Trolley frame of large-tonnage bridge crane capable of being applied to various use scenes

Abstract

The utility model provides a trolley frame of a large-tonnage bridge crane, which can be applied to various use scenes. The trolley frame of the large-tonnage bridge crane comprises a main winch drum mounting seat, a main winch drum mounting seat, a main speed reducer mounting seat, two fixed pulley block mounting seats and a balance wheel mounting seat, connecting lines of first mounting positions and second mounting positions of the main winch winding drum, the main speed reducer and the main motor are perpendicular to the first main beam and the second main beam, and the distances between the first mounting positions and the second mounting positions are equal; when the bridge crane is in a tunnel construction use scene, a main winch winding drum, a main speed reducer and a main motor are all located at a first mounting position; and when the bridge crane is in a production and use scene, the main winch winding drum, the main speed reducer and the main motor are all located at the second mounting position. The trolley frame disclosed by the utility model adopts an ingenious structural design, so that parts on a large-tonnage bridge crane customized for construction in a tunnel can be applied to production requirements by slightly adjusting the positions of the parts, and equipment is fully utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery in tunnels, and in particular to a small frame that can be used for hoisting large-tonnage and large-volume equipment such as shield machines in construction in a narrow space with a low lifting height in a tunnel, and can also be used for hoisting large-tonnage bridge cranes at high lifting heights in production and can be applied to a variety of usage scenarios. Background Art

[0002] Since the tunnel excavation cost of water resource allocation projects is high and there are many safety hazards, in order to reduce construction costs and safety hazards, the excavation size of the tunnel is usually designed to be as small as possible, and the installation room of the shield machine is also designed to be relatively small. Expanding the space of the installation room will increase construction costs and bring greater safety hazards. In the construction of some large-scale water resource allocation projects, it is necessary to dig a tunnel in the mountain. Since the distance between the tunnel and the top of the mountain is large, it is impossible to drill a hole from the top of the mountain to the location of the planned tunnel. In order to shorten the construction period, it is planned to dig from the middle of the tunnel to both ends at the same time. It is necessary to first dig a tunnel as shown in the attached figure. Figure 2 The branch tunnel 120 shown is connected to the middle of the planned tunnel, and then a shield machine installation room 110 is excavated in the middle of the tunnel, and then two shield machines with opposite propulsion directions are installed in the installation room. The two shield machines can simultaneously excavate tunnels in two opposite directions, thereby improving construction efficiency. The shield machine needs to be installed in the installation room 110, and then excavation operations are carried out at both ends after the installation is completed. The ground width of the installation room of the shield machine is only 12 meters, the height from the dome to the ground is only 18.5 meters, the height of the crane's track installation surface from the ground is 11 meters, and the heaviest installation unit of the shield machine, the cutter head, weighs more than 160 tons and has a diameter of 10 meters. In such a small space, it is impossible to use a car crane, tower crane, etc. to hoist a large-tonnage and large-volume component such as the shield machine cutter head. Only a large-tonnage bridge crane can be used for hoisting, and the existing bridge cranes are mostly standard parts, such as the attached Figure 1 As shown, the trolley frame adopts a main beam with a large height. The operating space of the hook is below the main beam of the trolley frame. When the hook is at the upper limit, the distance between the hook hanging point and the track surface is greater than 1 meter. The hook is a standard part, and the length of the hook that can withstand a weight of 160 tons is about 2 meters. Therefore, the diameter of the shield machine cutter head plus the distance between the hook hanging point and the track, plus the space required for the lifting rope, the height of the crane track installation surface from the ground must be at least 13 meters. If the existing bridge crane is used in this project, it cannot meet the hoisting needs of the shield machine because its installation elevation is less than 9 meters. In addition, during the installation of the shield machine, two trolleys with large lifting weights are required for lifting. During the lifting process, due to the need for flipping and other operations, the lifting point distance of the double trolleys needs to have a larger range of variation.

[0003] Since a shield machine is to be installed in each direction of the tunnel, the positions of the two trolleys also need to be interchangeable.

[0004] In order to improve equipment utilization, in this type of tunnel construction, the large-tonnage bridge crane is used to hoist large components such as the shield machine cutter head weighing about 170 tons, as well as small components such as pipe segments weighing about 20 tons. The pipe segments are hoisted onto the shield machine, which is then installed on the side of the excavated tunnel by the shield machine. The pipe segments are used to support the tunnel and keep the fine sand and gravel in the mountain out of the tunnel.

