Constant-temperature negative-pressure adsorption intelligent drawing board

Abstract

A constant-temperature negative-pressure adsorption intelligent drawing board comprises a supporting base assembly, a hollow drawing table body assembly, an airflow circulation treatment device, an annular dust removal and air curtain assembly and an intelligent control device. An airflow circulating treatment device is integrated in the supporting base assembly, and the top of the supporting base assembly bears a hollow drawing table body assembly with an airflow pressure equalizing cavity and a microporous adsorption panel; a variable-diameter air guide hole array is arranged in the airflow pressure equalizing cavity to balance flow resistance; the airflow circulation treatment device comprises a bidirectional negative pressure power unit, a heat exchange chamber connected in series and an airflow direction switching valve to construct a bidirectional loop: one end is communicated with a pressure equalizing cavity to generate negative pressure adsorption, and the other end is communicated with an annular dust removal and air curtain assembly after being heated by the heat exchange chamber; according to the invention, the functions of negative-pressure fixation, constant-temperature hot air curtain and coanda effect dust removal are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a constant-temperature negative pressure adsorption intelligent drawing board. BACKGROUND

[0002] With the development of engineering design and artistic creation industry, as a basic tool, the functional requirements of drawing board are increasingly improved. Although there are various auxiliary drawing equipment on the market at present, in the actual use process, the existing technical scheme still has the following obvious defects:

[0003] 1. Single function and low energy efficiency:

[0004] The existing electronic or mechanical drawing board is usually single in function. The internal motor of the drawing board with negative pressure adsorption function will generate a large amount of heat for a long time, which is usually regarded as waste heat and directly discharged, causing energy waste. At the same time, if it is used in cold environment, the user often needs to additionally configure a heating device, resulting in complicated desktop equipment, and the drawing hand area cannot be accurately heated.

[0005] 2. Non-uniform negative pressure adsorption:

[0006] The existing negative pressure adsorption type drawing board usually adopts uniformly distributed pore structure. However, limited by the position of the air suction port (usually located at the center or one side), the farther away from the air suction port, the greater the pipe flow resistance, resulting in the distribution of the adsorption force on the surface of the panel showing "strong in the center, weak in the edge" or "strong in the near end, weak in the far end". This makes the edge of the large-size drawing often not tightly adsorbed, easy to be warped or slid, and seriously affects the accuracy of drawing.

[0007] 3. Lack of cleaning means and environmental adaptability:

[0008] In the process of drawing, rubber crumbs or pencil dust are inevitably produced. The existing technology lacks automatic cleaning means, and the user needs to clean manually frequently. In addition, fine dust is easy to accumulate on the back of the drawing, causing uneven surface of the drawing. In addition, in humid climate, paper drawing is easy to swell and deform due to moisture absorption. The current drawing board lacks temperature and humidity control mechanism for the micro environment of the drawing.

[0009] In summary, it is a technical problem to be solved in the industry to develop an intelligent drawing board which has uniform adsorption, constant temperature heating, automatic dust removal and high energy efficiency. The technical background part of the present application aims to explain the current situation in the prior art. The deficiencies of the prior art show that this part of the content will provide necessary background information for understanding the technical contribution and innovation points of the present application. The signals disclosed in this background technology part only aim to increase the understanding of the overall background of the present application, and should not be regarded as implying subjective consciousness in any form. SUMMARY

[0010] In view of the above, the purpose of the present application is to provide a constant-temperature negative pressure adsorption intelligent drawing board.

[0011] In order to achieve the purpose of the present application, the technical solution adopted is a constant-temperature negative pressure adsorption intelligent drawing board, comprising:

[0012] Support base assembly, hollow drawing table body assembly, air flow circulation processing device, annular dust removal and air curtain assembly, intelligent control device;

[0013] The support base assembly is a box structure with a containing cavity inside, the bottom wall inside is integrated with a mounting structure for fixing the air flow circulation processing device, the side wall is provided with an air inlet heat dissipation grille with a dust screen, and the top edge extends inward to form a mounting surface for supporting the hollow drawing table body assembly;

[0014] The hollow drawing table body assembly is horizontally fixed on the mounting surface of the support base assembly, and the inside is provided with an air flow equalization cavity, and the top surface is covered with a micro-porous adsorption panel filled with adsorption micro-pores;

