A cross-linking extruder

Abstract

The present invention provides a cross-linking extruder, comprising a bottom frame component, a frame, a head frame component, an extrusion part, a heating and water-cooling component, a reduction box, a screw cooling component, a barrel, a splitter plate, and a screw; the bottom frame component is placed on a horizontal plane to support the equipment; the frame is fixedly installed above the bottom frame component; one end of the reduction box is connected to the screw cooling component, and the other end is connected to the extrusion part; the surface of the extrusion part is wrapped with a heating and water-cooling component; the extrusion part includes a barrel, a splitter plate, and a screw; the screw is installed in the barrel, one end is installed with a distance d from the splitter plate, and this end is a ball head structure; the side of the splitter plate opposite to the screw is set to a spherical structure; the barrel is connected to the reduction box. The extruder can solve the problems of poor plasticizing quality and short continuous working cycle caused by inaccurate temperature control.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic processing equipment, and in particular relates to a cross-linking extruder. Background Art

[0002] The single-screw extruder is composed of an Archimedean screw rotating in a heated barrel. It is widely used due to its simple structure, easy manufacturing, high processing efficiency and low price. It is the most mature and most used type of extruder. However, there are still some problems with conventional extruders during production, such as the inability to accurately control the extruder discharge temperature. The XLPE material used in the cross-linking production equipment has high requirements for the stability of the process temperature, which leads to the generation of coked particles due to pre-cross-linking of the material after about a week of startup, and eventually blockage and shutdown to reduce production; there are also technical problems such as poor plasticization quality caused by the failure to stably adjust the water inlet of the water jacket, inaccurate and unstable temperature control and water cooling devices in the heating section. Summary of the invention

[0003] Technical solution: In order to solve the above-mentioned technical problems, a cross-linking extruder provided by the present invention can solve the technical problems such as poor plasticizing quality and short continuous working cycle caused by the above-mentioned inaccurate temperature control, and specifically comprises: a bottom frame component, a frame, a head frame component, an extrusion part, a heating and water-cooling component, a reduction gear box, a screw cooling component, a barrel, a diverter plate, and a screw; the bottom frame component is placed on a horizontal plane for supporting the equipment; the frame is fixedly installed above the bottom frame component; one end of the reduction gear box is connected to the screw cooling component, and the other end is connected to the extrusion part; a heating and water-cooling component is wrapped around the surface of the extrusion part; wherein the extrusion part comprises a barrel, a diverter plate, and a screw; the screw is installed in the barrel, and one end is installed at a distance d from the diverter plate and this end is a ball head type structure; the side of the diverter plate opposite to the screw is set to a spherical structure; the barrel is connected to the reduction gear box.

[0004] As an improvement, the barrel is a cylinder structure with a double spiral groove on the surface; the heating water cooling component includes an inlet pipe and a return pipe, two inlet pipes are provided, each independently installed in the double spiral groove, the inlet pipe is connected to the cooling water and the water in the two inlet pipes flows in reverse; the return pipe is installed at the bottom of the inlet pipe.

[0005] As an improvement, the heating and water cooling component also includes a heater, a stop valve and a solenoid valve; the heater is installed in different areas on the outer wall of the barrel, and is set at the left front, right front, left rear and right rear positions; the stop valve and solenoid valve are installed at both ends of the return pipe.

[0006] As an improvement, it further comprises a pressing block and a metal hose, wherein the pressing block is installed above the heater and the metal hose is installed at the end of the stop valve, wherein the heater is a cast aluminum heater.

[0007] As an improvement, it also includes a temperature gauge base and a temperature gauge. The temperature gauge base is fixedly installed at the water inlet pipe port position at each screw groove on the barrel and is used for fixedly installing the temperature gauge.

[0008] As an improvement, the extrusion part includes a feeding section, a compression section, a BM-type screw section, a metering section, and a mixing section in sequence from the feeding to the discharging direction; the feeding section is used for feeding, and the length is set to be the same as the length of the compression section; the BM-type screw section is provided with two groups, which are installed continuously and are both provided with two groups of screw grooves; the metering section is installed before the mixing section, and the screw is arranged to rotate one circle so that the mixing can be equidistant and equal in depth; the mixing section is installed at the conveying end.

