Supporting mechanism and gravity unloading device

Abstract

The utility model relates to the technical field of installation and debugging of large optical elements, and provides a supporting mechanism which comprises a supporting base, an adjusting lead screw is rotationally arranged on the supporting base, the adjusting lead screw is connected with a driving assembly, an adjusting seat is matched with the adjusting lead screw through threads, and a limiting piece used for limiting rotation of the adjusting seat is arranged on the supporting base. A supporting assembly used for supporting an optical element is arranged above the adjusting base, the driving assembly comprises a first gear, a second gear, a transmission shaft and a driving motor, the transmission shaft is rotationally arranged on the supporting base and is parallel to the adjusting lead screw, the first gear is fixedly arranged at the lower end of the adjusting lead screw, and the second gear is fixedly arranged at the lower end of the transmission shaft. The driving motor is arranged above the supporting base and connected with the transmission shaft. The supporting mechanism is prevented from being too large in length size, and the supporting mechanism can be conveniently used in occasions with small installation space height.

Description

Technical Field

[0001] The utility model relates to the technical field of installation and debugging of large optical elements, and particularly relates to a support mechanism and a gravity unloading device. Background Technique

[0002] In order to ensure the consistency of the sky and ground performance of a large-aperture space camera, before it is launched into the space orbit, it usually simulates the mechanical state similar to the orbital state of the space camera during the ground verification (i.e., the ground installation, adjustment and testing process). The core of the ground verification is gravity unloading. The purpose of "gravity unloading" is not to "cancel" the load, but to separate the influence of gravity through some means and obtain a reliable zero-gravity surface shape of the mirror during the ground installation and detection.

[0003] At present, the multi-point support method is flexible, stable and reliable, and is a relatively common gravity unloading method. The support mechanism of multi-point support is the key of this method. In the prior art, for example, the support mechanism and gravity unloading device with the publication number of "CN219013887U" applied by the applicant realizes the precise adjustment of the support force through the mutual cooperation of structures such as force sensors, driving motors, and adjusting lead screws, and avoids damage to optical elements caused by misoperation. However, there are at least the following defects in this technical solution. The adjusting lead screw is driven by a motor connected to its bottom, which will cause the length dimension of the support mechanism to be too large and has certain limitations when used in occasions with a small installation space height. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a support mechanism and a gravity unloading device to solve the above problems of the prior art.

[0005] The utility model is realized through the following technical solutions:

[0006] A support mechanism includes a support base, an adjusting lead screw is rotatably arranged on the support base, the adjusting lead screw is connected with a driving component, an adjusting seat is in threaded cooperation with the adjusting lead screw, a limiting member for restricting the rotation of the adjusting seat is arranged on the support base, a support component for supporting an optical element is arranged above the adjusting seat, the driving component includes a first gear, a second gear, a transmission shaft and a driving motor, the transmission shaft is rotatably arranged on the support base and is parallel to the adjusting lead screw, the first gear is fixedly arranged at the lower end of the adjusting lead screw, the second gear is fixedly arranged at the lower end of the transmission shaft, and the driving motor is arranged above the support base and is connected with the transmission shaft.

[0007] Optionally, the driving component further includes a worm gear and a worm, the worm gear is fixedly arranged at the upper end of the transmission shaft, the worm is rotatably arranged above the support base and meshes with the worm gear, and the driving motor is connected with the worm.

[0008] Optionally, the support assembly includes a connecting shaft, a support plate and a force sensor. A housing is fixedly connected to the support base. The connecting shaft is slidably connected to the inner wall of the housing, and an elastic member is provided between the connecting shaft and the top of the adjusting seat. One end of the force sensor is connected to the support plate, and the other end of the force sensor is connected to the connecting shaft.

[0009] Optionally, a connecting seat is fixedly connected to the end of the force sensor close to the support plate, and the support plate and the connecting seat are connected by a spherical plain bearing.

[0010] Optionally, a plurality of connecting through holes are provided on the adjusting seat, connecting threaded holes are provided at corresponding positions on the connecting shaft, and a tension screw is connected between the connecting through holes and the connecting threaded holes.

[0011] Optionally, the limiting member is provided with a guiding surface, and the adjusting seat is provided with an abutting surface that abuts against the guiding surface.

[0012] Optionally, a limiting seat is fixedly connected to the support base. An upper travel switch is provided at the upper end of the limiting seat, a lower travel switch is provided at the lower end of the limiting seat, and a limiting piece for triggering the upper travel switch and the lower travel switch is fixedly connected to the adjusting seat.

[0013] The present utility model also provides a gravity unloading device, which includes several support mechanisms as described in any one of the above.

