A spray device and boiling granulation dryer

Abstract

The present invention discloses a spray device and a boiling granulation dryer, which relate to the field of boiling granulation dryers, including a pipeline and a spray chamber, wherein the end of the pipeline is fixedly connected to the spray chamber, a distribution plate is arranged at the bottom of the spray chamber, and a blocking block and a lever are arranged on the distribution plate. A spray device is designed to accurately control the liquid spray interval and droplet volume, a distribution plate for controlling the spray range is arranged in the spray chamber, a blocking block for blocking the nozzle is arranged through the distribution plate, and a lever for driving the blocking block to periodically advance is arranged to achieve uniform spraying of liquid materials in the spray chamber, and the volume and spray interval of the sprayed droplets are controlled by controlling the advance distance and advance time of the blocking block, so as to ensure that the droplets fall into the granulation chamber and are mixed with the bonding mother seed powder for uniform granulation, and the uniform granulation is also beneficial to the subsequent drying of the granulation, avoiding spending excessive time to ensure the drying of the granulation, and is beneficial to the control of the granulation quality.

Description

Technical Field

[0001] The invention relates to a spray device, in particular to a spray device and a boiling granulation dryer. Background Art

[0002] Fluidized bed drying granulator is a new type of drying and granulating process equipment that combines fluidized bed technology and spray granulation technology. It integrates mixing, drying, spray granulation and coating functions. The liquid material is atomized and sprayed into the granulation cavity through a spray gun. The atomized droplets are mixed with the mother seed powder in the fluid bed granulation chamber and bonded into granules. At the same time, the granules are dried by hot air along with the boiling raw materials.

[0003] The existing spraying device sprays the liquid as a whole within a certain range through the nozzle, but the existing nozzle has poor control over the spraying of liquid materials, and the droplets of atomized effect fail to fall into the fluid bed granulation chamber and adhere to the solid materials to form a granulation effect, that is, to be dried by hot air. If the sprayed droplets are too large, it will affect the drying of the granulation. At the same time, it is impossible to control the fusion of dense atomized droplets, which greatly limits the efficiency of spray granulation. At the same time, in order to ensure the drying quality of the granulation, a longer particle drying process is required, which causes a large amount of energy loss and also affects the granulation quality.

[0004] Therefore, those skilled in the art proposed a spray device and a boiling granulation dryer, and improved the structure of the spray device in the boiling granulation dryer to facilitate the control of the spray droplets and facilitate production. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a spray device and a boiling granulation dryer. The spray device is designed to facilitate control of the size of droplets during liquid spraying, and can more accurately control the volume of the sprayed droplets, thereby avoiding the problem that the fine droplets fail to fall into the granulation chamber and complete drying, and fail to mix and bond with the mother seed powder in the granulation chamber for granulation. In addition, after effectively controlling the volume of the sprayed droplets, it is more convenient to avoid the uncertainty caused by disordered fusion between dense droplets, facilitate unified drying of granulations, and benefit product quality control.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an injection device, including a pipeline and a peristaltic pump, one end of the pipeline is fixedly connected to the peristaltic pump, and the peristaltic pump is used to transport liquid to the other end of the pipeline for injection.

[0007] The end of the pipeline away from the peristaltic pump is fixedly connected to the injection chamber, and the inner bottom of the injection chamber is provided with a distribution plate. The liquid material is transported to the injection chamber through the pipeline for pressurization, and then the liquid material is evenly distributed and sprayed through the distribution plate. Different from the existing spraying device that directly uses a narrow outlet to atomize and spray the pressurized liquid, the volume of the sprayed droplets is easier to control, and the spray range and sequence of the droplets can be conveniently controlled, so as to avoid the fusion of disorderly sprayed droplets to form droplets with a large volume span that affect subsequent work.

[0008] A nozzle is penetrated through the side wall of the distribution plate, and a sealing block is arranged on the upper surface of the distribution plate and located inside the nozzle. A return spring is arranged tightly on one side of the sealing block. The sealing block blocks the nozzle under the pressing action of the return spring to prevent the liquid in the injection cavity from being continuously sprayed from the nozzle. The volume and interval period of the sprayed droplets are controlled by controlling the advancement of the sealing block.

