A flat head angle grinder

Abstract

The application discloses a flat head angle grinder, which comprises a machine body shell, a motor, a transmission assembly shell and a transmission assembly. The machine body shell comprises a motor mounting cavity. The motor is arranged in the motor mounting cavity and comprises a motor output shaft. The transmission assembly shell comprises a transmission cavity, and the transmission cavity is communicated with the motor mounting cavity. The transmission assembly is arranged in the transmission cavity and comprises a first transmission shaft, a first transmission wheel, a second transmission wheel and a grinding wheel shaft. The first transmission wheel is sleeved on one end of the first transmission shaft away from the motor. The second transmission wheel is engaged with the first transmission wheel. The grinding wheel shaft is connected with the second transmission wheel at one end. The grinding wheel is connected with one end of the grinding wheel shaft away from the second transmission wheel. The application solves the problem that the grinding wheel of the existing angle grinder is inconvenient to work in a narrow and long working environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric grinding, in particular to a flat head angle grinder. BACKGROUND

[0002] The angle grinder, also known as a grinder or disc grinder, is a kind of grinding tool for glass steel cutting and grinding. The angle grinder is a handheld electric tool for cutting, grinding and brushing metal and stone materials.

[0003] The electric angle grinder is used for grinding, cutting, rust removal and polishing of metal components by using high-speed rotating thin piece grinding wheel and rubber grinding wheel, steel wire wheel, etc. The angle grinder is suitable for cutting, grinding and brushing metal and stone materials, and water cannot be used during operation. When cutting stone materials, a guide plate must be used. For the models equipped with electronic control devices, if appropriate accessories are installed on such machines, grinding and polishing operations can also be performed. The existing angle grinder has a wide transmission structure, and the grinding wheel is not convenient to extend into a narrow working environment for operation. SUMMARY

[0004] Therefore, the present application provides a flat head angle grinder, which effectively solves the problem that the grinding wheel of the existing angle grinder is not convenient to extend into a narrow working environment for operation.

[0005] The flat head angle grinder provided by the present application comprises a machine body shell comprising a motor mounting cavity, a motor arranged in the motor mounting cavity, the motor comprising a motor output shaft, a transmission assembly shell comprising a transmission cavity, the transmission cavity being communicated with the motor mounting cavity, and a transmission assembly arranged in the transmission cavity, the transmission assembly comprising a first transmission shaft, a first transmission wheel sleeved on one end of the first transmission shaft away from the motor, a second transmission wheel engaged with the first transmission wheel, a grinding wheel shaft connected to one end of the second transmission wheel, and a grinding wheel connected to one end of the grinding wheel shaft away from the second transmission wheel.

[0006] Compared with the prior art, the technical effects achieved after adopting the technical scheme are 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 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 is convenient to extend into a narrow working environment for operation.

[0007] Further, the flat head angle grinder further comprises a locking assembly, comprising a locking hole, a locking shaft and a first elastic member, the locking hole is arranged on the machine body shell or the transmission assembly shell, the first elastic member is sleeved on the locking shaft and abuts against the locking hole, the locking shaft passes through the locking hole and locks the motor output shaft or the first transmission shaft.

[0008] After the technical scheme is adopted, the following technical effects are achieved: one end of the locking shaft is located outside the transmission assembly shell, the user presses the locking shaft to make the other end of the locking shaft cooperate with the first transmission shaft or the motor output shaft, thereby locking the first transmission shaft or the motor output shaft; the first elastic member can push the locking shaft to rebound when the user releases the locking shaft, thereby unlocking the first transmission shaft or the motor output shaft; after the locking shaft locks the first transmission shaft or the motor output shaft, the grinding wheel stops rotating, the locking shaft will not be subjected to a torsional force in other directions subsequently, and therefore the locking assembly is not easy to be damaged, thereby prolonging the service life of the locking assembly.

[0009] Further, the locking shaft comprises a locking shaft body and a first limiting member, the first limiting member is connected to one end of the locking shaft body that extends out of the locking hole.

