CN108489751B - Sampling device of honeycomb catalyst - Google Patents
Sampling device of honeycomb catalyst Download PDFInfo
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- CN108489751B CN108489751B CN201810313015.1A CN201810313015A CN108489751B CN 108489751 B CN108489751 B CN 108489751B CN 201810313015 A CN201810313015 A CN 201810313015A CN 108489751 B CN108489751 B CN 108489751B
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- side wall
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- 239000003054 catalyst Substances 0.000 title claims abstract description 66
- 238000005070 sampling Methods 0.000 title claims abstract description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 50
- 239000000178 monomer Substances 0.000 claims abstract description 27
- 230000009471 action Effects 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a sampling device of a honeycomb catalyst, which comprises a catalyst monomer, wherein the catalyst monomer is provided with an outer frame; comprising the following steps: the external pulling mechanism can act on the first side wall and the second side wall which are opposite to each other of the outer frame so as to take out the outer frame together with the catalyst monomer inside the outer frame; and the straight ejection mechanism can be abutted against the inner wall surfaces of the first side wall and the second side wall so as to prevent the first side wall and the second side wall from deforming inwards caused by the action of the external pulling mechanism. According to the sampling device for the honeycomb catalyst, the straight-top mechanism can be abutted against the inner wall surfaces of the first side wall and the second side wall acted by the external pulling mechanism so as to give reverse acting force to the first side wall and the second side wall, so that inward deformation of the first side wall and the second side wall and physical damage to a catalyst monomer caused by the inward deformation can be avoided to a large extent.
Description
Technical Field
The invention relates to the technical field of catalyst sampling, in particular to a sampling device for honeycomb catalyst monomers.
Background
Nitrogen oxides produced in industries such as electric power, heating power, metallurgy and the like can be removed through an SCR (Selective Catalytic Reduction, i.e., selective catalytic reduction) denitration process, and a catalyst adopted by the SCR denitration reactor is usually a honeycomb catalyst. During or at the end of the catalyst life cycle, it is necessary to verify the physicochemical properties, process properties of the catalyst as required and thereby evaluate whether the catalyst needs to be replaced. Taking a power plant as an example, a representative honeycomb catalyst monomer can be taken out from a catalyst frame in an SCR denitration reactor for detection during the intermittent operation of the power plant.
The honeycomb catalyst monomer is generally covered with an outer frame formed by encircling rectangular cylindrical stainless steel skins, and based on the outer frame, the conventional extraction method comprises the following steps: 1) Processing connecting holes on two opposite side walls of the outer frame; 2) Using a steel wire to pass through the two connecting holes, and then connecting two ends of the steel wire to form a closed steel wire; 3) And (5) penetrating the closed steel wire by using tools such as a crowbar and lifting the closed steel wire, so that the honeycomb catalyst monomer can be taken out. The method has the advantages of simple operation, no need of too many operation tools and the like, and is widely popularized and used in the prior art.
However, the stainless steel skin forming the outer frame is usually thinner, and when the honeycomb catalyst monomer is lifted upwards by adopting the scheme, the outer frame is easily twisted towards the center, so that physical damage is caused to the honeycomb catalyst monomer, and the subsequent detection is affected.
Therefore, how to provide a sampling device for a honeycomb catalyst, so as to avoid the distortion of the outer frame toward the center during the sampling process to a greater extent, and the physical damage to the honeycomb catalyst caused by the distortion, is still a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a sampling device of a honeycomb catalyst, which can prevent the outer frame from twisting towards the center to a large extent when sampling is carried out, and physical damage caused by the outer frame to the honeycomb catalyst monomer is avoided.
In order to solve the technical problems, the invention provides a sampling device of a honeycomb catalyst, wherein the honeycomb catalyst comprises a catalyst monomer, and the catalyst monomer is provided with an outer frame; comprising the following steps: the external pulling mechanism can act on the first side wall and the second side wall which are opposite to each other of the outer frame so as to take out the outer frame together with the catalyst monomer inside the outer frame; and the straight ejection mechanism can be abutted against the inner wall surfaces of the first side wall and the second side wall so as to prevent the first side wall and the second side wall from deforming inwards caused by the action of the external pulling mechanism.
