A writing board guide rail sliding device and a writing board thereof

Abstract

The application discloses a writing board guide rail sliding device and a writing board thereof, wherein a front guide rail wall, a rear guide rail wall and a long strip guide rail groove are arranged on a guide rail shell, an upper fixed pulley is fixed to the upper end of the long strip guide rail groove, and a lower fixed pulley is fixed to the lower end of the long strip guide rail groove; the front guide rail wall is connected with a front writing board connecting sliding strip through a front sliding device; the rear guide rail wall is connected with a rear writing board connecting sliding strip through a rear sliding device; a traction rope is collectively tightened and wound on the upper fixed pulley and the lower fixed pulley, one end of the traction rope is fixedly connected with the front writing board connecting sliding strip, the other end of the traction rope is fixedly connected with the rear writing board connecting sliding strip, and when one of the writing board connecting sliding strips slides up and down, the other writing board connecting sliding strip is synchronously pulled to slide up and down through the traction rope; the two writing board connecting sliding strips are conveniently slid and matched to be pulled and connected to be lifted and lowered, two writing boards can be installed on the same writing board frame, and the display of writing content on the writing board surface is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to a writing tool device, in particular to a writing board guide rail sliding device and a writing board thereof. BACKGROUND

[0002] 1. The existing movable writing whiteboard frame can only fix one writing whiteboard, and the writing content is limited. If you want to write more content, you need to erase the previously written content first. If the previously written content is important and you do not want to erase it temporarily, you can either not write again or add more whiteboards. 2. In order to write more content and reuse, multiple pages of writing paper are clamped on the top of the writing whiteboard to write by turning the pages. The writing paper can only be used once and can only be wasted and pollute the environment after writing. It is not environmentally friendly and is not convenient for effect demonstration of some content. SUMMARY

[0003] In order to solve the above technical problems, the present application provides a writing board guide rail sliding device with reasonable structure, which can install two writing boards through the setting of front and rear writing board connecting sliding bars, and the two writing boards can slide up and down to display the content, thereby increasing the front display of the writing board.

[0004] A writing board guide rail sliding device, comprising a guide rail shell, the guide rail shell is in a strip shape, the front and rear edges of the guide rail shell respectively extend and protrude front and rear guide rail walls, an open type opening long slot is formed between the front and rear guide rail walls, an upper fixed pulley is fixed at the upper end of the long slot, and a lower fixed pulley is fixed at the lower end of the long slot.

[0005] The front guide rail wall is connected with a front writing board connecting sliding bar through a front sliding device, and the front writing board connecting sliding bar slides up and down on the front guide rail wall through the front sliding device.

[0006] The rear guide rail wall is connected with a rear writing board connecting sliding bar through a rear sliding device, and the rear writing board connecting sliding bar slides up and down on the rear guide rail wall through the rear sliding device.

[0007] The upper fixed pulley and the lower fixed pulley are jointly tightened and wound with a traction rope, one end of the traction rope is fixedly connected with the front writing board connecting sliding bar, the other end of the traction rope is fixedly connected with the rear writing board connecting sliding bar, and when one of the writing board connecting sliding bars slides up and down, the other writing board connecting sliding bar is synchronously pulled to open and slide up and down through the traction rope.

[0008] The beneficial effect of the writing board guide rail sliding device is that the product mainly sets front and rear sliding devices on the same guide rail shell, and installs two front and rear arranged and up and down slidable writing board connecting sliding strips on the front guide rail wall and the rear guide rail wall, which automatically open and slide to change positions (that is, when one of the writing board connecting sliding strips slides, the other writing board connecting sliding strip is dragged to slide, facilitating the sliding cooperation and lifting of the two writing board connecting sliding strips), and the two writing board connecting sliding strips synchronously open and slide, so that two writing boards can be installed on the same writing board frame, and the writing content display of the writing board surface is increased. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a perspective view of the product as a whole of the present application;

[0010] Figure 2 It is a perspective view of the guide rail shell of the product of the present application;

[0011] Figure 3 , Figure 4 , Figure 5 It is a perspective view of the front writing board connecting sliding strip of the product of the present application;

[0012] Figure 6 , Figure 7 , Figure 8 It is a perspective view of the front writing board connecting sliding strip of the product of the present application;

[0013] Figure 9 It is a sectional view of the product as a whole of the present application;

[0014] Figure 10 It is a sectional view of the guide rail shell of the product of the present application;

