Folding arm crane

Abstract

The utility model provides a folding arm crane which comprises a suspension arm, a hydraulic winch, a pulley connecting frame and a lifting hook, the hydraulic winch, the pulley connecting frame and the lifting hook are arranged on the suspension arm, a steel wire rope is wound on the hydraulic winch, a connecting assembly is arranged at the extending end of the steel wire rope, and connecting matching parts detachably connected with the connecting assembly are arranged on the pulley connecting frame and the lifting hook. The connecting assembly at least has a first connecting state, a second connecting state and a third connecting state, in the first connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the lifting hook and then is connected with the connecting matching part on the pulley connecting frame, and in the second connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the lifting hook and then is connected with the connecting matching part on the pulley connecting frame. In the third connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the lifting hook twice and then is connected with the connecting matching part on the pulley connecting frame. The folding arm crane disclosed by the utility model can solve the problem that a steel wire rope is broken due to overwinding.

Description

Technical Field

[0001] The utility model relates to the technical field of truck-mounted cranes, in particular to a folding arm crane. Background Art

[0002] Truck mounted cranes are mainly divided into two types: straight arm cranes and folding arm cranes according to their different structural forms. Straight arm cranes rely on a winch mechanism to complete lifting and can achieve vertical lifting of heavy objects. Folding arm cranes generally install the hook directly on the top arm, and the hook is fixed. During the lifting operation, it is necessary to repeatedly adjust the luffing cylinder, folding cylinder and boom telescopic action to change the hook position, which is not convenient for hooking and lifting heavy objects, and the operation is inconvenient and the work efficiency is low.

[0003] In addition, the hook of the existing folding arm crane is easy to knock against the boom during driving, which will cause certain damage to the boom over a long period of time. At the same time, the folding arm crane with a hoisting mechanism currently does not have an anti-overwinding function, which causes the wire rope to break easily after overwinding, causing harm to the safety of people and property. Utility Model Content

[0004] In view of this, the utility model aims to provide a folding arm crane, which solves the problem of wire rope breakage caused by overwinding of the folding arm crane by changing the lifting speed, thereby improving the safety of the device.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A folding arm crane comprises a boom, and a hydraulic winch, a pulley connecting frame and a hook arranged on the boom; a steel wire rope is wound on the hydraulic winch, a connecting assembly is arranged at the extended end of the steel wire rope, and a connecting matching part detachably connected to the connecting assembly is arranged on the pulley connecting frame and the hook;

[0007] The connecting assembly has at least a first connecting state, a second connecting state and a third connecting state; in the first connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the hook, and then connects to the connecting fitting part on the pulley connecting frame; in the second connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the hook, and then bypasses the pulley connecting frame again, and then connects to the connecting fitting part on the hook; in the third connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the hook twice, and then connects to the connecting fitting part on the pulley connecting frame.

[0008] Furthermore, the connection assembly includes a quick-change connector detachably connected to the connection fitting portion, and a connection block detachably connected to the quick-change connector, and the extended end of the wire rope is connected to the connection block.

[0009] Furthermore, the quick-change connector is provided with a first insertion hole, and each of the connecting fittings is provided with a second insertion hole, and the connecting component is connected to any of the connecting fittings via a pin passing through the first insertion hole and the corresponding second insertion hole.

[0010] Furthermore, a U-shaped groove is formed at one end of the quick-change connector, and the two groove side walls of the U-shaped groove are provided with the first insertion holes arranged correspondingly.

[0011] Furthermore, the quick-change connector is provided with an installation cavity arranged along its length direction, the installation cavity is connected to the U-shaped groove, and the side of the quick-change connector is provided with a groove connected to the installation cavity and used to avoid the wire rope, and the connecting block can slide into the installation cavity along one end of the U-shaped groove.

[0012] Furthermore, the hydraulic winch is screwed to the lower side of the boom; and / or the pulley connecting frame is connected to the boom via a pin.

