JPH11281167A - Solar beam tracking system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solar beam tracking system comprising a plurality of solar beam collecting units arranged in two rows along first rotational axis rotatably about the first rotational axis and a second rotational axis orthogonal thereto in which each unit can rotates about the second axis through a simple arrangement employing a single drive source while setting a relatively large rotational angle about the first rotational axis. SOLUTION: A plurality of solar beam collecting units 15 arranged on first rotational axis C1 while being interlinked through a parallel link are born rotatably about a second rotational axis on a pair of rotary frames 14 rotatably about the first rotational axis C1. A cable drive means 53 is connected with one ends of a pair of push-pull cables 54 having the other ends connected, respectively, with the plurality of solar beam collecting units 15 born on both rotary frames 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of rotating a plurality of solar light collecting units arranged in two rows along a first rotation axis about a first rotation axis. Also, the present invention relates to a sunlight tracking device capable of rotating around a second rotation axis orthogonal to the first rotation axis.

[0002]

2. Description of the Related Art Conventionally, such a solar tracking device has been already known, for example, from Japanese Patent Publication No. 57-10337.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
At a plurality of locations spaced apart in the axial direction of the main shaft whose center coincides with the first rotation axis, the sunlight collecting units rotatable around the second rotation axis are mounted so as to be aligned on both sides of the main shaft. A motor is connected to one end of a drive shaft extending in parallel with the first rotation axis, and a plurality of worms provided on the drive shaft are meshed with fan-shaped worm wheels connected to the respective solar collection units. ing. For this reason, when the main shaft rotates around its axis, that is, the first rotation axis, each solar light collecting unit rotates so as to draw a rotation trajectory at a position away from the center of the main shaft. Location constraints increase. In particular, when rotating the main shaft to rotate each solar collection unit in the east-west direction, the rotation angle is relatively large, so the free space required for rotation of each solar collection unit increases, For example, it would be difficult to install it on the roof of a house.

In order to solve such a problem, a plurality of sunlight collecting units are respectively mounted on a pair of rotating frames rotatable around a pair of first rotating axes set in parallel with each other. It is conceivable that the solar collection unit is supported so as to be rotatable about a rotation axis. However, when the solar collection units are rotated about the second rotation axis, a drive mechanism including a worm and a worm wheel as in the related art is used. If it is used, a driving source such as a motor is required for each rotating frame, and it is necessary to precisely control both driving sources so as to increase the cost and to prevent variation between the rotating frames.

The present invention has been made in view of such circumstances, and it has been made possible to make the space required for installation relatively small and to make the rotation angle about the first rotation axis relatively large. In addition, it is an object of the present invention to provide a solar tracking device in which each solar collecting unit can be rotated around the second axis with a simple configuration using a single drive source.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of solar light collecting units arranged in two rows along a first rotation axis are provided for the first time. It is possible to rotate around the dynamic axis,
In a solar tracking device capable of rotating around a second rotation axis orthogonal to the rotation axis, a pair of rotation frames includes:
Rotation about a pair of first rotation axes set parallel to each other is enabled and supported between the first and second support plates, and each rotation frame has a plane parallel to the first rotation axis. A plurality of solar collection units connected to each other by the arranged parallel links and arranged on the first rotation axis are rotatable around a plurality of second rotation axes respectively corresponding to the respective solar collection units. A single cable driving means is provided on the first support plate, and the other ends of a pair of push-pull cables, one ends of which are connected to the cable driving means, are respectively supported by a plurality of rotating frames. And is connected to one of the solar collection units.

According to such a configuration, the plurality of sunlights arranged on the first rotation axis are provided on the pair of rotation frames rotatable around the pair of first rotation axes parallel to each other. Since the collecting units are supported so as to be rotatable around the second rotation axis, each of the solar collection units can be rotated by the first rotation of the solar collection units when the rotation frame rotates about the first rotation axis. The rotation of the solar collection unit around the first rotation axis is relatively small, and the space required for rotation of the solar collection unit around the first rotation axis is relatively small. Can be largely rotated about the first rotation axis. Each solar collection unit is connected to each other by a parallel link disposed in a plane parallel to the first rotation axis, and a pair of push-pull cables each having one end connected to a single cable driving unit. The other end is connected to one of the solar collection units, each of which is supported by a plurality of rotating frames, so that each solar collection unit can be connected to a single unit without complicated control. It is possible to rotate around the second axis with a simple configuration using a drive source.

