Shielding and grooving machine

Abstract

The application provides a shield and a slotter. The shield is operable relative to the mounting portion to be converted between a first position and a second position, and the center of the hoop is vertically distant from the plane where the first guard plate is located and the plane where the second guard plate is located by more than 20 mm and less than 26 mm. The slotter comprises a main body, a main handle, an auxiliary handle and a mounting portion, the mounting portion is used for connecting the shield, the slotter blade is defined to be located on the left side of the operator, the auxiliary handle is upward, and the shield is in the first position to be in the tangent mode. The slotter blade is defined to be located on the left side of the operator, the auxiliary handle is downward, and the shield is in the second position to be in the reverse tangent mode. The slotter is operable in the tangent mode or the reverse tangent mode, and the saw blade has the same maximum cutting depth in the tangent mode and the reverse tangent mode.

Description

Technical Field

[0001] The present application belongs to the technical field of electric tools, and particularly relates to a guard and a slotting machine. Background Art

[0002] At present, in the process of building decoration, it is necessary to carry out circuit wiring, water and gas pipeline laying, and network communication line wiring. Wall slotting is generally used to hide wires and pipelines. A wall slotting machine is an electric tool for slotting on a wall, which can be used to open the wire slots required for construction without the assistance of other tools, and has high slotting efficiency.

[0003] Existing slotting machines on the market are divided into a normal cutting mode and a reverse cutting mode (some are called oblique cutting) according to the user's operating habits: the saw blade is on the left side of the operator and the auxiliary handle is on the upper side in the normal cutting mode; the saw blade is on the left side of the operator and the auxiliary handle is on the lower side in the reverse cutting mode. The guards adapted to the slotting machines on the market can only meet one of the normal cutting or reverse cutting modes, and there is no guard that can meet both the normal cutting and reverse cutting modes at the same time. Such a guard often cannot rotate freely after being installed, can only be fixed on the head of the slotting machine, and can only meet the cutting habit of one type of user. For another type of guard, in order to ensure the cutting depth, its rotation angle is limited, so it will interfere with the machine body when rotated to a certain angle. If a larger guard is forcibly installed to realize the rotation of the guard angle for normal and reverse cutting, its cutting depth will be affected, and the maximum cutting depth cannot be achieved with a small-specification saw blade.

[0004] Refer Figure 15 to a slotting machine suitable for reverse cutting as shown, the guard is in the first position, and the saw blade of the slotting machine has a maximum cutting depth R2' at this time. Refer Figure 16 to the illustration, even if the guard is set to be movable, due to the influence of the main body machine body and the guard structure, when the guard is moved to the second position for normal cutting, affected by the structure of the head shell, the maximum cutting depth R1' of the saw blade exposed outside the guard will be smaller than the maximum cutting depth R2' of the saw blade in the reverse cutting mode, thus the maximum cutting depth of the saw blade is affected.

[0005] The proportion of slotting users using normal cutting and reverse cutting is about 50% each, and the guards provided by manufacturers on the market cannot meet both normal and reverse cutting at the same time, which means that about 50% of users need to purchase another type of guard suitable for their own operating habits.

[0006] This section provides background information related to the present application, which is not necessarily prior art. Contents of the Utility Model

[0007] In view of this, the purpose of the present application is to provide a guard that can meet the needs of different users for the normal cutting and reverse cutting modes, and can achieve a large cutting depth in both modes, and a slotting machine equipped with the guard to achieve the same maximum cutting depth.

[0008] To achieve the above objectives, this application provides a protective cover that can be installed on the mounting part of a grooving machine, comprising: a protective part, wherein the protective part is provided with a hoop that mates with the mounting part, the protective part further comprising a protective surface, wherein the protective surface is provided with a protective base plate that is close to the hoop and transverse to the protective surface, the protective base plate comprising a first protective base plate and a second protective base plate, the protective cover being operably switchable between a first position and a second position relative to the mounting part, and the vertical distance between the center of the hoop and the planes where the first protective base plate and the second protective base plate are located is greater than 20 mm and less than 26 mm.

[0009] As a further improvement of one embodiment of this application, the protective base plate further includes an abrasion-resistant plate, and there is a gap between the first protective base plate and the second protective base plate. The abrasion-resistant plate abuts against the first protective base plate and the second protective base plate to seal the gap.

[0010] As a further improvement of one embodiment of this application, the abrasion plate has a first end and a second end opposite to the first end. When the protective cover is in the first position, the first end abuts against the first protective base plate, and the second end abuts against the second protective base plate; when the protective cover is in the second position, the first end abuts against the second protective base plate, and the second end abuts against the first protective base plate.

[0011] As a further improvement of an embodiment of this application, the protective surface has an arc-shaped outer contour, and a plane passing through the center line of the hoop and the center of the outer contour is defined as the central plane of the protective surface, and the first protective base plate and the second protective base plate are symmetrically arranged along the central plane.

[0012] As a further improvement of one embodiment of this application, the protective cover has a protective edge located on one side of the protective part, and the hoop fits seamlessly with at least one side of the protective edge or the abrasion plate.

[0013] This application also provides a protective cover that can be installed on the mounting part of a grooving machine, comprising: a protective part, the protective part including a protective surface, the protective surface having a first protective base plate and a second protective base plate transverse to the protective surface; the protective cover further including an anti-wear plate, the anti-wear plate for abutting against the first protective base plate and the second protective base plate, the anti-wear plate having a first end and a second end opposite to the first end; a notch is formed between the first protective base plate and the second protective base plate, the anti-wear plate for sealing the notch; the protective cover is operably switchable between a first position and a second position relative to the mounting part, in the first position, the first end abutting against the first protective base plate, and the second end abutting against the second protective base plate; in the second position, the first end abutting against the second protective base plate, and the second end abutting against the first protective base plate.

[0014] As a further improvement of an embodiment of this application, the protective part is provided with a hoop that mates with the mounting part, the protective surface has an arc-shaped outer contour, and a plane passing through the center line of the hoop and the center of the outer contour is defined as the central plane of the protective surface, and the first protective base plate and the second protective base plate are symmetrically arranged along the central plane.

[0015] As a further improvement of one embodiment of this application, the protective part is provided with a hoop that mates with the mounting part, and the cover has a protective edge located on one side of the protective part, and the hoop fits into at least one side of the protective edge without gap.

