CN112477477A

CN112477477A - Self-cleaning telescopic blackboard device

Info

Publication number: CN112477477A
Application number: CN202110035691.9A
Authority: CN
Inventors: 童银辉; 孙聪; 郭未恺
Original assignee: Ningbo University
Current assignee: Ningbo University
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-03-12
Anticipated expiration: 2041-01-12
Also published as: CN112477477B

Abstract

The invention discloses a self-cleaning telescopic blackboard device, which comprises a pair of fixed frames and blackboard cloth, wherein the fixed frames are fixed on a wall, an upper transmission roller set, a lower transmission roller set and a traction roller are arranged between the fixed frames, the blackboard cloth is respectively matched with the upper transmission roller set, the lower transmission roller set and the traction roller, a motor is arranged in the middle of the fixed frames and is respectively matched with a telescopic mechanism and a transmission mechanism, a cleaning mechanism is also arranged at the lower part of the fixed frames and is matched with the transmission mechanism, a heating plate is also arranged between the fixed frames and can respectively heat the blackboard cloth and the cleaning mechanism, and the traction roller is matched with the transmission mechanism; the grooved pulley is installed through the one-way bearing in the rotating shaft, the grooved pulley and the traction roller are fixedly connected through the traction rope, the traction roller can be lifted through the traction rope through the rotation of the motor, the transmission roller set can be driven to slide downwards along the upper chute through the pulling of the blackboard cloth in the lifting process of the traction roller, and therefore the writing is convenient and comfortable.

Description

Self-cleaning telescopic blackboard device

Technical Field

The invention relates to the field of office teaching tools, in particular to a self-cleaning telescopic blackboard device.

Background

The blackboard is the teaching tool that every classroom of every school can be equipped with, and current blackboard is generally fixed, mr need erase after writing on the blackboard with the chalk and just can continue to write, however the chalk dust on the in-process blackboard of erasing the blackboard is pervaded near the blackboard, easily waft to in the people's of erasing the blackboard eyes or be inhaled the nasal cavity in, thereby arouse various diseases, current blackboard generally sets up all higher simultaneously, because people's height is different, and then also different to the utilization ratio of blackboard, this waste that has just caused a blackboard resource.

Therefore, in order to protect the health of the teacher and to fully utilize teaching resources, a blackboard which has an automatic cleaning function and can be stretched and retracted is urgently needed.

Disclosure of Invention

The invention provides a self-cleaning telescopic blackboard device aiming at the situation in the background technology, which replaces the existing fixed blackboard by flexible blackboard cloth, realizes self cleaning and telescopic under the action of a telescopic mechanism and a cleaning mechanism, and effectively solves the problems in the background technology.

In order to solve the technical problem, the invention is solved by the following technical scheme: a self-cleaning telescopic blackboard device comprises a pair of fixing frames and a blackboard cloth, wherein the fixing frames are fixed on a wall, an upper driving roller set is slidably arranged at the upper part between the fixed frames, symmetrical lower driving roller sets are arranged at the lower part, a traction roller is also slidably arranged between the lower transmission roller sets, the blackboard cloth is respectively matched with the upper transmission roller sets, the lower transmission roller sets and the traction roller, a motor is arranged in the middle of the fixed frame at one side, the motor is respectively matched with the telescopic mechanism and the transmission mechanism, the lower part of the fixed frame is also provided with a cleaning mechanism, the cleaning mechanism is matched with the transmission mechanism, a heating plate is also arranged between the fixed frames, the heating plate can respectively heat the blackboard cloth and the cleaning mechanism, the traction roller is matched with the transmission mechanism through a stop block fixed at the end part, and the stretching and the cleaning of the blackboard cloth can be respectively realized through the positive and negative rotation of the motor.

Preferably, mount upper portion is equipped with a pair of symmetrical last spout, and the lower part is equipped with down the spout, go up the drive roll group and include a pair of drive roll of going up, go up the drive roll respectively with go up spout sliding fit, the carry over pinch rolls with lower chute fit, lower drive roll group includes a pair of lower drive roll, lower drive roll with mount normal running fit, go up the drive roll below and install the overhead gage, the lower drive roll top is installed down the baffle, go up the baffle both ends with go up the cooperation of drive roll both ends, down the baffle both ends with the cooperation of lower drive roll both ends, baffle both sides upper end still is equipped with the spacing groove down, the overhead gage with the spacing groove cooperation.