[0015] Figure 11 It is a sectional view of the front writing board connecting sliding strip and the rear writing board connecting sliding strip of the product of the present application;

[0016] Figure 12 It is a sectional view of the front sliding device and the front guide rail wall of the product of the present application;

[0017] Figure 13 It is a sectional view of the front sliding device of the product of the present application;

[0018] Figure 14 It is a sectional view of the long strip plastic shell one of the product of the present application;

[0019] Figure 15 It is a sectional view of the rear sliding device and the rear guide rail wall of the product of the present application;

[0020] Figure 16 It is a sectional view of the rear sliding device of the product of the present application;

[0021] Figure 17 is a sectional view of the long plastic shell of the product of the present application;

[0022] Figure 18 is a schematic view of the connection of the guide rail shell, upper fixed pulley, lower fixed pulley and traction rope of the product of the present application;

[0023] Figure 19 is a front view of the front sliding device of the product of the present application;

[0024] Figure 20 is a left view of the front sliding device of the product of the present application;

[0025] Figure 21 is a right view of the front sliding device of the product of the present application;

[0026] Figure 22 is a front view of the rear sliding device of the product of the present application;

[0027] Figure 23 is a left view of the rear sliding device of the product of the present application;

[0028] Figure 24 is a right view of the rear sliding device of the product of the present application;

[0029] Figure 25 is a perspective view of the writing board of Example 1 and Example 2 of the product of the present application;

[0030] Figure 26 is a front view of the writing board of Example 1 and Example 2 of the product of the present application.

[0031] Writing board guide rail sliding device 1, guide rail shell 11, front guide rail wall 12, rear guide rail wall 13, long guide rail groove 14, upper fixed pulley 15, lower fixed pulley 16, front sliding device 121, front writing board connecting sliding strip 122, rear sliding device 131, rear writing board connecting sliding strip 132, traction rope 17, front sliding positioning device 12A, guide rail cavity one 1221, guide rail slot one 1222, vertical wall one A11, horizontal wall one A12, long plastic shell one 12A1, roller assembly one 12A2, L-shaped slot one 12A3, slot opening one 12A4, rear sliding positioning device 13A, guide rail cavity two 1321, guide Rail gap 2 1322, long plastic shell 2 13A1, roller assembly 2 13A2, L-shaped insertion gap 2 13A3, gap opening 2 13A4, front shrinkage step 123, rear shrinkage step 133; mounting groove 101, front mounting piece 122A, rear mounting piece 132A; vertical wall 2 A31, horizontal wall 2 A32, guide rail cavity 2 1321, guide rail gap 2 1322, roller mounting through hole 1 12A5, roller mounting through hole 2 13A5, elastic buffer component AA1, leg 2, writing board 1 3, writing board 2 4, left vertical rod 21, right vertical rod 22, bottom crossbeam 23, left ground bottom rod 211, right ground bottom rod 221. Detailed Implementation

[0032] A writing board guide rail sliding device 1 includes a guide rail shell 11, which is elongated and made of metal, preferably aluminum. A front guide rail wall 12 and a rear guide rail wall 13 extend from the front and rear edges of the guide rail shell 11, respectively. An open-ended elongated guide rail groove 14 is formed between the front and rear guide rail walls 12 and 13. An upper fixed pulley 15 is fixed to the upper end of the elongated guide rail groove 14, and a lower fixed pulley 16 is fixed to the lower end. The front and rear guide rail walls 12 and 13 are symmetrical and have the same structure.

[0033] The front guide rail wall 12 is connected to a front writing board connecting slide bar 122 via a front sliding device 121. The front writing board connecting slide bar 122 slides up / down on the front guide rail wall 12 via the front sliding device 121.

[0034] The rear guide rail wall 13 is connected to a rear writing board connecting slide bar 132 via a rear sliding device 131. The rear writing board connecting slide bar 132 slides up / down on the rear guide rail wall 13 via the rear sliding device 131.

[0035] A traction rope 17 is wound tightly around the upper fixed pulley 15 and the lower fixed pulley 16. One end of the traction rope 17 is fixedly connected to the front writing board connecting slide bar 122, and the other end is fixedly connected to the rear writing board connecting slide bar 132. When one writing board connecting slide bar slides up / down dynamically, it will synchronously pull the other writing board connecting slide bar to slide open and close dynamically via the traction rope 17. The above describes the basic structure of this product.

