Bridge crane with optimized girder stiffening rib arrangement structure

Abstract

The invention relates to the technical field of hoisting and transporting machinery, and particularly discloses a bridge crane with an optimized girder stiffening rib arrangement structure, which comprises a plurality of box-type girders, the box-type girders are spliced to form a girder, each box-type girder comprises a frame I, stiffening ribs are fixed in the frames I, and the stiffening ribs are fixed in the frame II. Two rib plates which are symmetrically arranged based on the first frame are fixedly installed between the stiffening ribs and the inner wall of the first frame, a cross plate is arranged between the two rib plates, hinge blocks are slidably connected to the four ends of the cross plate, hinge rods are hinged to the hinge blocks, the other ends of the hinge rods are jointly hinged to a threaded sleeve, and the threaded sleeve is fixedly connected with the cross plate. The multiple threaded sleeves are jointly in threaded connection with a threaded column. A sliding column is fixed to the end, close to the middle of the main beam, of the cross plate, and the two ends of the sliding column are slidably connected with the two sides of the rib plate. The problem that weight and strength of a main beam of a traditional bridge crane cannot be considered at the same time is solved.

Description

Technical Field

[0001] This invention relates to the field of lifting and transport machinery technology, and in particular to a bridge crane with an optimized arrangement of stiffening ribs on the main beam. Background Technology

[0002] Bridge cranes, as indispensable heavy equipment in industrial production, are widely used in material handling, loading and unloading operations. The main beam, as the core load-bearing structure of the bridge crane, directly determines the crane's overall load-bearing capacity and operational stability. In actual operation, the main beam frequently lifts heavy objects such as engines, bearing not only enormous loads but also dynamically changing loads, placing extremely high demands on the strength and rigidity of the main beam.

[0003] Traditional bridge crane main beam designs often employ methods like increasing material thickness or enlarging structural dimensions to meet strength requirements. While this improves load-bearing capacity to some extent, it also introduces numerous drawbacks. Firstly, the increased weight of the main beam significantly raises the overall weight of the crane, increasing energy consumption and placing a greater burden on the crane's support structure and operating components, accelerating wear and tear, and shortening its service life. Secondly, simply relying on increasing material to enhance strength fails to fully utilize the material's mechanical properties, resulting in material waste and failing to meet modern industry's pursuit of lightweight and high-efficiency design.

[0004] Furthermore, when the main beam is under load, tensile stress will be generated inside it. When the tensile stress exceeds a certain limit, the main beam will deform or even break, seriously affecting the safe operation of the crane. Although there are some studies on the optimization of the main beam structure in the existing technology, most of them only focus on the improvement of local structures and fail to systematically solve the contradiction between the strength, stiffness and lightweight of the main beam as a whole, nor can they effectively deal with the deformation problem of the main beam under complex loads.

[0005] Therefore, a bridge crane with an optimized arrangement of stiffening ribs on the main beam is proposed to solve the problem that the weight and strength of the main beam cannot be balanced in traditional bridge cranes. Summary of the Invention

[0006] The purpose of this invention is to propose a bridge crane with an optimized arrangement of stiffening ribs on the main beam, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A bridge crane with an optimized arrangement of stiffening ribs in its main girder includes box girders, wherein several box girders are spliced ​​together to form the main girder. The box girder includes a frame, within which stiffening ribs are fixed. Two rib plates, symmetrically arranged based on the frame, are fixedly installed between the stiffening ribs and the inner wall of the frame. A cross plate is provided between the two rib plates. The cross plate is slidably connected to four ends with hinge blocks, and hinge rods are hinged to the hinge blocks. The other end of each hinge rod is hinged to a threaded sleeve, and several threaded sleeves are threadedly connected to a threaded post. A sliding column is fixed at one end of the cross plate near the middle of the main beam, and the two ends of the sliding column are slidably connected to the two sides of the rib plate. The bottom of the two frames in the middle section is provided with a common installation groove. A force-bearing block is provided in the installation groove. Multiple symmetrical through grooves are opened below the force-bearing block from its own center toward both ends of the main beam. The through grooves are evenly spaced and their extension direction is consistent with the length direction of the main beam. Several mounting plates are fixed along the length of the main beam. The mounting plates are symmetrical about each other with the stress block as the center. The top of the mounting plate is fixed to the bottom of the frame. Two jacks are fixed to the bottom of each mounting plate. The jacks on the same side are not on the same axis and are arranged in an alternating manner. The positions of the jacks are symmetrically arranged in pairs on the force-bearing blocks, and the output ends of the corresponding jacks are all fixed with a steel bar. The diameter of the steel bar is adapted to the width of the through groove. Several steel bars are embedded in the through groove one by one. The two ends of the steel bars are flush with the ends of the through groove and fit against the inner wall of the force-bearing blocks.