[0005] The cost of customizing a large-tonnage bridge crane is very high. If it is only used to install a shield machine in a tunnel, 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 subject to many restrictions such as space layout and tunnel limit size. Therefore, the large-tonnage bridge crane must meet the requirements of different usage scenarios such as shield machine accessories hoisting construction, pipe segment hoisting, and production hoisting in both directions of the tunnel, and must have a flexible functional conversion design in structure. Utility Model Content

[0006] The utility model provides a large-tonnage bridge crane that can be applied to a variety of usage scenarios to solve at least one of the above problems.

[0007] According to one aspect of the utility model, a trolley frame of a large-tonnage bridge crane that can be applied to a variety of usage scenarios is provided, characterized in that it includes two parallel first main beams and a second main beam, and a first secondary beam and a second secondary beam connected to the first main beam and the second main beam at both ends respectively; it also includes a main winch drum mounting seat, a main winch drum mounting seat, a main reducer mounting seat and a main motor mounting seat, as well as two fixed pulley assembly mounting seats and a balance wheel mounting seat; the main winch drum mounting seat is arranged on the first secondary beam, close to the first main beam, and the main reducer mounting seat is arranged on the second secondary beam; the main motor mounting seat is arranged on the second main beam, close to the main reducer mounting seat; the main winch drum mounting seat is provided with a first main drum mounting position and a second main drum mounting position; the main reducer mounting seat is provided with a first reducer mounting position and a second reducer mounting position; the main motor mounting seat is provided with a first motor mounting position and the second motor installation position; the connecting lines of the first installation position and the second installation position of the main winch drum, the main reducer and the main motor are perpendicular to the first main beam and the second main beam, and the distance between the first installation position and the second installation position is equal; when the bridge crane is in the tunnel construction use scenario: the main winch drum, the main reducer and the main motor are all in the first installation position; one end of the fixed pulley block mounting seat and the balance wheel mounting seat are arranged on the first main beam, and the other end is arranged on the second main beam, so that the rotating shafts of the fixed pulley blocks are perpendicular to the first main beam and the second main beam; when the main hook is in the upper limit position, the movable pulley block is located between the first main beam and the second main beam; when the bridge crane is in the production use scenario: the main winch drum, the main reducer and the main motor are all in the second installation position; one fixed pulley block mounting seat is arranged on the first main beam, and the other fixed pulley block mounting seat is arranged on the second main beam; the rotating shafts of the two fixed pulley blocks are parallel to the first main beam and the second main beam.

[0008] The trolley frame of the large-tonnage bridge crane of the utility model which can be applied to various usage scenarios adopts an ingenious structural design, so that the positions of the components on the large-tonnage bridge crane customized for construction in the tunnel can be slightly adjusted to meet production needs, thereby making full use of the equipment.

[0009] In some embodiments, the first guard plate on the outer side of the first main beam of the utility model is provided with a first through hole extending vertically therethrough.

[0010] In some embodiments, the utility model further comprises a supporting beam arranged in parallel with the first main beam; the supporting beam abuts against the second main beam, and a second through hole penetrating from top to bottom is arranged on the supporting beam.

[0011] In some embodiments, the utility model further comprises two anti-collision devices symmetrically arranged relative to the center line of the trolley. Thus, when the trolley needs to be rotated 180° for installation, the anti-collision devices can still be used.

[0012] In some embodiments, the bridge crane of the utility model includes a hook group, and rough guide plates are provided on the opposite sides of the first main beam and the second main beam, and the opposite sides of the rough guide plates on both sides are inclined surfaces; the distance between the upper ends of the opposite inclined surfaces is smaller than the distance between the lower ends; the distance between the upper ends of the opposite inclined surfaces is smaller than the maximum dimension of the hook group perpendicular to the first main beam and the second main beam; the distance between the lower ends of the opposite inclined surfaces is larger than the maximum dimension of the hook group perpendicular to the first main beam and the second main beam.

[0013] In some embodiments, the rough guide plate of the utility model includes a rough guide web and a wing plate; one side of the rough guide web is welded to the lower part of the opposite side of the first main beam and the second main beam, and the other side of the rough guide web is an inclined surface and is provided with a wing plate.

