Arm tip pulley mounting structure and crane

Abstract

The utility model discloses an arm tip pulley mounting structure and a crane, and relates to the technical field of cranes, the arm tip pulley mounting structure comprises a fixed frame, a movable frame and a pulley body, the fixed frame is provided with a reference surface, the movable frame is movably arranged on the fixed frame, and the movable frame is provided with a first working position and a second working position; the pulley body is arranged on the movable frame; when the movable frame is located at the first working position, part of the movable frame and the pulley body are both located below the datum plane, and the pulley body is located on the side, away from the cargo boom, of the fixed frame. When the movable frame is located at the second working position, the movable frame and the pulley body are located above the datum plane. According to the technical scheme provided by the utility model, the technical problem of low construction efficiency caused by unreasonable mounting structure of the arm tip pulley can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to an installation structure of a tip pulley of a crane and a crane. Background Art

[0002] A crane is a heavy mechanical device used for lifting and moving heavy objects, and is widely used in various industries such as construction, manufacturing, logistics, ports, and warehouses. However, the installation structure of the tip pulley of the existing crane is unreasonable. When the crane switches between the working state and the moving state, construction workers need to repeatedly disassemble and assemble the tip pulley, which will affect the construction efficiency.

[0003] Therefore, it is necessary to provide a new installation structure of a tip pulley of a crane and a crane to solve the above technical problems. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide an installation structure of a tip pulley of a crane and a crane, aiming to solve the technical problem of low construction efficiency caused by the unreasonable installation structure of the tip pulley.

[0005] To achieve the above purpose, an installation structure of a tip pulley of a crane proposed by the utility model includes:

[0006] A fixed frame, the fixed frame has a reference surface;

[0007] A movable frame, the movable frame is movably arranged on the fixed frame, and the movable frame has a first working position and a second working position;

[0008] A pulley body, the pulley body is arranged on the movable frame;

[0009] When the movable frame is in the first working position, a part of the movable frame and the pulley body are both located below the reference surface, and the pulley body is located on the side of the fixed frame away from the boom; when the movable frame is in the second working position, the movable frame and the pulley body are located above the reference surface.

[0010] In an embodiment, the fixed frame is provided with a first connection hole and two second connection holes, the movable frame is provided with a first connecting member and a second connecting member, and the first connecting member passes through the first connection hole;

[0011] When the movable frame is in the first working position, the second connecting member passes through one of the second connection holes; when the movable frame is in the second working position, the second connecting member passes through the other second connection hole.

[0012] In one embodiment, the movable frame is provided with a third connecting hole, and the third connecting hole can be connected to any one of the second connecting holes, and the second connecting member is sequentially inserted into the second connecting hole and the third connecting hole that are connected to each other.

[0013] In one embodiment, the fixed frame is provided with a first slide slot and a second slide slot, the movable frame is provided with a first connecting member and a second connecting member, the first connecting member is movably provided in the first slide slot, the second connecting member is movably provided in the second slide slot, the first slide slot has a first installation position and a second installation position, and the second slide slot has a third installation position and a fourth installation position;

[0014] When the movable frame is in the first working position, the first connecting member is in the first installation position, and the second connecting member is in the third installation position; when the movable frame is in the second working position, the first connecting member is in the second installation position, and the second connecting member is in the fourth installation position.

[0015] In one embodiment, a limiting portion is formed at one end of the first connecting member and the second connecting member, and a pin hole is formed at the other end, and a locking pin is passed through the pin hole.

[0016] In one embodiment, the arm tip pulley mounting structure further includes a toggle assembly, and the toggle assembly includes a mounting seat and a toggle rod, the mounting seat is disposed on the fixing frame, and the toggle rod is disposed on the mounting seat.

[0017] In one embodiment, the toggle assembly also includes a pin, the mounting seat is provided with a first lock hole, the toggle rod is slidably disposed on the mounting seat, and the toggle rod is provided with multiple second lock holes, any one of the second lock holes can be connected to the first lock hole, and the pin is sequentially inserted into the second lock hole and the first lock hole that are connected to each other.

[0018] In one embodiment, a rope blocking rod is provided on the movable frame, and the rope blocking rod is located outside the pulley body.

[0019] In one embodiment, the arm tip pulley mounting structure further includes a connecting rod, and the connecting rod is used to connect the fixing frame and the lifting arm.

