A material dryer

Abstract

This invention provides a material dryer, comprising: a machine body with a drying chamber within its inner cavity; an air inlet group and an air outlet group alternately arranged from top to bottom within the drying chamber; the air inlet group includes multiple air inlet boxes spaced apart horizontally; the air outlet group includes multiple air outlet boxes spaced apart horizontally; the air inlet boxes and air outlet boxes are staggered; the air inlet boxes reflect incoming hot air downwards; and the air outlet boxes discharge the reflected hot air from the drying chamber; a hot air output device supplies hot air to the air inlet group within the drying chamber; an exhaust device creates negative pressure at the air outlet of the air outlet group; and a material circulation conveying device circulates material into the inner cavity of the machine body for drying. This invention improves the uniformity of hot air distribution within the dryer and enhances drying efficiency.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and more specifically to a material dryer. Background Technology

[0002] With improvements in grain varieties, increased yields, and increased national investment in grain drying equipment, more and more large, medium, and small grain drying facilities are being built. Drying equipment generates a large amount of hot air in a short time to kill insect eggs at high temperatures, thus completely solving the problem of material drying. Based on the relative movement direction of the grain and the airflow, dryers can be classified into cross-flow, mixed-flow, co-flow, counter-flow, and co-counter-flow, mixed-counter-flow, and co-mixed-flow types.

[0003] Although there are many types of drying equipment, improving the drying efficiency and achieving better and more uniform drying results has always been a research direction for those skilled in the art. To improve drying efficiency and achieve a more uniform drying effect, it is required that the hot air be evenly distributed in the drying chamber and that the temperature of the hot air be increased as much as possible.

[0004] In conclusion, there is an urgent need for a material dryer to solve the problems existing in the current technology. Summary of the Invention

[0005] The purpose of this invention is to provide a material dryer that addresses the problems of achieving uniform distribution of hot air within the drying chamber and increasing the hot air temperature. The specific technical solution is as follows:

[0006] A material dryer, comprising:

[0007] The machine body has a drying chamber inside its cavity; an air inlet group and an air outlet group are alternately arranged from top to bottom in the drying chamber. The air inlet group includes multiple air inlet boxes spaced apart in the horizontal direction, and the air outlet group includes multiple air outlet boxes spaced apart in the horizontal direction. The air inlet boxes and air outlet boxes are staggered. The air inlet boxes are used to reflect the hot air entering them to their lower side, and the air outlet boxes are used to discharge the reflected hot air out of the drying chamber.

[0008] A hot air output device is used to supply hot air to the air intake group in the drying chamber;

[0009] An exhaust system, which is used to create negative pressure at the outlet of the exhaust group;

[0010] The material circulation conveying device is used to circulate materials into the inner cavity of the machine body for drying.

[0011] In the preferred embodiment of the above technical solution, an air inlet box and an air outlet box are provided between two opposite side plates of the drying chamber, with an air inlet on one side plate communicating with the air inlet box and an air outlet on the other side plate communicating with the air outlet box.

[0012] In the preferred embodiment of the above technical solutions, the cross-section of the air inlet box and the air outlet box perpendicular to their own length direction is arc-shaped or inverted V-shaped.

[0013] In the preferred embodiment of the above technical solution, multiple guide plates are provided vertically at intervals on both inner walls of the drying chamber that are parallel to the air inlet box.

[0014] In a preferred embodiment of the above technical solutions, the inner cavity of the machine body further includes a receiving hopper and an inverted V-shaped material distribution component disposed below the drying chamber. The material distribution component is disposed in the middle of the receiving hopper, and material feeding wheels are provided on both sides of the material distribution component and between it and the receiving hopper.

[0015] In a preferred embodiment of the above technical solutions, the material circulation conveying device includes a lifting device, a lower conveying device, and an upper conveying device. The lower conveying device is located in the lower part of the inner cavity of the machine body and is used to convey the dried material to the lifting device. The upper conveying device is located at the upper end of the machine body and is used to convey the material lifted by the lifting device into the inner cavity of the machine body.

[0016] In a preferred embodiment of the above technical solutions, the lifting device includes a lifting drive component, a drive wheel, a driven wheel, a conveying ring component, and a bucket disposed on the conveying ring component. The two ends of the conveying ring component are connected to the drive wheel and the driven wheel. The lifting drive component drives the drive wheel to move the conveying ring component, the driven wheel, and the bucket. Between the drive wheel and the driven wheel, one of them also distributes the driving force to the upper conveying device, and the other distributes the driving force to the lower conveying device.

[0017] Preferably, the above technical solutions also include a spraying device, which includes a drive shaft and a spraying wheel. The drive shaft is rotatably mounted on the machine body, and the spraying wheel is fixedly mounted on the drive shaft. The spraying wheel is located in the inner cavity of the machine body and below the discharge port of the upper conveying device. The drive shaft and the end of the conveying auger in the upper conveying device are driven by gear meshing.

