Compact trolley frame of bridge crane

Abstract

The utility model provides a compact trolley frame of a bridge crane. The compact trolley frame comprises a first main beam, a second main beam and two auxiliary beams, wherein the first main beam and the second main beam are parallel to each other; the first main beam and the second main beam are provided with gaps for a steel wire rope or a lifting hook group of the crane to pass through; a telescopic guardrail is arranged on the side, close to the first main beam, of the second main beam, and the position of the telescopic guardrail can be switched between the second main beam and the first main beam. According to the compact trolley frame of the bridge crane, the double-main-beam design is adopted, and compared with the single-main-beam variable cross-section design adopted by the main beams of the traditional trolley frame, the height of the trolley can be greatly reduced under the condition that the strength of the main beams of the trolley is not reduced. The telescopic guardrails are convenient for the bridge crane to be converted from the construction tense to the production tense, and after shield construction is completed, in order to avoid resource waste, the bridge crane for tunnel construction is converted into the bridge crane for production after being properly adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction machinery, in particular to a compact trolley frame of a bridge crane. Background Art

[0002] Since the tunnel excavation cost of the water resource allocation project 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 will also be 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 the Guangdong Water Resource Allocation Project around the Beibu Gulf undertaken by our company, 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 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, its height and width cannot meet the hoisting needs of tunnel construction. In addition, during the installation of the shield machine, a double trolley with a large lifting capacity is required for lifting. During the lifting process, due to the need for flipping and other operations, the lifting point distance of the double trolley needs to have a larger range of variation.

[0003] 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 existing large-tonnage bridge crane with a span of 12 meters has a lifting point distance of only 2.7 to 9 meters for the left and right trolleys, which cannot meet the lifting requirements of the above-mentioned shield machines and tunnel segments. The segments are hoisted onto the shield machine, which is then installed on the side of the excavated tunnel by the shield machine. The segments are used to support the tunnel and keep the fine sand and gravel in the mountain out of the tunnel. Utility Model Content

[0004] The utility model provides a compact small vehicle frame of a bridge crane to solve at least one of the above problems.

[0005] According to one aspect of the utility model, a compact trolley frame of a bridge crane is provided, comprising a first main beam and a second main beam parallel to each other, and two auxiliary beams connecting the first main beam and the second main beam at both ends; the first main beam and the second main beam are provided with gaps for the wire rope or hook assembly of the crane to pass through; a retractable guardrail is provided 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.

[0006] The compact trolley frame of the utility model adopts a double main beam design. Compared with the variable cross-section design of the traditional trolley frame main beam adopting a single main beam, the height of the trolley can be greatly reduced without reducing the strength of the trolley main beam. The retractable guardrail facilitates the conversion of the bridge crane from the construction state to the production state. 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 adjustments.

[0007] 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.

[0008] In some embodiments, a first through hole is provided in the middle of the first main beam of the utility model, which passes through from top to bottom, for the steel wire rope of the main hoist of the bridge crane to pass through.

[0009] In some embodiments, the utility model further comprises a support beam arranged in parallel with the first main beam; the support beam abuts against the second main beam, and a second through hole extending vertically is arranged on the support beam, and the second through hole is used for the wire rope of the small hoist of the bridge crane to pass through. In addition to the need to install a large-tonnage lifting device on the trolley of the bridge crane, a small-tonnage lifting device also needs to be installed at the same time. The side beam abutting against one of the main beams can make the size of the trolley frame as compact as possible to meet the needs of large-tonnage and small-tonnage lifting.

[0010] In some embodiments, the first main beam and the second main beam of the utility model are both provided with guide plates on the opposite sides, and the opposite sides of the 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 hanging plate of the hook group of the bridge crane 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 hanging plate of the hook group of the bridge crane perpendicular to the first main beam and the second main beam. In this way, it is possible to prevent the hook group from hitting the main beam during the lifting process to cause a safety accident.

[0011] In some embodiments, the guide plate of the utility model includes a guide web and a wing plate; one side of the 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 guide web is an inclined surface and is provided with a wing plate.

