Measuring device suitable for measuring cable insulation sheath

Abstract

The invention relates to the technical field of measuring equipment, and discloses a measuring device suitable for measuring a cable insulation sheath, which comprises a sheath clamp, an outer wall measuring rod, an inner wall measuring rod, a support body, a measuring scale, an electronic measurer and a driving device, the sheath clamp is used for clamping a sheath to be measured, one end of the outer wall measuring rod is used for contacting with the outer wall of the sheath to be measured, and the other end of the outer wall measuring rod is used for contacting with the inner wall of the sheath to be measured. One end of the inner wall measuring rod is connected with the outer wall measuring rod, the other end of the inner wall measuring rod is connected with the electronic measurer, the electronic measurer is movably installed on the measuring ruler, the inner wall measuring rod corresponds to the outer wall measuring rod, the inner wall measuring rod is used for making contact with the inner wall of a sheath to be measured, the inner wall measuring rod and the supporting body are connected with the measuring ruler, and the supporting body is used for being inserted into the sheath to be measured and supporting the inner wall of the sheath to be measured. The driving device is connected with the measuring scale. A rotary measurement method is adopted, the thickness of the rubber layer of the insulating sheath can be comprehensively measured, the minimum value is automatically output, and it is guaranteed that the electrical insulation performance of the insulating sheath meets the requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring equipment, and in particular to a measuring device suitable for measuring an insulating sheath of a cable. Background Art

[0002] Due to factors such as wind, bird movement, and tree branches, the reduced spacing between high-voltage cables can degrade air insulation and cause phase-to-phase discharges. If the spacing is further reduced, or even if the cables come into direct contact, a short circuit can occur, seriously impacting power transmission safety. Therefore, high-voltage cables are typically covered with an insulating sheath.

[0003] The dimensions of insulating sheaths directly affect their electrical insulation properties. Therefore, dimensional measurements must be performed before they are put into use to prevent inferior insulating sheaths with uneven thickness and low inner diameters from being put into use, which could affect safety. Currently, the thickness and inner diameter of the insulating sheath are measured by clamping the rubber layer of the insulating sheath and supporting the inner wall with the measuring arm of a vernier ruler. This measurement method has the following problems: 1) The thickness of the rubber layer of some poor-quality insulation sheaths may be uneven. The clamping method may miss the thinnest point when measuring the thickness. The electrical insulation performance of the insulation sheath is mainly determined by the thinnest point, so the measurement results cannot accurately evaluate its electrical insulation performance. 2) The insulating sheath is made of soft material. Its cross-section will change from circular to elliptical when supported. Especially when the measuring arm of the vernier ruler supports the inner wall with too much force, the measurement result will be significantly higher than the diameter in its original state, resulting in misjudgment of the inner diameter of the cylinder. Summary of the Invention

[0004] In view of the existing technical problems, the present invention provides a measuring device suitable for measuring the insulation sheath of a cable.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A measuring device suitable for measuring the insulating sheath of a cable, comprising a sheath clamp, which is used to clamp the sheath to be measured, and also comprising an outer wall measuring rod, an inner wall measuring rod, a support body, a measuring ruler, an electronic measuring device and a driving device, wherein one end of the outer wall measuring rod contacts the outer wall of the sheath to be measured, and the other end is connected to the electronic measuring device, and the electronic measuring device is movably mounted on the measuring ruler, the inner wall measuring rod corresponds to the outer wall measuring rod, and the inner wall measuring rod is used to contact the inner wall of the sheath to be measured, the inner wall measuring rod and the support body are respectively connected to the measuring ruler, the support body is used to be inserted into the sheath to be measured and support the inner wall of the sheath to be measured, and the driving device is connected to the measuring ruler.

[0006] On the basis of the above technical solution, the present invention can also make the following improvements: Preferably, the driving device includes a fifth connecting rod, a support sleeve and a push rod, the support sleeve is installed on the fifth connecting rod, a accommodating cavity is provided in the support sleeve, a disk is provided in the accommodating cavity, one end of the disk is connected to the push rod, and the other end is connected to the measuring ruler.

[0007] Preferably, it further comprises a second elastic telescopic shaft and a blocking rod, one end of the second elastic telescopic shaft is connected to the outer wall measuring rod, and the other end is connected to the blocking rod, and the blocking rod is installed at the upper end of the measuring ruler.

[0008] Preferably, the outer wall measuring rod is connected to the electronic measuring device through a thickness measuring arm.

