A passive locking device and a double-locking structure for an orbital vehicle door system

Abstract

The present invention discloses a passive locking device and a double-locking structure for a rail vehicle door system. The device includes a slide rail, and a lead screw is installed outside the slide rail. A first nut assembly is sleeved on the lead screw. The first nut assembly includes a rolling pin, a slider, a nut sleeve and a nut. The nut is made of a non-metallic material. The inner wall of the nut cooperates with the lead screw, and the nut sleeve is fixedly sleeved on the outer wall of the nut. One end of the nut sleeve is equipped with the slider, and the other end is equipped with the rolling pin. The slider drives the first nut assembly to move along the slide rail. A locking pin limiting block is arranged above the slide rail. It also includes a slider block installed in the locking section. The slide rail is provided with an opening in the locking section. When the slider moves to the locking section, it exits from the opening, and the rolling pin falls into the inner side of the locking pin limiting block to achieve locking. After the slider exits, it is blocked by the slider block to achieve locking limit. In this solution, the lead screw directly cooperates with the nut made of non-metallic material, reducing the requirements for the material and hardness of the lead screw, and enabling lubrication-free operation throughout the life cycle.

Description

Technical Field

[0001] The present invention relates to rail transit technology, and particularly to a passive locking device for a door system of a rail vehicle. Background Art

[0002] At present, door systems using multi-screw drive mechanisms are widely applied in rail transit vehicles. All door systems using screw drives have problems of locking and unlocking of the door system, that is, a screw rod is used to drive the door system by a screw drive mechanism, and after the door is closed, the screw rod can still rotate, and only by applying a certain external force can the door system be unlocked, which has certain potential safety hazards.

[0003] At present, the locking device of the screw drive door system utilizes the change of the screw helix angle of the screw rod, and cooperates with an adaptive nut to lock the rolling pin in the nut, so that the door system realizes passive locking through the change of the screw lead. However, this locking device has high requirements for the screw helix symmetry and needs to be lubricated regularly. The hardness matching requirements of the rolling pin and the screw rod are also relatively strict. Otherwise, the replacement cost is high after the locking section of the screw rod is worn. Summary of the Invention

[0004] Object of the Invention: The object of the present invention is to provide a passive locking device for a door system of a rail vehicle. In this solution, the screw rod directly cooperates with a nut made of a non-metallic material, which reduces the requirements for the screw rod material and hardness, and can achieve lubrication-free operation throughout the life cycle.

[0005] Technical Solution: The present invention includes a slider guide rail arranged on a bottom plate, a screw rod is installed outside the slider guide rail, and a driving device is installed at the end of the screw rod; a first nut assembly is sleeved on the screw rod, and the first nut assembly includes a rolling pin, a slider, a nut sleeve and a nut, wherein the nut is a non-metallic material nut; the inner wall of the nut cooperates with the screw rod, and the outer wall of the nut is fixedly sleeved with a nut sleeve; one end of the nut sleeve is installed with a slider, and the other end is installed with a rolling pin. The slider cooperates with the slider guide rail to drive the first nut assembly to move along the slider guide rail; a locking pin limiting block is arranged on the bottom plate above the slider guide rail for cooperating with the rolling pin to realize locking; a slider stop block is further included and installed in the locking section. The slider guide rail is provided with an opening in the locking section. When the slider moves to the locking section, the slider exits from the opening of the slider guide rail, and the rolling pin falls into the inner side of the locking pin limiting block to realize locking; after the slider exits from the slider guide rail, it is blocked by the slider stop block to realize locking limit.

[0006] The locking pin limiting block is provided with a stepped structure, and the plane of the locking pin limiting block for contacting the rolling pin is set as an inclined plane. When the rolling pin falls into the inner side of the locking pin limiting block, the outer wall of the rolling pin is completely attached to the inclined plane, forming a line-plane contact to improve the locking effect.

[0007] The slider stopper adopts a bending structure. The upper half of the slider stopper is fixed inside the slider guide rail, and its lower half is suspended. When the slider exits the slider guide rail, the suspended part is blocked by the slider stopper, preventing it from continuing to move in the door-closing direction, thus achieving locking and limiting.

[0008] The first nut assembly further includes a nut seat. The nut seat is made of metal. The nut seat is sleeved on the lead screw. The nut seat cooperates with the nut sleeve and rotates radially. The nut seat is connected to the door panel to achieve the locking of the vehicle door.

[0009] A torsion spring is installed between the nut seat and the nut sleeve, which can achieve rotational angle limitation and energy storage.

[0010] The lead screw and the driving device are both fixedly installed on the bottom plate through the mounting seat, realizing the firm installation of the lead screw and the driving device.

