PTA blanking device

Abstract

The utility model discloses a pure terephthalic acid (PTA) blanking device, which comprises a stock bin, a rotary blanking device, a vibrating screen, a three-way connecting pipe, a measuring wheel and a slurry tank, the three-way connecting pipe comprises a main blanking pipeline and a bypass blanking pipeline connected with the main blanking pipeline, the main blanking pipeline is provided with a blanking main inlet and a blanking main outlet, and the bypass blanking pipeline is provided with a bypass discharge port; the blanking main inlet is connected with the vibrating screen, the blanking main outlet is connected with the measuring wheel, and the bypass discharge port is connected with the slurry tank; the three-way connecting pipe further comprises a material blocking plate rotationally arranged in the main discharging pipeline, and the material blocking plate is provided with a first position and a second position. At the first position, the baffle plate is blocked between the main blanking inlet and the bypass discharge port, and the main blanking inlet is communicated with the main blanking outlet; and when the baffle plate is at the second position, the baffle plate is blocked between the blanking main inlet and the blanking main outlet, and the blanking main inlet is communicated with the bypass discharge port. The PTA blanking device can still realize normal blanking when the measuring wheel breaks down.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester production equipment, and particularly relates to a PTA feeding device. Background Technique

[0002] In the polyester production process, the PTA metering and feeding system is a continuous operating device that feeds the main production raw material PTA from the silo into the slurry tank. Therefore, when the PTA feeding system fails, the supply of the raw material PTA in the polyester production will be interrupted, and the central control needs to control the liquid level in the slurry tank to intervene in the subsequent production. If the production stops for a long time, it will have an irreversible impact on the production capacity and product quality of the device, and even cause the device to stop production.

[0003] Among the major failures that occurred in the previous PTA feeding system, the measuring wheel had a relatively high frequency of problems and required a long processing time. Due to the limited on-site operation space, it was difficult to complete the repair in a short time. Stopping the PTA feeding system for a long time would affect the production stability. Content of the Utility Model

[0004] The purpose of the utility model is to provide a PTA feeding device in which the measuring wheel can still achieve normal feeding under a fault state in view of the deficiencies in the prior art.

[0005] To achieve the above object, the technical solution adopted by the utility model is:

[0006] A PTA feeding device includes a silo, a rotary feeder, a vibrating screen, a three-way connecting pipe, a measuring wheel and a slurry tank sequentially arranged along the feeding path. The three-way connecting pipe includes a main feeding pipeline and a bypass feeding pipeline with one end fixedly connected and communicated with the main feeding pipeline. The upper end of the main feeding pipeline is provided with a main feeding inlet, the lower end of the main feeding pipeline is provided with a main feeding outlet, and the other end of the bypass feeding pipeline is provided with a bypass outlet; the main feeding inlet is connected and communicated with the vibrating screen, the main feeding outlet is connected and communicated with the measuring wheel, and the bypass outlet is connected and communicated with the slurry tank;

[0007] The three-way connecting pipe further includes a baffle plate rotatably arranged in the main feeding pipeline. The baffle plate has a first position and a second position; when the baffle plate is in the first position, the baffle plate blocks between the main feeding inlet and the bypass outlet, the main feeding inlet and the bypass outlet are not communicated, and the main feeding inlet and the main feeding outlet are communicated; when the baffle plate is in the second position, the baffle plate blocks between the main feeding inlet and the main feeding outlet, the main feeding inlet and the main feeding outlet are not communicated, and the main feeding inlet and the bypass outlet are communicated;

[0008] The three-way connecting pipe further includes a driving mechanism for driving the baffle to rotate relative to the main blanking pipe, and the driving mechanism is connected or cooperates with the baffle.

[0009] In some embodiments, the bypass blanking pipe includes a first pipe. One end of the first pipe is connected and communicated with the main blanking pipe. The first pipe is inclined downward relative to the main blanking pipe from the connection part with the main blanking pipe. When the baffle is in the second position, the baffle is inclined downward in the main blanking pipe, and the lower end of the baffle extends to the lowermost position where the first pipe intersects with the main blanking pipe.

