Lifting protection system of double-trolley bridge crane with lifting mode

Abstract

The utility model provides a lifting protection system of a double-trolley bridge crane with a lifting mode. The lifting protection system comprises a main lifting height monitoring device, an auxiliary lifting height monitoring device, a control device, a main lifting mechanism for driving a main trolley lifting hook to move up and down and an auxiliary lifting mechanism for driving an auxiliary trolley lifting hook to move up and down, the control device is used for comparing the received absolute value of H3-H4 with the allowable deviation of the lifting height, and when the absolute value of H3-H4 is larger than the allowable deviation, a lifting control instruction is sent to the main lifting mechanism or the auxiliary lifting mechanism; and the main lifting mechanism or the auxiliary lifting mechanism executes the lifting control instruction to drive the lifting hook with high lifting or descending speed to decelerate or drive the lifting hook with low lifting or descending speed to accelerate. In the lifting mode, the lifting monitoring device is adopted, the lifted object is prevented from inclining by controlling the height difference of the lifting hooks of the main trolley and the auxiliary trolley, the safety coefficient is higher, and the lifting equipment and the lifted object can be effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy engineering machinery, in particular to a lifting protection system of a double-trolley bridge crane with a lifting mode. Background Art

[0002] When a double-trolley bridge crane with lifting mode is performing lifting operations, the following protection measures are usually adopted to ensure the safety and efficiency of the operation: During the lifting process, ensure that the loads of the two cranes are evenly distributed to avoid imbalance or overturning of the cranes due to uneven loads. Ensure that the cranes are equipped with necessary safety devices, such as height limiters, torque limiters, anti-unhooking devices, etc., to prevent accidents such as overwinding, overloading, and accidental unhooking of the slings.

[0003] Through the comprehensive application of the above measures, the operation safety of the double trolley bridge crane in the lifting mode can be effectively protected and the risk of accidents can be reduced. However, it is not enough to ensure the safety of the lifting equipment and the hoisted objects of the double trolley bridge crane with lifting mode during the lifting operation. Utility Model Content

[0004] The utility model provides a lifting protection system of a double-trolley bridge crane with a lifting mode to solve at least one of the above problems.

[0005] According to one aspect of the utility model, a lifting protection system of a double-trolley bridge crane with a lifting mode is provided. The double-trolley bridge crane includes a main trolley and an auxiliary trolley, and is characterized in that it includes: a main lifting height monitoring device, an auxiliary lifting height monitoring device and a control device, as well as a main lifting mechanism for driving the main trolley hook to move up and down and an auxiliary lifting mechanism for driving the auxiliary trolley hook to move up and down; the main lifting height monitoring device is used to monitor the lifting height of the main trolley hook in real time, and output the measured lifting height value H3 of the main trolley hook to the control device. Device; the auxiliary lifting height monitoring device is used to monitor the lifting height of the auxiliary trolley hook in real time, and output the measured lifting height value H4 of the auxiliary trolley hook to the control device; the control device is used to compare the received absolute value of H3-H4 with the allowable deviation of the lifting height. If the absolute value of H3-H4 is greater than the allowable deviation, a lifting control instruction is issued to the main lifting mechanism or the auxiliary lifting mechanism; the main lifting mechanism or the auxiliary lifting mechanism executes the lifting control instruction, drives the hook with a fast lifting or lowering speed to decelerate, or drives the hook with a slow lifting or lowering speed to accelerate.

[0006] The utility model discloses a lifting protection system for a double-trolley bridge crane with a lifting mode. In the lifting mode, a lifting height monitoring device is adopted to prevent the hoisted objects from tilting by controlling the height difference between the main trolley and the auxiliary trolley hooks. The safety factor is higher, and the lifting equipment and the hoisted objects can be effectively protected.

[0007] In some embodiments, the utility model further comprises a main load sensor and a secondary load sensor; the main load sensor is used to monitor the lifting load of the main trolley in real time, and output the measured lifting load value G1 of the main trolley to the control device; the secondary load sensor is used to monitor the lifting load of the main trolley in real time, and output the measured lifting load value G2 of the secondary trolley to the control device; the control device is used to compare the received G1 with the rated load of the main trolley, and if G1 is greater than the rated load of the main trolley, a main stop control instruction is issued to the main lifting mechanism; the control device is also used to The control device is used to compare the received G2 with the rated load of the auxiliary trolley. If G2 is greater than the rated load of the auxiliary trolley, a secondary stop control command is issued to the auxiliary lifting mechanism. The control device is also used to compare the received G1+G2 with the rated load of the crane. If G1+G2 is greater than the rated load of the crane, a main stop control command is issued to the main lifting mechanism and a secondary stop control command is issued to the auxiliary lifting mechanism at the same time. The main lifting mechanism executes the main stop control command to stop lifting the main trolley hook; the auxiliary lifting mechanism executes the secondary stop control command to stop lifting the auxiliary trolley hook. The use of load sensors to monitor the loads of both the main trolley and the auxiliary trolley at the same time, and whether the sum of the two exceeds the rated load of the crane, has a higher safety factor.

[0008] In some embodiments, the main lifting mechanism of the utility model includes a main lifting motor, and the auxiliary lifting mechanism includes an auxiliary lifting motor; the control device is used to control the speed ratio of the main lifting motor and the auxiliary lifting motor, so that the lifting speeds of the main trolley hook and the auxiliary trolley hook are consistent. During the lifting process, the lifting speed of the main and auxiliary trolley hooks is maintained within the error range, which can prevent the hoisted objects from tilting and causing safety hazards.

[0009] In some embodiments, the utility model further includes a main displacement detection device and a secondary displacement detection device, as well as a main walking mechanism for driving the main trolley and a secondary walking mechanism for driving the secondary trolley; the main displacement detection device is used to monitor the walking distance of the main trolley and output the detected displacement value S1 to the control device; the secondary displacement detection device is used to monitor the walking distance of the secondary trolley and output the detected displacement value S2 to the control device; the control device is used to compare the received absolute value of S1-S2 with the allowable deviation of the walking distance, and if the absolute value of S1-S2 is greater than the allowable deviation, a walking control instruction is issued to the main walking mechanism or the secondary walking mechanism; the main walking mechanism or the secondary walking mechanism executes the walking control instruction, driving the fast trolley to slow down or controlling the slow trolley to accelerate. During the lifting and walking process, maintaining the lifting point distance of the hooks of the main and secondary trolleys within the error range can prevent safety hazards caused by excessive deflection of the wire rope.

