Motor testing device for sewing machine

Abstract

The application relates to a motor testing device of a sewing machine and relates to the field of motor testing, which comprises a detection table and a hand wheel, the detection table is provided with a positioning groove for positioning a stator assembly, the detection table is connected with a first lifting table and a second lifting table through lifting sliding, the first lifting table is rotationally connected with a standard rotor assembly, the stator assembly is coaxial with the standard rotor assembly after positioning, the first lifting table and the second lifting table are respectively located on opposite sides of the stator assembly, the hand wheel is rotationally connected to the second lifting table, a connecting shaft is coaxially fixed on the hand wheel, and the standard rotor assembly is provided with a connecting groove for positioning the connecting shaft. The whole testing process ensures that the shaft center of the stator assembly and the reference rotor is coaxial, effectively inhibits the axial deviation caused by one-side magnetic pulling force, avoids the risk of stator-rotor collision, and significantly improves the stability and testing precision of the detection process.

Description

Technical fields:

[0001] This utility model belongs to the technical field of motor testing, and specifically refers to a motor testing device for sewing machines. Background technology:

[0002] As the power core of sewing equipment, the sewing machine motor can drive the needle to perform relatively precise reciprocating rotation. Therefore, the position of the needle stop when the sewing machine motor stops driving is particularly important. Before installation, the sewing machine motor needs to be tested for the needle stop position to determine the accuracy of the motor rotor's position when it stops.

[0003] Traditional testing methods rely on manual clamping of the stator assembly and rotor combination. During the test, the stator and rotor are prone to offset, adsorption, or even collision due to unilateral magnetic pull, which not only affects the accuracy of the test results but may also damage the components, and needs to be improved. Summary of the Invention:

[0004] The purpose of this invention is to provide a motor testing device for sewing machines to solve the technical problems mentioned in the background section.

[0005] This utility model is implemented as follows:

[0006] A sewing machine motor testing device includes a testing platform and a handwheel. The testing platform has a positioning groove for a stator assembly to be engaged and positioned. A first lifting platform and a second lifting platform are slidably connected to the testing platform. A standard rotor assembly is rotatably connected to the first lifting platform. When the stator assembly is positioned, the stator assembly and the standard rotor assembly are coaxial. The first lifting platform and the second lifting platform are located on opposite sides of the stator assembly. The handwheel is rotatably connected to the second lifting platform. A connecting shaft is coaxially fixed on the handwheel. A connecting groove for the connecting shaft to be engaged and positioned is provided on the standard rotor assembly. A needle stop mark is provided on the handwheel.

[0007] By adopting the above technical solution, during actual testing, after the stator assembly is positioned, the second lifting platform moves closer to and presses against the stator assembly, while the first lifting platform moves to install the standard rotor assembly into the stator assembly. As the first and second lifting platforms move closer to each other, the connecting shaft engages with the connecting groove, making the positioning shaft and the connecting shaft coaxial and fixed. The stator assembly is powered on, simulating the magnetic field interaction between the stator assembly and the rotor during motor operation. The rotor drives the handwheel to rotate synchronously. After running for a certain period of time, the power is turned off, and when the rotor drives the handwheel to stop rotating, the position of the stop needle mark is compared with the preset stop needle position. By using the first lifting platform and the positioning groove to position the standard rotor assembly and the stator assembly respectively, it is less likely that magnetic misalignment or attraction will occur during the test.

[0008] Preferably, the first lifting platform is located below the second lifting platform, and the standard rotor assembly includes a positioning shaft and a reference rotor rotatably connected to the first lifting platform. The positioning shaft is inserted into the shaft hole of the reference rotor and is coaxially fixed with the reference rotor. The connecting groove is formed on the positioning shaft.

[0009] By adopting the above technical solution, when it is necessary to test different models of rotors and stators, the reference rotor can be removed from the positioning column, which makes it easy to replace the reference rotor.

[0010] Preferably, the testing platform has a mounting hole that communicates with the positioning groove. The mounting hole is used to accommodate the reference rotor, and there is a fitting gap between the inner wall of the mounting hole and the reference rotor.

[0011] By adopting the above technical solution, an adaptation gap is left between the mounting hole and the reference rotor, which facilitates the adaptation of reference rotors of different diameters and makes it easy to insert a finger into the adaptation gap to remove the reference rotor.

[0012] Preferably, the second lifting platform is provided with a pressure block, and one end of the connecting shaft near the positioning groove protrudes from the pressure block.

[0013] By adopting the above technical solution, in the actual test process, the second lifting platform drives the pressure block to press the stator assembly, and the connecting shaft protrudes from the pressure block, which makes it easy for the connecting shaft to be inserted into the connecting groove.

