Industrial CT device based on electrical explosion prevention

Abstract

The invention provides an industrial CT device based on electrical explosion prevention. The industrial CT device based on electrical explosion prevention comprises an X-ray machine used for providing X-rays to irradiate a workpiece to be detected; the rotary console is used for adjusting the angle of the to-be-measured workpiece; the detector is used for receiving the X-rays and converting the X-rays into electric signals; the computer system is used for reconstructing an image of the to-be-detected workpiece from the electric signal; wherein an X-ray tube head shell in the X-ray machine is interlocked with the grounding electrical loop. An X-ray tube head shell and a grounding electrical loop are interlocked, a grounding point and a tube head cannot be separated when an X-ray machine works, the tube head is prevented from sparking, and static charges and stray current are introduced into the ground; besides, through reliable grounding and equipotential setting, the potential difference among all parts can be effectively reduced, so that the circuit is more stable, the influence of static electricity and even thunder and lightning is effectively avoided, and the risk of fire disasters or explosions is reduced.

Description

Technical Field

[0001] The invention relates to the field of nondestructive testing, and in particular to an industrial CT device based on electrical explosion protection. Background Art

[0002] In some special industries or departments, especially in chemical industry, steel smelting and special industries, a large amount of flammable gas or flammable liquid vapor is generated in the process of X-ray non-destructive testing technology, forming an explosive gas environment around the industrial CT device. However, with the rapid development of modern large-scale industry and the high degree of automation of the production process, the application of electrical equipment and instrumentation is ubiquitous. However, electrical equipment is the ignition source of flammable gas (vapor). Therefore, the probability of combustion and explosion of flammable gas (vapor) is greatly increased. Based on this, a safe and effective industrial CT device is needed for explosive environments. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an industrial CT device based on electrical explosion protection, which mainly solves the problem in the prior art of lacking a safe and effective industrial CT device for explosive environments.

[0004] The objective of the present invention is achieved through the following solutions:

[0005] According to an embodiment of the present invention, an industrial CT device based on electrical explosion protection includes: an X-ray machine, used to provide X-rays to irradiate a workpiece to be measured; a rotating control console, used to adjust the angle of the workpiece to be measured; a detector, used to receive X-rays and convert them into electrical signals; a computer system, used to reconstruct an image of the workpiece to be measured from the electrical signals; wherein the X-ray tube head housing and the grounding electrical circuit in the X-ray machine are interlocked.

[0006] According to an embodiment of the present invention, each grounding terminal of the industrial CT device can be reliably grounded and connected to the same potential.

[0007] According to an embodiment of the present invention, the grounding terminal includes a circuit grounding terminal, a housing grounding terminal, a mechanical structure fixed part and a moving part of the rotating console, a protective conductor, a metal conduit and a cable metal sheath.

[0008] According to an embodiment of the present invention, each ground terminal of the industrial CT device is connected to a ground bus.

[0009] According to an embodiment of the present invention, the power supply system of the industrial CT device is a TN-S system.

[0010] According to an embodiment of the present invention, each cable connection space in the electrical control cabinet in the power supply system is larger than 80 mm.

[0011] According to an embodiment of the present invention, the minimum cross-sectional area of ​​the conductor connected to the grounding busbar is 4 mm 2 .

[0012] According to an embodiment of the present invention, the plug and the socket in the electrical control cabinet are mechanically interlocked by a connecting rope.

[0013] According to an embodiment of the present invention, the circular hole in the industrial CT device for wiring to pass through is sealed and blocked by explosion-proof mud.

[0014] According to an embodiment of the present invention, the industrial CT device based on electrical explosion protection further includes an explosion-proof fan, which is arranged at the top and bottom away from the rotating control console.

