CN209811953U

CN209811953U - Electric grinder

Info

Publication number: CN209811953U
Application number: CN201920498840.3U
Authority: CN
Inventors: 高立群
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2019-12-20
Anticipated expiration: 2029-04-12

Abstract

The utility model provides an electric grinder relates to electronic grinding tool technical field, has solved the electric grinder who exists among the prior art and has carelessly taken off the hand back in the use, cuts the technical problem that the operator is volatilizing the article of damage being processed easily. The device comprises a pressure-bearing structure and a motor start-stop control structure, wherein a hand-holding area is arranged on a shell of the electric grinder, the pressure-bearing structure is arranged on the surface of the hand-holding area, and the pressure-bearing structure can be pressed when the hand-holding area is held; the motor start-stop control structure is arranged in the shell, the bearing structure and the motor of the electric grinder are connected with the motor start-stop control structure, and when the pressure value borne by the bearing structure is larger than or smaller than a preset value, the motor start-stop control structure can control the motor to start/stop. The utility model is used for improve the security performance in the electric grinder use.

Description

Electric grinder

Technical Field

The utility model belongs to the technical field of electric grinding tool technique and specifically relates to an electric grinder is related to.

Background

An electric grinder is a grinding tool and is commonly used for wood carving and jade grinding.

The electric grinder mainly comprises a shell, a motor and a cutter, wherein the motor is arranged in the shell, the shell is provided with a cutter mounting structure, and the cutter (a cutting cutter, a grinding tool, a polishing tool and the like) can be mounted on the cutter mounting structure. The operator can hold the electric grinder in hand, and turn on the switch to make the motor run electrically, at this moment, the output shaft of the motor can drive the cutter to rotate, and then cut off, polish or polish the timber.

The motor of electric grinder drives the rotatory in-process of cutting tool, if the user's operation is improper when causing the electric grinder to take off the hand, the cutting tool of department and rotation state may cut the user or damage the article of being polished, has certain potential safety hazard.

The applicant has found that the prior art has at least the following technical problems:

after the electric grinder in the prior art carelessly takes off the hand in the use process, an operator is easily cut to damage a processed object, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric grinder to solve the electric grinder that exists among the prior art and carelessly take off the hand back in the use, cut the operator easily and be waved and damage the article of being processed, have the technical problem of potential safety hazard. The utility model provides a great deal of technological effect (simple structure, convenient to use, production low in manufacturing cost) that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides an electric grinder, which comprises a pressure-bearing structure and a motor start-stop control structure, wherein a hand-holding area is arranged on a shell of the electric grinder, the pressure-bearing structure is arranged on the surface of the hand-holding area, and the pressure-bearing structure can be pressed when the hand-holding area is held; the motor start-stop control structure is arranged in the shell, the pressure-bearing structure and the motor of the electric grinder are connected with the motor start-stop control structure, and when the pressure value borne by the pressure-bearing structure is larger than or smaller than a preset value, the motor start-stop control structure can control the motor to start/stop.

Preferably, the pressure-bearing structure comprises a force-sensitive resistor, and the force-sensitive resistor is provided with a circle along the circumferential direction of the shell.

Preferably, the electric grinder further comprises an indicator light, the indicator light is connected with the motor start-stop control structure, the output end of the indicator light is located within the sight range of a user, and when the motor of the electric grinder is in a rotating state, the indicator light can emit light.

Preferably, the indicator light comprises an LED light.

Preferably, the housing is provided with a lighting lamp, and the lighting lamp in a light-emitting state can illuminate the front of the housing cutter mounting structure.

Preferably, the lighting lamp is provided in plurality, and all the lighting lamps are uniformly distributed along the circumferential direction of the housing.

Preferably, the electric grinder further comprises a cutting tool, the cutting tool comprises a saw blade and a transmission structure, the saw blade is connected with the transmission structure, and when the transmission structure is connected with the tool mounting structure, an included angle exists between the axis of the saw blade and the axis of the shell.

Preferably, the transmission structure comprises a first bevel gear, a second bevel gear and a housing, the first bevel gear and the second bevel gear are both arranged in the transmission gear, and rotating shafts on the first bevel gear and the second bevel gear are respectively connected with the housing in a rotating manner; the first bevel gear is in transmission connection with the second bevel gear, a rotating shaft on the first bevel gear is connected with the saw blade, and a rotating shaft on the second bevel gear is connected with the cutter mounting structure.

Preferably, a handle is arranged on the shell.

Preferably, the handle is detachably connected to the housing.

The utility model discloses be provided with the motor on the electric mill and open and stop control structure and pressure-bearing structure, when the pressure value that pressure-bearing structure bore is greater than the default, the motor of electric mill has the electricity operation. When the pressure value that the pressure-bearing structure bore is less than the default, when the operator hand breaks away from the pressure-bearing structure promptly, the motor loses the electricity and stops the operation, and the security performance is high.