[0014] Preferably, the testing platform is provided with an upper drive cylinder for driving the second lifting platform to move up and down. The center of gravity of the second lifting platform, the pressure block and the handwheel is located on the side of the upper drive cylinder close to the standard rotor assembly. The pressure block is provided with a weight reduction groove.

[0015] By adopting the above technical solution and opening the weight reduction groove, it is beneficial to reduce the lateral force on the piston rod of the upper drive cylinder and reduce the friction between the piston and the cylinder wall of the upper drive cylinder.

[0016] Preferably, the weight-reducing groove is arranged around the connecting shaft.

[0017] By adopting the above technical solution, it is beneficial to reduce the friction between the connecting shaft and the pressure block during the testing process.

[0018] Preferably, the second lifting platform is provided with a lifting plate, which is located on the side of the upper drive cylinder near the pressure block and fits against the upper drive cylinder housing.

[0019] By adopting the above technical solution, the support plate is attached to the lifting steel shell, which helps to share the lateral force of the second lifting platform and handwheel on the piston rod of the upper drive cylinder, reduces the friction between the piston of the lifting cylinder and the cylinder wall, and extends the service life of the upper drive cylinder.

[0020] The outstanding advantages of this utility model compared to the prior art are:

[0021] 1. This utility model uses the first lifting platform and the positioning groove to position the standard rotor assembly and stator assembly respectively, so that the deviation and magnetic attraction are not likely to occur during the test.

[0022] 2. This utility model has an adaptation gap between the mounting hole and the reference rotor, which facilitates the adaptation of reference rotors of different diameters and makes it easy to insert a finger into the adaptation gap to remove the reference rotor.

[0023] 3. By creating a weight-reducing groove, this utility model helps to reduce the lateral force on the piston rod of the upper drive cylinder and reduces the friction between the piston and the cylinder wall of the upper drive cylinder. Attached image description:

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the positional structure during testing of this utility model, mainly showing the installation position of the stator assembly;

[0026] Figure 3 This is a structural schematic diagram from another perspective of the present invention, mainly showing the structure at the second lifting platform;

[0027] Figure 4 This invention relates to the connection structure between the standard rotor assembly and the connecting shaft during testing.

[0028] Instruction manual drawing reference numerals: 1. Testing table; 11. Base; 12. Support table; 121. Positioning groove; 122. Mounting hole; 123. Adaptor gap; 2. Handwheel; 21. Connecting shaft; 22. Stop needle mark; 3. First lifting platform; 4. Standard rotor assembly; 41. Positioning shaft; 411. Connecting groove; 42. Reference rotor; 5. Second lifting platform; 51. Pressure block; 511. Weight reduction groove; 52. Lifting plate; 6. Upper drive cylinder; 7. Lower drive cylinder; 8. Stator assembly. Detailed implementation method:

[0029] The present invention will be further described below with reference to specific embodiments:

[0030] This application discloses a motor testing device for a sewing machine. See also... Figure 1 and Figure 2The system includes a testing platform 1 and a handwheel 2. The testing platform 1 includes a base 11 and a support platform 12 mounted on the base 11. The support platform 12 is located above the base 11, and a positioning groove 121 is formed on the upper surface of the support platform 12 for the stator assembly 8 to be inserted and positioned. A mounting hole 122 is formed on the support platform 12, located below the positioning groove 121 and communicating with the positioning groove 121. A lower drive cylinder 7 is fixed on the base 11. A first lifting platform 3 is slidably connected to the base 11 within the mounting hole 122 of the lower drive cylinder 7. The piston rod of the lower drive cylinder 7 is fixedly connected to the first lifting platform 3. The first lifting platform 3 is located above the lower drive cylinder 7, and the lower drive cylinder 7 drives the first lifting platform 3 to rise and fall, and the first lifting platform 3 slides and rises within the receiving groove. The first lifting platform 3 is rotatably connected to the standard rotor assembly 4. The rotation axis of the standard rotor assembly 4 is vertically set. When the stator assembly 8 is inserted into the positioning groove 121, the axis of the stator assembly 8 is coaxial with the axis of the standard rotor assembly 4. The lower drive cylinder 7 drives the first lifting platform 3 to rise so that the standard rotor assembly 4 enters the stator assembly 8.