[0016] This application also provides a grooving machine, including a main body; a main handle and an auxiliary handle disposed on the main body; a mounting portion disposed on the main body for connecting a protective cover; the main body includes a motor and an output shaft driven by the motor, the output shaft for mounting a saw blade, the saw blade being rotatable about the axis of the output shaft, and the protective cover covering at least a portion of the saw blade; the grooving machine includes the protective cover as described above, defining a forward cutting mode with the grooving machine saw blade located to the left of the operator, the auxiliary handle facing upward, and the protective cover in a first position; defining a reverse cutting mode with the grooving machine saw blade located to the left of the operator, the auxiliary handle facing downward, and the protective cover in a second position; the grooving machine is operably in either forward cutting mode or reverse cutting mode, and the saw blade has the same maximum cutting depth in both forward cutting mode and reverse cutting mode.

[0017] As a further improvement of one embodiment of this application, the ratio of the maximum cutting depth to the saw blade radius is not less than 73.8%.

[0018] As a further improvement of one embodiment of this application, the protective cover has a protective part and protective edges located on one side of the protective part, with at least a portion of the saw blade exposed from the protective edge of the protective part; the protective part is provided with a hoop that mates with the mounting part, and the hoop fits seamlessly with at least one side of the protective edge.

[0019] As a further improvement of one embodiment of this application, the protective part includes an arc-shaped protective surface, and a pair of protective base plates perpendicular to the protective surface are provided on the protective surface, the protective base plates being symmetrically arranged along the central plane of the protective surface.

[0020] As a further improvement of one embodiment of this application, the main body includes a main shell and a head shell. A transmission mechanism is provided inside the head shell. The transmission mechanism includes a transmission shaft arranged parallel to the output shaft. The head shell includes a front shell portion arranged around the output shaft and a rear shell portion arranged around the transmission shaft. The mounting portion is arranged around the output shaft. The protective cover is installed after the mounting portion. The outer surface of the hoop is flush with the outer surface of the front shell portion.

[0021] As a further improvement of one embodiment of this application, the transmission mechanism is a two-stage gear transmission mechanism, including a large gear and a first transmission gear disposed on the transmission shaft, a second transmission gear disposed on the output shaft and meshing and rotating with the first transmission gear, and a small gear disposed on the motor shaft and meshing with the large gear.

[0022] As a further improvement of one embodiment of this application, the diameter of the mounting part is not greater than 43mm and not less than 40cm.

[0023] As a further improvement of an embodiment of this application, the front shell portion and the rear shell portion are semi-circular, and an inner recess is formed at the connection position of the front shell portion and the rear shell portion, and the inner recess is provided with a screw hole.

[0024] As a further improvement of one embodiment of this application, the motor has a motor axis, and a single screw hole is provided at the foremost end of the front housing, the single screw hole being located on the motor axis.

[0025] As a further improvement of one embodiment of this application, the connection between the single screw hole and the screw holes of the two recesses forms an equilateral triangle.

[0026] As a further improvement of one embodiment of this application, the motor has a motor axis, and the front end of the front housing is provided with two screw holes, which are arranged symmetrically with respect to the motor axis.

[0027] As a further improvement of one embodiment of this application, the connection between the two screw holes and the screw holes of the two recesses forms a quadrilateral.

[0028] As a further improvement of one embodiment of this application, the rear shell portion is provided with two screw holes, and the center line connecting the two screw holes of the rear shell portion and the two screw holes of the recessed portion forms a regular quadrilateral.

[0029] As a further improvement of one embodiment of this application, the main handle and the auxiliary handle are disposed on the same side of the main body, the main handle is configured as a D-shaped handle, and the auxiliary handle is configured as a straight handle.

[0030] As a further improvement of one embodiment of this application, the main body is provided with a motor housing for housing the motor and a handle housing for connecting the main handle. The handle housing is provided with an air inlet area, which includes a plurality of air inlets. Each air inlet is provided with a guide portion extending obliquely towards the motor housing to guide gas from the air inlet into the motor housing. The angle of the guide portion is not less than 30 degrees and not more than 45 degrees. Preferably, the angle range is 35 degrees to 39 degrees.

[0031] As a further improvement of one embodiment of this application, the main body is provided with a head shell located at the front of the motor housing. The head shell is provided with an air outlet area, which includes a plurality of air outlets, at least some of which are symmetrically arranged along the center line of the front end face of the head shell. Preferably, all air outlets are symmetrically distributed along the center line of the front end face of the head shell.

[0032] This application also provides a grooving machine, including the protective cover as described above.

[0033] The transmission mechanism, grooving machine head shell structure, and fastener setting method provided in this application minimize the size of the head shell. Combined with the improved protective cover structure, this allows a small saw blade to achieve a large cutting depth.

[0034] The design of the air inlet zone, air outlet zone, and cooling air duct provided in this application, while ensuring that the heat-generating components inside the grooving machine are adequately cooled, can further reduce the entry of mud and water into the machine body, thereby extending the life of components such as the machine's circuit board, motor, and bearings. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the grooving machine in one embodiment of this application from the front view direction;

[0036] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the grooving machine along the AA direction;

[0037] Figure 3 for Figure 1 A three-dimensional schematic diagram of the head shell of a grooving machine;

[0038] Figure 4 for Figure 1Exploded perspective view of the head shell of the grooving machine;

[0039] Figure 5 This is a schematic diagram of the grooving machine cover structure in one embodiment;

[0040] Figure 6 for Figure 5 A three-dimensional schematic diagram of the inner protective shield from one perspective;

[0041] Figure 7 for Figure 5 A three-dimensional schematic diagram of the inner protective shield from another perspective;

[0042] Figure 8 This is a schematic diagram of the tangential state of a grooving machine according to an embodiment of this application;

[0043] Figure 9 for Figure 8 A partial schematic diagram from the rear view of the grooving machine;

[0044] Figure 10 This is a schematic diagram of the grooving machine in reverse cutting state in one embodiment of this application;

[0045] Figure 11 for Figure 10 A partial schematic diagram from the rear view of the grooving machine;

[0046] Figure 12 for Figure 2 A magnified view of a portion marked V;

[0047] Figure 13 This is a schematic cross-sectional view of the grooving machine head shell structure in one embodiment of this application;

[0048] Figure 14 for Figure 13 A cross-sectional view of the structure along the BB direction;

[0049] Figure 15 The existing grooving machine is in reverse cutting mode;

[0050] Figure 16 The grooving machine in the existing technology is in tangential mode;

