High-pressure connector of large free forging hydraulic press and using method

Abstract

The invention relates to the technical field of forging equipment, and discloses a high-pressure connector of a large free forging hydraulic press and a using method. The main body is of an integrated structure and comprises a circular pipe connector, a first flange and a second flange, sealing grooves are symmetrically formed in the ends, away from the circular pipe connector, of the first flange and the second flange; the pressing assembly comprises two third flanges and a connecting piece set. At least two through holes which are symmetrical about the circular pipe joint and are matched with the connecting piece group are formed in the two third flanges in a penetrating manner; and the connecting piece group is used for penetrating through the through holes to symmetrically mount the two third flanges at the second flange end of the main body. According to the scheme, the main pump-main valve block high-pressure connector integrally-formed main body eliminates weld joints, the problem of leakage caused by the weld joints can be completely avoided, and the overall strength and durability can be enhanced; the length and the planeness of the two ends are easy to process and correct, and the adaptability is better; the combined pressing assembly does not affect main stress, and the assembling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of forging equipment, and in particular to a high-pressure joint of a large-scale free forging hydraulic press and a use method thereof. Background Art

[0002] Large free forging hydraulic press refers to hydraulically driven forging equipment with a nominal capacity greater than 70MN, which uses steel ingots and billets as raw materials and adopts free forging technology to produce large forgings. High-pressure pipe joints are transitional joint components that connect the high-pressure valve block and the high-pressure oil outlet pipeline in the hydraulic system pipeline of the hydraulic press. They play the role of connection and sealing. The design requires that the high-pressure joints must ensure the smooth flow of high-pressure oil without causing leakage.

[0003] However, in actual use, the 35MPa system pressure of this type of press and the frequent forging vibrations and hydraulic shocks often cause equipment shutdowns due to oil leakage, especially leakage of high-pressure pipelines and their high-pressure joints, which not only causes a lot of cost waste, but also affects production continuity and product quality.

[0004] After analysis, the existing high-pressure pipe connection is as follows Figure 1 As shown, it includes the existing standard flange 100, the existing square flange round pipe 200 and the existing clamping piece 300, which are assembled and welded, namely, material preparation - groove opening - pre-welding treatment (deburring, cleaning of oil stains and rust, etc.) - fitter assembly - argon arc spot welding - argon arc rotation flat welding - flaw detection. The fitter installs the clamping flange inside the standard flange and square flange round pipe, and then the welder welds the standard flange and square flange round pipe into a whole. After completion, the clamping flange can move up and down along the inner hole. The existing structural characteristics after completion are poor in machinability because the clamping flange can move left and right, and the flange size is larger than the flange size at both ends. Moreover, the welding quality during the manufacturing process directly affects the service life of the component. It usually requires professionally qualified welding technicians and specialized welding equipment to complete the task. The manufacturing is difficult and the threshold is high. It is difficult to ensure the stability of the component quality by manual control. The assembly state and thermal deformation during welding affect the parallelism of the upper and lower end surfaces of the component and the length of the component, making it difficult to ensure the efficiency and quality of the assembly between the output oil pipe and the valve block. The entire manufacturing and assembly process is time-consuming and labor-intensive, and the labor cost is high. According to statistics, the leakage caused by the damage of the weld of the existing high-pressure pipe joints and the leakage caused by the failure to tighten the plane seal at the connection between the high-pressure valve block and the high-pressure oil outlet pipeline are the main reasons for the failure of high-pressure pipe joints. Summary of the invention

[0005] The present invention aims to provide a large-scale free forging hydraulic press high-pressure joint and a use method, which are used to solve the technical problems of the existing high-pressure pipe joints, such as complicated assembly, low assembly efficiency and quality, and easy oil leakage during use.

