Ball valve overhauling tool

Abstract

The utility model relates to a ball valve overhauling tool, and belongs to the technical field of ball valve overhauling. Comprising a first connecting structure suitable for abutting against a ball valve seat; the second connecting structure is suitable for abutting against a ball valve flange; the drawing structure is used for connecting the first connecting structure with the second connecting structure and is suitable for applying a bearing acting force; the wedge-shaped locking structure is provided with a wedge-shaped part I and a wedge-shaped part II; the wedge-shaped part I is arranged between the first connecting structure and the drawing structure; and the wedge-shaped part II is arranged between the first connecting structure and the annular groove of the ball valve seat. The problem that 12: 00 and 6: 00 positions cannot be overhauled in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of ball valve overhauling, and particularly relates to a ball valve overhauling tool. BACKGROUND

[0002] Ball valves, especially large-diameter fixed shaft ball valves, are key control elements in industrial pipelines. Their sealing performance is directly related to production safety and efficiency. During the production, installation and maintenance of the valve, strict pressure testing is usually required to check the sealing performance.

[0003] In the existing overhauling practice, when the valve leaks during pressure testing, the traditional inspection and repair method is to rotate the ball to a half-open position. This method can expose and repair most of the ball sealing surface or the valve seat sealing surface.

[0004] However, this traditional method has an inherent technical defect. Since the ball of the fixed shaft ball valve is rotated by its upper and lower trunnions (i.e., fixed shafts), it means that in the areas of the top of the ball (12:00 position direction) and the bottom of the ball (6:00 position direction), the ball sealing surface and the valve seat sealing surface always maintain close contact during the entire opening and closing process and cannot be naturally separated.

[0005] Therefore, once the sealing surface at these key positions is slightly scratched, impurity indentation or corroded, causing leakage, the maintenance personnel cannot effectively inspect, clean or repair the part. Ultimately, the only solution to the sealing leakage at the 12:00 and 6:00 positions is to completely disassemble the valve. This disassembly and repair, especially for fully welded ball valves, not only has a complex process, time-consuming and laborious, but also requires a large amount of downtime and high repair costs, causing huge economic losses. INVENTION CONTENTS

[0006] To solve the above technical problems of the prior art, the utility model provides a ball valve overhauling tool.

[0007] To achieve the above purpose, the utility model adopts the technical scheme of:

[0008] Provided is a ball valve overhauling tool, comprising:

[0009] A first connecting structure is adapted to abut against the valve seat of the ball valve;

[0010] A second connecting structure is adapted to abut against the flange of the ball valve;

[0011] A pulling structure connects the first connecting structure and the second connecting structure and is adapted to apply a bearing force;

[0012] A wedge-shaped locking structure has a wedge-shaped first part and a wedge-shaped second part;

[0013] The first connecting structure is disposed between the first connecting structure and the pull structure;

[0014] The second wedge-shaped part is disposed between the first connecting structure and the annular groove of the ball valve seat;

[0015] The wedge-shaped locking structure is configured to drive the first connecting structure to expand radially under the axial force of the pull structure, and the second wedge-shaped part is wedged into the annular groove and simultaneously applies radial force for locking and axial force for pulling to the groove wall of the annular groove.

[0016] Preferably, the first wedge-shaped part comprises:

[0017] A driving wedge-shaped surface disposed on the pull structure;

[0018] And a driven wedge-shaped surface disposed on the first connecting structure and matched with the driving wedge-shaped surface.

[0019] Preferably, the second wedge-shaped part comprises:

[0020] A clamping wedge-shaped surface disposed on the outer edge of the first connecting structure;

[0021] And the annular groove is a wedge-shaped annular groove matched with the clamping wedge-shaped surface.

[0022] Preferably, the first connecting structure comprises:

[0023] A plurality of clamping blocks, and each clamping block is arc-shaped.

[0024] Preferably, the second connecting structure comprises:

[0025] A support ring adapted to abut the ball valve flange, and a plurality of through holes are formed on the support ring for the pull structure to pass through.

[0026] Preferably, it comprises:

[0027] A centering structure, the centering structure comprises a plurality of positioning arc blocks arranged circumferentially along the support ring;

[0028] The positioning arc blocks are adapted to be nested with the positioning arc grooves formed on the ball valve flange.

[0029] Preferably, the pull structure comprises:

[0030] A pull plate, and the driving wedge-shaped surface is disposed on the pull plate;

[0031] A plurality of screw rods, one end of which is connected with the pull plate, and the other end passes through the through hole of the support ring;

[0032] a plurality of nuts cooperating with the screw thread of the screw, the nuts being adapted to abut against the support ring to exert the axial force.

