A potassium superoxide hot pressing mold

Abstract

This invention relates to the field of potassium superoxide preparation technology, specifically to a potassium superoxide hot pressing molding die, comprising a base, a lower mold plate, a middle mold plate, an upper mold plate, and a pressure plate. An oil reservoir is mounted on the base via a bracket, located between the lower and middle mold plates. A guide cavity adapted to the direction of the upper pressing punch is provided on the lower end face of the upper guide rail, and an oil storage cavity is provided on the upper end face of the upper guide rail. Multiple oiling nozzles are installed on the inner bottom of the oil storage cavity and the inner sidewall of the oil reservoir. The outer ends of the oiling nozzles on the oil storage cavity are in elastic contact with the top of the upper pressing punch, and the outer ends of the oiling nozzles on the oil reservoir are in elastic contact with the outer wall of the lower pressing punch. This invention, with its oil storage cavity, oil reservoir, and oiling nozzles with spring and steel ball structures, enables automatic oiling during the reciprocating motion of the pressing punch, reducing friction and wear on the pressing punch, ensuring stable pressing stroke, and improving the consistency of the thickness and density of the formed blank.

Description

Technical Field

[0001] This invention relates to the field of potassium superoxide preparation technology, specifically a potassium superoxide hot pressing molding die. Background Technology

[0002] Potassium superoxide is a high-performance inorganic peroxide with extremely strong oxidizing activity and excellent carbon dioxide adsorption and oxygen release performance. It can consume carbon dioxide and continuously release oxygen through chemical reactions in a closed environment. It is a core oxygen supply material in aerospace, submarine sealed compartments, mine rescue, fire self-rescue, medical emergency and other fields, and has irreplaceable application value.

[0003] In actual industrial preparation, pure potassium superoxide powder has poor flowability, loose texture, and extremely poor formability, making it impossible to directly produce molded parts with regular structure, uniform density, and qualified mechanical strength. Therefore, the industry generally mixes potassium superoxide powder with special binders, functional additives, stabilizers, and other auxiliary materials in a uniform ratio to prepare potassium superoxide composite powder, which is then processed into sheet or block molded bodies of fixed specifications through a pressing molding process to meet the assembly and use requirements of oxygen supply devices.

[0004] Chinese utility model patent CN219171774U discloses a single-layer tablet press for chemical powders, including a tablet press housing, a tablet press base, a rotating shaft, a tablet press top seat, an upper turntable, a tablet pressing disc, a lower turntable, an upper punch, and a lower punch. The tablet press base and the tablet press top seat are fixed inside the tablet press housing. The rotating shaft is positioned between the tablet press base and the tablet press top seat and rotates on a fixed axis. The rotating shaft is coaxially fitted with the lower turntable, the tablet pressing disc, and the upper turntable, which can rotate synchronously, from bottom to top. An upper punch that can move up and down is vertically mounted on the upper turntable, and a lower punch that can move up and down is vertically mounted on the lower turntable. The upper and lower punches can extend into the die holes of the tablet pressing disc to compress tablets.

[0005] In the aforementioned existing tableting device, the rotating upper and lower connecting belts continuously maintain contact with the outer wall of the punch during operation. The pre-set contour shape of the connecting belts drives the punch to reciprocate axially, thereby achieving periodic pressing, pressure holding, and return demolding of the potassium superoxide powder within the mold cavity, completing the powder pressing and molding process. However, during long-term continuous cyclic operation, the punch and connecting belts continuously generate sliding friction and extrusion contact, easily causing wear and scratches on the punch's working surface. In severe cases, irreversible damage such as scratches and material peeling may occur on the punch surface. Worn punches exhibit unstable pressing strokes and large deviations in vertical displacement accuracy, directly leading to increased thickness deviations in the formed blank, poor consistency in pressing depth, and uneven density distribution within the blank, significantly reducing the molding accuracy and stability of potassium superoxide molded products. Under extreme conditions, punch movement may even become stuck, forcing equipment shutdown for maintenance, severely impacting production continuity and significantly increasing equipment maintenance costs and production losses. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention proposes a potassium superoxide hot pressing mold, which aims to reduce wear between parts and ensure the stability of the stamping stroke and the uniformity of the density of the formed blank.

