A temperature uniformity control device for low temperature circulating grain dryer

Abstract

The present invention relates to the field of drying technology, and specifically to a temperature uniformity control device for a low-temperature circulating grain dryer, the temperature uniformity control device comprising a shell, a partition, a fan, a heater, an adjusting component, a double-headed screw, a stretching component, a sleeve and a duct, the shell is connected to the front end of an inner cavity of the outer shell, the partition is connected to the middle of the inner cavity of the shell, and the inner cavity of the shell is divided into a hot air chamber and a cold air chamber, two groups of fans are respectively connected to the lower ends of the hot air chamber and the cold air chamber, the heater is connected to the lower side of the hot air chamber, the adjusting component is connected to the upper side of the cold air chamber, the double-headed screw is connected to the upper side of the adjusting component, and the stretching component is connected to the outer wall of the double-headed screw in a spiral array. The present invention adjusts the shape of the sleeve according to the air intake amount of the cold air, so that the sleeve forms a flow channel with staggered diameters when the air flow rate is small, and the mixing effect is ensured by extending the flow channel when the air flow rate is large.

Description

Technical Field

[0001] The invention relates to the technical field of drying, in particular to a temperature uniformity control device for a low-temperature circulating grain dryer. Background Art

[0002] Drying is one of the important processing links of grains, which aims to reduce the moisture in the grains and increase the shelf life of the grains. Compared with individual households that dry grains by drying them in the sun, grain manufacturers mainly use dryers to dry grains. Due to the demand for the quality of grains after drying, grain manufacturers will use low-temperature circulating grain dryers to dry grains. Low-temperature circulating grain dryers dry grains at low temperatures, large air volumes and by increasing the slow-suction ratio, which effectively ensures the quality of the grains. The temperature uniformity control device is the key part to ensure that the low-temperature circulating grain dryer dries the grains at low temperatures.

[0003] The working principle of the temperature uniformity control device is to set up two air flow channels, and set up an open flame in one of the air flow channels. When the air flow flows, it comes into contact with the open flame, thereby causing the air flow to heat up and form a hot air flow. The hot air flow rises and comes into contact with and mixes with the unheated air flow in the other channel. The mixed air flow is at a suitable drying temperature, and at the same time, the mixed air flow rate is maintained at a specified size, thereby drying the grain. The ambient temperature after the autumn harvest in high-latitude areas is relatively low, which in turn makes the temperature of the unheated air flow relatively low. At this time, the injection amount of the unheated air flow will be reduced and the injection amount of the hot air flow will be increased. However, the temperature difference between the hot air flow and the unheated air flow is large, resulting in a longer mixing time for the hot air flow and the unheated air flow. The grain dryer needs to maintain an appropriate air volume, so it is necessary to keep the hot air flow and the unheated air flow at a faster flow rate. The high-speed hot air flow and the unheated air flow quickly flow into the inner cavity of the low-temperature circulating grain dryer. The contact time between the hot air flow and the unheated air flow is short, resulting in poor mixing effect of the hot air flow and the unheated air flow in the flow channel, and then making the temperature of the mixed air flow uneven, affecting the drying effect of the grain; in the prior art, fan blades are set to improve the mixing effect of the hot air flow and the unheated air flow, and the unheated air flow and the hot air flow are dispersed by the rotation of the fan blades, thereby The purpose of uniform mixing is achieved. However, in valley areas, the ambient temperature at night is further reduced, and the temperature difference between the hot air flow and the unheated air flow is further increased. The volume of the hot air flow and the unheated air flow dispersed by the fan blades is fixed. When the temperature difference is further increased, it takes a long time for the hot air flow and the unheated air flow to mix. The length of the mixing channel for the hot air flow and the unheated air flow is limited, which leads to a limited intersection time of the dispersed hot air flow and the unheated air flow. The mixing effect of the hot air flow and the unheated air flow in the channel is poor, resulting in uneven temperature of the mixed air flow, which affects the effect on the grains.

[0004] Therefore, a temperature uniformity control device for a low-temperature circulating grain dryer is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a temperature uniformity control device for a low-temperature circulating grain dryer, which solves the problem that when the ambient temperature is low, the temperature difference between the cold and hot air flows is large, which causes uneven mixing of the cold and hot air flows, thereby affecting the poor grain drying effect; by changing the shape of the pipeline through the change of the air intake volume in the cold air chamber, when the air flow rate is small, the air flow passes through a sleeve with alternating diameters, so that the air flow continuously diffuses and gathers when it flows, thereby achieving a good mixing effect; when the air flow rate is large, the flow channel is extended to ensure the mixing time, thereby ensuring the mixing effect.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A temperature uniformity control device for a low-temperature circulation grain dryer, the temperature uniformity control device is applied to the low-temperature circulation grain dryer, the low-temperature circulation grain dryer comprises a shell, a feeding device, a temperature uniformity control device and a drying device, the temperature uniformity control device and the drying device are respectively connected to the front and rear sides of the inner cavity of the shell, the temperature uniformity control device comprises a shell, a partition, a fan, a heater, an adjustment component, a double-headed screw, a stretching component, a sleeve and a conduit, the shell is connected to the front end of the inner cavity of the shell, the partition is connected to the middle of the inner cavity of the shell, and the inner cavity of the shell is divided into a hot air cavity and a Cold air chamber, the two groups of fans are respectively connected to the lower ends of the hot air chamber and the cold air chamber, the heating machine is connected to the lower side of the hot air chamber, the adjusting component is connected to the upper side of the cold air chamber, the double-headed screw is connected to the upper side of the adjusting component, the stretching component is connected to the outer wall of the double-headed screw, the sleeve is connected to the stretching component, and the two ducts are respectively connected to the upper side of the stretching components at both ends, when air flows in the cold air chamber, the adjusting component drives the double-headed screw to rotate, and the rotation amplitude of the double-headed screw is positively correlated with the intensity of the cold air flow, and the stretching component adjusts the pulling force on the end of the sleeve according to the rotation amplitude of the double-headed screw.

