Box girder prestressed duct pipe penetrating and pulling machine

Abstract

The utility model belongs to box girder construction technical field especially relates to a box girder prestressed pipeline pipe penetrating and pipe pulling machine. Including support mechanism and pipe penetrating and pipe pulling mechanism, support mechanism includes mounting bracket, both ends of mounting bracket are fixedly installed with slide rod, pipe penetrating and pipe pulling mechanism includes moving frame, both ends of moving frame are slidably connected with slide rod, the inside rotation of moving frame is connected with adjusting frame, still include self -lock mechanism, self -lock mechanism includes two movable frame of being established in both ends of moving frame, the bottom of movable frame is slidably installed with a pair of clamping block, the opposite face of every pair of clamping block is fixedly installed with the brake band of embracing, and two clamping blocks drive the brake band along movable frame and move the slide rod of clamping tightly. The utility model discloses through self -lock mechanism can reliably fix the position of moving frame on slide rod, effectively prevent the equipment from accidentally falling from high place in the pipe penetrating and pipe pulling operation process, improved the security and practicality of box girder prestressed pipeline pipe penetrating and pipe pulling machine.

Description

Technical Field

[0001] This utility model relates to the field of box girder construction technology, specifically to a box girder prestressed duct insertion and extraction machine. Background Technology

[0002] In bridge construction, prestressed ducts are the core components that ensure the load-bearing capacity of box girder structures. By pre-setting metal or plastic corrugated pipes (i.e., prestressed ducts) inside the box girder, steel strands are inserted into the ducts and prestress is applied after the box girder concrete has been poured and reached the required strength. This can effectively offset the tensile stress of the box girder under load, prevent the box girder from cracking, and extend the service life of the bridge.

[0003] When using existing box girder prestressed duct threading and pulling machines, the height of the equipment is usually adjusted by using a winch or hoist and guide rail. However, because the guide rail lacks a self-locking mechanism, there are safety hazards when threading or pulling pipes at high positions, which can cause injury to surrounding operators. Utility Model Content

[0004] In view of the technical problems existing in the background art, this utility model provides a box girder prestressed duct threading and pulling machine.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A prestressed duct threading and pulling machine for box girders includes a support mechanism and a threading and pulling mechanism. The support mechanism includes a mounting frame, with sliding rods fixedly installed at both ends of the mounting frame. The threading and pulling mechanism includes a movable frame, with both ends of the movable frame slidably connected to the sliding rods. An adjustment frame is rotatably connected inside the movable frame. It also includes a self-locking mechanism, which includes two movable frames located at both ends of the movable frame. A pair of clamping blocks are slidably installed at the bottom of each movable frame. A brake is fixedly installed on the facing surface of each pair of clamping blocks. The two clamping blocks drive the brake to move along the movable frame towards each other to clamp the sliding rod.

[0006] Optionally, the movable frame is equipped with a rotatable bidirectional screw inside, with a slider threaded to both ends of the bidirectional screw, and the bottom end of the slider is fixedly connected to the top end of the clamping block.

[0007] Optionally, a worm gear is fitted at the center of the bidirectional screw, and a worm is meshed at the outer end of the worm gear. The worm is rotatably connected to the movable frame, and the worm gear and the worm are meshed together. A first drive motor is fixedly connected to the top of the movable frame, and the output end of the first drive motor is connected to the worm drive.

[0008] Optionally, a fixed frame is fixedly connected to the top of the adjustment frame, an auxiliary wheel is slidably connected to the top of one side of the fixed frame, a drive wheel is rotatably connected to the outer end of the fixed frame at the bottom of the auxiliary wheel, and a bearing plate and a positioning cylinder are respectively provided on the outer end of the fixed frame.

[0009] Optionally, an electric telescopic rod is fixedly connected to one side of the top of the mounting frame, and the output end of the electric telescopic rod is fixedly connected to the top of the auxiliary wheel.

[0010] Optionally, a second drive motor is fixedly connected to one side of the mounting bracket, and the output end of the second drive motor is connected to the drive wheel.

[0011] Optionally, a speed reducer is fixedly connected to one side of the movable frame. The output end of the speed reducer is driven by the central shaft of the adjusting frame. A third drive motor is installed at one end of the speed reducer, and the output end of the third drive motor is driven by the input end of the speed reducer.

[0012] Optionally, a pair of casters are fixedly installed on both sides of the bottom of the mounting frame, and a double-drum winch is fixedly installed on the top of the mounting frame. The two hooks of the double-drum winch are fixedly connected to the upper sides of the mobile frame (201) by cables.

