CN111546177A - Chalk end grinding device - Google Patents
Chalk end grinding device Download PDFInfo
- Publication number
- CN111546177A CN111546177A CN202010540282.XA CN202010540282A CN111546177A CN 111546177 A CN111546177 A CN 111546177A CN 202010540282 A CN202010540282 A CN 202010540282A CN 111546177 A CN111546177 A CN 111546177A
- Authority
- CN
- China
- Prior art keywords
- chalk
- rotor
- mandrel
- arc
- funnel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor
- B24B11/02—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/02—Frames; Beds; Carriages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/12—Devices for exhausting mist of oil or coolant; Devices for collecting or recovering materials resulting from grinding or polishing, e.g. of precious metals, precious stones, diamonds or the like
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention relates to a chalk end grinding device, which effectively solves the problems that a new chalk is inconvenient to use and a chalk end is broken off, so that great waste is caused; the technical scheme includes that the chalk dust collector comprises a mandrel, a conical rotor with a large upper part and a small lower part is mounted on the mandrel, the rotor can rotate relative to the mandrel, a disc is fixed at the lower end of the mandrel, an annular groove is formed in the upper surface of the disc, a grinding sheet is attached to the surface of the annular groove, a plurality of arc-shaped frames with the circumferences uniformly distributed on the outer sides of the arc-shaped frames and the openings facing the rotor are arranged at the upper end of the rotor, chalk can penetrate into the arc-shaped frames downwards at the small ends and extend into the annular groove after penetrating into the arc-shaped frames, the outer walls of the rotor are tightly attached under the limiting action of the arc-shaped frames, the chalk dust collector also comprises a funnel, the rotor and the disc are located at the axis of the funnel, and the chalk falls; the invention effectively reduces the folding length of the chalk and improves the utilization rate of the chalk.
Description
Technical Field
The invention relates to the field of teaching tools, in particular to a chalk end grinding device.
Background
The chalk is a necessary writing tool in classroom teaching, and even at present when multimedia equipment is popularized, the chalk blackboard writing still plays an indispensable role in classroom teaching; when a teacher uses a new chalk for writing, the written marks are fine and unclear due to the hard edges and the hard skin of the end part of the chalk, and the written marks can also emit harsh sound when the teacher writes on a blackboard, so that the teacher can break and discard the small end of the chalk by hand before writing with the new chalk, and then writes, so that the chalk is not convenient to use, more importantly, when the chalk end is broken, the broken head is shorter and harder, therefore, the broken head of the chalk at least has the length of a nail at each time, occupies about one fifth of the total length of the chalk, extends to the length of one third of the chalk without attention, and great waste is caused.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the chalk end grinding device, which effectively solves the problems that a new chalk is inconvenient to use and a chalk head is broken off, so that great waste is caused.
The technical scheme includes that the chalk end grinding device comprises a vertical rotatable mandrel, the mandrel is connected with a driving motor, a conical rotor with a large upper end and a small lower end is mounted on the mandrel and can rotate relative to the mandrel, a reversing mechanism is mounted on the mandrel and enables the rotor and the mandrel to rotate in opposite directions, a horizontal disc is fixed at the lower end of the mandrel, an annular groove is formed in the upper surface of the disc, the section of the annular groove is semicircular, a grinding sheet is attached to the surface of the annular groove, a plurality of arc-shaped frames with the circumferences uniformly distributed on the outer side and the openings facing the rotor are arranged at the upper end of the rotor, the arc-shaped frames are fixed, small ends of chalks can penetrate into the arc-shaped frames downwards, after the small ends of the chalks penetrate into the arc-shaped frames, the lower ends of the chalks extend into the annular groove, and the outer wall; the chalk dropping device also comprises a hopper, wherein the rotor and the disc are positioned at the axis of the hopper, and chalk falls into the hopper after falling off from the annular frame and then vertically slides out from the lower end of the hopper.
