Water-saving polyester decolorization equipment, decolorization process and application in decolorization treatment

Abstract

The present invention relates to the field of polyester decolorization, and specifically relates to a water-saving polyester decolorization device, a decolorization process, and their applications in decolorization treatment. The water-saving polyester decolorization device includes a housing and a decolorization tank disposed in the housing for the reaction of polyester solution and decolorizing agent. First release mechanisms and second release mechanisms for injecting different decolorizing agents into the decolorization tank are respectively provided on both sides of the housing. The decolorization tank can move downward in the housing with the injection of polyester solution to drive the first release mechanisms and the second release mechanisms. Through the cooperation of a closed structure and an electric control valve, the present invention precisely controls the sequential injection of two decolorizing agents, ensuring that no reaction occurs between the two decolorizing agents until the polyester solution is completely injected, and then the two decolorizing agents also stop releasing simultaneously, ensuring the optimal ratio of the polyester solution to the decolorizing agent, thereby improving the decolorization effect of the polyester solution.

Description

Technical Field

[0001] The present invention relates to the field of polyester decolorization, and specifically relates to a water-saving polyester decolorization device, a decolorization process, and their applications in decolorization treatment. Background Art

[0002] Polyester, also known as PET, is widely used in industries and fields such as packaging, printing, sealing materials, adhesive products, and electronics. Since waste polyesters have different uses, they have diverse colors and contain adhesives and other plastics. By crushing waste polyesters and melting and depolymerizing them at a high temperature of 188°C to 210°C, and then adding DMSO and sodium hypochlorite as strong oxidants, the conjugated double bond structure of dye molecules is destroyed through an oxidation reaction to achieve the purpose of decolorization. However, the strong oxidizing property of sodium hypochlorite will react with DMSO, resulting in a decrease in the concentration of effective decolorizing components, weakening the oxidative decomposition effect of pigments on PET polyester, and the decolorization effect is not ideal.

[0003] Currently, a disclosed decolorization treatment device and method for recycling waste cotton with the authorization announcement number CN116024752B includes an outer cylinder with an open upper part. An inner cylinder with an open upper part is detachably installed inside the outer cylinder. A plurality of through holes are provided at the bottom and side walls of the inner cylinder. A plurality of groups of penetration flushing components are evenly distributed along the circumferential direction of the outer surface of the outer cylinder. The penetration flushing component includes a support block, which is installed vertically on the side of the outer cylinder. A first cylinder is installed vertically on the support block. A penetration nozzle is installed inside the first cylinder. A liquid supply component for supplying liquid to the penetration nozzle is installed on the support block. The first cylinder drives the penetration nozzle to move, so that the penetration nozzle has a working state and a retracted state. When the first cylinder drives the penetration nozzle to pass through the through hole and enter the inner cylinder, the penetration nozzle is in the working state, and the liquid supply component supplies decolorizing liquid to the penetration nozzle. A stirring component is installed at the lower part of the outer cylinder. A lifting component for driving the inner cylinder to separate from the outer cylinder is also installed on the upper part of the outer cylinder. A cover component for closing the open end of the inner cylinder is also installed on the support frame.

[0004] According to the above patent, by setting a penetration nozzle, during the decolorization process, the cylinder drives the penetration nozzle to repeatedly penetrate into the interior of the polyester depolymerization liquid, and decolorizing liquid is sprayed from the inside, accelerating the penetration speed of the decolorizing liquid into the polyester depolymerization liquid, thereby shortening the processing time of waste cotton decolorization. However, if the residue of one decolorizing agent reacts with another decolorizing agent, it will affect the decolorization effect of the other decolorizing agent, resulting in poor decolorization effect. Therefore, there is a need for a decolorization device that can easily isolate two decolorizing agents and add them sequentially to ensure the decolorization effect of the solution. Summary of the Invention

[0005] In view of the problems existing in the prior art, a water-saving polyester decolorization device is provided. Through the cooperation of a closed structure and an electric control valve, the present invention precisely controls the sequential injection of two decolorizing agents, ensuring that no reaction occurs between the two decolorizing agents. Until the polyester solution is completely injected, the two decolorizing agents also stop releasing simultaneously, ensuring the optimal ratio of the polyester solution to the decolorizing agent, thereby improving the decolorization effect of the polyester solution.

