Shaking head structure and fan

Abstract

The present invention discloses a shaking head structure and a fan. The shaking head structure includes: a dual-axis motor having a first main shaft and a second main shaft, the first main shaft being used to provide working power; a vertical shaft perpendicular to the second main shaft, with a reversing transmission mechanism connected between the top end of the vertical shaft and the second main shaft. When the second main shaft rotates, the vertical shaft is driven by the reversing transmission mechanism to rotate along its own axis; a connecting rod mechanism having a crank installed at the bottom end of the vertical shaft, a bushing rotatably installed at the top end of a support rod, and a connecting rod hinged between the crank and the bushing. When the vertical shaft rotates, the crank and the connecting rod drive the bushing to reciprocally rotate in a plane perpendicular to the vertical shaft. The present invention drives gear transmission through a dual-axis motor, and then drives the connecting rod mechanism to reciprocally rotate by the gear, so as to achieve large-angle left and right shaking heads at low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of oscillating head structures, and in particular to an oscillating head structure and a fan capable of oscillating head left and right at a large angle at low cost. Background Art

[0002] The fans currently on the market basically have an automatic shaking function, which are usually designed to be driven by a separate motor or a tail gear box. The following are the defects of the two solutions:

[0003] 1. The design scheme of using a separate motor to drive the shaking head can not only adjust the shaking head angle, but also realize the shaking head air supply in all directions. However, in addition to the main motor that drives the blades to rotate, the fan also needs an auxiliary motor to drive the shaking head of the whole machine, and the driving cost of the fan is too high;

[0004] 2. The design of using a tail tooth box to drive the shaking head is more widely used. The tail tooth box is provided with a pull rod extending out of the box. The shaking head can be achieved or stopped by pulling the pull rod up and down. This shaking head structure has limitations on the left and right angles, and the pitch adjustment angle is small, and the blowing range of the pitch shaking head is insufficient.

[0005] Therefore, how to design a shaking head structure and a fan with low cost and large air supply angle is a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0006] In order to solve the defects of the existing shaking head structure, the present invention proposes a shaking head structure and a fan. The shaking head structure can realize large-angle adjustment of the whole machine at a low cost, thereby achieving the effect of omnidirectional air supply.

[0007] The technical solution adopted by the present invention is to design a shaking head structure, including:

[0008] A dual-shaft motor having a first main shaft and a second main shaft, wherein the first main shaft is used to provide working power;

[0009] The vertical shaft is perpendicular to the second main shaft, and a reversing transmission mechanism is connected between the top of the vertical shaft and the second main shaft. When the second main shaft rotates, the reversing transmission mechanism drives the vertical shaft to rotate along its own axis;

[0010] The connecting rod mechanism comprises a crank mounted at the bottom end of the vertical shaft, a sleeve rotatably mounted at the top end of a support rod, and a connecting rod hinged between the crank and the sleeve. When the vertical shaft rotates, the sleeve is driven to reciprocate in a plane perpendicular to the vertical shaft through the crank and the connecting rod.

[0011] Preferably, the commutation transmission mechanism includes: a worm gear, a first commutation gear coaxially fixed with the worm gear, and a second commutation gear meshing with the first commutation gear. The axes of the first commutation gear and the second commutation gear are perpendicular to each other. The second commutation gear is coaxially fixed at the top of the vertical shaft, and the outer wall of the second main shaft is provided with a thread to form a worm engaging with the worm gear.

[0012] In some embodiments, both the first commutation gear and the second commutation gear are bevel gears.

[0013] Preferably, the bottom end of the vertical shaft is a non-circular transmission end, the crank is provided with a transmission hole matching the shape of the non-circular transmission end, the non-circular transmission end movably passes through the transmission hole, and the vertical shaft is connected with a swing switching mechanism for adjusting its height to engage or disengage the first bevel gear and the second bevel gear.

[0014] In some embodiments, the swing switching mechanism includes: a ring of protruding parts provided on the side wall of the vertical shaft, a spring abutted between the protruding parts and the crank, a push rod provided on one side of the vertical shaft and with the end close to the protruding parts, and a button assembly for controlling the forward and backward movement of the push rod. The end of the push rod is provided with a guiding surface, the guiding surface pushes the protruding parts downward when the push rod moves forward, and the spring pushes the protruding parts upward when the push rod moves backward.

