A sample preparation machine used for twisting internal enameled wires in compatibility testing

Abstract

The present invention discloses a sample preparation machine for twisting internal enameled wire in a compatibility test. The sample preparation machine includes a base, a servo motor, a diameter measuring module, a torque motor, a linear motion mechanism, and an enameled wire fixing block. The servo motor is mounted at one end of the base, the diameter measuring module is mounted in the middle of the base, the linear motion mechanism is mounted at the other end of the base, the enameled wire fixing block is mounted on the linear motion mechanism and is located above the base, the enameled wire fixing block is provided with a fixing mechanism, and the torque motor is connected to the linear motion mechanism. During sample preparation, the diameter of the enameled wire is measured by the diameter measuring module, the servo motor rotates a corresponding number of turns according to the diameter of the enameled wire to twist the enameled wire, and the torque motor provides a corresponding torque according to the diameter of the enameled wire, so that the enameled wire fixing block can provide a corresponding pulling force to the enameled wire during the twisting process. The present invention improves sample preparation efficiency and produces high consistency of samples.

Description

Technical Field

[0001] This invention relates to the field of compatibility testing technology, and more specifically to a sample preparation machine used in compatibility testing to twist internal enameled wires. Background Technology

[0002] Enamelled wire is a type of wire in which a conductive core is encased in an insulating layer. This insulation layer possesses properties such as heat resistance, abrasion resistance, and insulation, protecting the conductive core and ensuring its performance under high temperature and high pressure environments. Enamelled wire is an indispensable component in equipment such as compressors, and its performance directly affects the reliability and service life of the compressor. To ensure that enamelled wire provides effective insulation protection during actual operation, compatibility testing is required according to the clauses in Appendix BB of the compressor safety standard IEC 60335-2-34:2021.

[0003] Before testing, the enameled wire needs to be folded in half and twisted according to Clause 4.4 of IEC 60851-5:2008+AMD1:2011+AMD2:2019. The twisted length should be 125±5 mm. The twisting process requires selecting the appropriate number of twists and load based on the diameter of the enameled wire. Finally, the sample is prepared. During testing, a test voltage is applied between the conductors of the enameled wire according to Clause 4.1 to test the breakdown voltage.

[0004] In the industry, samples are typically prepared by manually twisting enameled wire.

[0005] However, manually twisting enameled wire to prepare samples has the following drawbacks:

[0006] 1. Manual sample preparation involves repetitive steps, which can be labor-intensive when there is a high demand for samples;

[0007] 2. When the number of twists in the enameled wire is large, errors are more likely to occur, leading to rework;

[0008] 3. Manual sample preparation is less efficient;

[0009] 4. The consistency of artificially prepared samples is poor.

[0010] All of the above-mentioned defects will ultimately interfere with the test results. Summary of the Invention

[0011] The purpose of this invention is to provide a sample preparation machine for twisting internal enameled wires in compatibility testing, which improves sample preparation efficiency and produces samples with high consistency.

[0012] The objective of this invention is achieved through the following technical solution:

[0013] A sample preparation machine for twisting internal enameled wire in compatibility testing is characterized by comprising a base, a servo motor, a diameter measuring module, a torque motor, a linear motion mechanism, and an enameled wire fixing block. The servo motor is mounted at one end of the base, with its rotation shaft extending laterally and equipped with a hook structure for catching the folded enameled wire. The diameter measuring module is mounted in the middle of the base, and the linear motion mechanism is mounted at the other end of the base. The enameled wire fixing block is mounted on the linear motion mechanism and located above the base. The linear motion mechanism drives the enameled wire fixing block away from or towards the servo motor. The enameled wire fixing block is equipped with a fixing mechanism for fixing the two ends of the folded enameled wire. The torque motor is connected to the linear motion mechanism. During sample preparation, the diameter of the enameled wire is measured by the diameter measuring module. The servo motor rotates a corresponding number of revolutions according to the diameter of the enameled wire to twist it. The torque motor provides a corresponding torque according to the diameter of the enameled wire, enabling the enameled wire fixing block to provide a corresponding pulling force to the enameled wire during the twisting process.

