A pit liquid level switch for pulp and paper making

Abstract

The utility model discloses a pit liquid level switch for pulping papermaking, including the float ball of installation in the pit, high liquid level proximity switch, low liquid level switch and fixed link, both ends of fixed link are fixed in pit one side through crosspiece, the through -hole of passing through float ball is equipped with in the float ball center position, and is through the through -hole and is equipped on fixed link, and high liquid level proximity switch and low liquid level switch are fixed in pit respectively near the upper and lower ends of one side of float ball, and the inside of float ball, high liquid level proximity switch and low liquid level switch all are equipped with magnetic element. The proximity switch and float ball of the utility model all adopt corrosion -resistant material, not only can long -term work in the harsh environment, and can resist the corrosion of liquid in pit, through the float ball and moves with liquid level ascending or descending, triggers corresponding proximity switch to control the start -stop of submersible pump, realizes the automation control, reduces manual intervention, improves work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of liquid level measurement technology, specifically to a sump liquid level switch for pulp and paper making. Background Technology

[0002] In pulp and paper manufacturing projects, pits are typically used to collect wastewater, pulp, or other liquids. Due to the large fluctuations in pit levels, manual monitoring is difficult. Therefore, automated level control systems are crucial for ensuring production continuity and safety, especially for high-power process pumps. Excessively high or low levels can damage equipment or even halt production. Current level control technologies often employ ultrasonic level gauges, radar level gauges, or float switches. However, these technologies have limitations in the high-temperature and high-humidity environment of pulp and paper pits. Ultrasonic level gauges are susceptible to moisture interference, leading to inaccurate measurements. While radar level gauges offer high accuracy, they are also expensive. Float switches are prone to jamming due to corrosion or dirt, affecting measurement stability. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a sump level switch for pulping and papermaking to solve the technical problems mentioned in the background.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sump level switch for pulping and papermaking, comprising a float, a high level proximity switch, a low level switch, and a fixing rod installed in the sump. The upper and lower ends of the fixing rod are fixed to one side of the sump via crossbars. The float has a through hole at its center and is fitted onto the fixing rod through the through hole. The high level proximity switch and the low level switch are respectively fixed to the upper and lower ends of the sump near the float. The float, the high level proximity switch, and the low level switch all have magnetic elements inside.

[0005] Furthermore, the housings of the float, high-level proximity switch, and low-level switch are all made of stainless steel or engineering plastics.

[0006] Preferably, the high-level proximity switch and the low-level switch are respectively connected to the DCS control system via cables, and the DCS controller is connected to the submersible pump via a cable.

[0007] In summary, the present invention has the following main advantages:

[0008] The proximity switch and float of this invention are both made of corrosion-resistant materials, which can not only work for a long time in harsh environments, but also resist the corrosion of liquid in the pit. By moving the float as the liquid level rises or falls, the corresponding proximity switch is triggered, thereby controlling the start and stop of the submersible pump, realizing automated control, reducing manual intervention and improving work efficiency. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a circuit block diagram of the present invention. Detailed Implementation

[0011] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0012] The embodiments of this utility model will be described below based on its overall structure.

[0013] like Figure 1 , Figure 2 As shown, this utility model includes a float 1, a high liquid level proximity switch 2, a low liquid level switch 3, and a fixing rod 4 installed in a pit. The upper and lower ends of the fixing rod 4 are fixed to one side of the pit by a crossbar 5. The fixing rod 4 and the crossbar 5 are both made of stainless steel. The float 1 has a through hole in the center and is sleeved on the fixing rod 4 through the through hole. The high liquid level proximity switch 2 and the low liquid level switch 3 are respectively fixed to the upper and lower ends of the side of the pit near the float 1. The float 1, the high liquid level proximity switch 2, and the low liquid level switch 3 are all equipped with magnetic elements. The float 1 floats on the liquid surface and can move up and down with the rise or fall of the liquid level.

[0014] The housings of the float 1, high level proximity switch 2, and low level switch 3 of this utility model are all made of stainless steel or engineering plastic, which can effectively resist acid and alkali corrosion and are suitable for the corrosive environment of the pulp and paper industry. In order to prevent liquid from seeping into the proximity switch and its electrical components, the housings of the high level proximity switch 2 and the low level switch 3 are sealed with silicone rubber or fluororubber to ensure that the waterproof performance of the level switch reaches the IP68 level.

[0015] like Figure 2As shown, the high-level proximity switch 2 and the low-level switch 3 are connected to the DCS controller 6 via cables, and the DCS controller 6 is connected to the submersible pump 7 via cables. When the liquid in the pit decreases and the float 1 approaches the low-level switch 3, the magnetic element inside the float 1 triggers the magnetic element inside the low-level switch 3, causing the low-level switch 3 to send a low-level signal to the DCS controller 6. This causes the DCS controller 6 to send a signal to the submersible pump 7, shutting it off. When the liquid in the pit rises and the float 1 approaches the high-level proximity switch 2, the principle is the same as triggering the low-level switch 3. The DCS controller 6 sends a signal to the submersible pump 7, turning it on. This achieves automated control, reduces manual intervention, and improves work efficiency.

[0016] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A sump level switch for pulp and paper making, characterized in that, The device includes a float, a high-level proximity switch, a low-level switch, and a fixing rod installed in a pit. The upper and lower ends of the fixing rod are fixed to one side of the pit by crossbars. The float has a through hole at its center and is fitted onto the fixing rod through the through hole. The high-level proximity switch and the low-level switch are fixed to the upper and lower ends of the side of the pit near the float, respectively. The float, the high-level proximity switch, and the low-level switch all have magnetic elements inside.

2. The sump level switch for pulp and paper making according to claim 1, characterized in that: The housings of the float, high-level proximity switch, and low-level switch are all made of stainless steel or engineering plastic.

3. A sump level switch for pulp and paper making according to claim 2, characterized in that: The high-level proximity switch and the low-level switch are respectively connected to the DCS controller via cables, and the DCS controller is connected to the submersible pump via cables.

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