Pinhole test piece preparation device for water tree test

Abstract

The utility model belongs to the technical field of water tree experiments, particularly relates to a pinhole test piece preparation device for a water tree experiment, and provides the following scheme aiming at the problems that the spacing between pinholes cannot be accurately controlled and the pinhole defect deviation is caused by the fact that a test piece is easy to carry when a needle is lifted, the pinhole test piece preparation device comprises a pneumatic bench drill body, a pneumatic bench drill output shaft is arranged in the pneumatic bench drill body; the tungsten needle is arranged in the output shaft of the pneumatic bench drill and is used for punching the test piece; the connecting assembly is arranged between the tungsten needle and the pneumatic bench drill output shaft and used for installing and fixing the tungsten needle and adjusting the height of the tungsten needle; a placing table for placing a test piece is arranged on the upper side of the supporting plate, two groups of clamping assemblies are arranged in the placing table, and the two groups of clamping assemblies are used for clamping and fixing the two ends of the test piece; a test piece to be punctured can be stably fixed on the placing table, and the distance between the two clamping assemblies is adjusted through the adjusting assembly, so that the clamping requirements of test pieces with different sizes can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of water tree experiments, in particular to a pinhole test piece preparation device for a water tree test. Background Art

[0002] Traditional cross-linked polyethylene cables are widely used in my country's urban power grids due to their reliable mechanical and electrical properties. However, under AC stress and humid environments, polyethylene (PE) insulation materials are prone to aging and degradation, forming hydrophilic dendritic microchannels (water dendrites). Water dendrites produced by aging may further develop into electrical dendrites under overvoltage, eventually leading to insulation breakdown, seriously affecting the safe operation of the power grid.

[0003] Water treeing is an important indicator for measuring the life of insulating materials. In the prior art, when conducting water treeing experiments, it is necessary to use a flat plate of XLPE with multiple pinhole defects (depressions) formed by the needle piercing method. However, when making pinhole defects on a flat plate of XLPE, there are the following problems:

[0004] 1. The spacing between pinholes cannot be accurately controlled, and the test piece is easily carried along when the needle is lifted, resulting in pinhole defect deviation;

[0005] 2. When manufacturing pinhole defects, the defect depth cannot be accurately controlled;

[0006] 3. When creating pinhole defects, stress is generated inside the material, which easily forms small cracks. Utility Model Content

[0007] The utility model aims to solve the shortcomings in the prior art that the spacing between pinholes cannot be accurately controlled and the test piece is easily brought along when the needle is lifted, resulting in pinhole defect deviation, and a pinhole test piece preparation device for a water tree test is proposed.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A pinhole specimen preparation device for a water tree test comprises a pneumatic bench drill body, wherein the pneumatic bench drill body is provided with a pneumatic bench drill output shaft;

[0010] A tungsten needle, which is arranged in the output shaft of the pneumatic bench drill and is used to punch a hole in the test piece;

[0011] A connecting assembly, which is arranged between the tungsten needle and the output shaft of the pneumatic bench drill and is used to install and fix the tungsten needle and adjust the height of the tungsten needle;

[0012] A support plate, the support plate is fixed on the support frame of the pneumatic bench drill body, the upper side of the support plate is provided with a placement table for placing the test piece, the placement table is provided with two groups of clamping assemblies, and the two groups of clamping assemblies are used to clamp and fix the two ends of the test piece;

[0013] An adjusting component, which is arranged in the placement table and is used to adjust the distance between the two groups of clamping components;

[0014] A spacing adjustment component, which is arranged between the support plate and the placement table and is used to adjust the position of the test piece after a punching operation. A scale matching the placement table is provided at the top of the support plate;

[0015] The temperature control component is arranged on the upper side of the support plate and is used to control the temperature of the upper side of the support plate when processing the test piece.