[0006] To solve the problems of the prior art, the present invention provides a water-saving polyester decolorization device, including a housing and a decolorization tank provided in the housing for the reaction of polyester solution and decolorizing agent. On both sides of the housing, a first release mechanism and a second release mechanism for introducing different decolorizing agents into the decolorization tank are respectively provided. The decolorization tank can move downward in the housing as the polyester solution is injected to drive the first release mechanism and the second release mechanism. When the decolorization tank automatically descends as the polyester solution is injected, the first release mechanism and the second release mechanism are in a sequential opening state, so that the two decolorizing agents are sequentially injected into the decolorization tank to react with the polyester solution.

[0007] Preferably, a first injection port and a second injection port connecting the first release mechanism and the second release mechanism are respectively provided on both sides of the decolorization tank. A closed structure is provided in the decolorization tank. When the closed structure is subjected to the injection pressure of the polyester solution, the first injection port is in an open state, and the second injection port is simultaneously in a closed state.

[0008] Preferably, both the first release mechanism and the second release mechanism have a fixed tube body and a movable tube body communicated with the corresponding injection port. The fixed tube body is coaxially inserted into the movable tube body, and the movable tube body can move along with the decolorization tank. When the decolorization tank moves downward, a receiving cavity communicated with the fixed tube body is formed in the movable tube body.

[0009] Preferably, an electric control valve cooperating with the closed structure is provided at the upper end of each fixed tube body. In the working state of the closed structure, the two electric control valves are simultaneously in an open state, while in the non-working state of the closed structure, the two electric control valves are simultaneously in a closed state, so that the decolorizing agent can be quantitatively added to the decolorization tank according to the polyester solution.

[0010] Preferably, the closed structure has a pressure cover plate with a size smaller than that of the decolorization tank and a first closed cover plate and a second closed cover plate provided on both sides thereof. A support shaft is provided in the decolorization tank, and a pressure sensor elastically connected to the pressure cover plate is provided on the support shaft. Each electric control valve is electrically connected to the pressure sensor.

[0011] Preferably, both the first closed cover plate and the second closed cover plate are closely attached to the inner wall of the decolorization tank, and the first closed cover plate and the second closed cover plate respectively have through ports capable of communicating the first injection port and the second injection port.

[0012] Preferably, a step is provided below the first injection port and the second injection port in the decolorization tank. A liquid level sensor for detecting the liquid level is provided on the step. When the first closing cover plate contacts the step, the through port on the first closing cover plate is in precise communication with the first injection port.

[0013] Preferably, a liquid injection funnel is provided on the housing opposite to the center of the pressure cover plate. A corrugated pipe for preventing the polyester solution from splashing out of the decolorization tank is provided between the liquid injection funnel and the decolorization tank.

[0014] The present invention also provides a water-saving polyester decolorization process, which is applied to a water-saving polyester decolorization device and includes the following steps:

[0015] S1. Pour the polyester solution into the decolorization tank and start the first release mechanism and the second release mechanism as the decolorization tank descends;

[0016] S2. The closing structure opens the first injection port, and the first release mechanism pours a decolorizing agent into the decolorization tank through the first injection port to mix with the polyester solution;

[0017] S3. The closing structure opens the second injection port, and the second release mechanism pours another decolorizing agent into the decolorization tank through the second injection port to mix with the polyester solution.

[0018] The present invention also provides the application of the water-saving polyester decolorization device in decolorization treatment, and adopts the water-saving polyester decolorization device.

