Water-saving type polyester decolorizing equipment, decolorizing process and application of water-saving type polyester decolorizing process in decolorizing treatment

Abstract

The invention relates to the field of polyester decoloring, in particular to water-saving polyester decoloring equipment, a decoloring process and application of the water-saving polyester decoloring equipment and the decoloring process in decoloring treatment. The water-saving type polyester matter decolorizing equipment comprises a shell and a decolorizing tank which is arranged in the shell and used for reaction of a polyester solution and a decolorizing agent, and a first releasing mechanism and a second releasing mechanism which are used for feeding different decolorizing agents into the decolorizing tank are arranged on the two sides of the shell respectively. The decolorizing tank can move downwards in the shell along with injection of a polyester solution so as to drive the first release mechanism and the second release mechanism. Through cooperation of a closed structure and an electric control valve, sequential injection of two decolorizing agents is accurately controlled, it is ensured that the two decolorizing agents do not react, release of the two decolorizing agents is stopped at the same time until a polyester solution is injected, the optimal proportion of the polyester solution to the decolorizing agents is ensured, and therefore the decolorizing effect of the polyester solution is improved.

Description

Technical Field

[0001] The invention relates to the field of polyester decolorization, and in particular to water-saving polyester decolorization equipment, a decolorization process and an application in decolorization treatment. Background Art

[0002] Polyester, also known as PET, is widely used in packaging, printing, sealing materials, viscose products, electronics and other industries and fields. Due to different uses, the waste polyester has various colors and contains adhesives and other plastics. The waste polyester is crushed and dissolved and depolymerized at a high temperature of 188℃~210℃, and then DMSO and sodium hypochlorite are added as strong oxidants to destroy the conjugated double bond structure of the dye molecule through 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 decolorization components, so that the oxidative decomposition of the pigment on PET polyester is weakened, and the decolorization effect is not ideal.

[0003] The currently disclosed authorization announcement number is CN116024752B, which is a decolorization treatment device and decolorization method for waste cotton regeneration, comprising an outer cylinder with an open top, an inner cylinder with an open top detachably installed in the outer cylinder, a plurality of through holes are opened on the bottom and side walls of the inner cylinder, a plurality of groups of penetration flushing components are evenly distributed on the outer surface of the outer cylinder along its circumference, and the penetration flushing components include a support block, the support block is installed on the side of the outer cylinder in the vertical direction, a first cylinder is installed on the support block in the vertical direction, and a A penetrating nozzle, a liquid supply component for supplying liquid to the penetrating nozzle is installed on the support block, the first cylinder drives the penetrating nozzle to move, so that the penetrating nozzle has a working state and a retracted state, when the first cylinder drives the penetrating nozzle to pass through the through hole into the inner cylinder, the penetrating nozzle is in the working state, and the liquid supply component supplies decolorizing liquid to the penetrating nozzle, a stirring component is installed at the lower part of the outer cylinder body, and a support frame is also installed at the upper part of the outer cylinder body, an upward moving component for driving the inner cylinder to separate from the outer cylinder body is installed on the support frame, and a sealing component for closing the opening of the inner cylinder is also installed on the support frame.

[0004] According to the above patent, the above patent sets a penetrating nozzle, which is driven by a cylinder to repeatedly penetrate into the interior of the polyester depolymerization liquid during the decolorization process, and sprays the decolorization liquid from the interior, thereby accelerating the penetration speed of the decolorization liquid into the polyester depolymerization liquid, thereby shortening the decolorization treatment time of the waste cotton. 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 is easy to isolate two decolorizing agents and add them in sequence 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. The invention uses a closed structure and an electrically controlled valve to accurately control the injection of two decolorizers in sequence, ensuring that no reaction occurs between the two decolorizers. After the polyester solution is injected, the two decolorizers stop releasing at the same time, ensuring the optimal ratio of the polyester solution to the decolorizer, thereby improving the decolorization effect of the polyester solution.

