Plastic recycling device and recycling process

Abstract

The application relates to the technical field of plastic processing equipment, in particular to plastic recycling equipment and a recycling process. The plastic recycling equipment comprises a banbury mixer, a rotor, a dynamic ring and a static ring installed on the rotor, the static ring and the dynamic ring are coaxial with the rotor and are rotationally connected to form an end face sealing mechanism. The banbury mixer is provided with a cylinder seat, a push ring and a yoke mechanism; the cylinder seat is slidably sleeved on the rotor and connected with the static ring, an annular groove coaxial with the static ring is formed in one end of the cylinder seat away from the static ring, and the push ring is slidably arranged in the annular groove and forms a closed cavity together with the bottom wall of the annular groove. The cavity is filled with cooling liquid. According to the principle that the liquid static pressure is equal everywhere, the local thrust exerted on the push ring by the yoke mechanism is uniformly converted into hydraulic pressure acting on the bottom wall of the annular groove, and then the hydraulic pressure is uniformly transmitted to the static ring through the cylinder seat, so that the static ring end face is balanced at all places, the sealing failure caused by local partial load is effectively avoided, and the sealing effect between the static ring and the dynamic ring is improved.

Description

Technical Field

[0001] This invention relates to the field of plastic processing equipment technology, and in particular to a plastic recycling equipment and recycling process. Background Technology

[0002] With the continuous increase in plastic waste emissions, plastic recycling has become an important measure to practice the concept of green development and conserve resources. The performance of plastic recycling equipment directly determines the quality and efficiency of recycled plastics. In the plastic recycling process, the internal mixer is one of the most widely used core equipment, mainly used for melting, mixing and plasticizing plastic waste. The end-face sealing structure, as a key component of the internal mixer, directly affects the sealing performance and operational stability of the equipment.

[0003] Currently, the end face sealing method of internal mixers used for plastic recycling mostly adopts the fork-type hydraulic seal. This sealing method has a simple structure and low cost, and is particularly widely used in small internal mixers. Objectively speaking, the fork-type hydraulic seal can achieve basic sealing functions and ensure the normal operation of the internal mixer. However, it has significant technical defects in practical applications, which seriously affect the service life of the internal mixer and the plastic recycling effect.

[0004] The core defects are mainly reflected in two aspects: First, the existing shift fork structure only has two points of action at the dynamic and static seals, resulting in poor uniformity of force and imbalance of force on the dynamic and static sealing surfaces. This directly affects the end face sealing effect, easily leads to sealing leakage, and exacerbates the leakage of hot materials and dust intrusion. Second, during the operation of small internal mixers, the sealing surface is prone to excessive friction and temperature rise due to local leakage, sudden changes in axial force, etc. The cooling effect of existing lubricants is limited by the flow rate and has an upper limit, which cannot reduce the temperature of the sealing surface in time. This easily leads to overheating and damage to the sealing surface, further aggravating the sealing failure. Summary of the Invention

[0005] Therefore, it is necessary to provide a plastic recycling equipment and recycling process to address the problem of poor end-face sealing effect of current internal mixers.

[0006] The above objectives are achieved through the following technical solutions: A plastic recycling device includes an internal mixer with a mixing chamber. The internal mixer has a rotor penetrating the mixing chamber and a rotating ring and a stationary ring mounted on the rotor. Both the stationary and rotating rings are coaxial with the rotor and rotatably connected to form an end-face sealing mechanism. The internal mixer also includes a pressure equalization mechanism and a shifting fork mechanism. The pressure equalization mechanism includes a cylinder seat, a push ring, a separating assembly, and a turbulence-inducing assembly. The cylinder seat is slidably fitted onto the rotor and connected to the end of the stationary ring furthest from the rotating ring. An annular groove, coaxial with the stationary ring, is formed at the end of the cylinder seat furthest from the stationary ring. The push ring is fitted into the annular groove and slidably disposed within the groove along the rotor axial direction. The bottom wall of the annular groove is parallel to the end face of the stationary ring. The push ring and the bottom wall of the annular groove together form a sealed space. The cavity is filled with coolant; a partition assembly is used to divide the cavity into a first cavity and a second cavity, and can maintain communication between the first cavity and the second cavity when the coolant temperature in the first cavity is lower than a set value, and cut off the communication between the first cavity and the second cavity when the temperature rises to the set value, so that the coolant in the first cavity remains static; the coolant in the second cavity can exchange heat with the outside; when the push ring approaches the stationary ring, it can squeeze the first cavity, so that the coolant in the first cavity forms pressure and acts evenly on the bottom wall of the ring groove; the turbulence assembly is used to promote the flow of coolant in the second cavity when the first cavity and the second cavity are isolated from each other; the shift fork mechanism is used to apply a thrust to the push ring in the axial direction of the stationary ring.

