CN115268011B - Gravity unloading device for reflector - Google Patents

Abstract

The invention relates to the technical field of vacuum gravity unloading, and specifically provides a gravity unloading device for a reflector, including: a force sensor, a top seat assembly, a mandrel assembly, a bracket, a threaded pressure rod and a weight group, the force sensor and the back of the reflector Fitting, the force sensor is fixed on the top seat assembly, the top seat assembly is connected with the ejector rod assembly, the ejector rod assembly is used to bring the force sensor and the top seat assembly to apply force to the reflector, and the bracket is the fixing part of the gravity unloading device of the reflector , and provide an external installation interface, the threaded pressure rod and weight assembly realize the change of gravity unloading force through the principle of leverage. The invention is applied to the field of vertical detection of the optical axis of the reflector. It does not need to be assembled together with the reflector. It is an independent device, which reduces the complicated work such as the assembly and adjustment of the reflector. It adopts a purely mechanical structure and is suitable for vacuum and other complex environments. It has the advantages of high space utilization, small size, convenient movement and simple operation.

Description

Gravity unloading device for mirrors

technical field

The invention relates to the technical field of vacuum gravity unloading, and specifically provides a gravity unloading device suitable for reflecting mirrors in a vacuum environment.

Background technique

With the trend of space remote sensors developing towards large apertures, the apertures of reflectors are getting larger and higher, and the accuracy requirements are getting higher and higher. The influence of gravity and air disturbance on the detection of reflectors is becoming more and more obvious. In order to eliminate the factors of gravity and air disturbance The influence of large-aperture mirrors requires a gravity unloading device that can be used for detection in a vacuum environment.

The existing mirror gravity unloading device is mainly driven by air pressure or hydraulic pressure, and is used in the processing, grinding and testing stages of the mirror, but this device cannot be used in a vacuum environment.

Several existing gravity unloading devices that can be used in a vacuum environment mainly include the following disadvantages:

1. A gravity unloading device supported by a mercury belt is used, but the unloading force of this device is uneven, and it is easy to introduce new stress deformation of the mirror.

2. The gravity unloading device combined with a mercury belt and a pulley is adopted, but this device is bulky, and it is a device that utilizes the gravity self-unloading of the reflector. The friction of the mechanism is not considered, and the accuracy of gravity unloading is poor.

3. A gravity unloading device with a horizontal optical axis needs to detect at least two states, and the detection time is long.

4. The gravity unloading device is assembled with the reflector, the device has strong coupling, and the installation and adjustment are complicated.

Contents of the invention

In order to solve the above problems, the present invention provides a gravity unloading device for the reflecting mirror, which realizes the gravity unloading of the reflecting mirror through a mechanical structure, so as to ensure that the present invention can work in a vacuum environment.

The gravity unloading device of the reflector provided by the present invention includes: a force sensor, a top seat assembly, a push rod assembly, a bracket, a threaded pressing rod and a weight assembly;

The force sensor is fixed on the top seat assembly;

The ejector rod assembly includes an upper sliding rod, an upper sliding seat, a connecting frame, a connecting piece, a lower sliding rod and a lower sliding seat;

The upper sliding seat is installed on the upper end of the bracket, the upper sliding rod passes through the upper sliding seat, the upper end of the upper sliding rod is connected with the top seat assembly through rotation, the lower end of the upper sliding rod is fixedly connected to the upper part of the connecting frame; the upper end of the lower sliding rod is fixed Connected to the lower part of the connecting frame, the connecting piece is fixed in the connecting frame through a rotating shaft; the lower end of the lower sliding rod passes through the lower sliding seat, and the lower sliding seat is fixedly connected to the lower end of the bracket;

The threaded pressure rod includes a threaded section and an optical axis section, the optical axis section is rotatably connected to the support through a fulcrum shaft, and the end of the optical axis section is rotatably connected to the connecting frame and the connecting piece through a rotating shaft.

Preferably, the lower end of the bracket is provided with lugs, and fixing holes are opened on the lugs for fixing the gravity unloading device of the reflector.

