A vertical crystallizer wall scraping mechanism

Abstract

A vertical crystallizer wall scraping mechanism, comprising a center shaft arranged in the center of the crystallizer and rotatable; an elastic scraper group fixed on the center shaft through a drag reduction support plate; the elastic scraper group comprises a fixed bottom plate and at least one group of scraper units vertically distributed on the fixed bottom plate; wherein each group of scraper units comprises: a corner support fixed seat fixed on the side surface of the fixed bottom plate; a corner support rotatably connected to one end of the corner support fixed seat; a scraper fixed on the corner support; a spring pre-tightening force mechanism arranged between the fixed bottom plate and the other end of the corner support; the vertical crystallizer wall scraping mechanism makes the scraper twist and adhere to the inner wall of the crystallizer, and the pre-tightening force of the scraper can be adjusted to ensure the stability of the scraper in the working process, the scraper and the inner wall of the crystallizer are not easy to be damaged, and the efficiency of removing crystals is high.

Description

Technical Field

[0001] This utility model relates to the field of crystallizer technology, specifically to a vertical crystallizer wall scraping mechanism. Background Technology

[0002] When a vertical scraper-type crystallizer is crystallizing, the heat exchange process takes place on the wall of the crystallizer. This area is prone to supersaturation of the solution, which can cause crystals to accumulate and form scale. If this scale is not removed in time, the overall heat transfer efficiency will drop sharply, affecting production efficiency. At the same time, if too much scale accumulates, it can cause the machine to stall and stop. Therefore, during normal operation, the crystallizer needs to be equipped with scrapers to remove the crystals and scale that accumulate on the heat exchange wall in a timely manner.

[0003] Traditional scraper assemblies typically use a fixed base combined with a spring to press the scraper against the crystallizer wall with a fixed preload, continuously removing crystals accumulated on the wall through rotation. In actual use, the cutting force causes the spring and fixed base to tilt and vibrate, easily leading to scraper breakage or detachment, affecting crystal removal efficiency. Furthermore, scrapers falling into the solution can damage downstream equipment and jeopardize the entire production line. Therefore, it is necessary to propose a vertical crystallizer wall scraping mechanism. Utility Model Content

[0004] The purpose of this invention is to provide a vertical crystallizer wall scraping mechanism that allows the scraper to twist and fit against the inner wall of the crystallizer. At the same time, the pre-tightening force of the scraper is adjustable, which can ensure the stability of the scraper under force during operation. Neither the scraper nor the inner wall of the crystallizer is easily damaged, and the efficiency of crystal removal is high.

[0005] The technical solution adopted in this utility model is: a vertical crystallizer wall scraping mechanism, comprising: The central axis is located at the center of the crystallizer and can rotate; An elastic scraper assembly is fixed to the central shaft by a drag-reducing support plate; the elastic scraper assembly includes a fixed base plate and at least one set of scraper units vertically distributed on the fixed base plate; Each scraper unit includes: A corner support fixing seat is fixed to the side of the fixing base plate; A corner support, one end of which is rotatably connected to the corner support mounting base; A scraper, which is fixed to the corner support; A spring preload mechanism is disposed between the fixed base plate and the other end of the corner support; the spring preload mechanism is configured to provide a torsional preload force to the corner support for rotation about the corner support fixing seat, so that the scraper can elastically adhere to the inner wall of the crystallizer.

[0006] As a preferred embodiment, the blades of the scrapers are axially aligned with the central axis, and the blades of all scrapers on the same fixed base plate cover the entire heat exchange zone of the inner wall of the crystallizer along the central axis.

[0007] As a preferred embodiment, at least two sets of scraper units are distributed circumferentially along the central axis.

[0008] As a preferred embodiment, the scraper is detachably connected to the corner support via a scraper pressure plate.

[0009] As a preferred embodiment, the spring preload mechanism includes a spring hinge seat, a spring, a movable joint, a spring guide rod, and a spring guide support; The spring hinge seat is fixed on the fixed base plate, and the movable joint is rotatably connected to the corner support via a shaft. One end of the spring guide rod is rotatably connected to the spring hinge seat via a shaft, and the other end of the spring guide rod is slidably engaged with the shaft hole on the movable joint. Two spring guide supports are slidably arranged on the spring guide rod between the spring hinge seat and the movable joint, and a spring is arranged between the two spring guide supports. The end of the spring guide rod is provided with a pad adjustment assembly that restricts the movable joint from disengaging and adjusts the axial position of the movable joint on the spring guide rod.

