CN214989417U - Special electric cable loading and unloading device for geophysical logging with high safety coefficient - Google Patents
Special electric cable loading and unloading device for geophysical logging with high safety coefficient Download PDFInfo
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- CN214989417U CN214989417U CN202121573766.0U CN202121573766U CN214989417U CN 214989417 U CN214989417 U CN 214989417U CN 202121573766 U CN202121573766 U CN 202121573766U CN 214989417 U CN214989417 U CN 214989417U
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Abstract
The utility model discloses a special electric handling cable device of geophysical logging that factor of safety is high, the on-line screen storage device comprises a base, the left side bolt joint at the base top back has the backup pad, the left side bolt joint of backup pad has first motor, the output of first motor runs through the backup pad and the bolt has the bull stick, the surface of bull stick has set gradually fixed plate and rolling cylinder from a left side to the right side, the front bolt of base has the regulating box, the inner chamber of regulating box is provided with protection machanism and complementary unit. The utility model discloses a through setting up protection machanism, utilize the second motor as the driving source, can promote second thread bush and removal seat synchronous motion under the rotation of lead screw is supplementary to it can drive and carry the arm-tie to shift up or move down to push the carriage release lever under the supplementary of sliding seat when moving on the right side or moving on the left side, and then can drive flexible post and fixed frame and move, thereby can adjust the rate of tension of cable as required, improved factor of safety.
Description
Technical Field
The utility model belongs to the technical field of the geophysical logging, more specifically say, it relates to a special electronic loading and unloading cable assembly of geophysical logging that factor of safety is high.
Background
Geophysical logging, called logging for short, is that in the process of exploration and exploitation of petroleum, coal and metal ore bodies, various instruments are used to measure the physical parameters of underground rock stratum and the technical conditions of the well, and the recorded data are analyzed to conduct the research on geology and engineering, and in the logging of oil and gas fields, the logging data are mainly used for stratum comparison and the division of oil, gas and water layers; determining important parameters such as porosity, oil saturation, permeability and the like of a reservoir layer; in the development process of oil and gas fields, the dynamic states of oil, gas and water and the well conditions are researched, and a basis is provided for formulating a development scheme.
Need use the cable when geophysical logging, because the cable that needs is longer, the user can utilize electric handling cable equipment to carry out the rolling with the cable and dismantle, however traditional electric handling cable device can't adjust the rate of tension of cable when rolling or release, the cable is if be in the state of tightening, excessive pulling can make the cable break, thereby can bring very big potential safety hazard for peripheral personnel, factor of safety is extremely low, consequently, the technical staff in the field provides the special electric handling cable device of geophysical logging of a high factor of safety, in order to solve the problem that proposes in the above-mentioned background art.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a special electric handling cable device of geophysical logging that factor of safety is high can adjust the rate of tension of cable, has improved factor of safety, avoids the cable to split because the tension is tight when rolling or release to bring the potential safety hazard for peripheral personnel.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a special electric cable loading and unloading device for geophysical logging with high safety coefficient comprises a base, wherein a supporting plate is bolted on the left side of the back surface of the top of the base, the left side of the supporting plate is in bolt connection with a first motor, the output end of the first motor penetrates through the supporting plate and is in bolt connection with a rotating rod, the surface of the rotating rod is provided with a fixed plate and a rolling roller from left to right in sequence, the top and the bottom of the right side of the fixed plate are bolted with clamping rods, a clamping groove matched with the clamping rod for use is arranged on the left side of the rolling roller, a first thread sleeve is meshed on the right side of the surface of the rotating rod through threads, the left side of the first thread sleeve is attached to the right side of the rolling roller, the front surface of the base is bolted with an adjusting box, the inner cavity of the adjusting box is provided with a protection mechanism and an auxiliary mechanism, the top of the protection mechanism is provided with a telescopic column, and the top of the telescopic column penetrates through the adjusting box and is fixedly connected with a fixing frame;
through above-mentioned technical scheme, the cooperation of kelly and draw-in groove can carry out joint spacing in advance to the rolling cylinder, and threaded connection through first thread bush and bull stick surface can carry out the secondary spacing to the rolling cylinder simultaneously, and protection machanism utilizes the second motor to drive the lifting plate and goes up and down to can promote flexible post and fixed frame and go up and down to the cable, and then adjust the elasticity of cable, avoid the cable to collapse absolutely.