[0018] In a preferred embodiment of the above technical solution, a material level sensing device is further provided in the upper part of the inner cavity of the machine body. The material level sensing device includes a mounting box, a sensor, and a sensing block. The sensor is disposed in the inner cavity of the mounting box. The mounting box has a sensing window on one vertical side plate. The sensing block is located in the inner cavity of the mounting box and is rotatably disposed at the sensing window. The sensor is triggered by the rotation of the sensing block. The lower end of the mounting box has an opening communicating with the inner cavity of the mounting box.

[0019] In a preferred embodiment of the above technical solutions, the hot air output device includes a feeding assembly, a heat exchange chamber, and a combustion chamber and an exhaust device respectively disposed at both ends of the heat exchange chamber. The feeding assembly is used to supply fuel to the combustion chamber. The heat exchange chamber is provided with multiple heat exchange tubes at intervals, and the two ends of the heat exchange tubes are respectively connected to the combustion chamber and the exhaust device. The end of the heat exchange chamber near the exhaust device is connected to the air inlet, and the end of the heat exchange chamber near the combustion chamber is connected to the air outlet.

[0020] The heat exchange chamber is equipped with a baffle plate, which is used to change the flow direction of fresh air in the heat exchange chamber to extend the flow path of fresh air in the heat exchange chamber.

[0021] The application of the technical solution of the present invention has the following beneficial effects:

[0022] Under the combined action of the hot air output device and the exhaust device, the hot air entering the drying chamber along the air inlet box will diffuse downwards along the sides of the air inlet box (some hot air will flow along the air inlet box until it touches the side plate on the other side and bounces downwards). Since the air outlet box is connected to the exhaust device, the hot air diffused in the air inlet box will be sucked into the air outlet box for discharge under the action of negative pressure. Due to the suction effect of the air outlet box, the hot air diffused from the air inlet box around the air outlet box can be sucked away by the air outlet box. Therefore, the hot air can be evenly distributed in every place in the drying chamber after entering the drying chamber, ensuring that the material in every position in the drying chamber can be dried, achieving the effect of uniform drying of the material and improving drying efficiency.

[0023] The hot air output device of this invention extends the flow path and residence time of fresh air in the heat exchange chamber by setting a baffle plate in the heat exchange chamber, ensuring sufficient time for heat exchange. Simultaneously, the fresh air sequentially exchanges heat with the surfaces of some exhaust pipes, the smoke collection box, the heat exchange tubes in the heat exchange chamber, and the outer surface of the combustion chamber. As the fresh air flows, the temperature of the objects undergoing heat exchange gradually increases, achieving a synchronous and gradual temperature rise during the fresh air flow process. This fully utilizes the heat generated by combustion to warm the fresh air, greatly improving the efficiency of heat exchange and heat utilization, and reducing fuel consumption. The increased hot air temperature significantly improves the drying efficiency of materials.

[0024] In this invention, an opening is provided at the lower end of the mounting box, which connects to the inner cavity of the mounting box. This effectively prevents materials from entering the interior of the mounting box and causing the sensing block to jam. During operation, materials enter the inner cavity of the mounting box through the sensing window, simultaneously pushing the sensing block to rotate and triggering an alarm. During this process, the material enters the inner cavity of the mounting box. As the height of the material decreases, it leaves the inner cavity of the mounting box through the opening under its own gravity, and the sensing block can then reset and deactivate the alarm. If no opening is provided, the intruding material cannot subsequently leave the mounting box, thus jamming the sensing block and preventing it from rotating to trigger the sensor or deactivate the alarm.

[0025] The lifting device, upper conveying device, lower conveying device, and spraying device of the present invention all share a single driving component, which greatly reduces the demand for driving components and lowers the power of the equipment. At the same time, since all devices share a single driving component, all devices will operate synchronously, preventing the dryer from having no material or material accumulation due to a delay or failure of a certain device to operate.

[0026] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 This is a front view of the material dryer of the present invention;

[0029] Figure 2 This is a side view of the material dryer of the present invention;

[0030] Figure 3 yes Figure 1 Sectional view at point AA;

[0031] Figure 4 yes Figure 2 Sectional view at point BB;

[0032] Figure 5 yes Figure 3 Schematic diagram of gas flow in the drying chamber;

[0033] Figure 6 yes Figure 4 Schematic diagram of gas flow in the drying chamber;

[0034] Figure 7 This is a schematic diagram of the material level sensing device;

[0035] Figure 8 This is an isometric view of the material level sensing device;

[0036] Figure 9 This is a schematic diagram of the hot air output device;

[0037] Figure 10 yes Figure 8 Sectional view at point DD;

[0038] Figure 11 This is an isometric drawing of the hot air output device;

