A flange expansion device for flange maintenance

Abstract

This utility model relates to the field of flange sealing gaskets and flange connection valve maintenance technology, specifically disclosing a flange expansion device for flange maintenance, including an expansion base assembly, which includes an expansion propulsion assembly, and an expansion locking assembly provided on one side of the expansion base assembly and the expansion propulsion assembly; the expansion base assembly includes a base platform; the expansion propulsion assembly includes a threaded sleeve and a propulsion rod; the expansion locking assembly includes an extension plate and a locking rod. This solution achieves efficient and stable expansion of the flange gap through a symmetrically designed expansion head and a precision propulsion structure. The expansion head adopts a symmetrical distribution design, and its tip can be easily inserted into the flange gap after the screws are removed. The bent structure slides along the inclined surface during expansion, significantly reducing expansion resistance. The propulsion rod, through the precise cooperation between the threaded sleeve and the base platform, generates a stable linear propulsion force under wrench operation, ensuring that the expansion head expands synchronously.

Description

Technical Field

[0001] This utility model relates to the field of flange sealing gaskets and flange connection valve maintenance technology, and specifically discloses a flange expansion device for flange maintenance. Background Technology

[0002] In industrial production, flange connections are a common method for connecting pipes and equipment. As a key component in flange connections, the performance of the flange gasket directly affects the sealing effect and operational safety of the system. Over time and with changes in the operating environment, gaskets may experience aging, wear, or deformation, leading to a decrease in sealing performance and even leakage. For example, during long-term use, gaskets are subject to erosion by the medium, temperature changes, and mechanical wear, causing their performance to deteriorate and compromising their sealing effectiveness. Under harsh conditions such as high pressure and high temperature, gaskets may deform or be damaged, resulting in leakage.

[0003] Before replacing the gasket, gap widening is usually necessary. This is because during long-term use, factors such as thermal expansion and contraction, and pressure changes can cause the gap between the flange faces to narrow, or even lead to adhesion. If the gasket is replaced directly without widening the gap, it may result in poor sealing or even make it impossible to install a new gasket.

[0004] Flange gaskets and flanged valve connections are widely used in the maintenance of pipe valves. When a flange gasket is damaged and the valve needs to be replaced, the distance between the flanges needs to be increased. If only conventional tools are used, it is difficult to carry out the maintenance work. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a flange expansion device for flange maintenance, so as to solve the problem that when the flange gasket is damaged and the valve needs to be replaced, the distance between the flanges needs to be expanded, and it is difficult to carry out maintenance work using only conventional tools.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a flange expansion device for flange maintenance, comprising an expansion base assembly, wherein the expansion base assembly includes an expansion propulsion assembly, and an expansion locking assembly is provided on one side of the expansion base assembly and the expansion propulsion assembly.

[0007] The expanded base component includes a base plate;

[0008] The expansion propulsion assembly includes a threaded sleeve and a propulsion rod;

[0009] The expansion locking assembly includes an extension plate and a locking rod.

[0010] Furthermore, the base is a rectangular structure with notches on its surface. The notches are symmetrically distributed along both ends of the base. Bearings are fixed through both sides of the inner wall of the notches. A shaft is inserted between two bearings distributed along one side of the notch. The shaft is fitted with the inner wall of any one of the bearings. The surface of the shaft is covered with a positioning sleeve. An expansion head is provided on the outer ring wall of the positioning sleeve. The end of the expansion head away from the positioning sleeve has an inward bend, and the end of the bend has a pointed tip.

[0011] Furthermore, the threaded sleeve is disposed on the base, and the threaded sleeve passes through the center of the base. A push rod is disposed inside the threaded sleeve, and the surface of the push rod is provided with external threads. The external threads and the internal threads of the threaded sleeve are threaded together.

[0012] Furthermore, one end of the push rod is provided with a head, which has a hexagonal structure. A wrench bearing pad is provided on the side of the head near the push rod. The wrench bearing pad, the head, and the push rod are an integrated milling and turning structure.

[0013] Furthermore, a connecting seat is provided at the lower end of the push rod. The connecting seat has a square structure, and a bearing 2 is installed through the interior of the connecting seat. The end of the push rod away from the end head is installed through the bearing 2, and the inner ring wall of the bearing 2 is interference-fitted with the surface of the push rod.

