Foldable main truss

Abstract

The invention relates to a foldable main truss which specifically comprises a first truss, a second truss, a transmission mechanism and a locking device, and the first truss and the second truss play a supporting role. The transmission mechanism comprises a first connecting rod, a second connecting rod and a telescopic driving part. The first connecting rod is hinged to the first truss. The second connecting rod is hinged to the second truss. The first hinge plate of the first truss is hinged to the second hinge plate of the second truss, so that the first truss rotates relative to the second truss. The two ends of the transmission mechanism are connected to the sides, back to the bridge, of the first truss and the second truss correspondingly and used for driving the first truss to be folded to the second truss. The second truss, the second connecting rod, the first-stage piston rod, the second-stage piston rod and the oil cylinder body form a hinge four-rod mechanism, and the second connecting rod, the first connecting rod, the first truss and the second truss form another hinge four-rod mechanism. Therefore, complete folding and unfolding of the main truss are achieved.

Description

Technical Field

[0001] The invention relates to the field of cantilever bridge-building machines, and in particular to a foldable main truss structure of a cantilever bridge-building machine. Background Art

[0002] While my country's high-speed railway construction is booming, my country's bridge construction level has also been greatly improved. When the railway line crosses an important traffic road or river, it is often necessary to use a large-span cantilever continuous beam. When a bridge-building machine is used to construct the cantilever continuous beam, it is not restricted by the terrain and the surrounding traffic environment, which can minimize the interference with traffic and ensure the safe passage of vehicles. At the same time, it can also ensure that the linear shape of the continuous beam meets the requirements. The bridge-building machine is a movable concrete pouring equipment widely used in bridge and road construction. It is mainly composed of a support system, a formwork system, and a pouring system. During the bridge construction process, the concrete beam section is poured by unfolding and fixing the mobile formwork. The bridge-building machine has a large load-bearing capacity, small elastic deformation, accurate positioning, and has the advantages of high efficiency, high speed, and strong reliability. It is often used in the following aspects: road and bridge construction, railway bridge construction, military engineering, mining and port engineering, etc.

[0003] As the main load-bearing structure of the bridge-building machine, the main truss is a plane truss structure composed of upper and lower chords and webs. The main truss components are mainly triangular trusses, and H-shaped and box-shaped nodes that run through the upper and lower chords are distributed between the trusses; the truss, as the most important part of the overall structure, not only connects the truss segments, but also connects to the secondary arches on both sides, and plays an important role in the overall structure of the project. In conventional cantilever bridge-building machines, the main truss and the tail frame are hoisted to appropriate positions and then connected with bolts. This solution has the following shortcomings: 1) The main truss and the tail frame are easily hit against the bridge body during the process of separate hoisting, which can easily cause deformation and damage to the beam frame; 2) After hoisting, the main truss and the tail frame are difficult to disassemble and assemble, which consumes manpower and working hours; Therefore, in response to this problem, the present invention proposes a foldable integrated main truss structure, which does not need to be connected to the tail frame, and can be automatically locked when folded to a specified position. Summary of the invention

[0004] In order to solve the existing problems, the team of Changsha University of Science and Technology and the team of Hunan Wuxin Intelligent Technology Co., Ltd. cooperated to propose a foldable main truss to solve the problems in the existing technology that the main truss is difficult to hoist and assemble, resulting in low efficiency, low automation, and easy deformation and damage of the beam when hoisted separately.

[0005] In order to achieve the above-mentioned purpose, a foldable main truss is provided, which comprises a first truss, a second truss, a transmission mechanism, and a locking device. The two ends of the transmission mechanism are respectively connected to the first truss and the second truss on the side facing away from the bridge. The transmission mechanism is used to drive the first truss to rotate relative to the second truss, so as to realize the folding of the first truss on the second truss.

[0006] As a further improvement of the present invention, the cross bridge of the first truss is symmetrically distributed with first hinged plates on both sides upward and downward, and the cross bridge of the second truss is symmetrically distributed with second hinged plates on both sides upward and downward, and the first hinged plate and the second hinged plate are hinged to each other to realize the rotation of the first truss relative to the second truss.

[0007] As a further improvement of the present invention, the top and bottom of the first truss are provided with a first hinged plate, the top and bottom of the second truss are provided with a second hinged plate, and the top of the first truss and the top of the second truss, as well as the bottom of the first truss and the bottom of the second truss can achieve relative rotation.

