Material scraping device of crystallizing tank
The electromagnetically driven scraper device enables dynamic adjustment of the distance between the scraper and the tank wall, solving the problem that traditional scrapers cannot adapt to changes in the thickness of the crystallized layer. This improves the operating efficiency and stability of MVR evaporation crystallization, reduces energy consumption, and minimizes scraper wear.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-24
AI Technical Summary
Traditional rigid fixed scrapers cannot adapt to changes in crystal layer thickness, resulting in high energy consumption in thin-layer conditions and overload wear of the scraper in thick-layer conditions, affecting the operating efficiency and stability of MVR evaporation crystallization.
The scraper device, driven by an electromagnet, dynamically adjusts the distance between the scraper and the tank wall via a magnetic adjustment rod. Combined with a limit spring and a distance sensor, it forms a closed-loop adjustment system to control the radial displacement and pressure of the scraper. A buffer layer is also provided to reduce wear.
It improves the operating efficiency and stability of MVR evaporation crystallization, reduces energy consumption, minimizes damage to the inner wall of the crystallizer by the scraper, and enhances the adaptability and reliability of the system.
Smart Images
Figure CN224024304U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to MVR evaporation crystallization technical field especially relates to a crystallization tank scraping device. BACKGROUND
[0002] In the MVR evaporation crystallization process, the crystal is easy to attach to the inner wall of the crystallization tank and form a scale layer, which needs to be continuously scraped off by a rotating scraper to maintain the heat transfer efficiency and ensure the uniformity of the crystal particles. The traditional scraping device is mainly a rigid fixed scraper. The gap between this scraper and the tank wall is fixed, and it cannot adapt to the change in the thickness of the crystalline layer, which leads to high energy consumption in the thin layer condition and overloading and wear of the scraper in the thick layer condition.
[0003] Therefore, there is an urgent need for a scraping device with dynamic adjustment capability to improve the operating efficiency and stability of the MVR clean system. SUMMARY
[0004] Therefore, the utility model provides a crystallization tank scraping device.
[0005] The technical scheme of the utility model is implemented as follows: The utility model provides a crystallization tank scraping device, which comprises a crystallization tank, a stirring motor and a fixed stirring scraper. The fixed stirring scraper is rotatably arranged in the crystallization tank. The stirring motor drives the fixed stirring scraper to rotate through a rotating shaft. The fixed stirring scraper comprises a horizontal scraper and a vertical scraper. The horizontal scraper is horizontally arranged at the bottom of the stirring shaft. Two vertical scrapers are vertically arranged above the two ends of the horizontal scraper. The utility model further comprises a first lever, a first adjusting scraper, an adjusting rod, a ferromagnetic block and an electromagnet. The first adjusting scraper and the adjusting rod are respectively arranged in parallel on the opposite sides of the vertical scraper. The first adjusting scraper is close to the inner wall of the crystallization tank. The two ends of the first lever are respectively hinged to the first adjusting scraper and the adjusting rod. The middle of the first lever is hinged to the vertical scraper. A plurality of first levers on the same vertical scraper are arranged in parallel. The top of the adjusting rod is fixedly provided with the ferromagnetic block. The electromagnet is arranged above the ferromagnetic block in a spaced manner and is fixed in the crystallization tank.
[0006] In the above implementation mode, the ferromagnetic block at the top of the adjusting rod is attracted by the magnetic force generated by the electromagnet, which drives the adjusting rod to move up and down. Then, the first lever converts the linear motion into the radial displacement of the first adjusting scraper, thereby realizing the dynamic adjustment of the distance between the scraper and the tank wall.
[0007] In some implementation modes, a limiting spring is further arranged. The bottom of the adjusting rod is connected to the horizontal scraper through the limiting spring.
[0008] In the above implementation mode, the bottom of the adjusting rod is connected to the horizontal scraper through the limiting spring. The electromagnetic force and the spring force are dynamically balanced, thereby realizing the fine control of the scraping pressure and the impact buffering.
[0009] In some embodiments, a second adjusting blade, a second lever and a connecting rod are further included, the second adjusting blade is arranged on one side of the horizontal blade close to the bottom of the crystallization tank, the second adjusting blade is hingedly connected to the horizontal blade through the second lever at one end close to the vertical blade, the second lever is hingedly connected to the adjusting rod at the other end away from the second adjusting blade, and the second adjusting blade is connected to the horizontal blade through the connecting rod at the other end away from the vertical blade.
