CN108818166B

CN108818166B - Knife sharpener

Info

Publication number: CN108818166B
Application number: CN201810712476.6A
Authority: CN
Inventors: 徐守聪
Original assignee: Chongqing Kaizhou District Sanzhong Printing Co ltd
Current assignee: Chongqing Kaizhou District Sanzhong Printing Co ltd
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2020-07-14
Anticipated expiration: 2038-06-29
Also published as: CN108818166A

Abstract

The invention belongs to the technical field of knife grinding devices, and particularly discloses a knife grinder which comprises a rack, a grinding unit, a transmission unit and a clamping unit, wherein the clamping unit comprises a mounting seat, a rotating shaft and a motor; the polishing unit comprises a communication column and an adjusting mechanism, a first piston is connected to one side of the communication column in a sliding mode, a first plunger is connected to the first piston in a rotating mode, a second piston is connected to the other side of the communication column in a sliding mode, a second plunger is connected to the second piston in a rotating mode, and grinding wheels are fixed to the first plunger and the second plunger; a first gear barrel is fixed on the first plunger, and a first gear is fixed on the second plunger; the transmission unit comprises a transmission shaft which is rotationally connected to the rack, and an output gear meshed with the first gear cylinder and a second gear cylinder meshed with the first gear cylinder are fixed on the transmission shaft; a third gear barrel meshed with the first gear is fixed on the rotating shaft. The knife sharpener disclosed by the invention is used for polishing the circular blade, so that the cutting edges on two surfaces of the circular blade can be simultaneously polished, and the working efficiency is improved.

Description

Knife sharpener

Technical Field

The invention belongs to the technical field of knife grinding devices, and particularly relates to a knife grinder.

Background

The knife sharpener is used for trimming the blade, compared with the blade obtained by manual sharpening, the service strength of the blade is increased, the service life of the blade and the processing capacity of the blade are correspondingly improved, and therefore the knife sharpener is an essential special device for industries such as printing, papermaking, packaging, plastic leather, woodworking and the like. After the blade works for a long time, the sharpness of the blade point is reduced or the blade is abraded, so the blade needs to be sharpened again, and different machine types can be selected according to the type and the size of the blade to sharpen the blade.

The circular blade sharpener is one of sharpeners and is used for automatic sharpening processing of various circular blades, the structure of the existing circular blade sharpener generally comprises a rack, a grinding wheel and two motors, the two motors and the grinding wheel are both installed on the rack, one motor is used for controlling the rotation of the grinding wheel, and the other motor is used for controlling the rotation of the circular blade to be sharpened. The existing knife sharpener has simple structure and easy operation, but also has the following defects: the existing knife sharpener can only grind the edge of one side of the circular blade every time, after the edge of one side of the circular blade is ground, the circular blade needs to be detached from the rack, turned over one side and then installed again, and then the edge of the other side needs to be ground, so that the operation is troublesome, and the processing efficiency is reduced.

Disclosure of Invention

The invention aims to provide a knife sharpener which can simultaneously sharpen the cutting edges of two surfaces of a circular blade and improve the machining efficiency.

In order to achieve the purpose, the basic scheme of the invention is as follows: the knife sharpener comprises a stander, a grinding unit, a transmission unit and a clamping unit for fixing a circular blade, wherein the clamping unit comprises a mounting seat, a rotating shaft fixedly connected with the mounting seat and a motor for driving the rotating shaft to rotate; the polishing unit comprises a communication column and an adjusting mechanism, wherein a transmission medium is filled in the communication column, the adjusting mechanism is used for adjusting the pressure in the communication column, a first piston is connected to one side of the communication column in a sliding manner, a first plunger is connected to the first piston in a rotating manner, a second piston is connected to the other side of the communication column in a sliding manner, a second plunger opposite to the first plunger is connected to the second piston in a rotating manner, and grinding wheels used for polishing the cutting edge of the circular blade are arranged on the first plunger and the second plunger; a first gear barrel is fixed on the first plunger, and a first gear is fixed on the second plunger; the transmission unit comprises a transmission shaft which is rotationally connected to the rack, and an output gear meshed with the first gear cylinder and a second gear cylinder meshed with the first gear cylinder are fixed on the transmission shaft; a third gear barrel meshed with the first gear is fixed on the rotating shaft.

