Silo interior buffer cleaning segment device and using method thereof

Abstract

The invention relates to the field of silo cleaning equipment, in particular to a silo interior buffer cleaning segment device and a using method thereof.The silo interior buffer cleaning segment device comprises a combined silo, a cleaning anti-falling segment is installed in the middle of the combined silo, and a plurality of anti-falling control modules are installed in the cleaning anti-falling segment; a rubber baffle is installed on the outer portion of the end, facing the center of the cleaning anti-falling segment, of each anti-falling control module, and a rubber baffle linkage control assembly used for being in linkage with the anti-falling control modules is installed between the other ends of every two adjacent anti-falling control modules. A continuous blocking plane can be formed, cleaned and stripped material fragments are effectively intercepted, the fragments are prevented from directly falling to the bottom bin section from the upper portion of the bin body, impact abrasion to the bottom bin section is remarkably reduced, the overall service life of the silo is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of silo cleaning equipment, specifically to a buffer cleaning section device for the inside of a silo and its usage method. Background Technology

[0002] In the unloading area of ​​the dock, silos are often used as mineral storage equipment. When storing minerals, they contain a certain amount of moisture and tend to adhere to the inner wall of the silo. The adhered minerals need to be cleaned in time to avoid caking.

[0003] In existing silo cleaning operations, the inner walls are typically rinsed directly with high-pressure water only after the ore has been discharged from the silo. This method has two significant problems:

[0004] First, it can only be done after the silo has been emptied, as the empty space at the top of the silo is prone to premature hardening.

[0005] Secondly, the lack of a dedicated anti-fall protection structure causes the fragments to fall directly from the top of the silo to the bottom during the empty silo washing and stripping process. The falling fragments will cause serious impact and wear to the bottom silo section, shorten the service life of the silo and increase maintenance costs. To address this, a buffer cleaning section device for the inside of the silo and its usage method are proposed. Summary of the Invention

[0006] In order to solve the technical problems existing in the prior art, the present invention provides a buffer cleaning section device for silo interior and its usage method.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a buffer cleaning section device inside a silo, comprising a combined silo, wherein a cleaning and anti-fall section is installed in the middle of the combined silo, and a plurality of anti-fall control modules are installed inside the cleaning and anti-fall section. Each set of anti-fall control modules has a rubber baffle installed on the outside of one end facing the center of the cleaning and anti-fall section, and a rubber baffle linkage control component for linkage control of the anti-fall control modules is installed between the other ends of two adjacent sets of anti-fall control modules.

[0008] Preferably, the modular silo includes a bottom section and an upper section. The bottom section is fixed inside the support legs, several sets of upper sections are assembled on top of the bottom section, and several cleaning and anti-fall sections are assembled between two adjacent sets of upper sections.

[0009] Preferably, the fall protection control module includes a bottom bearing and a transmission rod. Several sets of the bottom bearings are installed at equal intervals in the middle of the cleaning fall protection section. A transmission rod is installed inside each set of the bottom bearings. A rubber baffle is provided on the outside of each set of the transmission rods facing the center end of the cleaning fall protection section.

[0010] Preferably, each set of transmission rods has multiple water outlets on its exterior that face the cleaning and anti-fall section, and the water outlets have a swept-back inclined design.

[0011] Preferably, the rubber baffle is fan-shaped, with the sidewalls of two adjacent sets of rubber baffles abutting each other, the surface of the rubber baffle is inclined, and the side of the rubber baffle facing the center of the cleaning and anti-fall section is higher than the other side of the rubber baffle.

[0012] Preferably, the rubber baffle linkage control assembly includes a rotary linkage rod, a first transverse linkage rod, and a second transverse linkage rod. The rotary linkage rod is fixed to the outside of the other end of the transmission rod. One end of the first transverse linkage rod and the second transverse linkage rod are respectively connected to the lower part of the rotary linkage rod, and the other end of the first transverse linkage rod and the second transverse linkage rod are respectively connected to the lower part of the adjacent rotary linkage rod.

