Plug and end plug for cast pipe hydraulic press

Abstract

The utility model relates to a plug and an end plug for a cast pipe hydraulic press, which comprise a sealing disc which is a metal disc with a plane surface and a conical surface; the first sealing ring groove is positioned on one side of the conical surface of the sealing disc; the second sealing ring groove is positioned on one side of the plane of the sealing disc; elastic sealing pieces are arranged in the first sealing ring grooves and the second sealing ring grooves, and the multiple first sealing ring grooves and the sealing disc are concentric and are arranged in an outward radial mode; compared with the prior art, the sealing device has the advantages that sealing alignment is achieved when the whole cast pipe is bent or the lifting position is not accurate through a guide structure which is integrally in a conical shape at the position where the sealing device is in contact with the end of the cast pipe, and the sealing device is simple in structure, convenient to operate and high in practicability. The service life of the sealing element is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal pipe water pressure testing, and in particular relates to a plug for a cast pipe hydraulic press and an end plugging. Background Art

[0002] The hydraulic testing machine is a device used to perform pressure tests on pipelines, spiral welded pipes, cast pipes and other pipelines. The purpose is to inspect the quality of the pipelines, so as to determine whether the pipelines meet the relevant standards and meet the needs of users. It is a quality inspection equipment suitable for all types of pipeline production companies.

[0003] When testing a pipeline with a hydraulic pressure tester, both ends must be closed, and low-pressure water must be filled into the pipeline through a water filling valve before a high-pressure test is performed. Depending on the diameter of the tested pipeline, the required exhaust pipe length is also different, and the plug must also be replaced during the process of changing the pipeline specification. However, during the test of a fully automatic hydraulic press, manual replacement is cumbersome and time-consuming, and cannot be adjusted, which greatly reduces the test efficiency.

[0004] The inventor discovered during the process of studying the existing flexible (mixed flow production with different pipe diameters) water pressure test technology that during the water pressure test, when the metal pipe cannot be completely concentric with the socket plug after being lifted or when the pipe itself is deformed in the axial direction, pits of different concentricity and depth will be formed on the surface of the sealing ring after a period of use, which will reduce the service life of the rubber ring and cause the rubber ring to fail more quickly. At the same time, when the positioning deviation of the metal pipe is large, due to the relatively small thickness of the metal retaining ring between the two adjacent sealing rings, one side of the socket or spigot of the metal pipe will be pressed on the metal retaining ring between the two adjacent sealing rings, causing damage to the plug or damage to the metal pipe spigot. The above situations will reduce the life of the plug and the sealing ring, increase the product manufacturing cost, and reduce production efficiency.

[0005] Therefore, there is an urgent need for a method to solve the above technical problems, to increase the service life of the plug and the sealing ring, and to overcome the defect of inaccurate position of the metal pipe during the plugging process. Summary of the invention

[0006] In order to overcome the defects of the prior art, the inventor adopts a plugging structure with a conical plugging surface as a whole on the basis of the existing concentric mixed flow production water pressure seal, so as to realize the adaptive grooving of the metal pipe during the plugging process, prolong the service life of the sealing ring, and improve the production efficiency. The technical solution adopted by the utility model is: a plug for a cast pipe hydraulic press, comprising:

[0007] The sealing disk is a metal disk with one side being flat and the other side being conical;

[0008] A first sealing ring groove, located on one side of the conical surface of the sealing disk;

[0009] A second sealing ring groove, located on one side of the plane of the sealing disk;

[0010] Elastic sealing members are arranged in the first sealing ring groove and the second sealing ring groove, and the first sealing ring groove is concentric with the sealing disk and has multiple radially arranged grooves extending outward;

[0011] The plurality of first sealing ring grooves match the end face dimensions of the sockets or spigots of cast pipes of different specifications to be tested by water pressure.

[0012] Furthermore, it also includes:

[0013] A through hole, located at the center of the sealing disk, is a hole that passes through the sealing disk;

[0014] A water filling or exhaust device for water pressure testing passes through the through hole and communicates with the interior of the cast pipe to be tested to complete water filling or exhaust.

[0015] Furthermore, it also includes:

[0016] The lifting part is located on the circumferential side of the sealing disk and is a protrusion protruding outward and cooperating with the lifting device.

