Passenger protection device for rail transit shielding door

Abstract

The present application relates to rail transit equipment technical field, specifically, a kind of rail transit shield door passenger protection device, including fixed frame body, the fixed frame body inside left and right two sides inside symmetry is equipped with main door body, the main door body inside is equipped with anti-pinch door, the anti-pinch door one end extends in the main door body inner cavity, the main door body inside is equipped with for transmitting pressure to adjust the speed control mechanism of main door body movement, by the anti-pinch door of main door body in advance forming safety barrier, avoid main door body rigid closure pinch passenger, by pressure grading speed regulation, on the one hand, avoid pressure too big foreign matter deformation or door body structure damage, while more time can be reserved for main door body closure, facilitate passenger or station staff to handle card stagnation foreign matter, on the other hand, avoid the loss of operating efficiency caused by "one-size-fits-all" deceleration, effectively avoid hard extrusion injury, further improve the safety of device.

Description

Technical Field

[0001] This invention relates to the field of rail transit equipment technology, and more specifically, to a passenger protection device for rail transit platform screen doors. Background Technology

[0002] Platform screen doors, also known as platform curtain doors or safety doors, are glass curtain walls that enclose the subway platform and the space for trains to board and alight. When a train arrives, the screen doors open to allow passengers to board and alight, preventing accidents on the platform. As a safety barrier between the platform and the tracks, the anti-pinch protection of platform screen doors in rail transit is the core function of ensuring passenger safety.

[0003] Currently, anti-pinch protection mechanisms control the main door based on pressure feedback when the door is closed or almost closed. When a foreign object is caught, most actions are to stop closing the door, and very few have a retraction function. When encountering a slender object, such as a finger, although the command is issued, there will be a certain time difference between the execution and the actual execution. This results in the finger being continuously squeezed before the door stops closing or retraction, which will undoubtedly cause further damage to the finger. Summary of the Invention

[0004] The purpose of this invention is to provide a passenger protection device for rail transit platform screen doors, in order to solve the problem that traditional anti-pinch protection mechanisms in the above-mentioned background art may still cause injury to passengers through passive and continuous squeezing during the process of sensing foreign objects and providing protection.

[0005] To achieve the above objectives, the present invention first provides a passenger protection device for rail transit platform screen doors, including a fixed frame, with main door bodies symmetrically arranged on the left and right sides inside the fixed frame, and an anti-pinch door arranged inside the main door body, with one end of the anti-pinch door extending out of the inner cavity of the main door body;

[0006] The main gate body is equipped with a speed control mechanism inside, which transmits pressure to adjust the moving speed of the main gate body, wherein:

[0007] The speed control mechanism includes a lifting mechanism, a connecting plate, a squeezing rod, a primary spring, and a pressure sensing strip connected sequentially to the other end of the anti-pinch door, wherein the pressure sensing strip is fixed to the end of the main door body cavity for collecting resistance.

[0008] The two ends of the primary spring are fixedly connected between the extrusion rod and the pressure acquisition strip to form the initial resistance sensing;

[0009] The outer surface of the pressure sensing strip is also provided with a secondary spring. The primary spring and the secondary spring form a secondary resistance sensing, and the resistance of the secondary resistance sensing is greater than that of the primary resistance sensing.

[0010] The beneficial effects of this invention are:

[0011] If a foreign object gets caught between the two anti-pinch doors, the first-level spring is squeezed first, and the closing speed of the main door is slightly reduced based on the pressure data of the first-level spring. Then, the second-level spring is squeezed, and the moving speed of the main door is reduced again based on the pressure data of the second-level spring. This avoids the loss of operational efficiency caused by "one-size-fits-all" deceleration. When the pressure threshold exceeds the clamping force threshold of the anti-pinch door, the lifting mechanism pulls the anti-pinch door backward without resistance, so that the clamping force disappears and avoids hard squeezing injury.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Preferably, the number of compression rods is equal to the sum of the number of primary springs and secondary springs;

[0014] One portion of the compression rod is fixedly connected to the primary spring;

[0015] During secondary buffer protection, another part of the compression rod abuts against the secondary spring.

[0016] The beneficial effect of adopting the above-mentioned further solution is to achieve stable graded transmission of pressure, and at the same time, to ensure accurate acquisition of pressure data at different positions according to the different clamping positions of foreign objects.

[0017] Preferably, several primary and secondary springs are provided and are fixedly connected to one side of the pressure acquisition strip in an alternating arrangement from top to bottom.