[0010] In some embodiments, the three-way connecting pipe further includes a gas passage whose lower end is arranged on the main blanking pipe and communicated with it. The gas passage is inclined in the up-down direction. When the baffle is in the second position, the uppermost end of the baffle is not higher than the lowermost end of the gas passage.

[0011] In some embodiments, when the baffle is in the second position, the extending direction of the baffle is parallel to the extending direction of the first pipe, or the included angle between them is not greater than 5°;

[0012] And / or, when the baffle is in the second position, the extending direction of the baffle is parallel to the extending direction of the gas passage, or the included angle between them is not greater than 5°.

[0013] In some embodiments, when the baffle is in the second position, the spacing distance between the uppermost end of the baffle and the lowermost end of the gas passage is not greater than 5 mm.

[0014] In some embodiments, the main blanking pipe extends in the vertical direction. When the baffle is in the first position, the baffle is located at the connection part of the first pipe and the main blanking pipe, and the baffle extends in the vertical direction.

[0015] In some embodiments, the angle of inclination of the first pipe relative to the main blanking pipe is 50 - 60°.

[0016] In some embodiments, a rotating shaft is fixedly arranged at one end of the baffle. The rotating shaft is rotatably arranged on the main blanking pipe, and at least one end of the rotating shaft extends to the outside of the main blanking pipe. The driving mechanism includes a manual valve rod, and the manual valve rod is fixedly connected to the part of the rotating shaft extending to the outside of the main blanking pipe.

[0017] In some embodiments, the three-way connecting pipe further includes a limiting structure for limiting the rotational position of the baffle plate. The limiting structure includes two limiting rods fixedly arranged outside the main material discharging pipe, and the manual valve rod is rotatably arranged between the two limiting rods; when the baffle plate is in the first position, the manual valve rod abuts against one of the limiting rods; when the baffle plate is in the second position, the manual valve rod abuts against the other limiting rod.

[0018] In some embodiments, the three-way connecting pipe further includes a locking structure for locking the position of the manual valve rod to lock the baffle plate in the first position and the second position. The locking structure includes a locking plate fixedly connected to the two limiting rods at both ends and a locking pin detachably connected to the locking plate; when the locking structure is in the locked state, the locking pin is connected to the locking plate, and the manual valve rod is limited between the limiting rod and the locking pin; when the connection between the locking pin and the locking plate is disengaged, the locking structure is in the unlocked state.

[0019] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art: When the material discharging device of the present utility model is discharging normally, the baffle plate is in the first position, and PTA powder is discharged from the main material discharging outlet; when the measuring wheel fails, the baffle plate can be rotated to the second position, and PTA powder can be discharged from the bypass discharging port, so as to bypass the faulty measuring wheel part in the material discharging device, enabling normal discharging to still be achieved when the measuring wheel is in a faulty state, thus not affecting production, solving the production hidden danger caused by the measuring wheel failure, and also providing time for subsequent treatment of the measuring wheel failure. Description of the Drawings

[0020] Attached Figure 1 is a schematic structural diagram of the PTA material discharging device of this embodiment;

[0021] Attached Figure 2 is a cross-sectional view of the three-way connecting pipe of this embodiment (the baffle plate is in the first position);

[0022] Attached Figure 3 is a side view of the three-way connecting pipe of this embodiment;

[0023] Attached Figure 4 is a cross-sectional view of the three-way connecting pipe of this embodiment (the baffle plate is in the second position);

[0024] Attached Figure 5 is a front view of the three-way connecting pipe of this embodiment (the baffle plate is in the second position).

[0025] Wherein: 1. silo; 2. rotary feeder; 3. vibrating screen; 4. three-way connecting pipe; 41. main feeding pipeline; 411. main feeding inlet; 412. main feeding outlet; 42. bypass feeding pipeline; 421. bypass discharging outlet; 422. first pipeline; 423. second pipeline; 43. baffle plate; 44. rotating shaft; 45. gas passage; 46. manual valve rod; 47. limiting rod; 481. locking plate; 482. locking pin; 5. measuring wheel; 6. slurry tank. Detailed implementation mode

[0026] The technical solutions of the present utility model will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. For example, Figure 1 in the figure, the left side direction in the figure is "left", the right side direction is "right", the upper side direction is "upper", the lower side direction is "lower", and the direction perpendicular to the paper surface in the figure is "front" and "rear". This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] As Figure 1 shown, the PTA feeding device of the present utility model includes a silo 1, a rotary feeder 2, a vibrating screen 3, a three-way connecting pipe 4, a measuring wheel 5 and a slurry tank 6 arranged in sequence along the feeding path.

