A self-cleaning concrete mixing device

Abstract

The utility model discloses a self -cleaning's concrete mixing device, including the mixing bucket and the support of connecting in the bottom of mixing bucket, the bottom central connection of mixing bucket has frequency conversion motor, and the top and bottom of mixing bucket are equipped with feed port, discharge gate respectively, and be equipped with the stirring shaft and the spiral stirring vane of fixedly connected on the stirring shaft in the mixing bucket, and the top fixedly connected of stirring shaft has gear ; The central part of mixing bucket top still is equipped with pressure water storage and links to each other with the hollow sleeve of pressure water storage, and the bottom central fixedly connected of hollow sleeve has the inner tooth ring, and is matched with gear, the both sides of hollow sleeve all are connected with the scraper, and the edge of the both sides of scraper is close to the stirring shaft, and evenly is equipped with a plurality of water nozzle. The design utilizes the pressure water storage of setting up above the mixing bucket, and links to each other with the plurality of water nozzles of setting up on the edge of scraper, can wash the concrete residue sticking on the scraper, to realize the more thorough cleaning to concrete mixing device.

Description

Technical Field

[0001] This utility model relates to the field of concrete equipment technology, and in particular to a self-cleaning concrete mixing device. Background Technology

[0002] Concrete mixing plants require regular and thorough cleaning, which directly affects the normal operation of the equipment, production efficiency, concrete quality, as well as safety and cost. Hardened concrete adhering to the inner wall of the mixing drum and blades occupies effective volume. When a new batch of material is added, this "dead material" alters the actual ratio of cement, aggregate, and water, causing key indicators such as strength and slump of the fresh concrete to fail to meet standards. Furthermore, the adhering concrete, especially hardened sand and gravel, significantly accelerates the wear of the mixing blades and the inner wall of the drum. Uneven adhesion can cause severe vibrations in the mixing drum during rotation, increasing fatigue stress on bearings, supports, and other structures, posing a risk of breakage. Therefore, regular and thorough cleaning of the inside of the concrete mixing plant is necessary to maintain smooth surfaces, even out wear, and significantly extend the replacement cycle of vulnerable parts.

[0003] In existing technologies, cleaning concrete mixing plants typically involves operators using high-pressure water guns to rinse the blades and all corners of the drum wall from multiple angles, including the feed inlet and observation port. Alternatively, acid can be used to chemically react with cement hydration products (such as calcium hydroxide) in the concrete, dissolving and loosening them for easier rinsing. Some self-cleaning concrete mixing plants use a combination of water spraying and scrapers on the inner wall of the chamber for cleaning. However, when the scrapers remove the sticky wet concrete from the inner wall of the mixing plant chamber, some wet concrete remains on the scrapers. Although the inner wall and blades of the mixing plant chamber are cleaned, the scrapers themselves are not thoroughly cleaned, which still affects key indicators such as the strength and slump of the fresh concrete. Utility Model Content

[0004] This utility model addresses the technical problem that concrete mixing devices fail to thoroughly clean concrete adhering to the scraper during self-cleaning. It provides a self-cleaning concrete mixing device, comprising a mixing drum and a support connected to the bottom of the mixing drum. A variable frequency motor is connected to the center of the bottom of the mixing drum. The top and bottom of the mixing drum are respectively provided with an inlet and an outlet. A control valve is also provided on the outlet. The mixing drum contains a mixing shaft and spiral mixing blades fixedly connected to the mixing shaft. The mixing shaft is fixedly connected to the output end of the variable frequency motor's shaft. A gear is fixedly connected to the top of the mixing shaft.

[0005] The top center of the mixing tank is also provided with a pressure water storage tank and a hollow sleeve connected to the pressure water storage tank. An internal gear ring is fixedly connected to the bottom center of the hollow sleeve, and the internal gear ring is matched with the gear.

[0006] Both sides of the hollow sleeve are connected to scrapers. Multiple water spray nozzles are evenly arranged on both sides of the scrapers near the edge of the stirring shaft. Both the hollow sleeve and the scrapers have internal pipes that are connected to the pressure water storage tank. Each of the internal pipes is connected to each of the water spray nozzles.

[0007] Preferably, in the above technical solution, the bottom of the mixing tank is concave in the center and convex at the edges, and the scraper is "L" shaped and matches the convex edge of the bottom of the mixing tank.

[0008] Preferably, in the above technical solution, a sealed bearing is embedded in the center of the bottom of the mixing tank, and the inner ring of the sealed bearing is fixedly connected to the mixing shaft. An auxiliary bearing is embedded in the center of the bottom of the mixing tank, and the inner ring of the auxiliary bearing is slidably connected to the hollow sleeve.

[0009] Preferably, in the above technical solution, the spray nozzle includes an angled nozzle and a protective box disposed around the nozzle, and the angle formed between the spray direction of the angled nozzle and the surface of the scraper is less than 60°.

[0010] Preferably, in the above technical solution, the protective box is provided with a hinge on the side near the stirring shaft, and a cover plate is fixedly connected to the other end of the hinge.

