Continuous drying and cooling integrated equipment for medical plaster bandages

Abstract

The invention relates to the technical field of gypsum bandage drying, in particular to medical gypsum bandage continuous type drying and cooling integrated equipment which comprises a multi-section type drying oven and a dehumidification device communicated with the multi-section type drying oven. The multi-section drying oven is divided into a first section, a second section, a third section and a buffer section by the first partition plates; through reasonable layout of temperature and humidity, multi-dimensional optimization of structural stability, mechanical properties and energy-saving efficiency in the gypsum bandage drying process is achieved, and the problems of stress cracking, moisture regain, high energy consumption and the like caused by sudden change of temperature and humidity in a traditional process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gypsum bandage drying, and particularly relates to an integrated device for continuous drying and cooling of medical gypsum bandages. Background Art

[0002] Medical gypsum bandages are made of sized bandages and plaster of Paris powder. After being soaked in water, they can harden and set in a short time, have strong shaping ability and good stability, and are widely praised in the medical field.

[0003] The production of medical gypsum bandages generally includes raw material preparation, gypsum slurry preparation, bandage substrate treatment, impregnation, coating, drying and cooling, cutting and winding, and sterilization and packaging. Among them, drying and cooling, as an important link in the production of medical gypsum bandages, has not been taken seriously. The existing drying and cooling methods generally use a high-temperature hot air circulation oven to blow the bandages coated with gypsum up and down with circulating hot air to solidify the gypsum on the surface of the bandages, and then maintain their shape during the cooling process to achieve the solidification effect. However, this method has the following disadvantages: 1. In order to improve the drying efficiency during drying, the existing oven drying generally uses dry and hot high-temperature air for drying. However, this method is likely to cause the surface of the gypsum to quickly crust and lock its internal voids, resulting in the evaporation of internal moisture being blocked and forming steam bubbles. This not only causes bubbles on the surface of the gypsum and affects the use comfort, but also easily leads to mildew, thus affecting the drying effect.

[0004] 2. When the bandage enters the oven from the outside, the temperature difference is relatively large and the heating rate is too fast. It is easy to cause the accumulation of internal stress due to different evaporation rates of internal and external moisture, and then cause internal cracks or edge delamination, resulting in an increase in the defective rate.

[0005] 3. There is a lack of a pretreatment device, and the sized gypsum bandage lacks pretreatment before entering the drying process, resulting in the bandage being prone to friction and generating static electricity when it enters. This not only adsorbs thread ends or fiber debris, forming local accumulations, resulting in uneven structure or rough surface after curing, but also repels the slurry due to the charged area, causing uneven distribution of the gypsum slurry on the base cloth, forming local thin or thick areas, and affecting the mechanical properties after curing. Summary of the Invention

[0006] In order to solve the problem that in order to improve the drying efficiency during drying, the existing oven drying generally uses dry and hot high-temperature air for drying, which not only causes bubbles on the surface of the gypsum and affects the use comfort, but also easily leads to mildew, thus affecting the drying effect, the present invention provides an integrated device for continuous drying and cooling of medical gypsum bandages.

[0007] The integrated device for continuous drying and cooling of medical gypsum bandages provided by the present invention adopts the following technical solutions: A continuous drying and cooling integrated device for medical plaster bandages, comprising a multi-section oven and a dehumidifying device communicated therewith. A plurality of first partitions are arranged in the multi-section oven, and the first partitions divide the multi-section oven into a first section, a second section, a third section and a buffer section; a bandage inlet for the entry of the bandage body is arranged at the bottom outside the first section, a bandage outlet is arranged at the bottom outside the third section, and a hot air pipe for introducing hot and humid air is arranged at the lower part of the first section; A pretreatment device is arranged in the first section. The pretreatment device comprises a second rotating shaft and a fixed shaft arranged in parallel. The front and rear ends of the second rotating shaft are rotatably connected to the inner wall of the first section, and a first roller is fixedly arranged in the middle of the second rotating shaft; the fixed shaft is located below the second rotating shaft and its two ends are fixed to the inner wall of the first section, and a second roller rotatably matched with the fixed shaft is correspondingly arranged in the middle of the fixed shaft. Sliding sleeves are sleeved on the fixed shaft on both sides of the second roller, and horizontally arranged inserting blocks are detachably arranged on one side of the sliding sleeve facing the second roller. The thickness of the inserting block gradually decreases from one side of the sliding sleeve to one side of the second roller; an annular slot matched with the inserting block is arranged on the side surface of the first roller, an installation groove penetrating outward is arranged in the annular slot, a cutting knife is arranged in the installation groove, a top block is fixedly arranged on the inner side of the cutting knife, the inner side of the top block abuts against the outer side surface of the inserting block, and a return spring is arranged between the outer side of the top block and the installation groove; a reciprocating driving mechanism for driving the sliding sleeve to slide reciprocally is arranged on the first roller.

[0008] By adopting the above technical solution, hot and humid air is introduced into the first section through the hot air pipe to maintain the stability of the humidity and temperature therein, so as to realize the initial stage hot and humid drying of the bandage. Specifically: the temperature of the first section is 30 - 40 °C, and the humidity is maintained at 60% - 70%RH. Therefore, when the coated bandage body enters the first section, due to the high penetration of the hot and humid air, the inside and outside of the plaster can be fully preheated, which can delay the rapid water loss on the surface of the plaster, avoid the premature hardening of the surface layer to form a "hard shell", thereby allowing the internal moisture to migrate uniformly through capillary action, reducing the internal stress, reducing the risk of cracks, and also avoiding the phenomenon of rapid surface shrinkage, delamination or edge warping caused by drying with dry hot gas. At the same time, the specific heat capacity of the hot and humid air is relatively high, and the heat transfer efficiency is better than that of dry hot air, and the energy consumption is reduced at the same temperature. This part can remove 10% - 15% of the moisture of the bandage body; the hot and humid air can also form a hot and humid environment for preheating and drying inside, thereby reducing the risk of static electricity accumulation, avoiding the generation of static electricity leading to the adsorption of thread ends or fiber debris, forming local accumulation, avoiding uneven structure or rough surface after curing, and also avoiding the problem of uneven distribution of the plaster slurry on the base cloth due to static electricity, avoiding the formation of local thin or thick parts, and ensuring the mechanical properties after curing.

