CN110774135A

CN110774135A - Lithium electricity angle mill

Info

Publication number: CN110774135A
Application number: CN201911094554.1A
Authority: CN
Inventors: 沈犇; 段贤文; 方新权; 欧阳楚南
Original assignee: Zhejiang Guanxin Science And Technology Co Ltd
Current assignee: Zhejiang Guanxin Science And Technology Co Ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-02-11
Anticipated expiration: 2039-11-11
Also published as: CN110774135B

Abstract

The invention discloses a lithium battery angle grinder which comprises a handle and a grinding wheel, wherein a motor is arranged in the handle, the motor drives an output shaft to rotate through a transmission mechanism, one end of the output shaft extends out of the handle, the grinding wheel is fixed at the end, extending out of the handle, of the output shaft, the lithium battery angle grinder also comprises a rear check ring and a front check ring, the top of the rear check ring is fixed on the handle, the bottom of the rear check ring covers the outer ring of one side, facing an operator, of the grinding wheel, the front check ring is made of an iron material, the top of the front check ring is connected to the output shaft in a sliding mode, the bottom of the front check ring covers the outer ring of one side, facing away from the operator.

Description

Lithium electricity angle mill

Technical Field

The invention relates to an angle grinder, in particular to an angle grinder for a lithium battery.

Background

An angle grinder is a device for grinding the surface of a part, and when the angle grinder grinds a product, a lot of powder is generated, and the powder has some harm to human bodies. In particular, the angle grinder produces iron dust powder at high temperature when processing iron products, and sparks are generated, and have certain dangerousness and can cause fire if being stained with inflammable materials.

For solving the problem of dust generated during the operation of the angle grinder, CN206869619U discloses an angle grinder, which comprises an angle grinder body, an isolation cover and a dust collector, wherein the front end of the angle grinder body is provided with a grinding wheel; the isolation cover is transparent and hemispherical and covers the grinding wheel, and the front side wall and the rear side wall of the isolation cover are vertically provided with slotted holes; the dust collector comprises a dust collecting chamber, an air suction pipe, a magnetic net and an exhaust fan, wherein the dust collecting chamber is communicated with the isolation cover through the air suction pipe, the magnetic net is arranged in the dust collecting chamber, and the exhaust fan is arranged below the magnetic net. It not only avoids metal dust to splash, the polluted environment through keeping apart the grinding region to can weaken noise pollution.

The angle grinder utilizes the isolation cover to block dust, and the dust can be effectively prevented from leaking. However, this structure has a great problem that the cover interferes with the machining of the grinding wheel, so that the grinding wheel cannot contact with the machined part. Such a product cannot be manufactured in practice.

Meanwhile, the grinding wheel on the angle grinder is brittle and is easy to break after being impacted, and the original exposed grinding wheel is easy to damage.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the lithium electric angle grinder which can effectively prevent sparks generated in processing from leaking and can effectively protect a grinding wheel.

The technical scheme adopted by the invention for solving the technical problems is as follows: a lithium electric angle grinder comprises a handle and a grinding wheel, wherein a motor is arranged in the handle, the motor drives an output shaft to rotate through a transmission mechanism, one end of the output shaft extends out of the handle, the grinding wheel is fixed at one end of the output shaft extending out of the handle, a battery pack is arranged at the bottom of the handle, the lithium electric angle grinder also comprises a rear check ring and a front check ring, the top of the rear check ring is fixed on the handle, the bottom of the rear check ring covers the outer ring of one side of the grinding wheel facing an operator, the front check ring is made of iron materials, the top of the front check ring is connected onto the output shaft in a sliding mode, the bottom of the front check ring covers the outer ring of one side of the grinding wheel facing away from the operator, an electromagnet is further arranged on the output shaft, the battery pack is connected with the electromagnet through an inverter, the electromagnet is electrified to attract the front check ring, so that one side of the grinding wheel, which is back to an operator, is exposed out of the front check ring. The angle grinder with the structure has the advantages that when the angle grinder is not used at ordinary times, the grinding wheel is protected between the front retainer ring and the rear retainer ring, the grinding wheel is prevented from being collided and damaged, when the angle grinder works, the front retainer ring of the grinding wheel is attracted by the electromagnet and then rises, the grinding wheel machining part (namely, the side back to an operator) leaks outside, the angle grinder can be machined like a common angle grinder at this time, and meanwhile, the front retainer ring is also magnetic after being attracted by the electromagnet, so that sparks generated when the grinding wheel is used for machining steel can be adsorbed on the front retainer ring, and the sparks are prevented from being sputtered. Because the electromagnet needs to generate magnetism only by changing current, an inverter is connected to the current output by the battery pack, so that the electromagnet can generate a magnetic field.

