Lithium electric angle grinder

Abstract

The utility model discloses a kind of lithium electricity angle mills, including shell, base and shroud. Base is located in shell, and the side of base away from shell is protrudingly provided with mounting table, and the outer side wall of mounting table is provided with multiple cooperation parts along its circumference. The shroud includes inner ring plate and outer cover body, and the outer periphery of mounting table is movably sleeved with inner ring plate. The inner ring plate is provided with movable clamping portion along its radial direction, and when inner ring plate is sleeved in place, clamping portion is positionally corresponding with cooperation part. The outer periphery of inner ring plate is sleeved with outer cover body, and the inner wall of outer cover body is protrudingly provided with protrusion. Outer cover body is axially movable relative to inner ring plate, and it has first position and second position on its activity stroke. In first position, protrusion is directly opposite clamping portion, so that clamping portion is clamped and fixed with corresponding cooperation part. In second position, protrusion is misaligned with clamping portion, so that clamping portion can be movable and separated from cooperation part, so that inner ring plate can be circumferentially rotated relative to mounting table and axially movable.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a lithium-ion angle grinder. Background Technology

[0002] A lithium-ion battery angle grinder is a portable power tool powered by a lithium battery, widely used in metal processing, stone cutting, and construction and decoration industries. Lithium-ion battery angle grinders are typically equipped with a protective cover to prevent flying debris. During routine use, the cover needs to be disassembled and reassembled for maintenance or to replace it with a different size. In existing technology, a quick-change mechanism is usually incorporated into the cover for ease of disassembly and assembly. However, this quick-change mechanism is complex, difficult to operate, and limits the angle adjustment of the cover. Utility Model Content

[0003] The main purpose of this invention is to propose a lithium-ion battery angle grinder, which aims to solve the problems of complex quick-change cover structure, difficult operation, and limited angle adjustment of existing lithium-ion battery angle grinders.

[0004] To achieve the above objectives, this utility model proposes a lithium-ion battery angle grinder, comprising:

[0005] chassis;

[0006] A base, disposed on the housing, has a mounting platform protruding from its side opposite to the housing; the outer side wall of the mounting platform is provided with a plurality of mating parts along its circumference; and,

[0007] The protective cover includes an inner ring plate and an outer cover. The inner ring plate is movably fitted around the periphery of the mounting platform. The inner ring plate has a movable locking part arranged radially thereon, and when the inner ring plate is fitted into place, the locking part corresponds to the mating part. The outer cover is fitted around the periphery of the inner ring plate, and its inner wall has a protrusion. The outer cover can move axially relative to the inner ring plate and has a first position and a second position in its movement stroke. In the first position, the protrusion faces the locking part so that the locking part is locked and fixed with the corresponding mating part. In the second position, the protrusion is misaligned with the locking part so that the locking part can move and disengage from the mating part, so that the inner ring plate can rotate circumferentially and move axially relative to the mounting platform.

[0008] Optionally, an annular groove is formed on the outer wall of the inner ring plate in the circumferential direction, and a mounting hole is formed on the bottom wall of the annular groove, with the locking part movably disposed in the mounting hole;

[0009] The protrusion on the inner wall of the outer cover is arranged in a ring. At the first position, the protrusion is placed in the annular groove so that the locking part extends out of the mounting hole and protrudes from the inner wall of the inner ring plate. The protruding part of the locking part is locked and fixed with the mating part.

[0010] Optionally, at least two card parts are provided, and the two card parts are symmetrically arranged in the radial direction of the inner ring plate. The number of mating parts is an integer multiple of the number of card parts.

[0011] Optionally, the protective cover further includes a guide groove and a guide post that fit together. The guide groove and the guide post are both arranged axially. One of them is located on the outer wall of the inner ring plate and is offset from the card portion in the circumferential direction. The other is located on the inner wall of the outer cover.

[0012] Optionally, the protective cover further includes a first limiting part, a second limiting part, and a spring. The first limiting part is circumferentially disposed on the outer wall of the inner ring plate and located on the side of the protrusion away from the base, for axially limiting the protrusion. The second limiting part is circumferentially disposed on the outer wall of the inner ring plate and located on the side of the protrusion closer to the base. The spring is disposed between the second limiting part and the protrusion.

[0013] Optionally, an annular clearance groove is formed on the outer wall of the inner ring plate in the circumferential direction, and the clearance groove is located close to the base;

[0014] The protective cover also includes a retaining ring and a washer. The retaining ring is engaged in the clearance groove and partially protrudes from the opening of the clearance groove. The washer is arranged around the outer periphery of the inner ring plate. The washer is located on the protruding part of the retaining ring and is located on the side of the retaining ring facing the protrusion.

