Composite cross arm with maintenance position

Abstract

The invention provides a composite cross arm with a maintenance position, which comprises a core rod, an insulating umbrella skirt and an insulating sheath, the insulating umbrella skirt and the insulating sheath are integrally formed and alternately arranged outside the core rod, and the insulating sheath is made of silicon rubber; the outer surface of the insulating sheath is provided with a maintenance position, and the maintenance position is provided with an anti-skid layer. The anti-skid layer is prepared from the following raw materials in parts by mass: 100 parts of polyurethane elastomer, 50-60 parts of silica sol modified silica sand, 8-10 parts of an auxiliary agent and 10-15 parts of a curing agent. According to the technical scheme, the maintenance position of the insulating sheath is covered with the anti-skid layer, the abrasion resistance and the anti-skid performance of the maintenance position are improved, and therefore the durability of the cross arm and the safety of maintenance operation are improved.

Description

Technical Field

[0001] The present application relates to the technical field of cross-arm power transmission equipment, and in particular to a composite cross-arm with an inspection position. Background Art

[0002] Composite crossarms are a type of equipment widely used in power systems, mainly used to support and protect transmission lines. Compared with traditional crossarms, composite crossarms are made of polymer materials.

[0003] When a transmission line maintenance tower is being repaired, aerial work is required, so the treadable composite cross arm in the prior art can provide a treading position for maintenance personnel.

[0004] For example, patent application publication CN215632091U discloses a treadable composite crossarm, wherein the outer surface of the core rod is covered with a plurality of silicone rubber sheath sheds and a plurality of hard resin sheath sheds. In this solution, the length of the hard resin sheath shed is only set to the average foot length for easy treading by personnel, and no treatment is done on the hard resin sheath shed. This solution lacks anti-slip measures and has poor safety.

[0005] Patent application publication CN109577736A discloses a UHV composite insulating crossarm that can be stepped on for operation and maintenance. This solution also only sets the length of the silicone rubber shed and the shed that can be stepped on. It conforms to the length of an adult's stride, is convenient for operation and maintenance personnel to step on, and can step on the shed. This solution also does not do any treatment on the composite insulating crossarm, lacks anti-slip measures, and has poor safety.

[0006] Most of the existing composite cross arms do not have maintenance positions, and cannot be stepped on by maintenance personnel. A few cross arms have maintenance positions but lack wear resistance and anti-slip properties, resulting in reduced safety for maintenance personnel when working at heights.

[0007] On the other hand, the umbrella skirt of the composite crossarm is generally made of silicone rubber, while the polymer anti-slip coating in the prior art generally uses polyurethane material as the matrix of the anti-slip material. However, due to the poor compatibility between silicone rubber and polyurethane, the bonding force of the polyurethane protective coating is relatively small after being coated on the silicone rubber surface, which affects the reliability of the composite crossarm maintenance position. Summary of the invention

[0008] The technical problem to be solved by the present invention is that the existing treadable composite crossarm has no anti-slip and wear-resistant treatment on the silicone rubber surface, resulting in poor safety.

[0009] In order to solve the above problems, the present invention provides a composite crossarm with a maintenance position, comprising: a core rod and an integrally formed insulating shed and an insulating sheath alternately arranged outside the core rod, the insulating sheath being made of silicone rubber; an maintenance position is arranged on the outer surface of the insulating sheath, and an anti-slip layer is arranged at the maintenance position; the raw materials of the anti-slip layer include, by mass: 100 parts of polyurethane elastomer, 50 parts to 60 parts of silica sol modified silica sand, 8 parts to 10 parts of additives, and 10 parts to 15 parts of curing agent.

[0010] Through the above technical solution, an anti-skid layer is covered on the maintenance position of the insulating sheath, which improves the wear resistance and anti-skid properties of the maintenance position, thereby improving the durability of the crossarm and the safety of the maintenance work. In the above solution, the polyurethane elastomer is used as the base material to provide good elasticity and wear resistance. The addition of silica sol-modified silica sand significantly improves the roughness and wear resistance of the anti-skid layer, thereby enhancing the anti-skid effect. The present invention improves the compatibility of silica sand and polyurethane elastomer by mixing silica sol-modified silica sand with polyurethane elastomer, so that the silica sand cannot be separated from the polyurethane elastomer during long-term trampling.

