CN112678358B - Wax scraping device above liquid level of storage tank - Google Patents
Wax scraping device above liquid level of storage tank Download PDFInfo
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- CN112678358B CN112678358B CN202011465316.XA CN202011465316A CN112678358B CN 112678358 B CN112678358 B CN 112678358B CN 202011465316 A CN202011465316 A CN 202011465316A CN 112678358 B CN112678358 B CN 112678358B
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- 238000007790 scraping Methods 0.000 title claims abstract description 58
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- 230000000149 penetrating effect Effects 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims description 28
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
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- 239000011152 fibreglass Substances 0.000 claims description 4
- 239000008397 galvanized steel Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
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Abstract
A wax scraping device above the liquid level of a storage tank comprises a scraper, a mounting frame, a supporting arm, a stress application mechanism and a mounting adapter; the scraper is connected to the mounting frame, the upper end of the supporting arm is connected to the mounting frame, the lower end of the supporting arm is connected to the stressing mechanism, and the stressing mechanism is connected to the floating disc through the mounting adapter; the shape of the scraper is matched with the arc shape of the inner wall of the storage tank; the mounting frame is of a special-shaped frame body structure, the middle part of the mounting frame is a vertical frame provided with bolt holes, a bolt rod of the bolt passes through the bolt holes and is a suspension end backwards after the bolt rod is fixed by nuts, the bottom end of the vertical frame is bent backwards and downwards, and bending points form guide supporting points; the support arm is a compensation arm with the upper end bent backwards, an adjusting long hole in the vertical direction is arranged on the compensation arm, a suspension end penetrating into a bolt rod in the adjusting long hole is movably connected, the stress application mechanism is of a spring plate structure, one end of the stress application mechanism is fixedly connected with the lower end of the support arm in a threaded manner, and the other end of the stress application mechanism is fixedly connected with the installation adapter in a threaded manner. The invention has long service life, wide compensation range, simple and reliable installation, high safety and better scraping effect with smaller pressure.
Description
Technical Field
The invention relates to a wax scraping device above a liquid level of a storage tank, and belongs to the technical field of wax scrapers of crude oil storage tanks or heavy oil storage tanks.
Background
In the existing crude oil storage tank or heavy oil storage tank, in order to prevent the condensation of storage tank wall wax, all install the tank on the storage tank and scrape wax device under the jar. The under-tank paraffin scraper has various forms, mainly comprises a heavy hammer paraffin scraper, a spring paraffin scraper and the like according to the principle of a stress mechanism, and with years of use, a part of the under-tank paraffin scraper has more problems found, the under-tank paraffin scraper gradually exits from the market, and the main stream product is the heavy hammer paraffin scraper at present. Along with the popularization of the novel shrapnel type sealing in China, a novel shrapnel type wax scraper is now provided. In the conventional various paraffin scraper devices, the mounting positions are all under the seal, some are arranged at the bottom of the floating disc, and some are arranged at the side surface of the floating cabin, but no matter which paraffin scraper device is below the liquid level, the height from the liquid level is generally 500-800mm, so that accumulated paraffin with a small liquid level is not removed in practice. And the closer to the liquid level, the smaller the action of the bottom heating coil, the lower the temperature of the oil product, the more serious the wax precipitation, and along with the operation of the storage tank, the more wax is accumulated at the highest liquid level position of the tank wall. When the storage tank emits oil, accumulated wax at the high-level part of the tank wall is leaked along with the descending of the floating disc, and at the moment, once the accumulated wax is melted due to the action of sunlight and the like, the accumulated wax flows to the upper part of the floating disc, so that the oil is wasted, and a great potential safety hazard is generated. The wax deposition and wall hanging of crude oil can generate various hazards:
(1) The wall-hanging wax-deposition material can rise along with the temperature, and the material hung on the tank wall flows to the tank floating roof along the tank wall and must be cleaned in time, otherwise, the material flows out through the central drain pipe, runs out through the rain water channel when raining, and causes great pollution and goods loss. Such as manual cleaning, a great deal of manpower and material resources are required.
(2) The wall-mounted wax-deposition substance forms crystals with different volumes on the wall of the storage tank, so that the smoother wall of the storage tank becomes uneven, the sealing adherence of the floating disc is affected, the sealing is not tight, and the volatilization of the VOCs in the annular space of the floating disc is increased.
