Rotor magnetic steel press-out force double-end testing mechanism

Abstract

The invention relates to a rotor magnetic steel press-out force double-end test mechanism, which comprises a fixed frame, a servo press, a balance assembly and two groups of independent press head structures, the balance assembly comprises a first balance plate body and a first transition connecting piece, a first clamping groove is formed in the top end of the middle of the first balance plate body, a first clamping head is arranged at the front end of the first transition connecting piece, the front end of the first clamping head is of a spherical structure, and the depth of the first clamping groove is larger than the thickness of the first clamping head. The two pressing head structures are oppositely arranged at the lower ends of the two sides of the first balance plate body. The servo press is used, the displacement stroke can be more accurately guaranteed, a controller matched with the servo press and a pressure sensor are subjected to interlocking control, and pressure and displacement are regulated in a stepless mode; the original balance assembly is provided with an independent pressure sensor and a double-pressure-head structure, the efficiency is improved by two times, and when the heights of the two pieces of magnetic steel are different, the pressure heads can make up the height difference of the magnetic steel through the balance assembly, and it is ensured that the two pieces of magnetic steel can be stressed at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of automatic assembly of small brushless motors, and in particular to a rotor magnetic steel press-off force double-head testing mechanism. Background Art

[0002] After the magnet is put into the rotor, in order to ensure the stability of the magnet, the magnet will be bonded to the rotor core or rotor casing by applying magnetic glue, and then the glue will be cured by high-frequency heating to firmly bond the magnet to the rotor; the stability of the magnet will affect the speed, noise and performance of the finished motor, so the bonding strength between the magnet and the rotor is particularly important. In order to ensure the bonding strength, the magnet on the rotor is generally subjected to thrust testing to test the magnet's press-off force. The magnetic press-off force refers to the external force required for the magnet to fall off from its fixed position or structure under specific conditions. Because there is generally a height difference of ±0.5mm when the magnet is installed, if the magnet press-off force test mechanism adopts a double pressure head structure, it will face an unavoidable problem, that is, one of the pressure heads contacts the higher magnet. When the servo press continues to press down, unless the higher magnet is pressed off and produces a downward displacement, the other pressure head cannot touch the lower magnet. Therefore, traditional rotor magnet press-off force test mechanisms generally use cylinders and pressure sensors or electric cylinders, grating scales and pressure sensors, and are basically controlled by a single pressure head independently, with low test efficiency and low accuracy.

[0003] Therefore, in view of the shortcomings of the existing technology, it is necessary to design a rotor magnetic steel press-off force double-head testing mechanism to solve the above problems.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solution of the present invention and facilitating the understanding of those skilled in the art. It cannot be considered that the above contents are well known to those skilled in the art simply because they are explained in the background technology of the present invention. Summary of the invention

[0005] In order to overcome the deficiencies in the above-mentioned prior art, the purpose of the present invention is to disclose a double-headed test mechanism for the press-out force of a rotor magnetic steel, which is used to solve the problem that the press-out force test of two pieces of magnetic steel cannot be performed simultaneously due to the height difference of the magnetic steel installation, and the problem that the traditional rotor magnetic steel press-out force test mechanism has poor testing accuracy.

[0006] The present invention discloses a rotor magnetic steel press-off force double-head testing mechanism, comprising a fixed frame, a servo press, a balancing assembly and two groups of independent pressure head structures, wherein the servo press is arranged on the fixed frame. The balancing assembly comprises a first balancing plate body and a first transition connector, wherein a first card slot is arranged at the middle top of the first balancing plate body, a first card joint is arranged at the front end of the first transition connector, the front end of the first card joint is a spherical structure, the first card joint is arranged in the first card slot, the depth of the first card slot is slightly greater than the thickness of the first card joint, so that the first balancing plate body can swing up and down slightly after being assembled with the first transition connector; the rear end of the first transition connector is connected to the output end of the servo press, and two groups of pressure head structures are relatively arranged at the lower ends of both sides of the first balancing plate body, and pressure sensors are arranged on the pressure head structures. When there is a height difference between the magnetic steels corresponding to the two groups of pressure head structures, the balancing assembly will produce a certain tilt floating to compensate for the difference in the installation height of the magnetic steels, so that the thrust generated by the two groups of pressure head structures is consistent.