[0010] As a preferred embodiment, the pad adjustment assembly includes a limiting snap ring and at least one adjusting pad; the limiting snap ring is engaged at the end of the spring guide rod, the adjusting pad is located between the limiting snap ring and the movable joint, and / or the adjusting pad is located between the spring guide support and the movable joint.

[0011] As a preferred embodiment, the two ends of the spring guide rod are respectively provided with sliding bushings that cooperate with the spring hinge seat and the movable joint.

[0012] As a preferred option, the blade of the scraper forms an acute angle with the tangent direction of the inner wall of the crystallizer to create a scraping effect.

[0013] As a preferred option, the side of the acute angle of the scraper is the back material side.

[0014] As a preferred option, the thickness of the drag-reducing support plate on the material-facing side is less than the thickness on its material-receiving side.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. The unique linkage mechanism of the elastic scraper assembly ensures that the scraper can stably adhere to the crystallizer wall while improving the operational stability of the spring and other components. It can effectively scrape away crystals generated on the inner wall surface of the crystallizer, improve the scraper's ability to remove crystals, ensure the heat exchange efficiency and operational stability of the crystallizer, shorten the working cycle of the crystallizer, save energy, and reduce the company's operating and maintenance costs.

[0016] 2. Each flexible scraper assembly consists of multiple scraper units, which are easy to replace and better adapt to changes in the shape of the crystallizer wall, ensuring that the best crystal removal effect can be achieved in every place.

[0017] 3. The flexible scraper assembly's scrapers fit snugly against the inner wall of the crystallizer, preventing scratches on the crystallizer wall during crystal removal and effectively protecting the crystallizer.

[0018] 4. The scraper unit has a pad adjustment component. After the scraper is worn to a certain extent, it will no longer be in contact with the crystallizer to avoid scratching.

[0019] 5. The unique shape and structure of the drag-reducing support plate can reduce resistance and disturbance to the solution during operation, which is more conducive to crystallizer operation and reduces drive power. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of 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 only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an axonometric view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is an isometric view of the elastic scraper assembly in this utility model; Figure 4 This is a front view schematic diagram of the elastic scraper assembly in this utility model; Figure 5 for Figure 4 AA section view diagram; Figure 6 This is a schematic diagram of the drag-reducing support plate in this utility model; Figure 7 for Figure 2 A schematic diagram of local forces acting on the object.

[0022] Figure label: 100. Elastic scraper assembly; 101. Scraper pressure plate; 102. Scraper; 103. Corner support; 104. Corner support fixing seat; 105. Fixed base plate; 106. Spring hinge seat; 107. Spring; 108. Movable joint; 109. Adjusting pad; 110. Limiting snap ring; 111. Spring guide rod; 112. Sliding bushing; 113. Spring guide support. 200. Drag-reducing support plate; 201. Horizontal connecting plate; 202. Longitudinal connecting plate; 300. Central shaft; 301. Disc base; 302. Shaft body; 303. Connecting flange; 400. Crystallizer. Detailed Implementation

[0023] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "a," "an," or "the," etc., used in this utility model patent application specification and claims do not express a quantity limitation, but rather indicate the presence of at least one; the terms "first," "second," and "third," as used herein, should not be considered as a limitation on the order of components, but are merely for distinguishing different components; the terms "comprising" or "including," etc., indicate that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0025] To more clearly describe the specific structural composition of the wall scraping mechanism of this vertical crystallizer, in conjunction with the attached... Figure 1-7 This embodiment is described as follows: like Figure 1-4 As shown, a vertical crystallizer wall scraping mechanism includes an elastic scraper assembly 100, a drag-reducing support plate 200, and a central shaft 300. The central shaft 300 is located at the center of the crystallizer 400 and is rotatable. The elastic scraper assembly 100 is fixed to the central shaft 300 via the drag-reducing support plate 200. The elastic scraper assembly 100 includes a fixed base plate 105 and at least one set of scraper units vertically distributed on the fixed base plate 105. Each set of scraper units includes a scraper 102, a corner support 103, a corner support fixing seat 104, and an elastic scraper 102. A spring preload mechanism is included; a corner support fixing seat 104 is fixed to the side of a fixed base plate 105; one end of a corner support 103 is rotatably connected to the corner support fixing seat 104; a scraper 102 is fixed to the corner support 103; a spring preload mechanism is disposed between the fixed base plate 105 and the other end of the corner support 103; the spring preload mechanism is configured to provide a torsional preload force to the corner support 103 that rotates around the corner support fixing seat 104, so that the scraper 102 can be elastically pressed against the inner wall of the crystallizer.

