Expansion maintenance auxiliary positioning device of flange connection valve

Abstract

The utility model discloses an expansion maintenance auxiliary positioning device of a flange connection valve, the auxiliary positioning device is axially and internally supported and positioned on the axial end faces of connection flanges at the two ends of the valve, and the auxiliary positioning device comprises a screw rod, a fixed inner supporting block and a movable inner supporting block, a movable inner supporting block is axially and adjustably connected to the screw rod; a sleeve is connected to the screw in a threaded sleeving mode, the inner wall of the sleeve is connected to the circumferential outer wall of the screw in a threaded sleeving mode, and the outer portion of the sleeve is a smooth outer wall. The smooth outer wall of the sleeve is sleeved with the movable inner supporting block in a lifting and sliding mode, and one end of the movable inner supporting block is vertically and fixedly connected with a hydraulic cylinder. And a piston rod of the hydraulic cylinder vertically penetrates through the movable inner supporting block and is propped against the upper surface of the fixed inner supporting block. According to the device, the hydraulic cylinder assists in providing expansion force between the two flanges, on one hand, overlarge stress on threads is avoided, on the other hand, resistance when a worker rotates a nut is reduced, and the device is simple in structure and easy to implement.

Description

Technical Field

[0001] The utility model relates to the technical field of valve maintenance, in particular to an expansion maintenance auxiliary positioning device for flange-connected valves. Background Art

[0002] In the water / steam circulation pipelines of existing power plants, valves are often used to control the on / off of the pipe connections at both ends. Flanges are fixed at the pipe connections at both ends, and the valve is embedded between the two flanges through a sealing gasket. Finally, the two flanges are clamped in opposite directions by tension bolts to seal and fix the valve.

[0003] However, in actual use, it is found that the gasket at the connection between the valve and the flange needs to be replaced frequently to avoid valve leakage caused by damage to the gasket. However, since the inlet and outlet ports of the valve are coaxially embedded in the flange, and the axial relative displacement of the pipelines at both ends of the valve is very limited and difficult to locate, the patentee has developed the following preliminary research and development results:

[0004] Chinese patent CN220428255U discloses a flange maintenance expansion tool, which includes an adjustment rod; a first expansion block, which is sleeved and fixed on the adjustment rod, and a first fixing plate is connected to the first expansion block; a second expansion block, which is movably sleeved on the adjustment rod, and a second fixing plate is connected to the second expansion block. By placing the first fixing plate and the second fixing plate between the flanges, the distance between the first expansion block and the second expansion block is changed and fixed to achieve expansion between the flanges. The utility model places the first fixing plate and the second fixing plate between the flanges, and then adjusts the positions of the first fixing plate and the second fixing plate by moving the second expansion block, thereby achieving expansion of the distance between the flanges to meet maintenance needs.

[0005] However, the above flange inspection tools have the following problems:

[0006] 1. It is necessary to manually provide the rotational force of the nut on the screw. When the axial stress of the pipelines at both ends of the valve is large, it is difficult for the construction workers to move the wrench to rotate, which is time-consuming and laborious;

[0007] 2. If a person moves the nut by increasing the output force, a large radial force will be applied to the screw, which may cause the overall expansion tool to break away from the inner support position of the two flanges, posing a great safety hazard;

[0008] 3. The interaction force between the nut and the screw is too large, which may easily damage the thread or cause locking.

[0009] In summary, how to design an auxiliary positioning device for expansion maintenance, which is specifically used for the above working conditions to solve the above three problems, has become a technical problem that needs to be urgently solved by people in this field. Utility Model Content

[0010] The purpose of the utility model is to solve the deficiencies of the prior art and to propose an expansion maintenance auxiliary positioning device for flange-connected valves. The device uses a hydraulic cylinder to assist in providing an expansion force between two flanges, which on the one hand prevents the threads from being subjected to excessive force, and on the other hand reduces the resistance when personnel rotate the nut. The device has a simple structure and is easy to implement.

[0011] An auxiliary positioning device for expansion and maintenance of flange-connected valves, wherein the auxiliary positioning device is axially supported and positioned on the axial end faces of the connecting flanges at both ends of the valve, and the auxiliary positioning device comprises a screw, a fixed inner support block and a movable inner support block, wherein the fixed inner support block is radially fixed on the screw, and the movable inner support block is axially adjustable and connected on the screw;

[0012] A sleeve is connected to the threaded sleeve on the screw, the inner wall thread of the sleeve is connected to the circumferential outer wall of the screw, and the outside of the sleeve is made into a smooth outer wall; the movable inner support block is lifted and slidably sleeved on the smooth outer wall of the sleeve, and one end of the movable inner support block is vertically fixed with a hydraulic cylinder; the piston rod of the hydraulic cylinder vertically penetrates the movable inner support block and is supported on the upper surface of the fixed inner support block.

[0013] Preferably, a hexagonal nut is coaxially fixed to the bottom of the sleeve, the outer diameter of the hexagonal nut is larger than the outer diameter of the sleeve, and the internal thread of the hexagonal nut is sleeved and connected to the screw rod.

[0014] Preferably, the axial end surface at the top of the hexagonal nut is downwardly limited and overlapped with a movable inner support block.

