CN217530357U

CN217530357U - Flat head angle grinder

Info

Publication number: CN217530357U
Application number: CN202221215966.3U
Authority: CN
Inventors: 秦文刚
Original assignee: Jiangsu Mingwen Tool Technology Co ltd
Current assignee: Jiangsu Mingwen Tool Technology Co ltd
Priority date: 2022-03-11
Filing date: 2022-05-18
Publication date: 2022-10-04
Anticipated expiration: 2032-05-18
Also published as: CN218504163U; CN217572312U; CN114888682A; CN217572313U

Abstract

The utility model discloses a flat head angle mill, include: the machine body shell comprises a motor installation cavity; the motor is arranged in the motor installation cavity and comprises a motor output shaft; the transmission assembly shell comprises a transmission cavity, and the transmission cavity is communicated with the motor installation cavity; the transmission subassembly, the transmission subassembly is located the transmission chamber, the transmission subassembly includes: a first drive shaft; the first transmission wheel is sleeved at one end, far away from the motor, of the first transmission shaft; the second driving wheel is meshed with the first driving wheel; one end of the grinding wheel shaft is connected with the second driving wheel; and the grinding wheel is connected with one end, far away from the second driving wheel, of the grinding wheel shaft. The utility model provides a current angle grinder's emery wheel be not convenient for stretch into the problem of carrying out the operation in long and narrow operational environment.

Description

Flat head angle grinder

Technical Field

The utility model relates to an electronic technical field that polishes especially relates to a flat head angle mill.

Background

An angle grinder, also called a grinder or a disc grinder, is a grinding tool for cutting and grinding glass fiber reinforced plastics. An angle grinder is a portable electric tool for cutting and grinding glass fiber reinforced plastics, and is mainly used for cutting, grinding and brushing metal, stone and the like.

An electric angle grinder is a machine for grinding, cutting, derusting and polishing metal members by using a sheet grinding wheel, a rubber grinding wheel, a wire wheel and the like which rotate at a high speed. The angle grinder is suitable for cutting, grinding and brushing metal and stone, and water is not used during operation. Guide plates must be used when cutting stone. Grinding and polishing operations can also be performed for models equipped with electronic control devices, if appropriate accessories are installed on such machines. The transmission structure of the existing angle grinder is wide, and the grinding wheel is not convenient to extend into a long and narrow working environment for operation.

SUMMERY OF THE UTILITY MODEL

Therefore, the embodiment of the utility model provides a flat head angle mill, the emery wheel of effectively solving current angle mill is not convenient for stretch into the problem of carrying out the operation in long and narrow operational environment.

The embodiment of the utility model provides a pair of flat head angle mill, include: the machine body shell comprises a motor installation cavity; the motor is arranged in the motor installation cavity and comprises a motor output shaft; the transmission assembly shell comprises a transmission cavity, and the transmission cavity is communicated with the motor installation cavity; the transmission subassembly, the transmission subassembly is located the transmission chamber, the transmission subassembly includes: a first drive shaft; the first transmission wheel is sleeved at one end, far away from the motor, of the first transmission shaft; the second transmission wheel is meshed with the first transmission wheel; one end of the grinding wheel shaft is connected with the second driving wheel; and the grinding wheel is connected with one end of the grinding wheel shaft, which is far away from the second driving wheel.

Compared with the prior art, the technical effect achieved after the technical scheme is adopted is as follows: the first transmission shaft transmits power to the grinding wheel through the first transmission wheel and the second transmission wheel so as to control the grinding wheel to rotate; an included angle can be formed between the first driving wheel and the second driving wheel, so that the direction of the grinding wheel shaft is different from that of the first driving shaft, and the grinding wheel can conveniently stretch into a long and narrow working environment to operate.

Further, the flat head angle grinder further comprises: the locking assembly comprises a locking hole, a locking shaft and a first elastic piece, the locking hole is formed in the machine body shell or the transmission assembly shell, the first elastic piece is sleeved on the locking shaft and abutted to the locking Kong Zhouce, and the locking shaft penetrates through the locking hole and is locked with the motor output shaft or the first transmission shaft.

