Eggshell drying tunnel dryer

Abstract

The utility model discloses an eggshell drying tunnel dryer, and relates to the technical field of eggshell drying. In order to solve the problems that an existing tunnel dryer is low in eggshell heat exchange efficiency and not fast in water vapor diffusion, the following technical scheme is provided: the eggshell heat exchanger comprises a tunnel pipe, a rotating shaft is axially arranged in the tunnel pipe, a spiral blade sleeves the rotating shaft, a motor is arranged on one side of the tunnel pipe, and the motor and a transmission are connected with the rotating shaft; a feeding port and an air outlet are formed in the top of the side, close to the motor, of the tunnel pipe, an air inlet is formed in the side, away from the feeding port, of the top of the tunnel pipe, and a clean air heater is arranged at the top of the air inlet and used for introducing hot air into the tunnel pipe; the motor and the air heater are both in communication connection with a controller arranged on the tunnel pipe. The eggshell drying device can increase the contact area of hot air and eggshells, shorten the drying time and effectively avoid local overheating or insufficient drying.

Description

TECHNICAL FIELD

[0001] The utility model relates to eggshell drying technical field, concretely relates to an eggshell drying tunnel dryer. BACKGROUND

[0002] Eggshell drying is a key process in eggshell processing, and its main purpose is to remove the moisture in the eggshell to facilitate the powder processing or long-term storage of the eggshell. During the drying process, it is crucial to maintain the effective ingredient content of the eggshell, which directly affects the quality and subsequent application value of the eggshell product.

[0003] Currently, the commonly used tunnel dryer on the market has certain limitations in eggshell drying. These devices usually simply place electric heaters at the end or tail of the tunnel dryer, resulting in uneven heat distribution and a relatively static state of the materials during the drying process. This design results in low heat exchange efficiency, making it difficult for the moisture in the eggshell to effectively diffuse into the air, thus affecting the drying effect.

[0004] In addition, due to insufficient contact between the materials and hot air, the drying time is prolonged, which not only increases energy consumption but also may cause the eggshell surface to overheat while the internal moisture remains, affecting the drying quality and subsequent processing performance of the eggshell. Therefore, this traditional tunnel dryer is not suitable as a dedicated device for eggshell drying. In order to improve the drying efficiency and quality of the eggshell, a new type of tunnel dryer needs to be developed to optimize the contact between hot air and eggshell, improve heat exchange efficiency, and ensure that the effective ingredient content of the eggshell remains unchanged during the drying process, thus meeting the needs of eggshell processing. SUMMARY

[0005] The utility model aims at providing an eggshell drying tunnel dryer to solve the problems of low heat exchange efficiency and slow water vapor diffusion of existing eggshell tunnel dryers.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] An eggshell drying tunnel dryer comprises a tunnel pipe, a rotating shaft arranged axially inside the tunnel pipe, a spiral blade sleeved on the rotating shaft, a motor arranged on one side of the tunnel pipe, the motor connected with the rotating shaft, an inlet and an air outlet arranged on the top of the side of the tunnel pipe close to the motor, an air inlet arranged on the side of the top of the tunnel pipe away from the inlet, a hot air blower arranged on the top of the air inlet for blowing hot air into the tunnel pipe, and a controller arranged on the tunnel pipe and in communication connection with the motor and the hot air blower.

[0008] As a preferred embodiment, a speed changer is arranged between the motor and the rotating shaft, and the speed changer is in communication connection with the controller.

[0009] Preferably, the rotating shaft is provided with a sealing pad at both ends to increase the sealing performance.

[0010] Preferably, the top of the tunnel pipe is provided with an air outlet near the feeding port for discharging the wet air in the tunnel pipe; and the outer side of the tunnel pipe is provided with a heat insulation layer.

[0011] Preferably, the air outlet is provided with a filter screen.

[0012] Preferably, the side end of the hot air blower is provided with a primary and medium efficiency filter, which is in communication connection with the controller.

[0013] Preferably, the spiral blade is uniformly provided with blade holes for increasing the air permeation area.

[0014] Preferably, the inner side of the tunnel pipe away from the motor is provided with a pressure sensor and a temperature and humidity sensor, which are in communication connection with the controller.

[0015] Preferably, the controller is provided with a control panel, and the control panel is provided with a general switch and a pressure, humidity, temperature overload alarm lamp.

