Electric grinder with replaceable battery pack

Abstract

The utility model belongs to the technical field of electric tools, and particularly relates to an electric grinder with a replaceable battery pack. The electric grinder with the replaceable battery pack comprises a shell, the battery pack and a rear cover, a conductive connector electrically connected with a control panel is arranged in the shell, and a battery bin is arranged at one end of the shell; a conductive connecting part is arranged at one end of the battery pack, the battery pack is inserted into the battery compartment, the conductive connector and the conductive connecting part are inserted and electrically connected, and an abutting part is arranged at the end, away from the conductive connecting part, of the battery pack; the battery pack is sleeved with the rear cover, the first end of the rear cover is detachably connected with the shell, the end, away from the conductive connector, of the battery pack extends out of the second end of the rear cover, an abutting protruding edge is arranged on the inner side of the second end of the rear cover, and the abutting protruding edge abuts against the abutting part. By using the electric grinder with the replaceable battery pack in the technical scheme, the battery pack can be conveniently and quickly replaced.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, specifically relating to an electric grinder with a replaceable battery pack. Background Technology

[0002] An electric grinder is a power tool mainly used for various processing tasks such as grinding, polishing, cutting, and carving. Traditional AC electric grinders have a relatively bulky overall structure, making them inconvenient to use, and they also have a power cord, which makes them difficult to use when grinding small parts.

[0003] In existing technologies, electric grinders with replaceable battery packs typically have a battery compartment inside the housing, which is closed by a rear cover. During battery pack installation, the rear cover and the rear end of the battery pack are first snapped together, then the front end of the battery pack is inserted into the battery compartment, and the rear cover and housing are snapped together again. This installation method requires separate snap-fit ​​structures on both the battery pack and the rear cover to achieve the connection, resulting in complex battery pack and rear cover structures, cumbersome assembly steps, and a poor user experience.

[0004] Therefore, there is a need for an electric grinder with a simple structure and easy battery pack replacement. Utility Model Content

[0005] The purpose of this invention is to at least solve the problems of complex structure and inconvenient battery pack replacement in existing electric grinders. This purpose is achieved through the following technical solution:

[0006] The first aspect of this utility model provides an electric mill with a replaceable battery pack, comprising:

[0007] The housing has a conductive connector that is electrically connected to the control board inside, and a battery compartment is provided at one end of the housing;

[0008] A battery pack, one end of which is provided with a conductive connection part, the battery pack is inserted into the battery compartment, the conductive connector and the conductive connection part are inserted and electrically connected, and the end of the battery pack away from the conductive connection part is provided with an abutment part;

[0009] The rear cover is fitted onto the battery pack. The first end of the rear cover is detachably connected to the housing. The end of the battery pack away from the conductive connector extends from the second end of the rear cover. An abutting protrusion is provided on the inner side of the second end of the rear cover, and the abutting protrusion abuts against the abutting part.

[0010] Using the replaceable battery pack electric grinder in this technical solution, when the battery pack needs to be replaced, the back cover is removed from the housing, and then the battery pack is pulled out, separating the conductive connection part and the conductive connector. When installing the battery pack, it is inserted into the battery compartment until the conductive connection part and the conductive connector connect, allowing the battery pack to supply power normally. Then, the back cover is placed on the battery pack, and the back cover and housing are connected. After the back cover and housing are connected, the abutting protrusion on the back cover automatically abuts against the abutting part of the battery pack, thus preventing the battery pack from falling out of the battery compartment. Therefore, by setting the abutting protrusion and abutting part, the back cover and battery pack do not require a complex connection structure. Thus, the connection step between the back cover and the battery pack is eliminated during battery pack installation and removal. Compared with existing technologies, the installation and removal process is more convenient and faster, and the battery pack can be stably assembled inside the battery compartment.

[0011] In addition, the electric grinder with a replaceable battery pack of this utility model may also have the following additional technical features:

[0012] In some embodiments of this utility model, the outer diameter of the abutment portion gradually decreases from the direction close to the conductive connection portion to the direction far away from the conductive connection portion.

[0013] In some embodiments of this utility model, the abutting part is a ring rib, and the side of the ring rib facing the first end of the rear cover abuts against the abutting protrusion.