(3) Oil hanging on the tank wall flows to the tank floating roof along the tank wall, which is equivalent to increasing the weight of the floating roof and influencing the safe operation of the floating roof.
For this reason, there is a need for a device for the tank that can remove residual wax above the tank level.
At present, no product capable of meeting the requirements exists at home and abroad, the pressure of secondary sealing is increased, residual wax is scraped by the secondary sealing, but in order to ensure tightness of the secondary sealing, sealing strips contacted with the tank wall are made of rubber materials, and residual wax cannot be removed when the weather is cold or in places with high wax hardness, and a large amount of residual wax flows onto the floating disc.
1. Potential safety hazard: because a large amount of wax deposition substances flow to the upper surface of the floating disc, the floating disc is corroded at first, so that the service life of the floating disc is reduced; secondly, because a large amount of combustible materials and combustible gases are arranged on the upper surface of the floating disc, once the fire is caused above the floating disc due to lightning stroke and the like, serious accidents are caused; thirdly, combustible materials such as crude oil can flow out through the central drain pipe and accumulate in the positions such as a sewer or a sewage pool, and once encountering a fire source, the combustible materials can cause larger safety accidents.
2. Environmental benefit: once the substances such as the storage medium and the like flow out, the water source can be polluted, a large amount of VOCs, toxic and harmful gases and the like can be generated, the environment is polluted, and the current environment protection requirement is not met.
3. Economic effect: the loss of the storage medium can cause direct economic loss, and a great deal of manpower and material resources are required to be input due to pollutant cleaning, air water source treatment and the like. Meanwhile, the service life of the storage tank is also reduced due to the aggravation of corrosion, so that huge economic loss is caused.
In order to remove residual wax, a storage tank wax scraping device above the liquid level is needed, and the wax scraping device is arranged between the primary seal and the secondary seal, so that the storage tank wax scraping device is small in size, simple in structure and convenient to install, and can effectively remove residual wax. The pressure of the wax scraper can be reduced due to the residual wax deposition of the scraping part. However, the wax scraping device is installed above the liquid level, so that the operation of the wax scraping device is required to be safe and reliable, and potential safety hazards to the operation of the floating disc are avoided. Therefore, a solution is needed.
Disclosure of Invention
The invention provides a wax scraping device above a liquid level of a storage tank, and aims to solve the technical problems that residual wax is scraped at the part above the liquid level of the storage tank and potential safety hazards are not caused to operation of a floating disc.
The invention is realized by the following technical scheme:
The wax scraping device comprises a scraper, a supporting arm, a stress application mechanism and a mounting adapter; the scraper is connected to the mounting frame, the upper end of the supporting arm is connected to the mounting frame, the lower end of the supporting arm is connected to the stress application mechanism, and the stress application mechanism is connected to the floating disc (A) through the mounting adapter;
The shape of the scraper is an arc shape matched with the arc shape of the inner wall (C) of the storage tank;
The mounting frame is of a special-shaped frame body structure, the cross section shape of the mounting frame is similar to a Chinese character 'ji', the top of the mounting frame is forwards suspended to form a scraper knife handle, the bottom of the scraper knife handle is fixedly connected with the scraper, the front edge of the scraper extends out of the edge of the top of the frame and is propped against the inner wall of the storage tank and is attached to the inner wall of the storage tank, the middle part of the mounting frame is a vertical frame which is vertically arranged, a bolt hole is formed in the middle part of the mounting frame, a bolt penetrates through the bolt hole and is fixed by a nut, the bolt rod of the bolt is backwards suspended, the lower part of the vertical frame is forwards inclined, the bottom is bent backwards and downwards, and a bending point forms a guide supporting point and is propped against the inner wall of the storage tank to support and guide;
The support arm is in a lath shape, the upper end of the support arm is backwards bent to form a compensation arm, the bending angle theta is 15-45 degrees, an adjusting long hole in the vertical direction is formed in the compensation arm, the adjusting long hole penetrates into the suspension end of the bolt rod to be movably connected, and the tail end of the suspension end is screwed and positioned by a retainer ring and a nut;
The stress application mechanism is of a spring plate structure, and one or more layers of elastic stainless steel plates are stacked together to form a spring plate shape with the middle part outwards bent; one end of the stress application mechanism is fixedly connected with the lower end of the supporting arm in a threaded manner, and the other end of the stress application mechanism is fixedly connected with the mounting adapter in a threaded manner.
