Anti-frost fan device

Abstract

To provide an anti-frost fan device that allows rapid change of the fan orientation using a simple structure.SOLUTION: An anti-frost fan device 1A comprises: a fan 40; a swing unit 20 which has a rotation shaft 26 extending in the vertical direction, is provided on a support post 50, and performs a swinging motion by rotating around the axis of the rotation shaft 26; a frame 29 supported by the swing unit 20; and a pitch angle adjusting unit 30 including a support shaft 32, which is disposed on the frame 29 in a horizontally extending state and supports the fan 40 so as to be rotatable about its own axis, and an electrically driven cylinder 33 capable of extension and retraction, with its one end being connected to the frame 29 and the other end being connected to the fan 40, wherein the pitch angle adjusting unit adjusts the pitch angle of the fan 40 relative to the horizontal direction by extending and retracting the electrically driven cylinder 33 to rotate the fan 40 about the axis of the support shaft 32.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a frost-proof fan device. [Background technology]

[0002] Some frost-proof fan devices are provided with a depression angle adjustment unit that adjusts the depression angle of the fan relative to the horizontal direction in order to blow air in a desired direction.

[0003] For example, Patent Document 1 discloses a frost-proof fan device equipped with a depression angle adjustment unit that adjusts the depression angle of the fan by rotating a fan holder that holds the fan. This frost-proof fan device is provided with a gear provided on the fan holder and an electric motor that rotates the gear. In this frost-proof fan device, the electric motor rotates the gear to rotate the fan holder and adjust the orientation of the fan from horizontal to downward, or vice versa. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-170065 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the frost-proof fan device described in Patent Document 1 has a complex structure because it uses gears, and it is also difficult to quickly point the fan in a desired direction.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to provide a frost-proof fan device that can quickly change the direction of the fan with a simple configuration. [Means for solving the problem]

[0007] In order to achieve the above object, the frost-proof fan device according to the present invention comprises: With fans, an elevation / depression angle adjustment unit including: a first base supported by a support; a first shaft provided on the first base while extending horizontally and supporting the fan rotatably about its own axis; and an extendable cylinder having one end connected to the first base and the other end connected to the fan, the cylinder extending and contracting to rotate the fan about the axis of the first shaft, thereby adjusting at least the elevation / depression angle of the fan with respect to the horizontal direction; The present invention is characterized by comprising:

[0008] the one end of the cylinder is connected to the first base at a position away from the first shaft, and the other end of the cylinder is connected to the fan at a position away from a portion supported by the first shaft, The cylinder may have a rod and a first electric motor that moves the rod back and forth, and the first electric motor may move the rod back and forth to change the distance from the one end to the other end, thereby rotating the fan around the axis of the first shaft.

[0009] The device may further include a swiveling unit having a second shaft extending vertically to support the first base portion, the swiveling unit being attached to the support and rotating about the axis of the second shaft to perform a swiveling motion.

[0010] The axis of the second shaft of the oscillating unit may be arranged coaxially with the support pillar.

[0011] The second shaft is provided at an upper end of the support, The oscillating unit may further include a second electric motor arranged on the first base portion and having an output shaft oriented vertically, and a reducer arranged between the output shaft of the second electric motor and the second shaft.

[0012] The device may further include a positioning unit that is provided on the support pillar, supports the second shaft of the oscillating unit, and rotates around the axis of the support pillar to determine a position of the second shaft of the oscillating unit relative to the support pillar.

[0013] The positioning unit includes: A third axis extending in a direction of the column axis of the column; a second base portion having a bearing into which the third shaft is inserted and supporting the second shaft of the swing unit; having The second base portion may have a third electric motor having an output shaft that meshes with a gear provided on the third shaft, and the third electric motor may rotate the output shaft to rotate about the third shaft. Effect of the Invention