[0014] In some embodiments, a retractable guardrail is provided on the second main beam of the utility model on one side close to the first main beam, and the retractable guardrail is configured so that its position can be switched between the second main beam and the first main beam.

[0015] In some embodiments, the retractable guardrail of the utility model is L-shaped as a whole, including a handrail and a retractable seat; the retractable seat includes a bottom rod connected to the handrail, and a base arranged on the second main beam; the bottom rod is passed through the base and is slidably connected to the base.

[0016] In some embodiments, the two ends of the first main beam and the second main beam of the utility model are plugged into the two ends of the first sub-beam and the second sub-beam, and the upper surfaces of the first main beam and the second main beam are flush with the upper surfaces of the first sub-beam and the second sub-beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a bridge crane of the prior art;

[0018] Figure 2 This is a schematic diagram of the use state of a large-tonnage bridge crane that can be applied to various use scenarios according to one embodiment of the utility model;

[0019] Figure 3 This is a structural schematic diagram of a large-tonnage bridge crane that can be applied to a variety of usage scenarios according to one embodiment of the utility model;

[0020] Figure 4 This is a partial structural diagram of a large-tonnage bridge crane that can be applied to a variety of usage scenarios according to an embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of a main hook, a movable pulley block, a fixed pulley block and a balance wheel, and the winding of a wire rope of a large-tonnage bridge crane that can be applied to various usage scenarios according to an embodiment of the utility model;

[0022] Figure 6 for Figure 5 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;

[0023] Figure 7 This is a schematic diagram of an anti-top impact and guide structure of a large-tonnage bridge crane that can be applied to a variety of usage scenarios according to an embodiment of the utility model;

[0024] Figure 8 for Figure 7 The schematic diagram of the anti-collision top and the guide structure shown;

[0025] Fig. 9 for Figure 8 The schematic diagram of the installation structure of the guide plate shown;

[0026] Fig.10 for Figure 8 Schematic diagram of the precision guidance and anti-top impact structure shown;

[0027] Fig.11 for Figure 3 The schematic diagram of the arrangement of the main trolley and the auxiliary trolley when the shield machine is lifted in reverse by a large-tonnage bridge crane is shown;

[0028] Fig.12 for Figure 3 The layout diagram of the main trolley and the auxiliary trolley for the use scenario of a large-tonnage bridge crane lifting pipe segments is shown;

[0029] Fig.13 for Figure 3 The diagram shown is a schematic diagram of the arrangement of the main trolley and the auxiliary trolley when the large-tonnage bridge crane is used as a lifting equipment during production;

[0030] Figure 14-15 It is a structural schematic diagram of the main trolley when the large-tonnage crane of the utility model is used as a hoisting device in production;

[0031] Fig.16 This is a structural schematic diagram of the first installation position and the second installation position of the trolley frame of the main trolley of a large-tonnage crane that can be applied to various usage scenarios of the utility model.

[0032] Fig.17 It is a schematic diagram of the wire rope winding structure of the main lifting mechanism of the large-tonnage crane of the utility model when it is used as a lifting equipment in production;

[0033] Figure 18-Figure 20 The present invention is a schematic diagram of the frame structure of a main trolley of a large-tonnage crane according to one embodiment of the present invention. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0038] Figure 2 The installation and use environment of a large-tonnage bridge crane applicable to various use scenarios according to an embodiment of the utility model is schematically shown.

[0039] refer to Figure 2As shown, the large-tonnage bridge crane 200, which can be applied to a variety of usage scenarios, is used for the installation of shield machines in tunnel construction projects. The height of the shield machine installation room 110 from the ground to the dome is 18.5 meters, the ground hole is 12 meters wide, and the rock anchor beam of the first track 111 of the crane's trolley travel mechanism is 11 meters above the ground. The shield machine installation room is located in the middle of the tunnel. It is necessary to first excavate a smaller branch hole 120, and then dig out the shield machine installation room 110 at the end of the branch hole 120. The branch hole 120 is used to transport the bridge crane and the shield machine components to the installation room 110. First install the large-tonnage bridge crane 200 in the shield machine installation room 110, and then use the large-tonnage bridge crane 200 to install a shield machine in two opposite directions of the tunnel. The two shield machines can dig tunnels in two directions at the same time, which can improve excavation efficiency and shorten engineering time. The heaviest installed unit cutter head of the shield machine weighs more than 160 tons and has a diameter of 10 meters. In order to be able to hoist such a large shield machine cutterhead in such a narrow shield machine installation room 110, it is necessary to increase the lifting height of the hook as much as possible so that the upper limit 2611 of the hook is located at the highest possible position.

