Non-pressure air door system for connection roadway

Abstract

The utility model relates to a non-pressure air door system for a connection roadway, which is characterized in that a first door for isolating a main air way and a second door for isolating a return air way are arranged in the connection roadway, and the first door and the second door are respectively fixed on a pair of buttress walls and are connected through an interlocking mechanism; the first door and the second door are composed of a left door leaf and a right door leaf which are horizontally opened, a left push rod mechanism is arranged on the left door leaf, a right push rod mechanism is arranged on the right door leaf, and the left push rod mechanism and the right push rod mechanism are connected through a connecting rod assembly so that the left door leaf and the right door leaf can rotate clockwise at the same time. The system is ingenious in design and simple in structure, the interlocking mechanism adopts the combination of a pulley block and a weight box, thrust generated during door opening is converted into potential energy to be stored, the doors are automatically closed, meanwhile, an interlocking push rod mechanism is adopted, non-pressure air doors on the two sides cannot be opened at the same time, and the non-pressure air doors can be automatically closed when people leave; the ventilation loop is not short-circuited when people or equipment locomotives pass through the connection roadway, and safety and reliability are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine facility safety technology, specifically relating to a pressureless air door system for connecting roadways. Background Technology

[0002] The connecting roadway between the main ventilation roadway and the return air roadway in a coal mine serves to control airflow direction, prevent fire spread, ensure the stable operation of the ventilation system, and guarantee the safe passage of personnel and vehicles. In emergencies, personnel can evacuate quickly, achieving a dual improvement in ventilation efficiency and safe operation. The pressure-free air doors on both sides of the connecting roadway must have reliable interlocking mechanisms to ensure that when entering the connecting roadway from the return air roadway or from the main ventilation roadway, the two pressure-free air doors cannot open simultaneously, preventing short circuits that could lead to insufficient underground air supply, increased methane concentration at the coal mine working face, and safety hazards. Currently, the pressure-free air doors used in coal mining enterprises generally employ spring or hinge mechanisms for their interlocking, which are complex in structure and inconvenient to manufacture and maintain. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pressureless air door system for connecting roadways.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a pressureless air door system for connecting roadways, including a connecting roadway located between the main airway and the return airway, with a pair of pier walls vertically installed at both ends of the connecting roadway walls on both sides; characterized in that: a No. 1 door is provided in the connecting roadway to isolate the main airway and a No. 2 door to isolate the return airway, the No. 1 door and the No. 2 door are respectively fixed to a pair of pier walls and connected by an interlocking mechanism, so that the No. 1 door and the No. 2 door cannot be opened at the same time;

[0005] Door No. 1 and Door No. 2 have the same structure, both consisting of a swing-out left door and a right door. The upper part of the left door is equipped with a left push rod mechanism, and the upper part of the right door is equipped with a right push rod mechanism. The left and right push rod mechanisms are connected by a linkage assembly, enabling the left and right doors to rotate clockwise simultaneously.

[0006] The interlocking mechanism includes a first guide wheel fixed on the wall of the connecting lane near the return air lane, a second guide wheel fixed on the wall of the connecting lane near the main air lane, and a mechanism box fixed on the lane wall between the first guide wheel and the second guide wheel. The mechanism box is equipped with a first pulley and a second pulley connected by an interlocking shaft located in the middle.

[0007] One end of the wire rope is fixed to the left push rod mechanism on the left side of the No. 1 door, then passes around the first guide wheel, enters the mechanism box, passes around the first pulley, then exits the mechanism box, passes around the movable pulley with the counterweight box, passes around the second pulley, and finally exits the mechanism box, passes around the second guide wheel. The other end of the wire rope is fixed to the right push rod mechanism on the right side of the No. 2 door.