[0014] According to the configuration of the present invention, the depression / elevation angle adjustment unit includes a first base supported by a support column, a first shaft that is attached to the first base while extending horizontally and supports the fan rotatably about its own axis, and an extendable cylinder having one end connected to the first base and the other end connected to the fan. The cylinder extends and retracts to rotate the fan about the axis of the first shaft, thereby adjusting at least the depression angle of the fan relative to the horizontal direction. The frost-proof fan device has a simpler configuration than a depression angle adjustment unit that adjusts the depression angle of the fan relative to the horizontal direction by rotating a gear that rotates a fan holder. In addition, the frost-proof fan device can quickly change the direction of the fan. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing an example in which an antifrost fan device according to a first embodiment of the present invention is installed in a tea field. [Diagram 2] FIG. 1 is a side view showing an example in which an antifrost fan device according to a first embodiment of the present invention is installed in a tea field. [Diagram 3] FIG. 1 is a left side view of an antifrost fan device according to a first embodiment of the present invention. [Figure 4] FIG. 1 is a top view of an antifrost fan device according to a first embodiment of the present invention. [Diagram 5] FIG. 1 is a front view of an antifrost fan device according to a first embodiment of the present invention. [Figure 6] 1 is a plan view of a reduction gear of a positioning unit included in the frost-proof fan device according to Embodiment 1 of the present invention. [Figure 7] FIG. 11 is a left side view of an antifrost fan device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a frost-proof fan device according to an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are given the same reference numerals. In addition, in the orthogonal coordinate system XYZ shown in the drawings, the forward direction in which the impeller of the fan faces is the X-axis, the vertical direction in which the support column extends is the Z-axis, and the direction perpendicular to the X-axis and Z-axis is the Y-axis. In the following, this coordinate system will be referred to as appropriate in the description.

[0017] (Embodiment 1) The anti-frost fan device according to the first embodiment is a device that blows air from the top of a pole erected in a field to crops being grown in the field. This anti-frost fan device is equipped with a swing unit and a depression angle adjustment unit that change the direction of the fan to blow air from the top of the pole in a desired direction, and a positioning unit that adjusts the direction of the swing unit to determine its position. The detailed configuration of the anti-frost fan device will be described below with reference to Figs. 1 to 6. Note that the depression angle adjustment unit may adjust the elevation angle in addition to the depression angle, but the following description will be given of a form equipped with a depression angle adjustment unit that adjusts only the depression angle.

[0018] 1 and 2 are a perspective view and a side view showing an example in which the anti-frost fan device 1A according to the first embodiment is installed in a tea field R. Figs. 3 to 5 are a left side view, a top view, and a front view of the anti-frost fan device 1A according to the first embodiment. Fig. 6 is a plan view of the reduction gears 12-15 of the positioning unit 10 provided in the anti-frost fan device 1A. In order to facilitate understanding, the internal configuration is shown in solid lines instead of dotted lines in Fig. 3. Also, only the upper end portion of the support 50 erected in the field is shown in Fig. 3. Furthermore, in Fig. 6, the internal configuration of the stand 19 of the positioning unit 10 is shown in solid lines instead of dotted lines.

[0019] As described above, the anti-frost fan device 1A is a device provided in a farm field to prevent damage caused by frost. For example, if the farm field is a tea field, frost damage to tea during the growth period of new shoots may delay the plucking season or affect the yield and quality. The anti-frost fan device 1A is a device provided in a tea field R as shown in Figs. 1 and 2 to prevent frost from causing such damage. To blow air throughout such a tea field R, the anti-frost fan device 1A includes a positioning unit 10, a swing unit 20, a depression angle adjustment unit 30, and a fan 40 as shown in Figs. 3 to 5.

[0020] The positioning unit 10 is a unit that adjusts the orientation of the oscillating unit 20 shown in FIG. 3 to determine its position. In detail, as described later, the oscillating unit 20 oscillates around the column axis A of the support 50. For example, the oscillating unit 20 oscillates within a specific angle range, such as 120° or 180°, around the column axis A of the support 50. As a result, in the frost-proof fan device 1A, the position of the oscillating unit 20 must be determined when the support 50 is installed so that the area of ​​the field that requires air blowing falls within the oscillating angle range. Furthermore, once installed in this way, it is difficult to change the position of the oscillating unit 20 thereafter.

[0021] Therefore, in order to adjust the position of the angle range when the oscillating unit 20 oscillates, the positioning unit 10 adjusts the orientation of the oscillating unit 20 to determine the position of the oscillating unit 20. As shown in Fig. 3, the positioning unit 10 includes a rotation shaft 16 for changing the orientation of the oscillating unit 20, and a base 19 that performs the oscillating operation by the rotation shaft 16.