[0007] Preferred technical solution: The pressure head structure also includes a second balance plate body and a second transition connector, a second slot is provided at the middle top of the second balance plate body, a second connector is provided at the front end of the second transition connector, the front end of the second connector is a spherical structure, the second connector is arranged in the second slot, the depth of the second slot is slightly greater than the thickness of the second connector, the rear end of the second transition connector is fixed to the lower end of the first balance plate body, the pressure sensor is fixed to the lower end of the second balance plate body, and a pressure head is provided below the output end of the pressure sensor. The posture of the pressure head structure is always kept slightly floating vertically downward by the second balance plate body and the second transition connector, so as to ensure the consistency of the force direction of the magnetic steel, and thus ensure the accuracy of the magnetic steel pressure-release test.

[0008] The preferred technical solution: the upper end of the pressure head is connected to a floating plate, a guide column is provided on the floating plate, a linear bearing is provided on the second balance plate body at a position corresponding to the guide column, the outer periphery of the guide column is slidably connected to the linear bearing, and the floating plate can be completely separated from the output end of the pressure sensor when it moves downward to the maximum distance. This floating structure acts as a buffer when the pressure head contacts the magnetic steel, and also ensures that the pressure sensor is in a zero pre-pressure state when not working.

[0009] Preferred technical solution: First guide cut surfaces are provided on both sides of the first transition connector, and a first limit guide plate slidably connected to the first guide cut surface is provided on the first balance plate body, and the setting direction of the first limit guide plate is consistent with the arrangement direction of the two groups of pressure heads, so that the inclination direction of the first balance plate body is always consistent with the arrangement direction of the two groups of pressure head structures.

[0010] Preferred technical solution: second guide sections are provided on both sides of the second transition connector, and a second limiting guide plate slidably connected to the second guide section is provided on the second balance plate body, and the setting direction of the second limiting guide plate is consistent with the setting direction of the first limiting guide plate.

[0011] Preferred technical solution: The first card slot and the second card slot are U-shaped opening slots, which are convenient for disassembly and assembly with the transition connector.

[0012] Preferred technical solution: The pressure sensor is a weighing sensor with high precision and good stability.

[0013] Preferred technical solution: The servo press and the pressure sensor are interlockedly controlled through a controller, displacement and pressure are fed back to each other, pressure and displacement are steplessly regulated, and the control accuracy of the servo press output is improved.

[0014] Preferred technical solution: The fixing frame is provided with support columns along the output direction of the servo press, which are used to fix the rotor magnetic steel press-off force double-head testing mechanism.

[0015] Preferred technical solution: The height difference compensation range of the balancing component is ±0.5mm.

[0016] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention provides a double-head testing mechanism for the rotor magnetic steel press-off force. The mechanism uses a servo press to more accurately ensure the displacement stroke. The controller and pressure sensor matched with the servo press are interlocked and controlled. The displacement and pressure can be fed back to each other, and the pressure and displacement can be steplessly regulated. The original balancing component is equipped with an independent pressure sensor and a double pressure head structure. Compared with the single pressure head structure commonly used in the industry, the efficiency is doubled. In the case of a double pressure head test, when the heights of the two magnetic steels are different, the pressure head can compensate for the height difference through the balancing component to ensure that the two magnetic steels can be subjected to force at the same time, and can cooperate with the servo press and the pressure sensor to quickly identify the press-off magnetic steel. The separate pressure sensor ensures that the thrust of each magnetic steel can be measured separately without affecting each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a double-head testing mechanism for rotor magnetic steel press-off force of the present invention; Figure 2 It is an exploded view of the balancing assembly and the pressure head structure in the present invention.

