A device and method for alleviating blockage in the vacuum system of a polyester production unit.

Abstract

The invention relates to a device for alleviating blockage of a vacuum system of a polyester production device and a method for alleviating blockage of the device. The device comprises a scraper condenser, a first-stage jet pump, a first-stage condensation tank, a second-stage jet pump, a second-stage condensation tank, a third-stage jet pump, a third-stage condensation tank, a second-stage semi-jet pump, a gas phase pipeline, an ethylene glycol flushing pipeline, a first ball valve, a second ball valve and a dredging device which are connected in sequence. The dredging device comprises a dredging guide pipe, a common ball valve, a spare ball valve and a solid dredging pipe. The first ball valve and the second ball valve are opened to allow hot ethylene glycol to enter the gas phase pipeline and take away accumulated materials after alcoholysis. The common valve and the spare valve are opened to allow the solid dredging pipe to pass through the dredging guide pipe to dredge the outlet of the two-stage semi-jet pump and the inlet of the first-stage jet pump.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, in particular to a device for alleviating blockage of a vacuum system of a polyester production device and a method for alleviating blockage of the device. Background Art

[0002] At present, the vacuum systems widely used in the production process of polyester melt-spinning polyester have more or less the problem of vacuum pipeline blockage and easy accumulation of materials. According to the mechanism of polycondensation reaction, EG and water are separated from the material in the polycondensation reactor, which is inevitably accompanied by mist entrainment. There are some oligomers and polycondensates in the mist entrainment. Due to their certain viscosity, they are very easy to settle in the pipeline in the vacuum system of the polycondensation reactor. Once they are allowed to settle in the pipeline, they will only accumulate more and more, and eventually completely block the pipeline, thereby affecting the stable operation of the device and product quality. There are many factors that affect mist entrainment, and there are actually only two fundamental reasons. One is the design defects of the vacuum device design itself. For example, there are turns in the vacuum pipeline, which is easy to accumulate materials. You can try to change it when you stop the machine for maintenance. The other is that the process platform is not established properly. If this is the problem, it is very difficult to adjust, because melt spinning is a continuous production device, and the designs of different devices are not the same. For example, the polyester device in this workshop produces 400,000 tons per year. In the normal production process, the process parameters cannot be easily adjusted significantly. Generally, the adjustment range will not be too large, and the effect will not be obvious in a short time. It is time-consuming and laborious. Sometimes, the process platform has not been perfected, and the vacuum system has completely failed and has to be stopped for maintenance. Therefore, leaving aside the design defect problem, the traditional treatment method is just to adjust the process platform appropriately first, and then stop for maintenance if it really doesn't work. However, such treatment is risky, and the car has to be stopped if you are not careful, and there is no guarantee that the re-established process platform can completely solve the vacuum problem. Therefore, whether it is possible to establish a treatment device and method specifically for vacuum system blockage to alleviate the problem of vacuum system blockage, thereby providing a lot of time for establishing a reasonable process platform is a problem that this patent urgently needs to solve, and it is necessary to make improvements. Summary of the invention

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide a targeted, effective and immediate device and method for alleviating blockage in the vacuum system of a polyester production device.

[0004] The technical solution of the present invention is achieved as follows: a device for alleviating blockage of a vacuum system of a polyester production device, comprising a scraper condenser, a first-stage jet pump, a first-stage condensation tank, a second-stage jet pump, a second-stage condensation tank, a third-stage jet pump, and a third-stage condensation tank connected in sequence, and also provided with a second-stage semi-jet pump, the output end of the second-stage semi-jet pump is connected to the second-stage condensation tank, and the input end is connected to a gas phase pipeline, characterized in that: it also includes an ethylene glycol flushing pipeline connected to the gas phase pipeline through two branch pipes, each branch pipe is respectively installed with a first ball valve and a second ball valve, and a dredging device is provided on the input pipe of the first-stage jet pump and the side wall of the second-stage condensation tank, the dredging device includes a dredging guide pipe, a common ball valve and a spare ball valve arranged on the dredging guide pipe, and also includes a solid dredging pipe that can pass through the dredging guide pipe and extend into the input pipe of the first-stage jet pump or into the input end of the second-stage jet pump.

