Pressure relief device for pressure control of cubic press

Abstract

The invention discloses a pressure relief device for pressure control of a cubic press, which belongs to the technical field of presses and comprises hinge beams and hydraulic pipelines, the six hinge beams of the cubic press are assembled and combined, each hinge beam is provided with one hydraulic pipeline in a matched manner, and the hydraulic pipelines comprise an oil supply pipeline, a pressure relief pipeline and an energy release pipeline. A cylinder bottom is installed at the bottom of a cylinder body of the hinge beam, a working cylinder is arranged on the outer side of the cylinder bottom, a guide sleeve is arranged on the upper portion of the working cylinder, and an oil injection hole is formed in the outer side of the guide sleeve. The energy release pipe oil way with the small inner diameter is connected outside the pressure release pipeline arranged on the lower pipe connector at the bottom of the hinge beam in parallel, tiny adjustment of oil pressure in the cylinder diameter can be achieved, dynamic energy release is carried out, the pressure release oil way is used during pressure release, and the dynamic energy release oil way is used during dynamic adjustment control. The pipeline flux diameter of the energy release pipe is 1 / 5-1 / 10 of the flux diameter of the main pressure release pipe, so that the oil cylinder has a good pressure regulating effect in energy release.

Description

Technical Field

[0001] The invention belongs to the technical field of top presses, and in particular relates to a pressure relief device for pressure control of a six-sided top press. Background Art

[0002] Artificial diamond refers to diamond materials synthesized by artificial methods. Compared with natural diamonds, artificial diamonds have the advantages of low cost and strong controllability, showing great potential in industrial applications. Since the first successful synthesis in the 1950s, artificial diamond technology has experienced rapid development and has now become a key material in many fields such as high-performance tools, precision machining, and semiconductor devices. In the synthesis process of artificial diamond, pressure control plays a decisive role in the synthesis effect. At present, the synthetic equipment for artificial diamond is mainly a six-sided top press. The six-sided top press mainly uses a supercharger or an ultra-high pressure oil pump to increase the system pressure to 100Mpa to drive six working cylinders for pressing. After the pressing process is completed, the lower chamber of the supercharger or the ultra-high pressure oil pump needs to be depressurized. The pressure relief process starts from 100Mpa and ends at 6Mpa. When the six-sided top press releases the pressure to below 6MPa, the pressure relief work ends and the six-sided top press turns to the return action.

[0003] In order to control the oil pressure in the hinge beam cylinder, the six-sided top press is usually equipped with a pressure relief pipeline. In order to achieve a good pressure relief effect, the diameter of the pressure relief oil pipeline is usually larger, and the dynamic pressure replenishment and pressure relief speed is fast. However, for the operation process of stabilizing and fine-tuning the pressure, the pressure relief pressure of the pressure relief valve cannot be adjusted casually during the operation after the pressure relief pressure is set, so it is difficult to fine-tune the pressure. At the same time, the existing pipe joints have a simple structure and are only used for connection between pipelines. They cannot effectively buffer the oil pressure in the pipeline, and the rapid increase in oil pressure has a greater impact on the pipe joints. In view of this, the present invention is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a pressure relief device for pressure control of a six-sided top press. To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is: A pressure relief device for pressure control of a six-sided top press comprises a hinge beam and a hydraulic pipeline. The six-sided fixed press is assembled and combined with six hinge beams, each of which is equipped with a hydraulic pipeline. The hydraulic pipeline comprises an oil supply pipeline, a pressure relief pipeline and an energy release pipeline. A cylinder bottom is installed at the bottom of the cylinder body of the hinge beam, a working cylinder is arranged on the outside of the cylinder bottom, a guide sleeve is arranged on the upper part of the working cylinder, an oil filling hole is arranged on the outside of the guide sleeve, a side pipe joint is installed on the outside of the oil filling hole, a plug is installed in the bottom hole of the hinge beam, a sealing connection seat is installed at the lower end of the plug, a lower pipe joint is installed on one side of the sealing connection seat, and a vent plug is installed on the other side, the side pipe joint is connected to one of the oil outlet interfaces of the electromagnetic reversing valve through a side oil supply pipe, one oil inlet end of the electromagnetic reversing valve is connected to a liquid suction pump through a pipeline, and the lower pipe joint is connected to the other end of the electromagnetic reversing valve through the lower oil supply pipe The oil outlet interface is connected, and a pressure relief pipeline is connected at the lower oil supply pipe, and the pressure relief pipeline includes two parallel pipelines, one of which is equipped with a solenoid valve 1, and the other is equipped with a solenoid valve 2 and a relief pressure reducing valve. At the same time, an energy release pipeline is arranged in parallel on the pressure relief pipeline, and an energy release solenoid valve is installed on the energy release pipe of the energy release pipeline. A pressure relay is connected to the outside of the pressure relief pipeline, and the liquid outlet ends of the pressure relief pipeline and the energy release pipeline are connected to the cooler. The cooler is connected to the return oil filter through a pipeline, and the liquid outlet end of the return oil filter extends into the oil tank. A mounting hole is arranged at the upper end of the plug, and the mounting hole is a stepped hole structure. A flow control core is arranged in the mounting hole, and a guide hole is arranged in the flow control core. A guide cone hole is arranged at the upper end of the guide hole. The side pipe joint has the same structure as the lower pipe joint. A valve core is arranged at the upper position of the side pipe joint, and an oil inlet buffer mesh plate is arranged at the lower position.

