A movable combined door

Abstract

The present invention provides a movable combined door, comprising one or more modules composed of a main door and / or a secondary door, wherein the main door and / or the secondary door are arranged in a front-to-back staggered manner and connected and fixed; the outer vertical door frame of the main door and / or the secondary door is installed with an anti-collision rubber strip profile, and the anti-collision rubber strip is fixed on the anti-collision rubber strip profile; the outer side of the anti-collision rubber strip is a thin-walled hollow bracket structure, and a controllable magnetic fluid damper and / or a control circuit are installed in the thin-walled hollow bracket structure, and the magnetic fluid damper includes magnetic fluid; under normal conditions, the control circuit applies a strong magnetic field, the magnetic fluid maintains a high viscosity state, and the outer side of the anti-collision rubber strip exhibits rigidity; when the anti-collision rubber strip is squeezed by an external force, the control circuit cuts off the magnetic field, the magnetic fluid resumes flowing, and the outer side of the anti-collision rubber strip achieves flexible shock absorption. This movable combined door with anti-collision and anti-pinch functions effectively solves the anti-collision and anti-pinch problems caused by the left and right moving combined door after the platform safety door is linked, and improves the safety of waiting for the train.

Description

Technical Field

[0001] The invention relates to the field of platform safety doors, and in particular to a movable combined door with anti-collision and anti-pinch functions. Background Art

[0002] With the acceleration of urbanization and the development of urban agglomeration, the construction of high-speed railways, intercity railways, and urban railways, the personal safety requirements of passengers waiting on the platform at railway stations have increased. The installation of platform doors on railway station platforms can improve the safety of waiting on the platform. As a public safety protection device, the platform safety door is set along the edge of the platform to isolate the train from the platform waiting area. The safety door of the platform safety door opens after the train enters the station and stops steadily, and closes and locks before the train leaves the station.

[0003] High-speed rail platforms have many types of vehicles parked, and the positions of the doors are complex and changeable when the trains stop. The standard opening position of the safety doors on traditional subway platforms is fixed, which cannot adapt to the changing door positions and cannot be used on such high-speed rail platforms. The current platform doors need to be designed with multiple movable doors that can be opened left and right to ensure that the opening space of the platform doors is directly opposite to the doors of different trains. In this case, the movable doors need to be opened to the left and right, so as to prevent the passengers from being squeezed or hit from the left and right directions, which will cause damage to the passengers. At the same time, it is required to prevent accidents such as pinching fingers at the joints of multiple doors due to people inserting their fingers into the door gaps, so as to ensure the safety of passengers waiting for the train. The existing safety door design cannot meet the above requirements. Summary of the invention

[0004] The present invention provides a movable combined door with anti-collision and anti-pinch functions, which effectively solves the anti-collision and anti-pinch problems caused by the left and right movable combined door after the platform safety door is linked, and improves the safety of waiting for the train.

[0005] To achieve the above-mentioned purpose, the present invention provides a movable combined door, wherein the movable combined door includes one or more modules composed of a main door and / or a secondary door, the main door and / or the secondary door are arranged in a front-to-back staggered manner and are connected and fixed; the outer vertical door frame of the main door and / or the secondary door is installed with an anti-collision rubber strip profile, and the anti-collision rubber strip is fixed on the anti-collision rubber strip profile; the outer side of the anti-collision rubber strip is a thin-walled hollow bracket structure, and a controllable magnetic fluid damper and / or a control circuit are installed in the thin-walled hollow bracket structure, and the magnetic fluid damper includes magnetic fluid; under normal conditions, the control circuit applies a strong magnetic field, the magnetic fluid maintains a high viscosity state, and the outer side of the anti-collision rubber strip exhibits rigidity; when the anti-collision rubber strip is squeezed by external force, the control circuit cuts off the magnetic field, the magnetic fluid resumes flowing, and the outer side of the anti-collision rubber strip achieves flexible shock absorption.

[0006] The movable combined door increases the linkage effect of the door body through the staggered arrangement and connection and fixation of the main door and the auxiliary door, and better adapts to the variable door positions. At the same time, the anti-collision rubber strips of the main door and / or the auxiliary door are set to reduce the impact force of the door module on the passengers when the door body moves, and play an anti-collision and anti-pinch effect.