[0005] By adopting the above technical scheme, in daily use, under the premise of ensuring that production is not greatly affected, the first ball valve and the second ball valve are opened, and a proper amount of hot ethylene glycol is flushed into the easily blocked gas phase pipeline for a long time through the ethylene glycol flushing pipeline and the branch pipe. The hydroxyl group of ethylene glycol can be used to decompose the alcoholysis of polyester polymer to decompose the accumulated materials attached to the wall of the gas phase pipeline. In order to prevent the accumulation of alcoholysis accumulated materials, a proper amount of hot ethylene glycol can be intermittently flushed in for a short time to take away the accumulated materials after alcoholysis to dredge the guiding pipeline. The flushed accumulated materials are flushed to the outlet of the secondary jet pump, and the condensate is flushed into the liquid seal tank of the tertiary jet pump through the secondary condensation tank, and is removed by the filter before the ethylene glycol circulation pump. At present, the workshop uses this method to clean up a large amount of residues from the gas phase pipeline of the vacuum system. , the effect is remarkable; on the other hand, when it is necessary to dredge the outlet of the two-stage and a half jet pump or the inlet of the first-stage jet pump, three operators are prepared first. Operator No. 1 first puts the solid dredging pipe into the dredging guide pipe. Operator No. 2 puts on asbestos gloves and uses a rag to block the inlet of the variable-diameter dredging guide pipe with the solid dredging pipe to prevent the system from breaking the vacuum during operation. Operator No. 3 opens the common ball valve in turn, and then opens the spare ball valve. After the common ball valve and the spare ball valve are opened, operator No. 1 uses the solid dredging pipe to dredge the outlet of the two-stage and a half jet pump and the inlet of the first-stage jet pump. At present, the workshop dredges these two pipelines once a day to ensure that the pipelines here remain unobstructed, which can detect abnormalities in advance and ensure that the pipelines here remain unobstructed.

[0006] The present invention is further configured as follows: the first ball valve, the second ball valve, the common ball valve and the spare ball valve have the same structure, all of which include a valve body with an installation groove, a valve ball movably arranged in the valve body, a sealing ring arranged in the valve body and located on both sides of the valve ball, a sealing packing and a packing gland arranged in the installation groove, a valve stem rotatably installed in the middle and bottom end of the packing gland and connected to the valve ball, and a handle for driving the valve stem to rotate, the packing gland is provided with a self-locking device and an unlocking device for respectively fixing the rotated valve stem and releasing the fixation of the valve stem by the self-locking device, the self-locking device includes an installation cavity arranged at the top of the packing gland, a first slide plate movably installed at the bottom of the installation cavity and rotatable around its axis, a through hole arranged on the edge of the first slide plate, a locking device arranged at the bottom of the installation cavity and capable of being lifted and lowered into the through hole, an unlocking transmission device arranged in the installation cavity and located above the first slide plate and capable of being lifted and lowered to push the locking device out of the through hole, and the handle is installed on the unlocking transmission device to drive the unlocking transmission device to lift and lower.

[0007] By adopting the above technical solution, in daily use, when it is necessary to open or close the first ball valve, the second ball valve, the commonly used ball valve or the spare ball valve, the unlocking transmission device is driven down by the handle to push the locking device out of the through hole, and the staff drives the unlocking transmission device to rotate by the handle, and the first slide plate drives the valve stem to drive the valve ball to rotate in the valve body, so that the channel in the valve body is opened or closed, and then the unlocking transmission device is driven up by the handle, and the locking device returns to the through hole to limit the rotation of the first slide plate. In this way, it is possible to avoid the first ball valve, the second ball valve, the commonly used ball valve or the spare ball valve being inadvertently opened or the opening being adjusted due to accidental touch or inadvertent collision, thereby preventing the entire system from failing.

[0008] The present invention is further configured as follows: the locking device includes a first blind hole arranged at the bottom of the installation cavity, a first spring installed in the first blind hole, and a slider installed on the top of the first spring, and a latch pin adapted to the through hole is provided on the top of the slider.

[0009] By adopting the above technical solution, in daily use, when the unlocking transmission device descends, the pin is pushed downward, causing the slider to move downward in the first blind hole, and the first spring is compressed and contracts. When the unlocking transmission device rises, the first spring that has lost pressure recovers, causing the slider to drive the pin to rise and be inserted into the through hole again, thereby limiting the rotation of the first slide plate in the installation cavity and fixing the position of the valve ball.

[0010] The present invention is further configured as follows: the unlocking transmission device includes a second slide plate movably installed in the installation cavity and capable of being raised and lowered and rotated around its own axis, a push rod arranged at the bottom of the second slide plate and adapted to the through hole, and a blocking cover movably installed on the top of the packing gland to prevent the second slide plate from escaping from the installation cavity; one end of the handle is hinged to one side of the top surface of the blocking cover; a pillar is provided on the top of the second slide plate, and the pillar passes through the blocking cover and is slidably connected to the handle through a movable connection device.

