Semi-direct-drive variable-frequency permanent magnet all-in-one machine assembled with transition shaft and transition shaft machining method

Abstract

The semi-direct-drive variable-frequency permanent magnet all-in-one machine comprises a speed reducer, the transition shaft, a frequency converter and a permanent magnet motor, one end of the transition shaft is assembled with a transmission shaft of the speed reducer, the other end of the transition shaft is assembled with a rotating shaft of the permanent magnet motor, and the frequency converter is assembled with the permanent magnet motor. The invention further provides a machining method of the transition shaft. The machining method comprises the following steps of material selection, turning, milling, drilling, precise grinding, heat treatment and surface treatment. According to the transition shaft produced through the technology, the connecting structure measure of a semi-direct-drive variable-frequency permanent magnet all-in-one machine shaft is achieved, the rotating speed of a permanent magnet all-in-one machine is changed through a frequency converter, the shaft of a permanent magnet motor does not need to be replaced, the connecting mode of the permanent magnet motor and a speed reducer is effectively achieved, and the universality of the permanent magnet motor and the speed reducer is guaranteed.

Description

Technical Field

[0001] The invention relates to a manufacturing technology of a variable frequency permanent magnet integrated machine for mining, and in particular to a semi-direct drive variable frequency permanent magnet integrated machine equipped with a transition shaft and a transition shaft processing method. Background Art

[0002] At present, most of the coal mining or coal transportation equipment in coal mines are industrial frequency motors or variable frequency motors. Industrial frequency motor: The motor only needs to be connected to the industrial frequency power supply, and the power output end can be directly used by connecting the corresponding transportation unit. The disadvantage is that the starting current of the industrial frequency motor is large when it is powered on, and a large capacity transformer is required to meet this requirement. The equipment load and equipment capacity of the coal mine are extremely high, which greatly increases the cost of use. Variable frequency motor: It does not require a large capacity transformer, but a variable frequency power supply is required. The placement of the variable frequency power supply requires additional caverns. The power transmission distance is long and the harmonic loss is large. The transmission chain of mining equipment is complex, the transmission efficiency is low, and the failure rate is high. The semi-direct drive variable frequency speed regulation integrated machine is an emerging product that integrates the inverter, permanent magnet motor, and reducer. This product is suitable for complex working conditions with small working surface space and high torque and low speed requirements for the output of the prime mover. During use, the semi-direct drive variable frequency permanent magnet integrated machine can basically meet the needs of users in terms of size. However, users have different requirements for the power, torque and speed of the motor, and it is often necessary to adjust the thickness of the permanent magnet motor shaft to adapt to the reducer, which seriously affects the versatility of motor components and reducer components. Summary of the invention

[0003] The purpose of the present invention is to provide a semi-direct drive variable frequency permanent magnet integrated machine equipped with a transition shaft and a transition shaft processing method.

[0004] A semi-direct drive variable frequency permanent magnet integrated machine equipped with a transition shaft, comprising a reducer, a transition shaft, a frequency converter and a permanent magnet motor, one end of the transition shaft is equipped with a transmission shaft of the reducer, and the other end is equipped with a rotating shaft of the permanent magnet motor, and the frequency converter is equipped with the permanent magnet motor;

[0005] The transition shaft includes a shaft body, a flat keyway is provided at one end of the shaft body, a spline groove is provided at the other end, and a stress shear groove is provided in the middle; the flat keyway of the transition shaft is matched with the transmission shaft of the reducer, and the spline groove of the transition shaft is matched with the inner hole of the rotating shaft of the permanent magnet motor.

[0006] A method for processing a transition shaft comprises the following steps:

[0007] Step 1: material selection: high-strength and high-hardness alloy steel 40Cr is used as the material of the shaft body;

[0008] Step 2: Turning: turning the material through a lathe and cutting the shaft body material with a tool;

[0009] Step 3: Milling: Use a CNC milling machine to cut the spline grooves and flat key grooves at both ends of the transition shaft, and then turn the shear groove in the middle of the transition shaft;

[0010] Step 4: drilling, using a drilling machine to process the aperture of the transition shaft;

[0011] Step 5: Precision grinding, using surface grinding, external cylindrical grinding and internal cylindrical grinding;

[0012] Step 6: Heat treatment: After the transition shaft is processed, it is heat treated by tempering;

[0013] Step seven, surface treatment, chrome plating, spraying and nitriding are performed to improve the corrosion resistance and friction characteristics of the transition shaft.