[0017] Furthermore, it also includes:

[0018] The fixing portion is located on the circumferential side of the sealing disk, and is a protrusion that protrudes outward and cooperates with the supporting member that fixes the sealing disk in a vertical state.

[0019] Furthermore,

[0020] The fixing parts are provided with more than three groups, and at least one group is located at the bottom when the sealing plate is in a vertical state.

[0021] Furthermore, the first sealing ring groove comprises:

[0022] The first sealing groove wall is an inner wall of a circular protrusion cocentric with the sealing disk;

[0023] The second sealing groove wall is an outer wall of a circular protrusion cocentric with the sealing disk and closer to the center of the sealing disk relative to the first sealing groove wall;

[0024] Based on the side of the sealing disk that is a plane, the second sealing groove wall is higher than the first sealing groove wall.

[0025] Furthermore,

[0026] The first sealing groove wall and the second sealing groove wall are both provided with chamfers at the top of one side close to the groove body;

[0027] The chamfer on the wall of the first sealing groove is 15° to 25°;

[0028] The chamfer on the wall of the second sealing groove is 25° to 35°.

[0029] Furthermore, it also includes:

[0030] The weight-reducing groove is located on one side of the flat surface of the sealing disk and is an inwardly concave groove.

[0031] An end plug for a cast pipe hydraulic press, comprising:

[0032] The blocking part is a vertical support member that is fixed or horizontally movable; and

[0033] The blocking portion is provided with a bolt hole, and the bolt hole cooperates with the fixing portion to fix the sealing disk on the blocking portion, or

[0034] The blocking portion is fixedly connected to a vertical support platform and a horizontal clamping platform on the side facing the cast pipe to be tested;

[0035] The horizontal card platform is provided with two groups in the horizontal direction;

[0036] The vertical support platform and the horizontal clamping platform clamp the sealing disk on the blocking part.

[0037] The beneficial effects of the utility model compared with the prior art are as follows: 1) By utilizing the overall conical guiding structure at the contact position with the end of the cast pipe, the sealing alignment is realized when the cast pipe is bent as a whole or the lifting position is inaccurate, thereby improving the service life of the sealing element; 2) A through hole is arranged in the middle of the sealing disk, which cooperates with the second sealing ring groove to realize the sharing of the same structure of the socket and the plug, and the same position arrangement of the filling and drainage device; 3) The height difference between the first sealing groove wall and the second sealing groove wall realizes that when the corresponding sealing ring position is reached, the inner ring is a high platform, which prevents the cast pipe from having a large deviation and affecting the sealing disk, and facilitates the groove and return to its original position; 4) The chamfering is arranged to improve the convenience of sealing within a small range; 5) The weight-reducing groove reduces the overall weight of the sealing disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a front view of a specific implementation method of the utility model;

[0039] Figure 2 It is the AA cross-sectional view of the specific implementation mode of the utility model;

[0040] Figure 3 This is an enlarged view of the details of the first sealing groove wall and the second sealing groove wall in a specific embodiment of the utility model;

[0041] Figure 4 This is an enlarged view of the details of the second sealing ring groove of the specific implementation method of the utility model;

[0042] Figure 5This is an axial view of a specific implementation method of the utility model;

[0043] Figure 6 This is a front view of the end plugging of the specific embodiment of the utility model as the socket side

[0044] The annotations are:

[0045] 100 - sealing disk; 110 - first sealing ring groove; 111 - first sealing groove wall; 112 - second sealing groove wall; 120 - through hole;

[0046] 130-weight reduction groove; 140-second sealing ring groove;

[0047] 210-hoisting part; 220-fixing part;

[0048] 310-blocking part; 311-vertical support platform; 312-horizontal clamping platform; 320-cast pipe. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model 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 a limitation to the utility model.

