Pressure balancing system of material delivery bin

Abstract

This utility model relates to the field of spinning production technology, specifically to a pressure balancing system for a material feeding chamber, comprising: a first feeding pipe and a second feeding pipe, wherein the first feeding pipe is provided with a first valve group and a second valve group, and the second feeding pipe is provided with a third valve group and a fourth valve group; a first feeding chamber and a second feeding chamber, wherein the first feeding chamber is connected to the first feeding pipe located between the first valve group and the second valve group. This application establishes a pressure balancing pipe connected to a pressure balancing air source between the first and second feeding chambers, and controls the air pressure within the first and second feeding chambers according to their respective states using corresponding valves, maintaining consistent pressure between the first and second feeding chambers and the discharge pipe, eliminating system pressure fluctuations caused by chamber switching, and ensuring a continuous and stable material supply for the spinning equipment.

Description

Technical Field

[0001] This utility model relates to the field of spinning production technology, and more specifically to a pressure balancing system for a material delivery bin. Background Technology

[0002] After polymerization, polymer chips or powders such as polyester / PET need to be conveyed to the next solid-phase thickening or spinning process via a pneumatic conveying system. The applicant's discharge system adopts a dual-discharge bin design with one in use and one in standby. Continuous discharge is achieved through automatic switching. When the material level in the in-use bin (such as bin A) reaches a high level, the control system will automatically switch to the standby bin (bin B) for operation, while bin A enters the loading and standby state. This design can theoretically ensure the continuity of production.

[0003] However, in actual operation, the sending chamber is filled with high-pressure nitrogen, and the pressure is balanced with the system's conveying pressure. After the backup chamber is filled, its internal pressure is at normal or low. When the system switches from the high-pressure chamber to the low-pressure chamber, the gas in the high-pressure system will instantly depressurize to the low-pressure chamber, causing the pressure of the entire conveying pipeline to drop sharply. This pressure shock will instantly destroy the stability of pneumatic conveying and cause a serious impact on the spinning process, which is highly dependent on pressure stability. Utility Model Content

[0004] To address the technical problems existing in the material dispatching bins of the prior art, this utility model proposes a technical solution: a pressure balancing system for a material dispatching bin, comprising:

[0005] A first feeding pipe and a second feeding pipe, wherein the first feeding pipe is provided with a first valve group and a second valve group, and the second feeding pipe is provided with a third valve group and a fourth valve group;

[0006] A first sending chamber and a second sending chamber, the first sending chamber being connected to a first feeding pipe located between a first valve group and a second valve group, and the second sending chamber being connected to a second feeding pipe located between a third valve group and a fourth valve group;

[0007] A discharge pipe is connected to the end of the first and second feeding pipes, and a first pressure sensor and a feeding fan are provided on the discharge pipe.

[0008] A pressure balancing pipeline is provided between the first sending chamber and the second sending chamber, and the pressure balancing pipeline is connected to a pressure balancing gas source. A first pressure balancing valve is provided between the first sending chamber and the pressure balancing gas source, and a second pressure balancing valve is provided between the second sending chamber and the pressure balancing gas source.

[0009] When the first valve group is opened, the first sending chamber is connected to the silo and is in the feeding state. When the second valve group is opened, the first sending chamber is connected to the discharge pipe and is in the feeding state. When the third valve group is opened, the second sending chamber is connected to the silo and is in the feeding state. When the fourth valve group is opened, the second sending chamber is connected to the discharge pipe and is in the feeding state.

[0010] The first and second sending chambers are configured to alternately feed and discharge materials. After the first and second sending chambers are discharged and before the first sending chambers are fed, they are replenished with air to a predetermined pressure through the pressure balancing pipe, so that there is no pressure fluctuation when the first and second sending chambers are alternately connected to the discharge pipe.

[0011] Preferably, the first sending chamber is equipped with a second pressure sensor for detecting the pressure inside the first sending chamber, and the second sending chamber is equipped with a third pressure sensor for detecting the pressure inside the second sending chamber.

