Device for preparing platinum catalyst standard sample for nitric acid through ammoxidation and preparation method

Abstract

The invention belongs to the technical field of standard sample preparation, and particularly relates to a device and a preparation method of a platinum catalyst standard sample for preparing nitric acid through ammoxidation, the device 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, and a second transmission shaft is rotatably connected to the two sliding plates; an upper roller is fixedly connected to the second transmission shaft, a first transmission shaft is rotationally connected between the two side plates, a lower roller is fixedly connected to the first transmission shaft, and the sliding plate moves up and down through an adjusting piece. The problems that when an existing tabletting device is used for rolling a sample ingot, the operation process is tedious, potential safety hazards exist, a worker needs to hold the sample ingot to be fed between compression rollers and received, the process is repeated for secondary rolling till the needed thickness is achieved, but the mode is low in efficiency, the hand of the worker is close to the compression rollers when the sample ingot is rolled at the tail end, and the labor intensity is high are solved. And crush injury accidents are easy to occur.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of standard sample preparation, and particularly relates to a device and a preparation method of a platinum catalyst standard sample for ammonia oxidation for preparing nitric acid. BACKGROUND

[0002] The platinum catalyst is a catalyst prepared by taking metal platinum as a main active component, and is mainly used in ammonia oxidation, petroleum hydrocarbon reforming, unsaturated compound oxidation and hydrogenation, removal of carbon monoxide and nitrogen oxides in gas and the like, and is a kind of catalyst frequently used in chemical, petroleum and chemical reaction processes.

[0003] In the prior art, in the preparation process of the platinum catalyst standard sample for ammonia oxidation for preparing nitric acid, a mirror surface tabletting mechanism is needed to roll the platinum alloy sample ingot melted into a standard thickness, so as to be cut into a standard sample piece. The existing tabletting device needs an operator to manually hold the sample ingot to send it into two rollers for one-time rolling until the end of the sample ingot completely enters, and meanwhile the worker needs to receive the sample ingot after one-time rolling, then adjusts the rolling depth, and repeats the above operation to perform two-time rolling until the required thickness is reached. However, this way is not only low in efficiency, but also the worker's hand is close to the roller at the end of the sample ingot rolling, and a safety accident is likely to occur.

[0004] Therefore, the application provides a device and a preparation method of a platinum catalyst standard sample for ammonia oxidation for preparing nitric acid. SUMMARY

[0005] In order to make up for the deficiencies of the prior art, solve the problems that the existing tabletting device is complicated in operation process and has safety hazards when rolling the sample ingot, the worker needs to manually hold the sample ingot to send it into the rollers, roll and receive, and repeat the process to perform two-time rolling until the required thickness is reached, but this way is not only low in efficiency, but also prone to crushing accidents, the application provides a device and a preparation method of a platinum catalyst standard sample for ammonia oxidation for preparing nitric acid.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a preparation device of a platinum catalyst standard sample for ammonia oxidation to produce nitric acid, comprising a mirror surface tabletting mechanism, the mirror surface tabletting mechanism comprises two symmetrically arranged side plates, first through grooves are formed in the side plates, sliding plates are slidably connected in the first through grooves, a second transmission shaft is rotatably connected between the two sliding plates, an upper roller is fixedly connected to the second transmission shaft, a first transmission shaft is rotatably connected between the two side plates, a lower roller is fixedly connected to the first transmission shaft, the sliding plates move up and down through an adjusting member, the first transmission shaft and the second transmission shaft are drivingly connected through a first transmission member, a pair of lower rollers are rotatably connected between the two side plates, the two lower rollers are symmetrically distributed about the lower roller, a pair of symmetrically distributed first L-shaped plates are fixedly connected to the opposite side walls of the two sliding plates, upper rollers are rotatably connected to the first L-shaped plates on the adjacent sliding plates, the upper rollers are located directly above the lower rollers, the first transmission shaft is drivingly connected to the two lower rollers through two groups of sprocket chains, a group of third transmission rollers are rotatably connected to the two side plates, a group of rubber blocks are fixedly connected to the third transmission rollers, the upper rollers and the lower rollers, a belt wheel is fixedly connected to the third transmission rollers and the lower rollers, and the belt wheels are drivingly connected through a conveyor belt.

