Tail gas spraying and washing device for hot pressing of particle board

Abstract

The application discloses a tail gas spraying and washing device for hot pressing of particle boards, which comprises a spraying tower shell, a partition plate, a rotating plate, a vertical pipe, a first horizontal pipe, a second horizontal pipe, a third horizontal pipe, a liquid supply mechanism, an air extraction mechanism, a driving mechanism, an angle encoder, a pressure sensor and a controller. After the tail gas enters the lower washing cavity, it is communicated into the upper washing cavity through the first through hole and the second through hole and receives two-stage spraying and washing. The controller judges the through hole alignment state according to the real-time angle, controls the first through hole to be washed by the dredging assembly when alignment, and executes the compensation control of prolonging the residence time and improving the liquid supply output when the real-time pressure value is lower than the threshold value, so that the through hole dredging effect, the processing liquid utilization rate and the device operation stability are improved.

Description

Technical Field

[0001] This invention belongs to the field of industrial waste gas purification technology, and in particular relates to a tail gas spray washing device for hot pressing of granular plates. Background Technology

[0002] During the hot pressing process of granulated plates, exhaust gas is continuously generated. This gas is typically collected by a gas collection hood and then sent to a spray scrubbing unit for treatment. Most existing spray scrubbing units rely on the contact between the spray liquid and the exhaust gas to achieve washing and purification. The basic idea is to create a spray zone within the tower, allowing the exhaust gas to come into contact with the liquid droplets during its flow and complete the treatment. For the hot pressing of granulated plates, the exhaust gas typically needs to pass through both a lower and upper scrubbing zone after entering the spray tower to improve the contact between the exhaust gas and the treatment liquid and enhance the washing effect.

[0003] However, during continuous operation of the unit, adhering impurities, droplets, and particulate matter in the exhaust gas tend to gradually deposit in the baffle plate through-holes, the transition between the upper and lower chambers, and local flow channels. This is especially true when the exhaust gas flows upwards through fixed orifices for extended periods, making it easier for deposits and blockages to form on the inner walls and edges of the through-holes. Blockage of the through-holes affects the connection between the lower and upper washing chambers, causing localized poor flow, abnormal pressure differences, reduced exhaust gas disturbance, and a decrease in overall washing efficiency. Furthermore, if the spray liquid operates along a fixed trajectory for an extended period, while it can perform routine washing of the exhaust gas within the tower, it lacks targeted treatment for blockages inside the baffle plate through-holes, making it difficult to simultaneously achieve both exhaust gas washing and through-hole unblocking.

[0004] To address these issues, existing devices employ rotary spraying or additional flushing mechanisms for auxiliary cleaning of localized areas. However, these control methods primarily rely on continuous liquid supply, fixed-duration flushing, or simple timed start-stop, making it difficult to precisely control the flushing timing based on the actual alignment of the first and second through-holes. This often results in premature spraying before alignment or continued spraying even after misalignment, leading to low utilization of the treated liquid and insufficient effective time for addressing blockages. Furthermore, existing flushing controls typically lack real-time detection and compensation adjustment of the pressure in the third horizontal pipe branch. When the branch pressure is low, flushing may still proceed according to the preset duration and flow rate, resulting in insufficient unblocking. Conversely, abnormally high branch pressure may increase the risk of pressure on liquid circuit components, affecting stable device operation. Therefore, there is an urgent need for a tail gas spray scrubbing device for granular plate hot pressing that can coordinate control based on through-hole alignment and branch pressure to improve the accuracy of through-hole unblocking, the stability of the washing process, and the overall reliability of the machine. Summary of the Invention

[0005] The purpose of this invention is to provide a tail gas spray washing device for hot pressing of particleboard, so as to solve the problems of tail gas being prone to deposition and blockage due to fixed passage position, lack of fixed-point unblocking, and difficulty in matching the flushing timing with the connection state of the hole.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A tail gas spray scrubbing device for hot pressing of granular plates includes a spray tower shell, a partition plate disposed within the spray tower shell, a rotating plate, a spray assembly, a dredging assembly, a liquid supply mechanism, a suction mechanism, a drive mechanism, an angle encoder, a pressure sensor, and a controller. The partition plate divides the spray tower shell into a lower scrubbing chamber and an upper scrubbing chamber. The partition plate has a first through hole, and the rotating plate has a second through hole that is periodically aligned and communicates with the first through hole. The spray assembly sprays treatment liquid into the lower and upper scrubbing chambers, and the dredging assembly dries the first through hole when it aligns with the second through hole. The hole is flushed and unblocked. The drive mechanism is used to drive the rotating plate, spray assembly and unblocking assembly to rotate synchronously. The controller is electrically connected to the angle encoder, pressure sensor, liquid supply mechanism and drive mechanism respectively. The controller is used to: determine the alignment status of the first through hole and the second through hole according to the real-time angle collected by the angle encoder, and coordinately control the drive mechanism and the liquid supply mechanism based on the alignment status and the real-time pressure value collected by the pressure sensor, so that the unblocking assembly performs fixed-point flushing of the first through hole when aligned, and performs compensation control when the pressure is insufficient.

[0007] Preferably, the liquid supply mechanism includes a liquid storage tank, a material pump, a liquid delivery pipe, a connector, and a pump speed controller; the controller includes a parameter input module, an angle acquisition unit, an alignment determination unit, an execution control unit, a parameter storage unit, a pressure acquisition unit, a pressure compensation unit, and a safety protection unit. The angle acquisition unit is electrically connected to the angle encoder, the pressure acquisition unit is electrically connected to the pressure sensor, and the execution control unit is electrically connected to the opening and closing actuators of the drive mechanism, the liquid supply mechanism, and the unblocking component, respectively.