[0009] Preferably, the inner wall measuring rod is connected to the measuring ruler via a zero point blocking rod, and the zero point blocking rod is installed at the zero point of the measuring ruler.

[0010] Preferably, it also includes a third connecting rod and a wire take-up device, the wire take-up device is installed on the third connecting rod, the third connecting rod is connected to the measuring ruler, the wire take-up device is provided with a snap switch and a traction line, the other end of the traction line is connected to the inner wall measuring rod, and the inner wall measuring rod is rotatably installed on the zero point blocking rod.

[0011] Preferably, the wire take-up device is connected to an inner diameter measuring arm, and the inner diameter measuring arm cooperates with the electronic measuring device to measure the length of the traction wire.

[0012] Preferably, the support body is in a cone shape.

[0013] Preferably, the support body includes two matched support surfaces, the support surfaces are semi-conical, a spring rod is provided between the two support surfaces, and the spring rod is connected to the measuring ruler through a fourth connecting rod.

[0014] Preferably, it also includes a first connecting rod, a slide cylinder and a second connecting rod, one end of the first connecting rod is connected to the sheath clamp, and the other end is connected to the slide cylinder, the second connecting rod is movably inserted in the slide cylinder, and the other end of the second connecting rod is connected to the driving device.

[0015] The beneficial effects of the present invention are as follows: the inner wall of the insulating sheath is supported by a support body to prevent the insulating sheath from being deformed by pressure, thereby improving measurement accuracy; the thickness of the rubber layer of the insulating sheath is comprehensively measured by a rotational measurement method, and the minimum value is automatically output, which is of great significance for evaluating the electrical insulation performance of the insulating sheath and ensuring that the electrical insulation performance of the insulating sheath meets the requirements. The inner wall measuring rod is rotated around the inner wall of the sheath to be measured, and the inner diameter of the cylinder is calculated by measuring the circumference of the inner cross-section of the cylinder by the change in the length of the traction line during the measurement. The entire measurement process is simple and fast, and the measurement results are accurate and reliable. The measurement data is recorded by an electronic measuring device to improve measurement efficiency and measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of measuring the wall thickness of a sheath to be measured according to the present invention; Figure 3 A schematic diagram of a push rod of a support sleeve according to the present invention; Figure 4 Schematic diagram of the support body of the present invention.

[0017] The accompanying drawings are marked as follows: 1. Sheath clamp; 2. First connecting rod; 3. Slide; 4. Second connecting rod; 5. Third connecting rod; 6. Wire take-up; 7. Snap switch; 8. Blocking plate; 9. Pull line; 10. Outer wall measuring rod; 11. Inner wall measuring rod; 12. Support body; 121. Support surface; 122. Spring rod; 13. Fourth connecting rod; 14. Zero point blocking rod; 15. First elastic telescopic shaft; 16. Thickness measuring arm; 17. Second elastic telescopic shaft; 18. Blocking rod; 19. Measuring ruler; 20. Inner diameter measuring arm; 21. Electronic measuring device; 211. Display screen; 212. Power switch; 213. Thickness measuring key; 214. Inner diameter measuring key; 22. Fifth connecting rod; 23. Support sleeve; 24. Push rod; 241. Disk; 25. Sheath to be measured. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first," "second," and so forth in the specification and claims of the present invention, as well as in the accompanying drawings, are used to distinguish similar objects and are not necessarily intended to describe a specific order or sequence. Terms such as "vertical," "upper," "lower," and "horizontal" indicate positions or relationships based on those shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0020] like Figures 1 to 4 As shown, the present invention discloses a measuring device suitable for measuring the insulation sheath of a cable, comprising a sheath clamp 1, the sheath clamp 1 is used to clamp the sheath 25 to be measured, the sheath 25 to be measured is a cable insulation sheath, the outer wall of the sheath clamp 1 is provided with a handle to improve the convenience of operation, and further comprises an outer wall measuring rod 10, an inner wall measuring rod 11, a support body 12, a measuring ruler 19, an electronic measuring device 21 and a driving device, one end of the outer wall measuring rod 10 is used to contact the outer wall of the sheath 25 to be measured, and the other end is connected to the electronic measuring device 21, and the electronic measuring device 21 is movably mounted on the measuring ruler 19, the inner wall measuring rod 11 corresponds to the outer wall measuring rod 10. The inner wall measuring rod 11 is used to contact the inner wall of the sheath 25 to be measured. Furthermore, the axes of the inner wall measuring rod 11 and the outer wall measuring rod 10 are parallel to the axis of the sheath 25 to be measured, so that they are in full contact with the sheath 25 to be measured, ensuring the flatness of the side wall of the sheath 25 to be measured and improving the accuracy of the measurement. The inner wall measuring rod 11 and the support body 12 are respectively connected to the measuring ruler 19. The support body 12 is used to be inserted into the sheath 25 to be measured and support the inner wall of the sheath 25 to be measured. The driving device is connected to the measuring ruler 19. Using the support body 12 to support the sheath 25 to be measured can maintain the stability of the sheath 25 to be measured during the measurement process, prevent it from being deformed by external forces, and thus ensure the accuracy of the measurement results. In addition, by driving the measuring ruler 19 to move through the driving device, the outer wall measuring rod 10 and the inner wall measuring rod 11 can be driven to move along the outer wall and inner wall of the sheath 25 to be measured, respectively, so as to measure the wall thickness of the sheath 25 to be measured, and the measurement results are recorded by the electronic measuring device 21, thereby achieving a comprehensive detection of the wall thickness of the sheath 25 to be measured and improving the accuracy of the measurement results.