The technical effect achieved after the technical scheme is adopted is as follows: one end of the locking shaft is positioned outside the transmission assembly shell, and a user can press the locking shaft to enable the other end of the locking shaft to be matched with the first transmission shaft or the motor output shaft, so that the first transmission shaft or the motor output shaft is locked; the first elastic piece can push the locking shaft to rebound when a user releases the locking shaft, so that the first transmission shaft or the motor output shaft is unlocked; after the first transmission shaft or the motor output shaft is locked by the locking shaft, the grinding wheel stops rotating immediately, and the locking shaft cannot be subjected to torsional force in other directions subsequently, so that the locking assembly is not easy to damage, and the service life of the locking assembly is prolonged.

Further, the locking shaft comprises a locking shaft body and a first limiting piece, and the first limiting piece is connected with one end, extending out of the locking hole, of the locking shaft body; one end of the first elastic piece, which is far away from the locking hole, abuts against the first limiting piece.

The technical effect achieved after the technical scheme is adopted is as follows: the first limiting part limits one end of the first elastic part, and one end, far away from the transmission assembly shell, of the first elastic part is prevented from being separated from the locking shaft.

Further, the locking assembly further comprises: the second limiting piece is clamped at one end, extending into the locking hole, of the locking shaft body; and the limiting groove is formed in the locking shaft body and matched with the second limiting part.

The technical effect achieved after the technical scheme is adopted is as follows: the second limiting part is used for limiting the other end of the locking shaft. When a user presses the locking shaft, the first limiting piece pushes the first elastic piece to compress, and the second limiting piece is separated from the inner wall of the transmission assembly shell and moves towards the first transmission shaft along with the inward end of the locking shaft; when the user loosens when the locking axle, first elastic component extends to promote first elastic component removes to the direction of keeping away from the drive assembly casing, simultaneously, the second locating part to the inner wall of drive assembly casing removes, until the second locating part with when the inner wall butt of drive assembly casing first elastic component stops to extend, thereby plays limiting displacement to first elastic component.

Further, the transmission assembly further comprises a grinding wheel shaft shell, and the grinding wheel shaft shell is sleeved on the grinding wheel shaft; the flat head angle grinder further comprises: the grinding wheel cover is sleeved on one side of the grinding wheel and is in rotating connection with the grinding wheel shaft shell, and the grinding wheel cover is arranged opposite to the transmission assembly shell; the positioning mechanism is arranged between the grinding wheel cover and the transmission assembly shell.

The technical effect achieved after the technical scheme is adopted is as follows: the grinding wheel cover is used for blocking chips generated by grinding, and is adjusted according to the chip generation direction, so that the chips are prevented from affecting users; the positioning assembly is used for positioning and locking the rotating angle of the grinding wheel cover, so that the angle of the grinding wheel cover is prevented from being changed due to vibration in the actual use process.

Further, the positioning mechanism includes: the positioning bracket is connected with the transmission assembly shell and provided with a positioning piece moving hole which penetrates through the positioning bracket, and the positioning piece moving hole extends to the transmission assembly shell; the positioning piece is arranged at one end, facing the grinding wheel cover, of the positioning piece moving hole; the second elastic piece is positioned in the positioning piece moving hole and is abutted between the positioning piece and the transmission component shell; the positioning grooves are formed in one side, corresponding to the positioning piece moving holes, of the grinding wheel cover and are arranged around the grinding wheel shaft; the positioning piece can be matched with the positioning groove under the pushing of the second elastic piece.

The technical effect achieved after the technical scheme is adopted is as follows: the positioning bracket is used for limiting the movement range of the positioning piece and the second elastic piece; when the grinding wheel cover rotates to a proper angle, the positioning groove corresponds to the positioning piece in the vertical direction under the angle, and the second elastic piece pushes the positioning piece into the positioning groove, so that the circumferential locking of the grinding wheel cover is realized.

Further, the ratio of the distance L1 from one end of the machine body shell close to the transmission assembly shell to the axis of the grinding wheel shaft to the diameter L2 of the motor is H; wherein, the value range of H is as follows: h is more than or equal to 1 and less than or equal to 2.5.

The technical effect achieved after the technical scheme is adopted is as follows: the outer contour of the transmission assembly shell of the flat-head angle grinder is lengthened, and the integral installation structure of the flat-head angle grinder is more compact and reasonable while operation in a narrow space is met.

