阅读说明：本技术 一种具有夹持装置的绘图板 (Drawing board with clamping device ) 是由 石彩侠 于 2019-11-04 设计创作，主要内容包括：本发明公开了一种具有夹持装置的绘图板,包括绘图板,所述绘图板内设有开口朝右的伸缩腔,所述伸缩腔腔内滑动设有伸缩绘板,所述伸缩腔后侧设有操纵装置,所述操纵装置用以驱动所述伸缩绘板向右移动滑出所述伸缩腔,所述绘图板右侧抵接设有支撑板,本发明结构简单,操作方便,通过伸缩绘板的伸缩装置使得未使用状态时的绘图板占地面积小,便于携带,使用时,伸缩绘板与绘图板的拼合使得绘图区域变大,解决了分开独立夹紧中纸张的打皱与操作不便的问题,且通过挡板提高夹持装置的稳定性,其后收起绘图架时通过解锁装置使得装置恢复初始状态,其结构操作方便快捷,更符合人机学,便于携带使用。(The invention discloses a drawing board with a clamping device, which comprises a drawing board, wherein a telescopic cavity with a right opening is arranged in the drawing board, a telescopic drawing board is arranged in the telescopic cavity in a sliding manner, a control device is arranged at the rear side of the telescopic cavity and used for driving the telescopic drawing board to move rightwards and slide out of the telescopic cavity, and a support plate is arranged at the right side of the drawing board in a butting manner. Is more suitable for ergonomics and is convenient to carry and use.)

1. A drawing board with a clamping device comprises a drawing board, wherein a telescopic cavity with a rightward opening is arranged in the drawing board, a telescopic drawing board is arranged in the telescopic cavity in a sliding mode, a control device is arranged on the rear side of the telescopic cavity and used for driving the telescopic drawing board to move rightwards and slide out of the telescopic cavity, a supporting plate is arranged on the right side of the drawing board in an abutting mode, a T-shaped groove with a leftward opening is formed in the supporting plate, a T-shaped block with a right end extending into the T-shaped groove and connected with the T-shaped groove in a sliding mode is fixedly arranged at the right end of the telescopic drawing board, the control device drives the telescopic drawing board to move horizontally and drives the telescopic drawing board to slide forwards and backwards through the T-shaped block, a first clamping device used for clamping the right side of drawing paper is arranged in the telescopic drawing board, a first drawing area with a forward opening and a lower side communicated with the outside is arranged on the, the utility model discloses a drawing board, including flexible chamber, first clamping device, second clamping device, locking transmission device, flexible chamber front side, first clamping device downside in flexible chamber front side position is equipped with the opening forward and downside and the communicating second drawing region in the external world, second drawing region left side communicates with each other and is equipped with the opening forward the right storage paper groove that is used for placing the drawing paper, second clamping device right side be equipped with for with first clamping device power connection's locking transmission, locking transmission will the drawing board with flexible drawing board locking connection makes first drawing region with the second drawing region communicates with each other, will simultaneously second clamping device's rotation state conveys to first clamping device makes first clamping device with second clamping device synchronous working presss from both sides the drawing paper in the drawing region tightly.

2. A drawing board with clamping device according to claim 1, characterized in that: the operating device comprises an operating cavity, the right side of the operating cavity is communicated with a moving groove, the front side of the moving groove is communicated with the telescopic cavity, a first bevel gear is arranged in the operating cavity, the right end face of the first bevel gear is fixedly provided with a moving screw rod, the right end of the moving screw rod extends into the moving groove and is rotatably connected with the right end wall of the moving groove, the moving screw rod is in threaded connection with a moving block, the front end of the moving screw rod extends into the telescopic cavity, the front side of the telescopic cavity is communicated with a moving chute with a backward opening, a through groove penetrating forwards and backwards is arranged in the telescopic drawing plate, the front end of the moving block penetrates through the through groove and extends into the moving chute, the rear end face of the first bevel gear is in meshing connection with a second bevel gear, the second bevel gear is in splined shaft key connection with a spline block, the rear end face of the spline block is fixedly provided, and the front side of the second bevel gear in the control cavity is provided with a meshing spline housing for being in spline connection with the spline block, and the front end of the meshing spline housing is fixedly connected with the rotating device.

3. A drawing board with clamping device according to claim 2, characterized in that: linkage include with the communicating first belt groove in manipulation chamber, first belt inslot internal rotation be equipped with annular and lower extreme through annular connecting block with the first belt pulley that second bevel gear rear end face linked firmly, first belt pulley right side is rotated through first pivot and is equipped with the second belt pulley, the second belt pulley with through first belt power connection between the first belt pulley, first belt groove front side with the intercommunication is equipped with the thread groove between the flexible chamber, thread groove female connection has the periphery for screw thread and front end with the rotation spline housing of board butt is painted in the extension, rotation spline housing internal spline has the rotation integral key shaft, rotate integral key shaft rear end with link firmly through torsion spring between the first rotary shaft.

