CN111361128B

CN111361128B - Pipeline damping vibration attenuation device and method for extrusion and blow molding linkage system

Info

Publication number: CN111361128B
Application number: CN201811604473.7A
Authority: CN
Inventors: 高德祥; 刘会举; 顾方明; 修国华
Original assignee: Shaoxing Fumo New Material Co ltd
Current assignee: Shaoxing Fumo New Material Co ltd
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2021-12-17
Anticipated expiration: 2038-12-26
Also published as: CN111361128A

Abstract

The invention discloses a pipeline damping vibration attenuation device and a method for an extrusion and blow molding linkage system, wherein the device is integrally in a connecting sleeve body structure, two ends of the device are connected with fluid input and output pipelines, two ends of the sleeve body are respectively provided with a first end cover and a second end cover, a section of fluid channel for fluid conveying is arranged in the sleeve body, the fluid channel comprises an input end and an output end, the input end is connected with a fluid input pipeline leading from a vibration source, and the output end is connected with a fluid output pipeline; the fluid channel is of a layered structure, the inner wall of the fluid channel is a high-temperature creep resistant material layer, and the outer side of the fluid channel is sequentially coated with a heat-conducting pressure-bearing shell and a heating layer from inside to outside; the outer edge of the fluid input pipeline is sleeved with a first pressure-bearing spring, one end of the first pressure-bearing spring is abutted against a bulge on the outer wall of the fluid input pipeline, and the other end of the first pressure-bearing spring is abutted against the inner side end of the first end cover; and a second pressure-bearing spring is sleeved at the outer edge of the fluid output pipeline, one end of the second pressure-bearing spring is abutted against the bulge on the outer wall of the fluid output pipeline, and the other end of the second pressure-bearing spring is abutted against the inner side end of the second end cover.

Description

Pipeline damping vibration attenuation device and method for extrusion and blow molding linkage system

Technical Field

The invention relates to a novel composite material pipeline damping vibration attenuation method and a vibration attenuation device, in particular to a pipeline damping vibration attenuation device and a vibration attenuation method for an extrusion and blow molding linkage system.

Background

A damper or shock absorber is a device that uses damping characteristics to damp mechanical vibrations, or to damp the effects of mechanical vibrations, or to dissipate kinetic energy.

Machines and equipment used in industry, such as fans, air compressors, freezers, water pumps, vibrating screens, machine tools, internal combustion engines, vacuum pumps, metal forging presses, injection molding machines, and other electrically driven and reciprocating mechanical equipment, often require vibration damping systems to effectively isolate the vibration source and dampen mechanical vibrations, especially when precision instrumentation is associated with the drive shaft joints and pipe joints, often provided with vibration damping elements or systems. In general, the temperature, pressure or corrosiveness of the transmitted fluid is in a certain range or one of the parameters is high, such as high-temperature low-pressure fluid, normal-temperature high-pressure fluid or high-temperature corrosive fluid, but in some special industries, such as plastic processing industry, the fluid involved is high-temperature (up to 350 ℃) and high-pressure (more than 90MPa), and under the condition, the provision of a vibration damping system is a challenge.

The plastic film is a product of polymer materials with wide application. Plastic films can be produced by extrusion blow molding, calendering, casting, extrusion tentering, direct extrusion using a slit head, and the like, and the characteristics of various methods are different and the adaptability is also different. The blow molding method is economical and simple, and is suitable for both crystalline and amorphous plastics, and can be used for molding not only thin packaging films of several micrometers, but also packaging films with the thickness of 0.3mm, and can be used for producing narrow films and films with the width of nearly 20m, which is incomparable with other molding methods. In the blow molding process, the plastic is subjected to stretching orientation in the longitudinal and transverse directions, and the quality of the product is high, so that the blow molding is widely applied to film production.

Blow molding is a method of forming thermoplastics that has been developed based on extrusion processes. The essence of blow molding is that it is formed by blowing compressed air into an extruded parison, which includes blown film and hollow blow molding. In the blow molding process, plastics are extruded from a head die of an extruder to be blown into a film and undergo a series of changes such as viscosity, phase change and the like, and the close relationship among the changes is that the temperature of materials in each section of the extrusion process, whether the rotating speed of a screw is stable, the pressure of a head, the structure of the die, air ring cooling, indoor air cooling, air pressure blowing and the like. These interactions and coordination directly affect the quality of the film and the production efficiency.

