A three-pillar single-leg tensile test device and method for GIL

Abstract

The present invention relates to a three-pillar single-leg tensile test device and method for GIL in a common box, comprising a supporting platform and a test frame, the test frame comprising a lower pull-down plate and an upper pull-down plate, the upper pull-down plate being detachably fixedly connected to the lower pull-down plate through three supporting plates, the lower pull-down plate and the upper pull-down plate both being provided with a heart-shaped hole for accommodating a three-pillar embedded tube to vertically pass through, the heart-shaped hole comprising two long holes with crossed ends, the two long holes being respectively parallel to the axes of two adjacent three-pillar inserts, the tip of the heart-shaped hole facing the rotating shaft of the lower pull-down plate, the ends of the three-pillar inserts being detachably connected with tensile studs, and the supporting plates being detachably connected with tensile bolts coaxial with the opposite three-pillar inserts. The present invention solves the problem that it is time-consuming and labor-intensive to perform a single-leg tensile test on fixed three pillars, and the device improves the test efficiency of the single-leg tensile test on fixed three pillars by integrating a platform height adjustment unit, a three-pillar rotation unit, and a guide and positioning unit, while also reducing the labor intensity of the test.

Description

Technical Field

[0001] The invention relates to the field of three pillars, and in particular to a single-leg tensile test device and method for a GIL using a common box three pillars. Background Art

[0002] Gas-insulated Metal-enclosed Transmission Line is a new type of transmission busbar. It has the advantages of safety, reliability, high efficiency, intensiveness and intelligence. It has obvious performance advantages over overhead lines and underground cables. In the future, with the continuous improvement of GIL technology and the continuous decline in production costs, market demand will be further released, and the market prospects are broad. As the key components of GIL equipment, the three pillars are installed in the GIL cylinder and mainly play the role of insulation and support, which plays a critical role in the normal operation of GIL equipment.

[0003] The three-pillar consists of a three-pillar body, three three-pillar inserts and three three-pillar embedded cylinders. In order to ensure the mechanical properties of the three-pillar, the three-pillar needs to be subjected to routine factory tests and destructive sampling tests before leaving the factory. Especially when the fixed three-pillar is subjected to single-leg tensile test, since the three column legs need to be subjected to routine tensile test one by one, the conventional test method is to use a crane to hang the three-pillar on the working platform, and then use two people to lift and slightly adjust the direction of any column leg of the three-pillar, so that the column leg axis and the tensile direction of the tensile testing machine are as close to the same axis as possible, so that a column leg of the three-pillar can be connected to one end of the tensile testing machine with a stud; the other end of the tensile testing machine is connected to the tooling on the three-pillar embedded cylinder, and a single-leg tensile test is performed after the connection is completed; after the single-leg tensile test is completed, the remaining two column legs are lifted by manpower to rotate the three-pillar as a whole on the platform and make slight adjustments, and the remaining steps are the same as the first column leg, and the single-leg tensile test of the remaining two column legs is performed in sequence.

[0004] At present, the height of the three-pillar platform cannot be adjusted, manual rotation of the three pillars is time-consuming and laborious, and it is difficult to align the axial direction of the three-pillar column legs and the tensile direction of the tensile testing machine by manpower. These factors have hindered the improvement of test efficiency, and frequent lifting can easily damage the three pillars and reduce product quality. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a three-pillar single-leg tensile test device and method for a GIL in a common box.

[0006] The present invention is achieved through the following technical scheme, which provides a three-pillar single-leg tensile test device for GIL in a common box, including a support platform and a test frame, the test frame including a pull-down plate rotatably connected to the support platform and an upper pull-up plate located above the pull-down plate, the upper pull-up plate being detachably fixed to the pull-down plate through three support plates, the three pillars being horizontally arranged between the upper pull-up plate and the pull-down plate and the centers of the three pillars being coaxial with the rotating shaft of the pull-down plate, the pull-down plate and the upper pull-up plate both being provided with a heart-shaped hole for accommodating the vertical passage of a three-pillar embedded tube, the heart-shaped hole including two long holes with intersecting ends, the two long holes being respectively parallel to the axes of two adjacent three-pillar inserts, the tip of the heart-shaped hole facing the rotating shaft of the pull-down plate, the end of the three-pillar insert being detachably connected with a tensile stud, and the support plate being detachably connected with a tensile bolt coaxial with the opposite three-pillar insert.

[0007] The stretching bolts and stretching studs in this scheme are respectively connected to the two ends of the tensile testing machine, and the three-pillar embedded tube is fitted at the tip of the heart-shaped hole. By pulling the stretching bolts and the stretching studs toward both ends, the three-pillar embedded tube and the three-pillar inserts on the opposite side are pulled toward both sides to achieve stretching. The two long holes of the heart-shaped hole are respectively parallel to the axes of the two adjacent three-pillar inserts, so the heart-shaped holes on both sides do not interfere with the three-pillar embedded tubes inside them.