[0029] As Figures 2 to 5 shown, the three-way connecting pipe 4 includes a main feeding pipeline 41 and a bypass feeding pipeline 42 with one end fixedly connected and communicated with the main feeding pipeline 41. The upper end of the main feeding pipeline 41 is provided with a main feeding inlet 411, the lower end of the main feeding pipeline 41 is provided with a main feeding outlet 412, and the other end of the bypass feeding pipeline 42 is provided with a bypass discharging outlet 421.

[0030] The silo 1, the rotary feeder 2, and the vibrating screen 3 are sequentially connected by pipelines. The measuring wheel 5 and the slurry tank 6 are connected by a pipeline. The main inlet 411 is connected and communicated with the outlet of the vibrating screen 3. The main outlet 412 is connected and communicated with the measuring wheel 5. The bypass outlet 42 is connected and communicated with the slurry tank 6 by a pipeline.

[0031] In this embodiment, the main inlet 411, the main outlet 412, and the bypass outlet 421 all have flanges and are connected to the corresponding components through the flanges.

[0032] The tee connection pipe 4 further includes a baffle 43. The baffle 43 is rotatably arranged in the main feeding pipeline 41. Specifically, the lower end of the baffle 43 is rotatably connected to the main feeding pipeline 41 through a rotating shaft 44. The baffle 43 has a first position and a second position when rotating around the axis of the rotating shaft 44 relative to the main feeding pipeline 41.

[0033] When the baffle 43 is in the first position, the baffle 43 blocks between the main inlet 411 and the bypass outlet 421, so that the main inlet 411 and the bypass outlet 412 are not communicated. At this time, the main inlet 411 and the main outlet 412 are communicated, as Figure 2 shown. After the PTA powder flows out from the outlet of the vibrating screen 3, it can enter the main feeding pipeline 41 from the main inlet 411, flow out of the tee connection pipe 4 from the main outlet 412, and flow into the slurry tank 6 after passing through the measuring wheel 5.

[0034] When the baffle 43 is in the second position, the baffle 43 blocks between the main inlet 411 and the main outlet 412, so that the main inlet 411 and the main outlet 412 are not communicated, and the main inlet 411 and the bypass outlet 421 are communicated, as Figure 4 shown. After the PTA powder flows out from the outlet of the vibrating screen 3, it can enter the bypass feeding pipeline 42 from the main inlet 411, and flow into the slurry tank 6 after flowing out of the tee connection pipe 4 from the bypass outlet 421.

[0035] With this setting, when the measuring wheel 5 fails, the baffle 43 can be rotated to the second position, so that the PTA powder can be fed from the bypass outlet 421, thereby bypassing the faulty measuring wheel 5 in the feeding device, enabling normal feeding to still be achieved when the measuring wheel 5 is in a faulty state, thus not affecting production, solving the production hidden danger caused by the failure of the measuring wheel 5, and also providing time for subsequent troubleshooting of the measuring wheel 5.

[0036] The main feeding pipeline 41 extends in the vertical direction. In this way, the PTA powder can flow along the main feeding pipeline 41 under the action of its own gravity, making it not easy for the PTA powder to deposit on the inner wall of the main feeding pipeline 41.

[0037] The bypass feeding pipeline 42 includes a first pipeline 422. One end of the first pipeline 422 is connected and communicated with the main feeding pipeline 41. The first pipeline 422 is inclined downward relative to the main feeding pipeline 41 from the connection part with the main feeding pipeline 41.

[0038] When the baffle 43 is in the first position, the baffle 43 is located at the connection part of the first pipeline 422 and the main feeding pipeline 41, and the baffle 43 extends in the vertical direction. In this way, the setting of the baffle 43 does not affect the feeding of PTA powder in the main feeding pipeline 41, and the PTA powder is not easy to deposit on the baffle 43.

