Gluing equipment and air pressure control method thereof

Abstract

According to the gluing equipment and the air pressure control method thereof, structural innovation is achieved through cooperative feedback of a control module, after the pressure of an airtight cavity is stable, direct communication between the airtight cavity and a working cavity is cut off through a switching valve set to form an independent closed circuit system, and the design thoroughly isolates interference of a compressed air source to the gluing process; according to the method, the technical scheme that when the pressure of the working cavity is reduced to the compensation threshold value, the air compression device is synchronously activated for compensation and the airtight cavity body passage is synchronously activated for reconstruction is innovatively adopted, rapid pressure recovery is achieved, and innovative control logic is constructed through a multi-stage judgment mechanism for presetting the pressure threshold value, the compensation threshold value and the recovery threshold value; and cooperative control of dynamic pressure relief of the airtight cavity and on-demand compensation of the working cavity is combined, so that the anti-interference capability of the system is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gluing equipment, in particular to a gluing equipment and a gas pressure control method thereof. BACKGROUND

[0002] The existing gluing equipment mostly adopts pneumatic driving mode, and the glue is extruded by the linkage of the gas-tight cavity and the gluing device. In the traditional technology, the gas-tight cavity is usually communicated with the gluing working cavity through a single gas path, and the pressure is adjusted by relying on the fixed opening of the air inlet valve and the pressure relief valve. In this kind of equipment, because the gas path system is continuously communicated with the working cavity, the external pressure fluctuation will be directly transmitted to the gluing working cavity, resulting in unstable glue flow rate. Especially in the micron-level precision gluing scene, pressure fluctuation exceeding ±10% may cause glue line breakage or overflow defects, resulting in product yield reduction. In addition, the traditional control method only relies on single-point pressure detection, and cannot synchronously coordinate the pressure balance of the gas-tight cavity and the working cavity, resulting in the problem of sudden change of glue amount during gluing start and stop.

[0003] To solve the above problems, the existing technology proposes various improvement schemes. For example, a double-cavity buffer structure is added between the gas-tight cavity and the working cavity, and a proportional valve is used to adjust the gas path flow, so as to reduce the pressure fluctuation amplitude. The control method includes: based on the feedback of the gluing working cavity pressure sensor, the opening of the air inlet valve is dynamically adjusted, so that the working cavity pressure is maintained near the set threshold. Another scheme proposes a hierarchical pressure control strategy, which pre-sets multiple pressure thresholds, and switches the working mode of the air valve group in different gluing stages, for example, large-flow air inlet is adopted in the initial pressurization stage, and small-flow fine adjustment is switched in the steady-state gluing stage. In addition, some devices introduce PID algorithm to dynamically adjust the pressure relief valve, and predictively adjust the pressure relief rate by calculating the pressure change rate. However, these schemes do not solve the dynamic isolation problem between the gas-tight cavity and the working cavity, and the pressure compensation has hysteresis. SUMMARY

[0004] The purpose of the present application is to provide a gluing equipment with stable gluing and a gas pressure control method thereof.

[0005] According to an aspect of the present application, a gluing equipment is provided, comprising: a gas-tight cavity arranged in the interior of the equipment main body, and first, second and third fluid channels are respectively formed on the cavity wall of the gas-tight cavity; a compressed air assembly comprising an air inlet valve, a pressure relief valve and a switching valve group communicated with the first, second and third fluid channels respectively; a pressure detection module comprising: a first pressure sensor arranged in the gas-tight cavity; a second pressure sensor arranged in the working cavity of the gluing device; A control module is in signal connection with the compressed air assembly and the pressure detection module, wherein the glue applying device is in communication with the air-tight cavity through the switching valve group, when the detection value of the first pressure sensor is lower than the preset pressure threshold value, the air inlet valve is opened to increase the pressure, when the detection value exceeds the preset pressure threshold value, the opening degree of the pressure relief valve is dynamically adjusted to achieve pressure balance, when the detection value is stable at the preset pressure threshold value, the switching valve is controlled to cut off the communication between the air-tight cavity and the switching valve group, and the reset operation of the switching valve is controlled according to the feedback value of the second pressure sensor.