[0019] In the above drawings, 1, fixed frame; 11, support column; 2, servo press; 3, balance assembly; 31, first balance plate body; 31a, first slot; 32, first transition connector; 32a, first clamping joint; 32b, first guide section; 32c, first limit guide plate; 4, pressure head structure; 41, pressure sensor; 42, second balance plate body; 42a, second slot; 42b, second limit guide plate; 43, second transition connector; 43a, second clamping joint; 43b, second guide section; 44, pressure head; 45, floating plate; 46, guide column; 47, linear bearing. DETAILED DESCRIPTION

[0020] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application are described here. In addition, the terms "including" and "having" and their synonyms are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0022] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0023] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the terms "install", "set", "provided with", "connect", "connected", "sleeved", and "fitted" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For another example, "fitted" can be completely close or partially close. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Example: like Figure 1 As shown, the present invention discloses a rotor magnetic steel press-off force double-head testing mechanism, including a fixing frame 1, a servo press 2, a balancing assembly 3 and two sets of independent press head structures 4. The main components of the present invention are described in detail below: Figure 1 and Figure 2 As shown, the fixing frame 1 is provided with four supporting columns 11 along the output direction of the servo press 2, which are used to place and fix the rotor magnetic steel press-off force double-head testing mechanism and provide space for the lifting and lowering of the press head structure 4.

[0027] like Figure 1 and Figure 2 As shown, the servo press 2 is arranged on a fixed frame 1 to provide power for the lifting and lowering of a balancing assembly 3 and two sets of independent pressing head structures 4.

[0028] like Figure 1 and Figure 2 As shown, the balancing assembly 3 includes a first balancing plate body 31 and a first transition connector 32. A first slot 31a is provided at the top of the middle portion of the first balancing plate body 31. A first clamping joint 32a is provided at the front end of the first transition connector 32. The front end of the first clamping joint 32a is a spherical structure. The first clamping joint 32a is arranged in the first slot 31a. The depth of the first slot 31a is slightly greater than the thickness of the first clamping joint 32a. The rear end of the first transition connector 32 is connected to the output end of the servo press 2. After the first balancing plate body 31 and the first transition connector 32 are connected, they can be slightly tilted and floated, so that the two groups of pressure head structures 4 connected at their lower ends can maintain the same output pressure from the servo press 2 within the floating range of the first balancing plate body 31.

[0029] like Figure 1 and Figure 2As shown, two groups of pressure head structures 4 are relatively arranged at the lower ends of both sides of the first balance plate body 31, and a pressure sensor 41 is arranged on the pressure head structure 4. The pressure head structure 4 also includes a second balance plate body 42 and a second transition connector 43. A second slot 42a is arranged at the middle top of the second balance plate body 42, and a second clamping joint 43a is arranged at the front end of the second transition connector 43. The front end of the second clamping joint 43a is a spherical structure, and the second clamping joint 43a is arranged in the second slot 42a. The depth of the second slot 42a is slightly greater than the thickness of the second clamping joint 43a, and the rear end of the second transition connector 43 is fixed to the lower end of the first balance plate body 31. After the second balance plate body 42 and the second transition connector 43 are connected, they can also be slightly tilted and floated to offset the influence of the tilt of the balance assembly 3, so that the pressure head structure 4 maintains a vertical posture, ensures the consistency of the force direction of the magnetic steel, and further ensures the accuracy of the magnetic steel pressure-release test.

