An admixture feeding device for concrete production

Abstract

This utility model relates to the field of concrete admixture preparation technology, specifically to an admixture feeding device for concrete production. It includes a feeding assembly, with a mixing assembly on one side of the feeding assembly, and the feeding assembly includes a mixing tank. In this utility model, after compressed air is introduced into a first air inlet pipe and a second air inlet pipe, the admixture raw materials first form a gas-liquid two-phase fluid in the first air inlet pipe. Then, multiple streams of gas-liquid two-phase fluid containing different admixture raw materials enter the mixing tank. Under the action of the airflow injected into the second air inlet pipe, these fluids are further transformed into a lower-density gas-liquid two-phase fluid in the guide tube. As the gas-liquid two-phase fluid rises in the guide tube, it flows through narrow channels and filter holes, breaking up the air bubbles into more microbubbles. The large number of microbubbles generate intense turbulence during their upward movement, thereby promoting thorough mixing between the various raw materials and improving the quality of the prepared concrete admixture.

Description

Technical Field

[0001] This utility model relates to the field of concrete admixture preparation technology, and more specifically, to an admixture feeding device for concrete production. Background Technology

[0002] Admixtures are a key component of concrete. Although used in small quantities, they play a dominant role in performance. Ready-mixed concrete companies commonly use compound admixtures, including water-reducing agents, retarders, air-entraining agents, and defoamers, to meet various performance requirements. Different raw materials and proportions lead to significant differences in admixture performance.

[0003] Using compound admixtures is common practice, but it has the following drawbacks: 1. It is uneconomical. For example, it is wasteful to prepare high-slump retention admixtures for distant construction sites and then use them for nearby sites. 2. It has a lag in adjustment. Retarder is sensitive to temperature. Sudden temperature changes in spring and autumn can easily lead to uncontrolled setting time and accidents. 3. It has poor compatibility. Special concrete requires special admixtures. The layout of storage tanks and pipelines is difficult and it is easy to misuse them, leading to quality accidents. Therefore, it is necessary to use a mixing and compounding device on the construction site to prepare the required concrete admixtures.

[0004] In existing technologies, mechanical stirring is commonly used to mix various admixture raw materials. However, due to the high viscosity of the main raw materials of admixtures (such as water-reducing mother liquor and slump-retarding mother liquor), some admixture raw materials will remain on the contact surface between the device and the raw materials. At the same time, if gravity or water pump is used for transportation, liquid adsorption will occur on the contact surface, resulting in the reduction of some admixture raw materials and affecting the accuracy of the proportion of each raw material. Although high-pressure water washing can remove the residue of this part of the admixture raw materials, it will increase the water consumption and interfere with the water metering. If the amount of washing water is too large, it will cause the water content of the concrete admixture to exceed the standard, thereby reducing the quality of the concrete admixture.

[0005] When this mechanical mixing method is used in mass production, the total amount of various raw materials is relatively large, so the impact on the accuracy of the proportion of each raw material is negligible. However, when small-dose compounding is carried out on the concrete production line, these issues have a very serious impact on the accuracy of the raw material proportion (when admixtures are compounded in large quantities, the amount of a single compounding is normally around 30 tons, while the amount of a single compounding on the concrete production line is only around 5 kg, a difference of about 6,000 times). Therefore, compounded admixtures with inaccurate raw material proportions will damage the performance of concrete and even cause safety hazards when used. Utility Model Content

[0006] The purpose of this utility model is to provide an admixture feeding device for concrete production, so as to solve the problems mentioned in the background art above:

[0007] In existing technologies, mechanical mixing is commonly used to mix various admixture raw materials. Some admixture raw materials may remain on the contact surface between the device and the raw materials, resulting in a reduction in the amount of some admixture raw materials. This affects the accuracy of the proportions of each raw material and reduces the quality of concrete admixtures.

