Crane boom and hoisting machinery

Abstract

The utility model relates to the field of hoisting, and discloses a hoisting arm and hoisting machinery. The cargo boom comprises a first arm, a second arm, a third arm, a fourth arm and a fifth arm which are sequentially connected in a sliding mode, and a connecting part is arranged on the outer side wall of the first arm; the telescopic oil cylinder is respectively connected with the first arm and the second arm; the first extension rope wheel assembly is connected with the driving end, the first arm and the third arm and used for driving the third arm to extend out; the first retraction rope wheel assembly is arranged on the side wall, away from the connecting part, of the second arm, is connected with the first arm and the third arm and is used for driving the third arm to retract; the first telescopic rope wheel assembly is arranged on the side wall, away from the connecting part, of the third arm, connected with the second arm and the fourth arm and used for driving the fourth arm to stretch out and draw back. The second telescopic rope wheel assembly is arranged on the side wall, away from the connecting part, of the fourth arm, connected with the third arm and the fifth arm and used for driving the fifth arm to stretch out and draw back. The rope wheel assembly is arranged on the side wall, away from the connecting part, of the corresponding knuckle arm, and the influence of distance reduction caused by knuckle arm deformation on the rope wheel assembly can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to hoisting technology field, concretely relates to hoisting arm and hoisting machinery. BACKGROUND

[0002] In the modern engineering construction field, hoisting machinery plays a vital role. Hoisting machinery is usually equipped with telescopic and liftable hoisting arms, which are mainly composed of a telescopic cylinder and five slidingly connected section arms. The working principle is that the telescopic cylinder directly pushes and pulls one of the section arms to realize telescopic action, and the remaining three section arms are respectively driven by corresponding pulley mechanisms to realize telescopic operation. This design can effectively meet the demand for length adjustment of the hoisting arm under different working conditions.

[0003] However, in actual application, when the hoisting arm hoists a heavy object, the hoisting arm will inevitably deform due to the gravity of the heavy object. This deformation will break the original positional relationship between the pulley mechanism and the section arm, causing interference between the rope body or the pulley of the pulley mechanism and the section arm. Once interference occurs, the telescopic process of the hoisting arm will be jammed. SUMMARY

[0004] Therefore, the utility model provides a hoisting arm and hoisting machinery to solve or improve the interference between the pulley mechanism and the section arm during hoisting a heavy object.

[0005] In a first aspect, the utility model provides a hoisting arm, comprising:

[0006] a first arm, a second arm, a third arm, a fourth arm and a fifth arm connected in sequence, the outer side wall of the first arm is provided with a connecting part for connecting with a lifting cylinder;

[0007] a telescopic cylinder, the fixed end of the telescopic cylinder is connected with the first arm, and the driving end of the telescopic cylinder is connected with the second arm;

[0008] a first extension rope wheel assembly connected with the driving end, the first arm and the third arm respectively and used for driving the third arm to extend;

[0009] a first retraction rope wheel assembly arranged on the side wall of the second arm away from the connecting part and connected with the first arm and the third arm respectively and used for driving the third arm to retract;

[0010] a first telescopic rope wheel assembly arranged on the side wall of the third arm away from the connecting part and connected with the second arm and the fourth arm respectively and used for driving the fourth arm to telescope;

[0011] a second telescopic rope wheel assembly arranged on the side wall of the fourth arm away from the connecting part and connected with the third arm and the fifth arm respectively and used for driving the fifth arm to telescope.

[0012] In an alternative embodiment, the first extension cable assembly comprises:

[0013] a first extension wheel rotatably mounted on the driving end;

[0014] a first extension cable wound around the first extension wheel and having two ends connected to the tail end of the first arm and the tail end of the third arm, respectively.

[0015] In an alternative embodiment, the first retraction cable assembly comprises:

[0016] a first retraction wheel rotatably mounted on the tail end of the second arm away from the side wall of the connecting portion;

[0017] a first retraction cable wound around the first retraction wheel and having two ends connected to the tail end of the third arm and the head end of the first arm, respectively.

[0018] In an alternative embodiment, the first retraction cable assembly further comprises a first fixing seat arranged on the side of the second arm away from the connecting portion and connected to the head end of the first arm, and the end of the first retraction cable away from the third arm is arranged between the first arm and the second arm and connected to the first fixing seat.

[0019] In an alternative embodiment, the first extension cable assembly comprises:

[0020] a second extension wheel rotatably mounted on the head end of the third arm away from the side wall of the connecting portion;

[0021] a second extension cable wound around the second extension wheel and having two ends connected to the tail end of the fourth arm and the head end of the second arm, respectively;

[0022] a second retraction wheel rotatably mounted on the tail end of the third arm away from the side wall of the connecting portion;

[0023] a second retraction cable wound around the second retraction wheel and having two ends connected to the tail end of the fourth arm and the head end of the second arm, respectively.

