Die head mechanism for negative pressure extruded sheet production and production line

Abstract

The invention discloses a die head mechanism for negative pressure extruded sheet production and a production line, and belongs to the technical field of extruded sheet negative pressure foaming production. The die head mechanism for producing the negative pressure extruded sheet comprises an extrusion die head main body, a die head shell and a lengthened rotating rod, wherein the die head shell is arranged on the periphery of the extrusion die head main body in a sealing and covering manner; the lengthened rotating rods and the adjusting bolts of the extrusion die head body are identical in number and are arranged in a one-to-one correspondence mode, the lengthened rotating rods penetrate through the die head shell wall plate in a sealed mode, and the inner ends of the lengthened rotating rods are in driving connection with bolt heads of the adjusting bolts. Torque is transmitted to the adjusting bolt through the lengthened rotating rod, the lengthened rotating rod and the die head shell are effectively sealed, the sealing performance is good, and the opening degree of an extrusion opening can be conveniently adjusted on line.

Description

Technical Field

[0001] The invention relates to the technical field of negative pressure foaming production of extruded boards, in particular to a die head mechanism and a production line for producing negative pressure extruded boards. Background Art

[0002] At present, the production of polystyrene insulation boards is often carried out under normal pressure. The equipment on the production line is from front to back: extruder, mold, leveling device, drawing machine, conveyor rack, etc., all installed in the workshop under normal pressure for production. The extruder and the mold are connected by bolts through a blue plate. When the polystyrene material and the foaming agent come out of the mold, the polystyrene material has initially taken a flat shape due to foaming and expansion, and enters the leveling device to make it further flat, and then enters the drawing machine and conveyor rack in sequence. This device for producing polystyrene insulation boards, because the polystyrene insulation board is produced under normal pressure, its foaming is not sufficient, the specific gravity of the insulation board material is high, and a large amount of raw materials are wasted.

[0003] The invention patent with the publication number CN114161743A discloses a XPS extruded board vacuum foaming production line, which relates to the field of vacuum foaming. The production line uses the principle of vacuum foaming and is designed with negative pressure production to improve the foaming rate of XPS raw materials, while effectively reducing production costs. It includes a main machine, one side of the main machine is connected to a twin-screw feeder, the discharge port of the main machine is connected to a closed shaping table, the discharge port of the closed shaping table is connected to a closed multi-roller tractor, the discharge port of the closed multi-roller tractor is connected to a closed conveyor frame through a floating joint, the discharge port of the closed conveyor frame is connected to an XPS longitudinal trimming machine, and the discharge port of the XPS longitudinal trimming machine is connected to an XPS cross-cutting saw; the bottom of the closed shaping table and the closed multi-roller tractor are jointly equipped with a movable guide rail. In the patented technical solution, the foaming mold is connected to the closed molding table through the foaming mold connecting plate at the rear end. However, the actual situation is that there are movable upper and lower molds above and below the extrusion port of the foaming mold. There is a sliding gap between the upper and lower molds and the mold shell, resulting in the gap between the foaming mold connecting plate and the foaming mold often cannot be effectively sealed, resulting in a decrease in the vacuum degree.

[0004] The utility model patent with the publication number CN200995467Y discloses a transverse negative pressure foaming device for extruded polystyrene insulation board. The extruder and the mold are connected by a flange, followed by a leveling device, a drawing machine, and a conveyor. The mold, the leveling device, the drawing machine, and the conveyor are installed in a transverse sealing box; an insulation board outlet is provided at the end of the transverse sealing box, and a baffle is installed on the insulation board outlet. The baffle fits tightly with the insulation board outlet edge, and the baffle is in dynamic sealing contact with the insulation board outlet; at least one hole is provided on the box wall of the transverse sealing box, and is sealed and connected to the hole through a vacuum device. However, the mold is installed in the transverse sealing box, which is not conducive to online adjustment of the extrusion port opening of the mold. Even if two doors are provided, it may be necessary to repeatedly vacuum the negative pressure during adjustment, which is very inconvenient.

[0005] Therefore, it is necessary to develop a die head mechanism for producing negative pressure extruded boards in view of the above-mentioned defects. Summary of the invention

[0006] The purpose of the present invention is to provide a die head mechanism for producing negative pressure extruded boards, which uses an extended rotating rod to transmit torque to an adjusting bolt, and the extended rotating rod and the die head housing are effectively sealed, have good sealing performance and are convenient for online adjustment of the extrusion port opening.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention discloses a die head mechanism for producing negative pressure extruded boards, comprising an extrusion die head body, a die head shell and an extended rotating rod, wherein a sealing cover of the die head shell is arranged on the periphery of the extrusion die head body; the number of adjustment bolts of the extended rotating rod and the extrusion die head body is consistent and they are arranged in a one-to-one correspondence, the extended rotating rod seal passes through the die head shell wall panel, and the inner end of the extended rotating rod drives the bolt head connected to the adjustment bolt.

