Motor friction plate for large-torque tower crane motor and preparation method of motor friction plate

Abstract

The invention discloses a motor friction plate for a large-torque tower crane motor and a preparation method of the motor friction plate. The friction material is prepared from, by weight, 5%-10% of boron-cashew nut shell oil modified phenolic resin, 4%-8% of polyvinyl alcohol modified phenolic resin, 3%-8% of nitrile rubber powder, 15%-25% of composite fibers, 3%-8% of carbon fibers, 2%-5% of aramid fibers, 5%-10% of bauxite, 0.5%-3% of fluid silicon powder, 3%-7% of friction powder, 2%-8% of crystalline flake graphite, 3%-7% of artificial graphite, 1%-3% of molybdenum disulfide, 12%-20% of precipitated barium sulfate and 3%-8% of calcium hydroxide. 5-10% of diatomite, 5-10% of zinc oxide, and 0.5-3% of a silane coupling agent. The large-torque tower crane motor friction plate is stable in friction performance, low in abrasion and high in cost performance.

Description

Technical Field

[0001] The invention relates to a motor friction plate for a high-torque tower crane motor and a preparation method thereof. Background Art

[0002] The high-torque tower crane motor is a tower crane equipment with strict requirements, which has the characteristics of high strength, good stability and smooth start-up. This motor is widely used in engineering. With the development of the engineering industry, the high-torque tower crane motor is also facing higher requirements. As the key component of the motor, the mechanical properties and friction properties of the motor friction plate directly affect the working performance and safety of the motor. The main requirements for the material of the motor friction plate are: large and stable friction coefficient, the dynamic friction coefficient should be as close as possible to the static friction coefficient; high strength, can withstand impact, not easy to break and peel off at high speed; wear resistance, high temperature resistance, corrosion resistance and good thermal conductivity, small thermal deformation; should not stick when standing for a long time. In addition, it is also required to have a long service life and easy processing.

[0003] At present, this type of motor friction plate is mainly imported, which is not only expensive, but also has large wear and short service life. Therefore, it is urgent to develop a domestically produced high-torque tower crane motor friction plate with stable friction performance, low wear and high cost performance. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a motor friction plate for a high-torque tower crane motor and a preparation method thereof.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a motor friction plate for a large torque tower crane motor, the motor friction plate consists of a steel body and a friction material, wherein the formula of the friction material is as follows by weight percentage: boron-cashew nut shell oil modified phenolic resin (5-10)%, polyvinyl alcohol modified phenolic resin (4-8)%, nitrile rubber powder (3-8)%, composite fiber (15-25)%, carbon fiber (3-8)%, aramid fiber (2-5)%, bauxite (5-10)%, fluid silicon powder (0.5-3)%, friction powder (3-7)%, flake graphite (2-8)%, artificial graphite (3-7)%, molybdenum disulfide (1-3)%, precipitated barium sulfate (12-20)%, calcium hydroxide (3-8)%, diatomaceous earth (5-10)%, zinc oxide (5-10)%, and silane coupling agent (0.5-3)%.

[0006] The present invention also provides a method for preparing a motor friction plate for a high-torque tower crane motor, comprising the following steps:

[0007] Step 1: Prepare pre-pressed material:

[0008] Put the raw materials into the plowshare mixer according to the proportion and mix them evenly. The mixing time is 10-15min and the stirring speed is 800-1200r / min.

[0009] Step 2: Prepare the semi-finished product of motor friction plate:

[0010] Weigh the pre-pressed material and put it into a hot pressing mold for pressing and molding. Set the temperature to 140-160°C, the pressing pressure to 9-12MPa, and keep the temperature and pressure for 10-15 minutes to obtain a semi-finished motor friction plate.

[0011] Step 3: Place the semi-finished motor friction plate into a curing furnace for curing.

[0012] Compared with the prior art, the present invention has the following positive effects:

[0013] The present invention develops a friction plate for a high-torque tower crane motor with stable friction performance, low wear and high cost performance. The composite fiber used in the friction material formula of the present invention is a composite fiber combined with basalt fiber and polyacrylonitrile fiber, which is used to wrap and wrap the filler tightly together, so as to stabilize the friction coefficient and reduce wear; the friction powder is a mixture of cashew nut shell oil and a small amount of aluminum oxide, magnesium oxide and zirconium oxide, and its main function is to improve the friction performance of the friction plate and reduce noise; the silane coupling agent ND-42 is a surfactant, which has a good reinforcing effect on phenolic resin. ND-42 forms an intermediate bridge with special functions between inorganic materials and organic materials. The present invention firmly combines two materials with very different properties, and enhances the overall strength of the friction plate, so that the motor friction plate slows down the decomposition of the organic binder and the peeling and falling of the filler when working, and plays a role in reducing wear.