[0014] Preferably, in step three, center holes are drilled on both end faces according to the total length milling, and the two ends are positioned and clamped with the center holes. First, the full-length tool is checked to see that its curvature is not greater than 3, and the left end is rough-turned. The large diameter circular surfaces of the end spline are left with 4mm, the flat end surfaces are left with 2mm, and the edges are blunted by 1.5×45°.

[0015] Preferably, in step three, the chuck clamps one end, the center frame is set up, holes and 2×M12 screw holes are drilled, tapped, chamfered, and grooves are cut; the chuck of the lathe clamps one end with three jaws, and the top is used to lift the other end, and precision lathes are turned to various sizes, flattened end faces, and chamfered.

[0016] Preferably, in step three, after turning of one end is completed, one end is clamped with three jaws, the other end is topped with a center, all dimensions are precision turned, all end faces are flattened, grooves are cut, and chamfers are performed.

[0017] Preferably, in step three, the three-jaw chuck of the lathe clamps one end, the other end is positioned and clamped with the center hole, the dial indicator aligns the reference, and the splines at both ends are milled.

[0018] Preferably, in step 3, both ends of the spline are chamfered, and the spline tooth surface is high-frequency quenched. Hole lines and arc lines are drawn; holes and arcs are milled according to the lines; both ends are positioned and clamped with the center hole, and ground into the outer cylindrical surface of the spline.

[0019] The processing technology of the present invention adopts high-strength and high-hardness alloy steel as the material, and the main materials are 40Cr, 42CrMo, etc. The material selection needs to comprehensively consider the factors such as the motor use environment, load-bearing capacity and processing difficulty. The transition shaft needs to be heat treated after processing to improve its hardness and wear resistance. The heat treatment methods include quenching, tempering and surface carburizing. The present invention adopts tempering to heat the quenched spindle again to a certain temperature, and keep it for a period of time, and then cool it to room temperature. This process can reduce the brittleness of the spindle, and the surface treatment adopts spraying treatment. Through the spraying process, a layer of wear-resistant coating is formed on the surface of the transition shaft to improve its friction characteristics. The present invention adopts a transition shaft produced by the above process to solve the connection structure measures of the semi-direct drive variable frequency permanent magnet integrated machine shaft. The permanent magnet integrated machine changes the speed through the frequency converter, and the shaft of the permanent magnet motor does not need to be replaced, so that the permanent magnet motor can save the mold making and ensure the versatility of the motor. Users have different torque requirements for semi-direct drive variable frequency permanent magnet integrated machines, that is, they need different reducers. Now, by simply replacing the transition shaft between the permanent magnet motor and the reducer, the connection method of the permanent magnet motor shaft and the reducer can be effectively solved. The connection method between the permanent magnet motor and the reducer is effectively solved, ensuring the versatility of the permanent magnet motor and the reducer.

[0020] When the reducer and motor are overloaded, or are stuck by ore during transportation, the continuous force of the motor will cause motor demagnetization or reducer gear loss. After using the transition shaft, the stress shear groove will play a role. In the above situation, the transition shaft will break at the stress shear groove to protect the motor and reducer. The transition shaft can be re-matched later. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a semi-direct drive variable frequency permanent magnet integrated machine equipped with a transition shaft;

[0022] Figure 2 It is a schematic diagram of the transition shaft structure;

[0023] In the figure: reducer 1, transition shaft 2, shaft body 20, flat keyway 21, spline groove 22, shear groove 23, inverter 3, permanent magnet motor 4. DETAILED DESCRIPTION

[0024] In order to make the technical solution of the present invention easier to understand, the technical solution of the present invention is now clearly and completely described in the form of specific embodiments in conjunction with the accompanying drawings.

[0025] Please also see Figure 1 and Figure 2The semi-direct drive variable frequency permanent magnet integrated machine equipped with a transition shaft comprises a reducer 1, a transition shaft 2, a frequency converter 3 and a permanent magnet motor 4. One end of the transition shaft 2 is equipped with the transmission shaft of the reducer 1, and the other end is equipped with the rotating shaft of the permanent magnet motor. The frequency converter 3 is equipped with the permanent magnet motor 4.