[0051] Figure 17 This is an exploded perspective view of the grooving machine head housing according to another embodiment of this application;

[0052] Figure 18 This is a schematic diagram of the grooving machine cover structure in another embodiment;

[0053] Figure 19 for Figure 18 A three-dimensional schematic diagram of the inner protective shield from one perspective;

[0054] Figure 20 for Figure 18 A three-dimensional schematic diagram of the inner protective shield from another perspective;

[0055] Figure 21 for Figure 18 Another perspective of the 3D schematic diagram of the central protective shield;

[0056] Figure 22 This is a schematic diagram of the tangential state of a grooving machine according to an embodiment of this application;

[0057] Figure 23 for Figure 22 A partial schematic diagram from the rear view of the grooving machine;

[0058] Figure 24 This is a schematic diagram of the grooving machine in reverse cutting state in another embodiment of this application;

[0059] Figure 25 for Figure 24 A partial schematic diagram from the rear view of the grooving machine;

[0060] Figure 26 This is a cross-sectional schematic diagram of the grooving machine head shell structure in another embodiment of this application;

[0061] Figure 27 A perspective view of the protective cover in the first position according to this application;

[0062] Figure 28 This is an exploded view of the protective cover after the abrasion plate has been removed in this application;

[0063] Figure 29 This is a perspective view of the protective cover in the second position according to this application;

[0064] Figure 30 This is an exploded view of the other protective cover after the abrasion plate has been removed in this application.

[0065] Figure label:

[0066] 1-Main body; 10, 210-Slotting machine; 11, 211-Housing shell; 108-Main housing; 108a-Motor housing; 108b-Handle housing; 110, 2110-Head housing; 110a, 2110a-Front housing; 110b, 2110b-Rear housing; 112, 2112-Box body; 114, 2114-Cover body; 115, 2115, 3116, 4116-Screw holes; 116, 2116 - Screws; 117 - Connecting hole; 118, 2118 - Air inlet; 119, 2119 - Air outlet; 119a - Upper air outlet; 119b - Middle air outlet; 119c - Lower air outlet; 12, 212 - Main handle; 13, 213 - Auxiliary handle; 14 - Motor shaft; 15 - Pinion; 16 - Large gear; 17, 217 - Mounting part; 18, 218 - Recessed part ; 20, 220 - Drive shaft; 22 - First drive gear; 30, 230 - Output shaft; 32 - Second drive gear; 36 - Controller; 38 - Support bearing; 40 - Air inlet area; 40a - Air inlet; 41 - Air guide plate; 42 - Air outlet area; 5 - Motor; 50, 250 - Protective cover; 50a, 250a - Protective part; 501, 2501 - Protective surface; 50b, 250b - Protective edge; 51 251 - Semi-circular notch; 52, 252 - Hoop; 55, 255 - Saw blade; 60, 260 - Protective base plate; 601, 2601 - First protective base plate; 602, 2602 - Second protective base plate; 61, 261 - Abrasion-resistant plate; 611, 2611 - First end; 612, 2612 - Second end; 62, 262 - Water barrier; 64, 264 - Water barrier plate; 65, 265 - Notch. Detailed Implementation

[0067] The present application will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present application, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of this application.

[0068] Reference Figure 1 , Figure 2 As shown, this application relates to a grooving machine 10, having a main body 1 extending along a longitudinal axis X, and accessories connected to the main body 1. The main body 1 includes a housing 11, a motor 5 housed within the housing, an output shaft 30 driven by the motor 5, a main handle 12 for operation and gripping, and an auxiliary handle 13 disposed in the housing 11; the output shaft 30 is used to mount a saw blade 55, which is rotatable about the axis Y1 of the output shaft 30; the main handle 12 and the auxiliary handle 13 are located on the same side of the main body 1; when the grooving machine 10 is in operation, the main handle 12 is close to the operator's body, while the auxiliary handle 13 is away from the operator's body relative to the main handle 12.

[0069] The housing 11 includes a main housing 108 and a head shell 110 located at the front of the main housing 108; wherein the main housing 108 includes a motor housing 108a housing the motor 5 and a handle housing 108b for connecting the main handle 12. In this embodiment, the handle housing 108b and the motor housing 108a are coaxially arranged, wherein the main housing 108 is made of plastic, and the head shell 110 is made of metal, such as aluminum. The main handle 12 is D-shaped and has a grip portion extending longitudinally along the main housing 108; the auxiliary handle 13 is a straight handle and is detachably connected to the head shell 110. The grip housing 108b is provided with an air inlet area 40, and the head shell is provided with an air outlet area 42.

[0070] The main body 1 is also provided with a mounting part 17, wherein the accessories include a protective cover 50 detachably fitted to the mounting part 17, a water baffle 62 connected to the protective cover 50, and a water baffle plate 64 provided on the water baffle 62. The protective cover 50 can rotate relative to the mounting part 17 to cover at least part of the saw blade 55; the water baffle 62 is movably connected to the lower end of the protective cover 50, and the mounting part 17 is arranged around the output shaft 30.

[0071] A transmission mechanism is provided between the motor 5 and the output shaft 30. This transmission mechanism is a two-stage gear transmission mechanism, including a transmission shaft 20 parallel to the output shaft 30, a large gear 16 and a first transmission gear 22 disposed on the transmission shaft 20, a second transmission gear 32 disposed on the output shaft 30 and meshing with the first transmission gear 22, and a small gear 15 disposed on the motor shaft 5 and meshing with the large gear 16. The rotation of the motor 5 drives the large gear 16 to rotate around the axis of the transmission shaft 20. The large gear 16 and the first transmission gear 22 are coaxially arranged. The rotational power of the motor 5 is transmitted to the output shaft 30 through the first and second transmission gears 22 and 32. The gear transmission mechanism is housed within the head housing 110. Because the grooving machine 10 uses a two-stage gear transmission mechanism, the diameter of the gear at the output end is reduced, resulting in a smaller bearing diameter and a smaller diameter of the mounting part 17. When the protective cover 50 is fitted onto the mounting part 17, the cutting depth is maximized.

