A hand-held electric power tool for coal mines

Abstract

The present application relates to a kind of coal mine hand-held electric tools, the coal mine hand-held electric tool includes: shell, motor module, reducer module and fan, the shell is non-explosion-proof type shell, installation cavity is equipped in the shell, the motor module includes motor shell and motor body, the motor shell is metal explosion-proof structure piece and has explosion-proof cavity, the motor body is located in the explosion-proof cavity, the output shaft of the motor body extends to the outside of the motor shell, the reducer module and the motor module are located in the installation cavity along first direction, the output shaft is connected with reducer module transmission, the fan is located between the reducer module and the motor module, and the fan is fixedly connected with the output shaft, the air outlet end of the fan is arranged opposite to the motor module.The coal mine hand-held electric tool of the present application can be fully heat dissipated to motor module, is conducive to guarantee the reliability of motor work, and weight is lighter.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and more specifically, to a handheld power tool for coal mines. Background Technology

[0002] Explosion-proof handheld power tools are mainly used in flammable and explosive environments such as petrochemical plants and coal mines to assist workers in bolt assembly, equipment installation, and other operations, ensuring personnel safety. These tools are specifically designed for hazardous environments and feature safety protection systems. While improving the efficiency of underground maintenance and installation work, they also effectively prevent the generation of sparks or static electricity, thus avoiding the ignition of flammable gases or dust.

[0003] In related technologies, explosion-proof handheld power tools often adopt an integrated explosion-proof housing, that is, the motor and fan are installed in the same explosion-proof housing. However, the above-mentioned arrangement is not conducive to the heat dissipation of the motor and is relatively heavy. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a handheld power tool for coal mines, which can effectively dissipate heat from the motor module, thus ensuring the reliability of the motor operation, and is also lightweight.

[0006] An embodiment of the present invention provides a handheld power tool for coal mines, comprising: a housing, wherein the housing is a non-explosion-proof housing and has an internal mounting cavity; a motor module, wherein the motor module includes a motor housing and a motor body, the motor housing being a metal explosion-proof structural component with an explosion-proof cavity, the motor body being disposed within the explosion-proof cavity, and the output shaft of the motor body extending outside the motor housing; a reducer module, wherein the reducer module and the motor module are disposed in the mounting cavity along a first direction, and the output shaft is drively connected to the reducer module; and a fan, wherein the fan is disposed between the reducer module and the motor module, and the fan is fixedly connected to the output shaft, and the fan's outlet end is arranged opposite to the motor module.

[0007] According to an embodiment of the present invention, the handheld power tool for coal mines, because the motor housing is a metal explosion-proof structure with an explosion-proof cavity, and the outer shell is a non-explosion-proof shell, allows for a separate explosion-proof design of the motor module, reducing the overall weight of the handheld power tool while meeting the explosion-proof requirements. Furthermore, because the fan is located between the reducer module and the motor module, and the fan's outlet is opposite to the motor module, when the motor module drives the reducer module to rotate, it can simultaneously drive the fan to rotate, thus providing cooling for the motor module. Therefore, the handheld power tool for coal mines according to this embodiment of the present invention can effectively dissipate heat from the motor module, which is beneficial for ensuring the reliability of motor operation, and is also lightweight.

[0008] In some embodiments, the motor housing includes a housing body, a motor end cover, and a retaining ring. The retaining ring is disposed at the end of the housing body away from the fan. The motor end cover abuts between the housing body and the retaining ring. The motor end cover and the housing body define the explosion-proof cavity. A first explosion-proof surface is formed between the outer peripheral surface of the motor end cover and the inner peripheral surface of the housing body. A second explosion-proof surface is formed between the outer peripheral surface of the retaining ring and the inner peripheral surface of the housing body.

[0009] In some embodiments, the outer periphery of the motor end cover opposite to the retaining ring is provided with a concave stop, and the shell body is provided with a convex stop, the concave stop abutting against the convex stop, the first explosion-proof surface is an explosion-proof cylindrical surface, and the second explosion-proof surface is an explosion-proof threaded surface.

