Precise positioning and sudden stop control system for bridge crane and working method

Abstract

The invention discloses a bridge crane accurate positioning and sudden stop control system and a working method.The bridge crane accurate positioning and sudden stop control system comprises a main beam, a driving frame, two guiding limiting devices and a deflection sudden stop device, the two guiding limiting devices are arranged on the driving frame in the length direction of the driving frame, and the main beam is erected on the driving frame and is in sliding fit with the driving frame; the two ends of the main beam are each provided with a running structure, the guiding and limiting devices are matched with the running structures, the main beam is in sliding fit with a crane carriage, a hoisted object is hoisted below the crane carriage, and the two sides of the hoisted object and the two running structures are connected together through the two deflection emergency stop devices correspondingly; through cooperative cooperation of the guiding and limiting device, the driving structure and the deflection emergency stop device, stable guiding of the main beam along the driving frame is achieved, inertial deflection of a hoisted object is utilized to trigger separation of the lifting block and the driving column, the lifting unit is switched to a limiting state, and finally accurate positioning and safe operation in the hoisting process of the bridge crane are achieved.

Description

Technical Field

[0001] This invention belongs to the field of lifting and transportation equipment technology, and more specifically, it is a precise positioning and emergency stop control system and working method for a bridge crane. Background Technology

[0002] Bridge cranes, as core equipment for heavy object handling in the industrial field, are widely used in machinery manufacturing, warehousing and logistics, metallurgy and chemical industries. During operation, the precise positioning accuracy of the main beam along the traveling frame and the ability to safely control the inertial deflection of the hoisted object directly determine the efficiency and safety of the hoisting operation. In existing technologies, for the positioning requirements of the main beam along the traveling frame, the mainstream solutions adopt fixed physical limit structures or independent photoelectric sensors to trigger braking: the former achieves limit by rigid blocking with a preset stroke, which can only adapt to static positioning under specific working conditions and cannot be dynamically adjusted according to the hoisting load and travel speed; the latter relies on external signal acquisition and transmission, and is affected by environmental dust and vibration, with a response delay of 0.3-0.5 seconds, making it difficult to capture the dynamic deviation of the main beam during travel in real time. To address the issue of inertial deflection of suspended objects, existing technologies mostly employ passive protection measures, such as using high-strength steel cables, adding anti-sway supports, or manually adjusting the hoisting posture. When the main beam accelerates, decelerates, or changes direction, the suspended object cannot move synchronously with the main beam due to inertia, which easily leads to lateral deflection. The lateral tension generated by the deflection not only causes a sudden change in the tension of the steel cable, leading to the risk of fatigue breakage, but also causes the main beam, which has already triggered braking, to rebound and deviate, significantly reducing positioning accuracy and even causing safety accidents such as the suspended object colliding with the equipment frame. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a precise positioning and emergency stop control system and working method for a bridge crane. Through the coordinated cooperation of the guide limit device, the traveling structure, and the deflection emergency stop device, the main beam is smoothly guided along the traveling frame. The inertial deflection of the hoisted object triggers the separation of the lifting block from the drive column, so that the lifting unit switches to the limit state, and finally achieves precise positioning and safe operation of the bridge crane.

[0004] Technical Solution: To achieve the above objectives, the present invention provides a precise positioning and emergency stop control system and operating method for a bridge crane, comprising a main beam, a traveling frame, guide and limiting devices, and deflection emergency stop devices. Two guide and limiting devices are arranged on the traveling frame along its length. The main beam is mounted on the traveling frame and slides in cooperation with it. Travel structures are provided at both ends of the main beam. The guide and limiting devices are configured to cooperate with the traveling structures. A crane trolley is slidably mounted on the main beam, and a load is hoisted below the crane trolley. The two deflection emergency stop devices are respectively connected to the two traveling structures on both sides of the load. During normal travel, the guide and limiting devices cooperate with the traveling structures, thereby guiding the sliding of the main beam relative to the traveling frame. When the load reaches its deflection limit due to inertia, the deflection emergency stop device disconnects the cooperation between the traveling structure and the guide and limiting devices, thereby limiting the traveling structure and preventing relative movement between the main beam and the traveling frame.

[0005] Furthermore, each of the aforementioned guide and limiting devices includes a plurality of lifting units arranged along the length direction of the travel frame and a plurality of lifting seats that cooperate with the lifting units. The travel frame is provided with mating grooves on both sides along the length direction. The plurality of lifting seats are fixedly installed on the bottom surface of the mating grooves along the length direction of the mating grooves. Each of the aforementioned lifting units is respectively installed on each of the lifting seats. The cooperation between the lifting unit and the lifting seat enables the lifting unit to move vertically up and down relative to the lifting seat. When the lifting unit moves to the lowest position relative to the lifting seat, the uppermost end of the lifting unit still protrudes through the mating groove and out of the upper surface of the travel frame.

[0006] Furthermore, the two mating grooves are respectively opened on the two long beams along the length direction of the traveling frame. The openings of the two mating grooves are oriented towards the center plane of the traveling frame in the width direction. Each mating groove has a guide opening along the length direction on the upper groove wall in the vertical direction. A plurality of lifting seats are installed on the lower groove wall in the vertical direction of the mating groove, corresponding to the guide opening. When the plurality of lifting units are installed on the lifting seats, the upper end of the lifting unit protrudes through the guide opening and onto the upper surface of the traveling frame.