[0009] Furthermore, the extended rotating rod is a cylindrical rod, and hexagonal prism heads are coaxially arranged at both ends of the extended rotating rod, and the hexagonal prism head at the inner end is inserted into the bolt head of the adjusting bolt.

[0010] Furthermore, the die head shell is a square frame-shaped cover shell with openings at both ends, a transfer plate for sealingly connecting to the extruder is arranged at the front end of the die head shell, and a rear end plate for sealingly connecting to the leveling device is arranged at the rear end of the die head shell.

[0011] Furthermore, it also includes a sealing plate, two of which are screwed to the top and bottom surfaces of the die head shell, and the sealing plate is provided with a vertical through hole at the position where the extended rotating rod passes through; the inner wall of the vertical through hole is provided with a sealing ring groove and a sealing member is installed.

[0012] Furthermore, the number of the sealing ring grooves is two and they are respectively arranged at the upper and lower ends of the vertical through hole. The sealing member is an O-ring, and the O-ring seals the gap between the extended rotating rod and the vertical through hole.

[0013] Furthermore, the number of the sealing ring grooves is two and they are respectively arranged at the upper and lower ends of the vertical through hole. The sealing member adopts a Y-shaped sealing ring. The two Y-shaped sealing rings are arranged face to face. The Y-shaped sealing ring seals the gap between the extended rotating rod and the vertical through hole.

[0014] Furthermore, it also includes a guide ring and an oil pressure component, two of the guide rings form a group, and a group of guide rings is arranged in each vertical through hole; the two guide rings are respectively arranged on the inner sides of the Y-shaped sealing rings, and the guide rings guide the smooth outer wall surface of the extended rotating rod; the oil pressure component supplies lubricating oil to the sealing cavity between the two Y-shaped sealing rings.

[0015] Furthermore, the number of the oil pressure components is multiple, and a group of the oil pressure components is set in a group of vertical through holes that are close to each other; the oil pressure components include an oil channel group, a one-way valve and a wire plug; the oil channel group is opened on the sealing plate and includes an oil guide ring groove, an oil channel and an oil inlet pipe joint; the oil guide ring groove is coaxially opened in the middle position of the vertical through hole; the inner end of the oil channel is connected to a group of all the oil guide ring grooves, and the outer port of the oil channel is connected to the oil inlet pipe joint for introducing pressurized lubricating oil; the one-way valve is set on the hole of the oil channel close to the oil inlet pipe joint, and the wire plug seals the exhaust channel of the oil channel.

[0016] Furthermore, the oil pressure assembly also includes a pressure gauge, which is installed on the oil channel and located behind the one-way valve.

[0017] The present invention provides a negative pressure extruded board production line, comprising an automatic feeder, an extruder, a leveling device, a traction device, a conveying frame group and a post-processing equipment group which are connected in sequence from the front, and also comprising a sealing cylinder, a water pool and an exhaust device, wherein the die head mechanism for producing the negative pressure extruded board described in any one of the above items is installed between the extruder and the leveling device; a sealing cover shell connected to the die head shell is arranged outside the leveling device and the traction device, and the exhaust port of the exhaust device is connected to the pipe joint of the sealing cover shell; the front end of the sealing cylinder is sealingly connected to the sealing cover shell interface at the rear end of the traction device, and the front end of the conveying frame group is connected to the output end of the traction device and is sealed in the sealing cylinder; the rear end of the sealing cylinder is bent downward to enter the water pool and immersed below the liquid level; the rear end of the conveying frame group is then output backward and upward to the post-processing equipment group.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are:

[0019] The die head mechanism for producing negative pressure extruded boards of the present invention can achieve a good sealing effect and avoid air leakage by arranging a die head shell on the periphery of the extrusion die head body for sealing; an extended rotating rod is arranged to rotate the inner adjustment bolt, so that even in the case of negative pressure inside, the extrusion port opening can be adjusted without opening or disassembling the die head shell. The die head mechanism for producing negative pressure extruded boards of the present invention uses an extended rotating rod to transmit torque to the adjustment bolt, and the extended rotating rod and the die head shell are effectively sealed, with good sealing performance and convenient online adjustment of the extrusion port opening.

[0020] Moreover, by setting the extended rotating rod as a cylindrical rod, it is convenient to set the sealing member to form a good seal. By setting the hexagonal prism heads at both ends, it is convenient to insert it into the bolt head of the adjusting bolt, and the outer end is convenient to be rotated using a socket wrench. By setting the die head shell as a flat square frame-shaped cover with openings at both ends, it is convenient to output the extruded board blank output from the extrusion port to the leveling device backward. By setting the adapter plate and the rear end plate, it is convenient to achieve a sealed connection of the die head shell. By adding sealing plates on the top and bottom surfaces of the die head shell, the height of the vertical through hole is increased, which is convenient for installing the sealing member; by setting O-rings at the upper and lower ends of the vertical through hole to seal the gap between the extended rotating rod and the vertical through hole, double sealing can improve the sealing effect and prevent external air from entering the inner cavity of the die head shell.

