CN218947277U - Safety angle grinder capable of stopping immediately after separating from workpiece - Google Patents

Abstract

The utility model relates to a safe angle grinder which is separated from a workpiece, namely, is stopped, and is matched with a central shaft capable of axially sliding by utilizing a micro switch, when a grinding disc is abutted against the workpiece, the central shaft is pressed and axially moves along an outer shaft to push a sliding block to press the micro switch to be closed, a controller can start a driving motor to drive the grinding disc to rotate, when the grinding disc leaves the workpiece, the central shaft is pushed outwards by the sliding block under the action of spring elasticity due to the fact that the pressing pressure of the central shaft disappears, and the sliding block is separated from the micro switch to disconnect the micro switch, so that the controller cannot start the driving motor, and therefore the situation that the grinding disc cannot be started when the grinding disc does not contact the workpiece is ensured, and the use safety of the angle grinder is improved.

Description

Safety angle grinder capable of stopping immediately after separating from workpiece

Technical Field

The utility model belongs to the technical field of electric tools, and particularly relates to a safe angle grinder capable of being separated from a workpiece and being stopped.

Background

The polishing disc of the angle grinder is not provided with a protective cover generally, has high destructiveness, can cause injury to the body of an operator if used carelessly, has extremely high rotating speed when the angle grinder is separated from a workpiece and is in an idle state, and can injure the operator if the operator does not close the angle grinder in time. Sometimes, the switch of the angle grinder is in a closed state, an operator directly inserts a power supply under the condition of unknowing, and the angle grinder possibly falls off from the hand of the operator due to strong torsion force at the moment of inserting the power supply, so that the angle grinder is damaged or hurts the operator.

Disclosure of Invention

The utility model aims to solve the technical problems that: the safe angle grinder is separated from a workpiece, namely, stopped, and solves the technical problem that the angle grinder has safety risks in idle rotation.

In order to solve the technical problems, the utility model adopts the following technical scheme: the safe angle grinder capable of being stopped immediately after being separated from a workpiece comprises a shell, a driving motor fixedly arranged in the shell, a pinion fixedly connected on an output shaft of the driving motor, a driving shaft rotationally connected on the shell in front of the driving motor, a large gear fixedly sleeved on the driving shaft and meshed with the pinion, wherein one end of the driving shaft extends out of the shell and is externally connected with a grinding disc, a circuit board is also arranged in the shell, a controller for controlling the driving motor to work is arranged on the circuit board, a main switch for sending signals to the controller is arranged on the shell, the driving shaft comprises a hollow outer shaft and a central shaft axially and slidingly inserted in the outer shaft, two ends of the outer shaft are respectively rotationally connected with the shell, the large gear is fixedly sleeved on the outer shaft, two ends of the central shaft extend out of the outer shaft, one end of the central shaft positioned outside the shell is connected with the grinding disc, one end of the central shaft in the shell is connected with a limit disc with the diameter larger than that of the central shaft, the limit disc is opposite to the end face of the outer shaft, a detection groove coaxial with the central shaft is formed in the inner wall of the shell, a sliding block is axially and slidably connected in the detection groove, the central shaft and the limit disc are inserted into the detection groove, a thrust bearing coaxial with the central shaft is arranged between the limit disc and the sliding block, one end of the thrust bearing is fixedly connected on the sliding block, the other end of the thrust bearing is matched with the limit disc, a spring is arranged between the sliding block and the bottom surface of the detection groove, the elastic force of the spring drives the sliding block to push the thrust bearing to be abutted against the limit disc, a push type micro-switch is fixedly connected on the bottom surface of the detection groove, a button of the micro-switch is opposite to the sliding block, the micro-switch is electrically connected with a controller, the axial movement of the central shaft can push the sliding block to be in press connection with the button of the micro-switch, so that the micro-switch is closed, the outer wall of the central shaft is provided with an axially extending sliding groove, the inner wall of the outer shaft is provided with a sliding rail with the length shorter than that of the sliding groove, and the sliding rail is slidably inserted into the sliding groove, so that the central shaft and the outer shaft synchronously rotate.

As a preferred solution, the pinion and the gearwheel are bevel gears that mesh with each other.

As a preferable scheme, the upper end of the thrust bearing is embedded in the sliding block.