[0021] The electronic measuring instrument 21 is equipped with a display screen 211, an on / off key 212, a thickness measurement key 213, and an inner diameter measurement key 214 to enhance operational convenience. The display screen 211 displays measurement data for easy reading and recording. The on / off key 212 controls the on / off state of the electronic measuring instrument 21. The thickness measurement key 213 activates the thickness measurement mode, and the inner diameter measurement key 214 activates the inner diameter measurement mode. By selecting different measurement modes, different measurement requirements can be met, enhancing measurement flexibility and practicality.

[0022] In this embodiment, the drive device specifically includes a fifth connecting rod 22, a support sleeve 23, and a push rod 24. The support sleeve 23 is mounted on the fifth connecting rod 22. A receiving cavity is defined within the support sleeve 23, within which a disc 241 is located. One end of the disc 241 is connected to the push rod 24, and the other end is connected to the measuring ruler 19. When the push rod 24 is manually operated, the disc 241 can move smoothly along the receiving cavity of the support sleeve 23, thereby driving the outer wall measuring rod 10 and the inner wall measuring rod 11 to move circumferentially along the sheath 25 to be measured via the measuring ruler 19. This allows the outer wall measuring rod 10 and the inner wall measuring rod 11 to fully contact the sheath 25 to accurately measure the wall thickness of the sheath 25. The provision of the disc 241 ensures that the push rod 24 remains stable during movement, preventing shaking and improving measurement accuracy.

[0023] In this embodiment, specifically, the outer wall measuring rod 10 is connected to the electronic measuring device 21 through the thickness measuring arm 16, and the thickness measuring arm 16 is installed at the bottom of the electronic measuring device 21, so that the outer wall measuring rod 10 can stably transmit the measurement data to the electronic measuring device 21 during the movement, thereby ensuring the accuracy of the measurement data.

[0024] The measuring device for measuring cable insulation sheaths also includes a second elastically retractable shaft 17 and a blocking rod 18. One end of the second elastically retractable shaft 17 is connected to the upper end of the outer wall measuring rod 10, and the other end is connected to the blocking rod 18. The blocking rod 18 is mounted on the upper end of the measuring ruler 19. The second elastically retractable shaft 17 enables the outer wall measuring rod 10 to contact the outer wall of the sheath 25 to be measured, better adapting to the irregular shape of the outer wall of the sheath 25 to be measured during the measurement process, further improving the accuracy and reliability of the measurement.

[0025] Furthermore, the inner wall measuring rod 11 is connected to the measuring scale 19 via a zero-point stopper 14, which is mounted at the zero point of the measuring scale 19. Constrained by the zero-point stopper 14, the inner wall measuring rod 11 ensures that the relative position of the inner wall measuring rod 11 and the measuring scale 19 is accurate when measuring the initial position, thus avoiding measurement errors.

