CN109437984B - Production device for converting large urea particles into medium urea particles and operation process - Google Patents

Abstract

The invention discloses a production device and an operation process for converting large urea particles into medium particles, the invention generates the molten urea into the particles with different sizes under the action of fluidized air through a combined granulation rotary drum, a sieving device is connected with the combined granulation rotary drum through a conveying pipeline, the sieving device comprises a mixing chamber, an isolation channel and a filtering chamber, the mixing chamber comprises a rotating shaft, a dispersing rod, a sleeve, a rotating rod and a dispersing grid, the filtering chamber is respectively provided with a first filtering plate and a second filtering plate from top to bottom, the crushing device comprises a crushing roller, a hydraulic rod, a pressure relief piece, a first fixing plate, a second fixing plate and a screw rod, a cooler is respectively connected with the mixing chamber, the filtering chamber and the crushing device through the conveying channel, a tail gas processor is used for collecting waste gas generated by the process, a monitor comprises an A/D converter, a control unit, a data quantitative analysis unit and a power supply unit, the method is used for monitoring the process in real time.

Description

Production device for converting large urea particles into medium urea particles and operation process

Technical Field

The invention belongs to the technical field of chemical production, and particularly relates to a production device for converting large urea particles into medium urea particles and an operation process.

Background

The granulation of urea with a fluidized bed is known. This method involves spraying fine droplets of a high concentration, typically 96% or more, urea solution onto fluidized bed particles. The urea solution is also called growth liquid of the fluidized bed. Small solid particles (generally less than 2mm in diameter) of the same or different substances, called seeds, are also fed into the fluid bed, thus acting as an initial point for the continuous deposition of the growth liquid to facilitate the granulation operation. The seeds and growing granules of urea then form a bed. Typically, the fluidization process is carried out under air.

In conventional processes, the particles transported by the fluidized bed are screened and oversized and undersized particles are used as seed material, e.g., undersized particles are directed back into the fluidized bed and oversized particles are crushed for further production of seed material. Along with the international urea price reduction in recent years, the profit margin of the urea market in China gradually becomes smaller, most of domestic urea manufacturers lose, and because the land of China is reclaimed, the soil nutrient imbalance is caused by the mass use of urea as a nitrogen fertilizer or an additional fertilizer, the soil nutrient condition is worsened due to soil erosion, excessive reclamation predation type operation and industrial and agricultural production, the fertilizer has short fertilizer effect period, unbalanced nutrient supply and unbalanced nutrient supply, in order to meet the market requirement and convert the large-particle urea into medium-particle urea, a urea workshop firstly adjusts the sizes of the upper and lower layer screens of the vibrating screen, although the product particles meet the standard requirements of medium particles, the returned material crystal seeds are more, the operation period of the device is short, and urea particles with different sizes cannot be well classified and collected, so that the medium particle collection amount is low, and a large amount of manpower and material resources are needed; when simultaneously carrying out the breakage to the large granule urea after collecting, interval between the regulation breaker that can not be fine, it is great to appear standing the granule when retrieving urea easily, reduces recovery productivity ratio. In a word, a screen which is convenient to screen and can quickly adjust the distance between the crushers when crushing is carried out is needed, and the recovery efficiency is improved.

Disclosure of Invention

Aiming at the technical problems, the invention provides a production device and an operation process for converting large urea particles into medium urea particles.