[0008] As an optimization, the lower end surface of the upper pull plate and the upper end surface of the lower pull plate are both fixedly connected with a tetrafluoro support block that fits the three-pillar body. The tetrafluoro support block in this solution is used to support the three-pillar body.

[0009] As an optimization, the support platform includes a transverse platform plate and four platform columns supporting the platform plate, the upper ends of the platform columns are provided with external threads, and the external threads are equipped with leveling bolts fastened to the upper and lower sides of the platform plate. The leveling bolts in this solution are used to adjust the height and level of the platform plate.

[0010] As an optimization, the center of the pull-down plate is fixed with a guide column adapted to the center hole of the three-pillar body, and the center of the pull-up plate is provided with a round hole for the guide column to pass through. The guide column in this solution plays a guiding and positioning role when installing the three pillars and the pull-up plate.

[0011] As an optimization, a rotating shaft is fixedly connected to the lower end of the pull-down plate, and the rotating shaft is connected to the supporting platform through a bearing. The bearing structure in this solution can realize the rotation of the three pillars around the axis on the platform, reducing the workload of the test personnel.

[0012] As an optimization, a rotating motor is also included to drive the test frame to rotate. The rotating motor in this solution realizes the rotation of the three pillars, which is convenient for testing.

[0013] As an optimization, the tip of the heart-shaped hole is arc-shaped and fits with the outer ring of the three-pillar embedded tube. In this solution, the tip of the heart-shaped hole is arc-shaped and fits with the outer ring of the three-pillar embedded tube, so it is not easy to damage the three-pillar embedded tube.

[0014] As an optimization, the support plate is fixed to the side of the lower pull plate by bolts, a connecting screw is fixed to the upper end of the support plate, and the upper pull plate is connected to the connecting screw. In this solution, the upper pull plate is connected to the connecting screw, so as to facilitate the upper and lower installation and disassembly of the upper pull plate.

[0015] As an optimization, the support plate is provided with a circular hole for the stretching bolt to pass through. In this solution, the stretching bolt passes through the circular hole, leaving the bolt head inside the support plate, thereby achieving stretching.

[0016] A tensile test method comprises the following steps:

[0017] a. Adjust the support platform to a suitable height and level it;

[0018] b. Use the lifting tools to lift the three pillars and place them on the pull-down plate, so as to support the three pillars as a whole and prevent them from being damaged;

[0019] c. The upper pull plate is detachably fixed to the lower pull plate to fix the three pillars, and the three pillar embedded tubes are passed through the heart-shaped holes of the lower pull plate and the upper pull plate;

[0020] d. Install a tension stud on the end of one of the three-pillar inserts and a tension bolt on the opposite support plate;

[0021] e. Connect the tensile bolt and the tensile stud to the two ends of the tensile testing machine respectively, set the parameters of the tensile testing machine, and perform a single-leg tensile test;

[0022] f. Remove the tension bolts and tension studs, install them on another pair of three-pillar inserts and support plates, then rotate the test frame 120°, connect the tension bolts and tension studs to both ends of the tensile testing machine, set the parameters of the tensile testing machine, and conduct a single-leg tensile test;

[0023] g. Repeat step f until three sets of tensile tests are completed.

[0024] The beneficial effects of the present invention are:

[0025] The invention overcomes the problem that the height of the three-pillar platform cannot be adjusted in the past, and adopts an adjustable nut structure to adjust the platform height, so that the platform can be more adaptable to the use conditions of the three pillars; adding a bearing structure on the platform can realize the rotation of the three pillars around the axis on the platform, thereby reducing the workload of test personnel; the three-pillar fixing plate is cleverly designed into a heart-shaped structure, so that the tension test of the three pillar legs in the three directions of the three pillars can be realized; placing a guiding and positioning structure on the platform is convenient for quickly and accurately placing the three pillars on the test tooling, thereby reducing the debugging workload when assembling the three pillars.

