Screen underflow chute for vibrating screen under blast furnace tank

Abstract

The utility model relates to an undersize material chute for a vibrating screen under a blast furnace tank, which relates to the technical field of iron-making raw material screening, and comprises a blanking square tube, the blanking square tube is arranged along the vertical direction, a blanking insertion plate is detachably arranged on the blanking square tube, and the blanking insertion plate is used for controlling the on-off of the blanking square tube. The top of the discharging square pipe is communicated with a lower chute, the top of the lower chute is communicated with an upper chute, the top of the upper chute is provided with a feeding port, one side of the lower chute is communicated with a transition square pipe, the transition square pipe is obliquely arranged, and the end, away from the lower chute, of the transition square pipe is communicated with an accident square pipe. The accident square tube is vertically arranged, an accident inserting plate is detachably arranged on the accident square tube, and the accident inserting plate is used for controlling connection and disconnection of the accident square tube. The method has the effects that the situation that the sinter vibrating screen stops running is reduced, and the normal running stability of the blast furnace is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ironmaking raw material screening, in particular to an undersize chute for a vibrating screen under a blast furnace trough. Background Art

[0002] After the blast furnace raw materials are screened through the vibrating screen, they are divided into qualified materials that meet the particle size requirements and powder materials that do not meet the standards. The qualified materials that meet the particle size requirements are immediately put into the blast furnace for smelting, while the powder materials that do not meet the standards are recovered through the undersize chute and re-sintered.

[0003] The Chinese patent with the authorization announcement number CN214183986U in the related art provides a device for re-screening blast furnace return ore in an ironmaking plant, which includes a screening chute and a return ore chute, the output end of the screening chute is connected to a sintered ore vibrating screen, the output end of the sintered ore vibrating screen is connected to an oversize collection bin, a screen undersize collection bucket is arranged below the sintered ore vibrating screen, and the screen undersize collection bucket is connected to the output end of the return ore chute. Blast furnace raw materials that do not need to be screened directly enter the undersize collection bucket through the return ore chute, and blast furnace raw materials that need to be screened enter the sintered ore vibrating screen through the screening chute. Under the screening action of the sintered ore vibrating screen, the blast furnace raw materials with particle size that meets the requirements enter the oversize collection bin to prepare for entering the furnace, and the blast furnace raw materials that do not meet the particle size requirements enter the undersize collection bucket, and the blast furnace raw materials in the undersize collection bucket are returned to the batching chamber through the belt conveyor below for re-sintering.

[0004] In the process of implementing this application, the inventors found that there are at least the following problems in this technology: when the belt conveyor fails, the bottom of the undersize collection bucket needs to be sealed, and then the belt conveyor needs to be shut down for maintenance. Since the screening speed of the sintered ore vibrating screen is high, the undersize collection bucket will reach saturation within half an hour after closing, thereby forcing the sintered ore vibrating screen to stop running, resulting in interruption of blast furnace operations. Utility Model Content

[0005] In order to reduce the situation where the sintering ore vibrating screen stops operating and improve the stability of the normal operation of the blast furnace, the present application provides an undersize chute for the under-tank vibrating screen of the blast furnace.

[0006] The present application provides a chute for undersize material of a blast furnace under-tank vibrating screen, which adopts the following technical solution:

[0007] A chute for undersize material of a vibrating screen under a blast furnace trough comprises a discharge square tube, the discharge square tube is arranged in a vertical direction, a discharge plug plate is detachably provided on the discharge square tube, the discharge plug plate is used to control the on and off of the discharge square tube, the top of the discharge square tube is connected to a lower chute, the top of the lower chute is connected to an upper chute, a feed port is provided on the top of the upper chute, a transition square tube is connected to one side of the lower chute, the transition square tube is inclined, an end of the transition square tube away from the lower chute is connected to an emergency square tube, the emergency square tube is vertically arranged, an emergency plug plate is detachably provided on the emergency square tube, the emergency plug plate is used to control the on and off of the emergency square tube.

