the computer is the internal axis straightness of the thin-walled long tube being measured.

[0052] Furthermore, when measuring the geometric center data of multiple cross sections of the thin-walled long tube being measured, the thin-walled long tube being measured automatically stops after rotating one circle.

[0053] Example 2

[0054] On the basis of Example 1, the device for non-contact measurement of the internal axis straightness of a thin-walled long cylinder also includes a device for non-contact measurement of the internal axis straightness of a vertical thin-walled long cylinder, see Figure 5 The device comprises: a support base 7, a vertical rod 8, a rotatable fixture 9 for a long tube, a measuring axis 10 and a vertical laser displacement sensor array 11 arranged on the measuring axis, wherein:

[0055] The vertical rod 8 is vertically fixed on the supporting base 7, and the special rotatable clamp 9 for long tubes is connected to the top of the vertical rod 8 through a connecting component, which is used to fix the clamping position of the thin-walled long tube to be measured and drive the thin-walled long tube to be measured to rotate; wherein, the special rotatable clamp 9 for long tubes can be in two states: parallel to the vertical rod 8 or at a 90° angle to the vertical rod 8.

[0056] The top end of the measuring shaft 10 is fixedly installed in the middle position of the long cylinder special rotatable clamp 9 by a nut. The vertical laser displacement sensor array 11 consists of multiple sensors evenly distributed on the measuring shaft 10 along the axial direction of the measuring shaft 10, and is used for non-contact measurement of the geometric center data of multiple sections of the thin-walled long cylinder being measured.

[0057] A method for using the device for non-contact measurement of the inner axis straightness of a vertical thin-walled long cylinder comprises:

[0058] Step 1: Start the special rotatable fixture 9 for long tubes and rotate it to form a 90° angle with the vertical rod 8. Insert the thin-walled long tube to be measured into the measuring shaft 10 and fix the clamping position of the thin-walled long tube to be measured with the special rotatable fixture 9 for long tubes. Then rotate the special rotatable fixture 9 for long tubes to be parallel with the vertical rod 8.

[0059] Step 2: Start the vertical laser displacement sensor array 11 arranged on the measuring axis 10 to measure the geometric center data of multiple cross sections of the thin-walled long tube to be measured;

[0060] In step 3, the vertical laser displacement sensor array 11 transmits the measured geometric center data to the computer, and the computer automatically calculates and outputs the measurement data to obtain the internal axis straightness of the thin-walled long tube being measured.

[0061] The above is an exemplary description of the present invention. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by other skilled in the art without expending creative labor falls within the scope of protection of the present invention.

Claims

1. A device for non-contact measurement of the internal axis straightness of a thin-walled long cylinder, characterized in that: The device comprises: a base, a support arm, a limiting device, a support structure, a transmission device and a laser sensor array, wherein: One end surface of the support arm is connected to the left side of the base by a screw, and the other end is suspended in the air to facilitate insertion into the thin-walled long tube to be measured; The limiting device is fixedly installed on the top of the left side of the base by screws, and is used to limit the thin-walled long tube to be measured on the support arm to prevent the thin-walled long tube to be measured from rubbing against the support arm when rotating; The support structure includes two sets of V-shaped bearing support structures, and the V-shaped bearing support structures are used to support the thin-walled long tube to be measured and serve as a rotation reference for the thin-walled long tube to be measured; The transmission device is fixedly mounted on the base and is used to drive the thin-walled long tube to be measured on the support arm to rotate; The laser sensor array is composed of a plurality of sensors, which are evenly distributed on the support arm along the axial direction of the support arm and are used to measure the geometric center data of multiple cross sections of the thin-walled long tube being measured during its rotation; The transmission device includes a pitch drive cylinder, a pitch support rod, a sliding plate, a horizontal drive cylinder and a guide rail; The pitch drive cylinder is connected to the pitch support rod and is used to drive the pitch support rod to pitch and swing; The sliding plate and the horizontal driving cylinder are respectively installed on the guide rails, and the horizontal driving cylinder is used to drive the sliding plate to move in the horizontal direction along the guide rails.

2. The device according to claim 1, characterized in that A bearing is provided in the limiting device.

3. The device according to claim 1, characterized in that The limiting device is also used to prevent the thin-walled long cylinder to be measured from axial movement during the rotation process.

4. The device according to claim 1, characterized in that The V-shaped bearing support structure is also used as a rotation reference for the thin-walled long cylinder to be measured.

5. The device according to claim 1, characterized in that Each set of V-bearing support structures consists of a V-bearing bracket and two support bearings.

6. The device according to claim 5, characterized in that The V-shaped bearing bracket is fixedly connected to the support arm via fixing bolts.

7. The device according to claim 5, characterized in that The support bearings are fixedly mounted on both ends of the V-shaped bearing bracket by bolts.

8. The device according to claim 5, characterized in that The effective contact width of the support bearing is 6 mm. The two support bearings of each set of V-shaped bearing support structures are applied to the same cross section, and rely on the self-gravity of the thin-walled long tube to be measured to form a two-point support structure.

9. The method for using the device for non-contact measurement of the internal axis straightness of a thin-walled long cylinder according to claim 1, characterized in that: The method comprises: Step 1: Start the transmission device. After the transmission device is raised, insert the thin-walled long tube to be measured into the support arm. One end of the thin-walled long tube to be measured is pressed against the limit device and is limited by the bearing of the limit device. Step 2: Start the transmission device again to drive the thin-walled long tube to be measured on the support arm to rotate, and start the laser sensor arranged on the support arm to measure the geometric center data of multiple cross sections of the thin-walled long tube to be measured; Step 3: The laser sensor transmits the measured geometric center data to the computer, and the computer automatically calculates and outputs the measurement data.

10. The method according to claim 9, characterized in that The measurement data output by the computer is the internal axis straightness of the thin-walled long tube being measured.

11. The method according to claim 10, characterized in that When measuring the geometric center data of multiple sections of the thin-walled long tube being measured, the thin-walled long tube being measured stops automatically after rotating one circle.

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