[0026] The present invention solves the problem that it is time-consuming and laborious to carry out a single-leg tensile test with fixed three pillars. The device improves the test efficiency of the single-leg tensile test with fixed three pillars by integrating a platform height adjustment unit, a three-pillar rotation unit, and a guiding and positioning unit, while also reducing the labor intensity of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 A top view of the present invention;

[0029] Figure 3 It is a top view of the present invention without the upper pull plate;

[0030] Figure 4 It is a side view of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the present invention without three pillars;

[0032] Figure 6 It is a schematic diagram of the structure of three pillars of the present invention;

[0033] Figure 7 A top view of the pull-up plate of the present invention;

[0034] As shown in the figure:

[0035] 1. Three-pillar body, 2. Three-pillar insert, 3. Three-pillar embedded tube, 4. Platform column, 5. Platform plate, 6. Pull-down plate, 7. Pull-up plate, 8. Support plate, 9. Stretching stud, 10. Stretching bolt, 11. Guide column, 12. Connecting screw, 13. Heart-shaped hole, 14. PTFE support block, 15. Rotating shaft, 16. Rotating motor. DETAILED DESCRIPTION

[0036] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0037] like Figures 1 to 7As shown, a three-pillar single-leg tensile test device for GIL of the present invention comprises a support platform and a test frame, wherein the support platform comprises a transverse platform plate 5 and four platform columns 4 supporting the platform plate 5, wherein the upper ends of the platform columns 4 are provided with external threads, and the external threads are provided with leveling bolts fastened to the upper and lower sides of the platform plate 5, and the leveling bolts are used to adjust the height and level of the platform plate 5.

[0038] The test frame includes a pull-down plate 6 rotatably connected to the support platform and an upper pull-up plate 7 located above the pull-down plate 6. A rotating shaft 15 is fixedly connected to the lower end of the pull-down plate 6. The rotating shaft 15 is connected to the support platform through a bearing shaft, thereby realizing the rotation connection of the entire test frame. A rotating motor 16 driving the test frame to rotate is also included, and the rotating motor 16 is connected to the rotating shaft 15.

[0039] The upper pull plate 7 is detachably fixed to the lower pull plate 6 through three support plates 8. In this embodiment, the support plate 8 is fixed to the side of the lower pull plate 6 by bolts. A connecting screw 12 is fixed to the upper end of the support plate 8. The upper pull plate 7 is connected to the connecting screw 12, and the detachable connection of the upper pull plate 7 is achieved through the upper pull plate 7 and the connecting screw 12.

[0040] The three pillars are horizontally arranged between the upper pull plate 7 and the lower pull plate 6, and the centers of the three pillars are coaxial with the rotating shaft of the lower pull plate 6. The lower end surface of the upper pull plate 7 and the upper end surface of the lower pull plate 6 are fixedly connected with a polytetrafluoroethylene support block 14 that fits the three-pillar body 1. Since the polytetrafluoroethylene support block 14 has a certain deformation ability, it does not affect the tensile test. The polytetrafluoroethylene support block 14 is connected by bolts for easy installation and replacement.

[0041] The center of the pull-down plate 6 is fixed with a guide column 11 adapted to the center hole of the three-pillar body 1, and the center of the pull-up plate 7 is provided with a circular hole for the guide column 11 to pass through. The diameter of the circular hole is slightly larger than the outer diameter of the guide column 11, and the outer diameter of the guide column 11 is slightly smaller than the center hole of the three-pillar body 1.

[0042] The pull-down plate 6 and the pull-up plate 7 are both provided with a heart-shaped hole 13 for accommodating the three-pillar embedded tube 3 to pass vertically. The heart-shaped hole 13 includes two long holes with intersecting ends. The long hole is an oblong hole and the width is equal to the diameter of the three-pillar embedded tube 3. The two long holes are respectively parallel to the axes of two adjacent three-pillar inserts 2. The tip of the heart-shaped hole 13 faces the rotating axis of the pull-down plate 6. The tip of the heart-shaped hole 13 is arc-shaped and fits with the outer circle of the three-pillar embedded tube 3.

[0043] The end of the three-pillar insert 2 is detachably connected with a stretching stud 9, and the stretching stud 9 is connected to the end threaded hole of the three-pillar insert 2 by bolts.

[0044] The support plate 8 is detachably connected with a tension bolt 10 coaxial with the opposite three-pillar insert 2. The support plate 8 is provided with a circular hole for the tension bolt 10 to pass through, and the tension bolt passes through the circular hole, leaving the bolt head inside the support plate, thereby achieving tension.

[0045] A tensile test method comprises the following steps:

[0046] a. Adjust the support platform to a suitable height and level it;

[0047] b. Use a lifting tool to lift the three pillars and place them on the pull-down plate 6, so as to support the three pillars as a whole and prevent them from being damaged;

[0048] c. The upper pull plate 7 is detachably fixed to the lower pull plate 6 to fix the three pillars, and the three-pillar embedded tube 3 passes through the heart-shaped holes 13 on the lower pull plate 6 and the upper pull plate 7;

[0049] d. Install a tension stud 9 at the end of one of the three-pillar inserts 2, and install a tension bolt 10 on the opposite support plate 8;

[0050] e. Connect the tension bolt 10 and the tension stud 9 to the two ends of the tension testing machine respectively, set the parameters of the tension testing machine, and perform a single-leg tensile test;

[0051] f. Remove the tension bolt 10 and the tension stud 9, install them on another pair of three-pillar inserts 2 and the support plate 8, then rotate the test frame 120°, connect the tension bolt 10 and the tension stud 9 to the two ends of the tensile testing machine, set the parameters of the tensile testing machine, and conduct a single-leg tensile test;

[0052] g. Repeat step f until three sets of tensile tests are completed.