[0010] In some embodiments, the wall thickness of the motor housing is M, wherein 3mm≤M≤8mm; and / or, the material of the motor housing is at least one of gray cast iron, carbon structural steel and stainless steel.

[0011] In some embodiments, the fan includes a connecting sleeve and a plurality of blades. The connecting sleeve is coaxially fixed on the output shaft. The plurality of blades are arranged circumferentially on the connecting sleeve. Each blade has a first end face and a second end face arranged opposite to each other along its thickness direction. Both the first end face and the second end face are parallel to the axial direction of the output shaft.

[0012] In some embodiments, the fan includes a baffle plate disposed on the side of the connecting sleeve away from the motor module, and a windproof surface is provided at one end of the baffle plate adjacent to the motor module. At least one of the connecting sleeve and the blades is connected to the windproof surface.

[0013] In some embodiments, the housing is provided with an air inlet and an air outlet, the air inlet being arranged adjacent to the fan, and the air outlet being located on the side of the motor module opposite to the fan.

[0014] In some embodiments, the housing includes a side shell and an end shell, the end shell is disposed at one end of the side shell along the first direction, and the side shell and the end shell form the mounting cavity, the air outlet is disposed at the connection position of the side shell and the end shell, and the air inlet is disposed on the side shell.

[0015] In some embodiments, the mounting cavity includes an air convection zone disposed between the end face of the motor module facing away from the fan and the end housing.

[0016] In some embodiments, the handheld power tool for coal mining further includes a battery assembly, the housing further includes a grip, the upper end of the grip is connected to the side shell, the lower end of the grip is connected to the battery assembly, the motor module is located directly above the grip, the reducer module is located on one side of the grip along the first direction, and the air convection zone is located on the other side of the grip along the first direction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a handheld power tool for coal mines according to an embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of a handheld power tool for coal mines according to an embodiment of the present invention.

[0019] Figure 3 This is a partial schematic diagram of a handheld power tool for coal mines with part of its outer casing removed, according to an embodiment of the present invention.

[0020] Figure 4 This is an isometric view of a handheld power tool for coal mines after removing the outer casing and battery assembly, according to an embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional view of a handheld power tool for coal mines after removing the outer casing and battery assembly, according to an embodiment of the present invention.

[0022] Figure 6 This is a cross-sectional view of the motor module and fan of a handheld power tool for coal mines according to an embodiment of the present invention.

[0023] Figure label:

[0024] 1. Outer shell; 11. Mounting cavity; 111. Air convection zone; 12. Side shell; 121. Air inlet; 13. End shell; 131. Air outlet; 14. Handle;

[0025] 2. Reducer module;

[0026] 3. Motor module; 31. Motor housing; 311. Housing body; 3111. Raised stop; 312. Motor end cover; 3121. Recessed stop; 313. Retaining ring; 314. First explosion-proof surface; 315. Second explosion-proof surface; 32. Motor body; 321. Output shaft; 33. Explosion-proof cavity; 34. Heat sink fins;

[0027] 4. Fan; 41. Connecting sleeve; 42. Blade; 421. First end face; 422. Second end face; 43. Baffle;

[0028] 5. Battery assembly;

[0029] 6. Fixture module. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] The following is a reference appendix. Figures 1 to 6 A handheld power tool for coal mines is described according to an embodiment of the present invention.

[0032] like Figures 1 to 6 As shown, a handheld power tool for coal mines according to an embodiment of the present invention includes: a housing 1, a motor module 3, a reducer module 2, and a fan 4. The housing 1 is a non-explosion-proof housing, and a mounting cavity 11 is provided inside the housing 1. The motor module 3 includes a motor housing 31 and a motor body 32. The motor housing 31 is a metal explosion-proof structure and has an explosion-proof cavity 33. The motor body 32 is disposed in the explosion-proof cavity 33, and the output shaft 321 of the motor body 32 extends out of the motor housing 31. The reducer module 2 and the motor module 3 are disposed in the mounting cavity 11 along a first direction. The output shaft 321 is drive-connected to the reducer module 2. The fan 4 is disposed between the reducer module 2 and the motor module 3, and the fan 4 is fixedly connected to the output shaft 321. The air outlet of the fan 4 is arranged opposite to the motor module 3.

