Pipelined filter material oven and control method thereof
Technical Field
The invention relates to the technical field of filter material processing equipment, in particular to a pipelined filter material baking oven and a control method thereof.
Background
The filter cloth is a filter medium woven from natural fibers or synthetic fibers, such as industrial filter cloth for industrial dust filtration, etc. Common materials are cotton, hemp, wool, cocoon silk, asbestos fibers, glass fibers, and certain synthetic fibers, etc., such as cotton canvas, denim, wool woolen, etc. In a broad sense, the filter cloth also comprises a metal mesh or a filter screen.
In terms of the actual effect of the filter cloth, the filter cloth needs to be impregnated by PTFE in the manufacturing process, if the impregnation firmness needs to be improved, the filter cloth needs to be sent into an oven for drying, so that the oven is needed in the manufacturing process of the filter cloth, and when the oven is used, the oven is dried in a pipelining manner, the drying time is shorter, so that after the humidity of the oven is detected, the drying efficiency is improved by a corresponding control method, which is also a problem at present;
The traditional oven mainly relies on the high power of the oven to accelerate drying, and does not have the condition of extruding filter materials, so that the water moves, and the drying efficiency is relatively poor;
The traditional feeding of the filter material is required to be aligned with the feeding position, the feeding position cannot be correspondingly adjusted, sometimes the aimed filter material is large and wide, feeding and inconvenience are brought to the effect that the conveying channel is required to be adjusted so as to facilitate feeding, and all three problems are needed to be solved at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a pipelined filter material oven control method with double temperature sensors, strong detection stability and good control effect on the drying degree.
The invention provides a pipelined filter material baking oven which comprises a rack, a baking oven arranged on the rack, a feed inlet and a winding traction roller which are respectively arranged on two sides of the baking oven, wherein a conveying channel is arranged on the rack, the conveying channel is arranged in the middle of the baking oven and outputs to one side of the winding traction roller, the baking oven comprises a plurality of groups of heating plates respectively arranged on the upper side and the lower side of the conveying channel, a first driver for driving the heating plates to approach or separate from a filter material and an extrusion mechanism arranged on the conveying channel, the extrusion mechanism is used for extruding water in the filter material, and the conveying channel consists of two long guide rails which are horizontally and parallelly arranged.
The extrusion mechanism comprises two coating frame bodies arranged on the inner side walls of the transmission channel, a driving cylinder arranged on the transmission channel and used for driving the coating frame bodies to extrude towards the middle and reset, and an elastic structure arranged on the inner walls of the coating frame bodies.
The elastic structure comprises a plurality of slideways arranged on the inner wall of the cladding frame body, two elastic pieces arranged on the slideways in a sliding manner, a supporting piece sequentially connected with the two elastic pieces and a supporting plate arranged on the supporting piece and abutting against the side face of the filter material, wherein the supporting piece is configured to squeeze the elastic pieces when being stressed, and reset by the elastic acting force of the elastic pieces when not being stressed.
The invention is further provided with a width adjusting structure for conveying filter materials with different widths, wherein the width adjusting structure comprises adjusting seats which are respectively arranged on two long guide rails and are arranged on the outer sides of the long guide rails, a second driver which is connected with the adjusting seats and is used for driving the long guide rails to move and forming the width increase or decrease of the conveying channel, and a distance controller which is used for controlling the second driver to adjust the positions of the long guide rails.
The invention further provides that an intermediate reference plate is arranged in the oven and used for adjusting the central position of the filter material in cooperation with a distance controller, the specific control method of the distance control is that after the filter material enters a conveying channel, the distance controller detects that the distances between two sides of the filter material and the intermediate reference plate are D1 and D2 respectively through the distance sensor, detects the distances between two long tracks and the intermediate reference plate are D3 and D4 respectively, and sends signals to the distance controller, the distance controller compares the displacement L=D2+ | (D1-D2) |/2 and the displacement L1=D4+ | (D3-D4) |/2, and if the displacement L > is the displacement L1 or the displacement L < the displacement L1, the second driver is required to be driven to adjust the two long guide rails until the displacement L=the displacement L1.
