Layered slag breaking and stirring system

Abstract

The utility model relates to wastewater treatment technical field provides a layered formula broken slag stirring system, include: stirring tank, drive module and stirring module, drive module includes drive assembly and vertical stirring shaft, stirring module includes upper layer stirring assembly, middle layer stirring assembly and lower layer stirring assembly, upper layer stirring assembly includes at least one upper layer stirring device, middle layer stirring assembly includes at least one middle layer stirring device, lower layer stirring assembly includes at least one lower layer stirring device, and upper layer stirring device, middle layer stirring device and lower layer stirring device all are located in vertical stirring shaft. The layered formula broken slag stirring system provided by the utility model can realize low speed (such as less than or equal to 15rpm) layered stirring through the upper layer stirring assembly, the middle layer stirring assembly and the lower layer stirring assembly, ensures uniform mixing of materials during the stirring process, prevents fiber materials from forming shells or depositing, improves the efficiency and stability of the stirring system, and effectively reduces the system energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a layered slag breaking and stirring system. Background Technology

[0002] Existing anaerobic digesters mostly employ high-speed mechanical stirring or paddle stirring, which suffers from problems such as high energy consumption, uneven solid-liquid phase distribution, crusting, and sedimentation. The limitations of traditional stirring devices are particularly pronounced when processing fibrous materials. High-speed mechanical stirring (≥30 rpm) not only consumes a lot of energy but can also lead to wear on the stirring blades, affecting fermentation efficiency. Furthermore, fibrous materials are prone to producing scum and sediment, increasing the frequency of equipment maintenance and operating costs. Utility Model Content

[0003] This invention provides a layered slag breaking and stirring system to solve the defects of existing technologies that mainly rely on high-speed mechanical stirring, resulting in high energy consumption and uneven solid-liquid distribution.

[0004] This utility model provides a layered slag breaking and stirring system, including: a stirring tank, a drive module and a stirring module.

[0005] The drive module includes a drive assembly and a vertical stirring shaft. The output end of the drive assembly is connected to the vertical stirring shaft, and at least a portion of the vertical stirring shaft is located inside the mixing tank. The stirring module includes an upper stirring assembly, a middle stirring assembly, and a lower stirring assembly. The upper stirring assembly includes at least one upper stirring device for stirring the upper layer material in the mixing tank. The middle stirring assembly includes at least one middle stirring device for stirring the middle layer material in the mixing tank. The lower stirring assembly includes at least one lower stirring device for stirring the lower layer material in the mixing tank. The upper stirring device, the middle stirring device, and the lower stirring device are all located on the vertical stirring shaft.

[0006] According to the layered slag breaking and stirring system provided by this utility model, the stirring module further includes a shell breaking and stirring device for breaking the upper layer material. The shell breaking and stirring device is disposed on the vertical stirring shaft and located above the upper stirring assembly.

[0007] According to the layered slag breaking and stirring system provided by this utility model, the shell breaking and stirring device includes an installation rod and a plurality of shell breaking teeth. The installation rod is vertically connected to the vertical stirring shaft. Along the length direction of the installation rod, the plurality of shell breaking teeth are spaced apart and vertically connected to the bottom of the installation rod.

[0008] According to the layered slag breaking and stirring system provided by this utility model, the length of the shell breaking teeth gradually decreases along the radial outward direction of the stirring tank, and the spacing between adjacent shell breaking teeth gradually increases.

[0009] According to the layered slag breaking and stirring system provided by this utility model, the slag breaking teeth include a receiving part and a backing part connected to each other. The angle between the receiving part and the cross-section of the mounting rod is 8° to 12°, and the angle between the backing part and the cross-section of the mounting rod is 4° to 6°.

[0010] According to the layered slag breaking and mixing system provided by this utility model, the included angle between the material receiving part and the cross-section of the mounting rod is 10°, and the included angle between the material backing part and the cross-section of the mounting rod is 5°.

[0011] The layered slag breaking and stirring system provided by this utility model further includes: a middle layer flow barrier component and a lower layer flow barrier component.

[0012] The middle-layer baffle assembly includes multiple middle-layer baffles, which are circumferentially spaced on the inner wall of the mixing tank; the lower-layer baffle assembly includes multiple lower-layer baffles, which are circumferentially spaced on the inner wall of the mixing tank.