The technical scheme of the invention is as follows: a production device for converting large urea particles into medium particles comprises a combined granulation rotary drum, a screening device, a crushing device, a cooler, a combined cooling rotary drum, a tail gas processor and a monitor, wherein the combined granulation rotary drum generates molten urea into particles with different sizes under the action of fluidized air, the screening device is connected with the combined granulation rotary drum through a conveying pipeline and comprises a mixing chamber, an isolation channel and a filtering chamber, a feeding hole is formed above the screening device, the mixing chamber is fixed at the middle upper end of the screening device and comprises a rotating shaft, dispersing rods, sleeves, rotating rods and dispersing grids, the rotating shaft penetrates through the middle of the screening device, the two groups of dispersing rods are symmetrically fixed at the left side and the right side of the rotating shaft, the two sleeves are sleeved outside the dispersing rods, the rotating rods are respectively fixed at the upper side and the lower side of each sleeve, and the dispersing grids are fixed on the rotating rods at the same side, the separation channel is fixed at the middle end of the screen, the slow material ports are uniformly distributed in the separation channel, the filter chamber is respectively provided with a first filter plate and a second filter plate from top to bottom, the separating plates are respectively arranged above the first filter plate and the second filter plate, the spring rods are respectively arranged on the separating plates and are connected with the inner wall of the mixing chamber, the other ends of the spring rods are sleeved on the rotating shaft through a sleeve, the outer wall of the rotating shaft is provided with a sliding chute, the sleeve moves up and down on the rotating shaft through the sliding chute, an air cavity is fixed above the separating plates, the lower end of the air cavity is provided with an air outlet, the lower end of the separating plates is fixed with a telescopic device, the lower end of the telescopic device is fixed with brush hair, the filter chamber is provided with a material distribution port, the material distribution port respectively corresponds to the first filter plate and the second filter plate, the material distribution port is externally connected with a material return channel, the lower end of the filter chamber is provided with a material outlet, and the gas concentration sensors are arranged in the mixing chamber and the filter chamber, the crusher is connected with the feed back channel and comprises a crushing roller, a hydraulic rod, a pressure relief piece, a first fixing plate, a second fixing plate and a lead screw, wherein the pressure relief piece is connected to one side of the crushing roller, the hydraulic rod is connected with the pressure relief piece through a movable cavity, a spring is arranged between the hydraulic rod and the far end of the movable cavity, the first fixing plate is fixed at the near end of the hydraulic rod, the second fixing plate is fixed at the outer wall of the movable cavity, the lead screw is positioned between the first fixing plate and the second fixing plate, the hydraulic rod moves on the lead screw through driving the first fixing plate, the cooler is respectively connected with the mixing chamber, the filter chamber and the crusher through a conveying channel, the combined cooling drum is connected with the discharge port through a conveying pipeline, the tail gas processor is used for collecting waste gas generated by the process, and the monitor comprises an A/D converter, a control unit, a data quantization analysis unit, And the power supply unit is used for monitoring the process in real time.

Further, the buffering material port is narrow at the upper end and the lower end, and is wide in the middle, and a temperature sensor probe is arranged inside the buffering material port and is electrically connected with the monitor, so that the real-time temperature of the screening device can be conveniently known.

Further, the dispersing grids, the first filter plate and the second filter plate are coated with anti-adhesion materials, and the anti-adhesion materials comprise the following components in parts by weight: 40-50 parts of polycaprolactone, 13-15 parts of glass fiber, 20-25 parts of sodium dodecyl sulfate, 20-26 parts of octylphenol polyvinyl ether, 8-10 parts of rosin polyoxyethylene ether sodium sulfonate and 4-6 parts of triphenyl phosphite, so that the particles are prevented from being stuck on a device.

Further, the expansion piece passes through the pull rod with the separator plate links to each other, and the pull rod lower extreme is equipped with the fixed block, both ends are equipped with the spring beam about the fixed block, link to each other through connecting rod and pull rod between the spring beam, the connecting rod vertical direction middle part is run through and is equipped with the push rod, the pot head has the spring under the push rod, and the push rod lower extreme is equipped with pastes the board, the brush hair is located paste the board below, guarantee the brush hair to the complete clearance of granule.

Further, the pressure release piece includes the bolt hole, left splint, right splint, slow clamping ring, shank of bolt, nut, the bolt hole runs through in the vertical direction of pressure release piece, the vertical fixation of left side splint is at the bolt hole inner wall, the vertical fixation of right side splint is at the bolt hole inner wall, slow clamping ring endotheca is in the bolt hole, the shank of bolt is fixed in slow clamping ring, the nut has two, respectively with bolt hole upper and lower both ends threaded connection for fixed left splint and right splint guarantee broken abundant.

Furthermore, the screening device, the crushing device and the cooling device are connected with a data recorder, the data of the operation of the device are recorded through the data recorder, the data are recorded under the large-scale screening and cooling work, the most reasonable scheme is selected, and the operation of the device is optimized.