[0019] The beneficial effects of the present application compared with the prior art are:

[0020] 1. The present invention controls the opening and closing of the first injection port and the second injection port through the closing structure, so that the two decolorizing agents are injected into the decolorization tank in sequence. When the polyester solution acts on the closing structure, the first injection port is opened and the second injection port is closed at the same time. At this time, the first decolorizing agent is injected into the decolorization tank through the first injection port. After the polyester solution is injected, the closing structure releases the closing state of the second injection port, so that the second injection port is opened and the first injection port is closed at the same time. At this time, the second decolorizing agent temporarily stored in the accommodation cavity flows into the decolorization tank. It realizes that the two decolorizing agents are injected into the decolorization tank in sequence according to the flow rate of the polyester solution. Compared with the mixed injection of the two decolorizing agents, it avoids unnecessary chemical reactions between the decolorizing agents, and at the same time ensures that each decolorizing agent plays its role under its most effective conditions, improving the decolorization effect;

[0021] 2. The present invention ensures the release of decolorizing agents in different proportions by controlling the opening degree of the electrically controlled valve or adjusting the initial distance between the movable pipe body and the decolorizing tank. As the polyester solution acts on the pressure cover plate, the pressure sensor senses the pressure of the pressure cover plate to open the electrically controlled valve, ensuring that the two decolorizing agents are appropriately injected into the corresponding accommodating cavities according to the amount of the polyester solution. When the first closed cover plate opens the first injection port, the second closed cover plate simultaneously closes the second injection port, allowing the first decolorizing agent to flow into the decolorizing tank first. And when the second closed cover plate opens the second injection port, the first closed cover plate closes the first injection port, enabling the second decolorizing agent to flow into the decolorizing tank after the first decolorizing agent is completely injected, ensuring the equal release of the two decolorizing agents;

[0022] 3. Through the guidance of the polyester solution by the liquid injection funnel, the present invention ensures that during the injection process of the polyester solution, the polyester solution first acts on the pressure cover plate, thereby controlling the opening and closing of the first injection port, the second injection port, and the electrically controlled valve. At the same time, the corrugated pipe can stretch and contract adaptively when the decolorizing tank moves, effectively preventing the polyester solution from splashing out of the decolorizing tank, ensuring the flow rate of the polyester solution, avoiding the disproportion of the ratio between the polyester solution and the decolorizing agent, and improving the decolorizing effect of the polyester solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the water-saving polyester decolorizing equipment of the present invention;

[0024] Figure 2 is a plan sectional view of the water-saving polyester decolorizing equipment of the present invention;

[0025] Figure 3 is a three-dimensional structural sectional view of the water-saving polyester decolorizing equipment of the present invention;

[0026] Figure 4 is a partial three-dimensional structural schematic diagram of the decolorizing tank, the first release mechanism, and the second release mechanism of the water-saving polyester decolorizing equipment of the present invention;

[0027] Figure 5 is of the present invention Figure 2 three-dimensional structural sectional view at A-A;

[0028] Figure 6 is a state schematic diagram of the first release mechanism and the second release mechanism of the water-saving polyester decolorizing equipment of the present invention in a non-working state;

[0029] Figure 7 is a state schematic diagram of the first release mechanism and the second release mechanism of the water-saving polyester decolorizing equipment of the present invention in a working state;

[0030] Figure 8 is a three-dimensional structural sectional view of the decolorizing tank and the closing structure of the water-saving polyester decolorizing equipment of the present invention;

[0031] Figure 9 is of the present invention Figure 8 Schematic enlarged view of part B;

[0032] Figure 10 is of the present invention Figure 2 Schematic enlarged view of part C;

[0033] In the figure, the reference numerals are: 1, housing; 11, liquid injection funnel; 12, corrugated pipe; 2, decolorization tank; 21, first injection port; 22, second injection port; 23, support shaft; 231, stirrer; 24, step; 241, liquid level sensor; 25, liquid outlet; 26, guide rod; 3, first release mechanism; 31, fixed pipe body; 311, electric control valve; 32, movable pipe body; 4, second release mechanism; 5, sealing structure; 51, pressure cover plate; 511, pressure sensor; 52, first sealing cover plate; 521, through port; 53, second sealing cover plate; 6, self - lowering mechanism; 61, hydraulic chamber; 611, inner cavity; 6111, first piston; 612, outer cavity; 6121, second piston; 6122, counterweight; 62, bottom support; 621, compression spring; 63, sliding connecting member; 631, guide rail; 632, guide wheel; 633, accommodating cavity. Detailed implementation manners

[0034] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0035] Refer to Figures 1-7 and Figure 10 As shown, the water - saving polyester decolorization device includes a housing 1 and a decolorization tank 2 provided in the housing 1 for the reaction of polyester solution and decolorizing agent. The two sides of the housing 1 are respectively provided with a first release mechanism 3 and a second release mechanism 4 for injecting different decolorizing agents into the decolorization tank 2. The decolorization tank 2 can move downward in the housing 1 as the polyester solution is injected to drive the first release mechanism 3 and the second release mechanism 4. When the decolorization tank 2 automatically descends as the polyester solution is injected, the first release mechanism 3 and the second release mechanism 4 are in an open state in sequence, so that the two decolorizing agents are injected into the decolorization tank 2 in sequence to react with the polyester solution.