[0006] In order to solve the problems of the prior art, the present invention provides a water-saving polyester decolorization device, comprising a shell and a decolorization tank arranged in the shell for a polyester solution to react with a decolorizer, wherein a first release mechanism and a second release mechanism are respectively provided on both sides of the shell for different decolorizers to be put into the decolorization tank, and the decolorization tank can move downward in the shell as the polyester solution is injected to drive the first release mechanism and the second release mechanism, and when the decolorization tank automatically descends as the polyester solution is injected, the first release mechanism and the second release mechanism are in a sequentially opened state, so that the two decolorizers are sequentially injected into the decolorization tank to react with the polyester solution.

[0007] Preferably, a first injection port and a second injection port connected to a first release mechanism and a second release mechanism are respectively provided on both sides of the decolorization tank, and 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 in a closed state at the same time.

[0008] Preferably, the first release mechanism and the second release mechanism both have a fixed tube body and a movable tube body connected to the corresponding injection port, the fixed tube body is coaxially inserted in the movable tube body, the movable tube body can move with the decolorization tank, and when the decolorization tank moves downward, a accommodating cavity connected to the fixed tube body is formed in the movable tube body.

[0009] Preferably, the upper end of each fixed tube body is provided with an electrically controlled valve cooperating with the closed structure. When the closed structure is in a working state, the two electrically controlled valves are in an open state at the same time, and when the closed structure is in a non-working state, the two electrically controlled valves are in a closed state at the same time, so that the decolorizer can be quantitatively added to the decolorization tank according to the polyester solution.

[0010] Preferably, the closed structure has a pressure cover plate that is smaller than the decolorization tank and a first closed cover plate and a second closed cover plate arranged 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 electrically controlled valve is electrically connected to the pressure sensor.

[0011] Preferably, the first closing cover plate and the second closing cover plate are both tightly fitted to the inner wall of the decolorizing tank, and the first closing cover plate and the second closing cover plate respectively have a through opening capable of connecting 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 decolorizing tank, and 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 a precisely connected state with the first injection port.

[0013] Preferably, a liquid injection funnel facing the center of the pressure cover plate is provided on the shell, and a bellows is provided between the liquid injection funnel and the decolorization tank to prevent the polyester solution from splashing out of 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 comprises the following steps: S1, pouring the polyester solution into the decolorization tank and starting the first release mechanism and the second release mechanism as the decolorization tank descends; S2, the closing structure opens the first injection port, and the first release mechanism pours a decolorizing agent into the decolorizing tank through the first injection port to mix with the polyester solution; S3, the closing structure opens the second injection port, and the second release mechanism pours another decolorizing agent into the decolorizing tank through the second injection port to mix with the polyester solution.