Preferably, the upper chute is internally provided with a supporting block, the supporting block is matched with the end part of the upper transmission roller, positioning grooves are formed in two sides of the supporting block and matched with the side wall of the upper chute, a guide rod is fixed at the bottom of the supporting block, a return spring is installed on the guide rod, and the guide rod is matched with a guide hole formed in the bottom of the upper chute.

Preferably, the telescopic mechanism comprises a rotating shaft and a traction rope, the rotating shaft is connected with the output end of the motor, a grooved wheel is installed on the rotating shaft through a one-way bearing, and two ends of the traction rope are respectively fixedly connected with the grooved wheel and the traction roller.

Preferably, drive mechanism includes that main bevel gear, drive disk assembly and switching-over part constitute, main bevel gear installs the output of motor, drive disk assembly with switching-over part all with the mount passes through the support frame and rotates the connection, drive disk assembly with the cooperation of switching-over part, switching-over part and one side the cooperation of lower driving roller.

Preferably, the transmission part comprises a transmission shaft and a transmission master gear, the transmission shaft is in running fit with the fixing frame, a transmission bevel gear is installed at the upper end of the transmission shaft and is matched with the main bevel gear, a spline is arranged on the side wall of the lower part of the transmission shaft, the transmission master gear is installed on the transmission shaft and is matched with the spline through a spline groove, an ejection spring is installed at the lower part of the transmission shaft and is matched with the lower end of the transmission master gear, and the upper end of the transmission master gear is also matched with the stop block.

Preferably, the reversing component comprises a reversing shaft, the reversing shaft is rotatably connected with the fixing frame, a transmission pinion is mounted in the middle of the reversing shaft, an upper bevel gear and a lower bevel gear are mounted at the upper end and the lower end of the reversing shaft respectively, the transmission pinion is matched with the transmission main gear, the lower bevel gear is matched with a pinion mounted at the end of the lower transmission roller, and the upper bevel gear is matched with the cleaning mechanism.

Preferably, the cleaning mechanism comprises a driving bevel gear, a sprinkling mechanism and a wiping mechanism, the driving bevel gear is rotationally connected with the fixing frame, the driving bevel gear is matched with the upper bevel gear, an eccentric pin shaft is further fixed on the end part of the driving bevel gear, and the eccentric pin shaft is respectively matched with the sprinkling mechanism and the wiping mechanism.

Preferably, watering mechanism is including taking out hydraulic cylinder, water tank and water catch bowl, take out the hydraulic cylinder and install the piston, the piston pass through the piston rod with the cooperation of eccentric pin axle, take out hydraulic cylinder tip still respectively with inlet tube and outlet pipe intercommunication, the inlet tube with all be equipped with the check valve in the outlet pipe, inlet tube and water tank intercommunication, outlet pipe and sprinkler pipe intercommunication, the sprinkler pipe lateral wall is equipped with a plurality of evenly distributed's apopore, the sprinkler pipe both ends with mount fixed connection, the apopore is close to and just right blackboard cloth, the water catch bowl both ends with mount fixed connection, and be located the sprinkler pipe below, the sprinkler pipe tip still communicates there is the drain pipe.

Preferably, the wiping mechanism comprises a wiping roller and a connecting rod group, two ends of the wiping roller are respectively matched with a sliding groove formed in the fixing frame, the wiping roller is in contact fit with the blackboard cloth, and the end part of the wiping roller and the eccentric pin shaft form a crank sliding block mechanism through the connecting rod group.

The invention has the beneficial effects that:

1. the grooved pulley is installed through the one-way bearing in the rotating shaft, the grooved pulley and the traction roller are fixedly connected through the traction rope, the traction roller can be lifted through the traction rope through the rotation of the motor, the transmission roller set can be driven to slide downwards along the upper chute through the pulling of the blackboard cloth in the lifting process of the traction roller, and therefore the writing is convenient and comfortable.

2. Through side installation drive mechanism at the fixed plate and at blackboard cloth's back lower part installation watering mechanism and wiping mechanism, drive mechanism through the motor and rotate, and then drive the driving roller and rotate, also drive watering mechanism and wiping mechanism simultaneously and start, realize that blackboard cloth trades the face and sprinkle, clean and dry, need not the manual work and clean, also can not produce chalk dust, the effectual physical and mental health who guarantees the user.

Drawings

Fig. 1 and 2 are schematic structural views of the present invention.

Fig. 3 is a right side sectional view of the present invention.

Fig. 4 is a right side view of the invention.