Furthermore, the protection mechanism comprises a second motor, the right side of the second motor is fixedly connected to the left side of the bottom of the adjusting box, the output end of the second motor penetrates into the adjusting box and is fixedly connected with a lead screw, the bottoms of the two sides of the inner cavity of the adjusting box are fixedly connected with a square rod, a stop block is arranged at the center of the square rod, the left side of the stop block is rotatably connected with one end of the lead screw through a bearing, the left side of the surface of the square rod is slidably connected with a moving seat, the back of the moving seat is fixedly connected with a second threaded sleeve, the inner ring of the second threaded sleeve is in threaded connection with the surface of the lead screw, the top of the moving seat is movably connected with a moving rod through a movable seat, one end of the moving rod is rotatably connected with a lifting plate through a movable seat, and the top of the lifting plate is fixedly connected with the bottom of the telescopic column;
through above-mentioned technical scheme, protection machanism utilizes the second motor to drive the lead screw and rotates to push the carriage release lever under the assistance of second thread bush and removal seat and can drive and carry the lifter plate and shift up or move down when moving on the right side or moving on the left side, and then can drive flexible post and fixed frame and remove, thereby can adjust the rate of tension of cable as required, avoid the cable because the tension is cracked when rolling or release, thereby bring the potential safety hazard for peripheral personnel.
Furthermore, the auxiliary mechanism comprises a guide rotating shaft, two ends of the guide rotating shaft are rotatably connected with a fixed seat through bearings, the left side of the fixed seat is in bolted connection with the bottom of the left side of the inner cavity of the adjusting box, the right side of the surface of the square rod is in sliding connection with a sliding block, the bottom of the left side of the sliding block is provided with a belt, one end of the belt is in transmission connection with the surface of the guide rotating shaft, one end of the belt, far away from the guide rotating shaft, is arranged at the bottom of the left side of the moving seat, the right side of the sliding block is in bolted connection with a spring, one end of the spring is fixedly connected to the right side of the inner cavity of the adjusting box, the top of the sliding block is rotatably connected with an auxiliary guide rod through a movable seat, and one end of the auxiliary guide rod is rotatably connected with the bottom of the lifting plate through a movable seat;
through above-mentioned technical scheme, remove the seat when removing, can drag the sliding block under the supplementary of belt and carry out reverse movement to usable supplementary guide bar drives and carries the arm-tie steady movement, and the elasticity of usable spring is rebounded simultaneously, drives the sliding block and resets fast.
Furthermore, cross-shaped slideways are arranged on the right side of the top of the base along the front-back direction, the inner walls of the cross-shaped slideways are connected with cross-shaped sliding plates in a sliding mode, a placing seat is fixedly connected to the top of each cross-shaped sliding plate, an arc-shaped groove matched with the rotary rod for use is formed in the top of each placing seat, a hoop is fixedly connected to the top of each placing seat through bolts, and the inner wall of each hoop is movably connected with the surface of the rotary rod;
through above-mentioned technical scheme, cross slide and cross slide can carry out joint spacing in advance to placing the seat, and it can support and spacing to the rotating-barrel to place seat and clamp simultaneously, and supplementary rolling cylinder can rotate steadily.
Furthermore, two sides of the inner cavity of the adjusting box are fixedly connected with L-shaped limiting rods from front to back, and one end of each L-shaped limiting rod penetrates through the pull plate and is fixedly connected with the top of the inner cavity of the adjusting box;
through the technical scheme, the L-shaped limiting rod can limit the sliding of the lifting plate, so that the lifting plate is prevented from shifting or inclining up and down when moving.
Furthermore, the tops of the front side and the back side of the adjusting box are fixedly connected with supporting frames, and inner cavities of the supporting frames are rotatably connected with rotating shafts through bearings from front to back;
through above-mentioned technical scheme, the rotation axis can carry out the diversion to the cable, prevents that the cable from excessively rubbing with the top of regulating box when the transmission, causing the cable to damage.
