A power tool

Abstract

The utility model provides a kind of electric tool, including shell, motor assembly, transmission assembly, tool rest, motor assembly, transmission assembly are set in shell, the input end of transmission assembly is connected motor shaft;Tool rest connects the output end of transmission assembly, and the one end of tool rest is provided with blade and guide assembly;Guide assembly includes sleeve and multiple abutting members, sleeve is sleeved on tool rest, multiple abutting members are peripherally set in sleeve, and adjusting mechanism is set between abutting member and sleeve, and adjusting mechanism drives abutting member to move relative to sleeve.The electric tool of the utility model is provided with the guide assembly of variable diameter, and guide assembly is rotatably set on tool rest by sleeve, and guide assembly is rolled contact with the edge of workpiece by multiple abutting members, adjusting mechanism is set between abutting member and sleeve, so the radial dimension of guide assembly can be adjusted by adjusting mechanism to adapt to different R angle blade.

Description

Technical Field

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

[0002] During the manufacturing process of metal workpieces, numerous burrs are often left at the edges and corners of the workpieces or the edges of holes. Various handheld chamfering machines are commonly used to chamfer and deburr these workpieces, resulting in smoother edges. A chamfering machine has a motor-driven tool holder, on which are mounted chamfering blades and rolling bearings. As the chamfering machine moves along the edge of the workpiece, the rolling bearings roll along that edge, thus improving the chamfering efficiency. To meet different chamfering requirements, rolling bearings of different radial dimensions are often used to match the workpiece. This not only necessitates configuring various sizes of rolling bearings as accessories for the chamfering machine, but also makes the disassembly and assembly of the rolling bearings quite cumbersome. Utility Model Content

[0003] The purpose of this utility model is to provide a power tool, which aims to design a rolling guide structure for a variable diameter power tool to accommodate different R-angle blades.

[0004] To solve the above-mentioned technical problems, the present invention provides an electric tool, comprising:

[0005] case;

[0006] A motor assembly, wherein the motor assembly is disposed within the housing, and the motor assembly has a motor shaft;

[0007] A transmission assembly, which is disposed within the housing, has its input end connected to the motor shaft;

[0008] A tool holder, which is connected to the output end of the transmission assembly, has a blade and a guide assembly at the end of the tool holder away from the transmission assembly, and the guide assembly is located on the side of the blade away from the transmission assembly;

[0009] The guide assembly includes a sleeve and multiple abutment members. The sleeve is fitted onto the tool holder, and the multiple abutment members are arranged around the periphery of the sleeve. An adjustment mechanism is provided between the abutment members and the sleeve, and the adjustment mechanism drives the abutment members to move relative to the sleeve.

[0010] Preferably, the adjustment mechanism includes:

[0011] A movable shaft is disposed on the surface of the abutment member near the sleeve;

[0012] A connecting shaft is disposed on the outer peripheral side of the sleeve;

[0013] The movable shaft and the connecting shaft each have a threaded hole on one end face and an external thread on the circumferential side face of the other, which is threaded to the threaded hole.

[0014] Preferably, the threaded hole is provided on the end face of the moving shaft away from the abutment, and the surface of the abutment away from the sleeve is provided with a screw mounting hole communicating with the threaded hole. A limit screw is provided at the screw mounting hole, and the tail of the limit screw extends into the threaded hole and is threadedly connected to the end face of the connecting shaft away from the sleeve.

[0015] Preferably, the external thread is provided on the circumferential side of the connecting shaft, and the connecting shaft is provided with an adjusting knob that is threadedly connected to the external thread. The adjusting knob is located on the side of the moving shaft away from the abutment, and the adjusting knob drives the moving shaft and the abutment to move relative to the sleeve in the radial direction of the tool holder.

[0016] Preferably, four abutting members are provided, each abutting member is an arc-shaped block, and the surface of the lower-level member away from the sleeve is an arc-shaped surface.

[0017] Preferably, when all the abutting members are located at the first extreme position closest to the sleeve, the multiple abutting members are spliced ​​together along the circumference of the sleeve to form a cylindrical shape.

[0018] Preferably, the blade has a cutting edge portion for operation, the cutting edge portion having a connected straight edge and a curved edge, the curved edge near the guide assembly forming an intersection point with the straight edge; when the plurality of abutments are all located at the second extreme position furthest from the sleeve, the intersection point is located on the side of the guide assembly away from the central axis of the blade holder, and the plurality of abutments are spliced ​​together along the circumference of the sleeve to form a cylindrical shape.