[0036] The working process is as follows:

[0037] When the front writing board connecting sliding bar 122 is pushed to slide downward, the front writing board connecting sliding bar 122 slides along the front guide rail wall 12 by the front sliding device 121, and in the sliding process, the traction rope 17 is also synchronously pulled, the traction rope 17 synchronously pulls the rear writing board connecting sliding bar 132, the rear writing board connecting sliding bar 132 slides along the rear guide rail wall 13 upward by the rear sliding device 131, and the two writing board connecting sliding bars belong to opposite sliding.

[0038] On the contrary, when the rear writing board connecting sliding bar 132 is pushed to slide downward, the rear writing board connecting sliding bar 132 slides along the rear guide rail wall 13 downward by the rear sliding device 131, and in the sliding process, the traction rope 17 is also synchronously pulled, the traction rope 17 synchronously pulls the front writing board connecting sliding bar 122, and the front writing board connecting sliding bar 122 slides along the front guide rail wall 12 upward by the front sliding device 121.

[0039] Further, at least one end of the front guide rail wall 12 and the rear guide rail wall 13 is provided with a limiting device 18, which is used to prevent the corresponding front writing board connecting sliding bar 122 and the rear writing board connecting sliding bar 132 from being pulled out to both ends.

[0040] The limiting device 18 can also be provided at both ends of the front guide rail wall 12 and the rear guide rail wall 13; the limiting device 18 can also be provided at one end of the front guide rail wall 12 and at the opposite end of the rear guide rail wall 13; the limiting device 18 can also be provided on the inner wall of the front writing board connecting sliding bar 122 and the rear writing board connecting sliding bar 132 and cooperate with the corresponding front guide rail wall 12 and the rear guide rail wall 13 to limit;

[0041] The limiting device 18 is a limiting convex particle extending from the inner wall of the front guide rail wall 12 and the rear guide rail wall 13, which limits the overtravel of the front sliding device 121 and / or the rear sliding device 131, that is, prevents the front writing board connecting sliding bar 122 and the rear writing board connecting sliding bar 132 from being pulled out to both ends.

[0042] Further: the front rail wall 12 is an L-shaped front rail wall 12; the front sliding device 121 includes a front sliding positioning device 12A, an L-shaped front rail wall 12, a rail cavity one 1221 arranged in the front writing board connecting sliding bar 122, a rail gap one 1222 arranged on the rail cavity one 1221, the rail cavity one 1221 and the rail gap one 1222 are arranged in the axial direction, the front writing board connecting sliding bar 122 is inserted into the L-shaped front rail wall 12 through the rail gap one 1222 and the rail cavity one 1221 for clamping connection, the L-shaped front rail wall 12 is clamped with the front sliding positioning device 12A, the front sliding positioning device 12A is wrapped in the rail cavity one 1221 and connected with the cavity wall; the front writing board connecting sliding bar 122 slides up and down along the L-shaped front rail wall 12 by using the front sliding positioning device 12A; the front sliding positioning device 12A provides sliding and positioning functions, the rail cavity one 1221 provides a fixed cavity for the front sliding positioning device 12A and prevents the front sliding positioning device 12A from moving, and the rail gap one 1222 provides space for the L-shaped front rail wall 12 to be inserted into the rail cavity one 1221 and to be slid up and down, and the front sliding positioning device 12A, the L-shaped front rail wall 12, the rail cavity one 1221 and the rail gap one 1222 cooperate to realize a structure with easy sliding and stable sliding.

[0043] Further: the L-shaped front rail wall 12 is composed of a vertical wall one A11 and a horizontal straight wall one A12, the horizontal straight wall one A12 extends into the long rail groove 14, and the vertical wall one A11 and the horizontal straight wall one A12 are integrally formed in an L shape.

