Middle supporting leg rotating device of bridge girder erection machine

Abstract

The utility model discloses a middle supporting leg rotating device of a bridge girder erection machine, which comprises a fixed seat, a driving shaft and a driving gear are arranged on the fixed seat, a cavity is arranged in the driving gear, a fixed block and a movable block are arranged in the cavity, a movable spring is arranged between the fixed block and the movable block, a lubricating groove is arranged between teeth of the driving gear, a plug is arranged on the movable block, and the driving shaft and the driving gear are arranged in the cavity. A movable plate is arranged on the movable block, a limiting frame is arranged on one side of the fixed seat, a limiting screw rod and a limiting rack are arranged on the limiting frame, the movable plate is extruded through the transmission gear, the movable block and the plug are driven to move, then the lubricating groove is opened, lubricating oil in the cavity flows out through the lubricating groove, and therefore the lubricating effect is achieved. And the limiting rack is driven by the limiting screw rod to move on the limiting frame, so that the limiting rack is conveniently aligned with the teeth of the driving gear, and the stability of the positions of the driving gear and the middle supporting leg is further improved.

Description

Technical Field

[0001] This utility model relates to the field of bridge erecting machine technology, and more specifically, it relates to a middle support leg rotating device for a bridge erecting machine. Background Technology

[0002] With the rapid development of my country's transportation infrastructure construction, bridge erecting machines, as the core equipment for bridge construction, directly affect the quality of the project and the efficiency of construction. At present, the construction of highway and railway bridges is developing towards large spans and heavy loads, which puts forward higher requirements for the performance of bridge erecting machines. The central support leg rotation device of the bridge erecting machine is a key component to ensure that the bridge erecting machine can flexibly adjust its position during construction and adapt to the erection of different bridge spans and curved sections.

[0003] Chinese patent application number 202121276890.0 discloses a leg rotation device in a bridge erecting machine. After the drive gear has rotated, the push block can only slide along one side of the T-slot, which cannot guarantee that the teeth of the push block will mesh precisely with the teeth of the drive gear each time. At the same time, there is no lubrication device between the drive gear and the drive gear, which leads to increased frictional wear of the gear components, reduced transmission efficiency, reduced equipment reliability, and reduced gear transmission accuracy. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a middle support leg rotation device for a bridge erecting machine to solve the technical problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a rotating device for the middle support leg of a bridge erecting machine, comprising a fixed base, a drive shaft on the fixed base, a drive gear on the drive shaft, a cavity inside the drive gear, a fixed block and a moving block circumferentially arranged inside the cavity, a moving spring between the fixed block and the moving block, a lubrication groove between the teeth of the drive gear, a plug that mates with the lubrication groove on the moving block, moving grooves between the teeth on both sides of the lubrication groove, a moving plate that mates with the moving groove on the moving block, a limiting frame on one side of the fixed base, a limiting screw rotatably mounted on the limiting frame, a limiting knob at one end of the limiting screw, and a limiting rack threadedly connected to the limiting screw.

[0008] The present invention is further configured such that an oil supply pipe is provided on the inner side of the drive shaft, and an oil supply hole is provided in the circumferential communication between the oil supply pipe and the cavity, so as to facilitate the injection of lubricating oil into the cavity.

[0009] The present invention is further configured such that a first transmission shaft and a second transmission shaft are provided on both sides of the drive gear, and transmission gears are provided on the first transmission shaft and the second transmission shaft, which drive the drive gear to rotate.

[0010] The present invention is further configured such that a transmission motor is provided at the bottom of the first transmission shaft, a rotating shaft is rotatably provided inside the fixed base, and rotating gears are provided on the rotating shaft and the second transmission shaft. The transmission motor drives the first transmission shaft to rotate, and the second transmission shaft is driven to rotate through the cooperation of the rotating shaft and the rotating gears.

[0011] The present invention is further configured such that a synchronous belt drive assembly is provided between the first drive shaft and the rotating shaft to realize the synchronous rotation of the first drive shaft and the second drive shaft.

[0012] The present invention is further provided that the drive shaft is provided with a rotating ring on the fixed base, which improves the rotational stability of the drive shaft.