[0013] Preferably, the rubber baffle linkage control assembly further includes a lever, a lever handle, and a handle limiting sleeve. The lever is fixed to the surface of the rotating linkage rod, the lever handle is fitted inside the end of the lever, and the two sets of handle limiting sleeves are welded to the top two sides of the bottom bearing surface, respectively. The angle between the two sets of handle limiting sleeves and the rotating linkage rod is 30°.

[0014] Preferably, the fall protection control module is provided with an annular water supply assembly on its exterior. The water supply assembly includes a main water supply pipe, branch water supply outlets, and a main water inlet. The main water supply pipe surrounds the fall protection control module. The number of branch water supply outlets matches the number of transmission rods. Several groups of branch water supply outlets are installed at equal intervals in the inner wall of the main water supply pipe. Each group of branch water supply outlets is connected to a corresponding group of transmission rods. The main water inlet is installed at the middle position of the outer wall of the main water supply pipe.

[0015] Preferably, an annular sealing gasket is provided at the connection between the water supply port and the transmission rod. The sealing gasket is made of high-pressure resistant rubber material, and the inner wall of the sealing gasket is interference-fitted with the outer wall of the transmission rod, and the outer wall of the sealing gasket is tightly fitted with the inner wall of the water supply port.

[0016] The method for using the silo cleaning and fall-prevention section includes the following steps:

[0017] Step S1: Fix the bottom section inside the support leg, assemble several sets of upper sections on top of the bottom section, and then assemble the cleaning and anti-fall section between two adjacent sets of upper sections to complete the overall structure assembly.

[0018] Step S2: Connect the external high-pressure water pipe to the main inlet of the water supply component, ensuring that the connection is sealed.

[0019] Step S3: Rotate the lever handle of the rubber baffle linkage control component to disengage it from a set of handle limit sleeves. Pull the lever handle to drive the lever and the rotating linkage rod to rotate. Through the first and second lateral linkage rods, the transmission rods of all the fall prevention control modules rotate synchronously, so that the rubber baffle turns to a horizontal state. All the rubber baffles cooperate to form a continuous blocking plane. Then, thread the lever handle to another set of handle limit sleeves to fix it.

[0020] Step S4: Start the external high-pressure water supply equipment. Water enters the main water supply pipe through the main inlet and is distributed to each group of transmission rods by the branch water supply outlets. Water is sprayed out from the swept-back outlets on both sides of the transmission rods, impacting the inner wall of the upper chamber section, causing the attached fragments to peel off and fall onto the surface of the rubber baffle.

[0021] Step S5: After cleaning is completed, turn off the high-pressure water supply equipment, release the lever handle, and pull the lever in the opposite direction to make the transmission rod drive the rubber baffle to tilt. The debris slides down the rubber baffle to the surface of the rubber baffle of the lower cleaning anti-fall section. Repeat this operation to complete the cleaning of the entire silo. After the rubber baffle of the lowest silo cleaning anti-fall section rotates, it will pour the debris into the bottom silo section and discharge it through the bottom silo section.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. By setting up rubber baffles and rubber baffle linkage control components, the present invention can form a continuous blocking plane, effectively intercepting material fragments that are washed and stripped, preventing fragments from falling directly from the top of the silo to the bottom section, significantly reducing impact wear on the bottom section, extending the overall service life of the silo, and reducing maintenance costs.

[0024] 2. This invention utilizes the cooperation of the water supply component and the transmission rod. The swept-back inclined water outlet allows the water flow to evenly impact the inner wall of the silo, enabling segmented cleaning of the inner wall and preventing the upper part of the silo from hardening first. During non-cleaning stages, the water outlet can serve as a flow channel for airflow. The transmission rod can inject dry air into the silo or extract humid air from the silo, completing the exchange of airflow within the silo to maintain its dryness and further reduce the adhesion of debris caused by moisture. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the three-dimensional structure of the combined silo of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal buffer cleaning section device for silos according to the present invention;

[0028] Figure 4This is a cross-sectional view of the internal buffer cleaning section device for silos according to the present invention.