[0044] Further: the front sliding positioning device 12A includes a long plastic shell one 12A1 and a roller assembly one 12A2, the roller assembly one is made of plastic, the long plastic shell one 12A1 has an L-shaped insertion gap one 12A3 arranged in the axial direction, the bottom of the L-shaped insertion gap one 12A3 is a gap opening one 12A4, the roller assembly one 12A2 is movably connected to the wall of the long plastic shell one 12A1, the gap opening one 12A4 is aligned with the rail gap one 1222, the long plastic shell one 12A1 is inserted into the corresponding L-shaped front rail wall 12 for clamping connection through the L-shaped insertion gap one 12A3 and the gap opening one 12A4, and the roller assembly one 12A2 is in contact with the L-shaped front rail wall 12 and the inner wall of the rail cavity one 1221 for sliding; the long plastic shell one 12A1 provides balanced positioning, the roller assembly one provides auxiliary rolling for sliding, and the L-shaped insertion gap one 12A3 and the gap opening one 12A4 provide reasonable matching connection structure and anti-disengagement structure with the L-shaped front rail wall 12;

[0045] Further: the rear guide rail wall 13 is an L-shaped rear guide rail wall 13; the rear sliding device 131 includes a rear sliding positioning device 13A, an L-shaped rear guide rail wall 13, a guide rail cavity two 1321 provided in the rear writing board connecting sliding bar 132, a guide rail gap two 1322 provided on the guide rail cavity two 1321, the guide rail cavity two 1321 and the guide rail gap two 1322 are axially provided, the rear writing board connecting sliding bar 132 is inserted into the L-shaped rear guide rail wall 13 through the guide rail gap two 1322 and the guide rail cavity two 1321 and is clamped, the L-shaped rear guide rail wall 13 is clamped with the rear sliding positioning device 13A, the rear sliding positioning device 13A is wrapped in the guide rail cavity two 1321 and is connected with the cavity inner wall thereof; the rear writing board connecting sliding bar 132 slides up and down along the L-shaped rear guide rail wall 12 by using the rear sliding positioning device 13A; the rear sliding positioning device provides sliding and positioning functions, the guide rail cavity two provides a fixed cavity for the rear sliding positioning device and prevents wide movement, and the guide rail gap two is used to provide space for the L-shaped rear guide rail wall to be inserted into the guide rail cavity two and to be slid up and down; the rear sliding positioning device, the L-shaped rear guide rail wall, the guide rail cavity two, and the guide rail gap two cooperate to realize a structure of easy sliding and stable sliding.

[0046] Further: the L-shaped rear guide rail wall 13 is composed of a vertical wall two A31 and a horizontal straight wall two A32, the horizontal straight wall two A32 extends into the long strip guide rail groove 14, and the vertical wall two A31 and the horizontal straight wall two A32 are integrally formed to have an L shape.

[0047] Further: the rear sliding positioning device 13A includes a long strip plastic shell two 13A1 and a roller assembly two 13A2, the long strip plastic shell two 13A1 has an axially provided L-shaped insertion gap two 13A3 in a cross section, a gap opening two 13A4 at a bottom of the L-shaped insertion gap two 13A3, the roller assembly two 13A2 is movably connected to a wall of the long strip plastic shell two 13A1 in an inlaying manner, the gap opening two 13A4 is aligned with the guide rail gap two 1322, the long strip plastic shell two 13A1 is inserted into the corresponding L-shaped rear guide rail wall 13 through the L-shaped insertion gap two 13A3 and the gap opening two 13A4 for clamping connection, and the roller assembly two 13A2 is in contact with the L-shaped rear guide rail wall 13 and the inner wall of the guide rail cavity two 1321 respectively to provide sliding; the long strip plastic shell two provides balanced positioning, the roller assembly two provides auxiliary rolling for sliding, and the L-shaped insertion gap two and the gap opening two provide a reasonable matching connection structure and an anti-disengagement structure with the L-shaped rear guide rail wall;

[0048] Further: the front sliding positioning device 12A and the rear sliding positioning device 13A have the same structure; the guide rail cavity one 1221 and the guide rail cavity two 1321 have the same structure; the long strip plastic shell one 12A1 and the long strip plastic shell two 13A1 have the same structure; and the roller assembly one 12A2 and the roller assembly two 13A2 have the same structure.

[0049] The inner cavity of the guide rail cavity one 1221 and the guide rail cavity two 1321 is a long strip rectangle; the long strip plastic shell one 12A1 and the long strip plastic shell two 13A1 are rectangular long strips; the rectangular long strips of the long strip plastic shell one 12A1 and the long strip plastic shell two 13A1 are arranged in the corresponding long strip rectangular guide rail cavity one 1221 and the long strip rectangular guide rail cavity two 1321 for matching installation.

[0050] The upper and lower ends of the three-wall body of the long strip plastic shell one 12A1 are movably connected with the roller assembly one 12A2 in an inlaid manner, thereby providing stable and easy sliding.

