CN103950320B - A kind of rolling type white board - Google Patents

Abstract

The invention discloses a rolling whiteboard, which belongs to the field of teaching appliances. A rolling whiteboard of the present invention is composed of a rectangular frame, a curtain, an upper rotating roller adjustment mechanism, a lower rotating roller driving mechanism, an eraser roller fixing mechanism, an eraser roller driving mechanism, a power switch, a dial switch and a power supply box. Component composition. The rolling whiteboard of the present invention has simple structure, convenient assembly and disassembly, and compact overall structure. The curtain can be rotated circularly and can be wiped automatically, which reduces labor intensity and improves the teaching environment.

Description

A rolling whiteboard

technical field

The invention relates to a teaching tool, more specifically, to a rolling whiteboard.

Background technique

The blackboard that existing teaching is used is the blackboard that materials such as wooden or frosted glass or iron porcelain are made, and its main drawback is: 1, because dust flies up when wiping, seriously pollutes teaching environment, long-term contact chalk dust can have bad influence on teacher and student health, Simultaneously, the user is also prone to eat chalk dust when standing on tiptoe and raising the arm to write upwards; At the same time, in order not to waste the use area of the blackboard, it is more laborious and laborious to write on the top and bottom of the blackboard; The observation of students' ears, eyes, hands and brain affects the learning effect; 4. During the writing with chalk and erasing by hand, the blackboard surface is easily damaged and aged, causing fading, reflection, unclear handwriting, and damage to students' vision; 5. The writing area of the blackboard is relatively limited; 6. It is very inconvenient to set up a screen separately during slideshow teaching.

Therefore, there is an urgent need in this area for a blackboard or whiteboard that is easy to use, suitable for users of different heights, and without chalk dust.

Contents of the invention

1. The technical problem to be solved by the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies and provide a rolling whiteboard. The technical solution of the present invention is simple in structure, convenient in disassembly and assembly, compact in overall structure, and the curtain can be rotated circularly and wiped automatically, reducing labor intensity. , Improved the teaching environment.

2. Technical solution

In order to achieve the above object, the technical scheme provided by the invention is:

A rolling whiteboard of the present invention comprises a rectangular frame, a curtain, an upper rotating roller adjustment mechanism, a lower rotating roller driving mechanism, an eraser roller fixing mechanism and an eraser roller driving mechanism, and the frame includes a right column, a left column, For the lower beam and the upper beam, an upper rotating roller is arranged above the frame; the two ends of the upper rotating roller are respectively connected with the right column and the left column through the upper rotating roller adjustment mechanism; the frame is provided with The lower rotating roller, which is located below the lower beam; the right end of the lower rotating roller passes through the bearing seat with bearings and the right column in turn and is connected with the driving mechanism of the lower rotating roller; the left end of the lower rotating roller After going through the bearing seat with bearings and the left column in turn, it is connected to the drive mechanism of the eraser roller; the above-mentioned upper rotating roller and the lower rotating roller are parallel to each other, and the closed ring-shaped curtain is used to convey the belt between the upper rotating roller and the lower rotating roller. The bottom of the frame is provided with an eraser roller that is controlled by the eraser roller drive mechanism to move left and right; the eraser roller is in tight contact with the above-mentioned curtain; the two ends of the eraser roller pass through the eraser roller fixing mechanism Connect with the right column and the left column respectively.

Furthermore, the upper rotating roller adjustment mechanism includes a bearing housing mounting seat and an adjusting bolt; the right side of the right column and the left side of the left column are fixedly connected with a fixed mounting seat; the adjusting bolt passes through After the installation seat is fixed, it is fixedly connected with the bearing seat installation seat; the bearing seat with bearing is fixedly connected with the bearing seat, and the bearing seat with bearing is respectively sleeved on the two ends of the above-mentioned upper rotating roller.

Furthermore, the driving mechanism of the lower rotating roller includes a motor fixedly installed on the upper surface of the lower beam, a coupling, a driving wheel, a driven wheel sleeved on the right end of the lower rotating roller, a first rotating shaft and a synchronous belt. The motor The output shaft is connected with one end of the first rotating shaft through a coupling, and the other end of the first rotating shaft passes through the right column and is connected with the driving wheel; the driving wheel is connected with the driven wheel through a synchronous belt.

