A liquid nitrogen rapid cooling rotor platform

Abstract

The application provides a liquid nitrogen rapid cooling rotor platform, which comprises an insulation tank body, an insulation tank cover, an equipment base, a power support, a servo motor, a speed reducer and an electric control cabinet; a liquid nitrogen vaporization pipe and a transmission shaft are arranged in the insulation tank body, the lower end of the transmission shaft extends out of the bottom surface of the insulation tank body, the upper end of the transmission shaft is circumferentially provided with a rotating disc, and a plurality of rotor positioning seats are uniformly distributed on the rotating disc; a low-temperature electromagnetic valve is arranged outside the insulation tank body; a material taking and placing opening, a rotating angle cylinder and a temperature sensor are arranged on the insulation tank cover, and a material taking sealing door is arranged on the rotating angle cylinder; a plurality of tank body struts are arranged on the equipment base and supported on the lower end edge of the insulation tank body; a bearing seat is arranged on the top of the power support, and the lower end of the transmission shaft penetrates through the bearing seat; the servo motor and the speed reducer are fixed in the power support, and a cross slider coupling is connected between the output shaft of the speed reducer and the lower end of the transmission shaft.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle motor rotor assembly, and mainly relates to a liquid nitrogen rapid cooling rotor platform. Background Technology

[0002] With the gradual phasing out of gasoline-powered vehicles, the new energy vehicle market is rapidly expanding, accompanied by a huge issue of capacity expansion. The motor is a crucial component of new energy vehicles, and its assembly is a key link in ensuring mass production. Currently, the main technical challenges are: 1. High production cycle time: The rotor cooling and cold assembly process is equally important. To meet modern assembly cycle times, a 120-second production cycle for the rotor is required, which conventional freezer refrigeration methods cannot achieve for rapid rotor cooling; 2. When using ultra-low temperature cooling, sealing the bottom of the insulation tank is very difficult, easily leading to problems such as leakage at the bottom of the motor; 3. To meet the production cycle time, material feeding and unloading are automated mechanical processes. At ultra-low temperatures, the positioning accuracy of mechanical movements is greatly affected by the ultra-low temperature environment and the operating conditions of the components, making accurate positioning extremely difficult to achieve. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide a liquid nitrogen rapid cooling rotor platform to overcome the above-mentioned problems or at least partially solve or alleviate them.

[0004] This invention proposes a liquid nitrogen rapid cooling rotor platform, comprising:

[0005] The insulated tank has an opening at the top. Inside the insulated tank, there is a liquid nitrogen vaporization pipe and a drive shaft. The lower end of the drive shaft extends out of the bottom surface of the insulated tank. A turntable is circumferentially distributed at the upper end of the drive shaft. Multiple rotor positioning seats are evenly distributed on the turntable. A low-temperature solenoid valve is installed outside the insulated tank and is connected to the liquid nitrogen vaporization pipe.

[0006] The insulated tank lid is located at the upper port of the insulated tank body. The insulated tank lid is provided with a material feeding port, a corner cylinder and a temperature sensor. The corner cylinder is provided with a material feeding sealing door. The detection end of the temperature sensor passes downward through the insulated tank lid.

[0007] The equipment base is provided with multiple tank supports, which support the lower edge of the insulated tank.

[0008] A power support is provided, which is located directly below the heat preservation tank. A bearing seat is provided on the top of the power support, and the lower end of the drive shaft passes through the bearing seat.

[0009] A servo motor and a reducer are fixed in the power bracket, and a cross-slider coupling is connected between the output shaft of the reducer and the lower end of the transmission shaft.

[0010] An electrical control cabinet is provided, with an operation panel on it. The signal input terminal of the electrical control cabinet receives the detection signal from the temperature sensor, and the multiple signal output terminals of the electrical control cabinet control the low-temperature solenoid valve, the servo motor, and the rotary cylinder, respectively.

[0011] The present invention also has the following optional features.

[0012] Optionally, a water receiving tray is provided on the drive shaft between the bearing housing and the insulated tank.

[0013] Optionally, a turntable support is provided at the lower part of the turntable, and the turntable support is made of ultra-low temperature quartz material.

[0014] Optionally, a heating belt is also provided on the upper part of the insulated container lid.

[0015] Optionally, the power support includes:

[0016] A load-bearing plate is provided, and multiple adjustable pads are provided between the load-bearing plate and the equipment base. Multiple columns are provided on the load-bearing plate, and annular fixing plates are provided at the upper ends of the multiple columns. The upper end of the reducer is connected to the annular fixing plates.