[0009] A pretreatment device is provided, which can cooperate with the first roller and the second roller so that the bandage body passes through the space between the first roller and the second roller during production, thereby driving the first roller and the second roller to rotate. The extrusion of the first roller and the second roller can evenly distribute the gypsum slurry, and can also squeeze out the air bubbles in the gypsum slurry, avoiding the problem of subsequent drying and bubbling, and improving the quality of the bandage. At the same time, the extrusion of the first roller and the second roller can also increase the pores of the base cloth, which not only makes it easier to adhere to the gypsum slurry, reducing the problems of delamination or edge warping, but also can improve the penetration of the humid and hot air, further improving the effect of the initial stage of humid and hot drying. Then, through the reciprocating drive mechanism, the sliding sleeve and the insertion block can reciprocate axially, so that the blade moves downward by squeezing the top block to cut off the thread ends on both sides of the bandage body, avoiding the problems of thread end contamination of the bandage body and affecting the quality of the subsequent finished product. After each single cutting, the top block and the cutter are reset by the rebound of the return spring.

[0010] Optionally, the reciprocating drive mechanism is arranged in the installation cavity inside the sliding sleeve. A plurality of chutes communicating with the installation cavity are evenly arranged on the side of the installation cavity away from the second roller. The chutes are arranged axially. A second slider matching the chutes is correspondingly arranged on the second roller. A first spring is sleeved outside the fixed shaft between the second slider and the inner wall of the installation cavity. On the second rotating shafts on both sides of the first roller, multiple spiral grooves are evenly arranged circumferentially. One end of a section of spiral groove is provided with a transverse groove communicating with the other end of the adjacent spiral groove. A first slider matching the spiral groove and the transverse groove is arranged on the sliding sleeve.

[0011] By adopting the above technical solution, when the first roller rotates, it can drive the second rotating shaft to rotate, so that the sliding sleeve moves axially outward by using the sliding of the first slider in the spiral groove. When the first slider moves into the transverse groove, the sliding sleeve is reset under the action of the first spring, thereby realizing the reciprocating movement of the sliding sleeve.

[0012] Optionally, a through hole is arranged in the fixed shaft. A suction pipe communicating with the through hole is arranged at the rear side of the fixed shaft. The suction pipe is communicated with an external air extraction pump. A dust suction pipe communicating with the through hole is arranged on the fixed shaft between the sliding sleeve and the second roller. The free end of the dust suction pipe extends to the gap between the first roller and the second roller. The free end of the dust suction pipe faces the blade.

[0013] Through the arrangement of the suction pipe, the through hole and the dust suction pipe, the external air extraction pump can be used to suck to form negative pressure in the through hole, and then suck the thread ends cut by the blade from the dust suction pipe, avoiding the thread ends falling into the first section to contaminate the subsequent passing bandage body.

[0014] Optionally, multiple groups of second partitions are sequentially arranged in the second section, and the second partitions divide the second section into multiple circulation drying zones; multiple groups of fourth partitions are sequentially arranged in the third section, and the fourth partitions divide the third section into a high-temperature and high-humidity zone, a medium-temperature and medium-humidity zone, and a low-temperature and low-humidity zone arranged in sequence; the first section, the high-temperature and high-humidity zone, the medium-temperature and medium-humidity zone, the low-temperature and low-humidity zone and the lower part of each circulation drying zone are all provided with independently controlled hot air ducts; the multi-section oven is provided with guide rollers for guiding the movement of the bandage body, the bandage body can enter the second section from the upper part of the first section, the bandage body can make multiple turns between the circulation drying zones on both sides of the second section, the bandage body enters the high-temperature and high-humidity zone from the lower part of the second section, the bandage body can enter the medium-temperature and medium-humidity zone from the upper part of the high-temperature and high-humidity zone, and enter the low-temperature and low-humidity zone from the lower part of the medium-temperature and medium-humidity zone, the bandage body enters the buffer section from the low-temperature and low-humidity zone and passes through the bandage outlet.

[0015] By adopting the above technical solution, independently controlled hot air pipes can be used to introduce hot air of different humidity and temperature into the second and third sections, while maintaining stable humidity and temperature within them. This allows for drying of the bandage body by increasing temperature and decreasing humidity in the middle section, and drying of the bandage body by gradient cooling and decreasing humidity at the end. Through the rational layout of temperature and humidity, multi-dimensional optimization of structural stability, mechanical properties, and energy efficiency is achieved during the drying process of the plaster bandage, solving the pain points of traditional processes such as stress cracking, moisture resorption, and high energy consumption caused by sudden changes in temperature and humidity. The details are as follows: Mid-section heating and dehumidification drying: The temperature of the left circulating drying zone is 40°C, and the humidity is maintained at 60%-70%RH; the temperature of the right circulating drying zone is 60°C, and the humidity is maintained at 20%-30%RH. The temperature difference between adjacent circulating drying zones does not exceed 5°C, and the humidity difference does not exceed 5%RH. Therefore, when the bandage body moves from the left circulating drying zone to the right circulating drying zone, the ambient temperature gradually increases, while the humidity gradually decreases. On the one hand, the increase in temperature difference is used to increase the evaporation rate. On the other hand, the temperature increase causes the moisture inside the material to expand, and combined with the low RH environment to form a "suction effect", driving the deep moisture to migrate to the surface, thereby achieving the purpose of rapid drying; the setting of the guide roller can make the bandage body realize multiple returns between the circulating drying zones on the left and right sides, so that the bandage body first changes from low temperature and high temperature to high temperature in a single return round. The moisture is transferred to a high-temperature and low-humidity environment, achieving "temperature increase and humidity reduction", thereby promoting the accelerated evaporation of moisture in the bandage body, and then it is transferred from a high-temperature and low-humidity environment to a low-temperature and high-humidity environment, achieving "cooling and humidification", avoiding condensation of moisture on the plaster surface and rewetting, while allowing the plaster surface to absorb moisture moderately, avoiding the internal moisture from "locking" on the surface and forming internal stress; from the right-side circulation drying zone alone, the bandage body can intermittently enter its interior for short-term rapid drying, which can not only ensure drying efficiency, but also avoid agglomeration due to excessive drying time, thereby avoiding surface blistering and reducing the probability of mildew; through temperature-humidity coupling control, low RH is used to accelerate dehydration in the heating stage, and high RH is used to prevent condensation and promote moisture redistribution in the cooling stage, taking into account both drying efficiency and drying quality. This section can remove 75% to 80% of moisture.