[0024] In an alternative embodiment, the first extension cable assembly further comprises:

[0025] a second fixing seat connected to the head end of the second arm, and the second extension cable is connected to the second fixing seat;

[0026] and / or a third fixing seat arranged on the side of the third arm away from the connecting portion and connected to the head end of the second arm, and the end of the second retraction cable away from the fourth arm is arranged between the second arm and the third arm and connected to the third fixing seat.

[0027] In an alternative embodiment, the second telescopic rope wheel assembly comprises:

[0028] a third elongated wheel rotatably mounted on the side wall of the fourth arm distal to the connecting portion;

[0029] a third elongated rope wound on the third elongated wheel and having two ends connected to the tail end of the fifth arm and the head end of the third arm, respectively;

[0030] a third retraction wheel rotatably mounted on the side wall of the fourth arm distal to the connecting portion;

[0031] a third retraction rope wound on the third retraction wheel and having two ends connected to the tail end of the fifth arm and the head end of the third arm, respectively.

[0032] In an alternative embodiment, the second telescopic rope wheel assembly further comprises:

[0033] a fourth fixed seat connected to the head end of the third arm, the third elongated rope being connected to the fourth fixed seat;

[0034] and / or a fifth fixed seat provided on the side of the fifth arm distal to the connecting portion and connected to the head end of the third arm, the end of the third retraction rope distal to the fifth arm being provided between the third arm and the fourth arm and connected to the fifth fixed seat.

[0035] In a second aspect, the utility model further provides a hoisting machine, which comprises:

[0036] a vehicle frame;

[0037] a hoisting arm as described above, the arm being rotatably arranged on the vehicle frame;

[0038] a lifting oil cylinder, one end of the lifting oil cylinder being rotatably connected to the vehicle frame, and the other end of the lifting oil cylinder being rotatably connected to the connecting portion of the arm.

[0039] In an alternative embodiment, the hoisting machine further comprises:

[0040] a support leg assembly telescopically arranged on the vehicle frame;

[0041] a slewing assembly rotatably arranged on the support leg assembly, the arm being rotatably connected to the slewing assembly, and the lifting oil cylinder being connected between the slewing assembly and the arm.

[0042] The lifting boom provided by this utility model has the first retractable rope sheave assembly, the first telescopic rope sheave assembly, and the second telescopic rope sheave assembly respectively set on the side wall of the second, third, and fourth booms away from the connecting part (i.e. away from the lifting cylinder). When the lifting boom is under load, the side closer to the connecting part is compressed, which reduces the distance between adjacent boom sections on the side closer to the connecting part, while the side away from the connecting part is stretched, which increases the distance between adjacent boom sections on the side away from the connecting part. Therefore, setting the rope sheave assembly on the side wall of the corresponding boom section away from the connecting part can avoid the impact of the reduced distance caused by boom deformation on the rope sheave assembly.

[0043] The lifting machinery provided by this utility model includes the lifting boom provided by this utility model, and therefore includes all the advantages of the lifting boom mentioned above. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 A schematic diagram of the structure of a lifting arm provided for an embodiment of this utility model;

[0046] Figure 2 for Figure 1 A three-dimensional angle diagram of the crane boom shown;

[0047] Figure 3 for Figure 2 Other angle views of the crane boom shown;

[0048] Figure 4 A schematic cross-sectional view of the lifting arm provided in an embodiment of this utility model;

[0049] Figure 5 A schematic diagram of the lifting arm provided for an embodiment of this utility model;

[0050] Figure 6 This is a schematic diagram of the installation state of the lifting boom provided for an embodiment of the present utility model.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1, one arm; 101, connecting part; 2, two arms; 3, three arms; 4, four arms; 5, five arms; 6, first elongated rope wheel assembly; 601, first elongated wheel; 602, first elongated rope; 7, first retractable rope wheel assembly; 701, first retractable wheel; 702, first retractable rope; 703, first fixed seat; 8, first telescopic rope wheel assembly; 801, second elongated wheel; 802, second elongated rope; 803, second retractable wheel; 804, second retractable rope; 805, second fixed seat; 806, third fixed seat; 9, second telescopic rope wheel assembly; 901, third elongated wheel; 902, third elongated rope; 903, third retractable wheel; 904, third retractable rope; 905, fourth fixed seat; 9051, side plate; 9052, connecting plate; 906, fifth fixed seat; 10, lifting oil cylinder; 11, telescopic oil cylinder; 1101, fixed end; 1102, driving end; 12, support leg assembly; 13, slewing assembly. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0054] In the related art, the hoisting machinery is usually equipped with a telescopic and liftable hoisting arm, the lower side of the hoisting arm is connected with the lifting oil cylinder, and the hoisting arm is driven to swing up and down by the lifting oil cylinder. The hoisting arm is mainly composed of a telescopic cylinder and five sequentially slidingly connected section arms. The working principle is that the telescopic cylinder directly pushes and pulls one of the section arms to realize telescopic action, and the remaining three section arms are respectively driven to perform telescopic operation by corresponding pulley mechanisms. This design can effectively meet the demand for length adjustment of the hoisting arm under different working conditions.