[0026] During operation, the central shaft 300 and the elastic scraper assembly 100 are rotated by an external drive mechanism. The scraper 102 of the elastic scraper assembly 100 can rotate a certain angle with the corner support 103 around the corner support fixing seat 104. The preload of the scraper 102 can be adjusted by the spring preload mechanism. Under the action of the spring preload mechanism, the blade of the scraper 102 is in contact with the heat exchange zone of the inner wall of the crystallizer 400, and the crystals on the inner wall of the crystallizer 400 are scraped off with the rotation of the central shaft 300. This movement mode can ensure that the scraper 102 is in close contact with the inner wall of the crystallizer 400 while the spring compression change is more stable. The vibration or off-center load generated during the crystal removal process will also be canceled by the rotational movement of each part, and the operation of the scraper 102 and the linkage components is more stable.

[0027] See Figure 1 and Figure 2 In the above embodiments, the number of scraper units on the same elastic scraper group 100 is determined according to the size of the heat exchange zone of the crystallizer 400, and is generally not less than two. The blade of the scraper 102 of each scraper unit is along the axial direction of the central axis 300. The blades of all scrapers 102 on the same fixed base plate 105 cover the entire heat exchange zone of the inner wall of the crystallizer (the heat exchange zone is the position covered by the heat exchanger, usually in the middle section of the crystallizer) along the axial direction of the central axis 300 to ensure complete removal of crystals. Each scraper unit is independent, which can better adapt to the shape changes of the crystallizer wall and can be replaced individually after wear or damage.

[0028] The scraper unit is distributed in at least two sets along the circumference of the central axis 300. On the one hand, it helps to maintain the dynamic balance between the elastic scraper group 100 and the central axis 300 during rotation. On the other hand, it can cover each heat exchange zone of the crystallizer 400 with multiple scrapers 102, which can improve the efficiency of scraping crystals.

[0029] See Figure 2 and Figure 7 The blade of scraper 102 forms an acute angle with the tangent direction of the inner wall of the crystallizer. One side of the acute angle is the back material side (the other side is the front material side, with the front material side facing the rotation direction of the scraper and the central shaft 300). Figure 7 An example of a single scraper (with the left side facing the material back and the right side facing the material) is shown to create a scraping action, which can more effectively remove crystals adhering to the heat exchange zone of the crystallizer 400.

[0030] The scraper 102 is detachably connected to the corner support 103 and can be replaced individually when it wears down to a certain extent. For example, the corner support 103 has a limiting plate for positioning the scraper, and the scraper 102 is mounted on this limiting plate. The other side of the scraper 102 is pressed down by the scraper pressure plate 101. The scraper 102 is made of a flexible, wear-resistant polymer material, which will not damage the inner wall of the crystallizer 400 when scraping crystals.

[0031] See Figure 5 and Figure 7 The spring preload mechanism includes a spring hinge seat 106, a spring 107, a movable joint 108, a spring guide rod 111, and a spring guide support 113. The spring hinge seat 106 is fixed on the fixed base plate 105. The movable joint 108 is rotatably connected to the corner support 103 via shaft N. One end of the spring guide rod 111 is rotatably connected to the spring hinge seat 106 via shaft P. The other end of the spring guide rod 111 is slidably engaged with the shaft hole on the movable joint 108. Two spring guide supports 113 are slidably arranged on the spring guide rod 111 between the spring hinge seat 106 and the movable joint 108, and a spring 107 is arranged between the two spring guide supports 113. The end of the spring guide rod 111 is provided with a pad adjustment assembly that restricts the movable joint 108 from disengaging and adjusts the axial position of the movable joint 108 on the spring guide rod 111.

