CN2337195Y - Helical rimer type dredging apparatus - Google Patents
Helical rimer type dredging apparatus Download PDFInfo
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- CN2337195Y CN2337195Y CN 98224262 CN98224262U CN2337195Y CN 2337195 Y CN2337195 Y CN 2337195Y CN 98224262 CN98224262 CN 98224262 CN 98224262 U CN98224262 U CN 98224262U CN 2337195 Y CN2337195 Y CN 2337195Y
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- pump impeller
- output shaft
- bearing
- conveyer
- turbine
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Abstract
The utility model relates to a helical rimer type dredging apparatus, which comprises a motor, a reducer casing, a spiral rimer and a spiral conveyer. The conveyer is composed of a machine base, a spiral impeller assembly formed by that multiple nodal axes are mutually connected and a cylindrical casing surrounding the assembly. In addition, the cylindrical casing is arranged on the machine base. Furthermore, a shaft coupling is used for causing the spiral impeller assembly and the spiral rimer to be fixedly connected. The apparatus also comprises a distance-limiting coupler arranged between the motor and a reducer and a lifting apparatus. Therefore, the apparatus is characterized in compact structure, light weight and high safety, and the utility model is suitable for the dredging of rivers, lakes and sea approaches which are characterized in narrow water channel, complex water riverbed and shallower water level. In addition, the utility model can also prevent the generation of secondary pollution of dredged muck to water.
Description
The utility model relates to a kind of dredger, more particularly, is relevant a kind of spiral reamer type dredger that river course mud is cut out with screw reamer.
Because of natural or artificial reason, on the end in rivers, lake and coastal waters, deposit a lot of mud, for purify water, renovating environment and dredging channel, people adopt some so-called dredging machinery to clear up usually.Existing dredging machinery has grab claw, scraper bowl machine, slusher machine and reamer excavator etc., and wherein, grab claw, scraper bowl machine, slusher machine belong to the bigger equipment of deadweight, need be loaded on the darker ship of drinking water, are subjected to bigger restriction on the scope of application.When constructing, although they can be more effectively with mud under water, even deep layer mud has been excavated, but because its bucket capacity is long-pending and from great relation, the operation impact force is also big, can be installed in equipment on the ship and operation area nearby or embankment on every side cause very big damage or destructive power; The operation of reamer excavator is to cut with scissors loose mud with its anterior reamer, auxiliaryly subsequently will cut with scissors loose sludge pump with slush pump and be extracted on the ship or on the bank.Like this, impact force reduces during the work of reamer excavator, and but, the rotation meeting of reamer sometimes is stuck and cause motor to damage by mud institute, again, then tends to cause the secondary pollution of the water surface during with the slush pump sucking sludge.In addition, these dredging machineries all exist complex structure, invest big problem more than.
The purpose of this utility model is to provide a kind of with the deep moving mud of hinge and directly be transported to this mud on the ship's deck or on the bank spiral reamer type dredger through conveyer under water of screw reamer for the deficiency that solves above-mentioned dredging machinery.
