A test device for X-ray cable deflectometer error

Abstract

A test device for the error of an X-ray cable deflectometer includes, from the rear end to the front end, a rotatable handle, a pulley sleeve, a threaded sleeve, a connector, and a calibrator. The pulley sleeve is respectively provided with at least one set of centering pulley assemblies near the front and rear ends; the front end of the rotatable handle extends into the pulley sleeve, the threaded section at the front end extends from the pulley sleeve, and the rotatable handle at the rear end is stuck outside the pulley sleeve; the internal thread of the threaded section of the rotatable handle is connected to one end of the connector, and the external thread of the rotatable handle is matched with the threaded sleeve; the other end of the connector is connected to the calibrator; the calibrator includes three specifications: a single metal rod, a metal concentric rod with an insulating layer, and a metal eccentric rod with an insulating layer. The present invention tests three values ​​of cable metal core diameter, insulating layer wall thickness, and eccentricity error, thereby ensuring the accuracy of calibration of the X-ray cable deflectometer.

Description

[Technical field]

[0001] The present invention relates to the technical field of testing devices for wire and cable detection instruments, and in particular to a testing device for an error of an X-ray cable deflectometer. [Background technology]

[0002] In the cable structure, the non-concentricity between the intermediate metal core conductor and the insulation layer is called cable eccentricity. Cable eccentricity is an important technical indicator of cable quality. If the eccentricity is too large, the thin-walled side of the insulation layer may be burned through, posing a safety hazard.

[0003] Traditionally, cable eccentricity measurement is performed by cross-sectional slicing, that is, a thin slice of a certain cross section of the cable is cut and tested under an imager, projector or tool microscope. However, slicing measurement is an offline measurement method and a post-measurement method. If the test fails, the entire bundle of cables needs to be scrapped, resulting in great waste.

[0004] The X-ray cable deflectometer is a system that combines multiple high technologies. It integrates X-ray tomography technology, high-speed scanning technology and advanced signal processing technology. It is mainly used to measure the wall thickness, eccentricity, ovality, cable diameter, etc. of each layer of multi-layer insulated cables on cross-linking production lines.

[0005] However, there is almost no research on the calibration of X-ray cable deflectometers in China. If the measurement data of the X-ray cable deflectometer is inaccurate, it will directly lead to the failure of the entire cable product or even a whole batch of cables, causing serious safety hazards and economic losses.

[0006] At present, the calibration of X-ray cable deflectometers in China is only completed by manufacturers during maintenance and repair, and there are the following two shortcomings: 1. The manufacturer only tests the X-ray cable deflectometer for the measurement error of the cable metal core diameter through the outer diameter test rod, and then calibrates the X-ray cable deflectometer based on the error value, and does not test the two values ​​of the cable insulation layer wall thickness and eccentricity error. For cable factories, the most concerned are the wall thickness and eccentricity errors, but the manufacturer cannot provide calibration for the two values ​​of wall thickness and eccentricity errors. Therefore, even after the manufacturer's maintenance and calibration, the X-ray cable deflectometer still has the problem of inaccurate measurement data. 2. When the manufacturer is repairing and maintaining, it is necessary to remove the casing component connecting the front end of the X-ray cable deflectometer to the cable equipment and complete it when there is no cable in it. This causes great trouble to the cable factory users, because the cable pulling threading and casing connection installation are equivalent to reinstalling the equipment, which is time-consuming, labor-intensive and costly.

[0007] In view of this, the inventor conducted in-depth research on the defects of the prior art, and thus came up with this case. [Summary of the invention]

[0008] The technical problem to be solved by the present invention is to provide a convenient and fast testing device for the error of an X-ray cable deflectometer, which can test three values ​​of the cable metal core diameter, the insulation layer wall thickness and the eccentricity error, thereby ensuring the calibration accuracy of the X-ray cable deflectometer.