[0007] Preferably, the partition assembly includes a partition cylinder, a rotating cylinder, and a detection element. The partition cylinder is disposed within the cavity and has protruding rings extending radially at both ends. The partition cylinder is coaxial with the ring groove and connected to the cylinder seat through the protruding rings. The partition cylinder is located between the first cavity and the second cavity. A through hole is provided on the circumferential surface of the partition cylinder, and the first cavity and the second cavity are connected through the through hole. The rotating cylinder is rotatably disposed on the partition cylinder and located within the first cavity. A through groove is provided on the rotating cylinder. The rotation of the rotating cylinder can cause the through groove and the through hole to coincide radially or be offset circumferentially, thereby connecting or isolating the first cavity and the second cavity. The detection element is used to monitor the temperature of the coolant in the first cavity and control the rotation of the rotating cylinder according to the temperature.

[0008] Preferably, the detection element is a bimetallic strip, with its two ends connected to the rotating drum and the partition drum, respectively, and when the bimetallic strip deforms due to temperature, it bends and deforms along the rotor axis.

[0009] Preferably, the turbulence-disrupting component includes a retaining ring, springs, and a positioning block. The retaining ring is sleeved on the partition cylinder and slidably connected to the partition cylinder. Multiple springs are provided, which are evenly arranged along the circumference of the retaining ring and their two ends are respectively connected to the retaining ring and the convex ring. A positioning groove and a sliding groove are provided on the side of the rotating cylinder near the retaining ring, and the positioning groove and the sliding groove are connected. The positioning block is provided on the side of the retaining ring near the rotating cylinder and passes through the through hole on the partition cylinder and is slidably connected to the rotating cylinder. When the first cavity and the second cavity are separated, the positioning block slides in the sliding groove along the axial direction of the rotating cylinder. When the first cavity and the second cavity are connected, the positioning block slides in the positioning groove along the circumference of the rotating cylinder.

[0010] Preferably, a plurality of cold tubes are provided on the outer circumferential surface of the cylinder base, the plurality of cold tubes are arranged along the circumference of the cylinder base and both ends of the cold tubes are connected to the second cavity; the retaining ring is located between the two ends of the cold tubes.

[0011] Preferably, the retaining ring is slidably connected to the partition cylinder and the cylinder seat respectively. The retaining ring has a flow channel that passes through the retaining ring along the axial direction of the retaining ring. One end of the retaining ring is provided with a lever, which is inclined and one side of it is connected to the retaining ring. The retaining ring can slide in one direction to make the lever move closer to the retaining ring and block the flow channel.

[0012] Preferably, the cylinder base, rotating cylinder, partition cylinder, and retaining ring all adopt a split structure, divided into left and right parts along the plane where their respective axes are located.

[0013] Preferably, a guide plate is provided on the inner circumferential surface of the rotating drum. The guide plate is inclined along the circumference of the rotating drum to guide the coolant in the first cavity to flow along the rotor axis.

[0014] Preferably, the shift fork mechanism includes a stud, a shift fork plate, and a power component. The shift fork plate is mounted on the internal mixer and located at the end of the drum seat away from the stationary ring in the axial direction. The shift fork plate is provided with two push rods located on both sides of the rotor in the radial direction. The power component is mounted on the shift fork plate and is used to control the shift fork plate to move along the rotor axial direction. The stud is mounted on the internal mixer and abuts against the shift fork plate in the rotor axial direction. The stud is located between the push rods and the power component. The stud acts as a fulcrum to drive the shift fork plate to rotate around it, thereby enabling the push rods to apply a thrust to the push ring.

[0015] A plastic recycling process includes the following steps: S1. Add raw materials to the mixing chamber.

[0016] S2. The rotor rotates to process the raw materials in the mixing chamber; the moving ring rotates relative to the stationary ring and seals the mixing chamber by engaging with the stationary ring through its end face; the shift fork mechanism applies uniform pressure to the end face of the stationary ring through the pressure equalization mechanism.

[0017] S3. After the raw materials are processed, they are discharged from the mixing chamber.

[0018] The beneficial effects of this invention are as follows: by setting up a cylinder seat, a push ring, and a sealed cavity, and filling the cavity with coolant, the local thrust applied to the push ring by the shift fork mechanism is uniformly converted into hydraulic pressure acting on the bottom wall of the ring groove by utilizing the principle that the static pressure of the liquid is equal everywhere. This pressure is then uniformly transmitted to the stationary ring through the cylinder seat, so that the force on the end face of the stationary ring is balanced, effectively avoiding sealing failure caused by local uneven load, and significantly improving the sealing effect between the stationary ring and the moving ring.