[0007] Furthermore, the lifting unit includes a rectangular column, a circular column, a drive column, and a rotating connector; the circular column is rotatably mounted at the center of one side of the rectangular column via the rotating connector, and the drive column is vertically connected to the outer circumferential wall of the circular column near the end of the rectangular column; the lifting seat includes a mating block, and the mating block has a lifting groove at the center of the side near the lifting unit that can mate with the circular column. A lifting structure is provided between the inner circumferential wall of the lifting groove and the outer circumferential wall of the circular column away from the rectangular column; in the assembled state, the end of the rectangular column away from the circular column protrudes through the guide opening onto the upper surface of the travel frame, and the end of the drive column away from the circular column passes through the opening of the mating groove and extends outside the mating groove. The lifting structure can drive the circular column to rise or fall vertically relative to the lifting groove, thereby placing the lifting unit in a high or low position.

[0008] Furthermore, the lifting structure includes a ball groove formed on the inner circumferential wall of the lifting slot and an embedding groove formed on the outer circumferential surface of the circular column away from the rectangular column; the ball groove includes a highest point and two lowest points, the two lowest points being distributed on both sides of the highest point, and the two lowest points coinciding with the two ends of the ball groove respectively; a ball is rolled in the ball groove; a compression spring is provided at both ends of the ball groove, the two compression springs extending along the contour of the ball groove, and the ends of the two compression springs approaching each other abut against the two sides of the ball respectively; the ball protrudes... The ball bearings are partially rolled into the embedded groove. In the initial state, the ball bearings are located at the highest point of the ball bearing groove under the action of the two compression springs. When the main beam slides relative to the traveling frame, the traveling structure can contact the drive column and drive the circular column to rotate along its own axis. The rolling engagement between the ball bearing groove and the ball bearings allows the circular column to move vertically downward relative to the mating block with the rectangular block. When the traveling structure separates from the drive column, the compression springs can drive the ball bearings to roll back in the ball bearing groove, thereby causing the circular column to return to its vertical position relative to the mating block.

[0009] Furthermore, the travel structure includes a travel wheel, a mating structure, a mounting beam, and a hub drive device. The mounting beam is vertically mounted at both ends of the main beam, and the travel wheel is rolled on the mounting beam. The mating structure is mounted on the side of the mounting beam closest to the main beam, corresponding to the travel wheel. In the assembled state, the mating structure is located at the opening of the mating groove, and the drive columns of multiple lifting units simultaneously abut against the side of the mating structure away from the main beam, thereby placing the lifting unit located near the travel wheel in a low position.

[0010] Furthermore, each of the circumferential surfaces of the traveling wheel has a limiting groove corresponding to a rectangular column. In the low position, the uppermost end face of the rectangular column is tangentially engaged with the circumferential surface of the bottom of the upper limiting groove of the traveling wheel, and the upper ends of the two side walls of the rectangular column are respectively in contact with the two groove walls of the upper limiting groove of the traveling wheel. In the high position, the uppermost end face of the rectangular column is higher than the axis of the traveling wheel in the vertical direction, and the side wall of the two rectangular columns located on both sides of the traveling wheel is embedded in the limiting groove.

[0011] Furthermore, the mating structure includes a rectangular sliding sleeve, a rectangular lifting block, and a steel cable. The sliding sleeve is installed on the side of the mounting beam near the main beam, and the lowest end of the sliding sleeve is vertically higher than the upper surface of the drive column in the lifting unit when it is in the high position. The lifting block is slidably fitted inside the sliding sleeve. A connection port is opened on the side wall of the sliding sleeve near the main beam and near the crane trolley. One end of the steel cable is fixedly connected to the lifting block, and the other end passes through the connection port and is connected to one side of the suspended object. During normal travel, the end of the lifting block away from the main beam is located outside the sliding sleeve and simultaneously abuts against the drive columns of multiple lifting units, thereby putting each of the above-mentioned lifting units in a low position. When the suspended object reaches the deflection limit, the lifting block, under the action of the steel cable, simultaneously separates from the drive columns in each of the above-mentioned lifting units, thereby restoring each of the above-mentioned lifting units that is not in contact with the travel wheel to the high position.

[0012] Furthermore, the cooperating structure also includes an electric retrieval device. The lifting block has a cable machine installation space, and the electric retrieval device is fixedly installed in the cable machine installation space. One end of the steel rope is fixed to the electric retrieval device, and the other end passes through the connection port and is connected to one side of the suspended object. The electric retrieval device can adjust the length of the steel rope according to the lifting requirements and the lifting process.

[0013] Furthermore, a method for operating a bridge crane precision positioning and emergency stop control system includes the following steps:

[0014] Step 1: The object to be lifted is hoisted under the crane trolley, and the electric retrieval device adjusts the length of the steel cable according to the hoisting requirements; at this time, the end of the lifting block away from the main beam is located outside the sliding sleeve, and all the lifting units located near the traveling wheel are in a low position.

[0015] Step 2: Start the hub drive device to drive the travel wheel to roll, which in turn drives the main beam to slide relative to the travel frame. During the travel, the lifting block abuts against the drive column in each lifting unit in the direction of travel in sequence, so that each lifting unit is in a low position in sequence.

[0016] Step 3: Simultaneously, during the driving process, the drive columns in each lifting unit that is opposite to the driving direction separate from the lifting block in sequence, thereby causing each lifting unit to reset to the high position in sequence.