[0008] Preferably, the end of the cross plate does not contact the box beam while providing sliding space for the hinge block so that the hinge block provides support for the box beam and stiffening ribs.

[0009] Preferably, a fixed prestressed tensioning anchor is fixed to the top of the stress block, the bottom of the cylinder of the fixed prestressed tensioning anchor is fixed to the center of the stress block, and a support column is fixed to the piston rod end, the support column being arranged horizontally; The bottom of the support column is fixedly connected to the top of the piston rod of the fixed prestressed tensioning anchor. Sliding seats are slidably connected to both ends of the support column. The two sliding seats are attached to the inner wall of the frame and fixed to the stiffening rib.

[0010] Preferably, the support column has a through hole, the inner diameter of which is larger than the outer diameter of the threaded column, so that the support column is sleeved on the threaded column through the through hole.

[0011] Preferably, the main beam further includes a connecting beam, which is spliced ​​and fixed at both ends of the main beam. The connecting beam includes a second frame, which is spliced ​​and fixed to the first frame of the box beam on both sides.

[0012] Preferably, the second frame has a second mounting groove on the side near the first frame, and a mounting cover is fixed along the periphery of the second mounting groove. Connectors are symmetrically fixed on the inner walls of both sides of the mounting cover, and a sliding groove is formed through the end face of the connector.

[0013] Preferably, a sliding plate is fitted into the second mounting groove with a clearance fit. An ear plate is fixed to the side of the sliding plate near the mounting cover based on central symmetry. A connecting rod is fixed to the outer wall of the ear plate. The connecting rod slides and rotates within the sliding groove.

[0014] Preferably, the second frame is generally trapezoidal in shape, and the end face size of the side closest to the first frame matches that of the first frame; a connecting block is fixedly provided at the end of the second frame away from the first frame, and the connecting block is used to fixally connect to the top of the crane end beam.

[0015] Preferably, a motor is fixed on the sliding plate of one of the connecting beams, the motor is located inside the second frame, and the output end of the motor passes through the sliding plate and is fixedly connected to the threaded column.

[0016] Preferably, the rib plate is fixedly installed on the inner periphery of the frame and fixedly connected to the outer wall of the stiffening rib, forming a U-shaped structure that encloses the stiffening rib. The stiffening rib and the rib plate together form a load-bearing frame.

