Motor shrinkage fit equipment and process thereof

Abstract

The invention discloses a motor hot jacket device and a process thereof, the motor hot jacket device comprises a rack, the rack is provided with a stator carrying table, a casing carrying table and a heater used for heating a casing, and the rack is provided with a positioning mechanism used for correcting micro displacement caused by expansion after the casing is heated. A rotatable turntable is arranged on the bottom plate; the stator carrying table and the casing carrying table are arranged on the turntable; each adjacent stator carrying platform and casing carrying platform are combined to form a station, and four stations are uniformly distributed on the turntable. The heating machine and the positioning mechanism are arranged corresponding to the same station, the stator placing mechanism is arranged corresponding to the second station, the cooling mechanism is arranged corresponding to the third station, and the fourth station is a taking and placing station. Micro displacement caused by expansion after the casing is heated is corrected, so that the scratch risk of the stator placed in the casing is effectively reduced, and the assembly effect is improved; and the four-station arrangement is adopted, so that the production efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor shrink fitting, and in particular to a motor shrink fitting device and its process. Background Art

[0002] With the rapid development of new energy vehicles, the production demand for new energy vehicles has also increased accordingly. The main internal structure of current new energy motors is a housing assembly, a resolver assembly, an end cover, and a rotor. Among them, the stator in the housing assembly is combined with the outer housing assembly through shrink fitting. Existing shrink fitting devices basically heat the housing through a high-frequency heating machine to make it expand, then place the stator into the housing, and after the housing cools and shrinks, the stator is fixed inside the housing.

[0003] However, existing shrink fitting devices basically do not align the concentricity of the heated housing, so that during the sleeving process, the outer wall of the stator rubs against the inner wall of the housing, affecting the position of the stator inside the housing after cooling, and ultimately resulting in unqualified motor performance. Moreover, the waiting time during the shrink fitting process of existing devices is relatively long. During the shrink fitting process of the housing assembly, it is necessary to completely heat and sleeve the housing before performing the shrink fitting operation on the next housing, which affects production efficiency. For example, a motor housing heating and shrink fitting device for new energy vehicles disclosed in Patent CN208691113U includes a frame, a stator winding assembly mechanism, a stator winding tray, a first manipulator, a motor housing tray, a second manipulator, an induction heating mechanism, and a PLC control system. The PLC control system is respectively in communication connection with the stator winding assembly mechanism, the first manipulator, the second manipulator, and the induction heating mechanism. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a motor shrink fitting device and its process, which can effectively reduce the risk of rubbing when the stator is placed into the housing.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A motor shrink fitting device includes a frame. A stator carrier and a housing carrier are provided on the frame, and a heating machine for heating the housing is provided on the frame. A positioning mechanism for correcting the minute displacement caused by the expansion of the heated housing is provided on the frame.

[0007] A bottom plate is provided on the frame, and a rotatable turntable is provided on the bottom plate. The stator carrier and the housing carrier are both provided on the turntable.

[0008] Each adjacent combination of the stator carrier and the housing carrier forms a working station, and four working stations are evenly distributed on the turntable.

[0009] The heating machine and the positioning mechanism are arranged corresponding to the same station, the stator placement mechanism is arranged corresponding to the second station, the cooling mechanism is arranged corresponding to the third station, and the fourth station is a pick-and-place station.

[0010] The heating machine is a high-frequency heating machine, and the positioning mechanism includes a first electric cylinder and a casing chuck arranged at the lower end of the first electric cylinder. The first electric cylinder is located directly above the induction heating coil of the high-frequency heating machine.

[0011] The cooling mechanism includes a connected air duct assembly and a fan, and the lower end of the air duct assembly is arranged corresponding to the third workstation.

[0012] The stator insertion mechanism comprises a second electric cylinder and a stator chuck arranged at the lower end of the second electric cylinder.

[0013] A top plate is provided on the top of the frame, and the first electric cylinder and the second electric cylinder are both movably arranged on the top plate.