[0008] The left push rod mechanism includes a left base plate fixed to the left door, a fixing plate vertically welded to the middle of the surface of the left base plate, and a left shaft perpendicular to the ground fixed to the end of the fixing plate;

[0009] The right push rod mechanism includes a right base plate fixed to the right door, a connecting plate fixed to the surface of the right base plate, the connecting plate extending out of the right door, and the outer end of the connecting plate being fixedly connected to a right axis perpendicular to the ground; the connecting plate is shaped like a "7", with an included angle between the two sides greater than 90 degrees.

[0010] The connecting rod assembly includes an intermediate rod with internally threaded holes at both ends. One end of the intermediate rod is threadedly connected to the first connecting rod head and fixed by two nuts. The other end of the intermediate rod is threadedly connected to the second connecting rod head. The outer end of the first connecting rod head is rotatably connected to the left shaft, and the outer end of the second connecting rod head is rotatably connected to the right shaft.

[0011] The fixed plate has a circular hole for connecting the left shaft at one end away from the left base plate. The left shaft has a stepped shaft platform at its end. The left shaft is inserted into the circular hole and fixed by welding after being limited by the stepped shaft platform.

[0012] The connecting plate has a circular hole for connecting the right shaft at one end that protrudes from the right door. The right shaft has a stepped shaft platform at its end. The right shaft is inserted into the circular hole and fixed by welding after being limited by the stepped shaft platform.

[0013] The fixing plate has a left stiffening plate welded in the middle, and the end of the left stiffening plate is fixed to the left shaft; the connecting plate has a right stiffening plate welded in the middle, and the end of the right stiffening plate is fixed to the right shaft; this is used to enhance the connection rigidity and prevent deformation in strong winds.

[0014] The first connecting rod head has a flat surface milled at one end, with a round hole for connecting to the left shaft on the flat surface, and an external thread machined at the other end for connecting to and adjusting the intermediate rod; the second connecting rod head has a flat surface milled at one end, with a round hole for connecting to the right shaft on the flat surface, and an external thread machined at the other end for connecting to the intermediate rod.

[0015] The first connecting rod head with external threads is fitted with two nuts and then partially screwed into the internal threaded hole at one end of the middle rod. The length of the connecting rod assembly is adjusted by the length of screwing in, thereby adjusting the tightness of the left and right doors. After adjustment, it is fixed with two nuts.

[0016] The left door is rotatably connected to one side of the door frame via two sets of rotating components, and the right door is rotatably connected to the other side of the door frame via two sets of rotating components; multiple fixing rods for installation and fixing with the wall are provided on the outer side of the door frame, and stiffening plates are provided at the two lower corners of the door frame;

[0017] The rotating assembly connecting the left door is located on the front of the left door, and the rotating assembly connecting the right door is located on the back of the right door.

[0018] The rotating assembly includes a base plate fixed to the left or right door, an upper shaft seat fixed to the base plate, and a lower shaft seat fixed to the door frame; the center holes of the upper and lower shaft seats are concentric and perpendicular to the horizontal plane, and a shaft pin passes through the center holes of the upper and lower shaft seats and is rotatably connected to them.

[0019] A sealing component is provided on the front of the left door, near the side of the right door; a sealing component is also provided on the top of the door frame near the back of the left door; and a sealing component is also provided on the top of the door frame near the front of the right door.

[0020] The sealing assembly includes a P-shaped sealing strip;

[0021] The left door has a first left guard edge on its front side, and a P-shaped sealing strip is fixed to the right door side of the first left guard edge with screws via a connector. The top of the door frame has a second left guard edge on its back side near the left door side, and the P-shaped sealing strip is fixed to the second left guard edge with screws via a connector. The top of the door frame has a first right guard edge on its front side near the right door side, and the P-shaped sealing strip is fixed to the first right guard edge with screws via a connector. The back of the right door has a second right guard edge, and the end of the second right guard edge near the left door contacts the P-shaped sealing strip fixed to the front of the left door side, thus providing a sealing function.

[0022] The interlocking shaft includes a bushing with a pin inside, allowing the pin to slide within the bushing. The first and second pulleys have opposing notches milled on their disc edges, and the two ends of the pin engage with these notches to achieve interlocking between the first and second pulleys.

