High-temperature and high-pressure sintering device for producing polycrystalline cubic boron nitride

Abstract

The invention provides a high-temperature and high-pressure sintering device for producing polycrystalline cubic boron nitride, relates to the field of cubic boron nitride production equipment, and aims to solve the problems that when a cubic press is used, the pressures of six hammers are inconsistent and the like. Comprising a cubic press main body, the cubic press main body comprises six groups of hinge beams which are distributed up, down, front, back, left and right, oil cylinder parts are coaxially fixed on the inner sides of the hinge beams, a nail hammer part is coaxially fixed on a piston rod of each oil cylinder part through a heat insulation seat, the oil cylinder parts are externally connected with a hydraulic unit, and the cubic press further comprises a compensation mechanism and a pressurization sealing mechanism; through the arrangement of a compensation plate, an annular compensation groove, an annular groove, an oil storage cylinder and the like, six compensation mechanisms which are communicated with one another are arranged in six oil cylinder pieces according to the communicating vessel principle, the cylinder body pressure of the six nail hammers is compensated in real time, the pressure consistency of the six nail hammers is achieved, and meanwhile accumulative errors can be avoided through the mode.

Description

Technical Field

[0001] The invention relates to the technical field of cubic boron nitride production equipment, in particular to a high-temperature and high-pressure sintering device for producing polycrystalline cubic boron nitride. Background Art

[0002] In my country, a widely used device for sintering cubic boron nitride is the six-sided top press, which is a special high-pressure device mainly used to simulate the high temperature and high pressure environment deep in the earth to study the physical and chemical properties of minerals, rocks and other materials under extreme conditions. It can apply pressure evenly in six directions, thereby more accurately simulating the high-pressure environment in nature.

[0003] During the sintering process of cubic boron nitride, the sample is placed in a pressure chamber and the pressure chamber is placed on the working platform of a six-sided top press. The hydraulic system is started, and six hammers act on the six sides of the pressure chamber respectively, with equal pressure from each hammer. However, in actual operation, there are often many reasons that lead to inconsistent pressures of the six hammers. The main reasons are: mechanical asymmetry, improper installation or poor quality of the pressure transmission medium, hydraulic system failure, and control system errors. The failure of the hydraulic system is mainly due to problems with the pump, valve, or pipeline. Once the pressures of the six hammers are inconsistent, the sample will produce problems such as non-uniform deformation, cracks or fractures, physical property measurement deviations, and uneven chemical reactions.

[0004] A Chinese patent with application number CN201911211853.9 discloses a synchronous control system for the hydraulic cylinders of a six-sided top press, including a single-cylinder oil supply pipeline and a reciprocating supercharger corresponding one-to-one to the working cylinders, an ultra-high-pressure hydraulically controlled one-way valve is provided on the single-cylinder oil supply pipeline, and a single-cylinder one-way valve is provided on the oil inlet of the single-cylinder oil supply pipeline. The high-pressure plunger oil discharge ports of the six reciprocating superchargers are connected in parallel to the outlet of the ultra-high-pressure one-way valve, and the T ports of the six reciprocating supercharger solenoid valves are connected in parallel to the inlet of the ultra-high-pressure hydraulically controlled one-way valve. The low-pressure piston oil discharge of the reciprocating supercharger flows out through the T port of the reciprocating supercharger solenoid valve and is pressed into the inlet of the ultra-high-pressure hydraulically controlled one-way valve after being connected in parallel; the synchronous control system ensures the control accuracy of the synchronous displacement of the six cylinders with equal volume oil supply by arranging a reciprocating supercharger on the oil supply pipeline of each working cylinder, so that it can also accurately control the synchronous displacement of the six cylinders during the filling and overpressure processes. However, relying solely on a reciprocating supercharger to control the hydraulic system has significant limitations. In particular, the internal components of the reciprocating supercharger will cause cumulative errors due to wear, insufficient lubrication, temperature changes, and fluid contamination. When the cumulative error reaches a certain value, it will inevitably cause inconsistent pressures among the six hammers.

