Production equipment and process for PPS (polyphenylene sulfite) pipe in desulfurization wastewater heat exchange system of power plant

Abstract

The invention relates to the technical field of PPS pipe production, and discloses a PPS pipe production device and process for a power plant desulfurization wastewater heat exchange system, the PPS pipe production device for the power plant desulfurization wastewater heat exchange system comprises a base, an extrusion cylinder, a feeding hopper, a die head, a screw rod, a perforated plate and a gear motor, and further comprises a mixing mechanism, the screw is arranged at the end of the screw rod; the mixing mechanism comprises a driving shaft fixedly connected with the screw rod, a lantern ring fixed to the driving shaft, shaft rods fixed at equal intervals in the circumferential direction of the lantern ring, sliding sleeves slidably connected to the shaft rods in a sleeving mode through splines, a connecting shaft fixedly connected with the sliding sleeves, mixing petals arranged on the connecting shaft and springs arranged between the shaft rods and the sliding sleeves. The mixing petals are driven to do periodic reciprocating motion in the radial direction of the shaft rod, low-temperature melt on the edge can be pushed to the center, high-temperature melt in the center can be brought to the edge, and bidirectional exchange of the melt is achieved to counteract the temperature gradient.

Description

Technical Field

[0001] This invention relates to the field of PPS pipe production technology, and in particular to a PPS pipe production equipment and process for a power plant desulfurization wastewater heat exchange system. Background Technology

[0002] PPS plastic, as a thermoplastic special engineering plastic, has the characteristics of resistance to strong acids and alkalis, long-term service temperature of over 200℃, and tensile and flexural strength superior to most engineering plastics. Pipes made from PPS through extrusion molding can be stably adapted to the transportation and heat exchange of desulfurization wastewater, extending the service life of equipment. The production of PPS pipes mainly adopts plastic extrusion molding process. A complete PPS pipe production line mainly includes the following equipment: feeding machine, mixing equipment, extruder, traction machine, and pelletizer.

[0003] The extruder mainly consists of a feeding system, a barrel, a screw, a die head, a transmission system, and a temperature control system. In actual operation, the raw material is fed into the feeding section of the barrel, then pushed by the screw and preheated and softened before entering the compression section. Under the extrusion and shearing action caused by the reduced screw pitch, the raw material melts and expels air bubbles, forming a dense melt. This melt is then pushed into the die head by the screw, shaped by the die, cooled and solidified, pulled by the traction machine, and finally cut into fixed-length pipes by the pelletizer, completing the entire extrusion molding process.

[0004] In existing technologies, the melt conveying process of extruders requires the use of perforated plates to achieve melt filtration and uniform distribution. However, the melt flows through different paths on the perforated plates. The melt in the central region experiences more concentrated screw pushing force and lower flow resistance, resulting in a much faster flow rate than the melt in the edge region. This faster flow rate is accompanied by more intense shearing action, and the shearing heat effect causes the temperature rise of the central melt to be much greater than that of the edge melt, forming a significant temperature gradient. This leads to a significant temperature difference in the melt entering the die, which in turn causes uneven melt mixing. The low-temperature melt at the edge, due to insufficient shearing action and lower temperature, results in incomplete plasticization, making it easy for unmelted PPS particles or additive agglomerates to remain. This prevents the formation of a melt with uniform composition and structure. When the melt with insufficient temperature and mixing uniformity enters the subsequent die for shaping, the fluidity and cooling shrinkage rate of the melt in different regions vary. This not only generates residual stress inside the pipe but also further affects the stability of the pipe. At the same time, the corrosion resistance and mechanical strength of different parts of the pipe are inconsistent, easily forming weak areas. Summary of the Invention

[0005] The purpose of this invention is to provide a PPS tube production equipment and process for a power plant desulfurization wastewater heat exchange system, in order to solve the problem mentioned in the background art where the large temperature difference between the center and the edge due to different melt paths when the melt is transported through a multi-orifice plate, resulting in uneven mixing.