Preferably, the wax scraping devices are arranged in a plurality along the circumferential direction of the inner wall of the storage tank, and adjacent scrapers 1 are arranged in a seamless mode in an overlapping mode from top to bottom to cover one circle of the tank wall.
Preferably, the scraper, the mounting frame and the supporting arm are all made of nonmetallic materials; the mounting adapter is made of galvanized steel sheets or stainless steel materials.
Preferably, the scraper is made of nylon or polytetrafluoroethylene materials, and the mounting frame and the supporting arm are made of glass fiber reinforced plastic or engineering plastic materials.
Preferably, the lengths of the mounting adapter and the supporting arm are adjusted so that the compensation range of the wax scraping device is not less than 400mm.
Preferably, the scraper is arranged for scraping wax unidirectionally, and the scraper is bent when the wax scraper moves upwards when the floating disc moves upwards and does not scrape wax.
Preferably, the wax scraping device is arranged between a common bag-type primary seal (D) and an L-shaped secondary seal (E) of the floating disc, and the installation adapter is arranged on the upper edge of the floating disc (A), namely the existing primary seal and secondary seal installation position (F).
Preferably, the wax scraping device is arranged at a shrapnel type primary sealing installation position (G) of the floating disc.
Preferably, the circumferential length of the scraper is not more than 1 meter, and two adjacent mounting frames are connected with the same scraper together; the supporting arms are divided into a long arm and a short arm, so that adjacent scrapers are arranged in a seamless mode in an overlapping mode from top to bottom; the scraper is in contact with the tank wall by adopting a straight vertical surface.
Preferably, the bending angle beta of the spring plate of the stressing mechanism is set within the range of 90-160 degrees; the lower end of the compensation arm is positioned above the bending point of the vertical frame.
The beneficial effects of the invention are that
1. Long service life: the stressing device in the wax scraping device adopts an elastic sheet structure, and the multilayer composite design of the stressing device ensures the uniformity of the elastic force, avoids the weakening of the elastic force caused by metal fatigue, greatly prolongs the service life of the wax scraping device, and simultaneously facilitates the adjustment of the elastic force due to the use of the multilayer elastic sheets.
2. The compensation range is wide: the wax scraping device adopts the design of the nonmetallic elastic supporting arm, so that the supporting arm plays a supporting role, plays a role of extending elastic force, enlarges the compensation range, and ensures that the compensation range can meet the current various edge seals. Meanwhile, the use of the nonmetal elastic arm reduces the use of metal devices in the secondary sealing space, so that the operation safety is ensured.
3. The installation is simple and reliable: the installation frame of the scraper is used for installing the scraper, connecting the supporting arm and the guiding device into a whole, the whole volume of the scraper is effectively reduced, the number of devices is reduced, the structure is simpler than a heavy hammer type structure, various rotating parts are canceled, the installation is easy, and the operation reliability of the paraffin scraper is ensured.
4. The safety is high: the wax scraper supporting arm, the scraper and the mounting frame are all made of nonmetal materials, so that the safety is further ensured.
5. A lower pressure gives a better scraping effect: in order to ensure the scraping effect, a certain pressure is applied to the scraper, the scraping effect is in direct proportion to the pressure of the root scraper acting on the wall of the storage tank within a certain range, and in a common heavy hammer type wax scraper, the scraping effect can be realized by adjusting the weight of the heavy hammer and the length of the supporting beam. However, in the present invention, since the size of the elastic member must be small due to the limitation of the installation space, in order to obtain a good effect, according to the pressure formula: p=f/S, the pressure can be increased by reducing the contact area with the tank wall, so in the invention, the scraper is in contact with the tank wall by adopting a vertical surface, namely, in contact with the vertical tank wall surface, so that the stress area is effectively reduced, and meanwhile, the overturning prevention function is realized by a specially designed mounting frame.