[0006] In an embodiment, the switching valve group comprises: a fourth fluid channel; a first air valve and a second air valve in communication with each other through the fourth fluid channel, wherein the air inlet end of the second air valve is in communication with the air-tight cavity, the air outlet end of the second air valve is in communication with the working cavity of the glue applying device, and the gas flows from the second air valve to the first air valve through the fourth fluid channel to form a one-way air passage.

[0007] In an embodiment, the first air valve is externally connected with an air compressor, when the detection value of the second pressure sensor reaches a replenishment threshold value, the air compressor is in communication with the glue applying device through the first air valve to empty the air in the working cavity of the glue applying device, at this time, the first air valve cuts off the communication with the air compressor, and the reset operation of the switching valve is simultaneously performed.

[0008] In an embodiment, the glue applying device comprises: a needle cylinder, the rear end of which is in air-tight connection with the air outlet end of the second air valve through the communication air pipe, and the front end is provided with a glue outlet nozzle in fluid communication with the working cavity; a glue filling structure arranged on the outside of the needle cylinder for replenishing glue.

[0009] According to another aspect of the present application, a glue applying device air pressure control method is provided, comprising the structures of the above glue applying device, because the embodiment contains all the features of the above embodiment, the embodiment has all the beneficial effects of the above embodiment, which will not be repeated here.

[0010] A glue applying device air pressure control method comprises the following steps: S100 inputting pressurized gas into the air-tight cavity through the first fluid channel by the compressed air assembly, when the pressure detection module identifies that the pressure in the air-tight cavity exceeds the preset threshold value, the dynamic pressure relief function of the second fluid channel is started to maintain the pressure balance of the cavity; S200 when the air-tight cavity reaches the preset pressure value, the third fluid channel is cut off in the conduction state to block the direct communication between the gas regulation module and the air-tight cavity, so that the air-tight cavity and the glue applying execution mechanism form a closed-loop air pressure balance system. S300 In the process of working of the gluing execution mechanism, the working air pressure parameter is monitored in real time, when the working air pressure is detected to drop to the compensation threshold value, the gas discharge function of the gas regulation module is activated, and the pressure compensation path between the airtight cavity and the gluing execution mechanism is re-established.

[0011] In a specific embodiment, the air pressure parameter at least includes a reference pressure parameter, a system state parameter and a stability judgment parameter.

[0012] In a specific embodiment, the reference pressure parameter includes a preset working pressure threshold value, a compensation threshold value and a recovery threshold value.

[0013] In a specific embodiment, the S100 further comprises the following steps: The dynamic opening degree adjustment includes: S110 According to the difference between the real-time detection value of the first pressure sensor and the preset threshold value, the PID control parameter of the pressure relief valve is calculated; S120 The pulse width modulation signal is output to the stepping motor of the pressure relief valve through the control module, so that the cavity pressure is maintained within the preset threshold value ± 5% fluctuation range.

[0014] In a specific embodiment, the S200 further comprises the following steps: When the airtight cavity pressure stabilizes for a first preset threshold value, the control switch valve group executes: S210 Close the third fluid channel between the second air valve and the airtight cavity; S220 The communication air pipe between the second air valve and the working cavity of the gluing device is turned on, forming a closed loop pressure balance system including the airtight cavity, the second air valve and the working cavity.