[0015] The air flow circulation processing device is arranged inside the support base assembly, comprising a bidirectional negative pressure power unit, a heat exchange chamber, an air flow direction switching valve and a connecting pipeline;

[0016] The bidirectional negative pressure power unit comprises a shell and a motor and an impeller assembly arranged in the shell, and the shell is provided with an air suction port and an air exhaust port;

[0017] The heat exchange chamber is arranged in series at the lower end of the air exhaust path of the bidirectional negative pressure power unit, and a PTC heating grid assembly is arranged transversely inside, forming a heat exchange path for air flow;

[0018] The air flow circulation processing device is constructed with a bidirectional air flow loop: the first loop connects the air flow equalization cavity and the air suction port through the pipeline, for extracting air from the cavity to generate negative pressure adsorption force; the second loop is connected in sequence through the pipeline, the air exhaust port, the heat exchange chamber and the annular dust removal and air curtain assembly, for heating the exhaust air to form a hot air curtain;

[0019] The annular dust removal and air curtain assembly is closed along the side of the hollow drawing table body assembly, and is communicated with the output end of the air flow circulation processing device;

[0020] The intelligent control terminal device is electrically connected to the air flow circulation processing device, and realizes negative pressure fixation of the drawing plane and temperature control dust removal of the side at the same time through a single power source.

[0021] Further, the hollow drawing table body assembly comprises a lower layer pressure equalizing groove embedded on the top of the support base assembly and a microporous adsorption panel covering the same; an internal flow guide partition structure is horizontally suspended in the airflow pressure equalizing cavity, which divides the cavity into an upper layer pressure stabilizing adsorption cavity and a lower layer flow guide collecting cavity; a support column is arranged on the lower surface of the microporous adsorption panel and abuts against the internal flow guide partition structure, so as to prevent negative pressure deformation.

[0022] Further, a plurality of variable-diameter air guide holes are arranged on the internal flow guide partition structure, and the flow passage cross-sectional areas of the air guide holes are distributed in a gradient increasing manner from the center to the edge, so as to balance the flow resistance difference in the pressure stabilizing adsorption cavity and ensure uniform adsorption force on the surface of the microporous adsorption panel.

[0023] Further, the connecting pipeline comprises: a first pipeline connecting the airflow pressure equalizing cavity and the air suction port of the bidirectional negative pressure power unit; a second pipeline connecting the air exhaust port of the bidirectional negative pressure power unit and the input end of the heat exchange chamber; and a third pipeline connecting the output port of the airflow direction switching valve and the annular dust removal and air curtain assembly; the airflow direction switching valve is arranged at the lower end of the heat exchange chamber.

[0024] Further, the bidirectional negative pressure power unit has forward and reverse rotation modes: in the forward rotation mode, air is drawn from the airflow pressure equalizing cavity and exhausted to the heat exchange chamber, so as to realize adsorption and heating circulation; in the reverse rotation mode, the airflow direction is reversed, air is blown into the airflow pressure equalizing cavity to form an air cushion layer, and the drawing paper is removed.

[0025] Further, the PTC heating grid assembly comprises alternately arranged corrugated aluminum strips and PTC ceramic heating cores; the outlet end of the heat exchange chamber is further provided with a temperature monitoring probe, which is signal connected with the intelligent control terminal device and used for feeding back the airflow temperature.

[0026] Further, the airflow direction switching valve is a multi-way reversing valve and has three state positions: the first state position connects the main air inlet and the external exhaust pressure outlet, cuts off the circulation loop and only performs negative pressure adsorption; the second state position connects the main air inlet and the circulation air outlet, guides the heated airflow into the annular dust removal and air curtain assembly and performs constant temperature circulation; and the third state position is an intermediate mixed state, which adjusts the air volume entering the annular assembly.

[0027] Further, the annular dust removal and air curtain assembly comprises an annular air duct groove and an air outlet slit structure arranged on the inner edge of the top of the annular air duct groove; the air outlet slit structure is inwardly inclined and points to the center of the drawing board, forms an included angle with the horizontal plane and is configured to make the ejected airflow adhere to the surface of the microporous adsorption panel to form a laminar flow.

[0028] Further, a parallel dust collecting groove is arranged outside the annular dust removal and air curtain assembly, and an outwardly extending flow guide curved surface is arranged on the upper lip of the air outlet slit.