[0039] Among them, 100 is the material level sensing device, 101 is the connecting wire, 102 is the mounting plate, 103 is the material level pipe, 104 is the mounting box, 105 is the sensor, 106 is the sensing block, 107 is the protective sleeve, 108 is the opening, 109 is the sensing window, 200 is the hot air output device, 201 is the fuel hopper, 202 is the feed inlet, 203 is the feeding auger, 204 is the combustion chamber, 205 is the heat exchange tube, 206 is the heat exchange chamber, 207 is the air inlet, 208 is the exhaust pipe, and 209 is the smoke extraction device. 10. Smoke collection box; 211. Baffle plate; 212. Air outlet; 213. Outer shell; 300. Machine body; 301. Drying chamber; 302. Receiving hopper; 303. Material distribution component; 304. Material feeding wheel; 400. Lifting device; 401. Material hopper; 402. Lifting drive component; 403. Lifting belt; 500. Lower conveyor device; 501. Lower conveyor belt; 600. Upper conveyor device; 601. Upper conveyor belt; 700. Discharge pipe; 800. Exhaust device; 900. Spraying device;

[0040] 3011, Intake box; 3012, Exhaust box; 3013, Deflector. Detailed Implementation

[0041] To facilitate understanding of the present invention, a more complete description is provided below, along with preferred embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0043] Example:

[0044] See Figures 1-11 This embodiment provides a material dryer, including:

[0045] The machine body 300 has a drying chamber 301 in its inner cavity. The drying chamber 301 has an air inlet group and an air outlet group arranged alternately from top to bottom. The air inlet group includes a plurality of air inlet boxes 3011 arranged at intervals along the horizontal direction. The air outlet group includes a plurality of air outlet boxes 3012 arranged at intervals along the horizontal direction. The air inlet boxes 3011 and the air outlet boxes 3012 are staggered in the horizontal direction and are parallel to each other. The air inlet boxes 3011 are used to reflect the hot air entering them to their lower side. The air outlet boxes 3012 are used to discharge the reflected hot air out of the drying chamber 301.

[0046] Hot air output device 200 is used to supply hot air to the air intake group in drying chamber 301;

[0047] An exhaust device 800 is used to create negative pressure at the outlet of the exhaust assembly;

[0048] The material circulation conveying device is used to circulate the material into the inner cavity of the machine body 300 for drying.

[0049] See Figures 3-6 An air inlet box 3011 and an air outlet box 3012 are provided between two opposite side plates of the drying chamber 301. That is, the two ends of the air inlet box and the air outlet box are respectively connected to the two side plates. One side plate has an air inlet that connects to the air inlet box 3011, and the other side plate has an air outlet that connects to the air outlet box 3012. In this way, hot air enters from one side of the drying chamber and exits from the other side, thereby drying the material entering the drying chamber.

[0050] Furthermore, the cross-sections of the air inlet box 3011 and the air outlet box 3012 perpendicular to their own length direction are arc-shaped or inverted V-shaped; in this embodiment, they are inverted V-shaped. Under the combined action of the hot air output device and the exhaust device, the hot air entering the drying chamber along the air inlet box will diffuse downwards along both sides of the air inlet box (some hot air will flow along the air inlet box until it touches the side plate on the other side and bounces downwards). Since the air outlet box is connected to the exhaust device, the hot air diffused from the air inlet box under the action of negative pressure will be sucked into the air outlet box for discharge. Due to the suction effect of the air outlet box, the hot air diffused from the air inlet box around the air outlet box can be sucked away by the air outlet box. Therefore, the hot air can be evenly distributed in every place of the drying chamber after entering the drying chamber, ensuring that the material in every position in the drying chamber can be dried, and achieving the effect of uniform drying of the material.

[0051] Furthermore, to prevent hot air from flowing along the side walls of the drying chamber and thus failing to achieve a drying effect, this embodiment provides multiple guide plates 3013 vertically spaced on both inner walls of the drying chamber 301 parallel to the air inlet box 3011. The guide plates 3013 are used to guide the hot airflow that originally flows vertically downward along the side walls of the drying chamber to diffuse towards the center of the drying chamber, thus solving the problem that some hot air cannot achieve a drying effect due to the hot airflow flowing along the side walls. At the same time, after the material falls onto the guide plates, it will also be guided by the guide plates to diffuse towards the center of the drying chamber, preventing the material from sticking along the side walls of the drying chamber.

[0052] like Figure 4 As shown, after the drying chamber 301 is disposed in the inner cavity of the machine body, an air inlet chamber and an air outlet chamber can be separated between the drying chamber and the inner wall of the machine body. The air inlet chamber is connected to the air inlet of the hot air output device 200 and the air inlet box, and the air outlet chamber is connected to the air outlet of the exhaust device 800 and the air outlet box.

[0053] Please continue reading Figure 4 The inner cavity of the machine body 300 also includes a receiving hopper 302 and an inverted V-shaped distributing component 303 disposed below the drying chamber 301. The distributing component 303 is disposed in the middle of the receiving hopper 302, and material-pushing wheels 304 are provided on both sides of the distributing component 303 between it and the receiving hopper 302. Specifically, the cross-section of the receiving hopper 302 is V-shaped, and the cross-section of the distributing component 303 is inverted V-shaped. The distributing component is disposed in the receiving hopper, and a space for material passage is formed between the side of the distributing component and the side plate of the receiving hopper. The material-pushing wheels 304 are placed in this space to control the output of material; that is, material can be output only when the material-pushing wheels rotate, and the space is blocked and no material can be discharged if the material-pushing wheels do not rotate. Furthermore, the discharge speed and discharge amount can be controlled by controlling the rotation speed and number of rotations of the material-pushing wheels. The material-pushing wheels are driven to rotate by a motor or a hydraulic motor. For the structural form of the material-pushing wheels, please refer to the prior art.