[0008] Preferably, the parameter storage unit is configured to: record the angle when the second through hole and the corresponding first through hole are fully aligned as the reference alignment angle, and store the reference alignment angles corresponding to each group of second through holes according to the circumferential distribution relationship of multiple groups of second through holes; set a pre-alignment angle range, an effective alignment angle range and a delayed valve closing angle range around each reference alignment angle, and store the basic dwell time, the upper limit of the compensation dwell time, the unblocking pressure threshold and the safety pressure threshold.

[0009] Preferably, the controller is configured to: when the real-time angle has not entered the pre-alignment angle range and the effective alignment angle range, control the drive mechanism to maintain a normal rotation speed, control the unblocking component to be in a closed state, and control the liquid supply mechanism to maintain a basic output; when the real-time angle enters the pre-alignment angle range, control the drive mechanism to switch from a normal rotation speed to a low rotation speed, so that the unblocking component approaches the corresponding first through hole at a lower relative speed.

[0010] Preferably, the controller is further configured to: control the unblocking component to open when the real-time angle enters the effective alignment angle range, allowing the treatment fluid to enter the third horizontal pipe and perform targeted flushing of the first through hole in the alignment state through the unblocking component; control the drive mechanism to maintain low-speed operation according to the basic residence time when the real-time angle leaves the effective alignment angle range and enters the delayed valve closing angle range, control the unblocking component to remain open, and control the unblocking component to close and the drive mechanism to resume normal speed after the real-time angle leaves the delayed valve closing angle range.

[0011] Preferably, the pressure compensation unit is configured to: generate a first compensation command to extend the residence time when the real-time pressure value is lower than the unblocking pressure threshold; the execution control unit controls the drive mechanism to continue operating at a low speed according to the first compensation command, so as to extend the fixed-point flushing time of the unblocking component on the current first through hole; the extension time is determined according to the difference between the real-time pressure value and the unblocking pressure threshold, and the extended total residence time does not exceed the upper limit of the compensation residence time.

[0012] Preferably, the pressure compensation unit is further configured to: after executing the first compensation command, if the real-time pressure value is still lower than the unblocking pressure threshold, generate a second compensation command to increase the output of the liquid supply mechanism; the execution control unit increases the rotational speed or output frequency of the material pump through the pump speed regulator according to the second compensation command, so as to increase the pressure of the treatment liquid entering the third horizontal pipe; the output increase of the material pump is determined according to the difference between the real-time pressure value and the unblocking pressure threshold, and is limited to within a preset maximum output value; when the real-time pressure value recovers to above the unblocking pressure threshold or the compensation dwell time ends, control the liquid supply mechanism to restore the basic output.

[0013] Preferably, the safety protection unit is configured to: when the real-time pressure value is still lower than the unblocking pressure threshold after the output of the liquid supply mechanism is increased and continues to reach the preset judgment time, determine that there is a blockage in the third horizontal pipe or the unblocking component, and control the unblocking component to close, control the drive mechanism to resume normal speed or enter a low-speed safe operation state, and output a maintenance prompt; when the real-time pressure value is higher than the safety pressure threshold, immediately control the unblocking component to close and control the liquid supply mechanism to reduce the output, and output a pressure over-limit prompt.

[0014] Preferably, the unblocking assembly includes a third horizontal pipe fixedly connected to and internally communicating with the vertical pipe, multiple fixed cylinders disposed on the third horizontal pipe, guide cylinders respectively disposed in each fixed cylinder, a movable cylinder sliding along the axial direction of the guide cylinder, a hollow hemispherical head disposed at the lower end of the movable cylinder, and a spring disposed between the hemispherical head and the fixed cylinder; each fixed cylinder is respectively connected to a corresponding second through hole, and multiple unblocking holes communicating with its internal cavity are provided on the arc-shaped surface of the hemispherical head, and the spring is used to apply an elastic force to the hemispherical head extending toward the first through hole; the tail gas spray washing device for hot pressing of particleboard also includes a conductive slip ring, which is electrically connected to the opening and closing actuator and the pressure sensor of the unblocking assembly to maintain power supply and signal transmission when the vertical pipe is rotating.

[0015] Preferably, the spray assembly includes a first horizontal pipe located above the partition and a second horizontal pipe located below the partition. Both the first and second horizontal pipes are connected to the interior of the vertical pipe and are equipped with multiple atomizing nozzles. The driving mechanism includes an adjustable speed drive motor, a vertical rod, and a transmission belt. The air extraction mechanism includes an air extractor, an air extraction pipe, and an air collection hood. An exhaust pipe is provided at the top of the spray tower shell, and a liquid receiving box is provided inside the shell above the rotating plate. A connecting ring, a fixing ring, and multiple inclined liquid guide rods are provided above the liquid receiving box. A first drain pipe and a second drain pipe are also provided on the spray tower shell. The controller is configured to control the exhaust gas to enter the lower washing chamber, first be sprayed and washed through the second horizontal pipe, then enter the upper washing chamber through the connecting channel formed by the first and second through holes, be sprayed and washed through the first horizontal pipe, and then be discharged through the exhaust pipe. At the same time, some of the sprayed droplets flow along the liquid guide rods into the liquid receiving box and are discharged through the second drain pipe.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention uses a controller combined with an angle encoder to determine the phase relationship between the rotating plate and the partition in real time. Based on the reference alignment angle, pre-alignment angle range, effective alignment angle range, and delayed valve closing angle range, the drive mechanism is slowed down when the second through-hole approaches the corresponding first through-hole. After entering the effective alignment state, the unblocking component is opened, ensuring that the treatment fluid, through the third horizontal pipe and unblocking hole, only acts on the corresponding first through-hole during the actual alignment stage. This not only reduces ineffective spraying during non-alignment stages and improves the utilization rate of the treatment fluid, but also matches the timing of the fixed-point flushing with the through-hole's connectivity, thereby enhancing the removal capability of deposits on the inner wall and edge of the first through-hole. Simultaneously, low-speed approach control reduces the impact when the hemispherical head enters the orifice, improving the smoothness of the unblocking process.