[0029] Further, the intelligent control device comprises a microcontroller and an environmental monitoring sensor group, which adjusts the heating power and the circulating air volume according to the environmental humidity; the annular air duct groove body is made of a heat-conducting material and closely adheres to the edge of the hollow drawing table body assembly, and the edge of the drawing paper is heated by the circulating hot air flow through heat conduction.

[0030] The present application has the following advantages:

[0031] 1. Efficient use of energy and system integration:

[0032] The present application innovatively uses a bidirectional negative pressure power unit as the power source for negative pressure adsorption and the air source for the hot air curtain. The waste heat generated by the motor operation is recycled through the air flow circulation processing device, and is supplemented by PTC heating, and is delivered to the hot air curtain around the drawing board. This design not only avoids the problem of independent adsorption system and heating system in traditional equipment, but also effectively utilizes the motor waste heat, and significantly reduces the overall energy consumption of the equipment.

[0033] 2. Uniform adsorption force to improve drawing accuracy:

[0034] In view of the problem of uneven adsorption force distribution of the traditional negative pressure drawing board, the present application designs an internal flow guide partition structure with a variable-diameter air guide hole array in the air flow equalization chamber. The cross-sectional area of the air guide hole increases gradually from the center to the edge, effectively balancing the flow resistance difference in different areas. No matter where the drawing paper is located on the panel, uniform adsorption force can be obtained, preventing the drawing paper from being locally raised or the edge from being warped, thereby ensuring high-precision drawing work.

[0035] 3. Intelligent environmental adaptation and ergonomic comfort:

[0036] The present application forms a laminar hot air curtain around the drawing area through the annular dust removal and air curtain assembly, solves the problem of hand stiffness during drawing in winter, and improves the drawing comfort.

[0037] 4. Innovative air flow dust removal mechanism (application of Coanda effect):

[0038] The Coanda effect is used to realize passive switching of the air flow direction. In the cleaning mode, the air flow is deflected by adhering to the wall by increasing the flow rate, and the originally inward heat preservation air flow is changed into outward diffusion dust removal air flow, which can automatically blow the rubber crumbs and dust on the surface of the panel into the dust collection groove. This solves the problem of difficult cleaning of traditional drawing boards, and the dust is easy to pad high on the drawing paper, which affects the pen touch, and no additional mechanical moving parts are needed. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0040] Figure 1 is a schematic diagram of the overall structure of the present application;

[0041] Figure 2 is a perspective exploded view of the present application;

[0042] Figure 3 is a partial sectional view of the drawing table body assembly of the present application;

[0043] In the drawings, 100 is a support base assembly, 101 is a ring-shaped dust removal and air curtain assembly, 102 is a micro-porous adsorption panel, 103 is an air inlet heat dissipation grid, 104 is a lower layer pressure equalization groove body, 105 is a variable-diameter air guide hole array, 106 is an internal flow guide partition structure, 107 is a bidirectional negative pressure power unit, 108 is a heat exchange chamber, 109 is a PTC heating grid assembly, 110 is an air flow direction switching valve, 111 is a support column, and 112 is a lower layer flow guide collection cavity. DETAILED DESCRIPTION

[0044] The present application will be described in the embodiments below according to the drawings and some embodiments.

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0046] The constant-temperature negative pressure adsorption intelligent drawing board of the present application will be further described below in combination with the drawings and embodiments, which aims to help understand the technical concept and specific implementation mode of the present application, but the description should not be understood as a limitation on the protection scope of the present application.

[0047] Referring to Figures 1-2 As shown in the drawings, the present embodiment provides a constant-temperature negative pressure adsorption intelligent drawing board, which mainly consists of a support base assembly, a hollow drawing table body assembly, an air flow circulation treatment device, a ring-shaped dust removal and air curtain assembly, and an intelligent control device.

[0048] In this embodiment, the support base assembly 100 as a whole is installed on the basis of the design of the box structure with a containing cavity inside. In order to ensure the heat dissipation and air circulation of the internal electrical components, the side wall is provided with an air inlet heat dissipation grille 103, and is equipped with a dust screen to prevent external dust from entering the equipment. The bottom wall of the support base assembly 100 is integrated with a shock-absorbing mounting structure for fixing the air circulation processing device, and the top edge extends inward to form a stepped mounting surface for stable support of the hollow drawing table body assembly.