The working principle of the basic scheme is as follows: when the circular blade is polished, the circular blade is fixed by the clamping mechanism, the pressure in the communicating column is changed by the adjusting mechanism, the first piston and the second piston drive the grinding wheels to move to one side of the circular blade through the first plunger and the second plunger, and the adjusting mechanism stops operating until the two grinding wheels are respectively contacted with the cutting edges on the two surfaces of the circular blade. The motor is started, the motor drives the circular blade to rotate together through the rotating shaft and the mounting seat, the third gear barrel on the rotating shaft drives the grinding wheel on the second plunger to rotate in a gear transmission mode, the first gear on the second plunger drives the grinding wheel on the first plunger to rotate through the transmission unit, namely, when the circular blade rotates, the two grinding wheels also rotate, the two grinding wheels respectively polish the positions of the two side edges of the circular blade, and after polishing is completed, the motor is turned off.

The beneficial effect of this basic scheme lies in: the knife sharpener is used for grinding the circular blade, the cutting edges on two surfaces of the circular blade can be ground simultaneously, the circular blade is only required to be mounted and dismounted once, the grinding process flow is simplified, and the processing efficiency is improved.

Furthermore, cavities are formed in the first plunger and the second plunger, a first push rod is connected in the cavity of the first plunger in a sliding mode, a second push rod is connected in the cavity of the second plunger in a sliding mode, a first tension spring is connected between the first push rod and the first plunger, and a second tension spring is connected between the second push rod and the second plunger; the two grinding wheels are respectively fixed on the first push rod and the second push rod; a magnet is fixed in the grinding wheel of the first push rod, and an electromagnet is fixed in the grinding wheel of the second push rod.

When the circular blade is polished, the power supply of the electromagnet is switched on, attraction is generated between the electromagnet and the magnet, the grinding wheel on the second push rod is tightly attached to the blade on the surface of one side of the circular blade, and the grinding wheel on the first push rod is tightly attached to the blade on the surface of the other side of the circular blade. In the process of polishing the cutting edge of the circular blade, the cutting edge of the circular blade becomes thin, but under the action of the attraction force of the electromagnet and the magnet, the two grinding wheels are always attached to the cutting edge of the circular blade, and the cutting edge of the circular blade can be polished by the grinding wheels. Through setting up structures such as electro-magnet, first push rod and second push rod, need not carry out very accurate regulation to the position of emery wheel and also can ensure the emery wheel and the cutting edge contact of circle blade, make the emery wheel can be normal polish to the cutting edge of circle blade.

And the control unit comprises a single control switch for controlling the electromagnet to be powered off, the transmission shaft is in threaded connection with a nut which can only move along the radial direction of the transmission shaft, and a pressing block which can apply pressure to the single control switch is fixed on the nut. The during operation transmission shaft of sharpedge grinding machine takes place to rotate toward fixed direction, because nut and transmission shaft threaded connection, at this in-process, the nut is close to single control switch one side motion along the transmission axial, briquetting and single control switch contact on the nut and when exerting pressure to single control switch, single control switch control electro-magnet outage, the electro-magnet loses magnetism and no longer attracts mutually with magnet, at this moment at first extension spring, under the effect of second extension spring, first push rod, the second push rod drives the emery wheel to keeping away from disc blade one side motion, the emery wheel no longer polishes the disc blade. Through setting up above-mentioned structure, need not the workman constantly to pay attention to the condition that the circular knife piece polished in order to avoid the emery wheel to polish excessively to the circular knife piece.

Furthermore, a limiting rod with one side penetrating through the nut is fixed on the rack. The arrangement of the limiting rod effectively limits the movement of the nut, so that the nut can only move up and down along the radial direction of the transmission shaft.

Further, the adjusting mechanism comprises a first annular cylinder and a second annular cylinder which are both communicated with the communicating column, and the area of the section of the first annular cylinder is 4-8 times that of the section of the second annular cylinder; the inner walls of the first annular cylinder and the second annular cylinder are provided with threads, a first pressing plate is connected with the first annular cylinder through threads, a second pressing plate is connected with the second annular cylinder through threads, a first handle is fixed on the first pressing plate, and a second handle is fixed on the second pressing plate. The position of the grinding wheel can be adjusted by adjusting the position of the first pressing plate or the second pressing plate, when the position of the grinding wheel needs to be adjusted by a large margin, the first handle is rotated to enable the first pressing plate to move along the first annular cylinder, the first pressing plate drives the first piston and the second piston to move by changing the pressure intensity of a transmission medium, and the positions of the grinding wheel are adjusted by the first piston and the second piston through the first plunger and the second plunger. When the position of the grinding wheel needs to be adjusted in a small range, the second handle is rotated to enable the second pressing plate to move along the second annular cylinder.

