Waste liquid recovery equipment for ink jet printing and method thereof

Abstract

The invention relates to the technical field of solution recovery, in particular to waste liquid recovery equipment for ink jet printing and a method thereof.The waste liquid recovery equipment comprises a supporting frame, a waste liquid treatment device and a filter pressing device, the waste liquid treatment device comprises a treatment tank, a stirring device arranged in the treatment tank and a plurality of solvent adding pipes regularly arranged on the top surface of the treatment tank. According to the waste liquid recovery equipment for ink-jet printing and the method thereof, after a stirring motor is started, waste liquid can be fully stirred, and a solvent in an outer sleeve pipe body can be synchronously stirred by driving a fixed ring tooth to rotate, so that the precipitation or layering phenomenon of the solvent due to long-time placement is effectively prevented, and the recovery efficiency of the waste liquid is improved. Meanwhile, the reciprocating sliding block can be driven to move up and down to be matched with an inflator to complete pressurization work in the outer sleeve body, and a guarantee is provided for solvent adding.

Description

Technical Field

[0001] The invention relates to the technical field of solution recovery, in particular to waste liquid recovery equipment and method for inkjet printing. Background Art

[0002] The inkjet printing waste liquid recovery equipment is an environmentally friendly equipment used to collect and treat the waste liquid generated during the inkjet printing process. The equipment introduces the waste liquid through the discharge port and the discharge pipe. The built-in filtering device can effectively filter out the waste ink in the waste liquid to obtain waste liquid without waste ink.

[0003] The patent application number CN201620108696.4 discloses a gravure ink solvent recovery machine, which includes an ink cartridge connected to a support, a vibrating screen, a vacuum stirring device and a feed hopper, and a sealing device is provided between the feed hopper and the vacuum stirring device; a plurality of horizontally arranged stirring rods are provided in the vacuum stirring device, and the sides thereof are respectively connected to a stirring motor and a vacuum device, and the stirring rods are also connected to a heater to heat them, so as to achieve ink heating. The structure is simple and the manufacturing is convenient, which reduces the large amount of bubbles generated by the recycled ink during use and improves the quality of the recycled gravure ink.

[0004] However, the existing equipment is unable to fully stir the waste liquid and the solvent at the same time. During the stirring process of the waste liquid, the solvent will also precipitate or stratify due to long-term storage, affecting the treatment effect. The addition of additional stirring devices will increase the cost of the overall equipment. In addition, the existing equipment requires more manual operation when adding solvents, and setting up additional equipment or devices to complete the solvent addition work increases the investment cost and maintenance difficulty of the equipment.

[0005] In view of this, we propose a waste liquid recovery device and method for inkjet printing. Summary of the invention

[0006] The object of the present invention is to provide a waste liquid recovery device and method for inkjet printing to solve the problems raised in the above background technology.

[0007] To achieve the above object, on the one hand, the present invention provides the following technical solutions: A waste liquid recovery device for inkjet printing, comprising a support frame and a waste liquid treatment device and a filter press device arranged on the top surface of the support frame, wherein the waste liquid treatment device comprises a treatment tank, a stirring device arranged inside the treatment tank, and a plurality of solvent adding pipes regularly arranged on the top surface of the treatment tank; The processing tank comprises a fixed tank body, a liquid outlet pipe arranged at the bottom of the fixed tank body, and an infusion pump for conveying liquid; The stirring device comprises a stirring motor, a stirring rod arranged on the output shaft of the stirring motor, a plurality of stirring blades rotating together with the stirring rod, a rotating ring rotating along with the rotation of the stirring rod, and fixed ring teeth arranged on the inner ring wall of the rotating ring; The solvent adding tube comprises an outer sleeve body, a transmission rod that rotates with the rotation of the limiting ring body, a plurality of rod wall convex pieces regularly arranged on the outer side wall of the transmission rod, a reciprocating screw that rotates with the transmission rod, a reciprocating slider that moves up and down in coordination with the reciprocating screw, an air pump arranged on the top surface of the outer sleeve body, and a liquid blocking portion arranged on the bottom surface of the outer sleeve body; The liquid blocking part includes a liquid discharge pipe, an outer convex pipe integrally formed on the outer side of the liquid discharge pipe, a nozzle arranged at the bottom end of the liquid discharge pipe, a liquid blocking block slidably connected to the inner side of the outer convex pipe, and a pressure spring that pushes the liquid blocking block to move by its own elastic force.