[0017] The beneficial effects of this invention are as follows: By applying prestress inside and outside the main beam, this invention generates compressive stress in the beam when it is under load. When the main beam is under load, the prestress is in the opposite direction to the working stress, and part of the working pressure is offset by the prestress, thereby significantly improving the load-bearing capacity of the main beam. At the same time, the optimized arrangement of stiffening ribs and rib plates together form a load-bearing frame, further enhancing the structural strength of the main beam, enabling it to better cope with complex working conditions such as lifting heavy objects. This invention, while ensuring sufficient load-bearing capacity of the main beam, optimizes material distribution and utilization through reasonable structural design and prestressing technology. It avoids the traditional approach of simply increasing material thickness to improve strength, effectively reducing the main beam's self-weight. This not only reduces the crane's overall energy consumption but also reduces the burden on the supporting structure and operating components, extending the equipment's service life, while meeting modern industrial requirements for lightweighting, energy conservation, and environmental protection. A load-bearing block is installed in the middle of the main beam, and reinforcing bars are embedded into the through groove of the block using mounting plates and jacks. Simultaneously, fixed prestressed tensioning anchors apply pressure to the load-bearing block, creating strong support at the center of the main beam. This central support reinforcement design further enhances the load-bearing capacity of the main beam in critical areas, effectively disperses the load on the main beam, reduces stress concentration, and enhances the overall stability of the main beam. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the framework structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the mounting plate arrangement structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the framework according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the installation position of the mounting cover according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the connecting beam structure according to an embodiment of the present invention.

[0019] In the diagram: 1. Box girder; 101. Frame 1; 102. Stiffening rib; 103. Rib plate; 104. Cross plate; 1041. Hinge block; 1042. Hinge rod; 105. Sliding column; 106. Threaded sleeve; 107. Threaded column; 108. Mounting groove 1; 109. Load-bearing block; 1091. Through groove; 110. Mounting plate; 111. Jack; 112. Fixed prestressed tensioning anchor; 113. Support column; 1131. Through hole; 114. Sliding seat; 115. Reinforcing bar; 2. Main beam; 3. Connecting beam; 301. Frame 2; 302. Mounting groove 2; 3021. Sliding plate; 3022. Ear plate; 3023. Connecting rod; 303. Mounting cover; 3031. Connector; 3032. Sliding groove; 304. Motor; 305. Connecting block. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] When a bridge crane lifts and transports heavy objects, the main girder serves as the core load-bearing structure. Because the main girder frequently lifts heavy objects such as engines, it needs to balance high strength and lightweight characteristics. This solution applies prestressing both inside and outside the main girder, generating compressive stress in the girder under load, thus enhancing its load-bearing capacity. When the main girder bears a load, the prestressing is in the opposite direction to the working stress, partially offsetting the working pressure and thereby improving the main girder's load-bearing capacity. The specific solution is as follows.

[0022] Reference Figures 1-6 A bridge crane with an optimized arrangement of stiffening ribs on the main beam includes a box girder 1. Several box girders 1 are sealed and spliced ​​together by splicing parts to form a main beam 2. The splice joints are fixed with high-strength bolts to ensure the overall stability and load-bearing consistency of the main beam 2.

[0023] The box girder 1 includes a rectangular frame 101, which is a welded steel plate structure. Stiffening ribs 102 are fixedly installed inside the frame 101. Two rib plates 103 are fixedly installed between the stiffening ribs 102 and the inner wall of the frame 101. The rib plates 103 are fixedly installed on the inner periphery of the frame 101 and fixedly connected to the outer wall of the stiffening ribs 102. The whole structure is in the shape of a U-shape, which encloses the stiffening ribs 102. The stiffening ribs 102 and the rib plates 103 together form a load-bearing frame.

[0024] A cross plate 104 is provided between the two ribs 103. Each of the four ends of the cross plate 104 is provided with a sliding rail. A hinge block 1041 is slidably connected to each sliding rail. A wear-resistant pad is provided between the hinge block 1041 and the sliding rail to reduce sliding wear.

[0025] The hinge block 1041 is hinged to a hinge rod 1042 via a hinge shaft. The other ends of the four hinge rods 1042 are hinged to the outer wall of the same threaded sleeve 106. Several threaded sleeves 106 are evenly distributed along the length of the main beam 2 and are connected by a threaded post 107 that runs through the entire main beam 2.

[0026] After prestressing is applied to the main beam 2, when the main beam 2 bears the load and begins to deflect, it is necessary to provide it with a reverse support force.

