High-airtightness large sliding door suitable for high-low temperature environment and control method

Abstract

The invention discloses a high-airtightness large sliding door suitable for high and low temperature environments and a control method. The sliding door comprises a door frame, a door leaf, a guide mechanism, a driving mechanism and a control system. The door frame is provided with an inflation sealing structure, and the inflation sealing structure is connected with a gas pipeline with a charging and discharging magnetic valve and a pressure sensor. The door leaf is of a double-layer framework structure, and a plurality of broken bridge heat insulation blocks are arranged in the double-layer framework structure. The control method comprises a door closing sealing process and a door opening releasing process. The door closing sealing process comprises the steps that a door closing instruction is received; the driving mechanism is controlled to move the door leaf to a closed position; a charging and discharging magnetic valve for controlling the gas pipeline inflates the inflatable sealing structure; the door opening release process comprises the steps of receiving a door opening instruction; a charge and discharge magnetic valve for controlling the gas pipeline releases pressure for the inflatable sealing structure; and the driving mechanism is controlled to open the door leaf. The device has excellent air tightness, excellent high and low temperature adaptability, efficient heat blocking capability and safe and reliable intelligent control logic.

Description

Technical Field

[0001] This invention relates to the technical field of special industrial doors, and more particularly to a large sliding door with high airtightness suitable for high and low temperature environments and a control method thereof. Background Technology

[0002] In the industrial and scientific research fields, large-scale high and low temperature testing systems, such as vehicle environmental chambers and large equipment test chambers, have extremely high requirements for the airtightness, thermal insulation, and reliability of their access passages. These systems typically have large door openings and door panels that often weigh several tons, making traditional sliding doors insufficient.

[0003] Currently, most large sliding airtight doors commonly used in China employ recessed tracks and mechanically compressed sealing strips, such as rubber strips. This type of structure has the following inherent drawbacks:

[0004] Insufficient airtightness: Mechanical sealing strips rely on the pressure of the door leaf to achieve a seal. For large, heavy-duty door leaves, it is difficult to ensure uniform pressure at all points on the sealing surface. After long-term use, the sealing strips are prone to aging and plastic deformation, leading to seal failure. When using high-precision pressure attenuation methods for leak detection, the leakage rate often fails to meet the standards.

[0005] Poor low-temperature adaptability: In extremely low-temperature environments such as below -40°C, traditional rubber sealing strips will harden, shrink, lose elasticity, and their sealing performance will drop sharply. They may even freeze and stick to the metal door, making it impossible to open or close normally.

[0006] Severe thermal bridging effect: Without special thermal insulation design, large metal doors will form significant thermal bridges between the door frame and the door leaf skeleton, resulting in a large amount of heat exchange, which seriously affects the uniformity and stability of the internal temperature of the testing system and causes energy waste.

[0007] Incoordination between operation and control: The logic of opening, closing, locking, and sealing actions is simple and lacks closed-loop feedback. It is easy to damage the sealing mechanism due to incorrect action sequence, such as forcibly opening the door before complete depressurization.

[0008] Therefore, there is an urgent need for a solution for large sliding doors that can comprehensively address high airtightness, wide temperature range adaptability, efficient heat insulation, and intelligent collaborative control. Summary of the Invention

[0009] The present invention aims to overcome the shortcomings of the prior art and provide a large sliding door with high airtightness and control method suitable for high and low temperature environments.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A large, airtight sliding door suitable for high and low temperature environments includes a door frame, door leaf, guide mechanism, drive mechanism, and control system.

[0012] An inflatable sealing structure is installed on the end face of the door frame facing the door leaf. The inflatable sealing structure is connected to a gas pipeline with an inflatable and deflatable solenoid valve and a pressure sensor for detecting the internal pressure of the inflatable sealing structure.

[0013] The door leaf adopts a double-layer frame structure and several thermal break blocks are set inside the double-layer frame structure.

[0014] The guiding mechanism includes a bottom load-bearing track on the ground and a top anti-tilting guide track on the wall above the door frame. The door leaf is slidably installed between the bottom load-bearing track and the top anti-tilting guide track, and the door leaf is driven by a drive mechanism.

[0015] The charging and discharging solenoid valve, pressure sensor, and drive mechanism are all connected to the control system.

[0016] The inflatable sealing structure consists of two parts: an inner inflatable sealing strip and an outer inflatable sealing strip.

[0017] The double-layer frame structure of the door leaf is filled with polyurethane foam insulation blocks.

[0018] It also includes a low-temperature anti-sticking component, which is a self-regulating electric heating tape laid on the sealing surface where the door leaf contacts the inflatable sealing structure.