[0013] Furthermore, a bracket is screwed on the lower side of the boom, the bracket is located between the hydraulic winch and the pulley connecting frame, and the bracket is provided with connecting shafts arranged at intervals up and down, and shaft sleeves rotatably arranged on each of the connecting shafts, and the wire rope is passed between the two groups of the shaft sleeves.

[0014] Furthermore, the hydraulic winch is provided with a fixing ring for the hook to hang.

[0015] Further, the hook is rotatably provided with at least two pulleys arranged side by side, and the hook is provided with a plurality of blocking members arranged at intervals along the circumference of each pulley, and when the steel wire rope passes around the hook, the steel wire rope is passed between each blocking member and at least one of the pulleys; and / or,

[0016] At least two pulleys are arranged side by side inside the pulley connecting frame, and at least one blocking member arranged on the upper side of the pulley is provided on the pulley connecting frame. When the steel wire rope passes around the pulley connecting frame, the steel wire rope is passed between the blocking member and at least one of the pulleys.

[0017] Furthermore, the boom also includes an auxiliary hook, and the auxiliary hook is detachably arranged on the boom.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The folding arm crane described in the utility model arranges the protruding end of the wire rope on the connecting component. By changing the connection state between the connecting component and the pulley connecting frame and the connecting component and the hook, the lifting rate of the device is changed, which can solve the problem of wire rope breakage caused by overwinding and improve the convenience of operation and the safety of the device.

[0020] Secondly, the quick-change connector is detachably connected to the connecting mating part, and the connecting block is detachably connected to the quick-change connector, which is convenient for disassembly and assembly, maintenance and replacement, and improves the convenience of assembly. The quick-change connector and each connecting mating part are connected by a latch, which is conducive to improving the connection stability and the convenience of disassembly and assembly between the two. The setting of the U-shaped groove has a reasonable structure and is convenient for the connection between the quick-change connector and the connecting mating part on the pulley connecting frame. The setting of the installation cavity can ensure the connection stability between the connecting block and the quick-change connector. At the same time, the installation cavity is connected to the U-shaped groove, which is convenient for the installation of the connecting block. In addition, the side of the quick-change connector is provided with a slot, which is conducive to forming an escape space for the wire rope.

[0021] Furthermore, the hydraulic winch is screwed to the lower side of the boom, and the pulley connecting frame is connected to the boom through a pin shaft, which is conducive to the convenience of disassembly and assembly of the hydraulic winch and the pulley connecting frame. The bracket is provided with a connecting shaft arranged at intervals up and down and a shaft sleeve rotatably arranged on the connecting shaft to lift the wire rope and prevent the wire rope from sagging and shaking due to the influence of gravity, which affects the normal operation of the device. By restricting the hook with a fixed ring, it can be prevented from hitting the boom during driving, thereby affecting the boom.

[0022] In addition, the hook and the pulley connecting frame are both provided with pulleys and blocking members, thereby limiting the position of the wire rope to prevent the wire rope from jumping out of the pulley groove and affecting the device, which is beneficial to the safety of the device. The setting of the auxiliary hook can achieve the effect of one machine with multiple uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the folding arm crane according to an embodiment of the utility model;

[0025] Figure 2 It is a partial structural schematic diagram of the folding arm crane according to an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the stowed state of the folding arm crane according to an embodiment of the utility model;

[0027] Figure 4This is a schematic diagram of the specific structure of the hook according to the embodiment of the utility model;

[0028] Figure 5 for Figure 4 a side view of the structure shown;

[0029] Figure 6 This is a schematic diagram of the specific structure of the pulley connecting frame according to an embodiment of the utility model;

[0030] Figure 7 This is a schematic diagram of the installation of the connection assembly and the pulley connection frame according to an embodiment of the utility model;

[0031] Figure 8 for Figure 7 A front view of the structure;

