Flexible joint eccentricity tester

Abstract

The invention relates to the technical field of flexible joint eccentricity testing, in particular to a flexible joint eccentricity tester which comprises fixing hoops fixed to the left end and the right end of a cable and an electric control base matched with the fixing hoops, and an electric control lifting rod matched with the fixing hoops is installed in the electric control base. Split type electric control assembly frames are movably assembled on the two sides of the fixing tightening hoop. According to the flexible joint eccentricity tester, the eccentricity size of a cable within the 360-degree range can be better measured, and the situation that the measured positions and directions are different cannot occur; the equipment is low in cost and simple to operate; the equipment adopts a split type structural design, and the distance between the testers on the two sides is changed by using the height-adjustable electric control base, so that the equipment can be adapted to cables with different lengths, and the application range is wider; by adopting the optical positioning technology, the testers on the two sides can rotate synchronously, so that the synchronism of the testers is controlled, and the accuracy of eccentricity detection is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of flexible joint eccentricity testing, in particular to a flexible joint eccentricity testing instrument. Background Art

[0002] As an important performance index of cables, eccentricity is not only of great significance to the production of cables, but also has an important impact on the actual application performance of cables. This test can determine whether the cable conductor is correctly located in the center of the insulation layer and whether the thickness of the insulation layer is uniform, thereby ensuring that the mechanical and electrical properties of the cable meet the design requirements. Cables with high eccentricity may cause excessive local electrical stress, which in turn affects the life and safety of the cable.

[0003] Flexible joint eccentricity tester is a device specially used to measure the uniformity of insulation thickness and conductor eccentricity of cable flexible joints. Since flexible joints are flexible in connection and are usually used in high voltage or ultra-high voltage applications, their insulation performance is crucial, so eccentricity testing is particularly important in quality control.

[0004] The main testing methods currently are as follows: X-ray measurement, photoelectromagnetic eccentricity detection, mechanical measurement, and capacitance method.

[0005] Among them, X-ray eccentricity detection has the advantage of being a non-contact measurement. The thickness of the cable insulation layer can be obtained by measuring the outer diameter of the cable, and the eccentricity can be finally calculated according to the definition of eccentricity. It has a wide range of applications for three-layer co-extruded cross-linked polyethylene cables and some cables with relatively large thicknesses. The disadvantage is that X-rays are highly radioactive and will definitely cause great harm to the human body. In addition, the eccentricity detection equipment is relatively expensive and is not suitable for single-core cables of smaller size.

[0006] Optical electromagnetic eccentricity detection: The advantages are non-contact measurement, reliable performance, and high accuracy. The disadvantages are that high-frequency current is often required during use, the actual operability is very poor, and the thickness of the insulation layer can only be measured at 4 points. In addition, the calibration of this detection method is also difficult, the equipment itself is bulky and requires a large number of expensive optical devices.

[0007] Eddy current eccentricity detection: The eddy current eccentricity detection system consists of a magnetic field generator and a power detector. It mainly uses eddy current ranging technology to calculate the change in displacement by using the difference in power loss between the conductor and the magnetic field. The advantage is that it can realize online real-time detection without cutting samples. It is suitable for automated detection of large-scale production lines. The disadvantage is that the accuracy is limited, it is greatly affected by the stability of cable movement and surface quality, and requires calibration and complex algorithm support.

[0008] Mechanical measurement method: This method is suitable for simple tests in laboratories or non-mass production environments. Usually, a vernier caliper is used to record the thickness data of the cable in each direction, calculate the maximum thickness and the minimum thickness, and then determine whether the eccentricity requirements are met based on the test data. However, considering that the measurement position cannot be guaranteed to be a perfect circle when using a vernier caliper to measure data, this will affect the test results; at the same time, it is only suitable for rough measurements; and this mechanical measurement method cannot adapt to cables of different lengths, and it is also impossible to perform optical inspections on the inside and outside simultaneously. Summary of the invention

[0009] The technical problem to be solved by the present invention is that the current mechanical measurement method cannot ensure that the measurement position is a perfect circle, which will affect the detection result; at the same time, it is only suitable for rough measurement; it cannot adapt to cables of different lengths, and it cannot perform optical detection on the inside and outside simultaneously.

