A front girder pitching mechanism and shore crane

Abstract

The application provides a front girder pitching mechanism and a shore crane, and relates to the technical field of shore cranes. The front girder pitching mechanism comprises a front girder, a pulling member and a rear section. The front girder comprises a front section and a rear section. The rear section is hinged to a ladder frame, and the front section is hinged to the rear section. The pulling member is connected between the ladder frame and the front section. During the pitching of the rear section relative to the front girder, when the bending angle of the front section relative to the rear section reaches a preset value, the pulling member is connected to the rear section to keep the bending angle of the front section relative to the rear section at the preset value. In this way, the pulling system in the prior art is improved. The pulling system can be connected to the rear section of the front girder while retaining the pulling function, so that the included angle between the front section and the rear section is kept fixed, the pitching and folding of the goose neck type front girder are realized, a connecting rod mechanism does not need to be additionally arranged on the front girder, the structure is simple, the shore crane can be adapted to higher and longer shore cranes, and the weight of the front girder and the lifting performance of the shore crane are not greatly increased.

Description

Technical Field

[0001] This application relates to the field of crane technology, specifically to a front beam pitching mechanism and a quay crane. Background Technology

[0002] A quay crane, also known as a "quay crane," is a container crane whose front beam needs to be raised before a ship docks to protect it from typhoons and provide berthing space. Figure 10 As shown, due to aviation height restrictions at the dock, the two most common solutions for dock cranes to meet these requirements are to raise the front beam by only 20 degrees and to design the front beam as a gooseneck foldable structure.

[0003] Among these options, the design of raising the front beam by only 20 degrees can prevent the beam from exceeding the required height after being raised, but it is not conducive to typhoon protection and providing berthing space for ships. While designing the front beam as a gooseneck-style foldable structure can effectively solve the height restriction problem, as well as the typhoon protection and berthing space issues, the gooseneck-style front beam structure requires an additional linkage mechanism, such as... Figure 11 As shown, this makes the front girder structure complex and very heavy, which also severely restricts the design length of the front girder, making it unsuitable for use on quay bridges with longer front girder structures. Summary of the Invention

[0004] In view of this, this application provides a front beam pitching mechanism and quay crane that can achieve gooseneck folding of the front beam without the need for additional linkage mechanisms.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A front beam pitch mechanism, comprising:

[0007] The front beam includes a front section and a rear section, the rear section being hinged to a trapezoidal frame, and the front section being hinged to the rear section, so that the front section can be bent relative to the rear section;

[0008] A tensioning member connects the trapezoidal frame and the front section, and can be connected to the rear section;

[0009] During the process of the rear section tilting up relative to the front beam, when the bending angle of the front section relative to the rear section reaches a preset value, the tensioning member connects to the rear section to maintain the bending angle of the front section relative to the rear section at the preset value.

[0010] Optionally, a first limiting seat is provided above one end of the rear section near the front section, and the pulling member includes a first pull rod. When the bending angle of the front section relative to the rear section reaches the preset value, the two ends of the first pull rod are respectively connected to the first limiting seat and the front section, and are triangularly distributed with the hinge axis between the front section and the rear section.

[0011] Optionally, a second limiting seat is provided above one end of the front section near the rear section, and the pulling member further includes a second pull rod. One end of the second pull rod is hinged to the first pull rod, and the other end is hinged to the front section. When the bending angle of the front section relative to the rear section reaches the preset value, the two ends of the first pull rod are respectively connected to the first limiting seat and the second limiting seat, and are triangularly distributed with the hinge axis between the front section and the rear section.

[0012] Optionally, when the bending angle of the front portion relative to the rear portion reaches the preset value, the distance between the first limiting seat and the second limiting seat is equal to the length of the first pull rod.

[0013] Optionally, a first limiting shaft is provided at the end of the first pull rod away from the front section, and the first limiting seat is provided with a first limiting groove for the first limiting shaft to be inserted into, the opening of the first limiting groove facing away from the front section.

[0014] Optionally, the first limiting seat is provided with a guide portion to guide the first limiting shaft into the first limiting groove.

