CN110579856B - Decoupling device for wide field telescopes - Google Patents

Abstract

The invention relates to a decoupling device for a large-field telescope, which comprises a shell, a coupling mechanism and a coupling mechanism, wherein an elastic piece is accommodated in the shell, a top cover is arranged at the top of the elastic piece, and a cavity is formed by the top cover and the shell; the top of the shell is provided with an opening; the rolling support assembly is arranged above the top cover and positioned in the cavity, and comprises a support frame and a ball group arranged in the support frame; the flexible hinge assembly is used for supporting the primary mirror and comprises a flexible hinge and a movable plate connected to the bottom of the flexible hinge, the flexible hinge penetrates through an opening of the shell, the movable plate is arranged on the rolling support assembly, the width of the cavity is larger than the length of the movable plate, and the movable plate can horizontally move in the cavity in a left-right mode. The decoupling device is suitable for the condition that the primary mirror needs to have larger transverse displacement in a telescope, and is compatible with an overload protection function.

Description

Decoupling device for wide field telescopes

technical field

The invention relates to the technical field of telescopes, in particular to a decoupling device for a large field of view telescope.

Background technique

In recent years, with the gradual development of domestic telescope technology, while pursuing high resolution, high search speed has also become the research goal of scientific researchers, and large-diameter and large-field telescopes have emerged as the times require. Large-diameter and large-field telescopes put forward new requirements for the main mirror support technology, that is, in addition to meeting the axial support of the main mirror in a non-interference environment, when the main mirror is subjected to overload stress due to earthquakes, wind loads, etc., the axial support The mechanism has overload protection function; in addition, in order to cooperate with the design of large diameter and large field of view, the axial support needs to allow the lateral displacement of the main mirror in the order of millimeters under the condition of ensuring support, and the traditional flexible rod axial support cannot meet the requirements. . Therefore, it is necessary to redesign the axial support of large-aperture and large-field telescopes.

SUMMARY OF THE INVENTION

The main technical problem to be solved by the present invention is to provide a decoupling device for a telescope with a large field of view, which is suitable for the situation that the main mirror has a large lateral displacement in the telescope and is compatible with the overload protection function.

In order to solve the above-mentioned technical problems, a technical scheme adopted in the present invention is:

A decoupling device for a wide field telescope, comprising:

a casing, an elastic piece is accommodated in the casing, a top cover is provided on the top of the elastic piece, and the top cover and the casing form a cavity; the top of the casing is provided with an opening;

a rolling support assembly, disposed above the top cover and located in the cavity, the rolling support assembly includes a support frame and a ball group arranged in the support frame;

A flexible hinge assembly for supporting the main mirror, including a flexible hinge and a moving plate connected at the bottom of the flexible hinge, the flexible hinge passes through the opening of the casing, the moving plate is arranged on the rolling support assembly, and the width of the cavity is greater than The length of the moving plate, which can translate left and right in the cavity.

In one embodiment, the rolling support assembly includes a first rolling support assembly and a second rolling support assembly disposed up and down, and the moving plate is disposed between the first rolling support assembly and the second rolling support assembly.

In one embodiment, the casing includes a casing, an upper cover and a bottom cover respectively provided with two ends of the casing, and an upper baffle ring and a dish-shaped plate are arranged between the upper cover and the first rolling support assembly from bottom to top. The flexible hinge is inserted through the upper retaining ring and the disc spring.

In one embodiment, both the upper baffle ring and the first rolling support assembly are in interference fit with the inner hole wall formed by the upper cover, so that the upper baffle ring and the first rolling support assembly are fixed in the lateral direction inside the casing.

In one embodiment, the housing is provided with an oil-free bushing, the elastic member is arranged in the oil-free bushing and is in clearance fit with the oil-free bushing, and the oil-free bushing and the housing are in interference fit.

In one embodiment, the elastic member is a spring, the bottom of the housing is provided with a protrusion, and the protrusion is matched with the inner hole of the bottom of the spring.

In one embodiment, the diameter of the top cover is larger than the diameter of the opening, the spring is compressed and encapsulated in the casing, the compression amount of the pressed spring multiplied by the spring stiffness is the overload protection force value, and the compression amount is based on the oil-free bushing. Highly determinate.

In one embodiment, the casing includes a casing, an upper cover and a bottom cover respectively provided at two ends of the casing, and both the upper cover and the bottom cover are screwed with the casing.

In one embodiment, the plurality of balls of the ball group are evenly distributed on the support frame.

The beneficial effects of the present invention are: compared with the prior art, the present invention provides a decoupling device for a telescope with a large field of view, which is suitable for the situation in which the main mirror needs to have a large lateral displacement in the telescope, and is compatible with overload protection functions at the same time. . In addition, compared with the traditional simple flexible rod support, the use of the ball group makes the lateral displacement of the main mirror not only depends on the flexibility of the flexible rod, but also shortens the height of the main mirror support mechanism, making the entire mechanism more compact. Its overload protection function enables the main mirror to change from a rigid body to an elastic body when the main mirror is subjected to excessive external loads such as seismic wind loads, so as to avoid excessive stress on the main mirror, and the overload protection value can be adjusted according to the needs. set up.