[0021] In addition, the Y-shaped sealing ring is used for sealing. Compared with the use of O-shaped ring for sealing, the negative pressure inside the die head shell can be used to assist in pressing the lip of the Y-shaped sealing ring, so that it fits more closely with the outer wall of the extended rotating rod, especially the inner Y-shaped sealing ring, which improves the sealing performance to a certain extent. By adding a guide belt ring, the two guide belt rings are separated by a distance to guide and support the outer wall of the extended rotating rod, avoiding contact between it and the edge of the vertical through hole, reducing scratches. At the same time, the oil pressure component supplies pressurized lubricating oil to the sealing cavity between the two Y-shaped sealing rings, which can better open the outer lip of the Y-shaped sealing ring, forming a sealing cavity between the negative pressure cavity inside the die head shell and the normal pressure air of the external environment, and can obtain better sealing performance. At the same time, the lubricating oil can lubricate the friction pair between the guide belt ring and the extended rotating rod to reduce wear. By setting multiple groups of the oil pressure components on the upper and lower sealing plates, combined with the pressure gauge, if the pressure gauge in that group is found to be depressurized, the leaking position can be quickly located, which is convenient for rapid maintenance and recovery. By opening an oil guide ring groove with an increased diameter in the middle of the vertical through hole, the adjacent vertical through hole oil pressure sealing cavities can be interconnected, which is convenient for synchronous pressurization and synchronous monitoring. The one-way valve and the plug are arranged to make the oil inlet smoother and avoid oil return.

[0022] The negative pressure extruded board production line of the present invention can achieve better sealing and prevent air leakage at the outlet by water sealing the outlet end of the sealing cylinder through a deep water pool; and can form a stable negative pressure environment for the curing section of the extruded board by sealing after the die head, the leveling device and the traction device are integrally connected, thereby ensuring that the negative pressure foaming proceeds smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of the negative pressure extruded board production line of the present invention;

[0025] Figure 2 It is a schematic diagram of the main structure of the die head mechanism for producing the negative pressure extruded board of the present invention;

[0026] Figure 3 It is a left-side structural schematic diagram of the die head mechanism for producing negative pressure extruded boards of the present invention;

[0027] Figure 4 It is a schematic diagram of the top view of the die head mechanism for producing the negative pressure extruded board of the present invention;

[0028] Figure 5 for Figure 6 Schematic diagram of the cross-sectional structure of the middle AA part;

[0029] Figure 6 It is a cross-sectional structural schematic diagram of another embodiment of the extended rotating rod sealing part of the die head mechanism for producing negative pressure extruded board of the present invention;

[0030] Figure 7 for Figure 6 A schematic diagram of the top view of the sealing plate portion of the embodiment.

[0031] Explanation of the reference numerals: 1. extrusion die body; 101. upper die; 102. lower die; 103. adjustment bolt; 2. die housing; 201. adapter plate; 202. rear end plate; 203. window; 204. rib plate; 205. sealing gasket; 3. extended rotating rod; 301. hexagonal prism head; 4. sealing plate; 401. oil guide ring groove; 402. oil channel; 403. oil inlet pipe joint; 5. cap screw; 6. O-ring; 7. Y-type sealing ring; 8. guide belt ring; 9. one-way valve; 10. screw plug; 11. pressure gauge; 12. extruder; 13. leveling device; 14. traction device; 15. post-processing equipment group; 16. sealing cylinder; 17. water tank; 18. conveying frame group. DETAILED DESCRIPTION

[0032] The core of the present invention is to provide a die head mechanism for producing negative pressure extruded boards, which uses an extended rotating rod to transmit torque to an adjusting bolt. The extended rotating rod and the die head housing are effectively sealed, have good sealing performance and are convenient for online adjustment of the extrusion port opening.

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] With reference to the accompanying drawings, Figure 1 This is a schematic diagram of the structure of the negative pressure extruded board production line of the present invention; Figure 2 It is a schematic diagram of the main structure of the die head mechanism for producing the negative pressure extruded board of the present invention; Figure 3 It is a left-side structural schematic diagram of the die head mechanism for producing negative pressure extruded boards of the present invention; Figure 4 It is a schematic diagram of the top view of the die head mechanism for producing the negative pressure extruded board of the present invention; Figure 5 for Figure 6 Schematic diagram of the cross-sectional structure of the middle AA part; Figure 6 It is a cross-sectional structural schematic diagram of another embodiment of the extended rotating rod sealing part of the die head mechanism for producing negative pressure extruded board of the present invention; Figure 7 for Figure 6 A schematic diagram of the top view of the sealing plate portion of the embodiment.

