CN111875234A - Heating device for molten glass - Google Patents

Abstract

The invention provides a heating device for molten glass, which comprises a platinum channel and a flange sleeved on the outer wall surface of the platinum channel and electrically contacted with the platinum channel, wherein the flange comprises an inner ring and an outer ring circumferentially connected with the inner ring, the radial thickness of a first arc of the platinum channel is smaller than that of a second arc, the axial thickness of a first arc section of the inner ring is smaller than that of a second arc section, the outer ring is eccentrically arranged upwards relative to the platinum channel in the vertical direction, so that more current flows through the bottom of the platinum channel to generate more heat, after the molten glass at the bottom of the platinum channel is intensively heated, an upward molten glass flow is generated, and after reaching the top of the platinum channel, the molten glass flow respectively flows leftwards, downwards, rightwards and downwards, the function of static stirring is realized, and the temperature and the uniformity of components of the glass are improved, thereby leading the glass liquid to achieve the effect of homogenizing and soaking.

Description

Heating device for molten glass

technical field

The invention relates to the field of glass manufacturing, in particular to a heating device for molten glass.

Background technique

Compared with ordinary soda-lime-silica glass, borosilicate glass has greatly improved mechanical properties, thermal stability, water resistance, alkali resistance, acid resistance, etc. Therefore, it is widely used in aerospace, military, chemical, It has good application value and social benefits in many industries such as medicine, fire protection, and home appliances.

Among them, in the production process of neutral medicinal borosilicate glass, the molten glass is conveyed to the forming device through a platinum channel including various process sections. To ensure that the molten glass operates under the temperature profile required by the process, each section of the platinum channel can heat the molten glass within the platinum channel by applying an electrical current in these sections, directly or indirectly, to heat the molten glass within the platinum channel. The process section includes but is not limited to clarification section, stirring section and cooling section.

However, the glass liquid in the platinum channel is not uniform in composition in the up-down direction due to the influence of gravity. At the same time, in the existing molten glass heating device, the current is easier to flow through the upper wall of the platinum channel, and the current flowing through the upper wall of the platinum channel is larger than the current flowing through the lower wall of the platinum channel. Other conditions are the same. The heat generated by the upper wall of the platinum channel is greater than the heat generated by the lower wall of the platinum channel. In this way, the heating of the molten glass in the vertical direction is not uniform, which further leads to the non-uniform composition of the molten glass in the vertical direction.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a heating device for molten glass, which aims to make the glass liquid in the platinum channel achieve the effect of uniform temperature and homogeneity.

To achieve the above object, the present invention proposes a heating device for molten glass, with a line of symmetry along the vertical direction, comprising:

The platinum channel, the wall thickness of which varies in the circumferential direction; the radial section of the platinum channel includes a first circular arc located above and a second circular arc located below, the first circular arc and the second circular arc enclosing A radial section of the platinum channel is formed, the radial thickness of the second circular arc is greater than the radial thickness of the first circular arc, and both the first circular arc and the second circular arc are along the symmetry line Symmetrical setup;

A flange is sleeved on the outer wall surface of the platinum channel and is in electrical contact with the platinum channel, the flange includes an inner ring and an outer ring peripherally connected to the inner ring; the inner ring includes a first ring located above an arc segment and a second arc segment located below, the first arc segment and the second arc segment enclose the inner ring, and the first arc segment and the second arc segment are symmetrical along the symmetry line The axial thickness of the first arc segment is smaller than the axial thickness of the second arc segment; the inner ring is arranged concentrically with the platinum channel, and the outer ring is vertically opposite to the platinum channel Channel up eccentric setting.

Optionally, the radial cross-sectional area of the second arc is 30% to 60% of the radial cross-sectional area of the platinum channel.

Optionally, the axial thickness of the second arc segment is 1.2 to 3 times the axial thickness of the first arc segment.

Optionally, the upward offset of the center of the outer ring relative to the center of the platinum channel is 10% to 60% of the diameter of the platinum channel.

Optionally, the outer ring is provided with choke holes, the choke holes are symmetrically arranged along the symmetry line, and the choke holes are located above the inner ring.