[0011] Optionally, the preparation method of silica sol modified silica sand includes: dispersing silica sand in silica sol and soaking it for not less than 2 hours, taking it out after soaking, and drying it at an environment not higher than 70° C. to obtain silica sol modified silica sand.

[0012] In the above scheme, silica sand is dispersed in silica sol, so that the silica sand particles are fully soaked in silica sol so that the silica sol can wrap the outer layer of the silica sand particles. After soaking, the silica sand is fished out of the silica sol. At this time, the surface of the silica sand particles is covered with a layer of silica sol. The excess water and unbound silica sol on the surface of the silica sand particles are removed by drying, making the silica sol modified silica sand more stable. At the same time, the lower temperature can prevent the silica sol from denaturing or decomposing at high temperature, which affects the modification effect.

[0013] In order to improve the weather resistance of the anti-slip layer, optionally, the auxiliary agent includes at least one of an antioxidant, a flame retardant, and an ultraviolet absorber.

[0014] Optionally, the method for preparing the coating of the anti-slip layer comprises:

[0015] dissolving polyurethane elastomer powder in a solvent to obtain a polyurethane solution having a solid content of not less than 65%;

[0016] The silica sol modified silica sand and the polyurethane solution are fully mixed to obtain the anti-skid layer liquid material;

[0017] Within no more than 1 hour before the anti-skid layer liquid is coated on the insulating sheath, the curing agent and the anti-skid layer liquid are fully mixed to obtain the anti-skid layer coating.

[0018] In order to enhance the bonding strength between the anti-slip layer and the insulating sheath, as an improvement, a rubber layer is further provided between the anti-slip layer and the insulating sheath. The raw materials of the rubber layer include at least silicone rubber powder and polyurethane elastomer powder. Preferably, the mass ratio of silicone rubber powder to polyurethane elastomer powder is 1:0.8-1.2.

[0019] In view of the poor compatibility and weak bonding force of the silicone rubber and polyurethane anti-skid layers in the composite crossarm, the above solution sets a rubber layer between the anti-skid layer and the insulating sheath. The rubber layer is made of a mixture of silicone rubber powder and polyurethane elastomer powder. The silicone rubber powder is made of the same material as the insulating sheath. The polyurethane elastomer is the main base material of the anti-skid layer. The bonding force of the rubber can be improved by mixing the above materials.

[0020] As a further improvement, the raw materials of the rubber layer also include glass fiber chips. Preferably, the mass of the glass fiber chips accounts for no more than 32% of the total mass of the rubber layer.

[0021] Glass fiber crumbs are a high-strength, high-modulus fiber material. Glass fiber crumbs have good compatibility with silicone rubber and polyurethane. Adding them to the rubber layer can significantly improve the strength of the rubber layer while maintaining good elasticity and toughness. In addition, the addition of glass fiber crumbs can also improve the tear strength and impact resistance of the rubber layer, further improving the performance of the rubber area.

[0022] More preferably, the structure of the rubber layer is sequentially: a silicone rubber area, a silicone rubber-polyurethane mixed area, and a polyurethane rubber area from the insulating sheath to the anti-slip layer, and the silicone rubber-polyurethane mixed area is mixed with glass fiber scraps.

[0023] In this solution, the silicone rubber compound area serves as a transition layer between the insulating sheath and the rubber layer. The silicone rubber compound area can maintain good insulation performance and compatibility with the insulating sheath, ensuring a close bond between the two.

[0024] The silicone rubber-polyurethane mixed area combines the advantages of silicone rubber and polyurethane, and the addition of glass fiber chips significantly improves strength and wear resistance. The existence of the mixed area enables the rubber layer to have higher strength and tear resistance while maintaining good elasticity.

[0025] The polyurethane rubber area serves as a transition layer between the anti-slip layer and the rubber layer. The polyurethane rubber area can provide good elasticity and wear resistance, ensure close bonding with the anti-slip layer, and improve the overall durability of the composite crossarm.