[0015] The present invention also provides the application of water-saving polyester decolorization equipment in decolorization treatment, and adopts the water-saving polyester decolorization equipment.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention controls the opening and closing of the first nozzle and the second nozzle through a closed structure, so that the two decolorants are injected into the decolorization tank in sequence. When the polyester solution acts on the closed structure, the first nozzle is opened and the second nozzle is closed at the same time. At this time, the first decolorant is injected into the decolorization tank through the first nozzle. After the polyester solution is injected, the closed structure releases the closed state of the second nozzle, so that the second nozzle is opened and the first nozzle is closed at the same time. At this time, the second decolorant temporarily stored in the accommodating cavity flows into the decolorization tank. The two decolorants 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 decolorants, unnecessary chemical reactions between the decolorants are avoided, while ensuring that each decolorant works under its most effective conditions, thereby improving the decolorization effect; 2. The present invention ensures the release of decolorizers in different proportions by controlling the opening of the electric control valve or adjusting the initial distance between the movable tube body and the decolorizer 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 electric control valve, thereby ensuring that the two decolorizers are appropriately injected into the corresponding accommodating chamber 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, so that the first decolorizer flows into the decolorizer tank first. When the second closed cover plate opens the second injection port, the first closed cover plate closes the first injection port, so that the second decolorizer flows into the decolorizer tank after the first decolorizer is injected, thereby ensuring the release of equal amounts of the two decolorizers. 3. The present invention guides the polyester solution through the injection funnel, ensuring that during the polyester solution injection process, 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 electric control valve. At the same time, the bellows can adaptively stretch and contract when the decolorization tank moves, effectively preventing the polyester solution from splashing out of the decolorization tank, ensuring the flow of the polyester solution, avoiding the disproportionate ratio of the polyester solution to the decolorizer, and improving the decolorization effect of the polyester solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the water-saving polyester decolorization equipment of the present invention; Figure 2 is a plan cross-sectional view of the water-saving polyester decolorization device of the present invention; Figure 3 It is a three-dimensional structural cross-sectional view of the water-saving polyester decolorization equipment of the present invention; Figure 4 It is a partial three-dimensional structural schematic diagram of the decolorization tank, the first release mechanism and the second release mechanism of the water-saving polyester decolorization device of the present invention; Figure 5 The present invention Figure 2 A three-dimensional structural cross-sectional view at AA; Figure 6 It is a schematic diagram of the state of the first release mechanism and the second release mechanism of the water-saving polyester decolorization device of the present invention in a non-working state; Figure 7 It is a schematic diagram of the state of the first release mechanism and the second release mechanism of the water-saving polyester decolorization device of the present invention in the working state; Figure 8 It is a three-dimensional structural cross-sectional view of the decolorization tank and the closed structure of the water-saving polyester decolorization equipment of the present invention; Fig. 9 The present invention Figure 8 An enlarged schematic diagram of point B; Fig.10 The present invention Figure 2Enlarged schematic diagram of point C.

[0018] The numbers in the figure are: 1, shell; 11, liquid injection funnel; 12, bellows; 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 tube body; 311, electric control valve; 32, movable tube body; 4, second release mechanism; 5, closed structure; 51, Pressure cover plate; 511, pressure sensor; 52, first closed cover plate; 521, through port; 53, second closed 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 connector; 631, guide rail; 632, guide wheel; 633, accommodating cavity. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] See also Figure 1-Figure 7 and Fig.10 As shown, a water-saving polyester decolorization device comprises a shell 1 and a decolorization tank 2 arranged in the shell 1 for the polyester solution to react with the decolorization agent, and the two sides of the shell 1 are respectively provided with a first release mechanism 3 and a second release mechanism 4 for putting different decolorization agents into the decolorization tank 2, and the decolorization tank 2 can move downward in the shell 1 along with the injection of the polyester solution to drive the first release mechanism 3 and the second release mechanism 4, and when the decolorization tank 2 automatically descends along with the injection of the polyester solution, the first release mechanism 3 and the second release mechanism 4 are in a sequentially opened state, so that the two decolorization agents are sequentially injected into the decolorization tank 2 to react with the polyester solution.

[0021] The decolorizing tank 2 has a liquid outlet 25 .

[0022] The decolorization tank 2 has a heat preservation layer, which is not shown in the figure. The heat preservation treatment of the heat preservation layer prevents the depolymerized polyester solution from being easily solidified and not flowing below about 100°C.

[0023] The housing 1 is provided with a self-lowering mechanism 6 which can adapt to the gravity of the decolorizing tank 2 and has a reset effect.

[0024] The self-lowering mechanism 6 includes a hydraulic chamber 61, which has an inner chamber 611 and an outer chamber 612 which are interconnected and filled with hydraulic oil. The inner chamber 611 and the outer chamber 612 are connected through a connecting pipe. A first piston 6111 and a second piston 6121 are respectively provided in the inner chamber 611 and the outer chamber 612.

[0025] A guide rod 26 extending downward and fixed to the first piston 6111 is fixedly provided on the decolorization tank 2 .

