Anti-inclination mechanism for preventing inclination of OHT crown block

Abstract

The invention discloses an anti-inclination mechanism for preventing an OHT crown block from inclining. The anti-inclination mechanism comprises a base, a micro motor, a transmission gear, a double-rotation-direction lead screw, a left bearing sliding block, a right bearing sliding block, a guide rail, a left rubber coating roller, a right rubber coating roller and other components. The micro motor drives the transmission gear to further drive the double-rotation-direction screw rod to rotate, so that the left bearing sliding block and the right bearing sliding block which are mounted on the screw rod are symmetrically translated; a left rubber-coated roller and a right rubber-coated roller are respectively fixed on the left bearing sliding block and the right bearing sliding block, and when the sliding blocks move to a preset position, the left rubber-coated roller and the right rubber-coated roller are in contact with the track to provide anti-inclination support; in a contraction state, the left rubber-coated roller and the right rubber-coated roller are separated from the track, so that the traveling smoothness of the crown block is guaranteed; the method can ensure that the OHT crown block can still keep the horizontal posture when the load changes or the gravity center shifts, so that the running safety and reliability of the OHT crown block are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor transport OHT overhead cranes, and in particular to an anti-tilt mechanism for preventing an OHT overhead crane from tilting. Background Art

[0002] The OHT crane is an important automated handling equipment in semiconductor workshops. It is used to transport wafer boxes along the track and accurately deliver them to the designated storage position or base. In actual operation, the OHT crane needs to deal with the instability caused by the change of the center of gravity. For example, when a fully loaded wafer box is moved from the bottom of the track to the side storage position, the shift of the center of gravity will cause the crane to tilt, increasing the risk of derailment and wafer box falling. Therefore, there must be an effective anti-tilt mechanism to ensure the horizontal posture of the crane during the transfer process. Summary of the invention

[0003] Technical purpose: In view of the shortcomings of the existing OHT overhead crane, the present invention discloses an anti-tilt mechanism for preventing the OHT overhead crane from tilting.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: An anti-tilt mechanism for preventing an OHT overhead crane from tilting comprises a base, a micro motor is fixedly mounted on the base, a transmission gear is connected to the output shaft of the micro motor, a double-rotation screw rod is also connected to the transmission gear, a left load-bearing slider and a right load-bearing slider are symmetrically mounted at both ends of the base, the left load-bearing slider and the right load-bearing slider are connected to the base via a guide rail arranged on the base, the double-rotation screw rod can drive the left load-bearing slider and the right load-bearing slider to translate along the guide rail as the transmission gear rotates; a left rubber-coated roller and a right rubber-coated roller are respectively mounted on the left load-bearing slider and the right load-bearing slider, when the left load-bearing slider and the right load-bearing slider move to a specific position, the left rubber-coated roller and the right rubber-coated roller are tangent to the oblique section of the track of the OHT overhead crane, so as to keep the OHT overhead crane level.

[0005] Preferably, a starting point limit detection device and an end point limit detection device are provided on the base, both the starting point limit detection device and the end point limit detection device include photoelectric sensors, and a baffle matching the photoelectric sensor is provided on the right load-bearing slider.

[0006] Preferably, the transmission gear comprises gear 1 and gear 2, gear 1 and gear 2 are meshed with each other, wherein gear 1 is connected to the output shaft of the micro motor, and gear 2 is connected to the birotation screw.

[0007] Preferably, the left load-bearing slider and the right load-bearing slider both include a nut seat, a slider and a connecting plate. The nut seat is connected to the double-rotation screw and can slide on the double-rotation screw. The slider is connected to the guide rail and can slide on the guide rail. The nut seat is connected to the slider through a connecting plate.

[0008] Preferably, the surfaces of the left rubber-coated roller and the right rubber-coated roller are both made of polyurethane material with a hardness of 90 degrees.

[0009] Preferably, a side plate is provided on the base, and the output shaft of the micro motor and the double-rotation screw both pass through the side plate and are connected to the transmission gear.

[0010] Preferably, two mounting ears are symmetrically arranged on the base for assisting the installation of the anti-tilt mechanism.

[0011] Beneficial effects: The anti-tilt mechanism for preventing an OHT overhead travelling crane from tilting provided by the present invention has the following beneficial effects: The present invention realizes symmetrical translation control through the cooperation of left and right load-bearing sliders and a double-rotation screw rod, and a left rubber-coated roller and a right rubber-coated roller are fixed on the left and right load-bearing sliders, respectively. When the OHT crane exchanges materials with the storage position, the micro motor drives the double-rotation screw rod to rotate, and the left and right load-bearing sliders translate toward each other, so that the left and right rubber-coated rollers are in tangential contact with the inclined surface of the track to provide horizontal support. This structure ensures that the crane can automatically adjust its posture to prevent tilting when the center of gravity shifts or the load changes, thereby effectively reducing the risk of material leakage and derailment. This anti-tilt support design provides stable support force during the interaction process of the OHT crane, greatly improving the safety and reliability during the handling process.