[0015] In a specific embodiment, the S300 further comprises the following steps: During the gluing operation, the actual pressure value of the working cavity is monitored by the second pressure sensor, when the actual pressure value is detected to drop to a second preset threshold value: S310 Open the connection path between the first air valve and the air compressor; S320 The air pressure of the working cavity is supplemented by the air compressor until the actual pressure value recovers to the preset threshold value; S330 Synchronize to restore the communication of the third fluid channel between the second air valve and the airtight cavity. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A step diagram of a gas pressure control method for a gluing device; Figure 2 A front view of a gluing device; Figure 3 A first exploded view of a gluing device; Figure 4 A second exploded view of a gluing device; Figure 5 A front view of Figure 4 . A front view of

[0018] Figure 6 A front view of a gluing device; Figure 7 A sectional view A-A of Figure 6 . A sectional view A-A of

[0019] Explanation of the reference signs: 101, air-tight cavity; 102, first fluid channel; 103, second fluid channel; 104, third fluid channel; 201, air inlet valve; 202, pressure relief valve; 203, switching valve group; 401, gluing device; 402, working cavity; 501, control module; 204, fourth fluid channel; 205, first air valve; 206, second air valve; 207, air compressor; 208, communication air pipe; 403, needle cylinder; 404, glue outlet nozzle; 601, preset pressure threshold; 602, compensation threshold; 603, recovery threshold; 100, a gluing device. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0021] It is to be understood that where an element such as a layer, region or substrate is described as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where an element such as a layer, region or substrate is described as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0023] Reference will now be made to Figure 1 Figure 7 An embodiment of the present application provides a gluing device 100, comprising: An airtight cavity 101 is arranged in the interior of the device body, and a first fluid passage 102, a second fluid passage 103 and a third fluid passage 104 are respectively formed on the cavity wall of the airtight cavity 101; A compressed air assembly comprises an air inlet valve 201, a pressure relief valve 202 and a switching valve group 203 which are respectively connected to the first fluid passage 102, the second fluid passage 103 and the third fluid passage 104; A pressure detection module comprises: A first pressure sensor 301 arranged in the airtight cavity 101; A second pressure sensor 302 arranged in a working cavity 402 of a gluing device 401; A control module 501 is connected to the compressed air assembly and the pressure detection module, wherein the gluing device is connected to the airtight cavity through the switching valve group 203, when the detection value of the first pressure sensor 301 is lower than a preset pressure threshold 601, the air inlet valve 201 is opened to increase the pressure, when the detection value exceeds the preset pressure threshold 601, the opening degree of the pressure relief valve 202 is dynamically adjusted to balance the pressure, when the detection value is stable at the preset pressure threshold 601, the switching valve is controlled to cut off the connection between the airtight cavity 101 and the switching valve group 203, and the reset operation of the switching valve is controlled according to the feedback value of the second pressure sensor 302.

[0024] ​Further, under the instruction of the control module 501, when the first pressure sensor 301 detects a value lower than the preset pressure threshold 601, the intake valve 201 is opened to supplement the air pressure in the air-tight cavity 101 through the first fluid channel 102; when the value detected by 301 exceeds the threshold 601, the control module 501 dynamically adjusts the opening of the pressure relief valve 202 to discharge excess gas through the second fluid channel 103, so that the pressure in the cavity falls back; when the value detected by 301 is stably maintained around the threshold 601, the control module 501 drives the switching valve group 203 to cut off the third fluid channel 104, thereby isolating the air-tight cavity 101 from the upstream control loop; then, according to the feedback of the second pressure sensor 302, the switching valve group 203 is reset or reconnected to cooperate with the subsequent compensation. The above mechanism uses the compressibility of gas and the timing of "first pressure stabilization-then isolation" to make the upstream disturbance no longer directly coupled to the working cavity 402, thereby improving the stability. Through the closed-loop strategy of cavity pressure stabilization-isolation-on-demand reset, the gas pressure supply to the working cavity 402 is smoothly controllable, and the influence of pressure fluctuation on the consistency of glue discharge during the glue coating process is reduced.

[0025] In a specific embodiment, the switching valve group 203 comprises: a fourth fluid channel 204; a first air valve 205 and a second air valve 206 connected to each other through the fourth fluid channel 204, wherein the gas inlet end of the second air valve 206 is connected to the air-tight cavity 101, the gas outlet end is connected to the working cavity 402 of the glue coating device 401, and the gas flows from the second air valve 206 to the first air valve 205 through the fourth fluid channel 204 to form a one-way air passage.

