CN111349289A - High-strength trenchless MPP power cable protection pipe and preparation method thereof - Google Patents
High-strength trenchless MPP power cable protection pipe and preparation method thereof Download PDFInfo
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- CN111349289A CN111349289A CN202010313488.9A CN202010313488A CN111349289A CN 111349289 A CN111349289 A CN 111349289A CN 202010313488 A CN202010313488 A CN 202010313488A CN 111349289 A CN111349289 A CN 111349289A
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
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- C08L2203/20—Applications use in electrical or conductive gadgets
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Abstract
The invention discloses a high-strength trenchless MPP power cable protection pipe which is composed of the following raw materials in parts by weight: 20-22 parts of modified polypropylene, 10-15 parts of silicone rubber, 5-7 parts of a heat insulating agent, 5-5.5 parts of glass fiber, 4-5 parts of steel fiber and 8-10 parts of bromide flame retardant, wherein the heat insulating agent is prepared from the following raw materials in parts by weight: 10-12 parts of perlite, 6-7 parts of carbon powder, 1-2 parts of quartz sand and 4-6 parts of polyurethane. When the trenchless MPP power cable protection pipe is manufactured, the heat insulation performance of the MPP pipe is effectively improved by adding the heat insulation agent, and meanwhile, the MPP pipe is prepared by mixing the modified polypropylene raw material and the silicon rubber, so that the strength of the MPP pipe is greatly improved.
Description
Technical Field
The invention relates to the field of cable pipes, in particular to a high-strength trenchless MPP power cable protection pipe and a preparation method thereof.
Background
The cable protection pipe is named as a cable pipe, a power cable pipe, a cement cable pipe, a power calandria, a power cable protection pipe and the like, is mainly installed in a section where a communication cable and a power line intersect, prevents the power line from being broken to cause a short-circuit accident, and causes the communication cable and a steel wire rope to be electrified so as to protect the cable, and belongs to one type of cable protection pipe.
The existing trenchless MPP power cable protection pipe has the advantages of relatively common strength after preparation, short service life and common heat insulation performance; the condition that the material blockked up appears easily in its granulation in-process when current non-excavation MPP power cable protection tube is preparing influences going on smoothly of granulation step, and is inconvenient after the granulation to collect the particulate matter, causes the influence for processing step on next step, influences the efficiency of whole preparation process.
Disclosure of Invention
The invention aims to provide a high-strength trenchless MPP power cable protection pipe and a preparation method thereof, and the invention can effectively solve the problems that the existing trenchless MPP power cable protection pipe has more general strength after preparation, shorter service life and general heat preservation performance; the condition that the material blockked up appears easily in its granulation in-process when current non-excavation MPP power cable protection tube is preparing influences going on smoothly of granulation step, and is inconvenient after the granulation to collect the particulate matter, causes the influence for processing step on next step, influences the problem of the efficiency of whole preparation process.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a non-excavation MPP power cable protection tube of high strength, this MPP power cable protection tube comprises following part by weight raw materials: 20-22 parts of modified polypropylene, 10-15 parts of silicone rubber, 5-7 parts of a heat insulating agent, 5-5.5 parts of glass fiber, 4-5 parts of steel fiber and 8-10 parts of bromide flame retardant;
the heat preservation agent is prepared from the following raw materials in parts by weight: 10-12 parts of perlite, 6-7 parts of carbon powder, 1-2 parts of quartz sand and 4-6 parts of polyurethane;
the heat preservation agent is prepared by the following steps:
the method comprises the following steps: firstly, mixing perlite and polyurethane by using mixing equipment, and then filtering the mixture of the perlite and the polyurethane by using a filter screen;
step two: grinding the filtered mixture of the perlite and the polyurethane by using a grinding device, and grinding the mixture of the perlite and the polyurethane into powder;
step three: mixing and stirring the ground powder of the carbon powder, the quartz sand and the mixture of the perlite and the polyurethane, and controlling the stirring time to be 10-15min to prepare mixed powder;
step four: taking out the mixed powder and putting the mixed powder into drying equipment for drying, wherein the drying temperature of the drying equipment is controlled to be 75-80 ℃, and the drying time is 45-50 min;
step five: naturally cooling the dried mixed powder, grinding the dried mixed powder by using grinding equipment again, and collecting the ground mixed powder to prepare a heat-insulating agent;