[0016] In a possible design, the connecting assembly includes a matching groove opened in the output shaft of the pneumatic bench drill, a matching rod is provided in the matching groove, a third bolt is threadedly connected to the inner surface of the pneumatic bench drill output shaft, and a side end of the third bolt contacts the surface of the matching rod, a thread groove is opened in the output shaft of the pneumatic bench drill, a threaded rod is threadedly connected in the thread groove, the threaded rod is fixed to the top end of the matching rod, a receiving groove is opened in the matching rod, the tungsten needle is provided in the matching rod, a second bolt is threadedly connected to the inner surface of the matching rod, and a side end of the second bolt contacts the surface of the tungsten needle.

[0017] In a possible design, the adjustment component includes a second groove opened in the placement table, two threaded plates sliding in the second groove, a bidirectional screw rod threadedly connected in the second groove, the two threaded plates are respectively threadedly connected to the positive and negative thread segments on the circumferential surface of the bidirectional screw rod, a handle is fixed on the side end of the bidirectional screw rod, and an inverted U frame is fixed on the top of the two threaded plates.

[0018] In a possible design, each group of the clamping assemblies includes a clamping plate that slides in an inverted U-frame, and a first bolt is threadedly connected to the inner thread of the inverted U-frame, and a side end of the first bolt is rotated on the top end of the clamping plate.

[0019] In a possible design, the spacing adjustment assembly includes a first groove opened in the support plate, an adjusting screw rotates in the first groove, a connecting block slides in the first groove, the connecting block is threadedly connected to the surface of the adjusting screw, and the placement platform is fixed to the top of the adjusting screw.

[0020] In a possible design, the temperature control component includes a protective shell fixed to the top of the support plate, the protective shell is sleeved on the surface of the output shaft of the pneumatic bench drill, and the side end of the protective shell is movably hinged with a compartment door through a hinge shaft.

[0021] In a possible design, a handle is fixed to the side end of the adjusting screw rod, and a rubber sleeve is sleeved on the outer side of the handle.

[0022] In a possible design, the protective shell and the cabin door are both made of transparent acrylic panels, and a small air heater for heating the inside of the protective shell is fixed to the side end of the protective shell.

[0023] In the present application, when in use, the door of the chamber is opened, and after the test piece is placed on the placement table, the bidirectional screw is driven to rotate by twisting the handle, and the rotation of the bidirectional screw drives the two threaded plates to adjust the position, and the two threaded plates respectively drive the two inverted U frames to adjust the spacing, and after the two clamping plates are respectively driven to the two sides of the top of the test piece, the first bolt is screwed in turn to drive the clamping plates to move downward to fix the position of the test piece;

[0024] Install the tungsten needle, insert the tungsten needle into the receiving groove, screw the second bolt to fix the tungsten needle, then screw the matching rod to drive the threaded rod to rotate in the threaded groove to fix the position of the tungsten needle. At the same time, the lifting and lowering of the threaded rod can control the height of the tungsten needle, which is convenient for adjusting the height of the tungsten needle. After the height is adjusted, screw the third bolt to fix the position of the matching rod to keep it stable.

[0025] Then close the door and start the small air heater to heat the space inside the protective shell to ensure that the temperature around the test piece will not be too low when punching holes in the test piece. Start the pneumatic bench drill to drive the tungsten needle on the output shaft of the pneumatic bench drill to punch holes in the fixed test piece. After punching a hole, turn the handle to drive the adjusting screw to rotate. The rotation of the adjusting screw drives the placement table and the test piece on the placement table to move. Observe the scale and stop rotating after seeing that the placement table moves to the required spacing distance. Perform a second punching to get two holes with clear spacing.