[0008] To address the above problems, the present invention aims to provide a concrete admixture feeding device, including a feeding assembly. A mixing assembly is located on one side of the feeding assembly. The feeding assembly includes a mixing tank. A discharge pipe is fixedly installed near the bottom of one side of the mixing tank. An electromagnetic flowmeter and a flow regulating valve are sequentially fixedly installed at one end of the discharge pipe. A first air inlet pipe is fixedly installed on the water outlet pipe of the flow regulating valve. The first air inlet pipe and the water outlet pipe of the flow regulating valve form a three-way pipe structure. The mixing assembly includes a mixing tank. Several feed pipes are vertically arrayed and fixedly installed on the lower middle part of the circumferential side wall of the mixing tank. The end of the first air inlet pipe is fixedly connected to one of the feed pipes via a flange. A pneumatic mixing mechanism is installed inside the mixing tank. When the first air inlet pipe delivers the admixture raw material in a gas-liquid two-phase flow state into the mixing tank, the pneumatic mixing mechanism performs pneumatic mixing of the admixture raw material.

[0009] As a further improvement to this technical solution, the pneumatic mixing mechanism includes a guide tube coaxially fixed inside the mixing tank by a bracket. A perforated plate is fixedly installed at the upper end of the guide tube. The perforated plate 27 is provided with a plurality of filter holes. An overflow pipe is fixedly installed on the circumferential side wall of the mixing tank above the perforated plate. The overflow pipe is connected to the interior of the mixing tank.

[0010] As a further improvement to this technical solution, the pneumatic mixing mechanism also includes a second air inlet pipe located near the bottom of the mixing tank. One end of the second air inlet pipe passes through the side wall of the mixing tank and extends to the bottom center of the guide tube, and the second air inlet pipe is connected to the interior of the guide tube.

[0011] As a further improvement to this technical solution, the guide tube has several inlets arranged in a ring array near the bottom of its circumferential sidewall, and the inlets are located below the feed pipe.

[0012] As a further improvement to this technical solution, the pneumatic mixing mechanism also includes a spiral guide plate fixedly installed on the inner circumference of the mixing tank. The lower end of the spiral guide plate extends to a position corresponding to the height of the feed inlet, and the connection between the feed pipe and the mixing tank is located in the spiral gap of the spiral guide plate.

[0013] As a further improvement to this technical solution, the guide tube is an hourglass-shaped structure that is thick at both ends and thin in the middle, and the guide tube is set inside the spiral guide plate.

[0014] As a further improvement to this technical solution, a water scale assembly is provided on one side of the mixing assembly. The water scale assembly includes an electronic scale. A container with an opening facing upwards is placed on the upper side wall of the electronic scale. A conveying pipe is fixedly provided on the circumferential side wall of the container near the bottom.

[0015] As a further improvement to this technical solution, the end of the overflow pipe away from the mixing tank extends into the container near the bottom.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In this concrete production admixture feeding device, after compressed air is introduced into the first and second air inlets, the admixture raw materials first form a gas-liquid two-phase fluid in the first air inlet. Then, multiple streams of gas-liquid two-phase fluids containing different admixture raw materials enter the mixing tank. Under the action of the airflow injected into the second air inlet, these fluids are further transformed into a lower density gas-liquid two-phase fluid in the guide tube. During this process, when the gas-liquid two-phase fluid rises in the guide tube, it will flow through narrow channels and filter holes one after another, breaking the air bubbles into more tiny air bubbles. A large number of tiny air bubbles generate violent turbulence during the upward movement, thereby promoting the full mixing of various raw materials, making the admixture mixture more uniform, and improving the quality of the prepared concrete admixture.

[0018] 2. The concrete production admixture feeding device uses compressed air as the power source for conveying and mixing, which greatly reduces the contact area between the device and the admixture raw materials. Therefore, the admixture raw materials experience less resistance when flowing, the amount of admixture raw materials remaining on the contact surface of the device is low, and no liquid adsorption phenomenon occurs on the contact surface, ensuring the accuracy of the proportion of each raw material of the admixture. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the feeding assembly of this utility model;

[0021] Figure 3 This is a cross-sectional view of the feeding assembly of this utility model;

[0022] Figure 4 This is a partial structural schematic diagram of the present invention;

[0023] Figure 5 For the present utility model Figure 4 A sectional view;

[0024] Figure 6 This is a partial structural diagram of the mixing component of this utility model.