[0010] After the technical scheme is adopted, the following technical effects are achieved: the first limiting member limits one end of the first elastic member, thereby avoiding the end of the first elastic member that is far away from the transmission assembly shell from being separated from the locking shaft.

[0011] Further, the locking assembly further comprises a second limiting member, the second limiting member is clamped on one end of the locking shaft body that extends into the locking hole; and a limiting groove, the limiting groove is arranged on the locking shaft body and cooperates with the second limiting member.

[0012] After the technical scheme is adopted, the following technical effects are achieved: the second limiting member is used to limit the other end of the locking shaft. When the user presses the locking shaft, the first limiting member pushes the first elastic member to compress, the second limiting member is separated from the inner wall of the transmission assembly shell and moves towards the first transmission shaft along the end of the locking shaft that faces inward; when the user releases the locking shaft, the first elastic member extends and pushes the first elastic member to move away from the transmission assembly shell, at the same time, the second limiting member moves towards the inner wall of the transmission assembly shell, until the first elastic member stops extending when the second limiting member abuts against the inner wall of the transmission assembly shell, thereby limiting the first elastic member.

[0013] Further, the transmission assembly further comprises a grinding wheel shaft housing, the grinding wheel shaft housing is sleeved on the grinding wheel shaft; the flat head angle grinder further comprises a grinding wheel cover and a positioning mechanism, the grinding wheel cover is sleeved on one side of the grinding wheel and is rotationally connected with the grinding wheel shaft housing, and the grinding wheel cover is arranged opposite to the transmission assembly housing; the positioning mechanism is arranged between the grinding wheel cover and the transmission assembly housing.

[0014] After the technical scheme is adopted, the following technical effects are achieved: the grinding wheel cover is used for blocking the debris generated by grinding, the grinding wheel cover is adjusted according to the direction of the debris, and the user is prevented from being affected by the debris; the positioning assembly is used for positioning and locking the angle of rotation of the grinding wheel cover, and the angle of the grinding wheel cover is prevented from being changed due to vibration in actual use.

[0015] Further, the positioning mechanism comprises a positioning support connected with the transmission assembly housing, the positioning support is provided with a positioning member movement hole extending to the transmission assembly housing, a positioning member is arranged at one end of the positioning member movement hole facing the grinding wheel cover, a second elastic member is arranged in the positioning member movement hole and abuts between the positioning member and the transmission assembly housing, and a plurality of positioning grooves are arranged on one side of the grinding wheel cover corresponding to the positioning member movement hole and around the grinding wheel shaft; the positioning member can be matched with the positioning grooves under the pushing of the second elastic member.

[0016] After the technical scheme is adopted, the following technical effects are achieved: the positioning support is used for limiting the movement range of the positioning member and the second elastic member; when the grinding wheel cover is rotated to a suitable angle, the positioning grooves and the positioning member correspond in the vertical direction at the angle, the second elastic member pushes the positioning member into the positioning grooves, and the circumferential locking of the grinding wheel cover is achieved.

[0017] Further, the ratio of the distance L1 from one end of the machine body housing close to the transmission assembly housing to the grinding wheel shaft axis to the diameter L2 of the motor is H; the value range of the H is 1≤H≤2.5.

[0018] After the technical scheme is adopted, the following technical effects are achieved: the outer contour of the transmission assembly housing of the flat head angle grinder is more slender, the operation in a narrow space is met, and the overall installation structure of the flat head angle grinder is more compact and reasonable.

[0019] Further, the transmission assembly comprises a plurality of bearings, the plurality of bearings are sleeved on the first transmission shaft and are matched with the transmission assembly housing; the outer diameters of the plurality of bearings are sequentially reduced in the direction away from the motor along the first transmission shaft; and the transmission assembly housing top is formed with a plurality of stepped surfaces corresponding to the plurality of bearings.