[0010] The technical solution adopted by the present invention to solve its technical problems is: a flexible joint eccentricity tester, including a fixed clamp for fixing on the left and right ends of a cable and an electric control base matched with the fixed clamp, an electric control lifting rod matched with the fixed clamp is installed inside the electric control base, both sides of the fixed clamp are movably equipped with a split electric control assembly frame, the outer side of the split electric control assembly frame is equipped with an external electric control guide rail, the inner side of the external electric control guide rail is movably equipped with a built-in electric control adjustment module, and an optical detection probe is fixedly equipped on the built-in electric control adjustment module.

[0011] The fixing clamp comprises a first assembly cover and a second assembly cover having first locking frames on both sides, and the first assembly cover and the second assembly cover are fixedly assembled by bolts on the first locking frame.

[0012] The split electric control assembly frame includes a third assembly cover and a fourth assembly cover with second locking frames on both sides, an arc-shaped transmission port opened inside the third assembly cover and the fourth assembly cover, an outer mounting seat fixed on the outer side of the arc-shaped transmission port, and a driving adjustment wheel movably assembled inside the arc-shaped transmission port, and the third assembly cover and the fourth assembly cover are fixedly assembled by screws on the second locking frame.

[0013] The electric control base comprises an assembly base of a triangular structure, a bottom-mounted regulating wheel movably mounted at the lower end of the assembly base, and a storage battery fixedly mounted inside the assembly base.

[0014] An upper lifting groove is provided on the upper surface of the assembly base, and the electric lifting rod includes an electric lead screw movably installed inside the upper lifting groove and an internal lifting plate threadedly engaged with the electric lead screw, and the internal lifting plate is fixedly assembled with the second locking frame.

[0015] The external electric control guide rail includes a fixed detection guide rail fixedly mounted on a split electric control assembly frame on one side of a fixed tight hoop, a flip detection guide rail movably mounted on the split electric control assembly frame on the other side of the fixed tight hoop, a lateral connection frame fixed on the split electric control assembly frame on the other side of the fixed tight hoop, an external adjustment support rod movably mounted on one side of the lateral connection frame, and an optical positioning module fixed at both ends of the fixed detection guide rail and the connection end of the flip detection guide rail.

[0016] The inner sides of the fixed detection guide rail and the flip detection guide rail are both provided with lateral tooth grooves that match the built-in electric control adjustment module.

[0017] The built-in electrically controlled adjustment module includes a first translation seat slidably assembled inside a fixed detection guide rail, a second translation seat slidably assembled inside a flip detection guide rail, an electrically controlled worm fixed inside the first translation seat and the second translation seat, a side worm wheel meshing with the electrically controlled worm, a side transmission gear coaxially fixed with the side worm wheel, and a transmission wheel group movably mounted on the outside of the first translation seat and the second translation seat.

[0018] The side walls of the first translation seat and the second translation seat are provided with internal thread assembly blind holes, and the optical detection probe is screwed into the internal thread assembly blind holes through an external thread connector and fixedly assembled with the first translation seat and the second translation seat.

[0019] The outer sides of the first assembly cover and the second assembly cover are provided with arc-shaped guide limiting grooves matching with the driving adjustment wheel.

[0020] The beneficial effects of the present invention are: (1) The flexible joint eccentricity tester of the present invention can better measure the eccentricity size of the cable within a 360-degree range, and will not cause the situation where the measured position is in a different direction; (2) The equipment is low-cost and easy to operate; (3) This equipment adopts a split structure design, using a height-adjustable electric control base to change the distance between the testers on both sides, so that it can adapt to cables of different lengths and has a wider range of applications; (4) By adopting optical positioning technology, it can be ensured that the testers on both sides can rotate synchronously, thereby controlling their synchronization and ensuring the accuracy of eccentricity detection; (5) The external electric control guide rail adopts a two-stage structural design, which can not only measure the outer sheath of the cable, but also measure the cross-section of the cable joint, greatly improving its measurement range and making the measurement data more diverse; (6) The entire test equipment adopts split assembly, which is convenient for loading and unloading, easy for replacement, and reduces the cost of later use; (7) The stability of the equipment can be greatly improved by lowering the center of gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the present invention under the test state.