[0015] Optionally, the first limiting groove gradually expands along the direction from the bottom of the groove to the opening of the groove.

[0016] Optionally, the first limiting shaft is set as the hinge shaft at the end of the first pull rod.

[0017] Optionally, a second limiting shaft is provided at the end of the second pull rod away from the front section, and a second limiting seat is provided with a second limiting groove for the second limiting shaft to be inserted into, with the opening of the second limiting groove facing the pulling member.

[0018] Optionally, the first tie rod can be configured as a plate or a tube.

[0019] A quay crane includes a front girder pitching mechanism, wherein the front girder pitching mechanism is the aforementioned front girder pitching mechanism.

[0020] The front girder pitching mechanism and quay crane provided in this application, during the process of the front girder pitching up relative to the trapezoidal frame, the steel wire rope of the pitching winding mechanism pulls the rear section to rotate upward relative to the trapezoidal frame. Simultaneously, due to the force of the traction member, the front section rotates downward relative to the rear section under its own weight. As the pitching angle of the rear section relative to the trapezoidal frame increases (the angle between the rear section and the trapezoidal frame decreases), the bending angle of the front section relative to the rear section increases (the angle between the front section and the rear section decreases). Furthermore, the traction component pulling the front section gradually approaches the raised rear section. When the bending angle of the front section relative to the rear section reaches a preset value, the traction component connects to the rear section, thus connecting the traction component between the front and rear sections. Through the two connection points of the traction component relative to the front and rear sections, and the hinge point of the front and rear sections, a three-point fixation is formed, fixing the angle between the front and rear sections and maintaining the bending angle of the front section relative to the rear section at the preset value. This configuration, by improving the existing traction system, allows it to retain the traction function while also connecting to the rear section of the front beam to maintain a fixed angle between the front and rear sections. This enables the gooseneck-type front beam to tilt and fold without adding a linkage mechanism to the front beam, resulting in a simple structure that can adapt to taller and longer quay cranes without significantly increasing the weight of the front beam or limiting the lifting performance of the quay crane. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram showing the front beam tilted up in some embodiments;

[0023] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0024] Figure 3 A schematic diagram of the connection of the first pull rod is shown in some embodiments;

[0025] Figure 4 This is a diagram illustrating the entire process of raising the front beam in some embodiments;

[0026] Figure 5 This is a diagram illustrating the horizontal placement of the front beam in some embodiments;

[0027] Figure 6This is a diagram showing the front beam tilted up 3 degrees, as illustrated in some embodiments.

[0028] Figure 7 This is a diagram showing the front beam tilted up at 5 degrees, as illustrated in some embodiments.

[0029] Figure 8 This is a diagram showing the front beam tilted up at 9 degrees, as illustrated in some embodiments.

[0030] Figure 9 This is a diagram illustrating the front beam tilted up at 20 degrees, as shown in some embodiments.

[0031] Figure 10 This is a diagram illustrating the traditional front beam lifting process in existing technologies.

[0032] Figure 11 This diagram illustrates the process of raising the front beam, which is designed as a gooseneck foldable structure in existing technology.

[0033] Figures 1-9 In the middle: 1. Front section; 2. Rear section; 3. Pulling component; 4. Trapezoidal frame; 5. Pitching and winding mechanism; 6. First limiting seat; 7. Second limiting seat; 31. First pull rod; 32. Second pull rod; 33. First limiting shaft; 34. Second limiting shaft. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] like Figures 1-9 As shown, this application embodiment provides a front beam pitching mechanism, including a front beam and a traction member 3. One end of the front beam is hinged to a trapezoidal frame 4 so that the front beam can be pitched (rotated upward) relative to the trapezoidal frame 4. Specifically, a pitching winding mechanism 5 is provided between the front beam and the trapezoidal frame 4, and the front beam is pitched by the steel wire rope of the pitching winding mechanism 5.