[0026] The measuring device suitable for measuring the insulation sheath of a cable also includes a third connecting rod 5 and a wire take-up device 6. The wire take-up device 6 is mounted on the third connecting rod 5, which is connected to a measuring ruler 19 via a blocking rod 18. The wire take-up device 6 is provided with a snap switch 7 and a traction wire 9. The other end of the traction wire 9 is connected to an inner wall measuring rod 11, which is rotatably mounted on a zero-point blocking rod 14. Furthermore, an inner diameter measuring arm 20 is connected to the wire take-up device 6. The inner diameter measuring arm 20 cooperates with an electronic measuring device 21 to measure the length of the traction wire 9. When measuring the inner diameter of the sheath 25 to be measured, the traction line 9 is released through the wire take-up device 6, the inner diameter measuring arm 20 contacts the electronic measuring device 21, and the inner diameter measurement key 214 is clicked. At this time, 0 is displayed on the display screen 211. The inner wall measuring rod 11 is driven to rotate along the inner wall of the sheath 25 to be measured for one circle by operating the push rod 24. At the same time, the inner wall measuring rod 11 rotates around its own axis, so that the traction line 9 is wrapped around the inner wall measuring rod 11. After the inner wall measuring rod 11 rotates around the sheath 25 to be measured, the electronic measuring device 21 and the inner diameter measuring arm 20 are manually pushed upward, and the traction line 9 is continuously released until the traction line 9 is straightened. At this time, the moving distance of the inner diameter measuring arm 20 is the circumference of the inner cross-section of the sheath 25 to be measured. The electronic measuring device 21 automatically calculates and displays the inner diameter of the sheath 25 to be measured on the display screen 211. The entire measurement process does not require manual operation of the measuring arm, which simplifies the measurement steps and improves the measurement efficiency. At the same time, since the inner wall measuring rod 11 is always in contact with the inner wall of the sheath 25 to be measured during the measurement process, the circumference of the inner cross section of the cylinder can be accurately measured, thereby ensuring the accuracy of the measurement result.

[0027] In this embodiment, the support body 12 is conical in shape. The conical support body 12 can better adapt to the inner wall shape of the sheath 25 to be measured, provide stable support force, prevent deformation of the sheath 25 to be measured, ensure the accuracy of the measurement results, and facilitate insertion and removal, thereby improving the convenience of measurement.

[0028] Furthermore, the support body 12 includes two mating support surfaces 121, each of which is semi-conical in shape. A spring rod 122 is provided between the two support surfaces 121, and the spring rod 122 is connected to the measuring ruler 19 via a fourth connecting rod 13. Specifically, the support body 12 is mounted on the fourth connecting rod 13, which is connected to the first elastic telescopic shaft 15 at the bottom of the measuring ruler 19. The fourth connecting rod 13 and the first elastic telescopic shaft 15 are L-shaped as a whole. The spring rod 122 acts as a spring. Under normal conditions, the distance between the two support surfaces 121 is relatively large. When the support body 12 is inserted into the sheath 25 to be measured, the two support surfaces 121 are squeezed to reduce the distance between them. The sheath 25 to be measured is expanded into a circular shape by the cooperation of the two semi-conical support surfaces 121, thereby more accurately measuring the wall thickness and inner diameter of the sheath 25 to be measured. At the same time, the setting of the spring rod 122 allows the support body 12 to have a certain degree of elasticity when inserting and removing the sheath 25 to be measured, which can better adapt to sheaths 25 of different sizes to be measured, thereby improving the versatility and flexibility of the measurement. Furthermore, the spring rod 122 can also play a buffering role, avoiding damage to the sheath 25 to be measured during the measurement process, and protecting the integrity of the sheath 25 to be measured. Due to the different diameters of different sheaths 25 to be measured, the distance between the inner wall measuring rod 11 and the support body 12 and the fourth connecting rod 13 is also different. By installing the first elastic telescopic shaft 15, the vertical distance between the inner wall measuring rod 11 and the support body 12 and the fourth connecting rod 13 can be adjusted to meet the measurement requirements of sheaths 25 of different diameters to be measured, improve flexibility and convenience during use, and ensure that the inner wall measuring rod 11 can be in close contact with the inner wall of the sheath 25 to be measured, further improving the accuracy of the measurement.

[0029] Furthermore, a blocking plate 8 is installed on the third connecting rod 5, and the blocking plate 8 is located below the wire take-up 6. The blocking plate 8 is used to limit the position of the wire take-up 6 to prevent the wire take-up 6 from moving downward during the extension of the traction line 9. In addition, the blocking plate 8 limits the position of the wire take-up 6 and the inner diameter measuring arm 20 to the initial position for measuring the inner diameter of the sheath 25 to be measured, thereby ensuring the accuracy of the measurement results.