[0055] However, in the actual application process, when the hoisting arm hoists a heavy object, the hoisting arm will inevitably be deformed due to the gravity of the heavy object. The pulley mechanism is usually arranged on the lower side of the corresponding section arm, i.e. the side of the section arm close to the lifting oil cylinder. In the process of deformation of the section arm, the distance between the adjacent section arms close to the lifting oil cylinder becomes smaller, resulting in a smaller distance between the section arm and the pulley mechanism, which causes interference between the rope body or the pulley of the pulley mechanism and the section arm. Once the interference occurs, the telescopic process of the hoisting arm will appear to be jammed.

[0056] In order to solve or improve the interference problem between the pulley mechanism and the section arm in the process of hoisting a heavy object, the present application provides a hoisting arm and a hoisting machinery.

[0057] The embodiments of the utility model are described below in combination with Figures 1 to 6 The lifting arm provided by the embodiments of the utility model.

[0058] Specifically, the lifting arm comprises five layers of sectional arms, namely, a first arm 1, a second arm 2, a third arm 3, a fourth arm 4 and a fifth arm 5. The first arm 1, the second arm 2, the third arm 3, the fourth arm 4 and the fifth arm 5 are sequentially connected in sliding mode, for example, the first arm 1, the second arm 2, the third arm 3, the fourth arm 4 and the fifth arm 5 are sequentially sleeved from outside to inside. The outer side wall of the first arm 1 is provided with a connecting part 101 for connecting with a lifting oil cylinder 10, for example, the connecting part 101 is provided with a connecting hole, and the connecting part 101 is rotationally connected with the lifting oil cylinder 10.

[0059] Further, the lifting arm further comprises a telescopic oil cylinder 11, a first lengthening rope wheel assembly 6, a first retracting rope wheel assembly 7, a first telescopic rope wheel assembly 8 and a second telescopic rope wheel assembly 9.

[0060] The fixed end 1101 of the telescopic oil cylinder 11 is connected with the first arm 1, and the driving end 1102 of the telescopic oil cylinder 11 is connected with the second arm 2. For example, the piston rod of the telescopic oil cylinder 11 can be connected with the first arm 1 as the fixed end 1101, and the cylinder body of the telescopic oil cylinder 11 can be connected with the second arm 2 as the driving end 1102, and of course the reverse is also possible. During the telescopic process of the telescopic oil cylinder 11, the second arm 2 can be directly driven to telescope relative to the first arm 1.

[0061] The first lengthening rope wheel assembly 6 is connected with the driving end 1102, the first arm 1 and the third arm 3 respectively, and is used for driving the third arm 3 to extend.

[0062] The first retracting rope wheel assembly 7 is arranged on the side wall of the second arm 2 away from the connecting part 101, and the first retracting rope wheel assembly 7 is further connected with the first arm 1 and the third arm 3 respectively, and is used for driving the third arm 3 to retract.

[0063] The first telescopic rope wheel assembly 8 is arranged on the side wall of the third arm 3 away from the connecting part 101, and the first telescopic rope wheel assembly 8 is further connected with the second arm 2 and the fourth arm 4 respectively, and is used for driving the fourth arm 4 to telescope.

[0064] The second telescopic rope wheel assembly 9 is arranged on the side wall of the fourth arm 4 away from the connecting part 101, and the second telescopic rope wheel assembly 9 is further connected with the third arm 3 and the fifth arm 5 respectively, and is used for driving the fifth arm 5 to telescope.

[0065] In the embodiment, the first retraction rope wheel assembly 7, the first telescopic rope wheel assembly 8 and the second telescopic rope wheel assembly 9 are arranged on the side wall of the second arm 2, the third arm 3 and the fourth arm 4 away from the connecting part 101 (i.e. away from the lifting oil cylinder 10) respectively. When the lifting arm is in bearing, the side close to the connecting part 101 is pressed, so that the distance between the adjacent section arms on the side close to the connecting part 101 is reduced, and the side away from the connecting part 101 is pulled, so that the distance between the adjacent section arms on the side away from the connecting part 101 is increased. Therefore, arranging the rope wheel assembly on the side wall of the corresponding section arm away from the connecting part 101 can avoid the influence of the distance reduction caused by the deformation of the section arm on the rope wheel assembly, and reduce the interference problem.