Further, the operating process of the production device for converting the urea large particles into the medium particles comprises the following steps:

1) molten urea is generated into particles with different sizes in a combined granulation rotary drum under the action of flowing air, the generated particle urea is conveyed into a screening device through a conveying channel, the urea is poured into the screening device through a feeding hole, the screening device is cooled by a cooler, a rotating shaft in a mixing chamber rotates to drive a dispersing rod to carry out stirring treatment, and a rotating rod further stirs a dispersing grid under the action of a sleeve;

2) after urea is stirred in the mixing chamber, the temperature of the stirred urea is monitored by the isolating channel, and information is fed back to the detector, so that the temperature in the screening device is controlled, the urea falls into the filtering chamber by the isolating channel, the separating plate in the filtering chamber rotates under the action of the rotating shaft, the air chamber exhausts air to the first filtering plate and the second filtering plate through the air outlet, urea with different sizes is classified and screened, large particles are discharged from the first filtering plate, medium particles are discharged from the second filtering plate, and small particles are discharged from the discharge port;

3) simultaneously the separator plate drives through the spring beam and reciprocates, the promotion pull rod passes through the spring beam and removes at the fixed block, thereby promote the push rod and remove downwards, make the first filter of laminating and the second filter that the brush hair is better, guarantee that different granule is discharged completely, large granule and tiny particle carry and carry out broken handle in the cracker through transfer passage, the cracker drives the hydraulic stem and removes the distance that promotes between the crushing roller in the activity intracavity through the effect of lead screw, carry out broken handle to the large granule, well granule passes through transfer passage and carries in the combination cooling rotary drum.

4) The tail gas treater collects the gas produced in the production process, and the monitor monitors each device in real time, and conveys the urea which does not conform to the medium particles to the melting device for re-granulation treatment.

Compared with the prior art, the invention has the beneficial effects that: the invention has reasonable structure, screens urea particles with different sizes after production, improves the efficiency of the particle urea during production, ensures full screening and less mixing by multi-stage screening, can quickly adjust the distance between crushers by crushing treatment on non-conforming particles, has less particles after crushing, is convenient to recover, greatly reduces the cost of the whole set of equipment in the whole process, has low consumption and improves the working efficiency.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic of the construction of the screen of the present invention;

FIG. 3 is a schematic view of the construction of the retractor of the present invention;

FIG. 4 is a schematic view of the shredder of the present invention;

wherein, 1-combined granulating rotary drum, 2-screen, 21-mixing chamber, 210-chute, 211-rotary shaft, 212-dispersing rod, 213-sleeve, 214-rotary shaft, 215-dispersing grid, 22-isolating channel, 221-buffer port, 23-filter chamber, 230-discharge port, 231-first filter plate, 232-second filter plate, 234-spring rod, 235-sleeve, 236-air chamber, 237-air outlet, 238-expansion device, 239-brush hair, 240-distribution port, 241-pull rod, 242-fixed block, 243-spring rod, 245-connecting rod, 246-push rod, 247-sticking plate, 24-feed port, 3-crusher, 31-crushing roller, 32-hydraulic rod, 33-pressure relief piece, 331-bolt hole, 332-left clamping plate, 333-right clamping plate, 334-pressure relief ring, 335-bolt rod, 336-nut, 34-first fixing plate, 35-second fixing plate, 36-lead screw, 37-movable cavity, 4-cooler, 5-combined cooling rotary drum and 6-tail gas processor.

Detailed Description

Example (b):