According to the invention, the small end of the chalk is ground through the matching of the annular groove and the rotor, the hard edge and hard skin at the lower end of the chalk are ground off and are ground into a hemisphere shape suitable for writing, a teacher can directly write by picking up the chalk without carrying out end treatment, the use is convenient, the length of broken chalk is effectively reduced, and the utilization rate of the chalk is improved; in addition, the supporting plate is always kept with the chalk for taking, so that the chalk can be taken at any time, and the chalk holder is convenient and quick.
The invention obtains the chalk suitable for writing with the minimum loss, effectively reduces the folding length of the chalk, improves the utilization rate of the chalk, and is convenient and quick to use.
Drawings
Fig. 1 is a front sectional view of the present invention.
FIG. 2 is a front sectional view of the chalk of the present invention sliding off the holder.
Fig. 3 is a top view of the rotor position.
Fig. 4 is a front view of the rotor.
Fig. 5 is a top view of the disk.
Fig. 6 is an enlarged view of the position a in fig. 1.
Fig. 7 is an enlarged view of the position B in fig. 1.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
As shown in figures 1 to 7, the chalk dust collector comprises a vertical rotatable mandrel 1, the mandrel 1 is connected with a driving motor 2, a conical rotor 3 with a large upper end and a small lower end is arranged on the mandrel 1, the rotor 3 can rotate relative to the mandrel 1, a reversing mechanism is arranged on the mandrel 1, the reversing mechanism enables the rotor 3 to rotate oppositely to the mandrel 1, a horizontal disc 4 is fixed at the lower end of the mandrel 1, an annular groove 5 is formed in the upper surface of the disc 4, the section of the annular groove 5 is semicircular, a grinding sheet 6 is attached to the surface of the annular groove 5, a plurality of arc-shaped frames 7 with the circumference uniformly distributed at the outer side and the opening facing the rotor 3 are arranged at the upper end of the rotor 3, the arc-shaped frames 7 are fixed, chalk can penetrate into the arc-shaped frames 7 with the small end, after the chalk penetrates into the arc-shaped frame 7, the lower end of the chalk extends into the annular groove 5, and the chalk is tightly attached to the outer wall of the rotor 3 under the limiting action of the arc-shaped frame 7; the chalk feeder also comprises a hopper 8, wherein the rotor 3 and the disc 4 are positioned at the axis of the hopper 8, chalk falls into the hopper 8 after falling off from the annular frame, and then vertically slides out from the lower end of the hopper 8.
The outer wall of the rotor 3 is provided with spiral grains 9, and the spiral grains 9 can increase friction between the rotor 3 and the chalk, so that the rotor 3 drives the chalk to rotate, and downward pressing force is applied to the chalk.
The lower end of the disc 4 is rotatably provided with a dust collecting box 10, the dust collecting box 10 is connected with an air pump 11 capable of pumping negative pressure, the circumference of the bottom of the annular groove 5 is uniformly provided with a plurality of dust collecting ports 12, and the plurality of dust collecting ports 12 are communicated with the dust collecting box 10 through dust collecting channels 13; the air pump 11 is actuated to draw chalk powder in the annular groove 5 into the dust box 10 through the dust collection port 12 and the dust collection passage 13.
A filter screen 14 is arranged between the dust collecting box 10 and the air pump 11, so that chalk powder can be prevented from entering the air pump 11.
The reversing device comprises a first bevel gear 15 fixed on the mandrel 1 and a second bevel gear 16 fixed above the rotor 3, the small ends of the first bevel gear 15 and the second bevel gear 16 are opposite, a third bevel gear 17 is meshed between the first bevel gear 15 and the second bevel gear 16, and the third bevel gear 17 is rotatably arranged on the funnel 8.
The arc-shaped frames 7 and the dust collecting box 10 are fixed on the funnel 8.
The chalk box is characterized in that a horizontal supporting plate 18 is arranged under the lower end opening of the funnel 8, a supporting pressure spring 19 is installed below the supporting plate 18, chalk falls on the supporting plate 18 after sliding out of the lower end opening of the funnel 8, the upper end of the chalk is located in the lower end opening of the funnel 8, and when the chalk is taken, the chalk is held down and pressed down, so that the upper end of the chalk is moved out of the lower end opening of the funnel 8, and the chalk can be taken away.