[0016] End gradient cooling, dehumidification and drying: The temperature in the high temperature and high humidity area is 60℃, and the humidity is maintained at 60%~70%RH; the temperature in the medium temperature and medium humidity area is 40-50℃, and the humidity is maintained at 40%~50%RH; the temperature in the low temperature and low humidity area is 30-40℃, and the humidity is maintained at 20%~30%RH. The bandage body enters the high temperature and high humidity area from the right circulation drying area. The surface humidity is increased while the temperature remains unchanged, allowing its surface to absorb some moisture at the initial stage of entry, preventing the surface from hardening prematurely and hindering the discharge of internal moisture. Then, gradient cooling and dehumidification are used to promote the gradual diffusion of moisture from the inside to the outside, reducing the phenomenon of local undried or over-drying, avoiding shrinkage stress concentration, and preventing cracking and deformation. This section can remove the remaining 10%~15% moisture inside the bandage body.

[0017] Optionally, the circulating drying zone is sequentially provided with a plurality of third partitions, the third partitions divide the circulating drying zone into a plurality of circulating drying chambers, and the third partitions are provided with vents communicating with adjacent circulating drying chambers.

[0018] By adopting the above technical solution, through the arrangement of the circulating drying chamber and the ventilation holes, a small temperature difference and humidity difference can be formed between adjacent circulating drying chambers in a single circulating drying area, that is, the temperature gradually decreases from bottom to top, and the humidity gradually increases from bottom to top, so as to form a gradually drying environmental gradient between the upper and lower layers in the circulating drying area, enabling the temperature gradient change while the bandage body is undergoing temperature rise and fall circulating drying, further improving the drying efficiency and drying quality.

[0019] Optionally, fixing seats are provided on the front and rear inner walls of the high-temperature and high-humidity area, the medium-temperature and medium-humidity area, and the low-temperature and low-humidity area. An opening groove is provided on the fixing seat, and a tensioning roller for tensioning the bandage body is arranged between the corresponding opening grooves. A guiding rod passing through the end of the tensioning roller is fixedly arranged in the opening groove. A guiding hole is correspondingly arranged on the tensioning roller, and a second spring is sleeved outside the guiding rod between the tensioning roller and the inner wall of the opening groove.

[0020] By adopting the above technical solution, the tensioning roller and the second spring can be used to tension the passing bandage body. By presetting the position of the fixing seat and selecting the elastic modulus of the second spring, a gradually decreasing tension force can be achieved in the advancing direction of the bandage. The preset tensions in actual use are generally 54N, 40N, and 18N respectively. Through high-temperature and high-tension, anti-wrinkle and excessive shrinkage can be achieved. Through medium-temperature and medium-tension, the shrinkage rates of the base fabric and the gypsum slurry can be coordinated, reducing the risk of delamination. Through low-temperature and low-tension, shaping and elimination of residual stress can be achieved, thereby ensuring the quality of the bandage after cooling.

[0021] Optionally, the dehumidifying device includes a dehumidifying box fixed above the multi-section oven. The lower end of the dehumidifying box is respectively communicated with the first section, the second section, and the third section through air suction ports. A dehumidifying fan is arranged in the dehumidifying box. The air suction end of the dehumidifying fan is communicated with the air suction port, and the air exhaust end of the dehumidifying fan is communicated with a dehumidifying pipe extending outside the dehumidifying box. A dehumidifying motor for driving the dehumidifying fan is arranged at the rear side of the dehumidifying box.

[0022] Optionally, a circulating fan is further arranged in the dehumidifying box. The air suction end of the circulating fan is communicated with the air suction port, and the air exhaust end of the circulating fan is communicated with a circulating return pipe extending into the first section. A circulating motor for driving the circulating fan is arranged at the rear side of the dehumidifying box. The circulating return pipe extends to the bandage inlet and is located above the bandage body, and the circulating return pipe is arranged downward.

[0023] By adopting the above technical solution, through the arrangement of the circulating fan and the circulating return pipe, part of the waste heat and water vapor can be introduced into the first section, achieving waste heat utilization, saving energy consumption, and at the same time reducing the moisture supplement in the first section, further saving costs. Through the arrangement of the circulating return pipe, while assisting in drying the bandage body, an air curtain can be formed at the bandage inlet, thereby preventing external sundries from entering through the bandage inlet and polluting the bandage body.

[0024] Optionally, first rotating shafts are symmetrically arranged on the upper and lower sides of the bandage body at the uppermost part of each circulating drying zone. The first rotating shafts are rotatably connected between the front and rear walls of the circulating drying zone. Pressing plates extending obliquely towards the bandage body are fixedly arranged on the first rotating shafts. The ends of the pressing plates are in contact with the surface of the bandage body, and torsion springs are arranged on the first rotating shafts.

[0025] By adopting the above technical solution, with the arrangement of the torsion springs, the first rotating shafts and the pressing plates, the pressing plates can be attached to the surface of the bandage body. Thus, before high-temperature drying, tiny air bubbles on the surface of the bandage body can be discharged through physical extrusion, reducing the probability of blistering on the surface of the bandage body. At the same time, the bandage body is repeatedly tightened and loosened, expanding the pores, thereby improving the removal of internal moisture.

