Cooling fan uses a U-shaped electric actuator with telescopic positioning and locking function

Abstract

This utility model discloses a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan. The push rod includes a U-shaped electric push rod with a position locking device installed on its moving parts. The retracted and extended states of the U-shaped electric push rod can be locked by the position locking device, avoiding the adverse effects of excessively short or long extension / retraction on the cooling and dust removal effects of the dust removal reverse fan device. This achieves precise positioning of the blade angle of the dust removal reverse fan device. During normal operation, the blades are ensured to be at the optimal cooling angle; during temporary reverse operation, the blades are ensured to be at the optimal dust removal angle. The blade angle is locked in both states by the position locking device, preventing blade angle deflection under engine vibration. This effectively improves the dust removal and cooling effects of the dust removal reverse fan device and enhances engine efficiency.

Description

Technical Field

[0001] This utility model relates to the field of engine cooling fan technology, specifically to a U-shaped electric push rod for a cooling fan with telescopic positioning and locking function. Background Technology

[0002] In agricultural and construction machinery, the common solution for dust accumulation on engine radiators is to use a dust removal reverse fan device. This device can promptly remove dust from the radiator, and the dust removal process simultaneously cools the radiator without affecting its working efficiency. It is very suitable for use in radiators of various power systems, especially for special vehicles such as loaders, excavators, forklifts, and harvesters, to solve the problem of high engine temperature, remove radiator dust, and improve engine power.

[0003] Such a dust removal reverse fan device is disclosed in patent document CN208220879U, entitled "A Reverse Fan Device for Heat Dissipation and Dust Removal". Another dust removal reverse fan device is disclosed in patent document CN206785480U, entitled "A New Type of Automatic Dust Removal Reverse Fan Device for Water Tanks". Both devices can be driven by steel wire. This method is prone to the phenomenon of steel wire loosening after long-term use, resulting in insufficient tension. This can cause the fan blades to not be fully in the reverse direction, reducing the fan's heat dissipation and dust removal efficiency, and leading to a decrease in engine working efficiency.

[0004] Based on the above problems, some companies have adopted U-shaped electric linear actuators to replace steel wires for drive. This solves the problem of insufficient driving force caused by loose drive mechanism after prolonged use. Typical U-shaped electric linear actuators consist of an electric motor connected to a gearbox, which in turn connects to a lead screw extension mechanism. This type of U-shaped electric linear actuator is a common product on the market, and its specific structure is as follows: Figure 1 As shown, the central rotating shaft of the dust removal reverse fan device 100 is connected to the mechanical power drive rotating shaft 200 on the right side. The mechanical power drive rotating shaft 200 is installed in the frame mounting base 300. The support rod 400 is fixed to the frame mounting base 300, the fulcrum rod 500 is fixed to the support rod 400, and the large shift fork 600 is rotatably connected to the fulcrum rod 500. The semi-circular fork head of the large shift fork 600 is rotatably connected to the outer surface of the bearing on the dust removal reverse fan device 100 on the left and right sides. The two ends of the U-shaped electric push rod 1000 are rotatably connected to the tail end of the large shift fork 600 and the tail end of the support rod 400 respectively through a hinge mechanism.

[0005] Figure 2 The structure of the existing U-shaped electric actuator 1000 has been disclosed. Figure 3 It was made public. Figure 2 The structure of the gearbox 21 in the U-shaped electric actuator 1000 is as follows: Figure 2 In the motor, a stator 12 and a rotor 11 are included. The rotor 11 is connected to a first main shaft 22 of a gearbox 21. The first main shaft 22 has a toothed groove 221 that meshes with a first large gear 232 fixedly mounted on a second main shaft. A first small gear 231 is also fixedly mounted on the second main shaft, which is mounted on a second mounting base 23. The first small gear 231 meshes with a second large gear 241 fixedly mounted on a third main shaft. A second small gear 242 is also fixedly mounted on the third main shaft, which is mounted on a third mounting base 24. The second small gear 242 meshes with a third large gear 251 fixedly mounted on a fourth main shaft, which is mounted on a fourth mounting base 25. Mounting base 23, third mounting base 24, and fourth mounting base 25 are all installed on the inner wall of the gearbox housing. The fourth main shaft is connected to the lead screw 35 of the lead screw extension device. A threaded sleeve 33 is installed on the lead screw 35. The threaded sleeve 33 is provided with a sliding retainer. The threaded sleeve 33 is installed inside the lead screw extension device housing 31. The sliding retainer is installed in the sliding groove 32 on the inner wall of the lead screw extension device housing 31. The lead screw extension device housing 31 is installed on the gearbox 21 and is located on the right side of the gearbox along with the motor. The right side of the threaded sleeve 33 is connected to the telescopic rod 34. The telescopic rod 34 is hollow inside and fitted onto the lead screw 35. The telescopic rod 34 passes through the telescopic through hole on the right side of the lead screw extension device housing 31 and is exposed outside the lead screw extension device housing 31.

[0006] As can be clearly seen from the above introduction, the motor and the lead screw extension are both located on the same side of the gearbox, thus forming a U-shaped structure. The purpose of this is to save space, so that this U-shaped electric actuator can be applied to more confined spaces, such as the dust removal reverse fan device on agricultural diesel harvesters, to drive the blades of the dust removal reverse fan device to achieve forward and reverse rotation. Thus, the U-shaped electric actuator can better adapt to actual application scenarios.