[0013] According to the layered slag breaking and stirring system provided by this utility model, the middle layer baffle is perpendicular to the inner wall of the stirring tank; and / or, the lower layer baffle is perpendicular to the inner wall of the stirring tank.

[0014] According to the layered slag breaking and stirring system provided by this utility model, the driving component includes a motor, a reducer and a coupling. The output shaft of the motor is connected to the input end of the reducer, the output end of the reducer is connected to the coupling, and the coupling is connected to the vertical stirring shaft.

[0015] The layered slag breaking and mixing system provided by this utility model further includes: a frame, the frame being disposed on the mixing tank, and the motor and the reducer being disposed on the frame.

[0016] The layered slag breaking and mixing system provided by this utility model can achieve low-speed (e.g., ≤15rpm) layered mixing by setting up an upper layer mixing component, a middle layer mixing component and a lower layer mixing component. This ensures uniform mixing of materials during the mixing process, prevents fibrous materials from forming shells or depositing, improves the efficiency and stability of the mixing system, and can effectively reduce system energy consumption.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the layered slag breaking and stirring system provided in this embodiment of the utility model.

[0020] Figure 2 This is a schematic diagram of the shell-breaking stirring device in the layered slag-breaking stirring system provided in this utility model embodiment.

[0021] Figure 3 This is a schematic diagram of the angle between the shell-breaking teeth and the mounting rod in the layered slag-breaking and stirring system provided in this embodiment of the utility model.

[0022] Figure 4 This is a schematic diagram of the drive module in the layered slag breaking and stirring system provided in this embodiment of the utility model.

[0023] Figure label: 100. Mixing tank; 200. Drive module; 210. Drive assembly; 211. Motor; 212. Reducer; 213. Coupling; 220. Vertical mixing shaft; 300. Mixing module; 310. Upper mixing assembly; 311. Upper mixing device; 320. Middle mixing assembly; 321. Middle mixing device; 330. Lower mixing assembly; 331. Lower mixing device; 340. Shell-breaking mixing device; 341. Mounting rod; 342. Shell-breaking toothed blade; 342a. Feeding section; 342b. Backing section; 400. Middle baffle assembly; 410. Middle baffle plate; 500. Lower baffle assembly; 510. Lower baffle plate; 600. Frame. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0027] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] The following is combined Figures 1 to 4 This invention describes the layered slag breaking and mixing system provided by this utility model.

[0030] See Figure 1 As shown, the layered slag breaking and stirring system provided in this embodiment of the present invention includes: a stirring tank 100, a drive module 200 and a stirring module 300.

[0031] The drive module 200 includes a drive assembly 210 and a vertical stirring shaft 220. The output end of the drive assembly 210 is connected to the vertical stirring shaft 220, and at least a portion of the vertical stirring shaft 220 is located inside the mixing tank 100. The stirring module 300 includes an upper stirring assembly 310, a middle stirring assembly 320, and a lower stirring assembly 330. The upper stirring assembly 310 includes at least one upper stirring device 311 for stirring the upper layer material in the mixing tank 100. The middle stirring assembly 320 includes at least one middle stirring device 321 for stirring the middle layer material in the mixing tank 100. The lower stirring assembly 330 includes at least one lower stirring device 331 for stirring the lower layer material in the mixing tank 100. The upper stirring device 311, the middle stirring device 321, and the lower stirring device 331 are all located on the vertical stirring shaft 220.

[0032] The layered slag breaking and mixing system provided by this utility model, by setting up an upper mixing component 310, a middle mixing component 320 and a lower mixing component 330, can achieve low-speed (e.g., ≤15rpm) layered mixing, ensuring uniform mixing of materials during the mixing process, preventing fibrous materials from forming shells or depositing, improving the efficiency and stability of the mixing system, and effectively reducing system energy consumption. It is suitable for processing wet materials such as manure and straw (TS=3% to 15%, particle size ≤5cm).

[0033] Specifically, the mixing tank 100 is used for fibrous organic waste to be treated, and it is equipped with an inlet and an outlet.

[0034] The drive module 200 is used to simultaneously output low-speed rotational power to the upper mixing device 311, the middle mixing device 321, and the lower mixing device 331 via the vertical stirring shaft 220. The drive module 200 includes a drive assembly 210 and a vertical stirring shaft 220. The drive assembly 210 provides power to rotate the vertical stirring shaft 220 at a set speed, and the vertical stirring shaft 220 transmits power to the mixing devices at each level.