[0033] Preferably, comprising:

[0034] a plurality of stroke limiting sleeves, each of the stroke limiting sleeves being sleeved on the screw of the puller structure and located between the puller plate and the second connecting structure.

[0035] Preferably, a plurality of elastic buffer assemblies;

[0036] Each of the elastic buffer assemblies is arranged between the nut and the support ring and is configured to be elastically deformed when the nut is tightened to buffer and indicate the axial force.

[0037] Preferably, the elastic buffer assembly is a disc spring set.

[0038] The ball valve maintenance tool has the following beneficial effects:

[0039] The axial force applied is converted into a radial self-locking force and an axial pulling force by the wedge-shaped locking structure, so that the valve seat and the spherical sealing surface can be stably separated, usually by 2-3mm gap, so that the sealing surface can be cleaned or repaired by metallographic sandpaper at 360°, avoiding valve disassembly, and finally solving the problem that the 12:00 and 6:00 positions cannot be maintained in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 An assembly diagram of the ball valve maintenance tool is provided.

[0041] Figure 2 A front view of the ball valve maintenance tool is provided.

[0042] Figure 3 A Figure 2 A local enlarged schematic view of the structure at A is shown.

[0043] Figure 4 A structure schematic view of the wedge-shaped first part and the wedge-shaped second part in the ball valve maintenance tool is provided.

[0044] Explanation of reference signs:

[0045] 1, the first connecting structure; 2, the ball valve seat; 201, the annular groove; 3, the second connecting structure; 4, the ball valve flange; 5, the drawing structure; 501, the pull plate; 502, the screw rod; 503, the nut; 601, the wedge-shaped one part; 602, the wedge-shaped two parts; 7, the centering structure; 8, the stroke limiting sleeve. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0047] Please refer to Figures 1-4 The specific embodiments provided by the utility model are as follows:

[0048] As Figures 1 to 2 shown in the embodiments of the utility model, a ball valve maintenance tool is provided, which comprises a first connecting structure 1, a second connecting structure 3, a drawing structure 5 and a wedge-shaped locking structure.

[0049] Specifically, the first connecting structure 1 is an abutting component capable of interacting with the annular groove 201 pre-set on the ball valve seat 2. The second connecting structure 3 is a supporting component, which is adapted to abut on the end flange face of the ball valve when the tool is working, so as to provide a stable reaction force reference point for the whole tool.

[0050] The drawing structure 5 is a force applying mechanism, and mechanically connects the first connecting structure 1 and the second connecting structure 3. The function of the drawing structure 5 is to generate an axial force when operated, which drives the first connecting structure 1 to move towards the second connecting structure 3, so as to realize the drawing of the valve seat.

[0051] As Figure 4 shown above, the embodiment further comprises a wedge-shaped locking structure. The wedge-shaped locking structure is composed of a wedge-shaped one part 601 and a wedge-shaped two part 602.

[0052] Specifically, the wedge-shaped one part 601 is arranged between the first connecting structure 1 and the drawing structure 5. Specifically, a driving wedge surface is formed on the drawing structure 5, and a driven wedge surface matched with the driving wedge surface is formed on the first connecting structure 1, and the two wedge surfaces jointly constitute the wedge-shaped one part 601.

[0053] The wedge-shaped second part 602 is arranged between the first connecting structure 1 and the wedge-shaped annular groove 201 of the valve seat. Specifically, the outer edge of the first connecting structure 1 is processed into a clamping wedge surface which is used to cooperate with the wedge-shaped annular groove 201 with corresponding angle which is processed in advance on the valve seat, and the two together constitute the wedge-shaped second part 602.

[0054] Therefore, in actual use, first, the device is placed inside the valve, the first connecting structure 1 is aligned with the wedge-shaped annular groove 201 of the valve seat, and the second connecting structure 3 is abutted on the valve flange. Then, the operator starts the pulling structure 5 to exert an axial force.

[0055] The axial force first acts on the wedge-shaped first part 601. Under the drive of the pulling structure 5, the driving wedge surface will slide along the driven wedge surface of the first connecting structure 1, which will decompose and convert the axial pulling force into a radial force that expands the first connecting structure 1 as a whole.

[0056] With the radial expansion of the first connecting structure 1, the clamping wedge surface of its outer edge (i.e. the wedge-shaped second part 602) will be tightly wedged into the wedge-shaped annular groove 201 of the valve seat. This wedging action has a double effect: on the one hand, it exerts a radial force on the groove wall of the wedge-shaped annular groove 201, which generates a locking effect due to friction, ensuring that the first connecting structure 1 will not slip out of the wedge-shaped annular groove 201 under the pulling force, forming a self-locking effect that gets tighter and tighter; on the other hand, the geometric angle of the wedge surface will decompose this radial force and generate an axial force for pulling out the valve seat.