[0019] The drive mechanism includes a geared motor mounted on the ground and a rack plate installed at the bottom of the door leaf. The output shaft of the geared motor is installed by meshing with the rack plate through gears.

[0020] The rack plate is equipped with an open-position proximity switch and a closed-position proximity switch on both sides.

[0021] The bottom of the door leaf is equipped with at least three height-adjustable load-bearing rollers, which are rolled on the bottom load-bearing track; the top of the door leaf is equipped with several embedded guide wheels, which are slidably installed on the top anti-tilt guide track.

[0022] Mechanical limit wedge assemblies are provided on both sides of the door frame and both sides of the door leaf at the closed position.

[0023] A control method for regulating the opening and closing of a large, airtight sliding door suitable for high and low temperature environments, comprising a closing sealing process and an opening release process:

[0024] The door closing and sealing process includes the following steps:

[0025] S11: Receive door closing command;

[0026] S12: Control the drive mechanism to move the door to the closed position;

[0027] S13: The solenoid valve for controlling the filling and discharging of the gas pipeline is a gas filling and sealing structure.

[0028] S14: Monitor the internal pressure of the inflation sealing structure and stop inflation when the set pressure value is reached;

[0029] The door opening and release process includes the following steps:

[0030] S21: Receive door opening command;

[0031] S22: The solenoid valve for controlling the charging and discharging of the gas pipeline has a gas-sealed structure for pressure relief;

[0032] S23: Monitor the internal pressure of the inflatable sealing structure. When the pressure drops below the safety threshold, control the drive mechanism to open the door.

[0033] In step S23, the safety threshold is set to be less than or equal to 0.05 MPa.

[0034] The beneficial effects of this invention are: it has excellent airtightness, outstanding high and low temperature adaptability, efficient heat blocking capability, and safe and reliable intelligent control logic. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the door when it is closed in this invention;

[0036] Figure 2 This is a schematic diagram of the door opening structure in this invention;

[0037] Figure 3 This is a schematic diagram of the internal structure of the door leaf in this invention;

[0038] Figure 4 This is a schematic diagram of the bottom load-bearing track and drive mechanism in this invention;

[0039] Figure 5 This is a schematic diagram of the top anti-tilting guide rail in this invention;

[0040] Figure 6 This is a schematic diagram of the air-filled sealing structure in this invention;

[0041] In the diagram: 1-Door frame; 2-Door leaf; 3-Guide mechanism; 4-Drive mechanism; 5-Inflatable sealing structure; 6-Broken bridge thermal insulation block; 7-Polyurethane foam insulation block; 8-Self-regulating electric heating tape; 9-Load-bearing roller; 10-Mechanical limit wedge assembly;

[0042] 301 - Bottom load-bearing rail; 302 - Top anti-tilting guide rail;

[0043] 401 - Gear motor; 402 - Rack and pinion plate;

[0044] 501 - Inner inflatable sealing strip; 502 - Outer inflatable sealing strip;

[0045] The following will describe in detail, with reference to the accompanying drawings, embodiments of the present invention. Detailed Implementation

[0046] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0047] 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 invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0049] like Figures 1 to 6 As shown, a large sliding door with high airtightness suitable for high and low temperature environments includes a door frame 1, a door leaf 2, a guide mechanism 3, a drive mechanism 4, and a control system.

[0050] Both the frame 1 and the door leaf 2 have double-layer metal structures, preferably made of stainless steel 304.

[0051] An inflatable sealing structure 5 is installed on the end face of the door frame 1 facing the door leaf 2. The inflatable sealing structure 5 is connected to a gas pipeline with an inflatable and deflatable solenoid valve and a pressure sensor for detecting the internal pressure of the inflatable sealing structure 5.

[0052] The inflatable sealing structure 5 includes two parts: an inner inflatable sealing strip 501 and an outer inflatable sealing strip 502, both of which are annular structures.

[0053] A gas pipeline equipped with a charge / discharge solenoid valve is connected to an air pump. The gas pipeline is connected to a gas source, the charge / discharge solenoid valve controls the on / off state, and a pressure sensor is used to monitor the internal pressure of the inflation-sealing structure 5 in real time.

[0054] Door leaf 2 adopts a double-layer frame structure and has several thermal break blocks 6 inside the double-layer frame structure. The double-layer frame structure of door leaf 2 is filled with polyurethane foam insulation blocks 7, which effectively blocks the direct heat conduction path formed by the metal frame and greatly improves the heat insulation performance of the whole door.

[0055] It also includes a low-temperature anti-stick component, which is a self-regulating electric heating tape 8 laid on the sealing surface where the door leaf 2 contacts the inflatable sealing structure 5.