[0020] In addition, the utility model also provides a crane, comprising:

[0021] Car body;

[0022] A lifting arm, the lifting arm is movably arranged on the vehicle body;

[0023] A driving cylinder, both ends of which are respectively hinged to the vehicle body and the lifting arm;

[0024] The arm tip pulley mounting structure as described above is disposed at one end of the boom away from the vehicle body.

[0025] The technical solution of the present utility model is to movably arrange the movable frame on the fixed frame and enable the movable frame to switch between the first working position and the second working position. When the crane switches between the working state and the moving state, the construction personnel can switch the position of the movable frame according to actual needs to meet the usage conditions of the crane. It does not require the construction personnel to repeatedly disassemble and assemble the arm tip pulley, which can improve the construction efficiency. In this embodiment, the reference plane refers to the bottom surface of the fixed frame. When the boom is in a horizontal state, as long as there is no obstacle below the reference plane, the driver's cab view will not be blocked. The pulley body is the arm tip pulley in the prior art. The movable frame has a first working position and a second working position, and the construction personnel can switch the position of the movable frame, that is, switch the position of the pulley body, by driving the movable frame to move. Specifically, when the crane is in the working state, the construction personnel can switch the movable frame to the first working position by driving the movable frame to move. At this time, the movable frame is located obliquely below the fixed frame. During operation, as the boom gradually rises, the horizontal distance between the pulley body and the arm head pulley will gradually increase, which can effectively prevent the main hook and the auxiliary hook from colliding. When the crane is in the moving state, the construction personnel can switch the movable frame to the second working position by driving the movable frame to move. At this time, both the movable frame and the pulley body are located above the reference plane, which can effectively avoid blocking the driver's cab view and thus ensure the driving safety of the crane during movement. This arm tip pulley mounting structure is applied to the technical field of mobile cranes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0027] Figure 1 FIG. 13 is a schematic structural diagram of the arm tip pulley mounting structure (the movable frame is in the first working position) in the first embodiment provided by the present utility model;

[0028] Figure 2 is Figure 1 an exploded view of;

[0029] Figure 3 FIG. 23 is a schematic structural diagram of the arm tip pulley mounting structure (the movable frame is in the second working position) in the first embodiment provided by the present utility model;

[0030] Figure 4 A schematic diagram of the structure of the arm tip pulley installation structure (the movable frame is in the first working position) in the second embodiment provided by the utility model;

[0031] Figure 5 This is a structural schematic diagram of the arm tip pulley installation structure (the movable frame is in the second working position) in the second embodiment provided by the utility model;

[0032] Figure 6 This is a schematic structural diagram of a crane in an embodiment provided by the utility model.

[0033] Description of Figure Numbers:

[0034] 100. Arm tip pulley mounting structure; 1. Fixed frame; 11. First connecting hole; 12. Second connecting hole; 13. First slide slot; 131. First mounting position; 132. Second mounting position; 14. Second slide slot; 141. Third mounting position; 142. Fourth mounting position; 2. Movable frame; 21. First connecting member; 211. Position limiting part; 212. Lock pin; 213. Lock rod; 22. Second connecting member; 23. Third connecting hole; 24. Rope blocking rod; 3. Pulley body; 4. Toggle assembly; 41. Mounting seat; 42. Toggle rod; 43. Pin; 5. Connecting rod;

[0035] 200, vehicle body; 300, lifting arm; 400, driving cylinder.

[0036] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously.

[0040] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0041] A crane is a heavy machinery and equipment used for lifting and moving heavy objects. When the crane operates under some special working conditions, the crane often needs to install a tip pulley so that the crane can use the main hook and the auxiliary hook simultaneously to ensure the safety of the heavy object lifting process. When moving, the tip pulley needs to be disassembled to avoid blocking the driver's cab view. During actual use, the researchers found that the existing tip pulleys are usually fixedly installed. When the crane switches to the operating state, the construction workers need to install the tip pulley on the boom, and when the crane switches to the moving state, the construction workers need to disassemble the tip pulley from the boom. That is to say, when the crane switches between the operating state and the moving state, the construction workers need to repeatedly install and disassemble the tip pulley, which will affect the construction efficiency.

[0042] The present utility model provides a tip pulley installation structure and a crane, aiming to solve the technical problem of low construction efficiency caused by the unreasonable installation structure of the tip pulley.