For realizing above purpose, spiral reamer type dredger of the present utility model comprises motor, reduction box, screw reamer, wherein, also comprise a conveyer, described conveyer is surrounded the screw impeller assembly and is installed in the conveying worm that the cylindrical chassis on the support constitutes by the screw impeller assembly and that axle links to each other by a support, some joints or section, and can utilize shaft coupling that screw impeller assembly and screw reamer are connected
Spiral reamer type dredger as previously discussed, wherein, it comprises that also one is installed in distance-limiting type coupling device between motor and the reducer by shaft coupling, this distance-limiting type coupling device contains:
One output shaft, this output shaft are the multidiameter that step is arranged;
One pump impeller, this pump impeller comprises a discoid body and some blades, wherein, discoid body contains one and is positioned at the annular groove portion that periphery, cross section are bowl-type, one is positioned at outer bulge loop, that anterior internal projecting ring, is positioned at the rear portion is positioned at annular nib on the periphery periphery, and blade is installed in the annular groove portion in the mode of radial equipartition;
One rotation case, this rotation case heart therein have an axis hole, and its periphery is provided with an annular nib, and an overload protection hole is arranged at its top;
One turbine, this turbine comprise a discoid body and some blades, and wherein, discoid body contains one and is positioned at the axis hole that annular groove portion and that periphery, cross section be bowl-type is positioned at its center, and blade is installed in the annular groove portion in the mode of radial equipartition;
One ancillary chamber housing, this ancillary chamber housing is plate-like, and its periphery has an annular nib and top to be provided with a fuel feed hole;
Described pump impeller is rotatably supported on the end of output shaft by the clutch shaft bearing that is installed on the internal projecting ring, described rotation case is by being installed in the rear portion that second bearing in the axis hole is rotatably supported in output shaft, the annular nib of its annular nib and pump impeller is tightly connected, and between the output shaft outside second bearing and the shaft hole inner wall of rotation case sealing mechanism is housed, on the overload protection hole of rotation case, Yi Rongsai is housed; The annular web of described ancillary chamber housing and the outer bulge loop of pump impeller are tightly connected, and the axis hole of described turbine by the center is packed on the output shaft between pump impeller and the rotation case and to make its cross section be the annular groove portion opening of bowl-type relative with the annular groove portion opening that the cross section of pump impeller is bowl-type.Be provided with an aperture between described pump impeller discoid body and the internal projecting ring.In addition, be full of liquid between pump impeller and rotation case and between pump impeller and ancillary chamber housing, this liquid is mainly oil; This distance-limiting type coupling device can be made pump impeller and rotation case rotate together by driven by motor, and the rotation of pump impeller is simultaneously also stirred oil, so the oil that flows promotes to be fixed in the turbine rotation on the output shaft.When this distance-limiting type coupling device advances operation process to be subjected to that resistance surpasses predetermined value and when transshipping at screw reamer, can be by being installed in the thawing of the Yi Rongsai on the overload protection hole, the outflow of oil between housing and make the turbine stall, thereby protection motor.Usually easily melt plug for easily melting metal or 0 compound that metallizes is made.
Spiral reamer type dredger as previously discussed, wherein, described screw reamer is made by high-wearing feature manganese steel, and as 6SiMnW, the hardness after the quenching is HRc 〉=57.
Spiral reamer type dredger as previously discussed, wherein, the impeller of described conveyer and the radial spacing of cylindrical chassis are 2-8mm, pitch is 200-300mm.
Spiral reamer type dredger as previously discussed, wherein, the impeller diameter of described conveyer is 140-240mm,
Spiral reamer type dredger as previously discussed, wherein, described reducer is the cycloidal-pin wheel reducer, speed reducing ratio is 1: 20-30.
Spiral reamer type dredger as previously discussed, wherein, the bearing of described conveyer adopts black synthesis type (Composite) bearing of the Huang of Baolong (Thordon).
Spiral reamer type dredger as previously discussed, wherein, described conveyer is less than 90 degree around the angle of the bearing hole rotation of bearing.
Spiral reamer type dredger as previously discussed, wherein, the blade of described pump impeller is more than 20, turbine blade be more than 22.
Spiral reamer type dredger as previously discussed, wherein, the blade of described pump impeller bowl-type is than the blade 2-5 of the manying sheet of the bowl-type of turbine.
In addition, described conveying worm is provided with a rest pad with holes in the support bottom; Suspension ring are equipped with in the front position in the top of described casing, described spiral reamer type dredger also comprises a lifting gear, this lifting gear comprises a base, one wire rope, one is installed in the portal frame on the base, the a pair of bearing that is installed on the preceding base of portal frame and is with bearing hole, one is installed in the wheel shaft and a pair of pulley on portal frame top, these pulleys are installed in rotation on the wheel shaft, described conveying worm can be installed on the bearing of lifting gear rotationally by the rest pad on the support, one of described wire rope is connected with suspension ring, and the other end is walked around pulley and is connected to hoist engine.
