Azobisisobutyronitrile low-temperature crystallization hanging wall cleaning device

Abstract

The invention relates to the technical field of chemical equipment, in particular to an azodiisobutyronitrile low-temperature crystallization hanging wall cleaning device which is used for cleaning crystals on a refrigeration pipe network in a crystallization kettle, the refrigeration pipe network comprises a refrigeration auxiliary pipe, and the refrigeration auxiliary pipe is used for absorbing heat of raw materials; the azobisisobutyronitrile low-temperature crystallization hanging wall cleaning device comprises a scraping mechanism, and the scraping mechanism is arranged on the refrigeration auxiliary pipe and can slide in the extending direction of the refrigeration auxiliary pipe in a reciprocating mode so as to scrape crystals on the refrigeration auxiliary pipe. During use, the scraping mechanism is driven to slide back and forth in the extending direction of the auxiliary refrigerating pipe, and in the sliding process of the scraping mechanism, the scraping mechanism synchronously scrapes crystals on the auxiliary refrigerating pipe, so that on one hand, the crystals on the auxiliary refrigerating pipe can be cleaned in time, and the heat exchange efficiency between the auxiliary refrigerating pipe and raw materials is prevented from being affected; and on the other hand, crystal substances on the refrigeration auxiliary pipe can be scraped without shutdown, and the production efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, in particular to a device for cleaning azobisisobutyronitrile low-temperature crystallization wall hanging. Background Art

[0002] Azobisisobutyronitrile (AIBN) is a white columnar crystal or powdered organic compound with the chemical formula C8H12N4. It is a well-known azo-type free radical initiator and is widely used in polymer polymerization reactions. For example, it can be used as a polymerization initiator for polyvinyl chloride, polyvinyl acetate, polyacrylonitrile, plexiglass and polystyrene. In addition, it can also be used as a foaming agent for plastics and rubber.

[0003] Under low temperature conditions, azobisisobutyronitrile can be refined by recrystallization. The specific process is to dissolve the crude azobisisobutyronitrile in ethanol, filter the filtrate through low temperature crystallization, and then filter by suction. The ethanol in the filtrate can be recycled, and the filter cake is dried at low temperature to obtain the finished product.

[0004] In the process of low-temperature crystallization of azobisisobutyronitrile, crystallization equipment is required. During the operation of most crystallization equipment, crystals will adhere to the refrigeration pipes or the inner wall of the tank. The longer the operation time, the thicker the crystals, which seriously prolongs the operation time of the crystallization equipment and affects the production efficiency of azobisisobutyronitrile.

[0005] When cleaning the crystals adhered to the inner wall of the tank, in the related technology, such as Chinese patent CN220142644U, a self-cleaning crystallization kettle for chemical production is disclosed. After the rotating rod of the self-cleaning crystallization kettle for chemical production rotates, the cleaning blades can be driven to rotate synchronously to clean the inner wall surface of the crystallization kettle. At the same time, the air pump is started, and the generated gas can be introduced into the inside of the gas transmission plate through the air guide pipe, and finally discharged from the opened air outlet. The gas can be blown to the inner wall surface of the crystallization kettle to blow off the residual crystals adhered to the inner wall surface of the crystallization kettle, so as to avoid a small amount of crystals adhering to the inner wall of the crystallization kettle.

[0006] When cleaning the crystals adhered to the refrigeration pipes, manual cleaning or heating and dissolving are usually adopted. Both methods will increase the manufacturing cost of azobisisobutyronitrile, and the crystallization equipment cannot work during the cleaning of the crystals, thereby affecting the production efficiency of azobisisobutyronitrile. Summary of the invention

[0007] Based on this, it is necessary to provide a low-temperature crystal wall cleaning device for azobisisobutyronitrile in order to solve the problem of low production efficiency in the current azobisisobutyronitrile production process.

[0008] The above purpose is achieved through the following technical solutions: A device for cleaning the wall of azobisisobutyronitrile low-temperature crystals is used for cleaning crystals on a refrigeration network in a crystallization kettle. The refrigeration network comprises a refrigeration sub-pipe, and the refrigeration sub-pipe is used to absorb the heat of a raw material. The device for cleaning the wall of azobisisobutyronitrile low-temperature crystals comprises a scraping mechanism, which is arranged on the refrigeration sub-pipe and can slide back and forth along the extension direction of the refrigeration sub-pipe to scrape off the crystals on the refrigeration sub-pipe.

[0009] Furthermore, the scraping mechanism includes a base tube, the base tube is sleeved on the refrigeration auxiliary tube, and two first scraping parts are symmetrically arranged at the end of the base tube. The first scraping parts are arranged in a triangular structure with the tip facing outward.

[0010] Further, the base tube includes two symmetrically arranged arc-minute seats, the two first scraping parts and the two arc-minute seats are arranged correspondingly, and the two arc-minute seats can move relative to each other in the radial direction to change the diameter of the base tube; the azobisisobutyronitrile low-temperature crystallization wall cleaning device also includes an adjusting mechanism, and the adjusting mechanism is configured to be able to adjust the diameter of the base tube according to the hardness of the crystals on the refrigeration auxiliary pipe, so that the two arc-minute seats are arranged closer to each other when the hardness of the crystals on the refrigeration auxiliary pipe is greater.

[0011] Furthermore, the adjustment mechanism includes a sensing part and an adjustment part, the sensing part is configured to sense the hardness of the crystals on the refrigeration auxiliary pipe; the adjustment part is configured to adjust the distance between the two arc seats according to the hardness of the crystals on the refrigeration auxiliary pipe sensed by the sensing part.

