A motor stator shrink-fit assembly tool

Abstract

The utility model discloses a motor stator shrink-fit assembly tool, including a line body tray that moves with the assembly line and a lifting mechanism located below the assembly line, the lifting mechanism is used to lift and lower the line body tray that moves above it. A fixed plate is arranged directly above the lifting mechanism; the fixed plate is connected to the lifting mechanism, the upper surface of the fixed plate is provided with a pneumatic head, and the lower surface is provided with a clamping module that is connected to the pneumatic head and is used to clamp the stator assembly. The assembled stator assembly is transported by the assembly line to a cooling station for cooling, without the need for a robot to grab it. The transportation smoothness is greatly improved, and the axial relative position offset between the casing and the stator assembly is avoided to a great extent.

Description

Technical Field

[0001] The utility model relates to the technical field of motor installation, in particular to a motor stator shrink-fit assembly tool. Background Art

[0002] The stator shrink-fit process uses the principle of thermal expansion and contraction to insert the stator assembly into the heated and expanded casing, and wait for the casing to cool and shrink to form an interference fit with the stator assembly, so that the stator assembly can achieve the required bonding strength. The existing shrink-fit processes all use high-frequency coils to heat the casing, press the stator assembly into the interior of the thermally expanded casing, and then use a robot to grab the assembled stator assembly and place it in the cooling station. At present, new energy motors are gradually eliminating the shrink-fit assembly stop on the inside of the casing, and rely entirely on tooling to ensure the axial relative position of the casing and stator. For motors without assembly stops, when the shrink-fit assembly is not completely cooled, the robot grabbing the stator assembly is likely to cause axial relative position deviation, resulting in poor assembly dimensions of the stator assembly and unqualified products. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a motor stator shrink-fit assembly tool, which solves the problem in the prior art that for motors without assembly stops, the axial relative position is easily offset when grabbing the stator assembly.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] Provided is a motor stator shrink-fit assembly tool, which includes a line body tray that moves with the assembly line and a jacking mechanism located below the assembly line, the jacking mechanism is used to lift and lower the line body tray that moves above it. A fixed plate is arranged directly above the jacking mechanism; the fixed plate is connected to the lifting mechanism, an air head is arranged on the upper surface of the fixed plate, and a clamping module connected to the air head and used to clamp the stator assembly is arranged on the lower surface.

[0006] The beneficial effects of the utility model are as follows: when in use, the housing is placed on the wire tray, and the stator assembly is fixed on the clamping module. The lifting mechanism drives the fixed plate and thus drives the stator assembly to descend, and presses the stator assembly into the housing. After assembly, the lifting mechanism can drive the wire tray to descend, so that the wire tray with the stator assembly is placed in contact with the assembly line, and the wire tray is transported to the cooling station along the assembly line for cooling, without the need for a robot to grab it. Compared with robot grabbing, the smoothness of assembly line transportation is greatly improved, and the axial relative position offset between the housing and the stator assembly is avoided to a great extent.

[0007] Furthermore, a housing positioning assembly is fixedly connected to the center of the upper surface of the wire tray, and the housing positioning assembly includes a disc-shaped support plate and a sleeve fixed to the center of the support plate, and a positioning block that cooperates with a groove on the inner wall of the housing is fixed to the outer surface of the sleeve along the circumferential direction. When in use, the housing is sleeved outside the sleeve and placed on the support plate. The housing is connected to the wire tray and positioned through the housing positioning assembly to ensure that the housing is in the center of the wire tray, and then before assembly, ensure that the housing can be located directly below the stator assembly.

[0008] Furthermore, a bottom plate is fixedly connected to the lower surface of the line body tray, and a slot is provided on the side of the bottom plate perpendicular to the transportation direction of the assembly line; a stopper cooperating with the slot is connected to one side of the jacking mechanism through a lifting power mechanism.

[0009] The beneficial effect of the above technical solution is that the purpose of setting the stopper is to assist the positioning of the line body tray and block the advancement of the line body tray. When the line body tray is transported to the bottom of the fixed plate, the stopper enters the notch to ensure that when the line body tray is transported to the bottom of the fixed plate, it can be stopped by the stopper and remain stationary, and then lifted up by the lifting mechanism and away from the surface of the assembly line.

[0010] Furthermore, a flat-plate placement frame for placing the wire tray is fixedly connected to the top of the lifting mechanism, and at least one pin is provided on the placement frame; a positioning hole matching the pin is provided on the surface of the wire tray. When the lifting mechanism rises, the pin automatically passes through the positioning hole to ensure the accurate position of the wire tray.

[0011] Furthermore, the clamping module includes at least two clamping claw supports evenly arranged in the circumferential direction; an opening for the clamping claw supports to move in parallel is provided on the fixed disk, and the top of the clamping claw supports passes through the opening of the fixed disk and is connected to the pneumatic head. The pneumatic head can drive multiple clamping claw supports to shrink inward or expand outward at the same time, so as to be in close contact with the inner wall of the stator assembly, and realize clamping by static friction.

