Head mounting device and method for adjusting pressure through pneumatic control

Abstract

The invention discloses a head pasting device and method capable of adjusting pressure through pneumatic control, and belongs to the technical field of head pasting, an upper rotating shaft and a lower rotating shaft are mounted on a rotating shaft mounting seat through rotating bearings, a power device used for driving the upper rotating shaft to rotate is arranged on the rotating shaft mounting seat, and the lower rotating shaft is connected with the upper rotating shaft through a bolt; a closed cavity is formed in the connecting position of the upper rotating shaft and the lower rotating shaft, an air bag diaphragm and a piston are arranged in the closed cavity, a hollow guide shaft is coaxially arranged on the piston, the hollow guide shaft is installed in the lower rotating shaft through a guide shaft sleeve and connected with the suction nozzle assembly, and the pneumatic control pressure assembly is communicated with the closed cavity and the hollow guide shaft. According to the scheme, an air control pressure assembly is adopted, air pressure input is dynamically adjusted through an electric proportional valve, flexible transmission of an air bag diaphragm and a piston is combined, air pressure is accurately converted into linear displacement, and suction nozzle contact pressure is driven to follow a set value in real time.

Description

Technical Field

[0001] The present invention belongs to the technical field of numerical control equipment, and in particular to a head mounting device and method for pneumatically controlling and adjusting pressure. Background Art

[0002] With the rapid development of electronic technology and the information industry, in the production process of electronic products, flexible printed circuit boards (abbreviated as FPCs) are printed circuit boards with high reliability and excellent flexibility. They are light in weight, resistant to bending, and have excellent electrical characteristics, so they are increasingly widely used.

[0003] In the production process of FPCs, film-like auxiliary materials with relatively thin volumes such as pressure-sensitive adhesives and PI films are often used to reinforce the mechanical strength of FPCs for subsequent surface mounting operations. Reinforcement bonding is a crucial production process in the production process of FPCs, which determines the product quality of FPCs. At present, the anti-pressure damage technology of bonding machines on the market is unstable, mainly having problems such as complex anti-pressure damage structure design and inconvenient detection of bonding pressure, resulting in a high defective rate of products during FPC production and the need for continuous adjustment of pressure, greatly reducing production efficiency. Therefore, the existing technology needs to be improved and developed.

[0004] For the existing heads, pressure control mainly installs a spring, and the pressure depends on the deformation of the spring. Due to differences in spring processing and deformation after long-term use, the deformation cannot be consistent, resulting in large differences in machines and poor consistency of the produced products. For the existing traditional heads, since the pressure depends on the deformation of the spring, the greater the compression amount, the greater the pressure, and there will be problems of damaging products due to inconsistent spring compression amounts caused by uneven product surfaces and large downward travel distances. Summary of the Invention

[0005] Object of the Invention: To provide a head mounting device and method for pneumatically controlling and adjusting pressure to solve the above problems existing in the prior art.

[0006] Technical Solution: A head mounting device for pneumatically controlling and adjusting pressure includes: a rotary positioning assembly, on which a suction nozzle assembly and a pneumatic pressure assembly are provided. The rotary positioning assembly includes: an upper rotary shaft, both the upper rotary shaft and the lower rotary shaft are installed on a rotary shaft mounting seat through rotary bearings. A power device for driving the upper rotary shaft to rotate is provided on the rotary shaft mounting seat. The lower rotary shaft is connected to the upper rotary shaft by bolts. A closed cavity is provided at the connection of the upper rotary shaft and the lower rotary shaft. An airbag diaphragm and a piston are provided in the closed cavity. A hollow guide shaft is coaxially provided on the piston. The hollow guide shaft is installed in the lower rotary shaft through a guide shaft sleeve. The hollow guide shaft is connected to the suction nozzle assembly. The pneumatic pressure assembly is communicated with the closed cavity and the hollow guide shaft.

[0007] Further, the airbag diaphragm is installed at the connection of the upper rotating shaft and the lower rotating shaft through an airbag diaphragm pressing block.

[0008] Further, the pneumatic pressure control assembly includes: a tracheal joint. A first air passage is provided on the upper rotating shaft, and a first through hole is provided on the first air passage. Two first sealing rings for sealing the first through hole are provided between the upper rotating shaft and the rotating shaft mounting seat. A tracheal joint is provided on the rotating shaft mounting seat, and the tracheal joint is communicated with the first through hole. The first air passage is communicated with the closed cavity.

