Arm and tower connecting system of tower crane and tower crane

Abstract

The application relates to a tower crane, and discloses a boom and tower body connecting system of a tower crane and the tower crane. The boom and tower body connecting system of the tower crane comprises a tower body and a boom. The top of the tower body is provided with a mounting seat. The mounting seat comprises a balance arm side main beam and a hoisting arm side main beam. The balance arm side main beam is hinged with a balance arm side mounting hole of the boom. The hoisting arm side main beam is hinged with a hoisting arm side mounting hole of the boom through a hoisting arm side pin shaft to form quick-release type hinging. In the working process, the hinging between the hoisting arm side main beam and the hoisting arm side mounting hole of the boom can be realized or released. The special working condition that the boom is inclined to the balance arm side to drop the balance weight to balance the bending moment can be applied. The impact of sudden unloading on the tower crane structure is reduced, and the safety performance of the tower crane is increased.

Description

Technical Field

[0001] This invention relates to tower cranes, and more specifically, to a jib-to-tower connection system for a tower crane. Furthermore, it also relates to a tower crane. Background Technology

[0002] Tower cranes, also known as tower hoists, are rotating cranes with their jibs mounted on the upper part of a tall tower. They offer a large working space and are mainly used for the vertical and horizontal transport of materials and the installation of building components in construction. Based on the rotation method, they are divided into top-slewing tower cranes and bottom-slewing tower cranes.

[0003] Existing tower cranes have their jib mounted on the tower body, which is divided into a counterweight jib and a lifting jib. The counterweight jib is located behind the lifting jib. The counterweight jib and the tower body are connected by pins, so that the tower crane is always in the installation state during operation. The relative position of the jib and the tower body is fixed. The counterweight is usually installed at the tail end of the counterweight jib.

[0004] However, during hoisting operations, tower cranes may encounter sudden unloading situations, such as the hoisting rope suddenly breaking and causing the hoisted load to fall. In this case, the tower body will bear a large backward bending moment, and the jib will generate a reverse impact. This impact will be transmitted to the tower body, causing the tower crane to suffer a large impact bending moment, making the tower crane prone to overturning and affecting production safety.

[0005] Therefore, when a tower crane suddenly unloads, it is desirable for the boom to tilt towards the counterweight side to trigger the counterweight at the tail end of the counterweight to fall off. However, the boom and tower body of existing tower cranes are in fixed positions, which cannot meet this design requirement. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a jib-to-tower connection system for a tower crane. This jib-to-tower connection system is applicable to special working conditions where the jib tilts towards the counterweight to release the counterweight in order to balance the bending moment, thereby reducing the impact of sudden unloading on the tower crane structure and increasing the safety performance of the tower crane.

[0007] The technical problem that this invention also aims to solve is to provide a tower crane whose boom-to-tower connection system is adaptable to special working conditions where the boom tilts towards the counterweight to release the counterweight in order to balance the bending moment, thereby reducing the impact of sudden unloading on the tower crane structure and increasing the safety performance of the tower crane.

[0008] To address the aforementioned technical problems, the present invention provides a tower crane boom-to-tower connection system, comprising a tower body and a boom. A mounting base is provided at the top of the tower body. The mounting base includes a counterweight boom side main beam and a jib side main beam. The counterweight boom side main beam is hinged to a counterweight boom side mounting hole of the boom. A quick-release hinge is formed between the jib side main beam and the jib side mounting hole of the boom through a jib side pin, enabling or disengaging the hinge between the jib side main beam and the jib side mounting hole of the boom during operation.

[0009] Optionally, the main beam on the counterweight boom side is provided with a first connecting lug plate that is hinged to the counterweight boom side mounting hole of the boom, and the main beam on the boom side is provided with a second connecting lug plate. The second connecting lug plate and the boom side mounting hole of the boom are connected by a boom side pin to form a quick-release hinge.