[0013] The present invention is further configured such that the fixed base is provided with a sliding groove, and the bottom of the limiting frame is provided with a sliding block that cooperates with the sliding groove to limit the movement direction of the limiting frame.

[0014] The present invention is further configured such that an adjustment box is provided on one side of the sliding groove, and an adjustment screw is rotatably provided inside the adjustment box. The adjustment screw is threadedly connected to the sliding block, which facilitates the adjustment of the position of the limiting rack.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a rotating device for the middle support leg of a bridge erecting machine, which has the following beneficial effects:

[0017] 1. Lubricating oil is injected into the cavity through the oil supply pipe and oil supply hole. The transmission gear squeezes the moving plate, which drives the moving block and the plug to move, thereby opening the lubrication groove. The lubricating oil in the cavity flows out through the lubrication groove, thereby lubricating the transmission gear and the drive gear and reducing wear between the teeth.

[0018] 2. By adjusting the screw, the sliding block moves within the sliding groove, which in turn moves the limiting frame. The limiting screw then moves the limiting rack on the limiting frame, facilitating alignment between the limiting rack and the teeth of the drive gear, thereby further improving the stability of the drive gear's position.

[0019] 3. The drive motor drives the first drive shaft and the rotating shaft to rotate synchronously through the synchronous belt drive assembly, and through the cooperation of the rotating gear, the first drive shaft and the second drive shaft rotate synchronously, thereby synchronously driving the drive gear to rotate. The rotating ring further improves the rotation smoothness of the drive shaft and the drive gear. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the middle support leg rotating device of a bridge erecting machine according to the present invention;

[0021] Figure 2 This is a cross-sectional view of the drive gear in this utility model;

[0022] Figure 3 for Figure 2 A magnified schematic diagram of a portion of the structure of A in the diagram;

[0023] Figure 4 This is a schematic diagram of the internal structure of the fixing base in this utility model;

[0024] Figure 5 This is a schematic diagram of the cooperative structure of the limiting frame, limiting screw, limiting knob, limiting rack, adjusting box and adjusting screw in this utility model.

[0025] In the diagram: 1. Fixed base; 2. Drive shaft; 3. Drive gear; 4. Cavity; 5. Fixed block; 6. Moving block; 7. Moving spring; 8. Lubrication groove; 9. Plug; 10. Moving groove; 11. Moving plate; 12. Limiting bracket; 13. Limiting screw; 14. Limiting knob; 15. Limiting rack; 16. Oil supply pipe; 17. Oil supply hole; 18. First drive shaft; 19. Second drive shaft; 20. Drive gear; 21. Drive motor; 22. Rotating shaft; 23. Rotating gear; 24. Synchronous belt drive assembly; 25. Rotating ring; 26. Sliding groove; 27. Sliding block; 28. Adjusting box; 29. ​​Adjusting screw. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] Please see Figures 1-5A rotating device for the middle support leg of a bridge erecting machine includes a fixed base 1, a drive shaft 2 on the fixed base 1, a drive gear 3 on the drive shaft 2, a cavity 4 inside the drive gear 3, a fixed block 5 and a movable block 6 inside the cavity 4, a movable spring 7 between the fixed block 5 and the movable block 6, a lubrication groove 8 between the teeth of the drive gear 3, a plug 9 on the movable block 6 that mates with the lubrication groove 8, movable grooves 10 between the teeth on both sides of the lubrication groove 8, a movable plate 11 on the movable block 6 that mates with the movable groove 10, a limiting frame 12 on one side of the fixed base 1, a limiting screw 13 rotatably mounted on the limiting frame 12, a limiting knob 14 at one end of the limiting screw 13, a limiting rack 15 threadedly connected to the limiting screw 13, an oil supply pipe 16 inside the drive shaft 2, and an oil supply hole 17 circumferentially connected between the oil supply pipe 16 and the cavity 4.

