Adjustable lifting writing board

Abstract

The invention provides an adjustable lifting writing board, which relates to the technical field of learning tools. The writing board comprises a writing panel, a bottom horizontal frame symmetrically arranged below the writing panel, and a self-locking universal wheel symmetrically arranged on the bottom surface of the bottom horizontal frame. Vertical sleeves are fixedly installed on the upper surface of the bottom horizontal frame, and bottom connecting frames are fixedly connected between the bottom horizontal frames. A supporting plate is arranged below the writing panel, and further comprises: a sliding tube body is arranged inside the vertical sleeve, and a first outer tube and a first inner tube are arranged inside the sliding tube body; a folding telescopic tube is arranged below the first outer tube; a connecting horizontal tube is arranged between the two sliding tube bodies, and an adjusting block is arranged inside the connecting horizontal tube, and a plurality of channels are opened inside the adjusting block; a rotating receiving box is fixedly connected to the top of the sliding tube body, and an incomplete inner tooth ring and a tooth block are arranged inside the rotating receiving box; the height and angle of the writing board can be adjusted by a foot pedal arranged near the foot position of the user.

Description

Technical Field

[0001] The invention relates to the technical field of learning tools, in particular to an adjustable lifting writing board. Background Art

[0002] Writing board usually refers to a flat board that can be written and erased repeatedly for education and training. In the traditional sense, teaching writing board is not limited to black writing board, but covers a variety of writing tools and materials.

[0003] The application of writing boards is usually divided into a writing stage and a display stage. In the writing stage, the more comfortable area of ​​the writing board for the writer is usually the area near the middle of the writing board. The higher or lower areas require the writer to bend over or stretch his arms. Long-term writing will make the writer easily feel tired. The existing writing boards usually need to be fixed after adjusting the height or angle in order to maintain their height or angle. During the writing process, it is not easy for the writer to adjust the height of the writing board when holding the pen to write, so that the writer can maintain a more comfortable writing posture. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an adjustable lifting writing board, which can adjust the height of the writing panel by synchronously adjusting the relative positions of the first outer tube and the first inner tube arranged inside the two vertical sleeves, and switch the lifting, angle adjustment and locking of the device by a knob arranged near the user's hand position.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] An adjustable lifting writing board comprises a writing panel, a bottom horizontal frame symmetrically arranged below the writing panel, and a self-locking universal wheel symmetrically installed on the bottom surface of the bottom horizontal frame, wherein vertical sleeves are fixedly installed on the upper surface of the bottom horizontal frame, a bottom connecting frame is fixedly connected between the bottom horizontal frames, a supporting plate is arranged below the writing panel, and further comprises:

[0007] A sliding tube body is disposed inside the vertical sleeve, and a first outer tube and a first inner tube are disposed inside the sliding tube body. The first inner tube and the first outer tube are slidably connected and sealed, and the writing panel is lifted and lowered by synchronously extending and retracting the two groups of the first outer tube and the first inner tube;

[0008] A foldable telescopic tube is provided below the first outer tube, and the foldable telescopic tube changes the pressure of the liquid inside the first outer tube and the first inner tube by folding and telescoping, so that the liquid inside the first outer tube and the first inner tube circulates, so that the first outer tube and the first inner tube are telescoped;

[0009] A connecting transverse tube is arranged between the two sliding tube bodies, an adjusting block is arranged inside the connecting transverse tube, a plurality of channels are opened inside the adjusting block for the circulation of liquid, an adjusting block is symmetrically arranged inside the adjusting block, and a one-way valve is installed on the surface of the adjusting block for controlling the flow direction of the liquid;

[0010] The top of the sliding tube body is fixedly connected with a rotating receiving box, and an incomplete inner tooth ring and a tooth block are arranged inside the rotating receiving box for adjusting the tilt angle of the writing panel.

[0011] Furthermore, the vertical sleeve is fixedly connected to a fixing plate inside, a first outer tube is fixedly connected to a first circular groove opened on the surface of the fixing plate, a sealing plug is sealingly and slidably connected to the inside of the first outer tube, the bottom end of the first inner tube is fixedly connected to the upper surface of the sealing plug, a second inner tube is fixedly connected to the second circular groove opened on the upper surface of the first inner tube, the bottom end of the second inner tube is located in the through circular groove opened on the surface of the sealing plug, the second inner tube is fixedly connected to the sealing plug, a plurality of water guide holes are evenly opened on the surface of the first inner tube near the position of the sealing plug, a support damping block is fixedly connected to the surface of the first outer tube, the support damping block is slidably connected to the sliding tube body, a filling support block is fixedly connected to the inside of the sliding tube body, the first inner tube is fixedly connected to the seventh circular groove opened on the bottom surface of the filling support block, and a plurality of liquid grooves are opened inside the filling support block.

[0012] Furthermore, an adjusting block is fixedly connected to the interior of the connecting cross pipe, an adjusting cavity is symmetrically opened inside the adjusting block, the adjusting block is rotatably connected to the interior of the adjusting cavity, four first water guide grooves are symmetrically opened on the surface of the adjusting block, two of the first water guide grooves on the same side are connected to the corresponding interior of the adjusting cavity, the one-way valve is fixedly connected to a third circular groove opened on the surface of the adjusting block, one of the first water guide grooves on the same side is connected to the corresponding interior of the first inner tube through a pipe, and the other first water guide groove is connected to the corresponding interior of the second inner tube through a pipe.