[0007] Preferably, the first transmission member comprises a support plate, a first servo motor is fixedly connected to the support plate, an output end of the first servo motor is connected to the first transmission shaft, a first rotating shaft is rotatably connected to the support plate, first gears are fixedly connected to the first rotating shaft and the first transmission shaft, the two first gears are meshed with each other, a universal transmission shaft is arranged between the first rotating shaft and the second transmission shaft, and the universal transmission shaft has flexibility.

[0008] Preferably, the adjusting member comprises a second servo motor, a positioning plate is fixedly connected between the two side plates, a top end of the positioning plate is fixedly connected to the second servo motor, a first sprocket is mounted to an output end of the second servo motor, lead screws are rotatably connected in the two first through grooves, a top end of each lead screw extends out of the side plate, a second sprocket is fixedly connected to a top end of one of the lead screws, the first sprocket and the second sprocket are drivingly connected through a chain, synchronous wheels are fixedly connected to the two lead screws, the two synchronous wheels are drivingly connected through a chain, and the sliding plates are connected to the lead screws through lead screw nut pairs.

[0009] Preferably, a first cavity is formed in the third transmission roller, a group of second through grooves are formed in the outer side wall of the third transmission roller, the second through grooves and the first cavity are in communication, two first sliding blocks are arranged in the first cavity, a group of correction plates are arranged on the outer side walls of the first sliding blocks, the correction plates extend out of the second through grooves, and the two first sliding blocks move relatively or in opposite directions through a power member.

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

[0011] Preferably, the first slider comprises a circular block and an annular plate, the end of the push rod is fixedly connected with the circular block, the annular plate is rotatably connected to the outer side wall of the circular block, a group of third through grooves are formed in the outer side wall of the annular plate, the deviation correcting plate is slidably connected to the inner wall of the third through groove, an annular track groove is formed in the outer side wall of the circular block, the bottom end of the deviation correcting plate is fixedly connected with a sliding rod, and 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 group of first grooves are formed in the fixed plate, the first grooves and the third transmission rollers are staggered, the groove bottom of the first groove is fixedly connected with a baffle through a spring, the baffle is slidably connected to the inner wall of the first groove, the side wall of the baffle is provided with a pressure sensor, and the baffle moves upward through the jacking component.

[0013] Preferably, the jacking component comprises an electromagnetic block, the bottom end of the baffle has magnetism, the groove bottom of the first groove is fixedly connected with the electromagnetic block, and the electromagnetic block and the baffle repel each other when the electromagnetic block is electrified.

[0014] Preferably, the upper roller and the lower roller are provided with fixed blocks on one side, the two fixed blocks are fixedly connected with the side walls of the slide plates and the side walls of the side plates through the second L-shaped blocks at both ends, one side of the fixed block is provided as an arc surface structure, a circular cavity is formed in the two fixed blocks, one side of the circular cavity is provided as an opening structure, a spiral scraping roller is rotatably connected between the side walls of the two circular cavities, one side of the surface of the two spiral scraping rollers extends out of the opening of the circular cavity and is attached to the surface of the upper roller and the lower roller, the two spiral scraping rollers are connected with the first transmission shaft and the second transmission shaft through the chain wheels and the chains, a collecting cavity is formed in the fixed block, and the collecting cavity is communicated with the circular cavity.

[0015] A preparation method of a platinum catalyst standard sample for ammonia oxidation to produce nitric acid, the preparation method adopts the preparation device of a platinum catalyst standard sample for ammonia oxidation to produce nitric acid, and the preparation method comprises the following steps: S1: according to a specific ratio, metal powder is placed in a mold, and a preform block is prepared by vacuum sintering; S2: the preform block is placed in a non-consumable arc melting furnace crystallizer pool, the preform block is repeatedly remelted, and a platinum alloy sample ingot with a smooth and relatively regular surface is obtained; S3: a mirror surface tabletting mechanism is used to roll the platinum alloy sample ingot into a required thickness. S4: The rolled sample is cut into a standard size platinum alloy sample using a laser cutting machine.

