CN115727553B

CN115727553B - A double-axis trough solar collector

Info

Publication number: CN115727553B
Application number: CN202211580292.1A
Authority: CN
Inventors: 李波涛; 李文杰; 崔豫; 魏丽芬
Original assignee: Hebei Zhufeng Apparatus & Meter Co ltd
Current assignee: Hebei Ruiding Automation Equipment Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2024-11-15
Anticipated expiration: 2042-12-09
Also published as: CN115727553A

Abstract

The invention relates to the technical field of solar engineering, in particular to a double-shaft groove type solar heat collector, which comprises a heat collecting unit, an azimuth driving unit, a height angle driving unit, a supporting unit, a rotary joint unit, a column assembly and the like, wherein a reflecting mirror vertically reflects sunlight on a vacuum heat collecting tube, and a medium in the vacuum heat collecting tube absorbs heat through a heat absorbing coating; the azimuth driving unit drives the heat collecting units which are arranged in parallel to rotate around the solar azimuth full sunlight time; the altitude driving unit is driven to rotate around the full sunlight time of the solar altitude in cooperation with the azimuth driving unit; the support unit is used for supporting the heat collecting units which are arranged in parallel and combined in series, and the rotary joint unit is used for solving the problem that the heat collecting units rotate and the upright post components are required to be connected.

Description

Double-shaft groove type solar heat collector

Technical Field

The invention relates to the technical field of solar engineering, in particular to a double-shaft groove type solar heat collector.

Background

The double-shaft trough type solar collector is a double-shaft tracking of the trough type collector around the altitude and azimuth angles of the sun. The rotation speed reducer is used for realizing rotation around the azimuth angle of the sun, and the electric push rod is used for realizing rotation around the altitude angle of the sun so as to realize double-shaft tracking around the sun. The heat absorption part of the trough type heat collector consists of a reflecting mirror and a vacuum heat collecting tube, wherein the reflecting mirror reflects sunlight into the vacuum heat collecting tube. The vacuum heat collecting tube conveys out the absorbed heat and provides clean and pollution-free energy for users. The double-shaft groove type solar heat collector designed by us is a double-shaft double-groove type tracking structure (see patent CN202120619708.0 for omnibearing tracking parabolic mirror heat energy absorbing device). The omnibearing tracking parabolic mirror heat energy absorbing device is a first-generation product of our company, and has a plurality of defects as follows:

1. Flexible connections for the transport medium use metal hoses. The metal hose breaks and leaks oil due to rotation in the use process, and is not easy to maintain.

2. The angle steel for the reflector bracket is welded, and the angle steel can not be attached to the radian of the reflector, so that a large number of assembly tools are needed to ensure the installation accuracy during installation, and a measuring instrument is needed to debug a plurality of parts.

3. The vacuum heat collecting pipe is connected by welding. When the heat collecting tube is lost in vacuum or damaged, the heat collecting tube is inconvenient to replace.

4. The girder and the accessories are welded, the precision can be ensured by using the tool, and the deformation is unavoidable after the welding by using the tool. When the reflector and the heat collecting pipe are assembled, a large number of assembly tools are needed to ensure the installation precision, and a measuring instrument is needed to debug a plurality of parts.

To address these deficiencies, the present invention provides a dual-axis trough solar collector.

1. The hose connected with the upright post is changed into a hard tube which is placed inside the upright post, so that the hose is attractive in appearance and the damage of strong wind to the hose can be reduced.

2. The metal hose of the rotating part is changed into a rotary joint form. So as to solve the problem of oil leakage caused by breakage of the metal hose due to rotation in the using process. The rotation device is divided into an altitude rotation device and an azimuth rotation device.

3. The reflector bracket is formed by cold-bending and punching a cold-rolled steel plate grinding tool in one step. The radian on the reflector bracket is consistent with that of the reflector, so that welding deformation is reduced, and mounting accuracy is improved.

4. The single evacuated collector tubes are connected by adopting flanges. When the heat collecting tube is lost in vacuum or damaged, the heat collecting tube is convenient to replace.

5. The girder and the accessory adopt an assembly mode, so that welding deformation is reduced, and the integral precision is improved. The sunlight which always keeps parallel is vertically reflected to the evacuated collector tube.

6. The heat collection tracking adopts a non-photosensitive element technology, and adopts a technology of building a mathematical model by a space-time algorithm, so that tracking errors are reduced.

