A temperature control device for tunnel kiln

Abstract

The present application provides a temperature control device for a tunnel kiln, comprising: a temperature collector for real-time acquisition of multiple current temperature signals of multiple preset monitoring points, a temperature processor for obtaining the current highest temperature value according to the multiple current temperature signals, a comparator for comparing the current highest temperature value with the preset standard value, and a frequency conversion controller for controlling the output of a frequency conversion instruction according to the comparison result. The present application obtains the current highest temperature in the kiln by monitoring the real-time temperature of each monitoring point. If the current highest temperature is higher or lower than the preset standard value, the control device sends a corresponding frequency conversion instruction to the fan frequency converter, instructing the fan frequency converter to change the operating frequency of the fan accordingly, so as to automatically perform constant temperature baking according to the set standard temperature during the whole baking process, solve the problem of inaccurate manual temperature control in the current tunnel kiln, stabilize the quality and output of the finished bricks, reduce production costs and improve production efficiency, and meet the needs of users.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel kilns, and in particular to a temperature control device for a tunnel kiln. Background Art

[0002] The structure of the tunnel kiln is divided into two parts: one is the tunnel drying room, the other is the tunnel roasting kiln. The roasting kiln is divided into three sections: preheating zone, roasting zone and cooling zone. The brick making machine dries the green bricks in the drying room, and then enters the roasting kiln to complete preheating, high-temperature roasting and natural cooling in sequence.

[0003] The quality and output indicators of finished bricks are determined by factors such as raw materials, roasting temperature, and roasting time, among which the roasting temperature is the most critical factor. During the firing process of finished bricks, fans are required to continuously exhaust air to assist combustion and burning. Therefore, the roasting temperature of the tunnel kiln is controlled by the fan. The larger the exhaust volume of the fan, the lower the roasting temperature, and the smaller the exhaust volume of the fan, the higher the roasting temperature. However, the roasting temperature of the tunnel kiln in the prior art is observed and controlled by manual experience. When manual temperature control is misjudged, the finished bricks leaving the kiln will often be raw or over-burned, resulting in unstable quality and output of the finished bricks.

[0004] It can be seen that the artificial temperature control method of the tunnel kiln in the prior art will cause the quality and output of the finished bricks to be unstable, increase the production cost, reduce the production efficiency, and fail to meet the actual needs of users. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a tunnel kiln temperature control device, which solves the problem of unstable quality and output of finished bricks caused by the manual temperature control method of the tunnel kiln in the prior art, reduces production costs and improves production efficiency, and meets the needs of users.

[0006] The present invention provides a tunnel kiln temperature control device, the device comprising: a temperature collector, used for real-time collection of a plurality of current temperature signals of a plurality of preset monitoring points in the tunnel kiln; a temperature processor, connected to the temperature collector, used for converting the plurality of current temperature signals into a plurality of current temperature values, and also used for obtaining a current maximum temperature value according to the plurality of current temperature values; a comparator, connected to the temperature processor, used for comparing the current maximum temperature value with a preset standard value, outputting a first level if the current maximum temperature value is less than the preset standard value, and outputting a second level if the current maximum temperature value is greater than the preset standard value; a frequency conversion controller, connected to the comparator and also connected to a fan frequency converter, used for, when receiving the first level, outputting a frequency reduction instruction to the fan frequency converter, so that the fan frequency converter reduces the operating frequency of the fan, thereby raising the current maximum temperature value to the preset standard value, and also used for, when receiving the second level, outputting a frequency increase instruction to the fan frequency converter, so that the fan frequency converter increases the operating frequency of the fan, thereby lowering the current maximum temperature value to the preset standard value.