Drawings
Figure 1 is a schematic view of the general structure of the present invention between a conventional bladder-type primary seal and an L-type secondary seal mounted on a floating disc,
Figure 2 is a schematic view of the general structure of the spring-type primary seal mounting position of the floating disc of the present invention,
Figure 3 is a schematic side view of a support arm according to the present invention,
Figure 4 is a schematic diagram of the structure of the connection side of the scraper and the mounting frame of the invention,
Figure 5 is a schematic perspective view of the scraper structure of the invention,
Figure 6 is a schematic perspective view of the structure of the mounting frame of the invention,
Figure 7 is a schematic perspective view of the structure of the scraper which is commonly connected with two mounting frames,
Figure 8 is a schematic view of the downstream wax scraper of the present invention,
Figure 9 is a schematic view of the structure of the upward scraper of the invention which is bent and does not scrape wax,
Figure 10 is an enlarged schematic view of a portion of the upstream doctor blade structure of figure 9,
Figures 11 to 13 are schematic views of the operation condition structure of the present invention at different float clearances,
Figure 14 is a schematic structural view of a bladder-type sealed floating disc mounting floating disc limiting device,
Figure 15 is a schematic view of the upstream structure of the present invention,
Fig. 16 (1) (2) is a schematic diagram of the bending moment arm of the upward and downward scraper of the scraper,
FIG. 17 is a schematic view showing a structure in which a plurality of elastic stainless steel plates are stacked together,
FIG. 18 is a schematic view showing a structure in which a plurality of wax scraping devices are arranged in a circumferential direction of an inner wall of a tank according to the present invention;
description of the drawings:
Doctor blade 1, mounting frame 2, frame top 21, vertical frame 22, bolt hole 23, bolt 24, bolt rod 25, bending point 26, support arm 3, compensation arm 31, adjusting long hole 32, force applying mechanism 4, mounting adapter 5,
A floating disc A, (sealing) a bag B, an inner wall C of a storage tank, a primary sealing D, L type secondary sealing E, a secondary sealing installation position F, a shrapnel type primary sealing installation position G, a sealing shrapnel H, a bending moment arm of a liquid level K, L scraper, which is downward, and a bending moment arm of an L2 scraper, which is upward;
Detailed Description
Referring to fig. 1 and 2, the wax scraping device above the liquid level of the storage tank comprises a scraper 1, a mounting frame 2, a supporting arm 3, a force application mechanism 4 and a mounting adapter 5; the scraper 1 is connected to the mounting frame 2, the upper end of the supporting arm 3 is connected to the mounting frame, the lower end of the supporting arm is connected to the stressing mechanism 4, and the stressing mechanism is connected to the floating disc A through the mounting adapter 5;
referring to fig. 5, the scraper 1 is in an arc shape matched with the arc shape of the inner wall C of the storage tank so as to facilitate the adhesion of wax scraping;
Referring to fig. 4 and 6, the mounting frame 2 is a special-shaped frame body structure, the cross section shape of the mounting frame is approximately in a shape like a Chinese character 'ji', the frame top 21 of the mounting frame is forwards suspended to form a scraper knife handle, the bottom of the scraper knife handle is fixedly connected with the scraper 1 through bolts, the front end blade of the scraper extends out of the edge of the frame top 21 to be suspended and propped against the inner wall of the storage tank and is in arc fit with the inner wall of the storage tank, the middle part of the mounting frame is a vertical frame 22 which is vertically provided with a bolt hole 23, a bolt 24 passes through the bolt hole and is fixed through a nut, a bolt rod 25 of the bolt 24 is backwards provided with a suspension end, the lower part of the vertical frame is forwards inclined, the bottom end is backwards and downwards bent, and a bending point 26 forms a guide supporting point and props against the inner wall of the storage tank to support and guide;
Referring to fig. 3, the support arm 3 is in a shape of a lath, the upper end of the support arm is bent backwards to form a compensation arm 31, the bending angle θ is 15 ° -45 °, an adjusting long hole 32 in the vertical direction is arranged on the compensation arm, the adjusting long hole penetrates into the suspension end of the bolt rod 25 to be movably connected, the tail end of the suspension end is screwed and positioned by a retainer ring and a nut, the compensation arm can move up and down and back and forth at the suspension end of the bolt rod 25 to adjust the compensation amount, and the lower end of the compensation arm is positioned above the bending point 26 of the vertical frame 22;
The stressing mechanism 4 shown in FIG. 17 is of a shrapnel structure, and is formed by stacking one or more layers of elastic stainless steel plates together to form a shrapnel shape with the middle part outwards bent; one end of the stress application mechanism is fixedly connected with the lower end of the supporting arm in a threaded manner, and the other end of the stress application mechanism is fixedly connected with the mounting adapter in a threaded manner.