According to the sampling device for the honeycomb catalyst, the straight-top mechanism can be abutted against the inner wall surfaces of the first side wall and the second side wall acted by the external pulling mechanism so as to give reverse acting force to the first side wall and the second side wall, so that inward deformation of the first side wall and the second side wall and physical damage to a catalyst monomer caused by the inward deformation can be avoided to a large extent.
Optionally, the external pulling mechanism comprises a clamp, and two clamping ends of the clamp respectively abut against the outer end surfaces of the first side wall and the second side wall.
Optionally, an inner end surface of the clamping end is provided with a slip-resistant structure.
Optionally, two operation ends of the clamp are respectively hinged with a pull rod, and the two pull rods are mutually hinged; and pull rings are further arranged at the hinged ends of the two pull rods, and external equipment can apply acting force to the external pull mechanism through the pull rings.
Optionally, the straight ejection mechanism comprises a driving piece, a screw rod, a wedge block and two ejection blocks, wherein one end of the screw rod is connected with the driving piece, and the other end of the screw rod is connected with the wedge block; the two opposite side walls of the wedge block are provided with guide surfaces which are gradually inclined inwards along the direction away from the driving piece, and the two top blocks are correspondingly arranged on the guide surfaces one by one and can slide along the guide surfaces; the driving piece can drive the screw rod to rotate, so as to drive the wedge block to displace along the axial direction of the screw rod, so that the two jacking blocks are forced to slide along the corresponding guide surfaces and gradually approach or gradually separate from each other along the direction vertical to the axial direction of the screw rod; in a gradually far-away state, the two top blocks can move to be respectively propped against the inner wall surfaces of the first side wall and the second side wall.
Optionally, the device further comprises a shell, wherein the wedge block and the two jacking blocks are both arranged in the shell, and the screw rod extends into the shell and is in threaded connection with the shell wall of the shell; the screw rod can be screwed in or out relative to the shell by rotating the screw rod, so that the wedge block is driven to axially displace.
Optionally, the lead screw can freely rotate relative to the wedge block, and one end of the lead screw, which is far away from the driving piece, is provided with a large-size part so as to axially clamp the lead screw to the wedge block.
Optionally, one of the guiding surface and the sliding matching surface of the top block and the guiding surface is provided with a sliding rail, and the other is provided with a sliding groove, and the sliding rail is clamped to the sliding groove and can slide along the sliding groove.
Optionally, the top block comprises a body and a top plate, the body is in an L shape, the L shape comprises a vertical part and a horizontal part, the vertical part is in sliding fit with the wedge block, and the top plate is arranged at one end of the horizontal part far away from the vertical part; the two opposite side walls of the shell are respectively provided with a guide cylinder extending outwards, the transverse part extends out of the shell from the guide cylinders and can slide in the guide cylinders, and the top plate is positioned outside the shell; when the top block extends outwards for a first set distance relative to the shell, the inner wall surface of the shell can prop against the vertical part to prevent the top block from continuously extending, and when the top block retracts inwards for a second set distance relative to the shell, the top plate can prop against the outer port of the guide cylinder to prevent the top block from continuously retracting.
Optionally, the driving piece comprises a driving disc and a plurality of driving arms arranged on the peripheral wall of the driving disc, the screw rod is fixedly connected with the driving disc, and the driving arms are operated to drive the screw rod to rotate; the device also comprises a limiting piece, wherein the limiting piece can be connected with the driving disc and the shell so as to limit the rotation of the driving disc.
Optionally, the device further comprises a shell, wherein the wedge block and the two jacking blocks are both arranged in the shell, the screw rod comprises a polish rod section and a thread section, the polish rod section penetrates through the shell and is fixed on the shell wall of the shell through a rolling bearing, and the wedge block is in threaded connection with the thread section; the inner wall of the shell can limit the rotation of the wedge block, and the rotation of the screw rod can drive the wedge block to axially displace.
Drawings
FIG. 1 is a schematic diagram of a sampling device for honeycomb catalyst according to an embodiment of the present invention;
FIG. 2 is a schematic view of the straight top mechanism in FIG. 1;
FIG. 3 is a schematic view of the straight top mechanism of FIG. 2 with the housing removed;
FIG. 4 is an exploded view of FIG. 3;
FIG. 5 is a schematic diagram of the use of the honeycomb catalyst sampling device according to the present invention.