[0018] The advantages of adopting the above-mentioned further solution are that the alternating arrangement allows the pressure at different height positions of the anti-pinch door to be detected (such as a hand being pinched at the top or luggage being pinched at the bottom), avoiding the sensing blind spot caused by the absence of a single spring. Furthermore, when a single spring fails, the adjacent springs can still work normally, avoiding the failure of the anti-pinch function due to local spring failure and improving reliability.

[0019] Preferably, the inner cavity of the main door body is provided with a first groove and a second groove;

[0020] The anti-pinch door and the connecting plate are adapted to slide inside the first groove;

[0021] The pressure sensing strip is fixedly connected to the side of the second groove away from the first groove;

[0022] The diameters of the primary and secondary springs are adapted to the internal width of the second groove.

[0023] The beneficial effect of adopting the above-mentioned further solutions is to ensure the continuity and stability of the transmission between structures.

[0024] Preferably, a plurality of limiting cylinders are provided between the first groove and the second groove, and the plurality of extrusion rods are interlocked with the plurality of limiting cylinders, wherein the inner diameter of the limiting cylinders is adapted to the outer diameter of the extrusion rods.

[0025] The advantages of adopting the above-mentioned further solution are that it can accurately limit the movement direction of the extrusion rod, avoid radial deviation, and prevent spring deformation or stiffness failure. At the same time, it can ensure that the spring compression and pressure are linearly related, and avoid distortion of the pressure acquisition bar detection data due to deviation.

[0026] Preferably, the housing of the lifting mechanism is fixed to the outer surface of the connecting plate, the piston rod of the lifting mechanism is fixed to the end of the anti-pinch door, and the lifting mechanism is used to partially drive the anti-pinch door to slide into the inner cavity of the main door body.

[0027] The beneficial effect of adopting the above-mentioned further solution is that the timely activation of the lifting mechanism facilitates the rapid adjustment of the position of the anti-pinch door, and the clamping force of the anti-pinch door is cut off in time when clamping foreign objects, thus avoiding rigid clamping injuries.

[0028] Preferably, auxiliary blocks are symmetrically fixedly connected to the upper and lower ends of the first groove. The auxiliary blocks are placed between the connecting plate and one side of the first groove to limit the movement range of the connecting plate.

[0029] The beneficial effect of adopting the above-mentioned further solution is that it limits the maximum backward movement of the anti-pinch door. In this way, even if the primary and secondary springs fail to function properly after long-term use and cannot accurately detect the pressure, when the connecting plate moves back to the auxiliary stop and contacts the auxiliary stop, the mechanical contact built into the auxiliary stop is triggered. The contact signal is transmitted to the control system, and the control system immediately starts the lifting mechanism, causing its output end to drive the anti-pinch door to retract, which can also remove foreign objects and avoid rigid compression.

[0030] Preferably, both of the anti-pinch doors are equipped with foreign object sensing strips on their adjacent sides, wherein:

[0031] The foreign object sensing strip includes a conductive layer, which is made of conductive rubber strip and fixedly connected to one side of the anti-pinch door. The conductive layer has an L-shaped structure.

[0032] Magnetic blocks are fixedly connected to both ends of the bonding surface of the conductive layer, and two magnetic blocks with corresponding heights between the two conductive layers are magnetically attracted to each other.

[0033] The beneficial effect of adopting the above-mentioned further solution is that the vertical and horizontal sections of the L-shaped conductive layer are in contact with each other simultaneously, increasing the contact area by 3-5 times compared with the straight strip type, reducing the risk of foreign objects being missed through gaps, and providing timely feedback information.

[0034] Preferably, the conductive layer contains a sensing layer and a signal layer.

[0035] The sensing layer employs miniature mechanical tentacles, and the signal layer employs a flexible thin-film pressure sensor.

[0036] When not in contact with foreign objects, the sensing layer remains upright and its ends do not come into contact with the surface of the signal layer;

[0037] When the sensor layer is compressed by contact with a foreign object, it deforms and bends to contact the surface of the signal layer, forming a closed circuit.

[0038] The beneficial effect of adopting the above-mentioned further solution is that an initial electrical signal is generated and transmitted to the control unit of the anti-pinch door through the internal conductive path, thereby the control unit issues an early warning and realizes early intervention. For flexible and thin foreign objects, the spring may not be compressed, but the bending of the mechanical touch sensing layer can trigger the early warning and avoid missed detection.

[0039] Preferably, a drive mechanism is provided at the top of the main door body. The drive mechanism includes a rack fixedly connected to one side of the top of the main door body. Gears are symmetrically rotatably connected inside the top plate of the fixed frame near the entrance and exit. The top of the gear passes through the inside of the top plate of the fixed frame and is fixedly connected to the output end of the servo motor. The bottom end of the servo motor housing is fixedly connected to the top of the fixed frame.