[0040] Figure 3-6 The structure of a large-tonnage bridge crane applicable to various usage scenarios according to an embodiment of the utility model is schematically shown.

[0041] refer to Figure 3-4 As shown, the large-tonnage bridge crane includes a trolley traveling mechanism 21 and two small trolley traveling mechanisms 22.

[0042] 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.

[0043] 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.

[0044] The drum 233 of the auxiliary hoist is arranged on the first main beam 251 of the auxiliary trolley 222. The auxiliary hoist is used to drive the auxiliary hook 263 to move up and down. The rated load of the auxiliary hook 263 is 100 tons.

[0045] The main winch drum 231 is arranged on the first main beam 251 of the main trolley 221. The 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 the two movable pulley blocks 242 through the 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.

[0046] The two trolleys 22 are both provided with an anti-collision device 352 , a limit device 351 and a trolley stop column 361 .

[0047] refer to Figure 4 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.

[0048] refer to Figure 5 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.

[0049] refer to Figure 4 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.

[0050] 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.

[0051] Figure 7-10 The hook assembly guide and anti-top impact structure of a large-tonnage bridge crane applicable to various usage scenarios according to one embodiment of the utility model is schematically shown.

[0052] refer to Figure 8-9 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.

[0053] refer to Figure 7As 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 close to the bottom of the frame of the main trolley, a deceleration signal is sent to the control system through the height sensor 33. 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.

[0054] 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. Fig. 9 As 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.

[0055] refer to Fig.10 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.

[0056] 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.

[0057] 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. After comparing with the standard picture, 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 operation safety.

[0058] Fig.12 The structure and principle of reducing the sway of the hook assembly of a large-tonnage bridge crane applicable to various usage scenarios according to an embodiment of the utility model are schematically shown.

[0059] refer to Fig.12 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 6 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.

[0060] 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.

[0061] Figure 13-15The invention schematically shows a hook assembly swing reduction structure of a large-tonnage bridge crane that can be applied to a variety of usage scenarios according to another embodiment of the present invention.

[0062] refer to Figure 13-15 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, 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.

[0063] 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.

[0064] The displacement sensor 340 outputs the displacement data of the telescopic rod to the control device.

[0065] 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.

[0066] 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.

[0067] The telescopic rod 348 is composed of four telescopic sections sleeved 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 .

[0072] 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 PLC in the control system 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 PLC 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.

[0073] 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.

[0074] In addition, 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. 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.

[0075] The large-tonnage bridge crane of the utility model, which can be applied to various usage scenarios, has a lifting mode, that is, the main hook of the main trolley and the hook of the auxiliary trolley 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 33 and an auxiliary trolley hook group height detection device 33.

[0076] The lifting protection methods of the double trolley bridge crane with lifting mode include 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.

[0077] 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.

[0078] The utility model utilizes the above detection device and other measuring tools, and through PLC control, can use the following method to protect the lifting operation of the double trolley bridge crane.

[0079] 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 requirements of different usage scenarios such as 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.

[0080] Figure 3 This is the layout diagram of the main trolley and auxiliary trolley for the forward lifting shield machine usage scenario.

[0081] The main trolley 221 is located on the right side of the bridge frame 211 , the auxiliary trolley 222 is located on the left side of the bridge frame 211 , and the main hook 261 of the main trolley 221 is located on the right side of the main trolley 221 .

[0082] Fig.11 This is the layout diagram of the main trolley and auxiliary trolley for the reverse lifting shield machine usage scenario.

[0083] The main trolley 221 is located on the left side of the bridge frame 211 , the auxiliary trolley 222 is located on the right side of the bridge frame 211 , and the main hook 261 of the main trolley 221 is located on the left side of the main trolley 221 .

[0084] Fig.12 This is the layout diagram of the main trolley and auxiliary trolley for the use scenario of lifting pipe segments.