Through adopting the technical scheme, 1, the invention adopts the conveying channel, the conveying channel consists of two horizontal long guide rails which are arranged in parallel, the material clamping type matching is carried out on the filter material through the matching of the two long guide rails, and the formed extrusion mechanism can accelerate the movement of water molecules in the filter material when the filter material is dried through the two coating frame bodies and the driving cylinder which is arranged on the conveying channel and is used for driving the coating frame bodies to extrude and reset towards the middle, so that the drying is accelerated, and the damage to the filter material is greatly improved through the elastic structure when the extrusion pressure is carried out in order to reduce the rigid damage to the filter material, so that the practicability is greatly improved, and the structure is simple;
2. According to the invention, the elastic structure is arranged to comprise a plurality of slideways arranged on the inner wall of the cladding frame body, two elastic pieces arranged on the slideways in a sliding manner, a supporting piece sequentially connected with the two elastic pieces and a supporting plate arranged on the supporting piece and propped against the side surface of the filter material, wherein the supporting piece is configured to extrude the elastic piece when being stressed;
3. the device is characterized in that the transmission channel is further provided with a width adjusting structure for conveying filter materials with different widths, the width adjusting structure comprises adjusting seats which are respectively arranged on two long guide rails and are arranged on the outer sides of the long guide rails, a second driver which is connected with the adjusting seats and is used for driving the long guide rails to move and forming the increase or decrease of the width of the transmission channel, and a distance controller which is used for controlling the second driver to adjust the position of the long guide rails;
The control method is suitable for the assembly line type filter material baking oven, wherein a humidity controller, a first humidity sensor and a second humidity sensor are arranged in the baking oven and are electrically connected with the humidity controller, the first humidity sensor is arranged in the baking oven, the second humidity sensor is arranged in the external environment of the baking oven, and the humidity controller automatically adjusts the distance change between a heating plate and a filter material in each baking oven according to the humidity change of the external environment of the baking oven, so that the actual dynamic requirement that the baking is carried out until the set drying degree is within a fixed drying duration is ensured;
According to the absolute humidity detected by the first humidity sensor, namely the humidity in the oven, and the relative humidity detected by the second humidity sensor, namely the humidity of the environment outside the oven, the distance between the heating plate and the filter material is automatically adjusted by combining the monitoring structures of the absolute humidity and the humidity detected by the second humidity sensor, the humidity controller comprises a receiving unit, and the receiving unit is used for receiving humidity values detected by the first humidity sensor and the second humidity sensor;
the comparison unit is used for comparing the set humidity values of the two humidity sensors with the detected humidity values when the drying degree is required to be achieved;
And a control unit for controlling the distance between the heating plate and the filter material in the oven when the distance between the heating plate and the filter material in the oven needs to be adjusted,
S1, heating a heating plate in an oven, approaching to a filter material, and recording the current humidity through a control unit in a time period T1;
S2, setting absolute humidity values of a first humidity sensor when the distance between the heating plate and the filter material is adjusted to be W1 and W2, wherein the W1 value is a critical point of humidity and humidity change, and the W2 value is a critical point of drying and humidity change;
S3, continuously or intermittently detecting and collecting the current environmental humidity in the oven by the first humidity sensor in a time period T2, comparing the detected relative humidity value with a W1 value and a W2 value by a comparison unit to judge whether the detected value W is larger than the W1 value, if so, continuing to monitor, and keeping the distance between the initial heating plate and the filter material, if not, judging whether the absolute humidity is between the W1 value and the W2 value, if so, judging that the absolute humidity reaches the distance between the heating plate and the filter material, and entering a next relative humidity inspection step, if not, judging that the absolute humidity is smaller than the W2 value, judging that the absolute humidity reaches the distance between the filter material and the heating plate, and if the humidity is reduced, keeping the heating plate away from the filter material, and entering the next relative humidity inspection step;
s4, checking and detecting the relative humidity by a second humidity sensor, wherein the relative humidity detected by the humidity sensor is W0, and comparing the W value with the W0 value by a comparison module in a humidity controller;
S5, judging whether the W value is the same as the W0 value, if so, detecting the distance between the current heating plate and the filter material, then adjusting the distance between the current heating plate and the filter material by a control unit according to the range of the W value, gradually keeping away from the filter material, driving the filter material by a winding roller, and drying the filter material in the next section;
S6, circulating the steps S3-S5.
The humidity controller further comprises a processing environment recording unit, wherein the processing environment recording unit is configured to record the temperature and the humidity of the processing environment, record the current change of the temperature and the humidity of the processing environment and take the current processing environment as a reference of the change of the humidity.