4. A drawing board with clamping device according to claim 2, characterized in that: the rotating device comprises a rotating cavity with the rear side communicated with the control cavity, a third bevel gear is rotatably arranged in the rotating cavity through a second rotating shaft, the rear end of the second rotating shaft is fixedly connected with the meshing spline housing, the left end surface of the third bevel gear is connected with a fourth bevel gear in a meshing manner, a third rotating shaft with the left end rotatably connected with the left end wall of the rotating cavity is fixedly arranged at the axis of the fourth bevel gear, a rotating groove is communicated with the right side of the rotating cavity, the right end of the third rotating shaft penetrates through the rotating groove and is fixedly connected with the second clamping device, a rotating wheel is fixedly arranged on the third rotating shaft in the rotating groove, the rotating groove is vertically and symmetrically communicated with grooves with each other, grooves with opposite openings are formed in the rotating groove, a clamping block positioned in the groove on the upper side is fixedly arranged on the upper end surface of the rotating wheel, a sliding groove is communicated with the space on the left side of the groove on the lower side, the stop block is vertically and symmetrically provided with first reset components, the left end face of the stop block is provided with a pulling rotating rod, the left end of the pulling rotating rod penetrates through the sliding groove and extends into the external space, the front end face of the pulling rotating rod is provided with a fixed block, and the lower side of the sliding groove is provided with an unlocking device.

5. A drawing board with clamping device according to claim 1, characterized in that: the first clamping device comprises a groove with a forward opening, the lower side of the groove is communicated with the first drawing area through a connecting groove, a clamping rotating wheel is rotationally arranged in the groove, the upper side of the groove is communicated with a placing groove with a forward opening, the upper end surface of the clamping rotating wheel is fixedly provided with a clamping block with the upper end extending into the placing groove and the front end surface of the clamping rotating wheel is fixedly provided with a clamping cushion for protecting paper, the second clamping device has the same structure as the first clamping device, the groove in the second clamping device is communicated with the second drawing area through the connecting groove, a transmission spline housing with the right end rotatably connected with the right end wall of the groove is fixedly arranged at the axis of the clamping rotating wheel in the first clamping device, a transmission groove is communicated between the left side of the groove and the telescopic cavity, and the left end of the transmission spline housing extends into the transmission groove, the left side of the groove in the second clamping device is communicated with the rotating groove, the right side of the groove in the second clamping device is provided with a belt device which is in power connection with the locking transmission device, the right end of the third rotating shaft penetrates through the groove and is fixedly connected with the belt device after being fixedly connected with the axis of the clamping rotating wheel, and the third rotating shaft is fixedly wound with a reset spring.

6. A drawing board with clamping device according to claim 5, characterized in that: the belt device comprises a left side and a first meshing cavity communicated with the grooves in the second clamping device, the right end of the third rotating shaft extends into the first meshing cavity and is fixedly provided with a fifth bevel gear, the lower end face of the fifth bevel gear is meshed with a sixth bevel gear connected through a fourth rotating shaft in a rotating mode, the right side of the first meshing cavity is communicated with a second meshing cavity through a second belt groove, a seventh bevel gear is arranged in the second meshing cavity through the rotation of the fifth rotating shaft, the fifth rotating shaft is connected with the fourth rotating shaft through second belt power, the right end face of the seventh bevel gear is meshed with an eighth bevel gear, and the right end face of the eighth bevel gear is fixedly provided with a sixth rotating shaft fixedly connected with the locking transmission device.

7. A drawing board with clamping device according to claim 1, characterized in that: the locking transmission device comprises a squeezing groove with a rightward opening, a locking block with the right end extending into the external space is arranged in the squeezing groove in a sliding mode, the front and the back of the locking block are symmetrically and fixedly provided with second reset components, the locking block is internally and rotatably provided with a connecting spline shaft, the left end of the connecting spline shaft extends into the extrusion groove and is used for being connected with the spline of the transmission spline housing, the left end of the connecting spline shaft is in spline connection with a connecting spline sleeve, the left side of the extrusion groove is communicated with the second meshing cavity, the sixth rotating shaft is fixedly connected with the left end of the connecting spline sleeve, the second reset component at the upper side is fixedly connected with an unlocking stay wire, the left side of the second reset component is communicated with a winding cavity through a wire slot, a winding wheel is rotatably arranged in the winding cavity through a connecting shaft, the left end of the unlocking stay wire penetrates through the wire groove and stretches into the winding cavity and is fixedly connected with the winding wheel, and the lower end of the connecting shaft is in power connection with the unlocking device.