[0019] When the coolant temperature in the first chamber rises to a set value, the separating component cuts off the connection between the first and second chambers. Simultaneously, the turbulence-promoting component facilitates the flow of coolant in the second chamber, maintaining a uniform coolant temperature and enhancing heat exchange between the second chamber and the external environment. Effective heat dissipation from the second chamber lowers the temperature in the first chamber. Thus, while maintaining a static state, the coolant in the first chamber can still achieve effective cooling through heat conduction, thereby reducing the temperature generated by friction between the stationary and rotating rings, minimizing frictional wear, stabilizing the operating conditions of the stationary and rotating rings, and ensuring sealing performance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal mixer of a plastic recycling equipment provided in an embodiment of the present invention; Figure 2 A right view of a mixer in a plastic recycling device provided in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view along the middle AA direction; Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 for Figure 4 Enlarged view in C++; Figure 6 This is a schematic diagram of the pressure equalization mechanism of a plastic recycling device provided in an embodiment of the present invention; Figure 7 for Figure 6 Enlarged view at point D; Figure 8 This is a schematic diagram of the structure of half of a cylinder base of a plastic recycling device provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of half a retaining ring of a plastic recycling device provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of half of a rotating drum in a plastic recycling device provided in an embodiment of the present invention.

[0021] in: 100. Internal mixer; 101. Internal mixing chamber; 102. Rotor; 103. Moving ring; 104. Stationary ring; 105. Barrel base; 106. Push ring; 110. First chamber; 111. Second chamber; 112. Partition cylinder; 113. Rotating drum; 114. Bimetallic strip; 115. Convex ring; 116. Through hole; 117. Through groove; 118. Locking block; 119. Locking groove; 120. Retaining ring; 121. Spring; 122. Positioning block; 123. Positioning groove; 124. Slide groove; 125. Guide rod; 126. Cooling pipe; 127. Flow channel; 128. Paddle; 129. Guide plate; 130. Stud; 131. Paddle fork plate; 132. Power component; 133. Top ring; 134. Sealing cover; 135. Connecting rod; 136. Sealing plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" of the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] like Figures 1 to 10As shown, this embodiment of the invention provides a plastic recycling device, including a mixer 100, an upper plug, and a lower plug. The mixer 100 has a mixing chamber 101, a rotor 102 penetrating the mixing chamber 101, and a rotating ring 103 and a stationary ring 104 mounted on the rotor 102. The stationary ring 104 and the rotating ring 103 are coaxial with the rotor 102 and rotatably connected to form an end-face sealing mechanism. The mixer 100 also has an upper plug for pressurizing the raw materials in the mixing chamber 101, and... The lower plug is used to seal the mixing chamber 101; the mixing mill 100 is equipped with a pressure equalization mechanism and a shift fork mechanism. The pressure equalization mechanism includes a barrel seat 105, a push ring 106, a partition assembly, and a turbulence evacuation assembly. The barrel seat 105 is slidably sleeved on the rotor 102 and connected to the end of the stationary ring 104 away from the moving ring 103. The end of the barrel seat 105 away from the stationary ring 104 has an annular groove coaxial with the stationary ring 104. The push ring 106 is sleeved in the annular groove and slidably disposed in the annular groove along the axial direction of the rotor 102. The bottom wall of the annular groove is flush with the stationary ring 103. The end faces of 4 are parallel, and the push ring 106 and the bottom wall of the annular groove form a sealed cavity filled with coolant. The partition assembly is used to divide the cavity into a first cavity 110 and a second cavity 111, and can maintain communication between the first cavity 110 and the second cavity 111 when the coolant temperature in the first cavity 110 is lower than a set value, and cut off the communication between the first cavity 110 and the second cavity 111 when the temperature rises to the set value, so that the coolant in the first cavity 110 remains static. The coolant in the second cavity 111 can be exposed to external coolant. The partition is made of thermally conductive material to facilitate heat exchange between the first cavity 110 and the second cavity 111. When the push ring 106 approaches the stationary ring 104, it can squeeze the first cavity 110, causing the coolant in the first cavity 110 to form pressure and act evenly on the bottom wall of the ring groove. The turbulence assembly is used to promote the flow of coolant in the second cavity 111 when the first cavity 110 and the second cavity 111 are isolated from each other. The shift fork mechanism is used to apply a thrust to the push ring 106 in the axial direction of the stationary ring 104.

