Waste gas filtering device of PU tire production equipment

Abstract

The invention belongs to the technical field of waste gas filtering, and particularly relates to a waste gas filtering device of PU (polyurethane) tire production equipment, which comprises a shell and a controller fixed on the side wall of the shell, and further comprises a gas inlet unit, a gas outlet unit and a gas outlet unit, the partition plate is fixed in the shell, a plurality of square cylinders are fixedly inserted into the side wall of the partition plate and the end part of the shell, two filter screen covers are arranged in the square cylinders in a sliding manner, the filter screen covers are filled with filter fillers, and exhaust pipes are fixedly inserted into the bottoms of the square cylinders. The PU tire waste gas treatment device can keep smooth and stable airflow, avoid blockage of the filtering filler, improve the PU tire waste gas treatment efficiency, can replace the filtering filler on line, does not need to stop, improves the use convenience of equipment, can pump back residual waste gas during material replacement, prevents the waste gas from escaping, and ensures the use safety of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of exhaust gas filtration technology, and in particular relates to an exhaust gas filtration device for PU tire production equipment. Background Technology

[0002] In the production of PU tires, processes such as raw material mixing, casting and curing, and demolding and cleaning can generate waste gas containing isocyanates, VOCs and particulate matter due to the volatilization of raw materials and the release of reaction by-products. These pollutants are toxic and can easily harm human health and pollute the environment. They must be treated to meet emission standards in order to satisfy environmental protection requirements.

[0003] During the production of PU tires, volatile raw material components and reaction byproducts generated at high temperatures condense into a mixture of sticky resin particles and carbonized residue. To prevent these particles from affecting the subsequent treatment of isocyanate and other waste gases, they need to be filtered and intercepted. However, when filtering particles with activated carbon, the particles gradually clog the pores of the activated carbon due to its long-term static state, gradually affecting the airflow. This leads to a significant decrease in waste gas treatment efficiency, allowing pollutants such as isocyanate and VOCs to penetrate and be emitted, and also wastes some activated carbon, increasing maintenance frequency. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing an exhaust gas filtration device for PU tire production equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an exhaust gas filtration device for PU tire production equipment, comprising a housing and a controller fixed to the side wall of the housing, and further comprising:

[0006] An air intake unit is installed at the air intake end of the housing;

[0007] A partition is fixed inside the outer shell, and several square tubes are fixedly inserted into the side wall of the partition and the end of the outer shell. Two filter screens are slidably installed inside the square tubes, and the filter screens are filled with filter filler. An exhaust pipe is fixedly inserted into the bottom of the square tubes, and the exhaust pipe is located on the side of the partition away from the air intake unit.

[0008] A drive unit is installed inside the square tube, and the drive unit drives the filter screen to move along the inside of the square tube;

[0009] The exhaust pipe is fixedly inserted into the side wall of the outer casing and is located on the same side of the partition as the exhaust pipe.

[0010] The receiving unit is installed at the bottom of the housing on the side near the air intake unit.

[0011] In the exhaust gas filtration device of the above-mentioned PU tire production equipment, the air intake unit includes a mounting cover fixed to the air intake end of the outer shell. A flow equalization plate is fixed inside the mounting cover, and a plurality of flow equalization holes are opened on the side wall of the flow equalization plate. An air intake pipe is fixedly inserted into the side of the mounting cover away from the outer shell.

[0012] In the exhaust gas filtration device of the above-mentioned PU tire production equipment, the drive unit includes a slot box disposed on the outside of the outer shell, and the slot box is fixedly inserted into the bottom of the square tube. A pusher frame is slidably connected inside the square tube, and a screw drive assembly for driving the pusher frame to move along the square tube is installed inside the slot box. The screw drive assembly is electrically connected to the controller.

[0013] In the exhaust gas filtration device of the aforementioned PU tire production equipment, a gas flow rate detection probe is fixed to the side wall of the exhaust pipe, and the detection end of the gas flow rate detection probe is located inside the exhaust pipe. The controller controls the screw drive assembly to work according to the electrical signal fed back by the gas flow rate detection probe.