Furthermore, the top and the bottom of the inner cavity of the fixed frame are both fixedly connected with arc-shaped plates, and the right side of the placing seat is sequentially and fixedly connected with a handle from front to back;
through above-mentioned technical scheme, the arc can effectively avoid the cable to excessively wear and tear with the inner chamber of fixed frame, and the handle can conveniently be taken out the seat of placing simultaneously and is separated, has improved work efficiency.
To sum up, the utility model discloses following beneficial effect has:
1. through setting up protection machanism, utilize the second motor as the driving source, can promote second thread bush and removal seat synchronous motion under the rotation of lead screw is supplementary, thereby it can drive and carry the lifter to move up or move down to move the arm-tie when moving on the right side or moving on the left side to push the movable seat under the supplementary of movable seat, and then can drive flexible post and fixed frame and remove, thereby can adjust the rate of tension of cable as required, if the cable is too tight, only need move down fixed frame, can alleviate the tight state of cable, safety factor has been improved, avoid the cable because tight and fracture when rolling or release, thereby bring the potential safety hazard for peripheral personnel.
2. By arranging the auxiliary mechanism, the moving seat can pull the sliding block to move reversely under the assistance of the belt and the guide rotating shaft while moving, so that the auxiliary guide rod can be driven to move under the assistance of the moving seat, and then the moving seat can be matched with the moving rod to drive the lifting plate to move smoothly, by arranging the cross slide way, the cross slide plate, the placing seat and the clamp, the placing seat can be clamped and limited in advance by the matched use of the cross slide plate and the cross slide way, the placing seat is convenient to install, and the placing seat and the clamp can support and limit the rotating rod so as to support the rolling roller and assist the rolling roller to rotate stably, by arranging the L-shaped limiting rod, the lifting plate can be limited in sliding, the stability of the lifting plate during moving is improved, the lifting plate is prevented from deviating or inclining up and down when moving, the moving effect of the lifting plate on the telescopic column is influenced, by arranging the supporting frame and the rotating shaft, can carry out the diversion to the cable, prevent that the cable from when the transmission from excessively rubbing with the top of regulating box, causing wearing and tearing, through setting up the arc, avoid the cable to excessively wear and tear with the inner chamber of fixed frame, through setting up the handle, can conveniently take out from placing the seat to dismantle the rolling cylinder fast.
Drawings
FIG. 1 is a schematic structural view of the present embodiment;
FIG. 2 is a sectional view showing the structure of an adjusting box according to the present embodiment;
FIG. 3 is an exploded view of the rotary rod, clip and second threaded sleeve of the present embodiment;
fig. 4 is a partial perspective view of the guard mechanism and the structure of the guard mechanism of the present embodiment.
Description of reference numerals: 1. a base; 2. a support plate; 3. a first motor; 4. rotating the rod; 5. a fixing plate; 6. a clamping rod; 7. a winding roller; 8. a first threaded sleeve; 9. a placing seat; 10. clamping a hoop; 11. a cross slide way; 12. a cross slide plate; 13. an adjusting box; 14. a rotating shaft; 15. a protection mechanism; 151. a second motor; 152. a screw rod; 153. a square rod; 154. a movable seat; 155. a second threaded sleeve; 156. a travel bar; 157. lifting the plate; 16. a telescopic column; 17. a fixing frame; 18. an L-shaped limiting rod; 19. a stopper; 20. an auxiliary mechanism; 201. a guide rotating shaft; 202. a belt; 203. a slider; 204. a spring; 205. an auxiliary guide bar.
Detailed Description
Example (b):
the present invention will be described in further detail with reference to the accompanying fig. 1-4.