Drawings

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

FIG. 1 is a schematic view of a motor start/stop control structure of the electric grinder of the present invention;

FIG. 2 is an isometric view of the electric grinder of the present invention;

FIG. 3 is a partial cross-sectional view of the electric grinder of the present invention;

FIG. 4 is a functional diagram of the resistance value of the force-sensitive resistor of the electric grinder according to the present invention;

FIG. 5 is a wiring diagram of the force sensitive resistor, resistors and comparator of the electric grinder of the present invention;

FIG. 6 is a front view of the cutting tool of the electric grinder of the present invention;

fig. 7 is a plan view of the electric grinder of the present invention.

FIG. 1, a housing; 11. a hand-held area; 111. a pressure-bearing structure; 12. a cutter mounting structure; 13. an illuminating lamp; 14. a handle; 15. a motor; 2. cutting a cutter; 21. a saw blade; 22. a transmission structure; 23. a first bevel gear; 24. a second bevel gear; 25. a rotating shaft; 26. a housing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 3, the utility model provides an electric grinder, which comprises a pressure-bearing structure 111 and a motor start-stop control structure, wherein a holding area 11 is arranged on a shell 1 of the electric grinder, the pressure-bearing structure 111 is arranged on the surface of the holding area 11, and the pressure-bearing structure 111 can be pressed when the holding area 11 is held; the motor start-stop control structure is arranged in the shell 1, the bearing structure 111 and the motor 15 of the electric grinder are both connected with the motor start-stop control structure, and when the pressure value borne by the bearing structure 111 is larger than or smaller than a preset value, the motor start-stop control structure can control the motor 15 to start/stop. The utility model discloses it opens and stops control structure and pressure-bearing structure 111 to be provided with the motor on the electric mill, and when the pressure value that pressure-bearing structure 111 bore was greater than the default, the motor 15 of electric mill had the electricity operation. Pressure value that bears when pressure-bearing structure 111 is less than the default, promptly when the operator hand breaks away from pressure-bearing structure 111, the motor 15 loses the electricity and stops the operation to effectively promoted the utility model discloses security performance in the electric mill use.

Specifically, as shown in fig. 2 to 3, in the present embodiment, the pressure-bearing structure 111 includes a force-sensitive resistor, the force-sensitive resistor is the resistor Rx in fig. 1, 4, and 5, and hereinafter, the force-sensitive resistor is referred to as the force-sensitive resistor Rx. The force sensitive resistor Rx is provided with a circle along the circumferential direction of the grip region 11 on the housing 1, and in order to protect the force sensitive resistor, a flexible material may be provided outside the force sensitive resistor. As shown in fig. 1, the motor start/stop control structure includes a comparator LM393, a transistor 2N3055, a coupling relay module K (relay), and a plurality of resistors, and the connection mode of each component is explicitly shown in fig. 1. The principle that the motor start-stop control structure controls the start-stop of the motor 15 according to the magnitude of the pressure value borne by the force sensitive resistor Rx is described below.

In fig. 1, the motor 15 is the motor "M" in fig. 1, and for convenience of explanation of the circuit diagram, the motor 15 is hereinafter referred to as the motor M.

Referring to fig. 1 specifically, when the main switch SB is pressed, the circuit where the force sensitive resistor Rx and the comparator LM393 are located is powered on, and when the pressure borne by the force sensitive resistor Rx is greater than or equal to 0.5N, the comparator LM393 sends out a low level signal, and the low level signal can be transmitted to the coupling relay module K. At the moment, the coupling relay module K is driven by the power supply voltage to enable the NC-COM to be switched to the NO-COM, namely, the coupling relay module K is in a closed state. At this time, the current can flow through the coupling relay module K, the resistor R1 and the resistor R2 and be input into the transistor 2N3055 from the b end of the transistor 2N3055, so that the transistor 2N3055 is in an operating state under the stimulation of the current.

When the triode 2N3055 is in a working state, current flows from the positive electrode of the power supply through the motor M, the potentiometer RP and the resistor R3, finally flows into the triode from the C end of the triode 2N3055, flows out of the triode 2N3055 from the e end of the triode 2N3055 and flows through the resistor R7 until reaching the negative electrode of the power supply. At this time, the motor M is electrically operated.