[0036] Example 1

[0037] In a specific embodiment, Figures 1 to 5 As shown, a die head mechanism for producing negative pressure extruded boards includes an extrusion die head body 1, a die head shell 2 and an extended rotating rod 3, and a sealing cover of the die head shell 2 is arranged on the periphery of the extrusion die head body 1. The extrusion die head body 1 includes an upper die 101, a lower die 102 and a die shell, and a plurality of adjustment bolts 103 are respectively arranged on the upper and lower sides of the die shell for adjusting the extrusion port opening between the upper die 101 and the lower die 102. The number of the adjustment bolts 103 of the extended rotating rod 3 and the extrusion die head body 1 is the same and they are arranged one by one. The extended rotating rod 3 seals through the wall plate of the die head shell 2, and the inner end of the extended rotating rod 3 drives the bolt head connected to the adjustment bolt 103, that is, the extended rotating rod 3 can drive the adjustment bolt 103 to rotate.

[0038] By arranging a die housing 2 on the periphery of the extrusion die main body 1 for sealing, a better sealing effect can be achieved to avoid air leakage; by arranging an extended rotating rod 3 to rotate the inner adjustment bolt 103, the extrusion port opening can be adjusted without opening or disassembling the die housing 2 even when the inner side is under negative pressure. The die mechanism for producing negative pressure extruded boards of the present invention uses an extended rotating rod to transmit torque to the adjustment bolt, and the extended rotating rod and the die housing are effectively sealed, with good sealing performance and convenient online adjustment of the extrusion port opening.

[0039] In a specific implementation of this embodiment, Figure 3 and Figure 4 As shown, the extended rotating rod 3 is a cylindrical rod, and the two ends of the extended rotating rod 3 are coaxially provided with hexagonal prism heads 301, and the inner end hexagonal prism head 301 is inserted into the bolt head of the adjusting bolt 103. That is, the adjusting bolt 103 is a cylindrical head hexagon socket bolt.

[0040] Specifically, an elastic retaining ring for the shaft is installed at the inner end of the extended rotating rod 3 to prevent the extended rotating rod 3 from falling off from the wall plate hole of the die head housing 2.

[0041] By setting the extended rotating rod 3 as a cylindrical rod, it is convenient to set the sealing member to form a good seal. By setting the hexagonal prism heads 301 at both ends, it is convenient to insert it into the bolt head of the adjusting bolt 103, and the outer end is convenient to be rotated using a socket wrench.

[0042] In a specific implementation of this embodiment, Figures 2 to 5 As shown, the die housing 2 is a flat square-shaped housing with two ends open, and the front end of the die housing 2 is provided with an adapter plate 201 for sealingly connecting the extruder 12, and the rear end of the die housing 2 is provided with a rear end plate 202 for sealingly connecting the leveling device 13. Sealing gaskets 205 are respectively provided on the flange connection surfaces of the adapter plate 201 and the rear end plate 202.

[0043] Specifically, if Figures 2 to 4 As shown, windows 203 are provided on both side walls of the die housing 2. The windows 203 are made of organic glass and correspond to the rear of the extrusion port. Ribs 204 are provided on the outer surfaces of the top and bottom walls of the flat die housing 2 along the length direction. The ribs 204 can increase the structural strength of the top and bottom walls of the die housing 2.

[0044] By setting the die housing 2 as a flat square frame-shaped cover with openings at both ends, the extruded sheet blank output from the extrusion port is conveniently output to the flattening device 13. The adapter plate 201 and the rear end plate 202 are arranged to facilitate the sealing connection of the die housing 2.

[0045] Specifically, if Figures 2 to 5As shown, the die head mechanism for producing negative pressure extruded boards of the present invention also includes a sealing plate 4. Two sealing plates 4 are respectively screwed to the top and bottom surfaces of the die head housing 2. A waist-shaped hole is provided on the sealing plate 4. A large cap screw 5 passes through the waist-shaped hole and is threadedly connected to the threaded hole of the die head housing 2. The threaded hole here is a blind hole. In order to reduce the wall thickness of the die head housing 2, a thickening pad can be welded below the threaded hole. The sealing plate 4 is provided with a vertical through hole at the position where the extended rotating rod 3 passes through. The diameter of the vertical through hole is larger than the outer diameter of the extended rotating rod 3. The inner wall of the vertical through hole is provided with a sealing ring groove and a sealing member is installed.

[0046] Specifically, if Figure 5 As shown, there are two sealing ring grooves which are respectively arranged at the upper and lower ends of the vertical through hole. The sealing member is an O-ring 6 which seals the gap between the extended rotating rod 3 and the vertical through hole.

