Glass furnace liquid level control system

Abstract

The present application provides a glass furnace liquid level control system, which relates to the technical field of automatic control of the liquid level of a glass melting furnace. The system includes a probe, a probe height acquisition unit and a central control unit; the probe and the probe height acquisition unit are both installed on the glass furnace; the probe height acquisition unit is connected to the central control unit by wire and / or wirelessly; the probe is installed on the glass furnace so as to be movable up and down; the probe height acquisition unit is used to monitor the real-time height of the probe, and transmit the real-time height to the central control unit; the central control unit is used to adjust the feed amount and / or overflow amount according to the real-time height. The system reflects the actual changes in the liquid level in the furnace through the lifting height of the probe, and then directly controls the liquid level by adjusting the feed amount and / or overflow amount, without measuring the exact liquid level height, which solves the problem that the existing device needs to detect the exact height of the liquid level in order to achieve liquid level control.

Description

Technical Field

[0001] The invention relates to the technical field of automatic control of liquid level in a glass melting furnace, and in particular to a glass furnace liquid level control system. Background Art

[0002] At present, users have increasingly stringent requirements for glass fiber products. In the production process of glass fiber, whether the components in the glass liquid are stable and uniform is the determining factor affecting the quality of glass fiber products. At the same time, the fluctuation of the glass liquid level will directly affect the control of the production parameters and feed speed of the glass kiln.

[0003] During the melting process of glass liquid, the elements on the surface of the molten glass may volatilize, and the bottom of the glass liquid may not be fully melted. These will lead to different glass components on the surface and bottom of the glass liquid. Therefore, the existing melting furnace is generally equipped with an overflow port after the first zone of the distribution channel to discharge unqualified glass liquid on the surface and bottom. However, when feeding, due to the fluctuation of the glass liquid, when the liquid level is too high and far exceeds the overflow height, the qualified glass liquid in the middle may be discharged together, causing waste. Or when feeding too much, it will cause large fluctuations in the furnace, which will accelerate the erosion of the pool wall, produce stones, and form bubble defects on the one hand; on the other hand, it will affect the stability of the molding operation and affect the quality and output of the product. Therefore, it is very important to monitor the glass liquid level inside the kiln at any time.

[0004] The existing commonly used monitoring device uses a U-shaped hydraulic cylinder for detection, but this device cannot perform real-time monitoring, and uses pressure control detection. In the high-temperature area of ​​the kiln, the pressure detection may be affected by the high temperature, resulting in deviations in the detection results, and it is impossible to truly achieve high-precision detection. Another commonly used detection device is a gas laser glass liquid level control device. Although this device has good control performance and can detect in real time, its structure and working principle are complex, and it needs to detect the actual liquid level height before it can be controlled. At the same time, this device has low reliability and is expensive. Summary of the invention

[0005] A technical problem to be solved by the present invention is that the existing liquid level control device has a complex structure and a complex working principle and needs to detect the actual liquid level height in order to control the liquid level.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a glass furnace liquid level control system, through which the real-time and accurate control of the liquid level in the glass furnace can be achieved. The system includes: a probe, a probe height acquisition unit and a central control unit; the probe height acquisition unit is connected to the central control unit by wire and / or wirelessly;

[0007] The probe is movably installed on the glass furnace up and down; a liquid level baseline mark is provided at a position where the probe is at the same height as the outer surface of the glass furnace, and the liquid level baseline mark indicates the reference height when the lower top of the probe is flush with the overflow port;

[0008] The probe height acquisition unit is installed on the glass furnace to obtain the actual real-time height of the probe above the outer surface of the glass furnace and the reference height of the liquid level baseline mark, and transmit them to the central control unit;

[0009] The central control unit is used to obtain the liquid level difference according to the real-time height and the reference height, and to adjust the feed amount and / or overflow amount according to the liquid level difference.

[0010] In some embodiments, the probe includes: a positioning base and a detection main part; the positioning base is installed on the glass furnace; the detection main part is installed on the positioning base movably up and down and passes through a detection hole opened on the glass furnace.

[0011] In some embodiments, the weight of the detection main component is less than the buoyancy of the glass liquid; and / or a liquid level float is provided on the lower end surface of the detection main component.

[0012] In some embodiments, a lifting height mark is also provided on the upper end of the detection main component to display the real-time height of the probe.