[0085] The main trolley 221 is located on the left side of the bridge frame 211, the auxiliary trolley 222 is located on the right side of the bridge frame 211, and the main hook 261 of the main trolley 221 is located on the left side of the main trolley 221. After the shield machine is installed, the bridge crane is used to hoist the pipe segments. In order to improve construction efficiency and operation safety, the main trolley needs to be rotated 180 degrees as a whole, so that the auxiliary lifting mechanism of the main trolley is adjusted to the middle, and the operating range of the auxiliary lifting mechanism in the middle is increased.

[0086] Fig.13 This is the layout diagram of the main trolley and auxiliary trolley when used as lifting equipment during production.

[0087] After the shield construction is completed, in order to avoid waste of resources, the tunnel construction bridge crane of the utility model is converted into a production bridge crane through appropriate adjustment.

[0088] refer to Fig.13As shown, in the production use scenario, the main trolley 221 is located on the right side of the bridge frame 211, and the auxiliary trolley 222 is located on the left side of the bridge frame 211; the main trolley 221 rotates 180 degrees, the main hook 261 is located on the right side of the main trolley 221, and the small hook 262 is located on the left side of the main trolley 221.

[0089] The lifting height of the large-tonnage crane of the utility model in the production use scenario is 24 meters. The length of the wire rope of the main winch is longer than that in the construction use scenario, and the wire rope basically covers the entire main winch drum 231. The rotating shaft of the fixed pulley group 241 is adjusted to be parallel to the first main beam 251, so that the hanging plate of the main hook 261 is perpendicular to the first main beam 251, and the hanging plate of the auxiliary hook 263 is also perpendicular to the first main beam 251. The supports of the two fixed pulley groups 241 are adjusted to be fixed on the first main beam 251 and the second main beam 252 respectively, and the positions of the two fixed pulley groups 241 are adjusted to be arranged front and back on both sides below the main drum 231. The hanging plate 270 of the main hook group becomes perpendicular to the first main beam 251 and the second main beam 252.

[0090] exist Figure 3 , Fig.11 , Fig.12 In the present invention, the lifting height of the large-tonnage crane in tunnel construction is 11 meters. The main hook group of the main trolley and the hook group of the auxiliary trolley need to be lifted above the rail surface of the first track 111. The hanging plates 270 of the main hook group and the auxiliary hook group are arranged parallel to the first main beam 251 and the second main beam 252. The hanging plates 270 need to be lifted between the two main beams of the trolley frame, and the supports of each fixed pulley group and the supports of the balance wheel are respectively across the two main beams of the trolley frame. The length of the wire rope of the winch is relatively short. The wire rope is only spread over the outside of the pulley outside the hook group on the main drum 241. The rotating shafts of the two fixed pulley groups 241, the two fixed pulley groups 242 and the balance wheel group 243 are all perpendicular to the first main beam 251. The two fixed pulley groups 241 are arranged left and right below one side of the main drum 231.

[0091] Figure 14-15 The structure of the main trolley of the large-tonnage crane of the utility model when used as a lifting device in production is schematically shown.

[0092] Fig.16 The utility model schematically shows the arrangement structure of the first installation position and the second installation position of the trolley frame of the main trolley of the large-tonnage crane.

[0093] refer to Figure 14-16As shown, the first fixed pulley block installation position 441 is the installation position of the fixed pulley block 241 during construction. During construction, the rotation axis of the fixed pulley block 241 is perpendicular to the first main beam 251, so the first fixed pulley block installation position 441 is two sets of screw holes parallel to the first main beam 251. The second fixed pulley block installation position 442 is the installation position of the fixed pulley block 241 during production. During production, the rotation axis of the fixed pulley block 241 is parallel to the first main beam 251, so the first fixed pulley block installation position 441 is two sets of screw holes perpendicular to the first main beam 251.