[0005] As a further solution of the present invention: the guide hole is a tapered hole structure that is larger at the top and smaller at the bottom, a filling hole is arranged at the center of the plug, the lower end diameter of the guide hole is the same as the diameter of the filling hole, the upper end diameter of the guide hole is the same as the lower end diameter of the guide cone hole, the taper of the guide cone hole is greater than the taper of the guide hole, so as to ensure smooth filling and diversion.

[0006] As a further solution of the present invention: the valve core is connected to the main body of the side pipe joint through a fine pitch thread, and a plurality of sealing grooves are arranged on the thread outer diameter of the valve core. A sealing ring 2 is installed in the sealing groove, and a sealing outer cone surface is arranged on the outer side of the sealing ring 2. The sealing outer cone surface has a structure that is larger at the top and smaller at the bottom, which will not affect the threaded connection and can enhance the sealing performance of the threaded connection.

[0007] As a further solution of the present invention: an oil hole is arranged at the center position of the valve core, a plug-in groove is opened on the upper plane of the valve core, the plug-in groove is a rectangular groove structure, a plurality of the plug-in grooves are arranged, and the plug-in grooves are used to cooperate with a U-shaped tool to realize the rapid disassembly, assembly and replacement of the valve core.

[0008] As a further solution of the present invention: a connecting guide rod is fixedly provided on the top surface of the outer frame of the oil inlet buffer mesh plate, a connecting guide sleeve is installed on the outer side of the connecting guide rod, the upper end of the connecting guide sleeve is fixedly connected to the bottom surface of the connecting ring, a telescopic spring is provided on the outer side of the connecting guide sleeve and the connecting guide rod, the upper end of the telescopic spring is fixedly connected to the connecting ring, the lower end of the telescopic spring is fixedly connected to the outer frame of the oil inlet buffer mesh plate, and the middle part of the oil inlet buffer mesh plate is a mesh structure for buffering high-pressure oil.

[0009] As a further solution of the present invention: the oil inlet buffer mesh plate is a circular structure, and the connecting guide rods and the connecting guide sleeves are provided in multiple groups, which are evenly distributed in squares along the circumference on the oil inlet buffer mesh plate, and a limited support ring is provided on the outer side of the oil inlet buffer mesh plate to enhance the stability of the installation of the oil inlet buffer mesh plate.

[0010] As a further solution of the present invention: the diameter of the main pressure relief pipe of the two parallel pressure relief pipes is larger than the diameter of the energy release pipe, the pipeline flux diameter of the energy release pipe is 1 / 5-1 / 10 of the flux diameter of the main pressure relief pipe, the pipeline between the electromagnetic reversing device and the liquid pump is extended outwardly and a pressure gauge is installed, and an overflow valve is installed on the pipeline between the pressure relief pipeline and the main oil inlet joint of the electromagnetic reversing valve.

