An attachment case cantilever torque loading device based on electromagnet attraction force

Abstract

The application relates to an accessory case cantilever torque loading device based on electromagnetic attraction, which comprises cantilever force loading device supports, accessory case clamping fixtures, cantilever force loading accessories and test accessory case placement between the cantilever force loading device supports, a plurality of adjusting slide rails are fixedly installed on the top of the cantilever force loading device supports, a moving sliding block is slidably connected on the adjusting slide rails, four electromagnetic loading devices around the side of the cantilever force loading accessories are fixedly connected on the moving sliding block, the four electromagnetic loading devices are uniformly distributed and have the same structure, and the electromagnetic loading devices can realize multidirectional variable load loading of the cantilever force; the cantilever torque loading device overcomes the problems that most of the existing accessory case cantilever torque loading devices adopt weight loading, the weight loading has low precision, poor loading safety, single loading working condition, high labor intensity and cannot realize multidirectional loading of the cantilever force.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of accessory gearbox test loading of an aero-engine, and relates to an accessory gearbox cantilever torque loading device based on the attractive force of electromagnets. BACKGROUND

[0002] The engine accessory gearbox is installed on an engine, and accessories such as a starter generator, a fuel pump, an oil pump and the like are connected to the accessory gearbox in a cantilever manner. In the actual flight process, the accessory gearbox and the accessories often receive an overload of 5-6G due to acceleration and deceleration requirements. For some fighter aircraft and unmanned aerial vehicles, the maximum overload can reach 15-20G due to high maneuverability requirements. Under the overload condition, the accessories generate a cantilever torque, which causes a certain angular error between the spline connection between the accessories and the accessory gearbox. Moreover, the cantilever torque has an adverse effect on the internal gear meshing and bearing clearance of the accessory gearbox, thereby reducing the transmission stability and service life of the accessory gearbox. When performing a flight task, the aircraft often needs to perform rapid dive and climb, accelerate roll, hover and the like to meet the task requirements and improve the battlefield survival rate. These flight actions cause the cantilever torque borne by the accessories to be complex and changeable. In the engine, the cantilevered installation of the accessories on the accessory gearbox has poor installation structure stiffness, and the deformation caused under the complex and changeable overload condition affects the angular error of the internal spline, the gear meshing and the bearing clearance of the accessory gearbox, thereby adversely affecting the stability of the transmission system. According to the provisions in GJB 241A, when the accessory gearbox is subjected to a durability test, all the mounting seat transmission devices are at least loaded to the maximum cantilever torque nominal value to simulate the cantilever torque existing in the above-mentioned actual flight process.

[0003] At present, most of the cantilever torque loading devices for accessory gearboxes in China adopt a weight loading mode. This loading mode has the following problems: 1. The loading amount cannot be changed during the test process, and the test working condition of a single non-stop test is single; 2. The function of emergency stop loading in abnormal conditions cannot be realized, thereby reducing the test safety; 3. The weight cannot realize stepless loading, and the loading precision is insufficient; 4. The loading needs manual addition of weights, thereby increasing the working strength and safety risk of the test personnel; 5. The loading direction is single, and the cantilever torque multi-directional loading cannot be achieved.

[0004] The electromagnetic loading is performed by generating a magnetic field through energization of an electromagnet, and the force of mutual attraction between two electromagnets or between an electromagnet and a permanent magnet is utilized for loading. The loading force of the electromagnet can reach 0-2000N according to the type, and the loading is safer without direct contact. Under the condition that the number of turns, the magnetic permeability and the air gap are kept unchanged, the magnetic field strength and the current of the electromagnet that has not reached magnetic saturation are in a quadratic relationship, and the linear control of the loading force can be realized by utilizing the compensation of the control system, so that the electromagnetic force control is convenient and has the advantage of stepless loading. Meanwhile, the electromagnetic loading has a simple structure and is convenient to arrange compared with other loading forms. SUMMARY

[0005] Therefore, the accessory case cantilever torque loading device based on the electromagnetic attraction is provided to overcome the problems of low precision, poor loading safety, single loading working condition, high labor intensity and inability to realize multi-directional cantilever force loading of the existing accessory case cantilever torque loading device which mostly adopts weight loading, and to provide more real cantilever torque working conditions for accessory case tests.