[0016] The beneficial effects of the present application are as follows: 1. The first transmission member drives the first transmission shaft and the second transmission shaft to rotate, and at the same time, through the pulley and the conveyor belt, a group of third transmission rollers are driven to rotate, so that the sample ingot is conveyed on the group of third transmission rollers, and the upper roller and the lower roller initially roll the sample ingot. After the initial rolling is completed, the first transmission member is reversely rotated to drive the sample ingot after the initial rolling, the sample ingot is reversely driven by the third transmission roller, and the distance between the upper roller and the lower roller adjusted by the adjusting member is passed again, and the sample ingot is rolled again. Back and forth repeatedly until the required thickness of the sample ingot is reached, avoiding the situation that one-time rolling leads to insufficient rolling treatment, and also ensuring the rolling quality of the sample ingot, while directly automatic operation without manual pushing, improving the rolling safety of the sample ingot; meanwhile, the upper roller and the lower roller are located on the adjacent sides of the pressing position, thereby facilitating the back and forth movement of the sample ingot.

[0017] 2. The sample ingot is automatically pushed back and forth in the present application. In order to avoid the situation that the feeding or discharging deviates, a correction plate is arranged, and the sample ingot is corrected by the correction plate when the sample ingot is discharged and fed, and at the same time, a micro pressure sensor is arranged on the correction plate to avoid damage to the sample ingot caused by excessive extrusion. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in conjunction with the drawings.

[0019] Figure 1 is a structural diagram of the present application Figure One ; Figure 2 is a structural diagram of the present application Figure Two ; Figure 3 is a structural diagram between the two side plates in the present application Figure One ; Figure 4 is a structural diagram between the two side plates in the present application Figure Two ; Figure 5 is a structural diagram of the upper roller and the lower roller in the present application; Figure 6 is a structural diagram of the third transmission roller in the present application; Figure 7 is a structural diagram of the fixed plate in the present application; Figure 8 is a structural diagram of the third transmission roller in the present application; Figure 9 is an exploded view of the first sliding block in the present application; Figure 10 is a sectional view of the fixing plate in the application; Figure 11 is Figure 10 is an enlarged view of A in Figure 12 is an expanded view of the annular track groove in the application.

[0020] In the figure: 11, side plate; 12, first through slot; 13, sliding plate; 14, second transmission shaft; 15, upper roller; 16, first transmission shaft; 17, lower roller; 2, upper rotating roller; 21, first L-shaped plate; 22, lower rotating roller; 23, third transmission roller; 24, rubber block; 25, belt pulley; 26, conveyor belt; 3, support plate; 31, first servo motor; 32, first gear; 33, universal transmission shaft; 34, first rotating shaft; 4, second servo motor; 41, first sprocket; 42, second sprocket; 43, synchronous wheel; 44, lead screw; 5, first cavity; 51, second through slot; 52, first sliding block; 53, deviation rectifying plate; 54, fixing plate; 55, first rack; 56, push rod; 57, push plate; 58, second gear; 59, third servo motor; 6, round block; 61, annular plate; 62, third through slot; 63, annular track groove; 64, arc-shaped slot; 65, arc-shaped isosceles trapezoidal slot; 66, sliding rod; 7, first recess; 71, baffle; 72, electromagnetic block; 8, fixing block; 81, second L-shaped block; 82, circular cavity; 83, spiral doctor blade; 84, collection cavity. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, purposes and effects of the application easy to understand, the application will be further described below in conjunction with specific embodiments.