FIG. 5 is a schematic view of the construction of the drive roller set and baffle set of the present invention.

Fig. 6 is a schematic structural view of the telescopic mechanism of the present invention.

Fig. 7 is an enlarged view of the invention at section a of fig. 2.

Fig. 8 is an enlarged view of the invention at detail B of fig. 4.

Fig. 9 is an enlarged view of the invention at section C of fig. 5.

Fig. 10 is an enlarged view of the invention at section D in fig. 6.

Fig. 11 is an enlarged view of the invention at section E of fig. 7.

In the figure: the blackboard cleaning machine comprises a fixed frame 1, an upper chute 101, a lower chute 102, a water collecting tank 103, a water discharging pipe 104, a chute 105, a driving bevel gear 106, an eccentric pin shaft 107, an upper driving roller 201, a lower driving roller 202, an upper baffle 203, a lower baffle 204, a limiting groove 205, a supporting block 206, a positioning groove 207, a guide rod 208, a return spring 209, a secondary bevel gear 210, a motor 301, a rotating shaft 302, a main bevel gear 303, a traction rope 304, a traction roller 305, a stopper 306, a grooved pulley 307, a heating plate 4, a transmission shaft 501, a transmission bevel gear 502, a transmission main gear 503, an ejection spring 504, a transmission secondary gear 601, an upper bevel gear 602, a lower bevel gear 603, a liquid pumping cylinder 701, a piston rod 702, a water inlet pipe 703, a water outlet pipe 704, a water spraying pipe 705, a one-way valve 706, a.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any creative effort, are within the protection scope of the present invention.

The embodiment is as shown in fig. 1 to 11, a self-cleaning telescopic blackboard device, comprising a pair of fixed frames 1 and blackboard cloth 9, the fixed frames 1 are fixed on the wall, an upper sliding installation between the fixed frames 1 is provided with an upper transmission roller 201 group, the lower part is provided with a symmetrical lower transmission roller 202 group, a lower sliding installation between the lower transmission roller 202 group is provided with a traction roller 305, the blackboard cloth 9 is respectively matched with the upper transmission roller 201 group, the lower transmission roller 202 group and the traction roller 305, the middle part of the fixed frame 1 is provided with a motor 301, the motor 301 is respectively matched with a telescopic mechanism and a transmission mechanism, the lower part of the fixed frame 1 is also provided with a cleaning mechanism, the cleaning mechanism is matched with the transmission mechanism, a heating plate 4 is also arranged between the fixed frames 1, the heating plate 4 can respectively heat the blackboard cloth 9 and the cleaning mechanism, the traction roller 305 is also matched with the transmission mechanism through a stop block 306 fixed at the end part, and the stretching and the cleaning of the blackboard cloth 9 can be respectively realized through the forward and reverse rotation of the motor 301.

The upper portion of the fixing frame 1 is provided with a pair of symmetrical upper chutes 101, the lower portion of the fixing frame is provided with a lower chute 102, the upper transmission roller 201 group comprises a pair of upper transmission rollers 201, the upper transmission rollers 201 are respectively in sliding fit with the upper chutes 101, the traction roller 305 is matched with the lower chute 102, the lower transmission roller 202 group comprises a pair of lower transmission rollers 202, the lower transmission rollers 202 are in rotating fit with the fixing frame 1, an upper baffle 203 is installed below the upper transmission rollers 201, a lower baffle 204 is installed above the lower transmission rollers 202, two ends of the upper baffle 203 are matched with two ends of the upper transmission rollers 201, two ends of the lower baffle 204 are matched with two ends of the lower transmission rollers 202, the upper ends of two sides of the lower baffle 204 are further provided with limiting grooves 205, and the upper baffle 203 is matched with the limiting grooves 205.

A supporting block 206 is further installed in the upper chute 101, the supporting block 206 is matched with the end portion of the upper transmission roller 201, positioning grooves 207 are formed in two sides of the supporting block 206, the positioning grooves 207 are matched with the side wall of the upper chute 101, a guide rod 208 is fixed at the bottom of the supporting block 206, a return spring 209 is installed on the guide rod 208, and the guide rod 208 is matched with a guide hole formed in the bottom of the upper chute 101.

The telescopic mechanism comprises a rotating shaft 302 and a traction rope 304, the rotating shaft 302 is connected with the output end of the motor 301, a grooved pulley 307 is installed on the rotating shaft 302 through a one-way bearing, and two ends of the traction rope 304 are respectively fixedly connected with the grooved pulley 307 and the traction roller 305.

