Full-automatic hot pressing device for boron nitride ceramic parts

Abstract

The invention relates to the technical field of press machines, in particular to a full-automatic hot pressing device for boron nitride ceramic parts. Comprising a press; the feeding device is arranged on a fixed seat of the press machine; the movable die holder is arranged on a sliding seat of the press machine; the fixed die holder is arranged on a fixed seat of the press machine, and graphite paper is arranged on the inner side of the fixed die holder; the power mechanism is arranged on the press machine, and the power mechanism is provided with a feeding pipe; the discharging frame is fixedly connected and communicated with the lower end of the feeding pipe, and an electric push rod is fixedly connected to the feeding pipe; the multiple sliding rods are connected into the discharging frame in a sliding mode, and electric rotating shafts are arranged on the sliding rods; and the rotating sleeve is arranged on the electric rotating shaft. The electric rotating shaft drives the rotating sleeve to rotate, the rotating sleeve upwards extrudes redundant graphite paper, so that the graphite paper is attached to the inner side of the fixed die holder again, and the probability that the graphite paper is scratched by the movable die holder is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of presses, in particular to a fully automatic hot pressing device for boron nitride ceramic parts. Background Art

[0002] Most of the existing boron nitride ceramic parts (hereinafter referred to as ceramic parts) are produced by hot pressing devices. The hot pressing device promotes the densification of boron nitride powder by applying high temperature and high pressure during production, thereby increasing the sintering density of boron nitride powder, thereby improving the success rate of sintering ceramic parts. Due to the high melting point of boron nitride, metal materials cannot withstand the temperature during the sintering of boron nitride. Most of the existing hot pressing devices use graphite as the mold material (hereinafter referred to as the mold). However, due to the presence of boron oxide in the boron nitride powder raw material, boron oxide will volatilize at high temperature and react with graphite, resulting in pits on the mold surface after a period of use, affecting the surface quality of the boron nitride ceramic parts. Therefore, the existing hot pressing device When the device is in use, graphite paper will be added to the inside of the mold to make boron oxide react with the graphite paper to avoid damage to the mold. However, when fixing the graphite paper, the existing device mostly sticks the graphite paper to the inner wall of the mold through a high-temperature resistant tape. In the process of the hot pressing device squeezing the boron nitride powder downward, the boron nitride powder pushes the graphite paper downward through friction, so that the graphite paper is easily elongated under the action of friction and moves relative to the mold. After the excess graphite paper is accumulated in the mold, the probability of the graphite paper being scratched and damaged when the hot pressing device extrudes the boron nitride powder increases, resulting in the boron nitride powder directly contacting the mold and damaging it during the sintering process, affecting the normal production of boron nitride powder. Summary of the invention

[0003] The present invention provides a fully automatic hot pressing device for boron nitride ceramic parts, in order to overcome the disadvantage that graphite paper in the hot pressing device is easily scratched and damaged after being deformed.

[0004] The technical solution is: a fully automatic hot pressing device for boron nitride ceramic parts, comprising: a press, the press is provided with a fixed seat and a sliding seat; a feeding device, which is arranged on the fixed seat of the press and is used to convey powder; a movable die seat, which is arranged on the sliding seat of the press; a fixed die seat, which is arranged on the fixed seat of the press, and graphite paper is arranged on the inner side of the fixed die seat; a power mechanism, which is arranged on the press, and the power mechanism is provided with a feeding pipe, and the feeding pipe is connected to the feeding device through a hose; a feeding frame, which is fixedly connected and connected At the lower end of the feeding tube, the blanking frame is used to feed materials into the fixed mold base, and an electric push rod is fixedly connected to the feeding tube, and the telescopic end of the electric push rod is fixedly connected to the blanking frame; there are multiple sliding rods, which are slidably connected in the blanking frame, a spring is arranged between the sliding rod and the blanking frame, and an electric rotating shaft is arranged on the sliding rod; the number of rotating sleeves is twice that of the electric rotating shaft, and they are arranged on the electric rotating shaft; the number of detection mechanisms is the same as that of the sliding rods, which are arranged on the blanking frame and are used to detect the deformation of the graphite paper.

[0005] Furthermore, the detection mechanism includes: a T-shaped tube, slidably connected in the unloading frame, a spring is arranged between the T-shaped tube and the unloading frame; a detection frame, fixedly connected and connected to the T-shaped tube, the detection frame is provided with detection cavities, and the number of the detection cavities is twice that of the detection frames; a limit assembly, arranged on the T-shaped tube, for fixing the sliding rod; a pushing mechanism, the number of which is twice that of the detection frames, arranged on the T-shaped tube, the pushing mechanism is used to correct the offset of the graphite paper; a pressing mechanism, arranged on the unloading frame, for extruding the powder in advance.

[0006] Furthermore, a plurality of reinforcing ribs are arranged in the detection frame to increase the contact area between the detection frame and the graphite paper.

[0007] Furthermore, the limiting assembly includes: an L-shaped rod fixedly connected to the T-shaped tube, a limiting rod slidably connected in the blanking frame, the limiting rod and the sliding rod are limitedly matched, and the limiting rod and the L-shaped rod are extrusion-matched.

[0008] Furthermore, the detection mechanism also includes: a sealing plate, which is slidably connected to the blanking frame, a spring is arranged between the sealing plate and the blanking frame, a connecting cavity is arranged in the blanking frame, the sealing plate is located in the connecting cavity and slides, the T-shaped tube is connected to the connecting cavity, a through hole connected to the connecting cavity is arranged on the blanking frame, and the sealing plate is sealed and matched with the through hole.

