CN111308686A

CN111308686A - Large-caliber lens cone structure of solar telescope

Info

Publication number: CN111308686A
Application number: CN201911241771.9A
Authority: CN
Inventors: 毕勇; 杨晓寒
Original assignee: Nanjing Astronomical Instruments Co Ltd
Current assignee: Nanjing Astronomical Instruments Co Ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-06-19

Abstract

The invention discloses a large-caliber solar telescope lens cone structure, which comprises a four-leaf beam, an F1 focus, a truss, a four-way joint and a counterweight; the truss is fixedly connected to the upper portion of the four-way joint, the four-blade beam is fixedly connected to the upper end of the truss, the F1 focus is fixed to the truss below the four-blade beam, and the lower end of the four-way joint is provided with a detachable counterweight. The primary mirror chamber of the solar telescope is connected with the upper ring of the cross joint, the lens cone pitch axis of the solar telescope is positioned on the upper center of the cross joint, and the primary mirror chamber of the solar telescope is completely exposed on the cross joint. The invention is convenient to install and disassemble; the weight of the balance weight of the lens cone can be effectively reduced, and the influence of turbulence phenomenon formed by the heat effect caused by sunlight irradiation on the four-way joint on the imaging quality of the telescope can be effectively reduced; the area of sunlight irradiating on the surface of the truss can be effectively reduced, and therefore the influence of a turbulence phenomenon formed by a heat effect on the imaging quality of the telescope is reduced.

Description

Large-caliber lens cone structure of solar telescope

Technical Field

The invention belongs to the field of astronomical telescopes, and particularly relates to a lens cone truss structure of a large-caliber solar telescope.

Background

Along with the increase of the aperture of the light transmission, the structure of the telescope is rapidly increased. While the primary mirror of the solar telescope is very sensitive to the thermal environment. On one hand, the thermal inertia of the primary mirror is increased, the temperature gradient in the primary mirror and the hysteresis of the temperature of the primary mirror relative to the ambient temperature are more and more obvious, and the surface shape precision of the reflecting surface of the telescope is influenced; on the other hand, the contact area between the outer surface of the primary mirror and the external environment is larger, the relative heat dissipation area is smaller, and the temperature difference between the reflecting surface and the environment causes the heat boundary layer of the reflecting surface to form strong heat turbulence fluctuation, so that the air refractive index field near the telescope is disordered, and the imaging quality of the system is seriously influenced.

Disclosure of Invention

The invention aims to solve the problems of large volume and large mass of the lens cone, designs a detachable connected truss structure, and facilitates transportation, installation and detachment of the whole structure of the lens cone. Meanwhile, a novel lens barrel structure is designed for reducing the influence of the thermal environment generated by sunlight irradiation on the lens barrel on the imaging quality of the solar telescope, and the influence of the turbulence phenomenon generated by the thermal effect on the imaging quality of the telescope is reduced.

In order to solve the technical problems, the invention adopts the following technical scheme:

the large-caliber solar telescope lens barrel structure comprises a four-leaf beam, an F1 focus, a truss, a four-way joint and a counterweight; the truss is fixedly connected to the upper portion of the four-way joint, the four-blade beam is fixedly connected to the upper end of the truss, the F1 focus is fixed to the truss below the four-blade beam, and the lower end of the four-way joint is provided with a detachable counterweight.

Furthermore, the truss, the four-way joint and the balance weight are of truss structures.

Furthermore, the four-way joint is formed by welding square pipes and comprises a four-way upper ring and a four-way lower ring, a main mirror chamber of the solar telescope is connected with the four-way upper ring, a lens cone pitching axis of the solar telescope is positioned on the upper side of the center of the four-way joint, and the main mirror chamber of the solar telescope is completely exposed on the four-way joint.

Furthermore, the truss is a cylindrical double-layer truss structure with the same diameter of the outer circle, and when the sun irradiates on the upper surface of the truss, the truss is shielded by the generated shadow.

Furthermore, the upper end of the truss of the balance weight is connected with the four-way joint and is connected by the thin rod to form a closed ring, so that the rod piece is prevented from shaking and deforming in the dismounting process, the bottom of the truss of the balance weight is provided with a steel bottom ring, and the bottom ring can be added with the small sectional balance weight to balance the lens cone.

Furthermore, a structure capable of applying pretightening force is arranged at the joint of the four-blade beam and the F1 focus and the truss, so that the natural frequency of the lens barrel can be improved, and the stress deformation of the lens barrel can be improved. .

The invention has the following beneficial effects:

1. the large-caliber solar telescope lens cone is large in size and heavy in weight, and the four-leaf beam, the F1 focus, the truss, the four-way joint and the balance weight are arranged into a detachable connected truss structure, so that the large-caliber solar telescope lens cone is convenient to mount and dismount.

2. The solar telescope chamber is connected with the four-way upper ring, the lens cone pitching axis is located the four-way center on the upper side, the weight of the lens cone counterweight can be effectively reduced, the main mirror is completely exposed on the four-way, and the influence of the turbulence phenomenon formed by the heat effect brought by sunlight irradiation on the four-way on the imaging quality of the telescope can be effectively reduced.

3. The solar telescope lens cone truss part is designed into a cylindrical structure, and when sunlight irradiates the upper surface of the truss, the generated shadow part can well shield the truss. The area of sunlight irradiating on the surface of the truss can be effectively reduced, and therefore the influence of a turbulence phenomenon formed by a heat effect on the imaging quality of the telescope is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a lens barrel of a large-aperture solar telescope.

FIG. 2 is a plan view of the large-aperture solar telescope in the direction of the optical axis.

FIG. 3 is a schematic diagram of the structure of the primary mirror chamber and the four-way valve.

Fig. 4 is a top view of the lens barrel truss in the optical axis direction.