[0009] Further, the pneumatic pressure control assembly further includes: a vacuum joint. A second through hole is provided on the hollow guide shaft. A second sealing ring for sealing the second through hole is provided between the lower rotating shaft and the hollow guide shaft. A vacuum joint is provided on the rotating shaft mounting seat, and the vacuum joint is communicated with the second through hole.

[0010] Further, a third through hole is provided on the lower rotating shaft. Two third sealing rings are provided between the lower rotating shaft and the rotating shaft mounting seat, and an intermediate spacer for supporting the third sealing rings is provided between the two third sealing rings.

[0011] Further, the power device includes: a driving motor. The driving motor is installed on the rotating shaft mounting seat through a motor mounting seat, and the driving motor is connected to the upper rotating shaft through a coupling.

[0012] Further, the motor mounting seat is installed on the rotating shaft mounting seat through a locking nut sleeved on the upper rotating shaft.

[0013] Further, the nozzle assembly includes: a wire tying seat. The lower end of the hollow guide shaft is connected with the wire tying seat. The wire tying seat is connected with a nozzle connecting plate through a heat insulation plate. A nozzle and a heating pipe are provided on the nozzle connecting plate, and the hollow guide shaft is communicated with the nozzle.

[0014] Further, a slip ring is sleeved on the lower rotating shaft, and the slip ring is installed on the rotating shaft mounting seat through a slip ring limiting block.

[0015] An adjustment method for a head sticking device with pneumatic pressure control is applicable to a head sticking device with pneumatic pressure control described in any one of the above, and includes the following steps.

[0016] S1. The tracheal joint inputs air pressure into the closed cavity through an electro-pneumatic proportional valve, pushes the airbag diaphragm and the piston to move downward, drives the hollow guide shaft to move axially, and adjusts the contact pressure of the nozzle.

[0017] S2. The driving motor drives the upper rotating shaft to rotate through a coupling, driving the lower rotating shaft and the nozzle assembly to rotate synchronously to achieve precise positioning;

[0018] S3. The vacuum joint provides negative pressure to the nozzle through the hollow guide shaft to adsorb the workpiece;

[0019] S4. The air pressure change in the closed cavity is fed back to the electro-pneumatic proportional valve in real time to dynamically adjust the downward pressure;

[0020] S5. The heating pipe heats the nozzle, and the temperature sensor monitors and maintains the set temperature.

[0021] Advantageous effects:

[0022] This application solves the problem that the traditional spring mechanism relies on mechanical deformation to adjust the pressure, and is easily affected by spring fatigue, machining errors and surface unevenness, resulting in large pressure fluctuations and poor consistency. This solution adopts a pneumatic pressure component, dynamically adjusts the air pressure input through an electro-pneumatic proportional valve, and combines the flexible transmission of the airbag diaphragm and the piston to accurately convert the air pressure into linear displacement, so that the contact pressure of the nozzle follows the set value in real time. This application monitors the air pressure change through a pressure sensor, dynamically compensates for external interference, improves the stability of the fitting pressure, completely eliminates the pressure failure problem caused by spring deformation, and avoids workpiece damage caused by overpressure or underpressure. Description of the drawings

[0023] Figure 1 is the structural schematic diagram of the present invention;

[0024] Figure 2 is the cross-sectional view of the present invention;

[0025] Figure 3 is the control block diagram of the present invention.

[0026] The reference numerals are: nozzle assembly 100, wire tying seat 110, heat insulation plate 120, nozzle connecting plate 130, nozzle 140, heating pipe 150, slip ring 160, slip ring limit block 170, rotation positioning assembly 200, rotating shaft mounting seat 210, upper rotating shaft 220, lower rotating shaft 230, closed cavity 240, airbag diaphragm 250, piston 260, hollow guide shaft 270, guide shaft sleeve 280, airbag diaphragm pressing block 290, pneumatic pressure component 300, air pipe joint 310, first air passage 320, first through hole 330, first sealing ring 340, vacuum joint 350, second through hole 360, second sealing ring 370, third through hole 380, third sealing ring 390, intermediate spacer 3100, power device 400, driving motor 410, motor mounting seat 420, coupling 430. Detailed implementation manners