Preferably, the counterweight is detachable and replaceable.

Preferably, the weight assembly includes a threaded mandrel and a counterweight; the threaded mandrel is threadedly engaged with the threaded pressing rod.

Preferably, the top seat assembly includes a top seat bearing seat, a top seat bearing, a top seat bearing pressure ring and a top seat bearing collar, and the top seat bearing is fixedly connected in the top seat bearing seat through the top seat bearing pressure ring, and passes through the top seat The upper end of the upper sliding rod is fixedly connected with the top seat bearing by the bearing collar.

Compared with the prior art, the present invention can achieve the following beneficial effects:

1. The present invention adopts a purely mechanical structure and is suitable for vacuum and other complex environments.

2. The present invention has high space utilization rate, small volume, convenient movement and simple operation.

3. The application of the present invention in the field of vertical detection of the optical axis of the reflector does not need to be assembled with the reflector, and is an independent device, which reduces complex work such as the assembly and adjustment of the reflector.

Description of drawings

Fig. 1 is a schematic structural view of a gravity unloading device for a reflector according to an embodiment of the present invention;

Fig. 2 is a cross-sectional view of a top seat assembly provided according to an embodiment of the present invention;

3 is a cross-sectional view of a side view of a gravity unloading device for a reflector according to an embodiment of the present invention;

4 is a front view of a gravity unloading device for a reflector according to an embodiment of the present invention;

Fig. 5 is a cross-sectional view of a threaded plunger and a weight assembly provided according to an embodiment of the present invention;

Figure 6 is a schematic diagram of an alternative structure provided in accordance with the present invention.

The reference numerals among Fig. 1～Fig. 5 include:

Force sensor 1, top seat assembly 2, top seat bearing seat 21, top seat bearing 22, top seat bearing pressure ring 23, top seat bearing collar 24, ejector rod assembly 3, upper sliding rod 31, upper sliding seat 32, connection Frame 33, connector 34, lower sliding rod 35, lower sliding seat 36, connecting shaft 37, support 4, threaded pressure rod 5, weight assembly 6, threaded mandrel 61, counterweight 62, weight bearing seat 63, Weight ball bearing 64, weight bearing pressure ring 65, weight bearing collar 66, fulcrum shaft 7, lug 8;

Reference numerals in Fig. 6 include:

The fork structure is 5 ' , and the external connecting piece is 34 ' .

detailed description

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same blocks are denoted by the same reference numerals. With the same reference numerals, their names and functions are also the same. Therefore, its detailed description will not be repeated.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

Fig. 1 shows the structure of a gravity unloading device for a reflector according to an embodiment of the present invention.

As shown in FIG. 1 , the gravitational unloading device of the reflector includes: a force sensor 1 , a top seat assembly 2 , a push rod assembly 3 , a bracket 4 , a threaded pressing rod 5 , a weight assembly 6 and a fulcrum shaft 7 .

The force sensor 1 is attached to the back of the reflector, the force sensor 1 is fixed on the top seat assembly 2, the top seat assembly 2 is connected with the ejector rod assembly 3, and the ejector rod assembly 3 is used to drive the force sensor 1 and the top seat assembly 2 to reflect The force is exerted by the mirror, and the design of the ejector rod assembly 3 through double sliding rods ensures the stability of the gravity unloading device of the reflector, and ensures the linear movement of the ejector rod assembly 3 up and down, thereby ensuring the force of the gravity unloading device of the reflector. The directionality of the output.

Bracket 4 is the fixing part of the gravity unloading device of the reflector, and provides an external installation interface. An ear piece 8 is provided at the lower end of the bracket 4, and the gravity unloading device of the reflector is fixed on the application scene by bolts. The middle position of the bracket 4 is provided with a The through hole is used to connect the fulcrum shaft 7 .

The threaded pressure rod 5 includes a threaded section and an optical axis section. The optical axis section on the threaded pressure rod 5 is provided with a first through hole and a second through hole. The components 6 are threadedly engaged to adjust the position of the weight component 6, and realize the change of gravity unloading force through the principle of leverage.