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1. Feeding assembly; 11. Mixing tank; 12. Discharge pipe; 13. Electromagnetic flow meter; 14. First air inlet pipe; 15. Flow regulating valve;

[0027] 2. Mixing assembly; 21. Mixing tank; 22. Feed pipe; 23. Second air inlet pipe; 24. Overflow pipe; 25. Guide tube; 251. Inlet; 26. Spiral guide plate; 27. Mesh plate;

[0028] 3. Water scale assembly; 31. Electronic scale; 32. Container; 33. Conveying pipe. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] Please see Figures 1-3 As shown, the purpose of this embodiment is to provide a concrete admixture feeding device, including a feeding component 1, which includes a mixing tank 11. When using this device, 3-5 identical feeding components 1 are required, i.e., 3-5 mixing tanks 11 are set up. One mixing tank 11 stores the water-reducing mother liquor with the largest usage, and another mixing tank 11 stores the retarding and slump-preserving mother liquor with a high usage frequency. These two mother liquors are the main raw materials of concrete admixtures. The other mixing tanks 11 store various functional admixture raw materials such as air-entraining, defoaming, and rust-inhibiting agents. If the admixture raw material is solid, it needs to be prepared into a solution with a mass fraction of 10%. For raw materials with very low usage, such as air-entraining and defoaming agents, they need to be diluted to one-tenth of the original concentration in the mixing tank 11 to reduce the impact of measurement error.

[0032] To prepare the additive raw material solution, a stirring shaft is coaxially mounted inside the stirring tank 11. Several stirring blades are fixedly mounted on the circumferential side wall of the stirring shaft. A motor is fixedly mounted on the upper side wall of the stirring tank 11. The lower end of the motor's output shaft rotates through the top of the stirring tank 11 and is coaxially fixedly connected to the stirring shaft via a coupling. Two feeding pipes are fixedly mounted on the top of the stirring tank 11. After the solid additive raw material and solvent are injected into the stirring tank 11 in a predetermined ratio through the feeding pipes, the motor is started, and its output shaft drives the stirring shaft and stirring blades to rotate. This allows the stirring blades to stir and mix the additive raw material inside the stirring tank 11 to prepare an additive raw material solution of a predetermined concentration. At the same time, continuous stirring can prevent the liquid in the tank from separating and ensure that the concentration of the raw materials is uniform.

[0033] In order to access the additive raw materials inside the mixing tank 11, a discharge pipe 12 is fixedly installed on one side of the mixing tank 11 near the bottom. An electromagnetic flow meter 13 and a flow regulating valve 15 are fixedly installed at one end of the discharge pipe 12. The output end of the electromagnetic flow meter 13 is fixed and connected to the inlet pipe of the flow regulating valve 15. The electromagnetic flow meter 13 and the flow regulating valve 15 are electrically connected. The flow regulating valve 15 has a one-way valve function, which only allows the additive raw materials inside the mixing tank 11 to be discharged through the discharge pipe 12.

[0034] A first air inlet pipe 14 is fixedly installed on the outlet pipe of the flow regulating valve 15. The first air inlet pipe 14 and the outlet pipe of the flow regulating valve 15 form a three-way pipe structure. One end of the first air inlet pipe 14 is connected to compressed air. After the compressed air is injected into the first air inlet pipe 14, the airflow flows at high speed, which reduces the internal pressure. At this time, the flow regulating valve 15 is opened, so that the additive raw material in the mixing tank 11 can flow into the first air inlet pipe 14 through the discharge pipe 12 under the action of negative pressure. After the additive raw material is mixed with the airflow, a gas-liquid two-phase flow state of the additive raw material is formed in the first air inlet pipe 14. Most of the air is mixed in the additive raw material in the form of bubbles.

[0035] The admixture material flowing through the discharge pipe 12 will pass through the electromagnetic flow meter 13. The electromagnetic flow meter 13 calculates the flow rate of the admixture material and precisely controls the fluid flow rate by linking with the flow regulating valve 15. The electromagnetic flow meter 13 is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity, and has high measurement accuracy. The principle of the electromagnetic flow meter 13 controlling the flow regulating valve 15 is existing technology, so it will not be described in detail here.