8. A drawing board with clamping device according to claim 4, characterized in that: the unlocking device comprises an unlocking groove with an upward opening and communicated with the sliding groove, a pressing block is arranged in the unlocking groove in a sliding mode, a pressing spring with a lower end fixedly connected with the lower end wall of the unlocking groove is fixedly arranged on the lower end face of the pressing block, a guide slide block is fixedly arranged on the left end face of the pressing block, a meshing groove with a leftward opening is communicated with the right side of the unlocking groove, a meshing gear with a left end meshed with the pressing block is rotatably arranged in the meshing groove, a first conical transmission gear is fixedly arranged on the front end face of the meshing gear, a second conical transmission gear is rotatably connected with the front end face of the first transmission gear through a connecting shaft, a third belt groove is communicated with the lower side of the meshing groove, the lower end of the connecting shaft is rotatably connected with the lower end wall of the third belt groove and is fixedly provided with a third belt pulley, the rear side of the third belt groove is communicated with the winding cavity, the lower end of the connecting shaft is rotatably connected with the lower end wall of the third belt, and the fourth belt pulley is in power connection with the third belt pulley through a third belt.

Technical Field

The invention relates to the technical field of drawing tools, in particular to a drawing board with a clamping device.

Background

The drawing board is the backup pad that is used for supporting drawing paper and portable manipulation, indoor and go out to paint from life or building surveying drawing technical field's personnel work provides convenience for the fine arts, drawing board to among the prior art is fixed knot structure non-detachable basically, can't change its drawing region's size for can't satisfy the demand when needing most drawing region to support, and not be provided with the region of placing of drawing paper, bring inconvenience for the use.

Secondly, because of the fixed of its structure when the operation of going out, its area is portable not convenient for greatly, and the drawing board can be dismantled at present, and the concatenation of drawing board is complicated, and loading and unloading operation is inconvenient, need consume a large amount of time, and also waste time and energy when resumeing the drawing board initial condition.

Therefore, there is a need for further improvement of the prior art drawing boards, so as to improve the functionality and portability of the drawing boards.

Disclosure of Invention

It is an object of the present invention to provide a drawing board with a clamping device that overcomes the above-mentioned deficiencies of the prior art.

The drawing board with the clamping device comprises a drawing board, wherein a telescopic cavity with a right opening is arranged in the drawing board, a telescopic drawing board is arranged in the telescopic cavity in a sliding mode, a control device is arranged on the rear side of the telescopic cavity and used for driving the telescopic drawing board to move rightwards and slide out of the telescopic cavity, a support plate is arranged on the right side of the drawing board in an abutting mode, a T-shaped groove with a leftward opening is formed in the support plate, a T-shaped block with a right end extending into the T-shaped groove and connected with the T-shaped groove in a sliding mode is fixedly arranged at the right end of the telescopic drawing board, the control device drives the telescopic drawing board to move horizontally and drive the telescopic drawing board to slide forwards and backwards through the T-shaped block, a first clamping device used for clamping the right side of the drawing paper is arranged in the telescopic board, a first drawing area with a forward opening and a lower side communicated with the outside is arranged on the lower side of the, the utility model discloses a drawing board, including flexible chamber, first clamping device, second clamping device, locking transmission device, flexible chamber front side, first clamping device downside in flexible chamber front side position is equipped with the opening forward and downside and the communicating second drawing region in the external world, second drawing region left side communicates with each other and is equipped with the opening forward the right storage paper groove that is used for placing the drawing paper, second clamping device right side be equipped with for with first clamping device power connection's locking transmission, locking transmission will the drawing board with flexible drawing board locking connection makes first drawing region with the second drawing region communicates with each other, will simultaneously second clamping device's rotation state conveys to first clamping device makes first clamping device with second clamping device synchronous working presss from both sides the drawing paper in the drawing region tightly.

According to a further technical scheme, the operating device comprises an operating cavity, the right side of the operating cavity is communicated with a moving groove, the front side of the moving groove is communicated with the telescopic cavity, a first bevel gear is arranged in the operating cavity, the right end face of the first bevel gear is fixedly provided with a moving screw rod, the right end of the moving screw rod extends into the moving groove and is rotatably connected with the right end wall of the moving groove, a moving block, the front end of the moving screw rod extends into the telescopic cavity, the front side of the telescopic cavity is communicated with a moving chute, the opening of the moving chute faces backwards, a through groove which penetrates forwards and backwards is arranged in the telescopic drawing plate, the front end of the moving block penetrates through the through groove and extends into the moving chute, the rear end face of the first bevel gear is connected with a second bevel gear in a meshing manner, the second bevel gear is connected with a spline block in a splined manner, the rear end face of the spline block is fixedly provided, and the front side of the second bevel gear in the control cavity is provided with a meshing spline housing for being in spline connection with the spline block, and the front end of the meshing spline housing is fixedly connected with the rotating device.