[0043] Please refer to Figure 1 、 Figure 3 、 Figure 4 and Figure 5 , in an embodiment of the present utility model, the tip pulley installation structure 100 includes a fixed frame 1, a movable frame 2, and a pulley body 3. The fixed frame 1 has a reference plane. The movable frame 2 is movably arranged on the fixed frame 1, and the movable frame 2 has a first working position and a second working position. The pulley body 3 is arranged on the movable frame 2. When the movable frame 2 is in the first working position, a part of the movable frame 2 and the pulley body 3 are both located below the reference plane, and the pulley body 3 is located on the side of the fixed frame 1 away from the boom 300. When the movable frame 2 is in the second working position, the movable frame 2 and the pulley body 3 are located above the reference plane.

[0044] The technical solution of the present utility model is to movably arrange the movable frame 2 on the fixed frame 1, and enable the movable frame 2 to switch between the first working position and the second working position. When the crane switches between the working state and the moving state, construction workers can switch the position of the movable frame 2 as needed to meet the use conditions of the crane. It does not require construction workers to repeatedly disassemble and assemble the tip pulley, which can improve construction efficiency. In this embodiment, the reference plane refers to the bottom surface of the fixed frame 1. When the boom 300 is in a horizontal state, as long as there is no obstacle below the reference plane, the driver's cab view will not be blocked. The pulley body 3 is the tip pulley in the prior art. The movable frame 2 has a first working position and a second working position, and construction workers can switch the position of the movable frame 2 by driving the movable frame 2 to move, that is, switch the position of the pulley body 3. Specifically, from the Figure 6 perspective for description, when the crane is in the working state, construction workers can switch the movable frame 2 to the first working position by driving the movable frame 2 to move. At this time, the movable frame 2 is located obliquely below the fixed frame 1. During operation, as the boom 300 gradually rises, the horizontal distance between the pulley body 3 and the head pulley will gradually increase, which can effectively prevent the main hook and the auxiliary hook from colliding. When the crane is in the moving state, construction workers can switch the movable frame 2 to the second working position by driving the movable frame 2 to move. At this time, both the movable frame 2 and the pulley body 3 are located above the reference plane, which can effectively avoid blocking the driver's cab view and thus ensure the driving safety of the crane during movement. This tip pulley installation structure 100 is applied to the technical field of mobile cranes.

[0045] Please refer to Figure 2 , in an embodiment of the present utility model, the fixed frame 1 is provided with a first connection hole 11 and two second connection holes 12, and the movable frame 2 is provided with a first connecting member 21 and a second connecting member 22. The first connecting member 21 is inserted into the first connection hole 11. When the movable frame 2 is in the first working position, the second connecting member 22 is inserted into one of the second connection holes 12. When the movable frame 2 is in the second working position, the second connecting member 22 is inserted into the other second connection hole 12. Specifically, inserting the first connecting member 21 into the first connection hole 11 can act as a hinge shaft to realize the hinge connection between the fixed frame 1 and the movable frame 2. When switching the position of the movable frame 2, that is, switching the position of the pulley body 3, construction workers can rotate the movable frame 2 with the first connecting member 21 as the hinge shaft, thereby driving the second connecting member 22 to move. When the movable frame 2 is switched to the first working position or the second working position, inserting the second connecting member 22 into the corresponding second connection hole 12 can fix the movable frame 2 in the first working position or the second working position. In a specific embodiment, both the first connecting member 21 and the second connecting member 22 can be pin shafts.

