A main girder connecting structure of a bridge crane

Abstract

This invention relates to the field of lifting machinery technology, specifically disclosing a main end beam connection structure for a bridge crane, including a main beam end connecting plate and an end beam end connecting plate. The structure further includes: a convex wedge block and a concave wedge groove, wherein the convex wedge block is fixed to the main beam end connecting plate, and the concave wedge groove is fixed to the end beam end connecting plate, with the shapes of the convex wedge block and the concave wedge groove being complementary and mutually wedging; and an eccentric locking assembly disposed on the side of the main beam end connecting plate away from the end beam end connecting plate, the eccentric locking assembly including an eccentric shaft rotatably connected to the main beam end connecting plate, a locking handle fixedly connected to the eccentric shaft, and a clamping block sleeved on the eccentric section of the eccentric shaft, the clamping block abutting against the outer surface of the end beam end connecting plate; this design addresses the problems of difficult positioning and poor anti-loosening performance in traditional connection structures.

Description

Technical Field

[0001] This invention relates to the field of lifting machinery technology, and in particular to a main end beam connection structure for a bridge crane. Background Technology

[0002] In the design and manufacturing of bridge cranes, the connection structure between the main beam and the end beams is a key factor affecting the overall performance, installation efficiency, and operational reliability of the crane. Traditionally, the main beam and end beams of bridge cranes are connected using bolts, but this method has many problems in practical applications.

[0003] During installation, the lack of an effective automatic positioning mechanism necessitates precise measurement and repeated adjustments to the relative positions of the main beam and end beams to ensure accurate alignment in both horizontal and vertical directions. This process is not only time-consuming and labor-intensive, requiring a high level of skill from the installers, but also makes it difficult to guarantee ideal precision on every installation. This can easily lead to initial stress in the connected structure, affecting the crane's service life and operational stability.

[0004] Bridge cranes are subjected to frequent vibration and impact loads during operation, and traditional bolted connections are prone to loosening under such dynamic loads. To prevent loosening, complex anti-loosening measures are typically employed, such as double nuts and spring washers. However, these methods cannot completely eliminate the possibility of bolt loosening. Once bolts loosen, the connection gap between the main beam and the end beam increases, affecting the crane's structural strength and operational safety, and in severe cases, potentially leading to accidents.

[0005] During manufacturing and installation, various factors, such as machining errors of components and deviations in installation benchmarks, may introduce errors in the connection gap between the main beam and the end beam. Traditional bolted connections cannot precisely fine-tune this gap; adjustments can only be made roughly by adding or removing shims, which is insufficient to meet the requirements of high-precision connections. This not only affects the smooth operation of the crane but also increases wear on components and reduces the equipment's lifespan.

[0006] Furthermore, existing connection structures lack an effective automatic compensation mechanism to address the issues of loosening and increased gaps caused by vibration, wear, and other factors during long-term use. This necessitates regular manual tightening and adjustment, increasing maintenance costs and workload.

[0007] Therefore, a new main end beam connection structure for bridge cranes is proposed to solve the problems of difficult positioning and poor anti-loosening performance of traditional connection structures. Summary of the Invention

[0008] The purpose of this invention is to provide a main end beam connection structure for a bridge crane to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A main end beam connection structure for a bridge crane, comprising a main beam end connecting plate and an end beam end connecting plate, characterized in that it further comprises: A convex wedge block and a concave wedge groove are provided. The convex wedge block is fixed to the end connecting plate of the main beam, and the concave wedge groove is fixed to the end connecting plate of the end beam. The convex wedge block and the concave wedge groove are complementary in shape and wedge with each other. An eccentric locking assembly is disposed on the side of the main beam end connecting plate away from the end beam end connecting plate. The eccentric locking assembly includes an eccentric shaft rotatably connected to the main beam end connecting plate, a locking handle fixedly connected to the eccentric shaft, and a clamping block sleeved on the eccentric section of the eccentric shaft. The clamping block abuts against the outer side of the end beam end connecting plate. An anti-loosening locking assembly is connected to the eccentric shaft. The anti-loosening locking assembly includes a ratchet disk fixedly connected to the eccentric shaft and a pawl rotatably connected to the end connecting plate of the main beam. The pawl meshes with a one-way helical tooth on the outer circumference of the ratchet disk. The gap compensation assembly includes an elastic compensation shim sandwiched between the end connecting plate of the main beam and the end connecting plate of the end beam, and a disc spring assembly sleeved on the eccentric section, one end of the disc spring assembly abutting against the shoulder of the eccentric section, and the other end abutting against the annular step inside the clamping block.