Fig. 2 shows a cross-sectional structure of a top seat assembly provided according to an embodiment of the present invention.

As shown in FIG. 2 , the top seat assembly 2 includes a top seat bearing seat 21 , a top seat bearing 22 , a top seat bearing pressure ring 23 and a top seat bearing collar 24 , and the top seat bearing 22 can be a ball bearing or a self-aligning bearing. The top seat bearing 22 is fixedly connected in the top seat bearing seat 21 through the top seat bearing pressure ring 23, and the upper end of the upper sliding rod 31 is fixedly connected with the top seat bearing 22 through the top seat bearing collar 24, and the top seat bearing 22 ensures Between the force sensor 1 and the reflector there is only a force or pressure along the normal direction of the contact surface, which ensures that the gravity unloading mechanism of the reflector will not have new stress effects on the reflector.

Fig. 3 shows a cross-sectional structure of a side surface of a gravity unloading device for a reflector according to an embodiment of the present invention.

Fig. 4 shows the front structure of the gravity unloading device for the reflector according to the embodiment of the present invention.

As shown in Fig. 3 and Fig. 4, the push rod assembly 3 includes an upper sliding rod 31, an upper sliding seat 32, a connecting frame 33, a connector 34, a lower sliding rod 35, a lower sliding seat 36 and a connecting shaft 37, and the upper sliding seat 32 And lower sliding seat 36 can adopt linear bearing, self-lubricating copper sleeve or polytetrafluoroethylene sleeve. The upper sliding rod 31 passes through the upper sliding seat 32 , and the upper sliding seat 32 is fixed in the slot provided at the upper end of the bracket 4 . The upper end of the upper slide bar 31 is connected with the top seat assembly 2 by the top seat bearing 22, and the lower end of the upper slide bar 31 is fixedly connected to the top of the connecting frame 33; The bottom of the connecting frame 33 is provided with a pair of through holes, and the connecting shaft 37 passes through the pair of through holes, and the connector 34 is connected with the connecting frame 33 through the connecting shaft 37; the lower end of the lower sliding rod 35 passes through the lower sliding seat 36, and the lower sliding seat 36 It is fixed in the inverted draw-in groove provided at the bottom of the bracket 4 .

The lower part of the bracket 4 has an inverted slot for connecting the lower sliding seat 36 of the ejector rod assembly 3 ; the upper part of the bracket 4 has an upright slot for connecting the upper sliding seat 32 of the ejector rod assembly 3 . A through hole is opened in the middle of the bracket 4 , the fulcrum shaft 7 passes through the through hole and the second through hole on the threaded pressure rod 5 , and the first through hole is used for connecting with the connecting piece 34 .

Fig. 5 shows a cross-sectional structure of a threaded pressing rod and a weight assembly provided according to an embodiment of the present invention.

As shown in FIG. 5 , the weight assembly 6 includes: a threaded mandrel 61 , a counterweight 62 , a weight bearing seat 63 , a weight ball bearing 64 , a weight bearing pressure ring 65 and a weight bearing collar 66 .

The weight ball bearing 64 is fixed in the weight bearing seat 63 through the weight bearing pressure ring 65, the weight ball bearing 64 is fixedly connected with the threaded mandrel 61 through the weight bearing collar 66, and the counterweight 62 is connected through threads At the bottom of the weight bearing seat 63, the counterweight 62 can be disassembled, replaced and installed by unscrewing and tightening the thread. The threaded pressing rod 5 is connected to the weight assembly 6 through the threaded mandrel 61 , and the threaded mandrel 61 and the threaded pressing rod 5 are threadedly engaged, and the weight assembly 6 as a whole moves linearly along the threaded pressing rod 5 by rotating the threaded mandrel 61 .

