High-viscosity paste stirring anti-wall-hanging device

Abstract

The invention provides a full-high-viscosity paste stirring anti-wall-hanging device, and relates to the technical field of mining machinery. The device comprises a horizontal stirring tank, a first stirring shaft and a second stirring shaft which are arranged in parallel, a transmission system and a scraper assembly, a feed port is formed in the top of the stirring tank, and a discharge port is formed in the bottom; the first stirring shaft and the second stirring shaft synchronously and reversely rotate through a gear box, and flat plate paddles and scraper mounting shafts are alternately arranged on the two shafts; and the scraper assembly is connected with the scraper mounting shaft through an elastic pressure mechanism. According to the device, uniform mixing of high-viscosity materials and efficient wall sticking prevention are realized through synchronous reverse rotation of double shafts, dynamic pressure scraping plates and informatization dynamic adjustment. The device is suitable for continuous industrial production of materials such as high-concentration waste stone tailing paste and cementing materials, and the problems that a traditional double-shaft stirring machine adheres to walls and blocks, and is high in energy consumption and difficult to maintain are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of mining machinery, in particular to a device for preventing high-viscosity paste from stirring and adhering to the wall. Background Art

[0002] In-fill mining involves filling goaf with filler material during ore removal, transportation, and other operations. A major challenge in green mine construction is the significant land occupation and potential secondary pollution caused by solid waste generated from mines. This solid waste includes mining strippings, waste rock, slag, and fly ash. Mine waste generation and emissions are substantial. Statistics indicate that over 8 billion tons of tailings are currently stored in my country's metal mines, with output increasing at a rate of 800 to 1 billion tons per year. In-fill mining offers the advantages of reduced mining workload, greater flexibility, and minimal ore loss and dilution. It can eliminate ground subsidence caused by mining activities, improve the mining stress environment, and enhance the stress state of the pillars (from uniaxial compression to triaxial compression), ensuring maximum mineral resource recovery. It also reduces the emission of solid waste, such as waste rock and tailings. It can adapt to various mining conditions and is a current green mining method, essentially meeting the three key requirements of high resource utilization efficiency, minimal waste emissions, and intact surface conditions. There is no doubt that backfill mining will become the first choice under the premise of green mines.

[0003] Paste filling technology, as the core process of modern mine filling, exhibits multi-dimensional advantages by mixing tailings, cementitious materials and industrial wastewater in a specific ratio to form a non-Newtonian fluid with a concentration of 75%-85%. Its high viscosity ensures the dense and stable filling body, while suppressing the deformation of the surrounding rock in the goaf, and increasing the utilization rate of solid waste such as tailings to more than 90%, significantly reducing the environmental risk of tailings ponds. The unique structural flow pattern reduces the pipeline transportation resistance by 30%-40% compared with traditional processes. Combined with the precise control of the cementitious material dosage, it can not only adapt to the mining intensity requirements of different ore bodies, but also achieve a top connection rate of more than 95% for the filling body, creating mechanical conditions for pillar replacement mining and increasing the ore recovery rate by 15%-20%. Through the collaborative mining and filling operation mode, this technology shortens the traditional segmented filling cycle by 40%, forming a closed loop of "solid waste utilization-ground pressure control-resource recovery", becoming a key technical support for green mine construction with both environmental and economic benefits.