[0008] Through the above scheme, the cold air flow and the hot air flow can be evenly mixed, thereby effectively ensuring the drying effect of the grain in the drying device. At the same time, during the flow of the hot air flow, the setting of the partition can reduce the moisture contained in the hot air flow, thereby further improving the drying effect.

[0009] Preferably, the partition member includes a partition, a baffle, a drain plate and a fin, the partition is connected to the lower side of the middle part of the shell cavity, the baffle is connected to the upper end of the partition, the drain plate and the fin are respectively connected to the front and rear sides of the baffle, and the lower side of the baffle is arc-shaped.

[0010] Through the above scheme, the baffle is set in an arc shape, so that the hot air flow will contact the baffle when it rises. By setting the fins in the cold air chamber, the temperature of the baffle is transferred by the fins to the baffle, so that the temperature of the baffle is lower. Then, when the hot air flow contacts the baffle, condensed water can be formed, thereby effectively reducing the moisture in the hot air flow, thereby achieving the purpose of improving the dryness of the air flow.

[0011] Preferably, the adjustment assembly includes a slide plate, a tooth plate, a gear, a notch, a spring and a limit plate, the slide plate is connected to the rear side of the inner cavity of the shell, the tooth plate is connected to the top of the slide plate, the gear is meshed on the upper side of the tooth plate, the gear is connected to the double-headed screw, the notch is opened on the outside of the slide plate, the lower end of the spring is connected to the bottom end of the notch, the limit plate is connected to the upper end of the spring, and the lower side of the slide plate is arc-shaped.

[0012] Through the above scheme, when cold wind flows upward, the cold wind acts on the lower side of the skateboard, thereby generating thrust on the skateboard, setting the lower side of the skateboard in an arc shape, thereby effectively increasing the wind-receiving area of ​​the lower side of the skateboard, making it easier for the wind to push the skateboard upward.

[0013] Preferably, the slide plate includes a plate body, a rectangular groove, an axle rod and an eccentric piece, the plate body is connected to the upper end of the rear side of the inner cavity of the shell, the rectangular groove array is opened at the front end of the plate body, the axle rod passes through the rectangular groove, the eccentric piece array is connected to the axle rod, and the position of the eccentric piece corresponds to the position of the rectangular groove.

[0014] Through the above solution, the eccentric piece corresponds to the rectangular groove, thereby providing the eccentric piece with a rotation space. The rotation of the eccentric piece changes the wind receiving area of ​​the plate body, thereby achieving the purpose of moving the plate body up and down.

[0015] Preferably, the eccentric member includes an eccentric plate and blades, the eccentric plate is connected to the shaft, blades are connected between two adjacent eccentric plates, the blades are inclined, and a farthest point m is provided on the eccentric plate, and the farthest point m contacts the inner wall of the fin during rotation.

[0016] Through the above scheme, the farthest point m contacts the inner wall of the fin during rotation, and then contacts the fin during the rotation of the eccentric member, causing the fin to vibrate slightly, and the vibration is transmitted to the baffle, thereby removing condensed water on the surface of the baffle.

[0017] Preferably, the stretching assembly includes a sleeve, a ring and a connecting frame, the sleeve is connected to the upper end of the shell, the double-headed screw is connected to the middle of the sleeve, the ring spiral array is connected to the surface of the double-headed screw, the sleeve is connected between two adjacent rings, the connecting frame is connected to the middle of the sleeve, and the lower end of the connecting frame is connected to the hot air chamber and the cold air chamber.

[0018] Through the above solution, the rings are connected in a spiral array, so that the sleeves connected between the two rings are arranged in a spiral shape, thereby achieving the purpose of making the airflow flow in a spiral shape.

[0019] Preferably, the sleeve includes an expansion section and a contraction section, the expansion section is located at both ends of the contraction section, and one end of the expansion section away from the contraction section is connected to the ring, the diameter of the contraction section is smaller than the diameter of the expansion section, and the sleeve is made of rubber material.

[0020] Through the above scheme, the diameter value of the contraction section is smaller than the diameter value of the expansion section, thereby forming a flow duct with staggered diameters when the cold and hot air flows, thereby improving the mixing effect of the cold and hot air flows. At the same time, the sleeve is made of elastic material and can be pulled. After pulling, the diameter value of the contraction section is expanded, thereby reducing the impact of the wind flow on the sleeve.

