PDS control valve damping device used in UNIPOL process

Abstract

The utility model discloses a PDS control valve damping device used in the UNIPOL technology. The PDS control valve damping device comprises a PC storage tank, a PBT storage tank, an executing mechanism, a valve body, a support, a variable spring supporting and hanging frame and an inclined supporting plate. The support comprises an upper layer, a middle layer and a lower layer. The PC storage tank is arranged on the upper layer of the bracket; the PBT storage tank is arranged on the lower layer of the bracket; the PC storage tank is communicated with the PBT storage tank through a pipeline; the valve body is arranged on a pipeline for communicating the PC storage tank and the PBT storage tank; one end of the actuating mechanism is in driving connection with the valve body and is arranged in the bracket middle layer; the other end of the executing mechanism extends perpendicular to the valve body, and an inclined supporting plate is arranged at the extending end of the executing mechanism. And one end of the variable spring support hanger is hung on the upper-layer bottom plate of the bracket, and the other end is connected with the extension end of the actuating mechanism. According to the device, under the condition that normal vibration and operation of the executing mechanism are not affected, reliable supporting is provided for the executing mechanism, the over-limit motion condition is reduced, the gravity of the executing mechanism is offset, position deviation after long-time operation is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of polypropylene production, and in particular to a PDS control valve damping device used in a UNIPOL process. Background Art

[0002] The Unipol process technology is widely used in polypropylene production due to its high efficiency, environmental protection, high product quality and high degree of automation in the production process. The polypropylene product discharge system uses an intermittent method to transport homopolymers or random copolymers from the reactor to the product purification bin for storage.

[0003] The discharge control system used is PDS: Product Discharge System, in which the PDS control valve is a key device, mainly used to control the product discharge system of the polypropylene unit reactor to start and stop the discharge. The polypropylene product is discharged from the reactor C-4001 to the PC tank, then from the PC tank to the PBT tank, and finally transported to the product purification warehouse.

[0004] The PC tank is discharged to the PBT tank through a pipeline, and a PDS control valve is provided on the pipeline.

[0005] The PDS control valve is a pneumatic switch ball valve, which consists of a valve body, an actuator, and valve accessories (solenoid valve, valve position feedback switch, and air control valve). Figure 1 As shown, the largest valve D has a valve diameter of 12", a large valve body and an actuator, and the actuator is arranged on one side of the valve body. The actuator is installed horizontally relative to the valve body, and the drive shaft of the actuator is arranged parallel to the ground and is connected to the valve body drive.

[0006] Due to the above installation position, the following problems may occur during operation:

[0007] The PDS control valve has the characteristics of fast switching time and high frequency of operation. The switching process is accompanied by different degrees of vibration. Due to the gravity of the horizontally installed actuator, the connector and the valve stem are not on the same horizontal line during operation. This leads to faults such as valve position switch breakage, valve stem wear, and valve packing leakage. In severe cases, the valve stem will be locked and blocked, the valve cannot be switched, and the control fails. This seriously affects the stable operation of the device, and the failure rate is high, and the service life is shortened.

[0008] At the same time, there are also problems such as the valve position feedback switch rotating shaft being broken and the valve stuffing box and pressure cover being damaged.

[0009] The commonly used method in production at present is to frequently replace easily damaged parts such as valve position feedback switches and valve packing to avoid jamming, but the above problem has not been fundamentally solved.

[0010] The information disclosed in the background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in the field. Utility Model Content

[0011] In response to the above technical problems, the present application provides a PDS control valve damping device used in the UNIPOL process, which reduces the failure rate, extends the service life of the valve, and ensures the safe and stable operation of the device.

[0012] The present application provides a PDS control valve damping device used in the UNIPOL process, comprising: a PC tank, a PBT tank, an actuator, a valve body, a bracket, a variable spring support and hanger, and an inclined support plate; the bracket comprises: an upper layer, a middle layer, and a lower layer; the PC tank is arranged on the upper layer of the bracket; the PBT tank is arranged on the lower layer of the bracket; the PC tank and the PBT tank are connected by pipelines; the valve body is arranged on the pipeline connected by the PC tank and the PBT tank; one end of the actuator is connected to the valve body and is arranged in the middle layer of the bracket;

[0013] The other end of the actuator is extended vertically to the valve body, and an inclined support plate is arranged on the extended end of the actuator; one end of the variable spring support hanger is hung on the upper bottom plate of the bracket, and the other end is connected to the extended end of the actuator.

[0014] Preferably, a feedback switch is provided on the extended end of the actuator extending outward; one end of the oblique support plate is connected to the actuator, and the other end extends obliquely toward the feedback switch and is connected to the bottom of the feedback switch.

[0015] Preferably, the oblique support plates are symmetrically arranged on both sides of the feedback switch.

[0016] Preferably, it comprises: a steel wire rope; the steel wire rope is passed through the hanging plate and connected to the variable spring support hanger.