[0015] Compared with the prior art, the present invention has the following beneficial effects: by interlocking the X-ray tube head housing and the grounding electrical circuit, the grounding point and the tube head cannot be separated when the X-ray machine is working, thereby avoiding "sparking" of the tube head and instead introducing static charge and stray current into the ground; in addition, by performing reliable grounding and equipotential setting, the potential difference between the various parts can be effectively reduced, making the circuit more stable, effectively avoiding the influence of static electricity and even lightning, and reducing the risk of fire or explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The embodiments of the present invention are further described below with reference to the accompanying drawings:

[0017] Figure 1 The figure is a schematic diagram of the composition of an industrial CT device based on electrical explosion protection according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] Before proceeding to the following detailed description, it may be advantageous to set forth the definitions of certain words and phrases used throughout this patent document. The terms "coupling", "connection" and their derivatives refer to any direct or indirect communication or connection between two or more elements, regardless of whether those elements are in physical contact with each other. The terms "transmission", "reception" and "communication" and their derivatives cover direct and indirect communication. The terms "include" and "comprising" and their derivatives refer to including but not limited to. The term "or" is inclusive, meaning and / or. The phrase "associated with..." and its derivatives refer to including, including within, interconnecting, containing, contained within, connecting or connecting with, coupling or coupling with, communicating with, cooperating, interweaving, parallel, close to, binding or binding with, having, having attributes, having a relationship or having a relationship with, etc. The term "controller" refers to any device, system or part thereof that controls at least one operation. Such a controller can be implemented with hardware, or a combination of hardware and software and / or firmware. The functions associated with any particular controller can be centralized or distributed, whether local or remote. The phrase "at least one of", when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one of the items in the list may be required. For example, "at least one of A, B, C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, A and B and C.

[0019] Definitions for other specific words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior and future uses of such defined words and phrases.

[0020] In this patent document, the application combination of modules and the division level of sub-modules are only used for illustration, and the application combination of modules and the division level of sub-modules may have different forms without departing from the scope of the present disclosure.

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] As described in the background technology, the prior art lacks a safe and effective industrial CT device for explosive environments. Figure 1As shown, according to an embodiment of the present invention, an industrial CT device 100 based on electrical explosion protection is provided, comprising: an X-ray machine 110, for providing X-rays to irradiate a workpiece to be measured; a rotating control console 120, for adjusting the angle of the workpiece to be measured; a detector 130, for receiving X-rays and converting them into electrical signals; a computer system 140, for reconstructing an image of the workpiece to be measured from the electrical signals; wherein the X-ray tube head housing (not shown) in the X-ray machine 110 is interlocked with a grounding electrical circuit. By interlocking the X-ray tube head housing and the grounding electrical circuit, the grounding point and the tube head cannot be separated when the X-ray machine is working, so as to avoid "sparking" of the tube head, and instead introduce static charge and stray current into the ground.

[0023] In addition, in order to effectively reduce the potential difference between the various parts, make the circuit more stable, effectively avoid the influence of static electricity or even lightning, and reduce the risk of fire or explosion, according to an embodiment of the present invention, each grounding terminal of the industrial CT device is reliably grounded and connected to the same potential.

[0024] According to an embodiment of the present invention, the grounding terminal includes a circuit grounding terminal, a housing grounding terminal, a fixed part and a moving part of the mechanical structure of the rotating console, a protective conductor, a metal conduit and a metal sheath of a cable. In other words, all grounding terminals and metal parts are reliably grounded and at the same potential. To achieve this purpose, according to an embodiment of the present invention, each grounding terminal of the industrial CT device is connected to a grounding bus. The grounding bus (such as a grounding copper bus) provides a grounding conductor to connect various metal parts in the system to establish an equipotential system. The voltage of this equipotential system is almost zero, which can protect the safety of personnel and equipment in the event of overcurrent or fault. Generally, an independent grounding bus is arranged at a height of 500 mm from the ground.

