A quick maintenance door structure for a painting booth

Abstract

The utility model relates to a kind of coating spray booth quick access door structure, including door frame and door panel, three-point linkage locking mechanism is provided between door panel and door frame, including top lock tongue, middle lock tongue, bottom lock tongue and the drive component of driving three lock tongues synchronous horizontal telescoping;Main sealing groove and auxiliary sealing groove are equipped on door frame, and main sealing convex rib, auxiliary sealing convex rib are equipped on door panel and cooperate therewith;Pressure sensor is set on door frame, and pressure sensor and drive component are electrically connected with the control module on door panel, and connect control terminal, through the systematic combination of "three-point linkage uniform locking+multistage sealing deformation adaptation+pressure abnormal interlocking control", the single performance improvement of traditional access door is broken through, effectively solve coating spray booth access door paint mist easy to leak and the sealing problem such as, simultaneously solve the problem that three-point linkage locking mechanism weak vibration resistance, long-term use is prone to loose, the sealing property and security of coating workshop are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of industrial coating equipment technology, and in particular to a quick inspection door structure for a coating spray booth. Background Technology

[0002] In painting operations, especially in painting booths, specialized door structures designed for daily maintenance are crucial for ensuring production continuity and painting quality, and are key components in the intelligent transformation of modern painting production lines. However, existing maintenance door mechanisms face numerous challenges in practical applications. For example, patent CN210317048U discloses a maintenance door for a painting equipment heating device, which uses single-point / double-point locking. Uneven force on the door panel leads to localized wear of the sealing strip, and a single sealing groove cannot adapt to door frame deformation (such as gaps caused by temperature differences and vibrations). Paint mist can easily penetrate through the gaps, resulting in poor sealing reliability. In addition, its locking mechanism has weak vibration resistance and is prone to loosening after long-term use. Furthermore, it lacks interlocking control with the internal pressure of the painting booth, posing a safety hazard of accidental opening under high-pressure conditions (such as the risk of deflagration), making it difficult to meet the high safety and high sealing requirements of painting workshops. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] In view of the limitations of existing painting booth inspection doors, the purpose of this utility model is to provide a quick inspection door structure for painting booths. Through a systematic combination of "three-point linkage uniform locking + multi-level sealing to adapt to deformation + pressure abnormality interlock control", it breaks through the single performance improvement of traditional inspection doors, and achieves synergistic optimization of "stress-sealing-safety". It effectively solves the sealing problems of uneven stress on the door panel of the painting booth inspection door, which leads to local wear of the sealing strip, and the single sealing groove cannot adapt to the deformation of the door frame, which leads to easy leakage of paint mist. At the same time, it solves the problems of weak vibration resistance of traditional locking mechanisms, easy loosening after long-term use, and lack of interlock control with the internal pressure of the spray booth, which poses safety hazards. It greatly improves the sealing and safety of the painting workshop.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a quick-access maintenance door structure for a painting booth, comprising a door frame and a door panel that can be opened and closed and installed within the door frame. A three-point linkage locking mechanism is provided between the door panel and the door frame. The three-point linkage locking mechanism includes a top latch, a middle latch, and a bottom latch distributed vertically along the door frame, and a drive assembly that drives the top latch, middle latch, and bottom latch to extend and retract horizontally synchronously. The door frame is provided with a main sealing groove and an auxiliary sealing groove, and the door panel is provided with a main sealing protrusion and an auxiliary sealing protrusion that cooperate with the main sealing groove and the auxiliary sealing groove. Pressure sensors are respectively provided at the four corners of the door frame, and a control module is provided on the surface of the door panel. The pressure sensors and the drive assembly are electrically connected to the control module, and the control module interacts with the terminal control system. The top, middle, and bottom latches are vertically distributed along the door frame and achieve synchronous horizontal extension and retraction through the drive assembly, allowing the door panel and the door frame to be tightly connected at multiple positions, enhancing the overall sealing and robustness. The main and auxiliary sealing grooves are on the door frame, and the main and auxiliary sealing protrusions are on the door panel. These two components work together to effectively prevent external dust and gas from entering the equipment, improving the sealing effect. Pressure sensors at the four corners of the door frame monitor the pressure around the frame in real time. The control module on the door panel receives the pressure sensor data. The control module's height is aligned with the center bolt's pressure level for easy operation and observation.

[0007] Preferably, the main sealing groove is a trapezoidal sealing groove with segmented silicone tubes embedded inside, and the auxiliary sealing groove is a U-shaped sealing groove with memory foam embedded inside. Both the main and auxiliary sealing grooves are arranged around the circumference of the door frame and are spaced 5-10mm apart along the width of the door frame. The silicone tubes have good elasticity and sealing performance, which can fill gaps and prevent leakage. The memory foam can return to its original shape after being compressed, further enhancing the sealing effect. The two are arranged around the circumference of the door frame and are spaced apart to form a multi-level seal.

