A device for detecting the axial pressing and separating force of the magnetic steel of a motor rotor

Abstract

A device for detecting the axial pressing and separating force of a motor rotor magnet, comprising a frame which consists of a top plate, a bottom plate and columns. Two guide columns are arranged between the top plate and the bottom plate. A lifting plate is slidably engaged with the two guide columns. A pushing device is arranged on the top plate. The lifting plate is fixedly connected to the push rod of the pushing device through a mounting bracket. Two pressing and separating air cylinders are mounted on the mounting bracket. The piston rods of the two pressing and separating air cylinders are each connected with a magnet pressing head. The magnet pressing head is located below the lifting plate. A pre-pressing contact extending downward is slidably engaged on the lifting plate. The pre-pressing contact is located between the two magnet pressing heads. A buffer spring is arranged on the pre-pressing contact. A rotating table for fixing the motor rotor is arranged on the bottom plate. The rotating table is circumferentially positioned and axially movably connected to a rotating shaft. A compression spring is arranged between the rotating shaft and the rotating table. The rotating shaft is connected to a rotating motor mounted below the bottom plate. Two potentiometers are arranged on the bottom plate. The probes of the two potentiometers are symmetrically arranged on both sides of the rotating table.

Description

Technical Field

[0001] The present invention belongs to the field of magnetic steel press-off detection, and particularly relates to a device for detecting the axial press-off force of the magnetic steel of an electric motor rotor. Background Art

[0002] Permanent magnetic steel is often arranged on the electric motor rotor to provide a magnetic field. The magnetic steel is a powder metallurgy product with certain tolerances. The magnetic steel is inserted into the rotor hole or groove and fixed by special glue to ensure the bonding strength. During the manufacturing process of the electric motor rotor, it is necessary to test the press-off force of the magnetic steel around the rotor to ensure reliability.

[0003] At present, the existing magnetic steel press-off force detection devices will cause certain damage to the magnetic steel itself, and it is not conducive to screening magnetic steel without glue and missing magnetic steel. In addition, in the existing equipment, the adjustable range of the press-off force is not large or the press-off force cannot be adjusted, resulting in inaccurate detection of the bonding performance of the magnetic steel. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for detecting the axial press-off force of the magnetic steel of an electric motor rotor in view of the deficiencies of the existing technology, so as to solve the problems of screening magnetic steel without glue and missing magnetic steel and improving the accuracy of detecting the bonding performance of the magnetic steel.

[0005] To achieve the above object, the present invention provides the following technical solution: A device for detecting the axial press-off force of the magnetic steel of an electric motor rotor, including a frame, the frame is composed of a top plate, a bottom plate, and columns. Two guide columns are arranged between the top plate and the bottom plate. A lifting plate is slidably matched with the two guide columns. A pushing device is arranged on the top plate. The lifting plate is fixedly connected to the push rod of the pushing device through a mounting bracket. Two press-off air cylinders are installed on the mounting bracket. The piston rods of the two press-off air cylinders are respectively connected with a magnetic steel press head. The magnetic steel press head is located below the lifting plate. A pre-pressure contact extending downward is slidably matched on the lifting plate. The pre-pressure contact is located between the two magnetic steel press heads. A buffer spring is arranged on the pre-pressure contact. A rotating table for fixing the electric motor rotor is arranged on the bottom plate. The rotating table is circumferentially positioned and axially movably connected with a rotating shaft. A compression spring is arranged between the rotating shaft and the rotating table. The rotating shaft is connected with a rotating motor installed below the bottom plate. Two potentiometers are arranged on the bottom plate. The probes of the two potentiometers are symmetrically arranged on both sides of the rotating table.

[0006] Preferably, the rotating shaft is arranged in a bearing seat, and bearings are arranged at both open ends of the bearing seat to support the rotating shaft.

[0007] Preferably, an in-situ screw is arranged on the rotating shaft, and the in-situ screw cooperates with an in-situ sensor fixedly installed below the bearing seat.

[0008] Preferably, a coupling is provided between the rotating shaft and the rotating motor.

[0009] Preferably, the rotating shaft is disposed in a bearing cavity, and bearings are provided at both ends of the bearing cavity to support the rotating shaft.

[0010] Preferably, an anti-rotation groove block is provided on the rotating table to prevent the circumferential rotation of the motor rotor.

[0011] Preferably, a magnet steel limiting disk is fixedly installed on the bottom plate to limit the position of the rotating table.

[0012] Preferably, a fixed rod is further provided on the bottom plate, and a sensor is slidably disposed on the fixed rod to detect whether the product can be started.

[0013] Preferably, the pushing device is a hydraulic cylinder or a pneumatic cylinder.

[0014] Preferably, the height of the pre-pressure contact is lower than or equal to the height of the magnet steel pressure head.