Furthermore, the transmission assembly comprises a plurality of bearings, and the plurality of bearings are sleeved on the first transmission shaft and are matched with the transmission assembly shell; the outer diameters of the bearings are sequentially reduced along the direction that the first transmission shaft is far away from the motor; and a plurality of step surfaces corresponding to the bearings are formed at the top of the transmission assembly shell.

The technical effect achieved after the technical scheme is adopted is as follows: the top of the transmission assembly shell is provided with a plurality of step surfaces, so that the transmission assembly shell is matched with the bearing more tightly, and the integral structural strength is improved; meanwhile, along the direction that the first transmission shaft is far away from the motor, the outer diameters of the bearings are sequentially reduced, and the flat-head angle grinder is convenient to grind in various complex environments, such as in narrow space.

Further, the transmission assembly further comprises: the heat dissipation through hole is formed in the lower surface of the transmission component shell and close to one side of the machine body shell, and the heat dissipation through hole is communicated with the inner cavity of the machine body shell.

The technical effect achieved after the technical scheme is adopted is as follows: the heat dissipation through-hole is convenient for the drive assembly casing with heat in the fuselage casing volatilizees to the outside, improves the radiating efficiency, avoids the motor with drive assembly influences transmission efficiency because the temperature is too high in the course of the work.

Further, the flat-head angle grinder further comprises: and the flexible coupling is sleeved between the first transmission shaft and the motor output shaft.

The technical effect achieved after the technical scheme is adopted is as follows: the flexible coupling is in transmission connection between the transmission assembly and the output shaft of the motor so as to transmit the power of the output shaft of the motor to the transmission assembly and realize transmission; meanwhile, in the working process of the flat-head angle grinder, the flexible coupler can reduce the influence of vibration on the motor.

In summary, the above embodiments of the present application may have one or more of the following advantages or benefits: i) A user can press the locking shaft to enable the other end of the locking shaft to be matched with the first transmission shaft or the motor output shaft, so that the first transmission shaft or the motor output shaft is locked; the first elastic piece can push the locking shaft to rebound when a user releases the locking shaft, so that the first transmission shaft or the motor output shaft is unlocked; i i) after the locking shaft locks the first transmission shaft or the motor output shaft, the grinding wheel stops rotating immediately, and the locking shaft cannot be subjected to torsional force in other directions subsequently, so that the locking assembly is not easy to damage, and the service life of the locking assembly is prolonged; i ii) the first drive shaft transmits power to the grinding wheel through the first drive wheel and the second drive wheel, thereby controlling rotation of the grinding wheel; an included angle can be formed between the first transmission wheel and the second transmission wheel, so that the direction of the grinding wheel shaft is different from that of the first transmission shaft, and the grinding wheel can conveniently extend into a long and narrow working environment to operate; iv) when the grinding wheel cover rotates to a proper angle, the positioning groove corresponding to the angle corresponds to the positioning piece in the vertical direction, and the second elastic piece pushes the positioning piece into the positioning groove, so that the circumferential locking of the grinding wheel cover is realized; v) the top of the transmission assembly shell is provided with a plurality of step surfaces, so that the transmission assembly shell is matched with the bearing more tightly, and the integral structural strength is improved; meanwhile, along the direction that the first transmission shaft is far away from the motor, the outer diameters of the bearings are sequentially reduced, and the flat-head angle grinder is convenient to grind in various complex environments, such as in narrow space.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a flat head angle grinder according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of the flat head angle grinder in fig. 1.

Fig. 3 is an exploded view of the locking element of fig. 2.

Fig. 4 is a schematic view of the connection of the motor and transmission assembly of fig. 2.

FIG. 5 is a schematic view of the flat-head angle grinder of FIG. 1 from another perspective.

Fig. 6 isbase:Sub>A sectional view in the directionbase:Sub>A-base:Sub>A of fig. 5.

FIG. 7 is the drawing I in FIG. 6 an enlargement of the area.

Fig. 8 is a schematic structural view of a transmission assembly housing.

