A safety speed limiting device for a transport vehicle for subway equipment

Abstract

The present invention discloses a safety speed limiting device for a transport vehicle for subway equipment, which relates to the technical field of safety devices. The device comprises a vehicle body and a power shaft, wherein a speed reduction mechanism and a support mechanism are sleeved on the power shaft; the speed reduction mechanism comprises a fixed sleeve and a protective shell, wherein the fixed sleeve is fixed on the power shaft and an outer support body is embedded in its circumference, a brake body is elastically embedded in the inner wall of the protective shell, and the side of the brake body facing the outer support body is provided as a fitting surface; the support mechanism comprises a positioning platform, which is mounted on the vehicle body, an adjustment platform is movably provided at the bottom of the positioning platform, and the protective shell is fixed on the adjustment platform. In the present invention, the special shape of the fitting surface allows different functions to be realized between the fitting surface and the outer support body during the fitting process, thereby distinguishing whether the vehicle is moving forward or backward. The brake body can limit the rotation speed of the power shaft, thereby playing a safety protection role.

Description

Technical Field

[0001] The present invention relates to the technical field of safety devices, and in particular to a safety speed limiting device for a transport vehicle for subway equipment. Background Art

[0002] The subway is a form of rail transportation, referring to an urban rail transit system that primarily operates underground. It's also known as "subway" or "metro" for short. Excavating underground space can save ground space, allowing the land to be used for other purposes. Since subway routes don't overlap or intersect with other transportation systems, they experience less traffic interference, making them a more suitable transportation system for large cities. During subway construction, rail transport vehicles are needed to transport construction materials and equipment. These vehicles typically travel directly on subway tracks, saving space and making it easier to transport construction materials.

[0003] A Chinese patent with the patent announcement number CN217532838U proposes a rail transport vehicle for installation and construction between subway stations, including a main frame, wheels and handrails. The handrails are connected to the rear of the main frame, and the wheels are connected to the four corners of the main frame. A braking structure is provided on the two wheels located at the rear of the main frame, and a brake operating mechanism is provided on the handrail. The brake operating mechanism is transmission-connected to the brake mechanism.

[0004] Metro construction requires the use of rail transport vehicles. While simple and practical, their simple structure can lead to unstable power control systems, and the metro equipment they transport is inherently dangerous. Considering the narrow, long, dark environment of metro construction, which makes it difficult to balance the front and rear, rail transport vehicles are prone to danger when transporting metro equipment, so the transport speed of rail transport vehicles needs to be paid special attention to. Summary of the Invention

[0005] The purpose of the present invention is to provide a safety speed limiting device for a transport vehicle for subway equipment, which has the advantages of stable deceleration, distinction between forward and reverse movement, and easy installation.

[0006] The present invention is achieved through the following technical solutions:

[0007] A safety speed limiting device for a transport vehicle for subway equipment comprises a vehicle body and a power shaft placed therein for achieving power output, wherein a reduction mechanism and a support mechanism are sleeved on the power shaft; the reduction mechanism comprises a fixed sleeve and a protective shell, wherein the fixed sleeve is fixed on the power shaft and at least four outer support bodies are embedded on its circumference, at least three brake bodies are elastically embedded on the inner wall of the protective shell, and the side of the brake body facing the outer support body is provided with a fitting surface, and the distance between the fitting surface and the power shaft changes linearly; the support mechanism comprises a positioning platform, wherein the positioning platform is mounted on the vehicle body, an adjustment platform is movably provided at the bottom of the positioning platform, and the protective shell is fixed on the adjustment platform.

[0008] It is further configured as follows: the outer support bodies are formed in a ring shape and the outer support bodies are connected by elastic rings.

[0009] It is further configured as follows: the inner wall of the protective shell is provided with a plurality of bases corresponding to the braking body, and both ends of the base are provided with outer edges to limit the moving direction of the corresponding braking body.

[0010] It is further configured as follows: a support spring is embedded in the base, and the other end of the support spring extends into the brake body and is perpendicular to the fitting surface.

[0011] It is further configured that: the surface of the bonding surface is coated with a heat insulation layer.

[0012] It is further configured as follows: screws are rotatably provided at both ends of the positioning platform, the two screws pass through the adjustment platform respectively, the adjustment platform and the positioning platform are parallel to each other, and a worm is also rotatably provided in the positioning platform for driving the two screws to rotate synchronously, one end of the worm extends to the outside of the positioning platform and a handle is fixed to the end.