[0029] Figure 5 This is a schematic diagram of the rubber baffle flipping up according to the present invention;

[0030] Figure 6 This is a schematic diagram of the misaligned engagement of the rubber baffle of the present invention;

[0031] Figure 7 This is a schematic diagram of the rubber baffle linkage control component of the present invention;

[0032] Figure 8 This is a schematic diagram of the transmission rod structure of the present invention;

[0033] Figure 9 This is a schematic diagram of the water spraying mechanism of the transmission rod of the present invention.

[0034] The numbers in the diagram represent: 1. Modular silo; 11. Bottom silo section; 12. Upper silo section; 2. Cleaning and anti-fall section; 3. Anti-fall control module; 31. Bottom bearing; 32. Transmission rod; 4. Rubber baffle; 5. Rubber baffle linkage control assembly; 51. Rotary linkage rod; 52. First lateral linkage rod; 53. Second lateral linkage rod; 54. Toggle lever; 55. Toggle lever handle; 56. Handle limit sleeve; 6. Water supply assembly; 61. Main water supply pipe; 62. Sub-water supply inlet; 63. Main water inlet. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, which illustrate the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0036] Example:

[0037] like Figures 1-9 As shown, the present invention provides a buffer cleaning section device for an internal silo, including a combined silo 1, a cleaning and anti-fall section 2 installed in the middle of the combined silo 1, a plurality of anti-fall control modules 3 installed inside the cleaning and anti-fall section 2, a rubber baffle 4 installed on the outside of one end of each anti-fall control module 3 facing the center of the cleaning and anti-fall section 2, and a rubber baffle linkage control component 5 for linkage between the other ends of two adjacent anti-fall control modules 3.

[0038] The modular silo 1 includes a bottom section 11 and an upper section 12. The bottom section 11 is fixed inside the support legs. Several sets of upper sections 12 are assembled on top of the bottom section 11. Several cleaning and anti-fall sections 2 are assembled between two adjacent sets of upper sections 12. The cleaning and anti-fall sections 2 located below the upper section 12 can clean and prevent debris adhering to the inner wall of the upper section 12. During the cleaning process, the debris is prevented from falling directly from above the upper section 12 to the bottom section 11, thus reducing the impact and wear on the bottom section 11.

[0039] The fall protection control module 3 includes a bottom bearing 31 and a transmission rod 32. Several sets of bottom bearings 31 are installed at equal intervals in the middle of the cleaning fall protection section 2. Each set of bottom bearings 31 has a transmission rod 32 installed inside it. Each set of transmission rods 32 has a rubber baffle 4 installed on the outside of one end facing the center of the cleaning fall protection section 2. The inside of the transmission rod 32 is hollow. Each set of transmission rods 32 has multiple water outlets facing the cleaning fall protection section 2 on the outside. The water outlets have a swept-back inclined design. After the cleaning water enters the interior of the transmission rod 32, the water is sprayed out at an angle under the restriction of the water outlets of the transmission rod 32. The sprayed water directly hits a portion of the inner wall of the upper chamber section 12. The water sprayed from multiple outlets completely covers the inner wall of the upper chamber section 12 corresponding to the drive rod 32. All drive rods 32 cooperate to completely cover the inner wall of the upper chamber section 12. The debris adhering to the inner wall is peeled off under the impact of the water flow. The peeled debris falls onto the surface of the rubber baffle 4. In the non-cleaning stage, the outlet can serve as a flow channel for airflow. Dry air can be injected into the silo or humid air can be extracted from the silo through the drive rod 32 to complete the exchange of airflow in the silo, so as to keep the inside of the silo dry and further reduce the adhesion of debris caused by water vapor.

[0040] The rubber baffle 4 has a fan-shaped design, with the sidewalls of two adjacent sets of rubber baffles 4 abutting each other. The surface of the rubber baffle 4 is inclined, with the side of the rubber baffle 4 facing the center of the cleaning and anti-fall section 2 being higher than the other side. Driven by the transmission rod 32, the rubber baffle 4 can rotate. When the rubber baffle 4 rotates to a horizontal state, all sets of rubber baffles 4 work together to form a continuous blocking plane to prevent debris from falling. At this time, due to the outer high and inner low configuration of the rubber baffle 4, when the upper debris falls onto the surface of the rubber baffle 4, the rubber baffle 4 can block the debris, keeping it on the surface of the rubber baffle 4. After cleaning is completed, the transmission rod 32 is tilted, and the rubber baffle 4 changes from a horizontal to an inclined state under the drive of the transmission rod 32. The debris left on the surface of the rubber baffle 4 slides down and falls onto the surface of the rubber baffle 4 in another set of silo cleaning and anti-fall sections below. By cleaning and lowering in sections, the debris is prevented from directly impacting the bottom silo section 11.

