Cross-linked polyethylene insulation thermal shrinkage test support

Abstract

The utility model provides a crosslinked polyethylene insulation thermal shrinkage test support which comprises a pair of V-shaped side plates and a handheld support, the V-shaped side plates are oppositely arranged, and the two ends of the V-shaped side plates are symmetrically connected through the handheld support; each V-shaped side plate comprises convex flanges at the two ends and V-shaped clamping grooves uniformly arranged in the middle, different samples are erected on the V-shaped clamping grooves of the opposite V-shaped side plates, conductors are arranged inside the samples, wrapped insulators are arranged outside the samples, the conductors at the two ends of the samples are respectively erected and clamped in the V-shaped clamping grooves, and the conductors at the two ends of the samples are respectively clamped in the V-shaped clamping grooves. The insulator at the middle section of the sample is arranged between the two V-shaped side plates. In the application, the structure is simple, the portable bracket is convenient to move, the synchronous test operation of a plurality of samples is carried out to the greatest extent by utilizing a plurality of V-shaped clamping groove structures of the V-shaped side plates, and the efficiency of the thermal shrinkage test is improved.

Description

Technical Field

[0001] This utility model relates to the field of cable testing equipment, and in particular to a cross-linked polyethylene insulation heat shrinkage test bracket. Background Technology

[0002] Substandard heat shrinkage of cables can lead to exposed conductors, increasing the risk of leakage and electric shock. Therefore, ensuring that the heat shrinkage performance of silane-crosslinked polyethylene insulated power cables meets relevant product requirements is essential. However, heat shrinkage testing is a type test, which is characterized by a long testing period and lacks standardized support requirements.

[0003] The corresponding test standard GB / T 2951.13 specifies the procedure for the heat shrinkage test: the sample ( Figure 3 The exposed ends of the conductor are horizontally mounted in an air oven or laid flat on the surface of a talc powder trough, allowing the insulation to expand and contract freely. The samples are heated to the temperature and time specified in the relevant cable product standards. This method is used to evaluate the shrinkage rate of the insulation and sheath under high temperatures. However, the talc powder heating time is relatively long, and talc powder can easily spill onto the samples, the test bench, and inside the test chamber, polluting the environment. Currently, there is no suitable equipment available on the market. Utility Model Content

[0004] The purpose of this utility model is to provide a cross-linked polyethylene insulation heat shrinkage test bracket. The design and gradual improvement of the insulation heat shrinkage test bracket for silane cross-linked polyethylene insulated cables can reduce environmental pollution and improve the efficiency of heat shrinkage testing, making the test a routine and controllable "sampling test", thus better safeguarding the quality of cables.

[0005] To achieve the above objectives, this utility model proposes a cross-linked polyethylene insulation heat shrinkage test bracket, comprising V-shaped side plates and a carrying bracket. A pair of V-shaped side plates are arranged opposite each other, and their two ends are symmetrically connected by the carrying bracket. Each V-shaped side plate includes convex edges at both ends and V-shaped slots evenly arranged in the middle. Different samples are placed on the V-shaped slots of the opposite V-shaped side plates. The interior of each sample is a conductor, and the exterior is an insulator. The conductors at both ends of the sample are respectively held in the V-shaped slots, and the insulator in the middle section of the sample is placed between the two V-shaped side plates.

[0006] Furthermore, in the cross-linked polyethylene insulation heat shrink test bracket, the bottom end of the V-shaped side plate is provided with a support foot.

[0007] Furthermore, in the cross-linked polyethylene insulation heat shrink test bracket, the support foot is a bent base plate perpendicular to the V-shaped side plate.

[0008] Furthermore, in the cross-linked polyethylene insulation heat shrink test bracket, the side of the convex stop that connects with the V-shaped groove is inclined inward.

[0009] Furthermore, in the cross-linked polyethylene insulation heat shrink test bracket, the handle bracket consists of at least one set of horizontally arranged connecting rods.

[0010] Furthermore, in the cross-linked polyethylene insulation heat shrink test bracket, both ends of the handle bracket are bolted to the V-shaped side plate at the connection joint.

[0011] Furthermore, in the cross-linked polyethylene insulation heat shrink test bracket, the two ends of the handle bracket are welded to the V-shaped side plate at the connection joint.

