Battery charging structure for coal mine and handheld electric tool

Abstract

The utility model relates to a coal mine battery charging structure and a hand-held electric tool, the coal mine battery charging structure comprises a battery box, a battery, a plugging member, a charging head and a blocking diode, the battery box is internally provided with an explosion-proof cavity, the battery box is provided with a mounting hole, the battery is arranged in the explosion-proof cavity, and the charging head is arranged in the mounting hole. The blocking piece and the charging head are both arranged in the mounting hole, the outer wall of at least one of the blocking piece and the charging head and the inner wall of the mounting hole are provided with a first explosion-proof joint face, and the positive electrode of the charging head is electrically connected with the positive electrode of the blocking diode; the negative electrode of the blocking diode is electrically connected with the positive electrode of the battery, and the negative electrode of the battery is electrically connected with the negative electrode of the charging head. The battery charging structure for the coal mine can adapt to inflammable and explosive construction environments, is not easy to cause safety accidents, and is better in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a battery charging structure for coal mines and a handheld electric tool. Background Art

[0002] Explosion-proof handheld power tools are mainly used in flammable and explosive environments such as petrochemicals and coal mines to assist workers in bolt assembly, equipment installation and other operations to ensure the safety of personnel. Explosion-proof handheld power tools are tools with safety protection systems specially designed for hazardous environments. While improving the efficiency of workers' underground maintenance and installation operations, they can also effectively prevent the generation of sparks or static electricity, thereby avoiding the detonation of flammable gases or dust.

[0003] In the related art, explosion-proof handheld power tools used in coal mines are usually equipped with rechargeable batteries. Due to the risk of explosion caused by gas and coal dust in the mine, the battery charging head is exposed to the environment and is prone to safety accidents. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the utility model proposes a battery charging structure for coal mines, which can adapt to inflammable and explosive construction environments, is not likely to cause safety accidents, and has good reliability.

[0006] The embodiment of the utility model further provides a handheld electric tool.

[0007] The battery charging structure for coal mines of the embodiment of the utility model comprises: a battery box, a flameproof cavity is provided in the battery box, and a mounting hole is provided on the battery box; a battery, the battery is arranged in the flameproof cavity; a blocking member and a charging head, the blocking member and the charging head are both arranged in the mounting hole, the charging head is closer to the flameproof cavity than the blocking member, the blocking member is detachably connected to the mounting hole, and the outer wall of at least one of the blocking member and the charging head and the inner wall of the mounting hole have a first flameproof joint surface; a blocking diode, the positive electrode of the charging head is electrically connected to the positive electrode of the blocking diode, the negative electrode of the blocking diode is electrically connected to the positive electrode of the battery, and the negative electrode of the battery is electrically connected to the negative electrode of the charging head.

[0008] According to the battery charging structure for coal mines of the embodiment of the utility model, since the battery is arranged in the explosion-proof cavity, and the outer wall of at least one of the sealing member and the charging head and the inner wall of the mounting hole have a first explosion-proof joint surface, the battery and the charging head can be explosion-proofed, so that the battery charging structure for coal mines can adapt to the inflammable and explosive construction environment, is not easy to cause safety accidents, and has good reliability. In addition, since a blocking diode is arranged on the charging circuit between the charging head and the battery, so that the charging circuit can only be forward-conducted, that is, the charging circuit between the charging head and the battery constitutes an intrinsically safe circuit, so that the battery charging structure for coal mines can work in an inflammable and explosive construction environment. Therefore, the battery charging structure for coal mines of the embodiment of the utility model takes into account both explosion-proof and intrinsic safety, can adapt to the inflammable and explosive construction environment, is not easy to cause safety accidents, and has good reliability.

[0009] In some embodiments, there are two blocking diodes, and the two blocking diodes are connected in series between the positive electrode of the charging head and the positive electrode of the battery.

[0010] In some embodiments, the blocking member is a screw plug, which is threadably matched with the inner wall of the mounting hole and has the first flameproof joint surface.

[0011] In some embodiments, the sealing member is a rubber plug, and the outer wall of the charging head and the inner wall of the mounting hole have the first explosion-proof joint surface.

[0012] In some embodiments, the battery box includes a box body and a cover body, both of which are metal explosion-proof structural parts. The box body and the cover body are detachably connected and define the explosion-proof cavity, and the matching position of the box body and the cover body has a second explosion-proof joint surface.