[0014] The housing chuck and the stator chuck are both internal expansion type three-jaw chucks.

[0015] A process for heat-shrink ...fitting of a stator and a housing using the motor heat-shrink-shrink-shrink-fitting device comprises the following steps:

[0016] Step 1: Place the first set of housing and stator on the stator carrier and housing carrier on the turntable respectively. The turntable rotates 90°, and the high-frequency heating machine and the induction heating coil descend together. At this time, the induction heating coil is wrapped around the housing to be heated, and the high-frequency heating machine heats the housing to the specified temperature.

[0017] Step 2: The first electric cylinder of the positioning mechanism begins to move horizontally to the final position. At this time, the cylinder body in the first electric cylinder extends out, and the three-jaw chuck in the casing is placed on the heated inner wall of the casing. At this time, the cylinder connected to the three-jaw chuck in the casing extends out, and the three claws of the three-jaw chuck in the casing are pushed outward, so that the three claws contact the inner wall of the casing. After the position of the heated casing is corrected, the three claws shrink inward, and then the cylinder body of the first electric cylinder retracts, and the three-jaw chuck in the casing is taken out of the casing, and the first electric cylinder begins to move horizontally to the initial position;

[0018] Step 3: The turntable rotates 90°, and the stator insertion mechanism works to place the stator core internal expansion type three-jaw chuck on the inner wall of the stator core, so that the three claws contact the inner wall of the stator core, and then take the stator out of the stator positioning seat, and put the clamped stator into the heated casing, and then retract the three claws of the stator core internal expansion type three-jaw chuck inwards to separate the three claws from the inner wall of the stator core, and then take the stator core internal expansion type three-jaw chuck out of the stator, and then the stator sleeve process is completed;

[0019] Step 4: The turntable rotates 90°. The stator assembly completed with hot sleeving rotates to the cooling station. Lower the axial flow fan and the air duct assembly together so that the air duct assembly is sleeved on the stator assembly. The axial flow fan operates to form an air flow that sucks air outwards in the air duct assembly, thereby cooling the stator assembly and accelerating the cooling of the machine housing. After the heating and sleeving processes of the previous process are completed, raise the axial flow fan and the air duct assembly together;

[0020] Step 5: The turntable rotates 90°. Remove the cooled stator assembly, and place the stator and the machine housing on the empty carrier table, and work in sequence and cycle.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The hot sleeving equipment and its process of this motor are reasonably designed. By setting a positioning mechanism, the micro displacement caused by the expansion of the machine housing after heating is corrected, the concentricity during the stator sleeving process is improved, the risk of rubbing when the stator is placed in the machine housing is effectively reduced, and the assembly effect is improved; and the equipment adopts a four-station layout, which greatly improves the production efficiency. Description of the Drawings

[0023] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0024] Figure 1 It is an axonometric schematic diagram of the hot sleeving equipment of the present invention.

[0025] Figure 2 It is a front view schematic diagram of the hot sleeving equipment of the present invention.

[0026] Figure 3 It is a side view schematic diagram of the hot sleeving equipment of the present invention.

[0027] Figure 4 It is a schematic diagram after the stator and the machine housing are hot sleeved in the present invention.

[0028] In the figure:

[0029] 1. Bottom plate; 2. Turntable; 3. Top plate; 4. High-frequency heating machine; 5. First electric cylinder; 6. Second electric cylinder; 7. Stator carrier table; 8. Machine housing carrier table; 9. Induction heating coil; 10. Axial flow fan; 11. Air duct assembly; 12. Machine housing internal expansion three-jaw chuck; 13. Stator core internal expansion three-jaw chuck. Detailed Embodiments

[0030] The following further describes in detail the specific embodiments of the present invention by describing the embodiments with reference to the drawings.

[0031] The motor hot - sleeving device includes a frame; the frame is of a framework structure, on which a stator carrier and a housing carrier are provided, as well as a heating machine for heating the housing. A positioning mechanism is provided on the frame for correcting the minute displacement caused by the expansion of the housing after heating.