[0012] Furthermore, a pad is provided on the side of each jaw support, and the hardness of the pad is less than that of the jaw support; the pad is detachably connected to the jaw support through a positioning pin, and the pad is in close contact with the inner wall of the stator assembly during use. The clamping is achieved by hard friction between the pad and the stator assembly. The pad is easy to wear, and it is easy to replace by connecting with the positioning pin.

[0013] Furthermore, at least one push rod is fixedly connected to the lower surface of the fixed disk, and the push rods are evenly arranged along the midpoint of the fixed disk in an annular direction; when in use, the free end of the push rod is in contact with the end surface of the top of the stator assembly. The push rod is used for axial positioning of the stator assembly and applying pressure.

[0014] Furthermore, a pressure sensor is provided in the lifting mechanism, a temperature sensor is provided on one side of the wire tray, and a laser sensor for collecting displacement of the clamping module and the stator assembly is provided above the fixed plate.

[0015] The temperature sensor monitors the temperature change of the casing in real time to ensure that the temperature is too low during assembly and assembly cannot be completed. The pressure sensor monitors the assembly pressure to realize displacement-pressure curve monitoring. If there is a scratch between the stator assembly and the inner side of the casing during assembly, pressure will be generated, and the device will alarm. The laser sensor monitors the displacement stroke of the clamping module and the stator assembly to ensure that the assembly size is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the motor stator shrink-fit assembly tooling;

[0017] Figure 2 This is the isometric drawing of the motor stator shrink fit assembly tooling;

[0018] Figure 3 This is a cross-sectional view after the housing and stator assembly are assembled.

[0019] Among them, 1. pneumatic head, 2. fixed plate, 3. push rod, 4. clamping module, 5. cushion block, 6. positioning pin, 7. casing positioning assembly, 8. line tray, 9. bottom plate, 10. casing, 11. stator assembly; 12. assembly line; 13. lifting mechanism; 14; positioning hole; 15. positioning block; 16. sleeve; 17. support plate; 18. placement rack; 19. notch; 20. clamping claw support. DETAILED DESCRIPTION

[0020] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0021] like Figure 1-3 As shown, the motor stator shrink-fit assembly tooling of the present scheme includes a wire body tray 8 that moves with the assembly line 12 and a lifting mechanism 13 located below the assembly line 12, the lifting mechanism 13 is used to lift and lower the wire body tray 8 that moves above it; a fixed plate 2 is arranged directly above the lifting mechanism 13; the fixed plate 2 is connected to the lifting mechanism, and a pneumatic head 1 is arranged on the upper surface of the fixed plate 2, and a clamping module 4 connected to the pneumatic head 1 and used to clamp the stator assembly 11 is arranged on the lower surface.

[0022] During the assembly process, the clamping module 4 is in close contact with the inner wall of the stator assembly 11. The upper surface of the wire tray 8 is placed with the housing 10, and the lower surface is connected to the lifting mechanism 13. The lifting mechanism 13 drives the wire tray 8 to rise until it is not in contact with the assembly line 12. After the assembly is completed, the stator assembly 11 is pressed into the housing 10 to form a stator assembly. At this time, the lifting mechanism 13 drives the wire tray 8 to descend until the wire tray 8 contacts the assembly line 12 and continues to move with the assembly line 12.

[0023] The line body tray 8 is further transported by the assembly line 12 to the cooling station for cooling without the need for a robot to grab it. Compared with the robot grabbing, the transportation of the assembly line 12 is much smoother and avoids the axial relative position offset between the housing 10 and the stator assembly 11 to a great extent.

[0024] Preferably, the center of the upper surface of the wire tray 8 is fixedly connected with a housing positioning assembly 7, which includes a disc-shaped support plate 17 and a sleeve 16 fixed to the center of the support plate 17, and a positioning block 15 is fixed to the outer surface of the sleeve 16 along the circumferential direction; when in use, the housing 10 is sleeved outside the sleeve 16 and placed on the support plate 17, and the positioning block 15 is matched and connected with the groove on the inner wall of the housing 10. The housing 10 is connected and positioned with the wire tray 8 through the housing positioning assembly 7 to ensure that the housing 10 is in the center of the wire tray 8, and then before assembly, ensure that the housing 10 can be located directly below the stator assembly 11.

[0025] In one embodiment of the utility model, the lower surface of the wire body tray 8 is fixedly connected to the bottom plate 9, and a slot 19 is provided on the side of the bottom plate 9 perpendicular to the transport direction of the assembly line 12; one side of the jacking mechanism 13 is connected to a stopper (not shown in the accompanying drawings) whose size matches the slot 19 through a lifting power mechanism; when the wire body tray 8 is transported to the bottom of the fixed plate 2, the stopper enters the slot 19.