[0009] A lever is provided above the distribution plate corresponding to the rotation of the blocking block. The lever periodically rotates to drive the blocking block to advance and expose the nozzle for intermittent liquid injection. The lever triggers the blocking block to advance and expose the nozzle. Only then can the liquid in the injection cavity be ejected out from the nozzle. The volume and interval time of the injected liquid are controlled by controlling the advance interval of the blocking block, thereby ensuring the volume of the injected droplets and avoiding the uncertainty caused by the disordered fusion of dense droplets.

[0010] Preferably, the bottom inner wall of the injection chamber is fixedly connected with a retaining ring corresponding to the distribution plate, and the bottom of the injection chamber is threadedly sleeved with a mounting sleeve corresponding to the distribution plate. The distribution plate is tightly installed at the bottom of the injection chamber by threadedly sleeved on the outer side of the bottom of the injection chamber. The injection chamber and the inner side of the mounting sleeve are both provided with sealing rings. The sealing ring is provided to ensure the sealing of the injection chamber to avoid leakage and the formation of droplets of different volumes from the injection droplets, which may affect subsequent processes.

[0011] Preferably, a driving shaft is arranged in the middle position of the top wall in the injection chamber, and the driving shaft is driven to rotate by a driving control unit. A plurality of the levers are fixed in a circular shape and equidistantly on the side surface of the driving shaft close to one end of the distribution plate. The driving control unit drives the driving shaft to rotate to realize the rotation of a plurality of circularly equidistantly distributed levers on its side surface. The rotation period of the driving shaft and the setting density of the levers determine the volume and interval of droplet injection by the device.

[0012] Preferably, the upper surface of the distribution plate is fixedly connected with a hinge seat corresponding to the rotation direction of the lever, and a hinge rod is hingedly provided on the inner side of the hinge seat. The blocking block is fixed on the side of the hinge rod corresponding to the nozzle position, so that the hinge rod can be pushed during the rotation of the lever, and the blocking block is pushed forward by touching the lever.

[0013] The nozzle and the sealing block are provided with sealing rubber pads on the side, and the return spring is fixedly connected to the side of the hinge rod away from the end of the sealing block. The return spring presses against the one end of the hinge rod to ensure the sealing effect of the sealing block arranged at the other end of the hinge rod on the nozzle and the resetting effect of the hinge rod. After the hinge rod is separated from the action of the lever, the sealing block quickly resets to form a block for the nozzle. Sealing rubber pads with good elasticity and sealing properties are provided on the inner side of the nozzle and the side of the sealing block, which is beneficial to the sealing block to seal the nozzle tightly.

[0014] Preferably, a sleeve is fixedly connected to the upper surface of the distribution plate corresponding to the return spring, and a slider is slidably arranged on the inner side of the sleeve. The return spring extends to the inner side of the sleeve away from one end of the hinge rod and is fixedly connected to the slider. The sleeve provides an installation limit for the return spring to prevent the limit spring from slipping and affecting the support for the hinge rod. A slider is slidably arranged on the inner side of the sleeve, and the clamping force of the return spring on the hinge rod can be adjusted by adjusting the position of the slider.

[0015] Preferably, an adjusting bolt penetrates and is rotatably connected to the lower surface of the distribution plate, and the adjusting bolt extends into the inner side of the sleeve and penetrates the slider. The adjusting bolt is threadedly connected to the slider, and the slider is driven to advance inside the sleeve through the threaded connection between the adjusting bolt and the slider, thereby changing the installation position of the slider inside the sleeve. A protrusion is fixedly connected to the side of the slider, and the slider is adjusted by thread drive through the protrusion.