[0015] Adopting the above solution, a device for detecting the axial pressing-off force of a magnet steel of a motor rotor includes a frame, the frame is composed of a top plate, a bottom plate, and columns, two guiding columns are provided between the top plate and the bottom plate, a lifting plate is slidably engaged with the two guiding columns, a pushing device is provided on the top plate, the lifting plate is fixedly connected to the push rod of the pushing device through a mounting bracket, two pressing-off pneumatic cylinders are mounted on the mounting bracket, the piston rods of the two pressing-off pneumatic cylinders are respectively connected with magnet steel pressure heads, the magnet steel pressure heads are located below the lifting plate, a pre-pressure contact extending downward is slidably engaged on the lifting plate, the pre-pressure contact is located between the two magnet steel pressure heads, a buffer spring is provided on the pre-pressure contact, the height of the pre-pressure contact is lower than or equal to the height of the magnet steel pressure head, a rotating table for fixing the motor rotor is provided on the bottom plate, an anti-rotation groove block is provided on the rotating table to prevent the circumferential rotation of the motor rotor, the rotating table is circumferentially positioned and axially movably connected with a rotating shaft, a compression spring is provided between the rotating shaft and the rotating table, the rotating shaft is connected with a rotating motor installed below the bottom plate, an in-situ screw is provided on the rotating shaft, and the in-situ screw cooperates with an in-situ sensor fixedly installed below the bearing seat, the in-situ sensor is used to ensure that the magnet steel pressure head is directly opposite to the center of the magnet steel when pressing down and to complete all magnet steel tests with correct indexing. Two potentiometers are provided on the bottom plate, and the probes of the two potentiometers are symmetrically arranged on both sides of the rotating table. Using this device can solve the problems of screening unglued magnet steels and missed-installed magnet steels, and can effectively improve the efficiency of detecting magnet steels. Description of the Drawings

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2Schematic structural diagram of the present invention;

[0018] Figure 3 is Figure 2 A - A cross-sectional view of

[0019] Figure 4 Schematic structural diagram of the present invention;

[0020] Figure 5 is Figure 2 B - B cross-sectional view of

[0021] In the figure: 1 is the frame, 1a is the bottom plate, 1b is the guide post, 1c is the top plate, 1d is the lifting plate, 1e is the column, 2 is the pressing and releasing air cylinder, 3 is the mounting bracket, 4 is the pre-pressing contact, 5 is the buffer spring, 6 is the rotating shaft, 7 is the compression spring, 8 is the rotating motor, 9 is the potentiometer, 9a is the probe, 10 is the pushing device, 11 is the bearing seat, 12 is the bearing, 13 is the in-situ screw, 14 is the in-situ slave sensor, 15 is the coupling, 16 is the anti-rotation groove block, 17 is the magnetic steel limit disk, 18 is the fixed rod, 19 is the sensor, 20 is the magnetic steel pressing head, 21 is the buffer spring. Specific embodiments

[0022] See Figures 1 to 5, A device for detecting the axial press-off force of the magnetic steel of a motor rotor, comprising a frame 1. The frame 1 is composed of a top plate 1c, a bottom plate 1a, and columns 1e. Between the top plate 1c and the bottom plate 1a, there are two guide columns 1b. A lifting plate 1d is slidably fitted with the two guide columns 1b. On the top plate 1c, there is a pushing device 10. The pushing device 10 is a hydraulic cylinder or a pneumatic cylinder. Taking this embodiment as an example, the pushing device 10 is a pneumatic cylinder. The lifting plate 1d is fixedly connected to the push rod of the pushing device 10 through a mounting bracket 3. Two press-off pneumatic cylinders 2 are installed on the mounting bracket 3. The piston rods of the two press-off pneumatic cylinders 2 are each connected with a magnetic steel press head 20. The magnetic steel press head 20 is located below the lifting plate 1d. A pre-pressure contact 4 extending downward is slidably fitted on the lifting plate 1d. The pre-pressure contact 4 is located between the two magnetic steel press heads 20. A buffer spring 21 is arranged on the pre-pressure contact 4. The height of the pre-pressure contact 4 is lower than or equal to the height of the magnetic steel press head 20. On the bottom plate 1a, there is a rotating table 5 for fixing the motor rotor. On the rotating table 5, there is an anti-rotation groove block 16 for preventing the circumferential rotation of the motor rotor. The rotating table 5 is circumferentially positioned and axially movably connected to a rotating shaft 6. A compression spring 7 is arranged between the rotating shaft 6 and the rotating table 5. The rotating shaft 6 is connected to a rotating motor 8 installed below the bottom plate 1a. A coupling 15 is arranged between the rotating shaft 6 and the rotating motor 8. The coupling 15 can play a role in buffering, shock absorption, and improving the dynamic performance of the rotating shaft 6. The rotating shaft 6 is arranged in a bearing housing 11. At the two open ends of the bearing housing 11, there are bearings 12 for supporting the rotating shaft 6. At the same time, the bearing housing 11 can also play a role in protecting the rotating shaft 6. Two potentiometers 9 are arranged on the bottom plate 1a. The probes 9a of the two potentiometers 9 are symmetrically arranged on both sides of the rotating table 5.