[0011] As a further solution of the present invention: an oil suction filter is arranged in the oil tank, the oil outlet end of the oil suction filter is connected to the liquid inlet end of the liquid suction pump, and a drain port is arranged on the side of the oil tank to facilitate the discharge of the oil in the oil tank.

[0012] As a further solution of the present invention: a matching installation groove is arranged on the bottom surface of the cylinder bottom, a limit platform matched with the matching installation groove is arranged on the outer side of the plug, a double sealing groove structure is arranged at the matching position of the cylinder bottom and the working cylinder, a piston is installed in the working cylinder, and a sealing ring is arranged between the piston and the working cylinder to ensure the matching sealing between the piston and the working cylinder.

[0013] As a further solution of the present invention: a limiting ring is arranged above the guide sleeve, a limiting nut is arranged above the limiting ring, and an upper pad is fixedly installed at the middle position of the piston.

[0014] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0015] The present invention connects an energy release pipe oil circuit with a smaller inner diameter in parallel to the pressure relief pipe arranged at the lower pipe joint at the bottom of the hinge beam, so as to realize slight adjustment of the oil pressure inside the cylinder diameter and perform dynamic energy release. The pressure relief oil circuit is used for pressure relief, and the dynamic energy release oil circuit is used for dynamic adjustment and control. The pipe flux diameter of the energy release pipe is 1 / 5-1 / 10 of the flux diameter of the main pressure relief pipe, so that the energy release of the cylinder has a good pressure regulating effect.

[0016] The liquid outlet ends of the side pipe joint and the lower pipe joint of the present invention are both installed with valve cores through threaded connection, and an oil through hole is arranged at the center of the valve core. The oil inlet amount is controlled by the valve core and the oil through hole. The valve core is provided with oil through holes of different sizes and specifications. The valve core with oil through holes of appropriate specifications is selected according to the assembly and use requirements. The valve core and the pipe joint are connected by fine-pitch threads. In order to ensure the sealing of the connection, a plurality of sealing grooves are arranged on the outer wall of the valve core, and a sealing ring 2 is installed in the sealing groove. A sealing outer cone surface is arranged on the outer side of the sealing ring 2, which can not only ensure the threaded connection, but also improve the sealing of the cooperation. At the same time, an oil inlet buffer mesh plate is arranged at the lower part of the pipe joint, which can effectively buffer the oil pressure, protect the pipe joint, and improve the service life of the pipe joint.

[0017] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 is a schematic diagram of the present invention; Figure 2 It is a partial enlarged view of point A of the present invention; Figure 3 It is a partial pipeline connection diagram of the present invention; Figure 4 It is a schematic diagram of the interior of the pipe joint of the present invention; Figure 5 It is a schematic diagram of the valve core of the present invention; Figure 6 It is a partial enlarged view of B of the present invention; Figure 7 A top view of the valve core of the present invention; Figure 8 It is the pressure regulation curve diagram of the present invention.

[0019] In the figure: 1. hinge beam; 2. working cylinder; 3. cylinder bottom; 4. piston; 5. sealing ring 1; 6. guide sleeve; 7. limiting ring; 8. limiting nut; 9. upper pad; 10. oil filling hole; 11. side pipe joint; 12. plug; 13. sealing connection seat; 14. lower pipe joint; 15. vent plug; 16. oil tank; 17. oil suction filter; 18. liquid pump; 19. pressure gauge; 20. solenoid reversing valve; 21. side oil supply pipe; 22. lower oil supply pipe; 23. cooler; 24. overflow valve; 25. return oil filter; 26. solenoid valve 1 ; 27. Electromagnetic overflow pressure reducing valve; 28. Solenoid valve 2; 29. ​​Energy release solenoid valve; 30. Pressure relay; 31. Limit table; 32. Matching installation groove; 33. Flow control core; 34. Filling hole; 35. Guide hole; 36. Guide cone hole; 37. Main pressure relief pipe; 38. Energy release pipe; 39. Valve core; 40. Sealing ring 2; 41. Oil hole; 42. Plug-in groove; 43. Oil inlet buffer mesh plate; 44. Limit support ring; 45. Sealing outer cone; 46. Connecting guide rod; 47. Connecting guide sleeve; 48. Telescopic spring; 49. Connecting ring.