[0039] When the baffle 43 is in the second position, the baffle 43 is inclined downward from top to bottom in the main feeding pipeline 41, and the lower end of the baffle 43 extends to the lowest position where the first pipeline 422 intersects with the main feeding pipeline 41. Preferably, the extending direction of the baffle 43 is parallel to the extending direction of the first pipeline 422, or a small included angle between the two is also acceptable, such as the included angle between the two is not more than 5°. With this setting, it is not easy for the PTA powder to pile up, thus avoiding the problem that the passage between the main feeding inlet 411 and the bypass discharge port 421 is blocked and emergency feeding cannot be carried out.

[0040] In this embodiment, the inclination angle of the first pipeline 422 relative to the main feeding pipeline 41 is 50 - 60°, preferably 55°.

[0041] The bypass discharge port 421 can be directly arranged at the other end of the first pipeline 422, such as Figure 2 , Figure 4 and Figure 5 shown. At this time, a connecting pipe can be connected to the slurry tank 6, and the bypass discharge port 421 and the connecting pipe are connected by a flange.

[0042] As Figure 1 shown, the bypass feeding pipeline 42 can also include a second pipeline 423. The second pipeline 423 is integrally arranged or fixedly connected with the first pipeline 422. One end of the second pipeline 423 is sequentially connected to the other end of the first pipeline 422. At this time, the bypass discharge port 421 is arranged at the other end of the second pipeline 423. The second pipeline 423 extends in the vertical direction, and the second pipeline 423 is connected to the slurry tank 6.

[0043] The three-way connecting pipe 4 further includes a gas channel 45. The gas channel 45 is inclined in the up and down direction. The lower end of the gas channel 45 is connected to and communicated with the main feeding pipeline 41. The upper end of the gas channel 45 can be communicated with a gas source device to introduce nitrogen into the gas channel 45, so as to purge the PTA powder on the baffle 43, prevent material accumulation, and thus avoid pipeline blockage.

[0044] When the baffle 43 is in the second position, the uppermost end of the baffle 43 is not higher than the lowermost end of the gas passage 45, and the spacing distance between the uppermost end of the baffle 43 and the lowermost end of the gas passage 45 is not greater than 5 mm. Preferably, the extending direction of the baffle 43 is parallel to the extending direction of the gas passage 45, or a small included angle between the two is also acceptable, such as the included angle between the two is not greater than 5°.

[0045] A control valve is provided on the gas passage 45. When the baffle 43 is in the second position, the control valve makes the gas passage 45 in a connected state, and at this time, the nitrogen in the gas source device can be blown to the baffle 43 through the gas passage 45. When the baffle 43 is in the first position, the control valve makes the gas passage 45 in a disconnected state, and at this time, the nitrogen in the gas source device cannot enter the main blanking pipe 41.

[0046] The three-way connecting pipe 4 further includes a driving mechanism for driving the baffle 43 to rotate relative to the main blanking pipe 41, so that the baffle 43 is switched between the first position and the second position, and the driving mechanism is connected or cooperated with the baffle 43.

[0047] In this embodiment, as Figure 3 and Figure 5 shown, the rotating shaft 44 is fixedly arranged at the lower end of the baffle 43, the rotating shaft 44 is rotatably arranged on the main blanking pipe 41, and at least one end of the rotating shaft 44 extends to the outside of the main blanking pipe 41. The driving mechanism includes a manual valve rod 46, and the manual valve rod 46 is fixedly connected to the part of the rotating shaft 44 that extends to the outside of the main blanking pipe 41. When the manual valve rod 46 is manually operated to rotate, the manual valve rod 46 drives the rotating shaft 44 to rotate relative to the main blanking pipe 41, so that the baffle 43 rotates relative to the main blanking pipe 41 synchronously with the rotating shaft 44.

[0048] The driving mechanism is not limited to the structure in this embodiment, and an electric driving mechanism can also be used for the driving mechanism.

[0049] The three-way connecting pipe 4 further includes a limiting structure for limiting the rotating position of the baffle 43. In this embodiment, the limiting structure limits the rotating position of the manual valve rod 46. When the rotating position of the manual valve rod 46 is limited, the rotating position of the baffle 43 is limited.