[0010] In some embodiments, the main walking mechanism of the utility model includes a main walking motor, and the auxiliary walking mechanism includes an auxiliary walking motor; the control device is used to control the speed ratio of the main walking motor and the auxiliary walking motor to make the walking speeds of the main trolley and the auxiliary trolley consistent.

[0011] In some embodiments, the utility model further comprises a swing reduction device for the hook group; the swing reduction device comprises a telescopic rod and a plurality of displacement sensors, a control device and a driving device; the lower end of the telescopic rod is arranged on the top of the hanging plate of the hook group, and the upper part is mounted on the telescopic rod mounting seat through a spherical roller bearing; the telescopic rod mounting seat is arranged on the trolley frame of the bridge crane; the displacement sensor is arranged on the trolley frame of the bridge crane, and is evenly arranged on the circumference with the telescopic rod as the center, for detecting the position of the telescopic rod, and outputting the displacement data of the telescopic rod to the control device; the control device is used to determine the swing direction of the hook group according to the received plurality of displacement data, and output a driving instruction to the driving device; the driving device executes the driving instruction to drive the trolley or car of the bridge crane to decelerate or accelerate. The swing reduction device monitors the swing amplitude of the hook group through a plurality of displacement sensors, and the control device controls the driving device of the trolley or car in the corresponding direction to decelerate or accelerate according to the swing amplitude of the hook group, so as to reduce the swing of the hook group.

[0012] In some embodiments, the telescopic rod of the utility model includes a plurality of telescopic joints sleeved from the outside to the inside, the outermost telescopic joint includes an upper pressure plate, a steel pipe and a lower pressure plate, and each internal telescopic joint includes an upper pressure plate, a sliding bearing, a connecting shaft, a steel pipe and a lower pressure plate arranged in sequence from top to bottom; on the same telescopic joint, the steel pipe is fixedly connected to the lower end of the connecting shaft, the sliding bearing is sleeved outside the connecting shaft, and the upper pressure plate is connected to the upper end of the connecting shaft; the outer diameter of the sliding bearing is larger than the outer diameter of the steel pipe; the outer diameter of the upper pressure plate is smaller than the outer diameter of the sliding bearing and larger than the inner diameter of the sliding bearing; the inner diameter of the lower pressure plate is consistent with the inner diameter of the steel pipe; the lower part of the lower pressure plate is connected to a flange ring, the inner diameter of the flange ring is larger than the outer diameter of the steel pipe of the adjacent inner telescopic joint, and smaller than the outer diameter of the sliding bearing of the adjacent inner telescopic joint.

[0013] In some embodiments, there is a gap between adjacent expansion joints of the utility model, and the gap between the sliding bearing on the inner expansion joint and its adjacent outer expansion joint is smaller than the gap between the steel pipes. When the inner expansion joint is eccentric or the hook is deflected, the sliding bearing slides in the steel pipe of the adjacent outer expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model;

[0015] Figure 2It is a partial structural schematic diagram of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model;

[0016] Figure 3 It is a schematic structural diagram of a main hook, a movable pulley block, a fixed pulley block and a balance wheel, and the winding of a steel wire rope of a double trolley bridge crane with a lifting mode according to an embodiment of the utility model;

[0017] Figure 4 for Figure 3 The schematic diagram of the winding of the wire rope of the hoisting device of the bridge crane on the main hook group and the movable pulley group, the fixed pulley group and the balance wheel is shown;

[0018] Figure 5 A schematic diagram of an anti-top impact and guide structure of a lifting protection system of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model;

[0019] Figure 6 for Figure 5 The schematic diagram of the anti-collision top and the guide structure shown;

[0020] Figure 7 for Figure 6 The schematic diagram of the installation structure of the guide plate shown;

[0021] Figure 8 for Figure 6 Schematic diagram of the precise guidance and anti-top impact structure shown;

[0022] Fig. 9 It is a schematic diagram of the principle of a hook swing reduction structure of a lifting protection system of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model;

[0023] Fig.10 , Fig.11 and Fig.12 It is a schematic diagram of a hook group swing reduction structure of a lifting protection system of a double-trolley bridge crane with a lifting mode according to another embodiment of the utility model;

[0024] Fig.13 It is a flow chart of a lifting height protection method of a lifting protection system of a double trolley bridge crane with a lifting mode according to an embodiment of the utility model;

[0025] Fig.14 It is a flow chart of a load protection method of a lifting protection system of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model;

[0026] Fig.15 A schematic flow chart of a trolley travel distance protection method of a lifting protection system of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model;

[0027] Figure 16-18 The present invention is a schematic diagram of the frame structure of the main trolley of a double-trolley bridge crane according to one embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0030] Finally, it should be noted that, in this article, relational terms such as first and second, counterclockwise and clockwise, forward and reverse are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include" and "comprise" include not only those elements, but also other elements not explicitly listed, or also include elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device that includes the elements.

[0031] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0032] Figure 1-4 The structure of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model is schematically shown.

[0033] refer to Figure 1-4 As shown, the bridge crane can be used to lift large-tonnage and large-volume objects, and includes a trolley traveling mechanism 21 and two trolley traveling mechanisms 22 (including a main trolley 221 and an auxiliary trolley 222).

[0034] The trolley travel mechanism 21 is in the shape of a rectangular frame as a whole, and includes two parallel bridge frames 211 and end beams 212 connecting the two ends of the bridge frames 211. The two ends of the bridge frames 211 are slidably connected to the first track 111 set on the rock anchor beam. Travel rollers are set at the bottom of the two ends of the bridge frame 211 of the trolley travel mechanism 21. The travel rollers are driven by a motor, and the trolley travel mechanism 21 as a whole can reciprocate along the first track 111.

[0035] The auxiliary trolley 222 is in the shape of a rectangular frame as a whole, and includes two parallel first main beams 251 and second main beams 252, and two auxiliary beams 254 respectively connecting the first main beams 251 and second main beams 252 at both ends. The main trolley 221 has an additional support beam 253 parallel to the first main beam 251 and second main beam 252 on the basis of the auxiliary trolley 222. The main trolley 221 and the auxiliary trolley 222 are slidably connected to two bridge frames 211 at both ends, and the bridge frame 211 is provided with a second track 112, and the lower part of the auxiliary beam 254 is provided with rollers adapted to the second track 112. The rollers of the main trolley 221 and the auxiliary trolley 222 are respectively driven by motors, and the main trolley 221 and the auxiliary trolley 222 can respectively move back and forth along the bridge frame 211 of the trolley walking mechanism 21.