[0013] In some embodiments, the battery charging structure for coal mines also includes a threading piece and a wire. The threading piece is provided on the box body, one end of the wire is connected to the battery, and the other end of the wire passes through the threading piece and is led out of the battery box. A casting material for fixing the wire is provided inside the threading piece.

[0014] In some embodiments, the cover body and the box body are threadedly matched, and the second explosion-proof joint surface is a explosion-proof threaded joint surface, the length of the explosion-proof threaded joint surface along the thickness direction of the cover body is A, where A≥8mm; and / or the dimension of the casting material along the length direction of the wire is B, where B≥20mm.

[0015] In some embodiments, the wall thickness of the box body and the wall thickness of the cover body are C, wherein 3mm≤C≤8mm; and / or, the box body and the cover body are made of at least one of gray cast iron, carbon structural steel and stainless steel.

[0016] In some embodiments, an ear seat is provided on a side of the box body facing away from the explosion-proof cavity, and at least two connecting holes are provided on the ear seat.

[0017] The handheld electric tool of the embodiment of the utility model comprises the battery charging structure for coal mines of the embodiment of the utility model.

[0018] In the handheld power tool of the embodiment of the utility model, since the battery is arranged in the explosion-proof cavity, and the outer wall of at least one of the sealing member and the charging head and the inner wall of the mounting hole have a first explosion-proof joint surface, the battery and the charging head can be explosion-proofed, so that the battery charging structure for coal mines can adapt to the inflammable and explosive construction environment, is not easy to cause safety accidents, and has good reliability. In addition, since a blocking diode is arranged on the charging circuit between the charging head and the battery, so that the charging circuit can only be forward-conducted, that is, the charging circuit between the charging head and the battery constitutes an intrinsically safe circuit, so that the handheld power tool can work in an inflammable and explosive construction environment. Therefore, the handheld power tool of the embodiment of the utility model takes into account both explosion-proof and intrinsic safety, can adapt to the inflammable and explosive construction environment, is not easy to cause safety accidents, and has good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axonometric view of a battery charging structure for coal mines according to an embodiment of the utility model.

[0020] Figure 2 It is a top view of the battery charging structure for coal mines according to an embodiment of the utility model.

[0021] Figure 3 yes Figure 2 Cross-sectional view of AA.

[0022] Figure 4 yes Figure 2 Cross-section of BB.

[0023] Figure 5 It is a circuit diagram of a battery charging structure for coal mines according to an embodiment of the utility model.

[0024] Figure 6 Schematic diagram of a handheld electric tool according to an embodiment of the utility model.

[0025] Figure 7 It is a cross-sectional view of a handheld electric tool according to an embodiment of the utility model.

[0026] Reference numerals:

[0027] 1. battery box; 11. box body; 111. mounting hole; 112. ear seat; 1121. connection hole; 12. cover body; 13. flameproof cavity; 14. second flameproof joint surface;

[0028] 21. blocking member; 22. charging head; 23. first flameproof joint surface;

[0029] 3. Blocking diode;

[0030] 4. Threading parts; 41. Casting material;

[0031] 5. Battery;

[0032] 6. Control panel;

[0033] 7. Shell;

[0034] 8. Flameproof motor;

[0035] 9. Clamp. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0037] Please refer to the following Figures 1 to 7 The utility model is described in an embodiment of a battery charging structure for coal mines and a handheld electric tool.

[0038] like Figures 1 to 7 As shown, a battery charging structure for coal mines according to an embodiment of the utility model comprises: a battery box 1, a battery 5, a blocking member 21, a charging head 22 and a blocking diode 3. A flameproof cavity 13 is provided in the battery box 1, a mounting hole 111 is provided on the battery box 1, the battery 5 is arranged in the flameproof cavity 13, the blocking member 21 and the charging head 22 are both arranged in the mounting hole 111, the charging head 22 is closer to the flameproof cavity 13 than the blocking member 21, the blocking member 21 is detachably connected to the mounting hole 111, the outer wall of at least one of the blocking member 21 and the charging head 22 and the inner wall of the mounting hole 111 have a first flameproof joint surface 23, the positive electrode of the charging head 22 is electrically connected to the positive electrode of the blocking diode 3, the negative electrode of the blocking diode 3 is electrically connected to the positive electrode of the battery 5, and the negative electrode of the battery 5 is electrically connected to the negative electrode of the charging head 22.