[0012] Preferably, the first delivery bin is further provided with a first level gauge and a second level gauge. The first level gauge is used to detect whether the material in the first delivery bin has reached the lower limit of the material level, and the second level gauge is used to detect whether the material in the first delivery bin has reached the upper limit of the material level.

[0013] Preferably, the second sending bin is further provided with a third level gauge and a fourth level gauge. The third level gauge is used to detect whether the material in the second sending bin has reached the lower limit of the material level, and the fourth level gauge is used to detect whether the material in the second sending bin has reached the upper limit of the material level.

[0014] Preferably, the first pressure balancing valve and the second pressure balancing valve are solenoid valves.

[0015] Preferably, the first valve group, the second valve group, the third valve group and the fourth valve group each include a material blocking valve and a sealing valve, wherein the material blocking valve is disposed at the front end of the sealing valve along the feeding direction.

[0016] Preferably, in the second and fourth valve groups, the sealing valve closes after a preset time delay following the closure of the material blocking valve.

[0017] Preferably, the pressure balancing gas source includes a nitrogen gas source.

[0018] Preferably, the first pressure sensor is used to detect the pressure in the discharge pipe, and the feeding fan stops when the pressure in the discharge pipe is lower than a preset value.

[0019] Preferably, the first feeding pipe, the second feeding pipe, and the discharge pipe are all DN65 pipes.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] This application establishes a pressure balancing pipeline connected to a pressure balancing air source between the first and second sending chambers, and controls the air pressure in the first and second sending chambers according to their status using corresponding valves. This maintains consistent pressure between the first and second sending chambers and the discharge pipeline, eliminating system pressure fluctuations caused by material switching and ensuring a continuous and stable material supply for the spinning equipment. Attached Figure Description

[0022] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of the first sending chamber for feeding and the second sending chamber for emptying, as shown in this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of the first sending bin being full and the second sending bin being fed, as shown in this utility model.

[0025] Figure 3 This is a schematic diagram of the structure of the first sending chamber feeding material and the second sending chamber being full of material, as shown in this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the first sending chamber (empty) and the second sending chamber (feeding) shown in this utility model.

[0027] Figure 5 This is a schematic diagram of the structure of the first sending chamber for feeding and the second sending chamber for emptying, as shown in this utility model.

[0028] Figure 6 This is a schematic diagram of the structure of the first sending chamber being full and the second sending chamber being fed, as shown in this utility model. Detailed Implementation

[0029] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, this utility model proposes a technical solution: a pressure balancing system for a material delivery bin, comprising a first feeding pipe 10a, a second feeding pipe 10b, a first delivery bin 20a, a second delivery bin 20b, and a discharge pipe 30.

[0031] The first feeding pipe 10a is equipped with a first valve group and a second valve group, and the second feeding pipe 10b is equipped with a third valve group and a fourth valve group.

[0032] The first feeding chamber 20a is connected to the first feeding pipe 10a located between the first valve group and the second valve group, and the second feeding chamber 20b is connected to the second feeding pipe 10b located between the third valve group and the fourth valve group.

[0033] The discharge pipe 30 is connected to the end of the first feeding pipe 10a and the second feeding pipe 10b. The discharge pipe 30 is equipped with a first pressure sensor 31 and a feeding fan 32.

[0034] There are two feeding paths to the dispatch warehouse, as detailed below:

[0035] The first path is: upper section of the first feeding pipe 10a - first sending bin 20a - lower section of the first feeding pipe 10a - discharge pipe 30. The feeding fan 32 delivers the material in the discharge pipe 30 by means of carrier air feeding.

[0036] The second path is: upper section of the second feeding pipe 10b - second sending bin 20b - lower section of the second feeding pipe 10b - discharge pipe 30. The feeding fan 32 sends the material in the discharge pipe 30 out by means of carrier air feeding.