[0026] Optionally, negative pressure branch pipes are arranged in the first section, the high-temperature and high-humidity zone, the medium-temperature and medium-humidity zone, and the low-temperature and low-humidity zone. A negative pressure main pipe communicated with each negative pressure branch pipe is fixedly arranged at the rear side of the multi-section oven, and the negative pressure main pipe is communicated with an external negative pressure fan.

[0027] By adopting the above technical solution, through the arrangement of the negative pressure branch pipes and the negative pressure main pipe, a negative pressure environment can be formed on both sides where the bandage body enters and exits. This can not only promote the removal of moisture and improve the drying efficiency, but also reduce the overflow of gypsum dust and maintain the surrounding production environment. At the same time, the layout of low temperatures at both ends can also form heat preservation for the intermediate high-temperature environment, thereby reducing energy consumption.

[0028] In summary, the present invention includes at least one of the following beneficial technical effects: Using independently controlled hot air pipes to introduce hot air with different humidities and temperatures into the first section, the second section, and the third section and maintaining the stability of the humidity and temperature therein, so as to realize the initial stage wet-heat drying, the middle stage heating and humidity reduction drying, and the end stage gradient cooling and humidity reduction drying of the bandage body. Through the rational layout of temperature and humidity, multi-dimensional optimization of the structural stability, mechanical properties, and energy-saving efficiency in the drying process of the gypsum bandage is achieved, solving the pain points such as stress cracking, moisture return, and high energy consumption caused by sudden changes in temperature and humidity in the traditional process; By setting the guide rollers, the bandage body can be folded back multiple times between the circulating drying areas on the left and right sides, achieving multiple cycles of "heating and dehumidifying" and "cooling and humidifying" for the bandage body. This can not only ensure the drying efficiency but also prevent caking due to excessive drying time, thus avoiding surface blistering and reducing the probability of mildew. At the same time, by rapidly raising and lowering the temperature, the plaster gradually releases residual stress during thermal expansion and contraction, avoiding stress concentration caused by a single large temperature change, and further reducing the generation of cracks. Moreover, from a microscopic perspective, the rapid temperature change inhibits the excessive growth of plaster crystals, forming fine and uniform grains, enhancing the interfacial bonding strength between the fibers and the plaster, and thus reducing the probability of internal cracks or edge delamination, thereby improving the yield rate. By setting the negative pressure branch pipe and the negative pressure main pipe, a negative pressure environment can be formed on both sides where the bandage body enters and exits. This can not only promote the removal of moisture and improve the drying efficiency but also reduce the overflow of plaster dust and maintain the surrounding production environment. At the same time, the layout with low temperatures at both ends can also provide heat insulation for the high-temperature environment in the middle, thereby reducing energy consumption. Description of the Drawings

[0029] Figure 1 Is a perspective view of the rear view direction of the present invention; Figure 2 Is a partial sectional perspective view of one angle of the front view direction of the present invention; Figure 3 Is Figure 2 The enlarged partial view at A in Figure 4 Is a sectional perspective view of another angle of the front view direction of the present invention; Figure 5 Is Figure 4 The enlarged partial view at B in Figure 6 Is the front view sectional view of the present invention; Figure 7 Is the perspective view of the pretreatment device in the present invention; Figure 8 Is the partial sectional view of the pretreatment device in the present invention; Figure 9 Is Figure 8 The enlarged partial view at C in

[0030] Explanation of the Reference Numerals: 1. Multi-stage oven; 11. First partition; 12. First stage; 13. Second stage; 131. Second partition; 132. Circulating drying area; 133. Third partition; 134. Circulating drying chamber; 135. Ventilation hole; 14. Third stage; 141. Fourth partition; 142. High-temperature and high-humidity area; 143. Medium-temperature and medium-humidity area; 144. Low-temperature and low-humidity area; 15. Buffer section; 16. Guide roller; 17. Bandage inlet; 18. Bandage outlet; 2. Dehumidification device; 21. Moisture discharge pipe; 22. Circulating return pipe; 23. Suction port; 24. Moisture discharge motor; 25. Circulating motor; 3. Bandage body; 4. Hot air pipe; 5. Negative pressure branch pipe; 51. Negative pressure main pipe; 6. First rotating shaft; 61. Pressing plate; 7. Second rotating shaft; 71. First roller; 72. Spiral groove; 73. Transverse groove; 74. First slider; 75. Annular slot; 76. Insert block; 77. Top block; 78. Cutting knife; 79. Installation groove; 8. Fixed shaft; 81. Second roller; 82. Sliding sleeve; 83. Suction pipe; 84. Through hole; 85. Installation cavity; 86. Slide groove; 87. Second slider; 88. First spring; 89. Impurity suction pipe; 9. Tensioning roller; 91. Fixed seat; 92. Open slot; 93. Guide rod; 94. Second spring. Detailed implementation mode

[0031] The following is further detailed description of the present invention in conjunction with the attached Figures 1-9 drawings.

[0032] An embodiment of the present invention discloses a continuous drying and cooling integrated device for medical plaster bandages.

[0033] It should be noted that in the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and 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 should not be construed as a limitation to the present invention.