Description of the main element symbols:

100 is a flat head angle grinder; 110 is a fuselage shell; 111 is a motor mounting cavity; 120 is a motor; 121 is a motor output shaft; 122 is a flexible coupling; 130 is a transmission component shell; 131 is a first step surface; 132 is a second step surface; numeral 133 denotes a third step surface; 134 is a heat dissipation through hole; 135 is a transmission cavity; 136 is a flange member; 140 is a transmission assembly; 141 is a first transmission shaft; 142 is a first driving wheel; 143 is a second driving wheel; 144 is a grinding wheel shaft; 145 is a first bearing; 146 is a second bearing; 147 is a first sleeve; 148 is a second shaft sleeve; 149 is a third sleeve; 150 is a grinding wheel; 151 is grinding wheel shaft shell; 152 is a grinding wheel cover; 153 is a positioning mechanism; 154 is a positioning bracket; 155 is a positioning piece moving hole; 156 is a locating element; 157 is a second elastic member; 158 is a positioning groove; 160 is a locking assembly; 161 is a locking hole; 162 is a locking shaft; 162a is a first limiting member; 163 is a first elastic member; 164 is a second limiting member; 165 is a limit groove; 170 is a handle.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 8, a flat head angle grinder 100 according to an embodiment of the present invention includes: a body housing 110, a motor 120, a drive assembly housing 130, a drive assembly 140, a grinding wheel 150, and a locking assembly 160. Wherein, the body housing 110 includes a motor installation cavity 111; the motor 120 is arranged in the motor mounting cavity 111, and the motor 120 comprises a motor output shaft 121; the transmission assembly housing 130 comprises a transmission cavity 135, and the transmission cavity 135 is communicated with the motor installation cavity 111; drive assembly 140 is located drive chamber 135, and drive assembly 140 includes: a first transmission shaft 141; the first driving wheel 142, the first driving wheel 142 is sleeved on one end of the first transmission shaft 141 far away from the motor 120; a second transmission wheel 143, the second transmission wheel 143 is meshed with the first transmission wheel 142; a grinding wheel shaft 144, wherein one end of the grinding wheel shaft 144 is connected with a second driving wheel 143; and a grinding wheel, a grinding wheel 150 is connected with one end of the grinding wheel shaft 144 far away from the second transmission wheel 143.

In the present embodiment, the first transmission shaft 141 transmits power to the grinding wheel 150 through the first transmission wheel 142 and the second transmission wheel 143, thereby controlling the grinding wheel 150 to rotate; an angle is formed between the first driving wheel 142 and the second driving wheel 143, so that the direction of the grinding wheel shaft 144 is different from that of the first driving shaft 141, and the grinding wheel 150 can conveniently extend into a long and narrow working environment for operation.

Preferably, the first driving wheel 142 and the second driving wheel 143 are perpendicular to each other, so that the grinding wheel shaft 144 is perpendicular to the first driving shaft 141, and accordingly, the grinding wheel 150 is parallel to the first driving shaft 141, so that the grinding wheel 150 can perform the best cutting effect when the flat-head angle grinder 100 is advanced to work. For example, the first driving wheel 142 and the second driving wheel 143 may be bevel gears engaged with each other, which is not limited herein.

In a specific embodiment, the flat-head angle grinder 100 further includes, for example, a locking assembly 160 including a locking hole 161, a locking shaft 162, and a first elastic member 163, wherein the locking hole 161 is opened in the body housing 110 or the transmission assembly housing 130, the first elastic member 163 is sleeved on the locking shaft 162 and abuts against the periphery of the locking hole 161, and the locking shaft 162 passes through the locking hole 161 and locks the motor output shaft 121 or the first transmission shaft 141.

One end of the locking shaft 162 is located outside the transmission assembly housing 130, so that a user can conveniently press the locking shaft 162, and after the locking shaft 162 is pressed, the other end of the locking shaft 162 can be matched with the first transmission shaft 141 or the motor output shaft 121, so as to lock the first transmission shaft 141 or the motor output shaft 121; the first elastic member 163 may push the locking shaft 162 to rebound when the user releases the locking shaft 162, so as to unlock the first transmission shaft 141 or the motor output shaft 121; after the locking shaft 162 locks the first transmission shaft 141 or the motor output shaft 121, the grinding wheel 150 stops rotating immediately, and the locking shaft 162 cannot be subjected to torsional force in other directions subsequently, so that the locking assembly 160 is not easy to damage, and the service life of the locking assembly 160 is prolonged.

