A pipe expander for a jack guide tube

Abstract

The utility model discloses an expand pipe device of jack guide pipe, including expansion rod, expansion sleeve, sleeve and telescopic cylinder, expansion rod includes connecting section, spacing section and conical section in proper order, and connecting section is coaxial with telescopic part and connects, and expansion sleeve is sleeved in the conical section of expansion rod, and sleeve is sleeved in the outside of spacing section, and one end is fixedly connected with fixed part, and the other end is fixedly connected with one end of expansion sleeve, and the other end of expansion sleeve is equipped with the step of being suitable for the inner wall of guide pipe, wherein, the inner wall of expansion sleeve is equipped with the conical cavity of being suitable for conical section, and expansion sleeve is evenly arranged with three or more than three axial through grooves that pass through its lateral wall from the end of step, and spacing section is equipped with spacing step that is matched with one of sleeve inner wall or expansion sleeve end part, is used for preventing spacing section to enter the inside of expansion sleeve. The utility model discloses an expand pipe device of jack guide pipe can make the depth of expansion rod jacking controllable, and the sleeve structure and the connection relation are simple, and the expand pipe device is convenient to dismount.

Description

Technical Field

[0001] This utility model relates to the field of tube expansion technology, and in particular to a tube expansion device for a jack guide tube. Background Technology

[0002] Currently, the equipment used for loading large marine structures is large in tonnage, involves numerous steel strands, and is installed horizontally. To prevent the steel strands from sagging under gravity and to avoid cylinder jamming, jacks typically have guide tubes inside to allow the steel strands to pass smoothly through. Traditional welding methods for fixed connections result in the guide tube being completely fixed, leading to relatively large processing errors and poor fit between the guide tube and related components. To solve these problems, a method is adopted where the outer wall of the guide tube end is machined into a stepped shape and fitted with a flange for limiting connection, replacing the defective welding method. This requires expanding the end of the guide tube.

[0003] Existing tube expansion devices generally include a pin, a rod, an expansion head, a fixing sleeve, and a drive mechanism. The drive mechanism drives the rod to push the pin into the expansion head, causing the expansion head to expand inside the guide tube, thereby machining the outer wall of the guide tube into a stepped shape. For example, Chinese patent CN114406113A discloses an oil-free, multi-lobed tube expander, tube expansion equipment, and a heat exchange tube connection method. The expander includes a pin, a multi-lobed expansion head, a fixing sleeve, a fixing arm, a pin, an O-ring, a handle, a rod, a positioning screw, and a fixing seat. The pin is located at the axis of the multi-lobed expansion head and has a conical structure. An O-ring is provided at the outer end of the multi-lobed expansion head to fasten several multi-lobed expansion heads towards the axis, serving to reset the driving force. The fixing sleeve in the prior art requires the fixing arm for installation, resulting in a complex installation structure. Furthermore, the depth of the rod's insertion is uncontrollable, and the working status of the rod cannot be observed. Especially for machining various step sizes, its processing efficiency and accuracy cannot be guaranteed. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an expansion device for a jack guide tube, aiming to solve the problems of complex installation structure of the fixed sleeve, uncontrollable jacking depth, inability to observe the working status of the jacking rod, and inability to guarantee processing efficiency and accuracy in the existing technology.

[0005] The present invention achieves the above objectives by adopting the following technical solution:

[0006] An expansion device for a jack guide tube includes an expansion rod, an expansion sleeve, a sleeve, and a telescopic cylinder. The telescopic cylinder includes a fixed part and a telescopic part. The expansion rod sequentially includes a connecting section, a limiting section, and a conical section. The connecting section is coaxially connected to the telescopic part, and the expansion sleeve is fitted onto the conical section of the expansion rod. The sleeve is fitted onto the outside of the limiting section, with one end fixedly connected to the fixed part and the other end fixedly connected to one end of the expansion sleeve. The other end of the expansion sleeve penetrates the sleeve and has a step adapted to the inner wall of the guide tube. The inner wall of the expansion sleeve also has a conical cavity adapted to the conical section. The expansion sleeve has three or more axial through grooves evenly distributed from the end of the step, penetrating its side wall. The length of the through groove is greater than the length of the conical cavity and less than the length of the expansion sleeve. The limiting section has a limiting step that mates with either the inner wall of the sleeve or the end of the expansion sleeve to prevent the limiting section from entering the interior of the expansion sleeve.