The beneficial effects of the utility model are as follows: according to the utility model, the micro switch is matched with the central shaft capable of axially sliding, when the polishing disc is abutted against a workpiece, the central shaft is pressed to axially move along the outer shaft to push the sliding block to press the micro switch, so that the micro switch is closed, the controller can start the driving motor to drive the polishing disc to rotate, when the polishing disc leaves the workpiece, the central shaft is pushed outwards by the sliding block under the action of spring force due to the fact that the pressing pressure of the central shaft disappears, the sliding block is separated from the micro switch to disconnect the micro switch, and then the controller cannot start the driving motor, so that the polishing disc cannot start when the polishing disc does not contact the workpiece, and the use safety of the angle grinder is improved.

Drawings

The utility model is described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is an enlarged view of a portion a in fig. 1;

FIG. 3 is a cross-sectional view of the drive shaft;

in fig. 1 to 3: 1. the device comprises a shell, 2, a driving motor, 3, a pinion, 4, a driving shaft, 4a, an outer shaft, 4b, a central shaft, 4c, a limiting disc, 4d, a sliding groove, 4e, a sliding rail, 5, a large gear, 6, a polishing disc, 7, a circuit board, 8, a controller, 9, a main switch, 10, a detection groove, 11, a sliding block, 12, a thrust bearing, 13, a spring, 14 and a micro switch.

Detailed Description

Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

The safe angle grinder which is separated from a workpiece and is stopped as shown in fig. 1-3 comprises a machine shell 1, a driving motor 2 fixedly arranged in the machine shell 1, a pinion 3 fixedly connected to an output shaft of the driving motor 2, a driving shaft 4 rotatably connected to the machine shell 1 in front of the driving motor 2, and a large gear 5 fixedly sleeved on the driving shaft 4 and meshed with the pinion 3, wherein the pinion 3 and the large gear 5 are bevel gears. One end of the driving shaft 4 extends out of the shell 1 to be connected with the polishing disc 6, a circuit board 7 is arranged in the shell 1, a controller 8 for controlling the driving motor 2 to work is arranged on the circuit board 7, a main switch 9 for sending signals to the controller 8 is arranged on the shell 1, the driving shaft 4 comprises a hollow outer shaft 4a and a central shaft 4b axially and slidingly inserted in the outer shaft 4a, two ends of the outer shaft 4a are respectively and rotatably connected with the shell 1, a large gear 5 is fixedly sleeved on the outer shaft 4a, two ends of the central shaft 4b extend out of the outer shaft 4a, one end of the central shaft 4b, positioned outside the shell 1, is connected with the polishing disc 6, one end of the central shaft 4b, positioned inside the shell 1, is connected with a limit disc 4c with a diameter larger than that of the central shaft 4b, the limit disc 4c is opposite to the end face of the outer shaft 4a, a detection groove 10 coaxial with the central shaft 4b is arranged on the inner wall of the shell 1, the detection groove 10 is axially and slidingly connected with a sliding block 11, the central shaft 4b and the limit disk 4c are inserted into the detection groove 10, a thrust bearing 12 which is coaxially arranged with the central shaft 4b is arranged between the limit disk 4c and the slide block 11, the upper end of the thrust bearing 12 is fixedly embedded on the slide block 11 to ensure connection stability and position precision, the other end is matched with the limit disk 4c, a spring 13 is arranged between the slide block 11 and the bottom surface of the detection groove 10, the spring force of the spring 13 drives the slide block 11 to push the thrust bearing 12 to be abutted with the limit disk 4c, the bottom surface of the detection groove 10 is fixedly connected with a push type micro switch 14, the button of the micro switch 14 is opposite to the slide block 11, the micro switch 14 is electrically connected with the controller 8, the central shaft 4b axially moves to push the slide block 11 to be pressed on the button of the micro switch 14 so as to close the micro switch 14, the outer wall of the central shaft 4b is provided with a chute 4d which axially extends, the inner wall of the outer shaft 4a is provided with a slide rail 4e with a length shorter than that of the slide groove, and the slide rail 4e is slidably inserted into the slide groove 4d, so that the central shaft 4b and the outer shaft 4a synchronously rotate.