[0006] To achieve the above object, the present application provides the following technical scheme:

[0007] An accessory case cantilever torque loading device based on electromagnetic attraction, wherein a test accessory case is installed on an accessory case clamping fixture, a cantilever force loading accessory is connected to the test accessory case and used to load the test accessory case, and the accessory case clamping fixture, the cantilever force loading accessory and the test accessory case are placed between cantilever force loading device supports, the top of each cantilever force loading device support is fixedly installed with a plurality of adjusting slide rails, a moving slide block is slidably connected to each adjusting slide rail, and four electromagnetic loading devices are fixedly connected to the moving slide block and arranged around the cantilever force loading accessory, the four electromagnetic loading devices are uniformly distributed and have the same structure, and the electromagnetic loading devices can realize multi-directional variable load loading of the cantilever force.

[0008] Further, each electromagnetic loading device comprises a ring-shaped shell for installing an electromagnet, the ring-shaped shells of adjacent electromagnetic loading devices are fixedly connected through an arc-shaped rod, and the moving slide block is fixedly connected to the ring-shaped shell.

[0009] Further, the inside of the ring-shaped shell of each electromagnetic loading device is sequentially provided with a strain gauge, an electromagnetic shielding shell I, an electromagnet and an electromagnetic shielding shell II, the electromagnet is sleeved in the electromagnetic shielding shell I, and the electromagnetic shielding shell II, the electromagnetic shielding shell I and the strain gauge are sequentially butted and fixedly connected to the ring-shaped shell.

[0010] Further, the outside of the ring-shaped shell is sequentially provided with a support rod, a self-lubricating bearing and a limiting cap, the self-lubricating bearing is sleeved on the support rod and installed on the ring-shaped shell, the upper segment of the support rod is fixedly connected to the limiting cap, the lower segment of the support rod penetrates through the ring-shaped shell and abuts against the strain gauge, and the limiting cap is fixedly connected to the moving slide block.

[0011] Further, the lower section of the support rod is a smooth rod, and the upper section is a threaded rod, the diameter of the threaded rod section is smaller than that of the smooth rod section, the smooth rod section of the support rod is matched with a self-lubricating bearing mounted on the annular shell, and the support rod is threadedly connected with the limiting cap. Beneficial effects: the smooth rod section of the support rod plays a guiding and supporting role, and is used to adjust the air gap between the electromagnet and the permanent magnet connected on the cantilever force loading accessory, so as to ensure that the air gap is between 0.5-1 mm.

[0012] Further, the threaded section of the support rod is sleeved with two locking nuts. Beneficial effects: the threaded section of the support rod adopts double nuts, which is used to complete positioning on one hand, and realize the tightening force transmission function with the limiting cap on the other hand.

[0013] Further, the surface of the electromagnet is fixedly installed with a photoelectric displacement sensor, and the strain sheet is used as a pressure sensor.

[0014] Further, the measuring and control system further comprises a control circuit, a signal conditioner, a data acquisition card, an industrial computer and an upper computer which are electrically connected with the photoelectric displacement sensor and the pressure sensor.

[0015] The accessory case cantilever torque loading device based on the electromagnetic attraction force loading method comprises the following steps:

[0016] S1, install the main structure of the loading device, align the loading device with the loading point;

[0017] S2, use the adjusting structure of the loading device, cooperate with the photoelectric displacement sensor to adjust the distance between the electromagnet of each group of electromagnetic loading devices and the corresponding permanent magnet on the cantilever force loading accessory to be kept between 0.5-1 mm;

[0018] S3, lock the loading device, and re-label the zero strain sheet pressure sensor;

[0019] S4, output the loading command or write the loading program on the upper computer, and control the electromagnet to load by the device measuring and control system.

[0020] The beneficial effects of the present application are:

[0021] 1. The accessory case cantilever torque loading device based on the electromagnetic attraction force disclosed in the present application, aiming at the requirement of applying cantilever torque to the accessory case test, the loading device of the present application not only includes all the functions of the original loading device, has the advantages of high loading precision, good loading safety, low labor intensity and variable load loading, but also realizes multi-directional cantilever force loading, so that the cantilever torque loading working condition is more consistent with the real flight condition, and the test effect of the accessory case is more prominent.

