Nuclear power hydraulic oil pipe and preparation method thereof

Abstract

The invention belongs to the technical field of nuclear power hoses, and particularly relates to a nuclear power hydraulic oil pipe and a preparation method thereof.The nuclear power hydraulic oil pipe comprises framework layers and rubber materials, the rubber materials comprise inner rubber, middle rubber and outer rubber, the middle rubber is laid between the two framework layers, the inner rubber is laid in the framework layers, and the outer rubber is laid outside the framework layers; the steel wires of the framework layers are matched at different arrangement angles, the angle of the steel wire of the first framework layer is 54.2 degrees, and the angle of the steel wire of the second framework layer is 55.6 degrees. The hydraulic oil pipe is resistant to hot oil, nuclear radiation and deflection, the pulse resistance of the hose is more excellent due to the arrangement of the framework layer, and the service life of a product is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power hoses, and in particular relates to a nuclear power hydraulic oil pipe and a preparation method thereof. Background Art

[0002] During the transmission process of the hydraulic hose, the liquid pressure in the tube will repeatedly increase or decrease suddenly, thus constituting frequent pressure shocks on the hydraulic hose. Hydraulic hoses that are in dynamic fatigue for a long time are prone to blistering, rupture, and loosening and leakage of hose joints, especially the joints of the hydraulic hoses in the buckled state. Under the high-frequency impact of the hydraulic oil in the tube and the working vibration of the machine itself, the rubber inside the joints bears concentrated stress in all directions, causing alternating straightening force and fatigue damage to the hose. In addition, during operation, the hydraulic system heats up the oil due to power loss, and the influence of the working environment temperature (especially in summer) can cause the oil temperature to rise sharply. The higher the oil temperature, the easier it is for the rubber to age, the worse the elasticity, the lower the strength and sealing performance, and the hose will burst quickly. According to the barrel theory, the pressure bearing capacity and dynamic fatigue resistance of the hydraulic hose determine the service life of the entire hydraulic device.

[0003] Due to the particularity of the working environment, nuclear power hoses need to have the characteristics of high pressure resistance, high temperature resistance, radiation resistance, and long life. The product life is very high, and the general life is required to be more than ten years.

[0004] Therefore, specific selection of hose materials, structural design, and preparation methods are required. Summary of the invention

[0005] The purpose of the present invention is to provide a nuclear power hydraulic oil pipe and a preparation method thereof. The hydraulic oil pipe is resistant to hot oil, nuclear radiation and bending. The provision of a skeleton layer makes the pulse resistance of the hose more excellent and increases the service life of the product.

[0006] The technical solution to achieve the purpose of the present invention is:

[0007] A nuclear power hydraulic oil pipe comprises: a skeleton layer and a rubber material, wherein the rubber material comprises an inner rubber material, a middle rubber material and an outer rubber material, wherein the middle rubber material is laid between two skeleton layers, the inner rubber material is laid inside the skeleton layer, and the outer rubber material is laid outside the skeleton layer; steel wires of each skeleton layer are arranged at different angles, wherein the angle of the steel wires of the first skeleton layer is 54.2°, and the angle of the steel wires of the second skeleton layer is 55.6°.

[0008] The rubber compound formula comprises hydrogenated butyronitrile and condensed brominated acenaphthylene.

[0009] The inner glue, by weight, comprises:

[0010]

[0011] The middle glue, by weight, comprises:

[0012]

[0013]

[0014] The outer glue, by weight, comprises:

[0015]

[0016]

[0017] A method for preparing a nuclear power hydraulic oil pipe, the method comprising:

[0018] Step 1, rubber compound preparation: according to the rubber compound formula, mixing, heat refining and vulcanization are carried out to obtain the rubber compound;

[0019] Step 2, hose forming: squeeze out the rubber material, weave the steel wire skeleton layer, use the soft core method to wrap the nylon water cloth for vulcanization, and obtain the nuclear power hydraulic oil hose.

[0020] The step 1 is specifically as follows:

[0021] Step 1.1, thinly pass the raw rubber on an open mixing mill;

[0022] Step 1.2, loosen the roller distance, add small materials in order, and when all the small materials are eaten up, add the reinforcing agent and softener in batches, add the compounding agent and the vulcanization system, and when all are eaten up, adjust the roller distance and pass the thin pass;

[0023] Step 1.3, adjust the roller distance, make 5 triangle packages and 3 rolls, cool the sheets down, and obtain the test sheets;

[0024] Step 1.4: vulcanize the test piece on a flat vulcanizer to obtain a rubber compound.

[0025] In the step 1.1, the thin-pass roller spacing is 0.5-0.8 mm, and the time is 3-4 min; in the step 1.2, the roller spacing is relaxed to 2-3 mm, the thin-pass roller spacing is 0.5-0.8 mm, and the thin-pass is performed 3 times; in the step 1.3, the roller spacing is adjusted to 2-3 mm; in the step 1.4, the vulcanization conditions are 151° C.×60 min.