[0008] In the technical solution of the present invention, the fixed tank body is fixedly connected to the top bracket of the support frame by bolts, a limiting annular groove is provided on the inner top surface of the fixed tank body, one end of the liquid outlet pipe is connected to the discharge port flange at the bottom of the fixed tank body, and the other end is connected to the liquid inlet flange of the infusion pump, and the pipe of the liquid outlet of the infusion pump is connected to the pipe mouth flange of the filter tube of the filter press device.

[0009] In the technical solution of the present invention, the stirring motor is fixedly connected to the top surface of the fixed tank body by bolts, the stirring rod is coaxially connected to the output shaft of the stirring motor, the stirring blades are fixedly connected to the outer wall of the stirring rod by screws, and a number of regularly distributed scrapers are clamped and fixed at the outer wall of the stirring rod near the bottom end.

[0010] In the technical solution of the present invention, a rod end gear is clamped and fixed to the top end of the stirring rod, a transmission gear is meshed on one side of the rod end gear, and the transmission gear is rotatably connected to the inner top surface of the fixed tank body.

[0011] In the technical solution of the present invention, a ring wall groove is provided on the outer ring wall of the rotating ring, a limiting ring body adapted to the size of the limiting ring groove is integrally formed on the top surface of the rotating ring, and a fixed ring tooth is fixedly connected to the inner ring wall of the rotating ring by bolts, and the fixed ring tooth is meshed with the transmission gear.

[0012] In the technical solution of the present invention, the outer sleeve body is fixedly connected to the top surface of the fixed tank body by bolts, the upper and lower ends of the transmission rod are rotatably connected to the outer side walls of the upper and lower ends of the outer sleeve body respectively, the bottom end of the transmission rod extends to the interior of the fixed tank body and a rod bottom gear is clamped at the end position, and the rod wall protrusion is clamped and fixed to the outer side wall of the transmission rod.

[0013] In the technical solution of the present invention, the reciprocating screw is coaxially connected to the transmission rod, and the top surface of the outer sleeve body is fixedly connected to the limiting bracket by screws. The reciprocating slider is sleeved on the outside of the reciprocating screw and the protrusion at one end is slidably connected to the round rod inside the limiting bracket. The air pump is clamped on the top surface of the outer sleeve body and the top end of the center rod of the internal piston plate is clamped and fixed to the reciprocating slider.

[0014] In the technical solution of the present invention, the drain pipe is clamped and fixed on the bottom surface of the outer sleeve body, the bottom end of the drain pipe extends to the interior of the fixed tank body, the inner pipe mouth position of the external convex tube is in conflict with the outer ring wall of the rotating ring, and the nozzle is threadedly connected to the bottom pipe mouth of the drain pipe.

[0015] In the technical solution of the present invention, one end of the pressure spring is adhered to the inner tube wall of the outer convex tube, and the other end is adhered to the outer wall of the liquid blocking block. The liquid blocking block is slidably connected to the inside of the outer convex tube and has a connecting hole on the top surface that runs through the top and bottom and is compatible with the inner tube diameter of the discharge pipe.