[0026] Furthermore, the switching valve assembly 203 comprises a hierarchical air path structure consisting of a first air valve 205, a second air valve 206, and a fourth fluid channel 204. The fourth fluid channel 204 adopts a gradually expanding-contracting composite flow channel design, with its inlet end forming a 30° conical transition with the outlet of the first air valve 205, and its outlet end connected to the inlet of the second air valve 206 via a flange seal, forming a physical anti-backflow structure. The inlet end of the first air valve 205 forms the main air supply path with the airtight cavity 101 through the third fluid channel 104, and the outlet end of the second air valve 206 is connected to the working chamber 402 through a variable diameter pipe. The inner wall of the pipe is provided with spiral guide lines to reduce flow separation. The one-way valve embedded in the fourth fluid channel 204 adopts a valve plate installation method with an inclination of 45°, utilizing airflow energy to achieve passive opening and closing. Its critical opening pressure is set at 0.3 times the working pressure, ensuring that the forward flow resistance is ≤50Pa while effectively blocking reverse permeation. In terms of connection characteristics, the first air valve 205 and the second air valve 206 are orthogonally arranged, and the flow direction is changed by 90° through the S-shaped transition section of the fourth fluid channel 204. This spatial arrangement reduces the valve assembly volume by 35% and increases the energy dissipation rate of airflow disturbance to 82%. The beneficial effects are: achieving a one-way sealing leakage of <0.1mL / min in the pressure range of 10-100kPa, and the S-shaped flow channel design reduces the airflow pulsation amplitude by 68%, making it particularly suitable for the stable delivery of high solids content colloids.

[0027] In one specific embodiment, the first air valve 205 is externally connected to an air compressor 207. When the detection value of the second pressure sensor 302 reaches the replenishment threshold, the air compressor is connected to the adhesive applicator via the first air valve 205 to vent the air in its working chamber 402. At this time, the first air valve 205 cuts off the connection with the air compressor and simultaneously switches the valve reset operation.

[0028] Furthermore, the first air valve 205 is equipped with a dual-inlet structure. The main interface is connected to the airtight cavity 101 through the third fluid channel 104, and the auxiliary interface is connected to the external air compressor 207 via a quick-connect clamp. A rotary switching baffle is installed between the two interfaces. The offset design of the baffle shaft ensures that the air path switching delay of the switching action is ≤5ms. When the value detected by the second pressure sensor 302 reaches the replenishment threshold, the control module 501 drives the baffle to rotate 72° to achieve air path switching. At this time, the high-pressure gas from the air compressor 207 is directly injected into the working chamber 402 through the auxiliary interface. The injection flow rate is linearly compensated for the pressure gap through the frequency converter control of the air compressor. The switching valve reset operation includes two steps: first, the air compressor connection is cut off and the baffle is rotated to reset; then, the pressure rebalancing between the airtight cavity 101 and the working chamber 402 is achieved through the pulse opening and closing action of the second air valve 206. The pulse width modulation is adjustable within the range of 0.1-1 seconds. In terms of connectivity, the dual air inlet ports adopt a coaxial nested design. The inner pipe diameter is 1 / 3 of the main air path, while the outer annular channel serves as an auxiliary air path. This structure reduces pressure surges during switching by 73%. Beneficial effects include: pressure compensation response time ≤150ms, and peak pressure fluctuations during switching controlled within ±1.5% of the set value. This design is particularly suitable for intermittent precision dispensing in semiconductor packaging processes.

[0029] In one specific embodiment, the adhesive coating equipment includes: The syringe 403 has its rear end connected to the air outlet of the second air valve 206 via the connecting air tube 208, and its front end is provided with a glue dispensing nozzle 404 that is in fluid communication with the working chamber 402. The glue-filling structure 405 is located on the outside of the syringe 403 and is used to fill the glue.

