Folding tower crane supporting arm locking mechanism

Abstract

The utility model discloses a folding tower crane supporting arm locking mechanism which is characterized in that a connecting rod mechanism is arranged on one side of an upper arm and one side of a lower arm, three first square pipes are arranged on the other side of the upper arm and the other side of the lower arm, square rods are inserted into the three first square pipes located on the upper side, and a push plate is jointly arranged on the tops of the three square rods; an electric push rod is mounted on the outer surface of the upper arm; the telescopic end of the electric push rod is connected with the upper surface of the push plate; second square pipes are transversely installed on the inner walls of the two sides of the upper arm and the inner walls of the two sides of the lower arm correspondingly, a U-shaped rod is installed in the upper arm through a moving mechanism, and transmission mechanisms capable of being in transmission fit with the moving mechanism when the electric push rods are started are arranged on the surfaces of the three first square pipes located on the upper side. Auxiliary locking mechanisms are provided for the outer sides and the other two sides of the upper arm and the lower arm so as to cope with the influence of wind power in different directions on the folding tower crane in the using process, and the load sharing capacity of the connecting rod is further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of tower crane equipment, in particular to a foldable tower crane support arm locking mechanism. Background Art

[0002] A foldable tower crane is a tower crane with a foldable main arm for easy transportation and storage. It is usually used at construction sites to lift and move heavy construction materials and equipment. It is usually installed on a fixed foundation on or near the top of a building and is able to operate within a large working radius, providing efficient lifting capacity and flexibility. Foldable tower cranes are widely used in the construction industry, especially in high-rise buildings and large engineering projects.

[0003] The Chinese patent with publication number CN220449640U discloses a folding tower crane support arm locking mechanism, which drives the rotating shaft to rotate through a remote control motor, rotates the two cams to the inside, holds the bottom of the lower boss, and forms an auxiliary locking mechanism on the front side of the support arm. In this way, during the use of the tower crane, part of the load of the two connecting rods can be shared, thereby extending the service life of the connecting rod mechanism.

[0004] In the above patent, the load is shared by the cam holding the bottom of the lower boss, and the main stress point is at the connection between the rotating shaft and the cam. Through the lever principle, when the cam is subjected to the force, the connection between the rotating shaft and the cam will be subjected to more force, which may easily lead to the breakage of the connection, and the structural stability is poor.

[0005] Moreover, the above patent can only share the load for the connecting rod in one direction, while the folding tower crane is subjected to wind forces in different directions during use. A single direction cannot share the load for the connecting rod well, and the use effect is poor. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a foldable tower crane support arm locking mechanism.

[0007] The utility model provides the following technical solutions: a foldable tower crane support arm locking mechanism, including an upper arm and a lower arm, a connecting rod mechanism is provided on one side of the upper arm and the lower arm, three first square tubes are installed on the other side of the upper arm and the lower arm, square rods are inserted into the interior of the three first square tubes on the upper side, a push plate is installed on the top of the three square rods, an electric push rod is installed on the outer surface of the upper arm, and the end of the telescopic end of the electric push rod is connected to the upper surface of the push plate. Second square tubes are installed horizontally on the inner walls of both sides of the upper arm and the lower arm, a U-shaped rod is installed inside the upper arm through a moving mechanism, and a transmission mechanism that can cooperate with the moving mechanism when the electric push rod is started is provided on the surface of the three first square tubes on the upper side.

[0008] Preferably, the moving mechanism comprises a threaded rod rotatably connected to the upper arm, a nut is mounted on the outer surface of the threaded rod, a connecting rod is mounted on the outer surface of the nut, and the bottom of the connecting rod is connected to the U-shaped rod.