[0015] In some embodiments, a rear shell is rotatably installed at the top of the support rod, the shaft sleeve is provided with a notch, and the rear shell is provided with a plug-in part located in the notch. When the shaft sleeve rotates, the rear shell is driven to rotate synchronously through the plug-in part.

[0016] Preferably, a cover shell is installed above the rear shell, the double-shaft motor is installed in the cover shell, the first main shaft extends out of the front of the cover shell, a receiving cavity is provided on the back of the cover shell, and the top of the rear shell is located in the receiving cavity; the rotating shaft of the worm gear is the central shaft, the central shaft movably passes through the rear shell and the receiving cavity, the cover shell can rotate around the central shaft to adjust the pitching angle, and a positioning structure for locking the pitching angle is provided between the receiving cavity and the rear shell.

[0017] In some embodiments, the positioning structure includes: an annular part provided on the outer wall of the rear shell and coaxially arranged with the central shaft, a positioning hole provided on the wall of the receiving cavity for receiving the annular part to be inserted, and a resistance part clamped between the annular part and the positioning hole. The central shaft movably passes through the annular part and extends into the cover shell from the positioning hole.

[0018] In some embodiments, the vertical shaft, the second bevel gear and the first bevel gear are all arranged in the rear shell, and a sliding groove for the worm to pass through is provided on the front of the rear shell, and the sliding groove allows the worm to follow the cover shell to adjust the pitching angle.

[0019] The present invention also proposes a fan, which adopts the above-mentioned swing structure.

[0020] Compared with the prior art, the present invention has the following beneficial effects;

[0021] 1. The biaxial motor drives the gear transmission, and then the gear drives the connecting rod mechanism to rotate reciprocally, achieving large-angle left and right shaking heads at low cost.

[0022] 2. The top of the rear shell is arranged in the accommodation cavity of the cover shell, the central axis passes through the rear shell and the accommodation cavity movably, and the cover shell rotates around the central axis to adjust the pitch angle, achieving large-angle pitch adjustment. Description of the Drawings

[0023] The present invention will be described in detail below in conjunction with the embodiments and the drawings, where:

[0024] Figure 1 is a schematic structural diagram of the fan in the present invention;

[0025] Figure 2 is an exploded schematic diagram of the shaking head structure in the present invention;

[0026] Figure 3 is an exploded schematic diagram of the shaking head structure with a housing in the present invention;

[0027] Figure 4 is a schematic structural diagram of the worm gear in the present invention;

[0028] Figure 5 is a schematic structural diagram of the vertical shaft in the present invention. Detailed Embodiments

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the drawings and the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] As Figures 1 to 3 shown, the shaking head structure proposed by the present invention can be applied to electrical appliances with a shaking head function, including but not limited to fans. The shaking head structure includes: a biaxial motor 1, a vertical shaft 2, a connecting rod mechanism 3, etc. The biaxial motor 1 has a first main shaft 11 and a second main shaft 12. The first main shaft 11 is used to provide working power, that is, the main function of the electrical appliance is realized through the first main shaft 11. Taking a fan as an example, the first main shaft 11 is used to provide the air outlet power. The first main shaft 11 is arranged on the front of the biaxial motor 1, and the second main shaft 12 is arranged on the back of the biaxial motor 1. The "front" refers to the side facing the user during use, and the "back" refers to the side facing away from the user during use. Both the first main shaft 11 and the second main shaft 12 are horizontally arranged, and the vertical shaft 2 is perpendicular to the second main shaft 12, that is, the vertical shaft 2 is vertically arranged. A reversing transmission mechanism 4 is connected between the top of the vertical shaft 2 and the second main shaft 12. When the second main shaft 12 rotates, the vertical shaft 2 is driven to rotate along its own axis through the reversing transmission mechanism 4.