[0054] See Figures 1-4 The material circulation conveying device includes a lifting device 400, a lower conveying device 500, and an upper conveying device 600. The lower conveying device 500 is located in the lower part of the inner cavity of the machine body 300 (specifically, it is located below the outlet of the receiving hopper) and is used to convey the dried material to the lifting device 400. The upper conveying device 600 is located at the upper end of the machine body 300 and is used to convey the material lifted by the lifting device 400 into the inner cavity of the machine body 300.

[0055] Furthermore, the lifting device 400 includes a lifting drive 402, a drive wheel, a driven wheel, a conveying ring, and a bucket disposed on the conveying ring. The two ends of the conveying ring are connected to the drive wheel and the driven wheel. The lifting drive 402 drives the drive wheel to move the conveying ring, the driven wheel, and the bucket. Between the drive wheel and the driven wheel, one of them also distributes the driving force to the upper conveying device 600, and the other distributes the driving force to the lower conveying device 500. That is, the upper conveying device, the lower conveying device, and the lifting device can be driven to move together by one lifting drive 402. To distribute the driving force to the upper and lower conveying devices, this embodiment provides a transmission structure. Specifically, the driving wheel and driven wheel are each equipped with a transmission wheel. The first transmission wheel rotates synchronously with the driving wheel. The driving wheel is connected to the lifting drive 402 via a lifting belt 403. The first transmission wheel is connected to the upper conveying device 600 via an upper conveying belt 601, enabling the upper conveying device and the lifting device (specifically, the lifting device lifts materials by moving the bucket with the conveying ring) to work. After the driving wheel rotates, the driven wheel also rotates synchronously. The second transmission wheel is also set to rotate synchronously with the driven wheel. The second transmission wheel is connected to the lower conveying device 500 via a lower conveying belt 501, thus enabling the lower conveying device to move synchronously with the upper conveying device and the lifting device.

[0056] Preferably, in this embodiment, both the upper conveying device and the lower conveying device are auger conveying devices, and the conveying ring can be a synchronous belt or a synchronous chain. When the material being lifted by the bucket is heavy, a synchronous chain is preferred as the conveying ring. The lifting drive is a motor or a hydraulic motor.

[0057] Preferably, the lifting device 400 further includes a material hopper 401, which is located at the lower end of the lifting device 400. Material is added from the material hopper 401 and then lifted by the bucket.

[0058] Preferably, the dryer further includes a discharge pipe 700, which is connected to the upper conveying device 600. The upper conveying device 600 is equipped with a valve to allow material to be conveyed into the dryer cavity or discharged from the discharge pipe 700. The specific structure of the valve can be found in the prior art. In some embodiments, a discharge port may be provided at the lower part of the machine body or on the lower conveying device, which can also allow the dried material to be discharged from the inside of the dryer.

[0059] See Figure 3The material dryer also includes a spraying device 900, which comprises a drive shaft and a spraying wheel. The drive shaft is rotatably mounted on the machine body 300, and the spraying wheel is fixedly mounted on the drive shaft. The spraying wheel is located in the inner cavity of the machine body and below the discharge port of the upper conveying device 600. The drive shaft is driven by a bevel gear meshing with the end of the conveying auger in the upper conveying device 600. That is, after the upper conveying device outputs material, it falls onto the spraying wheel. The rotation of the spraying wheel disperses the material into the drying chamber through centrifugal force, facilitating subsequent drying. In this embodiment, by setting a bevel gear at the end of the conveying auger of the upper conveying device, the spraying wheel rotates synchronously with the upper conveying device, eliminating the need for an additional drive device to drive the spraying wheel. This also ensures that the spraying wheel moves synchronously with the upper conveying device, preventing the problem of material accumulating on the spraying wheel when the upper conveying device is working but the spraying wheel is not rotating.

[0060] Preferably, the exhaust device 800 is an exhaust fan, and the lower end of the machine body is equipped with casters to facilitate the movement of the dryer.

[0061] Please see Figure 4 , Figure 7 and Figure 8 To prevent the dryer from bursting, a material level sensor 100 is installed at the top of the dryer's inner cavity. The material level sensor 100 includes a mounting box 104, a sensor 105, and a sensing block 106. The sensor 105 is located inside the mounting box 104. A sensing window 109 is provided on one vertical side plate of the mounting box 104. The sensing block 106 is located inside the mounting box 104 and rotatably positioned at the sensing window 109. Rotation of the sensing block 106 triggers the sensor 105. An opening 108 communicating with the inner cavity of the mounting box 104 is provided at the lower end of the mounting box 104.

[0062] The mounting box 104 is used to mount the sensor 105 and also protects the sensor from damage or malfunction caused by materials, dust, or debris. In the material level sensing device of this embodiment, the material pushes the sensing block 106 to rotate through the sensing window 109, thereby triggering the sensor 105 to achieve the effect of alarming the material level.