Description of drawings

1 is a schematic half-section schematic diagram of a decoupling device for a wide-field telescope according to an embodiment;

2 is a schematic diagram of the connection position of a decoupling device for a wide-field telescope of an embodiment in a large-field telescope;

FIG. 3 is a schematic view of the size of a decoupling device for a large field of view telescope according to an embodiment.

Detailed ways

Referring to FIGS. 1 to 3 , the present invention provides a decoupling device 100 for a large field of view telescope, including a casing, a rolling support assembly accommodated in the casing, and a flexible hinge assembly passing through the casing, The flexible hinge assembly can be moved left and right (transverse direction movement) driven by the rolling support assembly.

Specifically, the decoupling device 100 includes a flexible hinge assembly 1 , a disc spring 2 , an upper cover 3 , an upper retaining ring 4 , a ball group 5 , a support frame 6 , a top cover 7 , an oil-free bushing 8 , an elastic member 9 , and a housing 10. Bottom cover 11.

The upper cover 3 and the bottom cover 11 are disposed at both ends of the casing 10 , and the three together form a casing. Specifically, the upper cover 3 and the bottom cover 11 are both screwed to the casing 10 . The upper cover 3 is provided with an opening in the middle, and the bottom cover 11 is provided with a protrusion. The elastic member 9 is accommodated in the casing, and two ends of the elastic member 9 are respectively abutted against the top cover 7 and the bottom cover 11 . Further, the elastic member 9 is a spring, the protrusion of the bottom cover 11 is matched with the inner hole of the bottom of the spring, the bottom of the top cover 7 is connected with the spring, the oil-free bushing 8 is arranged in the housing, and the top cover 7 is connected with the oil-free bushing. The sleeve 8 is a clearance fit, and the oil-free bushing 8 and the housing 10 are an interference fit. The diameter of the top cover 7 is larger than the diameter of the opening, and the spring is compressed and encapsulated in the casing. The compression amount of the pressed spring multiplied by the spring stiffness is the overload protection force value. The casing 10 and the top cover 7 and the upper cover 3 form a cavity, and the rolling support assembly is arranged on the top cover 7 and located in the cavity.

The flexible hinge assembly 1 includes a flexible hinge passing through the opening of the upper cover 3, and a moving plate connected to the bottom of the flexible hinge. Specifically, the diameter of the opening is greater than the diameter of the flexible hinge at the opening, the moving plate is located on the ball support assembly 6 and is accommodated in the cavity, the width of the cavity is greater than the length of the moving plate, and the moving plate can translate laterally in the cavity. Specifically, the difference between the width of the cavity and the length of the moving plate is the lateral movement range of the moving plate, that is, the lateral movement range of the flexible hinge assembly 1 .

Specifically, the rolling support assembly includes a first rolling support assembly and a second rolling support assembly arranged up and down. Both the first rolling support assembly and the second rolling support assembly include a support frame 6 and a ball group 5 arranged on the support frame 6. The balls The plurality of balls of the group 5 are evenly distributed on the support frame 6 . Further, the moving plate is disposed between the first rolling support assembly and the second rolling support assembly. The lower surface of the moving plate is in contact with the upper ball group 5 of the second rolling support assembly. The flexible hinge divides the first rolling support assembly into two parts, left and right, and the upper surface of the moving plate is in contact with the ball group 5 of the first rolling support assembly. When the moving plate moves left and right, it is driven by the ball group 5, so that it can move in the lateral direction. An upper stop ring 4 and a disc spring 2 are arranged between the upper cover 3 and the first rolling support assembly from bottom to top in sequence, and the flexible hinge passes through the upper stop ring 4 and the disc spring 2 . The upper retaining ring 4 plays a role of isolation, preventing the disc spring 2 from being directly stuck on the ball group 5, and restricting the ball group 5 from being on the balls on the support frame 6.

The dimensional relationship of the above-mentioned decoupling device is shown in FIG. 3 . Let the diameter of the top cover 7 be a1, the inner hole values of the casing 10 from top to bottom are b1 and b2, and the inner hole values of the upper cover 3 from top to bottom are respectively are c1 and c2, and the length of the moving plate of the flexible hinge assembly 1 is d1. The condition to be satisfied is that the diameter of the top cover 7 is a1>c1, so that the spring 9 is compressed and encapsulated into the housing 10, and the compression amount of the pressed spring multiplied by the spring stiffness is the overload protection force value. The amount of compression can be controlled by the housing 10 dimension L. The length d1 < b1 of the moving plate of the flexible hinge assembly 1 , and half of the difference between d1 and b1 is the lateral movement (left and right translation) range of the flexible hinge assembly 1 . The upper baffle ring 4 , the support frame 6 and the inner hole c2 of the upper cover 3 are in an interference fit, so that the upper baffle ring 4 and the support frame are fixed in the lateral direction inside the casing 10 .