[0022] 2, The accessory case cantilever torque loading device based on the electromagnetic attraction force disclosed in the application has the following advantages: four direction cantilever forces are loaded on the accessory case by the electromagnet, the synthesized loading force in any direction of the plane is controlled by controlling the four direction cantilever forces, so that the cantilever torque loading in any direction is realized. The electromagnetic force generated between the electromagnets is between 0-2000N, which can meet the cantilever force loading needs of most accessories of 0-20G. The size of the loading force of the electromagnet is controlled by controlling the current size, and the characteristics can realize the stepless adjustment of the loading force in the test process, and meet the complex variable loading force demand. At the same time, the cantilever force and the real-time variable load spectrum loading control can be realized by the cooperation between multiple electromagnets. The loading device is equipped with a photoelectric displacement sensor and a distance adjusting structure. When the loading device is installed, the distance between the two electromagnets can be controlled by using the adjusting structure to control the distance between the two electromagnets according to the data displayed by the photoelectric sensor, so that the air gap between the two electromagnets is between 0.2-1mm, so as to achieve the purpose of stable loading. The loading device is equipped with a pressure sensor, which can monitor the loading force of the electromagnet in real time. If the loading does not meet the requirements, it can be adjusted in time to ensure the accuracy of the loading. The loading device is equipped with a corresponding loading measurement and control system, which can process the sensor signal and display it on the screen of the upper computer, and the loading control can be completed through the upper computer program, realizing the device loading monitoring and control function.

[0023] Other advantages, objects, and features of the present application will be apparent from the following specification, in part, based on the examination of the following description, or will be apparent from practice of the application. The goals and other advantages of the present application will be realized and attained by the embodiments described hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the purpose, technical scheme and advantages of the present application clearer, the preferred detailed description of the present application will be combined with the drawings as follows, wherein:

[0025] Figure 1 A schematic diagram of a device for cantilever torque loading using weights in the prior art;

[0026] Figure 2 A structural schematic diagram of the accessory case cantilever torque loading device based on the electromagnetic attraction force of the present application;

[0027] Figure 3 An explosion schematic diagram of the electromagnetic loading device in the present application; Figure 2

[0028] Figure 4 A measurement and control system schematic diagram of the cantilever torque loading device based on the electromagnetic force of the present application;

[0029] Figure 5 ​The operation flow chart of the cantilever torque loading device based on the electromagnetic force of the present application;

[0030] Figure 6 The schematic diagram of a flight attitude of an airplane in flight and the cantilever force on the accessories in the attitude in the embodiment of the present application, Figure 6 (a) is the diagram of the cantilever force change of the accessories in flight of the airplane, Figure 6 (b) is the diagram of the trajectory of the airplane in flight and the force on it;

[0031] Figure 7 The schematic diagram of the electromagnetic force and current change law of each electromagnet in the embodiment of the present application, Figure 7 (a) is the diagram of the force change law of each electromagnet, Figure 7 (b) is the diagram of the control current change law of each electromagnet.

[0032] The accompanying drawings are as follows: the accessory case clamping fixture 1, the cantilever force loading device support 2, the cantilever force loading accessory 3, the adjusting slide rail 4, the moving slide block 5, the electromagnetic loading device 6, the test accessory case 7, the inner hexagonal bolt 601, the limiting cap 602, the positioning locking nut 603, the self-lubricating bearing 604, the support rod 605, the outer hexagonal bolt I 606, the annular housing 607, the strain gauge 608, the electromagnetic shielding housing I 609, the electromagnet I 610, the photoelectric displacement sensor 611, the electromagnetic shielding housing II 612, the outer hexagonal bolt II 613, the electromagnet II 620, the electromagnet III 630, and the electromagnet IV 640. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below with specific reference to the drawings. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied in other different embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] The accompanying drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation on the present application. In order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product. It can be understood by those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0036] As Figure 1 The device schematic diagram for the cantilever moment loading by using the weight at present is shown, from the figure, the weight loading belongs to one-way static loading, which is inconsistent with the multi-way variable cantilever moment suffered by the aircraft accessories under the actual flight condition. At the same time, from the figure, it can be seen that once the danger occurs in the test process, the loading cannot be stopped urgently, and there is a certain safety hazard; the loading also needs to be loaded manually by the test personnel, and there is a certain construction danger; the loading precision is also determined by the weight block, and it is difficult to realize high-precision loading and cannot realize stepless loading; the weight needs to be customized according to the accessories, and there is the characteristic of poor universality.

[0037] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0038] As Figures 2-3 The device schematic diagram for the cantilever moment loading by using the weight at present is shown, from the figure, the weight loading belongs to one-way static loading, which is inconsistent with the multi-way variable cantilever moment suffered by the aircraft accessories under the actual flight condition. At the same time, from the figure, it can be seen that once the danger occurs in the test process, the loading cannot be stopped urgently, and there is a certain safety hazard; the loading also needs to be loaded manually by the test personnel, and there is a certain construction danger; the loading precision is also determined by the weight block, and it is difficult to realize high-precision loading and cannot realize stepless loading; the weight needs to be customized according to the accessories, and there is the characteristic of poor universality.