[0041] The rubber baffle linkage control assembly 5 includes a rotating linkage rod 51, a first transverse linkage rod 52, and a second transverse linkage rod 53. The rotating linkage rod 51 is fixed to the outside of the other end of the transmission rod 32. One end of the first transverse linkage rod 52 and the second transverse linkage rod 53 are respectively connected to the lower part of the rotating linkage rod 51, and the other end of the first transverse linkage rod 52 and the second transverse linkage rod 53 are respectively connected to the lower part of the adjacent rotating linkage rod 51. When the transmission rod 32 rotates, the rotating linkage rod 51 fixed to the outside of the transmission rod 32 rotates synchronously with the rotation of the transmission rod 32. The ends of the first transverse linkage rod 52 and the second transverse linkage rod 53 move laterally synchronously under the drive of the rotating linkage rod 51. During the lateral movement, the first transverse linkage rod 52 and the second transverse linkage rod 53 pull and push the adjacent rotating linkage rods 51 on both sides respectively, thereby synchronously driving the adjacent rotating linkage rods 51 to move laterally by the same distance, realizing the synchronous adjustment of all sets of transmission rods 32. The rubber baffle 4 fixed to the end of the transmission rod 32 deflects with the rotation of the transmission rod 32.

[0042] The rubber baffle linkage control assembly 5 also includes a lever 54, a lever handle 55, and a handle limiting sleeve 56. The lever 54 is fixed to the surface of the rotating linkage rod 51. The lever handle 55 is sleeved inside the end of the lever 54. Two sets of handle limiting sleeves 56 are welded to the top two sides of the surface of the bottom bearing 31, respectively. The included angle between the two sets of handle limiting sleeves 56 and the rotating linkage rod 51 is 30°. The end of the lever handle 55 is threaded into one set of handle limiting sleeves 56. During cleaning, rotating the lever handle 55 causes it to retract from the handle limiting sleeve 56, and pulling the lever handle 55... The lever handle 55 drives the lever 54 to rotate. During the rotation of the lever 54, the transmission rod 32 is rotated synchronously. The rubber baffle 4 installed at the end of the transmission rod 32 rotates synchronously. During the rotation, the rubber baffle 4 changes from an inclined state to a straight state. All the rubber baffles 4 cooperate with each other to form a continuous blocking plane in the inner wall of the cleaning anti-fall section 2 to prevent debris from falling. At this time, the end of the lever handle 55 is aligned with another set of handle limiting sleeves 56. Rotating the lever handle 55 makes the lever handle 55 threadedly connected to the other set of handle limiting sleeves 56. At this time, the positions of all sets of rubber baffles 4 remain fixed.

[0043] The fall protection control module 3 is externally equipped with a ring-shaped water supply component 6. The water supply component 6 includes a main water supply pipe 61, branch water inlets 62, and a main water inlet 63. The main water supply pipe 61 surrounds the fall protection control module 3. The number of branch water inlets 62 matches the number of transmission rods 32. Several branch water inlets 62 are installed at equal intervals in the inner wall of the main water supply pipe 61. Each branch water inlet 62 is connected to a corresponding set of transmission rods 32. The main water inlet 63 is installed on the outer wall of the main water supply pipe 61. At the middle position, when cleaning the inner wall of the silo, the external high-pressure water pipe is connected to the main water inlet 63. After the connection is completed, water is injected into the main water supply pipe 61 through the cooperation of the high-pressure water pipe and the main water inlet 63. The main water supply pipe 61 distributes the water evenly to each group water supply port 62 and supplies water to the transmission rod 32 through the group water supply port 62. The water is sprayed out through the transmission rod 32 and rushes to the inner wall of the upper silo section 12. The mineral material attached to the inner wall of the upper silo section 12 is dispersed by the water.