In the above technical scheme, preferably, the rear retainer ring and the output shaft are made of iron material, the magnetism generated by the electromagnet is transmitted to the rear retainer ring by the output shaft, and the rear retainer ring can also be magnetized to adsorb dust.

In the above technical scheme, preferably, the transmission mechanism includes a speed reducer, the motor drives the transmission shaft to rotate after passing through the speed reducer, and the transmission shaft is matched with the output shaft through a bevel gear.

In the above technical solution, preferably, the inverter includes a commutator, a first copper ring, and a second copper ring that are disposed on the transmission shaft, two copper sheets are disposed on a side wall of the commutator, the two copper sheets are respectively in contact with the first copper ring and the second copper ring, the inverter further includes two first brushes that are in contact with the commutator, a second brush that is in contact with the first copper ring, and a third brush that is in contact with the second copper ring, the two first brushes are respectively electrically connected with a positive electrode and a negative electrode of the battery pack, and the second brush and the third brush are respectively in contact with two ends of a coil of the electromagnet. The direct current that the lithium electricity package transmitted under the rotation of transmission shaft, can be constantly change the electric polarity on the copper sheet, so also constantly changing the electric polarity of first copper ring and second copper ring, let the both ends of electro-magnet produce the alternating current, thereby let the electro-magnet produce the magnetic field. The inverter with the structure makes full use of the existing structure, greatly reduces the cost, and greatly improves the efficiency compared with the traditional inverter in an electronic form.

In the above technical scheme, preferably, the transmission shaft is provided with a centrifugal fan, and the handle is provided with an air suction opening on one end surface facing the grinding wheel. The centrifugal fan generates negative pressure to absorb dust generated by the angle grinder into the handle, and the dust is absorbed on the rear retaining ring in the inward absorption process.

In the above technical solution, preferably, two end faces of the front retainer ring and the rear retainer ring are attached to each other.

In the above technical solution, preferably, the front retainer includes a cover body and a sleeve, the sleeve is slidably connected to the output shaft, and the cover body and the sleeve are fixed together.

In the above technical solution, preferably, a spring is disposed on the output shaft, and the spring is located between the sleeve and the handle. The spring ensures that the front retainer ring is always kept on the grinding wheel to protect the grinding wheel when the front retainer ring is in a normal state.

In the above technical scheme, preferably, a groove is formed in the handle at the extending position of the output shaft, and the spring penetrates into the groove.

The invention has the beneficial effects that: when the grinding wheel is in work, the electromagnet is electrified to attract the front check ring, so that one side of the grinding wheel, which is back to an operator, is exposed out of the front check ring. The angle grinder with the structure has the advantages that when the angle grinder is not used at ordinary times, the grinding wheel is protected between the front retainer ring and the rear retainer ring, the grinding wheel is prevented from being collided and damaged, when the angle grinder works, the front retainer ring of the grinding wheel is attracted by the electromagnet and then rises, the grinding wheel machining part (namely, the side back to an operator) leaks outside, the angle grinder can be machined like a common angle grinder at this time, and meanwhile, the front retainer ring is also magnetic after being attracted by the electromagnet, so that sparks generated when the grinding wheel machines steel can be adsorbed on the front retainer ring, and the spark sputtering is avoided. The adsorbed dust can automatically fall off from the front baffle ring after the equipment is powered off, so that the dust is convenient to clean.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a front view of the present invention.