In addition, blow molding is a complex multi-body coupling system and bears variable loads, so that vibration is commonly existed in blow molding, and the product quality is influenced. For example, vibration noise of a motor and a transmission in a screw extruder is transmitted to a film head through a pipe, and irregular vibration of a film tube, which makes it difficult to stabilize the diameter of the film tube, forms unstable film bubbles, causes unevenness in the diameter and wall thickness of the film tube, wrinkles, blooms, and the like, has a large influence on the product quality.

To ensure that such coupled systems operate smoothly under various vibration loads, reducing vibration is one of the key issues that must be addressed. One of the feasible methods is to realize damping vibration attenuation by utilizing the high damping characteristic of the high polymer material to inhibit the vibration peak value in a wide frequency range. However, since the molten plastic fluid fed from the screw extruder to the blow molding machine is in a high-temperature and high-pressure state and is corrosive in many cases, no polymer material having high damping characteristics has been reported which satisfies these conditions.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a pipeline damping vibration attenuation device for an extrusion and blow molding linkage system, which can realize efficient damping vibration attenuation and ensure that a required vibration attenuation system operates in a vibration allowable range.

The technical problem to be solved can be implemented by the following technical scheme.

A damping vibration damper for the pipeline of extruding and blow-moulding linkage system features that a connecting sleeve body is used as its whole, one end of said connecting sleeve body is connected to a fluid input pipeline leading from vibration source, another end is connected to a fluid output pipeline, and the first and second end covers are respectively arranged at both ends of said connecting sleeve body along the flowing direction of fluid,

the connecting sleeve body at least comprises a section of fluid channel used for fluid conveying, the fluid channel comprises an input end and an output end, the input end is connected with the fluid input pipeline led from the vibration source, and the output end is connected with the fluid output pipeline; the fluid channel is of a layered structure, the inner wall of the fluid channel is a high-temperature creep resistant material layer, and the outer side of the fluid channel is sequentially coated with a heat-conducting pressure-bearing shell or a heat-conducting pressure-bearing layer and a heating layer from inside to outside; a first pressure-bearing spring is sleeved at the outer edge of the fluid input pipeline, one end of the first pressure-bearing spring is abutted against a bulge on the outer wall of the fluid input pipeline, and the other end of the first pressure-bearing spring is abutted against the inner side end of the first end cover; and a second pressure-bearing spring is sleeved at the outer edge of the fluid output pipeline, one end of the second pressure-bearing spring is abutted against the bulge on the outer wall of the fluid output pipeline, and the other end of the second pressure-bearing spring is abutted against the inner side end of the second end cover.

As a further improvement of the technical scheme, the outer diameter of the high-temperature creep resistant material layer is not less than that of the fluid input pipeline and the outer wall bulge thereof.

As a further improvement of the technical scheme, the adjacent fluid input pipelines are not in complete contact with the high-temperature creep resistant material layer of the fluid channel, and a buffer space used for the high-temperature creep resistant material layer after deformation is arranged at the adjacent position of the two pipelines.

As a further improvement of the present technical solution, the adjacent fluid output pipelines are not in complete contact with the high temperature creep resistant material layer of the fluid channel, and a buffer space for the high temperature creep resistant material layer after deformation is arranged at the adjacent position.

As a further improvement of the technical scheme, an elastic isolation member is arranged between the heat-conducting pressure-bearing shell or the heat-conducting pressure-bearing layer and the fluid input pipeline; an elastic isolation piece is arranged between the heat-conducting pressure-bearing shell or the heat-conducting pressure-bearing layer and the fluid output pipeline.

As one of the preferred embodiments of the invention, the heating layer is further coated with an insulating layer.

As another preferred embodiment of the invention, the adjacent fluid input pipeline is in contact with at least one side, close to the fluid, of the high-temperature creep resistant material layer of the fluid channel.

As a further preferred embodiment of the invention, the adjacent fluid output pipeline is in contact with at least one side, close to the fluid, of the high-temperature creep-resistant material layer of the fluid channel.