[0020] The technical effects reached after adopting the technical scheme are as follows: the top of the transmission assembly shell is provided with multiple stepped surfaces, so that the transmission assembly shell and the bearing are more closely matched, and the overall structural strength is improved; meanwhile, the outer diameters of the multiple bearings gradually decrease in the direction away from the motor along the first transmission shaft, so that the flat head angle grinder can be conveniently used for polishing operation in various complex environments, for example, in narrow spaces.

[0021] Further, the transmission assembly further comprises a heat dissipation through hole arranged on one side of the lower surface of the transmission assembly shell close to the fuselage shell, and the heat dissipation through hole is communicated with the inner cavity of the fuselage shell.

[0022] The technical effects reached after adopting the technical scheme are as follows: the heat in the transmission assembly shell and the fuselage shell can be conveniently volatilized to the outside through the heat dissipation through hole, the heat dissipation efficiency is improved, and the transmission efficiency is not affected due to the excessively high temperature of the motor and the transmission assembly during the working process.

[0023] Further, the flat head angle grinder further comprises a flexible coupling sleeve arranged between the first transmission shaft and the motor output shaft.

[0024] The technical effects reached after adopting the technical scheme are as follows: the flexible coupling is drivingly connected between the transmission assembly and the output shaft of the motor, so as to realize the power transmission from the output shaft of the motor to the transmission assembly and realize the transmission; meanwhile, the flexible coupling can reduce the influence of vibration on the motor during the working process of the flat head angle grinder.

[0025] In summary, the above-mentioned various embodiments of the present application can have one or more of the following advantages or benefits: i) the user can press the locking shaft to make the other end of the locking shaft cooperate with the first transmission shaft or the motor output shaft, thereby locking the first transmission shaft or the motor output shaft; the first elastic member can push the locking shaft back to release the first transmission shaft or the motor output shaft when the user releases the locking shaft; ii) after the locking shaft locks the first transmission shaft or the motor output shaft, the grinding wheel stops rotating immediately, and the locking shaft will not be subjected to torsional force in other directions subsequently, so the locking assembly is not easy to be damaged, thereby improving the service life of the locking assembly; iii) the first transmission shaft transmits power to the grinding wheel through the first transmission wheel and the second transmission wheel, thereby controlling the rotation of the grinding wheel; the first transmission wheel and the second transmission wheel can form an included angle, so that the direction of the grinding wheel shaft is different from that of the first transmission shaft, thereby facilitating the grinding wheel to extend into a narrow working environment for operation; iv) when the grinding wheel cover is rotated to a suitable angle, the corresponding positioning groove at the angle corresponds to the positioning member in the vertical direction, and the second elastic member pushes the positioning member into the positioning groove, thereby achieving the circumferential locking of the grinding wheel cover; v) the top of the transmission assembly housing is provided with a plurality of stepped surfaces, so that the transmission assembly housing and the bearings are more closely matched, thereby improving the overall structural strength; at the same time, the outer diameters of the plurality of bearings gradually decrease away from the motor along the first transmission shaft, thereby facilitating the flat head angle grinder to perform grinding operation in various complex environments, such as in a narrow space. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0027] Figure 1 A structural schematic diagram of a flat head angle grinder provided by the embodiment of the present application.

[0028] Figure 2 A structural schematic diagram of a flat head angle grinder in Figure 1 .

[0029] Figure 3 An exploded schematic diagram of a locking member in Figure 2 .

[0030] Figure 4 A connection schematic diagram of a motor and a transmission assembly in Figure 2 .

[0031] Figure 5 Fig. 2 is a structural schematic view of the flat head angle grinder from another perspective. Figure 1 Fig. 3 is a structural schematic view of the flat head angle grinder from another perspective.

[0032] Figure 6 Fig. 4 is a structural schematic view of the flat head angle grinder from another perspective. Figure 5 Fig. 5 is a sectional view in the A-A direction.

[0033] Figure 7 Fig. 6 is an enlarged view of the I region. Figure 6

[0034] Figure 8 Fig. 7 is a structural schematic view of the transmission assembly housing.

