Pulper structure

Abstract

According to the pulper structure provided by the utility model, the pulper structure is improved, so that the accuracy and the stability of pulp liquid level measurement are obviously improved. The pulper structure comprises a tank body and a cover body covering the tank body, a stirring device is further arranged at the bottom of the tank body and rotates around a stirring axis, and the stirring axis extends in the vertical direction; the cover body is provided with a radar liquid level detection device, the radar liquid level detection device can emit radar beams, and the radar beams form a detection range at the tank bottom; the stirring device is projected in the vertical direction to form a first projection area at the tank bottom, the tank body is projected to form a second projection area on the surface where the tank bottom is located, and the detection range is located between the first projection area and the second projection area; and the first projection area and the second projection area are separated from each other.

Description

Technical Field

[0001] This utility model relates to the field of pulp preparation technology, specifically to a pulper structure. Background Technology

[0002] In the slurry preparation industry, accurate measurement of material levels is crucial for ensuring stable and efficient production. Differential pressure diaphragm transmitters are widely used in this field to measure liquid levels. Their working principle is based on the linear relationship between the pressure generated by the liquid column and the liquid level. By measuring the pressure difference between two different locations within the container, the liquid level can be calculated, thus enabling monitoring of the material level.

[0003] However, when handling high-viscosity semi-solid materials, the extremely high viscosity of the material causes the bottom agitator to strongly compress the differential pressure diaphragm. This compression not only fails to accurately reflect the true material level within the container but may also distort the liquid level measurement, making it difficult to control the liquid level in the agitated container.

[0004] This inaccurate measurement has a significant negative impact on subsequent feeding steps and the execution of sequential control logic, failing to meet the high-precision requirements of process control. Particularly in slurry preparation processes where precise control of material ratios and reaction times is necessary, fluctuations in liquid level can lead to decreased product quality and even production accidents.

[0005] Furthermore, as a contact-type liquid level measurement device, the differential pressure diaphragm transmitter is susceptible to mechanical wear from high-viscosity semi-solid materials. Over long-term operation, this wear not only exacerbates measurement errors but also shortens the equipment's lifespan and reduces the reliability and stability of the measurement. Utility Model Content

[0006] The purpose of this invention is to provide a pulper structure that significantly improves the accuracy and stability of pulp level measurement by modifying the pulper structure.

[0007] To achieve the above objectives, this utility model provides a pulper structure, including a tank and a cover covering the tank. A stirring device is also provided at the bottom of the tank, the stirring device rotating around a stirring axis, and the stirring axis extending vertically.

[0008] The cover is equipped with a radar liquid level detection device, which can emit a radar beam, and the radar beam forms a detection range at the bottom of the tank.

[0009] The stirring device is projected vertically to form a first projection area on the bottom of the tank, and the tank body is projected to form a second projection area on the surface where the bottom of the tank is located. The detection range is located between the first projection area and the second projection area, and is spaced apart from the first projection area and the second projection area.

[0010] By placing the radar level detection device within the cover, direct contact between the radar level detection device and the slurry is avoided, thus ensuring the accuracy of the test results. Furthermore, wear is prevented, increasing the equipment's lifespan and improving the reliability and stability of the measurement. Additionally, the radar beam of the radar level detection device will not contact the inner side of the tank or the stirring device in its extension direction, thereby avoiding interference with the slurry level measurement results. Moreover, the method described in this application allows for more precise measurement of the level of solid slurry.

[0011] Optionally, the system further includes several vertically extending reinforcing ribs, which are circumferentially arranged on the inner wall of the tank. The reinforcing ribs are projected vertically to form a third projection area on the bottom of the tank, and the detection range is spaced apart from the third projection area. By providing reinforcing ribs, the tank's load-bearing capacity for slurry is improved. Furthermore, by spacing the detection range from the third projection area, interference between the reinforcing ribs and the radar level detection device is avoided.