[0040] A guide rail is provided on one side of the lower end of the interior of the fixed frame;

[0041] Several rollers are evenly distributed laterally inside the lower end of the main gate body, and the outer surface of the rollers makes rolling contact with the upper surface of the guide rail.

[0042] The beneficial effect of adopting the above-mentioned further solution is that this method provides precise and stable transmission, strong controllability, and ensures the stable operation of the main gate.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0044] The anti-pinch doors extending from the main door form a safety barrier in advance, preventing passengers from being pinched when the main door closes rigidly. When a foreign object gets caught between the two anti-pinch doors, the first-level spring is compressed first, and the closing speed of the main door is slightly reduced based on the pressure data of the first-level spring. Subsequently, the second-level spring is compressed, and the moving speed of the main door is reduced again based on the pressure data of the second-level spring. On the one hand, this avoids deformation of the foreign object or damage to the door structure due to excessive pressure, and at the same time, it allows more time for the main door to close, making it easier for passengers or station staff to handle the stuck foreign object. On the other hand, it avoids the loss of operational efficiency caused by a "one-size-fits-all" deceleration. When the pressure threshold exceeds the clamping force threshold of the anti-pinch door, the lifting mechanism pulls the anti-pinch door backward without resistance without obstructing the movement of the main door, so that the clamping force disappears and avoids hard squeezing injury, further improving the safety of the device. Attached Figure Description

[0045] Figure 1 This is an isometric structural schematic diagram of one side of the present invention;

[0046] Figure 2 This is a top view cross-sectional structural diagram of the present invention;

[0047] Figure 3 This is a schematic diagram of the initial state structure of the shielding door of the present invention;

[0048] Figure 4 This is a schematic diagram of the initial foreign object clamping structure when the shielding door of the present invention is closed;

[0049] Figure 5 This is a schematic diagram of the structure for continuous foreign object clamping when the shielding door of the present invention is closed;

[0050] Figure 6 This is a schematic diagram of the shielding door closure structure without foreign object clamping according to the present invention;

[0051] Figure 7 This is a schematic diagram of the shielding door structure after it is closed according to the present invention;

[0052] Figure 8 For the present invention Figure 2 A schematic diagram of the structure at point A.

[0053] The meanings of the labels in the diagram are as follows:

[0054] 1. Fixed frame; 11. Guide rail;

[0055] 2. Main door body; 21. First groove; 22. Second groove; 23. Limiting cylinder;

[0056] 3. Drive mechanism; 31. Rack; 32. Gear; 33. Servo motor; 34. Roller;

[0057] 4. Anti-pinch door;

[0058] 5. Speed ​​control mechanism; 51. Connecting plate; 52. Extrusion rod; 53. Pressure acquisition bar; 54. Primary spring; 55. Secondary spring; 56. Lifting mechanism; 57. Auxiliary stop block;

[0059] 6. Foreign object sensing strip; 61. Conductive layer; 62. Sensing layer; 63. Signal layer; 64. Magnetic block. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] Please see Figures 1-8 As shown, this embodiment provides a passenger protection device for rail transit platform screen doors, including a fixed frame 1. The fixed frame 1 has main door bodies 2 symmetrically arranged on the left and right sides inside, and a guide rail 11 is arranged on one side of the lower end inside the fixed frame 1. The two main door bodies 2 move laterally relative to each other or in opposite directions under the limiting guidance of the guide rail 11, so that the door bodies can open and close, becoming a safety isolation barrier between the platform and the track.

[0062] Specifically: Considering that traditional contact-type anti-pinch mechanisms only trigger the door's reverse movement after the pressure reaches a threshold following the clamping of a foreign object, which is a passive response after clamping occurs, and given the rigid structure of the shielded door, it is possible to cause injury to personnel or objects during the clamping process, thus reducing the safety of the shielded door, therefore, if Figure 3 As shown, the main door body 2 is provided with a first groove 21 inside, and an anti-pinch door 4 is slidably disposed inside the first groove 21. In the initial state, the two anti-pinch doors 4 are exposed outside the first groove 21 at their near ends. When the two main door bodies 2 move towards each other or away from each other, they drive the anti-pinch doors 4 to move, so that the two anti-pinch doors 4 can close before the main door body 2, forming a safety barrier in advance and preventing the main door body 2 from directly contacting the passengers when it is rigidly closed.