[0035] The mixing module 300 is used to mix materials at different depths within the mixing tank 100 through the upper mixing component 310, the middle mixing component 320, and the lower mixing component 330, respectively, to ensure uniform mixing of the materials during the mixing process and prevent fibrous materials from forming crusts or depositing. Each of the upper mixing component 310, the middle mixing component 320, and the lower mixing component 330 includes at least one mixing device.

[0036] It should be noted that the number of agitators in the upper agitator 310, the middle agitator 320 and the lower agitator 330 can be the same or different, and there is no special limitation on this. The agitators in the upper agitator 310, the middle agitator 320 and the lower agitator 330 can be increased or decreased according to the properties of the material being agitated (such as material concentration, fiber content or particle size distribution).

[0037] See Figure 1 As shown in the figure, as an example, in this embodiment, the upper stirring assembly 310, the middle stirring assembly 320 and the lower stirring assembly 330 each include a single stirring device.

[0038] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the mixing module 300 further includes a shell-breaking mixing device 340 for breaking the upper layer material. The shell-breaking mixing device 340 is disposed on the vertical mixing shaft 220 and located above the upper mixing assembly 310.

[0039] By setting up the shell-breaking agitator 340, an independent crushing zone can be formed above the upper agitator 310 to pre-cut and break up the scum and hard shell, reduce the load on the subsequent blades, and keep the overall low-speed flow field continuous and smooth.

[0040] Specifically, a set of horizontal short paddles (mounting rods 341) can be coaxially fixed at the top of the vertical stirring shaft 220. The short paddles have serrated or oblique edges on their outer edges and are slightly below the liquid surface. When the shaft rotates at low speed, the short paddles circumferentially cut the scum film that is formed first, breaking its continuous tension. Then, the upper stirring assembly 310 pushes the loosened scum downwards, merging it with the middle and lower flow fields to complete the subsequent mixing.

[0041] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the shell-breaking stirring device 340 includes a mounting rod 341 and a plurality of shell-breaking teeth 342. The mounting rod 341 is vertically connected to the vertical stirring shaft 220. Along the length direction of the mounting rod 341, the plurality of shell-breaking teeth 342 are spaced apart and vertically connected to the bottom of the mounting rod 341.

[0042] By setting the shell-breaking stirring device 340 to a structure of "horizontal mounting rod 341 + drooping toothed blades", the toothed blades can be vertically inserted into the scum layer. When rotating at low speed, they can linearly cut and locally pry up the hard shell, preventing the entire piece of scum from sliding along with the paddle. The spaced distribution of the toothed blades allows the cutting force to be released in segments, reducing instantaneous torque fluctuations. At the same time, the mounting rod 341 and the vertical stirring shaft 220 form a T-shaped rigid frame, ensuring that the toothed blades are always at a fixed immersion depth, maintaining a stable shell-breaking effect.

[0043] Specifically, the shell-breaking and stirring device 340 includes at least one mounting rod 341, and when the shell-breaking and stirring device 340 includes multiple mounting rods 341, the multiple mounting rods 341 are circumferentially spaced on the vertical stirring shaft 220, which can improve the efficiency and effect of material crushing.

[0044] As an example, in this embodiment, the shell-breaking stirring device 340 includes two mounting rods 341, which are arranged at 180° to the vertical stirring shaft 220.

[0045] See Figure 2 As shown, according to some embodiments of the present invention, the length of the shell-breaking teeth 342 gradually decreases in the radial outward direction along the mixing tank 100, and the spacing between adjacent shell-breaking teeth 342 gradually increases.

[0046] By adopting an asymmetrical arrangement of "dense inside and sparse outside" along the radial direction of the shell-breaking teeth 342—with high tooth density in the central area and low tooth density in the outer peripheral area—sufficient cutting frequency is obtained in the central area with a lower linear speed, while the outer peripheral area has a higher linear speed but fewer teeth, thus avoiding the scum from being pushed outward and accumulating, and maintaining balanced shell breaking and low torque fluctuation under low-speed rotation.

[0047] As an example, in this embodiment, the length of the shell-breaking toothed blade 342 near the vertical stirring shaft 220 is greater than 3 times its width, and the length of the shell-breaking toothed blade 342 at the edge is greater than 1.5 times its width.