[0016] On the other hand, the present invention also provides a method for recycling waste liquid for inkjet printing, using the above-mentioned waste liquid recycling device for inkjet printing, comprising the following steps: S1. First, pour the collected inkjet printing waste liquid into the fixed tank body in the treatment tank, and put the solid decolorant, coagulant and flocculant into the outer sleeve body of the three solvent adding tubes in turn according to the direction of rotation of the rotating ring; S2, then, starting the stirring motor to drive the stirring rod to rotate, and making the stirring blade and the scraper rotate at the same time to stir the inkjet printing waste liquid inside; S3. At this time, the rod end gear rotating with the stirring rod will drive the transmission gear to rotate. After the transmission gear contacts the fixed ring teeth, it drives the rotating ring to rotate as a whole. S4. As the fixed ring teeth rotate with the rotating ring, they will drive the three rod bottom gears to rotate at the same time, causing the transmission rod together with the rod wall convex piece and the reciprocating screw rod at the top to rotate, thereby causing the reciprocating slider to move up and down, and cooperate with the air pump to increase the pressure inside the outer sleeve body; S5. Subsequently, when the ring wall groove on the rotating ring moves to the bottom of the first solvent adding tube, the liquid blocking block in the liquid blocking portion will extend to the inside of the ring wall groove under the elastic force of the pressure spring, so that the solid decolorizing agent in the outer sleeve body enters the inside of the nozzle through the connecting hole on the liquid blocking block, and is added to the inside of the fixed tank body by the nozzle; S6. At this time, the solid decolorizing agent is fully mixed with the waste liquid of inkjet printing through the continuously rotating stirring blades, and the continuously rotating rotating ring then adds the coagulant to the interior of the fixed tank. The waste liquid of inkjet printing will produce many fine particles during the stirring process, and cooperate with the flocculant added at the end to make the fine particles coagulate together; S7. After that, without turning off the stirring motor, start the infusion pump to send the treated inkjet printing waste liquid in the fixed tank into the interior of the filter press device. After the filter press device filters the condensed particles, the clear recycled water is discharged through the external faucet.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The waste liquid recovery equipment and method for inkjet printing can not only fully stir the waste liquid after the stirring motor is started, but also synchronously stir the solvent in the outer sleeve body by driving the rotation of the fixed ring teeth, effectively preventing the precipitation or stratification of the solvent due to long-term storage. At the same time, it can also drive the reciprocating slider to move up and down, cooperate with the air pump to complete the pressurization work inside the outer sleeve body, and provide a guarantee for the addition of the solvent.

[0018] 2. The waste liquid recovery device and method for inkjet printing, when the rotating ring rotates with the stirring rod, the annular wall grooves on the outer wall can cooperate with the liquid blocking part to automatically add the solvent in the outer sleeve body to the interior of the fixed tank body, thereby improving the automation degree of the overall structure, reducing the errors of manual operation, and effectively reducing the investment cost of additional equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the waste liquid treatment device in the present invention; Figure 3 It is a schematic cross-sectional view of the structure of the waste liquid treatment device in the present invention; Figure 4 It is a schematic diagram of the cross-section structure of the treatment tank in the present invention; Figure 5 For the present invention Figure 4 A magnified schematic diagram of part A; Figure 6 It is a schematic diagram of the structural disassembly of the stirring device in the present invention; Figure 7 It is a partial structural schematic diagram of the stirring device in the present invention; Figure 8 It is a schematic cross-sectional view of the structure of the solvent adding tube in the present invention; Fig. 9 It is a partial structural schematic diagram of the solvent adding tube in the present invention; Fig.10 It is a schematic cross-sectional view of the structure of the liquid-blocking portion in the present invention; Description of reference numerals: 100. Support frame; 200, waste liquid treatment device; 210, treatment tank; 211, fixed tank body; 2110, limiting ring groove; 212, liquid outlet pipe; 213, infusion pump; 220, stirring device; 221, stirring motor; 222, stirring rod; 223, stirring blade; 224, scraper; 225, rod end gear; 226, transmission gear; 227, rotating ring; 2270, ring wall groove; 2271, limiting ring body; 228, fixed ring gear; 230, solvent adding tube; 231, outer sleeve body; 232, transmission rod; 233, rod wall convex piece; 234, rod bottom gear; 235, reciprocating screw rod; 236, limit bracket; 237, reciprocating slider; 238, air pump; 239, liquid blocking part; 2390, liquid discharge pipe; 2391, external convex pipe; 2392, nozzle; 2393, pressure spring; 2394, liquid blocking block; 300. Filter press device. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 10 As shown, this embodiment provides a technical solution: The waste liquid recovery equipment for inkjet printing includes a support frame 100 and a waste liquid treatment device 200 and a filter press device 300 arranged on the top surface of the support frame 100. The waste liquid treatment device 200 includes a treatment tank 210, a stirring device 220 arranged inside the treatment tank 210, and a plurality of solvent addition tubes 230 regularly arranged on the top surface of the treatment tank 210.

[0022] In this embodiment, Figure 4-Figure 5 As shown, the processing tank 210 includes a fixed tank body 211, a liquid outlet pipe 212 arranged at the bottom of the fixed tank body 211, and an infusion pump 213 for conveying liquid.

