CN110626550B - Automatic chalk device and using method thereof - Google Patents

Abstract

The invention discloses an automatic chalk device and a using method thereof, belonging to the field of teaching tools, wherein the automatic chalk device comprises a chalk storage box and a chalk sleeve matched with the chalk storage box, the chalk storage box comprises a storage part for storing chalk and an elastic telescopic discharging part for outputting the chalk, the elastic telescopic discharging part is arranged on one side of a discharging port of the storage part and communicated with the inside of the storage part, the elastic telescopic discharging part comprises at least one spring actuating mechanism, and when the chalk sleeve pushes and presses the spring actuating mechanism along the axial direction of the chalk, the spring actuating mechanism moves from a blocking position for the chalk to a non-blocking position, so that the chalk is clamped into a chalk clamping cavity in the chalk sleeve. The automatic chalk device disclosed by the invention can automatically fill the chalk stored in the chalk storage box into the chalk sleeve without manual insertion, and is more convenient, more sanitary and healthier.

Description

Automatic chalk device and using method thereof

Technical Field

The invention relates to the field of teaching aids, in particular to an automatic chalk device and a using method thereof.

Background

The chalk is a tool widely used in daily life, is generally used for writing on a blackboard and is a necessity of teachers in the teaching field. The chalk is a white precipitate of calcium sulfate, which is not easily decomposed and has larger particles than dust. The main components of the chalk used in China are calcium carbonate (limestone) and calcium sulfate (gypsum), or a small amount of calcium oxide.

The teacher usually directly takes the chalk to write by hand, makes the finger be infected with the cuttings of chalk easily, and has added chemical pigment in the chalk of different colours, all is a big hidden danger to personal hygiene and skin health, and holds between the fingers the position of chalk and can be colored by the chalk, leads to teacher's hand to be stained, needs to spend a large amount of water and time and washs. Meanwhile, the chalk is brittle and easy to break, and the broken chalk and the shorter chalk after being worn are not convenient to use.

Therefore, people design a chalk sleeve, and insert the chalk into the chalk sleeve, and hold the chalk sleeve by hand to write, so that the problems are solved. However, the existing chalk sleeve still needs to be manually taken out of the chalk box, and then the chalk is filled into the chalk sleeve, so that the chalk sleeve still can be in more contact with the chalk, the chalk sleeve cannot be in contact with the chalk to the greatest extent, and when the chalk is filled, due to the design of the existing chalk sleeve, a clamping cavity is narrow, the manual filling is time-consuming and labor-consuming, and the chalk sleeve is inconvenient to fill.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to solve the technical problem of providing an automatic chalk device and a using method thereof, and the chalk device can automatically fill the chalk stored in the chalk storage box into the chalk sleeve through the matching arrangement of the chalk storage box and the chalk sleeve without manual insertion, and is more convenient, more sanitary and healthier.

The technical scheme adopted by the invention is as follows:

the invention provides an automatic chalk device which comprises a chalk storage box and a chalk sleeve matched with the chalk storage box, wherein the chalk storage box comprises a storage part for storing chalk and an elastic telescopic discharging part for outputting the chalk, the elastic telescopic discharging part is arranged on one side of a discharging port of the storage part and communicated with the inside of the storage part, the elastic telescopic discharging part comprises at least one spring actuating mechanism, and when the chalk sleeve pushes and presses the spring actuating mechanism along the axial direction of the chalk, the spring actuating mechanism moves to a non-blocking position from a blocking position of the chalk, so that the chalk is clamped into a chalk clamping cavity in the chalk sleeve.

As a further development of the solution, the at least one spring-actuated mechanism comprises a linearly movable barrier and a spring member which urges the barrier into the blocking position.

As a further improvement of the solution, the spring-actuated mechanism is provided with at least two, a chalk temporary storage position is formed between at least two spring-actuated mechanisms, and the chalk temporary storage position is positioned below the discharge port of the storage part.

As a further improvement of the scheme, the storage part comprises a box body and a chalk storage cavity arranged in the box body, the discharge port is arranged at the bottom of the box body and communicated with the chalk storage cavity, the elastic telescopic discharge part also comprises a first sliding plate and a second sliding plate which are arranged at the bottom of the box body and positioned at one side of the discharge port, the first sliding plate is positioned between the discharge port and the second sliding plate, the blocking piece sequentially penetrates through the first sliding plate and the second sliding plate, so that the left half part of the blocking piece is positioned below the discharge port, the right half part of the blocking piece is positioned between the first sliding plate and the second sliding plate, the spring part comprises a resisting block fixedly arranged on the blocking piece and a compression spring sleeved on the blocking piece, and the resisting block and the compression spring are both positioned between the first sliding plate and the second sliding plate, the abutting block is positioned between the first sliding plate and the compression spring.

