Auxiliary reversing device for vehicle in narrow space

Abstract

The utility model discloses a narrow space vehicle auxiliary reversing device which comprises a rotary table (1), a chassis (2) arranged below the rotary table (1), a thrust bearing (3) arranged between the rotary table (1) and the chassis (2), a gear motor (4) arranged at the bottom of the chassis (2), a driving shaft (5) upwards penetrating through the chassis (2) arranged at the output end of the gear motor (4), and an upper friction ring (6) arranged at the bottom of the rotary table (1). A lower friction ring (7) in sliding connection with the driving shaft (5) is arranged at the bottom of the upper friction ring (6); a pressure spring (8) is arranged between the lower friction ring (7) and the chassis (2); the driving shaft (5) is a square shaft, and a square hole (16) matched with the driving shaft (5) is formed in the lower friction ring (7). The utility model has the advantage that faults are not easy to occur.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel construction auxiliary equipment, and in particular relates to a vehicle auxiliary reversing device in a narrow space. Background Technology

[0002] Tunnel excavation is frequently required at water conservancy and hydropower construction sites. During tunnel excavation, trucks are needed to transport the excavated soil. Many tunnels are narrow, while trucks are long, making it difficult for them to turn around and change direction within the tunnel on their own. Therefore, construction teams often employ methods such as... Figure 5 The auxiliary reversing device shown is used to complete the reversing of the truck.

[0003] The existing auxiliary reversing device includes a turntable that is basically flush with the tunnel floor. The turntable is located in a cylindrical pit excavated in the tunnel floor. A chassis is located below the turntable and is fixed to the pit. A thrust bearing is installed between the turntable and the chassis. A rotating shaft is located at the bottom of the turntable, and a geared motor with its output end connected to the rotating shaft is located at the bottom of the chassis. When a truck drives onto the turntable, the geared motor drives the turntable to rotate 180°, thus reversing the direction of the truck.

[0004] During use, it was found that some drivers have a rather aggressive driving style. Instead of slowly driving the truck to a stop on the turntable, they arrive at the turntable at a relatively high speed and then brake suddenly. The trucks are heavy, especially when fully loaded with earth, weighing tens of tons. When braking suddenly, a huge inertia is generated on the turntable, creating a huge torque. This torque is overcome by the self-locking force of the gearbox on the geared motor, which can easily lead to gearbox failure or even the casing cracking. Replacing the gearbox takes a long time, putting pressure on the timely completion of the project. Utility Model Content

[0005] The purpose of this invention is to provide an auxiliary reversing device for vehicles in narrow spaces.

[0006] This invention has the advantage of being less prone to failure.

[0007] The technical solution of this utility model is as follows: A vehicle auxiliary reversing device in a narrow space includes a turntable, a chassis is provided below the turntable, a thrust bearing is provided between the turntable and the chassis, a reduction motor is provided at the bottom of the chassis, a drive shaft is provided at the output end of the reduction motor and passes through the chassis upward, an upper friction ring is provided at the bottom of the turntable, a lower friction ring is provided at the bottom of the upper friction ring and slidably connected to the drive shaft, and a compression spring is provided between the lower friction ring and the chassis.

[0008] In the aforementioned narrow space vehicle auxiliary reversing device, the drive shaft is a square shaft, and the lower friction ring is provided with a square hole that mates with the drive shaft.

[0009] In the aforementioned narrow-space vehicle auxiliary steering device, the compression spring is helical, and there are two compression springs, which are coaxially arranged.

[0010] In the aforementioned narrow space vehicle auxiliary reversing device, the bottom surface of the upper friction ring is provided with a plurality of upper teeth arranged in a ring, and the top surface of the lower friction ring is provided with a plurality of lower teeth arranged in a ring. The lower teeth mate with each other, and the cross-sections of the upper teeth and the lower teeth are both triangular.

[0011] In the aforementioned narrow space vehicle auxiliary reversing device, the chassis is provided with an electromagnet connected in parallel with a reduction motor. The upper side of the electromagnet is provided with a friction disc that contacts the turntable. The outer side of the electromagnet is provided with a ring plate fixed to the chassis. The ring plate is provided with a guide post that is slidably connected to the friction disc. The guide post is provided with a spiral spring, which is located between the friction disc and the ring plate.