The drawings in fig. 1-5 are shown as follows:
1a catalyst monomer;
2 outer frame;
3 an external pulling mechanism, 31a clamp, 311a clamping ends, 311a anti-slip structures, 312 operation ends, 32 pull rods and 33 pull rings;
4 straight ejection mechanism, 41 driving piece, 411 driving disk, 412 driving arm, 42 lead screw, 421 large-size part, 43 wedge block, 431 guide surface, 431a slide rail, 432 first groove body, 433 second groove body, 44 ejector block, 441 body, 442 top plate, 443 slide groove, 45 shell, 451 guide tube, 46 limiting piece.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The term "plurality" as used herein refers to a plurality, typically two or more, of indefinite quantities; and when "a number" is used to denote the number of a certain number of components, it does not denote the same number of components.
The terms "first," "second," and the like herein are merely used for convenience in describing two or more structures or components having the same or similar structure, and do not denote any particular limitation of the order.
Unless otherwise specified, the term "axial" as used herein refers to the axial direction of the screw, and for either component, the two walls that are "axially" opposite may be referred to as the upper wall (top wall), the lower wall (bottom wall), and the wall surrounding the "axial" may be referred to as the peripheral wall or side wall.
In addition, the descriptions of the directions or positional relationships of "inside", "outside", and the like described herein are based on the position of the screw, the direction approaching the screw being "inside", and the direction away from the screw being "outside", except for the inner wall surface, the outer wall surface, and the inside and outside descriptions of the housing; for any member, the end (end face, wall face) close to the screw is called an inner end (inner end face, inner wall face), and the end (end face, wall face) far from the screw is called an outer end (outer end face, outer wall face).
Referring to fig. 1-5, fig. 1 is a schematic structural diagram of a sampling device for a honeycomb catalyst according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a straight-top mechanism in fig. 1, fig. 3 is a schematic structural diagram of the straight-top mechanism in fig. 2 after a housing is removed, fig. 4 is an exploded view of fig. 3, and fig. 5 is a schematic operational diagram of the sampling device for a honeycomb catalyst according to the present invention.
As shown in fig. 1, the invention provides a sampling device for a honeycomb catalyst, the honeycomb catalyst comprises a catalyst monomer 1, the catalyst monomer 1 is arranged in a rectangular cylindrical outer frame 2, and the sampling device comprises an external pulling mechanism 3 and a straight top mechanism 4. It should be noted that in the SCR denitration process adopted in industries such as electric power, the honeycomb catalyst is usually a module group formed by a plurality of catalyst monomers 1, and the sampling device provided by the present invention mainly samples a certain catalyst monomer 1 in the module group.
During the sampling operation, the pull-out mechanism 3 can act on the first side wall and the second side wall opposite to the outer frame 2 to take out the outer frame 2 together with the catalyst monomer 1 inside. In the above process, the straight-top mechanism 4 can abut against the inner wall surfaces of the first side wall and the second side wall, so as to give the first side wall and the second side wall opposite acting forces, and further can largely block the inward deformation of the first side wall and the second side wall caused by the action of the external pulling mechanism 3, and thus the physical damage to the catalyst unit 1 is caused.
In a specific embodiment, the pull-out mechanism 3 may include a clamp 31, where the clamp 31 may be formed by hinging two clamp arms, and as shown in fig. 1, the hinging point may be disposed approximately in the middle of the two clamp arms to form an X-like shape. The clamp 31 has two clamping ends 311 and two operating ends 312, and applies an inward force to the two operating ends 312, so that the two clamping ends 311 can move inward to respectively abut against the outer end surfaces of the first side wall and the second side wall, and then apply an axial pulling force to the operating ends 312, so that the catalyst unit 1 can be taken out.
To ensure effective transmission of the tensile force, the inner end surface of the clamping end 311 may be provided with a slip-preventing structure 311a to increase friction between the clamping end 311 and the outer wall surface of the outer frame 2. The anti-slip structure 311a may be directly formed on the inner end surface of the clamping end 311, and may be a serrated tooth pattern or a plurality of protrusions; alternatively, the slip prevention structure 311a may be a separate member, for example, a slip prevention piece having a large friction force, and the separate slip prevention structure 311a may be attached to the inner end surface of the clamp end 311 by adhesion, welding, or the like.
