Apparatus and preparation method of standard sample of platinum catalyst for ammonia oxidation to produce nitric acid

Abstract

The application belongs to the technical field of standard sample preparation, in particular to a device and a preparation method for a platinum catalyst standard sample for ammonia oxidation to prepare nitric acid, which comprises two symmetrically arranged side plates, first through grooves are formed in the two side plates, sliding plates are slidably connected in the first through grooves, second transmission shafts are rotatably connected to the two sliding plates, upper rollers are fixedly connected to the second transmission shafts, a first transmission shaft is rotatably connected between the two side plates, a lower roller is fixedly connected to the first transmission shaft, and the sliding plates move up and down through adjusting pieces. The device solves the problems that the existing tabletting device is complicated to operate and has safety hazards when rolling the sample ingot, the staff needs to manually feed the sample ingot into the pressure roller and receive it, the process is repeated for secondary rolling until the required thickness is reached, and the efficiency is low. Moreover, the staff's hand is close to the pressure roller at the end of the sample ingot rolling, and pressure injury accidents are likely to occur.

Description

Technical Field

[0001] This invention belongs to the field of standard sample preparation technology, specifically an apparatus and method for preparing a standard sample of platinum catalyst for the ammonia oxidation to nitric acid. Background Technology

[0002] Platinum catalysts are catalysts made with platinum as the main active component. They are mainly used in processes such as ammonia oxidation, petroleum hydrocarbon reforming, oxidation and hydrogenation of unsaturated compounds, and removal of carbon monoxide and nitrogen oxides from gases. They are a commonly used catalyst in chemical, petroleum and chemical reaction processes.

[0003] In the existing technology, during the preparation of standard samples of platinum catalysts for the oxidation of ammonia to nitric acid, a mirror pressing mechanism is needed to roll the smelted platinum alloy ingots to a standard thickness so that they can be cut into standard sample pieces. When rolling the ingots, the existing pressing device requires the operator to hold the ingot and feed it between two pressure rollers for a first rolling until the end of the ingot is fully inserted. At the same time, the operator needs to receive the ingot after the first rolling and then adjust the rolling depth. The above operation is repeated for a second rolling until the required thickness is achieved. However, this method is not only inefficient, but also prone to safety accidents because the operator's hand is close to the pressure rollers at the end of the ingot rolling.

[0004] Therefore, the present invention provides an apparatus and a method for preparing a standard sample of a platinum catalyst for the ammonia oxidation to nitric acid. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and address the problems of cumbersome operation and safety hazards in the rolling of sample ingots using existing tableting devices, where workers need to hand-feed the sample ingots into the pressure rollers for rolling and receiving, and repeat this process for secondary rolling until the required thickness is achieved, this invention proposes an apparatus and preparation method for a standard sample of a platinum catalyst used in the ammonia oxidation to nitric acid production.

[0006] The technical solution adopted by this invention to solve its technical problem is: a device for preparing a standard sample of platinum catalyst for the oxidation of ammonia to nitric acid, comprising a mirror pressing mechanism, the mirror pressing mechanism comprising two symmetrically arranged side plates, each side plate having a first through groove, a sliding plate slidably connected in the first through groove, a second drive shaft rotatably connected between the two sliding plates, an upper roller fixedly connected to the second drive shaft, a first drive shaft rotatably connected between the two side plates, a lower roller fixedly connected to the first drive shaft, the sliding plates moving up and down via an adjusting member, the first drive shaft and the second drive shaft being connected by a first transmission member. A pair of lower rotating rollers are rotatably connected between the side plates. The two lower rotating rollers are symmetrically distributed about the lower roller. A pair of symmetrically distributed first L-shaped plates are fixed to the opposite side walls of the two slide plates. An upper rotating roller is rotatably connected to the first L-shaped plate on the adjacent slide plates. The upper rotating roller is located directly above the lower rotating roller. The first drive shaft is driven by two sets of sprockets and chains and a pair of lower rotating rollers respectively. A set of third drive rollers is rotatably connected to the two side plates. A set of rubber blocks is fixed to the third drive roller, the upper rotating roller and the lower rotating roller. Pulleys are fixed to the third drive roller and the lower rotating roller. The pulleys are driven by a conveyor belt.