[0063] In this embodiment, an opening 108 is provided at the lower end of the mounting box 104. The opening 108 connects to the inner cavity of the mounting box, which can effectively prevent materials from entering the interior of the mounting box 104 and causing the sensing block to jam. During operation, materials enter the inner cavity of the mounting box through the sensing window 109, simultaneously pushing the sensing block to rotate and triggering the sensor 105 alarm. During this process, the materials will enter the inner cavity of the mounting box 104. When the height of the materials decreases, the materials will leave the inner cavity of the mounting box 104 through the opening 108 under the action of their own gravity. The sensing block 106 can then reset and deactivate the sensor alarm. If the opening 108 is not provided, the intruding materials will not be able to leave the mounting box, which will jam the sensing block and prevent it from rotating to trigger the sensor or deactivate the sensor alarm.

[0064] Preferably, in order to accurately detect the material accumulation height, the material level sensing device 100 in this embodiment should have its sensing window placed on the side closer to the feeding wheel (i.e., the feeding side) during installation. If the sensing window is not placed on the feeding side, but is located on the side away from the feeding side, the material accumulation may have reached the alarm height, but due to the obstruction of the mounting box, the sensing block cannot be pushed to trigger the sensor to sound an alarm for a long time, which poses a risk of silo overflow.

[0065] Please continue reading Figure 7 In this embodiment, the material level sensing device 100 further includes a protective sleeve 107, which is used to wrap around the outer surface of the sensor 105. Specifically, the protective sleeve 107 includes a protective sleeve body and a wire guide sleeve disposed on the protective sleeve body. The protective sleeve body is used to cover the outer surface of the sensor, and the wire guide sleeve is used to facilitate the passage of the sensor's connecting wire 101. The protective sleeve 107 provides protection for the sensor, preventing dust and debris from entering the sensor and affecting its normal operation.

[0066] Preferably, the upper end of the sensing block 106 is rotatably connected to the inner wall of the sensor 105 or the mounting box 104, so that the sensing block 106 rotates to contact the trigger part of the sensor 105. See also Figure 7 In this embodiment, the upper end of the sensing block 106 is rotatably connected to the sensor 105, and the sensing block touches the trigger part of the sensor by rotating; of course, it is also feasible to rotatably connect the upper end of the sensing block to the inner wall of the mounting box.

[0067] Preferably, the sensor 105 is located at the upper end of the inner cavity of the mounting box 104, ensuring that the sensor is kept away from materials that intrude into the inner cavity of the mounting box, preventing the sensor from being submerged by materials or from being damaged by dust or debris.

[0068] Please continue reading Figure 7 and Figure 8 The material level sensing device also includes a material level tube 103, one end of which is connected to the mounting box 104 and the inner cavities of the two are interconnected. The connecting line 101 of the sensor 105 passes through the inner cavity of the mounting box 104 and the inner cavity of the material level tube 103.

[0069] Furthermore, the other end of the material level pipe 103 is provided with a mounting plate 102. The mounting plate allows the material level sensor to be installed on the inner wall of the machine body. The mounting plate 102 has a through hole connecting to the inner cavity of the material level pipe 103, meaning the connecting wire 101 from the material level pipe 103 passes through the through hole. The mounting plate 102 and the material level pipe 103 enable the material level sensor to be installed inside the machine body, achieving a material height alarm effect. By sequentially passing the connecting wire 101 through the inner cavity of the mounting box, the inner cavity of the material level pipe, and the through hole on the mounting plate, the connecting wire 101 can be hidden, preventing unsightly exposure.

[0070] Preferably, the length of the material level tube 103 in this embodiment is adjustable, thereby fixing the sensor at different height positions and enabling alarms at different height positions to meet the needs of actual use environments; by adjusting the length of the material level tube, the sensor is positioned at a specified height to achieve accurate alarms; at the same time, by setting the material level sensing device in this embodiment at different positions and heights, multi-level alarms can be achieved to prevent silo overflow.

[0071] This embodiment provides two structural schemes for adjusting the length of the material level tube. Of course, this is not limited to the structural form of this embodiment. Those skilled in the art can improve or use other length adjustment structures.

[0072] Specifically, the first type of structure for adjusting the length of the material level pipe is as follows:

[0073] The material level tube 103 includes an inner tube section and an outer tube section. Both the inner tube section and the outer tube section are provided with multiple positioning holes arranged along their own length direction. After the outer tube section is sleeved on the inner tube section, a fastener is used to pass through the positioning holes on the inner tube section and the positioning holes on the outer tube section to fix the length of the material level tube 103.

[0074] Furthermore, the fastener can be a pin or a bolt assembly (i.e., a bolt and nut). When the fit between the outer and inner pipe sections reaches the required length, the fastener is inserted into the positioning holes of the outer and inner pipe sections to fix the material level pipe to the specified length, thus meeting the length adjustment requirements of the material level pipe. It should be noted that the number of positioning holes on the inner pipe section and the number of positioning holes on the outer pipe section are not necessarily the same. Setting one positioning hole on one inner or outer pipe section and multiple positioning holes on another outer or inner pipe section can achieve the same adjustment effect.