[0017] 2. After the unblocking component is activated, the present invention collects real-time pressure values ​​through the pressure sensor in the third horizontal pipe branch, and the pressure compensation unit compares the real-time pressure values ​​with the unblocking pressure threshold. When the real-time pressure value is insufficient, a first compensation control to extend the residence time is executed first, and then a second compensation control to increase the output of the material pump is executed if necessary. This allows the unblocking component to obtain a longer effective flushing time and a higher flushing pressure during the alignment stage, thereby avoiding insufficient unblocking caused by relying solely on a fixed flushing time and a fixed liquid supply pressure. At the same time, the safety protection unit can also promptly close the unblocking branch, reduce the liquid supply output, and issue an alarm when compensation fails or the pressure exceeds the safety pressure threshold. This balances the unblocking effect of the first through hole, the stability of the conventional spraying of the first and second horizontal pipes, and the operational safety of the liquid circuit system. Attached Figure Description

[0018] Figure 1 This invention provides a three-dimensional tail gas spray washing device for hot pressing of particleboard. Figure 1 ; Figure 2 This invention provides a three-dimensional tail gas spray washing device for hot pressing of particleboard. Figure 2 ; Figure 3 This is a cross-sectional view of the spray tower shell in this invention; Figure 4 This is a schematic diagram of the assembly structure of the partition plate, rotating plate, vertical tube, first horizontal tube, second horizontal tube and drive motor in this invention; Figure 5 This is a perspective view of the partition in this invention; Figure 6 This is a schematic diagram of the assembly structure of the rotating plate and the unblocking component in this invention; Figure 7 This is a three-dimensional structural diagram of the unblocking component in this invention; Figure 8 This is a schematic diagram of the assembly structure of the liquid receiving box, connecting ring, fixing ring and liquid guiding rod in this invention.

[0019] Reference numerals: 100, base plate; 111, spray tower shell; 1111, first drain pipe; 1112, second drain pipe; 112, exhaust pipe; 113, partition plate; 1131, first through hole; 114, rotating plate; 115, second through hole; 116, vertical pipe; 1161, angle encoder; 117, first horizontal pipe; 118, second horizontal pipe; 119, atomizing nozzle; 121, air extractor; 122, air extraction pipe; 123, air collection hood; 130, liquid supply mechanism; 131. 132. Storage tank; 133. Material pump; 134. Infusion pipe; 135. Connector; 136. Display controller; 147. Drive motor; 148. Vertical rod; 149. Transmission belt; 150. Unblocking assembly; 151. Third horizontal pipe; 152. Solenoid valve; 153. Fixed cylinder; 154. Guide cylinder; 155. Movable cylinder; 156. Hemispherical head; 157. Unblocking hole; 158. Spring; 160. Liquid receiving box; 171. Connecting ring; 172. Fixed ring; 173. Guide rod. Detailed Implementation

[0020] To make the objectives, features, and advantages of this invention more apparent and understandable, specific embodiments of the invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort should fall within the protection scope of this invention.

[0021] Numerous specific details are set forth in the following description to provide a thorough understanding of the invention; however, the invention may also be practiced in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the invention, and therefore the invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different locations throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0023] Example 1: like Figures 1 to 8 As shown, a tail gas spraying and washing device for hot pressing of granular plates includes a spray tower shell 111, a partition 113, a rotating plate 114, a spraying assembly, a dredging assembly 150, a liquid supply mechanism 130, an air extraction mechanism, a drive mechanism, an angle encoder 1161, a pressure sensor, and a controller.

[0024] The spray tower shell 111 is mounted on the base plate 100. A partition 113 is disposed inside the spray tower shell 111, dividing the spray tower shell 111 into a lower washing chamber and an upper washing chamber. The partition 113 has multiple sets of first through holes 1131 spaced apart circumferentially. A rotating plate 114 is disposed above the partition 113 and can rotate relative to the partition 113. The rotating plate 114 has second through holes 115 that are periodically aligned and connected with the first through holes 1131. The spray assembly includes a first horizontal pipe 117 located above the partition 113 and a second horizontal pipe 118 located below the partition 113. Both the first horizontal pipe 117 and the second horizontal pipe 118 are connected to the interior of the vertical pipe 116 and are each provided with multiple atomizing nozzles 119.

[0025] A vertical pipe 116 is rotatably mounted at the center of the top surface of the spray tower shell 111. The vertical pipe 116 passes through the partition plate 113 and the rotating plate 114. The vertical pipe 116 is fixedly connected to the rotating plate 114 and rotatably connected to the partition plate 113. In this embodiment, the rotating end of the angle encoder 1161 is fixedly connected to the vertical pipe 116, and the stationary end is fixedly connected to the spray tower shell 111 or its mounting bracket to detect the rotation angle of the vertical pipe 116 relative to the spray tower shell 111. Since the vertical pipe 116 is fixedly connected to the rotating plate 114, the rotation angle collected by the angle encoder 1161 can represent the phase position of the rotating plate 114 relative to the partition plate 113, thereby determining whether the second through hole 115 enters the angle range aligned with the first through hole 1131.