the MPP power cable protection pipe mainly comprises the following steps during preparation:
step A: firstly, respectively heating the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber in parts by weight by using heating equipment, so that the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber are softened after being heated;
and B: heating and softening modified polypropylene, silicon rubber, glass fiber and steel fiber, stirring by using a stirring device, simultaneously adding 8-10 parts of bromide flame retardant and 5-7 parts of heat insulating agent into the mixture, stirring simultaneously to prepare an MPP mixture formed by mixing the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber, and then cooling the mixture by using cooling equipment;
and C: b, cutting the MPP mixture cooled in the step B by using a cutting device, and cutting the MPP mixture into a plurality of pieces;
step D: and (3) putting the MPP mixture after cutting into a granulating device for granulating, wherein the granulating device mainly comprises the following steps of:
step a: firstly, a driving motor inside a motor box is electrified and started, the driving motor drives a connecting shaft to rotate after being electrified, the connecting shaft drives a driving shaft to rotate, and the driving shaft penetrates through a bearing seat to drive a spiral feeding rod to rotate;
step b: the MPP mixer is characterized in that a stepping motor is arranged on the outer side of a feed hopper and connected with a second rotating wheel, the stepping motor is used for driving the second rotating wheel to rotate, the second rotating wheel is used for driving a first rotating wheel to rotate through a transmission belt, a controller is used for controlling the stepping motor to rotate 60-70 degrees instantaneously and then reset, the stepping motor rotates 60-70 degrees anticlockwise, a blocky MPP mixture after cutting is fed from the feed hopper, a swinging block is driven by the first rotating wheel to swing on two sides in the horizontal direction, the MPP mixture is uniformly distributed in an upper trough, a guide rod is driven by the second rotating wheel to rotate, the MPP mixture is fed into a feed inlet from two sides of the MPP mixture, and then the MPP mixture enters the interior;
step c: the MPP mixture entering the protective box moves towards the direction of the discharging plate under the rotation of the spiral feeding rod, then enters the granulating box through the discharging plate, the driving motor drives the blades inside the granulating box to rotate, and the MPP mixture sent out from the discharging plate is crushed into particles under the cutting of the blades;
step d: the granular MPP mixture enters a discharge hopper, then enters a guide pipe, is supplied with air by a fan, is sent into a collecting cylinder, is guided by an inclined guide plate, vibrates the bottom of the collecting cylinder by a vibration motor, sequentially sends the MPP mixture particles into a discharge pipe, and then uniformly collects the MPP mixture particles at one end of the discharge pipe;
step E: and D, extruding the MPP mixture particles collected in the step D by using an extruding machine to obtain the MPP power cable protection pipe.
Preferably, the heating temperature of the modified polypropylene in the step A is 150-155 ℃, the heating temperature of the silicone rubber is 100-120 ℃, the heating temperature of the glass fiber is 500-550 ℃, and the heating temperature of the steel fiber is 800-950 ℃.
Preferably, the MPP mixture in step C has a cut length of 20-25cm and a cut width of 10-15 cm.
A preparation method of a high-strength trenchless MPP power cable protection pipe specifically comprises the following steps:
s1: firstly, respectively heating the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber in parts by weight by using heating equipment, so that the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber are softened after being heated;
s2: heating and softening modified polypropylene, silicon rubber, glass fiber and steel fiber, stirring by using a stirring device, simultaneously adding 8-10 parts of bromide flame retardant and 5-7 parts of heat insulating agent into the mixture, stirring simultaneously to prepare an MPP mixture formed by mixing the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber, and then cooling the mixture by using cooling equipment;
s3: b, cutting the MPP mixture cooled in the step B by using a cutting device, and cutting the MPP mixture into a plurality of pieces;
s4: putting the cut MPP mixture into granulation equipment for granulation, and uniformly collecting the granulated MPP mixture;
s5: and D, extruding the MPP mixture particles collected in the step D by using an extruding machine to obtain the MPP power cable protection pipe.
Preferably, granulation equipment includes the main tank body, and the equal fixed mounting of guard box and motor case is at the top of main tank body, and the motor case is installed in one side of guard box, and driving motor's bottom is provided with the support.
Preferably, the support is sleeved on the outer side of the collecting barrel, the top end and the bottom end of the support are both arranged in a circular ring shape, and the diameter of the top of the support is smaller than that of the bottom of the support.