[0047] By adding sealing plates 4 on the top and bottom surfaces of the die housing 2, the height of the vertical through hole is increased, which facilitates the installation of the seal; by respectively setting O-rings 6 at the upper and lower ends of the vertical through hole to seal the gap between the extended rotating rod 3 and the vertical through hole, double sealing can improve the sealing effect and prevent external air from entering the inner cavity of the die housing 2.

[0048] The working principle of the die head mechanism for producing the negative pressure extruded board in this embodiment: During the normal negative pressure foaming production process, if the thickness specification of the produced extruded board needs to be adjusted, a socket wrench is used to sequentially sleeve the hexagonal prism head 301 at the top of the extended rotating rod 3 and rotate it, driving the corresponding adjustment bolt 103 to rotate, thereby adjusting the position of the upper die 101 and the lower die 102, and changing the extrusion port opening. Of course, in order to ensure the consistency of the adjustment, the conveying gap of the leveling device 13 and the traction device 14 behind is also adjusted. The adjustment process is visually observed through the window 203.

[0049] In summary, the die head mechanism for producing negative pressure extruded boards in this embodiment can achieve a good sealing effect and avoid air leakage by setting a die head shell 2 on the periphery of the extrusion die head body 1 for sealing; by setting an extended rotating rod 3 to rotate the inner adjustment bolt 103, the extrusion port opening can be adjusted without opening or disassembling the die head shell 2 in the case of negative pressure on the inner side. The die head mechanism for producing negative pressure extruded boards of the present invention uses an extended rotating rod to transmit torque to the adjustment bolt, and the extended rotating rod and the die head shell are effectively sealed, with good sealing performance and convenient for online adjustment of the extrusion port opening. In addition, by setting the extended rotating rod 3 as a cylindrical rod, it is convenient to set a sealing member to form a good seal, and by setting a hexagonal prism head 301 at both ends, it is convenient to insert it into the bolt head of the adjustment bolt 103, and the outer end is convenient to use a socket wrench for rotation. By setting the die head shell 2 as a flat square frame-shaped cover with openings at both ends, it is convenient for the extruded board blank output from the extrusion port to be output backward to the leveling device 13. The adapter plate 201 and the rear end plate 202 are provided to facilitate the sealed connection of the die housing 2. By adding sealing plates 4 on the top and bottom surfaces of the die housing 2, the height of the vertical through hole is increased, which facilitates the installation of the seal; by respectively providing O-rings 6 at the upper and lower ends of the vertical through hole to seal the gap between the extended rotating rod 3 and the vertical through hole, double sealing can improve the sealing effect and prevent external air from entering the inner cavity of the die housing 2.

[0050] Example 2

[0051] This embodiment is formed by making a secondary improvement to the sealing performance of the installation part of the extended rotating rod 3 on the basis of the above-mentioned embodiment 1. In the above-mentioned embodiment 1, because there is a gap between the extended rotating rod 3 and the vertical through hole, when the operator uses a socket wrench to rotate the extended rotating rod 3, not only torque is applied to the extended rotating rod 3, but also bending moment is inevitably applied to the extended rotating rod 3, which often causes the outer wall of the extended rotating rod 3 and the orifice of the vertical through hole to scrape and cause scratches on the outer wall of the extended rotating rod 3. If the scratch position contacts the O-ring 6, it will cause air leakage, which will cause the negative pressure parameter control to fail in severe cases, and the product quality will fluctuate.

[0052] In a specific implementation of this embodiment, Figure 6 As shown, there are two sealing ring grooves which are respectively arranged at the upper and lower ends of the vertical through hole. The sealing member adopts a Y-shaped sealing ring 7. The two Y-shaped sealing rings 7 are arranged face to face. The Y-shaped sealing rings 7 seal the gap between the extended rotating rod 3 and the vertical through hole.

[0053] Obviously, the Y-shaped sealing ring 7 can also be replaced by a V-shaped sealing ring, and similar simple replacement methods all fall within the protection scope of the present invention.

[0054] Compared with using O-ring 6 for sealing, the Y-shaped sealing ring 7 is used for sealing. The negative pressure inside the die head housing 2 can be used to assist in tightening the lip of the Y-shaped sealing ring 7, so that it fits more closely with the outer wall of the extended rotating rod 3, especially the inner Y-shaped sealing ring 7, which improves the sealing performance to a certain extent.