Furthermore, a positioning rod capable of penetrating through the through hole of the circular blade is fixed on the mounting seat, and a positioning block is connected to the positioning rod through threads. When the circular blade is fixed, the circular blade is placed on the mounting seat, the positioning rod penetrates through the through hole of the mounting seat, then the positioning block is sleeved on the positioning rod, the positioning block is screwed until the positioning block is in close contact with the circular blade, and the circular blade is clamped and fixed at the moment.

Drawings

Fig. 1 is a cross-sectional view of an embodiment of the knife sharpener of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

the reference numbers in figure 1 of the specification include: the device comprises a communication column 10, a transmission shaft 20, an output gear 21, a second gear cylinder 22, a nut 23, a pressing block 231, a limiting rod 24, a single-control switch 25, a motor 30, a rotating shaft 31, a mounting seat 32, a positioning block 33, a third gear cylinder 34, a circular blade 40, a second plunger 50, a second piston 51, a second push rod 52, a second tension spring 53, a first gear 54, an electromagnet 55, a first plunger 60, a first piston 61, a first push rod 62, a first gear cylinder 63, a first tension spring 64, a grinding wheel 65, a magnet 66, a second annular cylinder 70, a second pressing plate 71, a second handle 72, a first annular cylinder 80, a first pressing plate 81 and a first handle 82.

As shown in fig. 1, the knife sharpener comprises a frame, a polishing unit, a transmission unit, a control unit and a clamping unit, wherein the clamping unit comprises a mounting seat 32, a rotating shaft 31 and a motor 30, a positioning rod capable of passing through a through hole of a circular blade 40 is fixed on the mounting seat 32, a positioning block 33 is connected to the positioning rod in a threaded manner, and the positioning rod is used for fixing the circular blade 40 on the mounting seat 32. The motor 30 is fixed on the frame, the output shaft of the motor 30 is fixedly connected with the lower end of the rotating shaft 31, the upper end of the rotating shaft 31 is welded on the lower surface of the mounting seat 32, and the rotating shaft 31 is coaxial with the positioning rod. The motor 30 is started, and the motor 30 can drive the circular blade 40 on the mounting seat 32 to rotate together through the rotating shaft 31.

The unit of polishing is located the right side of clamping unit, and the unit of polishing is equipped with transmission medium including intercommunication post 10 and adjustment mechanism in the intercommunication post 10, and transmission medium is hydraulic oil in this embodiment. Slide and sealing connection in one side of intercommunication post 10 has first piston 61, and it is connected with first plunger 60 to rotate on first piston 61, and specific connected mode is: the lower surface of the first piston 61 is provided with a first rotating groove with a T-shaped section, and the first plunger 60 is rotatably connected to the first piston 61 through the first rotating groove; the other side of the communication column 10 slides in and is connected with a second piston 51 in a sealing way, the second piston 51 is connected with a second plunger 50 opposite to the first plunger 60 in a rotating way, and the specific connection mode is as follows: the second piston 51 has a second rotation groove formed in an upper surface thereof and having a T-shaped cross section, and the second plunger 50 is rotatably coupled to the second piston 51 through the second rotation groove. Cavities are formed in the first plunger piston 60 and the second plunger piston 50, a first push rod 62 is connected in the cavity of the first plunger piston 60 in a sliding mode, and a first tension spring 64 is connected between the first push rod 62 and the inner wall of the first plunger piston 60; the inner wall of the first plunger 60 is provided with a first strip-shaped groove, the first push rod 62 is fixed with a first clamping strip clamped with the first strip-shaped groove, and the relative rotation of the first plunger 60 and the first push rod 62 is limited by the arrangement of the first strip-shaped groove and the first clamping strip. A second push rod 52 is connected in the cavity of the second plunger 50 in a sliding manner, and a second tension spring 53 is connected between the second push rod 52 and the inner wall of the second plunger 50; the inner wall of the second plunger 50 is provided with a second strip-shaped groove, a second clamping strip clamped with the second strip-shaped groove is fixed on the second push rod 52, and the second strip-shaped groove and the second clamping strip are arranged to limit the relative rotation of the second plunger 50 and the second push rod 52. A first gear barrel 63 is fixed to the first plunger 60, and a first gear 54 is fixed to the second plunger 50. The grinding wheels 65 used for grinding the cutting edges of the circular blades are welded at the ends, far away from the communication column 10, of the first push rod 62 and the second push rod 52, the two grinding wheels 65 are arranged oppositely, and the circular blades 40 are fixed on the mounting base 32 and then located in the middle between the two grinding wheels 65. A magnet 66 is fixed in the grindstone 65 of the first push rod 62, an electromagnet 55 is fixed in the grindstone 65 of the second push rod 52, and the electromagnet 55 is energized to generate magnetism attracting the magnet 66.