The assembling method of the decoupling device is as follows: firstly, the oil-free bushing 8 is installed into the housing 10 , then the top cover 7 and the spring 9 are put in from below the housing 10 , and the bottom cover 11 is screwed to the housing 10 . At this time, the compression amount of the pressed spring multiplied by the stiffness of the spring is the overload protection value. Above the top cover 7 are the second rolling support assembly, the flexible hinge assembly 1, the first rolling support assembly, the upper stop ring 4, the disc spring 2, and finally the upper cover 3 is screwed to the housing 10. At this time, the disc spring 2 is used to compress the rolling support assembly, the flexible hinge assembly 1 and the rolling support assembly. As shown in Figure 2, the principle of action is that under normal circumstances, the decoupling device supports the main mirror. When the main mirror needs to move laterally, the flexible hinge assembly 1 can move along the lateral direction, and the moving distance is determined by the gap between the flexible hinge assembly 1 and the housing 10. It is determined that the flexible hinge assembly 1 utilizes elastic deformation to decouple the bending moment received by the primary mirror. When the main mirror is subjected to excessive external loads such as earthquake and wind load, that is, the spring preload protection value is exceeded, the main mirror can move downward with the flexible hinge assembly 1 and fall into the safety protection.

Compared with the prior art, the present invention provides a decoupling device for a telescope with a large field of view, which is suitable for the situation that the primary mirror in the telescope needs to have a large lateral displacement, and is compatible with the overload protection function. In addition, compared with the traditional simple flexible rod support, the use of the ball group makes the lateral displacement of the main mirror not only depends on the flexibility of the flexible rod, but also shortens the height of the main mirror support mechanism, making the entire mechanism more compact. Its overload protection function enables the main mirror to change from a rigid body to an elastic body when the main mirror is subjected to excessive external loads such as seismic wind loads, so as to avoid excessive stress on the main mirror, and the overload protection value can be adjusted according to the needs. set up.

The above are only the embodiments of the present invention, and are not intended to limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, All are similarly included in the scope of patent protection of the present invention.

Claims (5)

1. a decoupling device for a large field of view telescope, is characterized in that, comprising: a casing, an elastic piece is accommodated in the casing, a top cover is provided on the top of the elastic piece, and the top cover and the casing form a cavity; the top of the casing is provided with an opening; a rolling support assembly, disposed above the top cover and located in the cavity, the rolling support assembly includes a support frame and a ball group arranged in the support frame; A flexible hinge assembly for supporting the main mirror, including a flexible hinge and a moving plate connected at the bottom of the flexible hinge, the flexible hinge passes through the opening of the casing, the moving plate is arranged on the rolling support assembly, and the width of the cavity is greater than the length of the moving plate, which can translate left and right in the cavity; The rolling support assembly includes a first rolling support assembly and a second rolling support assembly arranged up and down, the moving plate is disposed between the first rolling support assembly and the second rolling support assembly; an oil-free bushing is arranged in the housing , the elastic member is arranged in the oil-free bushing and is in clearance fit with the oil-free bushing, and the oil-free bushing and the casing are in interference fit; the elastic member is a spring, and the bottom of the casing is provided with a protrusion, The protrusion is matched with the inner hole of the bottom of the spring; the diameter of the top cover is larger than the diameter of the opening, the spring is compressed and encapsulated in the casing, and the compression amount of the pressed spring multiplied by the spring stiffness is the overload protection force value. The height of the oil-free bushing is determined. 2 . The decoupling device for a large field of view telescope according to claim 1 , wherein the housing comprises an outer shell, and an upper cover and a bottom cover respectively provided with both ends of the outer shell, the upper cover and the first An upper baffle ring and a disc spring are sequentially arranged between the rolling support assemblies from bottom to top, and the flexible hinge is penetrated through the upper baffle ring and the disc spring. 3. The decoupling device for a large field of view telescope according to claim 2, wherein the upper retaining ring and the first rolling support assembly are interference fit with the inner hole wall formed by the upper cover, so that the upper The retaining ring and the first rolling support assembly are fixed in the lateral direction inside the housing. 4. The decoupling device for a large field of view telescope according to claim 1, wherein the housing comprises an outer shell, and an upper cover and a bottom cover respectively provided with both ends of the outer shell, the upper cover and the bottom cover are Shell threaded connection. 5 . The decoupling device for a large field of view telescope according to claim 1 , wherein the plurality of balls of the ball group are evenly distributed on the support frame. 6 .

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