[0008] As a further improvement of the present invention, the transmission mechanism includes: a first connecting rod, a second connecting rod, and a telescopic driving member. The telescopic driving member is preferably a hydraulic cylinder, including: a first-stage piston rod, a second-stage piston rod, and a cylinder body. The first connecting rod is hinged to the first truss, the second connecting rod is hinged to the second truss, and the first connecting rod and the second connecting rod are hinged to each other. The top end of the telescopic end of the first-stage piston rod of the telescopic driving member is hinged to the second connecting rod, and the cylinder body of the telescopic oil cylinder is hinged to the second truss. In the transmission mechanism, the second truss, the second connecting rod, the first-stage piston rod, the second-stage piston rod, and the cylinder body form a hinged four-bar mechanism. When the first-stage piston rod or the second-stage piston rod is telescoped in the cylinder body, the second connecting rod can be driven to swing; the second connecting rod, the first connecting rod, the first truss, and the second truss form a hinged four-bar mechanism. When the second connecting rod swings, the first truss can be driven to rotate around the second truss, so that the first truss and the second truss can be completely folded and unfolded under the action of the transmission mechanism.

[0009] As a further improvement of the present invention, the locking device includes: a driving component, a fixing component, and a locking piece. The driving component includes: a motor, a driving gear, and a driven gear. The fixing component includes: a bracket and a rolling bearing. The driving component is arranged on the second truss, and the fixing component is arranged on the top of the second truss. The fixing component is rotationally connected to the locking piece, and the driving component is threadedly connected to the locking piece. The driving component drives the locking piece to move up and down to complete the locking and unlocking of the first truss and the second truss. The motor is fixedly mounted on the second hinge plate of the second truss, the driving gear is connected to the output shaft of the motor, and the shaft hole of the driven gear is threaded, and the locking piece passes through it and is threadedly connected to the shaft hole of the driven gear. Threaded holes are formed on both the first hinge plate and the second hinge plate. When the first truss is fully expanded to 180° with the second truss, the motor rotates forward, thereby driving the locking piece to move downward and connect with the threaded holes of the second hinge plate and the first hinge plate, thereby locking the second truss and the first truss; when the first truss needs to rotate around the second truss, the motor rotates reversely, thereby driving the locking piece to move upward and disengage from the threaded holes of the second hinge plate and the first hinge plate, thereby unlocking the second truss and the first truss.

[0010] As a further improvement of the present invention, the transmission mechanism is used to control the folding and unfolding of the first truss and the second truss, and the transmission mechanism can adjust the folding degree of the first truss and the second truss within 0° to 180°. When the first truss is fully unfolded, the locking device can lock the first truss and the second truss. When the second truss needs to be folded, the locking device can unlock the first truss and the second truss.

[0011] Compared with the prior art, the above-mentioned foldable main truss structure has the following beneficial effects.

[0012] ① Strong automation. The hinged four-bar mechanism consisting of the second truss, the second connecting rod, the first-stage piston rod, the second-stage piston rod, and the oil cylinder body and another hinged four-bar mechanism consisting of the second connecting rod, the first connecting rod, the first truss, and the second truss are used to drive the first truss to rotate around the second truss, thereby realizing the 180° complete folding and unfolding of the main truss. When the first truss is fully unfolded, the locking device can lock the first truss and the second truss; when the first truss needs to be folded, the locking device can unlock the first truss and the second truss. The combined action of the transmission mechanism and the locking device improves the automation of the working process of the first truss rotating around the second truss.

[0013] ② High work efficiency. In a preferred embodiment of the present invention, the main truss is separated into a first truss and a second truss, the first truss and the second truss are respectively hinged to each other with the transmission mechanism, and can be folded under the action of the transmission mechanism, so that no secondary assembly is required after hoisting, the working hours are reduced, and the work efficiency is improved.

[0014] ③ Good stress-bearing performance. In the preferred embodiment of the present invention, the first truss and the second truss are respectively hinged to each other with the transmission mechanism, and the first truss is folded around the second truss before being hoisted. The stress-bearing area during the hoisting process is reduced, the deformation and damage of the beam frame during the hoisting process are reduced, and the stress-bearing performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention when it is fully unfolded;

[0016] Figure 2 It is a schematic diagram of the structure of the present invention when the structure is in a semi-folded state;

[0017] Figure 3 is a schematic diagram of the structure of the present invention when it is fully folded;

[0018] Figure 4 yes Figure 1 A schematic diagram of the structure of the first truss in FIG.

[0019] Figure 5 yes Figure 1 A schematic diagram of the structure of the second truss;

[0020] Figure 6 yes Figure 1 A schematic top view of the structure of the transmission mechanism in FIG.

[0021] Figure 7 yes Figure 1 A schematic diagram of the structure of the locking device in FIG.

[0022] Figure 8 yes Figure 6 Schematic diagram of the telescopic drive structure.