[0009] Preferably, the transmission mechanism includes a toothed plate vertically arranged on the outer surface of the middle square rod, a notch is opened on the surface of the first square tube on the upper side and located in the middle, a transmission gear is arranged inside the notch, and the transmission gear is meshingly connected with the toothed plate, the outer surfaces on both sides of the transmission gear are connected with connecting shafts, the outer surfaces of the first square tubes on the upper side and located on both sides are installed with protrusions, and the end of the connecting shaft passes through the other side of the protrusion and is rotatably connected thereto, a first bevel gear is installed on the end of the connecting shaft, one end of the threaded rod passes through the outer side of the upper arm and is installed with a second bevel gear, and the second bevel gear is meshingly connected with the first bevel gear.

[0010] Preferably, both sides of the inner wall of the upper arm are provided with sliding grooves, a sliding block is provided inside the sliding groove, and the end of the sliding block is connected to the nut.

[0011] Preferably, fixing blocks are installed on both sides of the inner wall of the upper arm, and the other end of the threaded rod is rotatably connected to the fixing block.

[0012] Preferably, a groove is formed on the outer surface of the upper and middle square rod, and the tooth plate is arranged in the groove.

[0013] Compared with the existing technology, the beneficial effects of the utility model are:

[0014] (1) The utility model drives the push plate to move by the electric push rod, which can drive the three square rods to slide downward, and make the square rods be in the first square tubes on the upper and lower sides at the same time, so as to form an auxiliary locking mechanism on the outer sides of the upper arm and the lower arm, share the load for the connecting rod, and extend the service life of the connecting rod mechanism. The square rod bears all the loads, and it is an integrated structure, so the bearing capacity is stronger and the structure is more stable. In addition, through the transmission effect of the moving mechanism and the transmission mechanism, the U-shaped rod can be driven to move and inserted into the two second square tubes at the same time as the electric push rod is started, so that an auxiliary locking mechanism can be provided from the other two sides to cope with the influence of wind forces in different directions during the use of the folding tower crane, further enhance the ability of the connecting rod to share the load, and achieve good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the upper arm and the lower arm of the utility model;

[0017] Figure 3 for Figure 1 A is an enlarged schematic diagram;

[0018] Figure 4 for Figure 2 A magnified schematic diagram of B. DETAILED DESCRIPTION

[0019] like Figures 1 to 4 As shown, a foldable tower crane support arm locking mechanism includes an upper arm 1, a lower arm 2, a connecting rod mechanism 3, a first square tube 4, a square rod 5, a push plate 6, an electric push rod 7, a second square tube 8, a U-shaped rod 9, a moving mechanism 10, a threaded rod 11, a nut 12, a connecting rod 13, a transmission mechanism 14, a tooth plate 15, a notch 16, a transmission gear 17, a connecting shaft 18, a protrusion 19, a first bevel gear 20, a second bevel gear 21, a slide groove 22, a slider 23, a fixing block 24 and a groove 25.

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figures 1 to 4As shown, a connecting rod mechanism 3 is provided on one side of the upper arm 1 and the lower arm 2, and three first square tubes 4 are installed on the other side of the upper arm 1 and the lower arm 2. Square rods 5 are inserted inside the three first square tubes 4 on the upper side, and a push plate 6 is installed on the top of the three square rods 5. An electric push rod 7 is installed on the outer surface of the upper arm 1, and the end of the telescopic end of the electric push rod 7 is connected to the upper surface of the push plate 6. When the upper arm 1 and the lower arm 2 are closed through the connecting rod mechanism 3, the electric push rod 7 can be started to drive the three square rods 5 to move downward at the same time, and the square rods 5 are simultaneously in the first square tubes 4 on the upper and lower sides, so as to form an auxiliary locking mechanism on the outer side of the upper arm 1 and the lower arm 2, and share the load for the connecting rod. Second square tubes 8 are installed horizontally on the inner walls of both sides of the upper arm 1 and the lower arm 2, and a U-shaped rod 9 is installed inside the upper arm 1 through a moving mechanism 10. The moving mechanism 10 can drive the U-shaped rod 9 to move and insert it into the two second square tubes 8, providing an auxiliary locking mechanism from the other two sides. The surfaces of the three first square tubes 4 located on the upper side are provided with a transmission mechanism 14 which can cooperate with the moving mechanism 10 when the electric push rod 7 is started. When the electric push rod 7 is started to drive the square rod 5 to move downward, the transmission mechanism 14 can play a transmission role, provide power for the moving mechanism 10, and then drive the U-shaped rod 9 to move.

