Prefabricated small box girder unloading device
By setting up hoisting and limiting components on the small box girder, and using motors and electric push rods to achieve stable binding and limiting of the steel wires, the problem of unstable center of gravity during the hoisting process of the small box girder was solved, and construction safety was improved.
Patent Information
- Application Number
- CN202520135833.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-21
AI Technical Summary
In existing technologies, the center of gravity of small box girders is unstable during hoisting, which can easily lead to safety accidents.
A prefabricated small box girder unloading device was designed, including a hoisting component and a limiting component. The device uses a motor-driven wire winding wheel for fixing and an electric push rod to push the movable arm to make the fixing plate fit tightly against the bottom surface of the small box girder, thus achieving stable limiting.
This improved the safety of the small box girder hoisting process, avoided the instability of the center of gravity caused by the movement of the steel wire, and ensured the stability and safety of the construction process.
Smart Images
Figure CN223836901U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of small box girder manufacturing technology, and more specifically, to a prefabricated small box girder unloading device. Background Technology
[0002] Small box girders are a type of beam used in bridge engineering. They are hollow inside with flanges on both sides of the upper part. During bridge construction, trucks or trailers are used to transport the small box girders to the construction site, and hoisting equipment is used to unload them from the trucks or trailers to the designated erection position. In the existing technology, small box girders are mostly tied with steel wire ropes and hoisted and unloaded using equipment such as tower cranes or cranes. However, the steel wire fixing method is prone to displacement during hoisting and unloading, which can cause instability in the center of gravity of the small box girder and lead to safety accidents. Therefore, this utility model proposes a prefabricated small box girder unloading device to solve the above problems. Utility Model Content
[0003] (a) Technical problems to be solved
[0004] To address the shortcomings of existing technologies, this utility model provides a precast small box girder unloading device, which has the advantage of a firm fixing effect and solves the problem that existing devices are prone to causing instability of the center of gravity and safety accidents during the hoisting of small box girders.
[0005] (II) Technical Solution
[0006] To achieve the aforementioned goal of secure and safe hoisting, this utility model provides the following technical solution: a prefabricated small box girder unloading device, comprising a small box girder, on which a hoisting assembly and a limiting assembly are provided. The hoisting assembly includes two fixed frames on the small box girder, a hoisting frame on one side of the fixed frames, a motor on one side of the hoisting frame, a winding wheel on the output shaft of the motor, and a steel wire outside the winding wheel. The limiting assembly includes two movable rings on the front and rear sides of the fixed frames, a connecting arm on one side of the movable rings, a movable arm on the other side of the movable rings, and an electric push rod on one side of the movable arm.
[0007] In an embodiment of this utility model, two lifting rings are rotatably arranged on the lifting frame, and two guide wheels are rotatably arranged on both the left and right sides of the fixing frame.
[0008] In an embodiment of this utility model, the back end of the winding wheel is rotatably connected to the hoisting frame, and the two fixing frames are symmetrically distributed front and back with respect to the vertical line of the small box girder.
[0009] In an embodiment of this utility model, the left and right sides of the steel wire are in contact with the guide wheel, and the bottom of the steel wire is in contact with the bottom of the small box girder.
[0010] In an embodiment of this utility model, movable columns are rotatably provided on both the front and rear sides of the fixed frame, and two fixed platforms are fixedly provided on both the left and right sides of the top of the fixed frame. Movable frames are fixedly provided on one side of the fixed platform and the movable arm.
[0011] In an embodiment of this utility model, the movable ring is fixedly disposed outside the movable column, and the two ends of the electric push rod are respectively rotatably connected to two adjacent movable frames.
[0012] In an embodiment of this utility model, a fixing plate is provided on one side of the connecting arm, and the fixing plate is circular in design.
[0013] In an embodiment of this utility model, an anti-slip pad is provided on the top of the fixing plate, and the anti-slip pad is in close contact with the bottom surface of the small box girder.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0015] This utility model is equipped with a structure including steel wire and a motor. The motor can be used to wind up the steel wire to bind and fix the small box girder. At the same time, the electric push rod pushes the movable arm to rotate, causing the fixing plate to move closer to the side of the small box girder. This allows the anti-slip pad to fit tightly against the bottom of the small box girder, thus limiting the position of the small box girder and preventing the steel wire from shifting during the hoisting and unloading process, which could lead to instability of the hoisting center of gravity and cause safety accidents.