[0027] Specifically: By rotating the threaded column 107, the threaded sleeve 106 connected to it slides towards the cross plate 104, reducing the distance between the threaded sleeve 106 and the cross plate 104. This changes the tilt angle of the four hinge rods 1042 that are hinged to it, thereby causing the four hinge blocks 1041 to slide towards the four ends of the cross plate 104 until the hinge blocks 1041 contact the inner wall of the box girder 1 and the stiffening ribs 102, providing internal support for the main girder 2. While the main girder 2 arches upward, the threaded column 107 remains horizontal, thus forming a stiffness adjustment device through the supporting force of the hinge blocks 1041.

[0028] A sliding column 105 is vertically fixed at one end of the cross plate 104 near the middle of the main beam 2. A sliding through hole matching the sliding column 105 is opened at the corresponding position of the rib plate 103. Both ends of the sliding column 105 pass through the sliding through hole of the corresponding rib plate 103 and are slidably connected to the sliding through hole. Both ends of the sliding column 105 are provided with limit blocks to prevent it from detaching from the rib plate 103 during sliding. The bottom of the two frames 101 located in the middle of the main beam 2 is provided with a rectangular mounting groove 108. The size of the mounting groove 108 is adapted to the force-bearing block 109. The force-bearing block 109 is provided in the mounting groove 108. The force-bearing block 109 is made of high-strength alloy material. Multiple symmetrically distributed through grooves 1091 are opened below it from its own center towards both ends of the main beam 2. The through grooves 1091 are evenly spaced and their extension direction is consistent with the length direction of the main beam 2. Several mounting plates 110 are fixed along the length of the main beam 2. The mounting plates 110 are symmetrical about each other with the stress block 109 as the center. The top of the mounting plate 110 is detachably fixed to the bottom of the frame 101 by bolts. Two jacks 111 are fixedly installed at the bottom of each of the mounting plates 110. The jacks 111 on the same side are not on the same axis and are arranged in a staggered manner to ensure that no interference occurs when prestressing is applied. The positions of the jacks 111, which are symmetrically arranged in pairs on the force-bearing blocks 109, correspond one-to-one, and the output ends of the corresponding jacks 111 are all fixed with a steel bar 115. Several steel bars 115 are embedded one-to-one in the through grooves 1091. The two ends of the steel bars 115 are flush with the ends of the through grooves 1091 and fit against the inner wall of the force-bearing blocks 109, further improving the load-bearing capacity of the force-bearing blocks 109.

[0029] Before using the bridge crane, prestress is applied to the main beam 2.

[0030] At this time, by activating the jacks 111 located on both sides, a pulling force is applied to the steel bar 115 between the two jacks 111 in the opposite direction to the force-bearing block 109. At this time, the jacks 111 are regarded as part of the main beam 2.

[0031] Due to the interaction of forces, while the main beam 2 applies tension to the reinforcing bar 115, the reinforcing bar 115 applies prestress to both sides of the main beam 2 in the direction of the stress block 109. At this time, a downward pressure is applied to the stress block 109, and a force is generated between the stress block 109 and the reinforcing bar 115. Considering the stress block 109 as part of the main beam 2, the main beam 2 is subjected to the vertical upward support force of the reinforcing bar 115 while applying downward pressure to the reinforcing bar 115. At this time, the main beam 2 arches upward under the action of prestress and support force, thus completing the application of prestress.

[0032] In some preferred embodiments, the end of the cross plate 104 does not contact the box beam 1 while providing sufficient sliding space for the hinge block 1041 so that the hinge block 1041 can provide support for the box beam 1 and the stiffening rib 102.

[0033] In some preferred embodiments, a fixed prestressed tensioning anchor 112 is fixed to the top of the force-bearing block 109. The bottom of the cylinder of the fixed prestressed tensioning anchor 112 is fixed to the center of the force-bearing block 109, and a support column 113 is fixed to the piston rod end. The support column 113 is arranged horizontally. The bottom of the support column 113 is fixedly connected to the top of the piston rod of the fixed prestressed tensioning anchor 112. Sliding seats 114 are slidably connected to both ends of the support column 113. The two sliding seats 114 are attached to the inner wall of the frame 101 and fixed to the stiffening rib 102. The fixed prestressed tensioning anchor 112 drives the force-bearing block 109 to rise and fall, thereby applying pressure to the steel bar 115, and then applying a supporting force to the main beam 2 at the center of the main beam 2, assisting the main beam 2 to arch upward.