[0016] Preferably, a hollow plate is provided on the inner side of the injection cavity parallel to the distribution plate, and a contact wedge is fixedly connected to the side of the hollow plate corresponding to the hinge rod. The contact wedge provided by the hollow plate can not only facilitate the installation of the contact wedge against the side of the hinge rod, but also will not hinder the flow of liquid in the injection cavity.

[0017] An inner ring is fixedly connected to the outer side of the hollow plate corresponding to the inner diameter of the injection cavity, and a positioning screw is inserted into the side of the inner ring. The hollow plate is installed and adjusted inside the injection cavity through the inner ring and the positioning bolt.

[0018] Preferably, a sliding groove is provided on the side of the hinge rod, and the contact wedge block is slidably adjusted along the hinge rod through the sliding groove. A fixed block is fixedly connected to the side of the contact wedge block corresponding to the sliding groove, which facilitates the limited installation of the contact wedge block through the sliding groove to ensure the sliding of the contact wedge block along the hinge rod during the adjustment process.

[0019] The positioning screw passes through the side wall of the injection chamber and is rotatably connected thereto, and a gear is fixedly sleeved on the side of the positioning screw. The relative position of the positioning screw and the injection chamber is fixed, and the installation of the inner ring is anchored by the positioning bolt, and the inner ring is meshed, driven and positioned by the gear on the side of the positioning bolt.

[0020] Preferably, the side wall of the inner ring is obliquely penetrated with a positioning groove, and a fixing block meshing with a gear is arranged on the inner side of the positioning groove. The positioning screw realizes the meshing connection between the injection chamber and the inner ring through the gear on the side. The positioning screw passes through the side thread sleeve of one end of the side wall of the injection chamber and is connected with a tightening nut. After loosening the tightening nut, the positioning bolt is rotated, and the inner ring is driven to rotate and advance through the meshing relationship between the gear on the side of the positioning bolt and the positioning groove, thereby realizing the adjustment of the inner ring and the inner ring side contact wedge block, compensating for the driving error between the hinge rod and the shift rod, and realizing the adjustment of the advancement distance and time of the blocking block.

[0021] A boiling granulation dryer comprises the above-mentioned spraying device, which replaces the original spraying device to spray liquid materials, controls the droplet volume and spraying interval of the sprayed liquid materials, avoids the material droplets being too small to fall into the fluid bed granulation chamber and adhere to the granular materials for granulation, and avoids the disordered fusion of atomized dense droplets that affects drying, thereby achieving precise control of the liquid material spraying volume and time interval, and facilitating the production of granulation equipment.

[0022] The present invention discloses a spray device and a boiling granulation dryer, which have the following beneficial effects:

[0023] 1. The spray device and boiling granulation dryer are conveniently designed to accurately control the spray interval and droplet volume of liquid materials. The spray device replaces the atomizing spray device used in the existing granulation dryer. A distribution plate for controlling the spray range is arranged in the spray chamber, a blocking block for blocking the nozzle is arranged through the distribution plate, and a lever for driving the blocking block to periodically advance is arranged to achieve uniform spraying of the liquid material in the spray chamber. The volume and spray interval of the spray droplets are controlled by controlling the advance distance and advance time of the blocking block to ensure that the droplets fall into the granulation chamber to mix and bond with the mother seed powder for uniform granulation. The uniform granulation is also beneficial to the subsequent drying of the granulation, avoiding spending excessive time to ensure the drying of the granulation, and is beneficial to the control of the granulation quality.

[0024] 2. The spray device and boiling granulation dryer change the way of atomizing liquid materials by using a nozzle in the existing granulation dryer, so as to avoid disordered fusion caused by dense atomized liquid droplets affecting the drying process. In addition, the atomized droplets are too small and dry before they fall into the granulation chamber, and cannot be mixed and bonded with the mother seed powder in the granulation chamber for granulation. Therefore, a distribution plate for conveniently controlling the spray coverage area and a nozzle with a larger spray diameter are arranged in the device, and a blocking block is arranged to block the nozzle. By controlling the advance distance and advance cycle of the blocking block, the volume and interval time of the liquid sprayed by the nozzle are controlled, so that the droplets can fall into the granulation chamber and combine with the mother seed powder for granulation.