[0027] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

[0028] Example: As Figures 1 - 3As shown, a head pressing device for pneumatically controlling pressure includes: a rotary positioning assembly 200, on which a nozzle assembly 100 and a pneumatic pressure assembly 300 are provided. The rotary positioning assembly 200 includes: an upper rotary shaft 220, both the upper rotary shaft 220 and a lower rotary shaft 230 are installed on a rotary shaft mounting seat 210 through rotary bearings. A power device 400 for driving the upper rotary shaft 220 to rotate is provided on the rotary shaft mounting seat 210. The lower rotary shaft 230 is connected to the upper rotary shaft 220 by bolts. A closed cavity 240 is provided at the connection of the upper rotary shaft 220 and the lower rotary shaft 230. An airbag diaphragm 250 and a piston 260 are provided in the closed cavity 240. A hollow guide shaft 270 is coaxially provided on the piston 260. The hollow guide shaft 270 is installed in the lower rotary shaft 230 through a guide shaft sleeve 280. The hollow guide shaft 270 is connected to the nozzle assembly 100. The pneumatic pressure assembly 300 is communicated with the closed cavity 240 and the hollow guide shaft 270. The airbag diaphragm 250 is installed at the connection of the upper rotary shaft 220 and the lower rotary shaft 230 through an airbag diaphragm pressing block 290. The pneumatic pressure assembly 300 includes: a tracheal joint 310. A first air passage 320 and a first through hole 330 provided on the first air passage 320 are provided on the upper rotary shaft 220. Two first sealing rings 340 for sealing the first through hole 330 are provided between the upper rotary shaft 220 and the rotary shaft mounting seat 210. A tracheal joint 310 is provided on the rotary shaft mounting seat 210. The tracheal joint 310 is communicated with the first through hole 330. The first air passage 320 is communicated with the closed cavity 240. The pneumatic pressure assembly 300 further includes: a vacuum joint 350. A second through hole 360 is provided on the hollow guide shaft 270. A second sealing ring 370 for sealing the second through hole 360 is provided between the lower rotary shaft 230 and the hollow guide shaft 270. A vacuum joint 350 is provided on the rotary shaft mounting seat 210. The vacuum joint 350 is communicated with the second through hole 360. A third through hole 380 is provided on the lower rotary shaft 230. Two third sealing rings 390 are provided between the lower rotary shaft 230 and the rotary shaft mounting seat 210. An intermediate spacer 3100 for supporting the third sealing rings 390 is provided between the two third sealing rings 390. The power device 400 includes: a driving motor 410. The driving motor 410 is installed on the rotary shaft mounting seat 210 through a motor mounting seat 420. The driving motor 410 is connected to the upper rotary shaft 220 through a coupling 430. The motor mounting seat 420 is installed on the rotary shaft mounting seat 210 through a locking nut 440 sleeved on the upper rotary shaft 220.The nozzle assembly 100 includes: a wire tying base 110, the lower end of the hollow guiding shaft 270 is connected to the wire tying base 110, the wire tying base 110 is connected to the nozzle connecting plate 130 through a heat insulation plate 120, a nozzle 140 and a heating tube 150 are arranged on the nozzle connecting plate 130, and the hollow guiding shaft 270 communicates with the nozzle 140. A slip ring 160 is sleeved on the lower rotating shaft 230, and the slip ring 160 is installed on the rotating shaft mounting seat 210 through a slip ring limiting block 170.

