A screw end unlocking device and a door of a city rail vehicle

Abstract

The application relates to a screw rod end unlocking device and belongs to the technical field of vehicle door unlocking devices. The device comprises a pull wire disc, a first rotating disc, a second rotating disc, a rotating shaft sleeve and a mounting seat. The rotating shaft sleeve is coaxially connected with a gear piece. A plurality of guide columns are arranged on the second rotating disc in a sliding mode. The guide columns are connected with engaging blocks. A plurality of guide grooves are arranged on the first rotating disc. The guide columns and the guide grooves are in one-to-one correspondence. The two side walls of the guide grooves are respectively a first side wall and a second side wall. A limiting groove is arranged on the second rotating disc. A limiting piece is arranged in the mounting seat. The limiting groove has two opposite side walls. When the first torsional spring is in a natural state, the side wall of the limiting groove in contact with the limiting piece is a third side wall, and the guide column is in abutment with the first side wall at the moment. When the door is manually unlocked, unlocking is realized through gear engagement transmission, and after the unlocking is completed, automatic resetting is realized to separate the engaging state, so that the screw rod can be reversely rotated. The application has the effects of improving the reliability of the unlocking device resetting and the overall service life.

Description

Technical Field

[0001] This application relates to the technical field of vehicle door unlocking devices, and in particular to a screw end unlocking device and a door for urban rail vehicles. Background Technology

[0002] Automatic doors on urban rail vehicles typically use a screw-driven mechanism for opening and closing. Specifically, a drive motor rotates the screw, causing two transmission mechanisms connected to the automatic door to move in a predetermined direction, thus achieving the opening and closing action of the automatic door. To improve the stability and operational safety of the automatic door after it has closed completely, screw-driven automatic door systems are usually also equipped with an automatic locking mechanism, enabling the automatic door to automatically enter the locked state after closing.

[0003] When an automatic door is opened normally, the motor usually drives the lead screw to rotate in the opposite direction first, causing the automatic locking mechanism to disengage from the locked state and unlock. Only then can the automatic door be driven to open again. Because the lead screw drive has good self-locking characteristics, the lead screw will usually not rotate on its own due to external force when there is no power drive, thus effectively preventing the automatic door from being accidentally opened or closed due to external force, resulting in a high level of safety.

[0004] However, when the vehicle loses power or the drive system fails, the automatic door cannot unlock using the motor, and manual unlocking is usually required in an emergency. In existing technology, an intermediate unlocking device is commonly used for emergency unlocking. This type of intermediate unlocking device is typically an indirect unlocking device, which rotates a lead screw by a certain angle, switching the unlocking mechanism inside the door (such as a nut unlocking assembly) from the locked state to the unlocked state, after which the automatic door is manually pushed open.

[0005] For example, patent CN119616314A discloses a door screw unlocking device for urban rail vehicles, which can unlock the door's internal unlocking mechanism by manually pulling the rotating coil. However, this solution still has certain shortcomings. Specifically, there is no effective limiting structure between the wheel seat and the rotating wheel, which means that when the wheel seat drives the rotating wheel to reset under the action of the torsion spring, the rotating wheel may continue to rotate a short distance in the reset direction of the torsion spring due to inertia. As a result, the sliding block may still be partially or even fully extended after resetting.

[0006] During subsequent manual pushing of the automatic door, although the ratchet can push the sliding block to move again, the sliding block may not reliably return to the predetermined position, causing abnormal interference between the sliding block and the ratchet. After long-term use, the end faces of the sliding block and ratchet are prone to wear, which may even cause the ends of the sliding block or ratchet to crack or break in severe cases, thus affecting the normal use of the unlocking device and the reliability of subsequent unlocking, and reducing the overall service life. Summary of the Invention

[0007] To address the aforementioned issues, this application provides a lead screw end unlocking device and a door for urban rail vehicles.

[0008] The lead screw end unlocking device provided in this application adopts the following technical solution: A lead screw end unlocking device includes a pull cable reel, a first turntable, a second turntable, a rotating sleeve, and a mounting base. The rotating sleeve is rotatably disposed within the mounting base and is connected to the lead screw. A geared component is coaxially connected to the rotating sleeve. Both the first and second turntables are rotatably disposed within the mounting base. The pull cable reel is connected to the mounting base via a first torsion spring and is connected to the first turntable. A plurality of guide posts are slidably disposed on the second turntable, and each guide post moves radially along the second turntable. Each guide post is connected to a meshing block. A plurality of guide grooves are formed on the first turntable, and each guide post corresponds to one of the guide grooves. The two side walls of each guide groove are a first side wall and a second side wall, respectively. When a guide post contacts the first side wall, the meshing block separates from the tooth groove of the geared component. When a guide post contacts the second side wall, the meshing block inserts into the tooth groove of the geared component. The feature is that: a limiting groove is formed on the second turntable, a limiting component is provided in the mounting base, and the limiting groove has two opposing side walls; When the first torsion spring is in its natural state, the sidewall of the limiting groove that contacts the limiting member is the third sidewall. The third sidewall restricts the second turntable from rotating in the direction of the first torsion spring's reset rotation, and at this time, the guide post abuts against the first sidewall.

[0009] By adopting the above technical solution, when manual unlocking is required, the pull-coil can be rotated by turning the knob connected to the pull-coil winding on the vehicle, or by directly pulling the winding, causing the pull-coil to rotate. The pull-coil synchronously drives the first turntable to rotate. As the first turntable rotates, the guide groove pushes the guide post to move radially. When the guide post moves to abut against the second side wall of the guide groove, the meshing block inserts into the tooth groove of the geared component, thereby establishing a transmission connection between the first turntable and the pulley component. Subsequently, the first turntable continues to rotate and drives the second turntable to rotate synchronously through the guide post. The second turntable then drives the geared component, the rotating shaft sleeve, and the lead screw to rotate, thereby unlocking the door locking mechanism.

[0010] After unlocking, release the knob or wind the cord. The first torsion spring drives the pull-cord plate and the first turntable to rotate in the reset direction. During the reset process, the guide groove on the first turntable first drives the guide post to move radially back, causing the meshing block to disengage from the tooth groove of the geared component, thereby releasing the transmission connection between the first turntable and the geared component. Subsequently, the first turntable continues to drive the second turntable to rotate in the reset direction. When the first turntable resets to its initial position, the third sidewall on the second turntable just abuts against the limiting component, thereby limiting the second turntable and preventing it from continuing to rotate in the reset rotation direction of the first torsion spring under inertia.

[0011] This avoids the second turntable from rotating too much due to inertia, causing the engagement block to remain partially or even fully extended after reset. This prevents abnormal pressure, end-face wear, or even breakage or fracture of the engagement block or geared component when the door is manually pushed later, thereby improving the reliability of the unlocking device reset and its overall service life.