[0031] As Figures 1 to 3As shown, the linkage mechanism 3 includes components such as a crank 31, a bushing 32, and a connecting rod 33. One end of the crank 31 is mounted at the bottom end of the vertical shaft 2. The bushing 32 is rotatably mounted on a support rod 34. The two ends of the connecting rod 33 are bent, namely a first end and a second end. The first end of the connecting rod 33 is hingedly connected to the other end of the crank 31, and the second end of the connecting rod 33 is hingedly connected to the edge of the bushing 32. When the vertical shaft 2 rotates, it drives the bushing 32 to reciprocally rotate in a plane perpendicular to the vertical shaft 2, that is, the horizontal plane, through the crank 31 and the connecting rod 33.

[0032] The working process of the linkage mechanism 3 is as follows. When the vertical shaft 2 rotates, it drives the crank 31 to rotate. The first end of the connecting rod 33 follows the crank 31 to rotate around the vertical shaft 2, and the first end gradually approaches or moves away from the bushing 32, thereby pulling the bushing 32 to rotate around its own axis. When the first end of the connecting rod 33 gradually rotates to the limit position away from the bushing 32, the bushing 32 reaches the maximum deflection angle in the first direction. When the first end of the connecting rod 33 gradually rotates to the limit position close to the bushing 32, the bushing 32 reaches the maximum deflection angle in the second direction. The rotation directions of the first direction and the second direction are opposite.

[0033] In the present invention, the double-shaft motor 1 drives the reversing transmission mechanism 4 to transmit power, and then the vertical shaft 2 drives the bushing 32 in the linkage mechanism 3 to reciprocally rotate, so as to achieve large-angle left and right shaking of the head at low cost.

[0034] As Figures 1 to 5 shown, in some embodiments provided by the present invention, the reversing transmission mechanism 4 includes: a worm gear 41, a first reversing gear 42, and a second reversing gear 43. The first reversing gear 42 and the worm gear 41 are coaxially fixed. The first reversing gear 42 and the second reversing gear 43 are meshed, and the axes of the first reversing gear 42 and the second reversing gear 43 are perpendicular to each other. The second reversing gear 43 is coaxially fixed at the top end of the vertical shaft 2. The outer wall of the second main shaft 12 is provided with a thread to form a worm. The worm gear 41 is meshed with the worm. When the worm rotates, it drives the worm gear 41 to rotate. The worm gear 41 drives the first reversing gear 42 to rotate. The first reversing gear 42 drives the second reversing gear 43 to rotate, thereby realizing the conversion of the horizontal rotation of the second main shaft 12 to the vertical rotation of the vertical shaft 2.

[0035] It should be noted that the preferred solution for the reversing gear is to use bevel gears, that is, the first reversing gear 42 is a first bevel gear, and the second reversing gear 43 is a second bevel gear. When the worm rotates, it drives the worm gear 41 to rotate. The worm gear 41 drives the first bevel gear to rotate, and the first bevel gear drives the second bevel gear to rotate, thereby realizing the horizontal rotation of the second main shaft 12 to the vertical rotation of the vertical shaft 2. Of course, in practical applications, the reversing gear can also be a crown gear and a normal gear, etc., that is, the first reversing gear 42 is a normal gear, and the second reversing gear 43 is a crown gear. When the worm rotates, it drives the worm gear 41 to rotate. The worm gear 41 drives the normal gear to rotate, and the normal gear drives the crown gear to rotate, thereby realizing the horizontal rotation of the second main shaft 12 to the vertical rotation of the vertical shaft 2.

[0036] As a further optimization, the bottom end of the vertical shaft 2 is a non-circular driving end, and the crank 31 is provided with a driving hole matching the shape of the non-circular driving end. "Non-circular" means that the driving end can adopt any shape other than circular, such as semi-circular, elliptical, square, etc. The function of this design is to allow the vertical shaft 2 to move up and down along the driving hole, and at the same time, when the vertical shaft 2 rotates along its own axis, it can drive the crank 31 to rotate accordingly. The vertical shaft 2 is connected with a swing switching mechanism 5. The function of the swing switching mechanism 5 is to adjust the height of the vertical shaft 2. When the height of the vertical shaft 2 rises to a certain height, the first reversing gear 42 and the second reversing gear 43 are engaged, and the bushing 32 in the link mechanism 3 reciprocates, and the swing function is turned on. When the height of the vertical shaft 2 drops to a certain height, the first reversing gear 42 and the second reversing gear 43 are disengaged, the link mechanism 3 stops working, the bushing 32 remains stationary, and the swing function is turned off.