Preferably, the inside both sides wall of going up the silo all is provided with the limiting plate, and the relative lateral wall of two sets of limiting plates all is the slope form setting.
Preferably, when the granulation equipment in the step D is used, a driving motor inside a motor box is firstly powered on, the driving motor drives a connecting shaft to rotate after being powered on, the connecting shaft drives a driving shaft to rotate, the driving shaft passes through a bearing seat to drive a spiral feeding rod to rotate, a stepping motor is arranged on the outer side of a feeding hopper and connected with a second rotating wheel, the stepping motor drives the second rotating wheel to rotate, the second rotating wheel drives a first rotating wheel to rotate through a driving belt, a controller controls the stepping motor to rotate 60-70 degrees instantaneously and then reset, then the stepping motor rotates 60-70 degrees anticlockwise, the cut blocky MPP mixture is fed from the feeding hopper, a swinging block is driven by the first rotating wheel to swing on two sides in the horizontal direction, the MPP mixture is uniformly distributed inside an upper trough, a guide rod is driven by the second rotating wheel to rotate, and the MPP mixture is fed into a feeding hole from two sides of, enter into the inside of protective housing afterwards, the MPP mixture that enters into the inside of protective housing removes to the direction of play flitch under the rotation of screw feed pole, later through going out the flitch and entering into in the middle of the granulation case, the blade that drives the granulation incasement portion by driving motor rotates, the MPP mixture that sends out from going out the flitch smashes into the graininess under the cutting of blade, graininess MPP mixture enters into out the hopper in the middle of, later enter into the pipe, by the fan air supply, send into in the middle of the collecting vessel with graininess MPP mixture, the granule that enters into the collecting vessel is guided by oblique baffle, it shakes the bottom of collecting vessel to vibrate the motor, in the middle of sending into row material pipe with MPP mixture granule in proper order, later in the one end of row material pipe to MPP mixture granule unify and collect, accomplish the granulation operation.
The invention has the beneficial effects that:
according to the invention, the heat insulating agent is mixed with the raw materials in parts by weight, and the modified polypropylene, the silicone rubber, the glass fiber and the steel fiber in parts by weight are respectively heated and softened independently and then mixed, so that the condition that the common heating and mixing are not uniform due to different softening points of the raw materials is effectively avoided, and the heat insulating agent is simultaneously mixed while the raw materials are mixed, thereby ensuring the heat insulating property of the post-prepared trenchless-excavated MPP power cable protection pipe, and avoiding the influence of the temperature on the service performance of the power cable inside the trenchless MPP power cable protection pipe after the trenchless MPP power cable protection pipe is pre-buried;
by mixing the silicon rubber and the modified polypropylene, the elasticity and high and low temperature resistance of the silicon rubber are utilized, and the strength provided by the modified polypropylene is matched, so that the formed trenchless MPP power cable protection pipe has the advantages of tensile resistance and good elasticity, and the whole trenchless MPP power cable protection pipe has higher strength by matching with the mixing of the glass fiber and the steel fiber;
when the MPP mixture is granulated, a first rotating wheel is arranged on the inner side of a feed hopper of granulating equipment and matched with a second rotating wheel, a stepping motor is used for driving the second rotating wheel to rotate, the second rotating wheel is used for driving the first rotating wheel to rotate through a transmission belt, a controller is used for controlling the stepping motor to rotate for 60-70 degrees instantaneously and then reset, then the stepping motor rotates for 60-70 degrees anticlockwise, the cut blocky MPP mixture is fed from the feed hopper, a swinging block swings on two sides in the horizontal direction along with the driving of the first rotating wheel, the MPP mixture is uniformly distributed in a feeding groove, a guide rod is driven by the second rotating wheel to rotate, the MPP mixture is fed into a feed inlet from two sides of the MPP mixture and then enters a protective box, the condition that the granulating equipment is blocked during granulation can be avoided, and the smooth granulation step is ensured;
set up fan joint guide pipe cooperation surge drum through one side at granulation equipment, MPP mixture granule after handling from the granulation case at first enters into out the hopper, enter into the pipe afterwards, directly can blow in the middle of the surge drum with the MPP mixture under the effect of fan, thereby can unify the collection to MPP mixture granule, it can go on rapidly to have guaranteed that the extrusion molding processing step, the trouble of collecting the MPP particulate matter alone has been saved, the preparation efficiency of whole non-excavation MPP power cable protection pipe has been improved.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a structural diagram of a granulation apparatus in a high-strength trenchless MPP power cable protection pipe according to the present invention.
