Pipe drawing wrench capable of being conveniently connected with pipelines with different diameters

Abstract

The utility model discloses a pipe drawing wrench convenient to connect with pipelines of different diameters, which comprises a rotating head, a travelling crane, a spline shaft and a connecting rod, the rotating head penetrates through the travelling crane and is rotatably connected with the travelling crane, a central spline of the rotating head is connected with the spline shaft, and a driving component is fixedly mounted on the upper surface of the right side of the travelling crane. The driving assembly is connected with the rotating head; a plurality of first double-acting hydraulic cylinders are fixedly installed in the left side of the rotating head, the ends, away from the rotating head, of the first double-acting hydraulic cylinders are rotationally connected with one ends of connecting rods, and clamp blocks are fixedly installed on the outer sides of the connecting rods. According to the technical scheme, the pipe drawing pliers can be conveniently adjusted according to actual use requirements, the application range of the pipe drawing pliers is widened, the pipe drawing pliers are more practical to use, meanwhile, the pressure intensity of the pliers block on the connecting rod on the cast pipe is reduced, the problem that the cast pipe is prone to being extruded and deformed in the pipe drawing process is solved, and the pipe drawing efficiency is improved. And the quality of finished products is improved.

Description

Technical Field

[0001] This utility model relates to the field of pipe puller technology, specifically a pipe puller that is easy to connect to pipes of different diameters. Background Technology

[0002] Centrifugal casting has advantages such as no need for a core and high casting density. Its principle is to inject molten liquid metal into a high-speed rotating mold. While the liquid metal is in centrifugal motion, it is gradually cooled down, allowing the metal to cool and solidify. In order to pull out the formed cast tube, tube pullers are needed.

[0003] Existing pipe pullers are typically matched with molds of specific sizes, which limits their use. They are only suitable for pulling out pipes of specific sizes, requiring the use of different models of pipe pullers when processing pipes of different sizes. This leads to a surge in equipment costs and significantly increases production costs. Furthermore, existing pipe pullers are usually limited by their movable structure, relying on a single set of drive arms to push the jaws to clamp the pipe, resulting in high pressure on the pipe and making it prone to deformation during pipe pulling operations. Therefore, we propose a pipe puller that is easy to connect with pipes of different diameters. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a pipe puller that is easy to connect with pipes of different diameters. It can be applied to smaller cast iron pipes. The following technical solution makes it easy to adjust the pipe puller according to actual use needs, which improves the applicability of the pipe puller and makes it more practical to use. At the same time, it reduces the pressure of the clamp blocks on the connecting rod on the cast iron pipe, avoids the problem of easy compression and deformation of the cast iron pipe during the pipe pulling process, improves the quality of the finished product, and can effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pipe puller that is easy to connect with pipes of different diameters, comprising a rotating head, a traveling trolley, a splined shaft and a connecting rod, wherein the rotating head passes through the traveling trolley and is rotatably connected thereto, the center spline of the rotating head is connected to the splined shaft, and a drive assembly is fixedly installed on the upper right surface of the traveling trolley, the drive assembly being connected to the rotating head;

[0006] Multiple first double-acting hydraulic cylinders are fixedly installed inside the left side of the rotating head. The end of the first double-acting hydraulic cylinder away from the rotating head is rotatably connected to one end of the connecting rod. A clamp block is fixedly installed on the outside of the connecting rod. Multiple fixed support rods are evenly rotatably connected to the inside of the left end of the connecting rod. A connecting plate is welded and fixedly installed on the outside of the spline shaft. The other end of the fixed support rod is connected to the connecting plate. A movable support is installed on the inside of the left end of the connecting rod. The movable support is connected to the connecting plate.

[0007] Furthermore, a baffle is fixedly installed at the end of the spline shaft away from the connecting rod, and a second double-acting hydraulic cylinder is fixedly installed on the side of the rotating head away from the first double-acting hydraulic cylinder, with one end of the second double-acting hydraulic cylinder connected to the baffle.

[0008] Furthermore, the connecting plate includes a turntable and grooves. The surface of the turntable is evenly provided with multiple grooves, and the other end of the fixed support rod extends into the interior of the corresponding groove and is rotatably connected to the turntable.