The adjusting mechanism comprises a first annular cylinder 80 and a second annular cylinder 70 which are both communicated with the communication column 10, the area of the cross section of the first annular cylinder 80 is 4-8 times that of the second annular cylinder 70, and in the embodiment, the area of the cross section of the first annular cylinder 80 is 4 times that of the second annular cylinder 70. The inner walls of the first annular cylinder 80 and the second annular cylinder 70 are both provided with threads, the first annular cylinder 80 is connected with a first pressing plate 81 through internal threads, the second annular cylinder 70 is connected with a second pressing plate 71 through internal threads, a first handle 82 is welded at the center of the first pressing plate 81, and a second handle 72 is welded at the center of the second pressing plate 71.

The transmission unit comprises a transmission shaft 20 which is rotatably connected to the frame, an output gear 21 which is meshed with the first gear cylinder 63 and a second gear cylinder 22 which is meshed with the first gear 54 are fixed on the transmission shaft 20, and a third gear cylinder 34 which is meshed with the first gear 54 is fixed on the rotating shaft 31. The first gear barrel 63, the second gear barrel 22 and the third gear barrel 34 are similar to the common gear in structure, and are different from the common gear in that the first gear barrel 63 is thicker than the common gear in thickness, so that the first gear barrel 63 is always meshed with the output gear 21 when the first gear barrel 63 moves up and down along with the first plunger 60, and the second gear is always meshed with the second gear barrel 22 and the third gear barrel 34 when the first gear 54 moves up and down along with the second plunger 50.

The control unit comprises a single control switch 25 (the single control switch 25 can be purchased on the market) for controlling the electromagnet 55 to be powered off, a nut 23 is connected to the transmission shaft 20 in a threaded manner, a limiting rod 24 with one side penetrating through the nut 23 is fixed on the rack, and the movement of the nut 23 is limited by the arrangement of the limiting rod 24, so that the nut 23 can only move along the axial direction of the transmission shaft 20. A pressing block 231 opposite to the single control switch 25 is fixed on the nut 23, when the pressing block 231 moves to a fixed position, the pressing block 231 can press the single control switch 25, and at the moment, the single control switch 25 controls the electromagnet 55 to be powered off.

The specific implementation process is as follows: when the circular blade 40 needs to be polished, the first handle 82 is rotated in the fixed direction to enable the first pressing plate 81 to move towards the side far away from the first annular cylinder 80, the pressure in the communicating column 10 is reduced, under the action of external air pressure, the first piston 61 and the second piston 51 both move towards the side far away from the mounting table, and the two grinding wheels 65 also move towards the side far away from the mounting table. When the grinding wheel 65 moves to a position where the installation of the circular blade 40 is not affected, the first handle 82 stops rotating, the circular blade 40 is placed on the installation seat 32, the positioning rod penetrates through the through hole of the installation seat 32, then the positioning block 33 is sleeved on the positioning rod, the positioning block 33 is screwed until the positioning block 33 is in close contact with the circular blade 40, and at the moment, the circular blade 40 is clamped and fixed. The first handle 82 is rotated again, so that the first pressure plate 81 moves towards one side of the first annular cylinder 80, the first pressure plate 81 extrudes the hydraulic oil in the communicating column 10, the hydraulic oil drives the grinding wheels 65 to move towards one side of the circular blade 40 through the first piston 61 and the second piston 51, and the first handle 82 stops rotating when the two grinding wheels 65 are respectively about to contact with the cutting edges on the two surfaces of the circular blade. When the power of the electromagnet 55 is turned on, an attractive force is generated between the electromagnet 55 and the magnet 66, the electromagnet 55 enables the second push rod 52 to move towards the lower surface side of the circular blade 40 against the pulling force of the second tension spring 53, the grinding wheel 65 on the second push rod 52 is tightly attached to the cutting edge on the lower surface of the circular blade 40, the magnet 66 enables the first push rod 62 to move towards the upper surface side of the circular blade 40 against the pulling force of the first tension spring 64, and the grinding wheel 65 on the first push rod 62 is tightly attached to the cutting edge on the upper surface of the circular blade 40. The motor 30 is started, the motor 30 drives the circular blade 40 to rotate together through the rotating shaft 31 and the mounting seat 32, the third gear cylinder 34 on the rotating shaft 31 drives the second plunger 50 and the grinding wheel 65 on the second plunger 50 to rotate through the first gear 54, because the first gear 54 is meshed with the second gear cylinder 22 on the transmission shaft 20, the first gear 54 also drives the transmission shaft 20 and the output gear 21 on the transmission shaft 20 to rotate through the second gear cylinder 22, the output gear 21 drives the grinding wheel 65 on the first plunger 60 to rotate through the first gear cylinder 63, namely, when the circular blade 40 rotates, the two grinding wheels 65 also rotate, and the two grinding wheels 65 grind positions of edges on two surfaces of the circular blade 40 respectively.