[0094] refer to Fig.16 As shown, two groups of installation positions are set on the first main beam 251 and the second main beam 252 of the main trolley. The first installation position is used for the installation of the main hoisting device, the main reducer, the two fixed pulley groups 241 and other equipment in the construction use scenario, and the second installation position is used for the installation of the main hoisting device, the main reducer, the two fixed pulley groups 241 and other equipment in the production use scenario. When the main trolley is converted from the shield machine construction use scenario to the production use scenario, the motor, reducer, brake, hoisting device and height sensor and other devices need to be translated to the side of the small hoist drum by a distance K. In this embodiment, K is 244 mm. A drum seat, a reducer seat and a motor seat are set on the first main beam 251. Two groups of installation positions for the main drum 231 are set on the drum seat. The first main drum installation position 411 is the installation position of the main drum 231 during construction, and the second main drum installation position 412 is the installation position of the main drum 231 during production. The position of the main drum 231 is higher than the fixed pulley group 241. In this embodiment, the distance between the first main reel installation position 411 and the second main reel installation position 412 is 244 mm.

[0095] The reducer seat is provided with two sets of reducer installation positions, the first reducer installation position 421 is the installation position of the reducer of the main hoisting device during construction, and the second reducer installation position 422 is the installation position of the reducer of the main hoisting device during construction. The motor seat is provided with two sets of motor installation positions, the first motor installation position 431 is the installation position of the motor of the main hoisting device during construction, and the second motor installation position 432 is the installation position of the motor of the main hoisting device during construction.

[0096] In the construction state, the wire rope is short. When the hook is lifted to the upper limit, the wire rope is arranged outside the hook pulley block, and there is no wire rope wound in the middle of the main drum 231. The wire rope is wound from the outside of the movable pulley block of the hook block into the fixed pulley block, and a balance wheel 243 is provided between the two fixed pulley blocks 241. In the construction state, the motor, reducer, brake, hoisting device and height sensor of the main lifting mechanism of the main and auxiliary trolleys are all installed in the first installation position.

[0097] In production use scenarios, since the lifting height of the hook can be large and the hook does not need to be lifted above the bottom surface of the trolley frame during lifting, a certain safety distance can be reserved between the hook group and the bottom surface of the trolley frame. At this time, the hanging plate of the hook group is arranged perpendicular to the length direction of the main beam of the trolley frame. The rotating shafts of the two sets of fixed pulley groups 241 are parallel to the main beam of the trolley frame and are placed on the two main beams of the trolley frame respectively. The motor, reducer, brake, winch and height sensor of the main lifting mechanism of the main and auxiliary trolleys are all assembled in the second installation position.

[0098] Fig.17 The utility model schematically shows the wire rope winding structure of the main lifting mechanism of the large-tonnage crane when it is used as a lifting device in production.

[0099] refer to Figure 6 and Fig.17 As shown, the main lifting mechanism of the main and auxiliary trolleys for construction use scenarios and production use scenarios are different. The main lifting mechanism of the main and auxiliary trolleys for construction use scenarios includes a balancing wheel 243 and a balancing wheel support 53, and relies on the balancing wheel 243 to keep the left and right balance of the wire rope. Fig.17 As shown, the main lifting mechanism of the main and auxiliary trolleys in the production and use scenario does not have an independent balance wheel and balance wheel support, and relies on one side pulley 245 in the front and rear fixed pulley groups 241 as a balance wheel to keep the front and rear balance of the wire rope. The two ends of the wire rope 271 of the main hoist 231 are respectively fixed to the two ends of the main hoist drum 231. The left section of the wire rope 271 includes the left winding section 541 that bypasses the left section of the main hoist drum, the front fixed pulley section 611 that bypasses the front fixed pulley group, and the front movable pulley section 621 that bypasses the front movable pulley group; the right section of the wire rope 271 includes the rear movable pulley section 622 that bypasses the rear movable pulley group, the rear fixed pulley section 612 that bypasses the rear fixed pulley group, and the right winding section 542 that bypasses 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 and the movable pulley block on the same side. The rightmost wheel of the front and rear fixed pulley blocks is a balance wheel, and the section of the wire rope wound on the balance wheel is a side pulley section 643.

[0100] The structural features of the fixed pulley group of a large-tonnage crane of the utility model are as follows: compared with the number of pulleys in a traditional pulley group, the number of traditional fixed pulleys is twice the movable pulley ratio n minus 2, that is, the number of fixed pulleys is 2 less than the number of movable pulleys in the hook group; in the utility model, the number of fixed pulleys is twice the movable pulley ratio n, that is, the number of fixed pulleys is the same as the number of movable pulleys in the hook group, and the two side pulleys therein do not play a role in construction use scenarios, and the two side pulleys are used together as balance wheels in production use scenarios.