In a specific embodiment, the locking shaft 162 includes, for example, a locking shaft body and a first stopper 162a, wherein the first stopper 162a is connected to one end of the locking shaft body extending out of the locking hole 161; one end of the first elastic element 163, which is far away from the locking hole 161, abuts against the first limiting element 162a. For example, the diameter of the first position-limiting element 162a is greater than the diameter of the locking shaft body, so that the bottom of the first position-limiting element 162a forms a connecting surface surrounding the locking shaft body, and is used for limiting an end of the first elastic element 163 of the locking shaft 162, and preventing an end of the first elastic element 163 away from the transmission assembly housing 130 from being separated from the locking shaft 162.

The first limiting member 162a and the locking shaft 162 may be connected by a screw connection, a pin connection, or the like, or the first limiting member 162a and the locking shaft 162 may be an integrated structure, which is not limited herein.

In a particular embodiment, the locking assembly 160 further comprises: the second limiting piece 164, the second limiting piece 164 is clamped at one end of the locking shaft body extending into the locking hole 161; and the limiting groove 165 is formed in the locking shaft body, and the limiting groove 165 is matched with the second limiting piece 164. The second limiting member 164 is used for limiting the other end of the locking shaft 162.

For example, the limiting groove 165 surrounds the locking shaft body, the second limiting member 164 is a split ring, and after the second limiting member 164 is installed in the limiting groove 165, the second limiting member can be engaged with the inner wall of the transmission assembly housing 130 to prevent the locking shaft body from being separated from the locking hole 161, and at the same time, the distance from the first limiting member 162a to the outer wall of the transmission assembly housing 130 is also limited, so as to limit the maximum length of the first elastic member 163.

Specifically, when the user presses the locking shaft 162, the first limiting member 162a pushes the first elastic member 163 to compress, and the second limiting member 164 is separated from the inner wall of the transmission housing 130 and moves toward the first transmission shaft 141 along with the inward end of the locking shaft 162; when the user releases the locking shaft 162, the first elastic member 163 extends, and pushes the first elastic member 163 to move in a direction away from the transmission housing 130, and meanwhile, the second limiting member 164 moves towards the inner wall of the transmission housing 130, until the first elastic member 163 stops extending when the second limiting member 164 abuts against the inner wall of the transmission housing 130.

In one specific embodiment, the transmission assembly 140 includes, for example, a first shaft sleeve 147, and the first shaft sleeve 147 is sleeved on the first transmission shaft 141 and corresponds to an axial position of the locking assembly 160 on the first transmission shaft 141. Wherein a plurality of locking grooves open circumferentially to the first hub 147 such that the locking assembly 160 can lock at a plurality of points on the first transmission shaft 141. The number of the locking grooves is, for example, 3, 4, 5, which is not limited herein.

In a specific embodiment, one end of the grinding wheel shaft 144 corresponding to the second driving wheel 143 extends out of the second driving wheel 143, and the driving assembly housing 130 is provided with a corresponding shaft hole to be sleeved with the end of the grinding wheel shaft 144, so as to improve the stability of the grinding wheel shaft 144.

In one embodiment, the transmission assembly 140 further includes a grinding wheel shaft housing 151, the grinding wheel shaft housing 151 is disposed on the grinding wheel shaft 144; the flat-head angle grinder 100 further includes: the grinding wheel cover 152 is sleeved on one side of the grinding wheel 150 and is rotatably connected with the grinding wheel shaft shell 151, and the grinding wheel cover 152 is arranged opposite to the transmission assembly shell 130; the positioning mechanism 153 is disposed between the grinding wheel housing 152 and the transmission assembly housing 130. The grinding wheel cover 152 is used for blocking chips generated by grinding, and the grinding wheel cover 152 is adjusted according to the direction of the generated chips, so that the chips can be prevented from affecting users; the positioning assembly is used for positioning and locking the rotation angle of the grinding wheel housing 152, so that the grinding wheel housing 152 is prevented from changing the angle due to vibration in the actual use process.

Preferably, the inner cavity of the grinding wheel spindle housing 151 communicates with the inner cavity of the transmission assembly housing 130, and a gear groove is formed at the inner top of the grinding wheel spindle housing 151 for accommodating the second transmission wheel 143.

Furthermore, a first bearing 145 is sleeved on the outer side of the second transmission wheel 143, and the first bearing 145 is clamped in the grinding wheel shaft housing 151, so that the second transmission wheel 143 can rotate more stably.