[0010] Preferably, the convex wedge block is a trapezoidal cross-section protrusion, the width and height of which gradually increase along the insertion direction, and the front end of the convex wedge block is provided with a guide arc; the concave wedge groove is a trapezoidal groove body that is complementary to the shape of the convex wedge block, and the inner wall of the concave wedge groove is fitted with a self-lubricating wear-resistant liner.

[0011] Preferably, two sets of convex wedge blocks and concave wedge grooves are symmetrically arranged, and the two sets of convex wedge blocks and the two sets of concave wedge grooves are respectively wedge-fitted.

[0012] Preferably, a conical sleeve is fixed in the middle of the eccentric section, and the inner hole of the clamping block is provided with a conical surface that cooperates with the conical sleeve, and a gap is left between the conical surface and the outer surface of the eccentric section.

[0013] Preferably, the eccentric locking assembly is further provided with an anti-rotation guide structure, which restricts the clamping block from rotating synchronously with the eccentric shaft.

[0014] Preferably, two bearing seats are fixedly arranged on the outer side of the main beam end connecting plate, and the two ends of the eccentric shaft are respectively rotatably installed in the two bearing seats.

[0015] Preferably, the locking handle is provided with anti-slip texture and force-applying holes; and the end face of the clamping block facing the end beam end connecting plate is provided with a wear-resistant pad.

[0016] Preferably, the pawl is rotatably mounted on the end connecting plate of the main beam via a pawl shaft, a pawl spring is provided between the pawl and the end connecting plate of the main beam, and a manual unlocking pull ring is provided at the tail of the pawl.

[0017] Preferably, it also includes a connection status indicator, which includes an indicator disk fixed to the end of the eccentric shaft and an observation window opened on the end connecting plate of the main beam. The indicator disk is provided with "locked" and "unlocked" markings, and the position of the observation window corresponds to the markings.

[0018] In another aspect, the present invention includes a main beam and an end beam, and further includes a bridge crane main end beam connection structure as described in any one of claims 1-9, wherein the main beam and the end beam are detachably and fixedly connected through the bridge crane main end beam connection structure.

[0019] The beneficial effects of this invention are as follows: Through the design of the wedge-shaped positioning component, this invention utilizes the wedge effect of the convex wedge block and the concave wedge groove to automatically achieve forced alignment of the main beam end connecting plate and the end beam end connecting plate in the horizontal direction (crane span direction) and the vertical direction (lifting height direction) when they approach each other axially. The guide arc at the front end of the convex wedge block further facilitates automatic correction during insertion. Even if there is a slight deviation in initial alignment, it can be automatically adjusted during insertion, greatly simplifying the installation process, improving installation accuracy, reducing installation time, and reducing reliance on the skill level of the installation workers. The combination of the eccentric locking assembly and the anti-loosening locking assembly forms a double anti-loosening guarantee. The eccentric locking assembly utilizes the force-amplifying effect of the eccentric mechanism to generate a large axial clamping force with a small handle operation force, ensuring a tight fit between the two connecting plates. Simultaneously, the eccentric mechanism itself has a certain self-locking characteristic (when the eccentric angle is less than the friction angle). Building upon this, the anti-loosening locking assembly, through the cooperation of a ratchet disc and a pawl, allows rotation when the eccentric shaft rotates in the locking direction. The helical teeth of the ratchet disc push the pawl outward, allowing rotation. Conversely, when the eccentric shaft is subjected to a reverse torque (such as a loosening tendency caused by vibration), the pawl engages with the vertical surface of the helical teeth, preventing reverse rotation. This ensures that the eccentric locking assembly automatically locks after being fully engaged, requiring no additional operation. This effectively prevents the connection structure from loosening under vibration, improving the safety and reliability of the connection. Attached Figure Description

[0020] 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 front structure of the eccentric locking assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the back structure of the eccentric locking assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the ratchet disk mounting structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the eccentric locking assembly according to an embodiment of the present invention; Figure 6 This is an embodiment of the present invention. Figure 5 A magnified view of region A; Figure 7 This is a schematic diagram of the convex wedge block structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the concave wedge-shaped groove structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the observation window position in an embodiment of the present invention.