A further technical scheme, the interlock include with the communicating first belt groove in manipulation chamber, first belt inslot internal rotation be equipped with annular and lower extreme through annular connecting block with the first belt pulley that second bevel gear rear end face linked firmly, first belt pulley right side is rotated through first pivot and is equipped with the second belt pulley, the second belt pulley with connect through first belt power between the first belt pulley, first belt groove front side with the intercommunication is equipped with the thread groove between the flexible chamber, thread groove female connection have the periphery for screw thread and front end with the rotation spline housing of board butt is painted in the extension, rotation spline housing internal spline has the rotation integral key shaft, rotate integral key shaft rear end with link firmly through torque spring between the first rotary shaft.

In a further technical scheme, the rotating device comprises a rotating cavity, the rear side of the rotating cavity is communicated with the control cavity, a third bevel gear is rotatably arranged in the rotating cavity through a second rotating shaft, the rear end of the second rotating shaft is fixedly connected with the meshing spline housing, the left end surface of the third bevel gear is connected with a fourth bevel gear in a meshing manner, a third rotating shaft, the left end of which is rotatably connected with the left end wall of the rotating cavity, is fixedly arranged at the axis of the fourth bevel gear, a rotating groove is communicated with the right side of the rotating cavity, the right end of the third rotating shaft penetrates through the rotating groove to be fixedly connected with the second clamping device, a rotating wheel is fixedly arranged on the third rotating shaft in the rotating groove, the rotating groove is vertically and symmetrically communicated with a groove with opposite openings, a clamping block positioned in the groove at the upper side is fixedly arranged on the upper end surface of the rotating wheel, and a sliding groove is, slide in the sliding tray and be equipped with the right-hand member and stretch into the downside dog in the recess, the dog symmetry has set firmly first subassembly that resets from top to bottom, the dog left end face sets firmly the left end and runs through the sliding tray stretches into external space's pulling bull stick, the terminal surface has set firmly the fixed block before the pulling bull stick, the sliding tray downside is equipped with unlocking device.

The technical scheme is that the first clamping device comprises a groove with a forward opening, the lower side of the groove is communicated with the first drawing area through a connecting groove, a clamping rotating wheel is rotationally arranged in the groove, the upper side of the groove is communicated with a placing groove with a forward opening, the upper end surface of the clamping rotating wheel is fixedly provided with a clamping block with the upper end extending into the placing groove and the front end surface of the clamping rotating wheel is fixedly provided with a clamping cushion for protecting paper, the second clamping device has the same structure as the first clamping device, the groove in the second clamping device is communicated with the second drawing area through the connecting groove, a transmission spline sleeve with the right end rotatably connected with the right end wall of the groove is fixedly arranged at the axis of the clamping rotating wheel in the first clamping device, a transmission groove is communicated between the left side of the groove and the telescopic cavity, and the left end of the transmission spline sleeve extends into the transmission groove, the left side of the groove in the second clamping device is communicated with the rotating groove, the right side of the groove in the second clamping device is provided with a belt device which is in power connection with the locking transmission device, the right end of the third rotating shaft penetrates through the groove and is fixedly connected with the belt device after being fixedly connected with the axis of the clamping rotating wheel, and the third rotating shaft is fixedly wound with a reset spring.

According to the technical scheme, the belt device comprises a left side and a first meshing cavity communicated with the grooves in the second clamping device, a fifth bevel gear is fixedly arranged in the first meshing cavity, the lower end face of the fifth bevel gear is in meshing connection with a sixth bevel gear in a rotating connection through a fourth rotating shaft, the right side of the first meshing cavity is communicated with the second meshing cavity through a second belt groove, a seventh bevel gear is rotatably arranged in the second meshing cavity through the fifth rotating shaft, the fifth rotating shaft is in power connection with the fourth rotating shaft through a second belt, the right end face of the seventh bevel gear is in meshing connection with an eighth bevel gear, and the right end face of the eighth bevel gear is fixedly provided with a sixth rotating shaft fixedly connected with the locking transmission device.

According to a further technical scheme, the locking transmission device comprises an extrusion groove with a rightward opening, a locking block with the right end extending into the external space is arranged in the extrusion groove in a sliding mode, second reset components are symmetrically and fixedly arranged in the front and back of the locking block, a connecting spline shaft with the left end extending into the extrusion groove and used for being in splined connection with the transmission spline housing is arranged in the locking block in a rotating mode, the left end of the connecting spline shaft is in splined connection with the connecting spline housing, the left side of the extrusion groove is communicated with a second meshing cavity, a sixth rotating shaft is fixedly connected with the left end of the connecting spline housing, an unlocking pull wire is fixedly connected to the second reset component on the upper side of the locking block, a winding cavity is arranged on the left side of the second reset component through the splined groove in a communicating mode, a winding wheel is rotatably arranged in the winding cavity through a connecting shaft, and the end of the, the lower end of the connecting shaft is in power connection with the unlocking device.

