CN210790433U

CN210790433U - Angle mill with overload protection

Info

Publication number: CN210790433U
Application number: CN201920762091.0U
Authority: CN
Inventors: 徐杭
Original assignee: Zhejiang Aote Tools Co ltd
Current assignee: Zhejiang Aote Tools Co ltd
Priority date: 2019-05-25
Filing date: 2019-05-25
Publication date: 2020-06-19
Anticipated expiration: 2029-05-25

Abstract

The utility model belongs to the field of angle grinders, and relates to an angle grinder with overload protection, which comprises a shell, a main shaft head and a motor, wherein the motor is connected with an overload protector which is connected with a switch push button, the switch push button is provided with a reset bulge for triggering the overload protector to reset, and the reset bulge is electrically connected with a contact surface of the overload protector reset button; the overload protector comprises a shell, a first conducting strip, a second conducting strip, a temperature sensor, a first contact, a second contact, a spring and an adjusting screw; one side of the shell is provided with a first mounting groove, and the other side of the shell is provided with a second mounting groove; the first conducting plate and the second conducting plate are both L-shaped, a first contact is fixed on one end of each of the first conducting plate and the second conducting plate, and the other end of each of the first conducting plate and the second conducting plate extends out of the second mounting groove and the first mounting groove respectively; the temperature sensor is arranged in the shell, a second contact corresponding to the first contact is arranged on the temperature sensor, and the adjusting screw penetrates through the temperature sensor and the spring from top to bottom in sequence and is fixed with the shell through threads.

Description

Angle mill with overload protection

Technical Field

The utility model belongs to the technical field of the angle mill, refer in particular to an angle mill with overload protection.

Background

The electric angle grinder (low-power electric angle grinder) has the functions of grinding, cutting and the like, and is an electric tool with wide application. The electric angle grinder has one motor casing, one driving unit with one driving shaft fixed to one end of the casing, one main switch to control the on/off of the motor inside the casing, and one switch pushing button outside the casing. The cutting of metal and stone requires large energy consumption, and in the process of cutting by using a low-power electric angle grinder, a motor of the angle grinder is easy to overload, while a general angle grinder is not provided with an overload protector, and long-time overload can cause adverse consequences such as motor damage and failure of the angle grinder.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure, with low costs, long service life, high security performance have overload protection's angle mill.

The purpose of the utility model is realized like this: an angle grinder with overload protection comprises a shell, a main shaft head arranged at the front end of the shell and a motor driving the main shaft head to rotate, wherein the motor is connected with a main switch for controlling the on/off of the motor and a normally closed overload protector connected with a main switch circuit in series; the overload protector comprises a shell, a first conducting strip, a second conducting strip, a temperature sensor, a first contact, a second contact, a spring and an adjusting screw; one side of the shell is provided with a first mounting groove, and the other side of the shell is provided with a second mounting groove; the first conducting plate and the second conducting plate are both L-shaped, a first contact is fixed on one end of each of the first conducting plate and the second conducting plate, and the other end of each of the first conducting plate and the second conducting plate extends out of the second mounting groove and the first mounting groove respectively; the temperature sensor sets up in the shell, and have on it with the second contact that first contact corresponds the setting, adjusting screw from last to passing temperature sensor and spring down in proper order and with shell thread tightening.

Preferably, the central position of the temperature sensor is provided with a straight hole, and the adjusting screw penetrates through the middle of the straight hole.

Preferably, the first conducting strip and the second conducting strip are both arranged in the shell, and one end provided with the first contact is fixed with the shell through a rivet.

Preferably, the temperature sensor is rectangular, the short edge of the temperature sensor is arc-shaped, and a cavity corresponding to the temperature sensor is arranged inside the shell.

Preferably, the second contact is symmetrically disposed on a lower surface of the temperature sensor.

Preferably, the bottom of the shell is provided with a spring groove, the spring is abutted against the spring groove, and the lower part of the spring groove is a threaded hole for screwing an adjusting screw into.

Preferably, a first lead-out inserting piece and a second lead-out inserting piece are arranged in the temperature sensor, one ends of the first lead-out inserting piece and the second lead-out inserting piece form connecting terminals, and the other ends of the first lead-out inserting piece and the second lead-out inserting piece are respectively connected with two ends of a thermistor; the thermistor is characterized in that a concave part is arranged on the temperature sensor at the thermistor, the heat conduction layer is wrapped on the outer side of the thermistor body, and the heat conduction layer is not conductive.