[0006] This invention provides a PPS tube production equipment and process for a power plant desulfurization wastewater heat exchange system, employing the following technical solution:

[0007] A PPS tube production equipment for a power plant desulfurization wastewater heat exchange system includes:

[0008] The base, the extrusion cylinder mounted on the base, the feed hopper mounted at the inlet of the extrusion cylinder, the die head mounted at the outlet of the extrusion cylinder, the screw rod mounted inside the extrusion cylinder, the perforated plate mounted at the outlet of the extrusion cylinder, and the geared motor mounted on the base for driving the screw rod to rotate, further comprising:

[0009] A mixing mechanism is provided at the end of a screw rod. The mixing mechanism includes a drive shaft fixedly connected to the screw rod, a collar fixed on the drive shaft, a shaft rod equidistantly fixed along the circumferential direction of the collar, a sliding sleeve slidably sleeved on the shaft rod via a spline, a connecting shaft fixedly connected to the sliding sleeve, a mixing disc provided on the connecting shaft, and a spring provided between the shaft rod and the sliding sleeve.

[0010] The control mechanism is mounted on the drive shaft. The control mechanism includes a fixed shaft fixed to the drive shaft, a bushing rotatably sleeved on the fixed shaft, a cam fixed on the bushing, a driven bevel gear fixed on the bushing, a driving bevel gear fixed on the fixed shaft, and a transmission bevel gear meshing with the driven bevel gear and the driving bevel gear. The transmission bevel gear is rotatably connected to a U-shaped frame via a rotating shaft. The two ends of the U-shaped frame are rotatably sleeved on the fixed shaft and the bushing, respectively.

[0011] Furthermore, the outer periphery of the cam is diamond-shaped, and the outer periphery of the cam slides in contact with the connecting shaft. In the two sets of oppositely arranged vertices of the cam, the distance between one set of vertices is greater than the distance between the other set of vertices.

[0012] The end face of the cam is also provided with a slot for the melt to pass through.

[0013] Furthermore, a swing mechanism is provided between the mixing petal and the connecting shaft. The swing mechanism includes a connecting seat fixed to the end of the connecting shaft. The end of the mixing petal near the connecting shaft is fixedly connected to the connecting shaft, and both ends of the connecting shaft are rotatably connected to the connecting seat.

[0014] Furthermore, one end of the connecting shaft extends to the outside of the connecting seat and is fixedly connected to an extension plate. Each set of shafts is fixedly connected to a fixing rod, and a protrusion corresponding to the extension plate is fixedly connected to the fixing rod.

[0015] Furthermore, the other end of the connecting shaft extends outside the connecting seat and is fixed with a baffle plate, and the other end of the connecting shaft is provided with a torsion spring, with the two ends of the torsion spring fixed to the baffle plate and the connecting seat respectively.

[0016] Furthermore, a stop bar is fixedly connected to the connecting seat, and the stop bar is in contact with the extension plate.

[0017] Furthermore, the mixing petal is generally scoop-shaped, with an arc-shaped concave surface on its inner side, and an inwardly inclined edge at the end of the arc-shaped concave surface away from the connecting shaft.

[0018] Furthermore, an elastic sheet is fixedly connected between the two sets of connecting shafts that are arranged opposite to each other, and the elastic sheet is arranged in a wave shape.

[0019] Furthermore, an outer cover is fixedly connected to one end of the drive shaft near the cam, and the outer cover and the cam are rotatably connected by a sealed bearing.

[0020] A manufacturing process for PPS tubes in a power plant desulfurization wastewater heat exchange system, using the aforementioned PPS tube manufacturing equipment for a power plant desulfurization wastewater heat exchange system, includes the following steps:

[0021] Step 1: Pre-treat the PPS granules with antioxidants and reinforcing agents in a certain proportion to obtain a mixed raw material;

[0022] Step 2: Add the mixed raw materials to the feeding hopper and start the geared motor to drive the screw to rotate;

[0023] Step 3: The screw pushes the raw material to heat and melt inside the extrusion cylinder. The drive shaft rotates with the screw and drives the connecting shaft and mixing plate to stir the melt. At the same time, the cam drives the connecting shaft and mixing plate to move back and forth to further mix the melt.

[0024] Step 4: Initial forming of the pipe. After the melt is mixed, it is filtered through a perforated plate and then extruded through a die to form a PPS pipe blank.

[0025] Step 5: Fixed-length cutting. After the extruded PPS tube blank is cooled, it is drawn and cut to a preset length to obtain a fixed-length PPS tube.