[0026] By setting up a cylinder seat 105, a push ring 106, and a sealed cavity, and filling the cavity with coolant, the local thrust applied to the push ring 106 by the shift fork mechanism is uniformly converted into hydraulic pressure acting on the bottom wall of the ring groove by utilizing the principle that the static pressure of the liquid is equal everywhere. This pressure is then uniformly transmitted to the stationary ring 104 through the cylinder seat 105, so that the force on the end face of the stationary ring 104 is balanced, effectively avoiding sealing failure caused by local uneven load, and greatly improving the sealing effect between the stationary ring 104 and the moving ring 103.

[0027] When the coolant temperature in the first chamber 110 rises to a set value, the separator component cuts off the connection between the first chamber 110 and the second chamber 111. Simultaneously, the flow-promoting component promotes the flow of coolant in the second chamber 111, maintaining a uniform coolant temperature and enhancing heat exchange between the second chamber 111 and the outside environment. At the same time, the separator component itself has heat conduction capabilities, allowing heat from the first chamber 110 to be conducted to the second chamber 111 and then dissipated. Thus, while maintaining a static state, the coolant in the first chamber 110 can still achieve effective cooling through heat conduction, thereby reducing the temperature generated by friction between the stationary ring 104 and the rotating ring 103, reducing frictional wear, stabilizing the working conditions of the stationary ring 104 and the rotating ring 103, and ensuring long-term sealing performance.

[0028] In this embodiment, the partition assembly includes a partition cylinder 112, a rotating cylinder 113, and a detection element. The partition cylinder 112 is disposed in the cavity and has protruding rings 115 extending radially at both ends. The partition cylinder 112 is coaxial with the ring groove and connected to the cylinder seat 105 through the protruding rings 115. The partition cylinder 112 is located between the first cavity 110 and the second cavity 111. A through hole 116 is provided on the circumferential surface of the partition cylinder 112, and the first cavity 110 and the second cavity 111 are connected through the through hole 116. The rotating cylinder 113 is rotatably disposed on the partition cylinder 112 and located in the first cavity 110. A through groove 117 is provided on the rotating cylinder 113. The rotation of the rotating cylinder 113 can cause the through groove 117 and the through hole 116 to coincide radially or be offset circumferentially, thereby connecting or separating the first cavity 110 and the second cavity 111. The detection element is used to monitor the temperature of the coolant in the first cavity 110 and control the rotation of the rotating cylinder 113 according to the temperature.

[0029] Specifically, the protruding ring 115 on the partition cylinder 112 is located on the outer wall of the annular groove, and the contact area between the second cavity 111 and the cylinder seat 105 is larger, resulting in better heat dissipation. Multiple through holes 116 and through slots 117 are provided. The multiple through holes 116 are evenly arranged along the circumference of the partition cylinder 112, and the multiple through slots 117 are divided into multiple groups of two. The two through slots 117 in the same group are arranged along the axial direction of the rotating cylinder 113 with a gap between them. Each group of through slots 117 corresponds one-to-one with a single through hole 116.

[0030] Both end faces of the rotating drum 113 are provided with stops. The two stops are located at both ends of the drum base 105 and are slidably connected to the drum base 105 to limit the relative axial position of the rotating drum 113 and the drum base 105. After the detection element controls the rotation of the rotating drum 113, each set of through slots 117 can move closer to or further away from the corresponding through hole 116 until they completely overlap or completely separate.

[0031] In this embodiment, the detection element is a bimetallic strip 114. The two ends of the bimetallic strip 114 are connected to the rotating drum 113 and the partition drum 112 respectively. When the bimetallic strip 114 is deformed due to temperature, it bends and deforms along the axial direction of the rotor 102.

[0032] Specifically, the bimetallic strip 114 employs a temperature-controlled deformation component from existing technology, capable of bending and deforming according to its material properties after the ambient temperature reaches a preset value. Under normal conditions, the bimetallic strip 114 is parallel to the end face of the rotating cylinder 113, and each set of through slots 117 completely overlaps with the corresponding through holes 116, with the first cavity 110 and the second cavity 111 connected. If the coolant temperature in the first cavity 110 rises to a preset value, the bimetallic strip 114 bends, bringing its two ends closer together, thereby causing the rotating cylinder 113 to rotate and separating the first cavity 110 and the second cavity 111.

[0033] In this embodiment, the turbulence-disrupting assembly includes a retaining ring 120, a spring 121, and a positioning block 122. The retaining ring 120 is sleeved on the partition cylinder 112 and slidably connected to the partition cylinder 112. Multiple springs 121 are provided, and the multiple springs 121 are evenly arranged around the retaining ring 120, with their two ends respectively connected to the retaining ring 120 and the convex ring 115. The rotating cylinder 113 has a positioning groove 123 and a sliding groove 124 on the side near the retaining ring 120, and the positioning groove 123 and the sliding groove 124 are connected. The positioning block 122 is disposed on the side of the retaining ring 120 near the rotating cylinder 113 and passes through the through hole 116 on the partition cylinder 112 and is slidably connected to the rotating cylinder 113. When the first cavity 110 and the second cavity 111 are separated, the positioning block 122 slides axially in the sliding groove 124 along the rotating cylinder 113. When the first cavity 110 and the second cavity 111 are connected, the positioning block 122 slides circumferentially in the positioning groove 123 along the rotating cylinder 113.