Optionally, the shape of the choke hole in the radial section is a long strip, a meniscus or a dovetail.

Optionally, the heating device for molten glass further includes a cooling pipe, the cooling pipe is arranged around the outer ring, and a cooling medium passes through the cooling pipe.

Optionally, the heating device for molten glass further includes a plurality of reinforcing members, and the plurality of reinforcing members are arranged on the inner sidewall surface of the top of the platinum channel at intervals along the length direction of the platinum channel.

Optionally, the shape of the radial section of the platinum channel is a circle, a rectangle, a triangle, a trapezoid, a parallelogram, an ellipse or a racetrack shape.

Optionally, the material of the inner ring is platinum-series precious metal or platinum-series precious metal alloy; the material of the outer ring is nickel with a purity of at least 99wt%.

Through the special design of the present invention, more current is passed through the bottom of the platinum channel to generate more heat. After the glass liquid at the bottom of the platinum channel is strongly heated, an upward glass liquid flow is generated. After the glass liquid flow reaches the top of the platinum channel Flowing to the left, down, right, and down, respectively, realizes the function of "static stirring", and the uniformity of the temperature and composition of the glass liquid is improved, so that the glass liquid can achieve the effect of homogeneous heating.

Description of drawings

In order to illustrate the technical solutions in the embodiments or exemplary embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments or exemplary descriptions. Obviously, the drawings in the following description are only the For some embodiments of the invention, for those of ordinary skill in the art, other drawings can also be obtained from those shown in these drawings without any creative effort.

1 is a schematic front view of a heating device for molten glass when the radial cross section of the platinum channel according to the embodiment of the present invention is circular;

Fig. 2 is the cross-sectional structure schematic diagram along the axial direction of Fig. 1;

3 to 5 are schematic diagrams of three embodiments of the second arc when the radial cross section of the platinum channel of the present invention is circular;

6 is a schematic front view of a heating device for molten glass when the radial section of the platinum channel according to the embodiment of the present invention is a racetrack shape;

7 to 9 are schematic diagrams of three embodiments of the second arc when the radial section of the platinum channel of the present invention is a racetrack shape;

FIG. 10 is a schematic diagram of the installation of a platinum channel stiffener according to an embodiment of the present invention;

11 is a schematic diagram of the connection between two adjacent electric heating flanges and a power supply member according to an embodiment of the present invention.

Description of reference numbers:

10 Platinum Channel 211 first arc 11 first arc 212 second arc 12 second arc twenty two outer ring 121 first wall section twenty three choke hole 122 second wall section twenty four electrode 123 third wall section 30 cooling pipe 20 flange 40 reinforcement twenty one inner ring 50 power supply

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions 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. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

As used herein, the term "radial section" refers to the section formed when a platinum channel is cut by a plane perpendicular to the longitudinal axis of the platinum channel, unless otherwise specified.

The present invention provides a heating device for molten glass.

In one embodiment, as shown in FIGS. 1 to 5 , the heating device for molten glass includes a platinum channel 10 and a flange 20 , wherein the heating device has a symmetry line Y along the vertical direction, and the platinum channel The wall thickness of the platinum channel 10 changes in the circumferential direction, and the flange 20 is sleeved on the outer wall surface of the platinum channel 10 and is in electrical contact with the platinum channel 10 . An alternating current is connected to the flange 20, which conducts current to the platinum channel 10, which acts as an electrical heating load for electrical heating. The flange 20 includes an inner ring 21 and an outer ring 22 surrounding the inner ring 21 , and the inner ring 21 is in electrical contact with the outer wall of the platinum channel 10 . The outer ring 22 plays the role of distributing the current, and the inner ring 21 plays the role of introducing the current into the platinum channel 10 .