[0011] By adopting the above technical solution, in daily use, when it is necessary to push the pin downward out of the through hole, the staff holds the handle away from one end of the handle where it is hinged with the plug cover, presses this end downward, and the movable connection device slides on the handle, driving the pillar to move, driving the second slide plate to move downward in the installation cavity until the push rod extends into the through hole, until the pin is completely out of the through hole. At this time, the first slide plate and the second slide plate are temporarily fixedly connected by the cooperation of the push rod and the through hole, and then the staff drives the plug cover and the second slide plate to rotate by the handle, drives the first slide plate to rotate, and causes the valve stem to rotate accordingly. Conversely, when the position of the first slide plate needs to be fixed, the staff releases the handle, and under the action of the first spring, the slider drives the plug pin to rise and insert into the through hole, pushes the push rod out of the through hole, and releases the temporary fixed connection between the first slide plate and the second slide plate. At this time, the first slide plate and the installation cavity are fixedly connected by the cooperation of the plug and the through hole. In this way, the fixation of the first slide plate is released or completed.

[0012] The present invention is further configured as follows: the plugging cover includes a cover plate, a first clamping edge arranged on the top of the outer side wall of the packing gland, two groups of balls respectively movably arranged on the top and bottom of the first clamping edge and equidistantly distributed along the circumferential direction, and a surrounding plate fixedly installed on the bottom of the cover plate by screws, and the inner side of the surrounding plate is provided with a second clamping edge whose top surface abuts against the lower side balls.

[0013] By adopting the above technical solution, in daily use, when the plugging cover is installed, the enclosure is installed on the bottom of the cover plate by screws, so that the top surface of the second card edge and a group of balls movably installed on the bottom surface of the first card edge are movably matched, and the bottom surface of the plugging cover and a group of balls movably installed on the top surface of the first card edge are movably matched. When the staff turns the handle, the plugging cover is rotated by the two groups of balls respectively matching the plugging cover and the second card edge, and through the arrangement of the first card edge and the second card edge, the plugging cover will not fall off from the top of the stuffing gland, so that the second slide plate will not fall out of the installation cavity.

[0014] The present invention is further configured as follows: the movable connection device includes third clamping edges arranged on both sides of the bottom of the handle, a sliding frame that is slidably engaged with the third clamping edges on both sides and movably installed at the bottom of the handle, and the top of the pillar is hinged to the bottom surface of the sliding frame.

[0015] By adopting the above technical solution, in daily use, the sliding frame and the third clamping edges on both sides cooperate with each other. When the handle rotates around its hinge point with the cover plate, the sliding frame slides at the bottom of the handle to transfer pressure to the pillar to make the pillar descend.

[0016] The present invention is further configured as follows: a first annular groove and a second annular groove are respectively provided at the top edge of the first slide plate and the bottom edge of the second slide plate, and a second spring is provided in the first annular groove and the second annular groove.

[0017] By adopting the above technical solution, in daily use, through the setting of the second spring, when the staff presses down the handle to temporarily fix the first slide plate and the second slide plate through the cooperation of the push rod and the through hole, the second spring installed in the first annular groove and the second annular groove is squeezed and shortened, accumulating elastic force. When the staff releases the handle, the second spring loses pressure and recovers under the action of elastic force, pushing the second slide plate to rise, so that the push rod can quickly move away from the through hole.

[0018] The present invention is further configured as follows: a second blind hole extending into the valve stem is provided on the top of the first slide plate, and a guide column at least partially inserted into the second blind hole and slidingly matched with the second blind hole is provided on the bottom of the second slide plate.

[0019] By adopting the above technical solution, in daily use, through the cooperation of the second blind hole and the guide column, when the second slide plate is raised or lowered, it is ensured that the second slide plate will not shake, so that the push rod can be accurately inserted into the through hole.

[0020] The present invention is further configured as follows: two oppositely arranged baffles are fixedly arranged on the top surface of the cover plate, a limiting groove is formed between the opposite side walls of the two baffles for sliding cooperation with the front end of the handle, and reinforcing ribs connected to the top surface of the cover plate are provided on the opposite sides of the two baffles.

[0021] By adopting the above technical solution, in daily use, when the staff rotates the handle downward around one end of the hinge with the cover plate, it enters the limit groove, and the two sides of the handle abut against the opposite side walls of the limit groove. When the staff drives the cover plate to rotate through the handle, it can withstand pressure and prevent the sliding frame from being damaged due to excessive pressure and unable to slide normally at the bottom of the handle.

[0022] The present invention also discloses a mitigation method, which is characterized by comprising the following steps:

[0023] S1. Open the first ball valve and the second ball valve, and flush a proper amount of hot ethylene glycol into the gas phase pipeline that is prone to blockage. Use the alcoholysis chemical principle of ethylene glycol to decompose the accumulated materials attached to the wall of the gas phase pipeline. To prevent the accumulation of accumulated materials after alcoholysis, a proper amount of hot ethylene glycol can be intermittently flushed in for a short period of time to remove the accumulated materials after alcoholysis and dredge the gas phase pipeline;

[0024] S2. Prepare three operators. Operator No. 1 first inserts the solid dredging pipe into the dredging guide pipe;

[0025] S3. Operator No. 2 puts on asbestos gloves and uses a rag to block the inlet of the variable diameter dredging guide pipe with the solid dredging pipe to prevent the system from breaking the vacuum during operation;

[0026] Operators S4 and No. 3 opened the common ball valves in turn, and then opened the spare ball valves;

[0027] S5. After the common ball valve and the spare ball valve are opened, operator No. 1 uses a solid clearing pipe to clear the outlet of the two-stage half-jet pump and the inlet of the first-stage jet pump.

