Structure and method for testing pressure between iron core sheets

Abstract

The invention discloses a structure and method for testing the pressure between iron core sheets, the structure for testing the pressure between the iron core sheets comprises a pressure applying assembly, a plurality of measuring modules and two punching sheets, the axial outer side of each punching sheet is provided with the pressure applying assembly, and the plurality of measuring modules are respectively arranged between the two punching sheets; the measuring module comprises an upper mounting plate, a lower mounting plate and a pressure sensor, the upper mounting plate and the lower mounting plate are respectively abutted against one punching sheet, and the pressure sensor is fixed between the upper mounting plate and the lower mounting plate. According to the structure, the plurality of measuring modules are arranged between the two punching sheets, namely, the pressure sensors are arranged between the upper mounting plate and the lower mounting plate, so that the pressure state of each position between the punching sheets in the whole laminating process can be measured, the measuring result is not influenced by buckling deformation of an applying assembly, the measuring error is small, and the result is accurate and reliable. After the rib plates are welded on the peripheral sides of the punching sheets, the pressure sensors can also measure the pressure value between the punching sheets, and the multiple pressure sensors can measure the pressure distribution between the welded punching sheets.

Description

Technical Field

[0001] The present application relates to the technical field of monitoring the core stacking of traction motors, and in particular to a structure and a testing method for testing the pressure between core sheets. Background Art

[0002] With the rapid development of rail transit, higher requirements are placed on the reliability of traction motors. The motor core is one of the important components of the motor, and the core lamination process is a key process in the motor manufacturing process. The lamination quality has a great impact on the safe operation of the motor.

[0003] At present, the pressure test between core sheets is as follows: fix the dial gauge on the workbench of the press machine, with the pointer close to the pressure ring; use the press machine to gradually apply pressure to the laminated core, record the reading of the dial gauge under different lamination pressures (representing the compression of the core), and draw a lamination pressure-core compression relationship curve. Measure the residual compression of the core after the shaft is shrunk or the rib plate is welded, and then calculate the pressure value between the core sheets based on the lamination pressure-core compression relationship curve.

[0004] In the above-mentioned method for testing the pressure between the core sheets, the warping deformation of the pressing ring during the lamination process will introduce a large measurement error; and the distribution of the pressure between the core sheets cannot be measured. Summary of the invention

[0005] The present invention provides a structure and a method for testing the pressure between core sheets, so as to solve the technical problems in the prior art that the pressure measurement error between core sheets is large and the pressure distribution between core sheets cannot be measured.

[0006] To achieve the above object, the technical solution provided by the present invention is as follows: According to a first aspect of the present invention, a structure for testing pressure between core sheets is provided, comprising a pressure-applying assembly, a plurality of measuring modules and two punching sheets, wherein the pressure-applying assembly is arranged on the axial outer side of each punching sheet, and the plurality of measuring modules are respectively arranged between the two punching sheets; the measuring module comprises an upper mounting plate, a lower mounting plate and a pressure sensor, the upper mounting plate and the lower mounting plate are respectively abutted against one of the punching sheets, and the pressure sensor is fixed between the upper mounting plate and the lower mounting plate.

[0007] Furthermore, the plurality of measuring modules are evenly arranged between the two punching sheets.

[0008] Furthermore, the plurality of measuring modules are arranged in a ring shape between the two punching sheets, and the arrangement area includes an inner ring area, a middle ring area and an outer ring area. The inner ring area, the middle ring area and the outer ring area are respectively divided into a plurality of sector-shaped areas, and a measuring module is set in each sector-shaped area.

[0009] Furthermore, the inner ring area, the middle ring area, and the outer ring area are evenly divided into 8 to 16 sector-shaped areas respectively.

[0010] Furthermore, the pressure-applying assembly includes a hydraulic press and a template, and the structure for pressure testing between core sheets also includes a tooth pressure plate and a pressure ring. The tooth pressure plate, the pressure ring and the template are sequentially arranged on both axial sides of the punching sheet, and the hydraulic press applies pressure to the template above; the junction between the inner ring area and the middle ring area is located at the inner circle boundary of the pressure ring.

[0011] Furthermore, the measurement module also includes a digital transmitter, the structure for testing the pressure between core sheets also includes a data collector, each of the pressure sensors is electrically connected to one of the digital transmitters, and the digital transmitters are all electrically connected to the data collector.