[0036] An auxiliary winch drum 233 (hereinafter referred to as auxiliary drum 233 ) is provided on the first main beam 251 of the auxiliary trolley 222 . The auxiliary winch is used to drive the auxiliary hook 263 to move up and down. The rated load of the auxiliary hook 263 is 100 tons.

[0037] A main winch drum 231 (hereinafter referred to as main drum 231) is provided on the first main beam 251 of the main trolley 221. Two fixed pulley blocks 241 include a left fixed pulley block 2411 and a right fixed pulley block 2412. The pulley shaft directions of the left fixed pulley block 2411, the right fixed pulley block 2412 and the balance wheel 243 are perpendicular to the first main beam 251 and the second main beam 252. The two ends of the support of the left fixed pulley block 2411, the right fixed pulley block 2412 and the balance wheel 243 are respectively supported above the first main beam 251 and the second main beam 252. The main hook block includes a left movable pulley block 2421, a right movable pulley block 2422, a hanging plate 270 and a main hook 261. The main hook 261 of the main trolley 221 is connected to two movable pulley blocks 242 (left movable pulley block 2421 and right movable pulley block 2422) through a hanging plate 270. The rated load of the main hook 261 is 200 tons. The small winch drum 232 is arranged above the support beam 253. The small winch is used to drive the small hook 262 to move up and down. The small hook 262 is located below the support beam 253 and has a rated load of 25 tons.

[0038] Both trolleys 22 are provided with anti-collision devices 352, limit devices 351 and trolley stop posts 361. The electric control cabinet is arranged on the bridge, the left bridge is provided with a left power supply cable 301, the right bridge is provided with a right power supply cable 302, and the main trolley and the auxiliary trolley are provided with terminal boxes 303 respectively.

[0039] refer to Figure 2 As shown, the left and right movable pulley blocks of the main hook group are respectively located below the left and right fixed pulley blocks, and between the first main beam 251 and the second main beam 252 of the trolley frame. The maximum dimension B of the hanging plate 270 of the main hook group perpendicular to the direction of the first main beam 251 is smaller than the minimum distance Ax between the first main beam 251 and the second main beam 252. During the lifting process of the main hook group, the hanging plate 270 will rise to the position between the first main beam 251 and the second main beam 252.

[0040] refer to Figure 3 and 6 As shown, the two ends of the wire rope 271 of the main hoist drum 231 are respectively fixed to the two ends of the main hoist drum 231, and the middle of the wire rope 271 is hung on the balance wheel 243 as the balance wheel section 543. The left section of the wire rope 271 includes the left winding section 541 bypassing the left section of the main hoist drum, the left fixed pulley section 511 bypassing the left fixed pulley block 2411, and the left movable pulley section 521 bypassing the left movable pulley block 2421; the right section of the wire rope 271 includes the right movable pulley section 522 bypassing the right movable pulley block 2422, the right fixed pulley section 512 bypassing the right fixed pulley block 2412, and the right winding section 542 bypassing the right section of the main hoist drum. In this embodiment, each movable pulley block 242 has three movable pulleys, and each fixed pulley block 241 has three fixed pulleys, so the wire rope is wound three times between the fixed pulley block 241 and the movable pulley block 242 on the same side.

[0041] refer to Figure 2 As shown, when the main hook 261 is pulled and lifted to the upper limit 2611 by the main winch, the hanging plate 270 is located between the first main beam 251 and the second main beam 252, and the upper limit 2611 of the main hook 261 is located above the track surface of the first track 111. The height difference between the upper limit 2611 of the main hook 261 and the track surface of the first track 111 is D. In this embodiment, the height difference D is 200 mm.

[0042] The trolley of a traditional bridge crane adopts a main beam, and the fixed pulley block and the hook are located below the main beam, so the operating space of the hook can only be below the main beam, and in order to achieve sufficient strength, the height of the main beam will be made relatively large, so that a large space is required above the bridge frame of the bridge crane for the trolley to operate, and there is more space below the bridge frame that is non-hoisting space, and the lifting height of the hook is relatively low. The trolley frame of the utility model adopts a double main beam structure, which reduces the height of the main beam while ensuring the strength of the main beam, which can reduce the space above the bridge frame 211 for the trolley to operate, and also make the space between the two main beams become the operating space of the movable pulley block 242, so that the upper limit 2611 of the main hook 261 can be located above the track surface of the first track 111, and the lifting height of the main hook 261 is increased.

[0043] Figure 5-10 The hook group guide and anti-top impact structure of the lifting protection system of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model is schematically shown.

[0044] refer to Figure 6-9 As shown, a guide plate 323 is provided on the opposite side of the first main beam 251 and the second main beam 252, and the guide plate 323 includes a guide web 3231 and a wing plate 3232. One side of the guide web is welded to the lower part of the opposite side of the first main beam 251 and the second main beam 252, and the other side is an inclined surface, and the wing plate is welded. The distance Az of the upper ends of the left and right wing plates is smaller than the distance Ad of the lower ends, Az is smaller than the maximum distance B of the outer sides of the two hanging plates 270, and Ad is larger than the outer distance B of the two hanging plates 270.

[0045] refer to Figure 5 As shown, the hoisting motor and the reducer 244 drive the main hoist drum 231 to rotate, and the main drum 231 lifts the main hook group upward by winding the wire rope. When the main hook group is lifted up to a suitable distance from the bottom of the frame of the main trolley, a deceleration signal is sent to the control system through the height sensor. After receiving the deceleration signal, the control system reduces the input frequency of the hoisting motor to make the main hook group continue to rise at a low speed. When the hanging plate 270 enters the area between the first main beam 251 and the second main beam 252, due to the obstruction of the guide plates 323 on the left and right sides, the hanging plate 270 equipped with two sets of movable pulleys 242 and the main hook 261 gradually moves to the middle of the first main beam 251 and the second main beam 252 during the rising process, which can also prevent the main hook group from colliding with the trolley frame.