[0021] In the diagram: 100, Main beam end connecting plate; 110, Convex wedge block; 111, Guide arc; 120, Bearing seat; 130, Anti-slip tooth pattern one; 140, Observation window; 200, End beam end connecting plate; 210, Concave wedge groove; 211, Self-lubricating wear-resistant liner; 220, Anti-slip tooth pattern two; 300, Main beam; 400, End beam; 500, Eccentric locking assembly; 510, Eccentric shaft; 511, Eccentric section; 512, Shoulder; 513, Tapered sleeve; 520 Locking handle; 521 Anti-slip texture; 522 Force-applying hole; 530 Clamping block; 531 Sliding bushing; 532 Wear-resistant pad; 533 Annular step; 534 Conical surface; 540 Ratchet disc; 541 One-way helical tooth; 550 Pawl; 551 Pawl shaft; 552 Pawl spring; 553 Manual unlocking pull ring; 560 Indicator disc; 600 Clearance compensation assembly; 610 Elastic compensation pad; 620 Disc spring assembly. Detailed Implementation

[0022] 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.

[0023] Example 1 To address the technical shortcomings of existing bridge crane main beam and end beam connection structures, such as cumbersome installation and positioning, insufficient anti-loosening performance, and inability to achieve fine adjustments. Reference Figures 1 to 9As shown, this invention provides a main end beam connection structure for a bridge crane, including a main beam end connecting plate 100 and an end beam end connecting plate 200. The main beam end connecting plate 100 and the end beam end connecting plate 200 are connected to each other to form a stable connection pair. The main beam end connecting plate 100 is fixedly connected to the main beam 300, and the end beam end connecting plate 200 is fixedly connected to the end beam 400. The connection method is adapted to the overall structural strength requirements of the crane, ensuring the reliability and load-bearing capacity of the connection.

[0024] The present invention provides a wedge-shaped positioning component for achieving rapid and accurate alignment between the main beam and the end beam. The wedge-shaped positioning component is composed of a convex wedge block 110 and a concave wedge groove 210. The convex wedge block 110 and the concave wedge groove 210 are respectively fixedly arranged on the end connecting plate 100 of the main beam and the end connecting plate 200 of the end beam, forming a complementary mating structure.

[0025] The convex wedge block 110 is a trapezoidal cross-section protrusion, and its width and height gradually increase along the insertion direction to form a wedge-shaped mating surface, which achieves automatic centering by relying on the wedge effect; the front end of the convex wedge block 110 is provided with a guide arc 111, which can automatically correct the alignment deviation during the insertion process, reduce the assembly difficulty, and achieve rapid docking.

[0026] The concave wedge groove 210 is a trapezoidal groove whose shape is completely complementary to that of the convex wedge block 110. The inner wall of the groove is fitted with a self-lubricating wear-resistant liner 211. The liner is made of composite material and has a low coefficient of friction and excellent wear resistance, which can effectively reduce the friction loss of the wedge mating surface.

[0027] In this embodiment, two sets of convex wedge blocks 110 and concave wedge grooves 210 are symmetrically arranged to form a symmetrical positioning structure. When the main beam end connecting plate 100 and the end beam end connecting plate 200 approach each other along the axial direction, the convex wedge blocks 110 are inserted into the concave wedge grooves 210. With the forced guiding effect of the wedge fit, the two are simultaneously aligned in the crane span direction (horizontal direction) and lifting height direction (vertical direction), without the need for additional positioning pins or adjusting shims, which greatly simplifies the installation and positioning process.

[0028] like Figure 4 As shown, an eccentric locking assembly 500 is provided on the side of the main beam end connecting plate 100 away from the end beam 400. The eccentric locking assembly 500 is used to tightly press and fix the two mating connecting plates. The eccentric locking assembly 500 includes an eccentric shaft 510, a locking handle 520, and a pressing block 530. Two bearing seats 120 are fixedly arranged on the outer side of the main beam end connecting plate 100. The two ends of the eccentric shaft 510 are rotatably installed inside the bearing seats 120 to achieve stable rotational support and ensure smooth rotation of the eccentric shaft without radial movement.