[0050] In order to overcome the defects of the existing technology, based on the existing concentric mixed flow production water pressure seal, a sealing structure with a conical sealing surface is adopted to achieve adaptive grooving of the metal pipe during the sealing process, thereby increasing the service life of the sealing ring and improving production efficiency. Figures 1 to 6 The technical solution adopted by the utility model is: a plug for a cast pipe hydraulic press, comprising:

[0051] The sealing disk 100 is a metal disk with one side being flat and the other side being conical;

[0052] A first sealing ring groove 110 is located on one side of the conical surface of the sealing disk 100;

[0053] The second sealing ring groove 140 is located on one side of the plane of the sealing disk 100; see Figure 2 and Figure 4The function of the second sealing ring groove 140 is to seal the back of the sealing disk 100 from the outside of the system when the sealing disk 100 is located in the end plugging system. It should be noted that the positions of the sealing elements in the first sealing ring groove 110 and the second sealing ring groove 140 are different relative to the two. The sealing element in the first sealing ring groove 110 is hidden in the groove and is pressed and sealed when the casting pipe 320 is pressed in. The position of the sealing element in the second sealing ring groove 140 should protrude from the groove body and cooperate with the external supporting environment for sealing.

[0054] See also Figure 1 , elastic seals are disposed in the first sealing ring groove 110 and the second sealing ring groove 140, and the first sealing ring groove 110 is concentric with the sealing disk 100, and multiple sealing rings are radially arranged outward;

[0055] The plurality of first sealing ring grooves 110 match the end face dimensions of the sockets or spigots of the cast pipes 320 of different specifications to be tested by water pressure. Figure 1 In the figure, the sealing disk 100 on the spigot side is taken as an example, but it does not correspond to the specific size of the full-diameter DN80-DN3000 cast pipe spigot in actual application, and is only embodied in a schematic form. In certain specification sections, the difference of the first sealing ring groove 110 corresponding to the spigot is equidistant, but the first sealing ring groove 110 on the socket side is not necessarily equidistant. Those skilled in the art should adjust according to the size of the spigot and the specific situation, or even merge adjacent sealing sections.

[0056] In this specific implementation, please refer to Figure 1 Although there is a technical feature of containing a through hole 120, in some prior arts, a filling and drainage channel can be passed through the first sealing ring groove 110 to achieve the function of filling and draining air.

[0057] In this specific implementation, preferably, it also includes:

[0058] The through hole 120 is located at the center of the sealing disk 100 and is a hole that penetrates the sealing disk 100;

[0059] A water filling or exhaust device for the water pressure test passes through the through hole 120 and communicates with the interior of the cast pipe 320 to be tested to complete the water filling or exhaust.

[0060] The inventor believes that after setting the through hole 120, the technical solution designed in the utility model can be adopted on both sides of the socket, and the conical structure can be used to achieve guidance and locking seal, thereby overcoming the defects in the prior art. Therefore, the conical setting and the arrangement of the socket in a non-first sealing ring groove 110 in structural form are one of the creative contents of the utility model. It also overcomes the defects of the prior art. Although the guiding function of the cone is a form of the prior art, in the water pressure test, the use of the first sealing ring groove 110 is the main inventive concept of the utility model.

[0061] For ease of lifting, see Figure 1 , on the top of the sealing disk 100, further comprising:

[0062] The hanging part 210 is located on the circumferential side of the sealing disk 100, and is a protrusion protruding outward and matching with the hanging device. In this specific embodiment, the structure of the protrusion includes an annular hole for hooking, or other structures matching with the hook, or can even be simply hung in the suspension mechanism set on the upper part, and hung or fixed in the hanging form.

[0063] In some other embodiments, it also includes:

[0064] The fixing portion 220 is located on the circumferential side of the sealing disk 100, and is a protrusion protruding outward and cooperating with the support member that fixes the sealing disk 100 in a vertical state. In this embodiment, in order to facilitate replacement and quick replacement, please refer to Figure 5 A special fixing portion 220 is provided. The fixing portion 220 may be fixed in the form of a bolt. Please refer to Figure 6 In this specific embodiment, the sealing disk 100 is positioned on the support member in a detachable manner by inserting and engaging.

[0065] Preferably, the fixing parts 220 are provided in more than three groups, and at least one group is located at the bottom when the sealing plate 100 is in a vertical state.

[0066] In order to match the tapered structure, in some embodiments, the first sealing ring groove 110 includes:

[0067] The first sealing groove wall 111 is an inner wall of a circular protrusion cocentric with the sealing disk 100;

[0068] The second sealing groove wall 112 is an outer wall of a circular protrusion coaxial with the sealing disk 100 and closer to the center of the sealing disk 100 relative to the first sealing groove wall 111; see Figure 3In order to facilitate the description of technical features, in this application, the structure of the first sealing groove wall 111 and the second sealing groove wall 112 is described. It should be noted that the raised groove wall between two adjacent first sealing ring grooves 110 is shared, that is, the first sealing groove wall 111 and the second sealing groove wall 112 may be located in the same protrusion / partition in different first sealing ring grooves 110.