Fig. 3 is a side view (in partial cross-section) of the present invention.

FIG. 4 is a schematic view of the present invention with the front ring raised.

Fig. 5 is a partially enlarged view of a portion a of fig. 4.

Fig. 6 is a schematic diagram of a commutator.

Fig. 7 is a partially enlarged schematic view of fig. 4 at B. .

Detailed Description

The invention is described in further detail below with reference to the following figures and detailed description:

the technical scheme adopted by the invention for solving the technical problems is as follows:

as shown in fig. 1 to 6, the lithium electric angle grinder comprises a handle 1 and a grinding wheel 2, wherein a motor 3 is arranged in the handle 1, and the motor 3 drives an output shaft 4 to rotate through a transmission mechanism. The bottom of the handle 1 is provided with a battery pack 8. In this embodiment, the transmission mechanism includes a speed reducer 31, the motor 3 drives a transmission shaft 32 to rotate through the speed reducer 31, and the transmission shaft 32 is matched with the output shaft 4 through a bevel gear. The output shaft 4 is made of ferrous materials.

One end of the output shaft 4 extends out of the handle 1, the grinding wheel 2 is fixed at one end of the output shaft 4 extending out of the handle 1, the grinding wheel further comprises a rear retaining ring 51 and a front retaining ring 52, and both the front retaining ring 51 and the rear retaining ring 52 are made of iron materials.

The top of the rear retainer ring 51 is fixed on the handle 1, and the bottom of the rear retainer ring 51 covers the outer ring of one side of the grinding wheel 2 facing to an operator.

The front retainer ring 52 includes a cover 521 and a sleeve 522, the sleeve 522 is slidably connected to the output shaft 4, and the cover 521 and the sleeve 522 are fixed together. The bottom of the front check ring 52 covers the outer ring of one side, back to the operator, of the grinding wheel 2, the electromagnet 6 is further arranged on the output shaft 4, the battery pack 8 is connected with the electromagnet 6 through an inverter 9, under a normal state, the electromagnet is not powered on, when the electric grinding wheel works, the electromagnet is powered on to attract the front check ring, one side, back to the operator, of the grinding wheel is exposed out of the front check ring, the front check ring is magnetized, meanwhile, magnetism generated by the electromagnet is transmitted to the back check ring through the output shaft, and the back check ring can also be magnetized to adsorb dust.

Referring to fig. 5 and 6, the inverter 9 includes a commutator 91, a first copper ring 92, a second copper ring 93, two

copper sheets

911 and 912 are disposed on a side wall of the commutator 91, the two

copper sheets

911 and 912 are respectively in contact with the first copper ring 92 and the second copper ring 93, two

first brushes

913 and 914 are in contact with the commutator, and a second brush 921 and a third brush 931 are in contact with the first copper ring 92 and the second copper ring 93, the two first brushes are respectively electrically connected to a positive electrode and a negative electrode of the battery pack, and the second brush and the third brush are respectively in contact with both ends of a coil of the electromagnet. The direct current that the lithium electricity package transmitted under the rotation of transmission shaft, can be constantly change the electric polarity on the copper sheet, so also constantly changing the electric polarity of first copper ring and second copper ring, let the both ends of electro-magnet produce the alternating current, thereby let the electro-magnet produce the magnetic field. The inverter with the structure makes full use of the existing structure, greatly reduces the cost, and greatly improves the efficiency compared with the traditional inverter in an electronic form.

A spring 7 is arranged on the output shaft 4, and the spring 7 is positioned between the sleeve 522 and the handle 1. The spring 7 ensures that the front retainer ring 52 always keeps the grinding wheel 2 in a blocking state when the front retainer ring 52 is in a normal state, so that the grinding wheel is protected. A groove 11 is formed in the extending position of the output shaft 4 on the handle 1, and the spring 7 penetrates into the groove 11.

