Bridge anti-electric insulation board

Abstract

The present invention relates to the technical field of bridge protection devices, and discloses a bridge anti-electric insulation plate, comprising a bridge, a waterproof layer fixedly installed on the bottom of the bridge, a rigid insulation composite plate fixedly installed on the bottom of the waterproof layer, a metal component fixedly installed on the bottom of the rigid insulation composite plate, a contact wire fixedly installed on the inner surface of the metal component, a grounding wire fixedly installed on the bottom of the bridge, and a bolt threadedly installed on the bottom of the rigid insulation composite plate. The bridge anti-electric insulation plate, the rigid insulation composite plate is composed of SMC plastic and FRP polyester glass plate, and has the advantages of good organic electrical performance and long service life; the staff sticks the waterproof layer to the bottom of the bridge, the staff fixes the bolts on the rigid insulation composite plate, and fills insulating material between the bolts and the rigid insulation composite plate, the staff fixes the rigid insulation composite plate under the waterproof layer, and rotates the bolts to fix the rigid insulation composite plate and the bridge.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge protection devices, in particular to a bridge anti-electrical insulation board. Background Art

[0002] The necessity of implementing electrical surge protection during the construction of bridges spanning electrified railways. Implementing these protections allows bridge construction workers to work safely above live catenary lines and maintain normal train traffic. They also optimize bridge clearance design and reduce construction costs. The clearance heights of highway or railway overpasses on my country's railway lines vary depending on the era of their construction. With the continuous development of electrified railways, the difficulty of installing catenary systems under existing low-clearance overpasses has gradually become apparent. Typically, a drop-down method is employed to meet the requirements for catenary installation. When these measures fail to meet the insulation safety distance requirements for the catenary, reconstruction or demolition of the overpass is resorted to. However, this can impact transportation and increase the complexity and investment of the project. Therefore, a proper solution to the problem of catenary suspension under low-clearance overpasses is crucial and urgent. Choosing an economical and practical insulated plate overpass is one effective solution for installing catenary systems under ultra-low-clearance overpasses.

[0003] Existing bridge anti-electric insulation panels operate outdoors and are directly affected by atmospheric conditions. On mixed traction railway lines, they are also contaminated by oil smoke, water vapor, and coal dust. Dust particles easily adhere to the surface, causing insulation leakage. Arcing can also carbonize the surface of the insulation board, with irregular carbon marks distributed in a dendritic pattern on the surface of the insulation board, damaging the insulation.

[0004] The insulating plate is used as the insulating medium between the contact network and the ground. Due to the small space under the bridge, the contact wire may come into contact with the insulating plate and cause surface discharge;

[0005] Due to the lack of space at the bottom of the bridge, if rigid suspension is used, the insulating plate will bear the entire voltage. Due to the influence of the atmospheric environment (such as rain, fog, etc.), the electric field distribution around the contact line will be uneven, which may cause corona discharge. Surface discharge will cause the plate to continue to decompose and damage, and eventually lead to breakdown. Summary of the Invention

[0006] (1) Technical problems solved

[0007] In response to the above-mentioned shortcomings of the prior art, the present invention provides a bridge anti-electric insulation board, which can effectively solve the problems of the prior art, such as the poor arc resistance and anti-leakage trace resistance of the insulation board, the low service life of the insulation board when the insulation board is working to prevent electric shock on the surface, and the corona generated by the insulation board during operation, which will cause the insulation board to be broken down.

[0008] (2) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] The present invention discloses an anti-electric insulation board for a bridge, comprising a bridge, a waterproof layer fixedly installed on the bottom of the bridge, a rigid insulating composite board fixedly installed on the bottom of the waterproof layer, a metal component fixedly installed on the bottom of the rigid insulating composite board, a contact wire fixedly installed on the inner surface of the metal component, a grounding wire fixedly installed on the bottom of the bridge, a bolt threadedly installed on the bottom of the rigid insulating composite board, an insulating material filled between the bolt and the rigid insulating composite board, and a high-resistance semiconductor paint sprayed on the outer surface of the rigid insulating composite board.