[0046] The traditional small car frame main beam adopts a single main beam variable cross-section design to solve the problem of large stress caused by the large bending moment in the middle of the main beam, and a large height cross-section is used accordingly. Figure 7As shown, in the utility model, due to the limitation of the tunnel height, the main hook main beam of the trolley frame in the utility model adopts a double main beam design with an equal cross-section and a height equal to the side beam, which can greatly reduce the height of the trolley without reducing the strength of the trolley main beam. The trolley frame includes a first main beam 251 and a second main beam 252 arranged in parallel, and two auxiliary beams 254 arranged in parallel and connecting the two ends of the first main beam 251 and the second main beam 252.

[0047] refer to Figure 8 As shown, the guide and anti-collision device 32 also includes a balance wheel support 53, a travel switch 321, a guide rod 322 and a guide sleeve 324. The guide sleeve 324 is provided on the top of the hanging plate 270. The guide rod 322 is inserted into the shaft hole of the balance wheel support 53. A pressure plate 3211 is welded to the upper end of the guide rod 322. The guide rod 322 is slidably connected to the shaft hole. The guide sleeve 324 is connected to the hanging plate 270 by bolts. When the hook group is further lifted, the guide sleeve 324 installed on the hanging plate 270 gradually approaches the guide rod 322. The guide rod 322 is inserted into the guide sleeve 324, and the hanging plate 270 of the hook group in the lifting process is further guided to the middle of the first main beam 251 and the second main beam 252.

[0048] A pressure plate 3211 is welded to the upper end of the guide rod 322. When the hook assembly has not yet risen to the height of the main beam of the trolley frame, the pressure plate 3211 on the guide rod 322 presses the contact of the travel switch 321. When the hook assembly drives the guide sleeve 324 to lift upward, the guide rod 322 is inserted into the guide sleeve 324. The hook assembly continues to lift to move the guide rod 322 upward, so that the pressure plate 322 leaves the contact of the travel switch 321. At this time, the control system will cut off the circuit for lifting the hook assembly to prevent the hook assembly from further lifting and causing safety hazards.

[0049] A camera 31 is also installed below the balance wheel support 53, and the state of the hook group can be monitored through a visualization system. The control system compares the real-time state diagram of the hook group captured by the camera 31 with the pre-stored normal state diagram of the hook group to determine whether it is necessary to cut off the circuit for the hook lifting. Through the video data collected by the camera 31, the system can sense whether the hook group enters the gap between the first main beam 251 and the second main beam 252 of the trolley, and after comparing it with the standard picture (a safe state picture that conforms to normal operation), if the comparison passes, it means that the hook group is in a normal state and the hook group continues to rise; if the comparison fails, it means that the hook group is in an abnormal state, then the control system outputs a signal to stop the hook group from rising, and controls the hook group to stop rising to ensure the safety of the operation.

[0050] Fig. 9 The hook group sway reduction structure and principle of the lifting protection system of a double-trolley bridge crane with a lifting mode according to an embodiment of the utility model are schematically shown.

[0051] refer to Fig. 9 As shown, both the fixed pulley group 241 and the movable pulley group 242 are arranged in two groups. With this structure, the principle is similar to that of two groups of pulley groups lifting hooks and heavy objects. When the heavy object does not swing, the distance between the left fixed pulley group 2411 and the left movable pulley group 2421 is equal to the distance between the right fixed pulley group 2412 and the right movable pulley group 2422, both of which are H1. Assuming that the trolley starts to move backward or accelerate, due to inertia and the steel wire rope 271 being a flexible element, after the steel wire rope deflects, an angle α is generated with respect to the original vertical state. At this time, the left movable pulley block 2421 and the right movable pulley block 2422, which were originally at the same height, will have a height difference, that is, the originally horizontal axis connecting line OA of the left movable pulley block 2421 and the right movable pulley block 2422 rotates around point O to OB, so that the distance H2 between the right fixed pulley block 2412 and the right movable pulley block 2422 is greater than the distance H1 between the left fixed pulley block 2411 and the left movable pulley block 2421, that is, there is an angle β between OA and OB. Since the steel wire ropes on the left and right sides of the balance wheel 234 are the same steel wire rope, refer to Figure 4 As shown, the lengths of both sides are kept equal through the balance wheel 243 in the middle. The friction between the wire rope 271 and the fixed pulley group 241 and the movable pulley group 242 and the balancing effect of the balance wheel 243 can prevent the phenomenon that H2 is greater than or less than H1. Therefore, this structural design can reduce the swing of the hook group on the trolley during the movement of the trolley walking mechanism 21.

[0052] The larger the installation spacing S between the two fixed pulley blocks, the greater the height difference between H2 and H1. Therefore, by increasing the installation spacing S value between the two fixed pulley blocks and using a multi-rate pulley block, the swing reduction effect can be better.

[0053] Figure 10-12 The figure schematically shows a hook group sway reduction structure of a lifting protection system of a double-trolley bridge crane with a lifting mode according to another embodiment of the utility model.

[0054] refer to Figure 10-12 As shown, the hook group sway reduction structure includes a telescopic rod 348 arranged on the top of the hanging plate 270 of the hook group, and four displacement sensors 340 for detecting the position of the telescopic rod. The lower end of the telescopic rod 348 is connected to the hanging plate 270, and the middle part is installed on the telescopic rod mounting seat 343 through a spherical roller bearing 345. The telescopic rod mounting seat 343 is connected to the first main beam 251 and the second main beam 252 of the trolley (main trolley and auxiliary trolley), and can also be installed on the balance wheel support 53. The telescopic rod 348 can be retracted as the hook group is raised, or extended as the hook group is lowered.

[0055] Four displacement sensors 340 are installed below the balance wheel support 53, evenly distributed on a circle with the telescopic rod 348 as the center, and one is arranged in each of the front, back, left, and right running directions of the crane trolley running mechanism and the trolley running mechanism, for detecting the displacement of the telescopic rod 348 in four directions. The displacement sensor 340 can be a device such as a proximity switch that can be used to detect the displacement of an object. In this embodiment, four displacement sensors 340 are used. In other embodiments, the number of displacement sensors 340 can also be set to three or six or other numbers as needed.

[0056] The displacement sensor 340 outputs the displacement data of the telescopic rod to the control device.

[0057] The control device 300 is used to determine the swing direction of the hook assembly according to the received displacement data and output a driving instruction to the driving device.

[0058] The driving device executes the driving instruction to drive the trolley or carriage of the bridge crane to decelerate or accelerate. The driving device can be a device such as an electric motor that can drive the trolley or carriage to move.