[0008] By adopting the above technical scheme, the feed port of the upper chute is installed at the bottom of the vibrating screen. When the belt conveyor operates normally, the mobile emergency plug plate cuts off the emergency square pipe, and the mobile unloading plug plate conducts the unloading square pipe. The undersize produced by the vibrating screen enters the upper chute from the feed port, and the undersize in the upper chute falls downward into the lower chute, and the undersize in the lower chute falls onto the belt conveyor through the unloading square pipe. When the belt conveyor fails to operate, the mobile emergency plug plate conducts the emergency square pipe, and the mobile unloading plug plate cuts off the unloading square pipe. The undersize produced by the vibrating screen enters the upper chute from the feed port, and the undersize in the upper chute falls downward into the lower chute, and the undersize in the lower chute enters the accident square pipe through the transition square pipe, and the undersize in the accident square pipe falls onto the ground below. The undersize on the ground below is subsequently moved by a forklift. Therefore, when the belt conveyor fails, the situation of stopping the sintered ore vibrating screen is reduced, and the stability of normal operation of the blast furnace is improved.

[0009] Preferably, the transition square pipe includes a first transition pipe and a second transition pipe, the first transition pipe and the second transition pipe are both arranged at an angle, the top end of the first transition pipe is connected to the lower chute, a connecting flange is jointly arranged on the bottom end of the first transition pipe and the top end of the second transition pipe, the first transition pipe and the second transition pipe are connected to each other, and the bottom end of the second transition pipe is connected to the top end of the accident square pipe.

[0010] By adopting the above technical solution, a first transition pipe is installed on the side of the lower chute, and a second transition pipe is installed on the top of the accident square pipe. The first transition pipe and the second transition pipe are connected by a connecting flange, so as to facilitate the connection between the lower chute and the accident square pipe.

[0011] Preferably, the material unloading plug plate includes a material unloading cross plate and a group of material unloading abutment plates. A material unloading slot is opened on the side wall of the material unloading square tube. The material unloading cross plate is inserted in the material unloading slot. The side wall of the material unloading cross plate fits with the inner wall of the material unloading square tube. The opposite surface of the material unloading abutment plate is fixedly connected to the end wall of the material unloading cross plate. One of the material unloading abutment plates is located inside the material unloading square tube, and the other material unloading abutment plate is located outside the material unloading square tube. The side wall of the material unloading abutment plate is used to fit with the material unloading square tube.

[0012] By adopting the above technical scheme, when the square tube is cut off, the cutting plate is slid along the cutting groove so that the cutting abutment plate located in the square tube is away from the side of the cutting plate and fits with the inner wall of the square tube; when the square tube is connected, the cutting plate is slid along the cutting groove so that the cutting abutment plate located in the square tube is away from the side of the cutting plate and separates from the inner wall of the square tube, thereby achieving the effect of the cutting plug plate controlling the connection and disconnection of the square tube.

[0013] Preferably, the accident plug plate includes an accident transverse plate and a group of accident abutment plates. An accident slot is provided on the side wall of the accident square tube, and the accident transverse plate is inserted into the accident slot. The side wall of the accident transverse plate fits with the inner wall of the accident square tube, and the opposite surface of the accident abutment plate is fixedly connected to the end wall of the accident transverse plate. One of the accident abutment plates is located inside the accident square tube, and the other accident abutment plate is located outside the accident square tube. The side wall of the accident abutment plate is used to fit with the accident square tube.

[0014] By adopting the above technical scheme, when the accident square pipe is cut off, the accident horizontal plate is slid along the accident horizontal groove, so that the accident abutment plate located in the accident square pipe is away from one side of the accident horizontal plate and fits with the inner wall of the accident square pipe; when the accident square pipe is conducted, the accident horizontal plate is slid along the accident horizontal groove, so that the accident abutment plate located in the accident square pipe is away from one side of the accident horizontal plate and separates from the inner wall of the accident square pipe, thereby achieving the effect of the accident plug plate controlling the on and off of the accident square pipe.

[0015] Preferably, a plurality of buffer steps are provided on the inner bottom wall of the upper chute and the inner bottom wall of the lower chute.

[0016] By adopting the above technical scheme, when the screened materials fall downward in the upper chute and the lower chute, the screened materials will accumulate on the buffer step, and the subsequently falling screened materials will collide with the screened materials accumulated on the buffer step, thereby achieving the effect of material beating, effectively buffering the huge impact force exerted on the bottom of the upper chute and the bottom of the lower chute due to the height difference, and extending the service life of the upper chute and the lower chute.