[0030] The measuring device suitable for measuring the insulation sheath of a cable also includes a first connecting rod 2, a slide 3, and a second connecting rod 4. One end of the first connecting rod 2 is connected to the sheath clamp 1, and the other end is connected to the slide 3. The second connecting rod 4 is movably inserted into the slide 3, and the other end of the second connecting rod 4 is connected to the driving device. Specifically, the second connecting rod 4 is connected to the support sleeve 23 through the fifth connecting rod 22. Through the coordinated arrangement of the first connecting rod 2, the slide 3, and the second connecting rod 4, the second connecting rod 4 can move smoothly along the slide 3, thereby driving the measuring ruler 19, the support body 12, the outer wall measuring rod 10, and the inner wall measuring rod 11 to move smoothly toward the sheath to be measured 25, thereby measuring the sheath to be measured 25. The arrangement of the slide 3 can also play a guiding role, so that the second connecting rod 4 can remain stable during movement, avoid shaking, and further improve the accuracy of the measurement.

[0031] The working process of the present invention is as follows: Measure the wall thickness of the sheath 25 to be tested: 1) Clamp the sheath 25 to be measured with the sheath clamp 1, manually push the support sleeve 23 to move, so that the support body 12 is fully extended into the cylinder of the sheath 25 to be measured, and manually move the outer wall measuring rod 10 upward. Then, continue to push the support sleeve 23, so that it drives the outer wall measuring rod 10 and the inner wall measuring rod 11 to move toward the sheath 25 to be measured, so that the outer wall measuring rod 10 and the inner wall measuring rod 11 clamp the side wall of the sheath 25 to be measured; 2) Turn on the power button 212 of the electronic measuring device 21, click the thickness measurement button 213, and open the snap switch 7 of the wire take-up device 6. At this time, the wire take-up device 6 can release the pulling line 9; 3) Manually operate the push rod 24 to move clockwise or counterclockwise, so that the outer wall measuring rod 10 and the inner wall measuring rod 11 move circumferentially along the sheath to be measured 25. At the same time, under the action of the friction between the inner wall measuring rod 11 and the inner wall of the sheath to be measured 25, the inner wall measuring rod 11 rotates around its own axis, so that the traction line 9 is wrapped around the inner wall measuring rod 11. During the movement, the second elastic telescopic shaft 17 continuously squeezes the outer wall measuring rod 10 against the outer surface of the rubber layer of the sheath to be measured 25. During the process of rotating around the sheath to be measured 25 once, the distance between the outer wall measuring rod 10 and the inner wall measuring rod 11 changes with the thickness of the rubber layer. The electronic measuring device 21 continuously measures the thickness of the sheath to be measured 25, and displays the minimum thickness value in the current measurement process by comparison. The value displayed on the display screen 211 is the minimum thickness value of the sheath to be measured 25, ensuring comprehensive detection of the sheath to be measured 25, ensuring the accuracy of the measurement results, ensuring that the wall thickness of the sheath to be measured 25 meets the requirements, avoiding defective products from being put on the market, and ensuring safety of use.

[0032] Measure the inner diameter of the sheath 25 to be tested: 1) Close the snap switch 7 of the wire take-up device 6. The wire take-up device 6 no longer releases the traction wire 9. The contraction force of the snap switch 7 on the traction wire 9 is less than the force required to rotate the inner wall measuring rod 11, so that the traction wire 9 is straightened. Place the electronic measuring device 21 against the inner diameter measuring arm 20 and click the inner diameter measurement button 214 on the electronic measuring device 21. At this time, the display value on the display screen 211 is 0. 3) Manually push the electronic measuring device 21 upward to move the inner diameter measuring arm 20 upward, and at the same time drive the inner wall measuring rod 11 to rotate in the opposite direction, continuously releasing the traction line 9 wrapped around the inner wall measuring rod 11 until all the traction lines 9 are released. At this time, the movement distance of the inner diameter measuring arm 20 is the circumference of the inner cross section of the sheath 25 to be measured. The electronic measuring device 21 automatically calculates and displays the inner diameter value of the sheath 25 to be measured according to the formula: diameter = circumference / π, thereby accurately measuring the inner diameter of the sheath 25 to be measured.

[0033] The present invention enables comprehensive and accurate measurement of the wall thickness and inner diameter of the sheath 25 to be measured. The support body 12 not only provides stable support, preventing deformation of the sheath 25 to be measured during measurement, but also, through its conical design, better adapts to the inner wall shape of the sheath 25 to be measured, improving measurement accuracy and convenience. The display screen 211 of the electronic measuring device 21 displays measurement data in real time, allowing the user to intuitively obtain measurement results. Furthermore, different measurement modes are available to meet diverse measurement needs, enhancing measurement flexibility and practicality.