[0007] Preferably, the first transmission component includes a support plate, on which a first servo motor is fixedly mounted. The output end of the first servo motor is connected to a first transmission shaft. A first rotating shaft is rotatably connected to the support plate. Both the first rotating shaft and the first transmission shaft are fixedly mounted with first gears, which mesh with each other. A universal drive shaft is provided between the first rotating shaft and the second transmission shaft. The universal drive shaft has telescopic properties.

[0008] Preferably, the adjusting component includes a second servo motor, a positioning plate fixed between the two side plates, a second servo motor fixed to the top of the positioning plate, a first sprocket mounted on the output end of the second servo motor, lead screws rotatably connected in both first through slots, the tops of both lead screws extending out of the side plates, a second sprocket fixed to the top of one of the lead screws, the first sprocket and the second sprocket being connected by chain drive, synchronous pulleys fixed to both lead screws, the two synchronous pulleys being connected by chain drive, and a slide plate connected to the lead screws via a lead screw nut pair.

[0009] Preferably, a first cavity is provided inside the third transmission roller, and a set of second through grooves is provided on the outer wall of the third transmission roller. The second through grooves and the first cavity are interconnected. Two first sliders are provided inside the first cavity, and a set of correction plates is provided on the outer wall of the first sliders. The correction plates extend out of the second through grooves, and the two first sliders move relative to each other or in opposite directions through a power component.

[0010] Preferably, the power component includes a third servo motor, a pair of symmetrically distributed fixed plates are fixed between the two side plates, the bottom end of the fixed plates is fixed to the third servo motor via a connecting column, the output end of the third servo motor is equipped with a second gear, the bottom end of the fixed plates is slidably connected to a pair of first racks symmetrically distributed about the center of the second gear, the end of the first rack passes through the side plate and is fixed to a push plate, a set of push rods is fixed to the push plate, one end of the push rod passes through the side plate and extends into the first cavity, the end of the push rod is connected to the first slider, and the first rack and the second gear mesh with each other.

[0011] Preferably, the first slider includes a circular block and an annular plate. The circular block is fixedly connected to the end of the push rod, and the annular plate is rotatably connected to the outer wall of the circular block. A set of third through grooves is opened on the outer wall of the annular plate. The correction plate is slidably connected to the inner wall of the third through groove. An annular track groove is opened on the outer wall of the circular block. A sliding rod is fixedly connected to the bottom end of the correction plate. The sliding rod is slidably connected in the annular track groove. The annular track groove is composed of an arc-shaped groove and an arc-shaped isosceles trapezoidal groove.

[0012] Preferably, a set of first grooves are provided on the fixed plate, the first grooves and the third transmission roller are distributed alternately, a baffle is fixed to the bottom of the first groove by a spring, the baffle is slidably connected to the inner wall of the first groove, a pressure sensor is provided in the side wall of the baffle, and the baffle is moved upward by a pusher.

[0013] Preferably, the actuating element includes an electromagnetic block, the bottom end of the baffle is magnetic, and the electromagnetic block is fixed to the bottom of the first groove. When the electromagnetic block is energized, the electromagnetic block and the baffle repel each other.

[0014] Preferably, a fixing block is provided on one side of both the upper and lower rollers. Both ends of the upper and lower fixing blocks are fixed to the side wall of the slide plate and the side wall of the side plate respectively through the second L-shaped block. One side of the fixing block is set as an arc surface structure. A circular cavity is opened in both fixing blocks. One side of the circular cavity is set as an open structure. A spiral scraper roller is rotatably connected between the two side walls of the two circular cavities. One side of the surface of the two spiral scraper rollers extends out of the circular cavity opening and fits against the surface of the upper and lower rollers. The two spiral scraper rollers are connected to the first drive shaft and the second drive shaft respectively through sprockets and chains. A collection cavity is opened in the fixing block and communicates with the circular cavity.