[0026] The transition shaft 2 includes a shaft body 20, a flat key groove 21 is formed at one end of the shaft body 20, a spline groove 22 is formed at the other end, and a stress shear groove 23 is formed in the middle; the flat key groove 21 of the transition shaft is matched with the transmission shaft of the reducer 1, and the spline groove 22 of the transition shaft 2 is matched with the inner hole of the rotating shaft of the permanent magnet motor 4.

[0027] The assembly process of the semi-direct-drive variable frequency permanent magnet integrated machine equipped with a transition shaft is as follows: place the reducer 1 flat on the workbench with the mating surface of the reducer 1 and the transition shaft 2 facing upwards; apply acid-free anti-rust oil to the transition shaft 2; insert the mating end of the transition shaft 2 vertically into the reducer 1; use a crane to align the inner hole of the permanent magnet motor 4 shaft with the transition shaft 2, and put down the permanent magnet motor 4; align the mounting hole of the permanent magnet motor 4 with the mounting hole of the reducer 1, and tighten them with fastening bolts.

[0028] A method for processing a transition shaft comprises the following steps:

[0029] Step 1: material selection: high-strength and high-hardness alloy steel 40Cr is used as the material of the shaft body;

[0030] Step 2: Turning: turning the material through a lathe and cutting the shaft body material with a tool;

[0031] Step 3: Milling: Use a CNC milling machine to cut the spline grooves and flat key grooves at both ends of the transition shaft, and then turn the shear groove in the middle of the transition shaft;

[0032] Step 4: drilling, using a drilling machine to process the aperture of the transition shaft;

[0033] Step 5: Precision grinding, using surface grinding, external cylindrical grinding and internal cylindrical grinding;

[0034] Step 6: Heat treatment: After the transition shaft is processed, it is heat treated by tempering;

[0035] Step seven, surface treatment, chrome plating, spraying and nitriding are performed to improve the corrosion resistance and friction characteristics of the transition shaft.

[0036] In step three, center holes are drilled on both end faces according to the total length milling, and the two ends are positioned and clamped with the center holes. First, use a full-length tool to check that the curvature is not greater than 3. Rough turn the left end, leave 4mm for each circular surface of the large diameter of the end spline, leave 2mm for each flat end surface, and blunt each edge by 1.5×45°.

[0037] In step three, the chuck clamps one end, the center frame is set up, holes and 2×M12 screw holes are drilled, tapped, chamfered, and grooves are cut; the lathe chuck has three jaws clamp one end, the center point is used to lift the other end, and all dimensions are precision-turned, all end faces are flattened, and chamfers are cut.

[0038] In step three, after turning one end is completed, use three jaws to clamp one end, use a center to turn the other end, and then precision turn all dimensions, flatten all end faces, cut grooves, and chamfer.

[0039] In step three, the three-jaw chuck of the lathe clamps one end, the other end is positioned and clamped with the center hole, the dial indicator is used to align the reference, and splines are milled at both ends.

[0040] In step 3, the two ends of the spline are chamfered and the spline tooth surface is high-frequency quenched. The hole line and arc line are marked; the holes and arcs are milled according to the lines; the two ends are positioned and clamped with the center hole and ground into the outer cylindrical surface of the spline.

[0041] The processing technology of the present invention adopts high-strength and high-hardness alloy steel as the material, and the main materials are 40Cr, 42CrMo, etc. The material selection needs to comprehensively consider the factors such as the motor use environment, load-bearing capacity and processing difficulty. The transition shaft needs to be heat treated after processing to improve its hardness and wear resistance. The heat treatment methods include quenching, tempering and surface carburizing. The present invention adopts tempering to heat the quenched spindle again to a certain temperature, and keep it for a period of time, and then cool it to room temperature. This process can reduce the brittleness of the spindle, and the surface treatment adopts spraying treatment. Through the spraying process, a layer of wear-resistant coating is formed on the surface of the transition shaft to improve its friction characteristics. The present invention adopts a transition shaft produced by the above process to solve the connection structure measures of the semi-direct drive variable frequency permanent magnet integrated machine shaft. The permanent magnet integrated machine changes the speed through the frequency converter, and the shaft of the permanent magnet motor does not need to be replaced, so that the permanent magnet motor can save the mold making and ensure the versatility of the motor. Users have different torque requirements for semi-direct drive variable frequency permanent magnet integrated machines, that is, they need different reducers. Now, by simply replacing the transition shaft between the permanent magnet motor and the reducer, the connection method of the permanent magnet motor shaft and the reducer can be effectively solved. The connection method between the permanent magnet motor and the reducer is effectively solved, ensuring the versatility of the permanent magnet motor and the reducer.