When the hand of the user is taken off the force-sensitive resistor Rx during the operation of the motor M, i.e. when the hand of the user is separated from the force-sensitive resistor Rx, the pressure applied to the force-sensitive resistor Rx is 0(0<0.5N), and at this time, the comparator LM393 outputs a high level signal, which can be transmitted to the coupling relay module K. At this time, the coupling relay module K makes the NO-COM switch over the NC-COM under the driving of the power voltage, that is, the coupling relay module K is in an on state, and at this time, the current cannot pass through the coupling relay module K, so that NO current is input to the b end of the triode 2N3055, the triode 2N3055 is not in a working state, and further, the current cannot flow from the c end to the e end of the triode 2N3055, so that the circuit where the motor M is located is in an off state, and the motor M stops operating.

In summary, when the main switch SB is pressed and the force applied to the force-sensitive resistor Rx by the user's hand is greater than or equal to 0.5N, the voltage change is caused and the comparator LM393 outputs a low level. Then, the low level will drive COM of the coupling relay module K to be switched from NC to NO, so that the transistor 2N3055 is turned on, thereby driving the motor M to operate. When the hand of the user is taken down from the force-sensitive resistor Rx, namely the force applied to the force-sensitive resistor Rx by the hand of the user is less than 0.5N, the comparator LM393 outputs a high level, the high level switches the driving relay COM from NO to NC, the triode 2N3055 is not conducted, and the motor M stops running.

Obviously, the motor start/stop control structure in the present embodiment can change the operation state of the motor M according to the pressure value received by the force sensitive resistor Rx.

Further, the determination conditions for the comparator LM393 to output a low level and a high level are as follows:

FIG. 4 is a simplified diagram of the function of the force sensitive resistor Rx-F, where the resistance of the force sensitive resistor Rx is approximately 2000M Ω when the force sensitive resistor Rx is pressureless, gradually decreases when the force sensitive resistor Rx is pressurized, and where the resistance of the force sensitive resistor Rx is approximately 80K Ω when the force sensitive resistor Rx is 0.5N.

Referring to fig. 5, R4 is 2K Ω, R5 is 2K Ω, and R6 is 80K Ω.

In the figure, V_A＝(80KΩⅹVcc)/(80KΩ+Rx)，V_B＝Vcc/2，

When the force-sensitive resistor Rx approaches to 2000 MOmega, namely the force-sensitive resistor Rx is not pressurized or the pressure bearing capacity of the force-sensitive resistor Rx does not reach 0.5N, V_A＜V_BAt this time, the comparator LM393 outputs a high level, the b terminal of the transistor 2N3055 has no current input, the transistor 2N3055 is not turned on, and the motor M does not operate.

When the pressure F applied to the force-sensitive resistor Rx is more than or equal to 0.5N, the resistance value of the force-sensitive resistor Rx approaches to 80K omega and V_A≥V_BAt this time, the comparator LM393 outputs a low level, the end b of the transistor 2N3055 has a current input, the transistor 2N3055 is turned on, and the motor M is powered on to operate.

In this embodiment, preferably, the electric grinder further includes an indicator light, the indicator light is connected with the motor start-stop control structure, the output end of the indicator light is located in the sight range of a user, when the motor 15 of the electric grinder is in a rotating state, the indicator light can emit light, and the indicator light in a light-emitting state can remind the user that the motor M is in a running state.

As shown in fig. 1, the indicator light is HL in fig. 1, wherein the indicator light HL is disposed on a connection line between the comparator LM393 and the coupling relay module K, and when the transistor 2N3055 is in a conducting state, the indicator light HL emits light. When the triode 2N3055 is not conducted, the indicator lamp HL does not emit light.

Preferably, the indicator lamp HL comprises an LED lamp.

Preferably, as shown in fig. 2 to 3, the housing 1 is provided with an illumination lamp 13, and the illumination lamp 13 in a light-emitting state can illuminate the front of the cutter mounting structure 12 of the housing 1. In this embodiment, the illuminating lamp 13 is connected to the power supply through the switch, and when the user presses the switch, the illuminating lamp 13 is powered on to emit light, and the illuminating lamp 13 in the light-emitting state can illuminate the front of the cutter mounting structure 12, so as to play a role of auxiliary lighting, thereby facilitating the user to clearly see the state of the surface to be processed of the processed object.

Preferably, the illumination lamps 13 are provided in plural, and all the illumination lamps 13 are uniformly distributed in the circumferential direction of the housing 1.

Preferably, referring to fig. 6 to 7, in this embodiment, the electric grinder further includes a cutting tool 2, the cutting tool 2 includes a saw blade 21 and a transmission structure 22, the saw blade 21 is connected to the transmission structure 22, and when the transmission structure 22 is connected to the tool mounting structure 12, an included angle exists between an axis of the saw blade 21 and an axis of the housing 1.