[0039] In the battery charging structure for coal mines of the embodiment of the utility model, since the battery 5 is arranged in the explosion-proof cavity 13, and the outer wall of at least one of the blocking member 21 and the charging head 22 and the inner wall of the mounting hole 111 have a first explosion-proof joint surface 23, the battery 5 and the charging head 22 can be explosion-proofed, so that the battery charging structure for coal mines can adapt to the inflammable and explosive construction environment, is not easy to cause safety accidents, and has good reliability. In addition, since a blocking diode 3 is provided on the charging circuit between the charging head 22 and the battery 5, so that the charging circuit can only be forward-conducted, that is, the charging circuit between the charging head 22 and the battery 5 constitutes an intrinsically safe circuit, so that the battery charging structure for coal mines can work in an inflammable and explosive construction environment. Therefore, the battery charging structure for coal mines of the embodiment of the utility model takes into account both explosion-proof and intrinsic safety, can adapt to the inflammable and explosive construction environment, is not easy to cause safety accidents, and has good reliability.

[0040] It should be noted that if Figure 5 As shown, the blocking diode 3 can only enable the current to flow in the direction from the positive electrode of the charging head 22 to the positive electrode of the battery 5. When the current flows in the direction from the positive electrode of the battery 5 to the positive electrode of the charging head 22, the reverse breakdown voltage of the blocking diode 3 will increase, thereby protecting the charging circuit.

[0041] Alternatively, if Figure 5 As shown, there are two blocking diodes 3, and the two blocking diodes 3 are connected in series between the positive electrode of the charging head 22 and the positive electrode of the battery 5. It can be understood that the two blocking diodes 3 have the same conductive direction. As the number of blocking diodes 3 increases, the forward voltage loss of the charging circuit will also increase. Therefore, by setting two blocking diodes 3, it is possible to ensure that the reverse breakdown voltage of the charging circuit is high and reduce the forward voltage loss of the charging circuit, and the use effect is better.

[0042] like Figure 3 As shown, Figure 1 and Figure 4 As shown, since the blocking member 21 is detachably connected, when the operator needs to charge the battery charging structure for coal mines, the blocking member 21 can be removed from the mounting hole 111 so as to insert the charging plug into the charging head 22 for charging. After charging is completed, the blocking member 21 can be installed in the charging head 22, thereby preventing impurities such as dust from entering the charging head 22 and achieving a certain explosion-proof effect.

[0043] For example, the sealing member 21 is a screw plug, which is threadably matched with the inner wall of the mounting hole 111 and has a first explosion-proof joint surface 23, thereby preventing dust and other impurities from entering the charging head 22 and achieving a certain explosion-proof effect.

[0044] For another example, the blocking member 21 is a rubber plug (not shown), and the outer wall of the charging head 22 and the inner wall of the mounting hole 111 have a first flameproof joint surface 23. It is understandable that since the charging head 22 and the inner wall of the mounting hole 111 have a flameproof joint surface, the position of the blocking member 21 does not need to be flameproofed, so the blocking member 21 can be sealed with a rubber plug, so that the operator can install and remove the blocking member 21 by hand, which is more practical.

[0045] In some embodiments, Figure 3 As shown, the battery box 1 includes a box body 11 and a cover body 12, both of which are metal explosion-proof structural parts, and the box body 11 and the cover body 12 are detachably connected and define an explosion-proof cavity 13, and the matching position of the box body 11 and the cover body 12 has a second explosion-proof joint surface 14. Furthermore, a control board 6 is also provided in the battery box 1, and the control board 6 is electrically connected to the battery 5.

[0046] According to the battery charging structure for coal mines of the embodiment of the utility model, since the box body 11 and the cover body 12 are both metal explosion-proof structural parts, and the box body 11 and the cover body 12 define an explosion-proof cavity 13, the battery 5 and the control board 6 share one explosion-proof cavity 13, so the battery charging structure for coal mines of the embodiment of the utility model does not need to set different explosion-proof cavities 13 for the battery 5 and the control board 6, which can make the structure of the battery charging structure for coal mines compact, which is conducive to reducing the occupied space of the battery charging structure for coal mines, and can make the battery 5 and the control board 6 meet the explosion-proof requirements. Therefore, the design of the battery charging structure for coal mines of the embodiment of the utility model is compact, which is conducive to reducing the occupied space and weight of the battery charging structure for coal mines, and the explosion-proof effect is good.