[0012] In the aforementioned narrow-space vehicle auxiliary reversing device, there are multiple electromagnets, which are evenly distributed around the axis of the turntable.

[0013] In the aforementioned narrow-space vehicle auxiliary reversing device, the electromagnet is located near the outer peripheral surface of the turntable.

[0014] Compared with existing technologies, this invention, based on existing auxiliary reversing devices, sets an upper friction ring at the bottom of the turntable and a lower friction ring at the output end of the geared motor. A compression spring establishes a frictional connection between the upper and lower friction rings. The geared motor drives the turntable to rotate via these rings, completing the truck reversal. When the truck brakes suddenly on the turntable and generates significant inertia, the upper and lower friction rings slip, cutting off the torque transmission path and protecting the gearbox of the geared motor from excessive torque, thus preventing gearbox failure and ensuring timely project completion. Therefore, this invention has the advantage of being less prone to failure.

[0015] In addition, by setting an electromagnet connected in parallel with the geared motor, the electromagnet does not generate magnetic force when the turntable is not rotating, thus establishing a stable frictional connection between the turntable and the friction plate, further increasing the rotational resistance of the turntable, ensuring that the turntable will not be rotated when the truck passes over it, thus ensuring the safety of the truck. When the turntable is rotating, the magnetic force generated by the electromagnet separates the turntable from the friction plate, ensuring that the turntable rotates smoothly with low rotational energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 yes Figure 1 Enlarged view at point A.

[0018] Figure 3 This is a bottom view of the upper friction ring.

[0019] Figure 4 This is a top view of the lower friction ring.

[0020] Figure 5 This is a schematic diagram of the existing commutation device.

[0021] The markings in the attached diagram are as follows: 1-turntable, 2-chassis, 3-thrust bearing, 4-gear motor, 5-drive shaft, 6-upper friction ring, 7-lower friction ring, 8-compression spring, 9-upper tooth, 10-lower tooth, 11-electromagnet, 12-friction disc, 13-ring plate, 14-guide post, 15-spring, 16-square hole. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0023] Example. A vehicle auxiliary steering device in a confined space, such as... Figure 1 As shown, it includes a steel turntable 1, with a base 2 below the turntable 1. Both the turntable 1 and the base 2 are made of steel plates with sufficient structural strength. Three thrust bearings 3 are provided between the turntable 1 and the base 2, and the three thrust bearings 3 are coaxially arranged. The turntable 1 is rotatably connected to the base 2 through the thrust bearings 3. A geared motor 4 is provided at the bottom of the base 2. Its features are as follows:

[0024] The output end of the geared motor 4 is provided with a drive shaft 5 that passes upward through the chassis 2. The drive shaft 5 is a square shaft. The lower friction ring 7 is provided with a square hole 16 that mates with the drive shaft 5. The lower friction ring 7 is slidably connected to the drive shaft 5. The bottom of the turntable 1 is provided with an upper friction ring 6. The bottom of the upper friction ring 6 is provided with a lower friction ring 7 that is slidably connected to the drive shaft 5. Two helical compression springs 8 are provided between the lower friction ring 7 and the chassis 2. The two compression springs 8 are coaxially arranged.

[0025] The upper friction ring 6 has multiple upper teeth 9 arranged in a ring on its bottom surface, and the lower friction ring 7 has multiple lower teeth 10 arranged in a ring on its top surface. The lower teeth 10 engage with each other, and the cross-sections of both the upper teeth 9 and the lower teeth 10 are triangular. The engagement of the upper and lower teeth increases the frictional force between the upper and lower friction rings.

[0026] The chassis 2 is equipped with multiple electromagnets 11, each connected in parallel with the reduction motor 4. The multiple electromagnets 11 are evenly distributed around the axis of the turntable 1. The electromagnets 11 are close to the outer circumference of the turntable 1. A friction disc 12 is provided on the upper side of the electromagnet 11, which is in close contact with the turntable 1. An annular plate 13 fixed to the chassis 2 is provided on the outer side of the electromagnet 11. Three guide posts 14 are provided on the annular plate 13, each of which is slidably connected to the friction disc 12. A spiral spring 15 is provided on the guide post 14, and the spring 15 is located between the friction disc 12 and the annular plate 13.