[0014] The technical solution of the present utility model has at least the following advantages and beneficial effects: In the present utility model, the mechanism of the driving assembly is changed, and a first gear, a second gear and a transmission shaft are added, so that the driving motor does not occupy the lower space of the support base, but shares the upper space of the support seat, avoiding the excessive length dimension of the support mechanism and facilitating the use in occasions with a small installation space height. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0016] Figure 1 Structural schematic diagram of a support mechanism provided by the present utility model Figure 1 (Hidden cover plate);

[0017] Figure 2 Structural schematic diagram of a support mechanism provided by the present utility model Figure 2 (Hidden protective box);

[0018] Figure 3 Top view of a support mechanism provided by the present utility model (hiding the driving assembly);

[0019] Figure 4 is Figure 3 the A-A sectional view of;

[0020] Figure 5 is Figure 4 the schematic diagram of the B-B sectional view rotation of;

[0021] Icon: 1 - support base, 2 - adjusting screw rod, 3 - adjusting seat, 4 - limiting part, 5 - driving component, 501 - first gear, 502 - second gear, 503 - transmission shaft, 504 - driving motor, 505 - worm gear, 506 - worm, 6 - connecting shaft, 7 - support plate, 8 - force sensor, 9 - spherical plain bearing, 10 - connecting seat, 11 - housing, 12 - limiting seat, 13 - limiting piece, 14 - upper travel switch, 15 - lower travel switch, 16 - linear bearing, 17 - tension screw, 18 - cover plate, 19 - protective box, 20 - elastic part. Detailed implementation manners

[0022] Embodiment 1

[0023] Refer to Figures 1-5 , a support mechanism, including a support base 1, an adjusting screw rod 2 is rotatably arranged on the support base 1, the adjusting screw rod 2 is connected with a driving component 5, the driving component 5 includes a first gear 501, a second gear 502, a transmission shaft 503 and a driving motor 504, the transmission shaft 503 is rotatably arranged on the support base 1 and is parallel to the adjusting screw rod 2, the first gear 501 is fixedly arranged at the lower end of the adjusting screw rod 2, the second gear 502 is fixedly arranged at the lower end of the transmission shaft 503, the driving motor 504 is arranged above the support base 1 and is connected with the transmission shaft 503. In this way, the driving motor 504 does not occupy the lower space of the support base 1, but shares the upper space of the support base, avoiding the over-large length dimension of the support mechanism and facilitating the use in the occasion with a small installation space height.

[0024] Furthermore, the driving component 5 further includes a worm gear 505 and a worm 506, the worm gear 505 is fixedly arranged at the upper end of the transmission shaft 503, the worm 506 is rotatably arranged above the support base 1 and meshes with the worm gear 505, the driving motor 504 is connected with the worm 506. It should be noted that, with such an arrangement, the self-locking characteristic of the worm gear 505 and worm 506 transmission is utilized to realize the self-locking of the adjusting screw rod 2.

[0025] In practical applications, a groove is arranged at the bottom of the support base 1, the first gear 501 and the second gear 502 are arranged in the groove, the groove is closed by a cover plate 18, the worm gear 505 and the worm 506 are covered by a protective box 19, and the protective box 19 plays a protective role.

[0026] A regulating lead screw 2 is threadedly engaged with a regulating seat 3. A limiting member 4 for restricting the rotation of the regulating seat 3 is provided on the support base 1. The limiting member 4 restricts the rotation of the regulating seat 3 in the following manner. The limiting member 4 is provided with a guiding surface, and the regulating seat 3 is provided with an abutting surface that abuts against the guiding surface. The regulating seat 3 can only move up and down along the guiding surface and cannot rotate.

[0027] Above the regulating seat 3, there is a support assembly for supporting the optical element. Specifically, the support assembly includes a connecting shaft 6, a support plate 7, and a force sensor 8. A housing 11 is fixedly connected to the support base 1. The connecting shaft 6 is slidably connected to the inner wall of the housing 11. In practical applications, a linear bearing 16 is provided between the housing 11 and the connecting shaft 6 and is fixedly connected to the housing 11 to ensure smooth sliding of the connecting shaft 6. An elastic member 20 is provided between the top of the connecting shaft 6 and the regulating seat 3. One end of the force sensor 8 is connected to the support plate 7, and the other end of the force sensor 8 is connected to the connecting shaft 6. During use, by rotating the regulating lead screw 2, the regulating seat 3 is driven to move up and down, thereby changing the force with which the regulating seat 3 presses the elastic member 20, and further adjusting the supporting force of the support point.