[0007] The working principle of this technical solution is as follows: when the telescopic part extends relative to the fixed part, it pushes the tapered section of the expansion rod to move axially. The expansion sleeve, under the action of the sleeve, does not follow the telescopic part. During this process, the tapered section gradually moves towards the part with the smaller inner diameter of the tapered cavity. That is, the conical surface of the tapered section applies extrusion force to the inner wall of the tapered cavity of the expansion sleeve. The expansion sleeve expands along the through groove, causing the guide tube connected to the step at the end of the expansion sleeve to expand and form a step shape. After holding the pressure for a certain period, the telescopic part retracts, and the force exerted by the conical surface of the tapered section on the inner wall of the tapered cavity of the expansion sleeve gradually disappears. The expansion sleeve returns to its original shape, and the guide tube is removed, completing one tube expansion operation. In this technical solution, by adding a limiting step to the expansion rod, when the limiting step moves to its matching position, the telescopic part stops extending further, making the jacking depth of the expansion rod controllable. This maintains the consistency of the tube expansion size each time, improving processing efficiency and accuracy. At the same time, the sleeve structure and connection relationship are simple, facilitating the assembly and disassembly of the tube expansion device.

[0008] A further technical solution is that the outer wall of the sleeve is provided with a through observation window. This technical solution allows the observation window to view the extension position of the expansion rod, enabling timely detection of faults in components such as the expansion rod and telescopic parts.

[0009] A further technical solution is that the limiting step is an annular protrusion integrally formed with the expansion rod.

[0010] A further technical solution involves using a nut that is threadedly connected to the expansion rod as the limiting step. This solution employs an adjustable nut for limiting, allowing adjustment of the distance between the limiting step and the mating position, thereby meeting the processing requirements for different expansion tube sizes.

[0011] A further technical solution includes a locking screw, wherein the outer peripheral plane of the nut has a through threaded hole, and the locking screw engages with the threaded hole to tighten the expansion rod. This technical solution further secures the nut by drilling threaded holes in six planes of the nut and installing set screws.

[0012] A further technical solution is that the sleeve is a split structure in half along its axial direction and is fixed by screws; the end of the expansion sleeve connected to the sleeve is provided with an annular protrusion, and the sleeve is provided with an annular groove that matches the annular protrusion.

[0013] A further technical solution is that the sleeve and the fixing part are fixedly connected by a matching threaded structure.

[0014] A further technical solution is that the connecting section and the telescopic part are respectively provided with matching external threads and internal threads.

[0015] The beneficial effects of this utility model are:

[0016] This utility model provides an expansion device for a jack guide tube. By adding a limiting step to the expansion rod, when the limiting step moves to its mating position, the telescopic part stops extending further, making the jacking depth of the expansion rod controllable. This maintains consistency in the expansion size each time, improving processing efficiency and accuracy. Furthermore, the sleeve structure and connection relationship are simple, facilitating the assembly and disassembly of the expansion device. The extension position of the expansion rod can be observed through the observation window on the outer wall of the sleeve, allowing for timely detection of faults in components such as the expansion rod and telescopic part. The use of a limiting nut allows adjustment of the distance between the limiting step and its mating position, thus meeting the processing requirements of different expansion sizes. Attached Figure Description

[0017] Figure 1 See: A schematic diagram of the tube expansion device described in this utility model.

[0018] Figure 2 Here is a schematic diagram of the structure of the expansion rod described in this utility model.

[0019] Figure 3 The diagram shows the expansion rod structure with a limit nut as described in this utility model.

[0020] Figure 4 Here is a schematic diagram of the expansion sleeve described in this utility model.

[0021] Figure 5 Here is a schematic diagram of the structure of the sleeve described in this utility model.

[0022] In the picture:

[0023] 1. Expansion rod; 11. Conical section; 12. Limiting section; 13. Connecting section; 2. Expansion sleeve; 20. Through groove; 21. Conical cavity; 22. Step; 23. Annular protrusion; 3. Sleeve; 31. Internal thread section; 32. Limiting protrusion; 33. Annular groove; 4. Telescopic cylinder; 41. Fixing part; 42. Telescopic part; 5. Guide tube. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1 to 5 The present invention will be described in detail below with specific embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] like Figures 1 to 5 As shown, this embodiment provides an expansion device for a jack guide tube, including an expansion rod 1, an expansion sleeve 2, a sleeve 3, and a telescopic cylinder 4; the telescopic cylinder 4 includes a fixed part 41 and a telescopic part 42; the expansion rod 1 sequentially includes a connecting section 13, a limiting section 12, and a tapered section 11; the connecting section 13 is coaxially connected to the telescopic part 42, and the expansion sleeve 2 is sleeved on the tapered section 11 of the expansion rod 1; the sleeve 3 is sleeved outside the limiting section 12, and one end of it is fixedly connected to the fixed part 41, and the other end is fixedly connected to one end of the expansion sleeve 2; the expansion sleeve The other end of the expansion sleeve 2 passes through the sleeve 3 and is provided with a step 22 that is adapted to the inner wall of the guide tube 5; wherein, the inner wall of the expansion sleeve 2 is also provided with a conical cavity 21 that is adapted to the conical section 11, and the expansion sleeve 2 is provided with three or more axial through grooves 20 that penetrate its side wall evenly from the end of the step 22, the length of the through groove 20 is greater than the length of the conical cavity 21 and less than the length of the expansion sleeve 2; the limiting section 12 is provided with a limiting step that cooperates with one of the inner wall of the sleeve 3 or the end of the expansion sleeve 2, in order to prevent the limiting section 12 from entering the interior of the expansion sleeve 2.