[0063] The exposed dimensions of the two anti-pinch doors 4 range from 15cm to 25cm. On the one hand, an exposed length of more than 15cm allows passengers to clearly perceive the closing trend of the door in advance and know that the distance is not suitable for passing through. On the other hand, an exposed length of less than 25cm ensures that there is enough buffer space when the anti-pinch doors 4 retract, allowing the trapped passenger to quickly pull their limbs away and avoid injury.

[0064] In order to effectively achieve the relative or opposite movement of the two main gate bodies 2, therefore, as Figure 2 and Figure 3As shown, a drive mechanism 3 is provided at the top of the main door body 2. The drive mechanism 3 includes a rack 31 fixedly connected to one side of the top of the main door body 2. A gear 32 is symmetrically rotatably connected inside the top plate of the fixed frame 1 near the entrance and exit. The top of the gear 32 passes through the inside of the top plate of the fixed frame 1 and is fixedly connected to the output end of the servo motor 33. The bottom end of the housing of the servo motor 33 is fixedly connected to the top plate of the fixed frame 1. The output end of the servo motor 33 drives the gear 32 to rotate in both directions. Since the gear 32 and the rack 31 are meshed, when the gear 32 rotates, it drives the main door body 2 to move the anti-pinch door 4 in a horizontal linear motion, thereby achieving the opening and closing of the entrance and exit of the fixed frame 1. This method of transmission is precise and stable, and has strong controllability.

[0065] Furthermore, several rollers 34 are evenly distributed horizontally inside the lower end of the main door body 2. The outer surface of the rollers 34 rolls in contact with the upper surface of the guide rail 11. The cooperation between the rollers 34 and the guide rail 11 can reduce frictional resistance, reduce motor energy consumption, and extend service life.

[0066] Working principle of drive mechanism 3: After the door opening / closing command is triggered, the control system sends a forward / reverse signal to the servo motor 33. The output shaft of the servo motor 33 drives the gear 32 to rotate. The gear 32 meshes with the rack 31, converting the rotational motion into linear motion. Under the transmission of the rack 31 and the gear 32, the main door 2 moves laterally along the guide rail 11 of the fixed frame 1 (relative movement closes, opposite movement opens).

[0067] Furthermore, considering that current anti-pinch protection mechanisms control the main door based on pressure feedback when the door is closed or nearly closed, when a foreign object is trapped, most actions simply stop the door from closing, with very few involving a retraction function. Moreover, when encountering a slender object, such as a finger, although the command is issued, there is a time lag between the command being issued and actual execution. This results in the finger being continuously squeezed for a period before the door stops closing or retracts, undoubtedly causing further injury. Therefore, if... Figures 3 to 7 As shown, a second groove 22 is provided inside the side of the first groove 21 away from the anti-pinch door 4. A speed control mechanism 5 for transmitting pressure and thus adjusting the moving speed of the main door body 2 is provided inside both the first groove 21 and the second groove 22.

[0068] The speed control mechanism 5 includes a primary spring 54 and a secondary spring 55. The length of the primary spring 54 is greater than that of the secondary spring 55. One end of both the primary spring 54 and the secondary spring 55 is fixedly connected to one side of the pressure collection strip 53. The pressure collection strip 53 is fixedly connected to the side of the second groove 22 away from the first groove 21. Subsequently, the force of the primary spring 54 and the secondary spring 55 squeezing the pressure collection strip 53 is used to determine whether the anti-pinch door 4 has caught a foreign object.

[0069] In order to achieve accurate transmission of pressure on the anti-pinch door 4 by the primary spring 54 and the secondary spring 55, and thus ensure accurate acquisition of pressure data, a connecting plate 51 is provided inside the first groove 21. The size of the connecting plate 51 is adapted to the size of the first groove 21, so that the connecting plate 51 can slide stably inside the first groove 21. On the side of the connecting plate 51 near the second groove 22, several extrusion rods 52 of the same length are fixedly connected to the primary spring 54 and the secondary spring 55 at the corresponding positions laterally. Among them, the extrusion rods 52 corresponding to the primary spring 54 laterally are fixedly connected to one end of the primary spring 54, and the extrusion rods 52 corresponding to the secondary spring 55 do not contact the secondary spring 55.

[0070] The diameters of the primary spring 54 and the secondary spring 55 are adapted to the internal width of the second groove 22, further limiting the movement direction of the primary spring 54 and the secondary spring 55, and preventing the primary spring 54 and the secondary spring 55 from deforming and shifting under force, thereby affecting the accuracy of pressure data acquisition by the pressure acquisition strip 53.