[0007] Among them, the outer side of the anti-collision rubber strip is a thin-walled hollow bracket structure. By installing a controllable magnetic fluid damper and / or a control circuit, the outer side of the anti-collision rubber strip is rigid and has shape retention when not subjected to external force; when squeezed by external force, the magnetic fluid resumes flow, and reduces personal injury through flexible shock absorption. Therefore, by designing a thin-walled bracket and a magnetic fluid damper and / or a control circuit inside, it has a good shape retention ability when not subjected to external force, and has fluidity and can be deformed when squeezed by external force, and can recover after deformation, so that the door body can buffer the impact force when encountering obstacles such as human bodies during the closing process, avoiding hitting pedestrians and damaging objects. The left-right moving combination door can reduce the impact force on the human body when moving left and right, and has the effect of preventing collision and pinching.

[0008] Preferably, the present invention provides a movable combined door, wherein the magnetic fluid includes a magnetic material and / or an inert fluid carrier; the magnetic material includes nano-scale Fe3O4 particles; the inert fluid carrier includes silicone oil; the proportion of the magnetic material in the magnetic fluid is 10% to 80%, preferably 30% to 50%.

[0009] Preferably, the present invention provides a movable combined door, wherein a pressure sensor is installed on the anti-collision rubber strip profile; when the anti-collision rubber strip is squeezed by external force, the magnetic fluid resumes flowing, and the power pump drives the magnetic fluid to flow in the thin-walled hollow support structure to form a buffer. When the door body is hit, each pressure sensor will detect the pressure value in real time, and form a liquid dynamic buffer by allowing the liquid to circulate at high speed. At the same time, the door body also gains a certain flexibility due to the flow of liquid. By accurately controlling the liquid parameters and flow rate, it can avoid human body pinching without reducing the safety during normal use.

[0010] Preferably, the present invention provides a movable combined door, wherein the pressure sensor is connected to a visual feedback system, and the visual feedback system is installed on the movable combined door to prompt the user through color images and / or sounds.

[0011] Preferably, the present invention provides a movable combined door, wherein a plurality of modules consisting of a main door and / or a secondary door are arranged in series to form a door group that can be moved and opened.

[0012] Preferably, the present invention provides a movable combined door, wherein the main door and / or the auxiliary door are fixed by a connecting block, and the distance between the main door and / or the auxiliary door is adjusted by changing the thickness of the connecting block. In different high-speed railway platforms, the distance between the main door and the auxiliary door may vary greatly according to the actual construction and use needs. By changing the thickness of the connecting block, dynamic adaptation to the application environment of the platform safety door can be achieved without affecting the overall structure, which has strong practical significance.

[0013] Preferably, in the movable combined door provided by the present invention, a rubber strip groove is provided on the side, front and / or rear of the anti-collision rubber strip profile, and the anti-collision rubber strip is inserted and fixed to wrap the anti-collision rubber strip profile. In some application scenarios, after the anti-collision rubber strip is inserted and fixed through the groove, the outside of the anti-collision rubber strip profile can be fully wrapped so that the profile is not exposed, thereby maximally ensuring that passengers will not be injured due to squeezing.

[0014] Preferably, the present invention provides a movable combined door, wherein a door gap brush profile is installed between the vertical door frame and the anti-collision rubber strip profile on the outside of the main door, a door gap brush is fixed on the door gap brush profile, and the length of the door gap brush matches the door gap brush profile to form a safety gap between the main door and the auxiliary doors in the front and rear modules. The door gap brush is provided in the present invention to prevent passengers from putting their fingers between the main door and the auxiliary door, causing unexpected injuries.

[0015] Preferably, the present invention provides a movable combined door, wherein the door gap brush profile is provided with a long waist hole, and moves between the vertical door frame and the anti-collision rubber strip profile on the outer side of the main door, so as to adjust the extension length of the door gap brush, and cooperate with the adjustment of the distance between the main door and / or the auxiliary door to form a safety gap to prevent people's fingers from being inserted. In actual application, the distance between the main door and the auxiliary door can be adjusted according to the on-site conditions of the door body installation by changing the thickness of the main door and the auxiliary door connecting block. After the distance between the main door and the auxiliary door is adjusted, the extension length of the door gap brush can be further adjusted by adjusting the relative position of the door gap brush profile. In some cases, the size of each gap of multiple continuous combined door modules can be kept consistent.