As a further improvement of the present scheme, the chalk sleeve includes an outer sleeve body and a clamping mechanism movably disposed inside the outer sleeve body for clamping the chalk, a position avoiding groove is disposed on a side wall of the outer sleeve body, and when the chalk sleeve pushes and presses the spring actuating mechanism along the axial direction of the chalk, the position avoiding groove can enable the outer sleeve body to avoid contacting with the chalk above the chalk in the chalk temporary storage position.

As a further improvement of the scheme, the clamping mechanism comprises a retracting support bottom block, at least two clamping plates and a retracting support rod, wherein the retracting support bottom block is arranged inside the outer sleeve body, the retracting support bottom block is arranged below the clamping plates, the retracting support bottom block and each clamping plate are hinged to each other, the retracting support rod is arranged between the at least two clamping plates, a chalk clamping cavity is formed between the at least two clamping plates, a retracting support space is formed between the outer walls of the at least two clamping plates and the inner wall of the outer sleeve body, a clamping convex part is arranged on the outer wall of the top of each clamping plate, and when the retracting support bottom block is pushed, the clamping convex parts of the at least two clamping plates all stretch out of the outer sleeve body.

As a further improvement of the scheme, the clamping mechanism further comprises a pushing member connected with the support-retracting bottom block, a pushing sliding groove is formed in the side wall of the lower portion of the outer sleeve, and the pushing member is in sliding fit with the pushing sliding groove.

As a further improvement of the present scheme, the clamping mechanism further includes a connecting rod disposed at the bottom end of the retracting and supporting bottom block, and a limit cap disposed at the bottom end of the connecting rod, the pushing member includes a pushing block, a pushing ring, and a pushing rod connected between the pushing block and the pushing ring, the pushing ring is sleeved on the connecting rod, the pushing rod is slidably connected with the pushing chute, the pushing block is located outside the outer sleeve, and an L-shaped locking slot communicated with the pushing chute is disposed on one side of the side wall of the outer sleeve located on the pushing chute.

As a further improvement of the scheme, the chalk sleeve further comprises a pushing piece used for pushing up the worn shortened chalk, the pushing piece comprises a pushing plate, a pushing block and a pushing rod connected between the pushing plate and the pushing block, the pushing plate is located inside the chalk clamping cavity, the pushing rod is in sliding fit with the avoiding groove, and the pushing block is located outside the outer sleeve body.

The using method of the automatic chalk device comprises the following steps:

s101: the pushing block of the chalk sleeve is turned to enable the pushing rod to be positioned in the pushing chute;

s102: pushing the pushing block forwards to enable the pushing belt to move the support-retracting bottom block to move upwards;

s103: the support retracting bottom block drives the clamping plates to move upwards through support retracting support rods, the clamping plates are unfolded, the outer walls of the clamping plates are abutted against the inner wall of the outer sleeve body, and clamping convex parts at the upper ends of the clamping plates extend out of the outer sleeve body;

s104: the position avoiding groove of the outer sleeve body faces upwards, the clamping plates are respectively aligned to the end parts of the blocking parts of the spring actuating mechanisms of the chalk storage box, the pushing block is pressed, the clamping plates push the blocking parts forwards, the springs are compressed, the blocking parts gradually move to the non-blocking position in the direction close to the first sliding plate, and chalks in the chalk temporary storage position are gradually clamped into the chalk clamping cavities between the clamping plates;

s105: pushing the pushing block backwards to enable the pushing belt to move the support retracting bottom block downwards;

s106: the support retracting bottom block drives the clamping plates to move downwards through the support retracting supporting rod, and the clamping convex parts of the clamping plates are tightly abutted to the inner wall of the outer sleeve body, so that the inner wall of each clamping plate clamps the chalk;

s107: gradually withdrawing the chalk sleeve backwards from the chalk temporary storage position, resetting each blocking piece to the blocking position under the elastic force action of the compression spring, and enabling the previous chalk in the chalk storage cavity to fall into the chalk temporary storage position;

s108: the pushing block is turned to enable the pushing rod to be clamped into the L-shaped locking clamping groove, and chalk filling is completed;