[0012] 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 auxiliary beam, and the upper surface of the first main beam and the second main beam is flush with the upper surface of the auxiliary beam. The two ends of the main beam of the traditional small frame are overlapped on the upper end of the auxiliary beam, so that the overall height of the small frame will be relatively high. The height of the small frame of the utility model can be reduced by half compared with the height of the traditional small frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a bridge crane of the prior art;

[0014] Figure 2 A schematic diagram of a bridge crane in use according to one embodiment of the utility model;

[0015] Figure 3 This is a schematic structural diagram of a bridge crane according to one embodiment of the utility model;

[0016] Figure 4 This is a partial structural schematic diagram of a bridge crane according to one embodiment of the utility model;

[0017] Figure 5 It is a schematic structural diagram of a main hook, a movable pulley block, a fixed pulley block and a balance wheel of a compact trolley frame of a bridge crane according to one embodiment of the utility model, and winding of a wire rope;

[0018] 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;

[0019] Figure 7 This is a schematic structural diagram of a main trolley of a bridge crane according to one embodiment of the utility model;

[0020] Figure 8 for Figure 7 A schematic diagram of the partial structure of the main trolley shown;

[0021] Fig. 9 for Figure 8 The schematic diagram of the structure of the compact trolley frame of the bridge crane shown;

[0022] Fig.10 for Figure 3 The schematic diagram of the arrangement of the main trolley and the auxiliary trolley of the bridge crane shown in the figure when it is used as a lifting equipment during production;

[0023] Figure 11-13 This is a structural schematic diagram of the main trolley when the crane of the utility model is used as a hoisting device in production;

[0024] Fig.14 It is a schematic diagram of the wire rope winding structure of the main lifting mechanism when the crane of the utility model is used as a lifting equipment in production;

[0025] Figure 15-17 The present invention is a schematic diagram of a compact trolley frame structure of a bridge crane according to one embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0030] Figure 2 The installation and use environment of a compact trolley frame of a bridge crane according to an embodiment of the utility model is schematically shown.

[0031] refer to Figure 2 As shown, the compact trolley frame 200 of the bridge crane 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 a 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.

[0032] Figure 3-6 The structure of a compact trolley frame of a bridge crane according to an embodiment of the utility model is schematically shown.

[0033] refer to Figure 3-4 As shown, the large-tonnage bridge crane 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] 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.

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

[0039] 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.

[0040] 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.

[0041] 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.

[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 7-8 The structure of a main trolley of a bridge crane according to an embodiment of the utility model is schematically shown.

[0044] refer to Figure 7-8As 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 7 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 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.

[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. Fig. 9 As shown, in the present invention, due to the limitation of the tunnel height, the main hook main beam of the trolley frame in the present invention adopts a double main beam design with an equal cross-section and a height equal to the auxiliary 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] Fig.10 This is the layout diagram of the main trolley and auxiliary trolley when used as lifting equipment during production.

[0048] 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.

[0049] refer to Fig.10 As shown, in the production state, 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.

[0050] The lifting height of the large-tonnage crane of the utility model is 24 meters in production. The length of the wire rope of the main hoist is longer than that in construction, and the wire rope basically covers the entire main hoist 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.

[0051] exist Figure 2 , Figure 3 , Figure 4 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 (hereinafter referred to as the auxiliary hook group) 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.

[0052] Figure 11-13 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.

[0053] refer to Fig.13 As 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.

[0054] Two groups of installation positions are set on the first main beam 251 and the second main beam 252 of the main trolley, which are used for the installation of the main hoisting device, the main reducer, and the two fixed pulley blocks 241 in the two states of construction and production respectively. When the main trolley is converted from the shield machine construction state to the production state, the motor, reducer, brake, hoisting device, height sensor and other devices need to be translated to one side of the small lifting mechanism by a distance T. 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 block 241.

[0055] 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.

[0056] 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.

[0057] In production mode, since the lifting height of the hook can be relatively 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 device and height sensor of the main lifting mechanism of the main and auxiliary trolleys are all assembled in the second installation position.

[0058] Fig.14 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.