In a particular embodiment, the transmission assembly 140 further comprises, for example: the second shaft sleeve 148 and the third shaft sleeve 149, wherein the second shaft sleeve 148 and the third shaft sleeve 149 are clamped at two opposite sides of the grinding wheel 150, so that the firmness of the grinding wheel 150 is improved; and the second shaft sleeve 148 and the third shaft sleeve 149 are sleeved and fixed on the grinding wheel shaft 144, and the second shaft sleeve 148 and the third shaft sleeve 149 rotate with the grinding wheel shaft 144, so that the grinding wheel 150 can also stably rotate with the grinding wheel shaft 144. The second shaft sleeve 148 and the third shaft sleeve 149 may be disc structures, which are not limited herein.

Preferably, the side of the second bushing 148 opposite to the third bushing 149, and/or the side of the third bushing 149 opposite to the second bushing 148, is provided with a supporting step, for example, on which the inner diameter of the grinding wheel 150 is greater than the diameter of the grinding wheel shaft 144 and on which the inner side of the grinding wheel 150 is fitted, avoiding contact between the grinding wheel 150 and the grinding wheel shaft 144, resulting in the grinding wheel shaft 144 being worn down by the grinding wheel 150 for a long period of time; also, the mounting of the grinding wheel 150 between the second bushing 148 and the third bushing 149 facilitates the removal of the grinding wheel 150.

In one particular embodiment, the positioning mechanism 153 includes, for example: the positioning bracket 154 is connected with the transmission assembly shell 130, the positioning bracket 154 is provided with a positioning piece moving hole 155 which penetrates through, and the positioning piece moving hole 155 extends to the transmission assembly shell 130; a positioning member 156 disposed at one end of the positioning member moving hole 155 facing the grinding wheel housing 152; the second elastic element 157 is located in the positioning element moving hole 155 and abuts between the positioning element 156 and the transmission assembly housing 130. The positioning bracket 154 is used for limiting the movement range of the positioning member 156 and the second elastic member 157, and the second elastic member 157 extends and contracts in the positioning member movement hole 155 and applies a pushing force to the positioning member 156 in a direction perpendicular to the top surface of the grinding wheel housing 152, so that the positioning member 156 and the grinding wheel housing 152 are pressed, the grinding wheel housing 152 can be fixed at a current angle, and the grinding wheel housing 152 cannot be loosened during the operation of the flat-head angle grinder 100.

Preferably, the opposite sides of the positioning bracket 154 are coupled to the drive assembly housing 130 by fasteners such as screws, thereby improving the stability of the positioning bracket 154 and, correspondingly, the connection between the positioning member 156 and the grinding wheel housing 152 is more stable.

In a specific embodiment, the positioning mechanism 153 further includes, for example: a plurality of positioning grooves 158 formed on the side of the grinding wheel housing 152 corresponding to the positioning member moving holes 155 and arranged around the grinding wheel shaft 144; the positioning member 156 can be engaged with the positioning groove 158 by being pushed by the second elastic member 157. For example, the positioning member 156 is a spherical structure, and the positioning slot 158 is an arc-shaped slot, so that the positioning member 156 can smoothly fit with the positioning slot 158 even if it rotates under the urging of the second elastic member 157.

It should be noted that, when the grinding wheel housing 152 rotates to a proper angle, the lower positioning groove 158 at the angle corresponds to the positioning element 156 in the vertical direction, and the second elastic element 157 pushes the positioning element 156 into the positioning groove 158, so as to achieve circumferential locking of the grinding wheel housing 152.

In a specific embodiment, the ratio of the distance L1 from the end of the body housing 110 near the transmission assembly housing 130 to the axis of the grinding wheel shaft 144 to the diameter L2 of the motor 120 is H; wherein, the value range of H is as follows: 1.H.ltoreq.2.5, for example 1.32 H.ltoreq.1.42. Under this ratio, the outer contour of the transmission assembly housing 130 of the flat-head angle grinder 100 is longer, and the whole installation structure of the flat-head angle grinder 100 is more compact and reasonable while the operation in a narrow space is satisfied.