A high-safety-factor electric cable handling device special for geophysical logging comprises a base 1, a supporting plate 2 is bolted on the left side of the back face of the top of the base 1, a first motor 3 is bolted on the left side of the supporting plate 2, the output end of the first motor 3 penetrates through the supporting plate 2 and is bolted with a rotating rod 4, cross slideways 11 are arranged on the right side of the top of the base 1 along the front-back direction, cross sliding plates 12 are slidably connected to the inner walls of the cross slideways 11, a placing seat 9 is fixedly connected to the top of each cross sliding plate 12, an arc-shaped groove matched with the rotating rod 4 for use is arranged on the top of each placing seat 9, a hoop 10 is fixedly connected to the top of each placing seat 9 through bolts, the inner walls of the hoop 10 are movably connected with the surfaces of the rotating rods 4, the cross slideways 11, the cross sliding plates 12, the placing seats 9 and the hoop 10 are arranged, and the pre-clamping limiting can be carried out on the placing seats 9 through the matching use of the cross sliding plates 12 and the cross slideways 11, the placing seat 9 is convenient to install, the placing seat 9 and the hoop 10 can support and limit the rotating rod 4 at the same time, so that the winding roller 7 is supported and assisted to rotate stably, the right side of the placing seat 9 is fixedly connected with a handle in sequence from front to back, the placing seat 9 can be conveniently drawn away by arranging the handle, so that the winding roller 7 is rapidly disassembled, the surface of the rotating rod 4 is sequentially provided with the fixing plate 5 and the winding roller 7 from left to right, the top and the bottom of the right side of the fixing plate 5 are respectively bolted with the clamping rod 6, the left side of the winding roller 7 is provided with a clamping groove matched with the clamping rod 6, the right side of the surface of the rotating rod 4 is meshed with the first threaded sleeve 8 through threads, the left side of the first threaded sleeve 8 is attached to the right side of the winding roller 7, the front of the base 1 is bolted with the adjusting box 13, and the tops of the front and the back of the adjusting box 13 are respectively and fixedly connected with a supporting frame, and the inner chamber of support frame all loops through the bearing in the past to the back and rotates and be connected with rotation axis 14, through setting up support frame and rotation axis 14, can carry out the diversion to the cable, prevent the cable when the transmission with the top excessive friction of regulating box 13, cause wearing and tearing, the inner chamber of regulating box 13 is provided with protection machanism 15 and complementary unit 20, the top of protection machanism 15 is provided with flexible post 16, the top of flexible post 16 runs through the fixed frame 17 of regulating box 13 and fixedly connected with, the top and the equal fixedly connected with arc in bottom of the fixed frame 17 inner chamber, through setting up the arc, avoid the cable and the inner chamber excessive wear of fixed frame 17.
The protection mechanism 15 comprises a second motor 151, the right side of the second motor 151 is fixedly connected to the left side of the bottom of the adjusting box 13, the output end of the second motor 151 penetrates into the adjusting box 13 and is fixedly connected with a screw rod 152, the bottoms of the two sides of the inner cavity of the adjusting box 13 are fixedly connected with a square rod 153, a stop 19 is arranged at the center of the square rod 153, the left side of the stop 19 is rotatably connected with one end of the screw rod 152 through a bearing, the left side of the surface of the square rod 153 is slidably connected with a moving seat 154, the back of the moving seat 154 is fixedly connected with a second threaded sleeve 155, the inner ring of the second threaded sleeve 155 is in threaded connection with the surface of the screw rod 152, the top of the moving seat 154 is movably connected with a moving rod 156 through a moving seat, one end of the moving rod 156 is rotatably connected with a lifting plate 157 through a moving seat, the top of the lifting plate 157 is fixedly connected with the bottom of the telescopic column 16, the two sides of the inner cavity of the adjusting box 13 are sequentially and fixedly connected with L-shaped limit rods 18 from front to back, one end of the L-shaped limiting rod 18 penetrates through the lifting plate 157 and is fixedly connected with the top of the inner cavity of the adjusting box 13, the L-shaped limiting rod 18 is arranged, the lifting plate 157 can be limited in a sliding mode, the stability of the lifting plate 157 in moving is improved, the phenomenon that the lifting plate 157 deviates or tilts up and down in moving is avoided, the moving effect of the lifting plate 157 on the telescopic column 16 is influenced, the protective mechanism 15 is arranged, the second motor 151 is used as a driving source, the second threaded sleeve 155 and the moving seat 154 can be pushed to move synchronously under the rotation assistance of the screw rod 152, the moving rod 156 can be pushed under the assistance of the moving seat to move on the right side or on the left side, the lifting plate 157 can be driven to move up or down, the telescopic column 16 and the fixing frame 17 can be driven to move, the tension degree of the cable can be adjusted according to needs, if the cable is too tight, the tight state of the cable can be relieved by only moving the fixing frame 17 down, the safety factor is improved, and the cable is prevented from being broken due to tightness when being wound or released, so that potential safety hazards are brought to peripheral personnel.
