A tool and method for measuring inner and outer diameters of deformable thin-walled cylindrical parts

Abstract

The invention discloses a tool for measuring the inner and outer diameters of an easily deformed thin-walled cylindrical part, comprising a measuring base, a positioning rod, a sliding measuring rod and a vertical driving device. An airbag is installed on the sliding measuring rod, which is inflated to fit with the measured thin-walled cylinder. Since the pressure on the fitting surface is equal everywhere, the thin-walled cylinder is evenly stressed, and deformation of the thin-walled cylinder caused by transportation, storage or other reasons is corrected. An outer diameter measuring device, an inner diameter measuring device and an axial measuring device are arranged on the sliding measuring rod, which respectively measure the outer diameter, inner diameter and corresponding vertical distance of the measured thin-walled cylinder. The measuring method thereof is also disclosed. The invention can more accurately measure cylindrical structural parts, especially the inner diameter and outer diameter dimensions of thin-walled and easily deformed cylindrical structural parts, and effectively suppress the measurement error caused by deformation during measurement.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical measurement, and in particular relates to a tool for measuring the inner and outer diameters of an easily deformable thin-walled cylindrical part, and a measuring method thereof. Background Art

[0002] Thin-walled cylindrical metal structural parts that are easy to deform or non-metallic structural parts made of fiberglass are usually used as rotor sleeves or liner sleeves. They often involve sealing assembly and often have certain precision requirements on the size of such structural parts. It is particularly important to measure the inner and outer diameters of such structural parts.

[0003] However, thin-walled cylindrical structural parts that are easy to deform have poor radial stiffness and are very easy to deform into ellipses. Especially when conducting contact-type inner and outer diameter dimension inspections, using conventional measuring tools such as vernier calipers will increase the degree of deformation and affect the measurement accuracy. Therefore, conventional measuring tools and measurement methods are not suitable for such structural parts. Summary of the invention

[0004] In order to solve the above measurement problem, one of the objectives of the present invention is to provide a tool for measuring the inner and outer diameters of easily deformable thin-walled cylindrical parts.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problem is: a tool for measuring the inner and outer diameters of easily deformed thin-walled cylindrical parts, including a measuring base and a positioning rod connected and fixed to the measuring base, and also including a sliding measuring rod arranged on the positioning rod and capable of sliding in a vertical direction, and a vertical driving device for driving the sliding measuring rod to move in a vertical direction. An airbag is installed on the sliding measuring rod, which is inflated to fit the thin-walled cylinder to be measured. Since the pressure on the fitting surface is equal everywhere, the thin-walled cylinder is subjected to uniform force, and deformation of the thin-walled cylinder caused by transportation, storage or other reasons is corrected. The sliding measuring rod is provided with an outer diameter measuring device, an inner diameter measuring device and an axial measuring device, which respectively measure the outer diameter, inner diameter and corresponding vertical distance of the thin-walled cylinder to be measured.

[0006] Furthermore, the inner diameter measuring device is connected to the sliding measuring rod, and the outer diameter measuring device and the axial measuring device are connected to the sliding measuring rod through a connecting arm. The outer diameter measuring device, the inner diameter measuring device and the axial measuring device are mechanical, pressure or laser measuring devices that transmit data in wired or wireless form.

[0007] Furthermore, the airbag is cylindrical or spherical, the airbag is connected to the sliding measuring rod through an airbag fixing device, and is inflated and deflated through an airbag air inlet and outlet device.

[0008] Furthermore, the inner diameter measuring device, outer diameter measuring device and axial measuring device are respectively an outer diameter micrometer, an inner diameter micrometer and a vernier caliper.

[0009] The second object of the present invention is to provide a measuring method for measuring the inner and outer diameters of a deformable thin-walled cylindrical part, the steps of which are as follows: S1, placing the measuring base on a plane, and installing the positioning rod and the sliding measuring rod on the measuring base, and sequentially installing the outer diameter measuring device, the inner diameter measuring device and the axial measuring device on the sliding measuring rod; S2, place the thin-walled cylinder to be measured on the measuring base so that its center is located at the positioning rod; S3, installing the airbag on the sliding measuring rod, and adjusting the position of the airbag by the airbag fixing device; S4, inflate the airbag through the airbag inlet and outlet device, and maintain the pressure after the air pressure reaches the recommended value; S5, moving the sliding measuring rod in the vertical direction through the vertical driving device, so that the outside micrometer, the inside micrometer and the vernier caliper on the sliding measuring rod respectively measure the outside diameter, the inside diameter and the corresponding vertical position of the cylinder, and collecting data according to the type of the measuring device; S6. After the measurement is completed, the airbag is depressurized through the airbag air inlet and outlet device, the thin-walled cylinder to be measured is removed, and other tooling equipment is arranged.