[0026] The beneficial effects of this invention are:

[0027] 1. By setting up a mixing mechanism and a control mechanism, the rotational power of the drive shaft is used to control the cam to rotate continuously in the opposite direction to the drive shaft along the bushing. This causes the distal end and proximal end of the cam to alternately contact the connecting shaft, driving the mixing petal to make periodic reciprocating motion along the radial direction of the shaft. Through the radial reciprocating motion of the mixing petal, the low-temperature melt at the edge can be pushed towards the center, and the high-temperature melt at the center can be brought towards the edge, realizing bidirectional exchange of the melt to offset the temperature gradient. At the same time, in conjunction with the rotational stirring of the mixing petal, the shearing effect on the melt is enhanced, further breaking up the incompletely melted PPS particles and additive agglomerates, and improving the plasticization uniformity of the melt.

[0028] 2. By setting up a swing mechanism, when the connecting shaft slides outward, the extension plate contacts the protruding rod and pushes the mixing petal to swing and scrape against the inner wall of the extrusion cylinder, thereby increasing the contact range between the mixing petal and the melt. This process tumbles and scrapes the melt near the inner wall of the extrusion cylinder, preventing the edge melt from plasticizing lag due to insufficient stirring, and further improving the uniform mixing effect of the melt. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0030] Figure 2 This is a top view of the cross-sectional structure of the present invention;

[0031] Figure 3 This is a partial three-dimensional cross-sectional view of the extrusion cylinder of the present invention;

[0032] Figure 4 This is a three-dimensional structural diagram of the screw rod, perforated plate, mixing mechanism, and control mechanism of the present invention.

[0033] Figure 5 This is a three-dimensional structural diagram of the mixing mechanism, the control mechanism, and the oscillation mechanism of the present invention.

[0034] Figure 6 This is a three-dimensional structural diagram of the drive shaft, collar, shaft, sliding sleeve, connecting shaft, mixing plate, and spring of the present invention;

[0035] Figure 7 This is a three-dimensional structural diagram of the connecting shaft and elastic sheet of the present invention;

[0036] Figure 8 This is a three-dimensional cross-sectional view of the drive shaft of the present invention;

[0037] Figure 9 This is a front view of the connecting shaft, mixing plate, spring, and cam of the present invention.

[0038] Figure 10 This is a three-dimensional structural diagram of the shaft, sliding sleeve, connecting shaft, mixing plate, and swing mechanism of the present invention.

[0039] Figure 11 This is an exploded three-dimensional structural diagram of the mixing compartment and connecting seat of the present invention.

[0040] In the picture:

[0041] 1. Base; 2. Extrusion cylinder; 3. Feed hopper; 4. Die head; 5. Screw rod; 6. Perforated plate; 7. Mixing mechanism; 71. Drive shaft; 72. Collar; 73. Shaft; 74. Sliding sleeve; 75. Connecting shaft; 76. Mixing disc; 77. Spring; 78. Elastic sheet; 8. Adjustment mechanism; 81. Fixed shaft; 82. Bushing; 83. Cam; 84. Driven bevel gear; 85. Driving bevel gear; 86. Transmission bevel gear; 87. U-shaped frame; 88. Groove; 89. Outer cover; 9. Swinging mechanism; 91. Connecting seat; 92. Connecting shaft; 93. Extension plate; 94. Fixed rod; 95. Protruding rod; 96. Baffle; 97. Torsion spring; 98. Stop bar; 10. Gear motor. Detailed Implementation

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] Example 1, refer to Figures 1-2 The present invention provides a PPS tube production equipment for a power plant desulfurization wastewater heat exchange system, including a base 1, an extrusion cylinder 2 disposed on the base 1, a feeding hopper 3 installed at the inlet of the extrusion cylinder 2, a die head 4 disposed at the outlet of the extrusion cylinder 2, a screw rod 5 disposed inside the extrusion cylinder 2, a perforated plate 6 disposed at the outlet of the extrusion cylinder 2, and a reduction motor 10 disposed on the base 1 for driving the screw rod 5 to rotate. The extrusion cylinder 2 is also provided with a temperature control component and a temperature sensor.