[0050] Specifically, as Figure 5As shown, the limiting structure includes two limiting rods 47 fixedly arranged outside the main material discharging pipe 41, and the manual valve rod 46 is rotatably arranged between the two limiting rods 47. When the baffle 43 is in the first position, the manual valve rod 46 abuts against one of the limiting rods 47, and this limiting rod 47 limits the rotation of the manual valve rod 46 in the current direction, so that it cannot continue to rotate in the current direction and can only rotate in the opposite direction. When the baffle 43 is in the second position, the manual valve rod 46 abuts against the other limiting rod 47, and this limiting rod 47 limits the rotation of the manual valve rod 46 in the current direction, so that it cannot continue to rotate in the current direction and can only rotate in the opposite direction.

[0051] The three-way connecting pipe 4 further includes a locking structure for locking the baffle 43 in the first position and the second position. In this embodiment, when the manual valve rod 46 rotates to abut against the two limiting rods 47 respectively, the locking structure locks the positions of the limiting rods 47 at this time. After the position of the manual valve rod 46 is locked, the position of the baffle 43 is also locked.

[0052] As Figure 5 shown, the locking structure includes a locking plate 481 fixedly connected to the two limiting rods 47 at both ends and a locking pin 482 detachably connected to the locking plate 481. When the locking structure is in the locked state, the locking pin 482 is connected to the locking plate 481, and the manual valve rod 46 is limited between the limiting rod 47 and the locking pin 482, so that the manual valve rod 46 cannot rotate relative to the main material discharging pipe 41. After the connection between the locking pin 482 and the locking plate 481 is disengaged, the locking structure is in the unlocked state, and the manual valve rod 46 can rotate unidirectionally relative to the main material discharging pipe 41.

[0053] In this embodiment, there are two locking plates 481 arranged at intervals, and each locking plate 481 extends along the circumferential direction of the rotation of the manual valve rod 46, and the manual valve rod 46 is arranged in the interval area between the two locking plates 481. In this way, the locking plate 481 can also limit the position of the manual valve rod 46 and prevent the manual valve rod 46 from shaking.

[0054] The working principle of this PTA material discharging device is as follows:

[0055] When the measuring wheel 5 does not malfunction, operate the manual valve rod 46 to rotate the baffle 43 to the first position, lock the position of the manual valve rod 46 through the locking structure, and the control valve makes the gas passage 45 in a non-connected state.

[0056] After the PTA powder flows out of the silo 1, it sequentially flows through the rotary feeder 2 and the vibrating screen 3. After flowing out of the outlet of the vibrating screen 3, it enters the main material discharging pipe 41 from the main material discharging inlet 411, and flows out of the three-way connecting pipe 4 from the main material discharging outlet 412, and then flows into the slurry tank 6 after passing through the measuring wheel 5.

[0057] When a failure occurs in the measuring wheel 5, after unlocking the locking structure, operate the manual valve rod 46 to rotate the baffle 43 from the first position to the second position, lock the position of the manual valve rod 46 through the locking structure, and the control valve keeps the gas passage 45 in a communicating state.

[0058] After the PTA powder flows out of the silo 1, it sequentially flows through the rotary feeder 2 and the vibrating screen 3. After flowing out of the outlet of the vibrating screen 3, it enters the bypass feeding pipeline 42 from the main feeding inlet 411, flows out of the bypass outlet 421, passes through the three-way connecting pipe 4, and then flows into the slurry tank 6.

[0059] When the PTA powder is fed from the bypass feeding pipeline 42, the failure of the measuring wheel 5 can be detected and repaired. After the failure is eliminated, the manual valve rod 46 can be operated again to rotate the baffle 43 to the first position, and the powder is fed from the main feeding pipeline 41.