[0014] A further technical solution of the present invention is as follows: the fixing mechanism includes a rotating column and two baffles. The two baffles are fixed relative to each other on the top of the enameled wire fixing block. The rotating column is vertically rotatably disposed between the two baffles. The rotating column is provided with cam surfaces on the sides corresponding to the two baffles. The gap between the cam surfaces and the baffles can be adjusted by rotating the rotating column. The gap between the cam surfaces and the baffles is used to tighten the end of the enameled wire.

[0015] A further technical solution of the present invention is: a lever is connected to the rotating column, and the rotating column can be driven to rotate by moving the lever.

[0016] A further technical solution of the present invention is as follows: a flat groove is provided on the side of the enameled wire fixing block, the inner end of the flat groove extends into the interior of the enameled wire fixing block, the lower end of the rotating column is located at the inner end of the flat groove, the lever is located in the flat groove, one end of the lever is fixedly connected to the lower end of the rotating column, and the other end of the lever extends out of the flat groove.

[0017] A further technical solution of the present invention is as follows: two diameter measuring modules are provided in the middle of the base, and the two diameter measuring modules are respectively used to measure the diameter of the two halves of the folded enameled wire. A triangular dividing block is provided in the middle of the base, and the triangular dividing block is located between the diameter measuring module and the servo motor, with the tip of the triangular dividing block facing the rotation axis of the servo motor.

[0018] A further technical solution of the present invention is as follows: the diameter measuring module includes a fixed plate, a movable plate, a pressure sensor, an infrared ranging module, and a driving mechanism. A fixed seat is provided in the middle of the base. The fixed plate and the movable plate are mounted opposite each other on the fixed seat. The movable plate can move relative to the fixed plate. The driving mechanism is used to drive the movable plate to move linearly. The pressure sensor and the infrared ranging module are respectively provided on the fixed plate. The pressure sensor is used to measure the pressure on the fixed plate, and the infrared ranging module is used to measure the distance between the fixed plate and the movable plate.

[0019] A further technical solution of the present invention is as follows: the linear motion mechanism includes a transmission wheel set and a transmission belt. The transmission wheel set is located inside the base, the transmission belt is installed on the transmission wheel set and protrudes above the base, the lower part of the enameled wire fixing block is fixedly connected to the transmission belt, and the output shaft of the torque motor is connected to the transmission wheel set.

[0020] A further technical solution of the present invention is as follows: a motor mounting base is provided on the base, a servo motor is installed in the motor mounting base, and a display is provided on the top of the motor mounting base for displaying the number of rotations of the servo motor and the diameter measured by the diameter measurement module.

[0021] A further technical solution of the present invention is as follows: the side of the motor mounting base is provided with a motor start button, a motor stop button and a motor reset button for controlling the servo motor.

[0022] A further technical solution of the present invention is: the hook structure includes a groove provided on the side wall of the rotating shaft of the servo motor.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In this invention, during sample preparation, the folded enameled wire is hooked onto the rotating shaft of a servo motor, and both ends of the folded wire are fixed to an enameled wire fixing block to complete the installation. Then, the diameter of the enameled wire is measured by a diameter measuring module. The servo motor rotates a corresponding number of turns according to the wire diameter to twist the wire, and a torque motor provides a corresponding torque based on the wire diameter, allowing the fixing block to provide the appropriate tension to the twisted wire, thus completing the twisting process. It is evident that this invention can automatically complete the twisting and sample preparation of enameled wire, resulting in samples that better meet the requirements of the standard and exhibit high consistency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the sample preparation machine according to an embodiment of the present invention;

[0026] Figure 2 This is a top view of the diameter measurement module in an embodiment of the present invention;

[0027] Figure 3This is a schematic diagram of the assembly structure of the linear moving mechanism and the enameled wire fixing block according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the operation of the fixing mechanism according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the servo motor's rotating shaft hooking onto the folded enameled wire in an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the structure of the sample preparation machine in this embodiment of the invention when twisting the enameled wire.

[0031] Meaning of the labels in the attached diagram:

[0032] 1-Base; 1.1-Mounting slot; 2-Motor mounting base; 3-Display; 4-Servo motor; 4.1-Servo motor rotation shaft; 4.2-Groove; 5-Triangular dividing block; 6-Diameter measuring module; 6.1-Fixed plate; 6.2-Moving plate; 7-Fixed seat; 8-Rotating column; 8.1-Cam surface; 9-Baffle; 10-Enameled wire fixing block; 10.1-Flat groove; 11-Linear movement mechanism; 11.1-Transmission wheel; 11.2-Transmission belt; 12-Toggle lever; 13-Motor start button; 14-Motor stop button; 15-Motor reset button; 16-Torque motor; 17-Enameled wire; 17.1-Circle; 17.2-End of enameled wire. Detailed Implementation

[0033] The present invention will be further described below with reference to embodiments.