[0066] In addition, the telescoping of each layer of section arms is driven by independent rope wheel assemblies, and the rope wheel assemblies are all distributed on the side of the section arm away from the connecting part 101. Even if a certain section arm deforms, the driving path of other section arms is less affected, avoiding the overall jamming caused by a single deformation point. In addition, the pulley assembly of the hierarchical drive can reduce the stroke and load of a single rope body, and reduce the possibility of jamming.

[0067] In some embodiments of the utility model, the first elongation rope wheel assembly 6 includes a first elongation wheel 601 and a first elongation rope 602.

[0068] Specifically, the end of the driving end 1102 away from the fixed end 1101 extends into the third arm 3, and the first elongation wheel 601 is mounted on the part of the driving end 1102 located in the third arm 3. Optionally, a guide frame is usually arranged on the driving end 1102, and a guide wheel is arranged on the guide frame and slidably matched with the inner wall of the section arm to support the driving end 1102, and the first elongation wheel 601 can be mounted on the guide frame.

[0069] The first elongation rope 602 is wound on the first elongation wheel 601, and the two ends are connected with the tail end of the first arm 1 and the tail end of the third arm 3 respectively, that is, one end of the first elongation rope 602 is connected with the tail end of the third arm 3, and the other end is wound around the first elongation wheel 601 and connected with the tail end of the first arm 1. It can be understood that in the present application, the tail end of the section arm refers to the end of the section arm close to the position of the connection between the lifting arm and the frame, and the head end of the section arm refers to the end of the section arm away from the position of the connection between the lifting arm and the frame.

[0070] In the embodiment, during the elongation process of the telescopic oil cylinder 11, the first elongation rope 602 generates a pulling force, and under the action of the pulling force of the first elongation rope 602, the third arm 3 slides towards the head end relative to the second arm 2 to complete the elongation action. The two ends of the first elongation rope 602 are fixed at the tail ends of the first arm 1 and the third arm 3, the winding path is inside the section arm, and the movement of the driving end 1102 of the telescopic oil cylinder 11 directly drives the rope wheel to act, so that the transmission efficiency is high and the occupied space is small.

[0071] In some embodiments of the utility model, the first retraction rope wheel assembly 7 comprises a first retraction wheel 701 and a first retraction rope 702.

[0072] The first retraction wheel 701 is rotatably mounted on the side wall of the tail end of the second arm 2 away from the connecting part 101.

[0073] The first retraction rope 702 is wound on the first retraction wheel 701, and the two ends are connected with the tail end of the third arm 3 and the head end of the first arm 1 respectively. That is, one end of the first retraction rope 702 is connected with the tail end of the third arm 3, the other end passes through the first retraction wheel 701 and is connected with the head end of the first arm 1.

[0074] In this embodiment, when the driving end 1102 of the telescopic oil cylinder 11 is retracted inward relative to the fixed end 1101, the second arm 2 moves inward with the driving end 1102, drives the first retraction wheel 701 mounted at the tail end of the second arm 2 to move synchronously, thereby pulling the first retraction rope 702 and generating a retraction force on the tail end of the third arm 3 to the inside of the first arm 1.

[0075] In addition, arranging the first retraction wheel 701 and the first retraction rope 702 on the side of the second arm 2 away from the connecting part 101 can avoid the problem of rope blockage caused by the deformation of the joint arm under pressure.

[0076] In some embodiments of the utility model, the first retraction rope wheel assembly 7 further comprises a first fixing seat 703.

[0077] The first fixing seat 703 is arranged on the side of the second arm 2 away from the connecting part 101 and is connected with the head end of the first arm 1, for example, the first fixing seat 703 is connected to the inner wall of the first arm 1. The end of the first retraction rope 702 away from the third arm 3 is arranged between the first arm 1 and the second arm 2 and is connected with the first fixing seat 703.

[0078] In this embodiment, the first retraction rope 702 starts from the tail end of the third arm 3, passes through the first retraction wheel 701, enters between the first arm 1 and the second arm 2, and is fixed through the first fixing seat 703. The path is constrained on the inside of the joint arm, reducing friction with the external structure, and avoiding the winding or deviation of the rope caused by the relative movement of the joint arm during extension and retraction.

[0079] Optionally, the end of the first retraction rope 702 is connected with a screw rod, the screw rod passes through the first fixing seat 703 and is connected with a nut. In this embodiment, the rope tension can be adjusted axially along the screw rod by rotating the nut. For example, when the nut is tightened, the screw rod pulls the rope to tighten and increase the pre-tightening force, avoiding the relaxation of the rope caused by long-term use; loosening the nut can release the tension to adapt to the driving demand under different working conditions.