[0011] Furthermore, the rigid insulating composite panel is composed of two pieces of SMC plastic and FRP polyester glass panels, and the two rigid insulating composite panels are bonded together using silicone rubber. The thickness of the rigid insulating composite panel is 10 mm, and the thickness of the two panels is 20 mm. After installation, the total thickness can reach 30 mm, thereby improving the mechanical strength.

[0012] Furthermore, the high-resistance semiconductor paint is made of epoxy ester covering paint and silicon carbide in a certain proportion. The number of layers of the high-resistance semiconductor paint is three, and the resistance value of the coating gradually transitions from low to high from the center to the edge of the insulating plate.

[0013] Furthermore, the rigid insulation composite board was tested for bending elasticity and tensile elasticity according to DIN53457 method, and the test results met the standards. The test results were 13×10 3 MP a and 18.1×10 3 MP a .

[0014] Furthermore, the rigid insulating composite board is subjected to a tracking resistance test according to the GB6553-86 method, and the test result is 1A3.5 level.

[0015] Furthermore, the rigid insulating composite board is subjected to a heat aging test, and the logarithm of the electric field strength of the rigid insulating composite board is linearly related to the logarithm of the life span.

[0016] Furthermore, the rigid insulation composite board was subjected to an expansion test, and the test result was 37.05×10 -6 and 15.8×10 -6 The rigid insulating composite panel was subjected to flammability and fire type tests according to GB5069.4-85, and the result showed that the fire point was 960°C.

[0017] Furthermore, the rigid insulating composite panel passed the flashover voltage and withstand voltage tests, and the withstand voltage of the rigid insulating composite panel was 55KV; the flashover voltage was 60KV, and a long electrode of Ø12×830mm was suspended parallel to the plate surface at a height of 70mm from the plate surface, and the back of the plate was the aluminum plate surface directly pressed onto the insulating plate surface as a grounding electrode. When the pressure was applied to 86KV, the air broke down at the plate end; the voltage was reduced to 80KV and applied for 5 minutes, and the insulating plate did not break down; another test method was to use a Ø25 circular electrode and place it on the insulating plate, with the back of the plate grounded. When the voltage was applied to 60KV, the air broke down; the voltage was reduced to 55KV and applied for 50 minutes, and the insulating plate did not break down.

[0018] Furthermore, the rigid insulating composite panels were subjected to a corona test, and the anti-corona measures on the test surface were effective. Three types of tests were conducted during the test:

[0019] First, make an inner circle and fix the wire clamp inside the circle; apply low-resistance semiconductor paint inside the circle, and apply high-resistance semiconductor paint on the inner wall and outer surface of the circle. The inner circle uses an elliptical frame made of 30mm thick SMC board through machining and is bonded to the insulating board with adhesive; its main function is to enclose the charged wire clamp and relatively increase the insulation thickness of the strong electric field part; after applying the semiconductor paint, the potential difference between the charged body and the surface of the insulating board is eliminated, so no surface discharge can be generated; low 103~1052; high-resistance semiconductor paint uses 9120 epoxy ester covering paint produced by our factory and carbon 10 3 ~10 5 Ω; High-resistance semiconductor paint is made of 9120 epoxy ester covering paint produced by our factory and silicon carbide in a certain proportion; the No. 1 board currently installed on site adopts the above-mentioned anti-corona measures and has three layers of outer rings;

[0020] Second, use semiconductor laminate (resistance 10 3 ~10 5 The low-resistance coating was replaced by a Ω-type coating, which was directly pressed into the insulating plate as a whole. The inner ring was still adhered to the insulating plate with adhesive and then painted with high-resistance semiconductor paint. There were also two outer rings. The main purpose of this test was to verify whether the semiconductor part and the insulating plate could be pressed into one piece during the production process. If the semiconductor part was pressed directly into the plate, the coating process could be simplified, quality could be guaranteed, and the life of the plate could be extended. The test proved that this solution was feasible.