Wherein, the radial section of the platinum channel 10 includes a first arc 11 located above and a second arc 12 located below, and the first arc 11 and the second arc 12 enclose the platinum channel 10, the radial thickness of the second arc 12 is greater than the radial thickness of the first arc 11, and both the first arc 11 and the second arc 12 are along the line of symmetry Y is arranged symmetrically; the inner ring 21 includes a first arc segment 211 located above and a second arc segment 212 located below, and the first arc segment 211 and the second arc segment 212 are enclosed to form the inner ring 21 , the first arc segment 211 and the second arc segment 212 are symmetrically arranged along the symmetry line Y; the axial thickness of the first arc segment 211 is smaller than the axial thickness of the second arc segment 212; therefore The inner ring 21 is arranged concentrically with the platinum channel 10 , and the outer ring 22 is eccentrically arranged upward relative to the inner ring 21 in the vertical direction.

According to the calculation formula of conductor resistance:

R=ρ×L/S;

Among them, ρ is the resistivity of the conductor, L is the length of the conductor, and S is the cross-sectional area of the conductor.

The radial thickness of the second circular arc 12 is greater than the radial thickness of the first circular arc 11 , that is, the conductive cross-sectional area of the second circular arc 12 is larger than the conductive cross-sectional area of the first circular arc 11 . According to the calculation formula of conductor resistance, under other conditions being the same, the resistance of the second arc 12 is made smaller than the resistance of the first arc 11 , that is, the second arc 12 is thicker than the resistance of the first arc 11 . The first arc 11 has a smaller resistance. And because the first arc 11 and the second arc 12 are arranged in parallel, if a certain voltage is applied, according to Ohm's law, under the premise of a certain voltage, the smaller the resistance, the larger the current. The current flowing through the second arc 12 is greater than the current flowing through the first arc 11 . According to W=UI, under a certain voltage, the electric heating power generated by the second arc 12 is greater than the electric heating power generated by the first arc 11 , that is, the electric heating at the bottom of the platinum channel 10 The power is greater than the electric heating power at the top of the platinum channel 10 .

Similarly, the axial thickness W1 of the first arc segment 211 is smaller than the axial thickness W2 of the second arc segment 212 , that is, the conductive cross-sectional area of the first arc segment 211 is larger than that of the second arc segment 212 . Conductive cross-sectional area is small. According to the calculation formula of conductor resistance, under other conditions being the same, the resistance of the first arc segment 211 is greater than the resistance of the second arc segment 212 . Since the first arc segment 211 and the second arc segment 212 are arranged in parallel, if a certain voltage is applied, according to Ohm's law, under the premise of a certain voltage, the smaller the resistance, the greater the current. The current of the second arc segment 212 is greater than the current flowing through the first arc segment 211 , and the second arc segment 212 is in electrical contact with the second arc 12 , and the second arc segment 212 Introducing a larger current into the second arc 12 further increases the electrical heating power at the bottom of the platinum channel 10 .

Because the outer ring 22 is eccentrically disposed upward relative to the platinum channel 10 in the vertical direction. The radial width H1 of the upper portion of the outer ring 22 is greater than the radial width H2 of the lower portion of the outer ring 22 . The upper part of the outer ring 22 has the same resistivity ρ and conductive cross-sectional area S as the lower part of the outer ring 22. According to the conductor resistance calculation formula, since the radial width H1 of the upper part of the outer ring 22 is greater than The radial width H2 of the lower part of the outer ring 22 causes the length L of the current-carrying conductors in the upper part of the outer ring 22 to be larger, so the upper part of the outer ring 22 has a larger resistance R. According to Ohm's theorem, the upper part of the outer ring 22 has a larger resistance R. Under the same voltage U, a smaller current is passed into the top of the platinum channel 10, and a larger current is passed into the platinum channel The bottom of the channel 10 further increases the electric heating power at the bottom of the platinum channel 10 .

Through the special design of the present invention, more current passes through the bottom of the platinum channel 10 to generate more heat. After the glass liquid at the bottom of the platinum channel 10 is heated strongly, an upward glass liquid flow is generated. After the flow reaches the top of the platinum channel 10, it flows to the left, down, right, and down respectively (as shown in Figure 5, where the arrows in the illustration indicate the flow direction of the glass liquid), realizing "static stirring" The function of the glass liquid is improved, and the uniformity of the temperature and composition of the glass liquid is improved, so that the glass liquid can achieve the effect of homogeneous heating.