[0051] The upper and lower ends of the three-wall body of the long strip plastic shell two 13A1 are movably connected with the roller assembly two 13A2 in an inlaid manner, thereby providing stable and easy sliding.

[0052] Further, the upper and lower ends of the three-wall body of the long strip plastic shell one 12A1 are provided with roller mounting through holes one 12A5, and a plurality of roller mounting through holes one 12A5 are provided, and a roller is mounted on each roller mounting through hole one 12A5, thereby forming the roller assembly one 12A2; each roller one protrudes from the inner and outer surfaces of the corresponding roller mounting through hole one, so that part of the roller surface of the roller one contacts the L-shaped front guide rail wall 12, and the other part of the roller surface contacts the guide rail cavity one 1221, thereby providing roller sliding.

[0053] Further, the upper and lower ends of the three-wall body of the long strip plastic shell two 13A1 are provided with roller mounting through holes two 13A5, and a plurality of roller mounting through holes two 13A5 are provided, and a roller is mounted on each roller mounting through hole two 13A5, thereby forming the roller assembly two 13A2; each roller two protrudes from the inner and outer surfaces of the corresponding roller mounting through hole two, so that part of the roller surface of the roller two contacts the L-shaped rear guide rail wall 13, and the other part of the roller surface contacts the guide rail cavity two 1321, thereby providing roller sliding.

[0054] Further, the holes of the roller mounting through hole one 12A5 and the roller mounting through hole two 13A5 protrude from the inner wall surface to limit micro protrusions, which are used to prevent the rollers from falling out during assembly.

[0055] Further, the upper and lower ends of the long strip plastic shell one 12A1 and the long strip plastic shell two 13A1 extend Z-shaped bending elastic buffer components AA1, which are in contact with the limiting device 18 for buffer damping transition, thereby preventing the writing board connection sliding bar from hard contact after sliding to a point.

[0056] Further, the front rail wall 12 is provided with a front stepped-down section 123 between the outer wall of the corresponding rail shell 11, and the outer wall of the front writing board connecting sliding bar 122 is arranged at the front stepped-down section 123; the rear rail wall 13 is provided with a rear stepped-down section 133 between the outer wall of the corresponding rail shell 11, and the outer wall of the rear writing board connecting sliding bar 132 is arranged at the rear stepped-down section 133.

[0057] Further, the rail shell 11 is provided with a mounting groove 101; the top of the front writing board connecting sliding bar 122 is provided with a front mounting piece 122A; and the top of the rear writing board connecting sliding bar 132 is provided with a rear mounting piece 132A.

[0058] Further, the mounting groove 101 is used for fixed connection with the foot support; and the front mounting piece 122A and the rear mounting piece 132A are used for fixed connection with the writing board.

[0059] Further, the rail shell 11, the front rail wall 12 and the rear rail wall 13 are integrally formed by aluminum stretching.

[0060] Further, the front writing board connecting sliding bar 122 and the rear writing board connecting sliding bar 132 are integrally formed by aluminum stretching.

[0061] Application Example 1

[0062] A writing board comprises the writing board rail sliding device 1, the foot support 2 and two writing boards, and the two writing boards are respectively a writing board one 3 and a writing board two 4; the writing board rail sliding device 1 is totally two, and the two writing board rail sliding devices 1 are arranged and fixed on the left and right sides of the foot support 2 in a left-right symmetrical manner.

[0063] The left and right ends of the writing board one 3 and the writing board two 4 are fixed in front of and behind the left and right symmetrical writing board rail sliding devices 1;

[0064] When the writing board one 3 is pushed to slide upward and rise, the writing board two 4 is synchronously and oppositely opened to slide downward, and vice versa; the upward and downward sliding is realized on the same rail shell.

[0065] When packed, the two writing boards are arranged in parallel, so that the packing volume can be compressed and the transportation is facilitated.

[0066] Application Example 2

[0067] A writing board comprises the writing board rail sliding device 1, the foot support 2 and two writing boards, and the two writing boards are respectively a writing board one 3 and a writing board two 4; the writing board rail sliding device 1 is totally two, and the two writing board rail sliding devices 1 are arranged and fixed on the left and right sides of the foot support 2 in a left-right symmetrical manner.