[0020] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0022] like Figures 1 to 8As shown, a pressure relief device for pressure control of a six-sided top press comprises a hinge beam 1 and a hydraulic pipeline. The six-sided fixed press is assembled and combined by six hinge beams 1. Each hinge beam 1 is equipped with a hydraulic pipeline. The hydraulic pipeline includes an oil supply pipeline, a pressure relief pipeline and an energy release pipeline 38. A cylinder bottom 3 is installed at the bottom of the cylinder body of the hinge beam 1. A working cylinder 2 is arranged on the outside of the cylinder bottom 3. A guide sleeve 6 is arranged on the upper part of the working cylinder 2. An oil injection hole 10 is arranged on the outside of the guide sleeve 6. A side pipe is installed on the outside of the oil injection hole 10. The bottom hole of the hinge beam 1 is provided with a plug 12, the lower end of the plug 12 is provided with a sealing connection seat 13, a lower pipe joint 14 is provided on one side of the sealing connection seat 13, and a vent plug 15 is provided on the other side. The side pipe joint 11 is connected to one of the oil outlet interfaces of the electromagnetic reversing valve 20 through a side oil supply pipe 21, an oil inlet end of the electromagnetic reversing valve 20 is connected to the liquid pump 18 through a pipeline, and the lower pipe joint 14 is connected to the other oil outlet interface of the electromagnetic reversing valve 20 through a lower oil supply pipe 22. The lower oil supply pipe 22 is connected with a pressure relief pipeline, which includes two parallel pipelines, one of which is equipped with a solenoid valve 26, and the other is equipped with a solenoid valve 28 and a relief pressure reducing valve. At the same time, the pressure relief pipeline is connected with an energy release pipe 38 in parallel, and an energy release solenoid valve 29 is installed on the energy release pipe 38 of the energy release pipe 38. A pressure relay 30 is connected to the outside of the pressure relief pipeline. The liquid outlet ends of the pressure relief pipeline and the energy release pipe 38 are connected to the cooler 23, and the cooler 2 The side pipe joint 11 is connected to the return oil filter 25 through a pipeline, and the liquid outlet end of the return oil filter 25 extends into the oil tank 16. The upper end of the plug 12 is provided with a mounting hole, which is a stepped hole structure. A flow control core 33 is provided in the mounting hole, and a flow guide hole 35 is provided in the flow control core 33. A flow guide cone hole 36 is provided at the upper end of the flow guide hole 35. The side pipe joint 11 has the same structure as the lower pipe joint 14. A valve core 39 is provided at the upper position of the side pipe joint 11, and an oil inlet buffer mesh plate 43 is provided at the lower position.

[0023] Among them, the guide hole 35 is a tapered hole structure with a larger upper part and a smaller lower part. A filling hole 34 is arranged at the center position of the plug 12. The lower end diameter of the guide hole 35 is the same as the diameter of the filling hole 34. The upper end diameter of the guide hole 35 is the same as the lower end diameter of the guide cone hole 36. The taper of the guide cone hole 36 is greater than that of the guide hole 35, so as to ensure smooth filling and diversion.

[0024] The valve core 39 is connected to the main body of the side pipe joint 11 through a fine pitch thread. A plurality of sealing grooves are arranged on the thread outer diameter of the valve core 39. A sealing ring 40 is installed in the sealing groove. A sealing outer cone surface 45 is arranged on the outer side of the sealing ring 40. The sealing outer cone surface 45 has a structure that is larger at the top and smaller at the bottom, which will not affect the threaded connection and can enhance the sealing performance of the threaded connection.

[0025] An oil hole 41 is provided at the center of the valve core 39 , and a plug-in groove 42 is provided on the upper plane of the valve core 39 . The plug-in groove 42 is a rectangular groove structure, and there are multiple plug-in grooves 42 . The plug-in groove 42 is used to cooperate with a U-shaped tool to realize the rapid disassembly, assembly and replacement of the valve core 39 .