[0009] As an improvement, the BM section is provided with three sections, and the set lengths are 1200-1500:500-700:500-700, and the screw adopts a BM type screw to ensure uniform plasticization.

[0010] As an improvement, the screw cooling component includes a constant temperature water inlet pipe, a return pipe, a stop rod, and a clamp; the constant temperature water inlet pipe is connected to the thermostat for water inlet; the return pipe is installed on one side of the constant temperature water inlet pipe; the stop rod is connected to the clamp and installed at the end of the screw.

[0011] As an improvement, it also includes a disassembly wrench, a rotary joint and a reducing elbow; one end of the rotary joint is connected to the end of the screw, the clamp is fixedly installed on the rotary joint, one end of the reducing elbow is connected to the other end of the rotary joint, and the disassembly wrench is used to disassemble the joint at the end of the screw.

[0012] Beneficial effect: Compared with the conventional extruder, the cross-linking extruder proposed in the present invention is improved in the present invention, specifically by setting a multi-stage screw structure, in which the BM segment is set as a three-stage BM type screw head structure, and the length is set to 1200-1500:500-700:500-700, compared with the conventional one, the plasticization is more uniform.

[0013] In addition, the present invention is the first to arrange the metering section before the mixing section. By equidistant and equal-depth arrangement of the screw fins on the screw, accurate metering is performed before mixing and outputting. This can solve the problem of pre-cross-linked particles being easily generated and the outlet being blocked after continuous startup. This can replace the conventional shutdown after startup for one week. The present invention can achieve continuous startup for half a month or even a month without interruption.

[0014] At the same time, in the present invention, the sides of the diverter plate and the screw rod are both set to a spherical structure, and the relative distance is constant, both 8-15 cm. Compared with the output of 300 kg / h of a conventional extruder, the output of the present invention is increased to 600 kg / h, truly achieving high efficiency and high output. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the whole machine of the present invention.

[0016] Figure 2 It is a schematic diagram of the structure at the end of the barrel of the present invention.

[0017] Figure 3 It is a schematic diagram of the structure of the heating water cooling component of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the screw cooling component of the present invention.

[0019] In the figure: bottom frame component 1, frame 2, head frame component 3, extrusion part 4, heating water cooling component 5, reduction box 6, screw cooling component 7, barrel 8, diverter plate 9, screw 10, water inlet pipe 11, return pipe 12, heater 13, stop valve 14, solenoid valve 15, metal hose 16, thermometer base 17, constant temperature water inlet pipe 18, return pipe II 19, anti-rotation rod 20, clamp 21, swivel joint 22, reducing elbow 23. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below so that those skilled in the art can better understand the advantages and features of the present invention, thereby making a clearer definition of the protection scope of the present invention. The embodiments described in the present invention are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0021] See Figure 1As shown, the cross-linking extruder of the present invention comprises a bottom frame component 1, a frame 2, a head frame component 3, an extrusion part 4, a heating and water-cooling component 5, a reduction box 6, a screw cooling component 7, a barrel 8, a diverter plate 9, and a screw 10; the bottom frame component 1 is placed on a horizontal plane for supporting the equipment; the frame 2 is fixedly installed above the bottom frame component 1; one end of the reduction box 6 is connected to the screw cooling component 7, and the other end is connected to the extrusion part 4; the surface of the extrusion part 4 is wrapped with a heating and water-cooling component 5; wherein the extrusion part 4 comprises a barrel 8, a diverter plate 9, and a screw 10; the screw 10 is installed in the barrel 8, one end of which is installed at a distance d from the diverter plate 9 and this end is a ball head type structure; the side of the diverter plate 9 opposite to the screw is set to a spherical structure; the barrel 8 is connected to the reduction box 6.

[0022] In the present invention, the reduction box 6 is a three-stage reduction gear, and adopts involute helical cylindrical gear transmission. The gears are integrally carburized and quenched hardened gears with large bearing pressure. All pairs of gears and bearings are pressure lubricated.