[0044] Instructions for using the silo cleaning and anti-fall section:

[0045] The bottom section 11 is fixed inside the support leg, several sets of upper sections 12 are assembled on top of the bottom section 11, and the cleaning and anti-fall section 2 is assembled between two adjacent sets of upper sections 12 to complete the overall structure assembly.

[0046] Connect the external high-pressure water pipe to the main inlet 63 of the water supply component 6, and ensure that the connection is sealed.

[0047] Rotate the lever handle 55 of the rubber baffle linkage control assembly 5 to disengage it from a set of handle limit sleeves 56. Pull the lever handle 55 to drive the lever 54 and the rotating linkage rod 51 to rotate. Through the first horizontal linkage rod 52 and the second horizontal linkage rod 53, all the transmission rods 32 of the fall prevention control module 3 rotate synchronously, so that the rubber baffle 4 rotates to a horizontal state. All the rubber baffles 4 cooperate to form a continuous blocking plane. Then, thread the lever handle 55 to another set of handle limit sleeves 56 to fix it.

[0048] The external high-pressure water supply equipment is activated, and the water enters the main water supply pipe 61 through the main inlet 63. It is then distributed to each group of transmission rods 32 by the branch water supply outlets 62 and sprayed out from the swept-back outlets on both sides of the transmission rods 32. This impacts the inner wall of the upper silo section 12, causing the attached fragments to peel off and fall onto the surface of the rubber baffle 4 of the buffer cleaning section device inside the next silo.

[0049] After cleaning, turn off the high-pressure water supply equipment, release the lever handle 55, and pull the lever 54 in the opposite direction to make the transmission rod 32 drive the rubber baffle 4 to tilt. The debris slides down the rubber baffle 4 to the surface of the rubber baffle 4 of the lower cleaning anti-fall section. The whole silo is cleaned in sequence. After the rubber baffle 4 of the lowest silo cleaning anti-fall section rotates, the debris is poured into the bottom silo section 11 and discharged through the bottom silo section 11.

[0050] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A buffer cleaning section device for the inside of a silo, characterized in that, The system includes a modular silo (1), a cleaning and fall-prevention section (2) is installed in the middle of the modular silo (1), and several fall-prevention control modules (3) are installed inside the cleaning and fall-prevention section (2). Each set of fall-prevention control modules (3) has a rubber baffle (4) installed on the outside of one end facing the center of the cleaning and fall-prevention section (2), and a rubber baffle linkage control assembly (5) for linkage of the fall-prevention control modules (3) is installed between the other ends of two adjacent sets of fall-prevention control modules (3).

2. The silo internal buffer cleaning section device as described in claim 1, characterized in that, The combined silo (1) includes a bottom section (11) and an upper section (12). The bottom section (11) is fixed inside the support leg. Several sets of upper sections (12) are assembled on the top of the bottom section (11). Several cleaning and anti-fall sections (2) are assembled between two adjacent sets of upper sections (12).

3. The silo internal buffer cleaning section device as described in claim 2, characterized in that, The fall protection control module (3) includes a bottom bearing (31) and a transmission rod (32). Several sets of bottom bearings (31) are installed at equal intervals in the middle of the cleaning fall protection section (2). A transmission rod (32) is installed inside each set of bottom bearings (31). A rubber baffle (4) is provided on the outside of each set of transmission rods (32) facing the center of the cleaning fall protection section (2).

4. The silo internal buffer cleaning section device as described in claim 3, characterized in that, The transmission rod (32) has a hollow interior. Each set of transmission rods (32) has multiple water outlets facing the cleaning and anti-fall section (2) on its exterior. The water outlets are designed with a swept-back inclined shape.

5. The silo internal buffer cleaning section device as described in claim 3, characterized in that, The rubber baffle (4) is fan-shaped, and the sidewalls of two adjacent sets of rubber baffles (4) abut against each other. The surface of the rubber baffle (4) is inclined. The side of the rubber baffle (4) facing the center of the cleaning and anti-fall section (2) is higher than the other side of the rubber baffle (4).