[0009] The present invention is achieved in that:

[0010] A device for testing an error of an X-ray cable deflectometer comprises, from the rear end to the front end, a rotatable handle, a pulley sleeve, a threaded sleeve, a connector, and a calibrator, wherein at least one set of centering pulley assemblies is respectively sleeved near the front and rear ends of the pulley sleeve;

[0011] The rotatable handle is a hollow structure, and comprises, from the rear end to the front end, a handle section, an extension section, and a thread section; the outer diameter of the handle section is larger than the outer diameters of the extension section and the thread section; the thread section has an internal thread and an external thread;

[0012] The front end of the rotatable handle extends into the pulley sleeve, the threaded section at the front end extends out from the pulley sleeve, and the handle section of the rotatable handle at the rear end is stuck outside the pulley sleeve;

[0013] The internal thread of the threaded section of the rotatable handle is connected to one end of the connector, and the external thread is matched with the threaded sleeve; the other end of the connector is connected to the calibrator; the connector is a hollow structure;

[0014] The calibrator is a hollow structure used for testing the error of the X-ray cable deflectometer, and includes three specifications: a single metal rod, a concentric rod with a metal insulating layer, and an eccentric rod with a metal insulating layer; the specification of the connector is compatible with the specification of the calibrator;

[0015] Each group of the centering pulley assembly comprises: a first sleeve ring and a second sleeve ring arranged side by side, the first sleeve ring is evenly spaced with at least three hinged seats, and the corresponding second sleeve ring is provided with at least three columns with notches in the middle; a connecting rod is arranged between each hinged seat and the corresponding column, one end of each connecting rod is hinged to the hinged seat, and the other end extends through the notch in the middle of the column to the other side, and is connected to a pulley at the end; a spring is also arranged in the notch in the middle of each column, one end of the spring is fixedly connected to the bottom of the column, and the other end is connected to the bottom of the connecting rod extending into the notch;

[0016] During the test, the calibrator at the front end of the test device is extended into the interior of the X-ray cable deflectometer to be tested, and the pulley sleeve with the centering pulley assembly is just located in the sleeve at the front end of the X-ray cable deflectometer to be tested, and the pulleys of each set of the centering pulley assembly are against the inner wall of the sleeve to ensure that the rotatable handle in the pulley sleeve remains concentric with the sleeve.

[0017] Furthermore, one end of the connector is an external thread, and the other end is an internal thread; the external thread at one end of the connector matches and connects with the internal thread of the threaded section of the rotatable handle, and the internal thread at the other end is connected to the calibrator.

[0018] The advantages of the present invention are: 1. The present invention can test the three values ​​of the cable metal core diameter, the insulation layer wall thickness and the eccentricity error, thereby ensuring the accuracy of the calibration of the X-ray cable deflectometer, and better meeting the actual needs of the cable factory for using the instrument. 2. With the test device of the present invention, the centering pulley is automatically centered in the front end casing of the X-ray cable deflectometer, and the eccentricometer can be calibrated without disassembling the casing. The entire test device is a hollow structure, and the cable can pass through it. The X-ray cable deflectometer can be calibrated without removing the cable line, which saves the removal and installation costs and makes the calibration more convenient and quick.

Brief Description of the Drawings

[0019] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0020] Figure 1 It is the front view of the present invention.

[0021] Figure 2 It is a schematic diagram of the decomposition structure of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the centering pulley assembly in the present invention.

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the present invention.

[0024] Figure 5 It is a schematic diagram of the use state of the present invention. [Specific implementation method]

[0025] like Figures 1 to 5 As shown, a testing device for an X-ray cable deflectometer error includes, from the rear end to the front end, a rotatable handle 1, a pulley sleeve 2, a threaded sleeve 3, a connector 4, and a calibrator 5. A group of centering pulley assemblies 6 are respectively provided near the front and rear ends of the pulley sleeve 2.

[0026] The rotatable handle 1 is a hollow structure, and comprises, from the rear end to the front end, a handle section 11, an extension section 12, and a threaded section 13; the outer diameter of the handle section 11 is larger than the outer diameters of the extension section 12 and the threaded section 13; the threaded section 13 has an external thread and an internal thread.