[0016] Preferably, the present invention provides a movable combined door, wherein the vertical door frame inside the main door and / or the auxiliary door is installed with a seam rubber strip profile, which is wrapped by the seam rubber strip, and the seam rubber strip extends and contacts between the main door and the auxiliary door to form a support rib, which is bent to cooperate with the adjustment of the distance between the main door and / or the auxiliary door to ensure that the inside of the main door and / or the auxiliary door is closed. In actual application, after adjusting the distance between the main door and the auxiliary door according to the on-site conditions of the door body installation, the support rib between the main door and the auxiliary door can be further bent counterclockwise to adapt to the change in spacing to keep the seam between the main door and the auxiliary door without a gap. The safety of the platform safety door in use is further improved, reducing accidental injuries to passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of a top view of a movable combined door module in an embodiment;

[0019] Figure 2 is a schematic diagram of a top view of a plurality of movable combined door modules in an embodiment;

[0020] Figure 3 2 is a schematic diagram of the structure of the main door viewed from the left side in the embodiment;

[0021] Figure 4 This is a schematic diagram of the top view of the connection and fixing of the main door and the auxiliary door in the embodiment;

[0022] Figure 5 2. It is a schematic diagram of the structure of the right side of the auxiliary door in the embodiment from a top view;

[0023] Figure 6 It is a schematic diagram of the structure of the plurality of movable combined door modules in the embodiment when the door body is closed, viewed from above at the joint between the main door and the auxiliary door;

[0024] Figure 7 Schematic diagram of the door gap brush profile structure in the embodiment.

[0025] Reference numerals:

[0026] 1. Main door, 2. Auxiliary door, 3. Connecting block, 4. Anti-collision rubber strip, 5. Anti-collision rubber strip profile, 6. Door gap brush profile, 7. Door gap brush, 8. Joint rubber strip profile, 9. Joint rubber strip. DETAILED DESCRIPTION

[0027] In order to further illustrate the present invention, embodiments are given below. It should be pointed out that these embodiments are purely illustrative. The purpose of providing these embodiments is to fully illustrate the significance and content of the present invention, but the present invention is not limited to the scope of the embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] Example 1

[0029] The present invention provides a movable combined door, wherein the movable combined door comprises one or more modules composed of a main door 1 and / or a secondary door 2, the main door 1 and / or the secondary door 2 are arranged in a front-to-back staggered manner and connected and fixed; a plurality of modules composed of the main door 1 and / or the secondary door 2 are arranged in a continuous manner to form a movable door group. In one embodiment, the main door 1 and / or the secondary door 2 are fixed by a connecting block 3, and the distance between the main door 1 and / or the secondary door 2 is adjusted by changing the thickness of the connecting block 3.

[0030] The outer vertical door frame of the main door 1 and / or the auxiliary door 2 is installed with an anti-collision rubber strip profile 5, and the anti-collision rubber strip 4 is fixed on the anti-collision rubber strip profile 5. In one embodiment, a rubber strip groove is provided on the side, front and / or rear of the anti-collision rubber strip profile 5, and the anti-collision rubber strip 4 is inserted and fixed to wrap the anti-collision rubber strip profile 5. In some application scenarios, after the anti-collision rubber strip 4 is inserted and fixed through the groove, the outside of the anti-collision rubber strip profile 5 can be fully wrapped so that the profile is not exposed, thereby maximally ensuring that passengers will not be injured due to squeezing.

[0031] In another embodiment, the outer side of the anti-collision rubber strip 4 is a thin-walled hollow bracket structure, in which a controllable magnetic fluid damper and / or a control circuit are installed, and the magnetic fluid damper includes magnetic fluid. The magnetic fluid includes magnetic material and / or an inert fluid carrier; the magnetic material includes nano-scale Fe3O4 particles; the inert fluid carrier includes silicone oil; the proportion of magnetic material in the magnetic fluid is 10% to 80%, preferably 30% to 50%.