[0039] The accessory case cantilever torque loading device based on the electromagnetic attraction force, comprising a cantilever force loading device support 2, a adjusting slide rail 4 is fixedly installed on the top of the cantilever force loading device support 2, a moving slider 5 is slidably connected on the adjusting slide rail 4, four electromagnetic loading devices 6 are fixedly connected on the moving slider 5 and surround the side of the cantilever force loading accessory 3, the four electromagnetic loading devices 6 are uniformly distributed and have the same structure, and the electromagnetic loading device 6 can realize multi-directional variable load loading of the cantilever force. The electromagnet is fixedly connected on each electromagnetic loading device 6, the electromagnetic loading device 6 is used for adjusting the positions of the electromagnets in four directions, and the industrial computer is used for controlling the four electromagnets to realize the multi-directional variable load loading of the cantilever force in a certain order and a certain electromagnetic force. And the loading device is simple, the loading precision can reach 0.5N; the safety is high, the whole device can be stopped loading in emergency and does not need manual loading operation of the tester; the electromagnets on the four electromagnetic loading devices 6 are sequentially named as electromagnet I 610, electromagnet II 620, electromagnet III 630 and electromagnet IV 640, the four electromagnetic loading devices 6 have the same structure and are connected through arc-shaped rods, each electromagnetic loading device 6 comprises an annular housing 607, the annular housings 607 of adjacent electromagnetic loading devices 6 are fixedly connected through the arc-shaped rods, and the moving slider 5 and the annular housing 607 are connected through bolts. After the whole electromagnetic loading device 6 is adjusted to the specified loading point through the moving slider 5 on the adjusting slide rail 4, the pin is inserted between the moving slider 5 and the adjusting slide rail 4 for positioning and locking.

[0040] The inside of the annular housing 607 of each electromagnetic loading device 6 is sequentially provided with a strain gauge 608, an electromagnetic shielding housing I 609, an electromagnet I 610, an electromagnetic shielding housing II 612 and a plurality of outer hexagonal bolts II 613, the electromagnet I 610 is sleeved in the electromagnetic shielding housing I 609 and the surface of the electromagnet I 610 is fixedly installed with a photoelectric displacement sensor 611, the outer hexagonal bolts II 613 are sequentially passed through the electromagnetic shielding housing II 612, the electromagnetic shielding housing I 609 and the strain gauge 608 and are fixedly connected with the annular housing 607. The strain gauge 608 is used as a pressure sensor.

[0041] The support rod 605 is provided with two sections, one section is processed as a smooth rod, and the other section is processed with threads. The thread diameter is smaller than the diameter of the smooth rod. The smooth rod section of the support rod cooperates with the self-lubricating bearing 604 mounted on the annular shell 607, plays a guiding and supporting role, and is used to adjust the air gap between the electromagnet 610 and the permanent magnet connected on the cantilever force loading accessory 3, so as to ensure that the air gap is between 0.5 mm and 1 mm. The threaded section of the support rod 605 is sleeved with two locking nuts 603. The support rod 605 is in threaded connection with the limiting cover 602. The double nuts are used to complete positioning and realize force transmission with the limiting cover 602. The limiting cover 602 is provided with an inner hexagonal bolt 601 at four corners. The limiting cover 602 is fixedly connected with the moving slider 5 through the inner hexagonal bolt 601, and then the entire electromagnetic loading device 6 is fixedly connected with the moving slider 5.

[0042] The bottom of the support rod 605 is integrally provided with a base with a threaded hole. An outer hexagonal bolt I 606 is inserted into the threaded hole. The support rod 605 is fixedly connected with the annular shell 607 through the outer hexagonal bolt I 606.

[0043] The photoelectric displacement sensor 611 is installed at a specified position of the electromagnet I 610, the electromagnet II 620, the electromagnet III 630 and the electromagnet IV 640. When installed, the photoelectric displacement sensor 611 detects the distance between the electromagnet I 610, the electromagnet II 620, the electromagnet III 630 and the electromagnet IV 640 and the corresponding permanent magnet connected on the cantilever force loading accessory 3. The photoelectric displacement sensor 611 can also be used to detect the displacement change between the two electromagnets caused by the applied load in the test. The data of the photoelectric displacement sensor 611 can be connected to the measurement and control system and displayed on the screen of the upper computer as an important evaluation standard of whether the loading state is normal.