[0035] Main element symbol explanation:

[0036] 100 is the flat head angle grinder; 110 is the machine body housing; 111 is the motor mounting cavity; 120 is the motor; 121 is the motor output shaft; 122 is the flexible coupling; 130 is the transmission assembly housing; 131 is the first step surface; 132 is the second step surface; 133 is the third step surface; 134 is the heat dissipation through hole; 135 is the transmission cavity; 136 is the flange piece; 140 is the transmission assembly; 141 is the first transmission shaft; 142 is the first transmission wheel; 143 is the second transmission wheel; 144 is the grinding wheel shaft; 145 is the first bearing; 146 is the second bearing; 147 is the first shaft sleeve; 148 is the second shaft sleeve; 149 is the third shaft sleeve; 150 is the grinding wheel; 151 is the grinding wheel shaft housing; 152 is the grinding wheel cover; 153 is the positioning mechanism; 154 is the positioning bracket; 155 is the positioning piece movement hole; 156 is the positioning piece; 157 is the second elastic piece; 158 is the positioning groove; 160 is the locking assembly; 161 is the locking hole; 162 is the locking shaft; 162a is the first limiting piece; 163 is the first elastic piece; 164 is the second limiting piece; 165 is the limiting groove; 170 is the handle. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] Reference is made to Figures 1-8 ​A flat head angle grinder 100 provided by an embodiment of the application comprises a body shell 110, a motor 120, a transmission assembly shell 130, a transmission assembly 140, a grinding wheel 150 and a locking assembly 160. The body shell 110 comprises a motor mounting cavity 111. The motor 120 is arranged in the motor mounting cavity 111 and comprises a motor output shaft 121. The transmission assembly shell 130 comprises a transmission cavity 135 which is in communication with the motor mounting cavity 111. The transmission assembly 140 is arranged in the transmission cavity 135 and comprises a first transmission shaft 141, a first transmission wheel 142 which is sleeved on one end of the first transmission shaft 141 away from the motor 120, a second transmission wheel 143 which is in engagement with the first transmission wheel 142, and a grinding wheel shaft 144 which is connected to one end of the second transmission wheel 143. The grinding wheel 150 is connected to one end of the grinding wheel shaft 144 away from the second transmission wheel 143.

[0039] In this 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, so as to control the grinding wheel 150 to rotate. An included angle is formed between the first transmission wheel 142 and the second transmission wheel 143, so that the direction of the grinding wheel shaft 144 is different from that of the first transmission shaft 141, and the grinding wheel 150 is facilitated to extend into a long and narrow working environment for operation.

[0040] Preferably, the first transmission wheel 142 and the second transmission wheel 143 are perpendicular to each other, so that the grinding wheel shaft 144 is perpendicular to the first transmission shaft 141. Correspondingly, the grinding wheel 150 is parallel to the first transmission shaft 141. Therefore, when the flat head angle grinder 100 is pushed forward for operation, the grinding wheel 150 can achieve the best cutting effect. For example, the first transmission wheel 142 and the second transmission wheel 143 can be bevel gears which are in engagement with each other, which is not limited herein.

[0041] In a specific embodiment, the flat head angle grinder 100 further comprises the locking assembly 160 which comprises a locking hole 161, a locking shaft 162 and a first elastic member 163. The locking hole 161 is arranged in the body shell 110 or the transmission assembly shell 130. The first elastic member 163 is sleeved on the locking shaft 162 and abuts against the periphery of the locking hole 161. The locking shaft 162 passes through the locking hole 161 and locks the motor output shaft 121 or the first transmission shaft 141.

[0042] The one end of the locking shaft 162 is located outside the transmission assembly shell 130, facilitating the user to press the locking shaft 162. After the locking shaft 162 is pressed, the other end of the locking shaft 162 can cooperate 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 can push the locking shaft 162 back to rebound when the user releases the locking shaft 162, so as to realize the unlocking of 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. The locking shaft 162 will not be subjected to a torsional force in other directions subsequently, so the locking assembly 160 is not easy to be damaged, and the service life of the locking assembly 160 is improved.