[0017] Preferably, the hanging plate comprises: a plate body, a through hole, and screw holes arranged in pairs; the through hole is opened at the upper part of the plate body; the screw holes are symmetrically arranged at the lower part of the plate body; the first bolt and the second bolt are passed through the screw holes and are detachably connected to the actuator.

[0018] Preferably, it comprises: a lower hopper; the lower hopper is arranged on the pipeline connecting the PC storage tank and the PBT storage tank, and is arranged above the valve body.

[0019] Preferably, the actuator is arranged to extend outwardly parallel to the ground.

[0020] The beneficial effects of this application include:

[0021] 1) The PDS control valve damping device used in the UNIPOL process provided in this application provides reliable support for the actuator without affecting the normal vibration and operation of the actuator, reduces the occurrence of over-limit movement, offsets the gravity of the actuator, reduces position deviation after long-term operation, and extends the service life.

[0022] 2) The PDS control valve damping device used in the UNIPOL process provided in the present application increases the firmness of the protruding end of the feedback switch and improves the stability of the bracket, thereby effectively solving the problem of feedback rod breakage by setting a triangular support frame on the protruding end of the feedback switch of the actuator.

[0023] 3) The PDS control valve damping device used in the UNIPOL process provided in the present application, by arranging a hanger on the end of the actuator away from the valve body, and the hanger is connected to the spring support hanger, which can not only ensure the vibration of the actuator during normal use, but also offset the deadweight of the actuator, thereby avoiding the deadweight acting on the valve position switch for a long time, causing the valve position switch to break or the valve stem to wear, and avoiding the position displacement of the valve position switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the installation status of the existing PDS control valve;

[0025] Figure 2 A schematic diagram of the installation state of a PDS control valve damping device used in the UNIPOL process in at least one embodiment provided in the present application;

[0026] Figure 3 A schematic diagram of a front view of a hanging board in at least one embodiment provided in the present application;

[0027] Figure 4 A schematic side view of the installation position in at least one embodiment provided in the present application;

[0028] Legend:

[0029] PC storage tank 1, bracket 11, lower hopper 12, valve body 2, actuator 3, PBT storage tank 4, feedback switch 31, variable spring support bracket 32, suspension rope 33, wire rope 331, hanging plate 35, inclined support plate 34, boss 311, through hole 351, first bolt 352, second bolt 353. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0032] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in the field, and can be implemented in a variety of common knowledge settings.

[0033] See also Figures 1 to 4 The PDS control valve damping device used in the UNIPOL process provided in the present application includes: a PC storage tank 1, a bracket 11, a lower hopper 12, a valve body 2, an actuator 3, a PBT storage tank 4, a feedback switch 31, a variable spring support bracket 32, a suspension rope 33, a wire rope 331, a hanging plate 35, an inclined support plate 34, a boss 311, a through hole 351, a first bolt 352, and a second bolt 353.

[0034] The PC storage tank 1 and the PBT storage tank 4 are connected by a pipeline, and a valve body 2 is arranged on the connecting pipeline; an actuator 3 is arranged on one side of the valve body 2; the actuator 3 is drivingly connected to the valve body 2 to control the opening and closing of the valve body 2. The specific connection method is the same as that of the existing complete set of equipment.

[0035] The PC tank 1 and the PBT tank 4 are installed at intervals on the top and bottom of the bracket 11. The PC tank 1 and the PBT tank 4 are relatively large in overall size. The connecting pipeline is arranged in the middle of the bracket 11. The valve body 2 and the actuator 3 are accommodated and arranged in the middle of the bracket 1. A feedback switch 31 is arranged on one side of the actuator 3; the feedback switch 31 is arranged to extend outwardly parallel to the ground.

[0036] One end of the inclined support plate 34 is connected to the outer wall of the actuator 3, and the other end is connected to the extended end of the feedback switch 31, and is obliquely supported between the actuator 3 and the feedback switch 31. The hanging plate 35 is arranged on the outer wall of the actuator 3 and is arranged toward the top surface of the bracket 11. The variable spring support bracket 32 ​​is hung on the middle top surface of the bracket 11 and is connected to the hanging plate 35 through a wire rope 331.

[0037] By setting the variable spring hanger 32, when the feedback switch 31 vibrates, it can move with the vibration. At the same time, the required spring force size can be calculated according to the total deadweight of the actuator 3.

[0038] Reasonable spring selection is performed, and spring hanger 32 is purchased and installed to offset the total deadweight of actuator 3, so as to avoid deformation, wear and jamming of feedback switch 31 under deadweight.

[0039] In a specific embodiment, it includes: a suspension rope 33; one end of the suspension rope 33 is welded to the top of the middle layer of the bracket 11, and the other end is connected to the variable spring support bracket 32.

[0040] In a specific embodiment, a lower hopper 12 is provided at the bottom of the PC storage tank 1, and the lower hopper 12 is connected to the feed inlet pipeline of the PBT storage tank 4. The lower hopper 12 can improve the uniformity of material discharge.