[0012] Furthermore, the sensing part includes two arc sensing pieces, which are symmetrically inserted into the base tube, arranged one-to-one with the arc seats, and can slide elastically along the axial direction of the base tube; the outer end of the arc sensing piece exceeds the tip of the first scraping part.

[0013] Furthermore, the adjustment portion includes two V-shaped holes, four push columns and four wedge blocks, the two V-shaped holes are symmetrically opened at the ends of the base tube and are arranged one-to-one with the first scraping portion, the large end of the V-shaped hole is arranged outward and passes through the tip of the first scraping portion; the four push columns are divided into two groups, and the two push columns in the same group are symmetrically arranged on the outer arc surface of the arc sensing piece; the four wedge blocks are divided into two groups, and the two wedge blocks in the same group are symmetrically arranged on the inner arc surface of the arc seat and are located on both sides of the V-shaped hole, the push columns and the wedge surfaces of the wedge blocks form a guiding fit, and when the push columns move inward, the wedge blocks have a tendency to move in the direction close to the V-shaped hole.

[0014] Furthermore, the small end of the V-shaped hole is configured as a circular structure.

[0015] Furthermore, the azobisisobutyronitrile low-temperature crystal wall cleaning device also includes a pumping mechanism, which is configured to be able to suck the liquid on the outside of the base tube into between the arc sensing plate and the refrigeration auxiliary pipe to flush the area between the arc sensing plate and the refrigeration auxiliary pipe.

[0016] Further, the extraction and washing mechanism includes two flushing components, and the two flushing components are arranged corresponding to the arc-sensing piece and the arc-dividing seat on the same side; the flushing component includes a first sink groove, a second sink groove, a piston bar, a first one-way valve and a second one-way valve, the first sink groove is arranged on the inner arc surface of the arc-dividing seat, and a filter hole is arranged in the first sink groove; the second sink groove is arranged on the outer arc surface of the arc-sensing piece, and the second sink groove and the first sink groove are jointly surrounded to form a piston cavity; the piston bar is fixedly arranged on the outer arc surface of the arc-sensing piece and inserted in the piston cavity, the piston bar divides the piston cavity into a first sub-chamber and a second sub-chamber, and the filter hole is arranged in the first sub-chamber; the first one-way valve and the second one-way valve are both arranged on the outer arc surface of the arc-sensing piece, and the first one-way valve is used to connect the first sub-chamber and the second sub-chamber, and the opening direction is from the first sub-chamber to the second sub-chamber; the second one-way valve is used to connect the second sub-chamber and the area between the arc-sensing piece and the refrigeration auxiliary pipe, and the opening direction is from the second sub-chamber to the area between the arc-sensing piece and the refrigeration auxiliary pipe.

[0017] Furthermore, a second scraping portion is provided at the end of the arc sensing piece, and the second scraping portion is provided in a triangular structure with a tip facing outwards.

[0018] The beneficial effects of the present invention are: When in use, the azobisisobutyronitrile low-temperature crystal wall cleaning device provided by the present invention drives a scraping mechanism to slide back and forth along the extension direction of the refrigeration sub-pipe. During the sliding process of the scraping mechanism, the scraping mechanism simultaneously scrapes the crystals on the refrigeration sub-pipe. Therefore, on the one hand, the crystals on the refrigeration sub-pipe can be cleaned in time to avoid affecting the heat exchange efficiency between the refrigeration sub-pipe and the raw materials. On the other hand, the crystals on the refrigeration sub-pipe can be scraped without stopping the machine, which is beneficial to improving production efficiency.

[0019] Furthermore, by setting up an adjustment mechanism, when in use, the adjustment mechanism can adjust the diameter of the base tube according to the hardness of the crystals on the refrigeration sub-pipe, so that the harder the crystals on the refrigeration sub-pipe are, the closer the two arc seats are set to each other, thereby making the clamping force of the base tube on the refrigeration sub-pipe greater, thereby increasing the scraping force of the crystals on the refrigeration sub-pipe.

[0020] Furthermore, by setting up a pumping and flushing mechanism, when in use, the pumping and flushing mechanism can suck the liquid on the outside of the base tube into between the arc sensing plate and the refrigeration auxiliary pipe to flush the area between the arc sensing plate and the refrigeration auxiliary pipe, thereby reducing the grains stuck between the arc sensing plate and the refrigeration auxiliary pipe and affecting the crystal breaking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of the azobisisobutyronitrile low-temperature crystal wall cleaning device and the crystallization kettle during assembly provided by one embodiment of the present invention; Figure 2 A schematic diagram of the top view of the structure of the azobisisobutyronitrile low-temperature crystal wall cleaning device and the crystallization kettle during assembly provided by one embodiment of the present invention; Figure 3 for Figure 2 Middle AA section view; Figure 4 for Figure 3 A schematic diagram of the partially enlarged structure at B in the middle; Figure 5 A schematic diagram of the front view of the structure of the azobisisobutyronitrile low-temperature crystal wall cleaning device and the crystallization kettle during assembly provided by one embodiment of the present invention; Figure 6 for Figure 5 Middle CC section view; Figure 7 A schematic diagram of the three-dimensional structure of a device for cleaning azobisisobutyronitrile low-temperature crystals hanging on the wall provided by an embodiment of the present invention; Figure 8 A schematic cross-sectional view of a device for cleaning azobisisobutyronitrile low-temperature crystals hanging on the wall provided by an embodiment of the present invention; Fig. 9 A schematic diagram of the front view of the same side arc sub-seat, arc sensing sheet and extraction and cleaning mechanism of the azobisisobutyronitrile low-temperature crystal wall cleaning device provided by one embodiment of the present invention when assembled; Fig.10 A schematic diagram of the three-dimensional structure of the different side arc sub-seats and arc sensing pieces, the adjustment mechanism, and the extraction and cleaning mechanism of the azobisisobutyronitrile low-temperature crystal wall cleaning device provided by one embodiment of the present invention when assembled; Fig.11 A schematic diagram of the three-dimensional structure of an arc-dividing seat of a device for cleaning azobisisobutyronitrile low-temperature crystals hanging on the wall provided in one embodiment of the present invention.