[0011] Preferably, in the above technical solution, the maximum opening angle of the hinge is 45°, and permanent magnets are provided at the positions on the other side of the protective box that are in contact with the cover plate.

[0012] Preferably, in the above technical solution, the outer ring of the hollow sleeve is fitted with a limiting ring, and the outer side of the limiting ring is evenly provided with 4 rotating shaft protrusions and 4 supporting members.

[0013] Preferably, in the above technical solution, each of the support members has a through hole in the middle section, the through hole matches the rotating shaft protrusion, and each of the support members has a support foot at each end.

[0014] Preferably, in the above technical solution, the upper and lower surfaces of the spiral stirring blades are coated with an ultra-high molecular weight polyethylene coating.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention provides a pressure water storage tank above the mixing drum, which is connected to multiple water spray nozzles on the edge of the scraper. This allows for the washing away of concrete residue adhering to the scraper, thus achieving a more thorough cleaning of the concrete mixing device.

[0017] This invention features an internal gear ring on a hollow sleeve connected to the scraper, which engages with a gear at the top of the mixing shaft. This allows the scraper to clean the inner wall and mix concrete using the same variable frequency motor. Furthermore, the limiting ring disengages the internal gear ring from the gear during concrete mixing, preventing the scraper from moving and avoiding unnecessary wear caused by its ineffective operation.

[0018] The protective box and cover plate around the spray nozzle of this utility model can limit the spray angle of the angled nozzle, and provide a certain degree of protection for the angled nozzle during stirring, so as to prevent the angled nozzle from being blocked by concrete mortar and affecting the rinsing effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a self-cleaning concrete mixing device according to the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of a self-cleaning concrete mixing device according to the present invention. Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the internal structure of a self-cleaning concrete mixing device according to the present invention. Figure 2 ;

[0022] Figure 4 for Figure 2 Enlarged view of the hollow sleeve and gear;

[0023] Figure 5 This is a schematic diagram of the structure of a water spray nozzle in a self-cleaning concrete mixing device according to the present invention.

[0024] Figure 6 This is a schematic diagram of the limiting ring in a self-cleaning concrete mixing device according to the present invention.

[0025] Explanation of key figure labels:

[0026] 1-Mixing tank, 2-Support, 3-Variable frequency motor, 5-Pressure water storage tank, 6-Mixing shaft, 7-Scraper, 8-Limit ring, 11-Inlet, 12-Outlet, 13-Control valve, 14-Sealed bearing, 15-Auxiliary bearing, 61-Helical mixing blade, 62-Gear, 71-Water nozzle, 72-Inner pipe, 73-Hollow sleeve, 76-Inner gear ring, 81-Support component, 82-Rotating shaft protrusion, 711-Angled nozzle, 712-Protective box, 713-Hinge, 714-Cover plate, 715-Permanent magnet, 811-Support foot, 812-Through hole. Detailed Implementation

[0027] 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.

[0028] like Figures 1-6 As shown, this utility model discloses a device for conveying concrete aggregates, comprising a mixing drum 1 and a support 2 connected to the bottom of the mixing drum 1. A variable frequency motor 3 is connected to the center of the bottom of the mixing drum 1. The top and bottom of the mixing drum 1 are respectively provided with a feed inlet 11 and a discharge outlet 12. A control valve 13 is also provided on the discharge outlet 12. The mixing drum 1 contains a mixing shaft 6 and spiral mixing blades 61 fixedly connected to the mixing shaft 6. The mixing shaft 6 is fixedly connected to the output end of the rotating shaft of the variable frequency motor 3. A gear 62 is fixedly connected to the top end of the mixing shaft 6. The variable frequency motor 3 can control the mixing speed of the concrete mixing device, thus making it suitable for mixing various types of concrete. The upper and lower surfaces of the spiral mixing blades 61 are coated with an ultra-high molecular weight polyethylene coating. The ultra-high molecular weight polyethylene coating can significantly reduce the friction coefficient of the spiral mixing blades 61, reducing wear and tear caused by friction with concrete mortar. Utilizing its excellent non-stick and wear-resistant properties, after the concrete mixing is completed and the material is unloaded, controlling the spiral mixing blades 61 to idle allows centrifugal force to "throw" away any small amount of mortar residue adhering to its surface, which then falls onto the inner wall and bottom of the mixing tank 1, easily achieving self-cleaning of the spiral mixing blades 61. The top center of the mixing tank 1 is also equipped with a pressure water storage chamber 5 and a hollow sleeve 73 connected to the pressure water storage chamber 5. An internal gear ring 76 is fixedly connected to the bottom center of the hollow sleeve 73, and the internal gear ring 76 matches the gear 62. Scrapers 7 are connected to both sides of the hollow sleeve 73. Multiple water spray nozzles 71 are evenly arranged on both sides of the scraper 7 near the edge of the mixing shaft 6. Both the hollow sleeve 73 and the scraper 7 have internal pipes 72 that are connected to the pressure water storage chamber 5, and each internal pipe 72 is connected to a water spray nozzle 71. By fitting the internal gear ring 76 onto the gear 62, the hollow sleeve 73 and the scraper 7 can rotate together with the mixing shaft 6, thus cleaning the inner wall of the mixing tank 1 with the scraper 7. The water spray nozzle 71 sprays water towards the inner wall of the mixing tank 1, which can wash away the small amount of residual concrete mortar on the inner wall and wash away the concrete stuck on the scraper 7, thereby cleaning the scraper 7.