[0041] In a specific embodiment, a boss 311 is provided on the outer end surface of the actuator 3; a hanging plate 35 is provided on the boss 311; and one end of the inclined support plate 34 is welded to the boss 311. Using the existing structure of the actuator 3 for installation can avoid increasing the overall weight of the extension end and reduce the number of components.

[0042] In a specific embodiment, the hanging plate 35 includes: a plate body, a through hole 351, a first bolt 352, and a second bolt 353; the through hole 351 is provided at the upper part of the plate body; the steel wire rope 331 is passed through the through hole 351. Bolt holes are symmetrically provided at the lower part of the plate body; the first bolt 352 and the second bolt 353 which are detachably connected with the actuator 3 are installed in the bolt holes. A symmetrical and uniform lifting force is applied to the extension end of the actuator 3 to avoid excessively raising the extension end of the actuator 3.

[0043] The device effectively solves the problem of the breakage of the rotating shaft of the valve position feedback switch of the control valve; solves the wear of the actuator sleeve and seal, the wear and jam of the valve stem and sleeve; solves the problems of damage to the valve stuffing box and gland; reduces the wear of the valve core and valve seat, greatly reduces the failure rate, and prolongs the service life of the valve. Through technical transformation, the overall operating reliability of the PDS control valve is improved, ensuring the long-term stable operation of the PDS system of the polypropylene unit.

[0044] The device is suitable for an actuator 3 with a length greater than or equal to 620 mm and a width greater than or equal to 810 mm, and has a good supporting and protecting effect.

[0045] The above innovative transformation was carried out on the PDS control valve of the polymerization reaction system of the polypropylene unit of Yunnan Yuntian Petrochemical Co., Ltd.:

[0046] Before the transformation: PDS valves are prone to problems such as broken valve position feedback switch shaft, wear of actuator sleeve and seal, wear and blockage of valve stem and sleeve, damage to valve stuffing box and gland, etc. As a result, the valve loses its control function, has a high failure rate, seriously affects the stable operation of the device, and shortens the service life of the valve.

[0047] After the transformation: the problem of the rotating shaft of the valve position feedback switch of the control valve was solved; the wear of the actuator sleeve and seal, the wear and jam of the valve stem and sleeve were solved; the problems of damage to the valve stuffing box and gland were solved; the wear of the valve core and valve seat was reduced, the failure rate was greatly reduced, and the service life of the valve was extended. Through technical transformation, the overall operating reliability of the PDS control valve was improved, ensuring the long-term stable operation of the PDS system of the polypropylene unit.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PDS control valve damping device used in the UNIPOL process, characterized in that: include: A PC storage tank (1), a PBT storage tank (4), an actuator (3), a valve body (2), a bracket (11), a variable spring support bracket (32), and an inclined support plate (34); the bracket (11) comprises an upper layer, a middle layer, and a lower layer; the PC storage tank (1) is arranged on the upper layer of the bracket (11); the PBT storage tank (4) is arranged on the lower layer of the bracket (11); the PC storage tank (1) and the PBT storage tank (4) are connected by pipeline; the valve body (2) is arranged on the pipeline connected by the PC storage tank (1) and the PBT storage tank (4); one end of the actuator (3) is drivingly connected to the valve body (2) and is arranged on the middle layer of the bracket (11); The other end of the actuator (3) is extended perpendicularly to the valve body (2), and an inclined support plate (34) is provided on the extended end of the actuator (3); one end of the variable spring support bracket (32) is hung on the upper bottom plate of the bracket (11), and the other end is connected to the extended end of the actuator (3).

2. The PDS control valve damping device used in the UNIPOL process according to claim 1, characterized in that: A feedback switch (31) is provided on the extended end of the actuator (3) extending outward; one end of the oblique support plate (34) is connected to the actuator (3), and the other end extends obliquely toward the feedback switch (31) and is connected to the bottom of the feedback switch (31).

3. The PDS control valve damping device used in the UNIPOL process according to claim 2, characterized in that: The oblique support plates (34) are symmetrically arranged on both sides of the feedback switch (31).

4. The PDS control valve damping device used in the UNIPOL process according to claim 1, characterized in that: include: The steel wire rope (331) is passed through the hanging plate (35) and connected to the variable spring support bracket (32).

5. The PDS control valve damping device used in the UNIPOL process according to claim 1, characterized in that: The hanging plate (35) comprises: a plate body, a through hole (351), and screw holes arranged in pairs; the through hole (351) is opened at the upper part of the plate body; the screw holes are symmetrically arranged at the lower part of the plate body; the first bolt (352) and the second bolt (353) are inserted into the screw holes and are detachably connected to the actuator (3).

6. The PDS control valve damping device used in the UNIPOL process according to claim 1, characterized in that: include: The lower hopper (12) is arranged on the pipeline connecting the PC storage tank (1) and the PBT storage tank (4), and is arranged above the valve body (2).

7. The PDS control valve damping device used in the UNIPOL process according to claim 1, characterized in that: The actuator (3) is arranged to extend outwards parallel to the ground.

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