[0021] Preferably, the sleeve includes a connecting sleeve, a ring body, a retaining ring and a through hole, the connecting sleeve is connected to the double-headed screw, the ring body is connected to the connecting sleeve, the retaining ring is connected to the inner wall of the ring body, the through hole array is opened on the circumferential surface of the ring body, and the retaining ring is provided with an annular groove on the windward side.

[0022] Through the above scheme, when the baffle ring is exposed to wind, condensed water can be collected and discharged through the through hole, thereby improving the dryness of the mixed airflow.

[0023] Preferably, the pitch of the thread groove on the surface of the double-headed screw gradually increases from the inside to the outside, the inner wall of the connecting sleeve is connected to a slider, the slider is arranged in the thread groove on the surface of the double-headed screw, and the inner wall of the sleeve frame is provided with a slot connected to the ring body.

[0024] Through the above scheme, the setting of the slot can limit the ring body, and then when the double-headed screw rotates, the ring body slides horizontally in the slot, thereby achieving the purpose of adjusting the ring body spacing and thus realizing the tightening of the sleeve.

[0025] Preferably, the two conduits are respectively connected to the upper end of the outer ring body, the conduits penetrate the sleeve frame and are slidably connected to the sleeve frame, and the upper sides of the two conduits are connected to U-shaped plates, and the openings of the U-shaped plates are opposite to each other.

[0026] Through the above scheme, the U-shaped plate can change the flow of the airflow, thereby causing the airflows on both sides to collide. On the one hand, the collision of the airflows expands the total flow area of ​​the airflows and disperses the airflows, thereby facilitating the diffusion flow of the airflows. On the other hand, the collision of the airflows further improves the mixing effect of the airflows.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention solves the problem that when the ambient temperature is low, the temperature difference between the cold and hot air flows is large, which causes uneven mixing of the cold and hot air flows, thereby affecting the poor grain drying effect. By setting a sleeve and stretching the sleeve to arrange the sleeve in a spiral shape, the cold air flow inlet is set on the side close to the double-headed screw, and the hot air flow inlet is set on the side away from the double-headed screw. When the cold and hot air flows in a spiral shape, the cold air flow is affected by the centrifugal force, and the heavier cold air begins to move away from the double-headed screw, and then the cold and hot air flows meet in the sleeve, thereby achieving the purpose of good mixing effect.

[0029] 2. By setting the sleeve, the sleeve is divided into a contraction section and an expansion section with different diameter values. When the cold and hot air flows, they are affected by the sleeve with changing diameter, and continuously expand and contract in the pipe, thereby achieving the purpose of good mixing effect. At the same time, when the flow rate of the cold air flow is large, the regulating component will be pushed upward to make the stretching component straighten the sleeve, thereby reducing the diameter change range of the contraction section and the expansion section, so that the airflow flows stably. At the same time, the sleeve is pulled to both sides to extend the total length of the sleeve, thereby ensuring the mixing time of the cold and hot air flows, and achieving the purpose of good mixing effect.

[0030] 3. By setting a baffle, the baffle is set at the upper end of the hot air flow channel, and then when the hot air flow flows, it will contact the baffle to form condensed water. Fins are set on the rear side of the baffle. The fins are in contact with the baffle to keep the baffle at a low temperature, thereby effectively removing moisture in the hot air flow. At the same time, the flow of the cold air flow causes the eccentric part to rotate, and the rotation of the eccentric part contacts the wall of the fin groove, thereby impacting the fin, achieving the purpose of making the fin shake, and then making the baffle shake, effectively removing the condensed water covering the surface of the baffle, thereby facilitating the further adhesion of the condensed water, thereby improving the dryness of the hot air flow, and achieving the purpose of improving the grain drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the temperature uniformity control device of the present invention;

[0033] Figure 3 It is a schematic structural diagram of the partition part of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the regulating component part of the present invention;

[0035] Figure 5 It is a structural schematic diagram of the slide plate part of the present invention;

[0036] Figure 6 It is a schematic structural diagram of the stretching component part of the present invention;

[0037] Figure 7 For the present invention Figure 6 A magnified schematic diagram of point A;

[0038] Figure 8 It is a structural schematic diagram of the sleeve frame part of the present invention;

[0039] Fig. 9 It is a schematic diagram of the airflow direction of the present invention.

[0040] In the figure: a, shell; b, feeding device; c, temperature uniformity control device; d, drying device; 1, shell; 101, hot air chamber; 102, cold air chamber; 2, partition; 201, partition; 202, baffle; 203, guide plate; 204, fin; 3, fan; 4, heating machine; 5, adjustment component; 501, slide plate; 5011, plate body; 5012, rectangular groove; 5013, shaft; 5014, eccentric piece; 50141, eccentric plate; 50142, blade Plate; 502, tooth plate; 503, gear; 504, notch; 505, spring; 506, limit plate; 6, double-headed screw; 7, stretching assembly; 701, sleeve; 7011, slot; 702, collar; 7021, connecting sleeve; 70211, slider; 7022, ring body; 7023, retaining ring; 7024, through hole; 7025, annular groove; 703, connecting frame; 8, sleeve; 801, expansion section; 802, contraction section; 9, catheter; 10, U-shaped plate. DETAILED DESCRIPTION

[0041] The following is a clear and complete description of the technical solution of the embodiment of the present invention in conjunction with the drawings of the embodiment of the present invention, so that its working state and structural features are more detailed. Obviously, the described embodiment is only a partial embodiment of the present invention, not a complete embodiment. Based on the embodiment of the present invention, other embodiments obtained by ordinary technicians in this field without making any creativity belong to the protection scope of the present invention.

