CN212274890U - Road crack detection equipment - Google Patents
Road crack detection equipment Download PDFInfo
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- CN212274890U CN212274890U CN202021160801.1U CN202021160801U CN212274890U CN 212274890 U CN212274890 U CN 212274890U CN 202021160801 U CN202021160801 U CN 202021160801U CN 212274890 U CN212274890 U CN 212274890U
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- road crack
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- 238000001514 detection method Methods 0.000 title claims abstract description 53
- 239000000523 sample Substances 0.000 claims abstract description 66
- 230000002457 bidirectional effect Effects 0.000 claims description 24
- 230000005611 electricity Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 27
- 239000007787 solid Substances 0.000 description 8
- 238000009434 installation Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
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- 230000008439 repair process Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to a road crack detection equipment belongs to road detection equipment technical field, provides following technical scheme to the detection problem that can not use same detection equipment to realize the road to different width, the technical essential of the utility model includes the base that the level set up, the upper surface of base is provided with the detector, the lower surface of base is provided with four supporting legs, and four supporting legs are the rectangular array and distribute, are provided with the diaphragm between two adjacent supporting legs, diaphragm and base parallel arrangement, diaphragm and supporting leg sliding connection; the diaphragm is provided with two detecting probes, the diaphragm is provided with a driving assembly for driving the two sliding blocks to be close to or away from each other, and the detecting probes and the detector are electrically connected through electric wires. The utility model has the advantages of realize detecting different width roads through a detector.
Description
Technical Field
The utility model relates to a road check out test set technical field, in particular to road crack check out test set.
Background
Urban road, highway and bridge road surface etc. are all laid by pitch and form bituminous paving, because the effect of driving load and the influence of natural factor, can produce the crack on the bituminous paving, if the crack is untimely to repair, then can produce the road surface pit to cause deeper damage to bituminous paving, and still can influence driving safety, adopt road crack detector to detect the road crack among the prior art in order to solve this type of problem usually.
Current patent document that grant bulletin number is CN210346600U discloses a road crack check out test set, which comprises a supporting plate, fixed mounting all around of backup pad upper surface has the guard plate, the last fixed surface of backup pad installs yielding rubber, yielding rubber's top and the lower fixed surface of instrument frame are connected, the middle part sliding connection of instrument frame upper surface has the mount, the quantity of mount is two, and connects through the elastic component between two mounts, the detector has been placed to the central authorities of instrument frame upper surface, the lower fixed surface of backup pad installs the supporting leg.
Although this road crack check out test set adjusts the height of piston rod through rotating the support, reachs suitable proportion and makes the result of detection more clear to reacing specific height through the scale of observing the scale plate, combining the proportion net can calculate the width of crack, reduced the step of measuring the crack.
However, the road width actually detected by the road crack detector is not uniform, and when the road crack detecting device is used to detect a road with a non-uniform width, the position of the detecting probe needs to be adjusted. Because this road crack check out test set's test probe and fastening clip fixed connection for the distance between two test probes is unadjustable, thereby can not use same check out test set to realize the detection to the road of different width.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a road crack check out test set, it has the advantage of realizing detecting different width roads through a detector.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a road crack detection device comprises a horizontally arranged base, wherein a detector is arranged on the upper surface of the base, four supporting legs are arranged on the lower surface of the base, the four supporting legs are distributed in a rectangular array, a transverse plate is arranged between every two adjacent supporting legs, the transverse plate and the base are arranged in parallel, and the transverse plate is connected with the supporting legs in a sliding mode; the diaphragm is provided with two detecting probes, the diaphragm is provided with a driving assembly for driving the two sliding blocks to be close to or away from each other, and the detecting probes and the detector are electrically connected through electric wires.