[0019] Preferably, the tool holder is provided with an axial limiting member, which abuts against the side of the sleeve away from the transmission assembly.

[0020] Preferably, the axial limiting member is a retaining ring, and the tool holder is provided with an annular mounting groove, with the axial limiting member disposed at the annular mounting groove.

[0021] Preferably, the tool holder is provided with a shoulder stop surface facing the sleeve, and the shoulder stop surface abuts against the side of the sleeve near the transmission assembly.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The power tool of this utility model is equipped with a variable diameter guide assembly. The guide assembly is rotatably mounted on the tool holder via a sleeve, and the guide assembly makes rolling contact with the edge of the workpiece through multiple abutment members. An adjustment mechanism is provided between the abutment members and the sleeve, so that the radial dimension of the guide assembly can be adjusted to accommodate different R-angle cutting tools. Attached Figure Description

[0024] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0025] Figure 1 This is a cross-sectional view of the power tool after removing the guide assembly in an embodiment of this utility model;

[0026] Figure 2 This is an exploded view of the guide assembly of the power tool in an embodiment of this utility model;

[0027] Figure 3 for Figure 2 Schematic diagram of the structure at the middle tool holder;

[0028] Figure 4 for Figure 3 A schematic diagram of the structure of the guide component;

[0029] Figure 5 for Figure 4 A partial structural diagram of the central guide component;

[0030] Figure 6 for Figure 3 A schematic diagram of the middle tool holder.

[0031] Explanation of reference numerals in the accompanying drawings of this utility model:

[0032] Power tool 100, housing 1, first sleeve 11, second sleeve 12, support surface 13, motor assembly 2, motor shaft 21, transmission assembly 3, tool holder 4, annular mounting groove 41, shoulder stop surface 42, tool holder shaft 43, tool head mounting part 44, end shaft 45, receiving groove 46, blade mounting groove 47, slot 48, blade 5, cutting edge 51, straight edge of cutting edge 511, curved edge of cutting edge 512, intersection point 513, blade tip 52, guide assembly 6, sleeve 61, abutment part 62, adjustment mechanism 63, moving shaft 631, connecting shaft 632, threaded hole 633, screw mounting hole 634, adjustment knob 635, limit screw 64, axial limit part 7.

[0033] 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

[0034] 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.

[0035] 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.

[0036] 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 indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, 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. If 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.

[0037] This utility model provides a power tool, which can be an angle grinder or a chamfering machine, etc. The following description will use a chamfering machine as an example. Figures 1 to 6 A preferred embodiment of the power tool provided by this utility model is shown.

[0038] Please see Figures 1 to 6In this embodiment, the power tool 100 includes a housing 1, a motor assembly 2, a transmission assembly 3, and a tool holder 4. The motor assembly 2 is disposed inside the housing 1 and has a motor shaft 21. The transmission assembly 3 is disposed inside the housing 1, and its input end is connected to the motor shaft 21. The tool holder 4 is connected to the output end of the transmission assembly 3. A blade 5 and a guide assembly 6 are disposed at the end of the tool holder 4 away from the transmission assembly 3. The guide assembly 6 is located on the side of the blade 5 away from the transmission assembly 3. The guide assembly 6 includes a sleeve 61 and a plurality of abutment members 62. The sleeve 61 is rotatably fitted onto the tool holder 4 along the axial direction of the tool holder 4. The plurality of abutment members 62 are disposed around the periphery of the sleeve 61. The surface of each abutment member 62 away from the sleeve 61 is an arc-shaped surface protruding in the direction away from the sleeve 61. An adjustment mechanism 63 is provided between each abutment member 62 and the sleeve 61 so that each abutment member 62 is adjustable relative to the sleeve 61 in a radially movable manner along the tool holder 4.