[0044] Reference Figures 3-6 It also includes:

[0045] The mixing mechanism 7, located at the end of the screw rod 5, specifically includes a drive shaft 71 fixedly connected to the screw rod 5, a collar 72 fixed to the drive shaft 71, a shaft 73 equidistantly fixed along the circumferential direction of the collar 72, a sliding sleeve 74 slidably sleeved on the shaft 73 via a spline, a connecting shaft 75 fixedly connected to the sliding sleeve 74, a mixing disc 76 located on the connecting shaft 75, and a spring 77 located between the shaft 73 and the sliding sleeve 74. The two ends of the spring 77 are respectively fixed to the shaft 73 and the sliding sleeve 74. Four sets of rings 73 are fixed at equal intervals along the circumference of the collar 72. When the geared motor 10 drives the screw rod 5 to rotate, the drive shaft 71 is fixedly connected to the end of the screw rod 5 away from the geared motor 10. Therefore, the screw rod 5 can synchronously drive the drive shaft 71 to rotate. The collar 72 rotates with the drive shaft 71 and drives the mixing plate 76 to make a circular motion through the shaft 73, the sliding sleeve 74, and the connecting shaft 75. At the same time, the sliding sleeve 74 is slidably connected to the shaft 73 through a spline, which allows the sliding sleeve 74 to rotate synchronously with the shaft 73 while sliding radially along the shaft 73.

[0046] It should be noted that the mixing petal 76 is shaped like a spoon, with an arc-shaped concave surface on its inner side. The end of the arc-shaped concave surface away from the connecting shaft 75 has an inwardly inclined edge. The arc-shaped concave surface of the mixing petal 76 can carry the melt to mix in the extrusion cylinder 2, forming a stirring effect on the melt in the extrusion cylinder 2, thereby initially dispersing the incompletely melted PPS particles or additive agglomerates. When the inwardly inclined edge comes into contact with the melt, it can form an additional shearing effect on the melt, which can further break up the incompletely melted PPS particles or additive agglomerates and promote the full fusion of particles and melt.

[0047] Reference Figure 5 , Figures 8-9 A control mechanism 8 is provided on the drive shaft 71. Specifically, the control mechanism 8 includes a fixed shaft 81 fixed to the drive shaft 71, a bushing 82 rotatably sleeved on the fixed shaft 81, a cam 83 fixed on the bushing 82, a driven bevel gear 84 fixed on the bushing 82, a driving bevel gear 85 fixed on the fixed shaft 81, and a transmission bevel gear 86 meshing with the driven bevel gear 84 and the driving bevel gear 85. The transmission bevel gear 86 is rotatably connected to a U-shaped frame 87 via a rotating shaft. The two ends of the frame 87 are respectively rotatably sleeved on the fixed shaft 81 and the bushing 82. When the fixed shaft 81 rotates under the drive shaft 71, the active bevel gear 85 rotates synchronously with it, driving the meshing transmission bevel gear 86 to rotate. The transmission bevel gear 86 is stably meshed under the support of the U-shaped frame 87, thereby driving the driven bevel gear 84 to rotate, causing the bushing 82 with the driven bevel gear 84 fixed to rotate in the opposite direction to the fixed shaft 81, driving the cam 83 fixed on the bushing 82 to rotate synchronously with the bushing 82.

[0048] Specifically, the outer periphery of the cam 83 is set in a rhombus shape, and the outer periphery of the cam 83 slides in contact with the connecting shaft 75. Among the two sets of opposite vertices of the cam 83, the distance between one set of vertices is greater than the distance between the other set of vertices. It should be noted that the set of opposite vertices with a larger distance is the distal end, and the set of opposite vertices with a smaller distance is the proximal end.

[0049] When the distal end of the cam 83 contacts the corresponding connecting shaft 75, it applies a thrust toward the inner wall of the extrusion cylinder 2 to the corresponding connecting shaft 75, pushing the connecting shaft 75 to drive the sliding sleeve 74 to slide outward along the shaft 73. At this time, the high-temperature melt in the central area can be pushed to the edge to promote the mixing of high and low temperature melts. At the same time, the spring 77 in the mixing mechanism 7 is compressed to store elastic potential energy.

[0050] When the proximal end of the cam 83 contacts the corresponding connecting shaft 75, the thrust disappears, the spring 77 releases its elastic potential energy, and pulls the sliding sleeve 74 to drive the connecting shaft 75 to reset towards the drive shaft 71. At this time, the edge melt can be pushed towards the center to further enhance the melt exchange and temperature equalization effect.