[0023] The beneficial effects of this utility model are as follows: The system is ingeniously designed and has a simple structure. The interlocking mechanism of the pressureless air doors on both sides of the connecting tunnel adopts a combination of pulley blocks and counterweight boxes, which converts the pushing force when opening the door into potential energy storage. Under the action of potential energy, the door closes automatically. At the same time, the interlocking push rod mechanism prevents the pressureless air doors on both sides from opening simultaneously, and it can automatically close when a person leaves. P-type sealing strips are used to seal between the double door leaves and between the door leaves and the door frame, which has a good sealing effect and also has a buffering effect to prevent sparks caused by collisions. It ensures that the ventilation circuit does not short-circuit when people or equipment locomotives pass through the connecting tunnel, making it safe and reliable. Attached Figure Description

[0024] Figure 1 This is the front view of this utility model;

[0025] Figure 2 This is a top view of the present invention;

[0026] Figure 3 This is a front view of Gate No. 1 or Gate No. 2 involved in this utility model;

[0027] Figure 4This is a top view of either Gate 1 or Gate 2, which is involved in this utility model;

[0028] Figure 5 This is a schematic diagram of the linkage assembly;

[0029] Figure 6 This is a schematic diagram of the open state of the No. 1 or No. 2 door involved in this utility model;

[0030] Figure 7 yes Figure 4 Enlarged view of section D in the middle;

[0031] Figure 8 yes Figure 4 Enlarged view of section E in the middle;

[0032] Figure 9 yes Figure 4 Enlarged view of section F in the middle;

[0033] In the diagram, 1-Door No. 1, 1a-Left leaf of Door No. 1, 1b-Right leaf of Door No. 1, 2-Door No. 2, 2a-Left leaf of Door No. 2, 2b-Right leaf of Door No. 2, 3-First guide wheel, 4-Second guide wheel, 5-Mechanism box, 51-First pulley, 52-Second pulley, 53-Interlocking shaft; 6-Left push rod mechanism, 61-Left shaft, 62-Fixing plate, 63-Left base plate, 64-Left stiffening plate; 7-Right push rod mechanism, 71-Right shaft, 72-Connecting plate, 73-Right base plate, 74-Right stiffening plate; 8-Linkage assembly, 81-First link head, 82-Second link head, 83-Intermediate rod, 84-Nut; 9-Counterweight box, 10-Moving pulley, 11-Wire rope. 12-Connecting lane wall, 13-Button wall, 14-Door frame, 15-Fixing rod, 16-Rotating assembly, 161-Upper shaft seat, 162-Lower shaft seat, 163-Shaft pin, 17-Firming plate, 18-P-shaped sealing strip; A-Left door, A1-First left guard edge, A2-Second left guard edge; B-Right door, B1-First right guard edge, B2-Second right guard edge. Detailed Implementation

[0034] See Figure 1-2 A pressureless air door system for connecting roadways includes a connecting roadway located between the main airway and the return airway, with a pair of retaining walls 13 vertically installed at both ends of the connecting roadway walls 12 on both sides; characterized in that: a No. 1 door 1 is provided in the connecting roadway to isolate the main airway and a No. 2 door 2 to isolate the return airway, the No. 1 door 1 and the No. 2 door 2 are respectively fixed on a pair of retaining walls 13 and connected by an interlocking mechanism, so that the No. 1 door 1 and the No. 2 door 2 cannot be opened at the same time;

[0035] The interlocking mechanism includes a first guide wheel 3 fixed on the wall 12 of the connecting lane near the return air lane, a second guide wheel 4 fixed on the wall 12 of the connecting lane near the main air lane, and a mechanism box 5 fixed on the lane wall 12 between the first guide wheel 3 and the second guide wheel 4. The mechanism box 5 is provided with a first pulley 51 and a second pulley 52 connected by an interlocking shaft 53 located in the middle.