[0023] Figure 2 It is a structural schematic diagram of the present invention.

[0024] Figure 3 It is a partial schematic diagram of the assembly end of the first translation seat in the present invention.

[0025] Figure 4 It is a partial schematic diagram of the second translation seat assembly end in the present invention.

[0026] Figure 5 It is a schematic diagram of the internal structure of the electric control base in the present invention.

[0027] Figure 6 It is an internal schematic diagram of the fixed clamp and the assembly end of the split electric control assembly frame in the present invention. DETAILED DESCRIPTION

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 A flexible joint eccentricity tester shown in the figure comprises a fixed clamp 1 for fixing on the left and right ends of a cable and an electric control base 2 matched with the fixed clamp 1, an electric control lifting rod 3 matched with the fixed clamp 1 is installed inside the electric control base 2, split electric control assembly frames 4 are movably mounted on both sides of the fixed clamp 1, an external electric control guide rail 6 is mounted on the outer side of the split electric control assembly frame 4, a built-in electric control adjustment module 7 is movably mounted on the inner side of the external electric control guide rail 6, and an optical detection probe 8 is fixedly mounted on the built-in electric control adjustment module 7.

[0031] Working principle: People first fix the two ends of the cable on the fixed clamps 1 on the top of the electric control base 2 on both sides, then the electric control base 2 is translated in opposite directions, and then the cable is straightened, and finally the split electric control assembly frame 4 drives the external electric control guide rail 6 to rotate 360° around the cable, and the built-in electric control adjustment module 7 is translated along the external electric control guide rail 6, and the optical detection probe 8 on it is used for optical detection, so as to scan and identify the outer and inner dimensions of the cable, so as to calculate the eccentricity of the cable. In order to improve the stability of the translation of the electric control base 2, a guide rail can be set on the ground to ensure that the electric control base 2 can be horizontally displaced along a straight line.

[0032] In order to cooperate with installation and fixation, the fixing clamp 1 includes a first assembly cover 11 and a second assembly cover 12 with first locking frames on both sides. The first assembly cover 11 and the second assembly cover 12 are fixedly assembled by bolts on the first locking frame.

[0033] The fixing clamp 1 is fixedly installed at the joint positions at both ends of the cable through the first assembly cover 11 and the second assembly cover 12.

[0034] In order to cooperate with the active assembly, the split electric control assembly frame 4 includes a third assembly cover 41 and a fourth assembly cover 42 with second locking frames on both sides, an arc-shaped transmission port opened inside the third assembly cover 41 and the fourth assembly cover 42, an outer mounting seat 43 fixed to the outside of the arc-shaped transmission port, and a driving adjustment wheel 44 movably assembled inside the arc-shaped transmission port. The third assembly cover 41 and the fourth assembly cover 42 are fixedly assembled by screws on the second locking frame.

[0035] The third assembly cover 41 and the fourth assembly cover 42 are movably assembled on the outer ends of both sides of the fixed clamp 1 by driving the adjustment wheel 44, and the adjustment wheel 44 is driven to rotate and adjust along the fixed clamp 1, thereby controlling the external electric control guide rail 6 to rotate 360° along the outer side of the cable.

[0036] In order to cooperate with the bottom translation control, the electric control base 2 includes a triangular assembly base 21, a bottom adjustment wheel 22 movably mounted at the lower end of the assembly base 21, and a battery 23 fixedly mounted inside the assembly base 21.

[0037] By fixing both ends of the cable inside the fixed clamp 1 at the top of the electric control lifting rod 3, and then using the bottom adjustment wheel 22 to translate to both sides, the assembly base 21 is driven to translate to both sides, thereby straightening the cable to ensure the accuracy of the detection data.

[0038] In order to cooperate with the lifting and lowering adjustment, an upper lifting groove 24 is opened on the upper surface of the assembly base 21. The electric lifting rod 3 includes an electric control screw rod 31 movably installed inside the upper lifting groove 24 and an internal lifting plate 32 threadedly engaged with the electric control screw rod 31. The internal lifting plate 32 is fixedly assembled with the second locking frame.