[0007] However, this driving method using a U-shaped electric actuator also has positioning problems during the movement of the telescopic rod 34 in actual use. Excessive or insufficient extension / retraction can negatively impact the blade positioning of the dust removal reverse fan device. Furthermore, the lack of a locking function in the mechanical components during engine vibration can cause changes in the blade angle, meaning that the dust removal and heat dissipation effects of the dust removal reverse fan device cannot reach their optimal state. Therefore, for this reason, it is necessary to propose a new type of U-shaped electric actuator that incorporates a telescopic positioning and locking function. Summary of the Invention

[0008] This invention overcomes the shortcomings of the prior art and provides a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0009] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan, comprising a U-shaped electric push rod, wherein a position locking device is installed on the moving part of the U-shaped electric push rod.

[0010] Preferably, the position locking device is fixed to the non-moving part of the U-shaped electric push rod.

[0011] Preferably, the U-shaped electric actuator includes a motor connected to a gearbox, the gearbox being connected to a lead screw extension device, and the motor and the lead screw extension device being arranged on the same side of the gearbox to form a U-shaped structure.

[0012] Preferably, a position locking device is installed on the motor shaft or its extension shaft.

[0013] Preferably, the motor shaft extends out of the motor housing, and the position locking device is fixed to the outer side of the motor housing.

[0014] Preferably, the position locking device is located on the right side of the motor rotor and is fixed inside the motor housing.

[0015] Preferably, a position locking device is installed on the shaft of the gearbox gear or its extension shaft.

[0016] Preferably, a position locking device is installed on the rotating shaft or its extension shaft of the lead screw telescoping device.

[0017] Preferably, the position locking device is a braking device.

[0018] Preferably, the braking device is an electromagnetic power-off brake.

[0019] Preferably, the telescopic rod of the lead screw telescopic device is equipped with a position locking device.

[0020] Preferably, the position locking device is fixed to the screw extension housing or the motor housing.

[0021] Preferably, the position locking device is a brake.

[0022] Preferably, the telescopic rod is provided with at least two telescopic rod ball hole slots arranged in the left and right directions, and the brake is an elastic ball seat. The elastic ball seat includes a brake seat, and the brake seat is provided with a spring-embedded hole. The spring-embedded hole is provided with a pressure spring and a brake ball in contact with the pressure spring in sequence from the inside to the outside. The brake ball can slide into the telescopic rod ball hole slot during the extension of the telescopic rod.

[0023] Preferably, the telescopic rod has at least two telescopic rod insertion holes arranged in a left-right pattern. A brake is installed at the corresponding position of the telescopic rod insertion hole. The brake is a first electromagnetic pin, which matches the telescopic rod insertion hole and can be inserted into the telescopic rod insertion hole.

[0024] Preferably, the telescopic rod is provided with a positioning rack, and the brake is a second electromagnetic pin. The end of the second electromagnetic pin is provided with a first pin tooth that cooperates with the positioning rack, and the first pin tooth is brakely connected to the positioning rack.

[0025] Preferably, the right side of the motor shaft is connected to a brake disc, and a position locking device is installed on the brake disc and fixed to the motor housing.

[0026] Preferably, the brake disc is installed inside the motor housing.

[0027] Preferably, the brake disc is located outside the motor housing.

[0028] Preferably, the brake disc has at least two brake ball slots, the position locking device is a brake, the brake is an elastic ball seat, the elastic ball seat includes a brake seat, the brake seat has a spring-embedded hole, the spring-embedded hole has a pressure spring and a brake ball in contact with the pressure spring arranged sequentially from the inside to the outside, the brake ball slides on the brake disc to form a braking circumferential trajectory, the brake ball slot is on the braking circumferential trajectory, and the brake seat is fixed to the motor housing.

[0029] Preferably, the positions of the brake ball grooves on the brake disc overlap on one brake ball groove.

[0030] Preferably, the brake disc has at least two brake disc insertion holes, and a position locking device is installed at the corresponding position of the brake disc insertion hole. The position locking device is a brake, and the brake is a first electromagnetic pin. The first electromagnetic pin matches the brake disc insertion hole and can be inserted into the brake disc insertion hole.

[0031] Preferably, the positions of the brake disc insertion holes on the brake disc overlap with each other on one brake disc insertion hole.

[0032] Preferably, the brake disc has an annular positioning groove on its side, and the position locking device is a brake, which is a third electromagnetic pin. The end of the third electromagnetic pin has a second pin tooth that mates with the annular positioning groove of the brake disc, and the second pin tooth is brakely connected to the annular positioning groove of the brake disc.

[0033] Preferably, the position locking device is installed in the gearbox housing, and the position locking device is a brake, which is connected to the gearbox gears.

[0034] Preferably, the gearbox gear has at least two gear ball slots, the brake is an elastic ball seat, the elastic ball seat includes a brake seat, the brake seat has a spring-embedded hole, the spring-embedded hole has a pressure spring and a brake ball in contact with the pressure spring arranged sequentially from the inside to the outside, the brake ball slides on the gearbox gear to form a braking circumferential trajectory, the gear ball slot is on the braking circumferential trajectory, and the brake seat is fixed to the gearbox housing.

[0035] Preferably, the positions of the gear ball slots on the gearbox gears overlap on one gear ball slot.

[0036] Preferably, the gearbox gear has at least two gear insertion holes, and a brake is installed at the corresponding position of the gear insertion hole. The brake is a first electromagnetic pin, which matches the gear insertion hole and can be inserted into the gear insertion hole.

[0037] Preferably, the gear sockets on the gearbox gears are positioned to overlap on one gear socket.

[0038] Preferably, the gearbox gear has a gear annular positioning tooth groove on its side, and the brake is a third electromagnetic pin. The end of the third electromagnetic pin has a second pin tooth that cooperates with the gear annular positioning tooth groove, and the second pin tooth is brakely connected to the gear annular positioning tooth groove.