The technical scheme is that the unlocking device comprises an unlocking groove with an upward opening communicated with the sliding groove, a pressing block is arranged in the unlocking groove in a sliding mode, a pressing spring with a lower end fixedly connected with the lower end wall of the unlocking groove is fixedly arranged on the lower end face of the pressing block, a guide slide block is fixedly arranged on the left end face of the pressing block, a meshing groove with a leftward opening is communicated with the right side of the unlocking groove, a meshing gear with a left end meshed with the pressing block is rotatably arranged in the meshing groove, a first conical transmission gear is fixedly arranged on the front end face of the meshing gear, a second conical transmission gear is rotatably connected with the front end face of the first transmission gear through a connecting shaft, a third belt groove is communicated with the lower side of the meshing groove, the lower end of the connecting shaft is rotatably connected with the lower end wall of the third belt groove, a third belt pulley is fixedly arranged on the connecting shaft, and the rear side of the third belt groove is communicated with, the lower end of the connecting shaft is rotationally connected with the lower end wall of the third belt groove, a fourth belt pulley is fixedly arranged on the connecting shaft, and the fourth belt pulley is in power connection with the third belt pulley through a third belt.

The invention has the beneficial effects that: the invention has simple structure and convenient operation, the floor area of the drawing board is small when the drawing board is not used through the telescopic device of the telescopic drawing board, the drawing board is convenient to carry, when the drawing board is used, the drawing area is enlarged through the splicing of the telescopic drawing board and the drawing board, the drawing board is convenient to use, the telescopic drawing board and the drawing board are locked through the locking transmission device so as to be stably connected, the smoothness and the stability of the drawing use process are convenient, the locking transmission device can be used for dynamically connecting the first clamping device and the second clamping device, the rotating device works through the operating device so as to lead the first clamping device and the second clamping device to cooperatively work, simultaneously, the drawing paper in the drawing area after the first drawing area and the second drawing area are spliced is clamped, the problems of paper wrinkling and inconvenient operation in the separate independent clamping process are solved, the stability of the clamping device is improved through the baffle plate, and the device is recovered to the initial state through the unlocking device when the drawing frame is folded, the structure is convenient and quick to operate, more accords with ergonomics, and is convenient to carry and use.

Drawings

Fig. 1 is a schematic view of the internal overall structure of a drawing board with a clamping device according to the present invention;

FIG. 2 is a schematic top view of the drawing board of FIG. 1 illustrating the initial state of the drawing board according to the present invention;

FIG. 3 is a schematic view of the structure in the direction "A" of FIG. 2 according to the present invention;

FIG. 4 is an enlarged view of "B" in FIG. 2 according to the present invention;

FIG. 5 is an enlarged view of "C" in FIG. 2 according to the present invention;

FIG. 6 is an enlarged view of "D" in FIG. 2 according to the present invention;

FIG. 7 is an enlarged view of "E" in FIG. 2 according to the present invention;

FIG. 8 is a schematic view of the structure in the direction "F-F" shown in FIG. 1 according to the present invention;

FIG. 9 is a schematic view of the structure in the direction "G-G" of FIG. 1 according to the present invention;

FIG. 10 is an enlarged view of "H" in FIG. 1 according to the present invention.

Detailed Description

The invention will now be described in detail with reference to fig. 1-10, for ease of description, the orientations described below will now be defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

Referring to fig. 1 to 10, a drawing board with a clamping device according to an embodiment of the present invention includes a drawing board 10, a telescopic cavity 11 with an opening facing to the right is provided in the drawing board 10, a telescopic drawing board 12 is slidably provided in the telescopic cavity 11, a manipulating device is provided at the rear side of the telescopic cavity 11, the manipulating device is configured to drive the telescopic drawing board 12 to move to the right and slide out of the telescopic cavity 11, a supporting plate 13 is abutted against the right side of the drawing board 10, a T-shaped slot 14 with an opening facing to the left is provided in the supporting plate 13, a T-shaped block 15 with a right end extending into the T-shaped slot 14 and slidably connected with the T-shaped slot 14 is fixedly provided at the right end of the telescopic drawing board 12, the manipulating device drives the telescopic drawing board 12 to move horizontally and drives the telescopic drawing board to slide back and forth through the T-shaped block 15, a first clamping device is provided in the telescopic drawing board 12 for, the lower side of the first clamping device is provided with a first drawing area 16 with an opening facing forwards and a lower side communicated with the outside at the position of the front side of the telescopic cavity 11, the front side of the telescopic cavity 11 is provided with a second clamping device used for clamping the left side of drawing paper, the lower side of the first clamping device is provided with a second drawing area 17 with an opening facing forwards and a lower side communicated with the outside at the position of the front side of the telescopic cavity 11, the left side of the second drawing area 17 is communicated with a paper storage groove 73 with an opening facing right and used for placing the drawing paper, the right side of the second clamping device is provided with a locking transmission device used for being in power connection with the first clamping device, the locking transmission device locks and connects the drawing board 10 and the telescopic drawing board 12 to enable the first drawing area 16 to be communicated with the second drawing area 17, and simultaneously transmits the rotating state of the second clamping device to the first clamping device, so that the first clamping device and the second clamping device work synchronously to clamp the drawing paper in the drawing area.