[0036] To mix various admixture raw materials to formulate a concrete admixture with a predetermined function, a mixing component 2 is provided on one side of the feeding component 1. The structure of the mixing component 2 is detailed below, referring to... Figures 4-6The mixing assembly 2 includes a mixing tank 21. Several feed pipes 22 are vertically arrayed and fixedly arranged on the lower middle part of the circumferential side wall of the mixing tank 21. The number of feed pipes 22 is the same as the number of mixing tanks 11 used. If there are unused feed pipes 22, they are sealed by a sealing plate. The end of the first air inlet pipe 14 is fixedly connected to one of the feed pipes 22 through a flange, so that each first air inlet pipe 14 is fixedly connected to the corresponding feed pipe 22, thereby ensuring that the gas-liquid two-phase flow additive raw materials inside the first air inlet pipe 14 can flow into the mixing tank 21.

[0037] Furthermore, a pneumatic mixing mechanism is provided inside the mixing tank 21. When the first air inlet pipe 14 transports the additive raw material in a gas-liquid two-phase flow state into the mixing tank 21 through the feed pipe 22, the pneumatic mixing mechanism performs pneumatic stirring and mixing of the additive raw material. The structure of the pneumatic mixing mechanism is detailed below. The pneumatic mixing mechanism includes a guide tube 25 coaxially fixed inside the mixing tank 21 by a bracket. The guide tube 25 is an hourglass-shaped structure that is thick at both ends and thin in the middle. A narrow channel is formed in the middle of its interior. A perforated plate 27 is fixedly installed at the upper end of the guide tube 25. The perforated plate 27 is provided with several filter holes. An overflow pipe 24 is fixedly installed on the circumferential side wall of the mixing tank 21 above the perforated plate 27. The overflow pipe 24 is connected to the interior of the mixing tank 21.

[0038] The pneumatic mixing mechanism also includes a second air inlet pipe 23 fixedly installed on the circumferential side wall of the mixing tank 21 near the bottom. The second air inlet pipe 23 is also connected to compressed air. One end of the second air inlet pipe 23 passes through the side wall of the mixing tank 21 and is fixedly installed at the bottom center of the guide cylinder 25. The second air inlet pipe 23 is connected to the inside of the guide cylinder 25. Several feed ports 251 are arranged in a ring array near the bottom of the circumferential side wall of the guide cylinder 25. The feed ports 251 are located below the feed pipe 22. The pneumatic mixing mechanism also includes a spiral guide plate 26 fixedly installed on the inner circumferential wall of the mixing tank 21. The guide cylinder 25 is installed inside the spiral guide plate 26, and there is a gap between the two. The lower end of the spiral guide plate 26 extends to a position corresponding to the height of the feed port 251. The connection between the feed pipe 22 and the mixing tank 21 is located in the spiral gap of the spiral guide plate 26.

[0039] When the gas-liquid two-phase flow additive raw material enters the mixing tank 21, the additive raw material flows downward under the action of gravity. Under the guidance of the spiral guide plate 26, it spirals downward along the inner wall of the mixing tank 21 to the vicinity of the feed port 251. At the same time, compressed air flows into the guide cylinder 25 through the second air inlet pipe 23. The airflow flows from bottom to top at high speed in the guide cylinder 25 to form a negative pressure. Affected by this negative pressure, the additive raw material is drawn into the guide cylinder 25 through the feed port 251 and mixes with the airflow to form a gas-liquid two-phase fluid with a lower density.

[0040] In this process, the airflow plays the role of the core mixing medium. The gas-liquid mixture forms an upward flow inside the guide tube 25. When it passes through the narrow channel inside the guide tube 25, it is violently accelerated, generating super shear force. This powerful shear force not only breaks up the bubbles in the fluid, making their particle size smaller and their number more, but more importantly, it powerfully tears, cuts and disperses the droplets or particles of different kinds of additive raw materials, breaking their possible agglomeration or stratification, forcing them to permeate and intertwine with each other. At the same time, the high-speed airflow and the large number of tiny bubbles generated after breaking up trigger violent turbulence in the upward motion. This turbulence greatly enhances the irregular motion of the fluid, significantly increases the collision frequency and contact area between molecules or micro-clusters of different raw material components, and promotes their uniform mixing through turbulent diffusion. The filter holes of the mesh plate 27 further squeeze and break up the bubbles, which also intensifies this micro-scale stirring.