[0010] In the above embodiments, the second adjusting blade is linked with the adjusting rod through the second lever and the connecting rod, and the distance between the horizontal blade and the bottom of the tank is changed synchronously when the adjusting rod moves, so that three-dimensional material scraping adaptation is realized.
[0011] In order to realize the above adjusting function, the hinging shaft of the second lever and the horizontal blade and the hinging shaft between the second lever and the adjusting rod are not in the same vertical plane.
[0012] In some embodiments, the electromagnet is circular ring-shaped, and the electromagnet is coaxially arranged outside the rotating shaft and above the ferromagnetic block.
[0013] In some embodiments, a distance measuring sensor is further included, and the distance measuring sensor is arranged on the lower surface of the electromagnet.
[0014] The distance measuring sensor can feed back the distance between the scraper and the tank wall in real time, so that a closed-loop adjusting system is formed and the adaptability is improved.
[0015] In some embodiments, a first buffer layer is further included, and the first buffer layer is arranged on one side of the first adjusting blade close to the inner wall of the crystallization tank.
[0016] In some embodiments, the first buffer layer is made of polyurethane or fluororubber.
[0017] In some embodiments, a second buffer layer is further included, and the second buffer layer is arranged on one side of the second adjusting blade close to the bottom of the crystallization tank.
[0018] In some embodiments, the second buffer layer is made of polyurethane or fluororubber.
[0019] In some embodiments, a cooling jacket is arranged on the surface of the electromagnet, and the cooling jacket is in communication with a cooling circulation system outside the crystallization tank through a pipeline.
[0020] Compared with the prior art, the utility model has the following beneficial effects:
[0021] The utility model converts the electromagnetic linear drive into the radial displacement of the scraper, takes into account the dynamic adjusting characteristic, and has simple structure, the magnetic drive scraper can realize a certain degree of elastic displacement, and damage to the inner wall of the crystallization tank is avoided. The mechanical transmission type adjusting structure has high stability and reliability, low system complexity, and is easy to maintain. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described in the following are only some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.
[0023] Figure 1 It is a main sectional view of the crystallization tank scraping device of the present application.
[0024] Figure 2 It is a main sectional view of the crystallization tank part in the crystallization tank scraping device of the present application.
[0025] Figure 3 It is a front view of the fixed stirring scraper part in the crystallization tank scraping device of the present application.
[0026] In the figure: 1-crystallization tank, 2-stirring motor, 3-fixed stirring scraper, 31-horizontal knife, 32-vertical knife, 4-first lever, 5-first adjusting knife, 6-adjusting rod, 7-ferromagnetic block, 8-electromagnet, 9-limiting spring, 10-second adjusting knife, 11-second lever, 12-connecting rod, 13-distance measuring sensor, 14-first buffer layer, 15-second buffer layer, 16-cooling jacket. DETAILED DESCRIPTION
[0027] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.
[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0030] Furthermore, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered sequence. Thus, features defined with "first", "second" etc. can include one or more of the features. In the description of the application, the meaning of "a plurality" is two or more, unless expressly specified otherwise.
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the application belong. The definitions provided herein control over definitions in any patent, patent application, published patent application, and other publication that are cited herein by reference, in the event of a discrepancy.
[0032] As shown in Figure 1 combination Figures 2-3 The crystallization tank scraping device of the utility model, it includes: crystallization tank 1, agitator motor 2 and fixed agitator scraper 3, fixed agitator scraper 3 rotatable setting in crystallization tank 1, agitator motor 2 drives fixed agitator scraper 3 to rotate through rotating shaft, fixed agitator scraper 3 includes horizontal knife 31 and vertical knife 32, horizontal knife 31 is horizontally set at the bottom of stirring shaft, two vertical knives 32 are vertically set above the two ends of horizontal knife 31 respectively, it is characterized in that, still including first lever 4, first adjusting knife 5, adjusting rod 6, ferromagnetic block 7 and electromagnet 8, first adjusting knife 5 and adjusting rod 6 are respectively parallelly arranged on the opposite sides of vertical knife 32, first adjusting knife 5 is close to the inner wall of crystallization tank 1, the two ends of first lever 4 are hinged with first adjusting knife 5 and adjusting rod 6 respectively, the middle of first lever 4 is hinged with vertical knife 32, multiple first levers 4 on the same vertical knife 32 are parallelly arranged, the top of adjusting rod 6 is fixedly provided with ferromagnetic block 7, electromagnet 8 is spaced apart above ferromagnetic block 7, and electromagnet 8 is fixed in crystallization tank 1.