[0012] Optionally, the other side wall of the second limiting groove is a fourth side wall. When the second turntable rotates to the point where the screw drives the door lock to unlock, the fourth side wall abuts against the limiting member.

[0013] By adopting the above technical solution, after the first turntable drives the second turntable to rotate and the screw unlocks the door lock, the fourth side wall can abut against the limiting member, thereby restricting the continued rotation of the second turntable in the unlocking direction. Since the second turntable is restricted from further rotation, the guide post remains abutted against the second side wall of the guide groove, thus preventing the first turntable from continuing to rotate relative to the second turntable, thereby avoiding forced rotation of the first turntable after unlocking. This prevents further rotation after unlocking from causing the screw to continue moving in the direction of opening the door, avoiding excessive shearing or compressive forces on the guide post and engaging block, and reducing the risk of deformation, wear, or even breakage of the guide post and engaging block.

[0014] Furthermore, the cooperation between the fourth sidewall and the limiting component prevents the first torsion spring from excessively twisting due to the continued rotation of the first turntable. This prevents a decrease in the elastic recovery ability of the first torsion spring and avoids the situation where the first turntable fails to return to its original position. Otherwise, if the first turntable fails to return to its original position, the meshing block may not be able to completely disengage from the toothed groove of the geared component, causing abnormal interference between the meshing block and the geared component during subsequent door pushing, which could lead to end face wear, localized cracking, or even breakage.

[0015] Furthermore, during the process of the first turntable driving the second turntable to rotate in the unlocking direction, if the fourth sidewall and the limiting component lack the endpoint limiting effect, the second turntable may continue to rotate a short distance in the unlocking direction due to inertia after reaching the unlocking position, causing the guide post to disengage from the second sidewall of the guide groove. In this case, during the subsequent reset process of the first turntable, there may be a situation where the first turntable has already reset while the second turntable has not accurately returned to its predetermined position, meaning the third sidewall fails to engage with the limiting component in time. This causes the second turntable to continue rotating in the reset direction under inertia, preventing the meshing block from retracting stably and completely. This can also lead to abnormal interference and end-face wear between the meshing block and the geared component, and even damage to related parts.

[0016] Therefore, by setting a fourth sidewall, this solution allows the second turntable to engage with the limiting component at the exact moment of unlocking, thus restricting the second turntable from continuing to rotate inertia in the unlocking direction. Furthermore, the engagement between the guide post and the second sidewall restricts the first turntable from continuing to rotate, thereby avoiding problems such as over-unlocking, excessive torsion of the torsion spring, misalignment during reset, and incomplete retraction of the meshing block. This further improves the accuracy of the unlocking endpoint control, the reliability of the reset, and the overall service life of the device.

[0017] Optionally, the first turntable is provided with a positioning groove, and the two side walls of the positioning groove are the fifth side wall and the sixth side wall, respectively. When the guide post contacts the second side wall, the sixth side wall and the fourth side wall are flush; when the fourth side wall abuts against the limiting member, the sixth side wall abuts against the limiting member at the same time. When the third sidewall abuts against the limiting member, the fifth sidewall is flush with the third sidewall and abuts against the limiting member.

[0018] By adopting the above technical solution, when the first turntable rotates to the angle where it has just completed unlocking, although the fourth sidewall abuts against the limiting member and the cooperation between the guide post and the second sidewall can limit the first turntable from continuing to rotate in the unlocking direction, if the limiting is only achieved by the cooperation between the guide post and the second sidewall, the guide post will bear a large shear force or compressive force, which can easily lead to deformation, wear, or even breakage of the guide post. By setting a sixth sidewall and having it abut against the limiting member at the end of the unlocking process, the force preventing the first turntable from continuing to rotate can be mainly applied between the sixth sidewall and the limiting member, rather than mainly borne by the guide post, thereby reducing the force on the guide post and improving its reliability and service life during the unlocking process.

[0019] Similarly, when the first turntable returns to its initial position, although the third sidewall, after abutting against the limiting member, can restrict the first turntable from continuing to rotate in the reset direction through the cooperation of the guide post and the first sidewall, if only the cooperation of the guide post and the first sidewall is used for stopping at the moment the first turntable resets, the guide post will also be subjected to a large force. Over long-term use, this can easily lead to deformation, wear, or even breakage of the guide post. By providing a fifth sidewall, and ensuring that the fifth sidewall abuts against the limiting member when the first turntable is reset, the force preventing the first turntable from continuing to rotate in the reset direction can be mainly applied between the fifth sidewall and the limiting member, rather than primarily applied to the guide post. This further reduces the force on the guide post during the reset process and improves the protective effect of the guide post.

[0020] Therefore, this solution, by setting a positioning groove on the first turntable and having the fifth and sixth side walls of the positioning groove cooperate with the limiting component at the reset endpoint and the unlock endpoint respectively, can not only accurately limit the rotation endpoint of the first turntable, but also distribute the limiting load that might otherwise be concentrated on the guide post to the positioning groove and the limiting component. This effectively reduces the force on the guide post during the unlocking and reset processes, avoids deformation, wear and breakage of the guide post, and further improves the structural stability, reliability and overall service life of the device.

[0021] Optionally, a contact switch is provided on the mounting base, and a clearance groove is provided on the circumferential surface of the pull cord reel. When the first torsion spring is in its natural state, the contact switch is positioned opposite to the clearance groove. When the door lock is unlocked, the circumferential surface of the pull cord reel abuts against the contact switch, the contact switch closes, and the unlock indicator light illuminates.

[0022] By adopting the above technical solution, when the first torsion spring is in its natural state, the contact switch and the clearance groove are set opposite each other, and the pull coil will not trigger the contact switch at this time; when the pull coil rotates until the door lock is unlocked, the circumference of the pull coil abuts against the contact switch, causing the contact switch to close and drive the unlock indicator light to light up, so as to intuitively indicate that the current device is in the unlocked state, making it easy for the operator to judge whether the unlocking is in place in time, avoiding continued misoperation due to incomplete unlocking, and improving the convenience and reliability of the unlocking operation.

[0023] Optionally, the mounting base is provided with a stabilizing frame, the side of the stabilizing frame adjacent to the pull wire reel is curved and the circumferential surface of the pull wire reel is parallel, and a wire conduit is provided on the mounting base.

[0024] By adopting the above technical solution and setting up a stabilizing frame, the pull reel can be limited and supported, reducing the possibility of swaying or deviation during rotation, thereby improving the stability of the pull reel's rotation. Simultaneously, the side of the stabilizing frame facing the pull reel is designed as an arc surface adapted to the circumference of the pull reel, further enhancing its guiding and stabilizing effect. By setting up a guide tube, the wound wire or conductor can be guided and organized, preventing it from becoming scattered, deviating, or interfering with other components during use, thus improving the overall operational stability and service life of the device.