[0014] In the exhaust gas filtration device of the aforementioned PU tire production equipment, the receiving unit includes a hopper fixedly inserted into the bottom of the outer shell, and the hopper is located on the side of the partition near the air inlet unit. The bottom of the hopper is equipped with a removable bottom cover.

[0015] In the exhaust gas filtration device of the above-mentioned PU tire production equipment, the top of the square cylinder is provided with a material exchange port located on the outer side of the outer shell, and the material exchange port is detachably equipped with a top cover. The side wall of the outer shell is equipped with a material exchange suction mechanism, which is connected to the material drop hopper and the square cylinder.

[0016] In the exhaust gas filtration device of the aforementioned PU tire production equipment, the material exchange and suction mechanism includes an air box fixed to the outer wall of the outer shell. A horizontal suction pipe with a sealed end is fixedly connected to the side wall of the air box. Several branch suction pipes with control valves are fixedly connected to the wall of the horizontal suction pipe. A square cylinder is connected to the corresponding branch suction pipe. An upper gate valve is installed inside the square cylinder between two filter screens. A vertical suction pipe with a control valve is fixedly connected to the side wall of the air box and is connected to the inside of the hopper. A lower gate valve is installed inside the hopper above the suction end of the vertical suction pipe. An air pump is fixed to the side wall of the air box, and the suction end of the air pump is connected to the inside of the air box. An air supply pipe connected to the inside of the mounting cover is fixedly inserted to the output end of the air pump. The control valves inside the branch suction pipes, the control valves inside the vertical suction pipes, and the air pump are all electrically connected to the controller.

[0017] In the exhaust gas filtration device of the above-mentioned PU tire production equipment, the side wall of the square cylinder and the side wall of the hopper are provided with air replenishment holes. The suction pipe and the vertical suction pipe are connected to the corresponding air replenishment holes. An air replenishment electric control valve is installed inside the air replenishment hole, and the air replenishment electric control valve is electrically connected to the controller.

[0018] In the exhaust gas filtration device of the aforementioned PU tire production equipment, a limit switch for detecting the position of the pusher frame is fixedly inserted into the end of the square cylinder, and the limit switch is electrically connected to the controller.

[0019] Compared with existing technologies, the advantages of an exhaust gas filtration device for PU tire production equipment are:

[0020] 1. Through the coordinated operation of the housing, controller, air intake unit, baffle, square cylinder, filter screen, filter packing, exhaust pipe and drive unit, the air intake position can be adjusted by driving the filter screen to move, thus maintaining smooth and stable airflow. This avoids particulate matter clogging the filter packing and affecting the treatment effect on PU tire exhaust gas, thereby improving the exhaust gas treatment efficiency.

[0021] 2. Through the coordinated operation of the receiving unit, material replacement port, and top cover, the filter media can be replaced online in conjunction with the drive unit without stopping the machine, effectively improving the ease of use and without affecting the efficiency of waste gas treatment.

[0022] 3. The material replacement and suction mechanism can be set up to draw back the residual exhaust gas inside the square cylinder and the hopper when replacing the filter packing, so as to avoid the direct escape of some residual exhaust gas during material replacement, which would affect the environment and safety, and ensure the safe use of the equipment. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of an exhaust gas filtration device for PU tire production equipment provided by the present invention;

[0024] Figure 2 This is a schematic diagram of the back structure of an exhaust gas filtration device for a PU tire production equipment provided by the present invention;

[0025] Figure 3 This is a side perspective structural diagram of an exhaust gas filtration device for PU tire production equipment provided by the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the outer shell of the exhaust gas filtration device for a PU tire production equipment provided by the present invention;

[0027] Figure 5 This is a schematic diagram of the connection structure between the square cylinder and the partition plate of the exhaust gas filtration device for PU tire production equipment provided by the present invention;

[0028] Figure 6 This is a schematic diagram of the bottom structure of the square cylinder of the exhaust gas filtration device for a PU tire production equipment provided by the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the square tube of the exhaust gas filtration device for a PU tire production equipment provided by the present invention.