Further, the clamping end 311 may have a larger width, so as to ensure a sufficient contact area with the outer wall surface of the outer frame 2, so as to increase the friction force to a greater extent; meanwhile, the force can be dispersed, so that the excessive extrusion force generated by the clamping end 311 on a certain point on the wall surface of the outer frame 2 can be avoided. In the embodiment of the present invention, the width of the clamping end 311 may be 1/3-2/3 of the width of the sidewall on which it acts. With reference to fig. 1 or 5, the width refers to the dimension of the corresponding member in the direction perpendicular to the plane of the paper.
The external pulling mechanism 3 may further include two pulling rods 32, one ends of the two pulling rods 32 may be hinged to two operation ends 312 of the clamp 31, and the other ends of the two pulling rods 32 may be hinged to each other, so that the two pulling rods 32 and the clamp 31 may form a four-bar structure, and the clamping ends 311 of the clamp 31 may be easily actuated by operating the hinged ends of the two pulling rods 32. Both the operating ends 312 of the clamp 31 and both ends of the pull rod 32 may be flat, so as to facilitate the connection of the corresponding hinge ends by the hinge shaft.
The hinged ends of the two tie rods 32 may also be provided with a pull ring 33, through which pull ring 33 an external device may apply a force to the external pulling mechanism 3 to pull out the outer frame 2. The embodiment of the invention is not limited to the type of the external device, and a person skilled in the art can select a corresponding device according to needs during specific operation, for example, the external device can be a lifting device such as a crowbar, a manual hoist, an electric hoist, etc.
With reference to fig. 1 as a view, when an external device applies an upward force to the pull ring 33, the hinged ends of the two pull rods 32 can move upward and drive the hinged parts of the two pull rods 32 and the operation end 312 to retract inward, so as to drive the two clamping ends 311 of the clamp 31 to clamp the opposite side walls of the outer frame 2. At this time, if the upward force continues to be applied, the pressure generated by the clamping end 311 to the outer frame 2 may be converted into a static friction force to take out the outer frame 2 together with the catalyst sample 1 therein.
It should be noted that the above description of the specific structure of the pull-out mechanism 3 is only one specific scheme of the embodiment of the present invention, and is not intended to limit the scope of the sampling device provided by the present invention, and in the specific implementation, a person skilled in the art may select an appropriate pull-out mechanism 3 according to actual needs.
In fact, due to the existence of the straight top mechanism 4, the pull-out mechanism 3 may be any pull-out device in the prior art, and no matter what form of pull-out device is adopted, the opposite side walls of the outer frame 2 are not easy to twist towards the center. For example, the external pulling mechanism 3 may be a steel wire common in the prior art, two ends of the steel wire may be respectively connected to two opposite side walls of the outer frame 2, when a tensile force is applied to the steel wire, the steel wire may generate an inward twisting force at a connection and an abutting position of the steel wire and the outer frame 2, and the straight pushing mechanism 4 may abut against an inner wall surface of a position of the outer frame 2 subjected to the inward twisting force, so as to effectively avoid twisting of the outer frame 2 toward the center.
The following examples of the present invention will also describe the structure of the straight-top mechanism 4 in the sampling device for the honeycomb catalyst according to the above embodiments.
As shown in fig. 2-4, the straight ejection mechanism 4 may include a driving element 41, a screw rod 42, a wedge 43 and two ejector blocks 44, one end of the screw rod 42 is connected with the driving element 41, the other end is connected with the wedge 43, and the driving element 41 can drive the screw rod 42 to rotate, so as to drive the wedge 43 to displace along the axial direction. The opposite side walls of the wedge 43 may have guide surfaces 431 inclined gradually inward in a direction away from the driver 41 (reflected in the drawing, i.e., from top to bottom), that is, the wedge 43 forms a tapered portion gradually shrinking, and the two top blocks 44 may be mounted on the corresponding guide surfaces 431 in a one-to-one correspondence manner and may slide along the guide surfaces 431.