[0029] Among them, the rotation positioning component 200 realizes the precise positioning and rotation functions of the nozzle component 100 through the coordinated movement of the upper rotation shaft 220 and the lower rotation shaft 230. Both the upper rotation shaft 220 and the lower rotation shaft 230 are installed on the rotation shaft mounting seat 210 through rotation bearings. The function of the rotation bearing is to support the rotation shaft and reduce the frictional resistance to ensure smooth rotation; the power device 400 drives the upper rotation shaft 220 to rotate through the drive motor 410 and the coupling 430. The core function of the power device 400 is to provide rotational power for the system and realize the stable installation of the drive motor 410 through the cooperation of the motor mounting seat 420 and the locking nut 440; the lower rotation shaft 230 is connected to the upper rotation shaft 220 by bolts, and a closed cavity 240 is formed at the connection between the two. An airbag diaphragm 250 and a piston 260 are installed in the closed cavity 240. The airbag diaphragm 250 is fixed by the airbag diaphragm pressing block 290, and its function is to convert air pressure into mechanical displacement and adjust the axial movement of the piston 260 in real time through air pressure changes; the hollow guide shaft 270 coaxially arranged on the piston 260 is installed in the lower rotation shaft 230 through the guide shaft sleeve 280. The axial movement of the hollow guide shaft 270 directly drives the lifting of the nozzle component 100, thereby precisely controlling the contact pressure of the nozzle 140; the pneumatic pressure control component 300 is connected to the closed cavity 240 through the pipe joint 310. The pipe joint 310 inputs air pressure into the closed cavity 240 through the first air passage 320 and the first through hole 330. The first sealing ring 340 is used to seal the first through hole 330 to ensure the stability of air pressure transmission; the vacuum joint 350 is connected to the hollow guide shaft 270 through the second through hole 360. The second sealing ring 370 seals the second through hole 360, so that the nozzle 140 obtains a stable negative pressure adsorption force through the hollow guide shaft 270; the third through hole 380 on the lower rotation shaft 230 is sealed and supported through the third sealing ring 390 and the intermediate spacer 3100 to further optimize the sealing performance of the air circuit system; the wire tying seat 110 of the nozzle component 100 is connected to the nozzle connecting plate 130 through the heat insulation plate 120. The function of the heat insulation plate 120 is to block the heat generated by the heating tube 150 from being transmitted to other components. The nozzle 140 installed on the nozzle connecting plate 130 is connected to the vacuum joint 350 through the hollow guide shaft 270 to realize the adsorption and release of the workpiece; the heating tube 150 is connected to the slip ring 160 through the temperature controller. The slip ring 160 is fixed on the rotation shaft mounting seat 210 through the slip ring limit block 170. The function of the slip ring 160 is to maintain the continuous electrical connection between the rotating component and the external circuit to ensure that the temperature of the heating tube 150 is controllable; the pneumatic pressure control component 300 dynamically adjusts the air pressure in the closed cavity 240 through the electro-pneumatic proportional valve. The air pressure pushes the airbag diaphragm 250 and the piston 260 to move axially, so that the hollow guide shaft 270 drives the contact pressure of the nozzle 140 to be consistent with the set value, thereby avoiding pressure fluctuations caused by inconsistent spring deformation or compression amount;The rotating shaft mounting base 210, as the core support structure, ensures the airtightness of the air circuit system through the cooperation of each sealing ring 340, 370, 390 and the intermediate spacer 3100. At the same time, through the fixation of the rotating bearing and the locking nut 440, the stability of the rotating shaft operation is guaranteed; the cooperation between the hollow guide shaft 270 and the guide shaft sleeve 280 not only transmits the axial pressure, but also realizes the torque transmission through the spline structure, so that the nozzle assembly 100 rotates synchronously with the rotating shaft; the airbag diaphragm pressing block 290 fixes the airbag diaphragm 250 by mechanical pressing to prevent its displacement deviation caused by air pressure fluctuations; the coupling 430, as the connecting component between the driving motor 410 and the upper rotating shaft 220, effectively transmits the power and compensates for the shafting error; the combined design of the heat insulation plate 120 and the slip ring 160 solves the problems of heat transfer and electrical connection during the rotating heating process; the temperature sensor monitors the temperature of the heating tube 150 in real time and feeds the signal back to the temperature controller to form a closed-loop control, ensuring that the working temperature of the nozzle 140 is stably within the set range; the vacuum joint 350 and the air pipe joint 310 control the adsorption and pressure regulation functions respectively through independent air circuits, realizing the modularization of the system functions; each sealing ring 340, 370, 390 and the intermediate spacer 3100 effectively isolate the interference between different air circuits through a multi-layer sealing design, improving the system reliability; the wire tying base 110 fixes the cables through a structured layout to avoid cable entanglement during rotation; the heating tube 150 directly heats the nozzle connecting plate 130, so that the nozzle 140 maintains an appropriate temperature during the fitting process, improving the bonding effect between the reinforcing material and the FPC; the driving motor 410 cooperates with the rotating shaft through a high-precision coupling 430 to ensure that the rotation positioning accuracy of the nozzle assembly 100 reaches the micron level; the flexible characteristic of the airbag diaphragm 250 enables it to evenly transmit the air pressure to the piston 260, avoiding component damage caused by local stress concentration; the internal air circuit design of the hollow guide shaft 270 realizes the integration of the vacuum adsorption and air pressure regulation functions, simplifying the structural complexity; the modular design of the rotating shaft mounting base 210 is convenient for disassembly and maintenance, improving the maintainability of the equipment; the slip ring limit block 170 prevents the slip ring 160 from shifting during high-speed rotation through mechanical limitation, ensuring the stability of the electrical connection; the intermediate spacer 3100 provides rigid support between the third sealing rings 390 to prevent the sealing rings from deforming and failing due to air pressure impact; the locking nut 440 fixes the motor mounting base 420 by thread locking to ensure the connection rigidity between the driving motor 410 and the rotating shaft mounting base 210; the end shape of the nozzle 140 is customized according to the workpiece characteristics, which can be adapted to different sizes and materials of reinforcing patches, improving the versatility of the equipment; the electro-pneumatic proportional valve precisely controls the air pressure output through a voltage signal, realizing stepless adjustment and closed-loop feedback of the head pressure, and completely solving the stability defect of the traditional spring pressure mechanism.;