The temperature controller further comprises a timing unit, wherein the timing unit is used for recording the time when the second humidity sensor is in relative humidity detection, and S7, when the time when the timing unit records that the second humidity sensor is in the relative humidity detection state is set as T, the processing environment recording unit is required to intervene;
S8, the timing unit records that the time of the humidity sensor in the relative humidity detection state is T1 in real time, if T1 is larger than T, the probe of the humidity sensor is judged to be in a moist or wet state continuously, the probe is possibly in a condensation state because of low temperature in the current environment, and the processing environment recording unit intervenes;
S9, screening the current processing environment by the processing environment recording unit, and ensuring that the periodic relative humidity monitors the environment humidity if the current processing environment is in a low-temperature or high-humidity environment;
s10, circulating the steps S7-S9.
The invention further provides that the timing unit further sets the time for recording the relative humidity detection state of the second humidity sensor to be Tp, and the hot air is required to be in a condensation state for removing, in the step S9, the timing unit continuously records the time for recording the relative humidity detection state of the second humidity sensor to be T2, and when the T2 time is longer than Tp, the control unit is required to start the hot air system to defrost the condensation state.
The invention is further arranged that when the first humidity sensor detects that the absolute humidity reaches the condition that the distance between the heating plate and the filter material needs to be adjusted, the relative humidity is detected within 10S, and whether a humidity difference value exists or not is judged.
By adopting the technical scheme, the invention adopts the first humidity sensor and the second humidity sensor, the second humidity sensor is used as the humidity detection of the external environment as the standard, the first humidity sensor is used for detecting the humidity in the oven in real time, the change of the humidity is accelerated along with the discharge of the hot humidity by the oven until the humidity of the environment is close to the change, the drying effect of the filter material is realized, the structure is good, the structure is simple, the absolute humidity value of the first humidity sensor is set to be W1 and W2, the W1 value is the critical point of the change of the humidity and the humidity, the W2 value is the critical point of the change of the humidity and the humidity, the current environment humidity is continuously or intermittently detected by the first humidity sensor, the detected relative humidity value is W, the detected value W is compared with the W1 value and the W2 value respectively, whether the W is larger than the W1 value is judged, if the W is larger than the W1 value, the distance between the initial heating plate and the filter material is kept, if the W is smaller than the W1 value, if the absolute humidity is smaller than the absolute humidity value, the absolute humidity is required to be adjusted, the absolute humidity is required to be smaller than the absolute humidity value, the absolute humidity is required to be adjusted, and the absolute humidity is required to be smaller than the absolute humidity value;
In order to improve the drying precision, through the condition of entering ambient temperature and humidity to the second humidity transducer, when then having improved and having carried out the contrast, can ensure present ambient humidity to the phenomenon that does not dry the filter material does not exist takes place, if the humidity of environment is great, then can the value control the heating duration of hot plate according to setting for humidity, the practicality promotes greatly.
Drawings
FIG. 1 is a flow chart of an embodiment of a pipelined filter material oven and a method for controlling the same according to the present invention.
Fig. 2 is a schematic structural diagram of a flow oven with a pipelined filter material oven and a control method thereof according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an elastic structure and a width adjusting structure of an embodiment of a pipelined filter material oven and a control method thereof according to the present invention.
In the figure, reference numeral 1, a frame, 2, an oven, 10, a winding traction roller, 11, a filter material, 20, a conveying channel, 21, a heating plate, 201, a long guide rail, 30, a coating frame body, 31, a driving cylinder, 301, a slideway, 302, an elastic piece, 303, a supporting piece, 304, a supporting plate, 40, an adjusting seat, 41, a second driver and 5, an intermediate reference plate.
Detailed Description
Embodiments of a pipelined filter material oven and a method for controlling the same according to the present invention are further described with reference to fig. 1-3.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature's illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "under" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "lower" may encompass both an upper and lower orientation. The device may be otherwise positioned (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The utility model provides a pipelined filter material oven, includes frame 1, sets up oven 2 on frame 1, sets up feed inlet and wind-up traction roller 10 in oven 2 both sides respectively, be equipped with transfer passage 20 and transfer passage 20 in frame 1 and arrange in oven 2 middle part position and export to wind-up traction roller 10 one side, oven 2 is including setting up respectively in transfer passage 20 a plurality of sets of hot plates 21 of lower both sides, be used for driving hot plate 21 and be close to or keep away from the first driver of filter material 11 and set up the extrusion mechanism on the transfer passage, this extrusion mechanism is used for carrying out extrusion activity to the moisture in the filter material 11, and this transfer passage comprises two horizontal and parallel arrangement's long guide rail 201.