[0012] Optionally, in the circumferential direction, the detection range is located between two adjacent third projection areas. This arrangement ensures that the radar level detection device and the reinforcing ribs are staggered circumferentially, thus preventing the radar level detection device from occupying radial space within the tank and consequently increasing the overall space occupied by the tank.

[0013] Optionally, the system also includes a scraping device that rotates around the stirring axis and is positioned at and in contact with the bottom of the tank. Vertically, the stirring device is located on the side of the scraping device away from the bottom of the tank. The scraping device is projected vertically to form a fourth projection area on the bottom of the tank. The detection range at least partially overlaps with the fourth projection area. The scraping device at the bottom of the tank performs a scraping operation on the slurry to facilitate its discharge from the tank. By ensuring that the fourth projection area at least partially overlaps with the detection range, accurate measurement of the slurry level is guaranteed, and the utilization rate of the space within the tank is increased.

[0014] Optionally, the tank includes a constant-diameter section and a reduced-diameter section. The constant-diameter section connects to the cover, and the reduced-diameter section connects to the side of the constant-diameter section away from the cover and connects to the bottom of the tank. Vertically, from top to bottom, the radial dimension of the reduced-diameter section gradually decreases from the side where the constant-diameter section is located to the side where the bottom of the tank is located. The bottom of the reduced-diameter section forms the innermost edge of the second projection area, and the detection range is spaced apart from the innermost edge of the second projection area. This avoids slurry accumulation in parts of the tank, and by setting the reduced-diameter section, it guides the slurry during unloading while preventing interference with the radar beam of the radar level detection device.

[0015] Optionally, the lower surface of the reinforcing rib is vertically pressed against the inner wall of the reduced diameter section. This further strengthens the structural strength of the tank.

[0016] Optionally, the cover is a frustum structure, the frustum surface is flat, the sidewalls are sloping, and the radial dimension of the sidewalls gradually increases from the side containing the frustum surface towards the side containing the tank. The radar level detection device is disposed on the frustum surface. By disposing the radar level detection device on the frustum surface, it can measure the slurry even when the tank is full of slurry, as it is located at the opening of the tank in the vertical direction, without coming into contact with the slurry.

[0017] Optionally, the stirring axis passes through the center of the platform. This ensures the stability of the tank.

[0018] Optionally, the stirring axis passes through the center of the tank bottom. This ensures the stability of the tank.

[0019] Optionally, the radar beam emission angle of the radar level detection device is 3° to 7°. This maximizes the utilization of the space within the tank.

[0020] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0022] Figure 1 This is a partial side sectional view of the pulper structure in an embodiment of this utility model;

[0023] Figure 2 yes Figure 1 Top view;

[0024] Figure 3 This is a partial projection diagram of the pulper structure in an embodiment of this utility model.

[0025] Figure label:

[0026] 1-Tank body; 11-Equal diameter section; 12-Reduced diameter section; 13-Second projection area; 2-Cover body; 21-Tabletop; 3-Stirring device; 31-Stirring blade; 32-Support rod; 33-First projection area; 4-Radar liquid level detection device; 41-Detection range; 5-Reinforcing rib; 51-Third projection area; 6-Scraping device; 61-Fourth projection area; 62-Scraping plate. Detailed Implementation

[0027] This invention provides a pulper structure that significantly improves the accuracy and stability of pulp level measurement through structural improvements.

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0030] Please refer to Figure 1 and Figure 3 , Figure 1 This is a partial side sectional view of the pulper structure in an embodiment of this utility model; Figure 2 yes Figure 1 Top view; Figure 3 This is a partial projection diagram of the pulper structure in an embodiment of this utility model.

[0031] This utility model provides a pulper structure, including a tank 1 and a cover 2 covering the tank 1. A stirring device 3 is also provided at the bottom of the tank, rotating around a stirring axis p1, which extends vertically. The stirring device 3 includes stirring blades 31, which can be horizontally extending (i.e., planar blades), with several blades 31 vertically distributed, arranged circumferentially at the same vertical height; or, as shown in the figure, the stirring device 3 includes a support rod 32 extending vertically, with the stirring axis p1 vertically passing through the center of the support rod 32. The stirring blades 31 extend vertically spirally around the outer wall of the support rod 32, with several blades 31 distributed circumferentially around the support rod 32.