Furthermore, the said eraser roller drive mechanism includes a first bevel gear sleeved on the left end of the lower rotating roller, a second rotating shaft, a second bevel gear sleeved on the second rotating shaft, a connecting rod, and a slider. The axis of the first bevel gear and the axis of the second bevel gear are perpendicular to each other, and the second bevel gear is meshed with the first bevel gear; the upper end of the second rotating shaft is fixedly installed on the left column through a bearing seat with a bearing, And the upper end of the second rotating shaft is covered with two bearing seats; the lower end of the second rotating shaft is fixedly equipped with a crank wheel; the crank wheel is eccentrically hinged with one end of the connecting rod; the other end of the connecting rod is hinged On the slide block, the slide block is fixedly connected with the above-mentioned blackboard eraser roller.

Furthermore, the described eraser roller fixing mechanism includes a linear bearing mount, an adjustment rod and an adjustment screw, and both ends of the eraser roller are sleeved with linear bearings; the linear bearing is installed on the linear bearing mount. In the first mounting hole; the linear bearing mount is provided with a second mounting hole, the axis of the second mounting hole is perpendicular to the axis of the first mounting hole; the rear side of the right column and the left column The rear sides are fixedly connected with fixed blocks; the adjusting rod passes through the second mounting hole and the fixed block and is connected with the adjusting screw.

Furthermore, it also includes a power supply box, a pull-off switch for controlling the motor switch and a power switch for controlling the power supply box, the power switch is connected with the power supply box; the power supply box and the pull-off switch; the The disconnect switch is connected to the motor.

Furthermore, the eraser of the eraser roller is in the shape of a quarter arc.

Furthermore, the lower cross beam and the upper cross beam are symmetrically provided with limit posts for preventing the screen from wandering left and right.

Further, the back side of the writing surface of the curtain is close to the front liner and the back liner which are fixedly installed on the front and rear frame surfaces of the frame; the above-mentioned power switch and disconnect switch are all installed on the front liner.

Furthermore, the back of the writing surface of the curtain is a frosted surface.

3. Beneficial effect

Compared with the existing known technology, the technical solution provided by the invention has the following remarkable effects:

(1) A rolling whiteboard of the present invention, which includes an upper rotating roller adjustment mechanism, a lower rotating roller driving mechanism, an eraser roller fixing mechanism and an eraser roller driving mechanism, has a simple structure, is convenient to assemble and disassemble, and has a compact overall structure;

(2) A kind of rolling whiteboard of the present invention, it comprises the upper rotating roller adjustment mechanism, the right side of the right column and the left side of the left column are fixedly connected with the fixed mounting seat, and the adjusting bolt is connected with the bearing seat after passing through the fixed mounting seat The mounting seat is fixedly connected, and the bearing seat is fixedly connected with a bearing seat with bearings. The bearing seats with bearings are respectively sleeved on the two ends of the above-mentioned upper rotating roller. The connection is compact and easy to disassemble. The seat mounting seat is adjusted up and down, driving the upper rotating roller installed on the bearing seat to move up and down, and then realize the purpose of adjusting the tightness of the curtain;

(3) A rolling whiteboard of the present invention, which includes a lower rotating roller driver, the output shaft of the motor is connected with one end of the first rotating shaft through a coupling, and the other end of the first rotating shaft passes through the right column and connects with the The driving wheel is connected, and the driving wheel and the driven wheel set on the right end of the lower rotating roller are connected through a synchronous belt. The connection is compact and easy to disassemble. The driven wheel, because the upper rotating roller and the lower rotating roller are connected by a closed loop curtain in the form of a conveyor belt, the curtain can be rolled circularly;

(4) A kind of rolling whiteboard of the present invention, it comprises eraser roller fixed mechanism, eraser roller and eraser roller driving mechanism, in the eraser roller driving mechanism, design is carried out according to the principle of crank slider mechanism, connection is compact, easy to disassemble, When the lower rotating roller rolls, it drives the first bevel gear to work, the second bevel gear meshes with the first bevel gear to drive the second rotating shaft to rotate, the second rotating shaft drives the crank wheel to rotate, and the crank wheel drives the connecting rod eccentrically hinged on the crank wheel Movement, the connecting rod drives the slider to move left and right, the slider is fixedly connected with the eraser roller installed on the frame through the eraser roller fixing mechanism, and then drives the eraser roller to move left and right to achieve the purpose of wiping writing, reducing labor intensity and improving Teaching environment;