Preferably, the connection mode of the first lead-out inserting sheet and the second lead-out inserting sheet and the thermistor adopts a spot welding and tin soldering mode.

Preferably, the first leading-out inserting piece and the second leading-out inserting piece are made of heat conduction materials.

Preferably, the heat conducting layer is made of heat conducting silicone grease.

Compared with the prior art, the utility model outstanding and profitable technological effect is: the utility model discloses set up overload protection ware can effectual protection angle mill, prevent that the angle mill from damaging to overload protection ware adopts the two pairs of contacts of alternate segregation, and arbitrary contact separation can the open circuit, and double protection circuit is more reliable. The central position of the temperature sensor is provided with a linear hole, so that the temperature sensing element is easier to turn over, and the temperature sensing element is fixed by adopting an adjusting screw and a spring, so that the function of fine adjustment of the action time of the protector can be realized.

Drawings

FIG. 1 is a schematic view of the present invention;

fig. 2 is an exploded view of the overload protector of the present invention;

fig. 3 is a cross-sectional view of the overload protector of the present invention;

fig. 4 is a schematic diagram of the temperature sensor of the present invention.

Detailed Description

The invention will be further described with reference to specific embodiments.

As shown in fig. 1-4, an angle grinder with overload protection comprises a housing 21, a spindle head 22 arranged at the front end of the housing 21, and a motor 23 for driving the spindle head 22 to rotate, wherein the motor 23 is connected with a main switch for controlling the on/off of the motor 23 and a normally closed overload protector 24 connected in series with a main switch circuit, the overload protector 24 is connected with a switch push button 25 for controlling the on/off of the overload protector 24, the switch push button 25 is provided with a reset protrusion 26 for triggering the reset of the overload protector 24, and the reset protrusion 26 is electrically connected with a contact surface of the reset button of the overload protector 24; the overload protector 24 comprises a shell 1, a first conducting strip 2, a second conducting strip 3, a temperature sensor 4, a first contact 5, a second contact 6, a spring 7 and an adjusting screw 8; one side of the shell 1 is provided with a first mounting groove 11, and the other side is provided with a second mounting groove 12; the first conducting plate 2 and the second conducting plate 3 are both L-shaped, one ends of the first conducting plate 2 and the second conducting plate 3 are both fixed with a first contact 5, and the other ends of the first conducting plate 2 and the second conducting plate 3 respectively extend out of the second mounting groove 12 and the first mounting groove 11; temperature sensor 4 sets up in the shell 1, and have on it with the second contact 6 that first contact 5 corresponds the setting, adjusting screw 8 from last to passing temperature sensor 4 and spring 7 in proper order down and with shell 1 thread tightening.

This technical scheme is when overload protection ware 24 access circuit, and operating current passes through temperature sensor 4, and temperature sensor 4 is back under the effect of electric current heat effect, and the sudden change upset, temperature sensor 4 both ends produce the displacement change and drive two second contacts 6 and move together for

second contact

6 and 5 separation of first contact, thereby the circuit loop cuts off, and heat can automatic re-setting after loosing when temperature sensor 4, thereby two pairs of contact switch-on circuit loops.

Preferably, the temperature sensor 4 has a straight hole 41 at a central position, and the adjusting screw 8 passes through the straight hole 41.

Preferably, the first conducting strip 2 and the second conducting strip 3 are both arranged in the housing 1, and one end provided with the first contact 5 is fixed with the housing 1 through a rivet.

Preferably, the temperature sensor 4 is rectangular, the short side of the temperature sensor is arc-shaped, and a cavity corresponding to the temperature sensor 4 is arranged inside the housing 1.

Preferably, the second contacts 6 are symmetrically arranged on the lower surface of the temperature sensor 4.

Preferably, the bottom of the housing 1 has a spring groove 13, the spring 7 is abutted in the spring groove 13, and the lower part of the spring groove 13 is a threaded hole for screwing the adjusting screw 8.

Preferably, a first lead-out insertion sheet 42 and a second lead-out insertion sheet 43 are arranged in the temperature sensor 4, one ends of the first lead-out insertion sheet 42 and the second lead-out insertion sheet 43 form a connecting terminal 45, and the other ends of the first lead-out insertion sheet 42 and the second lead-out insertion sheet 43 are respectively connected with two ends of a thermistor 44; the temperature sensor 4 at the thermistor 44 is provided with a recess, the outer side of the thermistor 44 is wrapped with a heat conduction layer 46, and the heat conduction layer 46 is not electrically conductive.