[0026] A connecting guide rod 46 is fixedly provided on the top surface of the outer frame of the oil inlet buffer mesh plate 43, and a connecting guide sleeve 47 is installed on the outer side of the connecting guide rod 46. The upper end of the connecting guide sleeve 47 is fixedly connected to the bottom surface of the connecting ring 49, and a telescopic spring 48 is provided on the outer side of the connecting guide sleeve 47 and the connecting guide rod 46. The upper end of the telescopic spring 48 is fixedly connected to the connecting ring 49, and the lower end of the telescopic spring 48 is fixedly connected to the outer frame of the oil inlet buffer mesh plate 43. The middle part of the oil inlet buffer mesh plate 43 is a mesh structure for buffering high-pressure oil.

[0027] The oil inlet buffer mesh plate 43 is a circular structure, and multiple groups of connecting guide rods 46 and connecting guide sleeves 47 are arranged, which are evenly distributed in squares along the circumference on the oil inlet buffer mesh plate 43. A limited support ring 44 is arranged on the outer side of the oil inlet buffer mesh plate 43 to enhance the stability of the installation of the oil inlet buffer mesh plate 43.

[0028] The diameter of the main pressure relief pipe 37 of the two parallel pressure relief pipes is larger than the diameter of the energy release pipe 38. The pipeline flux diameter of the energy release pipe 38 is 1 / 5-1 / 10 of the flux diameter of the main pressure relief pipe 37. The pipeline between the electromagnetic commutator and the liquid pump 18 extends outward and is equipped with a pressure gauge 19. The pipeline between the pressure relief pipeline and the main oil inlet joint of the electromagnetic reversing valve 20 is equipped with an overflow valve 24.

[0029] An oil suction filter 17 is arranged in the oil tank 16 , and the oil outlet end of the oil suction filter 17 is connected to the liquid inlet end of the liquid suction pump 18 . A liquid discharge port is arranged on the side of the oil tank 16 to facilitate the discharge of the oil in the oil tank 16 .

[0030] A matching installation groove 32 is provided on the bottom surface of the cylinder bottom 3, and a limit platform 31 matched with the matching installation groove 32 is provided on the outer side of the plug 12. A double sealing groove structure is provided at the matching position of the cylinder bottom 3 and the working cylinder 2. A piston 4 is installed in the working cylinder 2, and a sealing ring 5 is provided between the piston 4 and the working cylinder 2 to ensure the matching sealing between the piston 4 and the working cylinder 2.

[0031] A limiting ring 7 is arranged above the guide sleeve 6 , a limiting nut 8 is arranged above the limiting ring 7 , and an upper cushion block 9 is fixedly installed at the middle position of the piston 4 .