[0030] like Figure 1 and Figure 2 As shown, in order to fix the pressure sensor 41 at the lower end of the second balance plate body 42, a pressure head 44 is provided below the output end of the pressure sensor 41, a floating plate 45 is connected to the upper end of the pressure head 44, a guide column 46 is provided on the floating plate 45, a linear bearing 47 is provided at a position corresponding to the guide column 46 on the second balance plate body 42, the outer periphery of the guide column 46 is slidably connected to the linear bearing 47, and the floating plate 45 can be completely separated from the output end of the pressure sensor 41 when it moves downward to the maximum distance. The floating structure composed of the floating plate 45, the guide column 46 and the linear bearing 47 acts as a buffer when the pressure head 44 contacts the magnetic steel, and also ensures that the pressure sensor 41 is in a zero pre-pressure state reference when it is not working. Figure 1 and Figure 2As shown, the use method and principle of the present invention are as follows: when the magnetic steel is subjected to a press-off force test, the support column 11 is adjusted so that the two groups of pressure head structures 4 correspond to the two groups of magnetic steel to be tested respectively; the servo press 2 is started to drive the balance component 3 and the pressure head structure 4 to move toward the magnetic steel, the pressure head 44 first contacts the magnetic steel, and the floating structure composed of the floating plate 45, the guide column 46 and the linear bearing 47 buffers the contact force, thereby reducing the collision impact of the pressure head 44 on the magnetic steel; then the pressure is continued to be pressed down, so that the floating plate 45 contacts the output end of the pressure sensor 41 and squeezes it until its reading reaches the specified value; in this process, if there is a height difference between the two groups of magnetic steel, due to the two balance components composed of the first balance plate body 31 and the first transition connector 32, The end force arms are the same, and both sides of the first balance plate body 31 will be tilted under the push of the two groups of pressure head structures 4, so that the forces between the two groups of pressure head structures 4 and the magnetic steel are balanced with each other, thereby compensating for the influence of the height difference of the magnetic steel on the pressure-off force test; at the same time, the pressure head structure 4 is flexibly connected to the first balance plate body 31 through a floating structure composed of a second balance plate body 42 and a second transition connector 43, which can reduce the influence of the inclination of the first balance plate body 31 on the posture of the pressure head structure 4, so that the pressure direction of the pressure head 4 on the magnetic steel remains vertical, thereby improving the accuracy of the test; if the magnetic steel is loosened and displaced during the test, it can be automatically determined directly by comparing the output displacement of the servo press 2 with the value of the pressure sensor 41.

[0031] like Figure 1 and Figure 2 As shown, in order to ensure the docking accuracy between the pressure head structure 4 and the magnetic steel, first guide cut surfaces 32b are provided on both sides of the first transition connector 32, and a first limiting guide plate 32c slidably connected to the first guide cut surface 32b is provided on the first balance plate body 31. The setting direction of the first limiting guide plate 32c is consistent with the arrangement direction of the two groups of pressure heads 44, so that the first balance plate body 31 can only be tilted along the arrangement direction of the two groups of pressure heads 44, thereby reducing the difficulty of docking between the pressure head 44 on the pressure head structure 4 and the magnetic steel.

[0032] like Figure 1 and Figure 2 As shown, in order to further ensure the consistency of the force direction of the magnetic steel, second guide cut surfaces 43b are provided on both sides of the second transition connector 43, and a second limiting guide plate 42b slidingly connected to the second guide cut surface 43b is provided on the second balance plate body 42. The setting direction of the second limiting guide plate 42b is consistent with the setting direction of the first limiting guide plate 32c, so as to keep the pressure head structure 4 in a vertical upward posture.

[0033] like Figure 1 and Figure 2As shown, in order to facilitate disassembly, assembly and adjustment of the pressure head structure 4, the first card slot 31a and the second card slot 42a are U-shaped opening slots, and the first card connector 32a and the second card connector 43a can be quickly disassembled and assembled from the openings of the U-shaped opening slots.

[0034] like Figure 1 and Figure 2 As shown, in order to improve the test accuracy, the pressure sensor 41 adopts a weighing sensor.

[0035] like Figure 1 and Figure 2 As shown, in order to improve the detection efficiency, the servo press 2 and the pressure sensor 41 are interlockedly controlled through a controller, and whether the magnetic steel is properly fitted is automatically determined by the downward pressing distance and the vertical change of the sensor.

[0036] like Figure 1 and Figure 2 As shown, in order to achieve accurate judgment on the detection of magnetic steel, the height difference compensation range of the balancing component is ±0.5mm, and when the magnetic steel is loosened by 0.1mm, it can be automatically sensed through the displacement of the servo press and the corresponding reading of the pressure sensor 41, and then the output of the servo press is stopped, so that the displacement of the pressed-off magnetic steel after being pressed off can be compensated by the tilting of the balancing component before being detected and confirmed, and it will not affect the magnetic steel on the other side, thereby achieving rapid confirmation of the pressed-off magnetic steel.