[0036] The front beam includes a front section 1 and a rear section 2. The rear section 2 is hinged to a trapezoidal frame 4 so that the rear section 2 can be tilted up relative to the trapezoidal frame 4. Specifically, a pitch winding mechanism 5 is set between the rear section 2 and the trapezoidal frame 4. The steel wire rope of the pitch winding mechanism 5 pulls the front beam up. The front section 1 is hinged to the rear section 2 so that the front section 1 can be bent relative to the rear section 2. When the rear section 2 is tilted up relative to the trapezoidal frame 4, the front section 1 is affected by its own weight and rotates downward relative to the rear section 2 (bends), so that the entire front beam is bent (folded).

[0037] The tension member 3 connects the trapezoidal frame 4 and the front section 1, and is used to tension the front section 1, forming a tension system to maintain the relative position of the front section 1 and the trapezoidal frame 4. That is, when the front beam is placed horizontally, the tension member 3 is tightened and restricts the front beam from rotating downward relative to the trapezoidal frame 4. Specifically, the tension member 3 is set in the form of multiple tie rods hinged together, i.e., the front tie rod in the prior art. Of course, it can also be set in the form of a rope structure or a chain structure.

[0038] Specifically, the ends of the front section 1 and the rear section 2 abut each other, and the hinge position of the front section 1 and the rear section 2 is located at the lower part of the ends of the front section 1 and the rear section 2. In this way, the front section 1 can only rotate downward relative to the rear section 2, but cannot rotate upward relative to the rear section 2, so as to ensure the stability of the front beam when it is placed horizontally.

[0039] During the process of the front beam tilting upwards relative to the trapezoidal frame 4, the steel wire rope of the pitching and winding mechanism 5 pulls the rear section 2 to rotate upwards relative to the trapezoidal frame 4. At the same time, due to the force of the traction member 3, the front section 1 rotates downwards relative to the rear section 2 under its own weight. As the tilting angle of the rear section 2 relative to the trapezoidal frame 4 increases (the angle formed between the rear section 2 and the trapezoidal frame 4 decreases), the bending angle of the front section 1 relative to the rear section 2 increases (the angle formed between the front section 1 and the rear section 2 decreases), and the front section is pulled downwards. The pulling member 3 of section 1 gradually approaches the raised rear section 2. When the bending angle of section 1 relative to section 2 reaches a preset value, the pulling member 3 connects to section 2, so that the pulling member 3 is connected between section 1 and section 2. Through the two connection points of the pulling member 3 relative to section 1 and section 2, and the hinge point of section 1 and section 2, three-point fixation is formed, and the angle of section 1 and section 2 is fixed, thereby keeping the bending angle of section 1 relative to section 2 at the preset value.

[0040] The preset values ​​can be set according to actual needs. For example, if the rear section 2 is tilted up at 80 degrees, the front section 1 needs to be kept horizontal, so the preset value can be set to 80 degrees.

[0041] This design, by improving the existing traction system, allows it to retain its traction function while also connecting to the rear section 2 of the front beam. This maintains a fixed angle between the front section 1 and the rear section 2, thereby enabling the gooseneck-type front beam to pitch and fold without the need for additional linkage mechanisms on the front beam. The structure is simple, can adapt to taller and longer quay cranes, and does not significantly increase the weight of the front beam or limit the lifting performance of the quay crane.

[0042] In some preferred embodiments, the rear section 2 is provided with a first limiting seat 6, which is located above the end of the rear section 2 near the front section 1, such that the first limiting seat 6 protrudes from the upper surface of the rear section 2 to facilitate receiving the pulling member 3. Furthermore, the pulling member 3 has a first pull rod 31, which is a section of the pulling member 3 near the front section 1. One end of the first pull rod 31 is connected to the front section 1, and the other end can be connected to the first limiting seat 6. During the process of the rear section 2 tilting upwards relative to the trapezoidal frame 4, when the bending angle of the front section 1 relative to the rear section 2 reaches a preset value, the first pull rod 31 connects to the first limiting seat 6, so that both ends of the first pull rod 31 are respectively connected and fixed to the first limiting seat 6 and the front section 1. At the same time, the two ends of the first pull rod and the hinge axis between the front and rear sections are triangularly distributed, so that the connection between the front and rear sections is fixed by three points through the above three, thereby maintaining the bending angle of the front section relative to the rear section at the preset value. In this way, the triangular support and fixation between the front and rear sections is achieved through the two ends of the first pull rod and the hinge axis between the front and rear sections. The structure is simple and facilitates a stable connection.