[0032] The working principle of the present invention is: when the six-sided top press is working normally, the combined assembly and pipeline connection are carried out, the oil intake and exhaust rate is determined according to the model, material and design pressure bearing capacity of the hinge beam 1, and the appropriate side pipe joint 11 and lower pipe joint 14 are selected according to the technical basic indicators, and the valve core 39 with the appropriate oil hole 41 specifications that is compatible with the pipe joint is selected, and the side pipe joint 11 and the lower pipe joint 14 are respectively sealed and connected with the corresponding pipelines in the oil circuit; During the oil supply process, the liquid pump 18 extracts the oil in the oil tank 16. During the extraction process, the oil is filtered by the oil suction filter 17 to prevent impurities in the oil from clogging the pipeline and affecting the working process of the top press. The oil is supplied to the side pipe joint 11 through the electromagnetic reversing valve 20 and the side oil supply pipe 21, and enters the knife oil filling hole 10. Under the action of oil pressure, the piston 4 moves relative to the cylinder body of the hinge beam 1; another passage of the electromagnetic reversing valve 20 is used to supply the oil extracted by the liquid pump 18 to the lower oil supply pipe 22. A one-way valve is installed on the lower oil supply pipe 22. The lower oil supply pipe 22 can only supply oil to the lower pipe joint 14 and cannot relieve pressure. A special pressure relief official road is provided. There are two pressure relief pipelines, one of which is equipped with a solenoid valve 26, and the other is equipped with a solenoid valve 28 and a solenoid overflow pressure reducing valve 27. The two pipelines are connected in parallel. The two pressure relief pipelines connected in parallel can effectively adjust the pressure relief state. The two pressure relief pipelines use a main pressure relief pipe 37. An energy release pipe 38 is arranged in parallel at the two pressure relief pipelines. An energy release solenoid valve 29 is installed on the energy release pipe 38. The diameter of the energy release pipe 38 is smaller than the diameter of the main pressure relief pipe 37. The flux diameter of the energy release pipe 38 is 1 / 5-1 / 10 of the flux diameter of the main pressure relief pipe 37, so that the oil cylinder energy release has a good pressure regulation effect. The pressure relief curve and the energy release curve are shown in the attached Figure 8 ; The oil passing through the pressure relief pipeline or the energy release pipe 38 is returned to the oil tank 16 for recycling after being processed in the cold zone of the cooler 23 and filtered by the return oil filter 25, ensuring that the oil is in a good recycling state; like Figure 1 and Figure 2 As shown, a plug 12 is arranged in the bottom hole of the hinge beam 1, and a filling hole 34 is arranged on the plug 12. The arrangement of the plug 12 enables the hinge beam 1 to have a good use effect. Plugs 12 of different specifications can be selected according to different requirements of oil filling, oil pressure control and processing. A flow control core 33 is installed on the upper part of the plug 12 through a threaded connection. A guide hole 35 is arranged on the flow control core 33. The guide hole 35 is a tapered hole structure with a large upper end and a small lower end. A guide tapered hole 36 is arranged outward from the upper end of the guide hole 35. The aperture of the lower end of the guide hole 35 is consistent with the aperture size of the filling hole 34, so as to perform filling and diversion transition. A limit platform 31 is arranged on the outer side of the upper part of the plug 12. The limit platform 31 and the matching installation groove 32 on the cylinder bottom 3 are installed and limited to ensure the installation stability of the plug 12. like Figure 4-Figure 7 As shown, a valve core 39 is installed at the upper position of the side pipe joint 11 and the lower pipe joint 14 through fine pitch threads. The matching position of the valve core 39 and the side pipe joint 11, that is, a sealing groove is processed on the external thread of the valve core 39, and a sealing ring 40 is installed in the sealing groove. A sealing outer cone 45 is arranged on the outer side of the sealing ring 40. It is installed by matching with the fine pitch thread. Because the pitch of the fine pitch thread is small and the thread lead angle is also small, this is conducive to the self-locking and relaxation of the thread, thereby preventing leakage. Due to its large number of teeth, continuous close contact can be ensured to prevent oil leakage. At the same time, multiple sealing rings 40 and the sealing outer cone 45 arranged on the outer side of the sealing ring 40 can further improve the stability and sealing of the valve core 39 installation; a plug-in groove 42 is arranged on the upper end surface of the valve core 39, and the plug-in groove 42 is a square groove structure. With the help of a U-shaped tool, the valve core 39 can be quickly disassembled and assembled, and the operation is simple. The side oil supply pipe 21 and the lower oil supply pipe 22 are both provided with an oil inlet buffer mesh plate 43. When the inlet oil pressure is relatively high, the hydraulic oil impacts the buffer mesh plate. The outer frame of the buffer mesh plate is equipped with a connecting guide rod 46, a connecting guide sleeve 47, a telescopic spring 48 and a connecting ring 49. Under the action of the impact force, the oil inlet buffer mesh plate 43 can effectively buffer and reduce the damage to the pipe joint caused by the high-pressure impact. A limited support ring 44 is provided on the outer side of the oil inlet buffer mesh plate 43 to facilitate the disassembly, assembly and replacement of the oil inlet buffer mesh plate 43. The present invention connects an energy release pipe 38 oil circuit with a smaller inner diameter in parallel to the pressure relief pipe arranged on the lower pipe joint 14 at the bottom of the hinge beam 1, so as to realize a slight adjustment of the oil pressure inside the cylinder diameter and perform dynamic energy release. The pressure relief oil circuit is used for pressure relief, and the dynamic energy release oil circuit is used for dynamic adjustment control. The pipeline flux diameter of the energy release pipe 38 is 1 / 5-1 / 10 of the flux diameter of the main pressure relief pipe 37, so that the oil cylinder energy release has a good pressure regulating effect. The liquid outlet ends of the side pipe joint 11 and the lower pipe joint 14 are both installed with a valve core 39 through a threaded connection. An oil through hole 41 is arranged at the center of the valve core 39, and the oil through hole 41 is controlled by the valve core 39 and the oil through hole 41. Oil inlet amount, the valve core 39 is provided with oil holes 41 of different sizes and specifications. The valve core 39 with oil holes 41 of appropriate specifications is selected according to the assembly and use requirements. The valve core 39 and the pipe joint are connected by fine-pitch threads. In order to ensure the sealing of the connection, a plurality of sealing grooves are provided on the outer wall of the valve core 39, and a sealing ring 2 40 is installed in the sealing groove. A sealing outer cone surface 45 is provided on the outer side of the sealing ring 2 40, which can not only ensure the threaded connection, but also improve the sealing of the fit. At the same time, an oil inlet buffer mesh plate 43 is provided at the lower part of the pipe joint, which can effectively buffer the oil pressure, protect the pipe joint, and increase the service life of the pipe joint.

