TPU (thermoplastic polyurethane) film recycling equipment
Through integrated design and vacuum system processing, the problems of low efficiency and uneven temperature caused by equipment dispersion in TPU film recycling equipment have been solved, and efficient and uniform TPU film recycling and reuse have been achieved, improving the quality of finished products and production efficiency.
Patent Information
- Application Number
- CN202510883211.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-28
- Publication Date
- 2025-09-16
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing TPU film recycling and reuse equipment has low production efficiency due to its scattered equipment layout and complex operating procedures. It is also prone to temperature unevenness during the crushing and heating processes, affecting the quality of the finished product.
The integrated design integrates functional modules such as the crushing chamber, separation chamber and heating barrel. It uses stirring rods and stirring blades for uniform heating, combines a vacuum system and high-speed rotating blades to separate gases, uses stirring blades to eliminate bubbles, and uses a vacuum pump to create negative pressure to separate bubbles, realizing an integrated processing flow.
It improves production efficiency, ensures temperature uniformity and finished product quality, reduces manual intervention, and improves the degree of equipment automation and product consistency.
Smart Images
Figure CN120645348A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of TPU recovery, in particular to a TPU film recovery and reuse device. Background Art
[0002] Existing TPU film recycling and reuse equipment primarily consists of single devices, such as a crusher, heater, and extruder. Operations between these devices require manual handling and adjustment. This decentralized equipment layout and operational process present several significant drawbacks. First, the need for manual coordination between the various devices complicates the overall production process and leads to low efficiency. Furthermore, the discontinuous nature of the transport between devices can lead to temperature unevenness during the crushing and heating of the TPU film, impacting the final melt quality, increasing the number of bubbles in the finished product, and reducing the quality of the finished product. Summary of the Invention
[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a TPU film recycling and reuse equipment, comprising a heating barrel, a stirring rod is provided at the axial position inside the heating barrel, the stirring rod is rotatably installed in the heating barrel through a stirring rod bracket, and a plurality of stirring blades are fixed on the stirring rod; an extrusion channel tube is fixedly connected to the bottom of the heating barrel, a bent pipe is fixedly connected to the bottom end of the extrusion channel tube, a discharge extrusion screw is rotatably provided on the inner wall of the extrusion channel tube, a coaxial cylindrical expansion hole is provided inside the discharge extrusion screw, a spline shaft is coaxially provided inside the discharge extrusion screw, and both ends of the spline shaft are axially slidably fitted with the stirring rod and the driving shaft in a spline manner; the spline shaft is fixedly provided with an engaging disk at the position of the cylindrical expansion hole, a tension spring is rotatably installed between the engaging disk and the upper end face of the cylindrical expansion hole, and a tooth shape that can engage with each other is provided between the lower end face of the cylindrical expansion hole and the opposite face of the engaging disk.
[0004] Preferably, the discharge extrusion screw is rotationally sealed with the stirring rod and the driving shaft; the tension spring and the upper end surface of the cylindrical expansion hole can only rotate but not move axially, and the engaging disk slides axially on the inner wall of the cylindrical expansion hole.
[0005] Preferably, a two-way funnel is fixed on the top of the heating barrel, a switch valve is provided at the closing portion in the middle of the two-way funnel, a separation chamber is fixedly connected to the two-way funnel, an axial exhaust pipe is fixed at the central axial position of the separation chamber, a gas turbine is rotatably arranged inside the axial exhaust pipe, and a plurality of through holes are provided on the circumferential surface of the axial exhaust pipe located inside the separation chamber.
[0006] Preferably, a crushing chamber is provided above the separation chamber, a feed port is provided at the top of the crushing chamber, a feed pipe is fixedly connected to the top position of the circumferential surface of the crushing chamber, the bottom end of the feed pipe is connected to the interior of the separation chamber, and the feed pipe is connected along the tangential direction of the inner wall of the separation chamber.