[0046] In an embodiment of the present utility model, the movable frame 2 is provided with a third connection hole 23, and the third connection hole 23 can communicate with any one of the second connection holes 12. The second connecting member 22 is sequentially passed through the mutually communicating second connection hole 12 and the third connection hole 23. Specifically, when the movable frame 2 is rotated to the first working position or the second working position, by sequentially passing the second connecting member 22 through the mutually communicating second connection hole 12 and the third connection hole 23, the movable frame 2 can be fixed to the first working position or the second working position. It should be noted that the distances between the second connection holes 12 and the first connection hole 11 may be equal or unequal. Correspondingly, the number of the third connection holes 23 provided on the movable frame 2 may be one or more. Specifically, when the distances between the second connection holes 12 and the first connection hole 11 are equal, since the movable frame 2 rotates with the first connecting member 21 as the hinge axis, when the third connection hole 23 can communicate with one of the second connection holes 12, the third connection hole 23 will surely be able to communicate with other second connection holes 12, that is, the number of the third connection holes 23 can be one; setting the distances between the second connection holes 12 and the first connection hole 11 to be equal can reduce the number of the third connection holes 23 required to be provided on the movable frame 2 and reduce the manufacturing difficulty. When the distances between the second connection holes 12 and the first connection hole 11 are unequal, since the movable frame 2 rotates with the first connecting member 21 as the hinge axis, when the third connection hole 23 can communicate with one of the second connection holes 12, the third connection hole 23 will surely not be able to communicate with other second connection holes 12. That is to say, in order to fix the position of the movable frame 2, a plurality of third connection holes 23 need to be provided on the movable frame 2 so that each third connection hole 23 can communicate with the corresponding second connection hole 12; in this embodiment, the number of the third connection holes 23 is two, and the distance between the upper second connection hole 12 and the first connection hole 11 is less than the distance between the lower second connection hole 12 and the first connection hole 11, which can reduce the height of the fixing frame 1 and thus reduce the volume.

[0047] Please refer to Figure 4 and Figure 5, in an embodiment of the present utility model, the fixing frame 1 is provided with a first sliding groove 13 and a second sliding groove 14, the movable frame 2 is provided with a first connecting member 21 and a second connecting member 22, the first connecting member 21 is movably arranged in the first sliding groove 13, the second connecting member 22 is movably arranged in the second sliding groove 14, the first sliding groove 13 has a first installation position 131 and a second installation position 132, and the second sliding groove 14 has a third installation position 141 and a fourth installation position 142; when the movable frame 2 is in the first working position, the first connecting member 21 is in the first installation position 131, and the second connecting member 22 is in the third installation position 141; when the movable frame 2 is in the second working position, the first connecting member 21 is in the second installation position 132, and the second connecting member 22 is in the fourth installation position 142. In this embodiment, the construction worker can drive the first connecting member 21 to move along the first sliding groove 13, and further drive the second connecting member 22 to move along the second sliding groove 14 to switch the position of the movable frame 2, that is, to switch the position of the pulley body 3. Specifically, when the movable frame 2 is in the first working position, the first connecting member 21 is in the first installation position 131, and the second connecting member 22 is in the third installation position 141; when the movable frame 2 is in the second working position, the first connecting member 21 is in the second installation position 132, and the second connecting member 22 is in the fourth installation position 142. It should be noted that the first installation position 131 and the second installation position 132 can be either two ends of the first sliding groove 13 or any two positions of the first sliding groove 13, and the same applies to the third installation position 141 and the fourth installation position 142. In this embodiment, the first installation position 131 and the second installation position 132 are respectively located at both ends of the first sliding groove 13, and the third installation position 141 and the fourth installation position 142 are respectively located at both ends of the second sliding groove 14.

[0048] In a specific embodiment, the first sliding groove 13 includes a first vertical connecting section, a first horizontal connecting section and an arc section connected in sequence, and the second sliding groove 14 includes a second vertical connecting section and a second horizontal connecting section connected to each other, wherein the first vertical connecting section corresponds to the second vertical connecting section, and the first horizontal connecting section corresponds to the second horizontal connecting section. Specifically, when the first connecting member 21 slides in the first vertical connecting section, the second connecting member 22 slides in the second vertical connecting section; when the first connecting member 21 slides in the first horizontal connecting section, the second connecting member 22 slides in the second horizontal connecting section; when the first connecting member 21 slides in the arc section, the second connecting member 22 rotates at one end of the second horizontal connecting section away from the second vertical connecting section. In this embodiment, the first installation position 131 is located at one end of the first vertical connecting section away from the first horizontal connecting section, the second installation position 132 is located at one end of the arc section away from the first horizontal connecting section, the third installation position 141 is located at one end of the second vertical connecting section away from the second horizontal connecting section, and the fourth installation position 142 is located at one end of the second horizontal connecting section away from the second vertical connecting section.

