OHT trolley walking structure stable in cornering

Abstract

The utility model relates to an OHT trolley walking structure of overbending stability, including frame, walking wheel and track, the both ends of frame are provided with former pivot and rear pivot respectively, walking wheel is installed respectively in the both ends of former pivot and rear pivot, the outside of walking wheel is provided with the auxiliary wheel of same coaxial of walking wheel, and the auxiliary wheel and walking wheel are fixedly connected, track can cooperate with walking wheel, and the bender of track is provided with the mat strip of can cooperate with auxiliary wheel. The utility model discloses through walking wheel and auxiliary wheel, match the mat strip on the bender, make OHT trolley when running straight -line operation and turning operation separate, when OHT turns, auxiliary wheel and mat strip contact stress, and OHT is warped to one side, at this moment, auxiliary wheel and mat strip contact cooperation, walking wheel and track are separated contact, and rely on one side's auxiliary wheel to pass the bend, and the influence that the differential problem of former and rear wheel can be reduced greatly through this overbending mode, and the clearance of auxiliary wheel and mat strip can be adjusted through adjusting the number of gasket, and debugging is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of logistics equipment technology, and in particular relates to a stable OHT trolley walking structure for cornering. Background Technology

[0002] Air transport vehicles (OHTs) are widely used in semiconductor manufacturing plants for moving wafer cassettes; in the semiconductor manufacturing field, the process of moving wafer cassettes places very high demands on the stability of OHT operation.

[0003] like Figure 1 As shown, existing OHT (Outdoor Hierarchical Transport) systems typically employ a layout of two wheels on the front axle and two wheels on the rear axle, each driven by a motor. OHT tracks come in various types, but generally fall into two categories: straight tracks and curved tracks. When the OHT travels on a straight track, the front and rear axle motors rotate at the same speed, resulting in synchronization. However, when the OHT enters a curved track, a situation arises where the front axle has already entered the curved track while the rear axle remains on the straight track. Even with the front and rear axle motors rotating at the same speed, the front and rear wheels also rotate at the same speed, resulting in identical linear velocities. However, the front wheels rotate on the curved track while the rear wheels rotate on the straight track, leading to mutual drag between the front and rear wheels. This causes vehicle vibration, decreased positioning accuracy, and abnormal noises in the transmission system. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a stable OHT (Optical Trolley) walking structure for cornering.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A cornering-stabilized OHT (Optical Vehicle) travel structure includes:

[0007] The frame has a front axle and a rear axle at its two ends respectively;

[0008] The traveling wheels are respectively installed at both ends of the front axle and the rear axle; an auxiliary wheel coaxial with the traveling wheel is provided on the outer side of the traveling wheel, and the auxiliary wheel is fixedly connected to the traveling wheel;

[0009] The track is designed to cooperate with the traveling wheels, and the curved rails of the track are provided with pads that can cooperate with the auxiliary wheels.

[0010] Furthermore, the diameter of the auxiliary wheel is 0.6-0.8 times the diameter of the traveling wheel.

[0011] Furthermore, each end of the pad strip is provided with a connecting piece, the connecting piece is connected to the track by a connector, and a transition surface is provided between the connecting piece and the upper surface of the pad strip.

[0012] Furthermore, a shim is provided between the shim strip and the curved rail.

[0013] Furthermore, the front and rear axles are respectively provided with hinge shafts in their middle sections, and the front and rear axles are respectively mounted to the two sides of the frame using the hinge shafts.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] This invention utilizes a combination of large and small wheel structures for the traveling wheels and auxiliary wheels, along with shims on the curved track, to separate the straight-line and turning movements of the OHT trolley. When the OHT turns, the auxiliary wheel contacts the shims and is subjected to force, causing the OHT to tilt to one side. At this point, the auxiliary wheel engages with the shims, while the traveling wheels disengage from the track, allowing the trolley to navigate the curve using only one auxiliary wheel. This cornering method significantly reduces the impact of differential speed between the front and rear wheels. The gap between the auxiliary wheel and the shims can be adjusted by changing the number of shims, facilitating debugging. This invention features a simple structure, strong practicality, reasonable design, compact size, high standardization, and easy disassembly and maintenance, ensuring the stability of the device. Attached Figure Description

[0016] Figure 1 This is a layout diagram of a conventional OHT wheel in the prior art;

[0017] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the track section structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the front rotating shaft part of this utility model.

