CN112985315B - Ultrasonic thickness gauge and detection method thereof - Google Patents
Ultrasonic thickness gauge and detection method thereof Download PDFInfo
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- CN112985315B CN112985315B CN202110196899.9A CN202110196899A CN112985315B CN 112985315 B CN112985315 B CN 112985315B CN 202110196899 A CN202110196899 A CN 202110196899A CN 112985315 B CN112985315 B CN 112985315B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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Abstract
The application relates to an ultrasonic thickness gauge, relating to the technical field of thickness measuring equipment; the thickness gauge comprises a thickness gauge body and a storage box, wherein the storage box is rotatably connected with a storage rod and a guide screw rod, the outside of the storage rod is wound and connected with a connecting wire, one end of the connecting wire is provided with a plug, the top of the thickness gauge is provided with a socket for the plug to be adaptive to plug-in, and the other end of the connecting wire is provided with a probe; a driving assembly for driving the containing rod to rotate and fixing the rotating position is arranged at one end of the containing rod, a linkage assembly for driving the containing rod and the guide screw rod to synchronously rotate is arranged between the containing rod and the guide screw rod, a guide block is sleeved on the outer part of the guide screw rod in a threaded manner, and a guide hole for a connecting wire to pass through is formed in the guide block in a penetrating manner; this application has the effect of realizing accomodating the stability of connecting wire and probe.
Description
Technical Field
The application relates to the technical field of thickness measuring equipment, in particular to an ultrasonic thickness gauge and a detection method thereof.
Background
The ultrasonic thickness gauge is used for detecting the thickness of an object, when the ultrasonic thickness gauge is used, a probe of the ultrasonic thickness gauge is horizontally placed on a measured object coated with a coupling agent, when an ultrasonic pulse transmitted by the probe reaches a material interface through the measured object, the pulse is reflected back to the probe, and the thickness of the measured material is determined by accurately measuring the propagation time of the ultrasonic in the material.
The Chinese patent with the related publication number of CN204807054U discloses an ultrasonic thickness gauge, which comprises a thickness gauge body internally provided with a singlechip and a probe, wherein the upper part of the front surface of the thickness gauge body is provided with a liquid crystal display screen which is electrically connected with the output end of the singlechip; when the thickness measuring instrument is used, the probe is horizontally arranged on a measured object coated with a coupling agent, then the thickness measuring instrument body is started through point touch operation of the keys, the probe is driven to transmit ultrasonic pulses to the measured object, and then the single chip microcomputer displays thickness data of the measured object on the liquid crystal display screen according to the time of reflecting the ultrasonic pulses back to the probe.
In view of the above-mentioned related technologies, the inventor believes that a main body of a general ultrasonic thickness measuring device is connected with a probe through a cable, and the cable and the probe of the ultrasonic thickness measuring instrument cannot be stored, so that the situation that the cable is scattered and wound or even knotted is easily caused in the using process, and the ultrasonic thickness measuring instrument is inconvenient to carry and store and needs to be improved.
Disclosure of Invention
In order to improve the technical problem that the cable and the probe of the ultrasonic thickness gauge in the related art are not convenient to store, the application provides an ultrasonic thickness gauge and a detection method thereof.
The application provides an ultrasonic thickness gauge adopts following technical scheme:
an ultrasonic thickness gauge comprises a thickness gauge body and a storage box, wherein a storage rod and a guide screw rod are rotatably connected inside the storage box, a connecting wire is wound outside the storage rod, a plug is arranged at one end of the connecting wire, a socket for the plug to be inserted in a matching mode is arranged at the top of the thickness gauge, and a probe is arranged at the other end of the connecting wire; accomodate pole wherein one end and be provided with and be used for driving its rotation and fixed rotational position's drive assembly, it is used for driving the synchronous pivoted linkage subassembly of accomodating pole and guide screw to accomodate to be provided with between pole and the guide screw, the outside screw thread of guide screw has cup jointed the guide block, run through on the guide block and set up the guiding hole that supplies the connecting wire to pass.