[0034] In some preferred embodiments, a through hole 1131 is provided on the support column 113. The inner diameter of the through hole 1131 is larger than the outer diameter of the threaded column 107, so that the support column 113 is sleeved on the threaded column 107 through the through hole 1131, avoiding interference between the support column 113 and the threaded column 107 during the movement of the threaded column 107, and ensuring the smooth operation of the structure.

[0035] In some preferred embodiments, the main beam 2 further includes a connecting beam 3, which is spliced ​​and fixed at both ends of the main beam 2. The connecting beam 3 includes a second frame 301, which is spliced ​​and fixed to the first frame 101 of the box beam 1 on both sides. The second frame 301 has a second mounting groove 302 on the side near the first frame 101. A mounting cover 303 is fixed along the periphery of the second mounting groove 302. Connectors 3031 are symmetrically fixed on the inner walls of both sides of the mounting cover 303. A sliding groove 3032 is opened through the end face of the connector 3031. A sliding plate 3021 is fitted into the mounting groove 302 with a clearance. An ear plate 3022 is fixed to the side of the sliding plate 3021 near the mounting cover 303 based on central symmetry. A connecting rod 3023 is fixed to the outer wall of the ear plate 3022. The connecting rod 3023 slides and rotates within the sliding groove 3032.

[0036] In some preferred embodiments, the second frame 301 is generally trapezoidal in shape, and the end face size of the side of the second frame 301 close to the first frame 101 matches the first frame 101, which facilitates docking and splicing; a connecting block 305 is fixedly provided at the end of the second frame 301 away from the first frame 101, and the connecting block 305 is used to fixally connect to the top of the crane end beam.

[0037] In some preferred embodiments, a motor 304 is fixed on the sliding plate 3021 of one of the connecting beams 3. The motor 304 is located inside the frame 301, and the output end of the motor 304 passes through the sliding plate 3021 and is fixedly connected to the threaded column 107.

[0038] When the main beam 2 is in the prestressed arched state, the main beam 2 is an axisymmetric parabolic shape. Therefore, the connecting beams 3 on both sides of the main beam 2 are on the same horizontal plane. During the arching process of the main beam 2, the connecting beams 3 tilt, and the sliding plate 3021 rotates relative to the connecting beams 3 to ensure the horizontal state of the threaded column 107.

[0039] In some preferred embodiments, the working conditions of each component of the main beam 2 under prestressed state are simulated. After the main beam 2 arches upward under prestress to a fixed height, the horizontal plane where the threaded column 107 is located is set as the initial horizontal plane. Since the support column 113 and the sliding column 105 can slide up and down relative to the box beam 1, the threaded column 107, the support column 113 and the sliding column 105 have the condition of being simultaneously on the initial horizontal plane. The support column 113 and the sliding column 105 are set to the limit sliding position, that is, they cannot slide downward. Thus, when the main beam 2 is under prestressed state, the support column 113 and the sliding column 105 are in the limit sliding position, which can provide support force for the threaded column 107 and prevent the threaded column 107 from bending and deforming due to its own weight, causing the threaded sleeve 106 to get stuck.