[0043] In one specific embodiment, the locking shaft 162, for example, comprises a locking shaft body and a first limiting member 162a connected to the one end of the locking shaft body extending out of the locking hole 161. The one end of the first elastic member 163 away from the locking hole 161 abuts against the first limiting member 162a. For example, the diameter of the first limiting member 162a is greater than the diameter of the locking shaft body, so that the bottom of the first limiting member 162a forms a connecting surface surrounding the locking shaft body, for limiting the one end of the first elastic member 163 to the locking shaft 162, avoiding the one end of the first elastic member 163 away from the transmission assembly shell 130 from being separated from the locking shaft 162.

[0044] The first limiting member 162a and the locking shaft 162 can be connected in a threaded connection, pin connection or the like, or can be an integral structure, which is not limited here.

[0045] In one specific embodiment, the locking assembly 160 further comprises a second limiting member 164 clamped to the one end of the locking shaft body extending into the locking hole 161, and a limiting groove 165 provided in the locking shaft body and cooperating with the second limiting member 164. The second limiting member 164 is used to limit the other end of the locking shaft 162.

[0046] For example, the limiting groove 165 surrounds the locking shaft body, and the second limiting member 164 is, for example, an open retaining ring. After the second limiting member 164 is loaded into the limiting groove 165, it can cooperate with the inner wall of the transmission assembly shell 130, avoiding the locking shaft body from being separated from the locking hole 161, and limiting the distance between the first limiting member 162a and the outer wall of the transmission assembly shell 130, and limiting the maximum length of the first elastic member 163.

[0047] Specifically, when the user presses the locking shaft 162, the first limiting piece 162a pushes the first elastic piece 163 to compress, the second limiting piece 164 separates from the inner wall of the transmission assembly shell 130, and moves with the inner end of the locking shaft 162 to the first transmission shaft 141; when the user releases the locking shaft 162, the first elastic piece 163 expands and pushes the first elastic piece 163 to move away from the transmission assembly shell 130, at the same time, the second limiting piece 164 moves to the inner wall of the transmission assembly shell 130, until the first elastic piece 163 stops expanding when the second limiting piece 164 abuts against the inner wall of the transmission assembly shell 130.

[0048] In a specific embodiment, the transmission assembly 140, for example, includes a first shaft sleeve 147, which is sleeved on the first transmission shaft 141 and corresponds to the axial position of the locking assembly 160 on the first transmission shaft 141. A plurality of locking grooves are circumferentially formed on the first shaft sleeve 147, so that the locking assembly 160 can be locked at multiple points on the first transmission shaft 141. The number of the locking grooves is, for example, 3, 4, or 5, which is not limited here.

[0049] In a specific embodiment, the grinding wheel shaft 144 protrudes from one end of the second transmission wheel 143, and the transmission assembly shell 130 is provided with a corresponding shaft hole to which the end of the grinding wheel shaft 144 is sleeved, thereby improving the stability of the grinding wheel shaft 144.

[0050] In a specific embodiment, the transmission assembly 140 further includes a grinding wheel shaft shell 151, which is sleeved on the grinding wheel shaft 144. The flat head angle grinder 100 further includes a grinding wheel cover 152 and a positioning mechanism 153. The grinding wheel cover 152 is sleeved on one side of the grinding wheel 150 and is rotationally connected with the grinding wheel shaft shell 151. The grinding wheel cover 152 is arranged opposite to the transmission assembly shell 130. The positioning mechanism 153 is arranged between the grinding wheel cover 152 and the transmission assembly shell 130. The grinding wheel cover 152 is used to block the debris generated by grinding, and the angle of the grinding wheel cover 152 is adjusted according to the direction of the debris generated, so as to avoid the influence of the debris on the user. The positioning assembly is used to position and lock the angle of rotation of the grinding wheel cover 152, so as to avoid the change of the angle of the grinding wheel cover 152 due to vibration in actual use.

[0051] Preferably, the inner cavity of the grinding wheel shaft shell 151 and the inner cavity of the transmission assembly shell 130 are communicated, and the inner top of the grinding wheel shaft shell 151 is provided with a gear groove for accommodating the second transmission wheel 143.