[0059] The telescopic rod 348 is composed of four telescopic sections (3481, 3482, 3483, 3484) arranged from outside to inside, the first telescopic section 3481 at the outermost side includes an upper pressing plate 342, a steel pipe 346 and a lower pressing plate 341 connected in sequence from top to bottom, and each of the second telescopic section 3482, the third telescopic section 3483 and the fourth telescopic section 3484 is provided with an upper pressing plate 342, a sliding bearing 349, a connecting shaft 347, a steel pipe 346 and a lower pressing plate 341 in sequence from top to bottom. The steel pipe 346 can be a seamless steel pipe.

[0060] On the same expansion joint, the steel pipe 346 is fixedly connected to the lower end of the connecting shaft 347, the sliding bearing 349 is sleeved outside the connecting shaft 347, and the upper pressing plate 342 is connected to the upper end of the connecting shaft 347. The outer diameter of the upper pressing plate 342 is smaller than the outer diameter of the sliding bearing 349 and larger than the inner diameter of the sliding bearing 349. The inner diameter of the lower pressing plate 341 is consistent with the inner diameter of the steel pipe 346.

[0061] There is a gap of 2-3 mm between adjacent telescopic sections, and a gap of 1-2 mm between the sliding bearing 349 and the adjacent external telescopic section. When the inner telescopic section is eccentric or the hook group is deflected, the sliding bearing 349 slides in the steel pipe of the adjacent external telescopic section, reducing the sliding friction and the processing cost. A lower pressure plate 341 is provided at the bottom of each telescopic section, and the lower pressure plate 341 of the innermost telescopic section is connected to the bottom of the hanging plate by bolts.

[0062] The lower part of the lower pressing plate 341 of the first telescopic joint 3481, the second telescopic joint 3482 and the third telescopic joint 3483 is connected with a flange ring 3411. The inner diameter of the flange ring 3411 is larger than the outer diameter of the steel pipe 346 of the adjacent inner telescopic joint, and smaller than the outer diameter of the sliding bearing of the adjacent inner telescopic joint. The flange ring 3411 can prevent the adjacent telescopic joints from falling out.

[0063] A telescopic rod shaft 344 is welded to the outside of the steel pipe 346 of the first telescopic joint 3481 on the outermost side. The telescopic rod shaft 344 is mounted on the telescopic rod mounting seat 343 through a spherical roller bearing 345 .

[0064] When the hook group swings, since the lower end of the telescopic rod 348 is connected to the hanging plate 270 of the hook group by bolts, and the middle part of the telescopic rod 348 is fixed to the telescopic rod mounting seat 343 by the spherical roller bearing 348, the telescopic rod 348 can swing with the hook group. After swinging, the telescopic rod 348 swings to one side and the distance from the displacement sensor 340 becomes smaller. The displacement sensor 340 arranged on this side sends a sensing signal to the control system, and the control device controls the walking mechanism to decelerate in the opposite direction or accelerate in the same direction. For example, when the crane starts to move forward, due to inertia, the hook group swings backward, and the telescopic rod 348 generates a backward swing angle. The displacement sensor 340 located on the rear side senses the telescopic rod 348 and sends a signal. After the control system receives the signal, the control device controls the walking mechanism to decelerate forward or accelerate backward. The displacement sensor 340 can be a device such as a proximity switch that can be used to detect the displacement of an object.

[0065] For example, when the displacement sensor 340 detects that the telescopic rod 348 moves backward, the displacement sensor 340 outputs the displacement data of the telescopic rod to the control device 300, and the control device determines that the hook group swings backward, indicating that the forward speed of the trolley travel mechanism 21 is too fast. The control device outputs a deceleration control instruction to the driving device of the trolley travel mechanism 21, and the driving device of the trolley travel mechanism 21 drives the trolley travel mechanism 21 to decelerate, and the amplitude of the backward swing of the hook group will be reduced. If the displacement sensor 340 detects that the telescopic rod 348 moves to the left or right, the swing of the hook group can be reduced by controlling the trolley travel mechanism 22 to decelerate or accelerate.

[0066] In this embodiment, the telescopic rod 348 has an outer diameter of 200 mm and is composed of four telescopic sections. The tail is equipped with a sliding mechanism. The gap between the inner and outer sections in the full length direction is small (2mm to 3mm). It is a rigid-flexible structure with a large slenderness ratio and can withstand a certain bending moment and lateral force. When the hook group or the weight swings, the telescopic rod 348 produces elastic deformation and forms a reverse force, which can prevent the hook group or the weight from swinging, thereby reducing the swing of the hook group. In other embodiments, the number of telescopic sections can be adjusted according to the lifting height of the hook group.

[0067] The utility model has a lifting mode, that is, the main hook of the main trolley (referred to as the main hook 261) and the hook of the auxiliary trolley (referred to as the auxiliary hook 263) lift the same object at the same time. In order to ensure the safe operation of the lifting mode, a lifting protection system is set, which includes a main trolley load sensor, an auxiliary trolley load sensor, a main trolley wheel encoder, an auxiliary trolley wheel encoder, a main trolley hook group height detection device and an auxiliary trolley hook group height detection device.

[0068] The lifting protection system of a double trolley bridge crane with lifting mode includes lifting protection method and walking protection method. The lifting protection method includes load protection method, lifting speed protection method and lifting height protection method, and the walking protection method includes lifting point distance protection method and walking speed protection method. In actual working conditions, one or a combination of more than one of these protection methods can be used.

[0069] The main trolley load sensor is used to detect the load of the main trolley hook, the auxiliary trolley load sensor is used to detect the load of the auxiliary trolley hook, the main trolley wheel encoder is used to detect the traveling distance of the main trolley, the auxiliary trolley wheel encoder is used to detect the traveling distance of the auxiliary trolley, the main trolley height detection device is used to detect the lifting height of the main trolley hook, and the auxiliary trolley height detection device is used to detect the lifting height of the auxiliary trolley hook.

[0070] The utility model utilizes the above detection device and other measuring tools, and through the control of the control device, the following method can be used to protect the lifting operation of the double trolley bridge crane.

[0071] Fig.13 The flow of the lifting height protection method of the lifting protection system of the double trolley bridge crane with lifting mode according to an embodiment of the utility model is schematically shown. The lifting height protection method includes real-time monitoring of the height H3 of the main hook 261 of the main trolley and the height H4 of the auxiliary trolley hook 263.