[0008] Furthermore, a second sealing strip is circumferentially installed around the top, middle, and bottom latches, with an "L"-shaped cross-section. The auxiliary sealing groove is vertically offset from the main sealing groove by 5-10mm. The "L"-shaped second sealing strip prevents leakage at the gap between the latch and the door frame, further improving sealing performance. The vertical offset increases the sealing path length, enhancing the sealing effect.

[0009] Preferably, the top latch, middle latch, and bottom latch are spaced apart along the height of the door frame, and corresponding top, middle, and bottom lock holes are provided on the door frame. The ends of the latches are wedge-shaped, and the inner walls of the lock holes are provided with guide slopes. The spacing between the top, middle, and bottom latches is 1 / 3 to 1 / 2 of the door panel height, which ensures even force distribution on the door panel. The wedge-shaped structure at the end of the latch and the guide slope on the inner wall of the lock hole cooperate with each other to facilitate the insertion and removal of the latches, improving operational convenience.

[0010] Preferably, the drive assembly includes a worm gear reducer. The worm of the worm gear reducer is coaxially connected to the drive motor. The worm wheel is connected to the top locking tongue, middle locking tongue, and bottom locking tongue via a transmission link, enabling synchronous horizontal extension and retraction of the three locking tongues. The drive motor drives the worm of the worm gear reducer to rotate, and the worm wheel is connected to the locking tongues via the transmission link, achieving synchronous horizontal extension and retraction of the three locking tongues and ensuring consistency of the locking action. The worm gear reducer used here employs conventional technology; therefore, its specific configuration and working principle will not be described in detail.

[0011] Preferably, the door panel is rotatably connected to the door frame via a hinge shaft. The door panel has a three-layer structure, including an outer explosion-proof steel plate, a middle damping layer, and an inner conductive coating. The explosion-proof steel plate is used to prevent external impacts from damaging the internal components of the equipment; the middle damping layer is used to reduce vibration and noise; and the inner conductive coating prevents static electricity buildup from causing safety accidents.

[0012] Preferably, the segments of the segmented silicone tube are connected by quick-connect couplings, with sealing rings at the joints. The memory foam has a density of 30-50 kg / m³ and a compression set of ≤15%. The quick-connect couplings connecting the segments of the silicone tube employ conventional technology; therefore, their specific configuration and connection method are not detailed here. The specific density and compression set of the memory foam ensure that it maintains good elasticity and sealing performance during long-term use.

[0013] (III) Beneficial Effects

[0014] (1) A multi-level sealing system is formed by setting the main sealing groove with a trapezoidal cross section and embedded segmented silicone tube, and the auxiliary sealing groove with a U-shaped cross section and embedded memory foam along the circumference of the door frame and staggered in the vertical direction. The elasticity of the silicone tube and the high resilience of the memory foam can fit tightly with the main sealing ridge and auxiliary sealing ridge of the door panel, effectively blocking the leakage of paint mist, solvent vapor, etc. At the same time, the "L"-shaped second sealing strips set around the top, middle and bottom lock tongues fill the gaps in the lock hole area, further enhancing the overall sealing performance and meeting the stringent requirements of high airtightness for painting operations.

[0015] (2) Pressure sensors at the four corners of the door frame collect sealing pressure data in real time, which is then transmitted to the control module and linked with the terminal control system. When the pressure at a certain point is abnormal, the control module drives the worm gear reducer, which drives the top, middle, and bottom latches to extend and retract horizontally synchronously through the transmission linkage, dynamically adjusting the locking force to achieve the pressure interlocking function, balance the sealing pressure, and avoid leakage risks. The three-point linkage locking mechanism, together with the wedge-shaped latch and the guide slope of the lock hole, ensures uniform and reliable locking. In addition, the pressure data and locking status can be remotely monitored through the terminal system, improving the safety and intelligent management level of the maintenance door under complex working conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the three-point linkage locking mechanism in this utility model;

[0018] Figure 3 This is a cross-sectional view of the multi-stage sealing structure in this utility model;

[0019] Figure 4 This is a front view of the multi-stage sealing structure in this utility model;

[0020] Figure 5 This is the electrical control schematic diagram of this utility model;

[0021] Figure 6 This is a side view of the door panel of this utility model in the open state.