[0016] Preferably, the bottom of the tunnel pipe away from the motor is provided with a discharging port, which is controlled to be opened or closed through a discharging port switch, and the discharging port switch is in communication connection with the controller.

[0017] The utility model has the following beneficial effects:

[0018] The spiral blade of the utility model adopts 35%-40% opening rate to cooperate with the blade hole arranged in equilateral triangle of phi 8mm, so that the contact area between the hot air and the egg shell is increased by more than 40%, and the 1:1.5 compression ratio conveying channel formed by the variable pitch ensures that the material is uniformly turned and the drying time is shortened, the actual drying efficiency reaches 1.5-3t / h, and the moisture content of the finished product is stable and less than or equal to 8%. The controller realizes closed-loop control through the pressure sensor and the temperature and humidity sensor, automatically adjusts the rotating speed of the hot air blower and the conveying speed of the motor and the feeding, so that the drying curve fluctuation range is controlled within ±3%, and local overheating or insufficient drying is effectively avoided.

[0019] The double-layer structure of the tunnel pipe reduces the heat loss to less than 5%, the three-stage filter screen of the air outlet intercepts the egg shell debris, reduces the risk of hot air system blockage, the thermal efficiency is improved to more than 85%, and the overall power is less than or equal to 12kW. The motor is matched with different tunnel lengths through the transmission, and the no-load current is reduced by 30% through the frequency conversion control, so that the power saving is about 20%-35% compared with the traditional constant speed equipment.

[0020] The helical blade keeps 5mm gap with the tunnel pipe, matches double-layer fluorine rubber sealing pad, ensures flexible rotation (vibration value is less than 2mm / s), and avoids eggshell blockage.

[0021] The touch screen integrates parameter setting, state monitoring and alarm record functions, supports one-key adjustment of key parameters such as hot air temperature and target humidity, reduces manual intervention error, the hot air machine is connected with the tunnel pipe through a clamp joint, and damaged parts such as filter screen and blade can be quickly replaced, and maintenance time is shortened by 50%. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is a structural schematic view of the eggshell drying tunnel dryer of the utility model;

[0023] Fig. 2 It is a structural view of the controller;

[0024] Figs. 1-2 The reference signs shown in the drawings represent: motor 1, support table 2, speed changer 3, sealing pad 6, rotating shaft 7, helical blade 8, tunnel pipe 9, discharge port 10, discharge port switch 11, pressure sensor 13, temperature and humidity sensor 15, primary and medium efficiency filter 16, hot air machine 17, heat preservation layer 18, blade hole 19, air outlet 20, filter screen 21, feeding port 22, electric switch 23, power supply master switch 24, humidity, temperature, pressure overload alarm lamp 25, control panel 26, controller 27. DETAILED DESCRIPTION

[0025] The technical scheme of the utility model is clearly and completely described below in combination with the drawings, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] Please refer to Figs. 1-2The utility model provides a kind of eggshell drying tunnel dryer, the whole drying machine adopts tunnel structure, main component is horizontally arranged cylindrical tunnel pipe 9.Tunnel pipe 9 inner diameter is designed as 800mm-1200mm according to processing capacity, length is set as 6m-10m, ensure that eggshell has enough drying time in pipe.Tunnel pipe 9 adopts double-layer structure, inner layer is 304 stainless steel plate with thickness 2mm, outer layer is wrapped 50mm thick rock wool insulation layer 18, insulation layer 18 is covered with flame-retardant polyester film.Tunnel pipe 9 is fixed by flange and support table at both ends, flange contact surface is equipped with high-temperature-resistant sealing rubber strip, ensure overall sealing property.

[0027] Transmission system is composed of variable frequency motor 1, transmission 3, transmission shaft 7 component.Electric machine 1 adopts the three-phase asynchronous motor of protection grade IP55, power is configured as 5.5kW-11kW according to tunnel length.Transmission 3 adopts helical gear hard tooth surface reducer, speed ratio range is 10-30, output shaft is connected with transmission shaft 7 through diaphragm coupling.Transmission shaft 7 adopts φ89x4.5mm seamless steel tube, is fixed on support table through self-aligning ball bearing at both ends, bearing housing outer ring is equipped with cooling jacket to prevent overheating.Double-layer fluorine rubber sealing pad 6 is installed between transmission shaft 7 and tunnel pipe 9, inner sealing pad rotates with shaft, outer fixed sealing, ensure that hot air does not leak.

