A moving coil position adjustment device

Abstract

The invention discloses a dynamic coil position adjustment device, which is placed on a vibration table body. The vibration table body includes a lower plate of the vibration table. The dynamic coil position adjustment device includes a pull rod, an air spring, and a force transmission guide rod. The first end of the pull rod is fixed to the lower guide rod of the dynamic coil. The first action end of the air spring is fixed to the lower plate of the vibration table. The first action end of the air spring is arranged close to the lower guide rod of the dynamic coil. The force transmission guide rod is connected to the second action end of the air spring. The second end of the pull rod is connected to the force transmission guide rod, and the air spring is placed between the lower plate of the vibration table and the force transmission guide rod. The present application is installed on the outside of an ordinary vibration table as an accessory, does not change the internal structure of the existing ordinary vibration table, does not need to configure a negative pressure source, and does not need to modify the existing dynamic coil position control system. It can be applied to a low pressure-vibration comprehensive environment, and has the advantages of low cost, simple structure, fast adjustment speed, and a wide applicable air pressure range.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental test equipment, and in particular relates to a moving coil position adjustment device. Background Art

[0002] When the vibration equipment is running, the center position of its dynamic coil needs to be kept at the working zero position. The method of adjusting the dynamic coil position is to design a sealed air chamber between the dynamic coil and the table body of the vibration table, and adjust the pressure of the sealed air chamber through the dynamic coil position control system to generate a pressure difference at both ends of the dynamic coil. This pressure difference causes the dynamic coil to be subjected to a thrust in the opposite direction of gravity, which is balanced with the gravity of the load (dynamic coil, fixture, test piece and other effective moving parts), so that the working position of the dynamic coil is kept at the working zero position.

[0003] The upper end of the dynamic coil of an ordinary vibration table is in the atmospheric environment. In order to balance the gravity of the load, the air pressure in its sealed air chamber should be greater than the atmospheric pressure. Therefore, the dynamic coil position control system of an ordinary vibration table only needs to design a simple control function that can adjust the inflation (the sealed air chamber is connected to the high-pressure air source) and exhaust (the sealed air chamber is connected to the atmosphere) time to achieve the purpose of controlling the dynamic coil position.

[0004] In the low-pressure-vibration comprehensive environmental test equipment, the upper end of the vibration table is in a low-pressure box, and the upper end of the dynamic coil will be subjected to a suction force in the opposite direction of gravity. When the air pressure in the low-pressure box is lower than a certain value, the suction force will be greater than the gravity of the load. At this time, the sealed air chamber needs to maintain a negative pressure to balance the suction force on the upper part of the dynamic coil, and the dynamic coil position control system needs to provide a negative pressure source to access the exhaust port. Although this method can utilize the existing structure of the vibration table, it only needs to add a negative pressure source to achieve dynamic coil position control under low pressure and basically does not affect the original system performance. However, when the load is small, the air pressure required to be maintained in the sealed air chamber is very low, and a negative pressure source with a very low rated working pressure is required, which is costly; at the same time, the pressure difference between the sealed air chamber and the negative pressure source is small, which may cause a low response speed of position adjustment, limiting the low-pressure simulation range of the low-pressure-vibration comprehensive environmental test equipment.

[0005] Therefore, it is urgent to develop a moving coil position adjustment device to solve the above problems. Summary of the invention

[0006] In order to solve the problems raised in the above background technology, the present invention provides a moving coil position adjustment device.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A dynamic coil position adjustment device is placed on a vibration table body, the vibration table body includes a vibration table lower plate, and the dynamic coil position adjustment device includes:

[0009] Pull rod; the first end of the pull rod is fixed on the guide rod under the moving coil;

[0010] Air spring; the first action end of the air spring is fixed on the lower plate of the vibration table; the first action end of the air spring is arranged close to the lower guide rod of the moving coil;

[0011] The force transmission guide rod is connected to the second action end of the air spring; the second end of the pull rod is connected to the force transmission guide rod, and the air spring is placed between the lower plate of the vibration table and the force transmission guide rod.

[0012] Specifically, the moving coil position adjustment device also includes a compressed air source and an air pipe, and the compressed air source is connected to the air spring through the air pipe.

[0013] As a preferred embodiment, a stop valve is provided on the air pipe.

[0014] As another preferred embodiment, a pressure reducing valve is provided on the air pipe.