[0033] In the above embodiment, the first lever 4 constitutes a three-point torque balance mechanism, the fulcrum is located at the middle hinge point of the vertical knife 32, the power arm end is connected to the adjusting rod 6, and the resistance arm end drives the first adjusting knife 5. When the electromagnet 8 is energized to attract the ferromagnetic block 7, the adjusting rod 6 generates a vertical displacement, which causes the first adjusting knife 5 to generate a radial displacement through lever transmission, thereby achieving equal ratio adjustment of the scraping gap of the inner wall of the crystallization tank. The multiple first levers 4 arranged in parallel form a distributed adjustment array, which reduces the stress of the single hinge point through the principle of equal load division, ensuring the uniformity of the circumferential scraping of the tank wall.
[0034] In some embodiments, a limiting spring 9 is further included, and the bottom of the adjusting rod 6 is connected to the horizontal knife 31 through the limiting spring 9.
[0035] In the above embodiment, the limiting spring 9 provides elastic limiting for the adjusting rod 6 through pre-tightening force, generates a buffering effect in the process of the electromagnet 8 being attracted, and avoids rigid contact between the ferromagnetic block 7 and the electromagnet 8. When the electromagnet 8 is powered off, the spring energy storage releases to pull the adjusting rod 6 to reset, forming a double displacement guarantee mechanism, and limiting the maximum stroke of the adjusting rod 6 to prevent mechanical interference.
[0036] In some embodiments, a second adjusting blade 10, a second lever 11 and a connecting rod 12 are further included, the second adjusting blade 10 is arranged on one side of the horizontal blade 31 close to the bottom of the crystallization tank 1, the second adjusting blade 10 is hinged to the horizontal blade 31 through the second lever 11 close to one end of the vertical blade 32, the end of the second lever 11 away from the second adjusting blade 10 is hinged to the adjusting rod 6, and the end of the second adjusting blade 10 away from the vertical blade 32 is connected to the horizontal blade 31 through the connecting rod 12.
[0037] In the above embodiment, the second lever 11 and the horizontal blade 31 form a four-bar linkage mechanism, when the adjusting rod 6 is vertically displaced under the action of electromagnetic force, the vertical movement is converted into vertical direction displacement in the plane of the horizontal blade 31 through the force arm conversion effect of the second lever 11. The connecting rod 12 adopts a spherical hinge connection mode, allowing the second adjusting blade 10 to adapt to the deformation of the tank bottom curve while maintaining the scraping angle, and realizing three-dimensional follow-up compensation.
[0038] In some embodiments, the electromagnet 8 is a circular ring, and the electromagnet 8 is coaxially arranged outside the rotating shaft and above the ferromagnetic block 7.
[0039] In the above embodiment, the axisymmetric magnetic field generated by the annular electromagnet 8 can ensure that the ferromagnetic block 7 maintains uniform electromagnetic attraction during rotation, eliminating the magnetic pole switching problem existing in traditional strip-shaped electromagnets.
[0040] In some embodiments, a distance measuring sensor 13 is further included, and the distance measuring sensor 13 is arranged on the lower surface of the electromagnet 8.
[0041] In the above embodiment, the distance measuring sensor 13 adopts a laser triangulation principle, and a synchronous encoder is installed on the rotating shaft to realize phase-locked measurement. The measurement data is transmitted to the PLC control system through a slip ring to form a closed-loop PID regulation loop, which can dynamically adjust the current intensity of the electromagnet according to the thickness of the crystalline layer, and realize adaptive scraping control.
[0042] In some embodiments, a first buffer layer 14 is further included, and the first buffer layer 14 is arranged on one side of the first adjusting blade 5 close to the inner wall of the crystallization tank 1.
[0043] In the above embodiment, the first buffer layer 14 can be made of polytetrafluoroethylene-carbon fiber composite material and is fixed on the adjusting knife base through dovetail slot inlay structure. The surface is designed with 0.5mm deep flow guide microgroove, and a hydrodynamic pressure lubrication film is formed in the scraping process, which converts dry friction into boundary lubrication state, and the friction coefficient can be reduced to below 0.08.