[0026] In the utility model, the pinhole test piece preparation device for the water tree test can achieve the effect of stably fixing the test piece to be pierced on the placement table through the clamping component;

[0027] In the utility model, the pinhole specimen preparation device for the water tree test can achieve the effect of reducing the generation of fine cracks near the needle tip of the specimen due to the low temperature of the needle through the temperature control component;

[0028] In the utility model, the clamping assembly in the technical scheme can stably fix the test piece to be punctured on the placement table, and the spacing between the two groups of clamping assemblies can be adjusted by the adjustment assembly, which can meet the clamping requirements of test pieces of different sizes and is convenient for use. At the same time, the spacing adjustment assembly can be used in conjunction with the scale to effectively determine the spacing between multiple pinholes, and the depth of the pinhole can be controlled by the connecting assembly. Through the temperature control assembly, it can be achieved to reduce the generation of small cracks near the needle tip of the test piece caused by puncturing at a low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a front perspective view of a pinhole specimen preparation device for a water tree test proposed by the utility model;

[0030] Figure 2 It is a first partial stereoscopic diagram of a pinhole specimen preparation device for a water tree test proposed by the utility model;

[0031] Figure 3 It is a first partial cross-sectional view of a pinhole specimen preparation device for a water tree test proposed by the utility model;

[0032] Figure 4 A second partial stereoscopic diagram of a pinhole specimen preparation device for a water tree test proposed by the utility model;

[0033] Figure 5 This is a second partial cross-sectional view of a pinhole specimen preparation device for a water tree test proposed by the utility model.

[0034] In the figure: 1. pneumatic bench drill body; 101. pneumatic bench drill output shaft; 2. protective shell; 3. compartment door; 4. small air heater; 5. placement table; 6. support plate; 7. first groove; 8. adjustment screw; 9. turning handle; 10. twisting handle; 11. second groove; 12. threaded plate; 13. bidirectional screw; 14. inverted U frame; 15. clamping plate; 16. first bolt; 17. matching rod; 18. matching groove; 19. second bolt; 20. tungsten needle; 21. third bolt; 22. threaded groove; 23. threaded rod. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Example 1

[0036] Reference Figure 1-Figure 5 , a pinhole specimen preparation device for a water tree test, which is used in the field of water tree experiment technology, comprises a pneumatic bench drill body 1, in which a pneumatic bench drill output shaft 101 is arranged;

[0037] A tungsten needle 20, which is disposed in the output shaft 101 of the pneumatic bench drill and is used for drilling holes in the test piece;

[0038] The connecting component is arranged between the tungsten needle 20 and the output shaft 101 of the pneumatic bench drill for installing and fixing the tungsten needle 20 and adjusting the height of the tungsten needle 20; the connecting component includes a matching groove 18 opened in the output shaft 101 of the pneumatic bench drill, a matching rod 17 is arranged in the matching groove 18, a third bolt 21 is connected to the inner thread of the output shaft 101 of the pneumatic bench drill, the side end of the third bolt 21 is in contact with the surface of the matching rod 17, a thread groove 22 is opened in the output shaft 101 of the pneumatic bench drill, a threaded rod 23 is connected to the inner thread of the thread groove 22, the threaded rod 23 is fixed to the top end of the matching rod 17, and the matching rod 17 is connected to the matching rod 17. 7 is provided with a receiving groove, and the tungsten needle 20 is arranged in the matching rod 17. The matching rod 17 is internally threaded with a second bolt 19, and the side end of the second bolt 19 contacts the surface of the tungsten needle 20; the tungsten needle 20 is installed, the tungsten needle 20 is inserted into the receiving groove, the second bolt 19 is screwed to fix the tungsten needle 20, and then the matching rod 17 is screwed to drive the threaded rod 23 to rotate and fix the position of the tungsten needle 20 in the thread groove 22. At the same time, the lifting and lowering of the threaded rod 23 can control the height of the tungsten needle 20, which is convenient for adjusting the height of the tungsten needle 20. After the height is adjusted, the third bolt 21 is screwed to fix the position of the matching rod 17 to keep it stable.

[0039] Reference Figure 1-Figure 3 A pinhole specimen preparation device also includes a support plate 6, which is fixed on the support frame of the pneumatic bench drill body 1. A placement table 5 for placing the test piece is provided on the upper side of the support plate 6. Two groups of clamping assemblies are provided in the placement table 5, and the two groups of clamping assemblies are used to clamp and fix the two ends of the test piece; each group of clamping assemblies includes a clamping plate 15 sliding in an inverted U frame 14, and a first bolt 16 is connected to the inverted U frame 14 through a thread, and the side end of the first bolt 16 rotates on the top end of the clamping plate 15.