Figure 2 is a cross-sectional view of a motor case of a pelletizing apparatus in a high strength trenchless MPP power cable protection tube of the present invention.
Figure 3 is a cross-sectional view of a collection cylinder of a pelletizing apparatus in a high strength trenchless MPP power cable protection tube of the present invention.
Fig. 4 is a diagram of a protective box of a granulation device in a high-strength trenchless MPP power cable protective tube according to the present invention.
Figure 5 is a cross-sectional view of the feed hopper of the pelletizing apparatus in a high strength trenchless MPP power cable protection tube of the present invention.
In the figure: 1. a main box body; 2. a motor case; 3. a protective box; 4. a feed hopper; 5. a drive shaft; 6. a granulation box; 7. a drive motor; 8. a discharge hopper; 9. a conduit; 10. a fan; 11. a collection canister; 12. a discharge pipe; 13. a support; 14. a support; 15. a drive motor; 16. a connecting shaft; 17. an oscillation motor; 18. an inclined guide plate; 19. a bearing seat; 20. a screw feed rod; 21. a discharge plate; 22. a feed inlet; 23. a feeding trough; 24. a limiting plate; 25. a first runner; 26. a swing block; 27. a second runner; 28. a guide rod; 29. a transmission belt.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, a high-strength non-excavation MPP power cable protection tube is disclosed, which is composed of the following raw materials by weight: 20-22 parts of modified polypropylene, 10-15 parts of silicone rubber, 5-7 parts of a heat insulating agent, 5-5.5 parts of glass fiber, 4-5 parts of steel fiber and 8-10 parts of bromide flame retardant;
the heat preservation agent is prepared from the following raw materials in parts by weight: 10-12 parts of perlite, 6-7 parts of carbon powder, 1-2 parts of quartz sand and 4-6 parts of polyurethane;
the heat preservation agent is prepared by the following steps:
the method comprises the following steps: firstly, mixing perlite and polyurethane by using mixing equipment, and then filtering the mixture of the perlite and the polyurethane by using a filter screen;
step two: grinding the filtered mixture of the perlite and the polyurethane by using a grinding device, and grinding the mixture of the perlite and the polyurethane into powder;
step three: mixing and stirring the ground powder of the carbon powder, the quartz sand and the mixture of the perlite and the polyurethane, and controlling the stirring time to be 10-15min to prepare mixed powder;
step four: taking out the mixed powder and putting the mixed powder into drying equipment for drying, wherein the drying temperature of the drying equipment is controlled to be 75-80 ℃, and the drying time is 45-50 min;
step five: naturally cooling the dried mixed powder, grinding the dried mixed powder by using grinding equipment again, and collecting the ground mixed powder to prepare a heat-insulating agent;
the MPP power cable protection pipe mainly comprises the following steps during preparation:
step A: firstly, respectively heating the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber in parts by weight by using heating equipment, so that the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber are softened after being heated;
and B: heating and softening modified polypropylene, silicon rubber, glass fiber and steel fiber, stirring by using a stirring device, simultaneously adding 8-10 parts of bromide flame retardant and 5-7 parts of heat insulating agent into the mixture, stirring simultaneously to prepare an MPP mixture formed by mixing the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber, and then cooling the mixture by using cooling equipment;
and C: b, cutting the MPP mixture cooled in the step B by using a cutting device, and cutting the MPP mixture into a plurality of pieces;
step D: and (3) putting the MPP mixture after cutting into a granulating device for granulating, wherein the granulating device mainly comprises the following steps of:
step a: firstly, a driving motor 15 in a motor box 2 is electrified and started, the driving motor 15 drives a connecting shaft 16 to rotate after being electrified, the connecting shaft 16 drives a driving shaft 5 to rotate, and the driving shaft 5 penetrates through a bearing seat 19 to drive a spiral feeding rod 20 to rotate;