Through adopting the technical scheme, when needing to use the utility model discloses when examining the road crack, earlier along the vertical length direction of supporting leg to the one side removal diaphragm that is close to the road surface, the diaphragm drives test probe synchronous motion, when test probe removes to the migration distance, open the detector, the detector passes through test probe to road surface transmission vibration energy, vibration energy spreads in the road, when passing the crack, vibration energy produces the diffraction at the crack endpoint, diffraction angle and crack depth have the geometric relation, crack depth value and receipt wave are with the screen display when using the detector, thereby realize cracked detection; when the road with different widths needs to be detected, the distance between the two detection probes is adjusted through the driving assembly to be matched with the road with different widths, and the distance between the two detection probes is adjustable, so that the road with different widths can be detected by one detector.
The utility model discloses further set up to: the diaphragm has seted up the hole that slides along its horizontal length direction, the downthehole portion that slides is provided with the sliding block, sliding block and the hole sliding connection that slides, detecting probe and sliding block synchronous motion.
By adopting the technical scheme, the detection probes and the sliding blocks synchronously move, the sliding connection between the detection probes and the transverse plate is realized in the process that the sliding blocks move along the transverse plate, and the distance between the two detection probes can be adjusted by adjusting the distance between the two sliding blocks; the detection probe is connected with the sliding hole in a sliding mode through the sliding block, the detection probe is prevented from being directly contacted with the inner wall of the sliding hole, and abrasion of the detection probe is avoided.
The utility model discloses further set up to: the through-hole that supplies test probe to pass is seted up to the sliding block, the sliding block is provided with solid fixed ring in through-hole department, gu fixed ring center and through-hole center are in a straight line, test probe runs through in solid fixed ring and through-hole, gu fixed ring is provided with and is used for keeping test probe and the fixed mounting of sliding block relative position.
Through adopting above-mentioned technical scheme, be convenient for realize the dismantlement of test probe and sliding block and be connected to be convenient for change test probe.
The utility model discloses further set up to: the mounting is fixing bolt, fixing bolt's tip extends to solid fixed ring's inside, fixing bolt's tip butt in test probe's outer wall, fixing bolt and solid fixed ring threaded connection.
Through adopting above-mentioned technical scheme, through the tight test probe in fixing bolt top, avoid test probe in solid fixed ring inside circumferential direction.
The utility model discloses further set up to: the mounting is two, and two mountings use the stationary ring axis to set up as central symmetry.
By adopting the technical scheme, the stability of the detection probe is improved, and the synchronous motion of the detection probe and the sliding block is convenient to realize.
The utility model discloses further set up to: the driving assembly comprises a bidirectional screw rod which is rotatably arranged in a sliding hole, the axis of the bidirectional screw rod and the axis of the sliding hole are arranged in parallel, two sliding blocks are provided with threaded holes matched with the bidirectional screw rod, the thread turning directions of the two threaded holes are opposite, the transverse plate of each sliding block is provided with a driving piece for driving the bidirectional screw rod to rotate, and a limiting rod for preventing the sliding blocks from circumferentially rotating along the axis of the bidirectional screw rod is further arranged in the sliding hole.
Through adopting above-mentioned technical scheme, rotate through the two-way lead screw of driving piece control, because two-way lead screw and sliding block threaded connection rotate the in-process of two-way lead screw, the sliding block can move along the axis direction of two-way lead screw to realize being close to each other or keeping away from of two sliding blocks, thereby realize the distance between two sliding blocks and adjust.
The utility model discloses further set up to: the sliding block is provided with a limiting hole matched with the limiting rod.
Through adopting above-mentioned technical scheme, the gag lever post is worn to locate spacing downthehole, not only can prevent the sliding block along two-way screw rod axis direction circumferential direction, can strengthen the stability of sliding block along two-way screw rod axis direction displacement in-process moreover.
The utility model discloses further set up to: the diaphragm upper surface has seted up the groove of stepping down corresponding the driving piece, the one end of two-way lead screw extends to the inside in groove of stepping down along its axis direction, is located the two-way lead screw and the driving piece fixed connection of inslot portion of stepping down.
