CN212122778U

CN212122778U - Electric grinding tool

Info

Publication number: CN212122778U
Application number: CN201922467573.6U
Authority: CN
Inventors: 王震
Original assignee: Suowak Suzhou Tool Technology Co ltd
Current assignee: Suowak Suzhou Tool Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-12-11
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses an electric grinding tool, be in including working head (12), grip shell (11), motor housing (1), setting grip shell (11) with middle lid (5), motor (2) and drive mechanism (13) that have motor fan blade (3) between motor housing (1), drive mechanism (14) include pipe box (7), pipe box (7) with grip and form wind channel (6) between shell (11), middle lid (5) with the cooling air current that motor fan blade (3) produced wind channel and outside atmosphere communicate each other. The utility model discloses can effectively reduce the temperature at electronic grinding tool gripping position, avoid causing the damage to user's hand, realize long-time work, the security performance is high, just the utility model discloses a high accuracy bearing has improved the precision and the efficiency of processing of polishing.

Description

Electric grinding tool

Technical Field

The utility model relates to an electric tool field, in particular to electronic grinding tool.

Background

The electric grinding tool is mainly used for the precise grinding and abrading of materials such as metal, plastic, wood, stone and the like.

The middle lid of using is connected to present electric grinding tool's intermediate mechanism all is outside air-out design, and this kind of outside air-out design has two kinds of air-out modes, and one kind is that outside air-out direction is forward, and this kind of air-out mode can slightly reduce the surface temperature that electric grinding tool head gripped the mechanism, but this kind of air-out mode directly blows hot-blast and dust on user's hand, and the temperature of wind is up to more than 45 degrees centigrade, has the risk of scalding user's hand, and influences normal work.

The other type is to the air-out all around, and this kind of air-out mode can avoid directly blowing hot-blast and dust at user's hand, but the cooling function is poor, and the temperature that electronic grinding tool head held the mechanism is very high, influences the long-time use of instrument.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the above-mentioned defect among the prior art, provide an electronic grinding tool, can effectively reduce the temperature at electronic grinding tool portion of gripping, avoid causing the damage to user's hand, realize long-time work, the security performance is high.

For realizing the utility model discloses the purpose, the utility model provides an electronic grinding tool, be in including working head, gripping shell, motor housing, setting grip the shell with middle lid between the motor housing, motor and the drive mechanism who has the motor fan blade, drive mechanism includes pipe box and second bearing, the pipe box with grip and form the wind channel between the shell, middle lid with the cooling air current that the motor fan blade produced wind channel and outside atmosphere communicate each other.

Furthermore, the utility model discloses still include following subsidiary technical scheme:

the middle cover further comprises an inner air opening, an outer air opening, a supporting pipe, an outer ring, an inner ring and a rib plate.

The inner air opening is a trapezoidal through hole, the inner air opening is arranged between the inner ring and the outer ring, and the inner air opening is respectively communicated with the air channel and the cooling air in an airflow mode.

The outer air opening is a square hole, the outer air opening is arranged on the right side, the rear side and the left side of the outer ring along the circumferential direction of the outer ring, and the outer air opening is communicated with the inner air opening and the atmosphere respectively.

The supporting tube is a hollow cylindrical tube and is integrally formed on the inner ring, the supporting tube is arranged in the tube sleeve and tightly abuts against the second bearing, the outer wall of the supporting tube is tightly matched with the inner wall of the tube sleeve, a boss is arranged between the inner ring and the outer wall of the supporting tube, and the tail end of the tube sleeve tightly abuts against the boss.

The motor comprises a motor output shaft, and the motor output shaft is arranged in the inner ring and the supporting pipe.

The inner ring is arranged in the outer ring, the outer ring and the inner ring are coaxial, the inner radius of the outer ring is R, the outer radius of the inner ring is R1, R is larger than R1, the rib plate is arranged between the outer ring and the inner ring, the rib plate divides the circular space between the outer ring and the inner ring into a plurality of trapezoidal through holes, the trapezoidal through holes are the inner air ports, and 4 threaded holes are symmetrically distributed in the outer ring.