[0049] In this embodiment, the hollow drawing table body assembly is horizontally fixed on the mounting surface, including a lower layer pressure equalizing groove 104 embedded in the bottom and a microporous adsorption panel 102 covered thereon. The two are buckled to form a closed air flow pressure equalizing cavity. The surface of the microporous adsorption panel 102 is covered with precisely processed adsorption micropores for air permeability. In order to prevent the large-area panel from being deformed inward in the negative pressure working state, affecting the drawing accuracy, the lower surface of the microporous adsorption panel 102 is provided with a plurality of support columns 111 which abut downward on the internal structure to act as support stiffeners.

[0050] In this embodiment, the bidirectional negative pressure power unit 107 includes a shell and an embedded motor and impeller assembly, and the shell is provided with an air suction port and an air exhaust port. The heat exchange chamber 108 matched therewith is connected in series at the lower end of the exhaust path. The PTC heating grid assembly 109 is horizontally arranged inside the heat exchange chamber 108. The assembly is composed of alternating corrugated heat dissipation aluminum strips and PTC ceramic heating cores, which has the characteristics of small thermal resistance and high heat exchange efficiency. At the same time, a temperature monitoring probe is arranged at the outlet end of the heat exchange chamber 108 to feedback the air temperature to the intelligent control device in real time.

[0051] Pipeline connection and loop:

[0052] First loop (adsorption loop): The air flow pressure equalizing cavity of the hollow drawing table body assembly and the air suction port of the power unit are connected by the first pipeline. When the unit is working, air is extracted from the cavity to form a negative pressure on the surface of the microporous adsorption panel 102, thereby firmly adsorbing the drawing paper.

[0053] Second loop (hot air curtain loop): The exhaust port of the power unit is connected to the input end of the heat exchange chamber 108 through the second pipeline, and the output port of the air flow direction switching valve 110 is connected to the annular dust removal and air curtain assembly 101 through the third pipeline. The air flow with a certain pressure discharged from the power unit is heated by the heat exchange chamber 108 and then delivered to the annular assembly around the drawing board.

[0054] Multi-mode switching control:

[0055] The air flow direction switching valve 110 is preferably a three-position multi-way reversing valve, installed at the lower end of the heat exchange chamber 108. Through the instructions of the intelligent control device, three working states can be realized:

[0056] The first state position (summer / adsorption mode): connect the main air inlet and the external exhaust port (leading to the outside of the base), and cut off the loop leading to the annular assembly. At this time, only negative pressure adsorption is performed, and the waste heat generated by the motor is directly discharged to avoid the artist feeling hot.

[0057] The second state position (winter / constant temperature mode): connect the main air inlet and the circulating air outlet, and direct all the heated air into the annular dust removal and air curtain assembly 101. This not only utilizes the waste heat of the motor, but also forms a hot air curtain around the drawing area through PTC auxiliary heating, solving the problem of stiff hands in winter.

[0058] The third state position (mixed adjustment mode): the valve core is in the middle position, part of the exhaust is discharged externally, and part of it enters the circulation, which is used for fine adjustment of the air volume and temperature of the air curtain.

[0059] In this embodiment, an internal flow guide partition structure 106 is horizontally suspended in the air flow equalization chamber of the hollow drawing table body assembly, dividing the chamber into an upper stable adsorption chamber and a lower flow guide collection chamber 112. The key is that a variable-diameter air guide hole array 105 is opened on the partition structure. Considering that the air inlet is usually located at the center or a specific side, the flow area of the air guide hole is designed to be distributed in a gradient increasing from the center to the edge. That is, the farther away from the air suction negative pressure source, the larger the hole diameter. This design effectively balances the flow resistance difference, ensuring that the adsorption force received by the drawing paper remains uniform and consistent whether it is located at the center or edge of the panel.

[0060] Coanda effect dust removal air curtain:

[0061] The annular dust removal and air curtain assembly 101 is closed along the periphery of the drawing table. Its structure includes an annular air duct slot body and an air outlet slit structure at the top.

[0062] Normal operating state (laminar warming): the air outlet slit structure is inclined inward and forms a certain angle with the horizontal plane. When the air flow rate is moderate, the ejected warm air flow closely adheres to the surface of the micro-porous adsorption panel 102 to form a center-converging laminar flow. This layer of hot air not only warms the hands, but also prevents the drawing paper from being damp and deformed.