[0036] The interlocking shaft 53 includes a bushing, in which a pin is fitted, allowing the pin to slide within the bushing; the first pulley 51 and the second pulley 52 have opposing notches milled on their disc edges, and the two ends of the pin contact and engage with the notches to achieve interlocking between the first pulley 51 and the second pulley 52.

[0037] One end of the wire rope 11 is fixed to the left push rod mechanism 6 on the left leaf 1a of the first door, then passes around the first guide wheel 3, enters the mechanism box 5, passes around the first pulley 51, then exits the mechanism box 5, passes around the movable pulley 10 with the counterweight box 9, passes around the second pulley 52, and finally exits the mechanism box 5, passes around the second guide wheel 4. The other end of the wire rope 11 is fixed to the right push rod mechanism 7 on the right leaf 2b of the second door.

[0038] See Figure 3-4 The No. 1 door and the No. 2 door have the same structure, both consisting of a swing-open left door A and a right door B. The upper part of the left door A is provided with a left push rod mechanism 6, and the upper part of the right door B is provided with a right push rod mechanism 7. The left push rod mechanism 6 and the right push rod mechanism 7 are connected by a connecting rod assembly 8, so that the left door A and the right door B can rotate clockwise at the same time.

[0039] The left door A is rotatably connected to one side of the door frame 14 via two sets of rotating components 16, and the right door B is rotatably connected to the other side of the door frame 14 via two sets of rotating components 16; multiple fixing rods 15 for installation and fixing with the wall 13 are provided on the outer side of the door frame 14, and stiffening plates 17 are provided at the two lower corners of the door frame 14.

[0040] The rotating assembly 16 connecting the left door A is located on the front of the left door A, and the rotating assembly 16 connecting the right door B is located on the back of the right door B.

[0041] The rotating assembly 16 includes a base plate 164 fixed to the left door A or the right door B, an upper shaft seat 161 fixed to the base plate 164, and a lower shaft seat 162 fixed to the door frame 14; the center holes of the upper shaft seat 161 and the lower shaft seat 162 are concentric and perpendicular to the horizontal plane, and the shaft pin 163 passes through the center holes of the upper shaft seat 161 and the lower shaft seat 162 and is rotatably connected to them.

[0042] The left push rod mechanism 6 includes a left bottom plate 63 fixed on the left door A, a fixing plate 62 vertically welded in the middle of the surface of the left bottom plate 63, and a left shaft 61 perpendicular to the ground fixed at the end of the fixing plate 62.

[0043] The fixed plate 62 has a round hole for connecting the left shaft 61 at the end away from the left bottom plate 63. The left shaft 61 has a stepped shaft platform at the shaft end. The left shaft 61 is inserted into the round hole and fixed by welding after being limited by the stepped shaft platform.

[0044] The fixing plate 62 is welded to the middle of the left stiffening plate 64, and the end of the left stiffening plate 64 is fixed to the left shaft 61.

[0045] The right push rod mechanism 7 includes a right base plate 73 fixed on the right door B. A connecting plate 72 is fixed on the surface of the right base plate 73. The connecting plate 72 extends out of the right door B. The outer end of the connecting plate 72 is fixedly connected to a right shaft 71 perpendicular to the ground. The connecting plate 72 is shaped like the number "7". The included angle between the two sides is greater than 90 degrees.

[0046] The connecting plate 72 has a circular hole for connecting the right shaft 71 at one end that protrudes from the right door B. The right shaft 71 has a stepped shaft platform at its shaft end. The right shaft 71 is inserted into the circular hole and fixed by welding after being limited by the stepped shaft platform.

[0047] The connecting plate 72 is welded with a right stiffening plate 74 in the middle, and the end of the right stiffening plate 74 is fixed to the right shaft 71; this is used to enhance the connection rigidity and prevent deformation in strong winds.

