Tool sharpener convenient and fast to use

Abstract

The utility model discloses a convenient knife grinder, which comprises a shell, a motor, a main shaft and a knife stone, the motor is arranged in the shell, the main shaft is arranged on the motor, the knife stone is arranged on the main shaft, the shell is provided with a circuit board and a switch button, the circuit board is provided with a driving circuit, a conductive sheet and a conductive elastic sheet, and the conductive elastic sheet is arranged on the circuit board. The conducting strip is electrically connected with the driving circuit; the conductive elastic sheet comprises a fixed section and a bent section, the fixed section is electrically connected with the driving circuit, the bent section faces the switch button, and the switch button drives the bent section to be electrically connected with the conductive sheet. The switch button of the tool sharpener can be triggered and disconnected instantaneously, the temperature of a tool sharpening area can be controlled by frequently operating the switch button, the annealing phenomenon of a tool is avoided, and meanwhile the drive circuit is additionally provided with an over-current protector to prevent the circuit from being burnt out by over-current during grinding.

Description

Technical Field

[0001] The utility model relates to the technical field of electric knife sharpening, in particular to a convenient knife sharpening machine. Background Art

[0002] A knife sharpener is a general term for tools that sharpen knives. An electric knife sharpener uses electricity to drive a motor to rotate, thereby driving the grindstone on the motor shaft to sharpen the knife edge.

[0003] A small, portable knife sharpener is a good helper for household kitchen utensils. When the edge of a kitchen knife becomes dull, it only takes a few seconds to sharpen the knife again, without having to buy a new knife or use a whetstone to sharpen the knife in a time-consuming and laborious manner.

[0004] Electric knife sharpeners have been invented for many years, and manufacturers are still constantly improving them to make them convenient and safe. For example, the Chinese patent with announcement number CN220944433U has a support frame to fix the protective rod on one side of the knife sharpening shell to limit the knife and prevent the knife from scratching the knife sharpening shell during the sharpening process. For example, the Chinese patent with announcement number CN210756779U has a built-in battery, and the entire device works at a safe voltage of 5V, which improves the reliability of the device. Moreover, it does not need to be plugged in when in use, and is not restricted by sockets and power cords, which improves the practicality of the device.

[0005] However, after the electric knife sharpener is turned on, the motor will continue to drive the whetstone to rotate until the switch is pressed again to turn off the sharpener. When the electric knife sharpener is used to sharpen the knife for a long time, a large amount of heat will be generated, which will increase the temperature of the sharpening area and cause annealing of the knife. Utility Model Content

[0006] The purpose of the utility model is to provide a convenient knife sharpener. The switch button of the knife sharpener can be triggered and disconnected instantly. The temperature of the knife sharpening area can be controlled by frequently operating the switch button to avoid annealing of the knife. At the same time, an overcurrent protector is added to the driving circuit to avoid overcurrent during grinding and burning the circuit.

[0007] The above technical purpose of the utility model is achieved through the following technical solutions: a convenient knife sharpener, including a shell, a motor, a spindle and a whetstone, the motor is arranged in the shell, the spindle is arranged on the motor, the whetstone is arranged on the spindle, the shell is provided with a circuit board and a switch button, the circuit board is provided with a drive circuit, a conductive sheet and a conductive spring sheet, the conductive sheet is electrically connected to the drive circuit; the conductive spring sheet includes a fixed section and a bending section, the fixed section is electrically connected to the drive circuit, the bending section is arranged facing the switch button, and the switch button pushes the conductive spring sheet to electrically connect with the conductive sheet.

[0008] By adopting the above technical solution, by pressing the switch button, the switch button presses the bent section of the conductive spring sheet, so that the conductive sheet and the conductive spring sheet are electrically connected, the drive circuit turns on the power supply motor, and the knife sharpener starts sharpening; when the switch button is released, the conductive sheet and the conductive spring sheet are separated, the motor stops rotating, and the knife sharpening stops, so that the knife sharpening and the stop sharpening can be quickly switched.

[0009] The utility model is further configured as follows: the bending section is bent to form an included angle, and the included angle is between 30° and 150°.

[0010] The utility model is further configured as follows: a resisting portion is provided on the side of the bending section facing the conductive sheet.

[0011] By adopting the above technical solution, the abutment portion reduces the arc sparking phenomenon when the conductive sheet and the conductive spring sheet are disconnected.

[0012] The utility model is further configured as follows: the switch button comprises a button cover, a spring and a top plate, the button cover is movably arranged on the housing, the spring is placed between the button cover and the housing, and the top plate is arranged at the end of the button cover.

[0013] The utility model is further configured as follows: the switch button is arranged on the side of the shell, and the circuit board in the shell is arranged opposite to the switch button.

[0014] The utility model is further configured as follows: two side surfaces of the shell are provided with concave surfaces, and the switch button is arranged on the concave surfaces.

[0015] The utility model is further configured as follows: the driving circuit includes an RC filter circuit, a rectifier circuit and a differential mode inductor filter circuit; the input end of the RC filter circuit is connected to alternating current, the output end of the RC filter circuit is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the differential mode inductor filter circuit, and the differential mode inductor filter circuit is connected to the driving motor.