At the same time, the present invention greatly improves the uniformity of the temperature and composition of the glass liquid flowing in the platinum channel 10 on the premise of ensuring the life of the platinum channel 10 . For the platinum channel 10 in the clarification section, the present invention effectively increases the temperature of the molten glass at the position near the center of the bottom of the clarification section, and at the same time accelerates the speed at which the gaseous substances contained in the molten glass are floated and discharged from the molten glass. , which greatly improves the clarification effect of the clarification section on the inner glass liquid. The temperature difference between the temperature of the molten glass at the center of the outlet of the platinum channel 10 and the temperature of the molten glass at the liquid surface of the outlet of the platinum channel 10 is less than or equal to 5°C.

The so-called "static stirring" refers to the movement of the fluid inside the platinum channel 10 without the action of moving parts. Different from the traditional stirring that relies on moving parts, the reason for "static stirring" is that there is uneven temperature and inhomogeneity in the fluid, resulting in differences in the density of the fluid, and the fluid between different densities is heated to generate convection.

In an embodiment of the present invention, the radial cross-sectional area of the second arc 12 is 30% to 60% of the radial cross-sectional area of the platinum channel 10 , so that the second arc 12 provides enough heat. When the ratio of the radial cross-sectional area of the second arc 12 is too small, the thickness of the second arc 12 is not obvious, and the increase of the current of the second arc 12 is not obvious enough; When the radial cross-sectional area of the arc 12 is too large, eg, more than 60% of the radial cross-sectional area of the platinum channel 10 , the cost will be increased.

The specific form of the second arc 12 is not limited, as long as the radial thickness of the second arc 12 is greater than the radial thickness of the first arc 11, and the second arc 12 is The lines of symmetry are arranged symmetrically.

Specifically, in an embodiment of the present invention, the second arc 12 can be uniformly thickened, as shown in FIGS. 3 , 4 and 7 , the manufacturing process of uniform thickening is simple. In other embodiments, the second arc may be unevenly thickened. As shown in FIGS. 5 and 8 , the second arc 12 includes a continuous first wall portion 121 and a second wall portion 122, the first wall portion 121 is located at the center of the second arc 12, the The second wall portion 122 includes two, the two second wall portions 122 are located on both sides of the first wall portion 121 respectively, and the radial thickness of the first wall portion 121 is larger than that of the second wall portion The radial thickness of the second wall portion 122 is greater than the radial thickness of the first arc 11 .

As an optional embodiment, as shown in FIG. 9 , the second arc 12 further includes a third wall portion 123 , and the third wall portion 123 is provided between the first wall portion 121 and the second wall portion 123 . between the wall portions 122, and the radial thickness of the third wall portion 123 is smaller than the radial thickness of the first wall portion 121, and the radial thickness of the third wall portion 123 is greater than that of the second wall portion 122 radial thickness. That is, the third wall portion 123 is a transition section between the first wall portion 121 and the second wall portion 122, and its radial thickness is between the radial thickness of the first wall portion 121 and the first wall portion 121. Between the radial thicknesses of the two wall portions 122, to avoid direct reduction from the thicker first wall portion 121 to the thinner second wall portion 122, to prevent the temperature of the second arc 12 from increasing to the two side drop.

In an embodiment of the present invention, as shown in FIGS. 1-5 , the shape of the radial section of the platinum channel is a circle; in another embodiment of the present invention, the shape of the radial section of the platinum channel is It is a racetrack shape, as shown in Figure 6-9, the racetrack shape is formed by splicing two parallel straight lines and two semicircles. The circular and racetrack shapes facilitate the flow of glass liquid due to the continuous arc of the side walls. In other embodiments, the radial cross-sectional shape of the platinum channel may also be other shapes, such as a rectangle, a triangle, a trapezoid, a parallelogram, or an ellipse, which is not limited herein.

Optionally, the material of the inner ring 21 is a platinum-series precious metal (such as pure platinum) or a platinum-series precious metal alloy (such as platinum-rhodium 10wt% or platinum-rhodium 20wt%); the outer ring 22 is at least 99wt% pure. nickel. Of course, in other embodiments, the inner ring 21 and the outer ring 22 may also be made of other materials, which are not limited herein.