[0031] See Figure 1 The standard rotor assembly 4 includes a positioning shaft 41 and a reference rotor 42 rotatably connected to the first lifting platform 3. The positioning shaft 41 is engaged with the shaft hole of the reference rotor 42, and the positioning shaft 41 and the reference rotor 42 are coaxially fixedly connected. One end of the positioning shaft 41 away from the base 11 protrudes from the shaft hole of the reference rotor 42. There is an adaptation gap 123 between the inner wall of the mounting hole 122 and the reference rotor 42, and the adaptation gap 123 is set around the outer circumference of the reference rotor 42. This allows the reference rotor 42 and the positioning shaft 41 to be detachably connected, facilitating the replacement of the reference rotor 42 and making it easy to replace different models of reference rotor 42 during actual testing.

[0032] See Figure 1 and Figure 2 A second lifting platform 5 is slidably connected to the base 11. The second lifting platform 5 and the first lifting platform 3 are located on opposite sides of the positioning groove 121, with the first lifting platform 3 located below the second lifting platform 5. An upper drive cylinder 6 is fixed to the base 11, and the second lifting platform 5 is located above the upper drive cylinder 6. The upper drive cylinder 6 and the support platform 12 are horizontally distributed. The piston of the upper drive cylinder 6 is fixedly connected to the second lifting platform 5, and the second lifting platform 5 is slidably connected to the base 11 via the upper drive cylinder 6. A pressure block 51 is fixed to the second lifting platform 5, located on the side of the second lifting platform 5 closest to the positioning groove 121. The pressure block 51 is used to press against the end of the stator assembly 8 away from the support platform 12 to position the stator assembly 8. This ensures stable positioning of the stator assembly 8 and the standard rotor assembly 4 during the test.

[0033] See Figure 1 and Figure 3The handwheel 2 is rotatably connected to the second lifting platform 5. The rotation axis of the handwheel 2 is coaxial with the rotation axis of the positioning shaft 41. The centers of gravity of the second lifting platform 5, the pressure block 51, and the handwheel 2 are all located on the side of the upper drive cylinder 6 near the reference rotor 42. A weight-reducing groove 511 is provided at the end of the pressure block 51 near the positioning groove 121. The weight-reducing groove 511 is used to reduce the lateral force received by the piston of the upper drive cylinder 6 and reduce the friction between the piston and the cylinder wall of the upper drive cylinder 6.

[0034] See Figure 1 and Figure 2 The handwheel 2 is located on the side of the second lifting platform 5 away from the positioning groove 121. A connecting shaft 21 is coaxially fixedly connected to the handwheel 2. The connecting shaft 21 passes through the second lifting platform 5 and the pressure block 51. The end of the connecting shaft 21 near the positioning groove 121 protrudes from the pressure block 51. The weight reduction groove 511 is set around the outer periphery of the connecting shaft 21 to reduce the friction between the pressure block 51 and the connecting shaft 21 when the connecting shaft 21 rotates.

[0035] See Figure 1 and Figure 2 A connecting groove 411 is provided on the upper end face of the positioning shaft 41. The horizontal cross-section of the connecting groove 411 is rectangular. The connecting groove 411 allows one end of the connecting shaft 21 protruding from the pressure block 51 to be engaged and positioned. When the connecting shaft 21 is engaged in the connecting groove 411, the positioning shaft 41 and the connecting shaft 21 are coaxially fixed, causing the rotor to rotate coaxially with the handwheel 2. A stop needle mark 22 is machined on the outer peripheral wall of the handwheel 2. The test results are obtained by observing whether the position of the stop needle mark 22 is consistent with the theoretical stop needle position after the test.

[0036] See Figure 2 and Figure 4 In the actual test, the stator assembly 8 is installed into the positioning slot 121 and connected to the circuit. The first lifting platform 3 and the second lifting platform 5 move closer to the stator assembly 8, so that the pressure block 51 presses the stator assembly 8. The reference rotor 42 is sent into the stator assembly 8, and the connecting shaft 21, which is inserted into the stator assembly 8, is inserted into the connecting slot 411 and fixed coaxially with the positioning shaft 41. The power is turned on, the positioning assembly is powered on, and the rotor rotates to simulate the actual working condition of the motor. After the rotor rotates for a period of time, the power to the stator assembly 8 is turned off. After the rotor stops rotating, the position of the stop needle mark 22 on the handwheel 2 is recorded to see if it is consistent with the theoretical stop needle position.