[0025] 3. The injection device and the boiling granulation dryer are provided with a hinge rod for controlling the advancing period and advancing distance of the sealing block, and are provided with a reset spring and an adjusting bolt which can adjust the tightening force of the hinge rod, so as to ensure the sealing effect of the sealing block on the nozzle. In addition, a hollow plate and a contact wedge block whose height can be adjusted along the hinge rod are provided in the injection chamber. The installation position of the contact wedge block on the side of the hinge rod is adjusted according to the use requirements, so as to control the adjustment of the sealing block by the lever. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the injection device of the present invention;

[0029] Figure 3 It is an assembly diagram of the injection device of the present invention;

[0030] Figure 4 This is a schematic diagram of the inner structure of the distribution plate of the present invention;

[0031] Figure 5 This is a schematic diagram of the installation structure of the blocking block on the upper surface of the distribution plate of the present invention;

[0032] Figure 6 This is a schematic diagram of the installation structure of the hollow plate of the present invention;

[0033] Figure 7 It is a schematic diagram of the adjustment and positioning structure of the hollow plate of the present invention.

[0034] In the figure: 1. pipeline; 2. peristaltic pump; 3. injection chamber; 4. distribution plate; 5. nozzle; 6. blocking block; 7. reset spring; 8. lever; 9. retaining ring; 10. mounting sleeve; 11. sealing rubber ring; 12. driving shaft; 13. hinge seat; 14. hinge rod; 15. sealing rubber pad; 16. sleeve; 17. slider; 18. adjusting bolt; 19. bump; 20. hollow plate; 21. contact wedge; 22. inner ring; 23. positioning screw; 24. slide groove; 25. gear; 26. positioning bevel groove; 27. tightening nut. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The embodiment of the present invention discloses a spray device and a boiling granulation dryer;

[0037] According to the attached Figure 2 As shown, it includes a pipeline 1 and an injection chamber 3, the end of the pipeline 1 is fixedly connected to the injection chamber 3, and a peristaltic pump 2 is arranged at the end of the pipeline 1 away from the injection chamber 3. The peristaltic pump 2 transports the liquid material from the pipeline 1 to the injection chamber 3 for injection.

[0038] According to the attached Figure 3 and attached Figure 5 As shown, a distribution plate 4 is provided at the bottom of the injection chamber 3, a nozzle 5 is penetrated through the side of the distribution plate 4, and a blocking block 6 is also provided on the upper surface of the distribution plate 4. The injection of the nozzle 5 is controlled by the blocking block 6, and the injection range of the liquid material transported into the injection chamber 3 is controlled by the distribution plate 4. Because the nozzle 5 is blocked by the blocking block 6, the liquid pressure in the injection chamber 3 increases, and the nozzle 5 is controlled to perform intermittent injection regularly by controlling the periodic advance of the blocking block 6. The liquid injection volume is controlled by controlling the injection duration of the nozzle 5 and the advance distance of the blocking block 6, and the time interval between adjacent injection droplets is achieved by controlling the movement cycle of the blocking block 6.

[0039] According to the attached Figure 3 , Attachment Figure 4 and attached Figure 5 As shown, a driving shaft 12 is arranged at the center of the inner top wall of the injection chamber 3. The driving shaft 12 rotates at a uniform speed under the control of the driving control structure. A shifting rod 8 is fixed to the side of the driving shaft 12 close to one end of the distribution plate 4 in an annular manner with equal distances.

[0040] The bottom inner wall of the injection chamber 3 is fixedly connected with a retaining ring 9 corresponding to the distribution plate 4, and the bottom of the injection chamber 3 is threadedly sleeved with a mounting sleeve 10 corresponding to the distribution plate 4. The inner sides of the injection chamber 3 and the mounting sleeve 10 are both provided with sealing rubber rings 11. The distribution plate 4 is installed from the bottom of the injection chamber 3 to the liquid outlet end of the injection chamber 3 to close the injection chamber 3, and is positioned by pressing against the retaining ring 9 on the inner side of the injection chamber 3, and then pressing against the other side of the distribution plate 4 by the mounting sleeve 10 to position it.