[0013] Furthermore, a connecting piece is fixedly connected to the bottom surface of the fixing piece, a connecting bottom piece is arranged below the connecting piece, the folding telescopic tube is located between the connecting piece and the connecting bottom piece, the connecting piece and the connecting bottom piece are respectively fixedly connected to the two openings of the folding telescopic tube, a fourth circular groove connected to the folding telescopic tube and the interior of the fixing piece is arranged on the surface of the connecting piece, a plurality of spring rods are symmetrically arranged on the upper surface of the connecting bottom piece, and the two ends of the spring rods are respectively fixedly connected to the connecting piece and the connecting bottom piece.

[0014] Furthermore, the bottom connecting frame is symmetrically fixedly connected to the inside of the constraint blocks, and a rotating rod is rotatably connected in the constraint grooves opened on the surfaces of the two constraint blocks. A foot pedal is fixedly connected to the surface of the rotating rod, and the foot pedal is located in a movable groove opened on the surface of the bottom connecting frame. Extrusion blocks are respectively fixedly connected to the two ends of the rotating rod, and the extrusion blocks are both located inside the bottom cross frame.

[0015] Furthermore, an adjusting cavity is opened inside the adjusting block, and the adjusting cavity is connected with the inside of the adjusting cavity. Annular grooves are symmetrically opened inside the adjusting cavity, and the adjusting cavities are respectively located in the corresponding annular grooves. Sealing blocks are symmetrically arranged inside the adjusting cavity, and the sealing blocks are rotatably connected in the corresponding annular grooves through dynamic sealing rings and first bearings. The sealing blocks are respectively fixedly connected to the corresponding adjusting blocks, and a first gear is fixedly connected to the surface of the sealing block, and a second gear is meshedly connected between the two first gears. A connecting column is fixedly connected to the surface of the second gear, and the connecting column is rotatably connected to a fifth circular groove opened on the surface of the connecting cross tube through a second bearing.

[0016] Furthermore, a knob is fixedly connected to the end of the connecting column, a plurality of positioning tubes are fixedly connected to the surface of the connecting cross tube in a circular array, a third spring is provided inside the positioning tubes, a positioning bead is slidably connected inside the positioning tubes, both ends of the third spring are respectively fixedly connected to the third spring and the positioning bead, and a side of the knob close to the connecting cross tube is provided with positioning grooves corresponding to the positioning beads.

[0017] Furthermore, a limiting sleeve is fixedly connected to the surface of the connecting cross tube, a second spring is arranged inside the limiting sleeve, the limiting sleeve is slidably connected to a limiting slider inside, both ends of the second spring are respectively fixedly connected to the limiting sleeve and the limiting slider, and the end of the second spring is fixedly connected to a constraint top block.

[0018] Furthermore, the incomplete internal gear ring is rotatably connected to the interior of the rotating receiving box, an arc-shaped sliding groove is provided on the surface of the rotating receiving box, an arc-shaped slider is provided inside the arc-shaped sliding groove, the arc-shaped slider is fixedly connected to the incomplete internal gear ring, the arc-shaped slider is slidably connected to the rotating receiving box via the arc-shaped sliding groove, a second connecting tube is fixedly connected to the surface of the arc-shaped slider, the writing panel is rotatably connected to the two second connecting tubes via two second bearings, and the tooth block is meshingly connected to the incomplete internal gear ring.

[0019] Furthermore, a rectangular sleeve is fixedly connected to the bottom surface of the tooth block, a sealing sliding block is slidably connected to the interior of the rectangular sleeve, a first spring is arranged inside the rectangular sleeve, two ends of the first spring are respectively fixedly connected to the sealing sliding block and the rectangular sleeve, two second water guide grooves are provided on the surface of the adjusting block, the second water guide grooves are connected to the sealing sliding block located on the same side through a pipeline, and the sealing sliding block is fixedly connected to the eighth through groove provided inside the rotating receiving box.

[0020] The above solution of the present invention includes at least the following beneficial effects:

[0021] The above scheme of the present invention adjusts the height of the writing panel by synchronously adjusting the relative positions of the first outer tube and the first inner tube arranged inside the two vertical sleeves, and arranges the foot pedal for adjustment at a position close to the user's feet, which is convenient for the user to adjust while writing, and switches the lifting, angle adjustment and locking of the device through a knob arranged near the user's hand position, so that the user can adjust the device during the writing process to keep it in a more comfortable writing posture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure provided by the present invention.

[0023] Figure 2 It is a schematic diagram of connecting the transverse pipes in the present invention.

[0024] Figure 3 It is a schematic diagram of the rotating receiving box in the present invention.

[0025] Figure 4 It is a schematic diagram of a foot pedal in the present invention.

[0026] Figure 5 It is a schematic diagram of the tooth block in the present invention.

[0027] Figure 6 It is a schematic diagram of adjusting the block in the present invention.

[0028] Figure 7 It is a schematic diagram of the position of the first water channel in the present invention.

[0029] Figure 8 It is a schematic diagram of the sealing block in the present invention.

[0030] Fig. 9 The present invention Figure 2 Enlarged view of point A in the middle.

[0031] Fig.10 The present invention Figure 2 Enlarged view of point B in the middle.