[0028] By adopting the above technical solution, in daily use, although this mitigation method cannot solve the problem of vacuum pipeline blockage from the root, it can only play a mitigation role, but its role is to greatly extend the period of the polyester device to deal with vacuum pipeline blockage. Except for the blockage caused by the design defects of the vacuum system itself, it can provide a large number of cycles for the polyester production device to establish a reasonable process platform, thereby eliminating the problem of vacuum pipeline blockage from the root. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 It is a schematic diagram of the overall structure of a specific implementation method of the present invention.

[0031] Figure 2 for Figure 1 Schematic diagram of the cross-section structure along the AA direction.

[0032] Figure 3 It is a schematic diagram of the valve body structure of a specific embodiment of the present invention.

[0033] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0034] The symbols in the figure are:

[0035] 1 scraper condenser, 2 first-stage jet pump, 3 first-stage condensate tank, 4 second-stage jet pump, 5 second-stage condensate tank, 7 third-stage jet pump, 8 third-stage condensate tank, 10 second-stage semi-jet pump, 11 gas phase pipeline, 12 branch pipe, 13 glycol flushing pipeline, 14 first ball valve, 15 second ball valve, 16 dredging guide pipe, 17 common ball valve, 18 spare ball valve, 19 solid dredging pipe, 20 installation groove, 21 valve body, 22 valve ball, 23 sealing ring, 24 sealing packing, 25 packing gland, 2 6 valve stem, 27 handle, 28 installation cavity, 29 first slide plate, 30 through hole, 31 first blind hole, 32 first spring, 33 slider, 34 latch, 35 second slide plate, 36 push rod, 37 pillar, 38 cover plate, 39 first clamping edge, 40 ball bearing, 41 enclosure plate, 42 second clamping edge, 43 third clamping edge, 44 sliding frame, 45 first annular groove, 46 second annular groove, 47 second spring, 48 second blind hole, 49 guide column, 50 baffle plate, 51 limit groove, 52 reinforcing rib plate. DETAILED DESCRIPTION

[0036] 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.

[0037] like Figure 1 Figure 4 As shown, the present invention discloses a device for alleviating blockage of a vacuum system of a polyester production device, comprising a scraper condenser 1, a primary jet pump 2, a primary condensation tank 3, a secondary jet pump 4, a secondary condensation tank 5, a tertiary jet pump 7, and a tertiary condensation tank 8 connected in sequence, and a secondary semi-jet pump 10 is also provided, wherein the output end of the secondary semi-jet pump 10 is connected to the secondary condensation tank 5, and the input end is connected to a gas phase pipeline 11. In a specific embodiment of the present invention, an ethylene glycol flushing pipeline 13 connected to the gas phase pipeline 11 through two branch pipes 12 is also provided, and each branch pipe 12 is respectively installed with a first ball valve 14 and a second ball valve 15, and a dredging device is provided on the input pipe of the primary jet pump 2 and the side wall of the secondary condensation tank 5, wherein the dredging device comprises a dredging guide pipe 16, a common ball valve 17 and a spare ball valve 18 arranged on the dredging guide pipe 16, and further comprises a solid dredging pipe 19 which can pass through the dredging guide pipe 16 and extend into the input pipe of the primary jet pump 2 or into the input end of the secondary jet pump 4.

[0038] By adopting the above technical scheme, in daily use, under the premise of ensuring that the production is not greatly affected, the first ball valve 14 and the second ball valve 15 are opened, and a proper amount of hot ethylene glycol is flushed into the easily blocked section gas phase pipeline 11 for a long time through the ethylene glycol flushing pipeline 13 and the branch pipe 12. The hydroxyl group of ethylene glycol can be used to decompose the alcoholysis of polyester polymer to decompose the accumulated materials attached to the wall of the gas phase pipeline 11. In order to prevent the accumulation of accumulated materials after alcoholysis, a proper amount of hot ethylene glycol can be intermittently flushed in for a short time to remove the accumulated materials after alcoholysis to clear the guide pipe 16 line. The flushed accumulated materials are flushed to the outlet of the secondary jet pump 4, and the condensate is flushed into the liquid seal groove of the tertiary jet pump 7 through the secondary condensation tank 5, and is removed by the filter before the ethylene glycol circulation pump. At present, the workshop uses this method to clean up a large amount of residues from the vacuum system gas phase pipeline 11, which is effective. The effect is remarkable; on the other hand, when it is necessary to dredge the outlet of the two-stage semi-jet pump 10 or the inlet of the first-stage jet pump 2, three operators are prepared first. Operator No. 1 first puts the solid dredging pipe 19 into the dredging guide pipe 16, and operator No. 2 puts on asbestos gloves and uses a rag to block the inlet of the variable diameter dredging guide pipe 16 with the solid dredging pipe 19 to prevent the system from breaking the vacuum during operation. Operator No. 3 opens the common ball valve 17 and then the spare ball valve 18 in turn. After the common ball valve 17 and the spare ball valve 18 are opened, operator No. 1 uses the solid dredging pipe 19 to dredge the outlet of the two-stage semi-jet pump 10 and the inlet of the first-stage jet pump 2. At present, the workshop dredges these two pipelines once a day to ensure that the pipelines here remain unobstructed, which can detect abnormalities in advance and ensure that the pipelines here remain unobstructed.