[0049] Please refer toFigure 2 In one embodiment of the utility model, a limiting portion 211 is formed at one end of the first connecting member 21 and the second connecting member 22, and a pin hole is formed at the other end, and a locking pin 212 is passed through the pin hole. Specifically, the limiting portion 211 and the locking pin 212 provided on the first connecting member 21 and the second connecting member 22 play a limiting role, which can prevent the first connecting member 21 and the second connecting member 22 from falling off. In a specific embodiment, the locking pin 212 is rotatably provided with a locking rod 213, and the locking rod 213 is U-shaped; and one end of the locking rod 213 is hinged to one end of the locking pin 212, and the other end is formed with a receiving hole, and the other end of the locking pin 212 can be passed through the receiving hole.

[0050] See also Figure 2 In one embodiment of the utility model, the arm tip pulley mounting structure 100 further includes a toggle assembly 4, the toggle assembly 4 includes a mounting seat 41 and a toggle rod 42, the mounting seat 41 is arranged on the fixed frame 1, and the toggle rod 42 is arranged on the mounting seat 41. In this embodiment, the toggle rod 42 is for the construction personnel to hold, and the toggle rod 42 is installed on the fixed frame 1 through the mounting seat 41. When the construction personnel need to switch the position of the movable frame 2, they can operate by holding the toggle rod 42, which can ensure the safety of the construction personnel. Specifically, if the toggle rod 42 and other structures for the construction personnel to hold are not provided, the construction personnel need to hold the pulley body 3 when switching the position of the movable frame 2, but because the pulley body 3 itself can rotate, when the construction personnel hold the pulley body 3 to switch the position of the movable frame 2, the pulley body 3 is very likely to rotate, thereby causing the construction personnel to be pinched.

[0051] In one embodiment of the utility model, the toggle assembly 4 further includes a pin 43, the mounting seat 41 is provided with a first lock hole, the toggle rod 42 is slidably disposed on the mounting seat 41, and the toggle rod 42 is provided with a plurality of second lock holes, any of which can be connected to the first lock hole, and the pin 43 is sequentially inserted into the second lock hole and the first lock hole that are interconnected. In this embodiment, the toggle rod 42 is slidably disposed on the mounting seat 41, which enables the toggle rod 42 to switch positions to meet the use requirements of construction personnel, and the pin 43 is sequentially inserted into the second lock hole and the first lock hole that are interconnected, which can fix the position of the toggle rod 42. Specifically, when the position of the movable frame 2 needs to be switched, the lever 42 is extended by sliding it, and the pin 43 is sequentially passed through one of the second lock holes and the first lock hole that are connected to each other, and the construction personnel can hold the extended lever 42 to operate, and after the position switching of the movable frame 2 is completed, the pin 43 is taken out and retracted by sliding the lever 42, and then the pin 43 is sequentially passed through another second lock hole and the first lock hole that are connected to each other, so that the lever 42 can be retracted. In a specific embodiment, the pin 43 is also provided with the locking rod 213 mentioned in the above content.

[0052] Please refer to Figure 2 and Figure 4 In an embodiment of the present utility model, a rope blocking rod 24 is provided on the movable frame 2, and the rope blocking rod 24 is located outside the pulley body 3. Specifically, the rope blocking rod 24 provided on the movable frame 2 can resist the lifting rope to prevent the lifting rope from disengaging from the rope guiding groove of the pulley body 3.

[0053] Please refer to Figure 2 In an embodiment of the present utility model, the tip pulley mounting structure 100 further includes a connecting rod 5, and the connecting rod 5 is used to connect the fixed frame 1 and the boom 300. Specifically, the fixed frame 1 is connected to the boom 300 through the connecting rod 5, which can reduce the difficulty of installing the tip pulley mounting structure 100 onto the boom 300. In a specific embodiment, the number of the connecting rods 5 is two, and the two connecting rods 5 are arranged at intervals. In this embodiment, the fixed frame 1 is formed with a receiving groove, and a part of the movable frame 2 is received in the receiving groove.

[0054] The present utility model also provides a crane. Please refer to Figure 6 This crane includes a vehicle body 200, a boom 300, a driving cylinder 400 and the above-mentioned tip pulley mounting structure 100. Among them, the boom 300 is movably arranged on the vehicle body 200, two ends of the driving cylinder 400 are respectively hinged to the vehicle body 200 and the boom 300, and the tip pulley mounting structure 100 is arranged at one end of the boom 300 away from the vehicle body 200. For the specific structure of the tip pulley mounting structure 100, refer to the above embodiment. Since this crane adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated herein one by one.