[0030] A regulating method for a head pressing device with pneumatic control of pressure, applicable to the head pressing device with pneumatic control of pressure described in any one of the above, includes the following steps.

[0031] S1. The air pipe joint 310 inputs air pressure into the closed cavity 240 through the electro-pneumatic proportional valve, pushing the airbag diaphragm 250 and the piston 260 to move downward, driving the hollow guide shaft 270 to move axially, and regulating the contact pressure of the suction nozzle 140. Specifically, the electro-pneumatic proportional valve is started, and the set air pressure is input into the closed cavity 240 through the air pipe joint 310. The air pressure enters the closed cavity 240 through the first air passage 320 and the first air through hole 330. The first sealing ring 340 dynamically seals the first air through hole 330 to ensure no air leakage in the air path. The input air pressure pushes the airbag diaphragm 250 to deform downward. The airbag diaphragm 250 is fixed at the connection between the upper rotating shaft 220 and the lower rotating shaft 230 through the airbag diaphragm pressing block 290, and its flexible characteristic evenly transmits the air pressure to the piston 260. The piston 260 is driven by the air pressure to move downward axially, driving the coaxial hollow guide shaft 270 to axially move in the lower rotating shaft 230 through the guide shaft sleeve 280. The displacement of the hollow guide shaft 270 is transmitted to the suction nozzle 140 through the suction nozzle connecting plate 130, thereby accurately regulating the downward pressure of the suction nozzle 140 in contact with the workpiece. The air pressure value is adjusted in real time through the voltage signal of the electro-pneumatic proportional valve to keep the downward pressure consistent with the set value, avoiding pressure fluctuations caused by uneven workpiece surfaces or differences in the downward pressing stroke.

[0032] S2. The driving motor 410 drives the upper rotating shaft 220 to rotate through the coupling 430, driving the lower rotating shaft 230 and the suction nozzle assembly 100 to rotate synchronously to achieve precise positioning. Specifically, the driving motor 410 drives the upper rotating shaft 220 to rotate through the coupling 430. The motor mounting seat 420 is fixed on the rotating shaft mounting seat 210 through the locking nut 440 to ensure that the coaxiality error between the driving motor 410 and the upper rotating shaft 220 is less than 0.01 mm. The upper rotating shaft 220 is rigidly connected to the lower rotating shaft 230 through bolts, and the synchronous rotation of the two drives the entire suction nozzle assembly 100 to rotate 360° around the axis. The rotating bearings arranged in the rotating shaft mounting seat 210 provide low-friction support for the upper rotating shaft 220 and the lower rotating shaft 230, and torque transmission between the hollow guide shaft 270 and the lower rotating shaft 230 is achieved through the spline shaft sleeve to ensure that the suction nozzle 140 maintains a stable posture during rotation. The rotational positioning accuracy is closed-loop controlled by the encoder of the driving motor 410 to meet the precise alignment requirements of the FPC reinforcement sheet.