[0022] in: 1. Crystallization kettle; 101. Feed inlet; 102. Discharge outlet; 103. Refrigerant inlet; 104. Refrigerant outlet; 11. Support frame; 12. Stirring shaft; 13. Stirring blade; 14. Telescopic rod; 141. Connecting rib; 15. Mounting frame; 151. Sub-frame; 1511. Crossbar; 2. Refrigeration pipe network; 21. Liquid inlet pipe; 22. Refrigeration auxiliary pipe; 23. Liquid outlet pipe; 3. scraping mechanism; 31. base pipe; 311. arc division seat; 3111. mounting rod; 3112. first scraping part; 312. connecting assembly; 4. Adjustment mechanism; 41. Sensing part; 411. Arc sensing piece; 4111. Second scraping part; 4112. Blocking piece; 412. Compression spring; 42. Adjustment part; 421. V-shaped hole; 422. Pushing column; 423. Wedge block; 5. Pumping and washing mechanism; 51. First trough; 511. Filter hole; 52. Second trough; 53. Piston chamber; 531. First sub-chamber; 532. Second sub-chamber; 54. Piston bar; 55. First one-way valve; 56. Second one-way valve. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned herein, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] like Figures 1 to 11As shown in the figure, the device for cleaning the crystallization on the refrigeration pipe network 2 in the crystallization kettle 1 provided by an embodiment of the present invention is used to clean the crystallization on the refrigeration pipe network 2 in the crystallization kettle 1. The refrigeration pipe network 2 includes a refrigeration sub-pipe 22, and the refrigeration sub-pipe 22 is used to absorb the heat of the raw material.

[0027] Specifically in this embodiment, as Figure 1 shown, the crystallization kettle 1 is set as a tank-like structure and is vertically arranged during use; in order to enable the crystallization kettle 1 to be vertically arranged, a plurality of support frames 11 are arranged on the outer peripheral wall of the crystallization kettle 1, and the support frames 11 are used to connect to an external frame; in order to facilitate the addition of raw materials into the crystallization kettle 1, a feed inlet 101 is arranged at the top of the crystallization kettle 1, and in order to facilitate the discharge of the crystallization, a discharge outlet 102 is arranged at the bottom of the crystallization kettle 1.

[0028] Exemplarily, the number of the support frames 11 can be set to four and are evenly arranged along the circumferential direction.

[0029] More specifically, in order to facilitate the improvement of the crystallization efficiency of the raw material, a stirring shaft 12 is coaxially inserted inside the crystallization kettle 1, and stirring blades 13 are sleeved on the stirring shaft 12. The stirring shaft 12 can rotate self - sufficiently to stir the raw material through the stirring blades 13.

[0030] As Figure 3 shown, the refrigeration sub - pipe 22 is vertically inserted inside the crystallization kettle 1 during installation; in order to facilitate the supply of refrigerant to the refrigeration sub - pipe 22, the refrigeration pipe network 2 is also set to include a liquid inlet main pipe 21. The liquid inlet main pipe 21 is set as an annular structure and is coaxially inserted inside the crystallization kettle 1 during installation and is arranged near the top. A refrigerant inlet 103 is also arranged at the top of the crystallization kettle 1, and the refrigerant inlet 103 is communicated with the liquid inlet main pipe 21. The top end of the refrigeration sub - pipe 22 is communicated with the liquid inlet main pipe 21; in order to receive the refrigerant after absorbing heat in the refrigeration sub - pipe 22, the refrigeration pipe network 2 is also set to include a liquid outlet main pipe 23. The liquid outlet main pipe 23 is set as an annular structure and is coaxially inserted inside the crystallization kettle 1 during installation and is arranged near the bottom. A refrigerant outlet 104 is also arranged at the bottom of the crystallization kettle 1, and the refrigerant outlet 104 is communicated with the liquid outlet main pipe 23. The bottom end of the refrigeration sub - pipe 22 is communicated with the liquid outlet main pipe 23.

[0031] Exemplarily, the number of the refrigeration sub - pipes 22 can be set to multiple groups, and taking each group including three refrigeration sub - pipes 22 as an example, as Figure 3 shown, the three refrigeration sub - pipes 22 in the same group together form a horizontally arranged "day" - shaped structure, and different groups of refrigeration sub - pipes 22 are arranged at equal intervals along the circumferential direction between the liquid inlet main pipe 21 and the liquid outlet main pipe 23.

[0032] The device for cleaning the crystallization of azodiisobutyronitrile at low temperature is set to include a scraping mechanism 3. The scraping mechanism 3 is arranged on the refrigeration sub - pipe 22 and can reciprocally slide along the extending direction of the refrigeration sub - pipe 22 to scrape the crystallization on the refrigeration sub - pipe 22.