[0017] Step 4: When the suspended object deflects due to inertia, the suspended object drives the lifting block to slide vertically upward relative to the sliding sleeve through the steel cable; thereby separating each drive column that is in contact with the lifting block from the lifting block, so that the lifting units that are not in contact with the travel wheel in each of the above-mentioned drive columns are reset to the high position, while the lifting units that are in contact with the travel wheel are still in the low position under the action of the travel wheel;

[0018] Step 5: When the main beam slides to the set position, the suspended object will inevitably deflect due to inertia. At this time, under the action of the deflection emergency stop device, the guide limit device can accurately position the main beam.

[0019] Beneficial Effects: The precise positioning and emergency stop control system and working method for a bridge crane of the present invention have the following beneficial effects compared with the prior art:

[0020] 1. By dynamically adjusting the lifting unit and closely cooperating with the traveling wheels and rectangular blocks, the lateral displacement of the main beam is limited, ensuring a stable travel trajectory and reducing hoisting position deviation;

[0021] 2. The lifting block is directly driven by the inertial deflection of the suspended object, without the need for additional sensors. This achieves direct linkage between the main beam and the inertial deflection of the suspended object, thus avoiding overtravel slippage.

[0022] 3. The rolling transmission of ball grooves and balls is used instead of sliding transmission. Combined with the protective function of the grooves, component wear is reduced and service life is extended.

[0023] 4. The modular design of the guide limit device allows for free length adjustment according to different travel frames and facilitates maintenance and replacement;

[0024] 5. By using the low-position guidance of each lifting unit near the traveling wheel and the high-position limit of the remaining lifting unit, a double constraint is formed on the traveling wheel. The timely reset design during the limit can provide all-round protection for the main beam 1 and reduce safety hazards.

[0025] 6. No additional power is needed to drive the lifting unit for adjustment; function switching is achieved through component linkage, simplifying the system structure and reducing energy consumption. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a bridge crane precision positioning and emergency stop control system according to this scheme;

[0027] Figure 2 This is a magnified view of a portion of the image (A).

[0028] Figure 3 This is a schematic diagram of the chassis structure;

[0029] Figure 4 This is a magnified view of part B;

[0030] Figure 5 This is a schematic diagram of the assembly of the guide and limiting device and the mating groove;

[0031] Figure 6 This is an assembly diagram of the lifting unit and the lifting base;

[0032] Figure 7 This is a structural schematic diagram of the lifting unit;

[0033] Figure 8 This is a sectional view of the lifting seat;

[0034] Figure 9 This is a schematic diagram of the assembly of the running gear and the main beam. Detailed Implementation

[0035] The invention will now be further described with reference to the accompanying drawings.

[0036] As attached Figures 1-5As shown, a bridge crane precision positioning and emergency stop control system includes a main beam 1, a traveling frame 2, guide and limit devices 3, and a deflection emergency stop device 4. The two guide and limit devices 3 are arranged along the length of the traveling frame 2 on its upper surface. The main beam 1 is mounted on the traveling frame 2 and slides in cooperation with it. Travel structures 5 are provided at both ends of the main beam 1. The guide and limit devices 3 are configured to cooperate with the travel structures 5. A crane trolley 6 is slidably mounted on the main beam 1, and a crane is hoisted below the crane trolley 6. When suspending an object, the two deflection emergency stop devices 4 are respectively connected to the two traveling structures 5 on both sides of the suspended object. The deflection emergency stop devices 4 establish a linkage between the suspended object and the traveling structure 5, allowing the deflection state of the suspended object to be directly fed back to the traveling structure 5. During normal travel, the guide limiting device 3 cooperates with the traveling structure 5, thereby guiding the sliding of the main beam 1 relative to the traveling frame 2, limiting the lateral displacement of the main beam 1 during sliding, and ensuring that the main beam 1 always moves horizontally along the length direction of the traveling frame 2. The system ensures stable movement, preventing positional deviations of the trolley 6 and the hoisted item due to main beam offset, thus improving hoisting stability and reducing the risk of collisions caused by trajectory deviation. When the hoisted item reaches its deflection limit due to inertia, the deflection emergency stop device 4 can disconnect the cooperation between the traveling structure 5 and the guide limit device 3, thereby limiting the traveling structure 5 and preventing relative movement between the main beam 1 and the traveling frame 2. The deflection emergency stop device 4 can convert the inertial deflection of the hoisted item into an emergency stop signal. Through the cooperation between the deflection emergency stop device 4 and the traveling structure 5, the function of the guide limit device 3 can be quickly switched, changing from "guiding" the main beam 1 to "limiting" it, achieving immediate braking of the main beam 1, preventing overtravel due to inertia, ensuring operational safety. Furthermore, since the main beam 1 needs to stop in time when it travels to the predetermined position on the traveling frame 2, and there is a sudden change in speed during the stopping process, the cooperation between the deflection emergency stop device 4 and the traveling structure 5 can also accurately position the main beam 1.

[0037] Each of the guide and limiting devices 3 includes a plurality of lifting units 7 arranged along the length direction of the travel frame 2 and a plurality of lifting seats 8 that cooperate with the lifting units 7. The travel frame 2 has mating grooves 9 on both sides along the length direction. The plurality of lifting seats 8 are fixedly installed on the bottom surface of the mating grooves 9 along the length direction of the mating grooves 9. Each of the lifting units 7 is respectively installed on each lifting seat 8. The cooperation between the lifting unit 7 and the lifting seat 8 enables the lifting unit 7 to move vertically up and down relative to the lifting seat 8. When the lifting unit 7 moves to the bottommost position relative to the lifting seat 8, the uppermost end of the lifting unit 7 still protrudes through the mating groove 9 and protrudes from the upper surface of the travel frame 2, thereby forming a structure similar to a "guide bar" to guide the travel structure 5.