The transmission shaft 32 is provided with a centrifugal fan 33, and an air suction opening 12 is formed in one end face, facing the grinding wheel, of the handle 1. The centrifugal fan generates negative pressure to absorb dust generated by the angle grinder into the handle, and the dust is absorbed on the rear retaining ring in the inward absorption process.

The angle grinder with the structure has the advantages that when the angle grinder is not used at ordinary times, the grinding wheel is protected between the front retainer ring and the rear retainer ring, the grinding wheel is prevented from being collided and damaged, when the angle grinder works, the front retainer ring of the grinding wheel is attracted by the electromagnet and then rises, the grinding wheel machining part (namely, the side back to an operator) leaks outside, the angle grinder can be machined like a common angle grinder at this time, and meanwhile, the front retainer ring is also magnetic after being attracted by the electromagnet, so that sparks generated when the grinding wheel machines steel can be adsorbed on the front retainer ring, and the spark sputtering is avoided.

Claims

1. The utility model provides a lithium electricity angle mill, includes handle and emery wheel, be provided with the motor in the handle, the motor passes through drive mechanism drive output shaft and rotates, output shaft one end is stretched out the handle, the emery wheel is fixed the output shaft stretches out the one end of handle, the bottom of handle is provided with battery package, its characterized in that: still include a back retaining ring and a preceding retaining ring, back retaining ring top is fixed on the handle, back retaining ring bottom cover is in the emery wheel towards one side outer lane of operating personnel, preceding retaining ring is made by the iron material, top sliding connection be in on the output shaft, the bottom cover of preceding retaining ring is in one side outer lane of emery wheel operating personnel dorsad, still be provided with an electro-magnet on the output shaft, the battery package links to each other with the electro-magnet behind an dc-to-ac converter, under the normal condition, the electro-magnet is not electrified, and during operation, the electro-magnet is electrified, attracts preceding retaining ring makes one side of emery wheel operating personnel dorsad expose preceding retaining ring.

2. A lithium electric angle grinder as defined in claim 1, wherein: the rear check ring and the output shaft are made of iron materials, and magnetism generated by the electromagnet is transmitted to the rear check ring through the output shaft.

3. A lithium electric angle grinder as defined in claim 1, wherein: the transmission mechanism comprises a speed reducer, the motor drives a transmission shaft to rotate after passing through the speed reducer, and the transmission shaft is matched with the output shaft through a bevel gear.

4. A lithium electric angle grinder as defined in claim 3, wherein: the inverter comprises a commutator, a first copper ring and a second copper ring which are arranged on a transmission shaft, wherein two copper sheets are arranged on the side wall of the commutator, the two copper sheets are respectively contacted with the first copper ring and the second copper ring, the inverter also comprises two first electric brushes which are contacted with the commutator, a second electric brush which is contacted with the first copper ring and a third electric brush which is contacted with the second copper ring, the two first electric brushes are respectively electrically connected with the positive electrode and the negative electrode of the battery pack, and the second electric brush and the third electric brush are respectively contacted with the two ends of a coil of the electromagnet.

5. A lithium electric angle grinder as defined in claim 3, wherein: the transmission shaft is provided with a centrifugal fan, and an air suction opening is formed in one end face, facing the grinding wheel, of the handle.

6. A lithium electric angle grinder as defined in claim 1, wherein: the two end faces of the front retainer ring and the rear retainer ring are mutually attached.

7. A lithium electric angle grinder as defined in claim 1, wherein: the front retainer ring comprises a cover body and a sleeve, the sleeve is connected to the output shaft in a sliding mode, and the cover body and the sleeve are fixed together.

8. A lithium electric angle grinder as defined in claim 7, characterized in that: the output shaft is provided with a spring, and the spring is positioned between the sleeve and the handle.

9. A lithium electric angle grinder as defined in claim 8, wherein: a groove is formed in the extending position of the output shaft on the handle, and the spring penetrates into the groove.