[0004] Currently, paste-filling mines require fast, efficient, and uniform preparation of paste slurry. When preparing high-viscosity paste-filling slurries, horizontal twin-shaft mixers achieve more continuous production and more uniform mixing at lower speeds than traditional vertical mixers. However, high-viscosity paste slurries are more susceptible to sticking to the mixer walls. This adhesion layer of high-viscosity material forms on the tank walls, reducing effective volume and affecting the uniformity of slurry preparation. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art such as the easy wall sticking of mixers, the embodiment of the present invention provides a device for preventing high-viscosity paste from sticking to the wall when stirring. The technical solution is as follows: A device for preventing high-viscosity paste from adhering to the wall, which is mainly used in the production of mine filling paste slurry, includes a horizontal stirring tank, a first stirring shaft, a second stirring shaft, a transmission system and a scraper assembly; The horizontal stirring tank is provided with a feed port at the top and a discharge port at the bottom; the first stirring shaft and the second stirring shaft are arranged in parallel on the same horizontal plane, and the first stirring shaft and the second stirring shaft are driven by a gear box through a transmission system to achieve synchronous counter-rotation; Flat blades and scraper mounting shafts are alternately arranged on the first stirring shaft and the second stirring shaft, and when the flat blades are arranged, the outer ends of the flat blades are at least 10 mm away from the inner sides of the scrapers; The scraper assembly comprises a scraper mounting shaft and a scraper working surface, and the scraper working surface is connected to the scraper mounting shaft through an elastic pressure mechanism.

[0006] The feed port and the discharge port are arranged along a diagonal line in the vertical direction.

[0007] The transmission system includes a main motor, a reducer gear set and a reversing gear set. The main motor drives the reducer gear set and the reversing gear set. The reducer gear set and the reversing gear set are placed in a gear box to drive the first stirring shaft and the second stirring shaft.

[0008] The distance between the first stirring shaft and the second stirring shaft is greater than the length of a single scraper mounting shaft plus the length of the scraper working surface; The first stirring shaft and the second stirring shaft are respectively provided with a conductive slip ring 1 and a conductive slip ring 2 on one side of the transmission system. The conductive slip ring 1 and the conductive slip ring 2 provide fine-tuning control power for the scraper assembly, and transmit the pressure sensor signal inside the scraper mounting shaft and the stirring shaft torque signal, and adjust the scraper working status in real time through monitoring data.

[0009] The elastic pressure mechanism includes a disc spring group, a displacement sensor, a hydraulic fine-tuning cylinder and a limiting steel cable. The bottom of the hydraulic fine-tuning cylinder is connected to the scraper mounting shaft, and the top of the hydraulic fine-tuning cylinder is connected to the scraper working surface through the limiting steel cable. The columnar structure formed by the hydraulic fine-tuning cylinder, the scraper mounting shaft and the limiting steel cable is covered with a disc spring group on the outside, and the displacement sensor is installed inside the hydraulic fine-tuning cylinder.

[0010] The radial compensation of the scraper assembly is ±10mm, and the pressure adjustment range is 50-500N.

[0011] The flat blades are spirally arranged on each stirring shaft, adopting a constant pitch design, with a distance between each blade of 50 cm; and an angle between adjacent blades of 90°.

[0012] Two scraper assemblies are installed on the first stirring shaft and the second stirring shaft. The scraper working surface of each scraper assembly is connected to the stirring shaft through two scraper mounting shafts. The scraper mounting shaft is not less than 100 mm away from the flat blade.

[0013] The gap between the scraper working surface and the inner wall of the mixing tank is adjustable, and the installation gap is 10±5mm; the scraper assembly is adjusted through the scraper installation shaft, and its radial compensation amount is ±10mm.

[0014] The power of the main motor is 90kW, the speed of the stirring shaft after deceleration is 20-60rpm, and the torque fluctuation rate is ≤3%.