[0034] Specifically, the convex ring 115 is provided with multiple guide rods 125, which are evenly arranged circumferentially along the partition cylinder 112 and extend axially along the partition cylinder 112. Each guide rod 125 passes through the retaining ring 120 and is slidably connected to the retaining ring 120. Multiple springs 121 are arranged in pairs, and multiple groups of springs 121 are arranged circumferentially along the retaining ring 120. The two springs 121 in the same group are located on both sides of the retaining ring 120 axially and are sleeved on the same guide rod 125.

[0035] In the prior art, when the rubber compound is pushed by the helical protrusions on the surface of the rotor 102 of the internal mixer 100, the rubber compound generates a reverse axial force on the rotor 102. Since the rotor 102 usually has long / short protrusions with opposite directions of rotation and unequal lengths (e.g., the helix angle of the long helical section is about 30°, and that of the short helical section is about 45°), the rubber compound moves back and forth axially during mixing, and the axial force on the rotor 102 also changes direction periodically. This causes the internal mixer 100 to vibrate along the axial direction of the rotor 102. This vibration serves as the power to drive the axial swaying of the drum 105, causing the partition cylinder 112 to sway accordingly. At the same time, the partition cylinder 112 drives the retaining ring 120 to move through the spring 121. Due to the inertia of the retaining ring 120, the spring 121 is stretched or compressed, and the retaining ring 120 slides relative to the partition cylinder 112, thereby agitating the coolant in the second chamber 111 and improving the heat dissipation efficiency.

[0036] In this embodiment, a plurality of cold tubes 126 are provided on the outer peripheral surface of the cylindrical base 105. The plurality of cold tubes 126 are arranged along the circumference of the cylindrical base 105 and both ends of the tubes are connected to the second cavity 111. The retaining ring 120 is located between the two ends of the cold tubes 126.

[0037] Specifically, the cylindrical base 105, as the core load-bearing component for transmitting axial force, is typically made of high-strength alloy steel or other materials with excellent load-bearing properties to ensure sufficient structural strength and rigidity. However, these materials generally have low thermal conductivity and insufficient heat dissipation efficiency. By installing a cooling pipe 126 on the outside of the cylindrical base 105 that communicates with the second cavity 111, the defects of low thermal conductivity and poor heat dissipation of the high-strength load-bearing material are compensated, thus achieving effective heat dissipation for the cylindrical base 105 and the internal coolant.

[0038] The reciprocating sliding of the retaining ring 120 within the second cavity 111 allows the coolant within the second cavity 111 to actively flow into the cold pipe 126, enhancing the heat dissipation effect.

[0039] In this embodiment, the retaining ring 120 is slidably connected to the partition cylinder 112 and the cylinder seat 105 respectively. The retaining ring 120 has a flow channel 127 that extends through the retaining ring 120 along its axial direction. One end of the retaining ring 120 is provided with a lever 128, which is inclined and has one side connected to the retaining ring 120. The retaining ring 120 can slide in one direction to make the lever 128 move closer to the retaining ring 120 and block the flow channel 127.

[0040] Specifically, multiple flow channels 127 and paddles 128 are provided, with each paddle 128 corresponding to one flow channel 127. The multiple flow channels 127 are evenly arranged along the circumference of the cylinder seat 105. The paddles 128 are flexible and can approach or move away from the corresponding flow channel 127 under the impact of the coolant in the second cavity 111, so that the flow channel 127 is blocked or opened, thereby causing the coolant in the second cavity 111 to flow unidirectionally and circulate through the cold pipe 126, improving the uniformity of coolant heat dissipation.

[0041] In this embodiment, the cylinder base 105, rotating cylinder 113, partition cylinder 112, and retaining ring 120 all adopt a split structure, divided into left and right parts along the plane containing their respective axes. The half-part mechanism is as follows: Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, this facilitates assembly, maintenance, and repair.

[0042] Specifically, each of the partition cylinders 112 has a locking block 118 at its mating surface, and each of the cylinder seats 105 has a locking groove 119 at its mating surface. When the partition cylinder 112 is installed on the cylinder seat 105, the locking block 118 on the partition cylinder 112 is located in the locking groove 119 on the cylinder seat 105 to prevent the partition cylinder 112 from rotating.

