Stop pin follow-up restraint device, door system and vehicle

Abstract

The present invention discloses a stop pin follower restraint device, a door system and a vehicle. The stop pin follower restraint device is arranged in the door sill and is used to increase the reliable restraint of the stop pin on the door leaf. When locking, the lock fork and the ratchet rotate under the action of the stop pin. When the lock fork follows to the closed position, the over-dead point torsion spring pulls the ratchet and the lock fork to reverse, and the contact between the stop pin and the lock fork changes from the first side wall to the second side wall; the electromagnet is energized and attracted, the pull rod retracts, the roller contacts the locking arm and drives the pawl to rotate toward the ratchet side, and the finger-shaped object presses against the ratchet to reach the sealed locking position. When unlocking, the electromagnet is de-energized, and the pawl rotates counterclockwise under the action of positive stress, friction and limiting torsion spring. The pawl disengages from the ratchet teeth of the ratchet, and the lock fork rotates under the push of the stop pin and returns to its initial position. The present invention solves the problems of narrow space under the door sill, uncertain movement trajectory of the stop pin, and unlocking power failure, while improving the sound insulation performance without reducing the operational reliability of the door system itself.

Description

Technical Field

[0001] The present invention relates to a rail transit vehicle and a plug-type sliding door system, and in particular to a stopper pin follower restraint device, a door system and a vehicle. Background Art

[0002] Double-opening sliding doors account for a large proportion of passenger compartment doors in urban rail vehicles. After the doors are closed, the door edges on all four sides are in contact with the vehicle body. Sealing strips are installed on the doors at the contact points. The restraint performance of the doors directly affects their sound insulation performance.

[0003] In order to improve the sound insulation performance of the door system, Chinese patents CN112901002A and CN201687303U are equipped with multi-point restraint devices at the upper part, middle part and lower part of the side of the door system. The multi-point restraint devices enable the door system to achieve good sealing and sound insulation effects under static working conditions. However, under negative pressure conditions when passing through a tunnel, howling can often be heard.

[0004] The applicant discovered that when the vehicle is in dynamic operation, the sound leakage is most significant at the lower stop pin due to the lack of a reliable restraining mechanism, which results in a reduction in the overall dynamic sound insulation level of the door system and a significant reduction in passenger comfort. However, the stop pin is located at the lower part of the front stop of the door leaf, which is far away from the upper load-bearing, drive and main locking device of the mechanism. It is affected by many factors such as the environment, door leaf stiffness, and door leaf shape and position accuracy. The end point of its movement is uncertain each time the door is closed. If conventional active locking and power unlocking devices are used, it is easy to cause a failure in opening and closing the door normally, thereby affecting the operational reliability of the door system. In addition, the space under the threshold is small, and auxiliary locks, main locks and other structures cannot be used, resulting in no effective solution to this problem in the double-door system. Summary of the Invention

[0005] Purpose of the invention: The present invention aims to provide a stop pin follower restraint device that can improve the restraint performance and sound insulation performance of the door system; the present invention also provides a double-opening plug sliding door system and vehicle containing the above-mentioned stop pin follower restraint device.

[0006] Technical solution: The stop pin follower constraint device described in the present invention is arranged in the door sill, and is used to increase the follow-up and step-by-step constraint of the stop pin on the door leaf; the stop pin follower constraint device includes a constraint execution device and a power component; the constraint execution device includes a lock fork, a ratchet, a pawl and an over-dead point element; wherein, the lock fork and the ratchet are synchronously rotated and connected, the ratchet and the pawl cooperate, one end of the over-dead point element is connected to the ratchet, and the other end is fixed to the housing of the constraint execution device; when the door leaf is closed, the lock fork and the ratchet rotate under the action of the stop pin, and when the lock fork follows to the closed position, the over-dead point element pulls the ratchet and the lock fork to reverse, and the contact between the stop pin and the lock fork changes from the first side wall to the second side wall, eliminating the gap between the stop pin and the lock fork groove; then the power component drives the pawl to rotate toward the ratchet side, and the pawl drives the ratchet to rotate in the same direction, and the lock fork reaches the sealed closed and locked position.