[0075] Specifically, the second type of material level pipe length adjustment structure is as follows:

[0076] The material level pipe 103 includes an adjusting pipe section, a first connecting pipe section, a second connecting pipe section, and a locking nut. The two ends of the adjusting pipe section are provided with threaded sections with opposite directions of rotation. The two ends of the adjusting pipe section are respectively threaded to the first connecting pipe section and the second connecting pipe section. The adjusting pipe section is fixed to the first connecting pipe section and the second connecting pipe section using locking nuts.

[0077] Furthermore, the first and second connecting pipe sections are respectively provided with internal or external threads that match the threaded sections at both ends of the adjusting pipe section; when the threaded section is an external thread, the connecting pipe sections one and two are internal threads; when the threaded section is an internal thread, the connecting pipe sections one and two are external threads. By rotating the adjusting pipe section, the connecting pipe sections one and two can be simultaneously moved closer to or further away from the adjusting pipe section (i.e., the material level pipe becomes shorter or longer), thereby achieving the effect of adjusting the length of the material level pipe; after the length of the material level pipe is adjusted to the correct position, a lock nut is used to fix the adjusting pipe section to the connecting pipe sections one and two to prevent self-rotation between the adjusting pipe section and the connecting pipe sections one and two, which would lead to changes in the length of the material level pipe and structural instability. It should be noted that the threaded sections at both ends of the adjusting pipe section can both be internal or external threads, or one end can be an external thread and the other end an internal thread. In this embodiment, the second material level tube length adjustment structure can achieve stepless adjustment of the material level tube length, which can meet more refined and precise adjustment requirements.

[0078] Preferably, in this embodiment, the sensor 105 is a proximity switch. By triggering the proximity switch, an alarm signal is transmitted to the upper-level control unit, thereby realizing the alarm of the material level height.

[0079] Preferably, in this embodiment, the sensing block completely covers the sensing window to prevent material from entering the inner cavity of the mounting box through the gap between the sensing block and the sensing window, which could cause the sensing block to jam and fail to trigger the alarm.

[0080] Please see Figures 9-11The hot air output device 200 includes a feeding assembly, a heat exchange chamber 206, and a combustion chamber 204 and a smoke exhaust device respectively disposed at both ends of the heat exchange chamber 206. The feeding assembly is used to supply fuel to the combustion chamber 204. A plurality of heat exchange tubes 205 are spaced apart in the heat exchange chamber 206, and the two ends of the heat exchange tubes 205 are respectively connected to the combustion chamber 204 and the smoke exhaust device. That is, the smoke containing a large amount of heat generated by combustion in the combustion chamber enters the smoke exhaust device through the heat exchange tubes. The end of the heat exchange chamber 206 near the smoke exhaust device is connected to the air inlet 207, and the end of the heat exchange chamber 206 near the combustion chamber 204 is connected to the air outlet 212. That is, under the action of the exhaust device 800, fresh air (i.e., cold air to be heated) enters the heat exchange chamber 206 through the air inlet 207, and after completing the heat exchange, it is discharged from the heat exchange chamber 206 to the drying chamber through the air outlet 212, thereby achieving the purpose of drying the material.

[0081] Preferably, the heat exchange chamber 206 is provided with a baffle plate 211, which is used to change the flow direction of fresh air in the heat exchange chamber 206 to extend the flow path of fresh air in the heat exchange chamber 206 and ensure that fresh air has sufficient time to exchange heat in the heat exchange chamber.

[0082] This embodiment Figure 9 The diagram illustrates a baffle plate 211 installed inside the heat exchange chamber 206. This baffle plate prevents fresh air from entering the heat exchange chamber from the air inlet 207 and flowing straight to the air outlet for discharge. The baffle plate 211 extends the flow path of fresh air in the heat exchange chamber, ensuring that the fresh air can fully exchange heat in the heat exchange chamber.

[0083] This embodiment further provides a baffle arrangement (not shown) to extend the flow path of fresh air. Specifically, baffles 211 are provided on two opposing inner walls of the heat exchange chamber 206. The baffles 211 on the two inner walls are staggered, and one baffle 211 extends into the space between two baffles 211 on the other inner wall, so that the fresh air flows in an S-shape within the heat exchange chamber 206. That is, by setting baffles in the heat exchange chamber to restrict the fresh air to flow only in an S-shape, the flow time of the fresh air in the heat exchange chamber can be greatly extended, ensuring that the fresh air has enough time to exchange heat with the heat exchange tubes and improving the efficiency of heat exchange. Furthermore, the baffles can be staggered on the upper and lower inner walls of the heat exchange chamber, or on the left and right inner walls of the heat exchange chamber. Furthermore, the dimensions of the baffles satisfy the following: L2 represents the distance between the two inner walls where the baffles are installed, and L1 represents the dimension of the baffle along the L2 direction. This ensures that the baffles can block at least half of the flow cross-section of the heat exchange chamber, forcing fresh air to flow in an S-shape through the staggered baffles on the two inner walls. Furthermore, the dimensions of the baffles satisfy the following: This can further extend the flow path of fresh air in the heat exchange chamber, thereby further improving the efficiency of heat exchange.