[0055] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. An arm tip pulley installation structure, characterized in that: include: A fixing frame (1), wherein the fixing frame (1) has a reference surface; A movable frame (2), the movable frame (2) being movably arranged on the fixed frame (1), and the movable frame (2) having a first working position and a second working position; A pulley body (3), wherein the pulley body (3) is arranged on the movable frame (2); When the movable frame (2) is in the first working position, part of the movable frame (2) and the pulley body (3) are both located below the reference plane, and the pulley body (3) is located on a side of the fixed frame (1) away from the boom (300); when the movable frame (2) is in the second working position, the movable frame (2) and the pulley body (3) are located above the reference plane.

2. The arm tip pulley mounting structure according to claim 1, characterized in that: The fixed frame (1) is provided with a first connecting hole (11) and two second connecting holes (12); the movable frame (2) is provided with a first connecting member (21) and a second connecting member (22); the first connecting member (21) is inserted into the first connecting hole (11); When the movable frame (2) is in the first working position, the second connecting member (22) is inserted into one of the second connecting holes (12); when the movable frame (2) is in the second working position, the second connecting member (22) is inserted into another of the second connecting holes (12).

3. The arm tip pulley mounting structure according to claim 2, characterized in that: The movable frame (2) is provided with a third connecting hole (23), and the third connecting hole (23) can be connected to any one of the second connecting holes (12), and the second connecting member (22) is sequentially inserted into the second connecting hole (12) and the third connecting hole (23) that are connected to each other.

4. The arm tip pulley mounting structure according to claim 1, characterized in that: The fixed frame (1) is provided with a first slide groove (13) and a second slide groove (14); the movable frame (2) is provided with a first connecting member (21) and a second connecting member (22); the first connecting member (21) is movably arranged in the first slide groove (13); the second connecting member (22) is movably arranged in the second slide groove (14); the first slide groove (13) has a first installation position (131) and a second installation position (132); the second slide groove (14) has a third installation position (141) and a fourth installation position (142); When the movable frame (2) is in the first working position, the first connecting member (21) is in the first installation position (131), and the second connecting member (22) is in the third installation position (141); when the movable frame (2) is in the second working position, when the first connecting member (21) is in the second installation position (132), the second connecting member (22) is in the fourth installation position (142).

5. The arm tip pulley mounting structure according to claim 4, characterized in that: One end of each of the first connecting member (21) and the second connecting member (22) is formed with a limiting portion (211), and the other end is provided with a pin hole, and a locking pin (212) is passed through the pin hole.

6. The arm tip pulley mounting structure according to any one of claims 1 to 4, characterized in that: The arm tip pulley mounting structure (100) further comprises a toggle assembly (4), wherein the toggle assembly (4) comprises a mounting seat (41) and a toggle rod (42), wherein the mounting seat (41) is arranged on the fixing frame (1), and the toggle rod (42) is arranged on the mounting seat (41).

7. The arm tip pulley mounting structure according to claim 6, characterized in that: The shifting assembly (4) further comprises a pin (43), the mounting seat (41) is provided with a first locking hole, the shifting rod (42) is slidably arranged on the mounting seat (41), and the shifting rod (42) is provided with a plurality of second locking holes, any one of the second locking holes can be connected to the first locking hole, and the pin (43) is sequentially inserted into the second locking holes and the first locking holes which are connected to each other.

8. The arm tip pulley mounting structure according to any one of claims 1 to 4, characterized in that: The movable frame (2) is provided with a rope blocking rod (24), and the rope blocking rod (24) is located outside the pulley body (3).

9. The arm tip pulley mounting structure according to any one of claims 1 to 4, characterized in that: The arm tip pulley mounting structure (100) further comprises a connecting rod (5), wherein the connecting rod (5) is used to connect the fixing frame (1) and the lifting arm (300).

10. A crane, characterized in that: include: body(200); A lifting arm (300), the lifting arm (300) being movably arranged on the vehicle body (200); A driving cylinder (400), two ends of which are respectively hinged to the vehicle body (200) and the lifting arm (300); The arm tip pulley mounting structure (100) according to any one of claims 1 to 9, wherein the arm tip pulley mounting structure (100) is arranged at an end of the lifting arm (300) away from the vehicle body (200).

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