Industrial floor fan

Abstract

The application relates to the technical field of fans, and particularly discloses an industrial prone fan, which comprises a fan outer frame, a fan frame support, a blowing assembly and a swinging assembly, the fan outer frame comprises a first fan frame, the fan frame support comprises a first support and a second support, the first support is fixedly connected with the first fan frame, the second support is hingedly connected with the first support to rotate around a first axis, the blowing assembly comprises a fan blade and a driving motor, an outer wall of the driving motor is hingedly connected with the second support to rotate around a second axis, the first axis is perpendicular to the second axis, the swinging assembly comprises a positioning rotating shaft, a crank and a swinging motor, the swinging motor is fixedly arranged on one side of a shell of the driving motor away from the fan blade, an output shaft of the swinging motor is fixedly connected with one end of the crank, the other end of the crank is hingedly connected with the first support through the positioning rotating shaft, and the crank acts on the swinging motor when the swinging motor drives the crank to rotate. The application has the effect of improving the small air supply coverage of the conventional industrial prone fan in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of fans, and in particular to an industrial floor fan. Background Technology

[0002] Industrial floor fans are typically used for powerful ventilation and cooling in industrial settings. The fan head is close to the ground and equipped with a high-power motor and large-diameter blades, providing a large air volume and long air delivery distance. They are suitable for ventilation, cooling, dehumidification, or floor drying in workshops, warehouses, logistics centers, and farms.

[0003] In existing technologies, industrial floor fans typically lack oscillation functionality. A few floor fans only offer small left-right reciprocating oscillations, with the oscillation angle limited to the 90-120 degree range, resulting in limited airflow coverage. Some floor fans can only achieve a horizontal 180-degree half-circle oscillation, leading to significant blind spots in airflow. When used in large factories or open warehouses, multiple fans are required to achieve full-area air circulation, resulting in high equipment purchase and electricity costs. Summary of the Invention

[0004] To address the issue of limited airflow coverage in traditional industrial floor fans, this application provides an industrial floor fan.

[0005] The industrial floor-mounted fan provided in this application adopts the following technical solution: An industrial floor-standing fan includes: The fan frame, including the first fan frame; The fan frame support includes a first support and a second support. The first support is fixedly connected to the first fan frame, and the second support is hinged to the first support to rotate about a first axis. A blower assembly includes fan blades and a drive motor, the outer wall of which is hinged to the second bracket to rotate about a second axis, the first axis being perpendicular to the second axis; The oscillating assembly includes a positioning shaft, a crank, and an oscillating motor. The oscillating motor is fixedly mounted on the side of the drive motor housing away from the fan blades. The output shaft of the oscillating motor is fixedly connected to one end of the crank, and the other end of the crank is hinged to the first bracket through the positioning shaft, so that when the oscillating motor drives the crank to rotate, the crank reacts to the oscillating motor.

[0006] By adopting the above technical solution, the fixed first fan frame provides a fixed motion reference for the swing mechanism, ensuring that the blower assembly does not drive the first fan frame to move when swinging, thus ensuring the overall stability of the fan and forming a stable air duct boundary to ensure the organization and output of the airflow. The first bracket provides a fixed support point for the hinge of the second bracket and the hinge of the positioning shaft. The second bracket provides two mutually perpendicular swing degrees of freedom for the drive motor and fan blades, allowing the drive motor axis to trace a conical trajectory in space, expanding the air delivery coverage and improving the problem of small air delivery coverage in traditional industrial floor fans in the prior art. The swing motor drives the drive motor and fan blades to swing in a similar conical shape through the reaction force of the crank. When the swing motor drives the crank to rotate, the other end of the crank is constrained by the positioning shaft, and the drive motor axis traces a conical trajectory in space, thereby reacting the force to the swing motor and transmitting it to the drive motor housing, pushing the drive motor and fan blades to swing in a similar conical shape, thus expanding the air delivery coverage.

[0007] Preferably, the first axis is a vertical axis so that the second bracket can rotate horizontally about the first axis relative to the first fan frame, and the second axis is a horizontal axis so that the drive motor can rotate vertically about the second axis relative to the first fan frame.