[0072] Reference Figure 3 As shown, the mating end of the head shell 110 adjacent to the main shell 108 is provided with a plurality of screw holes 115, and the screw holes 115 have internal threads; the head shell 110 is fastened to the main shell 108 by screws (not shown in the figure) engaging with the screw holes 115. In this embodiment, the head shell 110 is provided with four screw holes 115 and is symmetrically distributed on the left and right, so that the mating position of the head shell 110 and the main shell 108 can be changed, that is, the four screw holes 115 of the head shell 110 and the four screw holes (not shown in the figure) on the main shell 108 can be interchanged, so that the head shell 110 can be rotated 180 degrees relative to the main shell 108 for mating, so that the grooving machine 10 can be in tangential mode (see figure). Figure 7) and reverse shearing mode (see Figure 9 The head shell 110 is provided with a connecting hole 117 on its side. The connecting hole 117 is provided with an internal thread. The auxiliary handle 113 engages with the internal thread through the external thread of its connecting part, thereby locking it to the head shell 110.

[0073] Reference Figure 4 As shown, in one embodiment, the head shell 110 includes a housing 112 and a cover 114. The housing 112 includes a front shell portion 110a surrounding the output shaft 30 and a rear shell portion 110b surrounding the drive shaft 20. The housing 112 and the cover 114 are respectively provided with a plurality of screw holes 115, each containing a screw with an internal thread. Screws 116 pass through the corresponding screw holes 115 on the housing 112 and the cover 114, thereby fastening the housing 112 and the cover 114 together. The front shell portion 110a and the rear shell portion 110b have approximately semi-circular outlines. At the connection point between them near the mounting portion 17, recesses 18 are formed, each containing a screw hole 115. The frontmost end of the front shell portion 110a has a single screw hole 115, and the line connecting the center of the single screw hole 115 and the center of the screw hole 115 in the recess approximately forms an equilateral triangle. The rear shell 110b has two screw holes 115. The center line connecting the two screw holes 115 of the rear shell 110b and the two screw holes 115 of the recessed portion 18 forms a regular quadrilateral, i.e., a square or a rectangle.

[0074] The shape of the front shell 110a and rear shell 110b, as well as the design of the screw hole 115 in the recessed portion 18, fully utilizes the characteristics of the gear transmission mechanism. This ensures the tightness of the cover 114 and the housing 112 while minimizing the size of the front shell 110a. When the grooving machine 10 switches between forward and reverse cutting modes, the front shell 110a will not interfere with the protective cover 50 due to positional changes, thus the maximum cutting depth of the saw blade will not be affected. The fasteners in this application are not limited to the screw hole 115 and the screw 116 that engages with the screw hole 115 in only one embodiment. They can also be replaced with other fastening components or materials, such as welding materials or adhesive materials, to fasten other covers 114 and housings 112, thereby facilitating a miniaturized head shell design.

[0075] Reference Figures 5 to 7As shown, the protective cover 50 has a protective portion 50a and protective edges 50b located on one side of the protective portion 50a. At least a portion of the saw blade 55 is exposed from the protective edges 50b of the protective portion 50a. The protective portion 50a includes a pair of opposing arc-shaped protective surfaces 501. A hoop 52 is provided at the center of one protective surface 501, and a semi-circular notch 51 is provided on the other protective surface 501 corresponding to the position of the hoop 52. The hoop 52 is used to mate with the mounting portion 17 to position the protective cover 50 relative to the head shell 110. The hoop 52 fits seamlessly with at least one protective edge 50b. Due to installation and manufacturing tolerances, a gap of less than 1 mm between the hoop 52 and the protective edge 50b indicates a seamless fit. The protective surface 501 of the hoop 52 is provided with a pair of protective base plates 60 perpendicular to the protective surface 501. The protective base plates 60 are in contact with the protective edge 50b and are symmetrically distributed along the center plane Z of the protective surface 501, that is, the distance L1 from the two protective base plates 60 to the center of the hoop 52 is equal. One of the protective base plates 60 is also provided with an anti-wear plate 61 on its outer side to prevent the screw holes 115 at the front end of the front shell 110 from directly contacting the cutting object W and causing wear. The protective base plate 60 is used to block dust from flying and affecting the operator's vision during cutting. The water shield 62 is movably connected to the protective cover 50, and the water shield 64 is connected to the water shield 62 by fasteners. When the grooving machine 10 is operating, a large amount of dust is generated. Therefore, a water injection device is added to the protective cover. The water baffle 62 and water baffle 64 are mainly used to prevent the mixture of dust and water generated by cutting from splashing directly at the operator. Instead, the water baffle 62 is allowed to flow to the water baffle 64 and then be guided to the ground by the water baffle 64.

[0076] The mounting portion 17 is arranged around the output shaft 30. The protective cover 50 is fitted to the mounting portion 17 via its clamp 52. The diameter of the clamp 52 is minimized while ensuring structural lifespan, thus maximizing the cutting depth. In one embodiment, the diameter of the mounting portion 17 is not greater than 43 mm and not less than 40 mm. The mounting portion 17 is located on the outer edge of the support bearing 38, which supports the output shaft 30. The radial dimension of the mounting portion 17 is designed to meet the strength requirements of the support bearing 38 while maximizing the saw blade cutting depth after the clamp 52 is mounted on it. The inner diameter of the clamp 52 matches the outer diameter of the mounting portion 17, and the outer surface of the mounting portion 17 does not extend beyond the outer surface of the front housing portion 110a. When the clamp 52 of the protective cover 50 is fitted to the mounting portion 17, the outer side of the clamp 52 is approximately flush with the outer surface of the front housing portion 110a (except for the part at the very front of the front housing portion 110a where a single screw hole 115 is provided). Preferably, the outer side of the hoop 52, the outer surface of the front shell 110a, and the inner surface of the wear plate 61 are roughly flush. Due to manufacturing tolerances, a distance of less than 1 mm is considered roughly flush. Since the outer side of the hoop 52 and the outer surface of the front shell 110a are roughly flush, and the inner surface of the wear plate 61 is close to the outer side of the hoop 52 and the outer surface of the front shell 110a, the installation gap between the parts is small, thus maximizing the cutting depth.

[0077] Reference Figure 8 When the grooving machine 10 is in the tangential mode, the saw blade 55 contacts the object to be cut W to perform cutting. At this time, the saw blade 55 is located on the left side of the operator, the auxiliary handle 13 is facing upward, the main handle 12 is located above the housing 11, and the protective cover 50 is in the first position relative to the head shell 110.

[0078] Reference Figure 9 As shown, in the orthographic mode, the maximum cutting depth R1 that the saw blade 55 can achieve is determined by the portion of the saw blade 55 exposed outside the protective edge 50b of the protective part 50a. The maximum cutting depth R1 shown in the figure is the distance between the edge of the protective base plate 60 and the tangent line of the outer edge of the saw blade 55.