[0032] Under normal conditions, the control circuit applies a strong magnetic field, the magnetic fluid maintains a high viscosity state, and the outer side of the anti-collision rubber strip 4 is rigid. A pressure sensor is installed on the anti-collision rubber strip profile 5. When the anti-collision rubber strip 4 is squeezed by an external force, the control circuit cuts off the magnetic field, the magnetic fluid restores fluidity, and the power pump drives the magnetic fluid to flow in the thin-walled hollow support structure to form a buffer, so that the outer side of the anti-collision rubber strip 4 can achieve flexible shock absorption. As a result, the anti-collision rubber strip 4 has shape retention when it is not subjected to external force. When it is squeezed by external force, the magnetic fluid flows inside it and can be deformed, and the deformation can be restored after the magnetic field is restored. The pressure sensor is connected to the visual feedback system, which is installed on the mobile combination door to prompt the user through color images and / or sounds.

[0033] When the door body encounters obstacles such as human bodies during closing, the thin-walled hollow bracket structure and the controllable magnetic fluid damper and / or the control circuit can buffer the impact force to avoid hitting pedestrians and damaging objects. The anti-collision rubber strip 4 has a good shape retention ability when not subjected to external force, and deforms when squeezed by external force, and has the ability to self-recover its shape. Therefore, when the left-right moving combined door moves to the left or right, the impact force on the human body can be reduced, and the user can be warned, thereby playing the role of anti-collision and anti-pinch.

[0034] A door gap brush profile 6 is installed between the vertical door frame on the outside of the main door 1 and the anti-collision rubber strip profile 5, and a door gap brush 7 is fixed on the door gap brush profile 6. The length of the door gap brush 7 matches the door gap brush profile 6 to form a safety gap between the main door 1 and the secondary door 2 in the front and rear modules. In one embodiment, the door gap brush profile 6 is provided with a long waist hole, and moves between the vertical door frame on the outside of the main door 1 and the anti-collision rubber strip profile 5, so as to adjust the extension length of the door gap brush 7, and cooperate with the adjustment of the distance between the main door 1 and / or the secondary door 2 to form a safety gap to prevent people's fingers from being inserted.

[0035] The vertical door frame inside the main door 1 and / or the auxiliary door 2 is installed with a joint rubber strip profile 8, which is wrapped by a joint rubber strip 9. The joint rubber strip 9 extends from the main door 1 to the auxiliary door 2 to form a support rib, which is bent to coordinate with the adjustment of the distance between the main door 1 and / or the auxiliary door 2 to ensure that the inside of the main door 1 and / or the auxiliary door 2 is closed. In actual application, after adjusting the distance between the main door 1 and the auxiliary door 2 according to the on-site conditions of the door body installation, the support rib between the main door 1 and the auxiliary door 2 can be further bent counterclockwise to adapt to the change in spacing to keep the joint between the main door 1 and the auxiliary door 2 without a gap.

[0036] Example 2

[0037] like Figure 1 As shown, a movable combined door module is composed of a main door 1 and a secondary door 2. The main door 1 and the secondary door 2 are connected and fixed together by a connecting block 3. The main door 1 and the secondary door 2 are connected in a staggered manner front to back. Figure 2 As shown, a plurality of movable combined door modules can be arranged continuously to form a continuously openable isolation barrier.

[0038] like Figure 3 As shown, the left vertical door frame of the main door 1 is installed with an anti-collision rubber strip profile 5 and a door gap brush profile 6. The door gap brush profile 6 is located between the anti-collision rubber strip profile 5 and the left vertical door frame of the main door 1. The lateral anti-collision rubber strip 4 is fixed on the anti-collision rubber strip profile 5 by interlacing. Figure 5 As shown, the vertical door frame on the right side of the auxiliary door 2 is installed with an anti-collision rubber strip profile 5, and the lateral anti-collision rubber strip 4 is fixed on the anti-collision rubber strip profile 5 by means of insertion.

[0039] like Figure 3 , 5 As shown, the vertical door frames on the left and right sides of the movable combined door module are provided with lateral anti-collision rubber strips 4, and when the door body moves to the left or right, it is the anti-collision rubber strips that contact obstacles such as pedestrians.