[0015] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least: The above scheme, through the synergistic effect of a dual-shaft synchronous counter-rotating mechanism and an elastic pressure-compensating scraper, not only achieves strong shear mixing of high-viscosity pastes, but also completely removes the adhesive layer by dynamically adjusting the contact pressure between the scraper and the inner wall of the mixing tank. An intelligent sensing system monitors the scraper pressure and the agitator shaft torque in real time. Based on the monitoring data, the hydraulic fine-tuning cylinder inside the scraper mounting shaft is fine-tuned to adjust the gap between the scraper and the agitator tank wall. This is then linked to the motor to control the agitator shaft torque. This achieves real-time compensation for scraper wear and ensures low deviation in the dual-shaft mixing torque. Therefore, this invention helps prevent material from adhering to the inner surface of the mixer. By adjusting the pressure of the scraper against the inner wall in real time, it reduces scraper wear and extends its service life, further improving the mixer's anti-sticking effect. Based on this invention, it can provide support for the mixing and preparation process of high-viscosity paste slurries in mining production, ensuring more uniform mixing, better mixing effect, and better paste quality. The device of the present invention has a more optimized structure and a more rational design, and has important practical value, suitable for mining enterprises such as metal and non-metal mining enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic structural diagram of a device for stirring and preventing high-viscosity paste from wall-adhering provided by an embodiment of the present invention; Figure 2This is an enlarged view of the elastic pressure mechanism in a device for preventing high-viscosity paste from stirring and wall-adhering provided by an embodiment of the present invention; Figure 3 Schematic diagram of the installation of flat blades on the stirring shaft in an embodiment of the present invention.

[0018] Among them: 1-horizontal mixing tank; 2-first mixing shaft; 3-second mixing shaft; 4-transmission system; 5-scraper assembly; 6-feed port; 7-discharge port; 8-gear box; 9-flat blade; 10-scraper mounting shaft; 11-elastic pressure mechanism; 101-inner wall of mixing tank; 201-conductive slip ring 1; 301-conductive slip ring 2; 401-main motor; 402-reducer gear set; 403-reversing gear set; 501-scraper working surface; 1101-disc spring set; 1102-hydraulic fine-tuning cylinder; 1103-limiting steel cable. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0020] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as an "exemplary" in the present invention should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner. Furthermore, in the embodiments of the present invention, "and / or" can mean both or either of the two.

[0021] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0022] The embodiment of the present invention provides a device for preventing high-viscosity paste from sticking to the wall when stirring. Figure 1 The device for preventing high-viscosity paste from adhering to the wall shown includes a horizontal stirring tank 1, a first stirring shaft 2, a second stirring shaft 3, a transmission system 4 and a scraper assembly 5; The horizontal stirring tank 1 is provided with a feed port 6 at the top and a discharge port 7 at the bottom; the first stirring shaft 2 and the second stirring shaft 3 are arranged in parallel on the same horizontal plane, and the first stirring shaft 2 and the second stirring shaft 3 are driven by a gear box 8 through a transmission system 4 to achieve synchronous counter-rotation; Flat blades 9 and scraper mounting shafts 10 are alternately arranged on the first stirring shaft 2 and the second stirring shaft 3; when the flat blades are arranged, the outer ends of the flat blades are at least 10 mm away from the inner sides of the scrapers; The scraper assembly 5 includes a scraper mounting shaft 10 and a scraper working surface 501 . The scraper working surface 501 is connected to the scraper mounting shaft 10 via an elastic pressure mechanism 11 .

[0023] The feed port and the discharge port are arranged along a diagonal line in the vertical direction.

[0024] The transmission system 4 includes a main motor 401, a reducer gear set 402 and a reversing gear set 403. The main motor drives the reducer gear set and the reversing gear set, and the reducer gear set and the reversing gear set are placed in a gear box to drive the first stirring shaft and the second stirring shaft.

[0025] The distance between the first stirring shaft and the second stirring shaft is greater than the length of a single scraper mounting shaft plus the length of the scraper working surface; The first stirring shaft and the second stirring shaft are respectively provided with a conductive slip ring 1 and a conductive slip ring 2 on one side of the transmission system. The conductive slip ring 1 and the conductive slip ring 2 provide fine-tuning control power for the scraper system, and transmit the pressure sensor signal inside the scraper mounting shaft and the stirring shaft torque signal, and adjust the scraper working status in real time through monitoring data.