[0068] The writing board guide rail sliding device 1 comprises a guide rail shell 11, which is long strip-shaped, is made of metal, preferably aluminum; the front and rear edges of the guide rail shell 11 respectively extend and protrude with a front guide rail wall 12 and a rear guide rail wall 13, between which an open long strip-shaped guide rail groove 14 is formed, the upper end of the long strip-shaped guide rail groove 14 is fixed with an upper fixed pulley 15, and the lower end is fixed with a lower fixed pulley 16; the front guide rail wall 12 and the rear guide rail wall 13 are symmetrical and have the same structure;

[0069] The front guide rail wall 12 is connected with a front writing board connecting sliding bar 122 through a front sliding device 121, and the front writing board connecting sliding bar 122 slides up and down on the front guide rail wall 12 through the front sliding device 121;

[0070] The rear guide rail wall 13 is connected with a rear writing board connecting sliding bar 132 through a rear sliding device 131, and the rear writing board connecting sliding bar 132 slides up and down on the rear guide rail wall 13 through the rear sliding device 131;

[0071] The upper fixed pulley 15 and the lower fixed pulley 16 are collectively tightened and wound with a traction rope 17, one end of the traction rope 17 is fixedly connected with the front writing board connecting sliding bar 122, and the other end is fixedly connected with the rear writing board connecting sliding bar 132, when one of the writing board connecting sliding bars slides up and down, the other writing board connecting sliding bar will be synchronously pulled to slide apart by the traction rope 17.

[0072] The foot stand 2 comprises a left vertical rod 21, a right vertical rod 22, a bottom cross beam 23, a left floor bottom rod 211, and a right floor bottom rod 221, the two guide rail shells 11 on the left and right sides are fixedly connected to the left vertical rod 21 and the right vertical rod 22 in a left-right symmetrical manner (i.e., the left guide rail shell 11 is fixedly connected to the left vertical rod 21 on the left side; the right guide rail shell 11 is fixedly connected to the right vertical rod 22 on the right side), the middle and lower segments of the left vertical rod 21 and the right vertical rod 22 are fixedly connected with the bottom cross beam 23, the bottom end of the left vertical rod 21 is fixedly connected with the left floor bottom rod 211, and the bottom end of the right vertical rod 22 is fixedly connected with the right floor bottom rod 221;

[0073] The left and right ends of the writing board one 3 are fixedly connected between the left-right symmetrical front writing board connecting sliding bars 122 correspondingly;

[0074] The left and right ends of the writing board two 4 are fixedly connected between the left-right symmetrical rear writing board connecting sliding bars 132 correspondingly.

[0075] Working process:

[0076] When the writing board one 3 is pushed to slide up and rise, the left and right front writing board connecting sliding bars 122 are synchronously raised, the front sliding device 121 slides up, the left and right front writing board connecting sliding bars 122 pull the left and right rear writing board connecting sliding bars 132 down and apart synchronously through the traction ropes 17 and the rear sliding device 131, and the writing board two 4 slides down synchronously.

[0077] On the contrary, when the writing board two 4 is pushed to slide up and rise, the left and right rear writing board connecting sliding bars 132 are synchronously raised, the rear sliding device 131 slides up, the left and right rear writing board connecting sliding bars 132 pull the left and right front writing board connecting sliding bars 122 down and apart synchronously through the traction ropes 17 and the front sliding device 121, and the writing board one 3 slides down synchronously.

[0078] Preferred technical scheme: The bottom of the left floor bottom rod 211 and the right floor bottom rod 221 is respectively provided with a movable caster, which facilitates the movement of the position.

[0079] Preferred technical scheme: The writing board one 3 and the writing board two 4 can be written on both sides.