[0032] Optionally, the stirring axis p1 passes through the center of the platform 21. This ensures the stability of the tank 1. Optionally, the stirring axis p1 passes through the center of the tank bottom. This also ensures the stability of the tank 1. In this configuration, the tank bottom is circular, and the center of the circular tank bottom is the center of the tank bottom itself. That is, the platform 21, the tank bottom, and the support rod 32 are coaxially arranged.

[0033] In the technical solution of this application, the cover 2 is equipped with a radar level detection device 4, which can emit a radar beam, forming a detection range 41 at the bottom of the tank. The radar level detection device 4 is a level measuring instrument based on radar technology; its structure is not the focus of this application. The radar level detection device 4 is positioned on the cover 2 to avoid contact with the slurry. Specifically, the cover 2 has a mounting hole, the wall of which abuts against the outer wall of the radar level detection device 4 to form an airtight fit.

[0034] The stirring device 3 is projected vertically to form a first projection area 33 on the bottom of the tank, and the tank body 1 is projected to form a second projection area 13 on the surface where the bottom of the tank is located. The detection range 41 is located between the first projection area 33 and the second projection area 13, and is spaced apart from the first projection area 33 and the second projection area 13.

[0035] By placing the radar level detection device 4 on the cover 2, direct contact between the radar level detection device 4 and the slurry is avoided, thus ensuring the accuracy of the test results. In addition, wear is avoided, increasing the service life of the equipment and improving the reliability and stability of the measurement. Furthermore, the radar beam of the radar level detection device 4 will not contact the inner side of the tank 1 or the stirring device 3 in its extension direction, thus avoiding interference with the measurement results of the slurry level. Moreover, by adopting the method of this application, the level of solid slurry can be measured more accurately.

[0036] Optionally, the device also includes a plurality of vertically extending reinforcing ribs 5, which are arranged circumferentially on the inner wall of the tank body 1. The reinforcing ribs 5 are evenly distributed vertically along the tank body 1, and their number can be four or six, or other numbers, all of which are within the scope of protection of this application.

[0037] The reinforcing rib 5 is projected vertically to form a third projection area 51 on the bottom of the tank. The detection range 41 is spaced apart from the third projection area 51. The third projection area 51 extends at least partially beyond the inner edge of the second projection area 13 in the radial direction, or coincides with the second projection area 13. The case where the third projection area 51 coincides with the second projection area 13 will be explained in detail below. Here, "inner" is defined with the center of the tank 1 as the reference. The side of the tank 1 that points radially toward its center is inner, and the opposite side is outer.

[0038] By setting the reinforcing ribs 5, the load-bearing capacity of the tank 1 for slurry is improved. By spacing the detection range 41 and the third projection area 51, interference of the reinforcing ribs 5 with the radar level detection device 4 can be avoided.

[0039] In the technical solution of this application, as an optional form, the detection range 41 is located between two adjacent third projection areas 51 in the circumferential direction. However, as shown in the figure, the radial dimension of the reinforcing rib 5 from the center of the groove 1 is greater than the radial dimension of the detection range 41 from the center of the groove 1.

[0040] In this way, the radar level detection device 4 and the reinforcing rib 5 are staggered in the circumferential direction, thereby avoiding the radar level detection device 4 occupying the radial space of the tank body 1, which would cause the space occupied by the tank body 1 to increase.

[0041] In some alternative embodiments, the pulper structure also includes a scraper device 6, which also rotates about the stirring axis p1. In the example shown, the scraper device 6 includes a scraper plate 62, which is integrated into the aforementioned support rod 32 and located below the stirring blades 31. The scraper plate 62 is vertically abutted against the tank body 1, and during its rotation, it can push the pulp at the bottom of the tank by generating friction with the bottom of the tank in the direction of its rotation.