[0013] It is further configured as follows: two positioning columns are provided on the top of the protective shell, and the positioning columns can be inserted into the adjustment platform.

[0014] It is further configured that: locking pins are elastically provided at both ends of the interior of the adjustment platform, and the locking pins can be stuck in the notches corresponding to the positioning columns.

[0015] It is further configured as follows: a return spring is provided inside the adjustment platform, and the return spring is used to support the locking pin.

[0016] It is further configured that: both ends of the positioning platform are provided with wing edges, and a plurality of fixing nuts pass through the wing edges to achieve fixation with the vehicle body.

[0017] In summary, the beneficial technical effects of the present invention are:

[0018] (1) When the vehicle is moving forward, the safety speed limiter can gradually apply resistance to the power shaft so as to achieve control before the power shaft completely exceeds the safety speed limit. The deceleration process is smooth and reduces the sense of frustration of the vehicle. When the vehicle is moving backward, the safety speed limiter can quickly apply resistance to the power shaft so as to achieve control before the power shaft completely exceeds the safety speed limit. The deceleration process has a significant sense of frustration, thus reminding passengers that the vehicle is moving backward.

[0019] (2) The brake body can limit the rotation speed of the power shaft, thereby playing a safety protection role and preventing the vehicle from speeding too fast. The brake body can also realize different functions of the two during the process of fitting with the outer support body through the special shape of the fitting surface, making it easier for passengers to distinguish whether the vehicle is moving forward or backward;

[0020] (3) The fixed sleeve is fixed by the positioning table and the height is adjusted by the adjusting table, thereby ensuring that the power shaft can pass through the center of multiple brake bodies in the fixed sleeve to ensure the stability of the brake;

[0021] (4) The reduction mechanism and support mechanism are both independent and detachable modules, which are convenient for installation, maintenance and overhaul. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the installation position of the present invention;

[0023] Figure 2 is a cross-sectional view of the present invention;

[0024] Figure 3 yes Figure 2 A partial enlarged view of part A in the middle.

[0025] Figure numerals: 1. Vehicle body; 2. Power shaft; 3. Fixing sleeve; 4. Protective shell; 5. Outer support body; 6. Braking body; 7. Fitting surface; 8. Positioning platform; 9. Adjusting platform; 10. Elastic ring; 11. Base; 12. Support spring; 13. Screw; 14. Worm; 15. Handle; 16. Positioning column; 17. Locking pin; 18. Return spring; 19. Wing edge. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0027] Reference Figure 1 , which is a safety speed limiting device for a subway equipment transport vehicle disclosed in the present invention, includes a vehicle body 1 and a power shaft 2 placed therein to achieve power output, wheels are fixed at both ends of the power shaft 2, and an engine is installed in the vehicle body 1 to drive the power shaft 2 to rotate.

[0028] A speed reduction mechanism for achieving safe speed limit for the power shaft 2 is installed at the end of the power shaft 2 , and a support mechanism for fixing the speed reduction mechanism is installed at the bottom of the vehicle body 1 .

[0029] Reference Figure 2 and Figure 3 The reduction mechanism includes a fixed sleeve 3, which is fixed to the power shaft 2. The fixed sleeve 3 and the power shaft 2 are fixed with a flat key. The peripheral side of the fixed sleeve 3 is a concave structure, and at least four outer supports 5 are embedded in the concave structure. The multiple outer supports 5 form a ring shape and are connected by elastic rings 10. The elastic rings 10 press the outer supports 5 against the peripheral side of the fixed sleeve 3 to prevent them from falling off. When the fixed sleeve 3 rotates at high speed following the power shaft 2, the outer supports 5 will gradually detach from the outer periphery of the fixed sleeve 3 due to centrifugal force. The elastic rings 10 can not only limit the detachment position of the outer supports 5, but also ensure that the detachment distances between the multiple outer supports 5 are equal.

[0030] The reduction mechanism also includes a protective shell 4, which has a cavity within it and a fixed sleeve 3 positioned within it. At least three brake bodies 6 are elastically embedded in the inner wall of the protective shell 4, with the number of brake bodies 6 being one less than the number of outer support bodies 5. A plurality of bases 11 corresponding to the brake bodies 6 are fixed to the inner wall of the protective shell 4. Both ends of the bases 11 are provided with outer edges to limit the movement direction of the corresponding brake bodies 6, which are radially relative to the power shaft 2. The plurality of brake bodies 6 are arranged in a ring, and the side of the brake body 6 facing the outer support body 5 is provided with a contact surface 7. A support spring 12 is embedded in the base 11, and the other end of the support spring 12 extends into the brake body 6 and is perpendicular to the contact surface 7. The contact surface 7 is a curved surface, and the distance between the contact surface 7 and the power shaft 2 varies linearly. For example, the contact surface 7 consists of three parts: a large-radius concave surface (concave inward relative to the brake body 6), a small-radius convex surface (convex outward relative to the brake body 6), and a midpoint. Both the concave and convex surfaces vary linearly, with the midpoint having the shortest straight-line distance from the axis of the power shaft 2. The contact surface 7 is coated with a thermal insulation layer.