[0014] In some embodiments of this utility model, the housing includes a positioning shell, a battery shell, and an outer shell. The positioning shell is disposed inside the outer shell. The control board and the conductive connector are both connected to the positioning shell. One end of the battery shell is inserted into the outer shell and connected to the positioning shell. The battery shell is connected to the outer shell. The end of the battery shell away from the outer shell is detachably connected to the rear cover.

[0015] In some embodiments of this utility model, the inner wall of the back cover is provided with a first snap-fit ​​protrusion, and the end of the battery case away from the outer shell is provided with a first snap-fit ​​part, and the first snap-fit ​​protrusion and the first snap-fit ​​part snap together.

[0016] In some embodiments of this utility model, the first snap-fit ​​portion includes a first insertion groove, a first recess, a first stop protrusion, and a ridge. The first insertion groove is disposed at the edge of the end where the battery housing is connected to the rear cover. The first insertion groove and the first recess are disposed along the circumference of the battery housing. The ridge is disposed between the first insertion groove and the first recess along the axial direction of the battery housing. The first recess and the edge of the battery housing form the first stop protrusion. The first snap-fit ​​protrusion can be inserted into the first insertion groove along the axial direction of the battery housing. The first snap-fit ​​protrusion can rotate in the positive direction and pass through the ridge into the first recess. The ridge is used to circumferentially limit the first snap-fit ​​protrusion, and the first stop protrusion is used to axially limit the first snap-fit ​​protrusion.

[0017] In some embodiments of this utility model, the end of the battery casing away from the outer shell is provided with a clearance groove and a mounting groove, the clearance groove and the mounting groove are connected, the interior of the mounting groove is provided with an elastic element, and the inner wall of the back cover is provided with an elastic element abutment portion. When the first snap-fit ​​protrusion is inserted into the first insertion groove, the elastic element abutment portion is inserted into the clearance groove. When the first snap-fit ​​protrusion enters the first groove, the elastic element abutment portion abuts against the elastic element. The restoring force of the elastic element causes the back cover to have a tendency to rotate in the opposite direction, so that the first snap-fit ​​protrusion abuts against the protrusion.

[0018] In some embodiments of this utility model, a first buckle is provided at one end where the battery casing and the positioning casing are connected, and a first locking hole is provided on the positioning casing, wherein the first buckle and the first locking hole are engaged; a second buckle is provided on the side wall of the battery casing, and a second locking hole is provided on the outer casing, wherein the second locking hole and the second buckle are engaged.

[0019] In some embodiments of this utility model, the battery casing includes a battery casing body and a stepped portion connected to each other, the second buckle is disposed on the battery casing body, the outer diameter of the stepped portion is larger than the outer diameter of the battery casing body, the battery casing body is inserted into the outer shell, the stepped portion abuts against the outer shell, and the back cover and the stepped portion are detachably connected.

[0020] In some embodiments of this utility model, the inner side of the outer casing is provided with a positioning slot extending along the axial direction of the outer casing, and the outer wall of the battery casing is provided with a positioning protrusion, the positioning protrusion and the positioning slot being inserted into each other. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 A schematic diagram of the structure of an electric mill with a replaceable battery pack according to an embodiment of the present invention is shown.

[0023] Figure 2 An exploded view of an electric mill with a replaceable battery pack according to an embodiment of the present invention is shown schematically.

[0024] Figure 3 A schematic diagram of a portion of the structure of an electric grinder with a replaceable battery pack according to an embodiment of the present invention is shown. Figure 1 ;

[0025] Figure 4 A schematic diagram of the structure of the back cover according to an embodiment of the present invention is shown;

[0026] Figure 5 A schematic cross-sectional view of the rear cover according to an embodiment of the present invention is shown.

[0027] Figure 6 A schematic diagram of a portion of the structure of an electric grinder with a replaceable battery pack according to an embodiment of the present invention is shown. Figure 2 ;

[0028] Figure 7 A schematic diagram of the structure of a battery casing according to an embodiment of the present invention is shown.

[0029] Figure 8 A schematic cross-sectional view of a battery casing according to an embodiment of the present invention is shown.