[0025] Optionally, the mounting base is provided with a mounting groove, the first turntable is provided with a telescopic column, the telescopic section of the telescopic column is connected to the pull wire plate, one end of the first torsion spring is wound around the telescopic column, and the other end of the first torsion spring is located in the mounting groove.

[0026] By adopting the above technical solution, and by setting a mounting groove on the mounting base and setting a telescopic column on the first turntable connected to the pull-wire disc, the pull-wire disc can move synchronously along the axial direction relative to the first turntable as it rotates with it. This adapts to the positional changes of the first torsion spring during torsion, improving the stability of the pull-wire disc during rotation. Simultaneously, the telescopic column not only serves as a guide and support structure for the movement of the pull-wire disc relative to the first turntable, but also as a connector between the pull-wire disc and the first turntable, ensuring that the pull-wire disc can rotate synchronously with the first turntable. Furthermore, one end of the first torsion spring is wound around the telescopic column, making the telescopic column also a fixing part for the first torsion spring, which simplifies the structure and improves the integration and assembly stability of the device.

[0027] Optionally, the pull rod is coaxially connected to an adjusting wheel, the adjusting wheel is provided with a plurality of ratchet teeth along its circumference, the adjusting wheel is also connected to a first lever and a second lever, the base is connected to a mounting cover, a third turntable is rotatably connected to the mounting cover, the third turntable is connected to a pawl, the adjusting wheel and the mounting cover are jointly connected to a second torsion spring, when the second torsion spring is in its natural state, the pawl is located in the tooth groove of the adjacent ratchet teeth, and one end of the first lever is provided with an avoidance component; It also includes a locking component, an unlocking component, and a reset component. The locking component can lock the third turntable, causing the second torsion spring to be in a torsional state and the pawl to separate from the ratchet. The unlocking component can unlock the locking component. The reset component can drive the third turntable to rotate and relock the locking component. When the first torsion spring is in its natural state, the locking assembly locks the third turntable; When the guide post is in contact with the second side wall, the first lever drives the avoidance component to control the unlocking component to unlock the locking component, at which time the pawl is engaged on the first ratchet tooth; When the door lock is just unlocked, the second lever controls the reset component to drive the third turntable to reset, so that the locking component relocks the third turntable; During the reset process of the adjustment wheel, the avoidance component can avoid the unlocking component.

[0028] By adopting the above technical solution, considering that when the operator rotates the knob to drive the pull rod, they not only need to drive the lead screw to rotate, but also need to overcome the displacement resistance of the door during the unlocking process, the operator often needs to apply considerable wrist force. For some operators, it may be difficult to apply continuous force to make the pull rod complete the entire unlocking stroke in one go, such as completing a rotation of about 90° in one go. To address this, this solution incorporates a one-way anti-reverse engagement structure of a pawl and ratchet, allowing the unlocking process to be performed in segments.

[0029] Specifically, during the unlocking process, when the guide post rotates to abut against the second side wall, the first lever activates the avoidance component to control the unlocking component to unlock the locking component. At this point, the pawl engages with the first ratchet tooth. As the pull plate continues to rotate, the pawl can sequentially engage with the grooves of adjacent ratchet teeth, thus creating a one-way anti-reverse action. Therefore, when rotating the pull plate, the operator does not need to continuously complete the entire unlocking angle at once. Instead, they can temporarily release their grip, adjust their hand posture and force after rotating one or several set angles, and then continue with subsequent rotations. Through the step-by-step engagement of multiple ratchet teeth, segmented unlocking operations can be achieved, thereby reducing the continuous force required for a single operation and improving the convenience of manual unlocking and its applicability to a wider range of users.

[0030] Furthermore, just as the pawl is about to separate from the last ratchet tooth, the adjusting wheel engages the second lever with the reset assembly, causing the reset assembly to rotate the third disc to reset. When the door lock has just unlocked, the pull cable simultaneously rotates the adjusting wheel until the second lever and reset assembly are engaged, causing the third disc to rotate to the reset position, and the locking assembly re-locks the third disc. This ensures that the segmented anti-reverse mechanism promptly exits its working state and enters the predetermined reset state when the door lock unlocks, guaranteeing smooth overall operation.

[0031] When the operator releases the knob, the pull cable reel resets under the action of the reset force, and the adjusting wheel, first lever, and second lever reset simultaneously. During the reset of the first lever, the avoidance component avoids the unlocking component, preventing it from mistakenly locking the locking component again. Thus, after the overall reset is complete, all components return to their initial standby state, ready for the next normal manual unlocking operation. Therefore, the operator does not need to complete the entire unlocking angle at once, but can gradually complete the manual unlocking by applying force in stages, reducing the difficulty of manual unlocking.

[0032] Optionally, the locking assembly includes a fixing sleeve fixed to the mounting cover, a plug rod slidably connected to the fixing sleeve, a first spring connected to the plug rod and the fixing sleeve, and a plug groove provided on the third turntable. When the first spring is in its natural state, the plug rod is inserted into the plug groove. The unlocking assembly includes a lifting rod and a telescopic rod. The telescopic rod is fixed to the mounting cover. The lifting rod is connected to both the plug rod and the telescopic section of the telescopic rod. The movable section and the fixed section of the telescopic rod are connected to a second spring. When the first spring is in its natural state, the second spring is also in its natural state. The plug rod is inserted into the plug slot.

[0033] By adopting the above technical solution, when the guide post rotates to abut against the second side wall during the unlocking process, the first lever drives the avoidance component to push against the telescopic rod, the telescopic rod drives the lifting rod to lift, the lifting rod drives the plug rod to lift, and the plug rod disengages from the plug groove. At this time, the first spring is in a compressed state, the second torsion spring is released from its torsion state and drives the third turntable to rotate, so that the pawl rests on the circumferential surface of the first ratchet. During the reset, the reset component drives the third turntable to rotate until the plug rod is aligned with the plug groove, thus completing the locking.

[0034] Optionally, the avoidance assembly includes a flip plate, which is rotatably connected to the first lever. A third torsion spring is provided on the rotation shaft of the flip plate. A baffle is provided on the first lever. A guide surface is provided on the side of the flip plate opposite to the baffle. When the adjusting wheel rotates in the torsional direction of the first torsion spring, the guide surface faces the telescopic rod. The guide surface can cooperate with the movable section of the telescopic rod to retract the telescopic rod. When the adjusting wheel is reset, the second spring is always in the natural state. The telescopic rod can abut against the flip plate and flip the flip plate. The reset assembly includes a fourth turntable, which is rotatably mounted on the mounting cover. The fourth turntable and the third turntable are provided with a synchronous belt, and an abutment block is provided on the fourth turntable. When the wedge block is inserted into the tooth groove of the gear, the second lever contacts the abutment block. When the door lock is unlocked, the second lever drives the abutment block and the fourth turntable to rotate to the required angle, so that the third turntable rotates until the insertion groove is opposite to the insertion rod.

