A device and method for assisting in replacing a radiation source shell

Abstract

The present invention discloses a device and method for assisting in replacing a radiation source shell, the device comprising: a shielding body having a housing cavity matched with the radiation source shell, the housing cavity having a cavity entrance and a cavity operation port; a cylinder body sleeved on the outside of the shielding body, the cylinder body having a cylinder entrance capable of exposing the cavity entrance and a cylinder operation port capable of exposing the cavity operation port; after the radiation source shell enters the housing cavity through the cylinder entrance and the cavity entrance, the cover of the radiation source shell corresponds to the cavity operation port and the cylinder operation port; a locking mechanism is arranged at the cylinder entrance; the cylinder body is pivotally arranged on a supporting structure and has a first rotation fixed position and a second rotation fixed position. The device and method of the present invention can reduce the weight of the tool and improve the convenience of operation.

Description

Technical Field

[0001] The invention relates to a radioactive source in well logging technology, and in particular to a device and method for assisting in replacing a source shell of a radioactive source. Background Art

[0002] In oilfield logging, radioactive sources are needed to detect the downhole environment. In the oilfield logging application of radioactive sources, the downhole environment is complex. In addition to the high-frequency vibration of the logging instrument itself, there are also factors such as the corrosiveness of downhole mud and other substances and the downhole high temperature. Due to vibration, friction, corrosion and other reasons, the shell of the radioactive source will be worn and scratched. If used for a long time, the performance of the shell of the radioactive source will be reduced. In order to extend the use time of the radioactive source, it is recommended to replace the shell with a new one when the shell is found to be damaged to ensure the safety of the use of the radioactive source.

[0003] Figure 1 is a schematic diagram of the radiation source shell, such as Figure 1 As shown, the source housing has an irregularly shaped top 11, a cylindrical housing body 12, and a cover 13 located at the bottom of the housing body. The radiation source is inside the housing body 12.

[0004] The cover 13 has a "I"-shaped notch 131. A tool can be inserted into the notch 131 to unscrew the cover 13. To replace the source shell, the cover 13 needs to be unscrewed, the radioactive source is taken out, and then placed in a new radioactive source shell.

[0005] Figure 2 A schematic diagram of a tool for replacing a radioactive source housing in the prior art, such as Figure 2 As shown, the tool for replacing the radiation source shell currently consists of a vise 21 and a lead rod 22 with a round hole. The vise 21 is used to fix the radiation source shell, so that the cover 13 can be unscrewed by the tool. The lead rod 22 is used to temporarily accommodate the radiation source. This device is not a standardized special tool. After the source shell is fixed by the vise 21 and the cover 13 is unscrewed, the vise 21 needs to be loosened to pour out the radiation source. The operation is inconvenient and the operation time is long. If multiple radiation sources are operated, the radiation dose received by the staff increases, posing a threat to the health of the staff, and the construction period is long. It is easy to leak radiation and the shielding effect is poor. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a device and method for assisting in replacing a radiation source shell, which can reduce the weight of the tool and improve the convenience of operation.

[0007] In order to achieve the above object, the present invention provides a device for assisting in replacing a radiation source shell, comprising:

[0008] The shielding body has a receiving cavity matched with the radiation source shell, and the receiving cavity has a cavity entrance and a cavity operation port;

[0009] A cylinder body is sleeved on the outside of the shielding body, and the cylinder body has a cylinder body inlet capable of exposing the cavity inlet and a cylinder body operation port capable of exposing the cavity operation port;

[0010] After the radiation source shell enters the accommodating cavity through the barrel inlet and the cavity inlet, the cover of the radiation source shell corresponds to the cavity operation port and the barrel operation port;

[0011] A locking mechanism, arranged at the entrance of the cylinder;

[0012] The cylinder is pivotally arranged on the supporting structure and has a first rotational fixed position and a second rotational fixed position.

[0013] In the above device, in the first rotational fixed position, the cylinder inlet faces upward;

[0014] In the second rotational fixed position, the cylinder inlet faces downward.

[0015] In the above device, the support structure includes: a bottom plate; a left bracket and a right bracket, which are arranged on the bottom plate;

[0016] The cylinder is welded with a left pivot shaft and a right pivot shaft, the left pivot shaft is sleeved on the left bracket, and the right pivot shaft is sleeved on the right bracket.

[0017] In the above device, the right pivot shaft includes the following cross-sectional areas from large to small:

[0018] a first isolation step having a diameter larger than the pivot hole of the right bracket;

[0019] a second pivoting step, disposed in the pivoting hole of the right bracket;

[0020] A third mounting step is provided with a rotating handle;

[0021] The fourth thread step has an external thread and is fixed to the anti-slip nut.