[0009] Furthermore, the thickness of the sealing plate is greater than the diameter of the through hole on the blanking frame.

[0010] Furthermore, the pushing mechanism includes: a sliding tube, which is slidably connected and communicated with the T-shaped tube, and a tension spring is arranged between the sliding tube and the T-shaped tube; a detection tube, which is arranged on the detection frame, the detection tube is communicated with the detection cavity, and the detection tube is communicated with the sliding tube through a hose; a connecting rod, which is fixed to the sliding tube, and an adjustment frame is slidably connected to the electric rotating shaft, the adjustment frame is slidably connected to the rotating sleeve, and the adjustment frame is rotatably connected to an adjustment ring, and the adjustment ring is extruded and matched with the connecting rod; a pressure tube, which has multiple pressure tubes, which are fixed in the rotating sleeve, the pressure tube is slidably connected to the adjustment frame, and a tension spring is arranged between the pressure tube and the adjustment frame; an airbag, which is fixed in the rotating sleeve, the pressure tube is communicated with the airbag, and multiple friction strips are fixed to the outside of the airbag, and the friction strips are slidably matched with the rotating sleeve; a fixing component, which is arranged on the detection frame, and the fixing component is used to fix the edge of the graphite paper.

[0011] Furthermore, the plurality of friction strips on the same airbag together form a spiral structure, so that when the friction strips rotate with the rotating sleeve, the friction strips drive the graphite paper to move laterally.

[0012] Furthermore, the fixing component includes: an adjusting chamber fixedly connected to the detection frame, a fixing frame slidably connected in the adjusting chamber, a spring is provided between the adjusting chamber and the fixing frame, and the fixing frame is located in the detection chamber and slides; a partition plate slidably connected in the detection tube, and the detection tube is connected to the adjusting chamber on the same detection frame away from the detection tube through a hose.

[0013] Furthermore, the pressing mechanism includes: extrusion rods, the number of which is an integer multiple of the detection frame, slidably connected to the blanking frame, the blanking frame is provided with air cavities of the same number as the extrusion rods, the extrusion rods are located in the air cavities, and a spring is provided between the extrusion rods and the blanking frame; a pressing plate, the number of which is the same as the detection frame, fixedly connected to the blanking frame, the pressing plate is rotatably connected to a rotating plate, and a torsion spring is provided between the pressing plate and the rotating plate, and the extrusion rod is pressed and matched with the rotating plate; a positioning tube, fixedly connected to the blanking frame, the air cavity on the blanking frame is connected to the positioning tube through a hose, a positioning rod is slidably connected to the positioning tube, a spring is provided between the positioning rod and the positioning tube, and the positioning rod is pressed and matched with the fixed mold base.

[0014] The present invention has the following advantages: 1. In the process of adding powder into the fixed mold base, the present invention drives the rotating sleeve to rotate through the electric rotating shaft, so that the rotating sleeve squeezes the excess graphite paper upward, so that the graphite paper fits the inner side of the fixed mold base again, thereby reducing the probability of the graphite paper being scratched by the movable mold base.

[0015] 2. In the present invention, the detection frame attracts the graphite paper through negative pressure, so that the graphite paper is close to the detection frame, and then the detection frame is driven to move through the T-shaped tube, so that the detection frame stretches the graphite paper, ensuring that in the process of the rotating sleeve squeezing the graphite paper, the excess graphite paper will not be stacked and bent.

[0016] 3. When the graphite paper is offset and bent, the friction strip is squeezed by the airbag to make the friction strip protrude from the arc groove of the rotating sleeve, so that the friction strip drives the graphite paper to move toward the edge to flatten it, ensuring that the graphite paper covers the inner side of the fixed mold base. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the movable mold base and the power mechanism of the present invention; Figure 3 It is a three-dimensional structural cross-sectional view of the frame, graphite inner mold and graphite paper of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the feeding pipe, the unloading frame and the electric push rod of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the sliding rod and the electric rotating shaft of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the sliding rod, T-shaped tube and limiting rod of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the T-shaped tube, the detection frame and the detection tube of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the L-shaped rod, the limiting rod and the adjusting ring of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the fixing frame and the partition plate of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the pressure tube, the air bag and the friction strip of the present invention; Fig.11 It is a three-dimensional structural cross-sectional view of the rotating sleeve, the pressure tube and the air bag of the present invention; Fig.12 It is a three-dimensional structural schematic diagram of the extrusion rod, the pressing plate and the positioning tube of the present invention; Fig.13 It is a schematic diagram of the three-dimensional structure of the rotating plate and the positioning rod of the present invention; Fig.14 It is an exploded view of the three-dimensional structure of the pressing plate and the rotating plate of the present invention.