[0011] The present invention further includes a double-locking structure. The locking structure includes two passive locking devices for the rail vehicle door system. The driving device simultaneously drives the two passive locking devices. Two sections of threads are arranged in reverse on the lead screw. When the lead screw rotates, the two nut assemblies move towards the middle of the lead screw simultaneously until the locking action is completed.

[0012] Advantages: Compared with the prior art, the technical solution of the present invention has the following advantages: The direct cooperation between the lead screw and the non-metallic nut reduces the requirements for the material and hardness of the lead screw, enables lubrication-free operation throughout the life cycle, improves the machining efficiency of parts, reduces the material cost of parts and the subsequent maintenance cost; when in the locked state, the locking pin is limited by the locking pin limit stopper, the nut slider is limited by the slider stopper, and the axial movement of the nut is completely restricted, realizing passive locking, and the locking reliability and safety are relatively high. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present invention;

[0014] Figure 2 is a schematic structural diagram of the first nut assembly;

[0015] Figure 3 is a schematic structural diagram of the slider guide rail;

[0016] Figure 4 is a schematic diagram of the locked state;

[0017] Figure 5 is a schematic diagram of the unlocked state;

[0018] Figure 6 is a schematic diagram of the double-locking structure. Detailed Embodiments

[0019] The technical solution of the present invention will be introduced in detail below in combination with the specific embodiments and the drawings in the specification.

[0020] As Figures 1-3 shown, the passive locking device of the present invention includes a locking pin limit block 1, a lead screw 2, a first nut assembly 3, a slider guide rail 4, a driving device 5, a slider block 6, a rolling pin 8, a slider 9, a nut sleeve 10, and a nut 11. The specific installation method is as follows: The slider guide rail 4 is arranged on the bottom plate, the lead screw 2 is installed outside the slider guide rail 4, and the driving device 5 is installed at the end of the lead screw 2; in this solution, both the lead screw 2 and the driving device 5 are fixedly installed on the bottom plate through mounting seats. The slider guide rail 4 can be set separately or integrated into devices such as the mounting bottom plate to realize the radial rotation limit function of the nut. A locking pin limit block 1 is arranged on the bottom plate above the slider guide rail 4. In order to increase the contact area between the locking pin limit block 1 and the rolling pin 8, and thus improve the locking effect, a stepped structure is arranged on the locking pin limit block 1, and the plane of the locking pin limit block 1 used to contact the rolling pin 8 is set as an inclined plane.

[0021] A first nut assembly 3 is sleeved on the lead screw 2. The first nut assembly 3 includes a rolling pin 8, a slider 9, a nut sleeve 10, a nut 11, and a nut seat 12. The nut 11 is a non-metallic material nut. The inner wall of the nut 11 is matched with the lead screw 2. The nut 11 has the same thread profile as the lead screw 2. A nut sleeve 10 is fixedly sleeved on the outer wall of the nut 11; one end of the nut sleeve 10 is installed with the slider 9, and the other end is installed with the rolling pin 8. The slider 9 is matched with the slider guide rail 4 to drive the first nut assembly 3 to move along the slider guide rail 4; the rolling pin 8 is matched with the locking pin limit block 1 to realize locking. The nut seat 12 is a metal material nut seat. The nut seat 12 is sleeved on the lead screw 2. The nut seat 12 is matched with the nut sleeve 10 and rotates radially. The nut seat 12 is connected to the door panel. A torsion spring 13 is installed between the nut seat 12 and the nut sleeve 10 to realize the rotation angle limit and energy storage.

[0022] The slider block 6 is installed in the locking section. The slider guide rail 4 is provided with an opening 41 in the locking section. When the slider 9 moves to the locking section, the slider 9 exits from the opening 41 of the slider guide rail 4. At this time, the rolling pin 8 on the first nut assembly 3 falls into the inner side of the locking pin limit block 1. After the slider 9 exits from the slider guide rail 4, it is blocked by the slider block 6 to realize the locking limit. In order to better realize the limiting function of the slider block 6 on the slider 9, the slider block 6 adopts a bending structure. The upper half of the slider block 6 is fixed inside the slider guide rail 4, and its lower half is suspended. When the slider 9 exits from the slider guide rail 4, it is just blocked by the suspended part of the slider block 6.

[0023] Working principle of the non-locking section: Since the slider 9 on the first nut assembly 3 is located inside the slider guide rail 4, the radial rotation of the first nut assembly 3 is restricted by the slider guide rail 4 and cannot rotate. At this time, when the lead screw 2 is rotated, the first nut assembly 3 can only move axially back and forth to realize the driving of opening and closing the door.