[0030] In this embodiment, the oil supply pipe 16 of the drive shaft 2 is connected to the lubricating oil tank and the lubricating oil is delivered by the oil pump. The lubricating oil is input into the cavity 4 through the communication between the oil supply pipe 16 and the oil supply hole 17. When the transmission gear 20 meshes with the drive gear 3 and drives the drive gear 3 to rotate, the transmission gear 20 first squeezes the moving plate 11. The moving plate 11 drives the moving block 6 to move inward to the cavity 4 and squeezes the moving spring 7. When the moving block 6 moves, it drives the plug 9 to leave the lubrication groove 8, so that the lubricating oil flows out through the lubrication groove 8 between the transmission gear 20 and the drive gear 3, thereby lubricating the transmission gear 20 and the drive gear 3. When the transmission gear 20 passes between the teeth of the moving plate 11, the moving block 6 extends outward under the elastic force of the moving spring 7, thereby driving the moving plate 11 to slide outward along the moving groove 10, so that the plug 9 blocks the lubrication groove 8, thereby preventing the lubricating oil from continuing to leak out and causing waste of lubricating oil.

[0031] Please see Figures 4-5 As one embodiment of rotating the drive gear 3: the drive gear 3 is provided with a first transmission shaft 18 and a second transmission shaft 19 on both sides, and a transmission gear 20 is provided on the first transmission shaft 18 and the second transmission shaft 19. A transmission motor 21 is provided at the bottom of the first transmission shaft 18. A rotating shaft 22 is rotatably provided inside the fixed base 1. A rotating gear 23 is provided on the rotating shaft 22 and the second transmission shaft 19. A synchronous belt transmission assembly 24 is provided between the first transmission shaft 18 and the rotating shaft 22. A rotating ring 25 is provided on the fixed base 1 for the drive shaft 2. A sliding groove 26 is provided on the fixed base 1. A sliding block 27 that cooperates with the sliding groove 26 is provided at the bottom of the limiting frame 12. An adjustment box 28 is provided on one side of the sliding groove 26. An adjustment screw 29 is rotatably provided inside the adjustment box 28. The adjustment screw 29 is threadedly connected to the sliding block 27.

[0032] More specifically, when the rotating device is in use, the drive motor 21 is started, which drives the first drive shaft 18 to rotate. Through the synchronous belt drive assembly 24, the rotating shaft 22 is driven to rotate. The rotating shaft 22, through the cooperation of the rotating gear 23, drives the second drive shaft 19 to rotate synchronously and in opposite directions with the first drive shaft 18, thereby driving the drive shaft 2 and the drive gear 3 to rotate. The drive shaft 2 rotates stably on the fixed seat 1 through the rotating ring 25. The drive shaft 2 drives the middle support leg to rotate. After the rotation is completed, the limit knob 14 is rotated, which drives the limit screw 13 to rotate. The limit screw 13 drives the limit rack 15 to be finely adjusted on the limit frame 12, so that the limit rack 15 corresponds to the tooth position of the drive gear 3. The adjusting screw 29 is rotated, which drives the sliding block 27 to move in the sliding groove 26, thereby driving the limit rack 15 to engage with the drive gear 3, fixing the position of the drive gear 3, and thus fixing the relative position of the middle support leg.

[0033] In summary, during the use or operation of the overall equipment: the oil supply pipe 16 of the drive shaft 2 is connected to the lubricating oil tank, and lubricating oil is supplied through the oil pump. Through the connection between the oil supply pipe 16 and the oil supply hole 17, the lubricating oil is input into the cavity 4. When the transmission gear 20 meshes with the drive gear 3 and drives the drive gear 3 to rotate, the transmission gear 20 first squeezes the moving plate 11. The moving plate 11 drives the moving block 6 to move inward to the cavity 4 and squeezes the moving spring 7. When the moving block 6 moves, it drives the plug 9 away from the lubrication groove 8, so that the lubricating oil flows out through the lubrication groove 8 to the space between the transmission gear 20 and the drive gear 3, thereby lubricating the space between the transmission gear 20 and the drive gear 3. When the transmission gear 20 passes between the teeth of the moving plate 11, the moving block 6 extends outward under the elastic force of the moving spring 7, thereby driving the moving plate 11 to slide outward along the moving groove 10, so that the plug 9 blocks the lubrication groove 8, thereby preventing the lubricating oil from continuing to leak out and causing waste of lubricating oil.