[0017] Preferably, a ceramic lining is provided on the top of the buffer step.

[0018] By adopting the above technical solution, the ceramic lining is laid on the top of the buffer step, which reduces the wear of the top of the buffer step by the screened material and extends the service life of the buffer step.

[0019] Preferably, an I-shaped track is fixedly arranged on the top of the buffer step, and the ceramic lining is slidably arranged between the I-shaped track and the side of the buffer step, and the top wall of the ceramic lining is lower than the top wall of the I-shaped track.

[0020] By adopting the above technical solution, the ceramic lining is limited between the I-shaped track and the side of the buffer step. When the ceramic lining needs to be replaced, the ceramic lining is slid and taken out from between the I-shaped track and the side of the buffer step, thereby achieving the effect of facilitating the replacement of the ceramic lining.

[0021] Preferably, a ladder is fixedly arranged on the accident square pipe, an observation hole is opened on the top of the lower chute, and a detachable observation door is arranged on the top of the lower chute, and the observation door is used to cover the observation hole.

[0022] By adopting the above technical solution, during daily work, the staff can move up through the ladder on the accident square pipe, and then open the observation door to check the internal situation of the lower chute through the observation hole.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. By setting the material discharge square pipe, material discharge plug plate, lower chute, upper chute, feed port, transition square pipe, accident square pipe and accident plug plate, the situation of sintering ore vibrating screen stopping operation is reduced and the stability of normal operation of blast furnace is improved;

[0025] 2. By setting the first transition pipe, the second transition pipe and the connecting flange, the lower chute and the accident square pipe can be easily connected;

[0026] 3. By setting up buffer steps, the service life of the upper chute and the lower chute can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of an undersize chute for a blast furnace under-trough vibrating screen in an embodiment of the present application.

[0028] Figure 2 yes Figure 1 Enlarged view of part A.

[0029] Figure 3 It is a cross-sectional view showing the connection relationship between the blanking square tube and the blanking plug plate in the embodiment of the present application.

[0030] Figure 4 It is a cross-sectional view showing the connection relationship between the emergency square pipe and the emergency plug plate in the embodiment of the present application.

[0031] Figure 5 It is a cross-sectional view showing the positional relationship between the upper chute and the buffer step in the embodiment of the present application.

[0032] Figure 6 It is a cross-sectional view showing the positional relationship between the lower chute and the buffer step in the embodiment of the present application.

[0033] Explanation of the reference numerals in the accompanying drawings: 1. Unloading square tube; 11. Unloading slot; 2. Unloading plug plate; 21. Unloading horizontal plate; 22. Unloading abutment plate; 3. Lower chute; 31. Observation hole; 32. Observation plate; 4. Upper chute; 41. Feed port; 5. Transition square tube; 51. First transition tube; 52. Second transition tube; 53. Connecting flange; 6. Accident square tube; 61. Accident slot; 7. Accident plug plate; 71. Accident horizontal plate; 72. Accident abutment plate; 8. Buffer step; 81. Ceramic lining plate; 82. I-shaped track; 9. Ladder. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-6 This application is described in further detail.