[0022] As Figures 1 to 12As shown, the preparation device of the platinum catalyst standard sample for ammonia oxidation to produce nitric acid comprises a mirror surface tabletting mechanism, the mirror surface tabletting mechanism comprises two symmetrically arranged side plates 11, a first through groove 12 is formed in each of the side plates 11, a sliding plate 13 is slidably connected in the first through groove 12, a second transmission shaft 14 is rotatably connected to the two sliding plates 13, and an upper roller 15 is fixedly connected to the second transmission shaft 14; a first transmission shaft 16 is rotatably connected between the two side plates 11, a lower roller 17 is fixedly connected to the first transmission shaft 16, the sliding plate 13 moves up and down through an adjusting member, the first transmission shaft 16 and the second transmission shaft 14 are drivingly connected through a first transmission member, 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 fixedly connected to the opposite side walls of the two sliding plates 13, an upper roller 2 is rotatably connected to each of the first L-shaped plates 21 on the adjacent sliding plates 13, the upper roller 2 is located directly above the lower roller 22, the first transmission shaft 16 is drivingly connected to the pair of lower rollers 22 through two groups of chain wheels and chains, a group of third transmission rollers 23 are rotatably connected to the two side plates 11, a group of rubber blocks 24 are fixedly connected to the upper roller 2, the lower roller 22 and the third transmission roller 23, a belt wheel 25 is fixedly connected to the third transmission roller 23 and the lower roller 22, and the two belt wheels 25 are drivingly connected through a conveyor belt 26; when sample ingots need to be rolled, the first transmission member drives the first transmission shaft 16 and the second transmission shaft 14 to rotate, and simultaneously drives the third transmission roller 23 to rotate through the belt wheel 25 and the conveyor belt 26, so that the sample ingots are conveyed on one of the group of third transmission rollers 23, the sample ingots are initially rolled by the upper roller 15 and the lower roller 17, after the initial rolling is completed, the sample ingots pass through the upper roller 15 and the lower roller 17, the first transmission member is reversely rotated, thereby driving the sample ingots after the initial rolling to pass through the third transmission roller 23 again, the distance between the upper roller 15 and the lower roller 17 adjusted by the adjusting member is adjusted again, the rolling is performed again, and the rolling is repeated back and forth until the thickness of the required sample ingot is reached, so that the rolling quality of the sample ingot is ensured, manual pushing is not required, direct automatic operation is realized, and the rolling safety of the sample ingot is improved; the upper roller 2 and the lower roller 22 located on the adjacent two sides of the pressing position are simultaneously arranged, thereby facilitating the back-and-forth movement of the sample ingot.

[0023] The first transmission member comprises a support plate 3, a first servo motor 31 is fixedly connected to the support plate 3, an output end of the first servo motor 31 is connected with 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 the first rotating shaft 34 and the first transmission shaft 16, the two first gears 32 are meshed with each other, a universal transmission shaft 33 is arranged between the first rotating shaft 34 and the second transmission shaft 14, and the universal transmission shaft 33 has an extension property; during work, the slide plate 13 drives the upper roller 15 to move up and down, the distance between the upper roller 15 and the lower roller 17 is adjusted, and when the slide plate 13 moves up and down, the first rotating shaft 34 is still able to drive the second transmission shaft 14 to rotate, and the rotation of the upper roller 15 is not affected.

[0024] The adjusting member comprises a second servo motor 4, a positioning plate is fixedly connected between the two side plates 11, the top end of the positioning plate is fixedly connected with the second servo motor 4, a first sprocket 41 is arranged at an output end of the second servo motor 4, a lead screw 44 is rotatably connected in each of the two first through grooves 12, the top end of one of the lead screws 44 is fixedly connected with a second sprocket 42, the first sprocket 41 and the second sprocket 42 are connected through a chain transmission, a synchronous wheel 43 is fixedly connected to each of the two lead screws 44, and the two synchronous wheels 43 are connected through a chain transmission, and the slide plate 13 is connected to the lead screw 44 through a lead screw nut pair; when the second servo motor 4 works, the rotation of the lead screw 44 is facilitated through the arrangement of the first sprocket 41, the second sprocket 42, the synchronous wheel 43 and the chain, the slide plate 13 is adjusted up and down, and the distance between the upper roller 15 and the lower roller 17 is adjusted.

[0025] The third transmission roller 23 is provided with a first cavity 5, a plurality of second through grooves 51 are arranged on the outer side wall of the third transmission roller 23, the second through grooves 51 and the first cavity 5 are communicated with each other, two first sliding blocks 52 are arranged in the first cavity 5, a plurality of deviation rectifying plates 53 are arranged on the outer side wall of each of the first sliding blocks 52, the deviation rectifying plates 53 extend out of the second through grooves 51, and the two first sliding blocks 52 are relatively moved or oppositely moved through a power member; during work, the sample ingot is automatically pushed back and forth, in order to avoid the deviation of feeding or discharging, the deviation rectifying plates 53 are arranged, and the sample ingot is rectified through the pushing of the deviation rectifying plates 53 during discharging and feeding, and a micro pressure sensor is arranged on the deviation rectifying plate 53, so that the sample ingot is prevented from being damaged due to excessive extrusion.

