CN113102223B - Self-dredging type mining machinery vibrating screen - Google Patents
Self-dredging type mining machinery vibrating screen Download PDFInfo
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- CN113102223B CN113102223B CN202110286325.0A CN202110286325A CN113102223B CN 113102223 B CN113102223 B CN 113102223B CN 202110286325 A CN202110286325 A CN 202110286325A CN 113102223 B CN113102223 B CN 113102223B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
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Abstract
The invention discloses a self-dredging type mining machinery vibrating screen, which belongs to the technical field of mining machinery, and can change the shape of a variable diameter screen hole and fixedly insert a heat conducting core rod, wherein the upper half part of the heat conducting core rod generates heat through friction with vibrating ore and conducts the heat to a magnetic dredging ball below the heat conducting core rod through the lower half part, the stability of a magnetic field at a magnetic control middle end is kept by the heat, meanwhile, the lower half part of the heat conducting core rod can be deformed and avoided when the ore is screened out and dropped, once the blockage phenomenon occurs, the heat conduction is interrupted because the lower half part of the heat conducting core rod is extruded, the magnetic dredging ball is gradually cooled after losing the heat to force the deformation of the magnetic control middle end to converge the magnetic field, then a top block is dredged to be close to the blocked ore under the attraction of a weak magnetic ring in the variable diameter screen hole to dredge the variable diameter screen hole, thereby avoiding the long-term blockage phenomenon of the variable diameter screen hole, effectively improving the working efficiency and the service life of the vibrating screen.
Description
Technical Field
The invention relates to the technical field of mining machinery, in particular to a self-dredging type mining machinery vibrating screen.
Background
Mining machines are machines that are used directly for operations such as mineral mining and beneficiation. Including mining and beneficiation machinery. The working principle and structure of the prospecting machine are mostly the same as or similar to those of mining machines used for mining similar minerals, and the prospecting machine also belongs to mining machines in a broad sense. In addition, a large number of cranes, conveyors, ventilators, drainage machines, and the like are used in mining operations.
The ore dressing machine is a mining machinery vibrating screen which adopts advanced techniques at home and abroad such as vibrating motor excitation, rubber spring vibration reduction, high-wear-resistant material sieve plates, sealed sieve boxes and the like and an advanced self-synchronizing vibration principle, has the characteristics of long service life, low noise, high screening efficiency and the like, and is suitable for vibrating screening equipment for sintered ores, natural ores, cokes and other powdery materials.
Present shale shaker is at the in-process of screening ore, because the anomalous shape characteristic of ore, the phenomenon of jam sieve mesh appears easily at the in-process of screening, in case when comparatively serious jam phenomenon appears, the self vibration ability of relying on the shale shaker is difficult to realize independently dredging, can lead to the screening efficiency to reduce at the condition of not participating in external intervention, still cause the damage to the shale shaker simultaneously easily, consequently most of the circumstances, the shale shaker need often shut down the maintenance and guarantee good screening effect, can reduce the work efficiency and the life of shale shaker undoubtedly.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a self-dredging type mining machinery vibrating screen, which can change the shape of a reducing screen hole and fixedly penetrate through the reducing screen hole, wherein the upper half part of a thermal conduction core rod generates heat through friction with vibrating ore and transmits the heat to a magnetic dredging ball below the thermal conduction core rod through the lower half part, the magnetic field stability of a magnetic control middle end is kept by means of the heat, meanwhile, the lower half part of the thermal conduction core rod can be deformed and avoided when the ore is screened out and dropped, once the blockage phenomenon occurs, the lower half part of the thermal conduction core rod is extruded to interrupt heat transmission, the magnetic dredging ball is gradually cooled after losing the heat to force the magnetic control middle end to be deformed to converge a magnetic field, then a top block is dredged to be close to the blocked ore under the attraction of a weak magnetic ring in the reducing screen hole to dredge the long-term blockage phenomenon of the reducing screen hole, effectively improving the working efficiency and the service life of the vibrating screen.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A self-dredging type mining machinery vibrating screen comprises a vibrating seat, a built-in screen plate is arranged in the vibrating seat, a plurality of diameter-changing sieve pores which are uniformly distributed are arranged on the built-in sieve plate, a heat conducting core rod (3) is inserted in the diameter-changing sieve pores, the lower end of the heat conducting core rod is connected with a magnetic dredging ball, the magnetic dredging ball is connected with the bottom wall of the vibration seat, the opening of the reducing sieve pore is embedded and connected with a matched weak magnetic ring, the magnetic dredging ball comprises an isolation hemisphere, a strong magnetic hemisphere and a magnetic control middle end, the isolation hemisphere and the strong magnetic hemisphere are symmetrically distributed, the magnetic control middle end is connected between an isolation hemisphere and a strong magnetic hemisphere, the isolation hemisphere is connected with the heat conducting core rod, keep apart hemisphere outer end and set up a plurality of evenly distributed's holding tank, the holding tank intussuseption is filled with the mediation kicking block, be connected with between mediation kicking block and the holding tank diapire and pull the line.