[0013] This utility model has the following advantages and beneficial effects: This box girder prestressed duct threading and pulling machine effectively solves the safety hazard caused by the lack of a self-locking mechanism on the guide rail in the existing technology by setting a self-locking mechanism at both ends of the mobile frame, preventing the equipment from accidentally slipping from a high position during the threading and pulling operation, and ensuring the safety of the operators.

[0014] Meanwhile, the adjusting frame of the pipe threading and pulling mechanism can rotate and adjust its angle under the drive of the third drive motor and reducer. The driving wheel and auxiliary wheel on the fixed frame work together to clamp the prestressed pipe. The driving wheel rotates under the drive of the second drive motor to realize the automatic threading and pulling of the pipe. The electric telescopic rod can adjust the position of the auxiliary wheel to adapt to pipes of different diameters. The bearing plate and positioning cylinder provide pipe support and guidance functions, respectively. The whole system realizes the automation, safety and efficiency of prestressed pipe threading and pulling operations, and improves the convenience and safety of box girder construction. Attached Figure Description

[0015] Figure 1 The overall structure of the prestressed duct threading and pulling machine for box girders according to this utility model. Figure 1 ; Figure 2 The overall structure of the prestressed duct threading and pulling machine for box girders according to this utility model. Figure 2 ; Figure 3 This utility model Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a structural diagram of the self-locking mechanism of this utility model; Figure 5 This is a cross-sectional view of the self-locking mechanism of this utility model.

[0016] Attached figures: 1. Support mechanism; 101. Mounting frame; 102. Slide rod; 103. Caster wheel; 104. Double drum winch; 2. Pipe insertion and extraction mechanism; 201. Moving frame; 202. Adjusting frame; 203. Reducer; 204. Third drive motor; 205. Fixed frame; 206. Auxiliary wheel; 207. Electric telescopic rod; 208. Bearing plate; 209. Drive wheel; 210. Positioning cylinder; 211. Second drive motor; 3. Self-locking mechanism; 301. Movable frame; 302. First drive motor; 303. Clamping block; 304. Brake; 305. Bidirectional screw; 306. Slider; 307. Worm gear; 308. Worm. Detailed Implementation

[0017] 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 some embodiments of this utility model, but not all embodiments.

[0018] 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.

[0019] Example like Figures 1-5 As shown, a prestressed duct threading and pulling machine for box girders includes a support mechanism 1 and a threading and pulling mechanism 2. The support mechanism 1 includes a mounting frame 101, with slide rods 102 fixedly installed at both ends of the mounting frame 101. The threading and pulling mechanism 2 includes a movable frame 201, with both ends of the movable frame 201 slidably connected to the slide rods 102. An adjusting frame 202 is rotatably connected inside the movable frame 201. It also includes a self-locking mechanism 3, which includes two movable frames 301 located at both ends of the movable frame 201. A pair of clamping blocks 303 are slidably installed at the bottom of each movable frame 301. A brake 304 is fixedly installed on the facing surface of each pair of clamping blocks 303. The two clamping blocks 303 drive the brake 304 to move towards each other along the movable frame 301 to clamp the sliding rod 102.

[0020] Furthermore, the movable frame 301 is equipped with a rotatable bidirectional screw 305 inside. Both ends of the bidirectional screw 305 are threadedly connected to sliders 306. The bottom end of the slider 306 is fixedly connected to the top end of the clamping block 303. When the bidirectional screw 305 inside the movable frame 301 rotates, the sliders 306 at both ends can drive a pair of clamping blocks 303 to move synchronously in opposite directions, ensuring that the brake 304 clamps or releases the slide bar 102 evenly, avoiding unstable fixation due to unilateral force, and improving the reliability of the self-locking mechanism 3.

[0021] Furthermore, a worm gear 307 is sleeved at the center of the bidirectional screw 305, and a worm 308 is meshed at the outer end of the worm gear 307. The worm 308 is rotatably connected to the movable frame 301. The worm gear 307 and the worm 308 are meshed together. The top of the movable frame 301 is fixedly connected to a first drive motor 302. The output end of the first drive motor 302 is connected to the worm 308 for transmission. The first drive motor 302 drives the worm 308 to rotate. Through the meshing of the worm 308 and the worm gear 307, the bidirectional screw 305 is driven to rotate, realizing the automatic opening and closing of the clamping block 303. The worm gear transmission has self-locking properties, which can prevent the bidirectional screw 305 from rotating accidentally, ensuring that the brake 304 stably clamps the slide bar 102 and ensuring that the movable frame 201 is fixed and reliable.