[0005] A Chinese patent with application number CN202410649558.6 discloses an absolute displacement measurement system for a six-sided top press, comprising a six-sided top press body, the six-sided top press comprising six groups of hinged beams, an oil cylinder being embedded and fixed on the inner side of the hinged beams; a piston rod of the oil cylinder being fixed with a top hammer through a top hammer seat; the oil cylinder being connected to a hydraulic system; and further comprising a calibration block, a displacement measurement unit, an oil pressure transmitter and a displacement measurement unit, the calibration block being arranged on the outer edge of the top hammer seat, the displacement measurement unit comprising a ring plate, an outer cylinder seat being fixed on the ring plate, a laser displacement sensor being fixed on the inner side of the outer cylinder seat; the laser displacement sensor being installed facing the calibration block; the absolute displacement measurement system for the six-sided top press accurately measures the absolute displacement of the top hammer, can accurately measure and control the displacement distance of the top hammer and the stop hammer distance, and ensure that the six-sided top press accurately centers and presses the generating block. However, the control system mainly monitors and compensates the displacement of the six hammers in real time through various sensors and control elements, and is highly dependent on sensors and controllers. Once a sensor fails, precise control of the six hammers will also be lost. Summary of the invention

[0006] In view of the above problems, the present invention provides a high-temperature and high-pressure sintering device for the production of polycrystalline cubic boron nitride, which has the advantages that the pressure of six hammers always remains consistent and no cumulative error occurs.

[0007] The technical solution is that the present invention includes a six-sided top press main body, the six-sided top press main body includes six groups of hinge beams distributed in the upper, lower, front, rear, left and right directions, a cylinder part is coaxially fixed inside the hinge beam, a piston rod of the cylinder part is coaxially fixed with a nail hammer part through a heat insulation seat, the cylinder part is externally connected to a hydraulic unit, and further includes:

[0008] Compensation mechanisms, the number of which is six and which are respectively located in corresponding cylinder members, and each compensation mechanism is in a connected state. When the piston rods in the six cylinder members move synchronously, the compensation mechanism can perform a compensation action according to the different pressures in the cylinder members;

[0009] The pressurized sealing mechanism is located in the compensating mechanism. The greater the pressure on the compensating mechanism, the stronger the sealing performance of the pressurized sealing mechanism on the compensating mechanism.

[0010] Preferably, the cylinder component also includes a cylinder assembly, which includes a cylinder sleeve coaxially arranged with the hinge beam, the end of the cylinder sleeve close to the hinge beam is threadedly connected to a base, an oil hole is penetrated through the axis of the base, the piston rod slides coaxially with the cylinder sleeve, and an end cover matching the piston rod is coaxially fixed to the end of the cylinder sleeve away from the base.

[0011] Preferably, a mounting hole is provided through the axis of the hinge beam, a mounting block matching the mounting hole is fixedly connected to the axis of the end of the base away from the cylinder sleeve, a mounting plate is coaxially fixed in the mounting hole, the mounting plate and the mounting block are connected by bolts, an oil nozzle is coaxially fixed on the mounting plate, and the oil nozzle is connected to the hydraulic unit by a pipeline.

[0012] Preferably, the compensation mechanism includes an annular compensation groove coaxially opened on the base, the annular compensation groove is located on the side of the base close to the piston rod, a compensation plate is coaxially slid in the annular compensation groove, the compensation plate and the annular compensation groove cooperate to form a pressure chamber, the compensation plate is an annular structure and seals are provided on both the inner and outer rings, a plurality of circumferentially evenly distributed liquid holes are penetrated through the side of the annular compensation groove close to the hinge beam, an annular groove matching the liquid holes is coaxially opened on the inner side of the hinge beam, a flow channel is penetrated through the end of the annular groove away from the base, a connecting nozzle matching the flow channel is fixedly connected to one end of the hinge beam, and the six connecting nozzles are connected to the same oil storage cylinder through hoses.

[0013] Preferably, a positioning rod penetrating the movable groove is fixedly connected to one side of the compensation plate close to the pressure chamber, one end of the positioning rod penetrating the movable groove is located in the annular groove, and the positioning rod is sealingly and slidably connected to the base.