(5) A rolling whiteboard of the present invention, which includes a fixing mechanism for an eraser roller, linear bearings are set on both ends of the eraser roller, the linear bearings are installed in the first mounting hole of the linear bearing mounting seat, and the linear bearing mounting seat There is a second installation hole on the top, the axis of the second installation hole is perpendicular to the axis of the first installation hole, the rear side of the right column and the rear side of the left column are fixedly connected with fixed blocks, and the adjustment rod passes through the second installation The hole and the fixing block are connected with the adjusting screw, which is compact and easy to disassemble and assemble. The adjusting screw is used to adjust the tightness of the adjusting rod, which drives the linear bearing mounting seat on which the linear bearing is installed to move up and down, and then drives the eraser roller to move up and down, which is convenient for adjusting the eraser and the tightness of the curtain;

(6) A kind of rolling whiteboard of the present invention, it comprises power supply, the disconnect switch that is used to control motor switch and the power switch that is used to control power switch, and power switch is connected with power box, and power box is connected with dial switch, The disconnect switch is connected with the motor to realize automatic control, and the disconnect switch and power switch can be controlled according to the needs, which is convenient to operate and simple to connect;

(7) a kind of rolling type whiteboard of the present invention, the blackboard eraser of its blackboard eraser roller is the circular arc shape of 1/4, has increased the contact area of blackboard eraser and curtain, makes wiping more clean;

(8) A rolling whiteboard of the present invention, the lower beam and the upper beam are symmetrically provided with limit posts for preventing the curtain from running off to the left and right, so as to limit the deviation of the curtain when rolling and ensure normal use;

(9) a kind of rolling type whiteboard of the present invention, the back side of its curtain writing surface is close to the front liner and the back liner fixedly installed on the front and rear frame surfaces of the frame, convenient for writing;

(10) A kind of rolling type whiteboard of the present invention, the back side of its curtain writing surface is frosted surface, increases frictional force, to prevent slipping on the upper rotating roller and the lower rotating roller.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of a kind of rolling whiteboard of the present invention;

Fig. 2 is a side view of a rolling whiteboard of the present invention;

Fig. 3 is a schematic structural view of the upper rotating roller adjustment mechanism in the present invention;

Fig. 4 is a schematic structural view of the driving mechanism of the middle and lower turning rollers of the present invention;

Fig. 5 is the structural representation of the blackboard eraser roller driving mechanism among the present invention;

Fig. 6 is the schematic diagram that crank wheel and slide block are connected in the blackboard eraser roller drive mechanism among the present invention;

Fig. 7 is a structural schematic diagram of the fixing mechanism of the eraser roller in the present invention.

Explanation of the labels in the schematic diagram: 1, frame; 2, upper rotating roller; 3, lower rotating roller; 4, eraser roller; 401, eraser; 5, curtain; 601, bearing seat; 602, bearing seat mounting seat; 603, fixed Mounting seat; 604, adjusting bolt; 701, motor; 702, shaft coupling; 703, driving wheel; 704, driven wheel; 705, first rotating shaft; 706, synchronous belt; 801, first bevel gear; 802, second Bevel gear; 803, second rotating shaft; 804, crank wheel; 805, connecting rod; 806, slider; 901, linear bearing; 902, linear bearing mounting seat; 903, fixed block; 904, adjusting rod; 905, adjusting screw ; 10, front liner; 11, rear liner; 12, limit column; 13, power switch; 14, dial switch; 15, power box.

detailed description

In order to further understand the content of the present invention, the present invention will be described in detail in conjunction with the accompanying drawings.