With this structure, when the wedge 43 is displaced downward in the axial direction, the tapered portion may be continuously inserted between the two top blocks 44 to force the two top blocks 44 to move back to back in the direction perpendicular to the axial direction of the screw rod 42, and gradually move away from each other until the two top blocks 44 can abut against the inner wall surfaces of the opposite side walls of the outer frame 2, so as to adapt to the outer frame 2 having different sizes of the catalyst monomers 1; when the wedge 43 is displaced upward in the axial direction, the two top blocks 44 can gradually approach each other in the direction perpendicular to the axial direction, so as to release the contact state with the inner wall surface of the outer frame 2.
In the first embodiment, as shown in fig. 2 and combined with fig. 3 and 4, the straight ejection mechanism 4 may further include a housing 45, where the wedge 43 and the two ejector blocks 44 may be installed in the housing 45, and the screw rod 42 may extend into the housing 45 and be screwed with a wall (top wall in the drawing) of the housing 45, so as to ensure reliability of the screwed connection, to avoid slipping to a greater extent, the wall provided with the threaded hole (or only the wall provided with the threaded hole) may be thickened. When the screw rod 42 rotates, the screw rod can be screwed in or out relative to the housing 45, and the wedge 43 is driven to axially displace.
Specifically, the wedge 43 may be provided with a first groove 432 in the axial direction, and the screw 42 may be inserted into the first groove 432 and may freely rotate in the first groove 432. The wedge 43 may further be provided with a second groove 433 in a vertical axial direction, the second groove 433 is communicated with the first groove 432, one end of the screw rod 42 inserted into the wedge 43 may be provided with a large-sized portion 421, and the large-sized portion 421 may be axially clamped in the second groove 433, so that the wedge 43 and the screw rod 42 may be axially displaced synchronously.
The large-size portion 421 may be a circular or other disc, or may be a plurality of protruding blocks protruding radially from the outer wall of the screw 42, so long as the large-size portion 421 and the second groove 433 can be axially clamped, so as to avoid the screw 42 from being directly separated from the wedge 43 in the axial direction.
In the second embodiment, a housing 45 may be provided, and the wedge 43 and the two top blocks 44 may be mounted in the housing 45. Unlike the first embodiment, in this embodiment, the screw 42 may include a polish rod section and a thread section, and the polish rod section may pass through the housing 45 and be fixed to a wall of the housing 45 by a rolling bearing, that is, the screw 42 is fixed to the housing 45 in an axial direction and is capable of freely rotating with respect to the housing 45; the wedge 43 may be provided with a threaded hole, or may be provided with a nut by press-fitting, welding, or the like to be engaged with the threaded section of the screw 42, and a limiting plate may be provided on the inner wall surface of the housing 45, or may be adjusted in size by the housing 45 to limit rotation of the wedge 43.
When the driving piece 41 drives the screw rod 42 to rotate, the position of the screw rod 42 relative to the shell 45 is unchanged, and through threaded fit, the wedge block 43 can convert the rotary motion of the screw rod 42 into linear motion so as to axially displace relative to the screw rod 42, and further drive the corresponding top block 44 to act.
Both embodiments described above enable axial displacement of the wedge 43, which can be selected by a person skilled in the art according to the actual needs of the implementation. In contrast, in the first embodiment, the screw rod 42 can be screwed in or out relative to the housing 45, so that an operator can conveniently and intuitively know the movement form of the current wedge 43; in the second embodiment, the connection structure between the screw 42 and the wedge 43 is relatively simple.
One of the guide surface 431 of the wedge 43 and the sliding mating surface of the top block 44 and the guide surface 431 may be provided with a slide rail 431a, and the other may be provided with a slide groove 443, and the slide rail 431a may be engaged with the slide groove 443 and may slide along the slide groove 443. In particular, in the embodiment of the present invention, the sliding rail 431a may be installed on the guiding surface 431, and the sliding groove 443 may be disposed on the sliding mating surface of the top block 44; of course, the slide rail 431a may be provided on the sliding surface of the top block 44, and the slide groove 443 may be provided on the guide surface 431 instead.