[0039] Specifically, the blade 5 can be fixed to the tool holder 4 by means of screws or clamps. A transmission component 3 is provided between the tool holder 4 and the motor shaft 21 of the motor assembly 2 to transmit power. Thus, when the motor assembly 2 is running, the motor shaft 21 of the motor assembly 2 rotates, and the motor shaft 21 drives the tool holder 4 to rotate via the transmission component 3, allowing the blade 5 on the tool holder 4 to chamfer the workpiece. The tool holder 4 and the motor shaft 21 can be coaxial or approximately coaxial; the tool holder 4 and the motor shaft 21 can also be perpendicular or approximately perpendicular. Optionally, please refer to... Figure 1 In this embodiment, the tool holder 4 is arranged perpendicularly to the motor shaft 21. The axial direction of the tool holder 4 is defined as vertical, and the end of the tool holder 4 closest to the transmission assembly 3 is the upper end of the tool holder 4, while the end of the tool holder 4 furthest from the transmission assembly 3 is the lower end of the tool holder 4.

[0040] The upper end of the tool holder 4 is located inside the housing 1 and connected to the transmission assembly 3, thus enabling the tool holder 4 to rotate along the vertical axis via the transmission assembly 3. The lower end of the tool holder 4 extends downward outside the housing 1, and the lower end of the tool holder 4 is provided with a cutting blade 5 and a guide assembly 6 located below the cutting blade 5. At least a portion of the cutting blade 5 is located outside the housing 1, allowing the cutting blade 5 to cut into the edge of the workpiece. The guide assembly 6 is able to roll relative to the tool holder 4 along the vertical axis, so that when the cutting blade 5 moves along the edge of the workpiece for chamfering, the guide assembly 6 will contact the edge of the workpiece, and the guide assembly 6 can roll along the edge of the workpiece, thereby improving the chamfering efficiency of the power tool 100.

[0041] The guide assembly 6 includes a sleeve 61 and multiple abutment members 62. The sleeve 61 is typically a cylindrical shape extending vertically. The sleeve 61 is fitted around the lower end of the tool holder 4, and the sleeve 61 and the tool holder 4 are typically clearance-fitted, allowing the sleeve 61 to rotate relative to the tool holder 4 along an upward axis. Thus, the guide assembly 6 is rotatably mounted on the lower end of the tool holder 4 via the sleeve 61. Multiple abutment members 62 are arranged around the sleeve 61 along the rotation direction of the guide assembly 6. The outer surfaces of the multiple abutment members 62 away from the sleeve 61 are all arc-shaped, allowing their outer surfaces to be joined to form a cylindrical surface. This allows the guide assembly 6 to roll into contact with the edges of the workpiece via the arc-shaped outer surfaces of the multiple abutment members 62. Multiple abutment members 62 are connected to the sleeve 61 through multiple adjustment mechanisms 63, so that the multiple abutment members 62 can be adjusted to move radially relative to the sleeve 61 along the tool holder 4. Thus, the radial dimension of the guide assembly 6 can be adjusted by the multiple adjustment mechanisms 63 to accommodate different R-angle blades 5. The radial dimension of the guide assembly 6 is the diameter of the cylindrical surface formed by splicing the outer surfaces of the multiple abutment members 62.

[0042] The power tool 100 of this utility model is provided with a variable diameter guide assembly 6. The guide assembly 6 is rotatably mounted on the tool holder 4 via a sleeve 61. The guide assembly 6 makes rolling contact with the edge of the workpiece via multiple abutment members 62. An adjustment mechanism 63 is provided between the abutment members 62 and the sleeve 61. Thus, the radial dimension of the guide assembly 6 can be adjusted by the adjustment mechanism 63 to accommodate different R-angle blades 5.

[0043] The guide component 6 includes multiple abutment members 62. The specific number of abutment members 62 can be set according to actual needs; for example, there can be two, three, four, five, or more abutment members 62. Optionally, please refer to... Figures 1 to 6 In this embodiment, four abutment members 62 are provided. The outer surfaces of the four abutment members 62 can be spliced ​​together to form a relatively complete cylindrical surface, which is beneficial for the guide assembly 6 to roll along the edge of the workpiece. The following description will take the case of four abutment members 62 as an example.

[0044] The outer surface of the abutment 62 is curved. The specific shape and style of the abutment 62 can be set according to the actual situation. For example, the inner surface of the abutment 62 near the sleeve 61 can be flat or curved. Optionally, please refer to Figures 1 to 6 In this embodiment, the abutment 62 is an arc-shaped block. The abutment 62 is arranged in an arc shape, and this arrangement of the abutment 62 is relatively simple.