[0026] The drive mechanism includes an adjustable speed drive motor 141, a vertical rod 142, and a transmission belt 143. The drive motor 141 drives the vertical tube 116 to rotate, and the vertical tube 116 drives the rotating plate 114, the first horizontal tube 117, the second horizontal tube 118, and the third horizontal tube 151 to rotate synchronously. When the drive motor 141 adopts a servo system, the normal speed can be set to 6-20 r / min, the low-speed alignment speed can be set to 0.5-3 r / min, the basic dwell time can be set to 0.1-0.8 s, and the upper limit of the compensated dwell time can be set to 0.5-5 s. The above parameters can be adjusted according to the diameter of the first through hole 1131, the circumferential pitch of the rotating plate 114, the viscosity of the treated liquid, and the dust content of the exhaust gas.

[0027] like Figure 1 and Figure 2As shown, the liquid supply mechanism 130 includes a storage tank 131, a material pump 132, a delivery pipe 133, a connector 134, a display controller 135, and a pump speed controller (not shown). The storage tank 131 is mounted on the base plate 100 and is used to store the treatment liquid. The treatment liquid can be clean water, circulating water, alkaline absorbent, or a composite washing liquid suitable for the tail gas of the granular plate hot pressing. The material pump 132 is mounted on the base plate 100, with its suction end extending into the storage tank 131 and its discharge end connected to the delivery pipe 133. The other end of the delivery pipe 133 is connected to the connector 134, which is rotatably connected to and internally communicates with the upper end of the vertical pipe 116. The connector 134 is used to maintain a continuous liquid supply connection between the delivery pipe 133 and the vertical pipe 116 when the vertical pipe 116 rotates. The pump speed controller is electrically connected to the material pump 132 and is used to adjust the output flow and output pressure of the material pump 132 according to control commands.

[0028] like Figure 4 , Figure 6 and Figure 7 As shown, the unblocking assembly 150 includes a third horizontal pipe 151, a solenoid valve 152, a fixed cylinder 153, a guide cylinder 154, a movable cylinder 155, a hemispherical head 156, an unblocking hole 157, a spring 158, and a pressure sensor for the third horizontal pipe branch (not shown). The third horizontal pipe 151 is fixedly connected to and internally communicates with the vertical pipe 116, and rotates synchronously with the vertical pipe 116. The solenoid valve 152 is installed on the branch connecting the third horizontal pipe 151 and the vertical pipe 116. The solenoid valve 152 is a normally closed solenoid valve used to control whether the treatment fluid enters the third horizontal pipe 151. The pressure sensor for the third horizontal pipe branch is installed downstream of the solenoid valve 152 and near the inlet of the third horizontal pipe 151, used to detect the real-time pressure in the branch of the third horizontal pipe 151 after the solenoid valve 152 is opened. Multiple fixed cylinders 153 with bottom openings are installed on the third horizontal tube 151. Each fixed cylinder 153 is fixedly connected to the rotating plate 114 and corresponds to and communicates with the second through holes 115 in the same group. A guide cylinder 154 is fixedly connected to each fixed cylinder 153, and the guide cylinder 154 communicates with the interior of the third horizontal tube 151. A movable cylinder 155 is slidably connected to the portion of the guide cylinder 154 located inside the fixed cylinder 153, and the movable cylinder 155 can move up and down along the axial direction of the guide cylinder 154. A hollow cavity hemispherical head 156 is installed at the lower end of the movable cylinder 155, and the hemispherical head 156 is slidably connected to the fixed cylinder 153. A spring 158 is installed between the planar portion of the hemispherical head 156 and the inner top surface of the fixed cylinder 153. The spring 158 applies a downward elastic force to the hemispherical head 156, causing the hemispherical head 156 to tend to extend towards the first through hole 1131. Multiple dredging holes 157 are provided through the arc-shaped surface of the hemispherical head 156, and the multiple dredging holes 157 are connected to the internal cavity of the hemispherical head 156.

[0029] like Figure 1 and Figure 2 As shown, the extraction mechanism includes an extractor 121, an extraction pipe 122, and a gas collection hood 123. The extractor 121 is mounted on the base plate 100, and the extraction end of the extractor 121 is connected to the extraction pipe 122, which is connected to the gas collection hood 123. The gas collection hood 123 is used to cover the exhaust gas generation area of ​​the granular plate hot pressing equipment to collect the hot pressing exhaust gas. The gas delivery end of the extractor 121 extends into the spray tower shell 111 and is located below the partition plate 113. When the extractor 121 is working, the exhaust gas generated at the granular plate hot pressing station is collected by the gas collection hood 123 and enters the extraction pipe 122, and then is sent by the extractor 121 into the lower washing chamber of the spray tower shell 111.

[0030] like Figure 3 and Figure 8 As shown, a liquid receiving box 160 is installed inside the spray tower shell 111, above the rotating plate 114. The liquid receiving box 160 has an annular structure and is fixedly connected to the inner wall of the spray tower shell 111. Above the liquid receiving box 160, there is a connecting ring 171, two fixing rings 172, and multiple liquid guiding rods 173. The connecting ring 171 is fixedly connected to the inner wall of the spray tower shell 111, the fixing rings 172 are located near the vertical pipe 116, and the liquid guiding rods 173 connect the connecting ring 171 and the fixing rings 172. The liquid guiding rods 173 are arranged in an inclined state, with the end of the liquid guiding rod 173 near the fixing ring 172 being higher and the end of the liquid guiding rod 173 near the connecting ring 171 being lower.