[0014] Preferably, the boost sealing mechanism includes a plurality of liquid inlet grooves opened inside the compensation plate, and the plurality of liquid inlet grooves are evenly distributed in a circle with the oil hole as the center, a plurality of liquid inlet holes connected to the liquid inlet grooves are opened on one side of the compensation plate, and the inner ring and the outer ring of the compensation plate are both provided with through grooves connected to the liquid inlet grooves, and the sealing member is made of elastic material and is fixed in the through groove.

[0015] Preferably, it also includes a grading mechanism, which is located in the base and the compensation mechanism. The cylinder member is divided into a pressurization stage, a pressure maintaining stage and a pressure reduction stage. In the pressurization stage of the cylinder member, the grading mechanism restricts the compensation mechanism so that it does not perform the compensation action. When the cylinder member enters the pressure maintaining stage, the grading mechanism releases the restriction on the compensation mechanism so that it performs the compensation action.

[0016] Preferably, the grading mechanism includes connecting parts located at the inner ring and the outer ring of the compensation plate, the connecting parts are provided with a plurality of circumferentially evenly distributed sockets, the insertion ends of the sockets are rounded, and the grading mechanism also includes two groups of limit units coaxially arranged with the base, and the two groups of limit units are matched with the connecting parts of the inner ring and the outer ring respectively.

[0017] Preferably, the limiting unit includes a movable groove coaxially opened on the base with the annular compensation groove, an annular pressure plate is slidably connected in the movable groove, the annular pressure plate and the movable groove are connected by an elastic member, a plurality of connecting grooves matching the sockets are opened on the inner side of the annular pressure plate, a plurality of plugs matching the sockets are slidably connected in the movable groove, the plugs are located in the connecting groove, positioning columns are fixedly connected on both sides of the plug, arc plates matching the positioning columns are respectively fixedly connected on both sides of the connecting groove, the positioning columns are in contact with the upper surface of the arc plate, one end of the plug is connected to the movable groove by a spring, and the other end of the plug and the side away from the annular pressure plate are set with an arc surface.

[0018] Preferably, the end of the oil hole close to the piston rod is rounded, and a buffer groove is provided at the axis of the end of the piston rod close to the oil hole.

[0019] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0020] 1. Through the arrangement of compensation plates, annular compensation grooves, annular grooves and oil storage cylinders, six interconnected compensation mechanisms are arranged in six oil cylinder parts according to the principle of communicating vessels, so as to compensate the cylinder pressures of the six hammers in real time and achieve pressure consistency of the six hammers. At the same time, this method can also avoid cumulative errors.

[0021] 2. Through the arrangement of the liquid inlet groove, liquid inlet hole, through groove and seal, the sealing performance between the compensation plate and the annular compensation groove is enhanced as the pressure increases, thereby preventing the two hydraulic systems from penetrating each other and affecting the piston rod, thereby improving the reliability of the compensation mechanism.

[0022] 3. Through the settings of connectors, jacks and limit units, the compensation mechanism can compensate the cylinder parts after entering the pressurization stage, avoiding the problem of inaccurate movement of the piston rod due to misdetection of the sensor of the hydraulic pipeline when compensating in the pressurization stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0024] Figure 2 It is a plan view of the present invention.

[0025] Figure 3 It is a schematic diagram of the coordination of the hinge beam and the connecting member in the present invention.

[0026] Figure 4 It is a three-dimensional cross-sectional view of the oil cylinder component and the connecting component in the present invention.

[0027] Figure 5 It is a disassembly schematic diagram of the hinge beam and the connecting parts in the present invention.

[0028] Figure 6 It is a half-section view of the compensation mechanism in the present invention.

[0029] Figure 7 The present invention Figure 6 A schematic diagram of the enlarged structure at point A in the middle.

[0030] Figure 8 It is a half-section view of the pressurized sealing mechanism in the present invention.

[0031] Fig. 9 It is a half-section diagram of the grading mechanism in the present invention.

[0032] Fig.10 The present invention Fig. 9 A magnified schematic diagram of the structure at point B in the middle.