[0030] In the diagram: 1. Outer shell, 2. Controller, 3. Air intake unit, 31. Mounting cover, 32. Flow equalization plate, 33. Flow equalization hole, 34. Air intake pipe, 4. Partition plate, 5. Square cylinder, 6. Filter screen cover, 7. Exhaust pipe, 8. Drive unit, 81. Slot box, 82. Push frame, 83. Screw drive assembly, 9. Air outlet pipe, 10. Receiving unit, 101. Drop hopper, 102. Bottom cover, 11. Gas flow rate detection probe, 12. Top cover, 13. Material changing and suction mechanism, 131. Air box, 132. Horizontal suction pipe, 133. Dividing suction pipe, 134. Upper gate valve, 135. Vertical suction pipe, 136. Lower gate valve, 137. Air pump, 138. Air delivery pipe, 14. Air replenishment hole, 15. Air replenishment electric control valve, 16. Limit switch. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] like Figures 1-7 As shown, an exhaust gas filtration device for PU tire production equipment includes a housing 1 and a controller 2 fixed to the side wall of the housing 1. It also includes an air intake unit 3, which is installed at the air intake end of the housing 1. The air intake unit 3 includes a mounting cover 31 fixed to the air intake end of the housing 1. A flow equalization plate 32 is fixed inside the mounting cover 31, and a plurality of flow equalization holes 33 are opened on the side wall of the flow equalization plate 32. An air intake pipe 34 is fixedly inserted into the side of the mounting cover 31 away from the housing 1, which can improve the uniformity of exhaust gas entering the housing 1.

[0033] The partition 4 is fixed inside the outer shell 1, and several square tubes 5 are fixedly inserted into the side wall of the partition 4 and the end of the outer shell 1. Two filter screens 6 are slidably installed inside the square tubes 5, and the filter screens 6 are filled with filter filler. An exhaust pipe 7 is fixedly inserted into the bottom of the square tubes 5, and the exhaust pipe 7 is located on the side of the partition 4 away from the air intake unit 3.

[0034] The drive unit 8 is installed inside the square tube 5, and the drive unit 8 drives the filter screen 6 to move along the inside of the square tube 5. The drive unit 8 includes a slot box 81 located on the outside of the outer shell 1, and the slot box 81 is fixedly inserted into the bottom of the square tube 5. A pusher frame 82 is slidably connected inside the square tube 5. A screw drive assembly 83 that drives the pusher frame 82 to move along the square tube 5 is installed inside the slot box 81. The screw drive assembly 83 is electrically connected to the controller 2. The screw drive assembly 83 includes components such as a motor, bearing, screw, and screw nut. The motor drives the screw to rotate, and the screw drives the pusher frame 82 to move through the screw nut.

[0035] A gas flow rate detection probe 11 is fixed to the side wall of the exhaust pipe 7, and the detection end of the gas flow rate detection probe 11 is located inside the exhaust pipe 7. The controller 2 controls the screw drive assembly 83 to work according to the electrical signal fed back by the gas flow rate detection probe 11. The gas flow rate detection probe 11 can detect the gas flow rate and feed back an electrical signal to the controller 2 when the gas flow rate is lower than the threshold.

[0036] The exhaust pipe 9 is fixedly inserted into the side wall of the outer casing 1 and is located on the same side of the partition 4 as the exhaust pipe 7. The receiving unit 10 is installed at the bottom of the outer casing 1 near the air intake unit 3. The receiving unit 10 includes a hopper 101 fixedly inserted into the bottom of the outer casing 1. The hopper 101 is located on the side of the partition 4 near the air intake unit 3. A detachable bottom cover 102 is installed at the bottom of the hopper 101. By opening the bottom cover 102, the filter screen 6 that has fallen into the hopper 101 can be removed.