[0007] To solve the above-mentioned technical problems, the present invention includes a base, a lower die plate, a middle die plate, an upper die plate, and a pressure plate arranged sequentially from bottom to top. Multiple upper pressing punches are distributed circumferentially around the outer edge of the upper die plate. An upper guide rail is provided on the top of the pressure plate to guide the movement of each upper pressing punch. Several lower pressing punches, corresponding one-to-one with the upper pressing punches, are provided on the outer edge of the lower die plate. A lower guide rail is provided on the top of the base to guide the movement of the lower pressing punches. An oil storage box is mounted on the base via a bracket. Between the lower die plate and the middle die plate, the lower end face of the upper guide rail is provided with a guide cavity adapted to the direction of the upper pressing punch. The upper end face of the upper guide rail is provided with an oil storage cavity. Multiple oiling nozzles are installed on the bottom wall of the oil storage cavity and the side wall of the oil storage box. Each oiling nozzle is connected to the inner cavity of the corresponding oil storage cavity or oil storage box. The outer end of the oiling nozzle at the oil storage cavity elastically abuts against the upper pressing punch passing through the guide cavity. The outer end of the oiling nozzle at the oil storage box elastically abuts against the lower pressing punch passing through the oil storage box.

[0008] Preferably, the oiling nozzle includes a housing and a steel ball. The outer wall of the housing is provided with multiple oil passage holes communicating with its own internal cavity. The inner bottom of the oil storage cavity and the inner side wall of the oil storage box are provided with multiple threaded holes. The end of each threaded hole is provided with a spherical cavity. The spherical cavity communicates with the guide cavity or the outer wall of the oil storage box. The steel ball is embedded in the corresponding spherical cavity. The housing is installed in the corresponding threaded hole. A guide post is provided in the center of the housing. A spring is sleeved on the guide post. The spring pushes the steel ball. The steel ball abuts against the corresponding upper or lower pressing punch.

[0009] Preferably, the upper end face of the middle mold plate is provided with a plurality of second cylindrical cavities corresponding one-to-one with the upper pressing punch, and the lower end face of the middle mold plate is provided with a third through hole communicating with the corresponding second cylindrical cavity, and a pressing mold is embedded inside each of the second cylindrical cavities.

[0010] Preferably, the outer wall of the pressing mold is provided with a limiting ring groove, and the outer wall of the middle mold plate is provided with a plurality of first countersunk holes that connect to the corresponding second cylindrical cavities. The first countersunk holes are fitted with locking bolts that are adapted to the limiting ring groove.

[0011] Preferably, the bottom of the pressing mold is conical, and the outer wall of the middle mold plate is provided with a plurality of second countersunk holes that connect to the corresponding second cylindrical cavities. The second countersunk holes are fitted with demolding bolts that are adapted to the conical bottom of the pressing mold.

[0012] Preferably, the lower end face of the upper die plate is provided with a plurality of first cylindrical cavities coaxially arranged with the corresponding upper pressing punches, the upper end face of the upper die plate is provided with a plurality of second through holes communicating with the corresponding first cylindrical cavities, the upper end face of the lower die plate is provided with a plurality of third cylindrical cavities coaxially arranged with the corresponding lower pressing punches, and the lower end face of the lower die plate is provided with a plurality of fourth through holes communicating with the corresponding third cylindrical cavities. Bushings are embedded inside the first and third cylindrical cavities, and the bushings are correspondingly sleeved on the outside of the upper and lower pressing punches.

[0013] Preferably, the bushing has multiple cavities circumferentially formed on its shaft, and each cavity is filled with a lubricating block.

[0014] Preferably, the lower end face of the upper mold plate is fixed with an oil sealing plate that supports the corresponding bushing, and the upper end face of the lower mold plate is fixed with a pressing plate that presses the corresponding bushing.