[0052] Further, the first bearing 145 is sleeved on the outside of the second transmission wheel 143, and the first bearing 145 is clamped in the grinding wheel shaft shell 151, so that the second transmission wheel 143 can rotate more stably.

[0053] In a specific embodiment, the transmission assembly 140 further comprises a second shaft sleeve 148 and a third shaft sleeve 149, wherein the second shaft sleeve 148 and the third shaft sleeve 149 are clamped on opposite sides of the grinding wheel 150 to improve the stability of the grinding wheel 150; and the second shaft sleeve 148 and the third shaft sleeve 149 are sleeved and fixed on the grinding wheel shaft 144, and 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 can be disc structures, which are not limited here.

[0054] Preferably, one side of the second shaft sleeve 148 opposite the third shaft sleeve 149, and / or one side of the third shaft sleeve 149 opposite the second shaft sleeve 148, is provided with a support step, the inner diameter of the grinding wheel 150 is greater than the diameter of the grinding wheel shaft 144, and the inner side of the grinding wheel 150 is fitted on the support step, avoiding contact between the grinding wheel 150 and the grinding wheel shaft 144, which can cause the grinding wheel shaft 144 to be worn out after long-term use of the grinding wheel 150; at the same time, the installation of the grinding wheel 150 between the second shaft sleeve 148 and the third shaft sleeve 149 also facilitates the disassembly of the grinding wheel 150.

[0055] In a specific embodiment, the positioning mechanism 153 comprises a positioning bracket 154 connected to the transmission assembly housing 130, the positioning bracket 154 is provided with a positioning member movement hole 155 extending to the transmission assembly housing 130, a positioning member 156 is arranged at one end of the positioning member movement hole 155 facing the grinding wheel cover 152, and a second elastic member 157 is arranged in the positioning member movement hole 155 and abuts between the positioning member 156 and the transmission assembly housing 130. The positioning bracket 154 is used to limit the movement range of the positioning member 156 and the second elastic member 157, the second elastic member 157 extends and retracts in the positioning member movement hole 155, and applies a thrust perpendicular to the top surface of the grinding wheel cover 152 to the positioning member 156, thereby pressing the positioning member 156 and the grinding wheel cover 152, so that the grinding wheel cover 152 can be fixed at the current angle and will not loosen during the operation of the flat head angle grinder 100.

[0056] Preferably, the opposite sides of the positioning bracket 154 are connected to the transmission assembly housing 130 by screws or other fasteners, thereby improving the stability of the positioning bracket 154, and correspondingly, the connection between the positioning member 156 and the grinding wheel cover 152 is also more stable.

[0057] In a specific embodiment, the positioning mechanism 153 further comprises a plurality of positioning grooves 158, which are arranged on one side of the positioning hole 155 of the grinding wheel cover 152 and surround the grinding wheel shaft 144; the positioning member 156 is capable of cooperating with the positioning groove 158 under the pushing of the second elastic member 157. For example, the positioning member 156 is in a spherical structure, and the positioning groove 158 is in an arc-shaped groove, so that the positioning member 156 can cooperate with the positioning groove 158 smoothly under the pushing of the second elastic member 157 even if it rotates.

[0058] It should be noted that when the grinding wheel cover 152 is rotated to a proper angle, the positioning groove 158 at the angle corresponds to the positioning member 156 in the vertical direction, and the second elastic member 157 pushes the positioning member 156 into the positioning groove 158, thereby achieving the circumferential locking of the grinding wheel cover 152.

[0059] In a specific embodiment, the distance L1 between the end of the machine body shell 110 close to the transmission assembly shell 130 and the axis of the grinding wheel shaft 144 is in a ratio H with the diameter L2 of the motor 120; wherein the value of H is in the range of 1≤H≤2.5, for example, 1.32≤H≤1.42. Under this ratio, the outer contour of the transmission assembly shell 130 of the flat head angle grinder 100 is more slender, which meets the operation in a narrow space, and the overall installation structure of the flat head angle grinder 100 is more compact and reasonable.