Preferably, the connection mode of the first lead-out inserting sheet 42 and the second lead-out inserting sheet 43 and the thermistor 44 adopts a spot welding and soldering mode.

Preferably, the first lead-out inserting piece 42 and the second lead-out inserting piece 43 are made of heat conducting materials. Such as copper, aluminum, etc., or alloys thereof.

The connection mode of the first lead-out inserting sheet 42 and the second lead-out inserting sheet 43 and the thermistor 44 is preferably a spot welding and tin soldering mode, and by adopting the mode, the contact area of the thermistor pin and the first lead-out inserting sheet 42 and the second lead-out inserting sheet 43 can be increased, so that the heat conduction speed is further increased.

Preferably, the heat conductive layer 46 is made of heat conductive silicone grease. The heat of the liquid to be measured is transferred to the thermistor 44, but the thermistor is not conductive, and the current change between the first leading-out inserting sheet 42 and the second leading-out inserting sheet 43 is not influenced.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The angle grinder with the overload protection function is characterized by comprising a shell (21), a spindle head (22) arranged at the front end of the shell (21) and a motor (23) driving the spindle head (22) to rotate, wherein the motor (23) is connected with a main switch for controlling the on/off of the motor (23) and a normally closed overload protector (24) connected with a main switch circuit in series, the overload protector (24) is connected with a switch push button (25) for controlling the on/off of the overload protector (24), a reset bulge (26) for triggering the overload protector (24) to reset is arranged on the switch push button (25), and the reset bulge (26) is electrically connected with a contact surface of the reset button of the overload protector (24); the overload protector (24) comprises a shell (1), a first conducting sheet (2), a second conducting sheet (3), a temperature sensor (4), a first contact (5), a second contact (6), a spring (7) and an adjusting screw (8); one side of the shell (1) is provided with a first mounting groove (11), and the other side is provided with a second mounting groove (12); the first conducting strip (2) and the second conducting strip (3) are L-shaped, one ends of the first conducting strip (2) and the second conducting strip (3) are respectively fixed with a first contact (5), and the other ends of the first conducting strip (2) and the second conducting strip (3) respectively extend out of the second mounting groove (12) and the first mounting groove (11); temperature sensor (4) set up in shell (1), and have on it with first contact (5) correspond second contact (6) that set up, adjusting screw (8) from last to passing temperature sensor (4) and spring (7) down in proper order and with shell (1) thread tightening.

2. The angle grinder with overload protection according to claim 1, characterized in that the temperature sensor (4) has a slotted hole (41) in its central position, the adjusting screw (8) passing through the slotted hole (41).

3. The angle grinder with overload protection according to claim 1, wherein the first conducting strip (2) and the second conducting strip (3) are both arranged in the housing (1), and one end provided with the first contact (5) is fixed with the housing (1) through a rivet.

4. The angle grinder with overload protection according to any one of claims 1 to 3, characterized in that the temperature sensor (4) is rectangular and the short side of the temperature sensor is arc-shaped, and the inside of the housing (1) is provided with a cavity corresponding to the temperature sensor (4).

5. The angle grinder with overload protection according to claim 4, characterized in that the second contacts (6) are symmetrically arranged on the lower surface of the temperature sensor (4).

6. The angle grinder with overload protection according to claim 1, characterized in that the bottom of the housing (1) has a spring groove (13), the spring (7) rests in the spring groove (13), and the lower part of the spring groove (13) is a threaded hole for screwing the adjusting screw (8).

7. The angle grinder with the overload protection function according to claim 4, wherein a first lead-out insert (42) and a second lead-out insert (43) are arranged in the temperature sensor (4), one ends of the first lead-out insert (42) and the second lead-out insert (43) form a connecting terminal (45), and the other ends of the first lead-out insert (42) and the second lead-out insert (43) are respectively connected with two ends of a thermistor (44); the temperature sensor (4) at the thermistor (44) is provided with a concave part, the outer side of the thermistor (44) is wrapped with a heat conduction layer (46), and the heat conduction layer (46) is not conductive.

8. The angle grinder with overload protection as recited in claim 7, wherein the first lead-out insert (42) and the second lead-out insert (43) are connected with the thermistor (44) by spot welding and soldering.

9. The angle grinder with overload protection as recited in claim 7, wherein the material of the first leading-out insert sheet (42) and the second leading-out insert sheet (43) is a heat conductive material.

10. The angle grinder with overload protection according to claim 7, wherein the heat conducting layer (46) is made of heat conducting silicone grease.