[0015] Preferably, a through hole is provided in the force transmission guide rod, a section of the pull rod has a diameter larger than the through hole, another section of the pull rod has a diameter slightly smaller than the through hole, an external thread is provided at the second end of the pull rod, and the small diameter section of the pull rod passes through the through hole and is locked by a locking nut after coming out.

[0016] Specifically, the dynamic coil position adjustment device also includes a mounting seat; the mounting seat is formed into a structure with a groove, and the mounting seat is fixed on the lower plate of the vibration table. The groove of the mounting seat is embedded in the opening of the lower plate of the vibration table, the air spring is placed in the groove, and the first action end of the air spring is fixed at the bottom of the groove, and the pull rod is arranged through the groove.

[0017] Specifically, the moving coil position adjustment device also includes a bearing mounting seat and a linear motion bearing. The bearing mounting seat is fixedly mounted on the mounting seat, the linear motion bearing is mounted on the bearing mounting seat, the force transmission guide rod is installed through the linear motion bearing, and the linear motion bearing is used to support and guide the force transmission guide rod.

[0018] Preferably, an internal threaded hole is provided at the end of the guide rod under the moving coil, an external thread is provided on the first end of the pull rod, and the first end of the pull rod is threadedly connected to the end of the guide rod under the moving coil.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present application is installed as an accessory on the outside of an ordinary vibration table. It does not change the internal structure of the existing ordinary vibration table, does not require the configuration of a negative pressure source, and does not modify the existing dynamic position control system. It can be applied to a low-pressure-vibration integrated environment and has the advantages of low cost, simple structure, fast adjustment speed, and a wide applicable air pressure range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the structure of the present invention.

[0022] Figure 2 for Figure 1 A partial enlarged view of part I.

[0023] Figure 3 For the second embodiment Figure 1 A partial enlarged view of part I in the figure.

[0024] In the figure: 1. vibration table body, 2. lower plate of vibration table, 3. mounting seat, 4. pull rod, 5. lower guide rod of moving coil, 6. air spring, 7. force transmission guide rod, 8. stop valve, 9. compressed air source, 10. air pipe, 11. bearing mounting seat, 12. bearing cover, 13. locking nut, 14. linear motion bearing. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention provides the following technical solutions:

[0027] like Figure 1 and Figure 2 As shown, a dynamic coil position adjustment device is placed on a vibration table body 1, the vibration table body 1 includes a vibration table lower plate 2, and the dynamic coil position adjustment device includes:

[0028] Pull rod 4; the first end of the pull rod 4 is fixed on the guide rod 5 under the moving coil;

[0029] Air spring 6; the first action end of the air spring 6 is fixed on the lower plate 2 of the vibration table; the first action end of the air spring 6 is arranged close to the lower guide rod 5 of the moving coil;

[0030] The force transmission guide rod 7 is connected to the second action end of the air spring 6; the second end of the pull rod 4 is connected to the force transmission guide rod 7, and the air spring 6 is placed between the lower plate 2 of the vibration table and the force transmission guide rod 7.

[0031] The present application is installed in the cylindrical space below the lower part of the ordinary vibration table body and the lower guide rod of the moving coil, so as to achieve the purpose of not increasing the outer dimensions of the vibration table. By inflating the air spring, the force transmission guide rod and the pull rod move downward, so that the moving coil is subjected to a downward pulling force, which is greater than or equal to the suction force received by the upper end of the moving coil in the low-pressure box; the present application presets a fixed downward pulling force for the moving coil, so that the air pressure of the sealed air chamber inside the vibration table is always greater than the standard atmospheric pressure, so that the position adjustment system of the vibration table can achieve the adjustment of the position of the moving coil under low pressure without adding a negative pressure source or changing the original control system.

[0032] In some embodiments, the air spring 6 is formed in a ring shape, and the tie rod 4 is disposed through the center of the air spring 6 .

[0033] like Figure 2 As shown, the moving coil position adjustment device further includes a compressed air source 9 and an air pipe 10 , and the compressed air source 9 is connected to the air spring 6 through the air pipe 10 .

[0034] In this embodiment, the pressure charged into the air spring is Satisfy the conditions This can not only achieve rapid adjustment of the moving coil position, but also have lower pressure requirements for the compressed air source and less impact on the dynamic characteristics of the entire system.

[0035] like Figure 2 As shown, as a preferred embodiment, a stop valve 8 is provided on the air pipe 10 .