[0042] Specifically, in this embodiment, the scraping device 6 is disposed at the bottom of the tank and in contact with the bottom of the tank. Vertically, the stirring device 3 is located on the side of the scraping device 6 away from the bottom of the tank. The scraping device 6 is projected vertically to form a fourth projection area 61 on the bottom of the tank. The detection range 41 at least partially overlaps with the fourth projection area 61. The fourth projection area 61 is the projection of the scraper plate 62 onto the bottom of the tank. That is, at least a portion of the scraper plate 62 in its extending direction overlaps with the detection range 41.

[0043] The scraping device 6 is set at the bottom of the tank to scrape the slurry at the bottom of the tank so that the slurry can be discharged from the tank 1. By having at least a partial overlap between the fourth projection area 61 and the detection range 41, it can not only ensure the accurate measurement of the slurry level, but also increase the utilization rate of the space inside the tank 1.

[0044] The following is an example of the structure of the tank 1 in this application. In addition to the embodiments detailed in this application, other embodiments are also within the protection scope of this application.

[0045] In the example shown, the tank 1 includes a constant-diameter section 11 and a narrowed-diameter section 12. The constant-diameter section 11 maintains a consistent radial dimension in the vertical direction. The constant-diameter section 11 is used to connect to the cover 2, and the narrowed-diameter section 12 is connected to the side of the constant-diameter section 11 away from the cover 2 and connects to the bottom of the tank. Vertically, from top to bottom, the radial dimension of the narrowed-diameter section 12 gradually decreases from the side where the constant-diameter section 11 is located to the side where the bottom of the tank is located. As a result, the slurry adhering to the constant-diameter section 11 can slide down to the narrowed-diameter section 12 and further flow into the bottom of the tank under the guidance of the necked-off section.

[0046] The bottom of the narrowed section 12 forms the innermost edge of the second projection area 13, and the detection range 41 is spaced apart from the innermost edge of the second projection area 13. This prevents slurry from accumulating in part of the tank 1. By setting the narrowed section 12, the slurry is guided during unloading, while interference with the radar beam of the radar level detection device 4 is avoided.

[0047] In the aforementioned scheme, the lower surface of the reinforcing rib 5 presses vertically against the inner wall of the narrowed section 12. This further strengthens the structural strength of the tank 1. It also prevents material from accumulating between the two reinforcing ribs 5 and avoids the reinforcing ribs 5 further occupying space within the tank 1.

[0048] As an alternative, the cover 2 is a frustum structure, with the frustum surface 21 being a flat surface that extends higher than the top of the tank 1 in the vertical direction. The sidewalls of the frustum structure are sloping, and their radial dimension gradually increases from the side containing the frustum surface 21 towards the side containing the tank 1. The radar level detection device 4 is mounted on the frustum surface 21. By mounting the radar level detection device 4 on the frustum surface 21, it can measure the slurry even when the tank 1 is filled with slurry, without coming into contact with the slurry, even at the opening of the tank 1 in the vertical direction.

[0049] In the above embodiment, the radar beam emission angle of the radar level detection device 4 is 3° to 7°. This maximizes the utilization of the space within the tank 1.

[0050] By employing a radar level detection device 4 with a radar beam emission angle within the aforementioned range, the focusing capability of the radar level detection device 4 can be significantly improved.

[0051] The following two more detailed embodiments further illustrate the technical solution of this application. It should be noted that these two embodiments are for illustrative purposes only and are not intended to limit the scope of the technical solution of this application. Those skilled in the art can combine the following two embodiments with the previous embodiments in part or in whole, and all technical solutions derived from such combinations fall within the protection scope of this patent.

[0052] Example 1

[0053] In this embodiment, the radial distance between the innermost edge of the second projection area 13 and the outermost edge of the first projection area 33 is defined as s1. On the cover 2, the radial distance between the position of the radar liquid level detection device 4 on the cover 2 and the outermost edge of the first projection area 33 is 1 / 2s1.