[0063] Clean dust state (Conda effect): The outside of the annular assembly is provided with parallel dust collection grooves, and the upper lip of the air outlet slit is designed with a special outwardly extending flow guide curve. When the user selects the "cleaning mode", the motor speed is increased, and the airflow speed reaches the set cleaning threshold. At this time, using the Conda effect, the high-speed airflow is no longer flowing inward, but is deflected along the flow guide curve of the upper lip, and the flow direction is changed to outward diffusion. This reverse airflow blows the rubber crumbs and dust on the surface of the panel into the dust collection groove outside, achieving automatic cleaning.

[0064] 1. Positive and negative rotation desorption:

[0065] The bidirectional negative pressure power unit 107 has a positive and negative rotation function. When the drawing is finished and the drawing paper needs to be removed, the intelligent control device controls the motor to enter the reverse mode. The airflow direction is instantly reversed, and the original air inlet becomes an air outlet, blowing air into the airflow equalization chamber. The airflow passes through the microporous adsorption panel 102, forming an air cushion layer between the drawing paper and the panel, eliminating the electrostatic adsorption and vacuum adsorption force, so that the user can easily and damagelessly remove the drawing paper.

[0066] 2. Environment adaptive control:

[0067] The intelligent control device integrates a microcontroller and an environment monitoring sensor group (including temperature and humidity sensors).

[0068] Humidity intervention: When it is monitored that the environmental humidity is high, which can easily cause the drawing paper to absorb moisture and wrinkle, the system will automatically increase the PTC heating power and increase the circulating air volume.

[0069] Edge heating: The annular air duct groove body is specially made of a heat-conducting material (such as aluminum alloy) and closely fits the edge of the hollow drawing table body assembly. When the circulating hot airflow flows through the groove body, it directly heats the edge of the drawing board through heat conduction, which has a significant effect on the edge flatness control of large-size drawing paper.

[0070] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application,

[0071] The specific embodiments of the present application are only illustrative and do not limit the protection scope of the present application. The specific embodiments of the present application can be variously changed and modified without departing from the gist and spirit of the present application. These changes and modifications all belong to the scope covered by the present application.

[0072] The "central control unit", "microcontroller" and other control components mentioned in the technical solution embodiment can be common standard controllers on the market, such as single-chip microcomputers (MCU), programmable logic controllers (PLC) or processor-based embedded systems.

[0073] In the technical solution, the control components are used to realize the cooperation and logic control among the above-mentioned structural components or functional modules. For those skilled in the art, the control logic of the components can be realized by programming or circuit design according to the structural layout and functional relationship disclosed in the patent, which is a common technical means and is not the core of the patent.

[0074] Therefore, the protection scope of the patent aims to protect the physical structure and its cooperative working relationship, and is not related to the specific circuit design inside the control unit, the software program code or firmware algorithm itself. Any existing or future developed control method capable of realizing the same control function can be applied to the embodiments of the patent, and the patent does not limit this.

[0075] It is worth noting that in the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified. In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; the circuits described in the present application are common circuits in the art, and other related components are common components in the art. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0076] For those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the essential elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A constant temperature negative pressure adsorption intelligent drawing board, characterized in that, The application relates to a drawing device. The support base assembly is a box structure with a containing cavity in the inside, the bottom wall of the box structure is internally integrated with a mounting structure for fixing the air flow circulation treatment device, the side wall of the box structure is provided with an air inlet heat dissipation grille with a dustproof screen, and the top edge of the box structure is inwardly extended to form a mounting surface for supporting the hollow drawing table body assembly. The hollow drawing table body assembly is horizontally fixed on the mounting surface of the support base assembly, the inside of the hollow drawing table body assembly is provided with an air flow pressure equalizing cavity, and the top surface of the hollow drawing table body assembly is covered with a micro-porous adsorption panel filled with adsorbing micro-pores. The air flow circulation treatment device is arranged in the inside of the support base assembly and comprises a bidirectional negative pressure power unit, a heat exchange chamber, an air flow direction switching valve and a connecting pipeline. The bidirectional negative pressure power unit comprises a shell, a motor arranged in the shell and an impeller assembly, and the shell is provided with an air suction port and an air exhaust port. The heat exchange chamber is serially arranged at the lower end of the air exhaust path of the bidirectional negative pressure power unit, the inside of the heat exchange chamber is horizontally arranged with a PTC heating grid assembly, and the PTC heating grid assembly forms a heat exchange path through which air flows. The air flow circulation treatment device is constructed with a bidirectional air flow loop: a first loop is connected with the air flow pressure equalizing cavity and the air suction port through a pipeline and is used for extracting air from the cavity to generate negative pressure adsorption force; and a second loop is sequentially connected with the air exhaust port, the heat exchange chamber and the annular dust removal and air curtain assembly through a pipeline and is used for heating the discharged air flow to form a hot air curtain. The annular dust removal and air curtain assembly is closed along the side of the hollow drawing table body assembly and is communicated with the output end of the air flow circulation treatment device. The intelligent control terminal device is electrically connected with the air flow circulation treatment device and simultaneously realizes negative pressure fixation of a drawing plane and temperature control dust removal of the side through a single power source. The hollow drawing table body assembly comprises a lower layer pressure equalizing groove embedded in the top of the support base assembly and a micro-porous adsorption panel covering the lower layer pressure equalizing groove; the air flow pressure equalizing cavity is horizontally suspended with an internal flow guide partition structure, and the cavity is divided into an upper layer pressure equalizing and adsorbing cavity and a lower layer flow guide and collecting cavity; the lower surface of the micro-porous adsorption panel is provided with a support column abutting against the internal flow guide partition structure to prevent negative pressure deformation.

2. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 1, characterized in that, The internal flow guide partition structure is provided with an array of variable-diameter air guide holes, and the flow passage cross-sectional area of the air guide holes is distributed in a gradient increasing manner from the center to the edge, so as to balance the flow resistance difference in the pressure equalizing and adsorbing cavity and ensure that the suction force of the micro-porous adsorption panel surface is uniform.

3. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 2, characterized in that, The connecting pipeline comprises: a first pipeline connecting the air flow pressure equalizing cavity and the air suction port of the bidirectional negative pressure power unit; a second pipeline connecting the air exhaust port of the bidirectional negative pressure power unit and the input end of the heat exchange chamber; and a third pipeline connecting the output port of the air flow direction switching valve and the annular dust removal and air curtain assembly; and the air flow direction switching valve is arranged at the lower end of the heat exchange chamber.

4. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 1, characterized in that, The bidirectional negative pressure power unit has forward and reverse rotation modes: in the forward mode, air is extracted from the air flow pressure equalizing cavity and exhausted to the heat exchange chamber to realize adsorption and heating circulation; and in the reverse mode, the air flow direction is reversed, air is blown into the air flow pressure equalizing cavity to form an air cushion layer and assist in removing the drawing paper.

5. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 1, characterized in that, ​ 6. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 1, characterized in that, The PTC heating grid assembly comprises corrugated heat dissipation aluminum strips and PTC ceramic heating cores arranged alternately; the outlet end of the heat exchange chamber is further provided with a temperature monitoring probe, which is signal connected with the intelligent control terminal device, and is used for feeding back the air flow temperature.

7. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 4, characterized in that, The air flow direction switching valve is a multi-way reversing valve, and has three state positions: the first state position connects the main air inlet and the external exhaust pressure outlet, cuts off the circulation loop, and only performs negative pressure adsorption; the second state position connects the main air inlet and the circulation air outlet, guides the heated air flow into the annular dust removal and air curtain assembly, and performs constant temperature circulation; and the third state position is an intermediate mixed state, which adjusts the air volume entering the annular assembly.

8. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 1, characterized in that, The annular dust removal and air curtain assembly comprises an annular air duct groove body and an air outlet slit structure arranged on the inner edge of the top of the annular air duct groove body; the air outlet slit structure is inwardly inclined and points to the center of the drawing board, and forms an included angle with the horizontal plane, and is configured to make the sprayed air flow adhere to the surface of the microporous adsorption panel to form laminar flow.

9. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 8, characterized in that, Parallel dust collection grooves are arranged outside the annular dust removal and air curtain assembly, and the upper lip of the air outlet slit is designed with an outwardly extending flow guide curved surface.

10. The constant-temperature negative pressure adsorption intelligent drawing board according to claim 1, characterized in that, The intelligent control device comprises a microcontroller and an environmental monitoring sensor group, and adjusts the heating power and the circulating air volume according to the environmental humidity; the annular air duct groove body is made of a heat conductive material, is closely attached to the edge of the hollow drawing table body assembly, and uses the circulating hot air flow to heat the edge of the drawing paper through heat conduction.

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