Double-cone silo bulk material storage device and its discharge method

Abstract

A dual-cone silo bulk material storage device includes a sealed silo, comprising an upper cubic silo and two conical silos arranged side-by-side. The top of the cubic silo has at least one inlet, covered by a cap. The lower part of each conical silo is connected to a discharge system, which is fixed to the sealed silo. A breathing system is also fixed to the sealed silo. The discharge system includes two horizontal augers, one below the tip of each conical silo. The outer wall of each horizontal auger has multiple discharge through-holes, connecting its interior to the bottom of the conical silo. The outlet of each horizontal auger connects to its inlet. This invention also discloses a discharge method for the dual-cone silo bulk material storage device. Compared to the prior art, the technical advantage of this invention is that it features two conical silos, each equipped with an internal breathing system, preventing the formation of high-density zones within the silos and ensuring smooth discharge.

Description

Technical Field

[0001] This invention relates to a double-cone silo bulk material storage device, which is particularly applicable to industries handling bulk materials such as bulk cement, flour, grain, and feed. Background Technology

[0002] Currently, our company has developed a "multi-functional bulk material storage vehicle," as detailed in Chinese Patent Publication No. CN111055896A. It is capable of transporting bulk materials in batches; however, the discharge from the storage vehicle is not smooth.

[0003] Therefore, further improvements are needed. Summary of the Invention

[0004] The technical problem this invention aims to solve is: how to design a storage cart / storage device with smooth material discharge.

[0005] The specific technical solution of the present invention is as follows:

[0006] A double-cone silo bulk material storage device includes a sealed silo, comprising an upper cubic silo and two conical silos arranged side by side. The top of the cubic silo has at least one inlet with a fixed cover. The lower part of each conical silo is connected to a discharge system, which is fixed to the sealed silo. A breathing system is fixed to the sealed silo. The discharge system includes two horizontal augers, one below the tip of each conical silo. The outer wall of the horizontal auger has multiple discharge through holes, which connect the interior of the horizontal auger to the bottom of the conical silo. The outlet of the horizontal auger connects to the inlet end of the horizontal auger. The breathing system includes one external breathing pipe and two internal breathing pipes. The external breathing pipe is located at the top of the sealed silo and connects to the interior of the sealed silo through multiple breathing holes. One end of the external breathing pipe extends to the outside of the sealed silo and connects to the outside. The internal breathing pipes are located inside the sealed silo, and their number depends on the length of the sealed silo. The internal breathing pipes are vertically arranged, with their lower ends connecting to the interior of the horizontal augers and their upper ends connecting to the top space of the sealed silo.

[0007] The breathing system includes multiple parallel internal breathing tubes, which are arranged alternately with the discharge through-holes.

[0008] The outlets of the two horizontal augers are connected in parallel to the bottom of the horizontal augers via connecting pipes.

[0009] A dust collection bag is installed at the feed inlet. The wall of the feed inlet extends upward to form a raised ring. The opening of the dust collection bag is fitted onto the outside of the raised ring. A hoop is installed outside the opening of the bag to fasten the opening of the bag to the raised ring.

[0010] A method for discharging bulk material from a double-cone silo storage device, wherein the bulk material is cement, and the aforementioned double-cone silo bulk material storage device is used; during discharge, the horizontal auger is activated to transport the cement out. Cement in the sealed silo continuously enters the horizontal auger through the discharge port. When a vacuum zone may occur in the sealed silo, the pressure in the space between the lower surface of the cement in the sealed silo and the horizontal auger is less than atmospheric pressure. At this time, the top space of the sealed silo is connected to the outside world through an external breather pipe, and the pressure is the same as the outside world. Air in the top space of the sealed silo enters the negative pressure space through an internal breather pipe to avoid the vacuum zone, so that the cement in the sealed silo continuously enters the horizontal auger through the discharge port. As the horizontal auger continuously transports the cement out, the discharge is completed.

[0011] Compared with the prior art, the technical effect of the present invention is that the present invention has two conical chambers, each of which is equipped with an internal breathing system, which can prevent the formation of high-density areas inside the conical chambers and ensure smooth material discharge. Attached Figure Description

[0012] Figure 1 This is a schematic diagram illustrating the principle of bulk material discharge.