[0008] The invention according to claim 2 provides the above-mentioned claim 1.
In addition to the configuration of the invention described in the above, the first support plate is provided with a pair of rotating frame driving means for rotating each rotating frame around a first rotation axis, and It is provided on the first common support plate between the moving frame driving means.

According to the second aspect of the present invention, the cable driving means can be compactly arranged on the first support plate.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, an upper portion of each of the solar light collecting units is capable of rotating around a second rotating axis. According to such a configuration, each solar collection unit is supported by the rotating frame at a position close to the upper surface of the solar collection unit, that is, the light receiving surface, and the light receiving surface The position can be stabilized.

According to a fourth aspect of the present invention, in addition to the configuration of the third aspect of the present invention, the other end of each of the push-pull cables is connected to the sun above the center in the vertical direction of the solar collection unit. According to this configuration, the sunlight collection unit can be relatively largely rotated around the second rotation axis by using a push-pull cable having a relatively small stroke. it can.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

1 to 6 show an embodiment of the present invention. FIG. 1 is a plan view of a photovoltaic power generator, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 4, and FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. .

First, in FIGS. 1 and 2, a pair of first and second support plates 11, 12 arranged at positions spaced apart in the north-south direction, for example, are fixed on the ground or on the roof of a house. Fixed on a supporting frame 13. Between the support plates 11 and 12, a plurality of, for example, a pair of first rotation axes C1 and C1 along the north-south direction are set at positions spaced from each other, and the first rotation axes C1 and C1 are provided.
A plurality of, for example, a pair of pivot frames 1
4 and 14 are supported between the support plates 11 and 12, respectively, and the two rotating frames 14 are provided with two sets of solar light collecting units, for example, five units arranged on each of the first rotating axes C1 and C1. The units 15, 15... Rotate about a plurality of second rotation axes C2, C2... Which are set for each of the sunlight collecting units 15, 15. Each is supported as possible. That is, when the first rotation axis C1 is along the north-south direction, each solar collection unit 1
Are supported by each of the rotating frames 14 so as to be able to rotate around a second rotation axis along the east-west direction.

Each of the sunlight collecting units 15, 15... Has a quadrangular pyramid-shaped housing 16 having a large upper portion, a lens 17 fixed to the upper end of the housing 16 so as to close the upper end of the housing 16, and The housing 16 converts the light collected by the lens 17 into electrical energy.
And a solar cell (not shown) disposed at the lower part of the inside of each of the solar cell units.
Are driven so as to follow the sun so that the upper surface, that is, the light receiving surface of the light collecting units 15 is always directed to the sun.

The turning frame 14 includes a pair of side plates 14a, 14a extending along the first turning axis C1, and a pair of side plates 14a.
a, 14a, a pair of end plates 14b, 14b
And is formed in a rectangular frame shape.
First and second main shafts 18 and 19 whose axes are aligned with the first rotation axis C1 are fixed to 4b and 14b, respectively. Thus, the first main shaft 18 is rotatably supported by the first support plate 11, which is one of the two support plates 11, 12, and the second main shaft 1
9 is rotatably supported by a second support plate 12, which is the other of the two support plates 11, 12.

Referring to FIGS. 3 and 4, both ends of the first support plate 11 are provided with rotating frame driving means 20, 20 respectively corresponding to each rotating frame 14, 14. The rotating frame driving means 20, 20 are housed in a pair of gear cases 21, 21, respectively.

Each of the gear cases 21 includes a case 22 integrally formed at both ends of the first support plate 11,
2 are formed in the same shape, each having a cover 23 which is fastened to the rotating frame 14.
The main shaft 18 protrudes into the gear case 21.