[0008] By adopting the above technical solution, the first axis is a vertical axis, which causes the second bracket to drive the blower assembly to oscillate left and right in the horizontal plane. The second axis is a horizontal axis, which causes the drive motor to drive the fan blades to pitch up and down in the vertical plane. The blower assembly can simultaneously oscillate horizontally and pitch up and down. The fan blade axis can draw a three-dimensional trajectory in space, reducing the air supply blind spot in the three-dimensional space and improving the problem of small air supply coverage of traditional industrial floor fans in the prior art.

[0009] Preferably, the first sector frame is annular and vertically arranged, the first bracket is arc-shaped and vertically arranged, and the centers of the two coincide. The top and bottom of the first bracket are fixedly connected to the top and bottom of the first sector frame, respectively. The second bracket is annular and vertically arranged, and its center coincides with that of the first bracket. The top and bottom of the second bracket are hinged to the top and bottom of the first bracket, respectively, through vertical pins to form the first axis. The two sides of the drive motor are hinged to the two sides of the second bracket through horizontal hinges to form the second axis.

[0010] By adopting the above technical solution, a mounting hole is opened in the middle of the first fan frame, and the first bracket is fixed at two points, making the first axis vertical and passing through the center of the fan frame. Since the first bracket is concentric with the fan frame, when the second bracket rotates around the vertical axis, the center of rotation coincides with the center of the fan frame, avoiding eccentric swaying. The arc-shaped structure ensures support rigidity while reducing obstruction of airflow. When the second bracket rotates around the vertical axis, the ring structure is symmetrical, the mass distribution is uniform, the moment of inertia is small, and the horizontal swaying is stable. A drive motor is installed inside the ring, allowing the drive motor and fan blades to pitch around the horizontal axis. The second bracket is concentric with the first bracket, ensuring that the vertical axis and the horizontal axis intersect at the center.

[0011] Preferably, the swing motor is a servo motor.

[0012] By adopting the above technical solution, when the oscillating motor drives the crank to rotate, the other end of the crank is constrained by the positioning shaft. The crank reacts on the oscillating motor, causing the drive motor and fan blades to oscillate. Since the servo motor can change the rotation angle and speed of the crank, the oscillation angle and oscillation speed of the fan blades can also be changed.

[0013] Preferably, the fan outer frame further includes a second fan frame and a base frame. The second fan frame is detachably connected to the first fan frame. The base frame is a U-shaped support frame. A limiting slot is provided on the base frame. Through holes are provided on both sides of the first fan frame. The limiting slot is opposite to the through holes. A fastening knob passes through the through holes and is restricted within the limiting slot to limit the pitch angle of the first fan frame relative to the base frame.

[0014] By adopting the above technical solution, the second fan frame can form a complete external structure of the fan together with the first fan frame. The base frame can be connected to the two sides of the first fan frame from both sides, so that the fan head is kept at a certain height off the ground, while providing sufficient support width to prevent the fan from tipping over during operation or pitch adjustment. The through hole is opposite to the limit slot, and the fastening knob passes through the through hole and is restricted in the slot, so that the first fan frame and the base frame can be adjusted relative to each other and can be locked and fixed by the fastening knob.

[0015] Preferably, the limiting slot is an arc-shaped long slot, and the base frame is provided with a limiting boss on one side of the limiting slot to limit the maximum pitch angle of the first sector frame.

[0016] By adopting the above technical solution, the arc-shaped groove allows the first frame to pitch continuously within a certain angle range relative to the base frame. The fastening knob can be locked at any position within the arc-shaped groove, realizing stepless adjustment of the pitch angle. When the first frame drives the fastening knob to slide to the limit position along the arc-shaped groove, the corresponding part of the first frame abuts against the limiting boss, preventing it from continuing to move, thereby limiting the pitch angle within a safe range, preventing excessive downward collision with the ground, or preventing excessive upward tilting that could cause a shift in the center of gravity.

[0017] Preferably, the fan frame further includes a protective cover, which is fixed to the side of the first fan frame away from the fan blades. A cavity for accommodating the fan frame support is formed between the protective cover and the first fan frame. A plug-in groove is provided on the back of the protective cover for engaging with a speed controller.

[0018] By adopting the above technical solution, the protective cover is fixed on the side of the first fan frame away from the fan blades, that is, the back of the fan. A cavity is formed between the protective cover and the first fan frame, which semi-encloses the oscillating component and the fan frame support and other structures in the cavity, thereby reducing the intrusion of dust, oil and / or foreign objects into the internal mechanism and reducing the risk of collision damage.