The middle cover is arranged between the holding shell and the motor shell, the middle cover, the motor shell and the holding shell are detachably connected through bolts, the front side of the middle cover faces the direction of the hand of a user when the electric tool is used, and damage to the user caused by hot air exhausted from the outer air opening is avoided.

Compared with the prior art, the utility model discloses the advantage lies in:

the utility model discloses a lid in the middle of setting up to cover the interior wind gap and the outer wind gap that set up mutual intercommunication in the middle of, wherein the cooling air current that the interior wind gap produced the motor communicates with the wind channel each other, and the outer wind gap communicates with outside atmosphere, will like this the utility model discloses when using more than ambient temperature 30 degrees centigrade, the heat that its motor produced of working for a long time carries out the cold and heat exchange with the cooling air current and cools down rapidly in getting into the wind channel through interior wind gap on the one hand, on the other hand also can discharge into in the atmosphere through the outer wind gap with outside atmosphere intercommunication.

The utility model discloses when using more than ambient temperature 30 degrees centigrade, the temperature that can make the shell that grips of electronic grinding tool avoids causing the damage to the user below the long-time operating temperature 45 degrees centigrade that the human body can accept, realizes long-time work, and the security performance is high.

Drawings

Fig. 1 is an assembly view of the electric grinding tool of the present invention.

Fig. 2 is a side view of a grip housing of the powered abrasive tool of fig. 1.

Fig. 3 is a cross-sectional view of the grip housing of fig. 2 taken along the direction a-a.

Fig. 4 is a cross-sectional view of the powered abrasive tool of fig. 1 taken along the direction B-B.

Fig. 5 is a front view of the middle cover of the electric grinding tool of the present invention.

Fig. 6 is a rear view of the middle cover of the electric grinding tool of the present invention.

Fig. 7 is a right side view of the middle cover of the electric grinding tool of the present invention.

Fig. 8 is a cross-sectional view of the intermediate lid of fig. 6 taken along the direction C-C.

Fig. 9 is a front view of the front cover of the electric grinding tool of the present invention.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings.

As shown in fig. 1, the electric grinding tool mainly includes a working head 12, a holding shell 11, an intermediate cover 5, a motor shell 1, a motor 2 having a motor blade 3, and a transmission mechanism 14 disposed between the working head 12 and the motor 2. Correspondingly, the present invention is a direct grinding machine, the motor 2 drives the working head 12 to rotate at high speed through the transmission mechanism 14, and the grinding accessories (not shown) installed on the working head 12 can precisely grind and grind metal, plastic, wood, stone and other materials.

As shown in fig. 2 and 3, the grip housing 11 is made of plastic material, the top end 19 and the end 20 of the grip housing 11 are in a truncated cone shape, the portion between the top end 19 and the end 20 is in a cylindrical shape, the minimum diameter of the top end 19 is d1, the maximum diameter of the end 20 is d2, the portion between the top end 19 and the end 20 is d, and d1 < d 2; 8 air duct openings 16 are arranged at the top end 19 of the holding shell 11, and the 8 air duct openings 16 are distributed at equal intervals at the top end 19 of the holding shell 11 along the circumferential direction; 8 convex ribs 15 are arranged inside the holding shell 11, the convex ribs 15 are in a strip shape and are distributed at equal intervals along the circumferential direction of the holding shell 11, and the convex ribs 15 and the holding shell 11 are integrally formed and extend from the top end 19 of the holding shell 11 to the tail end 20 of the holding shell 11; the end 20 of the holding shell 11 is provided with a connecting disc 17, and 4 threaded holes 18 are symmetrically distributed on the connecting disc 17.

As shown in fig. 4, the ribs 15 contact with the outer wall 23 of the pipe sleeve 7 to form 8 air ducts 6, the 8 air ducts 6 extend from the end 20 of the grip housing 11 to the top end 19 of the grip housing 11, and each air duct 6 is correspondingly communicated with a corresponding air duct opening 16, so that the air flow in the air duct 6 can be discharged to the atmosphere through the air duct openings 16.