[0034] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0037] Example:

[0038] like Figures 1 to 5 The sample preparation machine shown in this embodiment is used to twist internal enameled wires in compatibility testing. It includes a base 1, a servo motor 4, a diameter measuring module 6, a torque motor 16, a linear movement mechanism 11, and an enameled wire fixing block 10.

[0039] A motor mounting base 2 is provided on one end of the base 1. The servo motor 4 is mounted in the motor mounting base 2, and the rotation shaft 4.1 of the servo motor extends laterally from the side of the motor mounting base 2 facing the other end of the base 1. The rotation shaft 4.1 of the servo motor is provided with a hook structure for hooking the folded enameled wire 17. Figure 5 As shown, the hook structure includes a groove 4.2 on the side wall of the rotating shaft 4.1 of the servo motor.

[0040] like Figure 2 As shown, one end of the folded enameled wire 17 will form a circle 17.1, and the other end will be the end of the enameled wire 17.2. When making the sample, the circle 17.1 at one end of the folded enameled wire 17 will fit into the groove 4.2.

[0041] In this embodiment, a display 3 is provided on the top of the motor mounting base 2 to display the number of rotations of the servo motor 4 and the diameter measured by the diameter measurement module 6. The side of the motor mounting base 2 is provided with a motor start button 13, a motor stop button 14 and a motor reset button 15 for controlling the servo motor. The motor start button 13, the motor stop button 14 and the motor reset button 15 are used to control the servo motor 4 in manual operation.

[0042] A fixing seat 7 is provided in the middle of the base 1. In this embodiment, two diameter measuring modules 6 are arranged side by side on the fixing seat 7. The two diameter measuring modules 6 are used to measure the diameter of the two halves of the folded enameled wire 17. When making the sample, the average value measured by the two diameter measuring modules 6 is used as the final diameter of the enameled wire.

[0043] A triangular dividing block 5 is also provided on the top of the fixing base 7. The triangular dividing block 5 is located on the side of the fixing base 7 closest to the servo motor 4, that is, between the diameter measuring module 6 and the servo motor 4. The tip of the triangular dividing block 5 faces the rotation axis 4.1 of the servo motor. The two diameter measuring modules 6 are located on the rear sides of the triangular dividing block 5. During sample preparation, the two halves of the folded enameled wire 17 will be located on the two sides of the triangular dividing block 5, and the two halves of the enameled wire 17 will be separated by the triangular dividing block 5.

[0044] like Figure 2 As shown, the diameter measuring module 6 in this embodiment includes a fixed plate 6.1, a movable plate 6.2, a pressure sensor, an infrared ranging module, and a drive mechanism. The fixed plate 6.1 and the movable plate 6.2 are mounted opposite each other on a fixed base. The movable plate 6.2 can move relative to the fixed plate 6.1, that is, it can move away from or closer to the fixed plate 6.1. The movable plate 6.2 can be moved using a conventional slide rail and slide groove structure. The drive mechanism is connected to the movable plate 6.2 and is used to drive the movable plate 6.2 to move linearly. The drive mechanism adopts a conventional mechanism for driving objects to move linearly, such as a lead screw and nut mechanism. The pressure sensor and the infrared ranging module are respectively mounted on the fixed plate 6.1. The pressure sensor is used to measure the pressure on the fixed plate 6.1, and the infrared ranging module is used to measure the distance between the fixed plate 6.1 and the movable plate 6.2.