[0036] The decolorization tank 2 has a liquid outlet 25.

[0037] The decolorization tank 2 has a heat - insulating layer, which is not shown in the figure. Through the heat - insulating treatment of the heat - insulating layer, the situation that the depolymerized polyester solution is prone to solidify and not flow when it is lower than about 100 °C is prevented.

[0038] A self - lowering mechanism 6 that can adapt to the gravity of the decolorization tank 2 and has a reset effect is provided in the housing 1.

[0039] The self-lowering mechanism 6 includes a hydraulic chamber 61, and the hydraulic chamber 61 has an inner cavity 611 and an outer cavity 612 that communicate with each other and are filled with hydraulic oil. The inner cavity 611 and the outer cavity 612 are connected through a connecting pipe. A first piston 6111 and a second piston 6121 are respectively arranged in the inner cavity 611 and the outer cavity 612.

[0040] A guide rod 26 that extends downward and is fixed to the first piston 6111 is fixedly arranged on the decolorizing tank 2.

[0041] A counterweight 6122 capable of maintaining the same height as the first piston 6111 when no polyester solution is injected into the decolorizing tank 2 is arranged on the second piston 6121.

[0042] The self-lowering mechanism 6 further includes a bottom support 62 for supporting the decolorizing tank 2 and sliding connectors 63 arranged on both sides of the bottom support 62. A compression spring 621 for achieving a reset effect is arranged between the bottom support 62 and the hydraulic chamber 61.

[0043] The sliding connector 63 has a guide rail 631 extending in the vertical direction and a guide wheel 632 arranged on the bottom support 62 that is in sliding contact with the guide rail 631.

[0044] When the decolorizing tank 2 is unloaded, the first piston 6111 and the second piston 6121 with the counterweight 6122 are in a balanced state, and their heights are the same. As the polyester solution is continuously injected, the total weight of the decolorizing tank 2 gradually increases, and the vertical pressure applied to the guide rod 26 forces the first piston 6111 to move downward, and the hydraulic oil flows from the inner cavity 611 to the outer cavity 612 through the connecting pipe. This enables the flow rate of the hydraulic oil to form a dynamic balance with the solution injection speed, ensuring the smooth descent of the decolorizing tank 2.

[0045] When the decolorizing tank 2 descends, the first release mechanism 3 and the second release mechanism 4 are triggered in sequence. At this time, the descending stroke of the decolorizing tank 2 is precisely guided by the guide wheel 632 of the sliding connector 63 and the guide rail 631, and the compression spring 621 starts to store energy. After the first release mechanism 3 is opened, the first decolorizing agent is quantitatively injected into the decolorizing tank 2 to react with the polyester solution, dissolving and dispersing the pigments in the polyester solution.

[0046] After the first decolorizing agent is injected, the second release mechanism 4 is then opened. At this time, the second decolorizing agent is quantitatively injected into the decolorizing tank 2 to react with the polyester solution, dissolving and dispersing the remaining pigment structures in the polyester solution.

[0047] When the decolorization reaction of the polyester solution is completed, the liquid outlet 25 is opened, and the decolorized polyester solution begins to be discharged. As the weight of the decolorization tank 2 decreases, the elastic potential energy stored in the compression spring 621 is gradually released, pushing the bottom support 62 to drive the decolorization tank 2 to rise. At this time, the hydraulic oil in the outer cavity 612 flows back to the inner cavity 611 under the action of the gravity of the counterweight 6122, and the first piston 6111 rises synchronously with the guide rod 26 until it is fully reset.