The rotating frame driving means 20 includes two first rotating axes C
1, a drive shaft 24 extending in a direction orthogonal to C1, a worm 25 provided on the drive shaft 24, a worm wheel 26 meshing with the worm 25, an intermediate gear 27 rotating integrally with the worm wheel 26, A driven gear 28 fixed to the first main shaft 18 is provided to enable power transmission from the drive shaft 24 to the first main shaft 18.

Both ends of the drive shaft 24 are rotatably supported by the case portion 22, and a worm 25 is provided at an intermediate portion of the drive shaft 24. The worm wheel 26 has a support member 29 fastened to the case 22 in the gear case 21.
The worm wheel 26 is spline-coupled to a rotating shaft 30 rotatably supported with an axis parallel to the first rotating axes C1 and C1. The intermediate gear 27 is provided integrally with the rotation shaft 30 at a position close to the rotation shaft 30. That is, the support member 29 is integrally provided with a cylindrical support cylinder portion 29a, and an axis of the rotation shaft 30 is provided between the rotation shaft 30 inserted into the support cylinder portion 29a and the support cylinder portion 29a. A pair of bearings 31 and 32 are provided so as to prevent the directional movement, and the worm wheel 26 is spline-coupled to the rotating shaft 30 so as to be sandwiched between the inner ring of one bearing 31 and the intermediate gear 27.

The driven gear 28 is formed in a fan shape, and is fastened to the first main shaft 18 by a plurality of bolts 33. Thus, a bearing 34 is provided between the first main shaft 18 and the case portion 22, and an annular seal member 35 is provided so as to be located outside the bearing 34. .

In FIG. 5, a supporting member 29 is fastened to the case 22 by a plurality of, for example, three fastening bolts 36. The supporting members 29 are supported so that the fastening bolts 36 can be inserted and screwed into the case 22. The insertion holes 37 provided in the member 29 are formed as elongated holes along the axial direction of the drive shaft 24, respectively. Accordingly, the position of the drive shaft 24 in a direction parallel to the axis can be adjusted, and the support member 29 can be attached to the case 22, that is, the first support plate 11.

In one gear case 21 in which one of the two rotating frame driving means 20 is accommodated, a rotating frame driving motor 40 has a rotation axis parallel to the axis of the drive shaft 24. The rotating frame driving motor 4 is housed and fixed.
0 is provided on the output shaft 41 of the drive shaft 24.
Is meshed with a gear 43 provided at one end of the gear. As a result, the driving force output from the rotating frame driving motor 40 is reduced by the output gear 42 and the gear 43 and
4 and further decelerated by the one rotating frame driving means 20 and transmitted to the one rotating frame 14.

The driving shaft 24 of the one rotating frame driving means 20 and the driving shaft 24 of the other rotating frame driving means 20 are connected to a transmission shaft 44 extending along the axial direction of the two driving shafts 24.
Are connected to both ends of the motor through universal joints 45 and 46, respectively. Rotational driving force generated by the operation of the single rotation frame driving motor 40 is transmitted from both the rotation frame driving means 20 and 20 to both the first main shafts 11. , 11 shafts, and both rotating frames 14, 14
It turns around the turning axes C1 and C1.

Further, the transmission shaft 44 is disposed below the first support plate 11, and a universal joint 45 for connecting the transmission shaft 44 and the drive shaft 24 of the one rotating frame driving means 20. Protection case 47 in which both gear cases 2
It is provided between 1 and 21.

In each of the rotating frames 14, 14, the upper part of each of the sunlight collecting units 15, 15,... Has a second rotating axis C2, C2,.
Each is supported so that it can rotate around. That is, a pair of sub shafts 48, 48 whose axes are aligned with the second rotation axes C2, C2,... Are fixed to both upper side surfaces of each of the solar light collecting units 15, 15,. Are connected to each of the rotating frames 14.
Are rotatably supported by bearings 49, 49,... Which are fixedly arranged at intervals of five on the upper surfaces of both side plate portions 14a, 14a.