[0031] When the treatment liquid sprayed from the atomizing nozzle 119 on the first horizontal tube 117 comes into contact with the exhaust gas, some of the liquid droplets fall onto the liquid guide rod 173 and flow along the liquid guide rod 173 to the liquid receiving box 160.

[0032] like Figure 3 As shown, a first drain pipe 1111 and a second drain pipe 1112 are installed on the side wall of the spray tower shell 111. The first drain pipe 1111 is used to discharge waste liquid at the bottom of the spray tower shell 111, and the second drain pipe 1112 is used to discharge waste liquid collected in the receiving box 160.

[0033] The controller is integrated into the display controller 135 and is electrically connected to the angle encoder 1161, pressure sensor, drive mechanism, liquid supply mechanism 130 and the opening and closing actuator of the unblocking component 150.

[0034] Furthermore, the controller includes a parameter input module, an angle acquisition unit, an alignment determination unit, an execution control unit, a parameter storage unit, a pressure acquisition unit, a pressure compensation unit, and a safety protection unit.

[0035] The parameter input module is used to receive operating parameters input by the user, such as spraying time, pressure limit, and rotation angle range, and outputs the parameters as digital signals to the execution control unit; the parameter input module is the touch screen of the display controller 135.

[0036] The angle acquisition unit is used to acquire real-time angle signals of the rotating spray mechanism through an angle sensor or encoder and send them to the alignment determination unit for real-time comparison. The alignment determination unit is used to receive the signal from the angle acquisition unit and compare the angle acquisition unit signal with the target spray angle, generate a deviation signal and send it to the execution control unit. The execution control unit is used to control the solenoid valve, pump and drive motor according to the deviation and pressure status signal to ensure accurate spraying.

[0037] The parameter storage unit is used to store the reference alignment angle, pre-alignment angle range, effective alignment angle range, delayed valve closing angle range, basic dwell time, upper limit of compensation dwell time, unblocking pressure threshold, and safety pressure threshold.

[0038] The pressure acquisition unit is used to acquire the real-time pressure value output by the pressure sensor, the pressure compensation unit is used to generate a compensation control command when the real-time pressure value is lower than the unblocking pressure threshold, and the safety protection unit is used to generate a protection control command when the pressure is abnormal or the compensation fails.

[0039] Working principle: During the equipment commissioning phase, the controller receives parameter setting information through the parameter input module. The operator adjusts any set of second through holes 115 to a position that is completely aligned with the corresponding first through hole 1131, and records this position as the reference alignment angle.

[0040] Subsequently, the controller stores the reference alignment angles corresponding to each group of second through holes 115 according to the circumferential distribution relationship of multiple groups of second through holes 115, and sets the pre-alignment angle range, effective alignment angle range and delayed valve closing angle range around each reference alignment angle. At the same time, it sets the basic residence time, the upper limit of the compensation residence time, the unblocking pressure threshold and the safety pressure threshold.

[0041] During normal operation, the extraction mechanism guides the exhaust gas generated by the hot pressing of the particleboard into the lower washing chamber; the liquid supply mechanism 130 delivers the treatment liquid into the vertical pipe 116; the controller controls the opening and closing actuator of the unblocking component 150 to remain closed, allowing the treatment liquid to enter the first horizontal pipe 117 and the second horizontal pipe 118 and be sprayed out through the atomizing nozzle 119. At the same time, the controller controls the drive mechanism to drive the vertical pipe 116 to rotate at a normal speed, so that the first horizontal pipe 117 and the second horizontal pipe 118 form a rotating spray trajectory, and the second through hole 115 forms a periodic intermittent connection with the first through hole 1131, so that the exhaust gas is sprayed and washed sequentially in the lower washing chamber and the upper washing chamber.

[0042] When the real-time angle acquired by the angle acquisition unit enters the pre-alignment angle range, the controller determines that the corresponding second through hole 115 is about to enter the alignment state with the first through hole 1131, and controls the drive mechanism to switch from normal speed to low speed, so that the unblocking component 150 approaches the first through hole 1131 at a lower relative speed. Subsequently, when the real-time angle enters the effective alignment angle range, the controller determines that the first through hole 1131 and the second through hole 115 are in an effective alignment state, and controls the opening and closing actuator of the unblocking component 150 to open, so that some of the treatment fluid enters the third horizontal pipe 151; under the action of the spring 158, the hemispherical head 156 enters the first through hole 1131, and the treatment fluid is sprayed out from the unblocking hole 157 after passing through the guide cylinder 154, the movable cylinder 155 and the hemispherical head 156, so as to perform fixed-point flushing on the current first through hole 1131.

[0043] After the unblocking component 150 is activated, the pressure acquisition unit collects the real-time pressure value and transmits it to the pressure compensation unit. If the real-time pressure value reaches or exceeds the unblocking pressure threshold, the controller controls the drive mechanism to maintain low-speed operation according to the basic residence time and controls the liquid supply mechanism 130 to maintain basic output. If the real-time pressure value is lower than the unblocking pressure threshold, the pressure compensation unit first generates a first compensation control command, and the control unit executes the command to control the drive mechanism to continue to maintain low-speed operation, thereby extending the fixed-point flushing time of the unblocking component 150 on the current first through hole 1131. The extension time is determined based on the difference between the real-time pressure value and the unblocking pressure threshold, and the extended total residence time does not exceed the upper limit of the compensation residence time.