[0014] Compared with similar foreign products, its friction coefficient is comparable, and its wear is significantly lower than similar foreign products, about 40% of that. DETAILED DESCRIPTION

[0015] (1) The motor friction plate is composed of a steel body and a friction material, wherein the friction material comprises the following components: boron-cashew nut shell oil modified phenolic resin (5-10)%, polyvinyl alcohol modified phenolic resin (4-8)%, nitrile rubber powder (3-8)%, composite fiber (15-25)%, carbon fiber (3-8)%, aramid fiber (2-5)%, bauxite (5-10)%, fluid silica powder (0.5-3)%, friction powder (3-7)%, flake graphite (2-8)%, artificial graphite (3-7)%, molybdenum disulfide (1-3)%, precipitated barium sulfate (12-20)%, calcium hydroxide (3-8)%, diatomaceous earth (5-10)%, zinc oxide (5-10)%, and silane coupling agent (ND-42) (0.5-3)%.

[0016] (2) Among the raw materials, the particle size of boron-cashew nut shell oil modified phenolic resin, polyvinyl alcohol modified phenolic resin, nitrile rubber powder, friction powder, calcium hydroxide, diatomaceous earth, and zinc oxide is ≤250 mesh; the particle size of bauxite, fluid silica powder, molybdenum disulfide, and precipitated barium sulfate is ≥300 mesh; the particle size of flake graphite and artificial graphite is 80-120 mesh.

[0017] The composite fiber is a composite fiber combining basalt fiber and polyacrylonitrile fiber, with a diameter of 10.2μm and a length of 0.25-0.35mm; the aramid fiber has a diameter of 15μm and a length of 2-4mm; the carbon fiber has a length of 0.3-0.8mm; the friction powder is a mixture of cashew nut shell oil and a small amount of aluminum oxide, magnesium oxide and zirconium oxide, and its main function is to improve the friction performance of the friction plate and reduce noise.

[0018] The silane coupling agent ND-42 is called aniline methyl triethoxy silane, which is a surfactant and has a good reinforcing effect on phenolic resin. ND-42 forms an intermediate bridge with special functions between inorganic materials and organic materials, firmly combining two materials with very different properties, thereby enhancing the overall strength of the friction plate. When the motor friction plate is working, the decomposition of the organic binder and the peeling and falling of the filler are slowed down, which plays a role in reducing wear.

[0019] (3) The production process of motor friction plate is as follows:

[0020] A. Put the raw materials into the plowshare mixer according to the proportion and mix them evenly to obtain pre-pressed materials. The mixing time is 10-15min and the stirring speed is 800-1200r / min;

[0021] B. Weigh a certain amount of pre-pressed material and put it into a hot pressing mold for pressing and molding. Set the temperature to 140-160°C, the pressing pressure to 9-12MPa, and keep the temperature and pressure for 10-15min to obtain a semi-finished motor friction plate;

[0022] C. Put the semi-finished motor friction plate into a curing furnace for curing. The curing procedure is: 120-140°C, keep warm for 2 hours; 150-160°C, keep warm for 3 hours; 170-180°C, keep warm for 5 hours; 180-190°C, keep warm for 4 hours; cool evenly to room temperature to obtain the finished motor friction plate. (4) Specific embodiments

[0024] Example 1:

[0025] The present embodiment provides a domestically produced high-torque tower crane motor friction plate and a preparation method with stable friction performance, low wear and high cost performance. The formula of the motor friction plate is as follows by weight percentage: 6% boron-cashew nut shell oil modified phenolic resin, 4% polyvinyl alcohol modified phenolic resin, 5% nitrile rubber powder, 18% composite fiber, 4% carbon fiber, 3% aramid fiber, 6% bauxite, 1.5% fluid silicon powder, 5% friction powder, 5% flake graphite, 5% artificial graphite, 1% molybdenum disulfide, 20% precipitated barium sulfate, 3% calcium hydroxide, 7% diatomaceous earth, 6% zinc oxide, and 0.5% silane coupling agent (ND-42).

[0026] The preparation process of the above motor friction plate mainly includes the following steps:

[0027] A. Put the raw materials into the plowshare mixer according to the proportion and mix them evenly to obtain the pre-pressed material. The mixing time is 12 minutes and the stirring speed is 900r / min.

[0028] B. Weigh a certain amount of pre-pressed material and put it into a hot pressing mold for pressing and molding. Set the temperature to 145°C and the pressing pressure to 12MPa. Keep the temperature and pressure for 15 minutes to obtain a semi-finished motor friction plate.