[0033] S3. The vacuum joint 350 provides negative pressure to the suction nozzle 140 through the hollow guide shaft 270 to adsorb the workpiece. Specifically, the vacuum joint 350 extracts the gas inside the hollow guide shaft 270 through the second air passage hole 360. The second sealing ring 370 seals the second air passage hole 360 to prevent negative pressure leakage. The negative pressure gas is transmitted to the suction nozzle 140 through the internal channel of the hollow guide shaft 270. The suction nozzle 140 generates a negative pressure area through the adsorption holes at its end to stably adsorb the reinforcement patch on the surface of the suction nozzle 140. During the adsorption process, the wire tying base 110 isolates the heat of the suction nozzle connecting plate 130 through the heat insulation plate 120 to avoid interference with the negative pressure air path caused by heat. The vacuum pressure value is adjusted by an external vacuum generator to ensure that the adsorption force is adjustable within the range of 5 - 20 kPa to adapt to reinforcement patches of different materials and thicknesses;

[0034] S4. The air pressure change in the closed cavity 240 is fed back to the electro-pneumatic proportional valve in real time to dynamically adjust the downward pressure. Specifically, the air pressure in the closed cavity 240 is monitored in real time by a pressure sensor and fed back to the electro-pneumatic proportional valve. When the suction nozzle 140 presses down to fit the reinforcement patch, the reaction force on the workpiece surface causes a slight displacement of the piston 260, resulting in a change in the volume of the closed cavity 240 and a corresponding fluctuation in air pressure. The electro-pneumatic proportional valve dynamically adjusts the input air pressure according to the feedback signal so that the displacement of the airbag diaphragm 250 and the piston 260 always matches the set pressure. For example, if the detected air pressure drops, the output air pressure of the electro-pneumatic proportional valve is increased to push the piston 260 to supplement the downward pressure; if the air pressure is too high, the output air pressure is reduced to prevent overpressure from damaging the workpiece. This closed-loop control makes the fitting pressure highly stable and completely solves the problem of pressure failure caused by deformation or fatigue of the traditional spring mechanism;

[0035] S5. The heating tube 150 heats the suction nozzle 140, and the temperature sensor monitors and maintains the set temperature. Specifically, the temperature controller is started, and power is supplied to the heating tube 150 through the slip ring 160. The slip ring 160 is fixed on the rotating shaft mounting seat 210 through the slip ring limit block 170 to ensure continuous connection between the heating tube 150 and the external circuit during rotation. The heating tube 150 is embedded inside the suction nozzle connecting plate 130 to directly heat the suction nozzle 140. The temperature sensor monitors the temperature of the suction nozzle 140 in real time and feeds the data back to the temperature controller. When the temperature is lower than the set value, the temperature controller increases the heating power; when the temperature exceeds the set upper limit, the power supply is cut off. The heat insulation plate 120 blocks the heat transfer to the wire tying base 110, the upper rotating shaft 220, and the lower rotating shaft 230 to prevent the slip ring 160 and the sealing ring from aging due to heat. The heating temperature can be precisely controlled to ensure that the adhesive layer of the reinforcement patch reaches the best activation state during fitting, improving the bonding strength.

[0036] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A head - attaching device for pneumatically controlled pressure regulation, comprising: Rotating positioning assembly (200), on which a nozzle assembly (100) and a pneumatic pressure assembly (300) are provided. It is characterized in that the rotating positioning assembly (200) includes: an upper rotating shaft (220), both the upper rotating shaft (220) and the lower rotating shaft (230) are installed on a rotating shaft mounting seat (210) through rotating bearings, a power device (400) for driving the rotation of the upper rotating shaft (220) is provided on the rotating shaft mounting seat (210), the lower rotating shaft (230) is connected to the upper rotating shaft (220) by bolts, a closed cavity (240) is provided at the connection of the upper rotating shaft (220) and the lower rotating shaft (230), an airbag diaphragm (250) and a piston (260) are provided in the closed cavity (240), a hollow guide shaft (270) is coaxially provided on the piston (260), the hollow guide shaft (270) is installed in the lower rotating shaft (230) through a guide shaft sleeve (280), the hollow guide shaft (270) is connected to the nozzle assembly (100), and the pneumatic pressure assembly (300) is communicated with the closed cavity (240) and the hollow guide shaft (270).