[0044] If the real-time pressure value remains below the unblocking pressure threshold after the first compensation control is executed, the pressure compensation unit further generates a second compensation control command. The execution control unit then uses the pump speed regulator to increase the rotational speed or output frequency of the material pump 132 to increase the pressure of the processing fluid entering the third horizontal pipe 151. This control to increase the output of the fluid supply mechanism 130 is preferably limited to the effective alignment angle range and the compensation dwell time. When the real-time pressure value recovers to above the unblocking pressure threshold, or after the compensation dwell time ends, the controller controls the fluid supply mechanism 130 to resume its basic output. Through the above control, the unblocking component 150 can obtain a longer effective flushing time and a higher flushing pressure when the pressure is insufficient.

[0045] If, after the second compensation control is executed, the real-time pressure value is still lower than the unblocking pressure threshold and continues to reach the preset judgment time, the safety protection unit determines that the third horizontal pipe 151 or the unblocking component 150 is blocked, and controls the unblocking component 150 to close, controls the drive mechanism to resume normal speed or enter low-speed safe operation state, and outputs a maintenance prompt; if the real-time pressure value is higher than the safe pressure threshold, the safety protection unit immediately controls the unblocking component 150 to close, controls the liquid supply mechanism 130 to reduce output, and outputs a pressure over-limit prompt.

[0046] When the real-time angle leaves the effective alignment angle range and enters the delayed valve closing angle range, the controller controls the unblocking component 150 to remain open, so that the hemispherical head 156 continues to spray treatment fluid through the unblocking hole 157 during the process of exiting the first through hole 1131, so as to continuously flush the edge of the opening of the first through hole 1131; after the real-time angle leaves the delayed valve closing angle range, the controller controls the unblocking component 150 to close and controls the drive mechanism to resume normal speed. At the same time, some of the droplets after spraying in the upper washing chamber can flow into the receiving box 160 along the liquid guide rod 173 and be discharged through the second drain pipe 1112; the waste liquid at the bottom of the spray tower shell 111 is discharged through the first drain pipe 1111; and the exhaust gas is discharged through the exhaust pipe 112 after primary spraying in the lower washing chamber and secondary spraying in the upper washing chamber.

[0047] Example 2: Figures 1 to 8 As shown, an example of the operation method of a tail gas spray scrubbing device for hot pressing of particleboard includes the following steps: Step 1: The parameter storage unit calls the pre-set reference alignment angle, pre-alignment angle range, effective alignment angle range, delayed valve closing angle range, basic dwell time, upper limit of compensation dwell time, unblocking pressure threshold and safety pressure threshold; at this time, the controller controls the opening and closing actuator of the unblocking component 150 to remain closed, controls the liquid supply mechanism 130 to be in the basic output state, and controls the drive mechanism to be in the ready-to-start state. Step 2: Start the exhaust fan 121 to draw the exhaust gas generated by the hot pressing of the granular plate into the lower washing chamber at the bottom of the spray tower shell 111 through the gas collection hood 123 and the exhaust pipe 122; at the same time, start the liquid supply mechanism 130 to allow the treatment liquid to enter the first horizontal pipe 117 and the second horizontal pipe 118 through the vertical pipe 116 and be sprayed out by the atomizing nozzle 119 to form conventional spraying conditions in the lower washing chamber and the upper washing chamber. Step 3: The controller controls the drive mechanism to drive the vertical tube 116 to rotate at a normal speed. The vertical tube 116 drives the rotating plate 114, the first horizontal tube 117, the second horizontal tube 118 and the third horizontal tube 151 to rotate synchronously. The second through hole 115 moves periodically relative to the first through hole 1131 with the rotating plate 114, so that the exhaust gas after the initial spray in the lower washing chamber enters the upper washing chamber when the first through hole 1131 and the second through hole 115 are connected, and then receives a second spray washing from the first horizontal tube 117, completing the staged washing process of the exhaust gas. Step 4: Angle encoder 1161 continuously collects the real-time angle of vertical pipe 116 and sends it to controller; controller determines the current position of second through hole 115 based on the correspondence between real-time angle and each reference alignment angle; when the real-time angle enters the pre-alignment angle range corresponding to a certain reference alignment angle, controller determines that the second through hole 115 is about to be aligned with the corresponding first through hole 1131, and then controls the drive mechanism to switch from normal speed to low speed, so that the unblocking component 150 approaches the corresponding first through hole 1131 at a lower relative speed; Step 5: When the real-time angle further enters the effective alignment angle range, the controller determines that the corresponding second through hole 115 and the first through hole 1131 are in an effective alignment state. Then, it controls the opening and closing actuator of the unblocking component 150 to open, so that some of the treatment fluid enters the third horizontal pipe 151 and flows to the corresponding unblocking component 150. At this time, the hemispherical head 156 extends towards the first through hole 1131 under the elastic action, and the treatment fluid is sprayed out through the unblocking hole 157 to perform targeted flushing on the inner wall and orifice area of ​​the first through hole 1131, which is currently in the alignment state. Step Six: After the unblocking component 150 is turned on, the pressure sensor detects the pressure of the third horizontal pipe 151 branch and sends the detection result as a real-time pressure value to the controller. If the real-time pressure value reaches or exceeds the unblocking pressure threshold, the controller determines that the current flushing pressure meets the unblocking requirements, continues to control the drive mechanism to maintain low-speed operation according to the basic residence time, and at the same time controls the liquid supply mechanism 130 to maintain basic output to ensure that the fixed-point flushing is completed stably. Step 7: If the controller detects that the real-time pressure value is lower than the unblocking pressure threshold, it determines that the current unblocking pressure is insufficient. At this time, the controller prioritizes the execution of the first compensation control, that is, to continue to maintain the low-speed operation of the drive mechanism, extend the effective connection time between the current first through hole 1131 and the second through hole 115, thereby extending the fixed-point flushing time of the unblocking component 150 on the first through hole 1131. This extension time can be adjusted according to the difference between the real-time pressure value and the unblocking pressure threshold, and the total residence time after the extension does not exceed the upper limit of the compensation residence time. Step 8: If the real-time pressure value is still lower than the unblocking pressure threshold after the first compensation control is executed, the controller will further execute the second compensation control, that is, increase the speed or output frequency of the material pump 132 through the pump speed regulator to increase the output of the liquid supply mechanism 130, thereby increasing the pressure of the processing liquid entering the third horizontal pipe 151, thereby enhancing the flushing effect of the unblocking component 150 on the current first through hole 1131; when the real-time pressure value recovers to above the unblocking pressure threshold, or after the compensation residence time ends, the controller controls the liquid supply mechanism 130 to restore the basic output; Step 9: When the real-time angle leaves the effective alignment angle range and enters the delayed valve closing angle range, the controller does not immediately close the unblocking component 150, but continues to keep it open, so that the hemispherical head 156 can still spray out the treatment fluid through the unblocking hole 157 during the process of exiting the first through hole 1131, so as to clean the edge of the first through hole 1131 and reduce the residual deposits on the edge of the hole. Step 10: When the real-time angle leaves the delayed valve closing angle range, the controller controls the unblocking component 150 to close and controls the drive mechanism to resume normal speed. The device re-enters the normal spraying and rotating washing state, waiting for the next set of second through holes 115 and the corresponding first through holes 1131 to enter the pre-alignment angle range, so as to repeat the above unblocking and washing cycle. Step 11: If, after executing the second compensation control, the real-time pressure value remains below the unblocking pressure threshold and reaches the preset judgment time, the controller determines that there is a risk of blockage in the third horizontal pipe 151 or the unblocking component 150, and then controls the unblocking component 150 to close, and controls the drive mechanism to resume normal speed or enter a low-speed safe operation state, while outputting a maintenance prompt; if the real-time pressure value is higher than the safe pressure threshold, the controller immediately closes the unblocking component 150 and reduces the output of the liquid supply mechanism 130, while outputting a pressure over-limit prompt to protect the safety of the liquid circuit system and related components; Step 12: During the above operation, some of the droplets sprayed in the upper washing chamber flow into the receiving box 160 along the guide rod 173 and are discharged through the second drain pipe 1112; the waste liquid at the bottom of the spray tower shell 111 is discharged through the first drain pipe 1111; the exhaust gas after washing is finally discharged through the exhaust pipe 112, thus completing a continuous exhaust gas spray washing and hole unblocking operation process.