The space-time algorithm of the double-shaft groove type solar collector builds a mathematical model tracking program, so that the three-dimensional normal direction of the solar collector tracks the movement track of the sun in all directions, the normal incidence is realized in full sunlight time, and zero cosine loss is realized. The tracking precision is up to 0.015 degrees, and the heat collection efficiency is up to more than 80%.

Disclosure of Invention

The invention adopts the technical scheme that: a double-shaft trough type solar collector is characterized in that a plurality of rows of trough type parabolic reflector heat collecting units (comprising 2 units) which are arranged in parallel are subjected to double-shaft tracking around the elevation angle and azimuth angle of the sun, and the parallel sunlight is always kept to be vertically reflected onto a vacuum heat collecting tube through a reflector. At least comprises: the device comprises a heat collection unit, an azimuth driving unit, an altitude driving unit, a supporting unit, a rotary joint unit, a column assembly and the like.

The heat collecting unit consists of a reflecting mirror and a vacuum heat collecting tube which are arranged in parallel and combined in series, the reflecting mirror vertically reflects sunlight on the vacuum heat collecting tube, and a medium in the vacuum heat collecting tube absorbs heat through a heat absorbing coating;

The azimuth driving unit drives the heat collecting units which are arranged in parallel to rotate around the solar azimuth full sunlight time;

The altitude driving unit is driven to rotate around the full sunlight time of the solar altitude in cooperation with the azimuth driving unit;

the supporting unit is used for supporting the heat collecting units which are arranged in parallel and combined in series and is used for installing the azimuth driving unit and the altitude driving unit.

The rotary joint unit consists of an azimuth double rotary joint and a height angle rotary joint and is used for solving the problem that the heat collection unit rotates and the upright post component is not movable and needs to be connected.

The heat collector adopts a space-time algorithm to build a tracking program of a mathematical model, so that the three-dimensional normal direction of the heat collector tracks the movement track of the sun in all directions, the normal incidence is realized in full sunlight time, and zero cosine loss is realized. The tracking precision is up to 0.015 degrees, and the heat collection efficiency is up to more than 80%.

The heat collecting unit consists of serially and parallelly arranged reflectors and vacuum heat collecting pipes fixed on the focal axis of each reflector, and the reflector unit is fixed on a reflector bracket connecting plate of the main beam assembly through a first reflector bracket and a second reflector bracket. The vacuum heat collecting pipe is fixed on the heat collecting pipe bracket connecting plate of the main beam component through the heat collecting pipe bracket.

The power device of the azimuth driving unit is a rotary speed reducer, the upper end of the rotary speed reducer is connected with the supporting bracket, and the lower end of the rotary speed reducer is connected with the connecting column positioning pipe assembly. The connecting column positioning tube assembly is connected with the upright column.

The power device of the altitude driving unit is an electric push rod, and the upper end of the electric push rod is connected with a push rod connecting beam on the wind-resistant frame through a push rod upper connecting device. The lower end is connected with the support bracket through a push rod connecting plate.

The supporting unit comprises a supporting bracket and an anti-wind frame. The wind-resistant frame is formed by fixing a U-shaped guard plate of a lintel in a full-surrounding mode on a main beam assembly by an edge connecting beam, a bevel edge beam, a push rod connecting beam and a middle connecting Liang Tong so as to form a square frame. The heat collecting pipe support connecting plate and the reflector support connecting plate are fixed on the girder component in a full-surrounding mode through the support U-shaped guard plate. The rotating shaft connecting piece is fixed in the middle of the main beam assembly, and the first supporting inclined beam and the second supporting inclined beam (15-10) are respectively fixed on two sides of the main beam assembly and the rotating shaft connecting piece. The main beam component is not subjected to deflection deformation.

The rotary joint unit consists of an azimuth double rotary joint and an altitude rotary joint.

The azimuth double-rotary joint is characterized in that two channels which are mutually connected are respectively arranged on the fixed shaft and the rotary shell, the lower end of the rotary shell is concentrically connected with the rotary speed reducer, the two channels on the fixed shaft are respectively correspondingly connected with the two channels on the connecting column positioning pipe assembly, and the two channels on the rotary shell are respectively connected with one end of the altitude angle rotary joint on two sides through rotary joint connecting pipes. The other end of the altitude angle rotary joint is connected with the rotating shaft component through a cross universal joint.

The rotating shaft assembly is connected with the supporting bracket and the main beam and the rotating shaft connecting piece through two bearings with seats, and the altitude angle rotating joint is connected with the supporting bracket through an altitude angle rotating joint connecting plate.