[0013] Figure 2 This is a schematic diagram (a) of the present invention.

[0014] Figure 3 This is a schematic diagram (a) showing the removal of part of the silo plate according to the present invention.

[0015] Figure 4 This is a schematic diagram (II) showing the removal of part of the silo plate according to the present invention.

[0016] Figure 5 This is a schematic diagram (II) of the present invention.

[0017] Figure 6 This is a bottom view diagram of the present invention.

[0018] Figure 7 for Figure 6 A schematic diagram of the AA cross-section.

[0019] Figure 8 for Figure 7 Enlarged schematic diagram of the connection between the feed inlet and the dust collector bag. Detailed Implementation

[0020] Our company's research has revealed that the reason for the uneven material discharge from the silo is as follows:

[0021] like Figure 1A typical silo is a sealed silo with a discharge port 901 at the bottom. When bulk materials (hereinafter referred to as "materials") are discharged, a lower vacuum zone 902 is formed in the space after the material flows out. The air in the gaps of the material adjacent to the lower vacuum zone 902 is extracted, and the material itself is compressed to form a high-density layer 903 (also known as an arch). The density of the high-density layer 903 is much greater than that of the normal material zone 900. According to the principles of powder mechanics, there is adhesion between powder particles. When the powder particles are small, they are prone to agglomeration due to the presence of adhesion. The adhesion between particles includes van der Waals forces, electrostatic attraction, magnetic forces, and mechanical interlocking forces. After the high-density layer 903 is formed, its own adhesion is much greater than that of the normal material zone 900, forming a solid layer that can resist the gravity of the normal material zone 900. In this way, the high-density layer 903 becomes a protective layer, preventing the normal material zone 900 from falling normally.

[0022] Meanwhile, as the material is discharged, as the normal material zone 900 continues to fall, an upper vacuum zone 904 will form above the normal material zone 900. The upper vacuum zone 904 will exert an attractive force on the normal material zone 900 and may even form a high-density layer, which will also hinder the discharge of material.

[0023] Our company has concluded that the new double-cone silo bulk material storage device needs to break the lower vacuum zone 902 and the upper vacuum zone 904 in order to ensure the smooth discharge of materials.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 2-8 A double-cone silo bulk material storage device includes a sealed silo 100, which is a silo for storing bulk materials. The sealed silo 100 includes an upper cubic silo 110 and two conical silos 120 arranged side by side. The top of the cubic silo 110 is provided with at least one inlet 101, and the inlet 101 is fixed with a cover 102. The lower part of each conical silo 120 is connected to a discharge system, which is fixed on the sealed silo 100. A breathing system is fixed on the sealed silo 100.

[0026] like Figure 2-5 The discharge system includes two horizontal augers 200. Each conical chamber 120 has a horizontal auger 200 located below its cone tip. The outer wall of each horizontal auger 200 has multiple discharge through-holes 201, which connect the interior of the horizontal auger 200 to the bottom of the conical chamber 120. The outlet of the horizontal auger 200 connects to the inlet of the horizontal auger 220. The horizontal augers 200 are positioned at a low level to facilitate the automatic discharge of all material from the sealed chamber 100. However, in some cases, the inlet of the receiving equipment may be relatively high (e.g., a cement mixer). Therefore, the horizontal auger 220 is installed to raise the height of the discharge outlet of the discharge system.

[0027] like Figure 2-5 The breathing system includes an external breathing tube 420 and two internal breathing tubes 300. The external breathing tube 420 is located at the top of the sealed chamber 100 and connects to the interior of the sealed chamber 100 through multiple breathing holes 421. One end of the external breathing tube 420 extends to the outside of the sealed chamber 100 and is connected to the outside (see reference numeral 400 in the attached figure). The function of the external breathing tube 420 is to connect the top space inside the sealed chamber 100 with the outside, facilitating the breaking of the upper vacuum zone 904 mentioned above.