[0007] The technical principle of the present invention is:

[0008] The temperature collector in the tunnel kiln temperature control device of the present invention collects multiple current temperature signals of multiple preset monitoring points in the tunnel kiln in real time, the temperature processor performs analog-to-digital conversion, filtering processing and numerical conversion on the multiple current temperature signals to obtain multiple current temperature values, and then obtains the maximum temperature value from the multiple current temperature values ​​as the current maximum temperature value of the tunnel kiln, the comparator compares the current maximum temperature value with the preset standard value, when the current maximum temperature value is less than the preset standard value, the comparator outputs a first level to the frequency conversion controller, so that the frequency conversion controller outputs a frequency reduction instruction, when the fan frequency converter receives the frequency reduction instruction, the fan operating frequency is reduced, so that the current high temperature value in the tunnel kiln is heated to the preset standard value; when the current maximum temperature value is greater than the preset standard value, the comparator outputs a second level to the frequency conversion controller, so that the frequency conversion controller outputs a frequency increase instruction, when the fan frequency converter receives the frequency increase instruction, the fan operating frequency is increased, so that the current maximum temperature value in the tunnel kiln is cooled to the preset standard value.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The tunnel kiln temperature control device provided by the present invention obtains the current maximum temperature in the kiln by monitoring the real-time temperature of each monitoring point in the tunnel kiln. If the current maximum temperature is higher or lower than a preset standard value, the temperature control device sends a corresponding frequency conversion instruction to the fan frequency converter, instructing the fan frequency converter to correspondingly change the operating frequency of the fan. The current maximum temperature in the tunnel kiln is adjusted by controlling the exhaust volume in the tunnel kiln, so that the entire roasting process is automatically carried out at a constant temperature according to the set standard temperature, which solves the problem of inaccurate manual temperature control in the tunnel kiln at present, stabilizes the quality and output of the finished bricks, reduces production costs and improves production efficiency, and meets the needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0013] Figure 1 The figure is a schematic structural diagram of a tunnel kiln temperature control device provided by an embodiment of the present invention;

[0014] Figure 2 The figure shows a working flow chart of a tunnel kiln provided by an embodiment of the present invention;

[0015] Figure 3 The figure shows the working principle diagram of the tunnel kiln temperature control device provided by the embodiment of the present invention;

[0016] Figure 4 The figure is a schematic diagram of a temperature frequency conversion curve in a tunnel kiln provided by an embodiment of the present invention;

[0017] Figure 5 Shown is a schematic structural diagram of another tunnel kiln temperature control device provided by an embodiment of the present invention;

[0018] Figure 6 Shown is a schematic diagram of a display in a tunnel kiln temperature control device provided by an embodiment of the present invention;

[0019] Figure 7 Shown is a schematic structural diagram of another tunnel kiln temperature control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The functional units with the same labels in the examples of the present invention have the same and similar structures and functions.

[0021] Embodiment 1

[0022] Figure 1 FIG. 1 is a schematic diagram of a structure of a temperature control device for a tunnel kiln provided by an embodiment of the present invention. Figure 1 As shown, the tunnel kiln temperature control device 100 includes:

[0023] A temperature collector 110 is used to collect multiple current temperature signals of multiple preset monitoring points in the tunnel kiln in real time;

[0024] The temperature processor 120 is connected to the temperature collector 110 and is used to convert the multiple current temperature signals into multiple current temperature values, and is also used to obtain the current highest temperature value according to the multiple current temperature values;

[0025] A comparator 130, connected to the temperature processor 120, for comparing the current maximum temperature value with a preset standard value, and outputting a first level if the current maximum temperature value is less than the preset standard value, and outputting a second level if the current maximum temperature value is greater than the first preset standard value;

[0026] The frequency conversion controller 140 is connected to the comparator 130 and also connected to the fan frequency converter 200. When the first level is received, the frequency conversion controller 140 outputs a frequency reduction instruction to the fan frequency converter 200 so that the fan frequency converter 200 reduces the operating frequency of the fan, thereby raising the current maximum temperature value to the preset standard value. When the second level is received, the frequency conversion controller 140 outputs a frequency increase instruction to the fan frequency converter 200 so that the fan frequency converter 200 increases the operating frequency of the fan, thereby lowering the current maximum temperature value to the preset standard value.