[0032] Fig.11 The present invention Figure 3 Enlarged view of point C in the middle.

[0033] Fig.12 The present invention Figure 3 Enlarged view of point D in the middle.

[0034] Fig.13 The present invention Figure 4 Enlarged view of point E in the middle.

[0035] Fig.14 The present invention Figure 4 Enlarged view of point F in the middle.

[0036] Fig.15 The present invention Figure 4 Enlarged view of point G in the middle.

[0037] In the figure: 101, writing panel; 102, bottom horizontal frame; 103, self-locking universal wheel; 104, bottom connecting frame; 105, vertical sleeve; 106, support plate; 201, sliding tube body; 202, connecting horizontal tube; 203, rotating receiving box; 204, incomplete inner gear ring; 205, arc sliding groove; 206, arc sliding block; 207, second connecting tube; 208, tooth block; 209, rectangular sleeve; 210, sealing sliding block; 211, filling support block; 212, first inner tube; 213, first outer tube; 214, support damping block; 215, second inner tube; 216, sealing plug block; 217, fixing plate; 218, connecting plate; 219, folding telescopic tube; 22 0. Connecting film; 221. Spring rod; 222. Water guide hole; 223. First spring; 301. Adjusting block; 302. First water guide groove; 303. Adjusting cavity; 304. Second water guide groove; 305. Adjusting block; 306. One-way valve; 307. Sealing block; 308. Adjusting cavity; 309. First gear; 310. Second gear; 311. Connecting column; 401. Limiting sleeve; 402. Second spring; 403. Limiting slider; 404. Constraining top block; 405. Knob; 406. Positioning bead; 407. Positioning groove; 408. Positioning tube; 409. Third spring; 501. Constraining block; 502. Turn bar; 503. Foot pedal; 504. Extrusion block. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] like Figure 1 As shown, an embodiment of the present invention provides an adjustable lifting writing board, including a writing panel 101, a bottom cross frame 102 symmetrically arranged below the writing panel 101, and a self-locking universal wheel 103 symmetrically installed on the bottom surface of the bottom cross frame 102, a vertical sleeve 105 is fixedly installed on the upper surface of the bottom cross frame 102, a bottom connecting frame 104 is fixedly connected between the bottom cross frames 102, and a support plate 106 is arranged below the writing panel 101.

[0040] like Figures 1 to 15 As shown, the vertical sleeve 105 further includes: a sliding tube body 201 is disposed inside the vertical sleeve 105, a first outer tube 213 and a first inner tube 212 are disposed inside the sliding tube body 201, the first inner tube 212 and the first outer tube 213 are slidably connected and sealed, and the two groups of the first outer tube 213 and the first inner tube 212 are synchronously extended and retracted to make the writing panel 101 rise and fall;

[0041] A foldable telescopic tube 219 is provided below the first outer tube 213. The foldable telescopic tube 219 changes the pressure of the liquid inside the first outer tube 213 and the first inner tube 212 by folding and telescoping, so that the liquid inside the first outer tube 213 and the first inner tube 212 can flow, so that the first outer tube 213 and the first inner tube 212 can be telescoped.

[0042] A connecting transverse pipe 202 is provided between the two sliding tube bodies 201, and an adjusting block 301 is provided inside the connecting transverse pipe 202. A plurality of channels are provided inside the adjusting block 301 for the circulation of liquid. An adjusting block 305 is symmetrically provided inside the adjusting block 301, and a one-way valve 306 is installed on the surface of the adjusting block 305 for controlling the flow direction of the liquid.

[0043] The top of the sliding tube 201 is fixedly connected with a rotating receiving box 203 , and an incomplete inner tooth ring 204 and a tooth block 208 are arranged inside the rotating receiving box 203 for adjusting the tilt angle of the writing panel 101 .

[0044] In this embodiment, when the height of the writing panel 101 needs to be adjusted, the first inner tube 212 and the first outer tube 213 are filled with liquid. By changing the liquid pressure inside the two groups, the first inner tubes 212 inside the two groups of first outer tubes 213 slide synchronously, thereby changing the height of the writing panel 101. By rotating the adjustment block 305, the direction of the water outlet end of the one-way valve 306 is changed, thereby changing the flow direction of the liquid in the two first water guide grooves 302 located on the same side, thereby controlling the elongation or shortening of the first inner tube 212 and the first outer tube 213. By controlling the engagement and separation of the incomplete inner tooth ring 204 and the tooth block 208, the inclination angle of the writing panel 101 is controlled.

[0045] like Figure 4 , Fig.11 , Fig.13 , Fig.14 and Fig.15 As shown, the interior of the vertical sleeve 105 is fixedly connected with a fixing plate 217, the first outer tube 213 is fixedly connected in a first circular groove on the surface of the fixing plate 217, the interior of the first outer tube 213 is sealingly and slidably connected with a sealing plug 216, the bottom end of the first inner tube 212 is fixedly connected to the upper surface of the sealing plug 216, the second inner tube 215 is fixedly connected in a second circular groove on the upper surface of the first inner tube 212, the bottom end of the second inner tube 215 is located in the through circular groove on the surface of the sealing plug 216, and the second inner tube 215 is fixedly connected to the upper surface of the sealing plug 216. 215 is fixedly connected to the sealing plug block 216, a plurality of water guide holes 222 are evenly opened on the surface of the first inner tube 212 near the sealing plug block 216, a support damping block 214 is fixedly connected to the surface of the first outer tube 213, the support damping block 214 is slidably connected to the sliding tube body 201, a filling support block 211 is fixedly connected inside the sliding tube body 201, the first inner tube 212 is fixedly connected to the seventh circular groove opened on the bottom surface of the filling support block 211, and a plurality of liquid passing grooves are opened inside the filling support block 211.