[0037] The top of the square tube 5 is located on the outside of the outer shell 1 and a material exchange port is provided. The material exchange port is detachably equipped with a top cover 12. The side wall of the outer shell 1 is equipped with a material exchange suction mechanism 13. The material exchange suction mechanism 13 is connected to the hopper 101 and the square tube 5. The top cover 12 is opened and the filter screen 6 is replaced through the material exchange port.

[0038] The material changing and suction mechanism 13 includes an air box 131 fixed to the outer wall of the outer shell 1. A horizontal suction pipe 132 with one end sealed is fixedly connected to the side wall of the air box 131. Several branch suction pipes 133 with control valves are fixedly connected to the wall of the horizontal suction pipe 132. A square cylinder 5 is connected to the corresponding branch suction pipe 133. An upper gate valve 134 is installed inside the square cylinder 5 between two filter screens 6. A vertical suction pipe 135 with a control valve is fixedly connected to the side wall of the air box 131. The vertical suction pipe 135 is connected to the interior of the discharge hopper 101. The interior of the discharge hopper 101... A lower gate valve 136 is installed above the suction end of the vertical suction pipe 135. An air pump 137 is fixed to the side wall of the air box 131, and the suction end of the air pump 137 is connected to the inside of the air box 131. An air supply pipe 138 connected to the inside of the mounting cover 31 is fixedly inserted to the output end of the air pump 137. The control valve inside the branch suction pipe 133, the control valve inside the vertical suction pipe 135, and the air pump 137 are all electrically connected to the controller 2. The vertical suction pipe 135 and the lower gate valve 136 are staggered to avoid the vertical suction pipe 135 affecting the rotation of the valve handle of the lower gate valve 136.

[0039] Both the side wall of the square tube 5 and the side wall of the hopper 101 are provided with air replenishment holes 14. The suction pipe 133 and the vertical suction pipe 135 are connected to the corresponding air replenishment holes 14. An air replenishment electric control valve 15 is installed inside the air replenishment hole 14, and the air replenishment electric control valve 15 is electrically connected to the controller 2. When the air replenishment hole 14 is opened, external air can enter the interior of the square tube 5 through the air replenishment hole 14.

[0040] A limit switch 16 for detecting the position of the pusher 82 is fixedly inserted into the end of the square tube 5, and the limit switch 16 is electrically connected to the controller 2. The limit switch 16 can calculate the position of the pusher 82 by emitting a light beam and calculating the time required to receive the reflected light beam.

[0041] The operating principle of the present invention is explained as follows: The inlet pipe 34 and the outlet pipe 9 are connected to the upstream and downstream exhaust pipes respectively. Under normal operation, the upper gate valve 134 and the lower gate valve 136 are opened. When filtering the exhaust gas, the controller 2 is started.

[0042] Exhaust gas enters the mounting cover 31 from the upstream exhaust gas pipeline via the inlet pipe 34, and then flows evenly into the outer casing 1 through the flow equalization holes 33 of the flow equalization plate 32. The airflow then passes through the filter screen 6 and filter media and exits from the exhaust pipe 7, finally flowing into the downstream exhaust gas pipeline via the outlet pipe 9. Particulate matter in the exhaust gas is adsorbed by the pores of the filter media. As the amount of particulate matter in the filter media pores increases, the effective path of airflow gradually decreases, resulting in a slower airflow velocity through the exhaust pipe 7. When the gas velocity detection probe 11 detects that the airflow velocity is below a threshold, it sends an electrical signal to the controller 2 (this threshold is set based on parameters such as the power of the fan driving the exhaust gas flow). The controller 2 then controls the corresponding screw drive assembly 83 to operate once, driving the pusher frame 82 to push... The filter screen 6 moves (the screw drive assembly 83 includes components such as a motor, bearing, screw, and screw nut). The filter screen 6 on the side closest to the push frame 82 will push the filter screen 6 in direct contact with the exhaust gas outward. At this time, the part of the filter screen 6 extending out of the square tube 5 becomes longer, and the exhaust gas can flow through the filter packing from the side of the filter screen 6. This can effectively ensure the effective path for the exhaust gas to flow through the filter packing and ensure the efficiency of the exhaust gas flow. The displacement distance of the filter screen 6 driven by the screw drive assembly 83 in a single operation is 5 cm. (After the screw drive assembly 83 finishes a single operation, it should wait at least 5 minutes before it can work again to avoid the exhaust gas flow speed being unstable when the filter packing moves, which would cause the electrical signal fed back by the gas flow rate detection probe 11 to be unstable, thus causing the screw drive assembly 83 to malfunction).