[0033] Specifically in this embodiment, the number of scraping mechanisms 3 is equal to the number of refrigeration auxiliary pipes 22, and they are arranged one by one; in order to facilitate the provision of a driving force for the scraping mechanism 3 to slide back and forth along the extension direction of the refrigeration auxiliary pipe 22, a mounting frame 15 is also inserted inside the crystallization kettle 1, such as Figure 6 As shown, the mounting frame 15 is configured as an annular structure and is composed of a plurality of sub-frames 151, the plurality of sub-frames 151 are arranged at intervals along the circumferential direction, the sub-frames 151 are configured as an arc structure, the mounting frame 15 is coaxially arranged with the crystallization kettle 1 during installation, each sub-frame 151 has a plurality of cross bars 1511, the cross bars 1511 are horizontally arranged and extend in a direction perpendicular to the axis of the crystallization kettle 1, a group of refrigeration auxiliary pipes 22 are arranged between adjacent cross bars 1511 and on the outside of the outermost cross bars 1511, the cross bars 1511 cooperate with the stoppers of the scraping mechanism 3, so that the mounting frame 15 can synchronously drive the scraping mechanism 3 to move in the vertical direction; as shown Figure 3 As shown, the same number of telescopic rods 14 as the number of sub-racks 151 are inserted inside the crystallization kettle 1, and the telescopic rods 14 extend in a direction parallel to the axis of the crystallization kettle 1, and the top ends penetrate the top of the crystallization kettle 1, and the bottom ends are fixedly connected to the sub-racks 151. The telescopic rods 14 can be telescoped along their own extension direction, and the power for telescopic expansion is provided by hydraulic pressure.

[0034] Exemplarily, the mounting frame 15 may be configured to be composed of four sub-frames 151; accordingly, the number of telescopic rods 14 is set to four and evenly arranged along the circumferential direction.

[0035] More specifically, in order to improve the connection strength between the telescopic rod 14 and the sub-frame 151, as shown in FIG. Figure 3 As shown, two connecting ribs 141 are provided on the bottom peripheral wall of the telescopic rod 14 , and the two connecting ribs 141 together form an inverted V-shaped structure, and one end away from the telescopic rod 14 is fixedly connected to the sub-frame 151 .

[0036] When in use, the telescopic rod 14 is extended and retracted by hydraulic drive; during the extension and retraction of the telescopic rod 14, the telescopic rod 14 synchronously drives the mounting frame 15 to move back and forth in the vertical direction, and the mounting frame 15 drives the scraping mechanism 3 to slide back and forth along the extension direction of the refrigeration sub-pipe 22 through the cross bar 1511. During the sliding process of the scraping mechanism 3, the scraping mechanism 3 synchronously scrapes the crystals on the refrigeration sub-pipe 22. On the one hand, the crystals on the refrigeration sub-pipe 22 can be cleaned up in time to avoid affecting the heat exchange efficiency between the refrigeration sub-pipe 22 and the raw materials. On the other hand, the crystals on the refrigeration sub-pipe 22 can be scraped off without stopping the machine, which is beneficial to improving production efficiency.

[0037] In some embodiments, the scraping mechanism 3 is configured to include a base tube 31, which is sleeved on the refrigeration auxiliary pipe 22, and two first scraping parts 3112 are symmetrically arranged at the end of the base tube 31. The first scraping parts 3112 are configured to be a triangular structure with the tip facing outward.

[0038] Specifically in this embodiment, Figure 7 As shown, the base tube 31 is configured as an I-shaped structure, such as Figure 4 As shown, the base pipe 31 is clamped on the outside of the cross bar 1511 during installation to form a stopper fit with the cross bar 1511; Fig.11 As shown, the first scraping portion 3112 is configured as an arc-shaped triangular plate structure, and is coaxially and fixedly disposed on the top of the base tube 31 during installation, and the tip of the first scraping portion 3112 is disposed upward.

[0039] During use, the base tube 31 synchronously moves along the vertical direction following the mounting frame 15 ; and when the base tube 31 moves upward, the crystals on the refrigeration sub-tube 22 are gradually punctured and separated from the refrigeration sub-tube 22 by the tip of the first scraping portion 3112 .

[0040] In a further embodiment, in order to further improve the scraping effect of the scraping mechanism 3, the base tube 31 is configured to include two symmetrically arranged arc-divided seats 311, two first scraping parts 3112 and the two arc-divided seats 311 are correspondingly arranged, and the two arc-divided seats 311 can move relative to each other in the radial direction to change the diameter of the base tube 31; the azobisisobutyronitrile low-temperature crystal wall cleaning device is configured to also include an adjusting mechanism 4, and the adjusting mechanism 4 is configured to be able to adjust the diameter of the base tube 31 according to the hardness of the crystals on the refrigeration auxiliary pipe 22, so that the two arc-divided seats 311 are arranged closer to each other when the hardness of the crystals on the refrigeration auxiliary pipe 22 is greater.

[0041] Specifically in this embodiment, Fig.10 As shown, the arc-dividing seat 311 is configured as a horizontal "П"-shaped structure, and the opening is configured horizontally outward; in order to facilitate the connection of the two arc-dividing seats 311, the scraping mechanism 3 is configured to also include four connecting components 312, such as Figure 7 As shown, the four connecting components 312 are divided into two groups. The two groups of connecting components 312 are arranged at intervals along the axial direction of the base pipe 31. The two connecting components 312 in the same group are arranged at an interval of 180 degrees along the circumferential direction. The two connecting components 312 on the same side of different groups are correspondingly arranged along the axial direction of the base pipe 31. Each connecting component 312 can be configured to include a bolt and a nut. When installed, the bolt passes through the two arc seats 311 at the same time. The nut is installed with a threaded sleeve on the bolt, and the nut is not completely tightened, so that the two arc seats 311 can move relatively in the radial direction.

[0042] When in use, the adjustment mechanism 4 can adjust the diameter of the base tube 31 according to the hardness of the crystals on the refrigeration sub-pipe 22, so that the two arc seats 311 are set closer to each other when the hardness of the crystals on the refrigeration sub-pipe 22 is greater, thereby making the clamping force of the base tube 31 on the refrigeration sub-pipe 22 greater, thereby increasing the force for scraping off the crystals on the refrigeration sub-pipe 22.