[0018] Wherein: 1-press, 2-feeding device, 3-movable die base, 4-fixed die base, 401-frame, 402-graphite inner die, 5-graphite paper, 6-power mechanism, 7-feeding pipe, 8-unloading frame, 9-electric push rod, 10-sliding rod, 11-electric rotating shaft, 12-rotating sleeve, 13-T-tube, 14-detection frame, 141-detection cavity, 15-L-shaped rod, 16-limiting rod, 17-sealing plate, 18-sliding tube, 19-detection tube, 20-connecting rod, 21-adjusting frame, 22-adjusting ring, 23-pressure tube, 24-airbag, 25-friction strip, 26-adjusting cavity, 27-fixed frame, 28-partition plate, 29-extrusion rod, 30-pressing plate, 31-rotating plate, 32-positioning tube, 33-positioning rod. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments. It should also be noted that, unless otherwise clearly specified and limited, terms such as: setting, installing, connecting, and connecting should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] A fully automatic hot pressing device for boron nitride ceramic parts, such as Figure 1-Figure 11 As shown, it includes: a press machine 1, on which a fixed seat and a sliding seat are arranged; a feeding device 2, which is arranged on the fixed seat of the press machine 1 and is used to convey powder; a movable die seat 3, which is arranged on the sliding seat of the press machine 1; a fixed die seat 4, which is arranged on the fixed seat of the press machine 1, and a graphite paper 5 is arranged inside the fixed die seat 4; a power mechanism 6, which is arranged on the press machine 1, and the power mechanism 6 is provided with a feeding pipe 7, and the feeding pipe 7 is connected to the feeding device 2 through a hose; a feeding frame 8, which is fixedly connected to and connected to the lower end of the feeding pipe 7, The blanking frame 8 is used to feed materials into the fixed mold base 4. An electric push rod 9 is fixedly connected to the feeding tube 7, and the telescopic end of the electric push rod 9 is fixedly connected to the blanking frame 8; there are multiple sliding rods 10, which are slidably connected in the blanking frame 8, a spring is arranged between the sliding rod 10 and the blanking frame 8, and an electric rotating shaft 11 is arranged on the sliding rod 10; the rotating sleeve 12, the number of which is twice that of the electric rotating shaft 11, is arranged on the electric rotating shaft 11; the detection mechanism, the number of which is the same as that of the sliding rod 10, is arranged on the blanking frame 8, and is used to detect the deformation of the graphite paper 5.

[0021] In the above scheme, the problem that the graphite paper 5 is easily scratched by the movable die base 3 after deformation or relative movement between the graphite paper 5 and the fixed die base 4 is solved. In the following, the relative movement of the graphite paper 5 is taken as an example. A sieve plate is provided on the fixed seat of the press 1. The sieve plate is provided with a plurality of through holes for separating excess boron nitride powder (hereinafter referred to as powder) when taking out the ceramic parts. A sieve can be provided in the feeding device 2. The sieve is used to screen large particles in the powder to prevent the large particles from entering the fixed die base 4 and affecting the normal molding of the ceramic parts. A solenoid valve is provided in the feeding device 2 for controlling The time when the powder enters the feeding tube 7 and the feeding amount; the movable die base 3 is used to squeeze the powder downward to compress the powder into a mold; the fixed die base 4 is composed of a frame 401 and four graphite inner molds 402, and the four graphite inner molds 402 together constitute the molding cavity of the ceramic part. The graphite paper 5 is located on the inner side of the graphite inner mold 402. An induction heater is arranged in the frame 401, and the induction heater is used to heat the powder to sinter the powder. A hydraulic push rod is arranged in the frame 401, and the hydraulic push rod is used to push the sintered ceramic part out of the molding cavity; the power mechanism 6 is composed of a hydraulic push rod and a sliding frame, and the telescopic end of the hydraulic push rod The feeding tube 7 is driven to move by the sliding frame. The cross section of the sliding frame is an F shape consisting of two vertical rods and a horizontal rod. The vertical rod on the right side of the sliding frame is slidably connected to the fixed seat of the press 1 to increase the support force of the feeding tube 7. The middle part of the feeding tube 7 is a corrugated tube. The blanking frame 8 is rectangular, and the projection area of ​​the blanking frame 8 on the horizontal plane is smaller than the area of ​​the cross section of the molding cavity, which is used to prevent the blanking frame 8 from contacting the graphite paper 5. The electric push rod 9 is used to drive the blanking frame 8 to move so that the blanking frame 8 enters the bottom of the molding cavity. The spring of the sliding rod 10 is used to provide the extrusion force of the rotating sleeve 12 on the graphite paper 5, so that The graphite paper 5 is fitted with the graphite inner mold 402; the electric shaft 11 is used to drive the rotating sleeve 12 to rotate, reducing the friction between the rotating sleeve 12 and the graphite paper 5 during relative movement; the detection mechanism attracts the graphite paper 5 through negative pressure, and determines whether the graphite paper 5 moves relative to each other by the change of the air pressure inside the detection mechanism. At the same time, the detection mechanism is used to adjust the position of the sliding rod 10, so that there is a gap between the rotating sleeve 12 and the graphite paper 5 when the blanking frame 8 moves downward, and the rotating sleeve 12 squeezes the graphite paper 5 when the blanking frame 8 moves upward, ensuring that the graphite paper 5 is fitted with the side wall of the graphite inner mold 402.

[0022] Workflow: This section describes the direction of the embodiment of the reference Figure 4When producing ceramic parts, the staff starts the power mechanism 6, and the power mechanism 6 drives the blanking frame 8 to move to the top of the molding cavity through the feeding pipe 7. The electric push rod 9 drives the blanking frame 8 and the parts thereon to move downward, and the bellows in the feeding pipe 7 is stretched, and the blanking frame 8 enters the molding cavity. After the blanking frame 8 moves to the bottom of the molding cavity, the detection mechanism absorbs the graphite paper 5 through negative pressure. If there is no relative movement between the graphite paper 5 and the fixed mold base 4, the air pressure in the detection mechanism remains basically unchanged at this time, and the electric push rod 9 drives the blanking frame 8 to move upward normally. During this process, the solenoid valve in the feeding device 2 is opened. The powder enters the molding cavity through the blanking frame 8 until the blanking frame 8 moves out of the molding cavity and is filled with powder. Then the solenoid valve in the loading device 2 is closed, and the power mechanism 6 drives the blanking frame 8 to move in the opposite direction and reset. After the blanking frame 8 is reset, the staff starts the press 1 and the induction heater in the frame 401. The sliding seat of the press 1 drives the movable die base 3 to move downward. The movable die base 3 extrude the powder and mold it. The heater heats and sinters the powder in the molding cavity. After the ceramic part is sintered, the sliding seat drives the movable die base 3 to move upward and reset. The staff turns off the heater and takes out the ceramic part.