According to the invention, the conveying channel 20 is adopted, the conveying channel 20 consists of two horizontally and parallelly arranged long guide rails 201, the two long guide rails 201 are matched to clamp the filter material 11, and the two coating frame bodies 30 and the driving cylinder 31 which is arranged on the conveying channel and is used for driving the coating frame bodies 30 to extrude and reset towards the middle are adopted, so that the formed extrusion mechanism can accelerate the movement of water molecules in the filter material 11 when the filter material 11 is dried, thereby accelerating the drying, and the damage to the filter material 11 when the extrusion pressure is carried out is improved through an elastic structure in order to reduce the rigid damage to the filter material 11, thereby greatly improving the practicability and simplifying the structure.
The invention is further arranged that the extrusion mechanism comprises two coating frame bodies 30 arranged on the inner side walls of the conveying channel 20, a driving cylinder 31 arranged on the transmission channel and used for driving the coating frame bodies 30 to extrude and reset towards the middle, and an elastic structure arranged on the inner walls of the coating frame bodies 30, wherein the elastic structure comprises a plurality of slide ways 301 arranged on the inner walls of the coating frame bodies 30, two elastic pieces 302 arranged on the slide ways 301 in a sliding manner, a supporting piece 303 sequentially connected with the two elastic pieces 302, and a supporting plate 304 arranged on the supporting piece 303 and abutting against the side surfaces of the filter material 11, wherein the supporting piece 303 is configured to extrude the elastic pieces 302 when being stressed, and reset by the elastic acting force of the elastic pieces 302 when not being stressed. In the invention, the elastic structure is set to comprise a plurality of slide ways 301 arranged on the inner wall of the cladding frame 30, two side elastic pieces 302 arranged on the slide ways 301 in a sliding manner, a supporting piece 303 sequentially connected with the two elastic pieces 302 and a supporting plate 304 arranged on the supporting piece 303 and propped against the side surface of the filter material 11, wherein the supporting piece 303 is configured to squeeze the elastic pieces 302 when being stressed, and the elastic piece 302 is restored by the elastic acting force of the elastic pieces 302 when not being stressed, and slides on the slide ways 301, the elastic pieces 302, the supporting piece 303 and the supporting plate 304 structure, and the elastic pieces 302 are squeezed towards the elastic pieces 302 when the supporting piece 303 is pressed, so that the elastic supporting effect is achieved, and when the supporting piece 303 loses acting force, the elastic restoring effect is realized by the elastic reversing acting force of the elastic pieces 302, and the supporting plate 304 structure is used for the whole acting force area and the whole stability is improved.
The invention is further arranged that the transmission channel is also provided with a width adjusting structure for conveying the filter materials 11 with different widths, the width adjusting structure comprises adjusting seats 40 which are respectively arranged on the two long guide rails 201 and are arranged on the outer sides of the long guide rails 201, a second driver 41 which is connected with the adjusting seats 40 and is used for driving the long guide rails 201 to move and forming the width increase or decrease of the transmission channel 20, and a distance controller which is used for controlling the second driver 41 to adjust the positions of the long guide rails 201, further the transmission channel is also provided with the width adjusting structure for conveying the filter materials 11 with different widths, the width adjusting structure comprises adjusting seats 40 which are respectively arranged on two long guide rails 201 and arranged on the outer sides of the long guide rails 201, a second driver 41 which is connected with the adjusting seats 40 and used for driving the long guide rails 201 to move and form the width increase or decrease of the conveying channel 20, and a distance controller which is used for controlling the second driver 41 to adjust the position of the long guide rails 201.