As a further improvement of the technical scheme, the high-temperature creep resistant material layer is one or a mixture of more of silicon rubber, fluorine-containing rubber and rubber containing benzene rings.

Wherein, the high temperature creep resistant material layer is preferably FFMK rubber.

Also, the elastic spacers are preferably FFMK rubber O-rings.

Also as a further improvement of this solution, the thermally conductive pressure-bearing housing is a metal housing.

In addition, the pressure-bearing range of the heat-conducting pressure-bearing shell or the heat-conducting pressure-bearing layer is 5-90 MPa; preferably 10-30 MPa.

In addition, the temperature resistance range of the high-temperature creep resistant material layer is 0-350 ℃; preferably 20-250 deg.C.

The invention aims to solve another technical problem of providing a pipeline damping vibration attenuation method for an extrusion and blow molding linkage system.

The method comprises the following steps:

(1) adopting a layered composite fluid channel as a connecting channel of a fluid input pipeline and a fluid output pipeline; the innermost layer of the connecting channel is provided with a high-temperature-resistant material layer with creep property for absorbing vibration waves, and the outer layer is sequentially coated with a pressure-bearing shell and a heating functional layer;

(2) and pressure-bearing springs for absorbing and adjusting the energy generated by deformation of the high-temperature-resistant material layer with the creep property are arranged on two sides of the connecting channel along the fluid conveying direction.

As a further improvement of the method, the method also comprises the step of adopting an elastic body to counteract the collision vibration waves between the fluid input pipeline and the pressure-bearing shell and the fluid output pipeline.

The novel composite pipeline damping vibration attenuation method and the system device adopting the technical scheme have good heat resistance and pressure resistance, have the performance of vibration attenuation and noise reduction on equipment systems needing vibration attenuation, and have the excellent performance of balancing and slowing down mechanical vibration or slowing down the influence of mechanical vibration or consuming kinetic energy.

Drawings

FIG. 1 is a schematic diagram of a processing system provided by the present invention;

FIG. 2 is a schematic structural diagram of the pipe damping vibration attenuation device of the present invention;

in the figure: 100-vibration source 101-fluid and pipeline 200 transmitted by vibration source-vibration damping system 201-fluid and pipeline 300 after vibration damping-system to be operated by vibration damping

1-metal pressure-bearing shell 11, 12-connecting hole 2-damping component 21, 22-buffer cavity 31-fluid input pipeline 32-fluid output pipeline 33, 34-boss 41, 42-end gland 43, 44-inner side surface 45, 46-connecting hole 51, 52-pressure-bearing spring 6-

heater

71, 72, 73, 74-O-type elastic body 8-fluid

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1, the system of the present application includes three parts, a first part is a vibration source 100, a second part is a damping system 200, a third part is a system 300 to be damped (environmentally) to operate, and the three systems transmit high temperature and high pressure fluid. The vibration source 100 is connected to the damping system 200 via a fluid transmitted by the vibration source and a conduit 101, and the damping system 200 is connected to a system 300 to be damped via a damped fluid and a conduit 201.

Fig. 2 is a schematic structural diagram of a pipe damping vibration device for an extrusion and blow molding linkage system according to a vibration damping system 200. It is essentially a composite pipe damping system.

The high-temperature and high-pressure fluid 8 flows from the end A to the end B, the end A is connected with a vibration source (such as an extruder or power output equipment), vibration waves are transmitted to the flexible body (namely the damping part 2) along the end A of the connecting pipeline, the damping part of the flexible body has the capability of absorbing the vibration waves, namely the damping part of the flexible body has the function of reducing the vibration, the vibration waves received by the end B of the connecting pipeline are greatly reduced compared with the vibration waves received by the end A, and therefore the stable operation of the connecting equipment of the end B is guaranteed. The vibration damping device aims to solve the problem that a corrosive-resistant fluid system possibly exists at high temperature and high pressure.

In a specific structure, the whole device has the structural characteristic of a connecting sleeve body/sleeve. The high-temperature and high-pressure fluid 8 enters the system along the fluid input pipeline 31, flows through a fluid channel formed by the inner cavity of the middle damping part 2, and finally reaches a corresponding system needing vibration reduction through the fluid output pipeline 32.