Further, accuse magnetism middle-end includes thermal expansion piece and magnetic screen scale, the magnetic screen scale covers in the one end that strong magnetic hemisphere was kept away from to the thermal expansion piece, thermal conductance plug lower extreme is connected with many evenly distributed's heat conduction silk, and the heat conduction silk runs through the magnetic screen scale and extends to thermal expansion piece inner, and complete magnetic screen can be realized to strong magnetic hemisphere to the magnetic screen scale under the normal condition, then the mediation kicking block can receive the adsorption of weak magnetic ring and be used for dredging, thermal expansion piece inflation after receiving the heating of heat conduction silk, and the magnetic screen scale receives promotion then dispersion, no longer carries out complete magnetic screen to strong magnetic hemisphere, then adsorbs back mediation kicking block and does not block the ore.
Furthermore, the magnetic shielding scales comprise a plurality of magnetic shielding sheets which are distributed densely, and the heat conducting wires penetrate through gaps between the magnetic shielding sheets and extend to the inside of the thermal expansion block.
Furthermore, the thermal expansion block is made of a material which expands when heated, and the magnetic separation sheet is made of a material with high magnetic conductivity.
Further, the thermal conduction plug includes heat generation stick, interior heat conduction core and lower heat conduction stick, go up heat generation stick and lower heat conduction stick interconnect and distribute from top to bottom respectively, interior heat conduction core is inlayed in last heat generation stick, and interior heat conduction core one end extends to down the heat conduction stick inboard, goes up heat generation stick and the friction of ore and produces the heat, then through interior heat conduction core conduction to the heat conduction stick down, realizes the heating to accuse magnetism middle-end at last.
Further, go up the thermogenesis stick and adopt high coefficient of friction material to make, heat conduction rod adopts elastic material to make down, and heat conduction rod is the hollow structure that heat conduction fluid is filled for inside down, and heat conduction rod can carry out the deformation adaptation when receiving the ore extrusion down, and the ore that satisfies the particle diameter can normally fall, and the ore of jam then can cut off down the heat conduction route of heat conduction rod.
Furthermore, the heat-conducting fluid is a mixture of heat-conducting oil and heat-conducting sand in a mass ratio of 1:1, the particle size of the heat-conducting sand is not more than 0.1mm, the heat-conducting fluid has excellent heat conductivity, and meanwhile, the heat-conducting fluid can meet the requirement that the lower heat-conducting rod is deformed to a certain degree, and the interference on ore screening is almost avoided.
Furthermore, go up the connection face of themogenesis stick and heat conduction stick down and keep flushing with the up end of built-in sieve, guarantee can just in time extrude heat conduction stick down after the ore gets into the reducing sieve mesh to interrupt heat conduction.
Further, the mediation kicking block adopts flexible material to make hollow structure, and the mediation kicking block intussuseption is filled with the iron powder, and the mediation kicking block can strike not hard up the ore of jam when receiving the attraction of weak magnetic ring, and it can also carry out deformation and enter into the gap between ore and the reducing sieve mesh simultaneously to improve the not hard up effect to the ore under the attraction of mediation kicking block, thereby realize effectively dredging.
Further, the aperture of reducing sieve mesh is crescent from top to bottom, and the shortest distance between magnetism mediation ball and the built-in sieve is greater than the minimum aperture of reducing sieve mesh, and the ore is conveniently fallen down in the screening rear through the upper portion, is difficult for detaining in the reducing sieve mesh and leads to blockking up, and the whereabouts of ore can not disturbed in the position of magnetism mediation ball.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme can change the shape of the variable diameter sieve mesh and fixedly penetrate the variable diameter sieve mesh through the variable diameter sieve mesh, wherein the upper half part of the thermal conductive core rod generates heat through the friction between the thermal conductive core rod and the vibrating ore, and the heat is conducted to the magnetic dredging ball at the lower part through the lower half part, the stability of the magnetic field at the magnetic control middle end is kept through the heat, meanwhile, the lower half part of the thermal conductive core rod can be deformed and avoided when the ore is screened out of the falling material, once the blocking phenomenon occurs, because the lower half part of the thermal conductive core rod is extruded to interrupt heat conduction, the magnetic dredging ball is gradually cooled after losing heat to force the magnetic control middle end to deform to converge the magnetic field, then the top block is dredged to be close to the blocked ore under the attraction of the weak magnetic ring in the reducing sieve pore for dredging, thereby avoiding the long-term blocking phenomenon of the variable-diameter sieve pores, effectively improving the working efficiency of the vibrating sieve and prolonging the service life of the vibrating sieve.