Referring to fig. 18, a plurality of wax scraping devices are arranged along the circumferential direction of the inner wall of the storage tank, and adjacent scrapers 1 are arranged in a seamless mode in an overlapping mode from top to bottom to cover one circle of the tank wall so as to scrape wax on the one circle of the tank wall at the same time.
The scraper, the mounting frame and the supporting arm are all made of nonmetallic materials; the mounting adapter is made of galvanized steel sheets or stainless steel materials.
Preferably, the scraper is made of nylon or polytetrafluoroethylene materials, and the mounting frame and the supporting arm are made of glass fiber reinforced plastic or engineering plastic materials.
Preferably, the length of the mounting adapter and the length of the supporting arm are adjusted so that the compensation range of the wax scraping device is not less than 400mm.
Preferably, the scraper is arranged for unidirectional scraping, as shown in fig. 9, 10, 15 and 16 (2), and the scraper is bent when the scraper moves upwards when the floating disc moves upwards and does not scrape wax.
Preferably, referring to fig. 1, the wax scraping device is installed between a normal bag type primary seal (D) and an L-shaped secondary seal (E) of the float plate, and the installation adapter 5 is installed on the upper edge of the float plate (a), that is, at the existing primary seal and secondary seal installation position (F).
Preferably, referring to fig. 2, the wax scraping device is installed at a shrapnel type primary seal installation position (G) of the floating disc.
Preferably, as shown in fig. 18 and 7, the circumferential length of the scraper is not more than 1 meter, and two adjacent mounting frames 2 are connected with the same scraper 1; the supporting arms are divided into a long arm and a short arm, so that adjacent scrapers are arranged in a seamless mode in an overlapping mode from top to bottom, wherein the upper scrapers use the long arm supporting arms, and the lower scrapers use the short arm supporting arms; the scraper is in vertical contact with the tank wall by adopting a vertical surface.
Preferably, as shown in fig. 11-13, the bending angle β of the spring plate of the force applying mechanism 4 is set in the range of 90 degrees to 160 degrees. The lower end of the compensating arm is located above the bending point 26 of the upright 22.
The technical characteristics of the wax scraping device above the liquid level of the storage tank are further described below:
The invention is mainly composed of the following structures: the scraper is matched with the original floating disc in a sealing way, so that fire is avoided;
a. Stress application mechanism
Considering that the wax scraper is arranged between the primary seal and the secondary seal, the size is small, so the stress application mechanism adopts a spring plate structure and is composed of single-layer or multi-layer elastic stainless steel plates. The principle is similar to that of a shock-absorbing bow plate structure of an automobile, and the shock-absorbing bow plate has the characteristics of simplicity, reliability, long service life and the like; meanwhile, the pressure can be changed by adjusting the number of the elastic sheets, so that the pressure is not too high or insufficient. The multi-layer spring structure is shown in fig. 17, and in the present invention, in order to ensure that the spring elasticity of the spring is not too low all the time, the bending angle β of the spring is set within the range of 90 degrees to 160 degrees, see fig. 11 and 13.
B. Support arm
The supporting arm transmits the elastic force generated by the elastic sheet to the scraper to play a role in transmitting force and supporting the scraper; because the wax scraper runs above the liquid level, for running safety, the support arm made of nonmetallic materials is considered, and the invention mainly adopts glass fiber reinforced plastic materials, which have the characteristics of high strength, long service life, corrosion resistance and the like, and are widely applied to various occasions.
Meanwhile, in order to ensure that the supporting arm can effectively transmit the elastic force to the scraper at each running position of the floating disc, the front end of the supporting arm can be bent by a certain angle theta according to the compensation range of the storage tank, and the angle theta is generally 15-45 degrees, so that the force can be better transmitted.