[0032] A bottom plate is provided on the frame, and a rotatable turntable is provided on the bottom plate. The turntable is driven to rotate by a motor below the bottom plate. The stator carrier and the housing carrier are both arranged on the turntable; the stator carrier and the housing carrier are driven by the turntable to be switched among different workstations.

[0033] Each combination of an adjacent stator carrier and housing carrier forms a workstation, and four workstations are evenly distributed on the turntable. The heating machine and the positioning mechanism are arranged corresponding to the same workstation, a stator placing mechanism is arranged corresponding to the second workstation, a cooling mechanism is arranged corresponding to the third workstation, and the fourth workstation is a picking - and - placing workstation.

[0034] The motor hot - sleeving device and its process of the present invention are reasonably designed. By setting the positioning mechanism to correct the minute displacement caused by the expansion of the housing after heating, the concentricity during the process of sleeving the stator is improved, the risk of rubbing when the stator is placed into the housing is effectively reduced, and the assembly effect is improved; in addition, the equipment adopts a four - workstation layout, which greatly improves the production efficiency.

[0035] The heating machine is a high - frequency heating machine. The positioning mechanism includes a first electric cylinder and a housing chuck provided at the lower end of the first electric cylinder. The first electric cylinder is located directly above the induction heating coil of the high - frequency heating machine. The positioning mechanism and the heating structure are integrally and correspondingly arranged, and the correction is efficient.

[0036] The stator placing mechanism includes a second electric cylinder and a stator chuck provided at the lower end of the second electric cylinder; a top plate is provided at the top of the frame, and the first electric cylinder and the second electric cylinder are both movably arranged on the top plate; they are integrally arranged, with a compact structure; being movably arranged is conducive to automated operation.

[0037] Both the housing chuck and the stator chuck are internal - expansion three - jaw chucks, and the operation is stable and reliable.

[0038] Furthermore, the cooling mechanism includes an air duct assembly and a blower that are connected and communicate with each other. The lower end of the air duct assembly is arranged corresponding to the third workstation; during cooling, the air duct assembly can descend and sleeve on the stator assembly, and the cooling is efficient.

[0039] The present invention provides a process for hot - sleeving a stator and a housing using the above - mentioned motor hot - sleeving device, which includes the following steps:

[0040] Step 1: Place the first set of housing and stator on the stator carrier and the housing carrier on the turntable respectively. The turntable rotates 90°. The high - frequency heating machine, together with the induction heating coil, descends. At this time, the induction heating coil sleeves around the housing to be heated, and the high - frequency heating machine heats the housing to a specified temperature.

[0041] Step 2: The first electric cylinder of the positioning mechanism starts to traverse to the final position. At this time, the cylinder body inside the first electric cylinder extends, and the expanding three-jaw chuck inside the casing is placed on the inner wall of the heated casing. Then, the cylinder connected to the expanding three-jaw chuck inside the casing extends, and the three jaws of the expanding three-jaw chuck inside the casing are pushed outwards to make the three jaws contact the inner wall of the casing. After correcting the position of the heated casing, the three jaws contract inwards, and then the cylinder body of the first electric cylinder retracts, taking out the expanding three-jaw chuck inside the casing from the casing, and the first electric cylinder starts to traverse to the initial position;

[0042] Step 3: The turntable rotates 90°. The stator inserting mechanism works to place the expanding three-jaw chuck of the stator core on the inner wall of the stator core, making the three jaws contact the inner wall of the stator core, taking out the stator from the stator positioning seat, putting the clamped stator into the heated casing interior, contracting the three jaws of the expanding three-jaw chuck of the stator core inwards to make the three jaws disengage from the inner wall of the stator core, and taking out the expanding three-jaw chuck of the stator core from the stator, thus completing the process of inserting the stator into the casing;