[0027] Figure 2 The tunnel kiln working process diagram provided by the embodiment of the present invention is shown as follows: Figure 2The structure of the tunnel kiln shown is divided into two parts: one is the tunnel drying room, and the other is the tunnel roasting kiln. The tunnel roasting kiln is divided into three sections: preheating zone, roasting zone and cooling zone. The kiln door, kiln length, kiln width and kiln height of the drying room and the roasting kiln are the same, facing each other, arranged in parallel, and kiln car running tracks are laid inside and outside. The brick making machine places the finished green bricks (semi-finished products) on the outer track kiln car, and transports them into the drying room along the outer track for drying. The dried green bricks enter the tunnel roasting kiln along the inner track, and complete preheating, high-temperature roasting and natural cooling in the three sections in turn. At a certain interval (about 40 minutes), the green brick kiln car to be fired is pushed into the drying zone, and at the same time, a green brick kiln car that has been dried is pushed into the tunnel kiln, and a kiln car of finished bricks that have been roasted is pushed out. After the finished bricks are unloaded, the empty kiln car is returned to the brick-making workshop along the outer track by a carrier to be loaded with green bricks. The kiln car filled with green bricks is then dried in the drying room, and then preheated, roasted, cooled and unloaded from the tunnel kiln. The whole firing process is repeated over and over again.

[0028] Figure 3 FIG. 1 is a working principle diagram of a tunnel kiln temperature control device provided by an embodiment of the present invention. Figure 3 As shown, an inlet, a preheating zone, a roasting zone, a cooling zone and an outlet are sequentially arranged in the roasting kiln of the tunnel kiln. A plurality of wind gates and roasting fans are arranged in the preheating zone. During the roasting process of the tunnel kiln, the inlet is closed and the outlet is opened. Under the operation of the fan, the normal temperature air outside the tunnel kiln passes through the outlet and sequentially enters the cooling zone, roasting zone and preheating zone in the tunnel kiln, so that there is sufficient air in the tunnel kiln for combustion; and under the operation of the fan, the high temperature air in the tunnel kiln passes through the plurality of wind gates and enters the drying chamber to dry the semi-finished products in the drying chamber.

[0029] It should be noted that due to the structure and working process of the tunnel kiln, the temperature of each section in the tunnel kiln changes according to a certain rule. Figure 4 A schematic diagram of a temperature frequency conversion curve in a tunnel kiln provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the temperature of the preheating zone and the cooling zone in the tunnel kiln will be lower than the temperature of the firing zone, and the temperature of the firing zone is an important factor in determining the quality of the finished bricks. Therefore, controlling the temperature of the firing zone is to control the highest temperature in the tunnel kiln, and at the same time, there is only one highest temperature in the tunnel kiln. The working principle of the tunnel kiln temperature control device provided by the embodiment of the present invention is to control the highest temperature to be maintained within a preset range by monitoring the changes in the highest temperature and changing the operating frequency of the fan.

[0030] A plurality of monitoring points are set at the top of the preheating zone, roasting zone and cooling zone in the tunnel kiln, and temperature sensors are set at the plurality of monitoring points. The distance between the bottom end of the temperature sensor and the top of the kiln car for sintered bricks in the kiln is 6-8 cm. The temperature sensor is used to collect the real-time temperature signal of each monitoring point. In the three sections, one sensor point can be set for every two kiln car positions in the preheating zone and the cooling zone, and one sensor point can be set for every kiln car position in the roasting zone. The roasting zone is a key section that determines the quality and output of sintered bricks. Therefore, one sensor point is set for each kiln car position to more accurately transmit the temperature of each kiln car when firing bricks. The position of the monitoring point can be adjusted according to the structure of the tunnel kiln and the size of the kiln car.