[0044] In some embodiments, a second buffer layer 15 is further included, which is arranged on the side of the second adjusting knife 10 close to the bottom of the crystallization tank 1.
[0045] In the above embodiment, the second buffer layer 15 is designed in a composite structure. In the scraping movement, the compression deformation of the buffer layer can effectively absorb the impact energy caused by the thickness fluctuation of the crystallization layer on the tank bottom.
[0046] In some embodiments, the surface of the electromagnet 8 is provided with a cooling jacket 16 which is communicated with the cooling circulation system outside the crystallization tank 1 through a pipeline.
[0047] In the above embodiment, the cooling circulation system includes a plate heat exchanger and a magnetic drive pump, and uses ethylene glycol aqueous solution as the refrigerant. The pipeline is configured with a double check valve group to prevent siphon backflow when the pump is stopped. A temperature sensor is embedded in the inner wall of the cooling jacket, which triggers a warning when the detected temperature difference exceeds 5℃, ensuring the thermal stability of the electromagnet. The cooling jacket 16 is provided with a spiral guide vane, which forms a coaxial annular flow channel with the rotating shaft, so that the cooling liquid produces turbulent flow to strengthen heat exchange, and ensures that the temperature of the electromagnet winding is stable within the allowable range of H-class insulation.
[0048] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A scraping device for a crystallizer, comprising: crystallization The crystallization tank (1), stirring motor (2), and fixed stirring scraper (3) are rotatably mounted inside the crystallization tank (1). The stirring motor (2) drives the fixed stirring scraper (3) to rotate via a rotating shaft. The fixed stirring scraper (3) includes a horizontal blade (31) and a vertical blade (32). The horizontal blade (31) is horizontally mounted at the bottom of the stirring shaft, and the two vertical blades (32) are vertically mounted above the two ends of the horizontal blade (31). The crystallization tank (1) is characterized by further including a first lever (4), a first adjusting blade (5), an adjusting rod (6), a ferromagnetic block (7), and an electromagnet (8). The first adjusting blade (5) and the adjusting rod (6) are respectively arranged in parallel on opposite sides of the vertical blade (32). The first adjusting blade (5) is close to the inner wall of the crystallization tank (1). The two ends of the first lever (4) are respectively hinged to the first adjusting blade (5) and the adjusting rod (6). The middle of the first lever (4) is hinged to the vertical blade (32). Multiple first levers (4) on the same vertical blade (32) are arranged in parallel. A ferromagnetic block (7) is fixedly installed on the top of the adjusting rod (6). An electromagnet (8) is spaced above the ferromagnetic block (7). The electromagnet (8) is fixed inside the crystallization tank (1).
2. The crystallizer scraping device as described in claim 1, characterized in that, It also includes a limiting spring (9), and the bottom of the adjusting rod (6) is connected to the horizontal blade (31) through the limiting spring (9).
3. The crystallizer scraping device as described in claim 1, characterized in that, It also includes a second adjusting blade (10), a second lever (11) and a connecting rod (12). The second adjusting blade (10) is located on the side of the horizontal blade (31) near the bottom of the crystallizing tank (1). The end of the second adjusting blade (10) near the vertical blade (32) is hinged to the horizontal blade (31) through the second lever (11). The end of the second lever (11) away from the second adjusting blade (10) is hinged to the adjusting rod (6). The end of the second adjusting blade (10) away from the vertical blade (32) is connected to the horizontal blade (31) through the connecting rod (12).
4. The crystallizer scraping device as described in claim 1, characterized in that, The electromagnet (8) is a ring shape and is coaxially arranged outside the rotating shaft and above the ferromagnetic block (7).
5. The crystallizer scraping device as described in claim 1, characterized in that, It also includes a ranging sensor (13), which is disposed on the lower surface of the electromagnet (8).
6. The crystallizer scraping device as described in claim 1, characterized in that, It also includes a first buffer layer (14), which is disposed on the side of the first adjusting knife (5) near the inner wall of the crystallizing tank (1).
7. The crystallizer scraping device as described in claim 3, characterized in that, It also includes a second buffer layer (15), which is disposed on the side of the second regulating knife (10) near the bottom of the crystallizing tank (1).
8. The crystallizer scraping device as described in claim 1, characterized in that, The surface of the electromagnet (8) is provided with a cooling jacket (16), which is connected to the cooling circulation system outside the crystallizer (1) through a pipeline.