[0039] In a specific embodiment of the present invention: the first ball valve 14, the second ball valve 15, the common ball valve 17 and the spare ball valve 18 have the same structure, and all include a valve body 21 with a mounting groove 20, a valve ball 22 movably arranged in the valve body 21, a sealing ring 23 arranged in the valve body 21 and located on both sides of the valve ball 22, a sealing packing 24 and a packing gland 25 arranged in the mounting groove 20, a valve stem 26 rotatably installed in the packing gland 25 and connected to the valve ball 22 at the bottom end, and a handle 27 for driving the valve stem 26 to rotate, and the packing gland 25 is provided with a self-locking device and an unlocking device for respectively rotating The valve stem 26 after movement is fixed and the self-locking device that fixes the valve stem 26 is released. The self-locking device includes an installation cavity 28 arranged at the top of the packing gland 25, a first slide plate 29 movably installed at the bottom of the installation cavity 28 and rotatable around its axis, a through hole 30 arranged on the edge of the first slide plate 29, a locking device arranged at the bottom of the installation cavity 28 and capable of being lifted and lowered into the through hole 30, and an unlocking transmission device arranged in the installation cavity 28 and located above the first slide plate 29 and capable of being lifted and lowered to push the locking device out of the through hole 30. The handle 27 is installed on the unlocking transmission device to drive the unlocking transmission device to rise and fall.

[0040] By adopting the above technical solution, in daily use, when it is necessary to open or close the first ball valve 14, the second ball valve 15, the common ball valve 17 or the spare ball valve 18, the unlocking transmission device is driven down by the handle 27 to push the locking device out of the through hole 30, and the staff drives the unlocking transmission device to rotate by the handle 27, and the first slide plate 29 drives the valve stem 26 to drive the valve ball 22 to rotate in the valve body 21, so that the channel in the valve body 21 is opened or closed, and then the unlocking transmission device is driven up by the handle 27, and the locking device returns to the through hole 30 to limit the rotation of the first slide plate 29. In this way, it is avoided that the first ball valve 14, the second ball valve 15, the common ball valve 17 or the spare ball valve 18 is accidentally opened or the opening is adjusted due to accidental touch or inadvertent collision, which causes the whole system to fail.

[0041] In a specific embodiment of the present invention: the locking device includes a first blind hole 31 arranged at the bottom of the installation cavity 28, a first spring 32 installed in the first blind hole 31, and a slider 33 installed on the top of the first spring 32, and a pin 34 adapted to the through hole 30 is provided on the top of the slider 33.

[0042] By adopting the above technical solution, in daily use, when the unlocking transmission device descends, the pin 34 is pushed downward, so that the slider 33 moves downward in the first blind hole 31, and the first spring 32 is compressed and contracts. When the unlocking transmission device rises, the first spring 32 that has lost pressure recovers, so that the slider 33 drives the pin 34 to rise and is inserted into the through hole 30 again, thereby limiting the rotation of the first slide plate 29 in the mounting cavity 28, so that the position of the valve ball 22 is fixed.

[0043] In a specific embodiment of the present invention: the unlocking transmission device includes a second slide plate 35 movably installed in the installation cavity 28 and capable of being raised and lowered and rotated around its own axis, a push rod 36 arranged at the bottom of the second slide plate 35 and adapted to the through hole 30, and a blocking cover movably installed on the top of the stuffing gland 25 to prevent the second slide plate 35 from escaping from the installation cavity 28, one end of the handle 27 is hinged to one side of the top surface of the blocking cover, and a pillar 37 is provided on the top of the second slide plate 35, and the pillar 37 passes through the blocking cover and is slidably connected to the handle 27 through a movable connection device.