[0054] For example, if s1 is 959mm, then the distance between the radar liquid level detection device 4 and the outermost edge of the first projection area 33 is approximately 480mm.

[0055] Example 2

[0056] The detection range 41 needs to avoid the third projection area 51. In the example shown, the inner wall of the tank 1 is provided with four reinforcing ribs 5, the angle between two adjacent reinforcing ribs 5 is 90°, and the angle between the detection range 41 and the two adjacent reinforcing ribs 5 is 45°. Of course, other angle ranges are also possible, all of which are within the protection scope of this patent.

[0057] Compared with existing technologies, the advantages of this application are:

[0058] First, it has high measurement accuracy and stability, enabling precise measurements at the millimeter level, making it suitable for applications with high requirements for material level.

[0059] Secondly, the radar level detection device 4 also has good anti-interference capabilities and can operate stably in complex industrial environments. By adopting the deployment position of the radar level detection device 4 in this application, both measurement accuracy and long-term stability of the equipment and low maintenance costs can be guaranteed.

[0060] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A pulper structure, characterized in that, It includes a tank (1) and a cover (2) covering the tank (1). A stirring device (3) is also provided at the bottom of the tank. The stirring device (3) rotates around the stirring axis (p1), which extends vertically. The cover (2) is equipped with a radar liquid level detection device (4), which is capable of emitting a radar beam, and the radar beam forms a detection range (41) at the bottom of the tank. The stirring device (3) is projected vertically to form a first projection area (33) on the bottom of the tank, and the tank body (1) is projected to form a second projection area (13) on the surface where the bottom of the tank is located. The detection range (41) is located between the first projection area (33) and the second projection area (13), and is spaced apart from the first projection area (33) and the second projection area (13).

2. The pulper structure according to claim 1, characterized in that, It also includes several vertically extending reinforcing ribs (5), which are arranged circumferentially on the inner wall of the groove (1); The reinforcing rib (5) is projected vertically to form a third projection area (51) at the bottom of the groove, and the detection range (41) is spaced apart from the third projection area (51).

3. The pulper structure according to claim 2, characterized in that, In the circumferential direction, the detection range (41) is located between two adjacent third projection regions (51).

4. The pulper structure according to claim 2, characterized in that, It also includes a scraping device (6), which also rotates around the stirring axis (p1), the scraping device (6) is in contact with the bottom of the tank, and the stirring device (3) is located on the side of the scraping device (6) away from the bottom of the tank; The scraper (6) is projected vertically to form a fourth projection area (61) at the bottom of the trough; The detection range (41) at least partially overlaps with the fourth projection area (61).

5. The pulper structure according to claim 2, characterized in that, The groove (1) includes a constant diameter section (11) and a reduced diameter section (12). The constant diameter section (11) is used to connect with the cover (2). The reduced diameter section (12) is connected to the side of the constant diameter section (11) away from the cover (2) and is connected to the bottom of the groove. Vertically from top to bottom, the radial dimension of the tapered section (12) gradually decreases from the side where the equal diameter section (11) is located to the side where the bottom of the groove is located; The bottom of the reduced diameter section (12) forms the innermost edge of the second projection region (13).

6. The pulper structure according to claim 5, characterized in that, The lower surface of the reinforcing rib (5) is pressed vertically against the inner wall of the reduced diameter section (12).

7. The pulper structure according to any one of claims 1-6, characterized in that, The cover (2) is a frustum structure, the frustum surface (21) is a plane, the side wall of the frustum structure is a slope, and the radial dimension of the side wall of the frustum structure gradually expands from the side where the frustum surface (21) is located to the side where the groove (1) is located. The radar liquid level detection device (4) is mounted on the platform (21).

8. The pulper structure according to claim 7, characterized in that, The stirring axis (p1) passes through the center of the platform (21).

9. The pulper structure according to any one of claims 1-6, characterized in that, The stirring axis (p1) passes through the center of the tank bottom.

10. The pulper structure according to any one of claims 1-6, characterized in that, The radar beam emission angle of the radar level detection device (4) is 3° to 7°.

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