Through adopting above-mentioned technical scheme, be convenient for realize the installation to the driving piece of being convenient for control two-way lead screw rotates.
The utility model discloses further set up to: be provided with the extensible member that is used for driving the diaphragm to remove along supporting leg length direction between base and the diaphragm, the one end and diaphragm fixed connection, the other end and the base fixed connection of extensible member.
Through adopting above-mentioned technical scheme, through the length of adjusting the extensible member, the extensible member drives the diaphragm and removes along the vertical length direction of supporting leg to the realization is to the regulation of distance between diaphragm and the road surface.
The utility model discloses further set up to: and the upper surface of the base is provided with a clamping assembly for clamping the detector.
By adopting the technical scheme, on one hand, the detachable connection between the detector and the base is convenient to realize, and the storage and collection of the detector are convenient to realize after the measurement is finished; on the other hand, the stability of connection between the detector and the base is improved.
To sum up, the utility model discloses following beneficial effect has:
firstly, the distance between two detection probes is adjusted through a driving assembly to be matched with roads with different widths, and the distance between the two detection probes is adjustable, so that one detector can detect the roads with different widths;
secondly, the detection probe is in sliding connection with the sliding hole through the sliding block, so that the detection probe is prevented from directly contacting with the inner wall of the sliding hole, the detection probe is prevented from being worn, and the service life of the detection probe is prolonged;
and thirdly, the detector is conveniently stored and collected after the measurement is finished through the detachable connection between the detector and the base, and the detector is conveniently maintained regularly.
Drawings
FIG. 1 is a schematic view of the overall structure of a road crack detecting apparatus;
FIG. 2 is a schematic view showing the connection relationship among a display base, an electric wire, a detection probe and a transverse plate of the road crack detection device;
FIG. 3 is an enlarged view of portion A of FIG. 1;
fig. 4 is an enlarged view of a portion B in fig. 1.
In the figure, 1, a base; 2. a detector; 3. detecting a probe; 4. an electric wire; 5. supporting legs; 51. a vertical chute; 6. a roller; 7. a transverse plate; 71. a sliding hole; 72. a yielding groove; 8. a clamping assembly; 81. a clamp arm; 82. a rotating shaft; 83. a torsion spring; 9. a mounting cavity; 10. a rotating seat; 20. a stopper; 201. a straight surface; 202. a bevel; 30. a sliding block; 301. a through hole; 302. a threaded hole; 303. a limiting hole; 40. a fixing ring; 50. fixing the bolt; 60. a drive assembly; 601. a bidirectional screw rod; 602. a limiting rod; 603. a motor; 70. a cylinder; 701. a piston rod; 702. a cylinder barrel; 80. and a T-shaped block.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Combine fig. 1 and fig. 2, do the utility model discloses a road crack check out test set, base 1 including the level setting, four supporting legs 5 are installed to base 1's lower fixed surface, and four supporting legs 5 are rectangular array in base 1's lower surface and distribute, and gyro wheel 6 is all installed to one side that base 1 was kept away from to every supporting leg 5.
The detector 2 for detecting the road crack is installed at the center of the upper surface of the base 1, the two detection probes 3 are arranged below the base 1, and the two detection probes 3 are electrically connected with the detector 2 through electric wires 4 respectively. The detector 2 emits vibration energy to the road pavement through the detection probe 3, the vibration energy generates diffraction at the crack end point, the diffraction angle and the crack depth have a geometric relation, and the crack depth value and the received wave are displayed on the same screen.
With reference to fig. 2 and 3, a horizontal plate 7 is disposed below the base 1, the horizontal plate 7 is parallel to the base 1, and two sides of the horizontal plate 7 are slidably connected to the corresponding support legs 5.