[0056] The charging and discharging solenoid valve, air pump, and pressure sensor are all connected to the control system.

[0057] The guide mechanism 3 includes a bottom load-bearing rail 301 set on the ground and a top anti-tilt guide rail 302 set on the wall above the door frame 1. The door leaf 2 is slidably installed between the bottom load-bearing rail 301 and the top anti-tilt guide rail 302.

[0058] The bottom of the door leaf 2 is provided with at least three height-adjustable load-bearing rollers 9. The load-bearing rollers 9 are rolled on the bottom load-bearing track 301, supporting the entire weight of the door leaf 2 and rolling along the bottom load-bearing track 301.

[0059] The top of the door leaf 2 is provided with several embedded guide wheels, which are slidably installed on the top anti-tilt guide rail 302 to constrain the degree of freedom of the door leaf 2 in the front and back directions and prevent it from swinging.

[0060] Door leaf 2 is driven by drive mechanism 4, which is connected to the control system.

[0061] The drive mechanism 4 includes a geared motor 401 mounted on the ground and a rack plate 402 mounted on the bottom of the door leaf 2. The output shaft of the geared motor 401 is installed by meshing with the rack plate 402 through gears to form a gear and rack transmission pair, which provides the door leaf 2 with smooth, precise and high thrust linear motion.

[0062] The rack plate 402 is equipped with an open position proximity switch and a closed position proximity switch on both sides.

[0063] Mechanical limit wedge assemblies 10 are provided on both sides of the door frame 1 and both sides of the door leaf 2 at the closed position. When the door leaf 2 is closed, the corresponding mechanical limit wedge assemblies 10 on the door frame 1 and the door leaf 2 contact each other, providing rigid stop and precise positioning, ensuring that the position of the door leaf 2 remains unchanged when subjected to positive and negative pressure differences, and ensuring the alignment of the sealing surface.

[0064] The control system is centered on a programmable logic controller (PLC), and is electrically connected to the geared motor 401 of the drive mechanism 4, the inflation / deflation solenoid valve of the inflation / sealing structure 5, the air pump, the pressure sensor, the open and closed proximity switches, and the operation buttons. The PLC coordinates and controls the sequence of the door's opening, closing, and sealing actions according to the preset program logic.

[0065] The PLC models can be Siemens S7-200, S7-1200, S7-300, and S7-400 series.

[0066] A control method for regulating the opening and closing of a large, airtight sliding door suitable for high and low temperature environments, comprising a closing sealing process and an opening release process:

[0067] The door closing and sealing process includes the following steps:

[0068] S11: Receive door closing command;

[0069] S12: The PLC controls the geared motor 401 of the drive mechanism 4 to move the door 2 to the closed position. When the door 2 moves to the point where the closed proximity switch is triggered, the PLC controls the geared motor 401 to stop.

[0070] When the ambient temperature is lower than the preset temperature threshold, the low-temperature anti-sticking mechanism is activated to gradually heat the sealing contact surface;

[0071] S13: The solenoid valve for charging and discharging gas pipeline controlled by PLC is a gas-charging sealed structure 5 for gas charging;

[0072] S14: The pressure sensor monitors the internal pressure of the inflation sealing structure 5 in real time and feeds back the pressure value to the PLC. When the pressure reaches the set pressure value, the PLC controls the inflation to stop and enters the pressure holding monitoring state, and the door closing and sealing process is completed.

[0073] The door opening and release process includes the following steps:

[0074] S21: Receive door opening command;

[0075] S22: The solenoid valve for charging and discharging gas pipeline controlled by PLC has a gas-charging sealed structure and pressure relief.

[0076] S23: The pressure sensor monitors the internal pressure of the inflatable sealing structure 5 in real time and feeds back the pressure value to the PLC. When the pressure drops below the safety threshold, the safety threshold is set to be lower than or equal to 0.05MPa. The PLC controls the geared motor 401 of the drive mechanism 4 to open the door 2.

[0077] S24, when door leaf 2 runs to the point where the proximity switch is triggered to open, the PLC controls the geared motor 401 to stop, and the door opening and release process is completed.

[0078] This invention features ultra-high airtightness: it adopts an active pressurized inflatable seal, and the expansion of the rubber strip can adaptively compensate for minor unevenness between the door leaf 2 and the door frame 1, forming a uniform and reliable line seal; the double-seal design provides double protection and can easily meet the stringent pressure decay method airtightness test standards.

[0079] This invention has excellent high and low temperature adaptability: the thermal break and polyurethane filling design ensure thermal insulation performance in a wide temperature range; the self-regulating electric heating tape 8 completely solves the problem of seal adhesion and failure at extremely low temperatures, enabling the door to work reliably in extreme environments such as -70℃ to +150℃.