The middle flexible damping part 2 is made of high-temperature-resistant and corrosion-resistant materials, and the metal pressure-bearing shell 1 covers the flexible damping part 2 so as to bear the pressure transmitted by high-temperature fluid; the energy generated by the deformation of the damping member 2 (damping main member, mainly radial direction) is absorbed and adjusted by the pressure-bearing springs 51 and 52 (for adjusting the axial and radial pressures) and the end pressure covers 41 and 42 (also may be flanges) provided around the outer edges of the fluid input pipe 31 and the fluid output pipe 32 on both sides. The anti-collision vibration waves of the metal pressure-bearing shell 1 and the AB end of the connecting pipeline are offset by the O-shaped

elastic bodies

71, 72, 73 and 74. The heater 6 coated outside the metal pressure-bearing shell 1 is used for maintaining the process temperature of the fluid in the pipeline.

Structurally, the two sides of the damping part 2 are connected with the fluid input pipeline 31 and the fluid output pipeline 32 by adopting a staggered step structure, wherein the damping part 2 is closely contacted with the corresponding pipeline close to one side of the fluid, and the damping part 2

forms buffer cavities

21 and 22 with the fluid input pipeline 31 and the fluid output pipeline 32 respectively at the step part far away from one side of the fluid so as to be used as a buffer deformation space after the damping part 2 is deformed.

One side of the pressure spring 51 abuts against the step surface of the boss 33 projecting from the outer edge of the fluid feed pipe 31, and the other side abuts against the inner side surface 43 of the end cover 41. One side of the corresponding pressure spring 52 abuts against the step surface of the boss 34 projecting from the outer edge of the fluid delivery pipe 32, and the other side abuts against the inner side surface 43 of the end cover 41.

An O-shaped elastic body 71 is arranged between the end gland 41 and the fluid input pipeline 31, and an O-shaped elastic body 74 is arranged between the end gland 42 and the fluid output pipeline 32. An O-shaped elastic body 72 is arranged between the fluid input pipeline 31 and the metal pressure-bearing shell 1, and an O-shaped elastic body 73 is arranged between the fluid output pipeline 32 and the metal pressure-bearing shell 1. The material of each O-type elastomer is preferably FFMK rubber. Each O-ring elastomer functions as vibration isolation (non-sealing function).

The end covers 41 and 42 on both sides are respectively connected and fixed with the corresponding connecting

holes

11 and 12 on the metal pressure-bearing shell 1 through connecting parts by connecting

holes

45 and 46. Thereby keeping the entire damping device forming a relatively closed connecting sleeve/connecting tube structure.

The high-performance vibration-damping composite material pipeline used in the invention has the advantages that the internal damping part has good high-temperature resistance, corrosion resistance and creep deformation functions, the metal pipeline coated outside has pressure resistance, the composite material pipeline has the functions of conveying fluid, damping and reducing noise of an equipment system, has excellent performances of balancing and adjusting system vibration and the like, and can be widely applied to the fields of the industries such as aerospace, aviation, medical treatment, chemical industry and the like.

The parameters of the fluid to be treated are as follows: the working temperature is 350-0 ℃, the corrosion resistance is realized, the working medium is molten plastic or gas media such as hot air, chemical gas and the like, and the working pressure of the product is less than 90 MPa.

Correspondingly, the high-temperature creep resistant material forming the damping part 2 can be selected from silicon rubber, fluorine-containing rubber, rubber material containing benzene rings or a mixture of the silicon rubber, the fluorine-containing rubber, the rubber material containing benzene rings, and the working temperature of the material is between 350 ℃ and 0 ℃, namely the material is high-temperature resistant, corrosion resistant and creep resistant. The temperature-resistant range is 0-350 ℃, and more preferably 20-250 ℃. FFMK rubbers are preferred.

The metallic pressure-containing casing 1, the exterior of which is a cladding material, may be selected from metallic materials or replaced by other suitable materials in order to withstand the pressure conducted by the internal fluid. The bearing pressure is 5-90MPa, preferably 10-30 MPa.

The heater 6 is intended to maintain the system at a constant temperature, and has a heating function to prevent the molten fluid from cooling. Accordingly, it is preferable to coat the heater 6 with an insulating layer, so that the layered pipe becomes a 4-layer structure.

