Start-stop system for automatic cleaning of bell jar of reduction furnace

Abstract

The utility model discloses a start-stop system for automatic cleaning of a bell jar of a reduction furnace, which belongs to the technical field of reduction furnace monitoring systems and comprises a control cabinet, a high-pressure pump, a photoelectric sensor mounted beside the bell jar and used for detecting the bell jar, and a gravity sensor mounted below an operating platform and used for detecting stress of the operating platform. The control cabinet is in control connection with the photoelectric sensor, the gravity sensor and the high-pressure pump, and the problems that in the prior art, an automatic control mode in a bell jar cleaning system is started by mistake, so that the whole cleaning system operates unstably, the working environment is affected, and potential safety hazards exist are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of reduction furnace monitoring systems, and particularly relates to a start-stop system for automatically cleaning the bell cover of a reduction furnace. Background Technique

[0002] In the production of polysilicon, the cleaning of the bell cover of the reduction furnace is involved. For example, the utility model patent with the application number "CN213079443U" and the name "A cleaning system for a polysilicon reduction furnace" disclosed on April 30, 2021 proposed a cleaning method for cleaning the bell cover of the reduction furnace. During the whole process, the lifting and lowering of the bell cover are involved many times, and the whole bell cover weighs 30 - 40 tons. Generally, the lifting and lowering operation of the bell cover needs to be realized with the assistance of a lifting tool. When cleaning, it is necessary to lower the bell cover onto the operation platform before starting to clean the bell cover with cleaning liquids such as lye. With the continuous development of technology, this part of the work has gradually become more automated to reduce the labor intensity of workers. In the control logic of the existing cleaning system, the safety guarantee of the automatic control mode is that the PLC automatic mode is allowed to start only after the photoelectric sensor senses the bell cover of the reduction furnace. However, it is found after implementation that when this photoelectric sensor senses a person or other objects, it will also cause the PLC automatic mode to start, resulting in misjudgment.

[0003] The cleaning of the bell cover of the reduction furnace is carried out by the high-pressure hydraulic scouring of the plunger pump. The outlet pressure of the plunger pump is usually 8 - 18 MPa. In case of misjudgment, once the PLC automatic mode starts, the water pressurized by the plunger pump is like a cutter, instantly causing great scouring to the surface of the surrounding equipment, resulting in unnecessary losses and potential safety hazards at the same time. Content of the Utility Model

[0004] The utility model aims to solve the problem that in the existing bell cover cleaning system, the automatic control mode starts misoperatively, making the whole cleaning system operate unstably, affecting the working environment and having potential safety hazards.

[0005] In order to achieve the above-mentioned invention purpose, the technical solution of the utility model is as follows:

[0006] A start-stop system for automatically cleaning the bell cover of a reduction furnace includes a control cabinet, a high-pressure pump, a photoelectric sensor installed beside the bell cover for detecting the bell cover, and a gravity sensor installed below the operation platform for detecting the force borne by the operation platform. The control cabinet is respectively connected to the photoelectric sensor, the gravity sensor, and the high-pressure pump for control.

[0007] Furthermore, the distance between the photoelectric sensor and the bell cover is 100 - 1500 mm, the installation height is 800 - 1000 mm from the reduction furnace base, and the light-sensing radiation angle of the photoelectric sensor is 20 - 60°.

[0008] Further, there are 2 to 5 gravity sensors, and all the gravity sensors are evenly distributed below the operation platform with the central axis of the bell jar as the center.

[0009] Further, the measuring range of the gravity sensor is not less than 30t.

[0010] Further, the control cabinet is a PLC control cabinet.

[0011] The beneficial effects of the present utility model are as follows:

[0012] First, in the present utility model, two sensors, namely, a photoelectric sensor and a gravity sensor, are used to monitor the state of the reduction furnace bell jar, and double start limiting conditions can be adopted to ensure safety and reduce the probability of generating errors.

[0013] Second, in the present utility model, a preferred selection of the photoelectric sensor and the gravity sensor, as well as the installation requirements of the photoelectric sensor and the gravity sensor, are proposed to ensure the reliability of the information collected by the photoelectric sensor and guarantee the reliability of the automatic operation of the system.

[0014] Third, in the present utility model, multiple gravity sensors can be designed. Considering the reliability of the detection results and economy, 2 to 5 are preferred, and they are evenly distributed below the operation platform with the central axis of the bell jar as the center. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present utility model.

[0016] Figure 2 is a diagram showing the distribution of gravity sensors in another embodiment.

[0017] Figure 3 is a schematic structural diagram of another embodiment of the start-stop system for automatic cleaning of the reduction furnace bell jar.

[0018] Among them, 1. Control cabinet; 2. High-pressure pump; 3. Bell jar; 4. Photoelectric sensor; 5. Operation platform; 6. Gravity sensor; 7. Reduction furnace base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further describes the present utility model in detail with reference to the embodiments, but the embodiments of the present utility model are not limited thereto.

[0020] Embodiment 1

[0021] A start-stop system for automatic cleaning of a reduction furnace bell jar includes a control cabinet 1, a high-pressure pump 2, a photoelectric sensor 4 installed beside the bell jar 3 for detecting the bell jar 3, and a gravity sensor 6 installed below the operation platform 5 for detecting the force on the operation platform 5. The control cabinet 1 is respectively connected to the photoelectric sensor 4, the gravity sensor 6, and the high-pressure pump 2 for control.

[0022] Preferably, the control cabinet 1 is a PLC control cabinet.