[0015] The second limiting part includes the retaining ring and the washer, and the spring is disposed between the washer and the protrusion.

[0016] Optionally, a limiting rib is provided at the connection between the base and the mounting platform, and when the inner ring plate is fitted into the mounting platform, the end face of the inner ring plate abuts against the end face of the limiting rib.

[0017] Optionally, the outer side wall of the mounting platform is provided with a plurality of slots along its circumference;

[0018] The inner ring plate is provided with movable steel balls or locking posts along its radial direction. In the first position, the protrusion is directly opposite the steel ball or locking post so that the steel ball or locking post can be inserted into the corresponding locking groove. In the second position, the protrusion is misaligned with the steel ball or locking post so that the steel ball or locking post can move out of the locking groove.

[0019] The mating part includes the slot, and the locking part includes the steel ball or locking post.

[0020] Optionally, the number of mating parts is set to N, where 4 ≤ N ≤ 32.

[0021] Optionally, a transition slope is formed between the side face of the protrusion facing away from the base and the side face.

[0022] The technical solution provided by this utility model has at least the following advantages:

[0023] This utility model provides a lithium-ion battery angle grinder, including a housing, a base, and a protective cover. The base is located on the housing, and a mounting platform protrudes from the side opposite to the housing. Multiple mating parts are arranged on the outer side wall of the mounting platform. The protective cover includes an inner ring plate and an outer cover body that are movably fitted together. A movable locking part is provided on the inner ring plate, and a protrusion protrudes from the inner side of the outer cover body. During assembly, the entire protective cover is fitted onto the mounting platform, and the outer cover body is pushed relative to the inner ring plate to a second position, causing the protrusion and the locking part to misalign, thereby providing clearance for the locking part to move. The outer cover body is then pushed towards the base, and under the action of pressure, the locking part can move radially outward, allowing the inner ring plate to move smoothly. When the inner ring plate is fitted into place, the locking part on the inner ring plate aligns with the mating part on the mounting platform. The outer cover body is then moved relative to the inner ring plate to a first position, so that the protrusion and the locking part are directly opposite each other. The protrusion pushes the locking part to move radially inward until it is locked and fixed with the mating part, thereby achieving the assembly and fixation of the protective cover and the base. During disassembly, the outer cover is pushed relative to the inner ring plate to the second position, causing the protrusion and the locking part to misalign, thus providing clearance for the locking part's movement. At this point, the inner ring plate is pulled outwards. Under radial pressure, the locking part moves radially outwards until it disengages from the mating part. The user can then pull the entire cover away from the mounting platform by pulling out the inner ring plate, thereby achieving disassembly of the cover from the base. Thus, this solution, through the cooperation of the mating part, the locking part, and the protrusion, enables quick replacement of the cover for the lithium-ion angle grinder. The structure is simple and the operation is convenient. Furthermore, when the outer cover is pushed relative to the inner ring plate to the second position, the protrusion and the locking part misalign, allowing the entire cover to rotate circumferentially. The cover can rotate 360° circumferentially without limitation, meeting any angle requirement. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1A structural schematic diagram of an assembly of a protective cover and a base provided by this utility model;

[0026] Figure 2 for Figure 1 Exploded view of the assembly;

[0027] Figure 3 for Figure 1 A cross-sectional view of the assembly along AA;

[0028] Figure 4a for Figure 1 A first structural schematic diagram of the assembly during installation;

[0029] Figure 4b for Figure 1 A second structural schematic diagram of the assembly during installation;

[0030] Figure 4c for Figure 1 A third structural diagram of the assembly during installation;

[0031] Figure 4d for Figure 1 The fourth structural diagram of the assembly during installation;

[0032] Figure 4e for Figure 1 The fifth structural diagram of the assembly during installation;

[0033] Figure 5a for Figure 1 A first structural diagram of the assembly during disassembly;

[0034] Figure 5b for Figure 1 A second structural diagram of the assembly during disassembly;

[0035] Figure 5c for Figure 1 A third structural diagram of the assembly during disassembly;

[0036] Figure 5d for Figure 1 A fourth structural diagram of the assembly during disassembly;

[0037] Figure 6a for Figure 1 A first structural schematic diagram of the assembly during rotation;

[0038] Figure 6b for Figure 1 A second structural schematic diagram of the assembly during rotation;

[0039] Figure 6c for Figure 1The third structural diagram of the assembly during rotation.