[0026] The layered structure design enables the rubber layer to fully exert the advantages of silicone rubber and polyurethane, while the addition of glass fiber chips significantly improves the performance of the rubber layer.

[0027] Optionally, the coating density of the anti-slip layer is not less than 1.8 g / cm 2 The coating density of the rubber layer is not less than 0.25g / cm 2 .

[0028] Optionally, the method of applying the anti-slip layer to the insulating sheath is:

[0029] After cleaning the surface of the insulating sheath, roughening the surface of the insulating sheath;

[0030] The anti-slip layer coating is applied to the surface of the insulating sheath, and after drying, a composite cross arm with an inspection position is obtained.

[0031] A preferred solution is to apply the anti-slip layer to the insulating sheath by:

[0032] After cleaning the surface of the insulating sheath, roughening the surface of the insulating sheath;

[0033] Applying the rubber material of the rubber material layer to the surface of the insulating sheath;

[0034] The anti-skid coating is applied to the outer layer of the rubber material of the rubber material layer, and after drying, a composite cross arm with an inspection position is obtained.

[0035] The technical effects of this application are:

[0036] 1. The present invention covers the maintenance position of the insulating sheath with an anti-skid layer, which improves the wear resistance and anti-skid properties of the maintenance position, thereby improving the durability of the crossarm and the safety of the maintenance work. In the above scheme, the polyurethane elastomer is used as the base material, providing good elasticity and wear resistance. The addition of silica sol-modified silica sand significantly improves the roughness and wear resistance of the anti-skid layer, thereby enhancing the anti-skid effect. The present invention improves the compatibility of silica sand and polyurethane elastomer by mixing silica sol-modified silica sand with polyurethane elastomer, so that the silica sand cannot be separated from the polyurethane elastomer during long-term trampling.

[0037] 2. Further, in the preferred embodiment, the present invention disperses silica sand in silica sol, so that the silica sand particles are fully infiltrated in the silica sol, so that the silica sol can wrap the outer layer of the silica sand particles. After soaking, the silica sand is fished out of the silica sol. At this time, the surface of the silica sand particles is covered with a layer of silica sol. The excess water and unbound silica sol on the surface of the silica sand particles are removed by drying, so that the silica sol-modified silica sand is more stable. At the same time, the lower temperature can prevent the silica sol from being denatured or decomposed at high temperature, affecting the modification effect.

[0038] 3. Further, in the preferred embodiment, the present invention aims at the problem that the silicone rubber and the polyurethane anti-skid layer in the composite crossarm have poor compatibility and weak bonding strength. The above embodiment sets a rubber layer between the anti-skid layer and the insulating sheath. The rubber layer is made of a mixture of silicone rubber powder and polyurethane elastomer powder. The silicone rubber powder is made of the same material as the insulating sheath. The polyurethane elastomer is the main matrix material of the anti-skid layer. The bonding strength of the rubber can be improved by mixing the above materials.

[0039] 4. Furthermore, in a preferred embodiment, the present invention adds glass fiber crumbs to the rubber layer. The glass fiber crumbs have good compatibility with both silicone rubber and polyurethane, and can significantly improve the performance of the rubber layer.

[0040] 5. Furthermore, in the preferred embodiment, the present invention adopts a layered structure design so that the rubber layer can fully exert the advantages of silicone rubber and polyurethane, and the addition of glass fiber chips significantly improves the performance of the rubber layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of a composite cross arm with an inspection position in an embodiment of the present invention.

[0042] Figure 2 yes Figure 1 Enlarged view of point a in the middle.

[0043] Figure 3 It is a schematic diagram of the provision of an anti-slip layer at the composite cross arm maintenance position in an embodiment of the present invention.

[0044] Figure 4 This is another schematic diagram of the provision of an anti-slip layer at the composite cross arm maintenance position in an embodiment of the present invention.

[0045] Figure 5 This is another schematic diagram of the provision of an anti-slip layer at the composite cross arm maintenance position in an embodiment of the present invention.