[0043] Here, since the first tie rod 31 needs to bear the weight of the front part 1, the first tie rod 31 is set as a plate or a tube, which can make the first tie rod 31 have strong stability and not bend or deform easily, thereby ensuring the reliability of the structure.

[0044] Furthermore, a second limiting seat 7 is provided in the front section 1. The second limiting seat 7 is located above the end of the front section 1 near the rear section 2, so that the second limiting seat 7 protrudes from the upper surface of the front section 1. Moreover, the pulling member 3 has a second pull rod 32, which is a section near the front section 1. Specifically, the two ends of the second pull rod 32 are respectively hinged to the front section 1 and the first pull rod 31 to form a connection between the first pull rod 31 and the front section 1.

[0045] like Figure 6-9As shown, during the process of the rear section 2 tilting upward relative to the trapezoidal frame 4, the front section 1 rotates downward relative to the rear section 2. At the same time, the second pull rod 32 of the pulling member 3 gradually comes into contact with the front section 1 until the second pull rod 32 contacts the second limiting seat 7. Then, the first pull rod 31 of the pulling member 3 rotates downward relative to the second pull rod 32 and gradually approaches the rear section 2 until the first pull rod 31 contacts the first limiting seat 6. When the bending angle of the front section 1 relative to the rear section 2 reaches a preset value, one end of the first pull rod 31 is connected to the first limiting seat 6 (e.g., snap-fit ​​connection or barb connection), and the other end is connected to the second limiting seat (e.g., slot connection or support connection), so that the first pull rod 31 is limited between the first limiting seat 6 and the second limiting seat 7. The connection between the first pull rod and the first limiting seat can be configured as a snap-fit ​​connection or a hook connection, while the connection between the first pull rod and the second support seat is a support connection. The first pull rod is connected to the front section through the second pull rod and is limited to the second limiting seat, thus forming a connection relationship between the first pull rod and the second limiting seat. Simultaneously, when the bending angle of the front section 1 relative to the rear section 2 reaches a preset value, the two ends of the first pull rod (or the first and second limiting seats) and the hinge axis between the front and rear sections are triangularly distributed, so that the connection between the front and rear sections is fixed at three points through these three components, thereby maintaining the bending angle of the front section relative to the rear section at the preset value.

[0046] In this way, the pulling member 3 is supported by the second limiting seat 7 protruding from the front section 1, and the pulling member 3 is connected by the first limiting seat 6 protruding from the rear section 2. The bending angle of the front section 1 relative to the rear section 2 can be accurately and reliably maintained at a preset value. At the same time, the first pull rod 31 is connected to the front section 1 through the second pull rod 32, which can make the connection position between the pulling member 3 and the front section 1 far away from the rear section 2, thereby improving the pulling stability of the pulling member 3 on the front section 1.

[0047] In order to ensure that the two ends of the first pull rod can be precisely positioned and connected to the first and second limit seats, when the bending angle of the front section relative to the rear section reaches a preset value, the distance between the first and second limit seats is equal to the length of the first pull rod. When the second pull rod contacts or connects with the second limit seat, the first pull rod rotates downward relative to the second pull rod, and the end of the first pull rod can be precisely connected with the first limit seat.