[0024] The moving mechanism 10 includes a threaded rod 11 rotatably connected to the upper arm 1, a nut 12 is installed on the outer surface of the threaded rod 11, a connecting rod 13 is installed on the outer surface of the nut 12, and the bottom of the connecting rod 13 is connected to the U-shaped rod 9. When the threaded rod 11 is rotated, the nut 12 can be driven to slide along its surface, and through the connection of the connecting rod 13, the U-shaped rod 9 is driven to move and its two ends are respectively inserted into the two second square tubes 8, forming an auxiliary locking mechanism, sharing the load for the connecting rod, and extending the service life of the connecting rod mechanism 3. Slide grooves 22 are provided on both sides of the inner wall of the upper arm 1, and a slider 23 is provided inside the slide groove 22. The end of the slider 23 is connected to the nut 12. Through the setting of the slide groove 22 and the slider 23, the nut 12 can be provided with a limiting guiding capability, so that the nut 12 drives the U-shaped rod 9 to move along a fixed track and accurately insert into the two second square tubes 8. Fixed blocks 24 are installed on both sides of the inner wall of the upper arm 1, and the other end of the threaded rod 11 is rotatably connected to the fixed block 24. Through the setting of the fixed block 24, a force point can be provided for the end of the threaded rod 11, making its structure more stable and reliable.

[0025] The transmission mechanism 14 includes a toothed plate 15 vertically arranged on the outer surface of the middle square rod 5, a notch 16 is opened on the surface of the first square tube 4 located in the middle on the upper side, a transmission gear 17 is arranged inside the notch 16, and the transmission gear 17 is meshed and connected with the toothed plate 15, and the outer surfaces of both sides of the transmission gear 17 are connected with connecting shafts 18, and the outer surfaces of the first square tubes 4 located on the upper side and on both sides are installed with protrusions 19, and the end of the connecting shaft 18 passes through the other side of the protrusion 19 and is rotatably connected thereto, and the end of the connecting shaft 18 is installed with a first bevel gear 20, and one end of the threaded rod 11 passes through The second bevel gear 21 is installed on the outer side of the upper arm 1, and the second bevel gear 21 is meshed and connected with the first bevel gear 20. When the upper arm 1 and the lower arm 2 are closed, the electric push rod 7 is started to drive the push plate 6 to move, and the square rod 5 is driven to move downward. Through the meshing relationship between the tooth plate 15 and the transmission gear 17, the transmission gear 17 can be driven to rotate, and the first bevel gear 20 is driven to rotate through the connection of the connecting shaft 18. Through the meshing relationship between the first bevel gear 20 and the second bevel gear 21, the threaded rod 11 can be driven to rotate, and the two ends of the U-shaped rod 9 are respectively inserted into the two second square tubes 8. A groove 25 is opened on the outer surface of the upper side and located in the middle of the square rod 5, and the tooth plate 15 is arranged in the groove 25. By installing the tooth plate 15 in the groove 25, the toothed part of the tooth plate 15 will not contact the inner wall of the first square tube 4 and generate friction.