[0010] Optionally, the boom side pin is connected to a drive mechanism for driving the boom side pin to move along its axial direction.

[0011] Furthermore, the drive mechanism is a telescopic drive mechanism, which includes a piston rod and a cylinder. The piston rod is fixedly connected to the main beam on the side of the boom, and the cylinder is fixedly connected to the pin on the side of the boom.

[0012] Furthermore, a fixing plate for fixing the piston rod is provided on the main beam on the side of the lifting boom.

[0013] Specifically, a pin guide rail for supporting the lifting boom side pin is installed between the fixing plate and the second connecting ear plate.

[0014] Specifically, the telescopic drive mechanism is a hydraulic cylinder, which is connected to a hydraulic pump via an oil pipe; or, the telescopic drive mechanism is an air cylinder, which is connected to an air pump via an air pipe.

[0015] More specifically, the cylinder is located inside the side pin of the boom, and a flange is installed at the port of the cylinder. The piston rod passes through the flange and connects to the piston inside the cylinder.

[0016] Furthermore, the cylinder and the side pin of the lifting arm are integrally formed.

[0017] Specifically, a position detection device is provided on the side pin of the boom, and a limit switch is installed at the mounting hole on the side of the boom of the boom.

[0018] Optionally, a pressure-bearing pad is provided in the middle of the second connecting ear plate.

[0019] Optionally, the first connecting ear plate has a U-shaped groove in the middle.

[0020] Another aspect of the present invention provides a tower crane, which is provided with a boom-to-tower connection system of the tower crane described in any of the above technical solutions.

[0021] The beneficial effects of the present invention through the above technical solution are as follows:

[0022] This invention designs the boom-side pin as a quick-release hinge structure. By using this pin, the boom-side main beam can be connected to the boom-side mounting hole of the boom frame via the pin, or the connection can be released. Thus, in special operating conditions where the tower crane may suddenly unload and require the boom to tilt towards the counterweight to balance the bending moment, controlling the boom-side pin to release the connection between the boom-side main beam and the boom-side mounting hole reduces the impact of sudden unloading on the tower crane structure and increases its safety performance. Under normal operating conditions, the boom-side main beam is connected to the boom-side mounting hole of the boom frame via the pin.

[0023] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a structural schematic diagram of the boom-to-tower connection system of a tower crane according to a specific embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the drive mechanism in a specific embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the mounting base in a specific embodiment of the present invention;

[0028] Figure 4 This is a cross-sectional view of the driving mechanism in a specific embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures

[0030] 1 Mounting base 11 Counterweight arm Side main beam

[0031] 12. Crane boom side main beam; 13. First connecting lug plate

[0032] 14 Second connecting lug plate 15 Crane boom side pin

[0033] 16 Pressure bearing plate 17 Fixing plate

[0034] 18 Pin Shaft Guide Rail 19 U-Slot

[0035] 2 booms, 21 piston rods

[0036] 22 Flange 23 Hydraulic Pump

[0037] 24 flange 25 nut

[0038] 26 Position detection device 27 Limit switch Detailed Implementation

[0039] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention, and the scope of protection of the present invention is not limited to the specific embodiments described below.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] Furthermore, the terms “first,” “second,” etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with “first,” “second,” etc., may explicitly or implicitly include one or more of the stated features.