[0022] The support 50 extends in the vertical direction. A cylindrical member 51 is fitted to the upper end of the support 50. A rotating shaft 16 (also called the third shaft) is provided on the cylindrical member 51. The axis of the rotating shaft 16 is coaxial with the column axis A of the support 50 and the cylindrical axis of the cylindrical member 51. The rotating shaft 16 extends upward from the upper end of the support 50.

[0023] On the other hand, the base 19 is formed in a box shape with its rear end, i.e., -Y end, protruding downward, i.e., in the -Z direction. The motor 11 and reduction gears 12-15 are housed inside the base 19.

[0024] Motor 11 (also referred to as a third electric motor) has an output shaft oriented vertically. Motor 11 rotates the output shaft in a forward or reverse direction when supplied with electric power. A reduction gear 12 shown in FIG. 6 is provided on the output shaft of motor 11. As a result, motor 11 rotates reduction gear 12 in a forward or reverse direction. In this specification, rotation refers to a rotational movement in the forward and reverse directions.

[0025] As shown in Fig. 6, the reduction gears 12-15 (also called speed reducers) are each composed of a spur gear. The reduction gear 12 is provided coaxially with the output shaft of the motor 11. The reduction gear 12 meshes with the reduction gear 13. The reduction gear 13 meshes with the reduction gear 14, which meshes with the reduction gear 15. The diameters of the reduction gears 12-15 increase in the order of the reduction gears 12, 13, 14, and 15. The reduction gears 12-15 are thus arranged and shaped to transmit the rotation of the output shaft of the motor 11 at a reduced speed.

[0026] On the other hand, the reduction gear 15 is provided on the rotating shaft 16 and is coaxial with the rotating shaft 16. As described above, the rotating shaft 16 is provided on the cylindrical member 51, and as a result, as shown in FIG. 3, the rotating shaft 16 is fixed to the cylindrical member 51. Furthermore, the rotating shaft 16 is inserted into a bearing 18 provided on the lower surface of the base 19. As a result, when the output shaft of the motor 11 rotates in the forward or reverse direction, the rotation is transmitted to the reduction gear 12-14, and the reduction gear 12-14 rotates on its axis while revolving around the reduction gear 15. The reduction gear 12-14 is rotatably held by the base 19. Therefore, when the reduction gear 12-14 rotates on its axis while revolving, the base 19 rotates around the axis of the reduction gear 15. That is, the base 19 rotates around the axis of the rotation shaft 16. Since the axis of the rotating shaft 16 is coaxial with the support column 50 and the column axis A, the base 19 rotates around the support column 50 and the column axis A. As a result, the positioning unit 10 changes the orientation of the base 19 with respect to the column axis A of the support column 50 by rotating the output shaft of the motor 11 in the forward or reverse direction by a desired number of rotations. This allows the positioning unit 10 to point the base 19 in a desired direction and determine its position. A swivel unit 20 is mounted on the base 19 to perform a swivel operation around the desired direction.

[0027] The oscillating unit 20 has a similar configuration to the positioning unit 10 in order to perform an oscillating motion, in other words, to rotate about the column axis A of the support 50. That is, the oscillating unit 20 has a rotation axis 26 (also called the second axis) and a stand 29 (also called the first base portion) supported by the rotation axis 26.

[0028] The upper surface of the base 19 of the positioning unit 10 described above is disposed horizontally. A cylindrical member 27 is disposed coaxially with the rotation shaft 16 of the positioning unit 10 on the upper surface of the base 19. The rotation shaft 26 of the oscillating unit 20 is provided on the cylindrical member 27. Its position is coaxial with the cylindrical member 27. As a result, when the base 19 of the positioning unit 10 rotates around the axis of the rotation shaft 16 and its orientation is adjusted, the rotation shaft 26 of the oscillating unit 20 rotates together with the cylindrical member 27. Thus, the orientation of the rotation shaft 26 around the axis is adjusted by the positioning unit 10. The rotation shaft 26 extends further upward from the upper end of the cylindrical member 27.

[0029] On the other hand, the base 29 of the oscillating unit 20 is formed to have a base with the same shape and size as the base 19 of the positioning unit 10 described above, and a tip end that protrudes beyond the base, i.e., in the +Y direction in Fig. 3. The base of the base 29, like the base 19 of the positioning unit 10 described above, houses the motor 21 and reduction gears 22-25.