[0016] The utility model is further configured as follows: the RC filter circuit includes a capacitor C1, a resistor R1, and a resistor R2. The capacitor C1 is connected in parallel with the resistor R1, and the resistor R1 is connected in series with the resistor R2.

[0017] The utility model is further configured as follows: the rectifier circuit is a rectifier bridge composed of diodes D1, D2, D3, and D4; the differential mode inductor filter circuit includes common mode inductors L1 and L2, and the common mode inductors L1 and L2 are connected to the positive and negative ends of the motor respectively.

[0018] The utility model is further configured as follows: the driving circuit further includes an overcurrent protector FR, and the overcurrent protector FR is connected to the RC filter circuit.

[0019] Compared with the prior art, the utility model has the following beneficial effects: the switch button of the knife sharpener can be triggered and disconnected instantly, the temperature of the knife sharpening area can be controlled by frequently operating the switch button to avoid annealing of the knife, and at the same time, an overcurrent protector is added to the drive circuit to prevent overcurrent from burning the circuit during grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 2 is a three-dimensional view of the knife sharpener in the embodiment.

[0021] Figure 2 2 is a transverse cross-sectional view of the knife sharpener in the embodiment.

[0022] Figure 3 is an internal view of the knife sharpener in the embodiment.

[0023] Figure 4 2 is a vertical sectional view of the knife sharpener in the embodiment.

[0024] Figure 5 2. It is a view of a circuit board in a knife sharpener in an embodiment.

[0025] Figure 6 2. It is a view of a conductive spring in a knife sharpener in an embodiment.

[0026] Figure 7 1 is a circuit diagram of the knife sharpener in the embodiment.

[0027] In the figure: 100, housing; 101, concave surface; 200, motor; 300, spindle; 400, whetstone; 500, circuit board; 501, conductive sheet; 502, conductive spring; 503, fixed section; 504, bending section; 505, resistance part; 506, angle; 600, switch button; 601, button cover; 602, spring; 603, top plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0029] like Figure 1-6As shown, this embodiment discloses a convenient knife sharpener, including a shell 100, a motor 200, a spindle 300 and a whetstone 400. The motor 200 is fixedly arranged in a bracket of the shell 100, the spindle 300 is arranged on the rotating shaft of the motor 200, the motor 200 drives the spindle 300 to rotate, and the whetstone 400 is fixedly arranged on the spindle 300 and grinds the tool as the spindle 300 rotates.

[0030] A circuit board 500 and a switch button 600 are disposed on the housing 100 . The circuit board 500 is provided with a driving circuit. The switch button 600 starts the driving circuit to drive the motor 200 to rotate the grinding tool.

[0031] like Figure 5 As shown, a conductive sheet 501 and a conductive spring sheet 502 are provided on the circuit board 500. The conductive sheet 501 and the conductive spring sheet 502 are respectively electrically connected to the driving circuit. When the conductive sheet 501 and the conductive spring sheet 502 are in contact and connected, the driving circuit forms a complete closed loop to drive the motor 200 to rotate.

[0032] like Figure 5 , 6 As shown, the conductive sheet 501 is fixed on the circuit board 500 and electrically connected to the driving circuit. The conductive spring 502 is a conductive metal sheet, which is divided into a fixed section 503 and a bent section 504. The fixed section 503 is arranged on the circuit board 500 in parallel with the conductive sheet 501 and is electrically connected to the driving circuit. One side of the fixed section 503 is folded and extends toward the conductive sheet 501 to form a bent section 504. The bent section 504 is bent as a whole to form an angle 506, and the angle 506 is between 30° and 150°; the bent section 504 is provided with a resistance portion 505 on the side facing the conductive sheet 501, and the resistance portion 505 is arranged in a cone shape with an arc surface at the top to reduce the electric spark generated when the connection is disconnected.

[0033] like Figure 3 As shown, a switch button 600 is arranged above the angle 506 of the bending section 504, and the switch button 600 is arranged on the housing 100. The switch button 600 includes a button cover 601, a spring 602 and a top plate 603. The button cover 601 is movably arranged on the housing 100, and the spring 602 is placed between the button cover 601 and the housing 100 and abuts against the button cover 601 and the housing 100 respectively. The spring 602 provides a rebound force for the button cover 601 to reset. The top plate 603 is fixed to the button cover 601 by screws on the inner side of the housing 100 and moves with the button cover 601. The button cover 601 is pressed to move toward the inner side of the housing 100, and the top plate 603 moves accordingly to press the bending section 504, so that the bending section 504 of the conductive spring sheet 502 is electrically connected to the conductive sheet 501, so that the conductive spring sheet 502 is electrically connected to the conductive sheet 501, the driving circuit is turned on, the motor 200 rotates, and the tool is polished.