[0023] Specifically, the fixed tank body 211 is fixedly connected to the top bracket of the support frame 100 by bolts, and a limiting annular groove 2110 is provided on the inner top surface of the fixed tank body 211. One end of the liquid outlet pipe 212 is connected to the discharge port flange at the bottom of the fixed tank body 211, and the other end is connected to the liquid inlet flange of the infusion pump 213. The pipe of the liquid outlet of the infusion pump 213 is connected to the pipe mouth flange of the filter tube of the filter press device 300.

[0024] Furthermore, the fixed tank body 211 is used to place waste liquid from inkjet printing, and the limiting ring groove 2110 is used to limit the rotation range of the internal structure of the stirring device 220. After the infusion pump 213 is started, the waste liquid in the fixed tank body 211 is sent into the interior of the filter press device 300 through the liquid outlet pipe 212.

[0025] In this embodiment, Figure 6-Figure 7 As shown, the stirring device 220 includes a stirring motor 221, a stirring rod 222 arranged on the output shaft of the stirring motor 221, a plurality of stirring blades 223 rotating together with the stirring rod 222, a rotating ring 227 rotating as the stirring rod 222 rotates, and fixed ring teeth 228 arranged on the inner ring wall of the rotating ring 227.

[0026] Specifically, the stirring motor 221 is fixedly connected to the top surface of the fixed tank body 211 by bolts, the stirring rod 222 is coaxially connected to the output shaft of the stirring motor 221, the stirring blade 223 is fixedly connected to the outer wall of the stirring rod 222 by screws, and a number of regularly distributed scrapers 224 are clamped and fixed at a position near the bottom end of the outer wall of the stirring rod 222.

[0027] Furthermore, a rod end gear 225 is clamped and fixed on the top end of the stirring rod 222 , and a transmission gear 226 is meshed on one side of the rod end gear 225 . The transmission gear 226 is rotatably connected to the inner top surface of the fixed tank body 211 .

[0028] Furthermore, a ring wall groove 2270 is provided on the outer ring wall of the rotating ring 227, and a limiting ring body 2271 that is adapted to the size of the limiting ring groove 2110 is integrally formed on the top surface of the rotating ring 227. A fixed ring tooth 228 is fixedly connected to the inner ring wall of the rotating ring 227 by bolts, and the fixed ring tooth 228 is meshed with the transmission gear 226.

[0029] Furthermore, after the stirring motor 221 is started, it drives the stirring rod 222 to rotate, and the stirring blades 223 and the scraper 224 rotate at the same time to stir the internal inkjet printing waste liquid. At this time, the rod end gear 225 that rotates with the stirring rod 222 will drive the transmission gear 226 to rotate. After the transmission gear 226 contacts the fixed ring gear 228, it drives the rotating ring 227 to rotate as a whole.

[0030] In this embodiment, Figure 8-Figure 9 As shown, the solvent addition tube 230 includes an outer sleeve body 231, a transmission rod 232 that rotates as the limiting ring body 2271 rotates, a plurality of rod wall protrusions 233 regularly arranged on the outer wall of the transmission rod 232, a reciprocating screw 235 that rotates together with the transmission rod 232, a reciprocating slider 237 that cooperates with the reciprocating screw 235 to move up and down, an air pump 238 arranged on the top surface of the outer sleeve body 231, and a liquid blocking portion 239 arranged on the bottom surface of the outer sleeve body 231.

[0031] Specifically, the outer sleeve body 231 is fixedly connected to the top surface of the fixed tank body 211 by bolts, and the upper and lower ends of the transmission rod 232 are rotatably connected to the outer side walls of the upper and lower ends of the outer sleeve body 231 respectively. The bottom end of the transmission rod 232 extends to the interior of the fixed tank body 211 and a rod bottom gear 234 is clamped at the end position, and the rod wall protrusion 233 is clamped and fixed to the outer side wall of the transmission rod 232.

[0032] Furthermore, the reciprocating screw 235 is coaxially connected to the transmission rod 232, and the top surface of the outer sleeve body 231 is fixedly connected to the limiting bracket 236 by screws. The reciprocating slider 237 is sleeved on the outside of the reciprocating screw 235 and the protrusion at one end is slidably connected to the round rod inside the limiting bracket 236. The air pump 238 is clamped on the top surface of the outer sleeve body 231 and the top end of the center rod of the internal piston plate is clamped and fixed to the reciprocating slider 237.