[0048] See Figure 5 The connecting rod assembly 8 includes an intermediate rod 83 with internal threaded holes at both ends. One end of the intermediate rod 83 is threadedly connected to the first connecting rod head 81 and adjusted and fixed by two nuts 84. The other end of the intermediate rod 83 is threadedly connected to the second connecting rod head 82. The outer end of the first connecting rod head 81 is rotatably connected to the left shaft 61, and the outer end of the second connecting rod head 82 is rotatably connected to the right shaft 71.

[0049] The first connecting rod head 81 has a flat surface milled at one end, with a round hole for connecting to the left shaft 61 on the flat surface, and an external thread machined at the other end for connecting to and adjusting the intermediate rod 83; the second connecting rod head 82 has a flat surface milled at one end, with a round hole for connecting to the right shaft 71 on the flat surface, and an external thread machined at the other end for connecting to the intermediate rod 83.

[0050] The first connecting rod head 81 with external threads is fitted with two nuts 84 and then partially screwed into the internal threaded hole at one end of the middle rod 83. The length of the connecting rod assembly 8 is adjusted by the length of screwing in, thereby adjusting the closing tightness of the left door A and the right door B. After adjustment, it is fixed with two nuts 84.

[0051] See Figure 7-9 A P-shaped sealing strip 18 is provided on the front of the left door A and on the side near the right door B; a P-shaped sealing strip 18 is also provided on the top of the door frame 14 near the back of the left door A; a P-shaped sealing strip 18 is also provided on the top of the door frame 14 near the front of the right door B.

[0052] The front of the left door A is provided with a first left guard A1, and the end of the first left guard A1 near the right door B is fixed with a P-shaped sealing strip 18 by screws through a connector; the top of the door frame 14 is provided with a second left guard A2 near the back of the left door A, and the P-shaped sealing strip 18 is fixed to the second left guard A2 by screws through a connector.

[0053] A first right guard edge B1 is provided on the front of the door frame 14 near the right door B. A P-shaped sealing strip 18 is fixed to the first right guard edge B1 by screws through a connector. A second right guard edge B2 is provided on the back of the right door B. The end of the second right guard edge B2 near the left door A contacts the P-shaped sealing strip 18 fixed on the front of the left door A, thus playing a sealing role.

[0054] Before use, the wire rope 11 is passed around the first pulley 51 and the second pulley 52 respectively, so that the notches on the edges of the first pulley 51 and the second pulley 52 are horizontally opposite each other, and the interlocking shaft 53 is located between the notches.

[0055] The following example illustrates the usage method using the method of entering the connecting tunnel from the main ventilation tunnel. (See below) Figure 6 .

[0056] Pushing the right leaf 2b of Gate 2 clockwise to 90° (i.e., Gate 2's right leaf 2b rotates into the connecting tunnel), under the action of the connecting rod assembly 8, the left leaf 2a of Gate 2 also rotates 90° clockwise (i.e., Gate 2's left leaf 2a rotates back into the main air tunnel). The counterweight box 9 is lifted to a certain height by the wire rope 11, storing energy. The second pulley 52 rotates under the drive of the wire rope 11 until it moves away from the interlocking shaft 53 through the notch on it. Then, the disc surface of the second pulley 52 presses against the interlocking shaft. Shaft 53 prevents the interlocking shaft 53 from rotating. The other end of the interlocking shaft 53 is pressed against the notch of the first pulley 51 disc, so the first pulley 51 also cannot rotate. The wire rope 11 cannot pull the left push rod mechanism 6 on the left leaf 1a of the first door, so the left leaf 1a of the first door cannot be opened. Due to the linkage of the left push rod mechanism 6 on the left leaf 1a of the first door, the connecting rod assembly 8, and the right push rod mechanism 7 on the right leaf 1b of the first door, the right leaf 1b of the first door cannot be opened.

[0057] When a person enters the connecting alley, the counterweight box 9 descends under the action of gravity, and pulls the right push rod mechanism 7 on the right leaf 2b of the second door through the steel wire rope 11, so that the right leaf 2b of the second door closes. At the same time, the left leaf 2a of the second door also closes.