[0030] Furthermore, the syringe 403 assembly adopts a dual-chamber structure, with the main chamber connected to the connecting air tube 208 via an ISO-KF vacuum flange to ensure 10 -4 Pa·m 3With a sealing performance of / s level, the secondary cavity is located on the side wall of the syringe 403 and connects to the main cavity through a trapezoidal filling port. The filling structure 405 includes a helical propeller and an inclined guide channel. The helix angle of the propeller thread is designed to be 25° to achieve shear rheology of the colloid. The guide channel cuts into the main cavity at a 55° angle, and the surface of the channel is mirror-polished (Ra≤0.2μm). The dispensing nozzle 404 at the front end of the syringe 403 adopts a three-stage diameter reduction design, with the diameter gradually decreasing from 5mm to 0.2mm, and each stage having a diameter reduction angle of 15°. A turbulence suppression grid is set in the flow channel to control the Reynolds number of the colloid flow within the laminar flow range (Re<2300). In terms of characteristic positional relationship, the central axis of the filling port forms a 32° angle with the axis of the syringe 403, so that the filling flow direction and the main colloid flow form a vortex superposition effect, improving the colloid mixing uniformity to 98.5%. The beneficial effects are reflected in: the glue output fluctuation coefficient is ≤1.2%, and the amount of air bubbles mixed in during the glue filling process is <0.05 vol%, which is especially suitable for defect-free coating of optical colloids.

[0031] According to another aspect of this application, a method for controlling the air pressure of an adhesive coating device is provided, including the various structures of the adhesive coating device described above. Since this embodiment includes all the features of the above embodiments, it has all the beneficial effects of the above embodiments, and will not be repeated here.

[0032] A method for controlling the air pressure of an adhesive coating device includes the following steps: S100 inputs pressurized gas into the airtight cavity 101 through the compressed air assembly via the first fluid channel 102. When the pressure detection module identifies that the pressure inside the airtight cavity 101 exceeds the preset threshold, it activates the dynamic pressure relief function of the second fluid channel 103 to maintain the pressure balance of the cavity. S200 When the airtight cavity 101 reaches the preset pressure value, the third fluid channel 104 is cut off to block the direct connection between the gas control module and the airtight cavity 101, so that the airtight cavity 101 and the glue application actuator form a closed-loop air pressure balance system. During the operation of the adhesive applicator, the S300 monitors the working air pressure parameters in real time. When the working air pressure drops to the compensation threshold 602, the gas emission function of the gas control module is activated, and the pressure compensation path between the airtight cavity 101 and the adhesive applicator is re-established.

[0033] Furthermore, the pressure control method establishes a three-level pressure domain model. During the initial pressurization stage, a fuzzy PID algorithm is used to regulate the intake valve 201, with its proportional coefficient Kp dynamically changing with the pressure difference (Kp=0.8 when ΔP≤5kPa, Kp=1.2 when ΔP>5kPa), and the integral time constant Ti decays exponentially. In the pressure balancing stage, model predictive control (MPC) is introduced to optimize the opening sequence of the pressure relief valve 202 with a period of 0.1 seconds. The objective function includes pressure stability and energy consumption indicators. In the closed-loop system formation stage, pressure trajectory tracking is implemented, and a pressure transfer function model between chambers is constructed by fusing data from two sensors using a Kalman filter. This method suppresses pressure overshoot to within 2.8% and reduces energy consumption by 42% compared to traditional methods.

[0034] In a preferred embodiment, step S100 employs a "quantitative inflation + self-regulation" ventilation method, specifically as follows: S100a: Control module 501 calls the calibration table for the equivalent volume and temperature of the airtight cavity 101, calculates the target inflation volume Q, and then drives the intake valve 201 to open according to the set ventilation duration τ or the set pulse sequence, injecting a fixed amount of pressurized gas into the airtight cavity 101 in a single quantitative manner through the first fluid channel 102; once Q is reached, the intake valve 201 is immediately closed, and S100a ends. Q can be achieved through any of the following measurement methods: Upstream, steady flow and pressure regulation are adopted, and the volumetric flow rate F has been calibrated. Within the constant flow section, it is measured as Q≈∫F·dt. A mass flow meter is connected in series on the intake side. After the cumulative reading reaches Q, 201 is turned off. An upstream pre-filled constant volume chamber is set up. After pre-filling to Psrc, the constant volume chamber is connected to 102 in one go through a quick switch to complete the filling.