s109: after the chalk is gradually worn in the using process, the pushing block is turned to enable the pushing rod to be located in the pushing sliding groove; pushing the pushing block to prop open each clamping plate; pushing the pushing block to enable the pushing plate to push the chalk to move upwards so as to adjust the length of the chalk extending out of the outer sleeve body; and pushing down the pushing block to enable the clamping plates to clamp the chalk again, and clamping the pushing rod into the L-shaped locking clamping groove to finish the adjustment of the extending length of the worn chalk.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides an automatic chalk device, which is characterized in that a chalk storage box and a chalk sleeve matched with the chalk storage box are arranged, the chalk storage box comprises a storage part and an elastic telescopic discharging part, the storage part can store chalk, the elastic telescopic part with a spring actuating mechanism is used for blocking and outputting the chalk stored in the storage part in a valve type movable manner, the end part of a chalk blocking cavity of the chalk sleeve is aligned with the end part of the chalk on the spring actuating mechanism, the chalk sleeve pushes the spring actuating mechanism along the axial direction of the chalk, the spring actuating mechanism is gradually moved to a non-blocking position from a blocking position for the chalk, so the chalk is gradually blocked in the chalk blocking cavity in the chalk sleeve, the chalk sleeve is withdrawn backwards to complete chalk filling, and the spring actuating mechanism is returned to a blocking state to carry and block the next chalk along with the withdrawal of the chalk sleeve, is convenient for next filling. Therefore, the automatic chalk device provided by the invention can automatically fill the chalk in the chalk storage box into the chalk sleeve without manually taking the chalk out of the chalk storage box and then manually filling the chalk into the chalk sleeve, so that the contact between a human hand and the chalk is avoided to a greater extent, the whole filling process is only pushed forwards and returned backwards, the manual filling time is shortened, and the chalk is filled very quickly and conveniently.

Drawings

FIG. 1 is a schematic view of a robot chalk apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic front view of a chalk storage box provided in an embodiment of the invention;

FIG. 3 is a schematic diagram of a right side view of a chalk storage box provided in an embodiment of the invention;

FIG. 4 is a front view of a chalk cover according to an embodiment of the present invention;

FIG. 5 is a schematic top view of a chalk cover (with pusher shoe removed) provided in an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view taken along the line A-A of FIG. 5 (with the pusher member and pusher shoe removed) in accordance with an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a chalk sleeve (with the pusher member removed and the pusher member removed) when the clamping mechanism is spread apart as provided in an embodiment of the present invention;

FIG. 8 is a schematic view of the arrangement of the pusher member and connecting rod provided in accordance with the preferred embodiment of the present invention;

fig. 9 is a schematic structural view of a pusher shoe provided in an embodiment of the present invention.

In the figure:

1. a chalk storage box; 2. a chalk sleeve; 11. a storage section; 12. an elastic telescopic discharging part; 110. a discharge port; 120. a spring actuation mechanism; 3. chalk; 1201. a barrier; 1202. a spring member; 1200. a chalk temporary storage position; 111. a box body; 112. a chalk storage chamber; 121. a first support slide plate; 122. a second sliding plate; 12021. a resisting block; 12022. a compression spring; 21. an outer casing; 22. a clamping mechanism; 210. a position avoiding groove; 221. retracting the supporting bottom block; 222. a clamping plate; 223. retracting and supporting the supporting rod; 2220. clamping the convex part; 224. a pusher member; 211. pushing the chute; 225. a connecting rod; 226. a limiting cap; 2241. a pushing block; 2242. a push ring; 2243. a push rod; 212. an L-shaped locking slot; 23. a pushing element; 231. a pushing plate; 232. a pushing block; 233. a push rod; 227. compressing the spring.

Detailed Description

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

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 to 9, the present embodiment provides an automatic chalk device, which comprises a chalk storage box 1, a chalk sleeve 2 adapted to the chalk storage box 1, the chalk storage box 1 comprises a storage part 11 for storing chalk 3 and an elastic telescopic discharging part 12 for outputting the chalk 3, the elastic telescopic discharging part 12 is arranged at one side of a discharging port 110 of the storage part 11 and communicated with the inside of the storage part 11, the elastic telescopic discharging part 12 comprises at least one spring actuating mechanism 120, the spring actuating mechanism 120 moves from a blocking position to a non-blocking position for the chalk 3 by aligning the chalk blocking cavity end of the chalk sleeve 2 with the chalk end of the chalk 3 on the spring actuating mechanism 120, when the chalk sleeve 2 pushes the spring actuating mechanism 120 along the axial direction of the chalk 3, so that the chalk 3 is blocked in the blocking cavity inside the chalk sleeve 2, the chalk sleeve 2 is withdrawn, and the chalk 3 is filled, the spring-actuated mechanism 120 returns to the blocking position again with the withdrawal of the chalk sleeve 2 to receive and block the next chalk, so as to facilitate the next filling. Therefore, the automatic chalk device provided by the embodiment can automatically fill the chalk in the chalk storage box 1 into the chalk sleeve 2 without manually taking out the chalk from the chalk storage box and then manually filling the chalk into the chalk sleeve, contact between hands and the chalk is avoided to a greater extent, the chalk sleeve is more sanitary and healthy, the whole filling process is only pushed forwards and pushed back to the back, the manual filling time is shortened, and the chalk is filled quickly and conveniently.