[0026] Specifically, the telescopic cylinder 4 uses a jack, which hydraulically drives the telescopic part 42 to reciprocate relative to the fixed part 41. The connecting section 13 has an external thread structure, and the end of the telescopic part 42 has a matching internal thread structure. The expansion rod 1 is fixedly connected to the telescopic part 42 through the above-mentioned thread structure. The sleeve 3 is specifically a split structure milled along its axial direction. The end of the sleeve 3 connected to the expansion sleeve 2 has an annular groove 33, and the end of the expansion sleeve 2 has a matching annular protrusion 23. After the expansion sleeve 2 is installed, the split sleeve 3 is fixedly connected by screws. The spliced ​​sleeve 3 has an internal thread section 31 at one end, and the fixed part 41 is... The sleeve 3 is provided with an external thread section to achieve a fixed connection between the sleeve 3 and the fixing part 41. The expansion sleeve 2 is specifically supported by steel with good resilience. Six axial through grooves 20 are evenly opened from the end of its step 22, penetrating its side wall. The through grooves 20 are specifically arranged along the axial direction of the expansion sleeve 2 and penetrate the side wall of the expansion sleeve 2. They open at one end of the step 22 and extend to the space between the annular protrusion 23 and the conical cavity 21 at the other end. The limiting step of the limiting section 12 is specifically integrally formed with the expansion rod 1. An annular protrusion is formed on the outer wall of the expansion rod 1 for cooperating with the limiting protrusion 32 on the inner wall of the sleeve 3. The limiting protrusion 32 is the outer wall of the annular groove 33.

[0027] In this embodiment, the tube expansion device is fixedly connected to the fixed part 41 and the expansion sleeve 2 at both ends of the sleeve 3, forming a reaction frame. When the telescopic part 42 extends relative to the fixed part 41, it pushes the conical section 11 of the expansion rod 1 to move along its axial direction. Under the action of the sleeve 3, the expansion sleeve 2 does not follow the telescopic part 42. During the extension of the telescopic part 42, the conical section 11 gradually moves towards the part with the smaller inner diameter of the conical cavity 21. That is, the conical surface of the conical section 11 applies a compressive force to the inner wall of the conical cavity 21. Under the action of the internal compressive force, the expansion sleeve 2 expands along the through groove 20, causing the guide tube 5 connected to the step 22 at the end of the expansion sleeve 2 to expand and form a step shape. After holding the pressure for a certain period of time, the telescopic part 42 retracts and returns to its original position. The force of the conical surface of the conical section 11 acting on the inner wall of the conical cavity 21 gradually decreases to zero, the expansion sleeve 2 returns to its original state, and the guide tube 5 is removed to complete one tube expansion operation. This embodiment adds a limiting step 12 to the expansion rod 1. When the limiting step 12 moves to the position that matches it, the telescopic part 42 no longer extends, so that the pushing depth of the expansion rod 1 is controllable, thereby maintaining the consistency of the tube expansion size each time, which can improve processing efficiency and processing accuracy. At the same time, the sleeve 3 has a simple structure and connection relationship, which facilitates the disassembly and assembly of the tube expansion device.

[0028] Another implementation method, based on the above implementation method, such as... Figure 3 As shown, the limiting step of the limiting section 12 can also be a limiting nut that is threadedly connected to the expansion rod 1. Specifically, according to the expansion tube processing requirements, the position of the limiting nut on the expansion rod 1 can be adjusted by threading, that is, the distance between the limiting step and the mating position can be adjusted, thereby meeting the processing requirements of different expansion tube sizes.

[0029] In another embodiment, based on the above embodiment, a locking screw is also included. The outer peripheral plane of the limiting nut is provided with a through threaded hole. The locking screw cooperates with the threaded hole and tightens the expansion rod 2. By drilling a threaded hole on the outer peripheral plane of the limiting nut and installing a set screw, the limiting nut is further fixed.