[0046] Description of reference numerals:

[0047] 1. Mandrel; 2. Insulating shed; 3. Insulating sheath; 4. Rubber layer; 5. Anti-skid layer; 401. Glass fiber shavings; 41. Silicone rubber rubber area; 42. Silicone rubber-polyurethane mixed area; 43. Polyurethane rubber area; 51. Silica sol modified silica sand. DETAILED DESCRIPTION

[0048] The following will be combined with the attached Figures 1 to 5 The embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the protection scope of the present application.

[0049] 1. Preparation example of anti-slip coating:

[0050] The silica sand is dispersed in the silica sol and soaked for no less than 2 hours, then taken out and dried at an environment not higher than 70°C to obtain silica sol modified silica sand. The silica sol used in the following examples is M3010 silica sol;

[0051] At 85° C., dissolving 100 parts of polyurethane elastomer powder in DMF solvent to obtain a polyurethane solution having a solid content of not less than 65%;

[0052] Fully mixing 50-60 parts of silica sol modified silica sand, polyurethane solution and 8-10 parts of additives consisting of antioxidant, flame retardant and ultraviolet absorber to obtain anti-skid layer liquid;

[0053] Within no more than 1 hour before the anti-skid layer liquid is coated on the insulating sheath 3, 10 to 15 parts of curing agent are fully mixed with the anti-skid layer liquid to obtain the anti-skid layer coating.

[0054] Example 1-1

[0055] S11, dispersing 50 parts of silica sand in 60 parts of M3010 silica sol and soaking them for 2 hours, taking them out after soaking, and drying them at 65° C. to obtain 51.2 parts of silica sol-modified silica sand;

[0056] S12, dissolving 100 parts of polyurethane elastomer powder in 40 parts of DMF solvent to obtain 140 parts of polyurethane solution with a solid content of about 71%;

[0057] S13, 51.2 parts of silica sol modified silica sand, 140 parts of polyurethane solution, 3 parts of antioxidant, 3 parts of flame retardant, and 2 parts of ultraviolet absorber are fully mixed to obtain an anti-slip layer liquid material;

[0058] S14. Within no more than 1 hour before applying the anti-skid layer liquid material to the insulating sheath 3, 15 parts of the curing agent and the anti-skid layer liquid material are fully mixed to obtain an anti-skid layer coating.

[0059] Example 1-2

[0060] The difference between Example 1-2 and Example 1-1 is that the control conditions of each step are different, see Table 1 for details.

[0061] Comparative Example 1-1

[0062] The difference between Comparative Example 1-1 and Example 1-1 is that the silica sand used in Comparative Example 1-1 is not modified, see Table 1 for details.

[0063] Table 1

[0064]

[0065] 2. Example of rubber layer preparation:

[0066] The raw materials of the rubber layer 4 as shown in Figure 3 at least include silicone rubber powder and polyurethane elastomer powder. Preferably, the mass ratio of silicone rubber powder to polyurethane elastomer powder is 1:0.8-1.2. The preparation of the rubber layer includes: dissolving 100 parts of silicone rubber powder and 80-120 parts of polyurethane elastomer powder in DMF solvent at 85°C to obtain a rubber with a solid content of not less than 70%. In the following embodiments, the silicone rubber used is 110-2 type methyl vinyl silicone rubber;

[0067] like Figure 4 The preferred scheme shown is: at 85°C, 100 parts of silicone rubber powder and 80 to 120 parts of polyurethane elastomer powder are dissolved in DMF solvent, and glass fiber chips are added and mixed thoroughly to obtain a rubber material with a solid content of not less than 70%, wherein the mass of the glass fiber chips 401 accounts for no more than 32% of the total mass of the rubber layer 4.

[0068] like Figure 5 The schematically preferred solution is as follows: the structure of the rubber layer 4 from the insulating sheath 3 to the anti-slip layer 5 is: a silicone rubber rubber area 41, a silicone rubber rubber-polyurethane mixed area 42, and a polyurethane rubber area 43, wherein the silicone rubber rubber-polyurethane mixed area 42 is mixed with glass fiber scraps 401.