[0013] In some embodiments, the detection main component includes: a lifting controller and a detection rod provided with an air duct;

[0014] The lifting controller is arranged on the detection rod and is used for detecting whether the detection rod is blocked and controlling the lifting of the detection rod according to the detection result.

[0015] In some embodiments, the lifting controller includes: a motor, an air duct and an air pressure monitoring component; the air duct is connected to the air duct of the detection rod, and the air pressure monitoring component, the detection rod and the motor are interconnected in pairs;

[0016] The air duct is used to ventilate the air duct; the air pressure monitoring component is used to monitor the air pressure in the detection rod and transmit the monitored air pressure information to the motor; the motor is used to drive the detection rod to move according to the received air pressure information.

[0017] In some embodiments, the air pressure monitoring assembly includes: a pressurized self-sealing structure composed of a lever assembly, a main valve mechanism, a self-sealing mechanism and a closed air chamber; the air duct, the pressurized self-sealing structure and the detection rod are connected; the pressurized self-sealing structure is used to close the air channel when the detection rod is detected to be blocked.

[0018] In some embodiments, the air pressure monitoring component also includes a pressure detection component installed in the sealed air chamber, which is used to detect the air pressure in the sealed air chamber and transmit the monitored air pressure information to the motor.

[0019] In some embodiments, an air hole is provided on the detection rod for communicating with the pressurized self-sealing structure and the air duct.

[0020] In some embodiments, the probe height acquisition unit includes: a camera device for photographing the real-time lifting and lowering height of the probe.

[0021] The present invention provides a liquid level control system for a glass furnace. The system can monitor the actual changes of the liquid level in the furnace based on the changes in the lifting height of the probe, and can realize real-time monitoring of the liquid level in the furnace. Among them, by adding a liquid level baseline mark on the probe, the position of the liquid level baseline mark is compared with the real-time height position of the probe actually above the outer surface of the glass furnace, so as to directly determine whether the actual liquid level is flush with the overflow port. If the actual height position is higher than the position of the liquid level baseline mark, it means that the glass liquid level exceeds the overflow port at this time, then the glass liquid level is lowered by adjusting the feed amount and / or the overflow amount, and the probe stops regulating when the glass liquid level drops to the position where the actual height is flush with the position of the liquid level baseline mark, and vice versa, thereby realizing real-time control of the liquid level. This regulation process does not require the measurement of the exact height of the liquid level, which solves the problem that the existing device needs to detect the exact height of the liquid level to achieve liquid level regulation.

[0022] Moreover, when adjusting the liquid level, it is only necessary to refer to whether the liquid level baseline mark is flush with the outer surface of the glass furnace, without paying attention to other information, which simplifies the liquid level control principle.

[0023] At the same time, the system provided by the present invention only requires a probe that can move up and down, a probe height acquisition unit and a central control unit to complete liquid level control, and has the advantages of simple structure, economy and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a glass furnace liquid level control system disclosed in an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the installation structure of a glass furnace liquid level control system installed on a glass furnace disclosed in an embodiment of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a lifting controller disclosed in an embodiment of the present invention;

[0028] Figure 4It is a partial structural schematic diagram of the lower end of a detection main component disclosed in an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the local structure of the upper end of a detection main component disclosed in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Probe; 11. Liquid level baseline mark; 12. Liquid level float; 13. Air duct; 14. Air outlet; 2. Probe height acquisition unit; 3. Central control unit; 4. Positioning base frame; 5. Detection rod; 6. Motor; 7. Air duct; 8. Lever assembly; 81. Filter; 9. Main valve mechanism; 10. Self-sealing mechanism; 15. Internal channel; 16. Ventilation duct. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0033] The present invention provides these embodiments to make the present invention thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limiting.

[0034] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0035] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly perpendicular, but is within the tolerance range. "Parallel" is not strictly parallel, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0036] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0037] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0038] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0039] Figure 1 It is a structural schematic diagram of a glass furnace liquid level control system disclosed in an embodiment of the present invention; Figure 2 It is a schematic diagram of the installation structure of a glass furnace liquid level control system installed on a glass furnace disclosed in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a lifting controller disclosed in an embodiment of the present invention; Figure 4 It is a partial structural schematic diagram of the lower end of a detection main component disclosed in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the partial structure of the upper end of a detection main component disclosed in an embodiment of the present invention. Figure 1-5 The system provided by the present invention is described in detail.