[0029] The eccentric shaft 510 has an eccentric section 511 in the middle. The axis of the eccentric section 511 is eccentrically different from the rotation axes at both ends. Relying on the force-amplifying effect of the eccentric structure, a locking effect of generating a large clamping force with a small operating force can be achieved. The locking handle 520 is fixed to one end of the eccentric shaft 510 for easy manual operation. The locking handle 520 is provided with anti-slip texture 521 and force-applying hole 522 to assist the operator in applying force.

[0030] The clamping block 530 is sleeved on the eccentric section 511 of the eccentric shaft 510 via a sliding bushing 531. The end face of the clamping block 530 facing the end beam is in close contact with the outer side of the end connecting plate 200 of the end beam. The contact surface is provided with a wear-resistant pad 532 to reduce friction and wear during the clamping process, while improving contact stability and preventing the clamping surface from sliding.

[0031] A tapered sleeve 513 is fixed in the middle of the eccentric section 511. The inner hole of the clamping block 530 is provided with a tapered surface 534 that cooperates with the tapered sleeve. The tapered surface 534 does not directly contact the eccentric section 511. At the same time, an anti-rotation guide structure is added to ensure that when the eccentric shaft rotates, the clamping block 530 is pushed to move stably along the axial direction through the wedge effect of the tapered surface, so as to avoid the clamping block rotating synchronously with the eccentric shaft.

[0032] When the locking handle 520 is turned, the eccentric shaft 510 rotates synchronously. The eccentric section 511 drives the clamping block 530 to swing radially and generate axial displacement at the same time. This pushes the end beam end connecting plate 200 towards the main beam end connecting plate 100, thereby pressing the two connecting plates tightly together. Relying on the force amplification characteristics of the eccentric mechanism, the operator can generate an axial clamping force that meets the requirements of large lifting structures by applying a small operating force.

[0033] The eccentric locking assembly 500 is equipped with an anti-loosening locking component to automatically prevent loosening after locking. The anti-loosening locking component includes a ratchet disc 540 and a pawl 550. The ratchet disc 540 is fixedly connected to the eccentric shaft 510 via a flat key and rotates synchronously with the eccentric shaft. Its outer circumference is provided with one-way helical teeth 541 to form a one-way locking structure. The pawl 550 is rotatably mounted on the end connecting plate 100 of the main beam via a pawl shaft 551. The head of the pawl 550 engages with the helical teeth 541 of the ratchet disc 540 to achieve the locking function.

[0034] A pawl spring 552 is provided between the pawl 550 and the main beam end connecting plate 100. The pawl spring is a torsion spring structure, which can continuously apply a clamping force to the pawl to ensure that the pawl is always tightly engaged with the ratchet disc 540, avoiding anti-loosening failure caused by engagement gap. The tail of the pawl 550 is provided with a manual unlocking pull ring 553. Pulling the pull ring 553 outward can disengage the pawl 550 from the ratchet disc 540, realizing the unlocking operation, which is convenient for subsequent disassembly or adjustment.

[0035] When the eccentric shaft 510 rotates in the locking direction (that is, the direction in which the clamping block 530 moves toward the end beam), the helical teeth 541 of the ratchet disc 540 push the pawl 550 to swing outward, allowing the eccentric shaft to rotate normally without affecting the locking operation. When the eccentric shaft 510 is subjected to a reverse torque (such as a loosening tendency caused by the vibration of a crane), the pawl 550 engages with the vertical surface of the helical tooth 541 to form a rigid lock, preventing the eccentric shaft from rotating in the opposite direction. This allows the eccentric locking assembly 500 to automatically lock after being locked in place, without the need for additional anti-loosening operations.

[0036] A gap compensation component 600 is provided between the main beam end connecting plate 100 and the end beam end connecting plate 200 to compensate for wear gaps on the connecting surfaces during long-term use, maintain stable clamping force, and prevent vibration and loosening caused by gaps. The gap compensation component 600 includes an elastic compensation shim 610 and a disc spring assembly 620. The elastic compensation shim 610 is clamped between the main beam end connecting plate 100 and the end beam end connecting plate 200, and adopts a composite shim structure with good elastic recovery capability. Its initial thickness is slightly larger than the design gap between the two connecting plates. Therefore, when the eccentric locking component 500 applies clamping force, the elastic compensation shim 610 is compressed and stores elastic potential energy. When the connecting surfaces develop small gaps due to long-term vibration or wear, the elastic compensation shim 610 automatically releases the compression amount to fill the gap and maintain stable pressure on the contact surface.