[0031] The detailed working process of this embodiment is as follows: the temperature collector 110 in the tunnel kiln temperature control device 100 collects multiple current temperature signals of multiple preset monitoring points in the tunnel kiln in real time, the temperature processor 120 performs analog-to-digital conversion, filtering processing and numerical conversion on the multiple current temperature signals to obtain multiple current temperature values, and then obtains the maximum temperature value from the multiple current temperature values ​​as the current maximum temperature value of the tunnel kiln, the comparator 130 compares the current maximum temperature value with the preset standard value, when the current maximum temperature value is less than the preset standard value, the comparator outputs a first level to the frequency conversion controller 140, so that the frequency conversion controller 140 outputs a frequency reduction instruction, and the fan frequency converter 200 reduces the operating frequency of the fan when receiving the frequency reduction instruction, so that the current high temperature value in the tunnel kiln is heated to the preset standard value; when the current maximum temperature value is greater than the preset standard value, the comparator outputs a second level to the frequency conversion controller 140, so that the frequency conversion controller 140 outputs a frequency reduction instruction. The controller 140 outputs a frequency increase instruction. When the fan inverter 200 receives the frequency increase instruction, it increases the operating frequency of the fan to cool the current maximum temperature value in the tunnel kiln to a preset standard value. Among them, one or both of the temperature converter and the comparator in this embodiment can be implemented by a single-chip microcomputer or a PLC controller. The preset standard value in the comparator in this embodiment can be set by a reference voltage source. The reference voltage output by the reference voltage source has a one-to-one matching relationship with the temperature value. The comparator is connected to the reference voltage source, and the purpose of modifying the size of the preset standard value can be achieved by adjusting the size of the reference voltage output by the reference voltage source. Of course, in actual applications, the current temperature value output by the temperature converter can also be converted into a corresponding voltage, so that the comparator compares the voltage output by the temperature converter with the reference voltage output by the reference voltage source to obtain a comparison between the current temperature value and the preset standard value, and the comparator outputs a high level or a low level according to the comparison result.

[0032] To further explain, the relationship between the temperature of the tunnel kiln and the operating frequency of the fan is: the higher the operating frequency of the fan, the greater the amount of normal temperature air entering the tunnel kiln from the outlet, and the lower the temperature of the tunnel kiln; conversely, the lower the operating frequency of the fan, the smaller the amount of normal temperature air entering the tunnel kiln from the outlet, and the higher the temperature of the tunnel kiln; therefore, the operating frequency of the fan is adjusted by the current maximum temperature of the tunnel kiln, and then fed back to the current maximum temperature value of the tunnel kiln, so that the entire roasting process is automatically carried out at a constant temperature according to the set standard temperature, which solves the problem of inaccurate manual temperature control of the tunnel kiln, stabilizes the quality and output of the finished bricks, reduces production costs and improves production efficiency, and meets user needs.

[0033] Embodiment 2

[0034] Figure 5 FIG. 1 is a schematic diagram of the structure of another tunnel kiln temperature control device provided by an embodiment of the present invention. Figure 5 As shown, the temperature processor 120 of the tunnel kiln temperature control device 100 is further used to determine a target monitoring point corresponding to the current maximum temperature value according to the current maximum temperature value, and is further used to obtain a first temperature value and a second temperature value of two monitoring points adjacent to the target monitoring point according to the target monitoring point, and is further used to obtain a difference between the first temperature value and the second temperature value;

[0035] The comparator 130 is further configured to compare the difference with a preset difference, and output a third level when the difference matches the preset difference;

[0036] The tunnel kiln temperature control device 100 further includes a feeding module 150 connected to the comparator 130 and configured to output a feeding instruction to control a new kiln car to enter the tunnel kiln when receiving the third level.

[0037] In an embodiment of the present invention, the tunnel kiln temperature control device 100 further includes:

[0038] The standard value calculator 160 is connected to the comparator 130 , and is used to obtain a preset standard value according to the internal combustion parameters of the target to be roasted and the information parameters of the tunnel kiln, and is also used to output the preset standard value to the comparator 130 .