[0023] See Figure 5 , A fixing rod 18 is also arranged on the bottom plate 1a. A sensor 19 is slidably arranged on the fixing rod 18 for detecting whether the product can be started. An in-situ screw 13 is arranged on the rotating shaft 6. The in-situ screw 13 cooperates with an in-situ sensor 14 fixedly installed below the bearing housing 11. The in-situ screw 13 and the in-situ sensor 14 are to ensure that the magnetic steel press head 20 is directly opposite to the center of the magnetic steel when pressing down, and all magnetic steel tests can be completed with the correct indexing. A magnetic steel limit disc 17 is fixedly installed on the bottom plate 1a for restricting the position of the rotating table 5.

[0024] During operation, the pushing device 10 drives the two press-off pneumatic cylinders 2, the mounting bracket 3, the pre-pressure contact 4, and the magnetic steel press head 20 to descend as a whole. During the downward pressing process, the probes 9a of the potentiometers 9 are compressed by a certain distance. Since the probes 9a of the potentiometers 9 always keep pressing against the lower end face of the motor rotor, any slight misalignment of the magnetic steel after the press-off force is applied can be fed back by the potentiometer to the device to indicate insufficient magnetic steel bonding strength, so as to complete the work.

[0025] The above are only embodiments of the present invention. This device can improve the working efficiency of sewage suction, prevent the mud-water separation device from being blocked, and reduce the labor intensity of staff. For those skilled in the art, the deformations and improvements made without departing from the structure of the present invention are equally regarded as the protection scope of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims

1. A detecting device for the axial pressing-off force of a motor rotor magnet, comprising a frame (1), characterized in that: The frame (1) is composed of a top plate (1c), a bottom plate (1a), and columns (1e). Between the top plate (1c) and the bottom plate (1a), there are two guide columns (1b). A lifting plate (1d) is slidably engaged with the two guide columns (1b). A pushing device (10) is arranged on the top plate (1c). The lifting plate (1d) is fixedly connected to the push rod of the pushing device (10) through a mounting bracket (3). Two pressing-off force cylinders (2) are mounted on the mounting bracket (3). The piston rods of the two pressing-off force cylinders (2) are each connected with a magnet pressing head (20). The magnet pressing head (20) is located below the lifting plate (1d). A pre-pressing contact (4) extending downward is slidably engaged on the lifting plate (1d). The pre-pressing contact (4) is located between the two magnet pressing heads (2a). A buffer spring (21) is arranged on the pre-pressing contact (4). A rotating table (5) for fixing the motor rotor is arranged on the bottom plate (1a). The rotating table (5) is circumferentially positioned and axially movably connected to a rotating shaft (6). A compression spring (7) is arranged between the rotating shaft (6) and the rotating table (5). The rotating shaft (6) is connected to a rotating motor (8) installed below the bottom plate (1a). Two potentiometers (9) are arranged on the bottom plate (1a). The probes (9a) of the two potentiometers (9) are symmetrically arranged on both sides of the rotating table (5).

2. A detecting device for the axial pressing-off force of a motor rotor magnet according to claim 1, characterized in that: The rotating shaft (6) is arranged in a bearing seat (11). Bearings (12) are arranged at both open ends of the bearing seat (11) for supporting the rotating shaft (6).

3. A detecting device for the axial pressing-off force of a motor rotor magnet according to claim 1, characterized in that: An in-situ screw (13) is arranged on the rotating shaft (6), and the in-situ screw (13) cooperates with an in-situ sensor (14) fixedly installed below the bearing seat (11).

4. A detecting device for the axial pressing-off force of a motor rotor magnet according to claim 1, characterized in that: A coupling (15) is arranged between the rotating shaft (6) and the rotating motor (8).

5. A detecting device for the axial pressing-off force of a motor rotor magnet according to claim 1, characterized in that: An anti-rotation groove block (16) is arranged on the rotating table (5) to prevent the circumferential rotation of the motor rotor.

6. A detecting device for the axial pressing-off force of a motor rotor magnet according to claim 1, characterized in that: A magnet limit disk (17) is fixedly installed on the bottom plate (1a) to limit the position of the rotating table (5).

7. A detecting device for the axial pressing-off force of a motor rotor magnet according to claim 1, characterized in that: A fixed rod (18) is further arranged on the bottom plate (1a). A sensor (19) is slidably arranged on the fixed rod (18) to detect whether the product can be started.

8. A detecting device for the axial pressing-off force of a motor rotor magnet according to claim 1, It is characterized in that: The pushing device (10) is a hydraulic cylinder or a pneumatic cylinder.

9. An axial pressure release force detection device for a motor rotor permanent magnet according to claim 1, It is characterized in that: The height of the preloading contact (4) is lower than or equal to the height of the permanent magnet press head (3).

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