[0033] According to an embodiment of the present invention, the handheld power tool for coal mines, since the motor housing 31 is a metal explosion-proof structure with an explosion-proof cavity 33, and the outer shell 1 is a non-explosion-proof shell, allows for a separate explosion-proof design of the motor module 3. This reduces the overall weight of the handheld power tool for coal mines while still meeting the explosion-proof requirements. In other words, because the motor module 3 adopts an explosion-proof motor structure, there is no need for an explosion-proof design of the outer shell 1. For example, the outer shell 1 can be made of lightweight plastic or aluminum alloy, thereby reducing the overall weight of the handheld power tool for coal mines.

[0034] Furthermore, since the fan 4 is located between the reducer module 2 and the motor module 3, and the air outlet of the fan 4 is arranged opposite to the motor module 3, when the motor module 3 drives the reducer module 2 to rotate, it can simultaneously drive the fan 4 to rotate, thereby blowing air to cool the motor module 3. Therefore, the handheld power tool for coal mines in this embodiment of the invention can effectively dissipate heat from the motor module 3, which is beneficial to ensuring the reliability of motor operation, and it is also lightweight.

[0035] In related technologies, the fan 4 is usually located at the tail end of the motor module 3, that is, at the end of the motor module 3 away from the reducer module 2. In the above scheme, the air outlet 131 is provided at the end of the outer casing 1 adjacent to the fan 4. When the fan 4 rotates, the fan 4 can only dissipate heat from the tail end of the motor module 3, and the heat dissipation effect on the front end of the motor module 3 (that is, the end of the motor module 3 adjacent to the reducer) is poor. However, the handheld power tool for coal mines of the present invention, by placing the fan 4 between the reducer module 2 and the motor module 3, and with the air outlet of the fan 4 arranged opposite to the motor module 3, can extend the flow path of the cooling airflow and improve the cooling effect of the motor module 3.

[0036] On the other hand, since the heat generated by the reducer module 2 or the clamp module 6 during operation is not large, there is no need to dissipate it. Therefore, by arranging the air outlet of the fan 4 opposite to the motor module 3, the heat dissipation of the motor module 3 can be concentrated, thereby further improving the heat dissipation effect of the motor module 3.

[0037] Optionally, such as Figure 5 and Figure 6 As shown, the motor housing 31 includes a housing body 311, a motor end cover 312, and a retaining ring 313. The retaining ring 313 is located at the end of the housing body 311 facing away from the fan 4. The motor end cover 312 abuts against the housing body 311 and the retaining ring 313. The motor end cover 312 and the housing body 311 define an explosion-proof cavity 33. A first explosion-proof surface 314 is formed between the outer peripheral surface of the motor end cover 312 and the inner peripheral surface of the housing body 311, and a second explosion-proof surface 315 is formed between the outer peripheral surface of the retaining ring 313 and the inner peripheral surface of the housing body 311. It can be understood that both the retaining ring 313 and the motor end cover 312 have explosion-proof mating surfaces with the housing body 311, thereby improving the explosion-proof effect of the motor housing 31. In other words, the retaining ring 313 can both fix the motor end cover 312 to restrict the axial movement of the motor end cover 312 along the housing body 311 and form an explosion-proof mating surface with the housing body 311.

[0038] Specifically, such as Figure 5 and Figure 6As shown, the outer periphery of the motor end cover 312 opposite to the retaining ring 313 has a recessed stop 3121, and the housing body 311 has a convex stop 3111. The recessed stop 3121 abuts against the convex stop 3111. It can be understood that the mating surfaces of the recessed stop 3121 and the convex stop 3111 are generally stepped surfaces, which can increase the length of the explosion-proof mating surface and also provide axial positioning for the motor end cover 312.