2. The head attaching device for pneumatically controlling and adjusting pressure according to claim 1, wherein, The airbag diaphragm (250) is installed at the connection of the upper rotating shaft (220) and the lower rotating shaft (230) through an airbag diaphragm pressing block (290).

3. The head attaching device for pneumatically controlling and adjusting pressure according to claim 1, wherein The pneumatic pressure assembly (300) includes: a tracheal joint (310), a first air passage (320) is provided on the upper rotating shaft (220) and a first through hole (330) is provided on the first air passage (320), two first sealing rings (340) for sealing the first through hole (330) are provided between the upper rotating shaft (220) and the rotating shaft mounting seat (210), a tracheal joint (310) is provided on the rotating shaft mounting seat (210), the tracheal joint (310) is communicated with the first through hole (330), and the first air passage (320) is communicated with the closed cavity (240).

4. The head attaching device for pneumatically controlling and adjusting pressure according to claim 1, wherein, The pneumatic pressure assembly (300) further includes: a vacuum joint (350), a second through hole (360) is provided on the hollow guide shaft (270), a second sealing ring (370) for sealing the second through hole (360) is provided between the lower rotating shaft (230) and the hollow guide shaft (270), a vacuum joint (350) is provided on the rotating shaft mounting seat (210), and the vacuum joint (350) is communicated with the second through hole (360).

5. The head attachment device for pneumatically controlled pressure regulation according to claim 4, characterized in that, A third through hole (380) is provided on the lower rotating shaft (230), two third sealing rings (390) are provided between the lower rotating shaft (230) and the rotating shaft mounting seat (210), and an intermediate spacer sleeve (3100) for supporting the third sealing rings (390) is provided between the two third sealing rings (390).

6. The head attaching device for pneumatically controlled pressure adjustment according to claim 1, characterized in that, The power device (400) includes: a drive motor (410), which is mounted on the rotary shaft mounting seat (210) through a motor mounting seat (420), and the drive motor (410) is connected to the upper rotary shaft (220) through a coupling (430).

7. The head-attaching device for pneumatic control of pressure according to claim 1, characterized in that, The motor mounting seat (420) is mounted on the rotary shaft mounting seat (210) through a lock nut (440) sleeved on the upper rotary shaft (220).

8. The head attaching device for pneumatically controlled pressure adjustment according to claim 1, characterized in that, The nozzle assembly (100) includes: a wire tying seat (110), the lower end of the hollow guide shaft (270) is connected to the wire tying seat (110), the wire tying seat (110) is connected to a nozzle connecting plate (130) through a heat insulation plate (120), a nozzle (140) and a heating pipe (150) are arranged on the nozzle connecting plate (130), and the hollow guide shaft (270) communicates with the nozzle (140).

9. The head attaching device for pneumatic control of pressure according to claim 8, characterized in that, A slip ring (160) is sleeved on the lower rotary shaft (230), and the slip ring (160) is mounted on the rotary shaft mounting seat (210) through a slip ring limit block (170).

10. A regulating method for a head attaching device with pneumatic control of pressure, applicable to a head attaching device with pneumatic control of pressure according to any one of claims 1-9, characterized in that, It includes the following steps S1. The air pipe joint (310) inputs air pressure into the closed cavity (240) through an electro-pneumatic proportional valve, pushes the airbag diaphragm (250) and the piston (260) to move downward, drives the hollow guide shaft (270) to move axially, and adjusts the contact pressure of the nozzle (140). S2. The drive motor (410) drives the upper rotary shaft (220) to rotate through the coupling (430), drives the lower rotary shaft (230) and the nozzle assembly (100) to rotate synchronously, and realizes precise positioning. S3. The vacuum joint (350) provides negative pressure to the nozzle (140) through the hollow guide shaft (270) to adsorb the workpiece. S4. The air pressure change in the closed cavity (240) is fed back to the electro-pneumatic proportional valve in real time to dynamically adjust the downward pressure. S5. The heating pipe (150) heats the nozzle (140), and the temperature sensor monitors and maintains the set temperature.

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