WO2022000788A1

WO2022000788A1 - Magnetic guide structure of moving coil, vibration table having magnetic guide structure, and adjustment method

Info

Publication number: WO2022000788A1
Application number: PCT/CN2020/114784
Authority: WO
Inventors: 张雷雷; 徐付新
Original assignee: 苏州苏试试验集团股份有限公司
Priority date: 2020-06-30
Filing date: 2020-09-11
Publication date: 2022-01-06
Also published as: CN111649892A

Abstract

A magnetic guide structure (6, 7) of a moving coil, a vibration table having the magnetic guide structure, and an adjustment method. The magnetic guide structure comprises armatures (63) and electromagnetic coils (62) matched with the armatures (63); each electromagnetic coil (62) is energized to form a magnetic field; and a gap is formed between the electromagnetic coil (62) and each armature (63). The adjustment method comprises: S1, position collection: collecting, by means of displacement sensors (64), a distance between a moving coil (3) and a cylinder (2), and feeding back to a controller; S2, signal processing: the controller compares collected distance signals in multiple directions and calculates a difference value in each direction, and the controller calculates, according to the difference value, the current of the electromagnetic coil (62) in each direction; and S3, position adjustment: the controller outputs a current value to the electromagnetic coil (62) to adjust the position of the moving coil (3), so that the moving coil is located at a central position. The method can solve the problem that the low-frequency distortion of the moving coil (3) of the vibration table is large, also can reduce the problems that the guide structure (6, 7) is large in abrasion and large in loss, and further can solve the problem that the guide structure (6, 7) has resonant abnormal sound at a low frequency when in use.

Description

Magnetic guiding structure of moving coil, vibrating table having the same, and adjustment method

This application claims the priority of the Chinese patent application whose filing date is June 30, 2020, the application number is 202010621478.1, and the invention title is "A magnetic guiding structure for moving coil, a vibration table having the same, and an adjustment method". The entire contents of this application are incorporated by reference.

technical field

The invention relates to the technical field of vibration testing, in particular to a magnetic guiding structure of a moving coil, a vibration table having the same, and an adjustment method.

Background technique

The electrodynamic vibration table can simulate various vibration mechanical environments, and is widely used in the simulation test of various typical vibrations such as auto parts, electronic components, and aerospace products stress screening. In the design and manufacture of the shaking table, the moving coil guide is particularly important, and the moving coil guide directly affects the distortion index of the table body.

At present, in order to constrain the movement of the moving coil in the desired direction and reduce the movement in other directions, the electric vibrating table at home and abroad guides the movement of the moving coil of the vibrating table. There are generally two types of guiding devices at present. As shown in Figure 1, the first one is the guide wheel guide mechanism 8, which is divided into upper and lower two groups of guide wheel guide mechanisms 8. The upper and lower guides are divided into multiple groups of guide wheel guide components. The advantage of the guide wheel guide mechanism 8 is that it is simple, and due to the The lower guide wheel guide mechanism 8 is small in size, and can directly install the air spring that supports the moving coil 3 and the weight of the test piece. The disadvantage is that 1. Due to the direct contact and friction between the guide wheel guide mechanism 8 and the moving coil 3 components, the moving coil 3 is disturbed. 2. The anti-eccentric load capacity of the guide wheel guide mechanism 8 is limited; 3. The large displacement vibration is limited by the upper guide wheel guide mechanism 8, and the deflection angle cannot be too large, while the guide wheel guide mechanism 8 Possibly large. As shown in Figure 2, the second type is the hydraulic static pressure guide mechanism 9, which is also divided into upper and lower groups. The advantage is that the anti-eccentric load capacity is relatively large, and in theory, as long as the pressure is not lost and the remote components are not in contact; the disadvantage is that 1 . Due to the wide movement frequency range (5-3000Hz) of the moving coil 3 and the large movement acceleration (100g), it is very difficult for the oil seal to solve the problem of oil leakage; 2. The support moving coil 3 and the weight of the test piece cannot be directly connected The air spring can only seal the entire space of the shaker to form a large air chamber, which makes these seals difficult due to the connection between the shaker and the outside with water pipes and cables.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a moving coil magnetic guide structure, a vibration table and an adjustment method thereof, which can eliminate the shortcomings of the guide wheel guide structure and the hydraulic static pressure guide mechanism.