[0032] The spring preload mechanism is applied to the end of the corner support 103, causing the corner support 103 to generate a torsional tendency with the axis M of the corner support fixing seat 104 at one end as the rotation center, so that the scraper 102 on the corner support 103 abuts against the inner wall of the crystallizer 400 with a certain preload; the force applied by the scraper 102 to the inner wall of the crystallizer 400 is determined by the axial position of the movable joint 108 on the spring guide rod 111, and the thickness of the pad adjustment assembly and the cooperation of the spring 107 determine the axial position of the movable joint 108 on the spring guide rod 111; For example, the pad adjustment assembly includes a retaining spring 110 and at least one adjusting pad 109. The retaining spring 110 is engaged with the end of the spring guide rod 111. The adjusting pad 109 has two mounting positions: position 1, in which the adjusting pad 109 is mounted between the retaining spring 110 and the movable joint 108 (this mounting method is...). Figure 5 (As shown in the figure); Position 2, where the adjusting pad 109 is installed between the spring guide support 113 and the movable joint 108 (this installation method is not shown in the figure). The adjusting pad 109 can be selectively installed at position 1 or position 2, or at both positions 1 and 2.

[0033] Spring 107 is a compression spring; adjusting pad 109 is ring-shaped and can be fitted onto spring guide rod 111. Multiple adjusting pads 109 can be used in combination. The more adjusting pads 109 used, the greater the thickness of the entire pad adjusting assembly. When the thickness of the pad adjusting assembly increases, the compression of spring 107 increases and its length decreases. When adjusting pad 109 is in position 1: at this time, movable joint 108 is close to fixed base plate 105, while scraper 102 is twisted towards the inner wall of crystallizer 400. The fewer adjusting pads 109 used, the smaller the thickness of the entire pad adjusting assembly. When the thickness of the pad adjusting assembly decreases, the compression of spring 107 decreases and its length increases. At this time, movable joint 108 moves away from fixed base plate 105, while scraper 102 twists away from the inner wall of crystallizer 400, thereby adjusting the position of scraper 102. When the adjusting pad 109 is in position 2: the relative positions of components such as the movable joint 108, the fixed base plate 105, and the scraper 102 do not change. The fewer adjusting pads 109 used, the smaller the thickness of the entire pad adjusting assembly. When the thickness of the pad adjusting assembly decreases, the compression of the spring 107 decreases and its length increases. At this time, the preload of the scraper 102 decreases, and vice versa, thereby adjusting the preload of the scraper 102. The fit and preload of the scraper 102 are adjusted through the above operation.

[0034] Before using the equipment, the preload of the scraper 102 and the fit between the scraper and the inner wall of the crystallizer 400 can be adjusted by changing the number of adjusting shims 109; the usage process is as follows: Figure 7 As shown, Fa is the direction of the cutting force on the scraper, and Fb is the direction of the spring pressure. With the flexible rotation and self-adaptation of the joints M, N, and P, the force direction of the support and spring 107 can be ensured to be singular. In particular, the spring 107 is only subjected to pressure, which can ensure flexible compression and no lateral miscellaneous forces. The transmission is flexible, which can effectively remove the mechanical vibration caused by the cutting process, optimize the force situation of the spring and support, and improve the service life of the spring and support. When the scraper 102 is worn to a certain extent, the combination of the limit snap ring 110 and the adjusting pad 109 can limit the corner support 103, prevent the corner support 103 from rotating excessively along the axis M of the corner support fixing seat 104, and avoid the steel part of the corner support 103 from touching the inner wall of the crystallizer 400 and causing scratches and damage.

[0035] See Figure 5The spring guide rod 111 has sliding bushings 112 at both ends that cooperate with the spring hinge seat 106 and the movable joint 108, respectively. The sliding bushings 112 at the rotating joint can ensure the flexibility of rotation. For example, one of the sliding bushings 112 is located between the shaft hole of the spring guide rod 111 and the movable joint 108; the other sliding bushing 112 is sleeved on the convex shaft of the spring hinge seat 106, and the sliding bushing 112 is disposed in the radial shaft hole at the end of the spring guide rod 111.

[0036] See Figure 6 The thickness of the drag-reducing support plate 200 on the material-facing side is less than the thickness on its material-receiving side. Specifically, the drag-reducing support plate 200 includes a transverse connecting plate 201 and a longitudinal connecting plate 202. One end of the transverse connecting plate 201 is connected to the central shaft 300, and the other end is connected to the longitudinal connecting plate 202. The longitudinal connecting plate 202 is provided with a connecting hole for detachable connection with the elastic scraper assembly 100. The cross-section of the transverse connecting plate 201 is gradually changing, and the thickness on the material-facing side is less than the thickness on the material-receiving side, thereby reducing the resistance during operation and the disturbance to the solution, which is more conducive to the operation of the crystallizer and reduces the driving power.