8 lower port department install a distance sensor 20, distance sensor 20 steerable driving motor 2 and the start-stop of air pump 11, when distance sensor 20 detects that 8 lower port departments of funnel do not have the chalk, distance sensor 20 sends signal start driving motor 2 and air pump 11.
When the device is used, the device is placed on a platform, chalks are inserted into the arc-shaped frames 7, the lower ends of the chalks are inserted into the annular groove 5 downwards, the large ends of the chalks are positioned in the arc-shaped frames 7 upwards, the device is powered on, the distance sensor 20 detects that no chalks exist at the lower port of the funnel 8, a control signal is sent to start the driving motor 2 and the air pump 11, the driving motor 2 drives the disc 4 to rotate through the mandrel 1, and meanwhile, the mandrel 1 drives the rotor 3 to reversely rotate relative to the mandrel 1 and the disc 4 through the reversing action of the first bevel gear 15, the second bevel gear 16 and the third bevel gear 17; when the rotor 3 rotates, the spiral grains 9 apply a downward component force to the chalk, the lower end of the chalk is tightly pressed on the grinding sheet 6 in the annular groove 5, the annular groove 5 rotates to grind the chalk, meanwhile, the rotor 3 drives the chalk to rotate through friction force, the lower end of the chalk is ground by 360 degrees, so that the hard edge of the lower end of the chalk is ground, the small end of the chalk can be finally ground into a semi-sphere shape and can be directly used for writing, and the ground chalk powder is collected into the dust collection box 10 through the dust collection port 12 and the dust collection channel 13 by the air pump 11.
As the lower end of the chalk is gradually abraded, the chalk gradually moves downwards under the action of the downward component force exerted by the rotor 3, because the upper end of the rotor 3 is larger and the lower end is smaller, the upper end of the chalk inclines outwards, when the chalk moves downwards to the upper end and is lower than the arc-shaped frame 7, the upper end of the chalk is toppled outwards and is put on the inner wall of the funnel 8, at the moment, the limiting function of the arc-shaped frame 7 is lost, the lower end of the chalk revolves along with the disc 4, finally, the lower end of the chalk slides off the disc 4, the chalk falls into the funnel 8 and slides off from the lower port of the funnel 8, the lower end of the chalk falls on the supporting plate 18, the upper end of the chalk is positioned in the lower port of the funnel 8, the distance sensor 20 detects the chalk at the lower port of the funnel 8, a control signal is sent out to enable the, when the chalk needs to be taken, the chalk on the supporting plate 18 is pinched and pressed downwards, so that the upper end of the chalk is exposed out of the lower port of the funnel 8, and the chalk can be taken away; after taking away the chalk, the supporting plate 18 returns to the original position under the action of the supporting compression spring 19, the distance sensor 20 detects that no chalk exists at the lower port of the funnel 8, a control signal is sent to start the driving motor 2 and the air pump 11, the chalk in the annular groove 5 is continuously ground until the chalk is ground and falls on the supporting plate 18 for taking.
According to the invention, the small end of the chalk is ground through the matching of the annular groove 5 and the rotor 3, the hard edge and hard skin at the lower end of the chalk are ground off and are ground into a hemisphere shape suitable for writing, a teacher can directly write by picking up the chalk without carrying out end treatment, the use is convenient, the chalk suitable for writing is obtained with the minimum loss amount, the breaking length of the chalk is effectively reduced, and the utilization rate of the chalk is improved; in addition, the supporting plate 18 is always kept with chalk for taking, so that the chalk can be taken at any time, and the chalk holder is convenient and quick.