In an embodiment of the present invention, as shown in FIG. 2 , the axial thickness W2 of the second arc segment 212 is 1.2 to 3 times the axial thickness W1 of the first arc segment 211 , so that the The second arc segment 212 can draw a sufficiently large current and then lead into the second arc 12 , that is, the bottom of the platinum channel 10 . When the axial thickness W2 of the second arc segment 212 is less than 1.2 times the axial thickness W1 of the first arc segment 211 , the bottom of the platinum channel 10 (ie the second arc 12 ) may not be heated significantly Consequences; when the axial thickness W2 of the second arc segment 212 is greater than 3 times the axial thickness W1 of the first arc segment 211 , it may cause the bottom of the platinum channel 10 (ie the second arc 12 ) Consequences of overheating, but also lead to increased manufacturing costs.

In an embodiment of the present invention, as shown in FIGS. 1 and 6 , the upward offset of the center of the outer ring 22 relative to the center of the platinum channel 10 is 10% to 60% of the diameter of the platinum channel 10 . %, so that more current is obtained under the outer ring 22 . When the upward offset of the center of the outer ring 22 relative to the center of the platinum channel 10 exceeds 60% of the diameter of the platinum channel 10 , it may cause the bottom of the platinum channel 10 (ie the second arc 12 ) As a result of overheating, and the upward offset of the center of the outer ring 22 relative to the center of the platinum channel 10 is less than 10% of the diameter of the platinum channel 10, it may cause the bottom of the platinum channel 10 (that is, the first Two arcs 12) heating is not obvious consequences.

In an embodiment of the present invention, as shown in FIGS. 1 and 6 , the outer ring 22 is provided with choke holes 23 , and the choke holes 23 are symmetrically arranged along the symmetry line Y. The hole 23 is located above the inner ring 21 . The choke hole 23 provided above the outer ring 22 is used to block the current directly transmitted to the first arc segment 211 along the upper central position of the outer ring 22 . That is, in this embodiment, the choke hole 23 is provided, so that the alternating current transmitted to the first arc segment 211 above the outer ring 22 is detoured, that is, the current flow path is increased to indirectly increase the length of the conductor, that is, according to The conductor resistance calculation formula (as described above), the conductor resistance R above the outer ring 22 that runs from the left and right sides of the choke hole 23 has a larger value than when the choke hole 23 is not installed The length of the current-carrying conductor increases the resistance value above the outer ring 22 . According to Ohm's theorem, the resistance of the upper part of the outer ring 22 is greater than the resistance of the lower part of the outer ring 22, so that the current distributed by the second arc segment 212 is greater than the current distributed by the first arc segment 211, and is determined by the The second arc segment 212 passes more current to the second arc 12, so that the second arc 12 obtains more electric heating power, thereby increasing the number of the second arc 12. temperature.

Optionally, the shape of the choke hole 23 is an elongated shape, a meniscus shape or a dovetail shape in a radial section. Of course, in other embodiments, the choke hole 23 may also be set in other shapes, which are not limited herein.

Further, with continued reference to FIGS. 1 and 6 , the flange 20 further includes electrodes 24 in electrical contact with the flange 20 and serves to connect the flange 20 through cables, bus bars or other electrical conductors. connected to the power supply.

Further, as shown in FIGS. 1 and 2 , the heating device for molten glass further includes a cooling pipe 30 , and the cooling pipe 3 is arranged around the outer side of the outer ring 22 to cool the flange 20 , The flange 20 is prevented from being worn out due to the high temperature of the flange 20 . Cooling water or compressed air flows through the cooling pipe 30 . Alternatively, other cooling substances pass through the cooling pipe 30, which is not limited herein.

Optionally, the cooling pipe 30 is made of copper or nickel. Alternatively, the cooling pipe 30 may also be made of other materials, which is not limited herein.