[0079] A deep cut is essential for grooving users. Saw blades wear down during use, so users want the machine to have a cutting depth of at least 55mm before the diamond coating on the cutting edge wears off completely. This maximizes blade utilization. In most cases, the deepest required depth is for embedding the junction box during installation. Insufficient embedding depth will affect the subsequent installation of switch panels. Common junction box depths are generally 45mm, so the grooving depth should be between 45mm and 55mm (a deeper depth improves subsequent grooving efficiency). A 72mm cutting depth ensures that 57mm of cutting depth remains even after the diamond coating on the saw blade wears off (the diamond coating is typically 15mm).

[0080] When the saw blade diameter is 195mm, the maximum cutting depth R1 reaches 72mm; the ratio of the maximum cutting depth R1 to the saw blade radius reaches 73.8%, that is, the saw blade utilization rate reaches 73.8%.

[0081] In one embodiment, when the diameter of the saw blade 55 is increased by 10mm, that is, when the diameter of the saw blade is 205mm, and a guard corresponding to the diameter of the saw blade is used, the maximum cutting depth R1 reaches 77mm, and the ratio of the maximum cutting depth R1 to the radius of the saw blade reaches 75.12%.

[0082] Reference Figure 10 , Figure 11 As shown, in reverse cutting mode, the saw blade 55 is located on the operator's left, the auxiliary handle 13 faces downwards, the main handle 12 is located below the housing 11, and the guard 50 is in the second position relative to the head shell 110. At this time, the maximum cutting depth R2 of the saw blade 55 is equivalent to the maximum cutting depth R1 in forward cutting mode. When the diameter of the saw blade 55 is 195mm, the maximum cutting depth R2 is 72mm; the ratio of the maximum cutting depth R2 to the saw blade radius reaches 73.8%.

[0083] In one embodiment, when the diameter of the saw blade 55 is increased by 10mm, that is, when the diameter of the saw blade is 205mm, and a guard corresponding to the diameter of the saw blade is used, the maximum cutting depth R1 reaches 77mm, and the ratio of the maximum cutting depth R1 to the radius of the saw blade reaches 75.12%.

[0084] Table 1 lists several grooving machines, their modes, saw blade sizes, and cutting depths.

[0085]

[0086] The above samples could only achieve a large cutting depth in one mode, and the saw blade utilization rate was less than 72%. The same guard could not be installed simultaneously on the same grooving machine to achieve a high saw blade utilization rate. The grooving machine 10 of this application, regardless of whether it is in forward or reverse cutting mode, has a consistent maximum cutting depth achievable by its saw blade 55, and the saw blade utilization rate is at least 73.8%. The forward and reverse cutting modes are provided to accommodate the actual operating habits of different users, thus offering them a choice suitable for their operating preferences.

[0087] Due to the special working environment of grooving machines, water needs to be continuously added during cutting. Most of the time, the machine head is on top, and the air inlet is on the bottom. Water will flow down the machine body to the air inlet. Currently, the air inlets of machines on the market are not specially designed, and water during operation will be sucked into the machine (there is negative pressure at the machine's air inlet), causing motor or circuit board failure.

[0088] Reference Figure 12As shown, the air inlet zone 40 includes several air inlets 40a, each of which is provided with a guide section 41 inclined towards the motor housing 108a. This guide section directs the cooling gas entering the handle housing 108b from the air inlet 40a to the motor housing 108a after passing through the controller 36, thereby cooling the motor 50. The inclination angle α of the guide section 41 is not less than 30 degrees and not more than 45 degrees. Preferably, the inclination angle ranges from 35 degrees to 39 degrees. In one embodiment, the inclination angle α is set to 39 degrees. The inclination angle α of the guide section 41 not only facilitates the entry and guidance of cooling gas from the air inlets 40a, but also greatly reduces the probability of water or mud flowing down during machine operation being sucked in when passing through the air inlets 40a.

[0089] Reference Figure 13 As shown, the airflow introduced into the motor housing 108a by the air guide section 41 enters the interior of the head housing 110 through the air inlet 118. The two airflows, as indicated by the arrows, flow through both sides of the transmission mechanism and are discharged from the air outlet 119 on the front end face of the head housing 110, thus fully cooling the gear transmission mechanism inside the head housing.

[0090] Reference Figure 14 As shown, the front end face of the head shell 110 has several air vents 119, including an upper air vent 119a, a middle air vent 119b, and a lower air vent 119c. At least some of the air vents 119b and 119c are symmetrically distributed along the head shell centerline Y2. The upper air vent 119a includes two air vents of different widths distributed along the head shell centerline Y2 in the upward and downward directions, and both air vents of different widths pass through the head shell centerline Y2. The middle air vent 119b includes a left air vent and a right air vent, and the number and shape of the left and right air vents correspond. The lower air outlet 119c includes an air outlet located to the left of the head shell centerline Y2 and an air outlet located to the right of the head shell centerline Y2, with the number and shape of the left and right air outlets corresponding. Furthermore, the shape of the lower air outlet 119c is matched to the shape of the head shell 110, making full use of the space on the end face of the head shell. This arrangement not only increases the airflow but also ensures that the airflow entering the head shell 110 is evenly distributed on both sides of the transmission mechanism, resulting in smoother airflow and a significant cooling effect.

[0091] Reference Figure 17As shown, in some embodiments, the head shell 2110 includes a housing 2112 and a cover 2114. The housing 2112 includes a front housing portion 2110a surrounding the output shaft 230 and a rear housing portion 2110b surrounding the drive shaft 220. The housing 2112 and the cover 2114 are respectively provided with a plurality of screw holes 2115, each containing a screw with an internal thread. Screws 2116 pass through the corresponding screw holes 2115 on the housing 2112 and the cover 2114, thereby fastening the housing 2112 and the cover 2114 together. The front housing portion 2110a and the rear housing portion 2110b have approximately semi-circular outlines, and a recessed portion 218 is formed at the connection point near the mounting portion 217, with screw holes 2115 provided in the recessed portion 218. The front end of the front shell 2110a has two screw holes 2115, and the line connecting the center of the two screw holes 2115 and the center of the screw hole 2115 in the recessed portion roughly forms a quadrilateral. The rear shell 2110b has two corresponding screw holes 2115, and the line connecting the center of the two screw holes 2115 in the rear shell 2110b and the center of the two screw holes 2115 in the recessed portion 218 forms a regular quadrilateral, i.e., a square or rectangle.

