Cable sheath material thermal extension test device

Abstract

The utility model relates to a cable sheath material thermal extension test device, which comprises a clamping structure used for clamping a material strip, the clamping structure comprises two symmetrically arranged clamping parts, each clamping part comprises an outer clamping plate and an inner clamping plate which are arranged at an interval from outside to inside, a deformation part is connected between the outer clamping plate and the inner clamping plate, and the deformation part is connected with the material strip. And the deformation part can be deformed in a test so as to drive the inner clamping plate to clamp the material strip. Through the arrangement of the deformation part, the inner clamping plate can be driven to further move to clamp the material strip when the material strip is softened, so that the material strip can still be clamped in a softened state.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable sheath testing, and particularly relates to a thermal elongation test device for cable sheath materials. Background Art

[0002] The thermal elongation test device for cable sheath materials is a detection device set for cross-linked cable insulation and sheath materials; it refers to measuring the elongation rate and permanent deformation rate of insulation and sheath materials under heat and load to achieve the inspection of materials.

[0003] In a specific experiment, the connection between the load and the material and the connection between the material and the suspension bracket are both realized through a clamping device. However, the material often softens and deforms after being heated by fire, and the connection effect between the clamping device and the material is affected. Summary of the Utility Model

[0004] The utility model aims at the problems of the prior art and provides a thermal elongation test device for cable sheath materials. The specific technical solutions are as follows:

[0005] The thermal elongation test device for cable sheath materials includes a clamping structure for clamping a material strip. The clamping structure includes two symmetrically arranged clamping parts. Each clamping part includes an outer clamping plate and an inner clamping plate which are arranged at intervals from outside to inside. A deformation part is connected between the outer clamping plate and the inner clamping plate. The deformation part can deform during the test and drive the inner clamping plate to clamp the material strip.

[0006] As a further technical solution of the utility model, the deformation part includes an elastic member and a telescopic rod. The elastic member is in a compressed state and drives the inner clamping plate to clamp the material.

[0007] As a further technical solution of the utility model, the deformation part includes an airbag filled with a heat-expandable medium.

[0008] As a further technical solution of the utility model, the clamping end of the inner clamping plate is a corrugated structure, and the clamping ends of two relatively arranged inner clamping plates are mutually adapted.

[0009] As a further technical solution of the utility model, the clamping structure includes a connecting plate, and mounting holes are formed in the connecting plate.

[0010] As a further technical solution of the utility model, a bidirectional lead screw is rotatably connected to one end of the connecting plate facing the material, and the two clamping parts are symmetrically distributed on both sides of the bidirectional lead screw.

[0011] The beneficial effects of the utility model are as follows:

[0012] In this application, through the setting of the deformation part, while the material strip is softened, the inner clamping plate can be driven to move further to clamp the material strip, so as to ensure that the material strip can still be clamped in the softened state. Description of the Drawings

[0013] Figure 1 Shows a schematic diagram of the overall structure of the thermal elongation test device for cable sheath materials;

[0014] Figure 2 Shows a schematic diagram of the clamping structure in Embodiment 1;

[0015] Figure 3 Shows a schematic diagram of the clamping structure in Embodiment 2.

[0016] Legend Explanation:

[0017] 100, suspension hanger; 110, material strip; 120, weight pan; 130, scale; 200, clamping structure; 210, connecting plate; 211, mounting hole; 220, bidirectional lead screw; 230, outer clamping plate; 240, inner clamping plate; 250, deformation part; 251, elastic member; 252, telescopic rod; 253, airbag. Detailed Embodiments

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments.

[0019] This application aims at the technical problem that the material is softened and deformed after heating, which is not conducive to the connection with the clamping device; by setting the deformation part, and the deformation part will squeeze the clamping plate during the heating process, forcing the clamping plate to clamp the material.

[0020] Figure 1 Shows a schematic diagram of the overall structure of the thermal elongation test device for cable sheath materials; Figure 1 In this, the thermal elongation test device for cable sheath materials includes a suspension hanger 100. A material strip 110 is suspended on the suspension hanger 100 through a clamping structure 200. The other end of the material strip 110 is connected to a weight pan 120 through a clamping structure 200. A scale 130 adjacent to the material strip 110 is also installed on the suspension hanger 100; the current length of the material strip 110 is observed through the scale 130 and recorded as L1. Then weights are placed on the weight pan 120 to load the material strip 110. Then the entire suspension hanger 100 is placed in a heating device and heated at 200 °C for 15 minutes. Then the current length of the material strip 110 is observed and recorded as L2. The deformation amount is L2 minus L1.