[0101] The auxiliary trolley 222 is converted from the use scenario of shield machine construction to the use scenario of production. The conversion and installation methods of the motor, reducer, brake, winch device, height sensor and other devices on it are basically the same as those of the main trolley 221 and will not be repeated here.

[0102] A left power supply device 301 and a right power supply device 302 for supplying power to the trolley are respectively provided on the bridge frame 211, and a terminal box 303 is also provided on the main and auxiliary trolleys, respectively. The left power supply device 301 and the right power supply device 302 are configured according to the maximum power supply capacity and the maximum number of power and control paths. Any power supply device can meet the power supply and control requirements of the main and auxiliary trolleys. A quick plug is provided between the power supply device and the terminal box. When the trolley needs to be changed or rotated 180°, the power supply and control lines of the main and auxiliary trolleys can be quickly replaced.

[0103] The conversion of the construction use scenario into the production use scenario includes the following steps:

[0104] Step 1. Release the lower limit protection of the main hook of the main and auxiliary trolleys, and lower the main hook assembly of the main and auxiliary trolleys to the ground and fix them.

[0105] Step 2. Remove the wire ropes of the main and auxiliary trolleys’ main lifting mechanisms.

[0106] Step 3. Remove the balance wheel device and balance wheel support configured during the construction use scenario.

[0107] Step 4. Loosen the connecting bolts between the fixed pulley block and the trolley frame, rotate the two fixed pulley blocks by 90 degrees respectively, and install them on the first main beam and the second main beam of the trolley frame respectively. The center distance between the two fixed pulley blocks in the direction perpendicular to the pulley axis is a distance A. In this embodiment, A is 160 mm.

[0108] Step 5. Loosen the connecting bolts between the main lifting mechanism motor, reducer, brake, winch device and height sensor of the main and auxiliary trolleys and the trolley frame, and assemble them respectively in the second installation position.

[0109] Step 6. Wind the wire rope, and choose a wire rope that can meet the maximum lifting height. One end is wound from the middle to the front fixed pulley group, and the balance wheel is passed around the front pulley group of the hook and the front fixed pulley group in turn, and then fixed to the left fixed end of the drum; the other end is wound from the middle to the rear fixed pulley group, and the balance wheel is passed around the rear pulley group of the hook and the rear fixed pulley group in turn, and then fixed to the right fixed end of the drum.

[0110] Step 7. Re-adjust the upper and lower limit heights of the main winches of the main and auxiliary trolleys to be within the safe operating range.

[0111] Figure 18-20 The frame structure of the main trolley of a large-tonnage crane according to one embodiment of the utility model is schematically shown.

[0112] refer to Figure 18-20 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 (including a first auxiliary beam 2541 and a second auxiliary beam 2542) 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 group to pass through. The first guard plate 256 on the outer side of the first main beam 251 is provided with a first through hole 2561 which runs through from top to bottom for the wire rope of the main winch of the bridge crane to pass through. A guardrail 74 is installed on the upper edge of the first guard plate 256.

[0113] 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.18 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.19 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.

[0114] The supporting beam 253 is against the second main beam 252, and a second through hole 2531 is provided on the supporting beam 253, through which the steel wire rope of the small hoist passes. A second guard plate 255 is also provided on the other side of the supporting beam 253, and a guardrail 74 is installed on the second guard plate 255. A third through hole 2551 is provided on the inner side of the second guard plate 255, and the steel wire rope of the small hoist passes through the third through hole 2551.

[0115] 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. 20 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 first sub-beam 2541 and the second sub-beam 2542, and are welded to the first sub-beam 2541 and the second sub-beam 2542, and the upper surfaces of the first main beam 251 and the second main beam 252 are flush with the upper surfaces of the first sub-beam 2541 and the second sub-beam 2542. 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.