[0048] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0049] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described above. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A tail gas spray washing device for hot pressing of granular plates, characterized in that, It includes a spray tower shell, a baffle plate disposed inside the spray tower shell, a rotating plate, a spray assembly, a dredging assembly, a liquid supply mechanism, an air extraction mechanism, a drive mechanism, an angle encoder, a pressure sensor, and a controller; The partition divides the spray tower shell into a lower washing chamber and an upper washing chamber. The partition is provided with a first through hole, and the rotating plate is provided with a second through hole that is periodically aligned and connected to the first through hole. The spray assembly is used to spray treatment liquid into the lower and upper washing chambers. The unblocking assembly is used to flush and unblock the first through hole when the first and second through holes are aligned. The driving mechanism is used to drive the rotating plate, the spray assembly, and the unblocking assembly to rotate synchronously. The controller is electrically connected to the angle encoder, pressure sensor, liquid supply mechanism, and drive mechanism, respectively, and the controller is configured to: The alignment status of the first through hole and the second through hole is determined based on the real-time angle collected by the angle encoder. Based on the alignment status and the real-time pressure value collected by the pressure sensor, the drive mechanism and the liquid supply mechanism are controlled in coordination so that the unblocking component performs fixed-point flushing of the first through hole when aligned, and performs compensation control when the pressure is insufficient.

2. The tail gas spray washing device for hot pressing of granular plates according to claim 1, characterized in that, The liquid supply mechanism includes a liquid storage tank, a material pump, a delivery pipe, a connector, and a pump speed controller; The controller includes a parameter input module, an angle acquisition unit, an alignment determination unit, an execution control unit, a parameter storage unit, a pressure acquisition unit, a pressure compensation unit, and a safety protection unit. The angle acquisition unit is electrically connected to the angle encoder, the pressure acquisition unit is electrically connected to the pressure sensor, and the execution control unit is electrically connected to the opening and closing actuators of the drive mechanism, the liquid supply mechanism, and the unblocking component.

3. The tail gas spray washing device for hot pressing of granular plates according to claim 2, characterized in that, The parameter storage unit is configured as follows: Record the angle when the second through hole is perfectly aligned with the corresponding first through hole as the reference alignment angle, and store the reference alignment angle corresponding to each group of second through holes according to the circumferential distribution relationship of multiple groups of second through holes; The system sets pre-alignment angle range, effective alignment angle range, and delayed valve closing angle range around each reference alignment angle, and stores the basic dwell time, the upper limit of the compensation dwell time, the unblocking pressure threshold, and the safety pressure threshold.