Here, the embodiment of the present invention is not limited to the specific shapes of the slide rail 431a and the slide groove 443, and those skilled in the art can set the shape according to the actual needs in practical applications. For example, the cross-sectional shape of the slide rail 431a may be T-shaped, L-shaped, dovetail-shaped, cross-shaped, or the like, and the slide groove 443 may be a matching T-shaped groove, L-shaped groove, dovetail groove, cross-shaped groove, or the like. Regardless of the shape, the slide rail 431a may be ensured to slide along the slide groove 443, and the slide rail 431a may not be separated from the slide groove 443 in the non-sliding direction.
As shown in fig. 3, and referring to fig. 4, the top block 44 may include a main body 441, one end of the main body 441 may be provided with the sliding groove 443 to slidably engage with the wedge 43, and the other end may abut against the inner wall surface of the outer frame 2. Moreover, the contact portion between the top block 44 and the inner wall surface of the outer frame 2 can at least cover the contact portion between the clamping end 311 and the outer wall surface of the outer frame 2, that is, the contact portion between the top block 44 and the clamping end 311 can be in contact with the inner wall surface and the outer wall surface of the outer frame 2, and the contact area between the top block 44 and the inner wall surface of the outer frame 2 can be at least larger than the contact area between the clamping end 311 and the outer wall surface of the outer frame 2, so as to effectively prevent the side wall of the outer frame 2 from twisting towards the center.
That is, the contact end between the top block 44 and the outer frame 2 needs to have a large size, and for this purpose, a top plate 442 may be provided at the other end of the top block 44, and the top plate may be brought into contact with the inner wall surface of the outer frame 2 through the top plate 442. With this structure, the use requirement can be satisfied by only increasing the size of the top plate 442 without increasing the size of the top block 44 as a whole, which can greatly reduce the manufacturing cost of the top block 44 and reduce the weight of the whole straight top mechanism 4 for convenient use.
Further, the body 441 may have an L shape, and for convenience of description, a portion of the L shape axially aligned with the screw 42 may be referred to as a vertical portion, and a portion perpendicular to the screw 42 may be referred to as a horizontal portion, and as shown in fig. 3, the vertical portion may be slidably engaged with the wedge 43, and the top plate 442 may be mounted on the horizontal portion.
The opposite side walls of the housing 45 may be provided with outwardly extending guide barrels 451, in which case the housing 45 is generally "convex". The lateral portion of the top block 44 may protrude from the guide tube 451, and the top plate 442 may be located outside the housing 45 and may abut against an outer port of the guide tube 451. Thus, when the top blocks 44 extend outwards (i.e. the two top blocks 44 gradually get away from each other) by a first set distance, the inner wall of the housing 45 may abut against the vertical portion to block the top blocks 44 from extending continuously; when the top blocks 44 are retracted inwardly (i.e., the top blocks 44 are gradually moved closer together) a second set distance, the top plate 442 may abut against the outer port of the guide cylinder 451 to block continued retraction of the top blocks 44. In other words, the L-shaped body 441 and the top plate 442 can be engaged with the housing 45 to limit displacement of the top block 44. Specific values of the first set distance and the second set distance are not limited, and may be set according to actual needs.
With continued reference to fig. 3, in the embodiment of the present invention, the lateral dimension of the wedge 43 is smaller, and there is no lateral displacement of the wedge 43 during sampling, so the lateral dimension of the housing 45 for covering the wedge 43 may also be smaller. Based on this, the upper end portion of the above-described "convex" shaped housing may be downsized to form a housing like "earth" as shown in fig. 2 to minimize the consumable parts of the housing 45. The lateral direction refers to a direction perpendicular to the axial direction of the screw 42.
In fact, when the wedge 43 is displaced up and down, the inner wall surfaces of the top wall and the bottom wall of the housing 45 limit the stroke of the wedge 43, and the limit of the up and down stroke of the wedge 43 is also the limit of the stroke of the top block 44.
The driving piece 41 may include a driving disc 411 and a plurality of driving arms 412 disposed on a peripheral wall of the driving disc 411, each driving arm 412 may be distributed at intervals along a circumferential direction, the screw rod 42 may be fixedly connected with the driving disc 411, and the driving arms 412 may be operated to drive the screw rod 42 to rotate. It will be appreciated that the drive 41 may take other forms, such as a circular hand wheel or the like.