As shown in fig. 5 and 6, the intermediate cover 5 includes an inner tuyere 29, an outer tuyere 30, a support tube 35, an outer ring 31, an inner ring 32, and a rib plate 33.

The inner air opening 29 is a trapezoidal through hole, the inner air opening 29 is arranged between the inner ring 32 and the outer ring 31, the inner air opening 29 is respectively communicated with the air duct 6 and cooling air flow generated by the rotation of the motor fan blade 3, and the inner air opening 29 is communicated with the outer air opening 30.

As shown in fig. 7, the outer tuyere 30 is a square hole, the outer tuyere 30 is provided on the right side 39, the rear side 40 and the left side 41 of the outer ring 31 in the circumferential direction of the outer ring 31, and the outer tuyere 30 is communicated with the atmosphere.

As shown in fig. 1, 7 and 8, the support tube 35 is a hollow cylindrical tube integrally formed on the inner ring 32, 8 bosses 37 are provided between the inner ring 32 and the support tube outer wall 36, the support tube 35 is disposed in the socket 7, and the support tube outer wall 36 is in close contact with the inner wall 24 of the socket 7.

An inner ring 32 is arranged in the outer ring 31, the outer ring 31 and the inner ring 32 are coaxial, the inner radius of the outer ring 31 is R, the outer radius of the inner ring 32 is R1, R is larger than R1, a rib plate 33 is arranged between the outer ring 31 and the inner ring 32, the rib plate 33 divides the circular space between the outer ring 31 and the inner ring 32 into a plurality of trapezoidal through holes, the trapezoidal through holes are inner air ports 29, and 4 second threaded holes 34 are symmetrically distributed in the outer ring 31.

Middle lid 5 sets up between holding shell 11 and motor housing 1, and middle lid 5, motor housing 1 and holding shell 11 pass through the bolt can dismantle the connection to the direction of user's hand when using is faced towards to the front side 38 of middle lid 5, avoids causing the damage to the user from the exhaust hot-blast in air outlet 30.

The motor 2 further includes a motor output shaft 4, the motor output shaft 4 being disposed within the inner ring 32 and the support tube 35.

As shown in fig. 9, the front cover 13 is composed of a main body 44, a platform 28 and a convex ring 27, the main body 44 is a hollow cylinder, and the platform 28 includes a first platform surface 42 and a second platform surface 43.

As shown in fig. 1, one end of a transmission shaft 8 is detachably connected with a working head 12, the other end of the transmission shaft is detachably connected with a motor output shaft 4, a first bearing 9 and a second bearing 10 are both high-precision bearings, the first bearing 9 and the second bearing 10 are sleeved on two ends of the transmission shaft 8 and are arranged in a pipe sleeve 7, the first bearing 9 is arranged at the front end 25 of the pipe sleeve 7 and is in interference fit with the pipe sleeve 7, a first step 21 is arranged in the pipe sleeve 7, the first bearing 9 is fixedly clamped on the first step 21, and a convex ring 27 is tightly abutted on the first bearing 9; the second bearing 10 is arranged at the tail end 26 of the pipe sleeve 7 and is in interference fit with the pipe sleeve 7, a second step 22 is arranged in the pipe sleeve 7, the second bearing is fixedly clamped on the second step 22, and the support pipe 35 is tightly abutted on the second bearing 10; the pipe sleeve 7 is tightly matched and matched with the front cover 13 and the middle cover 5, the front end 25 of the pipe sleeve 7 is tightly propped against the first platform surface 42 of the platform 28, the top end 19 of the holding shell 11 is tightly propped against the second platform surface 43 of the platform 28, and the tail end 26 of the pipe sleeve 7 is tightly propped against the boss 37.