[0027] Working principle: When the geared motor 4 is not energized, the electromagnet 11 is also not energized. Under the action of the spring 15, the friction disc 12 is pressed against the turntable 1, giving the turntable 1 great resistance when it rotates circumferentially. When the truck's inertia acts on the turntable 1 or passes over it, the friction disc 12 provides torque to prevent the turntable 1 from rotating. When the truck's inertia increases and the friction disc 12 can no longer prevent the turntable 1 from rotating, the gearbox of the geared motor 4 provides a self-locking force, which is transmitted to the turntable 1 through the drive shaft 5, lower friction ring 7, and upper friction ring 6, preventing the turntable 1 from rotating. Before the truck's inertia continues to increase and the inertia it brings to the turntable 1 will damage the gearbox, the torque transmitted between the upper and lower friction rings reaches its upper limit. The upper and lower friction rings disengage, cutting off the rigid torque transmission path, allowing the turntable 1 to rotate. During rotation, the inertia is counteracted, protecting the gearbox. After the truck stops on the turntable 1, the reduction motor 4 is started, and the electromagnet 11 is energized accordingly. The electromagnet 11 attracts the friction disc 12 to overcome the elastic force of the spring 15 and descend, causing the friction disc 12 to separate from the turntable 1. The reduction motor 4 causes the drive shaft 5 to rotate, and the drive shaft 5 causes the turntable 1 to rotate about 180° through the lower friction ring 7 and the upper friction ring 6, thus completing the truck reversal.

Claims

1. A vehicle steering assist device for narrow spaces, comprising a turntable (1), a chassis (2) below the turntable (1), a thrust bearing (3) between the turntable (1) and the chassis (2), and a reduction motor (4) at the bottom of the chassis (2), characterized in that: The output end of the geared motor (4) is provided with a drive shaft (5) that passes upward through the chassis (2). The bottom of the turntable (1) is provided with an upper friction ring (6). The bottom of the upper friction ring (6) is provided with a lower friction ring (7) that is slidably connected to the drive shaft (5). A compression spring (8) is provided between the lower friction ring (7) and the chassis (2).

2. The vehicle auxiliary reversing device in a narrow space according to claim 1, characterized in that: The drive shaft (5) is a square shaft, and the lower friction ring (7) is provided with a square hole (16) that mates with the drive shaft (5).

3. The vehicle auxiliary reversing device in a narrow space according to claim 1, characterized in that: The compression spring (8) is helical, and there are two compression springs (8) arranged coaxially.

4. The vehicle auxiliary reversing device in a narrow space according to claim 1, characterized in that: The bottom surface of the upper friction ring (6) is provided with a plurality of upper teeth (9) arranged in a ring, and the top surface of the lower friction ring (7) is provided with a plurality of lower teeth (10) arranged in a ring. The lower teeth (10) cooperate with each other, and the cross-sections of the upper teeth (9) and the lower teeth (10) are both triangular.

5. The vehicle auxiliary reversing device in a narrow space according to claim 1, characterized in that: The chassis (2) is provided with an electromagnet (11) connected in parallel with the geared motor (4). The upper side of the electromagnet (11) is provided with a friction disc (12) that contacts the turntable (1). The outer side of the electromagnet (11) is provided with a ring plate (13) fixed to the chassis (2). The ring plate (13) is provided with a guide post (14) that is slidably connected to the friction disc (12). The guide post (14) is provided with a spiral spring (15), which is located between the friction disc (12) and the ring plate (13).

6. The vehicle auxiliary reversing device in a narrow space according to claim 5, characterized in that: There are multiple electromagnets (11), and the multiple electromagnets (11) are evenly distributed around the axis of the turntable (1).

7. The vehicle auxiliary reversing device in a narrow space according to claim 5 or 6, characterized in that: The electromagnet (11) is located near the outer circumference of the turntable (1).

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