A negative pressure cylinder joint mechanism and extruded board negative pressure foaming production line

Abstract

The present invention discloses a negative pressure cylinder channel joint mechanism and an extruded board negative pressure foaming production line, wherein the negative pressure cylinder channel joint mechanism comprises a telescopic cylinder, a ground guide rail, a linear drive unit, a movable conveying frame, a fixed cylinder and a fixed conveying frame, the middle and rear part of the telescopic cylinder is coaxially slidably inserted into the front end of the fixed cylinder, a sealing component is arranged between the outer wall of the rear end of the telescopic cylinder and the inner wall of the fixed cylinder, and a docking flange plate is arranged at the front end of the telescopic cylinder; the bottom of the front end of the telescopic cylinder is slidably connected to the ground guide rail through a bottom bracket guide and is driven by the linear drive unit; an inner slide rail frame is horizontally arranged in the telescopic cylinder, the movable conveying frame is detachably slidably connected to the front section of the inner slide rail frame, the rear end of the fixed conveying frame is fixedly connected in the fixed cylinder, the front end of the fixed conveying frame is slidably overlapped on the movable conveying frame, and a plurality of conveying rollers are arranged on the top of the fixed conveying frame and the movable conveying frame. The present invention arranges a movable conveying roller frame in the telescopic cylinder, reduces the conveying resistance of the extruded board, and ensures the conveying quality.

Description

Technical Field

[0001] The invention relates to the technical field of negative pressure foaming production of extruded boards, in particular to a negative pressure cylinder joint mechanism and a negative pressure foaming production line for 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 foaming of the extruded board under negative pressure or vacuum conditions can make it foam more fully, and increase the thickness of the extruded board under the same feeding amount. This foaming method has become a new research and development direction for those skilled in the art. For example, the invention patent with publication number CN114161743A discloses a vacuum foaming production line for XPS extruded boards, which relates to the field of vacuum foaming. The production line utilizes the principle of vacuum foaming and improves the foaming rate of XPS raw materials through the design of negative pressure production, while effectively reducing production costs. Since the foaming mold at the rear end of the extruder needs to be frequently replaced, maintained, and maintained, a sufficient operating space is required to facilitate the disassembly of the foaming mold. In order to obtain the operating space, the patent technical solution records that the discharge port of the closed multi-roller tractor is connected to the closed conveyor frame through a floating joint. The floating joint includes a first square tube, the right end of the first square tube is slidably inserted into the second square tube, and a soft cloth sealing sleeve is sleeved on the outside of the first square tube. The left end of the soft cloth sealing sleeve is fixedly connected to the outer surface of the first square tube through a throat clamp, and the right end of the soft cloth sealing sleeve is fixedly connected to the outer surface of the left port of the second square tube through a throat clamp. The closed shaping table and the closed multi-roller tractor behind the mold are designed to be movable structures. When working, the front end of the first square tube of the floating joint is connected to the closed multi-roller tractor, and the rear end is inserted into the second square tube, and then the rear end of the second square tube is connected to the closed conveyor frame behind. When overhauling, the first square tube moves backward with the closed multi-roller tractor, while the second square tube does not move, and the first square tube can slide in the second square tube. However, in the patented technical solution, no conveying rollers are provided in the first square tube and the second square tube, and the rolling conveying of the extruded board cannot be realized. The surface of the extruded board that has just been foamed is relatively soft. If it directly scrapes the inner wall of the square tube, it will cause irregular scratches on the surface.

[0004] Therefore, it is necessary to develop a negative pressure cylinder joint mechanism to address the above defects. Summary of the invention

[0005] The purpose of the present invention is to provide a negative pressure cylinder joint mechanism, in which a movable conveying roller frame is arranged in a telescopic cylinder, so as to reduce the conveying resistance of the extruded plate and ensure the conveying quality.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The invention discloses a negative pressure cylinder joint mechanism, comprising a telescopic cylinder, a ground guide rail, a linear drive unit, a movable conveying frame, a fixed cylinder and a fixed conveying frame, wherein the middle and rear part of the telescopic cylinder is coaxially slidably inserted into the front end of the fixed cylinder, a sealing assembly is arranged between the outer wall of the rear end of the telescopic cylinder and the inner wall of the fixed cylinder, and the front end of the telescopic cylinder is provided with a docking flange plate for sealingly connecting the front equipment; a bottom bracket is arranged at the bottom of the front end of the telescopic cylinder, and the bottom bracket is slidingly connected to the ground guide rail in a guiding direction, and the guiding direction of the ground guide rail is arranged parallel to the axis of the telescopic cylinder; the linear drive unit drives the telescopic cylinder to telescope in the fixed cylinder; an inner slide rail frame is horizontally arranged in the telescopic cylinder, the movable conveying frame is detachably slidably connected to the front section of the inner slide rail frame, the rear end of the fixed conveying frame is fixedly connected in the fixed cylinder, the front end of the fixed conveying frame is slidingly overlapped with the rear section of the movable conveying frame, the fixed conveying frame is supported at the rear of the movable conveying frame, and the tops of the fixed conveying frame and the movable conveying frame are both provided with a plurality of conveying rollers arranged in parallel and spaced apart.