[0028] The regulating seat 3 is provided with a number of connecting through holes, and corresponding connecting threaded holes are provided on the connecting shaft 6. A tensioning screw 17 is connected between the connecting through hole and the connecting threaded hole. It should be noted that this setting facilitates the downward movement of the connecting shaft 6 following the regulating seat 3. At the same time, the connecting shaft 6 and the regulating seat 3 can approach each other by a certain distance without affecting the compression of the elastic member 20. The elastic member 20 is not limited, for example, a spring, elastic rubber, etc. can be used.

[0029] A limit seat 12 is fixedly connected to the support base 1. An upper travel switch 14 is provided at the upper end of the limit seat 12, and a lower travel switch 15 is provided at the lower end of the limit seat 12. The regulating seat 3 is fixedly connected with a limit piece 13 for triggering the upper travel switch 14 and the lower travel switch 15. When the regulating seat 3 moves to the lowest end, the lower travel switch 15 can abut against the bottom of the limit piece 13, and the lower travel switch 15 is triggered, facilitating knowing that this is the minimum value of the supporting force at this time. When the regulating seat 3 moves to the uppermost end, the upper travel switch 14 can abut against the top of the limit piece 13, and the upper travel switch 14 is triggered, facilitating knowing that this is the maximum value of the supporting force at this time. At this time, the driving motor 504 can be stopped to avoid damaging the optical element. It should be noted that in this embodiment, the limit seat 12 is arranged outside the housing 11. Compared with the prior art, it avoids the increase in the length dimension caused by arranging the limit seat 12 inside the housing 11. In addition, the regulating seat 3 abuts against the lower end of the linear bearing 16 to form a mechanical limit, achieving double protection.

[0030] In this embodiment, one end of the force sensor 8 close to the support plate 7 is fixedly connected to the connecting seat 10, and the support plate 7 and the connecting seat 10 are connected by a spherical plain bearing 9. With this arrangement, the support plate 7 can rotate in any direction within a certain angle range, facilitating better fitting of the support plate 7 with the supported surface of the optical element.

[0031] Embodiment 2

[0032] The present utility model also provides a gravity unloading device, which includes a plurality of support mechanisms provided in Embodiment 1. In practical applications, the positions of the support mechanisms are set according to the positions of the support points of the optical element, and the support forces of each support point are adjusted by the support mechanisms as required.

[0033] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A support mechanism, comprising a support base, an adjusting screw is rotatably provided on the support base, the adjusting screw is connected to a driving assembly, an adjusting seat is threadedly engaged with the adjusting screw, a stopper for limiting the rotation of the adjusting seat is provided on the support base, and a support assembly for supporting an optical element is provided above the adjusting seat, characterized in that: The driving assembly includes a first gear, a second gear, a transmission shaft and a driving motor. The transmission shaft is rotatably arranged on the support base and is parallel to the adjusting screw rod. The first gear is fixed to the lower end of the adjusting screw rod, and the second gear is fixed to the lower end of the transmission shaft. The driving motor is arranged above the support base and connected to the transmission shaft.

2. The support mechanism according to claim 1, characterized in that: The driving assembly also includes a worm wheel and a worm. The worm wheel is fixedly arranged at the upper end of the transmission shaft. The worm is rotatably arranged above the supporting base and meshes with the worm wheel. The driving motor is connected to the worm.

3. The support mechanism according to claim 1, characterized in that: The support assembly includes a connecting shaft, a supporting plate and a force sensor. The supporting base is fixedly connected to a shell. The connecting shaft is slidably connected to the inner wall of the shell. An elastic part is provided between the connecting shaft and the top of the adjusting seat. One end of the force sensor is connected to the supporting plate, and the other end of the force sensor is connected to the connecting shaft.

4. The support mechanism according to claim 3, characterized in that: One end of the force sensor close to the supporting plate is fixedly connected to the connecting seat, and the supporting plate and the connecting seat are connected through a joint bearing.

5. The support mechanism according to claim 3, characterized in that: The adjusting seat is provided with a plurality of connecting through holes, corresponding positions on the connecting shaft are provided with connecting threaded holes, and a tensioning screw is connected between the connecting through holes and the connecting threaded holes.

6. The support mechanism according to any one of claims 1 to 5, characterized in that: The limiting member is provided with a guide surface, and the adjusting seat is provided with an abutting surface abutting against the guide surface.

7. The support mechanism according to any one of claims 1 to 5, characterized in that: A limit seat is fixedly connected to the support base, an upper travel switch is arranged at the upper end of the limit seat, a lower travel switch is arranged at the lower end of the limit seat, and a limit plate for triggering the upper travel switch and the lower travel switch is fixedly connected to the adjustment seat.

8. A gravity unloading device, characterized in that: The invention comprises the supporting mechanism described in any one of claims 1 to 7.

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