[0042] In the description of this invention, it should be understood that the directional terms are based on the orientation of the tower crane in its operating state. For ease of description and simplification, the terms "front" and "rear" refer to the forward and backward direction of the tower crane in its operating state, and the terms "up" and "down" refer to the vertical direction of the tower crane itself. For example, referring to... Figure 1 The boom 2 is located above the mounting base 1 on the tower body, and the counterweight boom is located behind the lifting boom. The orientation or positional relationship shown in the attached drawings is only for the convenience of describing the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0043] like Figures 1 to 3As shown, the present invention provides a jib and tower body connection system for a tower crane, including a tower body and a jib 2. The jib 2 is divided into a lifting jib and a counterweight jib by the tower body. The lifting jib is located at the front end of the counterweight jib. A mounting base 1 is provided at the top of the tower body. The mounting base 1 includes a counterweight jib side main beam 11 and a lifting jib side main beam 12. The counterweight jib side main beam 11 is hinged to the counterweight jib side mounting hole (not shown in the figure) of the jib by a pin. The lifting jib side main beam 12 and the lifting jib side mounting hole (not shown in the figure) of the jib side form a quick-release hinge by a lifting jib side pin 15. During the operation of the tower crane, the hinge between the lifting jib side main beam 12 and the lifting jib side mounting hole of the jib can be realized or released.

[0044] Furthermore, a first connecting lug 13 is provided on the counterweight boom side main beam 11, and the first connecting lug 13 is hinged to the counterweight boom side mounting hole of the boom through a pin. A second connecting lug 14 is provided on the boom side main beam 12, and the second connecting lug 14 and the boom side mounting hole of the boom are connected by a boom side pin 15 to form a quick-release hinge.

[0045] In the above technical solution, the "quick-release hinge" means that the boom-side pin 15 can pass through the through hole of the second connecting ear plate 14 and the boom-side mounting hole of the boom, so as to form a hinge connection between the second connecting ear plate and the boom of the boom. Alternatively, the boom-side pin 15 can be removed from the through hole of the second connecting ear plate 14 and the boom-side mounting hole of the boom, thereby releasing the hinge connection between the second connecting ear plate and the boom of the boom. Therefore, in actual operation, a threshold can be set. When the lifting moment reaches the threshold, it is considered that a special working condition may occur where the tower crane suddenly unloads, requiring the boom to tilt towards the counterweight to dislodge and balance the bending moment. At this time, the boom side pin 15 can be removed from the through hole of the second connecting ear plate 14 and the boom side mounting hole of the boom, thus releasing the hinge connection between the second connecting ear plate and the boom of the boom. This allows the boom to rise around the pin between the first connecting ear plate 13 and the counterweight of the boom in the event of sudden unloading of the tower crane. By tilting the boom towards the counterweight, the counterweight located at the tail of the counterweight can be triggered to dislodge, thereby balancing the bending moment, reducing the impact of sudden unloading on the tower crane structure, and increasing the safety performance of the tower crane.

[0046] In specific embodiments of the present invention, such as Figure 3 As shown, the second connecting lug 14 is composed of two lugs arranged side by side, and a pressure-bearing pad 16 can be set in the middle of the second connecting lug 14, such as... Figure 1As shown, when the boom is mounted on the mounting base 1, when the boom side is under pressure, the bottom of the boom side structure directly presses against the pressure-bearing pad 16. Therefore, no pressure is directly applied to the boom side pin 15, thus preventing the boom side pin 15 from passing through the through hole of the second connecting ear plate 14 and the boom side mounting hole of the boom, or from being removed from the through hole of the second connecting ear plate 14 and the boom side mounting hole of the boom. The pressure-bearing pad 16 ensures that the boom side pin 15 is not stressed when the boom side is under pressure, and removing the boom side pin 15 does not affect the normal operation of the tower crane.

[0047] Generally, a drive mechanism can be provided to drive the boom-side pin 15 to pass through or disengage from the through hole of the second connecting lug 14 and the boom-side mounting hole of the boom. For example... Figure 1 and Figure 3 As shown, the drive mechanism is a telescopic drive mechanism, which includes a piston rod 21 and a cylinder. The piston rod 21 is fixedly connected to the main beam 12 on the side of the boom, and the cylinder is fixedly connected to the boom-side pin 15. The piston rod 21 and the cylinder move relative to each other. When the cylinder moves towards the piston rod 21, the boom-side pin 15 disengages from the through hole of the second connecting ear plate 14 and the boom-side mounting hole of the boom. When the cylinder moves away from the piston rod 21, the boom-side pin 15 extends into the through hole of the second connecting ear plate 14 and the boom-side mounting hole of the boom, so that the boom-side pin 15 moves along its axial direction.