By adopting the technical scheme, when the ultrasonic thickness gauge needs to be used, only the plug needs to be inserted into the socket, and then the probe is pulled towards the direction far away from the storage box, at the moment, the connecting wire is partially pulled out of the storage box, and the storage rod and the guide screw rod rotate to realize paying off; when the connecting wire is accomodate to needs, accomodate the pole through drive assembly rotation, the linkage subassembly drives guide screw and rotates in the lump this moment to the drive guide block removes along guide screw length direction, in order to evenly the wire-wound joint of connecting wire on accomodating the pole, realizes receiving the line.
Optionally, the drive assembly includes rectangular block and fixed connection key on the rectangular block, the rectangular block end wall is seted up and is supplied the storage rod to insert the fixed slot of establishing, connection key fixed connection is in the fixed slot, the storage rod lateral wall is seted up and is supplied the keyway that the connection key slided, the rectangular hole that supplies the rectangular block to set is seted up to the storage box end wall.
By adopting the technical scheme, when the containing rod needs to be rotated, the rectangular block is taken out from the rectangular hole, then the rectangular block is rotated, and the containing rod is driven by the connecting key and the rectangular block to rotate in the circumferential direction; when the containing rod does not need to be rotated, the rectangular block is inserted into the rectangular hole to realize rotation stopping.
Optionally, the side wall of the rectangular block is provided with anti-slip lines.
Through adopting above-mentioned technical scheme, the friction on rectangular block and the staff contact surface has been increased in setting up of antiskid line to the fixed slot is taken out the rectangular block more fast conveniently to the operating personnel of being convenient for.
Optionally, a containing box is arranged on the side wall of the containing box close to the probe, a fixing hole for the connecting wire to penetrate through is jointly formed in the side wall of the containing box and the side wall of the containing box, the probe is located in the containing box, and a containing opening for the probe to be separated from the containing box is formed in the side wall of the containing box, which deviates from the fixing hole.
By adopting the technical scheme, when the probe is not needed to be used, the probe is positioned in the accommodating box, so that the probe is protected, the condition that the probe is damaged due to external abrasion or external impact is prevented, and the probe is stably accommodated.
Optionally, the inner wall that the containing box is close to fixed orifices department rotates and is connected with first lead screw and the second lead screw that the screw thread revolves to opposite, first lead screw and the outside respectively screw thread of second lead screw have cup jointed the slider, each the slider all articulates there is the connecting rod, two the connecting rod articulates jointly has the push pedal, the probe is located the push pedal and keeps away from one side of connecting rod department.
Through adopting above-mentioned technical scheme, rotate first lead screw and second lead screw so that two sliders move towards the direction of keeping away from each other, the push pedal moves towards the direction of being close to the accepting opening under the drive of connecting rod this moment to make the probe break away from the accepting box from the accepting opening under the support of push pedal, then handheld probe and pulling probe realize the unwrapping wire.
Optionally, the side wall of the push plate, which deviates from the connecting rod, is symmetrically provided with limiting plates, and the limiting plates are located on two sides of the probe.
Through adopting above-mentioned technical scheme, when the probe reinserts in the containing box, the limiting plate can play limiting displacement to the position of establishing of inserting of probe to make the probe tip laminate steadily in the push pedal, avoid the probe to empty and be not convenient for the push pedal next time and release the containing box with the probe.
Optionally, the symmetry that the accepting box is close to accepting opening department is provided with flip, and flip rotates through the axis of rotation to be connected on the accepting box, and the torsional spring has been cup jointed to the axis of rotation outside, and torsional spring wherein one end fixed connection is on the accepting box, and other end fixed connection is on the flip, the one end butt that the push pedal department was kept away from to the limiting plate is on the flip.
Through adopting above-mentioned technical scheme, during torsional spring initial state, flip is closed in accepting mouthful department to accomodate the probe in accepting the box firmly, when the push pedal promoted the probe and remove towards the direction that is close to accepting mouthful, thereby the limiting plate supports and pushes away flip and makes flip rotate towards the direction of keeping away from accepting mouthful, and the accepting mouthful is opened this moment, makes the probe break away from accepting the box.
Optionally, two mutually-oriented two side walls of the flip cover are respectively provided with a sponge.
Through adopting above-mentioned technical scheme, the sponge reduces flip on the one hand to the wearing and tearing of probe and connecting wire, and on the other hand also can clean the probe surface through flip.
Optionally, a connecting hole for the connecting wire to penetrate through is formed in the push plate in a penetrating mode, and the connecting hole, the fixing hole and the side wall of the guide hole are fixedly connected with rubber rings.