[0034] like Figure 1 As shown, it is convenient for the user to hold the knife sharpener tightly to start the knife sharpener. The knife sharpener housing 100 is respectively designed with arc-shaped concave surfaces 101, and the switch button 600 is arranged in the arc-shaped concave surfaces 101. When operating the knife sharpener, the user can hold the knife sharpener tightly with the left hand through the arc-shaped concave surface 101, hold the tool with the right hand and place the tool in the grinding groove, and press the switch button 600 with the left thumb to start grinding the tool. The thumb can be released at any time during the grinding process. The switch button 600 is reset under the elastic force of the spring 602, the conductive spring sheet 502 and the conductive sheet 501 are separated, and the motor 200 stops rotating, so that the temperature of the tool edge is cooled down. Such repeated operations can control the temperature of the tool edge during grinding and avoid tool annealing.

[0035] During the grinding process of the tool, jamming or stalling may occur, which may cause overcurrent in the circuit and burn out the circuit or the motor 200. The knife sharpener in this embodiment also has improvements on the circuit.

[0036] like Figure 7 As shown, the driving circuit converts AC power into DC power to drive the motor 200 to rotate. The driving circuit includes an RC filter circuit for AC filtering, a rectifier circuit for converting AC power into DC power, and a differential mode inductor filter circuit for DC filtering; the input end of the RC filter circuit is connected to the AC power, the output end of the RC filter circuit is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the differential mode inductor filter circuit, and the differential mode inductor filter circuit is connected to the motor 200.

[0037] The RC filter circuit includes a capacitor C1, a resistor R1, and a resistor R2. The capacitor C1 is connected in parallel with the resistor R1, and the resistor R1 is connected in series with the resistor R2. The rectifier circuit is a rectifier bridge composed of diodes D1, D2, D3, and D4. The differential mode inductor filter circuit includes a common mode inductor L1 and a common mode inductor L2. The input end of the common mode inductor L1 is connected to the positive output end of the rectifier bridge, and the output end of the common mode inductor L1 is connected to the positive end of the motor 200. The input end of the common mode inductor L2 is connected to the negative output end of the rectifier bridge, and the output end of the common mode inductor L1 is connected to the negative end of the motor 200.

[0038] In order to prevent overcurrent, an overcurrent protector FR is connected to the RC filter circuit. When overcurrent occurs in the circuit, the overcurrent protector FR switches the circuit to protect the circuit.

[0039] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A convenient knife sharpener, comprising a housing (100), a motor (200), a spindle (300) and a whetstone (400), wherein the motor (200) is arranged in the housing (100), the spindle (300) is arranged on the motor (200), and the whetstone (400) is arranged on the spindle (300), and wherein: The housing (100) is provided with a circuit board (500) and a switch button (600); the circuit board (500) is provided with a driving circuit, a conductive sheet (501) and a conductive spring sheet (502); the conductive sheet (501) is electrically connected to the driving circuit; the conductive spring sheet (502) comprises a fixed section (503) and a bent section (504); the fixed section (503) is electrically connected to the driving circuit; the bent section (504) is arranged facing the switch button (600); the switch button (600) pushes the conductive spring sheet (502) to be electrically connected to the conductive sheet (501).

2. A convenient knife sharpener according to claim 1, characterized in that: The bending section (504) is bent to form an angle (506), and the angle (506) is between 30° and 150°.

3. A convenient knife sharpener according to claim 2, characterized in that: The side of the bending section (504) facing the conductive sheet (501) is provided with a resisting portion (505).

4. A convenient knife sharpener according to claim 1, characterized in that: The switch button (600) comprises a button cover (601), a spring (602) and a top plate (603); the button cover (601) is movably arranged on a housing (100); the spring (602) is placed between the button cover (601) and the housing (100); and the top plate (603) is arranged at the end of the button cover (601).

5. A convenient knife sharpener according to claim 4, characterized in that: The switch button (600) is arranged on a side surface of the housing (100), and the circuit board (500) in the housing (100) is arranged opposite to the switch button (600).

6. A convenient knife sharpener according to claim 5, characterized in that: Concave surfaces (101) are provided on two side surfaces of the housing (100), and the switch button (600) is arranged on the concave surfaces (101).

7. A convenient knife sharpener according to claim 1, characterized in that: The driving circuit comprises an RC filter circuit, a rectifier circuit and a differential mode inductor filter circuit; the input end of the RC filter circuit is connected to alternating current, the output end of the RC filter circuit is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the differential mode inductor filter circuit, and the differential mode inductor filter circuit is connected to a motor (200).

8. A convenient knife sharpener according to claim 7, characterized in that: The RC filter circuit includes a capacitor C1, a resistor R1, and a resistor R2. The capacitor C1 is connected in parallel with the resistor R1, and the resistor R1 is connected in series with the resistor R2.

9. A convenient knife sharpener according to claim 8, characterized in that: The rectifier circuit is a rectifier bridge composed of diodes D1, D2, D3 and D4; the differential mode inductor filter circuit comprises common mode inductors L1 and L2, and the common mode inductors L1 and L2 are respectively connected to the positive and negative ends of the motor (200).

10. A convenient knife sharpener according to claim 9, characterized in that: The driving circuit further includes an overcurrent protector FR, and the overcurrent protector FR is connected to the RC filter circuit.

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