[0039] A power module 170, wherein the input end of the power module 170 is connected to an external power supply, and the output end of the power module 170 is respectively connected to the temperature collector 110, the temperature processor 120, the comparator 130 and the frequency conversion controller 140, and is used to convert the AC voltage of the external power supply into a DC voltage of different standards, and is also used to provide matching DC voltages for the temperature collector 110, the temperature processor 120, the comparator 130 and the frequency conversion controller 140.

[0040] In an embodiment of the present invention, the tunnel kiln temperature control device 100 further includes:

[0041] The mode conversion switch 180 is connected to the fan inverter 200, and is used to enable the fan inverter 200 to receive a frequency reduction instruction or a frequency increase instruction output by the frequency conversion controller 140 when the mode conversion switch 180 is in a first state, and is also used to enable the fan inverter 200 to stop receiving the frequency reduction instruction or the frequency increase instruction output by the frequency conversion controller 140 when the mode conversion switch 180 is in a second state.

[0042] The frequency transceiver 190 is connected to the mode conversion switch 180 and also connected to the fan inverter 200, and is used to receive the fan frequency modification value and send it to the fan inverter 200 when the mode conversion switch 180 is in the second state, so that the fan inverter 200 controls the fan to operate according to the fan frequency modification value.

[0043] In an embodiment of the present invention, the tunnel kiln temperature control device 100 further includes:

[0044] A display is connected to the temperature processor 120 and is used to display multiple temperature values ​​output by the temperature processor 120 in real time; wherein the display is a touch screen.

[0045] It should be noted that, in this embodiment, by identifying the temperature value of the previous point of the highest temperature monitoring point and the temperature value of the next monitoring point, it is determined whether the kiln car at the highest temperature has completed firing, that is, whether a new kiln car needs to be introduced; when the first temperature value of the previous monitoring point of the highest temperature monitoring point matches the second temperature value of the next monitoring point, a feeding instruction is output to control the new kiln car to enter the tunnel kiln, so that the kiln car at the highest temperature enters the cooling zone for natural cooling before leaving the kiln. Figure 6 FIG. 1 is a schematic diagram showing a display of a display in a tunnel kiln temperature control device provided by an embodiment of the present invention, such as Figure 6As shown, for example, the position where the temperature probe 9 is located is the current highest temperature value. The standard for judging whether the kiln car located at the temperature probe 9 has been fired is based on whether the first temperature value collected by the temperature probe 8 matches the second temperature value collected by the temperature probe 10. Among them, the temperatures collected in the present invention have tolerances, so the difference between the first temperature value and the second temperature value within the tolerance range is equivalent to the first temperature value matching the second temperature value.

[0046] Optionally, in this embodiment, by identifying the duration of time that the temperature monitoring point is at the current high temperature value, it can be determined whether the kiln car at the highest temperature has completed firing, that is, whether a new kiln car needs to be introduced; when the duration is the same as the preset duration, a feeding instruction is output to control the new kiln car to enter the tunnel kiln, so that the kiln car at the highest temperature enters the cooling zone for natural cooling before leaving the kiln. It should be noted that due to the structural characteristics of the tunnel kiln, the highest temperature monitoring point may be displaced, such as Figure 6 As shown, for example, the position of temperature probe 9 is the current highest temperature area, but one hour ago, the position of temperature probe 8 may be the highest temperature area, which is the displacement phenomenon of the highest temperature area; when a new kiln car enters, the temperature value of the area where temperature probe 9 is located will drop from the highest point to the temperature value of temperature probe 8. Therefore, this embodiment determines whether the kiln car at the position has been fired by identifying the length of time that the temperature value of the monitoring point where temperature probe 9 is located is at the highest temperature. Therefore, the device automatically identifies and controls the input of new kiln cars, further reducing manual operations and making the device provided by the embodiment of the present invention more intelligent.