[0020] In the diagram: 1. Frame; 2. Front axle; 3. Rear axle; 4. Wheels; 5. Auxiliary wheels; 6. Rail; 7. Curved rail; 8. Connecting piece; 9. Connecting component; 10. Shim; 11. Hinge shaft; 12. Shim strip; 13. Transition surface. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] This embodiment proposes a cornering-stable OHT trolley walking structure, which includes a frame 1, wheels 4 and a track 6. The frame 1 provides installation space for the various components of the OHT trolley, and the track 6 is installed in the factory. The frame 1 can move on the track 6 through the cooperation of the wheels 4 and the track 6.

[0023] like Figures 2-4 As shown, the two ends of the frame 1 are respectively provided with a front pivot 2 and a rear pivot 3;

[0024] The traveling wheels 4 are respectively installed at both ends of the front rotating shaft 2 and the rear rotating shaft 3; an auxiliary wheel 5 coaxial with the traveling wheel 4 is provided on the outer side of the traveling wheel 4, and the auxiliary wheel 5 is fixedly connected to the traveling wheel 4.

[0025] The track 6 can cooperate with the traveling wheel 4, and the curved rail 7 of the track 6 is provided with a pad strip 12 that can cooperate with the auxiliary wheel 5;

[0026] When the OHT car travels in a straight line, it moves by relying on the cooperation between the traveling wheel 4 and the track 6. The speed of the front axle 2 and the rear axle 3 is consistent, and there is no contact between the auxiliary wheel 5 and the track 6. When turning, the auxiliary wheel 5 contacts the pad strip 12 on the curved track 7 to cooperate. At this time, the traveling wheel 4 is no longer in contact with the track 6, and the car passes through the curve by relying on the auxiliary wheel 5 on one side.

[0027] Furthermore, the diameter of the auxiliary wheel 5 is 0.6-0.8 times the diameter of the traveling wheel 4. The diameter of the auxiliary wheel 5 is smaller than the diameter of the traveling wheel 4 to avoid the auxiliary wheel 5 affecting the fit between the traveling wheel 4 and the track 6 when traveling in a straight line.

[0028] Furthermore, connecting pieces 8 are provided at both ends of the pad strip 12. The connecting pieces 8 are connected to the track 6 by connecting members 9. A transition surface 13 is provided between the connecting pieces 8 and the upper surface of the pad strip 12.

[0029] Furthermore, a shim 10 is provided between the shim strip 12 and the curved rail 7, and the gap between the auxiliary wheel 5 and the shim strip 12 can be adjusted by adjusting the number of shims 10.

[0030] Furthermore, the front pivot 2 and the rear pivot 3 are respectively provided with hinge shafts 11 in the middle part, and the front pivot 2 and the rear pivot 3 are respectively installed at both ends of the frame 1 using the hinge shafts 11.

[0031] Working principle: This utility model separates the straight-line movement and turning motion of the OHT trolley by using auxiliary wheels 5 and traveling wheels 4 with different diameters. The cooperation between the auxiliary wheels 5 and the pad strip 12 is used for turning, avoiding the influence of differential speed on the OHT's turning.

[0032] It is understood that the above embodiments are merely exemplary models used to illustrate the principles of this utility model, and this utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A cornering-stable OHT (Optical Handling Trolley) traveling structure, characterized in that, include: The frame (1) is provided with a front pivot (2) and a rear pivot (3) at both ends. The traveling wheels (4) are respectively installed at both ends of the front rotating shaft (2) and the rear rotating shaft (3); an auxiliary wheel (5) with the same axis as the traveling wheels (4) is provided on the outer side of the traveling wheels (4), and the auxiliary wheel (5) is fixedly connected to the traveling wheels (4); The track (6) is able to cooperate with the traveling wheel (4), and the curved rail (7) of the track (6) is provided with a pad (12) that can cooperate with the auxiliary wheel (5).

2. The OHT trolley walking structure according to claim 1, characterized in that, The diameter of the auxiliary wheel (5) is 0.6-0.8 times the diameter of the traveling wheel (4).

3. The OHT trolley traveling structure according to claim 1, characterized in that, The pad (12) is provided with connecting pieces (8) at both ends. The connecting pieces (8) are connected to the track (6) by connecting parts (9). A transition surface (13) is provided between the connecting pieces (8) and the upper surface of the pad (12).

4. The OHT trolley traveling structure according to claim 1, characterized in that, A shim (10) is provided between the shim strip (12) and the curved rail (7).

5. The OHT trolley traveling structure according to claim 1, characterized in that, The front axle (2) and the rear axle (3) are respectively provided with hinge shafts (11) in the middle part, and the front axle (2) and the rear axle (3) are respectively installed at both ends of the frame (1) using the hinge shafts (11).

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