[0026] like Figure 2 As shown, the elastic pressure mechanism 11 includes a disc spring group 1101, a displacement sensor, a hydraulic fine-tuning cylinder 1102 and a limiting steel cable 1103. The bottom of the hydraulic fine-tuning cylinder 1102 is connected to the scraper mounting shaft 10, and the top of the hydraulic fine-tuning cylinder 1102 is connected to the scraper working surface 501 through the limiting steel cable 1103. The columnar structure formed by the hydraulic fine-tuning cylinder 1102, the scraper mounting shaft 10 and the limiting steel cable 1103 is covered with a disc spring group 1101 on the outside, and the displacement sensor is installed inside the hydraulic fine-tuning cylinder.

[0027] The radial compensation of the scraper assembly is ±10mm, and the pressure adjustment range is 50-500N.

[0028] The flat blades are spirally arranged on each stirring shaft, adopting a constant pitch design, with a distance between each blade of 50 cm; and an angle between adjacent blades of 90°.

[0029] Two scraper assemblies are installed on the first stirring shaft and the second stirring shaft. The scraper working surface of each scraper assembly is connected to the stirring shaft through two scraper mounting shafts. The scraper mounting shaft is not less than 100 mm away from the flat blade.

[0030] The gap between the scraper working surface and the inner wall 101 of the mixing tank is adjustable, and the installation gap is 10±5mm; the scraper assembly is adjusted through the scraper installation shaft.

[0031] The power of the main motor is 90kW, the speed of the stirring shaft after deceleration is 20-60rpm, and the torque fluctuation rate is ≤3%.

[0032] In this device, the scraper mounting shaft 10 is provided with elastic force by the disc spring group 1101 to press the scraper working surface 501 against the inner wall of the mixer. The limiting steel cable 1103 prevents the spring from applying excessive force to the scraper, which causes increased wear. The scraper data is monitored in real time by the displacement sensor and uploaded to the smart terminal. The scraper working position is quickly and accurately fine-tuned by the hydraulic fine-tuning cylinder 1102.

[0033] The transmission system 4 mainly provides power for the horizontal mixer through the main motor 401, converts the high speed output by the main motor 401 into high torque through the reducer gear set 402, and then transmits it to the first stirring shaft 2 and the second stirring shaft 3 through the reversing gear set 403, driving the horizontal mixer to operate.

[0034] In the entire device, the circuit extends through the first stirring shaft 2 and the second stirring shaft 3 to the conductive slip ring 1 201 and the conductive slip ring 2 301, and is finally connected to an external smart terminal for real-time monitoring and adjustment.

[0035] In practice, a copper mine uses a downward-entry backfill mining method for recovery, requiring the preparation of a paste slurry with a concentration of 78% (mass fraction). The paste slurry is made from a mixture of -16mm waste rock, tailings, cement, and water, with a lime-sand ratio of 1:4. The waste rock, tailings, cement, and water are continuously added through the feed inlet to a twin-shaft horizontal mixer equipped with a scraper. The mixer rotates at 50 rpm. While the slurry is uniformly mixed in the mixer, it is continuously conveyed by the mixing blades to the discharge outlet on the other side of the mixer. It is then transported via a pipeline to the underground stope for backfilling. During the mixing process, since the slurry is not mixed evenly in the early stage, the slurry viscosity is not high, and the slurry sticking to the wall is relatively light, the scraper can be kept at a close distance from the mixer wall; as the production time increases, the slurry is gradually mixed evenly, and its viscosity gradually increases. Some coarse aggregate is mixed with the hydrated cement and sticks to the inner wall of the mixer, forming a rough surface. At this time, the scraper can be adjusted slightly away from the mixer wall, and the output torque of the motor can be adjusted to avoid large wear on the scraper while effectively scraping off the slurry sticking to the wall.