[0033] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A pressure relief device for pressure control of a six-sided top press, comprising a hinge beam (1) and a hydraulic pipeline, characterized in that: The six-sided constant pressure machine is assembled and combined by six hinge beams (1), each of which is equipped with a hydraulic pipeline, which includes an oil supply pipeline, a pressure relief pipeline and an energy release pipeline (38). The bottom of the cylinder body of the hinge beam (1) is equipped with a cylinder bottom (3), the outer side of the cylinder bottom (3) is equipped with a working cylinder (2), the upper part of the working cylinder (2) is equipped with a guide sleeve (6), the outer side of the guide sleeve (6) is equipped with an oil injection hole (10), the outer side of the oil injection hole (10) is equipped with a side pipe joint (11), and the bottom hole of the hinge beam (1) is equipped with a plug. A sealing connection seat (13) is installed at the lower end of the plug (12); a lower pipe joint (14) is installed on one side of the sealing connection seat (13), and a vent plug (15) is installed on the other side; the side pipe joint (11) is connected to one of the oil outlet interfaces of the electromagnetic reversing valve (20) through a side oil supply pipe (21); an oil inlet end of the electromagnetic reversing valve (20) is connected to a liquid pump (18) through a pipeline; the lower pipe joint (14) is connected to the other oil outlet interface of the electromagnetic reversing valve (20) through a lower oil supply pipe (22); A pressure relief pipeline is connected to the pipe (22), and the pressure relief pipeline includes two parallel pipelines, one of which is equipped with a solenoid valve 1 (26), and the other is equipped with a solenoid valve 2 (28) and a relief pressure reducing valve. At the same time, an energy release pipe (38) is connected in parallel to the pressure relief pipeline, and an energy release solenoid valve (29) is installed on the energy release pipe (38) of the energy release pipe (38). A pressure relay (30) is connected to the outside of the pressure relief pipeline. The liquid outlet ends of the pressure relief pipeline and the energy release pipe (38) are connected to the cooler (23), and the cooler (23) is connected to the return oil filter (23) through a pipeline. 25), the liquid outlet end of the return oil filter (25) extends into the oil tank (16), the upper end of the plug (12) is provided with a mounting hole, the mounting hole is a stepped hole structure, a flow control core (33) is provided in the mounting hole, a flow guide hole (35) is provided in the flow control core (33), a flow guide cone hole (36) is provided at the upper end of the flow guide hole (35), the side pipe joint (11) has the same structure as the lower pipe joint (14), a valve core (39) is provided at the upper position of the side pipe joint (11), and an oil inlet buffer mesh plate (43) is provided at the lower position.