[0027] The front end of the rotatable handle 1 extends into the pulley sleeve 2 , the threaded section 13 at the front end extends out from the pulley sleeve 2 , and the handle section 11 of the rotatable handle 1 at the rear end is clamped outside the pulley sleeve 2 .

[0028] The internal thread of the threaded section 13 of the rotatable handle is connected to one end of the connector 4 , and the external thread cooperates with the threaded sleeve 2 to limit its axial movement; the other end of the connector 4 is connected to the calibrator 5 .

[0029] The connector 4 is a hollow structure, one end of the connector 4 is an external thread, and the other end is an internal thread; the external thread at one end of the connector 4 matches and connects with the internal thread of the threaded section 13 of the rotatable handle 1, and the internal thread at the other end is connected to the calibrator 5.

[0030] The calibrator 5 is a hollow structure, used for testing the error of the X-ray cable deflectometer 100 , and includes three specifications: a single metal rod, a metal concentric rod with an insulating layer, and a metal eccentric rod with an insulating layer. The specifications of the connector 4 are adapted to those of the calibrator 5 .

[0031] like Figure 3 As shown, the centering pulley assembly 6 includes: a first ring 61 and a second ring 62 arranged side by side, six articulated seats 63 are evenly spaced on the first ring 51, and the corresponding second ring 62 is provided with six columns 64 with notches in the middle; a connecting rod 65 is arranged between each articulated seat 63 and the corresponding column 64, one end of each connecting rod 65 is hinged to the articulated seat 63, and the other end passes through the notch in the middle of the column 64 and extends to the other side, and is connected to a pulley 66 at the end; a spring 67 is also arranged in the notch in the middle of each column 64, one end of the spring 67 is fixedly connected to the bottom of the column 64, and the other end is connected to the bottom of the connecting rod 65 extending into the notch.

[0032] like Figure 5 As shown, during the test, the calibrator 5 at the front end of the present invention is extended into the interior of the X-ray cable deflectometer 100 to be tested, and the pulley sleeve 2 with two centering pulley assemblies 6 is just located in the sleeve 102 at the front end of the X-ray cable deflectometer 100 to be tested, and the pulley 66 of each centering pulley assembly 6 is against the inner wall of the sleeve 102 to ensure that the rotatable handle 1 in the pulley sleeve 2 remains concentric with the sleeve 102.

[0033] The pulley 66 is in an open state under the action of the spring 67, and the spacing between the two sets of centering pulley assemblies 6 is adjustable; the threaded sleeve 3 is matched with the threaded section 13 (external thread) of the rotatable handle 1 through the internal thread, so that the rotatable handle 1 and the pulley sleeve 2 can only rotate without axial movement; the connector 4 is a hollow structure, one end is connected to the internal thread of the threaded section 13 of the rotatable handle 1, and the other end is connected to the calibrator 5, which has various specifications; the calibrator 5 is used to measure the error of the deflectometer, and is a hollow structure, connected to the rotatable handle 1 through the connector 4, and has various specifications such as a single metal rod, a metal concentric rod with an insulating layer, and a metal eccentric rod with an insulating layer. The specific operation includes the following steps:

[0034] Step 1: Fix the centering pulley assembly 6 and lock the threaded sleeve 2;

[0035] Step 2: Select the calibrator 5 and the connector 4 of the corresponding specification, and connect the calibrator 5 to the rotatable handle 1;

[0036] Step 3: Let the cable 200 pass through the entire test device;

[0037] Step 4: insert the test device through the casing 102, and the centering pulley assembly 6 automatically centers the test device in the casing 102, and suspends the calibrator 5 at the front end inside the X-ray cable deflectometer 100;