[0015] Preferably, a sealing gasket is embedded inside the first cylindrical cavity, the sealing gasket is sleeved on the outside of the upper pressing punch, and the sealing gasket is sandwiched between the oil sealing plate and the corresponding bushing.

[0016] Preferably, a thrust bearing is embedded in the upper end face of the upper mold plate, and the upper guide rail is attached to the thrust bearing.

[0017] After adopting the above technical solution, the beneficial effects of the present invention are: This invention features an oil storage chamber, an oil storage box, and an oiling nozzle with a spring and steel ball structure. It can automatically apply oil during the reciprocating motion of the pressing punch, changing the traditional manual intermittent oil replenishment mode, reducing friction and wear between the upper and lower pressing punches, preventing the pressing punch from jamming, ensuring stable stamping stroke, and improving the consistency of the thickness and density of the formed blank. Attached Figure Description

[0018] To clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the upper guide rail structure; Figure 3 This is a schematic diagram of the upper guide rail; Figure 4 This is a schematic diagram of the second guide seat. Figure 5 This is a schematic diagram of the grease nozzle. Figure 6 This is a schematic diagram of the upper mold plate structure; Figure 7 This is a schematic diagram of the bushing structure; Figure 8 This is a schematic diagram of the structure of the middle mold plate; Figure 9 This is a sectional view of the middle mold plate; Figure 10 This is a schematic diagram of the lower mold plate.

[0020] Explanation of reference numerals in the attached drawings: 1-Base, 2-Lower guide rail, 3-Lower die plate, 4-Middle die plate, 5-Upper guide rail, 6-Pressure plate, 7-Upper die plate, 8-Upper pressing punch, 9-Oil reservoir, 10-Lower pressing punch, 11-First guide seat, 12-Second guide seat, 13-Third guide seat, 14-Top cover, 15-Slot, 16-Thrust bearing, 17-Base, 18-Side cover, 19-Oil reservoir, 20-Oil nozzle, 21-Steel ball, 22-Spherical cavity, 23-Guide cavity, 24-Threaded hole, 25-Pass 26-Spring, 27-Guide post, 28-First cylindrical cavity, 29-Oil sealing plate, 30-First through hole, 31-Sealing gasket, 32-Shaft sleeve, 33-Second through hole, 34-Side flange, 35-Cavity, 36-Lubricating block, 37-Pressure mold, 38-Second cylindrical cavity, 39-Limiting ring groove, 40-Locking bolt, 41-First countersunk hole, 42-Second countersunk hole, 43-Mold release bolt, 44-Third through hole, 45-Pressure plate, 46-Third cylindrical cavity, 47-Fourth through hole, 48-Fifth through hole. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The accompanying drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner.

[0022] like Figure 1 As shown, the present invention adopts a vertical coaxial assembly structure, including a base 1, a lower die plate 3, a middle die plate 4, an upper die plate 7, and a pressure plate 6, which are sequentially stacked from bottom to top. Multiple upper pressing punches 8 are evenly assembled circumferentially along the outer edge of the upper die plate 7, and each upper pressing punch 8 can slide along the axial direction of the upper die plate 7. Multiple lower pressing punches 10 are evenly assembled circumferentially along the outer edge of the lower die plate 3, and each lower pressing punch 10 can slide along the axial direction of the lower die plate 3. The lower pressing punches 10 and the upper pressing punches 8 are arranged in a one-to-one correspondence, facing each other vertically. Two sets of symmetrically distributed upper guide rails 5 are fixedly installed on the pressure plate 6. The upper guide rails 5 are arc-shaped rails used to constrain and guide the lifting and lowering trajectory of the upper pressing punches 8. A lower guide rail 2 adapted to the guiding trajectory of the upper guide rails 5 is fixedly installed on the base 1. The lower guide rail 2 is annular rail used to constrain and guide the lifting and lowering trajectory of the lower pressing punches 10. The lower die plate 3, middle die plate 4, and upper die plate 7 are fixed together by bolts to form a rotating module that can rotate synchronously around the central spindle of the equipment. The pressure plate 6 and the base 1 remain stationary. The rotating module drives each pressing punch to rotate synchronously and move up and down along the corresponding guide rails, thereby realizing the continuous pressing operation between the upper pressing punch 8 and the lower pressing punch 10. The assembly and movement relationships between the above-mentioned components are all existing known technologies, which can be referred to in patent documents CN121368523A and CN121290820A. This application will not elaborate further on these aspects.