[0033] Fig.11 It is a schematic diagram of the coordination of the positioning column and the arc plate in the present invention.

[0034] Explanation of the symbols in the schematic diagram:

[0035] 1. Six-sided top press machine body; 11. Hinge beam; 12. Cylinder parts; 121. Piston rod; 1211. Buffer groove; 122. Cylinder assembly; 1221. Cylinder sleeve; 1222. Base; 1223. Mounting block; 123. Oil hole; 13. Heat insulation seat; 14. Nail hammer parts; 15. End cover; 16. Mounting plate; 17. Oil nozzle;

[0036] 2. Compensation mechanism; 21. Annular compensation groove; 22. Compensation plate; 23. Sealing element; 24. Liquid hole; 25. Annular groove; 26. Flow channel; 27. Connection nozzle;

[0037] 3. Pressurized sealing mechanism; 31. Liquid inlet groove; 32. Liquid inlet hole; 33. Through groove;

[0038] 4. Grading mechanism; 41. Connecting piece; 42. Socket; 43. Limiting unit; 431. Movable groove; 432. Annular pressure plate; 433. Connecting groove; 434. Latch; 435. Positioning column; 436. Arc plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] Example 1

[0041] In the use of the six-sided top press, there are often many reasons that lead to inconsistent pressures of the six hammers, such as hydraulic system failures caused by problems with pumps, valves or pipelines. There are great limitations in achieving precise control of the six hammers by setting a reciprocating supercharger or various sensors and controllers. For example, the cumulative error generated by the reciprocating supercharger and the measurement error generated by various sensors will cause the loss of precise control of the hammers. In order to solve the above problems, this embodiment proposes a high-temperature and high-pressure sintering device for the production of polycrystalline cubic boron nitride.

[0042] Depend on Figures 1 to 5 It is given, including a six-sided top press body 1, which includes six groups of hinge beams 11 distributed in the upper, lower, front, rear, left and right directions. A cylinder member 12 is coaxially fixed on the inner side of the hinge beam 11, and a piston rod 121 of the cylinder member 12 is coaxially fixed with a hammer member 14 through a heat insulation seat 13. The hammer member 14 includes a mounting head coaxially fixed with the heat insulation seat 13, and a hammer is coaxially fixed inside the mounting head. The sides of the hammer and the mounting head are both inclined arc surfaces. The cylinder member 12 is externally connected to a hydraulic unit, and the hydraulic unit includes but is not limited to a hydraulic pump, a motor, a fuel tank, a control valve, a high-pressure hose or a hard pipe, a filter and a cooling device, and also includes a compensation mechanism 2.

[0043] refer to Figure 4 As shown, there are six compensation mechanisms 2 which are respectively located in corresponding cylinder components 12 . Each compensation mechanism 2 is in a connected state. When the piston rods 121 in the six cylinder components 12 move synchronously, the compensation mechanism 2 can perform compensation actions according to the different pressures in the cylinder components 12 .

[0044] refer to Figure 3 and Figure 5 As shown, the cylinder member 12 also includes a cylinder assembly 122, which includes a cylinder sleeve 1221 coaxially arranged with the hinge beam 11, and a base 1222 is threadedly connected to one end of the cylinder sleeve 1221 close to the hinge beam 11, and an oil hole 123 is penetrated through the axis of the base 1222, and the hydraulic oil enters the cylinder assembly 122 through the oil hole 123, and the piston rod 121 slides coaxially with the cylinder sleeve 1221, and an end cover 15 matching the piston rod 121 is coaxially fixed to one end of the cylinder sleeve 1221 away from the base 1222.

[0045] refer to Figure 4 As shown, during the pressurization stage of the six-sided press, in order to make the hydraulic oil enter the cylinder assembly 122 from the oil hole 123 more smoothly, the oil hole 123 is rounded at one end close to the piston rod 121, and a buffer groove 1211 is opened at the axis of the end of the piston rod 121 close to the oil hole 123. The buffer groove 1211 can play a certain guiding role for the hydraulic oil and help the fluid to be better distributed on the surface of the piston rod 121.