[0043] The internal mixer 100 is equipped with a sealing cover 134, which is sleeved on the rotor 102. The outer circumferential surface of the stationary ring 104 contacts the sealing cover 134 and the contact position is sealed. The rotating ring 103 is rotatably connected to the sealing cover 134.

[0044] In this embodiment, a guide plate 129 is provided on the inner circumferential surface of the rotating drum 113. The guide plate 129 is inclined along the circumference of the rotating drum 113 to guide the coolant in the first cavity 110 to flow along the axial direction of the rotor 102.

[0045] Specifically, multiple guide plates 129 are provided, each guide plate 129 is located between two adjacent sets of through slots 117. During the process of connecting and disconnecting the first cavity 110 and the second cavity 111, the rotating cylinder 113 will rotate under the action of the bimetallic strip 114. The rotation of the rotating cylinder 113 allows for a brief flow exchange between the coolant near the stationary ring 104 and the coolant away from the stationary ring 104 in the first cavity 110, promoting the uniformity of the coolant in the first cavity 110, optimizing the heat dissipation efficiency, and preventing the coolant in the first cavity 110 from deteriorating locally and affecting its overall heat dissipation effect.

[0046] In this embodiment, the shift fork mechanism includes a stud 130, a shift fork plate 131, and a power component 132. The shift fork plate 131 is disposed on the internal mixer 100 and located at the end of the cylinder seat 105 axially away from the stationary ring 104. The shift fork plate 131 is provided with two push rods, which are located on both sides of the rotor 102 in the radial direction. The power component 132 is disposed on the shift fork plate 131 and is used to control the shift fork plate 131 to move axially along the rotor 102. The stud 130 is disposed on the internal mixer 100 and abuts against the shift fork plate 131 axially with the rotor 102. The stud 130 is located between the push rods and the power component 132. The stud 130 acts as a fulcrum to drive the shift fork plate 131 to rotate around it, thereby enabling the push rods to apply a thrust to the push ring 106.

[0047] Specifically, the cylinder seat 105 is provided with a sealing plate 136 for sealing the annular groove. The sealing plate 136 is threadedly connected to the cylinder seat 105. The push ring 106 is provided with a connecting rod 135 at the end away from the stationary ring 104. The connecting rod 135 passes through the sealing plate 136 and extends out of the annular groove. The connecting rod 135 is slidably connected to the sealing plate 136. A top ring 133 is provided on the part of the connecting rod 135 located outside the annular groove. The top rod abuts against the top ring 133.

[0048] When the power component 132 controls the movement of the shift fork plate 131, the shift fork plate 131 rotates around the stud 130 under the support of the stud 130. The rotation direction of the side of the shift fork plate 131 with the push rod is opposite to the rotation direction of the side closer to the power component 132. The push rod on the shift fork plate 131 acts on the top ring 133, thereby changing the thrust of the cylinder seat 105 on the stationary ring 104 and adjusting the friction and sealing pressure of the stationary ring 104 and the moving ring 103.

[0049] The working principle of the plastic recycling equipment provided in the above embodiments is as follows: High-pressure lubricating oil is injected between the moving ring 103 and the stationary ring 104 on the rotor 102. Then, the rotor 102 is driven to rotate by the power mechanism. At the same time, the rotor 102 drives the moving ring 103 to rotate relative to the stationary ring 104. The rotor 102 mixes the raw materials in the mixing chamber 101. At this time, the rotor 102 will vibrate axially due to the reaction force from the raw materials.

[0050] The rotation angle of the shift fork plate 131 is controlled by the power component 132, thereby changing the thrust of the push rod on the top ring 133. The top ring 133 controls the squeezing force of the push ring 106 on the coolant in the first cavity 110 through the connecting rod 135. The coolant applies the squeezing force evenly to the cylinder seat 105 through the ring groove. The cylinder seat 105 applies a uniform thrust to all parts of the stationary ring 104, so that the friction between the contact surfaces of the stationary ring 104 and the moving ring 103 is uniform.

[0051] During the rotation of the stationary ring 104 relative to the moving ring 103, the two will generate heat through friction. The stationary ring 104 transfers the heat to the coolant in the first chamber 110 through the partition cylinder 112. The coolant in the first chamber 110 conducts the heat to the coolant in the second chamber 111, and then the heat is dissipated through the cold pipe 126.