[0021] Third, semiconductor materials with varying resistance values ​​were pressed into preforms according to the drawings. During the production of the insulation board, this preform was pressed into the center surface of the board, integrating the semiconductor and insulator components. The inner ring was eliminated, and the wire clamps were fixed directly to the preform, leaving an outer ring. This experiment aimed to simplify the production process and product structure as much as possible, reducing factors that could affect product quality while also lowering product costs and making installation and maintenance easier.

[0022] The insulation boards of the above three test schemes were subjected to corona tests by the Harbin Insulation Materials Testing Center before leaving the factory. No corona appeared in any of the three forms, indicating that the measure of eliminating potential difference by using semiconductors is feasible. The three schemes have their own advantages. The first scheme has overlapping anti-corona measures, which seems safe and reliable, but the construction is complicated, and the product quality is obviously affected by the environment and the quality of production personnel. The product structure is complex but the cost is high. The second scheme is similar to the first one, but the product is simplified, especially the third one, which cancels the inner circle, making it more lightweight.

[0023] Furthermore, a method for manufacturing a bridge anti-electrical insulation board comprises the following steps:

[0024] S1. When the mold temperature reaches the desired level, place the SMC plastic into the mold.

[0025] S2, the hydraulic press applies pressure to the mold to press it;

[0026] S3, cooling the mold to below 50°C;

[0027] S4, taking out the workpiece from the mold;

[0028] S5. Check whether the parts are qualified;

[0029] S6. Grind and spray the qualified products.

[0030] (3) Beneficial effects

[0031] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0032] 1. The present invention sprays three layers of high-resistance semiconductor paint on the outer surface of the rigid insulating board. When fixed with bolts, insulating materials are filled in the gaps to eliminate the air gaps between the charged insulating boards. The coating resistance value of the high-resistance semiconductor paint gradually transitions from low to high from the center to the edge of the rigid insulating composite board, making the electric field uniform, thereby preventing the effect of the conductor tip being discharged, and avoiding the problem of uneven electric field distribution around the contact line, generating corona discharge, and the discharged electric shock breaking through the insulating board.

[0033] 2. The present invention heats the mold to 150-160 degrees Celsius, and the pressure of the SMC plastic in the rigid insulation composite panel is 10±1mp a The SMC plastic is pressed for 30 minutes and then cooled to achieve the toughness and elasticity standards. After passing the bending elasticity test, tensile elasticity test, tracking resistance test, aging resistance test, linear expansion coefficient test, flammability test, ignition test, flashover voltage test, voltage resistance test and corona test, the insulation board produced can be used in various environments, and the service life of the insulation board is also longer than that of the same product. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0035] Figure 1 A three-dimensional structural diagram of the rigid insulating composite panel, metal parts and bolts in the present invention;

[0036] Figure 2 It is a front view of the structure of the present invention;

[0037] Figure 3 It is a step diagram of the production method of the present invention;

[0038] The numbers in the figure represent: 1. Bridge; 2. Waterproof layer; 3. Rigid insulating composite panel; 4. Metal parts; 5. Contact wire; 6. Grounding wire; 7. Bolt; 8. Insulator; 9. High-resistance semiconductor paint. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] The present invention will be further described below with reference to the embodiments.

[0041] Example 1

[0042] A bridge anti-electric insulation board of this embodiment, such as Figures 1 to 2As shown, the bridge 1 includes a waterproof layer 2 fixedly installed on the bottom of the bridge 1, a rigid insulating composite panel 3 fixedly installed on the bottom of the waterproof layer 2, a metal component 4 fixedly installed on the bottom of the rigid insulating composite panel 3, a contact wire 5 fixedly installed on the inner surface of the metal component 4, a grounding wire 6 fixedly installed on the bottom of the bridge 1, a bolt 7 threadedly installed on the bottom of the rigid insulating composite panel 3, an insulating material 8 is filled between the bolt 7 and the rigid insulating composite panel 3, and the outer surface of the rigid insulating composite panel 3 is sprayed with high-resistance semiconductor paint 9.