The invention further provides that the middle reference plate 5 is arranged in the oven 2 and is used for adjusting the center position of the filter material 11 in cooperation with the distance controller, the specific control method of the distance control is as follows, after the filter material 11 enters the conveying channel 20, the distance controller detects that the distances between two sides of the filter material 11 and the middle reference plate 5 are respectively D1 and D2 through the distance sensor, the distances between the two long tracks and the middle reference plate 5 are respectively D3 and D4, and a signal is sent to the distance controller, the distance controller compares the displacement L=d2+ | (D1-D2) |/2 and the displacement L1=d4+ | (D3-D4) |/2, if the displacement L > is the displacement L1 or the displacement L < the displacement L1, the distance controller indicates that the center line of the filter material 11 deviates from the center line of the conveying channel 20, the second driver 41 is required to be driven to adjust the two long guide rails 201 until the displacement L=displacement L1.
By adopting the technical scheme, in order to improve the confirmation of the feeding position of the conveying channel 20 and the filter material 11, the middle reference plate 5 is used as the reference by arranging the middle reference plate 5, then the distance controller detects the distances D1 and D2 between two sides of the filter material 11 and the middle reference plate 5 respectively through the distance sensor, detects the distances D3 and D4 between the two long tracks and the middle reference plate 5 respectively, and sends signals to the distance controller, the distance controller compares the displacement L=D2+ | (D1-D2) I/2 and the displacement L1=D4+ | (D3-D4) |/2, and if the displacement L1 or the displacement L < the displacement L1), the second driver 41 is required to be driven to adjust the two long guide rails 201 until the displacement L=displacement L1, thereby realizing the confirmation of the central lines of the filter material 11 and the conveying channel 20, and realizing good structure stability and practical applicability when the feeding position is determined.
The control method is suitable for the baking oven 2 of the pipelined filter material 11, wherein a humidity controller, a first humidity sensor and a second humidity sensor are arranged in the baking oven 2 and are electrically connected with the humidity controller, the first humidity sensor is arranged in the baking oven 2, the second humidity sensor is arranged in the external environment of the baking oven 2, and the humidity controller automatically adjusts the distance change between a heating plate 21 and the filter material 11 in each baking oven 2 according to the humidity change of the external environment of the baking oven 2, so as to ensure the actual dynamic demand of the baking to the set drying degree in the fixed drying time period;
According to the absolute humidity detected by the first humidity sensor, namely the humidity in the oven 2, and the relative humidity detected by the second humidity sensor, namely the humidity of the environment outside the oven 2 of the oven 2, the distance between the heating plate 21 and the filter material 11 is automatically adjusted by combining the monitoring structures of the absolute humidity and the relative humidity detected by the second humidity sensor, the humidity controller comprises a receiving unit for receiving humidity values detected by the first humidity sensor and the second humidity sensor;
the comparison unit is used for comparing the set humidity values of the two humidity sensors with the detected humidity values when the drying degree is required to be achieved;
And a control unit for controlling the distance between the heating plate 21 and the filter material 11 in the oven 2 when the distance between the heating plate 21 and the filter material 11 in the oven 2 needs to be adjusted,
S1, heating a heating plate 21 in a drying oven 2, and recording the current humidity by a control unit in a time period T1 near a filter material 11;
S2, setting absolute humidity values of a first humidity sensor when the distance between the heating plate 21 and the filter material 11 is adjusted to be W1 and W2, wherein the W1 value is a critical point of humidity and humidity change, and the W2 value is a critical point of drying and humidity change;
S3, continuously or intermittently detecting and collecting the current environmental humidity in the oven 2 by the first humidity sensor in a time period T2, comparing the detected relative humidity value with a W1 value and a W2 value by a comparison unit to judge whether the W is larger than the W1 value, if so, continuing to monitor, keeping the distance between the initial heating plate 21 and the filter material 11, if not, judging whether the W is between the W1 value and the W2 value, if so, judging that the absolute humidity reaches the distance between the heating plate 21 and the filter material 11, and entering a next relative humidity inspection step, if not, judging that the W value is smaller than the W2 value, judging that the absolute humidity reaches the distance between the heating plate 21 and the filter material 11, and if the humidity is reduced, keeping the heating plate 21 away from the filter material 11, and entering the next relative humidity inspection step;
s4, checking and detecting the relative humidity by a second humidity sensor, wherein the relative humidity detected by the humidity sensor is W0, and comparing the W value with the W0 value by a comparison module in a humidity controller;
S5, judging whether the W value is the same as the W0 value, if so, detecting the distance between the current heating plate 21 and the filter material 11, then adjusting the distance between the current heating plate 21 and the filter material 11 by a control unit according to the range of the W value, gradually keeping away from the filter material 11, and driving the filter material 11 by a wind-up roll to enter the next section for drying;
S6, circulating the steps S3-S5.