[0047] It is understandable that the mass of the explosion-proof structural parts is relatively large. In the related art, the heat dissipation device, the motor and the battery charging structure for coal mines are integrated in a large explosion-proof space. Since some parts do not need to be explosion-proof, the overall weight and size of the power tool are relatively large, which is not convenient for operators to hold. The battery charging structure for coal mines in the embodiment of the utility model specifically integrates the battery 5 and the control board 6 in a explosion-proof chamber 13, which can not only meet the explosion-proof requirements of the battery 5 and the control board 6, but also help to reduce the total weight of the power tool.

[0048] In some embodiments, Figure 4 As shown, the battery charging structure for coal mines also includes a threading member 4 and a wire (not shown). The threading member 4 is provided on the box body 11. One end of the wire is connected to the battery 5 and the control board 6. The other end of the wire passes through the threading member 4 and is led out of the battery box 1. A casting material 41 for fixing the wire is provided in the threading member 4. It can be understood that the wire is passed through the battery box 1 by casting, thereby improving the sealing of the explosion-proof cavity 13 and the explosion-proof effect of the battery box 1.

[0049] For example, the dimension of the potting material 41 along the length direction of the wire is B, where B≥20 mm, thereby further improving the explosion-proof reliability of the battery box 1 .

[0050] Alternatively, if Figure 3 As shown, the cover body 12 and the box body 11 are threadedly matched, and the second explosion-proof joint surface 14 is an explosion-proof threaded joint surface, and the length of the explosion-proof threaded joint surface along the thickness direction of the cover body 12 is A, wherein A ≥ 8 mm. It can be understood that the cover body 12 and the box body 11 of the battery box 1 of the utility model do not require external fasteners for fixation, and the cover body 12 and the box body 11 can complete the fixation of the cover body 12 and the box body 11 through their own threaded matching surfaces, thereby reducing the number of parts of the battery charging structure for coal mines and facilitating assembly. In addition, by limiting the length of the explosion-proof threaded joint surface along the thickness direction of the cover body 12 to be greater than or equal to 8 mm, the explosion-proof specification requirements of the battery box 1 can be met, and the reliability of the explosion-proof of the battery box 1 can be ensured.

[0051] In the example of this application, Figure 3 As shown, there are two cover bodies 12, both of which are arranged at the lower end of the box body 11, one of the cover bodies 12 corresponds to the battery 5, and the other cover body 12 corresponds to the control board 6. It can be understood that the two cover bodies 12 are arranged at intervals at the lower end of the box body 11 and are both threadedly matched with the box body 11, thereby making it convenient for operators to repair and replace the battery 5 and the control board 6 of the battery charging structure for coal mines.

[0052] Optionally, the wall thickness of the box body 11 and the wall thickness of the cover body 12 are C, where 3mm≤C≤8mm. For example, the material of the box body 11 and the cover body 12 is at least one of gray cast iron, carbon structural steel and stainless steel. It is understandable that since the box body 11 and the cover body 12 are explosion-proof metal structural parts, when the wall thickness of the box body 11 and the cover body 12 is large, the weight of the battery box 1 will be large, which is not conducive to the holding of the power tool. When the wall thickness of the box body 11 and the cover body 12 is small, the explosion-proof effect of the battery box 1 will be reduced. Therefore, the inventor of the present application found through experimental research that when the wall thickness C is between 3mm-8mm, it can not only ensure the explosion-proof effect of the battery box 1, but also reduce the weight of the battery charging structure for coal mines, thereby realizing the lightweight design of handheld power tools.

[0053] Alternatively, if Figure 1 and Figure 4As shown, an ear seat 112 is provided on the side of the box body 11 away from the flameproof chamber 13, and at least two connection holes 1121 are provided on the ear seat 112. For example, there are two ear seats 112, and the two ear seats 112 are arranged on the box body 11 at intervals, and two connection holes 1121 are arranged on the upper and lower sides of the two ear seats 112. It can be understood that the housing 7 of the power tool can be connected to the ear seat 112 to integrate the battery charging structure for coal mines on the power tool, thereby avoiding drilling directly on the wall surface of the battery box 1, and improving the firmness of the installation of the housing 7 and the battery charging structure for coal mines.