[0045] The specific configuration of the adjusting mechanism 63 can be set according to actual conditions. For example, the adjusting mechanism 63 can adopt a threaded connection structure, a gear and rack connection structure, or a snap-fit ​​connection structure. Optionally, please refer to... Figures 1 to 6 In this embodiment, the adjusting mechanism 63 includes a movable shaft 631 and a connecting shaft 632. The movable shaft 631 is disposed on the surface of the abutment 62 near the sleeve 61; the connecting shaft 632 is disposed on the outer peripheral side of the sleeve 61; wherein, a threaded hole 633 is provided on the end face of one of the movable shaft 631 and the connecting shaft 632, and an external thread (not shown in the figure) is provided on the peripheral side of the other for threaded connection with the threaded hole 633.

[0046] Specifically, the moving shaft 631 protrudes from the inner surface of the abutment 62 and extends radially along the tool holder 4. The connecting shaft 632 protrudes from the outer peripheral side of the sleeve 61 corresponding to the moving shaft 631. The connecting shaft 632 extends radially along the tool holder 4, and the connecting shaft 632 and the moving shaft 631 are coaxial or approximately coaxial.

[0047] A threaded connection structure is arranged radially along the tool holder 4 between the moving shaft 631 and the connecting shaft 632. The threaded connection structure includes a threaded hole 633 and an external thread. The threaded hole 633 can be located on the moving shaft 631, while the external thread is located on the connecting shaft 632; alternatively, the threaded hole 633 can be located on the connecting shaft 632, while the external thread is located on the moving shaft 631. The following description uses an example where the threaded hole 633 is located on the end face of the moving shaft 631 near the sleeve 61, while the external thread is located on the circumferential side of the connecting shaft 632. The end of the connecting shaft 632 furthest from the sleeve 61 extends into the threaded hole 633 and is provided with an external thread. Thus, when the operator rotates the abutment 62, the assembly of the moving shaft 631 and the connecting shaft 632 can extend and retract radially along the tool holder 4, thereby allowing the abutment 62 to be adjusted relative to the sleeve 61 in a radially movable configuration along the tool holder 4.

[0048] Further, please refer to Figures 1 to 6 In this embodiment, an external thread is provided on the circumferential side of the connecting shaft 632, and an adjustment knob 635 is provided on the connecting shaft 632 that is threadedly connected to the external thread. The adjustment knob 635 abuts against the side of the moving shaft 631 away from the abutment member 62.

[0049] Specifically, the adjustment knob 635 is located on the connecting shaft 632, and the adjustment knob 635 is located on the side of the moving shaft 631 near the sleeve 61. After the operator rotates the abutment 62 to adjust the radial dimension of the guide assembly 6, the adjustment knob 635 on the connecting shaft 632 is rotated so that the adjustment knob 635 abuts against the side of the moving shaft 631 near the sleeve 61. In this way, the moving shaft 631 can be limited in the radial direction of the tool holder 4 by adjusting the knob 635, thereby locking the abutment 62.

[0050] Optionally, please refer to Figures 1 to 6 In this embodiment, the threaded hole 633 is provided on the end face of the movable shaft 631 away from the abutment member 62. The surface of the abutment member 62 away from the sleeve 61 is provided with a screw mounting hole 634 communicating with the threaded hole 633. A limit screw 64 is provided at the screw mounting hole 634. The tail of the limit screw 64 extends into the threaded hole 633 and is threadedly connected to the end face of the connecting shaft 632 away from the sleeve 61.

[0051] Specifically, the movable shaft 631 is hollow and integral with the abutment member 62. The inner surface of the movable shaft 631 is threaded to form a threaded hole 633. The outer surface of the abutment member 62 has a screw mounting hole 634 communicating with the threaded hole 633. A limiting screw 64 is provided at the screw mounting hole 634, with its tail extending into the threaded hole 633. The limiting screw 64 can either form a threaded engagement with the threaded hole 633 or a clearance engagement with it. The end face of the connecting shaft 632 located within the threaded hole 633 has a threaded structure that can threadedly engage with the limiting screw 64.

[0052] When the operator needs to adjust the radial dimension of the guide assembly 6, first loosen the limit screw 64 to separate the limit screw 64 from the connecting shaft 632. At this time, the operator can rotate the abutment 62 to adjust the radial dimension of the guide assembly 6. After adjusting the radial dimension of the guide assembly 6, tighten the limit screw 64 to re-thread the end of the limit screw 64 and the connecting shaft 632 located in the threaded hole 633. At the same time, rotate the adjustment knob 635 on the connecting shaft 632 so that the adjustment knob 635 abuts against the side of the moving shaft 631 near the sleeve 61. In this way, the moving shaft 631 can be limited in the radial direction of the tool holder 4 by the adjustment knob 635 and the limit screw 64, thereby locking the abutment 62.