[0043] Step 4: The turntable rotates 90°. The stator assembly after hot sleeving rotates to the cooling station. The axial flow fan and the air duct assembly are lowered together, making the air duct assembly sleeved on the stator assembly. The axial flow fan operates to form an air flow that sucks air outwards in the air duct assembly, thereby cooling the stator assembly and accelerating the cooling of the casing. After the heating and inserting processes of the previous process are completed, the axial flow fan and the air duct assembly are raised together;

[0044] Step 5: The turntable rotates 90°. The cooled stator assembly is taken off, and a stator and a casing are placed on the empty carrier table, and the work is cycled in sequence.

[0045] As Figures 1 to 4 shown, a preferred specific example of the present invention is:

[0046] For the motor hot sleeving process and its hot sleeving equipment of the present invention, a four-station layout is adopted, integrating four processes of material placement, casing heating, stator hot sleeving, and cooling. The four processes are carried out synchronously, improving the equipment utilization rate and reducing the production beat. Aiming at the problem of scraping caused by non-concentricity during the process of sleeving the stator onto the casing, a three-jaw mechanism is set in the equipment to correct the micro-displacement caused by the expansion of the casing after heating, improving the concentricity during the process of inserting the stator into the casing.

[0047] The specific scheme is as follows: A turntable 2 is arranged on a bottom plate 1. Above the bottom plate 1, a top plate 3 is fixedly connected through support columns. A high-frequency heating machine 4 is arranged on the right side of the bottom plate 1. The turntable 2 is rotationally connected to the bottom plate 1 through a indexing motor. A first electric cylinder 5 and a second electric cylinder 6 are arranged on the top plate 3.

[0048] Four evenly-spaced stator carriers 7 and housing carriers 8 are respectively and alternately arranged on the turntable 1. Each adjacent combination of a stator carrier 7 and a housing carrier 8 forms a working station, and there are a total of four working stations, that is, one working station is set every 90° in the circumferential direction. The front end of the high-frequency heating machine 4 is fixedly connected with an induction heating coil 9. The induction heating coil 9 is located directly above the center of the housing carrier 8 at the 90° working station where the turntable 1 is located. The horizontal movement end position of the first electric cylinder 5 is on the same central axis as the induction heating coil 9 and the housing carrier 8.

[0049] The horizontal movement end position of the second electric cylinder 6 is set directly above the center position of the housing carrier 8 at 180° of the turntable 1, and the initial position of the second electric cylinder 6 is set directly above the center position of the stator carrier 7; a cooling module including an axial flow fan 10 and a duct assembly 11 is provided on the top plate 3 directly above the center position of the housing carrier 8 at 270° of the turntable 1;

[0050] A housing inner expansion type three-jaw chuck 12 connected to a cylinder is provided at the bottom of the first electric cylinder 5, and a stator core inner expansion type three-jaw chuck 13 connected to a cylinder is provided at the bottom of the second electric cylinder 6;

[0051] A stator positioning seat is provided at the top end of the stator carrier 7, and a housing positioning seat is provided at the top end of the housing carrier 8, which can improve the assembly efficiency and assembly effect.

[0052] The specific process is as follows:

[0053] During use, the first set of housing and stator are respectively placed on the stator carrier and the housing carrier on the turntable in sequence. After starting the equipment, the turntable starts to rotate 90°. After reaching the 90° working station, the cylinder at the bottom of the high-frequency heating machine contracts, and the high-frequency heating machine together with the induction heating coil descends. At this time, the induction heating coil is sleeved around the housing to be heated, and the high-frequency heating machine heats the housing to the specified temperature;