Beneficially or exemplarily, the manipulating device includes a manipulating cavity 18, a moving groove 31 with a front side communicating with the telescopic cavity 11 is provided at the right side of the manipulating cavity 18, a first bevel gear 26 is provided in the manipulating cavity 18, a moving screw 27 with a right end extending into the moving groove 31 and a right end wall of the moving groove 31 rotatably connected is fixedly provided at the right end of the first bevel gear 26, a moving block 32 with a front end extending into the telescopic cavity 11 is threadedly connected to the moving screw 27, a moving chute 36 with a backward opening is provided at the front side of the telescopic cavity 11, a through groove 33 penetrating back and forth is provided in the telescopic drawing plate 12, a front end of the moving block 32 penetrates through the through groove 33 and extends into the moving chute 36, a second bevel gear 19 is engaged and connected to the rear end surface of the first bevel gear 26, a spline block 20 is spline-connected to the axis of the second bevel gear 19, a spline 25 with a rear end extending into the external space is fixedly provided at the rear end of the spline rotating block 20, the rear side of the operation cavity 18 is provided with a linkage device, the front side of the second bevel gear 19 in the operation cavity 18 is provided with an engaging spline housing 28 which is used for being in spline connection with the spline block 20, and the front end of the engaging spline housing 28 is fixedly connected with a rotating device.

Advantageously or exemplarily, said linkage means comprise a first strap slot 22 communicating with said operating chamber 18, a first belt pulley 23 which is provided with a ring shape in a rotating way in the first belt groove 22 and the lower end of which is fixedly connected with the rear end face of the second bevel gear 19 through a ring-shaped connecting block 21, a second belt pulley 70 is rotatably arranged at the right side of the first belt pulley 23 through a first rotating shaft 71, the second belt pulley 70 is in power connection with the first belt pulley 23 through a first belt 24, a thread groove 74 is communicated between the front side of the first belt groove 22 and the telescopic cavity 11, a rotary spline housing 76 which is threaded on the outer periphery and the front end of which is abutted against the telescopic drawing plate 12 is connected in the thread groove 74 through internal thread, a rotating spline shaft 75 is connected to the inner spline of the rotating spline housing 76, and the rear end of the rotating spline shaft 75 is fixedly connected with the first rotating shaft 71 through a torsion spring 72.

Advantageously or exemplarily, the rotating device comprises a rotating chamber 77 with a rear side communicating with the operating chamber 18, a third bevel gear 78 is rotatably disposed in the rotating chamber 77 through a second rotating shaft 29, the rear end of the second rotating shaft 29 is fixedly connected with the meshing spline housing 28, a fourth bevel gear 79 is connected to a left end surface of the third bevel gear 78 in a meshing manner, a third rotating shaft 80 with a left end rotatably connected with a left end wall of the rotating chamber 77 is fixedly disposed at an axial center of the fourth bevel gear 79, a rotating groove 81 is communicated with a right side of the rotating chamber 77, a right end of the third rotating shaft 80 penetrates through the rotating groove 81 and is fixedly connected with the second clamping device, a rotating wheel 82 is fixedly disposed on the third rotating shaft 80 in the rotating groove 81, grooves 42 with opposite openings are symmetrically disposed up and down in the rotating groove 81, and a clamping block 99 disposed in the upper groove 42 on an upper side is fixedly disposed on an upper end surface of the rotating wheel 82, the downside the recess 42 left side is equipped with sliding tray 55 with external space intercommunication, it stretches into the downside to slide to be equipped with the right-hand member in the sliding tray 55 dog 43 in the recess 42, dog 43 upper and lower symmetry has set firmly first subassembly 45 that resets, dog 43 left end face has set firmly the left end and has run through sliding tray 55 stretches into external space's pulling bull stick 44, the preceding terminal surface of pulling bull stick 44 has set firmly fixed block 56, sliding tray 55 downside is equipped with unlocking device.