[0012] The second aspect of the present invention provides a method for testing the pressure between core sheets, which is applied to the above-mentioned structure for testing the pressure between core sheets, and includes the following steps: stacking the pressure-applying assembly, the punching sheet and a plurality of the measuring modules, applying pressure to the punching sheet, and the pressure sensor measuring the pressure value at each position between the punching sheets in real time; removing the pressure so that the stacking pressure is retained between the punching sheets, and welding a rib plate on the circumferential side of the punching sheet, and the pressure sensor measuring the pressure value at each position between the punching sheets after the rib plate is welded.

[0013] Furthermore, the step also includes separating the pressure-applying assembly from the core after welding the rib plate, so that the measured value of the pressure sensor is 2 to 3 MPa after separation.

[0014] The structure for testing the pressure between core sheets provided by the present invention has multiple measuring modules arranged between two punching sheets, and the measuring modules include an upper mounting plate and a lower mounting plate respectively abutting against the punching sheets, and a pressure sensor is arranged between the upper mounting plate and the lower mounting plate, so as to measure the pressure state between the punching sheets during the entire stacking process, with small measurement error and accurate and reliable results; in addition, after the rib plates are welded on the sides of the punching sheets, the pressure sensor can also measure the pressure value between the punching sheets, and multiple pressure sensors can measure the pressure distribution between the punching sheets after welding; after the template is separated from the core in the demolding process, the pressure between the core punching sheets can be measured to ensure that the pressure between the core sheets meets the requirements of the stacking quality and ensure the safe operation of the traction motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a structure for testing the pressure between core sheets in an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the pressure sensor arrangement area.

[0017] Reference numerals: 10. Punch the film; 21. Upper mounting plate; 22. Lower mounting plate; 23. Pressure sensor; 23a, inner ring area; 23b, middle ring area; 23c, outer ring area; 31. Pressure ring; 32. Tooth pressure plate. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0023] like Figure 1 As shown, a first aspect of an embodiment of the present application provides a structure for pressure testing between core sheets, including a pressure assembly, a plurality of measuring modules and two punching sheets 10, wherein the plurality of measuring modules are arranged between the two punching sheets 10, and a pressure assembly is arranged on the axial outer side of each punching sheet 10; the measuring module includes an upper mounting plate 21, a lower mounting plate 22 and a pressure sensor 23, the upper mounting plate 21 and the lower mounting plate 22 are respectively abutted against a punching sheet 10, and the pressure sensor 23 is fixed between the upper mounting plate 21 and the lower mounting plate 22.

[0024] In the present application, refer to Figure 1 The upper mounting plate 21 abuts against the punching sheet 10 above the core, and the lower mounting plate 22 abuts against the punching sheet 10 below the core. The pressure sensor 23 is fixed between the upper mounting plate 21 and the lower mounting plate 22. The upper mounting plate 21, the pressure sensor 23 and the lower mounting plate 22 can be a split structure or an integral structure. A pressure component is provided on the axial outer side of the punching sheet 10, that is, above the punching sheet 10 above the core and below the punching sheet 10 below the core.

[0025] The structure for testing the pressure between the core sheets of the embodiment of the present application is provided with a plurality of measuring modules between the two punching sheets 10, and the measuring modules include an upper mounting plate 21 and a lower mounting plate 22 respectively abutting against the punching sheets 10, and a pressure sensor 23 is provided between the upper mounting plate 21 and the lower mounting plate 22, so as to measure the pressure state between the punching sheets 10 during the entire stacking process, with a small measurement error and accurate and reliable results; in addition, after the rib plates are welded on the peripheral sides of the punching sheets 10, the pressure sensors 23 can also measure the pressure values ​​between the punching sheets 10, and the plurality of pressure sensors 23 can measure the pressure distribution between the punching sheets 10 after welding; after the template is separated from the core in the demolding process, the pressure between the core punching sheets 10 can be measured to ensure that the pressure between the core sheets meets the requirements of the stacking quality and to ensure the safe operation of the traction motor.

[0026] In some embodiments, a plurality of measurement modules are evenly arranged between two punching sheets 10. It can be understood that the evenly arranged plurality of pressure sensors 23 can simultaneously measure the inter-sheet pressure of each region between the punching sheets 10, and provide more accurate inter-sheet pressure distribution.

[0027] In other embodiments, multiple measurement modules are arranged in a ring shape between two punching sheets 10, and the arrangement area includes an inner ring area 23a, a middle ring area 23b and an outer ring area 23c. The inner ring area 23a, the middle ring area 23b, and the outer ring area 23c are respectively divided into multiple sector-shaped areas, and a measurement module is set in each sector-shaped area.