[0019] Preferably, the speed controller is detachably installed in the insertion slot via a snap-fit ​​mechanism.

[0020] By adopting the above technical solution, the speed controller is clipped onto the protective cover and no longer needs to be independently suspended externally. The wiring routing is clear, and operators can directly adjust the speed from the back of the fan. The detachable design allows for quick removal and replacement or repair of the speed controller when it is damaged, without disassembling the entire machine. This improves operational convenience, facilitates maintenance and replacement, and reduces the risk of loose wiring or safety hazards caused by improper speed controller mounting.

[0021] Preferably, the protective cover also has a cable inlet hole for the power cord and the connecting wire of the speed controller to enter the protective cover.

[0022] By adopting the above technical solution, the protective cover guides the cable inside, placing the cable and terminals within a relatively enclosed cavity, avoiding direct exposure to dust, oil, and mechanical impact in industrial environments. Simultaneously, the protective cover serves as a carrier for the cable inlet, providing a fixed routing position for the cable.

[0023] In summary, this application includes at least one of the following beneficial technical effects: The fixed first fan frame provides a fixed motion reference for the oscillating mechanism, ensuring that the blower assembly does not move the first fan frame during oscillation, thus ensuring the overall stability of the fan and forming a stable air duct boundary to ensure the organization and output of the airflow. The first bracket provides a fixed support point for the hinge of the second bracket and the hinge of the positioning shaft. The second bracket provides two mutually perpendicular oscillation degrees of freedom for the drive motor and fan blades, allowing the drive motor axis to trace a conical trajectory in space, expanding the air delivery coverage and improving the problem of small air delivery coverage in traditional industrial floor fans in the prior art. The oscillation motor drives the drive motor and fan blades to oscillate in a conical shape through the reaction force of the crank. When the oscillation motor drives the crank to rotate, the other end of the crank is constrained by the positioning shaft, and the drive motor axis traces a conical trajectory in space, thereby reacting the force to the oscillation motor and transmitting it to the drive motor housing, pushing the drive motor and fan blades to oscillate in a conical shape, thus expanding the air delivery coverage. The first axis is a vertical axis, which causes the second bracket to drive the blower assembly to oscillate left and right in the horizontal plane. The second axis is a horizontal axis, which causes the drive motor to drive the fan blades to pitch up and down in the vertical plane. The blower assembly can simultaneously oscillate horizontally and pitch up and down. The fan blade axis can draw a three-dimensional trajectory in space, reducing the air delivery blind spot in the three-dimensional space and improving the problem of small air delivery coverage of traditional industrial floor fans in the existing technology. When the oscillating motor drives the crank to rotate, the other end of the crank is constrained by the positioning shaft. The crank reacts on the oscillating motor, causing the drive motor and fan blades to oscillate. Since the servo motor can change the rotation angle and speed of the crank, the oscillation angle and speed of the fan blades can also be changed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the industrial floor fan in the embodiments of this application; Figure 2 This is a side view of the industrial floor fan in an embodiment of this application; Figure 3 This is a schematic diagram of the fan outer frame in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the protective cover in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the sector frame bracket in the embodiments of this application; Figure 6 This is a schematic diagram of the swing component in the embodiments of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Fan outer frame; 11. First fan frame; 12. Second fan frame; 13. Base frame; 14. Protective cover; 15. Plug-in slot; 16. Speed ​​controller; 17. Fastening knob; 18. Mounting hole; 2. Fan frame bracket; 21. First bracket; 22. Second bracket; 23. First axis; 24. Second axis; 3. Blower assembly; 31. Fan blade; 32. Drive motor; 4. Oscillating assembly; 41. Positioning shaft; 42. Crank; 43. Oscillating motor. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 To be continued Figure 6 This application will be described in further detail.

[0027] This application discloses an industrial floor-standing fan. (Refer to...) Figure 1 and Figure 2 The industrial floor fan includes a fan frame 1, a fan frame bracket 2, a blower assembly 3, and an oscillation assembly 4.