[0007] Preferably, a first gearbox is fixed to the bottom surface of the crushing chamber, an output shaft of the first gearbox extends to the interior of the crushing chamber, and a blade is fixed on the output shaft of the first gearbox.
[0008] Preferably, the crushing chamber, separation chamber and heating barrel are all fixed on the frame, and a vacuum pump is fixed on the frame. The air inlet of the vacuum pump is connected to the two-way funnel so that the air inlet of the vacuum pump is connected to the inside of the heating barrel, and a one-way valve is provided at the air inlet of the vacuum pump.
[0009] Preferably, a second gearbox is fixed to the bottom of the frame, and the output shaft of the second gearbox is connected to the driving shaft through a bottom transmission belt. A driving motor is fixed to the top of the frame, and the output shaft of the driving motor is fixedly matched with the input shaft of the second gearbox.
[0010] Preferably, the input shaft of the second gearbox or the output shaft of the drive motor is connected to the input shaft of the first gearbox via a top transmission belt, and the input shaft of the first gearbox is also fixedly connected to the gas turbine.
[0011] Preferably, a bottom discharge valve is provided at the bottom of the elbow.
[0012] Compared with the prior art, the present invention has the following advantages: (1) The present invention provides a stirring rod and a plurality of stirring blades in the heating barrel. The rotation of the stirring blades can not only uniformly heat the scrapped TPU film and improve its melting efficiency, but also effectively mix the melted TPU liquid to ensure uniform temperature distribution throughout the heating process. The stirring blades can eliminate some bubbles during rotation, making the final extruded TPU melt purer and avoiding molding quality problems caused by residual bubbles in subsequent processing; (2) The present invention uses high-speed rotating blades to suck TPU film fragments into the separation chamber and uses centrifugal force and gravity to separate the fragments from the air. The axial exhaust pipe discharges the air through the rotation of the turbine, and the separated air is filtered through the filter element to remove fine dust, ensuring the cleanliness of the system; (3) The present invention pumps the interior of the heating barrel into a negative pressure state, and uses the pressure difference to automatically separate the bubbles in the melt, thereby improving the quality of the final product. This design makes the entire degassing process more efficient, reduces the number of manual intervention steps, and improves production efficiency and product consistency. (4) By integrating functional modules such as the crushing chamber, separation chamber, heating barrel, and vacuum system into one device, the present invention realizes an integrated processing flow of TPU film from crushing, heating and melting to discharge. The integrated design not only reduces the equipment footprint, but also shortens the production process time, greatly improving overall production efficiency. At the same time, the equipment has a higher degree of automation and is easy to operate, reducing the complexity and error rate of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0014] Figure 2 This is a structural schematic diagram of the bottom discharge valve of the present invention.
[0015] Figure 3 Schematic diagram of the separation chamber structure of the present invention.
[0016] Figure 4 This is a structural diagram of the discharge extrusion screw of the present invention.
[0017] Figure 5 It is a schematic diagram of the cylindrical hole expansion structure of the present invention.
[0018] In the figure: 101-heating barrel; 102-stirring rod bracket; 103-stirring rod; 104-stirring blade; 105-bidirectional funnel; 106-switch valve; 107-extrusion channel tube; 108-discharge extrusion screw; 109-driving shaft; 110-elbow; 111-spline shaft; 112-engaging disk; 113-tension spring; 114-cylindrical expansion hole; 115-axial exhaust pipe; 116-turbine; 117-first gearbox; 118-blade; 119-crushing chamber; 120-feeding port; 121-feeding pipe; 122-separation chamber; 123-top transmission belt; 124-second gearbox; 125-bottom discharge valve; 126-bottom transmission belt; 127-driving motor; 128-vacuum pump; 129-frame. DETAILED DESCRIPTION
[0019] The following is combined with Figure 1-5 , and further illustrate the technical solution of the present invention through specific implementation methods.