[0041] After passing through a narrow channel, the fluid enters a wider channel, where the flow rate slows down and the pressure increases. This deceleration and pressurization process effectively prolongs the residence time of the gas-liquid mixture (i.e., the fluid containing multiple additive raw materials), providing conditions for different raw material components to achieve a more uniform distribution through molecular diffusion in a relatively stable environment. As the bubbles rise, they continuously break and renew their surfaces, which also drives the movement of the surrounding fluid and interface renewal, further enhancing the mixing. The gas-liquid two-phase fluid continues to rise and is discharged through the filter holes of the perforated plate 27. During this process, the filter holes further squeeze and break the bubbles in the fluid, working in conjunction with the above mechanism to promote the full mixing of the additive raw materials with the gas and the full mixing of multiple raw materials.

[0042] When the gas-liquid two-phase fluid rises to the connection point with the overflow pipe 24 and the mixing tank 21 (i.e., the liquid level inside the mixing tank 21), a turbulent phenomenon occurs. This intense surface disturbance further enhances the turbulent mixing effect, allowing the additive raw material to be further mixed with the gas and different raw material components, thus improving the mixing quality. The additive raw material at the top layer is discharged from the mixing tank 21 through the overflow pipe 24.

[0043] Additive materials that do not enter the overflow pipe 24 are drawn down to the bottom of the mixing tank 21 by the downward spiraling fluid, and are then drawn back into the guide tube 25, forming a circulating flow. This circulation process ensures that the material is repeatedly processed, effectively overcoming the problem of uneven local mixing, and significantly improving the efficiency and uniformity of mixing multiple additive materials by the mixing component 2.

[0044] To accurately measure the predetermined amount of concrete admixture, a water scale assembly 3 is installed on one side of the mixing assembly 2. The water scale assembly 3 includes an electronic scale 31. A container 32 with its opening facing upwards is placed on the upper side wall of the electronic scale 31. The container 32 is filled with a predetermined amount of water. A conveying pipe 33 is fixedly installed on the circumferential side wall of the container 32 near the bottom. The conveying pipe 33 is connected to the feed pipe of an external mixer. An overflow pipe 24 extends from the mixing tank 21 to the bottom of the container 32. The end of the overflow pipe 24 is located in the container 3. Below the liquid surface inside container 2, when the overflow pipe 24 delivers the mixed additive and accompanying high-pressure airflow into the container 32, the additive and water are fully mixed under the action of air pressure: the high-pressure airflow injects into the water body to generate violent turbulence and forces the additive particles to diffuse in the water. At the same time, the outlet of the overflow pipe 24 is located below the liquid surface, ensuring that the additive is directly sent into the water rather than floating on the water surface. During the process of the bubbles rising, they are continuously disturbed, thereby achieving rapid and uniform dissolution and dispersion, further ensuring the uniformity of the mixing of the several raw materials of the additive.

[0045] The mixed admixture solution is then transported through the delivery pipe 33 into the mixer to be mixed with the concrete to improve the performance of the concrete.

[0046] This device uses air as the power source for conveying and mixing, offering significant advantages: First, compared to mechanical mixing, it drastically reduces the surface area of ​​the container wall (i.e., the contact surface between the device and the admixture raw materials), and the fluid experiences minimal resistance from the container wall, resulting in virtually no residue. Second, due to the high viscosity of the main admixture raw materials, relying on gravity or water pumps for transport would cause liquid adsorption on the container wall, affecting the accuracy of the raw material ratios. Although high-pressure water washing can remove residues, it increases water consumption and interferes with water metering. Third, excessive washing water can lead to excessive water usage in the concrete, thereby reducing product strength. However, by using air as the primary power source, the airflow ensures almost no liquid adsorption on the container wall, thus guaranteeing the accuracy of the admixture raw material ratios.