[0046] In this embodiment, when liquid enters between the second inner tube 215 and the first inner tube 212 from the inside of the second inner tube 215 under the action of pressure, and enters between the first inner tube 212 and the first outer tube 213 through the water guide hole 222, the sealing plug block 216 causes the first inner tube 212 to move downward relative to the first outer tube 213 under the action of the larger liquid pressure above. When the liquid moves in the opposite direction, the first inner tube 212 moves upward relative to the first outer tube 213. During the movement of the first inner tube 212, the filling support block 211 fixedly connected to the first inner tube 212 and the sliding tube body 201 causes the sliding tube body 201 to move synchronously inside the vertical sleeve 105.

[0047] like Figure 3 , Figure 6 , Figure 7 , Figure 8 , Fig.13 and Fig.15 As shown, the interior of the connecting cross pipe 202 is fixedly connected with an adjusting block 301, and an adjusting cavity 303 is symmetrically opened inside the adjusting block 301. An adjusting block 305 is rotatably connected to the interior of the adjusting cavity 303. Four first water guide grooves 302 are symmetrically opened on the surface of the adjusting block 301. The two first water guide grooves 302 located on the same side are connected to the corresponding interior of the adjusting cavity 303. A one-way valve 306 is fixedly connected to the third circular groove opened on the surface of the adjusting block 305. One of the first water guide grooves 302 located on the same side is connected to the interior of the corresponding first inner tube 212 through a pipeline, and the other first water guide groove 302 is connected to the interior of the corresponding second inner tube 215 through a pipeline.

[0048] In this embodiment, the regulating block 305 in the regulating chamber 303 is rotated. When the regulating block 305 blocks the corresponding two first water guide grooves 302, the liquid in the second inner tube 215 and the liquid in the first inner tube 212 cannot flow with each other, and the deformation amount of the liquid under the pressure can be ignored. Therefore, the relative position of the first outer tube 213 and the first inner tube 212 is not easy to change, that is, the height of the writing panel 101 remains fixed. When the regulating block 305 is rotated to not block the corresponding two first water guide grooves 302, and the flow of the one-way valve 306 is The liquid flows from the first inner tube 212 and the second inner tube 215 through the pipeline to the water inlet end of the one-way valve 306, passes through the water outlet end of the one-way valve 306, and then enters the interior of the second inner tube 215 from the water outlet end through the pipeline. During this process, the liquid above the sealing plug 216 between the first outer tube 213 and the first inner tube 212 is reduced, so that the sealing plug 216 drives the second inner tube 215 to move upward. At this time, the adjusting block 305 is rotated 180°, and the liquid flows in the opposite direction, so that the sealing plug 216 drives the second inner tube 215 to move downward.

[0049] like Figure 4 and Fig.12 As shown, a connecting piece 218 is fixedly connected to the bottom surface of the fixing piece 217, a connecting bottom piece 220 is arranged below the connecting piece 218, a folding telescopic tube 219 is located between the connecting piece 218 and the connecting bottom piece 220, the connecting piece 218 and the connecting bottom piece 220 are respectively fixedly connected in two openings of the folding telescopic tube 219, a fourth circular groove connected with the folding telescopic tube 219 and the inside of the fixing piece 217 is opened on the surface of the connecting piece 218, and a plurality of spring rods 221 are symmetrically arranged on the upper surface of the connecting bottom piece 220, and the two ends of the spring rods 221 are respectively fixedly connected to the connecting piece 218 and the connecting bottom piece 220.

[0050] In this embodiment, the foldable telescopic tube 219 is folded and contracted by squeezing the connecting bottom sheet 220 upward, and the liquid stored in the foldable telescopic tube 219 is squeezed into the first outer tube 213 through the fourth circular groove on the surface of the connecting sheet 218. When the water outlet end of the one-way valve 306 is oriented so that the liquid in the second inner tube 215 flows between the first inner tube 212 and the first outer tube 213, the liquid squeezed from the foldable telescopic tube 219 into the first outer tube 213 enters the through circular groove at the bottom of the sealing plug 216. The liquid in the second inner tube 215 enters the regulating chamber 303 through the pipeline and is located on the side of the water inlet end of the one-way valve 306. After passing through the regulating chamber 303 and being located on the side of the water outlet end of the one-way valve 306, the liquid enters between the first inner tube 212 and the second inner tube 215 through the pipeline and enters between the first inner tube 212 and the first outer tube 213 through the water guide hole 222, increasing the amount of liquid between the first inner tube 212 and the first outer tube 213, so that the sealing plug 216 drives the first inner tube 212 to flow into the first outer tube 213. When the water outlet end of the one-way valve 306 is oriented so that the liquid flows from between the first inner tube 212 and the first outer tube 213 to the inside of the second inner tube 215, the sealing plug 216 drives the first inner tube 212 to move upward inside the first outer tube 213. When the extrusion and folding of the telescopic tube 219 is finished, the connecting bottom plate 220 moves in a direction away from the connecting plate 218 under the action of the elastic potential energy of the spring rod 221. In this process, when the water outlet end of the one-way valve 306 is oriented so that the liquid flows from between the first inner tube 212 and the first outer tube 213 to the inside of the second inner tube 215, the sealing plug 216 drives the first inner tube 212 to move upward inside the first outer tube 213. When the squeezing and folding of the telescopic tube 219 is finished, the connecting bottom plate 220 moves in a direction away from the connecting plate 218 under the action of the elastic potential energy of the spring rod 221. When the liquid in 215 flows between the first inner tube 212 and the first outer tube 213, the folding telescopic tube 219 is reset and absorbs water to cause the sealing plug 216 to continue to move downward inside the first outer tube 213 until the folding telescopic tube 219 is reset. When the direction of the water outlet end of the one-way valve 306 causes the liquid to flow from between the first inner tube 212 and the first outer tube 213 to the inside of the second inner tube 215, the folding telescopic tube 219 is reset and absorbs water to cause the sealing plug 216 to continue to move upward inside the first outer tube 213.