[0009] Furthermore, the movable support includes a first movable support rod, a second movable support rod, a slide groove, and a limiting block. The slide groove is formed inside the first movable support rod. One end of the first movable support rod extends into the corresponding groove and is rotatably connected to the turntable. One end of the second movable support rod is rotatably connected to the connecting rod, and the second movable support rod extends into the slide groove and is fixedly connected to the limiting block. The limiting block is slidably installed inside the slide groove.

[0010] Furthermore, the fixed support rod is installed on the splined shaft near the rotating head, and the length of the fixed support rod is the same as the shortest length of the movable support. The distance between the fixed support rod and the rotating head is greater than the stroke of the second double-acting hydraulic cylinder.

[0011] Furthermore, the drive assembly includes a belt and a motor bracket mounted on the upper right side of the vehicle. A motor is mounted on the motor bracket, and the output shaft of the motor is connected to a first pulley via a coupling. A second pulley is mounted on the rotating head. The first pulley and the second pulley are connected by belt drive. The input end of the motor is electrically connected to the output end of an external controller.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This pipe puller, which is easy to connect with pipes of different diameters, has the following advantages:

[0013] 1. The device is equipped with a first double-acting hydraulic cylinder and a connecting rod. The first double-acting hydraulic cylinder pulls one end of the connecting rod close to the spline shaft, while the second double-acting hydraulic cylinder pushes the spline shaft. This causes the spline shaft to pull the connecting rod through a fixed support rod and a movable support, making the center line of the connecting rod parallel to the spline shaft. This changes the distance between the connecting rod and the clamps on the connecting rod and the spline shaft, making the pipe puller suitable for smaller cast pipes. Through the above steps, the pipe puller can be adjusted according to actual usage needs, improving its applicability and making it more practical to use.

[0014] 2. Equipped with a fixed support rod and a movable support, when the second double-operating hydraulic cylinder pushes the spline shaft, the spline shaft pulls the connecting rod to rotate via the fixed support rod. Since the movable support is farther from the rotation center of the connecting rod than the fixed support rod, the movable support needs to be extended to compensate. Through the above structure, movable supports can be installed at different positions on the spline shaft to support the connecting rod. When the movable support is retracted to its shortest state, it cooperates with the fixed support rod to support the connecting rod, improving the support strength of the connecting rod and reducing the pressure of the clamps on the connecting rod on the cast pipe. This avoids the problem of easily squeezing and deforming the cast pipe during the pipe pulling process, thus improving the quality of the finished product. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the right-side cross-sectional structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the main cross-sectional structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the left-side cross-sectional structure of this utility model;

[0018] Figure 4 This is a three-dimensional cross-sectional structural diagram of the movable support of this utility model.

[0019] In the diagram: 1 Rotary head, 2 Crane, 3 Splined shaft, 4 Motor, 5 Belt, 6 First double-acting hydraulic cylinder, 7 Connecting rod, 8 Clamp block, 9 Fixed support rod, 10 Movable support, 11 Turntable, 12 Groove, 13 Baffle, 14 Second double-acting hydraulic cylinder, 15 First movable support rod, 16 Second movable support rod, 17 Slide groove, 18 Limiting block, 19 First pulley, 20 Second pulley. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This embodiment provides a technical solution: a pipe puller that is easy to connect with pipes of different diameters, including a rotating head 1, a traveling trolley 2, a splined shaft 3 and a connecting rod 7. The rotating head 1 passes through the traveling trolley 2 and is rotatably connected to it. The center spline of the rotating head 1 is connected to the splined shaft 3. A drive assembly is fixedly installed on the upper right surface of the traveling trolley 2 and is connected to the rotating head 1.

[0022] Multiple first double-acting hydraulic cylinders 6 are fixedly installed inside the left side of the rotating head 1. The end of the first double-acting hydraulic cylinder 6 away from the rotating head 1 is rotatably connected to one end of the connecting rod 7. A clamp block 8 is fixedly installed on the outside of the connecting rod 7. Multiple fixed support rods 9 are evenly rotatably connected to the inside of the left end of the connecting rod 7. A connecting plate is welded and fixedly installed on the outside of the spline shaft 3. The other end of the fixed support rod 9 is connected to the connecting plate. A movable support 10 is installed on the inside of the left end of the connecting rod 7. The movable support 10 is connected to the connecting plate.