[0023] See Figure 2 As shown, the barrel 8 is a cylinder structure with a double screw groove on the surface; the heating water cooling component 5 includes an inlet pipe 11 and a return pipe 12, two inlet pipes 11 are provided, each independently installed in the double screw groove, the inlet pipe 11 is connected to the cooling water and the water in the two inlet pipes 11 flows in the opposite direction; the return pipe 12 is installed at the bottom of the inlet pipe 11.

[0024] In the present invention, the screw is connected to the inner hole on the output shaft of the reduction box through an involute spline, the output shaft on the reduction box drives the screw to rotate, and the spiral groove with a gradual depth change from the feeding section to the homogenizing section on the screw conveys, compresses, plasticizes and extrude the material forward.

[0025] See Figure 3 As shown, the heating water cooling component 5 also includes a heater 13, a stop valve 14 and a solenoid valve 15; the heater 13 is installed in different areas on the outer wall of the barrel 8, and is set at the left front, right front, left rear and right rear positions; the stop valve 14 and the solenoid valve 15 are installed at the two ends of the return pipe 12 to control the cooling water flow and adjust the temperature of each zone.

[0026] The present invention further comprises a pressing block and a metal hose 16 , wherein the pressing block is installed above the heater 13 , and the metal hose 16 is installed at the end of the stop valve 14 , wherein the heater 13 is a cast aluminum heater.

[0027] Furthermore, it also includes a temperature gauge base 17 and a temperature gauge. The temperature gauge base 17 is fixedly installed at the port position of the water inlet pipe 11 at each screw groove on the barrel 8, and is used for fixedly installing the temperature gauge.

[0028] In the present invention, the extrusion part 4 includes a feeding section, a compression section, a BM type screw section, a metering section, and a mixing section in sequence from the feeding to the discharging direction; the feeding section is used for feeding, and the length set is the same as the length of the compression section; the BM type screw section is provided with two groups, which are installed continuously and are both provided with two groups of screw grooves; the metering section is installed before the mixing section, and the screw is arranged to rotate one circle so that the mixing can be equidistant and equal in depth; the mixing section is installed at the conveying end.

[0029] Furthermore, the BM section is provided with three sections, and the set lengths are 1200-1500:500-700:500-700, and the screw adopts a BM type screw to ensure uniform plasticization.

[0030] In the present invention, the BM type screw is based on the melting law of the material in the screw groove, and an additional thread that acts as a barrier is added to the melting section of the screw. The two threads divide the screw groove formed by the original thread into two screw grooves, one screw groove is connected to the feeding section screw groove, and the other screw groove is connected to the homogenizing section. The former is used to hold the solid phase, and the latter is used to hold the liquid phase. Due to the different pitches of the main and secondary threads, the liquid phase screw groove gradually widens from zero until it reaches the width of the entire screw groove of the homogenizing section, but its screw groove depth remains unchanged. The solid phase screw groove narrows from wide to narrow, and its width becomes zero in the homogenizing section, but its screw groove depth gradually changes from the screw groove depth of the feeding section to the screw groove depth of the homogenizing section.

[0031] In short, the solid and liquid phases begin to separate at the point where the width of the liquid phase screw groove is zero, and melting is completed at the point where the width of the solid phase screw groove is zero. All the molten materials are homogenized in the homogenization section and squeezed into the die at a constant pressure, quantity and temperature.

[0032] See Figure 4 As shown, the screw cooling component 7 includes a constant temperature water inlet pipe 18, a return pipe 19, a stop rod 20, and a clamp 21; the constant temperature water inlet pipe 18 is connected to the thermostat for water inlet; the return pipe 19 is installed on one side of the constant temperature water inlet pipe 18; the stop rod 20 is connected to the clamp 21 and installed at the end of the screw.

[0033] The present invention also includes a disassembly wrench, a rotary joint 22 and a reducing elbow 23; one end of the rotary joint 22 is connected to the end of the screw, the clamp 21 is fixedly installed on the rotary joint 22, one end of the reducing elbow 23 is connected to the other end of the rotary joint 22, and the disassembly wrench is used to disassemble the joint at the end of the screw.