[0048] See Figure 3 As shown, according to some embodiments of the present invention, the shell-breaking toothed blade 342 includes a receiving part 342a and a backing part 342b connected to each other. The angle between the receiving part 342a and the cross section of the mounting rod 341 (as shown by ∠α in the figure) is 8° to 12°, and the angle between the backing part 342b and the cross section of the mounting rod 341 (as shown by ∠β in the figure) is 4° to 6°.

[0049] By setting the angle between the cross-section of the receiving part 342a and the mounting rod 341 to 8° to 12°, a sharp wedge-shaped cutting edge is formed at the front end of the toothed blade. When the scum comes into contact, it is first "wedged" into the cutting edge, generating local tension concentration, and then torn along the inclined surface, preventing the straw fibers from slipping off as a whole. This allows for continuous and efficient layered crushing at low speeds. At the same time, by setting the angle between the backing part 342b and the cross-section of the mounting rod 341 to 4° to 6°, a slightly inclined guiding slope is formed on the back of the toothed blade. This reduces the eddy current resistance during exit and guides the torn fragments to the lower impeller area, preventing the residue from entangled again on the back of the tooth and maintaining stable and continuous low-speed operation.

[0050] As an example, the angle between the receiving part 342a and the cross-section of the mounting rod 341 can be 8°, 10° or 12°, preferably 10°, and the angle between the backing part 342b and the cross-section of the mounting rod 341 can be 4°, 5° or 6°, preferably 5°.

[0051] According to some embodiments of the present invention, the angle between the receiving part 342a and the cross-section of the mounting rod 341 is 10°, and the angle between the backing part 342b and the cross-section of the mounting rod 341 is 5°.

[0052] See Figure 1 As shown, according to some embodiments of the present invention, the layered slag breaking and stirring system further includes: a middle layer baffle assembly 400 and a lower layer baffle assembly 500; the middle layer baffle assembly 400 includes a plurality of middle layer baffle plates 410, which are circumferentially spaced on the inner wall of the stirring tank 100; the lower layer baffle assembly 500 includes a plurality of lower layer baffle plates 510, which are circumferentially spaced on the inner wall of the stirring tank 100.

[0053] By incorporating the middle-layer baffle assembly 400 and the lower-layer baffle assembly 500, the fluid flow state can be improved, transforming it from inefficient circumferential flow to efficient axial and radial flow. This enhances mixing uniformity, reduces dead zones, and aids heat transfer. The goal is to create a more stable and uniform growth environment for microorganisms, ultimately leading to higher fermentation efficiency and quality.

[0054] Specifically, the rotation of the agitator causes the liquid to move in a circular motion (primary flow), which easily forms a central vortex, leading to uneven mixing and affecting the tank structure. Baffles can impede simple circular flow, promoting axial and radial flow (secondary flow). The middle baffle 410 and the lower baffle 510 are fixed to the tank wall circumferentially, at corresponding heights of the middle and lower impellers, respectively. When the agitator rotates at low speed, the baffles cut off the primary circular flow, forming a forced reversal zone behind the baffles. This converts tangential kinetic energy into axial and radial kinetic energy, causing the material to tumble and exchange radially, thereby weakening the central vortex, eliminating dead zones, and enhancing uniform contact and heat transfer between the solid, liquid, and microorganisms.

[0055] It should be noted that the number of baffles in the middle layer baffle assembly 400 and the lower layer baffle assembly 500 can be the same or different, and there is no special limitation on this. They can be flexibly set according to the viscosity, solid content and blade type of the corresponding liquid level zone.

[0056] As an example, in this embodiment, both the middle layer baffle assembly 400 and the lower layer baffle assembly 500 include four baffles, and the four baffles are evenly distributed circumferentially.

[0057] See Figure 1As shown, according to some embodiments of the present invention, the middle baffle plate 410 is perpendicular to the inner wall of the mixing tank 100; the lower baffle plate 510 is perpendicular to the inner wall of the mixing tank 100.

[0058] By installing the middle baffle 410 and the lower baffle 510 perpendicular to the inner wall of the tank, with the plate surface facing the tangential flow, the maximum flow obstruction area can be obtained under the minimum plate width condition, forcing the circumferential flow to turn instantly, strengthening the axial and radial secondary flow, and avoiding solid material accumulation and cleaning dead corners caused by the inclined plate.