[0037] As Figures 1 to 3 shown, in some embodiments provided by the present invention, the swing switching mechanism 5 includes: a protruding portion 51, a spring 52, a push rod 53, and a button assembly. The protruding portion 51 is provided on the side wall of the vertical shaft 2. The spring 52 abuts between the protruding portion 51 and the end face of the crank 31. The push rod 53 is provided on one side of the vertical shaft 2. The push rod 53 is arranged along the radial direction of the vertical shaft 2, and a guiding surface is provided at the end of the push rod 53. When the push rod 53 moves forward along the radial direction of the vertical shaft 2, the guiding surface pushes the protruding portion 51 downward, forcing the spring 52 to be compressed between the protruding portion 51 and the crank 31. After the push rod 53 moves backward along the radial direction of the vertical shaft 2, the spring 52 pushes the protruding portion 51 upward. The forward and backward movement of the push rod 53 is controlled by the button assembly, and the button assembly is operated to control the opening or closing of the swing function.

[0038] It should be understood that the "forward movement" here refers to the push rod 53 moving radially closer to the protrusion 51, and the "backward movement" refers to the push rod 53 moving radially away from the protrusion 51. To make the cooperation between the guiding surface and the protrusion 51 more compact, the guiding surface can be an inclined surface, and the shape of the top edge of the protrusion 51 matches the guiding surface. In addition, the button assembly can be designed for manual pressing operation. Pressing the button assembly pushes the push rod 53 towards the protrusion 51 and locks it. Pressing the button assembly again releases the lock, and the push rod 53 resets during the upward movement of the protrusion 51. The button assembly can adopt any button assembly with a locking effect in the prior art, such as the pressing lock mechanism widely used in ballpoint pens. The present invention does not impose special restrictions on the specific structure of the button assembly.

[0039] As Figure 3 shown, in some embodiments of the present invention, a rear shell 6 is rotatably installed at the top of the support rod 34. The shaft sleeve 32 is provided with a notch 321. An insertion portion located in the notch 321 is provided inside the rear shell 6. When the shaft sleeve 32 rotates, the rear shell 6 is driven to rotate synchronously through the insertion portion. When the shaking head structure is applied to a fan, the support rod 34 is the vertical rod of the fan, and the top of the support rod 34 is covered in the rear shell 6. When the shaft sleeve 32 rotates, the entire rear shell 6 is driven to rotate to achieve large-angle left and right shaking.

[0040] As a further optimization, a cover shell 7 is installed above the rear shell 6. The dual-axis motor 1 is fixedly installed in the cover shell 7. The first main shaft 11 is located on the front of the cover shell 7. A receiving cavity 71 is provided on the back of the cover shell 7. The top of the rear shell 6 is located inside the receiving cavity 71. The rotating shaft of the worm gear 41 is the central shaft. The central shaft movably passes through the rear shell 6 and the receiving cavity 71. The cover shell 7 can rotate around the central shaft to adjust the pitching angle. A positioning structure for locking the pitching angle is provided between the receiving cavity 71 and the rear shell 6.

[0041] Since the present invention uses the rotating shaft of the worm gear 41 as the central shaft, when the dual-axis motor 1 rotates around the central shaft following the rear shell 6, the worm rotates around the worm gear 41 and maintains the meshing relationship. Therefore, the adjustable range of the pitching angle is larger. In actual application, the size of the receiving cavity 71 is designed according to the maximum range required for the pitching angle. The cover shell 7 rotates upward or downward until the top of the rear shell 6 abuts against the receiving cavity 71 to reach the limit angle.