[0039] Preferably, the telescopic rod or gearbox of the lead screw telescoping device is rotatably connected to the tail end of the large fork of the dust removal reverse fan device.

[0040] Compared with the prior art, the present invention has the following significant advantages: The technical solution of the present invention has a simple structure. The retracted and extended states of the U-shaped electric push rod can be locked by the position locking device, avoiding the adverse effects of excessively short or long extension on the heat dissipation and dust removal effects of the dust removal reverse fan device. It achieves precise positioning of the blade angle of the dust removal reverse fan device. When the dust removal reverse fan device is working normally, the blades can be ensured to be at the optimal heat dissipation angle. When the dust removal reverse fan device is temporarily working in reverse, the blades can be ensured to be at the optimal dust removal angle. Moreover, the blade angle in both states is locked by the position locking device, which also avoids the blade angle deflection phenomenon under engine vibration. This effectively improves the dust removal and heat dissipation effects of the dust removal reverse fan device and improves the engine working efficiency.

[0041] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the U-shaped electric actuator installed on site, based on the background technology of this utility model.

[0043] Figure 2 for Figure 1 A schematic diagram of the U-shaped electric actuator structure.

[0044] Figure 3 for Figure 2 A schematic diagram of the gearbox structure.

[0045] Figure 4 This is a schematic diagram of the structure of Embodiment 1 of the present invention, which is a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0046] Figure 5 This is a schematic diagram of embodiment 2 of the present invention, which is a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0047] Figure 6 This is a schematic diagram of embodiment 3 of the present invention, which describes a U-shaped electric push rod for a cooling fan with telescopic positioning and locking function.

[0048] Figure 7 This is a schematic diagram of embodiment 4 of the present invention, which describes a U-shaped electric push rod for a cooling fan with telescopic positioning and locking function.

[0049] Figure 8 This is a schematic diagram of embodiment 5 of the present invention, which describes a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0050] Figure 9 This is a schematic diagram of embodiment 6 of the present invention, which describes a U-shaped electric push rod for a cooling fan with telescopic positioning and locking function.

[0051] Figure 10 for Figure 9 A schematic diagram of the structure of a medium-elastic ball seat.

[0052] Figure 11 This is a schematic diagram of embodiment 7 of the present invention, which describes a U-shaped electric push rod for a cooling fan with telescopic positioning and locking function.

[0053] Figure 12 This is a schematic diagram of embodiment 8 of the present invention, which describes a U-shaped electric push rod for a cooling fan with telescopic positioning and locking function.

[0054] Figure 13 for Figure 12 A schematic diagram of the structure of the second electromagnetic latch.

[0055] Figure 14 This is a schematic diagram of embodiment 9 of the present invention, which is a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0056] Figure 15 for Figure 14 Right view of the structure of the central brake disc.

[0057] Figure 16 This is a schematic diagram of the structure of Embodiment 10 of the present invention, which is a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0058] Figure 17 for Figure 16 Right view of the structure of the central brake disc.

[0059] Figure 18 This is a schematic diagram of the structure of Embodiment 11 of the present invention, which is a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0060] Figure 19 for Figure 18 A schematic diagram of the annular positioning tooth groove of the brake disc.

[0061] Figure 20 for Figure 18 Left view of the third electromagnetic latch structure.

[0062] Figure 21 for Figure 20 Front view of the third electromagnetic latch structure.

[0063] Figure 22 This is a schematic diagram of embodiment 12 of the present invention, which is a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0064] Figure 23 for Figure 22 Left view of the gear structure of the intermediate gearbox.

[0065] Figure 24 This is a schematic diagram of embodiment 13 of the present invention, which is a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0066] Figure 25 for Figure 24 Left view of the gear structure of the intermediate gearbox.

[0067] Figure 26 This is a schematic diagram of embodiment 14 of the present invention, which is a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan.

[0068] Figure 27 for Figure 26 Left view of the gear structure of the intermediate gearbox. Detailed Implementation

[0069] Example 1

[0070] like Figure 4 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. The rotating shaft of the motor 10 extends out of the motor housing, and an electromagnetic power-off brake 4 is installed on the rotating shaft of the motor 10 extending out of the motor housing. The electromagnetic power-off brake 4 is fixed to the outer side of the motor housing.

[0071] Working principle:

[0072] The extension process of the U-shaped electric push rod is as follows: the electromagnetic power-off brake 4 unlocks the shaft of the motor 1, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescoping device 3, when the lead screw telescoping device 3 is in the extended state and reaches the specified length, the motor 10 stops working, and the electromagnetic power-off brake 4 locks the shaft of the motor 10, thereby locking the extension length of the lead screw telescoping device 3.

[0073] The retraction process of the U-shaped electric push rod is as follows: the electromagnetic de-energizer 4 unlocks the shaft of the motor 10, the motor 10 drives the gearbox 21 to retract the lead screw telescopic device 3 to its original position, the motor 10 stops working, and the electromagnetic de-energizer 4 locks the shaft of the motor 10, thereby locking the retraction length of the lead screw telescopic device 3.

[0074] Example 2

[0075] like Figure 5 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. An electromagnetic power-off brake 4 is provided on the right side of the rotor of the motor 10. The electromagnetic power-off brake 4 is installed on the rotating shaft of the motor 10 and is fixed inside the motor housing.