[0015] A method for preparing a standard sample of a platinum catalyst for the ammonia oxidation to nitric acid, the method employing the aforementioned apparatus for preparing a standard sample of a platinum catalyst for the ammonia oxidation to nitric acid, and the method comprising the following steps:

[0016] S1: Metal powder is placed into a mold according to a specific ratio and prefabricated blocks are made by vacuum sintering.

[0017] S2: Place the precast block into the molten pool of the crystallizer in a non-consumable arc melting furnace, and remelt the precast block multiple times to obtain a platinum alloy ingot with a smooth and relatively regular surface.

[0018] S3: The platinum alloy sample ingot is rolled to the required thickness using a mirror pressing mechanism;

[0019] S4: Use a laser cutting machine to cut the rolled sample into standard-sized platinum alloy samples.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This invention uses a first transmission component to drive a first transmission shaft and a second transmission shaft to rotate. Simultaneously, a pulley and a conveyor belt drive a set of third transmission rollers to rotate, allowing the sample ingot to be conveyed on the third transmission rollers. The upper and lower rollers initially roll the sample ingot. After the initial rolling, the sample ingot passes through the upper and lower rollers, and the first transmission component rotates in the opposite direction, driving the initially rolled sample ingot to be driven in the opposite direction by the third transmission rollers. It then passes through the distance between the upper and lower rollers, which has been adjusted by the adjusting component, and rolls again. This process is repeated until the desired thickness of the sample ingot is achieved. This avoids insufficient rolling processing due to a single rolling operation and ensures the rolling quality of the sample ingot. At the same time, it eliminates the need for manual pushing, enabling direct automated operation and improving the rolling safety of the sample ingot. Furthermore, the upper and lower rollers are located on adjacent sides of the pressing position, facilitating the back-and-forth movement of the sample ingot.

[0022] 2. This invention uses an automated method to push the sample ingot back and forth. In order to avoid deviation during feeding or discharging, a correction plate is provided. When the sample ingot is being fed or discharged, the correction plate will push the sample ingot to correct its deviation. At the same time, a miniature pressure sensor is provided on the correction plate to prevent excessive compression from damaging the sample ingot. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the structure between the two side plates in this invention. Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the structure between the two side plates in this invention. Figure 2 ;

[0028] Figure 5 This is a schematic diagram of the structure of the upper and lower rolls in this invention;

[0029] Figure 6 This is a schematic diagram of the structure of the third transmission roller in this invention;

[0030] Figure 7 This is a schematic diagram of the structure of the fixing plate in this invention;

[0031] Figure 8 This is a schematic diagram of the structure of the third transmission roller in this invention;

[0032] Figure 9 This is an exploded view of the structure of the first slider in this invention;

[0033] Figure 10 This is a cross-sectional view of the fixing plate in this invention;

[0034] Figure 11 yes Figure 10 Enlarged view of point A in the middle;

[0035] Figure 12 This is an unfolded diagram of the annular track groove in the invention.