[0054] After heating is completed, the cylinder at the bottom of the high-frequency heating machine extends, and the high-frequency heating machine together with the induction heating coil rises. At this time, the translation cylinder connected to the first electric cylinder contracts, and the first electric cylinder starts to horizontally move to the end position. At this time, the cylinder body inside the first electric cylinder extends, and the housing inner expansion type three-jaw chuck is placed on the inner wall of the heated housing. At this time, the cylinder connected to the housing inner expansion type three-jaw chuck extends, and the three jaws of the housing inner expansion type three-jaw chuck are pushed outwards to make the three jaws contact the inner wall of the housing. After the position of the heated housing is corrected, the cylinder contracts, and the three jaws of the housing inner expansion type three-jaw chuck contract inwards. Then the cylinder body of the first electric cylinder retracts, and the housing inner expansion type three-jaw chuck is taken out of the housing. At this time, the translation cylinder connected to the first electric cylinder extends, and the first electric cylinder starts to horizontally move to the initial position (at this time, the process of heating the housing is completed, and the slight displacement caused by the expansion of the housing after heating is corrected, improving the concentricity during the process of inserting the stator).

[0055] Place the second set of the housing and the stator onto the next stator carrier and housing carrier on the turntable in sequence. Start the equipment again. At this time, the first set of the heated housing and stator rotate to the 180° working position. Then, the cylinder body of the second electric cylinder extends, and the internal expanding three-jaw chuck of the stator core is placed on the inner wall of the stator core. Next, the cylinder connected to the internal expanding three-jaw chuck of the stator core extends, and the three jaws of the internal expanding three-jaw chuck of the stator core are pushed outwards to make the three jaws contact the inner wall of the stator core. Then, the cylinder body of the second electric cylinder contracts to take out the stator from the stator positioning seat. At this time, the translation cylinder connected to the second electric cylinder extends, and the second electric cylinder starts to traverse horizontally to the end position. Then, the cylinder body inside the second electric cylinder extends to place the clamped stator into the heated housing. Next, the cylinder connected to the internal expanding three-jaw chuck of the stator core contracts to retract the three jaws of the internal expanding three-jaw chuck of the stator core, so that the three jaws disengage from the inner wall of the stator core. Then, the cylinder body of the second electric cylinder retracts to take out the internal expanding three-jaw chuck of the stator core from the stator. At this time, the translation cylinder connected to the second electric cylinder contracts, and the second electric cylinder starts to traverse horizontally back to the initial position (at this time, the process of putting the stator into the housing is completed, and the housing in the second set of the housing and stator has completed the heating process at the 90° working position);

[0056] Place the third set of the housing and the stator onto the third stator carrier and housing carrier on the turntable in sequence. Start the equipment again. When it rotates to the 180° working position, the first set of the housing and stator that have been put into the housing have become the stator assembly. Then, the lifting cylinder connected to the cooling module contracts to lower the axial flow fan and the air duct assembly together, so that the air duct assembly is sleeved on the stator assembly. The axial flow fan operates to form an air flow that sucks outwards in the air duct assembly, thereby cooling the stator assembly and accelerating the cooling of the housing. After the heating and housing insertion processes of the previous process are both completed, then the lifting cylinder connected to the cooling module extends to raise the axial flow fan and the air duct assembly together (this process can cool the stator assembly, accelerate the contraction of the housing, and make the matching effect between the housing and the stator better);

[0057] Place the fourth set of the housing and the stator onto the fourth stator carrier and housing carrier on the turntable in sequence. Start the equipment again. The turntable rotates 90° again. At this time, the first set of the stator assembly that has completed the hot housing insertion and cooling returns to the 0° position on the turntable and is taken off after completion (through the splitting of the working positions in the whole heating, housing insertion, and cooling processes, the total time is reduced to one-third of the original, effectively improving the production efficiency).

[0058] The above is only an illustration of the preferred embodiments of the present invention. The above technical features can be combined arbitrarily to form multiple embodiment schemes of the present invention.

[0059] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as various non-substantive improvements are made by adopting the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A motor shrink-fit device, comprising a frame, on which a stator carrier and a casing carrier are provided, and a heater for heating the casing, characterized in that: The frame is provided with a positioning mechanism for correcting a slight displacement caused by expansion of the casing after heating.