[0029] C. Put the semi-finished motor friction plate into a curing furnace for curing. The curing procedure is: 120°C, keep warm for 2 hours; 155°C, keep warm for 3 hours; 170°C, keep warm for 5 hours; 180°C, keep warm for 4 hours; cool evenly to room temperature to obtain the finished motor friction plate.

[0030] Example 2:

[0031] The present embodiment provides a domestically produced high-torque tower crane motor friction plate and a preparation method with stable friction performance, low wear and high cost performance. The formula of the motor friction plate is as follows by weight percentage: 7% boron-cashew nut shell oil modified phenolic resin, 5% polyvinyl alcohol modified phenolic resin, 6% nitrile rubber powder, 16% composite fiber, 5% carbon fiber, 4% aramid fiber, 6% bauxite, 1% fluid silicon powder, 5% friction powder, 3% flake graphite, 4% artificial graphite, 2% molybdenum disulfide, 14% precipitated barium sulfate, 6% calcium hydroxide, 7% diatomaceous earth, 8% zinc oxide, and 1% silane coupling agent (ND-42).

[0032] The preparation process of the above motor friction plate mainly includes the following steps:

[0033] A. Put the raw materials into a plowshare mixer according to the proportion and mix them evenly to obtain pre-pressed materials. The mixing time is 12 minutes and the stirring speed is 1000r / min.

[0034] B. Weigh a certain amount of pre-pressed material and put it into a hot pressing mold for pressing and molding. Set the temperature to 155°C and the pressing pressure to 10MPa. Keep the temperature and pressure for 14 minutes to obtain a semi-finished motor friction plate.

[0035] C. Put the semi-finished motor friction plate into a curing furnace for curing. The curing procedure is: 130°C, keep warm for 2 hours; 160°C, keep warm for 3 hours; 175°C, keep warm for 5 hours; 185°C, keep warm for 4 hours; cool evenly to room temperature to obtain the finished motor friction plate.

[0036] Example 3:

[0037] The present embodiment provides a domestically produced high-torque tower crane motor friction plate and a preparation method with stable friction performance, low wear and high cost performance. The formula of the motor friction plate is as follows by weight percentage: 8% boron-cashew nut shell oil modified phenolic resin, 5% polyvinyl alcohol modified phenolic resin, 5% nitrile rubber powder, 16% composite fiber, 3% carbon fiber, 3% aramid fiber, 7% bauxite, 1% fluid silicon powder, 4% friction powder, 6% flake graphite, 4% artificial graphite, 1% molybdenum disulfide, 18% precipitated barium sulfate, 5% calcium hydroxide, 7% diatomaceous earth, 5% zinc oxide, and 2% silane coupling agent (ND-42).

[0038] The preparation process of the above motor friction plate mainly includes the following steps:

[0039] A. Put the raw materials into the plowshare mixer according to the proportion and mix them evenly to obtain the pre-pressed material. The mixing time is 14 minutes and the stirring speed is 1150r / min.

[0040] B. Weigh a certain amount of pre-pressed material and put it into a hot pressing mold for pressing and molding. Set the temperature to 160°C and the pressing pressure to 9MPa. Keep the temperature and pressure for 12 minutes to obtain a semi-finished motor friction plate.

[0041] C. Put the semi-finished motor friction plate into a curing furnace for curing. The curing procedure is: 140°C, keep warm for 2 hours; 160°C, keep warm for 3 hours; 180°C, keep warm for 5 hours; 190°C, keep warm for 4 hours; cool evenly to room temperature to obtain the finished motor friction plate.

[0042] Example 4:

[0043] The present embodiment provides a domestically produced high-torque tower crane motor friction plate and a preparation method with stable friction performance, low wear and high cost performance. The formula of the motor friction plate is as follows by weight percentage: 9% boron-cashew nut shell oil modified phenolic resin, 6% polyvinyl alcohol modified phenolic resin, 3% nitrile rubber powder, 16% composite fiber, 3% carbon fiber, 3.5% aramid fiber, 5% bauxite, 2% fluid silicon powder, 3% friction powder, 4% flake graphite, 6% artificial graphite, 1.5% molybdenum disulfide, 17% precipitated barium sulfate, 7% calcium hydroxide, 5% diatomaceous earth, 6% zinc oxide, and 3% silane coupling agent (ND-42).

[0044] The preparation process of the above motor friction plate mainly includes the following steps:

[0045] A. Put the raw materials into a plowshare mixer according to the proportion and mix them evenly to obtain pre-pressed materials. The mixing time is 15 minutes and the stirring speed is 1100r / min.

[0046] B. Weigh a certain amount of pre-pressed material and put it into a hot pressing mold for pressing and molding. Set the temperature to 150°C and the pressing pressure to 11MPa. Keep the temperature and pressure for 14 minutes to obtain a semi-finished motor friction plate.