[0026] The power component comprises a third servo motor 59, a pair of symmetrical fixed plates 54 fixed between the two side plates 11, the third servo motor 59 being fixed at the bottom end of the fixed plates 54 through a connecting column, a second gear 58 being installed at the output end of the third servo motor 59, a pair of first racks 55 being symmetrically distributed about the center of the second gear 58 and being slidably connected to the bottom end of the fixed plates 54, the end of the first rack 55 penetrating through the side plate 11 and being fixed with a push plate 57, a group of push rods 56 being fixed on the push plate 57, one end of the push rod 56 penetrating through the side plate 11 and extending into the first cavity 5, the end of the push rod 56 being connected with the first sliding block 52, and the first rack 55 and the second gear 58 being in mesh with each other; when the deviation is corrected, which is at the end of the first rolling, the third servo motor 59 works, the second gear 58 and the first rack 55 are in mesh with each other, and the deviation plate 53 is driven to slide in the second through groove 51, thereby facilitating the deviation correction of the sample ingot (the push rod 56 and the first sliding block 52 are rotatably connected).

[0027] The first sliding block 52 comprises a circular block 6 and an annular plate 61, the circular block 6 being fixed on the end of the push rod 56, the annular plate 61 being rotatably connected to the outer side wall of the circular block 6, a group of third through grooves 62 being formed in the outer side wall of the annular plate 61, the deviation plate 53 being slidably connected to the inner wall of the third through groove 62, a circular track groove 63 being formed in the outer side wall of the circular block 6, a sliding rod 66 being fixed at the bottom end of the deviation plate 53 and slidably connected in the circular track groove 63, and the circular track groove 63 being composed of an arc-shaped groove 64 and an arc-shaped isosceles trapezoidal groove 65; when the material is fed, the deviation plate 53 rotates with the third transmission roller 23 and is in contact with the sample ingot, thereby avoiding the damage to the side wall of the sample ingot caused by the rotating and directly contacting, so the circular track groove 63 is arranged, the deviation plate 53 rotates with the third transmission roller 23 and drives the annular plate 61 to rotate, and the sliding rod 66 slides in the circular track groove 63, thereby the deviation plate 53 enters the arc-shaped isosceles trapezoidal groove 65 through the arc-shaped groove 64, which enables the deviation plate 53 to move and fit, rather than to rotate and directly contact, thereby reducing the damage to the side wall of the sample ingot.

[0028] A group of first recesses 7 are formed in the fixed plate 54, the first recesses 7 and the third transmission roller 23 being staggered, a baffle 71 being fixed at the groove bottom of the first recess 7 through a spring, the baffle 71 being slidably connected to the inner wall of the first recess 7, a pressure sensor being arranged in the side wall of the baffle 71, and the baffle 71 being lifted by the top driving component; when the sample ingot is rolled back and forth, the length of the sample ingot is gradually extended, so the baffle 71 is arranged, which is lifted by the top driving component in sequence to facilitate the positioning of the rolled sample ingot (to avoid the transmission distance of the third transmission roller 23 being too long).

[0029] The top driver includes an electromagnetic block 72, the bottom end of the baffle 71 is magnetic, the bottom of the first groove 7 is fixedly connected with the electromagnetic block 72, when the electromagnetic block 72 is powered, the electromagnetic block 72 and the baffle 71 repel each other; in operation, the electromagnetic block 72 is powered, the electromagnetic block 72 and the baffle 71 repel each other, the baffle 71 moves upwards to block the movement of the sample ingot (generally, the top end of the baffle 71 is lower than the highest point of the third transmission roller 23), the sample ingot is positioned, and the transmission distance is prevented from being too long.