[0053] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A three-pillar single-leg tensile test device for GIL, characterized by: The test frame comprises a support platform and a test frame, wherein the test frame comprises a pull-down plate (6) rotatably connected to the support platform and an upper pull-up plate (7) located above the pull-down plate (6), wherein the upper pull-up plate (7) is detachably fixedly connected to the pull-down plate (6) via three support plates (8), wherein three pillars are horizontally arranged between the upper pull-up plate (7) and the pull-down plate (6), and the centers of the three pillars are coaxial with the rotation axis of the pull-down plate (6), wherein the pull-down plate (6) and the upper pull-up plate (7) are both provided with a heart-shaped hole (13) for accommodating a three-pillar embedded tube (3) to vertically pass through, wherein the heart-shaped hole (13) comprises two long holes with intersecting ends, wherein the two long holes are respectively parallel to the axes of two adjacent three-pillar inserts (2), and the tip of the heart-shaped hole (13) faces the rotation axis of the pull-down plate (6), wherein the end of the three-pillar insert (2) is detachably connected with a tension stud (9), and the support plate (8) is detachably connected with a tension bolt (10) coaxial with the opposite three-pillar insert (2); A guide column (11) adapted to the center hole of the three-pillar body (1) is fixedly connected to the center of the lower pull plate (6), and a circular hole for the guide column (11) to pass through is opened at the center of the upper pull plate (7); A rotating shaft (15) is fixedly connected to the lower end of the pull-down plate (6), and the rotating shaft (15) is connected to the supporting platform via a bearing.

2. A three-pillar single-leg tensile test device for GIL according to claim 1, characterized in that: The lower end surface of the upper pull plate (7) and the upper end surface of the lower pull plate (6) are both fixedly connected with a tetrafluoro support block (14) that fits the three-pillar body (1).

3. A three-pillar single-leg tensile test device for GIL according to claim 1, characterized in that: The support platform comprises a transverse platform plate (5) and four platform columns (4) supporting the platform plate (5); the upper ends of the platform columns (4) are provided with external threads, and the external threads are provided with leveling bolts fastened to the upper and lower sides of the platform plate (5).

4. A three-pillar single-leg tensile test device for GIL according to claim 1, characterized in that: It also includes a rotary motor (16) for driving the test frame to rotate.

5. The three-pillar single-leg tensile test device for GIL according to claim 1, characterized in that: The tip of the heart-shaped hole (13) is arc-shaped and fits with the outer ring of the three-pillar embedded cylinder (3).

6. A three-pillar single-leg tensile test device for GIL according to claim 1, characterized in that: The support plate (8) is fixed to the side of the lower pull plate (6) by means of bolts, a connecting screw rod (12) is fixed to the upper end of the support plate (8), and the upper pull plate (7) is connected to the connecting screw rod (12).

7. A three-pillar single-leg tensile test device for GIL according to claim 1, characterized in that: The support plate (8) is provided with a circular hole through which the tension bolt (10) passes.

8. A tensile test method using the tensile test device according to any one of claims 1 to 7, characterized in that: The steps include: a. Adjust the support platform to a suitable height and level it; b. Use a lifting tool to lift the three pillars and place them on the pull-down plate (6), thereby supporting the three pillars as a whole to prevent damage to the three pillars; c. The upper pull plate (7) is detachably fixed to the lower pull plate (6) to fix the three pillars, and the three pillar embedded tubes (3) are passed through the heart-shaped holes (13) on the lower pull plate (6) and the upper pull plate (7); d. Install a tension stud (9) at the end of one of the three-pillar inserts (2), and install a tension bolt (10) on the opposite support plate (8); e. Connect the tension bolt (10) and the tension stud (9) to the two ends of the tension testing machine, set the parameters of the tension testing machine, and perform a single-leg tensile test; f. Remove the tension bolt (10) and the tension stud (9), install them on another pair of three-pillar inserts (2) and the support plate (8), then rotate the test frame 120°, connect the tension bolt (10) and the tension stud (9) to the two ends of the tensile testing machine, set the parameters of the tensile testing machine, and perform a single-leg tensile test; g. Repeat step f until three sets of tensile tests are completed.

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