[0047] C. Put the semi-finished motor friction plate into a curing furnace for curing. The curing procedure is: 125°C, keep warm for 2 hours; 155°C, keep warm for 3 hours; 170°C, keep warm for 5 hours; 185°C, keep warm for 4 hours; cool evenly to room temperature to obtain the finished motor friction plate.

[0048] The motor friction plate obtained by the above preparation method was subjected to a friction and wear performance comparison test, and the data obtained are as follows:

[0049] The experimental conditions were converted into equivalent values ​​according to the actual working conditions, and the inertia was configured to be 0.54 kg·m 2 The brake pressures are 0.28Mpa and 0.42Mpa respectively, and the speeds are set to 600r / min, 900r / min, 1800r / min, 2400r / min, and 3600r / min. The test results of the friction and wear performance of the motor friction plate are shown in Table 1 below.

[0050] Table 1 Comparison of friction and wear performance test data of motor friction plate

[0051]

[0052] From the above experimental data, it can be seen that the friction coefficients of the four formulations are comparable to similar foreign products, while the wear is significantly lower than similar foreign products, about 40% of foreign products.

Claims

1. A motor friction plate for a high torque tower crane motor, characterized in that: The motor friction plate is composed of a steel body and a friction material, wherein the formula of the friction material is as follows by weight percentage: boron-cashew nut shell oil modified phenolic resin (5-10)%, polyvinyl alcohol modified phenolic resin (4-8)%, nitrile rubber powder (3-8)%, composite fiber (15-25)%, carbon fiber (3-8)%, aramid fiber (2-5)%, bauxite (5-10)%, fluid silicon powder (0.5-3)%, friction powder (3-7)%, flake graphite (2-8)%, artificial graphite (3-7)%, molybdenum disulfide (1-3)%, precipitated barium sulfate (12-20)%, calcium hydroxide (3-8)%, diatomaceous earth (5-10)%, zinc oxide (5-10)%, and silane coupling agent (0.5-3)%.

2. The motor friction plate for a high-torque tower crane motor according to claim 1, characterized in that: The particle sizes of the boron-cashew nut shell oil modified phenolic resin, polyvinyl alcohol modified phenolic resin, nitrile rubber powder, friction powder, calcium hydroxide, diatomaceous earth and zinc oxide are less than or equal to 250 meshes.

3. The motor friction plate for a high-torque tower crane motor according to claim 1, characterized in that: The particle sizes of the bauxite, fluid silicon powder, molybdenum disulfide and precipitated barium sulfate are ≥300 meshes.

4. The motor friction plate for a high-torque tower crane motor according to claim 1, characterized in that: The particle size of the flake graphite and artificial graphite is 80-120 meshes.

5. The motor friction plate for a high-torque tower crane motor according to claim 1, characterized in that: The composite fiber is a composite fiber formed by combining basalt fiber and polyacrylonitrile fiber, with a diameter of 10.2 μm and a length of 0.25 to 0.35 mm.

6. The motor friction plate for a high torque tower crane motor according to claim 1, characterized in that: The aramid fiber has a diameter of 15 μm and a length of 2 to 4 mm.

7. The motor friction plate for a high-torque tower crane motor according to claim 1, characterized in that: The carbon fiber length is 0.3-0.8 mm.

8. The motor friction plate for a high-torque tower crane motor according to claim 1, characterized in that: The friction powder is a mixture of cashew nut shell oil and a small amount of aluminum oxide, magnesium oxide and zirconium oxide.

9. A method for preparing a motor friction plate for a high-torque tower crane motor according to claim 1, characterized in that: The steps include: Step 1: Prepare pre-pressed material: Put the raw materials into the plowshare mixer according to the proportion and mix them evenly. The mixing time is 10-15min and the stirring speed is 800-1200r / min. Step 2: Prepare the semi-finished product of motor friction plate: Weigh the pre-pressed material and put it into a hot pressing mold for pressing and molding. Set the temperature to 140-160°C, the pressing pressure to 9-12MPa, and keep the temperature and pressure for 10-15 minutes to obtain a semi-finished motor friction plate. Step 3: Place the semi-finished motor friction plate into a curing furnace for curing.

10. The method for preparing a motor friction plate for a high-torque tower crane motor according to claim 9, characterized in that: In step 3, the curing process includes the following steps: Step 1: 120-140℃, keep warm for 2h; Step 2: 150-160℃, keep warm for 3h; Step 3: 170-180℃, keep warm for 5h; Step 4: 180-190℃, keep warm for 4h; Step 5: Cool evenly to room temperature to obtain the finished motor friction plate.

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