One end of the vacuum heat collecting pipe on each heat collecting unit is connected with the vertical pipe assembly, the short transverse pipe assembly, the long transverse pipe assembly and the transition hose assembly through the transverse pipe assembly, and then is connected with the altitude angle rotary joint, the rotary joint connecting pipe, the azimuth angle double rotary joint, the connecting column positioning pipe assembly, the external connecting pipe assembly and the upright post inner pipe in sequence, so that a complete medium loop is formed. The transverse tube assembly is provided with a transverse tube inclined bracket and a U-shaped clamp which are supported and fixed. The vertical pipe component is provided with a vertical pipe support and a U-shaped clamp which are supported and fixed, and the short transverse pipe component and the long transverse pipe component are respectively provided with a transverse pipe component support and a U-shaped clamp which are supported and fixed.

The device has two limits, namely an initial limit and a termination limit. Two travel switches are arranged on each limiting device to play a role of double insurance. The travel switch is installed on the travel switch support, and the travel switch support is connected with the spliced pole locating tube assembly. The ram component is connected with the support bracket and rotates along with the rotary speed reducer, and the rotation angle 2A is more than or equal to 280 degrees.

The height angle of the homing position is less than or equal to 5 degrees, and the heat collector is vertically arranged after homing and is contacted with the limit plug head assembly welded on the upright post assembly, so that the heat collector is prevented from shaking in heavy wind. The reflector is vertically arranged to play a role in dust prevention, snow prevention and frosting prevention.

The lower end of the upright post assembly is provided with an electric control cabinet, a tracking program of a mathematical model is built by adopting a space-time algorithm, so that the three-dimensional normal direction of the heat collector tracks the movement track of the sun in all directions, the normal incidence of the whole sunlight time is realized, and the zero cosine loss is realized. The tracking precision is up to 0.015 degrees, and the heat collection efficiency is up to more than 80%.

Drawings

The following will be further described with reference to the accompanying drawings:

fig. 1: a structural schematic diagram of the specific implementation of the invention;

fig. 2: a schematic diagram of a front view of an implementation of the present invention;

fig. 3: schematic side view of an implementation of the invention.

Fig. 4: schematic top view of an implementation of the invention

Fig. 5: schematic of a wind resistant frame embodying the invention

Fig. 6: schematic diagram of homing position of the implementation of the invention

Fig. 7: schematic diagram of a limiting device embodying the invention

In the drawings, reference numerals are:

1. An upright post inner pipe; 2. a column; 3. an electric appliance control cabinet; 4. a spacing plug assembly; 5. an external connection pipe; 6. a connecting column positioning tube assembly; 7. a rotary speed reducer; 8. azimuth double rotary joint assembly; 9. a support bracket; 10. a heat collecting pipe bracket; 11. a spindle assembly; 12. a cross universal joint; 13. a height angle swivel; 14. a rotary joint connecting pipe; 15. an anti-wind frame; 16. a cross tube assembly; 17. a transverse tube inclined bracket; 18. a first mirror support; 19. a second mirror support; 20. a reflecting mirror; 21. a bearing with a seat; 22. the upper connecting device of the push rod; 23. an electric push rod; 24. a height angle rotary joint connecting plate; 25. a travel switch; 26. a travel switch bracket; 27. a striker assembly; 28. a push rod connecting plate; 29. a transverse tube bracket; 30. a U-shaped clip; 31. a standpipe bracket; 32. a long transverse tube assembly; 33. a short cross tube assembly; 34. a standpipe assembly; 35. a vacuum heat collecting pipe; 36. a transition hose assembly;

15-1, a main beam assembly; 15-2, edge connecting beams; 15-3, oblique side beams; 15-4, connecting the push rod with the beam; 15-5, connecting the main beam with the rotating shaft; 15-6 parts of middle connecting beams, 15-7 parts of heat collecting pipe bracket connecting plates; 15-8, a reflector bracket connecting plate; 15-9, a first supporting inclined beam; 15-10, a second supporting oblique beam; 15-11, a bracket U-shaped guard board; 15-12, beam U-shaped guard plates.

Detailed Description

As shown in fig. 1,2, 3 and 4, a dual-axis trough solar collector at least comprises: the device comprises a heat collection unit, an azimuth driving unit, an altitude driving unit, a supporting unit, a rotary joint unit, a column assembly and the like.

Parallel rows of trough-type parabolic reflector heat collection units are in double-axis tracking around the elevation angle and azimuth angle of the sun, and parallel sunlight is always kept to be vertically reflected onto a vacuum heat collection tube (35) through a reflector (20).