[0042] See also Figures 1 to 9 The present invention provides a temperature uniformity control device for a low-temperature circulating grain dryer, and the technical solution is as follows:

[0043] For details, please refer to Figures 1 to 9, a temperature uniformity control device for a low-temperature circulating grain dryer, the temperature uniformity control device c is applied to a low-temperature circulating grain dryer, the low-temperature circulating grain dryer comprises a shell a, a feeding device b, a temperature uniformity control device c and a drying device d, the feeding device b is connected to the front end of the shell a, the temperature uniformity control device c is connected to the front side of the inner cavity of the shell a, the drying device d is connected to the rear end of the inner cavity of the shell a, the temperature uniformity control device c is located at the front end of the drying device d, the feeding device b lifts the grain into the drying device d, the temperature uniformity control device c comprises a shell 1, a partition 2, a fan 3, a heating machine 4, an adjustment component 5, a double-headed screw 6, a stretching component 7, a sleeve 8 and a conduit 9, the shell 1 is connected to the front end of the inner cavity of the shell a, the shell 1 is fixedly connected to the shell a, the partition 2 is connected to the middle of the inner cavity of the shell 1, and The inner cavity of the shell 1 is divided into a hot air cavity 101 and a cold air cavity 102, the hot air cavity 101 is at the front side of the cold air cavity 102, the two groups of fans 3 are respectively connected to the lower ends of the hot air cavity 101 and the cold air cavity 102, the wind generated by the fans 3 flows from bottom to top, the heating machine 4 is connected to the lower side of the hot air cavity 101, there is a gap between the heating machine 4 and the fans 3, the adjusting component 5 is connected to the upper side of the cold air cavity 102, the double-headed screw 6 is connected to the upper side of the adjusting component 5, the stretching component 7 is connected to the outer wall of the double-headed screw 6, the sleeve 8 is connected to the stretching component 7, and the two conduits 9 are respectively connected to the upper sides of the stretching components 7 at both ends, when the airflow flows in the cold air cavity 102, the adjusting component 5 drives the double-headed screw 6 to rotate, and the rotation amplitude of the double-headed screw 6 is positively correlated with the intensity of the cold air flow, and the stretching component 7 pulls the end of the sleeve 8 according to the rotation amplitude of the double-headed screw 6.

[0044] By setting the fan 3, the fan 3 rotates to generate an airflow flowing from bottom to top. The two groups of fans 3 are respectively located in the cold air chamber 102 and the hot air chamber 101. Since the lower end of the hot air chamber 101 is connected to the heating machine 4, the airflow forms a hot air flow when passing through the hot air chamber 101, and a cold air flow is formed in the cold air chamber 102. The cold air flow and the hot air flow are collected in the duct 9, and the duct 9 is arranged in a spiral shape through the stretching component 7. The cold air flow and the hot air flow are affected by the spirally discharged duct 9 during the flow process to form a spiral flow channel, and the cold air flow is close to the inner side of the flow channel. During the flow process, the heavier cold air flow is affected by the centrifugal force, and the cold air flow deviates outward and then intersects with the hot air flow, thereby achieving the purpose of making the temperature of the drying air flow uniform. At the same time, when the cold air flow increases, it will push the adjusting component 5 to move upward, so that the stretching component 7 pulls the duct 9, so that the length of the duct 9 is increased, thereby increasing the length of the flow channel, which is convenient for the cold air flow to mix evenly with the hot air flow.