[0028] Spiral blade 8 adopts 304 stainless steel plate with thickness 4mm, is welded on transmission shaft 7 in continuous variable pitch mode.Blade outer diameter keeps 5mm gap with tunnel pipe 9 inner diameter, both ensure flexible rotation and prevent eggshell from blocking.Blade surface is uniformly provided with φ8mm circular vent hole 19, hole spacing is arranged according to equilateral triangle, and opening rate is controlled at 35%-40%.Blade pitch gradually transitions from 80mm at feeding end to 40mm at discharging end, forms the conveying channel with compression ratio 1:1.5, both ensure conveying efficiency and avoid eggshell breakage.

[0029] Hot air system is composed of centrifugal hot air blower 17 and air treatment unit.Hot air blower 17 air volume is set as 2000m 3 / h-4000m 3 / h, air pressure 2000Pa-3000Pa, sets primary filter screen at air inlet, and filter screen aperture is 2mm.Air treatment unit includes G4 grade primary filter 16 and F7 grade medium efficiency filter, filter frame adopts galvanized steel sheet, and sealing pad adopts closed-cell sponge rubber.Hot air blower 17 air outlet is connected with tunnel pipe 9 air inlet through φ300mm high-temperature-resistant silicone hose, and hoop type quick connector is used at connecting place, convenient for dismounting and cleaning.

[0030] The controller 27 is the core of PLC, and the 7-inch touch screen is configured as the control panel 26. The main interface of the control panel 26 is divided into a parameter setting area, a state monitoring area and an alarm recording area. The parameter setting area can adjust the hot air temperature (40-80℃), the conveying speed (0.2-0.8 m / s) and the target humidity (≤10%) and other key parameters. The state monitoring area displays the current temperature, humidity, pressure value and motor speed in real time. The alarm system includes an audible and visual alarm module. When the temperature exceeds 85℃, the humidity exceeds 15% or the pressure exceeds 150Pa, the alarm is automatically triggered and the power supply of the hot air blower 17 is cut off.

[0031] The feeding system adopts the structure of a vibrating feeder combined with the feeding port 22. The volume of the feeding port 22 is designed to be 0.5 m 3 The bottom is equipped with an electromagnetic vibrating feeder, and the feeding amount is steplessly adjusted in the range of 0.2-0.8 t / h through the control panel 26. The plug valve is arranged at the outlet of the feeding port 22, and is connected with the feeding port at the top of the tunnel pipe 9. Food-grade silicone sealing rings are used at the joint. The discharge port 10 adopts a pneumatic flap valve, which is driven by a cylinder to open. The opening angle is adjustable in the range of 0°-60°, and the cylinder action is controlled by the signal of the pressure sensor 13. When the pressure in the tunnel pipe 9 reaches the preset threshold value (80-120 Pa), the discharge is automatically opened.

[0032] As for the safety device, the tunnel pipe 9 is equipped with a bimetallic thermometer as a temperature redundancy monitoring device. When the temperature exceeds 90℃, the heating power supply is directly cut off. PT100 temperature sensors are arranged at the bearing seats at both ends of the transmission shaft 7. When the bearing temperature rises by more than 40℃, the cooling water circulation is started. The whole machine grounding system adopts the TN-S system, and the grounding resistance of the motor 1 shell is ≤4Ω. The emergency stop button is arranged at a prominent position of the control panel 26, and after being pressed, all power supplies can be immediately cut off.

[0033] During the equipment debugging, first, the no-load trial operation is carried out: the motor 1 is started to make the spiral blade 8 run at the lowest speed, and the transmission is gradually adjusted to the rated speed. Whether the vibration value of the transmission system is less than 2 mm / s is observed. Then, the hot air system test is carried out: the hot air blower 17 is started to make the wind speed in the tunnel pipe 9 reach the design value. The smoke generator is used to detect the airflow distribution uniformity, and the guide plate of the air inlet is adjusted to control the wind speed deviation within ±5%. Finally, the linkage debugging is carried out: the test material is put in according to the process parameter setting value. The power of the hot air blower 17 and the feeding speed are automatically adjusted through the feedback of the temperature and humidity sensor 15, and whether the drying curve meets the requirements is verified. When the humidity in the tunnel detected by the temperature and humidity sensor 15 reaches a certain value, the feeding speed is automatically controlled to slow down.