[0034] Referring to Figures 1-9 , a continuous drying and cooling integrated device for medical plaster bandages includes a multi-stage oven 1 and a dehumidification device 2 communicated with it. A plurality of first partitions 11 are sequentially arranged in the multi-stage oven 1, and the first partitions 11 divide the multi-stage oven 1 into a first stage 12, a second stage 13, a third stage 14 and a buffer section 15; a bandage inlet 17 for the bandage body 3 to enter is arranged at the bottom outside the first stage 12, a bandage outlet 18 is arranged at the bottom outside the third stage 14, and a hot air pipe 4 for introducing hot and humid air is arranged at the lower part of the first stage 12; A pretreatment device is arranged in the first section 12. The pretreatment device includes a second rotating shaft 7 and a fixed shaft 8 which are arranged in parallel. The front and rear ends of the second rotating shaft 7 are rotatably connected to the inner wall of the first section 12. A first roller 71 is fixedly arranged in the middle of the second rotating shaft 7. The fixed shaft 8 is located below the second rotating shaft 7 and its two ends are fixed to the inner wall of the first section 12. A second roller 81 which is rotationally matched with the fixed shaft 8 is correspondingly arranged in the middle of the fixed shaft 8. Sliding sleeves 82 are sleeved on the fixed shaft 8 on both sides of the second roller 81. An insertion block 76 which is horizontally arranged is detachably arranged on one side of the sliding sleeve 82 facing the second roller 81. The thickness of the insertion block 76 gradually decreases from one side of the sliding sleeve 82 to one side of the second roller 81. An annular slot 75 which is matched with the insertion block 76 is arranged on the side surface of the first roller 71. An installation groove 79 which penetrates outward is arranged in the annular slot 75. A cutting knife 78 is arranged in the installation groove 79. A top block 77 is fixedly arranged on the inner side of the cutting knife 78 facing inward. The inner side of the top block 77 abuts against the outer side surface of the insertion block 76. A return spring is arranged between the outer side of the top block 77 and the installation groove 79. A reciprocating driving mechanism for driving the sliding sleeve 82 to slide reciprocally is arranged on the first roller 71.

[0035] By adopting the above technical solution, the hot air pipe 4 is used to introduce humid and hot air into the first section 12 and maintain the stability of the humidity and temperature therein, so as to realize the initial humid and hot drying of the bandage. Specifically, the temperature of the first section 12 is 30 - 40 °C, and the humidity is maintained at 60% - 70%RH. Therefore, when the coated bandage body 3 enters the first section 12, due to the high penetration of the humid and hot air, the inside and outside of the plaster can be fully preheated, the rapid water loss on the surface of the plaster can be delayed, the premature hardening of the surface layer to form a "hard shell" can be avoided, so that the internal water can uniformly migrate through capillary action, the internal stress can be reduced, the risk of cracks can be lowered, and the phenomenon that the surface layer shrinks sharply, causing delamination or edge warping during drying with dry hot gas can also be avoided. At the same time, the specific heat capacity of the humid and hot air is relatively high, and the heat transfer efficiency is better than that of dry hot air, and the energy consumption is reduced at the same temperature. This part can remove 10% - 15% of the water in the bandage body 3. The humid and hot air can also form a humid and hot environment for preheating and drying inside, thereby reducing the risk of static electricity accumulation, avoiding the generation of static electricity leading to the adsorption of thread ends or fiber debris, forming local accumulation, avoiding uneven structure or rough surface after curing, and also avoiding the problem that the gypsum slurry is unevenly distributed on the base cloth due to static electricity, avoiding the formation of local thin or thick parts, and ensuring the mechanical properties after curing.

[0036] A pretreatment device is provided, which can cooperate with the first roller 71 and the second roller 81 to enable the bandage body 3 to pass between the first roller 71 and the second roller 81 during production, thereby driving the first roller 71 and the second roller 81 to rotate. The extrusion of the first roller 71 and the second roller 81 can evenly arrange the gypsum slurry, and can also extrude the bubbles in the gypsum slurry to avoid the problem of subsequent drying and bubbling, improving the quality of the bandage. At the same time, the extrusion of the first roller 71 and the second roller 81 can also increase the pores of the base cloth, which is not only easier to adhere to the gypsum slurry, reducing the problems of delamination or edge warping, but also can improve the penetration of the humid and hot air, further improving the effect of the initial stage of humid and hot drying. Then, the reciprocating drive mechanism is used to realize the reciprocating movement of the sliding sleeve 82 and the insertion block 76 in the axial direction, so that the blade 78 descends through the extrusion of the top block 77 to cut off the thread ends on both sides of the bandage body 3, avoiding the problems of thread end contamination of the bandage body 3 and affecting the quality of the subsequent finished product. After a single cut, the top block 77 and the cutter 78 are reset by the rebound of the return spring.

[0037] Optionally, the reciprocating drive mechanism is arranged in the installation cavity 85 provided in the sliding sleeve 82. A plurality of chutes 86 communicating with the installation cavity 85 are evenly arranged on the side of the installation cavity 85 away from the second roller 81. The chutes 86 are arranged axially. A second slider 87 matching the chutes 86 is correspondingly arranged on the second roller 81. A first spring 88 is sleeved outside the fixed shaft 8 between the second slider 87 and the inner wall of the installation cavity 85. On both sides of the first roller 71, a plurality of spiral grooves 72 are evenly arranged in the circumferential direction on the second rotating shaft 7. One end of a section of the spiral groove 72 is provided with a transverse groove 73 communicating with the other end of the adjacent spiral groove 72. A first slider 74 matching the spiral groove 72 and the transverse groove 73 is arranged on the sliding sleeve 82.

[0038] By adopting the above technical solution, when the first roller 71 rotates, it can drive the second rotating shaft 7 to rotate, so as to realize the movement of the sliding sleeve 82 along the axial outer side by the sliding of the first slider 74 in the spiral groove 72. When the first slider 74 moves into the transverse groove 73, the sliding sleeve 82 is reset under the action of the first spring 88, thereby realizing the reciprocating movement of the sliding sleeve 82.

[0039] Optionally, a through hole 84 is arranged in the fixed shaft 8. A suction pipe 83 communicating with the through hole 84 is arranged at the rear side of the fixed shaft 8. The suction pipe 83 is communicated with an external air extraction pump (not shown). A dust suction pipe 89 communicating with the through hole 84 is arranged on the fixed shaft 8 between the sliding sleeve 82 and the second roller 81. The free end of the dust suction pipe 89 extends to the gap between the first roller 71 and the second roller 81. The free end of the dust suction pipe 89 faces the blade.