[0048] See Figures 2-7 As shown, a first injection port 21 connecting the first release mechanism 3 and a second injection port 22 connecting the second release mechanism 4 are respectively provided on both sides of the decolorization tank 2. A sealing structure 5 is provided in the decolorization tank 2. When the sealing structure 5 is subjected to the injection pressure of the polyester solution, the first injection port 21 is in an open state, and the second injection port 22 is in a closed state at the same time.

[0049] When the polyester solution is injected into the decolorization tank 2, as the amount of the solution increases, the weight of the decolorization tank 2 increases and it automatically descends. During the injection process of the polyester solution, the pressure exerted by the polyester solution acts on the sealing structure 5 in the decolorization tank 2, causing the first injection port 21 to automatically open when the sealing mechanism is subjected to the injection pressure, allowing the first decolorizing agent to enter the decolorization tank 2 through the first release mechanism 3 and start reacting with the polyester solution. At this time, the second injection port 22 remains closed, preventing the second decolorizing agent from entering.

[0050] When the polyester solution is completely injected into the decolorization tank 2, the sealing structure 5 is in an unpressurized state, and the decolorization tank 2 also stops descending. At this time, the first injection port 21 automatically closes, and the second injection port 22 automatically opens when the sealing mechanism is not subjected to the injection pressure, allowing the second decolorizing agent to enter the decolorization tank 2 through the second release mechanism 4 and start reacting with the polyester solution.

[0051] This ensures that the two decolorizing agents react with the polyester solution in sequence, realizing an orderly decolorization process and guaranteeing the decolorization effect of the polyester solution.

[0052] See Figures 2-7 As shown, both the first release mechanism 3 and the second release mechanism 4 have a fixed tube body 31 and a movable tube body 32 communicating with the corresponding injection port. The fixed tube body 31 is coaxially inserted into the movable tube body 32, and the movable tube body 32 can move with the decolorization tank 2. When the decolorization tank 2 moves downward, a receiving cavity 633 communicating with the fixed tube body 31 is formed in the movable tube body 32.

[0053] When the decolorization tank 2 increases in weight due to the injection of the polyester solution and begins to move downward, the movable tube body 32 follows the decolorization tank 2 and descends. At the same time, the receiving cavity 633 is formed. This allows the decolorizing agent to enter the decolorization tank 2 through the receiving cavity 633 formed in the movable tube body 32.

[0054] When the decolorizing agent is released simultaneously from the two fixed pipe bodies 31, that is, the fixed pipe bodies 31 convey the decolorizing agent into them through a liquid pump. Since the first injection port 21 is in the open state and the second injection port 22 is in the closed state. Therefore, the first decolorizing agent continuously flows into the decolorizing tank 2 through the first injection port 21 during the descent of the decolorizing tank 2, while the second decolorizing agent is temporarily stored in the formed accommodating cavity 633.

[0055] Until the injection of the polyester solution is completed, the two fixed pipe bodies 31 simultaneously close the release of the decolorizing agent. At this time, the first decolorizing agent has been injected with an appropriate amount according to the polyester solution. Since the sealing structure 5 is not pressurized, the first injection port 21 is in the closed state and the second injection port 22 is in the open state. This allows the second decolorizing agent equal in amount to the first decolorizing agent temporarily stored in the accommodating cavity 633 to flow into the decolorizing tank 2, completing the decolorization of the polyester solution.

[0056] See Figures 2-7 As shown, an electrically controlled valve 311 cooperating with the sealing structure 5 is provided at the upper end of each fixed pipe body 31. In the working state of the sealing structure 5, the two electrically controlled valves 311 are simultaneously in the open state, and in the non - working state of the sealing structure 5, the two electrically controlled valves 311 are simultaneously in the closed state, enabling the decolorizing agent to be quantitatively added to the decolorizing tank 2 according to the polyester solution.

[0057] By precisely adjusting the opening degree of the electrically controlled valve 311, different ratios of decolorizing agent release can be achieved to facilitate the control of the amount of the decolorizing agent.