[0038] The two mating grooves 9 are respectively formed on the two long beams of the traveling frame 2 along its length. Both mating grooves 9 are horizontally placed "U"-shaped grooves, and the openings of the two mating grooves 9 are on the side of the two long beams that are close to each other. That is, the openings of the two mating grooves 9 point towards the center plane of the traveling frame 2 in the width direction. The design of the "U"-shaped openings pointing towards the center plane of the traveling frame 2 allows the drive end of the lifting unit 7 to be accurately aligned with the traveling structure 5, avoiding misalignment. The corresponding installation of the guide port 26 and the lifting seat 8 limits the vertical movement path of the lifting unit 7, preventing its lateral deviation, further improving the working accuracy of the guide limiting device 3, and ensuring the alignment of the traveling structure 5. The constraint is stable and reliable; the outer surface of the upper groove wall of each of the mating grooves 9 in the vertical direction is the upper surface of the running frame 2, and a guide opening 26 is provided on the groove wall along the length direction. Several lifting seats 8 are installed on the inner surface of the groove wall of the mating groove 9 in the vertical direction corresponding to the guide opening 26. When several lifting units 7 are installed on the lifting seats 8, the upper end of the lifting unit 7 passes through the guide opening 26 and protrudes from the upper surface of the running frame 2.

[0039] like Figures 6-8As shown, the lifting unit 7 includes a rectangular column 10, a circular column 11, a drive column 12, and a rotating connector 27. The circular column 11 is rotatably mounted at the center of one side of the rectangular column 10 via the rotating connector 27. The rotating connector 27 is a rotating joint or other rotating connection structure. The rotating connector 27 ensures that the circular column 11 can rotate stably around the center of the rectangular column 10, avoiding eccentricity or jamming, ensuring smooth force transmission, and simultaneously allowing the rectangular column 10 to move synchronously with the circular column 11. The drive column 12 is vertically connected to the outer circumferential wall of the circular column 11 near the end of the rectangular column 10. The drive column 12 can efficiently transmit the force applied by the traveling structure 5 to the circular column 11, enabling the circular column 11 to quickly respond to external forces and rotate, reducing force transmission loss, and ensuring the smooth operation of the lifting unit 7. The lifting unit 7 is adjusted in a timely manner. The lifting seat 8 includes a mating block. A lifting groove 13, which mates with a circular column 11, is located at the center of the mating block near the lifting unit 7. A lifting structure 14 is provided between the inner circumferential wall of the lifting groove 13 and the outer circumferential wall of the circular column 11 at the end away from the rectangular column 10. This lifting structure 14 converts the rotation of the circular column 11 into vertical movement, thus adjusting the height of the lifting unit 7. In the assembled state, the end of the rectangular block 10 away from the circular column 11 protrudes through the guide opening 26 onto the upper surface of the travel frame 2. The end of the drive column 12 away from the circular column 11 passes through the opening of the mating groove 9 and extends outside the mating groove 9. The lifting structure can drive the circular column 11 to rise or fall vertically relative to the lifting groove 13, thereby changing the distance of the rectangular block 10 protruding from the upper surface of the travel frame 2, thus placing the lifting unit 7 in a high or low position. The lifting structure 14, by driving the circular column 11 to move, flexibly adjusts the protruding height of the rectangular block 10, allowing the lifting unit 7 to quickly switch between two functions to meet the needs of different stages of the system.

[0040] The lifting structure includes a ball groove 15 formed on the inner circumferential wall of the lifting groove 13 and an embedding groove 16 formed on the outer circumferential surface of the circular column 11 away from the rectangular column 10. The ball groove 15 includes a highest point and two lowest points, with the two lowest points distributed on both sides of the highest point and coinciding with the two ends of the ball groove 15. A ball 19 is rolled within the ball groove 15. Compression springs 20 are provided at both ends of the ball groove 15, extending along the contour of the ball groove 15, with the ends of the two compression springs 20 abutting against the sides of the ball 19. The portion of the ball 19 protruding from the ball groove 15 is rolled within the embedding groove 16. The rolling engagement of the ball 19 with the ball groove 15 and the embedding groove 16 smoothly converts the rotation of the circular column 11 into vertical movement, ensuring smooth movement and stable height adjustment. Extending along the contour and abutting the ball bearing 19, it provides continuous restoring elasticity, ensuring that the ball bearing 19 quickly returns to its original position after losing force, and also ensures that the ball bearing 19 always adheres to the inner wall of the ball groove 15, preventing it from deviating from the track and causing transmission failure. In the initial state, the ball bearing 19 is located at the highest point of the ball groove 15 under the action of the two compression springs 20, thus maintaining pre-constraint when the lifting unit 7 is not in contact with the traveling structure 5, preventing the traveling structure 5 from deviating when it starts. When the main beam 1 slides relative to the traveling frame 2, the traveling structure 5 can drive the column 12 to contact, and through the drive column 12, drive the circular column 11 to rotate along its own axis. The contact and cooperation between the traveling structure 5 and the drive column 12 realizes the linkage between the sliding of the main beam and the adjustment of the lifting unit, so that the lifting unit 7 The adjustment is synchronized with the movement of the main beam in real time. No additional power is required while ensuring that the adjustment is synchronized with the driving. The rolling engagement between the ball groove 15 and the ball 19 allows the circular column 11 to move vertically downward relative to the mating block with the rectangular block. When the driving structure 5 separates from the drive column 12, the compression spring 20 can drive the ball 19 to roll back in the ball groove 15, thereby causing the circular column 11 to return to vertically upward relative to the mating block. This ensures that the lifting unit 7 can quickly return to the high position after losing force, and forms a limit constraint in time to avoid the main beam from continuing to slide due to reset delay.