[0051] like Figure 4 As shown, the bottom connecting frame 104 is symmetrically fixedly connected with a constraint block 501 inside, and a rotating rod 502 is rotatably connected in a constraint groove opened on the surface of the two constraint blocks 501. A foot pedal 503 is fixedly connected to the surface of the rotating rod 502, and the foot pedal 503 is located in a movable groove opened on the surface of the bottom connecting frame 104. Extrusion blocks 504 are fixedly connected to both ends of the rotating rod 502, and the extrusion blocks 504 are all located inside the bottom cross frame 102.

[0052] In this embodiment, when compressing the folding telescopic tube 219, the pedal 503 can be stepped on to make the rotating rod 502 rotate a certain angle inside the constraint block 501, so that the extrusion block 504 will squeeze the connecting film 220 in the direction of compressing the folding telescopic tube 219 while following the rotation of the rotating rod 502. When the pedal 503 is stopped, the connecting film 220 will press the extrusion block 504 downward under the action of the elastic potential energy of the spring rod 221, so that the extrusion block 504 drives the rotating rod 502 to reset, that is, the pedal 503 is reset. Periodically stepping on the pedal 503 will cause the folding telescopic tube 219 to perform periodic telescopic movement, which is convenient for adjusting the height of the writing panel 101.

[0053] like Figure 6 , Figure 7 , Figure 8 and Fig.10 As shown, an adjusting cavity 308 is provided inside the adjusting block 301, and the adjusting cavity 308 is connected with the inside of the adjusting cavity 303. Annular grooves are symmetrically provided inside the adjusting cavity 308, and the adjusting cavities 303 are respectively located inside the corresponding annular grooves. Sealing blocks 307 are symmetrically provided inside the adjusting cavity 308, and the sealing blocks 307 are rotatably connected in the corresponding annular grooves through dynamic sealing rings and first bearings. The sealing blocks 307 are respectively fixedly connected to the corresponding adjusting blocks 305, and a first gear 309 is fixedly connected to the surface of the sealing block 307. A second gear 310 is meshedly connected between the two first gears 309. A connecting column 311 is fixedly connected to the surface of the second gear 310, and the connecting column 311 is rotatably connected to the fifth circular groove provided on the surface of the connecting cross pipe 202 through a second bearing.

[0054] A knob 405 is fixedly connected to the end of the connecting column 311, and a plurality of positioning tubes 408 are fixedly connected in a circular array on the surface of the connecting cross tube 202. A third spring 409 is provided inside the positioning tube 408, and a positioning bead 406 is slidably connected inside the positioning tube 408. Both ends of the third spring 409 are fixedly connected to the third spring 409 and the positioning bead 406 respectively. A side of the knob 405 close to the connecting cross tube 202 is provided with positioning grooves 407 corresponding in number to the positioning bead 406.

[0055] In this embodiment, by rotating the knob 405, the connecting column 311 drives the second gear 310 to rotate a certain angle, and through the transmission of the two first gears 309, the corresponding sealing block 307 drives the adjusting block 305 to rotate a certain angle, thereby adjusting the position relationship between the adjusting block 305 and the first water guide groove 302 and the direction of the water outlet end of the one-way valve 306, so as to facilitate the adjustment of the position relationship between the first inner tube 212 and the first outer tube 213, and then adjust the height of the writing panel 101. In the process of rotating the knob 405, through the elastic potential energy of the third spring 409, the positioning bead 406 in the positioning tube 408 generates resistance to the rotation of the knob 405 when it slides out of the positioning groove 407, so that the rotation of the knob 405 can be easily perceived by the operator, and then the direction of the one-way valve 306 can be reflected.

[0056] like Figure 2 and Fig. 9 As shown, the surface of the connecting cross tube 202 is fixedly connected to a limiting sleeve 401, a second spring 402 is arranged inside the limiting sleeve 401, the limiting sleeve 401 is internally slidably connected to a limiting slider 403, both ends of the second spring 402 are respectively fixedly connected to the limiting sleeve 401 and the limiting slider 403, and the end of the second spring 402 is fixedly connected to a constraint top block 404.