[0055] Specifically, if Figure 6 and Figure 7 As shown, the die head mechanism for producing negative pressure extruded board of the present invention further comprises a guide belt ring 8 and a hydraulic assembly, two guide belt rings 8 form a group, and a group of guide belt rings 8 is arranged in each vertical through hole. The two guide belt rings 8 are respectively arranged on the inner side of the Y-shaped sealing ring 7, and the guide belt ring 8 guides the smooth outer wall surface of the extended rotating rod 3 in the vertical direction. The hydraulic assembly supplies pressurized lubricating oil to the sealing cavity between the two Y-shaped sealing rings 7, and the oil pressure is controlled at 3-5MPa.

[0056] Specifically, if Figure 6 As shown, the guide belt ring 8 is specifically made of a guide belt made of a copper powder polytetrafluoroethylene composite material, and an installation groove is provided on the inner wall of the vertical through hole at the installation position. In order to install the Y-shaped sealing ring 7 and the guide belt ring 8, the thickness of the sealing plate 4 needs to be increased, and the thickness of the sealing plate 4 is not less than 35 mm. At the same time, the surface roughness of the outer wall of the extended rotating rod 3 needs to be controlled above Ra0.8.

[0057] By adding the guide ring 8, the two guide rings 8 are separated by a distance to guide and support the outer wall of the extended rotating rod 3, avoiding contact between the guide ring and the edge of the vertical through hole, and reducing scratches. At the same time, the oil pressure component supplies pressurized lubricating oil to the sealing cavity between the two Y-shaped sealing rings 7, which can better open the outer lip of the Y-shaped sealing ring 7, forming a sealing cavity between the negative pressure cavity inside the die head housing 2 and the normal pressure air of the external environment, and obtaining better sealing performance. At the same time, the lubricating oil can lubricate the friction pair between the guide ring 8 and the extended rotating rod 3 to reduce wear.

[0058] In a specific implementation of this embodiment, Figure 6 and Figure 7As shown, the number of the oil pressure components is multiple, and a group of the oil pressure components is correspondingly arranged for a group of multiple vertical through holes that are close to each other. The oil pressure component includes an oil channel group, a one-way valve 9 and a screw plug 10. The oil channel group is provided on the sealing plate 4 and includes an oil guide ring groove 401, an oil channel 402 and an oil inlet pipe joint 403: the oil guide ring groove 401 is coaxially provided in the middle position of the vertical through hole, and the oil guide ring grooves 401 of two adjacent vertical through holes are connected. The inner end of the oil channel 402 is connected to all the oil guide ring grooves 401 of a group, and the outer end of the oil channel 402 is connected to the oil inlet pipe joint 403 for introducing pressurized lubricating oil. The one-way valve 9 is provided on the hole of the oil channel 402 close to the oil inlet pipe joint 403, and the one-way valve 9 adopts an embedded one-way valve. The screw plug 10 blocks the exhaust channel of the oil channel 402.

[0059] Specifically, the oil pressure assembly further includes a pressure gauge 11 , which is installed on the oil passage 402 and located behind the one-way valve 9 .

[0060] By setting multiple groups of the oil pressure components on the upper and lower sealing plates 4, combined with the pressure gauge 11, if the pressure gauge 11 in that group is found to be depressurized, the leaking position can be quickly located, which is convenient for rapid maintenance and recovery. By opening an oil guide ring groove 401 with an increased diameter in the middle of the vertical through hole, the adjacent vertical through hole oil pressure sealing cavities can be interconnected, which is convenient for synchronous pressurization and synchronous monitoring. By setting the one-way valve 9 and the wire plug 10, the oil inlet is smoother and oil return is avoided.

[0061] The working principle of the die head mechanism for producing negative pressure extruded board in this embodiment: before the negative pressure foaming is carried out to produce extruded board, firstly, the oil pump or pump station is used to fill the oil channel group with oil through the oil inlet pipe joint 403 to connect the quick joint, and the oil is filled slowly. When the exhaust channel is found to be emitting oil upward, the threaded port of the exhaust channel is blocked with the screw plug 10. Continue to pump oil, observe whether the indication of the pressure gauge 11 meets the set range, and stop pumping oil within the range of 3 to 5MPa. Observe whether the indication of the pressure gauge 11 drops. If it is found to drop rapidly, it indicates that there is oil leakage in several vertical through holes corresponding to this group of oil pressure components. At this time, it is necessary to observe whether there are oil stains on the corresponding extended rotating rods 3. If the oil leakage point is found, the sealing ring is replaced in time and reinstalled. The fact that the indication of the pressure gauge 11 does not drop indicates that the seal is intact, and the oil filling of each oil channel group is completed in sequence. During the production process, if it is found that the sealed negative pressure chamber is frequently depressurized and the exhaust equipment is frequently started, each pressure gauge 11 can also be checked to check whether there is leakage at the installation position of the extended rotating rod 3.