Because in of the present utility model; conveying worm and screw reamer directly link into an integrated entity; conveying worm is that some screw impeller assemblies are formed; its length can change according to the dredging riverbed depth; screw reamer top is provided with one and is connected with the conveyer cylindrical chassis; thereby; but the part of this caisson housing screw reamer or big portion; conveyer and screw reamer etc. can be by pulley type lifting gear carrying location; and have by pump impeller; turbine; compositions such as overload protection arrangement; can realize the distance-limiting type coupling device of overload protection; for this reason; whole dredger has compact conformation; in light weight; safe and reliable, be applicable to water channel narrow; riverbed, waters complexity; the rivers that water level is more shallow; the dredging of institute's settled sludge in lake and the coastal waters, and can prevent that the mud of being dredged from producing secondary pollution to the waters.
Fig. 1 is the structural representation of the spiral reamer type dredger of first embodiment of the present utility model;
Fig. 2 is the structural representation of the spiral reamer type dredger of second embodiment of the present utility model;
Fig. 3 is the sectional view of the distance-limiting type coupling device among a Fig. 2;
Fig. 4 represents the pump impeller of distance-limiting type coupling device, the flow regime figure of turbine fluid when work;
The baffle plate that Fig. 5 a, 5b, 5c represent the distance-limiting type coupling device under different operating modes to the action diagram of the circulation of fluid;
Fig. 6 is the enlarged drawing of the part of the A among a Fig. 3;
Fig. 7 is the structure partial cross-sectional schematic of the spiral reamer type dredger of the 3rd embodiment of the present utility model.
See also Fig. 1, in first embodiment of the present utility model, spiral reamer type dredger mainly comprises, one motor 1, a reduction box 4, a conveyer 5, screw reamer 6 and a caisson 7, wherein, motor 1 is the power source of this dredger, for volume is reduced, generally select high-speed motor for use, again according to the size of dredging depth, soil property situation and dredging amount, so can adopt 20-50kw or motor more powerful, 1500 rev/mins.In addition, consider that this device works in the open, the reply motor is taked certain moisture preventive measure.
Conveyer 5 is a kind of conveying worm, the screw impeller assembly of being made up of axle 12 and helical runner 13 support 11, some joints or section, one surrounds the setting of screw impeller assembly and the cylindrical casing 15 that is installed on the support 11 by leg 14 constitutes, between the screw impeller assembly, be connected to each other, and this intermediate bearing 16 is by bearing spider 17 location of being fixed on the cylindrical casing 15 of supporting by intermediate bearing 16.
In order successfully to carry out the conveying of material or mud, helical runner 13 peripheries of described conveyer and the radial clearance of cylindrical casing inwall distance are about 2-8mm, and impeller diameter is 140-240mm, and pitch is 200-300mm.
Caisson 7 is the cover body of a semicircle or lid shape, is connected with the top of the entrance point of cylindrical casing 15, makes it be positioned at the top of screw reamer 6 and reamer 19 tops are included in the cover cap form.Caisson 7 also can be offered water conservancy diversion aperture (not drawing among the figure) in the one side, utilizes water-head that mud is pushed the import of conveying worm, can reduce the secondary pollution in waters to greatest extent.
See also Fig. 2-4, spiral reamer type dredger for second embodiment of the present utility model, wherein, the above motor 1, reduction box 4, conveyer 5, screw reamer 6, caisson 7 structures are constant, just, comprise that also one is installed in distance-limiting type coupling device 3 between motor 1 and the reducer 4 by flange 43 and shaft coupling 44, this distance-limiting type coupling device contains:
One output shaft 31, this output shaft are the multidiameter that contains shoulder 310 and step;
One pump impeller 32, this pump impeller comprises a discoid body and some blades 321, wherein, discoid body contains an annular groove portion 325 that is positioned at periphery, the cross section semicircular in shape or the bowl-type of this annular groove portion, one is positioned at the front portion, promptly with the 325 opening equidirectional settings of annular groove portion and be positioned at the internal projecting ring 324 of middle position, one is positioned at the outer bulge loop 322 on the annular groove portion rear portion, one is positioned at the annular nib 320 on the periphery periphery, outside internal projecting ring 324, be provided with an aperture 323 between the bulge loop 322 on the wall, blade 321 is generally more than 20 and is identical with the cross section of annular groove portion 325, mode with radial equipartition is installed in the annular groove portion, and described pump impeller 32 is rotatably supported on the end of output shaft 31 by the clutch shaft bearing 37 that is installed on the internal projecting ring 324;
One rotation case 33, this rotation case is spherical cap shape, and the heart is provided with an axis hole 331 therein, and its periphery is provided with an annular nib 330, and its top is provided with an overload protection hole 332; Described rotation case 33 is by being installed in the rear portion that second bearing 38 in the axis hole 331 is rotatably supported in output shaft 31, and its annular nib 330 is tightly connected with the annular nib 324 of pump impeller and between the shaft hole inner wall of the output shaft 31 in second bearing, 38 outsides and rotation case 33 sealing mechanism 39 (other end of output shaft 31 is connected to the shaft coupling 44 that links to each other with reduction box 4) is housed;
One turbine 34, this turbine comprises a discoid body and some blades 341, wherein, discoid body contains an annular groove portion 345 that is positioned at periphery, the cross section semicircular in shape of this annular groove portion or bowl-type and are positioned at the axis hole 340 at its center, blade 341 generally has more than 22 and is identical with the cross section of annular groove portion 345, mode with radial equipartition is installed in the annular groove portion, the axis hole 340 of described turbine by the center is installed on the output shaft 31 between pump impeller 32 and the rotation case 33 and is fixing by screw and output shaft shoulder 310, and makes its bowlshaped mouth relative with the bowlshaped mouth of pump impeller.