[0043] In a further embodiment, the adjustment mechanism 4 is configured to include a sensing part 41 and an adjustment part 42, the sensing part 41 is configured to sense the hardness of the crystals on the refrigeration sub-pipe 22; the adjustment part 42 is configured to adjust the distance between the two arc seats 311 according to the hardness of the crystals on the refrigeration sub-pipe 22 sensed by the sensing part 41.

[0044] During use, the base tube 31 synchronously follows the mounting frame 15 to move in the vertical direction; and when the base tube 31 moves upward, the sensing part 41 first senses the hardness of the crystals on the refrigeration sub-pipe 22, and the adjusting part 42 then adjusts the distance between the two arc seats 311 according to the hardness of the crystals on the refrigeration sub-pipe 22 sensed by the sensing part 41, so that the two arc seats 311 are arranged closer to each other when the hardness of the crystals on the refrigeration sub-pipe 22 is greater, thereby making the clamping force of the base tube 31 on the refrigeration sub-pipe 22 greater, thereby increasing the force for scraping off the crystals on the refrigeration sub-pipe 22.

[0045] In a further embodiment, the sensing portion 41 is configured to include two arc sensing pieces 411, which are symmetrically inserted into the base tube 31, and are arranged one-to-one corresponding to the arc division seats 311, and can elastically slide along the axial direction of the base tube 31; the outer end of the arc sensing piece 411 exceeds the tip of the first scraping portion 3112.

[0046] Specifically in this embodiment, Fig. 9 As shown, the shape of the arc sensing sheet 411 is set to be an inverted T-shape, and is set to be an arc-shaped sheet structure; in order to facilitate the elastic sliding of the arc sensing sheet 411, as shown Figure 7 As shown, a mounting platform is vertically and fixedly arranged near the top on the outer arc surface of each arc sensing piece 411, and a mounting rod 3111 is vertically and fixedly arranged on the top of each arc division seat 311. The mounting rod 3111 is arranged as an "I"-shaped round rod structure, and the top of the mounting rod 3111 passes through the mounting platform. The sensing part 41 is arranged to also include two compression springs 412. The compression springs 412 are sleeved on the mounting rods 3111 one by one during installation, and the top ends abut against the bottom of the mounting platform, and the bottom ends abut against the bottom of the mounting rod 3111. Under the action of the compression springs 412, the arc sensing piece 411 has a tendency to move upward.

[0047] During use, the base tube 31 synchronously follows the mounting frame 15 to move in the vertical direction; and when the base tube 31 moves upward, since the outer end of the arc sensing piece 411 exceeds the tip of the first scraping portion 3112, the arc sensing piece 411 can first contact the crystals on the refrigeration sub-pipe 22, and under the push of the crystals on the refrigeration sub-pipe 22, the arc sensing piece 411 can move downward relative to the arc seat 311, and the compression spring 412 is compressed. The greater the hardness of the crystals on the refrigeration sub-pipe 22, the greater the distance the arc sensing piece 411 moves downward, thereby being able to sense the hardness of the crystals on the refrigeration sub-pipe 22.

[0048] After the first scraping portion 3112 removes the crystals on the refrigeration auxiliary pipe 22 , the compression spring 412 is released to drive the arc sensing piece 411 to move upward to the initial position relative to the arc dividing seat 311 .

[0049] In a further embodiment, the adjusting portion 42 is configured to include two V-shaped holes 421, four push columns 422 and four wedge blocks 423. The two V-shaped holes 421 are symmetrically opened at the ends of the base tube 31 and are arranged one-to-one with the first scraping portion 3112. The large end of the V-shaped hole 421 is arranged outward and passes through the tip of the first scraping portion 3112; the four push columns 422 are divided into two groups, and the two push columns 422 of the same group are symmetrically arranged on the outer arc surface of the arc sensing piece 411; the four wedge blocks 423 are divided into two groups, and the two wedge blocks 423 of the same group are symmetrically arranged on the inner arc surface of the arc division seat 311 and are located on both sides of the V-shaped hole 421. The wedge surfaces of the push columns 422 and the wedge blocks 423 form a guiding fit, and when the push columns 422 move inward, the wedge blocks 423 have a tendency to move in a direction close to the V-shaped hole 421.

[0050] Specifically in this embodiment, Fig.10 As shown, the push column 422 is arranged on the outer arc surface of the small end of the arc sensing piece 411 during installation; Fig.11 As shown, the wedge block 423 is arranged as an arc structure, and the projection shape on the vertical plane is a right-angled trapezoid, and the short base and the long base of the right-angled trapezoid are both arranged horizontally, the hypotenuse is arranged away from the V-shaped hole 421, and the side wall surface where the hypotenuse is located is a wedge surface.

[0051] During use, when the arc sensing piece 411 moves downward relative to the arc sub-seat 311 under the push of the crystallized matter on the refrigeration sub-pipe 22, the two wedge blocks 423 of the same group can approach each other under the pressure of the two pushing columns 422 of the same group, so that the angle of the V-shaped hole 421 becomes smaller, and then the two arc sub-seats 311 can approach each other and the diameter of the base tube 31 becomes smaller, so as to clamp the refrigeration sub-pipe 22, so that when the base tube 31 moves, the force of scraping the crystallized matter on the refrigeration sub-pipe 22 is increased; and when the hardness of the crystallized matter on the refrigeration sub-pipe 22 is greater, the distance that the arc sensing piece 411 moves downward is greater, so that the angle of the V-shaped hole 421 is smaller, and then the distance between the two arc sub-seats 311 is closer, the diameter of the base tube 31 is smaller, and the clamping force on the refrigeration sub-pipe 22 is greater, so that when the base tube 31 moves, the force of scraping the crystallized matter on the refrigeration sub-pipe 22 is greater, thereby improving the scraping effect.