(2) Accuse magnetism middle-end includes thermal expansion piece and magnetic screen scale, the magnetic screen scale covers in the one end that the strong magnetism hemisphere was kept away from to the thermal expansion piece, thermal conductance plug lower extreme is connected with many evenly distributed's heat conduction silk, and the heat conduction silk runs through the magnetic screen scale and extends to thermal expansion piece inner, the complete magnetic screen can be realized to strong magnetism hemisphere to the magnetic screen scale under the normal condition, then the mediation kicking block can receive the adsorption effect of weak magnetic ring and dredge, thermal expansion piece inflation after the heating that receives the heat conduction silk, the magnetic screen scale receives promotion then dispersion, no longer carry out complete magnetic screen to strong magnetism hemisphere, then adsorb back the mediation kicking block and do not block the ore.
(3) The thermal conduction plug includes heat generation stick, interior heat conduction core and heat conduction stick down, goes up heat generation stick and heat conduction stick interconnect down and distributes from top to bottom respectively, and interior heat conduction core is inlayed in last heat generation stick, and interior heat conduction core one end extends to heat conduction stick inboard down, goes up heat generation stick and the friction of ore and produces the heat, then through interior heat conduction core conduction to heat conduction stick down, realizes the heating to accuse magnetism middle-end at last.
(4) Go up the thermogenesis stick and adopt high coefficient of friction material to make, lower heat conduction stick adopts elastic material to make, and down the heat conduction stick for inside packing have heat-conducting fluid's hollow structure, lower heat conduction stick can carry out the deformation adaptation when receiving the ore extrusion, satisfies the ore of particle diameter and can normally fall, and the ore of jam then can cut off down the heat conduction route of heat conduction stick.
(5) The heat-conducting fluid is a mixture of heat-conducting oil and heat-conducting sand in a mass ratio of 1:1, the particle size of the heat-conducting sand is not more than 0.1mm, the heat-conducting fluid has excellent heat conductivity, and meanwhile, the heat-conducting fluid can meet the requirement that a lower heat-conducting rod is deformed to a certain degree and hardly interferes ore screening.
(6) Mediation kicking block adopts flexible material to make hollow structure, and the mediation kicking block intussuseption is filled with the iron powder, and the mediation kicking block can strike not hard up the ore of jam when receiving the attraction of weak magnetic ring, and it can also carry out deformation simultaneously and enter into the gap between ore and the reducing sieve mesh to improve the not hard up effect to the ore under the attraction of mediation kicking block, thereby realize effectively dredging.
(7) The aperture of reducing sieve mesh is crescent from last to down, and the shortest distance between magnetism dredge ball and the built-in sieve is greater than the minimum aperture of reducing sieve mesh, and the ore is just falling down at the screening rear through the upper portion, is difficult for being detained in the reducing sieve mesh and leads to blockking up, and the whereabouts of ore can not be disturbed in the position of magnetism dredge ball.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the built-in screen deck of the present invention;
FIG. 3 is a schematic view of the structure at A in FIG. 2;
FIG. 4 is a schematic structural view of a thermally conductive core rod of the present invention;
FIG. 5 is a schematic structural diagram of the magnetic dredging ball of the present invention.
The reference numbers in the figures illustrate:
the device comprises a vibration seat 1, a built-in sieve plate 2, a heat conducting core rod 3, an upper heat generating rod 31, an inner heat conducting core 32, a lower heat conducting rod 33, a magnetic dredging ball 4, an isolating hemisphere 41, a strong magnetic hemisphere 42, a thermal expansion block 43, a magnetic shielding scale 44, a diameter-variable sieve pore 5, a weak magnetic ring 6, a heat conducting wire 7, a dredging top block 8 and a traction pull wire 9.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1-3, a self-dredging type mining machinery vibrating screen comprises a vibrating seat 1, wherein an internal sieve plate 2 is installed in the vibrating seat 1, a plurality of diameter-changing sieve pores 5 which are uniformly distributed are formed in the internal sieve plate 2, a heat conducting core rod 3 is inserted into each diameter-changing sieve pore 5, the lower end of each heat conducting core rod 3 is connected with a magnetic dredging ball 4, the magnetic dredging ball 4 is connected with the bottom wall of the vibrating seat 1, and the openings of the diameter-changing sieve pores 5 are embedded and connected with weak magnetic rings 6 which are matched with each other.