[0012] The left and right rubber-coated rollers of the present invention are made of polyurethane material with a hardness of 90 degrees. They are flexible and moderately hard, and can provide a buffering effect when in contact with the track, absorbing the tiny impact caused by errors, thereby avoiding wear caused by hard contact. This design not only extends the service life of the rollers and tracks, but also reduces the maintenance frequency and failure rate of the overhead crane system, and improves the overall durability and reliability of the equipment.

[0013] The present invention is equipped with a starting point limit detection device and an end point limit detection device, which are respectively located at the two ends of the translation range of the left and right load-bearing sliders, and can detect the slider position in real time and control the start and stop of the micro motor. When the slider moves to the set position, the limit detection device sends a signal to automatically stop the micro motor, thereby achieving precise extension and retraction of the roller. Through this automatic control design, the overhead crane can automatically adjust the support state in different operating states (such as normal walking or material interaction) without manual intervention, which improves the system's automation and ease of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0015] Figure 1 It is a schematic diagram of the anti-tilt mechanism of the present invention cooperating with the OHT overhead travelling crane and the track; Figure 2 is a side view of the anti-tilt mechanism of the present invention; Figure 3 is a top view of the anti-tilt mechanism of the present invention; Figure 4 It is a front view of the anti-tilt mechanism of the present invention.

[0016] In the figure: 1. base; 2. track; 3. micro motor; 4. transmission gear; 41. gear one; 42. gear two; 5. starting point limit detection device; 6. end point limit detection device; 7. double-rotation screw; 8. left load-bearing slider; 9. right load-bearing slider; 10. guide rail; 11. left rubber-coated roller; 12. right rubber-coated roller; 13. nut seat; 14. slider; 15. connecting plate; 16. side plate; 17. installation ear. DETAILED DESCRIPTION

[0017] The present invention will be described more clearly and completely below by way of a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiment.

[0018] like Figure 1-Figure 4 As shown, the present invention provides an anti-tilt mechanism for preventing an OHT crane from tilting, comprising a base 1, a micro motor 3 is fixedly mounted on the base 1, a transmission gear 4 is connected to the output shaft of the micro motor 3, a double-rotation screw rod 7 is also connected to the transmission gear 4, the micro motor 3 drives the double-rotation screw rod 7 to rotate by driving the transmission gear 4, a left bearing slider 8 and a right bearing slider 9 are symmetrically mounted at both ends of the double-rotation screw rod 7, the left bearing slider 8 and the right bearing slider 9 are connected to the base 1 through a guide rail 10 arranged on the base 1, the double-rotation screw rod 7 can drive the left bearing slider 8 and the right bearing slider 9 to translate along the guide rail 10 as the transmission gear 4 rotates, and the double-rotation screw rod 7 can translate symmetrically in opposite directions or in opposite directions along the guide rail 10, and the structural design of the double-rotation screw rod 7 ensures the dynamic balance of the left bearing slider 8 and the right bearing slider 9 when the center of gravity of the OHT crane is offset; A left rubber-coated roller 11 and a right rubber-coated roller 12 are respectively installed on the left load-bearing slider 8 and the right load-bearing slider 9. When the left load-bearing slider 8 and the right load-bearing slider 9 move to a specific position, the left rubber-coated roller 11 and the right rubber-coated roller 12 are tangent to the oblique section of the track 2 of the OHT overhead crane to keep the OHT overhead crane level; the surfaces of the left rubber-coated roller 11 and the right rubber-coated roller 12 are both made of polyurethane material with a hardness of 90 degrees and a certain degree of flexibility.

[0019] like Figure 3As shown, a starting point limit detection device 5 and an end point limit detection device 6 are provided on the base 1, and both the starting point limit detection device 5 and the end point limit detection device 6 include photoelectric sensors. A baffle matching the photoelectric sensor is provided on the right bearing slider 9. When the right bearing slider 9 reaches the starting point limit detection device 5 or the end point limit detection device 6, the starting point limit detection device 5 or the end point limit detection device 6 controls the micro motor 3 to stop running through a signal, thereby realizing precise extension and retraction control of the left rubber-coated roller 11 and the right rubber-coated roller 12.

[0020] like Figure 2 As shown, the transmission gear 4 includes a gear 1 41 and a gear 2 42 , and the gear 1 41 and the gear 2 42 are meshed with each other, wherein the gear 1 41 is connected to the output shaft of the micro motor 3 , and the gear 2 42 is connected to the double-rotation screw 7 .

[0021] like Figure 4 As shown, the left load-bearing slider 8 and the right load-bearing slider 9 both include a nut seat 13, a slider 14 and a connecting plate 15. The nut seat 13 is connected to the double-rotation screw 7 and can slide on the double-rotation screw 7. The slider 14 is connected to the guide rail 10 and can slide on the guide rail 10. The nut seat 13 and the slider 14 are connected via a connecting plate 15.

[0022] In one embodiment, a side plate 16 is provided on the base 1, and the output shaft of the micro motor 3 and the double-rotation screw 7 are both connected to the transmission gear 4 through the side plate 16. The side plate 16 can provide a supporting and fixing effect, so that the rotation between the micro motor 3, the transmission gear 4 and the double-rotation screw 7 is more stable.