Claims (8)
1. A chalk end grinding device is characterized by comprising a vertical rotatable mandrel (1), the mandrel (1) is connected with a driving motor (2), a conical rotor (3) with a large upper end and a small lower end is installed on the mandrel (1), the rotor (3) can rotate relative to the mandrel (1), a reversing mechanism is installed on the mandrel (1), the reversing mechanism enables the rotor (3) to rotate oppositely to the mandrel (1), a horizontal disc (4) is fixed at the lower end of the mandrel (1), an annular groove (5) is formed in the upper surface of the disc (4), the section of the annular groove (5) is semicircular, grinding pieces (6) are attached to the surface of the annular groove (5), a plurality of arc-shaped frames (7) with the circumferences uniformly distributed at the outer side of the upper end of the rotor (3) and the openings facing the rotor (3) are arranged at the outer side of the upper end of the rotor (3), the plurality of the arc-shaped frames (7) are all fixed, and the small, after penetrating into the arc-shaped frame (7), the lower end of the chalk extends into the annular groove (5), and the chalk is tightly attached to the outer wall of the rotor (3) under the limiting action of the arc-shaped frame (7); the chalk feeder also comprises a hopper (8), wherein the rotor (3) and the disc (4) are positioned at the axis of the hopper (8), chalk falls into the hopper (8) after falling off from the annular frame, and then vertically slides out from the lower end of the hopper (8).
2. The chalk end grinding device according to claim 1, characterized in that the rotor (3) is provided with a spiral line (9) on the outer wall, and the spiral line (9) applies a downward pressing force to the chalk when the rotor (3) rotates.
3. The chalk end grinding device according to claim 1, characterized in that a dust collecting box (10) is rotatably mounted at the lower end of the disc (4), an air pump (11) capable of pumping negative pressure is connected to the dust collecting box (10), a plurality of dust collecting ports (12) are uniformly distributed on the circumference of the bottom of the annular groove (5), and the dust collecting ports (12) are communicated with the dust collecting box (10) through dust collecting channels (13).
4. The chalk end grinding device according to claim 1, characterized in that a filter screen (14) is installed between the dust box (10) and the air pump (11).
5. The chalk end grinding device according to claim 1, characterized in that the reversing device comprises a first bevel gear (15) fixed on the spindle (1) and a second bevel gear (16) fixed above the rotor (3), the small ends of the first bevel gear (15) and the second bevel gear (16) are opposite, a third bevel gear (17) is meshed between the first bevel gear (15) and the second bevel gear (16), and the third bevel gear (17) is rotatably arranged on the funnel (8).
6. The chalk end grinding device according to claim 1, characterized in that the plurality of arc-shaped brackets (7) and the dust box (10) are fixed on the hopper (8).
7. The chalk end grinding device according to claim 1, characterized in that a horizontal supporting plate (18) is arranged right below the lower port of the funnel (8), a supporting pressure spring (19) is arranged below the supporting plate (18), after the chalk slides out of the lower port of the funnel (8), the lower end of the chalk falls on the supporting plate (18), and the upper end of the chalk is positioned in the lower port of the funnel (8).
8. The chalk end grinding device according to claim 1, characterized in that a distance sensor (20) is installed at the lower port of the funnel (8), the distance sensor (20) can control the start and stop of the driving motor (2) and the air pump (11), and when the distance sensor (20) detects that no chalk is at the lower port of the funnel (8), the distance sensor (20) sends a signal to start the driving motor (2) and the air pump (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010540282.XA CN111546177B (en) | 2020-06-15 | 2020-06-15 | Chalk end grinding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010540282.XA CN111546177B (en) | 2020-06-15 | 2020-06-15 | Chalk end grinding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111546177A true CN111546177A (en) | 2020-08-18 |
| CN111546177B CN111546177B (en) | 2021-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010540282.XA Active CN111546177B (en) | 2020-06-15 | 2020-06-15 | Chalk end grinding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111546177B (en) |
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| EP1424214A1 (en) * | 2002-11-29 | 2004-06-02 | IHD Institut für Holztechnologie Dresden gGmbH | Process and device for smoothing and compressing of the surface of pencils or the like |
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| CN210678283U (en) * | 2019-09-26 | 2020-06-05 | 荆州市远航刀具有限公司 | Cutter piece bi-polar face grinder |
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| CN111546177B (en) | 2021-07-06 |
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