[0040] Working principle: This scheme applies prestress inside and outside the main beam 2, causing compressive stress in the beam when it is under load, thereby improving its load-bearing capacity. The following is a detailed explanation: Initial state and prestress application Before using the bridge crane, prestress must be applied to the main beam 2. At this time, the jacks 111 located on both sides are activated, applying a tensile force to the reinforcing bars 115 located between the two jacks 111 in the opposite direction to the load-bearing block 109. Due to the interaction of forces, while the main beam 2 applies tensile force to the reinforcing bars 115, the reinforcing bars 115 simultaneously apply prestress to both sides of the main beam 2 in the direction of the load-bearing block 109. Simultaneously, by activating the fixed prestressing tensioning anchor 112, downward pressure is applied to the load-bearing block 109. An interaction force is generated between the load-bearing block 109 and the reinforcing bars 115. While the main beam 2 applies downward pressure to the reinforcing bars 115, it also receives an upward vertical support force from the reinforcing bars 115. At this point, the main beam 2 arches upward under the action of prestress and support force, completing the application of prestress.

[0041] After the prestressing is applied, the main beam 2 is in an upward arched state, and the whole is in an axisymmetric parabolic shape. At this time, the load-bearing blocks 109 at the bottom of the two frames 101 located in the middle of the main beam 2 are fixed to the bottom of the frames 101 by the mounting plate 110. The jack 111 is fixed to the bottom of the mounting plate 110, and the steel bar 115 fixed at its output end is embedded in the through groove 1091 of the load-bearing block 109, which improves the load-bearing capacity of the load-bearing block 109.

[0042] Structural changes and functions during load-bearing process When the bridge crane lifts a heavy object, the main beam 2 bears the load. At this time, the prestress is opposite to the working stress, and part of the working pressure is offset by the prestress, thereby improving the load-bearing capacity of the main beam 2.

[0043] Meanwhile, the degree of camber of the main beam 2 may change under the action of bending moment. At this time, by rotating the threaded column 107, the threaded sleeve 106 connected to it slides towards the cross plate 104, reducing the distance between the threaded sleeve 106 and the cross plate 104. This changes the inclination angle of the four hinge rods 1042 that are hinged to it, causing the four hinge blocks 1041 to slide towards the four ends of the cross plate 104 respectively, until the hinge blocks 1041 contact the inner wall of the box beam 1 and the stiffening ribs 102, providing internal support for the main beam 2. While the main beam 2 cambers, the threaded column 107 remains horizontal, and the supporting force of the hinge blocks 1041 maintains the state of the main beam 2.

[0044] During the arching process of the main beam 2, the connecting beam 3 tilts, and the sliding plate 3021 rotates relative to the connecting beam 3, ensuring that the threaded column 107 is always in a horizontal state and ensuring the stable operation of the entire structure.

[0045] Status after uninstallation After the bridge crane completes the lifting and unloading of the heavy object, the load on the main beam 2 decreases, but it still maintains a certain prestress state, which allows the main beam 2 to quickly enter a stable working state when it is loaded again, reducing structural deformation and extending the service life of the main beam 2.

[0046] In summary, the optimized arrangement of stiffening ribs on the main beam of this bridge crane effectively improves the load-bearing capacity of the main beam 2 through a series of mechanisms, including prestressing, internal support adjustment, central support reinforcement, and adaptation adjustment of connecting beam 3, adapting to the usage requirements under different working conditions and ensuring the safe and stable operation of the bridge crane.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bridge crane with an optimized arrangement of stiffening ribs on the main beam, characterized in that, Includes box girders, and several of these box girders are spliced ​​together to form a main beam. The box girder includes a frame, within which stiffening ribs are fixed. Two rib plates, symmetrically arranged based on the frame, are fixedly installed between the stiffening ribs and the inner wall of the frame. A cross plate is provided between the two rib plates. The cross plate is slidably connected to four ends with hinge blocks, and hinge rods are hinged to the hinge blocks. The other end of each hinge rod is hinged to a threaded sleeve, and several threaded sleeves are threadedly connected to a threaded post. A sliding column is fixed at one end of the cross plate near the middle of the main beam, and the two ends of the sliding column are slidably connected to the two sides of the rib plate. The bottom of the two frames in the middle section is provided with a common installation groove. A force-bearing block is provided in the installation groove. Multiple symmetrical through grooves are opened below the force-bearing block from its own center toward both ends of the main beam. The through grooves are evenly spaced and their extension direction is consistent with the length direction of the main beam. Several mounting plates are fixed along the length of the main beam. The mounting plates are symmetrical about each other with the stress block as the center. The top of the mounting plate is fixed to the bottom of the frame. Two jacks are fixed to the bottom of each mounting plate. The jacks on the same side are not on the same axis and are arranged in an alternating manner. The positions of the jacks are symmetrically arranged in pairs on the force-bearing blocks, and the output ends of the corresponding jacks are all fixed with a steel bar. The diameter of the steel bar is adapted to the width of the through groove. Several steel bars are embedded in the through groove one by one. The two ends of the steel bars are flush with the ends of the through groove and fit against the inner wall of the force-bearing blocks.