[0080] In some embodiments of the utility model, the first telescopic rope wheel assembly 8 includes a second elongation wheel 801, a second elongation rope 802, a second retraction wheel 803 and a second retraction rope 804.

[0081] The second elongation wheel 801 is rotatably mounted on the side wall of the first end of the three-arm 3 away from the connecting part 101.

[0082] The second elongation rope 802 is wound on the second elongation wheel 801, and the two ends are connected with the tail end of the four-arm 4 and the first end of the two-arm 2 respectively. For example, one end of the second elongation rope 802 is connected with the tail end of the four-arm 4, and the other end is wound through the second elongation wheel 801 and connected with the first end of the two-arm 2.

[0083] The second retraction wheel 803 is rotatably mounted on the side wall of the tail end of the three-arm 3 away from the connecting part 101.

[0084] The second retraction rope 804 is wound on the second retraction wheel 803, and the two ends are connected with the tail end of the four-arm 4 and the first end of the two-arm 2 respectively. For example, one end of the second retraction rope 804 is connected with the tail end of the four-arm 4, and the other end is wound through the second retraction wheel 803 and connected with the first end of the two-arm 2.

[0085] In this embodiment, the second elongation rope 802 connects the first end of the two-arm 2 and the tail end of the four-arm 4 by winding the second elongation wheel 801, and when the driving end 1102 drives the three-arm 3 to move, the four-arm 4 can be stretched out through the second elongation rope 802.

[0086] The second retraction rope 804 connects the first end of the two-arm 2 and the tail end of the four-arm 4 through the second retraction wheel 803, and when the three-arm 3 is retracted, the four-arm 4 is pulled to the two-arm 2 through the second retraction rope 804.

[0087] In this way, the second elongation rope 802, the second elongation wheel 801, the second retraction wheel 803 and the second retraction rope 804 are arranged in the area away from the connecting part 101, which can avoid the interference between the rope wheel assembly and the section arm when the lifting arm is pressed and deformed. The stretching and retracting of the four-arm 4 is completely controlled by the linkage of the two-arm 2 and the three-arm 3, and by setting the length ratio of the ropes, the synchronous speed of the multi-section arm stretching and retracting can be ensured, and the jamming or misplacement can be prevented.

[0088] In some embodiments of the utility model, the first telescopic rope wheel assembly 8 further includes a second fixed seat 805.

[0089] The second fixed seat 805 is connected with the first end of the two-arm 2, and the second elongation rope 802 is connected with the second fixed seat 805. For example, the second fixed seat 805 is mounted on the outer side wall of the first end of the two-arm 2.

[0090] In the embodiment, the second fixed seat 805 is installed on the outer side wall of the first end of the second arm 2 to provide a firm anchoring point for the second elongated rope 802, so that the rope body is prevented from deviating or shaking under stress, and the transmission process is stable and reliable. In addition, the second fixed seat 805 can be installed in advance as a prefabricated module on the first end of the second arm 2, and the connection with the second elongated rope 802 does not require disassembly of other arm segment components, which is suitable for on-site rapid assembly requirements.

[0091] Optionally, the end of the second elongated rope 802 is connected with a screw rod, the screw rod penetrates through the second fixed seat 805 and is connected with a nut. In the embodiment, the rope tension can be adjusted axially along the screw rod by rotating the nut. For example, when the nut is tightened, the screw rod pulls the rope body to tighten and increase the pre-tightening force, so that the rope body is prevented from relaxing due to long-term use; and when the nut is loosened, the tension can be released to adapt to the driving requirements under different working conditions.

[0092] In some embodiments of the utility model, the first telescopic rope wheel assembly 8 further includes a third fixed seat 806.

[0093] The third fixed seat 806 is arranged on the side of the third arm 3 away from the connecting part 101 and is connected with the first end of the second arm 2. For example, the third fixed seat 806 can be arranged between the third arm 3 and the second arm 2 and is connected with the inner side wall of the second arm 2. The end of the second retractable rope 804 away from the fourth arm 4 penetrates between the second arm 2 and the third arm 3 and is connected with the third fixed seat 806.

[0094] In the embodiment, the second retractable rope 804 starts from the tail end of the fourth arm 4, penetrates between the second arm 2 and the third arm 3 after passing the second retractable wheel 803, and is fixed through the third fixed seat 806. The path is constrained on the inner side of the segment arm, the friction with the external structure is reduced, and the rope body is prevented from being wound or deviated due to the relative movement of the segment arm during extension and contraction.