[0028] like Figure 2-5 The internal breathing tube 300 is located inside the sealed chamber 100. The number of internal breathing tubes depends on the length of the sealed chamber 100. The internal breathing tubes 300 are vertically arranged, with their lower ends connected to the interior of the horizontal auger 200 (see reference numeral 301) and their upper ends (see reference numeral 421) connected to the top space of the sealed chamber 100 (see reference numeral 302). The function of the internal breathing tube 300 is to facilitate the breaking of the lower vacuum zone 902 mentioned above by connecting the top and bottom spaces within the sealed chamber 100. When feeding from the inlet 101, material may enter the internal breathing tube 300 from its upper end, potentially blocking it. Therefore, the upper end of the internal breathing tube 300 should be as close as possible to the inner wall of the sealed chamber 200 top, ensuring that air can enter and exit from its upper end.

[0029] like Figure 2-5 To ensure even air intake, the breathing system includes multiple parallel internal breathing pipes 300, which are staggered with the discharge through-holes 201. This allows for more uniform air intake from the outside.

[0030] like Figure 2-5 To facilitate material discharge, the outlets of the two horizontal augers 200 are connected in parallel to the bottom of the horizontal auger 220 via connecting pipes 210.

[0031] When bulk materials are fed into the silo, they are generally fed through the inlet 101. However, in practice, pneumatic conveying is also used. This involves using gas pressure to send a mixture of air and bulk materials into the sealed silo 100. The air escapes through the inlet 101, while the bulk materials remain inside the silo. To prevent escape, a filter screen is installed at the inlet 101. However, when the bulk material is cement, because cement powder is very fine, it can still escape through the filter screen.

[0032] like Figure 6-8A dust collection bag 500 is provided at the feed inlet 101. The wall of the feed inlet 101 extends upward to form a convex ring 1011. The bag opening 510 of the dust collection bag 500 is fitted on the outside of the convex ring 1011. A hoop 520 is provided outside the bag opening 510, and the hoop 520 fastens the bag opening 510 and the convex ring 1011 together.

[0033] See Figure 7 After opening the cover 102 (see attached reference numeral 1021), when the mixture of air and bulk material is introduced into the sealed chamber 100 through the outer port 401 of the external breather pipe 420, the space of the sealed chamber 100 is relatively large, and the air velocity decreases. At this time, the bulk material falls due to gravity, and the air blows the dust collection bag 500 up (see attached reference numeral 1021). Figure 7 The dust bag 500 is located in the middle position. At this time, compared with the effective filtration area of ​​ordinary filter screen, the dust bag 500 has a three-dimensional shape and its effective filtration area is larger. The air velocity through the dust bag is lower and the air carrying force of the material outer cover is weaker, which prevents the bulk material from escaping from the dust bag.

[0034] When the sealed compartment is 100% empty, see [link / reference]. Figure 7 The dust collection bags at the edge (see attached reference numeral 510) are in an extended state; when the sealed chamber 100 is full, the dust collection bags are made of flexible material and can be folded and gathered together (not shown in the figure), without affecting the loading capacity of the sealed chamber 100.

[0035] Its working principle is as follows:

[0036] The following explanation uses cement as an example.

[0037] During loading, at the very beginning, cement enters the sealed chamber 100 through the feed inlet 101 (or the external vent pipe 420). The cement falls to the tip of the cone chamber 120 or into the horizontal auger 200. The air in this area moves from the horizontal auger 200 and the internal vent pipe 300 to the top of the sealed chamber 100, and then escapes outward through the external vent pipe 420 (or from the feed inlet 101), thus avoiding the presence of an air zone at the tip of the cone chamber 120.

[0038] Then, as cement continues to enter the sealed chamber 100, the loading operation is completed.

[0039] During discharge, the horizontal auger 200 is activated to transport the cement out. The cement in the sealed chamber 100 continuously enters the horizontal auger 200 through the discharge port 201. When a vacuum zone may occur in the sealed chamber 100, the pressure in the space between the lower surface of the cement in the sealed chamber 100 and the horizontal auger 200 (hereinafter referred to as the negative pressure space) is less than atmospheric pressure. At this time, the top space of the sealed chamber 100 is connected to the outside world through the external breathing pipe 420 and has the same pressure as the outside world. The air in the top space of the sealed chamber 100 enters the negative pressure space through the internal breathing pipe 300 to avoid the vacuum zone and thus avoid the formation of the solid layer of high-density layer 903. This allows the cement in the sealed chamber 100 to continuously enter the horizontal auger 200 through the discharge port 201. As the horizontal auger 200 continuously transports the cement out, the discharge is completed.