[0023] like Figure 2 and Figure 3 As shown, the upper end face of the pressure plate 6 has two symmetrically distributed slots 15, and the upper guide rail 5 is fixed to the corresponding slots 15 by bolts. The lower end face of the upper guide rail 5 is machined with a guide cavity 23 extending along a preset trajectory to constrain and guide the movement of the upper pressing punch 8.

[0024] like Figure 4 and Figure 5As shown, the upper guide rail 5 adopts an integrated design, with an oil reservoir 19 located in the center of its upper end face. A top cover 14 is fitted over the oil reservoir 19. Multiple vertically extending threaded holes 24 are formed at the bottom inner surface of the oil reservoir 19. Each threaded hole 24 has a spherical cavity 22 machined at its end, and the spherical cavity 22 communicates with the guide cavity 23 below. Multiple oiling nozzles 20 are installed at the bottom inner surface of the oil reservoir 19. Each oiling nozzle 20 includes a housing and a steel ball 21. The steel ball 21 is embedded in the corresponding spherical cavity 22 and can roll freely. The housing is screwed into the corresponding threaded hole 24. A guide post 27 is located at the center of the housing, and a spring 26 is fitted on the guide post 27. One end of the spring 26 abuts against the inside of the housing, and the other end abuts against the corresponding steel ball 21. Multiple circumferentially distributed oil passage holes 25 are formed on the side wall of the housing to introduce lubricating oil from the oil reservoir 19 into the housing.

[0025] By screwing the housing, the preload of the spring 26 on the steel ball 21 can be adjusted, thereby changing the contact pressure of the steel ball 21 on the upper pressing punch 8. Under normal conditions, the spring 26 presses the steel ball 21 tightly against the constriction of the spherical cavity 22 (the connection between the spherical cavity 22 and the guide cavity 23), achieving a seal. Part of the spherical body of the steel ball 21 leaks through the constriction of the spherical cavity 22 into the guide cavity 23. When the upper pressing punch 8 passes by the steel ball 21, it squeezes the steel ball 21, causing it to compress the spring 26 and move inward. At this time, a gap is formed between the steel ball 21 and the spherical cavity 22. The lubricating oil in the oil reservoir 19 seeps out from this gap and coats the top of the upper pressing punch 8, then flows downward along the surface of the upper pressing punch 8, achieving lubrication of the upper pressing punch 8 and reducing wear between the upper pressing punch 8 and surrounding components.

[0026] like Figure 2 and Figure 3 As shown, the upper guide rail 5 can also adopt a split design, including a first guide seat 11, a second guide seat 12, and a third guide seat 13 connected in sequence. All three guide seats are fastened to the slot 15 by bolts, and the chambers on each guide seat are connected in sequence to form a guide cavity 23 for constraining and guiding the lifting and lowering movement of the upper pressing punch 8. If a split design is adopted, the oil storage cavity 19 and the oiling nozzle 20 are only located on the second guide seat 12. This is because the trajectory segment corresponding to the second guide seat 12 is a smooth segment, which facilitates stable oil supply from the oiling nozzle 20 and is less likely to interfere with the lifting and lowering movement of the upper pressing punch 8.

[0027] In addition, the three guide seats mentioned above can also adopt another split structure: including a side cover 18 and a seat body 17 fixed to the slot 15. The side cover 18 is fastened to the seat body 17 by bolts. The outer wall of the seat body 17 is machined with a first side groove extending along a preset trajectory, and the inner wall of the side cover 18 is machined with a second side groove extending along a preset trajectory. The second side groove and the first side groove together form a cavity. The cavities on each guide seat are then connected sequentially to form a guide cavity 23 for constraining and guiding the lifting and lowering movement of the upper pressing punch 8.