[0026] The step 2 specifically comprises: pressing inner rubber out of the soft core, weaving the outer layer of the inner rubber, weaving two layers of steel wire skeleton layers, laying the middle rubber between the two skeleton layers, and coating the outer rubber on the outside of the skeleton layer to obtain a hose; wrapping the hose with nylon water cloth to tighten the hose, vulcanize it, untie the water cloth, remove the core, inspect it, and obtain a nuclear power hydraulic oil hose.

[0027] The beneficial technical effects of the present invention are:

[0028] 1. The nuclear power hydraulic oil pipe provided by the present invention has excellent oil resistance, good fatigue resistance, pulse resistance, high tensile stress and tear resistance, small stress relaxation, good process performance and high physical and mechanical properties, and also has excellent flame retardant and radiation resistance.

[0029] 2. The nuclear power hydraulic oil pipe provided by the present invention is wear-resistant, aging-resistant (ozone, hot air), has good adhesion and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a nuclear power hydraulic oil pipe provided by the present invention;

[0031] Figure 2 The present invention provides a flow chart of a method for preparing a nuclear power hydraulic oil pipe.

[0032] In the figure: 1-inner rubber layer, 2-middle rubber layer, 3-skeleton layer, 4-outer rubber layer. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1 As shown, a nuclear power hydraulic oil pipe provided by the present invention includes: a skeleton layer and a rubber material, wherein the rubber material includes an inner rubber, a middle rubber and an outer rubber, the middle rubber is laid between two skeleton layers, the inner rubber is laid inside the skeleton layer, and the outer rubber is laid outside the skeleton layer.

[0035] The steel wires of each skeleton layer of the nuclear power hydraulic oil pipe body are arranged at different angles, and the angle of the first skeleton layer steel wire is 54.2°, and the angle of the second skeleton layer steel wire is 55.6°. When designing the hose, the nuclear power hydraulic oil pipe body uses steel wires from different manufacturers to construct the skeleton layer, and uses different angles to keep the compressive deformation at about -0.5%, and the compressive state is stable. The deformation and stress changes of the pipe body, the strain energy and strain energy density of each part, etc. are small, which is directly related to the various physical and mechanical properties of the final product.

[0036] The hydrogenated nitrile HNBR inner rubber has a sealing effect under the action of high-pressure media, and has excellent oil resistance, good fatigue resistance, pulse resistance, high tensile stress and tear resistance, small stress relaxation, good process performance and high physical and mechanical properties. The condensed brominated acenaphthylene (Con-BACN) molecule contains benzene rings and double bonds, which can absorb radiation energy very well and has excellent flame retardant and radiation resistance. The rubber formula of the nuclear power hydraulic oil pipe of the present invention can withstand 10 8 rad nuclear radiation.

[0037] The middle rubber is laid in the two skeleton layers in the hose structure to isolate the adjacent skeleton materials, avoid and buffer the friction under the repeated action of pulse pressure, improve the fatigue of the hose, and thus achieve the purpose of extending the service life. The middle rubber has the characteristics of good adhesion with the skeleton layer material, good fluidity, and good process performance.

[0038] The outer rubber is mainly used to protect the skeleton layer from the influence of the external environment and avoid rapid aging. The outer rubber is mainly made of rubber-plastic alloy, which has the characteristics of wear resistance, aging resistance (ozone, hot air), good adhesion and good flexibility.

[0039] Specifically, the rubber compound (i.e., inner rubber, middle rubber, outer rubber) of the nuclear power hydraulic oil pipe of the present invention is prepared as follows:

[0040] By weight, the inner glue formula includes:

[0041]

[0042] By weight, the medium glue formula includes:

[0043] By weight, the outer glue formula includes:

[0044]

[0045]

[0046] like Figure 2 As shown, the present invention provides a method for preparing a nuclear power hydraulic oil pipe, which specifically includes the following steps:

[0047] Step 1, rubber compound preparation: according to the rubber compound formula, mixing, heat refining and vulcanization are carried out to obtain the rubber compound;

[0048] Step 1.1, the raw rubber is thinly passed on an open mixing mill with a roller distance of 0.5 to 0.8 mm for 3 to 4 minutes;

[0049] Step 1.2, loosen the roller distance by 2-3mm, add small materials in order, and when all the small materials are eaten up, add the reinforcing agent and softener in batches, add the compounding agent and the vulcanization system, and when all are eaten up, adjust the roller distance to 0.5-0.8mm, and pass it through 3 times;

[0050] Step 1.3, adjust the roller distance to 2-3 mm, make 5 triangle packages and 3 rolls, cool the sheet down, and obtain the test sheet;

[0051] Step 1.4: The test piece is vulcanized on a flat vulcanizer at 151°C for 60 min to obtain a rubber compound.