[0030] The arrangement, function, and operation of the motor 21 (also referred to as the second motor) and the reduction gear 22-25 are similar to those of the motor 11 and the reduction gear 12-15 of the positioning unit 10 described above. For this reason, a detailed description of the configuration will be omitted, but to briefly explain their operation, when the output shaft of the motor 21 rotates in the forward or reverse direction, the reduction gear 22-24 rotates on its own axis while revolving around the reduction gear 25 provided on the rotating shaft 26. The reduction gear 22-24 is rotatably installed on the base 29 of the oscillating unit 20, similar to the reduction gear 12-14 and the base 19 of the positioning unit 10. In addition, the base 29 of the oscillating unit 20 is provided with a bearing 28 that holds the rotating shaft 26, so that it can rotate around the axis of the rotating shaft 26. As a result, when the reduction gear 22-24 rotates on its own axis while revolving, the base 29 rotates around the axis of the rotating shaft 26. The axis of the rotating shaft 26 is coaxial with the rotating shaft 16 of the positioning unit 10, i.e., with the support 50 and the column axis A. Therefore, the base 29 rotates around the support 50 and the column axis A. As a result, the orientation of the base 29 relative to the support 50 and the column axis A changes by rotating the output shaft of the motor 21 in the forward or reverse direction by a desired number of rotations. In other words, the direction of oscillation around the column axis A of the support 50 changes. As a result, the oscillating unit 20 oscillates to orient the base 29 in the desired direction.

[0031] A depression angle adjustment unit 30 is mounted on such a stand 29 in order to adjust the depression angle of the fan 40 while it is swiveled in a desired direction.

[0032] The depression angle adjustment unit 30 is a unit that adjusts the depression angle of the fan 40 with respect to the horizontal direction in order to adjust the air blowing direction of the fan 40. In order to adjust the depression angle, the depression angle adjustment unit 30 is provided on the stand 29 of the oscillating unit 20 and has a support shaft 32 (also called the first shaft) that rotatably supports the fan holder 41, and an electric cylinder 33 that rotates the fan holder 41 about the support shaft 32 to adjust the depression angle of the fan holder 41.

[0033] The upper surface portion of the tip of the stand 29 of the oscillating unit 20 is disposed horizontally. The support shaft 32 is provided on the upper surface portion of the tip of the stand 29 with its axis oriented horizontally. In detail, when the tip of the stand 29 is oriented in the +Y direction, the support shaft 32 is provided on the stand 29 with its axis oriented in the left-right direction, i.e., the X direction.

[0034] 4, fan holder 41 has a plate bent into a U-shape, a bracket 43 that holds motor 42 that drives fan 40 in the opening of the U-shape, and a base 44 with two plates protruding downward, i.e., toward the -Z side, from bracket 43 and with the plate surfaces facing the X direction. Furthermore, a through hole (not shown) is formed in the -Z end portion of each plate of base 44.

[0035] The support shaft 32 shown in FIG. 3 is passed through the through holes not shown. The outer diameter of the support shaft 32 is slightly smaller than the diameter of the through holes. As a result, the support shaft 32 supports the base 44 in a state in which it can rotate around itself. That is, it rotatably supports the fan holder 41. As described above, the support shaft 32 has an axis oriented horizontally, which allows the fan holder 41 to rotate along a vertical plane. As a result, the support shaft 32 allows the fan holder 41 to be tilted up and down. On the other hand, the base 29 of the oscillating unit 20 is provided with an electric cylinder 33 as shown in FIG. 3 and FIG. 4 in order to tilt the fan holder 41 in the direction of a desired depression angle.

[0036] The electric cylinder 33 (also simply referred to as a cylinder) has a motor 34 (also referred to as a first electric motor), a power conversion mechanism (e.g., a ball screw) not shown that converts the rotation of the motor 34 into linear motion, and a rod 35 that moves back and forth by the power conversion mechanism.