[0029] It should be further explained that a sealed bearing 14 is embedded in the center of the bottom of the mixing tank 1, and the inner ring of the sealed bearing 14 is fixedly connected to the mixing shaft 6. An auxiliary bearing 15 is embedded in the center of the bottom of the mixing tank 1, and the inner ring of the auxiliary bearing 15 is slidably connected to the hollow sleeve 73. The sealed bearing 14 ensures that the mortar in the mixing tank 1 flows out of the mixing tank 1 during the mixing process. The auxiliary bearing 15 reduces friction with the top plate of the mixing tank 1 when the scraper 7 and the hollow sleeve 73 rotate, avoiding unnecessary wear and tear. The bottom of the mixing tank 1 is concave in the center and convex at the edge. The scraper 7 is "L" shaped and matches the convex edge of the bottom of the mixing tank 1. The mixing tank 1 is designed with a concave bottom and convex edge so that a small amount of residual concrete mortar collects at the bottom of the convex edge under the action of gravity, and then is discharged from the mixing tank 1 through the discharge port 12 located at the bottom edge.

[0030] In this embodiment, a limiting ring 8 is fitted around the outer ring of the hollow sleeve 73. Four rotating shaft protrusions 82 and four support members 81 are evenly distributed on the outer side of the limiting ring 8. Each support member 81 has a through hole 812 in its middle section, which matches the rotating shaft protrusion 82. Each support member 81 has a support foot 811 at each end. When mixing concrete, rotating the four support members 81 on the limiting ring 8 disengages the internal gear ring 76 from the gear 62, thus keeping the hollow sleeve 73 and scraper 7 stationary and preventing wear and tear on the scraper 7 and other components caused by unnecessary rotation. When cleaning is required, rotating the four support members 81 on the limiting ring 8 causes the hollow sleeve 73 and scraper 7 to engage the internal gear ring 76 with the gear 62 under gravity. Starting the variable frequency motor 3 synchronously drives the scraper 7, stirring shaft 6, and spiral stirring blades 61 to rotate, achieving the self-cleaning function of the mixing tank 1.

[0031] In this embodiment, the spray nozzle 71 includes an angled nozzle 711 and a protective box 712 disposed around the nozzle 711. The angle formed by the spray direction of the angled nozzle 711 and the surface of the scraper 7 is less than 60°. The main spray target of the angled nozzle 711 is the surface of the scraper 7. The protective box 712 is provided with a hinge 713 on the side near the stirring shaft 6, and a cover plate 714 is fixedly connected to the other end of the hinge 713. The maximum opening angle of the hinge 713 is 45°. Permanent magnets 715 are provided at the positions on the other side of the protective box 712 where it fits against the cover plate 714. During daily mixing and processing, the protective box 712 and the cover plate 714, under the magnetic attraction of the permanent magnets 715, jointly form a protection for the angled nozzle 711, preventing concrete mortar from clogging the angled nozzle 711 during mixing. After mixing and unloading are completed, when the variable frequency motor 3 is started for self-cleaning, water is pressurized and sprayed out from the inclined nozzle 711 along the inner pipe 72. The impact force of the water flow opens the cover plate 714, breaking free from the magnetic attraction with the protective box 712. The maximum opening angle of the hinge 713 determines that the water flow hits the not fully opened cover plate 714, splashing and forming a scouring effect on the scraper 7 and the inner wall of the mixing tank 1, achieving thorough self-cleaning of the mixing tank 1. This achieves the technical effect of saving manpower and reducing the economic expenditure of concrete processing and production.

[0032] This invention features a pressure water storage tank above the mixing drum, connected to multiple water spray nozzles along the edge of the scraper. This allows for the rinsing of concrete residue adhering to the scraper, achieving a more thorough cleaning of the concrete mixing device. An internal gear ring on the hollow sleeve connected to the scraper engages with a gear at the top of the mixing shaft. The same variable frequency motor enables both scraper cleaning of the inner wall and concrete mixing. Furthermore, a limiting ring disengages the internal gear ring from the gear during concrete mixing, preventing the scraper from moving and avoiding unnecessary wear and tear. Protective boxes and covers around the water spray nozzles limit the spray angle of the angled nozzles and provide protection during mixing, preventing blockage by concrete mortar and ensuring effective rinsing. This invention solves the technical problem of incomplete cleaning of concrete residue adhering to the scraper during the self-cleaning process of concrete mixing devices.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

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