[0014] Furthermore, a shaft support is provided on the inner side of the expansion head, a shaft core is rotatably mounted on the inner side of the shaft support, a rotating sleeve is provided on the surface of the shaft core, a shaft support is provided on both sides of the connecting seat, a shaft core is rotatably mounted inside the shaft support, a rotating sleeve is provided on the surface of the shaft core, and a push plate is provided between the rotating sleeve and the rotating sleeve.

[0015] Furthermore, the extension plate is mounted on the side of the base via connecting rods, which are symmetrically distributed along both sides of the extension plate. A rod sleeve is provided through the middle of the extension plate, and a locking rod is provided at one end of the connecting seat near the extension plate. The surface of the locking rod is slidably sleeved with the inside of the rod sleeve.

[0016] Furthermore, a threaded sleeve II is provided through the surface of the sleeve, and a locking bolt is installed on the threaded sleeve II. Several knobs are provided at the end of the locking bolt, and several threaded grooves are provided on the surface of the locking rod. The end of the locking bolt away from the knob is threadedly installed with the inside of any one of the threaded grooves.

[0017] The working principle and beneficial effects of this solution are as follows: 1. This solution achieves efficient and stable expansion of the flange gap through a symmetrically designed expansion head and a precision propulsion structure. The expansion head adopts a symmetrical distribution design, and its tip can be easily inserted into the flange gap after the screws are removed. The bending structure slides along the inclined plane during the expansion process, which significantly reduces the expansion resistance.

[0018] 2. As described in 1, the push rod, through the precise fit between the threaded sleeve and the base, generates a stable linear pushing force under the operation of the wrench, ensuring that the expansion head expands outward synchronously. The key components made of carbon steel provide extremely high compressive strength and durability, avoiding the risk of deformation or breakage during the expansion process. In addition, the rotation and expansion of the expansion head are achieved through the shaft supported by the bearing, further ensuring the smoothness of the expansion action.

[0019] 3. As described in point 2, the integrated design of the hexagonal end and the wrench bearing pad significantly reduces operational complexity. Workers only need to fit a regular wrench onto the end and place it on the pad to easily apply force and rotate the push rod without needing to adjust the tool position, thus reducing hand fatigue. The bearing connection seat design at the end of the push rod ensures that the connection seat does not rotate during the transmission of pushing force, making the push of the expansion head more linear and precise. The innovation of the locking component lies in its dual protection function: when the locking rod moves with the expansion head, it provides initial guiding stability through the sliding within the rod sleeve; while the cooperation between the threaded sleeve and the locking bolt allows the operator to tighten the bolt into the corresponding thread groove at any expansion position by turning the knob, forming a mechanical hard lock.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the distribution of the various mechanisms in the embodiment;

[0022] Figure 2 This is a schematic diagram of the overall front structure of the embodiment;

[0023] Figure 3 This is a schematic diagram of the overall rear structure of the embodiment;

[0024] Figure 4 This is a partially enlarged schematic diagram of the connector, expansion head, and push plate in an embodiment.

[0025] Figure 5 This is a schematic diagram of the expansion locking component structure in an embodiment;

[0026] Figure 6 This is an enlarged schematic diagram of point A in the embodiment.

[0027] The following are the markings in the attached diagram: 1. Expansion base assembly; 2. Expansion propulsion assembly; 3. Expansion locking assembly; 10. Base; 11. Notch; 12. Bearing 1; 13. Shaft; 14. Positioning sleeve; 15. Expansion head; 16. Bending; 17. Tip; 20. Threaded sleeve 1; 21. Propulsion rod; 22. External thread; 23. End; 24. Wrench bearing washer; 2001. Connecting seat; 2002. Bearing 2; 2003. Shaft support 1; 2004. Rotating sleeve 1; 2005. Shaft support 2; 2006. Rotating sleeve 2; 2007. Propulsion plate; 30. Extension plate; 31. Rod sleeve; 32. Locking rod; 34. Threaded sleeve 2; 35. Locking bolt; 36. Knob; 37. Threaded groove; 38. Connecting rod. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation method:

[0029] Example

[0030] like Figures 1 to 6 As shown, a flange expansion device for flange maintenance is disclosed, including an expansion base assembly 1, an expansion propulsion assembly 2, and an expansion locking assembly 3 provided on one side of the expansion base assembly 1 and the expansion propulsion assembly 2.

[0031] The expansion base component 1 includes a base plate 10;

[0032] The expansion propulsion assembly 2 includes a threaded sleeve 20 and a propulsion rod 21;

[0033] The expansion locking assembly 3 includes an extension plate 30 and a locking rod 32.