[0058] It is also possible to precisely adjust the initial distance between the movable pipe body 32 and the decolorizing tank 2, and then adjust the opening degree between the movable pipe body 32 and the corresponding injection port, so as to achieve different ratios of decolorizing agent release to facilitate the control of the amount of the decolorizing agent. The specific structure capable of adjusting the opening degrees of the first injection port 21 and the second injection port 22 is not shown in the figure.

[0059] When the sealing structure 5 is under the solution injection pressure, the two electrically controlled valves 311 are simultaneously opened, and the two decolorizing agents are respectively injected into the corresponding accommodating cavities 633. The first decolorizing agent directly enters the decolorizing tank 2 through the opened first injection port 21, while the second injection port 22 remains closed to prevent the second decolorizing agent from entering in advance.

[0060] During the continuous descent of the decolorizing tank 2, the first decolorizing agent continuously flows into the decolorizing tank 2. As the injection of the polyester solution is completed, the sealing structure 5 is no longer pressurized, and the two electrically controlled valves 311 are simultaneously switched to the closed state. At this time, the first injection port 21 is closed and the second injection port 22 is opened. The second decolorizing agent temporarily stored in the accommodating cavity 633 then enters the decolorizing tank 2 through the second injection port 22 to continue dissolving and dispersing the remaining pigment structure.

[0061] It ensures that both decolorizing agents are accurately added to the decolorizing tank 2 according to the amount of polyester solution injected, ensuring the efficiency and accuracy of the entire decolorizing process.

[0062] See Figures 2-9 As shown, the closed structure 5 has a pressure cover plate 51 with a size smaller than that of the decolorizing tank 2, and a first closed cover plate 52 and a second closed cover plate 53 arranged on both sides thereof. A support shaft 23 is provided in the decolorizing tank 2, and a pressure sensor 511 elastically connected to the pressure cover plate 51 is provided on the support shaft 23. Each electric control valve 311 is electrically connected to the pressure sensor 511.

[0063] A stirrer 231 for mixing the decolorizing agent and the polyester solution is provided on the support shaft 23, and the drive source of the stirrer 231 is not shown in the figure.

[0064] When starting to inject the polyester solution into the decolorizing tank 2, the polyester solution exerts pressure on the pressure cover plate 51. The pressure is transmitted to the pressure sensor 511. The pressure sensor 511 detects the pressure change and transmits the signal to the control system of the electric control valve 311, and at the same time opens the two electric control valves 311. At this time, the first closed cover plate 52 opens the first injection port 21 to allow the first decolorizing agent to enter the decolorizing tank 2. And the second closed cover plate 53 closes the second injection port 22 at the same time to prevent the second decolorizing agent from entering.

[0065] As the polyester solution continues to be injected, since the size of the pressure cover plate 51 is smaller than that of the decolorizing tank 2, the polyester solution flows into the decolorizing tank 2 through the gap between the two. When the injection of the polyester solution is completed, the pressure cover plate 51 is no longer under pressure, and the pressure sensor 511 sends a signal to the control system of the electric control valve 311, causing the fixed pipe body 31 to stop injecting the decolorizing agent. At this time, the first closed cover plate 52 closes the first injection port 21 to stop the inflow of the first decolorizing agent, and the second closed cover plate 53 opens the second injection port 22 to allow the second decolorizing agent to enter the decolorizing tank 2. Ensure that the two decolorizing agents are added to the decolorizing tank 2 according to the requirements in a quantitative and orderly manner.

[0066] When the decolorizing agent enters the decolorizing tank 2, the stirrer 231 starts to work, fully mixing the decolorizing agent and the polyester solution, ensuring uniform reaction, improving the decolorizing effect, and preventing the two decolorizing agents from reacting.

[0067] See Figures 5-8 As shown, both the first closed cover plate 52 and the second closed cover plate 53 are closely attached to the inner wall of the decolorizing tank 2, and the first closed cover plate 52 and the second closed cover plate 53 respectively have through ports 521 capable of communicating with the first injection port 21 and the second injection port 22.

[0068] When the first closing cover plate 52 closes the first injection port 21 or the second closing cover plate 53 closes the second injection port 22, the first closing cover plate 52 and the second closing cover plate are in close contact with the inner wall of the decolorization tank 2, ensuring that the decolorizing agent does not accidentally enter the decolorization tank 2 and ensuring the accuracy of the injection volume.