[0031] When the power shaft 2 rotates clockwise, that is, when the vehicle body 1 moves forward, the speed of the power shaft 2 gradually exceeds the safety speed limit, the outer support body 5 leaves the fixed sleeve 3 under the action of centrifugal force and contacts the brake body 6. The outer support body 5 first contacts the large-arc concave surface of the fitting surface 7, thereby realizing contact friction. Due to the shape of the brake body 6, the friction force gradually increases, and the power shaft 2 gradually decelerates. When full contact is achieved, it plays a role of safety speed limit.

[0032] When the power shaft 2 rotates counterclockwise, that is, when the vehicle body 1 moves backward, the speed of the power shaft 2 gradually exceeds the safety speed limit, the outer support body 5 leaves the fixed sleeve 3 under the action of centrifugal force and contacts the brake body 6. The outer support body 5 first contacts the small arc convex surface of the fitting surface 7, thereby realizing contact friction. Due to the shape of the brake body 6, the friction force will directly increase, and the power shaft 2 will quickly decelerate. When full contact is achieved, it plays a role of safety speed limit.

[0033] Reference Figure 2 The supporting mechanism includes a positioning platform 8, which is installed on the vehicle body 1. Both ends of the positioning platform 8 are provided with wing edges 19, and a plurality of fixing nuts are passed through the wing edges 19 to achieve fixation with the vehicle body 1.

[0034] An adjustment platform 9 is movably provided at the bottom of the positioning platform 8. The adjustment platform 9 and the positioning platform 8 are arranged parallel to each other. Screws 13 are rotatably provided at both ends of the positioning platform 8. The two screws 13 are perpendicular to the surface of the positioning platform 8 and pass through the adjustment platform 9. A worm 14 is also rotatably provided inside the positioning platform 8 to drive the two screws 13 to rotate synchronously. A turbine is fixed to the end of the screw 13 located inside the positioning platform 8 to engage with the worm 14. One end of the worm 14 extends to the outside of the positioning platform 8 and is fixed to a handle 15. By rotating the handle 15, the two screws 13 can be driven to rotate synchronously, thereby realizing the lifting and lowering of the adjustment platform 9.

[0035] Two positioning posts 16 are fixed to the top of the protective shell 4. Both posts 16 can be inserted into the adjustment platform 9. The ends of the posts 16 are provided with triangular notches. Inside the adjustment platform 9, a return spring 18 and a locking pin 17 are installed. The return spring 18 supports the locking pin 17, which snaps into the notch of the corresponding positioning post 16. The position of the locking pin 17 corresponds one-to-one with the position of the positioning post 16. The cooperation between the positioning posts 16 and the locking pin 17 ensures the securement of the protective shell 4.

[0036] The working principle of the present invention is:

[0037] In the present invention, the deceleration mechanism and the support mechanism are both independent detachable modules. First, the fixing sleeve 3 is installed on the power shaft 2 to achieve fixation, and then the protective shell 4 and the internal brake body 6 are installed. The fixing position of the fixing platform and the distance between the adjustment platform 9 and the fixing platform are adjusted according to the position of the protective shell 4, so that the adjustment platform 9 can effectively fix the protective shell 4 at the center position where the power shaft 2 can pass through it.

[0038] When the power shaft 2 rotates clockwise, that is, when the vehicle body 1 moves forward, the speed of the power shaft 2 gradually increases and is about to exceed the safety speed limit, the outer support body 5 will leave the fixed sleeve 3 and contact the brake body 6 under the action of centrifugal force. Due to the shape of the fitting surface 7 of the brake body 6, the friction between the outer support body 5 and the brake body 6 will gradually increase. At this time, the brake body 6 has formed a speed obstacle to the outer support body 5, and the resistance is gradually increasing until it exceeds the speed. When the speed exceeds the safety speed limit, the brake body 6 will be in full contact with the outer support body 5, thereby playing a role in safety speed limiting.