[0048] In a specific embodiment of the present invention, the cylinder is located inside the boom-side pin 15 and is fixedly connected to the boom-side pin 15. A flange 24 is installed at the port of the cylinder, and the piston rod 21 passes through the flange 24 and connects to the piston inside the cylinder. A sealing ring is generally required between the flange 24 and the port of the cylinder to achieve a seal on the cylinder.

[0049] Furthermore, such as Figure 4As shown, the cylinder and the boom-side pin 15 are integrally formed, meaning that the space inside the boom-side pin 15 forms the cylinder for piston movement. The piston rod 21 passes through the flange 24 and connects to the piston inside the boom-side pin 15, thereby directly driving the boom-side pin 15 to extend into or disengage from the through hole of the second connecting ear plate 14 and the boom-side mounting hole of the boom. For simplicity, a hydraulic cylinder is used as an example for the drive mechanism. The piston divides the internal space of the boom-side pin 15 into a rod chamber and a rodless chamber. The rod chamber and the rodless chamber are connected to the hydraulic pump through oil pipes, respectively. An electromagnetic reversing valve is installed on the oil pipe to control the opening and closing of the oil pipe. At the same time, a position detection device 26, such as a displacement sensor, is installed inside the boom-side pin 15, and a limit switch 27 is installed at the boom-side mounting hole of the boom. By feeding back the displacement information of the boom side pin 15 through the position detection device, the movement status of the boom side pin 15 can be monitored in real time. Simultaneously, faults can be detected promptly, such as the piston rod 21 being stuck within the boom side pin 15, enabling intelligent stroke control. A displacement switch can detect whether the boom side pin 15 has moved to a designated position. If it detects this, a signal is sent to the controller, which then controls the on / off state of the solenoid directional valve, thereby achieving intelligent control of the boom side pin 15. Furthermore, by using the boom side pin 15 instead of the cylinder, space occupancy is reduced, operational stability is increased, and the piston rod and boom side pin 15 are kept on the same central axis, allowing for intelligent control of the boom side pin 15's movement.

[0050] Furthermore, the drive mechanism can be a hydraulic drive mechanism, specifically, such as... Figure 2 As shown, a hydraulic cylinder can be used. The piston rod 21 and the cylinder barrel are the components of the hydraulic cylinder. The hydraulic cylinder also includes a piston. One end of the piston rod 21 extends into the cylinder barrel and is connected to the piston. The piston divides the cylinder barrel into a rod chamber and a rodless chamber. The rod chamber and the rodless chamber are respectively connected to the hydraulic pump 23 through oil pipe 22, thereby realizing the relative movement between the piston rod 21 and the cylinder barrel.

[0051] Alternatively, the driving mechanism can be a pneumatic driving mechanism, specifically a cylinder. The piston rod 21 and the cylinder barrel form the structure of the cylinder. The cylinder also includes a piston. One end of the piston rod 21 extends into the cylinder barrel and connects to the piston. The piston divides the cylinder barrel into a rod chamber and a rodless chamber. The rod chamber and the rodless chamber are respectively connected to the pneumatic pump through air pipes, thereby realizing the relative movement between the piston rod 21 and the cylinder barrel.

[0052] Alternatively, the drive mechanism can also be an electric drive mechanism, specifically a linear motor, which can be used to realize the relative movement between the piston rod 21 and the cylinder.

[0053] In specific embodiments of the present invention, such as Figure 1 and Figure 2 A fixing plate 17 can be installed on the main beam 12 on the side of the lifting boom. The fixing plate 17 has an opening. The end of the piston rod 21 passes through the opening on the fixing plate 17, and the end of the piston rod 21 is fixedly connected to the fixing plate 17 with a nut 25, so that the piston rod 21 is fixed and the cylinder moves relative to the piston rod 21.