[0116] 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 small frame of a large-tonnage bridge crane that can be used in a variety of usage scenarios, characterized by: It comprises a first main beam and a second main beam which are arranged in parallel, and a first auxiliary beam and a second auxiliary beam which are connected to the first main beam and the second main beam at two ends respectively; It also includes a main winch drum mounting seat, a main winch drum mounting seat, a main reducer mounting seat and a main motor mounting seat, as well as two fixed pulley assembly mounting seats and a balance wheel mounting seat; The main hoist drum mounting seat is arranged on the first secondary beam, close to the first main beam, the main reducer mounting seat is arranged on the second secondary beam; the main motor mounting seat is arranged on the second main beam, close to the main reducer mounting seat; The main winch drum mounting seat is provided with a first main drum mounting position and a second main drum mounting position; The main reducer mounting seat is provided with a first reducer mounting position and a second reducer mounting position; The main motor mounting seat is provided with a first motor mounting position and a second motor mounting position; The connecting lines of the first installation position and the second installation position of the main hoist drum, the main reducer and the main motor are perpendicular to the first main beam and the second main beam, and the distance between the first installation position and the second installation position is equal; When the bridge crane is used in tunnel construction: The main hoist drum, main reducer and main motor are all in the first installation position; one end of the fixed pulley assembly mounting seat and the balance wheel mounting seat are arranged on the first main beam, and the other end is arranged on the second main beam, so that the rotating shaft of the fixed pulley assembly is perpendicular to the first main beam and the second main beam; when the main hook is at the upper limit position, the movable pulley assembly is located between the first main beam and the second main beam; When the bridge crane is in a production use scenario: the main winch drum, the main reducer and the main motor are all in the second installation position; one of the fixed pulley assembly mounting seats is arranged on the first main beam, and the other fixed pulley assembly mounting seat is arranged on the second main beam; the rotating shafts of the two fixed pulley assemblies are parallel to the first main beam and the second main beam.

2. The small frame of a large-tonnage bridge crane applicable to various usage scenarios according to claim 1 is characterized in that: The first guard plate is disposed on the outer side of the first main beam, and the first guard plate is provided with a first through hole which passes through the first guard plate from top to bottom.

3. The small vehicle frame according to claim 2, characterized in that: Also includes a supporting beam arranged parallel to the first main beam; The supporting beam abuts against the second main beam, and a second through hole penetrating vertically is arranged on the supporting beam.

4. The small frame of a large-tonnage bridge crane applicable to various usage scenarios according to claim 1 is characterized in that: It also includes two anti-collision devices that are symmetrically arranged relative to the center line of the trolley.

5. The small frame of a large-tonnage bridge crane applicable to various usage scenarios according to any one of claims 1 to 4, characterized in that: The bridge crane comprises a hook assembly, and a first main beam and a second main beam are both provided with a rough guide plate on one side opposite to the other, and the rough guide plates on both sides have an inclined surface on one side opposite to the other; The distance between the upper ends of the opposite slopes is smaller than that between the lower ends; The distance between the upper ends of the opposite inclined surfaces is smaller than the maximum dimension of the hook assembly in a direction perpendicular to the first main beam and the second main beam; The distance between the lower ends of the opposite inclined surfaces is greater than the maximum dimension of the hook assembly perpendicular to the direction of the first main beam and the second main beam.

6. The small frame of a large-tonnage bridge crane applicable to various usage scenarios according to claim 5 is characterized in that: The rough guide plate comprises a rough guide web and a wing plate; One side of the rough guide web is welded to the lower part of the opposite side of the first main beam and the second main beam, and the other side of the rough guide web is an inclined surface and is provided with a wing plate.

7. The small frame of a large-tonnage bridge crane applicable to various usage scenarios according to any one of claims 1 to 4, characterized in that: A retractable guardrail is arranged on one side of the second main beam close to the first main beam, and the retractable guardrail is arranged so that its position can be switched between the second main beam and the first main beam.

8. The small frame of a large-tonnage bridge crane applicable to various usage scenarios according to claim 7 is characterized in that: The retractable guardrail is L-shaped as a whole, including a handrail and a retractable seat; the retractable seat includes a bottom rod connected to the handrail, and a base arranged on the second main beam; The bottom rod is inserted into the base and is slidably connected to the base.

9. The small frame of a large-tonnage bridge crane applicable to various usage scenarios according to claim 1 is characterized in that: The two ends of the first main beam and the second main beam are plugged into the two ends of the first auxiliary beam and the second auxiliary beam, and the upper surfaces of the first main beam and the second main beam are flush with the upper surfaces of the first auxiliary beam and the second auxiliary beam.

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