[0040] like Figure 3 As shown, the outer side of the anti-collision rubber strip 4 is a thin-walled hollow bracket structure, in which an intelligent controllable magnetic fluid damper and a control circuit are installed. Under normal circumstances, the control circuit applies a strong magnetic field, and the magnetic fluid is in a high viscosity state, so that the anti-collision rubber strip 4 maintains rigidity. Once an abnormal pressure such as 30N / cm is detected2 , the circuit cuts off the magnetic field, the magnetic fluid returns to a low viscosity state, and switches to a flexible damping mode. The magnetic fluid is made of a mixture of nano-sized Fe3O4 particles and silicone oil. The magnetic material accounts for 35% of the magnetic fluid, and the viscosity coefficient can be adjusted from 0.2 to 2.5 Pa·s. The damper size is 2cm*120cm, and the filling volume is 400ml. By precisely controlling the magnetic field, the mechanical properties of the door body can be quickly switched, making it both strong and flexible.

[0041] Attach pressure sensors to the safety door anti-collision rubber strip profile 5. The pressure sensors are arranged every 5 cm, with a sensitivity of 0.1 N / cm 2 . When the door body is hit, each pressure sensor will detect the pressure value in real time, cut off the magnetic field, and use a power pump to circulate the magnetic fluid at high speed. The flow rate of the magnetic fluid is about 0.5 m / s, forming a liquid dynamic buffer zone. At the same time, the anti-collision rubber strip 4 also gains a certain flexibility due to the flow of liquid. By precisely controlling the liquid parameters and flow rate, it can avoid human body pinching without reducing the safety during normal use. When the door body encounters obstacles such as pedestrians during the closing process, the lateral anti-collision rubber strip 4 with a thin-walled hollow bracket structure can buffer the impact force to avoid hitting pedestrians and damaging objects; the internal design is equipped with a thin-walled bracket, an intelligent controllable magnetic fluid damper and a control circuit. The anti-collision rubber strip 4 has a good shape retention ability when not subjected to external force, and it deforms when squeezed by external force, and has the ability to self-recover its shape.

[0042] At the same time, the visual feedback system displays the force situation on the door surface, alerting users in the form of color images and sounds. The system first uses visual warnings to avoid accidental pinching, and once it occurs, it can also reduce the degree of injury through a buffer layer.

[0043] like Figure 3 As shown, the side, front and back surfaces of the anti-collision rubber strip profile 5 are designed with rubber strip insertion channels. After the lateral anti-collision rubber strip 4 is fixed through the insertion channels, the lateral anti-collision rubber strip profile 5 is completely wrapped, and the profile is not exposed.

[0044] like Figure 3 , 7 As shown, one end face of the door gap brush profile 6 is designed with a brush fixing groove, and the door gap brush 7 is fixed to the door gap brush profile 6 by interlacing. The distance between the rear end of the door gap brush profile 6 and the outer edge of the door body is H1, and the distance between the front end and the outer edge of the anti-collision rubber strip profile 5 is H2. The door gap brush profile 6 is designed with a long waist hole, and the door gap brush profile 6 can be adjusted within the range of H1 and H2 according to the situation.

[0045] like Figure 6 As shown, when a plurality of continuous combined door modules form a blocking door body, the door gap brush 7 is used to form a blocking gap between the left end of the main door 1 and the right end of the front module auxiliary door 2 to prevent people from inserting their fingers into the door gap and pinching their fingers.

[0046] like Figure 2 , 6 As shown, the distance between the main door 1 and the auxiliary door 2 can be adjusted according to the door installation site conditions by changing the thickness of the connecting block 3. After the distance between the main door 1 and the auxiliary door 2 is adjusted, the gap H3 at the joint between the main door 1 and the auxiliary door 2 changes. By adjusting the door gap brush profile 6, the size of each gap between multiple continuous combined door modules can be kept consistent.

[0047] like Figure 1 , 4 As shown, the main door 1 and the secondary door 2 are connected in a front-to-back staggered manner, and the secondary door 2 is placed behind the main door 1. A joint rubber strip profile 8 is designed at the junction of the right vertical door frame of the main door 1 and the left vertical door frame of the secondary door 1. The joint rubber strip profile 8 is designed with rubber strip insertion channels on the side and front and back sides. After the joint rubber strip 9 is fixed to the joint rubber strip profile 8 through the insertion channel, the joint rubber strip profile 8 is completely wrapped, and the profile is not exposed.