[0028] When the upper guide rail 5 adopts an integrated design, the guide cavity 23 has no splicing seams throughout, the trajectory transition is relatively smooth, and the assembly error is low. However, the processing difficulty is high, and if local wear is severe, the entire piece needs to be replaced, resulting in high maintenance costs. When a split design is adopted, the relatively complex trajectory can be decomposed into multiple simple arcs or straight lines. The processing difficulty is low, but the assembly accuracy requirements are high. It is necessary to ensure that there are no steps or misalignments at the joints of each segment to avoid affecting the smoothness of the movement of the upper pressing punch 8.

[0029] like Figure 2 As shown, the upper end face of the upper mold plate 7 is fitted with multiple coaxially arranged thrust bearings 16, such as flat needle roller bearings or thrust ball bearings. The lower end face of the upper guide rail 5 contacts the upper end face of the thrust bearings 16 to withstand the axial pressure applied by the upper guide rail 5, while allowing the upper mold plate 7 to rotate flexibly relative to the upper guide rail 5, thereby reducing rotational friction and wear.

[0030] like Figure 6 As shown, the lower end face of the upper die plate 7 has multiple axially extending first cylindrical cavities 28, each first cylindrical cavity 28 being coaxially arranged with a corresponding upper pressing punch 8. The upper end face of the upper die plate 7 has multiple second through holes 33 communicating with the corresponding first cylindrical cavities 28, allowing the upper pressing punch 8 to pass through. Each first cylindrical cavity 28 has a bushing 32 embedded inside, through which the upper pressing punch 8 passes, guiding the pressing punch's sliding and providing radial support. The lower end face of the upper die plate 7 is fixed with an annular oil sealing plate 29 by screws. The oil sealing plate 29 has multiple first through holes 30 coaxially arranged with the corresponding first cylindrical cavities 28, allowing the upper pressing punch 8 to pass through. The oil sealing plate 29 supports the bushing 32, restricting its downward position, and the step formed at the junction of the second through hole 33 and the first cylindrical cavity 28 restricts the upward position of the bushing 32, achieving axial positioning of the bushing 32.

[0031] The upper end face of the upper die plate 7 has a convex retaining edge 34 around its outer edge. The inner diameter of the second through hole 33 is larger than the outer diameter of the main body of the upper pressing punch 8, with a difference of 0.5 mm. The inner diameter of the first cylindrical cavity 28 matches the outer diameter of the bushing 32, ensuring that the bushing 32 can be securely fitted inside the first cylindrical cavity 28. The inner diameter of the bushing 32 matches the outer diameter of the upper pressing punch 8, ensuring that the upper pressing punch 8 can slide flexibly inside the bushing 32. The inner diameter of the first through hole 30 is consistent with the inner diameter of the bushing 32, ensuring that the upper pressing punch 8 can pass through the first through hole 30 without obstruction. The upper end face of the oil sealing plate 29 has multiple annular grooves coaxially arranged with the first through hole 30. Each annular groove is evenly distributed with a sealing gasket 31, which is sandwiched between the oil sealing plate 29 and the corresponding bushing 32. The upper pressing punch 8 passes through the second through hole 33, the bushing 32, the sealing gasket 31 and the first through hole 30 in sequence from top to bottom along the axial direction, thereby achieving sliding assembly with the upper mold plate 7.

[0032] When the upper pressing punch 8 is lubricated, the lubricating oil flows downwards along its surface. Excess lubricating oil falls onto the upper end face of the upper die plate 7 and is stopped by the retaining edge 34 to prevent overflow. At the same time, some lubricating oil seeps into the first cylindrical cavity 28 through the gap between the upper pressing punch 8 and the second through hole 33 to lubricate the bushing 32. The sealing gasket 31 located below effectively prevents lubricating oil from leaking from below, avoiding contamination of the molding material.