[0041] The embodiment of the present invention provides a glass furnace liquid level control system. Figure 1 and Figure 2 As shown, the system includes: a probe 1, a probe height acquisition unit 2 and a central control unit 3; the probe height acquisition unit 2 is connected to the central control unit 3 by wire and / or wirelessly;

[0042] The probe 1 is movably mounted on the glass furnace. A liquid level baseline mark 11 is provided at a position where the probe 1 is at the same height as the outer surface of the glass furnace. The liquid level baseline mark 11 indicates a reference height when the lower top of the probe is flush with the overflow port.

[0043] The probe height acquisition unit 2 is installed on the glass furnace, and is used to obtain the real-time height of the probe 1 above the outer surface of the glass furnace and the reference height of the liquid level baseline mark 11, and transmit them to the central control unit 3;

[0044] The central control unit 3 is used to obtain the liquid level difference according to the real-time height and the reference height, and to adjust the feed amount and / or overflow amount according to the liquid level difference.

[0045] The system provided by the present invention can realize real-time monitoring of the liquid level in the furnace based on the changes in the lifting height of the probe and the actual changes in the liquid level in the reaction furnace. Among them, by adding a liquid level baseline mark on the probe and comparing the position of the liquid level baseline mark with the real-time height position of the probe actually above the outer surface of the glass furnace, it is possible to directly determine whether the actual liquid level is flush with the overflow port. If the actual height position is higher than the position of the liquid level baseline mark, it means that the glass level exceeds the overflow port at this time, then the glass level is lowered by adjusting the feed amount and / or the overflow amount, and the probe stops regulating when the glass level drops to the position where the actual height is flush with the position of the liquid level baseline mark, and vice versa, thereby realizing real-time control of the liquid level. This regulation process does not require measuring the exact height of the liquid level, which solves the problem that the existing device needs to detect the exact height of the liquid level in order to achieve liquid level regulation.

[0046] Moreover, the system provided by the present invention only needs to refer to whether the liquid level baseline mark is flush with the outer surface of the glass furnace when adjusting the liquid level, without paying attention to other information, thus simplifying the liquid level control principle. At the same time, the system provided by the present invention only needs a probe that can move up and down, a probe height acquisition unit and a central control unit to complete the liquid level control, which has the advantages of simple structure, economy and practicality.

[0047] In some embodiments, Figure 1 and 2 As shown, the probe 1 includes: a positioning base frame 4 and a detection main part; the positioning base frame 4 is installed on the glass furnace; the detection main part is installed on the positioning base frame movably up and down and passes through the detection hole opened on the glass furnace.

[0048] In specific implementation, the probe 1 is fixed on the glass furnace through the positioning base 4, and the other end of the positioning base 4 is connected to the detection main part, and the detection main part is installed on the positioning base movably up and down and extends into the glass furnace through the detection hole opened on the glass furnace.

[0049] In some embodiments, the weight of the detection main component is less than the buoyancy of the glass liquid; and / or a liquid level float 12 is provided on the lower end surface of the detection main component.

[0050] In specific implementation, the main detection component can be lifted up by relying on the buoyancy of the glass liquid surface, so that the main detection component can be raised and lowered accordingly with the height change of the glass liquid surface, thereby realizing the conversion of the height change of the glass liquid level into the lifting height of the main detection component.

[0051] like Figure 4 As shown, in order to achieve better conversion and prevent the detection main part from being inserted into the glass liquid, thereby causing an error in the lifting height, a liquid level float 12 is provided at the lower end of the detection main part (i.e., the end in contact with the liquid surface) in this embodiment. The liquid level float increases the contact surface between the detection main part and the liquid surface, thereby increasing the support force of the glass liquid on the detection main part.

[0052] In addition, in this embodiment, the probe can also be provided with a positioning device. The positioning device is installed at the detection hole opened on the glass furnace, and is used to fix the movement trajectory of the detection main part when it is lifting and lowering, so that the detection main part can be lifted and lowered according to the preset trajectory, and prevent the detection main part from deviating from the preset track, resulting in errors in the judgment result of the lifting height, thereby ensuring the accuracy of liquid level control.

[0053] In some embodiments, Figure 5 As shown, a lifting height mark is also provided on the upper end of the detection main part to display the real-time height of the probe.