[0032] Fig. 9 This is a schematic diagram of the structure of the quick-change connector according to an embodiment of the utility model;

[0033] Fig.10 This is a schematic diagram of the structure of the bracket according to an embodiment of the utility model;

[0034] Fig.11 This is a structural schematic diagram of the hydraulic winch according to an embodiment of the utility model;

[0035] Fig.12 for Fig.11 a side view of the structure shown;

[0036] Fig.13 This is a schematic diagram of the installation of the auxiliary hook and the top arm according to an embodiment of the utility model;

[0037] Fig.14 This is a schematic diagram of the installation of the pulley connecting frame and the top arm according to an embodiment of the utility model;

[0038] Description of reference numerals:

[0039] 1. Boom; 11. Fixed arm; 12. Top arm; 13. Telescopic arm;

[0040] 2. Hydraulic winch; 21. Fixed ring;

[0041] 3. Pulley connecting frame; 4. Hook; 41. Stopping member; 42. Pulley; 5. Steel wire rope;

[0042] 6. Connecting assembly; 61. Quick-change connector; 611. First insertion hole; 612. U-shaped groove; 613. Mounting cavity; 614. Slot; 62. Connecting block;

[0043] 7. Connecting and matching portion; 71. Second insertion hole;

[0044] 8. bracket; 81. connecting shaft; 82. shaft sleeve;

[0045] 9. Auxiliary hook;

[0046] 10. Base; 101. Support arm; 102. Cantilever; 103. Turning cylinder; DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0048] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] Taking the folding arm crane described in the present utility model as an example, the directional words such as "up, down, front, and back" used in the embodiments are based on Figure 1 The definition is based on the up-down direction (also called the height direction) and the front-back direction (also called the length direction) in the shown state.

[0050] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connection assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0051] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0052] Embodiment 1

[0053] The present embodiment relates to a folding arm crane, which solves the problem of the wire rope 5 being broken due to overwinding of the folding arm crane by changing the lifting speed, thereby improving the safety of the device.

[0054] In terms of overall structure, Figure 1 and Figure 2As shown, the folding arm crane of this embodiment includes a boom 1, and a hydraulic winch 2, a pulley connecting frame 3 and a hook 4 arranged on the boom 1. At the same time, a steel wire rope 5 is wound on the hydraulic winch 2, and a connecting assembly 6 is provided at the extended end of the steel wire rope 5. The pulley connecting frame 3 and the hook 4 are both provided with a connecting mating part 7 that is detachably connected to the connecting assembly 6. This helps to improve the convenience of operation and facilitates the disassembly and assembly of the connecting assembly 6.

[0055] In addition, the connecting component 6 has at least a first connecting state, a second connecting state and a third connecting state. In the first connecting state, the connecting component 6 drives the wire rope 5 to bypass the pulley connecting frame 3 and the hook 4, and then connects to the connecting matching part 7 on the pulley connecting frame 3. In the second connecting state, the connecting component 6 drives the wire rope 5 to bypass the pulley connecting frame 3 and the hook 4, and then bypasses the pulley connecting frame 3 again, and then connects to the connecting matching part 7 on the hook 4. In the third connecting state, the connecting component 6 drives the wire rope 5 to bypass the pulley connecting frame 3 and the hook 4 twice, and then connects to the connecting matching part 7 on the pulley connecting frame 3.

[0056] Here, the protruding end of the wire rope 5 is arranged on the connecting component 6. By changing the connection state between the connecting component 6 and the pulley link frame 3, and the connecting component 6 and the hook 4, the lifting rate of the device is changed to solve the problem of the wire rope 5 being broken due to overwinding, which is beneficial to improving the safety of the device.