a production device for converting large urea particles into medium particles comprises a combined granulation rotary drum 1, a screening device 2, a crushing device 3, a cooling device 4, a combined cooling rotary drum 5, a tail gas processor 6 and a monitor, wherein a data recorder is connected outside the screening device 2, the crushing device 3 and the cooling device 4, the data recorder records the operation data of the device and records the operation data under a large amount of screening and cooling work to select the most reasonable scheme, the operation of the device is optimized, the combined granulation rotary drum 1 generates molten urea into particles with different sizes under the action of fluidizing air, the screening device 2 is connected with the combined granulation rotary drum 1 through a conveying pipeline, the screening device 2 comprises a mixing chamber 21, an isolation channel 22 and a filtering chamber 23, a feeding port 24 is arranged above the screening device 2, the mixing chamber 21 is fixed at the upper end of the screening device, the mixing chamber 21 comprises a rotating shaft 211 and a dispersion rod 212, Sleeve 213, rotating rod 214, dispersing grid 215, rotating shaft 211 runs through the middle of the screen 2, dispersing rod 212 has two sets, symmetrically fixed on the left and right sides of rotating shaft 211, dispersing rod 212 is sleeved with two sleeve 216, rotating rod 214 is fixed on the upper and lower sides of sleeve 215 respectively, dispersing grid 215 is fixed on rotating rod 214 on the same side, isolating channel 22 is fixed on the middle end of screen 2, the inside of isolating channel 22 is uniformly distributed with slow material opening 221, slow material opening 221 is a structure with narrow upper and lower ends and wide middle, the inside is provided with temperature sensor probe, temperature sensor probe is electrically connected with monitor 6, filter chamber 23 is provided with first filter plate 231 and second filter plate 232 from top to bottom respectively, separating plates 233 are arranged above first filter plate 231 and second filter plate 232, separating plates 233 are provided with spring rods 234 respectively, spring rods 234 are connected with the inner wall of mixing chamber 23, the other end is sleeved on the rotating shaft 211 through a sleeve 235, the outer wall of the rotating shaft 211 is provided with a sliding chute 210, the sleeve 235 moves up and down on the rotating shaft 211 through the sliding chute 210, an air cavity 236 is fixed above the separating plate 233, the lower end of the air cavity 236 is provided with an air outlet 237, the lower end of the separating plate 233 is fixed with an expansion piece 238, the expansion piece 238 is connected with the separating plate 233 through a pull rod 241, the lower end of the pull rod 241 is provided with a fixed block 242, the left end and the right end of the fixed block 242 are provided with spring rods 243, the spring rods 243 are connected with the pull rod 241 through a connecting rod 245, the middle part of the connecting rod 245 in the vertical direction is provided with a push rod 246 in a penetrating manner, the lower end of the push rod 246 is provided with an adhesive plate 247, the bristles 239 are positioned below the adhesive plate 247, the lower end of the expansion piece 238 is fixed with bristles 239, the filter chamber 23 is provided with material distributing ports 240, the material distributing ports 240 are respectively corresponding to the first filter plate 231 and the second filter plate 232, the material distributing ports 240 are externally connected with material returning channels, the lower end of the filter chamber 23 is provided with a discharge hole 230, gas concentration sensors are arranged in the mixing chamber 21 and the filter chamber 23, the crusher 3 is connected with a feed back channel, the crusher 3 comprises a crushing roller 31, a hydraulic rod 32, a pressure relief piece 33, a first fixing plate 34, a second fixing plate 35 and a lead screw 36, one side of the crushing roller 31 is connected with the pressure relief piece 33, the pressure relief piece 33 comprises a bolt hole 331, a left clamp plate 332, a right clamp plate 333, a pressure relief ring 334, a bolt rod 335 and a nut 336, the bolt hole 331 penetrates through the pressure relief piece 33 in the vertical direction, the left clamp plate 332 is vertically fixed on the inner wall of the bolt hole 331, the right clamp plate 333 is vertically fixed on the inner wall of the bolt hole 331, the pressure relief ring 334 is sleeved in the bolt hole 331, the bolt rod 335 is fixed in the pressure relief ring 334, the nut 336 is provided with two nuts 336 which are respectively in threaded connection with the upper end and the lower end of the bolt hole 331 and used for fixing the left clamp plate 332 and the right clamp plate 333, the hydraulic rod 32 is connected with the pressure relief piece 33 through a movable cavity 37, a spring 244 is arranged between the hydraulic rod 32 and the far end of the movable cavity 37, the first fixed plate 34 is fixed at the near end of the hydraulic rod 32, the second fixed plate 35 is fixed at the outer wall of the movable cavity 37, the lead screw 36 is positioned between the first fixed plate 34 and the second fixed plate 35, the hydraulic rod 32 drives the first fixed plate 34 to move on the lead screw 36, the cooler 4 is respectively connected with the mixing chamber 21, the filter chamber 23 and the crusher 3 through a conveying channel, the combined cooling drum 5 is connected with the discharge port 230 through a conveying pipeline, the tail gas processor 6 is used for collecting waste gas generated by the process, the monitor comprises an A/D converter, a control unit, a data quantitative analysis unit and a power supply unit and is used for monitoring the process in real time, the dispersing grid 215, the first filter plate 231 and the second filter plate 232 are coated with anti-sticking materials, and the anti-sticking materials consist of the following components in parts by weight: 40-50 parts of polycaprolactone, 13-15 parts of glass fiber, 20-25 parts of sodium dodecyl sulfate, 20-26 parts of octylphenol polyvinyl ether, 8-10 parts of rosin polyoxyethylene ether sodium sulfonate and 4-6 parts of triphenyl phosphite.