Claims

1. A pressureless air door system for connecting roadways, comprising a connecting roadway located between the main airway and the return airway, wherein a pair of purlins (13) are vertically installed at both ends of the connecting roadway wall (12) on both sides of the connecting roadway; characterized in that: The connecting alley is equipped with a No. 1 gate (1) that isolates the main airway and a No. 2 gate (2) that isolates the return airway. The No. 1 gate (1) and the No. 2 gate (2) are respectively fixed on a pair of pier walls (13) and connected by an interlocking mechanism so that the No. 1 gate (1) and the No. 2 gate (2) cannot be opened at the same time. Door No. 1 (1) and Door No. 2 (2) have the same structure, both consisting of a swing-out left door (A) and a right door (B). The left door (A) is equipped with a left push rod mechanism (6) on its upper part, and the right door (B) is equipped with a right push rod mechanism (7) on its upper part. The left push rod mechanism (6) and the right push rod mechanism (7) are connected by a connecting rod assembly (8) to enable the left door (A) and the right door (B) to rotate clockwise simultaneously. The interlocking mechanism includes a first guide wheel (3) fixed on the wall (12) of the connecting lane near the return air lane, a second guide wheel (4) fixed on the wall (12) of the connecting lane near the main air lane, and a mechanism box (5) fixed on the wall (12) between the first guide wheel (3) and the second guide wheel (4). The mechanism box (5) is provided with a first pulley (51) and a second pulley (52) connected by an interlocking shaft (53) located in the middle. One end of the wire rope (11) is fixed to the left push rod mechanism (6) on the left leaf (1a) of the No. 1 door, then passes over the first guide wheel (3), passes through the mechanism box (5), passes over the first pulley (51), then passes out of the mechanism box (5), passes over the movable pulley (10) with the counterweight box (9), passes over the second pulley (52), and finally passes out of the mechanism box (5), passes over the second guide wheel (4). The other end of the wire rope (11) is fixed to the right push rod mechanism (7) on the right leaf (2b) of the No. 2 door.

2. The pressureless airlock system for connecting roadways as described in claim 1, characterized in that: The left push rod mechanism (6) includes a left bottom plate (63) fixed on the left door (A), a fixing plate (62) vertically welded in the middle of the surface of the left bottom plate (63), and a left shaft (61) perpendicular to the ground fixed at the end of the fixing plate (62). The right push rod mechanism (7) includes a right bottom plate (73) fixed on the right door (B), a connecting plate (72) fixed on the surface of the right bottom plate (73), the connecting plate (72) protruding outside the right door (B), and the outer end of the connecting plate (72) being fixedly connected to a right shaft (71) perpendicular to the ground; the connecting plate (72) is shaped like the number "7", and the included angle between the two sides is greater than 90 degrees; The connecting rod assembly (8) includes an intermediate rod (83) with internal threaded holes at both ends. One end of the intermediate rod (83) is threadedly connected to the first connecting rod head (81) and adjusted and fixed by two nuts (84). The other end of the intermediate rod (83) is threadedly connected to the second connecting rod head (82). The outer end of the first connecting rod head (81) is rotatably connected to the left shaft (61), and the outer end of the second connecting rod head (82) is rotatably connected to the right shaft (71).

3. A pressureless airlock system for connecting roadways as described in claim 2, characterized in that: The fixed plate (62) has a round hole for connecting the left shaft (61) at one end away from the left bottom plate (63). The left shaft (61) has a stepped shaft platform at its shaft end. The left shaft (61) is inserted into the round hole and fixed by welding after being limited by the stepped shaft platform. The connecting plate (72) has a circular hole for connecting the right shaft (71) at one end that protrudes from the right door (B). The right shaft (71) has a stepped shaft platform at its end. The right shaft (71) is inserted into the circular hole and fixed by welding after being limited by the stepped shaft platform.