[0017] An annular top plate, with multiple short columns provided between the annular top plate and the annular fixed plate, and the annular top plate is fixedly connected to the bearing seat.

[0018] Optionally, a pressure relief valve is also provided on the side wall of the insulated tank.

[0019] Optionally, the liquid nitrogen vaporization tubes are arranged horizontally in an arc shape above each rotor positioning seat.

[0020] Optionally, a protective cover is provided in the middle of the turntable, and the detection end of the temperature sensor extends into the protective cover.

[0021] The liquid nitrogen rapid cooling rotor platform of this invention is equipped with an insulated tank. Liquid nitrogen is introduced into the insulated tank to rapidly cool the rotor workpiece to meet the pace of modern assembly. A drive shaft turntable is vertically arranged inside the insulated tank, and a servo motor and reducer are vertically arranged below the insulated tank to directly drive the drive shaft and turntable to rotate, so as to ensure the positioning accuracy of mechanical movements at ultra-low temperatures. This ensures that the rotor station is directly opposite the material storage sealing door, which facilitates the external robot arm to accurately store or retrieve the rotor workpiece placed on the rotor station. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external structure of the liquid nitrogen rapid cooling rotor platform of the present invention;

[0023] Figure 2 This is a top view of the liquid nitrogen rapid cooling rotor platform of the present invention.

[0024] Figure 3 This is a schematic diagram of the internal structure of the liquid nitrogen rapid cooling rotor platform of the present invention;

[0025] Figure 4 This is a schematic diagram of the right cross-sectional structure of the liquid nitrogen rapid cooling rotor platform of the present invention;

[0026] Figure 5 This is a cross-sectional view of the power support structure of the liquid nitrogen rapid cooling rotor platform of the present invention.

[0027] In the above diagram: 1. Electrical control cabinet; 2. Control panel; 3. Insulated tank lid; 4. Inspection port; 5. Corner cylinder; 6. Material handling sealing door; 7. Heating belt; 8. Lifting ring; 9. Top cover buckle; 10. Low temperature solenoid valve; 11. Pressure reducing valve; 12. Drain valve; 13. Equipment base; 14. Load-bearing plate; 15. Column; 16. Reducer; 17. Servo motor; 18. Two-position five-way solenoid valve for opening and closing the door; 19. Gas source pressure regulating valve; 20. Pressure relief valve; 21. Insulated tank body; 22. Liquid nitrogen vaporization pipe; 23. Rotor workpiece; 24. Rotor positioning seat. ; 25 Turntable; 26 Water receiving tray; 27 Cross-slider coupling; 28 Annular fixing plate; 29 Bearing seat; 30 Drive shaft; 31 Thrust ball bearing; 32 Inner fixing sleeve; 33 Outer fixing sleeve; 34 Outer load-bearing fixing plate; 35 Locking nut; 36 Hall sensor; 37 Short column; 38 Adjustable shim; 39 Annular top plate; 40 Liquid nitrogen inlet; 41 Liquid nitrogen pressure reducing valve bracket; 42 Temperature sensor; 43 Material loading / unloading port; 44 Tank support column; 45 Protective cover; 46 Turntable support component.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0029] Example 1

[0030] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4An embodiment of the present invention provides a liquid nitrogen rapid cooling rotor platform, comprising: an insulated tank 21, an insulated tank cover 3, an equipment base 13, a power support, a servo motor 17, a reducer 16, and an electrical control cabinet 1; the insulated tank 21 has an opening at the top, and a liquid nitrogen vaporization pipe 22 and a drive shaft 30 are arranged inside the insulated tank 21. The lower end of the drive shaft 30 extends out of the bottom surface of the insulated tank 21, and a turntable 25 is circumferentially distributed at the upper end of the drive shaft 30. Multiple rotor positioning seats 24 are evenly distributed on the turntable 25, and each rotor positioning seat 24 can hold a rotor workpiece 23; a low-temperature solenoid valve 10 is arranged outside the insulated tank 21, and the low-temperature solenoid valve 10 is connected to the liquid nitrogen vaporization pipe 22; the insulated tank cover 3 is located at the upper port of the insulated tank 21, and the insulated tank cover 3 is provided with a material loading / unloading port 43, a corner cylinder 5, and a temperature control unit. A temperature sensor 42 is installed on the angle cylinder 5, and a material-receiving sealing door 6 is provided on the angle cylinder 5. The detection end of the temperature sensor 42 passes downward through the heat preservation tank cover 3. Multiple tank support columns 44 are provided on the equipment base 13, and the multiple tank support columns 44 support the lower edge of the heat preservation tank 21. The power support is located directly below the heat preservation tank 21, and a bearing seat 29 is provided on the top of the power support. The lower end of the transmission shaft 30 passes through the bearing seat 29. The servo motor 17 and the reducer 16 are fixed in the power support. A cross slider coupling 27 is connected between the output shaft of the reducer 16 and the lower end of the transmission shaft 30. An operation panel 2 is provided on the electrical control cabinet 1. The signal input terminal of the electrical control cabinet 1 receives the detection signal of the temperature sensor 3. The multiple signal output terminals of the electrical control cabinet 1 control the low temperature solenoid valve 10, the servo motor 17 and the angle cylinder 5 respectively.