The straight ejection mechanism 4 may further include a limiting member 46, where the limiting member 46 can be connected with the driving disc 411 and the housing 45 to limit the rotation of the driving disc 411, so as to prevent the retraction of the ejector block 44 caused by external factors, and thus the situation that the ejector block 44 cannot be effectively abutted against the outer frame 2. Here, the embodiment of the present invention is not limited to the shape of the limiting member 46, and may be specifically set according to actual needs; in the embodiment of fig. 2, the limiting member 46 may be an L-shaped rod (pin), a vertical rod of the L-shaped rod may pass through the driving disc 411 and be inserted into the housing 45, and a cross rod of the L-shaped rod may overlap an upper surface of the driving disc 411.
It should be noted that the above description of the specific structure of the straight ejection mechanism 4 is a preferred scheme of the embodiment of the present invention, and is not intended to limit the implementation range of the sampling device provided by the present invention, and other structures of the straight ejection mechanism 4 may be adopted on the premise of satisfying the function; for example, the straight-pushing mechanism 4 may be a telescopic rod, and both ends of the telescopic rod may abut against inner end surfaces of both opposite side walls of the outer frame 2.
As shown in fig. 5, and taking a coal-fired power plant as an example, during a shutdown interval, a worker can enter the SCR denitration reactor through a manhole door or the like to judge the service condition of the honeycomb catalyst, select a catalyst monomer 1 as a test sample, and sample the catalyst by using the sampling device provided by the invention, wherein the specific sampling steps can be referred to as follows:
the driving disc 411 is rotated by the driving arm 412, so that the two top blocks 44 of the straight top mechanism 4 extend outwards until being abutted against the inner wall surfaces of the two opposite side walls of the outer frame 2;
the limiting piece 46 is connected with the driving disc 411 and the shell 45 so as to limit the rotation of the driving disc 411 relative to the shell 45 and prevent the two top blocks 44 from retracting;
using the pull-up mechanism 3, and operating the pull ring 33 so that the two clamping ends 311 of the clamp 31 are abutted against the outer wall surfaces of the two opposite side walls of the outer frame 2, and ensuring that the abutting positions of the clamping ends 311 and the outer wall surfaces of the side walls and the abutting positions of the jacking blocks 44 and the inner wall surfaces of the side walls are opposite;
pulling force is applied to the pull ring 33 by a corresponding external device to take out the catalyst unit 1 of which the outer frame 2 communicates with the inside thereof.
Analysis shows that the sampling device provided by the invention has the advantages of simple structure, convenience in operation and portability, can be suitable for in-situ sampling of the catalyst monomer 1 in the SCR denitration reactor, and has stronger applicability and application range.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (7)
1. A sampling device for a honeycomb catalyst, the honeycomb catalyst comprising a catalyst monomer (1), the catalyst monomer (1) being provided with an outer frame (2), characterized by comprising:
a pull-out mechanism (3), wherein the pull-out mechanism (3) can act on a first side wall and a second side wall which are opposite to each other of the outer frame (2) so as to take out the outer frame (2) together with the catalyst monomer (1) inside the outer frame;
the straight ejection mechanism (4) can be abutted against the inner wall surfaces of the first side wall and the second side wall so as to prevent the first side wall and the second side wall from deforming inwards caused by the action of the external pulling mechanism (3);
the external pulling mechanism (3) comprises a clamp (31), and two clamping ends (311) of the clamp (31) respectively abut against the outer end surfaces of the first side wall and the second side wall;
the straight ejection mechanism (4) comprises a driving piece (41), a screw rod (42), a wedge block (43) and two ejection blocks (44), one end of the screw rod (42) is connected with the driving piece (41), and the other end of the screw rod is connected with the wedge block (43); the two opposite side walls of the wedge block (43) are provided with guide surfaces (431) which are gradually inclined inwards along the direction away from the driving piece (41), and the two top blocks (44) are correspondingly arranged on the guide surfaces (431) one by one and can slide along the guide surfaces (431); the driving piece (41) can drive the screw rod (42) to rotate, so as to drive the wedge block (43) to displace along the axial direction of the screw rod (42), so that the two top blocks (44) are forced to slide along the corresponding guide surfaces (431) and gradually approach or gradually separate from each other along the direction perpendicular to the axial direction of the screw rod (42); in a gradually distant state, the two top blocks (44) can move to respectively prop against the inner wall surfaces of the first side wall and the second side wall;
the device further comprises a shell (45), wherein the wedge block (43) and the two jacking blocks (44) are arranged in the shell (45), and the screw rod (42) extends into the shell (45) and is in threaded connection with the shell wall of the shell (45); the screw rod (42) can be screwed in or out relative to the shell (45) by rotating, so that the wedge block (43) is driven to axially displace;
the screw rod (42) can freely rotate relative to the wedge block (43), and one end of the screw rod (42) far away from the driving piece (41) is provided with a large-size part (421) so as to clamp the screw rod (42) to the wedge block (43) along the axial direction;
the top block (44) comprises a body (441) and a top plate (442), the body (441) is L-shaped, the L-shaped body comprises a vertical portion and a transverse portion, the vertical portion is in sliding fit with the wedge block (43), and the top plate (442) is mounted at one end, far away from the vertical portion, of the transverse portion.