[0069] The preparation method is:

[0070] Preparation of silicone rubber liquid: dissolving 100 parts of silicone rubber powder in DMF solvent at 85°C to obtain a rubber material with a solid content of not less than 70%;

[0071] Preparation of silicone rubber compound-polyurethane mixed zone glue liquid: at 85°C, dissolve 100 parts of silicone rubber powder and 80 to 120 parts of polyurethane elastomer powder in DMF solvent, and add glass fiber chips and mix thoroughly to obtain a rubber compound with a solid content of not less than 70%, wherein the mass of the glass fiber chips accounts for no more than 32% of the total mass of the rubber layer 4.

[0072] Preparation of polyurethane zone glue: at 85° C., dissolve 80 to 120 parts of polyurethane elastomer powder in DMF solvent to obtain a glue having a solid content of not less than 70%.

[0073] Example 2-1

[0074] 100 parts of silicone rubber powder and 80 parts of polyurethane elastomer powder were dissolved in 75 parts of DMF solvent to obtain a silicone rubber-polyurethane glue solution with a solid content of about 70%.

[0075] Example 2-2 to Example 2-3

[0076] The difference between Example 2-2 to Example 2-3 and Example 2-1 is that the control conditions of each step are different, see Table 2 for details.

[0077] Embodiment 2-4

[0078] The difference between Example 2-4 and Example 2-1 to Example 2-3 is that glass fiber scraps are also mixed in Example 2-4, as follows:

[0079] 100 parts of silicone rubber powder and 100 parts of polyurethane elastomer powder were dissolved in 75 parts of DMF solvent, and 65 parts of glass fiber chips were added and mixed thoroughly to obtain a silicone rubber-glass fiber-polyurethane adhesive with a solid content of 73%, wherein the mass of the glass fiber chips accounted for 31.5% of the total mass of non-volatile substances.

[0080] Embodiment 2-5

[0081] The difference between Example 2-5 and Example 2-4 is that the control conditions of each step are different, see Table 2 for details.

[0082] Table 2 Control conditions of each step of Example 2-1 to Example 2-5

[0083]

[0084]

[0085] Embodiment 2-6

[0086] The difference between Example 2-6 and Example 2-1 to Example 2-5 is that the adhesive liquid is a layered composite adhesive, specifically comprising:

[0087] Preparation of silicone rubber compound area glue solution: 100 parts of silicone rubber powder was dissolved in 40DMF solvent to obtain a compound with a solid content of 71%;

[0088] Preparation of silicone rubber-polyurethane mixed rubber zone adhesive liquid: The preparation method is the same as that of Example 2-4 to prepare silicone rubber-glass fiber-polyurethane adhesive liquid.

[0089] Preparation of polyurethane rubber solution: 100 parts of polyurethane elastomer powder was dissolved in 40 parts of DMF solvent to obtain a rubber with a solid content of 71%.

[0090] 3. Coating an anti-slip layer on the surface of the insulating sheath 3:

[0091] One implementation method is: after cleaning the surface of the insulating sheath 3, the surface of the insulating sheath 3 is roughened;

[0092] The anti-slip layer 5 is coated on the surface of the insulating sheath 3 and dried to obtain a composite cross arm with an inspection position.

[0093] The preferred implementation is:

[0094] After cleaning the surface of the insulating sheath 3, roughening the surface of the insulating sheath 3;

[0095] Applying a rubber layer 4 to the surface of the insulating sheath 3;

[0096] The anti-skid layer 5 is applied to the rubber layer 4 and dried to obtain a composite cross arm with an inspection position.

[0097] In the above embodiment, the coating density of the anti-slip layer 5 is not less than 1.8 g / cm 2 The coating density of the rubber layer 4 is not less than 0.25g / cm 2 .

[0098] Example 3-1

[0099] After cleaning the surface of the insulating sheath 3, the surface of the insulating sheath 3 is roughened so that the surface roughness is not less than Ra 6.3 μm;

[0100] The anti-slip coating obtained in Example 1-1 is applied to the surface of the insulating sheath 3 at a coating density of 1.8 g / cm 2 After drying, a composite cross arm with maintenance position is obtained.

[0101] Example 3-2

[0102] The difference between Example 3-2 and Example 3-1 is that the control conditions of each step are different, see Table 3 for details.