With reference to Fig. 1 and Fig. 2, a rolling whiteboard of the present invention can be hung on the wall or mounted on a frame during installation, and includes a rectangular frame 1, a curtain 5, an upper rotating roller adjustment mechanism, a lower The driving mechanism of the rotating roller, the fixing mechanism of the eraser roller and the driving mechanism of the eraser roller are simple in structure, easy to disassemble and assemble, and the overall structure is compact. The frame 1 includes the right column, the left column, the lower beam and the upper beam. 2. The two ends of the upper rotating roller 2 are respectively connected with the right column and the left column through the upper rotating roller adjustment mechanism; the lower rotating roller 3 is arranged on the frame 1, and the lower rotating roller 3 is located below the lower beam; the lower rotating roller 3 The right end passes through the bearing seat 601 with bearings and the right column successively and is connected with the lower rotating roller drive mechanism; the left end of the lower rotating roller 3 passes through the bearing seat 601 with bearings and the left column successively and is connected with the eraser roller driving mechanism; The above-mentioned bearing housing 601 is fixedly installed on the lower surface of the lower beam; the above-mentioned upper rotating roller 2 and the lower rotating roller 3 are parallel to each other, and the upper rotating roller 2 and the lower rotating roller 3 are connected by a closed loop curtain 5 in the form of a conveyor belt , the back side of the writing surface of the curtain 5 is a frosted surface to increase friction to prevent slipping on the upper rotating roller 2 and the lower rotating roller 3; in order to limit the deviation of the curtain 5 when rolling and ensure normal use, the lower beam and the upper beam The top is symmetrically provided with limit posts 12 for preventing the left and right deviation of the curtain 5; in addition, in order to facilitate writing on the curtain 5, the back of the writing surface of the curtain 5 is closely attached to the front lining plate fixedly installed on the front and rear frame surfaces of the frame 1 10 and rear liner 11; the bottom of the frame 1 is provided with an eraser roller 4 controlled by the eraser roller driving mechanism to move left and right; the eraser roller 4 is pressed and contacted with the above-mentioned curtain 5; the two ends of the eraser roller 4 are respectively It is connected with the right column and the left column; the power switch 13 for controlling the switch of the power supply box 15 and the dial switch 14 for controlling the switch of the motor 701 are installed on the front liner 10; the power switch 13 is connected with the power supply box 15; the power supply box 15 is connected with the disconnect switch 14; the disconnect switch 14 is connected with the motor 701; in the present embodiment, the power supply box 15 is installed on the frame 1 to realize automatic control, and the disconnect switch 14 and the power switch 13 can be controlled as required, which is easy to operate , the connection is simple; where:

As shown in Figure 3, the upper rotating roller adjustment mechanism includes a bearing seat mounting seat 602 and an adjusting bolt 604; the right side of the right column and the left side of the left column are fixedly connected with a fixed mounting seat 603; the adjusting bolt 604 passes through the fixed mounting seat After 603, it is fixedly connected with the bearing seat mounting seat 602; the bearing seat mounting seat 602 is fixedly connected with the bearing seat 601 with bearing, and the bearing seat 601 with bearing is respectively sleeved on the two ends of the above-mentioned upper rotating roller 2; the connection is compact , easy to disassemble, adjust the bearing seat mounting seat 602 up and down through the adjusting bolt 604, drive the bearing seat 601 installed on the bearing seat mounting seat 602 to move up and down, and then drive the upper rotating roller installed above the frame 1 through the bearing seat 601 2. Move up and down to achieve the purpose of adjusting the tightness of the curtain 5;

As shown in Figure 4, the driving mechanism of the lower rotating roller includes a motor 701 fixedly installed on the upper surface of the lower beam, a coupling 702, a driving wheel 703, a driven wheel 704 sleeved on the right end of the lower rotating roller 3, a first rotating shaft 705 and a synchronous belt 706, the output shaft of the motor 701 is connected to one end of the first rotating shaft 705 through the shaft coupling 702, and the other end of the first rotating shaft 705 is connected to the driving wheel 703 after passing through the right column; between the driving wheel 703 and the driven wheel 704 The connection between them is connected by a synchronous belt 706, which is compact and easy to disassemble; the motor 701 is controlled to work, and the motor 701 drives the driving wheel 703 connected to it to rotate, and the driving wheel 703 drives the driven wheel 704 to rotate through the synchronous belt 706, and the driven wheel 704 drives Turning roller 3 rotates, because the upper turning roller 2 and the lower turning roller 3 are connected in the form of a conveyor belt through a closed ring-shaped curtain 5, thereby realizing the circular rolling of the curtain 5;

As shown in Figures 5 and 6, the eraser roller drive mechanism includes a first bevel gear 801, a second rotating shaft 803, a second bevel gear 802, a connecting rod 805, a slider 806, and a first bevel gear sleeved on the left end of the lower rotating roller 3. The axis of the gear 801 is perpendicular to the axis of the second bevel gear 802 sleeved on the second rotating shaft 803, and the second bevel gear 802 meshes with the first bevel gear 801; the upper end of the second rotating shaft 803 passes through a bearing with a bearing The seat 601 is fixedly installed on the left column, and the upper end of the second rotating shaft 803 is covered with two bearing seats 601; the lower end of the second rotating shaft 803 is fixedly equipped with a crank wheel 804; the crank wheel 804 is eccentrically hinged with one end of the connecting rod 805; The other end of connecting rod 805 is hinged on slide block 806, and this slide block 806 is fixedly connected with above-mentioned blackboard eraser roller 4, and connection is compact, and dismounting is convenient; The lower rotating roller 3 drives the first bevel gear 801 connected with it to rotate, and because the second bevel gear 802 meshes with the first bevel gear 801, it drives the second bevel gear 802 to rotate, because the second bevel gear 802 is sleeved on the second bevel gear On the second rotating shaft 803, it drives the second rotating shaft 803 to rotate, and then drives the crank wheel 804 fixedly installed on the lower end of the second rotating shaft 803 to rotate, and then drives the eraser roller 4 to move left and right through the crank slider mechanism, so as to realize the purpose of wiping writing and reduce labor. Intensity improves the teaching environment. The specific structure of the above-mentioned crank slider mechanism is that the crank wheel 804 is eccentrically hinged with one end of the connecting rod 805; Roller 4 is fixedly connected;