[0035] By adopting the above technical solution, when unlocking, the adjusting wheel rotates along the torsion direction of the first torsion spring, the first lever rotates synchronously, and drives the flip plate to move to the position where the guide surface faces the movable section of the telescopic rod. At this time, the guide surface can cooperate with the movable section of the telescopic rod, causing the telescopic rod to retract, thereby enabling the unlocking component to smoothly release the locking component from the third turntable, ensuring that the third turntable can enter the unlocking working state.

[0036] When the wedge block is inserted into the tooth groove of the gear, the second lever is in contact with the abutment block on the fourth turntable. As the adjusting wheel continues to rotate, the second lever pushes the abutment block and drives the fourth turntable to rotate. The fourth turntable then drives the third turntable to rotate synchronously via the timing belt. When the door lock is unlocked, the second lever drives the fourth turntable to a predetermined angle and causes the third turntable to rotate synchronously to the position where the insertion slot and the insertion rod are opposite.

[0037] When the operator releases the knob and the adjusting wheel begins to reset, the telescopic rod can directly contact the flip plate and push the flip plate to flip because the second spring is always in its natural state, without having to retract the telescopic rod again. This allows the avoidance component to stop controlling the locking component to unlock during the reset process.

[0038] This application also provides a door for urban rail vehicles, which uses the aforementioned screw end unlocking device.

[0039] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting the cooperation relationship between the limiting groove and the limiting component, the relevant turntable can be accurately limited during the reset process after unlocking, avoiding the turntable from continuing to rotate excessively in the reset or unlocking direction due to inertia. This avoids the situation where the meshing block is not reset in place or even partially extended. In turn, it avoids abnormal pressure, end face wear, or even breakage or fracture of the end of the meshing block or gear when the door is manually pushed later. This improves the reliability of the unlocking device reset and its overall service life. 2. By setting the positioning groove and its fifth and sixth side walls in cooperation with the limiting component, the limiting function of the first turntable at the unlocking end point and the reset end point is mainly borne by the positioning groove and the limiting component, rather than mainly by the guide column. This reduces the shear force and extrusion force on the guide column, avoids deformation, wear or even breakage of the guide column, and improves the service life of the device. 3. By setting a one-way anti-reverse engagement structure between the pawl and the ratchet, the operator does not need to continuously rotate the pull rod to complete the entire unlocking angle at once during the manual unlocking process. Instead, the operator can gradually complete the unlocking by applying force in segments. This makes it easier for the operator to adjust their hand posture after rotating a certain angle before continuing the operation, thereby reducing the difficulty of unlocking and improving the convenience and applicability of manual unlocking. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0041] Figure 2 This is a schematic diagram of the structure of the mounting base, rotating shaft sleeve, first turntable and second turntable assembly in Embodiment 1 of this application.

[0042] Figure 3 This is an exploded view of the overall structure, as shown in Embodiment 1 of this application.

[0043] Figure 4 This is a schematic diagram of the structure of the first sidewall, the second sidewall, the fifth sidewall, and the sixth sidewall, as shown in Embodiment 1 of this application.

[0044] Figure 5 This is a schematic diagram of the structure of the third and fourth sidewalls in Embodiment 1 of this application.

[0045] Figure 6 This is a schematic diagram of the structure of the mounting cover used in Embodiment 2 of this application.

[0046] Figure 7 This is a schematic diagram of the structure of the locking component, unlocking component, avoidance component and reset component in Embodiment 2 of this application.

[0047] Figure 8 yes Figure 7 Enlarged view of part A.

[0048] Figure 9 This is a schematic diagram of the structure of the second torsion spring, as shown in Embodiment 2 of this application.

[0049] Explanation of reference numerals in the attached drawings: 1. Mounting base; 11. Mounting groove; 12. Limiting component; 13. Contact switch; 14. Stabilizer; 2. Rotary shaft sleeve; 3. Geared component; 4. First turntable; 41. Guide groove; 411. First side wall; 412. Second side wall; 42. Positioning groove; 421. Fifth side wall; 422. Sixth side wall; 43. Telescopic column; 5. Second turntable; 51. Sliding groove; 52. Engaging block; 53. Guide column; 54. Limiting groove; 541. Third side wall; 542. Fourth side wall; 6. Pull cable reel; 61. First torsion spring; 62. Relief groove; 63. Adjusting wheel; 64. Racket; 65. First lever; 66. Second lever; 67. Mounting cover; 68. Third turntable; 681. Insertion slot; 69. Pawl; 610. Second torsion spring; 7. Locking assembly; 71. Fixing sleeve; 72. Insertion rod; 73. First spring; 8. Unlocking assembly; 81. Lifting rod; 82. Telescopic rod; 83. Second spring; 9. Avoidance assembly; 91. Flip plate; 911. Guide surface; 92. Third torsion spring; 93. Baffle; 10. Reset assembly; 101. Fourth turntable; 102. Synchronous belt; 103. Abutment block. Detailed Implementation

[0050] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail. Example

[0051] This application discloses a lead screw end unlocking device.

[0052] like Figure 1 and Figure 2 As shown, this embodiment provides a lead screw end unlocking device, including a mounting base 1, a rotating shaft sleeve 2, a geared component 3, a first turntable 4, a second turntable 5, and a pull wire disc 6.

[0053] The mounting base 1 is used for fixed installation on the vehicle, and a variable-diameter stepped channel is formed inside the mounting base 1. A bearing is fitted inside the smaller diameter portion of the variable-diameter stepped channel, and a rotating sleeve 2 is inserted into the bearing and rotatably positioned relative to the mounting base 1. Preferably, the rotating sleeve 2 can be a variable-diameter shaft structure, and the bearing in the mounting base 1 is axially fixed by a snap ring secured to the rotating sleeve 2. The inner end of the rotating sleeve 2 is used to connect to a lead screw in the vehicle door system to drive the lead screw to rotate during unlocking.

[0054] The geared component 3 is coaxially fixed to the rotating sleeve 2. The geared component 3 can be a gear or a ratchet. In this embodiment, the geared component 3 is preferably a ratchet. The connection between the geared component 3 and the rotating sleeve 2 can be a key connection, an interference fit, or a snap-fit ​​connection.