[0033] Furthermore, the outer sleeve body 231 is used to place the solvent that reacts with the inkjet printing waste liquid. When the fixed ring gear 228 rotates with the rotating ring 227, it will drive the three rod bottom gears 234 to rotate at the same time, and the transmission rod 232 together with the rod wall protrusion 233 and the reciprocating screw 235 at the top will rotate. When the rod wall protrusion 233 rotates, it is used to continuously stir the solvent in the outer sleeve body 231 to prevent the solvent from stratifying after being placed for a long time. When the reciprocating screw 235 rotates, the reciprocating slider 237 will move back and forth up and down inside the limit bracket 236, thereby driving the internal piston plate of the air pump 238 to move up and down, and the pressure inside the outer sleeve body 231 is increased through the air pump 238.

[0034] In this embodiment, Fig.10 As shown, the liquid blocking portion 239 includes a liquid discharge pipe 2390, an outer convex tube 2391 integrally formed on the outside of the liquid discharge pipe 2390, a nozzle 2392 arranged at the bottom end of the liquid discharge pipe 2390, a liquid blocking block 2394 slidably connected to the inside of the outer convex tube 2391, and a pressure spring 2393 that pushes the liquid blocking block 2394 to move by its own elastic force.

[0035] Specifically, the drain pipe 2390 is clamped and fixed on the bottom surface of the outer sleeve body 231, and the bottom end of the drain pipe 2390 extends to the interior of the fixed tank body 211. The inner pipe mouth of the outer convex tube 2391 is in conflict with the outer ring wall of the rotating ring 227, and the nozzle 2392 is threadedly connected to the bottom pipe mouth of the drain pipe 2390.

[0036] Furthermore, one end of the pressure spring 2393 is adhered to the inner tube wall of the external convex tube 2391, and the other end is adhered to the outer wall of the liquid blocking block 2394. The liquid blocking block 2394 is slidably connected to the inside of the external convex tube 2391 and has a connecting hole on the top surface that runs through the top and bottom and is compatible with the inner tube diameter of the discharge pipe 2390.

[0037] Furthermore, when the annular wall groove 2270 on the rotating ring 227 moves to the bottom of the solvent adding tube 230, the liquid blocking block 2394 in the liquid blocking portion 239 will extend to the interior of the annular wall groove 2270 under the elastic force of the pressure spring 2393, allowing the solvent in the outer sleeve body 231 to enter the interior of the nozzle 2392 through the connecting hole on the liquid blocking block 2394, and be added to the interior of the fixed tank body 211 by the nozzle 2392.

[0038] The present invention also provides a method for recycling waste liquid for inkjet printing, using the above-mentioned waste liquid recycling device for inkjet printing, comprising the following steps: S1. First, pour the collected inkjet printing waste liquid into the fixed tank body 211 in the treatment tank 210, and put the solid decolorant, coagulant and flocculant into the outer sleeve body 231 of the three solvent adding tubes 230 in sequence according to the direction of rotation of the rotating ring 227; S2, then, start the stirring motor 221 to drive the stirring rod 222 to rotate, and make the stirring blade 223 and the scraper 224 rotate at the same time to stir the inkjet printing waste liquid inside; S3. At this time, the rod end gear 225 rotating together with the stirring rod 222 drives the transmission gear 226 to rotate. After the transmission gear 226 contacts the fixed ring gear 228, it drives the rotating ring 227 to rotate as a whole. S4, the fixed ring gear 228 rotates with the rotating ring 227, and drives the three rod bottom gears 234 to rotate at the same time, so that the transmission rod 232, the rod wall protrusion 233 and the reciprocating screw rod 235 at the top rotate, and then the reciprocating slider 237 moves up and down, and cooperates with the air pump 238 to increase the pressure inside the outer sleeve body 231; S5. Subsequently, when the annular wall groove 2270 on the rotating ring 227 moves to the bottom of the first solvent adding tube 230, the liquid blocking block 2394 in the liquid blocking portion 239 extends to the inside of the annular wall groove 2270 under the elastic force of the pressure spring 2393, and the solid decolorizing agent in the outer sleeve body 231 enters the inside of the nozzle 2392 through the connecting hole on the liquid blocking block 2394, and is added to the inside of the fixed tank body 211 by the nozzle 2392; S6. At this time, the solid decolorant is fully mixed with the waste liquid of inkjet printing through the continuously rotating stirring blade 223, and the continuously rotating rotating ring 227 then adds the coagulant into the interior of the fixed tank 211. The waste liquid of inkjet printing will produce many fine particles during the stirring process, and cooperate with the flocculant added at the end to make the fine particles coagulate together; S7. After that, without turning off the stirring motor 221, start the infusion pump 213 to send the treated inkjet printing waste liquid in the fixed tank 211 into the interior of the filter press device 300. After the filter press device 300 filters the condensed particles, the clear recycled water is discharged through the external faucet.