[0054] In specific implementation, the lifting height mark can be a numerical value representing each liquid level difference. For example, if the numerical value of the liquid level baseline mark 11 is set to "0", the lifting height mark can be a positive or negative value distributed above and below "0" as the median, such as -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, etc. The lifting height mark located at the upper end of the liquid level baseline mark 11 indicates that the detection main part has dropped more, and the lower end of the detection main part is lower than the height of the overflow port; the lifting height mark located at the lower end of the liquid level baseline mark 11 indicates that the detection main part has dropped less, and the lower end of the detection main part is still higher than the height of the overflow port. When the lifting height mark is represented by a specific numerical value representing the distance difference, the specific liquid level difference can be judged more intuitively based on these lifting height marks.

[0055] In some embodiments, the detection main part includes: a lifting controller and a detection rod 5 provided with an air duct 13;

[0056] The lifting controller is arranged on the detection rod 5, and is used for detecting whether the detection rod 5 is blocked and controlling the lifting of the detection rod 5 according to the detection result.

[0057] In specific implementation, air is ventilated into the detection rod 5 through the additional air duct 13, and when the detection rod 5 contacts the liquid surface, the air port 14 is blocked, and the air pressure in the air duct 13 increases. Then, when the lifting controller detects the increase in air pressure in the air duct 13, it determines that the detection rod 5 is blocked, and lifts the detection rod to make it leave the liquid surface. At this time, since the probe height acquisition unit acquires the height of the detection rod 5 in real time, when the height increase of the detection rod 5 is received, the acquired lowest height can be directly used as the real-time height of the liquid surface, and then the subsequent control operation is performed.

[0058] In some embodiments, Figure 3 As shown, the lifting controller includes: a motor 6, an air duct 7 and an air pressure monitoring component; the air duct 7 is connected to the air duct 13 of the detection rod 5 through the ventilation duct 16, and the air pressure monitoring component, the detection rod 5 and the motor 6 are interconnected in pairs;

[0059] The air duct 7 is used to ventilate the air duct 13; the air pressure monitoring component is used to monitor the air pressure in the detection rod 5 and transmit the monitored air pressure information to the motor 6; the motor 6 is used to drive the detection rod 5 to move according to the received air pressure information.

[0060] During specific implementation, the air duct 7 is connected to the air duct 13 of the detection rod 5 through the ventilation duct 16, and the air duct 7 is used to ventilate the air duct 13. The air pressure monitoring component, the detection rod 5 and the motor 6 are interconnected in pairs. The air pressure monitoring component is used to monitor the air pressure in the detection rod 5, and transmit the monitored air pressure information to the motor 6. The motor 6 is used to drive the detection rod 5 to move according to the received air pressure information. The working principle is: when it is detected that the air pressure in the air duct 13 of the detection rod 5 remains unchanged and maintains a constant value, it indicates that the detection rod 5 has not yet contacted the liquid surface, and the motor 6 continues to drive the detection rod 5 to move downward; when it is detected that the air pressure in the air duct 13 of the detection rod 5 begins to rise, it indicates that the detection rod 5 contacts the liquid surface, and the motor 6 drives the detection rod 5 to rise.

[0061] In this embodiment, the sensitivity of liquid level detection can be improved according to the lifting controller.

[0062] In some embodiments, Figure 3 As shown, the air pressure monitoring component includes: a pressurized self-sealing structure composed of a lever assembly 8, a main valve mechanism 9, a self-sealing mechanism 10 and a closed air chamber; the air duct 7, the pressurized self-sealing structure and the detection rod 5 are connected; the pressurized self-sealing structure is used to close the air channel when the detection rod 5 is detected to be blocked.

[0063] In specific implementation, air is ventilated into the air pressure monitoring assembly through the air duct 7, and the airflow passes through the lever assembly 8, the main valve mechanism 9, the closed air chamber and the self-sealing mechanism 10 in sequence, and finally flows into the air duct 13. The working principle mainly utilizes the Venturi effect, wherein the air duct 13 is required for air pressure monitoring and equipment cooling, and sealing pads are set at all links to ensure air tightness in the space.