[0084] Preferably, when the baffle plate 211 is provided in the heat exchange chamber, the heat exchange tube 205 is provided through the baffle plate. The baffle plate in the heat exchange chamber can not only extend the flow path of fresh air, but also support the heat exchange tube and increase the structural stability of the heat exchange chamber.

[0085] See Figure 9 The heat exchange chamber 206 is provided with a smoke collection box 210 at one end near the smoke exhaust device. One side of the smoke collection box 210 is connected to the outlet end of all heat exchange tubes 205 (the inlet end of the heat exchange tubes is connected to the combustion chamber), and the other side is connected to the smoke exhaust device. The smoke collection box can concentrate the smoke in all heat exchange tubes, so that the smoke exhaust device can discharge the smoke generated by combustion.

[0086] Furthermore, the smoke exhaust device includes a smoke exhaust pipe 208 and a smoke extraction device 209. The inlet end of the smoke exhaust pipe 208 is connected to the smoke collection box 210. The smoke extraction device 209 is disposed on the smoke exhaust pipe 208. The smoke extraction device is used to create a negative pressure in the smoke exhaust pipe 208, thereby drawing the smoke in the combustion chamber into the heat exchange tube and then discharging it to the outside through the smoke exhaust pipe 208. During the process of the smoke extraction device extracting the smoke, oxygen-containing air is also introduced into the combustion chamber, allowing the fuel to burn completely. Furthermore, by controlling the suction force of the smoke extraction device on the smoke, the smoke discharge speed can be controlled, that is, the smoke containing a large amount of heat can be discharged slowly, allowing the smoke to stay in the hot air output device for a relatively long time for heat exchange, which is beneficial to improving the efficiency of heat exchange.

[0087] Furthermore, such as Figure 11 As shown, the hot air output device also includes a housing 213 (the housing is disposed inside the body 300), wherein a portion of the exhaust pipe 208, the smoke collection box 210, the heat exchange chamber, and the combustion chamber are sequentially located inside the housing 213. The heat exchange chamber is located in the middle of the housing 213, and multiple heat exchange pipes are arranged inside the housing to form a heat exchange chamber (i.e., a heat exchange zone). The combustion chamber is located behind the heat exchange chamber, and the combustion chamber is an independent space built into the housing. Figure 9As shown, the heat increases progressively from the exhaust pipe towards the combustion chamber. To maximize heat exchange efficiency, an air inlet is provided at the end of the outer casing furthest from the combustion chamber, and an air outlet is provided at the end closest to the combustion chamber. Fresh air enters the outer casing through the air inlet and begins heat exchange. As the fresh air flows from the air inlet 207 to the air outlet 212, it sequentially exchanges heat with the surfaces of parts of the exhaust pipe 208, the smoke collection box 210, the heat exchange tubes in the heat exchange chamber 206, and the outer surface of the combustion chamber 204. The fresh air gradually flows towards the combustion chamber, where the temperature is highest, allowing the temperature of the fresh air to gradually rise. This ensures sufficient heating of the fresh air, effectively improving heat exchange efficiency and increasing fuel utilization.

[0088] See Figure 9 The feeding assembly includes a fuel hopper 201 and a feeding auger 203. The inlet 202 of the feeding auger 203 is connected to the fuel hopper 201, and the outlet of the feeding auger 203 is connected to the combustion chamber 204. The fuel hopper is used for adding fuel and temporarily storing fuel, while the feeding auger can quantitatively add fuel to the combustion chamber to ensure complete combustion.

[0089] like Figure 11 As shown, in this embodiment, the air outlets 212 are located on both sides below the combustion chamber 204. Since the combustion chamber is the place with the highest temperature in the entire hot air output device, the heat of the combustion chamber can be fully utilized to further heat the fresh air and ensure that the fresh air is sufficiently heated. The air outlets on both sides can increase the output of hot air and ensure sufficient hot air supply.

[0090] Preferably, the outer surface of the exhaust pipe is provided with a protective layer to prevent burns to personnel due to excessively high temperature of the exhaust pipe.

[0091] Preferably, the smoke extraction device uses a fan to generate negative pressure and achieve gas flow.

[0092] In the operation of the dryer in this embodiment, the material is added from the material hopper 401 to the lifting device 400. The lifting device 400 lifts the material to the upper conveying device 600, and then the upper conveying device transports it to the inner cavity of the machine body. After entering the inner cavity of the machine body, the material falls onto the throwing wheel. The rotating throwing wheel disperses and throws the material out through centrifugal force. Under the action of gravity, the material passes through the drying chamber 301 for drying. Then, under the action of the material distribution component, it falls into both sides of the receiving hopper 302. The rotating material-pushing wheel 304 makes the dried material fall into the lower conveying device 500. The lower conveying device transports the material back to the lifting device, and the lifting device lifts it again. This process is repeated until the material is dried. Then, the upper conveying device is controlled to stop transporting material into the inner cavity of the machine body, and the completely dried material is discharged from the discharge pipe 700.