C. mounting adapter
In order to ensure the installation strength of the paraffin scraper, the installation adapter is made of galvanized steel plates or stainless steel materials and is installed at a primary sealing installation position.
According to the difference of the matched seals, the installation adapter is different, if the installation adapter is installed between the common bag type primary seal and the L-shaped secondary seal, the installation adapter is installed on the upper edge of the floating disc, namely the installation position of the existing primary seal and the secondary seal, and the installation position is shown in the figure 1; the mounting adapter is characterized in that an inclined section is arranged at the bottom of the plate body so as to be connected along the bending angle of the stress application mechanism, and the upper part of the mounting adapter is attached to the existing primary seal and secondary seal mounting position.
According to national standard GB50341, the compensating range of the floating disc seal is generally +/-100 mm, but in actual operation, a large number of storage tanks are found to be deformed, the actually required sealing compensating range far exceeds the value, the existing sealing compensating amount is insufficient, and a large amount of oil gas is leaked, so that the existing floating disc edge sealing devices are changed into spring piece type efficient sealing, and the compensating range is greatly enhanced as shown in figure 2.
The invention can also be arranged on a spring sheet type high-efficiency seal, and the installation position is a spring sheet type primary seal installation position, as shown in figure 2;
d. Scraper knife
In order to ensure that the scraper can effectively scrape residual wax on the wall of the storage tank and avoid potential safety hazards, the scraper is made of a nonmetal scraper material, and the scraper is required to have the characteristics of moderate hardness, low friction coefficient, oil resistance, corrosion resistance and the like. In view of this, in the present invention, it is considered to manufacture the doctor blade from nylon or polytetrafluoroethylene. In the invention, in order to ensure that the scraper is tightly jointed with the arc of the tank wall, each storage tank needs to design the scraper according to the diameter of the storage tank, and the arc of the scraper is identical to the arc of the storage tank, so that the joint of the scraper and the tank wall can be effectively ensured. As shown in fig. 5 and 7;
The mounting bracket of scraper also adopts glass steel or engineering plastic material, simultaneously, for simple to operate, the mounting bracket adopts special-shaped structure, also can play the direction function simultaneously at the installation scraper, prevents that the scraper from producing the upset when the operation. The scraper mounting frame is shown in fig. 4, 6 and 7;
For convenience in production, in the present invention, the length of the scraping blade is generally not more than 1m, a plurality of scraping blades are arranged along the tank wall, and for completely covering the tank wall, the supporting arm is divided into a long arm and a short arm, and a slight length difference exists, so that the scraping blades can be conveniently arranged in an overlapping manner, as shown in fig. 18. The length of the scraper is not more than 1 meter, and two adjacent mounting frames can be connected with the same scraper 1 together.
The mounting rack, the supporting arm, the stressing mechanism and the mounting adapter are all plate structures with proper widths, so that scraped operation and supporting are met.
The operation characteristics of the paraffin scraper are as follows:
1. Compensation range
According to national standard GB50341, the edge clearance of a common steel floating disc is 200mm, as shown in fig. 15, the compensation range of general sealing is +/-100 mm, and a floating disc limiting device is arranged below the floating disc, so that the minimum annular clearance of the floating disc is 100mm, as shown in fig. 14:
That is, the maximum edge clearance of the floating disc is 300mm according to national standard, but in order to consider that some floating discs have longer building time and larger deformation of the storage tank, the invention temporarily takes 350mm as the maximum clearance, and in actual use, the length of the mounting adapter and the length of the supporting arm are adjusted according to the requirement, so that the compensation range can be designed to be 400mm or even larger. Namely, the length of the mounting adapter and the length of the supporting arm are adjusted, and the compensation range of the wax scraping device is not less than 400mm.
In the present invention, if a larger compensation range is required, the support arm can be lengthened to ensure that the maximum value s=the support arm length l×cos θ (maximum inclination angle), and the maximum inclination angle is generally not more than 45 degrees, so that the compensation range can be enlarged by lengthening the support arm, and the installation position of the adapter needs to be reduced in order to prevent the wax scraper from interfering with secondary sealing.