[0034] When the rotating device is in use, the drive motor 21 is started, which drives the first drive shaft 18 to rotate. Through the synchronous belt drive assembly 24, the rotating shaft 22 is driven to rotate. The rotating shaft 22, through the cooperation of the rotating gear 23, drives the second drive shaft 19 to rotate synchronously and in opposite directions with the first drive shaft 18. This, in turn, drives the drive shaft 2 and the drive gear 3 to rotate. The drive shaft 2 rotates stably on the fixed seat 1 through the rotating ring 25. The drive shaft 2 drives the middle support leg to rotate. After the rotation is completed, the limit knob 14 is rotated, which drives the limit screw 13 to rotate. The limit screw 13 drives the limit rack 15 to be finely adjusted on the limit frame 12, so that the limit rack 15 corresponds to the tooth position of the drive gear 3. The adjusting screw 29 is rotated, which drives the sliding block 27 to move in the sliding groove 26, thereby driving the limit rack 15 to engage with the drive gear 3, fixing the position of the drive gear 3, and thus fixing the relative position of the middle support leg.

[0035] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0036] In all the solutions mentioned above, the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

[0037] In all the solutions mentioned above, those involving the operation of electrical components, unless otherwise specified, are controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies, and their electrical connection relationships and specific circuit structures will not be elaborated here.

[0038] Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies, and this utility model will not elaborate on them.

Claims

1. A rotating device for the middle support leg of a bridge erecting machine, comprising a fixed base (1), characterized in that: The fixed base (1) is provided with a drive shaft (2), the drive shaft (2) is provided with a drive gear (3), the drive gear (3) is provided with a cavity (4), the cavity (4) is provided with a fixed block (5) and a moving block (6) in the circumferential direction, a moving spring (7) is provided between the fixed block (5) and the moving block (6), a lubrication groove (8) is provided between the teeth of the drive gear (3), and a plug that cooperates with the lubrication groove (8) is provided on the moving block (6). The head (9) has a moving groove (10) between the teeth on both sides of the lubrication groove (8). The moving block (6) is provided with a moving plate (11) that cooperates with the moving groove (10). The fixed seat (1) is provided with a limiting frame (12) on one side. The limiting frame (12) is rotatably provided with a limiting screw (13). One end of the limiting screw (13) is provided with a limiting knob (14). The limiting screw (13) is threadedly connected with a limiting rack (15).

2. The middle support leg rotating device of a bridge erecting machine according to claim 1, characterized in that: The drive shaft (2) is provided with an oil supply pipe (16) inside, and the oil supply pipe (16) is circumferentially connected to the cavity (4) with an oil supply hole (17).

3. The middle support leg rotating device of a bridge erecting machine according to claim 1, characterized in that: The drive gear (3) has a first drive shaft (18) and a second drive shaft (19) on both sides, and a drive gear (20) is provided on the first drive shaft (18) and the second drive shaft (19).

4. The middle support leg rotating device of a bridge erecting machine according to claim 3, characterized in that: The bottom of the first drive shaft (18) is provided with a drive motor (21), and the fixed base (1) is provided with a rotating shaft (22) inside. The rotating shaft (22) and the second drive shaft (19) are provided with rotating gears (23).

5. The middle support leg rotating device of a bridge erecting machine according to claim 4, characterized in that: A synchronous belt drive assembly (24) is provided between the first drive shaft (18) and the rotating shaft (22).

6. The middle support leg rotating device of a bridge erecting machine according to claim 1, characterized in that: The drive shaft (2) is provided with a rotating ring (25) on the fixed base (1).

7. The middle support leg rotating device of a bridge erecting machine according to claim 1, characterized in that: The fixed base (1) is provided with a sliding groove (26), and the bottom of the limiting frame (12) is provided with a sliding block (27) that cooperates with the sliding groove (26).

8. The middle support leg rotating device of a bridge erecting machine according to claim 7, characterized in that: An adjustment box (28) is provided on one side of the sliding groove (26), and an adjustment screw (29) is rotatably provided inside the adjustment box (28). The adjustment screw (29) is threadedly connected to the sliding block (27).

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