[0030] In another embodiment, based on the above embodiment, the outer wall of the sleeve 3 is provided with a through observation window 30. The extension position of the expansion rod 1 can be viewed through the observation window 30, and faults of components such as the expansion rod 1 and the telescopic part 42 can be detected in time.

[0031] The above embodiments exemplify the specific driving method of the telescopic cylinder 4, the specific connection method between the expansion rod 1 and the telescopic part 42, the specific structure of the sleeve 3 and the connection method at both ends, the specific number of through grooves 20, and the specific mating position of the limiting section 12. In other embodiments or practical applications, other structures or connection methods can be used instead. For example, the telescopic cylinder 4 can also use air pressure to drive the telescopic part 42 to perform axial reciprocating motion relative to the fixed part 41; the expansion rod 1 can also be fixedly connected to the telescopic part 42 by integral molding or welding; the sleeve 3 can also be an integral structure, and both ends can be fixedly connected to the fixed part 41 and the expansion sleeve 2 respectively by the above-mentioned fixed connection method; the more through grooves 20 there are, the more uniform the outer diameter roundness of the step at the end of the processing guide tube 5 will be. The specific setting can be determined according to the requirements of tube expansion processing, and is not limited here. In addition, an arc-shaped structure with an outer diameter larger than the through groove spacing can be opened at the end of the through groove 20 near the sleeve 3, which makes it easier for the expansion sleeve 2 to return to its original shape after the telescopic part 42 retracts; the end face of the end where the expansion sleeve 2 is connected to the sleeve 3 can also cooperate with the limiting section 12.

[0032] This utility model provides an expansion device for a jack guide tube. By adding a limiting step 12 to the expansion rod 1, when the limiting step 12 moves to the corresponding position, the telescopic part 42 stops extending, making the jacking depth of the expansion rod 1 controllable. This maintains the consistency of the expansion size each time, improving processing efficiency and accuracy. At the same time, the sleeve 3 has a simple structure and connection relationship, facilitating the disassembly and assembly of the expansion device. Furthermore, the extension position of the expansion rod 1 can be viewed through the observation window 30, enabling timely detection of faults in components such as the expansion rod 1 and the telescopic part 42.

Claims

1. A tube expansion device for a jack guide tube, characterized in that, Includes expansion rod, expansion sleeve, sleeve and telescopic cylinder; The telescopic cylinder includes a fixed part and a telescopic part; the expansion rod includes a connecting section, a limiting section and a conical section in sequence. The connecting section is coaxially connected to the telescopic part, and the expansion sleeve is fitted onto the tapered section of the expansion rod; the sleeve is fitted onto the outside of the limiting section, and one end of it is fixedly connected to the fixing part, and the other end is fixedly connected to one end of the expansion sleeve; the other end of the expansion sleeve passes through the sleeve and is provided with a step that matches the inner wall of the guide tube. The inner wall of the expansion sleeve is provided with a conical cavity adapted to the conical section. The expansion sleeve is provided with three or more axial through grooves that penetrate its side wall evenly from the end of the step. The length of the through groove is greater than the length of the conical cavity and less than the length of the expansion sleeve. The limiting section is provided with a limiting step that cooperates with one of the inner wall of the sleeve or the end of the expansion sleeve to prevent the limiting section from entering the interior of the expansion sleeve.

2. The expansion device for a jack guide tube according to claim 1, characterized in that, The outer wall of the sleeve is provided with a through observation window.

3. The expansion device for a jack guide tube according to claim 1, characterized in that, The limiting step is an annular protrusion integrally formed with the expansion rod.

4. The expansion device for a jack guide tube according to claim 1, characterized in that, The limiting step is a nut that is threadedly connected to the expansion rod.

5. The expansion device for a jack guide tube according to claim 4, characterized in that, It also includes a locking screw, wherein the outer peripheral plane of the nut is provided with a through threaded hole, and the locking screw engages with the threaded hole and presses against the expansion rod.

6. The expansion device for a jack guide tube according to claim 1, characterized in that, The sleeve is a split structure in half along its axial direction and is fixed by screws; the end of the expansion sleeve connected to the sleeve is provided with an annular protrusion, and the sleeve is provided with an annular groove that matches the annular protrusion.

7. The expansion device for a jack guide tube according to claim 1, characterized in that, The sleeve and the fixing part are fixedly connected by a matching threaded structure.

8. The expansion device for a jack guide tube according to claim 1, characterized in that, The connecting section and the telescopic part are respectively provided with matching external threads and internal threads.

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