[0034] By manually operating the push rod 24, the outer wall measuring rod 10 and the inner wall measuring rod 11 can be driven to move circumferentially along the sheath 25 to be measured, achieving comprehensive measurement with simple and reliable operation. The measuring device of the present invention has the advantages of accurate measurement and simple operation, and can be widely used in the field of measuring cable insulation sheaths, providing strong technical support for the detection of cable insulation performance.

[0035] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A measuring device for measuring a cable insulation sheath, comprising a sheath clamp (1), wherein the sheath clamp (1) is used to clamp a sheath to be measured (25), and is characterized in that: The invention also includes an outer wall measuring rod (10), an inner wall measuring rod (11), a support body (12), a measuring ruler (19), an electronic measuring device (21) and a driving device, wherein one end of the outer wall measuring rod (10) contacts the outer wall of the jacket (25) to be measured, and the other end is connected to the electronic measuring device (21), and the electronic measuring device (21) is movably mounted on the measuring ruler (19), the inner wall measuring rod (11) corresponds to the outer wall measuring rod (10), the inner wall measuring rod (11) is used to contact the inner wall of the jacket (25) to be measured, the inner wall measuring rod (11) and the support body (12) are respectively connected to the measuring ruler (19), the support body (12) is used to be inserted into the jacket (25) to be measured and support the inner wall of the jacket (25) to be measured, and the driving device is connected to the measuring ruler (19).

2. The measuring device for measuring cable insulation sheath according to claim 1, characterized in that: The driving device comprises a fifth connecting rod (22), a supporting sleeve (23) and a pushing rod (24); the supporting sleeve (23) is mounted on the fifth connecting rod (22); a receiving cavity is provided in the supporting sleeve (23); a disc (241) is provided in the receiving cavity; one end of the disc (241) is connected to the pushing rod (24), and the other end is connected to the measuring ruler (19).

3. The measuring device for measuring cable insulation sheath according to claim 1 or 2, characterized in that: It also includes a second elastic telescopic shaft (17) and a blocking rod (18), one end of the second elastic telescopic shaft (17) is connected to the outer wall measuring rod (10), and the other end is connected to the blocking rod (18), and the blocking rod (18) is installed on the upper end of the measuring ruler (19).

4. The measuring device for measuring cable insulation sheath according to claim 3, characterized in that: The outer wall measuring rod (10) is connected to the electronic measuring device (21) via a thickness measuring arm (16).

5. The measuring device for measuring cable insulation sheath according to claim 1 or 2, characterized in that: The inner wall measuring rod (11) is connected to the measuring ruler (19) via a zero point blocking rod (14), and the zero point blocking rod (14) is installed at the zero point of the measuring ruler (19).

6. The measuring device for measuring cable insulation sheath according to claim 5, characterized in that: The invention also includes a third connecting rod (5) and a wire take-up device (6), wherein the wire take-up device (6) is mounted on the third connecting rod (5), the third connecting rod (5) is connected to the measuring ruler (19), the wire take-up device (6) is provided with a snap switch (7) and a traction line (9), the other end of the traction line (9) is connected to the inner wall measuring rod (11), and the inner wall measuring rod (11) is rotatably mounted on the zero point blocking rod (14).

7. The measuring device for measuring cable insulation sheath according to claim 6, characterized in that: The wire take-up device (6) is connected to an inner diameter measuring arm (20), and the inner diameter measuring arm (20) cooperates with the electronic measuring device (21) to measure the length of the traction wire (9).

8. The measuring device for measuring cable insulation sheath according to claim 1 or 2, characterized in that: The support body (12) is in the shape of a cone.

9. The measuring device for measuring cable insulation sheath according to claim 8, characterized in that: The support body (12) comprises two matched support surfaces (121), the support surfaces (121) are semi-conical, a spring rod (122) is provided between the two support surfaces (121), and the spring rod (122) is connected to the measuring ruler (19) via a fourth connecting rod (13).

10. The measuring device for measuring cable insulation sheath according to claim 1 or 2, characterized in that: It also includes a first connecting rod (2), a slide cylinder (3) and a second connecting rod (4), one end of the first connecting rod (2) is connected to the sheath clamp (1), and the other end is connected to the slide cylinder (3), the second connecting rod (4) is movably inserted in the slide cylinder (3), and the other end of the second connecting rod (4) is connected to the driving device.

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