[0095] Optionally, the end of the second retractable rope 804 is connected with a screw rod, the screw rod penetrates through the third fixed seat 806 and is connected with a nut. In the embodiment, the rope tension can be adjusted axially along the screw rod by rotating the nut. For example, when the nut is tightened, the screw rod pulls the rope body to tighten and increase the pre-tightening force, so that the rope body is prevented from relaxing due to long-term use; and when the nut is loosened, the tension can be released to adapt to the driving requirements under different working conditions.

[0096] In some embodiments of the utility model, the second telescopic rope wheel assembly 9 includes a third elongated wheel 901, a third elongated rope 902, a third retractable wheel 903 and a third retractable rope 904.

[0097] The third elongated wheel 901 is rotatably installed on the side wall of the first end of the fourth arm 4 away from the connecting part 101.

[0098] The third elongated rope 902 is wound around the third elongated wheel 901, and two ends are connected with the tail end of the five-arm 5 and the head end of the three-arm 3 respectively. For example, one end of the third elongated rope 902 is connected with the tail end of the five-arm 5, and the other end is wound around the third elongated wheel 901 and connected with the head end of the three-arm 3.

[0099] The third retracting wheel 903 is rotatably installed on the tail end of the four-arm 4 away from the side wall of the connecting part 101.

[0100] The third retracting rope 904 is wound around the third retracting wheel 903, and two ends are connected with the tail end of the five-arm 5 and the head end of the three-arm 3 respectively. For example, one end of the third retracting rope 904 is connected with the tail end of the five-arm 5, and the other end is wound around the third retracting wheel 903 and connected with the head end of the three-arm 3.

[0101] In the embodiment, the third elongated rope 902 connects the head end of the three-arm 3 and the tail end of the five-arm 5 through the third elongated wheel 901 at the head end of the four-arm 4, and is used to drive the five-arm 5 to stretch out. The third retracting rope 904 connects the head end of the three-arm 3 and the tail end of the five-arm 5 through the third retracting wheel 903 at the tail end of the four-arm 4, and is used to drive the five-arm 5 to retract.

[0102] In this way, the third elongated rope 902, the third elongated wheel 901, the third retracting wheel 903 and the third retracting rope 904 are arranged in the area away from the connecting part 101, so that the interference between the rope wheel assembly and the section arm can be avoided when the lifting arm is pressed and deformed. The stretching and retracting of the five-arm 5 is completely controlled by the linkage of the three-arm 3 and the four-arm 4, and the speed synchronization of the stretching and retracting of the multi-section arm can be ensured by setting the rope length ratio matching, so that the jamming or misplacement can be prevented.

[0103] In some embodiments of the utility model, the second telescopic rope wheel assembly 9 further includes a fourth fixed seat 905.

[0104] The fourth fixed seat 905 is connected with the head end of the three-arm 3, and the third elongated rope 902 is connected with the fourth fixed seat 905. For example, the fourth fixed seat 905 is installed on the outer side wall of the head end of the three-arm 3.

[0105] In the embodiment, the fourth fixed seat 905 is installed on the outer side wall of the head end of the three-arm 3, so that a firm anchoring point is provided for the third elongated rope 902, the deviation or shaking of the rope body under stress is avoided, and the stable and reliable transmission process is ensured. In addition, the fourth fixed seat 905 can be installed in advance on the head end of the three-arm 3 as a prefabricated module, and the connection with the third elongated rope 902 does not need to disassemble other arm section components, and can meet the on-site rapid assembly demand.

[0106] Optionally, the end of the third elongated rope 902 is connected with a screw rod, the screw rod passes through the fourth fixed seat 905 and is connected with a nut. In the embodiment, the tension of the rope can be adjusted along the axial direction of the screw rod by rotating the nut. For example, when the nut is tightened, the screw rod pulls the rope to tighten, thereby increasing the pre-tightening force and avoiding the relaxation of the rope due to long-term use; when the nut is loosened, the tension can be released to adapt to the driving demand under different working conditions.

[0107] In some embodiments of the utility model, the second telescopic rope wheel assembly 9 further comprises a fifth fixed seat 906.

[0108] The fifth fixed seat 906 is arranged on the side of the five-arm 5 away from the connecting part 101 and is connected with the head end of the three-arm 3. For example, the fifth fixed seat 906 can be arranged between the three-arm 3 and the four-arm 4 and is connected with the inner side wall of the three-arm 3. The end of the third retractable rope 904 away from the five-arm 5 is arranged between the three-arm 3 and the four-arm 4 and is connected with the fifth fixed seat 906.