[0054] Furthermore, a pin guide rail 18 can be installed between the fixed plate 17 and the second connecting ear plate 14. The cross-sectional shape of the pin guide rail 18 is adapted to the cross-sectional shape of the boom-side pin 15, and is generally semi-circular. During the movement of the boom-side pin 15, the pin guide rail 18 can support the boom-side pin 15.

[0055] In specific embodiments of the present invention, such as Figure 3 As shown, the first connecting ear plate 13 is composed of two ear plates arranged side by side. A U-shaped groove 19 can be provided in the middle of the first connecting ear plate 13. When the boom is installed on the mounting base 1, when the balance arm side is under pressure, the bottom of the structure of the balance arm side of the boom directly presses on the U-shaped groove 19, increasing the number of shear surfaces between the balance arm side and the first connecting ear plate 13, thereby reducing the pin specification. A relatively smaller pin can be used, while meeting the requirement that the boom can rotate around the pin on the balance arm side.

[0056] To better understand the technical concept of this invention, a relatively comprehensive description is provided below.

[0057] like Figures 1 to 3As shown, the preferred embodiment of the tower crane's boom-to-tower connection system includes a tower body and a boom 2. The boom 2 is divided into a lifting boom and a counterweight boom by the tower body. The lifting boom is located at the front end of the counterweight boom. A mounting base 1 is provided at the top of the tower body. The mounting base 1 includes a counterweight boom side main beam 11 and a lifting boom side main beam 12. First connecting lugs 13 are symmetrically arranged on both sides of the counterweight boom side main beam 11. The first connecting lugs 13 are hinged to the counterweight boom side mounting holes of the boom via pins. Second connecting lugs 14 are symmetrically arranged on both sides of the lifting boom side main beam 12. The second connecting lugs 14 are hinged to the lifting boom side mounting holes of the boom via lifting boom side pins 15. The lifting boom side pins 15 are connected to the drive... The driving mechanism includes a piston rod 21 and a cylinder. The piston rod 21 is fixedly connected to the main beam 12 on the side of the boom via a fixing plate 17. A pin guide rail 18 is installed between the fixing plate 17 and the second connecting ear plate 14, which supports the boom-side pin 15. A flange 24 is installed at the port of the cylinder, and the piston rod 21 passes through the flange 24 to connect with the piston inside the cylinder. A sealing ring is generally installed between the flange 24 and the port of the cylinder to seal the cylinder. The piston divides the cylinder into a rod chamber and a rodless chamber, which are connected to a hydraulic pump 23 via oil pipes 22, thereby controlling the relative movement between the piston rod 21 and the cylinder. The drive control of the boom-side pin 15 is not limited to hydraulic drive; other drive methods such as electromagnetic drive or cylinder drive can also be used.

[0058] In actual operation, a threshold can be set. When the lifting moment reaches the threshold, it is considered that the tower crane is prone to sudden unloading, requiring the boom to tilt towards the counterweight side. When the lifting moment reaches the threshold, the counterweight will fall off to balance the bending moment. In this special working condition, the boom side pin 15 can be removed from the through hole of the second connecting ear plate 14 and the boom side mounting hole of the boom through the drive mechanism, and the hinge connection between the second connecting ear plate and the boom of the boom can be released. In the case of sudden unloading of the tower crane, the boom can be raised around the pin between the first connecting ear plate 13 and the counterweight of the boom. By tilting the boom towards the counterweight side, the counterweight located at the tail of the counterweight can be triggered to fall off to balance the bending moment, reduce the impact of sudden unloading on the tower crane structure, and increase the safety performance of the tower crane. To accommodate the special working conditions where tower cranes need to tilt the boom towards the counterweight to release the counterweight and balance the bending moment due to sudden unloading, the insertion and removal of the boom side pin 15 does not affect the normal use of the tower crane. At the same time, when the lifting moment does not reach the above-mentioned threshold, it is not necessary to remove the boom side pin 15 from the through hole of the second connecting ear plate 14 and the boom side mounting hole of the boom, so as not to affect the use of the tower crane under normal working conditions.