[0071] A limiting cylinder 23 is fixedly connected to one side of the first groove 21 and the corresponding lateral position of the extrusion rod 52. The inner diameter of the limiting cylinder 23 is adapted to the outer diameter of the extrusion rod 52. The extrusion rod 52 slides inside the limiting cylinder 23, which precisely limits the movement direction of the extrusion rod 52, avoiding radial displacement that could cause spring deformation or stiffness failure. At the same time, it can ensure that the spring compression and pressure are linearly related, avoiding distortion of the detection data of the pressure acquisition strip 53 due to displacement.

[0072] Lifting mechanisms 56 are fixedly connected to both the upper and lower ends of the connecting plate 51 near the anti-pinch door 4. The output end of the lifting mechanism 56 is fixedly connected to the side of the anti-pinch door 4 near the connecting plate 51. The lifting mechanism 56 adopts an electric push rod, and the extension and retraction amount is adjusted by the PWM signal of the control system.

[0073] The above connection structure enables the anti-pinch door 4 and the main door 2 to be connected in an elastic buffer, so that the clamping force of the anti-pinch door 4 is controlled within the safe threshold (≤5N), which is lower than the rigid clamping force of the main door 2. Even if clamping occurs, pain and injury can be reduced. Moreover, the anti-pinch door 4 is in direct contact with foreign objects and can quickly trigger pressure feedback through its own retraction, which is more immediate than the response of the main door 2, which relies on external sensing (such as laser).

[0074] Considering that the spring may not compress significantly for thinner foreign objects (such as hair or thin paper), resulting in missed detection, foreign object sensing strips 6 are installed on the side of each of the two anti-pinch doors 4 that are close to each other. The foreign object sensing strips 6 can accurately sense whether a foreign object is being pinched, thus avoiding missed detection. In addition, the foreign object sensing strips 6 can issue an early warning before the anti-pinch door 4 retracts and squeezes the first-stage spring 54. Combined with pressure feedback, they form a dual sensing effect, further shortening the response time.

[0075] In order to effectively improve sensing accuracy, therefore, Figure 8 As shown, the foreign object sensing strip 6 includes a conductive layer 61, a sensing layer 62, and a signal layer 63. The conductive layer 61 is made of conductive rubber strip and is fixedly connected to one side of the anti-pinch door 4. The conductive layer 61 has an L-shaped structure. When the two anti-pinch doors 4 are closed, the L-shaped conductive layer 61 forms a surface-to-surface contact (the vertical section and the horizontal section contact simultaneously). The contact area is 3-5 times larger than that of the straight strip type, reducing the risk of foreign objects being missed through gaps.

[0076] The sensing layer 62 uses miniature mechanical tentacles, and the signal layer 63 uses a flexible thin-film pressure sensor;

[0077] When the foreign object sensing strip 6 is in the initial non-contact state, the micro mechanical tendrils made of titanium alloy remain upright and their ends do not contact the surface of the pressure sensor. At this time, the tendrils and the sensor do not form a conductive circuit, and the entire sensing system is in standby mode.

[0078] When a foreign object comes into contact with the conductive rubber strip, the rubber strip will undergo local deformation due to the pressure of the foreign object. The deformation force is transmitted to the micro mechanical tendons, causing the originally upright tendons to bend towards the sensor. The ends of the tendons contact the flexible film surface of the sensor. Since the tendons (titanium alloy), the sensor (built-in conductive electrode), and the outer rubber strip (conductive material) are all conductive, a closed circuit is formed at the moment of contact, generating an initial electrical signal. This signal is transmitted to the control unit of the anti-pinch door 4 through the internal conductive path, thereby triggering the control unit to issue a warning.

[0079] To enable early intervention, even if the spring does not compress a thin, flexible foreign object, the bending of the mechanical touch sensing layer 62 can trigger an early warning, preventing missed detection. Furthermore, the early warning signal can be linked with the door warning light to enhance passenger awareness.

[0080] Furthermore, magnetic blocks 64 are fixedly connected to both ends of the bonding surface of the conductive layer 61. The two magnetic blocks 64 with corresponding heights between the two conductive layers 61 are magnetically attracted. When the two magnetic blocks 64 are attracted, a signal for the anti-pinch door 4 to be fully closed is sent to the control system, triggering the subsequent action of the anti-pinch door 4 retracting into the first groove 21.

[0081] Phase 1:

[0082] When the two main door bodies 2 drive the anti-pinch door 4 to move relative to each other and close, such as Figure 3 As shown in the enlarged view at point a, at this time, the primary spring 54 and the secondary spring 55 remain in normal condition, and the pressure acquisition strip 53 is not under force.