[0028] like Figure 3 As shown, the fan outer frame 1 includes a first fan frame 11, a second fan frame 12, a base frame 13, and a protective cover 14. The first fan frame 11 and the second fan frame 12 are detachably connected by means including but not limited to snap-fit ​​or bolt connection. The base frame 13 is a U-shaped support frame with a limiting slot. The first fan frame 11 has through holes on both sides, and the limiting slot is opposite to the through holes. The fastening knob 17 passes through the through holes and is confined within the limiting slot to limit the pitch of the first fan frame 11 relative to the base frame 13. At an angle, the second fan frame 12 can form a complete external structure of the fan together with the first fan frame 11. The base frame 13 can be connected to the two sides of the first fan frame 11 from both sides, so that the fan head is kept at a certain height off the ground, while providing sufficient support width to prevent the fan from tipping over during operation or pitch adjustment. The through hole is opposite to the limit slot, and the fastening knob 17 passes through the through hole and is restricted in the slot, so that the first fan frame 11 and the base frame 13 can be adjusted relative to each other and can be locked and fixed by the fastening knob 17.

[0029] For example, the limiting slot is an arc-shaped elongated slot. The base frame 13 has a limiting boss on one side of the limiting slot to limit the maximum pitch angle of the first sector frame 11. The arc-shaped elongated slot allows the first sector frame 11 to pitch continuously relative to the base frame 13 within a certain angle range. The fastening knob 17 can be locked at any position within the arc-shaped slot, realizing stepless adjustment of the pitch angle. When the first sector frame 11 drives the fastening knob 17 to slide to the limit position along the arc-shaped elongated slot, the corresponding part of the first sector frame 11 abuts against the limiting boss, preventing it from continuing to move, thereby limiting the pitch angle within a safe range, preventing excessive downward collision with the ground, or preventing excessive upward tilting that could cause a shift in the center of gravity. It should be noted that the limiting structure formed by the limiting slot, the limiting boss, and the fastening knob 17 is prior art and can be replaced by any existing limiting structure as long as it can achieve the adjustment and limitation of the pitch angle. This application will not elaborate on this.

[0030] like Figure 4 As shown, the protective cover 14 is fixed to the side of the first fan frame 11 away from the fan blade 31. A cavity for accommodating the fan frame support 2 is formed between the protective cover 14 and the first fan frame 11. A plug-in groove 15 is provided on the back of the protective cover 14. The plug-in groove 15 is used to engage with the speed controller 16. The speed controller 16 is detachably installed in the plug-in groove 15 by a snap-fit. The protective cover 14 is fixed to the side of the first fan frame 11 away from the fan blade 31, i.e. the back of the fan. The cavity formed between the protective cover 14 and the first fan frame 11 semi-encloses the oscillating component 4 and the fan frame support 2 and other structures in the cavity, thereby reducing the intrusion of dust, oil and / or foreign objects into the internal mechanism and reducing the risk of collision damage.

[0031] In this embodiment, the protective cover 14 is bowl-shaped, and its outer wall has several heat dissipation holes. The speed controller 16 is snapped onto the protective cover 14 and is no longer independently suspended externally. The wiring routing is clear, and the operator can directly adjust the speed from the back of the fan. The detachable design allows the speed controller 16 to be quickly removed for replacement or repair when damaged, without disassembling the entire machine, improving operational convenience, facilitating maintenance and replacement, and reducing the risk of loose wiring or safety hazards caused by improper fixing of the speed controller 16.

[0032] For example, the protective cover 14 also has a cable inlet hole for the power cord and the connection cable of the speed controller 16 to enter the protective cover 14. The protective cover 14 guides the cable into the interior, so that the cable and the terminal block are located in a relatively enclosed cavity, avoiding direct exposure to dust, oil and mechanical impact in the industrial environment. At the same time, the protective cover 14, as the carrier of the cable inlet hole, provides a fixed routing position for the cable.

[0033] like Figure 5 and Figure 6As shown, the first fan frame 11 has a mounting hole 18. The fan frame bracket 2 is disposed at the mounting hole 18 of the first fan frame 11. The fan frame bracket 2 includes a first bracket 21 and a second bracket 22. The first bracket 21 is fixed at the mounting hole 18 and extends at least partially into the cavity between the protective cover 14 and the first fan frame 11. The first bracket 21 is fixedly connected to the first fan frame 11. The second bracket 22 is hinged to the first bracket 21 to rotate around the first axis 23. The blower assembly 3 includes a fan blade 31 and a drive motor 32. The outer wall of the drive motor 32 is connected to the second bracket 22. The frame 22 is hinged to rotate about the second axis 24. The first axis 23 is perpendicular to the second axis 24. The swing assembly 4 includes a positioning shaft 41, a crank 42 and a swing motor 43. The swing motor 43 is fixedly mounted on the side of the housing of the drive motor 32 away from the fan blade 31 by a metal bracket. The output shaft of the swing motor 43 is fixedly connected to one end of the crank 42. The other end of the crank 42 is hinged to the first bracket 21 by the positioning shaft 41 so that when the swing motor 43 drives the crank 42 to rotate, the crank 42 reacts to the swing motor 43.