[0023] If there is relative movement of the graphite paper 5, the graphite paper 5 hinders the normal air suction of the detection mechanism, the air pressure in the detection mechanism is reduced and the limit on the sliding rod 10 is released. The sliding rod 10 drives the electric shaft 11 and the rotating sleeve 12 to move forward and squeeze the graphite paper 5 under the push of the adjacent spring, until the rotating sleeve 12 contacts the graphite paper 5 and then starts the electric shaft 11. The electric shaft 11 drives the rotating sleeve 12 to rotate, so that the rotating sleeve 12 pushes the excess graphite paper 5 upward. At this time, the position where the graphite paper 5 is squeezed by the rotating sleeve 12 contacts the graphite inner mold 402, so that the graphite paper 5 after the rotating sleeve 12 passes is flatly attached to the adjacent surface of the graphite inner mold 402, and the electric push rod 9 drives the blanking frame 8 to move upward and discharge the material until the blanking frame 8 moves out of the molding cavity. At this time, the rotating sleeve 12 pushes the excess graphite paper 5 out of the molding cavity, and the staff closes the solenoid valve of the feeding device 2 to stop the material discharge, the detection mechanism stops sucking the graphite paper 5, and pushes the sliding rod 10 to move backward to reset, and then repeats the above process to sinter the powder.

[0024] Further, such as Figure 4-Figure 9 As shown, the detection mechanism includes: a T-shaped tube 13, which is slidably connected in the blanking frame 8, and a spring is arranged between the T-shaped tube 13 and the blanking frame 8; a detection frame 14, which is fixedly connected and connected to the T-shaped tube 13, and the detection frame 14 is provided with detection cavities 141, and the number of detection cavities 141 is twice that of the detection frame 14; a limit assembly, which is arranged on the T-shaped tube 13 and is used to fix the sliding rod 10; a pushing mechanism, which is twice the number of the detection frames 14 and is arranged on the T-shaped tube 13, and the pushing mechanism is used to correct the offset graphite paper 5; a pressing mechanism, which is arranged on the blanking frame 8 and is used to extrude the powder in advance.

[0025] Further, such as Figure 4-Figure 6 and Fig. 9 As shown, a plurality of reinforcing ribs are arranged in the detection frame 14 to increase the contact area between the detection frame 14 and the graphite paper 5 .

[0026] In the above scheme, after relative movement occurs between the graphite paper 5 and the fixed mold base 4, the detection frame 14 attracts the graphite paper 5 to move and stretch it through negative pressure, thereby facilitating the rotating sleeve 12 to push the graphite paper 5 to move. A sliding groove is provided in the blanking frame 8, and the T-shaped tube 13 slides in the sliding groove. The sliding groove is used to provide space for the T-shaped tube 13 to move; the detection frame 14 is used to stretch the graphite paper 5 to reduce the probability of the graphite paper 5 being folded when the rotating sleeve 12 pushes the graphite paper 5 upward. The two ends of the detection frame 14 are provided with detection cavities 141, and the detection cavity 141 is used to detect whether the position of the edges on both sides of the graphite paper 5 is offset; the limit assembly is used to fix the position of the sliding rod 10 and to move between the graphite paper 5 and the graphite inner mold 40 2, the fixing of the sliding rod 10 is released; when the graphite paper 5 is detected to be offset or wrinkled, taking the graphite paper 5 offset to the right as an example, the pushing mechanism drives the graphite paper 5 to calibrate to the left to ensure that the graphite paper 5 can cover the surface of the graphite inner mold 402; the pressing mechanism is used to extrude the powder at the bottom of the molding cavity in advance, so that the powder at the bottom of the molding cavity squeezes the lower edge of the graphite paper 5, increases the fixing force on the lower part of the graphite paper 5, thereby strengthening the fixing effect of the graphite paper 5, and the reinforcing ribs are evenly distributed on the edge of the detection frame 14, which is used to increase the supporting points of the detection frame 14 on the graphite paper 5, complete the multi-point support of the graphite paper 5, thereby reducing the degree of the graphite paper 5 sinking into the detection frame 14.

[0027] Further, such as Figure 8 As shown, the limiting assembly includes: an L-shaped rod 15 fixedly connected to the T-shaped tube 13, a limiting rod 16 slidably connected in the blanking frame 8, the limiting rod 16 and the sliding rod 10 are limitedly matched, and the limiting rod 16 and the L-shaped rod 15 are squeezed and matched.

[0028] In the above scheme, in order to control the timing of movement of the sliding rod 10, the horizontal part of the L-shaped rod 15 is provided with an inclined surface, which is used to gradually push the limiting rod 16 to move upward, and the L-shaped rod 15 is provided with a T-shaped groove, which is used to allow the limiting rod 16 to pass through the L-shaped rod 15. A limiting hole is provided on the sliding rod 10, and an inclined surface is provided in the limiting hole, and the inclination direction of the inclined surface gradually deviates downward from the side away from the electric rotating shaft 11 to the side close to the electric rotating shaft 11. The lower end of the limiting rod 16 is a ball head, which is used to reduce the wear of the limiting rod 16 when entering the limiting hole.