Through adopting above-mentioned technical scheme, the setting of rubber ring can play the protection connecting wire, reduces the wearing and tearing of fixed orifices, connecting hole and guiding hole inner wall to the connecting wire.
Optionally, a detection method adopted by the ultrasonic thickness gauge includes the following steps:
s1, firstly taking out the rectangular block from the rectangular groove, then rotating the first screw rod and the second screw rod to enable the push plate to push the probe towards the direction close to the containing port, at the moment, the flip cover is pushed open by the limiting plate, when the probe is positioned outside the containing box, the probe is pulled, and the connecting wire is pulled out under the driving of the probe.
S2, coating a couplant on the outer surface of the object to be measured, horizontally placing the probe on the outer surface of the object to be measured coated with the couplant, starting the thickness measuring instrument body, and measuring the thickness of the object to be measured;
s3, after detection is finished, rotating the rectangular block to drive the containing rod and the guide screw rod to rotate simultaneously, and moving the guide block along the length direction of the guide screw rod at the moment so as to uniformly wind the connecting wire on the containing rod;
s4, inserting the probe into the containing box, rotating the first screw rod and the second screw rod to drive the push plate to move towards the direction far away from the containing port, closing the turnover cover in the containing port, and finally inserting the rectangular block into the rectangular groove.
Through adopting above-mentioned technical scheme, when needs use the probe, rotate first lead screw and second lead screw to through the ejecting accepting box of push pedal with the probe, the rethread pulling probe realizes the direction, accomodates the pole and the guide screw can evenly wind the connecting wire in the accepting box through rotating, thereby give and finally realize receiving and releasing of connecting wire and the probe is for accomodating.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the ultrasonic thickness gauge needs to be used, only the plug needs to be inserted into the socket, and then the probe is pulled in the direction away from the storage box, at the moment, the connecting wire is partially pulled out of the storage box, and the storage rod and the guide screw rod rotate to realize paying off; when the connecting wires need to be stored, the storage rods are rotated through the driving assembly, and the linkage assembly drives the guide screw rods to rotate together, so that the guide blocks are driven to move along the length direction of the guide screw rods, the connecting wires are uniformly wound on the storage rods, and the wire collection is realized;
2. when the probe is not needed to be used, the probe is positioned in the accommodating box, so that the probe is protected, the condition that the probe is worn outside or damaged due to external force impact is prevented, and the probe is stably accommodated;
3. when the probe is needed to be used, the first screw rod and the second screw rod are rotated to enable the two sliding blocks to move towards the direction away from each other, and at the moment, the push plate moves towards the direction close to the containing opening under the driving of the connecting rod, so that the probe is separated from the containing box from the containing opening under the pushing of the push plate.
Drawings
FIG. 1 is a schematic structural diagram of an ultrasonic thickness gauge in the embodiment.
Fig. 2 is a sectional view showing an internal structure of the storage case and the housing case in the embodiment.
Fig. 3 is an exploded view showing a positional relationship between the storage rod and the rectangular block in the embodiment.
Fig. 4 is a partial schematic diagram for showing a positional relationship between the flip and the storage box in the embodiment.
Description of reference numerals: 1. a thickness gauge body; 11. a socket; 2. a connecting wire; 21. a plug; 22. a probe; 3. a storage box; 31. a storage rod; 311. a keyway; 32. a guide screw rod; 321. a guide block; 3211. a guide hole; 3212. a rubber ring; 33. a linkage assembly; 331. a driving gear; 332. a driven gear; 34. a drive assembly; 341. a rectangular block; 3411. a fixing groove; 3412. anti-skid lines; 342. a connecting bond; 35. a rectangular hole; 36. a fixing hole; 4. a box is accommodated; 41. a first lead screw; 411. a handle; 42. a second lead screw; 43. a slider; 44. a connecting rod; 45. pushing a plate; 451. connecting holes; 452. a limiting plate; 46. a receiving opening; 461. a cover is turned; 4611. sponge; 462. a torsion spring.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses ultrasonic thickness gauge. Referring to fig. 1 and 2, the ultrasonic thickness gauge comprises a thickness gauge body 1, a thickness gauge body 1 and a connecting wire 2, wherein one end of the connecting wire 2 is coupled with a plug 21, the plug 21 is inserted into a socket 11, and the other end of the connecting wire 2 is coupled with a probe 22; after the probe 22 is flatly placed on the outer surface of the object to be measured coated with the couplant, the thickness gauge body 1 is started to measure the thickness of the object to be measured.