2. The wax scraper at each position can effectively operate
In order to ensure the effective operation of the novel paraffin scraper above the liquid level, the paraffin scraper can be effectively attached to the wall of the storage tank when the maximum clearance, the minimum clearance and the normal position of the floating disc are ensured, and the phenomenon of overturning can not occur. Meanwhile, interference phenomenon with the existing seal does not occur at different positions.
As shown in fig. 11-13, the wax scraper of the present invention operates at different positions, and it can be seen that the wax scraper of the present invention can operate effectively in the full range of the floating disc gap by adjusting the position change between the long hole and the screw rod and the deformation of the spring plate of the force applying mechanism.
3. Unidirectional paraffin scraping setting
The invention aims to remove residual wax deposition of a wax scraper, and when a floating disc runs upwards, the wax deposition generated on a storage tank can enter the storage tank and is removed under the action of the original wax scraper and heating of the storage tank. In the upward direction, no wax removal is required. When the float plate is operated downward, as shown in fig. 8, the wax deposited on the liquid surface above the original wax scraper leaks out, and at this time, it is necessary to remove the wax.
In the present invention, the scraper is designed to be a non-metallic material for safety, and the scraper is designed to be reduced in resistance and reduced in friction when the float plate is up in order to increase the life of the scraper. In the present invention, the wax scraper bends when operating upwards, reducing the resistance to the tank wall. As shown in fig. 8 and 9; the scraper is one-way wax scraping device, when the floating disc is upwards, the scraper is designed to reduce resistance, friction is reduced, and when the wax scraper upwards runs, the wax scraper can bend to be seen in fig. 10.
In the present invention, the doctor blade is mounted on the doctor blade holder, and the mounting frame plays a role of reinforcing the rigidity of the doctor blade in addition to the function of mounting the doctor blade, but since the doctor blade is in single-sided contact with the mounting frame, the bending moment arm of the doctor blade is different when the doctor blade is in ascending and descending directions, and as can be seen from fig. 16 (1) (2), the bending moment arm L1 in descending directions is short, the bending moment arm L2 in ascending directions is long, and the bending amount=pressure=coefficient of friction ] of the doctor blade is bending moment arm, so that it is possible to obtain that the bending amount of the doctor blade in ascending directions is larger than that in descending directions. Thus, in the upward direction, the bending amount of the scraper is increased, and the included angle α between the scraper and the tank wall is decreased as shown in fig. 16 (2), and the upward/downward resistance of the scraper is decreased, in addition to the frictional force, by the force of the small obstacle on the tank wall, which is the force=obstacle resistance sin α, and all the resistance is also decreased when the included angle α between the scraper and the tank wall is decreased due to bending.
Matching performance of the paraffin scraper and the existing edge seal:
In the existing common floating roof edge seal, there are mainly three kinds of sealing of the bag type, mechanical seal and high-efficient shell fragment seal, wherein the mechanical seal is because the potential safety hazard is great, have already not recommended to use in China at present, the invention mainly uses sealing of the bag type and high-efficient shell fragment seal as the main adapting object, in these two kinds of seals, can install this and scrape the wax device effectively.
The installation schematic diagrams of the bag type seal and the high-efficiency elastic sheet seal are shown in figures 1 and 2;
the technical key points of the paraffin scraper of the invention
1. A liquid level paraffin scraper is additionally arranged between the primary seal and the secondary seal;
2. using nonmetallic materials, manufacturing scrapers, support arms and the like;
3. combining the mounting frame and the guiding function of the scraper;
4. The scraper is designed by adopting an arc-shaped curve of the storage tank, so that the scraper is tightly attached to the storage tank;