[0020] The present invention provides a TPU film recycling and reuse device, comprising a heating barrel 101, wherein a stirring rod 103 is provided at an axial position inside the heating barrel 101, the stirring rod 103 is rotatably mounted in the heating barrel 101 through a stirring rod bracket 102, and a plurality of stirring blades 104 are fixed on the stirring rod 103; an extrusion channel tube 107 is fixedly connected to the bottom of the heating barrel 101, a bent tube 110 is fixedly connected to the bottom end of the extrusion channel tube 107, and a discharge extrusion screw 108 is rotatably provided on the inner wall of the extrusion channel tube 107, and the discharge extrusion screw 108 is rotatably mounted on the inner wall of the extrusion channel tube 107. A coaxial cylindrical counterbore 114 is provided inside 108, and a spline shaft 111 is coaxially provided inside the discharge extrusion screw 108. Both ends of the spline shaft 111 are splined to slide axially with the stirring rod 103 and the drive shaft 109. The spline shaft 111 is fixedly provided with an engaging disc 112 at the position of the cylindrical counterbore 114. A tension spring 113 is rotatably mounted between the engaging disc 112 and the upper end surface of the cylindrical counterbore 114. A toothed profile that can mesh with each other is provided between the lower end surface of the cylindrical counterbore 114 and the opposing surface of the engaging disc 112. The discharge extrusion screw 108 is in a rotationally sealed engagement with the stirring rod 103 and the drive shaft 109. The tension spring 113 and the upper end surface of the cylindrical counterbore 114 can only rotate and cannot move axially, and the engaging disc 112 slides axially on the inner wall of the cylindrical counterbore 114. A two-way funnel 105 is fixed to the top of the heating barrel 101. A switch valve 106 is provided at the middle end of the two-way funnel 105. A separation chamber 122 is fixedly connected to the two-way funnel 105. An axial exhaust pipe 115 is fixed to the central axis of the separation chamber 122. A turbine 116 is rotatably installed inside the axial exhaust pipe 115. A plurality of through holes are provided on the circumferential surface of the axial exhaust pipe 115 located inside the separation chamber 122. A crushing chamber 119 is provided above the separation chamber 122. A feed port 120 is provided at the top of the crushing chamber 119. A feed pipe 121 is fixedly connected to the top of the circumferential surface of the crushing chamber 119. The bottom end of the feed pipe 121 is connected to the interior of the separation chamber 122 and is connected and matched along the tangent direction of the inner wall of the separation chamber 122. A first gearbox 117 is fixed to the bottom of the crushing chamber 119. The output shaft of the first gearbox 117 extends into the crushing chamber 119, and a blade 118 is fixed to the output shaft of the first gearbox 117. The crushing chamber 119, the separation chamber 122, and the heating barrel 101 are all fixed to a frame 129. A vacuum pump 128 is fixed to the frame 129. The air inlet of the vacuum pump 128 is connected to the two-way funnel 105, so that the air inlet of the vacuum pump 128 is in communication with the interior of the heating barrel 101. A one-way valve is also installed at the air inlet of the vacuum pump 128. A second gearbox 124 is also fixed to the bottom of the frame 129. The output shaft of the second gearbox 124 is connected to the drive shaft 109 via a bottom transmission belt 126. A drive motor 127 is fixed to the top of the frame 129. The output shaft of the drive motor 127 is fixedly mated with the input shaft of the second gearbox 124.The input shaft of the second gearbox 124 or the output shaft of the drive motor 127 is connected to the input shaft of the first gearbox 117 via a top transmission belt 123. The input shaft of the first gearbox 117 is also fixedly connected to the gas turbine 116. A bottom discharge valve 125 is provided at the bottom of the elbow 110.