The number of rows of the multi-row reflector heat collecting units is more than or equal to 1, and the embodiment of the invention consists of 2 reflector heat collecting units.

The heat collecting unit consists of a reflecting mirror (20) and a vacuum heat collecting tube (35) which are arranged in parallel and combined in series, the reflecting mirror (20) vertically reflects sunlight on the vacuum heat collecting tube (35), and a medium in the vacuum heat collecting tube (35) absorbs heat through a heat absorbing coating.

The azimuth driving unit drives the heat collecting units which are arranged in parallel to rotate around the solar azimuth full sunlight time; always parallel sunlight is vertically incident on the reflecting mirror (20).

The altitude driving unit is used for driving the heat collecting unit to rotate around the full sunlight time of the altitude of the sun in cooperation with the azimuth driving unit; the sunlight which is always kept parallel is vertically reflected to the evacuated collector tube (35) through the reflecting mirror (20).

The rotary joint unit consists of an azimuth double rotary joint (8) and a height angle rotary joint (13) and is used for solving the problem that the heat collection unit rotates and the upright post component (2) is not moved and needs to be connected.

As shown in fig. 1, 2, 3 and 4, the heat collecting unit is composed of parallel-arranged serial-parallel combined reflectors (20) and vacuum heat collecting pipes (35) fixed on the focal axis of each reflector, and the reflectors (20) are fixed on reflector bracket connecting plates (15-8) of the main beam assembly (15-1) through first reflector brackets (18) and second reflector brackets (19). The vacuum heat collecting tube (35) is fixed on the heat collecting tube bracket connecting plate (15-7) of the main beam component (15-1) through the heat collecting tube bracket (10).

As shown in fig. 2, the power device of the azimuth driving unit is a rotary speed reducer (7), the upper end of the rotary speed reducer (7) is connected with a supporting bracket (9), and the lower end of the rotary speed reducer is connected with a connecting column positioning pipe assembly (6). The connecting column positioning pipe assembly (6) is connected with the upright column (2).

As shown in fig. 3, the power device of the altitude driving unit is an electric push rod (23), and the upper end of the electric push rod (23) is connected with a push rod connecting beam (15-4) on the wind-resistant frame through a push rod upper connecting device (22). The lower end is connected with the support bracket (9) through a push rod connecting plate (28).

As shown in fig. 3 and 5, the support unit includes a support bracket (9) and a wind resistant frame. The wind-resistant frame is formed by fixing an edge connecting beam (15-2), a bevel edge beam (15-3), a push rod connecting beam (15-4) and a middle connecting beam (15-6) on a main beam assembly (15-1) in a full-surrounding mode through a beam U-shaped guard plate (15-12). The heat collecting pipe bracket connecting plate (15-7) and the reflector bracket connecting plate (15-8) are fixed on the main beam component (15-1) in a full-surrounding mode through the bracket U-shaped guard plate (15-11). The rotating shaft connecting piece (15-5) is fixed in the middle of the main beam assembly (15-1), and the first supporting inclined beam (15-9) and the second supporting inclined beam (15-10) are respectively fixed on two sides of the main beam assembly (15-1) and the rotating shaft connecting piece (15-5). The main beam component (15-1) is not subjected to deflection deformation.

As shown in fig. 2, the rotary joint unit is composed of an azimuth double rotary joint (8) and an altitude rotary joint (13). The fixed shaft on the azimuth double-rotary joint (8) and the rotary shell are respectively provided with two mutually connected channels, the lower end of the rotary shell is concentrically connected with the rotary speed reducer (7), the two channels on the fixed shaft are respectively correspondingly connected with the two channels on the connecting column positioning pipe assembly (6), and the two channels on the rotary shell are respectively connected with one end of the altitude angle rotary joint (13) on two sides through rotary joint connecting pipes (14). The other end of the altitude angle rotary joint (13) is connected with the rotating shaft assembly (11) through a cross universal joint (12). The rotating shaft assembly (11) is respectively connected with the supporting bracket (9) and the main beam and rotating shaft connecting piece (15-5) through two bearings (21), and the altitude angle rotating joint (13) is connected with the supporting bracket (9) through an altitude angle rotating joint connecting plate (24).