Advantageously or exemplarily, the first clamping device comprises a slot 37 with a forward opening, the lower side of the slot 37 communicates with the first drawing area 16 through a connecting groove 98, a clamping rotating wheel 38 is rotatably arranged in the slot 37, a placing groove 39 with a forward opening is communicated with the upper side of the slot 37, a clamping block 40 with an upper end extending into the placing groove 39 and a clamping cushion 41 for protecting paper is fixedly arranged on the upper end surface of the clamping rotating wheel 38, the second clamping device has the same structure as the first clamping device, the slot 37 in the second clamping device communicates with the second drawing area 17 through the connecting groove 98, a driving spline sleeve 35 with a right end rotatably connected with the right end wall of the slot 37 is fixedly arranged at the axis of the clamping rotating wheel 38 in the first clamping device, a driving groove 34 is communicated between the left side of the slot 37 and the telescopic cavity 11, the left end of the transmission spline sleeve 35 extends into the transmission groove 34, the left side of the slot 37 in the second clamping device is communicated with the rotating groove 81, the right side of the slot 37 in the second clamping device is provided with a belt device which is in power connection with the locking transmission device, the right end of the third rotating shaft 80 penetrates through the slot 37 and is fixedly connected with the belt device after being fixedly connected with the axis of the clamping rotating wheel 38, and the third rotating shaft 80 is fixedly wound with a reset spring 84.

Beneficially or exemplarily, the belt device includes a first meshing cavity 85 whose left side is communicated with the slot 37 in the second clamping device, the right end of the third rotating shaft 80 extends into the first meshing cavity 85 and is fixedly provided with a fifth bevel gear 88, the lower end surface of the fifth bevel gear 88 is in meshing connection with a sixth bevel gear 87 which is rotatably connected through a fourth rotating shaft 86, the right side of the first meshing cavity 85 is communicated with a second meshing cavity 91 through a second belt slot 90, the second meshing cavity 91 is rotatably provided with a seventh bevel gear 93 through a fifth rotating shaft 92, the fifth rotating shaft 92 is in power connection with the fourth rotating shaft 86 through a second belt 89, the right end surface of the seventh bevel gear 93 is in meshing connection with an eighth bevel gear 94, and the right end surface of the eighth bevel gear 94 is fixedly provided with a sixth rotating shaft 95 which is fixedly connected with the locking transmission device.

Beneficially or exemplarily, the locking transmission device includes a pressing groove 46 with a right opening, a locking block 47 with a right end extending into an external space is slidably disposed in the pressing groove 46, second reset assemblies 48 are symmetrically and fixedly disposed in front and at back of the locking block 47, a connecting spline shaft 49 is rotatably disposed in the locking block 47, the left end of the connecting spline shaft 49 extends into the pressing groove 46 and is used for being in spline connection with the transmission spline housing 35, a connecting spline housing 96 is connected to the left end of the connecting spline shaft 49 through a spline, the left side of the pressing groove 46 is communicated with the second meshing cavity 91, the sixth rotating shaft 95 is fixedly connected to the left end of the connecting spline housing 96, an unlocking cable 51 is fixedly connected to the second reset assembly 48 on the upper side, a winding cavity 52 is disposed on the left side of the second reset assembly 48 through the winding groove 50, a winding reel 53 is rotatably disposed in the winding cavity 52 through a connecting shaft 54, the left end of the unlocking cable 51 penetrates through the winding groove 50 and extends into the winding cavity 52, the lower end of the connecting shaft 54 is in power connection with the unlocking device.

Advantageously or exemplarily, the unlocking device comprises an unlocking groove 57 with an upward opening and communicated with the sliding groove 55, a pressing block 58 is arranged in the unlocking groove 57 in a sliding manner, a pressing spring 59 with a lower end fixedly connected with the lower end wall of the unlocking groove 57 is fixedly arranged on the lower end surface of the pressing block 58, a guide sliding block 60 is fixedly arranged on the left end surface of the pressing block 58, an engaging groove 61 with an upward opening and communicated with the right side of the unlocking groove 57, an engaging gear 62 with a left end engaged with the pressing block 58 is rotatably arranged in the engaging groove 61, a first conical transmission gear 63 is fixedly arranged on the front end surface of the engaging gear 62, a second conical transmission gear 69 rotatably connected with the engaging groove 61 through a connecting shaft 65 is engaged and connected with the front end surface of the first transmission gear 63, a third belt groove 66 is communicated with the lower side of the engaging groove 61, the lower end of the connecting shaft 65 is rotatably connected with the lower end wall of the third belt groove 66, and a third, the rear side of the third belt groove 66 is communicated with the winding cavity 52, the lower end of the connecting shaft 54 is rotatably connected with the lower end wall of the third belt groove 66, a fourth belt pulley is fixedly arranged on the connecting shaft, and the fourth belt pulley is in power connection with the third belt pulley 67 through a third belt 68.

In the initial state, the retractable drawing board 12 is retracted into the retractable cavity 11, the second bevel gear 19 is engaged with the first bevel gear 26, the spline block 20 is splined with the second bevel gear 19, and the clamping block 40 is located in the placing groove 39.