step b: a stepping motor is arranged on the outer side of the feed hopper 4 and connected with a second rotating wheel 27, the stepping motor is used for driving the second rotating wheel 27 to rotate, the second rotating wheel 27 is used for driving a first rotating wheel 25 to rotate through a transmission belt 29, a controller is used for controlling the stepping motor to rotate for 60-70 degrees instantaneously and then reset, then the stepping motor rotates for 60-70 degrees anticlockwise, the MPP mixture which is cut into blocks is thrown into the feed hopper 4, the swinging block 26 is driven by the first rotating wheel 25 to swing on two sides in the horizontal direction, the MPP mixture is uniformly distributed in the upper trough 23, the second rotating wheel 27 is used for driving a guide rod 28 to rotate, the MPP mixture is fed into the feed inlet 22 from two sides of the MPP mixture, and then the MPP mixture enters the protective box 3;
step c: the MPP mixture entering the protective box 3 moves towards the direction of the discharging plate 21 under the rotation of the screw feeding rod 20, then enters the granulating box 6 through the discharging plate 21, the driving motor 7 drives the blades inside the granulating box 6 to rotate, and the MPP mixture sent out from the discharging plate 21 is crushed into particles under the cutting of the blades;
step d: the granular MPP mixture enters a discharge hopper 8, then enters a guide pipe 9, is supplied with air by a fan 10, and is sent to a collecting cylinder 11, the granules entering the collecting cylinder 11 are guided by an inclined guide plate 18, a vibration motor 17 vibrates the bottom of the collecting cylinder 11, the MPP mixture granules are sent to a discharge pipe 12 in sequence, and then the MPP mixture granules are uniformly collected at one end of the discharge pipe 12;
step E: and D, extruding the MPP mixture particles collected in the step D by using an extruding machine to obtain the MPP power cable protection pipe.
In the step A, the heating temperature of the modified polypropylene is 150-155 ℃, the heating temperature of the silicon rubber is 100-120 ℃, the heating temperature of the glass fiber is 500-550 ℃, and the heating temperature of the steel fiber is 800-950 ℃.
And C, the length of the MPP mixture after cutting is 20-25cm, the width of the MPP mixture after cutting is 10-15cm, and the length and the width of the MPP mixture after mixing are limited, so that the feeding operation is convenient to carry out.
A preparation method of a high-strength trenchless MPP power cable protection pipe specifically comprises the following steps:
s1: firstly, respectively heating the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber in parts by weight by using heating equipment, so that the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber are softened after being heated;
s2: heating and softening modified polypropylene, silicon rubber, glass fiber and steel fiber, stirring by using a stirring device, simultaneously adding 8-10 parts of bromide flame retardant and 5-7 parts of heat insulating agent into the mixture, stirring simultaneously to prepare an MPP mixture formed by mixing the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber, and then cooling the mixture by using cooling equipment;
s3: b, cutting the MPP mixture cooled in the step B by using a cutting device, and cutting the MPP mixture into a plurality of pieces;
s4: putting the cut MPP mixture into granulation equipment for granulation, and uniformly collecting the granulated MPP mixture;
s5: and D, extruding the MPP mixture particles collected in the step D by using an extruding machine to obtain the MPP power cable protection pipe.
Granulation equipment includes main tank body 1, and the equal fixed mounting of guard box 3 and motor case 2 is at the top of main tank body 1, and motor case 2 installs in one side of guard box 3, and driving motor 15's bottom is provided with support 14, utilizes support 14 to support driving motor 15.
Support 13 has been cup jointed in the outside of surge drum 11, and the top and the bottom of support 13 all are the ring form setting, and support 13 top diameter is less than its bottom diameter, and support 13 supports surge drum 11.
Limiting plates 24 are arranged on two side walls in the feeding groove 23, opposite side walls of the two groups of limiting plates 24 are arranged in an inclined mode, and the limiting plates 24 are arranged to play a good material guiding effect.