[0022] In the diagram: 1-Door frame, 101-Top lock hole, 102-Middle lock hole, 103-Bottom lock hole, 11-Main sealing groove, 110-Segmented silicone tube, 12-Auxiliary sealing groove, 120-Memory foam, 15c-Quick connector, 2-Door panel, 21-Main sealing ridge, 22-Auxiliary sealing ridge, 23-Outer explosion-proof steel plate, 24-Intermediate damping layer, 25-Inner conductive coating, 3-Three-point linkage locking mechanism, 301-Top latch, 302-Middle latch, 303-Bottom latch, 304-Drive assembly, 340-Worm gear reducer, 341-Worm, 342-Drive motor, 343-Worm gear, 344-Transmission link, 4-Pressure sensor, 5-Control module, 6-Hinge shaft. Detailed Implementation

[0023] The following will refer to the appendix in the embodiments of this utility model. Figure 1 -Appendix Figure 6 The technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Example 1: As Figure 1As shown, the first specific embodiment of this utility model provides a quick-access maintenance door structure for a painting booth, including a door frame 1 and a door panel 2 that can be opened and closed and installed inside the door frame 1. A three-point linkage locking mechanism 3 is provided between the door panel 2 and the door frame 1. The three-point linkage locking mechanism 3 includes a top latch 301, a middle latch 302, and a bottom latch 303 distributed along the vertical direction of the door frame 1, and a drive assembly 304 that drives the top latch 301, the middle latch 302, and the bottom latch 303 to extend and retract horizontally synchronously. The door frame 1 is provided with a main sealing groove 11 and an auxiliary sealing groove 12, and the door panel 2 is provided with a main sealing protrusion 21 and an auxiliary sealing protrusion 22 that cooperate with the main sealing groove 11 and the auxiliary sealing groove 12. Pressure sensors 4 are respectively provided at the four corners of the door frame 1, and a control module 5 is provided on the surface of the door panel 2. The pressure sensors 4 and the drive assembly 304 are electrically connected to the control module 5, and the control module 5 interacts with the terminal control system. The three-point linkage locking mechanism 3 achieves a tight connection with the door frame 1; the pressure sensor 4 is used to monitor the pressure around the door frame 1, and the control module 5 controls the action of the three-point linkage locking mechanism 3 according to the signal of the pressure sensor 4, and interacts with the terminal control system.

[0025] In other words, when there is pressure inside the equipment, pressure sensor 4 transmits a pressure signal to control module 5, which then determines whether the pressure exceeds the safe range. If it does, control module 5 will disable the drive component 304 to prevent accidental opening of the door under pressure, thus ensuring the safety of operators. Simultaneously, control module 5 can also transmit pressure information and the status information of the maintenance door to the terminal control system, facilitating remote monitoring and management by operators.

[0026] Furthermore, pressure sensor 4 is a diffused silicon type with a range of 0-10 kPa, an accuracy of ±0.2% FS, and a response time ≤100ms. It is embedded in the four corners of the door frame, with the probe flush with the surface of the door frame 1, sealed by O-rings (made of nitrile rubber), and the wires are twisted-pair shielded cables with the shield grounded at one end. Control module 5 uses an STM32F103RCT6 microcontroller with a built-in pressure threshold comparison program: when the measured pressure value at any corner is <80% or >120% of the set value, the drive motor power is cut off within 100ms, and an alarm signal is sent to the terminal control system via the interface; the set value can be remotely adjusted through the terminal system, with a default value of ±15% of the normal operating pressure of the equipment.

[0027] The main sealing groove 11 is a trapezoidal sealing groove, in which a segmented silicone tube 110 is embedded. The auxiliary sealing groove 12 is a U-shaped sealing groove, in which a memory foam 120 is embedded. Both the main sealing groove 11 and the auxiliary sealing groove 12 are arranged around the circumference of the door frame 1 and are distributed at intervals of 5-10mm along the width direction of the door frame 1. When the door panel 2 is closed, the main sealing ridge 21 is embedded in the main sealing groove 11, squeezing the segmented silicone tube 110, causing it to undergo elastic deformation and filling the gap between the main sealing ridge 21 and the main sealing groove 11, thereby achieving a good sealing effect. At the same time, the auxiliary sealing ridge 22 is embedded in the auxiliary sealing groove 12, squeezing the memory foam 120. The memory foam 120 can quickly return to its original shape after being compressed, further enhancing the sealing effect. When the segmented silicone tube 110 is embedded in the main sealing groove (11), it is fixed by the dovetail tenon structure in the groove and the gap is filled with silicone sealant. When installing memory foam 120, apply acrylic pressure-sensitive adhesive to the back and adhere it to the bottom of the U-shaped groove, extending the edge 2mm beyond the groove opening to create a redundant seal.

