Electric wire and cable thermal extension test device

Abstract

The utility model discloses an electric wire and cable thermal extension test device, which belongs to the technical field of cable test and comprises a cable main body used for carrying out thermal extension test, plug boards are embedded in the top surface and the bottom surface of the cable main body in a sliding mode, fixing bolts are in threaded connection with the outer side walls of the plug boards, and the end faces of the fixing bolts abut against the cable main body. The bottom surface of the plug board at the lower part is connected with a weight for providing load pressure for the cable main body; the side face of the supporting rod is in interference fit with a limiting bearing, a limiting ring is welded to the outer ring of the limiting bearing, an inverted-U-shaped limiting plate is fixedly connected to the bottom face of the limiting ring, rotating blocks are rotationally connected to the two side walls of the limiting plate in an embedded mode, rotating plates are welded to the adjacent sides of the two rotating blocks, and connecting rods are welded to the bottom faces of the rotating plates. According to the utility model, the cable main body for the thermal extension test is in a horizontal state, so that the precision of the thermal extension test of the cable main body is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable test technical field especially a kind of electric wire and cable hot extension test device. BACKGROUND

[0002] The principle of electric wire and cable hot extension test is to evaluate the performance of cable insulation and sheath material by measuring crosslinking degree, so that the elongation and permanent deformation of insulation and sheath material are measured under the action of heat and load, the temperature is usually 200 DEG C, and the standard load pressure applied to the sample is usually 0.2MPa. The existing hot extension test device usually adopts the mode of pulling by weight gravity when in use, and the hot extension test device is prone to tilting, so that the cable insulation and sheath material are not in vertical state, and the test precision of the hot extension test device on electric wire and cable is reduced.

[0003] After searching, it is found that the scheme of electric wire and cable hot extension test device (announcement number CN215448806U) includes test support, a plurality of telescopic rulers and a plurality of clamping devices are installed on the test support, the telescopic rulers are located at the edges of the clamping devices; the upper clamping device and the lower clamping device clamp the two ends of the sample respectively, the lower clamping device is connected with a hanging load support rod, and the hanging load support rod is prepared with different standard test weights; the upper clamping device and the lower clamping device each include a support plate and a tension plate, and the support plate and the tension plate have a clamping space therebetween; a tension bolt is installed on a threaded hole through an adjusting through hole, and the distance between the support plate and the tension plate is adjusted by rotating the tension bolt; the utility model avoids accidental fracture caused by poor clamp, but the device does not consider that it is prone to tilting when in use, so that the hot extension test device is not in horizontal state, and the test precision of the hot extension test device on electric wire and cable is reduced. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an electric wire and cable hot extension test device to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an electric wire and cable hot extension test device, comprising:

[0006] The cable body for hot extension test, the top surface and the bottom surface of the cable body are both embedded with plug-in plates connected by sliding, the outer side wall of the plug-in plate is threadedly connected with a fixing bolt, the end surface of the fixing bolt abuts against the cable body, and the bottom surface of the lower plug-in plate is connected with a weight for providing load pressure to the cable body;

[0007] The support rod is in side surface interference fit with a limiting bearing, the outer ring of the limiting bearing is welded with a limiting ring, the bottom surface of the limiting ring is fixedly connected with an inverted U-shaped limiting plate, the both side walls of the limiting plate are in embedded rotary connection with rotary blocks, the adjacent sides of the two rotary blocks are welded with rotary plates, the bottom surface of the rotary plate is welded with a connecting rod, and the bottom surface of the connecting rod is welded with the upper inserting plate.

[0008] Preferably, the both side surfaces of the rotary plate are in rotary frictional contact with the limiting plate, and the both end surfaces of the support rod are welded with support plates.

[0009] Preferably, the bottom surface of the two support plates is fixedly connected with a bottom plate, and the both end surfaces of the bottom plate are provided with support assemblies.