The technical solution adopted by the present invention to solve the technical problem is as follows: a magnetic guiding structure for a moving coil, which is arranged between the moving coil and the cylinder body on the vibrating table, and includes an armature and an electromagnetic coil matched with the armature. The electromagnetic coil is energized to form a magnetic field, and a gap is formed between the electromagnetic coil and the armature.

More specifically, a displacement sensor for detecting the distance between the moving coil and the cylinder is arranged on the cylinder body, and a controller is arranged on the vibration table, and the controller receives the signal of the displacement sensor and controls the electromagnetic coil. the current.

More specifically, the displacement sensor is a differential transformer type displacement sensor.

A vibrating table includes a cylinder support fixed on the ground, a cylinder set on the cylinder support, a moving coil located in the cylinder, a magnet set in the cylinder, and a winding wound on the moving coil The above-mentioned magnetic guide structure is used as the upper guide assembly between the upper part of the moving coil and the cylinder, and the above-mentioned magnetic guide structure is used between the bottom of the moving coil and the cylinder as the lower guide assembly.

More specifically, there are at least three sets of the upper guide assemblies and are evenly distributed around the moving coil.

More specifically, there are at least three sets of the lower guide components and are evenly distributed around the moving coil.

More specifically, the lower guide components are four groups and are evenly distributed around the moving coil.

A method for adjusting the distance between a moving coil and a cylinder of a vibrating table. The above-mentioned magnetic guiding structure is applied to the vibrating table, and there are at least three sets of magnetic guiding structures. The adjusting method is as follows:

S1, position acquisition, the distance between the moving coil and the cylinder is collected by the displacement sensor and fed back to the controller;

S2. Signal processing. The controller compares the collected distance signals in multiple directions and calculates the difference in each direction. The controller calculates the current in the electromagnetic coil in each direction according to the difference. size;

S3, position adjustment, the controller outputs the current value to the electromagnetic coil to adjust the position of the moving coil so that the moving coil is in the center position.

More specifically, the displacement sensor collects the distance information once, and the adjustment method is executed once.

The beneficial effects of the present invention are: through the cooperation of the electromagnetic coil and the armature, a gap is generated between them, and the moving coil is moved up and down in the gap, so as to achieve the purpose of no friction, and solve the problem of using the guide wheel guide mechanism and the hydraulic static pressure guide. The defects caused by the mechanism can solve the problem of large low-frequency distortion of the moving coil of the shaking table, and at the same time, it can also reduce the problems of large wear and loss of the moving coil guide parts, and can also solve the problem that the guide parts have resonance and abnormal noise at low frequencies during use.

Description of drawings

Fig. 1 is the structural representation of the first prior art;

Fig. 2 is the structural representation of the second prior art;

Fig. 3 is the structural representation of the present invention;

Fig. 4 is the structural representation of the upper guide assembly of the present invention;

Fig. 5 is the structural representation of the lower guide assembly of the present invention;

FIG. 6 is a schematic diagram of the adjustment method of the present invention.