[0041] The upper surface of the distribution plate 4 is fixedly connected with a hinge seat 13 corresponding to the rotation direction of the lever 8, and a hinge rod 14 is hingedly arranged on the inner side of the hinge seat 13. The sealing block 6 is fixed on the side of the hinge rod 14 corresponding to the position of the nozzle 5. A return spring 7 is arranged at one end of the hinge rod 14 away from the sealing block 6, and the sealing block 6 is pressed against the nozzle 5 by the return spring 7 to seal the nozzle 5.

[0042] Sealing rubber pads 15 are provided on the sides of the nozzle 5 and the sealing block 6 . The provision of the sealing rubber pads 15 is more conducive to the sealing of the nozzle 5 by the sealing block 6 .

[0043] The upper surface of the distribution plate 4 is fixedly connected with a sleeve 16 corresponding to the reset spring 7, and a slider 17 is slidably arranged on the inside of the sleeve 16. The reset spring 7 extends to the inside of the sleeve 16 away from one end of the hinge rod 14 and is fixedly connected to the slider 17. The reset spring 7 is installed tightly by the slider 17, which facilitates the adjustment of the clamping force of the reset spring 7 on the hinge rod 14, thereby ensuring the sealing effect of the sealing block 6 at the other end of the hinge rod 14 on the nozzle 5.

[0044] An adjusting bolt 18 penetrates and is rotatably connected to the lower surface of the distribution plate 4. The adjusting bolt 18 extends into the inner side of the sleeve 16 and penetrates the slider 17. The adjusting bolt 18 is threadedly connected to the slider 17. The slider 17 is driven to move inside the sleeve 16 through the threaded connection between the adjusting bolt 18 and the slider 17, and the slider 17 is supported and positioned through the threaded connection, thereby realizing the adjustment of the elastic force of the reset spring 7.

[0045] The side of the slider 17 is fixedly connected with a protrusion 19, and the slider 17 slides along the inner side of the sleeve 16 through the side protrusion 19, avoiding the problem that the adjusting bolt 18 cannot drive the slider 17 to move due to the lack of a limiting structure.

[0046] According to the attached Figure 5 , Attachment Figure 6 and attached Figure 7As shown, a hollow plate 20 is provided on the inner side of the injection cavity 3 parallel to the distribution plate 4, and a contact wedge 21 is fixedly connected to the side of the hollow plate 20 corresponding to the hinge rod 14. The contact wedge 21 is provided by the hollow plate 20, which will not affect the flow of liquid in the injection cavity 3. At the same time, the contact wedge 21 can be adjusted through the hollow plate 20 to supplement the distance between the lever 8 and the hinge rod 14 and adjust the deflection angle of the hinge rod 14, thereby realizing the adjustment of the volume of liquid sprayed by the nozzle 5.

[0047] A fixed block is fixed on the lower surface of the contact wedge block 21, and a sliding groove 24 is opened on the side of the hinge rod 14. The contact wedge block 21 slides and adjusts along the hinge rod 14 through the sliding groove 24. The hinge rod 14 guides and limits the advancement of the contact wedge block 21 through the sliding groove 24 to prevent the contact wedge block 21 from being misplaced when the hollow plate 20 is adjusted.

[0048] An inner ring 22 is fixedly connected to the outer side of the hollow plate 20 corresponding to the inner diameter of the injection cavity 3, and a positioning screw 23 is inserted into the side of the inner ring 22. The positioning screw 23 positions the inner ring 22 to achieve positioning and installation of the hollow plate 20 inside the injection cavity 3.