[0072] When the absolute value of H3-H4 is greater than the height system allowable deviation, the hook with a fast lifting or lowering speed is controlled to decelerate or the hook with a slow lifting or lowering speed is controlled to accelerate. In the present embodiment, the absolute value of H3-H4 is greater than the height system allowable deviation of 10 mm.

[0073] Angle sensors 33 are respectively arranged beside the drums of the hoisting devices of the main and auxiliary trolleys. Fig.13As shown, two angle sensors respectively monitor the number of rotations (n3, n4) of the reels of the main and auxiliary trolleys in real time. The angle sensors of the main and auxiliary trolleys output 4-20 mA analog quantities to the control device 300. The control device respectively calculates the lifting heights (H3, H4) of the hooks of the main and auxiliary trolleys, and then calculates the absolute value of H3-H4. The control device compares the absolute value of H3-H4 with the allowable deviation of the lifting height of the system. If the absolute value of H3-H4 is greater than the allowable deviation of the lifting height of the system, the control device sends a lifting control instruction to the main lifting mechanism or the auxiliary lifting mechanism. The main lifting mechanism or the auxiliary lifting mechanism executes the lifting control instruction, driving the hook with a fast lifting or lowering speed to decelerate or driving the hook with a slow lifting or lowering speed to accelerate. If the absolute value of H3-H4 is less than the allowable deviation of the system, the hooks of the main and auxiliary trolleys of the control device 300 continue to lift or lower.

[0074] The main lifting mechanism drives the main trolley hook to move up and down, and the auxiliary lifting mechanism drives the auxiliary trolley hook to move up and down. In the present embodiment, the main lifting mechanism and the auxiliary lifting mechanism are both winches.

[0075] The lifting height protection method prevents the hoisted items from tilting by controlling the height difference between the main trolley and the auxiliary trolley hooks, and has a higher safety factor. In this embodiment, the main lifting height monitoring device is an angle sensor installed on the side of the main drum 231 of the main trolley, and the auxiliary lifting height monitoring device is an angle sensor installed on the side of the auxiliary drum 233 of the auxiliary trolley. The lifting height of the hooks of the main and auxiliary trolleys is obtained by converting the monitoring values ​​of the angle sensors on the main and auxiliary trolleys by the control device to obtain the lifting height (H3, H4) of the hooks of the main and auxiliary trolleys. In other embodiments, the hook height change value measured by the height sensor can also be directly used to monitor the lifting height (H3, H4) of the hooks of the main and auxiliary trolleys.

[0076] Fig.14 The flowchart of the load protection method of the lifting protection system of the double-trolley bridge crane with lifting mode according to one embodiment of the utility model is schematically shown.

[0077] The load protection method includes the following steps:

[0078] Real-time monitoring of the lifting load of the main trolley and the auxiliary trolley respectively;

[0079] Compare the lifting load G1 of the main trolley with the rated load of the main trolley. If the lifting load G1 of the main trolley is greater than the rated load of the main trolley, the main trolley stops lifting; compare the lifting load G2 of the auxiliary trolley with the rated load of the auxiliary trolley. If the lifting load G1 of the auxiliary trolley is greater than the rated load of the auxiliary trolley, the auxiliary trolley stops lifting;

[0080] The sum of the lifting load G1 of the main trolley and the lifting load G2 of the auxiliary trolley is compared with the rated load of the crane. If G1+G2 is greater than the rated load of the crane, both the main trolley and the auxiliary trolley will stop lifting. The load protection method takes into account the loads of the main trolley and the auxiliary trolley at the same time, and whether the sum of the two exceeds the rated load of the crane, and has a higher safety factor.

[0081] refer to Fig.14 As shown, the main and auxiliary trolleys are respectively provided with load sensors. The main load sensor is used to monitor the lifting load of the main trolley in real time, and output the measured lifting load value G1 of the main trolley to the control device; the auxiliary load sensor is used to monitor the lifting load of the main trolley in real time, and output the measured lifting load value G2 of the auxiliary trolley to the control device. The load sensors of the main and auxiliary trolleys output 4-20mAn analog quantity to the control device, and the control device converts the analog quantity into a digital quantity and compares it with the rated load of the main and auxiliary trolleys respectively. When G1 is greater than the rated load of the main trolley, the main trolley hook stops lifting; when G2 is greater than the rated load of the auxiliary trolley, the auxiliary trolley hook stops lifting; when G1+G2 is greater than the rated load of the crane, the main and auxiliary trolley hooks both stop lifting; when G1 is less than the rated load of the main trolley, G2 is less than the rated load of the auxiliary trolley, and G1+G2 is less than the rated load of the crane, the main and auxiliary trolley hooks continue to lift.

[0082] When G1 is greater than the rated load of the main trolley and G2 is less than the rated load of the auxiliary trolley, the main trolley hook stops lifting and the auxiliary trolley hook continues lifting. When G1 is less than the rated load of the main trolley and G2 is greater than the rated load of the auxiliary trolley, the main trolley hook continues lifting and the auxiliary trolley hook stops lifting. This situation is suitable for turning over the hoisted objects.

[0083] Fig.15 The flowchart of the lifting point distance protection method of the lifting protection system of the double trolley bridge crane with lifting mode according to one embodiment of the utility model is schematically shown.

[0084] The lifting point distance protection method includes real-time monitoring of the travel distance S1 of the main trolley and the travel distance S2 of the auxiliary trolley; when the absolute value of S1-S2 is greater than the allowable distance deviation, the fast trolley is controlled to slow down or the slow trolley is controlled to accelerate.

[0085] The crane is also provided with a main displacement detection device and a secondary displacement detection device, as well as a main traveling mechanism for driving the main trolley and a secondary traveling mechanism for driving the secondary trolley. The main displacement detection device is used to monitor the traveling distance of the main trolley and output the detected displacement value S1 to the control device; the secondary displacement detection device is used to monitor the traveling distance of the secondary trolley and output the detected displacement value S2 to the control device. The control device is used to compare the received absolute value of S1-S2 with the allowable deviation of the traveling distance. If the absolute value of S1-S2 is greater than the allowable deviation, a traveling control instruction is issued to the main traveling mechanism or the secondary traveling mechanism; the main traveling mechanism or the secondary traveling mechanism executes the traveling control instruction, driving the fast trolley to decelerate or controlling the slow trolley to accelerate.

[0086] In this embodiment, the main displacement detection device and the auxiliary displacement detection device both use encoders. In other embodiments, the main displacement detection device and the auxiliary displacement detection device may also use other devices that can measure the displacement of an object, such as displacement sensors.