[0030] The upper roller 15 and the lower roller 17 are provided with fixed blocks 8 on one side, the two fixed blocks 8 are fixedly connected with the side wall of the sliding plate 13 and the side wall of the side plate 11 through the second L-shaped blocks 81 at both ends, one side of the fixed block 8 is provided as an arc surface structure, the two fixed blocks 8 are provided with circular cavities 82, one side of the circular cavity 82 is provided as an opening structure, the two spiral scrapers 83 are rotatably connected between the two side walls of the circular cavities 82, one side of the surfaces of the two spiral scrapers 83 extends out of the opening of the circular cavities 82 and is attached to the surfaces of the upper roller 15 and the lower roller 17, the two spiral scrapers 83 are connected with the first transmission shaft 16 and the second transmission shaft 14 through sprocket chains, the fixed block 8 is provided with a collecting cavity 84, and the collecting cavity 84 is communicated with the circular cavity 82; when the upper roller 15 and the lower roller 17 rotate, the spiral scrapers 83 are driven to rotate through the sprocket chains, thereby cleaning the debris adhered to the surfaces of the upper roller 15 and the lower roller 17, the debris scraped off is collected through the collecting cavity 84 in the fixed block 8, and the situation that the debris is pressed again on the surface of the sample ingot to cause uneven surface of the sample ingot is avoided.

[0031] Working principle: When the sample ingot needs to be rolled, the first transmission member drives the first transmission shaft 16 and the second transmission shaft 14 to rotate, and at the same time, the third transmission roller 23 is driven to rotate through the belt wheel 25 and the transmission belt 26, so that the sample ingot is conveyed on the third transmission roller 23, and the sample ingot is initially rolled by the upper roller 15 and the lower roller 17. After the initial rolling is completed, the sample ingot passes through the upper roller 15 and the lower roller 17, and then the first transmission member is reversely rotated to drive the sample ingot after the initial rolling, and the sample ingot is reversely driven by the third transmission roller 23. The distance between the upper roller 15 and the lower roller 17 is adjusted again by the adjusting member, so that the sample ingot can be rolled again. The sample ingot is repeatedly rolled back and forth until the required thickness of the sample ingot is reached, so that the sample ingot can be fully rolled without being damaged, and the rolling quality of the sample ingot can be ensured. At the same time, the sample ingot is automatically pushed back and forth, so that the rolling safety of the sample ingot is improved. The upper roller 2 and the lower roller 22 are arranged on the two sides adjacent to the pressing position, so that the sample ingot can be conveniently moved back and forth. The sample ingot is automatically pushed back and forth, so that the deviation of the feeding and discharging of the sample ingot can be avoided. Therefore, the deviation correcting plate 53 is arranged, and the sample ingot is deviated when the sample ingot is fed and discharged. The micro pressure sensor is arranged on the deviation correcting plate 53, so that the sample ingot can be prevented from being damaged due to excessive extrusion. When the sample ingot is fed, the deviation correcting plate 53 is in contact with the sample ingot while rotating with the third transmission roller 23. In order to prevent the side wall of the sample ingot from being damaged when the sample ingot is in contact with the third transmission roller 23, the annular track groove 63 is arranged. The deviation correcting plate 53 rotates with the third transmission roller 23, and the annular plate 61 is also rotated. Because the sliding rod 66 slides in the annular track groove 63, the deviation correcting plate 53 enters the arc isosceles trapezoidal groove 65 through the arc-shaped groove 64, so that the deviation correcting plate 53 is in contact with the annular plate 61, instead of being directly in contact with the third transmission roller 23, so that the damage to the side wall of the sample ingot is reduced. When the sample ingot is rolled back and forth, the length of the sample ingot is gradually increased. Therefore, the baffle 71 is arranged, and the baffle 71 at different positions is sequentially lifted by the jacking member, so that the rolled sample ingot can be positioned (so that the transmission distance of the third transmission roller 23 is not too long). When the upper roller 15 and the lower roller 17 rotate, the chain wheel and chain drive the spiral scraper roller 83 to rotate, so that the debris adhered to the surface of the upper roller 15 and the lower roller 17 is cleaned. The debris is collected in the collecting cavity 84 arranged in the fixed block 8, so that the debris is prevented from being re-combined on the surface of the sample ingot and causing the surface of the sample ingot to be uneven.

[0032] A preparation method of a platinum catalyst standard sample for ammonia oxidation to produce nitric acid, which uses the preparation device of a platinum catalyst standard sample for ammonia oxidation to produce nitric acid. S1: Put the metal powder into the mold according to a specific ratio, and use vacuum sintering to prepare a preformed block; S2: Put the preformed block into the non-consumable arc melting furnace crystallizer pool, and remelt the preformed block multiple times to obtain a platinum alloy sample ingot with a smooth and regular surface; S3: the mirror surface tablet mechanism is adopted to roll the platinum alloy sample ingot into the required thickness; S4: the laser cutting machine is adopted to cut the rolled sample into the standard size platinum alloy sample.