[0008] Furthermore, the ground guide rail specifically adopts a linear guide rail, and two of the ground guide rails are arranged in parallel on both sides below the telescopic cylinder. Two sliding blocks cooperating with the linear guide rails are respectively arranged on both sides of the bottom bracket, and a connecting seat for connecting the linear drive unit is arranged in the middle position of the bottom of the bottom bracket.

[0009] Furthermore, the linear drive unit specifically adopts an acting cylinder 1, the middle part of which is installed on the ground below the telescopic cylinder using a pin shaft seat, the swing plate of the connecting seat is installed on the bottom of the bottom bracket through the shaft heads at both ends, and the end of the piston rod of the acting cylinder 1 is installed on the swing plate.

[0010] Furthermore, the movable conveyor frame is a frame structure welded from steel sections and is provided with two parallel guide rail surfaces on both sides of the top; bottom wheels rolling on the guide rail surfaces are provided on both sides of the bottom surface of the movable conveyor frame; the front end of the movable conveyor frame protrudes out of the docking flange plate and can be overlapped into the sealing cover of the front equipment; the front part of the fixed conveyor frame is also provided with bottom wheels capable of rolling on the guide rail surfaces.

[0011] Furthermore, the sealing assembly includes a plurality of O-rings arranged at equal intervals, and a plurality of sealing ring grooves are formed on the outer wall of the rear end of the telescopic cylinder, and the O-rings are installed in the sealing ring grooves.

[0012] Furthermore, it also includes a guide ring, a guide ring groove is provided between two adjacent sealing ring grooves, the guide ring is installed in the guide ring groove and serves as a centering spacer for the telescopic tube and the fixed tube.

[0013] Furthermore, it also includes a vacuum lock assembly, which is arranged on the outer wall of the front end of the fixed tube, and the telescopic tube is provided with a locking hole on the side wall behind the sealing assembly. The working end of the vacuum lock assembly can be inserted into the locking hole for locking under negative pressure in the cavity.

[0014] Furthermore, the vacuum lock assembly includes an outer sleeve, an inner guide cylinder, a support plate group, a locking pin, a compression spring, an elastic rubber plate and a pressure ring, the fixing cylinder is coaxially provided with a mounting hole at a position corresponding to the locking hole, the inner end of the outer sleeve is welded to the mounting hole, the inner guide cylinder is coaxially installed in the outer sleeve through the support plate group, and a vent hole is provided on the support plate group; the locking pin is slidably connected in the inner guide cylinder, and the inner end of the locking pin can be inserted inwardly into the locking hole; the compression spring is sleeved on the locking pin and both ends abut between the outer end head of the locking pin and the outer end face of the inner guide cylinder; the elastic rubber plate is sealed and crimped onto the folded edge of the outer end of the outer sleeve through the pressure ring, and the inner side wall of the elastic rubber plate elastically squeezes the outer end head of the locking pin.

[0015] Furthermore, the support plate group includes support plate one and support plate two, support plate one is a circular ring plate and is welded and supported between the inner wall of the outer sleeve and the outer wall of the inner end of the inner guide tube, support plate two is a conical ring plate and is welded between the inner wall of the outer sleeve and the outer wall of the outer end of the inner guide tube, and the wide opening of support plate two faces the elastic rubber plate.

[0016] The present invention discloses a negative pressure foaming production line for extruded boards, comprising an automatic feeder, an extruder, a mold, a leveling device, a traction machine, a negative pressure cylinder joint mechanism as described in any one of the above items, a water tank, a rear conveying frame and a post-processing equipment group, which are connected in sequence from the front, wherein the docking flange plate is detachably sealed and connected to a sealing cover shell of the traction machine; the rear end of the fixed cylinder is bent downward to enter the water tank and immersed below the liquid surface, the front end of the rear conveying frame is connected to the lower port of the fixed cylinder to convey the extruded board, and the rear section of the rear conveying frame outputs the foam upward and backward to the post-processing equipment group.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] The negative pressure cylinder joint mechanism of the present invention is provided with an inner slide rail frame in the telescopic cylinder, and the inner slide rail frame supports the movable conveying frame, so that when the telescopic cylinder is retracted into the fixed cylinder, the movable conveying frame can be lifted out, thereby realizing the movable working distance between the telescopic cylinder and the front equipment. The extruded plate is rolled and supported by the conveying rollers of the fixed conveying frame and the movable conveying frame, so that the surface of the extruded plate is protected and the conveying quality of the extruded plate is improved.

[0019] In addition, by providing the linear guide rail to guide the telescopic movement of the telescopic cylinder, the guiding accuracy is ensured; by providing the working cylinder 1 installed on the pin shaft seat and the swinging plate that can swing, it is ensured that the telescopic cylinder will not get stuck with the fixed cylinder during the telescopic movement of the working cylinder 1. By providing the guide surface and the bottom wheel, the resistance applied by the fixed conveyor frame and the movable conveyor frame to the telescopic cylinder can be reduced during the telescopic movement of the telescopic cylinder, ensuring smooth opening and closing. By providing multiple parallel and spaced O-rings for sealing, multiple seals are formed to reduce the occurrence of leakage; by adding the guide belt ring between the telescopic cylinder and the fixed cylinder to assist in supporting the rear end of the telescopic cylinder, the excessive extrusion of the O-ring under the dead weight of the telescopic cylinder is improved, and the wear of the O-ring is reduced.