[0007] Furthermore, the ratchet and pawl form an eccentric structure. When the seal is locked, the positive stress between the ratchet and the pawl points to the locking arm side of the pawl. The shortest distance of the positive stress relative to the center of the pawl is the eccentric distance e. The angle α between the ratchet and pawl contact point and the connecting line of the pawl center and the positive stress satisfies:

[0008] tanα>μ≥tanα-F max / (a*N max )

[0009] Eccentricity e:

[0010] e=a*sinα

[0011] Where μ is the friction coefficient between the ratchet and the pawl, F max is the maximum output tension of the power assembly, a is the shortest distance between the ratchet pawl contact point and the pawl center, N max It is the normal stress between the ratchet and the pawl under the negative pressure condition of driving.

[0012] Furthermore, the ratchet and pawl are made of 40Cr or 45 steel, with a surface hardness of not less than 550HV0.1, the ratchet surface is polished, and the friction coefficient μ of the ratchet and pawl is 0.16-0.22.

[0013] Furthermore, the ratchet is an incomplete indexing ratchet with a tip radius of 40-44mm and a central angle of 4-6° for each ratchet tooth. This incomplete indexing ratchet can be placed in the narrow space below the threshold, offering high adaptability while maintaining the same threshold length as the original, without affecting the length of the anti-slip area.

[0014] Furthermore, the ratchet and pawl form an eccentric structure with an eccentric distance of not less than 5 mm. In the event of a power outage, the ratchet can be unlocked automatically without relying on other power sources or an unlocking torsion spring with a large unlocking torque.

[0015] Furthermore, the over-dead point element is an over-dead point torsion spring, and its installation torque and working torque range are 50 to 150 N.mm. It is used to position the lock fork in the free state and eliminate the gap between the stop pin and the pawl before locking to ensure that the pawl further pushes the ratchet when locking, thereby driving the stop pin to move in the direction of closing the door, thereby improving the sealing effect.

[0016] Furthermore, the over-dead point element includes two compression springs or two tension springs.

[0017] Furthermore, the power assembly is pressed against the vehicle body by the restraint actuator through a height adjustment mechanism. The power assembly includes a pull rod, an electromagnet, a roller, and a guide slot. The pull rod is connected to the electromagnet and roller at both ends. The electromagnet automatically resets in the event of a power failure. Both the power assembly and the restraint actuator are modularly designed for easy disassembly and maintenance.

[0018] The door system of the present invention includes a door sill, a left stop pin, a right stop pin, a left door leaf, a right door leaf, a balance wheel assembly, a lower swing arm assembly, a load-bearing drive mechanism and the above-mentioned stop pin follower restraint device.

[0019] The control method of the door system described in the present invention determines whether there is a lock-in-place signal before the pawl is actuated. If there is no lock-in-place signal, the electromagnet loses power and the process is terminated; if there is a lock-in-place signal, it is determined in turn whether the door is isolated and whether there is a zero-speed signal.

[0020] The vehicle of the present invention includes a vehicle body, and is characterized in that the vehicle body is equipped with a door system, which is the above-mentioned door system.

[0021] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. The stop pin follow-up restraint device realizes follow-up and polar restraint of the stop pin in different motion states through the over-dead point torsion spring and the graded ratchet pawl of the eccentric structure, limits the outward displacement of the lower part of the door leaf under negative pressure conditions during driving, passenger squeezing and other working conditions, and improves the dynamic sound insulation performance of the door system; 2. The stop pin follow-up restraint device is a follow-up locking device, which has strong adaptability to the movement of the lower stop pin away from the main driving source; 3. The stop pin follow-up restraint device is set by the ratchet pawl of the eccentric structure and its friction coefficient , it can realize the self-unlocking function when the power is off, without relying on any other additional power or unlocking torsion spring with large unlocking torque, and will not affect the operational reliability of the door system; 3. The stop pin follower restraint device uses an incomplete tooth indexing ratchet design, which can be arranged in the narrow space under the threshold. It has high spatial adaptability, and the occupied threshold length is the same as the original, without affecting the length of the anti-slip area; 4. The modular design of the constraint execution device and power assembly allows the electromagnet to be replaced and repaired without removing the threshold, and the mechanical and electrical parts are highly maintainable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the stop pin follower restraint device;