Specifically, the at least one spring-actuated mechanism 120 includes a linearly movable stopper 1201 and a spring member 1202 that urges the stopper 1201 to a blocking position, the stopper 1201 may be an elongated U-shaped strip, V-shaped strip, or the like, which forms a chalk temporary storage position with the discharge port 110 to facilitate temporary placement of the chalk to be filled, when the chalk holder 2 pushes the stopper 1201 in the axial direction of the chalk 3, the spring member 1202 is compressed, the stopper 1201 moves from the blocking position (below the discharge port 110) to a non-blocking position (on the side of the discharge port 110) with respect to the chalk 3, so that the chalk 3 is jammed in a chalk holding cavity inside the chalk holder 2, and after the chalk holder 2 is withdrawn, the stopper 1201 returns to the blocking position by elastic restoration of the spring member 1202.

In order to facilitate the chalk to be filled to be in a pending state, further, at least two spring-actuated mechanisms 120 are provided, a chalk temporary storage position 1200 is formed between at least two spring-actuated mechanisms 120, and the chalk temporary storage position 1200 is located below the discharge port 110 of the storage part 11. In this embodiment, it is preferable that three spring-actuated mechanisms 120 are provided, and the blocking members 1201 of each spring-actuated mechanism 120 are blocking strips, wherein two blocking members 1201 are respectively located at two sides above the other blocking member 1201, and form a triangular shape, so that the chalk can be prevented from falling, and after the chalk in the chalk temporary storage position 1200 is filled by the chalk sleeve 2, the next chalk automatically falls from the discharge port 110 to the chalk temporary storage position 1200 formed by the three blocking members 1201 and is undetermined.

In order to facilitate the blocking member 1201 to switch between the blocking position and the non-blocking position, further, the storage portion 11 includes a box 111 and a chalk storage cavity 112 disposed inside the box 111, the discharging port 110 is disposed at the bottom of the box 111 and is communicated with the chalk storage cavity 112, the elastic telescopic discharging portion 12 further includes a first sliding plate 121 and a second sliding plate 122 disposed at the bottom of the box 111 and located at one side of the discharging port 110, the first sliding plate 121 is located between the discharging port 110 and the second sliding plate 122, the blocking member 1201 sequentially penetrates through the first sliding plate 121 and the second sliding plate 122 and is in sliding fit with the first sliding plate 121 and the second sliding plate 122, so that a left half portion of the blocking member 1201 is located below the discharging port 110, a right half portion of the blocking member is located between the first sliding plate 121 and the second sliding plate 122, the spring member 1202 includes a supporting block 12021 fixedly disposed on the blocking member 1201 and a compression spring 12022 sleeved on the blocking member 1201, the abutting block 12021 and the compression spring 12022 are both positioned between the first sliding plate 121 and the second sliding plate 122, and the abutting block 12021 is positioned between the first sliding plate 121 and the compression spring 12022. The first sliding plate 121 and the second sliding plate 122 provide support for the blocking member 1201, the blocking member 1201 is arranged in parallel with the discharge port 110, when the chalk sleeve 2 pushes the blocking member 1201 along the axial direction of the chalk 3, the blocking member 1201 slides towards the direction close to the first sliding plate 121, the abutting block 12021 extrudes the compression spring 12022, the blocking member 1201 is enabled to be in a non-blocking position, and then when the chalk sleeve 2 is pushed out, the blocking member 1201 returns to a blocking state along with the chalk sleeve 2 under the elastic restoring force of the compression spring 12022, so that the previous chalk can be prevented from falling.

In order to prevent the chalk sleeve 2 from driving the next chalk to fall off in the process of withdrawing the filled chalk, further, when the chalk is in the chalk temporary storage position 1200 to be timed, the bottom of the chalk above the chalk temporary storage position 1200 is pressed on the top of the chalk in the chalk temporary storage position 1200, and the upper half part of the chalk above the chalk temporary storage position is located in the chalk storage cavity 112, so that the chalk sleeve 2 can be prevented from driving the upper chalk to be pulled out and fall off in the process of withdrawing the filled chalk.

In order to store chalk of different colors in a classified manner, a plurality of chalk storage cavities 112 are further provided, and three spring-actuated mechanisms 120 are arranged below the bottom discharge port 110 of each chalk storage cavity 112, so that the chalk sleeve 2 can be filled with chalk of different colors. Of course, the chalk holder 2 can be correspondingly provided with a plurality of chalk holders, which are respectively filled with chalks with different colors.

In order to facilitate visual observation of the amount of the chalk in the chalk storage cavity 112, the side wall of the box body 111 is a plate body made of transparent material, so that the amount of the chalk in the chalk storage cavity 112 can be conveniently and visually observed, and the chalk can be conveniently supplemented when the chalk is insufficient.