[0023] A baffle 13 is fixedly installed at the end of the spline shaft 3 away from the connecting rod 7. A second double-acting hydraulic cylinder 14 is fixedly installed on the side of the rotating head 1 away from the first double-acting hydraulic cylinder 6, and one end of the second double-acting hydraulic cylinder 14 is connected to the baffle 13. The second double-acting hydraulic cylinder 14 pushes the spline shaft 3 through the baffle 13, causing the spline shaft 3 to slide along the rotating head 1.

[0024] By adopting the above technical solution, when in use, the second double-acting hydraulic cylinder 14 pulls the spline shaft 3, and when the spline shaft 3 slides along the rotating head 1, it pulls the connecting rod 7 to rotate through the fixed support rod 9 and the movable support 10.

[0025] The connecting plate includes a turntable 11 and grooves 12. Multiple grooves 12 are evenly provided on the surface of the turntable 11. The other end of the fixed support rod 9 extends into the interior of the corresponding groove 12 and is rotatably connected to the turntable 11.

[0026] By adopting the above technical solution, it is easy for the fixed support rod and the first movable support rod to extend into the groove and rotate with the turntable, and it is easy for the spline shaft 3 to pull or push the connecting rod 7 to rotate through the fixed support rod 9. At the same time, the fixed support rod 9 rotates with the displacement of the connecting rod 7.

[0027] The movable support 10 includes a first movable support rod 15, a second movable support rod 16, a slide groove 17, and a limiting block 18. The slide groove 17 is formed inside the first movable support rod 15. One end of the first movable support rod 15 extends into the corresponding groove 12 and is rotatably connected to the turntable 11. One end of the second movable support rod 16 is rotatably connected to the connecting rod 7, and the second movable support rod 16 extends into the slide groove 17 and is fixedly connected to the limiting block 18. The limiting block 18 is slidably installed inside the slide groove 17.

[0028] By adopting the above technical solution, when the spline shaft 3 pulls the connecting rod 7 to retract via the fixed support rod 9, the second movable support rod 16 slides within the first movable support rod 15, thereby extending the length of the movable support 10 to accommodate the retraction of the connecting rod 7. The limiting block 18 slides within the slide groove 17, and the sliding distance of the limiting block 18 is limited, preventing the first movable support rod 15 and the second movable support rod 16 from completely separating. Simultaneously, through the sliding connection between the first movable support rod 15 and the second movable support rod 16, the movable support 10 rotates with the connecting rod 7 and provides compensation.

[0029] The fixed support rod 9 is installed on the splined shaft 3 near the rotating head 1, and the length of the fixed support rod 9 is the same as the shortest length of the movable support 10. The distance between the fixed support rod 9 and the rotating head 1 is greater than the stroke of the second double-acting hydraulic cylinder 14. This prevents the fixed support rod 9 from colliding with the rotating head 1 when the second double-acting hydraulic cylinder 14 pushes the splined shaft 3 to slide along the rotating head 1.

[0030] By adopting the above technical solution, when the connecting rod 7 is parallel to the spline shaft 3, the spline shaft 3 simultaneously supports the connecting rod 7 through multiple fixed support rods 9 and multiple movable supporters 10.

[0031] The drive assembly includes a belt 5 and a motor bracket mounted on the upper right side of the crane 2. A motor 4 is mounted on the motor bracket. The output shaft of the motor 4 is connected to a first pulley 19 via a coupling. A second pulley 20 is mounted on the rotating head 1. The first pulley 19 and the second pulley 20 are connected via a belt 5. The input end of the motor 4 is electrically connected to the output end of an external controller. The external controller controls the operation of the motor 4, which drives the first pulley 19 to rotate. Under the action of the first pulley 19, the second pulley 20, and the belt 5, the rotation of the first pulley 19 drives the second pulley 20 and the rotating head 1 to rotate.