[0022] Furthermore, a fixed frame 205 is fixedly connected to the top of the adjusting frame 202, and an auxiliary wheel 206 is slidably connected to one side of the top of the fixed frame 205. A drive wheel 209 is rotatably connected to the outer end of the fixed frame 205 at the bottom of the auxiliary wheel 206. A bearing plate 208 and a positioning cylinder 210 are respectively provided on the outer end of the fixed frame 205. The fixed frame 205 on the adjusting frame 202 provides installation support for the auxiliary wheel 206 and the drive wheel 209. The drive wheel 209 and the auxiliary wheel 206 cooperate to clamp the prestressed pipe. When the drive wheel 209 rotates, it drives the pipe to move, realizing the pipe insertion or extraction action. The auxiliary wheel 206 enhances the pipe clamping stability and prevents slippage. The bearing plate 208 can support the pipe by installation, and the positioning cylinder 210 facilitates the pipe to be inserted into the box girder.

[0023] Furthermore, an electric telescopic rod 207 is fixedly connected to one side of the top of the fixing frame 205. The output end of the electric telescopic rod 207 is fixedly connected to the top of the auxiliary wheel 206. The electric telescopic rod 207 on the fixing frame 205 can push the auxiliary wheel 206 to move up and down, adjust the distance between the auxiliary wheel 206 and the driving wheel 209, adapt to prestressed pipes of different diameters, ensure appropriate clamping force, and avoid damage to the pipe or loosening of the clamp.

[0024] Furthermore, a second drive motor 211 is fixedly connected to one side of the fixed frame 205. The output end of the second drive motor 211 is connected to the drive wheel 209 for transmission. The second drive motor 211 provides power to the drive wheel 209, drives the drive wheel 209 to rotate and moves the prestressed pipe, realizes automated pipe insertion or removal, replaces manual operation, and improves work efficiency. The motor drive can accurately control the pipe movement speed and ensure construction quality.

[0025] Furthermore, a reducer 203 is fixedly connected to one side of the movable frame 201. The output end of the reducer 203 is connected to the central shaft of the adjusting frame 202. A third drive motor 204 is installed at one end of the reducer 203. The output end of the third drive motor 204 is connected to the input end of the reducer 203. After the third drive motor 204 is reduced in speed and torque increased by the reducer 203, it drives the adjusting frame 202 to rotate. The central shaft of the adjusting frame 202 is located at the center of the movable frame 201 and is rotatably connected to the movable frame 201. This allows for precise adjustment of the angle of the fixed frame 205 and the pipe, adapting to the tilt angle requirements of the prestressed pipe of the box girder, ensuring accurate pipe insertion and extraction directions, and avoiding pipe bending or jamming.

[0026] Furthermore, a pair of casters 103 are fixedly installed on both sides of the bottom end of the mounting frame 101, and a double-drum winch 104 is fixedly installed on the top end of the mounting frame 101. The two hooks of the double-drum winch 104 are fixedly connected to the upper sides of the mobile frame 201 by cables. The double-drum winch 104 on the mounting frame 101 pulls the mobile frame 201 along the slide bar 102 by cables, providing stable power for the mobile frame 201 and realizing the position adjustment of the pipe insertion and extraction mechanism 2. The double-drum design makes the mobile frame 201 subjected to balanced force, move smoothly, and ensure operational safety.