With reference to fig. 1 and 4, two sides of the horizontal plate 7 are slidably connected to the corresponding support legs 5, a telescopic member for adjusting a distance between the horizontal plate 7 and the base 1 is disposed between the horizontal plate 7 and the base 1, the telescopic member is a cylinder 70, a piston rod 701 of the cylinder 70 is fixedly connected to an upper surface edge of the horizontal plate 7, and a cylinder barrel 702 of the cylinder 70 is fixedly connected to a lower surface of the base 1.
Referring to fig. 1 and 2, a wire hole through which a power supply wire 4 passes is formed at a superposition position of the base 1 and the detector 2, and one end of the power supply wire 4, which is far away from the detector 2, penetrates through the wire hole and then is connected with the detection probe 3.
With reference to fig. 1 and 4, the horizontal plate 7 has been seted up along its horizontal length direction and has been slided hole 71, and slide hole 71 is the bar setting, and the one end that the test probe 3 is located slide hole 71 inside is through sliding block 30 and slide hole 71 sliding connection, avoids the direct and 71 inner wall contact in slide hole of test probe 3, avoids the wear and tear of test probe 3. The detecting probes 3 and the sliding blocks 30 move synchronously, and the number of the sliding blocks 30 corresponds to the number of the detecting probes 3 one by one.
Referring to fig. 4, a through hole 301 for the detection probe 3 to pass through is formed in the center of the sliding block 30, a fixing ring 40 is fixedly arranged on the upper surface of the sliding block 30 corresponding to the through hole 301, the center of the fixing ring 40 and the center of the through hole 301 are located on the same straight line, one end, far away from the detector 2, of the detection probe 3 sequentially penetrates through the fixing ring 40 and the through hole 301, the fixing ring 40 is provided with two fixing pieces for fixing the relative positions of the detection probe 3 and the sliding block 30, and the two fixing pieces are symmetrically arranged by taking the axis of the fixing ring 40 as the center. The mounting is fixing bolt 50, and fixing piece and solid fixed ring 40 threaded connection, fixing bolt 50's tip extend to solid fixed ring 40's inside, and fixing bolt 50 butt is located the outer wall of solid fixed ring 40 inside detecting probe 3, improves detecting probe 3's stability, is convenient for realize detecting probe 3 and sliding block 30 simultaneous movement.
The transverse plate 7 is provided with a driving assembly 60 for driving the two sliding blocks 30 to approach or depart from each other, and the driving assembly 60 comprises a bidirectional screw rod 601, a limiting rod 602 and a driving piece for driving the bidirectional screw rod 601 to rotate.
The bidirectional screw rod 601 and the limiting rod 602 are arranged inside the sliding hole 71, and the bidirectional screw rod 601 and the limiting rod 602 are arranged in parallel at intervals. The side of the upper surface of the transverse plate 7 corresponding to the bidirectional screw rod 601 is provided with a yielding groove 72, the yielding groove 72 is communicated with the sliding hole 71, the driving part is a motor 603, the motor 603 is fixedly arranged in the yielding groove 72, and the output ends of the bidirectional screw rod 601 and the motor 603 rotate coaxially.
With reference to fig. 1 and 4, the two sliding blocks 30 are provided with threaded holes 302 adapted to the two-way screw rod 601, the thread turning directions of the two threaded holes 302 are opposite, one end of the two-way screw rod 601, which is far away from the motor 603, sequentially penetrates through the two sliding blocks 30 and is rotationally connected with the inner wall of the sliding hole 71, and when the two-way screw rod 601 is rotated, the two sliding blocks 30 can be close to or far away from each other along the length direction of the sliding hole 71.