As shown in fig. 1 and 2, one end of a vacuum heat collecting tube (35) on each heat collecting unit is connected with a transverse tube assembly (16), and the other end of the vacuum heat collecting tube is connected with a vertical tube assembly (34), a short transverse tube assembly (33), a long transverse tube assembly (32) and a transition hose assembly (36) and then sequentially connected with a high-angle rotary joint (13), a rotary joint connecting tube (14), an azimuth double rotary joint (8), a connecting column positioning tube assembly (6), an external connecting tube assembly (5) and a vertical column inner tube (1), so that a complete medium loop is formed. The transverse tube assembly is provided with a transverse tube inclined bracket (17) and a U-shaped clip (30) which are supported and fixed. The vertical pipe component (34) is provided with a vertical pipe bracket (31) and a U-shaped clamp (30) for supporting and fixing, and the short transverse pipe component (33) and the long transverse pipe component (32) are respectively provided with a transverse pipe component bracket (29) and a U-shaped clamp (30) for supporting and fixing.

As shown in fig. 7, the device has two limits, namely a start limit and a stop limit. Two travel switches (26) are arranged on each limiting device to play a role of double insurance. The travel switch (26) is arranged on the travel switch bracket (25), and the travel switch bracket (25) is connected with the connecting column positioning tube assembly (6). The ram component (27) is connected with the support bracket (9) and rotates along with the rotary speed reducer (7), and the rotation angle 2A is more than or equal to 280 degrees.

As shown in fig. 6, the height angle of the homing position is less than or equal to 5 degrees, the heat collector is vertically arranged after homing, and the wind-resistant frame is contacted with the limit plug head assembly (4) welded on the upright post assembly (2) to prevent shaking in heavy wind. The reflector (20) is vertically arranged and can play a role in dust prevention, snow prevention and frosting prevention.

An electric appliance control cabinet (3) is arranged at the lower end of the upright post assembly (2), a tracking program of a mathematical model is built by adopting a space-time algorithm, so that the three-dimensional normal direction of the heat collector tracks the movement track of the sun in all directions, the normal incidence of the full sunlight time is realized, and zero cosine loss is realized. The tracking precision is up to 0.015 degrees, and the heat collection efficiency is up to more than 80%.

Claims

1. A dual-axis trough solar collector, comprising at least: a heat collection unit, an azimuth drive unit, an altitude drive unit, a support unit, a rotary joint unit, and a column;

The heat collection unit is a heat collection unit with multiple rows of reflectors, which tracks the altitude angle and azimuth angle of the sun in two axes, and always keeps parallel sunlight reflected vertically onto the vacuum heat collection tube (35) through the reflectors (20);

The multi-row reflector heat collection unit is composed of two reflector heat collection units;

The multi-row reflector heat collection unit is composed of reflectors (20) and vacuum heat collection tubes (35) arranged in parallel and connected in series. The reflectors (20) reflect sunlight vertically onto the vacuum heat collection tubes (35), and the medium in the vacuum heat collection tubes (35) absorbs heat through the heat absorption coating.

The azimuth driving unit drives the heat collecting unit to rotate around the solar azimuth during the whole sunshine period; the parallel sunlight is always kept vertically incident on the heat collecting unit with multiple rows of reflectors;

The elevation angle driving unit and the azimuth angle driving unit cooperate with each other to drive the multi-row reflector heat collection unit to rotate around the solar elevation angle during the whole sunshine period, so as to always keep the sunlight reflected vertically by the reflector (20) onto the vacuum heat collection tube (35);

The support unit is used to support the multi-row reflector heat collection unit and to install the azimuth angle drive unit and the elevation angle drive unit;

The rotary joint unit is composed of an azimuth double rotary joint (8) and an elevation rotary joint (13), and is used to solve the problem that the multi-row reflector heat collection unit rotates while the column (2) does not move and needs to be connected;

The support unit comprises a support bracket (9) and a wind-resistant frame. The wind-resistant frame is formed by a side connecting beam (15-2), a slant side beam (15-3), a push rod connecting beam (15-4) and an intermediate connecting beam (15-6) being fully surrounded and fixed on a main beam assembly (15-1) through a beam U-shaped guard plate (15-12) to form a square frame. A heat collecting tube bracket connecting plate (15-7) and a reflector bracket connecting plate (15-8) are fully surrounded and fixed on the main beam assembly (15-1) through a bracket U-shaped guard plate (15-11). A rotating shaft connecting member (15-5) is fixed in the middle of the main beam assembly (15-1). A first supporting oblique beam (15-9) and a second supporting oblique beam (15-10) are respectively fixed on both sides of the main beam assembly (15-1) and the rotating shaft connecting member (15-5), so as to prevent the main beam assembly (15-1) from bending and deformation.