[0057] It is worth noting that the relevant structural parts not mentioned in the folding arm crane of this embodiment can all refer to the various structures of the folding arm crane products well known to those skilled in the art, such as the base 10, the support arm 101 arranged on the base 10, the cantilever 102 rotatably arranged on the support arm 101, the two tilting cylinders 103 hinged between the support arm 101 and the cantilever 102 and between the cantilever 102 and the boom 1, as well as the fixed arm 11, the multi-section telescopic arm 13 and the top section arm 12 that constitute the boom 1.

[0058] Based on the above overall introduction, in this embodiment, as a preferred implementation form, Figure 7 As shown, the connection assembly 6 includes a quick-change connector 61 detachably connected to the connection fitting portion 7 , and a connection block 62 detachably connected to the quick-change connector 61 , and the extended end of the steel wire rope 5 is connected to the connection block 62 .

[0059] It can be understood that the connecting assembly 6 is composed of a quick-change connector 61 and a connecting block 62, and the quick-change connector 61 and the connecting block 62 are both detachably connected, which not only facilitates the convenience of disassembly and assembly of the quick-change connector 61 and the connecting block 62, but also has a simple structure and is convenient for maintenance and replacement.

[0060] Furthermore, in this embodiment, as a preferred implementation form, Figure 7 and Figure 8As shown, the quick-change connector 61 is provided with a first insertion hole 611, and each connecting fitting part 7 is provided with a second insertion hole 71. The connecting component 6 is connected to any connecting fitting part 7 by a pin passing through the first insertion hole 611 and the corresponding second insertion hole 71.

[0061] Here, the connection component 6 and any connecting mating part 7 are connected via a pin inserted through the first insertion hole 611 and the corresponding second insertion hole 71, thereby improving the connection stability between the two and also improving the convenience of assembly and disassembly.

[0062] In addition, in this embodiment, as a preferred implementation form, Figure 7 and Figure 8 As shown, a U-shaped groove 612 is formed at one end of the quick-change connector 61, and corresponding first insertion holes 611 are arranged on the two side walls of the U-shaped groove 612. Here, the setting of the U-shaped groove 612 is structurally reasonable, which facilitates the connection between the quick-change connector 61 and the connecting fitting portion 7 on the pulley connecting frame 3.

[0063] During specific implementation, the quick-change connector 61 is connected to the connecting fitting portion 7 of the pulley connecting frame 3 through a pin, and the pin passes through the first insertion hole 611 on the two groove side walls and the second insertion hole 71 of the connecting fitting portion 7 on the pulley connecting frame 3 to fix the quick-change connector 61 and the above-mentioned connecting fitting portion 7.

[0064] To elaborate, in this embodiment, as a preferred implementation form, the quick-change connector 61 is provided with an installation cavity 613 arranged along its own length direction, the installation cavity 613 is connected to the U-shaped groove 612, and the side of the quick-change connector 61 is provided with a groove 614 connected to the installation cavity 613 and used to avoid the wire rope 5, and the connecting block 62 can slide into the installation cavity 613 along one end of the U-shaped groove 612.

[0065] Here, the setting of the installation cavity 613 can ensure the connection stability between the connecting block 62 and the quick-change connector 61. At the same time, the installation cavity 613 is connected to the U-shaped groove 612 to facilitate the installation of the connecting block 62. In addition, a groove 614 is provided on the side of the quick-change connector 61, which is conducive to forming an escape space for the wire rope 5.

[0066] In addition, in this embodiment, as a preferred implementation form, Figure 2 As shown, the hydraulic winch 2 is screwed to the lower side of the boom 1, and the pulley connecting frame 3 is connected to the boom 1 through a pin. In specific implementation, the hydraulic winch 2 is screwed to the fixed arm 11, and the pulley connecting frame 3 is connected to the top arm 12 through a pin. This arrangement is conducive to improving the convenience of disassembly and assembly of the hydraulic winch 2 and the pulley connecting frame 3.