[0045] The linear motion mechanism is installed at the other end of the base, such as Figure 3 As shown, the linear motion mechanism includes a transmission wheel set and a transmission belt 11.2. The transmission wheel set includes two transmission wheels 11.1, which are rotatably mounted at opposite ends of the movement path of the enameled wire fixing block 10. The transmission belt 11.2 is mounted on the transmission wheels 11.1. A mounting groove 1.1 is provided on the top of the base 1, and the transmission belt 11.2 protrudes above the mounting groove 1.1 on the base 1. The enameled wire fixing block 10 is located on the top of the base 1, and its bottom is fixedly connected to the transmission belt 11.2. The transmission belt 11.2 can drive the enameled wire fixing block 10 to move together, allowing the enameled wire fixing block 10 to move away from or closer to the rotating shaft 4.1 of the servo motor. The output shaft of the torque motor 16 is connected to the transmission wheels 11.1, and the torque motor 16 drives the transmission wheels 11.1. During sample preparation, the torque motor 16 provides a corresponding torque according to the diameter of the enameled wire 17, so that the enameled wire fixing block 10 can provide a corresponding pulling force to the enameled wire 17 during the twisting process.

[0046] The enameled wire fixing block 10 is provided with a fixing mechanism for fixing the ends 17.2 of the folded enameled wire. In this embodiment, the fixing mechanism includes a rotating column 8 and two baffles 9. The two baffles 9 are fixed relative to each other on the top of the enameled wire fixing block 10. The rotating column 8 is vertically rotatably positioned between the two baffles 9. Cam surfaces 8.1 are provided on the sides of the rotating column 8 corresponding to the two baffles 9. The gap between the cam surfaces 8.1 and the baffles 9 can be adjusted by rotating the rotating column 8. The two ends 17.2 of the folded enameled wire 17 are placed between the rotating column 8 and the baffles 9, and then the ends 17.2 of the enameled wire are fixed between the cam surfaces 8 and the baffles 9 by rotating the rotating column 8.

[0047] A flat groove 10.1 is provided on the side of the enameled wire fixing block 10. The inner end of the flat groove 10.1 extends into the interior of the enameled wire fixing block 10. The lower end of the rotating column 8 is located at the inner end of the flat groove 10.1. A lever 12 is provided in the flat groove 10.1. One end of the lever 12 is fixedly connected to the lower end of the rotating column 8, and the other end of the lever 12 extends out of the flat groove 10.1. By moving the lever 12, the rotating column 8 can be rotated. The operation is convenient and quick, thereby enabling rapid fixing of the end 17.2 of the enameled wire. Figure 4 The diagram on the left shows how moving the lever 12 causes the rotating column 8 to rotate, thus reducing the gap between the cam surface 8.1 and the baffle 9. Figure 4 The diagram on the right shows a schematic diagram of how the lever 12 drives the rotating column 8 to rotate, thereby increasing the gap between the cam surface 8.1 and the baffle 9.

[0048] The process of using the sample preparation machine that twists the internal enameled wire in this embodiment is as follows:

[0049] During sample preparation, such as Figure 6 As shown, the enameled wire 17 is folded in half, and the circle 17.1 formed at one end of the folded enameled wire 17 is fitted onto the groove 4.2 on the rotating shaft 4.1 of the servo motor. The folded enameled wire 17 passes through both sides of the triangular dividing block 5 and passes between the fixed plate 6.1 and the movable plate 6.2 of the diameter measuring module 6. The end 17.2 of the enameled wire is placed between the rotating column 8 and the baffle 9. Then, the lever 12 is turned so that the rotating column 8 rotates and clamps the end 17.2 of the enameled wire, thus completing the fixation of the enameled wire 17.

[0050] Then the sample preparation machine is started. The drive mechanism of the diameter measurement module 6 drives the movable plate 6.2 to move towards the fixed plate 6.1 until the pressure sensor measures the set pressure and stops moving. At this time, the infrared ranging module measures the distance between the fixed plate 6.1 and the movable plate 6.2, and obtains the diameter of the two halves of the folded enameled wire 17. The average of the diameters measured by the two diameter measurement modules is taken as the final diameter of the enameled wire. After the measurement is completed, the movable plate automatically resets.

[0051] Then, the controller of the sample preparation machine obtains the corresponding number of twists and load based on the diameter of the enameled wire (the controller of the sample preparation machine stores the corresponding data between the diameter of the enameled wire, the number of twists, and the load; the corresponding number of twists and load can be directly found based on the diameter of the enameled wire; the load is the tension of the enameled wire fixing block 10 on the enameled wire 17). Then, the servo motor 4 and the torque motor 16 are started. The servo motor 4 rotates the corresponding number of turns according to the diameter of the enameled wire 17 to twist the enameled wire 17, and the torque motor 16 provides the corresponding torque according to the diameter of the enameled wire, so that the enameled wire fixing block 10 can provide the corresponding tension to the twisted enameled wire 17, and finally the twisting is completed. After the twisting is completed, the lever 12 is moved to loosen the two ends of the folded enameled wire 17, and then the twisted enameled wire can be taken out.