Drive mechanism includes that main bevel gear 303, drive disk assembly and switching-over part constitute, main bevel gear 303 is installed the output of motor 301, drive disk assembly with the switching-over part all with mount 1 passes through the support frame and rotates the connection, drive disk assembly with the cooperation of switching-over part, switching-over part and one side the cooperation of lower driving roller 202.

The transmission component comprises a transmission shaft 501 and a transmission main gear 503, the transmission shaft 501 is in running fit with the fixed frame 1, a transmission bevel gear 502 is installed at the upper end of the transmission shaft 501, the transmission bevel gear 502 is matched with the main bevel gear 303, a spline is arranged on the side wall of the lower part of the transmission shaft 501, the transmission main gear 503 is installed on the transmission shaft 501 and is matched with the spline through a spline groove, an ejection spring 504 is installed at the lower part of the transmission shaft 501, the ejection spring 504 is matched with the lower end of the transmission main gear 503, and the upper end of the transmission main gear 503 is also matched with the stopper 306.

The reversing component comprises a reversing shaft, the reversing shaft is rotatably connected with the fixing frame 1, a transmission pinion 601 is mounted in the middle of the reversing shaft, an upper bevel gear 602 and a lower bevel gear 603 are mounted at the upper end and the lower end of the reversing shaft respectively, the transmission pinion 601 is matched with the transmission main gear 503, the lower bevel gear 603 is matched with one side of a pinion 210 mounted at the end part of the lower transmission roller 202, and the upper bevel gear 602 is matched with the cleaning mechanism.

The cleaning mechanism comprises a driving bevel gear 106, a sprinkling mechanism and a wiping mechanism, the driving bevel gear 106 is rotationally connected with the fixed frame 1, the driving bevel gear 106 is matched with the upper bevel gear 602, an eccentric pin shaft 107 is further fixed on the end part of the driving bevel gear 106, and the eccentric pin shaft 107 is respectively matched with the sprinkling mechanism and the wiping mechanism.

The watering mechanism is including taking out liquid cylinder 701, water tank and water catch bowl 103, take out and install the piston in the liquid cylinder 701, the piston pass through piston rod 702 with the cooperation of eccentric round pin axle 107, take out liquid cylinder 701 tip still respectively with inlet tube 703 and outlet pipe 704 intercommunication, inlet tube 703 with all be equipped with check valve 706 in the outlet pipe 704, inlet tube 703 and water tank intercommunication, outlet pipe 704 and sprinkler 705 intercommunication, sprinkler 705 lateral wall is equipped with a plurality of evenly distributed's apopore, sprinkler 705 both ends with mount 1 fixed connection, the apopore is close to and just right blackboard cloth 9, water catch bowl 103 both ends with mount 1 fixed connection, and be located sprinkler 705 below, sprinkler 705 tip still communicates there is drain pipe 104.

The wiping mechanism comprises a wiping roller 801 and a connecting rod group 802, two ends of the wiping roller 801 are respectively matched with the sliding groove 105 arranged on the fixing frame 1, the wiping roller 801 is in contact fit with the blackboard cloth 9, and the end part of the wiping roller 801 further forms a crank sliding block mechanism with the eccentric pin 107 through the connecting rod group 802.

The specific working process is as follows: when the blackboard device needs to be used, the blackboard device is in an initial state, at the moment, the upper transmission roller 201 is positioned at the lower end of the upper chute 101, the return spring 209 is in a compressed state, the traction roller 305 is positioned at the upper end of the lower chute 102, the transmission main gear 503 is disengaged from the transmission pinion 601 under the action of the ejection spring 504, namely, the blackboard device is in a contracted state at the moment, and therefore, the user can conveniently write, when the blackboard device writes to the bottom of the blackboard cloth 9, the motor 301 rotates forwards to drive the grooved pulley 307 on the rotating shaft 302 to rotate, at the moment, the traction rope 304 wound in the grooved pulley 307 is released, namely, the traction roller 305 slides downwards along the lower chute 102, the upper transmission roller 201 slides upwards along the upper chute 101 under the action of the elastic force of the return spring 209, and further drives the content written on the front surface of the blackboard cloth 9 to move upwards, and then the user can continue to write in a blank space, during the whole writing process, the transmission shaft 501 is in an idle running state, when the front surface of the blackboard cloth 9 is in a maximum unfolding state, the motor 301 stops rotating forwards, the traction roller 305 is located at the lower end of the lower chute 102, the upper transmission roller 201 is located at the upper end of the upper chute 101, and the stop block 306 fixed to the end of the traction roller 305 presses the transmission main gear 503 downwards along the transmission shaft 501 to be meshed with the transmission pinion 601.