Referring to fig. 2 and 3, the storage box 3 is further included, a storage rod 31 is rotatably connected inside the storage box 3, one end of the storage rod 31 penetrates through the end wall of the storage box 3, and a driving assembly 34 for driving the storage rod 31 to rotate and stop rotating is arranged at a position, close to the storage rod 31, of the storage box 3.
Referring to fig. 2 and 3, the driving assembly 34 includes a rectangular block 341 and a connecting key 342, a fixing groove 3411 for the receiving rod 31 to be inserted into is formed in an end wall of the rectangular block 341, the connecting key 342 is fixedly welded to an inner wall of the fixing groove 3411, a key slot 311 for the connecting key 342 to slide is formed in an outer side wall of the receiving rod 31, and the key slot 311 is arranged along a length direction of the receiving rod 31; the side wall of the storage box 3 is provided with a rectangular hole 35 for the rectangular block 341 to be inserted, and the side wall of the rectangular block 341 is symmetrically provided with anti-slip threads 3412 for taking out the rectangular block 341 from the rectangular hole 35.
Referring to fig. 2, a guide screw 32 is further rotatably connected in the storage box 3, a guide block 321 is sleeved on the outer thread of the guide screw 32, and a guide hole 3211 for the connecting wire 2 to pass through is formed in the guide block 321 in a penetrating manner; a linkage assembly 33 is jointly arranged between the guide screw rod 32 and the accommodating rod 31, the linkage assembly 33 comprises a driving gear 331 fixedly sleeved on the accommodating rod 31 and a driven gear 332 fixedly sleeved on the guide screw rod 32, and the driving gear 331 and the driven gear 332 are meshed with each other to realize the simultaneous rotation of the guide screw rod 32 and the accommodating rod 31.
Referring to fig. 2 and 4, an accommodating box 4 is further welded outside the accommodating box 3, a fixing hole 36 for the connection line 2 to pass through is formed in the side walls of the accommodating box 3 and the accommodating box 4 together, the probe 22 is located inside the accommodating box 4, an accommodating opening 46 is formed in the side wall of the accommodating box 4 away from the fixing hole 36, a position of the accommodating box 4 close to the accommodating opening 46 is rotatably connected with flip covers 461 through a rotating shaft, in the embodiment, the number of the flip covers 461 is 2, a torsion spring 462 is sleeved outside the rotating shaft, one end of the torsion spring 462 is fixedly welded on the flip cover 461, the other end of the torsion spring 462 is fixedly welded on the inner wall of the accommodating opening 46, and when the torsion spring 462 is in an initial state, the flip cover 461 is flush with the outer surface of the accommodating box 4; two side walls of the two flip covers 461 close to each other are respectively fixedly adhered with a sponge 4611.
Referring to fig. 2, a first screw rod 41 and a second screw rod 42 are rotatably connected in the accommodating box 4, the thread turning directions of the first screw rod 41 and the second screw rod 42 are opposite, the end portions of the first screw rod 41 and the second screw rod 42 are fixedly welded, and one end of the first screw rod 41, which is far away from the second screw rod 42, penetrates through the accommodating box 4 and is fixedly welded with a handle 411.
Referring to fig. 2, the first lead screw 41 and the second lead screw 42 are both in threaded sleeve connection with the sliders 43, each slider 43 is hinged with a connecting rod 44, the two connecting rods 44 are hinged with a push plate 45 together, a connecting hole 451 for inserting the connecting wire 2 is formed in the push plate 45 in a penetrating manner, and a rubber ring 3212 is fixedly bonded on the side walls of the guide hole 3211, the connecting hole 451 and the fixing hole 36; the push plate 45 is away from the side wall of the connecting rod 44 and is fixedly welded with a limiting plate 452 at the middle part thereof, the probe 22 is located between the limiting plates 452, and one end of the limiting plate 452 far away from the push plate 45 abuts against the flip cover 461.