[0030] Figure 9 A schematic diagram of the structure of a battery pack according to an embodiment of the present invention is shown.

[0031] The labels in the attached diagram are as follows:

[0032] 100. Shell;

[0033] 110. Positioning shell; 111. Conductive connector; 112. Control board; 113. First card hole;

[0034] 120. Battery casing; 121. Battery casing body; 1211. Second buckle; 1212. Positioning protrusion; 1213. First buckle; 122. Stepped portion; 1221. First engaging portion; 1221a. First groove; 1221b. First insertion groove; 1221c. Protruding ridge; 1221d. First stop protrusion; 1222. Second engaging portion; 1222a. Second groove; 1222b. Second insertion groove; 1222c. Second stop protrusion; 1223. Clearance groove; 1224. Mounting groove; 1225. Elastic element;

[0035] 130. Outer casing; 131. Second clasp;

[0036] 200. Battery pack; 210. Conductive connection part; 220. Abutment part; 230. Guide groove; 240. Handle;

[0037] 300, back cover; 310, abutting protrusion; 320, first snap-fit ​​protrusion; 330, second snap-fit ​​protrusion; 340, elastic abutment part; 350, elastic protrusion;

[0038] 400. Drive assembly; 500. Transmission assembly. Detailed Implementation

[0039] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0040] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0041] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0042] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0043] Figure 1 A schematic diagram of the structure of an electric mill with a replaceable battery pack according to an embodiment of the present invention is shown. Figure 2 An exploded view of an electric grinder with a replaceable battery pack according to an embodiment of the present invention is shown schematically. Figure 3 A schematic diagram of a portion of the structure of an electric grinder with a replaceable battery pack according to an embodiment of the present invention is shown. Figures 1 to 3 As shown, this utility model proposes an electric grinder with a replaceable battery pack, which is equipped with a control board 112. The electric grinder with a replaceable battery pack includes a housing 100, a battery pack 200, and a rear cover 300. The housing 100 has a conductive connector 111 that is electrically connected to the control board 112 inside, and a battery compartment is provided at one end of the housing 100. A conductive connection part 210 is provided at one end of the battery pack 200, and the battery pack 200 is inserted into the battery compartment. The conductive connector 111 and the conductive connection part 210 are inserted and electrically connected. An abutment part 220 is provided at the end of the battery pack 200 away from the conductive connection part 210. The rear cover 300 is sleeved on the battery pack 200. The first end of the rear cover 300 is detachably connected to the housing 100. The end of the battery pack 200 away from the conductive connector 111 extends from the second end of the rear cover 300. An abutment protrusion 310 is provided on the inner side of the second end of the rear cover 300, and the abutment protrusion 310 abuts against the abutment part 220.

[0044] When using the replaceable battery pack electric grinder in this technical solution, to replace the battery pack 200, remove the back cover 300 from the housing 100, and then pull out the battery pack 200 to separate the conductive connection part 210 and the conductive connector 111. When installing the battery pack 200, insert the battery pack 200 into the battery compartment until the conductive connection part 210 and the conductive connector 111 are connected so that the battery pack 200 can supply power normally. Then, put the back cover 300 on the battery pack 200 and connect the back cover 300 to the housing 100. After the back cover 300 and the housing 100 are connected, the abutting protrusion 310 on the back cover 300 automatically abuts against the abutting part 220 of the battery pack 200, thereby preventing the battery pack 200 from falling out of the battery compartment. As can be seen, by setting the abutting ridge 310 and the abutting part 220, the rear cover 300 and the battery pack 200 do not need to be set with a complicated connection structure. Therefore, when installing or removing the battery pack 200, the connection steps between the rear cover 300 and the battery pack 200 are also eliminated. Compared with the prior art, the installation and removal process is more convenient and faster. In addition, the battery pack 200 can be stably assembled inside the battery compartment.

[0045] Furthermore, the housing 100 internally houses a drive assembly 400 and a transmission assembly 500. The transmission assembly 500 is connected to a tool head, and the drive assembly 400 drives the transmission assembly 500 to rotate, which in turn drives the tool head to rotate. The control board 112 is electrically connected to the drive assembly 400 and can control the operation of the drive assembly 400. When the conductive connection part 210 of the battery pack 200 is connected to the conductive connector 111, the battery pack 200 can supply power to the drive assembly 400 through the control board 112.