In order to facilitate the chalk sleeve 2 to smoothly push the spring actuating mechanism 120 to fill chalk, further, the chalk sleeve 2 includes an outer sleeve 21 and a clamping mechanism 22 movably disposed inside the outer sleeve 21 for clamping chalk 3, a position avoiding groove 210 is disposed on a side wall of the outer sleeve 21, an upper end of the position avoiding groove 210 penetrates through a top portion of the side wall of the outer sleeve 21, when the chalk sleeve 2 pushes the spring actuating mechanism 120 along an axial direction of the chalk 3, the position avoiding groove 210 faces upward, so that the outer sleeve 21 can avoid being abutted against the chalk above the chalk to be filled in the chalk temporary storage position 1200, and the chalk sleeve 2 can smoothly push the spring actuating mechanism 120 forward to fill chalk.

In order to clamp the chalk conveniently, further, the clamping mechanism 22 includes a support-retracting bottom block 221, at least two clamping plates 222 and support-retracting struts 223, which are disposed inside the outer casing 21, in this embodiment, three clamping plates 222 are provided, the positions of the three clamping plates 222 are respectively matched with the positions of the three blocking members 1201, the support-retracting bottom block 221 is located below the clamping plates 222, a support-retracting strut 223 is hinged between the support-retracting bottom block 221 and each clamping plate 222, the support-retracting strut 223 is disposed from the middle of the support-retracting bottom block 221 to the outer edge of the support-retracting bottom block, a chalk-accommodating cavity is formed between the inner walls of the three clamping plates 222, a support-retracting space is formed between the outer walls of the at least two clamping plates 222 and the inner wall of the outer casing 21, a clamping convex portion 2220 is disposed on the outer wall of the top of the clamping plates 222, the clamping convex portion 2220 is gradually thickened from bottom to top, so that a side wall thereof close to the outer casing 21 is an inclined surface, when the support-retracting bottom block 221 is pushed, the retracting and supporting bottom block 221 pushes the retracting and supporting support rod 223 upwards, the retracting and supporting support rod 223 pushes the clamping plates 222 outwards, the clamping plates 222 are expanded towards the periphery, the chalk clamping cavity is expanded, so that the chalk can be filled smoothly, meanwhile, the clamping convex portions 2220 of the clamping plates 222 extend out of the outer sleeve body 21, the end inlets of the chalk clamping cavity are expanded, when the avoiding grooves 210 are filled upwards, the end positions of the three clamping plates are just aligned with the ends of the three blocking pieces 1201, the end portions of the chalk in the chalk temporary storage position 1200 are just aligned with the end portions of the chalk clamping cavity, when the chalk sleeve 2 is pushed inwards, the three clamping plates gradually push the blocking pieces 1201 to the non-blocking position, the chalk is gradually clamped into the chalk clamping cavity, when the retracting and supporting bottom block 221 is pushed backwards, the retracting and supporting support rod 223 pulls the retracting and supporting support rod 223 downwards to fold the clamping plates 222 towards the middle part, the convex portions 2220 of the clamping plates 222 gradually abut against the inner wall of the outer sleeve body 21, the chalk is locked by the inner wall of each clamping plate 222.

Furthermore, the lower end of the support receiving rod 223 is hinged to the upper surface of the support receiving bottom block 221, the upper end of the support receiving rod 223 is hinged to the inner wall of the lower portion of the clamping plate 222, so that the lower end of the clamping plate 222 extends downward, when the support receiving rod 223 supports the clamping plates 222 outwards and abuts against the inner wall of the outer casing 21, the clamping plates 222 are in a vertical state of being attached to the inner wall of the outer casing 21, the upper end portion of the clamping plate 222 cannot incline towards the middle to reduce the inlet of the chalk clamping cavity, so that the chalk is not conveniently placed in the chalk clamping cavity, and the stable caliber of the inlet of the chalk clamping cavity is ensured to ensure that the chalk is smoothly placed in the chalk.

In order to facilitate pushing the support bottom block 221, the clamping mechanism 22 further includes a pushing member 224 connected to the support bottom block 221, a pushing sliding groove 211 is disposed on a lower side wall of the outer casing 21, the pushing sliding groove 211 is located right below the avoiding groove 210, the pushing member 224 is in sliding fit with the pushing sliding groove 211, and the support bottom block 221 can be pushed by pushing the pushing member 224.