[0006] The basic scheme provided by the present invention is: a high-pressure joint of a large-scale free forging hydraulic press, comprising a main body and a clamping assembly;

[0007] The main body is an integrated structure, including a circular pipe joint and a first flange and a second flange formed at both ends of the circular pipe joint; the first flange and the second flange are symmetrically provided with sealing grooves at one end away from the circular pipe joint;

[0008] The clamping assembly includes two third flanges and a connecting member group; at least two through holes are penetrated through the two third flanges, and at least two through holes are symmetrical with circular pipe connections and adapted to the connecting member group; the connecting member group is used to pass through the at least two through holes to symmetrically and integrally install the two third flanges on the second flange end of the main body.

[0009] The present invention is based on a large-scale free forging hydraulic press high-pressure joint, and also provides a method for using the large-scale free forging hydraulic press high-pressure joint. The large-scale free forging hydraulic press high-pressure joint is installed between the high-pressure valve block and the main pump output oil pipe. The method comprises:

[0010] S100, placing the first flange end face of the main body at the assembly center of the valve block, pressing the installation end of the main pump output oil pipe downward to contact the second flange end face of the main body, and measuring the target length of the main body;

[0011] S200, use a common lathe to process the two end faces of the main body and the corresponding sealing grooves so that the main body length and the sealing groove dimensions meet the target installation requirements;

[0012] S300, assembling the two third flanges into the main body, the connecting member group passes through the two through holes and the two third flanges at the same time, and the two third flanges are symmetrically and integrally mounted on the second flange end of the main body;

[0013] S400, install matching flat seals in both sealing grooves;

[0014] S500 is installed by tightly connecting the first flange end of the main body and its flat seal with the high-pressure valve block; the main pump output oil pipe is pressed down and is installed by tightly connecting the two third flanges as a whole and the corresponding flat seal with the main pump output oil pipe.

[0015] The working principle and advantages of the present invention are:

[0016] The high-pressure joints used in large free forging hydraulic presses are difficult to process with ordinary equipment because they have a clamping flange in the middle that is restricted in freedom but can move up and down, and the inner hole size of the flange is larger than the size of the flanges at both ends. Traditionally, they are manufactured by purchasing SAE flanges for assembly and welding. Since the joint needs to connect the high-pressure valve block and the main pump output oil pipe, there may be structural differences. Assembly welding can provide flexibility to adapt to different size and shape requirements, making it easier for manufacturers to adjust the design. In addition, the end structure of the connection between the high-pressure valve block and the output oil pipe can actually be processed with the help of existing mature equipment, and the welding process has become very mature and stable after years of development. Therefore, it is traditionally believed that the existing mature technology can ensure the reliability, safety and flexible adjustment of the structure of the assembled welded joints under high-pressure environments.

[0017] However, in actual applications, the high-pressure valve block is fixed on the equipment and cannot be moved, and the other end of the output oil pipe is also connected to other parts of the equipment, resulting in limited freedom. Under this layout, the length of the high-pressure joint and the flatness of both ends are crucial to assembly efficiency and quality. Under the specific conditions of the above layout, the quality control of assembly welding faces challenges. Although modern welding processes can keep the length error within a certain range, this error range has uncertain fluctuations due to welding thermal deformation, and may still exceed the certain accuracy requirements required for the connection of high-pressure joints (high-pressure joints are all made in batches, and a press has up to a dozen connection parts, each of which is an independent individual. There are large differences between individuals due to the use environment and temperature. In the actual assembly process, the length of each joint needs to match the assembly length of the part), which ultimately affects the actual assembly efficiency and quality, and further affects the performance and safety of the joint. In addition, the roughness of the inner wall of the weld and the inner wall of the pipe is very different, and it is easy to be damaged by the high-speed and high-pressure flow impact and vibration of 30MPa and above hydraulic oil. In the short term, although the assembly welding method has the advantages of low cost and high flexibility compared to one-piece molding, the change from assembly welding to one-piece molding process has the disadvantage of high initial cost. However, in the long term, the high-pressure joint with an integrated structure has more beneficial practical research significance.