When the granulation equipment in the step D is used, firstly, a driving motor 15 in a motor box 2 is electrified and started, the driving motor 15 drives a connecting shaft 16 to rotate after being electrified, the connecting shaft 16 drives a driving shaft 5 to rotate, the driving shaft 5 passes through a bearing seat 19 to drive a spiral feeding rod 20 to rotate, a stepping motor is arranged on the outer side of a feed hopper 4 and is connected with a second rotating wheel 27, the stepping motor drives the second rotating wheel 27 to rotate, the second rotating wheel 27 drives a first rotating wheel 25 to rotate through a driving belt 29, a controller controls the stepping motor to rotate 60-70 degrees instantaneously and then reset, then the stepping motor rotates 60-70 degrees anticlockwise, the cut blocky MPP mixture is put into the feed hopper 4, the swinging blocks 26 are driven by the first rotating wheel 25 to swing on two sides in the horizontal direction, the MPP mixture is uniformly distributed in an upper trough 23, and the model of the controller is GPU228, the guide rod 28 is driven by the second rotating wheel 27 to rotate, MPP mixture is sent into the feed inlet 22 from two sides of the MPP mixture, then the MPP mixture enters the interior of the protective box 3, the MPP mixture entering the interior of the protective box 3 moves towards the direction of the discharge plate 21 under the rotation of the screw feeding rod 20, then the MPP mixture enters the granulating box 6 through the discharge plate 21, the blade in the interior of the granulating box 6 is driven to rotate by the driving motor 7, the MPP mixture sent out from the discharge plate 21 is crushed into granules under the cutting of the blade, the granular MPP mixture enters the discharge hopper 8 and then enters the guide pipe 9, the granular MPP mixture is sent into the collecting cylinder 11 by the fan 10, the granules entering the collecting cylinder 11 are guided by the inclined guide plate 18, the vibration motor 17 vibrates the bottom of the collecting cylinder 11, the MPP mixture granules are sent into the discharge pipe 12 in turn, then the MPP mixture granules are collected uniformly at one end of the discharge pipe 12, the granulation operation was completed.
According to the invention, the heat insulating agent is mixed with the raw materials in parts by weight, and the modified polypropylene, the silicone rubber, the glass fiber and the steel fiber in parts by weight are respectively heated and softened independently and then mixed, so that the condition that the common heating and mixing are not uniform due to different softening points of the raw materials is effectively avoided, and the heat insulating agent is simultaneously mixed while the raw materials are mixed, thereby ensuring the heat insulating property of the post-prepared trenchless-excavated MPP power cable protection pipe, and avoiding the influence of the temperature on the service performance of the power cable inside the trenchless MPP power cable protection pipe after the trenchless MPP power cable protection pipe is pre-buried; by mixing the silicon rubber and the modified polypropylene, the elasticity and high and low temperature resistance of the silicon rubber are utilized, and the strength provided by the modified polypropylene is matched, so that the formed trenchless MPP power cable protection pipe has the advantages of tensile resistance and good elasticity, and the whole trenchless MPP power cable protection pipe has higher strength by matching with the mixing of the glass fiber and the steel fiber; when the MPP mixture is granulated, the first rotating wheel 25 is arranged on the inner side of the feed hopper 4 of the granulating device to be matched with the second rotating wheel 27, the second rotating wheel 27 is driven to rotate by the stepping motor, the first rotating wheel 25 is driven to rotate by the second rotating wheel 27 through the transmission belt 29, the controller is used for controlling the stepping motor to rotate 60-70 degrees instantaneously and then reset, then the MPP mixture which is cut into blocks is put into the feed hopper 4 by rotating 60 to 70 degrees counterclockwise, the swinging block 26 is driven by the first rotating wheel 25 to swing at two sides in the horizontal direction, the MPP mixture is evenly distributed in the upper material groove 23, the guide rod 28 is driven by the second rotating wheel 27 to rotate, the MPP mixture is sent into the feed inlet 22 from two sides and then enters the inside of the protective box 3, further, the situation that granulation equipment is blocked during granulation can be avoided, and the smooth operation of the granulation step is ensured; set up fan 10 and connect 9 cooperation surge drums 11 of pipe through one side at granulation equipment, MPP mixture granule after 6 handles from the granulation case at first enters into out hopper 8, enter into pipe 9 afterwards, directly can blow in the middle of the surge drum 11 with the MPP mixture under fan 10's effect, thereby can unify the collection to MPP mixture granule, it can go on rapidly to have guaranteed that the extrusion molding processing step, the trouble of collecting the MPP particulate matter alone has been saved, the preparation efficiency of whole non-excavation MPP power cable protection pipe has been improved.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. The utility model provides a non-excavation MPP power cable protection pipe of high strength which characterized in that, this MPP power cable protection pipe comprises following parts by weight raw materials: 20-22 parts of modified polypropylene, 10-15 parts of silicone rubber, 5-7 parts of a heat insulating agent, 5-5.5 parts of glass fiber, 4-5 parts of steel fiber and 8-10 parts of bromide flame retardant;