[0062] In summary, the die head mechanism for producing negative pressure extruded board in this embodiment adopts Y-shaped sealing ring 7 for sealing. Compared with the use of O-shaped ring 6 for sealing, the negative pressure inside the die head shell 2 can be used to assist in pressing the lip of the Y-shaped sealing ring 7, so that it fits more closely with the outer wall of the extended rotating rod 3, especially the inner Y-shaped sealing ring 7, which improves the sealing performance to a certain extent. By adding the guide belt ring 8, the two guide belt rings 8 are separated by a distance to guide and support the outer wall of the extended rotating rod 3, avoiding contact between it and the edge of the vertical through hole, and reducing scratches. At the same time, the lubricating oil with pressure is supplied to the sealing cavity between the two Y-shaped sealing rings 7 through the oil pressure component, which can better open the outer lip of the Y-shaped sealing ring 7, forming a sealing cavity separated between the negative pressure cavity inside the die head shell 2 and the normal pressure air of the external environment, and can obtain better sealing performance. At the same time, the lubricating oil can lubricate the friction pair between the guide belt ring 8 and the extended rotating rod 3 to reduce wear. By setting multiple groups of the oil pressure components on the upper and lower sealing plates 4, combined with the pressure gauge 11, if the pressure gauge 11 in that group is found to be depressurized, the leaking position can be quickly located, which is convenient for rapid maintenance and recovery. By opening an oil guide ring groove 401 with an increased diameter in the middle of the vertical through hole, the adjacent vertical through hole oil pressure sealing cavities can be interconnected, which is convenient for synchronous pressurization and synchronous monitoring. By setting the one-way valve 9 and the wire plug 10, the oil inlet is smoother and oil return is avoided.

[0063] Example 3

[0064] The present invention also discloses a negative pressure extruded board production line, which is consistent with the existing normal pressure foaming production line and includes an automatic feeder, an extruder 12, a leveling device 13, a traction device 14, a conveyor frame group 18 and a post-processing equipment group 15 that are connected in sequence from the front. The negative pressure extruded board production line of the present invention also includes a sealing cylinder 16, a pool 17 and an exhaust device, and the negative pressure extruded board production die head mechanism in any of the above embodiments is installed between the extruder 12 and the leveling device 13. The leveling device 13 and the traction device 14 are both provided with a sealing cover shell connected to the die head housing 2, and the air extraction port of the exhaust device is connected to the pipe joint of the sealing cover shell, and can be exhausted to form a negative pressure. The front end of the sealing cylinder 16 is sealed and connected to the sealing cover shell interface at the rear end of the traction device 14, and the front end of the conveyor frame group 18 is connected to the output end of the traction device 14 and is sealed in the sealing cylinder 16. The rear end of the sealing cylinder 16 bends downward into the pool 17 and immerses below the liquid surface. When the negative pressure is working, part of the water in the pool 17 climbs up a distance along the inclined section of the sealing cylinder 16. The rear end of the conveying rack group 18 is then output backward and upward to the post-processing equipment group 15, where no sealing is required.

[0065] The deep water pool 17 is used to seal the outlet end of the sealing tube 16, which can achieve better sealing and prevent air leakage at the outlet; the die head, the leveling device 13 and the traction device 14 are integrally connected and sealed, which can form a stable negative pressure environment for the curing section of the extruded board and ensure smooth negative pressure foaming.

[0066] In a specific embodiment of the present invention, Figure 1 As shown, the rear end of the conveying frame group 18 adopts the method of pressing the conveyor belt up and down, and the two parallel conveyor belts clamp and convey the extruded board to prevent it from automatically floating up under the action of water buoyancy and being unable to be continuously conveyed backward. A drying device is also arranged at a high position obliquely upward at the rear end of the conveying frame group 18, and the drying device blows the water stains on the upper and lower surfaces of the extruded board dry.

[0067] Specifically, the post-processing equipment group 15 includes a trimming device, a roughening and grooving device, and a cutting device. The air extraction device includes a combination of a negative pressure fan and a vacuum pump.

[0068] The negative pressure extruded board production line of the present invention allows the production process of the foaming and molding of the polystyrene insulation board to be carried out under negative pressure, and the negative pressure is controlled at 0.02-0.04 MPa. In this way, the polystyrene insulation board can be fully foamed when discharged from the die head extrusion port, and the specific gravity of the insulation board can be reduced from 29 kilograms per cubic meter of insulation board produced at room temperature to about 27 kilograms per cubic meter of negative pressure production, which can reduce the consumption of raw materials and correspondingly reduce the production cost. Due to the particularly full foaming, the quality of the insulation board is also significantly improved.

[0069] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0070] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A die head mechanism for producing negative pressure extruded boards, characterized in that: The invention comprises an extrusion die body (1), a die shell (2) and an extended rotating rod (3); the sealing cover of the die shell (2) is arranged on the periphery of the extrusion die body (1); the number of the adjustment bolts (103) of the extended rotating rod (3) and the extrusion die body (1) are the same and they are arranged in a one-to-one correspondence; the extended rotating rod (3) seals through the wall plate of the die shell (2); the inner end of the extended rotating rod (3) drives the bolt head of the adjustment bolt (103) to be connected.