[0012] Furthermore, in the cross-linked polyethylene insulation heat shrink test bracket, the connecting rod has a length of 250 mm and a diameter of 5 mm.

[0013] Furthermore, in the cross-linked polyethylene insulation heat shrink test bracket, the opening of the V-shaped groove is 15mm, the spacing is 15mm, and the height difference between the bottom end of the V-shaped groove and the top end of the convex edge is 25mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are mainly reflected in: simple structure, easy to move by the hand-held bracket, and the use of multiple V-shaped slot structures of the V-shaped side plate to maximize the synchronous testing of multiple samples, thereby improving the efficiency of heat shrinkage testing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-linked polyethylene insulation heat shrinkage test bracket of this utility model;

[0016] Figure 2 This is a schematic diagram of the V-shaped side plate in this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the sample in this utility model;

[0018] Figure 4 This is a comparative distribution diagram of various improved schemes for the cross-linked polyethylene insulation heat shrinkage test bracket in this utility model;

[0019] Figure 5 This is a ratio distribution diagram of various improved schemes of the cross-linked polyethylene insulation heat shrinkage test bracket in this utility model. Detailed Implementation

[0020] The cross-linked polyethylene insulation heat shrink test bracket of this utility model will be described in more detail below with reference to the schematic diagram, which illustrates the preferred embodiment of this utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving the advantageous effects of this utility model. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit this utility model.

[0021] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0024] like Figures 1 to 3 As shown, this utility model proposes a cross-linked polyethylene insulation heat shrinkage test bracket, including a V-shaped side plate 1 and a handle bracket 2. A pair of V-shaped side plates 1 are arranged opposite each other, and their two ends are symmetrically connected by the handle bracket 2. The V-shaped side plate 1 includes convex baffles 11 at both ends and V-shaped slots 12 evenly arranged in the middle. Different samples 3 are placed on the V-shaped slots 12 of the opposite V-shaped side plates 1. The interior of the sample 3 is a conductor 31, and the exterior is an insulator 32. The conductors 31 at both ends of the sample 3 are respectively held in the V-shaped slots 12 of the opposite V-shaped side plates 1. The insulator 32 in the middle section of the sample 3 is placed between the two V-shaped side plates 1.

[0025] Furthermore, such as Figures 1 to 2 As shown, the bottom end of the V-shaped side plate 1 is provided with a support foot, which is a bent bottom plate 13 perpendicular to the V-shaped side plate 1, which facilitates vertical support.

[0026] Furthermore, such as Figure 2 As shown, the side of the convex edge 11 that connects with the V-shaped groove 12 is inclined inward to effectively block the movement and prevent the sample 3 from sliding outward to the convex edge 11 during movement.

[0027] Furthermore, such as Figure 1 As shown, the carrying bracket 2 consists of at least one set of horizontally arranged connecting rods. In this embodiment, two sets of horizontally arranged connecting rods are provided, meaning that each connecting rod is parallel to each other both front and back and vertically, used to support the V-shaped side plates 1 on both sides, and to facilitate the placement and removal of the sample 3 from the aging chamber. Simultaneously, both ends of the carrying bracket 2 are bolted / welded to the V-shaped side plates 1 at the connection joint 14. Preferably, as... Figure 3 As shown, the connecting rod is 250mm long and 5mm in diameter, and is welded to the V-shaped side plate 1.

[0028] Furthermore, such as Figure 2 As shown, the V-shaped side plate 1 is composed of stainless steel plate and has a total of 17 V-shaped slots 12. The opening of the V-shaped slot 12 is 15mm and the spacing is 15mm. The height difference between the bottom of the V-shaped slot 12 and the top of the convex side 11 is 25mm. The width of the bent bottom plate 13 is 10mm.

[0029] The specific operational details are as follows:

[0030] (1) Sampling: Cut a sample about 1.5Lmm long from each insulated core at least 0.5m away from the cable end. L should be the length specified in the relevant cable product standard;

[0031] (2) Sample preparation: All sheaths should be removed from the insulated core sample in a timely manner. Within 5 minutes after cutting the sample, mark the test length L±5mm in the middle of each insulated core sample and measure the distance between the marks to an accuracy of 0.5mm. Then remove the insulation at 2 to 5mm from the marks at both ends of each sample.