2. The bridge crane with an optimized arrangement of main beam stiffening ribs according to claim 1, characterized in that, The ends of the cross plate do not contact the box beam, while providing sliding space for the hinge block so that the hinge block provides support for the box beam and stiffening ribs.

3. A bridge crane with an optimized arrangement of stiffening ribs on the main beam according to claim 1, characterized in that, A fixed prestressed tensioning anchor is fixed to the top of the stress block. The bottom of the cylinder of the fixed prestressed tensioning anchor is fixed to the center of the stress block, and a support column is fixed to the piston rod end. The support column is arranged horizontally. The bottom of the support column is fixedly connected to the top of the piston rod of the fixed prestressed tensioning anchor. Sliding seats are slidably connected to both ends of the support column. The two sliding seats are attached to the inner wall of the frame and fixed to the stiffening rib.

4. A bridge crane with an optimized arrangement of main beam stiffening ribs according to claim 3, characterized in that, The support column has a through hole, the inner diameter of which is larger than the outer diameter of the threaded column, so that the support column is sleeved on the outside of the threaded column through the through hole.

5. A bridge crane with an optimized arrangement of stiffening ribs on the main beam according to claim 1, characterized in that, The main beam also includes a connecting beam, which is spliced ​​and fixed at both ends of the main beam. The connecting beam includes a second frame, which is spliced ​​and fixed to the first frame of the box beam on both sides.

6. A bridge crane with an optimized arrangement of main beam stiffening ribs according to claim 5, characterized in that, The second frame has a second mounting groove on the side near the first frame. A mounting cover is fixed along the periphery of the second mounting groove. Connectors are symmetrically fixed on the inner walls of both sides of the mounting cover. A sliding groove is opened through the end face of the connector.

7. A bridge crane with an optimized arrangement of main beam stiffening ribs according to claim 6, characterized in that, The mounting groove 2 is fitted with a sliding plate with a clearance fit. The sliding plate is fixed with an ear plate on the side near the mounting cover based on central symmetry. A connecting rod is fixed on the outer wall of the ear plate. The connecting rod slides and rotates within the sliding groove.

8. A bridge crane with an optimized arrangement of main beam stiffening ribs according to claim 7, characterized in that, The overall shape of the second frame is trapezoidal, and the end face size on the side close to the first frame matches that of the first frame; a connecting block is fixedly arranged at one end of the second frame far from the first frame, and the connecting block is used for fixedly connecting with the top of the crane end beam.

9. A bridge crane with an optimized arrangement of stiffening ribs on the main beam according to claim 8, characterized in that, A motor is fixed on the sliding plate of one of the connecting beams. The motor is located inside the second frame, and the output end of the motor penetrates through the sliding plate and is fixedly connected with the threaded column.

10. A bridge crane with an optimized arrangement of main beam stiffening ribs according to claim 1, characterized in that, The rib plates are fixedly installed on the peripheral side of the inner wall of the first frame and are fixedly connected with the outer wall of the stiffening ribs. The overall shape is a square structure with a hole in the middle, wrapping the stiffening ribs inside. The stiffening ribs and the rib plates together form a load-bearing frame.

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