The auxiliary mechanism 20 comprises a guide rotating shaft 201, both ends of the guide rotating shaft 201 are rotatably connected with fixed seats through bearings, the left side of each fixed seat is bolted with the bottom on the left side of the inner cavity of the adjusting box 13, the right side of the surface of the square rod 153 is slidably connected with a sliding block 203, the bottom on the left side of the sliding block 203 is provided with a belt 202, one end of the belt 202 is in transmission connection with the surface of the guide rotating shaft 201, one end of the belt 202, far away from the guide rotating shaft 201, is arranged at the bottom on the left side of a moving seat 154, the right side of the sliding block 203 is in bolted connection with a spring 204, one end of the spring 204 is fixedly connected to the right side of the inner cavity of the adjusting box 13, the top of the sliding block 203 is rotatably connected with an auxiliary guide rod 205 through a moving seat, one end of the auxiliary guide rod 205 is rotatably connected with the bottom of the lifting plate 157 through a moving seat, through the auxiliary mechanism 20, the moving seat 154 can pull the sliding block 203 to reversely move under the assistance of the belt 202 and the guide rotating shaft 201 while moving, therefore, the auxiliary guide rod 205 can be driven to move with the aid of the movable seat, and the lifting plate 157 can be driven to move smoothly by matching with the movable rod 156.
The working principle is as follows: the user firstly sleeves the winding roller 7 on the surface of the rotating rod 4 until the clamping groove on the left side of the winding roller 7 is clamped with the clamping rod 6, then the user holds the handle, the cross slide plate 12 at the bottom of the placing seat 9 is inserted into the cross slide way 11, the right side of the rotating rod 4 is placed in the arc-shaped groove, meanwhile, the user clamps the hoop 10 on the surface of the rotating rod 4 and fixes the hoop by using the bolt, at this time, the user starts the second motor 151, the second motor 151 drives the screw rod 152 to rotate, thereby driving the second thread sleeve 155 and the moving seat 154 to move right at the same time, meanwhile, the moving seat 154 pulls the belt 202 to the right side, at this time, under the change of the guiding rotating shaft 201, the belt 202 synchronously pulls the sliding block 203 to the left side, simultaneously can pull the spring 204, and when the moving seat 154 and the sliding block 203 move reversely, the moving rod 156 and the auxiliary guiding rod 205 can be driven to push the pulling plate 157 to rise at the same time, thereby drive flexible post 16 and fixed frame 17 and move up in step, and then drive the cable and shift up, remove the cable to suitable position, the user opens first motor 3 afterwards, thereby drive rotary rod 4 and rolling cylinder 7 and rotate, roll up or release the cable, if the cable is too tight, the same thing, the user only needs to utilize second motor 151 antiport this moment, and then drive and carry the arm-tie 157 to move down, thereby make flexible post 16 and fixed frame 17 drive the cable and move down in step, and then adjust the elasticity of cable, safety factor is improved, avoid the cable to break because tight when rolling or release, thereby bring the potential safety hazard for peripheral personnel.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a special electronic handling cable device of geophysical logging that factor of safety is high, includes base (1), its characterized in that: the left side of the back of the top of the base (1) is bolted with a support plate (2), the left side of the support plate (2) is bolted with a first motor (3), the output end of the first motor (3) penetrates through the support plate (2) and is bolted with a rotary rod (4), the surface of the rotary rod (4) is sequentially provided with a fixed plate (5) and a rolling roller (7) from left to right, the top and the bottom of the right side of the fixed plate (5) are both bolted with clamping rods (6), the left side of the rolling roller (7) is provided with a clamping groove matched with the clamping rods (6) for use, the right side of the surface of the rotary rod (4) is engaged with a first thread sleeve (8) through threads, the left side of the first thread sleeve (8) is attached to the right side of the rolling roller (7), the front of the base (1) is bolted with an adjusting box (13), and the inner cavity of the adjusting box (13) is provided with a protection mechanism (15) and an auxiliary mechanism (20), the top of protection machanism (15) is provided with flexible post (16), the top of flexible post (16) runs through regulating box (13) and the fixed frame of fixedly connected with (17).