Claims

1. A chalkboard guide rail sliding device comprising a guide rail housing in the shape of a long strip, characterized in that: The front and rear edges of the guide rail shell respectively extend protruding front and rear guide rail walls, and a long guide rail slot with an open type opening is formed between the front and rear guide rail walls, the upper end of the long guide rail slot is fixed with an upper fixed pulley, and the lower end is fixed with a lower fixed pulley; The front guide rail wall is connected with a front writing board connecting sliding bar through a front sliding device, and the front writing board connecting sliding bar slides up and down on the front guide rail wall through the front sliding device; The rear guide rail wall is connected with a rear writing board connecting sliding bar through a rear sliding device, and the rear writing board connecting sliding bar slides up and down on the rear guide rail wall through the rear sliding device; The upper fixed pulley and the lower fixed pulley are jointly tightened and wound with a traction rope, one end of the traction rope is fixedly connected with the front writing board connecting sliding bar, and the other end is fixedly connected with the rear writing board connecting sliding bar, when one writing board connecting sliding bar slides up and down, the other writing board connecting sliding bar is synchronously pulled to slide up and down through the traction rope; At least one end of the front guide rail wall and the rear guide rail wall is provided with a limiting device, and the limiting device is used for preventing the corresponding front writing board connecting sliding bar and rear writing board connecting sliding bar from being pulled out to both ends; The front guide rail wall is an L-shaped front guide rail wall; the front sliding device includes a front sliding positioning device, an L-shaped front guide rail wall, a guide rail cavity one arranged in the front writing board connecting sliding bar, a guide rail slot one arranged on the guide rail cavity one, and the guide rail cavity one and the guide rail slot one are axially arranged; the front writing board connecting sliding bar is inserted into the L-shaped front guide rail wall through the guide rail slot one and the guide rail cavity one; the front sliding positioning device is clamped on the L-shaped front guide rail wall and is wrapped in the guide rail cavity one and connected with the inner wall of the guide rail cavity one; the front writing board connecting sliding bar slides up and down through the front sliding positioning device.

2. A writing board guide rail sliding device according to claim 1, characterized in that: The L-shaped front guide rail wall is composed of a vertical wall one and a horizontal wall one, the horizontal wall one extends into the long guide rail slot, and the vertical wall one and the horizontal wall one form an L shape.

3. A writing board guide rail sliding device according to claim 1, characterized in that: The front sliding positioning device includes a long plastic shell one and a roller assembly one, the long plastic shell one is provided with an axially arranged L-shaped insertion slot one, the bottom of the L-shaped insertion slot one is a gap opening one, the roller assembly one is movably connected to the wall of the long plastic shell one, the gap opening one is aligned with the guide rail slot one, the long plastic shell one is clamped and connected to the corresponding L-shaped front guide rail wall through the L-shaped insertion slot one and the gap opening one, and the roller assembly one is in contact with the L-shaped front guide rail wall and the inner wall of the guide rail cavity one to provide sliding.

4. A writing board guide rail sliding device according to claim 1, characterized in that: The rear guide rail wall is an L-shaped rear guide rail wall; the rear sliding device includes a rear sliding positioning device, an L-shaped rear guide rail wall, a guide rail cavity two arranged in the rear writing board connecting sliding bar, a guide rail slot two arranged on the guide rail cavity two, and the guide rail cavity two and the guide rail slot two are axially arranged; the rear writing board connecting sliding bar is inserted into the L-shaped rear guide rail wall through the guide rail slot two and the guide rail cavity two; the rear sliding positioning device is clamped on the L-shaped rear guide rail wall and is wrapped in the guide rail cavity two and connected with the inner wall of the guide rail cavity two; the rear writing board connecting sliding bar slides up and down through the rear sliding positioning device.

5. A writing tablet guide rail sliding device according to claim 4, characterized in that: The L-shaped rear guide rail wall is composed of a vertical wall two and a horizontal wall two, the horizontal wall two extends into the long guide rail slot, and the vertical wall two and the horizontal wall two form an L shape.

6. A writing tablet guide rail sliding device according to claim 4, characterized in that: The rear sliding positioning device comprises a long plastic shell two and a roller assembly two, the long plastic shell two is provided with an axially arranged L-shaped slot two, the bottom of the L-shaped slot two is a slot opening two, the roller assembly two is movably connected to the wall of the long plastic shell two, the slot opening two is aligned with the guide rail slot two, the long plastic shell two is inserted into the corresponding L-shaped rear guide rail wall through the L-shaped slot two and the slot opening two, and the roller assembly two is in contact with the L-shaped rear guide rail wall and the inner wall of the guide rail cavity two to provide sliding.

7. A writing board guide rail sliding device according to claim 1, characterized in that: The front guide rail wall and the corresponding guide rail shell outer wall are provided with a front stepped stage, and the outer wall of the front writing board connecting sliding strip is arranged at the front stepped stage; the rear guide rail wall and the corresponding guide rail shell outer wall are provided with a rear stepped stage, and the outer wall of the rear writing board connecting sliding strip is arranged at the rear stepped stage.

8. A writing board, characterized by: The writing board guide rail sliding device comprises a foot support, two writing boards, and a writing board guide rail sliding device, wherein the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support, the writing board guide rail sliding device is arranged on the foot support ​ ​ ​

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