6. The silo internal buffer cleaning section device as described in claim 1, characterized in that, The rubber baffle linkage control assembly (5) includes a rotating linkage rod (51), a first transverse linkage rod (52), and a second transverse linkage rod (53). The rotating linkage rod (51) is fixed to the outside of the other end of the transmission rod (32). One end of the first transverse linkage rod (52) and the second transverse linkage rod (53) are respectively connected to the lower part of the rotating linkage rod (51), and the other end of the first transverse linkage rod (52) and the second transverse linkage rod (53) are respectively connected to the lower part of the adjacent rotating linkage rod (51).

7. The silo internal buffer cleaning section device as described in claim 5, characterized in that, The rubber baffle linkage control assembly (5) also includes a lever (54), a lever handle (55), and a handle limiting sleeve (56). The lever (54) is fixed on the surface of the rotating linkage rod (51), and the lever handle (55) is sleeved inside the end of the lever (54). The two sets of handle limiting sleeves (56) are respectively welded to the top two sides of the surface of the bottom bearing (31). The angle between the two sets of handle limiting sleeves (56) and the rotating linkage rod (51) is 30°.

8. The silo internal buffer cleaning section device as described in claim 7, characterized in that, The fall protection control module (3) is provided with an annular water supply assembly (6) on its exterior. The water supply assembly (6) includes a main water supply pipe (61), branch water supply ports (62) and a main water inlet (63). The main water supply pipe (61) surrounds the fall protection control module (3). The number of branch water supply ports (62) matches the number of transmission rods (32). Several sets of branch water supply ports (62) are installed at equal intervals in the inner wall of the main water supply pipe (61). Each set of branch water supply ports (62) is connected to a set of transmission rods (32). The main water inlet (63) is installed in the middle of the outer wall of the main water supply pipe (61).

9. The silo internal buffer cleaning section device as described in claim 8, characterized in that, An annular sealing gasket is fitted at the connection between the water supply port (62) and the transmission rod (32). The sealing gasket is made of high-pressure resistant rubber material, and the inner wall of the sealing gasket is interference-fitted with the outer wall of the transmission rod (32). The outer wall of the sealing gasket is tightly fitted with the inner wall of the water supply port (62).

10. A method of using the silo cleaning anti-fall section according to any one of claims 1-9, characterized in that: Includes the following steps: Step S1: Fix the bottom section (11) inside the support leg, assemble several sets of upper sections (12) on the top of the bottom section (11), and then assemble the cleaning and anti-fall section (2) between two adjacent sets of upper sections (12) to complete the overall structure assembly. Step S2: Connect the external high-pressure water pipe to the main inlet (63) of the water supply component (6) and ensure that the connection is sealed. Step S3: Rotate the lever handle (55) of the rubber baffle linkage control assembly (5) to make it retract from a set of handle limit sleeves (56), pull the lever handle (55) to drive the lever (54) and the rotating linkage rod (51) to rotate, and through the first horizontal linkage rod (52) and the second horizontal linkage rod (53) to link all the transmission rods (32) of the anti-fall control module (3) to rotate synchronously, so that the rubber baffle (4) rotates to a horizontal state, and all the rubber baffles (4) cooperate to form a continuous blocking plane, and then thread the lever handle (55) to another set of handle limit sleeves (56) to fix it. Step S4: Start the external high-pressure water supply equipment. Water enters the main water supply pipe (61) through the main inlet (63), is distributed to each group of transmission rods (32) by the branch water supply outlet (62), and sprays out from the sweeping outlets on both sides of the transmission rods (32), impacting the inner wall of the upper chamber section (12), causing the attached fragments to peel off and fall onto the surface of the rubber baffle (4). Step S5: After cleaning is completed, turn off the high-pressure water supply equipment, release the lever handle (55), and pull the lever (54) in the opposite direction to make the transmission rod (32) drive the rubber baffle (4) to tilt. The fragments slide down the rubber baffle (4) to the surface of the rubber baffle (4) of the lower cleaning anti-fall section. The whole silo is cleaned in sequence. After the rubber baffle (4) of the lowest silo cleaning anti-fall section rotates, the fragments are poured into the bottom silo section (11) and discharged through the bottom silo section (11).

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