[0035] The present application embodiment discloses a chute for undersize material of a blast furnace under-tank vibrating screen. Figures 1 to 5 , which includes a material discharge square pipe 1, which is arranged in the vertical direction. A material discharge plug plate 2 is detachably arranged on the material discharge square pipe 1, and the material discharge plug plate 2 is used to control the on and off of the material discharge square pipe 1. The top of the material discharge square pipe 1 is connected to the lower chute 3, and the top of the lower chute 3 is connected to the upper chute 4, and the top of the upper chute 4 is provided with a feed port 41. A transition square pipe 5 is connected to one side of the lower chute 3, and the transition square pipe 5 is arranged obliquely. An end of the transition square pipe 5 away from the lower chute 3 is connected to an accident square pipe 6, and the accident square pipe 6 is arranged vertically. An accident plug plate 7 is detachably arranged on the accident square pipe 6, and the accident plug plate 7 is used to control the on and off of the accident square pipe 6. The feed port 41 of the upper chute 4 is installed at the bottom of the vibrating screen, so that the screened material produced by the vibrating screen enters the upper chute 4 from the feed port 41. When the belt conveyor operates normally, the mobile accident plug plate 7 cuts off the accident square pipe 6, the mobile unloading plug plate 2 conducts the unloading square pipe 1, and the screened material produced by the vibrating screen enters the upper chute 4 from the feed port 41, and the screened material in the upper chute 4 falls downward into the lower chute 3, and the screened material in the lower chute 3 falls onto the belt conveyor through the unloading square pipe 1. When the belt conveyor stops operating due to a fault, the mobile accident plug plate 7 conducts the accident square pipe 6, the mobile unloading plug plate 2 cuts off the unloading square pipe 1, and the screened material produced by the vibrating screen enters the upper chute 4 from the feed port 41, and the screened material in the upper chute 4 falls downward into the lower chute 3, and the screened material in the lower chute 3 enters the accident square pipe 6 from the transition square pipe 5, and the screened material in the accident square pipe 6 falls onto the lower site, and the screened material on the lower site is subsequently moved by a forklift. Therefore, when the belt conveyor fails, the situation where the sintering ore vibrating screen stops operating is reduced, and the stability of the normal operation of the blast furnace is improved.

[0036] In order to facilitate the connection between the lower chute 3 and the accident side pipe 6, refer to Figure 1 and Figure 2The transition square pipe 5 includes a first transition pipe 51 and a second transition pipe 52, and the first transition pipe 51 and the second transition pipe 52 are both inclined. The top of the first transition pipe 51 is connected to the lower chute 3, and the bottom of the first transition pipe 51 and the top of the second transition pipe 52 are jointly installed with a connecting flange 53. The first transition pipe 51 and the second transition pipe 52 are connected to each other, and the bottom of the second transition pipe 52 is connected to the top of the accident square pipe 6. The first transition pipe 51 is installed on the side of the lower chute 3, and the second transition pipe 52 is installed on the top of the accident square pipe 6. The first transition pipe 51 and the second transition pipe 52 are connected by a connecting flange 53, so as to facilitate the connection between the lower chute 3 and the accident square pipe 6.

[0037] In order to make the material cutting plate 2 control the material cutting square tube 1 on and off, refer to Figures 1 to 3 The blanking insert plate 2 includes a blanking transverse plate 21 and a set of blanking abutment plates 22. A blanking slot 11 is provided on the side wall of the blanking square tube 1, and the inner wall of the blanking slot 11 is flush with the inner wall of the blanking square tube 1. The blanking transverse plate 21 is inserted into the blanking slot 11, and the side wall of the blanking transverse plate 21 fits the inner wall of the blanking square tube 1. The opposite surface of the blanking abutment plates 22 is welded to the end wall of the blanking transverse plate 21, wherein one of the blanking abutment plates 22 is located inside the blanking square tube 1, and the other blanking abutment plates 22 is located outside the blanking square tube 1, and the side wall of the blanking abutment plates 22 is used to fit the inner wall of the blanking square tube 1. When the blanking square tube 1 is cut off, the blanking cross plate 21 is slid along the blanking cross groove, so that the blanking abutment plate 22 located in the blanking square tube 1 is away from the side of the blanking cross plate 21 and fits with the inner wall of the blanking square tube 1. When the blanking square tube 1 is conducted, the blanking cross plate 21 is slid along the blanking cross groove, so that the blanking abutment plate 22 located in the blanking square tube 1 is away from the side of the blanking cross plate 21 and separates from the inner wall of the blanking square tube 1.