Generally, by the distance-limiting type coupling device circulation diameter that pump impeller 32, turbine 34 or rotation case 33 constitute, promptly the dimension series of coupling device is: 280,320,360,400,450,500,560,630 (mm) etc.
One ancillary chamber housing 35, this ancillary chamber housing is plate-like, and its periphery has an annular nib 350, and its disk body sidewall is provided with a fuel feed hole 351, and there is a centre bore in its central authorities, and that this centre bore is installed is one that be tightly connected, the installation cover 352 of tool locating hole; Described ancillary chamber housing 35 is connected with outer bulge loop 322 end face seals of pump impeller by annular nib 350, and is connected with flange 43 on being contained in motor shaft by the locating hole on the installation cover 352;
Again, according to the following design principle that will illustrate, usually the blade 321 than pump impeller is big slightly for the blade 341 of turbine 34, and a breach 46 is arranged at the bottom of the blade 341 of turbine 34, in addition, the distance-limiting type coupling device also is provided with a baffle plate 36, and this baffle plate is an annular, is sleeved on the output shaft and is connected with the side shoulder of output shaft or turbine axis hole 340.
In addition, distance-limiting type coupling device 3 comprises that also a plug cock 40 and easily melts plug 41, and plug cock 40 is tightly connected with ancillary chamber housing fuel feed hole 351, easily melts 41 of plugs and is installed on the rotation case overload protection hole 332.The distance-limiting type coupling device can be by the space that fuel feed hole 351 pours into the space of 35 of pump impeller 32 and ancillary chamber housings with oil and a set aperture 323 flows into 33 of pump impellers 32 and rotation cases on the pump impeller wall, and makes these spaces be full of fluid.
From above structure as seen; distance-limiting type coupling device 3 can be rotated together by motor 1 drive pump impeller 32 and rotation case 33; the rotation of pump impeller is simultaneously also stirred wherein contained oil; and make the arrow direction of oil with black; so the turbine 34 that the oil that flows is fixed on the output shaft 31 with the direction of arrow promotion of white rotates; as shown in Figure 4; drive conveyers 5 and screw reamer 6 rotates together by output shaft 31 through elastic coupling 44 and reduction box 4 subsequently; carry out operation; and the resistance that is subjected in screw reamer operation progradation surpasses predetermined value; when promptly overload occurring; can make oily temperature rise, as reach easily the melting plug 41 that is installed on the overload protection hole 332 is melted, oil overflows from the hole; make the turbine stall, thereby the protection motor exempts from damage.
In order to make oil flow to turbine 34 well from pump impeller 32, the baffle plate 36 that set breach 46 and indentation, there are installed under the turbine provide this may.Under normal operating mode, circulation does not touch baffle plate 36, so baffle plate do not influence 3 work of distance-limiting type coupling device, shown in Fig. 5 a; When the speed ratio that rotates reduces, circulation is reduced to a certain degree along turbine 34 inwall extension values, as do not have baffle plate circulation and change its course, become systemic circulation by partial circulating, because of making circulation turn back from turbine 34 inner edges, the guide effect of baffle plate leaves turbine, shown in Fig. 5 b than long radius R2; Because the outlet radius r of turbine 34
2More unbaffled wanting can remain the torque feedback greatly, therefore reduced the deformity of characteristic, shown in Fig. 5 c.