[0026] The second piston 6121 is provided with a counterweight block 6122 which can maintain the same height as the first piston 6111 when the polyester solution is not injected into the decolorization tank 2.

[0027] The self-lowering mechanism 6 further includes a bottom bracket 62 for supporting the decolorizing tank 2 and sliding connectors 63 arranged on both sides of the bottom bracket 62. A compression spring 621 for achieving a reset effect is arranged between the bottom bracket 62 and the hydraulic chamber 61.

[0028] The sliding connection member 63 includes a guide rail 631 extending in a vertical direction and a guide wheel 632 disposed on the base 62 and in sliding contact with the guide rail 631 .

[0029] When the decolorization tank 2 is unloaded, the first piston 6111 and the second piston 6121 with the counterweight 6122 are in a balanced state, and the heights of the two are consistent. As the polyester solution is continuously injected, the total weight of the decolorization 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 makes the hydraulic oil flow rate and the solution injection speed form a dynamic balance, ensuring that the decolorization tank 2 descends smoothly.

[0030] When the decolorization 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 decolorization tank 2 is precisely guided by the guide wheel 632 and the guide rail 631 of the sliding connection 63, and the compression spring 621 begins to store energy. After the first release mechanism 3 is turned on, the first decolorizer is quantitatively injected into the decolorization tank 2 to react with the polyester solution to dissolve and disperse the pigment in the polyester solution.

[0031] After the first decolorizing agent is injected, the second release mechanism 4 is opened. At this time, the second decolorizing agent is quantitatively injected into the decolorizing tank 2 to react with the polyester solution to dissolve and disperse the remaining pigment structure in the polyester solution.

[0032] When the polyester solution completes the decolorization reaction, the liquid outlet 25 opens 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 chamber 612 flows back to the inner chamber 611 under the gravity of the counterweight block 6122, and the first piston 6111 rises synchronously with the guide rod 26 until it is completely reset.

[0033] See also Figure 2-Figure 7 As shown, a first injection port 21 and a second injection port 22 connected to a first release mechanism 3 and a second release mechanism 4 are respectively provided on both sides of the decolorization tank 2, and a closing structure 5 is provided in the decolorization tank 2. When the closing 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.

[0034] 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 automatically decreases. During the polyester solution injection process, the pressure exerted by the polyester solution acts on the closed structure 5 in the decolorization tank 2, so that the first injection port 21 automatically opens when the closed structure is subjected to the injection pressure, allowing the first decolorant to enter the decolorization tank 2 through the first release mechanism 3 to start reacting with the polyester solution, while the second injection port 22 remains closed at this time, preventing the second decolorant from entering.

[0035] When the polyester solution is completely injected into the decolorization tank 2, the closing structure 5 is in a non-pressurized state, and the decolorization tank 2 stops descending. At this time, the first injection port 21 is automatically closed, and the second injection port 22 is automatically opened when the closing structure is not subjected to the injection pressure, allowing the second decolorant to enter the decolorization tank 2 through the second release mechanism 4 to start reacting with the polyester solution.

[0036] It ensures that the two decolorizing agents react with the polyester solution in sequence, realizes an orderly decolorizing process, and ensures the decolorizing effect of the polyester solution.

[0037] See also Figure 2-Figure 7 As shown, the first release mechanism 3 and the second release mechanism 4 both have a fixed tube body 31 and a movable tube body 32 connected to the corresponding injection port, the fixed tube body 31 is coaxially inserted in 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 accommodating cavity 633 connected to the fixed tube body 31 is formed in the movable tube body 32.

[0038] When the decolorizing tank 2 increases in weight due to the injection of the polyester solution and begins to move downward, the movable tube body 32 descends along with the decolorizing tank 2. At the same time, the accommodating cavity 633 is formed, allowing the decolorizing agent to enter the decolorizing tank 2 through the accommodating cavity 633 formed in the movable tube body 32.