[0023] Figure 2 It is a front view of the stop pin follower restraint device;

[0024] Figure 3 Schematic diagram of the initial state of the stop pin follower restraint device;

[0025] Figure 4 It is a partial schematic diagram of the stop pin follower restraint device;

[0026] Figure 5 Schematic diagram of the ratchet installation

[0027] Figure 6 Figure 3 is a partial schematic diagram of the stopper follower restraint device in the unlocked state; where e is the eccentricity of the shortest distance between the normal stress and the pawl center, α is the angle between the normal stress and the line connecting the ratchet pawl contact point and the pawl center, and a is the shortest distance between the ratchet pawl contact point and the pawl center.

[0028] Figure 7 is the motion trajectory of the stop pin; where j is the motion trajectory of the center of the stop pin, k is the stop pin position corresponding to the worst sealing state, l is the stop pin position corresponding to the theoretical sealing state, and m is the stop pin position corresponding to the limit sealing state;

[0029] Figure 8 This is a comparison of the states of the stop pin and the lock fork before and after the torsion spring pulls the ratchet wheel to reverse one ratchet tooth; this is the stop pin position corresponding to the worst sealing state;

[0030] Figure 9 Schematic diagram of the structure of the ratchet;

[0031] Figure 10 This is an exploded diagram of the door system;

[0032] Figure 11 This is the logic control diagram of the stop pin follower constraint device. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] The stop pin follower restraint device of the present invention, which is provided in the threshold 2 and constrains the door leaf stop pin, comprises a restraint actuator 3 and a power assembly 4. The restraint actuator 3 is fixedly connected to the threshold 2, and the power assembly 4 is limited in the X and Y directions relative to the restraint actuator 3 by a left positioning element 403 and a right positioning element 404. The restraint actuator 3 presses the power assembly 4 against the vehicle body 7 via a left height adjustment device 303 and a right height adjustment device 304, thereby supporting and limiting the stop pin restraint device 1.

[0035] The constraint execution device 3 includes a cover plate 301, a box body 302, a left height adjustment device 303, a right height adjustment device 304, and left and right constraint units, wherein the left height adjustment device 303, the right height adjustment device 304, and the left and right constraint units are symmetrically arranged about the center of the box body 302. When the door leaf is closed or unlocked, the left lock fork 305 in the left constraint unit cooperates with the left stop pin 5, and the right lock fork 306 in the right constraint unit cooperates with the right stop pin 6. Since the left and right constraint units are arranged in a mirror image, taking the left constraint unit as an example, the left constraint unit includes a left lock fork 305 installed at the bottom of the inner cavity of the box body 302, a ratchet 307 installed at the bottom of the box body 302, and a pawl 310. The left locking fork 305 and ratchet 307 are connected for synchronous rotation via a ratchet shaft 308. The ratchet 307 comprises a ratchet body and a rotating arm extending from the side of the ratchet body. The end of the rotating arm is provided with a plurality of ratchet teeth 315. The ratchet tooth tip radius is 40-44 mm, and the corresponding central angle of a single ratchet tooth is 5°. The ratchet 307 is a graduated ratchet with incomplete teeth. A connecting portion extends from the ratchet body on the opposite side of the rotating arm. This connecting portion is connected to an over-dead-point torsion spring 313, the other end of which is fixed to the bottom of the box body 302. The pawl 310 is fixed to the bottom of the box body 302 via a pawl shaft 308 and a limiting torsion spring 309. The pawl 310 comprises a pawl body, a locking arm extending from the side of the pawl body, and a finger-like member extending from the side of the locking arm near the ratchet. The ratchet 307 and the pawl 310 are made of 40Cr or 45 steel, with a surface hardness of not less than 550HV0.1. The ratchet surface is polished, and the friction coefficient μ of the ratchet and the pawl is 0.16 to 0.22.