[0034] The base 10 has a rectangular structure. Notches 11 are formed on the surface of the base 10, symmetrically distributed along both ends of the base 10. Bearings 12 are fixed through both sides of the inner wall of each notch 11. The bearings 12 are welded to the notches 11. A shaft 13 is inserted between two bearings 12 distributed along one side of the notch 11. The shaft 13 mates with the inner wall of any one bearing 12. A positioning sleeve 14 covers the surface of the shaft 13, and the positioning sleeve 14 is welded to the shaft 13. An expansion head 15 is provided on the outer ring wall of the positioning sleeve 14. The end of the expansion head 15 near the positioning sleeve 14 is welded to the outer ring wall of the positioning sleeve 14. The end of the expansion head 15 away from the positioning sleeve 14 has an inwardly bent section 16. The end of the bent section 16 is... The expansion head 15, with its tip 17, is symmetrically distributed on both sides of the base 10, forming a counter-expansion structure. After retraction, the two tips 17 can serve as a closing point. The thin design of the tips 17 allows for expansion without the need for transmission tools when gaps are created after removing screws and bolts between adjacent flanges. The two symmetrically distributed tips 17 are inserted into the gaps between adjacent flanges and wait for expansion. The bent part 16 can slide along the inclined plane during continuous expansion, making the expansion path smoother. The expansion head 15 is the main lever arm and can provide sufficient expansion strength during continuous expansion. When the expansion head 15 is extended outward, it can rotate based on the bearing 12 by the shaft 13 fixed in the center of the positioning sleeve 14, which can realize the rotation and outward expansion of the expansion head 15, thereby ensuring stable expansion.

[0035] A threaded sleeve 20 is mounted on the base 10 and passes through the center of the base 10. The connection between the threaded sleeve 20 and the base 10 is fixed by welding. A push rod 21 is installed through the inside of the threaded sleeve 20. Key components such as the push rod 21, the expansion head 15, and the base 10 are all made of carbon steel. Carbon steel has high strength and hardness and can withstand large loads and impacts. In particular, medium carbon steel and high carbon steel can significantly improve their strength and toughness after appropriate heat treatment. The surface of the push rod 21 is provided with external threads 22. The external threads 22 are threadedly installed with the internal threads of the threaded sleeve 20. The push rod 21, made of carbon steel, has sufficient lightness when continuously pushing, avoiding breakage during pushing. The external threads 22 on the surface of the push rod 21 can move threadedly relative to the threaded sleeve 20, which can cooperate with the components that push the expansion head 15 to extend and retract for stable pushing.

[0036] One end of the push rod 21 is provided with a head 23, which is hexagonal in shape. The head 23 can be rotated with a wrench, so that when the wrench is rotated, the external thread 22 of the push rod 21 can move relative to the threaded sleeve 20. A wrench bearing washer 24 is provided on the side of the head 23 near the push rod 21. The wrench bearing washer 24, the head 23 and the push rod 21 are integrated milling structure. When milling the head 23, it is not milled through directly, leaving part of the thickness to form the wrench bearing washer 24. When operating the wrench, the wrench can be supported on the wrench bearing washer 24 when the head 23 is rotated, which improves the convenience of the push operation. The worker does not need to hold the wrench and control the position of the head 23, reducing the burden on the hands.

[0037] The lower end of the push rod 21 is provided with a connecting seat 2001. The connecting seat 2001 has a square structure. A bearing 2002 is installed through the interior of the connecting seat 2001. The connection position between the bearing 2002 and the connecting seat 2001 is fixed by welding. The end of the push rod 21 away from the end 23 is installed through the bearing 2002. The inner ring wall of the bearing 2002 is interference-fitted with the surface of the push rod 21. When the push rod 21 rotates and pushes, the end connected to the connecting seat 2001 can rotate based on the bearing 2002. Thus, the connecting seat 2001 can drive the push component of the expansion head 15 to move without rotating and pushing with the push rod 21.