Further, as shown in FIG. 10 , the heating device for molten glass further includes a plurality of reinforcing members 40 , and the plurality of reinforcing members 40 are arranged at intervals on the top of the platinum channel 10 along the length direction of the platinum channel 10 . The inner side wall is used to prevent the tube wall of the platinum channel 10 from collapsing.

Optionally, the reinforcing member 40 is a reinforcing rib, the width of the reinforcing rib is 5 mm to 20 mm, the thickness of the reinforcing rib is 0.5 mm to 1.5 mm, and the spacing distance between the reinforcing ribs is 200 mm to 500 mm.

Specifically, as shown in FIG. 11 , the flange 20 includes a plurality of flanges 20 , and the heating device for molten glass further includes a power supply member 50 , and two ends of the power supply member 50 are respectively connected to two adjacent flanges The current of 20 is connected to the lead-out end 24 to heat the platinum channel 10 (such as the container of the refining section) between two adjacent flanges 20 . That is, the power supply member 50 , the two adjacent flanges 20 , and the platinum channel 10 form a heating loop.

The above descriptions are only optional embodiments of the present invention, and are not intended to limit the scope of the present invention. All under the concept of the present invention, the equivalent transformations made by the contents of the description and drawings of the present invention, or directly/indirectly applied in Other related technical fields are included within the scope of patent protection of the present invention.

Claims (10)

1. a heating device for molten glass, having a line of symmetry along a vertical direction, is characterized in that, comprising: The platinum channel, the wall thickness of which varies in the circumferential direction; the radial section of the platinum channel includes a first circular arc located above and a second circular arc located below, the first circular arc and the second circular arc enclosing A radial section of the platinum channel is formed, the radial thickness of the second circular arc is greater than the radial thickness of the first circular arc, and both the first circular arc and the second circular arc are along the symmetry line Symmetrical setup; A flange is sleeved on the outer wall surface of the platinum channel and is in electrical contact with the platinum channel, the flange includes an inner ring and an outer ring peripherally connected to the inner ring; the inner ring includes a first ring located above an arc segment and a second arc segment located below, the first arc segment and the second arc segment enclose the inner ring, and the first arc segment and the second arc segment are symmetrical along the symmetry line The axial thickness of the first arc segment is smaller than the axial thickness of the second arc segment; the inner ring is arranged concentrically with the platinum channel, and the outer ring is vertically opposite to the platinum channel Channel up eccentric setting. 2 . The heating device for molten glass according to claim 1 , wherein the radial cross-sectional area of the second arc is 30% to 60% of the radial cross-sectional area of the platinum channel. 3 . 3 . The heating device for molten glass according to claim 1 , wherein the axial thickness of the second arc segment is 1.2 to 3 times the axial thickness of the first arc segment. 4 . 4 . The heating device for molten glass according to claim 1 , wherein the upward offset of the center of the outer ring relative to the center of the platinum channel is 10% to 60% of the diameter of the platinum channel. 5 . . 5 . The heating device for molten glass according to claim 1 , wherein the outer ring is provided with choke holes, and the choke holes are symmetrically arranged along the symmetry line, so that the The choke hole is located above the inner ring. 6 . The heating device for molten glass according to claim 5 , wherein the shape of the choke hole in the radial section is a long strip, a meniscus or a dovetail. 7 . 7. The heating device for molten glass according to any one of claims 1-4, characterized in that, the heating device for molten glass further comprises a cooling pipe, and the cooling pipe is arranged around the outer ring, and A cooling medium is passed through the cooling pipe. 8. The heating device for molten glass according to any one of claims 1-4, wherein the heating device for molten glass further comprises a plurality of reinforcing members, and a plurality of the reinforcing members are along the platinum channel. The length direction is spaced apart on the inner sidewall surface of the top of the platinum channel. 9. The heating device for molten glass according to any one of claims 1-4, wherein the shape of the radial cross-section of the platinum channel is a circle, a rectangle, a triangle, a trapezoid, a parallelogram, an ellipse or runway shape. 10. The heating device for molten glass according to any one of claims 1-4, wherein the material of the inner ring is a platinum-series precious metal or a platinum-series precious metal alloy; the material of the outer ring is a purity of at least 99wt% nickel.

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