[0045] As an embodiment of the present invention, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Fig. 9The partition member 2 includes a partition 201, a baffle 202, a guide plate 203 and a fin 204. The partition 201 is connected to the lower side of the middle part of the inner cavity of the shell 1, and the baffle 202 is connected to the upper end of the partition 201. The baffle 202 cooperates with the partition 201 to separate the inner cavity of the shell 1 into a hot air cavity 101 and a cold air cavity 102. The guide plate 203 and the fin 204 are respectively connected to the front and rear sides of the baffle 202. The baffle 202 is arc-shaped, and the upper end of the baffle 202 is biased toward the hot air cavity 101, so that when the hot air flow moves upward, it will contact the baffle 202. The lower side of the guide plate 203 is arc-shaped, and when the hot air flow flows upward, it will contact the arc surface of the lower side of the guide plate 203, so that the air flow is gathered and concentrated. The regulating component 5 comprises a slide plate 501, a tooth plate 502, a gear 503, a notch 504, a spring 505 and a limit plate 506, wherein the slide plate 501 is connected to the rear side of the inner cavity of the housing 1, the tooth plate 502 is connected to the top of the slide plate 501, the tooth plate 502 extends to the upper end of the housing 1, the gear 503 is meshed with the tooth plate 502, and then the gear 503 can be driven to rotate when the tooth plate 502 moves up and down, the gear 503 is connected to the double-headed screw 6, the gear 503 is fixedly connected to the double-headed screw 6, and then the double-headed screw 6 can be driven to rotate when the gear 503 rotates, the notch 504 is provided on the outer side of the slide plate 501, the lower end of the spring 505 is connected to the bottom end of the notch 504, and the limit plate 506 is connected to the upper end of the spring 505 In the initial state of the spring 505, the upper side of the limit plate 506 fits with the upper side of the slot 504, the limit plate 506 is slidably connected to the slot 504, the limit plate 506 is fixedly connected to the shell 1, the lower side of the slide plate 501 is arc-shaped, thereby increasing the total area of ​​the lower side of the slide plate 501, thereby facilitating the wind force to push the slide plate 501 upward, the slide plate 501 includes a plate body 5011, a rectangular slot 5012, a shaft rod 5013 and an eccentric piece 5014, the plate body 5011 is connected to the upper end of the rear side of the inner cavity of the shell 1, the plate body 5011 is slidably connected to the shell 1, the lower side of the plate body 5011 is arc-shaped, the rectangular slot 5012 array is opened at the front end of the plate body 5011, the rectangular slot 5012 corresponds to the gap between the fins 204, The shaft 5013 passes through the rectangular groove 5012, and the eccentric member 5014 array is connected to the shaft 5013, and the position of the eccentric member 5014 corresponds to the position of the rectangular groove 5012. The eccentric member 5014 is located between the gap between the rectangular groove 5012 and the fin 204, so that the eccentric member 5014 can rotate. The eccentric member 5014 includes an eccentric plate 50141 and a blade 50142. The eccentric plate 50141 is connected to the shaft 5013, and a blade 50142 is connected between two adjacent eccentric plates 50141. The blade 50142 is inclined, so that the wind receiving area of ​​the blade 50142 is large, which is convenient for the wind to blow the blade 50142 to rotate. The farthest point m is set on the eccentric plate 50141.The farthest point m contacts the inner wall of the fin 204 during rotation.

[0046] By setting the baffle 202, the baffle 202 is arc-shaped, and when the airflow in the hot air chamber 101 moves upward after being heated, the heated airflow will contact the baffle 202, and the fin 204 is attached to the back side of the baffle 202, and the fin 204 is in the cold air chamber 102. The flow of cold air will cool the fin 204, and the fin 204 fits the baffle 202, so that the temperature of the fin 204 is low, which in turn reduces the temperature of the baffle 202, and the hot air flow acts on the cold baffle 202, thereby achieving the purpose of forming condensed water. The moisture in the hot air flow is effectively removed, and the drying effect of the low-temperature circulating grain dryer is improved. At the same time, the setting of the adjustment component 5 is adjusted. When the cold air flow increases, the slide plate 501 will push the tooth plate 502 upward, thereby driving the gear 503 to rotate. The rotation of the gear 503 drives the stretching component 7 to rotate, thereby adjusting the length of the sleeve 8. When the cold air flow flows, part of the air flow will pass through the gap of the fin 204 and act on the eccentric piece 5014, which is affected by the blade 50142, and then the cold air flow pushes the eccentric piece 5014 to rotate. When the eccentric piece 5014 rotates, it will rub against the fin 204, causing the fin 204 to vibrate slightly. The vibration of the fin 204 is transmitted to the baffle 202, which in turn causes the baffle 202 to vibrate slightly, thereby effectively removing the condensed water on the surface of the baffle 202. At this time, the empty baffle 202 is convenient for the condensed water to condense again. At the same time, when the eccentric piece 5014 rotates, the area of ​​the eccentric piece 5014 in the gap of the fin 204 will change, thereby changing the wind receiving area of ​​the slide plate 501. When the area of ​​the eccentric piece 5014 in the gap of the fin 204 is small, the thrust of the wind on the skateboard 501 is reduced, and the skateboard 501 moves slightly downward. When the area of ​​the eccentric piece 5014 in the gap of the fin 204 is large, the thrust of the wind on the skateboard 501 is increased, and the skateboard 501 moves slightly upward. As a result, the skateboard 501 moves slightly up and down when the eccentric piece 5014 rotates, and the double-headed screw 6 rotates slightly, thereby achieving the purpose of adjusting the sleeve 8, thereby improving the mixing effect of the cold airflow and the hot airflow.