Specifically, the clamping mechanism 22 further includes a connecting rod 225 disposed at the bottom end of the retracting and supporting bottom block 221, and a limit cap 226 disposed at the bottom end of the connecting rod 225, an upper outer wall of the connecting rod 225 is provided with a thread and is in threaded connection with the bottom of the retracting and supporting bottom block 221, the pushing member 224 includes a pushing block 2241, a pushing ring 2242, a pushing rod 2243 connected between the pushing block 2241 and the pushing ring 2242, the pushing ring 2242 is sleeved on the connecting rod 225, so that the pushing member 224 can rotate relative to the retracting and supporting bottom block 221, the limit cap 226 prevents the pushing ring 2242 from disengaging from the connecting rod 225, the pushing rod 2243 is in sliding connection with the pushing chute 211, the pushing block 2241 is located outside the outer casing 21, and an L-shaped locking slot 212 communicated with the pushing chute 211 is disposed on one side of the lower portion of the pushing chute 211 on the side wall of the outer casing 21. Through promoting to promote piece 2241, catch bar 2243 slides in promoting spout 211, promote ring 2242 then drives to receive and prop the bottom block 221 and slide, promote piece 2241 to L type locking slot 212 one side pushing down to one side deflection catch block 2241, can block catch bar 2243 card in L type locking slot 212, each grip block 222 is the state of drawing in at this moment and presss from both sides tight chalk, the cooperation of L type locking slot 212 and push piece 224 realizes the locking promptly, prevent that grip block 222 is not hard up.

Further, the clamping mechanism 22 further includes an extrusion spring 227 disposed inside the outer casing 21, an upper end of the extrusion spring 227 is connected to a bottom end of the limiting cap 226, a lower end of the extrusion spring 227 abuts against an inner wall of a bottom cover of the outer casing 21, the pushing rod 2243 is clamped into the L-shaped locking slot 212, the extrusion spring 227 is in a compressed state, and is convenient to elastically abut against the limiting cap 226 upwards, so that the pushing rod 2243 is abutted against the L-shaped locking slot 212 to prevent easy loosening.

In order to adjust the position of the shorter chalk in the chalk clamping cavity conveniently, the chalk sleeve 2 further comprises a pushing element 23 for pushing the worn and shortened chalk upwards, the pushing element 23 comprises a pushing plate 231, a pushing block 232 and a pushing rod 233 connected between the pushing plate 231 and the pushing block 232, the pushing plate 231 is located inside the chalk clamping cavity, the pushing rod 233 is in sliding fit with the avoiding groove 210, the pushing block 232 is located outside the outer sleeve body 21, the outer diameter of the pushing plate 231 is smaller than the inner diameter of the chalk clamping cavity when the clamping plate 222 is in a closed and clamped state, when the clamping plates 222 are in the opened state, the pushing block 232 is pushed, the pushing rod 233 slides in the avoiding groove 210, and the pushing plate 231 pushes the chalk to move upwards for a certain distance, so that the chalk extends out of the outer sleeve 21 for a proper length, and the chalk end does not need to be manually held for adjustment, and the chalk is prevented from contacting with the chalk during adjustment.

Furthermore, the automatic chalk device provided by the embodiment is suitable for filling chalks with consistent thickness, and the effect is optimal.

The using method of the automatic chalk device comprises the following steps:

s101: the pushing block 2241 of the chalk sleeve 2 is turned to make the pushing rod 2243 separate from the L-shaped locking slot 212 and enter the pushing chute 211;

s102: pushing the pushing block 2241 forward to make the pushing ring 2242 drive the support bottom block 221 to move upward;

s103: the support retracting bottom block 221 drives each clamping plate 222 to move upwards through the support retracting support rod 223, so as to unfold each clamping plate 222, so that the outer wall of each clamping plate 222 is abutted against the inner wall of the outer sleeve 21, and the upper end clamping convex part 2220 of each clamping plate 222 extends out of the outer sleeve 21;

s104: ensuring that the chalk storage cavity 112 of the chalk storage box 1 is filled with and stored with chalk, enabling the avoiding groove 210 of the outer sleeve body 21 to face upwards, aligning each clamping plate 222 with the end part of the blocking piece 1201 of each spring actuating mechanism 120 of the chalk storage box 1 respectively, pressing the pushing block 2241 and enabling each clamping plate 22 to push the blocking piece 1201 forwards, compressing the compression spring 12022, gradually moving the blocking piece 1201 to a non-blocking position in a direction close to the first sliding plate 121, and gradually clamping the chalk 3 in the chalk temporary storage position 1200 into the chalk clamping cavity between the clamping plates 222;

s105: pushing the pushing block 2241 backwards to make the pushing ring 2242 drive the support bottom block 221 to move downwards;

s106: the support-retracting bottom block 221 drives the clamping plates 222 to move downwards through the support-retracting support rods 223, and the clamping convex parts 2220 of the clamping plates 222 are tightly pressed against the inner wall of the outer sleeve 21, so that the inner wall of each clamping plate 222 clamps the chalk 3;