In the figure: 1. four-leaf beams; 2. a truss; 3. f1 focus; 4. a main mirror chamber; 5. four-way connection; 6. and (4) balancing weight.

Detailed Description

In order to better understand the present invention, the following examples are further provided to illustrate the present invention.

The technical scheme of the invention is mainly to design a large-caliber lens cone structure of the solar telescope, which reduces the influence of the thermal environment generated by sunlight irradiating on the lens cone on the imaging quality of the solar telescope, and simultaneously, in order to solve the problems of large volume and heavy weight of the lens cone, the lens cone structure is designed into a detachable connection truss structure, thereby facilitating the transportation, installation and detachment of the whole structure of the lens cone.

The 2-meter aperture solar telescope column structure shown in fig. 1 comprises a four-blade beam 1, an F1 focus 3, a truss 2, a four-way joint 5 and a counterweight 6. Truss 2 and cross 5 are connected through bolts, and four-lobed beam 1, F1 focus 3 and truss 2 are connected through bolts. The lower end of the cross joint 5 is provided with a detachable counterweight 6 which is connected through a bolt.

The 2-meter aperture solar telescope lens barrel is large in size and weight, and the four-leaf beam 1, the F1 focus 3, the truss 2, the four-way joint 5 and the balance weight 6 are arranged into a detachably connected truss structure, so that the solar telescope lens barrel is convenient to mount and dismount. Wherein the four-way 5 assembly is a welding piece and is mainly connected with the counterweight 6 and the truss 2. The upper end of the counterweight 6 is connected with the cross joint 5 through a screw and is connected by a thin rod to form a closed ring, so that the rod piece is prevented from shaking and deforming in the dismounting process. A steel bottom ring is designed at the bottom of the counterweight 6, and small sectional counterweights can be added on the bottom ring to balance the lens barrel. The truss 2 adopts a double-layer truss structure, the truss 2 is integrally designed into a detachable rod piece structure, and the truss can be installed through screws. The lens cone four-leaf beam 1 and the F1 focus 3 are designed into a detachable sheet structure and are connected with the truss 2 through bolts, so that the lens cone four-leaf beam is convenient to detach and mount. Meanwhile, the joint is designed into a structure capable of applying bolt pretightening force, so that the natural frequency of the lens cone can be improved, and the stress deformation of the lens cone is improved.

As shown in fig. 3, 2 meters bore solar telescope lens-barrel cross 5 structure forms through square tube welding, and the ring is fitted with a contraceptive ring and is linked to each other with cross 5 in main mirror room 4, and lens-barrel pitch axis is located the cross center on the upper side, can effectively reduce lens-barrel counter weight to on the main mirror exposes cross 5 completely, can effectively reduce the sunlight and shine the torrent phenomenon to the influence of telescope imaging quality that the heat effect that brings on whole cross 5 formed.

As shown in fig. 2 and 4, when sunlight irradiates on the lens barrel truss along the optical axis direction, the truss can be well shielded by the shadow part generated by the circular ring structure on the truss 2. The area of sunlight irradiating on the surface of the truss 2 can be effectively reduced, and therefore the influence of a turbulence phenomenon formed by a heat effect on the imaging quality of the telescope is reduced.

The invention can solve the problems of large volume and heavy weight of the lens cone of the large-caliber solar telescope, and can reduce the influence of turbulence phenomenon caused by the heat effect generated by sunlight irradiating on the lens cone truss and the four-way on the imaging quality of the telescope.

In summary, the invention provides a detachable connected truss structure, wherein the four-leaf beam, the F1 focus, the truss, the four-way joint and the balance weight are connected through the bolts, so that the transportation, the installation and the detachment of the whole structure of the lens barrel are facilitated. Meanwhile, the main mirror is arranged on the four-way joint 5, the outer circle of the truss is of a structure similar to a cylinder, and the influence of turbulence phenomenon caused by the heat effect generated by sunlight irradiating on the lens barrel on the imaging quality of the telescope can be effectively reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The large-aperture solar telescope lens barrel structure is characterized by comprising a four-blade beam (1), an F1 focus (3), a truss (2), a four-way joint (5) and a counterweight (6); truss (2) fixed connection is in the top of cross (5), four leaf roof beams (1) fixed connection is in the upper end of truss (2), F1 focus (3) are fixed in on truss (2) of four leaf roof beams (1) below, the lower extreme of cross (5) is provided with detachable counter weight (6).

2. The large-aperture solar telescope tube structure according to claim 1, wherein the truss (2), the cross (5) and the counterweight (6) are truss structures.

3. The large-aperture solar telescope tube structure according to claim 1, wherein the cross joint (5) is formed by welding square tubes and comprises a cross joint upper ring and a cross joint lower ring, the main lens chamber (4) of the solar telescope is connected with the cross joint upper ring, the tube pitch axis of the solar telescope is positioned on the upper center of the cross joint (5), and the main lens chamber (4) of the solar telescope is completely exposed on the cross joint (5).

4. The lens barrel structure of the large-caliber solar telescope according to claim 1, wherein the truss (2) is a cylindrical double-layer truss structure with the same diameter of the outer circle, and when the sun irradiates on the upper surface of the truss (2), the generated shadow part shields the truss.

5. The lens cone structure of the large-caliber solar telescope according to claim 2, wherein the upper end of the truss of the counterweight (6) is connected with the cross joint (5) and is connected by a thin rod to form a closed ring, the bottom of the truss of the counterweight (6) is provided with a steel bottom ring, and small sectional counterweights can be added on the bottom ring to balance the lens cone.

6. The large-aperture solar telescope tube structure according to claim 1, wherein the connection between the four-lobed beam (1) and the F1 focus (3) and the truss (2) is provided with a structure capable of exerting pre-tightening force.