[0047] like Figure 6 As shown, the interface displayed on the display in the temperature control device provided by the embodiment of the present invention includes the real-time temperatures collected by each temperature sensor in the drying zone, preheating zone (preheating zone), high temperature zone (baking zone), and cooling zone (cooling zone), and also includes the current operating frequency of the fan, so that the user can clearly grasp the real-time temperature of all monitoring points and the operating frequency of the fan.

[0048] In an embodiment of the present invention, the device further comprises: a housing, the temperature collector, the temperature processor, the comparator and the frequency conversion controller are arranged inside the housing, and the display is embedded on the outer surface of the housing.

[0049] The mode conversion switch is arranged on the outer surface of the housing. When the user places the mode conversion switch in the first state, the tunnel kiln temperature control device is in automatic mode, and the operating frequency of the fan is automatically changed by monitoring the maximum temperature value to achieve the purpose of adjusting the kiln temperature; when the user places the mode conversion switch in the second state, the tunnel kiln temperature control device is in manual mode, and the operating frequency of the current fan is changed by inputting the operating frequency modification value of the fan to achieve the purpose of adjusting the kiln temperature. The working mode of the tunnel kiln temperature control device in this embodiment is switched by the mode conversion switch, so that the user can use the corresponding working mode according to the actual situation of the kiln, further meeting the different needs of the user.

[0050] Embodiment 3

[0051] Figure 7 FIG. 1 is a schematic diagram of the structure of another tunnel kiln temperature control device provided by an embodiment of the present invention. Figure 7 As shown, when the tunnel kiln includes a normally open air damper and a to-be-controlled air damper during operation, the tunnel kiln temperature control device 100 provided by the embodiment of the present invention further includes:

[0052] The wind damper controller 141 is connected to the comparator 130 and also connected to the wind damper to be controlled 300. It is used to close the wind damper to be controlled 300 when the first level is received so that the current maximum temperature value is increased to the preset standard value. It is also used to open the wind damper to be controlled 300 when the second level is received so that the current maximum temperature value is reduced to the preset standard value.

[0053] The detailed working process of this embodiment is as follows: when the tunnel kiln wind gate control device of the present invention monitors that the current maximum temperature value is lower than the preset standard value, the wind gate controller closes the wind gate matching the monitoring point, thereby reducing the speed and air volume of cold air outside the tunnel kiln entering the kiln, increasing the temperature inside the kiln, and causing the current maximum temperature value to rise to the preset standard value; if the current maximum temperature value is higher than the preset standard value, the wind gate controller opens the wind gate matching the monitoring point, thereby increasing the speed and air volume of cold air outside the tunnel kiln entering the kiln, reducing the temperature inside the kiln, and causing the current maximum temperature value to drop to the preset standard value.

[0054] The beneficial effects of this embodiment are as follows: the current temperature in the tunnel kiln is adjusted by controlling the exhaust volume and exhaust speed in the tunnel kiln, so that the entire roasting process is automatically carried out at a constant temperature according to the set standard temperature, which solves the problem of unstable quality and output of finished bricks in the method of controlling the tunnel kiln air gate based on manual experience in the prior art, so that the quality and output of the finished bricks tend to be stable, and the production cost is reduced and the production efficiency is improved, meeting the needs of users; the fan and the air gate are controlled simultaneously according to the maximum temperature value, which speeds up the temperature change in the tunnel kiln and reaches the preset temperature value more quickly.

[0055] In an embodiment of the present invention, the device also includes: a magnetic sensor, which is arranged on the wind damper 300 to be controlled, and is used to detect the current position information of the wind damper 300 to be controlled; wherein the wind damper controller 141 is connected to the magnetic sensor, and is also used to control the displacement of the wind damper 300 to be controlled according to the current position information and the output level of the comparator.

[0056] It should be noted that, in the present embodiment, the wind damper 300 to be controlled includes closed, half-open and fully-open states. Since the half-open state involves different degrees of opening of the wind damper, the half-open state presented is also different. Therefore, the present embodiment sets position information for the wind damper to be controlled. For example, when the wind damper is in the closed state, the position information is set to 0, and when the wind damper is in the fully-open state, the position information is set to 12. Different levels of half-open state values ​​are set in sequence between the closed and fully-open states. For example, the position information of the first half-open state is 4, and the position information of the second half-open state is 8. Different levels and different position information values ​​can be set according to actual conditions.