[0046] Figure 4 A schematic structural diagram of the back cover 300 according to an embodiment of the present invention is shown. See also Figure 4 The abutment ridge 310 is provided around the inner side of the back cover 300. Optionally, the outer side of the second end of the back cover 300 is rounded to make the appearance more aesthetically pleasing.

[0047] Further, see Figure 3 In this embodiment, the outer diameter of the contact portion 220 gradually decreases from the direction close to the conductive connection portion 210 to the direction away from the conductive connection portion 210.

[0048] The abutment part 220 adopts this structural form, which makes the overall appearance of the battery pack 200 smooth and simple and beautiful. It can also achieve abutment with the abutment protrusion 310, effectively preventing the battery pack 200 from shaking in the battery compartment, which would cause the conductive connection part 210 and the conductive connector 111 to be unstable.

[0049] Furthermore, in other embodiments, the abutment portion 220 may also be a ring rib, with the side of the ring rib facing the first end of the rear cover 300 abutting against the abutment protrusion 310.

[0050] Understandably, the ring rib structure can also achieve contact with the abutting protrusion 310. By applying a certain axial force to the ring rib through the rear cover 300, the conductive connection part 210 of the battery pack 200 and the conductive connector 111 are stably connected, ensuring that the battery pack 200 can continuously and stably supply power.

[0051] Further, see also Figure 2 and Figure 3 The housing 100 includes a positioning housing 110, a battery housing 120, and an outer housing 130. The positioning housing 110 is disposed inside the outer housing 130. The control board 112 and the conductive connector 111 are both connected to the positioning housing 110. One end of the battery housing 120 is inserted into the outer housing 130 and connected to the positioning housing 110. The battery housing 120 and the outer housing 130 are connected. The end of the battery housing 120 away from the outer housing 130 is detachably connected to the rear cover 300.

[0052] The positioning housing 110 is located between the drive assembly 400 and the battery pack 200, providing stable support for the control board 112 and the conductive connector 111. The connection between the positioning housing 110 and the battery housing 120, as well as the connection between the outer casing 130 and the battery housing 120, ensures the stability and compactness of the overall structure. Furthermore, it facilitates the installation and disassembly of internal components, effectively improving assembly efficiency and simplifying future maintenance.

[0053] Further, see Figure 2 A first buckle 1213 is provided at one end where the battery housing 120 and the positioning housing 110 are connected, and a first locking hole 113 is provided on the positioning housing 110. The first buckle 1213 and the first locking hole 113 are engaged. A second buckle 1211 is provided on the side wall of the battery housing 120, and a second locking hole 131 is provided on the outer shell 130. The second locking hole 131 and the second buckle 1211 are engaged.

[0054] With this structure, the connection between the battery housing 120 and the positioning housing 110, as well as the connection between the battery housing 120 and the outer housing 130, is very convenient. Simply move the battery housing 120 along its axial direction so that the first latch 1213 engages with the first latch hole 113, and simultaneously, the second latch 1211 engages with the second latch hole 131. Optionally, there are two first latches 1213, symmetrically arranged, and correspondingly, there are two first latch holes 113, each corresponding to one of the two first latches 1213. Of course, the number of first latches 1213 can also be three, four, or five, depending on the usage requirements. Optionally, there are two second latches 1211, symmetrically arranged, and correspondingly, there are two second latch holes 131, each corresponding to one of the two second latches 1211.

[0055] Furthermore, the battery case 120 includes a battery case body 121 and a stepped portion 122 connected to each other. A second buckle 1211 is provided on the battery case body 121. The outer diameter of the stepped portion 122 is larger than the outer diameter of the battery case body 121. The battery case body 121 is inserted into the outer shell 130. The stepped portion 122 and the outer shell 130 abut against each other. The rear cover 300 and the stepped portion 122 are detachably connected.