[0047] As an embodiment of the present invention, refer to Figure 6 , Figure 7 , Figure 8 and Fig. 9The stretching assembly 7 includes a sleeve frame 701, a sleeve ring 702 and a connecting frame 703. The sleeve frame 701 is connected to the upper end of the shell 1, and the sleeve frame 701 is fixedly connected to the shell 1. The double-headed screw 6 is connected to the middle of the sleeve frame 701, and the double-headed screw 6 is rotatably connected to the sleeve frame 701. The tooth plate 502 extends to the inner cavity of the sleeve frame 701 and is rotatably connected to the sleeve frame 701. The sleeve ring 702 is connected to the surface of the double-headed screw 6 in a spiral array. The sleeve 8 is connected between two adjacent sleeve rings 702. The connecting frame 703 is connected to the middle of the sleeve frame 701. The lower end of the connecting frame 703 is connected to the hot air chamber 101 and the cold air chamber 102. The upper end of the connecting frame 703 is connected to the sleeve The sleeve 8 is connected to the connecting frame 703, and when the cold air flow rises, it is located at the rear side of the connecting frame 703, while when the hot air flow rises, it is located at the front side of the connecting frame 703. The sleeve 8 includes an expansion section 801 and a contraction section 802. The expansion section 801 is located at both ends of the contraction section 802, and one end of the expansion section 801 away from the contraction section 802 is connected to the collar 702. The diameter value of the contraction section 802 is smaller than the diameter value of the expansion section 801, and then a plurality of sleeves 8 form a flow channel with staggered diameter changes, so that when the cold and hot air flows, they are affected by the flow channel with staggered diameter changes, forming turbulence, thereby improving the mixing effect of the cold and hot air flows. The sleeve 8 is made of rubber material, and the sleeve 8 can withstand a certain amount of heat (only when Figure 77023 is connected to the inner wall of the ring body 7022, and the through holes 7024 are arranged on the circumference of the ring body 7022. An annular groove 7025 is provided on the windward side of the baffle ring 7023, so that the airflow flows on the surface of the sleeve 8 to form condensed water. The condensed water is affected by the wind and approaches the baffle plate 202. An annular groove 7025 is provided on the windward side of the baffle ring 7023, so that the condensed water is collected in the annular groove 7025 and discharged through the through hole 7024. The pitch of the thread groove on the surface of the double-headed screw 6 gradually increases from the inside to the outside. The inner wall of the connecting sleeve 7021 is connected with a slider 70211, and the slider 70211 is arranged in the thread groove on the surface of the double-headed screw 6. The slider 70211 is axially slidably connected with the connecting sleeve 7021, and then when the double-headed screw 6 rotates, the slider 70211 can adapt to the pitch of the thread groove on the surface of the double-headed screw 6 by adjusting its position. The inner wall of the sleeve frame 701 is provided with a slot 7011, and the slot 7011 is connected to the ring body 7022. When the double-headed screw 6 rotates slightly, the ring 702 will pull the sleeve 8, thereby deforming the surface of the sleeve 8 to facilitate the flow and collection of condensed water. The two conduits 9 are respectively connected to the upper ends of the outer ring body 7022, and the conduits 9 pass through the sleeve frame 701 and are slidably connected to the sleeve frame 701. The upper sides of the two conduits 9 are connected with U-shaped plates 10, and the openings of the U-shaped plates 10 are opposite to each other.

[0048] By setting the stretching component 7, the length of the sleeve 8 can be changed. By moving the tooth plate 502 upward, the gear 503 drives the double-headed screw 6 to rotate. When the double-headed screw 6 rotates, the ring body 7022 is limited by the clamping groove 7011, and the connecting sleeve 7021 moves horizontally on the surface of the double-headed screw 6. Since the pitch of the thread groove on the surface of the double-headed screw 6 gradually increases from the inside to the outside, the connecting sleeve 7021 near the inside moves a shorter distance, while the connecting sleeve 7021 near the outside moves a longer distance, thereby achieving the pulling of the sleeve 8. On the one hand, pulling the sleeve 8 can make the length of the sleeve 8 longer, thereby extending the cold air flow and The mixing time of the hot air flow, on the other hand, makes the contraction section 802 open, thereby reducing the difference in diameter between the contraction section 802 and the expansion section 801, reducing the variation range of the flow channel diameter formed by the sleeve 8, thereby reducing the impact force of the airflow on the sleeve 8. The U-shaped plate 10 can change the flow direction of the airflow, thereby causing the airflows on both sides to collide. On the one hand, the collision of the airflow expands the total flow area of ​​the airflow, disperses the airflow, and facilitates the diffusion flow of the airflow, effectively improving the drying effect of the grains. On the other hand, the collision of the airflow further improves the mixing effect of the airflow, allowing the cold and hot airflows to be further evenly mixed.

[0049] After the two sets of fans 3 are started, rising airflows are formed in the hot air chamber 101 and the cold air chamber 102 respectively. The airflow in the hot air chamber 101 is affected by the heater 4 to form a hot airflow, and the airflow in the cold air chamber 102 forms a cold airflow. The hot and cold airflows flow upward to the connecting frame 703 and flow to the sleeve 8 through the connecting frame 703.

[0050] At night, the ambient temperature of the valley further decreases, and the temperature of the cold air flow formed in the cold air chamber 102 is relatively low. In order to improve the drying quality (make the drying temperature of the mixed air flow appropriate), the injection amount of the cold air flow will be reduced, and the injection amount of the air flow in the hot air chamber 101 will be increased; at this time, the temperature difference between the cold and hot air flows is relatively large. In order to improve the mixing effect, it is necessary to make the cold and hot air flows staggered strongly. By arranging the sleeve 8 into an expansion section 801 and a contraction section 802, the diameter value of the expansion section 801 is greater than the diameter value of the contraction section 802, and then when the air flow flows, the air flow will continuously diffuse and gather in the expansion section 801 and the contraction section 802, thereby effectively improving the mixing effect. When the cold and hot air flows into the sleeve 8, the sleeve 8 is connected to the connecting frame 703. The connecting frame 703 makes the diameter of the sleeve 8 larger. When the cold and hot air flows to the middle of the sleeve 8, the diameter of the sleeve 8 decreases, so that the airflow gathers. The cold and hot air flows continue to flow to the end of a section of the sleeve 8. At this time, the sleeve 8 is supported by the ring body 7022 and has a larger diameter, so the airflow diffuses. The front end of the next sleeve 8 is supported by the ring body 7022 and has a larger diameter. When the airflow continues to flow to the middle of the next sleeve 8, the sleeve 8 loses support and its diameter shrinks, so that the airflow gathers. Through the arrangement of multiple sleeves 8, the airflow is continuously diffused and gathered, thereby achieving the purpose of good mixing effect.