[0036] In the diagram: 11. Side plate; 12. First through slot; 13. Slide plate; 14. Second drive shaft; 15. Upper roller; 16. First drive shaft; 17. Lower roller; 2. Upper rotating roller; 21. First L-shaped plate; 22. Lower rotating roller; 23. Third drive roller; 24. Rubber block; 25. Pulley; 26. Conveyor belt; 3. Support plate; 31. First servo motor; 32. First gear; 33. Universal drive shaft; 34. First rotating shaft; 4. Second servo motor; 41. First sprocket; 42. Second sprocket; 43. Synchronous pulley; 44. Lead screw; 5. First cavity; 51. Second through groove; 52. First slider; 53. Correction plate; 54. Fixing plate; 55. First rack; 56. Push rod; 57. Push plate; 58. Second gear; 59. Third servo motor; 6. Circular block; 61. Annular plate; 62. Third through groove; 63. Annular track groove; 64. Arc groove; 65. Arc-shaped isosceles trapezoidal groove; 66. Sliding rod; 7. First groove; 71. Baffle; 72. Electromagnetic block; 8. Fixing block; 81. Second L-shaped block; 82. Circular cavity; 83. Spiral scraper roller; 84. Collection cavity. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 12As shown, the apparatus for preparing a standard sample of platinum catalyst for ammonia oxidation to nitric acid according to the present invention includes a mirror pressing mechanism. The mirror pressing mechanism includes two symmetrically arranged side plates 11, each with a first through groove 12. A slide plate 13 is slidably connected within the first through groove 12. A second drive shaft 14 is rotatably connected to the two slide plates 13, and an upper roller 15 is fixedly connected to the second drive shaft 14. A first drive shaft 16 is rotatably connected between the two side plates 11, and a lower roller 17 is fixedly connected to the first drive shaft 16. The slide plates 13 move up and down via an adjusting member, and the first drive shaft 16... The second drive shaft 14 is connected to the first drive component. A pair of lower rollers 22 are rotatably connected between the two side plates 11. The two lower rollers 22 are symmetrically distributed about the lower roller 17. A pair of symmetrically distributed first L-shaped plates 21 are fixed to the opposite side walls of the two slide plates 13. An upper roller 2 is rotatably connected to the first L-shaped plates 21 on the adjacent slide plates 13. The upper roller 2 is located directly above the lower roller 22. The first drive shaft 16 is connected to the pair of lower rollers 22 via two sets of sprockets and chains. A set of third drive rollers 23 are rotatably connected to the two side plates 11. 23. A set of rubber blocks 24 are fixedly attached to both the upper roller 2 and the lower roller 22. A pulley 25 is fixedly attached to both the third drive roller 23 and the lower roller 22. The two pulleys 25 are connected by a conveyor belt 26. When a sample ingot needs to be rolled, the first drive shaft 16 and the second drive shaft 14 are driven to rotate by the first drive component. At the same time, the third drive roller 23 is driven to rotate by the pulleys 25 and the conveyor belt 26, so that the sample ingot is conveyed on one of the sets of third drive rollers 23. The upper roller 15 and the lower roller 17 roll the sample ingot for the first time. After the initial rolling is completed, the sample ingot passes through the upper roller 15 and the lower roller 17. Then, the first transmission component rotates in the reverse direction, thereby driving the initially rolled sample ingot. The third transmission roller 23 drives the sample ingot to rotate in the reverse direction again. The distance between the upper roller 15 and the lower roller 17 is adjusted by the adjusting component, and rolling is performed again. This process is repeated until the required thickness of the sample ingot is achieved, avoiding insufficient rolling processing in one rolling and ensuring the rolling quality of the sample ingot. At the same time, no manual pushing is required, and the operation is directly automated, improving the rolling safety of the sample ingot. Meanwhile, the upper roller 2 and the lower roller 22 are located on adjacent sides of the pressing position, which facilitates the back-and-forth movement of the sample ingot.

[0039] The first transmission component includes a support plate 3, on which a first servo motor 31 is fixedly connected. The output end of the first servo motor 31 is connected to a first transmission shaft 16. A first rotating shaft 34 is rotatably connected to the support plate 3. A first gear 32 is fixedly connected to both the first rotating shaft 34 and the first transmission shaft 16. The two first gears 32 mesh with each other. A universal drive shaft 33 is provided between the first rotating shaft 34 and the second transmission shaft 16. The universal drive shaft 33 has telescopic properties. During operation, the slide plate 13 drives the upper roller 15 to move up and down, adjusting the distance between the upper roller 15 and the lower roller 17. Through the meshing of the two first gears 32, when the slide plate 13 moves up and down, the rotation of the first rotating shaft 34 can still drive the rotation of the second transmission shaft 14, without affecting the rotation of the upper roller 15.

[0040] The adjusting mechanism includes a second servo motor 4, a positioning plate fixed between the two side plates 11, a second servo motor 4 fixed to the top of the positioning plate, a first sprocket 41 installed at the output end of the second servo motor 4, and lead screws 44 rotatably connected in the two first through slots 12. The tops of the two lead screws 44 extend out of the side plates 11, and a second sprocket 42 is fixed to the top of one of the lead screws 44. The first sprocket 41 and the second sprocket 42 are connected by a chain drive. Synchronous pulleys 43 are fixed to the two lead screws 44 and are connected by a chain drive. The slide plate 13 is connected to the lead screw 44 through a lead screw nut pair. When the second servo motor 4 is working, the arrangement of the first sprocket 41, the second sprocket 42, the synchronous pulley 43 and the chain facilitates the rotation of the lead screw 44, adjusts the slide plate 13 up and down, and thus adjusts the distance between the upper roller 15 and the lower roller 17.