[0042] On this basis, the vertical shaft 2, the second reversing gear 43 and the first reversing gear 42 are all arranged in the rear housing 6. A sliding groove 61 for the worm to pass through is provided on the front surface of the rear housing 6. The sliding groove 61 allows the worm to adjust the pitching angle following the cover housing 7. The components of the shaking head structure are reasonably installed in the rear housing 6 and the cover housing 7 respectively, and the overall shape of the machine is delicate and compact. To improve the rotational stability of the vertical shaft 2, a fixing block 62 is provided in the rear housing 6. The fixing block 62 is provided with a limiting hole, and the vertical shaft 2 passes through the limiting hole movably. In some embodiments of the present invention, the sliding groove 61 extends to the top end of the rear housing 6, and the worm can rotate with the cover housing 7 to the top end of the sliding groove 61, and the cover housing 7 reaches the upward limit angle.

[0043] In some embodiments, the positioning structure includes: an annular portion 63, a positioning hole 72 and a resistance member. An annular portion 63 coaxial with the central axis is provided on the outer wall of the rear housing 6. A positioning hole 72 for accommodating the insertion of the annular portion 63 is provided on the wall of the accommodating cavity 71. The central axis passes through the annular portion 63 movably and extends from the positioning hole 72 into the cover housing 7. The resistance member is clamped between the annular portion 63 and the positioning hole 72, and its function is to provide resistance to limit the rotational movement of the cover housing 7. During actual use, manually adjust the pitching angle of the cover housing 7, and under the action of the resistance member, the cover housing 7 is kept at the current pitching angle.

[0044] It should be noted that the resistance member can adopt a resistance ring, and the surface of the resistance ring can be designed with concave and convex patterns to increase the friction force. This friction force should be able to satisfy that the cover housing 7 remains stationary at any pitching angle without external force, and when manually adjusting, overcome the friction force to push the cover housing 7. Of course, the resistance member can also adopt a positioning rubber ring with positioning teeth. The positioning rubber ring is fixedly sleeved on the annular portion 63. The positioning teeth are arranged circumferentially on the positioning rubber ring. The positioning hole of the positioning teeth is provided with a tooth groove for accommodating the positioning teeth. When manually adjusting, push the cover housing 7. During the rotation of the tooth groove, the positioning teeth are forced to deform until the tooth groove slides to the corresponding position, and the positioning teeth enter the tooth groove and return to the natural state. The cover housing 7 remains stationary under the insertion action of the rack and the tooth groove.

[0045] As Figures 1 to 3 shown, the present invention also proposes a fan adopting the above-mentioned shaking head structure. The first main shaft 11 is connected to the fan blade to drive the rotation of the fan blade. The vertical rod of the fan is the support rod 34. The bottom of the vertical rod is installed with a chassis 8, the top of the vertical rod is installed with a rear housing 6, the button assembly is located on the back of the rear housing 6, and a guard 9 covering the blade is installed on the front of the cover housing 7.

[0046] The working process of the fan is as follows. Operate the button assembly to control the opening or closing of the swinging function. After the button assembly makes the push rod 53 move backward in the radial direction of the vertical shaft 2, the spring 52 pushes the protruding part 51 upward, causing the first reversing gear 42 and the second reversing gear 43 to mesh, and the swinging function is turned on. The worm rotates to drive the worm wheel 41 to rotate. The worm wheel 41 drives the first reversing gear 42 to rotate. The first reversing gear 42 drives the second reversing gear 43 to rotate, changing the horizontal rotation of the second main shaft 12 to the vertical rotation of the vertical shaft 2. The rotation of the vertical shaft 2 drives the crankshaft 31 to rotate. The first end of the connecting rod 33 follows the crank 31 to rotate around the vertical shaft 2, gradually approaching or moving away from the bushing 32, thereby pulling the bushing 32 to rotate around its own axis. The rotation of the bushing 32 drives the rear housing 6 to rotate synchronously, and the rear housing 6 then drives the cover housing 7 to rotate left and right synchronously. When adjusting the pitching angle, manually adjust the pitching angle of the cover housing 7. While the cover housing 7 rotates around the central axis, the worm rotates around the worm wheel 41 and maintains the meshing relationship. Just release the hand after the adjustment is completed, and the cover housing 7 is kept at the current pitching angle under the action of the positioning structure.