[0023] Example 2

[0024] This example is a further optimization based on Example 1. The difference is that

[0025] The distance between the photoelectric sensor 4 and the bell jar 3 is preferably controlled within 100 - 1500 mm. The installation height of the photoelectric sensor 4 is preferably 7800 - 1000 mm from the reduction furnace base. The light sensing radiation angle of the photoelectric sensor 4 is preferably 20 - 60°.

[0026] Example 3

[0027] Compared with Examples 1 - 2, the difference in this example is that

[0028] There are 2 - 5 gravity sensors 6, and all the gravity sensors 6 are evenly distributed under the operation platform 5 with the central axis of the bell jar 3 as the center.

[0029] Preferably, the measuring range of the gravity sensor 6 is not less than 30 t.

[0030] Example 4

[0031] To facilitate the public's understanding of this solution, this example takes a bell jar with a weight of 30 tons in our company as an example for further illustration. The height of the bell jar 3 is about 4 m.

[0032] An automatic start - stop system for cleaning the reduction furnace bell jar includes a control cabinet 1, a high - pressure pump 2, a photoelectric sensor 4 installed beside the bell jar 3 for detecting the bell jar 3, and a gravity sensor 6 installed under the operation platform 5 for detecting the force on the operation platform 5. Refer to Figure 3 , the control cabinet 1 is respectively connected to the photoelectric sensor 4, the gravity sensor 6, and the high - pressure pump 2 for control. The control cabinet 1 is a PLC control cabinet 1. The high - pressure pump 2 is a plunger pump, and the outlet pressure of the plunger pump is generally 8 - 18 MPa.

[0033] In this example, the distance between the photoelectric sensor 4 and the bell jar 3 is 1000 mm, the installation height of the photoelectric sensor 4 is 1000 mm from the surface of the reduction furnace base 7, the light sensing radiation angle of the photoelectric sensor 4 is set to 60°, and the reflection travel of the photoelectric sensor 4 is 1000 - 1400 mm.

[0034] In this example, there are 4 gravity sensors 6, and all the gravity sensors 6 are evenly distributed under the operation platform 5 with the central axis of the bell jar 3 as the center. Refer to Figure 2 .

[0035] In this example, the measuring range of the gravity sensor 6 is 30 t.

[0036] During use, refer to Figure 3 , in this system, it is set that the control cabinet 1 receives the signals of three positions X1, X2, and X3 feedback by the photoelectric sensor 4 at the same time, and prompts that the bell jar is detected. At the same time, when the weight feedback by the gravity sensor 6 reaches 10 tons, the control cabinet 1 then controls the high-pressure pump 2 to start, that is, the automatic control mode of the bell jar 3 cleaning system is turned on, and the automatic cleaning starts. In this system, the photoelectric sensor 4 is adjusted to detect the states of three positions X1, X2, and X3, and the signals are fed back to the control cabinet 1; the gravity sensor 6 also uploads the collected signals to the control cabinet 1. The control cabinet 1 determines to start / stop the high-pressure pump 2 according to the feedback signals, that is, the automatic control mode of the bell jar cleaning system is turned on, and the automatic cleaning starts. Among them, the high-pressure pump 2 is preferably a high-pressure plunger pump. This system uses two sensors in combination to realize the opening and closing of the automatic control mode of the bell jar cleaning system. The photoelectric sensor 4 is more sensitive in detection, more timely in feedback, and more convenient in installation than the gravity sensor 6. However, the photoelectric sensor 4 has a greater probability of misjudgment and is more prone to failure. The installation of the gravity sensor 6 is more complicated. If the gravity sensor 6 fails, it is very difficult to replace / repair the equipment. Therefore, considering using the two sensors in combination to avoid the mis-start of the high-pressure pump 2 to the greatest extent. On the other hand, the gravity sensor 6 can also indirectly reflect whether the photoelectric sensor 4 is operating normally (for example, when the detection result of the gravity sensor 6 reflects that the bell jar 3 has been placed on the operation platform 5, but the photoelectric sensor 4 does not feedback the corresponding information of the bell jar 3. At this time, it is very likely that the photoelectric sensor 4 has a fault, prompting the staff to repair / replace it).

Claims

1. A start-stop system for automatic cleaning of a reduction furnace bell, characterized in that: The invention comprises a control cabinet (1) and a high-pressure pump (2), a photoelectric sensor (4) installed beside the bell housing (3) for detecting the bell housing (3), and a gravity sensor (6) installed below the operating platform (5) for detecting the force applied to the operating platform (5), wherein the control cabinet (1) is respectively connected to the photoelectric sensor (4), the gravity sensor (6) and the high-pressure pump (2) for control.

2. The start-stop system for automatic cleaning of a reduction furnace bell jar according to claim 1, characterized in that: The distance between the photoelectric sensor (4) and the bell jar (3) is 100-1500 mm, the installation height is 800-1000 mm from the reduction furnace base (7), and the light radiation angle of the photoelectric sensor (4) is 20-60°.

3. The start-stop system for automatic cleaning of a reduction furnace bell jar according to claim 1, characterized in that: The gravity sensors (6) include 2 to 5 gravity sensors (6), and all gravity sensors (6) are evenly distributed below the operating platform (5) with the central axis of the bell housing (3) as the center.

4. A start-stop system for automatic cleaning of a reduction furnace bell jar according to claim 3, characterized in that: The measuring range of the gravity sensor (6) is not less than 30t.

5. The start-stop system for automatic cleaning of a reduction furnace bell jar according to claim 1, characterized in that: The control cabinet (1) is a PLC control cabinet.

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