[0057] In summary, the embodiment converts the applied axial force into radial self-locking force and axial pulling force through the wedge-shaped locking structure, so as to stably separate the valve seat from the ball sealing surface. Generally, the ball sealing surface and the valve seat are pulled out by 2-3mm gap, so that the sealing surface can be cleaned or repaired with metallographic sandpaper at 360°, avoiding valve disassembly, and finally solving the problem that the 12:00 and 6:00 positions cannot be repaired in the prior art.

[0058] In a preferred embodiment, the first connecting structure 1 comprises a plurality of independent claw blocks.

[0059] In order to achieve uniform contact with the circular annular groove 201 on the ball valve seat 2, each claw block is processed into an arc shape. When installed, a plurality of arc-shaped claw blocks can be respectively clamped into the wedge-shaped annular groove 201 of the valve seat.

[0060] The structure of the plurality of clamping blocks is adopted to facilitate installation. Due to the limited space inside the valve, the integral annular structure cannot be placed, while the split arc clamping blocks can be placed and positioned one by one, greatly improving the convenience and feasibility of operation.

[0061] In a preferred embodiment, the second connecting structure 3 is a rigid supporting ring.

[0062] In operation, the supporting ring is placed on the end flange of the ball valve, and a stable and reliable reaction force support point is provided for the pulling structure 5 by abutting against the flange surface.

[0063] In order to cooperate with the pulling structure 5, a plurality of through holes are uniformly distributed along the circumferential direction of the supporting ring. These through holes are the passageways of the force transmission components (such as the screw rods 502) in the pulling structure 5. When the pulling force is applied, the screw rods 502 of the pulling structure 5 pass through the through holes, and the nuts 503 are tightened on the outside of the supporting ring. The pressure applied by the nuts 503 acts on the supporting ring, which in turn transmits the pressure to the ball valve flange 4, thereby generating an axial pulling force in the opposite direction and acting on the screw rods 502 under the interaction of forces, and finally realizing the pulling of the first connecting structure 1.

[0064] As shown in the drawings, in a preferred embodiment, a centering structure 7 is further included. Figure 3

[0065] Specifically, the centering structure 7 includes a plurality of positioning arc blocks uniformly distributed along the bottom surface of the supporting ring (i.e. the surface in contact with the flange). Correspondingly, the ball valve flange 4 used with the tool also has positioning arc grooves matching the positioning arc blocks in position, number and shape.

[0066] In installation, the operator only needs to align the positioning arc blocks on the supporting ring with the positioning arc grooves on the flange and place them, so as to realize the nesting cooperation between them.

[0067] Firstly, automatic centering without error is realized, the tedious steps and potential errors of manual adjustment are eliminated, and the absolute coaxiality of the subsequent pulling force can be guaranteed from the initial stage of operation. Secondly, the nesting structure of the positioning arc blocks and the positioning arc grooves also plays a role in circumferential locking, which can effectively resist the rotational torque generated when tightening the nuts 503, prevent the entire tool from rotating on the flange, and greatly improve the stability and safety of operation.

[0068] In a preferred embodiment, the pulling structure 5 is composed of a pulling plate 501, a plurality of screw rods 502 and a plurality of nuts 503.

[0069] ​Specifically, the pull plate 501 is a core driving element inside the tool. The driving wedge surface mentioned in the foregoing embodiments is processed on the pull plate 501, which cooperates with the driven wedge surface on the first connecting structure 1 (the jaw block) to drive the radial expansion thereof.

[0070] The plurality of screw rods 502 are force transmission rods connecting the inner and outer parts of the tool. One end (the inner end) is connected to the pull plate 501, the rod body passes through the through hole of the support ring, and the other end (the outer end) extends to the outside of the tool and is threaded.

[0071] The plurality of nuts 503 are force applying execution elements, each of which is threaded with the outer end of the corresponding screw rod 502.

[0072] In operation, the operator tightens each nut 503 outside the tool by means of a tool (such as a wrench). Since the support ring is stopped by the valve flange and cannot move, the nut 503 will abut against the outer surface of the support ring and apply pressure to it when tightened. According to the principle of force interaction, the nut 503 will be subjected to a counteracting tensile force from the screw rod 502, which is transmitted through the screw rod 502 body and ultimately to the pull plate 501 connected to the inner end of the screw rod 502, thereby driving the pull plate 501 to produce axial displacement and starting the entire wedge locking and drawing process.

[0073] In a preferred embodiment, a plurality of travel limiting sleeves 8 are further included.

[0074] Each travel limiting sleeve 8 is a hollow tubular structure, the axial length of which is determined according to the preset maximum drawing travel (for example, 3 mm).