[0048] like Figure 2-3As shown, the first pull rod 31 is provided with a first limiting shaft 33, and a first limiting seat 6 is located at the end of the first pull rod 31 away from the front section 1. Furthermore, a first limiting groove is provided on the first limiting seat 6, with the opening of the first limiting groove facing away from the front section 1 to form a barb. The first limiting shaft 33 matches the first limiting groove so that the first limiting shaft 33 can be embedded into the first limiting groove. When the first limiting shaft 33 is embedded into the first limiting groove, since the opening of the first limiting groove faces away from the front section 1, the first limiting groove can apply a force away from the front section 1 to the first limiting shaft 33. That is, the force applied by the first limiting seat 6 to the first pull rod 31 is away from the front section 1. Simultaneously, the other end of the first pull rod 31 is connected to the front section 1 so that the force applied by the front section 1 to the first pull rod 31 is away from the rear section 2. Thus, the rotation of the front section 1 relative to the rear section 2 is limited by the first pull rod 31. In this way, the connection between the first pull rod 31 and the rear section 2 is achieved by using a barb, which is simple in structure, stable and reliable, and improves the convenience of connection.

[0049] Of course, in other solutions, the first limiting shaft 33 can be set on the first limiting seat 6, and the first limiting groove can be set on the first pull rod 31. This will not be explained in detail here.

[0050] Specifically, two first limiting grooves can be provided, arranged side by side, and two first limiting shafts 33 can be provided, respectively located on both sides of the first pull rod 31. The two first limiting shafts 33 are simultaneously embedded in the two first limiting grooves to achieve the connection between the first pull rod 31 and the first limiting seat 6. Alternatively, one first limiting groove can be provided, with both ends of the first limiting shaft 33 connected to the first pull rod 31, and the first limiting groove connected to the middle of the first limiting shaft 33.

[0051] In some preferred embodiments, the first limiting seat 6 is provided with a guide portion, which is used to guide the first limiting shaft 33 into the first limiting groove. During the process of the rear section 2 tilting up relative to the trapezoidal frame 4, the first pull rod 31 of the pulling member 3 rotates downward relative to the second pull rod 32 and gradually approaches the rear section 2 until the first pull rod 31 contacts the first limiting seat 6. At this time, the first pull rod 31 (or the first limiting shaft 33) contacts the guide portion. The rear section 2 continues to tilt up, so that the first pull rod 31 (or the first limiting shaft 33) slides along the guide portion until the first limiting shaft 33 is displaced into the first limiting groove. In this way, through the guiding effect of the guide portion, the first limiting shaft 33 can be accurately embedded into the first limiting groove, realizing the connection between the first pull rod 31 and the rear section 2.

[0052] Specifically, one side wall of the limiting groove near the rear section 2 extends away from the front section 1, thus forming a guide section. When the first pull rod 31 contacts the rear section 2, the first limiting shaft 33 contacts the guide section, thereby achieving guidance. Alternatively, when two first limiting grooves are arranged side by side, the guide section is located between the two first limiting grooves. When the first pull rod 31 contacts the rear section 2, the first pull rod 31 is located between the two first limiting grooves and contacts the guide section, so that the first pull rod 31 is guided along the guide section.

[0053] The first limiting groove gradually widens from the bottom to the opening, so that when the main beam rotates downward relative to the trapezoidal frame 4, the first limiting shaft 33 can easily disengage from the first limiting groove, thereby releasing the connection between the first pull rod 31 and the first limiting seat 6, so that the pulling member 3 can pull the front part 1 to rotate upward relative to the rear part 2.

[0054] Here, the first limiting shaft 33 is set as the hinge shaft at the end of the first pull rod 31. In this way, the original structural components of the first pull rod 31 are utilized, without the need to add new structures, saving costs and improving reliability. Specifically, the end of the first pull rod 31 is provided with a hinge shaft, which is hinged to the pull rod adjacent to the first pull rod 31. The two ends of the hinge shaft of the first pull rod 31 extend and protrude from both sides of the first pull rod 31 and the adjacent pull rod, thereby forming two first limiting shafts 33.

