Gamma ray driving device with field gamma ray early warning function

Abstract

The utility model provides a gamma ray driving device with a field gamma ray early warning function. The gamma ray driving device comprises a radioactive source driving unit, a detection early warning unit and a cradle for assembling the radioactive source driving unit and the detection early warning unit. Wherein the radioactive source driving unit is a gamma ray flaw detector radioactive source driving device; the detection early warning device comprises a shaft encoder, a counter of the shaft encoder and a wireless transmitter, a transmission shaft of the shaft encoder and the driving wheel are coaxially arranged, a sensing data line of the shaft encoder is electrically connected with the counter, and the counter is connected with a communication line of the wireless transmitter. According to the technical scheme, a radioactive ray radiation degree detection means is avoided to give an alarm, and an early warning execution instruction directly comes from judgment of the working position state of the radioactive source, so that safety early warning can be directly, accurately and reliably implemented.

Description

Technical Field

[0001] This patent application relates to a non-destructive testing device for detecting the quality of welds or components by applying the principle of radiation, and particularly to an alarm device that warns of radiation detection safety in the testing site before and after testing. Background Art

[0002] According to the safety warning clause requirements of the National Occupational Health Standard of the People's Republic of China GBZ117-2022 "Industrial Radiographic Protection Standard" issued by the National Health Commission, "ready" and "irradiation" status indicator lights and sound prompting devices should be set at all boundaries of the control area.

[0003] The current gamma-ray flaw detection site alarm technology mostly uses a ray detection type alarm device, which uses the radiation dose rate as the detection index to determine whether to alarm. Its working process is: starting from the gamma-ray flaw detection, when the detected radiation dose rate is higher than the alarm threshold, an alarm sound is emitted and the status "irradiation" is displayed; when the detected radiation dose rate has not reached the alarm threshold, no alarm is given and the status "ready" is displayed.

[0004] Judging whether the radiation amount in the control area is safe through radiation dose rate detection, this technical means has real technical advantages in terms of judgment basis, but there are also the following key technical deficiencies:

[0005] 1). One of the self-characteristics of the radiation detection element is that when there is no radiation, when the background radiation accumulates to a certain extent, the detection element will have a short-term release current output, causing the alarm instrument to give a short one-time alarm. This situation is highly random, and on-site personnel who are not aware of the situation will mistakenly think that there is radiation exposure and generate fear.

[0006] 2). The working conditions of the flaw detection site are relatively complex, and it is difficult to accurately divide the control area according to the requirement of 15 μSv / h in the regulations. When the ray detection type alarm instrument has to be placed at the boundary of the control area, it may not give a warning response because the detected radiation does not reach the alarm threshold, losing its warning function. Summary of the Invention

[0007] The invention object of this patent application is to solve the technical problems described in the prior art, directly use the working state of the radiation source as the full alarm means, replace the existing radiation dose rate detection method, and provide a gamma-ray driving device with a site gamma-ray early warning function.

[0008] The technical solution of the gamma-ray driving device with a site gamma-ray early warning function disclosed in this patent application, its main technical content is:

[0009] A gamma-ray driving device with a site gamma-ray warning function, which comprises a radiation source driving unit, and further comprises a detection and warning unit and a cradle for assembling the two units;

[0010] The radiation source driving unit is a radiation source driving device for a gamma-ray flaw detector, and its driving wheel housing is fixed on the substrate of the cradle;

[0011] The detection and warning unit includes a shaft encoder, its counter and a wireless transmitter;

[0012] Among them, for the shaft encoder, its transmission shaft is coaxially fixedly assembled on the axis of the driving wheel, and its sensing data line is electrically connected to the counter; the counter is connected to the wireless transmitter by a communication line.

[0013] The technical solution of the gamma-ray driving device with a site gamma-ray warning function disclosed in this patent application no longer adopts the existing technical means of implementing safety alarms by detecting the radiation dose rate in the control area, but takes whether the radiation source is in a safe storage position as the judgment criterion. Its detection means is direct and accurate, and there will be no errors. This technical solution avoids the detection means of the radiation level of the radiation, and the warning execution instruction directly comes from the judgment of the working position state of the radiation source. Therefore, it can directly and accurately implement safety warnings, so that a stable and reliable safety warning response can be obtained within the boundary of the control area. Brief Description of the Drawings

[0014] Figure 1 It is the overall assembly structure diagram of the present utility model.

[0015] Figure 2 It is Figure 1 the top view structure diagram of

[0016] Figure 3 It is the cross-sectional structure diagram of the radiation source driving unit of the present utility model.

[0017] Figure 4 and Figure 5 and Figure 6 are respectively the right view structure diagram, the front view structure and the left view structure diagram of the detection and warning unit.

[0018] Figure 7 and Figure 8 are respectively the front view structure diagram and the left view structure diagram of the site alarm instrument. Detailed Description of the Invention

[0019] Next, the technical content of the gamma-ray driving device with a site gamma-ray warning function of this patent application will be described in detail in combination with the specific implementation structure and its drawings.