[0044] The strain gauge 608 is placed between the support rod 605 and the electromagnetic shielding shell 609. The support rod 605 and the annular shell 607 are connected through a bolt. The pre-tightening force of the bolt causes the strain gauge 608 to deform, so that the strain gauge 608 has an initial pressure value. The strain gauge 608 is re-labeled zero on the upper computer. The re-labeled zero strain gauge 608 has the functions of detecting pressure and tension. The detection of pressure is realized by the strain gauge detecting stress with a positive value. The detection of tension is realized by the decrease of the pre-tightening force of the bolt caused by tension, which is represented by a negative value of the detected stress.

[0045] The current of the electromagnet is controlled by the rheostat in the control circuit of the measuring and control system. The current of the electromagnet is measured by the ammeter connected in series with the electromagnet, and the voltage is measured by the voltmeter connected in parallel with the electromagnet. The measured values of the rheostat resistance, ammeter and voltmeter are integrated into the host computer, which is an important criterion for detecting whether the loading is normal.

[0046] The entire accessory case cantilever torque loading device based on the electromagnetic attraction force further comprises a measuring and control system. The schematic diagram of the measuring and control system of the loading device is shown in Figure 4 The photoelectric sensor 611 and the pressure sensor collect signals which are transmitted to the industrial computer for storage and displayed on the host computer screen after being processed by the signal conditioner and data acquisition. The ammeter and voltmeter in the electromagnet circuit are also connected to the industrial computer and displayed on the host computer, and the resistance of the adjustable rheostat box is not only displayed on the host computer, but also adjusted by inputting commands or programs through the host computer. The current of the electromagnet is controlled by the rheostat in the control circuit of the measuring and control system. The current of the electromagnet is measured by the ammeter connected in series with the electromagnet, and the voltage is measured by the voltmeter connected in parallel with the electromagnet. The measured values of the rheostat resistance, ammeter and voltmeter are integrated into the host computer, which is an important criterion for detecting whether the loading is normal.

[0047] Figure 5 The flow chart of the use of the device is shown in the figure. First, adjust the device to align the loading point, then adjust the distance between the electromagnet of each group of electromagnet loading device 6 and the permanent magnet on the corresponding cantilever force loading accessory 3 to 0.5-1mm using the photoelectric sensor, lock the electromagnet and the support rod, and reset the strain gauge zero. After completing the above operations, power on the electromagnet, adjust the resistance of the rheostat to make the current of the electromagnet neither overloaded nor meet the loading requirements, and finally carry out the loading test. The current of the electromagnet is recorded on the ammeter and transmitted to the host computer for judgment. If the current exceeds the rated current of the electromagnet, the electromagnet is powered off. If the current does not exceed the rated current of the electromagnet, the loading force is recorded by the pressure sensor and the signal is transmitted to the host computer for judgment. If the loading force does not meet the requirements, adjust the resistance of the rheostat to judge the current of the electromagnet and the loading force until the loading force meets the specified loading requirements.

[0048] Embodiment

[0049] Now the multi-directional loading capacity of the cantilever force of the device under certain working conditions is described. As shown in Figure 6(b) shows a certain flight trajectory of the aircraft and its force situation under the trajectory, from which it can be seen that the tangential and normal forces of the aircraft are always changing in the process, and the cantilever force of the accessory is also changing. Now simplify the cantilever force of the accessory as Figure 6 (a) shows that F1 is changed into F n under the simplified industrial control. The force size is unchanged but the direction is constantly changing. Assuming that the applied cantilever force size is F i , then according to the principle of vector composition of force, the cantilever force of F i in any direction can be composed of two mutually orthogonal loading forces. That is, F i can be obtained from the following formula:

[0050] F i (t) = F1 cos(wt) + F2 sin(wt) (1)

[0051] where F1, F2 are two mutually orthogonal electromagnetic forces, and the electromagnetic force amplitude has |F1| = |F2| = |F i |; the cantilever force of the accessory can be realized by changing the input electromagnetic force of the electromagnet according to the above law, as shown in (a) shows the change law of the electromagnetic force of the four electromagnets under this working condition. The loading force size of the electromagnet is compensated by using the control system to realize the linear control relationship between the control current and the electromagnetic loading force, so that the current is changed according to

[0052] (b) shows the law, that is, the above electromagnetic force change requirement can be realized. Figure 7 Figure 7