As shown in Figure 7, the eraser roller fixing mechanism includes a linear bearing mount 902, an adjustment rod 904 and an adjustment screw 905, and both ends of the eraser roller 4 are provided with a linear bearing 901; the linear bearing 901 is installed on the linear bearing mount 902 In the first installation hole; the linear bearing mounting seat 902 is provided with a second installation hole, the axis of the second installation hole is perpendicular to the axis of the first installation hole; the rear side of the right column and the rear side of the left column are fixedly connected There is a fixing block 903; the adjusting rod 904 passes through the second mounting hole and the fixing block 903 and is connected with the adjusting screw 905; the connection is compact and easy to disassemble, and the adjusting screw 905 is used to adjust the tightness of the adjusting rod 904, and the linear bearing 901 is driven to be installed The linear bearing mounting seat 902 of the linear bearing moves up and down, and then drives the eraser roller 4 to move up and down, thereby realizing the adjustment of the degree of tightness between the eraser 401 and the curtain 5; in order to increase the contact area between the eraser 401 and the curtain 5 in the eraser roller 4, and make the wiping cleaner, The eraser 401 of the eraser roller 4 is a quarter of an arc.

When in use, first turn on the power switch 13, and use a paint pen to write on the curtain 5. When the switch 14 is turned to the "up" gear, the curtain 5 will rotate and rise, and the handwriting that has been written on the curtain 5 will rise. , students can see the written content on the curtain 5 at different angles, and the reverse side of the curtain 5 is lowering at the same time. The roller 3 can be erased; when the switch 14 is turned to the "down" gear, the curtain 5 will rotate and descend, and the handwriting that has been written on the curtain 5 will descend; in addition, the curtain 5 can also be used as a slide screen when it is still. use.

The advantages of using a rolling whiteboard of the present invention: 1. The teacher can always write on the blackboard in the most comfortable and convenient posture that is most suitable for himself, which greatly reduces the work intensity; 3. While the curtain 5 positioned at the back of the frame 1 is descending, the sponge on the eraser 401 in the eraser roller 4 will erase the handwriting, which can be written continuously for a long time without wiping the whiteboard by hand ; 4. Use a paint pen to write on the curtain 5 and wipe it with a sponge. There is no damage to the curtain 5, it can be used for a long time, and there is no dust and pollution when writing and erasing; 5. The curtain 5 can be used as a screen for slide teaching; 6. The slowly rising curtain 5 is just like movie subtitles, which is convenient for students to read and memorize.

The rolling whiteboard of the present invention has simple structure, convenient assembly and disassembly, and compact overall structure. The curtain 5 can rotate circularly and can be wiped automatically, which reduces labor intensity and improves the teaching environment.

The above schematically describes the present invention and its implementation, which is not restrictive, and what is shown in the drawings is only one of the implementations of the present invention, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired by it, without departing from the inventive concept of the present invention, without creatively designing a structural mode and embodiment similar to the technical solution, it shall all belong to the protection scope of the present invention .

Claims (9)