Moreover, the lower part of the two solar light collecting units 15, 15...
Are connected to connecting rods 50 extending along the direction of arrangement of 5, 15,... Via connecting shafts 51, 51 so as to be rotatable about axes parallel to the second rotation axes C2, C2.
The side plates 14a, 14a of the rotating frame 14, the sunlight collecting units 15, 15,... And the connecting frame 50 form a parallel link 52 in a plane parallel to the first rotating axis C1.
That is, the sunlight collecting unit 1 for each of the rotating frames 14, 14
Are connected via parallel links 52 arranged in a plane parallel to the first rotation axis.

A single cable driving means 53 is provided on the first support plate 11 between the rotating frame driving means 20 and 20, and a pair of push-pulls each having one end connected to the cable driving means 53. The other ends of the cables 54, 54 are respectively connected to one of the solar collection units 15, 15,.

In FIG. 6, the cable driving means 53 is
A cable driving motor 57; a screw shaft 58 extending in a direction parallel to a rotation axis of the cable driving motor 57; a driving gear 60 provided on an output shaft 59 of the cable driving motor 57; Being screwed shaft 585
8, a driven gear 61 fixed to one end of the screw shaft 58,
And a nut 62 screwed to the screw shaft 58 while being prevented from rotating about its axis.

The cable driving motor 57 has a case 6 composed of a cap-shaped cover 63 and an end plate 64 fastened to the first support plate 11 by closing the open end of the cover 63.
One end of the screw shaft 58 is rotatably supported by the end plate 64 and protrudes into the case 65. The end of the output shaft 59 protruding from the cable driving motor 57 is rotatably supported by the end plate 64, and the drive gear 60 provided integrally with the output shaft 59 in the case 65 is provided inside the case 65. At the driven gear 28 fixed to one end of the screw shaft 58.

The end plate 64 of the case 65 has a screw shaft 5
One end of a guide tube 66 that extends from the first support plate 11 to the second support plate 12 side is fixedly accommodated, and the other end of the guide tube 66 is closed by a closing plate 67. The other end of the screw shaft 58 is rotatably supported by a bearing plate 68 which is in contact with the inner surface of the closing plate 67, and the axis of the screw shaft 58 is provided between the bearing plate 68 and the end plate 64. A pair of regulating rods 73 extending parallel to the axis of the screw shaft 58 at positions deviated from
... are provided. Thereby, the guide cylinder 66 of the bearing plate 68
Rotation within is prevented. Moreover, the two regulating rods 73 penetrate the nut 62 screwed to the screw shaft 58, and the rotation of the nut 62 is prevented by the two regulating rods 73. Therefore, the nut 62 reciprocates in the axial direction according to the rotation of the screw shaft 58. End plate 6
4, an end plate 64 of the nut 62 which is in contact with the nut 62;
The stopper 69 that regulates the moving end in the direction approaching the position is fixed.

The push-pull cable 54 is formed by movably inserting an inner cable 56 into an outer cable 55.
One end of the outer cable 55 at 54 is fixed to the end of a first stay 70 connected to the guide cylinder 66 so as to extend further from the guide cylinder 66 toward the second support plate 12, and from one end of each outer cable 55 One end of the protruding inner cable 56 movably penetrates the closing plate 67 and the bearing plate 68 and is connected to the nut 62.

On the other hand, in each of the rotating frames 14, 14, two of the five solar collection units 15, 15... Arranged closer to the second support plate 12.
The second stays 71 are fixedly attached to the rotating frames 14 between the..., And the upper ends of the sunlight collecting units 15, 15. Arms 72 extending vertically are arranged so as to be connected to the sub shaft 48 and the lower end is connected to the connection shaft 51.

The two push-pull cables 54, 54
The other ends of the outer cables 55, 55 are fixed to the second stays 71, 71, respectively.
The other ends of the inner cables 56 projecting from the other end of the connecting shaft 5 are connected to the arms 72 above the center position between the sub shaft 48 and the connecting shaft 51. That is, the other ends of the inner cables 56, 56 are connected to the sunlight collecting unit 15,
15 are connected to a position close to the sub shaft 48 above the center in the vertical direction.