[0036] The power assembly 4 includes a left power unit and a right power unit. The left power unit includes a left electromagnet 401, a left positioning element 403, a base plate 405, a pull rod 406, a guide slot 407, a roller 408, and a stop pin 409. The right power unit includes a right electromagnet 402, a right positioning element 404, a base plate 405, a pull rod 406, a guide slot 407, a roller 408, and a stop pin 409. Since the left and right power units are arranged in a mirror image, taking the left power unit as an example, the two ends of the pull rod 406 are respectively connected to the left electromagnet 401 and the roller 408, and a guide groove 407 and a limit pin 409 are installed on the bottom plate 405 on the side of the locking arm away from the ratchet. The roller 408 rolls in the guide groove 407, and the roller 408 is slightly higher than the locking arm. The left electromagnet 401 is energized and attracted, the pull rod 406 retracts, and the roller 408 contacts the locking arm to drive the pawl to rotate toward the ratchet side (clockwise rotation). The finger-shaped object presses against the ratchet 315, and the left locking fork 305 reaches the final sealed locking position.

[0037] Taking the left door leaf as an example, the door leaf plug pull angle D15 is 35°. When the door leaf is closed, the fixed left stop pin 5 on the door leaf pushes the left locking fork 305 and the ratchet 307 to rotate to the closed position. Under the action of the over-dead point torsion spring 313, the ratchet 307 and the left locking fork 305 reverse, so that the left locking fork 305 changes from contacting the left stop pin 5 with the first side wall 311 to contacting the left stop pin 5 with the second side wall 312, eliminating the gap between the stop pin and the lock fork groove. Then, the left electromagnet 401 is energized and attracted, and the roller 408 is pulled back through the pull rod 406. The roller 408 drives the pawl 310 to rotate clockwise. During the movement of the pawl 310, it will drive the ratchet 307 to rotate clockwise by no more than 1 tooth, thereby driving the left stop pin 5 and the left door leaf 8 to move further into the vehicle. The static sealing performance of the lower part of the door system is improved, and the static sound insulation performance is improved. At this time, the torque generated by the output of the electromagnet 401 is used to overcome the positive stress torque to achieve locking.

[0038] When locked, the maximum output tension Fmax of the electromagnet 401, the friction coefficient μ between the ratchet 307 and the pawl 310, the normal stress N between the ratchet and the pawl, the friction force f between the ratchet and the pawl, the angle α between the normal stress and the connecting line between the ratchet and the pawl contact point and the pawl center, to avoid self-locking α>arctanμ, the eccentric distance e at the contact point between the ratchet 307 and the pawl 310, as shown in FIG. Figure 6 When locked, the normal stress N between the ratchet and the pawl is very small, which can ensure that the pulling force required by the electromagnet is less than Fmax, so it can be locked in the normal state.

[0039] During the action of the pawl 310, the second side wall 312 of the left locking fork 305 may lose contact with the left stop pin 5, resulting in a gap. However, since the angle difference D13 of the ratchet teeth 315 of the ratchet wheel 307 is 5°, the pawl 310 moves quickly under the action of the left electromagnet 401, and the ratchet shaft 308 drives the left locking fork 305 and the ratchet wheel 307 to rotate counterclockwise by a ratchet angle of 5° at most. Therefore, according to Figure 7 As shown in the motion trajectory of the left stop pin 5 , the Y-direction gap D14 between the left stop pin 5 and the locking fork 305 does not exceed 1 mm.