[0053] ​The accessory case cantilever torque loading device based on the electromagnetic attraction force loads four directions cantilever force on the accessory case through electromagnets, and controls the synthesized loading force in any direction in a plane to realize the cantilever torque loading in any direction. The electromagnetic force generated between the electromagnets is between 0-2000N, which can meet the cantilever force loading needs of most accessories of 0-20G. The loading force size of the electromagnets is controlled by controlling the current size, and the loading force can be infinitely adjusted during the test process by using the feature, which meets the complex variable loading force needs. Meanwhile, the cantilever force and real-time variable load spectrum can be loaded and controlled by the cooperation between multiple electromagnets. The loading device is equipped with photoelectric displacement sensors and distance adjustment structures, and when the loading device is installed, the distance between the two electromagnets can be controlled by using the adjustment structure according to the data displayed by the photoelectric sensor, so that the air gap between the two electromagnets is between 0.2-1mm to achieve the purpose of stable loading. The loading device is equipped with pressure sensors, which can monitor the loading force of the electromagnets in real time, and the adjustment can be made in time if the loading does not meet the requirements to ensure the accuracy of the loading. The loading device is equipped with a corresponding loading measurement and control system, which can process the sensor signals and display them on the screen of the host computer, and the loading control can be completed through the host computer program to realize the loading monitoring and control functions of the device.

[0054] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the present application.

Claims

1. An attachment case cantilever torque loading device based on electromagnetic attraction force, wherein a test attachment case (7) is mounted on an attachment case clamping jig (1), and a cantilever loading attachment (3) is cantilever-connected to the test attachment case (7) for loading the test attachment case (7), characterized in that, The utility model provides a cantilever force loading device support (2), the accessory magazine clamping fixture (1), cantilever force loading accessory (3) and test accessory magazine (7) are placed between cantilever force loading device support (2), a plurality of adjusting slide rails (4) are fixedly installed on the top of cantilever force loading device support (2), the mobile slider (5) is connected on the adjusting slide rail (4) and slides, four electromagnetic loading devices (6) are fixedly connected on the mobile slider (5) and surround the lateral side of cantilever force loading accessory (3), the four electromagnetic loading devices (6) are evenly distributed and same structure, and the electromagnetic loading device (6) can realize the multidirectional variable load loading of cantilever force, Each electromagnetic loading device (6) includes a ring-shaped housing (607) for mounting an electromagnet, the ring-shaped housings (607) of adjacent electromagnetic loading devices (6) are fixedly connected by an arc-shaped rod, and the mobile slider (5) is fixedly connected with the ring-shaped housing (607). Inside the ring-shaped housing (607) of each electromagnetic loading device (6) is sequentially provided with a strain gauge (608), an electromagnetic shielding housing I (609), an electromagnet, and an electromagnetic shielding housing II (612). The electromagnet is sleeved in the electromagnetic shielding housing I (609), and the electromagnetic shielding housing II (612), the electromagnetic shielding housing I (609), and the strain gauge (608) are sequentially connected with the ring-shaped housing (607).

2. The attachment box cantilever moment loading device of claim 1, wherein, The ring-shaped housing (607) is sequentially provided with a support rod (605), a self-lubricating bearing (604), and a limiting cap (602) outside. The self-lubricating bearing (604) is sleeved on the support rod (605) and installed on the ring-shaped housing (607). The upper segment of the support rod (605) is fixedly connected with the limiting cap (602), and the lower segment of the support rod (605) passes through the ring-shaped housing (607) and abuts against the strain gauge (608). The limiting cap (602) is fixedly connected with the mobile slider (5).

3. An attachment bin cantilever moment loading apparatus as claimed in claim 2 wherein, The lower segment of the support rod (605) is a smooth rod, and the upper segment is a threaded rod. The diameter of the threaded rod segment is smaller than that of the smooth rod segment. The smooth rod segment of the support rod cooperates with the self-lubricating bearing (604) installed on the ring-shaped housing (607). The support rod (605) is threadedly connected with the limiting cap (602).

4. The attachment box cantilever moment loading device of claim 3, wherein, The threaded segment of the support rod (605) is sleeved with two locking nuts (603).

5. The attachment box cantilever moment loading device of claim 1, wherein, The surface of the electromagnet is fixedly installed with an optical displacement sensor (611), and the strain gauge (608) serves as a pressure sensor.

6. An attachment bin cantilever moment loading apparatus as claimed in claim 5 wherein, The utility model also includes a measurement and control system, which includes a control circuit, a signal conditioner, a data acquisition card, an industrial computer, and an upper computer electrically connected with the optical displacement sensor (611), the pressure sensor, and the electromagnet.

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