As shown in Figure 6, sealing mechanism 39 comprise one be set on the output shaft 31 and be fixed on cover plate 60 on the rotation case 33, in the retainer ring 61, its endoporus of cover plate is fixed in cover plate 60 inboards, contain annular groove, inboard and can be installed in O type ring 63 and in the annular groove of retainer ring 61 relative to the compensated loop 62, that output shaft 31 moves and be installed in holddown spring 64 between second bearing 38 and the compensated loop 62 at retainer ring 61, for this reason, sealing mechanism 39 provides the rotatory sealing of output shaft 31.
See also shown in Figure 7, spiral reamer type dredger for the 3rd embodiment of the present utility model, wherein, the above motor 1, distance-limiting type coupling device 3, reduction box 4, conveyer 5, screw reamer 6, caisson 7 structures are constant, just conveyer 5 is provided with a rest pad 25 with holes in the bottom of support 11, and two suspension ring spares 26 are equipped with in the front position in the top of casing 15; Also comprise a lifting gear 8, this lifting gear comprises a base 50, two wire rope 51, one hoist engine, one is installed in the portal frame 52 on the base, the a pair of bearing 53 that is installed in the band bearing hole on the preceding base 50 of portal frame, one is installed in the wheel shaft 55 and a pair of pulley 54 on portal frame top, this pulley 54 is installed in rotation on the wheel shaft 55, described conveying worm 5 can pivotally be connected (installation) with rest pad 25 on the conveyer support by fulcrum 56, one of described wire rope 51 each is connected with one of suspension ring spare 26, the other end is walked around pulley 54 and is connected to this lifting gear 8 of hoist engine (not drawing among the figure) and is installed on the platform of ship by base 50, conveying worm 5 can be promoted during hoist engine work, and fulcrum 56 pivoted that are connected with rest pad 25 around bearing 53, rotational angle is α, and α is generally less than 180 degree.Like this, conveying worm 5 can be in work under the certain angle, particularly can control its working depth under water.
Claims (10)
1, a kind of spiral reamer type dredger, comprise motor, reduction box, screw reamer, it is characterized in that: also comprise a conveyer, described conveyer is surrounded the screw impeller assembly and is installed in the conveying worm that the cylindrical chassis on the support constitutes by the screw impeller assembly and that axle links to each other, and utilized shaft coupling that screw impeller assembly and screw reamer are connected by a support, some joints.
2, dredger according to claim 1 is characterized in that: it comprises that also one is installed in distance-limiting type coupling device between motor and the reducer by shaft coupling, and this distance-limiting type coupling device contains:
One output shaft, this output shaft are the multidiameter that step is arranged;
One pump impeller, this pump impeller comprises a discoid body and some blades, wherein, discoid body contains one and is positioned at the annular groove portion that periphery, cross section are bowl-type, one is positioned at outer bulge loop, that anterior internal projecting ring, is positioned at the rear portion is positioned at annular nib on the periphery periphery, and blade is installed in the annular groove portion in the mode of radial equipartition;
One rotation case, this rotation case heart therein have an axis hole, have one on its periphery, and an overload protection hole is arranged at its top;
One turbine, this turbine comprise a discoid body and some blades, and wherein, discoid body contains one and is positioned at the axis hole that annular groove portion and that periphery, cross section be bowl-type is positioned at its center, and blade is installed in the annular groove portion in the mode of radial equipartition;
One ancillary chamber housing, this ancillary chamber housing is plate-like, and its periphery has an annular nib and top to be provided with a fuel feed hole;
Described pump impeller is rotatably supported on the end of output shaft by the clutch shaft bearing that is installed on the internal projecting ring, described rotation case is by being installed in the rear portion that second bearing in the axis hole is rotatably supported in output shaft, the annular nib of its annular nib and pump impeller is tightly connected and between the shaft hole inner wall of the output shaft in second bearing outside and rotation case sealing mechanism is housed, the annular web of described ancillary chamber housing and the outer bulge loop of pump impeller are tightly connected, the axis hole of described turbine by the center is packed on the output shaft between pump impeller and the rotation case and to make its cross section be the annular groove portion opening of bowl-type relative with the annular groove portion opening that the cross section of pump impeller is bowl-type, in addition, be full of liquid between pump impeller and rotation case and between pump impeller and ancillary chamber housing, this liquid is mainly oil.