[0041] The third drive roller 23 has a first cavity 5 inside, and a set of second through grooves 51 are opened on the outer wall of the third drive roller 23. The second through grooves 51 and the first cavity 5 are connected to each other. Two first sliders 52 are provided in the first cavity 5. A set of correction plates 53 are provided on the outer wall of the first sliders 52. The correction plates 53 extend out of the second through grooves 51. The two first sliders 52 move relative to each other or in opposite directions through a power component. During operation, the sample ingot is pushed back and forth automatically. In order to avoid the deviation of feeding or discharging, correction plates 53 are set. When the sample ingot is fed or discharged, the correction plates 53 are pushed to correct the deviation of the sample ingot. At the same time, a miniature pressure sensor is provided on the correction plates 53 to avoid excessive compression that could damage the sample ingot.

[0042] The power components include a third servo motor 59, a pair of symmetrically distributed fixed plates 54 fixed between the two side plates 11, the third servo motor 59 fixed to the bottom of the fixed plates 54 via connecting columns, a second gear 58 mounted on the output end of the third servo motor 59, a pair of first racks 55 slidably connected to the bottom of the fixed plates 54 about the center of the second gears 58, the ends of the first racks 55 penetrating the side plates 11 and fixed to a push plate 57, a set of push rods 56 fixed to the push plate 57, one end of the push rods 56 penetrating the side plates 11 and extending into the first cavity 5, the end of the push rods 56 connected to the first slider 52, the first racks 55 and the second gears 58 meshing with each other; during correction, at this time, the rolling process should be completed, the third servo motor 59 works, using the meshing of the second gears 58 and the first racks 55 to drive the correction plate 53 to slide in the second through groove 51, facilitating the correction operation of the sample ingot (here the push rods 56 and the first slider 52 are rotatably connected).

[0043] The first slider 52 includes a circular block 6 and an annular plate 61. The circular block 6 is fixedly connected to the end of the push rod 56. The annular plate 61 is rotatably connected to the outer wall of the circular block 6. A set of third through grooves 62 is opened on the outer wall of the annular plate 61. The correction plate 53 is slidably connected to the inner wall of the third through grooves 62. An annular track groove 63 is opened on the outer wall of the circular block 6. A sliding rod 66 is fixedly connected to the bottom end of the correction plate 53. The sliding rod 66 is slidably connected in the annular track groove 63. The annular track groove 63 is composed of an arc-shaped groove 64 and an arc-shaped isosceles trapezoidal groove 65. During feeding, the correction plate 53 rotates with the third drive roller 23 and comes into contact with the sample ingot. To avoid damage to the side wall of the sample ingot when rotating and contacting it, an annular track groove 63 is provided. The correction plate 53 rotates with the third drive roller 23 and drives the annular plate 61 to rotate. Since the sliding rod 66 slides in the annular track groove 63, the correction plate 53 enters the arc-shaped isosceles trapezoidal groove 65 through the arc-shaped groove 64. This allows the correction plate 53 to move and contact the sample ingot, rather than rotating and directly contacting it, thus reducing damage to the side wall of the sample ingot.

[0044] A set of first grooves 7 are provided on the fixed plate 54. The first grooves 7 and the third transmission roller 23 are staggered. A baffle 71 is fixed to the bottom of the first groove 7 by a spring. The baffle 71 is slidably connected to the inner wall of the first groove 7. A pressure sensor is provided in the side wall of the baffle 71. The baffle 71 is moved upward by the pusher. When the sample ingot is rolled back and forth, the length of the sample ingot gradually increases. Therefore, the baffle 71 is provided. The pusher will drive the baffles 71 at different positions to move upward in sequence, which facilitates the positioning of the rolled sample ingot (avoiding the transmission distance through the third transmission roller 23 is too long).