[0021] The working principle of the TPU film recycling and reuse equipment disclosed in the present invention is as follows: the scrapped TPU film is fed into the crushing chamber 119 through the feed port 120, and then broken into pieces by the high-speed rotating blade 118. The rotation of the blade 118 requires starting the drive motor 127. The rotation of the output shaft of the drive motor 127 will drive the input shaft of the first gearbox 117 to rotate through the top transmission belt 123, and the output shaft of the first gearbox 117 will drive the blade 118 to rotate. The input shaft of the first gearbox 117 also drives the turbine 116 to rotate. The rotation of the turbine 116 discharges the air inside the separation chamber 122. Since the separation chamber 122 is connected to the crushing chamber 119 through the feed pipe 121, the crushing chamber 119 is in a low-pressure state at this time. The broken TPU film will be sucked into the feed pipe 121 under the drive of the air flow and the action of centrifugal force (therefore, only TPU film fragments with smaller diameters will be sucked in, realizing the function of preliminary filtration and ensuring the heating efficiency of the TPU film in the heating barrel 101), and then enter the separation chamber 122 along the tangent direction of the inner wall of the separation chamber 122, and rotate on the inner wall of the separation chamber 122. Due to the rotation, the broken TPU film will be separated from the air, and the air will be discharged to the outside of the separation chamber 122 through the axial exhaust pipe 115 ( An air filter can be set at the exhaust position at the top of the axial exhaust pipe 115 to filter out fine dust. The broken TPU film entering the separation chamber 122 slides along the two-way funnel 105 into the heating barrel 101 under the action of gravity (the switch valve 106 is in the open state at this time), and then the temperature of the heating barrel 101 is increased (heating wires are embedded in the inner wall of the heating barrel 101 and the stirring blade 104). The high temperature melts the broken TPU film and turns it into liquid. At this time, there will be bubbles in the melted TPU liquid, which need to be eliminated before discharge. Some bubbles can be eliminated by the rotating stirring blade 104. The rotation of the stirring blade 104 can not only heat the broken TPU film more evenly and improve its melting efficiency, but also mix and stir it. The power for the rotation of the stirring blades 104 comes from the second gearbox 124. Specifically, the output shaft of the drive motor 127 will also drive the input shaft of the second gearbox 124 to rotate. The output shaft of the second gearbox 124 drives the driving shaft 109 to rotate through the bottom transmission belt 126. The driving shaft 109 drives the stirring rod 103 to rotate through the spline shaft 111. At this time, all the stirring blades 104 on the stirring rod 103 will rotate.
[0022] Start the vacuum pump 128, which will pump the inside of the heating barrel 101 into a negative pressure, and close the switch valve 106 in advance. Under low pressure, the bubbles in the TPU melt will be automatically separated from it under the action of the pressure difference. Finally, start the electromagnet inside the drive shaft 109 (the drive shaft 109 is embedded with an electromagnet), and the magnetic force will attract the meshing disk 112 to move downward, thereby driving the spline shaft 111 to move downward. At this time, relative sliding occurs between the spline shaft 111, the stirring rod 103 and the drive shaft 109, and the tension spring 113 is stretched. At this time, the meshing disk 112 is engaged with the bottom end face of the cylindrical expansion hole 114. Due to the rotation state of the drive shaft 109 (the drive shaft 109 and the elbow 110 are in a rotating seal), the spline shaft 111 is also rotating. The cylindrical counterbore 114 is a part of the discharge extrusion screw 108, so the discharge extrusion screw 108 will rotate. The rotation of the discharge extrusion screw 108 will discharge the TPU melt inside the heating barrel 101. At this time, the switch valve 106 and the bottom discharge valve 125 can be opened. Under the extrusion of the discharge extrusion screw 108, the melted TPU will be squeezed out from the bottom discharge valve 125 and fall into the cooling water for cooling and shaping.