[0040] By providing the straw 83, the through hole 84 and the impurity suction pipe 89, a negative pressure can be formed in the through hole 84 by using an external air extraction pump, and then the thread cut by the blade can be sucked into the impurity suction pipe 89, preventing the thread from falling into the first section 12 and contaminating the subsequent bandage body 3 passing through.

[0041] Optionally, a plurality of groups of second partition plates 131 are sequentially arranged in the second section 13, and the second partition plates 131 divide the second section 13 into a plurality of circulating drying zones 132; a plurality of groups of fourth partition plates 141 are sequentially arranged in the third section 14, and the fourth partition plates 141 divide the third section 14 into a high-temperature and high-humidity zone 142, a medium-temperature and medium-humidity zone 143, and a low-temperature and low-humidity zone 144 arranged in sequence; independent control hot air pipes 4 are provided at the lower parts of the first section 12, the high-temperature and high-humidity zone 142, the medium-temperature and medium-humidity zone 143, the low-temperature and low-humidity zone 144, and each circulating drying zone 132; a guide roller 16 for guiding the movement of the bandage body 3 is provided in the multi-section oven 1, the bandage body 3 can enter the second section 13 from the upper part of the first section 12, the bandage body 3 makes multiple turns back and forth between the circulating drying zones 132 on both sides of the second section 13, the bandage body 3 enters the high-temperature and high-humidity zone 142 from the lower part of the second section 13, the bandage body 3 can enter the medium-temperature and medium-humidity zone 143 from the upper part of the high-temperature and high-humidity zone 142, and enter the low-temperature and low-humidity zone 144 from the lower part of the medium-temperature and medium-humidity zone 143, and the bandage body 3 enters the buffer section 15 from the low-temperature and low-humidity zone 144 and exits from the bandage outlet 18.

[0042] By adopting the above technical solution, the independent control hot air pipes 4 can be used to introduce hot air with different humidity and temperature into the second section 13 and the third section 14 and maintain the stability of the humidity and temperature therein, so that the middle section of the bandage body 3 can be heated and dehumidified for drying, and the end section can be dried with gradient cooling and dehumidification. Through the rational layout of temperature and humidity, multi-dimensional optimization of the structural stability, mechanical properties, and energy-saving efficiency during the drying process of the plaster bandage is achieved, and pain points such as stress cracking, moisture return, and high energy consumption caused by sudden changes in temperature and humidity in the traditional process are solved, as follows: ‌Mid-section heating and dehumidification drying: the temperature of the left circulating drying zone 132 is 40°C, and the humidity is maintained at 60%-70%RH; the temperature of the right circulating drying zone 132 is 60°C, and the humidity is maintained at 20%-30%RH; the temperature difference between adjacent circulating drying zones 132 does not exceed 5°C, and the humidity difference does not exceed 5%RH. Therefore, when the bandage body 3 moves from the left circulating drying zone 132 to the right circulating drying zone 132, the ambient temperature gradually increases, while the humidity gradually decreases. On the one hand, the increase in temperature difference is used to increase the evaporation rate. On the other hand, the increase in temperature causes the moisture inside the material to expand, and combined with the low RH environment to form a "suction effect", driving deep moisture to migrate to the surface, thereby achieving the purpose of rapid drying; the setting of the guide roller 16 can enable the bandage body 3 to achieve multiple returns between the circulating drying zones 132 on the left and right sides, so that the bandage body 3 can achieve multiple returns in a single return. During the cycle, the environment first shifts from low temperature and high humidity to high temperature and low humidity, achieving "temperature increase and humidity reduction", thereby promoting the accelerated evaporation of moisture in the bandage body. Then, the environment shifts from high temperature and low humidity to low temperature and high humidity, achieving "temperature reduction and humidity increase", thereby avoiding condensation of moisture on the surface of the plaster and rewetting, while allowing the surface of the plaster to absorb moisture moderately, thereby avoiding the internal moisture from forming internal stress due to surface "locking". From the right side of the circulating drying zone 132 alone, the bandage body 3 can intermittently enter its interior for short-term rapid drying, thereby ensuring drying efficiency and avoiding agglomeration due to excessive drying time, thereby avoiding surface blistering and reducing the probability of mildew. Through temperature-humidity coupling control, low RH is used to accelerate dehydration in the heating stage, and high RH is used to prevent condensation and promote moisture redistribution in the cooling stage, taking into account both drying efficiency and drying quality. This section can remove 75% to 80% of moisture.

[0043] End gradient cooling, dehumidification and drying: the temperature in the high temperature and high humidity zone 142 is 60°C, and the humidity is maintained at 60%~70%RH; the temperature in the medium temperature and medium humidity zone 143 is 40-50°C, and the humidity is maintained at 40%~50%RH; the temperature in the low temperature and low humidity zone 144 is 30-40°C, and the humidity is maintained at 20%~30%RH. The bandage body 3 enters the high temperature and high humidity zone 142 from the right circulation drying zone 132. The surface humidity is increased while the temperature remains unchanged, thereby allowing its surface to absorb some moisture at the initial stage of entry, preventing the surface from hardening prematurely and hindering the discharge of internal moisture. Then, gradient cooling and dehumidification are used to promote the gradual diffusion of moisture from the inside to the outside, reducing the phenomenon of local undried or over-drying, avoiding shrinkage stress concentration, and preventing cracking and deformation. This section can remove the remaining 10%~15% moisture inside the bandage body 3.

[0044] Optionally, the circulating drying zone 132 is sequentially provided with a plurality of third partitions 133 , the third partitions 133 dividing the circulating drying zone 132 into a plurality of circulating drying chambers 134 , and the third partitions 133 are provided with vents 135 communicating with adjacent circulating drying chambers 134 .

[0045] By adopting the above technical solution, with the arrangement of the circulating drying chamber 134 and the vent holes 135, a small temperature difference and humidity difference can be formed between adjacent circulating drying chambers 134 in a single circulating drying zone 132, that is, the temperature gradually decreases from bottom to top, and the humidity gradually increases from bottom to top. Thus, a gradually drying environmental gradient is formed between the upper and lower layers in the circulating drying zone 132, enabling a temperature gradient change while the bandage body 3 is undergoing heating and cooling circulating drying, further improving the drying efficiency and drying quality.