[0023] above Figures 1 to 8 The markings are: 1. first truss, 1-1. first hinged plate; 2. second truss, 2-1. second hinged plate; 3. transmission mechanism, 3-1. first connecting rod, 3-2. second connecting rod, 3-3. telescopic driving member, 3-3-1. first-stage piston rod, 3-3-2. second-stage piston rod, 3-3-3. cylinder body; 4. locking device, 4-1. driving assembly, 4-1-1. motor, 4-1-2. driving gear, 4-1-3. driven gear, 4-2. fixing assembly, 4-2-1. bracket, 4-2-2. rolling bearing, 4-3. locking member. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0027] The present invention discloses a foldable main truss, which is composed of a first truss 1, a second truss 2, a transmission mechanism 3, and a locking device 4. The transmission mechanism 3 includes: a first connecting rod 3-1, a second connecting rod 3-2, and a telescopic driving member 3-3. The telescopic driving member 3-3 includes: a first-stage piston rod 3-3-1, a second-stage piston rod 3-3-2, and a cylinder body 3-3-3. The locking device 4 includes: a driving component 4-1, a fixing component 4-2, and a locking member 4-3. The driving component 4-1 includes: a motor 4-1-1, a driving gear 4-1-2, and a driven gear 4-1-3. The fixing component 4-2 includes: a bracket 4-2-1, and a rolling bearing 4-2-2.

[0028] In this embodiment, preferably, the cross bridge of the first truss 1 has first hinged plates 1-1 symmetrically distributed on both sides upward and downward, and the cross bridge of the second truss 2 has second hinged plates 2-1 symmetrically distributed on both sides upward and downward, and the first hinged plate 1-1 and the second hinged plate 2-1 are hinged to each other to realize the rotation of the first truss 1 relative to the second truss 2.

[0029] In this embodiment, preferably, the transmission mechanism 3 includes: a first connecting rod 3-1, a second connecting rod 3-2, and a telescopic drive member 3-3. The telescopic drive member 3-3 is preferably a hydraulic cylinder, including: a first-stage piston rod 3-3-1, a second-stage piston rod 3-3-2, and a cylinder body 3-3-3. The first connecting rod 3-1 is hinged to the first truss 1, the second connecting rod 3-2 is hinged to the second truss 2, and the first connecting rod 3-1 and the second connecting rod 3-2 are hinged to each other. The top end of the telescopic end of the first-stage piston rod 3-3-1 of the telescopic drive member 3-3 is hinged to the second connecting rod 3-2, and the cylinder body 3-3-3 of the telescopic drive member 3-3 is hinged to the second truss 2. In the transmission mechanism 3, the second truss 2, the second connecting rod 3-2, the first-stage piston rod 3-3-1, the second-stage piston rod 3-3-2, and the cylinder body 3-3-3 form a hinged four-bar mechanism. When the first-stage piston rod 3-3-1 or the second-stage piston rod 3-3-2 is extended and retracted in the cylinder body 3-3-3, the second connecting rod 3-2 can be driven to swing; the second connecting rod 3-2, the first connecting rod 3-1, the first truss 1, and the second truss 2 form a hinged four-bar mechanism. When the second connecting rod 3-2 swings, the first truss 1 can be driven to rotate around the second truss 2, so that the first truss 1 and the second truss 2 can be completely folded and unfolded under the action of the transmission mechanism 3.

[0030] In this embodiment, preferably, the driving assembly 4-1 is arranged on the second truss 2-1, the fixing assembly 4-2 is arranged on the top of the second truss 2, and the fixing assembly 4-2 is rotationally connected to the locking member 4-3; the driving assembly 4-1 is threadedly connected to the locking member 4-3, and the driving assembly 4-1 drives the locking member 4-3 to move up and down, so as to complete the locking and unlocking of the first truss 1 and the second truss 2. The motor 4-1-1 is fixedly mounted on the second hinge plate 2-1 of the second truss 2, the driving gear 4-1-2 is connected to the output shaft of the motor 4-1-1, and the locking member 4-3 is threaded and threadedly connected to the shaft hole of the driven gear 4-1-3. The first hinge plate 1-1 and the second hinge plate 2-1 are both provided with threaded holes. When the first truss 1 is fully expanded to 180° with the second truss 2, the motor 4-1-1 rotates forward, driving the locking member 4-3 to move downward and connect with the threaded holes in the first hinge plate 1-1 and the second hinge plate 2-1, thereby locking the first truss 1 and the second truss 2; when the first truss 1 needs to rotate around the second truss 2, the motor 4-1-1 rotates reversely, driving the locking member 4-3 to move upward and disengage from the threaded holes in the first hinge plate 1-1 and the second hinge plate 2-1, thereby unlocking the first truss 1 and the second truss 2.