[0034] When the device is working, the wet eggshells are uniformly sent into the tunnel pipe 9 by the vibrating feeder, and form a continuous flow under the pushing of the spiral blade 8. The hot air machine 17 sends the filtered clean hot air (temperature 60-70℃) into the tunnel pipe 9, and the hot air is in full contact with the eggshells through the blade hole 19, and carries away the evaporated water. The wet air is discharged from the air outlet 20 at the front end of the tunnel pipe 9, and the three-layer filter screen 21 (pore size 5μm, 10μm, 20μm) arranged at the air outlet 20 effectively intercepts the eggshell debris. During the drying process, the pressure sensor 13 monitors the pressure in the pipe in real time, and the discharge port 10 is opened when the pressure reaches the preset threshold, so as to ensure the continuity of the material flow. The control system automatically adjusts the rotating speed of the hot air machine 17 according to the feedback of the temperature and humidity sensor 15, so as to realize closed-loop control.

[0035] In terms of device maintenance, the primary filter 16 needs to be cleaned every week, the spiral blade 8 needs to be checked for wear every month, the bearing seat needs to be injected with lubricating grease every quarter, and the middle filter cartridge needs to be replaced every year. When processing different specifications of eggshells, the conveying speed and hot air temperature parameters can be adjusted through the control panel 26 without mechanical adjustment. When cleaning the device, the cleaning port at the bottom of the tunnel pipe 9 can be opened, and high-pressure steam can be connected to clean the inside.

[0036] Through the above structure design and parameter configuration, the dryer realizes continuous and efficient drying of the eggshells, the drying efficiency reaches 1.5t-3t fresh eggshells per hour, the moisture content of the finished product is stably below 8%, and the eggshell breakage rate is less than 0.5%. The power consumption of the whole machine is controlled within 12kW, the thermal efficiency is above 85%, and the industrial production requirements are met.

[0037] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An eggshell drying tunnel dryer characterized by, The utility model relates to a tunnel pipe (9) is provided with rotating shaft (7) in the axial direction in, the rotating shaft (7) is provided with spiral blade (8) on the sleeve, one side of tunnel pipe (9) is equipped with motor (1), motor (1) is connected with rotating shaft (7), the top of tunnel pipe (9) is close to the top of motor (1) side and is equipped with feed inlet (22), the top of tunnel pipe (9) is equipped with air inlet away from feed inlet (22) side, the top of air inlet is equipped with hot air machine (17), is used to pass into hot air in tunnel pipe (9), motor (1) and hot air machine (17) are connected with controller (27) communication connection being arranged on tunnel pipe (9). The motor (1) and the rotating shaft (7) are provided with a transmission (3), and the transmission (3) is connected with the controller (27).

2. The eggshell drying tunnel of claim 1, wherein, Both ends of the rotating shaft (7) are provided with a sealing pad (6) for increasing the sealing.

3. The eggshell drying tunnel of claim 1, wherein, The top of the tunnel pipe (9) is close to the air outlet (20) of the air outlet (20) for discharging the wet air in the tunnel pipe (9) is opened; The outer side of the tunnel pipe (9) is provided with a heat insulation layer (18).

4. The eggshell drying tunnel of claim 1, wherein, The air outlet (20) is provided with a filter screen (21).

5. The eggshell drying tunnel of claim 4, wherein, The side end of the hot air machine (17) is provided with a primary and medium efficiency filter (16), and the primary and medium efficiency filter (16) is connected with the controller (27).

6. The eggshell drying tunnel of claim 1, wherein, The spiral blade (8) is uniformly provided with blade holes (19) for increasing the air permeation area.

7. The eggshell drying tunnel of any one of claims 1 to 6, wherein, The inner side of the tunnel pipe (9) away from the motor (1) is provided with a pressure sensor (13) and a temperature and humidity sensor (15), and the pressure sensor (13) and the temperature and humidity sensor (15) are connected with the controller (27).

8. The eggshell drying tunnel of claim 1, wherein, The controller (27) is provided with a control panel (26), and the control panel (26) is provided with a total switch (24) and a pressure, humidity, temperature overload alarm lamp (25) below.

9. The eggshell drying tunnel of claim 8, wherein, The bottom of the tunnel pipe (9) away from the motor (1) side is provided with a discharge port (10), and the discharge port (10) is controlled to open and close through a discharge port switch (11), and the discharge port switch (11) is connected with the controller (27). The feed inlet (22) is controlled to open and close through a feed inlet switch (23), and the feed inlet switch (23) is connected with the controller (27).

10. The eggshell drying tunnel of claim 1, wherein, ​

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