[0092] Reference Figures 18 to 21As shown, the protective cover 250 has a protective portion 250a and protective edges 250b located on one side of the protective portion 250a. At least a portion of the saw blade 255 is exposed from the protective edges 250b of the protective portion 250a. The protective portion 250a includes a pair of opposing arc-shaped protective surfaces 2501. A hoop 252 is provided at the center of one protective surface 2501, and a semi-circular notch 251 is provided on the other protective surface 2501 corresponding to the position of the hoop 252. The hoop 252 is used to mate with the mounting portion 217 to position the protective cover 250 relative to the head shell 2110. The hoop 252 fits seamlessly with at least one protective edge 250b. Due to installation and manufacturing tolerances, a gap of less than 1 mm between the hoop 252 and the protective edge 250b indicates a seamless fit. The protective surface 2501 of the hoop 252 is provided with a pair of protective base plates 260 perpendicular to the protective surface 2501. The protective base plates 260 are in contact with the guard edge 250b. The protective base plates 260 are symmetrically distributed along the center plane Z of the protective surface 2501, that is, the distance L2 from the two protective base plates 260 to the center of the hoop 252 is equal. An anti-wear plate 261 is also provided on the outer side of one of the protective base plates 260 to prevent the screw holes 2115 at the front end of the front shell 2110 from directly contacting the cutting object W and causing wear. The anti-wear plate 261 also prevents water and dust generated during cutting from splashing onto the tool. The hoop 252 and the anti-wear plate 261 are fitted without gaps. Due to installation and manufacturing tolerances, a gap of less than 1 mm between the hoop 252 and the anti-wear plate 261 is considered a gapless fit. The protective base plate 260 is used to block dust from splashing and affecting the operator's vision during cutting. The water shield 262 is movably connected to the protective cover 250, and the water baffle 264 is connected to the water shield 262 by fasteners.

[0093] Reference Figure 22 When the grooving machine 210 is in the tangent mode, the saw blade 255 contacts the object to be cut and performs the cut. At this time, the saw blade 255 is located on the left side of the operator, the auxiliary handle 213 is facing upward, the main handle 212 is located above the housing 211, and the protective cover 250 is in the first position relative to the head shell 2110.

[0094] Reference Figure 23 As shown, in the orthographic mode, the maximum cutting depth R21 that the saw blade 255 can achieve is determined by the portion of the saw blade 255 exposed outside the protective edge 250b of the protective part 250a. The maximum cutting depth R21 shown in the figure is the distance between the edge of the protective base plate 260 and the tangent line of the outer edge of the saw blade 255.

[0095] When the saw blade diameter is 210mm, the maximum cutting depth R21 reaches 80mm; the ratio of the maximum cutting depth R21 to the saw blade radius reaches 76.19%, that is, the saw blade utilization rate reaches 76.19%.

[0096] Reference Figure 24 , Figure 25As shown, in reverse cutting mode, the saw blade 255 is located on the operator's left, the auxiliary handle 213 faces downwards, the main handle 212 is located below the housing 211, and the guard 250 is in the second position relative to the head shell 2110. At this time, the maximum cutting depth R22 of the saw blade 255 is equivalent to the maximum cutting depth R21 in forward cutting mode. When the diameter of the saw blade 255 is 210mm, the maximum cutting depth R22 is 80mm; the ratio of the maximum cutting depth R22 to the saw blade radius reaches 76.19%.

[0097] The maximum cutting depth R21 in forward cutting mode and the maximum cutting depth R22 in reverse cutting mode are positioned parallel to the motor axis. This makes it easier to achieve a large cutting depth during vertical cutting. For example, when cutting a switch panel bottom box, if the object being cut, W, is at the same height as the operator's hand, direct vertical cutting is more in line with the operator's usage habits. Preferably, when the maximum cutting depth is designed to coincide with the motor axis, this design allows vertical cutting to achieve the cutting purpose, making grooving easier and more beneficial to the operator.

[0098] Reference Figure 26 As shown, the airflow introduced into the motor housing through the air guide enters the interior of the head housing 2110 through the air inlet 2118. The two airflows, as indicated by the arrows, flow through both sides of the transmission mechanism and are discharged from the air outlet 2119 on the front end face of the head housing 2110, thus fully cooling the gear transmission mechanism inside the head housing.

[0099] See Figure 5 and Figure 18As shown, this application relates to a protective cover (50, 250) that can be installed on the mounting part (17, 217) of a grooving machine (10, 210). The protective cover (50, 250) includes a protective part (50a, 250a), which is provided with a hoop (52, 252) that mates with the mounting part (17, 217). The protective part (50a, 250a) also includes a protective surface (501, 2501), on which a protective surface (501, 2501) is provided near the hoop (52, 252) and transverse to the protective surface (501, 2501). The protective base plates (60, 260) include a first protective base plate (601, 2601) and a second protective base plate (602, 2602). The protective covers (50, 250) are operably switchable between a first position and a second position relative to the mounting parts (17, 217). In both positions, the vertical distances (L1, L2) between the center of the clamping rings (52, 252) and the plane containing the first and second protective base plates (601, 2601) are equal, and the vertical distances are greater than 20 mm and less than 26 mm. Optionally, the protective base plates (60, 260) have an outer peripheral surface close to the grooving machine saw blade (55, 255). In both the first and second positions, the minimum distances (D1, D2) between the center of the clamping rings (52, 252) and the outer peripheral surface are greater than 20 mm and less than 26 mm. The first and second positions will correspond to the installation requirements of the grooving machine (10, 210) in the forward and reverse tangent modes. The first and second positions are rotated at least 30 degrees relative to the center of the hoop (52, 252). For example, the first position is rotated 45 degrees or 60 degrees relative to the center of the hoop (52, 252) to reach the second position.

[0100] The protective base plate (60, 260) also includes wear-resistant plates (61, 261). There is a gap (65, 265) between the first protective base plate (601, 2601) and the second protective base plate (602, 2602). The wear-resistant plates (61, 261) abut against the first protective base plate (601, 2601) and the second protective base plate (602, 2602) to seal the gap (65, 265). The first protective base plate (601, 2601), the second protective base plate (602, 2602) and the wear-resistant plates (61, 261) together form the outer perimeter of the grooving machine saw blade.