The operating process of a production device for converting large urea particles into medium urea particles comprises the following steps:

1) molten urea is generated into particles with different sizes in the combined granulation rotary drum 1 under the action of air with flow velocity, the generated particle urea is conveyed into the sieving device 2 through the conveying channel, the urea is poured into the sieving device 2 through the feeding hole, the sieving device 2 is cooled by the cooler 4, the rotating shaft 211 in the mixing chamber 21 rotates to drive the dispersing rod 212 to carry out stirring treatment, and the dispersing grid 215 is further stirred by the rotating rod 214 under the action of the sleeve 216;

2) after the mixing chamber 21 stirs the urea, the isolation channel 22 monitors the temperature of the urea after the stirring, and feeds the information back to the detector 6, thereby controlling the temperature in the sieving device 2, the isolation channel 22 drops the urea into the filtering chamber 23, the separation plate 233 in the filtering chamber 23 rotates under the action of the rotating shaft 211, the air chamber 236 exhausts the air to the first filtering plate 231 and the second filtering plate 232 through the air outlet 237, the urea with different sizes is classified and sieved, the large particles are exhausted from the first filtering plate 231, the medium particles are exhausted from the second filtering plate 232, and the small particles are exhausted through the discharge outlet 230;

3) meanwhile, the separation plate 233 is driven by the spring rod 234 to move up and down, the push pull rod 241 is moved on the fixing block 242 through the spring rod 234, thereby pushing the push rod 246 to move down, the first filter plate 231 and the second filter plate 232 which are better attached by the brush bristles 239 are made, complete discharge of different particles is ensured, large particles and small particles are conveyed into the crusher 3 through the conveying channel to be crushed, the crusher 3 drives the hydraulic rod 32 to move in the movable cavity 37 through the action of the lead screw 36 to push the distance between the crushing rollers 31, the large particles are crushed, and the medium particles are conveyed into the combined cooling drum 5 through the conveying channel.

4) The tail gas processor 6 collects and processes gas generated in the production process, the monitor monitors each device in real time, and urea which does not conform to medium particles is conveyed into the melting device for re-granulation processing.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (6)

1. A production device for converting large urea particles into medium urea particles is characterized by mainly comprising a combined granulation rotary drum (1), a screening device (2), a crushing device (3), a cooling device (4), a combined cooling rotary drum (5), an exhaust gas processor (6) and a monitor, wherein the combined granulation rotary drum (1) enables molten urea to generate particles with different sizes under the action of fluidized air, the screening device (2) is connected with the combined granulation rotary drum (1) through a conveying pipeline, the screening device (2) comprises a mixing chamber (21), an isolation channel (22) and a filtering chamber (23), a feeding hole (24) is formed above the screening device (2), the mixing chamber (21) is fixed at the middle upper end of the screening device, the mixing chamber (21) comprises a rotating shaft (211), a dispersing rod (212), a sleeve (213), a rotating rod (214) and a dispersing grid (215), and the rotating shaft (211) penetrates through the middle part of the screening device (2), the dispersing rods (212) are provided with two groups and symmetrically fixed on the left side and the right side of the rotating shaft (211), two sleeves (213) are sleeved outside the dispersing rods (212), the rotating rods (214) are respectively fixed on the upper side and the lower side of the sleeves (213), the dispersing grids (215) are fixed on the rotating rods (214) on the same side, the isolating channel (22) is fixed at the middle end of the sieving device (2), slow material openings (221) are uniformly distributed in the isolating channel (22), the filtering chamber (23) is respectively provided with a first filtering plate (231) and a second filtering plate (232) from top to bottom, separating plates (233) are respectively arranged above the first filtering plate (231) and the second filtering plate (232), the separating plates (233) are respectively provided with a first spring rod (234), the first spring rod (234) is connected with the inner wall of the filtering chamber (23), and the other end of the first spring rod (234) is sleeved outside the rotating shaft (211), the outer wall of the rotating shaft (211) is provided with a sliding groove (210), the sleeve (235) moves up and down in the rotating shaft (211) through the sliding groove (210), an air cavity (236) is fixed above the separating plate (233), an air outlet (237) is formed in the lower end of the air cavity (236), an expansion piece (238) is fixed at the lower end of the separating plate (233), bristles (239) are fixed at the lower end of the expansion piece (238), a material distributing opening (240) is formed in the filtering chamber (23), the material distributing opening (240) corresponds to the first filtering plate (231) and the second filtering plate (232) respectively, a material returning channel is externally connected to the material distributing opening (240), a material discharging opening (230) is formed in the lower end of the filtering chamber (23), gas concentration sensors are arranged in the mixing chamber (21) and the filtering chamber (23), the crusher (3) is connected with the material returning channel, and the crusher (3) comprises a crushing roller (31), a hydraulic rod (32), The combined cooling drum (5) is connected with the discharge hole (230) through a conveying pipeline, one side of the crushing roller (31) is connected with the pressure relief piece (33), the hydraulic rod (32) is connected with the pressure relief piece (33) through a movable cavity (37), a spring is arranged between the hydraulic rod (32) and the far end of the movable cavity (37), the first fixing plate (34) is fixed at the near end of the hydraulic rod (32), the second fixing plate (35) is fixed on the outer wall of the movable cavity (37), the screw rod (36) is positioned between the first fixing plate (34) and the second fixing plate (35) and is internally provided with the spring, the hydraulic rod (32) drives the first fixing plate (34) to move on the screw rod (36), the cooler (4) is respectively connected with the mixing chamber (21), the filter chamber (23) and the crusher (3) through the conveying channel, the tail gas processor is used for collecting waste gas generated by the process, and the monitor comprises an A/D converter, a control unit, a data quantitative analysis unit and a power supply unit and is used for monitoring the process in real time.