[0016] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This utility model provides an overall structural schematic diagram of its embodiments;
[0019] Figure 2A schematic diagram of the limiting component provided in this embodiment of the utility model;
[0020] Figure 3 A schematic diagram of the connection structure between the steel wire and the winding wheel provided for an embodiment of this utility model.
[0021] In the diagram: 10. Small box girder; 20. Fixed frame; 2001. Lifting frame; 2002. Lifting ring; 2003. Motor; 2004. Winding wheel; 2005. Steel wire; 2006. Guide wheel; 21. Movable ring; 2101. Connecting arm; 2102. Fixed plate; 2103. Movable arm; 2104. Fixed platform; 2105. Movable frame; 2106. Electric push rod; 2107. Movable column. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0024] Please see Figure 1-2This utility model provides a technical solution: a prefabricated small box girder unloading device, including a small box girder 10, on which a hoisting assembly and a limiting assembly are provided. The hoisting assembly includes two fixed frames 20 on the small box girder 10, a hoisting frame 2001 on one side of the fixed frame 20, a motor 2003 on one side of the hoisting frame 2001, a winding wheel 2004 on the output shaft of the motor 2003, and a steel wire 2005 outside the winding wheel 2004. When it is necessary to unload the small box girder 10... When unloading from a truck or trailer, place two fixing frames 20 on the front and rear sides of the top of the small box girder 10, ensuring that the two fixing frames 20 are symmetrically distributed. During this process, place the steel wire 2005 at the bottom of the small box girder 10, then start the motor 2003 to drive the winding wheel 2004 to rotate and tighten the steel wire 2005, so that the steel wire 2005 binds and fixes the small box girder 10. Finally, use a tower crane or other lifting equipment to hook the lifting ring 2002 to lift and unload the small box girder 10 to the designated position.
[0025] In this embodiment, two lifting rings 2002 are rotatably provided on the lifting frame 2001 for hooking and lifting the small box girder 10 by lifting equipment such as tower cranes or cranes. Two guide wheels 2006 are rotatably provided on both the left and right sides of the fixed frame 20 to prevent the steel wire 2005 from rubbing against the small box girder 10 or the side of the fixed frame 20, thus avoiding wear.
[0026] The back end of the winding wheel 2004 is rotatably connected to the hoisting frame 2001. The motor 2003 drives the winding wheel 2004 to rotate in both directions to release or tighten the steel wire 2005. The two fixed frames 20 are symmetrically distributed front and back around the vertical line of the small box girder 10.
[0027] It should be noted that the left and right sides of the steel wire 2005 are in contact with the guide wheel 2006, and the bottom of the steel wire 2005 is in contact with the bottom of the small box girder 10, so as to avoid wear on the steel wire 2005, the fixing frame 20 and the small box girder 10.
[0028] Please see Figure 2-3 The limiting component includes two movable rings 21 on the front and rear sides of the fixed frame 20, a connecting arm 2101 on one side of the movable ring 21, a movable arm 2103 on the other side of the movable ring 21, and an electric push rod 2106 on one side of the movable arm 2103. A fixing plate 2102 is provided on one side of the connecting arm 2101. The fixing plate 2102 is circular. After the steel wire 2005 has fixed the small box girder 10, the electric push rod 2106 is activated to push the connecting arm 2101 to rotate. Furthermore, the connecting arm 2101 drives the movable arm 2103 to rotate towards the side closer to the bottom surface of the small box girder 10. Finally, the fixing plate 2102 applies pressure to the bottom surface of the small box girder 10 to play a limiting role, so as to prevent the steel wire 2005 from moving during the hoisting process and causing the hoisting center of gravity to be unstable.
[0029] In this embodiment, movable columns 2107 are rotatably provided on both the front and rear sides of the fixed frame 20, and two fixed platforms 2104 are fixedly provided on both the left and right sides of the top of the fixed frame 20. Movable frames 2105 are fixedly provided on one side of the fixed platform 2104 and the movable arm 2103.
[0030] It is understandable that the movable ring 21 is fixedly installed on the outside of the movable column 2107, and the two ends of the electric push rod 2106 are respectively rotatably connected to the two adjacent movable frames 2105.