[0038] Step 5: Start the X-ray cable deflectometer 100. When the calibrator 5 is a single metal rod, the X-ray cable deflectometer 100 is set to a single diameter measurement mode. The difference between the diameter measured by the X-ray cable deflectometer 100 and the actual diameter value of the metal rod is the metal core measurement error. When the calibrator 5 is a concentric rod with a metal insulating layer, the X-ray cable deflectometer 100 is set to a single-layer PE measurement mode. The difference between the insulation thickness measured by the X-ray cable deflectometer 100 and the actual insulation thickness of the concentric rod is the wall thickness measurement error. When the calibrator 5 is an eccentric rod with a metal insulating layer, the X-ray cable deflectometer 100 is also set to a single-layer PE measurement mode. The difference between the eccentricity value measured by the X-ray cable deflectometer 100 and the actual eccentricity value of the eccentric rod is the eccentricity measurement error.

[0039] Step 6: Pull out the test device of the present invention, replace the front-end calibrator as needed, repeat steps 2, 3, 4, and 5, and measure again with the X-ray cable deflectometer 100 to obtain the measurement error of metal cores with different diameters, the measurement error of different wall thicknesses, and the measurement error of different eccentricity values.

[0040] The present invention can test three values ​​of cable metal core diameter, insulation layer wall thickness and eccentricity error, ensuring the accuracy of calibration of the X-ray cable deflectometer, and better meeting the actual needs of the cable factory for using the instrument. With the test device of the present invention, the centering pulley assembly is automatically centered in the front end casing of the X-ray cable deflectometer, and the eccentricometer can be calibrated without disassembling the casing. The entire test device is a hollow structure, and the cable can pass through it. The X-ray cable deflectometer can be calibrated without removing the cable line, saving the removal and installation costs, and the calibration is more convenient and quick.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for testing the error of an X-ray cable deflectometer, characterized in that: The components include, from the rear end to the front end, a rotatable handle, a pulley sleeve, a threaded sleeve, a connector, and a calibrator. The pulley sleeve is provided with at least one set of centering pulley assemblies near the front and rear ends. The rotatable handle is a hollow structure, and comprises, from the rear end to the front end, a handle section, an extension section, and a thread section; the outer diameter of the handle section is larger than the outer diameters of the extension section and the thread section; the thread section has an internal thread and an external thread; The front end of the rotatable handle extends into the pulley sleeve, the threaded section at the front end extends out from the pulley sleeve, and the handle section of the rotatable handle at the rear end is stuck outside the pulley sleeve; The internal thread of the threaded section of the rotatable handle is connected to one end of the connector, and the external thread is matched with the threaded sleeve; the other end of the connector is connected to the calibrator; the connector is a hollow structure; The calibrator is a hollow structure used for testing the error of the X-ray cable deflectometer, and includes three specifications: a single metal rod, a concentric rod with a metal insulating layer, and an eccentric rod with a metal insulating layer; the specification of the connector is compatible with the specification of the calibrator; Each group of the centering pulley assembly comprises: a first sleeve ring and a second sleeve ring arranged side by side, the first sleeve ring is evenly spaced with at least three hinged seats, and the corresponding second sleeve ring is provided with at least three columns with notches in the middle; a connecting rod is arranged between each hinged seat and the corresponding column, one end of each connecting rod is hinged to the hinged seat, and the other end extends through the notch in the middle of the column to the other side, and is connected to a pulley at the end; a spring is also arranged in the notch in the middle of each column, one end of the spring is fixedly connected to the bottom of the column, and the other end is connected to the bottom of the connecting rod extending into the notch; During the test, the calibrator at the front end of the test device is extended into the interior of the X-ray cable deflectometer to be tested, and the pulley sleeve with the centering pulley assembly is just located in the sleeve at the front end of the X-ray cable deflectometer to be tested, and the pulleys of each set of the centering pulley assembly are against the inner wall of the sleeve to ensure that the rotatable handle in the pulley sleeve remains concentric with the sleeve.

2. A device for testing an error of an X-ray cable deflectometer as claimed in claim 1, characterized in that: One end of the connector is an external thread, and the other end is an internal thread; the external thread at one end of the connector matches and connects with the internal thread of the threaded section of the rotatable handle, and the internal thread at the other end is connected with the calibrator.

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