[0057] The magnetic sensor detects the current position information of the wind gate 300 to be controlled in real time according to the opening degree of the wind gate 300 to be controlled, and the wind gate controller 141 controls the further opening degree of the wind gate 300 to be controlled according to the current position information and the level signal output by the comparator 130; for example, if the current temperature of the preset monitoring point is lower than the preset standard temperature, the comparator 130 sends a level signal to close the wind gate to the wind gate controller 141, and the fan controller 141 determines the descending displacement of the wind gate according to the current position information and preset rules detected by the magnetic sensor; when the current temperature of the preset monitoring point is higher than the preset standard temperature, the comparator 130 sends a level signal to open the wind gate to the wind gate controller 141, and the wind gate controller 141 determines the lifting displacement of the wind gate according to the current position information and preset rules detected by the magnetic sensor; therefore, the displacement in this embodiment includes lifting displacement and descending displacement, when the displacement is a positive number, it represents lifting displacement, and when the displacement is a negative number, it represents descending displacement.

[0058] This embodiment detects the wind gate position information through the magnetic sensor, so that the wind gate controller 141 can accurately control the rising and falling values ​​of the wind gate instead of simply closing and opening the wind gate, making the control of the wind gate more accurate and intelligent.

[0059] In this embodiment, the wind gate controller 141 includes: a processor, a solenoid valve and a wind gate driving device; the processor is connected to the magnetic sensor and also connected to the comparator 130, and is used to obtain the displacement of the wind gate 300 to be controlled based on the current position information and the output level of the comparator 130; the solenoid valve is connected to the processor and also connected to the wind gate driving device, and is used to receive instructions from the processor to enable the wind gate driving device to control the wind gate 300 to be controlled to move the corresponding displacement.

[0060] In practical applications, the wind gate drive device can preferably use a hydraulic drive mechanism, and the solenoid valve is used to control the flow direction of the hydraulic drive mechanism to achieve the lifting and lowering of the wind gate.

[0061] The tunnel kiln temperature control device provided by the present invention obtains the current maximum temperature in the kiln by monitoring the real-time temperature of each monitoring point in the tunnel kiln. If the current maximum temperature is higher or lower than a preset standard value, the temperature control device sends a corresponding frequency conversion instruction to the fan inverter, instructing the fan inverter to correspondingly change the operating frequency of the fan, and then adjusts the current maximum temperature in the tunnel kiln by controlling the exhaust volume in the tunnel kiln, so that the whole roasting process is automatically carried out at a constant temperature according to the set standard temperature, which solves the problem of inaccurate manual temperature control of the tunnel kiln since its creation, and makes the product quality of the tunnel kiln tend to be stable for a long time, with high output, reduced internal combustion energy consumption, and a large reduction in external combustion. Even if the firing displacement changes in the high-temperature stage, the present invention can automatically identify, timely correct and maintain the set roasting temperature, and automatically control the matching reasonable air volume, which not only improves the brick output and quality, but also achieves energy saving and consumption saving, reduces production costs and improves production efficiency, and meets the needs of users.