[0045] The actuating component includes an electromagnetic block 72, and the bottom end of the baffle 71 is magnetic. The electromagnetic block 72 is fixedly connected to the bottom of the first groove 7. When the electromagnetic block 72 is energized, the electromagnetic block 72 and the baffle 71 repel each other. During operation, the electromagnetic block 72 is energized, and the electromagnetic block 72 and the baffle 71 repel each other. The baffle 71 moves upward to block the movement of the sample ingot (generally, the top of the baffle 71 is lower than the highest point of the third transmission roller 23), thereby positioning the rolled sample ingot and avoiding excessive transmission distance.

[0046] Both the upper roll 15 and the lower roll 17 have a fixing block 8 on one side. Both ends of the upper and lower fixing blocks 8 are fixed to the side wall of the slide plate 13 and the side wall of the side plate 11 respectively through the second L-shaped block 81. One side of the fixing block 8 is set as an arc surface structure. Both fixing blocks (8) have a circular cavity 82. One side of the circular cavity 82 is set as an open structure. The two side walls of the two circular cavities 82 are rotatably connected to a spiral scraper roller 83. One side of the surface of the two spiral scraper rollers 83 extends out of the opening of the circular cavity 82 and fits against the surface of the upper roll 15 and the lower roll 17. Each spiral scraper roller 83 is connected to the first drive shaft 16 and the second drive shaft 14 via a sprocket and chain. A collection chamber 84 is provided in the fixed block 8, which is connected to the circular cavity 82. When the upper roller 15 and the lower roller 17 rotate, the spiral scraper roller 83 is driven to rotate via the sprocket and chain, thereby cleaning the debris adhering to the surface of the upper roller 15 and the lower roller 17. The scraped debris is collected through the collection chamber 84 in the fixed block 8, so as to avoid the debris being pressed back onto the surface of the sample ingot, which would cause the surface of the sample ingot to be uneven.

[0047] Working principle:

[0048] When a sample ingot needs to be rolled, the first transmission component drives the first transmission shaft 16 and the second transmission shaft 14 to rotate. Simultaneously, the pulley 25 and the conveyor belt 26 cause a set of third transmission rollers 23 to rotate, allowing the sample ingot to be conveyed on the third transmission rollers 23. This causes the upper roller 15 and the lower roller 17 to initially roll the sample ingot. After the initial rolling, the sample ingot passes through the upper roller 15 and the lower roller 17, and then the first transmission component rotates in the opposite direction, further driving the initially rolled sample ingot. The third transmission rollers 23 then drive the sample ingot in the opposite direction. The distance between the upper roller 15 and the lower roller 17 is adjusted again by the adjusting component. The sample ingot can be rolled repeatedly until the desired thickness is achieved, avoiding insufficient rolling in a single pass and ensuring the rolling quality. It also eliminates the need for manual pushing, enabling automated operation and improving rolling safety. The upper and lower rollers 22 are positioned adjacent to the pressing position for easy movement of the sample ingot. Automated pushing of the sample ingot is employed, and a correction plate 53 is included to prevent deviations during feeding or discharging. Both feeding and discharging are performed by correcting the sample ingot's deviation using the correction plate 53. A miniature pressure sensor is installed on the alignment plate 53 to prevent excessive pressure from damaging the sample ingot. During feeding, the alignment plate 53 rotates with the third drive roller 23 and comes into contact with the sample ingot. To avoid damage to the sidewall of the sample ingot during rotational contact, an annular track groove 63 is provided. As the alignment plate 53 rotates with the third drive roller 23, it simultaneously drives the annular plate 61 to rotate. Because the sliding rod 66 slides within the annular track groove 63, the alignment plate 53 enters the arc-shaped isosceles trapezoidal groove 65 through the arc-shaped groove 64, allowing the alignment plate 53 to move and contact the sample ingot, rather than directly contacting it by rotation, thus reducing damage to the sidewall of the sample ingot. Damage to the wall; during the back-and-forth rolling of the sample ingot, the length of the sample ingot gradually increases, so a baffle 71 is provided, which will be driven to move the baffle 71 at different positions in sequence through the jacking member, so as to facilitate the positioning of the rolled sample ingot (to avoid the transmission distance through the third transmission roller 23 being too long); when the upper roller 15 and the lower roller 17 rotate, the spiral scraper roller 83 is driven to rotate through the sprocket chain, thereby cleaning the debris adhering to the surface of the upper roller 15 and the lower roller 17. The scraped debris is collected through the collection cavity 84 opened in the fixed block 8, so as to avoid the debris being pressed back onto the surface of the sample ingot, which would cause the surface of the sample ingot to be uneven.