[0054] like Figure 6 and Figure 7 As shown, a handheld power tool of another embodiment of the utility model includes a battery charging structure for coal mines of any one of the utility models. The technical advantages of the handheld power tool of the embodiment of the utility model are the same as the technical advantages of the battery charging structure for coal mines of the above-mentioned embodiment, which will not be repeated here.

[0055] Furthermore, the handheld power tool also includes a housing 7, a flameproof motor 8 and a clamp 9. The housing 7 is a non-flameproof housing. The box body 11 is detachably connected to the housing 7. The flameproof motor 8 is disposed in the housing 7 and is transmission-connected to the clamp 9.

[0056] It is understandable that the handheld power tool adopts a flameproof motor 8, so there is no need to set a separate flameproof shell on the outside of the motor, and because the outer shell 7 is a non-flameproof shell, the outer shell 7 can be made of lightweight materials such as plastic to make the handheld power tool lighter.

[0057] For example, the clamping part of the clamp 9 can clamp tools such as drill bits and saw blades. That is, the handheld power tool can be a hand drill, an impact drill, a handheld electric saw, and other power tools. The present application does not specifically limit the specific type of the power tool.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A battery charging structure for coal mines, characterized in that: include: A battery box, wherein a flameproof cavity is provided in the battery box and a mounting hole is provided on the battery box; A battery, wherein the battery is arranged in the explosion-proof cavity; A blocking member and a charging head, wherein the blocking member and the charging head are both arranged in the mounting hole, the charging head is closer to the flameproof cavity than the blocking member, the blocking member is detachably connected to the mounting hole, and an outer wall of at least one of the blocking member and the charging head and an inner wall of the mounting hole have a first flameproof joint surface; A blocking diode, wherein the positive electrode of the charging head is electrically connected to the positive electrode of the blocking diode, the negative electrode of the blocking diode is electrically connected to the positive electrode of the battery, and the negative electrode of the battery is electrically connected to the negative electrode of the charging head.

2. The battery charging structure for coal mines according to claim 1, characterized in that: There are two blocking diodes, and the two blocking diodes are connected in series between the positive electrode of the charging head and the positive electrode of the battery.

3. The battery charging structure for coal mine according to claim 1, characterized in that: The blocking member is a screw plug, which is threadably matched with the inner wall of the mounting hole and has the first flameproof joint surface.

4. The battery charging structure for coal mines according to claim 1, characterized in that: The sealing member is a rubber plug, and the outer wall of the charging head and the inner wall of the mounting hole have the first explosion-proof joint surface.

5. The battery charging structure for coal mine according to claim 1, characterized in that: The battery box includes a box body and a cover body, both of which are metal explosion-proof structural parts. The box body and the cover body are detachably connected and define the explosion-proof cavity. The matching position of the box body and the cover body has a second explosion-proof joint surface.

6. The battery charging structure for coal mines according to claim 5, characterized in that: The battery charging structure for coal mines also includes a threading piece and a wire. The threading piece is arranged on the box body, one end of the wire is connected to the battery, and the other end of the wire passes through the threading piece and is led out of the battery box. A casting material for fixing the wire is arranged inside the threading piece.

7. The battery charging structure for coal mines according to claim 6, characterized in that: The cover body and the box body are threadedly matched, and the second flameproof joint surface is a flameproof thread joint surface, and the length of the flameproof thread joint surface along the thickness direction of the cover body is A, wherein A≥8mm; And / or, a dimension of the casting material along the length direction of the wire is B, wherein B≥20 mm.

8. The battery charging structure for coal mines according to claim 5, characterized in that: The wall thickness of the box body and the wall thickness of the cover body are C, wherein 3mm≤C≤8mm; And / or, the box body and the cover body are made of one of gray cast iron, carbon structural steel and stainless steel.

9. The battery charging structure for coal mines according to claim 5, characterized in that: An ear seat is provided on one side of the box body away from the explosion-proof cavity, and at least two connecting holes are provided on the ear seat.

10. A handheld electric tool, characterized in that: A battery charging structure for coal mines comprising any one of claims 1-9.

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