[0018] This solution deeply analyzes the manufacturing process, installation and maintenance, and cost-effectiveness. While meeting the connection requirements of the high-pressure valve block and the high-pressure oil outlet pipeline in the hydraulic system pipeline of a conventional hydraulic press, it cleverly combines the clamping component flange through a joint assembly method to achieve rapid construction of the one-piece molding equipment of the main load-bearing parts, optimize the structure, take into account the rationality of the integrated main structure length and pipeline force, and balance the production cost and process complexity at the same time.

[0019] Compared with traditional assembly welded parts, the circular pipe connection, the first flange and the second flange of the main force-bearing component of this solution are made as a whole, and the main force-bearing components are formed into one piece at one time, avoiding the process of multiple components being processed separately and then welded in the traditional method, thereby greatly reducing the process steps and improving production efficiency. The main body is an integrated structure, and the blank is forged. It can be processed and formed by ordinary lathes, milling machines, and drilling machines, which is relatively easy to make. The two end faces can also be processed and corrected to control the overall length of the component and the parallelism between the two end faces and the size of the sealing groove, which is more conducive to the assembly and compression quality of the two end plane seals, and reduces the risk of oil leakage due to the seal not being compressed or the seal being damaged by uneven force. The forging body improves the tensile and crack resistance of the main body.

[0020] More importantly, one-piece forming can eliminate the existence of welds and potential quality risks that may occur during welding, such as cracks, pores and other defects. It can completely avoid the problem of weld leakage, better control the consistency and uniformity of the internal structure of the material, help improve the mechanical properties, and make the finished product have higher fatigue resistance and better toughness, making the product more reliable and stable when subjected to high pressure and high vibration, which is crucial for hydraulic systems that are under high pressure working conditions for a long time. It improves the roughness of the inner wall of the main body, further improves the permeability of high-pressure oil in the main body, and prevents the risk of the component being broken due to high pressure and high vibration. In addition, due to the absence of welds, the one-piece high-pressure joint exhibits better resistance to corrosive media or temperature changes, extending its service life. At the same time, it reduces or even eliminates the need for post-weld heat treatment, reduces energy consumption, and simplifies the subsequent inspection process because there is no need for special quality inspection of the weld area.

[0021] Although one-piece molding may involve higher initial equipment investment and technology research and development costs, in the long run, the quality improvement, maintenance cost reduction and higher safety factor it brings have brought significant economic and social benefits to enterprises. With the advancement of technology and the emergence of economies of scale, the cost advantage of one-piece molding will gradually become prominent and become an important force to promote industry upgrading.

[0022] In addition, after removing the two third flanges in the middle of the high-pressure joint with an integrated structure of this scheme, the two ends of the main body and the sealing groove can be processed and corrected by an ordinary lathe, so as to better control the flatness of the end face of the joint and the parallelism between the two end faces, improve the assembly stability, and better control the overall length. The assembly dimensions can be modified according to the actual needs of the site, thereby improving the assembly efficiency and quality; the clamping component is designed as a combined structure, which does not affect the main force conditions and can improve the assembly efficiency. More importantly, on the basis of optimizing the main body into an integrated structure, the size of the clamping component is optimized to balance the force at the connection and the main body itself, thereby improving the performance of the joint. The overall structure is simple, manufacturable, widely applicable, reusable, low cost, easy to install and disassemble, and efficient when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an existing high-pressure pipe connection;

[0024] Figure 2 A schematic structural diagram of a high-pressure joint for a large-scale free forging hydraulic press provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure and dimensions of the third flange provided in an embodiment of the present invention;

[0026] Figure 4 A schematic cross-sectional view of the structure and dimensions of a third flange provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the assembly of a high-pressure joint of a large-scale free forging hydraulic press provided by an embodiment of the present invention;

[0028] Figure 6 It is an assembly cross-sectional view of an existing high-pressure pipe connection;

[0029] Figure 7 A schematic flow chart of a method for using a high-pressure joint of a large free forging hydraulic press provided in an embodiment of the present invention.