s107: gradually withdrawing the chalk sleeve 2 backwards from the chalk temporary storage position 1200, resetting each blocking piece 1201 to a blocking position along with the chalk sleeve 2 under the elastic force of the compression spring 12022, and enabling the previous chalk in the chalk storage cavity 112 to fall into the chalk temporary storage position 1200 to be determined;

s108: the pushing block 2241 is turned to enable the pushing rod 2243 to be clamped into the L-shaped locking clamping groove 212, and chalk filling is completed;

s109: after the chalk is gradually worn in the using process, the pushing block 2241 is turned to enable the pushing rod 2243 to be located in the pushing sliding groove 211; pushing the pushing block 2241 to open each clamping plate 222; pushing the pushing block 232 to make the pushing plate 231 push the chalk to move upwards to adjust the length of the chalk extending out of the outer sleeve 21; the pushing block 2241 is pushed down to enable the clamping plates 222 to clamp the chalk again, the pushing rod 2243 is clamped into the L-shaped locking clamping groove 212, the adjustment of the extending length of the worn chalk is completed, and the adjustment is convenient.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims (7)

1. An automatic chalk device is characterized in that:

comprises a chalk storage box (1) and a chalk sleeve (2) matched with the chalk storage box (1);

the chalk storage box (1) comprises a storage part (11) for storing chalk (3) and an elastic telescopic discharging part (12) for outputting the chalk (3), wherein the elastic telescopic discharging part (12) is arranged on one side of a discharging hole (110) of the storage part (11) and communicated with the inside of the storage part (11);

the elastic telescopic discharging part (12) comprises at least one spring actuating mechanism (120), when the chalk sleeve (2) pushes the spring actuating mechanism (120) along the axial direction of the chalk (3), the spring actuating mechanism (120) moves from a blocking position to a non-blocking position of the chalk (3), so that the chalk (3) is clamped into a chalk clamping cavity inside the chalk sleeve (2);

said at least one spring-actuated mechanism (120) comprising a linearly movable barrier (1201) and a spring member (1202) urging said barrier (1201) into said blocking position;

the spring actuating mechanism (120) is provided with at least two chalk temporary storage positions (1200) formed between the at least two spring actuating mechanisms (120);

the chalk temporary storage position (1200) is positioned below the discharge hole (110) of the storage part (11);

the storage part (11) comprises a box body (111) and a chalk storage cavity (112) arranged in the box body (111), and the discharge hole (110) is arranged at the bottom of the box body (111) and communicated with the chalk storage cavity (112);

the elastic telescopic discharging part (12) further comprises a first branch sliding plate (121) and a second branch sliding plate (122) which are arranged at the bottom of the box body (111) and located on one side of the discharging hole (110), and the first branch sliding plate (121) is located between the discharging hole (110) and the second branch sliding plate (122);

the blocking piece (1201) sequentially penetrates through the first branch sliding plate (121) and the second branch sliding plate (122), so that the left half part of the blocking piece (1201) is positioned below the discharge hole (110), and the right half part of the blocking piece (1201) is positioned between the first branch sliding plate (121) and the second branch sliding plate (122);

the spring component (1202) comprises a resisting block (12021) fixedly arranged on the blocking piece (1201) and a compression spring (12022) sleeved on the blocking piece (1201), the resisting block (12021) and the compression spring (12022) are located between the first sliding plate (121) and the second sliding plate (122), and the resisting block (12021) is located between the first sliding plate (121) and the compression spring (12022).

2. An automated chalk apparatus according to claim 1, characterized in that:

the chalk sleeve (2) comprises an outer sleeve body (21) and a clamping mechanism (22) which is movably arranged in the outer sleeve body (21) and used for clamping the chalk (3);

an avoiding groove (210) is formed in the side wall of the outer sleeve body (21);

when the chalk sleeve (2) pushes the spring actuating mechanism (120) along the axial direction of the chalk (3), the position avoiding groove (210) can enable the outer sleeve body (21) to avoid contacting the chalk above the chalk in the chalk temporary storage position (1200).

3. An automated chalk apparatus according to claim 2, characterized in that:

the clamping mechanism (22) comprises a retracting and supporting bottom block (221), at least two clamping plates (222) and retracting and supporting support rods (223) which are arranged inside the outer sleeve body (21);

the folding and supporting bottom block (221) is positioned below the clamping plate (222);

the retracting and supporting support rod (223) is hinged between the retracting and supporting bottom block (221) and each clamping plate (222);

the chalk clamping cavity is formed between at least two clamping plates (222);

a retracting space is formed between the outer wall of at least two clamping plates (222) and the inner wall of the outer sleeve body (21);

clamping convex parts (2220) are arranged on the outer wall of the top of the clamping plates (222), and when the support folding bottom block (221) is pushed, the clamping convex parts (2220) of at least two clamping plates (222) extend out of the outer sleeve body (21).