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A device for preventing high-viscosity paste from sticking to the wall when stirring, characterized in that: It includes a horizontal stirring tank, a first stirring shaft, a second stirring shaft, a transmission system and a scraper assembly; The horizontal stirring tank is provided with a feed port at the top and a discharge port at the bottom; the first stirring shaft and the second stirring shaft are arranged in parallel on the same horizontal plane, and the first stirring shaft and the second stirring shaft are driven by a gear box through a transmission system to achieve synchronous counter-rotation; Flat blades and scraper mounting shafts are alternately arranged on the first stirring shaft and the second stirring shaft, and when the flat blades are arranged, the outer ends of the flat blades are at least 10 mm away from the inner sides of the scrapers; The scraper assembly comprises a scraper mounting shaft and a scraper working surface, and the scraper working surface is connected to the scraper mounting shaft through an elastic pressure mechanism.

2. The device for preventing high-viscosity paste from being stirred on the wall according to claim 1, characterized in that: The feed port and the discharge port are arranged along a diagonal line in the vertical direction.

3. The device for preventing high-viscosity paste from being stirred on the wall according to claim 1, characterized in that: The transmission system includes a main motor, a reducer gear set and a reversing gear set. The main motor drives the reducer gear set and the reversing gear set. The reducer gear set and the reversing gear set are placed in a gear box to drive the first stirring shaft and the second stirring shaft.

4. The device for preventing high-viscosity paste from being stirred on the wall according to claim 1, characterized in that: The distance between the first stirring shaft and the second stirring shaft is greater than the length of a single scraper mounting shaft plus the length of the scraper working surface; The first stirring shaft and the second stirring shaft are respectively provided with a conductive slip ring 1 and a conductive slip ring 2 on one side of the transmission system. The conductive slip ring 1 and the conductive slip ring 2 provide fine-tuning control power for the scraper assembly, and transmit the pressure sensor signal inside the scraper mounting shaft and the stirring shaft torque signal, and adjust the scraper working status in real time through monitoring data.

5. The device for preventing high-viscosity paste from being stirred on the wall according to claim 1, characterized in that: The elastic pressure mechanism includes a disc spring group, a displacement sensor, a hydraulic fine-tuning cylinder and a limiting steel cable. The bottom of the hydraulic fine-tuning cylinder is connected to the scraper mounting shaft, and the top of the hydraulic fine-tuning cylinder is connected to the scraper working surface through the limiting steel cable. The columnar structure formed by the hydraulic fine-tuning cylinder, the scraper mounting shaft and the limiting steel cable is covered with a disc spring group on the outside, and the displacement sensor is installed inside the hydraulic fine-tuning cylinder.

6. The device for preventing high-viscosity paste from being stirred on the wall according to claim 1, characterized in that: The radial compensation of the scraper assembly is ±10mm, and the pressure adjustment range is 50-500N.

7. The device for preventing high-viscosity paste from being stirred on the wall according to claim 1, characterized in that: The flat blades are spirally arranged on each stirring shaft, adopting a constant pitch design, with a distance between each blade of 50 cm; and an angle between adjacent blades of 90°.

8. The device for preventing high-viscosity paste from being stirred on the wall according to claim 1, characterized in that: Two scraper assemblies are installed on the first stirring shaft and the second stirring shaft. The scraper working surface of each scraper assembly is connected to the stirring shaft through two scraper mounting shafts. The scraper mounting shaft is not less than 100 mm away from the flat blade.

9. The device for preventing high-viscosity paste from being stirred on the wall according to claim 1, characterized in that: The gap between the scraper working surface and the inner wall of the mixing tank is adjustable, and the installation gap is 10±5mm; the scraper assembly is adjusted through the scraper installation shaft, and the radial compensation amount of the scraper assembly is ±10mm.

10. The device for preventing high-viscosity paste from being stirred on the wall according to claim 3, characterized in that: The power of the main motor is 90kW, the speed of the stirring shaft after deceleration is 20-60rpm, and the torque fluctuation rate is ≤3%.

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