[0037] As shown in FIG. 3, the fan holder 41 is provided with a protrusion 46 that protrudes downward from a support plate 45 of the bracket 43 to a smaller extent than the base 44. The protrusion 46 is disposed between two plates of the base 44 shown in FIG. 4, the plate surfaces of which face in the X direction. Furthermore, as shown in FIG. 3, the protrusion 46 is provided with a pin 36 that penetrates in the X direction. The tip of the rod 35 of the electric cylinder 33, i.e., the +Y end, is connected to the protrusion 46 by the pin 36. The +Y end of the rod 35 is rotatable around the pin 36. Meanwhile, the -Y end portion of the stand 29 of the oscillating unit 20 is provided with a pin 37 (also called a clevis pin) that extends in the X direction. The base end of the electric cylinder 33, i.e., the -Y end, is connected to the -Y end portion of the stand 29 by the pin 37. In this connection, the -Y end of the electric cylinder 33 is rotatable around the pin 37.

[0038] With this configuration, the electric cylinder 33 advances and retreats the rod 35 to change the distance between the protrusion 46 of the fan holder 41 and the -Y end portion of the stand 29 of the oscillating unit 20. As a result, the electric cylinder 33 rotates the fan holder 41 about the axis of the support shaft 32. In this way, the electric cylinder 33 adjusts the elevation angle of the fan holder 41 with respect to the horizontal direction.

[0039] At this time, a guide groove 47 is formed in the base 44 of the fan holder 41 by cutting out the plate of the base 44 in the shape of an arc centered on the support shaft 32. The fixed shaft 38 fixed to the stand 29 of the oscillating unit 20 passes through the guide groove 47. The width of the guide groove 47 is greater than the outer diameter of the fixed shaft 38. As a result, when the electric cylinder 33 rotates the fan holder 41 as described above, the guide groove 47 moves relative to the fixed shaft 38 with the fixed shaft 38 still inserted. This causes the guide groove 47 to rotate the fan holder 41 along an arc centered on the support shaft 32. As a result, the fan holder 41 is less likely to rattle when rotating. That is, the fan holder 41 is prevented from rattling when adjusting the elevation angle. Also, the elevation angle of the fan holder 41 is adjusted more accurately.

[0040] The fan holder 41 holds the fan 40. In detail, as shown in FIG. 4 and FIG. 5, the fan 40 has an impeller 48 and a motor 42 that supports the impeller 48 from the -Y side and rotates the impeller 48. The fan holder 41 shown in FIG. 3 holds the motor 42. The electric cylinder 33 of the depression angle adjustment unit 30 adjusts the elevation angle of the fan holder 41 with respect to the horizontal direction, thereby adjusting the direction of the rotation axis of the impeller 48 and adjusting the wind direction. As a result, the fan 40 blows wind in a desired downward direction. The fan 40 is provided at the upper end of a support 50 erected in a farm field, for example, a tea plantation R shown in FIG. 2. Therefore, by blowing wind in a desired downward direction, it is possible to send wind to a desired location in the farm field. As a result, the fan 40 can prevent a decrease in yield and quality during the plucking season due to frost damage.

[0041] To adjust the depression angle of the fan 40, the electric cylinder 33 adjusts the depression angle of the fan 40 with respect to the horizontal direction simply by moving the rod 35 forward and backward. Therefore, in the frost-proof fan device 1A, the air blowing direction can be easily adjusted. Also, the air blowing direction can be adjusted quickly. Furthermore, the configuration is simple because the tip and base ends of the electric cylinder 33 are connected to the fan holder 41 and the stand 29, and the fan holder 41 is simply supported by the stand 19 so that it can be rotated.

[0042] As described above, in the frost-proof fan device 1A according to the first embodiment, the depression angle adjustment unit 30 is provided on the stand 29 in a state of extending horizontally, and includes the support shaft 32 that supports the fan holder 41 rotatably about its own axis, and the extendable electric cylinder 33 that has one end connected to the stand 29 and the other end connected to the fan holder 41. The rod 35 of the electric cylinder 33 advances and retreats to rotate the fan holder 41 about the axis of the support shaft 32, thereby adjusting the depression angle of the rotation shaft of the impeller 48 of the fan 40 with respect to the horizontal direction. For this reason, the configuration is simpler than that of the frost-proof fan device including the depression angle adjustment unit that adjusts the depression angle of the fan by rotating the fan holder by rotating the gear described in Patent Document 1.