[0087] The main traveling mechanism comprises a main traveling motor, and the auxiliary traveling mechanism comprises an auxiliary traveling motor.

[0088] refer to Fig.15 As shown, the main trolley encoder measures the number of rotations of the main trolley's running roller n1, and the auxiliary trolley encoder measures the number of rotations of the auxiliary trolley's running roller n2. The main trolley encoder and the auxiliary trolley encoder output ~20mAn analog quantity to the control device respectively, and the control device calculates the running distance (S1, S2) of the main and auxiliary trolleys respectively, and calculates the absolute value of S1-S2. The control device compares the absolute value of S1-S2 with the allowable deviation of the system. If the absolute value of S1-S2 is greater than the allowable deviation of the system, the control device controls the fast trolley to slow down or controls the slow trolley to accelerate; if the absolute value of S1-S2 is less than the allowable deviation of the system, the main and auxiliary trolleys continue to travel. During the lifting and walking process, maintaining the deviation of the lifting point distance of the main and auxiliary trolleys within the allowable range can prevent safety hazards caused by excessive deflection of the wire rope.

[0089] The main trolley lifting mechanism includes a main lifting motor and a main drum 231 , and the auxiliary trolley lifting mechanism includes an auxiliary lifting motor and an auxiliary drum 233 .

[0090] The lifting speed protection method includes controlling the motor speed ratio of the main lifting motor and the auxiliary lifting motor according to formula (1) so that the lifting speeds of the two motors are kept consistent;

[0091]

[0092] in:

[0093] n1 is the main trolley hoisting motor speed, d1 is the main trolley drum diameter, i1 is the main trolley hoisting reducer (or open gear) speed ratio, m1 is the main trolley hoisting pulley ratio;

[0094] n2 is the speed of the auxiliary trolley lifting motor, d2 is the diameter of the auxiliary trolley drum, i2 is the speed ratio of the auxiliary trolley lifting reducer (or containing open gears), and m2 is the ratio of the auxiliary trolley lifting pulley group.

[0095] During the lifting process, maintaining the lifting speed of the hooks of the main and auxiliary trolleys within the error range can prevent the hoisted objects from tilting and causing safety hazards.

[0096] The lifting height protection method also includes upper and lower limit protection of the hook. When the hook drops to the lower limit, the control system cuts off the hook group's descending circuit; when the hook drops to the upper limit, the control system cuts off the hook group's lifting circuit.

[0097] The control device is also used to control the speed ratio of the main travel motor and the auxiliary travel motor to make the travel speeds of the main trolley and the auxiliary trolley consistent.

[0098] The walking speed protection method includes controlling the motor speed ratio of the main walking motor and the auxiliary walking motor according to formula (2) so that the walking speeds are kept consistent;

[0099]

[0100] in:

[0101] n1 is the speed of the main trolley motor, d1 is the diameter of the main trolley wheel, and i1 is the speed ratio of the main trolley reducer (or open gear);

[0102] n2 is the speed of the auxiliary trolley's travel motor, d2 is the auxiliary trolley's wheel diameter, and i2 is the speed ratio of the auxiliary trolley's travel reducer (or open gear).

[0103] During the lifting process, maintaining the travel speed of the main and auxiliary trolleys within the error range can prevent safety hazards caused by excessive deviation of the wire rope.

[0104] The shield construction in the middle of the tunnel requires the installation of two shield machines in the shield machine installation room. The directions of the two shield machines are opposite, so the position and placement direction of the two trolleys of the bridge crane used to install the two shield machines can be adjusted. The customization cost of large-tonnage bridge cranes is very high. If they are only used to install shield machines, it will cause a waste of resources. After the tunnel construction is completed, the large-tonnage bridge crane used for construction needs to be converted into a hoisting equipment for production. When the large-tonnage bridge crane is used as tunnel construction equipment, it is restricted by many aspects such as space layout and tunnel limit size. Therefore, the large-tonnage bridge crane must meet the different tense requirements of shield machine hoisting construction, segment hoisting, and production hoisting in both directions of the tunnel, and must have a flexible functional conversion design in structure.

[0105] Figure 16-18 The frame structure of the main trolley of a large-tonnage crane according to one embodiment of the utility model is schematically shown.

[0106] refer to Figure 16-18 As shown, the main trolley 221 includes a first main beam 251, a second main beam 252 and a supporting beam 253 which are parallel to each other, and two auxiliary beams 254 connecting the first main beam 251, the second main beam 252 and the supporting beam 253. A guardrail 74 is provided on the outer edge of the upper end of the first main beam 251. There is a certain gap between the first main beam 251 and the second main beam 252 for the wire rope or the hook assembly to pass through. A first through hole 2511 is provided in the middle of the first main beam 251, which is connected from top to bottom, for the wire rope of the main hoist of the crane to pass through during production.

[0107] A retractable guardrail 70 is provided on one side of the second main beam 252 close to the first main beam 251. The retractable guardrail 70 is L-shaped as a whole, including a handrail 71 and a retractable seat, the retractable seat including a bottom rod 72 connected to the handrail 71, and a base 73 provided on the second main beam 252. The base 73 is hollow, and the bottom rod 72 is inserted into the base 73. Fig.16 As shown, when the crane is in the construction state, the main hoisting device is installed in the first installation position, and the bottom rod 72 can be pulled out from the base 73 toward the direction of the first main beam 251. Fig.17 As shown, when the crane is in production state, the main hoisting device is installed in the second installation position, and the bottom rod 72 can be pushed toward the second main beam 252, so that the handrail 71 of the retractable guardrail 70 will not interfere with the main drum 231.

[0108] The supporting beam 253 abuts against the second main beam 252 , and a second through hole 2531 penetrating from top to bottom is provided on the supporting beam 253 , and the second through hole 2531 is for the steel wire rope of the small winch to pass through.