[0076] Working principle:

[0077] The extension process of the U-shaped electric push rod is as follows: the electromagnetic power-off brake 4 unlocks the shaft of the motor 1, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescoping device 3, when the lead screw telescoping device 3 is in the extended state and reaches the specified length, the motor 10 stops working, and the electromagnetic power-off brake 4 locks the shaft of the motor 10, thereby locking the extension length of the lead screw telescoping device 3.

[0078] The retraction process of the U-shaped electric push rod is as follows: the electromagnetic de-energizer 4 unlocks the shaft of the motor 10, the motor 10 drives the gearbox 21 to retract the lead screw telescopic device 3 to its original position, the motor 10 stops working, and the electromagnetic de-energizer 4 locks the shaft of the motor 10, thereby locking the retraction length of the lead screw telescopic device 3.

[0079] Example 3

[0080] like Figure 6 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. The extension shaft of the first main shaft 22 of the gearbox 21 extends out of the left outer side of the gearbox 21. An electromagnetic power-off brake 4 is installed on the extension shaft of the first main shaft 22 of the gearbox 21 extending out of the left outer side of the gearbox 21. The electromagnetic power-off brake 4 is fixed to the outer side of the gearbox 21.

[0081] Working principle:

[0082] The extension process of the U-shaped electric push rod is as follows: the electromagnetic de-energizer 4 unlocks the extension shaft of the first main shaft 22, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, when the lead screw telescopic device 3 is in the extended state and reaches the specified length, the motor 10 stops working, and the electromagnetic de-energizer 4 locks the extension shaft of the first main shaft 22, thereby locking the extension length of the lead screw telescopic device 3.

[0083] The retraction process of the U-shaped electric push rod is as follows: the electromagnetic de-energizer 4 unlocks the extension shaft of the first main shaft 22, the motor 10 drives the gearbox 21 to retract the lead screw telescopic device 3 to its original position, the motor 10 stops working, and the electromagnetic de-energizer 4 locks the extension shaft of the first main shaft 22, thereby locking the retraction length of the lead screw telescopic device 3.

[0084] Example 4

[0085] like Figure 7As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. The third main shaft extension of the gearbox 21 extends out of the left outer side of the gearbox 21. An electromagnetic power-off brake 4 is installed on the third main shaft extension of the gearbox 21 extending out of the left outer side of the gearbox 21. The electromagnetic power-off brake 4 is fixed to the outer side of the gearbox 21.

[0086] Working principle:

[0087] The extension process of the U-shaped electric push rod is as follows: the electromagnetic de-energizer 4 unlocks the third main shaft extension shaft, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescoping device 3, when the lead screw telescoping device 3 is in the extended state and reaches the specified length, the motor 10 stops working, and the electromagnetic de-energizer 4 locks the third main shaft extension shaft, thereby locking the extension length of the lead screw telescoping device 3.

[0088] The retraction process of the U-shaped electric push rod is as follows: the electromagnetic de-energizer 4 unlocks the third main shaft extension shaft, the motor 10 drives the gearbox 21 to retract the lead screw telescopic device 3 to its original position, the motor 10 stops working, and the electromagnetic de-energizer 4 locks the third main shaft extension shaft, thereby locking the retraction length of the lead screw telescopic device 3.

[0089] Example 5

[0090] like Figure 8 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. The fourth main shaft extension of the gearbox 21 extends out of the left outer side of the gearbox 21. An electromagnetic power-off brake 4 is installed on the fourth main shaft extension of the gearbox 21 extending out of the left outer side of the gearbox 21. The electromagnetic power-off brake 4 is fixed to the outer side of the gearbox 21.

[0091] Working principle:

[0092] The extension process of the U-shaped electric push rod is as follows: the electromagnetic de-energizer 4 unlocks the fourth main shaft extension shaft, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, when the lead screw telescopic device 3 is in the extended state and reaches the specified length, the motor 10 stops working, and the electromagnetic de-energizer 4 locks the fourth main shaft extension shaft, thereby locking the extension length of the lead screw telescopic device 3.

[0093] The retraction process of the U-shaped electric push rod is as follows: the electromagnetic de-energizer 4 unlocks the fourth main shaft extension shaft, the motor 10 drives the gearbox 21 to retract the lead screw telescopic device 3 to its original position, the motor 10 stops working, and the electromagnetic de-energizer 4 locks the fourth main shaft extension shaft, thereby locking the retraction length of the lead screw telescopic device 3.

[0094] Example 6

[0095] like Figure 9 and Figure 10 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10 connected to a gearbox 21. The gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. An elastic ball seat 5a is installed on the telescopic rod 34 of the lead screw telescopic device 3. The elastic ball seat 5a is fixed to the lead screw telescopic device housing 31. The telescopic rod 34 is provided with two telescopic rod ball hole slots arranged left and right. The elastic ball seat 5a includes a brake seat 50. The brake seat 50 is provided with a spring built-in hole. The spring built-in hole is provided with a pressure spring 52 and a brake ball 51 in contact with the pressure spring from the inside to the outside. The brake ball 51 can slide into the telescopic rod ball hole slot during the extension of the telescopic rod 34.

[0096] Working principle:

[0097] The extension process of the U-shaped electric push rod is as follows: the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to move, the brake ball 51 is pushed out of the ball hole groove of the right telescopic rod by pressure, the telescopic rod 34 continues to extend, when the brake ball 51 slides into the ball hole groove of the left telescopic rod, at this time the lead screw telescopic device 3 reaches the specified length, the motor 10 stops working, and thus the extension length of the telescopic rod 34 is locked.

[0098] The retraction process of the U-shaped electric push rod is as follows: the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to move, the brake ball 51 is pushed out of the ball hole groove of the left telescopic rod by pressure, the telescopic rod 34 continues to retract, when the brake ball 51 slides into the ball hole groove of the right telescopic rod, at this time the lead screw telescopic device 3 reaches the specified retraction length, the motor 10 stops working, and thus the extension length of the telescopic rod 34 is locked.