The working process of the utility model is as follows: when the polishing disc 6 is abutted against a workpiece, the central shaft 4b is pressed to axially move along the outer shaft 4a, the sliding block 11 is pushed to press the micro switch 14, so that the micro switch 14 is closed, a signal is sent to the controller 8, the controller 14 can start the driving motor 2 to drive the polishing disc 6 to rotate when receiving an opening signal, when the polishing disc 6 leaves the workpiece, the central shaft 4b is pushed away from the micro switch 14 by the sliding block 11 due to the pressure loss of the central shaft 4b under the elastic force of the spring 13, the sliding block 11 is separated from the micro switch 14, so that the micro switch 14 is disconnected, and the controller 8 cannot start the driving motor 2, so that the use safety of the angle grinder is improved when the polishing disc 6 does not contact the workpiece.

The above embodiments are merely illustrative of the principles and effects of the present utility model, and some of the applied embodiments, and are not intended to limit the utility model; it should be noted that modifications and improvements can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the present utility model.

Claims (3)

1. The safe angle grinder separated from a workpiece, namely stopping, comprises a machine shell (1), a driving motor (2) fixedly arranged in the machine shell (1), a pinion (3) fixedly connected to an output shaft of the driving motor (2), a driving shaft (4) rotationally connected to the machine shell (1) in front of the driving motor (2), a large gear (5) fixedly sleeved on the driving shaft (4) and meshed with the pinion (3), wherein one end of the driving shaft (4) extends out of the machine shell (1) and is externally connected with a grinding disc (6), the safe angle grinder is characterized in that a circuit board (7) is further arranged in the machine shell (1), a controller (8) for controlling the driving motor (2) to work is arranged on the circuit board (7), a main switch (9) for sending signals to the controller (8) is arranged on the machine shell (1), the driving shaft (4) comprises a hollow outer shaft (4 a) and a central shaft (4 b) axially and slidably spliced in the driving shaft (4 a), two ends of the outer shaft (4 a) are respectively rotationally connected with the machine shell (1), one end of the large gear (5) is fixedly sleeved on the outer shaft (4 a), the central shaft (4 b) is connected with the outer shaft (4 b) and the two ends of the central shaft (4 b) are respectively connected with the outer shaft (4 a) and are located at one end of the outer end (6) of the outer shaft (4 a), one end of the central shaft (4 b) positioned in the shell (1) is connected with a limit disc (4 c) with the diameter larger than that of the central shaft (4 b), the limit disc (4 c) is opposite to the end face of the outer shaft (4 a), a detection groove (10) coaxial with the central shaft (4 b) is formed in the inner wall of the shell (1), a sliding block (11) is axially and slidably connected in the detection groove (10), the central shaft (4 b) and the limit disc (4 c) are inserted into the detection groove (10), a thrust bearing (12) coaxial with the central shaft (4 b) is arranged between the limit disc (4 c) and the sliding block (11), one end of the thrust bearing (12) is fixedly connected to the sliding block (11), the other end of the thrust bearing (12) is matched with the limit disc (4 c), a spring (13) is arranged between the sliding block (11) and the bottom surface of the detection groove (10), the elastic force of the spring (13) drives the sliding block (11) to push the thrust bearing (12) to abut against the limit disc (4 c), the bottom surface of the detection groove (10) is fixedly connected with a push type micro switch (14) to push a micro switch (14) to be electrically connected with the micro switch (11) in a pressing mode, the micro switch (14) is directly opposite to the micro switch (11) in the axial direction, and the micro switch (11) can be electrically connected with the micro switch (8), the micro switch (14) is closed, the outer wall of the central shaft (4 b) is provided with an axially extending sliding groove (4 d), the inner wall of the outer shaft (4 a) is provided with a sliding rail (4 e) with the length shorter than that of the sliding groove, and the sliding rail (4 e) is slidably inserted into the sliding groove (4 d) so that the central shaft (4 b) and the outer shaft (4 a) synchronously rotate.

2. The off-workpiece, i.e. shut-down, safe angle grinder according to claim 1, characterized in that the pinion (3) and the gearwheel (5) are intermeshing bevel gears.

3. The machine according to claim 1, characterized in that the thrust bearing (12) is embedded in the slide (11) at its upper end.

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