[0052] As the internal mixer 100 operates for longer, the heat of the coolant in the first chamber 110 gradually accumulates. When the coolant temperature rises to a preset value, the bimetallic strip 114 begins to bend and deform. The two ends of the bimetallic strip 114 begin to approach each other and drive the rotating drum 113 to rotate. The rotation of the rotating drum 113 causes the through groove 117 and the through hole 116 to become misaligned until the first chamber 110 and the second chamber 111 are completely separated. As the drum 113 rotates, the positioning block 122 slides relative to the drum 113 in the positioning groove 123 and gradually approaches and slides into the slide groove 124. At this time, the drum seat 105 still produces a small sway under the axial vibration of the internal mixer 100 rotor 102. The partition cylinder 112 and the drum 113 sway accordingly, while the retaining ring 120 gradually slides back and forth relative to the partition cylinder 112 under the action of the spring 121. The sliding of the retaining ring 120 causes the coolant in the second chamber 111 to continuously pass through the flow channel 127, while the paddle 128 will prevent the coolant from flowing back. The coolant in the second chamber 111 begins to form a directional circulation and flows through the cold pipe 126 to achieve efficient heat dissipation.

[0053] When the rotating drum 113 rotates, it causes the coolant in the first chamber 110 to flow briefly through the guide plate 129, promoting a uniform temperature distribution of the coolant in the first chamber 110. This enhances the heat dissipation effect on the stationary ring 104 and improves the sealing reliability of the end faces of the moving ring 103 and the stationary ring 104. At this time, the first chamber 110 and the second chamber 111 can conduct heat across the chambers through the thermal conductivity of the partition cylinder 112 and the rotating drum 113.

[0054] When the temperature of the coolant in the first chamber 110 drops below the preset value, the bimetallic strip 114 rebounds and returns to its initial shape. The bimetallic strip 114 pushes the rotating drum 113 to rotate in the opposite direction, causing the through groove 117 and the through hole 116 to overlap again. The first chamber 110 and the second chamber 111 are connected again, and the coolant in the first chamber 110 flows briefly again. This effectively avoids excessive local temperature difference in the coolant in the first chamber 110, which could cause local deterioration and ensure long-term heat transfer and cooling stability.

[0055] A plastic recycling process includes the following steps: S1. Add raw materials into the mixing chamber 101; then seal the mixing chamber 101 and pressurize the raw materials in the mixing chamber 101 by using the top plug.

[0056] S2. The rotor 102 rotates to process the raw material in the mixing chamber 101; the moving ring 103 rotates relative to the stationary ring 104 and engages with the stationary ring 104 through its end face, thereby sealing the mixing chamber 101; the shift fork mechanism applies uniform pressure to the end face of the stationary ring 104 through the pressure equalization mechanism; the shift fork mechanism applies a thrust to the push ring 106, and the push ring 106 applies this thrust evenly to the stationary ring 104 through the coolant in the first chamber 110 via the cylinder seat 105; after the stationary ring 104 receives a uniform axial thrust, it abuts against the moving ring 103. With the force being equal everywhere, the frictional loss between the moving ring 103 and the stationary ring 104 is relatively uniform, resulting in a better sealing effect. The heat generated by the friction between the stationary ring 104 and the moving ring 103 raises the temperature of the first chamber 110 to the preset temperature. Then, the bimetallic strip 114 drives the rotating drum 113 to rotate, thus separating the first chamber 110 from the second chamber 111. The heat in the first chamber 110 is transferred to the second chamber 111 through the rotating drum 113 and the partition cylinder 112. The coolant in the second chamber 111 flows under the action of the baffle ring 120 and is dissipated through the cooling pipe 126.

[0057] S3. After the raw materials are processed, they are discharged from the mixing chamber 101.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A plastic recycling device, comprising a mixer, a mixing chamber on the mixer, a rotor penetrating the mixing chamber and a rotating ring and a stationary ring mounted on the rotor, wherein the stationary ring and the rotating ring are coaxial with the rotor and rotatably connected to form an end-face sealing mechanism, characterized in that, The internal mixer is equipped with a pressure equalization mechanism and a shift fork mechanism. The pressure equalization mechanism includes a barrel seat, a push ring, a separator assembly, and a turbulence evacuation assembly. The barrel seat is slidably sleeved on the rotor and connected to the end of the stationary ring away from the rotating ring. The end of the barrel seat away from the stationary ring has an annular groove coaxial with the stationary ring. The push ring is sleeved in the annular groove and slidably disposed in the annular groove along the rotor axis. The bottom wall of the annular groove is parallel to the end face of the stationary ring. The push ring and the bottom wall of the annular groove together form a sealed cavity filled with coolant. The separator assembly is used to divide the cavity into a first cavity and a second cavity. It can maintain communication between the first cavity and the second cavity when the coolant temperature in the first cavity is lower than a set value, and cut off the communication between the first cavity and the second cavity when the temperature rises to the set value, so that the coolant in the first cavity remains static. The coolant in the second cavity can exchange heat with the outside. When the push ring approaches the stationary ring, it can squeeze the first cavity, causing the coolant in the first cavity to form pressure and act evenly on the bottom wall of the ring groove; the turbulence assembly is used to promote the flow of coolant in the second cavity when the first cavity and the second cavity are isolated from each other; the shift fork mechanism is used to apply a thrust to the push ring in the axial direction of the stationary ring.