Two sliding blocks 30 still offer the spacing hole 303 with gag lever post 602 looks adaptation, the one end and the hole 71 inner wall fixed connection that slides of gag lever post 602, the other end run through in order behind two spacing holes 303 and the hole 71 that slides opposite side inner wall fixed connection that slides. According to the difference of the road width, the two detection probes 3 can move along the horizontal length direction of the transverse plate 7, so that the distance between the two detection probes 3 can be adjusted
Referring to fig. 1 and 3, a clamping assembly 8 for clamping the detector 2 is disposed on the upper surface of the base 1. The clamping assemblies 8 are two groups, and the clamping directions of the two groups of clamping assemblies 8 are arranged in a crossed manner. Every group's clamping components 8 all includes the centre gripping arm 81 of two relative settings, encloses into the installation cavity 9 that is used for placing detector 2 between two centre gripping arms 81, and two centre gripping arms 81 set up respectively in the both sides of detector 2. The two clamping arms 81 are rotatably connected with the base 1 through a rotating shaft 82, a torsion spring 83 used for keeping the clamping state of the clamping arms 81 on the detector 2 is sleeved on the rotating shaft 82, and one torsion arm of the torsion spring 83 is fixedly connected with the base 1, and the other torsion arm is fixedly connected with the clamping arms 81.
The upper surface welding of base 1 has and rotates seat 10, and every centre gripping arm 81 corresponds there are two to rotate seat 10, and two rotate seat 10 and set up respectively in the both sides of centre gripping arm 81, and the one end of pivot 82 and one of them rotate seat 10 and rotate the connection, the other end runs through behind centre gripping arm 81 and rotate seat 10 and rotate the connection with another, and pivot 82 is in its junction fixed connection with centre gripping arm 81.
One side that centre gripping arm 81 kept away from base 1 sets firmly the dog 20 that prevents that detector 2 from deviating from installation cavity 9, and the cross-section of dog 20 is right triangle and sets up, and dog 20 sets up to straight face 201 towards one side of base 1, and the up end of dog 20 sets up to inclined plane 202, and inclined plane 202 and straight face 201 set up relatively, when detector 2 placed inside installation cavity 9, straight face 201 butt in the upper surface of detector 2.
The implementation principle of the embodiment is as follows: when needs use the utility model discloses when examining the road crack, install the top to base 1 from last earlier detector 2, under the effect of centre gripping subassembly 8, realize detector 2 and base 1's fixed connection, then along supporting leg 5's vertical length direction to the one side removal diaphragm 7 that is close to the road surface, diaphragm 7 drives test probe 3 and moves down in step, when test probe 3 moves to waiting to detect the position, open detector 2, detector 2 passes through test probe 3 to road surface transmission vibration energy, vibration energy produces the diffraction at the crack extreme point, the diffraction angle has the geometric relation with the crack depth, crack depth value and received wave are with the screen display when using detector 2, thereby realize fissured detection.
When the road with different widths needs to be detected, the motor 603 is started, the motor 603 drives the bidirectional screw rod 601 to rotate, the bidirectional screw rod 601 is in threaded connection with the sliding block 30, in the process of rotating the bidirectional screw rod 601, the sliding block 30 can move along the axis direction of the bidirectional screw rod 601, and the two sliding blocks 30 are close to or far away from each other due to opposite thread turning directions of the two sliding blocks 30 in threaded connection with the bidirectional screw rod 601, so that the distance between the two detection probes 3 is matched with the road with different widths, and the distance between the two detection probes 3 is adjustable, so that the detection of the road with different widths by the detector 2 is realized.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (10)
1. The road crack detection equipment comprises a horizontally arranged base (1), wherein a detector (2) is arranged on the upper surface of the base (1), four supporting legs (5) are arranged on the lower surface of the base (1), and the four supporting legs (5) are distributed in a rectangular array, and the road crack detection equipment is characterized in that a transverse plate (7) is arranged between every two adjacent supporting legs (5), the transverse plate (7) and the base (1) are arranged in parallel, and the transverse plate (7) is connected with the supporting legs (5) in a sliding manner; be provided with two detecting probe (3) on diaphragm (7), diaphragm (7) are provided with and are used for driving two sliding block (30) and are close to each other or drive assembly (60) of keeping away from each other, two detecting probe (3) and detector (2) are connected through electric wire (4) electricity.