[0103] Example 3-3

[0104] After cleaning the surface of the insulating sheath 3, the surface of the insulating sheath 3 is roughened so that the surface roughness is not less than Ra 6.3 μm;

[0105] The rubber obtained in Example 2-1 is applied to the surface of the insulating sheath 3 at a coating density of 0.25 g / cm2;

[0106] The anti-slip coating obtained in Example 1-2 is applied to the rubber layer 4, and the coating density is 1.8 g / cm 2 After drying, a composite cross arm with maintenance position is obtained.

[0107] Examples 3-4 to 3-9, Comparative Example 3-1

[0108] The difference between Example 3-4 to Example 3-9, Comparative Example 3-1 and Example 3-3 is that the control conditions of each step are different, see Table 3 for details.

[0109] Comparative Example 3-2: No anti-slip layer was provided at the maintenance location.

[0110] Table 3 Control conditions of each step of Example 3-1 to Comparative Example 3-2

[0111]

[0112] like Figure 1-2 The present invention illustrates a composite cross arm with a maintenance position, which includes a core rod 1 and an integrally formed insulating shed 2 and an insulating sheath 3 alternately arranged outside the core rod 1, wherein the insulating sheath 3 is made of silicone rubber; an maintenance position is arranged on the outer surface of the insulating sheath 3, and an anti-slip layer 5 is arranged at the maintenance position.

[0113] The mechanical properties of the composite cross arm inspection position obtained in Example 3-1 to Comparative Example 3-2 were tested.

[0114] The friction coefficient test method is carried out in accordance with the national standard GB / T 9263-2020.

[0115] The bonding strength test method is: use a blade to cut off the insulation sheath 3, rubber layer, and anti-slip layer molding block of the 5cm×5cm maintenance area, fix the insulation sheath substrate at one end and the anti-slip layer at the other end on the peeling test platform, slowly tighten, continuously stretch, perform a tensile peeling test, observe and record the bonding cracking, and evaluate the bonding strength value. The bonding strength test results are shown in Table 4.

[0116] The silica sand peeling strength is used to test the bonding strength between silica sand and polyurethane. Since the bonding strength between silica sand and polyurethane is necessarily smaller than the tensile strength of polyurethane, it is possible to judge whether the silica sand and polyurethane are peeled off by observing the sudden change in the tensile force of the anti-slip layer. The test method is: use a blade to cut a 5cm×5cm anti-slip layer molding block, continuously stretch it on the peeling test platform, perform a tensile peeling test, and observe the peeling of silica sand and polyurethane. The silica sand peeling strength test results are shown in Table 4.

[0117] Table 4 Mechanical properties of the composite cross arm with maintenance position obtained in Example 3-1 to Comparative Example 3-2

[0118]

[0119] By comparing the above-mentioned embodiments 3-1 to 3-9 with the comparative example 3-2, it can be seen that the above-mentioned embodiments are provided with an anti-slip layer 5 at the maintenance position, which can significantly improve the friction coefficient of the maintenance position.

[0120] By comparing the above Examples 3-1 to 3-9 with Comparative Example 3-1, it can be seen that the use of silica sol to modify silica sand can significantly improve the compatibility and bonding ability of silica sand with polyurethane.

[0121] By comparing the above-mentioned embodiments 3-1 to 3-2 with embodiments 3-3 to 3-9, it can be seen that providing a rubber layer between the anti-slip layer and the insulating sheath can significantly improve the bonding force of the anti-slip layer on the insulating sheath.

[0122] By comparing the above Examples 3-3 to 3-5 with Examples 3-6 to 3-7, it can be seen that adding glass fiber scraps to the rubber compound can further enhance the bonding strength of the anti-slip layer on the insulating sheath.

[0123] By comparing the above-mentioned Examples 3-3 to 3-7 with Examples 3-8 to 3-9, it can be seen that by setting the adhesive material as a layered adhesive, the bonding force of the anti-slip layer on the insulating sheath can be further improved.