[0022] In the above device, the right bracket has a threaded hole; the threaded hole is installed with a ball screw;

[0023] The cylinder body is provided with a first circular pit and a second circular pit;

[0024] In the first rotational fixed position, the ball-shaped top screw abuts against the first round pit;

[0025] In the second rotational fixed position, the ball-shaped top screw abuts against the second round pit.

[0026] In the above device, the shielding body is a tungsten steel shell with a cylindrical outer circumference, and the cylinder body is a carbon steel shell with a cylindrical outer circumference. The tungsten steel shell and the carbon steel shell are fixed by fixing pins.

[0027] In the above device, the upper part of the accommodating cavity is a square groove matching the top of the radiation source shell, the lower part of the accommodating cavity is a cylindrical groove matching the shell body of the radiation source shell, and the cover of the radiation source shell can be taken out through the cavity operating port.

[0028] In the above device, the locking mechanism comprises:

[0029] A fixed block, fixed to the upper end surface of the cylinder;

[0030] A locking tongue, sleeved in the sliding hole in the fixing block;

[0031] A spring, arranged between the locking tongue and the fixing block;

[0032] The locking tongue has an arc-shaped surface that allows the radiation source shell to enter the cylinder entrance.

[0033] The present invention also provides a method for replacing a radiation source shell by using the above device, comprising:

[0034] Step 1, placing the cylinder in the first rotational fixed position, placing the radiation source shell into the accommodating cavity through the cylinder entrance, and locking the cylinder entrance with the locking mechanism;

[0035] Step 2: placing the cylinder in the second rotational fixed position, and unscrewing the cover of the radiation source shell through the cavity operation port;

[0036] Step three: placing the barrel in the first rotational fixed position so that the radiation source falls into the container outside the barrel through the cavity operation port.

[0037] The above method further includes:

[0038] Step 4, opening the locking mechanism, taking out the radiation source shell, and placing a second radiation source shell into the accommodating cavity through the cylinder entrance, and locking the cylinder entrance with the locking mechanism;

[0039] Step 5, placing the cylinder in the second rotational fixed position, unscrewing the second cover of the second radiation source shell through the cavity operation port, inserting the radiation source, and then screwing on the second cover;

[0040] Step six: place the cylinder in the first rotational fixed position, open the locking mechanism, and take out the second radiation source shell.

[0041] By adopting the present invention, the operating posture of the radiation source shell can be conveniently adjusted, the convenience of replacing the radiation source shell is improved, the weight of the tool is effectively reduced, and the shielding effect is increased.

[0042] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of the radiation source shell;

[0044] Figure 2 Schematic diagram of a tool for replacing a radioactive source housing for the prior art;

[0045] Figure 3 is a structural diagram of a device for assisting in replacing a radiation source shell in an embodiment of the present invention;

[0046] Figure 4 It is a partial assembly schematic diagram of the device in the embodiment of the present invention;

[0047] Figure 5 is a schematic diagram of a device in an embodiment of the present invention being located in a first rotationally fixed position;

[0048] Figure 6 is a schematic diagram of the device in an embodiment of the present invention being located in a second rotationally fixed position;

[0049] Figure 7 1 is a flowchart of the steps of the method in an embodiment of the present invention.

[0050] Wherein, the description of the accompanying drawings is as follows, in the prior art:

[0051] Top 11;

[0052] Shell 12;

[0053] Cover 13;

[0054] slot 131;

[0055] Bench vise 21;

[0056] Lead rod 22;

[0057] In the present invention:

[0058] Shield 31

[0059] Cylinder 32

[0060] Cylinder inlet 321

[0061] Cylinder operation port 322

[0062] First isolation step 3231

[0063] Second pivoting step 3232

[0064] The third installation step 3233

[0065] Fourth thread step 3234

[0066] First round pit 324

[0067] Second round pit 325

[0068] Bottom plate 33

[0069] Left bracket 34

[0070] Right bracket 35

[0071] Pivot hole 351

[0072] Threaded hole 352

[0073] Turn the handle 40

[0074] Anti-shedding mother 41

[0075] Ball thread 42

[0076] Fixing pin 43

[0077] Fixed block 51

[0078] Lock tongue 52

[0079] Spring 53 DETAILED DESCRIPTION

[0080] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the claims attached to the present invention.