[0056] By adopting this structure, the step portion 122 can serve a positioning function. When the step portion 122 abuts against the outer casing 130, it indicates that the battery casing 120 is installed in place. In addition, the thickness of the step portion 122 is greater than the thickness of the battery casing body 121, thus the structural strength of the step portion 122 is higher.

[0057] Furthermore, the inner side of the outer casing 130 is provided with a positioning slot (not shown in the figure) extending along the axial direction of the outer casing 130, and the outer wall of the battery casing 120 is provided with a positioning protrusion 1212, which is inserted into the positioning slot.

[0058] When assembling the battery case 120 and the outer casing 130, align the positioning protrusion 1212 with the positioning slot, and insert the battery case 120 into the interior of the outer casing 130 along the axial direction of the battery case 120. In addition, the positioning protrusion 1212 also serves as a circumferential limit to prevent relative rotation between the battery case 120 and the outer casing 130.

[0059] Figure 5 A schematic cross-sectional view of the back cover 300 according to an embodiment of the present invention is shown. Figure 6 A schematic diagram of the battery casing 120 according to an embodiment of the present invention is shown from a certain perspective. Figure 7 A schematic diagram of the battery casing 120 according to an embodiment of the present invention is shown from another perspective. Figure 8A schematic cross-sectional view of the battery casing 120 according to an embodiment of the present invention is shown. See also Figures 4 to 8 The inner wall of the back cover 300 is provided with a first snap-fit ​​protrusion 320, and the end of the battery case 120 away from the outer casing 130 is provided with a first snap-fit ​​part 1221, and the first snap-fit ​​protrusion 320 and the first snap-fit ​​part 1221 snap-fit ​​together.

[0060] The connection between the back cover 300 and the battery case 120 is achieved through the first snap-fit ​​protrusion 320 and the first snap-fit ​​part 1221, which is convenient and can effectively prevent the back cover 300 from falling off the battery case 120.

[0061] Furthermore, the first snap-fit ​​portion 1221 includes a first insertion groove 1221b, a first recess 1221a, a first stop protrusion 1221d, and a ridge 1221c. The first insertion groove 1221b is disposed on the edge of the end where the battery housing 120 is connected to the rear cover 300. The first insertion groove 1221b and the first recess 1221a are disposed along the circumference of the battery housing 120. The ridge 1221c is disposed between the first insertion groove 1221b and the first recess 1221a, along the circumference of the battery housing 120. Axially, the first groove 1221a and the edge of the battery case 120 form a first stop protrusion 1221d. The first snap-fit ​​protrusion 320 can be inserted into the first insertion groove 1221b along the axial direction of the battery case 120. The first snap-fit ​​protrusion 320 can rotate in the positive direction and enter the first groove 1221a through the protrusion 1221c. The protrusion 1221c is used to circumferentially limit the first snap-fit ​​protrusion 320, and the first stop protrusion 1221d is used to axially limit the first snap-fit ​​protrusion 320.

[0062] Using this connection structure, when installing the back cover 300, first align the first snap-fit ​​protrusion 320 with the first insertion slot 1221b, and insert the first snap-fit ​​protrusion 320 into the first insertion slot 1221b along the axial direction of the back cover 300. Then, rotate the back cover 300 clockwise so that the first snap-fit ​​protrusion 320 passes over the ridge 1221c. At this point, the first snap-fit ​​protrusion 320 and the first stop protrusion 1221d are aligned, so the first stop protrusion 1221d can axially limit the first snap-fit ​​protrusion 320, and the ridge 1221c can circumferentially limit the first snap-fit ​​protrusion 320. Therefore, the back cover 300 will not fall off the battery case 120. Optionally, the clockwise direction can be counterclockwise or counterclockwise, depending on the usage requirements. This connection structure has high strength, good connection stability, is not easily damaged, and is easy to install. Optionally, there are two first snap-fit ​​protrusions 320, which are symmetrically arranged, and correspondingly, there are two first snap-fit ​​portions 1221.