[0083] If a foreign object gets caught between the two anti-pinch doors 4, the object will squeeze the anti-pinch door 4. At this time, the main door body 2 will continue to move, and the anti-pinch door 4 will retract relative to the main door body 2, moving backward toward the connecting plate 51. Since the connecting plate 51 and the anti-pinch door 4 are connected by a lifting mechanism 56, the anti-pinch door 4 will simultaneously drive the lifting mechanism 56, the connecting plate 51, and the squeezing rod 52 to move backward. Figure 4 The enlarged view at point a is shown in the image.

[0084] Specifically, when the squeezing rod 52 squeezes the first-stage spring 54, the reaction force of the first-stage spring 54 is transmitted to the pressure sensor of the pressure acquisition strip 53. The conductive particles inside the sensor change their contact density with the pressure, resulting in a change in resistance (the greater the pressure, the smaller the resistance). The change in resistance is converted into an electrical signal (such as a 0-5V voltage signal), which is transmitted to the control unit of the anti-pinch door 4 to complete the pressure data acquisition.

[0085] Then, the control unit presets the pressure threshold of the first-stage spring 54 (e.g., 15N, corresponding to a clamping force of 3N). When the pressure acquisition bar 53 detects that the pressure of the first-stage spring 54 has reached the threshold, it sends an electrical signal to the speed control system of the main door body 2. The speed control system sends a deceleration command to the servo motor 33. By reducing the output speed of the motor (e.g., from 1500rpm to 750rpm), the speed of the gear 32 is reduced, and finally the speed of the main door body 2 is reduced to 0.15-0.1m / s (slight deceleration).

[0086] The pressure acquisition strip 53 has a built-in AD converter, which transmits the pressure electrical signal to the speed control system of the main gate 2 via the CAN bus.

[0087] Phase Two:

[0088] If a passenger senses the clamping of the anti-pinch door 4 and quickly pulls away, the first-stage spring 54 rebounds and pushes the connecting plate 51, the squeezing rod 52, the anti-pinch door 4 and other structures to reset. The pressure of the first-stage spring 54 on the pressure collection bar 53 disappears, the control unit sends a reset signal, the servo motor 33 speed increases, and the main door 2 returns to its initial speed.

[0089] Because the reaction time is limited during this process, and considering that a relatively large foreign object cannot be quickly removed, the anti-pinch door 4 continues to be squeezed. At this time, the anti-pinch door 4 and the connecting plate 51 and other structures continue to retreat until they retreat more than a certain distance. Then, the squeezing rod 52 corresponding to the secondary spring 55 contacts the secondary spring 55. Figure 5As shown in the enlarged view at point a, the secondary spring 55 begins to compress at this time, and the clamping force rises to a maximum of 5N (safety threshold). When the reaction force received by the anti-pinch door 4 exceeds the pressure threshold of the secondary spring 55, the speed control system reduces the moving speed of the main door 2 to 0.1m / s-0.05m / s (deep deceleration). The working principle is the same as that of the primary spring 54 mentioned above, and will not be described in detail here.

[0090] On the one hand, deep deceleration can reduce the compressive kinetic energy of heavy foreign objects (such as luggage) on the main door 2, avoiding deformation of foreign objects or damage to the door structure. At the same time, it can reserve more time for the main door 2 to close (such as 2-3 seconds more than the initial speed), making it easier for passengers or station staff to handle stuck foreign objects. On the other hand, the low speed combined with the stiffness (10N / mm) of the secondary spring 55 can keep the clamping force stable within the 5N safety threshold, which can not only avoid injury, but also remind passengers through moderate resistance.

[0091] If the anti-pinch door 4 continues to move backward and the resistance of the foreign object exceeds 5N (such as a hard metal object stuck), the control system will activate the lifting mechanism 56. The output end of the lifting mechanism 56 will retract, allowing the anti-pinch door 4 to move backward without resistance, completely cutting off the clamping force and avoiding hard squeezing injury.

[0092] Furthermore, there are several primary springs 54 and secondary springs 55, arranged alternately from top to bottom. This alternating arrangement allows the pressure at different heights of the anti-pinch door 4 to be detected (such as a hand being pinched at the top or luggage being pinched at the bottom), avoiding blind spots caused by the absence of a single spring. Moreover, when a single spring fails, adjacent springs can still work normally, preventing the anti-pinch function from failing due to local spring failure and improving reliability.