[0052] Step 2, hose forming: squeeze out the rubber material, weave the steel wire skeleton layer, use the soft core method to wrap the nylon water cloth for vulcanization, and obtain the nuclear power hydraulic oil hose;

[0053] The inner rubber is pressed out on the soft core, the outer layer of the inner rubber is woven, two steel wire skeleton layers are woven, the middle rubber is laid between the two skeleton layers, and the outer rubber is coated on the outside of the skeleton layer to obtain a hose; the hose is wrapped with nylon water cloth to tighten the hose, vulcanize it, untie the water cloth, remove the core, and inspect it to obtain a nuclear power hydraulic oil hose.

[0054] When inspecting nuclear power hydraulic oil pipes, ultrasonic flaw detectors are used to detect pipe connectors to eliminate potential quality risks; X-ray machines are used to perform simulated radiation resistance tests on finished products.

[0055] The performance of a finished nuclear power hydraulic oil pipe prepared by the present invention was tested, and the results were as follows:

[0056] Deformation test under pressure: The length change of the hose under the maximum working pressure is -4% to +2%;

[0057] Antistatic test: ≤25*108 / d ohm;

[0058] Low temperature bending performance: no cracking in the test under -40℃ condition;

[0059] Pulse resistance performance: 133%*WP, greater than or equal to 500,000 times;

[0060] Flame retardant test (when required): flaming combustion and flameless combustion time ≤ 30s;

[0061] Sealing performance: No leakage after three tests under working pressure;

[0062] Minimum bursting pressure test: greater than or equal to 4 times the working pressure;

[0063] Wear resistance: mass loss ≤ 0.5g;

[0064] Radiation resistance: 105Gy.

[0065] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A nuclear power hydraulic oil pipe, characterized in that: include: Skeleton layer and rubber. The rubber includes inner rubber, middle rubber and outer rubber. The middle rubber is laid between the two skeleton layers, the inner rubber is laid inside the skeleton layer, and the outer rubber is laid outside the skeleton layer. The steel wires of each skeleton layer are arranged at different angles. The steel wire angle of the first skeleton layer is 54.2°, and the steel wire angle of the second skeleton layer is 55.6°.

2. A nuclear power hydraulic oil pipe according to claim 1, characterized in that: The rubber compound formula comprises hydrogenated butyronitrile and condensed brominated acenaphthylene.

3. A nuclear power hydraulic oil pipe according to claim 2, characterized in that: The inner glue, by weight, comprises:

4. A nuclear power hydraulic oil pipe according to claim 2, characterized in that: The middle glue, by weight, comprises:

5. A nuclear power hydraulic oil pipe according to claim 2, characterized in that: The outer glue, by weight, comprises:

6. A method for preparing a nuclear power hydraulic oil pipe, characterized in that: The method comprises: Step 1, rubber compound preparation: according to the rubber compound formula, mixing, heat refining and vulcanization are carried out to obtain the rubber compound; Step 2, hose forming: squeeze out the rubber material, weave the steel wire skeleton layer, use the soft core method to wrap the nylon water cloth for vulcanization, and obtain the nuclear power hydraulic oil hose.

7. The method for preparing a nuclear power hydraulic oil pipe according to claim 6, characterized in that: The step 1 is specifically as follows: Step 1.1, thinly pass the raw rubber on an open mixing mill; Step 1.2, loosen the roller distance, add small materials in order, and when all the small materials are eaten up, add the reinforcing agent and softener in batches, add the compounding agent and the vulcanization system, and when all are eaten up, adjust the roller distance and pass the thin pass; Step 1.3, adjust the roller distance, make 5 triangle packages and 3 rolls, cool the sheets down, and obtain the test sheets; Step 1.4: vulcanize the test piece on a flat vulcanizer to obtain a rubber compound.

8. The method for preparing a nuclear power hydraulic oil pipe according to claim 7, characterized in that: In the step 1.1, the thin-pass roller spacing is 0.5-0.8 mm, and the time is 3-4 min; in the step 1.2, the roller spacing is relaxed to 2-3 mm, the thin-pass roller spacing is 0.5-0.8 mm, and the thin-pass is performed 3 times; in the step 1.3, the roller spacing is adjusted to 2-3 mm; in the step 1.4, the vulcanization conditions are 151° C.×60 min.

9. The method for preparing a nuclear power hydraulic oil pipe according to claim 6, characterized in that: The step 2 specifically comprises: pressing inner rubber out of the soft core, weaving the outer layer of the inner rubber, weaving two layers of steel wire skeleton layers, laying the middle rubber between the two skeleton layers, and coating the outer rubber on the outside of the skeleton layer to obtain a hose; wrapping the hose with nylon water cloth to tighten the hose, vulcanize it, untie the water cloth, remove the core, inspect it, and obtain a nuclear power hydraulic oil hose.

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