[0051] By alternately contacting the distal and proximal ends of the cam 83 with the connecting shaft 75, the mixing petal 76 makes a periodic reciprocating motion along the radial direction of the shaft 73. When the mixing petal 76 moves towards the inner wall of the extrusion cylinder 2, it can push the high-temperature melt in the central area to the edge. When the mixing petal 76 returns to the drive shaft 71, it can bring the low-temperature melt in the edge area back to the center. Through the exchange of melt from the center to the edge, the temperature difference problem before the melt flows through the perforated plate 6 can be effectively offset. Under the combined action of rotation and reciprocating motion, the mixing petal 76 can form a multi-directional shear force on the melt. Especially for the melt in the edge area that is not fully plasticized, it can further break up the unmelted PPS particles, promote the full fusion of particles and melt, avoid weak areas of pipe performance caused by insufficient plasticization, and provide uniform melt raw materials for subsequent die head 4 shaping.

[0052] Meanwhile, a slot 88 is provided on the end face of the cam 83 for the melt to pass through. When the melt flows into the perforated plate 6, it can pass through the area of ​​the cam 83 through the slot 88.

[0053] An outer cover 89 is fixedly connected to one end of the drive shaft 71 near the cam 83. The outer cover 89 and the cam 83 are rotatably connected through a sealed bearing. The outer cover 89 serves to isolate the molten material and prevent it from entering the outer cover 89, thereby protecting the fixed shaft 81, the driven bevel gear 84, the driving bevel gear 85, and the transmission bevel gear 86.

[0054] Reference Figure 7 Two sets of connecting shafts 75 are fixedly connected to each other. The elastic sheet 78 is wavy. When the connecting shaft 75 moves radially along the shaft 73 under the drive of the control mechanism 8, the elastic sheet 78 can expand and contract elastically. During the expansion and contraction process, the wavy surface of the elastic sheet 78 will generate additional shearing force on the surrounding melt, which helps to break up incompletely melted PPS particles or additive agglomerates and improve the plasticization uniformity of the melt.

[0055] Furthermore, refer to Figures 10-11A swing mechanism 9 is provided between the mixing disc 76 and the connecting shaft 75. Specifically, the swing mechanism 9 includes a connecting seat 91 fixed to the end of the connecting shaft 75. A connecting shaft 92 is fixedly connected to one end of the mixing disc 76 near the connecting shaft 75. Both ends of the connecting shaft 92 are rotatably connected to the connecting seat 91. One end of the connecting shaft 92 extends out of the connecting seat 91 and is fixedly connected to an extension plate 93. A fixing rod 94 is fixedly connected to each set of shafts 73. A connecting rod 94 is fixedly connected to the extension plate 95. The corresponding protruding rod 95 is cylindrical, and its axis is perpendicular to the corresponding extension plate 93. When the distal end of the cam 83 contacts the corresponding connecting shaft 75, and pushes the connecting shaft 75 to drive the sliding sleeve 74 to slide outward along the shaft 73, the extension plate 93 can contact the protruding rod 95. The protruding rod 95 exerts a thrust on the extension plate 93, causing the extension plate 93 to drive the connecting shaft 92 to rotate around its own axis, thereby driving the mixing petal 76 to swing towards the inner wall of the extrusion cylinder 2, thus achieving the scraping of the surrounding melt.

[0056] The other end of the connecting shaft 92 extends to the outside of the connecting seat 91 and is fixed with a baffle 96. The other end of the connecting shaft 92 is provided with a torsion spring 97. The two ends of the torsion spring 97 are fixed to the baffle 96 and the connecting seat 91 respectively. After the extension plate 93 and the protrusion 95 are disengaged, the torsion spring 97 can release elastic potential energy and drive the connecting shaft 92 to rotate in the opposite direction and reset.

[0057] Meanwhile, a stop bar 98 is fixedly connected to the connecting seat 91. The stop bar 98 is in contact with the extension plate 93. The stop bar 98 can limit the extension plate 93, thereby causing the mixing segment 76 to return to the initial angle.