[0059] refer to Figure 6 and Fig.14As shown, the main lifting mechanism of the main and auxiliary trolleys used in the construction state and the production state are different. The main lifting mechanism of the main and auxiliary trolleys used in the construction state includes a balance wheel 243 and a balance wheel support 53, and the balance wheel 243 is relied on to keep the left and right balance of the wire rope. Fig.14 As shown, the main lifting mechanism of the main and auxiliary trolleys in the production state 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 a left winding section 541 that bypasses the left section of the main hoist drum, a front fixed pulley section 611 that bypasses the front fixed pulley group, and a front movable pulley section 621 that bypasses the front movable pulley group; the right section of the wire rope 271 includes a rear movable pulley section 622 that bypasses the rear movable pulley group, a rear fixed pulley section 612 that bypasses the rear fixed pulley group, and a 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.

[0060] The structural features of the fixed pulley block of a large-tonnage crane of the utility model are as follows: compared with the number of pulleys in a traditional pulley block, 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 two side pulleys (far away from the end of the winch device) do not work when used in construction (no wire rope is wound), and the two side pulleys 245 are used together as balance wheels when used in production.

[0061] The auxiliary trolley 222 is converted from the shield machine construction state to the production state. The conversion and installation method of the motor, reducer, brake, winch device, height sensor and other devices on it is basically the same as the main trolley 221, and will not be repeated.

[0062] 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.

[0063] The conversion of construction tense into production tense includes the following steps:

[0064] Step 1. Release the lower limit protection of the hook descent and lower the hook assembly to the ground and secure it.

[0065] Step 2. Remove the wire ropes of the main and auxiliary trolleys’ main lifting mechanisms.

[0066] Step 3. Remove the balance wheel device and balance wheel support configured during construction.

[0067] Step 4. Loosen the connecting bolts between the fixed pulley block and the trolley frame, rotate the two sets of fixed pulley blocks 90° respectively, and install them on the main beam of the trolley frame respectively. There is a distance A between the centers of the two sets of fixed pulleys in the direction perpendicular to the pulley axis.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] Figure 15-17 The frame structure of the main trolley of a large-tonnage crane according to one embodiment of the utility model is schematically shown.

[0072] refer to Figure 15-17 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. 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.

[0073] 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.15As 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 first main beam 251, so as to protect the safety of workers when they are performing maintenance and repair on the crane. Fig.16 As shown, when the crane is in production, 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 and will not hinder the installation of the drum.

[0074] 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.

[0075] 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.17 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.

[0076] 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. Compact trolley frame for bridge crane, characterized in that: It includes a first main beam and a second main beam parallel to each other, and two auxiliary beams connecting two ends of the first main beam and the second main beam; The first main beam and the second main beam are provided with gaps for the wire rope or hook assembly of the crane to pass through; 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.

2. The compact trolley frame of the bridge crane according to claim 1, 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.

3. The compact trolley frame of the bridge crane according to claim 1, characterized in that: The first guard plate on the outer side of the first main beam is provided with a first through hole which runs vertically through the first guard plate for the steel wire rope of the main winch of the bridge crane to pass through.

4. The compact trolley frame of the bridge crane according to claim 3, characterized in that: Also includes a supporting beam arranged parallel to the first main beam; The supporting beam is in contact with the second main beam, and a second through hole which runs through from top to bottom is arranged on the supporting beam, and the second through hole is used for the steel wire rope of the small hoist of the bridge crane to pass through.

5. The compact trolley frame of the bridge crane according to claim 1, characterized in that: The first main beam and the second main beam are both provided with guide plates on one side opposite to the other, and the 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 hanging plate of the hook assembly of the bridge crane perpendicular to the first main beam and the second main beam; The distance between the lower ends of the opposite inclined planes is greater than the maximum dimension of the hanging plate of the hook assembly of the bridge crane perpendicular to the first main beam and the second main beam.

6. The compact trolley frame of the bridge crane according to claim 5, characterized in that: The guide plate comprises a guide web and a wing plate; One side of the 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 guide web is an inclined surface provided with a wing plate.

7. The compact trolley frame of the bridge crane according to claim 1, characterized in that: The two ends of the first main beam and the second main beam are plugged into the two ends of the auxiliary beam, and the upper surfaces of the first main beam and the second main beam are flush with the upper surface of the auxiliary beam.

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