The aperture of reducing sieve mesh 5 is from last to crescent down, and the shortest distance between magnetism dredge ball 4 and the built-in sieve 2 is greater than the minimum aperture of reducing sieve mesh 5, and the ore is just falling down in the screening rear through the upper portion, is difficult for being detained in reducing sieve mesh 5 and leads to blockking up, and the whereabouts of ore can not disturbed in the position of magnetism dredge ball 4.
Please refer to fig. 5, the magnetism control middle end includes thermal expansion block 43 and magnetic shielding scale 44, magnetic shielding scale 44 covers the one end that thermal expansion block 43 kept away from strong magnetic hemisphere 42, the 3 lower extreme of thermal conductance plug is connected with many evenly distributed's heat conduction silk 7, and heat conduction silk 7 runs through magnetic shielding scale 44 and extends to thermal expansion block 43 inner, magnetic shielding scale 44 can realize complete magnetic shielding to strong magnetic hemisphere 42 under the normal condition, then dredge kicking block 8 and can receive the adsorption of weak magnetic ring 6 and be used for dredging, thermal expansion block 43 expands after receiving the heating of heat conduction silk 7, magnetic shielding scale 44 receives promotion then dispersion, no longer carry out complete magnetic shielding to strong magnetic hemisphere 42, then adsorb back and dredge kicking block 8 and do not block the ore.
The magnetic shielding scales 44 include a plurality of magnetic shielding sheets densely distributed, and the heat conduction wires 7 extend to the inside of the thermal expansion block 43 through gaps between the magnetic shielding sheets.
The thermal expansion block 43 is made of thermal expansion material, and the magnetic isolation sheet is made of high magnetic conductivity material.
Referring to fig. 4, the thermal conductive core rod 3 includes an upper heat generating rod 31, an inner thermal conductive core 32 and a lower thermal conductive rod 33, the upper heat generating rod 31 and the lower thermal conductive rod 33 are connected to each other and distributed up and down, respectively, the inner thermal conductive core 32 is embedded in the upper heat generating rod 31, one end of the inner thermal conductive core 32 extends to the inner side of the lower thermal conductive rod 33, the upper heat generating rod 31 generates heat by friction with the ore, and then is conducted to the lower thermal conductive rod 33 through the inner thermal conductive core 32, and finally, the magnetic control middle end is heated.
Go up heat generation stick 31 and adopt high coefficient of friction material to make, lower heat conduction stick 33 adopts elastic material to make, and heat conduction stick 33 is the hollow structure that inside packing has heat-conducting fluid down, and heat conduction stick 33 can carry out the deformation adaptation when receiving the ore extrusion down, and the ore that satisfies the particle diameter can normally fall, and the ore of jam then can cut off down heat conduction path of heat conduction stick 33.
The heat-conducting fluid is a mixture of heat-conducting oil and heat-conducting sand in a mass ratio of 1:1, the particle size of the heat-conducting sand is not more than 0.1mm, the heat-conducting fluid has excellent heat conductivity, the lower heat-conducting rod 33 can deform to a certain degree, and interference to ore screening hardly exists.
The connection surface of the upper heat generating rod 31 and the lower heat conducting rod 33 is kept flush with the upper end surface of the built-in sieve plate 2, and the lower heat conducting rod 33 can be extruded right after the ore enters the reducing sieve holes 5, so that heat conduction is interrupted.
The invention can change the shape of the variable diameter sieve pore 5 and fix the heat conducting core rod 3 through the penetration, wherein the upper half of the core rod 3 generates heat by friction with the vibrating ore, and the heat is conducted to the magnetic dredging ball 4 at the lower part through the lower half part, the stability of the magnetic field at the magnetic control middle end is kept by the heat, meanwhile, the lower half part of the thermal conductive core rod 3 can be deformed and avoided when the ore is screened out of the falling material, once the blockage phenomenon occurs, because the lower half part of the thermal conductive core rod 3 is extruded to interrupt heat conduction, the magnetic dredging ball 4 is gradually cooled after losing heat to force the magnetic control middle end to deform to converge the magnetic field, then the top block 8 is dredged to be close to the blocked ore under the attraction of the weak magnetic ring 6 in the reducing sieve pore 5 for dredging, thereby avoiding the long-term blockage phenomenon of the variable diameter sieve pores 5, effectively improving the working efficiency of the vibrating sieve and prolonging the service life of the vibrating sieve.