A detection method of an ultrasonic thickness gauge comprises the following steps:
s1, firstly, the rectangular block 341 is taken out from the rectangular groove, then the first lead screw 41 and the second lead screw 42 are rotated to enable the push plate 45 to push the probe 22 towards the direction close to the containing port 46, at the moment, the flip cover 461 is pushed open by the limiting plate 452, when the probe 22 is positioned outside the containing box 4, the probe 22 is pulled, and the connecting wire 2 is pulled out under the driving of the probe 22.
S2, coating a couplant on the outer surface of the object to be measured, flatly placing the probe 22 on the outer surface of the object to be measured coated with the couplant, starting the thickness measuring instrument body 1, and measuring the thickness of the object to be measured;
s3, after detection is finished, the rectangular block 341 is rotated to drive the accommodating rod 31 and the guide screw rod 32 to rotate simultaneously, and at the moment, the guide block 321 moves along the length direction of the guide screw rod 32, so that the connecting wires 2 are uniformly wound on the accommodating rod 31;
s4, the probe 22 is inserted into the housing box 4, the first lead screw 41 and the second lead screw 42 are rotated to drive the push plate 45 to move in a direction away from the housing opening 46, the flip cover 461 is closed at the housing opening 46, and finally the rectangular block 341 is inserted into the rectangular groove.
The implementation principle of the ultrasonic thickness gauge of the embodiment of the application is as follows: firstly, the plug 21 is inserted into the socket 11, then the rectangular block 341 is taken out of the rectangular hole 35, then the handle 411 is rotated, so that the two sliding blocks 43 move in the direction away from each other, at this time, the push plate 45 pushes the probe 22 to move in the direction close to the accommodating port 46, in the process, the limiting plate 452 pushes the flip cover 461 in the direction away from the accommodating box 4, the accommodating port 46 is opened, and the probe 22 is separated from the accommodating port 46 from the accommodating box 4; then the probe 22 is pulled, the connecting wire 2 is pulled by the probe 22, and the storage rod 31 and the guide screw rod 32 are driven by the connecting wire 2 to rotate, so that the paying-off is realized.
Next, the probe 22 is horizontally placed on the outer surface of the to-be-detected object coated with the coupling agent, the thickness gauge body 1 is started to detect the thickness of the object, after the detection is completed, the rectangular block 341 is rotated to drive the accommodating rod 31 to rotate, the guide screw 32 is driven to rotate through the linkage assembly 33, so that the guide block 321 is driven to move towards the direction far away from the rectangular block 341, the probe 22 is inserted into the accommodating box 4 and placed on the push plate 45 in the wire winding process, the handle 411 is rotated to drive the push plate 45 to move towards the direction far away from the accommodating opening 46 until the probe 22 is completely inserted into the accommodating box 4, and the flip cover 461 covers the accommodating opening 46; when the guide block 321 is moved from a direction close to the rectangular block 341 to a direction away from the rectangular block 342, the connecting wire 2 can be wound around the storage rod 31, and finally the rectangular block 341 is inserted into the rectangular hole 35 to store the connecting wire 2 and the probe 22.