[0010] Furthermore, when placing the measuring base in step S1, it should be ensured that the sliding measuring rod has sufficient vertical movement travel.

[0011] Furthermore, in step S5, data collection is performed manually, by wire or by wireless means.

[0012] The beneficial effect of the present invention is that the cylindrical structural part inner diameter measuring tool and measuring method proposed in the present invention can more accurately measure the inner diameter size of cylindrical structural parts, especially thin-walled and easily deformable cylindrical structural parts, and effectively suppress the measurement error caused by deformation during measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the tooling of the present invention.

[0014] The figures are marked as follows: 1—measuring base, 2—axial measuring device, 3—outer diameter measuring device, 4—inner diameter measuring device, 5—airbag fixing device, 6—connecting arm, 7—measured thin-walled cylinder, 8—sliding measuring rod, 9—positioning rod, 10—airbag, 11—vertical driving device, 12—airbag air inlet and outlet device. DETAILED DESCRIPTION

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the various components in the accompanying drawings are drawn in specific proportions, these proportional relationships are only exemplary, and those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0016] It should be noted that, in the description of the present invention, terms such as "center", "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operate in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0017] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example 1

[0018] According to an example of the present invention, referring to Figure 1 A tool for measuring the inner and outer diameters of an easily deformable thin-walled cylindrical part mainly comprises: a measuring base 1, a positioning rod 9 and a sliding measuring rod 8. The positioning rod 9 is fixedly mounted on the measuring base 1, and the movement of the sliding measuring rod 8 and the positioning rod 9 is limited to vertical sliding. The plane on which the measured thin-walled cylinder 7 is placed should have certain flatness requirements, and the measuring base 1 should ensure that the sliding measuring rod 8 has sufficient vertical movement travel.

[0019] The sliding measuring rod 8 is provided with an airbag 10, which is inflated to fit the measured thin-walled cylinder 7. Since the pressure on the fitting surface is equal everywhere, the thin-walled cylinder is evenly stressed, and deformation of the thin-walled cylinder caused by transportation, storage or other reasons is corrected.

[0020] The sliding measuring rod 8 is provided with an outer diameter measuring device 3, an inner diameter measuring device 4 and an axial measuring device 2, and the outer diameter, inner diameter and corresponding vertical distance of the measured thin-walled cylinder 7 are measured respectively when the sliding measuring rod 8 moves. The measuring device can be a mechanical, pressure and laser measuring device, but is not limited to the measuring device, and data can be transmitted in a wired or wireless manner. The inner diameter measuring device 4 is connected to the sliding measuring rod 8, and the outer diameter measuring device 3 and the axial measuring device 2 are connected to the sliding measuring rod 8 through a connecting arm 6.

[0021] The outer diameter measuring device 3, the inner diameter measuring device 4 and the axial measuring device 2 of this embodiment are respectively an outer diameter micrometer, an inner diameter micrometer and a vernier caliper. The inner diameter micrometer is connected to the sliding measuring rod 8, and the outer diameter micrometer and the axial measuring device 2 are connected to the sliding measuring rod 8 through a connecting arm 6.

[0022] The airbag 10 is generally cylindrical and is fixed to the sliding measuring rod 8 by an airbag fixing device 5. It is inflated and deflated by an airbag inlet and outlet device 12. There should be a pressure display of the airbag 10 on the inlet and outlet device. During measurement, the pressure of the airbag 10 should be within the recommended value to ensure that the thin-walled cylinder is evenly pressurized and will not be deformed due to excessive pressure of the airbag 10. Example 2

[0023] The present embodiment discloses a method for measuring the inner and outer diameters of a deformable thin-walled cylindrical part using a tool for measuring the inner and outer diameters of the deformable thin-walled cylindrical part, and the steps are as follows.

[0024] S1, place the measuring base 1 on a plane, and install the positioning rod 9 and the sliding measuring rod 8 on the measuring base 1, and install the outer diameter measuring device 3, the inner diameter measuring device 4 and the axial measuring device 2 on the sliding measuring rod 8 in sequence.

[0025] S2, placing the thin-walled cylinder 7 to be measured on the measuring base 1 so that its center is located at the positioning rod 9.