[0043] As the pusher 82 moves the filter screen 6, the filter screen 6, which is in direct contact with the exhaust gas, will detach from the square cylinder 5 and fall into the hopper 101. Then it will slide onto the bottom cover 102. At this time, the pusher 82 moves into position. After the limit switch 16 detects that the pusher 82 has moved into position, it will send an electrical signal to the controller 2. At this time, the controller 2 will control the screw drive assembly 83 to drive the pusher 82 to move back to reset. At the same time, it will issue a filter packing replacement prompt. The prompt includes the corresponding limit switch 16 number. After receiving the prompt, the staff can know the position of the square cylinder 5 that needs to be replaced based on the prompt number.

[0044] When replacing the filter media, close the upper gate valve 134 and the lower gate valve 136 inside the hopper 101 at the corresponding positions, and press the material replacement button on the controller 2. At this time, the controller 2 will control the control valve inside the suction pipe 133 and the control valve inside the vertical suction pipe 135 at the corresponding positions to open. At the same time, it will control the air pump 137 to work and control the air replenishment valve 15 at the corresponding positions to open. The air pump 137 will extract the residual waste gas inside the square cylinder 5 and the hopper 101 at the corresponding positions through the air box 131, the horizontal suction pipe 132, the suction pipe 133, and the vertical suction pipe 135, and deliver it to the mounting cover 31 through the air supply pipe 138. Meanwhile, the external air will be replenished into the square cylinder 5 and the hopper 101 through the air replenishment hole 14. After the air pump 137 has been working for 2 minutes, the controller 2 stops it and closes the control valves in the suction pipe 133, the vertical suction pipe 135, and the air replenishment valve 15. At this time, the bottom cover 102 can be opened and the filter screen 6 inside the discharge hopper 101 can be taken out. Then the top cover 12 can be opened and the filter screen 6 with new filter packing can be placed into the square cylinder 5. Due to the sealing effect of the upper gate valve 134 and the lower gate valve 136, the exhaust gas inside the outer shell 1 will not escape. And because the residual exhaust gas inside the square cylinder 5 and the discharge hopper 101 is drawn back into the mounting cover 31 by the air pump 137, not only can the filter packing be replaced online, but the safety of the filter packing replacement will not be affected by the exhaust gas escaping.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An exhaust gas filtration device for a PU tire production equipment, comprising a housing (1) and a controller (2) fixed to the side wall of the housing (1), characterized in that, Also includes: An air intake unit (3) is installed at the air intake end of the housing (1); A partition (4) is fixed inside the outer shell (1), and several square tubes (5) are fixedly inserted into the side wall of the partition (4) and the end of the outer shell (1). Two filter screens (6) are slidably provided inside the square tubes (5), and the filter screens (6) are filled with filter filler. An exhaust pipe (7) is fixedly inserted into the bottom of the square tubes (5), and the exhaust pipe (7) is located on the side of the partition (4) away from the air intake unit (3). A drive unit (8) is installed inside the square tube (5), and the drive unit (8) drives the filter screen (6) to move along the inside of the square tube (5); The exhaust pipe (9) is fixedly inserted into the side wall of the outer casing (1) and is located on the same side of the partition (4) as the exhaust pipe (7); The receiving unit (10) is installed on the bottom side of the housing (1) near the air intake unit (3).