[0044] By adopting the above technical solution, in daily use, when it is necessary to push the latch 34 downward out of the through hole 30, the staff holds the handle 27 away from the end where it is hinged with the plug cover, presses this end downward, and the movable connection device slides on the handle 27, driving the support 37 to move, driving the second slide plate 35 to move downward in the installation cavity 28 until the push rod 36 extends into the through hole 30, until the latch 34 is completely out of the through hole 30, at this time, the first slide plate 29 and the second slide plate 35 are temporarily fixedly connected through the cooperation of the push rod 36 and the through hole 30, and then the staff drives the plug cover and The second slide plate 35 rotates, driving the first slide plate 29 to rotate, causing the valve stem 26 to rotate accordingly. Conversely, when the position of the first slide plate 29 needs to be fixed, the staff releases the handle 27, and under the action of the first spring 32, the slider 33 drives the latch 34 to rise and insert into the through hole 30, and the push rod 36 is pushed out of the through hole 30, so that the temporary fixed connection between the first slide plate 29 and the second slide plate 35 is released. At this time, the first slide plate 29 and the mounting cavity 28 are fixedly connected by the cooperation of the latch 34 and the through hole 30. In this way, the fixation of the first slide plate 29 is released or completed.

[0045] In a specific embodiment of the present invention: the plugging cover includes a cover plate 38, a first clamping edge 39 arranged at the top of the outer side wall of the packing gland 25, two groups of balls 40 movably arranged at the top and bottom of the first clamping edge 39 and equidistantly distributed along the circumferential direction, and a surrounding plate 41 fixedly installed at the bottom of the cover plate 38 by screws, and the inner side of the surrounding plate 41 is provided with a second clamping edge 42 whose top surface abuts against the lower ball 40.

[0046] By adopting the above technical solution, in daily use, when the plugging cover is installed, the enclosure 41 is installed on the bottom of the cover plate 38 by screws, so that the top surface of the second clamping edge 42 and a group of balls 40 movably installed on the bottom surface of the first clamping edge 39 can be movably matched, and the bottom surface of the plugging cover and a group of balls 40 movably installed on the top surface of the first clamping edge 39 can be movably matched. When the staff turns the handle 27, the plugging cover is rotated by the two groups of balls 40 respectively matching with the plugging cover and the second clamping edge 42, and by the arrangement of the first clamping edge 39 and the second clamping edge 42, the plugging cover will not fall off from the top of the stuffing gland 25, so that the second slide plate 35 will not fall out of the installation cavity 28.

[0047] In a specific embodiment of the present invention: the movable connection device includes a third clamping edge 43 arranged on both sides of the bottom of the handle 27, a sliding frame 44 that is slidably engaged with the third clamping edges 43 on both sides and movably installed at the bottom of the handle 27, and the top of the pillar 37 is hinged to the bottom surface of the sliding frame 44.

[0048] By adopting the above technical solution, in daily use, through the cooperation between the sliding frame 44 and the third clamping edges 43 on both sides, when the handle 27 rotates around the hinge point between it and the cover plate 38, the sliding frame 44 slides at the bottom of the handle 27, and transmits pressure to the support 37 to make the support 37 descend.

[0049] In a specific embodiment of the present invention, a first annular groove 45 and a second annular groove 46 are respectively formed on the top edge of the first slide plate 29 and the bottom edge of the second slide plate 35 , and a second spring 47 is formed in the first annular groove 45 and the second annular groove 46 .

[0050] By adopting the above technical solution, in daily use, through the provision of the second spring 47, when the staff presses down the handle 27 to temporarily fix the first slide 29 and the second slide 35 with the through hole 30 through the push rod 36, the second spring 47 installed in the first annular groove 45 and the second annular groove 46 is squeezed and shortened, accumulating elastic force. When the staff releases the handle 27, the second spring 47 loses pressure and recovers under the action of the elastic force, pushing the second slide 35 up, so that the push rod 36 can quickly move away from the through hole 30.

[0051] In a specific embodiment of the present invention: a second blind hole 48 extending into the valve stem 26 is provided at the top of the first slide plate 29 , and a guide column 49 at least partially inserted in the second blind hole 48 and slidingly matched with the second blind hole 48 is provided at the bottom of the second slide plate 35 .

[0052] By adopting the above technical solution, in daily use, through the cooperation of the second blind hole 48 and the guide column 49, when the second slide plate 35 is raised or lowered, it is ensured that the second slide plate 35 will not shake when it is raised or lowered, so that the push rod 36 can be accurately inserted into the through hole 30.

[0053] In a specific embodiment of the present invention: two oppositely arranged baffles 50 are fixedly arranged on the top surface of the cover plate 38, and a limiting groove 51 is formed between the opposite side walls of the two baffles 50 for sliding cooperation with the front end of the handle 27, and reinforcing ribs 52 connected to the top surface of the cover plate 38 are provided on the opposite sides of the two baffles 50.

[0054] By adopting the above technical solution, in daily use, when the staff rotates the handle 27 downward around one end of the hinge with the cover 38, it enters the limit groove 51, and the two sides of the handle 27 abut against the opposite side walls of the limit groove 51. When the staff drives the cover 38 to rotate through the handle 27, it can withstand the pressure and prevent the sliding frame 44 from being damaged due to excessive pressure and unable to slide normally at the bottom of the handle 27.