[0040] The ratchet and pawl form an eccentric structure. When the seal is locked, the positive stress between the ratchet and the pawl is directed to the side of the pawl body close to the locking arm. The shortest distance of the positive stress relative to the pawl center 314 is the eccentric distance e. The angle α between the ratchet and pawl contact point and the connecting line of the pawl center and the positive stress satisfies:

[0041] tanα>μ≥tanα-F max / (a*N max )

[0042] Eccentricity e:

[0043] e=a*sinα

[0044] Where μ is the friction coefficient between the ratchet and the pawl, F max is the maximum output tension of the electromagnet, a is the shortest distance between the ratchet pawl contact point and the pawl center, N max It is the normal stress between the ratchet and the pawl under the negative pressure condition of driving.

[0045] Unlocking: The electromagnet 401 is powered off, and the normal stress N at the pawl 310 has an eccentric distance e relative to the center of the pawl 310. Under the combined effect of the eccentric torque N*e of the normal stress N, the friction torque f*a generated by the friction force f between the ratchet 307 and the pawl 310, the working torque T1 of the limit torsion spring 309, and the rolling friction torque T2 between the pawl 310 and the constraint execution device 3, the unlocking torque T 解 satisfy:

[0046] T 解 =N*ef*a+T1-T2≈a*(tanα-μ)*N>0,

[0047] Even if the limiting torsion spring 309 fails or breaks, it can still be unlocked automatically, ensuring the operational reliability of the door system.

[0048] The pawl 310 rotates counterclockwise, the pawl 310 is disengaged from the ratchet teeth 315 of the ratchet wheel 307, and the left lock fork 305 rotates under the push of the left stop pin 5 of the left door leaf 8 and returns to its initial position. The right side is unlocked in the same way and will not be described in detail.

[0049] Negative pressure conditions during driving: According to the locking process, the Y-direction gap between the side wall 315 of the left locking fork 305 and the left stop pin 5 does not exceed 1 mm. Therefore, under negative pressure conditions, the door leaf is pushed outward, and the Y-direction movement of the left stop pin 5 does not exceed 1 mm, which is smaller than the 4-6 mm overlap of the rubber strip required for the conventional Sierra door system. The lower rubber strip in the door system can still ensure reliable overlap, and the decline in sealing performance is very limited. The sound leakage here is reduced less, and the sound insulation performance of the door system is effectively improved.

[0050] The actual output of electromagnet 401 under negative pressure is F = a*(tanα-μ)*N. Because negative pressure conditions exist (the worst case for urban rail is 1.2 kPa + 1000 N / m passenger pressure), N significantly increases to Nmax. If F exceeds Fmax, the locking mechanism will fail. Therefore, μ can be calculated as ≥tanα-Fmax / (a*Nmax).

[0051] To ensure that all functions are normal, it is necessary to ensure that tanα>μ≥tanα-Fmax / (a*Nmax), that is, the friction coefficient at the pawl 310 and the ratchet wheel 307 must be controlled between 0.16 and 0.22.

[0052] The door system described in the present invention includes a door sill 2, a left stop pin 5, a right stop pin 6, a left door leaf 8, a right door leaf 9, a balance wheel assembly 10, a lower swing arm assembly 11, a load-bearing drive mechanism 12 and the above-mentioned stop pin follower restraint device 1, a constraint execution device 3 and a power assembly 4, a total of 2 groups.

[0053] The control method of the door system of the present invention is as follows:

[0054] (1) When the following conditions are met, the electromagnet is energized, the pawl moves, and the restraint is achieved:

[0055] (1.1) The door is locked and isolated, and the electromagnet is energized;

[0056] (1.2) When the hard-wired "zero-speed train line" signal changes from high level to low level, the locked door electromagnet is energized. (2) When the following conditions are met, the electromagnet loses power, the positive pressure torque acts, and the device 1 realizes self-unlocking:

[0057] (2.1) The hard-wired “zero-speed train line” signal changes from low level to high level, and the electromagnet loses power;

[0058] (2.2) If the door is not locked, the electromagnet loses power.

[0059] The vehicle of the present invention comprises a vehicle body, and the vehicle body is equipped with the above-mentioned door system.