2. The exhaust gas filtration device for a PU tire production equipment according to claim 1, characterized in that, The air intake unit (3) includes a mounting cover (31) fixed to the air intake end of the outer shell (1). A flow equalization plate (32) is fixed inside the mounting cover (31), and a number of flow equalization holes (33) are opened on the side wall of the flow equalization plate (32). An air intake pipe (34) is fixedly inserted into the side of the mounting cover (31) away from the outer shell (1).

3. The exhaust gas filtration device for a PU tire production equipment according to claim 1, characterized in that, The drive unit (8) includes a slot box (81) disposed on the outside of the outer shell (1), and the slot box (81) is fixedly inserted into the bottom of the square tube (5). A pusher (82) is slidably connected inside the square tube (5). A screw drive assembly (83) for driving the pusher (82) to move along the square tube (5) is installed inside the slot box (81). The screw drive assembly (83) is electrically connected to the controller (2).

4. The exhaust gas filtration device for a PU tire production equipment according to claim 3, characterized in that, A gas flow rate detection probe (11) is fixed on the side wall of the exhaust pipe (7), and the detection end of the gas flow rate detection probe (11) is located inside the exhaust pipe (7). The controller (2) controls the screw drive assembly (83) to work according to the electrical signal fed back by the gas flow rate detection probe (11).

5. The exhaust gas filtration device for a PU tire production equipment according to claim 1, characterized in that, The receiving unit (10) includes a hopper (101) fixedly inserted into the bottom of the outer shell (1), and the hopper (101) is located on the side of the partition (4) near the air intake unit (3). The bottom of the hopper (101) is equipped with a removable bottom cover (102).

6. The exhaust gas filtration device for a PU tire production equipment according to claim 5, characterized in that, The top of the square tube (5) is provided with a material exchange port located outside the outer shell (1), and the material exchange port is detachably equipped with a top cover (12). The side wall of the outer shell (1) is equipped with a material exchange suction mechanism (13), which is connected to the hopper (101) and the square tube (5).

7. The exhaust gas filtration device for a PU tire production equipment according to claim 6, characterized in that, The material exchange and suction mechanism (13) includes an air box (131) fixed to the outer wall of the outer shell (1). The side wall of the air box (131) is fixedly connected to a horizontal suction pipe (132) with one end sealed. The wall of the horizontal suction pipe (132) is fixedly connected to several branch suction pipes (133) with control valves. The square tube (5) is connected to the corresponding branch suction pipe (133). The inside of the square tube (5) is equipped with an upper gate valve (134) located between two filter screens (6). The side wall of the air box (131) is fixedly connected to a vertical suction pipe (135) with a control valve. The material hopper (101) is connected to the inside of the material hopper (101). A lower gate valve (136) is installed inside the material hopper (101) above the suction end of the vertical suction pipe (135). An air pump (137) is fixed on the side wall of the air box (131). The suction end of the air pump (137) is connected to the inside of the air box (131). The output end of the air pump (137) is fixedly connected to an air supply pipe (138) that is connected to the inside of the mounting cover (31). The control valve inside the sub-suction pipe (133), the control valve inside the vertical suction pipe (135), and the air pump (137) are all electrically connected to the controller (2).

8. The exhaust gas filtration device for a PU tire production equipment according to claim 7, characterized in that, The side wall of the square tube (5) and the side wall of the hopper (101) are provided with air replenishment holes (14). The suction pipe (133) and the vertical suction pipe (135) are connected to the corresponding air replenishment holes (14). An air replenishment electric control valve (15) is installed inside the air replenishment hole (14), and the air replenishment electric control valve (15) is electrically connected to the controller (2).

9. The exhaust gas filtration device for a PU tire production equipment according to claim 3, characterized in that, The end of the square tube (5) is fixedly connected to a limit switch (16) for detecting the position of the push frame (82), and the limit switch (16) is electrically connected to the controller (2).

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