[0053] Further, please refer to Figures 1 to 6 In this embodiment, the screw mounting hole 634 is a countersunk hole, and the head of the limiting screw 64 is recessed into the screw mounting hole 634. By making the screw mounting hole 634 a countersunk hole, the situation where the head of the limiting screw 64 protrudes from the outer surface of the abutment member 62 can be avoided.

[0054] Optionally, please refer to Figures 1 to 6 In this embodiment, an axial limiting member 7 is provided on the tool holder 4, and the axial limiting member 7 abuts against the side of the sleeve 61 away from the transmission assembly 3. The axial limiting member 7 abuts against the lower side of the sleeve 61, so that the power tool 100 can limit the guide assembly 6 provided on the tool holder 4 through the axial limiting member 7.

[0055] The specific configuration of the axial limiting component 7 can be set according to the actual situation. For example, the axial limiting component 7 can be a retaining ring, a nut, or a pin. Optionally, please refer to [link to relevant documentation]. Figures 1 to 6 In this embodiment, the axial limiting member 7 is a retaining ring 7, which can be clamped onto the tool holder 4. This method of setting the axial limiting member 7 is relatively simple, and the installation of the axial limiting member 7 is also relatively convenient. The following will describe the axial limiting member 7 as a retaining ring 7 as an example.

[0056] Optionally, please refer to Figures 1 to 6 In this embodiment, the tool holder 4 is provided with an annular mounting groove 41, and the axial limiting member 7 is provided at the annular mounting groove 41.

[0057] Specifically, an annular mounting groove 41 extending circumferentially along the tool holder 4 is provided on the lower end of the peripheral side surface. The retaining spring 7 is clamped in the annular mounting groove 41 of the tool holder 4, and the part of the retaining spring 7 outside the annular mounting groove 41 is used to abut against the sleeve 61. In this way, the retaining spring 7 can be installed and positioned on the tool holder 4 through the annular mounting groove 41.

[0058] Optionally, please refer to Figures 1 to 6 In this embodiment, the tool holder 4 is provided with a shoulder stop surface 42 facing the sleeve 61, and the shoulder stop surface 42 abuts against the side of the sleeve 61 near the transmission assembly 3.

[0059] Specifically, a downward-facing shoulder stop surface 42 is provided on the lower circumferential side of the tool holder 4. The shoulder stop surface 42 is arranged in a ring extending along the circumference of the tool holder 4 and is located on the upper side of the sleeve 61. The shoulder stop surface 42 abuts against the upper side of the sleeve 61. In this way, the guide assembly 6 can be installed and positioned on the tool holder 4 through the shoulder stop surface 42.

[0060] Optionally, please refer to Figures 1 to 6 In this embodiment, when the multiple abutting members 62 are all located at the first limit position closest to the sleeve 61, the multiple abutting members 62 are spliced ​​together along the circumference of the sleeve 61 to form a cylindrical shape.

[0061] Specifically, each abutment 62 is arranged in an arc shape with a central angle of 90°. Thus, when the operator adjusts the radial dimension of the guide assembly 6 to the minimum, the four abutments 62 abut against each other at both ends of the sleeve 61 in the circumferential direction, and the outer surfaces of the four abutments 62 can be spliced ​​together to form a complete cylindrical surface.

[0062] Optionally, please refer to Figures 1 to 6 In this embodiment, the blade 5 has a cutting edge 51 for operation. The cutting edge 51 has a connected straight edge 511 and a curved edge 512. The end of the curved edge 512 near the guide assembly 6 and the straight edge 511 form an intersection point 513. When the multiple abutments 62 are all in the second extreme position furthest from the sleeve 61, the intersection point 513 is located on the side of the guide assembly 6 away from the central axis of the tool holder 4.