5. May be adapted to a variety of seal mounting forms.
Claims (10)
1. The wax scraping device comprises a scraper, a supporting arm, a stress application mechanism and a mounting adapter; the scraper is characterized in that the scraper (1) is connected to the mounting frame (2), the upper end of the supporting arm (3) is connected to the mounting frame, the lower end of the supporting arm is connected to the stressing mechanism (4), and the stressing mechanism is connected to the floating disc (A) through the mounting adapter (5);
the shape of the scraper (1) is an arc shape matched with the arc shape of the inner wall (C) of the storage tank;
The mounting frame (2) is of a special-shaped frame body structure, the cross section shape of the mounting frame is similar to a Chinese character 'ji', a frame top (21) of the mounting frame is forwards suspended to form a scraper knife handle, the bottom of the scraper knife handle is fixedly connected with the scraper (1), the front end blade of the scraper extends out of the edge of the frame top (21) and is propped against the inner wall of the storage tank and is attached to the inner wall of the storage tank, the middle part of the mounting frame is a vertical frame (22) which is vertically arranged, a bolt hole (23) is arranged on the vertical frame, a bolt rod (25) of the bolt (24) passes through the bolt hole and is backwards suspended after being fixed by a nut, the lower part of the vertical frame is forwards inclined, the bottom of the vertical frame is backwards and downwards bent, and a bending point (26) forms a guide supporting point and is propped against the inner wall of the storage tank to support and guide;
The support arm (3) is in a lath shape, the upper end of the support arm is backwards bent to form a compensation arm (31), the bending angle theta formed by the compensation arm and the support arm along a long line is 15-45 degrees, an adjusting long hole (32) in the vertical direction is formed in the compensation arm, the suspension end penetrating into the bolt rod (25) in the adjusting long hole is movably connected, and the tail end of the suspension end is screwed and positioned by a check ring and a nut;
The stress application mechanism (4) is of a spring plate structure, and one or more layers of elastic stainless steel plates are stacked together to form a spring plate shape with the middle part outwards bent; one end of the stress application mechanism is fixedly connected with the lower end of the supporting arm in a threaded manner, and the other end of the stress application mechanism is fixedly connected with the mounting adapter in a threaded manner.
2. A device for scraping wax above the liquid level of a storage tank as claimed in claim 1, wherein a plurality of the scraping wax devices are arranged along the circumferential direction of the inner wall of the storage tank, and adjacent scraping blades (1) are arranged in a seamless mode in an overlapping mode from top to bottom to cover the tank wall for a circle.
3. The device for scraping wax above the liquid level of a storage tank as claimed in claim 1, wherein the scraper, the mounting frame and the supporting arm are all made of nonmetallic materials; the mounting adapter is made of galvanized steel sheets or stainless steel materials.
4. A wax scraping device above the liquid level of a storage tank as claimed in claim 3, wherein the scraper is made of nylon or polytetrafluoroethylene materials, and the mounting frame and the supporting arm are made of glass fiber reinforced plastics or engineering plastic materials.
5. A tank level upper wax scraping device as in claim 1, wherein the mounting adapter and support arm length is adjusted such that the wax scraping device has a compensation range of not less than 400mm.
6. A device for scraping wax above a liquid level of a storage tank as claimed in claim 1, wherein the scraper is a unidirectional wax scraping device, and the scraper is curved when the wax scraping device is operated upwards when the floating disc is operated upwards without scraping wax.
7. A tank level upper wax scraping device as claimed in claim 1, characterized in that the wax scraping device is arranged between a normal bag-type primary seal (D) and an L-type secondary seal (E) of the float disc, and the mounting adapter (5) is arranged on the upper edge of the float disc (a), i.e. at the existing primary seal and secondary seal mounting position (F).
8. A tank level upper wax scraping device as claimed in claim 1, characterized in that the wax scraping device is mounted in a spring-type primary seal mounting position (G) of the float.
9. A device for scraping wax above the liquid level of a storage tank as claimed in claim 2, wherein the circumferential length of the scraper is not more than 1 meter, and two adjacent mounting frames (2) are connected with the same scraper (1); the supporting arms are divided into a long arm and a short arm, so that adjacent scrapers are arranged in a seamless mode in an overlapping mode from top to bottom; the scraper is in contact with the tank wall by adopting a straight vertical surface.
10. The wax scraping device above the liquid level of the storage tank as claimed in claim 1, wherein a bending angle beta formed by one end of the spring plate connecting support arm of the stressing mechanism (4) and an extension line of the installation adapter is set in a range of 90-160 degrees; the lower end of the compensation arm is positioned above a bending point (26) of the vertical frame (22).
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| CN202011465316.XA CN112678358B (en) | 2020-12-14 | 2020-12-14 | Wax scraping device above liquid level of storage tank |
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| CN202011465316.XA CN112678358B (en) | 2020-12-14 | 2020-12-14 | Wax scraping device above liquid level of storage tank |
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| CN112678358B true CN112678358B (en) | 2024-05-31 |
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