[0059] See Figure 4 As shown, according to some embodiments of the present invention, the drive assembly 210 includes a motor 211, a reducer 212 and a coupling 213. The output shaft of the motor 211 is connected to the input end of the reducer 212, the output end of the reducer 212 is connected to the coupling 213, and the coupling 213 is connected to the vertical stirring shaft 220.

[0060] By using the structure of the drive assembly 210, which includes a motor 211, a reducer 212, and a coupling 213, the motor 211 provides power, the reducer 212 reduces the speed to ≤15rpm and amplifies the torque, and the coupling 213 compensates for shaft alignment errors, a smooth, low-noise vertical low-speed drive is achieved, which meets the requirements of stratified mixing for high torque, low speed, and long-term continuous operation.

[0061] See Figure 1 As shown, according to some embodiments of the present invention, the layered slag breaking and mixing system further includes: a frame 600, which is disposed in the mixing tank 100, and a motor 211 and a reducer 212 are both disposed in the frame 600.

[0062] By setting up the frame 600, the motor 211 and the reducer 212 are fixed as a whole to the top of the mixing tank 100, forming a rigid support platform. This ensures the coaxiality of the output shaft of the reducer 212 and the vertical mixing shaft 220, avoids relative displacement caused by reaction torque during operation, and facilitates overall hoisting and maintenance.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A layered slag-breaking and mixing system, characterized in that, include: Mixing tank; A drive module, comprising a drive assembly and a vertical stirring shaft, wherein the output end of the drive assembly is connected to the vertical stirring shaft, and at least a portion of the vertical stirring shaft is located inside the mixing tank; A mixing module, comprising an upper mixing assembly, a middle mixing assembly, and a lower mixing assembly, wherein the upper mixing assembly includes at least one upper mixing device for mixing the upper layer material in the mixing tank, the middle mixing assembly includes at least one middle mixing device for mixing the middle layer material in the mixing tank, and the lower mixing assembly includes at least one lower mixing device for mixing the lower layer material in the mixing tank, wherein the upper mixing device, the middle mixing device, and the lower mixing device are all disposed on the vertical mixing shaft.

2. The layered slag-breaking and mixing system according to claim 1, characterized in that, The mixing module also includes a shell-breaking mixing device for crushing the upper layer material. The shell-breaking mixing device is located on the vertical mixing shaft and above the upper mixing assembly.

3. The layered slag-breaking and mixing system according to claim 2, characterized in that, The shell-breaking stirring device includes a mounting rod and multiple shell-breaking teeth. The mounting rod is vertically connected to the vertical stirring shaft. Along the length of the mounting rod, the multiple shell-breaking teeth are spaced apart and vertically connected to the bottom of the mounting rod.

4. The layered slag-breaking and mixing system according to claim 3, characterized in that, Along the radial outward direction of the mixing tank, the length of the shell-breaking teeth gradually decreases, and the spacing between adjacent shell-breaking teeth gradually increases.

5. The layered slag-breaking and mixing system according to claim 3, characterized in that, The shell-breaking toothed blade includes a receiving part and a backing part connected to each other. The angle between the receiving part and the cross-section of the mounting rod is 8° to 12°, and the angle between the backing part and the cross-section of the mounting rod is 4° to 6°.

6. The layered slag-breaking and mixing system according to claim 5, characterized in that, The angle between the receiving part and the cross-section of the mounting rod is 10°, and the angle between the backing part and the cross-section of the mounting rod is 5°.

7. The layered slag-breaking and mixing system according to any one of claims 1 to 6, characterized in that, Also includes: A middle-layer baffle assembly, comprising a plurality of middle-layer baffle plates, wherein the plurality of middle-layer baffle plates are circumferentially spaced on the inner wall of the mixing tank; The lower baffle assembly includes multiple lower baffle plates, which are circumferentially spaced on the inner wall of the mixing tank.

8. The layered slag-breaking and mixing system according to claim 7, characterized in that, The middle baffle is perpendicular to the inner wall of the mixing tank; and / or, the lower baffle is perpendicular to the inner wall of the mixing tank.

9. The layered slag-breaking and mixing system according to any one of claims 1 to 6, characterized in that, The drive assembly includes a motor, a reducer, and a coupling. The output shaft of the motor is connected to the input end of the reducer, the output end of the reducer is connected to the coupling, and the coupling is connected to the vertical stirring shaft.

10. The layered slag-breaking and stirring system according to claim 9, characterized in that, Also includes: The frame is located on the mixing tank, and the motor and the reducer are both located on the frame.

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