[0057] In this embodiment, the writing panel 101 is rotated to rotate the bottom edge of the writing panel 101 to the groove on the surface of the constraining top block 404. During this process, the bottom edge of the writing panel 101 will first slide along one of the inclined surfaces of the constraining top block 404 toward the groove, and the constraining top block 404 and the limiting slider 403 will be moved in the direction of compressing the second spring 402 until the bottom edge of the writing panel 101 is embedded in the groove of the constraining top block 404. At this time, the writing panel 101 remains fixed under the elastic potential energy of the second spring 402. When it is necessary to flip the writing panel 101, continue to rotate the writing panel 101 so that the writing panel 101 slides out of the groove along the groove surface of the constraining top block 404 to overcome the elastic potential energy of the second spring 402, and slides out along the other inclined surface of the constraining top block 404 until the top edge of the writing panel 101 is rotated into the groove.

[0058] like Figure 4 , Figure 5 , Figure 7 , Figure 8 and Fig.13As shown, the incomplete inner tooth ring 204 is rotatably connected to the inside of the rotating receiving box 203, the surface of the rotating receiving box 203 is provided with an arc-shaped sliding groove 205, the inside of the arc-shaped sliding groove 205 is provided with an arc-shaped slider 206, the arc-shaped slider 206 is fixedly connected to the incomplete inner tooth ring 204, the arc-shaped slider 206 is slidably connected to the rotating receiving box 203 through the arc-shaped sliding groove 205, the surface of the arc-shaped slider 206 is fixedly connected with a second connecting tube 207, the writing panel 101 is rotatably connected to the two second connecting tubes 207 through two second bearings, and the tooth block 208 is meshingly connected to the incomplete inner tooth ring 204.

[0059] The bottom surface of the tooth block 208 is fixedly connected with a rectangular sleeve 209, and the interior of the rectangular sleeve 209 is slidably connected with a sealing sliding block 210. A first spring 223 is arranged inside the rectangular sleeve 209, and the two ends of the first spring 223 are respectively fixedly connected to the sealing sliding block 210 and the rectangular sleeve 209. Two second water guide grooves 304 are provided on the surface of the adjustment block 301, and the second water guide grooves 304 are connected with the sealing sliding block 210 located on the same side through a pipeline. The sealing sliding block 210 is fixedly connected to the eighth through groove opened inside the rotating receiving box 203.

[0060] In the present embodiment, when the two adjusting blockages 305 rotate simultaneously to block the second water guide groove 304, the liquid inside the sealing sliding block 210 and the rectangular sleeve 209 cannot flow into the inside of the adjusting chamber 303, thereby making it difficult for the rectangular sleeve 209 and the sealing sliding block 210 to move relative to each other, that is, the tooth block 208 is always meshed and connected with the incomplete inner tooth ring 204. At this time, the second connecting tube 207 fixedly connected to the incomplete inner tooth ring 204 through the arc-shaped slider 206 cannot rotate around the central axis of the incomplete inner tooth ring 204, that is, the writing panel 101 cannot be turned over. When the adjusting blockage 305 no longer blocks the second water guide groove 304, an external force pushes the second connecting tube 207, so that the incomplete inner tooth ring 204 moves in a direction opposite to the inner tooth ring 204. The interior of the rotating receiving box 203 tends to rotate until the tooth surface of the tooth block 208 slides relative to the teeth of the incomplete inner tooth ring 204. This process causes the rectangular sleeve 209 and the sealing sliding block 210 to move relative to each other in the direction of compressing the first spring 223. The liquid inside the rectangular sleeve 209 and the sealing sliding block 210 will flow to the corresponding regulating chamber 303 through the pipeline. When the tooth block 208 re-engages with the teeth of the incomplete inner tooth ring 204, under the action of the elastic potential energy of the first spring 223, the rectangular sleeve 209 and the sealing sliding block 210 are reset, so that the liquid inside the corresponding regulating chamber 303 flows back to the interior of the rectangular sleeve 209 and the sealing sliding block 210 through the second water guide groove 304 and the pipeline.

[0061] Working principle: When in use, the user twists the knob 405 to rotate the regulating block 305 to a state where the first water channel 302 is no longer blocked, and adjusts the position of the writing panel 101 to a suitable position by stepping on the foot pedal 503. When the user has reached a comfortable writing height, the writing panel 101 can be raised or lowered to a certain height by stepping on the foot pedal 503, so that the writer can always maintain a comfortable writing area. After writing is completed, when displaying the content of the writing panel 101, the regulating block 305 can be rotated to a state where the second water channel 304 is no longer blocked. At this time, the second connecting pipe 207 is rotated around the rotating receiving box 203 to a suitable angle, and the bottom of the writing panel 101 is lowered. The edge is always located in the groove of the constraint top block 404, and the relative position of the writing panel 101 and the second connecting tube 207 is kept unchanged under the action of the elastic potential energy of the second spring 402. When the second connecting tube 207 is rotated, the writing panel 101 will rotate along with the rotation of the second connecting tube 207. When the position of the writing panel 101 is rotated to a suitable position, the second water guide groove 304 is blocked by twisting the knob 405 to keep the position of the writing panel 101 fixed. When the writing panel 101 needs to be displayed for a long time, the adjusting block 305 can be rotated to block the first water guide groove 302 and the adjusting block 305 at the same time, so that the fixed state of the writing panel 101 can be maintained for a long time.