When the device needs to work, the rotating rod 25 is rotated manually, the spline block 20 drives the second bevel gear 19 to rotate, the first bevel gear 26 rotates, the moving screw 27 rotates, the moving block 32 drives the telescopic drawing plate 12 and the supporting plate 13 to move rightwards, meanwhile, the second bevel gear 19 drives the first belt pulley 23 to rotate, the second belt pulley 70 drives the first rotating shaft 71 to rotate through the first belt 24, the rotating spline housing 76 does not rotate when the telescopic drawing plate 12 does not exit from the telescopic cavity 11, the torsion spring 72 stores force, when the telescopic drawing plate 12 moves rightwards and exits from the telescopic cavity 11, the torsion spring 72 rotates the rotating spline shaft 75 to rotate, the rotating spline housing 76 rotates, the rotating spline housing 76 moves forwards while rotating under the action of the threaded groove 74 to push the telescopic drawing plate 12 to move forwards along the T-shaped groove 14, the telescopic drawing plate 12 extrudes the locking block 47 to drive the connecting spline shaft 49 to shrink leftwards into the extrusion groove 46, when the retractable drawing board 12 is completely abutted against the drawing board 10, the locking block 47 drives the connecting spline shaft 49 to move rightwards under the action of the second reset component 48 to the inside of the transmission groove 34, so that the connecting spline shaft 49 is in spline connection with the transmission spline housing 35, the drawing board 10 is in locking connection with the retractable drawing board 12, the first drawing area 16 is spliced with the second drawing area 17, then drawing paper is taken out from the paper storage groove 73 and placed in the first drawing area 16 and the second drawing area 17, the rotating rod 25 is pressed forwards, so that the spline block 20 is in spline connection with the meshing spline housing 28, then the rotating rod 25 is manually rotated, the second rotating shaft 29 is rotated, so that the third bevel gear 78 drives the fourth bevel gear 79 to rotate, the third rotating shaft 80 is rotated to drive the clamping runner 38 in the second clamping device to rotate, and the clamping block 40 rotates anticlockwise on the right side to clamp the drawing paper in the second drawing area 17, and the third rotating shaft 80 rotates to make the fifth bevel gear 88 rotate, the seventh bevel gear 93 rotates through the second belt 89, the sixth rotating shaft 95 rotates to drive the connecting spline housing 96 to rotate, the connecting spline shaft 49 drives the transmission spline housing 35 to rotate so that the clamping block 40 in the first clamping device rotates counterclockwise in the right view to clamp the drawing paper in the first drawing area 16 for drawing, meanwhile, the third rotating shaft 80 drives the rotating wheel 82 to rotate, the fixture block 99 rotates into the groove 42 on the lower side and is locked through the fixture block 43, the first clamping device and the second clamping device are fixed, the installation of the drawing board is completed, and drawing can be performed, when the drawing board is folded, the rotating rod 44 is pulled leftwards to enable the fixture block 43 to withdraw from the groove 42, the fixture block 99 rotates clockwise in the right view under the action of the reset spring 84 to restore the initial position, and simultaneously, the clamping rotating wheel 38 rotates clockwise in the right view to restore the initial position, then the clamping of the drawing paper is released, and then the pulling rotating rod 44 is pulled to move leftwards, so that the fixed block 56 is positioned at the upper side of the unlocking groove 57, then the pulling rotating rod 44 is rotated, so that the fixed block 56 rotates to press the pressing block 58 downwards, so that the meshing gear 62 rotates, the first transmission gear 63 drives the second transmission gear 69 to rotate, the connecting shaft 54 rotates through the third belt 68 to drive the winding wheel 53 to rotate clockwise when looking down, the locking block 47 of the unlocking pull wire 51 drives the connecting spline shaft 49 to exit from the transmission groove 34, and the rotating rod 25 is rotated reversely, so that the telescopic drawing board 12 is retracted into the telescopic cavity 11, and the initial state of the drawing board is recovered.

The invention has the beneficial effects that: the invention has simple structure and convenient operation, the floor area of the drawing board is small when the drawing board is not used through the telescopic device of the telescopic drawing board, the drawing board is convenient to carry, when the drawing board is used, the drawing area is enlarged through the splicing of the telescopic drawing board and the drawing board, the drawing board is convenient to use, the telescopic drawing board and the drawing board are locked through the locking transmission device so as to be stably connected, the smoothness and the stability of the drawing use process are convenient, the locking transmission device can be used for dynamically connecting the first clamping device and the second clamping device, the rotating device works through the operating device so as to lead the first clamping device and the second clamping device to cooperatively work, simultaneously, the drawing paper in the drawing area after the first drawing area and the second drawing area are spliced is clamped, the problems of paper wrinkling and inconvenient operation in the separate independent clamping process are solved, the stability of the clamping device is improved through the baffle plate, and the device is recovered to the initial state through the unlocking device when the drawing frame is folded, the structure is convenient and quick to operate, more accords with ergonomics, and is convenient to carry and use.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.