[0060] The above embodiments are only used to illustrate the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A PTA feeding device, characterized in that: It includes a bin, a rotary feeder, a vibrating screen, a three-way connecting pipe, a measuring wheel and a slurry tank arranged in sequence along the blanking path. The three-way connecting pipe includes a main blanking pipeline and a bypass blanking pipeline with one end fixedly connected and communicated with the main blanking pipeline. The upper end of the main blanking pipeline is provided with a main blanking inlet, the lower end of the main blanking pipeline is provided with a main blanking outlet, and the other end of the bypass blanking pipeline is provided with a bypass outlet; the main blanking inlet is connected and communicated with the vibrating screen, the main blanking outlet is connected and communicated with the measuring wheel, and the bypass outlet is connected and communicated with the slurry tank; The three-way connecting pipe further includes a baffle plate rotatably arranged in the main blanking pipeline. The baffle plate has a first position and a second position; when the baffle plate is in the first position, the baffle plate blocks between the main blanking inlet and the bypass outlet, the main blanking inlet and the bypass outlet are not communicated, and the main blanking inlet and the main blanking outlet are communicated; when the baffle plate is in the second position, the baffle plate blocks between the main blanking inlet and the main blanking outlet, the main blanking inlet and the main blanking outlet are not communicated, and the main blanking inlet and the bypass outlet are communicated; The three-way connecting pipe further includes a driving mechanism for driving the baffle plate to rotate relative to the main blanking pipeline, and the driving mechanism is connected or cooperated with the baffle plate.

2. The PTA blanking device according to claim 1, characterized in that: The bypass blanking pipeline includes a first pipeline. One end of the first pipeline is connected and communicated with the main blanking pipeline. The first pipeline is inclined downward relative to the main blanking pipeline from the connection with the main blanking pipeline. When the baffle plate is in the second position, the baffle plate is inclined downward in the main blanking pipeline from top to bottom, and the lower end of the baffle plate extends to the lowest position where the first pipeline intersects with the main blanking pipeline.

3. The PTA blanking device according to claim 2, wherein: The three-way connecting pipe further includes a gas passage with the lower end arranged on and communicated with the main blanking pipeline. The gas passage is inclined in the up and down direction. When the baffle plate is in the second position, the uppermost end of the baffle plate is not higher than the lowermost end of the gas passage.

4. The PTA blanking device according to claim 3, characterized in that: When the baffle plate is in the second position, the extending direction of the baffle plate is parallel to the extending direction of the first pipeline, or the included angle between the two is not greater than 5°; and / or, when the baffle plate is in the second position, the extending direction of the baffle plate is parallel to the extending direction of the gas passage, or the included angle between the two is not greater than 5°.

5. The PTA blanking device according to claim 3, characterized in that: When the baffle plate is in the second position, the spacing distance between the uppermost end of the baffle plate and the lowermost end of the gas passage is not greater than 5 mm.

6. The PTA blanking device according to claim 2, characterized in that: The main blanking pipeline extends in the vertical direction. When the baffle plate is in the first position, the baffle plate is located at the connection of the first pipeline and the main blanking pipeline, and the baffle plate extends in the vertical direction.

7. The PTA blanking device according to claim 2, characterized in that: The inclination angle of the first pipeline relative to the main blanking pipeline is 50 - 60°.

8. The PTA blanking device according to claim 1, characterized in that: One end of the baffle is fixedly provided with a rotating shaft, the rotating shaft is rotatably arranged on the main blanking pipeline, at least one end of the rotating shaft extends to the outside of the main blanking pipeline, and the driving mechanism includes a manual valve rod, and the manual valve rod is fixedly connected to the part of the rotating shaft extending to the outside of the main blanking pipeline.

9. The PTA blanking device according to claim 8, characterized in that: The tee connection pipe further includes a limiting structure for limiting the rotating position of the baffle, the limiting structure includes two limiting rods fixedly arranged outside the main blanking pipeline, and the manual valve rod is rotatably arranged between the two limiting rods; when the baffle is in the first position, the manual valve rod abuts against one of the limiting rods; when the baffle is in the second position, the manual valve rod abuts against the other limiting rod.

10. The PTA blanking device according to claim 9, wherein: The tee connection pipe further includes a locking structure for locking the position of the manual valve rod to lock the baffle in the first position and the second position, the locking structure includes a locking plate fixedly connected to the two limiting rods at both ends respectively and a locking pin detachably connected to the locking plate; When the locking structure is in the locked state, the locking pin is connected to the locking plate, and the manual valve rod is limited between the limiting rod and the locking pin; when the connection between the locking pin and the locking plate is disengaged, the locking structure is in the unlocked state.

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