[0055] like Figure 2-3 As shown, the second pull rod 32 is provided with a second limiting shaft 34, which is located at the end away from the front section 1. Furthermore, a second limiting groove is provided on the second limiting seat 7, with the opening of the groove facing the pulling member 3, so that the second limiting shaft 34 can extend into the second limiting groove. The second limiting groove matches the second limiting shaft 34, allowing the second limiting shaft 34 to be embedded within it. Since the opening of the second limiting groove faces the pulling member 3, i.e., away from the front section 1, when the second pull rod 32 rotates downward relative to the front section 1 and gradually conforms to the front section 1, the second limiting groove allows the second limiting shaft 34 to be embedded and supported, thus fixing the second pull rod 32 relative to the front section 1. This, in turn, causes the first pull rod 31 to rotate downward relative to the second pull rod 32 and connect with the first limiting seat 6 of the rear section 2, resulting in better connection reliability.

[0056] Specifically, the second limiting seat 7 is set as the hinge shaft between the first pull rod 31 and the second pull rod 32. It utilizes the existing structural components without adding new structures, thus improving reliability.

[0057] This application provides a quay crane including the aforementioned front beam pitching mechanism. This configuration improves upon the existing traction system, allowing it to retain its traction function while also connecting to the rear section 2 of the front beam. This maintains a fixed angle between the front section 1 and the rear section 2, thereby enabling the pitching and folding of the gooseneck-type front beam. No additional linkage mechanism is needed on the front beam, resulting in a simple structure that can accommodate taller and longer quay cranes without significantly increasing the weight of the front beam or limiting the lifting performance of the quay crane.

[0058] In addition, for other beneficial effects brought about by this quay bridge, please refer to the above description of the front girder pitching mechanism, which will not be repeated here.

[0059] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0060] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0061] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0062] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0063] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0064] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A front beam pitching mechanism, characterized in that, include: The front beam includes a front section and a rear section, the rear section being hinged to a trapezoidal frame, and the front section being hinged to the rear section, so that the front section can be bent relative to the rear section; A tensioning member connects the trapezoidal frame and the front section, and can be connected to the rear section; During the process of the rear section tilting up relative to the front beam, when the bending angle of the front section relative to the rear section reaches a preset value, the traction member connects to the rear section to maintain the bending angle of the front section relative to the rear section at the preset value. A first limiting seat is provided above one end of the rear section near the front section. The traction member includes a first pull rod. When the bending angle of the front section relative to the rear section reaches the preset value, the two ends of the first pull rod are respectively connected to the first limiting seat and the front section, and are triangularly distributed with the hinge axis between the front section and the rear section.

2. The front beam pitching mechanism according to claim 1, characterized in that, A second limiting seat is provided above one end of the front section near the rear section. The pulling member also includes a second pull rod. One end of the second pull rod is hinged to the first pull rod, and the other end is hinged to the front section. When the bending angle of the front section relative to the rear section reaches the preset value, both ends of the first pull rod are connected to the first limiting seat and the second limiting seat respectively, and are triangularly distributed with the hinge axis between the front section and the rear section.

3. The front beam pitching mechanism according to claim 2, characterized in that, When the bending angle of the front section relative to the rear section reaches the preset value, the distance between the first limiting seat and the second limiting seat is equal to the length of the first pull rod.

4. The front beam pitching mechanism according to claim 2, characterized in that, The first pull rod is provided with a first limiting shaft at the end away from the front section, and the first limiting seat is provided with a first limiting groove for the first limiting shaft to be inserted into, and the opening of the first limiting groove faces away from the front section.

5. The front beam pitching mechanism according to claim 4, characterized in that, The first limiting seat is provided with a guide portion to guide the first limiting shaft into the first limiting groove.

6. The front beam pitching mechanism according to claim 4, characterized in that, The first limiting groove gradually expands from the bottom of the groove to the opening of the groove.

7. The front beam pitching mechanism according to claim 4, characterized in that, The first limiting shaft is set as the hinge shaft at the end of the first pull rod.

8. The front beam pitching mechanism according to claim 2, characterized in that, The second pull rod is provided with a second limiting shaft at one end away from the front section, and the second limiting seat is provided with a second limiting groove for the second limiting shaft to be inserted into, with the opening of the second limiting groove facing the pulling member.

9. A quay crane, comprising a front girder pitching mechanism, characterized in that, The front beam pitch mechanism is the front beam pitch mechanism as described in any one of claims 1-8.

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