[0063] Optionally, the inner wall of the rear cover 300 is provided with a second snap-fit ​​protrusion 330, and the end of the battery housing 120 away from the outer casing 130 is provided with a second snap-fit ​​portion 1222, which snaps together with the second snap-fit ​​protrusion 330. The second snap-fit ​​portion 1222 includes a second insertion groove 1222b, a second groove 1222a, and a second stop protrusion 1222c. The second insertion groove 1222b is located at the edge of the end of the battery housing 120 connected to the rear cover 300. The second insertion groove 1222b and the second groove 1222a are arranged along the circumference of the battery housing 120 and are connected. Along the axial direction of the battery housing 120, the second groove 1222a and the edge of the battery housing 120 form the second stop protrusion 1222c. When installing the back cover 300 and the battery case 120, when the second snap-fit ​​protrusion 330 is inserted into the second insertion groove 1222b along the axial direction of the battery case 120, the back cover 300 is rotated in the positive direction so that the second snap-fit ​​protrusion 330 enters the second groove 1222a. At this time, the second stop protrusion 1222c axially limits the second snap-fit ​​protrusion 330.

[0064] Furthermore, the end of the battery casing 120 away from the outer casing 130 is provided with a clearance groove 1223 and a mounting groove 1224, which are connected. An elastic element 1225 is provided inside the mounting groove 1224, and an elastic element abutment part 220 is provided on the inner wall of the rear cover 300. When the first snap-fit ​​protrusion 320 is inserted into the first insertion groove 1221b, the elastic element abutment part 220 is inserted into the clearance groove 1223. When the first snap-fit ​​protrusion 320 enters the first groove 1221a, the elastic element abutment part 220 and the elastic element 1225 abut against each other. The restoring force of the elastic element 1225 causes the rear cover 300 to have a tendency to rotate in the opposite direction, so that the first snap-fit ​​protrusion 320 and the protrusion 1221c abut against each other.

[0065] Understandably, the restoring force of the elastic element 1225 allows the first snap-fit ​​protrusion 320 to tightly abut against the protrusion 1221c, thereby preventing the rear cover 300 from rotating relative to the battery case 120 and ensuring the stability of the connection between the two. Optionally, the elastic element 1225 can be a spring or a retaining ring, etc.

[0066] Figure 9 A schematic structural diagram of a battery pack 200 according to an embodiment of the present invention is shown. See also Figure 6 , Figure 8 and Figure 9A handle 240 is provided at the end of the battery pack 200 away from the conductive connection portion 210 for easy holding. A guide groove 230 extending axially is provided on the side wall of the battery pack 200, and a guide protrusion (not shown) is provided on the inner wall of the battery compartment. When installing the battery pack 200, the guide groove 230 is aligned with the guide protrusion, allowing the battery pack 200 to be inserted into the battery compartment. Once the battery pack 200 is fully inserted, the end of the guide groove 230 is located outside the battery compartment. Correspondingly, a resilient protrusion 350 is provided on the rear cover 300. When installing the rear cover 300, the resilient protrusion 350 must be aligned with the guide groove 230. When the rear cover 300 is fully installed, the resilient protrusion 350 is located inside the guide groove 230. Thus, the resilient protrusion 350 serves to indicate the installation position and increase connection stability. Optionally, the resilient protrusion 350 can be a rubber protrusion that automatically contracts under pressure and automatically springs back after installation.

[0067] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack replaceable electric grinder provided with a control panel (112), characterized in that, The electric grinding of the replaceable battery pack comprises: a shell (100), an inside of the shell (100) is provided with a conductive connector (111) electrically connected with the control board (112), one end of the shell (100) is provided with a battery compartment; a battery pack (200), one end of the battery pack (200) is provided with a conductive connection part (210), the battery pack (200) is inserted into the battery compartment, the conductive connector (111) and the conductive connection part (210) are plugged and electrically connected, one end of the battery pack (200) away from the conductive connection part (210) is provided with an abutting part (220); a rear cover (300), the rear cover (300) is sleeved on the battery pack (200), a first end of the rear cover (300) is detachably connected with the shell (100), one end of the battery pack (200) away from the conductive connector (111) extends from a second end of the rear cover (300), an inner side of the second end of the rear cover (300) is provided with an abutting convex rib (310), the abutting convex rib (310) and the abutting part (220) abut.

2. The battery pack changeable power tool according to claim 1, wherein, From the direction close to the conductive connection part (210) to the direction away from the conductive connection part (210), the outer diameter of the abutting part (220) gradually decreases.