[0010] Preferably, the support assembly comprises two support blocks and two telescopic outer rods.

[0011] Preferably, the adjacent sides of the two telescopic outer rods are welded with the bottom plate, and the both end surfaces of the telescopic outer rods are in embedded sliding connection with telescopic inner rods.

[0012] Preferably, the end surface of the telescopic inner rod is fixedly connected with the support block.

[0013] Preferably, the top surface of the telescopic outer rod is provided with a through groove, and the through groove of the telescopic outer rod is movably connected with two limiting bolts.

[0014] Preferably, the limiting bolt is in threaded connection with the telescopic inner rod.

[0015] Compared with the prior art, the technical effects and advantages of the utility model are as follows:

[0016] The electric wire and cable heat extension test device is used for placing the cable main body to be subjected to heat extension test in the inner cavities of the two inserting plates, fixing through the fixing bolts, providing the longitudinal tension through the set weight, placing the heat extension test device in the oven for heating, providing the heat extension test effect on the cable main body, fixing the rotary position of the limiting ring through the set limiting bearing, simultaneously realizing the relative rotation of the support rod and the limiting ring, fixing the rotary position of the two rotary blocks through the set limiting plate, further fixing the rotary position of the rotary plate, conveniently making the cable main body subjected to heat extension test in the vertical state during the transmission process, and improving the test precision of the heat extension test device.

[0017] The electric wire and cable heat extension test device, the two support plates provide support to one support rod, and the bottom plate provides support and fixing to the two telescopic outer rods, the further support is provided by the bottom plate and the two telescopic outer rods, the limit bolt is rotated, the abutment of the head of the limit bolt and the telescopic outer rod is released, the telescopic inner rod is moved along the inner cavity of the telescopic outer rod, the transverse support range of the four support blocks is adjusted during transmission, the support stability of the heat extension test device is improved, the limit bolt is moved downward along the threaded path of the telescopic inner rod, the head of the limit bolt abuts against the top surface of the telescopic outer rod, the position of the telescopic inner rod is fixed, and the structural stability of the device parts is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0019] Figure 1 It is a structural schematic diagram of the present application;

[0020] Figure 2 It is a structural schematic diagram of the present application;

[0021] Figure 3 It is a structural schematic diagram of the present application; Figure 2 It is an enlarged view of structure A in the middle;

[0022] Figure 4 It is a structural schematic diagram of the support assembly of the present application.

[0023] Explanation of reference signs:

[0024] In the figure: 1, support rod; 2, limit bearing; 3, limit ring; 4, limit plate; 5, rotating block; 6, rotating plate; 7, connecting rod; 8, plug-in plate; 9, cable main body; 10, fixed bolt; 11, weight; 12, support plate; 13, bottom plate; 14, support assembly; 15, telescopic outer rod; 16, telescopic inner rod; 17, limit bolt; 18, support block. Specific embodiments

[0025] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail in order to avoid unnecessarily complicating the present application.

[0026] Unless the direction is defined separately, the up, down, left, right, front, back, inner and outer directions mentioned in the present application are based on the up, down, left, right, front, back, inner and outer directions in the drawings of the present application, which are explained herein.

[0027] The connection mode can adopt existing modes such as bonding, welding, bolt connection, etc., and the actual needs are accurate.

[0028] In order to solve the problem that the wire and cable heat extension test device is prone to tilt during use, reducing the test precision of the wire and cable heat extension test device, please refer to Figures 1 to 4 , the structure of the device body is as follows:

[0029] The cable body 9 is used for heat extension test, the top surface and the bottom surface of the cable body 9 are embedded with the plug-in plate 8 in a sliding connection mode, the two ends of the cable body 9 are plugged into the plug-in plate 8, the outer side wall of the plug-in plate 8 is screwed with the fixed bolt 10, the end surface of the fixed bolt 10 abuts against the cable body 9, the fixed bolt 10 moves along the threaded path of the plug-in plate 8, the end surface of the fixed bolt 10 extrudes the cable body 9, and the fixed bolt 10 provides a position fixing effect for the cable body 9, the bottom surface of the lower plug-in plate 8 is connected with the weight 11 for providing a load pressure for the cable body 9, the weight 11 moves downward under the action of gravity, and then provides a longitudinal load for the heat extension test of the cable body 9, so that the heat extension test device is placed in an oven, and the oven heats the cable body 9 to be heated, and the temperature is usually 200 DEG C;

[0030] The support rod 1 is provided with the limit bearing 2 in an interference fit mode, the outer ring of the limit bearing 2 is welded with the limit ring 3, the limit ring 3 is fixed in the rotating position of the limit bearing 2, and the relative rotation of the limit ring 3 and the support rod 1 is facilitated, the limit ring 3 is fixedly connected with the inverted U-shaped limit plate 4 at the bottom surface, the limit ring 3 provides support and fixing effect for the limit plate 4, the two rotating blocks 5 are rotatably connected in the limit plate 4 in an embedded mode, the rotating position of the two rotating blocks 5 is fixed by the limit plate 4, the rotating plate 6 is welded on the adjacent sides of the two rotating blocks 5, and then the rotating stability of the rotating plate 6 is improved, the connecting rod 7 is welded at the bottom surface of the rotating plate 6, and the connecting rod 7 is welded with the upper plug-in plate 8, so that the cable body 9 to be heat extended is in a vertical state during the transmission process, the heat extension test of the cable body 9 is provided with conditions, and the heat extension test precision of the heat extension test device is improved.

[0031] The two side surfaces of the rotating plate 6 are in rotating frictional contact with the limiting plate 4, further improving the rotating stability of the rotating plate 6, and the two end surfaces of the supporting rod 1 are welded with supporting plates 12, and the two supporting plates 12 provide support for the supporting rod 1, the bottom surface of the two supporting plates 12 is fixedly connected with a bottom plate 13, the two end surfaces of the bottom plate 13 are provided with supporting assemblies 14, the supporting assemblies 14 include two supporting blocks 18 and two telescopic outer rods 15 which are internally hollow, the two telescopic outer rods 15 are welded with the bottom plate 13, and the bottom surface of the two telescopic outer rods 15 is flush with the bottom surface of the bottom plate 13, improving the support stability of the two telescopic outer rods 15 and the bottom plate 13, and the two telescopic inner rods 16 are slidingly connected with the two end surfaces of the telescopic outer rod 15, so that the two telescopic inner rods 16 move along the inner cavity of the telescopic outer rod 15.

[0032] The movement path of the telescopic inner rod 16 is fixed, the end surface of the telescopic inner rod 16 is fixedly connected with the supporting block 18, and the supporting block 18 provides support, the bottom surface of the supporting block 18 is flush with the bottom surface of the bottom plate 13, and the supporting range of the four supporting blocks 18 is adjusted, the support stability of the hot stretching test device is improved, the top surface of the telescopic outer rod 15 is provided with a through slot, the through slot of the telescopic outer rod 15 is movably connected with two limiting bolts 17, the limiting bolts 17 are threadedly connected with the telescopic inner rod 16, the limiting bolts 17 are rotated, and then the limiting bolts 17 move downward along the thread path of the telescopic inner rod 16, so that the head of the limiting bolt 17 abuts against the top surface of the telescopic outer rod 15, the extrusion force between the head of the limiting bolt 17 and the top surface of the telescopic outer rod 15 is increased, the static friction force is increased under the action of the frictional resistance, the telescopic inner rod 16 is prevented from shaking and deviating, and the structural stability of the device parts is improved.