[0037] The disc spring assembly 620 is disposed between the eccentric section 511 of the eccentric shaft 510 and the clamping block 530. Specifically, the clamping block 530 has an annular step 533 in its inner hole. The disc spring assembly 620 is sleeved on the eccentric section 511, with one end abutting against the annular step 533 and the other end abutting against the shoulder 512 of the eccentric section 511. The disc spring assembly 620 is composed of multiple disc springs combined in an adaptive manner, and its total compression is adapted to the maximum axial displacement of the eccentric locking assembly 500, thereby achieving effective elastic compensation.

[0038] The locking process of the eccentric locking assembly 500 is divided into three stages, specifically: The first stage is the approach stage. The operator manually rotates the locking handle 520, which drives the eccentric shaft 510 to rotate. As the rotation angle increases, the radial swing of the conical eccentric section 511 causes the clamping block 530 to move closer to the end beam as a whole. At the same time, the wedge effect of the conical surface generates axial thrust, pushing the clamping block 530 to move along the guide structure towards the end beam connecting plate 200 until the end face of the clamping block 530 contacts the end beam connecting plate 200 and begins to generate pressure. The second stage is the spring compression and locking stage. When the handle is turned, the clamping block 530 has pressed against the end beam connecting plate 200 and cannot move further. However, the eccentric shaft 510 is allowed to continue to slide relative to the axial direction through the sliding bushing. At this time, the conical eccentric section 511 continues to move away from the conical sleeve 513 along the axial direction, so that the distance between the large end of the conical eccentric section 511 and the bottom of the conical hole of the clamping block is shortened. The disc spring group 620 sandwiched between the shoulder 512 and the annular step 533 of the inner hole of the clamping block is compressed and stores elastic potential energy. The third stage is the stable locking stage. When the handle is rotated to the predetermined position, the eccentric shaft 510 stops rotating. At this time, the disc spring assembly 620 provides continuous axial clamping force, which is transmitted to the end beam connecting plate through the shoulder 512, the eccentric shaft, the conical surface, and the clamping block, ultimately clamping the entire connection structure. Due to the self-locking characteristic of the conical surface, the eccentric shaft will not reverse on its own even without the ratchet mechanism. The ratchet mechanism, as a double safety measure, further prevents vibration-induced loosening and improves locking reliability.

[0039] The elastic compensation shim 610 and the disc spring assembly 620 work together to perform a gap compensation mechanism. Specifically, the elastic compensation shim 610 mainly compensates for the macroscopic gap between the two connecting plates, and the disc spring assembly 620 mainly compensates for the microscopic displacement of the eccentric locking assembly 500. The combination of the two makes the connection structure unnecessary to manually tighten during long-term use.

[0040] like Figure 6 As shown, on the contact surfaces of the main beam end connecting plate 100 and the end beam end connecting plate 200, there are cross-arranged anti-slip teeth 130 and 220. The anti-slip teeth are fine sawtooth patterns, and their tooth direction is perpendicular to the axis of the main beam.

[0041] When the two connecting plates are pressed together, the anti-slip teeth on both sides interlock, forming additional shear friction restraint and effectively preventing relative slippage under horizontal loads. The presence of the anti-slip teeth allows the connection structure to reliably withstand the horizontal inertial forces generated during the crane's starting and braking processes, rationally distributing the load, reducing reliance on the 500mm shear resistance of the eccentric locking assembly, and improving the overall connection reliability.

[0042] Installation process: The first step is to align the convex wedge block 110 on the main beam end connecting plate 100 with the concave wedge groove 210 on the end beam end connecting plate 200, and slowly push it in axially. With the help of the guide arc 111 at the front end of the convex wedge block, even if there is a slight deviation in the initial alignment, it can be automatically corrected during the insertion process. After being pushed in place, the relative positions of the main beam and the end beam in the horizontal and vertical directions are precisely locked, without the need for additional measurement and adjustment, thus achieving rapid positioning.

[0043] The second step is to manually rotate the locking handle 520, which drives the eccentric shaft 510 to rotate in the locking direction. The eccentric section 511 drives the clamping block 530 to move towards the end beam until the inner end face of the clamping block contacts the outer side of the end beam connecting plate 200, and axial clamping force begins to be generated.