3. The battery pack changeable power tool of claim 1, wherein, The abutting part (220) is a ring rib, one side of the ring rib towards the first end of the rear cover (300) abuts with the abutting convex rib (310).

4. The battery pack replaceable electric sander according to any one of claims 1-3, characterized in that, The shell (100) comprises a positioning shell (110), a battery shell (120) and an outer shell (130), the positioning shell (110) is arranged in the inside of the outer shell (130), the control board (112) and the conductive connector (111) are connected to the positioning shell (110), one end of the battery shell (120) is inserted into the outer shell (130) and connected with the positioning shell (110), the battery shell (120) is connected with the outer shell (130), one end of the battery shell (120) away from the outer shell (130) is detachably connected with the rear cover (300).

5. The battery pack changeable power tool of claim 4, wherein, An inner wall of the rear cover (300) is provided with a first clamping protrusion (320), one end of the battery shell (120) away from the outer shell (130) is provided with a first clamping part (1221), the first clamping protrusion (320) and the first clamping part (1221) are clamped.

6. The battery pack changeable power tool of claim 5, wherein, The first clamping part (1221) comprises a first insertion slot (1221b), a first groove (1221a), a first stop protrusion (1221d) and a convex rib (1221c), the first insertion slot (1221b) is arranged at the edge of one end of the battery shell (120) connected with the rear cover (300), the first insertion slot (1221b) and the first groove (1221a) are arranged along the circumferential direction of the battery shell (120), the convex rib (1221c) is arranged between the first insertion slot (1221b) and the first groove (1221a) along the axial direction of the battery shell (120), the first groove (1221a) and the edge of the battery shell (120) form the first stop protrusion (1221d), the first clamping protrusion (320) can be inserted into the first insertion slot (1221b) along the axial direction of the battery shell (120), the first clamping protrusion (320) can rotate in the positive direction and enter the first groove (1221a) through the convex rib (1221c), the convex rib (1221c) is used for circumferential positioning of the first clamping protrusion (320), and the first stop protrusion (1221d) is used for axial positioning of the first clamping protrusion (320).

7. The battery pack changeable power tool of claim 6, wherein, The end of the battery shell (120) away from the shell (130) is provided with a avoiding slot (1223) and a mounting slot (1224), the avoiding slot (1223) and the mounting slot (1224) are communicated, the inside of the mounting slot (1224) is provided with an elastic member (1225), the inner wall of the rear cover (300) is provided with an elastic member abutting portion (220), when the first clamping protrusion (320) is inserted into the first insertion slot (1221b), the elastic member abutting portion (220) is inserted into the avoiding slot (1223), after the first clamping protrusion (320) enters the first groove (1221a), the elastic member abutting portion (220) and the elastic member (1225) abut, and the restoring force of the elastic member (1225) makes the rear cover (300) have a tendency to rotate in the reverse direction, so that the first clamping protrusion (320) and the convex rib (1221c) abut.

8. The battery pack changeable power tool of claim 4, wherein, The end of the battery shell (120) connected with the positioning shell (110) is provided with a first buckle (1213), the positioning shell (110) is provided with a first clamping hole (113), and the first buckle (1213) and the first clamping hole (113) are clamped; the side wall of the battery shell (120) is provided with a second buckle (1211), the shell (130) is provided with a second clamping hole (131), and the second clamping hole (131) and the second buckle (1211) are clamped.

9. The replaceable battery pack electric sander of claim 8, wherein, The battery shell (120) comprises a battery shell body (121) and a step portion (122) connected with each other, the second buckle (1211) is arranged on the battery shell body (121), the outer diameter of the step portion (122) is greater than that of the battery shell body (121), the battery shell body (121) is inserted into the shell (130), the step portion (122) and the shell (130) are in abutment, and the rear cover (300) and the step portion (122) are detachably connected.

10. The battery pack changeable power tool of claim 4, wherein, The inner side of the shell (130) is provided with a positioning slot extending along the axial direction of the shell (130), and the outer wall of the battery shell (120) is provided with a positioning protrusion (1212), the positioning protrusion (1212) and the positioning slot are inserted.

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