[0067] Secondly, in this embodiment, as a preferred implementation form, Figure 1 and Figure 2 As shown, a bracket 8 is screwed on the lower side of the boom 1, the bracket 8 is located between the hydraulic winch 2 and the pulley connecting frame 3, and the bracket 8 is provided with connecting shafts 81 arranged at intervals up and down, and shaft sleeves 82 rotatably arranged on each connecting shaft 81, and the wire rope 5 is passed between the two sets of shaft sleeves 82.

[0068] The advantage of such an arrangement is that the steel wire rope 5 can be lifted to prevent the steel wire rope 5 from sagging and shaking due to the influence of gravity, thereby affecting the normal operation of the device.

[0069] Furthermore, as a preferred implementation form, Fig.11 and Fig.12 As shown, the hydraulic winch 2 of this embodiment is provided with a fixing ring 21 for the hook 4 to be hooked, thereby the hook 4 can be restricted by the fixing ring 21 to prevent the hook 4 from shaking during driving, thereby preventing it from hitting the boom 1 and affecting the boom 1.

[0070] When implementing it, Figure 1 and Figure 3 As shown, when the folding arm crane is in an unfolded state, the hook 4 can be hooked on the fixing ring 21 , and when the folding arm crane is retracted, the hook 4 can be clamped on the pulley connecting frame 3 .

[0071] Furthermore, in this embodiment, as a preferred implementation form, Figure 5 As shown, at least two pulleys 42 are rotatably arranged side by side on the hook 4, and a plurality of blocking members 41 are arranged at intervals along the circumference of each pulley 42 on the hook 4. When the wire rope 5 passes around the hook 4, the wire rope 5 is passed between each blocking member 41 and at least one of the pulleys 42.

[0072] At the same time, if Fig.14 As shown, at least two pulleys 42 are arranged side by side inside the pulley connecting frame 3, and at least one blocking member 41 is arranged on the upper side of the pulley 42 on the pulley connecting frame 3. When the wire rope 5 passes around the pulley connecting frame 3, the wire rope 5 is passed between the blocking member 41 and at least one of the pulleys 42.

[0073] Here, there are pulleys 42 and blocking members 41 on the hook 4 and the pulley connecting frame 3, thereby limiting the position of the wire rope 5 to prevent the wire rope 5 from jumping out of the pulley groove and affecting the device, which is beneficial to the safety of the use of the lifting device.

[0074] In specific implementation, the blocking member 41 on the hook 4 can be specifically set to three, respectively arranged on the left, lower and right sides of the pulley 42, so as to limit the wire rope 5 in the pulley groove, and the blocking member 41 on the pulley connecting frame 3 can be set to one, that is, the wire rope 5 is limited.

[0075] In addition, in this embodiment, as a preferred implementation form, the boom 1 further includes an auxiliary hook 9, and the auxiliary hook 9 is detachably arranged on the boom 1. Here, the arrangement of the auxiliary hook 9 can achieve the effect of one machine with multiple uses.

[0076] When implementing it, Figure 1 and Fig.13 As shown, the auxiliary hook 9 is screwed to the lower side of the fixed arm 11 and is located between the cantilever 102 and the hydraulic winch 2. When the hydraulic winch 2 and the pulley connecting frame 3 are removed, the auxiliary hook 9 can be installed on the top arm 12.

[0077] The folding arm crane of this embodiment, when at a 2x ratio, one end of the wire rope 5 is wound around the hydraulic winch 2, and the other end of the wire rope 5 passes through the bracket 8, passes around the pulley connecting frame 3 and the pulley 42 in the hook 4, and is connected to the connecting block 62, and is installed together with the connecting block 62 in the mounting cavity 613 of the quick-change joint 61, and finally the quick-change joint 61 is connected to the connecting mating part 7 of the pulley connecting frame 3.

[0078] When it is necessary to switch from a 2x ratio to a 3x ratio, the quick-change connector 61 needs to be removed from the connecting fitting portion 7 of the pulley connecting frame 3, and the connecting block 62 needs to be taken out from the quick-change connector 61, thereby driving the wire rope 5 to bypass the pulley connecting frame 3 again on the basis of the 2x ratio connection state, and then be installed in the quick-change connector 61, and then connected together to the connecting fitting portion 7 of the hook 4.