[0058] The invention provides a working principle for a PPS pipe production equipment used in a heat exchange system for desulfurization wastewater in power plants: PPS granules are mixed with antioxidants and reinforcing agents in a specific ratio to obtain a mixed raw material, which is then added to a feeding hopper 3. A reduction motor 10 is started to drive a screw rod 5 to rotate. The screw rod 5 drives a drive shaft 71 to rotate synchronously. A collar 72 on the drive shaft 71 rotates with it, thereby controlling the shaft 73, sliding sleeve 74, connecting shaft 75, and mixing disc 76 to perform circular motion. Simultaneously, the drive shaft 71 drives a fixed shaft 81 to rotate. An active bevel gear 85 fixed on the fixed shaft 81 rotates synchronously, driving a meshing transmission bevel gear 86 to rotate. The transmission bevel gear 86 drives a driven bevel gear 84 to rotate, causing a bushing 82 with the driven bevel gear 84 fixed to rotate in the opposite direction to the fixed shaft 81. This, in turn, drives a diamond-shaped cam 83 fixed on the bushing 82 to rotate synchronously in the opposite direction.

[0059] When the distal end of the cam 83 contacts the connecting shaft 75, it pushes the connecting shaft 75 to drive the sliding sleeve 74 to slide outward along the shaft 73, pushing the central high-temperature melt to the edge. When the proximal end of the cam 83 contacts the connecting shaft 75, the spring 77 releases its elastic potential energy, pulls the sliding sleeve 74 to reset, and brings the edge low-temperature melt back to the center, realizing the exchange of melt from the center to the edge.

[0060] When the connecting shaft 75 slides outward, the extension plate 93 contacts the protrusion 95 on the fixed rod 94, pushing the connecting shaft 92 to rotate and causing the mixing petal 76 to swing towards the inner wall of the extrusion cylinder 2 to further scrape the melt. After the contact is broken, the torsion spring 97 drives the connecting shaft 92 to reset. The mixing petal 76 returns to its initial angle through the limit of the stop rod 98. The mixed melt flows to the porous plate 6 and is finally shaped into a uniform PPS tube by the die head 4.

[0061] Example 2: This invention provides a manufacturing process for PPS tubes used in a power plant desulfurization wastewater heat exchange system. The process utilizes equipment for manufacturing PPS tubes in a power plant desulfurization wastewater heat exchange system and includes the following steps:

[0062] Step 1: Pre-treat the PPS granules with antioxidants and reinforcing agents in a certain proportion to obtain a mixed raw material;

[0063] Step 2: Add the mixed raw materials to the feeding hopper 3, and start the geared motor 10 to drive the screw rod 5 to rotate;

[0064] Step 3: The screw 5 pushes the raw material to be heated and melted in the extrusion cylinder 2. The drive shaft 71 rotates with the screw 5 and drives the connecting shaft 75 and the mixing plate 76 to stir the melt. At the same time, the cam 83 drives the connecting shaft 75 and the mixing plate 76 to move back and forth to further mix the melt.

[0065] Step 4: Initial forming of the pipe. The mixed melt is filtered through the porous plate 6 and then extruded through the die head 4 to form a PPS pipe blank.

[0066] Step 5: Fixed-length cutting. After the extruded PPS tube blank is cooled, it is drawn and cut to a preset length to obtain a fixed-length PPS tube.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A PPS tube production equipment for a power plant desulfurization wastewater heat exchange system, comprising: The system comprises a base (1), an extrusion cylinder (2) mounted on the base (1), a feeding hopper (3) installed at the inlet of the extrusion cylinder (2), a die head (4) installed at the outlet of the extrusion cylinder (2), a screw rod (5) installed inside the extrusion cylinder (2), a perforated plate (6) installed at the outlet of the extrusion cylinder (2), and a geared motor (10) mounted on the base (1) for driving the screw rod (5) to rotate. The system is characterized by further comprising: The mixing mechanism (7) is located at the end of the screw rod (5). The mixing mechanism (7) includes a drive shaft (71) fixedly connected to the screw rod (5), a collar (72) fixed on the drive shaft (71), a shaft (73) fixed at equal intervals along the circumferential direction of the collar (72), a sliding sleeve (74) slidably sleeved on the shaft (73) through a spline, a connecting shaft (75) fixedly connected to the sliding sleeve (74), a mixing disc (76) provided on the connecting shaft (75), and a spring (77) provided between the shaft (73) and the sliding sleeve (74). The control mechanism (8) is set on the drive shaft (71). The control mechanism (8) includes a fixed shaft (81) fixed to the drive shaft (71), a bushing (82) rotatably sleeved on the fixed shaft (81), a cam (83) fixed on the bushing (82), a driven bevel gear (84) fixed on the bushing (82), an active bevel gear (85) fixed on the fixed shaft (81), and a transmission bevel gear (86) meshing with the driven bevel gear (84) and the active bevel gear (85). The transmission bevel gear (86) is rotatably connected to a U-shaped frame (87) through a rotating shaft. The two ends of the U-shaped frame (87) are respectively rotatably sleeved on the fixed shaft (81) and the bushing (82).