[0026] The stopper is normally raised, and the height of the stopper in the raised state enables the stopper to just enter the slot 19. When the assembly is completed and the line tray 8 needs to enter the next station, the stopper is driven by the lifting power mechanism to drop in height until it does not block the movement of the line tray 8. The purpose of setting the stopper is to assist the positioning of the line tray 8 and block the line tray 8 from moving forward.

[0027] Reference again Figure 1The top of the lifting mechanism 13 is fixedly connected to a flat-plate placement frame 18, and at least one pin is provided on the placement frame 18; the surface of the wire tray 8 is provided with a positioning hole 14 matching the pin; when in use, the wire tray 8 is located on the placement frame 18, and all the pins pass through all the positioning holes 14 respectively. When the lifting mechanism 13 rises, the pins automatically pass through the positioning holes 14 to ensure the accurate position of the wire tray 8. Preferably, 2 to 4 pins are provided, and preferably they are symmetrically arranged along the center line of the surface of the placement frame 18 to facilitate limiting the rotational freedom of the wire tray 8.

[0028] Specifically, the clamping module 4 includes at least two clamping supports 20 evenly arranged along the circumferential direction; an opening for the clamping supports 20 to move in parallel is provided on the fixed disk 2, and the top of the clamping supports 20 passes through the opening of the fixed disk 2 and is connected to the pneumatic head 1. The pneumatic head 1 can drive multiple clamping supports 20 to shrink inward or expand outward at the same time, so as to be in close contact with the inner wall of the stator assembly 11, and achieve clamping by static friction. The number of clamping supports 20 is preferably 3 to 4, evenly distributed along 360°, and can clamp in multiple directions.

[0029] A pad 5 is provided on the side of each clamping jaw support 20, and the hardness of the pad 5 is less than that of the clamping jaw support 20; the pad 5 is detachably connected to the clamping jaw support 20 through the positioning pin 6, and the pad 5 is in close contact with the inner wall of the stator assembly 11 during use. The clamping is mainly achieved by the hard friction between the pad 5 and the stator assembly 11.

[0030] The pad 5 is preferably made of a material with low hardness but not soft, such as a plastic block, to avoid the material being too hard to damage the stator assembly 11, and to avoid the material being too soft to collapse and deform under pressure. The pad 5 is easy to wear, and is connected by the positioning pin 6 for easy replacement. The positioning pin 6 is in close contact with the pin hole on the clamping claw support 20 to prevent the pad 5 from falling. The positioning pin 6 can be an elastic pin with a forked structure, which can automatically press against the pin hole by its own elasticity; pinching all the forked structures at the same time can reduce the diameter of the positioning pin 6 and make it easy to disassemble.

[0031] As a preferred embodiment of the present scheme, at least one push rod 3 for axial positioning and applying pressure to the stator assembly 11 is fixedly connected to the lower surface of the fixed disk 2, and the push rod 3 is evenly arranged in the circumferential direction along the midpoint of the fixed disk 2; when in use, the free end of the push rod 3 is in contact and connected with the end face of the top end of the stator assembly 11.

[0032] The clamping module 4 only applies radial pressure to the inner wall of the stator assembly 11 and cannot achieve axial positioning. Each time the stator assembly 11 is installed, it contacts the push rod 3, so that the stator assembly 11 can be installed at a certain axial position. When the lifting mechanism is driven to lift, it can move downward at a predetermined set value displacement, and the assembly accuracy is higher. In addition, the clamping module 4 is not convenient for applying axial pressure to the stator assembly 11, and it is not convenient for pressing the stator assembly 11 downward, while the push rod 3 can apply axial pressure to the stator assembly 11, so that the stator assembly 11 is pressed downward. Preferably, there are 2 to 3 push rods 3 so that the stator assembly 11 is evenly stressed.

[0033] A pressure sensor for monitoring whether there is any scratch between the stator assembly 11 and the casing 10 is provided in the lifting mechanism 13, a temperature sensor for monitoring the temperature of the casing 10 is provided on one side of the wire tray 8, and a laser sensor for collecting the displacement of the clamping module 4 and the stator assembly 11 is provided above the fixed plate 2.

[0034] The temperature sensor monitors the temperature change of the housing 10 in real time to ensure that the housing cannot be assembled if the temperature is too low. The pressure sensor monitors the assembly pressure to realize the displacement-pressure curve monitoring. If the stator assembly 11 scrapes against the inner side of the housing during the assembly movement, pressure will be generated, and the device will alarm. The laser sensor monitors the displacement stroke of the clamping module 4 and the stator assembly 11 to ensure that the assembly size is qualified. The temperature sensor, pressure sensor and laser sensor are all existing sensor models on the market.