[0039] When the power shaft 2 rotates counterclockwise, that is, when the vehicle body 1 moves backward, the speed of the power shaft 2 gradually increases and is about to exceed the safety speed limit, the outer support body 5 will leave the fixed sleeve 3 and contact the brake body 6 under the action of centrifugal force. Due to the shape of the contact surface 7 of the brake body 6, the friction between the outer support body 5 and the brake body 6 will suddenly increase. At this time, the brake body 6 has formed a speed limit for the outer support body 5, and the resistance increases directly until it exceeds the speed. When the speed exceeds the safety speed limit, the brake body 6 will be in full contact with the outer support body 5, thereby playing a role in safety speed limiting.

[0040] This approach allows the safety speed limiter to gradually apply resistance to the power shaft 2 when the vehicle 1 is moving forward, thereby achieving control before the power shaft 2 completely exceeds the safety speed limit. This deceleration process is smooth and reduces the sense of vehicle jerkiness. When the vehicle 1 is moving backward, the safety speed limiter can rapidly apply resistance to the power shaft 2, thereby achieving control before the power shaft 2 completely exceeds the safety speed limit. This deceleration process is jerk-like, reminding passengers that the vehicle is moving backward.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A safety speed limiting device for a subway equipment transport vehicle, characterized by: It comprises a vehicle body (1) and a power shaft (2) disposed therein for achieving power output, wherein a speed reduction mechanism and a support mechanism are sleeved on the power shaft (2); The deceleration mechanism comprises a fixed sleeve (3) and a protective shell (4), wherein the fixed sleeve (3) is fixed on the power shaft (2) and at least four outer support bodies (5) are embedded in the circumference thereof, and at least three braking bodies (6) are elastically embedded in the inner wall of the protective shell (4), and the side of the braking body (6) facing the outer support body (5) is set as a fitting surface (7), and the distance between the fitting surface (7) and the power shaft (2) changes linearly; the support mechanism comprises a positioning platform (8), wherein the positioning platform (8) is mounted on the vehicle body (1), and an adjustment platform (9) is movably provided at the bottom of the positioning platform (8), and the protective shell (4) is fixed on the adjustment platform (9); The fitting surface (7) is composed of three parts, including a large-radius concave surface, a small-radius convex surface and a middle point; The outer support bodies (5) are formed in a ring shape and the outer support bodies (5) are connected via elastic rings (10).

2. A safety speed limiting device for a subway equipment transport vehicle according to claim 1, characterized in that: The inner wall of the protective shell (4) is provided with a plurality of bases (11) corresponding to the braking body (6), and both ends of the bases (11) are provided with outer edges to limit the movement direction of the corresponding braking body (6).

3. A safety speed limiting device for a subway equipment transport vehicle according to claim 2, characterized in that: A support spring (12) is embedded in the base (11), and the other end of the support spring (12) extends into the brake body (6) and is perpendicular to the fitting surface (7).

4. A safety speed limiting device for a subway equipment transport vehicle according to any one of claims 1 to 3, characterized in that: The surface of the bonding surface (7) is coated with a heat insulation layer.

5. The safety speed limiting device for a subway equipment transport vehicle according to claim 1, characterized in that: Screws (13) are rotatably provided at both ends of the positioning platform (8), and the two screws (13) pass through the adjustment platform (9) respectively. The adjustment platform (9) and the positioning platform (8) are parallel to each other. A worm (14) is rotatably provided in the positioning platform (8) for driving the two screw rods (13) to rotate synchronously. One end of the worm (14) extends to the outside of the positioning platform (8) and a handle (15) is fixed to the end.

6. The safety speed limiting device for a subway equipment transport vehicle according to claim 1, characterized in that: Two positioning columns (16) are provided at the top end of the protective shell (4), and the positioning columns (16) can be inserted into the adjustment platform (9).

7. A safety speed limiting device for a subway equipment transport vehicle according to claim 6, characterized in that: Lock pins (17) are elastically provided at both ends of the interior of the adjustment platform (9), and the lock pins (17) can be stuck in the notches corresponding to the positioning columns (16).

8. The safety speed limiting device for a subway equipment transport vehicle according to claim 7, characterized in that: A return spring (18) is provided inside the adjustment platform (9), and the return spring (18) is used to support the locking pin (17).

9. The safety speed limiting device for a subway equipment transport vehicle according to claim 1, characterized in that: Both ends of the positioning platform (8) are provided with wing edges (19), and a plurality of fixing nuts are passed through the wing edges (19) to achieve fixation with the vehicle body (1).

Images