[0040] Explanation of icon numbers:

[0041] 100 Lithium-ion Battery Angle Grinder; 1 Base; 2 Mounting Platform; 21 Slot; 3 Protective Cover; 31 Inner Ring Plate; 311 Annular Groove; 312 Mounting Hole; 313 Clearance Groove; 32 Outer Cover; 33 First Limiting Part; 34 Second Limiting Part; 341 Snap Ring; 342 Washer; 35 Spring; 41 Mating Part; 42 Snap Part; 421 Steel Ball; 43 Protrusion; 431 Transition Inclined Surface; 51 Guide Groove; 52 Guide Post; 6 Limiting Rib; F1 Circumferential; F2 Axial.

[0042] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0045] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0046] A lithium-ion battery angle grinder is a portable power tool powered by a lithium battery, widely used in metal processing, stone cutting, and construction and decoration industries. Lithium-ion battery angle grinders are typically equipped with a protective cover to prevent flying debris. During routine use, the protective cover needs to be removed and installed during machine repairs or when replacing it with a different size.

[0047] To facilitate the user's disassembly and assembly of the protective cover 3, this utility model improves the lithium-ion angle grinder 100. The structure of the lithium-ion angle grinder 100 will be described in detail below with reference to the accompanying drawings.

[0048] Please see Figures 1 to 3 The lithium-ion battery angle grinder 100 includes a housing, a base 1, and a protective cover 3. The base 1 is disposed on the housing, and a mounting platform 2 protrudes from the side of the base away from the housing. Multiple mating parts 41 are provided on the outer side wall of the mounting platform 2 along its circumference F1. In this embodiment, the mounting platform 2 and the base 1 are integrally formed. The mounting platform 2, the base 1, and the housing cooperate to form a space for accommodating gears.

[0049] The protective cover 3 includes an inner ring plate 31 and an outer cover body 32. The inner ring plate 31 is movably sleeved on the periphery of the mounting platform 2. The inner ring plate 31 is provided with a movable locking part 42 along its radial direction. When the inner ring plate 31 is sleeved in place, the locking part 42 corresponds to the mating part 41.

[0050] The outer cover 32 is fitted around the inner ring plate 31, and its inner wall has a protrusion 43. The outer cover 32 can move relative to the inner ring plate 31 along its axial direction F2, and has a first position and a second position in its movement stroke. In the first position, the protrusion 43 is directly opposite the locking part 42, so that the locking part 42 is locked and fixed with the corresponding mating part 41. In the second position, the protrusion 43 is misaligned with the locking part 42, so that the locking part 42 can move and disengage from the mating part 41, so that the inner ring plate 31 can rotate relative to the mounting platform 2 in the circumferential direction F1 and move in the axial direction F2.

[0051] The lithium-ion angle grinder 100 provided by this utility model includes a housing, a base 1, and a protective cover 3. The base 1 is disposed on the housing, and a mounting platform 2 protrudes from the side opposite to the housing. Multiple mating parts 41 are arranged on the outer side wall of the mounting platform 2. The protective cover 3 includes an inner ring plate 31 and an outer cover body 32 that are movably fitted together. A movable locking part 42 is provided on the inner ring plate 31, and a protrusion 43 protrudes from the inner side of the outer cover body 32.

[0052] Please see Figures 4a to 4e , Figures 4a to 4e This is a structural diagram showing the assembly of the protective cover 3 and the base 1. Please refer to the diagram during assembly. Figure 4a and Figure 4b First, place the entire protective cover 3 onto the mounting platform 2; please refer to... Figure 4c The outer cover 32 is moved relative to the inner ring plate 31 to the second position (see...). Figure 4bSince the locking part 42 is engaged with the edge of the mounting platform 2, the outer cover 32 can move relative to the inner ring plate 31, causing the protrusion 43 to be misaligned with the locking part 42, thereby providing clearance for the movement of the locking part 42; please refer to Figure 4c Continue pushing the outer cover 32 towards the base 1. At this time, under the action of the squeezing force, the locking part 42 can move radially outward, so that the inner ring plate 31 can move smoothly; please refer to Figure 4d When the inner ring plate 31 is fitted into place, the locking part 42 on the inner ring plate 31 aligns with the mating part 41 on the mounting platform 2; please refer to Figure 4e Then, the outer cover 32 is moved to the first position relative to the inner ring plate 31, so that the protrusion 43 and the locking part 42 are facing each other. The protrusion 43 pushes the locking part 42 to move radially inward until it is locked and fixed with the mating part 41, thereby realizing the assembly and fixing of the cover 3 and the base 1.