[0099] Example 7

[0100] like Figure 11As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10 connected to a gearbox 21. The gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. A first electromagnetic pin 5b is installed on the telescopic rod 34 of the lead screw telescopic device 3. The first electromagnetic pin 5b is fixed to the lead screw telescopic device housing 31. The telescopic rod 34 is provided with two telescopic rod insertion holes arranged left and right. The first electromagnetic pin 5b matches the telescopic rod insertion holes and can be inserted into the telescopic rod insertion holes.

[0101] Working principle:

[0102] The extension process of the U-shaped electric push rod is as follows: the first electromagnetic pin 5b exits the right telescopic rod socket to unlock the telescopic rod 34, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, and the lead screw telescopic device 3 drives the telescopic rod 34 to extend. When the telescopic rod 34 reaches the specified length, the left telescopic rod socket aligns with the first electromagnetic pin 5b, the motor 10 stops working, and the first electromagnetic pin 5b extends into the left telescopic rod socket, thereby locking the extension length of the telescopic rod 34.

[0103] The retraction process of the U-shaped electric push rod is as follows: the first electromagnetic pin 5b exits the left telescopic rod socket to unlock the telescopic rod 34, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, and the lead screw telescopic device 3 drives the telescopic rod 34 to retract. When the telescopic rod 34 reaches the specified length, the right telescopic rod socket aligns with the first electromagnetic pin 5b, the motor 10 stops working, and the first electromagnetic pin 5b extends into the right telescopic rod socket, thereby locking the retraction length of the telescopic rod 34.

[0104] Example 8

[0105] like Figure 12 and Figure 13 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. A second electromagnetic pin 5cI is installed on the telescopic rod 34 of the lead screw telescopic device 3. The second electromagnetic pin 5cI is fixed to the lead screw telescopic device housing 31. A positioning rack 36 is provided on the telescopic rod 34. The end of the second electromagnetic pin 5cI is provided with a first pin tooth 53 that cooperates with the positioning rack 36. The first pin tooth 53 is brakely connected to the positioning rack 36.

[0106] Working principle:

[0107] The extension process of the U-shaped electric push rod is as follows: the second electromagnetic pin 5cI retracts, the first pin tooth 53 and the positioning rack 36 separate, the telescopic rod 34 is unlocked, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to extend. When the telescopic rod 34 reaches the specified length, the motor 10 stops working, the second electromagnetic pin 5cI extends, the first pin tooth 53 and the positioning rack 36 mesh, so that the extension length of the telescopic rod 34 is locked.

[0108] The retraction process of the U-shaped electric push rod is as follows: the second electromagnetic pin 5cI retracts, the first pin tooth 53 and the positioning rack 36 separate, the telescopic rod 34 is unlocked, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to retract. When the telescopic rod 34 reaches the specified length, the motor 10 stops working, the second electromagnetic pin 5cI extends, the first pin tooth 53 and the positioning rack 36 mesh, so that the retraction length of the telescopic rod 34 is locked.

[0109] Example 9

[0110] like Figure 14 , Figure 15 and Figure 10 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. The right side of the motor 10's rotating shaft is connected to a brake disc 6. The brake disc 6 is located outside the motor housing. An elastic ball seat 5a is installed on the brake disc 6 and is fixed to the motor housing. The brake disc 6 has two brake ball hole slots 61. The elastic ball seat 5a includes a brake seat 50. The brake seat 50 has a spring-embedded hole. From the inside to the outside, a pressure spring 52 and a brake ball 51 in contact with the pressure spring 52 are arranged in sequence in the spring-embedded hole. The brake ball 51 slides on the brake disc 6 to form a braking circumferential trajectory. The brake ball hole slot 61 is on the braking circumferential trajectory. The brake seat 50 is fixed to the motor housing.

[0111] Working principle:

[0112] The extension process of the U-shaped electric push rod is as follows: the motor 10 drives the brake disc 6 to rotate, and the brake ball 51 is pushed out of the original brake ball hole groove 61 by pressure, thereby realizing the continuous rotation of the brake disc 6. The motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, and the lead screw telescopic device 3 drives the telescopic rod 34 to perform an extension movement. After the brake disc 6 rotates several times, the lead screw telescopic device 3 reaches the specified length. At this time, the brake ball 51 is in another brake ball hole groove 61, the motor 10 stops working, and thus the extension length of the telescopic rod 34 is locked.

[0113] The retraction process of the U-shaped electric push rod is as follows: the motor 10 drives the brake disc 6 to rotate, and the brake ball 51 is pushed by pressure to slide out of another brake ball slot 61, thereby realizing the continuous rotation of the brake disc 6. The motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, and the lead screw telescopic device 3 drives the telescopic rod 34 to perform a retraction movement. After the brake disc 6 rotates several times, the lead screw telescopic device 3 reaches the specified length, and the brake ball 51 is now in the original brake ball slot 61. The motor 10 stops working, and thus the retraction length of the telescopic rod 34 is locked.

[0114] In this embodiment 9, two brake ball grooves 61 are used: one to lock the U-shaped electric push rod in its extended state, and the other to lock it in its retracted state. This arrangement solves the locking problem when the number of rotations of the brake disc 6 in both the extended and retracted states is not an integer number of rotations. When the number of rotations of the brake disc 6 is exactly an integer number of rotations, the two brake ball grooves 61 can be merged into one brake ball groove 61, obviously achieving the same technical effect.