Next, the operation of this embodiment will be described. A pair of rotating frames 14, 14 rotatable around a pair of first rotating axes C1, C1 parallel to each other, respectively.
, Which are arranged side by side on the first rotation axes C1, C1 are second rotation axes C2, C
2 are supported so as to be rotatable around, so that each of the solar light collecting units 15, 15,... Is rotated when the rotary frames 14, 14 around the first rotary axis C1, C1. , 15,... Rotate around the portions located on the first rotation axes C1, C1. Therefore, the space required by the rotation of the solar collection units 15, 15... Around the first rotation axis C1 is relatively small, and a large number of the solar collection units 15, 15,. When the first rotation axis C1 is arranged along the north-south direction, each of the solar light collecting units 15, 15,... Is rotated greatly as the sun moves from the east side to the west side. Can move.

Rotating frame driving means 20, 20 are arranged at fixed positions corresponding to the rotating frames 14, 14, respectively, and one of the rotating frame driving means 20, 20 is provided with a rotating frame driving means. The driving force is input from the motor 40, and the driving force is connected from the driving shaft 24 of the rotating frame driving means 20 to the driving shaft 24 of the other rotating frame driving means 20 via the transmission shaft 44, so that the driving force is complicated. Each of the solar light collecting units 15, 15... Is controlled by a single rotating frame driving motor 40 without requiring control.
Can be rotated about the first rotation axes C1 and C1.

Further, the drive shaft 24 of the rotating frame driving means 20 to which the rotating frame driving motor 40 is connected and the driving shaft 24 of the other rotating frame driving means 20 are composed of the transmission shaft 44 and the universal joint 4.
Since the connection is made via the connecting members 5 and 46, a change in the size between the rotating frame driving means 20 and 20 due to an error in assembling the first supporting plate 11 and the like can be absorbed, and reliable power transmission can be performed.

Further, since the transmission shaft 44 is disposed below the first support plate 11, no extra space is required for disposing the transmission shaft 44, and the space efficiency can be improved. At the same time, the transmission shaft 44 and the universal joint 45 can be protected by the first support plate 11, and it is not necessary to greatly increase the strength of the protection cylinder 47 that houses the transmission shaft 44 and the universal joint 45.

Further, the reduction ratio of the rotating frame driving means 20, 20 is increased by the worm 25 and the worm wheel 26 provided in each rotating frame driving means 20, 20, and the operation amount of the rotating frame driving motor 40 is increased. Even if there is a rotating frame 14,
Of the solar collection units 15, 15... By reducing the amount of rotation around the first rotation axes C1, C1 of the first rotation axes C1, C1.
1, the rotation around C1 can be controlled accurately. In addition, since the function of preventing the reverse rotation due to the engagement of the worm 25 and the worm wheel 26 can be obtained by the rotating frame driving means 20, 20, the rotating frames 14, 1 are acted on by the external force.
4 can be prevented from rotating. In addition, since the position of the rotary shaft 30 provided with the worm wheel 26 can be adjusted along the axial direction of the drive shaft 24, the backlash between the gears of the rotary frame drive means 20, 20 can be easily absorbed. As a result, it is possible to prevent generation of abnormal noise at the time of operation, and to prevent variations in the amount of rotation of each of the rotating frames 14, 14 as much as possible.

Are connected to each other by parallel links 52 arranged in a plane parallel to the first rotation axis C1 to rotate around the second rotation axes C2, C2. The push-pull cables 54, 54, which are supported by the rotating frame 14 so as to be able to move, and whose one ends are connected to a single cable driving means 53, have the other ends connected to both rotating frames 14, 54.
14 are connected to one of the plurality of solar collection units 15, 15... Respectively supported by a plurality of units, so that each of the solar collection units 15, 15. Can be rotated around the second rotation axes C2, C2,... With a simple configuration using the cable driving motor 57 of FIG.

Further, the cable driving means 53 is provided on the first support plate 11 between the pair of rotating frame driving means 20 provided on the first support plate 11, and the cable driving means 53 is provided with the first driving means. It can be arranged compactly on the support plate 11.