[0042] When the reducer and motor are overloaded, or are stuck by ore during transportation, the continuous force of the motor will cause motor demagnetization or reducer gear loss. After using the transition shaft, the stress shear groove will play a role. In the above situation, the transition shaft will break at the stress shear groove to protect the motor and reducer. The transition shaft can be re-matched later.

[0043] It should be noted that the embodiments described herein are only partial embodiments of the present invention, rather than all implementations of the present invention, and the embodiments are only exemplary, and their role is only to provide a more intuitive and clear way to understand the content of the present invention, rather than to limit the technical solutions described in the present invention. Without departing from the concept of the present invention, all other implementation methods that can be thought of by ordinary technicians in this field without creative work, and other simple replacements and various changes to the technical solutions of the present invention, all belong to the protection scope of the present invention.

Claims

1. A semi-direct drive variable frequency permanent magnet integrated machine equipped with a transition shaft, characterized in that: The semi-direct drive variable frequency permanent magnet integrated machine equipped with a transition shaft comprises a reducer, a transition shaft, a frequency converter and a permanent magnet motor. One end of the transition shaft is equipped with the transmission shaft of the reducer, and the other end is equipped with the rotating shaft of the permanent magnet motor. The frequency converter is equipped with the permanent magnet motor. The transition shaft includes a shaft body, a flat keyway is provided at one end of the shaft body, a spline groove is provided at the other end, and a stress shear groove is provided in the middle; the flat keyway of the transition shaft is matched with the transmission shaft of the reducer, and the spline groove of the transition shaft is matched with the inner hole of the rotating shaft of the permanent magnet motor.

2. A method for processing a transition shaft according to claim 1, characterized in that: The processing method of the transition shaft includes the following steps: Step 1: material selection: high-strength and high-hardness alloy steel 40Cr is used as the material of the shaft body; Step 2: Turning: turning the material through a lathe and cutting the shaft body material with a tool; Step 3: Milling: Use a CNC milling machine to cut the spline grooves and flat key grooves at both ends of the transition shaft, and then turn the shear groove in the middle of the transition shaft; Step 4: drilling, using a drilling machine to process the aperture of the transition shaft; Step 5: Precision grinding, using surface grinding, external cylindrical grinding and internal cylindrical grinding; Step 6: Heat treatment: After the transition shaft is processed, it is heat treated by tempering; Step seven, surface treatment, chrome plating, spraying and nitriding are performed to improve the corrosion resistance and friction characteristics of the transition shaft.

3. The method for processing a transition shaft according to claim 2, characterized in that: In step three, center holes are drilled on both end faces according to the total length milling, and the two ends are positioned and clamped with the center holes. First, use a full-length tool to check that the curvature is not greater than 3. Rough turn the left end, leave 4mm for each circular surface of the large diameter of the end spline, leave 2mm for each flat end surface, and blunt each edge by 1.5×45°.

4. The method for processing a transition shaft according to claim 2, characterized in that: In step three, the chuck clamps one end, the center frame is set up, holes and 2×M12 screw holes are drilled, tapped, chamfered, and grooves are cut; the lathe chuck has three jaws clamp one end, the center point is used to lift the other end, and all dimensions are precision-turned, all end faces are flattened, and chamfers are cut.

5. The method for processing a transition shaft according to claim 2, characterized in that: In step three, after turning one end is completed, use three jaws to clamp one end, use a center to turn the other end, and then precision turn all dimensions, flatten all end faces, cut grooves, and chamfer.

6. The method for processing a transition shaft according to claim 2, characterized in that: In step three, the three-jaw chuck of the lathe clamps one end, the other end is positioned and clamped with the center hole, the dial indicator is used to align the reference, and splines are milled at both ends.

7. The method for processing a transition shaft according to claim 2, characterized in that: In step 3, the two ends of the spline are chamfered and the spline tooth surface is high-frequency quenched. The hole line and arc line are marked; the holes and arcs are milled according to the lines; the two ends are positioned and clamped with the center hole and ground into the outer cylindrical surface of the spline.

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