[0039] For example, such as Figure 6 As shown, the first explosion-proof surface 314 is an explosion-proof cylindrical surface, and the second explosion-proof surface 315 is an explosion-proof threaded surface. It can be understood that the first explosion-proof surface 314 has a smooth outer circumference. The motor end cover 312 can be directly installed axially at one end of the housing body 311 and abuts against the protruding stop 3111 of the housing body 311. The retaining ring 313 is threadedly engaged with the housing body 311, thereby securing the motor end cover 312. It can be understood that, compared to a threaded connection scheme where the housing body 311 and motor end cover 312 are connected, this application eliminates the need for threaded holes on the housing body 311 and motor end cover 312, thus ensuring the explosion-proof effect of the motor housing 31. Furthermore, compared to a threaded connection scheme where the housing body 311 and motor end cover 312 are connected, this application can reduce the radial dimension of the motor housing 31, which is beneficial for the miniaturization design of handheld power tools used in coal mines.

[0040] Optionally, the wall thickness of the motor housing 31 is M, where 3mm ≤ M ≤ 8mm. For example, the material of the motor housing 31 is at least one of gray cast iron, carbon structural steel, and stainless steel. It is understood that since the motor housing 31 is an explosion-proof metal structural component, a larger wall thickness of the housing body 311 and the motor end cover 312 will result in a heavier motor module 3, making it difficult to hold the power tool. Conversely, a smaller wall thickness of the motor housing 31 will reduce its explosion-proof effect. Therefore, the inventors of this application have discovered through experimental research that when the wall thickness M is between 3mm and 8mm, both the explosion-proof effect of the motor housing 31 can be guaranteed, and the weight of the motor housing 31 can be reduced, achieving a lightweight design for handheld power tools used in coal mines.

[0041] Optionally, such as Figure 2 As shown, the outer casing 1 is provided with an air inlet 121 and an air outlet 131. The air inlet 121 is arranged adjacent to the fan 4, and the air outlet 131 is located on the side of the motor module 3 away from the fan 4. Since the fan 4 blows air towards the motor module 3, the air circulation rate between the air inlet 121 and the air outlet 131 can be increased when the fan 4 rotates. That is, the external airflow can quickly pass through the air inlet 121 into the mounting cavity 11, and then the airflow can move towards the motor module 3 and quickly flow out from the air outlet 131, thereby improving the heat dissipation effect of the motor module 3.

[0042] In some embodiments, the fan 4 includes a connecting sleeve 41 and a plurality of blades 42. The connecting sleeve 41 is coaxially fixed to the output shaft 321. The plurality of blades 42 are arranged at intervals along the circumference of the output shaft 321 on the connecting sleeve 41. Each blade 42 has a first end face 421 and a second end face 422 arranged opposite to each other along its thickness direction. Both the first end face 421 and the second end face 422 are parallel to the axial direction of the output shaft 321. It can be understood that since both the first end face 421 and the second end face 422 are parallel to the axial direction of the output shaft 321, when the motor module 3 rotates forward or reverse, the fan 4 can blow air towards the motor module 3, thereby improving the heat dissipation effect of the motor module 3.

[0043] Furthermore, the fan 4 includes a baffle 43, which is located on the side of the connecting sleeve 41 away from the motor module 3. The end of the baffle 43 adjacent to the motor module 3 has a wind-blocking surface, and at least one of the connecting sleeve 41 and the blades 42 is connected to the wind-blocking surface. It is understood that the baffle 43 can block the airflow flowing towards the reducer module 2, so that the majority of the airflow flows towards the motor module 3.

[0044] For example, the outer periphery of the baffle 43 may be equal in size to the outer periphery formed by the plurality of blades 42, or the outer periphery of the baffle 43 may be slightly larger than the outer periphery formed by the plurality of blades 42.