[0020] Moreover, by adding a vacuum lock assembly to the outer wall of the front end of the fixed tube, the working end of the vacuum lock assembly can be inserted into the locking hole for locking, preventing the telescopic tube from being forcibly opened under the negative pressure state in the cavity, and avoiding the damage caused by the strong pulling airflow. By cleverly setting the elastic rubber plate as a negative pressure detection and action element at the same time, it is not only convenient for observation, but also ensures that the locking hole is always pinned under the negative pressure state. Compared with the electrical locking method using a sensor, it is more direct, stable and reliable. By adding a gasket made of plastic material, the elastic rubber plate is prevented from contacting the metal edge of the outer end of the lock pin for a long time, which reduces impact wear and increases the service life of the elastic rubber plate. By setting the conical support plate 2, under normal working conditions, the elastic rubber plate is compressed inward and attached to the outer conical surface of the support plate 2 to form an internal limit to prevent the elastic rubber plate from being damaged due to excessive deformation.

[0021] The negative pressure foaming production line for extruded boards of the present invention is provided with a second acting cylinder. When performing maintenance or replacing the mold, the push-up and leveling device and the traction machine move backward on the ground guide rail, thereby freeing up space behind the mold for operators to operate conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of the negative pressure foaming production line for extruded boards of the present invention;

[0024] Figure 2It is a schematic diagram of the main structure of the joint mechanism of the negative pressure cylinder of the present invention;

[0025] Figure 3 This is a schematic diagram of the main structure of the telescopic tube in the present invention;

[0026] Figure 4 It is a left-side structural schematic diagram of the telescopic cylinder in the present invention;

[0027] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure of the vacuum lock assembly.

[0028] Description of reference numerals: 1. telescopic cylinder; 101. bottom bracket; 102. slider; 103. connecting seat; 104. inner slide rail frame; 105. sealing ring groove; 106. inner support rib; 107. locking hole; 108. docking flange plate; 2. ground rail; 3. acting cylinder 1; 4. movable conveying roller frame; 401. conveying roller; 402. bottom wheel; 5. fixing cylinder; 501. end ring; 502. supporting leg; 6. fixing Conveying roller frame; 7. Adapter cover; 8. Traction machine; 9. Vacuum lock assembly; 901. Inner guide cylinder; 902. Support plate one; 903. Support plate two; 904. Lock pin; 905. Compression spring; 906. Folding edge; 907. Elastic rubber sheet; 908. Gasket; 909. Pressing ring; 10. Extruder; 11. Leveling device; 12. Action cylinder two; 13. Water tank; 14. Rear conveying frame; 15. Post-processing equipment assembly. DETAILED DESCRIPTION

[0029] The core of the present invention is to provide a negative pressure cylinder joint mechanism, in which a movable conveying roller frame is arranged in the telescopic cylinder, so as to reduce the conveying resistance of the extruded plate and ensure the conveying quality.

[0030] 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.

[0031] 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.

[0032] With reference to the accompanying drawings, Figure 1This is a schematic diagram of the structure of the negative pressure foaming production line for extruded boards of the present invention; Figure 2 It is a schematic diagram of the main structure of the joint mechanism of the negative pressure cylinder of the present invention; Figure 3 This is a schematic diagram of the main structure of the telescopic tube in the present invention; Figure 4 It is a left-side structural schematic diagram of the telescopic cylinder in the present invention; Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure of the vacuum lock assembly.

[0033] Example 1

[0034] In a specific embodiment, Figures 2 to 4 As shown, a negative pressure cylinder joint mechanism comprises a telescopic cylinder 1, a ground guide rail 2, a linear drive unit, a movable conveying frame 4, a fixed cylinder 5 and a fixed conveying frame 6. The middle and rear part of the telescopic cylinder 1 is coaxially slidably inserted into the front end of the fixed cylinder 5, and a sealing component is arranged between the outer wall of the rear end of the telescopic cylinder 1 and the inner wall of the fixed cylinder 5 to seal the gap between the two. The front end of the telescopic cylinder 1 is provided with a docking flange plate 108 for sealingly connecting the front equipment, and a full circle of sealing gaskets are arranged on the docking flange plate 108. A bottom bracket 101 is arranged at the bottom of the front end of the telescopic cylinder 1, and the bottom bracket 101 is guided and slidably connected to the ground guide rail 2, and the guiding direction of the ground guide rail 2 is arranged parallel to the axis of the telescopic cylinder 1. The linear drive unit drives the telescopic cylinder 1 to telescope in the fixed cylinder 5. An inner slide rail frame 104 is horizontally arranged in the telescopic cylinder 1, and the movable conveying frame 4 is detachably slidably connected to the front section of the inner slide rail frame 104, and the rear end of the fixed conveying frame 6 is fixedly connected in the fixed cylinder 5, and the front end of the fixed conveying frame 6 is slidably overlapped on the rear section of the movable conveying frame 4. The fixed conveyor frame 6 is supported at the rear of the movable conveyor frame 4 . The tops of the fixed conveyor frame 6 and the movable conveyor frame 4 are both provided with a plurality of conveyor rollers 401 arranged in parallel and at intervals. The extruded plates to be conveyed roll through the conveyor rollers 401 .