[0079] When it is necessary to switch from the 3x ratio to the 4x ratio, the quick-change connector 61 needs to be removed from the connecting fitting part 7 of the hook 4, and the connecting block 62 needs to be taken out from the quick-change connector 61, so as to drive the wire rope 5 to bypass the hook 4 again on the basis of the 3x ratio connection state, and then be installed in the quick-change connector 61, and then connected together to the connecting fitting part 7 of the pulley connecting frame 3.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A folding arm crane, characterized in that: It includes a boom, and a hydraulic winch, a pulley connecting frame and a hook arranged on the boom; A steel wire rope is wound on the hydraulic winch, a connecting assembly is provided at the outwardly extending end of the steel wire rope, and a connecting matching portion detachably connected to the connecting assembly is provided on the pulley connecting frame and the hook; The connecting assembly has at least a first connecting state, a second connecting state and a third connecting state; in the first connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the hook, and then connects to the connecting fitting part on the pulley connecting frame; in the second connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the hook, and then bypasses the pulley connecting frame again, and then connects to the connecting fitting part on the hook; in the third connecting state, the connecting assembly drives the steel wire rope to bypass the pulley connecting frame and the hook twice, and then connects to the connecting fitting part on the pulley connecting frame.

2. The folding arm crane according to claim 1, characterized in that: The connection assembly comprises a quick-change joint detachably connected to the connection fitting portion, and a connection block detachably connected to the quick-change joint, and the extended end of the steel wire rope is connected to the connection block.

3. The folding arm crane according to claim 2, characterized in that: The quick-change connector is provided with a first insertion hole, and each of the connecting fittings is provided with a second insertion hole. The connecting assembly is connected to any of the connecting fittings via a pin passing through the first insertion hole and the corresponding second insertion hole.

4. The folding arm crane according to claim 3, characterized in that: A U-shaped groove is formed at one end of the quick-change connector, and the two groove side walls of the U-shaped groove are provided with the first insertion holes arranged correspondingly.

5. The folding arm crane according to claim 4, characterized in that: The quick-change connector has an installation cavity arranged along its length direction, the installation cavity is connected to the U-shaped groove, and the side of the quick-change connector is provided with a groove connected to the installation cavity and used to avoid the wire rope, and the connecting block can slide into the installation cavity along one end of the U-shaped groove.

6. The folding arm crane according to claim 1, characterized in that: The hydraulic winch is screwed to the lower side of the boom; and / or the pulley connecting frame is connected to the boom via a pin.

7. The folding arm crane according to claim 1, characterized in that: A bracket is screwed on the lower side of the boom, and the bracket is located between the hydraulic winch and the pulley connecting frame. The bracket is provided with connecting shafts spaced apart from each other, and shaft sleeves rotatably arranged on each of the connecting shafts, and the steel wire rope is passed between two groups of the shaft sleeves.

8. The folding arm crane according to claim 3, characterized in that: The hydraulic winch is provided with a fixing ring for the hook to hang.

9. The folding arm crane according to claim 1, characterized in that: The hook is rotatably provided with at least two pulleys arranged side by side, and the hook is provided with a plurality of blocking members arranged at intervals along the circumference of each pulley, and when the steel wire rope passes around the hook, the steel wire rope is passed between each blocking member and at least one of the pulleys; and / or, At least two pulleys are arranged side by side inside the pulley connecting frame, and at least one blocking member arranged on the upper side of the pulley is provided on the pulley connecting frame. When the steel wire rope passes around the pulley connecting frame, the steel wire rope is passed between the blocking member and at least one of the pulleys.

10. The folding arm crane according to claim 6, characterized in that: The boom also includes an auxiliary hook, which is detachably arranged on the boom.

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