[0040] An adjusting component is arranged in the placing table 5 and is used to adjust the distance between the two groups of clamping components; the adjusting component includes a second groove 11 opened in the placing table 5, and two threaded plates 12 are slidably arranged in the second groove 11. A bidirectional screw rod 13 is threadedly connected in the second groove 11, and the two threaded plates 12 are respectively threadedly connected to the positive and negative thread segments on the circumferential surface of the bidirectional screw rod 13. A screw handle 10 is fixed to the side end of the bidirectional screw rod 13, and an inverted U-frame 14 is fixed to the top of the two threaded plates 12; when in use, the compartment door 3 is opened, and after the test piece is placed on the placing table 5, the bidirectional screw rod 13 is driven to rotate by screwing the screw handle 10, and the rotation of the bidirectional screw rod 13 drives the two threaded plates 12 to adjust the position, and the two threaded plates 12 respectively drive the two inverted U-frames 14 to adjust the spacing, and after the two clamping plates 15 are respectively driven to the two sides of the top of the test piece, the first bolt 16 is screwed in turn to drive the clamping plate 15 to move downward to fix the position of the test piece.

[0041] Reference Figure 1-Figure 3 , a pinhole test piece preparation device also includes a spacing adjustment component, which is arranged between the support plate 6 and the placement table 5 for adjusting the position of the test piece after a hole is punched once, and a scale matching the placement table 5 is provided at the top of the support plate 6; the spacing adjustment component includes a first groove 7 opened in the support plate 6, an adjusting screw 8 is rotated in the first groove 7, a connecting block is slid in the first groove 7, the connecting block is threadedly connected to the surface of the adjusting screw 8, the placement table 5 is fixed to the top of the adjusting screw 8, and a turning handle 9 is fixed to the side end of the adjusting screw 8; the pneumatic bench drill body 1 is started to drive the tungsten needle 20 on the output shaft 101 of the pneumatic bench drill to punch a hole in the fixed test piece, and after punching a hole, the adjusting screw 8 can be driven to rotate by rotating the turning handle 9, and the adjusting screw 8 rotates to drive the placement table 5 and the test piece on the placement table 5 to move, and the scale stops rotating after seeing that the placement table 5 moves to the required spacing distance, and a second punching is performed to obtain two holes with clear spacing. Example 2

[0042] refer to Figure 1-Figure 5 , improved on the basis of Example 1: a pinhole test piece preparation device also includes a temperature control component, the temperature control component is arranged on the upper side of the support plate 6 to control the temperature of the upper side of the support plate 6 when processing the test piece; the temperature control component includes a protective shell 2 fixed to the top of the support plate 6, the protective shell 2 is sleeved on the surface of the output shaft 101 of the pneumatic bench drill, the side end of the protective shell 2 is movably hinged with a door 3 through a hinge shaft, the protective shell 2 and the door 3 are both made of a transparent acrylic board, and the side end of the protective shell 2 is fixed with a small air heater 4 for heating the inside of the protective shell 2; then the door 3 is closed, and the small air heater 4 is started to heat the space inside the protective shell 2 to ensure that the temperature around the test piece will not be too low when the test piece is pierced;

[0043] Furthermore, a fan is provided in the protective shell 2. After the air heater is started, the fan quickly increases the air circulation in the protective shell 2, so that the temperature in the protective shell 2 can be more uniform, providing a more stable and suitable environment for piercing the test piece.