[0115] Example 10

[0116] like Figure 16 and Figure 17 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. The right side of the motor 10's rotating shaft is connected to a brake disc 6. The brake disc 6 is disposed inside the motor housing and has two brake disc insertion holes 62. A first electromagnetic pin 5b is installed at the corresponding position of the brake disc insertion hole 62. The first electromagnetic pin 5b matches the brake disc insertion hole 62 and can be inserted into the brake disc insertion hole 62. The first electromagnetic pin 5b is fixed inside the motor housing.

[0117] Working principle:

[0118] The extension process of the U-shaped electric push rod is as follows: the first electromagnetic pin 5b exits the brake disc socket 62, the motor 10 drives the brake disc 6 to rotate, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to extend. After the brake disc 6 rotates several times, the lead screw telescopic device 3 reaches the specified length. At this time, the other brake disc socket 62 corresponds to the first electromagnetic pin 5b. The motor 10 stops working, the first electromagnetic pin 5b is inserted into the other brake disc socket 62, and thus the extension length of the telescopic rod 34 is locked.

[0119] The retraction process of the U-shaped electric push rod is as follows: the first electromagnetic pin 5b exits the other brake disc socket 62, the motor 10 drives the brake disc 6 to rotate, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to retract. After the brake disc 6 rotates several times, the lead screw telescopic device 3 reaches the specified length. At this time, the original brake disc socket 62 corresponds to the first electromagnetic pin 5b. The motor 10 stops working, the first electromagnetic pin 5b is inserted into the original brake disc socket 62, and thus the retraction length of the telescopic rod 34 is locked.

[0120] In this embodiment 10, two brake disc insertion holes 62 are used: one to lock the U-shaped electric push rod in its extended state, and the other to lock it in its retracted state. This arrangement solves the locking problem when the number of rotations of the brake disc 6 in both the extended and retracted states is not an integer number of rotations. When the number of rotations of the brake disc 6 is exactly an integer number of rotations, the two brake disc insertion holes 62 can be combined into one brake disc insertion hole 62, obviously achieving the same technical effect.

[0121] Example 11

[0122] like Figure 18 , Figure 19 , Figure 20 and Figure 21 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. The right side of the motor 10 shaft is connected to a brake disc 6. The brake disc 6 is located outside the motor housing. The side of the brake disc 6 is provided with a brake disc annular positioning groove 63. A third electromagnetic pin 5cII is installed on the brake disc annular positioning groove 63. The end of the third electromagnetic pin 5cII is provided with a second pin tooth 54 that cooperates with the brake disc annular positioning groove 63. The second pin tooth 54 is brakely connected to the brake disc annular positioning groove 63. The third electromagnetic pin 5cII is fixed to the outside of the motor housing.

[0123] Working principle:

[0124] The extension process of the U-shaped electric push rod is as follows: the third electromagnetic pin 5cII retracts, the second pin tooth 54 separates from the annular positioning groove 63 of the brake disc, the brake disc 6 is unlocked, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to extend. When the telescopic rod 34 reaches the specified length, the motor 10 stops working, the third electromagnetic pin 5cII extends, the second pin tooth 54 engages with the annular positioning groove 63 of the brake disc, the brake disc 6 is locked, and thus the extension length of the telescopic rod 34 is locked.

[0125] The retraction process of the U-shaped electric push rod is as follows: the third electromagnetic pin 5cII retracts, the second pin tooth 54 separates from the annular positioning groove 63 of the brake disc, the brake disc 6 is unlocked, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to retract. When the telescopic rod 34 reaches the specified length, the motor 10 stops working, the third electromagnetic pin 5cII extends, the second pin tooth 54 engages with the annular positioning groove 63 of the brake disc, the brake disc 6 is locked, and thus the retraction length of the telescopic rod 34 is locked.

[0126] Example 12

[0127] like Figure 22 , Figure 23 and Figure 10 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. An elastic ball seat 5a is installed on the gearbox 21. The elastic ball seat 5a includes a brake seat 50. The brake seat 50 has a spring-embedded hole. A pressure spring 52 and a brake ball 51 in contact with the pressure spring are arranged sequentially from the inside to the outside in the spring-embedded hole. The brake ball 51 slides on the third large gear 251 of the gearbox 21 to form a braking circumferential trajectory. The third large gear 251 has two gear ball hole grooves 2511, which are on the braking circumferential trajectory. The brake seat 50 is fixed to the gearbox housing.

[0128] Working principle:

[0129] The extension process of the U-shaped electric push rod is as follows: the motor 10 drives the third large gear 251 to rotate, and the brake ball 51 is pushed out of the original gear ball hole groove 2511 by pressure, thereby realizing the continuous rotation of the third large gear 251, which drives the lead screw telescopic device 3. The lead screw telescopic device 3 drives the telescopic rod 34 to perform an extension movement. After the third large gear 251 rotates several times, the lead screw telescopic device 3 reaches the specified length. At this time, the brake ball 51 is in another gear ball hole groove 2511, the motor 10 stops working, and the extension length of the telescopic rod 34 is locked.

[0130] The retraction process of the U-shaped electric push rod is as follows: the motor 10 drives the third large gear 251 to rotate, and the brake ball 51 is pushed out of the other gear ball slot 2511 by pressure, thereby realizing the continuous rotation of the third large gear 251, which drives the lead screw telescopic device 3. The lead screw telescopic device 3 drives the telescopic rod 34 to retract. After the third large gear 251 rotates several times, the lead screw telescopic device 3 reaches the specified length. At this time, the brake ball 51 is in the original gear ball slot 2511, the motor 10 stops working, and the retraction length of the telescopic rod 34 is locked.