[0046] refer to Figure 4 As shown, to supplement the matching mode of the hinge beam 11 and the cylinder assembly 122, a mounting hole is opened through the axis of the hinge beam 11, and a mounting block 1223 matching the mounting hole is fixedly connected to the axis of the end of the base 1222 away from the cylinder sleeve 1221, and a mounting plate 16 is coaxially fixed in the mounting hole, and the mounting plate 16 is connected to the mounting block 1223 by bolts. An oil nozzle 17 is coaxially fixed on the mounting plate 16, and the oil nozzle 17 is connected to the hydraulic unit through a pipeline.

[0047] refer to Figure 4 and Figure 6 As shown, the compensation mechanism 2 is supplemented by the fact that the compensation mechanism 2 includes an annular compensation groove 21 coaxially opened on the base 1222, the annular compensation groove 21 is located on the side of the base 1222 close to the piston rod 121, a compensation plate 22 is coaxially slid in the annular compensation groove 21, the compensation plate 22 and the annular compensation groove 21 cooperate to form a pressure chamber, the pressure chamber is filled with hydraulic oil, the initial position of the compensation plate 22 is the middle of the annular compensation groove 21, the compensation plate 22 is an annular structure and a seal 23 is arranged on both the inner and outer rings, the seal 23 is an annular sealing ring, a plurality of circumferentially uniformly distributed liquid holes 24 are penetrated on the side of the annular compensation groove 21 close to the hinge beam 11, an annular groove 25 matching the liquid hole 24 is coaxially opened on the inner side of the hinge beam 11, a flow channel 26 is penetrated on the end of the annular groove 25 away from the base 1222, a connecting nozzle 27 matching the flow channel 26 is fixedly connected to one end of the hinge beam 11, and the six connecting nozzles 27 are connected to the same oil storage cylinder through a hose.

[0048] Furthermore, in order to prevent the compensation plate 22 from rotationally deviating when moving in the annular compensation groove 21, a positioning rod passing through the movable groove 431 is fixedly connected to the side of the compensation plate 22 close to the pressure chamber, and one end of the positioning rod passing through the movable groove 431 is located in the annular groove 25, and the positioning rod is sealed and slidably connected to the base 1222.

[0049] During use, the cubic boron nitride sample is placed in the pressure chamber and the pressure chamber is placed on the working platform of the six-sided press, the hydraulic unit is started, the six cylinder parts 12 enter the pressurization stage at the same time, and the six piston rods 121 move toward the pressure chamber at the same time. At this time, each compensation mechanism 2 is in a connected state. When the pressure in one of the cylinder assemblies 122 is inconsistent with the pressure in other cylinder assemblies 122, the six compensation plates 22 will move in the corresponding annular compensation grooves 21. According to the principle of communicating vessels, the compensation plate 22 with a larger degree of pressure will move and compensate the compensation plate 22 with a smaller degree of pressure, so that the pressure in each cylinder assembly 122 remains consistent.

[0050] By setting up the compensation plate 22, the annular compensation groove 21, the annular groove 25 and the oil storage cylinder, six mutually connected compensation mechanisms 2 are set in the six cylinder parts 12 according to the principle of communicating vessels, so as to perform real-time compensation for the cylinder pressures of the six hammers and achieve pressure consistency of the six hammers. At the same time, this method can also avoid cumulative errors.

[0051] Example 2

[0052] Considering that when the six-sided press is in the pressurization and pressure-maintaining stages, the pressure inside the cylinder and the compensation mechanism 2 is relatively high, if the two hydraulic systems leak and penetrate each other, it is easy to cause the piston rod 121 to move excessively or move insufficiently. In view of the above problems, further improvements are made on the basis of the above embodiments.

[0053] refer to Figure 6 and Figure 7 As shown, it also includes a pressurization sealing mechanism 3, which is located in the compensation mechanism 2. The greater the pressure on the compensation mechanism 2, the stronger the sealing performance of the pressurization sealing mechanism 3 on the compensation mechanism 2.