2. The plastic recycling equipment according to claim 1, characterized in that, The partition assembly includes a partition cylinder, a rotating cylinder, and a detection element. The partition cylinder is disposed within the cavity and has protruding rings extending radially at both ends. The partition cylinder is coaxial with the ring groove and connected to the cylinder seat through the protruding rings. The partition cylinder is located between the first cavity and the second cavity. A through hole is opened on the circumferential surface of the partition cylinder, and the first cavity and the second cavity are connected through the through hole. The rotating cylinder is rotatably disposed on the partition cylinder and located within the first cavity. A through groove is provided on the rotating cylinder. The rotation of the rotating cylinder can cause the through groove and the through hole to coincide radially or be offset circumferentially, thereby connecting or separating the first cavity and the second cavity. The detection element is used to monitor the temperature of the coolant in the first cavity and control the rotation of the rotating cylinder according to the temperature.

3. The plastic recycling equipment according to claim 2, characterized in that, The testing component is a bimetallic strip, with its two ends connected to the rotating drum and the partition drum, respectively. When the bimetallic strip deforms due to temperature, it bends and deforms along the rotor axis.

4. A plastic recycling device according to claim 2, characterized in that, The turbulence-disrupting assembly includes a retaining ring, springs, and a positioning block. The retaining ring is sleeved on the partition cylinder and slidably connected to the partition cylinder. Multiple springs are provided, which are evenly arranged along the circumference of the retaining ring and their two ends are respectively connected to the retaining ring and the convex ring. The rotating cylinder has a positioning groove and a sliding groove on the side near the retaining ring, which are connected. The positioning block is set on the side of the retaining ring near the rotating cylinder and passes through the through hole on the partition cylinder and is slidably connected to the rotating cylinder. When the first cavity and the second cavity are separated, the positioning block slides in the sliding groove along the axial direction of the rotating cylinder. When the first cavity and the second cavity are connected, the positioning block slides in the positioning groove along the circumference of the rotating cylinder.

5. A plastic recycling device according to claim 4, characterized in that, Multiple cold tubes are provided on the outer circumferential surface of the cylinder base. The multiple cold tubes are arranged along the circumference of the cylinder base and both ends of the tubes are connected to the second cavity. The retaining ring is located between the two ends of the cold tubes.

6. A plastic recycling device according to claim 4, characterized in that, The retaining ring is slidably connected to the partition cylinder and the cylinder seat respectively. A flow channel is opened on the retaining ring and passes through the retaining ring along the axial direction of the retaining ring. A deflector is provided at one end of the retaining ring. The deflector is inclined and one side is connected to the retaining ring. The retaining ring can slide in one direction to make the deflector move closer to the retaining ring and block the flow channel.

7. A plastic recycling device according to claim 4, characterized in that, The cylinder base, rotating cylinder, partition cylinder, and retaining ring all adopt a split structure, divided into left and right parts along the plane where their respective axes lie.

8. A plastic recycling device according to claim 2, characterized in that, A guide plate is provided on the inner circumferential surface of the rotating drum. The guide plate is inclined along the circumference of the rotating drum to guide the coolant in the first chamber to flow along the rotor axis.

9. A plastic recycling device according to claim 1, characterized in that, The shift fork mechanism includes a stud, a shift fork plate, and a power component. The shift fork plate is mounted on the internal mixer and located at the end of the drum seat away from the stationary ring in the axial direction. The shift fork plate has two push rods located on both sides of the rotor in the radial direction. The power component is mounted on the shift fork plate and is used to control the shift fork plate to move along the rotor axial direction. The stud is mounted on the internal mixer and abuts against the shift fork plate in the rotor axial direction. The stud is located between the push rods and the power component. The stud acts as a fulcrum to drive the shift fork plate to rotate around it, thereby enabling the push rods to apply a thrust to the push ring.

10. A plastic recycling process, utilizing the plastic recycling equipment according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Add raw materials to the mixing chamber; S2. The rotor rotates to process the raw materials in the mixing chamber; the moving ring rotates relative to the stationary ring and seals the mixing chamber by engaging with the stationary ring through its end face; the shift fork mechanism applies uniform pressure to the end face of the stationary ring through the pressure equalization mechanism. S3. After the raw materials are processed, they are discharged from the mixing chamber.

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