[0034] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A cross-linking extruder, characterized in that: The invention comprises a bottom frame component (1), a frame (2), a head frame component (3), an extrusion part (4), a heating and water cooling component (5), a reduction box (6), a screw cooling component (7), a barrel (8), a diverter plate (9), and a screw (10); the bottom frame component (1) is placed on a horizontal plane for supporting the equipment; the frame (2) is fixedly installed above the bottom frame component (1); one end of the reduction box (6) is connected to the screw cooling component (7), and the other end is connected to the extrusion part (4); the surface of the extrusion part (4) is wrapped with a heating and water cooling component (5); the extrusion part (4) comprises a barrel (8), a diverter plate (9), and a screw (10); the screw (10) is installed in the barrel (8), one end of which is installed at a distance d from the diverter plate (9) and the end is a ball head structure; the side of the diverter plate (9) opposite to the screw is set as a spherical structure; the barrel (8) is connected to the reduction box (6); The extrusion part (4) includes a feeding section, a compression section, a BM type screw section, a metering section, and a mixing section in order from the feeding to the discharging direction; the feeding section is used for feeding, and the length thereof is set to be the same as that of the compression section; the BM type screw section is provided with two groups, which are installed continuously and are both provided with two groups of screw grooves; the metering section is installed before the mixing section, and the screw is arranged to rotate one circle so that the mixing can be equidistant and equal in depth; the mixing section is installed at the conveying end; The BM type screw segment is provided with three segments, and the lengths thereof are set to be 1200-1500: 500-700: 500-700. The screw adopts the BM type screw to ensure uniform plasticization; The screw cooling component (7) comprises a constant temperature water inlet pipe (18), a second return pipe (19), a stop rod (20), and a clamp (21); the constant temperature water inlet pipe (18) is connected to the thermostat for water inlet; the second return pipe (19) is installed on one side of the constant temperature water inlet pipe (18); the stop rod (20) is connected to the clamp (21) and installed at the end of the screw; It also includes a disassembly wrench, a rotary joint (22) and a reducer elbow (23); one end of the rotary joint (22) is connected to the end of the screw rod, the clamp (21) is fixedly mounted on the rotary joint (22), one end of the reducer elbow (23) is connected to the other end of the rotary joint (22); the disassembly wrench is used to disassemble the joint at the end of the screw rod; The screw is connected to the inner hole of the output shaft of the reduction box through an involute spline. The output shaft of the reduction box drives the screw to rotate. The spiral groove with a gradual depth change from the feeding section to the homogenizing section on the screw conveys, compresses, plasticizes and extrude the material forward. The barrel (8) is a barrel structure, and a double screw groove is arranged on the surface; The heating water cooling component (5) comprises a water inlet pipe (11) and a water return pipe (12); two water inlet pipes (11) are provided and are independently installed in the double screw groove; the water inlet pipe (11) is connected to the cooling water and the water in the two water inlet pipes (11) flows in opposite directions; the water return pipe (12) is installed at the bottom of the water inlet pipe (11); The heating and water cooling component (5) further comprises a heater (13), a stop valve (14) and a solenoid valve (15); the heater (13) is installed on the outer wall of the barrel (8) in different regions, and is arranged at the left front, right front, left rear and right rear positions; The stop valve (14) and the solenoid valve (15) are installed at two ends of the return pipe (12).

2. The cross-linking extruder according to claim 1, characterized in that: It also includes a pressing block and a metal hose (16), wherein the pressing block is installed above the heater (13), and the metal hose (16) is installed at the end of the stop valve (14), wherein the heater (13) is a cast aluminum heater.

3. The cross-linking extruder according to claim 1, characterized in that: It also includes a temperature gauge base (17) and a temperature gauge. The temperature gauge base (17) is fixedly mounted on the port position of the water inlet pipe (11) at each screw groove on the barrel (8) and is used for fixedly mounting the temperature gauge.

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