[0049] A method for preparing a standard sample of a platinum catalyst for the ammonia oxidation to nitric acid, the method employing the aforementioned apparatus for preparing a standard sample of a platinum catalyst for the ammonia oxidation to nitric acid, and the method is as follows:

[0050] S1: Metal powder is placed into a mold according to a specific ratio and prefabricated blocks are made by vacuum sintering.

[0051] S2: Place the precast block into the molten pool of the crystallizer in a non-consumable arc melting furnace, and remelt the precast block multiple times to obtain a platinum alloy ingot with a smooth and relatively regular surface.

[0052] S3: The platinum alloy sample ingot is rolled to the required thickness using a mirror pressing mechanism;

[0053] S4: Use a laser cutting machine to cut the rolled sample into standard-sized platinum alloy samples.

[0054] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0055] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An apparatus for preparing a standard sample of a platinum catalyst for the ammonia oxidation to nitric acid, characterized in that, The system includes a mirror pressing mechanism, comprising two symmetrically arranged side plates (11). Each side plate (11) has a first through groove (12). A slide plate (13) is slidably connected within the first through groove (12). A second drive shaft (14) is rotatably connected between the two slide plates (13). An upper roller (15) is fixedly connected to the second drive shaft (14). A first drive shaft (16) is rotatably connected between the two side plates (11). A lower roller (17) is fixedly connected to the first drive shaft (16). The slide plates (13) move up and down via an adjusting member. The first drive shaft (16) and the second drive shaft (14) are connected via a first transmission member. A pair of lower rotating rollers (22) are rotatably connected between the two side plates (11). The two lower rotating rollers (22) are positioned relative to the lower... The rolls (17) are symmetrically distributed. A pair of symmetrically distributed first L-shaped plates (21) are fixed on the opposite side walls of the two slide plates (13). The first L-shaped plates (21) on the adjacent slide plates (13) are rotatably connected to the upper rollers (2). The upper rollers (2) are located directly above the lower rollers (22). The first drive shaft (16) is driven by two sets of sprockets and chains and a pair of lower rollers (22). A set of third drive rollers (23) is rotatably connected to the two side plates (11). A set of rubber blocks (24) are fixed on the third drive rollers (23), the upper rollers (2) and the lower rollers (22). Pulleys (25) are fixed on the third drive rollers (23) and the lower rollers (22). The pulleys (25) are driven by the conveyor belt (26). The first transmission component includes a support plate (3), on which a first servo motor (31) is fixedly connected. The output end of the first servo motor (31) is connected to a first transmission shaft (16). A first rotating shaft (34) is rotatably connected to the support plate (3). A first gear (32) is fixedly connected to both the first rotating shaft (34) and the first transmission shaft (16). The two first gears (32) mesh with each other. A universal transmission shaft (33) is provided between the first rotating shaft (34) and the second transmission shaft (14). The universal transmission shaft (33) has telescopic properties. The adjusting component includes a second servo motor (4), a positioning plate fixed between the two side plates (11), a second servo motor (4) fixed at the top of the positioning plate, a first sprocket (41) installed at the output end of the second servo motor (4), a lead screw (44) rotatably connected in the two first through slots (12), the tops of the two lead screws (44) extending out of the side plates (11), a second sprocket (42) fixed at the top of one of the lead screws (44), the first sprocket (41) and the second sprocket (42) being connected by chain drive, a synchronous pulley (43) fixed on the two lead screws (44), the two synchronous pulleys (43) being connected by chain drive, and a slide plate (13) connected to the lead screw (44) through a lead screw nut pair; The third transmission roller (23) has a first cavity (5) inside, and a set of second through grooves (51) is provided on the outer wall of the third transmission roller (23). The second through grooves (51) and the first cavity (5) are connected to each other. The first cavity (5) has two first sliders (52) inside, and a set of correction plates (53) is provided on the outer wall of the first sliders (52). The correction plates (53) extend out of the second through grooves (51). The two first sliders (52) move relative to each other or in opposite directions through the power component. The power components include a third servo motor (59), a pair of symmetrically distributed fixed plates (54) fixed between the two side plates (11), the bottom end of the fixed plate (54) is fixed to the third servo motor (59) through a connecting column, the output end of the third servo motor (59) is equipped with a second gear (58), the bottom end of the fixed plate (54) is slidably connected to a pair of first racks (55) symmetrically distributed about the center of the second gear (58), the end of the first rack (55) passes through the side plate (11) and is fixed to a push plate (57), a set of push rods (56) is fixed on the push plate (57), one end of the push rod (56) passes through the side plate (11) and extends into the first cavity (5), the end of the push rod (56) is connected to the first slider (52), and the first rack (55) and the second gear (58) mesh with each other.