[0055] The first turntable 4 and the second turntable 5 are fitted inside the larger diameter section of the variable-diameter stepped channel. Both the first turntable 4 and the second turntable 5 are annular structures and are coaxially arranged with the variable-diameter stepped channel. The geared component 3 is located between the second turntable 5 and the rotating shaft sleeve 2, and the second turntable 5 is located between the first turntable 4 and the stepped surface of the variable-diameter stepped channel. The pull-wire disc 6 is connected to the side of the first turntable 4 away from the second turntable 5 via a telescopic column 43. The first turntable 4, the second turntable 5, the rotating shaft sleeve 2, and the pull-wire disc 6 are all coaxially arranged with the mounting base 1. Preferably, the first turntable 4 and the pull-wire disc 6 are both fitted onto the rotating shaft sleeve 2 through bearings and retaining springs, thereby enabling them to rotate smoothly relative to the rotating shaft sleeve 2; at the same time, the pull-wire disc 6 is connected to the first turntable 4 via the telescopic column 43 to ensure that the pull-wire disc 6 rotates synchronously with the first turntable 4 and allows the pull-wire disc 6 to move axially relative to the first turntable 4.

[0056] like Figure 3 , Figure 4 and Figure 5 The second turntable 5 has three sliding grooves 51 on the side facing the first turntable 4. The three sliding grooves 51 are arranged at equal intervals along the circumference of the second turntable 5, and each sliding groove 51 extends radially along the second turntable 5. A meshing block 52 is slidably disposed in each sliding groove 51. The meshing block 52 is connected to a guide post 53, so that both the guide post 53 and the meshing block 52 can move radially along the second turntable 5. In this embodiment, the meshing block 52 is a wedge-shaped block adapted to the ratchet, so as to be inserted into the tooth groove of the gear member 3 and form a transmission engagement; in other embodiments, when the gear member 3 is a gear structure, the meshing block 52 can also adopt other adapted structures such as triangular pointed teeth.

[0057] The first turntable 4 has three guide grooves 41 on the side facing the second turntable 5. Each guide groove 41 corresponds to one of the three guide posts 53, with each guide post 53 inserted into its corresponding guide groove 41. The guide grooves 41 are preferably arc-shaped, with the two side walls being a first side wall 411 and a second side wall 412. When a guide post 53 contacts the first side wall 411, the meshing block 52 is in a radially inward retracted state, separating from the tooth groove of the geared component 3. When a guide post 53 contacts the second side wall 412, the meshing block 52 is in a radially outward moving state, inserting into the tooth groove of the geared component 3, thus establishing a transmission relationship between the second turntable 5 and the geared component 3.

[0058] The mounting base 1 has a mounting groove 11, and the end of the pull cable reel 6 has a groove. A first torsion spring 61 is installed in the groove of the pull cable reel 6. One end of the first torsion spring 61 is wound around the telescopic column 43, and the other end is placed in the mounting groove 11, so that the first torsion spring 61 can apply a reset torque to the pull cable reel 6 and the first turntable 4.

[0059] The first turntable 4 has a positioning groove 42 on its circumference, and the second turntable 5 has a limiting groove 54 on its circumference, with the arc length of the limiting groove 54 being less than the arc length of the positioning groove 42. A limiting member 12 is provided inside the mounting base 1. In this embodiment, the limiting member 12 is a protrusion on the inner wall of the mounting base 1, preferably a triangular prism structure, and is integrally formed with the mounting base 1. Of course, in other embodiments, the limiting member 12 can also adopt other structural forms that can achieve the stopping and limiting function.

[0060] The two side walls of the limiting groove 54 are respectively the third side wall 541 and the fourth side wall 542, and the two side walls of the positioning groove 42 are respectively the fifth side wall 421 and the sixth side wall 422.

[0061] When the first torsion spring 61 is in its natural state, the third sidewall 541 is flush with the fifth sidewall 421, and both the third sidewall 541 and the fifth sidewall 421 abut against the limiting member 12; at the same time, the guide post 53 abuts against the first sidewall 411, and at this time the meshing block 52 separates from the tooth groove of the gear member 3, and the device is in the initial standby state.

[0062] When the operator rotates the pull reel 6, the pull reel 6 synchronously drives the first turntable 4 to rotate. As the first turntable 4 rotates, the guide groove 41 pushes the guide post 53 to move radially. When the first turntable 4 rotates until the fourth side wall 542 is exactly flush with the sixth side wall 422, the guide post 53 abuts against the second side wall 412. At this time, the meshing block 52 is just inserted into the tooth groove of the geared component 3, and a transmission connection is established between the second turntable 5 and the geared component 3.

[0063] After the fourth side wall 542 and the sixth side wall 422 are exactly aligned, when the cable pull plate 6 is rotated, the first turntable 4 drives the second turntable 5 to rotate synchronously through the guide post 53. The second turntable 5 then drives the geared component 3 to rotate through the meshing block 52, which in turn drives the rotating shaft sleeve 2 and the lead screw connected to the rotating shaft sleeve 2 to rotate, thereby starting to unlock the vehicle door.

[0064] When the fourth side wall 542 and the sixth side wall 422 simultaneously abut against the limiting member 12, the rotating sleeve 2 just completes the unlocking of the vehicle door. At this time, the cooperation between the fourth side wall 542 and the limiting member 12 can restrict the second turntable 5 from continuing to rotate in the unlocking direction, and the cooperation between the sixth side wall 422 and the limiting member 12 can restrict the first turntable 4 from continuing to rotate in the unlocking direction, thereby preventing the guide post 53, the engaging block 52, or the first torsion spring 61 from being subjected to excessive load due to continued forced rotation of the cable pull plate 6.

[0065] After unlocking, the operator releases the pull cable reel 6, and the first torsion spring 61 drives the pull cable reel 6 and the first turntable 4 to rotate in the reset direction. During the reset process, the guide groove 41 first drives the guide post 53 to move radially back, causing the meshing block 52 to disengage from the tooth groove of the geared component 3; then, the first turntable 4 continues to drive the second turntable 5 to rotate until the third side wall 541 and the fifth side wall 421 re-abut against the limiting component 12, so that both the first turntable 4 and the second turntable 5 accurately return to their initial positions, completing the overall reset.

[0066] In other embodiments, the limiting member 12 does not necessarily have to adopt the above-mentioned protruding block structure; for example, it can also adopt other structural forms such as a "7"-shaped limiting post. Furthermore, it is not necessarily required that the fourth side wall 542 and the sixth side wall 422 abut against the limiting member 12 in a completely flush state, nor is it necessarily required that the third side wall 541 and the fifth side wall 421 abut against the limiting member 12 in a completely flush state. By reasonably adjusting the structural shape of the limiting member 12 and the initial relative positions of the first turntable 4 and the second turntable 5, it is also possible to achieve the following: when the vehicle door is just unlocked, the fourth side wall 542 and the sixth side wall 422 together or separately form a stop engagement with the limiting member 12; when the cable tray 6 is reset, the third side wall 541 and the fifth side wall 421 together or separately form a stop engagement with the limiting member 12.