[0044] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A pinhole specimen preparation device for a water tree test, characterized in that: include: A pneumatic bench drill body (1), wherein a pneumatic bench drill output shaft (101) is provided in the pneumatic bench drill body (1); A tungsten needle (20), the tungsten needle (20) being arranged in an output shaft (101) of a pneumatic bench drill and used for drilling a hole in a test piece; A connecting assembly, the connecting assembly being arranged between the tungsten needle (20) and the output shaft (101) of the pneumatic bench drill and being used for installing and fixing the tungsten needle (20) and adjusting the height of the tungsten needle (20); A support plate (6), the support plate (6) being fixed on a support frame of the pneumatic bench drill body (1), a placement table (5) for placing a test piece being provided on the upper side of the support plate (6), two groups of clamping assemblies being provided in the placement table (5), the two groups of clamping assemblies being used to clamp and fix the two ends of the test piece; An adjustment component, which is arranged in the placement table (5) and is used to adjust the distance between the two groups of clamping components; A spacing adjustment component, the spacing adjustment component is arranged between the support plate (6) and the placement table (5) and is used to adjust the position of the test piece after a punching operation, and a scale matching the placement table (5) is provided at the top of the support plate (6); A temperature control component is provided on the upper side of the support plate (6) and is used to control the temperature of the upper side of the support plate (6) when processing the test piece.

2. The pinhole specimen preparation device for water tree test according to claim 1, characterized in that: The connection assembly comprises a matching groove (18) provided in an output shaft (101) of a pneumatic bench drill, a matching rod (17) being provided in the matching groove (18), a third bolt (21) being threadedly connected to the output shaft (101) of the pneumatic bench drill, a side end of the third bolt (21) being in contact with the surface of the matching rod (17), a thread groove (22) being provided in the output shaft (101) of the pneumatic bench drill, a threaded rod (23) being threadedly connected to the thread groove (22), the threaded rod (23) being fixed to the top end of the matching rod (17), a receiving groove being provided in the matching rod (17), the tungsten needle (20) being provided in the matching rod (17), a second bolt (19) being threadedly connected to the matching rod (17), a side end of the second bolt (19) being in contact with the surface of the tungsten needle (20).

3. The pinhole specimen preparation device for water tree test according to claim 2, characterized in that: The adjustment component comprises a second groove (11) opened in the placing table (5), two threaded plates (12) are slidably arranged in the second groove (11), a bidirectional screw rod (13) is threadedly connected to the inner thread of the second groove (11), the two threaded plates (12) are respectively threadedly connected to the positive and negative thread segments on the circumferential surface of the bidirectional screw rod (13), a handle (10) is fixed to the side end of the bidirectional screw rod (13), and an inverted U-frame (14) is fixed to the top end of the two threaded plates (12).

4. The pinhole specimen preparation device for water tree test according to claim 3, characterized in that: Each group of the clamping assemblies comprises a clamping plate (15) sliding in an inverted U-frame (14); a first bolt (16) is internally threadedly connected to the inverted U-frame (14); and a side end of the first bolt (16) is rotated on the top end of the clamping plate (15).

5. A pinhole specimen preparation device for water tree test according to any one of claims 1 to 3, characterized in that: The spacing adjustment component comprises a first groove (7) formed in the support plate (6), an adjusting screw (8) rotating in the first groove (7), a connecting block sliding in the first groove (7), the connecting block being threadedly connected to the surface of the adjusting screw (8), and the placing platform (5) being fixed to the top end of the adjusting screw (8).

6. The pinhole specimen preparation device for water tree test according to claim 1, characterized in that: The temperature control component comprises a protective shell (2) fixed to the top of a support plate (6); the protective shell (2) is sleeved on the surface of an output shaft (101) of a pneumatic bench drill; and a compartment door (3) is movably hinged at a side end of the protective shell (2) via a hinge shaft.

7. The pinhole specimen preparation device for water tree test according to claim 5, characterized in that: A turning handle (9) is fixed to the side end of the adjusting screw rod (8), and a rubber sleeve is sleeved on the outer side of the turning handle (9).

8. The pinhole specimen preparation device for water tree test according to claim 6, characterized in that: The protective shell (2) and the door (3) are both made of transparent acrylic board, and a small air heater (4) for heating the inside of the protective shell (2) is fixed to the side end of the protective shell (2).

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