Electric tool with good protection performance

Abstract

The utility model discloses an electric tool with good protection performance, which relates to the technical field of electric tools and comprises a rotating shaft, a processing disc, a first pressure disc and a second pressure disc, the rotating shaft is connected with a driving motor, a machining disc is installed at one end of the rotating shaft, and a first pressing disc and a second pressing disc for fixing the machining disc are rotationally connected to the two sides of the machining disc correspondingly; the second pressing disc is of a hollow disc structure, a circular groove is formed in the middle of the outer side of the second pressing disc, a piston cylinder is embedded in the circular groove, a piston is movably connected into the piston cylinder, a push-pull disc is rotationally connected to one end of a piston rod of the piston, and an air bag capable of expanding and deforming outwards is fixed to the middle of the outer side of the piston cylinder. The air bag is inflated and deformed to be attached to the inner wall of the round hole to form the protective barrier, the water cooling liquid is effectively prevented from entering the thread position of the rotating shaft through the through hole in the outer side of the second pressing plate, corrosion of threads at the end of the rotating shaft is avoided, and the service life of the electric tool is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool technical field, concretely is electric tool with good protective property. BACKGROUND

[0002] In the field of cutting and polishing electric tools, especially high-load operation equipment such as slotting machines, a large amount of heat and dust will be generated during the working process, so cooling and dustproof measures are crucial. At present, the industry generally adopts the mode of combining a water cooling system with working accessories to continuously cool the high-speed rotating saw blade or other processing accessories through water source delivery, and at the same time, to reduce dust accumulation by using water flow scouring, thereby achieving double protection of the equipment.

[0003] However, this cooling method has certain defects in actual application; the pressure plate needs to be tightly fitted and fixed on the output shaft to ensure the safe and stable operation of the saw blade; but during the water cooling process, water can easily penetrate into the interface part between the pressure plate and the output shaft, especially the threaded structure at the end of the output shaft; once the water stays for a long time, not only will the thread rust and corrode, reducing its mechanical properties, but also the engagement effect between the thread and the pressure plate will be deteriorated due to corrosion, increasing the difficulty of disassembling and assembling the pressure plate, and seriously affecting the quick replacement of the saw blade and the maintenance of the equipment. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides an electric tool with good protection.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] An electric tool with good protection, comprising a rotating shaft, a processing disc, a first pressure plate and a second pressure plate; the rotating shaft is connected with a driving motor, one end of the rotating shaft is provided with the processing disc, and the two sides of the processing disc are respectively provided with the first pressure plate and the second pressure plate which are fixed thereon;

[0007] The second pressure plate is a hollow disc structure, a circular groove is formed in the middle of the outer side of the second pressure plate, a piston cylinder is embedded and installed in the inside of the circular groove, a piston is movably connected in the inside of the piston cylinder, a piston rod of the piston is rotatably connected with a push-pull disc, a gas bag which can be deformed outward is fixed in the middle of the outer side of the piston cylinder, a cavity in the piston cylinder is communicated with the gas bag, and a circular hole is formed in the second pressure plate corresponding to the gas bag.

[0008] When the second pressure plate is screwed on the rotating shaft, the push-pull disc in the second pressure plate is extruded by the end of the rotating shaft, the push-pull disc pushes the piston, the piston moves to inflate the gas bag, and the gas bag deforms to fit the surface of the circular hole.

[0009] Preferably, the second pressing plate is arranged as a horizontal part in the circular hole near the position of the piston cylinder, and one end of the horizontal part is arranged as an arc-shaped part.

[0010] Preferably, the air bag is arranged as a ring shape, a connecting rod is fixedly arranged in the middle of the ring shape and vertically fixed to the piston cylinder, a disc is fixed to the end of the connecting rod, the air bag is in contact with the disc when the air bag is deformed, the air bag is limited to deform outward, and the air bag is deformed to be attached to the inner wall of the circular hole outward of the circumference of the disc.

[0011] Preferably, a rubber pad is arranged at the position where the piston cylinder is connected to the inner wall of the second pressing plate.

[0012] Preferably, a plurality of rotatable balls are embeddedly arranged on one side of the push-pull plate facing the end of the rotating shaft.

[0013] Preferably, the piston is not pushed to the maximum stroke when the air bag is deformed to be attached to the inner wall of the circular hole.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1. A protective barrier is formed to prevent the water cooling liquid from entering, the air bag is deformed to be attached to the inner wall of the circular hole to form a protective barrier, the water cooling liquid is effectively prevented from entering the threaded position of the rotating shaft through the through hole on the outer side of the second pressing plate, the threaded corrosion of the end of the rotating shaft is avoided, and the service life of the electric tool is improved.

