A device for detecting a high-voltage power cable of a polypropylene insulation

Abstract

The utility model discloses a kind of polypropylene insulating material's high-voltage power cable detection device, it is related to power cable detection technical field, including: detection box, control panel, top sliding cover, glass window, install in the fire spraying device of detection box interior, the inner wall of the detection box is equipped with detection mechanism, the detection mechanism also has: rotating part, the rotating part is located in the inner wall of detection box, the rotating part includes ventilation plate;The utility model is set through the magnetic attraction quick clamp structure of upper magnetic block and lower magnetic block in clamping part, cooperate with the sliding guide of limiting box, when clamping cable, only need to pull pull ring to put into cable, loosen after magnetic force automatic locking, solve the problem that traditional clamp must use tool to tighten bolt to bring cumbersome operation, time-consuming and labor-consuming, avoid the problem such as uncontrolled clamping force caused by improper use of tool or bolt thread slip.

Description

Technical Field

[0001] This utility model relates to the field of power cable testing technology, specifically to a high-voltage power cable testing device with polypropylene insulation material. Background Technology

[0002] Polypropylene insulation material is used in the manufacture of high-voltage power cables due to its excellent electrical properties and environmentally friendly recyclability. To ensure its safe operation, its flame-retardant properties must be rigorously evaluated using specialized testing equipment before production begins, i.e., assessing the cable's ability to prevent the spread of flames under simulated flame conditions.

[0003] However, the current testing procedures have several obvious drawbacks: First, cable samples are mostly clamped using traditional bolt fastening methods, which require staff to use tools to tighten both sides of the clamps. This operation is cumbersome and slow, affecting testing efficiency.

[0004] Secondly, most existing testing equipment has a fixed burner position, which can only burn one side of the cable and cannot achieve comprehensive combustion testing in the circumferential direction. This may lead to inaccurate evaluation results and fail to truly reflect the overall flame retardant performance of the cable. In addition, for thermoplastic materials such as polypropylene, molten drips are produced when burning. If these high-temperature substances fall directly onto the inner wall or bottom of the testing chamber, they are very easy to adhere firmly after cooling. The cleaning process is not only difficult, but may also damage the inner surface of the chamber by scraping with tools.

[0005] In summary, a high-voltage power cable testing device using polypropylene insulation material needs to be developed to solve the above problems. Utility Model Content

[0006] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is: a high-voltage power cable testing device with polypropylene insulation material, comprising: a testing box, a control panel, a top sliding cover, a glass window, and a flame-throwing device installed inside the testing box. A testing mechanism is installed on the inner wall of the testing box, and the testing mechanism further comprises: A rotating component, the rotating component being disposed on the inner wall of the testing chamber, the rotating component including a ventilation plate; A clamping component is disposed on the outer surface of the rotating component, and the clamping component includes a lower arc plate; A collection component, located below the clamping component, includes a positioning frame. The testing chamber provides a sealed and safe space for accommodating cable samples and conducting flame retardant tests. The control panel integrates a touchscreen, start / stop buttons, and a program control unit for setting parameters such as flameout time, flame intensity, and cable rotation speed, and for real-time display of key sensor data such as temperature and insulation resistance, achieving automated and intelligent control of the testing process. The top sliding cover can be opened horizontally for easy installation and adjustment of cable samples from above, ensuring convenient operation. The glass window is made of high-temperature resistant tempered glass, allowing direct observation of the cable's combustion state, flame spread, and molten dripping during testing. The rotating part... The component is used to drive the cable sample to rotate at a constant speed during the test to simulate the scenario of flame attacking from different angles, ensuring a comprehensive evaluation of the circumferential flame-retardant performance of the cable; the ventilation plate is set on the side wall of the test chamber and is equipped with a dustproof net inside, for heat dissipation of heat-generating components such as motors and limited air exchange with the outside; the clamping component is used to clamp the conductor of the cable sample to ensure reliable cable rotation; the lower arc plate serves as the base for cable clamping, and its arc structure better fits the outer diameter of the cable; the collection component is located directly below the cable to collect contaminants such as molten drips and carbonized debris generated during the combustion test, keeping the inside of the chamber clean for subsequent cleaning.

[0007] Furthermore, a motor is installed on one side of the ventilation plate, and a rotating shaft is mounted on the output end of the motor. A support frame is rotatably connected to the outer surface of the rotating shaft. A long connecting plate is mounted on the upper surface of the rotating shaft, and a short connecting plate is mounted on the lower surface of the rotating shaft. The motor, as the power source for the rotating component, is a low-speed, high-torque stepper motor to achieve precise control of the cable rotation speed. The support frame is connected to the rotating shaft via bearings, providing intermediate support for the load mainly composed of the cable's own weight and the clamping components, effectively reducing the radial load on the motor output shaft and preventing excessive deflection under gravity from causing rotational jamming. The long and short connecting plates are used to connect the rotating shaft to the limiting box and the lower arc plate of the clamping components, respectively, forming a stable rotational support frame.

[0008] Furthermore, the ventilation plate is installed on the inner surface of the testing box, and the motor is installed on the inner surface of the testing box.

[0009] Furthermore, the motors are symmetrically arranged on both sides of the flame-spraying device, and the support frame is fixedly connected to the inner surface of the detection box on the side closest to the motor.

[0010] Furthermore, a lower rubber plate is installed in the inner cavity of the lower arc plate, and an upper rubber plate is provided above the lower rubber plate. The upper arc plate is fixed to the outer surface of the upper rubber plate, and a fixing plate is installed on the upper surface of the upper arc plate. A pull ring is fixed to the upper surface of the fixing plate. The lower rubber plate and the upper rubber plate cooperate to press the cable surface using the elastic deformation of the rubber, providing sufficient clamping force while avoiding damage to the cable insulation layer. The upper rubber plate and the lower rubber plate work together to form a flexible cable clamping opening. The upper arc plate serves as the structural base of the upper clamping component. The fixing plate is used to connect the upper arc plate and the upper magnetic block.

[0011] The pull ring provides a point of leverage, making it easy for operators to lift the parts upwards and quickly clamp or remove the cable.

[0012] Furthermore, an upper magnetic block is mounted on the lower surface of the fixing plate, and a limit box is slidably connected to the outer surface of the upper magnetic block. A lower magnetic block is mounted on the inner wall of the limit box. The upper and lower magnetic blocks together constitute a magnetic quick-locking mechanism, which uses strong magnetic attraction to close the upper and lower parts, replacing traditional bolt locking and improving operational efficiency. The limit box serves as a container and fixing base for the lower magnetic block, and its inner wall precisely guides the upper magnetic block and the fixing plate to slide vertically, ensuring alignment accuracy during closing and preventing misalignment.

[0013] Furthermore, the side of the lower arc plate near the rotation axis is fixedly connected to the side of the short connecting plate away from the rotation axis, the outer surface of the fixing plate is slidably connected to the inner surface of the limiting box, and the side of the limiting box near the rotation axis is fixedly connected to the side of the long connecting plate away from the rotation axis.

[0014] Furthermore, a pull-out frame is slidably connected to the outer surface of the positioning frame, a semi-circular ring is installed on the outer side of the pull-out frame, and a sludge collection plate is embedded in the inner surface of the pull-out frame. Through the sliding rail structure design, the pull-out frame can be pulled out from inside the testing box, facilitating waste cleaning; the semi-circular ring serves as a handle for easy operation; the sludge collection plate's bearing surface is made of metal sheet treated with a high-temperature resistant, anti-adhesion ceramic coating, specifically designed to collect molten drips generated during the combustion of polypropylene insulation material, preventing them from adhering to the plate surface and facilitating cleaning.

[0015] Furthermore, the extraction frame has symmetrically arranged ejector holes located below the sludge collection plate. When there is a large amount of solidified waste on the sludge collection plate, a tool such as a wooden stick can be used to gently push it upwards through the ejector holes from below, assisting the sludge collection plate to detach from the extraction frame. This facilitates cleaning of the surface waste and makes subsequent reinstallation and use easier.

[0016] Furthermore, the positioning frame is installed on the inner surface of the testing box, and the number of extraction frames is set to multiple sets. The sludge collection plate is detachably embedded in the extraction frame, and its bearing surface is lower than the upper surface of the extraction frame.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model uses a magnetic quick-clamp structure composed of an upper magnetic block and a lower magnetic block in the clamping component, which works in conjunction with the sliding guide of the limiting box. When clamping a cable, only the pull ring needs to be pulled to insert the cable. After releasing, the magnetic force automatically locks it in place. This solves the problem of cumbersome operation, time-consuming and laborious operation caused by the need to use tools to tighten bolts in traditional clamps, and avoids problems such as uncontrollable clamping force caused by improper use of tools or stripped bolt threads.

[0018] 2. This utility model, through the setting of a rotating component consisting of a motor, rotating shaft, support frame, and long and short connecting plates in the testing mechanism, cooperates with the clamping component to drive the cable sample to rotate uniformly around its axis during the testing process. This solves the limitation of most existing fixed burners that can only burn one side of the cable, and avoids the quality risk of incomplete flame retardant performance evaluation and inability to truly reflect the flame spread characteristics in the circumferential direction of the cable due to a single testing position, which may lead to defective products being misjudged as qualified.

[0019] 3. This utility model, through the setting of a pull-out rack and a sludge collection plate with ceramic coating in the collection component, and its cooperation with the slide rail of the positioning frame, allows the sludge collection component to be pulled out as a whole after the test is completed. This solves the problem that molten drips from thermoplastic materials such as polypropylene fall directly to the bottom of the test chamber and adhere firmly, making them difficult to remove. It also avoids the problem of hardened waste accumulating for a long time and causing corrosion or damage to the inner wall of the chamber, as well as the problem of scratching the surface of the equipment when using sharp tools to scrape and clean.

[0020] 4. This utility model utilizes the combination of an ejector hole in the collection component and a multi-layer extraction rack. The ejector hole allows for easy ejection of the sludge collection plate from the inside when the gap between the plate and the inner surface of the extraction rack is too small. This design also ensures that the sludge collection plate remains stably positioned within the extraction rack during normal pulling, preventing accidental slippage and injury to personnel. Furthermore, the multi-layer extraction rack allows the lower sludge collection plates to be immediately put into operation when the uppermost plate needs cleaning, solving the problem of single-layer designs requiring machine shutdown and waiting for cleaning and installation before the next inspection can proceed. This avoids interruptions and inefficiencies in inspection work. Attached Figure Description

[0021] Figure 1 This is the front view of this utility model; Figure 2 This is a cross-sectional view of the testing box of this utility model; Figure 3 This is a schematic diagram of the structure of the rotating component of this utility model; Figure 4 This is a sectional view of the lower arc plate of this utility model; Figure 5This is a cross-sectional view of the limiting box of this utility model; Figure 6 This is a structural schematic diagram of the positioning frame of this utility model; Figure 7 This is a schematic diagram of the structure of the extraction rack of this utility model.

[0022] In the diagram: 1. Detection box; 2. Control panel; 3. Top sliding cover; 4. Glass window; 5. Detection mechanism; 51. Rotating component; 511. Ventilation plate; 512. Motor; 513. Rotating shaft; 514. Support frame; 515. Long connecting plate; 516. Short connecting plate; 52. Clamping component; 521. Lower arc plate; 522. Lower rubber plate; 523. Upper rubber plate; 524. Upper arc plate; 525. Fixing plate; 526. Pull ring; 527. Upper magnetic block; 528. Limit box; 529. Lower magnetic block; 53. Collection component; 531. Positioning frame; 532. Extraction frame; 533. Semicircular ring; 534. Sludge collection plate; 535. Top outlet; 6. Flame-spraying device. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose. Example 1

[0024] Please see Figure 1 - Figure 5 This utility model provides a technical solution: a high-voltage power cable testing device with polypropylene insulation material, comprising: a testing box 1, a control panel 2, a top sliding cover 3, a glass window 4, a flame-throwing device 6 installed inside the testing box 1, and a testing mechanism 5 installed on the inner wall of the testing box 1. The testing mechanism 5 further comprises: Rotating component 51 is disposed on the inner wall of the detection box 1, and the rotating component 51 includes a ventilation plate 511; Clamping component 52 is disposed on the outer surface of rotating component 51, and clamping component 52 includes a lower arc plate 521; A collection component 53 is located below the clamping component 52 and includes a positioning frame 531. The testing chamber 1 provides a sealed and safe space for accommodating cable samples and conducting flame retardant tests. The control panel 2 integrates a touchscreen, start / stop buttons, and a program control unit for setting parameters such as flame time, flame intensity, and cable rotation speed, and for displaying real-time data from key sensors such as temperature and insulation resistance, achieving automated and intelligent control of the testing process. To enable real-time monitoring of the testing environment, a temperature sensor is integrated into the inner wall of the testing chamber 1 to continuously monitor the approximate temperature of the combustion zone within the chamber. Its signal output is connected to the data processing unit in the control panel 2, with connecting wires embedded in the inner wall of the testing chamber 1. The top sliding cover 3 can slide horizontally open, facilitating the installation and adjustment of cable samples from above, ensuring convenient operation. The glass window 4 is made of high-temperature resistant material. Tempered glass is used to directly observe the burning state, flame spread, and molten dripping of the cable during the test. The rotating component 51 drives the cable sample to rotate at a constant speed during the test to simulate the scenario of flame attacking from different angles, ensuring a comprehensive evaluation of the circumferential flame-retardant performance of the cable. The ventilation plate 511 is set on the side wall of the test chamber 1 and is equipped with a dustproof net inside, which is used for heat dissipation of heat-generating components such as the motor 512 and limited air exchange with the outside. The clamping component 52 is used to clamp the conductor of the cable sample to ensure reliable cable rotation. The lower arc plate 521 serves as the base for clamping the cable, and its arc structure better fits the outer diameter of the cable. The collecting component 53 is located directly below the cable and is used to collect pollutants such as molten drippings and carbonized debris generated during the combustion test, keeping the inside of the chamber clean for subsequent cleaning.

[0025] A motor 512 is installed on one side of the ventilation plate 511. A rotating shaft 513 is installed at the output end of the motor 512. A support frame 514 is rotatably connected to the outer surface of the rotating shaft 513. A long connecting plate 515 is installed on the upper surface of the rotating shaft 513, and a short connecting plate 516 is installed on the lower surface of the rotating shaft 513. The motor 512 serves as the power source for the rotating component 51. A low-speed, high-torque stepper motor 512 is selected to achieve precise control of the cable rotation speed. The support frame 514 is connected to the rotating shaft 513 through bearings, providing intermediate support for the load mainly composed of the cable's own weight and the clamping component 52. This effectively reduces the radial load on the output shaft of the motor 512 and prevents excessive deflection under gravity from causing rotational jamming. The long connecting plate 515 and the short connecting plate 516 are used to connect the rotating shaft 513 to the limiting box 528 and the lower arc plate 521 of the clamping component 52, respectively, forming a stable rotational support frame.

[0026] Ventilation plate 511 is installed on the inner surface of test box 1, and motor 512 is installed on the inner surface of test box 1.

[0027] The motors 512 are symmetrically arranged on both sides of the flame-spraying device 6, and the support frame 514 is fixed to the inner surface of the detection box 1 on the side near the motors 512.

[0028] A lower rubber plate 522 is installed inside the lower arc plate 521. An upper rubber plate 523 is located above the lower rubber plate 522. An upper arc plate 524 is fixed to the outer surface of the upper rubber plate 523. A fixing plate 525 is installed on the upper surface of the upper arc plate 524, and a pull ring 526 is fixed to the upper surface of the fixing plate 525. The lower rubber plate 522 and the upper rubber plate 523 cooperate to press the cable surface using the elastic deformation of the rubber, providing sufficient clamping force while avoiding damage to the cable insulation layer. The upper rubber plate 523 and the lower rubber plate 522 work together to form a flexible cable clamping opening. At the same time, the upper rubber plate 523 and the lower rubber plate 522 are detachable in the inner cavities of the upper arc plate 524 and the lower arc plate 521, respectively. They can be replaced with spare parts of different theoretical inner diameters according to the actual outer diameter of the cable to be tested. This solves the problem of insecure clamping or excessive clamping caused by cable tolerance. This addresses the issue of damaged insulation layers and enhances the versatility of the device. The upper arc plate 524 serves as the structural base for the upper clamping component. The fixing plate 525 connects the upper arc plate 524 and the upper magnetic block 527. Both the upper magnetic block 527 and the lower magnetic block 529 are made of high-temperature resistant permanent magnet material, and their operating temperature can be stably maintained above 350°C. This temperature is much higher than the ambient temperature caused by the flame-spraying device 6 near the cable sample, thus ensuring that the magnetic attraction method can provide a stable and reliable locking force during the entire testing process, avoiding clamping failure caused by high-temperature demagnetization.

[0029] Pull ring 526 provides a force point, making it easy for operators to lift the part upwards and quickly clamp or remove the cable.

[0030] An upper magnetic block 527 is mounted on the lower surface of the fixed plate 525. A limit box 528 is slidably connected to the outer surface of the upper magnetic block 527. A lower magnetic block 529 is mounted on the inner wall of the limit box 528. The upper magnetic block 527 and the lower magnetic block 529 together constitute a magnetic quick-locking mechanism, which uses strong magnetic attraction to close the upper and lower parts, replacing the traditional bolt locking and improving operational efficiency. The limit box 528 serves as the container and fixed base for the lower magnetic block 529. At the same time, its inner wall precisely guides the upper magnetic block 527 and the fixed plate 525 to slide vertically, ensuring the alignment accuracy during closing and avoiding misalignment.

[0031] The side of the lower arc plate 521 near the rotating shaft 513 is fixedly connected to the side of the short connecting plate 516 away from the rotating shaft 513. The outer surface of the fixing plate 525 is slidably connected to the inner surface of the limiting box 528. The side of the limiting box 528 near the rotating shaft 513 is fixedly connected to the side of the long connecting plate 515 away from the rotating shaft 513.

[0032] The working principle is as follows: First, preparations are made before testing. The operator slides the top cover 3 horizontally to expose the installation space inside the testing box 1. Then, the operator manually pulls the pull ring 526 on the upper surface of the fixing plate 525, causing the fixing plate 525, the upper arc plate 524, and the upper rubber plate 523 to slide upward under the guidance of the limiting box 528, overcoming the magnetic attraction between the upper magnetic block 527 and the lower magnetic block 529, so that the upper rubber plate 523 and the lower rubber plate 522 open. The polypropylene insulated high-voltage power cable sample to be tested is placed on the lower rubber plate 522 in the inner cavity of the lower arc plate 521. After releasing the pull ring 526, under the action of strong magnetic force and gravity, the upper magnetic block 527 moves downward quickly, causing the upper rubber plate 523 to press the cable sample, forming a flexible clamping opening together with the lower rubber plate 522. This provides sufficient clamping force to fix the cable, and the elastic deformation of the rubber effectively avoids damage to the cable insulation layer due to excessive clamping force or excessive hardness. This magnetic quick-clamp structure replaces the traditional bolt fastening, improving clamping efficiency.

[0033] Then, set the parameters for this flame retardant test through the control panel 2, including the burning time and flame intensity of the flame-spraying device 6, and the rotation speed (i.e., cable rotation speed) of the motor 512 that drives the rotating part 51. After setting, close the top sliding cover 3 and start the test program.

[0034] After the testing program is started, the control panel 2 sends commands to each executing component. The motor 512 starts working, and its output drives the rotating shaft 513 to rotate at a constant speed. The support frame 514 provides stable radial support for the rotating shaft 513 through internal bearings, effectively distributing the huge load generated by the weight of the cable itself and the clamping component 52. This avoids the problem of excessive shaft deflection, rotational jamming, or even overload damage to the motor 512 that might be caused by all gravity acting directly on the output shaft of the motor 512, thus ensuring the smoothness and reliability of the rotational motion. When the rotating shaft 513 rotates, the lower arc plate 521 and the clamped cable sample rotate synchronously through the short connecting plate 516 installed on its lower surface, and the limit box 528 and the entire upper part rotate synchronously through the long connecting plate 515 installed on its upper surface, thus forming a robust rotating frame and ensuring the overall stability of the cable during rotation.

[0035] Simultaneously, the flame-spraying device 6 is ignited, spraying combustion onto the uniformly rotating cable sample. Operators can observe the cable's combustion status, flame spread rate, and the molten dripping of the polypropylene insulation material through the high-temperature tempered glass window 4 in real time. During this process, the heat generated by the motor 512 is exchanged with the outside environment through the ventilation plate 511 installed on the inner wall of the testing chamber 1. Its internal dustproof mesh prevents large amounts of external dust from entering the chamber, maintaining a healthy internal environment.

[0036] It should be noted that the upper magnetic block 527 and the lower magnetic block 529 have a strong magnetic attraction force, which can overcome the downward tendency caused by gravity when the upper arc plate 524, upper rubber plate 523, and fixing plate 525 rotate around the center to the lowest point. Furthermore, the magnetic attraction force is less than the pulling force of a human hand. Also, the diameter of the cable being detected by this device must be slightly larger than the theoretical inner diameter formed by the combined upper rubber plate 523 and lower rubber plate 522, so that the elastic deformation of both plates can effectively clamp the cable. If the cable diameter is too small, sufficient contact pressure and friction will not be generated, leading to clamping failure. Example 2

[0037] Please see Figure 1 - Figure 7 This utility model provides a technical solution: Based on Embodiment 1, a pull-out frame 532 is slidably connected to the outer surface of the positioning frame 531. A semi-circular ring 533 is installed on the outer side of the pull-out frame 532, and a dirt collection plate 534 is embedded in the inner surface of the pull-out frame 532. Through the slide rail structure design, the pull-out frame 532 can be pulled out from inside the detection box 1, which facilitates the cleaning of waste materials; the semi-circular ring 533 serves as a handle for pulling out, making it easy to operate; the dirt collection plate 534 has a metal substrate, and its bearing surface is made of metal plate treated with high temperature resistance and anti-adhesion ceramic coating, which is specially used to receive molten drips generated when polypropylene insulation material is burned, preventing them from adhering to the plate surface and facilitating cleaning. This type of coating has excellent high-temperature resistance and can remain stable at high temperatures. Its temperature resistance can usually reach 600℃-1000℃ or more, which can fully withstand the temperature of the molten drips produced when polypropylene insulation material is burning. In addition, the ceramic coating has good anti-stick properties, is wear-resistant, scratch-resistant, and has a long service life. The temperature of the molten drips produced when polypropylene insulation material is burning is usually between 160℃-300℃, and its decomposition temperature is also below 400℃. That is, the temperature of the molten material produced by the burning cable is far below the tolerance limit of the ceramic coating.

[0038] The extraction rack 532 is located below the sludge collection plate 534 and has ejection holes 535, which are symmetrically arranged. When there is a lot of solidified waste on the sludge collection plate 534, a tool such as a wooden stick can be used from below to gently push it upward through the ejection holes 535 to help the sludge collection plate 534 detach from the extraction rack 532, making it easier to clean the waste on the surface and facilitate subsequent reinstallation and use.

[0039] The positioning frame 531 is installed on the inner surface of the test box 1. The number of extraction frames 532 is set in multiple sets. The sludge collection plate 534 is detachably embedded in the extraction frame 532, and its bearing surface is lower than the upper surface of the extraction frame 532.

[0040] The working principle is as follows: During the combustion test, contaminants such as molten drips and carbonized debris generated by the high-temperature burning of the cable's polypropylene insulation layer fall downwards under gravity and are ultimately caught by the collection plate 534 located directly below the clamping component 52. The collection plate 534, with its high-temperature resistant and anti-adhesion ceramic coating on its bearing surface, effectively prevents the molten material from adhering firmly to its surface after cooling, facilitating subsequent cleaning.

[0041] Finally, when the set burning time ends, the control panel 2 automatically controls the flame-emitting device 6 to shut off, and the motor 512 stops rotating. After the temperature inside the testing chamber 1 drops to a safe range, the operator can reopen the top sliding cover 3. Similarly, by manually pulling the pull ring 526 on the upper surface of the fixing plate 525, the fixing plate 525, the upper arc plate 524, and the upper rubber plate 523 slide upwards under the guidance of the limit box 528, overcoming the magnetic attraction between the upper magnetic block 527 and the lower magnetic block 529, causing the upper rubber plate 523 and the lower rubber plate 522 to open. The polypropylene insulated high-voltage power cable sample, after testing, can then be removed from the rubber plate.

[0042] Since some molten material falls onto the surface of the collection plate 534, to prevent the waste on the collection plate 534 from continuously increasing and affecting subsequent cleaning, the collection plate 534 needs to be disassembled and cleaned regularly. At this time, the staff can hold the handle of the semi-circular ring 533 and smoothly pull the first-layer extraction rack 532 out of the detection box 1 along the slide rail on the positioning frame 531. Since the collection plate 534 is installed in the extraction rack 532 in an embedded manner, and its bearing surface is designed to be lower than the upper surface of the extraction rack 532, this height difference forms a natural safety gap. That is, during the extraction process, the highest point of the solidified waste collected on the collection plate 534 is always lower than the edge of the upper surface of the extraction rack 532, thus completely avoiding the problem of scratching or interference with the opening and inner wall of the detection box 1, and realizing smooth and unobstructed removal. If any solidified material occasionally adheres to the surface of the collection plate 534, making it difficult to clean, or if the collection plate 534 is damaged, the collection plate 534 can be removed from the inner wall of the extraction frame 532. To avoid difficulty in disassembly due to a small gap between the collection plate 534 and the extraction frame 532, the collection plate 534 can be separated from the extraction frame 532 by gently pushing upwards from below using a tool such as a wooden stick through the symmetrically provided ejection holes 535 at the bottom of the extraction frame 532. This facilitates the removal of the collection plate 534 for cleaning or... The replacement solves the problem of difficult cleaning caused by the adhesion and hardening of molten material in traditional flame retardant testing equipment. Since the extraction rack 532 is set with multiple layers, when the top extraction rack 532 and the collection plate 534 are extracted, there will be an auxiliary extraction rack 532 below to continue the collection work. This saves time and makes it easier to clean the disassembled collection plate 534. It avoids the problem of having to wait for the collection plate 534 to be cleaned before installation and restarting the machine for cable testing.

[0043] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A polypropylene insulated high voltage power cable detection apparatus comprising: The test chamber (1), control panel (2), top sliding cover (3), glass window (4), and flame-throwing device (6) installed inside the test chamber (1) are characterized in that: a test mechanism (5) is installed on the inner wall of the test chamber (1), and the test mechanism (5) further comprises: Rotating component (51), the rotating component (51) is disposed on the inner wall of the detection box (1), the rotating component (51) includes a ventilation plate (511). A clamping component (52) is provided on the outer surface of the rotating component (51), and the clamping component (52) includes a lower arc plate (521). A collecting component (53) is located below the clamping component (52), and the collecting component (53) includes a positioning frame (531).

2. The polypropylene insulated high voltage power cable detection apparatus according to claim 1, characterized in that: A motor (512) is provided on one side of the ventilation plate (511). A rotating shaft (513) is installed at the output end of the motor (512). A support frame (514) is rotatably connected to the outer surface of the rotating shaft (513). A long connecting plate (515) is installed on the upper surface of the rotating shaft (513), and a short connecting plate (516) is installed on the lower surface of the rotating shaft (513).

3. The polypropylene insulated high voltage power cable detection apparatus according to claim 2, characterized in that: The ventilation plate (511) is installed on the inner surface of the test box (1), and the motor (512) is installed on the inner surface of the test box (1).

4. The polypropylene insulated high voltage power cable detection apparatus according to claim 3, characterized in that: The motor (512) is symmetrically arranged on both sides of the flame-spraying device (6), and the support frame (514) is fixed to the inner surface of the detection box (1) on the side near the motor (512).

5. The polypropylene insulated high voltage power cable detection apparatus of claim 1, wherein: A lower rubber plate (522) is installed in the inner cavity of the lower arc plate (521). An upper rubber plate (523) is provided above the lower rubber plate (522). An upper arc plate (524) is fixed to the outer surface of the upper rubber plate (523). A fixing plate (525) is installed on the upper surface of the upper arc plate (524). A pull ring (526) is fixed to the upper surface of the fixing plate (525).

6. The polypropylene insulated high voltage power cable detection apparatus according to claim 5, characterized in that: An upper magnetic block (527) is installed on the lower surface of the fixing plate (525), and a limit box (528) is slidably connected to the outer surface of the upper magnetic block (527). A lower magnetic block (529) is installed on the inner wall of the limit box (528).

7. The polypropylene insulated high voltage power cable detection apparatus according to claim 6, characterized in that: The lower arc plate (521) is fixedly connected to the side of the short connecting plate (516) away from the rotating shaft (513) on the side near the rotating shaft (513). The outer surface of the fixed plate (525) is slidably connected to the inner surface of the limiting box (528). The side of the limiting box (528) near the rotating shaft (513) is fixedly connected to the side of the long connecting plate (515) away from the rotating shaft (513).

8. The polypropylene insulated high voltage power cable detection apparatus of claim 1, wherein: The outer surface of the positioning frame (531) is slidably connected to the extraction frame (532), a semi-circular ring (533) is installed on the outer side of the extraction frame (532), and a dirt collection plate (534) is embedded in the inner surface of the extraction frame (532).

9. The polypropylene insulated high voltage power cable detection apparatus according to claim 8, characterized in that: The extraction rack (532) is located below the sludge collection plate (534) and has an ejection hole (535) which is symmetrically arranged.

10. The polypropylene insulated high voltage power cable detection apparatus of claim 9, wherein: The positioning frame (531) is installed on the inner surface of the detection box (1). The number of extraction frames (532) is set in multiple sets. The sludge collection plate (534) is detachably embedded in the extraction frame (532), and its bearing surface is lower than the upper surface of the extraction frame (532).

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