[0054] refer to Figure 7 As shown, the boost sealing mechanism 3 includes a plurality of liquid inlet grooves 31 opened inside the compensation plate 22, and the plurality of liquid inlet grooves 31 are evenly distributed in a circle with the oil hole 123 as the center, and a plurality of liquid inlet holes 32 connected to the liquid inlet grooves 31 are opened on one side of the compensation plate 22. In the present embodiment, the liquid inlet holes 32 are opened on one side of the pressure chamber, and the inner ring and the outer ring of the compensation plate 22 are both provided with through grooves 33 connected to the liquid inlet grooves 31, and the sealing member 23 is made of elastic material and is fixed in the through grooves 33.

[0055] During use, the liquid inlet hole 32 is connected to the pressure chamber, and the hydraulic oil inside the pressure chamber enters the liquid inlet groove 31 and the through groove 33 from the liquid inlet hole 32. As the pressure inside the pressure chamber increases, the greater the pressure on the seal 23, the greater the contact force between the seal 23 and the annular compensation groove 21.

[0056] By configuring the liquid inlet groove 31, the liquid inlet hole 32, the through groove 33 and the seal 23, the sealing performance between the compensation plate 22 and the annular compensation groove 21 is enhanced as the pressure increases, thereby preventing the two hydraulic systems from penetrating each other and affecting the piston rod 121, thereby improving the reliability of the compensation mechanism 2.

[0057] Example 3

[0058] In actual use, it is found that since the piston movement mainly includes the pressurization stage, the pressure maintenance stage and the pressure reduction stage, if the piston is compensated in the pressurization stage, it may cause the piston movement to be inaccurate, causing the sensor of the hydraulic pipeline to produce misdetection. In view of the above problems, further improvements are made on the basis of the above embodiments.

[0059] refer to Figure 8 As shown, it also includes a grading mechanism 4, which is located in the base 1222 and the compensation mechanism 2. The cylinder part 12 is divided into a pressurization stage, a pressure maintaining stage and a pressure reduction stage. In the pressurization stage of the cylinder part 12, the grading mechanism 4 restricts the compensation mechanism 2 so that it does not perform the compensation action. When the cylinder part 12 enters the pressure maintaining stage, the grading mechanism 4 releases the restriction on the compensation mechanism 2 so that it performs the compensation action.

[0060] refer to Figure 8 As shown, the grading mechanism 4 includes a connector 41 located at the inner ring and the outer ring of the compensation plate 22, the connector 41 is an annular connecting plate, and a plurality of circumferentially evenly distributed sockets 42 are opened through the connector 41. In order for the subsequent sockets 42 to better cooperate with the pins 434, the insertion ends of the sockets 42 are rounded. The grading mechanism 4 also includes two groups of limit units 43 coaxially arranged with the base 1222, and the two groups of limit units 43 are matched with the connectors 41 of the inner ring and the outer ring respectively.

[0061] refer to Figure 8 and Fig. 9 As shown, further supplementing the limiting unit 43 is that the limiting unit 43 includes a movable groove 431 coaxially opened on the base 1222 and the annular compensation groove 21, and an annular pressure plate 432 is slidably connected in the movable groove 431, and the annular pressure plate 432 is connected to the movable groove 431 through an elastic member. In the present embodiment, the elastic member is a strong spring. Only when the pressure on the annular pressure plate 432 exceeds the threshold value, the strong spring will be compressed. A plurality of connecting grooves 433 matching the socket 42 are opened on the inner side of the annular pressure plate 432, and the number and opening positions of the connecting grooves 433 match the socket 42. A plurality of plugs 434 matching the socket 42 are slidably connected in the movable groove 431, and a connecting hole matching the socket 42 is opened in the movable groove 431, and the plugs 434 are inserted into the connecting holes. The diameter and position of the latch 434 match the socket 42, a sealing ring is provided on the circumferential side of the latch 434 to prevent hydraulic oil from entering the movable groove 431, the latch 434 is located in the connecting groove 433, and positioning columns 435 are fixedly connected on both sides of the latch 434, and arc plates 436 matching the positioning columns 435 are fixedly connected on both sides of the connecting groove 433, and the positioning columns 435 are in contact with the upper surface of the arc plate 436. When the annular pressure plate 432 drives the arc plate 436 to move inward, the latch 434 moves into the movable groove 431 under the action of the positioning columns 435 and the arc plate 436. One end of the latch 434 is connected to the movable groove 431 by a spring, and the latch 434 is reset by the spring. The other end of the latch 434 and the side away from the annular pressure plate 432 are set as an arc surface.