[0028] In the present application, refer to Figure 2 , the area between the two punching sheets 10 is divided into an annular area, which is in a horizontal plane, perpendicular to the axial direction of the punching sheet and is divided into an inner annular area 23a, a middle annular area 23b and an outer annular area 23c from the inside to the outside. Measuring modules are installed in the above-mentioned areas respectively, and the inter-sheet pressure at different positions in the radial direction can be measured to analyze the distribution of the pressure in the radial direction; each of the above-mentioned areas is divided into a plurality of sector-shaped areas, and a measuring module is installed in each sector-shaped area, so that the inter-sheet pressure at different positions in the same radial direction can be measured, which can be used to analyze the distribution of the inter-sheet pressure in the same radial direction.

[0029] By setting the arrangement area of ​​the measurement module, the measurement result of the inter-sheet pressure can be free from the influence of the warping deformation of the pressure component, and the measurement error can be reduced. In addition, the pressure sensor 23 can measure the inter-sheet pressure in real time, and the measurement process is simple, the result is intuitive, and the efficiency is high.

[0030] Furthermore, the inner ring area 23a, the middle ring area 23b, and the outer ring area 23c are evenly divided into 8 to 16 fan-shaped areas. It can be understood that too few fan-shaped areas will affect the judgment of the pressure distribution between the sheets in the same radial direction, and the 8 fan-shaped areas include 8 different radial measurement results. If there are too many fan-shaped areas, the measurement modules will affect each other due to the limited area, resulting in inaccurate test results.

[0031] In some embodiments, the pressure-applying assembly includes a hydraulic press and a template, and the structure for pressure testing between core sheets also includes a pressure ring 31 and a tooth pressure plate 32. The tooth pressure plate 32, the pressure ring 31 and the template are sequentially arranged on both axial sides of the punching sheet 10, and the hydraulic press applies pressure on the upper template; the junction between the inner ring area 23a and the middle ring area 23b is located at the inner circle boundary of the pressure ring 31.

[0032] Reference Figure 1In the axial direction of the punching sheet 10, the template (not shown in the figure), the pressing ring 31, the tooth pressure plate 32, the punching sheet 10, the measuring module, the punching sheet 10, the tooth pressure plate 32, the pressing ring 31, and the template are stacked in sequence from bottom to top. An oil hydraulic press is placed on the template located above, and oil pressure is applied through the upper template. The pressure sensor 23 can measure the inter-sheet pressure under different stacking parameters. In addition, the inner ring area 23a and the middle ring area 23b are separated by the inner circle of the pressing ring 31, wherein the pressure sensor 23 of the inner ring area 23a mainly measures the inter-sheet pressure of the tooth part of the punching sheet 10, and the middle ring area 23b and the outer ring area 23c are the yoke parts. The pressure sensors 23 of the above two areas are used to measure the inter-sheet pressure of the yoke part of the punching sheet 10. Each annular area is divided into 8 to 16 sector areas, and the inter-sheet pressure of each sector area can be measured separately.

[0033] In some embodiments, the measurement module further includes a digital transmitter, and the structure for testing the pressure between core sheets further includes a data collector. Each pressure sensor 23 is electrically connected to a digital transmitter, and the digital transmitters are electrically connected to the data collector. In the embodiment of the present application, a digital transmitter is configured in each sector area where the pressure sensor 23 is located, and the number of digital transmitters is the same as the number of pressure sensors 23. The above-mentioned multiple digital transmitters are then electrically connected to the data collector, and the data collector transmits the collected data to a signal receiving end, such as a mobile phone or a computer, to realize real-time display of the pressure between sheets and record the load at the same time.

[0034] A second aspect of the embodiment of the present application provides a method for testing the pressure between core sheets, which is applied to the above-mentioned structure for testing the pressure between core sheets, and includes the following steps: The stacking pressure component, the punching sheet 10 and multiple measuring modules apply pressure to the punching sheet 10, and the pressure sensor 23 measures the pressure value at each position between the punching sheets 10 in real time; the pressure is released to retain the stacking pressure between the punching sheets 10, and the ribs are welded on the surrounding sides of the punching sheets 10. The pressure sensor 23 measures the pressure value at each position between the punching sheets 10 after the ribs are welded.