[0043] The depression angle of the fan 40 can be adjusted simply by advancing and retracting the rod 35 of the electric cylinder 33. Therefore, in the frost-proof fan device 1A, the orientation of the fan 40 can be quickly changed.

[0044] The frost-proof fan device 1A also includes a positioning unit 10 that changes the orientation of the oscillating unit 20. Therefore, the frost-proof fan device 1A can change the orientation of the oscillating unit 20 and cause the oscillating unit 20 to oscillate around that orientation. As a result, the frost-proof fan device 1A can blow air over a wider area of ​​the field.

[0045] Note that the term "rotation axis" refers to an axis that rotates itself, but in the first embodiment, the term "rotation axis" refers to an object supported by the axis that rotates around the axis. Thus, in this specification, the term "rotation axis" includes not only an axis that rotates itself, but also an object supported by the axis that rotates around the axis.

[0046] (Embodiment 2) In the frost-proof fan device 1A according to the first embodiment, the positioning unit 10 rotates the oscillating unit 20 around the column axis A of the support 50 to adjust the orientation and determine the position. However, the present invention is not limited to this. In the present invention, the presence or absence of the positioning unit 10 is optional.

[0047] Fig. 7 is a left side view of the frost-proof fan device 1B according to embodiment 2. In Fig. 7, for ease of understanding, the internal configuration is shown with solid lines instead of dotted lines, as in Fig. 3. Also, in Fig. 7, only the upper end portion of the support 50 is shown.

[0048] As shown in Fig. 7, the frost-proof fan device 1B according to the second embodiment does not include a positioning unit 10, but includes a swing unit 20, a depression angle adjustment unit 30, and a fan 40. The configurations of the swing unit 20, the depression angle adjustment unit 30, and the fan 40 are the same as those of the first embodiment, except that the rotation shaft 26 of the swing unit 20 is provided on a cylindrical member 51 at the upper end of the support 50, rather than on a cylindrical member 27 on the stand 19 of the positioning unit 10. For this reason, a detailed description of the configuration will be omitted, but by including such a configuration, the frost-proof fan device 1B can adjust the rotation direction of the rotation shaft of the impeller 48 of the fan 40 relative to the column axis A of the support 50 and the depression angle of the rotation shaft of the impeller 48 relative to the horizontal direction, as in the first embodiment, to blow air in a desired direction.

[0049] In this way, the present invention does not necessarily require the positioning unit 10. This is because, even in this configuration, the depression angle adjustment unit 30 is provided as in the first embodiment, so the configuration is simple and the orientation of the fan 40 can be quickly changed.

[0050] In the first embodiment, guide groove 47 in base 44 of fan holder 41 is formed on the bracket 43 side relative to support shaft 32. In contrast to this, in the second embodiment, guide groove 47 is formed on the opposite side to the bracket 43 side relative to support shaft 32, i.e., on the -Z side, as shown in Fig. 7. In this way, the position of guide groove 47 is arbitrary as long as guide groove 47 can guide the rotation of fan holder 41 in an appropriate direction.

[0051] Although the frost-proof fan devices 1A and 1B according to the first and second embodiments of the present invention have been described above, the present invention is not limited thereto. For example, in the first and second embodiments, the fan 40 is held by the fan holder 41, but the present invention is not limited thereto. In the present invention, the presence or absence of the fan holder 41 is optional. For example, the housing of the motor 42 of the fan 40 itself may be held by the depression angle adjustment unit 30.

[0052] In the first and second embodiments, the oscillating unit 20 includes the reduction gear 22-25, but the present invention is not limited thereto. The oscillating unit 20 may have a second shaft extending in the vertical direction, be attached to the support 50, and perform the oscillating operation by rotating around the axis of the second shaft. Therefore, the presence or absence of the reduction gear 22-25, the number of the reduction gears 22-25, and their shapes are optional. For example, the number of the reduction gears 22-25 included in the oscillating unit 20 may be changed according to the speed, accuracy, etc. of the positioning, and may be more than that in the first and second embodiments. The reduction gear 22-25 may be a reducer other than a gear.