[0023] In one embodiment, two mounting ears 17 are symmetrically arranged on the base 1 to assist in the installation of the anti-tilt mechanism to ensure the stability of the anti-tilt mechanism.

[0024] The working principle of the present invention is as follows: Figure 1 As shown, the anti-tilt mechanism of the present invention is installed at the guide rail 2 of the OHT overhead travelling vehicle where the storage position is located. When the OHT overhead travelling vehicle is moving normally, the micro motor 3 does not work, the left rubber-coated roller 11 and the right rubber-coated roller 12 are in a retracted state, the baffle of the right bearing slider 9 blocks the photoelectric sensor at the end limit detection device 6, and the two rubber-coated rollers do not contact the oblique section of the track 2 of the OHT overhead travelling vehicle; When the OHT overhead crane needs to exchange materials with the storage position, the micro motor 3 starts to rotate, and drives the double-rotation screw 7 to rotate through the transmission gear 4. The double-rotation screw 7 drives the left load-bearing slider 8 and the right load-bearing slider 9 to translate symmetrically along the guide rail 10, so that the left rubber-coated roller 11 and the right rubber-coated roller 12 are respectively extended. When the baffle of the right load-bearing slider 9 blocks the photoelectric sensor of the starting point limit detection device 5, the micro motor 3 stops rotating. At this time, the surfaces of the left and right rubber-coated rollers are in contact with the inclined cross-section of the track to provide support force to prevent the OHT overhead crane from tilting; in this state, the OHT overhead crane can stably exchange materials with the storage position. After the interaction is completed, the OHT overhead crane leaves the storage position, and the micro motor 3 runs in the opposite direction, driving the left and right rubber-coated rollers to retract to the original position. At this time, the baffle of the right load-bearing slider 9 blocks the photoelectric sensor of the end point limit detection device 6, and the micro motor 3 stops running.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An anti-tilt mechanism for preventing an OHT overhead travelling crane from tilting, characterized in that: The invention comprises a base (1), on which a micro motor (3) is fixedly mounted, a transmission gear (4) is connected to the output shaft of the micro motor (3), a double-rotation screw rod (7) is also connected to the transmission gear (4), a left bearing slider (8) and a right bearing slider (9) are symmetrically mounted at both ends of the base (1), the left bearing slider (8) and the right bearing slider (9) are connected to the base (1) via a guide rail (10) arranged on the base (1), and the double-rotation screw rod (7) can drive the left bearing slider (8) and the right bearing slider (9) to translate along the guide rail (10) as the transmission gear (4) rotates; a left rubber-coated roller (11) and a right rubber-coated roller (12) are respectively mounted on the left bearing slider (8) and the right bearing slider (9), and when the left bearing slider (8) and the right bearing slider (9) move to a specific position, the left rubber-coated roller (11) and the right rubber-coated roller (12) are tangent to the oblique section of the track (2) of the OHT overhead travelling vehicle, so as to keep the OHT overhead travelling vehicle horizontal.

2. The anti-tilt mechanism for preventing an OHT overhead travelling crane from tilting according to claim 1, characterized in that: A starting point limit detection device (5) and an end point limit detection device (6) are provided on the base (1), the starting point limit detection device (5) and the end point limit detection device (6) both include photoelectric sensors, and a baffle plate that cooperates with the photoelectric sensor is provided on the right bearing slide block (9).

3. The anti-tilt mechanism for preventing an OHT overhead travelling crane from tilting according to claim 1, characterized in that: The transmission gear (4) comprises a gear 1 (41) and a gear 2 (42), wherein the gear 1 (41) and the gear 2 (42) are meshed with each other, wherein the gear 1 (41) is connected to the output shaft of the micro motor (3), and the gear 2 (42) is connected to the double-rotation screw (7).

4. The anti-tilt mechanism for preventing an OHT overhead travelling crane from tilting according to claim 1, characterized in that: The left load-bearing slider (8) and the right load-bearing slider (9) both comprise a nut seat (13), a slider (14) and a connecting plate (15); the nut seat (13) is connected to the double-rotation screw rod (7) and can slide on the double-rotation screw rod (7); the slider (14) is connected to the guide rail (10) and can slide on the guide rail (10); the nut seat (13) and the slider (14) are connected via the connecting plate (15).

5. The anti-tilt mechanism for preventing an OHT overhead travelling crane from tilting according to claim 1, characterized in that: The surfaces of the left rubber-coated roller (11) and the right rubber-coated roller (12) are both made of polyurethane material with a hardness of 90 degrees.

6. The anti-tilt mechanism for preventing an OHT overhead travelling crane from tilting according to claim 1, characterized in that: A side plate (16) is provided on the base (1), and the output shaft of the micro motor (3) and the double-rotation screw rod (7) both pass through the side plate (16) and are connected to the transmission gear (4).

7. The anti-tilt mechanism for preventing an OHT overhead travelling crane from tilting according to claim 1, characterized in that: Two mounting ears (17) are also symmetrically arranged on the base (1) for assisting in mounting the anti-tilt mechanism.

Images