[0016] 2. The special structure design enhances the protective effect, the second pressing plate is arranged as a horizontal part and an arc-shaped part in the circular hole near the position of the piston cylinder, which helps the air bag to be better attached to the inner wall of the circular hole and enhances the protective effect, and even if the liquid enters the circular hole, the liquid can flow out or be thrown out along the arc-shaped part, further preventing the water cooling liquid from entering the threaded position of the rotating shaft.

[0017] 3. The piston cylinder plays a sealing role, the installed piston cylinder is equivalent to a sealing structure, and the service life of the equipment is improved.

[0018] 4. The detail design guarantees the performance, the rubber pad at the position where the piston cylinder is connected to the inner wall of the second pressing plate enhances the sealing property and prevents the liquid from entering through the connecting position, the rotatable balls embedded on the push-pull plate reduce the friction force when the rotating shaft is extruded, and the piston does not reach the maximum stroke when the air bag is deformed, so that the air bag has enough pressure to maintain the protective state. BRIEF DESCRIPTION OF DRAWINGS

[0019] The disclosed content of the utility model will be explained with reference to the drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the protection scope of the utility model, in the drawings, the same reference signs are used to refer to the same parts. Among them:

[0020] Figure 1 It is a whole three-dimensional structure schematic view of the utility model protective electric tool.

[0021] Figure 2 The top view of the electric tool with good protection of the utility model;

[0022] Figure 3 The A-A sectional view of the electric tool with good protection of the utility model;

[0023] Figure 4 The B-B sectional view of the electric tool with good protection of the utility model; Figure 3 The structural schematic view of the A of the utility model.

[0024] The figure mark explanation: 1, rotating shaft; 2, processing disc; 3, first pressure plate; 4, second pressure plate; 5, piston cylinder; 6, piston; 7, push-pull disc; 8, air bag; 9, round hole; 91, horizontal part; 92, arc part. DETAILED DESCRIPTION

[0025] It is easy to understand that according to the technical scheme of the utility model, a plurality of structure modes and implementation modes that can be mutually replaced can be proposed by the general technical personnel in the field without changing the essential spirit of the utility model. Therefore, the following detailed description and drawings are only exemplary description of the technical scheme of the utility model, and should not be regarded as the whole of the utility model or regarded as the limitation or restriction of the technical scheme of the utility model.

[0026] EMBODIMENT

[0027] As Figures 1-4 shown, an electric tool with good protection includes rotating shaft 1, processing disc 2, first pressure plate 3 and second pressure plate 4; rotating shaft 1 is connected with driving motor, one end of rotating shaft 1 is installed with processing disc 2, both sides of processing disc 2 are respectively screwed with first pressure plate 3 and second pressure plate 4 fixed to it;

[0028] When driving motor starts, rotating shaft 1 drives processing disc 2 to rotate at high speed; in the installation process, second pressure plate 4 is screwed to rotating shaft 1, at this time, end part of rotating shaft 1 extrudes push-pull disc 7, push-pull disc 7 pushes piston 6 to move in piston cylinder 5, piston 6 inflates air bag 8; air bag 8 deforms due to inflation, air bag 8 mainly deforms to the outside of disc circumference and adheres to the inner wall of round hole 9, thereby forming a protective barrier, so that water cooling liquid cannot enter the threaded position of rotating shaft 1 through the through hole on the outside of second pressure plate 4, so that the end thread of rotating shaft 1 will not rust, and the service life of electric tool is improved;

[0029] The second pressure plate 4 is arranged as a horizontal part 91 near the position of the piston cylinder 5 in the circular hole 9, and one end of the horizontal part 91 is arranged as an arc-shaped part 92; this design helps the air bag 8 to better fit the inner wall of the circular hole 9, enhances the protection effect, and at the same time, even if liquid enters the circular hole 9, it will flow out along the arc-shaped part 92 or be thrown out, further preventing the water cooling liquid from entering the threaded position of the rotating shaft 1; and the installed piston cylinder 5 also serves as a sealing structure, improving the service life of the equipment.

[0030] The rotating shaft 1 and the machining disc 2: the rotating shaft 1 is connected with the driving motor to provide power for the whole tool; the machining disc 2 installed at one end is a key component for performing specific machining tasks.

[0031] The first pressure plate 3 and the second pressure plate 4: the first pressure plate 3 and the second pressure plate 4 are respectively screwed on both sides of the machining disc 2, used to stabilize the machining disc 2 and ensure its stability during high-speed rotation; among them, the second pressure plate 4 is a hollow disc structure, and a circular groove is formed in the middle of the outer side for installing the piston cylinder 5.

[0032] The piston cylinder 5, the piston 6 and the push-pull disc 7: the piston cylinder 5 is installed in the circular groove of the second pressure plate 4, and the piston 6 is movably connected inside the piston cylinder 5; the piston rod of the piston 6 is rotatably connected with the push-pull disc 7; when the second pressure plate 4 is screwed onto the rotating shaft 1, the end of the rotating shaft 1 will press the push-pull disc 7, thereby pushing the piston 6 to move in the piston cylinder 5.