[0069] When the first closing cover plate 52 opens the first injection port 21 or the second closing cover plate 53 opens the second injection port 22, the precise alignment of the through port 521 with the injection port realizes the precise control of injecting the decolorizing agent into the decolorization tank 2.

[0070] See Figures 6-8 As shown, a step 24 is provided below the first injection port 21 and the second injection port 22 in the decolorization tank 2. A liquid level sensor 241 for detecting the liquid level is provided on the step 24. When the first closing cover plate 52 contacts the step 24, the through port 521 on the first closing cover plate 52 is in a precisely connected state with the first injection port 21.

[0071] When the first closing cover plate 52 contacts the step 24, the through port 521 on the first closing cover plate 52 is precisely connected with the first injection port 21, ensuring that the first decolorizing agent can accurately enter the decolorization tank 2 and avoiding the situation of small amounts of injection. At this time, the second closing cover plate 53 tightly seals the second injection port 22 to prevent the second decolorizing agent from reacting with the first decolorizing agent.

[0072] During the process of injecting the polyester solution and the decolorizing agent into the decolorization tank 2, the liquid level sensor 241 monitors the liquid level change in real time to avoid the liquid level exceeding the first injection port 21 and the second injection port 22 and affecting the injection of the decolorizing agent.

[0073] See Figure 6 and Figure 7 As shown, a liquid injection funnel 11 is provided on the housing 1 opposite to the center of the pressure cover plate 51. A corrugated pipe 12 for preventing the polyester solution from splashing out of the decolorization tank 2 is provided between the liquid injection funnel 11 and the decolorization tank 2.

[0074] The maximum extension length of the corrugated pipe 12 is greater than the maximum displacement of the decolorization tank 2.

[0075] Since the maximum extension length of the corrugated pipe 12 is greater than the maximum displacement of the decolorization tank 2, and the decolorization tank 2 descends and ascends in a slow running state, the wear rate of the corrugated pipe 12 is relatively low and can meet the requirements of continuous operation.

[0076] During the process of injecting the polyester solution, the polyester solution is guided by the liquid injection funnel 11 to act on the pressure cover plate 51 first, causing the pressure cover plate 51 to drive the opening and closing of the first injection port 21 and the second injection port 22 and the opening of the electric control valve 311. During this process, through the closure of the corrugated pipe 12, the situation of the polyester solution splashing out of the decolorization tank 2 on the pressure cover plate 51 is prevented.

[0077] During the movement of the decolorization tank 2, the corrugated pipe 12 can stretch and contract adaptively, effectively preventing the polyester solution from splashing out of the decolorization tank 2 during continuous injection.

[0078] A water-saving polyester decolorization process is applied to a water-saving polyester decolorization device, including the following steps:

[0079] S1. Pour the polyester solution into the decolorization tank 2 and start the first release mechanism 3 and the second release mechanism 4 as the decolorization tank 2 descends;

[0080] S2. The closing structure 5 opens the first injection port 21, and the first release mechanism 3 pours a decolorizing agent into the decolorization tank 2 through the first injection port 21 to mix with the polyester solution;

[0081] S3. The closing structure 5 opens the second injection port 22, and the second release mechanism 4 pours another decolorizing agent into the decolorization tank 2 through the second injection port 22 to mix with the polyester solution.

[0082] The application of the water-saving polyester decolorization device in decolorization treatment adopts the above-mentioned water-saving polyester decolorization device.

[0083] Through the cooperation of the closing structure 5 and the electric control valve 311, the present invention precisely controls the sequential injection of the two decolorizing agents to ensure that no reaction occurs between the two decolorizing agents, thereby improving the decolorization effect of the polyester solution.

[0084] During the injection of the polyester solution, the liquid injection funnel 11 guides the polyester solution to act on the pressure cover plate 51, controls the opening and closing of the first injection port 21 and the second injection port 22, realizes the priority injection of the first decolorizing agent, and then switches to the injection of the second decolorizing agent. Until the polyester solution is completely injected, the two decolorizing agents also stop releasing simultaneously, ensuring the best ratio of the polyester solution to the decolorizing agent.