[0081] Figure 3 is a structural diagram of a device for assisting in replacing a radiation source shell in an embodiment of the present invention, Figure 5 is a schematic diagram of the device in an embodiment of the present invention being located in a first rotationally fixed position, Figure 6 Schematic diagram of the device in the embodiment of the present invention being located in the second rotational fixed position; Figure 3 , Figure 5 and Figure 6 As shown, an embodiment of the present invention provides a device for assisting in replacing a radiation source shell, comprising:

[0082] The shielding body 31 has a receiving cavity matched with the radiation source shell, and the receiving cavity has a cavity entrance and a cavity operation port;

[0083] The cylinder 32 is sleeved on the outside of the shielding body 31, and the cylinder 32 has a cylinder inlet 321 capable of exposing the cavity inlet and a cylinder operation port 322 capable of exposing the cavity operation port;

[0084] After the radiation source shell enters the accommodating cavity through the barrel inlet 321 and the cavity inlet, the cover 13 of the radiation source shell corresponds to the cavity operation port and the barrel operation port 322;

[0085] A locking mechanism, arranged at the cylinder inlet 321;

[0086] The cylinder 32 is pivotally mounted on the support structure and has a first rotationally fixed position and a second rotationally fixed position.

[0087] It can be seen that in the embodiment of the present invention, the radiation source shell is shielded by the internal shielding body 31, and the rotation positioning operation is performed by the external cylinder 32, so that the operating posture of the radiation source shell can be conveniently adjusted, and the cover 13 can be conveniently removed through the cylinder operating port to replace the radiation source, thereby improving the convenience of replacing the radiation source shell.

[0088] refer to Figure 5 As shown, in another embodiment of the present invention, in the first rotational fixed position, the cylinder inlet 321 faces upward; Figure 6 As shown, in the second rotational fixed position, the cylinder inlet 321 faces downward, and the cylinder operating port 322 faces upward.

[0089] refer to Figure 3 As shown, in another embodiment of the present invention, the support structure includes: a bottom plate 33; a left bracket 34 and a right bracket 35, which are arranged on the bottom plate 33;

[0090] The cylinder 32 is welded with a left pivot shaft and a right pivot shaft. The left pivot shaft is sleeved on the left bracket 34 , and the right pivot shaft is sleeved on the right bracket 35 .

[0091] Figure 4 is a partial assembly diagram of the device in the embodiment of the present invention, refer to Figure 4 As shown, in another embodiment of the present invention, the right pivot shaft includes the following cross-sectional areas from large to small:

[0092] The first isolation step 3231 has a diameter larger than the pivot hole 351 of the right bracket 35;

[0093] A second pivoting step 3232 is provided in the pivoting hole 351 of the right bracket 35;

[0094] The third installation step 3233 is provided with a rotating handle 40;

[0095] The fourth thread step 3234 has an external thread and is fixed to the anti-slip nut 41 .

[0096] refer to Figure 4 As shown, in another embodiment of the present invention, the right bracket 35 has a threaded hole 352; the threaded hole is installed with a ball screw 43;

[0097] The cylinder has a first round hole 324 and a second round hole 325;

[0098] In the first rotational fixed position, the ball screw 43 abuts against the first round pit 324;

[0099] In the second rotational fixed position, the ball screw 43 abuts against the second round pit 325 .

[0100] refer to Figure 3 and Figure 6 As shown, in one embodiment of the present invention, the shielding body 31 is a tungsten steel shell with a cylindrical outer circumference, and the cylinder body 32 is a carbon steel shell with a cylindrical outer circumference. The tungsten steel shell and the carbon steel shell are fixed by a fixing pin 43.

[0101] In this way, the tungsten steel shielding body 31 has a better radiation shielding effect, and the carbon steel cylinder 32 has better welding characteristics. The cylinder 32 can be directly welded to the left pivot shaft and the right pivot shaft, is not easy to crack, and can be better installed and operated.

[0102] refer to Figure 3 , Figure 5 and Figure 6 In one embodiment of the present invention, the upper portion of the accommodating cavity is a square groove matching the top 11 of the radiation source shell, the lower portion of the accommodating cavity is a cylindrical groove matching the shell body 12 of the radiation source shell, and the cover 13 of the radiation source shell can be taken out through the cavity operation port.

[0103] refer to Figure 3 As shown, in one embodiment of the present invention, the locking mechanism includes:

[0104] A fixing block 51, fixed on the upper end surface of the cylinder 32;

[0105] The locking tongue 52 is sleeved in the sliding hole in the fixing block 51;

[0106] A spring 53, disposed between the locking tongue 52 and the fixing block 51;

[0107] The locking tongue 52 has an arc-shaped surface that allows the radiation source housing to enter the cylinder entrance.