[0039] An internal thread control groove matched with the electric control screw 31 is provided on the outer side of the internal lifting plate 32 , and the internal lifting plate 32 is controlled to be raised and lowered in the upper lifting groove 24 by rotating the electric control screw 31 .

[0040] In order to cooperate with the external adjustment guide, the external electric control guide rail 6 includes a fixed detection guide rail 61 fixedly assembled on the split electric control assembly frame 4 on one side of the fixed tight hoop 1, a flip detection guide rail 62 movably mounted on the split electric control assembly frame 4 on the other side of the fixed tight hoop 1, a lateral connecting frame 63 fixed on the split electric control assembly frame 4 on the other side of the fixed tight hoop 1, an external adjustment support rod 64 movably mounted on one side of the lateral connecting frame 63, and an optical positioning module 65 fixed at both ends of the fixed detection guide rail 61 and the connecting end of the flip detection guide rail 62.

[0041] The external adjustment support rod 64 controls the angle adjustment of the flip detection guide rail 62 by telescoping, and can control the flip detection guide rail 62 to be parallel to the side of the cable connector, thereby facilitating optical detection of the internal structure of the cable connector.

[0042] The fixed detection rail 61 and the flip detection rail 62 are rotated and adjusted through the split electric control assembly frame 4 on both sides of the fixed clamp 1, and the fixed detection rail 61 and the matching flip detection rail 62 on both sides of the cable are positioned and synchronized through the optical positioning module 65.

[0043] In order to cooperate with the internal drive, the inner sides of the fixed detection guide rail 61 and the flip detection guide rail 62 are both provided with lateral tooth grooves 9 that cooperate with the built-in electric control adjustment module 7.

[0044] In order to cooperate with the electric control adjustment translation, the built-in electric control adjustment module 7 includes a first translation seat 71 slidably assembled inside the fixed detection guide rail 61, a second translation seat 72 slidably assembled inside the flip detection guide rail 62, an electric control worm 73 fixed inside the first translation seat 71 and the second translation seat 72, a side worm wheel 74 meshing with the electric control worm 73, a lateral transmission gear 75 coaxially fixed with the side worm wheel 74, and a transmission wheel group 76 movably mounted on the outside of the first translation seat 71 and the second translation seat 72.

[0045] The electrically controlled worm 73 synchronously drives the lateral worm wheel 74 by rotating, and then controls the rotation of the lateral transmission gear 75 through the lateral worm wheel 74, and then utilizes the lateral transmission gear 75 meshing with the lateral tooth groove 9 to drive the first translation seat 71 inside the fixed detection guide rail 61, and the second translation seat 72 to translate and adjust inside the flip detection guide rail 62, thereby changing the position, and the function of the transmission wheel group 76 is to improve the stability of the first translation seat 71 and the second translation seat 72 during movement.

[0046] In order to facilitate assembly and fixation, internal thread assembly blind holes are opened on the side walls of the first translation seat 71 and the second translation seat 72. The optical detection probe 8 is screwed into the internal thread assembly blind holes through an external thread connector and fixedly assembled with the first translation seat 71 and the second translation seat 72.

[0047] The optical detection probe 8 is passed around the outer periphery of the cable to detect the size of the cable, and then the size and position of the sheath and conductor in the cable cross section are detected to calculate the eccentricity of the entire cable.

[0048] In order to improve the adjustment guiding property and the lateral limiting capability, arc-shaped guiding limiting grooves 10 cooperating with the driving adjusting wheel 44 are provided on the outer sides of the first assembly cover 11 and the second assembly cover 12 .

[0049] The driving adjustment wheels 44 on the third assembly cover 41 and the fourth assembly cover 42 are inserted into the arc-shaped guide limiting groove 10 to be movably assembled with the first assembly cover 11 and the second assembly cover 12 .