[0053] Please see Figures 5a to 5d , Figures 5a to 5d This is a schematic diagram showing the disassembly of the protective cover 3 and the base 1. Please refer to the diagram for disassembly instructions. Figure 5a and Figure 5b This pushes the outer cover 32 relative to the inner ring plate 31 to the second position, causing the protrusion 43 to be misaligned with the locking part 42, thereby providing clearance for the movement of the locking part 42; please refer to Figure 5c At this point, the inner ring plate 31 is pulled outward. Under the action of radial extrusion force, the locking part 42 moves radially outward until it disengages from the mating part 41. Please refer to [link / reference]. Figure 5d Users can remove the entire protective cover 3 from the mounting platform 2 by pulling out the inner ring plate 31, thereby disassembling the protective cover 3 from the base 1. In this way, through the cooperation of the mating part 41, the locking part 42 and the protrusion 43, the protective cover 3 of the lithium battery angle grinder 100 can be quickly replaced. The structure is simple and the operation is convenient.

[0054] And, please see Figures 6a to 6c ,6a to Figure 6c A schematic diagram showing the structure for adjusting the shield at three angles. Please refer to [link / reference]. Figure 6a and Figure 6b When the outer cover 32 is moved relative to the inner ring plate 31 to the second position, the protrusion 43 and the locking part 42 are misaligned; please refer to Figure 6c At this time, the entire protective cover 3 can be rotated along the circumferential direction F1, and the protective cover 3 can rotate 360° along the circumferential direction F1 of the inner ring plate 31. The rotation angle is not limited and can meet any angle requirement.

[0055] This invention does not impose a specific limitation on the number of card sections 42. Two card sections 42 may be provided, or multiple card sections 42 may be provided.

[0056] In one embodiment, please refer to Figure 2At least two locking parts 42 are provided, which can not only bear the force simultaneously when the structure is subjected to radial force or torque, thus preventing a single locking part 42 from deforming or breaking due to excessive force; but also form multi-point constraints with the mating part 41 under complex working conditions such as vibration and impact, limiting the displacement of the components and maintaining structural stability.

[0057] Meanwhile, compared to the asymmetrical design of the two locking parts 42, symmetrically arranging the two locking parts 42 in the radial direction of the inner ring plate 31 not only ensures high center positioning accuracy of the component in the radial direction and avoids shaking or displacement caused by center of gravity shift, but also reduces local stress concentration and extends the service life of the component.

[0058] Furthermore, the number of mating parts 41 is an integer multiple of the number of locking parts 42; not only does it eliminate the need for precise alignment of a single position during assembly, reducing installation time and lowering operational precision requirements, but it also allows for switching to different mating parts 41 for locking and fixing after the outer cover 3 is rotated and adjusted.

[0059] Specifically, four card parts 42 are provided. In the radial direction of the inner ring plate 31, the four card parts 42 are symmetrical in pairs, and the axes of symmetry of the two sets of card parts 42 are orthogonal.

[0060] When the structure is subjected to torque and radial impact, the force on the two symmetrical locking parts 42 will be concentrated on a single line of symmetry, which can easily lead to stress overload in that area. The four orthogonal locking parts 42, on the other hand, can transmit the force synchronously from four directions, reducing the force per unit area and preventing the inner ring plate 31 or the locking parts 42 from deforming or even breaking due to excessive local stress. At the same time, the four orthogonal locking parts 42 can form a cross-shaped locating pin, which restricts the radial displacement of the inner ring plate 31 and ensures that the inner ring plate 31 and the mating part 41 always remain coaxial and will not cause eccentric wobbling.

[0061] This invention does not impose a specific limitation on the number of mating parts 41. The number of mating parts 41 is set to N, where 4 ≤ N ≤ 32. The number of mating parts 41 determines the minimum angle that the protective cover 3 can be adjusted in a single operation.

[0062] For example, when there are four mating parts 41, each of the four mating parts 41 corresponds to one of the four locking parts 42. In this case, the minimum angle of a single rotation of the cover is 90°. That is, when the outer cover 32 moves to the second position, the entire cover is rotated 90° so that the locking part 42 can disengage from the current mating part 41 and rotate to correspond with the adjacent mating part 41. When the outer cover 32 moves to the first position, the locking part 42 engages with the new mating part 41, thereby achieving the angle adjustment of the cover.

[0063] For example, when there are 32 mating parts 41, the central angle between two adjacent mating parts 41 is 11.25°, and the minimum single rotation angle of the cover is 11.25°. That is, when the outer cover 32 moves to the second position, the entire cover rotates 11.25° so that the locking part 42 can disengage from the current mating part 41 and rotate to correspond with the adjacent mating part 41. The outer cover 32 moves to the first position, and the locking part 42 engages with the new mating part 41, thereby realizing the angle adjustment of the cover.