[0062] In use, when the oil cylinder 12 is in the early and middle stages of the pressurization stage, the pressure on the annular pressure plate 432 is not enough to compress the strong spring. When the pressure in the pressure-maintaining stage is slowly reached, the annular pressure plate 432 gradually moves into the movable groove 431. At this time, the latch 434 moves toward the direction close to the connecting groove 433 under the action of the positioning column 435 and the arc plate 436. When the oil cylinder 12 completely enters the pressure-maintaining stage, the latch 434 is disengaged from the socket 42, and the compensation plate 22 is in a free state. At this time, the compensation mechanism 2 can be adjusted according to the pressure of each oil cylinder 12. 2 performs compensation action. When the cylinder member 12 enters the pressure reduction stage, the annular pressure plate 432 is gradually reset to the initial state, and the latch 434 is in an elastic active state. When the hydraulic oil in the cylinder member 12 is completely extracted, the compensation plate 22 is re-located in the middle of the annular compensation groove 21. At this time, the latch 434 is matched with the socket 42 again, and the arc side of the latch 434 can better match with the connector 41. When the side of the connector 41 contacts the arc side of the latch 434, the latch 434 slides upward until the socket 42 is re-inserted into the socket 42.

[0063] By configuring the connector 41, the socket 42 and the limit unit 43, the compensation mechanism 2 can compensate the cylinder 12 after entering the pressurization stage, thereby avoiding the problem of misdetection of the sensor of the hydraulic pipeline when compensating in the pressurization stage, thereby causing the piston rod 121 to move inaccurately.

[0064] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A high-temperature and high-pressure sintering device for producing polycrystalline cubic boron nitride, comprising a six-sided top press body (1), the six-sided top press body (1) comprising six groups of hinge beams (11) distributed in the upper, lower, front, rear, left and right directions, a cylinder member (12) being coaxially fixed inside the hinge beam (11), a piston rod (121) of the cylinder member (12) being coaxially fixed with a nail hammer member (14) through a heat insulation seat (13), the cylinder member (12) being externally connected to a hydraulic unit, characterized in that: Also includes: Compensation mechanisms (2), the number of the compensation mechanisms (2) being six and being respectively located in corresponding oil cylinder members (12), the compensation mechanisms (2) being in a connected state, and when the piston rods (121) in the six oil cylinder members (12) move synchronously, the compensation mechanisms (2) can perform compensation actions according to the different pressures in the oil cylinder members (12); A pressurized sealing mechanism (3), wherein the pressurized sealing mechanism (3) is located in the compensation mechanism (2), and the greater the pressure on the compensation mechanism (2), the stronger the sealing performance of the pressurized sealing mechanism (3) on the compensation mechanism (2).

2. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 1, characterized in that: The oil cylinder component (12) further comprises an oil cylinder assembly (122), wherein the oil cylinder assembly (122) comprises a cylinder sleeve (1221) coaxially arranged with the hinge beam (11), wherein one end of the cylinder sleeve (1221) close to the hinge beam (11) is threadedly connected to a base (1222), an oil hole (123) is provided through the axis of the base (1222), the piston rod (121) slides coaxially with the cylinder sleeve (1221), and an end cover (15) matching the piston rod (121) is coaxially fixed to one end of the cylinder sleeve (1221) away from the base (1222).

3. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 2, characterized in that: A mounting hole is provided through the axis of the hinge beam (11); a mounting block (1223) matching the mounting hole is fixedly connected to the axis of one end of the base (1222) away from the cylinder sleeve (1221); a mounting plate (16) is coaxially fixed in the mounting hole; the mounting plate (16) is connected to the mounting block (1223) by bolts; an oil nozzle (17) is coaxially fixed on the mounting plate (16); and the oil nozzle (17) is connected to the hydraulic unit by a pipeline.

4. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 3, characterized in that: The compensation mechanism (2) comprises an annular compensation groove (21) coaxially provided on the base (1222), the annular compensation groove (21) being located on a side of the base (1222) close to the piston rod (121), a compensation plate (22) coaxially sliding in the annular compensation groove (21), the compensation plate (22) and the annular compensation groove (21) cooperating to form a pressure chamber, the compensation plate (22) being annular in structure and having sealing members (23) provided on both the inner and outer rings, the annular compensation groove (2 1) A plurality of circumferentially evenly distributed liquid holes (24) are formed through one side close to the hinge beam (11); an annular groove (25) matching the liquid hole (24) is formed coaxially on the inner side of the hinge beam (11); a flow channel (26) is formed through one end of the annular groove (25) away from the base (1222); a connection nozzle (27) matching the flow channel (26) is fixedly connected to one end of the hinge beam (11); and six connection nozzles (27) are connected to the same oil storage cylinder via hoses.

5. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 4, characterized in that: A positioning rod penetrating the movable groove (431) is fixedly connected to one side of the compensation plate (22) close to the pressure chamber. One end of the positioning rod penetrating the movable groove (431) is located in the annular groove (25). The positioning rod is sealingly and slidably connected to the base (1222).

6. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 5, characterized in that: The pressurized sealing mechanism (3) comprises a plurality of liquid inlet grooves (31) provided inside the compensation plate (22), the plurality of liquid inlet grooves (31) being evenly distributed in a circle with the oil hole (123) as the center, a plurality of liquid inlet holes (32) connected to the liquid inlet grooves (31) being provided on one side of the compensation plate (22), a through groove (33) connected to the liquid inlet groove (31) being provided on both the inner ring and the outer ring of the compensation plate (22), and the sealing member (23) being made of elastic material and fixed in the through groove (33).

7. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 6, characterized in that: The invention also comprises a grading mechanism (4), wherein the grading mechanism (4) is located in the base (1222) and the compensation mechanism (2), and the oil cylinder (12) is divided into a pressurization stage, a pressure holding stage and a pressure reduction stage. In the pressurization stage of the oil cylinder (12), the grading mechanism (4) restricts the compensation mechanism (2) so that it does not perform the compensation action. When the oil cylinder (12) enters the pressure holding stage, the grading mechanism (4) releases the restriction on the compensation mechanism (2) so that it performs the compensation action.

8. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 7, characterized in that: The grading mechanism (4) comprises a connecting piece (41) located at the inner ring and the outer ring of the compensation plate (22), the connecting piece (41) is provided with a plurality of circumferentially evenly distributed plug holes (42), the insertion ends of the plug holes (42) are rounded, and the grading mechanism (4) further comprises two groups of limit units (43) coaxially arranged with the base (1222), and the two groups of limit units (43) are matched with the connecting piece (41) of the inner ring and the outer ring respectively.

9. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 8, characterized in that: The limiting unit (43) comprises a movable groove (431) coaxially arranged with the annular compensation groove (21) on the base (1222); an annular pressure-bearing plate (432) is slidably connected in the movable groove (431); the annular pressure-bearing plate (432) and the movable groove (431) are connected via an elastic member; a plurality of connection grooves (433) matching the plug hole (42) are arranged on the inner side of the annular pressure-bearing plate (432); a plurality of latches (434) matching the plug hole (42) are slidably connected in the movable groove (431); The latch (434) is located in the connecting groove (433), and positioning columns (435) are fixedly connected to both sides of the latch (434). Arc plates (436) matching the positioning columns (435) are fixedly connected to both sides of the connecting groove (433), and the positioning columns (435) are in contact with the upper surface of the arc plate (436). One end of the latch (434) is connected to the movable groove (431) through a spring, and the other end of the latch (434) and the side away from the annular pressure plate (432) are arranged as an arc surface.

10. A high temperature and high pressure sintering device for producing polycrystalline cubic boron nitride according to claim 9, characterized in that: The end of the oil hole (123) close to the piston rod (121) is rounded, and a buffer groove (1211) is provided at the axis of the end of the piston rod (121) close to the oil hole (123).

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