the heat preservation agent is prepared from the following raw materials in parts by weight: 10-12 parts of perlite, 6-7 parts of carbon powder, 1-2 parts of quartz sand and 4-6 parts of polyurethane;
the heat preservation agent is prepared by the following steps:
the method comprises the following steps: firstly, mixing perlite and polyurethane by using mixing equipment, and then filtering the mixture of the perlite and the polyurethane by using a filter screen;
step two: grinding the filtered mixture of the perlite and the polyurethane by using a grinding device, and grinding the mixture of the perlite and the polyurethane into powder;
step three: mixing and stirring the ground powder of the carbon powder, the quartz sand and the mixture of the perlite and the polyurethane, and controlling the stirring time to be 10-15min to prepare mixed powder;
step four: taking out the mixed powder and putting the mixed powder into drying equipment for drying, wherein the drying temperature of the drying equipment is controlled to be 75-80 ℃, and the drying time is 45-50 min;
step five: naturally cooling the dried mixed powder, grinding the dried mixed powder by using grinding equipment again, and collecting the ground mixed powder to prepare a heat-insulating agent;
the MPP power cable protection pipe mainly comprises the following steps during preparation:
step A: firstly, respectively heating the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber in parts by weight by using heating equipment, so that the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber are softened after being heated;
and B: heating and softening modified polypropylene, silicon rubber, glass fiber and steel fiber, stirring by using a stirring device, simultaneously adding 8-10 parts of bromide flame retardant and 5-7 parts of heat insulating agent into the mixture, stirring simultaneously to prepare an MPP mixture formed by mixing the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber, and then cooling the mixture by using cooling equipment;
and C: b, cutting the MPP mixture cooled in the step B by using a cutting device, and cutting the MPP mixture into a plurality of pieces;
step D: and (3) putting the MPP mixture after cutting into a granulating device for granulating, wherein the granulating device mainly comprises the following steps of:
step a: firstly, a driving motor (15) in a motor box (2) is electrified to be started, the driving motor (15) drives a connecting shaft (16) to rotate after being electrified, the connecting shaft (16) drives a driving shaft (5) to rotate, and the driving shaft (5) penetrates through a bearing seat (19) to drive a spiral feeding rod (20) to rotate;
step b: a stepping motor is arranged on the outer side of the feed hopper (4) and connected with a second rotating wheel (27), the stepping motor is used for driving the second rotating wheel (27) to rotate, the second rotating wheel (27) drives a first rotating wheel (25) to rotate through a transmission belt (29), a controller is used for controlling the stepping motor to rotate for 60-70 degrees instantaneously and then reset, then the stepping motor rotates for 60-70 degrees anticlockwise, the cut blocky MPP mixture is fed from the feed hopper (4), a swinging block (26) is driven by the first rotating wheel (25) to swing on two sides in the horizontal direction, the MPP mixture is uniformly distributed in an upper trough (23), a guide rod (28) is driven by the second rotating wheel (27) to rotate, and the MPP mixture is fed into a feed inlet (22) from two sides of the MPP mixture and then enters into a protective box (3);
step c: the MPP mixture entering the protective box (3) moves towards the direction of the discharging plate (21) under the rotation of the screw feeding rod (20), then enters the granulating box (6) through the discharging plate (21), a blade inside the granulating box (6) is driven to rotate by the driving motor (7), and the MPP mixture sent out from the discharging plate (21) is crushed into particles under the cutting of the blade;
step d: the granular MPP mixture enters a discharge hopper (8), then enters a guide pipe (9), is supplied with air by a fan (10), and is sent into a collecting cylinder (11), the granules entering the collecting cylinder (11) are guided by an inclined guide plate (18), a vibration motor (17) vibrates the bottom of the collecting cylinder (11), and the MPP mixture granules are sent into a discharge pipe (12) in sequence, and then are uniformly collected at one end of the discharge pipe (12);
step E: and D, extruding the MPP mixture particles collected in the step D by using an extruding machine to obtain the MPP power cable protection pipe.
2. The MPP power cable protection tube with high strength as set forth in claim 1, wherein the heating temperature of the modified polypropylene in step A is 150-155 ℃, the heating temperature of the silicone rubber is 100-120 ℃, the heating temperature of the glass fiber is 500-550 ℃, and the heating temperature of the steel fiber is 800-950 ℃.