[0031] The insulated tank lid 3 is fixed to the port of the insulated tank body 21 by the top cover buckle 9. The edge of the insulated tank lid 3 is provided with multiple lifting rings 8, which can be lifted when the lid is opened. The insulated tank lid 3 is also provided with an inspection port 4 for temporary maintenance. The cryogenic solenoid valve 10 is connected to the pressure reducing valve 11 and the liquid nitrogen inlet 40 through a pipeline. The liquid nitrogen pressure reducing valve bracket 41 is connected below the pipeline to support the weight of the pressure reducing valve 11. The liquid nitrogen inlet 40 is used to flush in liquid nitrogen. The pressure reducing valve 11 can reduce the pressure of the liquid nitrogen inlet 40. The insulated tank body 21 is also provided with a drain valve 12 to drain the accumulated liquid inside the insulated tank body 21. An annular boss is provided on the bottom inner side of the insulation tank 21 around the drive shaft 30 to prevent liquid accumulation at the bottom of the insulation tank 21 from flowing to the opening where the drive shaft 30 is located. A cross-slider coupling 27 is used to isolate the reducer 16 from the drive shaft 30 to prevent the low temperature inside the insulation tank 21 from being transmitted to the servo motor 17 through the drive shaft 30 and affecting its use. An ultra-low temperature mechanical seal is used to seal the insulation tank 21 and the drive shaft 30 to further prevent leakage. The corner cylinder 5 is connected to a high-pressure air source through a pressure air pipeline to provide power to the corner cylinder 5. A two-position five-way solenoid valve 18 and an air source pressure regulating valve 19 are connected to the pressure air pipeline to control the movement of the corner cylinder 5.

[0032] During use, the cryogenic solenoid valve 10 is opened, and liquid nitrogen is injected into the insulation tank 21 through the liquid nitrogen inlet 40 and the pressure reducing valve 11. After entering the liquid nitrogen vaporization pipe 22, the liquid nitrogen is sprayed onto the rotor workpieces 23 on each rotor positioning seat 24 inside the insulation tank 21 to quickly cool down the rotor workpieces 23. The temperature sensor 42 detects the temperature inside the insulation tank 21 and feeds the detection result back to the electrical control cabinet 1, so that the cryogenic solenoid valve 10 can adjust the liquid nitrogen inlet in real time to regulate the temperature.

[0033] When storing rotor workpiece 23, the corner cylinder 5 is controlled by the two-position five-way solenoid valve 18 to open the material-retrieving sealing door 6. At this time, the external robot arm puts the rotor workpiece 23 into the rotor positioning seat 24 or takes it out from the rotor positioning seat 24. Then the corner cylinder 5 closes the material-retrieving sealing door 6. Each time the rotor workpiece 23 is stored, the servo motor 17 drives the transmission shaft 30 and the turntable 25 to rotate by an angle through the reducer 16, so that the next rotor positioning seat 24 is facing the material-retrieving sealing door 6, which makes it convenient for the external robot arm to accurately store or grab the rotor workpiece 25.

[0034] Example 2

[0035] refer to Figure 4 and Figure 5 Based on Example 1, a water receiving tray 26 is provided on the drive shaft 30 between the bearing seat 29 and the heat preservation tank 21.