[0069] Based on the side of the sealing disc 100 being a plane, the second sealing groove wall 112 is higher than the first sealing groove wall 111. The above technical feature is based on the overall tapered shape, and utilizes the overall tapered guide structure at the contact position with the end of the cast pipe to achieve sealing alignment when the cast pipe is bent or lifted inaccurately, thereby improving the service life of the sealing element, which is also another innovation of the utility model.

[0070] Preferably, in order to improve the guiding effect,

[0071] The first sealing groove wall 111 and the second sealing groove wall 112 are both provided with chamfers at the tops of the sides close to the groove body;

[0072] The chamfer angle on the first sealing groove wall 111 is 15° to 25°;

[0073] The chamfer of the second sealing groove wall 112 is 25° to 35°. The second sealing groove wall 112 is set at a larger angle, so that the second sealing groove wall 112 is more conducive to the end of the casting pipe 320 entering than the first sealing groove wall 111, so in the sealing process, a natural choice is formed, and when misalignment occurs, it is easier to fall into the groove under the guidance of the second sealing groove wall 112.

[0074] Although the chamfers of the first sealing groove wall 111 and the second sealing groove wall 112 belong to the prior art, the corresponding angles are different from the conventional 45° chamfers of the prior art, which are obtained by the inventor through a large number of experiments. Under the premise of maintaining the existing rigidity of the sealing disk 100, differentiated chamfers are provided to achieve more convenient placement.

[0075] Preferably, it also includes:

[0076] The weight-reducing groove 130 is located on the flat side of the sealing disk 100 and is an inwardly concave groove. It should be noted that the outer wall of the groove in the present application is not necessarily angular or stepped, and the inwardly concave groove can also be an arc, which should be within the protection scope of the present application under the premise of satisfying rigidity and weight reduction.

[0077] Based on the use of the sealing disk 100, the inventors designed an end plugging, which is mainly one side of the hydraulic system plugging, and can be any side of the socket, but in this specific embodiment, it is described with the socket side, and the technical solution adopted is: an end plugging for a cast pipe hydraulic press, comprising:

[0078] The blocking part 310 is a vertical support member that is fixed or horizontally movable; the function of the blocking part 310 is to support the sealing disk 100 and the casting pipe 320. Generally, in a water pressure test, one end is fixed and the other end is movable. Of course, in some examples, both ends may be movable. However, there is no situation where both ends are fixed.

[0079] as well as

[0080] The blocking portion 310 is provided with a bolt hole, and the bolt hole cooperates with the fixing portion 220 to fix the sealing disk 100 on the blocking portion 310, or

[0081] The blocking portion 310 is fixedly connected to a vertical support 311 and a horizontal clamping platform 312 on the side facing the casting pipe 320 to be tested;

[0082] The horizontal card platform 312 is provided with two groups in the horizontal direction;

[0083] The vertical support platform 311 and the horizontal clamping platform 312 clamp the sealing disk 100 on the blocking portion 310 .

[0084] In this embodiment, two detachable fixing methods are implemented, one is fixing with bolts, and the other is placing in the form of a card table. The above two technical solutions are both for the purpose of rapid replacement. Relatively speaking, the second technical solution is more convenient.

[0085] Specific implementation method: Before the hydraulic test, the cast pipe 320 is pushed or transported to the middle of the hydraulic tester by using a supporting device, and the socket and the spigot are initially opposite to the sealing disk 100, and the blocking parts 310 on one or both sides move inward to clamp the cast pipe 320. At the same time, if there is a small deviation in the position of the cast pipe 320, under the guidance of the conical structure and the first sealing groove wall 111 and the second sealing groove wall 112, the above defects will be overcome and the sealing element will be contacted in a straight state, and no large deflection will be generated, which will reduce the service life of the sealing element. Then, the medium is flushed into the cast pipe 320, and the exhaust is exhausted to maintain the pressure. The blocking parts 310 on both sides are relatively separated to complete the hydraulic test.