[0026] S3, installing the airbag 10 on the sliding measuring rod 8, and adjusting the position of the airbag 10 through the airbag fixing device 5.

[0027] S4, inflate the airbag 10 through the airbag air inlet and outlet device 12, and maintain the pressure after the air pressure reaches the recommended value.

[0028] S5, move the sliding measuring rod 8 in the vertical direction through the vertical driving device 11, so that the outside micrometer, inside micrometer and vernier caliper on the sliding measuring rod 8 respectively measure the outer diameter, inner diameter and corresponding vertical position of the cylinder, and collect data according to the type of measuring device (manual, wired, wireless, etc.).

[0029] S6, after the measurement is completed, the airbag 10 is depressurized through the airbag air inlet and outlet device 12, the measured thin-walled cylinder 7 is removed, and other tooling equipment is arranged. Example 3

[0030] In this embodiment, the airbag 10 is no longer cylindrical, but spherical or other shapes. In this embodiment, the airbag 10 is no longer arranged on the inner circle of the thin-walled cylinder 7 to be measured, but is arranged on the outer circle of the thin-walled cylinder 7 to be measured.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tool for measuring the inner and outer diameters of deformable thin-walled cylindrical parts, characterized in that: The invention comprises a measuring base (1) and a positioning rod (9) fixed on the measuring base (1), a sliding measuring rod (8) arranged on the positioning rod (9) and a vertical driving device (11) for driving the sliding measuring rod (8) to move in a vertical direction, an air bag (10) being installed on the sliding measuring rod (8), and an outer diameter measuring device (3), an inner diameter measuring device (4) and an axial measuring device (2) being arranged on the sliding measuring rod (8).

2. The inner and outer diameter measuring tool and measuring method of an easily deformable thin-walled cylindrical part according to claim 1, characterized in that: The inner diameter measuring device (4) is connected to the sliding measuring rod (8), and the outer diameter measuring device (3) and the axial measuring device (2) are connected to the sliding measuring rod (8) via a connecting arm (6). The outer diameter measuring device (3), the inner diameter measuring device (4) and the axial measuring device (2) are mechanical, pressure or laser measuring devices that transmit data in wired or wireless form.

3. The inner and outer diameter measuring tool and measuring method of an easily deformable thin-walled cylindrical part according to claim 2, characterized in that: The airbag (10) is cylindrical or spherical, and is connected to the sliding measuring rod (8) via an airbag fixing device (5), and is inflated and deflated via an airbag air inlet and outlet device (12).

4. The inner and outer diameter measuring tool and measuring method of an easily deformable thin-walled cylindrical part according to claim 2, characterized in that: The inner diameter measuring device (4), the outer diameter measuring device (3) and the axial measuring device (2) are respectively an outer diameter micrometer, an inner diameter micrometer and a vernier caliper.

5. A method for measuring the inner and outer diameters of a deformable thin-walled cylindrical part using a measuring tool as claimed in claim 1, characterized in that: The steps are: S1, placing a measuring base (1) on a plane, installing a positioning rod (9) and a sliding measuring rod (8) on the measuring base (1), and sequentially installing an outer diameter measuring device (3), an inner diameter measuring device (4), and an axial measuring device (2) on the sliding measuring rod (8); S2, placing the thin-walled cylinder (7) to be measured on the measuring base (1) so that its center is located at the positioning rod (9); S3, installing the airbag (10) on the sliding measuring rod (8), and adjusting the position of the airbag (10) by means of the airbag fixing device (5); S4, inflating the airbag (10) through the airbag air inlet and outlet device (12), and then maintaining the pressure; S5, moving the sliding measuring rod (8) in the vertical direction by means of the vertical driving device (11), so that the outer diameter micrometer, the inner diameter micrometer and the vernier caliper on the sliding measuring rod (8) respectively measure the outer diameter, the inner diameter and the corresponding vertical position of the cylinder, and collect data; S6, after the measurement is completed, the airbag (10) is depressurized through the airbag air inlet and outlet device (12), and the measured thin-walled cylinder (7) is removed.

6. The measuring method of the inner and outer diameter measuring tool of the deformable thin-walled cylindrical part according to claim 5 is characterized in that: When placing the measuring base (1) in step S1, it is ensured that the sliding measuring rod (8) has sufficient vertical movement travel.

7. The measuring method of the tool for measuring inner and outer diameters of an easily deformable thin-walled cylindrical part according to claim 5, characterized in that: In the step S5, data collection is performed manually, by wire or by wireless means.

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