[0080] The invention operates stably and accurately: the gear and rack drive combined with the upper and lower dual guide system ensures that the large door leaf 2, weighing several tons, runs smoothly and is accurately positioned. The mechanical limit wedge block assembly 10 provides final rigid positioning and enhances the system's ability to resist pressure differential deformation.

[0081] This invention enables intelligent and safe control: the PLC-controlled "depressurize first, then open the door" and "close the door first, then pressurize" logic fundamentally avoids mechanical damage to the sealing system caused by misoperation; the pressure closed-loop control ensures the constant and reliable sealing force.

[0082] The structure of this invention is robust and durable: the all-stainless steel welded body and double-layer frame design ensure the overall strength of the door leaf 2 and its long service life in industrial environments.

[0083] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A large sliding door with high airtightness suitable for high and low temperature environments, characterized in that, It includes a door frame (1), a door leaf (2), a guide mechanism (3), a drive mechanism (4), and a control system; An inflatable sealing structure (5) is installed on the end face of the door frame (1) facing the door leaf (2). The inflatable sealing structure (5) is connected to a gas pipeline with an inflatable and deflatable solenoid valve and a pressure sensor for detecting the internal pressure of the inflatable sealing structure (5). The door leaf (2) adopts a double-layer frame structure and several thermal break blocks (6) are installed inside the double-layer frame structure. The guide mechanism (3) includes a bottom load-bearing rail (301) set on the ground and a top anti-tilt guide rail (302) set on the wall above the door frame (1). The door leaf (2) is slidably installed between the bottom load-bearing rail (301) and the top anti-tilt guide rail (302). The door leaf (2) is driven by the drive mechanism (4). The charging and discharging solenoid valve, pressure sensor, and drive mechanism (4) are all connected to the control system.

2. A large, airtight sliding door suitable for high and low temperature environments according to claim 1, characterized in that, The inflatable sealing structure (5) includes two parts: an inner inflatable sealing strip (501) and an outer inflatable sealing strip (502).

3. A large, airtight sliding door suitable for high and low temperature environments as described in claim 1, characterized in that, The double-layer frame structure of the door leaf (2) is filled with polyurethane foam insulation blocks (7).

4. A large sliding door with high airtightness suitable for high and low temperature environments as described in claim 3, characterized in that, It also includes a low-temperature anti-sticking component, which is a self-regulating electric heating tape (8) laid on the sealing surface where the door leaf (2) contacts the inflatable sealing structure (5).

5. A large sliding door with high airtightness suitable for high and low temperature environments according to claim 1, characterized in that, The drive mechanism (4) includes a geared motor (401) installed on the ground and a rack plate (402) installed at the bottom of the door leaf (2). The output shaft of the geared motor (401) is installed by meshing with the rack plate (402) through a gear.

6. A large, airtight sliding door suitable for high and low temperature environments according to claim 5, characterized in that, The rack plate (402) is provided with an open position proximity switch and a closed position proximity switch on both sides respectively.

7. A large, airtight sliding door suitable for high and low temperature environments according to claim 1, characterized in that, The bottom of the door leaf (2) is provided with at least three height-adjustable load-bearing rollers (9), which are rolled on the bottom load-bearing track (301); the top of the door leaf (2) is provided with several embedded guide wheels, which are slidably installed on the top anti-tilt guide track (302).

8. A large sliding door with high airtightness suitable for high and low temperature environments according to claim 1, characterized in that, Mechanical limit wedge assemblies (10) are provided on both sides of the door frame (1) and both sides of the door leaf (2) at the closed position.

9. A control method for regulating the opening and closing of a large, airtight sliding door suitable for high and low temperature environments as described in any one of claims 1-8, characterized in that, This includes the door closing and sealing process and the door opening and releasing process: The door closing and sealing process includes the following steps: S11: Receive door closing command; S12: Control the drive mechanism (4) to move the door (2) to the closed position; S13: The solenoid valve for controlling the filling and discharging of the gas pipeline is a gas filling and sealing structure (5) filling; S14: Monitor the internal pressure of the inflation sealing structure (5) and stop inflation when the set pressure value is reached; The door opening and release process includes the following steps: S21: Receive door opening command; S22: The solenoid valve for controlling the charging and discharging of the gas pipeline is a gas-filling sealed structure (5) for depressurization; S23: Monitor the internal pressure of the inflatable sealing structure (5). When the pressure drops below the safety threshold, control the drive mechanism (4) to open the door (2).

10. The control method according to claim 6, characterized in that, In step S23, the safety threshold is set to be less than or equal to 0.05 MPa.

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