[0086] Compared with the prior art, the utility model has the following beneficial effects: a conical guiding structure is used at the contact position with the end of the cast pipe to achieve sealing alignment when the cast pipe is bent or lifted to an inaccurate position as a whole, thereby improving the service life of the sealing element; a through hole is set in the middle of the sealing disk, which cooperates with the second sealing ring groove to achieve the sharing of the same structure of the socket and the plug, and the same position setting of the filling and drainage device; the height difference between the first sealing groove wall and the second sealing groove wall is achieved when the corresponding sealing ring position is reached, the inner ring is a high platform, which prevents the cast pipe from having a large deviation and affecting the sealing disk, and facilitates the groove and return to its original position; the chamfer is set to improve the convenience of sealing within a small range; the weight-reducing groove reduces the overall weight of the sealing disk.

[0087] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plug for a cast pipe hydraulic press, characterized in that: include: The sealing disk (100) is a metal disk having a flat surface on one side and a conical surface on the other side; A first sealing ring groove (110) is located on one side of the conical surface of the sealing disk (100); A second sealing ring groove (140) is located on one side of the plane of the sealing disk (100); Elastic sealing members are disposed in both the first sealing ring groove (110) and the second sealing ring groove (140), and the first sealing ring groove (110) is cocentric with the sealing disk (100) and has a plurality of radially arranged grooves extending outwards; The plurality of first sealing ring grooves (110) match the dimensions of the socket or spigot end faces of cast pipes (320) of different specifications to be subjected to water pressure testing.

2. The plug for a cast pipe hydraulic press according to claim 1, characterized in that: Also includes: A through hole (120), located at the center of the sealing disk (100), and being a hole that penetrates the sealing disk (100); A water filling or exhaust device for a water pressure test passes through the through hole (120) and communicates with the interior of the cast pipe (320) to be tested, thereby completing water filling or exhaust.

3. The plug for a cast pipe hydraulic press according to claim 1, characterized in that: Also includes: The hanging portion (210) is located on the circumferential side of the sealing disk (100) and is a protrusion protruding outwards and cooperating with the hanging device.

4. The plug for a cast pipe hydraulic press according to claim 1, characterized in that: Also includes: The fixing portion (220) is located on the circumferential side of the sealing disk (100), and is a protrusion protruding outwards and cooperating with a support member that fixes the sealing disk (100) in a vertical state.

5. The plug for a cast pipe hydraulic press according to claim 4, characterized in that: The fixing parts (220) are provided in more than three groups, and include at least one group located at the bottom when the closing plate (100) is in a vertical state.

6. The plug for a cast pipe hydraulic press according to claim 1, characterized in that: The first sealing ring groove (110) comprises: The first sealing groove wall (111) is an inner wall of a circular protrusion cocentric with the sealing disk (100); The second sealing groove wall (112) is an outer wall of a circular protrusion cocentric with the sealing disk (100), and is closer to the center of the sealing disk (100) relative to the first sealing groove wall (111); Based on one side of the sealing disk (100) being a plane, the second sealing groove wall (112) is higher than the first sealing groove wall (111).

7. The plug for a cast pipe hydraulic press according to claim 6, characterized in that: The first sealing groove wall (111) and the second sealing groove wall (112) are both provided with chamfers at the tops of one side close to the groove body; The chamfer on the first sealing groove wall (111) is 15° to 25°; The chamfer on the second sealing groove wall (112) is 25° to 35°.

8. The plug for a cast pipe hydraulic press according to claim 1, characterized in that: Also includes: The weight-reducing groove (130) is located on one side of the flat surface of the sealing disk (100) and is an inwardly concave groove.

9. An end plug for a cast pipe hydraulic press, characterized in that: Including the plug for cast pipe hydraulic press according to claim 4 or 5; It also includes: a blocking portion (310), which is a vertical support member that is fixed or horizontally movable; and The blocking portion (310) is provided with a bolt hole, and the bolt hole cooperates with the fixing portion (220) to fix the sealing disk (100) on the blocking portion (310), or The blocking portion (310) is fixedly connected to a vertical support platform (311) and a horizontal clamping platform (312) on the side facing the casting pipe (320) to be tested; The horizontal card platforms (312) are provided with two groups in the horizontal direction; The vertical support platform (311) and the horizontal clamping platform (312) clamp the sealing disk (100) on the blocking portion (310).

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