2. The die head mechanism for producing negative pressure extruded board according to claim 1, characterized in that: The extended rotating rod (3) is a cylindrical rod, and hexagonal prism heads (301) are coaxially arranged at both ends of the extended rotating rod (3), and the hexagonal prism head (301) at the inner end is inserted into the bolt head of the adjusting bolt (103).

3. The die head mechanism for producing negative pressure extruded board according to claim 2, characterized in that: The die head housing (2) is a square frame-shaped housing with openings at both ends. The front end of the die head housing (2) is provided with a transfer plate (201) for sealingly connecting to the extruder (12), and the rear end of the die head housing (2) is provided with a rear end plate (202) for sealingly connecting to the leveling device (13).

4. The die head mechanism for producing negative pressure extruded board according to claim 3, characterized in that: It also includes a sealing plate (4), two sealing plates (4) are respectively screwed to the top surface and the bottom surface of the die head housing (2), and the sealing plate (4) is provided with a vertical through hole at the position where the extended rotating rod (3) passes through; the inner wall of the vertical through hole is provided with a sealing ring groove and a sealing member is installed.

5. The die head mechanism for producing negative pressure extruded board according to claim 4, characterized in that: The number of the sealing ring grooves is two and they are respectively arranged at the upper and lower ends of the vertical through hole. The sealing member is an O-ring (6), and the O-ring (6) seals the gap between the extended rotating rod (3) and the vertical through hole.

6. The die head mechanism for producing negative pressure extruded board according to claim 4, characterized in that: The number of the sealing ring grooves is two and they are respectively arranged at the upper and lower ends of the vertical through hole. The sealing member is a Y-shaped sealing ring (7). The two Y-shaped sealing rings (7) are arranged face to face. The Y-shaped sealing rings (7) seal the gap between the extended rotating rod (3) and the vertical through hole.

7. The die head mechanism for producing negative pressure extruded board according to claim 6, characterized in that: It also includes a guide belt ring (8) and a hydraulic assembly, wherein two of the guide belt rings (8) form a group, and a group of the guide belt rings (8) is arranged in each of the vertical through holes; the two guide belt rings (8) are respectively arranged on the inner side of the Y-shaped sealing ring (7), and the guide belt ring (8) guides the smooth outer wall surface of the extended rotating rod (3); and the hydraulic assembly supplies lubricating oil to the sealing cavity between the two Y-shaped sealing rings (7).

8. The die head mechanism for producing negative pressure extruded board according to claim 7, characterized in that: There are multiple oil pressure components, and a group of the oil pressure components is arranged in a group of the vertical through holes that are close to each other; the oil pressure components include an oil channel group, a one-way valve (9) and a screw plug (10); the oil channel group is arranged on the sealing plate (4) and includes an oil guide ring groove (401), an oil channel (402) and an oil inlet pipe joint (403); the oil guide ring groove (401) is coaxially arranged in the middle of the vertical through hole; the inner end of the oil channel (402) is connected to all the oil guide ring grooves (401) in a group; the outer end of the oil channel (402) is connected to the oil inlet pipe joint (403) for introducing pressurized lubricating oil; the one-way valve (9) is arranged on the hole of the oil channel (402) close to the oil inlet pipe joint (403); the screw plug (10) blocks the exhaust passage of the oil channel (402).

9. The die head mechanism for producing negative pressure extruded board according to claim 8, characterized in that: The oil pressure assembly further comprises a pressure gauge (11), which is installed on the oil passage (402) and located behind the one-way valve (9).

10. A negative pressure extruded board production line, comprising an automatic feeder, an extruder (12), a leveling device (13), a traction device (14), a conveyor frame group (18) and a post-processing equipment group (15) connected in sequence from the front, characterized in that: It also includes a sealing cylinder (16), a water pool (17) and an exhaust device, and the die head mechanism for producing negative pressure extruded boards according to any one of claims 1 to 9 is installed between the extruder (12) and the leveling device (13); the leveling device (13) and the traction device (14) are both provided with a sealing cover shell connected to the die head shell (2), and the exhaust port of the exhaust device is connected to the pipe joint of the sealing cover shell; the front end of the sealing cylinder (16) is sealed and connected to the sealing cover shell interface at the rear end of the traction device (14), and the front end of the conveying frame group (18) is supported by the output end of the traction device (14) and is sealed in the sealing cylinder (16); the rear end of the sealing cylinder (16) is bent downward to enter the water pool (17) and immersed below the liquid surface; the rear end of the conveying frame group (18) is then output backward and upward to the post-processing equipment group (15).

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