[0052] In a further embodiment, in order to prevent the arc-dividing seat 311 from being broken due to deformation of the V-shaped hole 421 , the small end of the V-shaped hole 421 is configured as a circular structure.

[0053] During use, when the two wedge blocks 423 of the same group approach each other under the pressure of the two push pins 422 of the same group, the circular structure of the small end of the V-shaped hole 421 can effectively reduce stress concentration, thereby avoiding the arc seat 311 from breaking.

[0054] In other embodiments, in order to reduce the grains intercalated between the arc sensing piece 411 and the refrigeration auxiliary pipe 22, the azobisisobutyronitrile low-temperature crystallization wall cleaning device is configured to also include a pumping mechanism 5, and the pumping mechanism 5 is configured to be able to suck the liquid on the outside of the base tube 31 into between the arc sensing piece 411 and the refrigeration auxiliary pipe 22 to flush the area between the arc sensing piece 411 and the refrigeration auxiliary pipe 22.

[0055] When in use, the pumping mechanism 5 can suck the liquid on the outside of the base tube 31 into between the arc sensing plate 411 and the refrigeration auxiliary pipe 22 to flush the area between the arc sensing plate 411 and the refrigeration auxiliary pipe 22, thereby reducing the grains stuck between the arc sensing plate 411 and the refrigeration auxiliary pipe 22 and affecting the crystal breaking effect.

[0056] In a further embodiment, the extraction and washing mechanism 5 is configured to include two flushing components, and the two flushing components are correspondingly arranged with the arc sensing piece 411 and the arc division seat 311 on the same side; the flushing component is configured to include a first sink 51, a second sink 52, a piston bar 54, a first one-way valve 55 and a second one-way valve 56, the first sink 51 is arranged on the inner arc surface of the arc division seat 311, and a filter hole 511 is arranged in the first sink 51; the second sink 52 is arranged on the outer arc surface of the arc sensing piece 411, and the second sink 52 and the first sink 51 are jointly surrounded to form a piston cavity 53; the piston bar 54 is fixedly arranged on the outer arc surface of the arc sensing piece 411, and the piston bar 54 is inserted into the first one-way valve 55. Installed in the piston chamber 53, the piston bar 54 divides the piston chamber 53 into a first sub-chamber 531 and a second sub-chamber 532, and the filter hole 511 is arranged in the first sub-chamber 531; the first one-way valve 55 and the second one-way valve 56 are both arranged on the outer arc surface of the arc sensing plate 411, and the first one-way valve 55 is used to connect the first sub-chamber 531 and the second sub-chamber 532, and the opening direction is from the first sub-chamber 531 to the second sub-chamber 532; the second one-way valve 56 is used to connect the second sub-chamber 532 and the area between the arc sensing plate 411 and the refrigeration auxiliary pipe 22, and the opening direction is from the second sub-chamber 532 to the area between the arc sensing plate 411 and the refrigeration auxiliary pipe 22.

[0057] Specifically in this embodiment, Fig.11 As shown, the first sink 51 is set in a "cross" shape and passes through the top end surface of the first scraping portion 3112 and the bottom end surface of the arc division seat 311; Fig.10 As shown, the second sink groove 52 covers the entire outer arc surface of the large end of the arc sensing piece 411, the piston strip 54 is set as an arc-shaped strip structure and is arranged horizontally, the number of piston strips 54 is set to two, and they are symmetrically arranged on the outer arc surface of the large end of the arc sensing piece 411 and arranged at intervals along the circumferential direction, the first one-way valve 55 is set on the outer arc surface of the large end of the arc sensing piece 411, and is located between the two piston strips 54, a connecting hole is opened on the outer arc surface of the large end of the arc sensing piece 411, and the second one-way valve 56 is inserted in the connecting hole; a blocking piece 4112 is fixedly arranged at the bottom of the arc sensing piece 411, and the blocking piece 4112 makes the arc sensing piece 411 form a "cross" structure as a whole, the blocking piece 4112 is set as an "I"-shaped arc structure, and the left and right side walls of the blocking piece 4112 are set as "eight" shapes, and the blocking piece 4112 is inserted in the first sink groove 51 when in use, so as to control the bottom opening of the first sink groove 51 to be opened or closed; as shown in FIG. Figure 8 As shown, the piston chamber 53 is configured as a tile-like structure, and the area of ​​the piston chamber 53 above the piston bar 54 is a first sub-chamber 531 , and the area of ​​the piston chamber 53 below the piston bar 54 is a second sub-chamber 532 .

[0058] During use, when the arc sensing piece 411 moves downward relative to the arc sub-seat 311 under the push of the crystals on the refrigeration auxiliary pipe 22, the volume of the first sub-chamber 531 increases and the pressure decreases, so that the liquid can pass through the filter hole 511 into the first sub-chamber 531, and the volume of the second sub-chamber 532 decreases and the pressure increases. The first one-way valve 55 is in a closed state. Under the action of the pressure difference, the second one-way valve 56 is in an open state, so that the liquid in the second sub-chamber 532 can pass through the connecting hole into between the arc sensing piece 411 and the refrigeration auxiliary pipe 22 to flush the crystals mixed between the arc sensing piece 411 and the refrigeration auxiliary pipe 22, and when the blocking piece 4112 When it moves to open the bottom opening of the first trough 51, the liquid between the arc sensing piece 411 and the refrigeration auxiliary pipe 22 can carry the grains and flow out of the area between the arc sensing piece 411 and the refrigeration auxiliary pipe 22; when the arc sensing piece 411 moves upward relative to the arc sub-seat 311 under the action of the compression spring 412, the volume of the first sub-chamber 531 decreases and the pressure increases, and the volume of the second sub-chamber 532 increases and the pressure decreases. Under the action of the pressure difference, the first one-way valve 55 is in an open state, so that the liquid can enter the second sub-chamber 532 from the first sub-chamber 531, and the second one-way valve 56 is in a closed state to prevent the liquid between the arc sensing piece 411 and the refrigeration auxiliary pipe 22 from flowing back.