[0124] The composite cross arm with maintenance position obtained according to the above embodiment of the present invention can meet the following voltage level and tower type requirements by adjusting the cross arm size according to relevant standard regulations:

[0125] 35kV: gate tower, upper letter type;

[0126] 110kV: gate tower, upper letter type;

[0127] 220kV: gate-type tower, up-shaped tower, V-shaped tower;

[0128] 330kV: portal tower, V-type tower;

[0129] 500kV: portal tower.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A composite cross arm with an inspection position, characterized in that: include: A core rod (1) and an integrally formed insulating shed (2) and an insulating sheath (3) arranged alternately outside the core rod (1), wherein the insulating sheath (3) is made of silicone rubber; An inspection position is arranged on the outer surface of the insulating sheath (3), and an anti-slip layer (5) is arranged at the inspection position; The raw materials of the anti-slip layer (5) include, by weight: 100 parts of polyurethane elastomer, 50 to 60 parts of silica sol-modified silica sand, 8 to 10 parts of auxiliary agent, and 10 to 15 parts of curing agent.

2. The composite cross arm with maintenance position according to claim 1, characterized in that: The preparation method of the silica sol modified silica sand comprises: The silica sand is dispersed in the silica sol and soaked for no less than 2 hours, taken out after soaking, and dried at an environment not higher than 70° C. to obtain silica sol-modified silica sand.

3. The composite cross arm with maintenance position according to claim 1, characterized in that: The auxiliary agent includes at least one of an antioxidant, a flame retardant, and an ultraviolet absorber.

4. The composite cross arm with maintenance position according to any one of claims 1 to 4, characterized in that: The preparation method of the coating of the anti-slip layer (5) comprises: dissolving polyurethane elastomer powder in a solvent to obtain a polyurethane solution having a solid content of not less than 65%; The silica sol-modified silica sand is fully mixed with the polyurethane solution to obtain an anti-slip layer liquid material; Within no more than 1 hour before the anti-slip layer liquid is applied to the insulating sheath (3), the curing agent is fully mixed with the anti-slip layer liquid to obtain an anti-slip layer coating.

5. The composite cross arm with maintenance position according to claim 1, characterized in that: A rubber layer (4) is also provided between the anti-slip layer (5) and the insulating sheath (3), and the raw materials for preparing the rubber layer (4) include at least silicone rubber powder and polyurethane elastomer powder. Preferably, the mass ratio of the silicone rubber powder to the polyurethane elastomer powder is 1:0.8-1.

2.

6. The composite cross arm with maintenance position according to claim 5, characterized in that: The raw materials of the rubber layer (4) further include glass fiber scraps (401). Preferably, the mass of the glass fiber scraps (401) accounts for no more than 32% of the total mass of the rubber layer (4).

7. The composite cross arm with maintenance position according to claim 6, characterized in that: The structure of the rubber layer (4) is, from the insulating sheath (3) to the anti-slip layer (5), a silicone rubber rubber area (41), a silicone rubber rubber-polyurethane mixed area (42), and a polyurethane rubber area (43), wherein the silicone rubber rubber-polyurethane mixed area (42) is mixed with glass fiber scraps (401).

8. The composite cross arm with maintenance position according to claim 1, characterized in that: The coating density of the anti-slip layer (5) is not less than 1.8 g / cm 2 The coating density of the rubber layer (4) is not less than 0.25 g / cm 2 .

9. The composite cross arm with maintenance position according to claim 4, characterized in that: The method of applying the anti-slip layer to the insulating sheath (3) is: After cleaning the surface of the insulating sheath (3), roughening the surface of the insulating sheath (3); The anti-slip coating is applied to the surface of the insulating sheath (3), and after drying, a composite cross arm with an inspection position is obtained.

10. The composite cross arm with maintenance position according to claim 5, characterized in that: The method of applying the anti-slip layer to the insulating sheath (3) is: After cleaning the surface of the insulating sheath (3), roughening the surface of the insulating sheath (3); Applying the rubber of the rubber layer (4) to the surface of the insulating sheath (3); The anti-slip coating (5) is applied to the outer layer of the rubber material of the rubber material layer (4), and after drying, a composite cross arm with an inspection position is obtained.

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