[0043] In this embodiment, the rigid insulating composite panel 3 is composed of SMC plastic and FRP polyester glass panel, and has the advantages of good organic electrical performance and long service life; the staff sticks the waterproof layer 2 to the bottom of the bridge 1, and the staff fixes the bolts 7 on the rigid insulating composite panel 3, and fills the insulating material 8 between the bolts 7 and the rigid insulating composite panel 3. The staff fixes the rigid insulating composite panel 3 under the waterproof layer 2 and rotates the bolts 7 to fix the rigid insulating composite panel 3 and the bridge 1; the electricity generated on the bridge is conducted to the ground from the grounding wire 6, and will not be touched by passing staff.

[0044] Example 2

[0045] The rigid insulating composite board 3 is composed of two SMC plastic and FRP polyester glass boards. The two rigid insulating composite boards 3 are bonded together using silicone rubber. The thickness of the rigid insulating composite board 3 is 10 mm, and the thickness of the composite board composed of two boards is 20 mm.

[0046] The high-resistance semiconductor paint 9 is made of epoxy ester covering paint and silicon carbide in a certain proportion. The number of layers of the high-resistance semiconductor paint 9 is three, and the resistance value of the coating gradually transitions from low to high from the center to the edge of the insulating board.

[0047] The rigid insulating composite board 3 was tested for bending elasticity and tensile elasticity according to the DIN53457 method, and the test results all met the standards.

[0048] The rigid insulating composite board 3 was subjected to a tracking resistance test according to the GB6553-86 method, and the test result was 1A3.5 level.

[0049] The rigid insulating composite board 3 is subjected to a heat aging test. The logarithm of the electric field strength of the rigid insulating composite board 3 is linearly related to the logarithm of the lifespan.

[0050] The rigid insulation composite board 3 has undergone expansion test and the test result is 37.05×10 -6 and 15.8×10 -6 The rigid insulating composite board 3 was subjected to flammability and fire type tests according to the test method GB5069.4-85, and the result showed that the fire point was 960℃.

[0051] The rigid insulating composite panel 3 passed the flashover voltage and withstand voltage tests. The withstand voltage of the rigid insulating composite panel 3 was 55KV, and the flashover voltage was 60KV.

[0052] The rigid insulating composite panel 3 was subjected to a corona test, and the anti-corona measures on the test surface were effective.

[0053] In this embodiment, the manufactured rigid insulating composite panel 3 passes the bending elasticity test, tensile elasticity test, tracking resistance test, aging resistance test, linear expansion coefficient test, flammability test, ignition test, flashover voltage test, voltage resistance test and corona test, and the data obtained meet the national standards, ensuring that the equipment can be used on the bridge without leakage and other phenomena.

[0054] Example 3

[0055] like Figure 3 As shown, a method for manufacturing a bridge anti-electric insulation board, the method steps include:

[0056] S1. When the mold temperature reaches the desired level, place the SMC plastic into the mold.

[0057] S2, the hydraulic press applies pressure to the mold to press it;

[0058] S3, cooling the mold to below 50°C;

[0059] S4, taking out the workpiece from the mold;

[0060] S5. Check whether the parts are qualified;

[0061] S6. Grind and spray the qualified products.

[0062] To sum up, the rigid insulating composite panel 3 is composed of SMC plastic and FRP polyester glass panel, and has the advantages of good organic electrical performance and long service life; the staff sticks the waterproof layer 2 to the bottom of the bridge 1, and the staff fixes the bolts 7 on the rigid insulating composite panel 3, and fills the insulating material 8 between the bolts 7 and the rigid insulating composite panel 3. The staff fixes the rigid insulating composite panel 3 under the waterproof layer 2 and rotates the bolts 7 to fix the rigid insulating composite panel 3 and the bridge 1; the electricity generated on the bridge is conducted to the ground from the grounding wire 6, and will not be touched by passing staff.