In one embodiment, the transmission assembly 140 includes a plurality of bearings, and the plurality of bearings are sleeved on the first transmission shaft 141 and are engaged with the transmission assembly housing 130, so as to improve the stability of the first transmission shaft 141. For example, the transmission assembly 140 includes a first bearing 145 and a second bearing 146, and the first transmission shaft 141 includes a plurality of shaft segments with different diameters, wherein the diameter of the first shaft segment located at the middle position of the first transmission shaft 141 is the largest, and the first bearing 145 and the second bearing 146 are clamped on the front and rear sides of the first shaft segment in the axial direction, so as to further improve the stability of the first transmission shaft 141.

Preferably, the outer diameters of the plurality of bearings decrease in sequence in a direction in which the first transmission shaft 141 is away from the motor 120, for example, the first bearing 145 is located on a side of the second bearing 146 away from the motor 120, and the outer diameter of the first bearing 145 is smaller than the outer diameter of the second bearing 146. Further, the top of the transmission assembly housing 130 is formed with a plurality of stepped surfaces corresponding to the plurality of bearings. The top of the transmission assembly shell 130 is provided with a plurality of step surfaces, and on the basis of ensuring that the thickness of the transmission assembly shell 130 is not obviously changed, the transmission assembly shell 130 is more tightly matched with a bearing by the plurality of step surfaces, so that the integral structural strength is improved; meanwhile, the outer diameters of the plurality of bearings are sequentially reduced in a direction in which the first transmission shaft 141 is far away from the motor 120, which facilitates the flat-head angle grinder 100 to perform grinding operations in various complicated environments, such as in a narrow space.

Preferably, the plurality of step surfaces include, for example: a first step surface 131, a second step surface 132, and a third step surface 133; the first stepped surface 131 corresponds to the locking assembly 160, the second stepped surface 132 corresponds to the first bearing 145, the second bearing 146 corresponds to the middle position between the first stepped surface 131 and the second stepped surface 132, and one end of the grinding wheel shaft 144, which is far away from the grinding wheel 150, corresponds to the third stepped surface 133.

Further, the distance from the first stepped surface 131 to the axis of the first transmission shaft 141 is h1, the distance from the second stepped surface 132 to the axis of the first transmission shaft 141 is h2, and the distance from the third stepped surface 133 to the axis of the first transmission shaft 141 is h3, wherein h1: h2: h3= 5-6. For example, h1: h2: h3= 6.

In a particular embodiment, the transmission assembly 140 further comprises, for example: and the heat dissipation through hole 134 is formed in the lower surface of the transmission assembly housing 130, which is close to one side of the body housing 110, and the heat dissipation through hole 134 is communicated with the inner cavity of the body housing 110. For example, the transmission housing 130 includes a flange member 136, the flange member 136 is adjacent to the body housing 110, wherein the flange member 136 has a flange surface, and the transmission housing 130 is connected to the housing of the motor 120 through a fastening member and a fixing hole on the flange surface; the heat dissipation through hole 134 is formed in the flange surface, so that heat in the transmission assembly housing 130 and the machine body housing 110 can be conveniently volatilized to the outside, the heat dissipation efficiency is improved, and the influence of overhigh temperature on the transmission efficiency in the working process of the motor 120 and the transmission assembly 140 is avoided.

Preferably, the heat dissipating through holes 134 are, for example, a plurality of strip-shaped holes arranged in parallel, and are not limited herein.

In a particular embodiment, the flat-head angle grinder 100, for example, further includes: the flexible coupling 122 is sleeved between the first transmission shaft 141 and the motor output shaft 121. The flexible coupling 122 is in transmission connection between the transmission assembly 140 and the motor output shaft 121, so that the power of the motor output shaft 121 is transmitted to the transmission assembly 140, and transmission is realized. Meanwhile, the flexible coupling 122 can reduce vibration during the operation of the flat-head angle grinder 100.

In a particular embodiment, the flat-head angle grinder 100 further includes, for example: the handle 170 is vertically connected to one side of the transmission housing 130, and is used for holding the flat-head angle grinder 100 and facilitating pushing the flat-head angle grinder 100 to operate.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A flat-head angle grinder, comprising:

a body housing (110) including a motor installation cavity (111);

the motor (120) is arranged in the motor mounting cavity (111), and the motor (120) comprises a motor output shaft (121);

a transmission assembly housing (130) comprising a transmission cavity (135), wherein the transmission cavity (135) is communicated with the motor installation cavity (111);

a drive assembly (140), the drive assembly (140) disposed in the drive cavity (135), the drive assembly (140) comprising: a first transmission shaft (141); the first transmission wheel (142), the first transmission wheel (142) is sleeved at one end of the first transmission shaft (141) far away from the motor (120); a second transmission wheel (143), the second transmission wheel (143) being engaged with the first transmission wheel (142); one end of the grinding wheel shaft (144) is connected with the second transmission wheel (143);

a grinding wheel (150), wherein the grinding wheel (150) is connected with one end of the grinding wheel shaft (144) far away from the second driving wheel (143).