[0047] The present invention designs a dual-axis motor, a reversing transmission mechanism, and a connecting rod mechanism to achieve large-angle left and right swinging of the fan at low cost. On this basis, by setting the pitching rotation axis on the rotating shaft of the worm wheel, large-angle pitching adjustment of the fan is realized, and the fan can send air in all directions, effectively solving the defects of insufficient air supply angle and too high cost in the prior art.

[0048] Although many terms are used in this article, the possibility of using other terms is not excluded. For example, the orientation or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. Using these terms is only to more conveniently describe and explain the essence of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Interpreting them as any additional limitation is contrary to the spirit of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0049] The specific embodiments described herein are only examples of the present invention. Those skilled in the art of the present invention can modify or supplement the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A shaking head structure, characterized in that, Comprising: A dual-axis motor having a first main shaft and a second main shaft, wherein the first main shaft is used to provide working power; A vertical shaft perpendicular to the second main shaft, with a reversing transmission mechanism connected between the top end of the vertical shaft and the second main shaft. When the second main shaft rotates, the vertical shaft is driven to rotate along its own axis through the reversing transmission mechanism; A link mechanism having a crank mounted at the bottom end of the vertical shaft, a bushing rotatably mounted at the top end of a support rod, and a link hinged between the crank and the bushing. When the vertical shaft rotates, the bushing is driven to reciprocally rotate in a plane perpendicular to the vertical shaft through the crank and the link; The reversing transmission mechanism includes: a worm gear, a first reversing gear coaxially fixed with the worm gear, and a second reversing gear meshing with the first reversing gear. The axes of the first reversing gear and the second reversing gear are perpendicular to each other. The second reversing gear is coaxially fixed at the top end of the vertical shaft, and the outer wall of the second main shaft is provided with a thread to form a worm engaging with the worm gear; The top of the support rod is rotatably mounted with a rear shell. The bushing is provided with a notch, and the rear shell is provided with a plugging portion located in the notch. When the bushing rotates, the rear shell is driven to rotate synchronously through the plugging portion. A cover shell is mounted above the rear shell, and the dual-axis motor is mounted in the cover shell. The first main shaft extends out of the front of the cover shell, and a receiving cavity is provided on the back of the cover shell. The top of the rear shell is located in the receiving cavity; The rotating shaft of the worm gear is a central shaft, and the central shaft movably passes through the rear shell and the receiving cavity. The cover shell can rotate around the central shaft to adjust the pitch angle, and a positioning structure for locking the pitch angle is provided between the receiving cavity and the rear shell.

2. The shaking head structure according to claim 1, wherein The first reversing gear is a first bevel gear, and the second reversing gear is a second bevel gear.

3. The shaking head structure according to claim 2, wherein, The bottom end of the vertical shaft is a non-circular transmission end, and the crank is provided with a transmission hole matching the shape of the non-circular transmission end. The non-circular transmission end movably passes through the transmission hole, and the vertical shaft is connected with a shaking head switching mechanism for adjusting its height to engage or disengage the first bevel gear and the second bevel gear.

4. The head-shaking structure according to claim 3, wherein The shaking head switching mechanism includes: a ring of protruding portions provided on the side wall of the vertical shaft, a spring abutted between the protruding portions and the crank, a push rod provided on one side of the vertical shaft and with its end close to the protruding portions, and a button assembly for controlling the forward and backward movement of the push rod. The end of the push rod is provided with a guiding surface, and the guiding surface pushes the protruding portion downward when the push rod moves forward, and the spring pushes the protruding portion upward when the push rod moves backward.

5. The shaking head structure according to claim 1, characterized in that The positioning structure includes: an annular portion provided on the outer wall of the rear shell and coaxially arranged with the central shaft, a positioning hole provided on the wall of the receiving cavity for receiving the annular portion to be inserted, and a resistance member clamped between the annular portion and the positioning hole. The central shaft movably passes through the annular portion and extends from the positioning hole into the cover shell.

6. The shaking head structure according to claim 2, characterized in that The vertical shaft, the second bevel gear, and the first bevel gear are all disposed in the rear housing. A chute for the worm to pass through is provided on the front surface of the rear housing, and the chute allows the worm to adjust the pitching angle following the cover housing.

7. Fan, characterized in that, The fan adopts the shaking head structure according to any one of claims 1 to 6.

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