[0037] See Figure 1 The central shaft 300 includes a disc base 301, a shaft body 302, and a connecting flange 303. The disc base 301 is fixed to the end of the shaft body 302 and is used to connect the power mechanism that drives its rotation. There are multiple connecting flanges 303 distributed along the axial direction of the shaft body 302. They are used to connect the fixed base plate 105 of the elastic scraper assembly 100. The multiple connecting flanges 303 can reduce drag while ensuring the stability of the elastic scraper assembly 100.

[0038] The parts not described in detail in the above embodiments are existing technologies.

[0039] It should be noted that although the present invention has been described through the above embodiments, there may be other various embodiments of the present invention. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A vertical crystallizer wall scraping mechanism, characterized in that, include: A central shaft (300) is located at the center of the crystallizer and is rotatable; An elastic scraper assembly (100) is fixed to the central shaft (300) by a drag-reducing support plate (200); the elastic scraper assembly (100) includes a fixed base plate (105) and at least one set of scraper units vertically distributed on the fixed base plate (105); Each scraper unit includes: A corner support fixing seat (104) is fixed to the side of the fixing base plate (105); A corner support (103) is rotatably connected at one end to the corner support fixing seat (104). A scraper (102) is fixed to the corner support (103); A spring preload mechanism is provided between the fixed base plate (105) and the other end of the corner support (103); the spring preload mechanism is configured to provide a torsional preload force to the corner support (103) for rotation about the corner support fixing seat (104), so that the scraper (102) can elastically adhere to the inner wall of the crystallizer.

2. The vertical crystallizer wall scraping mechanism according to claim 1, characterized in that: The blades of the scrapers (102) are along the axial direction of the central axis (300), and the blades of all the scrapers (102) on the same fixed base plate (105) cover the entire heat exchange zone of the inner wall of the crystallizer along the axial direction of the central axis (300).

3. The vertical crystallizer wall scraping mechanism according to claim 1, characterized in that: There are at least two sets of scraper units distributed circumferentially along the central axis (300).

4. The vertical crystallizer wall scraping mechanism according to claim 1, characterized in that: The scraper (102) is detachably connected to the corner support (103) via the scraper pressure plate (101).

5. A vertical crystallizer wall scraping mechanism according to claim 1, characterized in that: The spring preload mechanism includes a spring hinge seat (106), a spring (107), a movable joint (108), a spring guide rod (111), and a spring guide support (113). The spring hinge seat (106) is fixed on the fixed base plate (105), the movable joint (108) is rotatably connected to the corner support (103) via a shaft, one end of the spring guide rod (111) is rotatably connected to the spring hinge seat (106) via a shaft, and the other end of the spring guide rod (111) is slidably engaged with the shaft hole on the movable joint (108). Two spring guide supports (113) are slidably arranged on the spring guide rod (111) between the spring hinge seat (106) and the movable joint (108), and a spring (107) is arranged between the two spring guide supports (113). The end of the spring guide rod (111) is provided with a pad adjustment assembly that restricts the movable joint (108) from disengaging and adjusts the axial position of the movable joint (108) on the spring guide rod (111).

6. A vertical crystallizer wall scraping mechanism according to claim 5, characterized in that: The pad adjustment assembly includes a limiting snap ring (110) and at least one adjusting pad (109), the limiting snap ring (110) being engaged at the end of the spring guide rod (111); The adjusting pad (109) is located between the limiting snap ring (110) and the movable joint (108), and / or the adjusting pad (109) is located between the spring guide support (113) and the movable joint (108).

7. A vertical crystallizer wall scraping mechanism according to claim 5, characterized in that: The spring guide rod (111) has sliding bushings (112) at both ends that cooperate with the spring hinge seat (106) and the movable joint (108).

8. A vertical crystallizer wall scraping mechanism according to claim 1, characterized in that: The blade of the scraper (102) forms an acute angle with the tangential direction of the inner wall of the crystallizer to create a scraping effect.

9. A vertical crystallizer wall scraping mechanism according to claim 1, characterized in that: The acute angle of the scraper (102) is on the back side.

10. A vertical crystallizer wall scraping mechanism according to claim 1, characterized in that: The thickness of the drag-reducing support plate (200) on the material-facing side is less than the thickness on its material-receiving side.

Images