[0062] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0063] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A tunnel kiln temperature control device, characterized in that: The device comprises: A temperature collector, used for collecting multiple current temperature signals of multiple preset monitoring points in the tunnel kiln in real time; A temperature processor, connected to the temperature collector, for converting the multiple current temperature signals into multiple current temperature values, and for obtaining a current maximum temperature value according to the multiple current temperature values; a comparator connected to the temperature processor, and configured to compare the current maximum temperature value with a preset standard value, and output a first level if the current maximum temperature value is less than the preset standard value, and output a second level if the current maximum temperature value is greater than the preset standard value; a frequency conversion controller, connected to the comparator and also connected to the fan frequency converter, for outputting a frequency reduction instruction to the fan frequency converter when receiving the first level, so that the fan frequency converter reduces the operating frequency of the fan, thereby raising the current maximum temperature value to the preset standard value, and for outputting a frequency increase instruction to the fan frequency converter when receiving the second level, so that the fan frequency converter increases the operating frequency of the fan, thereby lowering the current maximum temperature value to the preset standard value; The temperature processor is further used to determine a target monitoring point corresponding to the current maximum temperature value according to the current maximum temperature value, and to obtain a first temperature value and a second temperature value of two monitoring points adjacent to the target monitoring point according to the target monitoring point, and to obtain a difference between the first temperature value and the second temperature value; The comparator is further configured to compare the difference with a preset difference, and output a third level when the difference matches the preset difference; The device also includes: The feeding module is connected to the comparator and is used to output a feeding instruction when receiving the third level, so as to control a new kiln car to enter the tunnel kiln.

2. The tunnel kiln temperature control device according to claim 1, characterized in that: The device also includes: The standard value calculator is connected to the comparator and is used to obtain the preset standard value according to the internal combustion parameters of the target to be roasted and the information parameters of the tunnel kiln, and is also used to output the preset standard value to the comparator.

3. The tunnel kiln temperature control device according to claim 2, characterized in that: The device also includes: A mode conversion switch is connected to the fan inverter and is used to enable the fan inverter to receive a frequency reduction instruction or a frequency increase instruction output by the frequency conversion controller when the mode conversion switch is in a first state, and is also used to enable the fan inverter to stop receiving the frequency reduction instruction or the frequency increase instruction output by the frequency conversion controller when the mode conversion switch is in a second state.

4. The tunnel kiln temperature control device according to claim 3, characterized in that: The device also includes: A frequency transceiver is connected to the mode conversion switch and also to the fan frequency converter, and is used to receive the fan frequency modification value and send it to the fan frequency converter when the mode conversion switch is in the second state, so that the fan frequency converter controls the fan to operate according to the fan frequency modification value.

5. The tunnel kiln temperature control device according to claim 1, characterized in that: When the tunnel kiln includes a normally open air damper and a to-be-controlled air damper during operation, the device further includes: A wind damper controller is connected to the comparator and also to the wind damper to be controlled, and is used for closing the wind damper to be controlled when the first level is received, so that the current maximum temperature value is increased to the preset standard value, and is also used for opening the wind damper to be controlled when the second level is received, so that the current maximum temperature value is reduced to the preset standard value.

6. The tunnel kiln temperature control device according to claim 5, characterized in that: The device also includes: A magnetic sensor, which is arranged on the wind damper to be controlled and is used to detect the current position information of the wind damper to be controlled; Wherein, the wind damper controller is connected to the magnetic sensor, and is also used to control the displacement of the wind damper to be controlled according to the current position information and the output level of the comparator.

7. The tunnel kiln temperature control device according to claim 6, characterized in that: The wind gate controller comprises: processor, solenoid valve and damper drive; The processor is connected to the magnetic sensor and also connected to the comparator, and is used to obtain the displacement of the damper to be controlled according to the current position information and the output level of the comparator; The solenoid valve is connected to the processor and also connected to the damper driving device, and is used to receive instructions from the processor to enable the damper driving device to control the damper to be controlled to move a corresponding displacement.

8. The tunnel kiln temperature control device according to claim 1, characterized in that: The device also includes: A power supply module, the input end of which is connected to an external power supply, and the output end of which is respectively connected to the temperature collector, the temperature processor, the comparator and the frequency conversion controller, for converting the AC voltage of the external power supply into a DC voltage of different standards, and for providing matching DC voltages for the temperature collector, the temperature processor, the comparator and the frequency conversion controller respectively.

9. The tunnel kiln temperature control device according to any one of claims 1 to 8, characterized in that: The device also includes: A display is connected to the temperature processor and is used to display multiple temperature values ​​output by the temperature processor in real time.

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