[0034] In this embodiment, the first sector frame 11 is annular and vertically arranged, and the first bracket 21 is arc-shaped and vertically arranged. The opening of the first bracket 21 faces the second bracket 22, and their centers coincide. The top and bottom of the first bracket 21 are fixedly connected to the top and bottom of the first sector frame 11, respectively. The second bracket 22 is annular and vertically arranged, and its center coincides with that of the first bracket 21. The inner diameter of the second bracket 22 is smaller than that of the first bracket 21. The top and bottom of the second bracket 22 are hinged to the top and bottom of the first bracket 21, respectively, through vertical pins to form a first axis 23. The two sides of the drive motor 32 are hinged to the two sides of the second bracket 22 through horizontal hinges to form a second axis 24.

[0035] For example, a mounting hole 18 is provided in the middle of the first fan frame 11, and the first bracket 21 is fixed at two points, making the first axis 23 vertical and passing through the center of the fan frame. Since the first bracket 21 is concentric with the fan frame, when the second bracket 22 rotates around the vertical axis, the center of rotation coincides with the center of the fan frame, avoiding eccentric swaying. The arc-shaped structure ensures support rigidity while reducing obstruction of airflow. When the second bracket 22 rotates around the vertical axis, the annular structure is symmetrical, the mass distribution is uniform, the moment of inertia is small, and the horizontal swaying is stable. The second bracket 22 is concentric with the first bracket 21, ensuring that the first axis 23 and the second axis 24 intersect at the center.

[0036] In this embodiment, the fixed first fan frame 11 provides a fixed motion reference for the swing mechanism, ensuring that the blower assembly 3 does not move the first fan frame 11 during swing, thus ensuring the overall stability of the fan and forming a stable air duct boundary to ensure the organization and output of the airflow. The first bracket 21 provides a fixed support point for the hinge of the second bracket 22 and the hinge of the positioning shaft 41. The second bracket 22 provides two mutually perpendicular swing degrees of freedom for the drive motor 32 and the fan blades 31, allowing the axis of the drive motor 32 to trace a conical trajectory in space, expanding the air delivery coverage and improving the problem of small air delivery coverage in traditional industrial floor fans in the prior art. The swing motor 43 drives the drive motor 32 and the fan blades 31 to swing in a conical shape through the reaction force of the crank 42. An angle of five to fifteen degrees is set between the axis of the crank 42 and the axis of the positioning shaft 41. The crank 42 is made of thermoplastic polyester elastomer or thermoplastic polyurethane with elastic deformation capability, or there is a gap of 0.5 mm to 1.5 mm between the crank 42 and the positioning shaft 41 to allow the crank 42 to tilt. When the oscillating motor 43 drives the crank 42 to rotate, the other end of the crank 42 is constrained by the positioning shaft 41, and the axis of the drive motor 32 traces a conical trajectory in space, thereby reacting the force to the oscillating motor 43, and transmitting it to the housing of the drive motor 32 through the oscillating motor 43, pushing the drive motor 32 and the fan blade 31 to oscillate in a similar conical shape, thus expanding the air delivery coverage area.

[0037] For example, lubricating oil is applied between the crank 42 and the positioning shaft 41. The oscillating motor 43 is a servo motor. When the oscillating motor 43 drives the crank 42 to rotate, the other end of the crank 42 is constrained by the positioning shaft 41. The crank 42 reacts to the oscillating motor 43, causing the drive motor 32 and the fan blade 31 to oscillate. Since the servo motor can change the movement speed of the crank 42, the oscillation speed of the fan blade 31 can also be changed.