[0059] In other embodiments, in order to further improve the sensing sensitivity of the arc sensing piece 411 , a second scraping portion 4111 is provided at the end of the arc sensing piece 411 . The second scraping portion 4111 is provided in a triangular structure with the tip facing outward.

[0060] Specifically in this embodiment, Figure 7 As shown, the second scraping portion 4111 is configured as an arc-shaped triangular plate structure, and is coaxially and fixedly disposed on the top of the arc-sensing plate 411 during installation, and the tip of the second scraping portion 4111 is disposed upward and exceeds the tip of the first scraping portion 3112 .

[0061] When in use, since the tip of the second scraper part 4111 exceeds the tip of the first scraper part 3112, the tip of the second scraper part 4111 can first contact the crystals on the refrigeration sub-pipe 22. Since the tip of the second scraper part 4111 has a very small surface area, when the tip of the second scraper part 4111 contacts the crystals on the refrigeration sub-pipe 22, the pressure per unit area of ​​the contact part between the second scraper part 4111 and the crystals on the refrigeration sub-pipe 22 is greater, thereby making the second scraper part 4111 more easily pushed by the crystals on the refrigeration sub-pipe 22.

[0062] In other embodiments, Figure 6As shown, the liquid outlet main pipe 23 can also be set to a regular octagonal structure, then the mounting frame 15 is set to a regular octagonal structure, and the number of sub-frames 151 can be set to four, and all are set to a V-shaped structure; correspondingly, the liquid inlet main pipe 21 can also be set to a regular octagonal structure, and each side of the liquid inlet main pipe 21 can be provided with ten groups of refrigeration sub-pipes 22, each group includes three refrigeration sub-pipes 22, a total of thirty refrigeration sub-pipes 22, the two main sides of the sub-frame 151 are placed on the outside of the refrigeration sub-pipe 22, the two main sides are connected by five reinforcing ribs, the middle rib is made of double white steel channel steel, and a fixing sleeve is provided at the angle between the two inner sides for fixing the telescopic rod 14.

[0063] In other embodiments, the material of the crystallization kettle 1 can be set to 304 stainless steel, and the upper head and the tank body are set separately and hingedly connected by flange bolts. The lower part of the tank body is an inverted cone structure to facilitate discharge.

[0064] In other embodiments, the base tube 31 can also be made of 304 material and consists of two parts, and is hinged and sleeved on the outside of the refrigeration auxiliary pipe 22 with bolts, and a 1mm gap is left between the base tube 31 and the refrigeration auxiliary pipe 22; the upper end of the base tube 31 is triangular, and a baffle is provided above and below the 70mm straight section of the base tube 31 by breaking the crystalline structure adhered to the tube wall, and the distance between the baffles is 50mm. The inner diameter of the baffle is welded to the base tube 31 as a whole, and the outer diameter is larger than the outer diameter of the base tube 31. 40mm; the cross bar 1511 is set to 40×3.5mm. Two adjacent cross bars 1511 clamp the three base tubes 31 in the middle and drive the three base tubes 31 to move at the same time. The two ends of the cross bar 1511 are inserted into the reinforcing plate on the upper part of the main side of the sub-frame 151. The reinforcing plate is an 80×6mm slat, and a 4×40.5mm long strip hole is opened in the middle according to the spacing of the cross bars 1511. The cross bars 1511 that fix the base tube are inserted into the long strip holes on the reinforcing plate and fixed.

[0065] In other embodiments, four holes are opened on the top of the crystallization kettle 1, each of which is welded with a flange, and the cylinder parts of the hydraulic cylinder that drives the telescopic rod 14 to move are fixed on the flanges. The center of the hole is perpendicular to the center of the fixed sleeve reserved on the sub-frame 151. The cylinder rod is extended and passed through the fixed sleeve and then connected and fixed. When the hydraulic cylinder is lifted, the sub-frame 151 will be driven to lift, and the base pipe 31 on the sub-frame 151 will rise or fall following the movement of the hydraulic cylinder.

[0066] In a further embodiment, four hydraulic cylinders are installed in the four holes, the four hydraulic cylinders are controlled by a hydraulic station, and each group of solenoid valves controls the lifting and lowering of one hydraulic cylinder.

[0067] Specifically in this embodiment, the start or stop of the hydraulic station is controlled by two control systems: First, the switch on the distribution box is manually controlled to control the start and stop of the hydraulic station during debugging and maintenance; then the distribution box and the PLC switch control box are jointly controlled for normal automatic operation control. When the PLC start switch is turned on, the hydraulic motor starts and delays according to the set time. After the delay ends, there is a few seconds of interval time. After the countdown ends, the first group of hydraulic cylinder lifting signals start. At this time, the first group of hydraulic cylinders begins to lift. When the hydraulic cylinder is lifted to the top, the delay ends and the interval time counts. After the countdown time is up, it jumps to the next signal, and the hydraulic cylinder begins to descend and delays. Repeat the above actions, and the signal jumps backward. When the fourth group of hydraulic cylinders is completed, it will jump to the last signal. This signal is the motor operation shutdown signal. At this time, the motor stops running. This operation is over. According to the needs, the next automatic operation time can be set between 60 seconds and 10,000 seconds. After the time is reached, the operation mode is automatically repeated until the crystallization process is completed.