[0035] The assembly line can be a conveyor roller, conveyor belt or other transport mechanism. The steps of complete stator shrink fitting are:

[0036] S1, the stator assembly 11 is connected to the clamping module 4 in advance;

[0037] S2, the wire body tray 8 with the housing 10 is first heated in the previous heating station, and then transported through the assembly line 12 until the housing 10 after thermal expansion reaches directly below the stator assembly 11;

[0038] S3, the lifting mechanism 13 rises and lifts and fixes the line body tray 8, so that the line body tray 8 is separated from the assembly line 12 to avoid being further transported;

[0039] S4, the lifting mechanism drives the fixing plate 2 and thus drives the stator assembly 11 to slowly descend and press into the housing 10 until the stator assembly 11 reaches a preset assembly position;

[0040] S5, the clamping module 4 is retracted under the drive of the pneumatic head 1, and the fixed plate 2 is retracted under the drive of the lifting mechanism;

[0041] S6, the lifting mechanism 13 retreats, and the wire tray 8 falls back onto the assembly line 12; S7, the assembled stator assembly flows into the next cooling station together with the wire tray 8.

[0042] In summary, the lifting mechanism 13 in this solution can drive the wire tray 8 to rise and fall. The raised wire tray 8 can ensure that the housing 10 and the stator assembly 11 complete the assembly process in a static state, and the lowered wire tray can drive the stator assembly to continue to follow the assembly line and be smoothly transported to the next cooling station. The axial relative position offset between the stator assembly 11 and the housing 10 is avoided to a great extent.

Claims

1. A motor stator shrink-fit assembly tool, characterized in that: The invention comprises a wire tray (8) moving with an assembly line (12) and a lifting mechanism (13) located below the assembly line (12), wherein the lifting mechanism (13) is used to lift and lower the wire tray (8) moving above the lifting mechanism (13); a fixed disk (2) is arranged directly above the lifting mechanism (13); the fixed disk (2) is connected to the lifting mechanism, an air head (1) is arranged on the upper surface of the fixed disk (2), and a clamping module (4) connected to the air head (1) and used to clamp a stator assembly (11) is arranged on the lower surface.

2. The motor stator shrink-fit assembly tool according to claim 1, characterized in that: The center of the upper surface of the wire tray (8) is fixedly connected to a housing positioning assembly (7), wherein the housing positioning assembly (7) comprises a disc-shaped support plate (17) and a sleeve (16) fixed to the center of the support plate (17), and a positioning block (15) that cooperates with a groove on the inner wall of the housing (10) is fixed to the outer surface of the sleeve (16) along the circumferential direction.

3. The motor stator shrink-fit assembly tool according to claim 1, characterized in that: The lower surface of the line body tray (8) is fixedly connected to a bottom plate (9), and a notch (19) is provided on the side of the bottom plate (9) perpendicular to the transport direction of the assembly line (12); one side of the jacking mechanism (13) is connected to a stopper that cooperates with the notch (19) through a lifting power mechanism.

4. The motor stator shrink-fit assembly tool according to claim 1, characterized in that: A flat-plate-shaped placement frame (18) for placing the wire tray (8) is fixedly connected to the top of the lifting mechanism (13), and at least one pin is provided on the placement frame (18); a positioning hole (14) matching the pin is provided on the surface of the wire tray (8).

5. The motor stator shrink-fit assembly tool according to claim 1, characterized in that: The clamping module (4) comprises at least two clamping jaw supports (20) uniformly arranged in a circumferential direction; an opening for the clamping jaw support (20) to move in parallel is provided on the fixed disk (2), and the top of the clamping jaw support (20) passes through the opening of the fixed disk (2) and is connected to the pneumatic head (1).

6. The motor stator shrink-fit assembly tool according to claim 5, characterized in that: A cushion block (5) is provided on the side of each of the clamping jaw supports (20), and the hardness of the cushion block (5) is less than the hardness of the clamping jaw support (20); the cushion block (5) is detachably connected to the clamping jaw support (20) via a positioning pin (6), and when in use, the cushion block (5) is in close contact with the inner wall of the stator assembly (11).

7. The motor stator shrink-fit assembly tool according to claim 1, characterized in that: At least one push rod (3) is fixedly connected to the lower surface of the fixed disk (2), and the push rods (3) are evenly arranged in a circumferential direction along the midpoint of the fixed disk (2); when in use, the free end of the push rod (3) is in contact with the end surface of the top end of the stator assembly (11).

8. The motor stator shrink-fit assembly tool according to claim 1, characterized in that: A pressure sensor is arranged inside the lifting mechanism (13), and a temperature sensor is arranged on one side of the wire tray (8); a laser sensor for collecting displacement of the clamping module (4) and the stator assembly (11) is arranged above the fixed plate (2).

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