2. A dual-axis trough solar collector according to claim 1, characterized in that: the multi-row reflector collection unit is composed of parallel-arranged series-parallel combined reflectors (20) and vacuum heat collection tubes (35) fixed on the focal axis of each reflector, the reflectors (20) are fixed to the reflector bracket connecting plate (15-8) of the main beam assembly (15-1) through the first reflector bracket (18) and the second reflector bracket (19), and the vacuum heat collection tube (35) is fixed to the heat collection tube bracket connecting plate (15-7) of the main beam assembly (15-1) through the heat collection tube bracket (10).

3. A dual-axis trough solar collector according to claim 1, characterized in that: the power device of the azimuth drive unit is a rotary reducer (7), the upper end of the rotary reducer (7) is connected to the support bracket (9), and the lower end is connected to the connecting column positioning tube assembly (6), and the connecting column positioning tube assembly (6) is connected to the column (2).

4. A dual-axis trough solar collector according to claim 1, characterized in that: the power device of the altitude angle drive unit is an electric push rod (23), the upper end of the electric push rod (23) is connected to the push rod connecting beam (15-4) on the wind-resistant frame through the push rod upper connecting device (22), and the lower end is connected to the supporting bracket (9) through the push rod connecting plate (28).

5. A dual-axis trough type solar collector according to claim 3, characterized in that: the rotary joint unit is composed of an azimuth double rotary joint (8) and an altitude rotary joint (13), the fixed shaft on the azimuth double rotary joint (8) and the rotating shell each have two mutually connected channels, the lower end of the rotating shell is concentrically connected to the rotary reducer (7), the two channels on the fixed shaft are respectively connected to the two channels on the connecting column positioning tube assembly (6), the two channels on the rotating shell are respectively connected to the interfaces of one end of the altitude rotary joint (13) on both sides through the rotary joint pipe (14), the other end of the altitude rotary joint (13) is connected to the rotating shaft assembly (11) through a cross universal joint (12), the rotating shaft assembly (11) is respectively connected to the supporting bracket (9) and the main beam and the rotating shaft connecting piece (15-5) through two seat bearings (21), and the altitude rotary joint (13) is connected to the supporting bracket (9) through the altitude rotary joint connecting plate (24).

6. A dual-axis trough solar collector according to claim 1, characterized in that: one end of each vacuum collecting tube (35) on the multi-row reflector collecting unit is connected by a transverse tube assembly (16), and the other end is connected to the vertical tube assembly (34), the short transverse tube assembly (33), the long transverse tube assembly (32) and the transition hose assembly (36), and then connected to the altitude angle rotary joint (13), the rotary joint pipe (14), the azimuth angle double rotary joint (8), the connecting column positioning tube assembly (6), the external pipe assembly (5) and the column inner tube (1) in sequence, so that a complete medium circuit is formed, the transverse tube assembly is supported and fixed by a transverse tube oblique bracket (17) and a U-shaped clip (30), the vertical tube assembly (34) is supported and fixed by a vertical tube bracket (31) and a U-shaped clip (30), and the short transverse tube assembly (33) and the long transverse tube assembly (32) are supported and fixed by the transverse tube assembly bracket (29) and the U-shaped clip (30) respectively.

7. A dual-axis trough type solar collector according to claim 3, characterized in that: the support unit has two limit devices, namely a starting limit device and a termination limit device, and the starting limit device and the termination limit device are each provided with two travel switches (26), which play a double insurance role, and each travel switch (26) is installed on its own travel switch bracket (25), and each travel switch bracket (25) is connected to the connecting column positioning tube assembly (6), and the striker rod assembly (27) is connected to the support bracket (9), and rotates with the rotary reducer (7), and the rotation angle 2A ≥ 280°.

8. A dual-axis trough solar collector according to claim 1, characterized in that: the height angle of the return position of the collector is ≤5°, the collector is placed vertically after returning to its original position, the wind-resistant frame contacts the limit plug assembly (4) welded on the column (2) to prevent shaking in strong winds, and the reflector (20) is placed vertically to prevent dust, snow and frost.

9. A dual-axis trough solar collector according to claim 1, characterized in that: an electrical control cabinet (3) is installed at the lower end of the column (2), and a tracking program of a mathematical model is constructed using a time-space algorithm, so that the collector can track the sun's motion trajectory in all directions in a three-dimensional normal direction, with normal incidence during the entire sunshine time, achieving zero cosine loss, a tracking accuracy of up to 0.015 degrees, and a heat collection efficiency of more than 80%.