[0041] The modular design of the lifting unit 7 and lifting seat 8 allows for individual disassembly and replacement of damaged modules when a lifting unit 7 malfunctions due to wear of the ball bearing 19, failure of the compression spring 20, deformation of the rectangular column 10, or damage to the inner wall of the lifting groove 13 of the lifting seat 8. This eliminates the need to dismantle the entire guide limit device 3, reducing maintenance downtime, lowering maintenance costs, and avoiding the waste of other intact lifting units 7 and lifting seats 8 due to overall replacement. Furthermore, the number of lifting units 7 and lifting seats 8 can be flexibly increased or decreased, or the spacing between adjacent lifting units 7 can be adjusted, based on the actual travel distance of the bridge crane, the weight of the lifting load, and the positioning accuracy requirements, without redesigning the overall structure of the guide limit device 3.

[0042] like Figure 2 and 9 As shown, the driving structure 5 includes a driving wheel 21, a mating structure 22, a mounting beam 23, and a hub drive device 24. The mounting beam 23 is vertically installed at both ends of the main beam 1, and the driving wheel 21 is rolled on the mounting beam 23. The mating structure 22 is installed on the side of the mounting beam 23 near the main beam 1, corresponding to the driving wheel 21. The corresponding installation of the mating structure 22 and the driving wheel 21 ensures that the mating structure 22 can accurately act on the lifting unit 7 near the driving wheel 21, so that the lifting unit 7 in this area can switch to the guiding state in time, avoiding guidance interruption due to mating deviation. In the assembled state, at the groove of the mating groove 9, the drive columns 12 of multiple lifting units 7 simultaneously abut against the side of the mating structure 22 away from the main beam 1, so that the lifting unit 7 located near the driving wheel 21 is in a low position and guides the driving wheel 21, while the remaining lifting units 7 are still in a high position and limit the driving wheel 21. In this way, the low-position lifting unit 7 can ensure the accurate trajectory of the driving wheel 21, and the high-position lifting unit 7 can also ensure the accurate trajectory of the driving wheel 21. A protective ring is formed to prevent sudden deviation of the driving wheel 21, achieving dual protection of guidance and safety, and improving operational safety.

[0043] Each of the travel wheels 21 has a limiting groove 30 corresponding to the rectangular block 10 on its circumferential surface. In the low position, the uppermost end face of the rectangular column 10 is tangentially engaged with the circumferential surface of the bottom of the limiting groove 30 of the travel wheel 21. The upper ends of the two side walls of the rectangular column 10 are respectively in contact with the two groove walls of the limiting groove 30 of the travel wheel 21, and the engagement between the rectangular column 10 and the limiting groove 30 can guide the travel wheel 21. The rectangular column 10 and the limiting groove 30 form a tight fit. In the high position, the uppermost end face of the rectangular column 10 is higher than the axis of the travel wheel 21 in the vertical direction, and the side walls of the two rectangular columns 10 located on both sides of the travel wheel 21 are embedded in the limiting groove 30, thereby limiting the travel wheel 21. The rectangular block 10, positioned above the axis of the traveling wheel 21, can block the traveling wheel 21 from above. Combined with the constraints of the embedded limiting grooves on both sides, it restricts the rotation and movement of the traveling wheel 21 in all directions, preventing continued rolling due to inertia, achieving efficient limiting, and ensuring that the main beam 1 is quickly fixed when it stops suddenly.

[0044] like Figure 1 and 2 As shown, the mating structure 22 includes a rectangular sliding sleeve 14, a rectangular lifting block 17, and a steel cable 18. The sliding sleeve 14 is installed on the side of the mounting beam 23 near the main beam 1, and the lowest end of the sliding sleeve 14 is vertically higher than the upper surface of the drive column 12 in the lifting unit 7 when it is in a high position. The installation height of the sliding sleeve 29 avoids collision with the drive column 12 and reserves space for the mating of the lifting block 30 and the drive column 12. The lifting block 17 is slidably fitted inside the sliding sleeve 14, and the width of the lifting block 17 is greater than the wheel diameter of the traveling wheel 21. A connection port 29 is opened on the side wall of the sliding sleeve 14 near the main beam 1 and near the lifting trolley 6. One end of the steel cable 18 is fixedly connected to the lifting block 17, and the other end passes through the connection port 29 and is connected to one side of the suspended object. During normal travel, the end of the lifting block 17 away from the main beam 1 is outside the sliding sleeve 14 and simultaneously abuts against the drive columns 12 of multiple lifting units 7, thereby... The aforementioned lifting units 7 are in a low position and guide the travel wheels 21. When the suspended object deflects due to inertia, the steel rope 18 drives the lifting block 17 to slide relative to the sliding sleeve 14 towards the main beam 1. When the suspended object reaches the deflection limit, the lifting block 17, under the action of the steel rope 18, simultaneously separates from the drive column 12 in each of the aforementioned lifting units 7, thereby resetting each of the aforementioned multiple lifting units 7 that is not in contact with the travel wheels 21 to a high position and limiting the travel wheels.