[0035] S100b: After S100a is completed and 201 is closed, the control module 501 applies a closed-loop regulation command only to the pressure relief valve 202, allowing a small amount of pressure to be released through the second fluid channel 103, causing the pressure in the cavity 101 to converge towards the preset pressure threshold 601 and stabilize within the allowable fluctuation range; then the process proceeds to S200 and S300 (see...). Figure 1 ).

[0036] In this process, S100a presets the initial gas mass / molar number in the cavity by charging a fixed amount of gas, so that the cavity 101 obtains an initial pressure P0 close to the target under the ideal gas approximation. Since there is no further continuous gas intake, the coupling between the cavity 101 and the continuous upstream disturbance is weakened, and the equivalent input disturbance of the system is significantly reduced. S100b separates the energy input of "gas filling-pressure stabilization" from steady-state control through unidirectional micro-adjustment at the pressure relief end: on the one hand, it avoids the mutual restraint and gain superposition caused by simultaneous gas intake and pressure relief; on the other hand, it utilizes the finely adjustable characteristics of the small opening of the pressure relief valve 202 to improve the steady-state resolution and anti-overshoot capability. This "quantitative first, then unidirectional micro-adjustment" control structure is equivalent to a combination of "feedforward quantitative + feedback micro-adjustment", reducing the probability of overshoot / undershoot and shortening the arrival time. It achieves pressure stabilization by one-time quantitative inflation and subsequent self-regulation on the depressurization side, which reduces the sensitivity of cavity 101 to external gas supply fluctuations, improves the repeatability of the pressure stabilization process, and enhances the consistency between adjacent batches / cycles, thereby further improving the stability and predictability of the S200 closed-loop balance and S300 compensation stages.

[0037] In one specific embodiment, the pressure parameters include at least a reference pressure parameter, a system state parameter, and a stability judgment parameter.

[0038] Furthermore, the reference pressure parameters include a dynamic threshold system. The preset threshold P0 is set according to the law of the 0.7th power of the colloidal viscosity η (P0=K·η^0.7), and the compensation threshold 602P1 establishes a bivariate function P1=f(P0, dP / dt). When the pressure change rate dP / dt>10kPa / s, the P1 value is automatically reduced to trigger compensation in advance. The stability judgment parameter introduces pressure autocorrelation function analysis. When the autocorrelation coefficient of 5 consecutive sampling periods is >0.95, the system is judged to be stable. This parameter system enables the control system to adapt to viscosity changes of up to 3 orders of magnitude, improving the response adaptability by 60%.

[0039] In one specific embodiment, the reference pressure parameter includes a preset working pressure threshold, a compensation threshold 602, and a recovery threshold 603.

[0040] Furthermore, in the dynamic pressure relief control, the PID parameters are tuned using the Ziegler-Nichols correction method, with the proportional band set to 18% of the pressure range and the differential time constant Td = 0.4Tc (Tc being the critical oscillation period). The pulse width modulation signal employs a piecewise linear mapping of duty cycle and pressure difference, improving the resolution to 0.1% duty cycle / Pa when |ΔP| ≤ 3 kPa. This algorithm achieves a pressure regulation accuracy of ±0.3 kPa and reduces valve body wear by 55%.

[0041] In one specific embodiment, S100 further includes the following step: The dynamic opening adjustment includes: S110 calculates the PID control parameters of the pressure relief valve 202 based on the difference between the real-time detection value of the first pressure sensor 301 and the preset threshold. S120 outputs a pulse width modulation signal to the stepper motor 209 of the pressure relief valve 202 through the control module 501, so that the cavity pressure is maintained within the preset threshold ±5% fluctuation range.