[0020] The gamma-ray driving device with the function of site gamma-ray early warning includes a radiation source driving unit, a detection and early warning unit, and a cradle for assembling the two units.

[0021] The described cradle, as Figure 1 shown, is composed of a substrate 27 and a grip ring 28 fixed around the substrate 27. The radiation source driving unit and the detection and early warning unit are fixedly assembled on the substrate 27.

[0022] The radiation source driving unit therein is a radiation source driving device for a gamma-ray flaw detector. The machine shell 1 is fixedly installed on the substrate 27. A driving wheel 13 is rotatably assembled inside the machine shell 1. The crank 3 is located outside the substrate 27, and its inner end is fixedly installed on the axis of the driving wheel 13 for easy rotation operation. A wire channel 14 for the wire part to mesh and wind around is formed between the driving wheel 13 and the machine shell 1. The spiral outer wire of the wire part meshes with the peripheral teeth of the driving wheel 13. A connecting nozzle 2 for detachably installing a cable pipe is provided at the access port of the wire channel 14 of the machine shell 1. As Figure 1 shown, the driving wheel 13 drives the wire part and the radiation source to move out and retract into the gamma-ray flaw detector.

[0023] In this embodiment, in order to avoid accidentally touching the crank and changing the position of the radiation source, which may lead to waste films at least and safety accidents at worst, a lock disk 7 is fixedly installed concentrically with the driving wheel 13 on the side of the machine shell opposite to the crank 3. The lock disk 7 is provided with a number of positioning holes 9 with the same center radius and equal central angles. A lock pin 8 is provided at a position on the crank 3 corresponding to the radius of the positioning hole 9. After the radiation source moves to the filming position or is retracted into the gamma-ray flaw detector body, the lock pin 8 is inserted into the corresponding positioning hole 9 to lock the radiation source, ensuring the technical requirements for radiation safety, and the lock pin 8 is pulled out when needed.

[0024] The described detection and early warning unit includes an axle encoder 6, its counter 15, and a wireless transmitter 16. The counter 15 and the wireless transmitter 16 are fixed on the substrate 27 close to the radiation source driving unit.

[0025] The axle encoder 6 therein has its transmission shaft 11 fixedly assembled on the axis inside the driving wheel 13 through a coupling 12. As Figure 3 shown, the coupling 12 is rotatably supported by bearings on the axle encoder base 5 of the machine shell 1. The transmission data line of the axle encoder 6 is electrically connected to the data interface 17 of the counter 15. The communication interface 20 of the counter 15 is connected to the signal transmission port 19 of the wireless transmitter 16 through a communication line.

[0026] The described counter 15 obtains the transmission information of the shaft encoder 6, converts it into a distance variable, and displays it through the display screen 26. It is compared with the early warning distance value. When the set value is exceeded, an instruction signal is sent to the wireless transmitter 16 via the communication line. The wireless alarm signal is sent out by the transmitting antenna 18 of the wireless transmitter 16. Multiple site alarm devices arranged on the boundary of the control area receive this communication signal, and immediately the display 36 executes the "irradiation" display, the red flashing light 40 flashes, and the alarm voice is played by the speaker 39. The counter 15 itself also gives a warning display through the indicator light 25. When the driving device retracts the radiation source to the safe position of the gamma ray flaw detector, the distance movement value converted by the counter is less than the preset value. At this time, all sites are in a safe state, and the transmitter sends a wireless communication signal to multiple site alarm devices on the boundary of the control area, and the alarm devices execute the "ready" display, the green flashing light 40 flashes, and the corresponding voice playback instruction.

[0027] The described site alarm devices are several in number and are arranged at intervals on the boundary of the control area.

Claims

1. A gamma ray driving device with a field gamma ray early warning function, characterized in that: The device comprises a radiation source driving unit, a detection and early warning unit and a cradle for assembling the two units; The radiation source driving unit is a radiation source driving device for a gamma-ray flaw detector, and its driving wheel housing is fixed on a base plate (27) of a cradle; The detection and early warning unit comprises an axis encoder (6) and a counter (15) thereof and a wireless transmitter (16); The shaft encoder (6) has a transmission shaft (11) coaxially fixedly mounted on the axis of the driving wheel (13), and its sensor data line is electrically connected to the counter (15); the counter (15) is connected to the communication line of the wireless transmitter (16).

2. The gamma ray driving device with field gamma ray early warning function according to claim 1, characterized in that: The cradle is composed of a base plate (27) and a grip ring (28) fixed to the surrounding base plate (27).

3. The gamma ray driving device with field gamma ray early warning function according to claim 1 is characterized in that A lock plate (7) is fixed on one side of the housing where the crank handle (3) is located, concentrically with the driving wheel (13). The lock plate (7) is provided with a plurality of positioning holes (9) with concentric radii and equal central angles. A lock pin (8) is provided on the crank handle (3) at a position corresponding to the radius of the positioning hole (9).

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