[0048] like Figure 1 , 4 As shown, the joint rubber strip 9 extends and contacts between the main door 1 and the auxiliary door 2, forming an arc shape, and is designed as a supporting rib. When the distance between the main door 1 and the auxiliary door 2 is adjusted by changing the thickness of the connecting block 3, the gap H3 changes, and the joint rubber strip 9 can bend counterclockwise to adapt to the change of H3 and ensure that the joint is sealed without leaving a gap.

[0049] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A mobile combined door for a platform safety door, characterized in that: The movable combined door comprises one or more modules consisting of a main door and a secondary door, wherein the main door and the secondary door are arranged in a front-to-back staggered manner and are connected and fixed; the outer vertical door frames of the main door and the secondary door are installed with anti-collision rubber strip profiles, and the anti-collision rubber strip profiles are fixed with anti-collision rubber strips; The outer side of the anti-collision rubber strip is a thin-walled hollow bracket structure, in which a controllable magnetic fluid damper and a control circuit are installed, and the magnetic fluid damper includes magnetic fluid; under normal conditions, the control circuit applies a strong magnetic field, the magnetic fluid maintains a high viscosity state, and the outer side of the anti-collision rubber strip exhibits rigidity; when the anti-collision rubber strip is squeezed by external force, the control circuit cuts off the magnetic field, the magnetic fluid resumes flowing, and the outer side of the anti-collision rubber strip achieves flexible shock absorption.

2. The movable combined door according to claim 1, characterized in that: The magnetic fluid comprises magnetic material and inert fluid carrier; the magnetic material comprises nanometer-level Fe3O4 particles; the inert fluid carrier comprises silicone oil; the magnetic material accounts for 10% to 80% of the magnetic fluid.

3. The movable combined door according to claim 2, characterized in that: The magnetic material accounts for 30% to 50% of the magnetic fluid.

4. The movable combined door according to claim 1, characterized in that: A pressure sensor is installed on the anti-collision rubber strip profile; when the anti-collision rubber strip is squeezed by external force, the magnetic fluid resumes flowing, and the power pump drives the magnetic fluid to flow in the thin-walled hollow bracket structure to form a buffer.

5. The movable combined door according to claim 4, characterized in that: The pressure sensor is connected to a visual feedback system, and the visual feedback system is installed on the movable combined door to prompt the user through color images and / or sounds.

6. The movable combined door according to claim 1, characterized in that: The multiple modules consisting of main doors and auxiliary doors are arranged in succession to form a door group that can be moved and opened.

7. The movable combined door according to claim 1, characterized in that: The main door and the auxiliary door are fixed by a connecting block, and the distance between the main door and the auxiliary door can be adjusted by changing the thickness of the connecting block.

8. The movable combined door according to claim 1, characterized in that: The side, front and / or rear of the anti-collision rubber strip profile is provided with a rubber strip groove, and the anti-collision rubber strip is inserted and fixed to wrap the anti-collision rubber strip profile.

9. The movable combined door according to claim 1, characterized in that: A door gap brush profile is installed between the vertical door frame on the outer side of the main door and the anti-collision rubber strip profile, and a door gap brush is fixed on the door gap brush profile. The length of the door gap brush matches the door gap brush profile to form a safety gap between the main door and the secondary doors in the front and rear modules.

10. The movable combined door according to claim 9, characterized in that: The door gap brush profile is provided with a long waist hole, which moves between the vertical door frame and the anti-collision rubber strip profile outside the main door, so as to adjust the extension length of the door gap brush, and cooperate with the adjustment of the distance between the main door and the auxiliary door to form a safety gap to prevent people's fingers from entering.

11. The movable combined door according to claim 1, characterized in that: The vertical door frames inside the main door and the secondary door are installed with seam strip profiles and wrapped by the seam strips. The seam strips extend and contact between the main door and the secondary door to form support ribs, which bend and cooperate with the adjustment of the distance between the main door and the secondary door to ensure that the inner sides of the main door and the secondary door are closed.

Images