2. The sampling device for honeycomb catalysts according to claim 1, characterized in that the inner end surface of the clamping end (311) is provided with a slip-preventing structure (311 a).
3. The sampling device for honeycomb catalysts according to claim 1, characterized in that the two operating ends (312) of the clamp (31) are respectively hinged with tie rods (32), and the two tie rods (32) are mutually hinged;
the hinged ends of the two pull rods (32) are also provided with pull rings (33), and external equipment can apply acting force to the external pulling mechanism (3) through the pull rings (33).
4. A device for sampling a honeycomb catalyst according to any one of claims 1-3, wherein one of the guide surface (431) and the sliding mating surface of the top block (44) and the guide surface (431) is provided with a slide rail (431 a), and the other is provided with a slide groove (443), and the slide rail (431 a) is engaged with the slide groove (443) and is capable of sliding along the slide groove (443).
5. A device for sampling a honeycomb catalyst according to any one of claims 1 to 3, wherein the opposite side walls of the housing (45) are provided with outwardly extending guide cylinders (451), the cross section extends out of the housing (45) from the guide cylinders (451) and is slidable within the guide cylinders (451), and the top plate (442) is located outside the housing (45);
when the top block (44) stretches out a first set distance outwards relative to the shell (45), the inner wall surface of the shell (45) can prop against the vertical part to prevent the top block (44) from continuously stretching out, when the top block (44) stretches back inwards relative to the shell (45) for a second set distance, the top plate (442) can prop against the outer port of the guide cylinder (451) to prevent the top block (44) from continuously retracting.
6. A device for sampling a honeycomb catalyst according to any one of claims 1-3, wherein the driving member (41) comprises a driving disc (411) and a plurality of driving arms (412) arranged on the peripheral wall of the driving disc (411), the screw (42) is fixedly connected with the driving disc (411), and the driving arms (412) are operated to drive the screw (42) to rotate;
the device further comprises a limiting piece (46), wherein the limiting piece (46) can be connected with the driving disc (411) and the shell (45) so as to limit the rotation of the driving disc (411).
7. A device for sampling a honeycomb catalyst according to any one of claims 1-3, characterized in that the screw (42) comprises a polish rod section and a threaded section, the polish rod section passing through the housing (45) and being fixed to the wall of the housing (45) by means of rolling bearings, the wedge (43) being screwed with the threaded section;
the inner wall of the shell (45) can limit the rotation of the wedge block (43), and the rotation of the screw rod (42) can drive the wedge block (43) to axially displace.
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| CN201810313015.1A CN108489751B (en) | 2018-04-09 | 2018-04-09 | Sampling device of honeycomb catalyst |
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| CN201810313015.1A CN108489751B (en) | 2018-04-09 | 2018-04-09 | Sampling device of honeycomb catalyst |
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| CN108489751B true CN108489751B (en) | 2024-04-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110508342B (en) * | 2019-08-31 | 2021-07-23 | 贵州大学 | Medicine taking device for chemistry experiments |
| CN110617986B (en) * | 2019-09-17 | 2021-10-29 | 华电电力科学研究院有限公司 | Sampling test method of SCR (Selective catalytic reduction) honeycomb catalyst |
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