[0062] It should be noted that the bottom cross frame 102, the bottom connecting frame 104, the vertical sleeve 105 and the connecting cross pipe 202 are all tubular in shape, which is convenient for the components to be placed inside them; the friction between the supporting damping block 214 and the sliding tube body 201 makes the sliding tube body 201 and the gravity it carries have little effect on the liquid pressure inside the first outer tube 213, and when the adjusting block 305 is not blocked with the first water guide groove 302, the second connecting pipe 207 and the vertical sleeve 105 can be kept relatively still, which is convenient for adjusting the height and angle of the writing panel 101; the change of the total amount of liquid inside the rectangular sleeve 209 and the sealing sliding block 210 can be balanced by making the sealing block 216 have a certain deformation ability without affecting its sealing performance. The angle between the second connecting pipe 207 and the vertical direction is less than or equal to 30°, so that the constraint top block 40 4. The limitation of the writing panel 101 is in a better state; the surface of the rotating rod 502 is provided with a convex ring, which clamps the two constraint blocks 501 inside to prevent the rotating rod 502 and the constraint block 501 from moving along the axial direction of the rotating rod 502; the device uses the pipeline in a way that the matching threaded groove is connected or the pipe mouth is fixedly connected in a preset groove. When it is necessary to pass through the surface of the component, it can be penetrated by opening a reserved groove. The liquid passing through the pipeline can be sealed by a sealant. The use of the pipeline is well known in the prior art and will not be described in detail here; when the pipeline passes through the reserved groove inside the filling support block 211, it is fixedly connected to the filling support block 211, so that the filling support block 211 plays a supporting role for the pipeline; the vertical sleeve 105 is connected to the inside of the bottom cross frame 102, which is convenient for the extrusion block 504 to be extruded with the connecting bottom plate 220; the sliding tube body 201 is slidably connected to the vertical sleeve 105, so that the writing panel 101 can be stably lifted and lowered.

[0063] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An adjustable lifting writing board, comprising a writing panel (101), a bottom cross frame (102) symmetrically arranged below the writing panel (101), and a self-locking universal wheel (103) symmetrically installed on the bottom surface of the bottom cross frame (102), the upper surface of the bottom cross frame (102) is fixedly installed with a vertical sleeve (105), the bottom cross frames (102) are fixedly connected with a bottom connecting frame (104), and a support plate (106) is arranged below the writing panel (101), characterized in that: Also includes: A sliding tube body (201) is arranged inside the vertical sleeve (105), and a first outer tube (213) and a first inner tube (212) are arranged inside the sliding tube body (201); the first inner tube (212) and the first outer tube (213) are slidably connected and sealed, and the writing panel (101) is lifted or lowered by synchronously extending and retracting the two sets of the first outer tube (213) and the first inner tube (212); A foldable telescopic tube (219) is provided below the first outer tube (213), and the foldable telescopic tube (219) changes the pressure of the liquid inside the first outer tube (213) and the first inner tube (212) by folding and telescoping, so that the liquid inside the first outer tube (213) and the first inner tube (212) circulates, thereby causing the first outer tube (213) and the first inner tube (212) to expand and contract; A connecting transverse tube (202) is arranged between the two sliding tube bodies (201); an adjusting block (301) is arranged inside the connecting transverse tube (202); a plurality of channels are provided inside the adjusting block (301) for the circulation of liquid; an adjusting block (305) is symmetrically arranged inside the adjusting block (301); a one-way valve (306) is installed on the surface of the adjusting block (305) for controlling the flow direction of the liquid; The top of the sliding tube (201) is fixedly connected to a rotating receiving box (203), and an incomplete internal tooth ring (204) and a tooth block (208) are provided inside the rotating receiving box (203) for adjusting the tilt angle of the writing panel (101); The incomplete inner gear ring (204) is rotatably connected to the inside of the rotating receiving box (203); an arc-shaped sliding groove (205) is provided on the surface of the rotating receiving box (203); an arc-shaped sliding block (206) is provided inside the arc-shaped sliding groove (205); the arc-shaped sliding block (206) is fixedly connected to the incomplete inner gear ring (204); the arc-shaped sliding block (206) is slidably connected to the rotating receiving box (203) via the arc-shaped sliding groove (205); a second connecting tube (207) is fixedly connected to the surface of the arc-shaped sliding block (206); the writing panel (101) is rotatably connected to the two second connecting tubes (207) via two second bearings; and the tooth block (208) is meshingly connected to the incomplete inner gear ring (204); A rectangular sleeve (209) is fixedly connected to the bottom surface of the tooth block (208), a sealing sliding block (210) is slidably connected inside the rectangular sleeve (209), a first spring (223) is arranged inside the rectangular sleeve (209), two ends of the first spring (223) are respectively fixedly connected to the sealing sliding block (210) and the rectangular sleeve (209), two second water guide grooves (304) are provided on the surface of the adjustment block (301), the second water guide grooves (304) are connected to the sealing sliding block (210) located on the same side through a pipeline, and the sealing sliding block (210) is fixedly connected to an eighth through groove provided inside the rotating receiving box (203).