[0035] Specifically, if Figure 4 As shown, the cross-sectional shapes of the telescopic cylinder 1 and the fixed cylinder 5 can be circular cylinders, square cylinders, elliptical cylinders, etc., without limitation, and all fall within the protection scope of the present invention.

[0036] By arranging the inner slide rail frame 104 in the telescopic cylinder 1, the inner slide rail frame 104 supports the movable conveying frame 4, so that when the telescopic cylinder 1 is retracted into the fixed cylinder 5, the movable conveying frame 4 can be lifted out, thereby realizing the movable working distance between the telescopic cylinder 1 and the front equipment. The extruded board is rolled and supported by the conveying rollers 401 of the fixed conveying frame 6 and the movable conveying frame 4, thereby protecting the surface of the extruded board and improving the conveying quality of the extruded board.

[0037] In a specific implementation of this embodiment, Figure 2 and Figure 4As shown, the floor guide rail 2 is specifically a linear guide rail, which is laid on the floor of the workshop. Two floor guide rails 2 are arranged in parallel on both sides below the telescopic cylinder 1, and two sliders 102 cooperating with the linear guide rails are respectively arranged on both sides of the bottom bracket 101. A connecting seat 103 for connecting the linear drive unit is arranged in the middle of the bottom of the bottom bracket 101.

[0038] Specifically, if Figure 2 and Figure 4 As shown, the linear drive unit specifically adopts an acting cylinder 3, the middle part of which is installed on the ground below the telescopic cylinder 1 using a pin shaft seat, the swing plate of the connecting seat 103 is installed at the bottom of the bottom bracket 101 through the shaft heads at both ends, and the piston rod end of the acting cylinder 3 is installed on the swing plate.

[0039] The linear guide rail is provided to guide the telescopic movement of the telescopic cylinder 1, thereby ensuring the guiding accuracy; the action cylinder 3 installed on the pin shaft seat and the swinging plate are provided to ensure that the telescopic cylinder 1 will not get stuck with the fixed cylinder 5 during the telescopic process of the action cylinder 3.

[0040] In a specific implementation of this embodiment, Figure 3 and Figure 4 As shown, the movable conveyor frame 4 is a steel welded frame structure and two parallel guide surfaces are arranged on both sides of the top, and the outer sides of the guide surfaces are provided with retaining edges. Bottom wheels 402 rolling on the guide surfaces are arranged on both sides of the bottom surface of the movable conveyor frame 4, and the front end of the movable conveyor frame 4 protrudes out of the docking flange plate 108 and can be overlapped into the sealing cover of the front equipment. The front part of the fixed conveyor frame 6 is also provided with bottom wheels 402 that can roll on the guide surface.

[0041] By providing the guide rail surface and the bottom wheel 402 , the resistance exerted by the fixed conveying frame 6 and the movable conveying frame 4 on the telescopic cylinder 1 can be reduced during the telescopic movement of the telescopic cylinder 1 , thereby ensuring smooth opening and closing.

[0042] In a specific implementation of this embodiment, Figure 2 and Figure 3 As shown, the sealing assembly includes a plurality of O-rings arranged at equal intervals, and a plurality of sealing ring grooves 105 are formed on the outer wall of the rear end of the telescopic cylinder 1 , and the O-rings are installed in the sealing ring grooves 105 .

[0043] Specifically, since the diameter of the sealing part is too large, the corresponding large-sized O-ring cannot be purchased, and a round rubber strip is used to fill the sealing ring groove 105 as a substitute. The interfaces in two adjacent sealing ring grooves 105 are bonded with elastic glue, and the interfaces are staggered to avoid being at the same angle.

[0044] Specifically, if Figure 2 and Figure 3 As shown, the negative pressure cylinder joint mechanism of the present invention also includes a guide ring. A guide ring groove is provided between two adjacent sealing ring grooves 105. The guide ring is installed in the guide ring groove and serves as a centering spacer for the telescopic cylinder 1 and the fixed cylinder 5.

[0045] Specifically, the guide belt ring is made of polytetrafluoroethylene material with good wear resistance and good self-lubricating performance.

[0046] By providing multiple parallel and spaced O-rings for sealing, multiple seals are formed to reduce the occurrence of leakage; by adding the guide belt ring between the telescopic cylinder 1 and the fixed cylinder 5 to assist in supporting the rear end of the telescopic cylinder 1, the excessive extrusion of the O-ring under the deadweight of the telescopic cylinder 1 is improved, and the wear of the O-ring is reduced.