4. A pressureless airlock system for connecting roadways as described in claim 2, characterized in that: The fixing plate (62) has a left stiffening plate (64) welded in the middle, and the end of the left stiffening plate (64) is fixed to the left shaft (61); the connecting plate (72) has a right stiffening plate (74) welded in the middle, and the end of the right stiffening plate (74) is fixed to the right shaft (71); this is used to enhance the connection rigidity and prevent large deformation in the wind.

5. A pressureless airlock system for connecting roadways as described in claim 2, characterized in that: The first connecting rod head (81) has a flat surface milled at one end, with a round hole for connecting with the left shaft (61) on the flat surface, and an external thread machined at the other end for connecting and adjusting with the intermediate rod (83); the second connecting rod head (82) has a flat surface milled at one end, with a round hole for connecting with the right shaft (71) on the flat surface, and an external thread machined at the other end for connecting with the intermediate rod (83); The first connecting rod head (81) with external threads is fitted with two nuts (84) and then partially screwed into the internal thread hole at one end of the middle rod (83). The length of the connecting rod assembly (8) is adjusted by the length of screwing in, thereby adjusting the tightness of the left door (A) and the right door (B). After adjustment, it is fixed with two nuts (84).

6. A pressureless airlock system for connecting roadways as described in claim 1, characterized in that: The left door (A) is rotatably connected to one side of the door frame (14) by two sets of rotating components (16), and the right door (B) is rotatably connected to the other side of the door frame (14) by two sets of rotating components (16); multiple fixing rods (15) for installation and fixing with the wall (13) are provided on the outside of the door frame (14), and stiffening plates (17) are provided at the two corners below the door frame (14); the rotating component (16) connecting the left door (A) is located on the front of the left door (A), and the rotating component (16) connecting the right door (B) is located on the back of the right door (B).

7. A pressureless airlock system for connecting roadways as described in claim 6, characterized in that: The rotating assembly (16) includes a base plate (164) fixed to the left door (A) or the right door (B), an upper shaft seat (161) fixed to the base plate (164), and a lower shaft seat (162) fixed to the door frame (14); the center holes of the upper shaft seat (161) and the lower shaft seat (162) are concentric and perpendicular to the horizontal plane, and the shaft pin (163) passes through the center holes of the upper shaft seat (161) and the lower shaft seat (162) and is rotatably connected to them.

8. A pressureless airlock system for connecting roadways as described in claim 1, characterized in that: A sealing component is provided on the front of the left door (A) and on the side near the right door (B); a sealing component is also provided on the back of the door frame (14) near the left door (A); a sealing component is also provided on the front of the door frame (14) near the right door (B).

9. A pressureless airlock system for connecting roadways as described in claim 8, characterized in that: The sealing assembly includes a P-shaped sealing strip (18); the front of the left door (A) is provided with a first left guard (A1), and the end of the first left guard (A1) near the right door (B) is fixed with the P-shaped sealing strip (18) by screws through a connector; the back of the door frame (14) near the left door (A) is provided with a second left guard (A2), and the P-shaped sealing strip (18) is fixed with the second left guard (A2) by screws through a connector; the front of the door frame (14) near the right door (B) is provided with a first right guard (B1), and the P-shaped sealing strip (18) is fixed with the first right guard (B1) by screws through a connector; the back of the right door (B) is provided with a second right guard (B2), and the end of the second right guard (B2) near the left door (A) is in contact with the P-shaped sealing strip (18) fixed on the front of the left door (A) to achieve a sealing effect.

10. A pressureless airlock system for connecting roadways as described in claim 1, characterized in that: The interlocking shaft (53) includes a bushing with a pin inside, allowing the pin to slide within the bushing; the first pulley (51) and the second pulley (52) have opposing notches milled on their disc edges, and the two ends of the pin contact and engage with the notches to achieve interlocking between the first pulley (51) and the second pulley (52).

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