[0131] In this embodiment 12, two gear ball slots 2511 are used: one to lock the U-shaped electric push rod in its extended state, and the other to lock it in its retracted state. This arrangement solves the locking problem when the number of rotations of the third large gear 251 in both the extended and retracted states is not an integer number of rotations. When the number of rotations of the third large gear 251 is exactly an integer number of rotations, the two gear ball slots 2511 can be combined into one gear ball slot 2511, obviously achieving the same technical effect.

[0132] Example 13

[0133] like Figure 24 and Figure 25 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. A first electromagnetic pin 5b is fixedly installed on the gearbox housing. The third large gear 251 of the gearbox 21 is provided with two gear insertion holes 2512. The gear insertion holes 2512 are positioned corresponding to the first electromagnetic pin 5b. The first electromagnetic pin 5b matches the gear insertion holes 2512, and the first electromagnetic pin 5b can be inserted into the gear insertion holes 2512.

[0134] Working principle:

[0135] The extension process of the U-shaped electric push rod is as follows: the first electromagnetic pin 5b exits the gear socket 2512, the motor 10 drives the gearbox 21, the third large gear 251 of the gearbox 21 rotates, thereby driving the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to perform an extension movement. After the third large gear 251 rotates several times, the lead screw telescopic device 3 reaches the specified length. At this time, the other gear socket 2512 corresponds to the first electromagnetic pin 5b. The motor 10 stops working, the first electromagnetic pin 5b is inserted into the other gear socket 2512, and thus the extension length of the telescopic rod 34 is locked.

[0136] The retraction process of the U-shaped electric push rod is as follows: the first electromagnetic pin 5b exits the other gear socket 2512, the motor 10 drives the gearbox 21, the third large gear 251 of the gearbox 21 rotates, thereby driving the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to retract. After the third large gear 251 rotates several times, the lead screw telescopic device 3 reaches the specified length, and the original gear socket 2512 now corresponds to the first electromagnetic pin 5b. The motor 10 stops working, the first electromagnetic pin 5b is inserted into the original gear socket 2512, and thus the retraction length of the telescopic rod 34 is locked.

[0137] In this embodiment 13, two gear sockets 2512 are used: one to lock the U-shaped electric push rod in its extended state, and the other to lock it in its retracted state. This arrangement solves the locking problem when the number of rotations of the third large gear 251 in both the extended and retracted states is not an integer number of rotations. When the number of rotations of the third large gear 251 is exactly an integer number of rotations, the two gear sockets 2512 can be combined into one gear socket 2512, obviously achieving the same technical effect.

[0138] Example 14

[0139] like Figure 26 , Figure 27 , Figure 20 and Figure 21 As shown, a U-shaped electric push rod with telescopic positioning and locking function for a cooling fan includes a U-shaped electric push rod, which includes a motor 10. The motor 10 is connected to a gearbox 21, and the gearbox 21 is connected to a lead screw telescopic device 3. The motor 10 and the lead screw telescopic device 3 are arranged on the same side of the gearbox 21 to form a U-shaped structure. A third electromagnetic pin 5cII is fixedly installed on the gearbox housing. The side of the third large gear 251 of the gearbox 21 is provided with a gear annular positioning groove 2513. The end of the third electromagnetic pin 5cII is provided with a second pin tooth 54 that cooperates with the gear annular positioning groove 2513. The second pin tooth 54 is brakely connected to the gear annular positioning groove 2513.

[0140] Working principle:

[0141] The extension process of the U-shaped electric push rod is as follows: the third electromagnetic pin 5cII retracts, the second pin tooth 54 separates from the gear ring positioning groove 2513, the third large gear 251 is unlocked, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to extend. When the telescopic rod 34 reaches the specified length, the motor 10 stops working, the third electromagnetic pin 5cII extends, the second pin tooth 54 meshes with the gear ring positioning groove 2513, the third large gear 251 is locked, and thus the extension length of the telescopic rod 34 is locked.

[0142] The retraction process of the U-shaped electric push rod is as follows: the third electromagnetic pin 5cII retracts, the second pin tooth 54 separates from the gear ring positioning groove 2513, the third large gear 251 is unlocked, the motor 10 drives the gearbox 21, the gearbox 21 drives the lead screw telescopic device 3, the lead screw telescopic device 3 drives the telescopic rod 34 to retract. When the telescopic rod 34 reaches the specified length, the motor 10 stops working, the third electromagnetic pin 5cII extends, the second pin tooth 54 meshes with the gear ring positioning groove 2513, the third large gear 251 is locked, and thus the retraction length of the telescopic rod 34 is locked.

[0143] Example 15

[0144] In practical use, including but not limited to the embodiments 1-14 above, the gearbox 21 is provided with a hinge hole, and the hinge hole can be rotatably connected to the tail end of the large shift fork 600 of the dust removal reverse fan device.

[0145] In addition to the embodiments described above, other undescribed implementation methods should also be within the protection scope of this utility model. The specific embodiments described herein are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims. Although this document uses specific terminology, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model, and interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan, characterized in that, It includes a U-shaped electric actuator, and the moving part of the U-shaped electric actuator is equipped with a position locking device.

2. The U-shaped electric push rod with telescopic positioning and locking function for a cooling fan according to claim 1, characterized in that, The position locking device is fixed to the non-moving part of the U-shaped electric push rod.

3. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 1, characterized in that, The U-shaped electric actuator includes a motor, which is connected to a gearbox. The gearbox is connected to a lead screw extension device, and the motor and the lead screw extension device are arranged on the same side of the gearbox to form a U-shaped structure.

4. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 3, characterized in that, A position locking device is installed on the motor shaft or its extension shaft.

5. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 4, characterized in that, The motor shaft extends out of the motor housing, and the position locking device is fixed to the outer side of the motor housing.

6. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 4, characterized in that, The position locking device is located on the right side of the motor rotor and is fixed inside the motor housing.

7. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 3, characterized in that, A position locking device is installed on the shaft of the gearbox gear or its extension shaft.

8. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 3, characterized in that, A position locking device is installed on the rotating shaft or its extension shaft of the lead screw telescoping device.

9. The U-shaped electric push rod with telescopic positioning and locking function for a cooling fan according to any one of claims 1, 2, 3, 4, 5, 6, 7, or 8, characterized in that, The position locking device is a braking device.

10. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 9, characterized in that, The braking device is an electromagnetic power-off brake.

11. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 3, characterized in that, The extension rod of the lead screw telescopic device is equipped with a position locking device.

12. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 11, characterized in that, The position locking device is fixed to the housing of the lead screw extension device or the motor housing.

13. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 11, characterized in that, The position locking device is a brake.

14. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 13, characterized in that, The telescopic rod is provided with at least two telescopic rod ball hole slots arranged in the left and right directions. The brake is an elastic ball seat, which includes a brake seat. The brake seat is provided with a spring-embedded hole. The spring-embedded hole is provided with a pressure spring and a brake ball in contact with the pressure spring in sequence from the inside to the outside. The brake ball can slide into the telescopic rod ball hole slot during the extension of the telescopic rod.

15. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 13, characterized in that, The telescopic rod is provided with at least two telescopic rod insertion holes arranged in the left and right directions. A brake is installed at the corresponding position of the telescopic rod insertion hole. The brake is a first electromagnetic pin, which matches the telescopic rod insertion hole and can be inserted into the telescopic rod insertion hole.

16. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 13, characterized in that, The telescopic rod is provided with a positioning rack, and the brake is a second electromagnetic pin. The end of the second electromagnetic pin is provided with a first pin tooth that cooperates with the positioning rack. The first pin tooth is brakely connected to the positioning rack.

17. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 3, characterized in that, The right side of the motor shaft is connected to the brake disc, and a position locking device is installed on the brake disc and fixed to the motor housing.

18. The U-shaped electric push rod with telescopic positioning and locking function for heat dissipation fan according to claim 17, characterized in that, The brake disc is installed inside the motor housing.

19. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 17, characterized in that, The brake disc is located outside the motor housing.

20. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 17, characterized in that, The brake disc has at least two brake ball slots. The position locking device is a brake, which is an elastic ball seat. The elastic ball seat includes a brake seat. The brake seat has a spring-embedded hole. The spring-embedded hole has a pressure spring and a brake ball in contact with the pressure spring arranged sequentially from the inside to the outside. The brake ball slides on the brake disc to form a braking circumferential trajectory. The brake ball slot is on the braking circumferential trajectory. The brake seat is fixed to the motor housing.

21. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 20, characterized in that, The positions of the brake ball grooves on the brake disc overlap with each other on one brake ball groove.

22. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 17, characterized in that, The brake disc has at least two brake disc insertion holes, and a position locking device is installed at the corresponding position of the brake disc insertion hole. The position locking device is a brake, and the brake is a first electromagnetic pin. The first electromagnetic pin matches the brake disc insertion hole and can be inserted into the brake disc insertion hole.

23. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 22, characterized in that, The positions of the brake disc insertion holes on the brake disc overlap with each other on one brake disc insertion hole.

24. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 17, characterized in that, The brake disc has an annular positioning tooth groove on its side. The position locking device is a brake, which is a third electromagnetic pin. The end of the third electromagnetic pin has a second pin tooth that mates with the annular positioning tooth groove of the brake disc. The second pin tooth is brakely connected to the annular positioning tooth groove of the brake disc.

25. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 3, characterized in that, The position locking device is installed in the gearbox housing, and the position locking device is a brake, which is connected to the gearbox gears.

26. The U-shaped electric push rod with telescopic positioning and locking function for a cooling fan according to claim 25, characterized in that, The gearbox gear has at least two gear ball slots. The brake is an elastic ball seat, which includes a brake seat. The brake seat has a spring-embedded hole. The spring-embedded hole has a pressure spring and a brake ball in contact with the pressure spring arranged sequentially from the inside to the outside. The brake ball slides on the gearbox gear to form a braking circumferential trajectory. The gear ball slot is on the braking circumferential trajectory. The brake seat is fixed to the gearbox housing.

27. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 26, characterized in that, The positions of the gear ball slots on the gearbox gears overlap with each other on one gear ball slot.

28. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 25, characterized in that, The gearbox gear has at least two gear insertion holes, and a brake is installed at the corresponding position of the gear insertion hole. The brake is a first electromagnetic pin, which matches the gear insertion hole and can be inserted into the gear insertion hole.

29. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 28, characterized in that, The positions of the gear sockets on the gearbox gears overlap with each other on one gear socket.

30. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 25, characterized in that, The gearbox gear has a gear annular positioning tooth groove on its side. The brake is a third electromagnetic pin. The end of the third electromagnetic pin has a second pin tooth that mates with the gear annular positioning tooth groove. The second pin tooth is brakely connected to the gear annular positioning tooth groove.

31. The U-shaped electric push rod with telescopic positioning and locking function for heat-dissipation fan according to claim 3, characterized in that, The telescopic rod or gearbox of the lead screw telescopic device can be rotatably connected to the tail end of the large fork of the dust removal reverse fan device.

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