[0036] Not shown in the figure, as another preferred embodiment, a pressure reducing valve is provided on the air pipe 10, and the stop valve 8 is replaced with a pressure reducing valve, and the pressure reducing valve is connected to the compressed air source 9. In this way, when the device has a slight air leakage, the air spring is inflated through the pressure reducing valve, so that the pressure of the air spring is more stable.

[0037] like Figure 2 As shown, a through hole is provided in the force transmission guide rod 7, a section of the pull rod 4 has a diameter larger than the through hole, another section of the pull rod 4 has a diameter slightly smaller than the through hole, an external thread is provided at the second end of the pull rod 4, and the small diameter section of the pull rod 4 passes through the through hole and is locked by a locking nut 13 after coming out.

[0038] like Figure 2 As shown, the dynamic coil position adjustment device also includes a mounting seat 3; the mounting seat 3 is formed into a structure with a groove, and the mounting seat 3 is fixed on the lower pole plate 2 of the vibration table. The groove of the mounting seat 3 is embedded in the opening of the lower pole plate 2 of the vibration table, the air spring 6 is placed in the groove, and the first action end of the air spring 6 is fixed at the bottom of the groove, and the pull rod 4 is arranged through the groove.

[0039] In this embodiment, a groove is also formed on the mounting seat 3 , and the grooves on the mounting seat 3 are connected with the grooves of the mounting seat 3 to form a sliding channel that allows the air spring 6 to deform and the force transmission guide rod 7 to slide.

[0040] In this embodiment, an opening is provided on the mounting seat 3 , and the air pipe 10 passes through the opening of the mounting seat 3 and is led out to the outside of the device, and is connected to the compressed air source 9 through the stop valve 8 .

[0041] like Figure 2 As shown, the moving coil position adjustment device also includes a bearing mounting seat 11 and a linear motion bearing 14. The bearing mounting seat 11 is fixedly mounted on the mounting seat 3, the linear motion bearing 14 is mounted on the bearing mounting seat 11, and the force transmission guide rod 7 is installed through the linear motion bearing 14. The linear motion bearing 14 is used to support and guide the force transmission guide rod 7.

[0042] In this embodiment, the linear motion bearing 14 is mounted on the bearing mounting seat 11 through the bearing cover 12. The present application adopts the linear motion bearing for guiding, which ensures that the force transmission guide rod moves flexibly without deflection and jamming;

[0043] like Figure 3 As shown, an internal thread hole is provided at the end of the guide rod 5 under the moving coil, an external thread is provided on the first end of the pull rod 4, and the first end of the pull rod 4 is threadedly connected to the end of the guide rod 5 under the moving coil.

[0044] In this embodiment, the pull rod 4 is threadedly connected and assembled with the lower guide rod 5 of the movable coil. In this way, the requirements for the installation sequence are more flexible, and the mounting seat 3 and the air spring 6 can be fixed first.

[0045] The fixed connection method not specifically specified in the present application is preferably a bolt connection.

[0046] The installation process and working principle of the present application are as follows: fix the pull rod to the guide rod under the moving coil by installing screws, then fix the mounting seat to the lower pole plate of the vibration table by screws, and then fix one end of the air spring to the mounting seat by installing screws. The center through hole of the force transmission guide rod is sleeved on the lower part of the pull rod, and is connected to the other end face of the air spring by screws, and the lower end of the pull rod is connected to the force transmission guide rod as a whole by a locking nut. The force transmission guide rod is guided by a linear motion bearing, and the linear motion bearing is installed on the bearing mounting seat through a bearing cover, and the bearing mounting seat is fixed to the mounting seat by screws. In this way, when the air spring is inflated and deflated, the force transmission guide rod and the pull rod will move along the direction of the force transmission guide rod, thereby pulling the guide under the moving coil to move, so as to achieve the purpose of adjusting the position of the moving coil. In order to achieve the centering of the moving coil position under low air pressure, the following instructions are given:

[0047] First, according to the lower limit value P of low pressure in the test conditions minThe maximum suction force F on the upper end of the dynamic coil in a low pressure environment is calculated p , the calculation formula is as follows:

[0048] ,

[0049] Among them, S0 is the effective force-bearing area of ​​the moving coil in the low-pressure box; P0 is the atmospheric pressure of the ambient location.

[0050] Then, before the test begins, open the stop valve and let the high-pressure gas from the compressed air source pass through the air pipe to charge the air spring. After charging, close the stop valve so that the charging pressure is , the calculation formula is as follows:

[0051]

[0052] Among them, S1 is the effective force area of ​​the air spring.