4. The tail gas spray washing device for hot pressing of granular plates according to claim 3, characterized in that, The controller is also configured to: When the real-time angle does not enter the pre-alignment angle range or the effective alignment angle range, the drive mechanism is controlled to maintain a normal rotation speed, the unblocking component is controlled to be in the closed state, and the liquid supply mechanism is controlled to maintain basic output. When the real-time angle enters the pre-alignment angle range, the drive mechanism is controlled to switch from normal speed to low speed so that the unblocking component approaches the corresponding first through hole at a lower relative speed.

5. The tail gas spray washing device for hot pressing of granular plates according to claim 4, characterized in that, The controller is also configured to: When the real-time angle enters the effective alignment angle range, the unblocking component is controlled to open, so that the treatment fluid enters the third horizontal pipe and is used by the unblocking component to perform point flushing on the first through hole in the alignment state. When the real-time pressure value reaches or exceeds the unblocking pressure threshold, the drive mechanism is controlled to maintain low-speed operation according to the basic residence time, and the liquid supply mechanism is controlled to maintain basic output. When the real-time angle leaves the effective alignment angle range and enters the delayed valve closing angle range, the unblocking component is kept open, and after the real-time angle leaves the delayed valve closing angle range, the unblocking component is closed and the drive mechanism resumes normal speed.

6. The tail gas spray washing device for hot pressing of granular plates according to claim 5, characterized in that, The pressure compensation unit is configured as follows: When the real-time pressure value is lower than the unblocking pressure threshold, a first compensation command to extend the residence time is generated; The execution control unit controls the drive mechanism to continue operating at a low speed according to the first compensation command, so as to extend the fixed-point flushing time of the unblocking component for the current first through hole; The extended time is determined based on the difference between the real-time pressure value and the unblocking pressure threshold, and the total extended residence time does not exceed the upper limit of the compensated residence time.

7. The tail gas spray washing device for hot pressing of granular plates according to claim 6, characterized in that, The pressure compensation unit is also configured to: If the real-time pressure value is still lower than the unblocking pressure threshold after the first compensation command is executed, a second compensation command to increase the output of the liquid supply mechanism is generated. The execution control unit increases the speed or output frequency of the material pump through the pump speed regulator according to the second compensation command, so as to increase the pressure of the processing liquid entering the third horizontal pipe; The output boost of the material pump is determined based on the difference between the real-time pressure value and the unblocking pressure threshold, and is limited to a preset maximum output value. When the real-time pressure value recovers to above the unblocking pressure threshold or after the compensation dwell time ends, the liquid supply mechanism is controlled to resume basic output.

8. The tail gas spray washing device for hot pressing of granular plates according to claim 7, characterized in that, The security protection unit is configured as follows: When the output of the liquid supply mechanism is increased, if the real-time pressure value is still lower than the unblocking pressure threshold and continues to reach the preset judgment time, it is determined that there is a blockage in the third horizontal pipe or the unblocking component, and the unblocking component is controlled to close, the drive mechanism is controlled to resume normal speed or enter a low-speed safe operation state, and a maintenance prompt is output at the same time. When the real-time pressure value exceeds the safe pressure threshold, the unblocking component is immediately shut down and the liquid supply mechanism is controlled to reduce the output, while an over-limit output pressure warning is issued.

9. The tail gas spray washing device for hot pressing of granular plates according to claim 1, characterized in that, The unblocking assembly includes a third horizontal pipe fixedly connected to and internally connected to the vertical pipe, multiple fixed cylinders disposed on the third horizontal pipe, guide cylinders disposed in each fixed cylinder, a movable cylinder sliding along the axial direction of the guide cylinder, a hollow hemispherical head disposed at the lower end of the movable cylinder, and a spring disposed between the hemispherical head and the fixed cylinder; each fixed cylinder is respectively connected to a corresponding second through hole, and multiple unblocking holes communicating with its internal cavity are provided on the arc-shaped surface of the hemispherical head; the spring is used to apply an elastic force to the hemispherical head extending toward the first through hole; The exhaust gas spraying and washing device for hot pressing of particleboard also includes a conductive slip ring, which is electrically connected to the opening and closing actuator of the unblocking component and the pressure sensor respectively, so as to maintain power supply and signal transmission when the vertical pipe is rotating.

10. The tail gas spray washing device for hot pressing of granular plates according to claim 1, characterized in that, The spray assembly includes a first horizontal pipe located above the partition and a second horizontal pipe located below the partition. Both the first horizontal pipe and the second horizontal pipe are connected to the interior of the vertical pipe and are provided with multiple atomizing nozzles. The driving mechanism includes an adjustable speed drive motor, a vertical rod and a transmission belt; the air extraction mechanism includes an air extractor, an air extraction pipe and an air collection hood; an exhaust pipe is provided at the top of the spray tower shell, and a liquid receiving box is provided inside above the rotating plate; a connecting ring, a fixing ring and multiple inclined liquid guide rods are provided above the liquid receiving box; a first liquid drain pipe and a second liquid drain pipe are also provided on the spray tower shell. The controller is configured to control the exhaust gas to enter the lower washing chamber, first be sprayed and washed by the second horizontal pipe, then enter the upper washing chamber through the connecting channel formed by the first through hole and the second through hole, be sprayed and washed by the first horizontal pipe, and then be discharged by the exhaust pipe. At the same time, some of the sprayed droplets flow along the liquid guide rod into the liquid receiving box and are discharged through the second drain pipe.

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