[0037] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor magnetic steel press-off force double-head testing mechanism, comprising a fixed frame (1), a servo press (2), a balancing assembly (3) and two sets of independent press head structures (4), wherein the servo press (2) is arranged on the fixed frame (1), and is characterized in that: The balancing assembly (3) comprises a first balancing plate body (31) and a first transition connector (32); a first slot (31a) is provided at the top of the middle portion of the first balancing plate body (31); a first clamping joint (32a) is provided at the front end of the first transition connector (32); the front end of the first clamping joint (32a) is a spherical structure; the first clamping joint (32a) is arranged in the first slot (31a); a gap is left between the first slot (31a) and the first clamping joint (32a); the rear end of the first transition connector (32) is connected to the output end of the servo press (2); two groups of the pressure head structures (4) are relatively arranged at the lower ends of both sides of the first balancing plate body (31); and a pressure sensor (41) is provided on the pressure head structure (4).

2. A rotor magnetic steel press-off force double-head testing mechanism according to claim 1, characterized in that: The pressure head structure (4) further comprises a second balancing plate body (42) and a second transition connector (43); a second slot (42a) is provided at the top of the middle portion of the second balancing plate body (42); a second clamping joint (43a) is provided at the front end of the second transition connector (43); the front end of the second clamping joint (43a) is a spherical structure; the second clamping joint (43a) is arranged in the second slot (42a); a gap is left between the second slot (42a) and the second clamping joint (43a); the rear end of the second transition connector (43) is fixed to the lower end of the first balancing plate body (31); the pressure sensor (41) is fixed to the lower end of the second balancing plate body (42); and a pressure head (44) is provided below the output end of the pressure sensor (41).

3. A rotor magnetic steel press-off force double-head testing mechanism according to claim 2, characterized in that: The upper end of the pressure head (44) is connected to a floating plate (45), a guide column (46) is provided on the floating plate (45), a linear bearing (47) is provided on the second balance plate body (42) at a position corresponding to the guide column (46), the outer periphery of the guide column (46) is slidably connected to the linear bearing (47), and the floating plate (45) can be completely separated from the output end of the pressure sensor (41) when it moves downward to the maximum distance.

4. A rotor magnetic steel press-off force double-head testing mechanism according to claim 3, characterized in that: First guide cut surfaces (32b) are provided on both sides of the first transition connector (32), and a first limiting guide plate (32c) slidably connected to the first guiding cut surfaces (32b) is provided on the first balancing plate body (31), wherein the setting direction of the first limiting guide plate (32c) is consistent with the arrangement direction of the two groups of pressure heads (44).

5. A rotor magnetic steel press-off force double-head testing mechanism according to claim 4, characterized in that: Second guide cut surfaces (43b) are provided on both sides of the second transition connector (43), and a second limiting guide plate (42b) slidably connected to the second guiding cut surface (43b) is provided on the second balance plate body (42), and the setting direction of the second limiting guide plate (42b) is consistent with the setting direction of the first limiting guide plate (32c).

6. A rotor magnetic steel press-off force double-head testing mechanism according to claim 5, characterized in that: The first card slot (31a) and the second card slot (42a) are U-shaped open slots.

7. A rotor magnetic steel press-off force double-head testing mechanism according to claim 1, characterized in that: The pressure sensor (41) is a weighing sensor.

8. The rotor magnetic steel press-off force double-head testing mechanism according to claim 1, characterized in that: The servo press (2) and the pressure sensor (41) are interlockedly controlled via a controller.

9. A rotor magnetic steel press-off force double-head testing mechanism according to claim 1, characterized in that: The fixed frame (1) is provided with a support column (11) along the output direction of the servo press (2).

10. A rotor magnetic steel press-off force double-head testing mechanism according to claim 1, characterized in that: The height difference compensation range of the balancing component (3) is ±0.5 mm.

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