[0049] The positioning screw 23 passes through the side wall of the injection chamber 3 and is rotatably connected thereto, and a gear 25 is fixedly sleeved on the side of the positioning screw 23. A positioning bevel 26 is obliquely penetrated through the side wall of the inner ring 22. The positioning screw 23 is meshed and connected to the inner ring 22 via the positioning bevel 26. The rotation of the inner ring 22 is controlled by rotating the positioning screw 23. The rotating inner ring 22 drives the inner hollow plate 20 and the contact wedge 21 to move along the hinge rod 14, thereby adjusting the driving distance between the shift rod 8 and the hinge rod 14.

[0050] The positioning screw 23 passes through the side thread sleeve of one end of the side wall of the injection chamber 3 and is connected with a tightening nut 27. After loosening the tightening nut 27, the positioning screw 23 is rotated to adjust the installation position of the inner hollow plate 20. After the adjustment is completed, the tightening nut 27 is tightened to position the positioning screw 23, and the inner ring 22 is positioned by utilizing the meshing relationship between the tightening nut 27 and the inner ring 22.

[0051] According to the attached Figure 1 As shown, a boiling granulation dryer includes the above-mentioned injection device, which is used to replace the original injection device to inject liquid materials, and the droplet volume of the injected liquid material is controlled according to the injection interval to avoid the material droplets being too small to fall into the fluid bed granulation chamber and adhere to the granular material for granulation, and to avoid the disordered fusion of the dense atomized droplets that affects the drying, thereby achieving precise control of the injection volume and time interval of the liquid material, and facilitating the production of the granulation equipment.

[0052] The spray device and boiling granulation dryer are designed to conveniently and accurately control the spray interval and droplet volume of liquid materials. The spray device replaces the atomizing spray device used in the existing granulation dryer. A distribution plate 4 for controlling the spray range is arranged in the spray cavity 3. A blocking block 6 for blocking the nozzle 5 is arranged through the distribution plate 4, and a lever 8 for driving the blocking block 6 to periodically advance is arranged to achieve uniform spraying of the liquid material in the spray cavity 3. The volume and spray interval of the spray droplets are controlled by controlling the advance distance and advance time of the blocking block 6, so as to ensure that the droplets fall into the granulation chamber to mix and bond with the mother seed powder for uniform granulation. The uniform granulation is also beneficial to the subsequent drying of the granulation, avoiding spending excessive time to ensure the drying of the granulation, and is beneficial to the control of the granulation quality.

[0053] Furthermore, the method of using a nozzle to atomize liquid materials in the existing granulation dryer is changed to avoid disordered fusion caused by dense atomized liquid droplets that affect the drying process. In addition, the atomized droplets are too small and dry before they fall into the granulation chamber, and cannot be mixed and bonded with the mother seed powder in the granulation chamber for granulation. Therefore, a distribution plate 4 for convenient control of the spray coverage area and a nozzle 5 with a larger spray diameter are provided in the present device, and a blocking block 6 is provided to block the nozzle 5. The volume and interval time of the liquid sprayed by the nozzle 5 are controlled by controlling the advance distance and advance period of the blocking block 6, so that the droplets can fall into the granulation chamber and combine with the mother seed powder for granulation.

[0054] Furthermore, a hinge rod 14 is provided for controlling the advancement period and advancement distance of the sealing block 6, and a return spring 7 and an adjusting bolt 18 which can adjust the tightening force on the hinge rod 14 are provided to ensure the sealing effect of the sealing block 6 on the nozzle 5. In addition, a hollow plate 20 and a contact wedge block 21 which can be adjusted in height along the hinge rod 14 are provided in the injection chamber 3. The installation position of the contact wedge block 21 on the side of the hinge rod 14 is adjusted according to the use requirements, thereby controlling the adjustment of the blocking block 6 by the lever 8.