In the process of grinding the edge of the circular blade 40, the edge of the circular blade 40 becomes thin, and under the action of the attraction force of the electromagnet 55 and the magnet 66, the two grinding wheels 65 are always attached to the edge of the circular blade 40, so that the grinding wheels 65 can grind the edge of the circular blade 40. Meanwhile, because the rotating shaft 31 continuously rotates, in the process, the nut 23 moves towards one side close to the single control switch 25 along the transmission shaft 20, after the grinding is performed for a period of time, the pressing block 231 on the nut 23 contacts with the single control switch 25 and applies pressure to the single control switch 25, the single control switch 25 controls the electromagnet 55 to be powered off, the electromagnet 55 loses magnetism and is no longer attracted to the magnet 66, at the moment, under the action of the first tension spring 64 and the second tension spring 53, the first push rod 62 and the second push rod 52 drive the grinding wheel 65 to move towards one side far away from the circular blade 40, the grinding wheel 65 does not grind the cutting edge of the circular blade 40 any more, at the moment, the grinding is completed, and the motor 30 is turned off.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. Knife sharpener, its characterized in that: the circular blade grinding machine comprises a rack, a grinding unit, a transmission unit, a control unit and a clamping unit for fixing a circular blade, wherein the clamping unit comprises a mounting seat, a rotating shaft fixedly connected with the mounting seat and a motor for driving the rotating shaft to rotate; the polishing unit comprises a communication column and an adjusting mechanism, wherein a transmission medium is filled in the communication column, the adjusting mechanism is used for adjusting the pressure in the communication column, a first piston is connected to one side of the communication column in a sliding manner, a first plunger is connected to the first piston in a rotating manner, a second piston is connected to the other side of the communication column in a sliding manner, a second plunger opposite to the first plunger is connected to the second piston in a rotating manner, and grinding wheels used for polishing the cutting edge of the circular blade are arranged on the first plunger and the second plunger; a first gear barrel is fixed on the first plunger, and a first gear is fixed on the second plunger; the transmission unit comprises a transmission shaft which is rotationally connected to the rack, and an output gear meshed with the first gear cylinder and a second gear cylinder meshed with the first gear cylinder are fixed on the transmission shaft; a third gear barrel meshed with the first gear is fixed on the rotating shaft; cavities are formed in the first plunger and the second plunger, a first push rod is connected in the cavity of the first plunger in a sliding mode, a second push rod is connected in the cavity of the second plunger in a sliding mode, a first tension spring is connected between the first push rod and the first plunger, and a second tension spring is connected between the second push rod and the second plunger; the two grinding wheels are respectively fixed on the first push rod and the second push rod; a magnet is fixed in the grinding wheel of the first push rod, and an electromagnet is fixed in the grinding wheel of the second push rod; the control unit comprises a single control switch for controlling the power-off of the electromagnet, the transmission shaft is in threaded connection with a nut which can only move along the radial direction of the transmission shaft, and a pressing block which can apply pressure to the single control switch is fixed on the nut.

2. The knife sharpener of claim 1, wherein: a limiting rod with one side passing through the nut is fixed on the frame.

3. The tool sharpener of claim 1 or 2, wherein: the adjusting mechanism comprises a first annular cylinder and a second annular cylinder which are both communicated with the communicating column, and the area of the section of the first annular cylinder is 4-8 times that of the section of the second annular cylinder; the inner walls of the first annular cylinder and the second annular cylinder are provided with threads, a first pressing plate is connected with the first annular cylinder through threads, a second pressing plate is connected with the second annular cylinder through threads, a first handle is fixed on the first pressing plate, and a second handle is fixed on the second pressing plate.

4. The tool sharpener of claim 1 or 2, wherein: a positioning rod capable of penetrating through the through hole of the circular blade is fixed on the mounting seat, and a positioning block is connected to the positioning rod through threads.