[0032] The working principle of the pipe puller provided by this utility model, which facilitates connection with pipes of different diameters, is as follows: During use, according to the size of the cast pipe, the first double-acting hydraulic cylinder 6 pushes the connecting rods 7, moving one end of each connecting rod 7 to a designated position. Simultaneously, the second double-acting hydraulic cylinder 14 pushes the spline shaft 3 through the baffle 13. The spline shaft 3 rotates along the rotating head 1, and the spline shaft 3 pulls the connecting rods 7 through the fixed support rod 9, making the centerline of the connecting rods 7 parallel to the spline shaft 3. During this process, the second movable support rod 16 slides within the slide groove 17 through the limiting block 18, causing a change in the length of the movable support 10. Therefore, the connecting rod 7 is not jammed by the fixed support rod 9 and the movable support 10. Subsequently, the second double-acting hydraulic cylinder 14 continues to pull the spline shaft 3. Similarly, the end of the connecting rod 7 away from the rotating head 1 retracts, and the traveling trolley 2 pushes the connecting rod 7 into the inside of the casting tube. Similarly, the spline shaft 3 pushes the connecting rod 7 outward through the fixed support rod 9 and the movable support 10, and makes the clamp 8 on the outside of the connecting rod 7 stick to the inner wall of the casting tube. The motor 4 drives the rotating head 1 to rotate through the first pulley 19, the second pulley 20 and the belt 5. At the same time, the traveling trolley 2 drives one end of the rotating head 1, so that the casting tube outside the connecting rod 7 is separated from the mold.

[0033] It is worth noting that in this embodiment, the core chip of the external controller is an STC microcontroller, specifically the STC15W204S, while motor 4 can be freely configured according to the actual application scenario. The external controller controls the operation of motor 4 using methods commonly used in the prior art, and the content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0034] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A pipe puller that is easy to connect to pipes of different diameters, comprising a rotating head (1), a traveling trolley (2), a splined shaft (3), and a connecting rod (7), characterized in that: The rotating head (1) passes through the trolley (2) and is rotatably connected to it. The center spline of the rotating head (1) is connected to a spline shaft (3). A drive assembly is fixedly installed on the upper right side surface of the trolley (2). The drive assembly is connected to the rotating head (1). Multiple first double-acting hydraulic cylinders (6) are fixedly installed inside the left side of the rotating head (1). The end of the first double-acting hydraulic cylinder (6) away from the rotating head (1) is rotatably connected to one end of the connecting rod (7). A clamp block (8) is fixedly installed on the outside of the connecting rod (7). Multiple fixed support rods (9) are evenly rotatably connected to the inside of the left end of the connecting rod (7). A connecting plate is welded and fixedly installed on the outside of the spline shaft (3). The other end of the fixed support rod (9) is connected to the connecting plate. A movable support (10) is installed on the inside of the left end of the connecting rod (7). The movable support (10) is connected to the connecting plate.

2. The pipe puller according to claim 1, characterized in that: A baffle (13) is fixedly installed at the end of the spline shaft (3) away from the connecting rod (7), and a second double-acting hydraulic cylinder (14) is fixedly installed on the side of the rotating head (1) away from the first double-acting hydraulic cylinder (6), and one end of the second double-acting hydraulic cylinder (14) is connected to the baffle (13).

3. A pipe puller according to claim 1, characterized in that: The connecting plate includes a turntable (11) and a groove (12). The surface of the turntable (11) is evenly provided with a plurality of grooves (12). The other end of the fixed support rod (9) extends into the interior of the corresponding groove (12) and is rotatably connected to the turntable (11).

4. A pipe puller according to claim 1, characterized in that: The movable support (10) includes a first movable support rod (15), a second movable support rod (16), a slide groove (17), and a limiting block (18). The slide groove (17) is opened inside the first movable support rod (15). One end of the first movable support rod (15) extends into the corresponding groove (12) and is rotatably connected to the turntable (11). One end of the second movable support rod (16) is rotatably connected to the connecting rod (7), and the second movable support rod (16) extends into the slide groove (17) and is fixedly connected to the limiting block (18). The limiting block (18) is slidably installed inside the slide groove (17).

5. A pipe puller according to claim 4, characterized in that: The fixed support rod (9) is installed on the spline shaft (3) on the side near the rotating head (1), and the length of the fixed support rod (9) is the same as the shortest length of the movable support (10). The distance between the fixed support rod (9) and the rotating head (1) is greater than the stroke of the second double-acting hydraulic cylinder (14).

6. A pipe puller according to claim 1, characterized in that: The drive assembly includes a belt (5) and a motor bracket mounted on the upper right side of the trolley (2). A motor (4) is mounted on the motor bracket. The output shaft of the motor (4) is connected to a first pulley (19) via a coupling. A second pulley (20) is mounted on the rotating head (1). The first pulley (19) and the second pulley (20) are connected by a belt (5) for transmission. The input end of the motor (4) is electrically connected to the output end of an external controller.

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