2. The PPS tube production equipment for a power plant desulfurization wastewater heat exchange system according to claim 1, characterized in that: The outer periphery of the cam (83) is diamond-shaped, and the outer periphery of the cam (83) slides in contact with the connecting shaft (75). Among the two sets of opposite vertices of the cam (83), the distance between one set of vertices is greater than the distance between the other set of vertices. The end face of the cam (83) is also provided with a slot (88) for the melt to pass through.

3. The PPS tube production equipment for a power plant desulfurization wastewater heat exchange system according to claim 1, characterized in that: A swing mechanism (9) is provided between the mixing petal (76) and the connecting shaft (75). The swing mechanism (9) includes a connecting seat (91) fixed at the end of the connecting shaft (75). A connecting shaft (92) is fixedly connected to one end of the mixing petal (76) near the connecting shaft (75). Both ends of the connecting shaft (92) are rotatably connected to the connecting seat (91).

4. The PPS tube production equipment for a power plant desulfurization wastewater heat exchange system according to claim 3, characterized in that: One end of the connecting shaft (92) extends to the outside of the connecting seat (91) and is fixedly connected to an extension plate (93). Each set of shafts (73) is fixedly connected to a fixing rod (94), and a protruding rod (95) corresponding to the extension plate (93) is fixedly connected to the fixing rod (94).

5. The PPS tube production equipment for a power plant desulfurization wastewater heat exchange system according to claim 4, characterized in that: The other end of the connecting shaft (92) extends to the outside of the connecting seat (91) and is fixed with a baffle (96). The other end of the connecting shaft (92) is provided with a torsion spring (97), and the two ends of the torsion spring (97) are fixed on the baffle (96) and the connecting seat (91) respectively.

6. The PPS tube production equipment for a power plant desulfurization wastewater heat exchange system according to claim 3, characterized in that: A stop bar (98) is fixedly connected to the connecting seat (91), and the stop bar (98) is in contact with the extension plate (93).

7. The PPS tube production equipment for a power plant desulfurization wastewater heat exchange system according to claim 1, characterized in that: The mixing plate (76) is generally spoon-shaped, with an arc-shaped concave surface on its inner side, and an inwardly inclined edge at the end of the arc-shaped concave surface away from the connecting shaft (75).

8. The PPS tube production equipment for a power plant desulfurization wastewater heat exchange system according to claim 1, characterized in that: An elastic sheet (78) is fixedly connected between the two sets of connecting shafts (75) that are arranged opposite to each other. The elastic sheet (78) is arranged in a wave shape.

9. The PPS tube production equipment for a power plant desulfurization wastewater heat exchange system according to claim 1, characterized in that: The drive shaft (71) is fixedly connected to an outer cover (89) at one end near the cam (83), and the outer cover (89) and the cam (83) are rotatably connected by a sealed bearing.

10. A manufacturing process for PPS tubes in a power plant desulfurization wastewater heat exchange system, employing the PPS tube manufacturing equipment for a power plant desulfurization wastewater heat exchange system as described in claim 1, characterized in that... Includes the following steps: Step 1: Pre-treat the PPS granules with antioxidants and reinforcing agents in a certain proportion to obtain a mixed raw material; Step 2: Add the mixed raw materials to the feeding hopper (3), and start the geared motor (10) to drive the screw rod (5) to rotate; Step 3: The screw (5) pushes the raw material to be heated and melted in the extrusion cylinder (2). The drive shaft (71) rotates with the screw (5) and drives the connecting shaft (75) and mixing plate (76) to stir the melt. At the same time, the cam (83) drives the connecting shaft (75) and mixing plate (76) to move back and forth to further mix the melt. Step 4: Initial forming of the pipe. After the melt is mixed, it is filtered through a perforated plate (6) and then extruded through a die (4) to form a PPS pipe blank. Step 5: Fixed-length cutting. After the extruded PPS tube blank is cooled, it is drawn and cut to a preset length to obtain a fixed-length PPS tube.

Images