3, dredger according to claim 1 is characterized in that: described screw reamer is 6SiMnW for high-wearing feature manganese steel.
4, dredger according to claim 1 is characterized in that: the impeller of described conveyer and the radial spacing of cylindrical chassis are 2-8mm, and impeller diameter is 140-240mm, and pitch is 200-300mm.
5, dredger according to claim 1 is characterized in that: the blade of described pump impeller is more than 20, and the blade of turbine is more than 22.
6, dredger according to claim 1 is characterized in that: described reducer is the cycloidal-pin wheel reducer, and speed reducing ratio is 1: 20-30.
7, dredger according to claim 1 is characterized in that: described screw reamer linear velocity is: the 2-5 meter per second.
8, dredger according to claim 1 is characterized in that: the bearing of conveyer adopts the black synthesis type bearing of the Huang of Baolong.
9, dredger according to claim 1 is characterized in that: a breach is arranged at the bottom of each blade of turbine, and the distance-limiting type coupling device also can be provided with a baffle plate, and this baffle plate is annular, is sleeved on the output shaft and and output shaft fixed connection.
10, dredger according to claim 1 is characterized in that:
Described conveyer is provided with a rest pad with holes in the bottom of support, two suspension ring spares are equipped with in the front position in the top of casing; In addition, also comprise a lifting gear, this lifting gear comprises a base, two wire rope, one hoist engine, one is installed in the portal frame on the base, the a pair of bearing that is installed in the band bearing hole on the preceding base of portal frame, one is installed in the wheel shaft and a pair of pulley on portal frame top, this pulley is installed in rotation on the wheel shaft, described conveying worm can be by the pivotally connection of rest pad on fulcrum and the conveyer support, one of described wire rope each is connected with one of suspension ring spare, the other end is walked around pulley and is connected to hoist engine, and this lifting gear is installed on the platform of ship by base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98224262 CN2337195Y (en) | 1998-06-11 | 1998-06-11 | Helical rimer type dredging apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98224262 CN2337195Y (en) | 1998-06-11 | 1998-06-11 | Helical rimer type dredging apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2337195Y true CN2337195Y (en) | 1999-09-08 |
Family
ID=33975172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98224262 Expired - Fee Related CN2337195Y (en) | 1998-06-11 | 1998-06-11 | Helical rimer type dredging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2337195Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507360A (en) * | 2016-02-03 | 2016-04-20 | 厦门大学嘉庚学院 | Horizontal screw conveying silt cleaning equipment and method |
| CN106743280A (en) * | 2016-12-15 | 2017-05-31 | 长沙理工大学 | Guide rail type rotary classification stacking device of conveying system |
| CN110915769A (en) * | 2019-12-26 | 2020-03-27 | 柒小凤 | Soft-shelled turtle catching device |
-
1998
- 1998-06-11 CN CN 98224262 patent/CN2337195Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507360A (en) * | 2016-02-03 | 2016-04-20 | 厦门大学嘉庚学院 | Horizontal screw conveying silt cleaning equipment and method |
| CN105507360B (en) * | 2016-02-03 | 2019-05-03 | 厦门大学嘉庚学院 | A kind of horizontal spiral conveying mud cleaning equipment and its method for cleaning |
| CN106743280A (en) * | 2016-12-15 | 2017-05-31 | 长沙理工大学 | Guide rail type rotary classification stacking device of conveying system |
| CN110915769A (en) * | 2019-12-26 | 2020-03-27 | 柒小凤 | Soft-shelled turtle catching device |
| CN110915769B (en) * | 2019-12-26 | 2021-10-01 | 柒小凤 | Soft-shelled turtle catching device |
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| CF01 | Termination of patent right due to non-payment of annual fee |