[0093] The dryer in this embodiment is used for drying agricultural crops, such as rice and wheat. Of course, the dryer in this embodiment may also be used for drying other particulate materials.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A material dryer, characterized in that, include: The machine body (300) has a drying chamber (301) in its inner cavity; the drying chamber (301) is arranged with an air inlet group and an air outlet group alternately from top to bottom. The air inlet group includes a plurality of air inlet boxes (3011) arranged at intervals along the horizontal direction, and the air outlet group includes a plurality of air outlet boxes (3012) arranged at intervals along the horizontal direction. The air inlet boxes (3011) and the air outlet boxes (3012) are staggered. The air inlet boxes (3011) are used to reflect the hot air entering them to their lower part, and the air outlet boxes (3012) are used to discharge the reflected hot air out of the drying chamber (301). A hot air output device (200) is used to supply hot air to the air intake group in the drying chamber (301); An exhaust device (800) is used to create negative pressure at the outlet of the exhaust assembly; A material circulation conveying device is used to circulate and feed materials into the inner cavity of the machine body (300) for drying; An air inlet box (3011) and an air outlet box (3012) are provided between two opposite side plates of the drying chamber (301). An air inlet communicating with the air inlet box (3011) is provided on one side plate, and an air outlet communicating with the air outlet box (3012) is provided on the other side plate. Multiple guide plates (3013) are provided vertically at intervals on the two inner walls of the drying chamber (301) parallel to the air inlet box (3011). It also includes a material level sensing device (100) disposed on the upper part of the inner cavity of the machine body (300). The material level sensing device (100) includes a mounting box (104), a sensor (105) and a sensing block (106). The sensor (105) is disposed in the inner cavity of the mounting box (104). The mounting box (104) has a sensing window (109) on one vertical side plate. The sensing block (106) is located in the inner cavity of the mounting box (104) and is rotatably disposed at the sensing window (109). The sensor (105) is triggered by the rotation of the sensing block (106). The lower end of the mounting box (104) has an opening (108) communicating with the inner cavity of the mounting box (104).

2. The material dryer according to claim 1, characterized in that, The cross-sections of the air inlet box (3011) and the air outlet box (3012) perpendicular to their own length direction are arc-shaped or inverted V-shaped.

3. The material dryer according to claim 1, characterized in that, The inner cavity of the machine body (300) also includes a receiving hopper (302) and an inverted V-shaped material distribution component (303) disposed below the drying chamber (301). The material distribution component (303) is disposed in the middle of the receiving hopper (302), and material feeding wheels (304) are provided on both sides of the material distribution component (303) and between the receiving hopper (302).

4. The material dryer according to claim 1, characterized in that, The material circulation conveying device includes a lifting device (400), a lower conveying device (500), and an upper conveying device (600). The lower conveying device (500) is located at the lower part of the inner cavity of the machine body (300) and is used to convey the dried material to the lifting device (400). The upper conveying device (600) is located at the upper end of the machine body (300) and is used to convey the material lifted by the lifting device (400) into the inner cavity of the machine body (300).

5. The material dryer according to claim 4, characterized in that, The lifting device (400) includes a lifting drive (402), a drive wheel, a driven wheel, a conveying ring, and a bucket disposed on the conveying ring. The two ends of the conveying ring are connected to the drive wheel and the driven wheel. The lifting drive (402) drives the drive wheel to move the conveying ring, the driven wheel, and the bucket. Between the drive wheel and the driven wheel, one of them also distributes the driving force to the upper conveying device (600), and the other distributes the driving force to the lower conveying device (500).

6. The material dryer according to claim 5, characterized in that, It also includes a spraying device (900), which includes a drive shaft and a spraying wheel. The drive shaft is rotatably mounted on the machine body (300), and the spraying wheel is fixedly mounted on the drive shaft. The spraying wheel is located in the inner cavity of the machine body and below the discharge port of the upper conveying device (600). The drive shaft is driven by gear meshing with the end of the conveying auger in the upper conveying device (600).

7. The material dryer according to claim 1, characterized in that, The hot air output device (200) includes a feeding assembly, a heat exchange chamber (206), and a combustion chamber (204) and a smoke exhaust device respectively disposed at both ends of the heat exchange chamber (206). The feeding assembly is used to supply fuel to the combustion chamber (204). A plurality of heat exchange tubes (205) are spaced apart in the heat exchange chamber (206), and the two ends of the heat exchange tubes (205) are respectively connected to the combustion chamber (204) and the smoke exhaust device. The end of the heat exchange chamber (206) near the smoke exhaust device is connected to the air inlet (207), and the end of the heat exchange chamber (206) near the combustion chamber (204) is connected to the air outlet (212). The heat exchange chamber (206) is provided with a baffle plate (211), which is used to change the flow direction of fresh air in the heat exchange chamber (206) to extend the flow path of fresh air in the heat exchange chamber (206).

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