[0033] like Figure 10 As shown, the upper end face of the lower die plate 3 has multiple third cylindrical cavities 46 extending axially therein, and the lower end face of the lower die plate 3 has a fourth through hole 47 coaxially arranged with the corresponding third cylindrical cavity 46. Each third cylindrical cavity 46 also has a bushing 32 embedded inside, through which the lower pressing punch 10 passes, guiding the pressing punch's sliding and providing radial support. An annular pressing template 45 is fixed to the upper end face of the lower die plate 3 by screws. The pressing template 45 has a fifth through hole 48 coaxially arranged with the corresponding third cylindrical cavity 46, allowing the lower pressing punch 10 to pass through. The pressing template 45 presses against the bushing 32, restricting its upward movement. The step formed at the junction of the third cylindrical cavity 46 and the fourth through hole 47 restricts the downward movement of the bushing 32, thus achieving axial positioning of the bushing 32. The lower pressing punch 10 passes axially from bottom to top through the fourth through hole 47, the bushing 32, and the fifth through hole 48, thereby achieving sliding assembly with the lower die plate 3.

[0034] The inner diameter of the third cylindrical cavity 46 is matched with the outer diameter of the bushing 32, ensuring that the bushing 32 can be securely fitted inside the third cylindrical cavity 46. The inner diameter of the bushing 32 is matched with the outer diameter of the lower pressing punch 10, ensuring that the lower pressing punch 10 can slide flexibly within the bushing 32. The inner diameter of the fourth through hole 47 is consistent with the inner diameter of the fifth through hole 48. The inner diameter of the fifth through hole 48 is larger than the outer diameter of the main body of the lower pressing punch 10, and the difference between the two is 0.5 mm, thereby ensuring that the lubricating oil can flow smoothly from top to bottom to the contact area between the lower pressing punch 10 and the lower guide rail 2.

[0035] like Figure 10 As shown, an oil reservoir 9 is mounted on the base 1 via a bracket, and the oil reservoir 9 is located between the lower mold plate 3 and the middle mold plate 4. Multiple oiling nozzles 20 are also mounted on the inner wall of the oil reservoir 9, and their outer ends elastically abut against the lower pressing punch 10 passing through the oil reservoir 9. The installation method and working principle of the oiling nozzles 20 in the oil reservoir 9 are the same as those in the oil reservoir cavity 19, and will not be described further in this application.

[0036] Figure 7 This is a schematic diagram of the bushing 32 used in the lower die plate 3 and the upper die plate 7. The bushing 32 has multiple cavities 35 evenly distributed circumferentially along its cylindrical body, penetrating both the inner and outer cylindrical surfaces. Each cavity 35 is filled with a lubricating block 36, and the inner and outer surfaces of the lubricating block 36 are flush with the inner and outer cylindrical surfaces of the bushing 32, ensuring the overall cylindricity of the bushing 32 and preventing interference or jamming of the pressing punch due to protruding structures. The lubricating block 36 acts as a solid lubricant and can be made of graphite, polytetrafluoroethylene, or molybdenum disulfide. The circumferentially distributed lubricating blocks 36 achieve uniform lubrication throughout the entire area. Combined with the dynamic grease lubrication system of the grease nozzle 20, this forms a dual lubrication structure of long-lasting solid lubrication and dynamic liquid oil replenishment, significantly reducing the operating noise and motion resistance of the pressing punch, reducing friction and wear, and effectively extending the service life of the bushing 32 and the pressing punch.

[0037] like Figure 8 and Figure 9 As shown, the upper end face of the middle die plate 4 has a second cylindrical cavity 38 corresponding to the upper pressing punch 8, and the lower end face of the middle die plate 4 has a third through hole 44 coaxially arranged with the corresponding second cylindrical cavity 38 for the lower pressing punch 10 to pass through. Each second cylindrical cavity 38 has a pressing die 37 embedded inside, and the upper end face of the pressing die 37 is flush with the upper end face of the middle die plate 4. The outer wall of the pressing die 37 has an annular limiting groove 39, and the outer wall of the middle die plate 4 has a first countersunk hole 41 communicating with the corresponding second cylindrical cavity 38. The locking bolt 40 is screwed into the first countersunk hole 41 and extends into the limiting groove 39 to prevent the pressing die 37 from axially shifting.