[0047] After using this device, the proportion of admixture raw materials can be flexibly adjusted according to different concrete needs. For example, the slump retention component can be optimized according to the transportation time, and the setting time can be adjusted according to temperature changes. Even if the raw materials fluctuate, the admixture formula can respond and adjust quickly to ensure that its function is accurately performed, which not only meets the performance requirements but also avoids the waste of raw materials. This not only improves the product quality of concrete companies but also reduces production costs. In the fierce market competition, this significantly enhances the core competitiveness of enterprises.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A concrete admixture feeding device, comprising a feeding assembly (1), wherein a mixing assembly (2) is provided on one side of the feeding assembly (1), characterized in that: The feeding assembly (1) includes a mixing tank (11). A discharge pipe (12) is fixedly installed on one side of the mixing tank (11) near the bottom. An electromagnetic flow meter (13) and a flow regulating valve (15) are fixedly installed at one end of the discharge pipe (12). A first air inlet pipe (14) is fixedly installed on the water outlet pipe of the flow regulating valve (15). The first air inlet pipe (14) and the water outlet pipe of the flow regulating valve (15) form a three-way pipe structure. The mixing assembly (2) includes a mixing... The mixing tank (21) has several feed pipes (22) fixedly arranged in a vertical array on the lower middle part of the circumferential side wall. The end of the first air inlet pipe (14) is fixedly connected to one of the feed pipes (22) through a flange. The mixing tank (21) is equipped with a pneumatic mixing mechanism. When the first air inlet pipe (14) transports the additive raw material in a gas-liquid two-phase flow state to the mixing tank (21) through the feed pipe (22), the pneumatic mixing mechanism performs pneumatic stirring and mixing of the additive raw material.

2. The admixture feeding device for concrete production according to claim 1, characterized in that: The pneumatic mixing mechanism includes a guide tube (25) coaxially fixed inside the mixing tank (21) by a bracket. A mesh plate (27) is fixedly provided at the upper end of the guide tube (25). The mesh plate (27) is provided with a number of filter holes. An overflow pipe (24) is fixedly provided on the circumferential side wall of the mixing tank (21) above the mesh plate (27). The overflow pipe (24) is connected to the interior of the mixing tank (21).

3. The admixture feeding device for concrete production according to claim 2, characterized in that: The pneumatic mixing mechanism also includes a second air inlet pipe (23) located near the bottom of the mixing tank (21). One end of the second air inlet pipe (23) passes through the side wall of the mixing tank (21) and extends to the bottom center of the guide tube (25). The second air inlet pipe (23) is connected to the interior of the guide tube (25).

4. The admixture feeding device for concrete production according to claim 2, characterized in that: The guide tube (25) has several inlets (251) arranged in a ring array near the bottom of its circumferential sidewall. The inlets (251) are located below the feed pipe (22).

5. The admixture feeding device for concrete production according to claim 4, characterized in that: The pneumatic mixing mechanism also includes a spiral guide plate (26) fixedly installed on the inner circumference of the mixing tank (21). The lower end of the spiral guide plate (26) extends to a position corresponding to the height of the feed inlet (251). The connection between the feed pipe (22) and the mixing tank (21) is located in the spiral gap of the spiral guide plate (26).

6. The admixture feeding device for concrete production according to claim 2, characterized in that: The guide tube (25) is an hourglass-shaped structure that is thick at both ends and thin in the middle, and the guide tube (25) is located inside the spiral guide plate (26).

7. The admixture feeding device for concrete production according to claim 2, characterized in that: A water scale assembly (3) is provided on one side of the mixing assembly (2). The water scale assembly (3) includes an electronic scale (31). A container (32) with its opening facing upward is placed on the upper side wall of the electronic scale (31). A conveying pipe (33) is fixedly provided on the circumferential side wall of the container (32) near the bottom.

8. The admixture feeding device for concrete production according to claim 7, characterized in that: The overflow pipe (24) extends from the end away from the mixing tank (21) into the interior of the container (32) near the bottom.

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