[0051] During the day, the ambient temperature in the valley is relatively high, and the temperature of the cold air flow formed in the cold air chamber 102 is relatively high. In order to increase the amount of cold air entering and reduce the amount of air flow injected into the hot air chamber 101, in order to improve energy consumption, it is necessary to increase the amount of cold air entering and reduce the amount of air flow injected into the hot air chamber 101. At the same time, in order to ensure the mixing effect, it is necessary to extend the length of the sleeve 8 so that the sleeve 8 is fully mixed. By setting the adjustment component 5, during the flow of the cold and hot air flows, the sleeve 8 is pulled so that the sleeve 8 is straightened, and the contraction section 802 of the sleeve 8 is opened, and the straightened sleeve 8 is longer. Specifically, when the flow rate of the cold air flow is relatively large, the plate body 5011 will be pushed upward. When the plate body 5011 moves upward, the spring 505 contracts and the tooth plate 502 moves upward. The tooth plate 502 drives the double-headed screw 6 to rotate through the gear 503. The rotation of the double-headed screw 6 causes the connecting sleeve 7021 to move laterally. , and then pull the sleeve 8. In order to pull the multiple sleeves 8, the pitch of the double-headed screw 6 surface gradually increases from the inside to the outside, and then the spacing between the multiple connecting sleeves 7021 increases, thereby achieving the purpose of pulling the multiple sleeves 8. By arranging a slider 70211 in the connecting sleeve 7021, when the pitch of the double-headed screw 6 increases, the slider 70211 can translate to ensure the stability of the connection between the connecting sleeve 7021 and the double-headed screw 6. After the connecting sleeve 7021 is opened, the contraction section 802 is opened, thereby reducing the diameter difference with the expansion section 801. At this time, the airflow can flow stably when it flows. At the same time, the movement of the connecting sleeve 7021 increases the distance between the two ends of the sleeve 8, thereby ensuring the mixing time of the cold and hot airflows, and effectively improving the mixing effect.

[0052] In order to reduce the moisture in the mixed airflow, it is necessary to condense the moisture in the airflow. It is known that condensed water is easily generated when the hot airflow encounters the cold plate. Then, an arc-shaped baffle 202 is provided so that the baffle 202 is arranged in an arc shape, so that the upper end of the baffle 202 extends to the upper end of the hot air flow channel, and then the hot air flow contacts the baffle 202 when it flows. The temperature of the baffle 202 is relatively low, and condensed water is formed on the surface of the baffle 202. At the same time, a fin 204 is provided on the rear side of the baffle 202. The fin 204 fits the baffle 202 for heat conduction, and the cold air flow The temperature of the fins 204 is taken away by the air flow, thereby lowering the temperature of the baffle 202. When the cold air flows, the air flow passes through the gap of the fins 204 and acts on the eccentric piece 5014, pushing the eccentric piece 5014 to rotate. The rotation of the eccentric piece 5014 causes friction with the fins 204, causing the fins 204 to vibrate slightly. The vibration of the fins 204 is transmitted to the baffle 202, thereby causing the baffle 202 to vibrate slightly, thereby effectively removing the condensed water on the surface of the baffle 202. At this time, the empty baffle 202 is convenient for the condensed water to condense again.

[0053] The mixed airflow flows into the drying device d to dry the grains in the drying device d.