In the figure: 1. Cylinder support; 2. Cylinder; 3. Moving coil; 4. Magnet; 5. Winding; 6. Upper guide assembly; 7. Lower guide assembly; 61, Guide seat; 62, Electromagnetic coil; 63, armature; 64, displacement sensor; 8, guide wheel guide mechanism; 9, hydraulic static pressure guide mechanism.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 3, a vibrating table includes a cylinder support 1 fixed on the ground, a cylinder 2 arranged on the cylinder support 1, a moving coil 3 located in the cylinder 2, and a cylinder 2 arranged in the cylinder 2. The magnet 4 inside and the winding 5 wound on the moving coil 3 energize the winding 5 on the moving coil 3 to generate a magnetic field. The magnetic field and the magnetic field of the magnet make the moving coil 3 vibrate at high and low frequencies. In order to ensure the moving coil 3. The movement is stable. An upper guide assembly 6 is set between the upper part of the moving coil 3 and the cylinder block 2, a lower guide assembly 7 is set between the bottom of the moving coil 3 and the cylinder block 2, and the upper guide assembly is connected to the lower guide assembly. The guide components are all composed of magnetic guide structures. In this solution, the upper guide components are composed of 3 sets of magnetic guide structures. The 3 sets of magnetic guide structures are evenly distributed around the moving coil, with an angle of 120° between the two; the lower guide The component is composed of 4 sets of magnetic guide structures, which are evenly distributed around the moving coil 3, and the angle between them is 90°; the vibration table can choose different numbers of magnetic guide structures according to its size and the weight of the moving coil 3 Make settings.

As shown in FIG. 4 and FIG. 5 , the magnetic guide structure includes an armature 63 and an electromagnetic coil 62 matched with the armature 63 . In this solution, the armature 63 is fixed on the moving coil 3 , and the electromagnetic coil 62 is fixed on the cylinder through the guide seat 61 2, the guide seat 61 can fine-tune the distance between two adjacent electromagnetic coils 62, the electromagnetic coil 62 is energized to form a magnetic field, and a gap is formed between the electromagnetic coil 62 and the armature 63, and the upper guide assembly 6 The distances between each group of electromagnetic coils 62 and the armature 63 are equal, and the distances between each group of electromagnetic coils 62 and the armature 63 in the lower guide assembly 7 are equal, so as to ensure the smoothness of the moving coil 3 moving up and down.

When the distance between the electromagnetic coil 62 and the armature 63 changes and is no longer equal, the movement of the moving coil 3 is no longer stable, and the position of the moving coil 3 needs to be adjusted. A displacement sensor 64 for detecting the distance between the moving coil 3 and the cylinder body 2 is provided. The displacement sensor 64 is arranged on the cylinder body 2 through a fixed seat. A controller is set on the vibration table to monitor the moving coil 3 in real time through the displacement sensor 64. The controller receives the signal of the displacement sensor 64 and controls the current of the electromagnetic coil 62 according to the change of the distance from the cylinder 2 . The displacement sensor 64 adopts a differential transformer type displacement sensor. The advantages of the displacement sensor 64 are: 1. Taking micro-displacement as the measurement object; 2. High sensitivity and strong anti-interference ability; 3. There is a linear relationship between displacement and output.

As shown in FIG. 6, the distance change monitored by the displacement sensor 64, the adjustment method of the controller to adjust the current output is:

S1, position acquisition, the distance between the moving coil 3 and the cylinder 2 is collected by the displacement sensor 64 and fed back to the controller, the three displacement sensors 64 of the upper guide assembly 6 detect the distances in three horizontal directions; the lower guide assembly The 4 displacement sensors 64 of 7 detect the distances in 4 horizontal directions.

S2, signal processing, the controller compares the collected distances in the three horizontal directions of the upper guide assembly 6 and calculates the difference between them. The controller first calculates the distance in each direction according to these differences The required force is calculated according to the force in each direction to obtain the required current in the electromagnetic coil 62 in each direction; the calculation methods of the four horizontal directions of the lower guide assembly 7 are the same as The calculation method is the same.

S3, position adjustment, the controller outputs the current value of the electromagnetic coil 62 to adjust the position of the moving coil 3 so that the moving coil 3 is located at the center position; by increasing or decreasing the current value in the corresponding electromagnetic coil 62 to control the magnitude of the force in all directions to achieve Adjustment to the centering of the moving coil 3 position.