When the content written on the front surface of the blackboard cloth 9 needs to be wiped, only the motor 301 needs to rotate reversely, since the upper grooved wheel 307 of the rotating shaft 302 is matched with the rotating shaft 302 through the one-way bearing, at this moment, the grooved wheel 307 cannot drive the traction roller 305 to move upwards, at this moment, the transmission shaft 501 drives the transmission auxiliary gear 601 to rotate through the transmission main gear 503, further drives the lower bevel gear 603 to be meshed with the auxiliary bevel gear 210 on the lower transmission roller 202, further drives the lower transmission roller 202 to rotate, thereby changing the surface of the blackboard cloth 9, changing the clean back surface to the front surface, changing the front surface with written characters to the back surface, during the surface changing process, the upper bevel gear 602 drives the driving bevel gear 106 to rotate, the driving bevel gear 106 drives the sprinkling mechanism and the wiping mechanism to work simultaneously through the eccentric pin shaft 107, the sprinkling mechanism pumps the water in the water tank into the sprinkling pipe 705 under the action of the liquid pumping cylinder 701, the water inlet pipe 704 and the one-way valve 706 in the water outlet pipe 704 to wet the, then, the wet blackboard cloth 9 is continuously and repeatedly wiped by the wiping roller 801 on the wiping mechanism, the wiped blackboard cloth 9 is dried by the heating plate 4, the heating plate 4 also dries the wiping roller 801 at the same time, and the sewage wiped on the blackboard cloth 9 can flow into the water collecting tank 103 and is discharged through the water discharging pipe 104.

After the surface is changed, the motor 301 continues to rotate forwards, and the traction roller 305 is pulled to move upwards under the action of the traction rope 304, so that the engagement between the transmission main gear 503 and the transmission pinion 601 is released, and finally the blackboard device is retracted to the minimum state again, thereby being convenient for a user to use.

Claims

1. The utility model provides a flexible blackboard device of automatically cleaning, includes a pair of mount (1) and blackboard cloth (9), mount (1) is fixed on the wall, its characterized in that: an upper transmission roller set is slidably mounted on the upper portion between the fixing frame (1), a symmetrical lower transmission roller set is mounted on the lower portion, a traction roller (305) is further slidably mounted between the lower transmission roller set, the blackboard cloth (9) is respectively matched with the upper transmission roller set, the lower transmission roller set and the traction roller (305), a motor (301) is mounted in the middle of the fixing frame (1) on one side, the motor (301) is respectively matched with a telescopic mechanism and a transmission mechanism, a cleaning mechanism is further mounted on the lower portion of the fixing frame (1), the cleaning mechanism is matched with the transmission mechanism, the traction roller (305) is further matched with the transmission mechanism through a stop block (306) fixed at the end portion, a heating plate (4) is further mounted between the fixing frame (1), and the heating plate can respectively heat the blackboard cloth (9) and the cleaning mechanism, the black board cloth (9) can be stretched and cleaned by the positive and negative rotation of the motor (301).

2. The self-cleaning telescopic blackboard apparatus of claim 1, wherein: the upper part of the fixing frame (1) is provided with a pair of symmetrical upper chutes (101), the lower part is provided with a lower chute (102), the upper transmission roller group comprises a pair of upper transmission rollers (201), the upper transmission rollers (201) are respectively in sliding fit with the upper sliding chutes (101), the pull roll (305) cooperates with the lower chute (102), the lower set of drive rolls includes a pair of lower drive rolls (202), the lower transmission roller (202) is in running fit with the fixed frame (1), an upper baffle (203) is arranged below the upper transmission roller (201), a lower baffle (204) is arranged above the lower transmission roller (202), two ends of the upper baffle (203) are matched with two ends of the upper transmission roller (201), two ends of the lower baffle (204) are matched with two ends of the lower driving roller (202), the upper end of the two sides of the lower baffle (204) is also provided with a limiting groove (205), and the upper baffle (203) is matched with the limiting groove (205).