[0045] In some embodiments, the outer casing 1 includes a side casing 12 and an end casing 13. The end casing 13 is disposed at one end of the side casing 12 along a first direction, and the side casing 12 and the end casing 13 form a mounting cavity 11. An air outlet 131 is disposed at the connection position between the side casing 12 and the end casing 13, and an air inlet 121 is disposed on the side casing 12. It is understood that when an operator uses a power tool equipped with this handheld power tool for coal mining, the operator's face will be facing the end casing 13. Therefore, in the handheld power tool for coal mining of the embodiments of the present invention, the air outlet 131 is disposed at the connection position between the side casing 12 and the end casing 13, which can prevent the airflow from blowing directly on the operator's face, and at the same time does not shorten the flow path of the cooling airflow in the mounting cavity 11, resulting in better performance.

[0046] Specifically, there are multiple air outlets 131, which are arranged at intervals along the circumference of the end shell 13. There are also multiple air inlets 121, which are arranged at intervals along the circumference of the side shell 12. This can improve the uniformity of heat dissipation of the motor module 3.

[0047] In one example, the handheld power tool for coal mining also includes a breathable dust cover (not shown), which is disposed inside the mounting cavity 11 and covers the air inlet 121 and the air outlet 131. This prevents external dust from entering the mounting cavity 11, thereby improving the reliability of the power tool's operation.

[0048] In some embodiments, the mounting cavity 11 includes an air convection zone 111, which is located between the end face of the motor module 3 facing away from the fan 4 and the end housing 13. It is understood that the end face of the motor module 3 facing away from the fan 4 is spaced apart from the end housing 13 along a first direction. Air cooling the motor module 3 can be buffered by the air convection zone 111 before being discharged from the air outlet 131, thereby ensuring the smooth discharge of hot air after cooling the motor.

[0049] Optionally, such as Figures 1 to 3 As shown, the handheld power tool for coal mines also includes a battery assembly 5, and the outer casing 1 also includes a grip 14. The upper end of the grip 14 is connected to the side casing 12, and the lower end of the grip 14 is connected to the battery assembly 5. The motor module 3 is located directly above the grip 14, the reducer module 2 is located on one side of the grip 14 along the first direction, and the air convection zone 111 is located on the other side of the grip 14 along the first direction.

[0050] It is understandable that, such as Figures 1 to 3 As shown, by providing an air convection zone 111 in the mounting cavity 11, and with the air convection zone 111 located on the other side of the grip portion 14 along the first direction, the center of gravity of the handheld power tool for coal mining can be approximately located at the position of the grip portion 14, making it convenient for the user to hold. Furthermore, when the handheld power tool for coal mining is placed vertically (with the lower end face of the battery assembly 5 in contact with the placement surface), the stability of the handheld power tool for coal mining can be improved, avoiding the problem of the handheld power tool for coal mining tipping over during placement.

[0051] For example, such as Figure 2 As shown, the dimension of the air convection zone 111 along the first direction is A, where 2cm ≤ A ≤ 5cm. For example, the dimension A of the air convection zone 111 along the first direction can be 2cm, 3cm, 4cm, or 5cm. The inventors of this application discovered through experimental research that when the dimension of the air convection zone 111 along the first direction is less than 2cm, the distance between the tail of the motor module 3 and the end shell 13 is relatively short, which is not conducive to heat dissipation of the tail of the motor module 3. When the dimension of the air convection zone 111 along the first direction is greater than 5cm, it will greatly reduce the airflow efficiency within the mounting cavity 11 and increase the weight of the outer shell 1, which is not conducive to the lightweight design of power tools.

[0052] In addition, by setting the air convection zone 111 to the above parameters, it is beneficial to ensure that the center of gravity of the handheld power tool for coal mines is generally located at the grip 14, which makes it easier for users to use.

[0053] Furthermore, such as Figure 3As shown, the outer periphery of the motor module 3 is provided with multiple heat dissipation fins 34, which extend along the first direction and are arranged at intervals along the circumference of the motor module 3, thereby further improving the heat dissipation effect of the motor module 3.