2. The adjustable lifting writing board according to claim 1, characterized in that: The interior of the vertical sleeve (105) is fixedly connected to a fixing plate (217); a first outer tube (213) is fixedly connected to a first circular groove provided on the surface of the fixing plate (217); a sealing plug (216) is sealingly and slidably connected to the interior of the first outer tube (213); the bottom end of the first inner tube (212) is fixedly connected to the upper surface of the sealing plug (216); a second inner tube (215) is fixedly connected to a second circular groove provided on the upper surface of the first inner tube (212); the bottom end of the second inner tube (215) is located in a through circular groove provided on the surface of the sealing plug (216); the second inner tube (215) is The first inner tube (212) is fixedly connected to the sealing plug block (216); a plurality of water guide holes (222) are evenly formed on the surface of the first inner tube (212) near the sealing plug block (216); a support damping block (214) is fixedly connected to the surface of the first outer tube (213); the support damping block (214) is slidably connected to the sliding tube body (201); a filling support block (211) is fixedly connected inside the sliding tube body (201); the first inner tube (212) is fixedly connected to a seventh circular groove formed on the bottom surface of the filling support block (211); and a plurality of liquid passage grooves are formed inside the filling support block (211).

3. The adjustable lifting writing board according to claim 2 is characterized in that: The interior of the connecting transverse pipe (202) is fixedly connected with an adjusting block (301), the interior of the adjusting block (301) is symmetrically provided with an adjusting cavity (303), the adjusting block (305) is rotatably connected to the interior of the adjusting cavity (303), the surface of the adjusting block (301) is symmetrically provided with four first water guide grooves (302), two of the first water guide grooves (302) located on the same side are connected to the interior of the corresponding adjusting cavity (303), the one-way valve (306) is fixedly connected to a third circular groove provided on the surface of the adjusting block (305), one of the first water guide grooves (302) located on the same side is connected to the interior of the corresponding first inner tube (212) through a pipeline, and the other first water guide groove (302) is connected to the interior of the corresponding second inner tube (215) through a pipeline.

4. The adjustable lifting writing board according to claim 3 is characterized in that: A connecting piece (218) is fixedly connected to the bottom surface of the fixing piece (217); a connecting bottom piece (220) is arranged below the connecting piece (218); the folding telescopic tube (219) is located between the connecting piece (218) and the connecting bottom piece (220); the connecting piece (218) and the connecting bottom piece (220) are respectively fixedly connected to two openings of the folding telescopic tube (219); a fourth circular groove is provided on the surface of the connecting piece (218) and is connected to the inside of the folding telescopic tube (219) and the fixing piece (217); a plurality of spring rods (221) are symmetrically arranged on the upper surface of the connecting bottom piece (220); two ends of the spring rods (221) are respectively fixedly connected to the connecting piece (218) and the connecting bottom piece (220).

5. The adjustable lifting writing board according to claim 4 is characterized in that: The bottom connecting frame (104) is symmetrically and fixedly connected to the inside of the restraining blocks (501); restraining grooves provided on the surfaces of the two restraining blocks (501) are rotatably connected to rotating rods (502); the surfaces of the rotating rods (502) are fixedly connected to pedals (503); the pedals (503) are located in movable grooves provided on the surface of the bottom connecting frame (104); and extrusion blocks (504) are respectively fixedly connected to the two ends of the rotating rods (502); the extrusion blocks (504) are both located inside the bottom cross frame (102).

6. The adjustable lifting writing board according to claim 5, characterized in that: An adjusting cavity (308) is provided inside the adjusting block (301), the adjusting cavity (308) is communicated with the inside of the adjusting cavity (303), annular grooves are symmetrically provided inside the adjusting cavity (308), the adjusting cavities (303) are respectively located inside the corresponding annular grooves, sealing blocks (307) are symmetrically provided inside the adjusting cavity (308), the sealing blocks (307) are rotatably connected in the corresponding annular grooves via a dynamic sealing ring and a first bearing, the sealing blocks (307) are respectively fixedly connected to the corresponding adjusting blocks (305), a first gear (309) is fixedly connected to the surface of the sealing blocks (307), a second gear (310) is meshedly connected between the two first gears (309), a connecting column (311) is fixedly connected to the surface of the second gear (310), and the connecting column (311) is rotatably connected to a fifth circular groove provided on the surface of the connecting cross tube (202) via a second bearing.

7. The adjustable lifting writing board according to claim 6, characterized in that: The end of the connecting column (311) is fixedly connected to a knob (405); the surface of the connecting transverse tube (202) is fixedly connected to a plurality of positioning tubes (408) in a ring array; a third spring (409) is provided inside each of the positioning tubes (408); a positioning bead (406) is slidably connected inside the positioning tube (408); two ends of the third spring (409) are fixedly connected to the third spring (409) and the positioning bead (406) respectively; and a side of the knob (405) close to the connecting transverse tube (202) is provided with positioning grooves (407) corresponding in number to the positioning beads (406).

8. The adjustable lifting writing board according to claim 7, characterized in that: The surface of the connecting cross tube (202) is fixedly connected to a limiting sleeve (401), a second spring (402) is arranged inside the limiting sleeve (401), the limiting sleeve (401) is slidably connected inside to a limiting slider (403), the two ends of the second spring (402) are respectively fixedly connected to the limiting sleeve (401) and the limiting slider (403), and the end of the second spring (402) is fixedly connected to a constraint top block (404).

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