2. The apparatus for producing large urea particles into medium urea particles as claimed in claim 1, wherein the buffer port (221) is a structure with narrow upper and lower ends and wide middle, and a temperature sensor probe is arranged inside the buffer port and electrically connected to the monitor.

3. The apparatus for converting urea macroparticles into mesoparticles according to claim 1, wherein the dispersing grid (215), the first filter plate (231) and the second filter plate (232) are coated with an anti-sticking material, the anti-sticking material comprising the following components in parts by weight: 40-50 parts of polycaprolactone, 13-15 parts of glass fiber, 20-25 parts of sodium dodecyl sulfate, 20-26 parts of octylphenol polyvinyl ether, 8-10 parts of rosin polyoxyethylene ether sodium sulfonate and 4-6 parts of triphenyl phosphite.

4. The production device for converting large urea particles into medium urea particles as claimed in claim 1, wherein the expansion piece (238) is connected with the separation plate (233) through a pull rod (241), a fixed block (242) is arranged at the lower end of the pull rod (241), two spring rods (243) are arranged at the left end and the right end of the fixed block (242), the two spring rods (243) are connected with the pull rod (241) through a connecting rod (245), a push rod (246) penetrates through the middle part of the connecting rod (245) in the vertical direction, a spring is sleeved at the lower end of the push rod (246), an adhesive plate (247) is arranged at the lower end of the push rod (246), and the bristles (239) are positioned below the adhesive plate (247).

5. The production device for converting large urea particles into medium urea particles as claimed in claim 1, wherein the pressure relief member (33) comprises a bolt hole (331), a left clamping plate (332), a right clamping plate (333), a pressure relief ring (334), a bolt rod (335) and a nut (336), the bolt hole (331) penetrates through the pressure relief member (33) in the vertical direction, the left clamping plate (332) is vertically fixed on the inner wall of the bolt hole (331), the right clamping plate (333) is vertically fixed on the inner wall of the bolt hole (331), the pressure relief ring (334) is sleeved in the bolt hole (331), the bolt rod (335) is fixed in the pressure relief ring (334), and the nut (336) has two nuts, which are respectively in threaded connection with the upper end and the lower end of the bolt hole (331) and are used for fixing the left clamping plate (332) and the right clamping plate (333).

6. A production facility for converting urea large particles into medium particles according to claim 1, wherein the sieving device (2), the crushing device (3) and the cooling device (4) are externally connected with a data recorder, and the data recorder records the operation data of the facility and records the operation data under a large amount of sieving and cooling operations, so as to select the most reasonable scheme and optimize the operation of the facility.

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