[0063] The manufactured rigid insulating composite panel 3 has passed the bending elasticity test, tensile elasticity test, tracking resistance test, aging resistance test, linear expansion coefficient test, flammability test, ignition test, flashover voltage test, voltage resistance test and corona test. The data obtained meet the national standards, ensuring that the equipment can be used on bridges without leakage and other phenomena.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A bridge anti-electric insulation board, comprising a bridge (1), characterized in that: The bottom of the bridge (1) is fixedly installed with a waterproof layer (2), the bottom of the waterproof layer (2) is fixedly installed with a rigid insulating composite board (3), the bottom of the rigid insulating composite board (3) is fixedly installed with a metal component (4), the inner surface of the metal component (4) is fixedly installed with a contact wire (5), the bottom of the bridge (1) is fixedly installed with a grounding wire (6), the bottom of the rigid insulating composite board (3) is threadedly installed with a bolt (7), the space between the bolt (7) and the rigid insulating composite board (3) is filled with an insulating material (8), the outer surface of the rigid insulating composite board (3) is sprayed with a high-resistance semiconductor paint (9), the high-resistance semiconductor paint (9) is composed of epoxy ester covering paint and silicon carbide in a certain proportion, the number of layers of the high-resistance semiconductor paint (9) is three, and the coating resistance value of the high-resistance semiconductor paint (9) gradually transitions from low to high from the center to the edge of the insulating board.

2. The bridge anti-electric insulation board according to claim 1, characterized in that: The rigid insulating composite board (3) is composed of two pieces of SMC plastic and FRP polyester glass plates. The two rigid insulating composite boards (3) are bonded together using silicone rubber. The thickness of the rigid insulating composite board (3) is 10 mm, and the thickness of the composite board composed of the two pieces is 20 mm.

3. The bridge anti-electric insulation board according to claim 1, characterized in that: The rigid insulating composite board (3) was subjected to bending elasticity and tensile elasticity tests according to the DIN53457 method, and the test results all met the standards.

4. The bridge anti-electric insulation board according to claim 1, characterized in that: The rigid insulating composite board (3) was subjected to a tracking resistance test according to the GB6553-86 method, and the test result was 1A3.5 level.

5. The bridge anti-electrical insulation board according to claim 1, characterized in that: The rigid insulating composite board (3) is subjected to a heat aging test, and the logarithm of the electric field strength of the rigid insulating composite board (3) is linearly related to the logarithm of the lifespan.

6. The bridge anti-electric insulation board according to claim 1, characterized in that: The rigid insulating composite board (3) was subjected to an expansion test, and the test results were 37.05×10-6 and 15.8×10-6. The rigid insulating composite board (3) was subjected to a flammability and ignition type test, and the test method was GB5069.4-85, and the result was that the ignition point was 960°C.

7. The bridge anti-electric insulation board according to claim 1, characterized in that: The rigid insulation composite panel (3) passes the flashover voltage and withstand voltage tests. The withstand voltage of the rigid insulation composite panel (3) is 55KV; the flashover voltage is 60KV.

8. The bridge anti-electrical insulation board according to claim 1, characterized in that: The rigid insulating composite panel (3) has been subjected to a corona test, and the anti-corona measures on the test surface have been effective.

9. A method for manufacturing a bridge anti-electrical insulation board, the method using a bridge anti-electrical insulation board according to any one of claims 1 to 8, characterized in that: The method steps include: S1. When the mold temperature reaches the desired level, place the SMC plastic into the mold. S2, the hydraulic press applies pressure to the mold to press it; S3, cooling the mold to below 50°C; S4, taking out the workpiece from the mold; S5. Check whether the parts are qualified; S6. Grind and spray the qualified products.

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