[0093] This pressure signal directly triggers the motor to slow down, improving response time and avoiding pinching damage caused by electronic signal delay. Furthermore, the speed reduction is graded according to spring pressure (first-level spring 54 corresponds to slight deceleration, and second-level spring 55 corresponds to deep deceleration), avoiding operational efficiency losses caused by "one-size-fits-all" deceleration.

[0094] Furthermore, auxiliary stops 57 are symmetrically fixedly connected to the upper and lower ends of the first groove 21. The auxiliary stops 57 are placed between the connecting plate 51 and one side of the first groove 21, limiting the movement range of the connecting plate 51, thereby limiting the maximum backward movement of the anti-pinch door 4. In this way, even if the primary spring 54 and the secondary spring 55 lose their elasticity after long-term use and cannot accurately detect the pressure, when the connecting plate 51 moves back to the auxiliary stops 57 and contacts the auxiliary stops 57, the mechanical contacts built into the auxiliary stops 57 are triggered. The contact signal is transmitted to the control system, and the control system immediately starts the lifting mechanism 56, so that its output end drives the anti-pinch door 4 to retract, detach from the foreign object, and avoid rigid compression.

[0095] Phase Three:

[0096] When the foreign object sensing strips 6 of the two anti-pinch doors 4 are in contact and there are no foreign objects (such as...) Figure 6 As shown), the two anti-pinch doors 4 are closed. The magnetic block 64 of the foreign object sensing strip 6 is attracted, sending a "anti-pinch door 4 closed" signal to the control system. The control system starts the lifting mechanism 56, controlling its output end to retract at a uniform speed (the retraction speed is consistent with the closing speed of the main door 2, such as 0.2m / s). Under the drive of the lifting mechanism 56, the anti-pinch door 4 retracts towards the connecting plate 51. At this time, the connecting plate 51 does not move (no foreign object compression). The squeezing rod 52 maintains a gap with the pressure collection strip 53 and the first-stage spring 54. The main door 2 continues to close until it is completely closed. The two anti-pinch doors 4 retract synchronously into the first groove 21 while always closed, without contacting the first-stage spring 54 and the second-stage spring 55 throughout the process (e.g., Figure 7 (As shown), to avoid pressure feedback affecting the door speed.

[0097] It should be noted that for the first-stage spring 54: F1=F2=k1・x1 (k1 is the stiffness of the first-stage spring 54, 5N / mm; x1 is the compression of the first-stage spring 54). For example, when x1=3mm, F2=5×3=15N. Since the compressive force is directly transmitted through the compressive rod 52 (ignoring friction loss), F1≈15N (corresponding to a clamping force ≤3N).

[0098] Stage 55 of the second-level spring: F1=F2=k1・x1_max+k2・x2 (x1_max is the maximum compression of the first-level spring 54; k2 is the stiffness of the second-level spring 55, 10N / mm; x2 is the compression of the second-level spring 55) Example: When x1_max=5mm and x2=2mm, F2=5×5+10×2=45N, corresponding to the squeezing force F1≈5N (safety threshold) of the anti-pinch door 4.

[0099] When the two main gate bodies 2 move in opposite directions under the drive of the drive mechanism 3 to open the gate, the anti-pinch door 4 is always retracted inside the first groove 21. If the anti-pinch door 4 extends, the main gate body 2 needs to reserve extra space to avoid the anti-pinch door 4 when opening, which may shorten the actual opening width (e.g., the original opening width of 1.5m is reduced to 1.3m due to the extension of the anti-pinch door 4), reducing the throughput per unit time. After the anti-pinch door 4 retracts, the main gate body 2 can open at the designed maximum stroke and speed to ensure passage efficiency and adapt to high passenger flow scenarios. When closing, the lifting mechanism 56 is activated first to push the anti-pinch door 4 to extend to the initial exposed position, and then the main gate body 2 moves relative to each other, and so on.