2. The road crack detection device according to claim 1, wherein the transverse plate (7) is provided with a sliding hole (71) along the horizontal length direction thereof, a sliding block (30) is arranged inside the sliding hole (71), the sliding block (30) is connected with the sliding hole (71) in a sliding manner, and the detection probe (3) and the sliding block (30) move synchronously.
3. The road crack detection device according to claim 2, wherein the sliding block (30) is provided with a through hole (301) for the detection probe (3) to pass through, the sliding block (30) is provided with a fixing ring (40) at the through hole (301), the center of the fixing ring (40) and the center of the through hole (301) are located on the same straight line, the detection probe (3) penetrates through the fixing ring (40) and the through hole (301), and the fixing ring (40) is provided with a fixing member for fixing the relative positions of the detection probe (3) and the sliding block (30).
4. A road crack detecting device according to claim 3, characterized in that the fixing member is a fixing bolt (50), the end of the fixing bolt (50) extends to the inside of the fixing ring (40), the end of the fixing bolt (50) abuts against the outer wall of the detecting probe (3), and the fixing bolt (50) and the fixing ring (40) are connected by screw threads.
5. A road crack detecting device as claimed in claim 3, characterized in that the number of the fixing members is two, and the two fixing members are symmetrically arranged with respect to the axis of the fixing ring (40).
6. The road crack detection device according to claim 1, wherein the driving assembly (60) comprises a bidirectional screw rod (601) rotatably disposed inside a sliding hole (71), the axis of the bidirectional screw rod (601) and the axis of the sliding hole (71) are arranged in parallel, two sliding blocks (30) are both provided with threaded holes (302) adapted to the bidirectional screw rod (601), the threaded directions of the two threaded holes (302) are opposite, the transverse plate (7) of the sliding block (30) is provided with a driving piece for driving the bidirectional screw rod (601) to rotate, and a limiting rod (602) for preventing the sliding block (30) from rotating circumferentially along the axis of the bidirectional screw rod (601) is further disposed inside the sliding hole (71).
7. The road crack detection device of claim 6, wherein the sliding block (30) is provided with a limiting hole (303) matched with the limiting rod (602).
8. The road crack detection device of claim 6, characterized in that, the driving piece is provided with a yielding groove (72) on the upper surface of the transverse plate (7), one end of the bidirectional screw rod (601) extends to the inside of the yielding groove (72) along the axial direction thereof, and the bidirectional screw rod (601) located inside the yielding groove (72) is fixedly connected with the driving piece.
9. The road crack detection device of claim 1, characterized in that a telescopic part for driving the transverse plate (7) to move along the length direction of the support leg (5) is arranged between the base (1) and the transverse plate (7), one end of the telescopic part is fixedly connected with the transverse plate (7), and the other end of the telescopic part is fixedly connected with the base (1).
10. A road crack detecting device according to claim 1, characterized in that the upper surface of the base (1) is provided with a clamping assembly (8) for clamping the detector (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021160801.1U CN212274890U (en) | 2020-06-20 | 2020-06-20 | Road crack detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021160801.1U CN212274890U (en) | 2020-06-20 | 2020-06-20 | Road crack detection equipment |
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| Publication Number | Publication Date |
|---|---|
| CN212274890U true CN212274890U (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021160801.1U Expired - Fee Related CN212274890U (en) | 2020-06-20 | 2020-06-20 | Road crack detection equipment |
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| CN (1) | CN212274890U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532310A (en) * | 2021-07-08 | 2021-10-22 | 四川督信工程试验检测有限责任公司 | Pavement structure depth measuring instrument and structure depth detection method |
-
2020
- 2020-06-20 CN CN202021160801.1U patent/CN212274890U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532310A (en) * | 2021-07-08 | 2021-10-22 | 四川督信工程试验检测有限责任公司 | Pavement structure depth measuring instrument and structure depth detection method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |