A cable thermal stretching test oven

Abstract

This utility model relates to a cable thermal elongation test oven, belonging to the field of cable testing technology. The cable thermal elongation test oven includes: a base, a test chamber, a hot air duct, a three-way pipe, a three-way valve, a support, a suspension assembly, a cable body, and a gravity assembly. The gravity assembly is located below the cable body to enhance its elongation effect. One end of the hot air duct is equipped with a high-efficiency heating element and a circulating fan. The three-way pipe enables shared hot air between the two chambers. The three-way valve precisely controls the distribution of hot air flow, making the temperature difference between the two test chambers controllable. The suspension assembly achieves horizontal sliding positioning via a linear guide rail. The gravity assembly adopts a modular weight design, and the force application height is adjusted through a precision screw mechanism to ensure a standard constant load is applied to the cable body. The three-way valve controls the three-way pipe, allowing for inconsistent temperatures in the two test chambers. Simultaneous testing of one or more cable bodies is possible, greatly improving testing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of cable testing technology, and in particular to a cable thermal stretching test oven. Background Technology

[0002] The main component of power cable insulation material is cross-linked polyethylene (XLPE). XLPE, with its excellent electrical properties, processing performance, stable chemical properties, low dielectric loss, and non-toxicity, has become a key choice for power cable insulation materials since its introduction. The thermal elongation test of cable insulation is a mandatory inspection item in cable quality testing, directly related to the weather resistance and safety of power cables. The thermal elongation test measures the elongation and permanent deformation rate of the cross-linked cable insulation and sheath materials under heat and load to determine the material properties or test the degree of cross-linking. The three essential elements of this test are temperature, load, and time; none can be omitted.

[0003] The accuracy of existing testing devices is determined by the traditional ruler and weight test setup. During use, since the testing device generally only has one testing chamber with a uniform temperature, it can only test one type of cable at a time, resulting in long waiting times and low efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a cable thermal stretching test oven to address the problem that testing devices generally only have one testing chamber with a uniform temperature, which means that only one type of cable can be tested at a time, resulting in excessively long waiting times and low efficiency.

[0005] A cable thermal stretching test oven includes: a base, two test chambers on one side of the base, hot air pipes fixedly connected to the top of each of the two test chambers, a three-way pipe fixedly connected to one end of each of the two hot air pipes, and a three-way valve in the middle of the three-way pipe;

[0006] The bracket is provided in two, and the two brackets are respectively located on the inner walls of the two test chambers. Multiple suspension components are slidably provided on the surface of each of the two brackets, and a cable body is provided below each of the multiple suspension components.

[0007] A gravity component is located inside the test chamber and below the cable body to increase the extension effect of the cable body.

[0008] In one embodiment, the outlet ends of both hot air pipes are located directly above the test chamber, and the other ends of the two hot air pipes are connected to the hot air blower through the tee pipe.

[0009] In one embodiment, each of the two test chambers is movably connected to a door panel on one side, the two door panels rotate in opposite directions, and an observation plate is fixedly provided on the surface of each of the two door panels.

[0010] In one embodiment, the suspension assembly includes a hanging plate that slides on the surface of the bracket, a hanging plate that is horizontally and movably inserted below the hanging plate, and two first clamping plates that are slidably sleeved on the surface of the hanging plate, with the sides of the two first clamping plates close to each other abutting against the two side surfaces of one end of the cable body.

[0011] In one embodiment, a slide rail is fixedly connected to one side of the bracket, and the lower side of the hanging plate is embedded in the slide rail and slides along the surface of the bracket.

[0012] In one embodiment, the gravity component includes second clamps on both sides of the other end of the cable body, hooks are slidably inserted under the two second clamps, and gravity blocks are movably connected to the surface of the hooks.

[0013] In one embodiment, each of the two first clamping plates and the two second clamping plates has a threaded rod threaded into its interior, and the two ends of the threaded rod are threaded with nuts.

[0014] In one embodiment, anti-slip plates are fixedly connected to the sides of the two first clamping plates and the two second clamping plates that are close to each other, and the plurality of anti-slip plates are stepped and are attached to the surfaces of both ends of the cable body. Beneficial effects

[0015] 1. The base is equipped with adjustable feet to ensure the equipment is placed horizontally. The side of the base integrates an intelligent control panel, which can display and adjust parameters such as temperature and time in real time. One end of the hot air duct is equipped with a high-efficiency heating element and a circulating fan. The hot air is shared between the two chambers through a three-way pipe. The three-way valve can precisely control the distribution of hot air flow, making the temperature difference between the two test chambers controllable. The suspension assembly achieves horizontal sliding positioning through linear guide rails. Each assembly is equipped with a force sensor to monitor the tension on the cable in real time. The gravity assembly adopts a modular weight design, and the force application height is adjusted through a precision screw mechanism to ensure that a standard constant load is applied to the cable body. It is suitable for testing the thermal elongation performance of materials such as cross-linked polyethylene and ethylene propylene rubber. The three-way valve can control the temperature of the two test chambers to be different, and one or more cable bodies can be tested simultaneously, which greatly improves the testing efficiency.

[0016] 2. The suspension assembly's hanging plate is made of aerospace-grade aluminum in one piece, with a hard anodized surface that is corrosion-resistant and wear-resistant. The hanging plate and the mounting plate are connected by a dovetail groove structure, and a stainless steel spring pin is used to achieve quick positioning. The stainless steel spring pin is a relatively mature product in existing technology, and the appropriate model can be selected according to actual needs. It will not be elaborated here. It ensures that the hanging plate does not wobble in the horizontal direction. The inner sides of the two first clamping plates are embedded with high-temperature resistant silicone pads, and the surface is designed with a diamond-shaped anti-slip texture. This not only avoids crushing the cable body during clamping, but also prevents the sample from slipping by increasing friction. The slide rail adopts a precision linear guide pair with a built-in ball circulation system, which reduces the sliding resistance of the hanging plate. With the help of stainless steel locking screws, the position can be adjusted to meet the testing needs of different specifications of materials. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the hot air duct structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the test chamber of this utility model;

[0021] Figure 4 This is a schematic diagram of the suspension component structure of this utility model;

[0022] Figure 5 This is an enlarged view of the gravity component structure of this utility model.

[0023] Figure label:

[0024] 100. Base; 200. Test chamber; 201. Door panel; 202. Observation panel; 300. Hot air duct; 301. T-pipe; 302. T-valve; 400. Bracket; 401. Slide rail; 500. Suspension assembly; 501. Hanging plate; 502. Hanging plate; 503. First clamping plate; 504. Threaded rod; 600. Cable body; 700. Gravity assembly; 701. Second clamping plate; 702. Hook; 703. Gravity block; 704. Anti-slip plate. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] The following is combined Figure 1 - Figure 5 This invention describes a cable thermal stretching test oven.

[0027] In one embodiment, a cable thermal elongation test oven includes: a base 100, a support 400, and a gravity component 700. Two test chambers 200 are provided on one side of the base 100. Hot air pipes 300 are fixedly connected to the top of each of the two test chambers 200. A three-way pipe 301 is fixedly connected to one end of each of the two hot air pipes 300. A three-way valve 302 is provided in the middle of the three-way pipe 301. Two supports 400 are provided. The two supports 400 are respectively provided on the inner walls of the two test chambers 200. Multiple suspension components 500 are slidably provided on the surface of each of the two supports 400. A cable body 600 is provided below each of the multiple suspension components 500. The gravity component 700 is located inside the test chamber 200 and below the cable body 600 to increase the elongation effect of the cable body 600.

[0028] In this embodiment, the base 100 adopts a high-strength alloy frame and is equipped with adjustable feet at the bottom to ensure that the equipment is placed horizontally. The base 100 integrates an intelligent control panel on the side, which can display and adjust parameters such as temperature and time in real time. The inner wall of the test chamber 200 is made of mirror stainless steel, which is smooth and easy to clean, ensuring no heat leakage in high-temperature environments.

[0029] One end of the hot air duct 300 is equipped with a high-efficiency heating element and a circulating fan. The hot air is shared between the two chambers through the three-way pipe 301. The three-way valve 302 can precisely control the distribution of hot air flow, making the temperature difference between the two test chambers 200 controllable. The bracket 400 is an aluminum alloy profile structure with an anodized surface. The suspension component 500 achieves horizontal sliding positioning through a linear guide rail. Each component is equipped with a force sensor to monitor the tension on the cable in real time. The gravity component 700 adopts a modular weight design and adjusts the force application height through a precision screw mechanism to ensure that a standard constant load is applied to the cable body 600. It is suitable for testing the thermal elongation performance of materials such as cross-linked polyethylene and ethylene propylene rubber.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, the outlet ends of the two hot air pipes 300 are located directly above the test chamber 200. The other ends of the two hot air pipes 300 are connected to the hot air blower through the three-way pipe 301. A door panel 201 is movably connected to one side of the two test chambers 200. The two door panels 201 rotate in opposite directions. An observation plate 202 is fixedly provided on the surface of the two door panels 201.

[0031] In this embodiment, the outlet ends of the two hot air ducts 300 are precisely positioned in the center area of ​​the top of the test chamber 200, ensuring that the hot air is distributed vertically downwards. Combined with the mirrored stainless steel reflective layer on the inner wall of the test chamber 200, a 360° annular heat convection is formed, effectively eliminating temperature dead zones. The outer wall of the hot air ducts 300 is wrapped with an aluminum silicate fiber cotton insulation layer, which reduces heat loss and lowers the surface temperature of the equipment, improving operational safety. The connection between the three-way pipe 301 and the hot air blower adopts a flange-type sealing structure and is equipped with a high-temperature resistant silicone gasket to ensure no leakage in a vacuum environment. The three-way valve 302 is driven by a stepper motor, which can realize stepless flow adjustment, making the temperature difference control of the dual test chambers 200 more precise.

[0032] The test chamber 200 door panel 201 adopts a double-opening design, with the left and right chamber doors 201 rotating 180° in opposite directions to avoid interference when opened simultaneously. The door frame is embedded with double silicone sealing strips, which, together with the eagle beak-type interlocking structure of the door lock mechanism, form an airtight protection. The observation panel 202 is made of thick quartz glass, which is temperature resistant and has high light transmittance. The surface is coated with an anti-condensation coating, so the condition of the sample can be clearly observed even in high temperature and high humidity environments. The door panel 201 is filled with ceramic fiber cotton, and the outer panel is made of powder-coated steel plate, which not only ensures heat insulation performance but also enhances the overall aesthetics of the equipment. The ergonomic door handle design facilitates single-person operation.

[0033] like Figure 2 , Figure 3 and Figure 4 As shown, the suspension assembly 500 includes a hanging plate 501 that slides on the surface of the bracket 400. A hanging plate 502 is horizontally and movably inserted below the hanging plate 501. Two first clamping plates 503 are slidably sleeved on the surface of the hanging plate 502. The side of the two first clamping plates 503 that are close to each other is in contact with the two sides of one end of the cable body 600. A slide rail 401 is fixedly connected to one side of the bracket 400. The lower side of the hanging plate 501 is embedded in the slide rail 401 and slides along the surface of the bracket 400.

[0034] In this embodiment, the suspension plate 501 of the suspension assembly 500 is integrally formed from aviation aluminum material, and the surface is treated with hard anodizing, which makes it corrosion-resistant and wear-resistant. The hanging plate 502 is inserted into the hanging plate 501 through a dovetail groove structure, and a stainless steel spring pin is used to achieve rapid positioning. The stainless steel spring pin is a relatively mature product in the prior art, and a suitable model can be selected according to actual needs, which will not be described in detail here. This ensures that the hanging plate 502 does not wobble in the horizontal direction. The inner sides of the two first clamping plates 503 are embedded with high-temperature resistant silicone pads, and the surface is designed with diamond anti-slip texture. This not only avoids crushing the cable body 600 during clamping, but also prevents the sample from slipping by increasing friction. The slide rail 401 adopts a precision linear guide pair with a built-in ball circulation system, which reduces the sliding resistance of the hanging plate 501. With the help of stainless steel locking screws, the position can be adjusted to meet the testing needs of different specifications of materials.

[0035] like Figure 2 , Figure 4 and Figure 5 As shown, the gravity component 700 includes second clamping plates 701 located on both sides of the other end of the cable body 600. Hooks 702 are slidably inserted under the two second clamping plates 701. Gravity blocks 703 are movably connected to the surface of the hooks 702. Threaded rods 504 are threaded into the interior of the two first clamping plates 503 and the two second clamping plates 701 respectively. Nuts are threaded into both ends of the threaded rods 504. Anti-slip plates 704 are fixedly connected to the sides of the two first clamping plates 503 and the two second clamping plates 701 that are close to each other. The multiple anti-slip plates 704 are stepped and fit against the surfaces of both ends of the cable body 600.

[0036] In this embodiment, the second clamping plate 701 of the gravity component 700 is made of stainless steel and the surface is polished to reduce frictional resistance with the cable. The two second clamping plates 701 are slidably connected to the hook 702 through built-in linear bearings to ensure that the gravity block 703 is subjected to vertical force without deviation when loaded. The gravity block 703 adopts a modular weight design and is nickel-plated for rust prevention. Each set of weights is equipped with a unique number for easy quality traceability. A safety lock is provided at the connection between the hook 702 and the second clamping plate 701 to prevent the gravity block 703 from accidentally falling off during the test.

[0037] The threaded rod 504 uses coarse threads and is equipped with anti-loosening nuts at both ends. The bidirectional preload ensures that the clamping force of the first clamping plate 503 and the second clamping plate 701 on the cable body 600 is evenly distributed. The stepped structure design of the anti-slip plate 704 can be adapted to the range of cable diameters. The surface is coated with ceramic particles to effectively prevent sample slippage. The test chamber 200 is equipped with a safety interlock device that automatically cuts off the fan power when the door of the test chamber 200 is opened to prevent accidents caused by misoperation.

[0038] Working principle: The adjustable support legs ensure the base 100 is level. The two ends of the cable sample are clamped between the suspension component 500 and the gravity component 700 respectively. The threaded rod 504 is rotated to make the stepped anti-slip plate 704 evenly press the sample to prevent slippage damage. After the door panel 201 is closed, the intelligent control panel starts the hot air fan. The high temperature airflow is distributed to the two hot air pipes 300 through the three-way pipe 301. The airflow forms a ring-shaped thermal convection in the test chamber 200 through the vertical down-blowing outlet. The mirror stainless steel reflective layer helps to achieve temperature uniformity.

[0039] The suspension assembly 500 slides along the slide rail 401 to the preset position. During the test, the quartz glass observation plate 202, together with the anti-condensation coating, ensures full visibility. When the temperature rises back to the set value, it is maintained for 10 minutes, and the change in the spacing between the marker lines is recorded. The equipment uses technologies such as gravity block 703 numbering and tracing, bidirectional pre-tightening clamping, and stepper motor driving three-way valve 302 to achieve accurate testing of the thermal elongation properties of materials such as cross-linked polyethylene. The data automatically generates a curve report that meets the specifications.

[0040] It should be noted that the base 100 and the three-way valve 302 mentioned above are all devices with relatively mature existing technology. The specific model can be selected according to actual needs. At the same time, the base 100 and the three-way valve 302 can be powered by the built-in power supply or by the mains power. The specific power supply method should be selected according to the situation, and will not be elaborated here.

[0041] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cable thermal stretching test oven, characterized in that, include: A base (100) is provided with two test chambers (200) on one side of the base (100). A hot air pipe (300) is fixedly connected above each of the two test chambers (200). A three-way pipe (301) is fixedly connected to one end of each of the two hot air pipes (300). A three-way valve (302) is provided in the middle of the three-way pipe (301). The bracket (400) is provided in two, and the two brackets (400) are respectively provided on the inner walls of the two test chambers (200). Multiple suspension components (500) are slidably provided on the surface of the two brackets (400), and a cable body (600) is provided below the multiple suspension components (500). A gravity component (700) is located inside the test chamber (200) and below the cable body (600) to increase the extension effect of the cable body (600).

2. The cable thermal elongation test oven according to claim 1, characterized in that, The outlet ends of the two hot air pipes (300) are located directly above the test chamber (200), and the other ends of the two hot air pipes (300) are connected to the hot air blower through the three-way pipe (301).

3. The cable thermal elongation test oven according to claim 2, characterized in that, Each of the two test chambers (200) has a door panel (201) movably connected to one side. The two door panels (201) rotate in opposite directions, and an observation plate (202) is fixedly provided on the surface of each of the two door panels (201).

4. The cable thermal elongation test oven according to claim 1, characterized in that, The suspension assembly (500) includes a hanging plate (501) that slides on the surface of the bracket (400). A hanging plate (502) is horizontally and movably inserted below the hanging plate (501). Two first clamping plates (503) are slidably sleeved on the surface of the hanging plate (502). The side of the two first clamping plates (503) that are close to each other is in contact with the two sides of one end of the cable body (600).

5. The cable thermal elongation test oven according to claim 4, characterized in that, A slide rail (401) is fixedly connected to one side of the bracket (400), and the lower side of the hanging plate (501) is embedded in the slide rail (401) and slides along the surface of the bracket (400).

6. The cable thermal elongation test oven according to claim 5, characterized in that, The gravity component (700) includes second clamps (701) on both sides of the other end of the cable body (600), and hooks (702) are slidably inserted under the two second clamps (701), and gravity blocks (703) are movably connected to the surface of the hooks (702).

7. The cable thermal elongation test oven according to claim 6, characterized in that, The two first clamping plates (503) and the two second clamping plates (701) are each threaded with a threaded rod (504), and the two ends of the threaded rod (504) are threaded with nuts.

8. The cable thermal elongation test oven according to claim 7, characterized in that, Anti-slip plates (704) are fixedly connected to the two first clamping plates (503) and the two second clamping plates (701) on their adjacent sides. The multiple anti-slip plates (704) are stepped and are attached to the two end surfaces of the cable body (600).

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