Specifically, the transmission structure 22 includes a first bevel gear 23, a second bevel gear 24 and a housing 26, the first bevel gear 23 and the second bevel gear 24 are both disposed in the housing 26, wherein the rotating shafts 25 on the first bevel gear 23 and the second bevel gear 24 are respectively rotatably connected with the housing 26 through bearings. Specifically, the outer ring of the bearing is fixedly connected with the housing 26, and the inner ring of the bearing is fixedly connected with the rotating shaft 25 on the first bevel gear 23, or the inner ring of the bearing is fixedly connected with the rotating shaft 25 on the second bevel gear 24. And, the first bevel gear 23 and the second bevel gear 24 are in transmission connection, the rotating shaft 25 on the first bevel gear 23 is connected with the saw blade 21, and the rotating shaft 25 on the second bevel gear 24 is connected with the cutter mounting structure 12.

Preferably, after the cutting tool 2 is installed on the electric grinder, the included angle between the axis of the saw blade 21 and the axis of the housing 1 is 90 degrees.

Preferably, a handle 14 is arranged on the housing 1, and the handle 14 is detachably connected with the housing 1, wherein the detachable connection mode comprises a screw connection or a clamping connection.

In the present embodiment, the cutting tool 2 is used as follows:

the shaft 25 on the second bevel gear 24 is connected to the tool mounting structure 12 and the motor is then operated by holding the housing 1 in one hand and the force sensitive resistor Rx on the grip region 11 in the other hand. The grinder is then rotated so that the axis of the saw blade 21 is parallel to the horizontal plane, at which point the rotating saw blade 21 can be used to cut the object to be worked. Or, the electric grinder is rotated to make the axis of the saw blade 21 perpendicular to the horizontal plane, and then, the end of the electric grinder away from the saw blade 21 is slightly lifted to make a smaller included angle exist between the saw blade 21 and the horizontal plane, at this time, the rotating saw blade 21 can be used for grinding off the area with the wrong painting on the oil painting paper or the water color paper. However, when grinding the area of the paper with the wrong picture, the saw blade 21 with a small diameter and a small number of teeth should be selected.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An electric grinder is characterized by comprising a pressure bearing structure (111) and a motor start-stop control structure, wherein,

a shell (1) of the electric grinder is provided with a holding area (11), the pressure-bearing structure (111) is arranged on the surface of the holding area (11), and the pressure-bearing structure (111) can be pressed when the holding area (11) is held; the motor start-stop control structure is arranged in the shell (1), the pressure bearing structure (111) and the motor (15) of the electric grinder are connected with the motor start-stop control structure, and when the pressure value borne by the pressure bearing structure (111) is larger than or smaller than a preset value, the motor start-stop control structure can control the motor (15) to start/stop.

2. An electric grinding machine according to claim 1, characterized in that the pressure-bearing structure (111) comprises a force-sensitive resistor, which is provided with a turn in the circumferential direction of the housing (1).

3. An electric grinder as claimed in claim 1, characterised in that it also comprises an indicator light connected to the motor start-stop control structure and having an output positioned in the line of sight of the user, the indicator light being able to illuminate when the motor (15) of the grinder is in rotation.

4. An electric grinder as claimed in claim 3, characterised in that the indicator light comprises an LED light.

5. An electric grinder as claimed in claim 1, characterised in that an illumination lamp (13) is provided on the housing (1), the illumination lamp (13) in the illuminated state being able to illuminate the front of a tool mounting structure (12) on the housing (1).

6. An electric grinder as claimed in claim 5, characterised in that said lighting lamps (13) are provided in plurality, all said lighting lamps (13) being uniformly distributed along the circumferential direction of said housing (1).

7. The electric grinding machine according to claim 5, characterized in that the electric grinding machine further comprises a cutting tool (2), the cutting tool (2) comprising a saw blade (21) and a transmission structure (22), the saw blade (21) being connected with the transmission structure (22), when the transmission structure (22) is connected with the tool mounting structure (12), an included angle is formed between the axis of the saw blade (21) and the axis of the housing (1).

8. The electric grinder according to claim 7, wherein the transmission structure (22) comprises a first bevel gear (23), a second bevel gear (24) and a housing (26), the first bevel gear (23) and the second bevel gear (24) are both arranged in the transmission gear, and the rotating shafts (25) on the first bevel gear (23) and the second bevel gear (24) are respectively connected with the housing (26) in a rotating manner; the first bevel gear (23) is in transmission connection with the second bevel gear (24), a rotating shaft (25) on the first bevel gear (23) is connected with the saw blade (21), and a rotating shaft (25) on the second bevel gear (24) is connected with the cutter mounting structure (12).

9. An electric grinder as claimed in claim 1, characterised in that a handle (14) is provided on the housing (1).

10. An electric grinder as claimed in claim 9, characterised in that the handle (14) is removably connected to the housing (1).