[0059] Furthermore, the present invention also provides a tower crane that employs the aforementioned tower crane boom-to-tower connection system, thus possessing the technical effects of various embodiments of the tower crane boom-to-tower connection system of the present invention.

[0060] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0061] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0062] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A boom-to-tower connection system for a tower crane, comprising a tower and a boom (2), characterized in that, The top of the tower body is provided with a mounting base (1), which includes a counterweight boom side main beam (11) and a lifting boom side main beam (12). The counterweight boom side main beam (11) is hinged to the counterweight boom side mounting hole of the boom (2), and the lifting boom side main beam (12) and the lifting boom side mounting hole of the boom (2) are connected by a lifting boom side pin (15) to form a quick-release hinge, so that the hinge between the lifting boom side main beam (12) and the lifting boom side mounting hole of the boom (2) can be realized or released during operation; when the lifting torque reaches a threshold, the lifting boom side pin (15) is controlled. ) Disconnect the main beam (12) of the boom side from the boom side mounting hole of the boom (2); the main beam (11) of the counterweight boom side is provided with a first connecting lug (13) that is hinged to the counterweight boom side mounting hole of the boom, the main beam (12) of the boom side is provided with a second connecting lug (14), the second connecting lug (14) and the boom side mounting hole of the boom are connected by a boom side pin (15) to form a quick-release hinge; the boom side pin (15) is provided with a position detection device (26), and the boom side mounting hole of the boom is provided with a limit switch (27).

2. The boom-to-tower connection system of the tower crane according to claim 1, characterized in that, The boom side pin (15) is connected to a drive mechanism for driving the boom side pin (15) to move along its axial direction.

3. The boom-to-tower connection system of the tower crane according to claim 2, characterized in that, The drive mechanism is a telescopic drive mechanism, which includes a piston rod (21) and a cylinder. The piston rod (21) is fixedly connected to the main beam (12) on the side of the boom, and the cylinder is fixedly connected to the pin (15) on the side of the boom.

4. The boom-to-tower connection system of the tower crane according to claim 3, characterized in that, A fixing plate (17) for fixing the piston rod (21) is provided on the main beam (12) on the side of the crane boom.

5. The boom-to-tower connection system of a tower crane according to claim 4, characterized in that, A pin guide rail (18) for supporting the boom side pin (15) is installed between the fixing plate (17) and the second connecting ear plate (14).

6. The boom-to-tower connection system of a tower crane according to claim 3, characterized in that, The telescopic drive mechanism is a hydraulic cylinder, which is connected to a hydraulic pump (23) via an oil pipe (22); or, the telescopic drive mechanism is an air cylinder, which is connected to an air pump via an air pipe.

7. The boom-to-tower connection system of a tower crane according to claim 6, characterized in that, The cylinder is located inside the side pin (15) of the boom, and a flange (24) is installed at the port of the cylinder. The piston rod (21) passes through the flange (24) and is connected to the piston inside the cylinder.

8. The boom-to-tower connection system of a tower crane according to claim 7, characterized in that, The cylinder and the side pin (15) of the lifting arm are integrally formed.

9. The boom-to-tower connection system of a tower crane according to any one of claims 1 to 8, characterized in that, The second connecting ear plate (14) is provided with a pressure bearing pad (16) in the middle.

10. The boom-to-tower connection system of a tower crane according to any one of claims 1 to 8, characterized in that, The first connecting ear plate (13) has a U-shaped groove (19) in the middle.

11. A tower crane, characterized in that, The tower crane is provided with a boom-to-tower connection system according to any one of claims 1 to 10.

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