The humidity controller further comprises a processing environment recording unit, wherein the processing environment recording unit is configured to record the temperature and the humidity of the processing environment, record the current change of the temperature and the humidity of the processing environment and take the current processing environment as a reference of the change of the humidity.
The temperature controller further comprises a timing unit, wherein the timing unit is used for recording the time when the second humidity sensor is in relative humidity detection, and S7, when the time when the timing unit records that the second humidity sensor is in the relative humidity detection state is set as T, the processing environment recording unit is required to intervene;
S8, the timing unit records that the time of the humidity sensor in the relative humidity detection state is T1 in real time, if T1 is larger than T, the probe of the humidity sensor is judged to be in a moist or wet state continuously, the probe is possibly in a condensation state because of low temperature in the current environment, and the processing environment recording unit intervenes;
S9, screening the current processing environment by the processing environment recording unit, and ensuring that the periodic relative humidity monitors the environment humidity if the current processing environment is in a low-temperature or high-humidity environment;
s10, circulating the steps S7-S9.
The invention further provides that the timing unit further sets the time for recording the relative humidity detection state of the second humidity sensor to be Tp, and the hot air is required to be in a condensation state for removing, in the step S9, the timing unit continuously records the time for recording the relative humidity detection state of the second humidity sensor to be T2, and when the T2 time is longer than Tp, the control unit is required to start the hot air system to defrost the condensation state.
The invention is further arranged that when the first humidity sensor detects that the absolute humidity reaches the condition that the distance between the heating plate 21 and the filter material 11 needs to be adjusted, the relative humidity is detected in 10S, and whether a humidity difference value exists or not is judged.
By adopting the technical scheme, the first humidity sensor and the second humidity sensor are adopted, the second humidity sensor is adopted as the humidity detection of the external environment as a standard, the first humidity sensor is adopted to detect the humidity in the oven 2 in real time, the change of the humidity is accelerated along with the discharge of the hot humidity by the oven 2 until the humidity is close to the environment, the drying effect of the filter material 11 is realized, the use effect is good, the structure is simple, the absolute humidity value of the first humidity sensor is set to be W1 and W2, the W1 value is the critical point of the humidity and the change of the humidity, the W2 value is the critical point of the change of the humidity, the current environment humidity in the oven 2 is continuously or discontinuously detected by the first humidity sensor, the detected relative humidity value is W, the detected relative humidity value W is respectively compared with the W1 value and the W2 value by the comparison unit, whether the W is larger than the W1 value or not is judged, if the W is larger than the W1 value, the distance between the initial 21 and the filter material 11 is continuously monitored; if not, judging whether the absolute humidity is between the W1 value and the W2 value, if so, judging that the absolute humidity reaches the distance between the heating plate 21 and the filter material 11 to be adjusted, and entering the next relative humidity checking step, if not, judging that the W value is smaller than the W2 value, and if so, judging that the absolute humidity reaches the distance between the heating plate 21 and the filter material 11 to be adjusted, wherein the drying effect of the filter material 11 can be realized according to the change condition of the humidity, and the device is high in practicability and simple in structure;
In order to improve the drying precision, through the condition of entering ambient temperature and humidity to the second humidity transducer, when then having improved and having carried out the contrast, can ensure present ambient humidity to the phenomenon that does not dry filter material 11 does not exist takes place, if the humidity of environment is great, then can the value control heating duration of hot plate 21 according to setting for humidity, the practicality promotes greatly.
When the time of the second humidity sensor in the relative humidity detection state is set to be Tp by the timing unit, the condensation state of the hot air is to be relieved, in the step S9, the time of the second humidity sensor in the relative humidity detection state is continuously recorded to be T2 by the timing unit, when the time of T2 is greater than Tp, the control unit is required to start the hot air system to defrost the condensation state.
In the embodiment of the invention, the second humidity sensor is used as a reference to ensure that after drying, the drying load is reduced and the drying efficiency is increased under the criterion of ambient humidity.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention, but one skilled in the art can make common changes and substitutions within the scope of the technical solution of the present invention.