[0055] The present invention also discloses a mitigation method, which in a specific embodiment of the present invention comprises the following steps: S1, opening the first ball valve 14 and the second ball valve 15, and flushing a proper amount of hot ethylene glycol into the easily blocked section of the gas phase pipeline 11, and utilizing the alcoholysis chemical principle of ethylene glycol to decompose the accumulated materials attached to the pipe wall of the gas phase pipeline 11. In order to prevent the accumulated materials from alcoholysis from accumulating, an appropriate amount of hot ethylene glycol may be intermittently flushed in for a short period of time to remove the accumulated materials after alcoholysis and clear the gas phase pipeline 11;

[0056] S2, prepare three operators, operator No. 1 first inserts the solid dredging pipe 19 into the dredging guide pipe 16;

[0057] S3. Operator No. 2 puts on asbestos gloves and uses a rag to block the inlet of the variable diameter dredging guide pipe 16 where the solid dredging pipe 19 is placed to prevent the system from breaking the vacuum during operation;

[0058] S4, Operator No. 3 opens the common ball valve 17 and then the spare ball valve 18 in sequence;

[0059] S5. After the common ball valve 17 and the spare ball valve 18 are opened, operator No. 1 uses the solid dredging pipe 19 to dredge the outlet of the two-stage half jet pump 10 and the inlet of the first-stage jet pump 2.

[0060] By adopting the above technical solution, in daily use, although this mitigation method cannot solve the problem of vacuum pipeline blockage from the root, it can only play a mitigation role, but its role is to greatly extend the period of the polyester device to deal with vacuum pipeline blockage. Except for the blockage caused by the design defects of the vacuum system itself, it can provide a large number of cycles for the polyester production device to establish a reasonable process platform, thereby eliminating the problem of vacuum pipeline blockage from the root.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for alleviating blockage of a vacuum system of a polyester production device, comprising a scraper condenser (1), a primary jet pump (2), a primary condensation tank (3), a secondary jet pump (4), a secondary condensation tank (5), a tertiary jet pump (7), and a tertiary condensation tank (8) connected in sequence, and further provided with a secondary semi-jet pump (10), wherein the output end of the secondary semi-jet pump (10) is connected to the secondary condensation tank (5), and the input end is connected to a gas phase pipeline (11), characterized in that: It also includes an ethylene glycol flushing pipeline (13) connected to the gas phase pipeline (11) through two branch pipes (12), each branch pipe (12) is respectively installed with a first ball valve (14) and a second ball valve (15), the input pipe of the first-stage jet pump (2) and the side wall of the second-stage condenser (5) are both provided with a dredging device, the dredging device includes a dredging guide pipe (16), a common ball valve (17) and a spare ball valve (18) arranged on the dredging guide pipe (16), and also includes a solid dredging pipe (19) extending through the dredging guide pipe (16) into the input pipe of the first-stage jet pump (2) or into the input end of the second-stage jet pump (4); the first ball valve The second ball valve (14), the second ball valve (15), the common ball valve (17) and the spare ball valve (18) have the same structure, and all include a valve body (21) with a mounting groove (20), a valve ball (22) movably arranged in the valve body (21), a sealing ring (23) arranged in the valve body (21) and located on both sides of the valve ball (22), a sealing packing (24) and a packing gland (25) arranged in the mounting groove (20), a valve stem (26) rotatably mounted in the packing gland (25) and connected to the valve ball (22) at the bottom end, and a handle (27) for driving the valve stem (26) to rotate, wherein the packing gland (25) is provided with a self-locking device and an unlocking device for respectively locking the valve stem (26) and locking the valve ball (22). The self-locking device is used to fix and release the valve stem (26) after rotation. The self-locking device comprises a mounting cavity (28) arranged at the top of a packing gland (25), a first slide plate (29) movably mounted at the bottom of the mounting cavity (28) and rotating around its axis, a through hole (30) arranged on the edge of the first slide plate (29), a locking device arranged at the bottom of the mounting cavity (28) and lifting and entering the through hole (30), and an unlocking transmission device arranged in the mounting cavity (28) and located above the first slide plate (29) and lifting and pushing the locking device out of the through hole (30). The handle (27) is mounted on the unlocking transmission device and used to drive the unlocking The transmission device is raised and lowered; the first ball valve (14) and the second ball valve (15) are opened, and a proper amount of hot ethylene glycol is flushed into the easily blocked section of the gas phase pipeline (11) for a long time through the ethylene glycol flushing pipeline (13) and the branch pipe (12), and the accumulated materials attached to the wall of the gas phase pipeline (11) are decomposed by the alcoholysis of polyester polymers by the hydroxyl alcoholysis of ethylene glycol. In order to prevent the accumulation of alcoholysis accumulated materials, a proper amount of hot ethylene glycol is intermittently flushed in for a short time to remove the alcoholysis accumulated materials through the dredging guide pipe (16), and the flushed accumulated materials are flushed to the outlet of the secondary jet pump (4), and the condensate is flushed into the liquid seal groove of the tertiary jet pump (7) through the secondary condensation tank (5), and is removed through the filter before the ethylene glycol circulation pump.