[0028] The second sealing strip, which is circumferentially installed around the top latch 301, the middle latch 302, and the bottom latch 303, has an "L" shaped cross section and is made of ethylene propylene diene monomer (EPDM) rubber. It is fixed to the door frame surface by stainless steel pressure strips and M4 screws. The compression of the strip is 30%-40% to ensure no leakage in the lock hole area.

[0029] The top latch 301, middle latch 302, and bottom latch 303 are distributed at intervals along the height direction of the door frame 1. Correspondingly, the door frame 1 is provided with a top lock hole 101, a middle lock hole 102, and a bottom lock hole 103. The ends of the latches are wedge-shaped, and the inner walls of the lock holes are provided with guide slopes. The wedge-shaped angle of the latch is 30°, and the angle of the guide slope on the inner wall of the lock hole is matched with 30° to ensure the guiding accuracy when the latch is inserted. The spacing between the three latches along the height direction of the door frame is 1 / 3 of the door panel height, and the center distance of the top latch from the top of the door panel and the center distance of the bottom latch from the bottom of the door panel are both 50-100mm to ensure uniform force distribution.

[0030] The drive assembly 304 includes a worm gear reducer 340. The worm 341 of the worm gear reducer 340 is coaxially connected to the drive motor 342. The worm gear 343 is connected to the top latch 301, the middle latch 302, and the bottom latch 303 via a transmission connecting rod 344, achieving synchronous horizontal extension and retraction of the three latches. The worm gear 343 has three evenly spaced hinge points circumferentially, connected to one end of the transmission connecting rod 344 via a pin. The transmission connecting rod 344 has a hollow tubular structure with an M12 threaded adjusting sleeve in the middle, with an adjustment range of ±5mm. It is fixed with a locking nut to ensure that the synchronous extension and retraction error of the three latches is ≤0.3mm. The other end of the transmission connecting rod slides into the T-slot at the tail of the latch to achieve horizontal transmission. The worm gear reducer 340 is bolted to a stainless steel bracket at the top of the door frame 1. The bracket thickness is ≥5mm to ensure transmission stability.

[0031] When the drive motor 342 starts, it drives the worm gear 341 to rotate, which in turn drives the worm wheel 343 to rotate. The worm wheel 343 is connected to the top latch 301, the middle latch 302, and the bottom latch 303 through the transmission link 344. Utilizing the transmission characteristics of the worm gear reducer, the synchronous horizontal extension and retraction of the three latches are achieved. This transmission method has a self-locking function, meaning that when the drive motor stops rotating, the latches can maintain their current position, ensuring a stable and reliable locked state of the door.

[0032] Furthermore, the transmission connecting rod is an adjustable connecting rod with a threaded sleeve in the middle, and the adjustment range is ±3mm, which is used to calibrate the synchronous extension and retraction error of the three locking tongues to ≤0.5mm.

[0033] Door panel 2 is rotatably connected to door frame 1 via hinge shaft 6. Door panel 2 has a three-layer structure, including an outer explosion-proof steel plate 23, a middle damping layer 24, and an inner electrostatic conductive coating 25. Hinge shaft 6 is made of 304 stainless steel with a surface roughness Ra≤1.6μm. Both door frame 1 and door panel 2 are equipped with copper alloy bushings. The bushings and hinge shaft 6 are fitted with an H7 / k6 interference fit, with a single bearing load capacity ≥800kg, ensuring that the door panel can be opened and closed 50,000 times without significant loosening.

[0034] The segments of the segmented silicone tube 110 are connected by quick-connect fittings 15c, and a sealing ring is provided at the connection. The density of the memory foam 120 is 30-50 kg / m², and the compression set is ≤15%.

[0035] Working principle: When in use, the terminal control system sends an opening and closing command to the control module 5. The control module 5 drives the drive assembly 304 (that is, the worm gear reducer 340) to run. The worm 341 drives the worm wheel 343 to rotate. Through the transmission link 344, the top locking tongue 301, the middle locking tongue 302, and the bottom locking tongue 303 extend horizontally in sync. The wedge-shaped locking tongue ends slide into the top locking hole 101, the middle locking hole 102, and the bottom locking hole 103 respectively along the guide slope of the inner wall of the lock hole, realizing the three-point linkage locking of the door panel 2 and the door frame 1.