[0053] In this way, the dynamic coil is always subjected to a downward force under the action of the air spring, which is greater than or equal to the maximum suction force received by the dynamic coil during the test, so that the dynamic coil is subjected to a combined force downward in the direction of gravity under the gravity of the load during the entire test process. Therefore, the dynamic coil position adjustment device (central air chamber or independently installed air spring) of the ordinary vibration table only needs to maintain positive pressure to balance the downward combined force, so that no additional negative pressure source is required.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A moving coil position adjustment device, placed on a vibration table body (1), the vibration table body (1) includes a vibration table lower plate (2), characterized in that: The moving coil position adjustment device comprises: A pull rod (4); a first end of the pull rod (4) is fixed on a guide rod (5) below the moving coil; An air spring (6); a first action end of the air spring (6) is fixed on the lower plate (2) of the vibration table; the first action end of the air spring (6) is arranged close to the lower guide rod (5) of the moving coil; A force transmission guide rod (7); the force transmission guide rod (7) is connected to the second action end of the air spring (6); the second end of the pull rod (4) is connected to the force transmission guide rod (7), and the air spring (6) is placed between the lower plate (2) of the vibration table and the force transmission guide rod (7); The adjustment method of the dynamic coil position adjustment device is as follows: by inflating the air spring, the force transmission guide rod and the pull rod move downward, so that the dynamic coil is subjected to a downward pulling force greater than or equal to the suction force received by the upper end of the dynamic coil in the low-pressure box, and by presetting a fixed downward pulling force for the dynamic coil, the air pressure of the sealed air chamber inside the vibration table is always greater than the standard atmospheric pressure; According to the lower limit of low pressure P in the test conditions min The maximum suction force F on the upper end of the dynamic coil in a low pressure environment is calculated p , the calculation formula is as follows: ， Among them, S0 is the effective force-bearing area of ​​the moving coil in the low-pressure box; P0 is the atmospheric pressure of the environment; Then, before the test begins, open the stop valve and let the high-pressure gas from the compressed air source pass through the air pipe to charge the air spring. After charging, close the stop valve so that the charging pressure is , the calculation formula is as follows: ， Among them, S1 is the effective force area of ​​the air spring.

2. A moving coil position adjustment device according to claim 1, characterized in that: The moving coil position adjustment device also includes a compressed air source (9) and an air pipe (10), and the compressed air source (9) is connected to the air spring (6) through the air pipe (10).

3. A moving coil position adjustment device according to claim 2, characterized in that: A stop valve (8) is provided on the air pipe (10).

4. A moving coil position adjustment device according to claim 2, characterized in that: A pressure reducing valve is arranged on the air pipe (10).

5. The moving coil position adjustment device according to claim 1, characterized in that: A through hole is provided in the force transmission guide rod (7), a section of the pull rod (4) has a diameter larger than the through hole, and another section of the pull rod (4) has a diameter slightly smaller than the through hole. An external thread is provided at the second end of the pull rod (4), and the small diameter section of the pull rod (4) passes through the through hole and is locked by a locking nut (13) after passing out.

6. A moving coil position adjustment device according to any one of claims 1 to 5, characterized in that: The dynamic coil position adjustment device also includes a mounting seat (3); the mounting seat (3) is formed into a structure with a groove, and the mounting seat (3) is fixed on the lower pole plate (2) of the vibration table; the groove of the mounting seat (3) is embedded in the opening of the lower pole plate (2) of the vibration table, the air spring (6) is placed in the groove, and the first action end of the air spring (6) is fixed at the bottom of the groove, and the pull rod (4) is arranged through the groove.

7. A moving coil position adjustment device according to claim 6, characterized in that: The moving coil position adjustment device also includes a bearing mounting seat (11) and a linear motion bearing (14). The bearing mounting seat (11) is fixedly mounted on the mounting seat (3), the linear motion bearing (14) is mounted on the bearing mounting seat (11), the force transmission guide rod (7) is installed through the linear motion bearing (14), and the linear motion bearing (14) is used to support and guide the force transmission guide rod (7).

8. The moving coil position adjustment device according to claim 1, characterized in that: An internal threaded hole is provided at the end of the lower guide rod (5) of the moving coil, an external thread is provided on the first end of the pull rod (4), and the first end of the pull rod (4) is threadedly connected to the end of the lower guide rod (5) of the moving coil.

Images