[0037] It should be understood that when the first sending chamber 20a or the second sending chamber 20b is in operation, the sending chamber is filled with high-pressure nitrogen, and the pressure is balanced with the system conveying pressure. When the two sending chambers are used as backup chambers, the internal pressure is normal pressure or a lower pressure after unloading. Therefore, when switching from a high-pressure chamber to a low-pressure chamber, the pressure of the conveying pipeline will drop sharply, which will disrupt the stability of the conveying.

[0038] A pressure balancing pipe is provided between the first sending chamber 20a and the second sending chamber 20b, and the pressure balancing pipe is connected to a pressure balancing gas source. A first pressure balancing valve 24a is provided between the first sending chamber 20a and the pressure balancing gas source, and a second pressure balancing valve 24b is provided between the second sending chamber 20b and the pressure balancing gas source.

[0039] Thus, before each delivery chamber changes from unloading to reloading, it is pre-inflated to maintain its chamber pressure consistent with the pressure of the delivery pipeline network.

[0040] In an optional embodiment, the first pressure balancing valve 24a and the second pressure balancing valve 24b are solenoid valves.

[0041] In this way, the state of the first pressure balancing valve 24a and the second pressure balancing valve 24b can be controlled in a timely manner through electronic control signals, so as to realize the actions of replenishing air and closing after the pressure reaches the target value.

[0042] In a preferred embodiment, the pressure balancing gas source includes a nitrogen gas source. Thus, the nitrogen used for pre-pressurization is an inert gas, which, while pressurizing the spare chamber, further reduces the oxygen content within the chamber. This provides crucial inertization protection for conveying flammable polymer powders, enhancing intrinsic safety.

[0043] Specifically, when the first valve group is opened, the first sending chamber 20a is connected to the silo and is in the feeding state; when the second valve group is opened, the first sending chamber 20a is connected to the discharge pipe 30 and is in the feeding state; when the third valve group is opened, the second sending chamber 20b is connected to the silo and is in the feeding state; and when the fourth valve group is opened, the second sending chamber 20b is connected to the discharge pipe 30 and is in the feeding state.

[0044] The first sending chamber 20a and the second sending chamber 20b are configured to alternate feeding and delivery. After delivery and before feeding, the first sending chamber 20a and the second sending chamber 20b are replenished with air to a predetermined pressure through a pressure balancing pipe, so that there is no pressure fluctuation when the first sending chamber 20a and the second sending chamber 20b are alternately connected to the discharge pipe 30.

[0045] Specifically, the first sending chamber 20a is equipped with a second pressure sensor 21a, which is used to detect the pressure inside the first sending chamber 20a, and the second sending chamber 20b is equipped with a third pressure sensor 21b, which is used to detect the pressure inside the second sending chamber 20b.

[0046] By detecting the pressure in the first sending chamber 20a and the second sending chamber 20b, inflation can be stopped once the air pressure in the first sending chamber 20a and the second sending chamber 20b reaches the target value during the inflation phase.

[0047] Furthermore, the first sending chamber 20a is also equipped with a first level gauge 23a and a second level gauge 22a. The first level gauge 23a is used to detect whether the material in the first sending chamber 20a has reached the lower limit of the material level, and the second level gauge 22a is used to detect whether the material in the first sending chamber 20a has reached the upper limit of the material level.

[0048] Furthermore, the second sending bin 20b is also equipped with a third level gauge 23b and a fourth level gauge 22b. The third level gauge 23b is used to detect whether the material in the second sending bin 20b has reached the lower limit of the material level, and the fourth level gauge 22b is used to detect whether the material in the second sending bin 20b has reached the upper limit of the material level.

[0049] Thus, by setting level gauges in the first sending chamber 20a and the second sending chamber 20b, the material level in the sending chamber can be effectively fed back. Once the material level is high, the sending chamber can enter the feeding state; once the material level is low, the sending chamber can enter the feeding state.

[0050] Combination Figure 1 As shown, the first valve group, the second valve group, the third valve group and the fourth valve group all include a material blocking valve and a sealing valve, wherein the material blocking valve is located at the front end of the sealing valve along the feeding direction.

[0051] Preferably, in the second and fourth valve groups, the sealing valve closes after a preset time delay following the closure of the material blocking valve.

[0052] Specifically, a first valve group is provided in the upper section of the first feeding pipe 10a, including a first material blocking valve 11a and a first sealing valve 12a, and a second valve group is provided in the lower section of the first feeding pipe 10a, including a second material blocking valve 13a and a second sealing valve 14a.

[0053] Specifically, a third valve group is provided in the upper section of the second feeding pipe 10b, including a third material blocking valve 11b and a third sealing valve 12b, and a fourth valve group is provided in the lower section of the second feeding pipe 10b, including a fourth material blocking valve 13b and a fourth sealing valve 14b.

[0054] In the above embodiment, the first pressure sensor 31 is used to detect the pressure in the discharge pipe 30. When the pressure in the discharge pipe 30 is lower than the preset value, the feeding fan 32 stops, which can save energy.

[0055] In the above embodiments, the first feeding pipe 10a, the second feeding pipe 10b, and the discharge pipe 30 are all DN65 pipes. By using pipes with smaller diameters and corresponding valve structures, maintenance costs can be reduced.

[0056] Combination Figure 1 and Figure 6 As shown, in a specific embodiment, such as Figure 1 As shown, the first feeding chamber 20a is feeding normally at this time. The first material blocking valve 11a and the first sealing valve 12a are open, while the second material blocking valve 13a and the second sealing valve 14a are closed.

[0057] Furthermore, when the signal of the second level gauge 22a of the first sending chamber 20a is lit, the first material blocking valve 11a closes, the third sealing valve 12b opens, and the second pressure balancing valve 24b opens to replenish air to the second sending chamber 20b and the pipeline above the second sending chamber 20b.

[0058] like Figure 2As shown, when the third pressure sensor 21b of the second sending chamber 20b detects that the pressure has reached the set value, the second pressure balance valve 24b closes, the third material blocking valve 11b opens, the second sending chamber 20b starts feeding, the first sealing valve 12a closes, the feeding fan 32 starts, and the second sealing valve 14a opens.

[0059] like Figure 3 As shown, when the first pressure sensor 31 detects that the pressure inside the discharge pipe 30 reaches the set value, the second material blocking valve 13a opens to start feeding.

[0060] Combination Figure 4 As shown, when the first level gauge 23a of the first sending chamber 20a detects a low level signal, the second blocking valve 13a closes after a 60-second delay, and the second sealing valve 14a closes after a 5-second delay.

[0061] Combination Figure 5 As shown, when the first pressure sensor 31 detects that the pressure in the discharge pipe 30 is lower than the set value, the feeding fan 32 stops, and one feeding conveying cycle ends.

[0062] Furthermore, after the fourth level gauge 22b of the second sending chamber 20b detects a high level signal, the third material blocking valve 11b closes, the first sealing valve 12a opens, and the first pressure balancing valve 24a opens.

[0063] Combination Figure 5 As shown, after the second pressure sensor 21a detects that the pressure has reached the set value, the first pressure balancing valve 24a closes, the first material blocking valve 11a opens, the first feeding chamber 20a starts feeding, the third sealing valve 12b closes, the feeding fan 32 starts, and the fourth sealing valve 14b opens.

[0064] Combination Figure 6 As shown, further, when the first pressure sensor 31 detects that the pressure inside the discharge pipe 30 reaches the set value, the fourth material blocking valve 13b opens to start feeding.

[0065] Combination Figure 6 As shown, when the third level gauge 23b detects a low level signal, the fourth material blocking valve 13b closes after a 60-second delay, and the fourth sealing valve 14b closes after a 5-second delay.

[0066] Combination Figure 6 As shown, when the first pressure sensor 31 detects that the pressure in the discharge pipe 30 is lower than the set value, the feeding fan 32 stops, and the secondary feeding conveying ends.

[0067] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A pressure equalization system for a material delivery bin, comprising: include: The first feeding pipe (10a) and the second feeding pipe (10b) are provided with a first valve group and a second valve group on the first feeding pipe (10a), and a third valve group and a fourth valve group on the second feeding pipe (10b). The first sending chamber (20a) and the second sending chamber (20b) are connected to a first feeding pipe (10a) located between a first valve group and a second valve group, and the second sending chamber (20b) is connected to a second feeding pipe (10b) located between a third valve group and a fourth valve group. A discharge pipe (30) is connected to the end of the first feeding pipe (10a) and the second feeding pipe (10b). The discharge pipe (30) is equipped with a first pressure sensor (31) and a feeding fan (32). A pressure balancing pipeline is provided between the first sending chamber (20a) and the second sending chamber (20b), the pressure balancing pipeline is connected to a pressure balancing gas source, a first pressure balancing valve (24a) is provided between the first sending chamber (20a) and the pressure balancing gas source, and a second pressure balancing valve (24b) is provided between the second sending chamber (20b) and the pressure balancing gas source. When the first valve group is opened, the first sending chamber (20a) is connected to the silo and is in the feeding state. When the second valve group is opened, the first sending chamber (20a) is connected to the discharge pipe (30) and is in the feeding state. When the third valve group is opened, the second sending chamber (20b) is connected to the silo and is in the feeding state. When the fourth valve group is opened, the second sending chamber (20b) is connected to the discharge pipe (30) and is in the feeding state. The first sending chamber (20a) and the second sending chamber (20b) are configured to alternately feed and deliver materials. After the first sending chamber (20a) and the second sending chamber (20b) are delivered materials but before the second sending chamber (20b) are fed materials, they are replenished with air to a predetermined pressure through the pressure balancing pipe so that there is no pressure fluctuation when the first sending chamber (20a) and the second sending chamber (20b) are alternately connected to the discharge pipe (30).

2. The pressure equalization system of a material delivery hopper of claim 1, wherein, The first sending chamber (20a) is provided with a second pressure sensor (21a) for detecting the pressure inside the first sending chamber (20a), and the second sending chamber (20b) is provided with a third pressure sensor (21b) for detecting the pressure inside the second sending chamber (20b).

3. The pressure equalization system of a material delivery hopper of claim 1, wherein, The first sending bin (20a) is also equipped with a first level gauge (23a) and a second level gauge (22a). The first level gauge (23a) is used to detect whether the material in the first sending bin (20a) has reached the lower limit of the material level, and the second level gauge (22a) is used to detect whether the material in the first sending bin (20a) has reached the upper limit of the material level.

4. The pressure equalization system of a material delivery hopper of claim 1, wherein, The second sending bin (20b) is also equipped with a third level gauge (23b) and a fourth level gauge (22b). The third level gauge (23b) is used to detect whether the material in the second sending bin (20b) has reached the lower limit of the material level, and the fourth level gauge (22b) is used to detect whether the material in the second sending bin (20b) has reached the upper limit of the material level.

5. The pressure equalization system of a material delivery hopper of claim 1, wherein, The first pressure balancing valve (24a) and the second pressure balancing valve (24b) are solenoid valves.

6. The pressure equalization system of a material delivery hopper of claim 1, wherein, The first valve group, the second valve group, the third valve group and the fourth valve group all include a material blocking valve and a sealing valve, wherein the material blocking valve is located at the front end of the sealing valve along the feeding direction.

7. The pressure equalization system of a material delivery hopper of claim 6, wherein, In the second and fourth valve groups, the sealing valve closes after a preset time delay following the closure of the material blocking valve.

8. The pressure balancing system for the material delivery bin according to claim 1, characterized in that, The pressure balancing gas source includes a nitrogen gas source.

9. The pressure equalization system of a material delivery hopper of claim 1, wherein, The first pressure sensor (31) is used to detect the pressure in the discharge pipe (30). When the pressure in the discharge pipe (30) is lower than the preset value, the feeding fan (32) stops.

10. The pressure equalization system of a material delivery hopper of claim 1, wherein, The first feeding pipe (10a), the second feeding pipe (10b), and the discharge pipe (30) are all DN65 pipes.

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