[0064] As mentioned above, there is more than one locking part 42. To ensure smooth assembly and disassembly, the locking parts 42 on the inner ring plate 31 need to move synchronously. Taking four locking parts 42 as an example, during assembly and disassembly, the protrusions 43 on the outer cover 32 need to cooperate with the four locking parts 42.

[0065] In one embodiment, please refer to Figure 2 and Figure 3 An annular groove 311 is formed on the outer wall of the inner ring plate 31 along the circumferential direction F1, and a mounting hole 312 is formed on the bottom wall of the annular groove 311. The locking part 42 is movably disposed in the mounting hole 312.

[0066] The protrusion 43 on the inner wall of the outer cover 32 is arranged in a ring. In the first position, the protrusion 43 is engaged in the annular groove 311 so that the locking part 42 extends out of the mounting hole 312 and protrudes from the inner wall of the inner ring plate 31. The protruding part of the locking part 42 is engaged and fixed with the mating part 41.

[0067] In this embodiment, the protrusion 43 is arranged circumferentially along F1, and an annular groove 311 is formed on the outer wall of the inner ring plate 31 along F1. The locking part 42 is movably disposed in the mounting hole 312 on the bottom wall of the annular groove 311. When the outer cover 32 moves to the first position, the protrusion 43 is locked in the annular groove 311. The annular protrusion 43 will evenly press the four locking parts 42 on the bottom wall of the annular groove 311, ensuring that each locking part 42 can extend out of the mounting hole 312 synchronously and stably. At the same time, the annular protrusion 43 is a continuous structure around the entire circumference. No matter what angle the outer cover 32 and the inner ring plate 31 are installed at, the protrusion 43 can be directly locked into the annular groove 311, realizing blind assembly and improving assembly efficiency. Furthermore, the contact area of ​​the annular protrusion 43 is a full circumference, the pressure per unit area is smaller, the wear is uniform and slow, and it can maintain stable fitting accuracy and locking effect for a long time.

[0068] In another embodiment, the protrusion is also arranged in a ring shape, but the difference is that the protrusion includes four annular segments spaced apart, each annular segment corresponding to a locking part 42. When the outer cover 32 moves to the first position, the four annular segments will move to the first position accordingly. At this time, the four annular segments will synchronously push the four locking parts 42 of the inner ring body radially inward and lock them in place with the corresponding mating parts 41. When the outer cover 32 moves to the second position, the four annular segments will move to the second position accordingly, thereby misaligning with the corresponding locking parts 42, so that the four locking parts 42 can move radially outward synchronously and disengage from the corresponding mating parts 41.

[0069] In one embodiment, the outer side wall of the mounting platform 2 is provided with a plurality of slots 21 along its circumferential direction F1, and the mating part 41 includes the slots 21. This invention does not impose specific limitations on the form of the locking part 42; the locking part 42 can be configured as a locking post or as a steel ball.

[0070] In one embodiment, please refer to Figure 2 and Figure 3 The locking part 42 includes a steel ball 421, which is radially movably disposed on the inner ring plate 31. In a first position, the protrusion 43 faces the steel ball 421 so that the steel ball 421 is engaged in the corresponding locking groove 21. In a second position, the protrusion 43 is misaligned with the steel ball 421 so that the steel ball 421 can move out of the locking groove 21.

[0071] When the protrusion 43 pushes the steel ball 421 into the slot 21, the contact between the steel ball 421 and the protrusion 43 and the slot 21 is point contact + rolling friction, resulting in less resistance, requiring no extra force during operation, and providing a lighter feel. When the protrusion 43 and the steel ball 421 are misaligned, the steel ball 421 can naturally roll away along the inner wall of the slot 21, thus facilitating the steel ball 421 to disengage from the slot 21.

[0072] Meanwhile, the steel ball 421 has high hardness, resulting in minimal point contact wear with the slot 21, maintaining stable engagement accuracy even after long-term use. Even with slight wear, the spherical structure of the steel ball 421 ensures consistent contact with the slot 21, eliminating the need for frequent part replacements. Furthermore, combined with the aforementioned embodiment of "four locking parts 42," the four orthogonally distributed steel balls 421 simultaneously engage with their corresponding slots 21 from four directions, evenly distributing the load across the circumferential F1 of the mounting platform 2, preventing deformation of the slot 21 due to overload on a single locking part 42.

[0073] Furthermore, the steel ball 421 is small in size and can be directly embedded in the radial mounting hole 312 of the inner ring plate 31, thereby making the assembly structure between the outer cover 32 and the inner ring plate 31 compact and realizing the miniaturized design of the cover.