[0109] In the embodiment, the third retractable rope 904 starts from the tail end of the five-arm 5, passes through the third retractable wheel 903, enters between the three-arm 3 and the four-arm 4, and is fixed through the fifth fixed seat 906. The path is constrained on the inner side of the joint arm, the friction with the external structure is reduced, and the rope is prevented from being wound or deviated due to the relative movement of the joint arm during the extension and contraction.

[0110] Optionally, the end of the third retractable rope 904 is connected with a screw rod, the screw rod passes through the fifth fixed seat 906 and is connected with a nut. In the embodiment, the tension of the rope can be adjusted along the axial direction of the screw rod by rotating the nut. For example, when the nut is tightened, the screw rod pulls the rope to tighten, thereby increasing the pre-tightening force and avoiding the relaxation of the rope due to long-term use; when the nut is loosened, the tension can be released to adapt to the driving demand under different working conditions.

[0111] Reference Figure 2 As shown in the figure, in some embodiments of the utility model, the fourth fixed seat 905 comprises a connecting plate 9052 and two side plates 9051.

[0112] The two side plates 9051 are arranged on the three-arm 3 in a direction intersecting the axial direction of the three-arm 3. The connecting plate 9052 is connected between the two side plates 9051. The third elongated rope 902 is connected with the connecting plate 9052.

[0113] Further, the number of the second elongated wheels 801 is two, the two second elongated wheels 801 are coaxial and rotatably arranged between the two side plates 9051, and the two second elongated wheels 801 are arranged in a spaced manner in a direction intersecting the axial direction of the three-arm 3. The third elongated rope 902 passes through the space between the two second elongated wheels 801 and is connected with the connecting plate 9052.

[0114] The fifth fixing seat 906 is in one-to-one correspondence with the side plate 9051 and is connected with the side plate 9051.

[0115] In the embodiment, the two side plates 9051 are directly fixed on the three-armed 3, and are transversely connected through the connecting plate 9052, so that a closed frame structure is formed, and no additional support is needed. Meanwhile, the two coaxial second elongated wheels 801 are accommodated, the integration of the wheel set and the fixing seat is realized, and the axial space is reduced.

[0116] The utility model embodiment further provides a hoisting machinery.

[0117] Specifically, the hoisting machinery comprises a vehicle frame and the hoisting arm as described above.

[0118] The arm 1 of the hoisting arm is rotatably arranged on the vehicle frame.

[0119] It should be noted that the hoisting machinery comprises the hoisting arm, and therefore comprises all advantages of the hoisting arm, which will not be described again.

[0120] In some embodiments of the utility model, the hoisting machinery further comprises a support leg assembly 12 and a slewing assembly 13.

[0121] The support leg assembly 12 is telescopically arranged on the vehicle frame.

[0122] The slewing assembly 13 is rotatably arranged on the support leg assembly 12, the arm 1 is rotationally connected with the slewing assembly 13, and the lifting oil cylinder 10 is connected between the slewing assembly 13 and the arm 1.

[0123] In the embodiment, the support leg assembly 12 is telescopically arranged on the vehicle frame, supports the hoisting machinery when extended, and can be completely accommodated in the bottom or side of the vehicle frame when retracted, so that the whole vehicle maintains a compact external size when transported or moved.

[0124] The slewing assembly 13 is rotatably arranged on the support leg assembly 12, and comprises a slewing bearing, a driving motor and other components, and is used to drive the hoisting arm to rotate horizontally. The lifting oil cylinder 10 is used to control the pitch angle of the hoisting arm, so as to adapt to high-low lifting. The support leg assembly 12 is telescopically adjusted to support the vehicle body span, and the stability is enhanced.

[0125] The slewing assembly 13 is connected with the hoisting arm and the support leg assembly 12, transmits load, and allows relative rotation. The lifting oil cylinder 10 is hinged between the slewing assembly 13 and the arm 1, the thrust direction is automatically adjusted with slewing, and mechanism interference is avoided.

[0126] It is noted that the hoisting machinery includes, but is not limited to, truck cranes.

[0127] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A load arm, characterized in that The utility model relates to a telescopic arm mechanism, including: One arm (1), two arms (2), three arms (3), four arms (4) and five arms (5) are connected in turn and slide, the outer side wall of one arm (1) is equipped with the connecting part (101) for being connected with the lifting oil cylinder (10), Telescopic oil cylinder (11), the fixed end (1101) of telescopic oil cylinder (11) is connected with one arm (1), and the drive end (1102) of telescopic oil cylinder (11) is connected with two arms (2), First elongated rope wheel subassembly (6) is connected with drive end (1102), one arm (1) and three arms (3) respectively, and is used for driving three arms (3) to stretch out, First retraction rope wheel subassembly (7) is arranged on the side wall of two arms (2) away from the connecting part (101), and is connected with one arm (1) and three arms (3) respectively, and is used for driving three arms (3) to retract, First telescopic rope wheel subassembly (8) is arranged on the side wall of three arms (3) away from the connecting part (101), and is connected with two arms (2) and four arms (4) respectively, and is used for driving four arms (4) to stretch out and retract, Second telescopic rope wheel subassembly (9) is arranged on the side wall of four arms (4) away from the connecting part (101), and is connected with three arms (3) and five arms (5) respectively, and is used for driving five arms (5) to stretch out and retract.