As described above, the interior material is characterized by high viscoelasticity, and in addition to elastic deformation of molecules, "creep" or molecular slip occurs between polymer chains, so that it has excellent properties in terms of buffering, vibration damping and dynamic use, i.e., hysteresis, damping and reversible creep properties.

For example, the elasticity of silicone rubber is completely generated by the change of the coiled molecular structure, and the molecular chain movement is hindered due to the interaction between silicone rubber molecules, and the silicone rubber is viscous, so that the stress and the strain are in a non-equilibrium state. The force acting on the silicone rubber molecules, one part of which is used for overcoming the viscous resistance between the molecules, absorbs part of energy in the process of viscous friction, and the other part of which deforms the molecular chains, and the two parts form the viscoelasticity of the silicone rubber.

In order to ensure the stretching deformation of the flexible body (i.e. the damping part 2), the elastically deformed pressure-bearing

springs

51 and 52 between the damping part 2 and the metal pressure-bearing shell 1 and the fluid input/output pipelines at two sides are also needed to absorb the vibration generated by the deformation of the damping part, and the pressure-bearing capacity of the system is also adjusted by the pressure-bearing springs and the connecting pipelines; while each O-ring is responsible for counteracting the vibration rather than sealing.

In particular, the high performance vibration damped composite conduits provided by the present invention allow for the reduction of the detrimental factors generated by mechanical vibrations and conduit vibrations through the characteristics of the internal elastomeric material and the particular structural differentiation of the external conduit. The two parts of the composite material pipe supplement each other, the inner rubber part plays a role in damping due to high-performance elastic creep and resists high temperature and corrosion, and the outer metal part plays a role in strengthening and supporting, pressure resistance and heat preservation.

The invention relates to a novel composite material pipeline damping vibration attenuation method and a system device, which are particularly used for damping vibration attenuation during high-temperature and high-pressure fluid medium transmission in an extrusion and blow molding linkage system, and provide a high-performance damping composite material pipeline, wherein the innermost layer of the pipeline has good heat resistance to play a damping role, the outer coating material has pressure resistance to bear high pressure, and the novel composite material pipeline damping vibration attenuation method and the system device are characterized in that the outer layer coats the inner layer, but the inner layer can creep to generate a damping effect. The damping part is used for absorbing the deformation stress generated by the inner layer damping part, and the system has the function of adjusting the pressure change. The composite material pipe has the functions of conveying fluid, damping vibration and reducing noise of equipment system. The auxiliary parts of the composite material pipeline damping vibration attenuation system comprise a pipeline connecting part, an inner layer damping material vibration generating attenuation part, a sealing part, a heating and constant temperature maintaining part and an operation parameter adjusting part (referring to elastic pressure selection of a spring). The method and system can effectively damp vibration and ensure that the required vibration damping system operates within the allowable vibration range.

In addition, the vibration source to which it is connected may be 1 or more. The number of systems requiring vibration damping operation may also be 1 or more. The damping system can also be 1 or more, and when a plurality of damping systems are arranged, the damping systems can be connected in series or in parallel or a combination of the damping systems.

Claims

1. A pipeline damping vibration damper for an extrusion and blow molding linkage system is of a connecting sleeve body structure, one end of the connecting sleeve body is connected with a fluid input pipeline leading from a vibration source, the other end of the connecting sleeve body is connected with a fluid output pipeline, and a first end cover and a second end cover are respectively arranged at two ends of the connecting sleeve body along the flowing direction of a fluid,

the connecting sleeve body at least comprises a section of fluid channel used for fluid conveying, the fluid channel comprises an input end and an output end, the input end is connected with the fluid input pipeline led from the vibration source, and the output end is connected with the fluid output pipeline; the fluid channel is of a layered structure, the inner wall of the fluid channel is a high-temperature creep resistant material layer, and the outer side of the high-temperature creep resistant material layer is sequentially coated with a heat-conducting pressure-bearing shell or a heat-conducting pressure-bearing layer and a heating layer from inside to outside; a first pressure-bearing spring is sleeved at the outer edge of the fluid input pipeline, one end of the first pressure-bearing spring is abutted against a bulge on the outer wall of the fluid input pipeline, and the other end of the first pressure-bearing spring is abutted against the inner side end of the first end cover; and a second pressure-bearing spring is sleeved at the outer edge of the fluid output pipeline, one end of the second pressure-bearing spring is abutted against the bulge on the outer wall of the fluid output pipeline, and the other end of the second pressure-bearing spring is abutted against the inner side end of the second end cover.