[0054] In the example of this application, the handheld power tool for coal mining can be one of an electric drill, an impact drill, or a hand saw. A clamping module 6 is provided at the end of the reducer module 2 facing away from the motor module 3. The clamping module 6 is used to clamp tools such as screwdriver bits, drill bits, and saw blades. The reducer module 2 and the clamping module 6 can be a single integrated structure and are snapped into the housing 1.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A handheld power tool for coal mines, characterized in that, include: The housing is a non-explosion-proof housing, and the housing has an internal mounting cavity; The motor module includes a motor housing and a motor body. The motor housing is a metal explosion-proof structure and has an explosion-proof cavity. The motor body is disposed in the explosion-proof cavity, and the output shaft of the motor body extends out of the motor housing. A speed reducer module and a motor module are disposed in the mounting cavity along a first direction, and the output shaft is connected to the speed reducer module in a transmission manner. A fan is disposed between the reducer module and the motor module, and the fan is fixedly connected to the output shaft. The air outlet of the fan is arranged opposite to the motor module. The motor housing includes a housing body, a motor end cover, and a retaining ring. The retaining ring is located at the end of the housing body away from the fan. The motor end cover abuts between the housing body and the retaining ring. The motor end cover and the housing body define the explosion-proof cavity. A first explosion-proof surface is formed between the outer peripheral surface of the motor end cover and the inner peripheral surface of the housing body. A second explosion-proof surface is formed between the outer peripheral surface of the retaining ring and the inner peripheral surface of the housing body.

2. The handheld power tool for coal mines according to claim 1, characterized in that, The outer periphery of the motor end cover opposite to the retaining ring is provided with a concave stop, and the shell body is provided with a convex stop. The concave stop and the convex stop abut against each other. The first explosion-proof surface is an explosion-proof cylindrical surface, and the second explosion-proof surface is an explosion-proof threaded surface.

3. The handheld power tool for coal mines according to claim 2, characterized in that, The wall thickness of the motor housing is M, where 3mm≤M≤8mm; And / or, the motor housing is made of at least one of gray cast iron, carbon structural steel and stainless steel.

4. The handheld power tool for coal mines according to claim 1, characterized in that, The fan includes a connecting sleeve and multiple blades. The connecting sleeve is coaxially fixed on the output shaft. The multiple blades are arranged circumferentially on the connecting sleeve. Each blade has a first end face and a second end face arranged opposite to each other along its thickness direction. Both the first end face and the second end face are parallel to the axial direction of the output shaft.

5. The handheld power tool for coal mines according to claim 4, characterized in that, The fan includes a baffle plate located on the side of the connecting sleeve away from the motor module. The end of the baffle plate adjacent to the motor module has a windproof surface, and at least one of the connecting sleeve and the blades is connected to the windproof surface.

6. The handheld power tool for coal mines according to claim 1, characterized in that, The housing is provided with an air inlet and an air outlet. The air inlet is arranged adjacent to the fan, and the air outlet is located on the side of the motor module away from the fan.

7. The handheld power tool for coal mines according to claim 6, characterized in that, The outer casing includes a side shell and an end shell. The end shell is disposed at one end of the side shell along the first direction, and the side shell and the end shell form the mounting cavity. The air outlet is disposed at the connection position between the side shell and the end shell, and the air inlet is disposed on the side shell.

8. The handheld power tool for coal mines according to claim 7, characterized in that, The mounting cavity includes an air convection zone, which is located between the end face of the motor module facing away from the fan and the end shell.

9. The handheld power tool for coal mines according to claim 8, characterized in that, The handheld power tool for coal mining also includes a battery assembly, and the outer shell also includes a grip. The upper end of the grip is connected to the side shell, and the lower end of the grip is connected to the battery assembly. The motor module is located directly above the grip, the reducer module is located on one side of the grip along the first direction, and the air convection zone is located on the other side of the grip along the first direction.

Images