Further, each of the solar light collecting units 15, 15,...
Are rotatable around the second rotation axes C2, C2,... And are supported by the respective rotation frames 14, 14, so that the upper parts of the sunlight collection units 15, 15,. Each of the solar light collecting units 15, 15,... Is supported by the rotating frames 14, 14, so that the position of the light receiving surface can be stabilized. In particular, when the solar collection unit 15 has a shape in which the upper part is larger than the lower part as in this embodiment, the position of the light receiving surface can be effectively stabilized, and the solar collection unit 15 is supported. The balance is also good.

In addition, the push-pull cable 5
Are arranged above the center of the sunlight collecting units 15 in the vertical direction.
Are connected to the solar collection units 15, 15,... Using the push-pull cables 54, 54 having relatively small strokes. It becomes possible.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above-described embodiment, a single rotating frame driving motor 40 is provided on only one of the rotating frame driving means 20, 20.
May be provided with a rotating frame driving motor 40 respectively.

Further, the solar collection unit 15 may collect and collect solar heat instead of collecting sunlight and generating power.

[0047]

As described above, according to the first aspect of the present invention, the space required for each solar light collecting unit by its rotation about the first rotation axis is made relatively small, It is possible to largely rotate around one rotation axis. Also, the solar collection units are connected to each other by parallel links arranged in a plane parallel to the first rotation axis, and are rotated by a single cable driving means via a pair of push-pull cables. The power is transmitted to one of the solar collection units of the frame, and each solar collection unit is connected to the second axis by a simple configuration using a single drive source without requiring complicated control. Can rotate around.

According to the second aspect of the present invention, the cable driving means can be compactly arranged on the first support plate.

According to the third aspect of the present invention, the position of the light receiving surface is stabilized by supporting each solar light collecting unit at the position close to the upper surface of the solar light collecting unit, that is, the light receiving surface. Can be changed.

Further, according to the fourth aspect of the present invention, by using a push-pull cable having a relatively small stroke,
The solar light collecting unit can be relatively rotated around the second rotation axis.

[Brief description of the drawings]

FIG. 1 is a plan view of a solar power generation device.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG.

FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... 1st support plate 12 ... 2nd support plate 14 ... rotation frame 15 ... sunlight collection unit 20 ... rotation frame drive means 52 ... parallel link 53 ... Cable driving means 54: push-pull cable C1: first rotation axis C2: second rotation axis

Claims (4)

[Claims] 1. A plurality of sunlight collecting units (15) arranged in two rows along a first rotation axis (C1) can be rotated around the first rotation axis (C1). In addition, in a solar tracking device capable of rotating around a second rotation axis orthogonal to the first rotation axis (C1), a pair of rotation frames (14) are set parallel to each other. The first rotation axis (C1) is supported between the first and second support plates (11, 12) so as to be rotatable around the first rotation axis (C1). Each rotation frame (14) has a first rotation axis ( A plurality of sunlight collecting units (15) interconnected by parallel links (52) arranged in a plane parallel to C1) and arranged on the first rotation axis (C1) are arranged in each of the sunlight collecting units (15). 15) A support that is rotatable about a plurality of second rotation axes (C2) respectively corresponding to (15). The first support plate (11) is provided with a single cable driving means (53), and the other end of a pair of push-pull cables (54), one end of which is connected to the cable driving means (53), A plurality of solar collecting units (1) supported by a plurality of rotating frames (14), respectively.
5) A solar tracking device, wherein the solar tracking device is connected to one of the above items. 2. A pair of rotating frame driving means (20) for rotating each rotating frame (14) about a first rotating axis (C1) is provided on the first support plate (11). The solar tracker according to claim 1, wherein the cable driving means (53) is provided on the first support plate (11) between the two rotating frame driving means (20). 3. An upper part of each of the solar light collecting units (15) is rotatable around a second rotation axis (C2), and is supported on each of the rotation frames (14). 3. The solar tracking device according to 1 or 2. 4. The other end of each of the push-pull cables (54) is connected to the solar light collecting unit (15) above the vertical center of the solar light collecting unit (15). The solar tracking device according to claim 3, wherein