[0101] Due to limitations in the size of the output shaft, bearings, etc., the size of the mounting section is fixed. Only when the center of the hoop is sufficiently small from the outer surface of the protective cover can the grooving machine achieve a sufficiently large cutting depth. When the protective cover is in the first position, the grooving machine is in forward cutting mode; when it is in the second position, it is in reverse cutting mode. When the protective cover is in both positions, the vertical distance from the center of the hoop to the planes of the first and second protective base plates is between 20mm and 26mm, such as 22mm, 23mm, 24mm, 24.5mm, 25mm, 25.5mm, or 25.8mm. Alternatively, when the protective cover is in both positions, the minimum distance from the center of the hoop to the outer surface is equal, between 20mm and 26mm, such as 22mm, 23mm, 24mm, 24.5mm, 25mm, 25.5mm, or 25.8mm. In this way, the same protective cover can meet the operational requirements of both forward and reverse cutting modes of the grooving machine and achieve a larger cutting depth.

[0102] When the protective covers (50, 250) are connected to the mounting parts (17, 217) of the grooving machines (10, 210), the screws (115, 2115) at the front end of the grooving machines (10, 210) will interfere with the protective covers (50, 250). In particular, the protective covers (50, 250) can be operably switched between a first position and a second position relative to the mounting parts (17, 217). That is, the same protective cover needs to meet the cutting depth requirements of the grooving machines (10, 210) in both the forward and reverse cutting modes at different mounting positions. The notches (65, 265) and the anti-wear plates (61, 261) allow the space occupied by the screws (115, 2115) to be avoided. The cutting depths in the forward and reverse cutting modes are comparable and sufficiently large.

[0103] See Figures 27-29As shown, this application also relates to a protective cover 250, which can be installed on the mounting part 217 of the grooving machine 210. The protective cover 250 includes a protective part 250a and an anti-wear plate 261. The protective part 250a includes a protective surface 2501. A pair of protective base plates 260 are provided on the protective surface 2501, which are transverse to the protective surface 2501. The protective base plates 260 are arranged perpendicularly or substantially perpendicularly to the protective surface 2501. The protective base plates 260 include a first protective base plate 2601 and a second protective base plate 2602. The first protective base plate 2601 and the second protective base plate 2602 are arranged perpendicularly or substantially perpendicularly to the protective surface 2501. The anti-wear plate 261 is used to connect with the first protective base plate 2601 and the second protective base plate 2602. The anti-wear plate 261 has a first end 2611 and a second end 2612 opposite to the first end 2611. A notch 265 is provided between the first protective base plate 2601 and the second protective base plate 2602. The notch 265 can accommodate the head shell 2110 of the grooving machine 210, allowing the protective cover 250 to be operably switched between a first position and a second position relative to the mounting part 217. The abrasion plate 261 is used to seal the notch 265 to prevent the head shell 2110 from being worn during the use of the grooving machine 210. In addition, the abrasion plate 261 also serves to prevent dust and water from entering the grooving machine or affecting the operator during the operation of the grooving machine 210. Figure 27 As shown, the protective cover 250 is located in the first position, with its first end 2611 connected to the first protective base plate 2601 by screws 3116, and its second end 2612 connected to the second protective base plate 2602 by screws 3116. Figure 28 As shown, the abrasion plate 261 is removed from the protective base plate 260 and rotated 180 degrees until... Figure 29 In the second position shown, when the protective cover 250 is in the second position, the first end 2611 is connected to the second protective base plate 2602 by screws 3116, and the second end 2612 is connected to the first protective base plate 2601 by screws 3116. Optionally, the abrasion plate 261 can also be an elastic element that directly abuts against the inner wall of the protective base plate 260, and the abrasion plate 261 can switch between the first position and the second position to meet the cutting depth requirements of the grooving machine 210 in both forward and reverse cutting modes.

[0104] The gap 265 between the non-interconnected first protective base plate 2601 and the second protective base plate 2602 allows the guard 250 to connect to the head shell 2110 of the grooving machine 210 at different positions. These two connection positions meet the usage requirements of both the forward and reverse cutting modes of the grooving machine 210. The connection method is simple, and after connection, the same guard can meet the same cutting depth requirements for both forward and reverse cutting modes of the grooving machine 210. Furthermore, the ratio of the maximum cutting depth to the saw blade radius is not less than 72%, allowing users to meet large cutting depth requirements even with a 195mm saw blade. Thus, the same guard can meet the usage needs of users with different habits, whether they are accustomed to forward or reverse cutting modes. In addition, by sealing the gap 265 with the wear-resistant plate 261, the head shell 2110 of the grooving machine 210 is less prone to wear during use. The wear-resistant plate 261 also prevents dust and cooling water generated during cutting from entering the interior of the grooving machine 210 and the operator's position, reducing the adverse effects on the performance of the grooving machine 210 during use.

[0105] The protective part 250a is provided with a hoop 252 that mates with the mounting part 217. The protective surface 2501 has an arc-shaped outer contour. The plane passing through the center line of the hoop 252 and the center of the outer contour is defined as the central plane Z of the protective surface 2501. The first protective base plate 2601 and the second protective base plate 2602 are symmetrically arranged along the central plane Z. This makes it more convenient to install the cover 250 at both positions.

[0106] The protective part 250a is provided with a hoop 252 that mates with the mounting part 217. The cover 250 has a protective edge 250b located on one side of the protective part 250a. The hoop 252 fits into at least one protective edge 250b without gap. The smaller the distance between the hoop 252 and the protective edge 250b, the greater the cutting depth. The cutting depth can be maximized when the hoop 252 fits into the protective edge 250b without gap. Due to manufacturing and installation tolerances, a distance of less than 1 mm between the hoop 252 and the protective edge 250b is considered to be a gapless fit.