4. An automated chalk apparatus according to claim 3, characterized in that:

the clamping mechanism (22) further comprises a pushing piece (224) connected with the support retracting bottom block (221);

the side wall of the lower part of the outer sleeve body (21) is provided with a pushing sliding groove (211);

the pushing piece (224) is in sliding fit with the pushing sliding groove (211).

5. An automated chalk apparatus according to claim 4, characterized in that:

the clamping mechanism (22) further comprises a connecting rod (225) arranged at the bottom end of the support retracting bottom block (221) and a limiting cap (226) arranged at the bottom end of the connecting rod (225);

the pushing piece (224) comprises a pushing block (2241), a pushing ring (2242) and a pushing rod (2243) connected between the pushing block (2241) and the pushing ring (2242);

the pushing ring (2242) is sleeved on the connecting rod (225);

the push rod (2243) is connected with the push sliding groove (211) in a sliding mode;

the pushing block (2241) is positioned outside the outer sleeve body (21);

an L-shaped locking clamping groove (212) communicated with the pushing sliding groove (211) is formed in one side, located on the pushing sliding groove (211), of the side wall of the outer sleeve body (21).

6. An automated chalk apparatus according to claim 3, characterized in that:

the chalk sleeve (2) further comprises a pushing piece (23) used for pushing the worn shortened chalk upwards;

the pushing and moving piece (23) comprises a pushing and moving plate (231), a pushing and moving block (232) and a pushing and moving rod (233) connected between the pushing and moving plate (231) and the pushing and moving block (232);

the pushing plate (231) is positioned inside the chalk clamping cavity;

the pushing rod (233) is in sliding fit with the avoiding groove (210);

the pushing block (232) is located outside the outer sleeve body (21).

7. The method for using an automatic chalk device according to any one of claims 1 to 6, characterized by comprising the following steps:

s101: a pushing block (2241) of the chalk sleeve (2) is turned to enable a pushing rod (2243) to be located in the pushing sliding groove (211);

s102: the pushing block (2241) is pushed forwards, so that the pushing ring (2242) drives the support bottom block (221) to move upwards;

s103: the retracting and supporting bottom block (221) drives each clamping plate (222) to move upwards through retracting and supporting support rods (223), each clamping plate (222) is expanded, the outer wall of each clamping plate (222) is abutted against the inner wall of the outer sleeve body (21), and the upper end clamping convex part (2220) of each clamping plate (222) extends out of the outer sleeve body (21);

s104: the position avoiding groove (210) of the outer sleeve body (21) faces upwards, the clamping plates (222) are respectively aligned with the end parts of the blocking parts (1201) of the spring actuating mechanisms (120) of the chalk storage box (1), the pushing block (2241) is pressed, the clamping plates (222) push the blocking parts (1201) forwards, the compression springs (12022) are compressed, the blocking parts (1201) move to the non-blocking position gradually towards the direction close to the first sliding plate (121), and chalks (3) in the chalk temporary storage position (1200) are gradually clamped into chalk clamping cavities between the clamping plates (222);

s105: pushing the pushing block (2241) backwards to enable the pushing ring (2242) to drive the support folding bottom block (221) to move downwards;

s106: the retracting and supporting bottom block (221) drives the clamping plates (222) to move downwards through the retracting and supporting support rod (223), and clamping convex parts (2220) of the clamping plates (222) are pressed against the inner wall of the outer sleeve body (21), so that the inner wall of each clamping plate (222) clamps the chalk (3);

s107: gradually withdrawing the chalk sleeve (2) backwards out of the chalk temporary storage position (1200), resetting each blocking piece (1201) to a blocking position under the elastic force of the compression spring (12022), and enabling the previous chalk in the chalk storage cavity (112) to fall into the chalk temporary storage position (1200);

s108: the pushing block (2241) is turned to enable the pushing rod (2243) to be clamped into the L-shaped locking clamping groove (212) to finish chalk filling;

s109: after the chalk is gradually worn in the using process, the pushing block (2241) is turned to enable the pushing rod (2243) to be located in the pushing sliding groove (211); pushing the pushing block (2241) to expand the clamping plates (222); pushing the pushing block (232) to enable the pushing plate (231) to push the chalk to move upwards so as to adjust the length of the chalk extending out of the outer sleeve body (21); and pushing down the pushing block (2241) to enable the clamping plates (222) to clamp the chalk again, and clamping the pushing rod (2243) into the L-shaped locking clamping groove (212) to complete the adjustment of the extending length of the worn chalk.

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