[0074] When the outer cover 32 switches from the second position to the first position, the protrusion 43, upon contacting the steel ball 421, generates a squeezing force that pushes the steel ball 421 radially inward, causing it to engage with the slot 21. To facilitate smoother pushing of the steel ball 421, please refer to one embodiment. Figure 3 The protrusion 43 forms a transition slope 431 between the end face of the side away from the base 1 and the side surface.

[0075] As mentioned above, during the assembly and disassembly process, the outer cover 32 needs to move relative to the inner ring plate 31 along the axial direction F2 to switch between the first and second positions. To ensure the stability of the movement trajectory of the outer cover 32, in one embodiment, please refer to... Figure 2 The protective cover 3 also includes a guide groove 51 and a guide post 52 that fit together. The guide groove 51 and the guide post 52 are both arranged along the axial direction F2. One of them is located on the outer wall of the inner ring plate 31 and is offset from the card part 42 in the circumferential direction F1. The other is located on the inner wall of the outer cover 32.

[0076] By setting the guide groove 51 and guide post 52, the outer cover 32 can be guided in its axial movement F2, ensuring the stability of its movement trajectory. Simultaneously, the insertion and engagement of the guide groove 51 and guide post 52 can limit the movement of the outer cover 32 and inner ring plate 31 in the circumferential direction F1, preventing relative rotation between them. When the outer cover 32 moves to the second position, the entire cover can be rotated by rotating the outer cover 32, facilitating single-person adjustment of the cover angle.

[0077] Specifically, at least two guide posts 52 are provided, and correspondingly, at least two guide grooves 51 are provided. This ensures that when the structure is subjected to radial force or torque, the forces acting simultaneously are shared, preventing individual guide posts 52 from deforming or breaking due to excessive stress. Furthermore, compared to an asymmetrical design with two guide posts 52, symmetrically arranging the two guide posts 52 radially not only ensures high centering accuracy of the component in the radial direction, preventing swaying or offset due to center of gravity shift, but also reduces local stress concentration and extends the service life of the component.

[0078] More specifically, four guide posts 52 are provided, which are radially symmetrical in pairs, and the axes of symmetry of the two sets of guide posts 52 are orthogonal. Correspondingly, four guide grooves 51 are provided, with each guide groove 51 corresponding to one guide post 52.

[0079] When the structure is subjected to torque and radial impact, the force on the two symmetrical guide posts 52 will be concentrated on a single line of symmetry, which can easily lead to stress overload in that area. The four orthogonal guide posts 52, on the other hand, allow the force to be transmitted synchronously from four directions, reducing the force per unit area and preventing the inner ring plate 31 or the outer cover 32 from deforming or even breaking due to excessive local stress. At the same time, the four orthogonal guide posts 52 can form a cross-shaped locating pin, which not only restricts the relative displacement of the inner ring plate 31 and the outer cover 32 in the radial direction, but also restricts the relative displacement of the inner ring plate 31 and the outer cover 32 in the circumferential direction F1.

[0080] As mentioned above, during the disassembly of the cover, the outer cover 32 needs to be switched between a first position and a second position. To facilitate this position switching of the outer cover 32, in one embodiment, please refer to... Figure 3 The protective cover 3 also includes a first limiting part 33, a second limiting part 34, and a spring 35. The first limiting part 33 is encircled on the outer wall of the inner ring plate 31 and located on the side of the protrusion 43 away from the base 1, and is used to limit the protrusion 43 in the axial direction F2. The second limiting part 34 is encircled on the outer wall of the inner ring plate 31 and is located on the side of the protrusion 43 closer to the base 1; the spring 35 is disposed between the second limiting part 34 and the protrusion 43.

[0081] In this embodiment, the outer wall of the inner ring plate 31 is provided with a first limiting part 33 and a second limiting part 34 spaced side by side along the axial direction F2. The protrusion 43 on the outer cover 32 is placed between the first limiting part 33 and the second limiting part 34, which on the one hand limits the movement of the outer cover 32 along the axial direction F2, and on the other hand prevents the outer cover 32 from separating from the inner ring plate 31.

[0082] Meanwhile, spring 35 is positioned between the second limiting part 34 and the protrusion 43. Pushing the outer cover 32 towards the base 1 causes it to move relative to the inner ring plate 31 to a second position, misaligning the protrusion 43 with the locking part 42. At this point, spring 35 is compressed. When the user removes the force applied to the outer cover 32, spring 35 returns to its original position, thereby pushing the outer cover 32 relative to the inner ring plate 31 back to a first position. This reduces operating steps and improves efficiency.