[0038] The bottom of the pressing mold 37 is conical. The outer wall of the middle mold plate 4 has a second countersunk hole 42 that connects to the corresponding second cylindrical cavity 38. The demolding bolt 43 is screwed into the second countersunk hole 42 and faces the conical bottom of the pressing mold 37. The end of the demolding bolt 43 near the pressing mold 37 is also machined into a conical shape. By tightening the demolding bolt 43, the axial thrust generated by the conical surface can push the pressing mold 37 out of the second cylindrical cavity 38, achieving rapid demolding.

[0039] After the equipment is started, the external drive device drives the lower die plate 3, the middle die plate 4, and the upper die plate 7 to rotate synchronously. The lower pressing punch 10 of the lower die plate 3 slides along the trajectory of the lower guide rail 2, gradually rises in the rising section, and enters the lower end of the die hole of the pressing die 37. The upper pressing punch 8 of the upper die plate 7 slides along the trajectory of the upper guide rail 5, gradually descends in the falling section, and enters the upper end of the die hole of the pressing die 37, compacting the powder in the die hole into sheets. When lubrication is required, lubricating oil is added to the oil reservoir 9 and the guide cavity 23. The preload of the steel ball 21 is adjusted by turning the housing adjustment spring 26 of the grease nozzle 20, changing the contact pressure of the steel ball 21 on the upper pressing punch 8 or the lower pressing punch 10. During the rotation of the upper die plate 7, the top of the upper pressing punch 8 periodically presses the steel ball 21 below the oil storage cavity 19, releasing a small amount of lubricating oil upon each contact. The lubricating oil is directly coated on the top of the upper pressing punch 8, and then gradually coated on the inner wall of the corresponding bushing 32 as the upper pressing punch 8 moves. During the rotation of the lower die plate 3, the side wall of the lower pressing punch 10 periodically presses the steel ball 21 on the outside of the oil storage box 9, releasing a small amount of lubricating oil upon each contact. The lubricating oil is directly coated on the outer wall of the lower pressing punch 10, and then gradually coated on the inner wall of the corresponding bushing 32 and the contact area between the lower pressing punch 10 and the lower guide rail 2 as the lower pressing punch 10 moves.

Claims

1. A potassium superoxide hot pressing molding die, comprising a base (1), a lower mold plate (3), a middle mold plate (4), an upper mold plate (7), and a pressure plate (6) arranged sequentially from bottom to top, wherein the upper mold plate (7) has a plurality of upper pressing punches (8) distributed circumferentially on its outer edge, the pressure plate (6) has an upper guide rail (5) on its top for guiding the movement of each upper pressing punch (8), the lower mold plate (3) has a plurality of lower pressing punches (10) corresponding one-to-one with the upper pressing punches (8) on its outer edge, and the base (1) has a lower guide rail (2) on its top for guiding the movement of the lower pressing punches (10), characterized in that: The base (1) is equipped with an oil storage box (9) by a bracket. The oil storage box (9) is located between the lower mold plate (3) and the middle mold plate (4). The lower end face of the upper guide rail (5) is provided with a guide cavity (23) adapted to the direction of the upper pressing punch (8). The upper end face of the upper guide rail (5) is provided with an oil storage cavity (19). Multiple oiling nozzles (20) are installed on the bottom wall of the oil storage cavity (19) and the side wall of the oil storage box (9). Each oiling nozzle (20) is connected to the inner cavity of the corresponding oil storage cavity (19) or oil storage box (9). The outer end of the oiling nozzle (20) at the oil storage cavity (19) is elastically abutted against the upper pressing punch (8) passing through the guide cavity (23). The outer end of the oiling nozzle (20) at the oil storage box (9) is elastically abutted against the lower pressing punch (10) passing through the oil storage box (9).