[0075] Before the tool is installed and ready for drawing operation, each travel limiting sleeve 8 is respectively clearance-fitted on the screw rod 502 of the corresponding drawing structure 5, and located between the pull plate 501 and the second connecting structure 3 (i.e. the support ring).

[0076] When the drawing operation starts, the pull plate 501 will gradually approach the support ring, and when the drawing travel reaches the preset travel, the inner surface of the pull plate 501 will contact one end of the sleeve. At this time, a rigid physical barrier is formed between the pull plate 501, the sleeve and the support ring, so that the pull plate 501 cannot continue to move, thereby effectively preventing the risk of valve seat jamming or falling due to excessive drawing, and changing the travel control of the maintenance operation from relying on the experience of the operator to quantitative control guaranteed by the mechanical structure, greatly improving the accuracy and safety of the tool.

[0077] In a preferred embodiment, a plurality of elastic buffer assemblies are further included.

[0078] Each of the elastic buffering assemblies, for example, a set of disc spring groups, is arranged between the corresponding nut 503 and the support ring. Thus, when the nut 503 is tightened, the force is first transmitted to the elastic buffering assembly and causes elastic deformation. This process changes the rigid threaded drive into a flexible elastic drive, which can effectively absorb and eliminate the impact load caused by uneven manual operation, ensures the smooth application of the pulling force, and avoids impact damage to the precision sealing surface of the valve seat.

[0079] In addition, since the elastic deformation amount is generally proportional to the acting force, the operator can directly observe the compression degree of the elastic buffering assembly to intuitively judge the size of the current axial acting force. This changes the entire pulling process from experience-dependent blind operation to visual operation, thereby effectively avoiding the risk of equipment damage caused by excessive force.

[0080] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and deformations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A ball valve maintenance tool, characterized in that: include: The first connecting structure is adapted to abut against the valve seat of the ball valve; The second connection structure is adapted to form abutment with the ball valve flange; a pulling structure connecting the first connecting structure and the second connecting structure and adapted to apply a bearing force; A wedge-shaped locking structure having a first wedge-shaped portion and a second wedge-shaped portion; The wedge-shaped portion is disposed between the first connecting structure and the pulling structure; The second wedge-shaped portion is arranged between the first connecting structure and the annular groove of the ball valve seat; The wedge-shaped locking structure is configured such that, under the axial force of the pulling structure, the first wedge-shaped portion drives the first connecting structure to expand radially, and the second wedge-shaped portion wedges into the annular groove and simultaneously applies a radial force for locking and an axial force for pulling to the groove wall of the annular groove.

2. The ball valve repair tool according to claim 1, characterized in that: The wedge-shaped portion comprises: a driving wedge surface provided on the drawing structure; and a driven wedge surface provided in the first connection structure and cooperating with the driving wedge surface.

3. The ball valve maintenance tool according to claim 1 or 2, characterized in that: The wedge-shaped second part comprises: a clamping wedge-shaped surface provided on the outer edge of the first connecting structure; Furthermore, the annular groove is a wedge-shaped annular groove to match the clamping wedge surface.

4. The ball valve repair tool according to claim 3, characterized in that: The first connection structure includes: A plurality of claw blocks are provided, and each of the claw blocks is arc-shaped.

5. The ball valve repair tool according to claim 3, characterized in that: The second connection structure includes: A supporting ring is suitable for abutting against the ball valve flange, and a plurality of through holes are provided on the supporting ring for the pulling structure to pass through.

6. The ball valve repair tool according to claim 5, characterized in that: include: A centering structure, the centering structure comprising a plurality of positioning arc blocks arranged along the circumference of the support ring; The positioning arc block is suitable for being nested and matched with the positioning arc groove provided on the ball valve flange.

7. The ball valve repair tool according to claim 6, characterized in that: The drawing structure comprises: a pull plate, the driving wedge surface being disposed on the pull plate; a plurality of screws, one end of which is connected to the pull plate and the other end of which passes through the through hole of the support ring; A plurality of nuts are threadably matched with the screw rod, and the nuts are adapted to abut against the support ring to exert the axial force.

8. The ball valve repair tool according to claim 7, characterized in that: include: A plurality of stroke limiting sleeves, each of which is sleeved on the screw of the pulling structure and located between the pulling plate and the second connecting structure.

9. The ball valve repair tool according to claim 7, characterized in that: Multiple elastic buffer components; Each elastic buffer assembly is disposed between the nut and the supporting ring and is configured to undergo elastic deformation when the nut is tightened, so as to buffer and indicate the axial force.

10. The ball valve repair tool according to claim 9, characterized in that: The elastic buffer component is a disc spring group.

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