[0033] The above-mentioned front, rear, left, right, top and bottom are based on the drawings in the specification Figure 1 As a standard, 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.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present application.

[0035] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An apparatus for preparing a platinum catalyst standard sample for ammonia oxidation to nitric acid, characterized by comprising: The mirror surface sheet pressing mechanism comprises two symmetrically arranged side plates (11), each of which is provided with a first through groove (12), a sliding plate (13) is slidably connected in the first through groove (12), a second transmission shaft (14) is rotatably connected between the two sliding plates (13), an upper roller (15) is fixedly connected to the second transmission shaft (14), a first transmission shaft (16) is rotatably connected between the two side plates (11), a lower roller (17) is fixedly connected to the first transmission shaft (16), the sliding plate (13) moves up and down through an adjusting member, the first transmission shaft (16) and the second transmission shaft (14) are drivingly connected through 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 symmetrically distributed about the lower roller (17), a pair of symmetrically distributed first L-shaped plates (21) are fixedly connected to the opposite side walls of the two sliding plates (13), an upper rotating roller (2) is rotatably connected to each of the first L-shaped plates (21) on the adjacent sliding plates (13), the upper rotating roller (2) is located directly above the lower rotating roller (22), the first transmission shaft (16) is drivingly connected to the two lower rotating rollers (22) through two groups of chain wheels and chains, a group of third transmission rollers (23) are rotatably connected to the two side plates (11), a group of rubber blocks (24) are fixedly connected to the third transmission rollers (23), the upper rotating rollers (2) and the lower rotating rollers (22), respectively, a belt wheel (25) is fixedly connected to each of the third transmission rollers (23) and the lower rotating rollers (22), and the belt wheels (25) are drivingly connected through a conveyor belt (26).

2. The device for preparing a standard sample of a platinum catalyst for ammonia oxidation to produce nitric acid according to claim 1, characterized in that, The first transmission member comprises a support plate (3), a first servo motor (31) is fixedly connected to the support plate (3), the output end of the first servo motor (31) is connected with the 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 each of the first rotating shaft (34) and the first transmission shaft (16), the two first gears (32) are in mesh with each other, a universal transmission shaft (33) is arranged between the first rotating shaft (34) and the second transmission shaft (14), and the universal transmission shaft (33) has flexibility.

3. The device for preparing a standard sample of a platinum catalyst for ammonia oxidation to produce nitric acid according to claim 2, characterized in that, The adjusting member comprises a second servo motor (4), a positioning plate is fixedly connected between the two side plates (11), the top end of the positioning plate is fixedly connected with the second servo motor (4), a first chain wheel (41) is mounted to the output end of the second servo motor (4), a lead screw (44) is rotatably connected in each of the two first through grooves (12), the top end of each of the lead screws (44) extends out of the side plate (11), the top end of one of the lead screws (44) is fixedly connected with a second chain wheel (42), the first chain wheel (41) and the second chain wheel (42) are drivingly connected through a chain, a synchronous wheel (43) is fixedly connected to each of the two lead screws (44), and the two synchronous wheels (43) are drivingly connected through a chain, and the sliding plate (13) is connected to the lead screw (44) through a lead screw nut pair.

4. The device for preparing a standard sample of a platinum catalyst for the production of nitric acid by ammonia oxidation according to claim 3, characterized in that, A first cavity (5) is arranged in the third transmission roller (23), a plurality of second through grooves (51) are arranged on the outer wall of the third transmission roller (23), the second through grooves (51) and the first cavity (5) are communicated with each other, two first sliding blocks (52) are arranged in the first cavity (5), a plurality of deviation rectifying plates (53) are arranged on the outer wall of the first sliding block (52), the deviation rectifying plates (53) extend out of the second through grooves (51), and the two first sliding blocks (52) relatively move or oppositely move through a power element.