[0107] See Figure 30As shown, this application relates to a protective cover 50, which can be installed on the mounting part 17 of a grooving machine 10. The protective cover 50 includes a protective part 50a and an anti-wear plate 61. The protective part 50a includes a protective surface 501. A pair of protective base plates 60 are provided on the protective surface 501, which are transverse to the protective surface 501. The protective base plates 60 are arranged perpendicularly or substantially perpendicularly to the protective surface 501. The protective base plates 60 include a first protective base plate 601 and a second protective base plate 602. The first protective base plate 601 and the second protective base plate 602 are arranged perpendicularly or substantially perpendicularly to the protective surface 501. The anti-wear plate 61 is used to abut against the first protective base plate 601 and the second protective base plate 602. The anti-wear plate 61 has a first end 611 and a second end 612 opposite to the first end 611. A notch 65 is provided between the first protective base plate 601 and the second protective base plate 602. The notch 65 can accommodate the head shell 110 of the grooving machine 10, allowing the protective cover 50 to be operably switched between a first position and a second position relative to the mounting part 17. An anti-wear plate 61 is used to seal the notch 65 to prevent wear on the head shell 110 during use. Additionally, the anti-wear plate 61 also serves as a dust and water barrier, preventing dust and cooling water from entering the grooving machine or affecting the operator during operation. When the protective cover 50 is in the first position, the first end 611 is connected to the first protective base plate 601 by screws 4116, and the second end 612 has a hook-like structure that directly surrounds the outside of the second protective base plate 602. Figure 30 As shown, after the abrasion plate 61 is removed from the protective base plate 60, it is rotated 180 degrees and abuts against the protective base plate 60. The protective cover 50 is in the second position. The first end 611 is connected to the second protective base plate 602 by screws 4116. The second end 612 has a hook-shaped structure and directly surrounds the outside of the first protective base plate 601.

[0108] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0109] It should be noted that "a certain body" or "a certain part" can be a portion of the corresponding "component," meaning that "a certain body" or "a certain part" is integrally formed and manufactured with the "other parts of the component"; or it can be an independent component that can be separated from the "other parts of the component," meaning that "a certain body" or "a certain part" can be manufactured independently and then combined with the "other parts of the component" to form a whole. The expression of "a certain body" or "a certain part" in this application is only one embodiment for ease of reading, and is not intended to limit the scope of protection of this application. Any technical solution that includes the above features and has the same function should be understood as an equivalent technical solution of this application.

[0110] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0111] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; this manner of description is merely for clarity, and those skilled in the art should consider the specification as a whole. Within the framework of this application, the technical features of the above embodiments or different embodiments can also be appropriately combined, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0112] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A protective cover, which can be installed on the mounting part of a grooving machine, comprising: The protective part is provided with a hoop that mates with the mounting part. The protective part also includes a protective surface. The protective surface is provided with a protective base plate that is close to the hoop and transverse to the protective surface. The protective base plate includes a first protective base plate and a second protective base plate. The feature is that the protective cover is operably switchable between a first position and a second position relative to the mounting part, and the vertical distance between the center of the hoop and the plane where the first protective base plate and the plane where the second protective base plate are located is greater than 20mm and less than 26mm.

2. The protective cover as described in claim 1, characterized in that: The protective base plate also includes an abrasion-resistant plate. There is a gap between the first protective base plate and the second protective base plate. The abrasion-resistant plate abuts against the first protective base plate and the second protective base plate to seal the gap.

3. The protective cover as described in claim 2, characterized in that: The abrasion plate has a first end and a second end opposite to the first end. When the protective cover is in the first position, the first end abuts against the first protective base plate, and the second end abuts against the second protective base plate. When the protective cover is in the second position, the first end abuts against the second protective base plate, and the second end abuts against the first protective base plate.

4. The protective cover as described in claim 1, characterized in that: The protective surface has an arc-shaped outer contour. The plane passing through the center line of the hoop and the center of the outer contour is defined as the central plane of the protective surface. The first protective base plate and the second protective base plate are symmetrically arranged along the central plane.

5. The protective cover as described in claim 2, characterized in that: The protective cover has a protective edge located on one side of the protective part, and the hoop fits seamlessly with at least one side of the protective edge or the abrasion plate.

6. A grooving machine, comprising a main body; The main handle and auxiliary handle are provided on the main body; The mounting portion of the main body is provided for connecting the protective cover; The main body includes a motor and an output shaft driven by the motor, the output shaft being used to mount a saw blade, the saw blade being rotatable about the axis of the output shaft, and the cover covering at least a portion of the saw blade; Its features are: The grooving machine includes a protective cover as described in any one of claims 1 to 5, defining a forward cutting mode with the grooving machine saw blade located to the left of the operator, the auxiliary handle facing upward, and the protective cover in a first position; defining a reverse cutting mode with the grooving machine saw blade located to the left of the operator, the auxiliary handle facing downward, and the protective cover in a second position; the grooving machine is operable in either forward cutting mode or reverse cutting mode, and the saw blade has the same maximum cutting depth in both forward cutting mode and reverse cutting mode.

7. The grooving machine as described in claim 6, characterized in that: The ratio of the maximum cutting depth to the saw blade radius shall not be less than 73.8%.

8. The grooving machine as described in claim 6, characterized in that: The main body includes a main shell and a head shell. A transmission mechanism is provided inside the head shell. The transmission mechanism includes a transmission shaft arranged parallel to the output shaft. The head shell includes a front shell portion arranged around the output shaft and a rear shell portion arranged around the transmission shaft. The mounting portion is arranged around the output shaft. The protective cover is installed after the mounting portion. The outer surface of the hoop is flush with the outer surface of the front shell portion.

9. The grooving machine as described in claim 8, characterized in that: The diameter of the mounting part is not greater than 43mm and not less than 40cm.

10. The grooving machine as described in claim 8, characterized in that: The front shell and the rear shell are semi-circular, and an inner recess is formed at the connection position of the front shell and the rear shell, and the inner recess is provided with screw holes.

11. The grooving machine as described in claim 8, characterized in that: The motor has a motor axis, and the front end of the front housing is provided with two screw holes, which are arranged symmetrically with respect to the motor axis.

12. The grooving machine as described in claim 6, characterized in that: The main handle and the auxiliary handle are located on the same side of the main body. The main handle is configured as a D-shaped handle, and the auxiliary handle is configured as a straight handle.

13. The grooving machine as described in claim 6, characterized in that: The main body is provided with a motor housing for housing the motor and a handle housing for connecting the main handle. The handle housing is provided with an air inlet area, which includes a plurality of air inlets. Each air inlet is provided with a guide section that extends obliquely toward the motor housing so that gas entering from the air inlet is guided to the motor housing. The angle of the guide section is not less than 30 degrees and not more than 45 degrees.

14. The grooving machine as described in claim 13, characterized in that: The main body is provided with a head shell located at the front of the motor housing. The head shell is provided with an air outlet area, which includes a plurality of air outlets. At least some of the air outlets are symmetrically arranged along the center line of the front end face of the head shell.

15. A grooving machine, characterized in that: Includes the protective cover as described in any one of claims 1 to 5.

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