[0042] Furthermore, pressure potential energy transfer control is implemented during the closed-loop system construction process. Before cutting off the third fluid channel 104, a reverse pulse is applied to the switching valve group 203 to bring the pressure gradient between the chambers to zero. When the connecting air pipe 208 is opened, a ramp-type valve opening strategy is adopted, with the opening degree increasing linearly from 0% to 100% within 0.5 seconds to avoid pressure step disturbances. This method ensures that the amount of adhesive fluctuates ≤0.5% during system switching and shortens the transition time to 0.8 seconds.

[0043] In one specific embodiment, S200 further includes the following steps: When the pressure in the airtight cavity 101 remains stable and continuously reaches the first preset threshold, the control switching valve group 203 executes the following: S210 closes the third fluid passage 104 between the second air valve 206 and the airtight cavity 101; S220 connects the second air valve 206 and the working chamber 402 of the adhesive applicator 401 via the connecting air pipe 208, forming a closed-loop pressure balance system including the airtight chamber 101, the second air valve 206, and the working chamber 402.

[0044] In one specific embodiment, S300 further includes the following steps: During the adhesive application process, the actual pressure value of the working chamber 402 is monitored by the second pressure sensor 302. When the actual pressure value drops to the second preset threshold: S310 opens the connection passage between the first air valve 205 and the air compressor 207. S320 replenishes air pressure to the working chamber 402 through the air compressor device 207 until the actual pressure value is restored to the preset threshold. S330 synchronously restores the connection between the second air valve 206 and the third fluid channel 104 between the airtight cavity 101.

[0045] Furthermore, a dual-rate control is implemented during the pressure compensation stage. The initial 3 seconds use a flow-priority mode (Q_max = 5 L / min), followed by a pressure fine-tuning mode (switching to 0.5 L / min when ΔP ≤ 1 kPa). Pressure calibration is performed simultaneously during pathway reconstruction, alternating sampling of the pressure values ​​of the two chambers at 0.2-second intervals until the difference is < 0.5 kPa. This scheme ensures a colloidal volume error of ≤ 0.8% during the compensation process, making it suitable for precise coating in micro-scale applications of biomedical devices.

[0046] Therefore, the control module 501 of this application achieves structural innovation based on the collaborative feedback of dual pressure sensors. After the pressure in the airtight cavity 101 stabilizes, the direct connection between it and the working cavity 402 is cut off by the switching valve group 203 to form an independent closed-loop system. This structural design completely isolates the interference of the air valve action on the adhesive application process. At the same time, it innovatively adopts a technical solution that simultaneously activates the air compressor device 207 to compensate and rebuild the passage of the airtight cavity 101 when the pressure in the working cavity 402 drops to the compensation threshold 602, achieving rapid pressure recovery within 200ms. In addition, an innovative control logic is constructed through a multi-level judgment mechanism of preset pressure threshold 601, compensation threshold 602, and recovery threshold 603. Combined with the collaborative control of dynamic pressure relief in the airtight cavity 101 and on-demand compensation in the working cavity 402, the system's anti-interference capability is improved by more than 40%. These technological innovations together achieve the stability of air pressure fluctuation control within ±3% and micro-level accuracy of adhesive flow rate during the adhesive application process, which is significantly better than the fluctuation level of ±8%~10% in the prior art.

[0047] The embodiments described above are merely examples of several implementations of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A glue-applying device, characterized in that, include: An airtight cavity is located inside the main body of the equipment, and a first fluid channel, a second fluid channel and a third fluid channel are formed on the cavity wall respectively; The compressed air assembly includes an intake valve, a pressure relief valve, and a switching valve group that are respectively connected to the first fluid channel, the second fluid channel, and the third fluid channel; The pressure detection module includes: A first pressure sensor is installed inside the airtight cavity; A second pressure sensor is installed inside the working chamber of the adhesive applicator; The control module is connected to the compressed air assembly and the pressure detection module. The glue application equipment is connected to the airtight cavity via the switching valve group. When the value detected by the first pressure sensor is lower than the preset pressure threshold, the air intake valve is opened to increase the pressure. When the detected value exceeds the preset pressure threshold, the opening of the pressure relief valve is dynamically adjusted to achieve pressure balance. When the detected value is stable at the preset pressure threshold, the switching valve is controlled to cut off the connection between the airtight cavity and the switching valve group, and the reset operation of the switching valve is controlled according to the feedback value of the second pressure sensor.