The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (5)
1. An ultrasonic thickness gauge, its characterized in that: the thickness gauge comprises a thickness gauge body (1) and a storage box (3), wherein the storage box (3) is connected with a storage rod (31) and a guide screw rod (32) in a rotating mode, the outside of the storage rod (31) is connected with a connecting wire (2) in a winding mode, one end of the connecting wire (2) is provided with a plug (21), the top of the thickness gauge is provided with a socket (11) for the plug (21) to be adaptive and spliced, and the other end of the connecting wire (2) is provided with a probe (22); a driving assembly (34) for driving the storage rod (31) to rotate and fixing the rotating position is arranged at one end of the storage rod (31), a linkage assembly (33) for driving the storage rod (31) and the guide screw rod (32) to synchronously rotate is arranged between the storage rod (31) and the guide screw rod (32), a guide block (321) is sleeved on the outer thread of the guide screw rod (32), and a guide hole (3211) for a connecting wire (2) to pass through is formed in the guide block (321) in a penetrating manner; an accommodating box (4) is arranged on the side wall of the accommodating box (3) close to the probe (22), a fixing hole (36) for the connecting wire (2) to penetrate through is formed in the side walls of the accommodating box (4) and the accommodating box (3), the probe (22) is located in the accommodating box (4), and an accommodating opening (46) for the probe (22) to be separated from the accommodating box (4) is formed in the side wall of the accommodating box (4) away from the fixing hole (36); the inner wall of the containing box (4) close to the fixing hole (36) is rotatably connected with a first screw rod (41) and a second screw rod (42) which are opposite in thread turning direction, the outer parts of the first screw rod (41) and the second screw rod (42) are respectively in threaded sleeve connection with sliding blocks (43), each sliding block (43) is hinged with a connecting rod (44), the two connecting rods (44) are hinged with a push plate (45) together, and the probe (22) is positioned on one side of the push plate (45) far away from the connecting rods (44); limiting plates (452) are symmetrically arranged on the side wall of the push plate (45) away from the connecting rod (44), and the limiting plates (452) are positioned on two sides of the probe (22); the containing box (4) is symmetrically provided with flip covers (461) close to the containing opening (46), the flip covers (461) are rotatably connected to the containing box (4) through a rotating shaft, a torsion spring (462) is sleeved outside the rotating shaft, one end of the torsion spring (462) is fixedly connected to the containing box (4), the other end of the torsion spring is fixedly connected to the flip covers (461), and one end of the limiting plate (452) far away from the push plate (45) is abutted to the flip covers (461); two opposite side walls of the two turnover covers (461) are respectively provided with a sponge (4611).
2. An ultrasonic thickness gauge according to claim 1, wherein: the driving assembly (34) comprises a rectangular block (341) and a connecting key (342) fixedly connected to the rectangular block (341), a fixing groove (3411) for accommodating the rod (31) to be inserted is formed in the end wall of the rectangular block (341), the connecting key (342) is fixedly connected to the fixing groove (3411), a key groove (311) for allowing the connecting key (342) to slide is formed in the outer side wall of the accommodating rod (31), and a rectangular hole (35) for allowing the rectangular block (341) to be embedded is formed in the end wall of the accommodating box (3).
3. An ultrasonic thickness gauge according to claim 2, wherein: the side wall of the rectangular block (341) is provided with anti-skid grains (3412).
4. The ultrasonic thickness gauge according to claim 1, wherein: the push plate (45) is provided with a connecting hole (451) for the connecting wire (2) to penetrate through, and the side walls of the connecting hole (451), the fixing hole (36) and the guide hole (3211) are fixedly connected with a rubber ring (3212).
5. A method of measuring a thickness using an ultrasonic thickness gauge according to any one of claims 2 or 3, wherein: the method comprises the following steps:
s1, firstly taking out a rectangular block (341) from a rectangular hole (35), then rotating a first screw rod (41) and a second screw rod (42) to enable a push plate (45) to push a probe (22) towards a direction close to an accommodating opening (46), wherein a flip cover (461) is pushed open by a limit plate (452), and when the probe (22) is located outside an accommodating box (4), pulling the probe (22), and drawing out a connecting wire (2) under the driving of the probe (22);
s2, coating a couplant on the outer surface of the object to be measured, horizontally placing the probe (22) on the outer surface of the object to be measured coated with the couplant, starting the thickness gauge body (1), and measuring the thickness of the object to be measured;
s3, after detection is finished, the rectangular block (341) is rotated to drive the accommodating rod (31) and the guide screw rod (32) to rotate simultaneously, and the guide block (321) moves along the length direction of the guide screw rod (32) at the moment, so that the connecting wires (2) are uniformly wound on the accommodating rod (31);
s4, the probe (22) is inserted into the containing box (4), the first screw rod (41) and the second screw rod (42) are rotated to drive the push plate (45) to move towards the direction away from the containing opening (46), the flip cover (461) is closed on the containing opening (46), and finally the rectangular block (341) is inserted into the rectangular hole (35).
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| CN202110196899.9A CN112985315B (en) | 2021-02-22 | 2021-02-22 | Ultrasonic thickness gauge and detection method thereof |
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| CN202110196899.9A CN112985315B (en) | 2021-02-22 | 2021-02-22 | Ultrasonic thickness gauge and detection method thereof |
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| CN113484414B (en) * | 2021-07-01 | 2023-05-19 | 上海市市政公路工程检测有限公司 | Method for surveying gap of inner wall of closed body |
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