[0053] The same is true for the positioning unit 10 described in embodiment 3. In the present invention, the positioning unit 10 is provided on the support 50, supports the rotation shaft 26 (also called the second shaft) of the oscillating unit 20, and rotates about the column axis A of the support 50 to determine the position, i.e., the orientation, of the rotation shaft 26 of the oscillating unit 20 relative to the support 50. Therefore, in the positioning unit 10 as well, the presence or absence of the reduction gears 12-15, the number of the reduction gears 12-15, and their shapes are optional. The number of the reduction gears 12-15 may be changed depending on the speed, precision, etc. of positioning.

[0054] In the first and second embodiments, the depression angle adjustment unit 30 has the fan 40 facing horizontally or downward from the horizontal direction, but in the present invention, the fan 40 may also be facing upward from the horizontal direction. In short, in the present invention, the depression angle adjustment unit 30 only needs to be a unit that adjusts at least the depression angle, and as a result, the elevation angle may be adjusted in addition to the depression angle. In that case, the depression angle adjustment unit 30 may be what is called a depression / elevation angle adjustment unit. In other words, the depression angle adjustment unit 30 may include what is called a depression / elevation angle adjustment unit.

[0055] The present invention allows various embodiments and modifications without departing from the broad spirit and scope of the present invention. The above-described embodiments are for the purpose of explaining the present invention and do not limit the scope of the present invention. In other words, the scope of the present invention is indicated by the claims, not the embodiments. Various modifications made within the scope of the claims and within the scope of the meaning of the invention equivalent thereto are considered to be within the scope of the present invention. [Explanation of symbols]

[0056] 1A, 1B...Frost prevention fan device 10...Positioning unit 11...Motor (third motor) 12-15…Reduction gear 16...Rotation axis (third axis) 18...Bearing 19… Stand (second base part) 20... Swing unit 21...Motor (second electric motor) 22-25…Reduction gear (reduction gear) 26...Rotation axis (second axis) 27...Cylindrical member 28...Bearing 29… Stand (first base part) 30 Depression angle adjustment unit 32...Support shaft (1st shaft) 33...Electric cylinder (cylinder) 34...Motor (first electric motor) 35…Rod 36,37…Pin 38…Fixed axis 40…Fan 41...Fan holder 42…Motor 43…Bracket 44…Bass 45...Support plate 46...Protrusion 47...Guide groove 48...Impeller 50...post 51...Cylindrical member A...Column axis R...Tea field

Claims

1. With fans, an elevation / depression angle adjustment unit including: a first base supported by a support; a first shaft provided on the first base while extending horizontally and supporting the fan rotatably about its own axis; and an extendable cylinder having one end connected to the first base and the other end connected to the fan, the cylinder extending and contracting to rotate the fan about the axis of the first shaft, thereby adjusting at least the elevation angle of the fan with respect to the horizontal direction; An anti-frost fan device comprising:

2. the one end of the cylinder is connected to the first base portion at a position away from the first shaft, and the other end of the cylinder is connected to the fan at a position away from a portion supported by the first shaft, The cylinder has a rod and a first electric motor that moves the rod back and forth, and the first electric motor moves the rod back and forth to change the distance from the one end to the other end, thereby rotating the fan around the axis of the first shaft. The frost-proof fan device according to claim 1.

3. The device further includes a swing unit having a second shaft extending vertically to support the first base portion, the swing unit being provided on the support column and rotating about the axis of the second shaft to perform a swing operation. The frost-proof fan device according to claim 1 or 2.

4. The axis of the second shaft of the swing unit is arranged coaxially with the support pillar. The frost-proof fan device according to claim 3.

5. The second shaft is provided at an upper end of the support pillar, The oscillating unit further includes a second motor arranged on the first base portion and having an output shaft oriented in a vertical direction, and a reducer arranged between the output shaft of the second motor and the second shaft.

5. The frost-proof fan device according to claim 4.

6. a positioning unit provided on the support pillar, supporting the second shaft of the oscillating unit, and rotating around a column axis of the support pillar to determine a position of the second shaft of the oscillating unit relative to the support pillar; The frost-proof fan device according to claim 3.

7. The positioning unit includes: A third axis extending in a direction of the column axis of the column; a second base portion having a bearing into which the third shaft is inserted and supporting the second shaft of the swing unit; having The second base portion has a third electric motor having an output shaft meshed with a gear provided on the third shaft, and the second base portion rotates about the third shaft by the third electric motor rotating the output shaft.

7. The frost-proof fan device according to claim 6.

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