[0046] Optionally, fixing seats 91 are provided on the front and rear inner walls of the high-temperature and high-humidity zone 142, the medium-temperature and medium-humidity zone 143, and the low-temperature and low-humidity zone 144. An opening groove 92 is provided on the fixing seat 91. A tension roller 9 for tensioning the bandage body 3 is arranged between the corresponding opening grooves 92. A guide rod 93 passing through the end of the tension roller 9 is fixedly arranged in the opening groove 92. A guide hole is correspondingly arranged on the tension roller 9. A second spring 94 is sleeved on the guide rod 93 between the tension roller 9 and the inner wall of the opening groove 92.

[0047] By adopting the above technical solution, the tension roller 9 and the second spring 94 can be used to tension the passing bandage body 3. By presetting the position of the fixing seat 91 and selecting the elastic modulus of the second spring 94, a tension force with a gradient decrease can be achieved in the advancing direction of the bandage. The preset tensions in actual use are generally 54N, 40N, and 18N respectively. Through high-temperature and high tension, anti-crease and excessive shrinkage are achieved. Through medium-temperature and medium tension, the shrinkage rates of the base fabric and the gypsum slurry are coordinated, reducing the risk of delamination. Through low-temperature and low tension, shaping and elimination of residual stress are achieved, thereby ensuring the quality of the bandage after cooling.

[0048] Optionally, the dehumidifying device 2 includes a dehumidifying box fixed above the multi-section oven 1. The lower end of the dehumidifying box is respectively communicated with the first section 12, the second section 13, and the third section 14 through air suction ports 23. A dehumidifying fan is arranged in the dehumidifying box. The air suction end of the dehumidifying fan is communicated with the air suction port 23, and the air exhaust end of the dehumidifying fan is communicated with a dehumidifying pipe 21 extending outside the dehumidifying box. A dehumidifying motor 24 for driving the dehumidifying fan is arranged at the rear side of the dehumidifying box.

[0049] Optionally, a circulating fan is further arranged in the dehumidifying box. The air suction end of the circulating fan is communicated with the air suction port 23, and the air exhaust end of the circulating fan is communicated with a circulating return pipe 22 extending into the first section 12. A circulating motor 25 for driving the circulating fan is arranged at the rear side of the dehumidifying box. The circulating return pipe 22 extends to the bandage inlet 17 and is located above the bandage body 3, and the circulating return pipe 22 is arranged downward.

[0050] By adopting the above technical solution, with the arrangement of the circulation fan and the circulation return pipe 22, part of the waste heat and water vapor can be introduced into the first section 12, achieving waste heat utilization, saving energy consumption, and at the same time reducing the water supplement in the first section 12, further saving costs; with the arrangement of the circulation return pipe 22, while assisting in drying the bandage body 3, an air curtain can be formed at the bandage inlet 17, thereby preventing external debris from entering through the bandage inlet 17 and contaminating the bandage body 3.

[0051] Optionally, first rotating shafts 6 are symmetrically arranged on the upper and lower sides of the bandage body 3 at the uppermost part of each circulation drying area 132. The first rotating shafts 6 are rotatably connected to the front and rear walls of the circulation drying area 132. Pressing plates 61 extending obliquely towards the bandage body 3 are fixedly arranged on the first rotating shafts 6. The ends of the pressing plates 61 are in contact with the surface of the bandage body 3, and torsion springs are arranged on the first rotating shafts 6.

[0052] By adopting the above technical solution, with the arrangement of the torsion springs, the first rotating shafts 6 and the pressing plates 61, the pressing plates 61 can be made to fit on the surface of the bandage body 3, thereby physically squeezing out the tiny air bubbles on the surface of the bandage body 3 before high-temperature drying, reducing the probability of blistering on the surface of the bandage body 3, and at the same time making the bandage body 3 repeatedly loosen and tighten, expanding the pores, so as to improve the removal of internal moisture.

[0053] Optionally, negative pressure branch pipes 5 are arranged in the first section 12, the high-temperature and high-humidity area 142, the medium-temperature and medium-humidity area 143 and the low-temperature and low-humidity area 144. A negative pressure main pipe 51 communicated with each negative pressure branch pipe 5 is fixedly arranged at the rear side of the multi-section oven 1. The negative pressure main pipe 51 is communicated with an external negative pressure fan.

[0054] By adopting the above technical solution, with the arrangement of the negative pressure branch pipes 5 and the negative pressure main pipe 51, a negative pressure environment can be formed on both sides where the bandage body 3 enters and exits, which can not only promote the removal of moisture, improve the drying efficiency, but also reduce the overflow of gypsum dust and maintain the surrounding production environment; at the same time, the layout of low temperatures at both ends can also form heat insulation for the intermediate high-temperature environment, thereby reducing energy consumption.

[0055] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A continuous drying and cooling integrated device for medical plaster bandages, characterized in that, It includes a multi-section oven and a dehumidifying device connected thereto. A plurality of first partitions are provided in the multi-section oven, and the first partitions divide the multi-section oven into a first section, a second section, a third section and a buffer section; a bandage inlet for the bandage body to enter is provided at the bottom outside the first section, a bandage outlet is provided at the bottom outside the third section, and a hot air pipe for introducing hot and humid air is provided at the lower part of the first section. A pretreatment device is provided in the first section. The pretreatment device includes a second rotating shaft and a fixed shaft arranged in parallel. The front and rear ends of the second rotating shaft are rotatably connected to the inner wall of the first section, and a first roller is fixedly provided in the middle of the second rotating shaft; the fixed shaft is located below the second rotating shaft and its two ends are fixed to the inner wall of the first section, and a second roller rotatably matched with it is correspondingly provided in the middle of the fixed shaft. Sliding sleeves are sleeved on the fixed shaft on both sides of the second roller, and horizontally arranged insertion blocks are detachably provided on one side of the sliding sleeve facing the second roller. The thickness of the insertion block gradually decreases from one side of the sliding sleeve to one side of the second roller; an annular slot matched with the insertion block is provided on the side surface of the first roller, and an installation groove communicating with the outside is provided in the annular slot. A cutting knife is provided in the installation groove, a top block is fixedly provided on the inner side of the cutting knife facing inwards, the inner side of the top block abuts against the outer side surface of the insertion block, and a return spring is provided between the outer side of the top block and the installation groove; a reciprocating driving mechanism for driving the sliding sleeve to reciprocate is provided on the first roller.