[0067] The rotation of the cable reel 6 is primarily achieved by the wire wound within its guide groove. A stabilizing frame 14 is provided on the mounting base 1. The side of the stabilizing frame 14 adjacent to the cable reel 6 is designed as an arc-shaped structure parallel to the circumference of the cable reel 6, providing support and guidance for the cable reel 6. A wire conduit is also provided on the mounting base 1, through which the wire wound on the cable reel 6 passes. Since the manual unlocking mechanism on vehicles is typically a knob, it is preferable to provide two wire conduits, allowing the two ends of the wire to pass through corresponding wire conduits and be fixed to the knob on the vehicle. By rotating the knob on the vehicle, the cable reel 6 can be rotated, thereby completing the manual unlocking of the screw end.

[0068] In addition, a contact switch 13 is provided on the mounting base 1, and a clearance groove 62 is provided on the circumferential surface of the pull cord 6. When the first torsion spring 61 is in its natural state, the contact switch 13 and the clearance groove 62 are positioned opposite each other, and the pull cord 6 will not trigger the contact switch 13 at this time. When the door lock is unlocked, the circumferential surface of the pull cord 6 abuts against the contact switch 13, causing the contact switch 13 to close, thereby illuminating the unlock indicator light to indicate to the operator that the device is currently in the unlocked state. Specifically, the arc length of the clearance groove 62 can be set according to actual needs: when the arc length of the clearance groove 62 is small, the pull cord 6 can contact the contact switch 13 during the unlocking stroke; when the arc length of the clearance groove 62 is large, the pull cord 6 can contact the contact switch 13 only when the unlocking is just completed, so as to achieve a more accurate unlocking status indication.

[0069] This embodiment also provides a door for urban rail vehicles, including a door body, a drive screw, and a screw end unlocking device as described in the above embodiment, wherein the screw end unlocking device is disposed at the end of the drive screw and is connected to the drive screw in a transmission manner.

[0070] When the vehicle is powered normally, the drive screw can rotate under the drive mechanism to realize the opening, closing and locking of the door. In the event of a power failure or when manual unlocking is required, the operator can use the manual unlocking device on the vehicle to drive the unlocking device at the end of the screw, so that the unlocking device at the end of the screw can drive the drive screw to rotate a predetermined angle, thereby unlocking the locking mechanism of the urban rail vehicle door, and then the door can be opened manually.

[0071] The implementation principle of this application embodiment is as follows: When manual unlocking is required, the knob connected to the cable reel 6 on the vehicle can be rotated, or the cable can be pulled directly, causing the cable reel 6 to drive the first turntable 4 to rotate. As the first turntable 4 rotates, the guide groove 41 pushes the guide post 53 to move radially. When the guide post 53 abuts against the second side wall 412 of the guide groove 41, the meshing block 52 inserts into the tooth groove of the geared component 3, thereby establishing a transmission relationship between the first turntable 4, the second turntable 5, and the geared component 3. Subsequently, the first turntable 4 continues to rotate and drives the second turntable 5 to rotate synchronously, which in turn drives the geared component 3, the rotating shaft sleeve 2, and the lead screw to rotate, thereby unlocking the door lock.

[0072] When unlocking is complete, the fourth sidewall 542 on the second turntable 5 abuts against the limiting member 12, restricting the continued rotation of the second turntable 5 in the unlocking direction; simultaneously, the sixth sidewall 422 on the first turntable 4 also abuts against the limiting member 12, thereby restricting the continued rotation of the first turntable 4 in the unlocking direction. This prevents the pull cord 6 from being forcibly rotated after unlocking, causing the screw to continue moving in the direction of opening the door, and also avoids the guide post 53 and the engaging block 52 from being subjected to excessive shearing or compressive forces, while preventing the first torsion spring 61 from being excessively torsion.

[0073] After the operator releases the knob or winds the cord, the first torsion spring 61 drives the pull-cord disc 6 and the first turntable 4 to rotate in the reset direction. During the reset process, the guide groove 41 first drives the guide post 53 to move radially back, causing the meshing block 52 to disengage from the tooth groove of the geared component 3, thereby disengaging the transmission connection; subsequently, the first turntable 4 continues to drive the second turntable 5 to rotate in the reset direction until the third side wall 541 on the second turntable 5 abuts against the limiting component 12, while the fifth side wall 421 on the first turntable 4 also abuts against the limiting component 12, thereby completing the reset limiting of the second turntable 5 and the first turntable 4 respectively.

[0074] Through the above structural coordination, on the one hand, it can prevent the second turntable 5 from continuing to rotate due to inertia after unlocking or during the reset process, and prevent the meshing block 52 from still partially or even fully extending after reset, thus avoiding abnormal interference, end face wear or local cracking between it and the geared component 3; on the other hand, the limiting effect of the unlocking end point and the reset end point is mainly borne by the relevant side walls and limiting components 12, rather than mainly by the guide post 53, thereby effectively reducing the force on the guide post 53, avoiding deformation, wear or even breakage of the guide post 53, and improving the reset reliability, structural stability and overall service life of the device. Example

[0075] Reference Figure 6 , Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 is that, based on embodiment 1, a locking component 7, an unlocking component 8, a clearance component 9, and a reset component 10 are further provided so that the operator can manually unlock the door by applying force in stages, and the relevant components can be automatically restored to the initial standby state after the door lock is unlocked.

[0076] Reference Figure 7 , Figure 8 and Figure 9 Specifically, the pull-line disc 6 is coaxially connected to an adjusting wheel 63, which has several ratchet teeth 64 along its circumference. A first lever 65 and a second lever 66 are also connected to the adjusting wheel 63. A mounting cover 67 is connected to the mounting base 1, and a third turntable 68 is rotatably connected to the mounting cover 67. A pawl 69 is provided on the third turntable 68. A second torsion spring 610 is connected between the adjusting wheel 63 and the mounting cover 67. The locking assembly 7 can lock the third turntable 68. When the third turntable 68 is locked, the second torsion spring 610 is in a torsional energy storage state, and the pawl 69 disengages from the ratchet teeth 64 on the adjusting wheel 63.

[0077] In this embodiment, the locking component 7 includes a fixing sleeve 71, which is fixed to the mounting cover 67. A plug-in rod 72 is slidably connected inside the fixing sleeve 71, and a first spring 73 is connected between the plug-in rod 72 and the fixing sleeve 71. The third turntable 68 has a plug-in groove 681 that matches the plug-in rod 72. When the first spring 73 is in its natural state, the plug-in rod 72 is inserted into the plug-in groove 681, thereby locking the third turntable 68.