Claims
1. A TPU film recycling and reuse device, characterized by: The heating barrel (101) comprises a stirring rod (103) provided at an axial position inside the heating barrel (101). The stirring rod (103) is rotatably mounted in the heating barrel (101) via a stirring rod bracket (102). A plurality of stirring blades (104) are also fixed on the stirring rod (103). The bottom of the heating barrel (101) is fixedly connected to an extrusion channel tube (107), the bottom end of the extrusion channel tube (107) is fixedly connected to a bend tube (110), the inner wall of the extrusion channel tube (107) is rotatably provided with a discharge extrusion screw (108), a coaxially matched cylindrical expansion hole (114) is provided inside the discharge extrusion screw (108), a spline shaft (111) is coaxially provided inside the discharge extrusion screw (108), and both ends of the spline shaft (111) are axially slidably matched with the stirring rod (103) and the driving shaft (109) in a spline manner; The spline shaft (111) is fixedly provided with an engaging disk (112) at a position where the cylindrical expansion hole (114) is located. A tension spring (113) is rotatably installed between the engaging disk (112) and the upper end surface of the cylindrical expansion hole (114). A tooth shape capable of engaging with each other is provided between the lower end surface of the cylindrical expansion hole (114) and the opposite surface of the engaging disk (112).
2. The TPU film recycling equipment according to claim 1, characterized in that: The discharge extrusion screw (108) is in rotational sealing cooperation with the stirring rod (103) and the driving shaft (109); the tension spring (113) and the upper end surface of the cylindrical expansion hole (114) can only rotate but cannot move axially, and the meshing disk (112) slides axially on the inner wall of the cylindrical expansion hole (114).
3. The TPU film recycling equipment according to claim 2, characterized in that: A two-way funnel (105) is fixed on the top of the heating barrel (101), and a switch valve (106) is provided at the middle end of the two-way funnel (105). A separation chamber (122) is fixedly connected to the two-way funnel (105), and an axial exhaust pipe (115) is fixed at the central axis position of the separation chamber (122). A turbine (116) is rotatably arranged inside the axial exhaust pipe (115), and a plurality of through holes are provided on the circumferential surface of the axial exhaust pipe (115) at a position inside the separation chamber (122).
4. The TPU film recycling equipment according to claim 3, characterized in that: A crushing chamber (119) is provided above the separation chamber (122), a feed port (120) is provided at the top of the crushing chamber (119), a feed pipe (121) is fixedly connected to the top position of the circumferential surface of the crushing chamber (119), the bottom end of the feed pipe (121) is connected to the interior of the separation chamber (122), and the feed pipe (121) is connected along the tangential direction of the inner wall of the separation chamber (122).
5. The TPU film recycling equipment according to claim 4, characterized in that: A first gearbox (117) is fixed to the bottom surface of the pulverizing chamber (119), an output shaft of the first gearbox (117) extends into the interior of the pulverizing chamber (119), and a blade (118) is fixed to the output shaft of the first gearbox (117).
6. The TPU film recycling equipment according to claim 5, characterized in that: The crushing chamber (119), the separation chamber (122) and the heating barrel (101) are all fixed on the frame (129). A vacuum pump (128) is fixed on the frame (129). The air inlet of the vacuum pump (128) is connected to the two-way funnel (105), so that the air inlet of the vacuum pump (128) is communicated with the interior of the heating barrel (101), and a one-way valve is provided at the air inlet of the vacuum pump (128).
7. The TPU film recycling equipment according to claim 6, characterized in that: A second gearbox (124) is also fixed to the bottom of the frame (129), and the output shaft of the second gearbox (124) is connected to the driving shaft (109) via a bottom transmission belt (126). A driving motor (127) is fixed to the top of the frame (129), and the output shaft of the driving motor (127) is fixedly matched with the input shaft of the second gearbox (124).
8. The TPU film recycling equipment according to claim 7, characterized in that: The input shaft of the second gearbox (124) or the output shaft of the drive motor (127) is connected to the input shaft of the first gearbox (117) via a top transmission belt (123). The input shaft of the first gearbox (117) is also fixedly connected to the gas turbine (116).
9. The TPU film recycling equipment according to claim 8, characterized in that: The bottom of the elbow (110) is provided with a bottom discharge valve (125).