[0031] In this embodiment, preferably, the transmission mechanism 3 is used to control the folding and unfolding of the first truss 1 and the second truss 2. The transmission mechanism 3 can adjust the folding degree of the first truss 1 and the second truss 2 from 0° to 180°. When the first truss 1 is fully unfolded, the locking device 4 can lock the first truss 1 and the second truss 2; when the first truss 1 needs to be folded, the locking device 4 can unlock the first truss 1 and the second truss 2.

[0032] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent modifications of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

Claims

1. A foldable main truss, characterized in that: The invention comprises a first truss (1), a second truss (2), a transmission mechanism (3), and a locking device (4); the two ends of the transmission mechanism (3) are respectively connected to the first truss (1) and the second truss (2) on the side facing away from the bridge; the transmission mechanism (3) is used to drive the first truss (1) to rotate relative to the second truss (2), so as to realize the folding of the first truss (1) onto the second truss (2).

2. A foldable main truss according to claim 1, characterized in that: The first truss (1) has first hinged plates (1-1) symmetrically distributed on both sides of the cross bridge, and the second truss (2) has second hinged plates (2-1) symmetrically distributed on both sides of the cross bridge. The first hinged plates (1-1) and the second hinged plates (2-1) are hinged to each other to achieve rotation of the first truss (1) relative to the second truss (2).

3. A foldable main truss according to claim 2, characterized in that: The top and bottom of the first truss (1) are both provided with a first hinged plate (1-1); the top and bottom of the second truss (2) are both provided with a second hinged plate (2-1); the top of the first truss (1) and the top of the second truss (2), as well as the bottom of the first truss (1) and the bottom of the second truss (2) can both achieve relative rotation.

4. A foldable main truss according to any one of claims 1 to 3, characterized in that: The transmission mechanism (3) comprises: a first connecting rod (3-1), a second connecting rod (3-2), and a telescopic driving member (3-3); the first connecting rod (3-1) is hinged to the first truss (1); the second connecting rod (3-2) is hinged to the second truss (2); the first connecting rod (3-1) and the second connecting rod (3-2) are hinged to each other; two ends of the telescopic driving member (3-3) are respectively hinged to the second truss (2) and the second connecting rod (3-2), and the telescopic driving member (3-3) realizes relative rotation between the first truss (1) and the second truss (2) by driving the second connecting rod (3-2).

5. A foldable main truss according to claim 4, characterized in that: The telescopic driving member (3-3) is any one of a hydraulic cylinder, an electric cylinder and a pneumatic cylinder.

6. A foldable main truss according to claims 1 to 3, characterized in that: The locking device (4) comprises: a driving component (4-1), a fixing component (4-2), and a locking member (4-3); the driving component (4-1) is arranged on the second truss (2); the fixing component (4-2) is arranged on the top of the second truss (2); the fixing component (4-2) and the locking member (4-3) are rotationally connected; the driving component (4-1) and the locking member (4-3) are threadedly connected, and the driving component (4-1) drives the locking member (4-3) to move up and down, so as to complete the locking and unlocking of the first truss (1) and the second truss (2).

7. A foldable main truss according to claim 6, characterized in that: The driving assembly (4-1) comprises: a motor (4-1-1), a driving gear (4-1-2), and a driven gear (4-1-3); a thread is formed in the shaft hole of the driven gear (4-1-3), and the driving gear (4-1-2) is connected to the output shaft of the motor (4-1-1).

8. The foldable main truss according to claim 7, characterized in that: The fixing assembly (4-2) comprises: a bracket (4-2-1) and a rolling bearing (4-2-2); and the driven gear (4-1-3) of the driving assembly (4-1) is fixed on the bracket (4-2-1).

9. The foldable main truss according to claim 7, characterized in that: The locking member (4-3) is provided with a thread and is threadedly connected to the shaft hole of the driven gear (4-1-3); threaded holes are provided on the first hinge plate (1-1) and the second hinge plate (2-1); the motor (4-1-1) rotates forward, driving the locking member (4-3) to move downward and connect with the threaded holes in the first hinge plate (1-1) and the second hinge plate (2-1), thereby locking the first truss (1) and the second truss (2); the motor (4-1-1) rotates reversely, driving the locking member (4-3) to move upward and disengage from the threaded holes in the first hinge plate (1-1) and the second hinge plate (2-1), thereby unlocking the first truss (1) and the second truss (2).

10. A bridge-building machine, characterized in that: It comprises a foldable main truss as described in claims 1 to 9.

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