[0033] Working principle

[0034] The electric wire and cable hot stretching test device, when used, the user extends the two end surfaces of the cable main body 9 into the grooves of the two plug-in plates 8, rotates the fixed bolt 10, and then moves the fixed bolt 10 downward along the thread path of the plug-in plate 8, so that the end surface of the fixed bolt 10 abuts against the cable main body 9, fixes the cable main body 9, the limiting bearing 2 is arranged, the relative rotation between the limiting ring 3 and the supporting rod 1 is realized, the rotating positions of the two rotating blocks 5 and the rotating plate 6 are fixed by the limiting plate 4, the rotating direction of the rotating plate 6 is perpendicular to that of the limiting ring 3, the cable main body 9 is in a vertical state during transmission, the hot stretching test device is placed in the oven for heating, and the cable main body 9 is subjected to hot stretching test under the load tension of the weight 11.

[0035] The limiting bolt 17 is rotated to move along the threaded path of the telescopic inner rod 16, the head of the limiting bolt 17 is separated from the abutting of the top surface of the telescopic outer rod 15, the telescopic inner rod 16 is moved along the inner cavity of the telescopic outer rod 15, the supporting range of the four supporting blocks 18 is adjusted, the abutting force of the head of the limiting bolt 17 and the top surface of the telescopic outer rod 15 is strengthened, and the telescopic inner rod 16 is prevented from shaking and deviating.

[0036] It should be noted that, in this document, relational terms such as one and the other and at least one of are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying that each modified entity or action must exist separately from another entity or action. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An inclusion of an element by the use of "including" or "comprising" does not exclude, without more limitations, other

[0037] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An electrical wire and cable heat extension test apparatus characterized by, The utility model relates to a cable main body (9) for carrying out heat extension test, the cable main body (9) top surface and bottom surface both embed the sliding connection of plug -in board (8), plug -in board (8) outside wall thread connection has fixed bolt (10), fixed bolt (10) end surface and cable main body (9) abut, the bottom surface of the plug -in board (8) of lower part is connected with the weight (11) for providing the load pressure of cable main body (9); Supporting rod (1), the side face of supporting rod (1) is interference fit with limiting bearing (2), the outer ring of limiting bearing (2) is welded with limiting ring (3), the bottom surface of limiting ring (3) is fixedly connected with the limiting plate (4) of inverted U shape, the both sides wall of limiting plate (4) is embedded with rotatable block (5) rotationally connected, two rotatable block (5) adjacent side welding has rotary plate (6), the bottom surface of rotary plate (6) is welded with connecting rod (7), the bottom surface of connecting rod (7) is welded with the plug -in board (8) of upper part. Rotary plate (6) both sides wall and limiting plate (4) rotationally rub contact, the both end surfaces of supporting rod (1) are welded with support plate (12).

2. A device for testing the heat extension of an electric wire or cable according to claim 1, characterized in that: Two support plates (12) bottom surface fixedly connected with bottom plate (13), the both end surfaces of bottom plate (13) are provided with support assembly (14).

3. An electrical wire and cable heat run test apparatus as defined in claim 2, wherein: Support assembly (14) contains internally hollow telescopic outer rod (15) and two support blocks (18) providing support.

4. An electrical wire and cable heat run test apparatus as defined in claim 3, wherein: Two telescopic outer rods (15) adjacent side welding with bottom plate (13), telescopic outer rod (15) both end surface embedded sliding connection has telescopic inner rod (16).

5. A device for testing the heat extension of an electric wire or cable according to claim 4, characterized in that: Telescopic inner rod (16) end surface and support block (18) fixed connection.

6. A device for testing the heat extension of an electric wire or cable according to claim 5, characterized in that: The top surface of telescopic outer rod (15) is provided with a through slot, and two limiting bolts (17) are movably connected to the inner wall of the through slot of the telescopic outer rod (15).

7. A device for testing the heat extension of an electric wire or cable according to claim 6, characterized in that: Limiting bolt (17) and telescopic inner rod (16) are threadedly connected.

8. A device for testing the heat extension of an electric wire or cable according to claim 7, characterized in that: ​

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