[0039] When the two fixed tubes 31 release the decolorant at the same time, that is, the fixed tubes 31 deliver the decolorant therein through the liquid pump. Since the first injection port 21 is in an open state and the second injection port 22 is in a closed state, the first decolorant continuously flows into the decolorant tank 2 through the first injection port 21 during the descending process of the decolorant tank 2, and the second decolorant is temporarily stored in the formed accommodation cavity 633.

[0040] After the polyester solution is injected, the two fixed tubes 31 simultaneously close the release of the decolorant. At this time, the first decolorant has been injected in an appropriate amount according to the polyester solution. Since the closed structure 5 is not pressurized, the first injection port 21 is in a closed state, and the second injection port 22 is in an open state. The second decolorant temporarily stored in the accommodating cavity 633 and the same amount as the first decolorant flows into the decolorization tank 2 to complete the decolorization of the polyester solution.

[0041] See also Figure 2-Figure 7 As shown, the upper end of each fixed tube body 31 is provided with an electric control valve 311 cooperating with the closed structure 5. When the closed structure 5 is in the working state, the two electric control valves 311 are in the open state at the same time, and when the closed structure 5 is in the non-working state, the two electric control valves 311 are in the closed state at the same time, so that the decolorizing agent can be quantitatively added to the decolorizing tank 2 according to the polyester solution.

[0042] By precisely adjusting the opening of the electric control valve 311 , the decolorizing agent can be released in different proportions, so as to control the amount of the decolorizing agent.

[0043] It is also possible to precisely adjust the initial distance between the movable tube body 32 and the decolorizing tank 2, and then adjust the opening between the movable tube body 32 and the corresponding nozzle, so as to achieve different proportions of decolorizing agent release, so as to control the amount of decolorizing agent. The specific structure capable of adjusting the opening of the first nozzle 21 and the second nozzle 22 is not shown in the figure.

[0044] When the closed structure 5 is subjected to the solution injection pressure, the two electrically controlled valves 311 are opened at the same time, and the two decolorants are respectively injected into the corresponding accommodating chambers 633. The first decolorant 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 decolorant from entering in advance.

[0045] As the decolorizing tank 2 continues to descend, the first decolorizing agent continues to flow into the decolorizing tank 2. As the polyester solution is injected, the closed structure 5 is no longer pressurized, and the two electrically controlled valves 311 are simultaneously switched to a 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 chamber 633 then enters the decolorizing tank 2 through the second injection port 22, and continues to dissolve and disperse the remaining pigment structure.

[0046] It is ensured that both decolorizing agents are accurately added into the decolorizing tank 2 according to the amount of polyester solution injected, thus ensuring the high efficiency and accuracy of the entire decolorizing process.

[0047] See also Figure 2-Figure 9 As shown, the closed structure 5 has a pressure cover plate 51 that is smaller than the decolorization 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 decolorization tank 2, and a pressure sensor 511 elastically connected to the pressure cover plate 51 is provided on the support shaft 23, and each electrically controlled valve 311 is electrically connected to the pressure sensor 511.

[0048] The support shaft 23 is provided with a stirrer 231 for mixing the decolorizing agent and the polyester solution, and a driving source of the stirrer 231 is not shown in the figure.

[0049] When the polyester solution starts to be injected into the decolorizing tank 2, the polyester solution applies pressure to 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 opens the two electric control valves 311 at the same time. At this time, the first closing cover plate 52 opens the first injection port 21, allowing the first decolorizing agent to enter the decolorizing tank 2. The second closing cover plate 53 simultaneously closes the second injection port 22, preventing the second decolorizing agent from entering.

[0050] As the polyester solution is continuously injected, since the size of the pressure cover plate 51 is smaller than the decolorization tank 2, the polyester solution flows into the decolorization tank 2 through the gap between the two. When the polyester solution is injected, the pressure cover plate 51 is no longer pressurized, and the pressure sensor 511 sends a signal to the control system of the electric control valve 311, so that the fixed tube body 31 stops injecting the decolorant. At this time, the first closed cover plate 52 closes the first injection port 21 to stop the inflow of the first decolorant, and the second closed cover plate 53 opens the second injection port 22 to allow the second decolorant to enter the decolorization tank 2. Ensure that the two decolorants are added to the decolorization tank 2 quantitatively and orderly as needed.