[0044] Third, insert the lever into the lever hole 522 and continue to rotate the locking handle 520 to the preset locking state. During this process, the ratchet disc 540 rotates synchronously with the eccentric shaft 510, and the pawl 550, under the action of the pawl spring 552, continuously slides over the inclined surface of the helical teeth of the ratchet disc to complete the locking action; after stopping rotation, the pawl 550 automatically engages in the nearest tooth groove, locking the position of the eccentric shaft 510 and achieving automatic anti-loosening.

[0045] The fourth step is to check the relative position of the main beam and the end beam. If a slight adjustment is required due to manufacturing errors, the locking handle 520 can be rotated in the opposite direction by a small angle within the allowable backlash range of the ratchet. By changing the eccentric angle of the eccentric shaft 510, the axial position of the clamping block 530 can be finely adjusted to achieve precise compensation of the connection gap and ensure that the connection accuracy meets the usage requirements.

[0046] Work process: During normal operation, the main beam bears both vertical and horizontal inertial loads. The vertical load is efficiently transmitted through the inclined surface of the wedge-shaped positioning assembly, while the horizontal load is transmitted through the anti-slip teeth on the contact surface, achieving a reasonable load distribution and preventing overload from a single force transmission path. The eccentric locking assembly 500 continuously provides axial clamping force, ensuring that the two connecting plates are always tightly fitted, thus guaranteeing connection stability.

[0047] When the crane vibrates during operation, the eccentric shaft 510 may loosen and rotate in the opposite direction. However, the pawl 550 is always engaged with the vertical surface of the helical teeth of the ratchet disc 540, forming a rigid lock that prevents the eccentric shaft from rotating in the opposite direction, effectively maintaining the locked state and preventing loosening and failure. At the same time, the self-locking characteristic of the conical surface further enhances the anti-loosening effect, forming a double insurance.

[0048] After long-term service, the connecting surfaces may experience slight wear due to vibration and friction, leading to a decrease in axial clamping force. At this time, the elastic compensation shim 610 automatically releases part of its compression to fill the macroscopic gap caused by wear; simultaneously, the disc spring assembly 620 releases its elastic potential energy, pushing the clamping block 530 towards the end beam to compensate for the micro-displacement and restore stable axial clamping force. The entire compensation process is completed automatically and gradually without manual intervention, ensuring the long-term stable service of the connection structure.

[0049] Example 2 Based on the above embodiment one, this embodiment adds a connection status indicator to intuitively display the locking status of the eccentric locking assembly 500, which facilitates daily inspection and maintenance and improves ease of use.

[0050] Specifically, an indicator disc 560 is fixedly installed at the end of the eccentric shaft 510. The indicator disc 560 is clearly marked with "locked" and "loose" indicators. A corresponding observation window 140 is opened on the main beam end connecting plate 100, and the position of the observation window corresponds to the indicator disc markings. When the locking handle 520 is in the locked position, the "locked" indicator on the indicator disc 560 faces the observation window 140, and the operator can directly observe and judge the locking status. When it is in the loose position, the "loose" indicator faces the observation window 140, which intuitively indicates that the connection structure is not locked, which facilitates daily inspection and reduces maintenance workload.

[0051] Example 3 This embodiment provides a bridge crane employing the above-described connection structure. The crane mainly includes a main beam, end beams, a trolley, a trolley traveling mechanism, and a main-end beam connection structure as described in Embodiment 1. The main beam and end beams are detachably and fixedly connected via this connection structure, enabling rapid assembly and stable connection.

[0052] Due to its remarkable features of rapid installation and automatic anti-loosening, this connection structure significantly reduces the on-site installation time of the entire machine compared to traditional bolt connections. Furthermore, it eliminates the need for periodic bolt tightening during the service life, effectively reducing maintenance procedures and costs. At the same time, it enhances the overall operational stability and reliability of the crane, making it suitable for the use of various types of bridge cranes.