[0033] The air bag 8 and the circular hole 9: the air bag 8 is fixed to the middle of the outer side of the piston cylinder 5, and the cavity in the piston cylinder 5 is communicated with the air bag 8; the second pressure plate 4 is provided with a circular hole 9 corresponding to the air bag 8; when the piston 6 is pushed by the push-pull disc 7 to move, it will inflate the air bag 8, causing the air bag 8 to deform and fit the surface of the circular hole 9.

[0034] The horizontal part 91 and the arc-shaped part 92: the second pressure plate 4 is arranged as a horizontal part 91 near the position of the piston cylinder 5 in the circular hole 9, and one end of the horizontal part 91 is arranged as an arc-shaped part 92; this design helps the air bag 8 to better fit the inner wall of the circular hole 9, enhances the protection effect, and at the same time, even if liquid enters the circular hole 9, it will flow out along the arc-shaped part 92 or be thrown out.

[0035] Special structure of the air bag 8: the air bag 8 is arranged as a ring, a connecting rod perpendicular to the piston cylinder 5 is fixed in the middle of the ring, and a disc is fixed at the end of the connecting rod; when the air bag 8 is inflated and deformed, it will contact the disc, thereby limiting its deformation towards the center of the disc, making it mainly deform towards the outside of the disc circumference, and tightly fit the inner wall of the circular hole 9.

[0036] Other details design: the piston cylinder 5 with the second pressure plate 4 inner wall junction is provided with rubber pad, can strengthen the leakproofness, prevents the liquid from entering through the junction; the push-pull plate 7 one side facing the rotating shaft 1 end portion is embedded and is installed with a plurality of rotatable ball, reduces the friction when the rotating shaft 1 extrusion push-pull plate 7, simultaneously, when the air bag 8 deformation and the round hole 9 inner wall adhere, the piston 6 is not pushed to the maximum stroke, ensure that the air bag 8 has enough pressure to maintain the protection state.

[0037] The technical scope of the utility model is not only limited to the contents in the above description, and the skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical thought of the utility model, and these deformations and modifications should all belong to the protection scope of the utility model.

Claims

1. A power tool with good protective properties, characterized in that: Including rotating shaft (1), processing disc (2), first pressing disc (3) and second pressing disc (4);The rotating shaft (1) is connected with the driving motor, and the one end of rotating shaft (1) is provided with processing disc (2), and the both sides of processing disc (2) are respectively screwed with first pressing disc (3) and second pressing disc (4) fixed to it; The second pressing disc (4) is a hollow disc structure, and a circular groove is formed in the middle of the outer side of the second pressing disc (4), the piston cylinder (5) is embedded and installed in the circular groove, the piston (6) is movably connected in the piston cylinder (5), the piston rod of the piston (6) is rotatably connected with the push-pull disc (7), the air bag (8) that can be deformed outward is fixed in the middle of the outer side of the piston cylinder (5), the cavity in the piston cylinder (5) is communicated with the air bag (8), and the second pressing disc (4) is provided with a circular hole (9) corresponding to the air bag (8); When the second pressing disc (4) is screwed on the rotating shaft (1), the push-pull disc (7) in the second pressing disc (4) is extruded by the end of the rotating shaft (1), the push-pull disc (7) pushes the piston (6), the piston (6) moves to inflate the air bag (8), and the air bag (8) is deformed to fit the surface of the circular hole (9).

2. The electric power tool according to claim 1, wherein: The second pressing disc (4) is provided with a horizontal part (91) at the position close to the piston cylinder (5) in the circular hole (9), and one end of the horizontal part (91) is provided with an arc-shaped part (92).

3. The electric power tool according to claim 2, wherein: The air bag (8) is provided as an annular shape, a connecting rod is fixedly connected with the piston cylinder (5) in the middle of the annular shape, a disc is fixedly connected with the end of the connecting rod, the air bag (8) is deformed to contact the disc, the air bag (8) is limited to deform outward, and the air bag (8) deforms outward to the outer side of the disc and fits the inner wall of the circular hole (9).

4. The electric power tool according to claim 3, wherein: The piston cylinder (5) is provided with a rubber pad at the connecting position with the inner wall of the second pressing disc (4).

5. The electric power tool according to claim 4, wherein: The push-pull disc (7) is embedded and installed with a plurality of rotatable balls on the side facing the end of the rotating shaft (1).

6. The electric power tool according to claim 5, wherein: When the air bag (8) is deformed to fit the inner wall of the circular hole (9), the piston (6) is not pushed to the maximum stroke.

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