[0055] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A spraying device, comprising a pipeline (1) and a peristaltic pump (2), wherein one end of the pipeline (1) is fixedly connected to the peristaltic pump (2), characterized in that: One end of the pipeline (1) away from the peristaltic pump (2) is fixedly connected to an injection chamber (3), the inner bottom of the injection chamber (3) is provided with a distribution plate (4), the side wall of the distribution plate (4) is penetrated by a nozzle (5), the upper surface of the distribution plate (4) and located inside the nozzle (5) is provided with a blocking block (6), one side of the blocking block (6) is tightly provided with a return spring (7), and a lever (8) is provided above the distribution plate (4) corresponding to the rotation of the blocking block (6), the blocking block (6) forms a blockage on the nozzle (5) under the action of the return spring (7), and the lever (8) periodically rotates to drive the blocking block (6) to move forward to expose the nozzle (5) for intermittent liquid injection.

2. The spraying device according to claim 1, characterized in that: A retaining ring (9) is fixedly connected to the inner wall of the bottom of the injection chamber (3) corresponding to the distribution plate (4), a mounting sleeve (10) is threadedly sleeved on the bottom of the injection chamber (3) corresponding to the distribution plate (4), and a sealing rubber ring (11) is provided on the inner sides of both the injection chamber (3) and the mounting sleeve (10).

3. The spraying device according to claim 1, characterized in that: A driving shaft (12) is provided in the middle of the top wall of the injection chamber (3), and the driving shaft (12) is driven to rotate by a driving control unit. A plurality of shifting rods (8) are fixed in a circular shape at equal intervals on the side surface of the driving shaft (12) close to one end of the distribution plate (4).

4. The spraying device according to claim 1, characterized in that: The upper surface of the distribution plate (4) is fixedly connected to a hinge seat (13) corresponding to the rotation direction of the lever (8); a hinge rod (14) is hingedly provided inside the hinge seat (13); the blocking block (6) is fixed to the side of the hinge rod (14) corresponding to the position of the nozzle (5); a sealing rubber pad (15) is provided on the side of the nozzle (5) and the blocking block (6); and the return spring (7) is fixedly connected to the side of the hinge rod (14) away from the blocking block (6).

5. The spraying device according to claim 1, characterized in that: The upper surface of the distribution plate (4) is fixedly connected to a sleeve (16) corresponding to the reset spring (7), a slider (17) is slidably arranged inside the sleeve (16), and one end of the reset spring (7) away from the hinge rod (14) extends to the inside of the sleeve (16) and is fixedly connected to the slider (17).

6. The spraying device according to claim 1, characterized in that: An adjusting bolt (18) penetrates and is rotatably connected to the lower surface of the distribution plate (4); the adjusting bolt (18) extends into the inner side of the sleeve (16) and penetrates the slider (17); the adjusting bolt (18) is threadedly connected to the slider (17); and a protrusion (19) is fixedly connected to the side of the slider (17).

7. The spraying device according to claim 1, characterized in that: A hollow plate (20) is provided on the inner side of the injection cavity (3) parallel to the distribution plate (4); a contact wedge (21) is fixedly connected to the side of the hollow plate (20) corresponding to the hinge rod (14); an inner ring (22) is fixedly connected to the outer side of the hollow plate (20) corresponding to the inner diameter of the injection cavity (3); and a positioning screw (23) is inserted into the side of the inner ring (22).

8. The spraying device according to claim 7, characterized in that: A slide groove (24) is provided on the side of the hinge rod (14), and the contact wedge (21) is slidably adjusted along the hinge rod (14) through the slide groove (24). The positioning screw (23) penetrates the side wall of the injection chamber (3) and is rotatably connected thereto, and a gear (25) is fixedly sleeved on the side of the positioning screw (23).

9. The spraying device according to claim 7, characterized in that: The side wall of the inner ring (22) is obliquely penetrated with a positioning bevel groove (26), the positioning screw (23) is meshedly connected with the inner ring (22) through the positioning bevel groove (26), and the side thread sleeve of one end of the positioning screw (23) that penetrates the side wall of the injection chamber (3) is connected with a tightening nut (27).

10. A fluidized bed granulation dryer, characterized in that: The spraying device comprises any one of claims 1 to 9, and the spraying device is used to replace the original spraying device to spray the liquid material, so as to avoid that the material droplets are too small to fall into the fluid bed granulation chamber and adhere to the granular material for granulation.

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