[0030] The marks in the drawings of the specification include: existing standard flange 100, existing square flange circular pipe connection 200, existing clamping piece 300, main body 1, circular pipe connection 11, first flange 12, second flange 13, third flange 2, through hole 21, connecting piece group 3, sealing groove 4, high-pressure valve block 5, output oil pipe 6, clamping bolt 7, flat seal 8, clamping flange 9. DETAILED DESCRIPTION

[0031] The following is a further detailed description through specific implementation methods:

[0032] The embodiment is basically as shown in the attached Figure 2As shown: A high-pressure joint for a large free forging hydraulic press, comprising a main body 1 and a clamping assembly;

[0033] The main body 1 is an integrated structure, including a circular pipe connection 11 and a first flange 12 and a second flange 13 formed at both ends of the circular pipe connection 11. In this embodiment, along the axial direction of the circular pipe connection 11, the length of the main body 1 can be 227-240 mm, which is suitable for various existing connection assembly scenarios; the first flange 12 has an SAE flange end structure, and the length of the first flange 12 along the axial direction of the circular pipe connection 11 can be 33 mm; the second flange 13 has a square flange end structure, and the length of the second flange 13 along the axial direction of the circular pipe connection 11 can be 29 mm; along the direction perpendicular to the axial direction of the circular pipe connection 11, the width of the first flange 12 and the second flange 13 can be 110 mm; the outer diameter of the circular pipe connection 11 can be 76 mm, and the inner diameter can be 50 mm; the reasonable selection of this set of dimensional data ensures that the high-pressure connector of this solution is adapted to be installed between the high-pressure valve block 5 and the output oil pipe 6. In the application scenario with a special position, the length of the integrated structure is determined to be appropriate, while taking into account the balanced force, and optimizing the overall performance and safety. In other embodiments, other structural flanges and sizes of the circular pipe joint 11 may be adapted and selected according to different application scenarios and the structure of the connection point of the connection object.

[0034] The first flange 12 and the second flange 13 are symmetrically provided with sealing grooves 4 at one end away from the circular pipe connection 11. The diameter of the sealing groove 4 is larger than the inner diameter of the circular pipe connection 11, and the diameter difference is 25-35 mm. In this embodiment, the diameter difference is 30 mm. When in use, a plane seal 8 adapted to the sealing groove 4 is installed in the sealing groove 4 to ensure effective sealing with the connection object during use. In other embodiments, the diameter of the sealing groove 4 is adapted and selected according to the size of the first flange 12 and the second flange 13 and the connection structure of the connection object.

[0035] The clamping assembly includes two third flanges 2 and a connecting piece group 3; at least two through holes 21 are penetrated through the two third flanges 2, and the at least two through holes 21 are symmetrical with the circular pipe connection 11 and adapted to the connecting piece group; the axis of the through hole 21 is perpendicular to the axis of the circular pipe connection 11.

[0036] In this embodiment, the third flange 2 is a square pressure flange block, such as Figure 3 and Figure 4 As shown, the total length L1 of the two square pressure flange blocks can be 150-250 mm, preferably 200 mm, the total width W1 can be 150 mm, and the thickness H1 can be 55 mm. During installation, the third flange 2, i.e., the square pressure flange block, contacts the circular pipe joint 11 and the second flange 13 at the same time, and its interior is as shown in FIG. Figure 4As shown, the portion R2 in contact with the second flange 13 can be 111mm, and the diameter of the second flange 13 is 110mm, with a 1mm gap, which is convenient for assembly, H2 is 25mm, and the height of the portion in contact with the circular pipe connection 11 is H1-H2, which can be 30mm, R3 can be 77mm, and the outer diameter of the circular pipe connection 11 is 76mm, with a 1mm gap, which is convenient for assembly; the square pressure flange block itself has four symmetrical screw holes for connecting the output oil pipe 6 flange through connecting bolts to ensure that the output oil pipe 6 and the high-pressure joint are reliably and stably installed, the distance D1 can be 102mm, and D2 can be 102mm. The through hole 21 of this solution does not interfere with the screw hole, and the four symmetrical screw holes are located between the two through holes 21. The distance D3 between the two through holes 21 can be 160mm, and R1 can be 18mm. This size data is reasonably designed. Figure 5 and Figure 6 As shown in the comparison, a lengthened and widened design is performed on the basis of the clamping structure of the existing high-pressure joint. When the second flange 13 is installed on the external structure (i.e., the output oil pipe 6) using the clamping flange 9, the total assembly length and thickness of the third flange 2 described in the two pieces of this solution are greater than the total length and thickness of the clamping flange 9. When the hydraulic oil passes through this connection, the clamping assembly is lengthened and thickened, which can improve the stability and sealing of the connection. At the same time, due to the larger contact area and stronger structural strength, it can better disperse stress and withstand higher internal pressure or external loads, reduce stress concentration and leakage risks, thereby enhancing the safety and durability of the overall system.