[0037] During the actual testing process, the operator presets the needle stop position on the second lifting platform. This preset needle stop position can be set according to the actual product requirements. Then, the stator assembly 8 is installed. The first lifting platform 3 and the second lifting platform 5 drive the pressure block 51 and the reference rotor 42 to move closer to each other, so that the connecting shaft 21 and the positioning shaft 41 are coaxially fixed. The stator assembly 8 is energized, and the reference rotor 42 rotates for a period of time under the action of the rotating magnetic field. The stator assembly 8 is de-energized. When the reference rotor 42 drives the handwheel 2 to stop, it is judged whether there is a deviation between the needle stop mark 22 and the preset needle stop position, so as to determine whether the motor is qualified. Then, the first lifting platform 3 and the second lifting platform 5 are reset, the stator assembly 8 is taken out, and the above steps are repeated to test the stator assembly 8 of the next motor.

[0038] Compared with the traditional testing method where each stator assembly 8 corresponds to one rotor for testing, this application is beneficial to improving testing efficiency.

[0039] See 1 and Figure 2 A lifting plate 52 is fixed on the second lifting platform 5. The lifting plate 52 is located below the second lifting platform 5 and is located on the side of the upper drive cylinder 6 near the pressure block 51. The lifting plate 52 is attached to the housing of the upper drive cylinder 6 at the end closest to the upper drive cylinder 6. The lifting plate 52 is slidably connected to the housing of the upper drive cylinder 6, which helps to reduce the friction between the piston rod of the upper drive cylinder 6 and the housing of the upper drive cylinder 6.

[0040] The implementation principle of this application embodiment is as follows: the first lifting platform 3 and the second lifting platform 5 drive the pressure block 51 and the reference rotor 42 to move towards each other, simulating the magnetic field cooperation state between the stator assembly 8 and the rotor when the motor is running. During the testing process, the coaxial connection design of the connecting shaft 21 and the positioning shaft 41 is used to synchronously transmit the rotation of the rotor to the handwheel 2, so that the stop needle position can be directly observed by rotating the handwheel 2. Throughout the test, the coaxiality of the stator assembly 8 and the reference rotor 42 is ensured, effectively suppressing axial displacement caused by unilateral magnetic pull, avoiding the risk of stator-rotor collision, and improving the stability and accuracy of the testing process.

[0041] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A motor testing device for a sewing machine, characterized in that: The device includes a testing platform (1) and a handwheel (2). The testing platform (1) has a positioning groove (121) for the stator assembly (8) to be inserted and positioned. The testing platform (1) is connected to a first lifting platform (3) and a second lifting platform (5) for lifting and sliding. A standard rotor assembly (4) is rotatably connected to the first lifting platform (3). When the stator assembly (8) is positioned, the stator assembly (8) and the standard rotor assembly (4) are coaxial. The first lifting platform (3) and the second lifting platform (5) are located on opposite sides of the stator assembly (8). The handwheel (2) is rotatably connected to the second lifting platform (5). A connecting shaft (21) is coaxially fixed on the handwheel (2). A connecting groove (411) for the connecting shaft (21) to be inserted and positioned is provided on the standard rotor assembly (4). A stop needle mark (22) is provided on the handwheel (2).

2. The sewing machine motor testing device according to claim 1, characterized in that: The first lifting platform (3) is located below the second lifting platform (5). The standard rotor assembly (4) includes a positioning shaft (41) and a reference rotor (42) rotatably connected to the first lifting platform (3). The positioning shaft (41) is inserted into the shaft hole of the reference rotor (42) and is coaxially fixed with the reference rotor (42). The connecting groove (411) is opened on the positioning shaft (41).

3. The sewing machine motor testing device according to claim 2, characterized in that: The testing platform (1) has a mounting hole (122) for accommodating the reference rotor (42). The mounting hole (122) is connected to the positioning groove (121). There is a fitting gap (123) between the inner wall of the mounting hole (122) and the reference rotor (42).

4. The sewing machine motor testing device according to claim 1, characterized in that: The second lifting platform (5) is provided with a pressure block (51), and the end of the connecting shaft (21) near the positioning groove (121) protrudes from the pressure block (51).

5. The sewing machine motor testing device according to claim 4, characterized in that: The testing platform (1) is provided with an upper drive cylinder (6) for driving the second lifting platform (5) to rise and fall. The center of gravity of the second lifting platform (5), the pressure block (51) and the handwheel (2) is located on the side of the upper drive cylinder (6) close to the standard rotor assembly (4). The pressure block (51) is provided with a weight reduction groove (511).

6. The sewing machine motor testing device according to claim 5, characterized in that: The weight reduction groove (511) is arranged around the connecting shaft (21).

7. The sewing machine motor testing device according to claim 5, characterized in that: The second lifting platform (5) is provided with a lifting plate (52), which is located on the side of the upper drive cylinder (6) near the pressure block (51) and fits against the housing of the upper drive cylinder (6).

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