[0038] An expansion head 15 has a shaft support 2003 on its inner side. One end of the shaft support 2003 is welded and fixed to the surface of the expansion head 15. A shaft core is rotatably mounted on the inner side of the shaft support 2003. A rotating sleeve 2004 is provided on the surface of the shaft core. The connection between the rotating sleeve 2004 and the shaft core is fixed by screws. A shaft support 2005 is provided on both sides of the connecting seat 2001. One end of the shaft support 2005 is welded and fixed to the surface of the connecting seat 2001. The interior of the shaft support 2005... A second shaft core is rotatably mounted, and a second rotating sleeve 2006 is provided on the surface of the second shaft core. The connection between the second rotating sleeve 2006 and the second shaft core is fixed by screws. A push plate 2007 is provided between the second rotating sleeve 2006 and the first rotating sleeve 2004. The two ends of the push plate 2007 are welded and fixed to the outer ring wall of the first rotating sleeve 2004 and the outer ring wall of the second rotating sleeve 2006, respectively. In the entire pushing process, a gap is first created after the screws or bolts on the flange are removed. Then, the expansion head 15, which is closed at both ends, is pushed through the tip 17. The position is inserted into the gap, waiting for expansion. The wrench engages with end 23 and is supported on the wrench bearing pad 24. When the wrench is turned, the position of end 23 can be stably rotated without additional control. As end 23 rotates, push rod 21 rotates synchronously, causing its external thread 22 to move in relation to the internal thread of threaded sleeve 20, thus enabling the movement of connecting seat 2001. Push rod 21 also rotates based on bearing 2002, preventing connecting seat 2001 from rotating with push rod 21. During continuous advancement, the rotating sleeve 2004 rotates in conjunction with the shaft core 2003 based on the shaft support 2003, and the rotating sleeve 2006 rotates in conjunction with the shaft core 2005 based on the shaft support 2005, so that the push plate 2007 can be pushed and moved in conjunction with the connecting seat 2001 for rotational adjustment. Thus, the push plates 2007 distributed on both sides can mutually limit the connecting seat 2001, so that the two expansion heads 15 can move outward simultaneously and expand the gap between the flanges.

[0039] The extension plate 30 is installed on the side of the base 10 via connecting rods 38. The connecting rods 38 are symmetrically distributed along both sides of the extension plate 30. The two ends of the connecting rods 38 are welded and fixed to the surface of the base 10 and the surface of the extension plate 30, respectively. A sleeve 31 is provided through the middle of the extension plate 30. The connection position of the sleeve 31 and the extension plate 30 is fixed by welding. A locking rod 32 is provided at one end of the connecting seat 2001 near the extension plate 30. The locking rod 32 is welded and fixed to the surface of the connecting seat 2001. The locking rod 32 has an L-shaped structure. The surface of the locking rod 32 is slidably sleeved with the inside of the sleeve 31. When the connecting seat 2001 is stably pushed forward or retracted, the locking rod 32 slides in the sleeve 31 to achieve the telescopic position.

[0040] A threaded sleeve 34 is provided through the surface of the sleeve 31. The connection between the threaded sleeve 34 and the sleeve 31 is fixed by welding. A locking bolt 35 is installed on the threaded sleeve 34. Several knobs 36 are provided at the end of the locking bolt 35. One end of the knob 36 is welded to the end of the locking bolt 35. Several threaded grooves 37 are provided on the surface of the locking rod 32. The distance between adjacent threaded grooves 37 is two millimeters. The end of the locking bolt 35 away from the knob 36 is threaded to the inside of any threaded groove 37. After the two expansion heads 15 are inserted into the gap for expansion, in order to avoid the squeezing force of the two flanges rebounding, pressure is applied to the expansion heads 15, causing the push rod 21 to rotate in the opposite direction. By the threaded connection between the locking bolt 35 and the threaded groove 37 at the current expansion position, the two expansion heads 15 can be stabilized during expansion.

[0041] In practice

[0042] In this design, the base 10 of the expansion foundation component 1 is a rectangular structure. A bearing 12 is installed within a symmetrical notch 11 on its surface. A shaft 13 passes through the bearing 12 and is welded to a fixing positioning sleeve 14. The expansion head 15 on the outer ring of the positioning sleeve 14 achieves initial insertion into the flange gap through bending 16 and a pointed tip 17. When a small gap is created after the flange bolts are removed, the symmetrically distributed pointed tips 17 insert into the gap, providing a fulcrum for subsequent expansion.

[0043] The threaded sleeve 20 of the expansion propulsion assembly 2 is welded and fixed to the center of the base 10. The propulsion rod 21 moves axially through the threaded engagement of the external thread 22 and the threaded sleeve 20. When the hexagonal end 23 is rotated, the propulsion rod 21 drives the connecting seat 2001 to move. The connecting seat 2001 is prevented from rotating with the propulsion rod 21 by the bearing 2002, thus maintaining linear propulsion. The shaft support 2003 on the inner side of the expansion head 15 and the shaft support 2005 on both sides of the connecting seat 2001 are linked through the rotating sleeve 2004, the rotating sleeve 2006 and the propulsion plate 2007 to convert the linear motion of the connecting seat 2001 into the symmetrical outward expansion motion of the expansion head 15, and finally achieve stable expansion of the flange gap.