[0032] (3) Place the various types of samples 3 on the cross-linked polyethylene insulation heat shrink test bracket, so that the exposed ends of the conductors 31 at both ends of the sample 3 are respectively clamped in the corresponding V-shaped slots 12, and the insulator 32 in the middle section of the sample 3 is suspended between the two V-shaped side plates 1.

[0033] (4) Adjust the temperature of the test chamber. After the test temperature of the aging chamber reaches 200℃, quickly and horizontally place the cross-linked polyethylene insulation heat shrink test bracket with each sample 3 placed on it into the effective temperature zone of the aging chamber through the handle bracket 2. Close the chamber door and start timing. Continuous temperature: 200℃±3℃, duration: 1h.

[0034] (5) After the specified time, remove the support and each sample 3 together from the test chamber and cool them in the air;

[0035] (6) After the sample 3 has cooled to room temperature, remeasure the distance between the marks of each sample 3, that is, the percentage of the difference between the mark distance L1 before heating and the mark distance L2 after heating to the distance between the marks before heating.

[0036] (7) Judgment: If the percentage of the difference between the mark distance L1 before heating and the mark distance L2 after heating to the distance between the marks before heating is ≤4%, it is considered qualified.

[0037] This application designs a test stand for the insulation heat shrinkage of silane cross-linked polyethylene insulated cables, reducing environmental pollution. The sample does not contain freely elongating talc powder adhering to it, thus reducing environmental pollution. Figures 4 to 5 As shown, the efficiency of heat shrink testing has been improved. Specifically, by upgrading to the third-generation heat shrink testing bracket device, the waiting time for multiple silane cross-linked insulation samples to queue for heat shrink testing has been significantly shortened. The efficiency comparison of the improved heat shrink testing horizontal bracket scheme is shown in the table below:

[0038]

[0039] In summary, the cross-linked polyethylene insulation heat shrinkage test bracket proposed in this embodiment has a simple structure, is easy to move with a hand-held bracket, and utilizes multiple V-shaped slot structures on the V-shaped side plate to maximize the simultaneous testing of multiple samples, thereby improving the efficiency of the heat shrinkage test.

[0040] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A cross-linked polyethylene insulation heat shrinkage test bracket, characterized in that, The device includes a V-shaped side plate (1) and a carrying bracket (2). A pair of V-shaped side plates (1) are arranged opposite each other and are symmetrically connected at both ends by the carrying bracket (2). The V-shaped side plate (1) includes convex baffles (11) at both ends and V-shaped slots (12) evenly arranged in the middle. Different samples (3) are mounted on the V-shaped slots (12) of the opposite V-shaped side plates (1). The inside of the sample (3) is a conductor (31) and the outside is an insulator (32). The conductors (31) at both ends of the sample (3) are respectively mounted in the V-shaped slots (12). The insulator (32) in the middle section of the sample (3) is placed between the two V-shaped side plates (1).

2. The cross-linked polyethylene insulation heat shrinkage test bracket according to claim 1, characterized in that, The bottom end of the V-shaped side plate (1) is provided with a support foot.

3. The cross-linked polyethylene insulation heat shrinkage test bracket according to claim 2, characterized in that, The supporting foot is a bent bottom plate (13) perpendicular to the V-shaped side plate (1).

4. The cross-linked polyethylene insulation heat shrinkage test bracket according to claim 1, characterized in that, The side of the protruding edge (11) that connects with the V-shaped groove (12) is inclined inward.

5. The cross-linked polyethylene insulation heat shrinkage test bracket according to claim 1, characterized in that, The hand-held bracket (2) consists of at least one set of horizontally arranged connecting rods.

6. The cross-linked polyethylene insulation heat shrinkage test bracket according to claim 5, characterized in that, The two ends of the hand-held bracket (2) are bolted to the V-shaped side plate (1) at the connection port (14).

7. The cross-linked polyethylene insulation heat shrinkage test bracket according to claim 5, characterized in that, The two ends of the hand-held bracket (2) are welded to the V-shaped side plate (1) at the connection port (14).

8. The cross-linked polyethylene insulation heat shrinkage test bracket according to claim 5, characterized in that, The connecting rod is 250mm long and 5mm in diameter.

9. The cross-linked polyethylene insulation heat shrinkage test bracket according to claim 1, characterized in that, The opening of the V-shaped slot (12) is 15mm, the spacing is 15mm, and the height difference between the bottom of the V-shaped slot (12) and the top of the convex edge (11) is 25mm.

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