1. A rolling whiteboard, including a rectangular frame (1) and a curtain (5), the frame (1) includes a right column, a left column, a lower beam and an upper beam, and it is characterized in that it also includes an upper rotation roller adjustment mechanism, lower rotating roller driving mechanism, eraser roller fixing mechanism and eraser roller driving mechanism, the upper rotating roller (2) is arranged above the frame (1); the two ends of the upper rotating roller (2) The upper rotating roller adjustment mechanism is respectively connected with the right column and the left column; the frame (1) is provided with a lower rotating roller (3), and the lower rotating roller (3) is located under the lower beam; the lower rotating roller The right end of the roller (3) passes through the bearing housing (601) with bearings and the right column in sequence and then connects with the driving mechanism of the lower rotating roller; the left end of the lower rotating roller (3) passes through the bearing housing with bearings ( 601) and the left column are connected to the drive mechanism of the eraser roller, wherein the drive mechanism of the eraser roller includes the first bevel gear (801) sleeved on the left end of the lower rotating roller (3), the second rotating shaft (803), and the second shaft (803) sleeved on the second The second bevel gear (802), the connecting rod (805), and the slider (806) on the rotating shaft (803), the axis of the first bevel gear (801) and the axis of the second bevel gear (802) are perpendicular to each other , and the second bevel gear (802) meshes with the first bevel gear (801); the upper end of the second rotating shaft (803) is fixedly installed on the left column through the bearing seat (601) with bearings, and the second The upper end of the rotating shaft (803) is covered with two bearing seats (601); the lower end of the second rotating shaft (803) is fixedly equipped with a crank wheel (804); the crank wheel (804) and the connecting rod (805 ) is eccentrically hinged; the other end of the connecting rod (805) is hinged on the slider (806), and the slider (806) is fixedly connected to the eraser roller (4); the above-mentioned upper rotating roller (2) and the lower rotating roller (3) are parallel to each other, and the upper rotating roller (2) and the lower rotating roller (3) are connected by a closed loop curtain (5) in the form of a conveyor belt; the lower part of the frame (1) There is an eraser roller (4) controlled by the eraser roller drive mechanism to move left and right; the eraser roller (4) is in tight contact with the above-mentioned curtain (5); the two ends of the eraser roller (4) pass through the eraser roller The fixing mechanism is connected with the right column and the left column respectively. 2. A rolling whiteboard according to claim 1, characterized in that: the upper rotating roller adjustment mechanism includes a bearing seat mounting seat (602) and an adjusting bolt (604); the right side of the right column and the left side of the left column are fixedly connected with a fixed mounting seat (603); the described adjusting bolt (604) passes through the fixed mounting seat (603) and is fixedly connected with the bearing seat mounting seat (602); the described bearing seat A bearing seat (601) with a bearing is fixedly connected to the installation seat (602), and the bearing seat (601) with a bearing is sleeved on the two ends of the above-mentioned upper rotating roller (2) respectively. 3. A rolling whiteboard according to claim 2, characterized in that: the driving mechanism of the lower rotating roller includes a motor (701), a coupling (702), and a driving wheel ( 703), the driven wheel (704), the first rotating shaft (705) and the synchronous belt (706) sleeved on the right end of the lower rotating roller (3), the output shaft of the motor (701) is connected to the One end of the first rotating shaft (705) is connected, and the other end of the first rotating shaft (705) is connected with the driving wheel (703) after passing through the right column; the driving wheel (703) and the driven wheel (704) are connected are connected by a synchronous belt (706). 4. A rolling whiteboard according to claim 3, characterized in that: said eraser roller fixing mechanism includes a linear bearing mounting seat (902), an adjusting rod (904) and an adjusting screw (905), said Both ends of the eraser roller (4) are provided with linear bearings (901); the linear bearings (901) are installed in the first mounting holes of the linear bearing mounts (902); the linear bearing mounts ( 902) is provided with a second installation hole, the axis of the second installation hole is perpendicular to the axis of the first installation hole; the rear side of the right column and the rear side of the left column are fixedly connected with a fixing block (903) ; The adjusting rod (904) is connected with the adjusting screw (905) after passing through the second mounting hole and the fixing block (903). 5. A rolling whiteboard according to claim 4, characterized in that it also includes a power box (15), a pull switch (14) for controlling the switch of the motor (701) and a switch for controlling the power box (15) ), the power switch (13) is connected to the power box (15); the power box (15) is connected to the disconnect switch (14); the disconnect switch (14) Connect with motor (701). 6 . The rolling whiteboard according to claim 5 , characterized in that: the eraser ( 401 ) of the eraser roller ( 4 ) is in the shape of a quarter arc. 7. A rolling whiteboard according to claim 5 or 6, characterized in that: the lower beam and the upper beam are symmetrically provided with limit posts (12) for preventing the curtain (5) from running off to the left and right . 8. A rolling whiteboard according to claim 7, characterized in that: the back of the writing surface of the curtain (5) is in close contact with the front liner (10) fixedly installed on the front and rear frame surfaces of the frame (1). ) and back liner (11); above-mentioned power switch (13) and breaker switch (14) are all installed on the front liner (10). 9. A rolling whiteboard according to claim 8, characterized in that: the back of the writing surface of the curtain (5) is a frosted surface.