Claims

1. A stop pin follower restraint device, characterized in that: The stop pin follow-up restraint device (1) is arranged in the door sill (2) and is used to increase the follow-up and step-by-step restraint of the stop pin on the door leaf; the stop pin follow-up restraint device (1) includes a restraint execution device (3) and a power assembly (4); the restraint execution device (3) includes a lock fork, a ratchet, a pawl and an over-dead point element; wherein the lock fork and the ratchet are synchronously rotated and connected, the ratchet and the pawl cooperate, one end of the over-dead point element is connected to the ratchet, and the other end is fixed to the housing of the restraint execution device (3); when the door leaf is closed, the lock fork and the ratchet rotate under the action of the stop pin, and when the lock fork follows to the closed position, the over-dead point element pulls the ratchet and the lock fork to reverse, and the contact between the stop pin and the lock fork changes from the first side wall (311) to the second side wall (312), eliminating the gap between the stop pin and the lock fork groove; then the power assembly (4) drives the pawl to rotate toward the ratchet side, and the pawl drives the ratchet to rotate in the same direction, and the lock fork reaches the sealed closed locked position.

2. The stop pin follower restraint device according to claim 1, characterized in that: The ratchet and the pawl form an eccentric structure. When the seal is locked, the positive stress between the ratchet and the pawl points to the locking arm side of the pawl. The shortest distance of the positive stress relative to the pawl center (314) is the eccentric distance e. The angle α between the ratchet and pawl contact point and the pawl center connection line and the positive stress satisfies: tanα>μ≥tanα-F max / (a*N max ) Eccentricity e: ； Where μ is the friction coefficient between the ratchet and the pawl, F max is the maximum output tension of the power assembly, a is the shortest distance between the ratchet pawl contact point and the pawl center, N max It is the normal stress between the ratchet and the pawl under the negative pressure condition of driving.

3. The stop pin follower restraint device according to claim 2, characterized in that: The ratchet and pawl are made of 40Cr or 45 steel, with a surface hardness of not less than 550HV0.1, the ratchet surface is polished, and the friction coefficient μ of the ratchet and pawl is 0.16~0.

22.

4. The stop pin follower restraint device according to claim 1, characterized in that: The ratchet is an incomplete tooth indexing ratchet, the tooth top radius of the ratchet teeth is 40-44 mm, and the corresponding central angle of a single ratchet tooth is 4-6 degrees.

5. The stop pin follower restraint device according to claim 1, characterized in that: The ratchet and the pawl form an eccentric structure, and the eccentric distance is not less than or equal to 5 mm.

6. The stop pin follower restraint device according to claim 1, characterized in that: The over-dead point element is an over-dead point torsion spring (313), the installation torque and working torque of which range from 50 to 150 N.mm, and is used to position the lock fork in the free state and to provide power to the ratchet during the locking process to eliminate the gap between the stop pin and the lock fork groove.

7. The stop pin follower restraint device according to claim 1, characterized in that: The over-dead point element includes two compression springs or two tension springs.

8. The stop pin follower restraint device according to claim 1, characterized in that: The power assembly (4) is pressed onto the vehicle body (7) by the constraint execution device (3) through the height adjustment device. The power assembly (4) includes a pull rod (406), an electromagnet, a roller (408) and a guide slot (407). The two ends of the pull rod (406) are respectively connected to the electromagnet and the roller (408).

9. A door system comprising a door sill (2), a left stop pin (5), a right stop pin (6), a left door leaf (8), a right door leaf (9), a balancing wheel assembly (10), a lower swing arm assembly (11) and a bearing drive mechanism (12), characterized in that: It also includes the stop pin follower restraint device (1) as described in claims 1 to 8.

10. A method for controlling a door system according to claim 9, characterized in that: Before the ratchet moves, it is determined whether there is a lock-in position signal. If there is no lock-in position signal, the electromagnet power-off process ends; if there is a lock-in position signal, it is determined in turn whether the door is isolated and whether there is a zero-speed signal.

11. A vehicle comprising a vehicle body, characterized in that: The vehicle body is equipped with a door system, which is the door system according to claim 9.

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