[0047] In summary, the negative pressure cylinder joint mechanism of the present invention, by arranging an inner slide rail frame 104 in the telescopic cylinder 1, the inner slide rail frame 104 supports the movable conveying frame 4, and can lift out the movable conveying frame 4 when the telescopic cylinder 1 is retracted into the fixed cylinder 5, thereby realizing the movable operation distance between the telescopic cylinder 1 and the front equipment. The extruded board is rolled and supported by the conveying rollers 401 of the fixed conveying frame 6 and the movable conveying frame 4, so that the surface of the extruded board is protected and the conveying quality of the extruded board is improved. In addition, by arranging the linear guide rail to guide the telescopic action of the telescopic cylinder 1, the guiding accuracy is guaranteed; by arranging the action cylinder 1 3 installed by the pin shaft seat and the swinging plate that can swing, it is guaranteed that the telescopic cylinder 1 will not get stuck with the fixed cylinder 5 during the telescopic process of the action cylinder 1. By arranging the guide surface and the bottom wheel 402, the resistance applied by the fixed conveying frame 6 and the movable conveying frame 4 to the telescopic cylinder 1 can be reduced during the telescopic action of the telescopic cylinder 1, ensuring smooth opening and closing. By providing multiple parallel and spaced O-rings for sealing, multiple seals are formed to reduce the occurrence of leakage; by adding the guide belt ring between the telescopic cylinder 1 and the fixed cylinder 5 to assist in supporting the rear end of the telescopic cylinder 1, the excessive extrusion of the O-ring under the deadweight of the telescopic cylinder 1 is improved, and the wear of the O-ring is reduced.

[0048] Example 2

[0049] Maintenance and repair needs require that when the telescopic cylinder 1 is opened, the negative pressure in the inner cavity often needs to be emptied and eliminated before it can be opened. In the actual operation process, due to negligence, sometimes the negative pressure in the conveying pipeline is forgotten to be emptied and the working cylinder 3 is directly started to open the telescopic cylinder 1. The negative pressure is suddenly released from the port of the telescopic cylinder 1, which will cause a strong airflow and produce a roaring noise, which will not only cause airflow impact damage to the extruded board and equipment in the inner cavity, but also may be pulled down by people around, causing safety accidents. At the same time, the water column drawn by the fixed cylinder 5 is rapidly discharged into the pool 13, forming a water hammer effect, which will impact and damage the extruded board transported by the pool 13 on the one hand, and will also aggravate the airflow at the port of the telescopic cylinder 1 on the other hand.

[0050] In order to avoid the above situation, the present invention is improved on the basis of the above embodiment 1 to form this embodiment. In this embodiment 2, if Figure 2 , Figure 3 and Figure 5 As shown, the negative pressure cylinder joint mechanism of the present invention further includes a vacuum lock assembly 9, which is arranged on the outer wall of the front end of the fixed cylinder 5, and the axis of the vacuum lock assembly 9 is in a horizontal position and perpendicular to the outer wall of the fixed cylinder 5. The telescopic cylinder 1 is provided with a locking hole 107 on the side wall behind the sealing assembly, and the working end of the vacuum lock assembly 9 can be inserted into the locking hole 107 for locking under the negative pressure state in the cavity.

[0051] By adding a vacuum lock assembly 9 to the outer wall of the front end of the fixed tube 5, the working end of the vacuum lock assembly 9 can be inserted into the locking hole 107 for locking, preventing the telescopic tube 1 from being forcibly opened under the negative pressure state in the cavity, thereby avoiding damage caused by the generation of strong pulling airflow.

[0052] Specifically, if Figure 2 , Figure 3 and Figure 5As shown, the vacuum lock assembly 9 includes an outer sleeve, an inner guide cylinder 901, a support plate group, a lock pin 904, a compression spring 905, an elastic rubber plate 907 and a pressure ring 909. The fixed cylinder 5 is coaxially provided with a mounting hole at a position corresponding to the locking hole 107, and the diameter of the mounting hole is much larger. The inner end of the outer sleeve is welded on the mounting hole, and the sealing welding prevents air leakage. The inner guide cylinder 901 is coaxially installed in the outer sleeve through the support plate group, and a vent hole is provided on the support plate group. The lock pin 904 is slidably connected in the inner guide cylinder 901, and the inner end of the lock pin 904 can be inserted into the locking hole 107 inwardly, and the inner end of the lock pin 904 is set as a round head. The compression spring 905 is sleeved on the lock pin 904 and the two ends are abutted between the outer end of the lock pin 904 and the outer end surface of the inner guide cylinder 901. The elastic rubber plate 907 is sealed and crimped onto the folded edge 906 at the outer end of the outer sleeve through the pressure ring 909, and the inner side wall of the elastic rubber plate 907 elastically squeezes the outer end of the locking pin 904. When both the inner and outer sides of the elastic rubber plate 907 are in a normal pressure state, Figure 5 As shown, the compression spring 905 is reset, pushing the lock pin 904 outward, the outer end of the lock pin 904 protrudes outward to push the center of the elastic rubber plate 907, and the inner end of the lock pin 904 exits the locking hole 107. When the negative pressure chamber connected to the inner side of the elastic rubber plate 907 is in a negative pressure state, that is, a normal working state, the elastic rubber plate 907 is compressed inward, pushing the outer end of the lock pin 904, the compression spring 905 is compressed, and the inner end of the lock pin 904 is inserted into the locking hole 107 to form a lock.