[0083] Specifically, the first limiting part 33 includes an annular protrusion, which is located on the side of the protrusion 43 away from the base 1. The annular protrusion is circumferentially arranged around the outer wall of the inner ring plate 31 along the circumferential direction F1 and is located at the periphery of the groove opening of the annular groove 311. The side of the annular protrusion facing the base 1 is used to limit the protrusion 43.

[0084] More specifically, the annular protrusion can be configured as a separate component and fixed to the outer wall of the inner ring plate 31. Alternatively, the annular protrusion can be integrally formed with the inner ring plate 31.

[0085] Specifically, an annular clearance groove 313 is formed on the outer wall of the inner ring plate 31 along the circumferential direction F1, and the clearance groove 313 is located near the base 1. The cover 3 also includes a retaining ring 341 and a washer 342. The retaining ring 341 is engaged in the clearance groove 313 and partially protrudes from the opening of the clearance groove 313. The washer 342 is arranged around the outer periphery of the inner ring plate 31, and the washer 342 is located on the protruding part of the retaining ring 341 and on the side of the retaining ring 341 facing the protrusion 43. The second limiting part 34 includes the retaining ring 341 and the washer 342, and the spring 35 is located between the washer 342 and the protrusion 43.

[0086] More specifically, to facilitate the installation of the spring 35, the outer periphery of the washer 342 extends radially beyond the outer periphery of the retaining ring 341 on the side facing the outer cover 32, thereby providing ample installation space for the spring 35. The retaining ring 341 is a C-type retaining ring for easy installation.

[0087] As described above, when the inner ring plate 31 is fitted into place, the locking part 42 on the inner ring plate 31 aligns with the mating part 41 on the mounting platform 2. To prevent over-fitting of the inner ring plate 31, which could lead to misalignment between the locking part 42 on the inner ring plate 31 and the mating part 41 on the mounting platform 2, please refer to one embodiment. Figure 3 A limiting rib 6 is provided at the connection between the base 1 and the mounting platform 2, and when the inner ring plate 31 and the mounting platform 2 are fitted into place, the end face of the inner ring plate 31 abuts against the end face of the limiting rib 6.

[0088] During assembly, the entire cover 3 is first fitted onto the mounting platform 2. The locking part 42 abuts against the edge of the mounting platform 2, pushing the outer cover 32 relative to the inner ring plate 31 to the second position, causing the protrusion 43 to be misaligned with the locking part 42, thus providing clearance for the movement of the locking part 42. At this time, the spring 35 is in a compressed state. Continue to push the outer cover 32 towards the base 1. At this time, under the action of the squeezing force, the locking part 42 can move radially outward, and the mounting platform 2 cannot limit the locking part 42, so that the inner ring plate 31 can smoothly drive the locking part 42 towards the base 1. At this time, the spring 35 is further compressed.

[0089] When the inner ring plate 31 abuts against the limiting rib 6 and is fitted into place, the locking part 42 on the inner ring plate 31 aligns with the mating part 41 on the mounting platform 2. When the user removes the thrust applied to the outer cover 32, the spring 35 returns to its original position, thereby pushing the outer cover 32 relative to the inner ring plate 31 to the first position, so that the protrusion 43 and the locking part 42 are aligned. The protrusion 43 pushes the locking part 42 to move radially inward until it is locked and fixed with the mating part 41, thereby realizing the assembly and fixation of the cover 3 and the base 1.

[0090] Furthermore, during assembly, when the outer cover 32 is pushed relative to the inner ring plate 31 to the second position, the protrusion 43 and the locking part 42 are misaligned, and the spring 35 is in a compressed state. At this time, the entire cover 3 can be rotated circumferentially F1. After the cover 3 is rotated to a predetermined angle, the user removes the thrust applied to the outer cover 32, the spring 35 returns to its original position, thereby pushing the outer cover 32 relative to the inner ring plate 31 to the first position, so that the protrusion 43 and the locking part 42 are aligned. The protrusion 43 pushes the locking part 42 to move radially inward until it is locked and fixed with the mating part 41, thereby realizing the adjustment of the cover angle and the assembly fixation.

[0091] During disassembly, the outer cover 32 is pushed relative to the inner ring plate 31 to the second position, causing the protrusion 43 to misalign with the locking part 42, thus providing clearance for the movement of the locking part 42. At this time, the spring 35 is in a compressed state. Then, the inner ring plate 31 is pulled outwards. Under the action of radial extrusion force, the locking part 42 moves radially outwards until it disengages from the mating part 41. The user can then pull the entire cover 3 away from the mounting platform 2 by pulling out the inner ring plate 31, thereby achieving the disassembly of the cover 3 from the base 1. After the inner ring plate 31 is pulled outwards until the locking part 42 and the mating part 41 are misaligned axially, the user can release the inner ring plate 31, the spring 35 returns to its original position, and thus pushes the outer cover 32 relative to the inner ring plate 31 to its original position. In this way, this solution achieves quick replacement of the cover 3 of the lithium battery angle grinder 100 through the cooperation of the mating part 41, the locking part 42, and the protrusion 43. The structure is simple and the operation is convenient.