[0035] The test method for the pressure between the core sheets in the embodiment of the present application can measure the data and distribution of the pressure between the sheets under different stacking parameters in real time, can also measure the pressure distribution between the sheets after the ribs are welded on the side of the punching sheet 10, and can also measure the final pressure between the sheets after the template is separated from the core. The above test method can provide a basis for the matching of the process parameters of stacking and welding with the frame structure, and provide an optimization direction for the misalignment of the punching sheet 10, convex sheets, etc. caused by the abnormally large pressure between the sheets in the outer ring area 23c caused by welding shrinkage.

[0036] Furthermore, the above steps also include separating the pressure assembly from the core after welding the rib plate, and making the measured value of the pressure sensor 23 be 2-3 MPa after separation. After the template is separated from the core, the measured value of the pressure sensor 23 needs to be maintained within the above pressure range to meet the requirements of the core lamination process, thereby ensuring the lamination quality of the core in the traction motor and the safe operation of the traction motor.

[0037] In the embodiment of the present application, the area S of the punching sheet 10 corresponding to the inner ring area 23a is N , the middle ring area 23b corresponds to the area S of the punching sheet 10 Z , the outer ring area 23c corresponds to the area S of the punching sheet 10 W The average pressure of the lamination process is P. The welding shrinkage increases the average pressure to 2 to 4 times the original pressure. The nominal range of the sensor is S. W * (2~4) P / 16, safe overload 1.2MPa, ultimate overload 2.2MPa.

[0038] Through the above-mentioned test method of the pressure between the core sheets, it is possible to determine the pressure that the hydraulic press needs to apply when the requirements of the core stacking process are met, thereby fixing various parameters of the stacking process, making the core stacking process more reliable and ensuring the stacking quality.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A structure for testing pressure between core sheets, characterized in that: It includes a pressure component, a plurality of measuring modules and two punching sheets, wherein the pressure component is arranged on the axial outer side of each punching sheet, and the plurality of measuring modules are respectively arranged between the two punching sheets; the measuring module includes an upper mounting plate, a lower mounting plate and a pressure sensor, the upper mounting plate and the lower mounting plate are respectively abutted against one of the punching sheets, and the pressure sensor is fixed between the upper mounting plate and the lower mounting plate.

2. The structure for testing the pressure between core sheets according to claim 1, characterized in that: The plurality of measuring modules are evenly arranged between the two punching sheets.

3. The structure for testing the pressure between core sheets according to claim 1, characterized in that: The multiple measuring modules are arranged in a ring shape between the two punching sheets, and the arrangement area includes an inner ring area, a middle ring area and an outer ring area. The inner ring area, the middle ring area and the outer ring area are respectively divided into multiple sector-shaped areas, and a measuring module is set in each sector-shaped area.

4. The structure for testing the pressure between core sheets according to claim 3, characterized in that: The inner ring area, the middle ring area, and the outer ring area are evenly divided into 8 to 16 sector-shaped areas respectively.

5. The structure for testing the pressure between core sheets according to claim 3, characterized in that: The pressure-applying assembly includes a hydraulic press and a template, and the structure for pressure testing between core sheets also includes a tooth pressure plate and a pressure ring. The tooth pressure plate, the pressure ring and the template are sequentially arranged on both axial sides of the punching sheet, and the hydraulic press applies pressure to the template above; the junction between the inner ring area and the middle ring area is located at the inner circle boundary of the pressure ring.

6. The structure for testing the pressure between core sheets according to any one of claims 1 to 5, characterized in that: The measuring module further includes a digital transmitter, and the structure for testing the pressure between the core sheets further includes a data collector. Each of the pressure sensors is electrically connected to one of the digital transmitters, and the digital transmitters are all electrically connected to the data collector.

7. A method for testing the pressure between core sheets, applied to the structure for testing the pressure between core sheets according to any one of claims 1 to 6, characterized in that: The following steps are involved: The pressure-applying assembly, the punching sheet and the plurality of the measuring modules are stacked to apply pressure to the punching sheet, and the pressure sensor measures the pressure value at each position between the punching sheets in real time; The pressure is released to keep the stacking pressure between the punching sheets, and a rib plate is welded on the peripheral side of the punching sheet. The pressure sensor measures the pressure value at each position between the punching sheets after the rib plate is welded.

8. The method for testing the pressure between core sheets according to claim 7, characterized in that: The step also includes separating the pressure-applying assembly from the iron core after welding the rib plate, so that the measured value of the pressure sensor is 2 to 3 MPa after separation.

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