[0024] As Figure 4 shown, the locking principle is as follows: At a position close to the locking section, an opening 41 is provided on the locking side of the slider guide rail 4. When the locking action is performed, when the slider 9 moves to the opening of the slider guide rail 4, the radial limit of the slider 9 disappears. Under the dual action of the torsion spring 13 and the rotation of the lead screw 2, the nut 11 rotates radially to perform the locking action. At this time, the slider 9 will exit from the opening of the slider guide rail 4, and the rolling pin 8 synchronously drops to the inside of the locking pin limit block 1. The axial limit and radial limit in the unlocking direction of the nut are realized through the rolling pin 8 and the locking pin limit block 1. At the same time, after the slider 9 on the first nut assembly 3 exits the slider guide rail 4, it is limited in the closing direction by the slider block 6. At this time, the first nut assembly 3 cannot move axially left and right, realizing the locking function.

[0025] As Figure 5 shown, the unlocking principle is as follows: In the locked state, the driving device 5 drives the lead screw 2 to rotate reversely. At this time, because the first nut assembly 3 is axially limited and cannot move axially, it starts to rotate radially. When the first nut assembly 3 rotates a certain angle, the slider 9 enters the slider guide rail 4, and the first nut assembly 3 is radially limited and cannot continue to rotate. At the same time, the rolling pin 8 has exited the locking pin limit block 1, and the axial limit in the unlocking direction of the nut disappears. At this time, the lead screw 2 continues to rotate, and the nut 11 starts to move axially to complete the unlocking action.

[0026] As Figure 6 shown, this solution also includes a double-locking structure, which includes two passive locking devices for the rail vehicle door system. The driving device 5 drives the two passive locking devices at the same time. Two sections of threads are arranged in the reverse direction on the lead screw 2. When the lead screw 2 rotates, the two nut assemblies move towards the middle of the lead screw 2 at the same time until the locking action is completed.

Claims

1. A passive locking device for an orbital vehicle door system, characterized in that: It includes a slider guide rail (4) arranged on the bottom plate, a lead screw (2) is installed outside the slider guide rail (4), and a driving device (5) is installed at the end of the lead screw (2); A first nut assembly (3) is sleeved on the lead screw (2). The first nut assembly (3) includes a rolling pin (8), a slider (9), a nut sleeve (10) and a nut (11). Among them, the nut (11) is a non-metallic material nut; the inner wall of the nut (11) is matched with the lead screw (2), and the outer wall of the nut (11) is fixedly sleeved with the nut sleeve (10); one end of the nut sleeve (10) is installed with the slider (9), and the other end is installed with the rolling pin (8). The slider (9) is matched with the slider guide rail (4) to drive the first nut assembly (3) to move along the slider guide rail (4); a locking pin limit stop (1) is arranged on the bottom plate above the slider guide rail (4) for cooperating with the rolling pin (8) to achieve locking; It further includes a slider stop block (6) installed in the locking section. The slider guide rail (4) is provided with an opening (41) in the locking section. When the slider (9) moves to the locking section, the slider (9) exits from the opening (41) of the slider guide rail (4), and the rolling pin (8) falls into the inner side of the locking pin limit stop (1) to achieve locking; after the slider (9) exits from the slider guide rail (4), it is blocked by the slider stop block (6) to achieve locking limit.

2. The passive locking device for a rail vehicle door system according to claim 1, characterized in that: The locking pin limit stop (1) is provided with a stepped structure, and the plane of the locking pin limit stop (1) used to contact the rolling pin (8) is set as an inclined plane.

3. The passive locking device for the door system of a rail vehicle according to claim 1, characterized in that: The slider stop block (6) adopts a bent structure. The upper half of the slider stop block (6) is fixed inside the slider guide rail (4), and its lower half is suspended. After the slider (9) exits from the slider guide rail (4), it is blocked by the suspended part of the slider stop block (6).

4. The passive locking device for a rail vehicle door system according to claim 1, characterized in that: The first nut assembly (3) further includes a nut seat (12). The nut seat (12) is a metal material nut seat. The nut seat (12) is sleeved on the lead screw (2), the nut seat (12) is matched with the nut sleeve (10) and rotates radially, and the nut seat (12) is connected to the door panel.

5. The passive locking device for a rail vehicle door system according to claim 4, characterized in that: A torsion spring (13) is installed between the nut seat (12) and the nut sleeve (10).

6. The passive locking device for an orbital vehicle door system according to any one of claims 1 to 5, characterized in that: Both the lead screw (2) and the driving device (5) are fixedly installed on the bottom plate through mounting seats.

7. A double-locking structure, characterized in that: This locking structure includes two sets of passive locking devices for the rail vehicle door system as described in claim 1. The driving device (5) drives the two sets of passive locking devices simultaneously. Two sections of threads are arranged in reverse on the lead screw (2). When the lead screw (2) rotates, the two nut assemblies move towards the middle of the lead screw (2) simultaneously until the locking action is completed.

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