[0045] It is important to emphasize that the width of the lifting block 17 is only slightly larger than the diameter of the traveling wheel 21. The engagement between the drive column 12 and the lifting block 17 is gradual. That is, after the drive column 12 in the lifting unit 7, which is in a high position, contacts the lifting block 17, the main beam 1 still needs to slide a certain distance along the traveling frame 2 before it can be changed to a low position. It is not that the low or high position of the lifting unit 7 can be changed as soon as the drive column 12 contacts the lifting block 17. Therefore, the lifting block 17 is designed so that the lifting unit 7 changes from a high position to a low position just as it contacts the traveling wheel 21, without affecting the limiting effect of the rectangular block 10 on the traveling wheel 21.

[0046] The cooperating structure 22 also includes an electric retrieval device. The lifting block 17 has a cable machine installation space. The electric retrieval device is fixedly installed in the cable machine installation space. One end of the steel rope 18 is fixed to the electric retrieval device, and the other end passes through the connection port 29 and is connected to one side of the suspended object. The electric retrieval device can adjust the length of the steel rope 18 according to the lifting requirements and the lifting process.

[0047] As those skilled in the art should know, during the hoisting process, the main beam 1 typically slides along the traveling frame 2 to a preset position, and then the hoisting trolley 6 moves along the main beam 1 to the target position. Therefore, during the process of installing the hoisted item on the hoisting trolley 6, the length of the steel cable 18 is adjusted by the electric retraction device to ensure that the steel cable 18 has pre-tension in the initial stage, preparing for the subsequent transmission of deflection force and avoiding the weakening of the emergency stop device triggering effect due to improper length. When the main beam 1 moves, the electric retraction device can ensure that the length of the steel cable 18 does not change. When the hoisting trolley 6 moves, the electric retraction device can retract or unwind the steel cable 18, so that the hoisted item can move with the hoisting trolley 6. In addition, a tension sensor can be integrated into the electric retraction device to monitor the force on the steel cable 18 in real time, so that the electric retraction device can autonomously adjust the length of the steel cable 18 according to the tension of the steel cable 18 during the movement of the hoisting trolley 6.

[0048] When the main beam 1 slides, the suspended object deflects due to inertia, changing its motion state. This deflection generates a lateral tension, which acts on the steel cable 18, which connects the suspended object at one end and the lifting block 17 at the other. Since the electric retrieval device has already pre-tensioned the steel cable 18 with no slack, the tension directly causes the steel cable 18 to tend to change length. However, the electric retrieval device has already limited the length of the steel cable 18, so the length of the steel cable 18 cannot actually be increased. But because the rectangular structure of the sliding sleeve 14 constrains the lifting block 17 to slide only vertically, the tendency of the steel cable 18 to change length is converted into a driving force that drives the lifting block 17 to slide upward along the inner wall of the sliding sleeve 14, causing the lifting block 17 to undergo vertical displacement. This displacement causes the lifting block 17 to disengage from the drive column 12 of the lifting unit 7, and the drive column 12 loses external pressure. At this time, for the lifting unit 7, which is not in contact with the traveling wheel 21, the compression spring 20... The rolling of the ball bearings in the ball bearing groove 15 will cause the circular column 11 to move upward. The movement of the circular column 11 will further reset the rectangular column to the high position and form a pre-limit position for the traveling wheel 21. As for the lifting unit 7 in contact with the traveling wheel 21, the traveling wheel 21 will continuously apply downward pressure to the rectangular column. This pressure will counteract the reset force of the compression spring 20, so that the lifting unit 7 will remain in the low position. Finally, through the above transmission relationship, the linkage from the deflection of the suspended object to the state differentiation of the lifting unit is realized.

[0049] More specifically, a guide wheel can be installed at the connection port 29, with a section of the steel rope 18 wound around the guide wheel. The guide wheel can reduce the friction between the steel rope 18 and the edge of the connection port 29, preventing wear on the steel rope 18 and extending its service life. At the same time, the rolling characteristics of the guide wheel reduce the moving resistance of the steel rope 18, ensuring that it smoothly pulls the lifting block 17 and improving the system response speed. Furthermore, the guide wheel can be changed to a guide wheel assembly, so that when the suspended object deflects, the difference in the change of the steel rope 18 on both sides of the guide wheel assembly can be further amplified.

[0050] A method for operating a precision positioning and emergency stop control system for a bridge crane includes the following steps:

[0051] Step 1: The object to be lifted is hoisted below the lifting trolley 6. The electric retraction device adjusts the length of the steel cable 18 according to the lifting requirements. By adjusting the length of the steel cable 18 through the electric retraction device, the tension of the steel cable 18 is ensured to be appropriate in the initial stage, which is to prepare for the subsequent transmission of deflection force and avoid the emergency stop device from being weakened due to improper length. At the same time, the force is adjusted according to the weight of the object to be lifted to prevent the steel cable 18 from being overloaded. At this time, the end of the lifting block 17 away from the main beam 1 is located outside the sliding sleeve 14, and all the lifting units 7 located near the traveling wheel 21 are in a low position. This ensures that the traveling wheel 21 is in a guiding state before the main beam 1 starts to slide, to avoid deviation during start-up and reduce the swaying of the object to be lifted.

[0052] Step 2: Start the hub drive device 24 to drive the travel wheel 21 to roll, which in turn drives the main beam 1 to slide relative to the travel frame 2. During the travel, the lifting block 17 abuts against the drive column 12 in each lifting unit 7 in the direction of travel, so that each lifting unit 7 is in a low position in sequence.