3. The high strength trenchless MPP power cable protective tube of claim 1 wherein the MPP mixture in step C is cut to a length of 20-25cm and a width of 10-15 cm.
4. A preparation method of a high-strength trenchless MPP power cable protection pipe is characterized by comprising the following steps:
s1: firstly, respectively heating the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber in parts by weight by using heating equipment, so that the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber are softened after being heated;
s2: heating and softening modified polypropylene, silicon rubber, glass fiber and steel fiber, stirring by using a stirring device, simultaneously adding 8-10 parts of bromide flame retardant and 5-7 parts of heat insulating agent into the mixture, stirring simultaneously to prepare an MPP mixture formed by mixing the modified polypropylene, the silicon rubber, the glass fiber and the steel fiber, and then cooling the mixture by using cooling equipment;
s3: b, cutting the MPP mixture cooled in the step B by using a cutting device, and cutting the MPP mixture into a plurality of pieces;
s4: putting the cut MPP mixture into granulation equipment for granulation, and uniformly collecting the granulated MPP mixture;
s5: and D, extruding the MPP mixture particles collected in the step D by using an extruding machine to obtain the MPP power cable protection pipe.
5. The high-strength trenchless MPP power cable protection tube as claimed in claim 1, wherein the granulation equipment comprises a main box body (1), the protection box (3) and the motor box (2) are both fixedly installed on the top of the main box body (1), the motor box (2) is installed on one side of the protection box (3), and a support (14) is arranged at the bottom of the driving motor (15).
6. The high-strength trenchless MPP power cable protection tube as claimed in claim 1, wherein a support (13) is sleeved outside the collection cylinder (11), the top end and the bottom end of the support (13) are both arranged in a circular ring shape, and the diameter of the top of the support (13) is smaller than that of the bottom of the support.
7. The high-strength trenchless MPP power cable protection tube as claimed in claim 1, wherein the inner two side walls of the feeding trough (23) are provided with limiting plates (24), and the opposite side walls of the two groups of limiting plates (24) are inclined.
8. The MPP power cable protection tube of claim 1, wherein in step D, the granulation device is powered on and started by the driving motor (15) inside the motor box (2), the driving motor (15) drives the connecting shaft (16) to rotate after being powered on, the connecting shaft (16) drives the driving shaft (5) to rotate, the driving shaft (5) passes through the bearing seat (19) to drive the screw feeding rod (20) to rotate, the stepping motor is installed outside the feeding hopper (4) and connected with the second rotating wheel (27), the stepping motor drives the second rotating wheel (27) to rotate, the second rotating wheel (27) drives the first rotating wheel (25) to rotate by the driving belt (29), the controller controls the stepping motor to rotate 60-70 degrees instantaneously and then reset, and then rotates 60-70 degrees counterclockwise, the MPP mixture which is block after being cut is fed from the feeding hopper (4), the MPP mixture is uniformly distributed in an upper material tank (23) along with the swinging of a swinging block (26) driven by a first rotating wheel (25) on two sides in the horizontal direction, the MPP mixture is conveyed into a feeding hole (22) from two sides of the MPP mixture and then enters a protective box (3), the MPP mixture entering the protective box (3) moves towards a discharging plate (21) under the rotation of a spiral feeding rod (20), then enters a granulating box (6) through the discharging plate (21), a blade inside the granulating box (6) is driven to rotate by a driving motor (7), the MPP mixture conveyed out of the discharging plate (21) is crushed into particles under the cutting of the blade, the MPP mixture enters a discharging hopper (8) and then enters a guide pipe (9), and is blown by a fan (10), the granular MPP mixture is sent into a collecting cylinder (11), particles entering the collecting cylinder (11) are guided by an inclined guide plate (18), a vibration motor (17) vibrates the bottom of the collecting cylinder (11), the MPP mixture particles are sent into a discharging pipe (12) in sequence, and then the MPP mixture particles are uniformly collected at one end of the discharging pipe (12) to complete granulation operation.
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| CN202010313488.9A CN111349289A (en) | 2020-04-20 | 2020-04-20 | High-strength trenchless MPP power cable protection pipe and preparation method thereof |
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| CN202010313488.9A CN111349289A (en) | 2020-04-20 | 2020-04-20 | High-strength trenchless MPP power cable protection pipe and preparation method thereof |
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