[0053] By cleverly setting the elastic rubber plate 907 as both a negative pressure detection and actuating element, it is not only easy to observe, but also ensures that the locking hole 107 is always pinned under negative pressure. Compared with the electrical locking method using a sensor, it is more direct, stable and reliable.

[0054] Specifically, if Figure 5 As shown, a gasket 908 is bonded to the middle position of the inner wall of the elastic rubber plate 907 . The gasket 908 is a polytetrafluoroethylene round gasket and has a diameter slightly larger than the outer end of the locking pin 904 .

[0055] By adding the gasket 908 made of plastic material, the elastic rubber plate 907 is prevented from contacting the metal edge of the outer end of the locking pin 904 for a long time, thereby reducing impact wear and improving the service life of the elastic rubber plate 907.

[0056] Specifically, if Figure 5As shown, the support plate group includes support plate 1 902 and support plate 2 903. A plurality of ventilation holes are evenly distributed on the circumference of support plate 1 902 and support plate 2 903, and the diameter of the ventilation holes is not greater than 2 mm. Support plate 1 902 is a circular ring plate and is welded and supported between the inner wall of the outer sleeve and the inner end outer wall of the inner guide cylinder 901. Support plate 2 903 is a conical ring plate and is welded between the inner wall of the outer sleeve and the outer end outer wall of the inner guide cylinder 901. The large opening of support plate 2 903 faces the elastic rubber plate 907.

[0057] By setting the conical support plate 903, under normal working conditions, the elastic rubber plate 907 is compressed inwardly and attached to the outer conical surface of the support plate 903 to form an inner limit to prevent the elastic rubber plate 907 from being damaged due to excessive deformation.

[0058] The working principle of the negative pressure cylinder joint mechanism in this embodiment is as follows: when the production line is operating normally, the telescopic cylinder 1 is in a closed state, and the working end of the vacuum lock assembly 9 is aligned with the locking hole 107. It should be emphasized that the locking hole 107 is located on the inner side of the sealing assembly, i.e., the negative pressure side. Under the normal working state of the negative pressure foaming, due to the connection of the vent hole, the air pressure in the chamber between the support plate 2 903 and the elastic rubber plate 907 is consistent with that in the conveying pipeline. Under the action of the outer atmospheric pressure, the elastic rubber plate 907 is compressed inward, the gasket 908 pushes the outer end of the locking pin 904, the compression spring 905 is compressed, and the inner end of the locking pin 904 is inserted into the locking hole 107 to form a lock. If the negative pressure locking pin 904 in the conveying pipeline is not emptied, it will always be in a state of pinning the locking hole 107, thereby preventing misoperation. When the mold needs to be replaced or repaired, the operator first needs to operate the drain valve to slowly release the negative pressure. When both the inner and outer sides of the elastic rubber plate 907 are at normal pressure, the compression spring 905 is reset, pushing the lock pin 904 outward, and the outer end of the lock pin 904 protrudes outward to push the center of the elastic rubber plate 907. The inner end of the lock pin 904 exits the locking hole 107 and releases the lock. At this time, the action cylinder 1 3 can be operated to open the telescopic cylinder 1.

[0059] In summary, the negative pressure cylinder joint mechanism of the present invention, by adding a vacuum lock assembly 9 on the outer wall of the front end of the fixed cylinder 5, the working end of the vacuum lock assembly 9 can be inserted into the locking hole 107 for locking, so as to prevent the telescopic cylinder 1 from being forcibly opened under the negative pressure state in the cavity, and avoid the damage caused by the strong pulling airflow. By cleverly setting the elastic rubber plate 907 as a negative pressure detection and action element at the same time, it is not only convenient for observation, but also ensures that the locking hole 107 is always pinned under the negative pressure state. Compared with the electrical locking method using a sensor, it is more direct, stable and reliable. By adding a gasket 908 made of plastic material, the elastic rubber plate 907 is prevented from contacting the metal edge of the outer end of the lock pin 904 for a long time, the impact wear is reduced, and the service life of the elastic rubber plate 907 is increased. By setting the conical support plate 903, under normal working conditions, the elastic rubber plate 907 is compressed inward and attached to the outer cone surface of the support plate 903 to form an inner limit, so as to avoid the elastic rubber plate 907 from being damaged due to excessive deformation.

[0060] Example 3

[0061] like Figure 1 As shown, the present invention also discloses an extruded board negative pressure foaming production line, comprising an automatic feeder, an extruder 10, a mold, a leveling device 11, a tractor 8, a negative pressure cylinder joint mechanism as described in the above embodiment, a water tank 13, a rear conveying frame 14 and a post-processing equipment group 15, which are connected in sequence from the front. The mold, the leveling device 11 and the tractor 8 are all provided with a sealed cover.

[0062] Specifically, if Figure 1 As shown, the butt flange plate 108 is detachably sealed and connected to the sealing housing of the tractor 8. When the telescopic cylinder 1 is a cylindrical structure, a transfer housing with a round mouth to a square mouth is arranged between the butt flange plate 108 and the housing of the tractor 8. The transfer housing and the butt flange plate 108 are connected by flange bolts. The air extraction device for extracting air to form negative pressure is connected to the sealing housing of the tractor 8 through a pipe joint, and the sealing housing of the tractor 8 is also connected to an exhaust valve.