5. The device for preparing a standard sample of a platinum catalyst for the production of nitric acid by ammonia oxidation according to claim 4, characterized in that, The power element comprises a third servo motor (59), a pair of symmetrical fixed plates (54) are fixedly connected between the two side plates (11), the third servo motor (59) is fixedly connected to the bottom end of the fixed plate (54) through a connecting column, a second gear (58) is arranged on the output end of the third servo motor (59), a pair of first racks (55) which are symmetrically distributed about the center of the second gear (58) are slidably connected to the bottom end of the fixed plate (54), the end portion of the first rack (55) penetrates through the side plate (11) and is fixedly connected with a push plate (57), a plurality of push rods (56) are fixedly connected to the push plate (57), one end of the push rod (56) penetrates through the side plate (11) and extends into the first cavity (5), the end portion of the push rod (56) is connected with the first sliding block (52), and the first rack (55) and the second gear (58) are meshed with each other.

6. The device for preparing a standard sample of a platinum catalyst for the production of nitric acid by ammonia oxidation according to claim 5, characterized in that, The first sliding block (52) comprises a circular block (6) and an annular plate (61), the circular block (6) is fixedly connected to the end portion of the push rod (56), the annular plate (61) is rotatably connected to the outer wall of the circular block (6), a plurality of third through grooves (62) are arranged on the outer wall of the annular plate (61), the deviation rectifying plate (53) is slidably connected to the inner wall of the third through groove (62), an annular track groove (63) is arranged on the outer wall of the circular block (6), a sliding rod (66) is fixedly connected to the bottom end of the deviation rectifying plate (53), the sliding rod (66) is slidably connected in the annular track groove (63), and the annular track groove (63) is composed of an arc-shaped groove (64) and an arc-shaped isosceles trapezoidal groove (65).

7. The device for preparing a standard sample of a platinum catalyst for the production of nitric acid by ammonia oxidation according to claim 6, characterized in that, A plurality of first grooves (7) are arranged on the fixed plate (54), the first grooves (7) and the third transmission roller (23) are staggered, the groove bottom of the first groove (7) is fixedly connected with a baffle (71) through a spring, the baffle (71) is slidably connected to the inner wall of the first groove (7), the baffle (71) is provided with a pressure sensor in the sidewall, and the baffle (71) moves upward through a jacking element.

8. The device for preparing a standard sample of a platinum catalyst for the production of nitric acid by ammonia oxidation according to claim 7, characterized in that, The jacking element comprises an electromagnetic block (72), the bottom end of the baffle (71) has magnetism, the groove bottom of the first groove (7) is fixedly connected with the electromagnetic block (72), when the electromagnetic block (72) is electrified, the electromagnetic block (72) and the baffle (71) repel each other.

9. The device for preparing a standard sample of a platinum catalyst for the production of nitric acid by ammonia oxidation according to claim 8, characterized in that, The upper roller (15) and the lower roller (17) are provided with fixed blocks (8) on one side, the upper and lower fixed blocks (8) are fixedly connected with the side wall of the sliding plate (13) and the side wall of the side plate (11) through the second L-shaped blocks (81) at both ends, the side of the fixed block (8) is provided as an arc surface structure, the circular cavities (82) are arranged in the two fixed blocks (8), the side of the circular cavity (82) is provided as an opening structure, the spiral scraping rollers (83) are rotatably connected between the two side walls of the two circular cavities (82), the surfaces of the two spiral scraping rollers (83) are provided on one side and extend out of the opening of the circular cavity (82) and are attached to the surfaces of the upper roller (15) and the lower roller (17), the two spiral scraping rollers (83) are connected with the first transmission shaft (16) and the second transmission shaft (14) through sprocket chains, and the collecting cavities (84) are arranged in the fixed blocks (8) and are communicated with the circular cavities (82).

10. A method for preparing a platinum catalyst standard sample for ammonia oxidation for producing nitric acid, the method using the apparatus for preparing a platinum catalyst standard sample for ammonia oxidation for producing nitric acid according to claim 9, characterized by: The preparation method comprises the following steps: S1: according to a specific proportion, metal powder is put into a mold, and a preform block is prepared by vacuum sintering; S2: the preform block is put into a non-consumable arc smelting furnace crystallizer molten pool, the preform block is remelted for multiple times, and a platinum alloy sample ingot with smooth and regular surface is obtained; S3: a mirror surface sheet pressing mechanism is used to roll the platinum alloy sample ingot into a required thickness; S4: a laser cutting machine is used to cut the rolled sample sheet into a standard size platinum alloy sample sheet.

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