[0078] The unlocking assembly 8 includes a lifting rod 81 and a telescopic rod 82. The telescopic rod 82 is fixed to the mounting cover 67. The lifting rod 81 is connected to both the insertion rod 72 and the movable section of the telescopic rod 82. A second spring 83 connects the movable and fixed sections of the telescopic rod 82. When the first spring 73 is in its natural state, the second spring 83 is preferably also in its natural state. At this time, the insertion rod 72 is stably inserted into the insertion slot 681, and the third turntable 68 remains locked.

[0079] The avoidance assembly 9 includes a flip plate 91, which is rotatably connected to the first lever 65. A third torsion spring 92 is mounted on the rotating shaft of the flip plate 91, and a baffle 93 is mounted on the first lever 65. A guide surface 911 is provided on the side of the flip plate 91 facing away from the baffle 93. When the adjusting wheel 63 rotates along the torsion direction of the first torsion spring 61, the guide surface 911 faces the telescopic rod 82 and can cooperate with the movable section of the telescopic rod 82, causing the telescopic rod 82 to retract. This, in turn, drives the insertion rod 72 out of the insertion slot 681 via the lifting rod 81, thereby unlocking the locking assembly 7.

[0080] The reset assembly 10 includes a fourth turntable 101, which is rotatably mounted on the mounting cover 67. A synchronous belt 102 is provided between the fourth turntable 101 and the third turntable 68. An abutment block 103 is provided on the fourth turntable 101. Through the transmission cooperation between the fourth turntable 101, the synchronous belt 102, and the third turntable 68, the third turntable 68 can be driven to rotate back to the locked position at an appropriate time.

[0081] The working process of this embodiment is as follows: In the initial state, the first torsion spring 61 is in its natural state, the locking component 7 locks the third turntable 68, the second torsion spring 610 is in a torsional energy storage state, and the pawl 69 is separated from the ratchet 64. At this time, the first turntable 4, the second turntable 5, the meshing block 52, and the geared component 3 are in the initial standby state.

[0082] When the operator manually unlocks the device by rotating the pull-coil 6, the pull-coil 6 synchronously drives the adjusting wheel 63, the first lever 65, and the second lever 66 to rotate; at the same time, the first turntable 4 rotates synchronously. When the guide post 53 just abuts against the second side wall 412 of the guide groove 41, it indicates that the meshing block 52 has entered the tooth groove of the gear component 3. At this time, the first lever 65 drives the flip plate 91 to move, and the guide surface 911 on the flip plate 91 pushes the movable section of the telescopic rod 82 to retract. The telescopic rod 82 drives the insertion rod 72 to exit the insertion groove 681 on the third turntable 68 via the lifting rod 81, thereby releasing the locking component 7 from locking the third turntable 68. After the third turntable 68 is unlocked, the second torsion spring 610 releases torque, causing the third turntable 68 to rotate and drive the pawl 69 to engage with the tooth surface of the first ratchet 64, thereby forming a one-way anti-reverse engagement between the pawl 69 and the ratchet 64 on the adjusting wheel 63.

[0083] Therefore, as the pull plate 6 and adjusting wheel 63 continue to rotate, the pawl 69 can sequentially engage with the grooves of adjacent ratchet teeth 64, thus creating a segmented, one-way anti-reverse effect. In other words, the operator does not need to apply continuous force to complete the entire unlocking angle at once, but can temporarily release the grip or adjust the force application posture after rotating a certain angle before continuing to the next segment of rotation, thereby reducing the difficulty of manual unlocking.

[0084] When the pawl 69 engages with the groove of the last ratchet 64, the cable reel 6 has rotated more than 70°, meaning the door lock is about to unlock. At this point, the second lever 66 contacts the abutment block 103 on the fourth turntable 101. As the adjusting wheel 63 continues to rotate, the second lever 66 pushes the abutment block 103, causing the fourth turntable 101 to rotate. The fourth turntable 101 then drives the third turntable 68 to rotate synchronously via the timing belt 102. When the door lock has just unlocked, the second lever 66 moves the fourth turntable 101 to a predetermined angle, causing the third turntable 68 to rotate until its insertion slot 681 is once again aligned with the insertion rod 72. At this point, under the action of the first spring 73, the insertion rod 72 re-inserts into the insertion slot 681, and the locking assembly 7 re-locks the third turntable 68, thus returning the third turntable 68 to the locked state. At this time, the pawl 69 is also completely separated from the ratchet 64.

[0085] Then, after the operator releases the knob, the pull plate 6, the first turntable 4, and the adjusting wheel 63 begin to reset under the action of the first torsion spring 61. Since the third turntable 68 has been relocked at this time, the second torsion spring 610 is back in the torsional energy storage state, and the pawl 69 separates from the ratchet 64, thus not hindering the reset of the adjusting wheel 63. At the same time, during the reset process of the adjusting wheel 63, the flip plate 91 can form a clearance engagement with the telescopic rod 82, that is, the side of the flip plate 91 facing away from its guide surface 911 abuts against the moving section of the telescopic rod 82. The flipping will gradually move towards the first lever 65 as the third turntable 68 rotates back, so that the telescopic rod 82 does not need to retract again, thereby preventing the unlocking component 8 from mistakenly locking the locking component 7 again. Thus, after completing one manual unlocking, the entire mechanism can smoothly return to the initial standby state for normal use next time.

[0086] Therefore, by setting up the adjusting wheel 63, pawl 69, third turntable 68, locking component 7, unlocking component 8, avoidance component 9 and reset component 10, this embodiment not only improves the manual unlocking process from a one-time continuous force application to a segmented force application, thus improving the ease of operation, but also ensures that the anti-reverse mechanism can promptly exit and relock after the door lock is just unlocked, guaranteeing that the entire device can smoothly complete the "unlock-anti-reverse-reset-relock" action cycle, thereby improving the reliability and stability of the device in repeated use.

[0087] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lead screw end unlocking device, comprising a pull rod reel (6), a first turntable (4), a second turntable (5), a rotating bushing (2), and a mounting base (1), wherein the rotating bushing (2) is rotatably disposed within the mounting base (1), the rotating bushing (2) is connected to the lead screw, and a geared component (3) is coaxially connected to the rotating bushing (2); both the first turntable (4) and the second turntable (5) are rotatably disposed within the mounting base (1); the pull rod reel (6) is connected to the mounting base (1) via a first torsion spring (61); the pull rod reel (6) is connected to the first turntable (4); and a plurality of guide posts (53) are slidably disposed on the second turntable (5). The guide posts (53) all move radially along the second turntable (5). The guide posts (53) are connected to the meshing blocks (52). The first turntable (4) has several guide grooves (41). The guide posts (53) correspond one-to-one with the guide grooves (41). The two side walls of the guide grooves (41) are the first side wall (411) and the second side wall (412), respectively. When the guide post (53) contacts the first side wall (411), the meshing block (52) separates from the tooth groove of the geared component (3). When the guide post (53) contacts the second side wall (412), the meshing block (52) is inserted into the tooth groove of the geared component (3). Its features are: The second turntable (5) has a limiting groove (54) and the mounting base (1) is provided with a limiting component (12). The limiting groove (54) has two side walls that are arranged opposite to each other. When the first torsion spring (61) is in its natural state, the side wall of the limiting groove (54) that contacts the limiting member (12) is the third side wall (541). The third side wall (541) restricts the second turntable (5) from rotating in the direction of the first torsion spring (61)'s reset rotation, and at this time the guide post (53) abuts against the first side wall (411).