[0031] It should be emphasized that the top of the fixing plate 2102 is provided with an anti-slip pad, which is in close contact with the bottom surface of the small box girder 10. The anti-slip pad can increase the friction with the bottom surface of the small box girder 10, thereby increasing the effect of the limiting component.
[0032] Specifically, the working principle of this precast small box girder unloading device is as follows:
[0033] When using the small box girder 10 for bridge construction, firstly, the small box girder 10 is transported to the construction site using a trailer or truck. Then, two fixing frames 20 are placed on the front and rear sides of the top of the small box girder 10, ensuring that the two fixing frames 20 are symmetrically distributed front and back. During this process, steel wire 2005 is placed at the bottom of the small box girder 10. Then, the motor 2003 is started to drive the winding wheel 2004 to rotate and tighten the steel wire 2005, so that the steel wire 2005 binds and fixes the small box girder 10. After the steel wire 2005 has been fixed to the small box girder 10... The electric push rod 2106 is activated to drive the connecting arm 2101 to rotate. The connecting arm 2101 then drives the movable arm 2103 to rotate towards the side closer to the bottom surface of the small box girder 10. Finally, the fixed plate 2102 applies pressure to the bottom surface of the small box girder 10 to limit its movement, preventing the steel wire 2005 from shifting during the hoisting process and causing instability in the hoisting center of gravity, thus improving safety during construction. Finally, the small box girder 10 can be hoisted and unloaded to the designated position by hooking the hoisting ring 2002 with a tower crane or other hoisting equipment.
[0034] It should be noted that the specific models and specifications of the fixing frame 20, the lifting frame 2001, the lifting ring 2002, the motor 2003, the steel wire 2005, and the electric push rod 2106 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail.
[0035] The power supply and operating principle of the motor 2003 and the electric push rod 2106 are clear to those skilled in the art and will not be described in detail here.
[0036] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0037] Furthermore, the terms "first," "second," "third," and "fourth" 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. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.
[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A precast small box girder unloading device, comprising a small box girder (10), characterized in that: The small box girder (10) is provided with a hoisting assembly and a limiting assembly. The hoisting assembly includes two fixed frames (20) on the small box girder (10), a hoisting frame (2001) on one side of the fixed frame (20), a motor (2003) on one side of the hoisting frame (2001), a winding wheel (2004) on the output shaft of the motor (2003), and a steel wire (2005) outside the winding wheel (2004). The limiting assembly includes two movable rings (21) on the front and rear sides of the fixed frame (20), a connecting arm (2101) on one side of the movable ring (21), a movable arm (2103) on the other side of the movable ring (21), and an electric push rod (2106) on one side of the movable arm (2103).
2. The precast small box girder unloading device according to claim 1, characterized in that, Two lifting rings (2002) are rotatably mounted on the lifting frame (2001), and two guide wheels (2006) are rotatably mounted on both the left and right sides of the fixing frame (20).
3. The precast small box girder unloading device according to claim 2, characterized in that, The back end of the winding wheel (2004) is rotatably connected to the hoisting frame (2001), and the two fixing frames (20) are symmetrically distributed front and back with respect to the vertical line of the small box girder (10).
4. The precast small box girder unloading device according to claim 3, characterized in that, The left and right sides of the steel wire (2005) are in contact with the guide wheel (2006), and the bottom of the steel wire (2005) is in contact with the bottom of the small box girder (10).
5. The precast small box girder unloading device according to claim 1, characterized in that, Movable columns (2107) are rotatably provided on both the front and rear sides of the fixed frame (20). Two fixed platforms (2104) are fixedly provided on both the left and right sides of the top of the fixed frame (20). Movable frames (2105) are fixedly provided on one side of the fixed platform (2104) and the movable arm (2103).
6. The precast small box girder unloading device according to claim 5, characterized in that, The movable ring (21) is fixedly installed outside the movable column (2107), and the two ends of the electric push rod (2106) are rotatably connected to two adjacent movable frames (2105).
7. The precast small box girder unloading device according to claim 1, characterized in that, A fixing plate (2102) is provided on one side of the connecting arm (2101), and the fixing plate (2102) is circular in design.
8. The precast small box girder unloading device according to claim 7, characterized in that, The top of the fixing plate (2102) is provided with an anti-slip pad, which is in close contact with the bottom surface of the small box girder (10).