[0109] The two ends of the main beam of the traditional trolley frame are overlapped on the upper end of the secondary beam, so that the overall height of the trolley frame is relatively high. Due to the size limitation of the use scenario of the bridge crane of the utility model in the tunnel, the height of the trolley frame needs to be as small as possible. Fig.18 As shown, the two ends of the first main beam 251 and the second main beam 252 of the main trolley of the bridge crane of the utility model are inserted into the auxiliary beam 254 and welded with the auxiliary beam 254. In this way, the height of the trolley frame of the utility model is reduced by half compared with the height of the traditional trolley frame.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A lifting protection system for a double-trolley bridge crane with a lifting mode, wherein the double-trolley bridge crane comprises a main trolley and an auxiliary trolley, and is characterized in that: include: A main lifting height monitoring device, an auxiliary lifting height monitoring device and a control device, as well as a main lifting mechanism for driving the main trolley hook to move up and down and an auxiliary lifting mechanism for driving the auxiliary trolley hook to move up and down; The main lifting height monitoring device is used to monitor the lifting height of the main trolley hook in real time, and output the measured lifting height value H3 of the main trolley hook to the control device; The auxiliary lifting height monitoring device is used to monitor the lifting height of the auxiliary trolley hook in real time, and output the measured lifting height value H4 of the auxiliary trolley hook to the control device; The control device is used to compare the received absolute value of H3-H4 with the allowable deviation of the lifting height, and when the absolute value of H3-H4 is greater than the allowable deviation, a lifting control instruction is issued to the main lifting mechanism or the auxiliary lifting mechanism; The main lifting mechanism or the auxiliary lifting mechanism is used to execute the lifting control instruction, drive the lifting or lowering hook with a fast speed to decelerate or drive the lifting or lowering hook with a slow speed to accelerate.

2. The lifting protection system according to claim 1, characterized in that: It also includes a main load sensor and a secondary load sensor; The main load sensor is used to monitor the lifting load of the main trolley in real time, and output the measured lifting load value G1 of the main trolley to the control device; The auxiliary load sensor is used to monitor the lifting load of the main trolley in real time, and output the measured lifting load value G2 of the auxiliary trolley to the control device; The control device is used to compare the received G1 with the rated load of the main trolley. If G1 is greater than the rated load of the main trolley, a main stop control instruction is issued to the main lifting mechanism; the control device is also used to compare the received G2 with the rated load of the auxiliary trolley. If G2 is greater than the rated load of the auxiliary trolley, a secondary stop control instruction is issued to the secondary lifting mechanism; the control device is also used to compare the received G1+G2 with the rated load of the crane. If G1+G2 is greater than the rated load of the crane, a main stop control instruction is issued to the main lifting mechanism and a secondary stop control instruction is issued to the secondary lifting mechanism at the same time; The main lifting mechanism is used to execute the main stop control command and stop lifting the main trolley hook; The auxiliary lifting mechanism is used to execute the auxiliary stop control command to stop lifting the auxiliary trolley hook.

3. The lifting protection system according to claim 2, characterized in that: The main lifting mechanism includes a main lifting motor, and the auxiliary lifting mechanism includes an auxiliary lifting motor; The control device is used to control the speed ratio of the main lifting motor and the auxiliary lifting motor so that the lifting speeds of the main trolley hook and the auxiliary trolley hook are consistent.

4. The lifting protection system according to claim 1, characterized in that: It also includes a main displacement detection device and a secondary displacement detection device, as well as a main traveling mechanism for driving the main trolley to travel and a secondary traveling mechanism for driving the secondary trolley to travel; The main displacement detection device is used to monitor the travel distance of the main trolley and output the detected displacement value S1 to the control device; The auxiliary displacement detection device is used to monitor the travel distance of the auxiliary trolley and output the detected displacement value S2 to the control device; The control device is used to compare the received absolute value of S1-S2 with the allowable deviation of the walking distance, and if the absolute value of S1-S2 is greater than the allowable deviation, a walking control instruction is issued to the main walking mechanism or the auxiliary walking mechanism; The main walking mechanism or the auxiliary walking mechanism is used to execute walking control instructions, driving a fast-speed trolley to decelerate or controlling a slow-speed trolley to accelerate.

5. The lifting protection system according to claim 4, characterized in that: The main walking mechanism includes a main walking motor, and the auxiliary walking mechanism includes an auxiliary walking motor; The control device is used to control the speed ratio of the main travel motor and the auxiliary travel motor so that the travel speeds of the main trolley and the auxiliary trolley are consistent.

6. The lifting protection system according to any one of claims 1 to 5, characterized in that: It also includes a sway reduction device for the hook assembly; The sway reduction device includes a telescopic rod and a plurality of displacement sensors, as well as a control device and a driving device; The lower end of the telescopic rod is arranged on the top of the hanging plate of the hook group, and the upper part is installed on the telescopic rod mounting seat through a spherical roller bearing; the telescopic rod mounting seat is arranged on the trolley frame of the bridge crane; The displacement sensor is arranged on the trolley frame of the bridge crane, evenly arranged on the circumference of the circle with the telescopic rod as the center, and is used to detect the position of the telescopic rod and output the displacement data of the telescopic rod to the control device; The control device is used to determine the swing direction of the hook group according to the received multiple displacement data, and output a driving instruction to the driving device; The drive device is used to execute drive instructions to drive the trolley or carriage of the bridge crane to decelerate or accelerate.

7. The lifting protection system according to claim 6, characterized in that: The telescopic rod includes a plurality of telescopic joints sleeved from the outside to the inside, the outermost telescopic joint includes an upper pressing plate, a steel pipe and a lower pressing plate, and each internal telescopic joint includes an upper pressing plate, a sliding bearing, a connecting shaft, a steel pipe and a lower pressing plate arranged in sequence from top to bottom; On the same expansion joint, the steel pipe is fixedly connected to the lower end of the connecting shaft, the sliding bearing is sleeved outside the connecting shaft, and the upper pressure plate is connected to the upper end of the connecting shaft; the outer diameter of the sliding bearing is larger than the outer diameter of the steel pipe; the outer diameter of the upper pressure plate is smaller than the outer diameter of the sliding bearing and larger than the inner diameter of the sliding bearing; the inner diameter of the lower pressure plate is consistent with the inner diameter of the steel pipe; the lower part of the lower pressure plate is connected with a flange ring, the inner diameter of the flange ring is larger than the outer diameter of the steel pipe of the adjacent inner expansion joint, and smaller than the outer diameter of the sliding bearing of the adjacent inner expansion joint.

8. The lifting protection system according to claim 7, characterized in that: There is a gap between adjacent expansion joints. The gap between the sliding bearing on the inner expansion joint and its adjacent outer expansion joint is smaller than the gap between the steel pipes. When the inner expansion joint is eccentric or the hook is deflected, the sliding bearing slides in the steel pipe of the adjacent outer expansion joint.

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