The above are merely preferred embodiments of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (10)
1. The utility model provides a from mediation formula mining machinery shale shaker, includes vibration seat (1), install built-in sieve (2), its characterized in that in vibration seat (1): a plurality of uniformly distributed reducing sieve pores (5) are formed in the built-in sieve plate (2), a heat conduction core rod (3) is inserted into each reducing sieve pore (5), the lower end of each heat conduction core rod (3) is connected with a magnetic dredging ball (4), the magnetic dredging ball (4) is connected with the bottom wall of the vibration seat (1), the opening of each reducing sieve pore (5) is embedded and connected with a weak magnetic ring (6) matched with the opening of each reducing sieve pore, each magnetic dredging ball (4) comprises an isolation hemisphere (41), a strong magnetic hemisphere (42) and a magnetic control middle end, the isolation hemispheres (41) and the strong magnetic hemispheres (42) are symmetrically distributed, the magnetic control middle ends are connected between the isolation hemispheres (41) and the strong magnetic hemispheres (42), the isolation hemispheres (41) are connected with the heat conduction core rods (3), a plurality of uniformly distributed accommodating grooves are formed in the outer ends of the isolation hemispheres (41), and dredging top blocks (8) are filled in the accommodating grooves, and a traction pull wire (9) is connected between the dredging ejector block (8) and the bottom wall of the accommodating groove.
2. The self-dredging mining machinery vibrating screen of claim 1, wherein: accuse magnetism middle-end includes thermal expansion piece (43) and magnetic shielding scale (44), magnetic shielding scale (44) cover in thermal expansion piece (43) keep away from the one end of strong magnetism hemisphere (42), thermal conductance plug (3) lower extreme is connected with many evenly distributed's heat conduction silk (7), and heat conduction silk (7) run through magnetic shielding scale (44) and extend to thermal expansion piece (43) inner.
3. The self-dredging mining machinery vibrating screen of claim 2, wherein: the magnetic shielding scales (44) comprise a plurality of magnetic shielding sheets which are distributed densely, and the heat conducting wires (7) penetrate through gaps between the magnetic shielding sheets and extend to the interior of the thermal expansion block (43).
4. The self-dredging mining machinery vibrating screen of claim 3, wherein: the thermal expansion block (43) is made of a material which expands when heated, and the magnetic isolation sheet is made of a material with high magnetic conductivity.
5. The self-dredging mining machinery vibrating screen of claim 1, wherein: the heat conduction core rod (3) comprises an upper heat generation rod (31), an inner heat conduction core (32) and a lower heat conduction rod (33), the upper heat generation rod (31) and the lower heat conduction rod (33) are connected and distributed up and down respectively, the inner heat conduction core (32) is embedded in the upper heat generation rod (31), and one end of the inner heat conduction core (32) extends to the inner side of the lower heat conduction rod (33).
6. The self-dredging mining machinery vibrating screen of claim 5, wherein: the upper heat generating rod (31) is made of a high-friction-coefficient material, the lower heat conducting rod (33) is made of an elastic material, and the lower heat conducting rod (33) is of a hollow structure filled with heat conducting fluid.
7. The self-dredging mining machinery vibrating screen of claim 6, wherein: the heat-conducting fluid is a mixture of heat-conducting oil and heat-conducting sand in a mass ratio of 1:1, and the particle size of the heat-conducting sand is not more than 0.1 mm.
8. The self-dredging mining machinery vibrating screen of claim 5, wherein: the connecting surface of the upper heat generating rod (31) and the lower heat conducting rod (33) is kept flush with the upper end surface of the built-in sieve plate (2).
9. The self-dredging mining machinery vibrating screen of claim 1, wherein: the dredging top block (8) is made of a flexible material and is of a hollow structure, and iron powder is filled in the dredging top block (8).
10. The self-dredging mining machinery vibrating screen of claim 1, wherein: the aperture of the reducing sieve pore (5) is gradually increased from top to bottom, and the shortest distance between the magnetic dredging ball (4) and the built-in sieve plate (2) is larger than the smallest aperture of the reducing sieve pore (5).
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