[0029] Further, such as Figure 5As shown, the detection mechanism also includes: a sealing plate 17, which is slidably connected in the blanking frame 8, a spring is arranged between the sealing plate 17 and the blanking frame 8, a connecting cavity is arranged in the blanking frame 8, the sealing plate 17 is located in the connecting cavity and slides, the T-shaped tube 13 is connected with the connecting cavity, a through hole connected with the connecting cavity is arranged on the blanking frame 8, and the sealing plate 17 is sealed and matched with the through hole.

[0030] Further, such as Figure 5 As shown, the thickness of the sealing plate 17 is greater than the diameter of the through hole on the blanking frame 8 .

[0031] In the above scheme, an air pump is provided on the press machine 1 to adjust the suction force of the detection frame 14 on the graphite paper 5 and reduce the attraction force of the detection frame 14 on the powder. The sealing plate 17 is provided with a through hole, which is connected to the air pump through a hose. The through hole on the blanking frame 8 is used to provide part of the gas from the outside to the connecting cavity to reduce the rate at which the detection frame 14 extracts gas from the outside, thereby reducing the absorption of the powder by the detection frame 14. A filter is provided in the T-tube 13 to filter the powder. The staff cleans the filter regularly. After the sealing plate 17 seals the through hole on the blanking frame 8, the fixing force of the detection frame 14 on the graphite paper 5 is increased to ensure that the graphite paper 5 will not separate from the detection frame 14 during the upward movement of the blanking frame 8. The thickness of the sealing plate 17 is greater than the diameter of the through hole on the blanking frame 8 to ensure that the through hole in the blanking frame 8 can be completely sealed.

[0032] Working process: after the above-mentioned blanking frame 8 enters the forming cavity, the air pump extracts the gas in the connecting cavity, so that the T-shaped tube 13 absorbs the graphite paper 5 by extracting the gas from the detection frame 14, and drives the excess part of the graphite paper 5 to move toward the detection frame 14. When the graphite paper 5 fits the detection frame 14, the graphite paper 5 seals the detection frame 14, so that the gas cannot enter the detection frame 14, and the air pressure in the connecting cavity is reduced, so that the T-shaped tube 13 drives the detection frame 14 to move toward the inside of the blanking frame 8 and compresses the adjacent spring until the sealing plate 17 seals the through hole of the connecting cavity on the blanking frame 8. The sealing plate 17 stops moving. At this time, the negative pressure inside the detection frame 14 increases, which increases the adsorption force of the detection frame 14 on the graphite paper 5, thereby preventing the graphite paper 5 from falling off. When the air pressure in the connecting cavity in the blanking frame 8 reaches the specified value, the air pump stops extracting the gas in the connecting cavity of the blanking frame 8.

[0033] After the sealing plate 17 stops moving, the air pressure in the sliding groove of the blanking frame 8 decreases, so that the T-shaped tube 13 drives the detection frame 14 to move inward and compress the spring, and the detection frame 14 drives the graphite paper 5 to move and stretch it. At this time, the graphite paper 5 is separated from the graphite inner mold 402. In this process, the T-shaped tube 13 drives the L-shaped rod 15 to move synchronously, so that the L-shaped rod 15 presses the limit rod 16 upward, and the limit rod 16 is gradually separated from the limit hole of the sliding rod 10 and compresses the adjacent spring, so that the sliding rod 10 moves under the push of the adjacent spring and drives the rotating sleeve 12 to squeeze the graphite paper 5, so that the graphite paper 5 fits the graphite inner mold 402. As the blanking frame 8 drives the parts thereon to move upward, the detection frame 14 moves upward relative to the graphite paper 5 and drives its redundant part to move upward synchronously, so that the graphite paper 5 is always in a flattened state, ensuring that the graphite paper 5 below the rotating sleeve 12 is in contact with the graphite inner mold 402, until the blanking frame 8 moves to the upper edge of the molding cavity and the air pump is turned off, the air pressure in the detection frame 14 is restored and separated from the graphite paper 5, the sealing plate 17 moves forward and resets under the push of the adjacent springs, the T-shaped tube 13 drives the detection frame 14 to reset under the push of the adjacent springs, the limiting rod 16 stops squeezing the L-shaped rod 15, and the L-shaped rod 15 squeezes the limiting hole of the sliding rod 10 under the push of the adjacent springs, so that the sliding rod 10 drives the parts on it to move backward and reset and compress the adjacent springs.

[0034] Further, such as Figure 4-Figure 11 As shown, the pusher mechanism includes: a sliding tube 18, which is slidably connected and communicated with the T-shaped tube 13, and a tension spring is arranged between the sliding tube 18 and the T-shaped tube 13; a detection tube 19, which is arranged on the detection frame 14, and the detection tube 19 is communicated with the detection cavity 141, and the detection tube 19 is communicated with the sliding tube 18 through a hose; a connecting rod 20, which is fixed to the sliding tube 18, and an adjustment frame 21 is slidably connected to the electric rotating shaft 11, and the adjustment frame 21 is slidably connected to the rotating sleeve 12, and the adjustment frame 21 is rotatably connected to the adjustment ring 22 , the adjusting ring 22 is squeezed and matched with the connecting rod 20; the pressure tube 23, which has multiple parts, is fixed in the rotating sleeve 12, the pressure tube 23 is slidably connected to the adjusting frame 21, and a tension spring is arranged between the pressure tube 23 and the adjusting frame 21; the airbag 24 is fixed in the rotating sleeve 12, the pressure tube 23 is communicated with the airbag 24, and multiple friction strips 25 are fixed to the outside of the airbag 24, and the friction strips 25 are slidably matched with the rotating sleeve 12; a fixing component is arranged on the detection frame 14, and the fixing component is used to fix the edge of the graphite paper 5.