2. A load arm according to claim 1, characterised in that The first elongated rope wheel subassembly (6) includes: First elongated wheel (601) is rotatably installed on the drive end (1102), First elongated rope (602) is wound on the first elongated wheel (601), and two ends are connected with the tail end of one arm (1) and the tail end of three arms (3) respectively.

3. A load arm according to claim 1, characterised in that The first retraction rope wheel subassembly (7) includes: First retraction wheel (701) is rotatably installed on the tail end of two arms (2) away from the connecting part (101) side wall, First retraction rope (702) is wound on the first retraction wheel (701), and two ends are connected with the tail end of three arms (3) and the head end of one arm (1) respectively.

4. A load arm according to claim 3, characterised in that The first retraction rope wheel subassembly (7) further includes first fixed seat (703), The first fixed seat (703) is arranged on the side of two arms (2) away from the connecting part (101), and is connected with the head end of one arm (1), and the end of first retraction rope (702) away from three arms (3) is arranged between one arm (1) and two arms (2), and is connected with first fixed seat (703).

5. A load arm according to claim 1, characterised in that The first telescopic rope wheel subassembly (8) includes: Second elongated wheel (801) is rotatably installed on the head end of three arms (3) away from the connecting part (101) side wall, Second elongated rope (802) is wound on the second elongated wheel (801), and two ends are connected with the tail end of four arms (4) and the head end of two arms (2) respectively, Second retraction wheel (803) is rotatably installed on the tail end of three arms (3) away from the connecting part (101) side wall, A second retraction rope (804) is wound around the second retraction wheel (803) and has two ends connected to the tail end of the four-arm (4) and the head end of the two-arm (2) respectively.

6. A load arm according to claim 5, characterised in that, The first telescopic rope wheel assembly (8) further comprises: A second fixed seat (805) is connected to the head end of the two-arm (2), and the second extension rope (802) is connected to the second fixed seat (805); And / or, a third fixed seat (806) is arranged on the side of the three-arm (3) away from the connecting part (101) and connected to the head end of the two-arm (2), and one end of the second retraction rope (804) away from the four-arm (4) is arranged between the two-arm (2) and the three-arm (3) and connected to the third fixed seat (806).

7. A load arm according to any one of claims 1 to 6, wherein, The second telescopic rope wheel assembly (9) comprises: A third extension wheel (901) is rotatably mounted on the side wall of the head end of the four-arm (4) away from the connecting part (101); A third extension rope (902) is wound around the third extension wheel (901) and has two ends connected to the tail end of the five-arm (5) and the head end of the three-arm (3) respectively; A third retraction wheel (903) is rotatably mounted on the side wall of the tail end of the four-arm (4) away from the connecting part (101); A third retraction rope (904) is wound around the third retraction wheel (903) and has two ends connected to the tail end of the five-arm (5) and the head end of the three-arm (3) respectively.

8. A load arm according to claim 7, characterised in that, The second telescopic rope wheel assembly (9) further comprises: A fourth fixed seat (905) is connected to the head end of the three-arm (3), and the third extension rope (902) is connected to the fourth fixed seat (905); And / or, a fifth fixed seat (906) is arranged on the side of the five-arm (5) away from the connecting part (101) and connected to the head end of the three-arm (3), and one end of the third retraction rope (904) away from the five-arm (5) is arranged between the three-arm (3) and the four-arm (4) and connected to the fifth fixed seat (906).

9. A hoisting machine characterized by It comprises: A vehicle frame; The lifting arm as claimed in any one of claims 1-8, wherein the one-arm (1) is rotatably arranged on the vehicle frame; A lifting oil cylinder (10), one end of which is rotatably connected to the vehicle frame, and the other end of which is rotatably connected to the connecting part (101) of the one-arm (1).

10. A hoisting machine according to claim 9, characterised in that The hoisting machinery further comprises: A support leg assembly (12) telescopically arranged on the vehicle frame; A slewing assembly (13) rotatably arranged on the support leg assembly (12), and the one-arm (1) is rotatably connected to the slewing assembly (13), and the lifting oil cylinder (10) is connected between the slewing assembly (13) and the one-arm (1).

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