[0025] In addition, in order to ensure safety as much as possible, according to an embodiment of the present invention, the power supply system of the industrial CT device is a TN-S system. In the TN-S (protective connect to neutral-Separe) system, the neutral conductor (N) and the protective conductor (PE) are separately arranged, which is the so-called "three-phase five-wire system". Since the PE line does not pass the load current under normal circumstances, the metal casing of the electrical equipment connected to the PE line is not energized during normal operation, so it is suitable for powering data processing and precision electronic instruments and equipment, and can also be used in explosion-hazardous environments. Therefore, the use of TN-S power supply is both convenient and safe.

[0026] In order to further strengthen the protection of the electrical network, the electrical system mainly has overload, short circuit and ground fault protection for electrical equipment. In addition, the three-phase circuit has a phase failure protection design, the independent line has isolation protection, and the system also has leakage protection.

[0027] In addition, in order to ensure that there is sufficient electrical clearance and creepage distance between the wiring terminals of different potentials after the cables are connected, according to an embodiment of the present invention, the cable connection space in the electrical control cabinet in the power supply system is greater than 80 mm. In addition, for better safety, each electrical equipment housing and cable are designed with protective grounding and working grounding.

[0028] In addition, in order to better protect the equipment, according to an embodiment of the present invention, the minimum cross-sectional area of ​​the conductor connected to the grounding busbar is 4mm 2 The minimum cross-sectional area of ​​the protective conductor is also called the minimum cross-sectional area of ​​the grounding conductor. In the circuit, the protective conductor plays an important role in directing temporary overvoltage to the ground and protecting electrical equipment and people. The larger the protective conductor, the more charge it can bear, and the better the grounding effect. If the cross-sectional area of ​​the protective conductor is not large enough, the grounding effect will be unsatisfactory, and the safety and reliability of the equipment will also be reduced.

[0029] In addition, in order to prevent "sparks" in the electrical control cabinet, according to an embodiment of the present invention, the plug and the socket in the electrical control cabinet are mechanically interlocked by a connecting rope. Through this interlock, the plug and the socket cannot be disconnected when energized.

[0030] In addition, the camera body in the detection room of the industrial CT device is connected to the external cable using a cable compression nut type introduction device.

[0031] In addition, according to an embodiment of the present invention, the circular hole for wiring in the industrial CT device is sealed and blocked by explosion-proof mud. For example, the industrial CT device detects the electrical connection between indoor and outdoor through The power supply lines and communication cables are laid through two circular holes respectively. After the line wiring is completed, they can be sealed with explosion-proof mud.

[0032] In addition, according to an embodiment of the present invention, the industrial CT device based on electrical explosion protection also includes an explosion-proof fan, which is arranged at the top and bottom away from the rotating control console. The main function of the explosion-proof fan is to detect the working ventilation of the equipment and the combustible gas in the room, and to ventilate reliably to reduce the danger level of the explosive place. Moreover, the fan casing adopts an IP20 fan cover to prevent the entry of foreign matter. In addition, the selection of explosion-proof electrical equipment is determined according to the matching of the three conditions of the hazardous area of ​​the explosive gas hazardous place, the explosion-proof type of the electrical equipment and the characteristic parameters of the combustible gas. The reference selection is shown in Table 1.

[0033] Table 1: Electrical equipment options reference table

[0034] type Explosion-proof type Equipment protection level Temperature Group Explosion-proof motor Increased safety "e" Gb T4(300 <t≤450) Explosion-proof robot Positive pressure type "px" Gb T4(300 <t≤450) Lighting Fixtures Flameproof type "d" Gb T4(300 <t≤450) Explosion-proof camera Flameproof type "d" Gb T4(300 <t≤450) Limit switch Flameproof type "d" Gb T4(300 <t≤450) Sensor switch Intrinsically safe type "i" ib T4(300 <t≤450) Explosion-proof fan Flameproof type "d" Gb T4(300 <t≤450)

[0035] In addition, in order to minimize the ignition risk caused by electrical circuits, electrical circuit design is very important. Industrial CT devices are mainly implemented in the following ways:

[0036] 1. The power supply and feedback lines of the mobile motor use special sheathed flame-retardant cables;

[0037] 2. Indoor installation design of industrial CT equipment testing room;

[0038] 3. The electrical circuits should be kept away from the 1mm circumference area of ​​the turntable and laid in places with less explosion risk;

[0039] 4. Collect the wires along the indoor corners and walls in a "horizontal and vertical" manner to the outlet of the testing room;

[0040] 5. Lay the cable through the test room and seal it with explosion-proof mud made of non-volatile materials;

[0041] 6. The rated voltage of the door control motor and lighting line cable shall not be lower than the working voltage. The withstand voltage level of the neutral line shall be consistent with that of the phase line, and the neutral line shall be laid in the same pipeline as the phase line.

[0042] 7. The diameter of the communication line should not be less than 1.5mm 2 , and the wiring is just using cables;

[0043] 8. Cables are not allowed to have "intermediate joints";

[0044] 9. When laying cables through bridges, the bridge interfaces and walls should be reliably sealed;

[0045] 10. Cables passing through the equipment casing should be laid in galvanized steel pipes, and the number of wires should not exceed 40% of the cross-sectional area of ​​the steel pipe.

[0046] In addition, the explosion-proof safety performance of explosive gas environments not only depends on explosion-proof electrical equipment and electrical installation processes with good safety performance, but also requires safe and reliable operation and maintenance to ensure.

[0047] According to the explosion-proof type, check the explosion-proof level of electrical equipment and the explosion-proof performance of electrical equipment.

[0048] According to explosion-proof requirements, electrical equipment should be inspected regularly, including inspections of special types before entering hazardous areas and inspections during operation.

[0049] Safety inspections of electrical equipment include firm and reliable installation of equipment, safety level of cable laying, grounding of electrical equipment, and appearance and performance of equipment.

[0050] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An industrial CT device based on electrical explosion protection, characterized in that: include: X-ray machine, used to provide X-rays to irradiate the workpiece to be tested; Rotating control console, used to adjust the angle of the workpiece to be measured; Detectors, which receive X-rays and convert them into electrical signals; a computer system for reconstructing an image of the workpiece to be measured from the electrical signal; Wherein, the X-ray tube head housing and the grounding electrical circuit in the X-ray machine are interlocked.

2. The electrical explosion-proof industrial CT device according to claim 1, characterized in that: Each grounding terminal of the industrial CT device can be reliably grounded and connected to the same potential.

3. The electrical explosion-proof industrial CT device according to claim 1, characterized in that: The grounding terminal includes a circuit grounding terminal, a shell grounding terminal, a fixed part and a moving part of the mechanical structure of the rotating console, a protective wire, a metal conduit and a cable metal sheath.

4. The electrical explosion-proof industrial CT device according to claim 2, characterized in that: Each ground terminal of the industrial CT device is connected to a ground bus.

5. The electrical explosion-proof industrial CT device according to claim 1, characterized in that: The power supply system of the industrial CT device is a TN-S system.

6. The electrical explosion-proof industrial CT device according to claim 4, characterized in that: The connection space of each cable in the electrical control cabinet of the power supply system is larger than 80 mm.

7. The electrical explosion-proof industrial CT device according to claim 4, characterized in that: The minimum cross-sectional area of ​​each conductor connected to the grounding busbar is 4mm 2 .

8. The electrical explosion-proof industrial CT device according to claim 1, characterized in that: The plug and socket in the electrical control cabinet are mechanically interlocked via a connecting rope.

9. The electrical explosion-proof industrial CT device according to claim 1, characterized in that: The circular hole in the industrial CT device for wiring to pass through is sealed and blocked by explosion-proof mud.

10. The electrical explosion-proof industrial CT device according to claim 1, characterized in that: Also included are explosion-proof fans, which are arranged at the top and the bottom away from the rotating console.

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