[0085] The above embodiments only represent one or several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. Water-saving polyester decolorization equipment, including a housing (1) and a decolorization tank (2) arranged in the housing (1) for the reaction of polyester solution and decolorizing agent; it is characterized in that, On both sides of the housing (1), a first release mechanism (3) and a second release mechanism (4) for injecting different decolorizing agents into the decolorization tank (2) are respectively provided. The decolorization tank (2) can move downward in the housing (1) with the injection of the polyester solution to drive the first release mechanism (3) and the second release mechanism (4). When the decolorization tank (2) automatically descends with the injection of the polyester solution, the first release mechanism (3) and the second release mechanism (4) are in an open state in sequence, so that the two decolorizing agents are injected into the decolorization tank (2) in sequence to react with the polyester solution. On both sides of the decolorization tank (2), a first injection port (21) and a second injection port (22) connecting the first release mechanism (3) and the second release mechanism (4) are respectively provided. A sealing structure (5) is provided in the decolorization tank (2). When the sealing structure (5) is subjected to the injection pressure of the polyester solution, the first injection port (21) is in an open state, and the second injection port (22) is in a closed state at the same time. Both the first release mechanism (3) and the second release mechanism (4) have a fixed tube body (31) and a movable tube body (32) communicated with the corresponding injection port. The fixed tube body (31) is coaxially inserted into the movable tube body (32). The movable tube body (32) can move along with the decolorization tank (2). When the decolorization tank (2) moves downward, a receiving cavity (633) communicated with the fixed tube body (31) is formed in the movable tube body (32). An electric control valve (311) matched with the sealing structure (5) is provided at the upper end of each fixed tube body (31). In the working state of the sealing structure (5), the two electric control valves (311) are in an open state at the same time, and in the non-working state of the sealing structure (5), the two electric control valves (311) are in a closed state at the same time, so that the decolorizing agent can be quantitatively added into the decolorization tank (2) according to the polyester solution. The sealing structure (5) has a pressure cover plate (51) with a size smaller than that of the decolorization tank (2) and a first sealing cover plate (52) and a second sealing cover plate (53) arranged on both sides thereof. A support shaft (23) is provided in the decolorization tank (2). A pressure sensor (511) elastically connected to the pressure cover plate (51) is provided on the support shaft (23). Each electric control valve (311) is electrically connected to the pressure sensor (511). The first sealing cover plate (52) and the second sealing cover plate (53) are both closely attached to the inner wall of the decolorization tank (2). The first sealing cover plate (52) and the second sealing cover plate (53) respectively have through openings (521) capable of communicating the first injection port (21) and the second injection port (22).

2. The water-saving polyester decolorization device according to claim 1, characterized in that, A step (24) is provided below the first injection port (21) and the second injection port (22) in the decolorization tank (2). A liquid level sensor (241) for detecting the liquid level is provided on the step (24). When the first sealing cover plate (52) contacts the step (24), the through opening (521) on the first sealing cover plate (52) is in a precisely communicated state with the first injection port (21).

3. The water-saving polyester decolorization device according to claim 1, wherein A liquid injection funnel (11) facing the center of the pressure cover plate (51) is provided on the housing (1), and a corrugated pipe (12) for preventing the polyester solution from splashing out of the decolorization tank (2) is provided between the liquid injection funnel (11) and the decolorization tank (2).

4. Water-saving polyester decolorization process, applied to the water-saving polyester decolorization equipment described in any one of claims 1-3, characterized in that, It includes the following steps: S1. Pour the polyester solution into the decolorization tank (2) and start the first release mechanism (3) and the second release mechanism (4) as the decolorization tank (2) descends; S2. The closing structure (5) opens the first injection port (21), and the first release mechanism (3) pours a decolorizing agent into the decolorization tank (2) through the first injection port (21) to mix with the polyester solution; S3. The closing structure (5) opens the second injection port (22), and the second release mechanism (4) pours another decolorizing agent into the decolorization tank (2) through the second injection port (22) to mix with the polyester solution.

5. Application of the water-saving polyester decolorization equipment in decolorization treatment, characterized in that, The water-saving polyester decolorization equipment according to any one of claims 1-3 is adopted.

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