[0027] Specifically, the working principle of this type of box girder prestressed duct insertion and extraction machine is as follows: In use, the equipment is first moved to the box girder construction position via the universal wheels 103 at the bottom of the mounting frame 101 of the support mechanism 1, and then fixed using the brake feet on the universal wheels 103. The double-drum winch 104 at the top of the mounting frame 101 is then started, pulling the moving frame 201 along the slide bar 102 to the approximate working height via a cable. Subsequently, the first drive motor 302 at the upper end of the movable frame 301 in the self-locking mechanism 3 is started, its output end driving the worm gear 308 to rotate. The worm gear 308 meshes with the worm wheel 307 at the center of the double-acting screw 305, driving the double-acting screw 305 to rotate. This causes the sliders 306 at both ends to move towards the clamping blocks 303 and the brake 304, clamping the slide bar 102 and fixing the position of the moving frame 201. Then, the first drive motor 302 on one side of the moving frame 201 is started. The three drive motors 204, after being reduced in speed and torque by the reducer 203, drive the adjusting frame 202 to rotate. The angle of the fixed frame 205 is adjusted to match the prestressed duct of the box girder. One end of the prestressed duct is passed through the positioning cylinder 210 and placed on the drive wheel 209. The electric telescopic rod 207 on the fixed frame 205 is activated, pushing the auxiliary wheel 206 down to cooperate with the drive wheel 209 to clamp the duct. The bearing plate 208 supports the middle section of the duct. The second drive motor 211 is activated to drive the drive wheel 209 to rotate, moving the duct into the box girder to achieve duct insertion. When pulling the duct, the second drive motor 211 is activated in reverse. If the working position needs to be adjusted, the first drive motor 302 is activated in reverse to release the brake 304. The height of the moving frame 201 is adjusted by the double drum winch 104 and then locked again. The whole process achieves precise and efficient insertion and extraction of the prestressed duct.

[0028] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pipe threading and pulling machine for prestressed ducts in box girders, characterized in that, It includes a support mechanism (1) and a tube insertion and extraction mechanism (2). The support mechanism (1) includes a mounting frame (101), and slide rods (102) are fixedly installed at both ends of the mounting frame (101). The tube insertion and extraction mechanism (2) includes a movable frame (201), and both ends of the movable frame (201) are slidably connected to the slide rods (102). An adjustment frame (202) is rotatably connected inside the movable frame (201). It also includes a self-locking mechanism (3), which includes two movable frames (301) located at both ends of the movable frame (201). A pair of clamping blocks (303) are slidably installed at the bottom of each movable frame (301). A brake (304) is fixedly installed on the facing surface of each pair of clamping blocks (303). The two clamping blocks (303) drive the brake (304) to move towards each other along the movable frame (301) to clamp the sliding rod (102).

2. The prestressed duct threading and pulling machine for box girders according to claim 1, characterized in that, The movable frame (301) is equipped with a rotatable bidirectional screw (305) inside. Both ends of the bidirectional screw (305) are threadedly connected to sliders (306). The bottom end of the slider (306) is fixedly connected to the top end of the clamping block (303).

3. The prestressed duct threading and pulling machine for box girders according to claim 2, characterized in that, A worm gear (307) is sleeved at the center of the bidirectional screw (305). A worm (308) is meshed at the outer end of the worm gear (307). The worm (308) is rotatably connected to the movable frame (301). The worm gear (307) and the worm (308) are meshed together. A first drive motor (302) is fixedly connected to the top of the movable frame (301). The output end of the first drive motor (302) is connected to the worm (308) in a transmission connection.

4. The prestressed duct threading and pulling machine for box girders according to claim 1, characterized in that, The top of the adjusting frame (202) is fixedly connected to a fixed frame (205), and an auxiliary wheel (206) is slidably connected to one side of the top of the fixed frame (205). The outer end of the fixed frame (205) is rotatably connected to a drive wheel (209) at the bottom of the auxiliary wheel (206). The outer end of the fixed frame (205) is respectively provided with a bearing plate (208) and a positioning cylinder (210).

5. A prestressed duct threading and pulling machine for box girders according to claim 4, characterized in that, An electric telescopic rod (207) is fixedly connected to one side of the top of the fixed frame (205), and the output end of the electric telescopic rod (207) is fixedly connected to the top of the auxiliary wheel (206).

6. A prestressed duct threading and pulling machine for box girders according to claim 5, characterized in that, A second drive motor (211) is fixedly connected to one side of the fixed frame (205), and the output end of the second drive motor (211) is connected to the drive wheel (209) for transmission.

7. A prestressed duct threading and pulling machine for box girders according to claim 1, characterized in that, A speed reducer (203) is fixedly connected to one side of the movable frame (201). The output end of the speed reducer (203) is connected to the central shaft of the adjusting frame (202) via a transmission connection. A third drive motor (204) is installed at one end of the speed reducer (203). The output end of the third drive motor (204) is connected to the input end of the speed reducer (203) via a transmission connection.

8. A prestressed duct threading and pulling machine for box girders according to claim 1, characterized in that, A pair of casters (103) are fixedly installed on both sides of the bottom end of the mounting frame (101), and a double-drum winch (104) is fixedly installed on the top end of the mounting frame (101). The two hooks of the double-drum winch (104) are fixedly connected to the upper sides of the mobile frame (201) by cables respectively.

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