[0063] The rear end of the fixed cylinder 5 is bent downward into the pool 13 and immersed below the liquid level. When the negative pressure is working, part of the water in the pool 13 climbs up a distance along the inclined section of the sealing cylinder 16. The front end of the rear conveying frame 14 is connected to the lower port of the fixed cylinder 5 to convey the extruded board, and the rear section of the rear conveying frame 14 outputs the extruded board upward and backward to the post-processing equipment group 15. The rear conveying frame 14 adopts the method of pressing the conveyor belt up and down, and the two parallel conveyor belts clamp and convey the extruded board to avoid automatic floating under the action of water buoyancy and unable to continue to convey backward. An air-drying device is also provided at a high place obliquely upwardly from the rear end of the rear conveying frame 14, and the air-drying device blows the water stains on the upper and lower sides of the extruded board dry.

[0064] 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.

[0065] In a specific implementation of this embodiment, Figure 1 As shown, it also includes a second cylinder 12, and the leveling device 11 and the tractor 8 are arranged side by side and the frames are connected together by bolts. The bottom of the frames of the leveling device 11 and the tractor 8 are both slidably connected to the guide rail 2 through the slider guide, and the second cylinder 12 is installed on the ground below the leveling device 11 through the end plate support, and the piston rod end of the second cylinder 12 is connected to the connecting plate at the bottom of the frame of the tractor 8.

[0066] By adding the second action cylinder 12, when the mold is maintained or replaced, the push-up and leveling device 11 and the traction machine 8 move backward on the ground guide rail 2, which can make room behind the mold for operators to operate.

[0067] When the negative pressure foaming production line of the extruded board of the present invention is working: the production process of the foaming molding of the polystyrene insulation board is carried out under a negative pressure state, and the negative pressure is controlled at 0.02-0.04MPa. In this way, the polystyrene insulation board can be foamed very fully when discharged from the extrusion port of the mold, so that the specific gravity of the insulation board is reduced, which can reduce the consumption of raw materials and correspondingly reduce the production cost. Since the foaming is particularly sufficient, the quality of the insulation board is also significantly improved. Under the pulling of the traction roller of the traction machine 8, the extruded board is transported backward. When passing through the negative pressure cylinder joint mechanism of the present invention, the extruded board passes on the movable conveying frame 4 and the fixed conveying frame 6 and is supported by the conveying roller 401. When the mold needs to be replaced or maintenance and overhaul is required, the production line is first shut down, and the emptying valve is operated to discharge the negative pressure of the entire sealed pipeline cavity. At the end of the emptying, it is observed that the elastic rubber plate 907 of the vacuum lock assembly 9 is ejected and the lock pin 904 is unlocked. The operator removes the bolts on the docking flange plate 108, and then operates the cylinder 1 3 to open the telescopic cylinder 1, and the telescopic cylinder 1 is inserted into the fixed cylinder 5. The movable conveyor frame 4 is lifted out from the opening by the overhead crane, so that an operating space for maintenance and repair is formed between the traction machine 8 and the docking flange plate 108. When the mold needs to be replaced, the bolts between the leveling device 11 and the mold cover are removed, and the operating cylinder 2 12 is operated to start, and the operating cylinder 2 12 is ejected, so that the leveling device 11 and the traction machine 8 move backward along the ground guide rail 2 as a whole, and a new operating space is formed behind the mold to facilitate mold replacement.

[0068] 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.

[0069] 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 negative pressure cylinder joint mechanism, characterized in that: The invention comprises a telescopic cylinder (1), a ground guide rail (2), a linear drive unit, a movable conveying frame (4), a fixed cylinder (5) and a fixed conveying frame (6); the rear portion of the telescopic cylinder (1) is coaxially slidably inserted into the front end of the fixed cylinder (5); a sealing component is arranged between the outer wall of the rear end of the telescopic cylinder (1) and the inner wall of the fixed cylinder (5); the front end of the telescopic cylinder (1) is provided with a docking flange plate (108) for sealingly connecting to the front equipment; a bottom bracket (101) is arranged at the bottom of the front end of the telescopic cylinder (1); the bottom bracket (101) is slidably connected to the ground guide rail (2); the guiding direction of the ground guide rail (2) is aligned with the axis of the telescopic cylinder (1). The telescopic cylinder (1) and the fixed cylinder (5) are arranged in parallel; the linear drive unit drives the telescopic cylinder (1) to telescope in the fixed cylinder (5); an inner slide rail frame (104) is horizontally arranged in the telescopic cylinder (1); the movable conveying frame (4) is detachably slidably connected to the front section of the inner slide rail frame (104); the rear end of the fixed conveying frame (6) is fixedly connected in the fixed cylinder (5); the front end of the fixed conveying frame (6) is slidably overlapped on the rear section of the movable conveying frame (4); the fixed conveying frame (6) is supported at the rear of the movable conveying frame (4); and the tops of the fixed conveying frame (6) and the movable conveying frame (4) are both provided with a plurality of conveying rollers (401) arranged in parallel and at intervals.