[0037] The connecting member group 3 is used to pass through at least two through holes 21 to symmetrically mount the two third flanges 2 on the second flange 13 end of the main body 1. In this embodiment, there are two through holes 21, and the connecting member group 3 includes two pin connecting bolts. The two groups of pin connecting bolts each pass through a through hole 21 and penetrate the two third flanges 2 at the same time, fixing the two third flanges 2 to form a clamping assembly as a whole.

[0038] like Figure 7 As shown, based on the above-mentioned large-scale free forging hydraulic press high-pressure joint, the present solution also provides a method for using the large-scale free forging hydraulic press high-pressure joint, wherein the above-mentioned large-scale free forging hydraulic press high-pressure joint is installed between the high-pressure valve block 5 and the main pump high-pressure output oil pipe 6; the method comprises:

[0039] S100, place the end face of the first flange 12 of the main body 1 at the assembly center of the valve block, press the installation end (sealing contact surface) of the main pump high-pressure output oil pipe 6 downward to contact the end face of the second flange 13 of the main body 1, and measure the target length of the main body 1;

[0040] S200, machining two end faces of the main body 1 and the corresponding sealing groove 4 by a common lathe, so that the length of the main body 1 and the size of the sealing groove 4 meet the target installation requirements;

[0041] S300, assemble the two third flanges 2 into the main body 1, the connecting member group passes through the two through holes 21 and the two third flanges 2 at the same time, and the two third flanges 2 are symmetrically and integrally installed on the second flange 13 end of the main body 1; in this embodiment, the pin connection bolt passes through the through hole 21, and the square pressure flange block on the corresponding side is assembled to the main body 1; inside the main body 1, that is, Figure 2 As shown, the main body 1 is an "I"-shaped structure in the middle of the two horizontal lines and on the two vertical sides of the "I"-shaped structure. If the two third flanges are assembled, the inner hole is smaller than the two ends of the "I"-shaped structure and cannot be inserted. Therefore, the two third flanges are first installed into the interior of the "I"-shaped main body, and then the pin connecting bolts are installed to assemble the two third flanges into a whole. In this way, the two third flanges form a clamping flange, which can only move inside the "I"-shaped main body 1.

[0042] S400, installing matching flat seals 8 in the two sealing grooves 4;

[0043] S500, tightly install with the high-pressure valve block 5 through the first flange 12 and its plane seal; press down the main pump output oil pipe 6, and tightly install with the output oil pipe 6 through the second flange 13 and its plane seal. In this embodiment, the high-pressure joint is installed on the main valve block with connecting bolts, and the extrusion force of the high-pressure valve block 5 and the SAE flange of the high-pressure joint firmly presses the corresponding plane seal to achieve the sealing effect of the connection part, and the main pump output oil pipe 6 is pressed down, and the high-pressure joint and the flange of the main pump output oil pipe 6 are firmly connected by connecting bolts through the two third flanges 2 as a whole, and the extrusion force of the output oil pipe 6 and the square flange of the high-pressure joint firmly presses the corresponding plane seal to achieve the sealing effect of the connection part, thereby ensuring that the high-pressure oil from the main pump passes through the high-pressure valve block 5 and the high-pressure joint, and is distributed to the output oil pipe 6, and then flows to the equipment.