2. The special electric loading and unloading cable device for geophysical logging with high safety factor as claimed in claim 1, is characterized in that: the protection mechanism (15) comprises a second motor (151), the right side of the second motor (151) is fixedly connected to the left side of the bottom of the adjusting box (13), the output end of the second motor (151) penetrates into the adjusting box (13) and is fixedly connected with a lead screw (152), square rods (153) are fixedly connected to the bottoms of the two sides of the inner cavity of the adjusting box (13), a stop block (19) is arranged at the center of each square rod (153), the left side of each stop block (19) is rotatably connected with one end of the lead screw (152) through a bearing, a moving seat (154) is slidably connected to the left side of the surface of each square rod (153), a second thread sleeve (155) is fixedly connected to the back of the moving seat (154), the inner ring of the second thread sleeve (155) is in threaded connection with the surface of the lead screw (152), and a moving rod (156) is movably connected to the top of the moving seat (154), one end of the movable rod (156) is rotatably connected with a lifting plate (157) through a movable seat, and the top of the lifting plate (157) is fixedly connected with the bottom of the telescopic column (16).
3. The special electric loading and unloading cable device for geophysical logging with high safety factor as claimed in claim 2, wherein: the auxiliary mechanism (20) comprises a guide rotating shaft (201), two ends of the guide rotating shaft (201) are rotatably connected with a fixed seat through bearings, the left side of the fixed seat is bolted with the bottom of the left side of the inner cavity of the adjusting box (13), the right side of the surface of the square rod (153) is connected with a sliding block (203) in a sliding way, a belt (202) is arranged at the bottom of the left side of the sliding block (203), one end of the belt (202) is in transmission connection with the surface of the guide rotating shaft (201), one end of the belt (202) far away from the guide rotating shaft (201) is arranged at the bottom of the left side of the moving seat (154), the right side of the sliding block (203) is bolted with a spring (204), one end of the spring (204) is fixedly connected with the right side of the inner cavity of the adjusting box (13), the top of the sliding block (203) is rotationally connected with an auxiliary guide rod (205) through a movable seat, one end of the auxiliary guide rod (205) is rotatably connected with the bottom of the lifting plate (157) through a movable seat.
4. The special electric loading and unloading cable device for geophysical logging with high safety factor as claimed in claim 1, is characterized in that: base (1) top right side all is equipped with cross slide (11) along the fore-and-aft direction, the inner wall sliding connection of cross slide (11) has cross slide (12), seat (9) are placed to the top fixedly connected with of cross slide (12), the top of placing seat (9) is equipped with the arc wall that cooperation rotary rod (4) used, the top of placing seat (9) is through the surface swing joint of the inner wall of bolt fixedly connected with clamp (10) and rotary rod (4).
5. The special electric loading and unloading cable device for geophysical logging with high safety factor as claimed in claim 1, is characterized in that: the both sides of regulating box (13) inner chamber all fixedly connected with L type gag lever post (18) in proper order from the past to the back, the one end of L type gag lever post (18) run through and carry out arm-tie (157) and with the top fixed connection of regulating box (13) inner chamber.
6. The special electric loading and unloading cable device for geophysical logging with high safety factor as claimed in claim 1, is characterized in that: the top of the front surface and the top of the back surface of the adjusting box (13) are fixedly connected with supporting frames, and inner cavities of the supporting frames are connected with a rotating shaft (14) in a rotating mode through bearings from front to back in sequence.
7. The high-safety-factor electric loading and unloading cable device special for geophysical logging is characterized by comprising the following components in parts by weight: the top and the bottom of the inner cavity of the fixed frame (17) are fixedly connected with arc-shaped plates, and the right side of the placing seat (9) is fixedly connected with a handle in sequence from the front to the back.
Priority Applications (1)
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CN202121573766.0U CN214989417U (en) | 2021-07-12 | 2021-07-12 | Special electric cable loading and unloading device for geophysical logging with high safety coefficient |
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CN202121573766.0U CN214989417U (en) | 2021-07-12 | 2021-07-12 | Special electric cable loading and unloading device for geophysical logging with high safety coefficient |
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CN214989417U true CN214989417U (en) | 2021-12-03 |
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CN202121573766.0U Active CN214989417U (en) | 2021-07-12 | 2021-07-12 | Special electric cable loading and unloading device for geophysical logging with high safety coefficient |
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2021
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