[0064] When starting to work, the lever assembly 8 starts to work, opens the main valve mechanism 9, and the air passes through the filter 81 to reach the internal closed air chamber, and then enters the air duct 13 in the detection rod 5 through the internal passage 15 of the rod, and is discharged from the air port 14 at the bottom of the air duct 13. When the air port 14 at the bottom of the detection rod 5 is blocked by the glass liquid, the closed air chamber generates negative pressure, so that the self-sealing mechanism 10 returns to the initial state, and the lever assembly 8 closes the main valve mechanism 9 at the same time. At this time, the pressure in the closed air chamber and the air pressure in the air duct 13 of the detection rod 5 begin to increase, and the motor 6 receives the air pressure information of the increased air pressure, which drives the detection rod 5 to rise.

[0065] In some embodiments, the air pressure monitoring component also includes a pressure detection component installed in the sealed air chamber, which is used to detect the air pressure in the sealed air chamber and transmit the monitored air pressure information to the motor 6.

[0066] In some embodiments, the detection rod 5 is provided with an air hole for communicating with the pressurized self-sealing structure and the air duct 7 .

[0067] In some embodiments, the probe height acquisition unit 2 includes: a camera device for photographing the real-time lifting height of the probe 1 .

[0068] The system provided in this embodiment has a simple structure, is economical and practical, and has universal applicability.

[0069] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0070] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A glass furnace liquid level control system, characterized in that: The system comprises: a probe (1), a probe height acquisition unit (2) and a central control unit (3); the probe height acquisition unit (2) is connected to the central control unit (3) by wire and / or wirelessly; The probe (1) is movably mounted on the glass furnace in an upward and downward manner; a liquid level baseline mark (11) is provided at a position where the probe (1) is at the same height as the outer surface of the glass furnace, and the liquid level baseline mark (11) indicates a reference height when the lower top of the probe (1) is flush with the overflow port; the probe (1) comprises a detection main part, and the detection main part comprises: a lifting controller and a detection rod (5) provided with an air duct (13); the lifting controller is arranged on the detection rod (5) and is used to detect whether the detection rod (5) is blocked and control the lifting of the detection rod (5) according to the detection result; the lifting controller comprises an air duct (7) and an air pressure monitoring component; the air duct (7) is connected to the air duct (13) of the detection rod (5); the lifting controller The air pressure monitoring assembly also includes: a motor (6); the air pressure monitoring assembly, the detection rod (5) and the motor (6) are interconnected in pairs; the air pressure monitoring assembly includes: a pressure-bearing self-sealing structure composed of a lever assembly (8), a main valve mechanism (9), a self-sealing mechanism (10) and a closed air chamber; the air duct (7), the pressure-bearing self-sealing structure and the detection rod (5) are connected; the pressure-bearing self-sealing structure is used to close the air passage when the detection rod (5) is detected to be blocked; the air pressure monitoring assembly also includes a pressure detection element installed in the closed air chamber, which is used to detect the air pressure in the closed air chamber and transmit the monitored air pressure information to the motor (6); the detection rod (5) is provided with an air hole, which is used to communicate with the pressure-bearing self-sealing structure and the air duct (7); The probe height acquisition unit (2) is installed on the glass furnace, and is used to acquire the actual real-time height of the probe (1) above the outer surface of the glass furnace and the reference height of the liquid level baseline mark (11), and transmit them to the central control unit (3); The central control unit (3) is used to obtain the liquid level difference according to the real-time height and the reference height, and to regulate the feed amount and / or overflow amount according to the liquid level difference.

2. The system according to claim 1, characterized in that The probe (1) further comprises: a positioning base frame (4); the positioning base frame (4) is installed on a glass furnace; the detection main part is installed on the positioning base frame (4) movably up and down and passes through a detection hole opened on the glass furnace.

3. The system according to claim 2, characterized in that The weight of the detection main component is less than the buoyancy of the glass liquid; and / or a liquid surface floating plate (12) is provided on the lower end surface of the detection main component.

4. The system according to claim 2 or 3, characterized in that: The upper end of the detection main part is also provided with a lifting height mark for displaying the real-time height of the probe (1).

5. The system according to claim 1, characterized in that The air duct (7) is used to ventilate the air duct (13); the air pressure monitoring component is used to monitor the air pressure in the detection rod (5) and transmit the monitored air pressure information to the motor (6); the motor (6) is used to drive the detection rod (5) to move according to the received air pressure information.

6. The system according to claim 1, characterized in that The probe height acquisition unit (2) comprises: a camera device for photographing the real-time lifting height of the probe (1).

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