Thickness detection device for cable insulation layer and detection method thereof

Abstract

The invention relates to the technical field of insulation layer measurement, and discloses a thickness detection device for a cable insulation layer and a detection method thereof.The thickness detection device comprises a base, a first fixing block is fixedly connected to one side of the top end of the base, and a second fixing block is fixedly connected to one side, close to the middle, of the first fixing block, of the base; a stretching block is installed on the side, away from the first fixing block, of the second fixing block on the base, a cable is placed on the first fixing block, the second fixing block and the stretching block, the exposed wire part of the cable is located at the stretching block, and one side of the first fixing block is connected with a first fixing auxiliary block through a hinge. By adopting the combination of the main ruler and the auxiliary ruler, 0.02 mm-level high-precision measurement is realized, the industrial standard requirement is met, the puncture needle and the main rod are synchronously positioned through the abutting block, zero scale alignment is realized in an initial state, the consistency of measurement references is ensured, manual operation errors are reduced, carrying is convenient, and measurement can be carried out at any time.

Description

Technical Field

[0001] The present invention relates to the technical field of insulation layer measurement, and more specifically to a thickness detection device and a detection method for a cable insulation layer. Background Art

[0002] The existing cable insulation thickness detection device mainly slices the cable to be tested, extracts the wires therein, or cuts and takes out the wires, and then measures the insulation layer. The imaging method and other equipment are required for measurement to obtain the thickness of the cable insulation layer. There is also a method of measuring after slicing.

[0003] The existing equipment is inconvenient to carry and has complex operation when measuring thickness. In addition, destructive testing is used during detection, and it is necessary to ensure that the detected wire is flush when cut. Therefore, the present invention provides a cable insulation thickness detection device and a detection method thereof. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a device for detecting the thickness of a cable insulation layer and a detection method thereof, so as to solve the problems existing in the above-mentioned background technology.

[0005] The present invention provides the following technical solution: a device for detecting the thickness of an insulating layer of a cable and a detection method thereof, comprising a base, a first fixed block being fixedly connected to one side of the top end of the base, a second fixed block being fixedly connected to one side of the base located near the middle of the first fixed block, a stretching block being installed on one side of the base located away from the first fixed block, a cable being placed on the first fixed block, the second fixed block and the stretching block, a bare conductor portion of the cable being located at the stretching block, a first fixed auxiliary block being connected to one side of the first fixed auxiliary block by a hinge, a first fixed top block being fixedly connected to the top of the first fixed auxiliary block, a stretching auxiliary block being connected to one side of the stretching block by a hinge, a second fixed auxiliary block being connected to one side of the second fixed block by a hinge, a second fixed top block being fixedly connected to the top of the second fixed auxiliary block, a middle portion of the second fixed top block and a middle portion of the second fixed block being at the same projection position, and a measuring block being fixedly connected to the top of the second fixed auxiliary block located away from the second fixed top block.

[0006] Furthermore, a main groove is provided on one side of the middle part of the measuring block, and a secondary groove is provided on the other side of the measuring block, the main groove is movably connected with a main rod, and a puncture needle is movably connected in the secondary groove, the measuring block is provided with a secondary slot in the middle of the secondary slot, return slots are provided on both sides of the secondary slot of the measuring block, and the return slot is provided with a turning groove on the side away from the secondary slot, a puncture thread is provided on the side of the middle end of the puncture needle close to the bottom end, the maximum diameter of the puncture thread is larger than the diameter of the puncture needle, the secondary groove is movably connected with the puncture thread on the puncture needle, and the puncture Clamping blocks are installed on both sides of the puncture thread of the needle at the auxiliary slot, and a half-thread groove is opened in the middle of one side of the puncture thread of the clamping block. The half-thread grooves of the two clamping blocks are combined and threadedly connected to the puncture thread of the puncture needle, and the clamping block is fixedly connected to the puncture auxiliary block on the side close to the return slot, and the clamping block is movably connected to the return slot through the puncture auxiliary block, and the outer wall of the puncture auxiliary block is movably sleeved with a return clamping spring, one end of the return clamping spring is fixedly connected to the clamping part of the puncture auxiliary block, and the other end is fixedly connected to the bottom of the groove on the side of the return slot close to the clamping block.

[0007] Furthermore, the two return clamping springs both control the puncture sub-block to move in the direction of the puncture thread, the puncture needle is located on the side of the return slot away from the sub-slot and is provided with a steering groove, and a steering wheel is installed in the steering groove, a clamping rod is movably connected to one side of the top of the measuring block, and a positioning block is fixedly connected to the bottom end of the clamping rod, and the measuring block is located at the bottom end of the positioning block and is provided with a slot, when the clamping rod presses the knob, the positioning block will be stuck in the slot at the bottom, and when the clamping rod lifts the knob, the positioning block will be separated from the slot at the bottom and can rotate freely, and the two The outer wall of the steering wheel is provided with a tensioning rope, one end of the two tensioning ropes is fixedly connected to the middle part of one side of the nearest puncture sub-block, and the other end of the two tensioning ropes is fixedly connected to one side of the upper part of the positioning block of the clamping rod. When the clamping rod rotates, the tensioning rope will transmit the tension through the steering wheel to pull the clamping block to move in the direction of the steering wheel; the puncture needle is movably sleeved with equidistantly arranged ring sleeves at the top of the measuring block, and the equidistantly arranged ring sleeves are fixedly connected to the sub-ruler, the top of the puncture needle is fixedly connected to the puncture knob, and the bottom end of the main slot is provided with a main slot.

[0008] Furthermore, a main clamping block is fixedly connected to the outer wall of the bottom end of the main rod and located in the main clamping slot, a main ruler is fixedly connected to the top end of the main rod and located on the outer wall of the measuring block, and a stop block is fixedly connected to the bottom end of the main rod and located at the second fixed auxiliary block. In the initial state, after the secondary ruler is rotated at the same height, they are located on the same horizontal line as the main ruler, and the zero scale line is aligned. At this time, the middle part of the bottom end of the stop block is at the same horizontal height as the needle tip of the puncture needle.

[0009] Furthermore, the second fixed top block is provided with a return groove in the middle of the second clamping slot, and the second fixed top block is provided with an extrusion groove at the bottom end of the return groove. The internal structures of the first fixed top block and the second fixed top block are the same, that is, both are provided with a return groove and an extrusion groove, the top end of the first fixed block is provided with a first clamping slot, the top end of the second fixed block is provided with a second clamping slot, and the second clamping slot is provided with a first claw groove, and the second clamping slot is fixedly connected with a clamping slot pad, and the clamping slot pad is fitted with the second clamping slot, and a pressing component is movably clamped in the return groove, and the pressing component includes a claw block, the top end of the claw block is fixedly connected with a clamping rod, the outer wall of the clamping rod is movably sleeved with a first return spring, the bottom end of the claw block is fixedly connected with the first claw pad, and the clamping rod is movably sleeved with the return groove The cam is engaged with the first and second movable jaws and the movable jaws are connected with the first movable jaws, and the movable jaws are connected with the first movable jaws.

[0010] Furthermore, the top of the first fixing auxiliary block is located at the other side of the hinge and is fixedly connected to the first fixing side block, and the second fixing auxiliary block is located at the other side of the hinge and is fixedly connected to the second fixing side block, the middle of the first fixing side block is movably clamped with the first fixing screw, and the middle of the second fixing side block is movably clamped with the second fixing screw, the first fixing screw has a first fixing thread at the bottom end, and the second fixing thread has a second fixing thread at the bottom end of the second fixing screw, the top of the base and the bottom end of the second fixing screw have a first fixing groove, and the base has a second fixing groove at the bottom end of the second fixing thread, the first fixing auxiliary block is threadedly connected to the top of the first fixing block through the hinge and the first fixing thread at the bottom end of the first fixing screw of the first fixing side block and the first fixing groove, and the second fixing auxiliary block is threadedly connected to the top of the second fixing block through the hinge and the second fixing thread at the bottom end of the second fixing screw of the second fixing side block and the second fixing groove.

[0011] Furthermore, a stretching return groove is provided in the middle of the stretching auxiliary block, a stretching pressure groove is provided at the bottom end of the stretching return groove, a stretching rod is installed in the stretching return groove, the stretching rod is movably clamped with the stretching return groove, a second return spring is movably sleeved on the outer wall of the stretching rod, the bottom end of the stretching rod is fixedly connected to the top of the second return spring, the bottom end of the second return spring is fixedly connected to the bottom end of the stretching return groove, a stretching groove is provided at the top of the stretching block, a second claw groove is provided in the stretching groove, a second claw pad is installed in the stretching groove, a stretching claw is fixedly connected at the bottom end of the stretching rod and located on the outside of the stretching pressure groove, the claw of the stretching claw is movably connected to the second claw groove, the stretching block and the stretching auxiliary block are fixedly connected by a buckle, and a moving card block is fixedly connected to the bottom end of the stretching block, and a moving threaded groove is provided in the middle of the moving card block.

[0012] Furthermore, the base is provided with a pulling groove at the position of the movable card block, and the base is provided with a through groove at one end away from the first fixed groove, the through groove is connected with the pulling groove, and a rotating rod is movably connected in the through groove, and a tightening thread is provided on one side of the pulling groove of the rotating rod, and a handle is fixedly connected to the rotating rod located on the outside of the base, and the tightening thread is threadedly connected to the movable thread groove of the movable card block. A battery is installed in the stretching auxiliary block, and a warning light is installed on the top of the measuring block on the side close to the second fixed screw, one end of the warning light is connected to the puncture needle, that is, the part where the puncture thread touches the secondary groove, and the other end of the warning light is connected to the battery of the stretching auxiliary block through a wire, and the battery of the stretching auxiliary block is connected to the exposed wire of the cable through the stretching claw, and when the puncture needle pierces the insulation layer of the cable, a closed loop is formed, so that the warning light lights up.

[0013] A detection method for a thickness detection device for a cable insulation layer, comprising the following contents: S1. When it is necessary to test the polyvinyl chloride insulated cable, the cable is first placed in the first fixed block, the second fixed block and the stretching block, ensuring that the exposed wire portion of the cable is located at the stretching block. At this time, the first fixed top block is flipped over, and the first fixed thread of the first fixed screw is passed into the first fixed groove by pressing. At this time, the first fixed screw is tightened, so that the first return spring in the first fixed top block pulls the top of the clamping rod back to the bottom of the return groove, so that the claw block presses the insulation layer of the cable. When the first fixed screw cannot rotate; S2. At this time, the stretching auxiliary block of the stretching block is closed and locked with a buckle. At this time, the stretching claw compacts the wire end of the cable through the second return spring, and the rotating rod starts to rotate. When the handle is rotated, the threaded connection relationship between the thread and the movable thread groove is tightened, so that when the handle is rotated, the stretching block will be pulled in the direction of the handle, causing the wire end of the cable to be stretched and the cable to be straightened. Since the insulation layer of the cable has not been pulled, the insulation layer does not change. If the wire of the cable is thicker, when the handle is rotated, that is, when the stretching claw and the wire of the cable produce a friction sound, the handle is stopped at this time, indicating that the maximum stretching force has been reached. If the cable is a thinner wire, it is observed whether the wire at the top of the second slot of the second fixed block is straightened. If it is straightened, it can also be considered that the standard has been met; S3. At this time, the second fixing auxiliary block begins to be closed. When the second fixing auxiliary block is closed, the second fixing thread of the second fixing screw is inserted into the second fixing groove by pressing. At this time, the second fixing screw is tightened, so that the first return spring in the second fixed top block pulls the top of the clamping rod back to the bottom of the return groove, so that the claw block presses the insulation layer of the cable. At this time, the main rod is lowered. When the main rod is lowered, the stop block stops falling after contacting the wire. At this time, the puncture needle is also slowly lowered. After the puncture needle stops being lowered, it means that the puncture needle has contacted the insulation layer of the cable and pierced a small amount of insulation layer of the cable located at the needle tip of the puncture needle or has not pierced it. At this time, part of the puncture thread is located at the auxiliary clamping groove. At this time, the clamping rod is lowered After lifting up, it is released, causing the return clamping spring to release deformation energy, pulling back the puncture auxiliary block, so that the clamping block is merged. At this time, the puncture thread is located by slowly turning the puncture knob of the puncture needle, so that the puncture thread is slowly rotated and punctured in the area where the semi-thread grooves of the clamping block are merged, which will cause the needle tip of the puncture needle to slowly pierce the insulation layer of the cable until the needle tip of the puncture needle touches the top of the cable conductor, which will form a closed loop between the cable conductor and the stretching claw, the prompt light, and the puncture thread and the battery of the stretching auxiliary block, causing the prompt light to light up, indicating that the insulation thickness of the cable has been measured. At this time, the secondary ruler is rotated to align the zero scale with the main ruler. After first reading the value pointed to by the zero scale of the secondary ruler, the thickness of the cable can be obtained by calculation. S4. After the measurement is completed, it is necessary to enter the contact and fixed state. At this time, the puncture needle is rotated in the opposite direction so that the needle tip of the puncture needle leaves the second card slot. Then, the stretching auxiliary block is contacted with the buckle of the stretching block, and the second fixing screw and the first fixing screw are released. The cable can be taken out and the device can be carried for testing at any time next time.

[0014] Technical effects and advantages of the present invention: 1. The present invention realizes 0.02mm-level high-precision measurement by adopting a combination of a main ruler and a secondary ruler, meeting the requirements of industrial standards. The puncture needle and the main rod are synchronously positioned by the stopper, and the zero scale is aligned in the initial state, ensuring the consistency of the measurement reference and reducing human operation errors. It is easy to carry and can be measured at any time.

[0015] 2. The present invention combines claw blocks with silicone pads. The claw blocks pressurized by springs are adapted to cables of different diameters. The silicone material provides flexible contact pressure, taking into account both fixing force and anti-slip protection. At the same time, the three-stage slot structure: the coordinated fixing of the first fixing block, the second fixing block and the stretching block ensures that the cable axis is strictly aligned with the measuring component.

[0016] 3. The present invention triggers the warning light circuit through the puncture needle-wire contact to achieve instant electronic feedback of physical contact, avoiding the problem of over-puncture damaging the wire or insufficient measurement. The puncture needle achieves micron-level feeding through the clamping block thread pair to avoid measurement deviation caused by impact puncture.

[0017] 4. The present invention adopts a design in which the diameter of the puncture thread is larger than the needle body, which not only provides a mechanical stop to prevent excessive puncture, but also provides a circuit conduction prompt to double guarantee the safety of operation. Through mechanical innovation and electromechanical combination, it solves the industry pain points such as low efficiency of traditional measurement, high cost of ultrasonic testing equipment, and irreversible destructive testing of slices. It is particularly suitable for scenarios such as power inspection and cable manufacturing quality inspection, and has significant technological progress and commercial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 The schematic diagram is opened for the overall structure of the present invention.

[0020] Figure 3 It is a schematic diagram of the overall structure explosion of the present invention.

[0021] Figure 4 It is a schematic diagram of the explosion of the pressing component structure of the present invention.

[0022] Figure 5 It is a schematic exploded view of the stretching claw structure of the present invention.

[0023] Figure 6 It is a schematic diagram of the main rod and puncture needle structure of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the stretching auxiliary block of the present invention.

[0025] Figure 8 It is a schematic diagram of the structure of the puncture needle of the present invention.

[0026] Fig. 9For the present invention Figure 8 Schematic diagram of the structure of the clamping block.

[0027] Fig.10 It is a schematic diagram of the cross-sectional structure of the second fixed top block and the measuring block after explosion of the present invention.

[0028] Fig.11 For the present invention Fig.10 Schematic diagram of the structure at point A in the middle.

[0029] Fig.12 It is a schematic diagram of the cross-sectional structure of the second fixed top block and the measuring block of the present invention.

[0030] Fig.13 For the present invention Fig.12 Schematic diagram of the structure at point B in the middle.

[0031] Fig.14 It is a schematic diagram of the base structure of the present invention.

[0032] Fig.15 It is a schematic diagram of the cross-sectional structure of the stretching block of the present invention.

[0033] The reference numerals are: 1, base; 101, pull groove; 1011, through groove; 102, first fixed groove; 103, second fixed groove; 2, first fixed block; 201, first clamping groove; 202, first fixed auxiliary block; 203, first fixed top block; 204, first fixed side block; 2041, first fixed screw; 2042, first fixed thread; 3, second fixed block; 301, second clamping groove; 3011, first claw groove; 30111, clamping groove pad; 302, second fixed auxiliary block; 303, second fixed top block; 3031, return groove; 3032, extrusion groove; 304, second fixed side block; 3041, second fixed screw; 3042, second fixed thread; 305, pressing assembly; 3051, claw block; 30511, first claw pad; 3052, clamping rod; 3053, first return spring; 4, stretching block; 401, stretching groove; 4011, second claw pad; 4012, first Second claw groove; 402, stretching auxiliary block; 4021, stretching return groove; 4022, stretching pressure groove; 403, stretching claw; 4031, stretching rod; 4032, second return spring; 404, moving block; 4041, moving thread groove; 5, measuring block; 501, main groove; 5011, main card slot; 502, auxiliary groove; 5021, auxiliary card slot; 5022, return card slot; 5023, steering groove; 6, main rod; 601, main card block; 602, Main ruler; 603, stop block; 7, puncture needle; 701, ring sleeve; 702, auxiliary ruler; 703, puncture knob; 704, puncture thread; 705, clamping block; 7051, half thread groove; 7052, puncture auxiliary block; 7053, return clamping spring; 7054, steering wheel; 7055, tensioning rope; 706, clamping rod; 7061, positioning clamping block; 707, warning light; 8, rotating rod; 801, tensioning thread; 802, grip; 9, cable. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative. The thickness detection device and detection method for the cable insulation layer involved in the present invention are not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0035] Reference Figure 1 and Figure 2The present invention provides a device for detecting the thickness of an insulating layer of a cable and a method for detecting the thickness of the insulating layer of the cable, comprising a base 1, a first fixed block 2 is fixedly connected to one side of the top of the base 1, a second fixed block 3 is fixedly connected to one side of the base 1 located near the middle of the first fixed block 2, a stretching block 4 is installed on the side of the base 1 located at the second fixed block 3 away from the first fixed block 2, a cable 9 is placed on the first fixed block 2, the second fixed block 3 and the stretching block 4, a bare wire part of the cable 9 is located at the stretching block 4, one side of the first fixed block 2 is connected to a first fixed auxiliary block 202 by a hinge, the top of the first fixed auxiliary block 202 is fixedly connected to a first fixed top block 203, and one side of the stretching block 4 is connected to a stretching auxiliary block 40 by a hinge. 2, one side of the second fixed block 3 is connected to the second fixed auxiliary block 302 through a hinge, the top of the second fixed auxiliary block 302 is fixedly connected to the second fixed top block 303, the middle of the second fixed top block 303 and the middle of the second fixed block 3 are at the same projection position, the second fixed auxiliary block 302 is located at the top of the side away from the second fixed top block 303 and is fixedly connected to the measuring block 5, one side of the middle of the measuring block 5 is provided with a main groove 501, the other side of the measuring block 5 is provided with a secondary groove 502, the main groove 501 is movably connected with the main rod 6, the secondary groove 502 is movably connected with the puncture needle 7, the measuring block 5 is provided with a secondary groove 5021 in the middle of the secondary groove 502, and both sides of the secondary groove 5021 of the measuring block 5 are provided with There is a return card slot 5022, and the return card slot 5022 is provided with a turning groove 5023 on the side away from the auxiliary card slot 5021. A puncture thread 704 is provided on the side near the bottom of the middle end of the puncture needle 7. The maximum diameter of the puncture thread 704 is larger than the diameter of the puncture needle 7. The auxiliary slot 502 is movably connected with the puncture thread 704 on the puncture needle 7. The puncture thread 704 of the puncture needle 7 is located at the auxiliary card slot 5021. Clamps 705 are installed on both sides of the puncture thread 704 of the puncture needle 7. The clamps 705 are located in the middle of one side of the puncture thread 704. A half-thread groove 7051 is provided. The half-thread grooves 7051 of the two clamps 705 are combined and threadedly connected with the puncture thread 704 of the puncture needle 7. The clamp 705 is located near the return card slot 5022. One side of the slot 5022 is fixedly connected with a puncture sub-block 7052, and the clamping block 705 is movably clamped with the return slot 5022 through the puncture sub-block 7052. The outer wall of the puncture sub-block 7052 is movably sleeved with a return clamping spring 7053, one end of the return clamping spring 7053 is fixedly connected to the clamping part of the puncture sub-block 7052, and the other end is fixedly connected to the bottom of the return slot 5022 close to the clamping block 705. The two return clamping springs 7053 both control the puncture sub-block 7052 to move in the direction of the puncture thread 704. The puncture needle 7 is located on the side of the return slot 5022 away from the auxiliary slot 5021 and is provided with a steering groove 5023, and a steering wheel 7054 is installed in the steering groove 5023.A clamping rod 706 is movably connected to one side of the top of the measuring block 5, and a positioning clamping block 7061 is fixedly connected to the bottom end of the clamping rod 706. A clamping slot is provided at the bottom end of the positioning clamping block 7061 of the measuring block 5. When the clamping rod 706 presses the knob, the positioning clamping block 7061 will be clamped into the clamping slot at the bottom. When the clamping rod 706 lifts the knob, the positioning clamping block 7061 will be separated from the clamping slot at the bottom and can rotate freely. The outer walls of the two steering wheels 7054 are provided with tensioning ropes 7055, one end of the two tensioning ropes 7055 are fixedly connected to the middle part of one side of the nearest puncture sub-block 7052, and the other ends of the two tensioning ropes 7055 are fixedly connected to one side of the upper part of the positioning clamping block 7061 of the clamping rod 706. When the puncture needle 7 is rotated, the tension rope 7055 transmits the tension through the steering wheel 7054 to pull the clamping block 705 in the direction of the steering wheel 7054; the top of the measuring block 5 of the puncture needle 7 is movably connected with an equidistantly arranged ring sleeve 701, and the equidistantly arranged ring sleeve 701 is fixedly connected to the auxiliary ruler 702, and the top of the puncture needle 7 is fixedly connected with a puncture knob 703, and the bottom end of the main groove 501 is provided with a main card slot 5011, and the main card block 601 is fixedly connected to the outer wall of the bottom end of the main rod 6 and located in the main card slot 5011, and the main ruler 602 is fixedly connected to the top of the main rod 6 and located on the outer wall of the measuring block 5, and the abutment block 603 is fixedly connected to the bottom end of the main rod 6 and located at the second fixed auxiliary block 302. After the secondary ruler 702 is rotated at the same height, it is located at the same horizontal line as the main ruler 602, and the zero scale line is aligned. At this time, the middle of the bottom end of the stop block 603 is at the same horizontal height as the needle tip of the puncture needle 7. The main ruler 602 is a high-precision centimeter ruler with a maximum measuring range of 6cm. The secondary ruler 702 is a high-precision millimeter ruler. Each scale line of the secondary ruler 702 is 0.98mm, the total measuring range is 49mm, and there are 50 scales. The maximum measuring range scale line of the secondary ruler 702 is aligned with the 49mm of the main ruler 602. The second fixed top block 303 is located in the middle of the second card slot 301 and is provided with a return slot 3031. The second fixed top block 303 is located at the bottom of the return slot 3031 and is provided with an extrusion slot 3032. The first fixed top block The internal structure of the first fixed top block 203 is the same as that of the second fixed top block 303, that is, both are provided with a return groove 3031 and an extrusion groove 3032, the top of the first fixed block 2 is provided with a first card slot 201, the top of the second fixed block 3 is provided with a second card slot 301, the second card slot 301 is provided with a first claw groove 3011, the second card slot 301 is fixedly connected with a card slot pad 30111, the card slot pad 30111 is fitted with the second card slot 301, the return groove 3031 is movably connected with a pressing component 305, the pressing component 305 includes a claw block 3051, the top of the claw block 3051 is fixedly connected with a clamping rod 3052, the outer wall of the clamping rod 3052 is movably sleeved with a first return spring 3053,The bottom end of the claw block 3051 is fixedly connected with the first claw pad 30511, the clamping rod 3052 is movably clamped with the return groove 3031, the top of the first return spring 3053 is fixedly connected with the clamping end of the clamping rod 3052, the bottom end of the first return spring 3053 is fixedly connected with the bottom end of the return groove 3031, the first return spring 3053 pulls the claw block 3051 to be squeezed in the direction of the second clamping groove 301, the claw block 3051 is fitted with the first claw pad 30511, the claw block 3051 is movably connected with the first claw groove 3011, the claw of the claw block 3051 can enter the first claw groove 3011, the structure of the first clamping groove 201 is consistent with the second clamping groove 301 The structures are all arranged in the same way, and are all provided with a card slot pad 30111 and a first claw slot 3011. The first fixed top block 203 is provided with a downward pressing component 305 structure which is the same as that in the second fixed top block 303, that is, the first fixed top block 203 is also provided with a claw block 3051, a card connecting rod 3052, and a first return spring 3053, and the connection relationship is the same, wherein the claw block 3051 and the first claw pad 30511 of the first fixed top block 203 are mirror-imaged with the claw block 3051 and the first claw pad 30511 of the second fixed top block 303, the top end of the first fixed auxiliary block 202 is located on the other side of the hinge and is fixedly connected to the first fixed side block 204, and the second fixed auxiliary block 302 is located on the other side of the hinge and is fixedly connected There is a second fixed side block 304, the middle of the first fixed side block 204 is movably connected with the first fixed screw 2041, the middle of the second fixed side block 304 is movably connected with the second fixed screw 3041, the bottom end of the first fixed screw 2041 is provided with a first fixed thread 2042, the bottom end of the second fixed screw 3041 is provided with a second fixed thread 3042, the top of the base 1 and located at the bottom end of the second fixed screw 3041 is provided with a first fixed groove 102, the base 1 is located at the bottom end of the second fixed thread 3042 is provided with a second fixed groove 103, the first fixed auxiliary block 202 is connected by a hinge and the first fixed thread at the bottom end of the first fixed screw 2041 of the first fixed side block 204 The second fixing block 302 is threadedly connected with the first fixing groove 102 to fit tightly with the top of the first fixing block 2. The second fixing auxiliary block 302 is threadedly connected with the second fixing groove 103 through a hinge and the second fixing thread 3042 at the bottom of the second fixing screw 3041 of the second fixing side block 304 to fit tightly with the top of the second fixing block 3. A stretching return groove 4021 is provided in the middle of the stretching auxiliary block 402. A stretching pressing groove 4022 is provided at the bottom of the stretching return groove 4021. A stretching rod 4031 is installed in the stretching return groove 4021. The stretching rod 4031 is movably connected with the stretching return groove 4021. The outer wall of the stretching rod 4031 is movably sleeved with a second return spring 4032.The bottom end of the stretching rod 4031 is fixedly connected to the top end of the second return spring 4032, and the bottom end of the second return spring 4032 is fixedly connected to the bottom end of the stretching return groove 4021. A stretching groove 401 is provided at the top of the stretching block 4, and a second claw groove 4012 is provided in the stretching groove 401. A second claw pad 4011 is installed in the stretching groove 401. A stretching claw 403 is fixedly connected to the bottom end of the stretching rod 4031 and located on the outside of the stretching pressure groove 4022, and the claw of the stretching claw 403 is movably connected to the second claw groove 4012. The stretching block 4 is fixedly connected to the stretching auxiliary block 402 by a buckle, and a moving card block 404 is fixedly connected to the bottom end of the stretching block 4. A movable thread groove 4041 is provided in the middle of the base 1, a pull groove 101 is provided at the position of the movable card block 404, a through groove 1011 is provided at the end of the base 1 located away from the first fixed groove 102, the through groove 1011 is connected with the pull groove 101, a rotating rod 8 is movably connected in the through groove 1011, the rotating rod 8 is provided with a tightening thread 801 on one side of the pull groove 101, the rotating rod 8 is located on the outside of the base 1 and is fixedly connected with a handle 802, the tightening thread 801 is threadedly connected with the movable thread groove 4041 of the movable card block 404, a battery is installed in the stretching auxiliary block 402, and a warning light 70 is installed on the top of the measuring block 5 on the side close to the second fixed screw 3041 7, one end of the warning light 707 is connected to the puncture needle 7, that is, the part where the puncture thread 704 touches the auxiliary groove 502, and the other end of the warning light 707 is connected to the battery of the stretching auxiliary block 402 through a wire, and the battery of the stretching auxiliary block 402 is connected to the exposed wire of the cable 9 through the stretching claw 403. When the puncture needle 7 pierces the insulation layer of the cable 9, a closed loop is formed, so that the warning light 707 lights up. Due to the arc-shaped structure of the first card slot 201, the second card slot 301 and the stretching slot 401, the center of the cable 9 after being straightened coincides with the center of the first card slot 201, the second card slot 301 and the stretching slot 401, and the main rod 6 and the puncture needle 7 are also located in the center, which naturally leads to accurate measurement. The second The claw pad 4011, the slot pad 30111 and the first claw pad 30511 are all made of silicone. When being straightened, the insulating layer of the cable 9 is not pulled, resulting in no change in the insulating layer. It depends on the actual situation. If the wire of the cable 9 is thicker, then when the handle 802 is rotated, the wire of the cable 9 cannot be moved, that is, when the stretching claw 403 and the wire of the cable 9 produce a friction sound, then the handle 802 is stopped at this time, indicating that the maximum stretching force has been reached. If the cable 9 is a thinner wire, then by observing whether the wire at the top of the second slot 301 of the second fixing block 3 is straightened, if it is straightened, it can also be considered that it has reached the standard. It needs to be explained that when straightening, a corresponding stretching method should be formulated according to the thickness of the cable to be measured.If the thickness of the insulation layer is more than 3mm, the sound produced by direct pulling can be used to determine that the stretching is complete.

[0036] Working principle of the present invention: When it is necessary to test the polyvinyl chloride insulated cable, i.e., cable 9, firstly, place the cable 9 in the first fixing block 2, the second fixing block 3, and the stretching block 4, ensuring that the exposed wire portion of the cable 9 is located at the stretching block 4. At this time, after the first fixing top block 203 is turned over, the first fixing thread 2042 of the first fixing screw 2041 is passed into the first fixing groove 102 by pressing, and the first fixing screw 2041 is tightened at this time, so that the first return spring in the first fixing top block 203 is 3053 pulls the top of the clamping rod 3052 back to the bottom of the return groove 3031, so that the claw block 3051 presses the insulation layer of the cable 9. At this time, due to the silicone material of the claw block 3051, it can fit with the insulation layer of the cable 9 to improve the tightness of the pressing. When the first fixing screw 2041 cannot rotate, it means that the pressing component 305 of the first fixed top block 203 has fixed the cable 9 located at the first fixing block 2. At this time, the stretching auxiliary block 402 of the stretching block 4 is closed and the mounting is used. The buckle is locked. At this time, the stretching claw 403 compacts the wire end of the cable 9 through the second return spring 4032. At this time, the rotating rod 8 starts to rotate. When the handle 802 is rotated, the threaded connection between the thread 801 and the movable thread groove 4041 is tightened. As the handle 802 rotates, the stretching block 4 is pulled in the direction of the handle 802. As the movement progresses, the wire end of the cable 9 is stretched. As the stretching progresses, the cable 9 is straightened. At the same time, when it is straightened, The insulation layer of the cable 9 has not been pulled, resulting in no change in the insulation layer. According to the actual situation, if the wire of the cable 9 is thicker, when the handle 802 is rotated, the wire of the cable 9 cannot be moved, that is, when the tension claw 403 and the wire of the cable 9 produce a friction sound, the rotation of the handle 802 is stopped at this time, indicating that the maximum tension has been reached. If the cable 9 is a thinner wire, it is observed whether the wire at the top of the second slot 301 of the second fixing block 3 is straightened. If it is straightened, it can also be considered that the standard has been reached; At this time, the second fixing auxiliary block 302 begins to be closed. When the second fixing auxiliary block 302 is closed, the second fixing thread 3042 of the second fixing screw 3041 is passed into the second fixing groove 103 by pressing. At this time, the second fixing screw 3041 is tightened, so that the first return spring 3053 in the second fixing top block 303 pulls the top of the clamping rod 3052 back to the bottom of the return groove 3031, so that the claw block 3051 presses the insulation layer of the cable 9. At this time, the main rod 6 is lowered. When the main rod 6 is lowered, the stop block 603 contacts the wire and stops. The puncture needle 7 is slowly lowered, and when the lowering of the puncture needle 7 stops, it means that the puncture needle 7 has contacted the insulation layer of the cable 9, and punctured a small amount of insulation layer of the cable 9 located at the needle tip of the puncture needle 7, or has not punctured it. At this time, part of the puncture thread 704 is located at the auxiliary card slot 5021. At this time, the card rod 706 is lifted and released, causing the return clamping spring 7053 to release the deformation energy, and the puncture auxiliary block 7052 is pulled back, so that the clamping block 705 is merged. At this time, the puncture thread 704 is located at the auxiliary card slot 5021. The puncture knob 703 of 7 causes the puncture thread 704 to slowly rotate and puncture in the area where the semi-thread groove 7051 of the clamping block 705 merges, so that the needle tip of the puncture needle 7 will slowly puncture the insulation layer of the cable 9 until the needle tip of the puncture needle 7 contacts the top of the wire of the cable 9, which will cause the wire of the cable 9 to form a closed loop with the stretching claw 403, the prompt light 707, the puncture thread 704 and the battery of the stretching auxiliary block 402, thereby causing the prompt light 707 to light up, indicating that the insulation thickness of the cable 9 has been measured. At this time, by rotating the secondary ruler 702 The zero scale obtained is aligned with the main scale 602. After reading the value pointed to by the zero scale of the secondary scale 702, the scale line on the secondary scale 702 and the scale line aligned on the main scale 602 can be read. a+b×0.02=h, where a is the value pointed to by the zero scale of the secondary scale 702 on the main scale 602, and b is the number of scale lines between the scale line aligned with the main scale 602 and the zero scale line of the secondary scale 702. 0.02mm means that each scale line on the secondary scale 702 represents 0.02mm on the main scale 602. The thickness h of the cable 9 can be obtained by calculation. When the measurement is completed, it is necessary to enter the contact and fixed state. At this time, the puncture needle 7 is rotated in the opposite direction so that the needle tip of the puncture needle 7 leaves the second slot 301. Then, the stretching auxiliary block 402 is contacted with the buckle of the stretching block 4, and then the second fixing screw 3041 and the first fixing screw 2041 are released. Then, the cable 9 can be taken out and the device can be carried for testing at any time next time.

[0037] Finally: 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 protection scope of the present invention.

Claims

1. A device for detecting the thickness of a cable insulation layer, characterized in that: The invention comprises a base (1), wherein a first fixing block (2) is fixedly connected to one side of the top of the base (1), a second fixing block (3) is fixedly connected to one side of the base (1) located near the middle of the first fixing block (2), a stretching block (4) is installed on the side of the base (1) located away from the first fixing block (2) and the second fixing block (3), a cable (9) is placed on the first fixing block (2), the second fixing block (3) and the stretching block (4), a bare wire portion of the cable (9) is located at the stretching block (4), one side of the first fixing block (2) is connected to a first fixing auxiliary block (202) via a hinge, The top end of the first fixed auxiliary block (202) is fixedly connected to the first fixed top block (203); one side of the stretching block (4) is connected to the stretching auxiliary block (402) via a hinge; one side of the second fixed block (3) is connected to the second fixed auxiliary block (302) via a hinge; the top end of the second fixed auxiliary block (302) is fixedly connected to the second fixed top block (303); the middle of the second fixed top block (303) and the middle of the second fixed block (3) are at the same projection position; and the top end of the second fixed auxiliary block (302) which is located away from the second fixed top block (303) is fixedly connected to the measuring block (5).

2. A device for detecting the thickness of a cable insulation layer according to claim 1, characterized in that: A main slot (501) is provided on one side of the middle of the measuring block (5), and a secondary slot (502) is provided on the other side of the measuring block (5). A main rod (6) is movably connected to the main slot (501), and a puncture needle (7) is movably connected to the secondary slot (502). A secondary slot (5021) is provided on the middle of the secondary slot (502) of the measuring block (5), and return slots (5021) are provided on both sides of the secondary slot (5021) of the measuring block (5). 22), the return slot (5022) is provided with a turning slot (5023) on the side away from the auxiliary slot (5021), the middle end of the puncture needle (7) is provided with a puncture thread (704) on the side close to the bottom end, the maximum diameter of the puncture thread (704) is larger than the diameter of the puncture needle (7), the auxiliary slot (502) is movably engaged with the puncture thread (704) on the puncture needle (7), and the puncture thread (704) of the puncture needle (7) is The two sides of the auxiliary card slot (5021) are provided with clamping blocks (705), and the middle part of the clamping blocks (705) on one side of the puncture thread (704) is provided with a semi-thread groove (7051). The semi-thread grooves (7051) of the two clamping blocks (705) are combined and threadedly connected to the puncture thread (704) of the puncture needle (7). The side of the clamping blocks (705) close to the return card slot (5022) is fixedly connected with the puncture thread (704). The piercing sub-block (7052) is movably connected to the return slot (5022) by the clamping block (7052), and the outer wall of the piercing sub-block (7052) is movably sleeved with a return clamping spring (7053), one end of the return clamping spring (7053) is fixedly connected to the clamping portion of the piercing sub-block (7052), and the other end is fixedly connected to the bottom of the return slot (5022) near the clamping block (705).

3. A device for detecting the thickness of a cable insulation layer according to claim 2, characterized in that: The two return clamping springs (7053) both control the puncture auxiliary block (7052) to move in the direction of the puncture thread (704); the puncture needle (7) is provided with a steering groove (5023) on the side of the return slot (5022) away from the auxiliary slot (5021); a steering wheel (7054) is installed in the steering groove (5023); a clamping rod (706) is movably clamped on one side of the top of the measuring block (5); a positioning clamping block (7061) is fixedly connected to the bottom end of the clamping rod (706); a clamping groove is provided at the bottom end of the positioning clamping block (7061); when the clamping rod (706) presses the knob, the positioning clamping block (7061) is clamped into the clamping groove at the bottom end; when the clamping rod (706) lifts the knob, the positioning clamping block (7061) is separated from the clamping groove at the bottom end and can rotate freely; the two steering wheels (705 4) are provided with tension ropes (7055) on the outer wall, one end of each of the tension ropes (7055) is fixedly connected to the middle of one side of the nearest puncture auxiliary block (7052), and the other end of each of the tension ropes (7055) is fixedly connected to one side of the upper part of the positioning clamping block (7061) of the clamping rod (706), and when the clamping rod (706) rotates, the tension rope (7055) transmits the tension through the steering wheel (7054) to pull the clamping block (705) in the direction of the steering wheel (7054); the top end of the puncture needle (7) located on the measuring block (5) is movably sleeved with equidistantly arranged ring sleeves (701), and the equidistantly arranged ring sleeves (701) are fixedly connected to the auxiliary ruler (702); the top end of the puncture needle (7) is fixedly connected to a puncture knob (703), and the bottom end of the main slot (501) is provided with a main clamping slot (5011).

4. A device for detecting the thickness of a cable insulation layer according to claim 3, characterized in that: The main clamping block (601) is fixedly connected to the outer wall of the bottom end of the main rod (6) and located in the main clamping slot (5011); the main ruler (602) is fixedly connected to the top end of the main rod (6) and located on the outer wall of the measuring block (5); the lower end of the main rod (6) and located at the second fixed auxiliary block (302) is fixedly connected to the stop block (603); in the initial state, after the secondary ruler (702) rotates at the same height, they are both located on the same horizontal line as the main ruler (602), and the zero scale line is aligned. At this time, the middle of the bottom end of the stop block (603) and the needle tip of the puncture needle (7) are at the same horizontal height.

5. A device for detecting the thickness of a cable insulation layer according to claim 4, characterized in that: The second fixed top block (303) is provided with a return groove (3031) at the middle of the second clamping slot (301), and the second fixed top block (303) is provided with an extrusion groove (3032) at the bottom of the return groove (3031). The first fixed top block (203) and the second fixed top block (303) have the same internal structure, that is, both are provided with a return groove (3031) and an extrusion groove (3032). The first fixed block (201) is provided with a first clamping slot (201) at the top end, and the second fixed block (3) is provided with a second clamping slot (301) at the top end. The second clamping slot (301) is provided with a first claw groove (3011). A slot pad (30111) is fixedly connected in each of the two slots (301), and the slot pad (30111) is fitted with the second slot (301). A pressing assembly (305) is movably connected in the return slot (3031), and the pressing assembly (305) comprises a claw block (3051), and a clamping rod (3052) is fixedly connected to the top of the claw block (3051), and a first return spring (3053) is movably sleeved on the outer wall of the clamping rod (3052). The bottom end of each of the claw blocks (3051) is fixedly connected to the first claw pad (30511), and the clamping rod (3052) is movably clamped with the return slot (3031). The top end of the first return spring (3053) is fixedly connected to the clamping end of the clamping rod (3052), the bottom end of the first return spring (3053) is fixedly connected to the bottom end of the return groove (3031), the first return spring (3053) pulls the claw block (3051) to be squeezed in the direction of the second clamping groove (301), the claw block (3051) is fitted with the first claw pad (30511), the claw block (3051) is movably connected to the first claw groove (3011), the claw of the claw block (3051) can enter the first claw groove (3011), the structure of the first clamping groove (201) is consistent with the second clamping groove (201), and the claw of the claw block (3051) is movably connected to the first claw groove (3011). The structures of the grooves (301) are all arranged in the same manner, and are all provided with a slot pad (30111) and a first claw groove (3011). The first fixed top block (203) is provided with a pressing assembly (305) structure identical to that in the second fixed top block (303), that is, the first fixed top block (203) is also provided with a claw block (3051), a clamping rod (3052), and a first return spring (3053), and the connection relationships are all the same, wherein the claw block (3051) and the first claw pad (30511) of the first fixed top block (203) and the claw block (3051) and the first claw pad (30511) of the second fixed top block (303) are arranged in a mirror image.

6. A device for detecting the thickness of a cable insulation layer according to claim 5, characterized in that: The top end of the first fixing auxiliary block (202) is located on the other side of the hinge and is fixedly connected to the first fixing side block (204); the second fixing auxiliary block (302) is located on the other side of the hinge and is fixedly connected to the second fixing side block (304); the middle of the first fixing side block (204) is movably connected to the first fixing screw (2041); the middle of the second fixing side block (304) is movably connected to the second fixing screw (3041); the bottom end of the first fixing screw (2041) is provided with a first fixing thread (2042); the bottom end of the second fixing screw (3041) is provided with a second fixing thread (3042); the top end of the base (1) is located at the bottom end of the second fixing screw (3041); A first fixing groove (102) is provided, and a second fixing groove (103) is provided at the bottom end of the second fixing thread (3042) of the base (1); the first fixing auxiliary block (202) is threadedly connected to the first fixing groove (102) through a hinge and a first fixing thread (2042) at the bottom end of a first fixing screw (2041) of the first fixing side block (204) so ​​as to be tightly fitted with the top end of the first fixing block (2); the second fixing auxiliary block (302) is threadedly connected to the second fixing groove (103) through a hinge and a second fixing thread (3042) at the bottom end of a second fixing screw (3041) of the second fixing side block (304) so ​​as to be tightly fitted with the top end of the second fixing block (3).

7. A device for detecting the thickness of a cable insulation layer according to claim 6, characterized in that: The middle of the stretching auxiliary block (402) is provided with a stretching return groove (4021), the bottom end of the stretching return groove (4021) is provided with a stretching pressing groove (4022), a stretching rod (4031) is installed in the stretching return groove (4021), the stretching rod (4031) is movably connected to the stretching return groove (4021), the outer wall of the stretching rod (4031) is movably sleeved with a second return spring (4032), the bottom end of the stretching rod (4031) is fixedly connected to the top end of the second return spring (4032), the bottom end of the second return spring (4032) is fixedly connected to the bottom end of the stretching return groove (4021), and the stretching block ( A stretching groove (401) is provided at the top end of the stretching groove (401), a second claw groove (4012) is provided in the stretching groove (401), a second claw pad (4011) is installed in the stretching groove (401), a stretching claw (403) is fixedly connected at the bottom end of the stretching rod (4031) and located outside the stretching pressing groove (4022), a claw of the stretching claw (403) is movably connected to the second claw groove (4012), the stretching block (4) is fixedly connected to the stretching auxiliary block (402) by a buckle, a movable clamping block (404) is fixedly connected at the bottom end of the stretching block (4), and a movable threaded groove (4041) is provided in the middle of the movable clamping block (404).

8. A device for detecting the thickness of a cable insulation layer according to claim 7, characterized in that: The base (1) is provided with a draw groove (101) at the position of the movable block (404); the base (1) is provided with a through groove (1011) at one end away from the first fixed groove (102); the through groove (1011) is connected with the draw groove (101); a rotating rod (8) is movably connected in the through groove (1011); a tightening thread (801) is provided on one side of the draw groove (101); the rotating rod (8) is fixedly connected with a handle (802) at the outer side of the base (1); the tightening thread (801) is threadedly connected with the movable thread groove (4041) of the movable block (404); A battery is installed in the stretching auxiliary block (402), and a warning light (707) is installed on the top of the measuring block (5) on a side close to the second fixing screw (3041). One end of the warning light (707) is connected to the puncture needle (7), that is, the part where the puncture thread (704) touches the auxiliary groove (502), and the other end of the warning light (707) is connected to the battery of the stretching auxiliary block (402) through a wire. The battery of the stretching auxiliary block (402) is connected to the exposed wire of the cable (9) through the stretching claw (403). When the puncture needle (7) pierces the insulation layer of the cable (9), a closed circuit is formed, so that the warning light (707) is lit.

9. A detection method for a thickness detection device for a cable insulation layer, implemented in a thickness detection device for a cable insulation layer as claimed in claim 8, characterized in that: Includes the following: S1. When it is necessary to test the polyvinyl chloride insulated cable, i.e., the cable (9), the cable (9) is first placed in the first fixing block (2), the second fixing block (3), and the stretching block (4), ensuring that the exposed wire portion of the cable (9) is located at the stretching block (4). At this time, the first fixing top block (203) is flipped over, and the first fixing thread (2042) of the first fixing screw (2041) is pressed into the first fixing groove (102). The first fixing screw (2041) is tightened, so that the first return spring (3053) in the first fixing top block (203) pulls the top end of the clamping rod (3052) back to the bottom end of the return groove (3031), so that the claw block (3051) presses the insulation layer of the cable (9). When the first fixing screw (2041) cannot rotate; S2. At this time, the stretching auxiliary block (402) of the stretching block (4) is closed and locked with a buckle. At this time, the stretching claw (403) compacts the wire end of the cable (9) through the second return spring (4032). At this time, the rotating rod (8) starts to rotate. When the handle (802) is rotated, the threaded connection relationship between the thread (801) and the movable thread groove (4041) is tightened, so that when the handle (802) is rotated, the stretching block (4) is pulled in the direction of the handle (802), causing the wire of the cable (9) to be tightened. The end is stretched, causing the cable (9) to be straightened. Since the insulation layer of the cable (9) has not been pulled, the insulation layer does not change. If the wire of the cable (9) is thicker, when the handle (802) rotates, that is, when the stretching claw (403) and the wire of the cable (9) produce a friction sound, the handle (802) is stopped from rotating, indicating that the maximum stretching force has been reached. If the cable (9) is a thinner wire, it is observed whether the wire at the top of the second slot (301) of the second fixing block (3) is straightened. If it is straightened, it can also be considered that the standard has been reached; S3, at this time, the second fixing auxiliary block (302) begins to be closed. When the second fixing auxiliary block (302) is closed, the second fixing thread (3042) of the second fixing screw (3041) is inserted into the second fixing groove (103) by pressing, and the second fixing screw (3041) is tightened at this time, so that the first return spring (3053) in the second fixing top block (303) pulls the top end of the clamping rod (3052) back to the bottom end of the return groove (3031), so that the claw block (3051) presses the cable (9) The main rod (6) is lowered at this time. When the main rod (6) is lowered, the block (603) stops falling after contacting the wire. At this time, the puncture needle (7) is also slowly lowered. When the puncture needle (7) stops being lowered, it means that the puncture needle (7) has contacted the insulation layer of the cable (9) and punctured a small amount of insulation layer of the cable (9) at the needle tip of the puncture needle (7) or has not punctured it. At this time, a part of the puncture thread (704) is located at the auxiliary card slot (5021). At this time, the card rod (706) is lowered. After lifting up, it is released, causing the return clamping spring (7053) to release its deformation energy, pulling back the puncture sub-block (7052), thereby merging the clamping block (705). At this time, the puncture thread (704) is located by slowly rotating the puncture knob (703) of the puncture needle (7), so that the puncture thread (704) is slowly rotated and pierced in the area where the semi-thread groove (7051) of the clamping block (705) merges, causing the needle tip of the puncture needle (7) to slowly pierce the insulation layer of the cable (9) until the puncture needle (7) is When the needle tip contacts the top of the wire of the cable (9), a closed circuit is formed between the wire of the cable (9), the stretching claw (403), the indicator light (707), the puncture thread (704) and the battery of the stretching auxiliary block (402), thereby lighting the indicator light (707). At this time, it is indicated that the thickness of the insulation layer of the cable (9) has been measured. At this time, the secondary ruler (702) is rotated so that the zero scale is aligned with the main ruler (602), and the value pointed to by the zero scale of the secondary ruler (702) is read first, and then the thickness of the cable (9) can be obtained by calculation; S4. After the measurement is completed, it is necessary to enter the contact fixing state. At this time, the puncture needle (7) is rotated in the opposite direction so that the needle tip of the puncture needle (7) leaves the second slot (301). At this time, the stretching auxiliary block (402) is brought into contact with the buckle of the stretching block (4), and the second fixing screw (3041) and the first fixing screw (2041) are released. The cable (9) is then taken out, and the device can be carried for the next test at any time.

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