[0038] In order to make the accident plug board 7 control the accident side pipe 6 on and off, refer to Figures 1 to 4 The accident plug plate 7 includes an accident transverse plate 71 and a group of accident abutment plates 72. An accident slot 61 is provided on the side wall of the accident square tube 6, and the inner wall of the accident slot 61 is flush with the inner wall of the accident square tube 6. The accident transverse plate 71 is inserted into the accident slot 61, and the side wall of the accident transverse plate 71 fits with the inner wall of the accident square tube 6. The opposite surface of the accident abutment plate 72 is welded to the end wall of the accident transverse plate 71, one of the accident abutment plates 72 is located inside the accident square tube 6, and the other accident abutment plate 72 is located outside the accident square tube 6, and the side wall of the accident abutment plate 72 is used to fit with the inner wall of the accident square tube 6. When the accident square tube 6 is cut off, the accident transverse plate 71 is slid along the accident transverse groove, so that the accident abutment plate 72 located inside the accident square tube 6 fits with the inner wall of the accident square tube 6 away from the side of the accident transverse plate 71. When the accident square pipe 6 is conducted, the accident transverse plate 71 is slid along the accident transverse groove, so that the accident stop plate 72 located in the accident square pipe 6 is separated from the inner wall of the accident square pipe 6 away from one side of the accident transverse plate 71 .

[0039] In order to extend the service life of the upper chute 4 and the lower chute 3, refer to Figures 1 to 6 , a plurality of buffer steps 8 are set up on the bottom of the upper chute 4 and the bottom of the lower chute 3, so that the inner bottom wall of the upper chute 4 and the inner bottom wall of the lower chute 3 are both in the shape of continuously arranged steps. An I-shaped track 82 and a ceramic liner 81 are installed on the top of the buffer step 8, the top wall of the ceramic liner 81 is lower than the top wall of the I-shaped track 82, and the ceramic liner 81 is slidably connected to the I-shaped track 82. The bottom of the I-shaped track 82 is welded to the top of the buffer step 8, and the I-shaped track 82 is an I-shaped steel. One side of the ceramic liner 81 is fitted with the side of the buffer step 8, and the other side of the ceramic liner 81 is inserted into the groove of the I-shaped track 82 facing the side of the buffer step 8. When the screened material falls downward in the upper chute 4 and the lower chute 3, the screened material will hit the ceramic liner 81 on the top of the buffer step 8, reducing the wear of the screened material on the top of the buffer step 8 and extending the service life of the buffer step 8. When the undersize is accumulated on the ceramic lining 81 at the top of the buffer step 8, the undersize that falls later will collide with the undersize accumulated on the ceramic lining 81, achieving the effect of material beating, effectively buffering the huge impact force exerted on the bottom of the upper chute 4 and the bottom of the lower chute 3 due to the height difference, and extending the service life of the upper chute 4 and the lower chute 3. When the ceramic lining 81 needs to be replaced, the ceramic lining 81 is slid and taken out from between the I-shaped track 82 and the side of the buffer step 8, so as to achieve the effect of facilitating the replacement of the ceramic lining 81.

[0040] In order to facilitate the staff to check the internal situation of the lower chute 3, refer to Figures 1 to 6 A ladder 9 is installed on the side of the accident square pipe 6 for workers to climb. An observation hole 31 is opened on the top of the lower chute 3, and a detachable observation door is arranged on the top of the lower chute 3, and the observation door is used to cover the observation hole 31. During daily work, the workers move up through the ladder 9 on the accident square pipe 6, and then open the observation door to check the internal situation of the lower chute 3 through the observation hole 31.

[0041] The implementation principle of the undersize chute for the vibrating screen under the blast furnace trough of the present application embodiment is as follows: the feed port 41 of the upper chute 4 is installed at the bottom of the vibrating screen, so that the undersize produced by the vibrating screen enters the upper chute 4 from the feed port 41. When the belt conveyor operates normally, the accident plug plate 7 is moved to cut off the accident square pipe 6, and the unloading plug plate 2 is moved to conduct the unloading square pipe 1, and the undersize produced by the vibrating screen enters the upper chute 4 from the feed port 41, and the undersize in the upper chute 4 falls downward into the lower chute 3, and the undersize in the lower chute 3 falls onto the belt conveyor through the unloading square pipe 1. When the belt conveyor stops running due to a fault, the mobile accident plug board 7 conducts the accident square pipe 6, and the mobile unloading plug board 2 cuts off the unloading square pipe 1. The screened material produced by the vibrating screen enters the upper chute 4 from the feed port 41, and the screened material in the upper chute 4 falls downward into the lower chute 3. The screened material in the lower chute 3 enters the accident square pipe 6 through the transition square pipe 5, and the screened material in the accident square pipe 6 falls to the ground below. The screened material on the ground below is subsequently moved by a forklift. Therefore, when the belt conveyor fails, the situation of stopping the sintering ore vibrating screen is reduced, and the stability of normal operation of the blast furnace is improved.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A chute for undersize material of a blast furnace under-tank vibrating screen, comprising a square tube (1) for material discharge, wherein the square tube (1) is arranged in a vertical direction, Features: A material discharge plug plate (2) is detachably provided on the material discharge square tube (1), and the material discharge plug plate (2) is used to control the on and off of the material discharge square tube (1). A lower chute (3) is connected to the top of the material discharge square tube (1), and an upper chute (4) is connected to the top of the lower chute (3). A feed port (41) is provided on the top of the upper chute (4). A transition square tube (5) is connected to one side of the lower chute (3), and the transition square tube (5) is arranged obliquely. An end of the transition square tube (5) away from the lower chute (3) is connected to an accident square tube (6), and the accident square tube (6) is arranged vertically. An accident plug plate (7) is detachably provided on the accident square tube (6), and the accident plug plate (7) is used to control the on and off of the accident square tube (6).