When the electric grinding tool works, the motor 2 runs at a high speed, the motor fan blade 3 rotates to generate cooling air flow, the motor 2 works for a long time to generate heat, the cooling air flow and the heat pass through the inner air opening 29 of the middle cover 5 to enter the air duct 6 and circulate to the working head 12 along the air duct 6, and a small amount of heat and the cooling air flow pass through the outer air opening 30 of the middle cover 5 to be exhausted into the atmosphere; the motor 2 drives the transmission shaft 8 to run at a high speed, the first bearing shaft 9 and the second bearing 10 which are tightly sleeved on the transmission shaft 8 run at a high speed along with the transmission shaft 8, the first bearing 9 and the second bearing 10 which run at the high speed generate heat, the heat is transferred to the pipe sleeve 7 which is sleeved on the first bearing 9 and the second bearing 10 through heat transfer, the heat transferred to the pipe sleeve 7 exchanges heat with cooling air flow entering the air duct 6, and the cooling air flow carrying the heat is continuously discharged through the air duct opening 16, so that the temperature of a holding part (holding shell) of the electric grinding tool is lower than the long-time working temperature acceptable by a human body.

The utility model discloses a lid in the middle of setting up to cover the interior wind gap and the outer wind gap that set up mutual intercommunication in the middle of, wherein the cooling air current that the interior wind gap produced the motor communicates with the wind channel each other, and the outer wind gap communicates with outside atmosphere, like this the utility model discloses when using more than ambient temperature 30 degrees centigrade, the heat that the long-time work of motor produced carries out the cold and heat exchange with the cooling air current and cools down rapidly in getting into the wind channel through interior wind gap on the one hand, on the other hand also can be discharged into the atmosphere through the outer wind gap with outside atmosphere intercommunication.

The utility model discloses a drive mechanism includes by the transmission shaft, the cover is established at the epaxial protecgulum of transmission, support first bearing and second bearing and the pipe box at transmission shaft both ends, the pipe box cover is established outside the transmission shaft and is located the transmission shaft and grips between the shell, protecgulum and pipe box are closely joined in marriage with first bearing respectively and are joined in marriage, middle lid and pipe box are closely joined in marriage with the second bearing respectively, the weight of instrument has been reduced, drive mechanism's stability and axiality have been improved, effectively prevent that the bearing from running outer lane drunkenness and transmission shaft and beating, the during operation output shaft beats within 0.15mm, and the bearing is the high accuracy, the rotational speed can reach more than 30000 changes, the precision and the.

It should be noted that the above-mentioned preferred embodiments are only for illustrating the technical concepts and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, and the protection scope of the present invention cannot be limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides an electric grinding tool, includes work head (12), holds shell (11), motor housing (1), sets up hold shell (11) with middle lid (5) between motor housing (1), motor (2) and drive mechanism (14) that have motor fan blade (3), its characterized in that: the transmission mechanism (14) comprises a pipe sleeve (7) and a second bearing (10), an air channel (6) is formed between the pipe sleeve (7) and the holding shell (11), and the middle cover (5) is communicated with cooling air flow generated by the motor fan blade (3), the air channel and external atmosphere.

2. The powered abrasive tool of claim 1, wherein: the middle cover (5) comprises an inner tuyere (29) and an outer tuyere (30) which are communicated with each other.

3. The powered abrasive tool of claim 2, wherein: the inner air opening (29) is communicated with the air duct (6) and the cooling air flow.

4. The powered abrasive tool of claim 3, wherein: the intermediate cover (5) comprises an inner ring (32) and an outer ring (31), and the inner tuyere (29) is arranged between the inner ring (32) and the outer ring (31).

5. The powered abrasive tool of claim 4, wherein: the outer tuyere (30) is arranged on the outer ring (31) along the circumferential direction of the outer ring (31).

6. The powered abrasive tool of claim 5, wherein: the external air opening (30) is communicated with the atmosphere.

7. The powered abrasive tool of claim 4, wherein: the intermediate cover (5) further comprises a support tube (35), the support tube (35) being arranged in the sleeve (7) and bearing against the second bearing (10).

8. The powered abrasive tool of claim 7, wherein: the intermediate cover (5) further comprises a boss (37), and the tail end (26) of the pipe sleeve (7) abuts against the boss (37).

9. The powered abrasive tool of claim 7, wherein: the motor (2) comprises a motor output shaft (4), and the motor output shaft (4) is arranged in the inner ring (32) and the supporting tube (35).

10. The powered abrasive tool of claim 2, wherein: the intermediate cover (5) is detachably arranged between the motor housing (1) and the holding housing (11).