2. The pipe damping vibration isolator for extrusion and blow molding linkage system of claim 1, wherein the outer diameter of said high temperature creep resistant material layer is not less than the outer diameter of said fluid input pipe and its outer wall protrusion.

3. The pipe damping vibration attenuation device for the extrusion and blow molding linkage system according to claim 1 or 2, characterized in that the adjacent fluid input pipeline is not in complete contact with the high temperature creep resistant material layer of the fluid channel, and a buffer space for the high temperature creep resistant material layer after deformation is kept at the adjacent position.

4. The pipe damping vibration attenuation device for the extrusion and blow molding linkage system according to claim 1 or 2, characterized in that the adjacent fluid output pipelines are not in complete contact with the high temperature creep resistant material layer of the fluid channel, and a buffer space for the high temperature creep resistant material layer after deformation is kept at the adjacent position.

5. The pipe damping vibration attenuation device for the extrusion and blow molding linkage system according to the claim 1 or 2, characterized in that an elastic isolation member is arranged between the heat-conducting pressure-bearing shell or the heat-conducting pressure-bearing layer and the fluid input pipeline; an elastic isolation piece is arranged between the heat-conducting pressure-bearing shell or the heat-conducting pressure-bearing layer and the fluid output pipeline.

6. The pipe damping vibration attenuation device for the extrusion and blow molding linkage system according to claim 1 or 2, wherein the outer side of the heating layer is further coated with an insulating layer.

7. The tube damping vibration isolator for extrusion and blow molding linkage system of claim 3 wherein adjacent fluid input lines contact at least the fluid-proximate side of the high temperature creep-resistant material layer of the fluid passageway.

8. The tube damping vibration isolator for extrusion and blow molding linkage system according to claim 3, wherein adjacent fluid output lines contact at least the fluid-proximate side of the high temperature creep-resistant material layer of the fluid channel.

9. The pipe damping vibration attenuation device for the extrusion and blow molding linkage system according to claim 1 or 2, wherein the high temperature creep resistant material layer is one or a mixture of more of silicone rubber, fluorine-containing rubber and rubber containing benzene rings.

10. The pipe damping vibration isolator for extrusion and blow molding linkage system of claim 9 wherein said high temperature creep resistant material layer is FFMK rubber.

11. The pipe damping vibration isolator for an extrusion and blow molding linkage system of claim 5 wherein each elastomeric isolator is a high temperature creep resistant material O-ring.

12. The pipe damping vibration isolator for extrusion and blow molding linkage system of claim 1 wherein said thermally conductive pressure-containing housing is a metal housing.

13. The pipe damping vibration attenuation device for the extrusion and blow molding linkage system according to claim 1 or 12, wherein the pressure-bearing shell or the pressure-bearing layer with heat conductivity has a pressure-bearing range of 5-90 MPa.

14. The pipe damping vibration isolator for extrusion and blow molding linkage system according to claim 13, wherein said thermally conductive pressure-bearing shell or layer has a pressure-bearing range of 10-30 MPa.

15. The pipe damping vibration attenuation device for the extrusion and blow molding linkage system according to claim 1, wherein the high temperature creep resistant material layer has a temperature resistance range of 0-350 ℃.

16. The pipe damping vibration isolator for extrusion and blow molding linkage system of claim 15 wherein said high temperature creep resistant material layer has a temperature resistance in the range of 20-250 ℃.

17. A method of damping vibration in a pipe for an extrusion and blow molding linkage system, comprising:

(1) adopting a layered composite fluid channel as a connecting channel of a fluid input pipeline and a fluid output pipeline; the innermost layer of the connecting channel layered structure is provided with a high-temperature-resistant material layer with creep property for absorbing vibration waves, and the outer layer is sequentially coated with a pressure-bearing shell and a heating functional layer;

18. The method of claim 17, further comprising the step of using an elastomer to counteract shock waves from collisions between the fluid input and output lines and the pressure containing housing.