[0036] During the locking process, the main sealing protrusion 21 and the auxiliary sealing protrusion 22 of the door panel 2 are respectively embedded in the main sealing groove 11 (trapezoidal groove, with embedded segmented silicone tube 110) and the auxiliary sealing groove 12 (U-shaped groove, with embedded memory foam 120) of the door frame 1. The main sealing groove 11 and the auxiliary sealing groove 12 are distributed around the door frame 2 and are vertically offset by 5-10mm and spaced by 5-10mm. The elastic deformation of the segmented silicone tube 110 and the compression resilience of the memory foam 120 form a multi-level seal to prevent paint mist and steam leakage. At the same time, the "L"-shaped second sealing strip around the lock tongue presses against the door frame to fill the gap in the lock hole area.

[0037] Pressure sensors 4 at the four corners of the door frame 1 monitor the sealing pressure at each location in real time and transmit the data to the control module 5. If the pressure in a certain area is abnormal (such as a pressure drop caused by local seal failure), the control module 5 automatically adjusts the drive assembly 304 to drive the lock tongue to fine-tune its extension and retraction to dynamically balance the pressure and achieve the pressure interlocking function.

[0038] Example 2: Door panel 2 is rotatably connected to door frame 1 via hinge shaft 6. When opened, drive assembly 304 reverses to retract the latch, releasing the locked state. The three-layer door panel (outer explosion-proof steel plate 23, middle damping layer 24, and inner electrostatic conductive coating 25) rotates around hinge shaft 6 to open, facilitating maintenance. After maintenance, the above locking process is repeated. The segmented silicone tube 110, connected by quick-connect connectors 15c, and memory foam (density 30-50 kg / m³, compression set ≤15%) form a reliable seal again. Simultaneously, control module 5 feeds back status data to the terminal control system, completing one full opening and closing operation.

Claims

1. A quick-access inspection door structure for a painting spray booth, comprising a door frame (1) and a door panel (2) that can be opened and closed and installed within the door frame (1), characterized in that, A three-point linkage locking mechanism (3) is provided between the door panel (2) and the door frame (1). The three-point linkage locking mechanism (3) includes a top latch (301), a middle latch (302), and a bottom latch (303) distributed along the vertical direction of the door frame (1), and a drive assembly (304) that drives the top latch (301), the middle latch (302), and the bottom latch (303) to extend and retract horizontally synchronously. The door frame (1) is provided with a main sealing groove (11) and an auxiliary sealing groove (12). The door panel (2) is provided with a main sealing protrusion (21) and an auxiliary sealing protrusion (22) that cooperate with the main sealing groove (11) and the auxiliary sealing groove (12). Pressure sensors (4) are respectively provided at the four corners of the door frame (1). A control module (5) is provided on the surface of the door panel (2). The pressure sensors (4) and the drive assembly (304) are electrically connected to the control module (5), and the control module (5) interacts with the terminal control system.

2. The quick-access inspection door structure for a painting booth according to claim 1, characterized in that, The main sealing groove (11) is a trapezoidal sealing groove, and a segmented silicone tube (110) is embedded in the groove. The auxiliary sealing groove (12) is a U-shaped sealing groove, and a memory foam (120) is embedded in the groove. The main sealing groove (11) and the auxiliary sealing groove (12) are both arranged around the circumference of the door frame (1) and are distributed at intervals of 5-10mm along the width direction of the door frame (1).

3. The quick-access inspection door structure for a painting spray booth according to claim 1, characterized in that, The top latch (301), middle latch (302) and bottom latch (303) are distributed at intervals along the height direction of the door frame (1). The door frame (1) is provided with a top lock hole (101), a middle lock hole (102) and a bottom lock hole (103). The end of the latch is a wedge-shaped structure and the inner wall of the lock hole is provided with a guide slope.

4. The quick-access inspection door structure for a painting spray booth according to claim 1, characterized in that, The drive assembly (304) includes a worm gear reducer (340). The worm (341) of the worm gear reducer (340) is coaxially connected to the drive motor (342). The worm wheel (343) is connected to the top locking tongue (301), the middle locking tongue (302), and the bottom locking tongue (303) through the transmission link (344) to realize the synchronous horizontal extension and retraction of the three locking tongues.

5. The quick-access inspection door structure for a painting spray booth according to claim 1, characterized in that, The door panel (2) is rotatably connected to the door frame (1) via a hinge shaft (6). The door panel (2) has a three-layer structure, including an outer explosion-proof steel plate (23), a middle damping layer (24), and an inner electrostatic conductive coating (25).

6. The quick-access inspection door structure for a painting spray booth according to claim 2, characterized in that, The segments of the segmented silicone tube (110) are connected by quick-connect fittings (15c), and a sealing ring is provided at the connection. The memory foam (120) has a density of 30-50 kg / m³ and a compression set of ≤15%.

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