[0040] Incidentally, to prevent cement arching, our company planned to add a vibrator to the outer wall of the sealed chamber 100 to break the cement arching through vibration. However, after testing, the vibrator may also make the cement arching stronger, making it less likely to be broken.

[0041] For other details, please refer to the existing technology.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A double-cone silo bulk material storage device, comprising a sealed silo (100), characterized in that: The sealed chamber (100) includes an upper cubic chamber (110) and two conical chambers (120) arranged side by side. The top of the cubic chamber (110) is provided with at least one feed inlet (101), and the feed inlet (101) is fixed with a cover (102). The lower part of each conical chamber (120) is connected to a discharge system, which is fixed on the sealed chamber (100). A breathing system is fixed on the sealed chamber (100). The discharge system includes two horizontal augers (200), and each conical chamber (120) has a horizontal auger (200) located below the cone tip. The outer wall of the horizontal auger (200) is provided with multiple discharge through holes (201), which connect the interior of the horizontal auger (200) with the bottom of the conical chamber (120). The outlet of the horizontal auger (200) is connected to the inlet end of the horizontal auger (220). The respiratory system includes an external breathing tube (420) and two internal breathing tubes (300). The external breathing tube (420) is located at the top of the sealed chamber (100). The external breathing tube (420) is connected to the interior of the sealed chamber (100) through multiple breathing holes (421). One end of the external breathing tube (420) extends to the outside of the sealed chamber (100) and is connected to the outside. The internal breathing tube (300) is located inside the sealed chamber (100), and the number of it depends on the length of the sealed chamber (100). The internal breathing tube (300) is set vertically, and the lower end of the internal breathing tube (300) is connected to the interior of the horizontal auger (200), and its upper end is connected to the top space of the sealed chamber (100). The cement in the sealed chamber (100) continuously enters the horizontal auger (200) through the discharge port (201), and as the horizontal auger (200) continuously transports the cement out, the discharge is completed.

2. The double-cone silo bulk material storage device as described in claim 1, characterized in that: The breathing system includes multiple parallel internal breathing tubes (300), which are arranged alternately with the discharge through-holes (201).

3. The double-cone silo bulk material storage device as described in claim 1, characterized in that: The outlets of the two horizontal augers (200) are connected in parallel to the bottom of the horizontal auger (220) via connecting pipes (210).

4. The double-cone silo bulk material storage device as described in claim 1, characterized in that: A dust collection bag (500) is provided at the feed inlet (101). The wall of the feed inlet (101) extends upward to form a convex ring (1011). The bag opening (510) of the dust collection bag (500) is fitted on the outside of the convex ring (1011). A hoop (520) is provided outside the bag opening (510). The hoop (520) fastens the bag opening (510) and the convex ring (1011) together.

5. A method for discharging bulk material from a double-cone silo bulk material storage device, wherein the bulk material is cement, characterized in that: Use the double-cone bulk material storage device as described in claim 1; During discharge, the horizontal auger (200) is activated to transport the cement out. The cement in the sealed chamber (100) continuously enters the horizontal auger (200) through the discharge port (201). When a vacuum zone may occur in the sealed chamber (100), the pressure of the space between the lower surface of the cement in the sealed chamber (100) and the horizontal auger (200) is less than atmospheric pressure. At this time, the top space of the sealed chamber (100) is connected to the outside world through the external breathing pipe (420) and the pressure is the same as that of the outside world. The air in the top space of the sealed chamber (100) enters the negative pressure space through the internal breathing pipe (300) to avoid the vacuum zone. This allows the cement in the sealed chamber (100) to continuously enter the horizontal auger (200) through the discharge port (201). As the horizontal auger (200) continuously transports the cement out, the discharge is completed.

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