[0015] The advantages and technical effects of the utility model are:

[0016] The utility model discloses an auxiliary positioning device for expansion and maintenance of flange-connected valves. The device adds a sleeve and a hydraulic cylinder on the basis of the existing technology, wherein the hydraulic cylinder provides back-moving power for the fixed inner support block and the movable inner support block, the outer wall of the sleeve provides a fulcrum and a lifting and sliding guide for the movable inner support block, and the hexagonal nut at the bottom of the sleeve limits the downward movement of the movable inner support block. On the other hand, the hexagonal nut facilitates manual hand-held wrench to apply rotational force to the sleeve; finally, the main output force of the hydraulic cylinder is adopted, and then the principle of manual rotation of the sleeve limit locking is adopted to avoid excessive force on the thread. At the same time, since there is no need to manually apply excessive rotational force to the hexagonal nut, the radial force problem that causes the screw deflection is also solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 And a schematic diagram of the positioning posture of the utility model;

[0019] In the figure: 1-movable inner support block; 2-screw; 3-sleeve; 4-hydraulic cylinder; 5-hexagonal nut; 6-fixed inner support block; 7-connecting flange; 8-valve. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] An auxiliary positioning device for expansion and maintenance of flange-connected valves, wherein the auxiliary positioning device is axially supported and positioned on the axial end faces of the connecting flanges 7 at both ends of the valve 8, and the auxiliary positioning device comprises a screw 2, a fixed inner support block 6 and a movable inner support block 1, wherein the fixed inner support block is radially fixed on the screw, and the movable inner support block is axially adjustable and connected on the screw;

[0023] A sleeve 3 is connected to the threaded sleeve on the screw, the inner wall thread of the sleeve is connected to the circumferential outer wall of the screw, and the outside of the sleeve is made into a smooth outer wall; the movable inner support block is lifted and slidably sleeved on the smooth outer wall of the sleeve, and one end of the movable inner support block is vertically fixed with a hydraulic cylinder 4; the piston rod of the hydraulic cylinder vertically penetrates the movable inner support block and is supported on the upper surface of the fixed inner support block.

[0024] Preferably, a hexagonal nut 5 is coaxially fixed to the bottom of the sleeve, the outer diameter of the hexagonal nut is larger than the outer diameter of the sleeve, and the internal thread of the hexagonal nut is sleeved and connected to the screw rod.

[0025] Preferably, the axial end surface at the top of the hexagonal nut is downwardly limited and overlapped with a movable inner support block.

[0026] In order to more clearly describe the specific implementation of the utility model, an embodiment is provided below:

[0027] The utility model discloses an auxiliary positioning device for expansion and maintenance of flange-connected valves, which can be used as Figure 2As shown, they are used in pairs to support the symmetrical position of the flange. The positioning process is as follows:

[0028] 1. First, insert the fixed inner support block and the movable inner support block on the symmetrical sides of the flange, and then start the hydraulic cylinder to make the fixed inner support block and the movable inner support block respectively support the axial end faces of the two flanges facing each other; thereby completing the relative fixation of the auxiliary positioning device and the two connecting flanges;

[0029] 2. Loosen and remove the tension bolts fixed by threads on the two connecting flanges. During the removal process, ensure that the end faces of the two connecting flanges are flush;

[0030] 3. Start the hydraulic cylinder slightly, and the hydraulic cylinder drives the movable inner support block to move back to the fixed inner support block. During this process, the movable inner support block slides axially on the sleeve;

[0031] 4. Stop the output of the hydraulic cylinder, and let the construction personnel hold the wrench to rotate the hexagonal nut, and then rotate the whole sleeve until the hexagonal nut is supported on the lower bottom surface of the movable inner support block;

[0032] 5. Repeat steps 3 and 4 until the axial distance between the two connecting flanges meets the replacement requirements of the valve gasket.

[0033] Finally, all the parts not fully described in the present invention adopt mature products and mature technical means in the prior art.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in the embodiments or examples of the utility model.

[0035] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An auxiliary positioning device for expansion and maintenance of flange-connected valves, wherein the auxiliary positioning device is axially supported and positioned on the axial end faces of the connecting flanges at both ends of the valve, and the auxiliary positioning device comprises a screw, a fixed inner support block and a movable inner support block, wherein the fixed inner support block is radially fixed on the screw, and the movable inner support block is axially adjustable and connected on the screw; Features: The threaded sleeve on the screw is connected to a sleeve, the inner wall thread of the sleeve is connected to the circumferential outer wall of the screw, and the outside of the sleeve is made into a smooth outer wall; the movable inner support block is lifted and slidably sleeved on the smooth outer wall of the sleeve, and one end of the movable inner support block is vertically fixed to a hydraulic cylinder; the piston rod of the hydraulic cylinder vertically penetrates the movable inner support block and is supported on the upper surface of the fixed inner support block.

2. The expansion maintenance auxiliary positioning device for flange-connected valves according to claim 1, characterized in that: A hexagonal nut is coaxially fixed to the bottom of the sleeve. The outer diameter of the hexagonal nut is larger than the outer diameter of the sleeve, and the internal thread of the hexagonal nut is sleeved and connected to the screw rod.

3. The expansion maintenance auxiliary positioning device for flange-connected valves according to claim 2, characterized in that: The axial end surface of the top of the hexagonal nut is downwardly limited and overlapped with a movable inner support block.

Images