[0054] Although the embodiments of the present invention have been described, it will be apparent to those skilled in the art that changes and modifications may be made to the embodiments to obtain other effects with an understanding of the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A temperature uniformity control device for a low-temperature circulation grain dryer, wherein the temperature uniformity control device (c) is applied to the low-temperature circulation grain dryer, and the low-temperature circulation grain dryer comprises a housing (a) and a temperature uniformity control device (c), characterized in that: The temperature uniformity control device (c) comprises a shell (1), a partition (2), a fan (3), a heater (4), an adjustment component (5), a double-headed screw (6), a stretching component (7), a sleeve (8) and a guide tube (9), wherein the shell (1) is connected to the front end of the inner cavity of the outer shell (a), the partition (2) is connected to the middle of the inner cavity of the shell (1) and divides the inner cavity of the shell (1) into a hot air cavity (101) and a cold air cavity (102), two groups of the fans (3) are respectively connected to the lower ends of the hot air cavity (101) and the cold air cavity (102), the heater (4) is connected to the lower side of the hot air cavity (101), and the adjustment component (5) is connected to the lower end of the hot air cavity (101). The joint component (5) is connected to the upper side of the cold air chamber (102), the double-headed screw (6) is connected to the upper side of the adjustment component (5), the stretching component (7) is connected to the outer wall of the double-headed screw (6), the sleeve (8) is connected to the stretching component (7), and the two guide tubes (9) are respectively connected to the upper sides of the stretching components (7) at both ends; when air flows in the cold air chamber (102), the adjustment component (5) drives the double-headed screw (6) to rotate, and the rotation amplitude of the double-headed screw (6) is positively correlated with the air flow velocity; the stretching component (7) adjusts the pulling force on the end of the sleeve (8) according to the rotation amplitude of the double-headed screw (6); The stretching assembly (7) comprises a sleeve frame (701), a sleeve ring (702) and a connecting frame (703); the sleeve frame (701) is connected to the upper end of the shell (1); the double-headed screw (6) is connected to the middle of the sleeve frame (701); the sleeve ring (702) is connected to the surface of the double-headed screw (6) in a spiral array; the sleeve (8) is connected between two adjacent sleeve rings (702); the connecting frame (703) is connected to the middle of the sleeve frame (701); and the lower end of the connecting frame (703) is connected to the hot air chamber (101) and the cold air chamber (102); The sleeve (8) comprises an expansion section (801) and a contraction section (802), the expansion section (801) being located at both ends of the contraction section (802), and one end of the expansion section (801) away from the contraction section (802) being connected to the collar (702), the diameter of the contraction section (802) being smaller than the diameter of the expansion section (801), and the sleeve (8) being made of rubber material; The collar (702) comprises a connecting sleeve (7021), a ring body (7022), a retaining ring (7023) and a through hole (7024); the connecting sleeve (7021) is connected to the double-headed screw (6); the ring body (7022) is connected to the connecting sleeve (7021); the retaining ring (7023) is connected to the inner wall of the ring body (7022); an array of through holes (7024) is provided on the circumferential surface of the ring body (7022); and an annular groove (7025) is provided on the windward side of the retaining ring (7023); The pitch of the thread groove on the surface of the double-headed screw (6) gradually increases from the inside to the outside; the inner wall of the connecting sleeve (7021) is connected to a slider (70211); the slider (70211) is arranged in the thread groove on the surface of the double-headed screw (6); the inner wall of the sleeve frame (701) is provided with a slot (7011); the slot (7011) is connected to the ring body (7022); The upper end of the connecting frame (703) is connected to the sleeve (8), and is located at the rear side of the connecting frame (703) when the cold air flow rises, while being located at the front side of the connecting frame (703) when the hot air flow rises; When the double-headed screw (6) rotates, the ring body (7022) is limited by the clamping groove (7011), and the connecting sleeve (7021) moves laterally on the surface of the double-headed screw (6). Since the pitch of the thread groove on the surface of the double-headed screw (6) gradually increases from the inside to the outside, the connecting sleeve (7021) close to the inside moves a shorter distance, while the connecting sleeve (7021) close to the outside moves a longer distance, thereby achieving pulling of the sleeve (8). Pulling of the sleeve (8) can increase the length of the sleeve (8).

2. The temperature uniformity control device for a low-temperature circulating grain dryer according to claim 1, characterized in that: The partition member (2) comprises a partition (201), a baffle (202), a guide plate (203) and a fin (204); the partition (201) is connected to the lower side of the middle part of the inner cavity of the shell (1); the baffle (202) is connected to the upper end of the partition (201); the guide plate (203) and the fin (204) are respectively connected to the front and rear sides of the baffle (202); the baffle (202) is arc-shaped; and the lower side of the guide plate (203) is arc-shaped.

3. The temperature uniformity control device for a low-temperature circulating grain dryer according to claim 2, characterized in that: The adjustment assembly (5) comprises a slide plate (501), a tooth plate (502), a gear (503), a notch (504), a spring (505) and a limit plate (506); the slide plate (501) is connected to the rear side of the inner cavity of the housing (1); the tooth plate (502) is connected to the top of the slide plate (501); the gear (503) is meshed with the upper side of the tooth plate (502); the gear (503) is connected to the double-headed screw (6); the notch (504) is provided on the outer side of the slide plate (501); the lower end of the spring (505) is connected to the bottom end of the notch (504); the limit plate (506) is connected to the upper end of the spring (505); and the lower side of the slide plate (501) is arc-shaped.

4. The temperature uniformity control device for a low-temperature circulating grain dryer according to claim 3 is characterized in that: The slide plate (501) comprises a plate body (5011), a rectangular groove (5012), an axle rod (5013) and an eccentric piece (5014); the plate body (5011) is connected to the upper end of the rear side of the inner cavity of the shell (1); an array of the rectangular grooves (5012) is opened at the front end of the plate body (5011); the axle rod (5013) passes through the rectangular grooves (5012); an array of the eccentric pieces (5014) is connected to the axle rod (5013), and the position of the eccentric pieces (5014) corresponds to the position of the rectangular grooves (5012).

5. The temperature uniformity control device for a low-temperature circulating grain dryer according to claim 4, characterized in that: The eccentric member (5014) comprises an eccentric plate (50141) and blades (50142); the eccentric plate (50141) is connected to the shaft (5013); a blade (50142) is connected between two adjacent eccentric plates (50141); the blade (50142) is inclined; a farthest point m is provided on the eccentric plate (50141); the farthest point m contacts the inner wall of the fin (204) when rotating.

6. The temperature uniformity control device for a low-temperature circulating grain dryer according to claim 5, characterized in that: The two conduits (9) are respectively connected to the upper ends of the outer ring body (7022); the conduits (9) penetrate the sleeve frame (701) and are slidably connected to the sleeve frame (701); the upper sides of the two conduits (9) are connected to U-shaped plates (10), and the openings of the U-shaped plates (10) are opposite to each other.

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