2. The undersize chute for the blast furnace under-tank vibrating screen according to claim 1, Features: The transition square pipe (5) comprises a first transition pipe (51) and a second transition pipe (52). The first transition pipe (51) and the second transition pipe (52) are both arranged obliquely. The top end of the first transition pipe (51) is connected to the lower chute (3). A connecting flange (53) is provided on the bottom end of the first transition pipe (51) and the top end of the second transition pipe (52). The first transition pipe (51) and the second transition pipe (52) are connected to each other. The bottom end of the second transition pipe (52) is connected to the top end of the accident square pipe (6).

3. The undersize chute for the blast furnace under-tank vibrating screen according to claim 1, Features: The material unloading plug plate (2) comprises a material unloading transverse plate (21) and a group of material unloading abutment plates (22); a material unloading slot (11) is provided on the side wall of the material unloading square tube (1); the material unloading transverse plate (21) is inserted into the material unloading slot (11); the side wall of the material unloading transverse plate (21) is fitted with the inner wall of the material unloading square tube (1); the opposite surface of the material unloading abutment plate (22) is fixedly connected with the end wall of the material unloading transverse plate (21); one of the material unloading abutment plates (22) is located inside the material unloading square tube (1); the other material unloading abutment plate (22) is located outside the material unloading square tube (1); the side wall of the material unloading abutment plate (22) is used to fit with the material unloading square tube (1).

4. The undersize chute for the blast furnace under-tank vibrating screen according to claim 1, Features: The accident plug plate (7) comprises an accident transverse plate (71) and a group of accident abutment plates (72). An accident slot (61) is provided on the side wall of the accident square tube (6). The accident transverse plate (71) is inserted into the accident slot (61). The side wall of the accident transverse plate (71) fits with the inner wall of the accident square tube (6). The opposite surface of the accident abutment plate (72) is fixedly connected to the end wall of the accident transverse plate (71). One of the accident abutment plates (72) is located inside the accident square tube (6), and the other accident abutment plate (72) is located outside the accident square tube (6). The side wall of the accident abutment plate (72) is used to fit with the accident square tube (6).

5. The undersize chute for the blast furnace under-tank vibrating screen according to claim 1, Features: A plurality of buffer steps (8) are arranged on the inner bottom wall of the upper chute (4) and the inner bottom wall of the lower chute (3).

6. The undersize chute for the blast furnace under-tank vibrating screen according to claim 5, Features: A ceramic lining plate (81) is arranged on the top of the buffer step (8).

7. The undersize chute for the blast furnace under-tank vibrating screen according to claim 6, Features: An I-shaped track (82) is fixedly arranged on the top of the buffer step (8), and the ceramic lining plate (81) is slidably arranged between the I-shaped track (82) and the side of the buffer step (8), and the top wall of the ceramic lining plate (81) is lower than the top wall of the I-shaped track (82).

8. The undersize chute for the blast furnace under-tank vibrating screen according to claim 1, Features: A ladder (9) is fixedly arranged on the accident square pipe (6), an observation hole (31) is provided on the top of the lower chute (3), and a detachable observation door is provided on the top of the lower chute (3), and the observation door is used to cover the observation hole (31).

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