[0038] like Figure 6 As shown, the first axis 23 is a vertical axis, allowing the second bracket 22 to rotate horizontally relative to the first fan frame 11 around the first axis 23. The second axis 24 is a horizontal axis, allowing the drive motor 32 to rotate vertically relative to the first fan frame 11 around the second axis 24. The first axis 23 being a vertical axis allows the second bracket 22 to drive the blower assembly 3 to oscillate left and right in the horizontal plane. The second axis 24 being a horizontal axis allows the drive motor 32 to drive the fan blades 31 to pitch up and down in the vertical plane. The blower assembly 3 can simultaneously oscillate horizontally and pitch up and down, and the axis of the fan blades 31 can trace a three-dimensional trajectory in space, reducing the air delivery blind spot in the three-dimensional space and improving the problem of small air delivery coverage of traditional industrial floor fans in the prior art.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An industrial floor-standing fan, characterized in that, include: The fan outer frame (1) includes the first fan frame (11); The fan frame support (2) includes a first support (21) and a second support (22). The first support (21) is fixedly connected to the first fan frame (11), and the second support (22) is hinged to the first support (21) to rotate about a first axis (23). The blower assembly (3) includes a fan blade (31) and a drive motor (32), the outer wall of which is hinged to the second bracket (22) to rotate about a second axis (24), the first axis (23) being perpendicular to the second axis (24); The oscillating assembly (4) includes a positioning shaft (41), a crank (42), and an oscillating motor (43). The oscillating motor (43) is fixedly mounted on the side of the housing of the drive motor (32) away from the fan blade (31). The output shaft of the oscillating motor (43) is fixedly connected to one end of the crank (42). The other end of the crank (42) is hinged to the first bracket (21) through the positioning shaft (41) so that when the oscillating motor (43) drives the crank (42) to rotate, the crank (42) reacts to the oscillating motor (43).

2. The industrial floor fan according to claim 1, characterized in that: The first axis (23) is a vertical axis so that the second bracket (22) can rotate in the horizontal direction about the first axis (23) relative to the first fan frame (11), and the second axis (24) is a horizontal axis so that the drive motor (32) can rotate in the vertical direction about the second axis (24) relative to the first fan frame (11).

3. The industrial floor fan according to claim 2, characterized in that: The first fan frame (11) is circular and vertically arranged, and the first bracket (21) is arc-shaped and vertically arranged. The centers of the two coincide. The top and bottom of the first bracket (21) are fixedly connected to the top and bottom of the first fan frame (11) respectively. The second bracket (22) is circular and vertically arranged, and coincides with the center of the first bracket (21). The top and bottom of the second bracket (22) are hinged to the top and bottom of the first bracket (21) respectively through vertical pins to form the first axis (23). The two sides of the drive motor (32) are hinged to the two sides of the second bracket (22) through horizontal hinges to form the second axis (24).

4. The industrial floor fan according to claim 3, characterized in that: The swing motor (43) is a servo motor.

5. The industrial floor fan according to claim 1, characterized in that: The fan outer frame (1) also includes a second fan frame (12) and a base frame (13). The second fan frame (12) is detachably connected to the first fan frame (11). The base frame (13) is a U-shaped support frame. A limiting slot is provided on the base frame (13). Through holes are provided on both sides of the first fan frame (11). The limiting slot is opposite to the through hole. The fastening knob (17) passes through the through hole and is restricted in the limiting slot to limit the pitch angle of the first fan frame (11) relative to the base frame (13).

6. The industrial floor fan according to claim 5, characterized in that: The limiting slot is an arc-shaped long slot, and the base frame (13) is provided with a limiting boss on one side of the limiting slot to limit the maximum pitch angle of the first sector frame (11).

7. The industrial floor fan according to claim 1, characterized in that: The fan frame (1) also includes a protective cover (14), which is fixed to the side of the first fan frame (11) away from the fan blade (31). A cavity for accommodating the fan frame bracket (2) is formed between the protective cover (14) and the first fan frame (11). A plug-in groove (15) is provided on the back of the protective cover (14), which is used to engage with the speed controller (16).

8. The industrial floor fan according to claim 7, characterized in that: The speed controller (16) is detachably installed in the plug slot (15) by means of a snap fastener.

9. The industrial floor fan according to claim 8, characterized in that: The protective cover (14) is also provided with a wire inlet hole, which is used to allow the power cord and the connection wire of the speed controller (16) to enter the protective cover (14).

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