[0039] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the specification and its equivalents.

Claims

1. A waste liquid recycling device for inkjet printing, comprising a support frame (100) and a waste liquid treatment device (200) and a filter press device (300) arranged on the top surface of the support frame (100), wherein the waste liquid treatment device (200) comprises a treatment tank (210), a stirring device (220) arranged inside the treatment tank (210), and a plurality of solvent addition pipes (230) regularly arranged on the top surface of the treatment tank (210); The processing tank (210) comprises a fixed tank body (211), a liquid outlet pipe (212) arranged at the bottom of the fixed tank body (211), and an infusion pump (213) for conveying liquid; Features: The stirring device (220) comprises a stirring motor (221), a stirring rod (222) arranged on an output shaft of the stirring motor (221), a plurality of stirring blades (223) rotating along with the stirring rod (222), a rotating ring (227) rotating along with the rotation of the stirring rod (222), and fixed ring teeth (228) arranged on an inner ring wall of the rotating ring (227); The solvent addition tube (230) comprises an outer sleeve body (231), a transmission rod (232) that rotates as the limiting ring body (2271) rotates, a plurality of rod wall protrusions (233) regularly arranged on the outer side wall of the transmission rod (232), a reciprocating screw rod (235) that rotates together with the transmission rod (232), a reciprocating slider (237) that moves up and down in coordination with the reciprocating screw rod (235), an air pump (238) arranged on the top surface of the outer sleeve body (231), and a liquid blocking portion (239) arranged on the bottom surface of the outer sleeve body (231); The liquid blocking portion (239) comprises a liquid discharge pipe (2390), an outer convex pipe (2391) integrally formed on the outside of the liquid discharge pipe (2390), a nozzle (2392) arranged at the bottom end of the liquid discharge pipe (2390), a liquid blocking block (2394) slidably connected to the inside of the outer convex pipe (2391), and a pressure spring (2393) that pushes the liquid blocking block (2394) to move by its own elastic force.

2. The waste liquid recovery device for inkjet printing according to claim 1, characterized in that: The fixed tank body (211) is fixedly connected to the top bracket of the support frame (100) by means of bolts; a limiting annular groove (2110) is provided on the inner top surface of the fixed tank body (211); one end of the liquid outlet pipe (212) is connected to the liquid discharge flange at the bottom of the fixed tank body (211); the other end is connected to the liquid inlet flange of the infusion pump (213); and the pipe of the liquid outlet of the infusion pump (213) is connected to the pipe mouth flange of the filter tube of the filter press device (300).

3. The waste liquid recovery device for inkjet printing according to claim 2, characterized in that: The stirring motor (221) is fixedly connected to the top surface of the fixed tank body (211) by means of bolts, the stirring rod (222) is coaxially connected to the output shaft of the stirring motor (221), the stirring blade (223) is fixedly connected to the outer wall of the stirring rod (222) by means of screws, and a plurality of regularly distributed scrapers (224) are clamped and fixed at positions near the bottom end of the outer wall of the stirring rod (222).

4. The waste liquid recovery device for inkjet printing according to claim 3, characterized in that: A rod end gear (225) is clamped and fixed at the top end of the stirring rod (222), and a transmission gear (226) is meshed on one side of the rod end gear (225). The transmission gear (226) is rotatably connected to the inner top surface of the fixed tank body (211).

5. The waste liquid recovery device for inkjet printing according to claim 4, characterized in that: A ring wall groove (2270) is provided on the outer ring wall of the rotating ring (227); a limiting ring body (2271) having a size matching that of the limiting ring groove (2110) is integrally formed on the top surface of the rotating ring (227); a fixed ring tooth (228) is fixedly connected to the inner ring wall of the rotating ring (227) by means of bolts; the fixed ring tooth (228) meshes with the transmission gear (226).