[0036] The low temperature in the heat preservation tank 21 can be transferred to the outside through the drive shaft 30, which can cause condensation on the drive shaft 30 outside the heat preservation tank 21. In order to prevent the condensation from flowing into the bearing seat 29 along the drive shaft, a water receiving tray 26 is set on the drive shaft 30 to block the condensation.

[0037] Example 3

[0038] refer to Figure 4 Based on Example 1, a turntable support 46 is provided at the lower part of the turntable 25. The turntable support 46 is made of ultra-low temperature quartz material.

[0039] Because the turntable 25 needs to work with the robotic arm to pick up and put down materials, the moving parts need to meet high precision requirements. However, the moving parts are located in an ultra-low temperature environment, which has a huge amount of deformation and common materials cannot work in an ultra-low temperature environment. Therefore, it is necessary to focus on solving the rotor positioning problem in an ultra-low temperature environment. The turntable support 46 is made of ultra-low temperature quartz material, which can reduce the precision error caused by ultra-low temperature metal deformation.

[0040] Example 4

[0041] refer to Figure 1 Based on Example 1, a heating band 7 is also provided on the upper part of the insulated tank lid 3.

[0042] The heating belt 7 is set on the top of the insulated tank lid 3 and close to the material inlet 43. The heating belt 7 is heated by electricity, which can prevent condensation from forming on the outer surface of the insulated tank lid 3.

[0043] Example 5

[0044] refer to Figure 5 Based on Embodiment 1, the power support includes: a load-bearing plate 14 and an annular top plate 39; multiple adjustable pads 38 are provided between the load-bearing plate 14 and the equipment base 13, multiple columns 15 are provided on the load-bearing plate 14, and an annular fixing plate 28 is provided at the upper end of the multiple columns 15; the upper end of the reducer 16 is connected to the annular fixing plate 28; multiple short columns 37 are provided between the annular top plate 39 and the annular fixing plate 28, and the annular top plate 39 is fixedly connected to the bearing seat 29.

[0045] Both the annular top plate 39 and the annular fixed plate 28 have an inner circle and an outer square structure. Four short columns 37 are located at the four corners of the annular top plate 39 and the annular fixed plate 28. Four adjustable shims 38 are located between the equipment base 13 and the load-bearing plate 14 to adjust the verticality of the entire power support to the horizontal plane. The bearing seat 29 has a cylindrical structure, and an annular disk is provided on the outer side of the lower end of the bearing seat 29. The annular disk rests on the annular top plate 39, and the annular top plate 39 bears the weight of the entire bearing seat 29 and the transmission shaft 30 through the annular disk. Two thrust ball bearings 31 are installed inside the bearing seat 29. An inner fixing sleeve 32 is provided between the inner rings of the two thrust ball bearings 31. The inner rings and inner fixing sleeves 32 of the two thrust ball bearings 31 are both fitted onto the drive shaft 30. An outer fixing sleeve 33 is provided between the outer rings of the two thrust ball bearings 31 and is fitted onto the inner side of the bearing housing 29. An annular outer load-bearing fixing plate 34 is connected to the lower end of the bearing housing 29. The outer load-bearing fixing plate 34 contacts the outer ring of the thrust ball bearing 31. The thrust ball bearing 31 bears the weight of the entire drive shaft 30. The concentricity of the turntable 25 is achieved by the two sets of thrust ball bearings 31, ensuring that the rotor workpiece 23 can stop at the designated position every time under ultra-low temperature. A locking nut 35 is also connected to the lower end of the drive shaft 30. The locking nut 35 presses against the lower end of the inner ring of the thrust ball bearing 31. A Hall sensor 36 is also provided on the annular top plate 39. The end of the Hall sensor 36 faces the bottom of the insulation tank 21 and can detect the distance between the annular top plate 39 and the insulation tank 21.

[0046] Example 6

[0047] refer to Figure 1 and Figure 2 Based on Example 1, a pressure relief valve 20 is also provided on the side wall of the heat preservation tank 21.

[0048] After liquid nitrogen evaporates, the internal pressure of the insulation tank 21 will increase. When the pressure increases to the preset value, the pressure relief valve 20 will release the pressure of the insulation tank 21.

[0049] Example 7

[0050] refer to Figure 3 and Figure 4 Based on Example 1, the liquid nitrogen vaporization tube 22 is horizontally distributed in an arc shape above each rotor positioning seat 24.