[0050] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A flexible joint eccentricity tester, comprising a fixing clamp (1) for fixing on the left and right ends of a cable and an electric control base (2) matched with the fixing clamp (1), wherein: An electric control lifting rod (3) matched with the fixed clamp (1) is installed inside the electric control base (2); both sides of the fixed clamp (1) are movably equipped with a split electric control assembly frame (4); the outer side of the split electric control assembly frame (4) is equipped with an external electric control guide rail (6); the inner side of the external electric control guide rail (6) is movably equipped with a built-in electric control adjustment module (7); and the built-in electric control adjustment module (7) is fixedly equipped with an optical detection probe (8).

2. The flexible joint eccentricity tester according to claim 1, characterized in that: The fixing clamp (1) comprises a first assembly cover (11) and a second assembly cover (12) having first locking frames on both sides, and the first assembly cover (11) and the second assembly cover (12) are fixedly assembled by bolts on the first locking frame.

3. The flexible joint eccentricity tester according to claim 2, characterized in that: The split type electric control assembly frame (4) comprises a third assembly cover (41) and a fourth assembly cover (42) having second locking frames on both sides, an arc-shaped transmission opening provided inside the third assembly cover (41) and the fourth assembly cover (42), an outer mounting seat (43) fixed outside the arc-shaped transmission opening, and a driving adjustment wheel (44) movably mounted inside the arc-shaped transmission opening, wherein the third assembly cover (41) and the fourth assembly cover (42) are fixedly assembled by screws on the second locking frame.

4. The flexible joint eccentricity tester according to claim 3 is characterized in that: The electric control base (2) comprises an assembly base (21) of a triangular structure, a bottom-mounted adjustment wheel (22) movably mounted at the lower end of the assembly base (21), and a storage battery (23) fixedly mounted inside the assembly base (21).

5. The flexible joint eccentricity tester according to claim 4 is characterized in that: An upper lifting groove (24) is formed on the upper surface of the assembly base (21); the electric-controlled lifting rod (3) comprises an electric-controlled lead screw (31) movably mounted inside the upper lifting groove (24) and an internal lifting plate (32) threadedly engaged with the electric-controlled lead screw (31); the internal lifting plate (32) is fixedly assembled with the second locking frame.

6. The flexible joint eccentricity tester according to claim 3 is characterized by: The external electric control guide rail (6) comprises a fixed detection guide rail (61) fixedly mounted on a split electric control assembly frame (4) on one side of the fixed clamp (1), a flip detection guide rail (62) movably mounted on the split electric control assembly frame (4) on the other side of the fixed clamp (1), a lateral connection frame (63) fixed on the split electric control assembly frame (4) on the other side of the fixed clamp (1), an external adjustment support rod (64) movably mounted on one side of the lateral connection frame (63), and an optical positioning module (65) fixed at both ends of the fixed detection guide rail (61) and at the connection end of the flip detection guide rail (62).

7. The flexible joint eccentricity tester according to claim 6 is characterized by: The inner sides of the fixed detection guide rail (61) and the flip detection guide rail (62) are both provided with lateral tooth grooves (9) that match the built-in electric control adjustment module (7).

8. The flexible joint eccentricity tester according to claim 6, characterized in that: The built-in electric control adjustment module (7) comprises a first translation seat (71) slidably mounted inside a fixed detection guide rail (61), a second translation seat (72) slidably mounted inside a flip detection guide rail (62), an electric control worm (73) fixed inside the first translation seat (71) and the second translation seat (72), a side worm wheel (74) meshing with the electric control worm (73), a side transmission gear (75) coaxially fixed with the side worm wheel (74), and a transmission wheel group (76) movably mounted on the outside of the first translation seat (71) and the second translation seat (72).

9. The flexible joint eccentricity tester according to claim 8, characterized in that: Internal thread assembly blind holes are provided on the side walls of the first translation seat (71) and the second translation seat (72), and the optical detection probe (8) is screwed into the internal thread assembly blind holes through an external thread connector to be fixedly assembled with the first translation seat (71) and the second translation seat (72).

10. The flexible joint eccentricity tester according to claim 3, characterized in that: Arc-shaped guide limit grooves (10) matching with the driving adjustment wheel (44) are provided on the outer sides of the first assembly cover (11) and the second assembly cover (12).

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