6. The waste liquid recovery device for inkjet printing according to claim 5, characterized in that: The outer sleeve body (231) is fixedly connected to the top surface of the fixed tank body (211) by bolts, and the upper and lower ends of the transmission rod (232) are rotatably connected to the outer side walls of the upper and lower ends of the outer sleeve body (231), respectively. The bottom end of the transmission rod (232) extends into the interior of the fixed tank body (211) and a rod bottom gear (234) is clamped at the end position. The rod wall protrusion (233) is clamped and fixed to the outer side wall of the transmission rod (232).

7. The waste liquid recovery device for inkjet printing according to claim 6, characterized in that: The reciprocating screw (235) is coaxially connected to the transmission rod (232); the top surface of the outer sleeve body (231) is fixedly connected to a limiting bracket (236) by screws; the reciprocating slider (237) is sleeved on the outside of the reciprocating screw (235) and a protrusion at one end thereof is slidably connected to a round rod inside the limiting bracket (236); the air pump (238) is clamped on the top surface of the outer sleeve body (231) and the top end of the center rod of the internal piston plate is clamped and fixed to the reciprocating slider (237).

8. The waste liquid recovery device for inkjet printing according to claim 7, characterized in that: The drain pipe (2390) is clamped and fixed on the bottom surface of the outer sleeve body (231), and the bottom end of the drain pipe (2390) extends to the interior of the fixed tank body (211). The inner pipe opening of the outer convex tube (2391) is in conflict with the outer ring wall of the rotating ring (227), and the nozzle (2392) is threadedly connected to the bottom pipe opening of the drain pipe (2390).

9. The waste liquid recovery device for inkjet printing according to claim 8, characterized in that: One end of the pressure spring (2393) is adhered to the inner wall of the outer convex tube (2391), and the other end is adhered to the outer wall of the liquid blocking block (2394). The liquid blocking block (2394) is slidably connected to the inside of the outer convex tube (2391) and has a connecting hole on the top surface that runs through the top and bottom and matches the inner diameter of the discharge tube (2390).

10. A method for recycling waste liquid for inkjet printing, using the waste liquid recycling device for inkjet printing according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. First, the collected inkjet printing waste liquid is poured into the fixed tank body (211) in the treatment tank (210), and the solid decolorizing agent, coagulant and flocculant are sequentially placed into the outer sleeve body (231) of the three solvent adding tubes (230) according to the direction of rotation of the rotating ring (227); S2, then, starting the stirring motor (221) to drive the stirring rod (222) to rotate, and causing the stirring blade (223) and the scraper (224) to rotate at the same time to stir the inkjet printing waste liquid inside; S3. At this time, the rod end gear (225) rotates together with the stirring rod (222) and drives the transmission gear (226) to rotate. After the transmission gear (226) contacts the fixed ring gear (228), it drives the rotating ring (227) to rotate as a whole. S4, the fixed ring gear (228) rotates with the rotating ring (227), which drives the three rod bottom gears (234) to rotate at the same time, so that the transmission rod (232) together with the rod wall protrusion (233) and the reciprocating screw rod (235) at the top rotate, thereby causing the reciprocating slider (237) to move up and down, and cooperate with the air pump (238) to increase the pressure inside the outer sleeve body (231); S5. Subsequently, when the annular wall groove (2270) on the rotating ring (227) moves to the bottom of the first solvent adding tube (230), the liquid blocking block (2394) in the liquid blocking portion (239) extends to the inside of the annular wall groove (2270) under the elastic force of the pressure spring (2393), allowing the solid decolorizing agent in the outer sleeve body (231) to enter the inside of the nozzle (2392) through the connecting hole on the liquid blocking block (2394), and then be added to the inside of the fixed tank body (211) by the nozzle (2392); S6. At this time, the solid decolorizing agent is fully mixed with the waste liquid of inkjet printing through the continuously rotating stirring blade (223), and the continuously rotating rotating ring (227) then adds the coagulant into the interior of the fixed tank (211). The waste liquid of inkjet printing will produce many fine particles during the stirring process, and cooperate with the flocculant added at the end to make the fine particles coagulate together; S7. Afterwards, without turning off the stirring motor (221), the infusion pump (213) is started to deliver the treated inkjet printing waste liquid in the fixed tank (211) into the interior of the filter press device (300). After the filter press device (300) filters the condensed particles, the clear recycled water is discharged through an external faucet.

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