[0026] The working principle of the utility model is as follows: when in use, the upper arm 1 and the lower arm 2 are first closed by the connecting rod mechanism 3, and then the electric push rod 7 is started, and the telescopic end of the electric push rod 7 drives the push plate 6 to move downward, and pushes the three square rods 5 to move downward until the square rod 5 is simultaneously in the first square tube 4 on the upper and lower sides, thereby forming an auxiliary locking mechanism on the outer side of the upper arm 1 and the lower arm 2 to share the load for the connecting rod, and in the process of the square rod 5 moving downward, the meshing relationship between the tooth plate 15 and the transmission gear 17 can drive the transmission gear 17 to rotate, and the first bevel gear 20 is driven to rotate through the connection effect of the connecting shaft 18, and the threaded rod 11 is driven to rotate through the meshing relationship between the first bevel gear 20 and the second bevel gear 21, so that the nut 12 slides along its surface, and through the connection effect of the connecting rod 13, the U-shaped rod 9 is driven to move and its two ends are respectively inserted into the two second square tubes 8, thereby providing an auxiliary locking mechanism from the other two sides to cope with the influence of wind forces in different directions on the folding tower crane during use, further enhancing the ability of the connecting rod to share the load, and having a good use effect.

[0027] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A foldable tower crane support arm locking mechanism, comprising an upper arm (1) and a lower arm (2), wherein a connecting rod mechanism (3) is provided on one side of the upper arm (1) and the lower arm (2), and characterized in that: Three first square tubes (4) are installed on the other side of the upper arm (1) and the lower arm (2), and square rods (5) are inserted into the interior of the three first square tubes (4) on the upper side, and a push plate (6) is installed on the top of the three square rods (5). An electric push rod (7) is installed on the outer surface of the upper arm (1), and the end of the telescopic end of the electric push rod (7) is connected to the upper surface of the push plate (6); second square tubes (8) are installed transversely on the inner walls of both sides of the upper arm (1) and the lower arm (2), and a U-shaped rod (9) is installed inside the upper arm (1) through a moving mechanism (10), and a transmission mechanism (14) that can cooperate with the moving mechanism (10) when the electric push rod (7) is started is provided on the surface of the three first square tubes (4) on the upper side.

2. A foldable tower crane support arm locking mechanism according to claim 1, characterized in that: The moving mechanism (10) comprises a threaded rod (11) rotatably connected to the upper arm (1), a nut (12) being mounted on the outer surface of the threaded rod (11), a connecting rod (13) being mounted on the outer surface of the nut (12), and the bottom of the connecting rod (13) being connected to the U-shaped rod (9).

3. A foldable tower crane support arm locking mechanism according to claim 2, characterized in that: The transmission mechanism (14) comprises a toothed plate (15) vertically arranged on the outer surface of the square rod (5) located in the middle, a notch (16) is opened on the surface of the first square tube (4) located in the middle on the upper side, a transmission gear (17) is arranged inside the notch (16), and the transmission gear (17) is meshingly connected with the toothed plate (15), the outer surfaces of both sides of the transmission gear (17) are connected with connecting shafts (18), the outer surfaces of the first square tubes (4) located on the upper side and on both sides are installed with protrusions (19), and the end of the connecting shaft (18) passes through the other side of the protrusion (19) and is rotatably connected thereto, and the end of the connecting shaft (18) is installed with a first bevel gear (20), one end of the threaded rod (11) passes through the outer side of the upper arm (1) and is installed with a second bevel gear (21), and the second bevel gear (21) is meshingly connected with the first bevel gear (20).

4. A foldable tower crane support arm locking mechanism according to claim 3, characterized in that: Slide grooves (22) are provided on both sides of the inner wall of the upper arm (1), a slider (23) is provided inside the slide groove (22), and the end of the slider (23) is connected to the nut (12).

5. A foldable tower crane support arm locking mechanism according to claim 4, characterized in that: Fixed blocks (24) are installed on both sides of the inner wall of the upper arm (1), and the other end of the threaded rod (11) is rotatably connected to the fixed block (24).

6. A foldable tower crane support arm locking mechanism according to claim 5, characterized in that: A groove (25) is provided on the outer surface of the square rod (5) located at the upper side and in the middle, and the tooth plate (15) is arranged in the groove (25).

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