The above-mentioned displacement sensor 64 collects the distance information in real time, and performs the above-mentioned steps to adjust the position of the moving coil 3 every time it is collected until the position returns to the center. Centrally located.

To sum up, through the cooperation of the electromagnetic coil 62 and the armature 63, a gap is generated between them, and the moving coil 3 is moved up and down in the gap, so as to achieve the purpose of no friction, and solve the problem of using the guide wheel guide mechanism 8 and the hydraulic static pressure guide. The defects generated by the mechanism 9 can solve the problem of large low-frequency distortion of the moving coil 3 of the shaking table, and can also reduce the problems of large wear and loss of the guiding parts of the moving coil 3, and can also solve the problem that the guiding parts have resonance and abnormal sound at low frequencies during use. Problem: The distance is collected by the displacement sensor 64, and the controller compares and calculates the distance and outputs the corresponding current to adjust the centering of the moving coil 3, realize automatic real-time adjustment, and improve the stability of the moving coil 3 movement.

It should be emphasized that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are Still belong to the scope of the technical solution of the present invention.

Claims

A magnetic guiding structure for a moving coil, which is arranged between a moving coil (3) on a vibrating table and a cylinder (2), characterized in that it comprises an armature (63) and an electromagnetic coil (62) matched with the armature (63). ), the electromagnetic coil (62) is energized to form a magnetic field, and a gap is formed between the electromagnetic coil (62) and the armature (63).
The magnetic guiding structure of the moving coil according to claim 1, characterized in that a displacement sensor (64) for detecting the distance between the moving coil (3) and the cylinder (2) is provided on the cylinder (2) , a controller is arranged on the vibration table, and the controller receives the signal of the displacement sensor (64) and controls the current of the electromagnetic coil (62).
The magnetic guiding structure of the moving coil according to claim 2, wherein the displacement sensor (64) is a differential transformer type displacement sensor.
A vibrating table, comprising a cylinder support (1) fixed on the ground, a cylinder (2) arranged on the cylinder support (1), a moving coil (3) located in the cylinder (2), The magnet (4) arranged in the cylinder (2) and the winding (5) wound on the moving coil (3) are characterized in that between the upper part of the moving coil (3) and the cylinder (2) The magnetic guide structure described in any one of claims 1 to 3 is used as the upper guide assembly (6), and any one of claims 1 to 3 is used between the bottom of the moving coil (3) and the cylinder (2). The magnetic guide structure described in one item is used as a lower guide assembly (7).
The vibrating table according to claim 4, characterized in that, the upper guide assemblies (6) are at least three groups and are evenly distributed around the moving coil (3).
The vibrating table according to claim 4, characterized in that, the lower guide assemblies (7) are at least three groups and are evenly distributed around the moving coil (3).
The vibrating table according to claim 4, characterized in that, the lower guide assemblies (7) are four groups and are evenly distributed around the moving coil (3).
A method for adjusting the distance between the moving coil and the cylinder of a vibrating table, the magnetic guiding structure of claim 2 is applied on the vibrating table, and the magnetic guiding structure is at least three groups, and it is characterized in that, the adjusting method is:

S1. Position acquisition, the distance between the moving coil (3) and the cylinder block (2) is acquired through the displacement sensor (64) and fed back to the controller;

S2, signal processing, the controller compares the collected distance signals in multiple directions and calculates the difference in each direction, and the controller calculates the electromagnetic coil in each direction according to the difference (62 ) current size;

S3, position adjustment, the controller outputs the current value to the electromagnetic coil (62) to adjust the position of the moving coil (3) so that the moving coil (3) is located at the center position.
The method for adjusting the distance between the moving coil and the cylinder of the vibrating table according to claim 8, wherein the displacement sensor (64) collects the distance information once, and the adjustment method is executed once.