[0035] Further, such as Figure 4-Figure 7 , Fig. 9 and Fig.10 As shown, a plurality of friction strips 25 on the same airbag 24 together form a spiral structure, which is used for driving the graphite paper 5 to move laterally when the friction strips 25 rotate with the rotating sleeve 12 .

[0036] In the above scheme, it is used to push the graphite paper 5 to move horizontally to ensure that the graphite paper 5 covers the graphite inner mold 402; the connecting rod 20 is spliced ​​by two L-shaped folding rods, and the adjusting ring 22 is provided with a transverse plate, the transverse plate of the adjusting ring 22 is squeezed and matched with the connecting rod 20, and the length of the transverse plate is greater than the distance that the sliding rod 10 moves relative to the blanking frame 8, ensuring that after the sliding rod 10 drives the rotating sleeve 12 to move, the transverse plate of the adjusting ring 22 can still contact with the connecting rod 20; the pressure tube 23 is used to replenish gas into the airbag 24 to expand the airbag 24. After the airbag 24 expands, it drives the friction strip 25 to move, so that the friction strip 25 contacts with the graphite paper 5, and the roughness of the surface of the friction strip 25 is greater than the roughness of the surface of the rotating sleeve 12, ensuring that the friction strip 25 can drive the graphite paper 5 horizontally The rotating sleeve 12 moves in the direction of rotation, and the surface of the rotating sleeve 12 is provided with an arc groove of the same shape as the friction strip 25, and the depth of the arc groove is greater than the thickness of the friction strip 25, so that before the airbag 24 is not inflated, the surface of the friction strip 25 does not contact the graphite paper 5, and when the airbag 24 is inflated, the friction strip 25 passes through the arc groove and contacts the graphite paper 5; the fixing component is used to increase the friction force when the edge of one side of the graphite paper 5 moves when the friction strip 25 drives the edge of the graphite paper 5 to move, thereby fixing the edge of the graphite paper 5 and ensuring that the graphite paper 5 does not move too far. The deflection angle of the friction strip 25 is less than 10°, which is used to reduce the lateral thrust of a single friction strip 25 on the graphite paper 5 during its rotation, thereby reducing the probability of the graphite paper 5 being deformed by the lateral force.

[0037] Further, such as Figure 7 and Fig. 9 As shown, the fixed component includes: an adjusting chamber 26, which is fixed to the detection frame 14, and a fixing frame 27 is slidably connected in the adjusting chamber 26, a spring is provided between the adjusting chamber 26 and the fixing frame 27, and the fixing frame 27 is located in the detection chamber 141 and slides; a partition plate 28, which is slidably connected in the detection tube 19, and the detection tube 19 is connected to the adjusting chamber 26 away from the detection tube 19 on the same detection frame 14 through a hose.

[0038] In the above scheme, the following Figure 4 Taking the movement direction of the front part as an example, it is used to fix the right side of the graphite paper 5 in the process of driving it to move to the left, so as to prevent the graphite paper 5 from moving a large distance, resulting in the right edge of the graphite paper 5 being unable to completely cover the graphite inner mold 402. Taking the rightward deviation of the graphite paper 5 as an example, the roughness of the surface of the fixing frame 27 is greater than the roughness of the surface of the friction strip 25, and the front side of the fixing frame 27 is initially flush with the outer side of the adjacent detection frame 14; the partition plate 28 divides the adjacent detection tube 19 into two front and rear chambers (such as Figure 8As shown in the figure, the regulating chamber 26 is connected to the rear chamber of the detection tube 19, and the regulating chamber 26 and the detection tube 19 in the same component are respectively connected to different detection chambers 141 on the same detection frame 14, ensuring that when the graphite paper 5 is driven to move to the left, the right edge of the graphite paper 5 is in a fixed state.

[0039] Workflow: This section considers Figure 5 Direction is used as a reference. When the graphite paper 5 deviates to the right, the deviation of the graphite paper 5 is taken as an example. In the above-mentioned process of pushing the graphite paper 5 upward, after the graphite paper 5 seals the two detection chambers 141, the air pressure in the detection chamber 141 decreases, and the air pressure in the detection tube 19 decreases synchronously. The partition plate 28 moves forward and reduces the air pressure in the connected adjustment chamber 26, so that the fixed frame 27 gradually enters the adjustment chamber 26 and compresses the adjacent spring. When the partition plate 28 cannot move, the sliding tube 18 enters the T-tube 13 and stretches the adjacent tension spring. The sliding tube 18 drives the connecting rod 20 to stop squeezing the adjustment ring 22, and the tension spring drives the adjustment frame 21 to move to the right and reset, so that the pressure tube 23 extracts the gas in the airbag 24, so that the airbag 24 shrinks and drives the friction strip 25 to move synchronously. When the graphite paper 5 is offset, the graphite paper 5 cannot block the detection chamber 141 on the left. The detection chamber 141 is connected to the outside world and the air pressure therein increases. The air in the detection tube 19 on the left The pressure is restored, and the right side fixing frame 27 moves forward under the push of the spring, and the right side adjusting chamber 26 extracts the gas in the rear chamber on the left side detection tube 19, so that the partition plate 28 moves backward and resets. After the right side fixing frame 27 is extended, it contacts the right edge of the graphite paper 5, increasing the resistance when the right edge of the graphite paper 5 moves. At the same time, the sliding tube 18 moves to the left and resets under the drive of the adjacent tension spring, so that the connecting rod 20 drives the adjusting frame 21 to move by squeezing the adjusting ring 22. The adjusting frame 21 pushes the gas in the pressure tube 23 into the airbag 24 and stretches the adjacent tension spring. The expansion of the airbag 24 drives the friction strip 25 to move and protrude from the surface of the rotating sleeve 12, so that the friction strip 25 contacts the graphite paper 5. In the process of rotating with the rotating sleeve 12, the friction strip 25 pulls the graphite paper 5 to the left, thereby completing the correction of the graphite paper 5, until the graphite paper 5 seals the detection chamber 141 again, and the fixing frame 27 and the friction strip 25 repeat the above process to reset.