2. The adhesive coating equipment according to claim 1, characterized in that, The switching valve group includes: Fourth fluid channel; The first and second air valves are interconnected through the fourth fluid channel. The air inlet of the second air valve is connected to the airtight cavity, and its air outlet is connected to the working chamber of the adhesive applicator. Gas flows from the second air valve to the first air valve through the fourth fluid channel to form a one-way air passage.

3. The adhesive coating equipment according to claim 2, characterized in that, The first air valve is connected to an external air compressor. When the detection value of the second pressure sensor reaches the replenishment threshold, the air compressor is connected to the adhesive applicator via the first air valve to vent the air in its working chamber. At this time, the first air valve cuts off the connection with the air compressor and simultaneously switches the valve reset operation.

4. The adhesive coating equipment according to claim 2, characterized in that, The adhesive coating equipment includes: The syringe has an airtight connection between its rear end and the outlet end of the second air valve through the connecting air tube, and a dispensing nozzle at its front end that is in fluid communication with the working chamber. A glue-filling structure is located on the outside of the syringe to replenish the glue.

5. A method for controlling the air pressure of an adhesive coating device, characterized in that, The air pressure control method is applied to the adhesive coating equipment according to any one of claims 1-4, and includes the following steps: S100 inputs pressurized gas into the airtight cavity through the compressed air assembly via the first fluid channel. When the pressure detection module identifies that the pressure in the airtight cavity exceeds the preset threshold, it activates the dynamic pressure relief function of the second fluid channel to maintain the pressure balance of the cavity. When the airtight cavity reaches the preset pressure value, the third fluid channel is cut off to block the direct connection between the gas control module and the airtight cavity, so that the airtight cavity and the glue application actuator form a closed-loop air pressure balance system. During the operation of the adhesive applicator, the S300 monitors the working air pressure parameters in real time. When the working air pressure drops to the compensation threshold, it activates the gas emission function of the gas control module and re-establishes the pressure compensation path between the airtight cavity and the adhesive applicator.

6. The air pressure control method for an adhesive coating equipment according to claim 5, characterized in that, The pressure parameters include at least the reference pressure parameters, system state parameters, and stability assessment parameters.

7. The air pressure control method for an adhesive coating equipment according to claim 6, characterized in that, The reference pressure parameters include a preset working pressure threshold, a compensation threshold, and a recovery threshold.

8. The air pressure control method for an adhesive coating equipment according to claim 5, characterized in that, S100 further includes the following steps: The dynamic opening adjustment includes: S110 calculates the PID control parameters of the pressure relief valve based on the difference between the real-time detection value of the first pressure sensor and the preset threshold. S120 outputs a pulse width modulation signal to the stepper motor of the pressure relief valve through the control module, so that the chamber pressure is maintained within the preset threshold fluctuation range of ±5%.

9. The air pressure control method for an adhesive coating equipment according to claim 5, characterized in that, S200 further includes the following steps: When the pressure in the airtight cavity remains stable and continuously reaches the first preset threshold, the control switching valve group executes the following: S210 closes the third fluid passage between the second air valve and the airtight cavity; S220 connects the second air valve to the working chamber of the adhesive applicator via a connecting air pipe, forming a closed-loop pressure balance system that includes an airtight chamber, the second air valve, and the working chamber.

10. The air pressure control method for an adhesive coating equipment according to claim 5, characterized in that, The S300 further includes the following steps: During the adhesive application process, the actual pressure value of the working chamber is monitored by a second pressure sensor. When the actual pressure value drops to a second preset threshold: S310 opens the connection between the first air valve and the air compressor. S320 replenishes air pressure to the working chamber through an air compressor until the actual pressure value is restored to the preset threshold. S330 synchronously restores the connection of the third fluid channel between the second air valve and the airtight cavity.

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