[0063] Specifically, the lower end of the tool holder 4 typically has multiple blades 5 arranged circumferentially around the tool holder 4. The portion of the blade 5 protruding laterally from the tool holder 4 forms a cutting edge 51. The edge of the cutting edge 51 away from the center of the blade 5 includes a connected straight cutting edge 511 and a curved cutting edge 512. The lower end of the curved cutting edge 512 and the straight cutting edge 511 form an intersection point 513. The blade 5 cuts the edge of the workpiece through the curved cutting edge 512. When the operator adjusts the radial dimension of the guide assembly 6 to its maximum, the intersection point 513 is located on the side of the guide assembly 6 away from the central axis of the tool holder 4, thus avoiding interference between the guide assembly 6 and the blade 5 cutting the workpiece.

[0064] Optionally, please refer to Figures 1 to 6 In this embodiment, the tool holder 4 includes a tool holder shaft 43, a tool head mounting part 44, and an end shaft 45 connected in sequence. The end of the tool holder shaft 43 away from the tool head mounting part 44 is connected to the output end of the transmission assembly 3. The radial dimension of the tool holder shaft 43 and the radial dimension of the end shaft 45 are both smaller than the radial dimension of the tool head mounting part 44. The guide assembly 6 is disposed on the end shaft 45, and the blade 5 is disposed on the tool head mounting part 44. The tool head mounting part 44 is provided with a receiving groove 46 for accommodating the blade 5. A portion of the blade 5 extends out of the receiving groove 46 to form the cutting edge 51 of the blade 5.

[0065] Specifically, the tool holder 4 includes a tool holder shaft 43, a tool head mounting portion 44, and an end shaft 45 connected sequentially from top to bottom. The tool holder shaft 43 is located inside the housing 1, and its upper end is connected to the transmission assembly 3. The upper end of the tool head mounting portion 44 is located inside the housing 1, while its lower end and the end shaft 45 extend outside the housing 1. The diameter of the tool head mounting portion 44 is larger than the diameter of the tool holder shaft 43 and the diameter of the end shaft 45, and the diameter of the lower end of the tool head mounting portion 44 can gradually decrease from top to bottom. A receiving groove 46 is provided on the peripheral side of the tool head mounting portion 44. A portion of the blade 5 is located inside the receiving groove 46, and the remaining portion of the blade 5 extends laterally outside the receiving groove 46 to form a cutting edge portion 51. This method of housing the blade 5 through the receiving groove 46 helps to avoid interference between the blade 5 and other components.

[0066] Optionally, please refer to Figures 1 to 6 In this embodiment, the bottom wall of the receiving groove 46 is provided with a blade mounting groove 47 that is adapted to the shape of the blade 5, and part of the blade 5 is disposed in the blade mounting groove 47.

[0067] Specifically, a blade mounting groove 47 is provided on the bottom wall of the receiving groove 46. The shape of the blade mounting groove 47 is adapted to the shape of the portion of the blade 5 located within the receiving groove 46, so that the portion of the blade 5 located within the receiving groove 46 can be embedded in the blade mounting groove 47. Thus, by providing a blade mounting groove 47 on the bottom wall of the receiving groove 46, the blade 5 can be installed and positioned within the receiving groove 46. The specific shape of the blade 5 can be set according to the actual situation. For example, the blade 5 can be square or triangular. The following description will take a square blade as an example.

[0068] Optionally, please refer to Figures 1 to 6 In this embodiment, the blade 5 is provided with a tip 52 at the end away from the cutting edge 51, and a slot 48 is provided on the side wall of the blade mounting groove 47, which forms a snap-fit ​​engagement with the tip 52.

[0069] Specifically, the blade 5 has multiple cutting edges 52, and the portion of the blade 5 located within the receiving groove 46 (i.e., the end of the blade 5 furthest from the cutting edge 51) has two cutting edges 52. The sidewall of the blade mounting groove 47 has two retaining grooves 48 corresponding to the two cutting edges 52 within the receiving groove 46. These two retaining grooves 48 connect to the blade mounting groove 47 and penetrate the bottom wall of the receiving groove 46. The two cutting edges 52 engage with the two retaining grooves 48 respectively, thus restricting the rotation of the blade 5 when it is cutting the workpiece.

[0070] Optionally, please refer to Figures 1 to 6In this embodiment, the housing 1 includes a first sleeve 11 and a second sleeve 12. The first sleeve 11 is sleeved on the end of the cutter head mounting part 44 away from the end shaft 45. The second sleeve 12 is sleeved on the first sleeve 11. The end of the second sleeve 12 near the end shaft 45 is provided with a support surface 13. The end of the cutter head mounting part 44 near the end shaft 45 and the end shaft 45 extend out of the second sleeve 12. The second sleeve 12 is adjustable relative to the first sleeve 11 and can move along the axial direction of the cutter holder 4.