2. The flat-head angle grinder of claim 1, further comprising: locking subassembly (160), including locking hole (161), locking axle (162) and first elastic component (163), locking hole (161) set up in fuselage casing (110) or transmission unit casing (130), first elastic component (163) cover is located locking axle (162) and butt in locking hole (161) week side, locking axle (162) pass locking hole (161) and lock motor output shaft (121) or first transmission shaft (141).

3. The flat head angle grinder of claim 2, wherein the locking shaft (162) includes a locking shaft body and a first stopper (162 a), the first stopper (162 a) connecting one end of the locking shaft body protruding out of the locking hole (161);

one end of the first elastic piece (163) far away from the locking hole (161) abuts against the first limiting piece (162 a).

4. The flat-head angle grinder of claim 3, wherein the locking assembly (160) further comprises:

the second limiting piece (164), the second limiting piece (164) is clamped at one end of the locking shaft body extending into the locking hole (161);

the limiting groove (165) is formed in the locking shaft body, and is matched with the second limiting part (164).

5. The flat-head angle mill of claim 4, further comprising:

the grinding wheel shaft shell (151), the grinding wheel shaft shell (151) is sleeved on the grinding wheel shaft (144);

the grinding wheel cover (152) is sleeved on one side of the grinding wheel (150) and is in rotating connection with the grinding wheel shaft shell (151), and the grinding wheel cover (152) is opposite to the transmission assembly shell (130);

a positioning mechanism (153), the positioning mechanism (153) being disposed between the grinding wheel cover (152) and the transmission assembly housing (130).

6. The flat-head angle grinder of claim 5, wherein the positioning mechanism (153) comprises:

the positioning bracket (154) is connected with the transmission assembly shell (130), the positioning bracket (154) is provided with a positioning piece moving hole (155) which penetrates through the positioning piece moving hole, and the positioning piece moving hole (155) extends to the transmission assembly shell (130);

the positioning piece (156) is arranged at one end, facing the grinding wheel cover (152), of the positioning piece moving hole (155);

the second elastic piece (157) is positioned in the positioning piece moving hole (155) and is abutted between the positioning piece (156) and the transmission component shell (130);

a plurality of positioning grooves (158) which are arranged on one side of the grinding wheel cover (152) corresponding to the positioning piece moving holes (155) and surround the grinding wheel shaft (144); the positioning piece (156) can be matched with the positioning groove (158) under the pushing of the second elastic piece (157).

7. The flat-head angle grinder of claim 4,

the ratio of the distance L1 from one end of the machine body shell (110) close to the transmission assembly shell (130) to the axis of the grinding wheel shaft (144) to the diameter L2 of the motor (120) is H;

wherein, the value range of H is as follows: h is more than or equal to 1 and less than or equal to 2.5.

8. The flat head angle grinder of any of claims 1-7, characterized in that the transmission assembly (140) comprises a plurality of bearings, which are sleeved on the first transmission shaft (141) and cooperate with the transmission assembly housing (130);

wherein the outer diameters of the plurality of bearings are sequentially reduced in a direction in which the first transmission shaft (141) is away from the motor (120); the top of the transmission assembly shell (130) forms a plurality of step surfaces corresponding to the plurality of bearings.

9. The flat-head angle grinder of any of claims 1-7, characterized in that the transmission assembly (140) further comprises:

the heat dissipation through hole (134) is arranged on the lower surface of the transmission component shell (130) and close to one side of the machine body shell (110), and the heat dissipation through hole (134) is communicated with the inner cavity of the machine body shell (110).

10. The flat-head angle grinder of any one of claims 1 to 7, further comprising:

and the flexible coupling (122) is sleeved between the first transmission shaft (141) and the motor output shaft (121).