3. The self-cleaning telescopic blackboard apparatus of claim 2, wherein: the automatic feeding device is characterized in that a supporting block (206) is further installed in the upper sliding groove (101), the supporting block (206) is matched with the end portion of the upper transmission roller (201), positioning grooves (207) are formed in two sides of the supporting block (206), the positioning grooves (207) are matched with the side wall of the upper sliding groove (101), a guide rod (208) is fixed to the bottom of the supporting block (206), a reset spring (209) is installed on the guide rod (208), and the guide rod (208) is matched with a guide hole formed in the bottom of the upper sliding groove (101).

4. The self-cleaning telescopic blackboard apparatus of claim 1, wherein: the telescopic mechanism comprises a rotating shaft (302) and a traction rope (304), the rotating shaft (302) is connected with the output end of the motor (301), a grooved pulley (307) is installed on the rotating shaft (302) through a one-way bearing, and two ends of the traction rope (304) are fixedly connected with the grooved pulley (307) and the traction roller (305) respectively.

5. The self-cleaning telescopic blackboard apparatus of claim 1, wherein: drive mechanism includes main bevel gear (303), drive disk assembly and switching-over part and constitutes, main bevel gear (303) are installed the output of motor (301), drive disk assembly with the switching-over part all with mount (1) is passed through the support frame and is rotated and is connected, drive disk assembly with the cooperation of switching-over part, switching-over part and one side transmission roller (202) cooperation down.

6. The self-cleaning telescopic blackboard apparatus of claim 5, wherein: the transmission part comprises a transmission shaft (501) and a transmission main gear (503), the transmission shaft (501) is in running fit with the fixed frame (1), a transmission bevel gear (502) is installed at the upper end of the transmission shaft (501), the transmission bevel gear (502) is matched with the main bevel gear (303), a spline is arranged on the side wall of the lower portion of the transmission shaft (501), the transmission main gear (503) is installed on the transmission shaft (501) and is matched with the spline through a spline groove, an ejection spring (504) is installed at the lower portion of the transmission shaft (501), the ejection spring (504) is matched with the lower end of the transmission main gear (503), and the upper end of the transmission main gear (503) is further matched with the stopper (306).

7. The self-cleaning telescopic blackboard apparatus of claim 6, wherein: the switching-over part includes the reversing shaft, the reversing shaft with mount (1) rotates to be connected, reversing shaft mid-mounting has transmission pinion (601), bevel gear (602) and lower bevel gear (603) are installed respectively to the lower extreme of reversing shaft, transmission pinion (601) with transmission master gear (503) cooperation, bevel gear (603) and one side down vice bevel gear (210) cooperation of transmission roller (202) tip installation down, go up bevel gear (602) with wiper mechanism cooperation.

8. The self-cleaning telescopic blackboard apparatus of claim 7, wherein: the cleaning mechanism comprises a driving bevel gear (106), a sprinkling mechanism and a wiping mechanism, the driving bevel gear (106) is rotationally connected with the fixed frame (1), the driving bevel gear (106) is matched with the upper bevel gear (602), an eccentric pin shaft (107) is further fixed on the end part of the driving bevel gear (106), and the eccentric pin shaft (107) is respectively matched with the sprinkling mechanism and the wiping mechanism.

9. The self-cleaning telescopic blackboard apparatus of claim 8, wherein: the sprinkling mechanism comprises a liquid pumping cylinder (701), a water tank and a water collecting tank (103), wherein a piston is installed in the liquid pumping cylinder (701), the piston is matched with the eccentric pin shaft (107) through a piston rod (702), the end part of the liquid pumping cylinder (701) is also communicated with a water inlet pipe (703) and a water outlet pipe (704) respectively, a one-way valve (706) is arranged in each of the water inlet pipe (703) and the water outlet pipe (704), the water inlet pipe (703) is communicated with the water tank, the water outlet pipe (704) is communicated with a sprinkling pipe (705), a plurality of water outlet holes which are uniformly distributed are formed in the side wall of the sprinkling pipe (705), two ends of the sprinkling pipe (705) are fixedly connected with the fixing frame (1), the water outlet holes are close to and just opposite to the blackboard cloth (9), two ends of the water collecting tank (103) are fixedly connected with the fixing frame (1) and are positioned below the, the end part of the sprinkler pipe (705) is also communicated with a drain pipe (104).

10. The self-cleaning telescopic blackboard apparatus of claim 8, wherein: wiping mechanism includes wiping roller (801) and link group (802), wiping roller (801) both ends respectively with spout (105) cooperation that are equipped with on mount (1), wiping roller (801) with blackboard cloth (9) contact cooperation, wiping roller (801) tip still passes through link group (802) with crank block mechanism is constituteed to eccentric round pin axle (107).