2. The lead screw end unlocking device according to claim 1, characterized in that: The other side wall of the second limiting groove (54) is the fourth side wall (542). When the second turntable (5) rotates to the point where the screw drives the door lock to unlock, the fourth side wall (542) abuts against the limiting member (12).

3. The lead screw end unlocking device according to claim 2, characterized in that: The first turntable (4) has a positioning groove (42), and the two side walls of the positioning groove (42) are the fifth side wall (421) and the sixth side wall (422), respectively. When the guide post (53) contacts the second side wall (412), the sixth side wall (422) and the fourth side wall (542) are flush. When the fourth side wall (542) abuts against the limiting member (12), the sixth side wall (422) abuts against the limiting member (12) at the same time. When the third sidewall (541) abuts against the limiting member (12), the fifth sidewall (421) is flush with the third sidewall (541) and abuts against the limiting member (12).

4. The lead screw end unlocking device according to claim 1, characterized in that: A contact switch (13) is provided on the mounting base (1). A clearance groove (62) is provided on the circumferential surface of the pull cord plate (6). When the first torsion spring (61) is in its natural state, the contact switch (13) is positioned opposite to the clearance groove (62). When the door lock is unlocked, the circumferential surface of the pull cord plate (6) abuts against the contact switch (13), the contact switch (13) closes, and the unlock indicator light illuminates.

5. The lead screw end unlocking device according to claim 1, characterized in that: The mounting base (1) is provided with a stabilizing frame. The side of the stabilizing frame adjacent to the pull wire reel (6) is an arc surface and the circumference of the pull wire reel (6) is parallel. The mounting base (1) is provided with a wire conduit.

6. The lead screw end unlocking device according to claim 1, characterized in that: The mounting base (1) has a mounting groove (11), the first turntable (4) has a telescopic column, the telescopic section of the telescopic column is connected to the pull wire disc (6), one end of the first torsion spring (61) is wound around the telescopic column, and the other end of the first torsion spring (61) is located in the mounting groove (11).

7. The lead screw end unlocking device according to claim 1, characterized in that: The pull-out reel (6) is coaxially connected to an adjusting wheel (63). The adjusting wheel (63) has several ratchet teeth (64) arranged along its circumference. The adjusting wheel (63) is also connected to a first lever (65) and a second lever (66). The mounting base (1) is connected to a mounting cover (67). A third turntable (68) is rotatably connected to the mounting cover (67). The third turntable (68) is connected to a pawl (69). The adjusting wheel (63) and the mounting cover (67) are connected to a second torsion spring (610). When the second torsion spring (610) is in its natural state, the pawl (69) is located in the tooth groove of the adjacent ratchet teeth (64). One end of the first lever (65) is provided with a clearance component (9). It also includes a locking component (7), an unlocking component (8), and a reset component (10). The locking component (7) can lock the third turntable (68), so that the second torsion spring (610) is in a torsional state and the pawl (69) is separated from the ratchet (64). The unlocking component (8) can unlock the locking component (7). The reset component (10) can drive the third turntable (68) to rotate and make the locking component (7) lock again. When the first torsion spring (61) is in its natural state, the locking assembly (7) locks the third turntable (68); When the guide post (53) is in contact with the second side wall (412), the first lever (65) drives the avoidance component (9) to control the unlocking component (8) to unlock the locking component (7), and at this time the pawl (69) is on the first ratchet (64); When the door lock is just unlocked, the second lever (66) controls the reset component (10) to drive the third turntable (68) to reset, so that the locking component (7) relocks the third turntable (68); During the reset process of the adjusting wheel (63), the avoidance component (9) can avoid the unlocking component (8).

8. The lead screw end unlocking device according to claim 7, characterized in that: The locking assembly (7) includes a fixing sleeve (71) which is fixed on the mounting cover (67). The fixing sleeve (71) is slidably connected to a plug rod (72). The plug rod (72) and the fixing sleeve (71) are connected together to a first spring (73). The third turntable (68) has a plug groove (681). When the first spring (73) is in its natural state, the plug rod (72) is inserted into the plug groove (681). The unlocking component (8) includes a lifting rod (81) and a telescopic rod (82). The telescopic rod (82) is fixed on the mounting cover (67). The lifting rod (81) is connected to both the plug rod (72) and the telescopic section of the telescopic rod (82). The movable section and the fixed section of the telescopic rod (82) are connected to a second spring (83). When the first spring (73) is in its natural state, the second spring (83) is in its natural state, and the plug rod (72) is inserted into the plug slot (681).

9. The lead screw end unlocking device according to claim 8, characterized in that: The avoidance component (9) includes a flip plate (91), which is rotatably connected to the first lever (65). A third torsion spring (92) is provided on the rotating shaft of the flip plate (91). A baffle (93) is provided on the first lever (65). A guide surface (911) is provided on the side of the flip plate (91) away from the baffle (93). When the adjusting wheel (63) rotates in the torsional direction of the first torsion spring (61), the guide surface (911) faces the telescopic rod (82). The guide surface (911) can cooperate with the movable section of the telescopic rod (82) to retract the telescopic rod (82). When the adjusting wheel (63) is reset, the second spring (83) is always in the natural state. The telescopic rod (82) can abut against the flip plate (91) and flip the flip plate (91) to flip. The reset assembly (10) includes a fourth turntable (101), which is rotatably mounted on the mounting cover (67). The fourth turntable (101) and the third turntable (68) are provided with a synchronous belt (102). An abutment block (103) is provided on the fourth turntable (101). When the wedge block is inserted into the tooth groove of the geared component (3), the second lever (66) contacts the abutment block (103). When the door lock is unlocked, the second lever (66) drives the abutment block (103) and the fourth turntable (101) to rotate to the required angle, so that the third turntable (68) rotates to the position where the insertion slot (681) is opposite to the insertion rod (72).

10. A door for urban rail vehicles, characterized in that: Includes the lead screw end unlocking device as described in any one of claims 1-9.

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