[0100] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A passenger protection device for a rail transit platform screen door, comprising a fixed frame (1), wherein main door bodies (2) are symmetrically arranged on the left and right sides inside the fixed frame (1), characterized in that: The main door body (2) is provided with an anti-pinch door (4) inside, and one end of the anti-pinch door (4) extends out of the inner cavity of the main door body (2); The main gate (2) is internally equipped with a speed control mechanism (5) for transmitting pressure to adjust the moving speed of the main gate (2), wherein: The speed control mechanism (5) includes a lifting mechanism (56), a connecting plate (51), a squeezing rod (52), a first-stage spring (54), and a pressure collection bar (53) connected in sequence to the other end of the anti-pinch door (4), wherein: the pressure collection bar (53) is fixed to the end of the inner cavity of the main door body (2) for collecting resistance; The first-stage spring (54) is fixedly connected at both ends between the extrusion rod (52) and the pressure acquisition strip (53) to form the initial resistance sensing; the outer surface of the pressure acquisition strip (53) is also provided with a second-stage spring (55), and the first-stage spring (54) and the second-stage spring (55) form a second-stage resistance sensing, and the resistance of the second-stage resistance sensing is greater than that of the initial resistance sensing; The closing speed of the main door (2) is slightly reduced based on the pressure data of the first-level spring (54). After squeezing the second-level spring (55), the moving speed of the main door (2) is reduced again based on the pressure data of the second-level spring (55). Both of the anti-pinch doors (4) are equipped with foreign object sensing strips (6) on their adjacent sides, wherein: The foreign object sensing strip (6) includes a conductive layer (61), which is made of conductive rubber strip and fixedly connected to one side of the anti-pinch door (4). The conductive layer (61) has an L-shaped structure. Magnetic blocks (64) are fixedly connected to both ends of the bonding surface of the conductive layer (61), and the two magnetic blocks (64) with corresponding heights between the two conductive layers (61) are magnetically attracted.

2. The passenger protection device for rail transit platform screen doors according to claim 1, characterized in that: The number of the compression rods (52) is equal to the sum of the number of the primary springs (54) and the secondary springs (55); A portion of the compression rod (52) is fixedly connected to a primary spring (54); During secondary buffer protection, another part of the compression rod (52) abuts against the secondary spring (55).

3. The passenger protection device for rail transit platform screen doors according to claim 1, characterized in that: Several primary springs (54) and secondary springs (55) are provided and are fixedly connected to one side of the pressure acquisition strip (53) in an alternating arrangement from top to bottom.

4. The passenger protection device for rail transit platform screen doors according to claim 1, characterized in that: The inner cavity of the main door body (2) is provided with a first groove (21) and a second groove (22); The anti-pinch door (4) and the connecting plate (51) are adapted to slide inside the first groove (21); The pressure acquisition strip (53) is fixedly connected to the side of the second groove (22) away from the first groove (21); The diameters of the primary spring (54) and the secondary spring (55) are adapted to the internal width of the second groove (22).

5. The passenger protection device for rail transit platform screen doors according to claim 4, characterized in that: Multiple limiting cylinders (23) are provided between the first groove (21) and the second groove (22). Multiple extrusion rods (52) are interlocked with multiple limiting cylinders (23), and the inner diameter of the limiting cylinder (23) is adapted to the outer diameter of the extrusion rod (52).

6. The passenger protection device for rail transit platform screen doors according to claim 1, characterized in that: The outer shell of the lifting mechanism (56) is fixed to the outer surface of the connecting plate (51), the piston rod of the lifting mechanism (56) is fixed to the end of the anti-pinch door (4), and the lifting mechanism (56) is used to partially drive the anti-pinch door (4) to slide into the inner cavity of the main door body (2).

7. The passenger protection device for rail transit platform screen doors according to claim 4, characterized in that: The first groove (21) has auxiliary blocks (57) fixedly connected symmetrically at its upper and lower ends. The auxiliary blocks (57) are placed between the connecting plate (51) and one side of the first groove (21) to limit the movement range of the connecting plate (51).

8. The passenger protection device for rail transit platform screen doors according to claim 1, characterized in that: The conductive layer (61) is provided with a sensing layer (62) and a signal layer (63) respectively. The sensing layer (62) adopts a micro mechanical tendril, and the signal layer (63) adopts a flexible thin film pressure sensor; When not in contact with foreign objects, the sensing layer (62) remains upright and its end does not come into contact with the surface of the signal layer (63); When in contact with a foreign object and under pressure, the sensing layer (62) deforms and bends to contact the surface of the signal layer (63) to form a closed circuit.

9. The passenger protection device for rail transit platform screen doors according to claim 1, characterized in that: The main door (2) is provided with a drive mechanism (3) at the top. The drive mechanism (3) includes a rack (31) fixedly connected to one side of the top of the main door (2). The fixed frame (1) has a gear (32) symmetrically connected to the top plate near the entrance and exit. The top of the gear (32) passes through the top plate of the fixed frame (1) and is fixedly connected to the output end of the servo motor (33). The bottom of the outer shell of the servo motor (33) is fixedly connected to the top plate of the fixed frame (1). A guide rail (11) is provided on one side of the lower end of the fixed frame (1). Several rollers (34) are evenly distributed in the transverse direction at the lower end of the main door body (2), and the outer surface of the rollers (34) rolls in contact with the upper surface of the guide rail (11).

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