2. A pressure relief device for pressure control of a six-sided top press according to claim 1, characterized in that: The guide hole (35) is a tapered hole structure that is larger at the top and smaller at the bottom. A filling hole (34) is provided at the center of the plug (12). The diameter of the lower end of the guide hole (35) is the same as the diameter of the filling hole (34). The diameter of the upper end of the guide hole (35) is the same as the diameter of the lower end of the guide cone hole (36). The taper of the guide cone hole (36) is greater than the taper of the guide hole (35).

3. A pressure relief device for pressure control of a six-sided top press according to claim 2, characterized in that: The valve core (39) is connected to the main body of the side pipe joint (11) via a fine pitch thread. A plurality of sealing grooves are provided on the thread outer diameter of the valve core (39). A second sealing ring (40) is installed in the sealing groove. A sealing outer conical surface (45) is provided on the outer side of the second sealing ring (40). The sealing outer conical surface (45) is a structure with a larger upper portion and a smaller lower portion.

4. A pressure relief device for pressure control of a six-sided top press according to claim 3, characterized in that: An oil through hole (41) is provided at the center of the valve core (39), and a plug-in groove (42) is provided on the upper plane of the valve core (39). The plug-in groove (42) is a rectangular groove structure, and a plurality of the plug-in grooves (42) are provided.

5. A pressure relief device for pressure control of a six-sided top press according to claim 4, characterized in that: A connecting guide rod (46) is fixedly arranged on the top surface of the outer frame of the oil inlet buffer mesh plate (43); a connecting guide sleeve (47) is sleeved and installed on the outer side of the connecting guide rod (46); the upper end of the connecting guide sleeve (47) is fixedly connected to the bottom surface of a connecting ring (49); a telescopic spring (48) is arranged on the outer side of the connecting guide sleeve (47) and the connecting guide rod (46); the upper end of the telescopic spring (48) is fixedly connected to the connecting ring (49); the lower end of the telescopic spring (48) is fixedly connected to the outer frame of the oil inlet buffer mesh plate (43); and the middle part of the oil inlet buffer mesh plate (43) is a mesh plate structure.

6. A pressure relief device for pressure control of a six-sided top press according to claim 5, characterized in that: The oil inlet buffer mesh plate (43) is a circular structure, and a plurality of groups of the connecting guide rods (46) and the connecting guide sleeves (47) are arranged evenly distributed in a square shape along the circumference on the oil inlet buffer mesh plate (43). A limited support ring (44) is arranged on the outer side of the oil inlet buffer mesh plate (43).

7. A pressure relief device for pressure control of a six-sided top press according to claim 6, characterized in that: The diameter of the main pressure relief pipe (37) of the two parallel pressure relief pipes is larger than the diameter of the energy release pipe (38), and the pipe flux diameter of the energy release pipe (38) is 1 / 5-1 / 10 of the flux diameter of the main pressure relief pipe (37). A pressure gauge (19) is installed on the pipe extending outward between the electromagnetic commutator and the liquid pump (18), and an overflow valve (24) is installed on the pipe between the pressure relief pipe and the main oil inlet joint of the electromagnetic reversing valve (20).

8. A pressure relief device for pressure control of a six-sided top press according to claim 7, characterized in that: An oil suction filter (17) is arranged in the oil tank (16); an oil outlet end of the oil suction filter (17) is connected to a liquid inlet end of the liquid suction pump (18); and a liquid discharge port is arranged on a side of the oil tank (16).

9. A pressure relief device for pressure control of a six-sided top press according to claim 8, characterized in that: A matching installation groove (32) is provided on the bottom surface of the cylinder bottom (3), a limit platform (31) matched with the matching installation groove (32) is provided on the outer side of the plug (12), a double sealing groove structure is provided at the matching position between the cylinder bottom (3) and the working cylinder (2), a piston (4) is installed in the working cylinder (2), and a sealing ring (5) is provided between the piston (4) and the working cylinder (2).

10. A pressure relief device for pressure control of a six-sided top press according to claim 9, characterized in that: A limit ring (7) is arranged above the guide sleeve (6), a limit nut (8) is arranged above the limit ring (7), and an upper cushion block (9) is fixedly mounted at the middle position of the piston (4).

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