2. The motor shrink-wrap device according to claim 1, characterized in that: The frame is provided with a bottom plate, the bottom plate is provided with a rotatable turntable, and the stator carrier and the casing carrier are both arranged on the turntable.

3. The motor shrink-wrap device according to claim 2, characterized in that: Each adjacent stator carrier and housing carrier is combined into a work station, and four work stations are evenly distributed on the turntable.

4. The motor shrink-wrap device according to claim 3, characterized in that: The heating machine and the positioning mechanism are arranged corresponding to the same station, the stator placement mechanism is arranged corresponding to the second station, the cooling mechanism is arranged corresponding to the third station, and the fourth station is a pick-and-place station.

5. The motor shrink-wrap device according to claim 4, characterized in that: The heating machine is a high-frequency heating machine, and the positioning mechanism includes a first electric cylinder and a casing chuck arranged at the lower end of the first electric cylinder. The first electric cylinder is located directly above the induction heating coil of the high-frequency heating machine.

6. The motor shrink-wrap device according to claim 4, characterized in that: The cooling mechanism includes a connected air duct assembly and a fan, and the lower end of the air duct assembly is arranged corresponding to the third workstation.

7. The motor shrink-wrap device according to claim 5, characterized in that: The stator insertion mechanism comprises a second electric cylinder and a stator chuck arranged at the lower end of the second electric cylinder.

8. The motor shrink-fit device according to claim 7, characterized in that: A top plate is provided on the top of the frame, and the first electric cylinder and the second electric cylinder are both movably arranged on the top plate.

9. The motor shrink-wrap device according to claim 7, characterized in that: The housing chuck and the stator chuck are both internal expansion type three-jaw chucks.

10. A process for heat shrinking a stator and a housing using the heat shrinking device of any one of claims 1 to 9, characterized in that: The process comprises the following steps: Step 1: Place the first set of housing and stator on the stator carrier and housing carrier on the turntable respectively. The turntable rotates 90°, and the high-frequency heating machine and the induction heating coil descend together. At this time, the induction heating coil is wrapped around the housing to be heated, and the high-frequency heating machine heats the housing to the specified temperature. Step 2: The first electric cylinder of the positioning mechanism begins to move horizontally to the final position. At this time, the cylinder body in the first electric cylinder extends out, and the three-jaw chuck in the casing is placed on the heated inner wall of the casing. At this time, the cylinder connected to the three-jaw chuck in the casing extends out, and the three claws of the three-jaw chuck in the casing are pushed outward, so that the three claws contact the inner wall of the casing. After the position of the heated casing is corrected, the three claws shrink inward, and then the cylinder body of the first electric cylinder retracts, and the three-jaw chuck in the casing is taken out of the casing, and the first electric cylinder begins to move horizontally to the initial position; Step 3: The turntable rotates 90°, and the stator insertion mechanism works to place the stator core internal expansion type three-jaw chuck on the inner wall of the stator core, so that the three claws contact the inner wall of the stator core, and then take the stator out of the stator positioning seat, and put the clamped stator into the heated casing, and then retract the three claws of the stator core internal expansion type three-jaw chuck inwards to separate the three claws from the inner wall of the stator core, and then take the stator core internal expansion type three-jaw chuck out of the stator, and then the stator sleeve process is completed; Step 4: The turntable rotates 90°, and the heat-shrink-fitted stator assembly is rotated to the cooling station. The axial flow fan and the air duct assembly are lowered together, and the air duct assembly is sleeved on the stator assembly. The axial flow fan is turned on to form an airflow in the air duct assembly to draw air outward, thereby cooling the stator assembly and accelerating the cooling of the casing. After the heating and sleeve-fitting processes of the previous process are completed, the axial flow fan and the air duct assembly are raised together; Step 5: Rotate the turntable 90°, remove the cooled stator assembly, and place the stator and casing on an empty carrier, and repeat the process in a cycle.

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