[0060] In a specific embodiment, the transmission assembly 140 comprises a plurality of bearings, which are sleeved on the first transmission shaft 141 and cooperate with the transmission assembly shell 130, thereby improving the stability of the first transmission shaft 141. For example, the transmission assembly 140 comprises a first bearing 145 and a second bearing 146, and the first transmission shaft 141 comprises a plurality of shaft segments with different diameters, wherein the first shaft segment at the middle position of the first transmission shaft 141 has the largest diameter, 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, thereby further improving the stability of the first transmission shaft 141.

[0061] Preferably, the outer diameters of the plurality of bearings decrease in turn in the direction away from the motor 120 along the first transmission shaft 141, for example, the first bearing 145 is located on the side away from the motor 120 of the second bearing 146, and the outer diameter of the first bearing 145 is smaller than that of the second bearing 146. Further, the top of the transmission assembly housing 130 forms a plurality of stepped surfaces corresponding to the plurality of bearings. Among them, the top of the transmission assembly housing 130 is provided as a plurality of stepped surfaces, which makes the transmission assembly housing 130 and the bearings fit more closely on the basis of ensuring that the thickness of the transmission assembly housing 130 does not change significantly, thereby improving the overall structural strength; at the same time, the outer diameters of the plurality of bearings decrease in turn in the direction away from the motor 120 along the first transmission shaft 141, which facilitates the flat head angle grinder 100 to perform grinding operations in various complex environments, for example, in narrow spaces.

[0062] Preferably, the plurality of stepped surfaces, for example, include a first stepped surface 131, a second stepped surface 132, and a third stepped surface 133; wherein 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 the end of the grinding wheel shaft 144 away from the grinding wheel 150 corresponds to the third stepped surface 133.

[0063] 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=5-6:3:1, so that the transmission assembly housing 130 is more compact, facilitating work in long and narrow passage environments. For example, h1:h2:h3=6:3:1, which is not limited here.

[0064] In a specific embodiment, the transmission assembly 140, for example, further includes a heat dissipation through hole 134 provided on the lower surface of the transmission assembly housing 130 close to the machine body housing 110, and the heat dissipation through hole 134 communicates with the inner cavity of the machine body housing 110. For example, the transmission assembly housing 130 includes a flange 136 close to the machine body housing 110, wherein the flange 136 has a flange surface, and the transmission assembly housing 130 is connected with the motor 120 housing through fasteners and fixing holes on the flange surface; the heat dissipation through hole 134 is provided on the flange surface, which facilitates the evaporation of heat in the transmission assembly housing 130 and the machine body housing 110 to the outside, improves the heat dissipation efficiency, and avoids affecting the transmission efficiency due to excessive temperature of the motor 120 and the transmission assembly 140 during work.

[0065] Preferably, the heat dissipation through hole 134 is, for example, a plurality of parallel strip-shaped holes, which are not limited here.

[0066] In a specific embodiment, the flat head angle grinder 100 further comprises, for example, a flexible coupling 122 sleeved between the first transmission shaft 141 and the motor output shaft 121. The flexible coupling 122 is drivingly connected between the transmission assembly 140 and the motor output shaft 121, so as to realize power transmission from the motor output shaft 121 to the transmission assembly 140, and realize transmission. Meanwhile, the flexible coupling 122 can reduce vibration during the working process of the flat head angle grinder 100.