2. The apparatus for preparing a standard sample of platinum catalyst for ammonia oxidation to nitric acid according to claim 1, characterized in that, The first slider (52) includes a circular block (6) and an annular plate (61). The circular block (6) is fixedly connected to the end of the push rod (56). The annular plate (61) is rotatably connected to the outer wall of the circular block (6). A set of third through grooves (62) is opened on the outer wall of the annular plate (61). The correction plate (53) is slidably connected to the inner wall of the third through groove (62). An annular track groove (63) is opened on the outer wall of the circular block (6). A sliding rod (66) is fixedly connected to the bottom end of the correction plate (53). The sliding rod (66) is slidably connected in the annular track groove (63). The annular track groove (63) is composed of an arc groove (64) and an arc isosceles trapezoidal groove (65).

3. The apparatus for preparing a standard sample of platinum catalyst for ammonia oxidation to nitric acid according to claim 2, characterized in that, A set of first grooves (7) are provided on the fixed plate (54). The first grooves (7) and the third transmission roller (23) are staggered. A baffle (71) is fixed to the bottom of the first groove (7) by a spring. The baffle (71) is slidably connected to the inner wall of the first groove (7). A pressure sensor is provided in the side wall of the baffle (71). The baffle (71) is moved upward by a pusher.

4. The apparatus for preparing a standard sample of platinum catalyst for ammonia oxidation to nitric acid according to claim 3, characterized in that, The actuating component includes an electromagnetic block (72), the bottom end of the baffle (71) is magnetic, and the bottom of the first groove (7) is fixed with the electromagnetic block (72). When the electromagnetic block (72) is energized, the electromagnetic block (72) and the baffle (71) repel each other.

5. The apparatus for preparing a standard sample of platinum catalyst for ammonia oxidation to nitric acid according to claim 4, characterized in that, A fixing block (8) is provided on one side of the upper roll (15) and the lower roll (17). The two ends of the upper and lower fixing blocks (8) are fixed to the side wall of the slide plate (13) and the side wall of the side plate (11) respectively through the second L-shaped block (81). One side of the fixing block (8) is set as an arc surface structure. A circular cavity (82) is opened in both fixing blocks (8). One side of the circular cavity (82) is set as an open structure. A spiral scraper roller (83) is rotatably connected between the two side walls of the two circular cavities (82). One side of the surface of the two spiral scraper rollers (83) extends out of the opening of the circular cavity (82) and fits against the surface of the upper roll (15) and the lower roll (17). The two spiral scraper rollers (83) are connected to the first drive shaft (16) and the second drive shaft (14) respectively through sprockets and chains. A collection cavity (84) is opened in the fixing block (8). The collection cavity (84) is connected to the circular cavity (82).

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