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A device for cleaning the wall of azobisisobutyronitrile low-temperature crystals, characterized in that: Used to clean crystals on the refrigeration network in the crystallization kettle, the refrigeration network includes a refrigeration sub-pipe, and the refrigeration sub-pipe is used to absorb the heat of the raw materials; the azobisisobutyronitrile low-temperature crystal wall cleaning device includes a scraping mechanism, which is arranged on the refrigeration sub-pipe and can slide back and forth along the extension direction of the refrigeration sub-pipe to scrape off the crystals on the refrigeration sub-pipe.

2. The azobisisobutyronitrile low-temperature crystal wall cleaning device according to claim 1, characterized in that: The scraping mechanism comprises a base tube, the base tube is sleeved on the refrigeration auxiliary tube, two first scraping parts are symmetrically arranged at the end of the base tube, and the first scraping parts are arranged in a triangular structure with the tip facing outwards.

3. The azobisisobutyronitrile low temperature crystal wall cleaning device according to claim 2, characterized in that: The base tube includes two symmetrically arranged arc-minute seats, the two first scraping parts and the two arc-minute seats are arranged correspondingly, and the two arc-minute seats can move relative to each other in the radial direction to change the diameter of the base tube; the azobisisobutyronitrile low-temperature crystal wall cleaning device also includes an adjustment mechanism, and the adjustment mechanism is configured to adjust the diameter of the base tube according to the hardness of the crystals on the refrigeration auxiliary pipe, so that the two arc-minute seats are arranged closer to each other when the hardness of the crystals on the refrigeration auxiliary pipe is greater.

4. The azobisisobutyronitrile low-temperature crystal wall cleaning device according to claim 3, characterized in that: The adjustment mechanism includes a sensing part and an adjustment part, wherein the sensing part is configured to sense the hardness of the crystals on the refrigeration sub-pipe; and the adjustment part is configured to adjust the distance between the two arc seats according to the hardness of the crystals on the refrigeration sub-pipe sensed by the sensing part.

5. The azobisisobutyronitrile low-temperature crystal wall cleaning device according to claim 4, characterized in that: The sensing part includes two arc sensing pieces, which are symmetrically inserted into the base tube and arranged one-to-one with the arc seats and can slide elastically along the axial direction of the base tube; the outer end of the arc sensing piece exceeds the tip of the first scraping part.

6. The azobisisobutyronitrile low-temperature crystal wall cleaning device according to claim 5, characterized in that: The adjusting portion includes two V-shaped holes, four push columns and four wedge blocks. The two V-shaped holes are symmetrically opened at the ends of the base tube and are arranged one-to-one with the first scraping portion. The large end of the V-shaped hole is arranged outward and passes through the tip of the first scraping portion. The four push columns are divided into two groups. The two push columns in the same group are symmetrically arranged on the outer arc surface of the arc sensing piece. The four wedge blocks are divided into two groups. The two wedge blocks in the same group are symmetrically arranged on the inner arc surface of the arc seat and are located on both sides of the V-shaped hole. The push columns and the wedge surfaces of the wedge blocks form a guiding fit, and when the push columns move inward, the wedge blocks have a tendency to move in the direction close to the V-shaped hole.

7. The azobisisobutyronitrile low-temperature crystal wall cleaning device according to claim 6, characterized in that: The small end of the V-shaped hole is configured as a circular structure.

8. The azobisisobutyronitrile low-temperature crystal wall cleaning device according to claim 5, characterized in that: The azobisisobutyronitrile low-temperature crystal wall cleaning device also includes a pumping mechanism, which is configured to suck the liquid outside the base tube into between the arc sensing plate and the refrigeration auxiliary pipe to flush the area between the arc sensing plate and the refrigeration auxiliary pipe.

9. The azobisisobutyronitrile low-temperature crystal wall cleaning device according to claim 8, characterized in that: The pumping mechanism includes two flushing components, and the two flushing components are arranged corresponding to the arc-sensing piece and the arc-dividing seat on the same side; the flushing component includes a first sink groove, a second sink groove, a piston bar, a first one-way valve and a second one-way valve, the first sink groove is arranged on the inner arc surface of the arc-dividing seat, and a filter hole is arranged in the first sink groove; the second sink groove is arranged on the outer arc surface of the arc-sensing piece, and the second sink groove and the first sink groove are jointly surrounded to form a piston cavity; the piston bar is fixedly arranged on the outer arc surface of the arc-sensing piece and inserted in the piston cavity, the piston bar divides the piston cavity into a first sub-chamber and a second sub-chamber, and the filter hole is arranged in the first sub-chamber; the first one-way valve and the second one-way valve are both arranged on the outer arc surface of the arc-sensing piece, and the first one-way valve is used to connect the first sub-chamber and the second sub-chamber, and the opening direction is from the first sub-chamber to the second sub-chamber; the second one-way valve is used to connect the second sub-chamber and the area between the arc-sensing piece and the refrigeration auxiliary pipe, and the opening direction is from the second sub-chamber to the area between the arc-sensing piece and the refrigeration auxiliary pipe.

10. The device for cleaning the wall of azobisisobutyronitrile low-temperature crystals according to claim 5, characterized in that: A second scraping portion is disposed at the end of the arc sensing piece. The second scraping portion is configured as a triangular structure with a tip facing outward.

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