[0067] In a specific embodiment, the flat head angle grinder 100 further comprises, for example, a handle 170 vertically connected to one side of the transmission housing 130, for holding the flat head angle grinder 100, and facilitating pushing the flat head angle grinder 100 for work.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A flat-head angle grinder characterized by, The machine body shell (110) comprises a motor mounting 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 shell (130) comprises a transmission cavity (135) which is communicated with the motor mounting cavity (111); The transmission assembly (140) is arranged in the transmission cavity (135), and the transmission assembly (140) comprises: A first transmission shaft (141); a first transmission wheel (142) sleeved on one end of the first transmission shaft (141) away from the motor (120); a second transmission wheel (143) engaged with the first transmission wheel (142); and a grinding wheel shaft (144) connected to one end of the second transmission wheel (143); A grinding wheel (150) connected to one end of the grinding wheel shaft (144) away from the second transmission wheel (143); A locking assembly (160); The transmission assembly (140) comprises a plurality of bearings sleeved on the first transmission shaft (141) and matched with the transmission assembly shell (130); Wherein, the outer diameters of the plurality of bearings gradually decrease in the direction away from the motor (120) along the first transmission shaft (141); and the transmission assembly shell (130) forms a plurality of stepped surfaces corresponding to the plurality of bearings on the top thereof; The transmission assembly (140) comprises a first bearing (145) and a second bearing (146), and the first transmission shaft (141) comprises a plurality of shaft segments with different diameters, wherein a first shaft segment located at the middle position of the first transmission shaft (141) has the largest diameter, and the first bearing (145) and the second bearing (146) are clamped on the front and back sides of the first shaft segment; The plurality of stepped surfaces comprise a first stepped surface (131), a second stepped surface (132) and a third stepped surface (133); wherein 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) away from the grinding wheel (150) corresponds to the third stepped surface (133); 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=5-6:3:1; 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. ​ The H is in the range of 1 to 2.

5.

2. The flat-head angle grinder according to claim 1, characterized in that, The locking assembly further comprises a locking hole (161), a locking shaft (162) and a first elastic member (163), the locking hole (161) is arranged on the body shell (110) or the transmission assembly shell (130), the first elastic member (163) is sleeved on the locking shaft (162) and abuts the locking hole (161) side, the locking shaft (162) passes through the locking hole (161) and locks the motor output shaft (121) or the first transmission shaft (141).

3. The flat-head angle grinder according to claim 2, characterized in that, The locking shaft (162) comprises a locking shaft body and a first limiting member (162a), and the first limiting member (162a) is connected to one end of the locking shaft body extending out of the locking hole (161); The first elastic member (163) is connected to one end of the locking hole (161) and abuts the first limiting member (162a).

4. The flat-head angle grinder according to claim 3, characterized in that, The locking assembly (160) further comprises: A second limiting member (164) is arranged on one end of the locking shaft body extending into the locking hole (161); A limiting groove (165) is arranged on the locking shaft body and cooperates with the second limiting member (164).

5. The flat-head angle grinder according to claim 4, characterized in that, The flat head angle grinder further comprises: A grinding wheel shaft shell (151) is sleeved on the grinding wheel shaft (144); A 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); A positioning mechanism (153) is arranged between the grinding wheel cover (152) and the transmission assembly shell (130).

6. The flat-head angle grinder according to claim 5, characterized in that, The positioning mechanism (153) comprises: A positioning bracket (154) is connected to the transmission assembly shell (130), and the positioning bracket (154) is provided with a penetrating positioning member movement hole (155), and the positioning member movement hole (155) extends to the transmission assembly shell (130); A positioning member (156) is arranged at one end of the positioning member movement hole (155) facing the grinding wheel cover (152); A second elastic member (157) is located in the positioning member movement hole (155) and abuts between the positioning member (156) and the transmission assembly shell (130); A plurality of positioning grooves (158) are arranged on one side of the grinding wheel cover (152) corresponding to the positioning member movement hole (155) and surround the grinding wheel shaft (144); the positioning member (156) can cooperate with the positioning groove (158) under the pushing of the second elastic member (157).

7. The flat-head angle grinder according to any one of claims 1-6, characterized in that, The transmission assembly (140) further comprises: A heat dissipation through hole (134) is arranged on the lower surface of the transmission assembly shell (130) close to one side of the body shell (110), and the heat dissipation through hole (134) communicates with the inner cavity of the body shell (110).

8. The flat-head angle grinder according to any one of claims 1-6, characterized in that, Further comprising: A flexible coupling (122) is sleeved between the first transmission shaft (141) and the motor output shaft (121).

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