[0051] When the decolorizing agent enters the decolorizing tank 2, the agitator 231 starts to work to fully mix the decolorizing agent with the polyester solution to ensure uniform reaction, improve the decolorizing effect, and avoid reaction between the two decolorizing agents.

[0052] See also Figure 5-Figure 8 As shown, the first closed cover plate 52 and the second closed cover plate 53 are both tightly fitted with the inner wall of the decolorizing tank 2, and the first closed cover plate 52 and the second closed cover plate 53 respectively have a through hole 521 that can connect the first injection port 21 and the second injection port 22.

[0053] 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 port are tightly fitted to the inner wall of the decolorizing tank 2, ensuring that the decolorizing agent will not accidentally enter the decolorizing tank 2, thereby ensuring the accuracy of the injection amount.

[0054] 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 opening 521 with the injection port enables precise control of the injection of the decolorant into the decolorization tank 2 .

[0055] See also Figure 6-Figure 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, and a liquid level sensor 241 for detecting the liquid level is provided on the step 24. When the first closed cover plate 52 contacts the step 24, the through port 521 on the first closed cover plate 52 is in a precisely connected state with the first injection port 21.

[0056] 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 to the first injection port 21, ensuring that the first decolorant can accurately enter the decolorization tank 2, avoiding the situation of a small amount of injection. At this time, the second closing cover plate 53 tightly closes the second injection port 22 to prevent the second decolorant from reacting with the first decolorant.

[0057] During the process of injecting the polyester solution and the decolorizing agent into the decolorizing tank 2 , the liquid level sensor 241 monitors the liquid level change in real time to prevent the liquid level from exceeding the first injection port 21 and the second injection port 22 to affect the injection of the decolorizing agent.

[0058] See also Figure 6 and Figure 7 As shown, a liquid injection funnel 11 facing the center of the pressure cover plate 51 is provided on the shell 1, and a bellows 12 is provided between the liquid injection funnel 11 and the decolorization tank 2 to prevent the polyester solution from splashing out of the decolorization tank 2.

[0059] The maximum extension length of the bellows 12 is greater than the maximum displacement of the decolorizing tank 2 .

[0060] Since the maximum extension length of the bellows 12 is greater than the maximum displacement of the decolorizing tank 2, and the decolorizing tank 2 is in a slow operation state when descending and ascending, the wear rate of the bellows 12 is relatively low and can meet the continuous operation requirements.

[0061] During the process of injecting the polyester solution, the polyester solution is firstly guided to act on the pressure cover plate 51 through the injection funnel 11, so that the pressure cover plate 51 links 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. In this process, the sealing of the bellows 12 prevents the polyester solution from splashing out of the decolorization tank 2 on the pressure cover plate 51.

[0062] As the decolorization tank 2 moves, the bellows 12 can adaptively expand and contract, thereby effectively preventing the polyester solution from splashing out of the decolorization tank 2 during continuous injection.

[0063] The water-saving polyester decolorization process is applied to the water-saving polyester decolorization equipment, and comprises the following steps: S1, pouring the polyester solution into the decolorization tank 2 and starting 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 decolorizing 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 decolorizing tank 2 through the second injection port 22 to mix with the polyester solution.

[0064] The water-saving polyester decolorization equipment is used in the decolorization treatment, and the water-saving polyester decolorization equipment described above is adopted.

[0065] The present invention accurately controls the sequential injection of the two decolorizing agents through the cooperation of the closed structure 5 and the electric control valve 311, ensuring that the two decolorizing agents will not react with each other, thereby improving the decolorizing effect of the polyester solution.