[0071] Specifically, both the first sleeve 11 and the second sleeve 12 are cylindrical in shape, extending vertically. The lower end of the first sleeve 11 is fitted over the upper end of the cutter head mounting part 44, and the upper end of the second sleeve 12 is fitted over the lower end of the first sleeve 11. The lower end of the second sleeve 12 is provided with a support surface 13 extending radially along the second sleeve 12. The support surface 13 can provide vertical support and positioning for the workpiece when the blade 5 is cutting it. The upper end of the second sleeve 12 is fitted over the lower end of the first sleeve 11, and a threaded connection structure or a snap-fit ​​connection structure is provided between the second sleeve 12 and the first sleeve 11, allowing the second sleeve 12 to move vertically relative to the first sleeve 11 for adjustment. In this way, the user can control the axial position and chamfer depth of the blade 5 by adjusting the second sleeve 12 vertically.

[0072] 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 inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A power tool, characterized in that, include: case; A motor assembly, wherein the motor assembly is disposed within the housing, and the motor assembly has a motor shaft; A transmission assembly is disposed within the housing, and the input end of the transmission assembly is connected to the motor shaft; A tool holder, which is connected to the output end of the transmission assembly, has a blade and a guide assembly at the end of the tool holder away from the transmission assembly, and the guide assembly is located on the side of the blade away from the transmission assembly; The guide assembly includes a sleeve and multiple abutment members. The sleeve is fitted onto the tool holder, and the multiple abutment members are arranged around the periphery of the sleeve. An adjustment mechanism is provided between the abutment members and the sleeve, and the adjustment mechanism drives the abutment members to move relative to the sleeve.

2. The power tool as described in claim 1, characterized in that, The adjustment mechanism includes: A movable shaft is disposed on the surface of the abutment member near the sleeve; A connecting shaft is disposed on the outer peripheral side of the sleeve; The movable shaft and the connecting shaft each have a threaded hole on one end face and an external thread on the circumferential side face of the other, which is threaded to the threaded hole.

3. The power tool as described in claim 2, characterized in that, The threaded hole is provided on the end face of the moving shaft away from the abutment. The surface of the abutment away from the sleeve is provided with a screw mounting hole that communicates with the threaded hole. A limit screw is provided at the screw mounting hole. The tail of the limit screw extends into the threaded hole and is threadedly connected to the end face of the connecting shaft away from the sleeve.

4. The power tool as described in claim 2, characterized in that, The external thread is provided on the circumferential side of the connecting shaft. An adjustment knob is provided on the connecting shaft and is threadedly connected to the external thread. The adjustment knob is located on the side of the moving shaft away from the abutment. The adjustment knob drives the moving shaft and the abutment to move relative to the sleeve in the radial direction of the tool holder.

5. The power tool as described in claim 1, characterized in that, The abutting member is provided in four parts, and the abutting member is an arc-shaped block, with the surface of the abutting member away from the sleeve being an arc-shaped surface.

6. The power tool as claimed in claim 1, characterized in that, When all the abutting members are located at the first extreme position closest to the sleeve, the abutting members are spliced ​​together along the circumference of the sleeve to form a cylindrical shape.

7. The power tool as described in claim 6, characterized in that, The blade has a cutting edge for operation, the cutting edge having a connected straight edge and a curved edge, the curved edge near the guide assembly forming an intersection with the straight edge; when the plurality of abutments are all located at the second extreme position furthest from the sleeve, the intersection is located on the side of the guide assembly away from the central axis of the blade holder, and the plurality of abutments are spliced ​​together along the circumference of the sleeve to form a cylindrical shape.

8. The power tool as claimed in claim 1, characterized in that, The tool holder is provided with an axial limiting member, which abuts against the side of the sleeve away from the transmission assembly.

9. The power tool as claimed in claim 8, characterized in that, The axial limiting component is a retaining ring, and the tool holder is provided with an annular mounting groove, with the axial limiting component located at the annular mounting groove.

10. The power tool as claimed in claim 1, characterized in that, The tool holder is provided with a shoulder stop surface facing the sleeve, and the shoulder stop surface abuts against the side of the sleeve near the transmission assembly.

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