[0021] Embodiment 1

[0022] Figure 2Shows the structural schematic diagram of the clamping structure 200 in Embodiment 1; Figure 2 In it, the clamping structure 200 includes a connecting plate 210. An installation hole 211 is provided on the connecting plate 210. One end of the connecting plate 210 facing the material is rotatably connected with a bidirectional lead screw 220. Two groups of clamping parts are symmetrically and rotatably connected on the bidirectional lead screw 220. In actual use, the installation hole 211 can integrally install the clamping structure 200 on the suspension bracket 100 and the weight tray 120, so that the clamping structure 200 is detachably connected to the suspension bracket 100 and the weight tray 120. And the two clamping parts can clamp the middle material. At the same time, the setting of the bidirectional lead screw 220 allows the two clamping parts to move in opposite directions, that is, to adjust the distance between the two clamping parts, so that the material is clamped by the two clamping parts before being put into the heating device. The clamping part includes an outer clamping plate 230 and an inner clamping plate 240 which are arranged at intervals from the outside to the inside. A deformation part 250 is connected between the outer clamping plate 230 and the inner clamping plate 240. The deformation part 250 can drive the inner clamping plate 240 to squeeze and clamp the material during the test. The deformation part 250 includes an elastic member 251 and a telescopic rod 252. The elastic member 251 is in a compressed state and drives the inner clamping plate 240 to clamp the material. Through the elastic force of the elastic member 251, the inner clamping plate 240 has a tendency force to move towards the material. And when the material is softened, the distance between the two inner clamping plates 240 can automatically shorten, so as to ensure the clamping effect on the material. And the setting of the telescopic rod 252 can ensure the movement track of the inner clamping plate 240. The clamping end of the inner clamping plate 240 is a corrugated structure, and the clamping ends of the two relatively arranged inner clamping plates 240 are mutually adapted. That is, the end face of the inner clamping plate 240 in direct contact with the material is a corrugated structure, which can increase the static friction force that needs to be overcome for the relative movement between the inner clamping plate 240 and the material, thereby increasing the clamping effect.

[0023] Embodiment 2

[0024] Figure 3 Shows the structural schematic diagram of the clamping structure 200 in Embodiment 2; Figure 3 In it, Figure 2Among them, the clamping structure 200 includes a connecting plate 210. An installation hole 211 is formed in the connecting plate 210. A bidirectional lead screw 220 is rotatably connected to one end of the connecting plate 210 facing the material. Two groups of clamping parts are symmetrically and rotatably connected to the bidirectional lead screw 220. In actual use, the installation hole 211 can integrally install the clamping structure 200 on the suspension bracket 100 and the weight tray 120, so that the clamping structure 200 is detachably connected to the suspension bracket 100 and the weight tray 120. The two clamping parts can clamp the middle material. At the same time, the setting of the bidirectional lead screw 220 allows the two clamping parts to move in opposite directions, that is, to adjust the distance between the two clamping parts, so that the material is clamped by the two clamping parts before being put into the heating device. The clamping part includes an outer clamping plate 230 and an inner clamping plate 240 which are arranged at intervals from outside to inside. A deformation part 250 is connected between the outer clamping plate 230 and the inner clamping plate 240. The deformation part 250 can drive the inner clamping plate 240 to squeeze and clamp the material during the test. The deformation part 250 includes an airbag 253, and a heat-expandable medium is filled in the airbag 253. For example, nitrogen. When the material is softened by heat, the medium in the airbag 253 will expand, thereby driving the inner clamping plate 240 to move towards the material, that is, the distance between the two inner clamping plates 240 can be automatically shortened, so as to ensure the clamping effect on the material. The setting of the telescopic rod 252 can ensure the movement track of the inner clamping plate 240. The clamping end of the inner clamping plate 240 is a waveform structure, and the clamping ends of the two relatively arranged inner clamping plates 240 are mutually adapted. That is, the end surface of the inner clamping plate 240 in direct contact with the material is a waveform structure, which can increase the static friction force that needs to be overcome when relative movement occurs between the inner clamping plate 240 and the material, thereby increasing the clamping effect.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. Thermal elongation test device for cable sheath material, including a clamping structure (200) for clamping a material strip (110), characterized in that: The clamping structure (200) includes two symmetrically arranged clamping parts. Each clamping part includes an outer clamping plate (230) and an inner clamping plate (240) which are arranged at intervals from outside to inside. A deformation part (250) is connected between the outer clamping plate (230) and the inner clamping plate (240). The deformation part (250) can deform during the test and drive the inner clamping plate (240) to clamp the material strip (110).

2. The thermal elongation test device for cable sheath materials according to claim 1, characterized in that: The deformation part (250) includes an elastic member (251) and a telescopic rod (252). The elastic member (251) is in a compressed state and drives the inner clamping plate (240) to clamp the material.

3. The thermal elongation test device for cable sheath materials according to claim 1, characterized in that: The deformation part (250) includes an airbag (253). The airbag (253) is filled with a heat-expandable medium.

4. The thermal elongation test device for cable sheath materials according to claim 2 or 3, characterized in that: The clamping end of the inner clamping plate (240) is a corrugated structure, and the clamping ends of two oppositely arranged inner clamping plates (240) are mutually adapted.

5. The thermal elongation test device for cable sheath materials according to claim 2 or 3, characterized in that: The clamping structure (200) includes a connecting plate (210). An installation hole (211) is formed in the connecting plate (210).

6. The thermal elongation test device for cable sheath materials according to claim 5, characterized in that: One end of the connecting plate (210) facing the material strip (110) is rotatably connected with a bidirectional lead screw (220). The two clamping parts are symmetrically distributed on both sides of the bidirectional lead screw (220).

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