[0052] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention. The implementation of the present invention is not limited thereto. All other modifications, substitutions or alterations made to the above structure of the present invention based on the above content of the present invention, in accordance with ordinary technical knowledge and common practice in the field, without departing from the basic technical idea of ​​the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A sample preparation machine for twisting internal enameled wires in compatibility testing, characterized in that: The device includes a base, a servo motor, a diameter measuring module, a torque motor, a linear motion mechanism, and an enameled wire fixing block. The servo motor is mounted at one end of the base, and its rotation shaft extends laterally with a hook structure for catching the folded enameled wire. The diameter measuring module is mounted in the middle of the base, and the linear motion mechanism is mounted at the other end. The enameled wire fixing block is mounted on the linear motion mechanism and located above the base. The linear motion mechanism moves the enameled wire fixing block away from or towards the servo motor. The enameled wire fixing block has a fixing mechanism for securing the two ends of the folded enameled wire. The torque motor is connected to the linear motion mechanism. During sample preparation, the diameter of the enameled wire is measured by the diameter measuring module. The servo motor rotates a corresponding number of turns according to the diameter of the enameled wire to twist it. The torque motor provides a corresponding torque according to the diameter of the enameled wire, so that the enameled wire fixing block can provide a corresponding pulling force to the enameled wire during the twisting process.

2. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 1, characterized in that: The fixing mechanism includes a rotating column and two baffles. The two baffles are fixed relative to each other on the top of the enameled wire fixing block. The rotating column is vertically rotatably disposed between the two baffles. The rotating column has cam surfaces on the sides corresponding to the two baffles. By rotating the rotating column, the gap between the cam surfaces and the baffles can be adjusted. The gap between the cam surfaces and the baffles is used to clamp the end of the enameled wire.

3. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 2, characterized in that: A lever is connected to the rotating column, and the rotating column can be rotated by moving the lever.

4. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 3, characterized in that: The enameled wire fixing block has a flat groove on its side, the inner end of which extends into the interior of the enameled wire fixing block. The lower end of the rotating column is located at the inner end of the flat groove. The lever is located in the flat groove, one end of which is fixedly connected to the lower end of the rotating column, and the other end of which extends out of the flat groove.

5. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 1, characterized in that: The base has two diameter measuring modules in the middle, which are used to measure the diameter of the two halves of the folded enameled wire. The base also has a triangular dividing block in the middle, which is located between the diameter measuring modules and the servo motor, with the tip of the triangular dividing block facing the rotation axis of the servo motor.

6. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 1, characterized in that: The diameter measurement module includes a fixed plate, a movable plate, a pressure sensor, an infrared ranging module, and a drive mechanism. A fixed base is provided in the middle of the base. The fixed plate and the movable plate are mounted opposite each other on the fixed base. The movable plate can move relative to the fixed plate. The drive mechanism is used to drive the movable plate to move linearly. The pressure sensor and the infrared ranging module are respectively located on the fixed plate. The pressure sensor is used to measure the pressure on the fixed plate, and the infrared ranging module is used to measure the distance between the fixed plate and the movable plate.

7. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 1, characterized in that: The linear motion mechanism includes a transmission wheel set and a transmission belt. The transmission wheel set is disposed inside the base, and the transmission belt is mounted on the transmission wheel set and protrudes above the base. The lower part of the enameled wire fixing block is fixedly connected to the transmission belt, and the output shaft of the torque motor is connected to the transmission wheel set.

8. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 1, characterized in that: The base is provided with a motor mounting bracket, the servo motor is installed in the motor mounting bracket, and the motor mounting bracket is provided with a display for displaying the number of rotations of the servo motor and the diameter measured by the diameter measurement module.

9. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 8, characterized in that: The side of the motor mounting base is equipped with a motor start button, a motor stop button, and a motor reset button for controlling the servo motor.

10. The sample preparation machine for twisting internal enameled wires in compatibility testing according to claim 1, characterized in that: The hook structure includes a groove provided on the side wall of the rotating shaft of the servo motor.

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