[0092] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A lithium-ion battery angle grinder, characterized in that, include: chassis; A base, disposed on the housing, has a mounting platform protruding from its side opposite to the housing; the outer side wall of the mounting platform is provided with a plurality of mating parts along its circumference; and, The protective cover includes an inner ring plate and an outer cover. The inner ring plate is movably fitted around the periphery of the mounting platform. The inner ring plate has a movable locking part arranged radially thereon, and when the inner ring plate is fitted into place, the locking part corresponds to the mating part. The outer cover is fitted around the periphery of the inner ring plate, and its inner wall has a protrusion. The outer cover can move axially relative to the inner ring plate and has a first position and a second position in its movement stroke. In the first position, the protrusion faces the locking part so that the locking part is locked and fixed with the corresponding mating part. In the second position, the protrusion is misaligned with the locking part so that the locking part can move and disengage from the mating part, so that the inner ring plate can rotate circumferentially and move axially relative to the mounting platform.

2. The lithium-ion battery angle grinder according to claim 1, characterized in that, The outer wall of the inner ring plate has an annular groove along the circumference, and the bottom wall of the annular groove has a mounting hole, and the locking part is movably disposed in the mounting hole; The protrusion on the inner wall of the outer cover is arranged in a ring. At the first position, the protrusion is placed in the annular groove so that the locking part extends out of the mounting hole and protrudes from the inner wall of the inner ring plate. The protruding part of the locking part is locked and fixed with the mating part.

3. The lithium-ion battery angle grinder according to claim 1, characterized in that, At least two card parts are provided, and the two card parts are symmetrically arranged in the radial direction of the inner ring plate. The number of mating parts is an integer multiple of the number of card parts.

4. The lithium-ion battery angle grinder according to claim 1, characterized in that, The protective cover also includes a guide groove and a guide post that fit together. The guide groove and the guide post are both arranged axially. One of them is located on the outer wall of the inner ring plate and is offset from the card part in the circumferential direction. The other is located on the inner wall of the outer cover.

5. The lithium-ion battery angle grinder according to claim 1, characterized in that, The protective cover also includes a first limiting part, a second limiting part, and a spring. The first limiting part is circumferentially disposed on the outer wall of the inner ring plate and located on the side of the protrusion away from the base, so as to limit the protrusion in the axial direction. The second limiting part is circumferentially disposed on the outer wall of the inner ring plate and located on the side of the protrusion close to the base. The spring is disposed between the second limiting part and the protrusion.

6. The lithium-ion battery angle grinder according to claim 5, characterized in that, The outer wall of the inner ring plate has an annular clearance groove along the circumferential direction, and the clearance groove is located close to the base; The protective cover also includes a retaining ring and a washer. The retaining ring is engaged in the clearance groove and partially protrudes from the opening of the clearance groove. The washer is arranged around the outer periphery of the inner ring plate. The washer is located on the protruding part of the retaining ring and is located on the side of the retaining ring facing the protrusion. The second limiting part includes the retaining ring and the washer, and the spring is disposed between the washer and the protrusion.

7. The lithium-ion battery angle grinder according to claim 1, characterized in that, A limiting rib is provided at the connection between the base and the mounting platform, and when the inner ring plate is fitted into the mounting platform, the end face of the inner ring plate abuts against the end face of the limiting rib.

8. The lithium-ion battery angle grinder according to any one of claims 2-7, characterized in that, The outer wall of the mounting platform is provided with multiple slots along its circumference. The inner ring plate is provided with movable steel balls or locking posts along its radial direction. In the first position, the protrusion is directly opposite the steel ball or locking post so that the steel ball or locking post can be inserted into the corresponding locking groove. In the second position, the protrusion is misaligned with the steel ball or locking post so that the steel ball or locking post can move out of the locking groove. The mating part includes the slot, and the locking part includes the steel ball or locking post.

9. The lithium-ion battery angle grinder according to any one of claims 2-7, characterized in that, The number of mating parts is set to N, where 4≤N≤32.

10. The lithium-ion battery angle grinder according to any one of claims 2-7, characterized in that, The protrusion forms a transition slope between its side face and the side face away from the base.

Images