[0053] Step 3: At the same time, during the driving process, the drive column 12 in each lifting unit 7 that is opposite to the driving direction separates from the lifting block 17 in sequence, so that each lifting unit 7 is reset to the high position in sequence, thereby timely forming a limit protection for the area that has been driven through, preventing the main beam 1 from reversing or rebounding and deviating, and preparing for the next reverse sliding.

[0054] Step 4: When the suspended object deflects due to inertia, the suspended object drives the lifting block 17 to slide vertically upward relative to the sliding sleeve 14 through the steel cable 18; thereby separating each drive column 12 that is in contact with the lifting block 17 from the lifting block 17, thereby resetting the lifting unit 7 that is not in contact with the travel wheel 21 to the high position, while the lifting unit 7 that is in contact with the travel wheel 21 remains in the low position under the action of the travel wheel 21;

[0055] Step 5: When the main beam 1 slides to the set position, the suspended object will inevitably deflect due to inertia. At this time, under the action of the deflection emergency stop device 4, the guide limit device 3 can accurately position the main beam 1.

[0056] The above are the preferred embodiments described in this invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A precise positioning and emergency stop control system for a bridge crane, characterized in that: The system includes a main beam (1), a traveling frame (2), guide and limiting devices (3), and a deflection emergency stop device (4). The two guide and limiting devices (3) are arranged on the traveling frame (2) along its length. The main beam (1) is mounted on the traveling frame (2) and slides with it. Both ends of the main beam (1) are provided with traveling structures (5). The guide and limiting devices (3) are configured to cooperate with the traveling structures (5). A crane trolley (6) slides on the main beam (1). The crane trolley (6) is used to hoist the load. The two deflection emergency stop devices (4) are used to hoist the load. The two sides of the suspended object are connected to the two traveling structures (5) respectively. During normal travel, the guide limiting device (3) and the traveling structure (5) cooperate with each other, so that the guide limiting device (3) guides the sliding of the main beam (1) relative to the traveling frame (2). When the suspended object reaches the deflection limit due to inertia, the deflection emergency stop device (4) can disconnect the cooperation between the traveling structure (5) and the guide limiting device (3), so that the guide limiting device (3) limits the traveling structure (5) and avoids relative movement between the main beam (1) and the traveling frame (2).

2. The bridge crane precision positioning and emergency stop control system according to claim 1, characterized in that: Each of the guide limiting devices (3) includes a plurality of lifting units (7) arranged along the length direction of the travel frame (2) and a plurality of lifting seats (8) that cooperate with the lifting units (7). The travel frame (2) is provided with mating grooves (9) on both sides along the length direction. The plurality of lifting seats (8) are fixedly installed on the bottom surface of the mating grooves (9) along the length direction of the mating grooves (9). Each of the lifting units (7) is respectively installed on each lifting seat (8). The cooperation between the lifting unit (7) and the lifting seat (8) enables the lifting unit (7) to move vertically up and down relative to the lifting seat (8). When the lifting unit (7) moves to the bottommost position relative to the lifting seat (8), the uppermost end of the lifting unit (7) still passes through the mating groove (9) and protrudes from the upper surface of the travel frame (2).

3. The bridge crane precision positioning and emergency stop control system according to claim 2, characterized in that: The two mating grooves (9) are respectively opened on the two long beams along the length direction of the traveling frame (2). The openings of the two mating grooves (9) are both pointing towards the center plane of the traveling frame (2) in the width direction. Each mating groove (9) has a guide opening (26) along the length direction on the upper groove wall in the vertical direction. Several lifting seats (8) are installed on the lower groove wall in the vertical direction of the mating groove (9) corresponding to the guide opening (26). When several lifting units (7) are installed on the lifting seats (8), the upper end of the lifting unit (7) passes through the guide opening (26) and protrudes from the upper surface of the traveling frame (2).

4. The bridge crane precision positioning and emergency stop control system according to claim 3, characterized in that: The lifting unit (7) includes a rectangular column (10), a circular column (11), a drive column (12), and a rotating connector (27); the circular column (11) is rotatably mounted at the center of one side of the rectangular column (10) via the rotating connector (27), and the drive column (12) is vertically connected to the outer circumferential wall of the circular column (11) near the end of the rectangular column (10); the lifting seat (8) includes a mating block, and the mating block has a lifting groove (13) at the center of one side near the lifting unit (7) that can mate with the circular column (11), the lifting groove (13) A lifting structure is provided between the inner circumferential wall of the circular column (11) and the outer circumferential wall of the circular column (11) away from the rectangular column (10); in the assembled state, the end of the rectangular column (10) away from the circular column (11) passes through the guide port (26) and protrudes from the upper surface of the traveling frame (2), and the end of the driving column (12) away from the circular column (11) passes through the groove of the mating groove (9) and is outside the mating groove (9). The lifting structure can drive the circular column (11) to rise or fall vertically relative to the lifting groove (13), so that the lifting unit (7) is in a high position or a low position.

5. The bridge crane precision positioning and emergency stop control system according to claim 4, characterized in that: The lifting structure includes a ball groove (15) on the inner circumferential wall of the lifting groove (13) and an embedded groove (16) on the outer circumferential surface of the circular column (11) away from the rectangular column (10). The ball groove (15) includes a highest point and two lowest points, which are distributed on both sides of the highest point and coincide with the two ends of the ball groove (15). A ball (19) is rolled in the ball groove (15). Compression springs (20) are provided at both ends of the ball groove (15). The two compression springs (20) extend along the contour of the ball groove (15), and the ends of the two compression springs (20) that are close to each other abut against the two sides of the ball (19). The ball (19) protrudes out of the ball groove (15). Part of the rolling fit is in the embedded groove (16); in the initial state, the ball (19) is located at the highest point of the ball groove (15) under the action of the two compression springs (20); when the main beam (1) slides relative to the traveling frame (2), the traveling structure (5) can contact the drive column (12) and drive the circular column (11) to rotate along its own axis. The rolling fit between the ball groove (15) and the ball (19) can make the circular column (11) move vertically downward relative to the mating block with the rectangular block (10). When the traveling structure (5) separates from the drive column (12), the compression spring (20) can drive the ball (19) to roll back in the ball groove (15), so that the circular column (11) is reset vertically upward relative to the mating block.