[0053] 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 main end beam connection structure for a bridge crane, characterized in that, The system includes a main beam end connecting plate (100) and an end beam end connecting plate (200), characterized in that it further includes: A convex wedge block (110) and a concave wedge groove (210) are provided. The convex wedge block (110) is fixed on the end connecting plate (100) of the main beam, and the concave wedge groove (210) is fixed on the end connecting plate (200) of the end beam. The convex wedge block (110) and the concave wedge groove (210) are complementary in shape and wedge each other. An eccentric locking assembly (500) is disposed on the side of the main beam end connecting plate (100) away from the end beam end connecting plate (200). The eccentric locking assembly (500) includes an eccentric shaft (510) rotatably connected to the main beam end connecting plate (100), a locking handle (520) fixedly connected to the eccentric shaft (510), and a pressing block (530) sleeved on the eccentric section (511) of the eccentric shaft (510). The pressing block (530) abuts against the outer side of the end beam end connecting plate (200). The anti-loosening locking assembly is connected to the eccentric shaft (510). The anti-loosening locking assembly includes a ratchet disc (540) fixedly connected to the eccentric shaft (510) and a pawl (550) rotatably connected to the end connecting plate (100) of the main beam. The pawl (550) meshes with the one-way helical teeth (541) on the outer circumference of the ratchet disc (540). The gap compensation assembly (600) includes an elastic compensation shim (610) sandwiched between the main beam end connecting plate (100) and the end beam end connecting plate (200), and a disc spring assembly (620) sleeved on the eccentric section (511). One end of the disc spring assembly (620) abuts against the shoulder (512) of the eccentric section (511), and the other end abuts against the annular step (533) inside the clamping block (530).

2. The main end beam connection structure of a bridge crane according to claim 1, characterized in that, The convex wedge block (110) is a trapezoidal cross-section protrusion, the width and height of which gradually increase along the insertion direction, and the front end of the convex wedge block (110) is provided with a guide arc (111); the concave wedge groove (210) is a trapezoidal groove that is complementary to the shape of the convex wedge block (110), and the inner wall of the concave wedge groove (210) is fitted with a self-lubricating wear-resistant liner (211).

3. The main end beam connection structure of a bridge crane according to claim 2, characterized in that, The convex wedge block (110) and the concave wedge groove (210) are arranged in two symmetrical sets, and the two sets of convex wedge blocks (110) and the two sets of concave wedge grooves (210) are respectively wedge-fitted.

4. The main end beam connection structure of a bridge crane according to claim 1, characterized in that, A conical sleeve (513) is fixed in the middle of the eccentric section (511), and the inner hole of the clamping block (530) is provided with a conical surface (534) that cooperates with the conical sleeve (513). A gap is left between the conical surface (534) and the outer surface of the eccentric section (511).

5. The main end beam connection structure of a bridge crane according to claim 4, characterized in that, The eccentric locking assembly (500) is further provided with an anti-rotation guide structure, which restricts the clamping block (530) from rotating synchronously with the eccentric shaft (510).

6. The main end beam connection structure of a bridge crane according to claim 1, characterized in that, Two bearing seats (120) are fixedly arranged on the outer side of the main beam end connecting plate (100), and the two ends of the eccentric shaft (510) are respectively rotatably installed in the two bearing seats (120).

7. The main end beam connection structure of a bridge crane according to claim 1, characterized in that, The locking handle (520) is provided with anti-slip texture (521) and force-applying hole (522); and the clamping block (530) is provided with wear-resistant pad (532) on the end face facing the end beam end connecting plate (200).

8. The main end beam connection structure of a bridge crane according to claim 1, characterized in that, The pawl (550) is rotatably mounted on the end connecting plate (100) of the main beam via the pawl shaft (551). A pawl spring (552) is provided between the pawl (550) and the end connecting plate (100) of the main beam. A manual unlocking pull ring (553) is provided at the tail of the pawl (550).

9. The main end beam connection structure of a bridge crane according to claim 1, characterized in that, It also includes a connection status indicator, which includes an indicator disk (560) fixed to the end of the eccentric shaft (510) and an observation window (140) opened on the end connecting plate (100) of the main beam. The indicator disk (560) is provided with "locked" and "unlocked" markings, and the position of the observation window (140) corresponds to the markings.

10. A bridge crane, comprising a main beam (300) and end beams (400), characterized in that, It also includes a bridge crane main end beam connection structure as described in any one of claims 1-9, wherein the main beam (300) and the end beam (400) are detachably and fixedly connected through the bridge crane main end beam connection structure.

Images