[0108] like Figure 5 As shown, when the radiation source shell is inserted downward, the radiation source shell will come into contact with the arc surface, and the arc surface can convert part of the downward force into a horizontal force, pushing the lock tongue 52 to squeeze the spring 53, so that the lock tongue 52 moves backward. When the radiation source shell is inserted to the bottom, the contact between the radiation source shell and the arc surface disappears, and the spring 53 returns to its initial state, so that the lock tongue 52 returns to its original position. After the lock tongue 52 returns to its original position, it can prevent the radiation source shell from moving up and down.

[0109] Figure 7 is a flowchart of the steps of the method in an embodiment of the present invention, such as Figure 7 As shown, an embodiment of the present invention also provides a method for using the device to assist in replacing a radiation source shell, comprising:

[0110] Step 601, placing the cylinder in the first rotational fixed position, placing the radiation source shell into the accommodating cavity through the cylinder entrance, and locking the cylinder entrance with the locking mechanism;

[0111] Step 602, placing the cylinder in the second rotational fixed position, and unscrewing the cover of the radiation source shell through the cavity operation port;

[0112] Step 603: place the barrel in the first rotational fixed position so that the radiation source falls into the container outside the barrel through the cavity operation port.

[0113] It can be seen that the method embodiment of the present invention uses an auxiliary device to change the operating position and shield the radiation source during the source shell replacement process, and can conveniently open the cover of the radiation source shell to take out the radiation source.

[0114] refer to Figure 7 As shown, in another embodiment of the present invention, the method further includes:

[0115] Step 604, open the locking mechanism, take out the radiation source shell, and place the second radiation source shell into the accommodating cavity through the cylinder entrance, and lock the cylinder entrance with the locking mechanism;

[0116] Step 605, placing the cylinder in the second rotational fixed position, unscrewing the second cover of the second radiation source shell through the cavity operation port, inserting the radiation source, and then screwing on the second cover;

[0117] Step 606: place the cylinder in the first rotational fixed position, open the locking mechanism, and take out the second radiation source shell.

[0118] It can be seen that the method embodiment of the present invention uses an auxiliary device to perform operating position change and radiation source shielding during source shell replacement, and can conveniently place the radiation source into a new radiation source shell.

[0119] In the embodiment of the present invention, the cylinder and the shaft are made of ordinary carbon steel. The purpose of using ordinary carbon steel is to make the welding performance of the shaft and the cylinder better. Tungsten steel is different from carbon steel. If the cylinder is eliminated and the shaft and the shield are directly welded, silver welding or copper welding is usually used. Compared with ordinary welding strength, these two welding methods are expensive and have low strength. Therefore, the cylinder is added to ensure strength and reduce manufacturing costs. The function of the fixing pin is to fix the cylinder and the shield to prevent the shield and the cylinder from relative rotation.

[0120] In another method embodiment of the present invention, the operation process can be divided into the following steps according to the operation purpose:

[0121] Step a: Insert the source housing

[0122] Operation: As Figure 3 As shown in the figure, there is an arc surface at the top of the lock tongue. When the radiation source shell is inserted downward, the upper part of the radiation source shell will come into contact with the arc surface. The arc surface can convert part of the downward force into horizontal force, squeezing the lock tongue spring and moving the lock tongue backward. When the radiation source shell is inserted to the bottom, the contact between the radiation source shell and the arc surface disappears, and the spring returns to its initial state, causing the lock tongue to return to its original position. Figure 5 As shown in the figure, after the lock tongue returns to its original position, it can prevent the radiation source housing from moving up and down. Figure 3 The shape of the groove Figure 1 The upper part of the radiation source shell has the same shape, and after the radiation source shell is inserted into the shielding body, the radiation source shell can be prevented from rotating.

[0123] Step b: Remove the radiation source

[0124] Operation: Rotate the handle 180° so that the bottom faces upward. Figure 6 As shown, the ball of the ball screw bounces into the second round hole, and the cylinder is fixed. Use a flat-blade screwdriver to loosen and remove the upper cover of the radioactive source shell. Rotate the handle 180° again, and the radioactive source will fall due to gravity (a circle of lead or tungsten steel can be placed at the bottom to reduce the radiation of the radioactive source to the surrounding personnel after the radioactive source falls).