6. The bridge crane precision positioning and emergency stop control system according to claim 1, characterized in that: The driving structure (5) includes a driving wheel (21), a mating structure (22), a mounting beam (23), and a hub drive device (24). The mounting beam (23) is vertically installed at both ends of the main beam (1). The driving wheel (21) is rolled on the mounting beam (23). The mating structure (22) is installed on the side of the mounting beam (23) close to the main beam (1) corresponding to the driving wheel (21). In the assembled state, the mating structure (22) is located at the opening of the mating groove (9). The drive columns (12) of multiple lifting units (7) simultaneously abut against the side of the mating structure (22) away from the main beam (1), thereby making the lifting unit (7) located near the driving wheel (21) in a low position.

7. A bridge crane precision positioning and emergency stop control system according to claim 6, characterized in that: On the circumference of the driving wheel (21), there are limit grooves (30) corresponding to the rectangular column (10). In the low position, the uppermost end face of the rectangular column (10) is tangentially fitted to the circumferential surface of the bottom of the limit groove (30) of the driving wheel (21), and the upper ends of the two side walls of the rectangular column (10) are respectively in contact with the two groove walls of the limit groove (30) of the driving wheel (21). In the high position, the uppermost end face of the rectangular column (10) is higher than the axis of the driving wheel (21) in the vertical direction, and the two rectangular columns (10) on both sides of the driving wheel (21) are embedded in the limit groove (30) near the side wall of the driving wheel (21).

8. A bridge crane precision positioning and emergency stop control system according to claim 6, characterized in that: The mating structure (22) includes a rectangular sliding sleeve (14), a rectangular lifting block (17), and a steel cable (18). The sliding sleeve (14) is installed on the side of the mounting beam (23) near the main beam (1), and the lowest end of the sliding sleeve (14) is higher than the upper surface of the drive column (12) in the lifting unit (7) in the high position in the vertical direction. The lifting block (17) is slidably fitted inside the sliding sleeve (14). A connection port (29) is opened on the side wall of the sliding sleeve (14) near the main beam (1) and near the lifting trolley (6). One end of the steel cable (18) is fixedly connected to the lifting block (17). The other end passes through the connection port (29) and is connected to one side of the suspended item. During normal operation, the end of the lifting block (17) away from the main beam (1) is located outside the sliding sleeve (14) and simultaneously abuts against the drive column (12) of multiple lifting units (7), thereby placing each of the above-mentioned lifting units (7) in a low position. When the suspended item reaches the deflection limit, the lifting block (17) is separated from the drive column (12) of each of the above-mentioned lifting units (7) under the action of the steel rope (18), thereby resetting each of the above-mentioned multiple lifting units (7) that is not in contact with the driving wheel (21) to a high position.

9. A bridge crane precision positioning and emergency stop control system according to claim 8, characterized in that: The cooperating structure (22) also includes an electric retrieval device. The lifting block (17) has a cable machine installation space. The electric retrieval device is fixedly installed in the cable machine installation space. One end of the steel rope (18) is fixed to the electric retrieval device, and the other end passes through the connection port (29) and is connected to one side of the suspended item. The electric retrieval device can adjust the length of the steel rope (18) according to the hoisting requirements and the hoisting process.

10. The working method of the bridge crane precision positioning and emergency stop control system according to claim 9, characterized in that: Includes the following steps Step 1: The object to be lifted is hoisted below the trolley (6), and the electric retrieval device adjusts the length of the steel rope (18) according to the hoisting requirements; at this time, the end of the lifting block (17) away from the main beam (1) is located outside the sliding sleeve (14), and each of the lifting units (7) near the traveling wheel (21) is in a low position. Step 2: Start the hub drive device (24) to drive the driving wheel (21) to roll, and drive the main beam (1) to slide relative to the driving frame (2). During the driving process, the lifting block (17) abuts against the drive column (12) in each lifting unit (7) in the direction of travel, so that each lifting unit (7) is in a low position in sequence. Step 3: At the same time, during the driving process, the drive column (12) in each lifting unit (7) that is opposite to the driving direction separates from the lifting block (17) in turn, so that each lifting unit (7) is reset to the high position in turn; Step 4: When the suspended object deflects due to inertia, the suspended object drives the lifting block (17) to slide vertically upward relative to the sliding sleeve (14) through the steel rope (18); thereby separating the driving column (12) that is in contact with the lifting block (17) from the lifting block (17), thereby resetting the lifting unit (7) that is not in contact with the travel wheel (21) in each of the above-mentioned driving column (12) to the high position, while the lifting unit (7) that is in contact with the travel wheel (21) remains in the low position under the action of the travel wheel (21); Step 5: When the main beam (1) slides to the set position, the suspended item will inevitably deflect due to inertia. At this time, under the action of the deflection emergency stop device (4), the guide limit device (3) can accurately position the main beam (1).

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