[0044] The embodiment provides a large-scale free forging hydraulic press high-pressure joint and a method of use. Compared with the traditional assembly welded parts, the main force-bearing component SAE flange and the square flange round pipe are made as a whole, which has higher strength and longer service life. The length of the high-pressure joint and the flatness of both ends can be processed and corrected, the parallelism of both ends is better, the assembly stability is better, and the overall length can be better controlled. It can be modified according to the actual assembly size on site, thereby improving the assembly efficiency and quality; the clamping component is designed as a modular structure, which does not affect the main force conditions and can improve the assembly efficiency. The overall structure is simple, the manufacturability is strong, the applicability is wide, and it can be reused, the cost is low, and it is easy to install and disassemble when in use, and the efficiency is high.

[0045] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A high-pressure joint for a large free forging hydraulic press, characterized in that: It includes a main body and a clamping assembly; The main body is an integrated structure, including a circular pipe joint and a first flange and a second flange formed at both ends of the circular pipe joint; the first flange and the second flange are symmetrically provided with sealing grooves at one end away from the circular pipe joint; The clamping assembly includes two third flanges and a connecting member group; at least two through holes are penetrated through the two third flanges, and at least two through holes are symmetrical with circular pipe connections and adapted to the connecting member group; the connecting member group is used to pass through the at least two through holes to symmetrically and integrally install the two third flanges on the second flange end of the main body.

2. A large-scale free forging hydraulic press high-pressure joint according to claim 1, characterized in that: The first flange has a SAE flange end structure.

3. A large-scale free forging hydraulic press high-pressure joint according to claim 1, characterized in that: The second flange has a square flange end structure.

4. A large-scale free forging hydraulic press high-pressure joint according to claim 1, characterized in that: The third flange is a square pressure flange block.

5. A large-scale free forging hydraulic press high-pressure joint according to claim 1, characterized in that: When the second flange is installed on the external structure by means of the clamping flange, the total assembled length and thickness of the two third flanges are greater than the total length and thickness of the clamping flange; the total assembled length of the two third flanges is 150-250mm.

6. A large-scale free forging hydraulic press high-pressure joint according to claim 1, characterized in that: The connecting piece group includes two pin connecting bolts.

7. A large-scale free forging hydraulic press high-pressure joint according to claim 1, characterized in that: When the two third flanges are symmetrically mounted on the second flange end of the main body, the third flanges contact the circular pipe joint and the second flange at the same time.

8. The high-pressure joint for a large-scale free forging hydraulic press according to claim 1, characterized in that: The axis of the through hole is perpendicular to the axis of the circular pipe joint.

9. A large-scale free forging hydraulic press high-pressure joint according to claim 1, characterized in that: Also included is a flat seal that fits into the sealing groove.

10. A method for using a high-pressure joint of a large free forging hydraulic press, characterized in that: Installing a high-pressure joint of a large-scale free forging hydraulic press as described in any one of claims 1 to 9 between a high-pressure valve block and an output oil pipe of a main pump; the method comprising: S100, placing the first flange end face of the main body at the assembly center of the valve block, pressing the installation end of the main pump output oil pipe downward to contact the second flange end face of the main body, and measuring at least the target length of the main body; S200, use a common lathe to process the two end faces of the main body and the corresponding sealing grooves so that the main body length and the sealing groove dimensions meet the target installation requirements; S300, assembling the two third flanges into the main body, the connecting member group passes through the two through holes and the two third flanges at the same time, and the two third flanges are symmetrically and integrally mounted on the second flange end of the main body; S400, install matching flat seals in both sealing grooves; S500 is installed by tightly connecting the first flange end of the main body and its flat seal with the high-pressure valve block; the main pump output oil pipe is pressed down and is installed by tightly connecting the two third flanges as a whole and the corresponding flat seal with the main pump output oil pipe.

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