[0125] Step c: Remove the old radiation source shell and replace it with a new one

[0126] Operation: Move the lock back by hand and remove the old radioactive source shell. Take a new radioactive source shell and repeat steps a and b, then put the radioactive source in, and then tighten the cover of the radioactive source shell to complete the replacement.

[0127] Therefore, the present invention also has the following advantages:

[0128] 1) The embodiment of the present invention can conveniently adjust the operating posture of the radiation source shell, and can conveniently remove the cover through the cylinder operating port to replace the radiation source, thereby improving the convenience of replacing the radiation source shell.

[0129] 2) Compared with the existing caliper tools, the embodiments of the present invention can effectively reduce the weight of the tool.

[0130] 3) The shielding body of the embodiment of the present invention is made of tungsten steel, which can enhance the shielding effect.

[0131] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A device for assisting in replacing a radiation source shell, characterized in that: include: The shielding body has a receiving cavity matched with the radiation source shell, and the receiving cavity has a cavity entrance and a cavity operation port; A cylinder body is sleeved on the outside of the shielding body, and the cylinder body has a cylinder body inlet capable of exposing the cavity inlet and a cylinder body operation port capable of exposing the cavity operation port; After the radiation source shell enters the accommodating cavity through the barrel inlet and the cavity inlet, the cover of the radiation source shell corresponds to the cavity operation port and the barrel operation port; A locking mechanism, arranged at the entrance of the cylinder; The cylinder is pivotally arranged on the supporting structure and has a first rotational fixed position and a second rotational fixed position; In the first rotational fixed position, the cylinder inlet faces upward; In the second rotational fixed position, the cylinder inlet faces downward.

2. The device according to claim 1, characterized in that The support structure comprises: a bottom plate; a left bracket and a right bracket, which are arranged on the bottom plate; The cylinder is welded with a left pivot shaft and a right pivot shaft, the left pivot shaft is sleeved on the left bracket, and the right pivot shaft is sleeved on the right bracket.

3. The device according to claim 2, characterized in that The right pivot axis includes the following sections from large to small cross-sectional areas: a first isolation step having a diameter larger than the pivot hole of the right bracket; a second pivoting step, disposed in the pivoting hole of the right bracket; A third mounting step is provided with a rotating handle; The fourth thread step has an external thread and is fixed to the anti-slip nut.

4. The device according to claim 3, characterized in that The right bracket has a threaded hole; the threaded hole is installed with a ball screw; The cylinder body is provided with a first circular pit and a second circular pit; In the first rotational fixed position, the ball-shaped top screw abuts against the first round pit; In the second rotational fixed position, the ball-shaped top screw abuts against the second round pit.

5. The device according to claim 1, characterized in that The shielding body is a tungsten steel shell with a cylindrical outer circumference, and the cylinder body is a carbon steel shell with a cylindrical outer circumference. The tungsten steel shell and the carbon steel shell are fixed by fixing pins.

6. The device according to claim 1, characterized in that The upper part of the accommodating cavity is a square groove matching the top of the radiation source shell, and the lower part of the accommodating cavity is a cylindrical groove matching the shell body of the radiation source shell. The cover of the radiation source shell can be taken out through the cavity operation port.

7. The device according to claim 1, characterized in that The locking mechanism comprises: A fixed block, fixed to the upper end surface of the cylinder; A locking tongue, sleeved in the sliding hole in the fixing block; A spring, arranged between the locking tongue and the fixing block; The locking tongue has an arc-shaped surface that allows the radiation source shell to enter the cylinder entrance.

8. A method for replacing a radiation source shell by using the device according to any one of claims 1 to 7, characterized in that: include: Step 1, placing the cylinder in the first rotational fixed position, placing the radiation source shell into the accommodating cavity through the cylinder entrance, and locking the cylinder entrance with the locking mechanism; Step 2: placing the cylinder in the second rotational fixed position, and unscrewing the cover of the radiation source shell through the cavity operation port; Step three: placing the barrel in the first rotational fixed position so that the radiation source falls into the container outside the barrel through the cavity operation port.

9. The method according to claim 8, characterized in that Also includes: Step 4, opening the locking mechanism, taking out the radiation source shell, and placing a second radiation source shell into the accommodating cavity through the cylinder entrance, and locking the cylinder entrance with the locking mechanism; Step 5, placing the cylinder in the second rotational fixed position, unscrewing the second cover of the second radiation source shell through the cavity operation port, inserting the radiation source, and then screwing on the second cover; Step six: place the cylinder in the first rotational fixed position, open the locking mechanism, and take out the second radiation source shell.

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