[0044] The expansion locking assembly 3 is fixed to the side of the base 10 via the extension plate 30 and the connecting rod 38. The rod sleeve 31 passes through the extension plate 30 and slides in cooperation with the locking rod 32. The locking rod 32 has an L-shaped structure and is welded to the connecting seat 2001. It slides in the rod sleeve 31 as the expansion propulsion assembly 2 moves. When the expansion head 15 reaches the target expansion position, the locking bolt 35 in the threaded sleeve 34 is screwed into the threaded groove 37 on the surface of the locking rod 32 through the knob 36 to achieve mechanical locking. The 2 mm spacing between adjacent threaded grooves 37 allows for fine adjustment of the locking position, ensuring the stability of the expansion head 15 under different flange thicknesses. This mechanism effectively resists the flange rebound pressure and prevents the propulsion rod 21 from reversing due to the reverse force, thereby maintaining the expansion state. The rigid cooperation between the locking bolt 35 and the threaded groove 37 further enhances the compressive strength of the expansion head 15 and ensures the safety of long-term operation.

[0045] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A flange expansion device for flange maintenance, characterized in that: It includes an expansion base component, which includes an expansion propulsion component, and an expansion locking component is provided on one side of the expansion base component and the expansion propulsion component; The expanded base component includes a base plate; The expansion propulsion assembly includes a threaded sleeve and a propulsion rod; The expansion locking assembly includes an extension plate and a locking rod.

2. A flange expansion device for flange maintenance according to claim 1, characterized in that: The base is a rectangular structure with notches on its surface. The notches are symmetrically distributed along both ends of the base. Bearings are fixed through both sides of the inner wall of the notches. A shaft is inserted between two bearings distributed along one side of the notch. The shaft is fitted with the inner wall of any one of the bearings. The surface of the shaft is covered with a positioning sleeve. An expansion head is provided on the outer ring wall of the positioning sleeve. The end of the expansion head away from the positioning sleeve has an inward bend, and the end of the bend has a pointed tip.

3. A flange expansion device for flange maintenance according to claim 2, characterized in that: The threaded sleeve is mounted on the base and passes through the center of the base. A push rod is installed through the inside of the threaded sleeve, and the surface of the push rod is provided with external threads. The external threads and the internal threads of the threaded sleeve are threaded together.

4. A flange expansion device for flange maintenance according to claim 3, characterized in that: One end of the push rod is provided with a hexagonal end, and a wrench bearing pad is provided on the side of the end near the push rod. The wrench bearing pad, the end, and the push rod are an integrated milling and turning structure.

5. A flange expansion device for flange maintenance according to claim 4, characterized in that: The lower end of the push rod is provided with a connecting seat. The connecting seat has a square structure and a bearing 2 is installed through the interior of the connecting seat. The end of the push rod away from the end is installed through the bearing 2. The inner ring wall of the bearing 2 is interference-fitted with the surface of the push rod.

6. A flange expansion device for flange maintenance according to claim 5, characterized in that: The expansion head is provided with a shaft support 1 on its inner side, a shaft core 1 is rotatably mounted on the inner side of the shaft support 1, a rotating sleeve 1 is provided on the surface of the shaft core 1, and shaft supports 2 are provided on both sides of the connecting seat. A shaft core 2 is rotatably mounted inside the shaft support 2, a rotating sleeve 2 is provided on the surface of the shaft core 2, and a push plate is provided between the rotating sleeve 2 and the rotating sleeve 1.

7. A flange expansion device for flange maintenance according to claim 6, characterized in that: The extension plate is mounted on the side of the base via connecting rods. The connecting rods are symmetrically distributed along both sides of the extension plate. A rod sleeve is inserted through the middle of the extension plate. A locking rod is provided at one end of the connecting seat near the extension plate. The surface of the locking rod is slidably fitted with the inside of the rod sleeve.

8. A flange expansion device for flange maintenance according to claim 7, characterized in that: The surface of the rod sleeve is provided with a threaded sleeve II, and a locking bolt is installed on the threaded sleeve II. Several knobs are provided at the end of the locking bolt. Several threaded grooves are provided on the surface of the locking rod. The end of the locking bolt away from the knob is threaded to the inside of any one of the threaded grooves.

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