2. The negative pressure cylinder joint mechanism according to claim 1, characterized in that: The ground guide rail (2) is specifically a linear guide rail, and two ground guide rails (2) are arranged in parallel on both sides below the telescopic cylinder (1), two sliding blocks (102) cooperating with the linear guide rails are respectively arranged on both sides of the bottom bracket (101), and a connecting seat (103) for connecting the linear drive unit is arranged at the middle position of the bottom of the bottom bracket (101).

3. The negative pressure cylinder joint mechanism according to claim 2, characterized in that: The linear drive unit specifically adopts an acting cylinder (3), the middle part of which is mounted on the ground below the telescopic cylinder (1) by a pin shaft seat, the swing plate of the connecting seat (103) is mounted on the bottom of the bottom bracket (101) through the shaft heads at both ends, and the piston rod end of the acting cylinder (3) is mounted on the swing plate.

4. The negative pressure cylinder joint mechanism according to claim 1, characterized in that: The movable conveyor frame (4) is a frame structure welded from steel sections and is provided with two parallel guide rail surfaces on both sides of the top; bottom wheels (402) that roll on the guide rail surfaces are provided on both sides of the bottom surface of the movable conveyor frame (4); the front end of the movable conveyor frame (4) protrudes out of the docking flange plate (108) and can be overlapped into the sealing cover of the front equipment; the front part of the fixed conveyor frame (6) is also provided with bottom wheels (402) that can roll on the guide rail surfaces.

5. The negative pressure cylinder joint mechanism according to claim 1, characterized in that: The sealing assembly comprises a plurality of O-rings arranged at equal intervals, a plurality of sealing ring grooves (105) are provided on the outer wall of the rear end of the telescopic cylinder (1), and the O-rings are installed in the sealing ring grooves (105).

6. The negative pressure cylinder joint mechanism according to claim 5, characterized in that: It also comprises a guide ring. A guide ring groove is provided between two adjacent sealing ring grooves (105). The guide ring is installed in the guide ring groove and serves as a centering spacer for the telescopic cylinder (1) and the fixed cylinder (5).

7. The negative pressure cylinder joint mechanism according to claim 1, characterized in that: The invention also comprises a vacuum lock assembly (9), wherein the vacuum lock assembly (9) is arranged on the outer wall of the front end of the fixed cylinder (5), and the telescopic cylinder (1) is provided with a locking hole (107) on the side wall behind the sealing assembly, and the working end of the vacuum lock assembly (9) can be inserted into the locking hole (107) for locking under negative pressure in the cavity.

8. The negative pressure cylinder joint mechanism according to claim 7, characterized in that: The vacuum lock assembly (9) comprises an outer sleeve, an inner guide cylinder (901), a support plate group, a lock pin (904), a compression spring (905), an elastic rubber plate (907) and a compression ring (909); the fixing cylinder (5) is coaxially provided with a mounting hole at a position corresponding to the locking hole (107); the inner end of the outer sleeve is welded to the mounting hole; the inner guide cylinder (901) is coaxially installed in the outer sleeve through the support plate group; the support plate group is provided with a vent hole; the lock pin (904) is slidably connected to the inner guide cylinder (901) and the locking pin (904) is slidably connected to the inner guide cylinder (901). Inside the guide cylinder (901), the inner end of the locking pin (904) can be inserted inwardly into the locking hole (107); the compression spring (905) is sleeved on the locking pin (904) and its two ends abut between the outer end of the locking pin (904) and the outer end surface of the inner guide cylinder (901); the elastic rubber plate (907) is sealed and crimped onto the folded edge (906) at the outer end of the outer sleeve through the compression ring (909), and the inner side wall of the elastic rubber plate (907) elastically squeezes the outer end of the locking pin (904).

9. The negative pressure cylinder joint mechanism according to claim 8, characterized in that: The support plate group includes support plate one (902) and support plate two (903), wherein support plate one (902) is a circular ring plate and is welded and supported between the inner wall of the outer sleeve and the inner end outer wall of the inner guide tube (901), and support plate two (903) is a conical ring plate and is welded between the inner wall of the outer sleeve and the outer end outer wall of the inner guide tube (901), and the wide opening of support plate two (903) faces the elastic rubber plate (907).

10. An extruded board negative pressure foaming production line, characterized in that: The invention comprises an automatic feeder, an extruder (10), a mold, a leveling device (11), a traction machine (8), a negative pressure cylinder joint mechanism as described in any one of claims 1 to 9, a water pool (13), a rear conveying frame (14) and a post-processing equipment group (15) which are connected in sequence from the front, wherein the docking flange plate (108) is detachably sealed and connected to the sealing cover shell of the traction machine (8); the rear end of the fixed cylinder (5) is bent downward to enter the water pool (13) and immersed below the liquid surface, the front end of the rear conveying frame (14) is connected to the lower port of the fixed cylinder (5) to convey the extruded plate, and the rear section of the rear conveying frame (14) outputs the plate upward and backward to the post-processing equipment group (15).

Images