[0051] Since the ten rotor positioning seats 24 are symmetrically distributed on the turntable 25, the liquid nitrogen vaporization pipe 22 is also horizontally distributed in an arc shape above each rotor positioning seat 24, so that the liquid nitrogen nozzle on the liquid nitrogen vaporization pipe 22 can directly spray liquid nitrogen to cool the rotor workpiece 23 placed on the rotor positioning seat 24.

[0052] Example 8

[0053] refer to Figure 3 and Figure 4 Based on embodiment 7, a protective cover 45 is provided in the middle of the turntable 25, and the detection end of the temperature sensor 42 extends into the protective cover 45.

[0054] Small holes are evenly distributed on the side wall of the protective cover 45, which will not hinder air circulation, and at the same time can prevent liquid nitrogen from being sprayed directly onto the temperature sensor 42 and affecting the accuracy of the temperature sensor 42.

[0055] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. Components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and will not be described in detail here.

Claims

1. A liquid nitrogen rapid cooling rotor platform, characterized in that, include: The insulated tank (21) has an opening at the top. The insulated tank (21) is equipped with a liquid nitrogen vaporization pipe (22) and a drive shaft (30). The lower end of the drive shaft (30) extends out of the bottom surface of the insulated tank (21). A turntable (25) is circumferentially distributed at the upper end of the drive shaft (30). Multiple rotor positioning seats (24) are evenly distributed on the turntable (25). A low-temperature solenoid valve (10) is provided outside the insulated tank (21). The low-temperature solenoid valve (10) is connected to the liquid nitrogen vaporization pipe (22). The insulated tank lid (3) is located at the upper port of the insulated tank body (21). The insulated tank lid (3) is provided with a material feeding port (43), a corner cylinder (5) and a temperature sensor (42). The corner cylinder (5) is provided with a material feeding sealing door (6). The detection end of the temperature sensor (42) passes downward through the insulated tank lid (3). Equipment base (13), on which multiple tank supports (44) are provided, the multiple tank supports (44) supporting the lower edge of the insulated tank (21); A power support is provided, which is located directly below the heat preservation tank (21). A bearing seat (29) is provided on the top of the power support, and the lower end of the drive shaft (30) passes through the bearing seat (29). A servo motor (17) and a reducer (16) are fixed in the power bracket. A cross-slider coupling (27) is connected between the output shaft of the reducer (16) and the lower end of the transmission shaft (30). An electrical control cabinet (1) is provided with an operation panel (2). The signal input terminal of the electrical control cabinet (1) receives the detection signal from the temperature sensor (42). The multiple signal output terminals of the electrical control cabinet (1) control the low-temperature solenoid valve (10), the servo motor (17), and the rotary cylinder (5), respectively.

2. The liquid nitrogen rapid cooling rotor platform according to claim 1, characterized in that, A water receiving tray (26) is provided on the drive shaft (30) between the bearing seat (29) and the heat preservation tank (21).

3. The liquid nitrogen rapid cooling rotor platform according to claim 1, characterized in that, The turntable (25) is provided with a turntable support (46) at its lower part, and the turntable support (46) is made of ultra-low temperature quartz material.

4. The liquid nitrogen rapid cooling rotor platform according to claim 1, characterized in that, A heating band (7) is also provided on the upper part of the insulated tank lid (3).

5. The liquid nitrogen rapid cooling rotor platform according to claim 1, characterized in that, The power support includes: A load-bearing plate (14) is provided with multiple adjustable pads (38) between the load-bearing plate (14) and the equipment base (13). Multiple columns (15) are provided on the load-bearing plate (14). An annular fixing plate (28) is provided at the upper end of the multiple columns (15). The upper end of the reducer (16) is connected to the annular fixing plate (28). An annular top plate (39) is provided with a plurality of short columns (37) between the annular top plate (39) and the annular fixing plate (28), and the annular top plate (39) is fixedly connected to the bearing seat (29).

6. The liquid nitrogen rapid cooling rotor platform according to claim 1, characterized in that, The heat preservation tank (21) is also equipped with a pressure relief valve (20) on its side wall.

7. The liquid nitrogen rapid cooling rotor platform according to claim 1, characterized in that, The liquid nitrogen vaporization pipe (22) is horizontally distributed in an arc shape above each rotor positioning seat (24).

8. The liquid nitrogen rapid cooling rotor platform according to claim 7, characterized in that, A protective cover (45) is provided in the middle of the turntable (25), and the detection end of the temperature sensor (42) extends into the protective cover (45).

Images