2. The potassium superoxide hot pressing mold according to claim 1, characterized in that: The oiling nozzle (20) includes a housing and a steel ball (21). The outer wall of the housing is provided with multiple oil passage holes (25) that connect to its own inner cavity. The bottom of the oil storage cavity (19) and the inner side wall of the oil storage box (9) are provided with multiple threaded holes (24). The end of each threaded hole (24) is provided with a spherical cavity (22). The spherical cavity (22) connects to the guide cavity (23) or the outer wall of the oil storage box (9). The steel ball (21) is embedded in the corresponding spherical cavity (22). The housing is installed in the corresponding threaded hole (24). The center of the housing is provided with a guide post (27). The guide post (27) is fitted with a spring (26). The spring (26) pushes the steel ball (21). The steel ball (21) abuts against the corresponding upper pressing punch (8) or lower pressing punch (10).

3. The potassium superoxide hot pressing mold according to claim 1, characterized in that: The upper end face of the middle mold plate (4) is provided with a plurality of second cylindrical cavities (38) corresponding one-to-one with the upper pressing punch (8). The lower end face of the middle mold plate (4) is provided with a third through hole (44) connecting the corresponding second cylindrical cavity (38). Each second cylindrical cavity (38) is fitted with a pressing mold (37).

4. The potassium superoxide hot pressing mold according to claim 3, characterized in that: The outer wall of the pressing mold (37) is provided with a limiting ring groove (39), and the outer wall of the middle mold plate (4) is provided with a plurality of first countersunk holes (41) that connect to the corresponding second cylindrical cavity (38). The first countersunk hole (41) is fitted with a locking bolt (40) that is adapted to the limiting ring groove (39).

5. The potassium superoxide hot pressing mold according to claim 3, characterized in that: The bottom of the pressing mold (37) is conical, and the outer wall of the middle mold plate (4) is provided with a plurality of second countersunk holes (42) that connect to the corresponding second cylindrical cavity (38). The second countersunk hole (42) is fitted with a demolding bolt (43) that is adapted to the conical bottom of the pressing mold (37).

6. The potassium superoxide hot pressing mold according to claim 1, characterized in that: The lower end face of the upper die plate (7) is provided with a plurality of first cylindrical cavities (28) coaxially arranged with the corresponding upper pressing punch (8). The upper end face of the upper die plate (7) is provided with a plurality of second through holes (33) connecting the corresponding first cylindrical cavities (28). The upper end face of the lower die plate (3) is provided with a plurality of third cylindrical cavities (46) coaxially arranged with the corresponding lower pressing punch (10). The lower end face of the lower die plate (3) is provided with a plurality of fourth through holes (47) connecting the corresponding third cylindrical cavities (46). The first cylindrical cavity (28) and the third cylindrical cavity (46) are each fitted with a bushing (32). The bushing (32) is fitted on the outside of the upper pressing punch (8) and the lower pressing punch (10).

7. The potassium superoxide hot pressing mold according to claim 6, characterized in that: The bushing (32) has multiple cavities (35) circumferentially opened on the shaft body, and each cavity (35) is filled with a lubricating block (36).

8. The potassium superoxide hot pressing mold according to claim 6, characterized in that: The lower end face of the upper mold plate (7) is fixed with an oil sealing plate (29) that supports the corresponding bushing (32), and the upper end face of the lower mold plate (3) is fixed with a pressing plate (45) that presses the corresponding bushing (32).

9. The potassium superoxide hot pressing mold according to claim 8, characterized in that: The first cylindrical cavity (28) is fitted with a sealing gasket (31), which is sleeved on the outside of the upper pressing punch (8) and sandwiched between the oil sealing plate (29) and the corresponding bushing (32).

10. The potassium superoxide hot pressing mold according to claim 1, characterized in that: The upper end face of the upper mold plate (7) is fitted with a thrust bearing (16), and the upper guide rail (5) is attached to the thrust bearing (16).

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