[0066] During the polyester solution injection process, the 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, and realizes the first decolorant injection first, and then switches to the injection of the second decolorant. After the polyester solution is injected, the two decolorants stop releasing at the same time, ensuring the best ratio of the polyester solution and the decolorant.

[0067] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A water-saving polyester decolorization device, comprising a housing (1) and a decolorization tank (2) arranged in the housing (1) for reacting a polyester solution with a decolorizing agent; characterized in that: A first release mechanism (3) and a second release mechanism (4) for injecting different decolorizing agents into the decolorizing tank (2) are respectively provided on both sides of the shell (1); the decolorizing tank (2) can move downward in the shell (1) as the polyester solution is injected to drive the first release mechanism (3) and the second release mechanism (4); when the decolorizing tank (2) automatically descends as the polyester solution is injected, the first release mechanism (3) and the second release mechanism (4) are in a sequentially opened state, so that the two decolorizing agents are sequentially injected into the decolorizing tank (2) to react with the polyester solution.

2. The water-saving polyester decolorization equipment according to claim 1, characterized in that: A first injection port (21) and a second injection port (22) connected to a first release mechanism (3) and a second release mechanism (4) are respectively provided on both sides of the decolorization tank (2). A closed structure (5) is provided in the decolorization tank (2). When the closed 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.

3. The water-saving polyester decolorization equipment according to claim 2, characterized in that: The first release mechanism (3) and the second release mechanism (4) both have a fixed tube body (31) and a movable tube body (32) connected to a corresponding injection port, the fixed tube body (31) being coaxially inserted in the movable tube body (32), the movable tube body (32) being able to move with the decolorizing tank (2), and when the decolorizing tank (2) moves downward, a receiving cavity (633) connected to the fixed tube body (31) is formed in the movable tube body (32).

4. The water-saving polyester decolorization equipment according to claim 3, characterized in that: An electric control valve (311) cooperating with the closed structure (5) is provided at the upper end of each fixed tube body (31); when the closed structure (5) is in a working state, the two electric control valves (311) are simultaneously in an open state, and when the closed structure (5) is in a non-working state, the two electric control valves (311) are simultaneously in a closed state, so that the decolorizing agent can be quantitatively added to the decolorizing tank (2) according to the polyester solution.

5. The water-saving polyester decolorization equipment according to claim 4, characterized in that: The closed structure (5) comprises a pressure cover plate (51) whose size is 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). A pressure sensor (511) elastically connected to the pressure cover plate (51) is provided on the support shaft (23). Each electrically controlled valve (311) is electrically connected to the pressure sensor (511).

6. The water-saving polyester decolorization equipment according to claim 5, characterized in that: The first closed cover plate (52) and the second closed cover plate (53) are both tightly fitted 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 a through hole (521) capable of connecting the first injection port (21) and the second injection port (22).

7. The water-saving polyester decolorization equipment according to claim 6, characterized in that: A step (24) is provided in the decolorizing tank (2) below the first injection port (21) and the second injection port (22), and a liquid level sensor (241) for detecting the liquid level is provided on the step (24). When the first closed cover plate (52) contacts the step (24), the through opening (521) on the first closed cover plate (52) is in a precisely connected state with the first injection port (21).

8. The water-saving polyester decolorization equipment according to claim 5, characterized in that: The shell (1) is provided with a liquid injection funnel (11) facing the center of the pressure cover plate (51), and a bellows (12) is provided between the liquid injection funnel (11) and the decolorization tank (2) to prevent the polyester solution from splashing out of the decolorization tank (2).

9. A water-saving polyester decolorization process, applied to the water-saving polyester decolorization equipment according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, pouring the polyester solution into the decolorization tank (2) and activating 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 decolorizing 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 decolorizing tank (2) through the second injection port (22) to mix with the polyester solution.

10. The application of water-saving polyester decolorization equipment in decolorization treatment is characterized by: The water-saving polyester decolorization equipment as described in any one of claims 1 to 8 is used.

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