2. The continuous drying and cooling integrated equipment for medical plaster bandages according to claim 1, characterized in that, The reciprocating driving mechanism reciprocally drives an installation cavity provided in the sliding sleeve. A plurality of chutes communicating with it are uniformly arranged on one side of the installation cavity away from the second roller. The chutes are arranged axially, and second sliders matched with the chutes are correspondingly provided on the second roller. A first spring is sleeved on the fixed shaft between the second slider and the inner wall of the installation cavity; a plurality of sections of spiral grooves are uniformly arranged in the circumferential direction on the second rotating shaft on both sides of the first roller. One end of a section of spiral groove is provided with a transverse groove communicating with the other end of the adjacent spiral groove, and a first slider matched with the spiral groove and the transverse groove is provided on the sliding sleeve.

3. The continuous drying and cooling integrated device for medical plaster bandages according to claim 2, wherein, A through hole is provided in the fixed shaft, a suction pipe communicating with the through hole is provided at the rear side of the fixed shaft, the suction pipe is communicated with an external air extraction pump, and a dust suction pipe communicating with the through hole is provided on the fixed shaft between the sliding sleeve and the second roller.

4. The continuous drying and cooling integrated equipment for medical plaster bandages according to claim 3, characterized in that, Multiple groups of second partitions are arranged in sequence in the second section, and the second partitions divide the second section into multiple circulation drying zones; multiple groups of fourth partitions are arranged in sequence in the third section, and the fourth partitions divide the third section into a high-temperature and high-humidity zone, a medium-temperature and medium-humidity zone and a low-temperature and low-humidity zone arranged in sequence; the first section, the high-temperature and high-humidity zone, the medium-temperature and medium-humidity zone, the low-temperature and low-humidity zone and the lower part of each circulation drying zone are all provided with independently controlled hot air ducts; the multi-section oven is provided with guide rollers for guiding the movement of the bandage body, the bandage body can enter the second section from the upper part of the first section, the bandage body can make multiple turns between the circulation drying zones on both sides of the second section, the bandage body enters the high-temperature and high-humidity zone from the lower part of the second section, the bandage body can enter the medium-temperature and medium-humidity zone from the upper part of the high-temperature and high-humidity zone, and enter the low-temperature and low-humidity zone from the lower part of the medium-temperature and medium-humidity zone, the bandage body enters the buffer section from the low-temperature and low-humidity zone and passes through the bandage outlet.

5. The continuous drying and cooling integrated device for medical plaster bandage according to claim 4, characterized in that, The circulating drying zone is sequentially provided with a plurality of third partitions, the third partitions divide the circulating drying zone into a plurality of circulating drying chambers, and the third partitions are provided with vents communicating with adjacent circulating drying chambers.

6. The continuous drying and cooling integrated device for medical plaster bandages according to claim 5, characterized in that, Fixed seats are provided on the front and rear inner walls of the high-temperature and high-humidity zone, the medium-temperature and medium-humidity zone, and the low-temperature and low-humidity zone. Open grooves are provided on the fixed seats. Tensioning rollers for tensioning the bandage body are provided between the corresponding open grooves. A guide rod passing through the end of the tensioning roller is fixedly provided in the open groove. A guide hole is correspondingly provided on the tensioning roller. A second spring is sheathed on the guide rod between the tensioning roller and the inner wall of the open groove.

7. An integrated device for continuously drying and cooling medical plaster bandages according to claim 6, characterized in that, The dehumidification device includes a dehumidification box fixed above the multi-stage oven, and the lower end of the dehumidification box is connected to the first section, the second section and the third section respectively through the air suction port; a dehumidification fan is provided in the dehumidification box, the air suction end of the dehumidification fan is connected to the air suction port, and the air discharge end of the dehumidification fan is connected to the dehumidification pipe extending outside the dehumidification box, and a dehumidification motor for driving the dehumidification fan is provided on the rear side of the dehumidification box.

8. The continuous drying and cooling integrated device for medical plaster bandages according to claim 7, characterized in that, A circulating fan is also provided in the dehumidification box. The suction end of the circulating fan is connected to the suction port, and the exhaust end of the circulating fan is connected to a circulating return pipe extending into the first section. A circulating motor for driving the circulating fan is provided on the rear side of the dehumidification box; the circulating return pipe extends to the bandage inlet and is located above the bandage body, and the circulating return pipe is arranged downward.

9. An integrated device for continuously drying and cooling medical plaster bandages according to claim 8, characterized in that, A first rotating shaft is symmetrically arranged on the upper and lower sides of the bandage body at the top of each circulation drying zone. The first rotating shaft is rotatably connected to the front and rear walls of the circulation drying zone. A pressure plate is fixed on the first rotating shaft and extends obliquely toward the bandage body. The end of the pressure plate contacts the surface of the bandage body. A torsion spring is arranged on the first rotating shaft.

10. The continuous drying and cooling integrated device for medical plaster bandage according to claim 9, characterized in that, The first section, the high temperature and high humidity zone, the medium temperature and medium humidity zone, and the low temperature and low humidity zone are all provided with negative pressure branches. A negative pressure main pipe connected to each negative pressure branch pipe is fixedly provided on the rear side of the multi-section oven, and the negative pressure main pipe is connected to an external negative pressure fan.

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