[0040] Further, such as Figure 12-14As shown, the pressing mechanism includes: extrusion rods 29, the number of which is an integer multiple of the detection frame 14, which are slidably connected in the blanking frame 8, and the blanking frame 8 is provided with air cavities of the same number as the extrusion rods 29, the extrusion rods 29 are located in the air cavities, and a spring is provided between the extrusion rods 29 and the blanking frame 8; a pressing plate 30, the number of which is the same as the detection frame 14, is fixed to the blanking frame 8, the pressing plate 30 is rotatably connected with a rotating plate 31, and a torsion spring is provided between the pressing plate 30 and the rotating plate 31, and the extrusion rod 29 is pressed and matched with the rotating plate 31; a positioning tube 32, which is fixed to the blanking frame 8, the air cavity on the blanking frame 8 is connected to the positioning tube 32 through a hose, a positioning rod 33 is slidably connected in the positioning tube 32, a spring is provided between the positioning rod 33 and the positioning tube 32, and the positioning rod 33 is pressed and matched with the fixed mold base 4.

[0041] In the above scheme, before adjusting the position of the graphite paper 5, the lower edge of the graphite paper 5 is fixed to ensure that the lower edge of the graphite paper 5 will not move upward with the rotating sleeve 12, so that the graphite paper 5 is close to the graphite inner mold 402. The lower end of the extrusion rod 29 is a ball head, which is used to reduce the wear caused by the extrusion rod 29 when the extrusion rod 29 squeezes the rotating plate 31. A sealing ring can be provided on the upper part of the extrusion rod 29 to increase the sealing between it and the air cavity; the pressing plate 30 is used to limit the height of the powder at the edge of the graphite paper 5, and the rotating plate 31 is used to push the powder to the edge of the graphite paper 5 and compact it, so that the compacted powder fixes the graphite paper 5. The torsion spring is used to ensure that the rotating plate 31 is in a horizontal state at the beginning, so that the rotating plate 31 will not hinder the movement of the powder, and the intersections of adjacent rotating plates 31 are all stepped, which is used to ensure that no gap will appear after it rotates; the positioning tube 32 is filled with gas, which is used to transport gas to the air cavity in the lower material frame 8, and the air pressure in the air cavity increases and pushes the extrusion rod 29 to move downward.

[0042] Working process: in the process of the above-mentioned blanking frame 8 moving downward, when the positioning rod 33 contacts the graphite inner mold 402, the blanking frame 8 stops moving and delivers a certain amount of powder into the molding cavity, and then the blanking frame 8 continues to move downward, the positioning rod 33 enters the positioning tube 32 and compresses the adjacent spring, the gas in the positioning tube 32 enters the air cavity and pushes the extrusion rod 29 to move downward, the extrusion rod 29 moves and compresses the adjacent spring, and at the same time, the extrusion rod 29 squeezes the rotating plate 31 downward to store the torsion spring on it, and the rotating plate 31 rotates and pushes the powder under the pressing plate 30, so that the powder gathers under the pressing plate 30, and at the same time, the rotating plate 31 squeezes the gathered powder during the rotation process, so that the powder fixes the edge of the graphite paper 5, until the extrusion rod 29 cannot move and the blanking frame 8 stops moving, and then the above process is repeated to adjust the graphite paper 5. In this process, the extrusion force on the positioning rod 33 is reduced and reset under the push of the spring, the extrusion rod 29 is reset under the action of the adjacent spring, and the rotating plate 31 is reset under the action of the torsion spring.

[0043] The technical principles of the embodiments of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the embodiments of the present invention and cannot be interpreted in any way as limiting the protection scope of the embodiments of the present invention. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the embodiments of the present invention without creative work, and these methods will fall within the protection scope of the embodiments of the present invention.

Claims

1. A fully automatic hot pressing device for boron nitride ceramic parts, characterized in that: Included are: A press machine (1), wherein the press machine (1) is provided with a fixed seat and a sliding seat; A feeding device (2) is arranged on a fixed seat of the press (1) and is used for conveying powder; A movable die base (3) is arranged on a sliding base of the press (1); A fixed die base (4) is arranged on a fixed base of the press (1), and graphite paper (5) is arranged inside the fixed die base (4); A power mechanism (6) is arranged on the press (1), the power mechanism (6) is provided with a feeding pipe (7), and the feeding pipe (7) is connected to the feeding device (2) through a hose; A material discharge frame (8) is fixedly connected to and communicated with the lower end of the feeding pipe (7), the material discharge frame (8) is used to feed materials into the fixed mold base (4), an electric push rod (9) is fixedly connected to the feeding pipe (7), and the telescopic end of the electric push rod (9) is fixedly connected to the material discharge frame (8); A plurality of sliding rods (10) are slidably connected to the blanking frame (8); a spring is provided between the sliding rod (10) and the blanking frame (8); and an electric rotating shaft (11) is provided on the sliding rod (10); Rotating sleeves (12), the number of which is twice the number of the electric rotating shafts (11), and are arranged on the electric rotating shafts (11); The detection mechanism, the number of which is the same as that of the sliding rods (10), is arranged on the blanking frame (8) and is used to detect the deformation amount of the graphite paper (5).

2. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 1, characterized in that: The detection mechanism includes: A T-shaped tube (13) is slidably connected in the blanking frame (8), and a spring is provided between the T-shaped tube (13) and the blanking frame (8); A detection frame (14) is fixedly connected to and communicated with the T-shaped tube (13); the detection frame (14) is provided with detection cavities (141); the number of the detection cavities (141) is twice that of the detection frame (14); A limiting assembly, arranged on the T-shaped tube (13) and used for fixing the sliding rod (10); Pushing mechanisms, the number of which is twice that of the detection racks (14), are arranged on the T-shaped tube (13), and the pushing mechanisms are used to correct the deflected graphite paper (5); The material pressing mechanism is arranged on the material discharge frame (8) and is used for pressing the powder material in advance.

3. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 2, characterized in that: A plurality of reinforcing ribs are arranged inside the detection frame (14) for increasing the contact area between the detection frame (14) and the graphite paper (5).

4. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 2, characterized in that: The limit assembly includes: The L-shaped rod (15) is fixedly connected to the T-shaped tube (13), and a limiting rod (16) is slidably connected in the blanking frame (8). The limiting rod (16) is limitedly matched with the sliding rod (10), and the limiting rod (16) is pressed and matched with the L-shaped rod (15).

5. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 4, characterized in that: The detection mechanism also includes: A sealing plate (17) is slidably connected in the blanking frame (8), a spring is provided between the sealing plate (17) and the blanking frame (8), a connecting cavity is provided in the blanking frame (8), the sealing plate (17) is located in the connecting cavity and slides, the T-shaped tube (13) is connected with the connecting cavity, a through hole connected with the connecting cavity is provided on the blanking frame (8), and the sealing plate (17) is in sealing cooperation with the through hole.

6. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 5, characterized in that: The thickness of the sealing plate (17) is greater than the diameter of the through hole on the blanking frame (8).

7. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 5, characterized in that: The pushing mechanism comprises: a sliding tube (18) slidably connected to and communicated with the T-shaped tube (13), wherein a tension spring is provided between the sliding tube (18) and the T-shaped tube (13); A detection tube (19) is arranged on the detection frame (14), the detection tube (19) is in communication with the detection chamber (141), and the detection tube (19) is in communication with the sliding tube (18) via a hose; A connecting rod (20) is fixedly connected to the sliding tube (18); an adjusting frame (21) is slidably connected to the electric rotating shaft (11); the adjusting frame (21) is slidably connected to the rotating sleeve (12); the adjusting frame (21) is rotatably connected to an adjusting ring (22); the adjusting ring (22) is extrusion-fitted with the connecting rod (20); A plurality of pressure tubes (23) are fixedly connected to the rotating sleeve (12); the pressure tubes (23) are slidably connected to the adjusting frame (21); and a tension spring is provided between the pressure tubes (23) and the adjusting frame (21); An airbag (24) is fixedly connected inside the rotating sleeve (12); the pressure pipe (23) is in communication with the airbag (24); a plurality of friction strips (25) are fixedly connected to the outside of the airbag (24); the friction strips (25) are in sliding cooperation with the rotating sleeve (12); A fixing component is arranged on the detection frame (14), and the fixing component is used to fix the edge of the graphite paper (5).

8. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 7, characterized in that: The plurality of friction strips (25) on the same airbag (24) together form a spiral structure, and are used for driving the graphite paper (5) to move laterally when the friction strip (25) rotates with the rotating sleeve (12).

9. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 7, characterized in that: The fixing assembly comprises: An adjusting cavity (26) is fixedly connected to the detection frame (14); a fixing frame (27) is slidably connected in the adjusting cavity (26); a spring is provided between the adjusting cavity (26) and the fixing frame (27); and the fixing frame (27) is slidably located in the detection cavity (141); The partition plate (28) is slidably connected inside the detection tube (19), and the detection tube (19) is connected to the regulating chamber (26) on the same detection frame (14) away from the detection tube (19) through a hose.

10. The fully automatic hot pressing device for boron nitride ceramic parts according to claim 9, characterized in that: The pressing mechanism comprises: Extrusion rods (29), the number of which is an integral multiple of the detection frame (14), are slidably connected to the blanking frame (8), the blanking frame (8) is provided with air cavities the same number as the number of the extrusion rods (29), the extrusion rods (29) are located in the air cavities, and a spring is provided between the extrusion rods (29) and the blanking frame (8); The pressing plates (30) are the same in number as the detection frames (14) and are fixedly connected to the blanking frame (8). The pressing plates (30) are rotatably connected to the rotating plates (31), and a torsion spring is provided between the pressing plates (30) and the rotating plates (31). The extrusion rods (29) are extrusion-matched with the rotating plates (31); A positioning tube (32) is fixedly connected to the blanking frame (8); an air cavity on the blanking frame (8) is connected to the positioning tube (32) via a hose; a positioning rod (33) is slidably connected inside the positioning tube (32); a spring is provided between the positioning rod (33) and the positioning tube (32); and the positioning rod (33) is extrusion-fitted with the fixed mold base (4).

Images