2. The device for alleviating blockage of a vacuum system of a polyester production device according to claim 1, characterized in that: The locking device comprises a first blind hole (31) arranged at the bottom of the installation cavity (28), a first spring (32) installed in the first blind hole (31), and a slider (33) installed on the top of the first spring (32), wherein a latch (34) matching the through hole (30) is provided on the top of the slider (33).

3. The device for alleviating blockage of a vacuum system of a polyester production device according to claim 2, characterized in that: The unlocking transmission device comprises a second slide plate (35) movably mounted in the mounting cavity (28) and capable of being raised and lowered and rotating around its own axis, a push rod (36) arranged at the bottom of the second slide plate (35) and adapted to the through hole (30), and a plug cover movably mounted on the top of the packing gland (25) for preventing the second slide plate (35) from escaping from the mounting cavity (28), one end of the handle (27) being hinged to one side of the top surface of the plug cover, and a pillar (37) being arranged at the top of the second slide plate (35), and the pillar (37) being slidably connected to the handle (27) through a movable connection device after passing through the plug cover.

4. The device for alleviating blockage of a vacuum system of a polyester production device according to claim 3, characterized in that: The plugging cover comprises a cover plate (38), a first clamping edge (39) arranged at the top of the outer side wall of the packing gland (25), two groups of balls (40) movably arranged at the top and bottom of the first clamping edge (39) and equidistantly distributed along the circumferential direction, and a surrounding plate (41) fixedly mounted on the bottom of the cover plate (38) by screws, wherein the inner side of the surrounding plate (41) is provided with a second clamping edge (42) whose top surface abuts against the lower side balls (40).

5. The device for alleviating blockage of a vacuum system of a polyester production device according to claim 4, characterized in that: The movable connection device comprises a third clamping edge (43) arranged on both sides of the bottom of the handle (27), a sliding frame (44) slidably engaged with the third clamping edge (43) on both sides and movably mounted on the bottom of the handle (27), and the top end of the support (37) is hinged to the bottom surface of the sliding frame (44).

6. The device for alleviating blockage of a vacuum system of a polyester production device according to claim 5, characterized in that: A first annular groove (45) and a second annular groove (46) are respectively provided at the top edge of the first slide plate (29) and the bottom edge of the second slide plate (35), and a second spring (47) is provided in the first annular groove (45) and the second annular groove (46).

7. The device for alleviating blockage of a vacuum system of a polyester production device according to claim 6, characterized in that: The top of the first slide plate (29) is provided with a second blind hole (48) extending into the valve stem (26), and the bottom of the second slide plate (35) is provided with a guide column (49) which is at least partially inserted into the second blind hole (48) and slidably matched with the second blind hole (48).

8. The device for alleviating blockage of a vacuum system of a polyester production device according to claim 7, characterized in that: Two baffles (50) arranged opposite to each other are fixedly arranged on the top surface of the cover plate (38), and a limiting groove (51) is formed between the opposite side walls of the two baffles (50) for slidingly cooperating with the front end of the handle (27). Reinforcing ribs (52) connected to the top surface of the cover plate (38) are provided on the opposite sides of the two baffles (50).

9. A method for alleviating blockage of a vacuum system of a polyester production device according to claim 8, characterized in that: The following steps are involved: S1. Open the first ball valve (14) and the second ball valve (15), and inject a proper amount of hot ethylene glycol into the easily blocked section of the gas phase pipeline (11). The alcoholysis chemical principle of ethylene glycol is used to decompose the accumulated materials attached to the wall of the gas phase pipeline (11). In order to prevent the accumulated materials from alcoholysis from accumulating, an appropriate amount of hot ethylene glycol is injected intermittently for a short period of time to remove the accumulated materials after alcoholysis and clear the gas phase pipeline (11); S2, prepare three operators, operator No. 1 first inserts the solid dredging tube (19) into the dredging guide tube (16); S3. Operator No. 2 puts on asbestos gloves and uses a rag to block the inlet of the variable diameter dredging guide pipe (16) where the solid dredging pipe (19) is placed to prevent the system from breaking the vacuum during operation; S4, Operator No. 3 opens the common ball valve (17) and then the spare ball valve (18) in sequence; S5. After both the common ball valve (17) and the spare ball valve (18) are opened, operator No. 1 uses the solid dredging pipe (19) to dredge the outlet of the two-stage half jet pump and the inlet of the first-stage jet pump (2).

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