During use, the lever principle and force transmission are described as follows: the weight assembly 6 pulls the threaded pressure rod 5 due to gravity, and the threaded pressure rod 5 rotates under the action of the fulcrum shaft 7 and the weight assembly 6, and the threaded pressure rod 5 and One end of the connecting piece 34 will generate an upward pulling force, and the pulling force will be transmitted to the connecting piece 34. Under the restriction of the connecting shaft 37, the upper sliding rod 31 and the lower sliding rod 35, the push rod assembly 3 will convert the transmitted pulling force into an upward pushing force. Force to force transducer 1 and top seat assembly 2. By rotating the threaded mandrel 61, the position of the weight assembly 6 on the threaded pressure rod 5 is adjusted, so that the output force of the present invention reaches the expected size, and the force output capability of the present invention can be further improved by replacing the counterweight 62.

It should be noted that the fulcrum shaft 7 and the connecting shaft 37 in the present invention can be designed as a shafting structure for installing bearings through the through holes of the fulcrum shaft 7 and the connecting shaft 37. This design has smaller rotational resistance.

It should be noted that Fig. 6 is an alternative structure provided according to the present invention. As shown in Fig. 6, in the alternative structure of the present invention, the upper sliding rod 31, the connecting frame 33 and the lower sliding rod 35 can be replaced by an optical axis structure, The connecting piece 34 is replaced by a larger external connecting piece 34 ′ , which is connected to the outside of the optical axis, the threaded pressure rod 5 is replaced by a shift fork structure 5 ′ , and the shift fork structure 5 ′ is connected to the bracket 4 and the outer Set connectors to connect. The other parts of this replacement structure are the same as the mechanical structure and working process in the embodiment, and will not be repeated here. This alternative structure is the same as the mechanism of the gravitational unloading device for the mirror in the embodiment.

The invention has been applied to the vacuum detection of the radiation mirror of the space remote sensing camera, and the working condition is good, and all indexes can meet the use requirements.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations on the present invention. Those skilled in the art can make changes, modifications, substitutions and modifications to the above-mentioned embodiments within the scope of the present invention.

The specific implementation manners of the present invention above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (4)

1. A gravity unloading apparatus for a mirror, comprising: the device comprises a force sensor, a top seat component, a top rod component, a support, a threaded pressure rod and a weight component;

the force sensor is fixed on the top seat assembly, the top seat assembly comprises a top seat bearing block, a top seat bearing pressing ring and a top seat bearing clamping ring, the top seat bearing is fixedly connected in the top seat bearing block through the top seat bearing pressing ring, and the upper end of the upper sliding rod is fixedly connected with the top seat bearing through the top seat bearing clamping ring;

the ejector rod assembly comprises an upper sliding rod, an upper sliding seat, a connecting frame, a connecting piece, a lower sliding rod, a lower sliding seat and a connecting shaft;

the upper sliding seat is mounted at the upper end of the support, the upper sliding rod penetrates through the upper sliding seat, the upper end of the upper sliding rod is rotatably connected with the top seat assembly, and the lower end of the upper sliding rod is fixedly connected to the upper part of the connecting frame; the upper end of the lower sliding rod is fixedly connected to the lower part of the connecting frame, and the lower end of the connecting piece is fixed in the connecting frame through the connecting shaft; the lower end of the lower sliding rod penetrates through the lower sliding seat, and the lower sliding seat is fixedly connected to the lower end of the support;

the threaded compression bar comprises a threaded section and an optical axis section, a through hole is formed in the middle of the support, the fulcrum shaft penetrates through the through hole to be connected to the support, the optical axis section is rotatably connected with the support through the fulcrum shaft, and the end of the optical axis section is rotatably connected with the connecting frame and the connecting piece through a rotating shaft.

2. The gravity unloading device for reflector mirrors as claimed in claim 1, wherein the lower end of the bracket is provided with a lug, and the lug is provided with a fixing hole for fixing the gravity unloading device for reflector mirrors.

3. The mirror gravity unloading device of claim 1, wherein the weight assembly comprises a threaded spindle and a counterweight; the threaded mandrel is in threaded engagement with the threaded pressure rod.

4. The gravity unloading apparatus for mirrors of claim 3, wherein said weight is removable and replaceable.

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